Control system for gas fireplace

Abstract

Disclosed is a control system for a gas fireplace, including a housing, a direct push valve and a driving mechanism, where the direct push valve is disposed on the housing, and includes a valve body, and a push rod disposed along an axis of the valve body, the driving mechanism is disposed on the housing, and is capable of driving the push rod to do linear motion along the axis of the valve body, and the driving mechanism includes an operating rod doing linear motion along the housing, a first connecting rod hinged to a bottom end of the operating rod, a rotating rod hinged to the other end of the first connecting rod, a second connecting rod hinged to the other end of the rotating rod, and a jacking rod hinged to the other end of the second connecting rod. A rotating shaft is disposed on the housing, the rotating rod is capable of rotating around the rotating shaft, and the jacking rod is capable of doing linear motion along the axis of the valve body. When the operating rod does linear motion in a vertical direction of the housing, the jacking rod is pushed to do linear motion along the axis of the valve body. When the jacking rod does linear motion along the axis of the valve body, the push rod is pushed to do linear motion along the axis of the valve body.

Description

Technical Field

[0001] The present invention relates to the technical field of a gas fireplace, and particularly relates to a control system for a gas fireplace.Background

[0002] A gas fireplace is increasingly favored by consumers because of its ornamental effect of real flames and an excellent heating effect. As a decorative gas appliance, the gas fireplace typically require minimal exposed operating elements or concealed designs. However, control components such as a valve are generally disposed at the bottom of a product, which results in results in long distance between the operating elements and the valve for controlling the gas supply. In this case, a set of proper motion mechanism is needed for transferring the motion from the operating elements to the valve to control the opening and closing of the valve. This set of motion mechanism, as well as the valve, relevant ignition, shut-off and detection devices, etc. jointly form a control system for the gas fireplace.

[0003] There are two major types of gas valves: a rotary plug valve and a direct push valve in the market at present. The rotary plug valve needs pressing motion and rotation motion during operation, resulting in complicated motion transfer. Therefore, it is difficult to transfer the motion for a long distance. In contrast, the direct push valve does linear motion, is simple in motion, and is simple and convenient to operate, so it is suitable for occasions where long-distance motion transfer control is required in the gas fireplace.

[0004] However, for a control system for a gas fireplace adapted to a direct push valve on the market, when a terminal component of a motion mechanism pushes the direct push valve, there is certain relative sliding between the terminal component and a push rod of the direct push valve. As disclosed in patent CN201320715287.7, a gas appliance push rod valve adjusting mechanism, the relative sliding may increase the wear on the push rod of the direct push valve and influence the stroke control, and the relative sliding may increase lateral force acting on the push rod of the direct push valve, causing the push rod of the direct push valve to deflect, and further causing the hidden danger of jamming of the push rod of the direct push valve.Summary 1. Technical problem to be solved

[0005] The present invention aims at solving the technical problem to provide a control system for a gas fireplace capable of conveniently realizing two working states: a high-level working state and a low-level working state of the gas fireplace, and capable of reducing wear on a push rod of a direct push valve and prolonging the service life of the direct push valve.2. Technical solution

[0006] In order to solve the technical problem, the solution used in the present invention is a control system for a gas fireplace, including: a housing; a direct push valve, disposed on the housing and including a valve body and a push rod disposed along an axis of the valve body; and a driving mechanism, disposed on the housing and being capable of driving the push rod to do linear motion along the axis of the valve body.

[0007] The driving mechanism includes an operating rod doing linear motion along the housing, a first connecting rod hinged to a bottom end of the operating rod, a rotating rod hinged to the other end of the first connecting rod, a second connecting rod hinged to the other end of the rotating rod, and a jacking rod hinged to the other end of the second connecting rod, a rotating shaft is disposed on the housing, the rotating rod is capable of rotating around the rotating shaft, the jacking rod is capable of doing linear motion along the axis of the valve body, when the operating rod does linear motion in a first direction, the jacking rod is pushed to do linear motion along the axis of the valve body, and when the jacking rod does linear motion along the axis of the valve body, the push rod is pushed to do linear motion along the axis of the valve body.

[0008] In some embodiments, a motion direction of the operating rod is perpendicular to a motion direction of the jacking rod, and the motion direction of the jacking rod is the same as a motion direction of the push rod.

[0009] Specifically, a rotating connection position of the rotating rod and the housing is close to one end of the jacking rod relative to a hinging position of the first connecting rod and the rotating rod. Therefore, after the operating rod moves downward, an end of the first connecting rod hinged to the operating rod moves downward, and the hinging position of the first connecting rod and the rotating rod is pushed to move in a direction approaching to the jacking rod. The rotating rod and the housing are rotatably connected, so the hinging position of the rotating rod and the first connecting rod is pushed to move in a direction approaching to the jacking rod. The jacking rod is limited to move in a direction along the axis of the valve body, so the first connecting rod pushes the jacking rod to move in a direction approaching to the push rod, and thus the push rod is pushed to move along the axis of the valve body in a direction approaching to the valve body. Similarly, after the operating rod moves upward, through the first connecting rod, the rotating rod and the second connecting rod, the jacking rod is driven to move along the axis of the valve body in a direction leaving far away from the push rod, and be disconnected from the push rod, and the push rod is reset under the action of a first reset spring.

[0010] By adopting the above solution, the rotating shaft is disposed on the housing, the rotating rod is rotatably connected with the rotating shaft, and rotatable around the rotating shaft. In addition, since the operating rod, the first connecting rod and the rotating rod are all rotatably connected, and the rotating rod, the second connecting rod and the jacking rod are also all rotatably connected, the housing, the operating rod, the first connecting rod and the rotating rod form a slider-crank mechanism, and the housing, the rotating rod, the second connecting rod and the jacking rod form a crank-slider mechanism. The rotating rod is driven to do rotational motion through the linear motion of the operating rod, so that the jacking rod can be driven to do linear motion, that is, the motion of the operating rod is transferred to the jacking rod. The jacking rod drives the push rod of the direct push valve to move in a direction approaching to the valve body under the driving force of the operating rod.

[0011] In some embodiments, the driving mechanism further includes a guide post and a fixing seat that are fixedly disposed on the housing, the guide post is disposed in a motion stroke of the operating rod, the operating rod is provided, in the motion direction, with a guide groove fit with the guide post, the fixing seat is provided with a first through hole in the axis direction of the valve body, the jacking rod is fit in the first through hole, and the jacking rod is capable of doing linear motion along the first through hole.

[0012] In some embodiments, each of an upper end and a lower end of the operating rod is provided with the guide groove, the housing is provided with two guide posts which are respectively fit with the two guide grooves, so that the linear motion of the operating rod is more stable, and deflection is avoided. Further, the motion stability of the driving mechanism is ensured, and the stability of the linear motion of the jacking rod and the push rod is ensured.

[0013] By adopting the above solution, through the fit between the guide posts and the guide grooves, the linear motion of the operating rod on the housing can be limited. Through the fit between the jacking rod and the first through hole, the linear motion of the jacking rod on the housing can be limited.

[0014] In some embodiments, the direct push valve has a low-level state and a high-level state for the gas flow supplied to the gas fireplace. After the operating rod moves downward, the operating rod drives the jacking rod to approach to the push rod along the axis of the valve body, and pushes the push rod to move to the low-level position along the axis of the valve body in a direction approaching to the valve body, and at this moment, the direct push valve is in the low-level state for the gas flow supplied to the gas fireplace. After the operating rod moves upward, the operating rod drives the jacking rod to leave far away from the push rod along the axis of the valve body, the push rod returns to the high-level position along the axis of the valve body in a direction leaving far away from the valve body, and at this moment the direct push valve is in the high-level state for the gas flow supplied to the gas fireplace.

[0015] In some embodiments, an operating handle is disposed on the operating rod, and the operating handle extends out of the housing and is convenient for a user to operate.

[0016] By adopting the above solution, through the motion of the operating rod, the two working states: the low-level state and the high-level state of the direct push valve for the gas flow supplied to the gas fireplace can be realized, and the operation by the user is convenient.

[0017] In some embodiments, a low-level buffer positioning device is disposed between the operating rod and the housing, and when the operating rod moves downward until the direct push valve is in the low-level state, the operating rod is just in contact with the low-level buffer positioning device.

[0018] Specifically, the operating rod has a low-level position and an ignition position. When the operating rod moves to the low-level position, the direct push valve is in the low-level state. When the operating rod moves to the ignition position, the direct push valve is in an ignition state.

[0019] In some embodiments, when the operating rod continuously moves downward to the ignition position, the operating rod can compress the low-level buffer positioning device. In addition, when the operating rod is in a position between the low-level position and the ignition position, the operating rod can automatically return to the low-level position under the action of the low-level buffer positioning device upon removal of an acting force applied to the operating rod.

[0020] In some embodiments, the low-level buffer positioning device includes a low-level buffer fixing block, a low-level buffer sliding rod, and a low-level buffer spring, the low-level buffer fixing block is fixedly disposed relative to the housing, and the low-level buffer fixing block is provided with a second through hole in a motion direction of the operating rod; the low-level buffer sliding rod is fit in the second through hole, and the low-level buffer sliding rod is capable of doing linear motion along the second through hole; and the operating rod is disposed at a top end of the low-level buffer sliding rod, and when the operating rod moves downward to contact with the top end of the low-level buffer sliding rod, the direct push valve is in the low-level position.

[0021] In addition, an end of the low-level buffer sliding rod far away from the operating rod is provided with a stop baffle block capable of abutting against a bottom end of the low-level buffer fixing block, an end of the low-level buffer sliding rod adjacent to the operating rod is provided with a low-level buffer spring baffle sheet, the low-level buffer spring sleeves the low-level buffer sliding rod, with one end being abutted against the low-level buffer spring baffle sheet, and the other end being abutted against a top end of the low-level buffer fixing block, and the low-level buffer spring is capable of providing the low-level buffer sliding rod with a tendency to always move in a direction approaching to the operating rod.

[0022] In some embodiments, an end of the operating rod adjacent to the low-level buffer sliding rod is provided with a low-level buffer operating arm, and an end of the low-level buffer sliding rod adjacent to the operating rod is provided with a ball head; and when the operating rod moves downward until the direct push valve is in the low-level position, the low-level buffer operating arm is in contact with the ball head.

[0023] By adopting the above solution, when the operating rod moves downward to the low-level position, the low-level buffer operating arm is just in contact with the low-level buffer operating arm, and at this moment, the direct push valve is in the low-level state. When the operating rod continuously moves downward to the ignition position, the low-level buffer operating arm pushes the low-level buffer sliding rod to move downward, the low-level buffer spring is compressed, and at this moment, the direct push valve is in the ignition state. When the operating rod is in a position between the low-level position and the ignition position, a resilience force of the low-level buffer spring applies an upward motion acting force to the low-level buffer operating arm upon removal of an acting force applied to the operating rod. Therefore, the operating rod returns to the low-level position. An end of the low-level buffer sliding rod in contact with the low-level buffer operating arm is configured as a ball head, so that the low-level buffer sliding rod and the low-level buffer operating arm are in point contact, resulting in smoother operation.

[0024] In some embodiments, a high-level buffer positioning device is disposed between the jacking rod and the fixing seat, and when the operating rod moves upward until the direct push valve is in the high-level state, the high-level buffer positioning device is just in contact with the fixing seat.

[0025] Specifically, the operating rod has a high-level position and a shut-off position. When the operating rod moves to the high-level position, the direct push valve is in the high-level state. When the operating rod moves to the shut-off position, the direct push valve is in the shut-off state.

[0026] In some embodiments, the high-level buffer positioning device includes a high-level buffer baffle sheet clamped on an end of the jacking rod adjacent to the push rod, a movable baffle sheet sleeving an end of the jacking rod adjacent to the fixing seat, and a high-level buffer spring sleeving the jacking rod; one end of the high-level buffer spring is abutted against the high-level buffer baffle sheet, and the other end is abutted against the movable baffle sheet; the operating rod moves upward and drives the jacking rod to move until the movable baffle sheet is in contact with the fixing seat, and at this moment, the direct push valve is in the high-level position; and the high-level buffer spring is capable of providing the jacking rod with a tendency to always move in a direction approaching to the push rod.

[0027] In some embodiments, an end of the jacking rod adjacent to the push rod is provided with a high-level buffer clamp groove, the high-level buffer baffle sheet is clamped into the high-level buffer clamp groove to further realize the fixed installation of the high-level buffer baffle sheet on the jacking rod. An end of the jacking rod adjacent to the fixing seat is provided with a stop step, and the movable baffle sheet is abutted against the stop step under a resilience force of the high-level buffer spring. The movable baffle sheet sleeves the jacking rod, so under the action of an external force, after the movable baffle sheet is abutted against an end of the fixing seat adjacent to the direct push valve, the movable baffle sheet is limited, and the high-level buffer spring is compressed.

[0028] By adopting the above solution, when the operating rod moves upward, the jacking rod is driven to move along the axis of the valve body in a direction leaving far away from the direct push valve until the operating rod reaches the high-level position, at this moment, the movable baffle sheet is just in contact with the fixing seat, and the direct push valve is in the high-level state. At this moment, if the operating rod continuously moves upward, since the fixing seat is fixed onto the housing, the movable baffle sheet is limited onto the fixing seat, then high-level buffer spring is compressed, at this moment, if an acting force applied to the operating rod is removed, the resilience force of the high-level buffer spring applies an acting force to the high-level buffer baffle sheet, so that the jacking rod is driven to move in a direction approaching to the push rod, and the jacking rod drives the operating rod to return to the high-level position. i.e., the position where the operating rod is positioned when the movable baffle sheet is just in contact with the fixing seat.

[0029] In some embodiments, a motion distance of the operating rod is greater than a motion distance of the jacking rod to realize the motion displacement reduction function of the driving mechanism. Therefore, the position of each level can be more clearly distinguished when the operating rod is operated to move.

[0030] In some embodiments, the direct push valve includes: a valve body, internally provided with a gas inlet cavity, a transition cavity and a gas outlet cavity in sequential connection, and including a gas inlet communicating with the gas inlet cavity, and a gas outlet communicating with the gas outlet cavity; a push rod, disposed in the gas outlet cavity, and being capable of doing linear motion in an axial direction of the gas outlet cavity; a middle sealing body, sleeving an end of the push rod adjacent to the gas inlet cavity; a first reset spring, sleeving the push rod and positioned between the middle sealing body and a tail portion of the push rod, an end of the push rod adjacent to the jacking rod forming the tail portion of the push rod, and the first reset spring being capable of providing the push rod with a tendency to always move in a direction leaving far away from the gas outlet cavity; and an electromagnetic valve, disposed at an end of the valve body adjacent to the gas inlet cavity, and including a valve core capable of doing linear motion along an axial direction of the gas inlet cavity, and a sealing block connected onto an end of the valve core adjacent to the gas outlet cavity, and the sealing block being capable of separating the gas inlet cavity from the transition cavity.

[0031] The valve body is internally provided with a first sealing ring capable of forming fit sealing with the push rod, and the first sealing ring is capable of separating the transition cavity from the gas outlet cavity; the valve body is internally provided with a low-level gas path passage capable of communicating the transition cavity with the gas outlet, a low-level adjusting rod is disposed in the low-level gas path passage, and a circulation gap is formed between the low-level adjusting rod and an inner wall of the low-level gas path passage; and the low-level adjusting rod is movably disposed in the low-level gas path passage to adjust the size of the circulation gap.

[0032] Specifically, the first sealing ring is disposed between the transition cavity and the gas outlet cavity, and through the fit sealing of the push rod and the first sealing ring, a gas flow entering from the gas inlet cavity can only flow to the gas outlet from the low-level gas path passage. When the sealing of the push rod and the first sealing ring is removed, the gas flow entering from the gas inlet cavity can respectively flow to the gas outlet from the low-level gas path passage, and flow to the gas outlet from the gas outlet cavity. With these two paths for leading out the gas flow, a high-fire state can be achieved.

[0033] In some embodiments, a second reset spring is disposed between the valve core and the sealing block, and the second reset spring can provide the valve core with a tendency to always move in a direction approaching to the transition cavity.

[0034] By adopting the above solution, through the arrangement of the low-level gas path passage, a low-level working state can be realized. Through the arrangement of the low-level adjusting rod in the low-level gas path passage, the low-level adjusting rod can be adjusted according to requirements, so that the size of the circulation gap between the low-level adjusting rod and the inner wall of the low-level gas path passage can be adjusted, and further the flow rate flowing to the gas outlet can be further adjusted.

[0035] In some embodiments, the low-level gas path passage includes a low-level gas inlet passage communicating with the transition cavity and a low-level gas outlet passage communicating with the gas outlet, and the low-level gas inlet passage intersects with the low-level gas outlet passage; and the low-level gas inlet passage or the low-level gas outlet passage axially extends to form a low-level adjusting opening, and the low-level adjusting rod is disposed in the low-level adjusting opening, and is capable of doing linear motion in an axial direction of the low-level adjusting opening.

[0036] The low-level adjusting rod includes a first shaft portion and a second shaft portion in sequential connection in the axial direction of the low-level adjusting opening, a shaft diameter of the first shaft portion is smaller than a shaft diameter of the second shaft portion, a transition shaft portion is formed between the first shaft portion and the second shaft portion, the first shaft portion is capable of extending into the low-level gas inlet passage or the low-level gas outlet passage, and the circulation gap is formed between the transition shaft portion and an inner wall of the low-level gas path passage; an outer surface of the transition shaft portion is a transition curve connected with outer surfaces of the first shaft portion and the second shaft portion, so when the low-level adjusting rod moves along the axial direction of the low-level adjusting opening in a direction leaving far away from the low-level gas inlet passage or the low-level gas outlet passage, the size of the circulation gap increases; and when the low-level adjusting rod moves along the axial direction of the low-level adjusting opening in a direction approaching to the low-level gas inlet passage or the low-level gas outlet passage, the size of the circulation gap decreases.

[0037] In some embodiments, the low-level gas inlet passage is perpendicular to the low-level gas outlet passage.

[0038] By adopting the above solution, in a process that the low-level adjusting rod does linear motion in the axial direction of the low-level adjusting opening, the size of the circulation gap between the low-level adjusting rod and the inner wall of the low-level gas path passage can be adjusted, and further the flow rate flowing to the gas outlet can be adjusted.

[0039] In some embodiments, a second sealing ring is disposed between the low-level adjusting rod and the low-level adjusting opening, and the second sealing ring and the low-level adjusting opening are in interference fit, so the sealing between the second sealing ring and the low-level adjusting opening can be realized. The second sealing ring and the low-level adjusting rod are in interference fit, so the sealing between the second sealing ring and the low-level adjusting rod can be realized, and further the sealing between the low-level adjusting rod and the low-level adjusting opening can be ensured to prevent gas flow leakage, realizing high safety .

[0040] In some embodiments, the low-level adjusting rod and the low-level adjusting opening are in threaded connection. A tail end of the low-level adjusting rod is provided with a fit portion capable of being fit with an external structure, so that the low-level adjusting rod can do linear motion in the axial direction of the low-level adjusting opening, the fit portion includes structures such as a cross groove or a straight groove, and the low-level adjusting rod can be conveniently screwed in or screwed out with a common screwdriver, so that the effect of adjusting the size of the circulation gap formed between the low-level adjusting rod and the low-level gas path passage can be realized, and the operation is convenient.

[0041] In some embodiments, one of the low-level gas inlet passage and the low-level gas outlet passage extends axially to form the low-level adjusting opening; and the other one of the low-level gas inlet passage and the low-level gas outlet passage extends axially to from a process hole, and a plug is fit in the process hole.

[0042] In some embodiments, the plug includes a steel ball, the plug and the process hole are in interference fit, after the plug is assembled into the process hole, the process hole may be sealed, thereby ensuring good sealing performance of the low-level gas path passage.

[0043] By adopting the above solution, the low-level gas path passage is formed through machining. Due to the process manufacturing, a process hole is generally formed. In order to plug the process hole, the plug is used to plug the process hole to ensure the sealing performance of the low-level gas path passage.

[0044] In some embodiments, the valve body is further provided with a standing pilot gas outlet communicating with the transition cavity.

[0045] In some embodiments, a head portion of the push rod is provided with an inclined surface for guiding, so that the motion of the push rod is smoother. Particularly, when the push rod is fit to an inner hole of the first sealing ring, the inclined surface enables the push rod to smoothly enter the inner hole without scratching the inner hole of the first sealing ring. A tail portion of the push rod is of a round shaft structure, and an end of a tail portion of the push rod adjacent to the middle sealing body is provided with a notch, so as to release a gas pressure in a space formed between the tail portion of the push rod and the inner wall of the valve body.

[0046] By adopting the above solution, when the push rod does linear motion in the axial direction of the gas outlet cavity, the tail portion of the push rod cooperates with the inner wall of the valve body to move. The gap between the tail portion of the push rod and the inner wall of the valve body is very small, and in use, the application of lubricating grease forms a sealed state between the tail portion of the push rod and the inner wall of the valve body. Therefore, when the push rod does linear motion, the gas pressure in the space formed between the tail portion of the push rod and the inner wall of the valve body also changes. Due to the formation of the notch, the gas pressure in the space formed between the tail portion of the push rod and the inner wall of the valve body can be released, realizing high safety.

[0047] In some embodiments, the control system further includes a pilot burner device and an ignition / shut-off control device.

[0048] The pilot burner device includes an ignition nozzle, an ignition needle, and a thermocouple, the ignition nozzle is connected with a standing pilot gas outlet on the direct push valve, and the thermocouple is connected with the electromagnetic valve. The thermocouple generates thermoelectric potential under the effect of flames, and through the thermoelectric potential generated on the thermocouple, the electromagnetic valve keeps an attraction state.

[0049] The ignition / shut-off control device includes an ignition limit switch, a shut-off limit switch and an igniter, the ignition limit switch is disposed in a position where the operating rod moves downward to an ignition position and the driving mechanism is capable of touching the ignition limit switch, and the shut-off limit switch is disposed in a position where the operating rod moves upward to a shut-off position and the driving mechanism is capable of touching the shut-off limit switch; and the igniter is connected with the ignition needle, the ignition limit switch is connected in series with the igniter and the ignition needle, and the shut-off limit switch is connected in series with the electromagnetic valve and the thermocouple.

[0050] In some embodiments, an ignition switch operating arm is disposed on the jacking rod, and when the operating rod moves downward to the ignition position, the ignition switch operating arm is capable of touching the ignition limit switch.

[0051] In some embodiments, the ignition limit switch is relatively disposed above the jacking rod, an end of the jacking rod adjacent to the ignition limit switch is provided with an ignition switch operating arm. In addition, when the operating rod moves downward to the ignition position, the jacking rod moves in the direction approaching to the push rod until the ignition switch operating arm just triggers the ignition limit switch.

[0052] In some embodiments, a shut-off switch operating arm is disposed on the rotating rod, and when the operating rod moves upward to the shut-off position, the shut-off switch operating arm is capable of touching the shut-off limit switch.

[0053] In some embodiments, the shut-off switch operating arm is disposed above the rotating rod, and the shut-off limit switch is relatively disposed at an end of the rotating rod adjacent to the push rod. When the operating rod moves upward to the shut-off position, the rotating rod rotates around the rotating shaft, so that the shut-off switch operating arm relatively moves downward to just trigger the shut-off limit switch.Working principle of the present invention:

[0054] The driving mechanism is practically formed by a slider-crank mechanism and a crank-slider mechanism, the linear motion of the operating rod in a vertical direction is converted and transferred into the linear motion of the jacking rod in a horizontal direction, and the motion displacement distance is reduced to adapt to the stroke change of the push rod of the direct push valve. The jacking rod does the linear motion, and the axis of the push rod of the direct push valve keeps consistent with the motion direction of the jacking rod, so when pushing the push rod, the jacking rod linearly pushes the push rod, without relative displacement between the jacking rod and the push rod. As a result, the operation on the direct push valve is smoother, no abrasion is caused on the push rod, and the service life of the direct push valve is prolonged.

[0055] The direct push valve is a direct push valve with an adjustable low-level flow rate passage, which not only realizes the high-level and low-level gas supply states conveniently, but also allow the adjustment of the low-level flow rate to adapt to the requirements of the low-level flame sizes of different products.

[0056] Through the low-level buffer reset device and the high-level buffer reset device, the operating rod can automatically return to the low-level position or the high-level position, so the user can easily set the gas fireplace to the low-level position or the high-level position.

[0057] Ignition: when the user presses and operates the operating handle and fully presses the handle, the operating rod moves downward, the jacking rod moves in a direction towards the direct push valve until the push rod is pushed to move in a direction approaching to the gas inlet cavity, and the sealing block is pushed so that the electromagnetic valve is in an attraction position, the second reset spring is compressed, and the first reset spring is compressed; and at this moment, the gas inlet cavity communicates with the standing pilot gas outlet, the gas can enter the ignition nozzle of the pilot burner device through the gas inlet cavity of the direct push valve. In addition, at this moment, the ignition switch operating arm triggers the ignition limit switch to control the igniter to perform discharging ignition on the ignition needle. Moreover, in the ignition state, the low-level buffer spring is in a compressed state under the acting force of the operating rod.

[0058] Low level: after the flame is ignited, the user may release the acting force applied to the operating handle, the operating rod automatically moves upward under the resilience force of the low-level buffer spring, further driving the jacking rod to move in the direction leaving far away from the direct push valve; at this moment, under the resilience force of the first reset spring, the push rod moves in a direction leaving far away from the gas inlet cavity, until an outer circumference surface of the push rod near the head portion is about to be out of contact with the first sealing ring, the low-level buffer sliding rod and the low-level buffer operating arm are just in a disconnecting critical point, and at this moment, the outer circumference surface of the push rod near the head portion and the first sealing ring are in a sealed state. After entering the transition cavity, the gas of the gas inlet cavity may enter the gas outlet through the low-level gas path passage to burn in a gas fireplace burner, achieving the low-flow rate state; and the thermocouple generates thermoelectric potential under the action of the flame, and the generated thermoelectric potential can keep the electromagnetic valve to be in an attraction state.

[0059] High level: in the low-level state, the user operates the operating handle to lift the operating rod upward, the jacking rod is further driven to continue to move in a direction leaving far away from the direct push valve until the movable baffle sheet is just in contact with the fixing seat, reaching the high-level position, and at this moment, if the operating rod is continuously lifted upward, under the action of the high-level reset spring, the resistance is obviously increased to remind the user that the operating rod has been in the high-level position. Even if the user applies an excessive force, and the operating rod slightly exceeds the high-level position, the operating rod will return to the high-level position under the resilience force of the high-level reset spring as along as the acting force applied to the operating handle is removed. During the transition from the low-level position to the high-level position, under the action of the first reset spring, the push rod continues to move in a direction leaving far away from the gas inlet cavity, the outer circumference surface of the push rod near the head portion is out of contact with the first sealing ring, the transition cavity communicates with the gas outlet cavity, and the gas in the transition cavity can enter the gas outlet through the gas outlet cavity. In addition, a diameter of the gas path is greater than a diameter of the low-level gas path passage, a larger gas flow is formed to flow to the gas outlet, reaching the high-level flow rate state, and the flame of the gas fireplace is in a high-level size state.

[0060] Shut-off: in the high-level state, the user can continuously lift the operating rod upward to overcome the acting force of the high-level reset spring to reach the shut-off position, at this moment, the shut-off switch operating arm acts on the shut-off limit switch, disconnecting the thermocouple from the electromagnetic valve. As a result, the electromagnetic valve cannot receive the thermoelectric potential generated on the thermocouple, and then the electromagnetic valve cannot keep the attraction state. Under the action of the second reset spring, the sealing block seals and isolates the gas inlet cavity and the transition cavity, and the direct push valve is in a closed state, so the shut-off operation is realized.

[0061] Reset: in the shut-off state, when the acting force applied to the operating rod is removed, under the action of the high-level reset spring, the operating rod is driven by the jacking rod to return to the high-level position. However, at this moment, the direct push valve is in the closed state, so the gas fireplace is also in a shut-off state. That is, at this moment, the gas fireplace is in a standby reset state.3. Beneficial effects

[0062] Compared with the prior art, the present invention designs a control system for a gas fireplace. (1) The present invention converts and transfers the linear motion of the operating rod in the vertical direction into the linear motion of the jacking rod through the driving mechanism, and reduces the motion displacement distance to adapt to the stroke change of the push rod of the direct push valve. The jacking rod does linear motion, and the axis of the push rod of the direct push valve keeps consistent with the motion direction of the jacking rod, so when pushing the push rod, the jacking rod linearly pushes the push rod, without relative displacement between the jacking rod and the push rod. As a result, the operation on the direct push valve is smoother, no abrasion is caused on the push rod, and the service life of the direct push valve is prolonged. (2) The direct push valve of the present invention is a direct push valve with an adjustable low-level flow rate passage, which not only realizes the high-level and low-level gas supply states conveniently, but also allow the adjustment of the low-level flow rate to adapt to the requirements of the low-level flame sizes of different products. (3) Through the arrangement of the low-level buffer reset device and the high-level buffer reset device, the operating rod can automatically return to the low-level position or the high-level position, the user can easily set the gas fireplace to the low-level position or the high-level position, the structure is simple, and the operation is convenient. Brief Description of Figures

[0063] To describe the technical solutions of the embodiments of the present invention more clearly, the following briefly introduces the accompanying drawings required for describing the embodiments. Apparently, the accompanying drawings in the following description show only some embodiments of the present invention, and a person of ordinary skill in the art may still derive other drawings from these accompanying drawings without creative efforts. FIG. 1 is a schematic structural diagram of a control system for a gas fireplace according to the present invention. FIG. 2 is a cross-sectional view of a direct push valve according to the present invention. FIG. 3 is a schematic structural diagram of a control system for a gas fireplace from another angle according to the present invention. FIG. 4 is a partial enlarged view of a control system for a gas fireplace according to the present invention. FIG. 5 is a schematic structural diagram of a control system for a gas fireplace in an ignition state according to the present invention. FIG. 6 is a cross-sectional view of a direct push valve in an ignition state according to the present invention. FIG. 7 is an enlarged view of a portion A in FIG. 6. FIG. 8 is a schematic structural diagram of a control system for a gas fireplace in a low-level state according to the present invention. FIG. 9 is a partial cross-sectional view of a portion B-B in FIG. 8. FIG. 10 is a cross-sectional view of a direct push valve in a low-level state according to the present invention. FIG. 11 is a schematic structural diagram of a control system for a gas fireplace in a high-level state according to the present invention. FIG. 12 is a partial cross-sectional view of a portion C-C in FIG. 11. FIG. 13 is a cross-sectional view of a direct push valve in a high-level state according to the present invention. FIG. 14 is a schematic structural diagram of a control system for a gas fireplace in a shut-off state according to the present invention. FIG. 15 is a cross-sectional view of a direct push valve in a closed state according to the present invention.

[0064] In the figures, 100 denotes a housing, 103 denotes a rotating shaft, 200 denotes a direct push valve, 201 denotes a valve body, 2011 denotes a gas inlet cavity, 2012 denotes a transition cavity, 2013 denotes a gas outlet cavity, 2014 denotes a gas inlet, 2015 denotes a gas outlet, 2016 denotes a low-level gas path passage, 2016a denotes a low-level gas inlet passage, 2016b denotes a low-level gas outlet passage, 2017 denotes a low-level adjusting opening, 2018 denotes a process hole, 2019 denotes a standing pilot gas outlet, 202 denotes a push rod, 2021 denotes an inclined surface, 2022 denotes a notch, 203 denotes a middle sealing body, 204 denotes a first reset spring, 205 denotes an electromagnetic valve, 2051 denotes a valve core, 2052 denotes a sealing block, 2053 denotes a second reset spring, 206 denotes a first sealing ring, 207 denotes a low-level adjusting rod, 2071 denotes a first shaft portion, 2072 denotes a second shaft portion, 2073 denotes a transition shaft portion, 2074 denotes a fit portion, 208 denotes a circulation gap, 209 denotes a second sealing ring, 210 denotes a plug, 300 denotes a driving mechanism, 301 denotes an operating rod, 3011 denotes a guide groove, 3012 denotes a low-level buffer operating arm, 3013 denotes an operating handle, 302 denotes a first connecting rod, 303 denotes a rotating rod, 3031 denotes a shut-off switch operating arm, 304 denotes a second connecting rod, 305 denotes a jacking rod, 3051 denotes an ignition switch operating arm, 3052 denotes a high-level buffer clamp groove, 3053 denotes a stop step, 306 denotes a guide post, 307 denotes a fixing seat, 3071 denotes a first through hole, 400 denotes a low-level buffer positioning device, 401 denotes a low-level buffer fixing block, 4011 denotes a second through hole, 402 denotes a low-level buffer sliding rod, 4021 denotes a stop baffle block, 4022 denotes a low-level buffer spring baffle sheet, 4023 denotes a ball head, 403 denotes a low-level buffer spring, 500 denotes a high-level buffer positioning device, 501 denotes a high-level buffer baffle sheet, 502 denotes a movable baffle sheet, 503 denotes a high-level buffer spring, 600 denotes a pilot burner device, 601 denotes an ignition nozzle, 602 denotes an ignition needle, 603 denotes a thermocouple, 700 denotes an ignition / shut-off control device, 701 denotes an ignition limit switch, 702 denotes a shut-off limit switch, and 703 denotes an igniter.Detailed Description

[0065] Specific implementations of the present invention will further be described below in combination with the drawings and embodiments in detail. The following embodiments are adopted to describe the present invention rather than limit the scope of the present invention.

[0066] In the description of the present invention, it should be noted that unless otherwise clearly defined and limited, terms "install", "interconnect" and "connect" should be understood in a broad sense, for example, it may be connected in a fixed, detachable or integrated manner; it may be mechanically or electrically connected; it may be directly connected or indirectly connected via an intermediate media; and it may be communication between two elements. For a person of ordinary skill in the art, the specific meanings of the above terms in the present invention may be understood according to specific conditions.

[0067] The implementations of the present invention will be described below with reference to specific examples. Those skilled in the art may easily understand other advantages and effects of the present invention by the contents disclosed in the present specification. It is clear that the described embodiments are a part of the embodiments of the present invention, rather than all the embodiments. The present invention may also be implemented or applied through other different specific implementations. Various modifications or changes may also be made to the details in the present specification without departing from the spirit of the present invention based on different viewpoints and applications. It should be noted that in the absence of conflicts, the following embodiments and features in the embodiments may be combined mutually. Based on the embodiments of the present invention, all other embodiments obtained by a person of ordinary skill in the art without any creative effort are within the protection scope of the present invention.

[0068] Specific details provided in the following descriptions are intended to provide convenience for thoroughly understanding the examples. However, those skilled in the art shall understand that they may do practices without these specific details.

[0069] It needs to be noted that FIG. 5 shows a structure of a control system for a gas fireplace in an ignition state according to the present invention, where an operating rod 301 is in an ignition position. FIG. 6 shows a structure of a direct push valve 200 in an ignition state according to the present invention, where a push rod 202 is in an ignition position. FIG. 8 shows a structure of a control system for a gas fireplace in a low-level state according to the present invention, where an operating rod 301 is in a low-level position. FIG. 10 shows a structure of a direct push valve 200 in a low-level state according to the present invention, where a push rod 202 is in a low-level position. FIG. 11 shows a structure of a control system for a gas fireplace in a high-level state according to the present invention, where an operating rod 301 is in a high-level position. FIG. 13 shows a structure of a direct push valve 200 in a high-level state according to the present invention, where a push rod 202 is in a high position. FIG. 14 shows a mechanism of a control system for a gas fireplace in a shut-off state according to the present invention, where an operating rod 301 is in a shut-off position. FIG. 15 shows a structure of a direct push valve in a shut-off state according to the present invention, where a push rod 202 is in a shut-off position.

[0070] The technical solution provided by each embodiment of the present invention will be described with reference to the accompanying drawings.

[0071] As shown in FIG. 1 to FIG. 15, the present invention provides a control system for a gas fireplace, including a housing 100, a direct push valve 200 disposed on the housing 100, and a driving mechanism 300. The direct push valve 200 includes a valve body 201, and a push rod 202 disposed along an axis of the valve body 201. The driving mechanism 300 is disposed on the housing 100, and is capable of driving the push rod 202 to do linear motion along the axis of the valve body 201, the driving mechanism 300 includes an operating rod 301 doing linear motion along the housing 100, a first connecting rod 302 hinged to a bottom end of the operating rod 301, a rotating rod 303 hinged to the other end of the first connecting rod 302, a second connecting rod 304 hinged to the other end of the rotating rod 303, and a jacking rod 305 hinged to the other end of the second connecting rod 304, a rotating shaft 103 is disposed on the housing 100, the rotating rod 303 is capable of rotating around the rotating shaft 103, the jacking rod 305 is disposed adjacent to the push rod 202, and the jacking rod 305 is disposed along the axis of the valve body 201, and is capable of doing linear motion along the axis of the valve body 201. When the operating rod 301 does linear motion in a vertical direction of the housing 100, the jacking rod 305 is pushed to do linear motion along the axis of the valve body 201. When the jacking rod 305 does linear motion along the axis of the valve body 201, the push rod 202 is pushed to do linear motion along the axis of the valve body 201. In addition, a motion direction of the operating rod 301 is perpendicular to a motion direction of the jacking rod 305, and the motion direction of the jacking rod 305 is the same as a motion direction of the push rod 202. Specifically, a rotating connection position of the rotating rod 303 and the housing 100 is close to one end of the jacking rod 305 relative to a hinging position of the first connecting rod 302 and the rotating rod 303. Therefore, after the operating rod 301 moves downward, the end of the first connecting rod 302 hinged to the operating rod 301 moves downward, and a hinging position of the first connecting rod 302 and the rotating rod 303 is pushed to move in a direction approaching to the jacking rod 305. The rotating rod 303 and the housing 100 are rotatably connected, so the hinging position of the rotating rod 303 and the first connecting rod 302 is pushed to move in a direction approaching to the jacking rod 305. The jacking rod 305 is limited to move in a direction along the axis of the valve body 201, so the first connecting rod 302 pushes the jacking rod 305 to move in a direction approaching to the push rod 202, and thus the push rod 202 is pushed to move along the axis of the valve body 201 in a direction approaching to the valve body 201. Similarly, after the operating rod 301 moves upward, through the first connecting rod 302, the rotating rod 303 and the second connecting rod 304, the jacking rod 305 is driven to move along the axis of the valve body 201 in a direction leaving far away from the push rod 202, and be disconnected from the push rod 202, and the push rod 202 is reset under the action of a first reset spring 204. By adopting the above solution, the rotating shaft 103 is disposed on the housing 100, the rotating rod 303 is rotatably connected with the rotating shaft 103, and rotatable around the rotating shaft 103. In addition, the operating rod 301, since the first connecting rod 302 and the rotating rod 303 are all rotatably connected, and the rotating rod 303, the second connecting rod 304 and the jacking rod 305 are all rotatably connected, the housing 100, the operating rod 301, the first connecting rod 302 and the rotating rod 303 form a slider-crank mechanism, and the housing 100, the rotating rod 303, the second connecting rod 304 and the jacking rod 305 form a crank-slider mechanism. The rotating rod 303 is driven to do rotational motion through the linear motion of the operating rod 301, so that the jacking rod 305 is driven to do linear motion, that is, the motion of the operating rod 301 is transferred to the jacking rod 305. The jacking rod 305 drives the push rod 202 of the direct push valve 200 to move in a direction approaching to the valve body 201 under the driving force of the operating rod 301. In some embodiments, the driving mechanism 300 further includes a guide post 306 and a fixing seat 307 that are fixedly disposed on the housing 100, the guide post 306 is disposed in a motion stroke of the operating rod 301, the operating rod 301 is provided, in the motion direction, with a guide groove 3011 fit with the guide post 306, the fixing seat 307 is provided with a first through hole 3071 in the axis direction of the valve body 201, the jacking rod 305 is fit in the first through hole 3071, and the jacking rod 305 is capable of doing linear motion along the first through hole 3071. In some embodiments, each of an upper end and a lower end of the operating rod 301 is provided with the guide groove 3011, the housing 100 is provided with two guide posts 306 which are respectively fit with the two guide grooves 3011, so that the linear motion of the operating rod 301 is more stable, and deflection is avoided. Further, the motion stability of the driving mechanism 300 is ensured, and the stability of the linear motion of the jacking rod 305 and the push rod 202 is ensured. By adopting the above solution, through the fit between the guide posts 306 and the guide grooves 3011, the linear motion of the operating rod 301 on the housing 100 can be limited. Through the fit between the jacking rod 305 and the first through hole 3071, the linear motion of the jacking rod 305 on the housing 100 can be limited.

[0072] In some embodiments, the direct push valve 200 has a low-level state and a high-level state for the gas flow supplied to the gas fireplace. After the operating rod 301 moves downward, the operating rod 301 drives the jacking rod 305 to approach to the push rod 202 along the axis of the valve body 201, and pushes the push rod 202 to move to the low-level position along the axis of the valve body 201 in a direction approaching to the valve body 201, and at this moment, the direct push valve 200 is in the low-level state for the gas flow supplied to the gas fireplace. After the operating rod 301 moves upward, the operating rod 301 drives the jacking rod 305 to leave far away from the push rod 202 along the axis of the valve body 201, the push rod 202 returns to the high-level position along the axis of the valve body 201 in a direction leaving far away from the valve body 201, and at this moment, the direct push valve 200 is in the high-level state for the gas flow supplied to the gas fireplace. In some embodiments, an operating handle 3013 is disposed on the operating rod 301, and the operating handle 3013 extends out of the housing 100 and is convenient for a user to operate. By adopting the above solution, through the motion of the operating rod 301, the two working states: the low-level state and the high-level state of the direct push valve 200 for the gas flow supplied to the gas fireplace can be realized, and the operation by the user is convenient.

[0073] In some embodiments, a low-level buffer positioning device 400 is disposed between the operating rod 301 and the housing 100, and when the operating rod 301 moves downward until the direct push valve 200 is in the low-level state, the operating rod 301 is just in contact with the low-level buffer positioning device 400. Specifically, the operating rod 301 has a low-level position and an ignition position. When the operating rod 301 moves to the low-level position, the direct push valve 200 is in the low-level state. When the operating rod 301 moves to the ignition position, the direct push valve 200 is in an ignition state. In some embodiments, when the operating rod 301 continuously moves downward to the ignition position, the operating rod 301 can compress the low-level buffer positioning device 400. In addition, when the operating rod 301 is in a position between the low-level position and the ignition position, the operating rod 301 can automatically return to the low-level position under the action of the low-level buffer positioning device 400 upon removal of an acting force applied to the operating rod 301. In some embodiments, the low-level buffer positioning device 400 includes a low-level buffer fixing block 401, a low-level buffer sliding rod 402, and a low-level buffer spring 403, the low-level buffer fixing block 401 is fixedly disposed relative to the housing 100, and the low-level buffer fixing block 401 is provided with a second through hole 4011 in a motion direction of the operating rod 301. The low-level buffer sliding rod 402 is fit in the second through hole 4011, and the low-level buffer sliding rod 402 is capable of doing linear motion along the second through hole 4011. The operating rod 301 is disposed at a top end of the low-level buffer sliding rod 402, and when the operating rod 301 moves downward to contact with the top end of the low-level buffer sliding rod 402, the direct push valve 200 is in the low-level position. An end of the low-level buffer sliding rod 402 far away from the operating rod 301 is provided with a stop baffle block 4021 capable of abutting against a bottom end of the low-level buffer fixing block 401, an end of the low-level buffer sliding rod 402 adjacent to the operating rod 301 is provided with a low-level buffer spring baffle sheet 4022, the low-level buffer spring 403 sleeves the low-level buffer sliding rod 402, with one end being abutted against the low-level buffer spring baffle sheet 4022, and the other end being abutted against a top end of the low-level buffer fixing block 401, and the low-level buffer spring 403 is capable of providing the low-level buffer sliding rod 402 with a tendency to always move in a direction approaching to the operating rod 301. In some embodiments, an end of the operating rod 301 adjacent to the low-level buffer sliding rod 402 is provided with a low-level buffer operating arm 3012, and an end of the low-level buffer sliding rod 402 adjacent to the operating rod 301 is provided with a ball head 4023. When the operating rod 301 moves downward until the direct push valve 200 is in the low-level position, the low-level buffer operating arm 3012 is in contact with the ball head 4023. By adopting the above solution, when the operating rod 301 moves downward to the low-level position, the low-level buffer operating arm 3012 is just in contact with the low-level buffer operating arm 3012, and at this moment, the direct push valve 200 is in the low-level state. When the operating rod 301 continuously moves downward to the ignition position, the low-level buffer operating arm 3012 pushes the low-level buffer sliding rod 402 to move downward, the low-level buffer spring 403 is compressed, and at this moment, the direct push valve 200 is in the ignition state. When the operating rod 301 is in a position between the low-level position and the ignition position, a resilience force of the low-level buffer spring 403 applies an upward motion acting force to the low-level buffer operating arm 3012 upon removal of an acting force applied to the operating rod 301. Therefore, the operating rod 301 returns to the low-level position. An end of the low-level buffer sliding rod 402 in contact with the low-level buffer operating arm 3012 is configured as a ball head 4023, so that the low-level buffer sliding rod 402 and the low-level buffer operating arm 3012 are in point contact, resulting in smoother operation.

[0074] In some embodiments, a high-level buffer positioning device 500 is disposed between the jacking rod 305 and the fixing seat 307, and when the operating rod 301 moves upward until the direct push valve 200 is in the high-level state, the high-level buffer positioning device 500 is just in contact with the fixing seat 307. Specifically, the operating rod 301 has a high-level position and a shut-off position. When the operating rod 301 moves to the high-level position, the direct push valve 200 is in the high-level state. When the operating rod 301 moves to the shut-off position, the direct push valve 200 is in the shut-off state. In some embodiments, the high-level buffer positioning device 500 includes a high-level buffer baffle sheet 501 clamped on an end of the jacking rod 305 adjacent to the push rod 202, a movable baffle sheet 502 sleeving an end of the jacking rod 305 adjacent to the fixing seat 307, and a high-level buffer spring 503 sleeving the jacking rod 305. One end of the high-level buffer spring 503 is abutted against the high-level buffer baffle sheet 501, and the other end is abutted against the movable baffle sheet 502. The operating rod 301 moves upward and drives the jacking rod 305 to move until the movable baffle sheet 502 is in contact with the fixing seat 307, and at this time, the direct push valve 200 is in the high-level position. The high-level buffer spring 503 is capable of providing the jacking rod 305 with a tendency to always move in a direction approaching to the push rod 202. In some embodiments, an end of the jacking rod 305 adjacent to the push rod 202 is provided with a high-level buffer clamp groove 3052, the high-level buffer baffle sheet 501 is clamped into the high-level buffer clamp groove 3052 to further realize the fixed installation of the high-level buffer baffle sheet 501 on the jacking rod 305. An end of the jacking rod 305 adjacent to the fixing seat 307 is provided with a stop step 3053, and the movable baffle sheet 502 is abutted against the stop step 3053 under a resilience force of the high-level buffer spring 503. The movable baffle sheet 502 sleeves the jacking rod 305, so under the action of external force, after the movable baffle sheet 502 is abutted against an end of the fixing seat 307 adjacent to the direct push valve 200, the movable baffle sheet 502 is limited, and the high-level buffer spring 503 is compressed. By adopting the above solution, when the operating rod 301 moves upward, the jacking rod 305 is driven to move along the axis of the valve body 201 in a direction leaving far away from the direct push valve 200 until the operating rod 301 reaches the high-level position, at this moment, the movable baffle sheet 502 is just in contact with the fixing seat 307, and the direct push valve 200 is in the high-level state. At this moment, if the operating rod 301 continuously moves upwards, since the fixing seat 307 is fixed onto the housing 100, the movable baffle sheet 502 is limited onto the fixing seat 307, then the high-level buffer spring 503 is compressed, at this moment, if an acting force applied to the operating rod 301 is removed, the resilience force of the high-level buffer spring 503 applies an acting force to the high-level buffer baffle sheet 501, so that the jacking rod 305 is driven to move in a direction approaching to the push rod 202, and the jacking rod 305 drives the operating rod 301 to return to the high-level position. i.e., the position where the operating rod 301 is positioned when the movable baffle sheet 502 is just in contact with the fixing seat 307.

[0075] In some embodiments, a motion distance of the operating rod 301 is greater than a motion distance of the jacking rod 305 to realize the motion displacement reduction function of the driving mechanism 300. Therefore, the position of each level can be more clearly distinguished when the operating rod 301 is operated to move.

[0076] In some embodiments, the direct push valve 200 includes a valve body 201, internally provided with a gas inlet cavity 2011, a transition cavity 2012 and a gas outlet cavity 2013 in sequential connection, and including a gas inlet 2014 communicating with the gas inlet cavity 2011, and a gas outlet 2015 communicating with the gas outlet cavity 2013; a push rod 202, disposed in the gas outlet cavity 2013, and being capable of doing linear motion in an axial direction of the gas outlet cavity 2013; a middle sealing body 203, sleeving an end of the push rod 202 adjacent to the gas inlet cavity 2011; a first reset spring 204, sleeving the push rod 202 and positioned between the middle sealing body 203 and a tail portion of the push rod 202, an end of the push rod 202 adjacent to the jacking rod 305 forming the tail portion of the push rod 202, and the first reset spring 204 being capable of providing the push rod 202 with a tendency to always move in a direction leaving far away from the gas outlet cavity 2013; and an electromagnetic valve 205, disposed at an end of the valve body 201 adjacent to the gas inlet cavity 2011. The electromagnetic valve 205 includes a valve core 2051 capable of doing linear motion along an axial direction of the gas inlet cavity 2011, and a sealing block 2052 connected onto an end of the valve core 2051 adjacent to the gas outlet cavity 2013, and the sealing block 2052 is capable of separating the gas inlet cavity 2011 from the transition cavity 2012. The valve body 201 is internally provided with a first sealing ring 206 capable of forming fit sealing with the push rod 202, and the first sealing ring 206 is capable of separating the transition cavity 2012 from the gas outlet cavity 2013. The valve body 201 is internally provided with a low-level gas path passage 2016 capable of communicating the transition cavity 2012 with the gas outlet 2015, a low-level adjusting rod 207 is disposed in the low-level gas path passage 2016, and a circulation gap 208 is formed between the low-level adjusting rod 207 and an inner wall of the low-level gas path passage 2016. The low-level adjusting rod 207 is movably disposed in the low-level gas path passage 2016 to adjust the size of the circulation gap 208. Specifically, the first sealing ring 206 is disposed between the transition cavity 2012 and the gas outlet cavity 2013, and through the fit sealing of the push rod 202 and the first sealing ring 206, a gas flow entering from the gas inlet cavity 2011 can only flow to the gas outlet 2015 from the low-level gas path passage 2016. When the sealing of the push rod 202 and the first sealing ring 206 is removed, the gas flow entering from the gas inlet cavity 2011 can respectively flow to the gas outlet 2015 from the low-level gas path passage 2016, and flow to the gas outlet 2015 from the gas outlet cavity 2013. With these two paths for leading out the gas flow, a high-fire state can be achieved. In some embodiments, a second reset spring 2053 is disposed between the valve core 2051 and the sealing block 2052, and the second reset spring 2053 can provide the valve core 2051 with a tendency to always move in a direction approaching to the transition cavity 2012. By adopting the above solution, through the arrangement of the low-level gas path passage 2016, a low-level working state can be realized. Through the arrangement of the low-level adjusting rod 207 in the low-level gas path passage 2016, the low-level adjusting rod 207 can be adjusted according to requirements, so that the size of the circulation gap 208 between the low-level adjusting rod 207 and the inner wall of the low-level gas path passage 2016 can be adjusted, and further the flow rate flowing to the gas outlet 2015 can be adjusted.

[0077] In some embodiments, the valve body 201 is further provided with a standing pilot gas outlet 2019 communicating with the transition cavity 2012.

[0078] In some embodiments, the low-level gas path passage 2016 includes a low-level gas inlet passage 2016a communicating with the transition cavity 2012 and a low-level gas outlet passage 2016b communicating with the gas outlet 2015, and the low-level gas inlet passage 2016a intersects with the low-level gas outlet passage 2016b. The low-level gas inlet passage 2016a or the low-level gas outlet passage 2016b axially extends to form a low-level adjusting opening 2017, and the low-level adjusting rod 207 is disposed in the low-level adjusting opening 2017, and is capable of doing linear motion in an axial direction of the low-level adjusting opening 2017. The low-level adjusting rod 207 includes a first shaft portion 2071 and a second shaft portion 2072 in sequential connection in the axial direction of the low-level adjusting opening 2017, a shaft diameter of the first shaft portion 2071 is smaller than a shaft diameter of the second shaft portion 2072, a transition shaft portion 2073 is formed between the first shaft portion 2071 and the second shaft portion 2072, the first shaft portion 2071 is capable of extending into the low-level gas inlet passage 2016a or the low-level gas outlet passage 2016b, and the circulation gap 208 is formed between the transition shaft portion 2073 and an inner wall of the low-level gas path passage 2016. An outer surface of the transition shaft portion 2073 is a transition curve connected with outer surfaces of the first shaft portion 2071 and the second shaft portion 2072, so when the low-level adjusting rod 207 moves along the axial direction of the low-level adjusting opening 2017 in a direction leaving far away from the low-level gas inlet passage 2016a or the low-level gas outlet passage 2016b, the size of the circulation gap 208 increases. When the low-level adjusting rod 207 moves along the axial direction of the low-level adjusting opening 2017 in a direction approaching to the low-level gas inlet passage 2016a or the low-level gas outlet passage 2016b, the size of the circulation gap 208 decreases. In some embodiments, the low-level gas inlet passage 2016a is perpendicular to the low-level gas outlet passage 2016b. By adopting the above solution, in a process that the low-level adjusting rod 207 does linear motion in the axial direction of the low-level adjusting opening 2017, the size of the circulation gap 208 between the low-level adjusting rod 207 and the inner wall of the low-level gas path passage 2016 can be adjusted, and further the flow rate flowing to the gas outlet 2015 can be adjusted.

[0079] In some embodiments, a second sealing ring 209 is disposed between the low-level adjusting rod 207 and the low-level adjusting opening 2017, and the second sealing ring 209 and the low-level adjusting opening 2017 are in interference fit, so the sealing between the second sealing ring 209 and the low-level adjusting opening 2017 can be realized. The second sealing ring 209 and the low-level adjusting rod 207 are in interference fit, so the sealing between the second sealing ring 209 and the low-level adjusting rod 207 can be realized, and further the sealing between the low-level adjusting rod 207 and the low-level adjusting opening 2017 can be ensured to prevent gas flow leakage, realizing high safety. In some embodiments, the low-level adjusting rod 207 and the low-level adjusting opening 2017 are in threaded connection. A tail end of the low-level adjusting rod 207 is provided with a fit portion 2074 capable of being fit with an external structure, so that the low-level adjusting rod 207 can do linear motion in the axial direction of the low-level adjusting opening 2017, the fit portion 2074 includes structures such as a cross groove or a straight groove, and the low-level adjusting rod 207 can be conveniently screwed in or screwed out with a common screwdriver, so that the effect of adjusting the size of the circulation gap 208 formed between the low-level adjusting rod 207 and the low-level gas path passage 2016 can be realized, and the operation is convenient.

[0080] In some embodiments, the low-level gas outlet passage 2016b extends axially to form the low-level adjusting opening 2017. The low-level gas inlet passage 2016a extends axially to from a process hole 2018, and a plug 210 is fit in the process hole 2018. In some embodiments, the plug 210 includes a steel ball, the plug 210 and the process hole 2018 are in interference fit, after the plug 210 is assembled into the process hole 2018, the process hole 2018 may be sealed, thereby ensuring good sealing performance of the low-level gas path passage 2016. By adopting the above solution, the low-level gas path passage 2016 is formed through machining. Due to the process manufacturing, a process hole 2018 is generally formed. In order to plug the process hole 2018, the plug 210 is used to plug the process hole 2018 to ensure the sealing performance of the low-level gas path passage 2016.

[0081] In some embodiments, a head portion of the push rod 202 is provided with an inclined surface 2021 for guiding, so that the motion of the push rod 202 is smoother. Particularly, when the push rod 202 is fit to an inner hole of the first sealing ring 206, the inclined surface 2021 enables the push rod 202 to smoothly enter the inner hole without scratching the inner hole of the first sealing ring 206. A tail portion of the push rod 202 is of a round shaft structure, and an end of a tail portion of the push rod 202 adjacent to the middle sealing body 203 is provided with a notch 2022, so as to release a gas pressure in a space formed between the tail portion of the push rod 202 and the inner wall of the valve body 201. By adopting the above solution, when the push rod 202 does linear motion in the axial direction of the gas outlet cavity 2013, the tail portion of the push rod 202 cooperates with the inner wall of the valve body 201 to move. The gap between the tail portion of the push rod 202 and the inner wall of the valve body 201 is very small, and in use, the application of lubricating grease forms a sealed state between the tail portion of the push rod 202 and the inner wall of the valve body 201. Therefore, when the push rod 202 does linear motion, the gas pressure in the space formed between the tail portion of the push rod 202 and the inner wall of the valve body 201 also changes. Due to the formation of the notch 2022, the gas pressure in the space formed between the tail portion of the push rod 202 and the inner wall of the valve body 201 can be released, realizing high safety.

[0082] In some embodiments, the control system further includes a pilot burner device 600 and an ignition / shut-off control device 700, the pilot burner device 600 includes an ignition nozzle 601, an ignition needle 602, and a thermocouple 603, the ignition nozzle 601 is connected with a standing pilot gas outlet 2019 on the direct push valve 200, and the thermocouple 603 is connected with the electromagnetic valve 205. The thermocouple 603 generates thermoelectric potential under the effect of flames, and through the thermoelectric potential generated on the thermocouple 603, the electromagnetic valve 205 keeps an attraction state. The ignition / shut-off control device 700 includes an ignition limit switch 701, a shut-off limit switch 702 and an igniter 703, the ignition limit switch 701 is disposed in a position where the operating rod 301 moves downward to an ignition position and the driving mechanism 300 is capable of touching the ignition limit switch 701, and the shut-off limit switch 702 is disposed in a position where the operating rod 301 moves upward to a shut-off position and the driving mechanism 300 is capable of touching the shut-off limit switch 702. The igniter 703 is connected with the ignition needle 602, the ignition limit switch 701 is connected in series with the igniter 703 and the ignition needle 602, and the shut-off limit switch 702 is connected in series with the electromagnetic valve 205 and the thermocouple 603. In some embodiments, an ignition switch operating arm 3051 is disposed on the jacking rod 305, and when the operating rod 301 moves downward to the ignition position, the ignition switch operating arm 3051 is capable of touching the ignition limit switch 701. In some embodiments, the ignition limit switch 701 is relatively disposed above the jacking rod 305, an end of the jacking rod 305 adjacent to the ignition limit switch 701 is provided with an ignition switch operating arm 3051. In addition, when the operating rod 301 moves downward to the ignition position, the jacking rod 305 moves in the direction approaching to the push rod 202 until the ignition switch operating arm 3051 just triggers the ignition limit switch 701. In some embodiments, a shut-off switch operating arm 3031 is disposed on the rotating rod 303, and when the operating rod 301 moves upward to the shut-off position, the shut-off switch operating arm 3031 is capable of touching the shut-off limit switch 702. In some embodiments, the shut-off switch operating arm 3031 is disposed above the rotating rod 303, and the shut-off limit switch 702 is relatively disposed at an end of the rotating rod 303 adjacent to the push rod 202. When the operating rod 301 moves upward to the shut-off position, the rotating rod 303 rotates around the rotating shaft 103, so that the shut-off switch operating arm 3031 relatively moves downward to just trigger the shut-off limit switch 702.Working principle of the present invention:

[0083] The driving mechanism 300 is practically formed by a slider-crank mechanism and a crank-slider mechanism, the linear motion of the operating rod 301 in a vertical direction is converted and transferred into the linear motion of the jacking rod 305 in a horizontal direction, and the motion displacement distance is reduced to adapt to the stroke change of the push rod 202 of the direct push valve 200. The jacking rod 305 does the linear motion, and the axis of the push rod 202 of the direct push valve 200 keeps consistent with the motion direction of the jacking rod 305, so when pushing the push rod 202, the jacking rod 305 linearly pushes the push rod 202, without relative displacement between the jacking rod 305 and the push rod 202. As a result, the operation on the direct push valve 200 is smoother, no abrasion is caused on the push rod 202, and the service life of the direct push valve 200 is prolonged.

[0084] The direct push valve 200 is a direct push valve 200 with an adjustable low-level flow rate passage, which not only realizes the high-level and low-level gas supply states conveniently, but also allow the adjustment of the low-level flow rate to adapt to the requirements of the low-level flame sizes of different products.

[0085] Through the low-level buffer reset device and the high-level buffer reset device, the operating rod 301 can automatically return to the low-level position or the high-level position, so the user can easily set the gas fireplace to the low-level position or the high-level position.

[0086] Ignition: when the user presses and operates the operating handle 3013 and fully presses the handle, the operating rod 301 moves downward, the jacking rod 305 moves in a direction towards the direct push valve 200 until the push rod 202 is pushed to move in a direction approaching to the gas inlet cavity 2011, and the sealing block 2052 is pushed so that the electromagnetic valve 205 is in an attraction position, the second reset spring 2053 is compressed, and the first reset spring 204 is compressed. At this moment, the gas inlet cavity 2011 communicates with the standing pilot gas outlet 2019, the gas can enter the ignition nozzle 601 of the pilot burner device 600 through the gas inlet cavity 2011 of the direct push valve 200. In addition, at this moment, the ignition switch operating arm 3051 triggers the ignition limit switch 701 to control the igniter 703 to perform discharging ignition on the ignition needle 602. Moreover, in the ignition state, the low-level buffer spring 403 is in a compressed state under the acting force of the operating rod 301.

[0087] Low level: after the flame is ignited, the user may release the acting force applied to the operating handle 3013, the operating rod 301 automatically moves upward under the resilience force of the low-level buffer spring 403, further driving the jacking rod 305 to move in the direction leaving far away from the direct push valve 200. At this moment, under the resilience force of the first reset spring 204, the push rod 202 moves in a direction leaving far away from the gas inlet cavity 2011, until an outer circumference surface of the push rod 202 near the head portion is about to be out of contact with the first sealing ring 206, the low-level buffer sliding rod 402 and the low-level buffer operating arm 3012 are just in a disconnecting critical point, and at this moment, the outer circumference surface of the push rod 202 near the head portion and the first sealing ring 206 are in a sealed state. After entering the transition cavity 2012, the gas of the gas inlet cavity 2011 may enter the gas outlet 2015 through the low-level gas path passage 2016 to burn in a gas fireplace burner, achieving the low-flow rate state. The thermocouple 603 generates thermoelectric potential under the action of the flame, and the generated thermoelectric potential can keep the electromagnetic valve 205 to be in an attraction state.

[0088] High level: in the low-level state, the user operates the operating handle 3013 to lift the operating rod 301 upward, the jacking rod 305 is further driven to continue to move in a direction leaving far away from the direct push valve 200 until the movable baffle sheet 502 is just in contact with the fixing seat 307, reaching the high-level position, and at this moment, if the operating rod 301 is continuously lifted upward, under the action of the high-level reset spring, the resistance is obviously increased to remind the user that the operating rod 301 has been in the high-level position. Even if the user applies an excessive force, and the operating rod 301 slightly exceeds the high-level position, the operating rod 301 will return to the high-level position under the resilience force of the high-level reset spring as along as the acting force applied to the operating handle 3013 is removed. During the transition from the low-level position to the high-level position, under the action of the first reset spring 204, the push rod 202 continues to move in a direction leaving far away from the gas inlet cavity 2011, the outer circumference surface of the push rod 202 near the head portion is out of contact with the first sealing ring 206, the transition cavity 2012 communicates with the gas outlet cavity 2013, and the gas in the transition cavity 2012 can enter the gas outlet 2015 through the gas outlet cavity 2013. In addition, a diameter of the gas path is greater than a diameter of the low-level gas path passage 2016, a larger gas flow is formed to flow to the gas outlet 2015, reaching the high-level flow rate state, and the flame of the gas fireplace is in a high-level size state.

[0089] Shut-off: in the high-level state, the user can continuously lift the operating rod 301 upward to overcome the acting force of the high-level reset spring to reach the shut-off position, at this moment, the shut-off switch operating arm 3031 acts on the shut-off limit switch 702, disconnecting the thermocouple 603 from the electromagnetic valve 205. As a result, the electromagnetic valve 205 cannot receive the thermoelectric potential generated on the thermocouple 603, and then the electromagnetic valve 205 cannot keep the attraction state. Under the action of the second reset spring 2053, the sealing block 2052 seals and isolates the gas inlet cavity 2011 and the transition cavity 2012, and the direct push valve 200 is in a closed state, so the shut-off operation is realized.

[0090] Reset: in the shut-off state, when the acting force applied to the operating rod 301 is removed, under the action of the high-level reset spring, the operating rod 301 is driven by the jacking rod 305 to return to the high-level position. However, at this moment, the direct push valve 200 is in the closed state, so the gas fireplace is also in a shut-off state. That is, at this moment, the gas fireplace is in a standby reset state.

[0091] For the same or similar parts between the embodiments in the specification, reference may be made to each other. Each embodiment focuses on its differences from other embodiments.

[0092] The foregoing descriptions are merely specific implementations of the present invention, but are not intended to limit the protection scope of the present invention. Any variation or replacement readily conceived by a person skilled in the art within the technical scope disclosed in the present invention shall fall within the protection scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.

Examples

Embodiment Construction

[0065]Specific implementations of the present invention will further be described below in combination with the drawings and embodiments in detail. The following embodiments are adopted to describe the present invention rather than limit the scope of the present invention.

[0066]In the description of the present invention, it should be noted that unless otherwise clearly defined and limited, terms "install", "interconnect" and "connect" should be understood in a broad sense, for example, it may be connected in a fixed, detachable or integrated manner; it may be mechanically or electrically connected; it may be directly connected or indirectly connected via an intermediate media; and it may be communication between two elements. For a person of ordinary skill in the art, the specific meanings of the above terms in the present invention may be understood according to specific conditions.

[0067]The implementations of the present invention will be described below with reference to specifi...

Technical Field

[0001] The present invention relates to the technical field of a gas fireplace, and particularly relates to a control system for a gas fireplace.Background

[0002] A gas fireplace is increasingly favored by consumers because of its ornamental effect of real flames and an excellent heating effect. As a decorative gas appliance, the gas fireplace typically require minimal exposed operating elements or concealed designs. However, control components such as a valve are generally disposed at the bottom of a product, which results in results in long distance between the operating elements and the valve for controlling the gas supply. In this case, a set of proper motion mechanism is needed for transferring the motion from the operating elements to the valve to control the opening and closing of the valve. This set of motion mechanism, as well as the valve, relevant ignition, shut-off and detection devices, etc. jointly form a control system for the gas fireplace.

[0003] There are two major types of gas valves: a rotary plug valve and a direct push valve in the market at present. The rotary plug valve needs pressing motion and rotation motion during operation, resulting in complicated motion transfer. Therefore, it is difficult to transfer the motion for a long distance. In contrast, the direct push valve does linear motion, is simple in motion, and is simple and convenient to operate, so it is suitable for occasions where long-distance motion transfer control is required in the gas fireplace.

[0004] However, for a control system for a gas fireplace adapted to a direct push valve on the market, when a terminal component of a motion mechanism pushes the direct push valve, there is certain relative sliding between the terminal component and a push rod of the direct push valve. As disclosed in patent CN201320715287.7, a gas appliance push rod valve adjusting mechanism, the relative sliding may increase the wear on the push rod of the direct push valve and influence the stroke control, and the relative sliding may increase lateral force acting on the push rod of the direct push valve, causing the push rod of the direct push valve to deflect, and further causing the hidden danger of jamming of the push rod of the direct push valve.Summary 1. Technical problem to be solved

[0005] The present invention aims at solving the technical problem to provide a control system for a gas fireplace capable of conveniently realizing two working states: a high-level working state and a low-level working state of the gas fireplace, and capable of reducing wear on a push rod of a direct push valve and prolonging the service life of the direct push valve.2. Technical solution

[0006] In order to solve the technical problem, the solution used in the present invention is a control system for a gas fireplace, including: a housing; a direct push valve, disposed on the housing and including a valve body and a push rod disposed along an axis of the valve body; and a driving mechanism, disposed on the housing and being capable of driving the push rod to do linear motion along the axis of the valve body.

[0007] The driving mechanism includes an operating rod doing linear motion along the housing, a first connecting rod hinged to a bottom end of the operating rod, a rotating rod hinged to the other end of the first connecting rod, a second connecting rod hinged to the other end of the rotating rod, and a jacking rod hinged to the other end of the second connecting rod, a rotating shaft is disposed on the housing, the rotating rod is capable of rotating around the rotating shaft, the jacking rod is capable of doing linear motion along the axis of the valve body, when the operating rod does linear motion in a first direction, the jacking rod is pushed to do linear motion along the axis of the valve body, and when the jacking rod does linear motion along the axis of the valve body, the push rod is pushed to do linear motion along the axis of the valve body.

[0008] In some embodiments, a motion direction of the operating rod is perpendicular to a motion direction of the jacking rod, and the motion direction of the jacking rod is the same as a motion direction of the push rod.

[0009] Specifically, a rotating connection position of the rotating rod and the housing is close to one end of the jacking rod relative to a hinging position of the first connecting rod and the rotating rod. Therefore, after the operating rod moves downward, an end of the first connecting rod hinged to the operating rod moves downward, and the hinging position of the first connecting rod and the rotating rod is pushed to move in a direction approaching to the jacking rod. The rotating rod and the housing are rotatably connected, so the hinging position of the rotating rod and the first connecting rod is pushed to move in a direction approaching to the jacking rod. The jacking rod is limited to move in a direction along the axis of the valve body, so the first connecting rod pushes the jacking rod to move in a direction approaching to the push rod, and thus the push rod is pushed to move along the axis of the valve body in a direction approaching to the valve body. Similarly, after the operating rod moves upward, through the first connecting rod, the rotating rod and the second connecting rod, the jacking rod is driven to move along the axis of the valve body in a direction leaving far away from the push rod, and be disconnected from the push rod, and the push rod is reset under the action of a first reset spring.

[0010] By adopting the above solution, the rotating shaft is disposed on the housing, the rotating rod is rotatably connected with the rotating shaft, and rotatable around the rotating shaft. In addition, since the operating rod, the first connecting rod and the rotating rod are all rotatably connected, and the rotating rod, the second connecting rod and the jacking rod are also all rotatably connected, the housing, the operating rod, the first connecting rod and the rotating rod form a slider-crank mechanism, and the housing, the rotating rod, the second connecting rod and the jacking rod form a crank-slider mechanism. The rotating rod is driven to do rotational motion through the linear motion of the operating rod, so that the jacking rod can be driven to do linear motion, that is, the motion of the operating rod is transferred to the jacking rod. The jacking rod drives the push rod of the direct push valve to move in a direction approaching to the valve body under the driving force of the operating rod.

[0011] In some embodiments, the driving mechanism further includes a guide post and a fixing seat that are fixedly disposed on the housing, the guide post is disposed in a motion stroke of the operating rod, the operating rod is provided, in the motion direction, with a guide groove fit with the guide post, the fixing seat is provided with a first through hole in the axis direction of the valve body, the jacking rod is fit in the first through hole, and the jacking rod is capable of doing linear motion along the first through hole.

[0012] In some embodiments, each of an upper end and a lower end of the operating rod is provided with the guide groove, the housing is provided with two guide posts which are respectively fit with the two guide grooves, so that the linear motion of the operating rod is more stable, and deflection is avoided. Further, the motion stability of the driving mechanism is ensured, and the stability of the linear motion of the jacking rod and the push rod is ensured.

[0013] By adopting the above solution, through the fit between the guide posts and the guide grooves, the linear motion of the operating rod on the housing can be limited. Through the fit between the jacking rod and the first through hole, the linear motion of the jacking rod on the housing can be limited.

[0014] In some embodiments, the direct push valve has a low-level state and a high-level state for the gas flow supplied to the gas fireplace. After the operating rod moves downward, the operating rod drives the jacking rod to approach to the push rod along the axis of the valve body, and pushes the push rod to move to the low-level position along the axis of the valve body in a direction approaching to the valve body, and at this moment, the direct push valve is in the low-level state for the gas flow supplied to the gas fireplace. After the operating rod moves upward, the operating rod drives the jacking rod to leave far away from the push rod along the axis of the valve body, the push rod returns to the high-level position along the axis of the valve body in a direction leaving far away from the valve body, and at this moment the direct push valve is in the high-level state for the gas flow supplied to the gas fireplace.

[0015] In some embodiments, an operating handle is disposed on the operating rod, and the operating handle extends out of the housing and is convenient for a user to operate.

[0016] By adopting the above solution, through the motion of the operating rod, the two working states: the low-level state and the high-level state of the direct push valve for the gas flow supplied to the gas fireplace can be realized, and the operation by the user is convenient.

[0017] In some embodiments, a low-level buffer positioning device is disposed between the operating rod and the housing, and when the operating rod moves downward until the direct push valve is in the low-level state, the operating rod is just in contact with the low-level buffer positioning device.

[0018] Specifically, the operating rod has a low-level position and an ignition position. When the operating rod moves to the low-level position, the direct push valve is in the low-level state. When the operating rod moves to the ignition position, the direct push valve is in an ignition state.

[0019] In some embodiments, when the operating rod continuously moves downward to the ignition position, the operating rod can compress the low-level buffer positioning device. In addition, when the operating rod is in a position between the low-level position and the ignition position, the operating rod can automatically return to the low-level position under the action of the low-level buffer positioning device upon removal of an acting force applied to the operating rod.

[0020] In some embodiments, the low-level buffer positioning device includes a low-level buffer fixing block, a low-level buffer sliding rod, and a low-level buffer spring, the low-level buffer fixing block is fixedly disposed relative to the housing, and the low-level buffer fixing block is provided with a second through hole in a motion direction of the operating rod; the low-level buffer sliding rod is fit in the second through hole, and the low-level buffer sliding rod is capable of doing linear motion along the second through hole; and the operating rod is disposed at a top end of the low-level buffer sliding rod, and when the operating rod moves downward to contact with the top end of the low-level buffer sliding rod, the direct push valve is in the low-level position.

[0021] In addition, an end of the low-level buffer sliding rod far away from the operating rod is provided with a stop baffle block capable of abutting against a bottom end of the low-level buffer fixing block, an end of the low-level buffer sliding rod adjacent to the operating rod is provided with a low-level buffer spring baffle sheet, the low-level buffer spring sleeves the low-level buffer sliding rod, with one end being abutted against the low-level buffer spring baffle sheet, and the other end being abutted against a top end of the low-level buffer fixing block, and the low-level buffer spring is capable of providing the low-level buffer sliding rod with a tendency to always move in a direction approaching to the operating rod.

[0022] In some embodiments, an end of the operating rod adjacent to the low-level buffer sliding rod is provided with a low-level buffer operating arm, and an end of the low-level buffer sliding rod adjacent to the operating rod is provided with a ball head; and when the operating rod moves downward until the direct push valve is in the low-level position, the low-level buffer operating arm is in contact with the ball head.

[0023] By adopting the above solution, when the operating rod moves downward to the low-level position, the low-level buffer operating arm is just in contact with the low-level buffer operating arm, and at this moment, the direct push valve is in the low-level state. When the operating rod continuously moves downward to the ignition position, the low-level buffer operating arm pushes the low-level buffer sliding rod to move downward, the low-level buffer spring is compressed, and at this moment, the direct push valve is in the ignition state. When the operating rod is in a position between the low-level position and the ignition position, a resilience force of the low-level buffer spring applies an upward motion acting force to the low-level buffer operating arm upon removal of an acting force applied to the operating rod. Therefore, the operating rod returns to the low-level position. An end of the low-level buffer sliding rod in contact with the low-level buffer operating arm is configured as a ball head, so that the low-level buffer sliding rod and the low-level buffer operating arm are in point contact, resulting in smoother operation.

[0024] In some embodiments, a high-level buffer positioning device is disposed between the jacking rod and the fixing seat, and when the operating rod moves upward until the direct push valve is in the high-level state, the high-level buffer positioning device is just in contact with the fixing seat.

[0025] Specifically, the operating rod has a high-level position and a shut-off position. When the operating rod moves to the high-level position, the direct push valve is in the high-level state. When the operating rod moves to the shut-off position, the direct push valve is in the shut-off state.

[0026] In some embodiments, the high-level buffer positioning device includes a high-level buffer baffle sheet clamped on an end of the jacking rod adjacent to the push rod, a movable baffle sheet sleeving an end of the jacking rod adjacent to the fixing seat, and a high-level buffer spring sleeving the jacking rod; one end of the high-level buffer spring is abutted against the high-level buffer baffle sheet, and the other end is abutted against the movable baffle sheet; the operating rod moves upward and drives the jacking rod to move until the movable baffle sheet is in contact with the fixing seat, and at this moment, the direct push valve is in the high-level position; and the high-level buffer spring is capable of providing the jacking rod with a tendency to always move in a direction approaching to the push rod.

[0027] In some embodiments, an end of the jacking rod adjacent to the push rod is provided with a high-level buffer clamp groove, the high-level buffer baffle sheet is clamped into the high-level buffer clamp groove to further realize the fixed installation of the high-level buffer baffle sheet on the jacking rod. An end of the jacking rod adjacent to the fixing seat is provided with a stop step, and the movable baffle sheet is abutted against the stop step under a resilience force of the high-level buffer spring. The movable baffle sheet sleeves the jacking rod, so under the action of an external force, after the movable baffle sheet is abutted against an end of the fixing seat adjacent to the direct push valve, the movable baffle sheet is limited, and the high-level buffer spring is compressed.

[0028] By adopting the above solution, when the operating rod moves upward, the jacking rod is driven to move along the axis of the valve body in a direction leaving far away from the direct push valve until the operating rod reaches the high-level position, at this moment, the movable baffle sheet is just in contact with the fixing seat, and the direct push valve is in the high-level state. At this moment, if the operating rod continuously moves upward, since the fixing seat is fixed onto the housing, the movable baffle sheet is limited onto the fixing seat, then high-level buffer spring is compressed, at this moment, if an acting force applied to the operating rod is removed, the resilience force of the high-level buffer spring applies an acting force to the high-level buffer baffle sheet, so that the jacking rod is driven to move in a direction approaching to the push rod, and the jacking rod drives the operating rod to return to the high-level position. i.e., the position where the operating rod is positioned when the movable baffle sheet is just in contact with the fixing seat.

[0029] In some embodiments, a motion distance of the operating rod is greater than a motion distance of the jacking rod to realize the motion displacement reduction function of the driving mechanism. Therefore, the position of each level can be more clearly distinguished when the operating rod is operated to move.

[0030] In some embodiments, the direct push valve includes: a valve body, internally provided with a gas inlet cavity, a transition cavity and a gas outlet cavity in sequential connection, and including a gas inlet communicating with the gas inlet cavity, and a gas outlet communicating with the gas outlet cavity; a push rod, disposed in the gas outlet cavity, and being capable of doing linear motion in an axial direction of the gas outlet cavity; a middle sealing body, sleeving an end of the push rod adjacent to the gas inlet cavity; a first reset spring, sleeving the push rod and positioned between the middle sealing body and a tail portion of the push rod, an end of the push rod adjacent to the jacking rod forming the tail portion of the push rod, and the first reset spring being capable of providing the push rod with a tendency to always move in a direction leaving far away from the gas outlet cavity; and an electromagnetic valve, disposed at an end of the valve body adjacent to the gas inlet cavity, and including a valve core capable of doing linear motion along an axial direction of the gas inlet cavity, and a sealing block connected onto an end of the valve core adjacent to the gas outlet cavity, and the sealing block being capable of separating the gas inlet cavity from the transition cavity.

[0031] The valve body is internally provided with a first sealing ring capable of forming fit sealing with the push rod, and the first sealing ring is capable of separating the transition cavity from the gas outlet cavity; the valve body is internally provided with a low-level gas path passage capable of communicating the transition cavity with the gas outlet, a low-level adjusting rod is disposed in the low-level gas path passage, and a circulation gap is formed between the low-level adjusting rod and an inner wall of the low-level gas path passage; and the low-level adjusting rod is movably disposed in the low-level gas path passage to adjust the size of the circulation gap.

[0032] Specifically, the first sealing ring is disposed between the transition cavity and the gas outlet cavity, and through the fit sealing of the push rod and the first sealing ring, a gas flow entering from the gas inlet cavity can only flow to the gas outlet from the low-level gas path passage. When the sealing of the push rod and the first sealing ring is removed, the gas flow entering from the gas inlet cavity can respectively flow to the gas outlet from the low-level gas path passage, and flow to the gas outlet from the gas outlet cavity. With these two paths for leading out the gas flow, a high-fire state can be achieved.

[0033] In some embodiments, a second reset spring is disposed between the valve core and the sealing block, and the second reset spring can provide the valve core with a tendency to always move in a direction approaching to the transition cavity.

[0034] By adopting the above solution, through the arrangement of the low-level gas path passage, a low-level working state can be realized. Through the arrangement of the low-level adjusting rod in the low-level gas path passage, the low-level adjusting rod can be adjusted according to requirements, so that the size of the circulation gap between the low-level adjusting rod and the inner wall of the low-level gas path passage can be adjusted, and further the flow rate flowing to the gas outlet can be further adjusted.

[0035] In some embodiments, the low-level gas path passage includes a low-level gas inlet passage communicating with the transition cavity and a low-level gas outlet passage communicating with the gas outlet, and the low-level gas inlet passage intersects with the low-level gas outlet passage; and the low-level gas inlet passage or the low-level gas outlet passage axially extends to form a low-level adjusting opening, and the low-level adjusting rod is disposed in the low-level adjusting opening, and is capable of doing linear motion in an axial direction of the low-level adjusting opening.

[0036] The low-level adjusting rod includes a first shaft portion and a second shaft portion in sequential connection in the axial direction of the low-level adjusting opening, a shaft diameter of the first shaft portion is smaller than a shaft diameter of the second shaft portion, a transition shaft portion is formed between the first shaft portion and the second shaft portion, the first shaft portion is capable of extending into the low-level gas inlet passage or the low-level gas outlet passage, and the circulation gap is formed between the transition shaft portion and an inner wall of the low-level gas path passage; an outer surface of the transition shaft portion is a transition curve connected with outer surfaces of the first shaft portion and the second shaft portion, so when the low-level adjusting rod moves along the axial direction of the low-level adjusting opening in a direction leaving far away from the low-level gas inlet passage or the low-level gas outlet passage, the size of the circulation gap increases; and when the low-level adjusting rod moves along the axial direction of the low-level adjusting opening in a direction approaching to the low-level gas inlet passage or the low-level gas outlet passage, the size of the circulation gap decreases.

[0037] In some embodiments, the low-level gas inlet passage is perpendicular to the low-level gas outlet passage.

[0038] By adopting the above solution, in a process that the low-level adjusting rod does linear motion in the axial direction of the low-level adjusting opening, the size of the circulation gap between the low-level adjusting rod and the inner wall of the low-level gas path passage can be adjusted, and further the flow rate flowing to the gas outlet can be adjusted.

[0039] In some embodiments, a second sealing ring is disposed between the low-level adjusting rod and the low-level adjusting opening, and the second sealing ring and the low-level adjusting opening are in interference fit, so the sealing between the second sealing ring and the low-level adjusting opening can be realized. The second sealing ring and the low-level adjusting rod are in interference fit, so the sealing between the second sealing ring and the low-level adjusting rod can be realized, and further the sealing between the low-level adjusting rod and the low-level adjusting opening can be ensured to prevent gas flow leakage, realizing high safety .

[0040] In some embodiments, the low-level adjusting rod and the low-level adjusting opening are in threaded connection. A tail end of the low-level adjusting rod is provided with a fit portion capable of being fit with an external structure, so that the low-level adjusting rod can do linear motion in the axial direction of the low-level adjusting opening, the fit portion includes structures such as a cross groove or a straight groove, and the low-level adjusting rod can be conveniently screwed in or screwed out with a common screwdriver, so that the effect of adjusting the size of the circulation gap formed between the low-level adjusting rod and the low-level gas path passage can be realized, and the operation is convenient.

[0041] In some embodiments, one of the low-level gas inlet passage and the low-level gas outlet passage extends axially to form the low-level adjusting opening; and the other one of the low-level gas inlet passage and the low-level gas outlet passage extends axially to from a process hole, and a plug is fit in the process hole.

[0042] In some embodiments, the plug includes a steel ball, the plug and the process hole are in interference fit, after the plug is assembled into the process hole, the process hole may be sealed, thereby ensuring good sealing performance of the low-level gas path passage.

[0043] By adopting the above solution, the low-level gas path passage is formed through machining. Due to the process manufacturing, a process hole is generally formed. In order to plug the process hole, the plug is used to plug the process hole to ensure the sealing performance of the low-level gas path passage.

[0044] In some embodiments, the valve body is further provided with a standing pilot gas outlet communicating with the transition cavity.

[0045] In some embodiments, a head portion of the push rod is provided with an inclined surface for guiding, so that the motion of the push rod is smoother. Particularly, when the push rod is fit to an inner hole of the first sealing ring, the inclined surface enables the push rod to smoothly enter the inner hole without scratching the inner hole of the first sealing ring. A tail portion of the push rod is of a round shaft structure, and an end of a tail portion of the push rod adjacent to the middle sealing body is provided with a notch, so as to release a gas pressure in a space formed between the tail portion of the push rod and the inner wall of the valve body.

[0046] By adopting the above solution, when the push rod does linear motion in the axial direction of the gas outlet cavity, the tail portion of the push rod cooperates with the inner wall of the valve body to move. The gap between the tail portion of the push rod and the inner wall of the valve body is very small, and in use, the application of lubricating grease forms a sealed state between the tail portion of the push rod and the inner wall of the valve body. Therefore, when the push rod does linear motion, the gas pressure in the space formed between the tail portion of the push rod and the inner wall of the valve body also changes. Due to the formation of the notch, the gas pressure in the space formed between the tail portion of the push rod and the inner wall of the valve body can be released, realizing high safety.

[0047] In some embodiments, the control system further includes a pilot burner device and an ignition / shut-off control device.

[0048] The pilot burner device includes an ignition nozzle, an ignition needle, and a thermocouple, the ignition nozzle is connected with a standing pilot gas outlet on the direct push valve, and the thermocouple is connected with the electromagnetic valve. The thermocouple generates thermoelectric potential under the effect of flames, and through the thermoelectric potential generated on the thermocouple, the electromagnetic valve keeps an attraction state.

[0049] The ignition / shut-off control device includes an ignition limit switch, a shut-off limit switch and an igniter, the ignition limit switch is disposed in a position where the operating rod moves downward to an ignition position and the driving mechanism is capable of touching the ignition limit switch, and the shut-off limit switch is disposed in a position where the operating rod moves upward to a shut-off position and the driving mechanism is capable of touching the shut-off limit switch; and the igniter is connected with the ignition needle, the ignition limit switch is connected in series with the igniter and the ignition needle, and the shut-off limit switch is connected in series with the electromagnetic valve and the thermocouple.

[0050] In some embodiments, an ignition switch operating arm is disposed on the jacking rod, and when the operating rod moves downward to the ignition position, the ignition switch operating arm is capable of touching the ignition limit switch.

[0051] In some embodiments, the ignition limit switch is relatively disposed above the jacking rod, an end of the jacking rod adjacent to the ignition limit switch is provided with an ignition switch operating arm. In addition, when the operating rod moves downward to the ignition position, the jacking rod moves in the direction approaching to the push rod until the ignition switch operating arm just triggers the ignition limit switch.

[0052] In some embodiments, a shut-off switch operating arm is disposed on the rotating rod, and when the operating rod moves upward to the shut-off position, the shut-off switch operating arm is capable of touching the shut-off limit switch.

[0053] In some embodiments, the shut-off switch operating arm is disposed above the rotating rod, and the shut-off limit switch is relatively disposed at an end of the rotating rod adjacent to the push rod. When the operating rod moves upward to the shut-off position, the rotating rod rotates around the rotating shaft, so that the shut-off switch operating arm relatively moves downward to just trigger the shut-off limit switch.Working principle of the present invention:

[0054] The driving mechanism is practically formed by a slider-crank mechanism and a crank-slider mechanism, the linear motion of the operating rod in a vertical direction is converted and transferred into the linear motion of the jacking rod in a horizontal direction, and the motion displacement distance is reduced to adapt to the stroke change of the push rod of the direct push valve. The jacking rod does the linear motion, and the axis of the push rod of the direct push valve keeps consistent with the motion direction of the jacking rod, so when pushing the push rod, the jacking rod linearly pushes the push rod, without relative displacement between the jacking rod and the push rod. As a result, the operation on the direct push valve is smoother, no abrasion is caused on the push rod, and the service life of the direct push valve is prolonged.

[0055] The direct push valve is a direct push valve with an adjustable low-level flow rate passage, which not only realizes the high-level and low-level gas supply states conveniently, but also allow the adjustment of the low-level flow rate to adapt to the requirements of the low-level flame sizes of different products.

[0056] Through the low-level buffer reset device and the high-level buffer reset device, the operating rod can automatically return to the low-level position or the high-level position, so the user can easily set the gas fireplace to the low-level position or the high-level position.

[0057] Ignition: when the user presses and operates the operating handle and fully presses the handle, the operating rod moves downward, the jacking rod moves in a direction towards the direct push valve until the push rod is pushed to move in a direction approaching to the gas inlet cavity, and the sealing block is pushed so that the electromagnetic valve is in an attraction position, the second reset spring is compressed, and the first reset spring is compressed; and at this moment, the gas inlet cavity communicates with the standing pilot gas outlet, the gas can enter the ignition nozzle of the pilot burner device through the gas inlet cavity of the direct push valve. In addition, at this moment, the ignition switch operating arm triggers the ignition limit switch to control the igniter to perform discharging ignition on the ignition needle. Moreover, in the ignition state, the low-level buffer spring is in a compressed state under the acting force of the operating rod.

[0058] Low level: after the flame is ignited, the user may release the acting force applied to the operating handle, the operating rod automatically moves upward under the resilience force of the low-level buffer spring, further driving the jacking rod to move in the direction leaving far away from the direct push valve; at this moment, under the resilience force of the first reset spring, the push rod moves in a direction leaving far away from the gas inlet cavity, until an outer circumference surface of the push rod near the head portion is about to be out of contact with the first sealing ring, the low-level buffer sliding rod and the low-level buffer operating arm are just in a disconnecting critical point, and at this moment, the outer circumference surface of the push rod near the head portion and the first sealing ring are in a sealed state. After entering the transition cavity, the gas of the gas inlet cavity may enter the gas outlet through the low-level gas path passage to burn in a gas fireplace burner, achieving the low-flow rate state; and the thermocouple generates thermoelectric potential under the action of the flame, and the generated thermoelectric potential can keep the electromagnetic valve to be in an attraction state.

[0059] High level: in the low-level state, the user operates the operating handle to lift the operating rod upward, the jacking rod is further driven to continue to move in a direction leaving far away from the direct push valve until the movable baffle sheet is just in contact with the fixing seat, reaching the high-level position, and at this moment, if the operating rod is continuously lifted upward, under the action of the high-level reset spring, the resistance is obviously increased to remind the user that the operating rod has been in the high-level position. Even if the user applies an excessive force, and the operating rod slightly exceeds the high-level position, the operating rod will return to the high-level position under the resilience force of the high-level reset spring as along as the acting force applied to the operating handle is removed. During the transition from the low-level position to the high-level position, under the action of the first reset spring, the push rod continues to move in a direction leaving far away from the gas inlet cavity, the outer circumference surface of the push rod near the head portion is out of contact with the first sealing ring, the transition cavity communicates with the gas outlet cavity, and the gas in the transition cavity can enter the gas outlet through the gas outlet cavity. In addition, a diameter of the gas path is greater than a diameter of the low-level gas path passage, a larger gas flow is formed to flow to the gas outlet, reaching the high-level flow rate state, and the flame of the gas fireplace is in a high-level size state.

[0060] Shut-off: in the high-level state, the user can continuously lift the operating rod upward to overcome the acting force of the high-level reset spring to reach the shut-off position, at this moment, the shut-off switch operating arm acts on the shut-off limit switch, disconnecting the thermocouple from the electromagnetic valve. As a result, the electromagnetic valve cannot receive the thermoelectric potential generated on the thermocouple, and then the electromagnetic valve cannot keep the attraction state. Under the action of the second reset spring, the sealing block seals and isolates the gas inlet cavity and the transition cavity, and the direct push valve is in a closed state, so the shut-off operation is realized.

[0061] Reset: in the shut-off state, when the acting force applied to the operating rod is removed, under the action of the high-level reset spring, the operating rod is driven by the jacking rod to return to the high-level position. However, at this moment, the direct push valve is in the closed state, so the gas fireplace is also in a shut-off state. That is, at this moment, the gas fireplace is in a standby reset state.3. Beneficial effects

[0062] Compared with the prior art, the present invention designs a control system for a gas fireplace. (1) The present invention converts and transfers the linear motion of the operating rod in the vertical direction into the linear motion of the jacking rod through the driving mechanism, and reduces the motion displacement distance to adapt to the stroke change of the push rod of the direct push valve. The jacking rod does linear motion, and the axis of the push rod of the direct push valve keeps consistent with the motion direction of the jacking rod, so when pushing the push rod, the jacking rod linearly pushes the push rod, without relative displacement between the jacking rod and the push rod. As a result, the operation on the direct push valve is smoother, no abrasion is caused on the push rod, and the service life of the direct push valve is prolonged. (2) The direct push valve of the present invention is a direct push valve with an adjustable low-level flow rate passage, which not only realizes the high-level and low-level gas supply states conveniently, but also allow the adjustment of the low-level flow rate to adapt to the requirements of the low-level flame sizes of different products. (3) Through the arrangement of the low-level buffer reset device and the high-level buffer reset device, the operating rod can automatically return to the low-level position or the high-level position, the user can easily set the gas fireplace to the low-level position or the high-level position, the structure is simple, and the operation is convenient. Brief Description of Figures

[0063] To describe the technical solutions of the embodiments of the present invention more clearly, the following briefly introduces the accompanying drawings required for describing the embodiments. Apparently, the accompanying drawings in the following description show only some embodiments of the present invention, and a person of ordinary skill in the art may still derive other drawings from these accompanying drawings without creative efforts. FIG. 1 is a schematic structural diagram of a control system for a gas fireplace according to the present invention. FIG. 2 is a cross-sectional view of a direct push valve according to the present invention. FIG. 3 is a schematic structural diagram of a control system for a gas fireplace from another angle according to the present invention. FIG. 4 is a partial enlarged view of a control system for a gas fireplace according to the present invention. FIG. 5 is a schematic structural diagram of a control system for a gas fireplace in an ignition state according to the present invention. FIG. 6 is a cross-sectional view of a direct push valve in an ignition state according to the present invention. FIG. 7 is an enlarged view of a portion A in FIG. 6. FIG. 8 is a schematic structural diagram of a control system for a gas fireplace in a low-level state according to the present invention. FIG. 9 is a partial cross-sectional view of a portion B-B in FIG. 8. FIG. 10 is a cross-sectional view of a direct push valve in a low-level state according to the present invention. FIG. 11 is a schematic structural diagram of a control system for a gas fireplace in a high-level state according to the present invention. FIG. 12 is a partial cross-sectional view of a portion C-C in FIG. 11. FIG. 13 is a cross-sectional view of a direct push valve in a high-level state according to the present invention. FIG. 14 is a schematic structural diagram of a control system for a gas fireplace in a shut-off state according to the present invention. FIG. 15 is a cross-sectional view of a direct push valve in a closed state according to the present invention.

[0064] In the figures, 100 denotes a housing, 103 denotes a rotating shaft, 200 denotes a direct push valve, 201 denotes a valve body, 2011 denotes a gas inlet cavity, 2012 denotes a transition cavity, 2013 denotes a gas outlet cavity, 2014 denotes a gas inlet, 2015 denotes a gas outlet, 2016 denotes a low-level gas path passage, 2016a denotes a low-level gas inlet passage, 2016b denotes a low-level gas outlet passage, 2017 denotes a low-level adjusting opening, 2018 denotes a process hole, 2019 denotes a standing pilot gas outlet, 202 denotes a push rod, 2021 denotes an inclined surface, 2022 denotes a notch, 203 denotes a middle sealing body, 204 denotes a first reset spring, 205 denotes an electromagnetic valve, 2051 denotes a valve core, 2052 denotes a sealing block, 2053 denotes a second reset spring, 206 denotes a first sealing ring, 207 denotes a low-level adjusting rod, 2071 denotes a first shaft portion, 2072 denotes a second shaft portion, 2073 denotes a transition shaft portion, 2074 denotes a fit portion, 208 denotes a circulation gap, 209 denotes a second sealing ring, 210 denotes a plug, 300 denotes a driving mechanism, 301 denotes an operating rod, 3011 denotes a guide groove, 3012 denotes a low-level buffer operating arm, 3013 denotes an operating handle, 302 denotes a first connecting rod, 303 denotes a rotating rod, 3031 denotes a shut-off switch operating arm, 304 denotes a second connecting rod, 305 denotes a jacking rod, 3051 denotes an ignition switch operating arm, 3052 denotes a high-level buffer clamp groove, 3053 denotes a stop step, 306 denotes a guide post, 307 denotes a fixing seat, 3071 denotes a first through hole, 400 denotes a low-level buffer positioning device, 401 denotes a low-level buffer fixing block, 4011 denotes a second through hole, 402 denotes a low-level buffer sliding rod, 4021 denotes a stop baffle block, 4022 denotes a low-level buffer spring baffle sheet, 4023 denotes a ball head, 403 denotes a low-level buffer spring, 500 denotes a high-level buffer positioning device, 501 denotes a high-level buffer baffle sheet, 502 denotes a movable baffle sheet, 503 denotes a high-level buffer spring, 600 denotes a pilot burner device, 601 denotes an ignition nozzle, 602 denotes an ignition needle, 603 denotes a thermocouple, 700 denotes an ignition / shut-off control device, 701 denotes an ignition limit switch, 702 denotes a shut-off limit switch, and 703 denotes an igniter.Detailed Description

[0065] Specific implementations of the present invention will further be described below in combination with the drawings and embodiments in detail. The following embodiments are adopted to describe the present invention rather than limit the scope of the present invention.

[0066] In the description of the present invention, it should be noted that unless otherwise clearly defined and limited, terms "install", "interconnect" and "connect" should be understood in a broad sense, for example, it may be connected in a fixed, detachable or integrated manner; it may be mechanically or electrically connected; it may be directly connected or indirectly connected via an intermediate media; and it may be communication between two elements. For a person of ordinary skill in the art, the specific meanings of the above terms in the present invention may be understood according to specific conditions.

[0067] The implementations of the present invention will be described below with reference to specific examples. Those skilled in the art may easily understand other advantages and effects of the present invention by the contents disclosed in the present specification. It is clear that the described embodiments are a part of the embodiments of the present invention, rather than all the embodiments. The present invention may also be implemented or applied through other different specific implementations. Various modifications or changes may also be made to the details in the present specification without departing from the spirit of the present invention based on different viewpoints and applications. It should be noted that in the absence of conflicts, the following embodiments and features in the embodiments may be combined mutually. Based on the embodiments of the present invention, all other embodiments obtained by a person of ordinary skill in the art without any creative effort are within the protection scope of the present invention.

[0068] Specific details provided in the following descriptions are intended to provide convenience for thoroughly understanding the examples. However, those skilled in the art shall understand that they may do practices without these specific details.

[0069] It needs to be noted that FIG. 5 shows a structure of a control system for a gas fireplace in an ignition state according to the present invention, where an operating rod 301 is in an ignition position. FIG. 6 shows a structure of a direct push valve 200 in an ignition state according to the present invention, where a push rod 202 is in an ignition position. FIG. 8 shows a structure of a control system for a gas fireplace in a low-level state according to the present invention, where an operating rod 301 is in a low-level position. FIG. 10 shows a structure of a direct push valve 200 in a low-level state according to the present invention, where a push rod 202 is in a low-level position. FIG. 11 shows a structure of a control system for a gas fireplace in a high-level state according to the present invention, where an operating rod 301 is in a high-level position. FIG. 13 shows a structure of a direct push valve 200 in a high-level state according to the present invention, where a push rod 202 is in a high position. FIG. 14 shows a mechanism of a control system for a gas fireplace in a shut-off state according to the present invention, where an operating rod 301 is in a shut-off position. FIG. 15 shows a structure of a direct push valve in a shut-off state according to the present invention, where a push rod 202 is in a shut-off position.

[0070] The technical solution provided by each embodiment of the present invention will be described with reference to the accompanying drawings.

[0071] As shown in FIG. 1 to FIG. 15, the present invention provides a control system for a gas fireplace, including a housing 100, a direct push valve 200 disposed on the housing 100, and a driving mechanism 300. The direct push valve 200 includes a valve body 201, and a push rod 202 disposed along an axis of the valve body 201. The driving mechanism 300 is disposed on the housing 100, and is capable of driving the push rod 202 to do linear motion along the axis of the valve body 201, the driving mechanism 300 includes an operating rod 301 doing linear motion along the housing 100, a first connecting rod 302 hinged to a bottom end of the operating rod 301, a rotating rod 303 hinged to the other end of the first connecting rod 302, a second connecting rod 304 hinged to the other end of the rotating rod 303, and a jacking rod 305 hinged to the other end of the second connecting rod 304, a rotating shaft 103 is disposed on the housing 100, the rotating rod 303 is capable of rotating around the rotating shaft 103, the jacking rod 305 is disposed adjacent to the push rod 202, and the jacking rod 305 is disposed along the axis of the valve body 201, and is capable of doing linear motion along the axis of the valve body 201. When the operating rod 301 does linear motion in a vertical direction of the housing 100, the jacking rod 305 is pushed to do linear motion along the axis of the valve body 201. When the jacking rod 305 does linear motion along the axis of the valve body 201, the push rod 202 is pushed to do linear motion along the axis of the valve body 201. In addition, a motion direction of the operating rod 301 is perpendicular to a motion direction of the jacking rod 305, and the motion direction of the jacking rod 305 is the same as a motion direction of the push rod 202. Specifically, a rotating connection position of the rotating rod 303 and the housing 100 is close to one end of the jacking rod 305 relative to a hinging position of the first connecting rod 302 and the rotating rod 303. Therefore, after the operating rod 301 moves downward, the end of the first connecting rod 302 hinged to the operating rod 301 moves downward, and a hinging position of the first connecting rod 302 and the rotating rod 303 is pushed to move in a direction approaching to the jacking rod 305. The rotating rod 303 and the housing 100 are rotatably connected, so the hinging position of the rotating rod 303 and the first connecting rod 302 is pushed to move in a direction approaching to the jacking rod 305. The jacking rod 305 is limited to move in a direction along the axis of the valve body 201, so the first connecting rod 302 pushes the jacking rod 305 to move in a direction approaching to the push rod 202, and thus the push rod 202 is pushed to move along the axis of the valve body 201 in a direction approaching to the valve body 201. Similarly, after the operating rod 301 moves upward, through the first connecting rod 302, the rotating rod 303 and the second connecting rod 304, the jacking rod 305 is driven to move along the axis of the valve body 201 in a direction leaving far away from the push rod 202, and be disconnected from the push rod 202, and the push rod 202 is reset under the action of a first reset spring 204. By adopting the above solution, the rotating shaft 103 is disposed on the housing 100, the rotating rod 303 is rotatably connected with the rotating shaft 103, and rotatable around the rotating shaft 103. In addition, the operating rod 301, since the first connecting rod 302 and the rotating rod 303 are all rotatably connected, and the rotating rod 303, the second connecting rod 304 and the jacking rod 305 are all rotatably connected, the housing 100, the operating rod 301, the first connecting rod 302 and the rotating rod 303 form a slider-crank mechanism, and the housing 100, the rotating rod 303, the second connecting rod 304 and the jacking rod 305 form a crank-slider mechanism. The rotating rod 303 is driven to do rotational motion through the linear motion of the operating rod 301, so that the jacking rod 305 is driven to do linear motion, that is, the motion of the operating rod 301 is transferred to the jacking rod 305. The jacking rod 305 drives the push rod 202 of the direct push valve 200 to move in a direction approaching to the valve body 201 under the driving force of the operating rod 301. In some embodiments, the driving mechanism 300 further includes a guide post 306 and a fixing seat 307 that are fixedly disposed on the housing 100, the guide post 306 is disposed in a motion stroke of the operating rod 301, the operating rod 301 is provided, in the motion direction, with a guide groove 3011 fit with the guide post 306, the fixing seat 307 is provided with a first through hole 3071 in the axis direction of the valve body 201, the jacking rod 305 is fit in the first through hole 3071, and the jacking rod 305 is capable of doing linear motion along the first through hole 3071. In some embodiments, each of an upper end and a lower end of the operating rod 301 is provided with the guide groove 3011, the housing 100 is provided with two guide posts 306 which are respectively fit with the two guide grooves 3011, so that the linear motion of the operating rod 301 is more stable, and deflection is avoided. Further, the motion stability of the driving mechanism 300 is ensured, and the stability of the linear motion of the jacking rod 305 and the push rod 202 is ensured. By adopting the above solution, through the fit between the guide posts 306 and the guide grooves 3011, the linear motion of the operating rod 301 on the housing 100 can be limited. Through the fit between the jacking rod 305 and the first through hole 3071, the linear motion of the jacking rod 305 on the housing 100 can be limited.

[0072] In some embodiments, the direct push valve 200 has a low-level state and a high-level state for the gas flow supplied to the gas fireplace. After the operating rod 301 moves downward, the operating rod 301 drives the jacking rod 305 to approach to the push rod 202 along the axis of the valve body 201, and pushes the push rod 202 to move to the low-level position along the axis of the valve body 201 in a direction approaching to the valve body 201, and at this moment, the direct push valve 200 is in the low-level state for the gas flow supplied to the gas fireplace. After the operating rod 301 moves upward, the operating rod 301 drives the jacking rod 305 to leave far away from the push rod 202 along the axis of the valve body 201, the push rod 202 returns to the high-level position along the axis of the valve body 201 in a direction leaving far away from the valve body 201, and at this moment, the direct push valve 200 is in the high-level state for the gas flow supplied to the gas fireplace. In some embodiments, an operating handle 3013 is disposed on the operating rod 301, and the operating handle 3013 extends out of the housing 100 and is convenient for a user to operate. By adopting the above solution, through the motion of the operating rod 301, the two working states: the low-level state and the high-level state of the direct push valve 200 for the gas flow supplied to the gas fireplace can be realized, and the operation by the user is convenient.

[0073] In some embodiments, a low-level buffer positioning device 400 is disposed between the operating rod 301 and the housing 100, and when the operating rod 301 moves downward until the direct push valve 200 is in the low-level state, the operating rod 301 is just in contact with the low-level buffer positioning device 400. Specifically, the operating rod 301 has a low-level position and an ignition position. When the operating rod 301 moves to the low-level position, the direct push valve 200 is in the low-level state. When the operating rod 301 moves to the ignition position, the direct push valve 200 is in an ignition state. In some embodiments, when the operating rod 301 continuously moves downward to the ignition position, the operating rod 301 can compress the low-level buffer positioning device 400. In addition, when the operating rod 301 is in a position between the low-level position and the ignition position, the operating rod 301 can automatically return to the low-level position under the action of the low-level buffer positioning device 400 upon removal of an acting force applied to the operating rod 301. In some embodiments, the low-level buffer positioning device 400 includes a low-level buffer fixing block 401, a low-level buffer sliding rod 402, and a low-level buffer spring 403, the low-level buffer fixing block 401 is fixedly disposed relative to the housing 100, and the low-level buffer fixing block 401 is provided with a second through hole 4011 in a motion direction of the operating rod 301. The low-level buffer sliding rod 402 is fit in the second through hole 4011, and the low-level buffer sliding rod 402 is capable of doing linear motion along the second through hole 4011. The operating rod 301 is disposed at a top end of the low-level buffer sliding rod 402, and when the operating rod 301 moves downward to contact with the top end of the low-level buffer sliding rod 402, the direct push valve 200 is in the low-level position. An end of the low-level buffer sliding rod 402 far away from the operating rod 301 is provided with a stop baffle block 4021 capable of abutting against a bottom end of the low-level buffer fixing block 401, an end of the low-level buffer sliding rod 402 adjacent to the operating rod 301 is provided with a low-level buffer spring baffle sheet 4022, the low-level buffer spring 403 sleeves the low-level buffer sliding rod 402, with one end being abutted against the low-level buffer spring baffle sheet 4022, and the other end being abutted against a top end of the low-level buffer fixing block 401, and the low-level buffer spring 403 is capable of providing the low-level buffer sliding rod 402 with a tendency to always move in a direction approaching to the operating rod 301. In some embodiments, an end of the operating rod 301 adjacent to the low-level buffer sliding rod 402 is provided with a low-level buffer operating arm 3012, and an end of the low-level buffer sliding rod 402 adjacent to the operating rod 301 is provided with a ball head 4023. When the operating rod 301 moves downward until the direct push valve 200 is in the low-level position, the low-level buffer operating arm 3012 is in contact with the ball head 4023. By adopting the above solution, when the operating rod 301 moves downward to the low-level position, the low-level buffer operating arm 3012 is just in contact with the low-level buffer operating arm 3012, and at this moment, the direct push valve 200 is in the low-level state. When the operating rod 301 continuously moves downward to the ignition position, the low-level buffer operating arm 3012 pushes the low-level buffer sliding rod 402 to move downward, the low-level buffer spring 403 is compressed, and at this moment, the direct push valve 200 is in the ignition state. When the operating rod 301 is in a position between the low-level position and the ignition position, a resilience force of the low-level buffer spring 403 applies an upward motion acting force to the low-level buffer operating arm 3012 upon removal of an acting force applied to the operating rod 301. Therefore, the operating rod 301 returns to the low-level position. An end of the low-level buffer sliding rod 402 in contact with the low-level buffer operating arm 3012 is configured as a ball head 4023, so that the low-level buffer sliding rod 402 and the low-level buffer operating arm 3012 are in point contact, resulting in smoother operation.

[0074] In some embodiments, a high-level buffer positioning device 500 is disposed between the jacking rod 305 and the fixing seat 307, and when the operating rod 301 moves upward until the direct push valve 200 is in the high-level state, the high-level buffer positioning device 500 is just in contact with the fixing seat 307. Specifically, the operating rod 301 has a high-level position and a shut-off position. When the operating rod 301 moves to the high-level position, the direct push valve 200 is in the high-level state. When the operating rod 301 moves to the shut-off position, the direct push valve 200 is in the shut-off state. In some embodiments, the high-level buffer positioning device 500 includes a high-level buffer baffle sheet 501 clamped on an end of the jacking rod 305 adjacent to the push rod 202, a movable baffle sheet 502 sleeving an end of the jacking rod 305 adjacent to the fixing seat 307, and a high-level buffer spring 503 sleeving the jacking rod 305. One end of the high-level buffer spring 503 is abutted against the high-level buffer baffle sheet 501, and the other end is abutted against the movable baffle sheet 502. The operating rod 301 moves upward and drives the jacking rod 305 to move until the movable baffle sheet 502 is in contact with the fixing seat 307, and at this time, the direct push valve 200 is in the high-level position. The high-level buffer spring 503 is capable of providing the jacking rod 305 with a tendency to always move in a direction approaching to the push rod 202. In some embodiments, an end of the jacking rod 305 adjacent to the push rod 202 is provided with a high-level buffer clamp groove 3052, the high-level buffer baffle sheet 501 is clamped into the high-level buffer clamp groove 3052 to further realize the fixed installation of the high-level buffer baffle sheet 501 on the jacking rod 305. An end of the jacking rod 305 adjacent to the fixing seat 307 is provided with a stop step 3053, and the movable baffle sheet 502 is abutted against the stop step 3053 under a resilience force of the high-level buffer spring 503. The movable baffle sheet 502 sleeves the jacking rod 305, so under the action of external force, after the movable baffle sheet 502 is abutted against an end of the fixing seat 307 adjacent to the direct push valve 200, the movable baffle sheet 502 is limited, and the high-level buffer spring 503 is compressed. By adopting the above solution, when the operating rod 301 moves upward, the jacking rod 305 is driven to move along the axis of the valve body 201 in a direction leaving far away from the direct push valve 200 until the operating rod 301 reaches the high-level position, at this moment, the movable baffle sheet 502 is just in contact with the fixing seat 307, and the direct push valve 200 is in the high-level state. At this moment, if the operating rod 301 continuously moves upwards, since the fixing seat 307 is fixed onto the housing 100, the movable baffle sheet 502 is limited onto the fixing seat 307, then the high-level buffer spring 503 is compressed, at this moment, if an acting force applied to the operating rod 301 is removed, the resilience force of the high-level buffer spring 503 applies an acting force to the high-level buffer baffle sheet 501, so that the jacking rod 305 is driven to move in a direction approaching to the push rod 202, and the jacking rod 305 drives the operating rod 301 to return to the high-level position. i.e., the position where the operating rod 301 is positioned when the movable baffle sheet 502 is just in contact with the fixing seat 307.

[0075] In some embodiments, a motion distance of the operating rod 301 is greater than a motion distance of the jacking rod 305 to realize the motion displacement reduction function of the driving mechanism 300. Therefore, the position of each level can be more clearly distinguished when the operating rod 301 is operated to move.

[0076] In some embodiments, the direct push valve 200 includes a valve body 201, internally provided with a gas inlet cavity 2011, a transition cavity 2012 and a gas outlet cavity 2013 in sequential connection, and including a gas inlet 2014 communicating with the gas inlet cavity 2011, and a gas outlet 2015 communicating with the gas outlet cavity 2013; a push rod 202, disposed in the gas outlet cavity 2013, and being capable of doing linear motion in an axial direction of the gas outlet cavity 2013; a middle sealing body 203, sleeving an end of the push rod 202 adjacent to the gas inlet cavity 2011; a first reset spring 204, sleeving the push rod 202 and positioned between the middle sealing body 203 and a tail portion of the push rod 202, an end of the push rod 202 adjacent to the jacking rod 305 forming the tail portion of the push rod 202, and the first reset spring 204 being capable of providing the push rod 202 with a tendency to always move in a direction leaving far away from the gas outlet cavity 2013; and an electromagnetic valve 205, disposed at an end of the valve body 201 adjacent to the gas inlet cavity 2011. The electromagnetic valve 205 includes a valve core 2051 capable of doing linear motion along an axial direction of the gas inlet cavity 2011, and a sealing block 2052 connected onto an end of the valve core 2051 adjacent to the gas outlet cavity 2013, and the sealing block 2052 is capable of separating the gas inlet cavity 2011 from the transition cavity 2012. The valve body 201 is internally provided with a first sealing ring 206 capable of forming fit sealing with the push rod 202, and the first sealing ring 206 is capable of separating the transition cavity 2012 from the gas outlet cavity 2013. The valve body 201 is internally provided with a low-level gas path passage 2016 capable of communicating the transition cavity 2012 with the gas outlet 2015, a low-level adjusting rod 207 is disposed in the low-level gas path passage 2016, and a circulation gap 208 is formed between the low-level adjusting rod 207 and an inner wall of the low-level gas path passage 2016. The low-level adjusting rod 207 is movably disposed in the low-level gas path passage 2016 to adjust the size of the circulation gap 208. Specifically, the first sealing ring 206 is disposed between the transition cavity 2012 and the gas outlet cavity 2013, and through the fit sealing of the push rod 202 and the first sealing ring 206, a gas flow entering from the gas inlet cavity 2011 can only flow to the gas outlet 2015 from the low-level gas path passage 2016. When the sealing of the push rod 202 and the first sealing ring 206 is removed, the gas flow entering from the gas inlet cavity 2011 can respectively flow to the gas outlet 2015 from the low-level gas path passage 2016, and flow to the gas outlet 2015 from the gas outlet cavity 2013. With these two paths for leading out the gas flow, a high-fire state can be achieved. In some embodiments, a second reset spring 2053 is disposed between the valve core 2051 and the sealing block 2052, and the second reset spring 2053 can provide the valve core 2051 with a tendency to always move in a direction approaching to the transition cavity 2012. By adopting the above solution, through the arrangement of the low-level gas path passage 2016, a low-level working state can be realized. Through the arrangement of the low-level adjusting rod 207 in the low-level gas path passage 2016, the low-level adjusting rod 207 can be adjusted according to requirements, so that the size of the circulation gap 208 between the low-level adjusting rod 207 and the inner wall of the low-level gas path passage 2016 can be adjusted, and further the flow rate flowing to the gas outlet 2015 can be adjusted.

[0077] In some embodiments, the valve body 201 is further provided with a standing pilot gas outlet 2019 communicating with the transition cavity 2012.

[0078] In some embodiments, the low-level gas path passage 2016 includes a low-level gas inlet passage 2016a communicating with the transition cavity 2012 and a low-level gas outlet passage 2016b communicating with the gas outlet 2015, and the low-level gas inlet passage 2016a intersects with the low-level gas outlet passage 2016b. The low-level gas inlet passage 2016a or the low-level gas outlet passage 2016b axially extends to form a low-level adjusting opening 2017, and the low-level adjusting rod 207 is disposed in the low-level adjusting opening 2017, and is capable of doing linear motion in an axial direction of the low-level adjusting opening 2017. The low-level adjusting rod 207 includes a first shaft portion 2071 and a second shaft portion 2072 in sequential connection in the axial direction of the low-level adjusting opening 2017, a shaft diameter of the first shaft portion 2071 is smaller than a shaft diameter of the second shaft portion 2072, a transition shaft portion 2073 is formed between the first shaft portion 2071 and the second shaft portion 2072, the first shaft portion 2071 is capable of extending into the low-level gas inlet passage 2016a or the low-level gas outlet passage 2016b, and the circulation gap 208 is formed between the transition shaft portion 2073 and an inner wall of the low-level gas path passage 2016. An outer surface of the transition shaft portion 2073 is a transition curve connected with outer surfaces of the first shaft portion 2071 and the second shaft portion 2072, so when the low-level adjusting rod 207 moves along the axial direction of the low-level adjusting opening 2017 in a direction leaving far away from the low-level gas inlet passage 2016a or the low-level gas outlet passage 2016b, the size of the circulation gap 208 increases. When the low-level adjusting rod 207 moves along the axial direction of the low-level adjusting opening 2017 in a direction approaching to the low-level gas inlet passage 2016a or the low-level gas outlet passage 2016b, the size of the circulation gap 208 decreases. In some embodiments, the low-level gas inlet passage 2016a is perpendicular to the low-level gas outlet passage 2016b. By adopting the above solution, in a process that the low-level adjusting rod 207 does linear motion in the axial direction of the low-level adjusting opening 2017, the size of the circulation gap 208 between the low-level adjusting rod 207 and the inner wall of the low-level gas path passage 2016 can be adjusted, and further the flow rate flowing to the gas outlet 2015 can be adjusted.

[0079] In some embodiments, a second sealing ring 209 is disposed between the low-level adjusting rod 207 and the low-level adjusting opening 2017, and the second sealing ring 209 and the low-level adjusting opening 2017 are in interference fit, so the sealing between the second sealing ring 209 and the low-level adjusting opening 2017 can be realized. The second sealing ring 209 and the low-level adjusting rod 207 are in interference fit, so the sealing between the second sealing ring 209 and the low-level adjusting rod 207 can be realized, and further the sealing between the low-level adjusting rod 207 and the low-level adjusting opening 2017 can be ensured to prevent gas flow leakage, realizing high safety. In some embodiments, the low-level adjusting rod 207 and the low-level adjusting opening 2017 are in threaded connection. A tail end of the low-level adjusting rod 207 is provided with a fit portion 2074 capable of being fit with an external structure, so that the low-level adjusting rod 207 can do linear motion in the axial direction of the low-level adjusting opening 2017, the fit portion 2074 includes structures such as a cross groove or a straight groove, and the low-level adjusting rod 207 can be conveniently screwed in or screwed out with a common screwdriver, so that the effect of adjusting the size of the circulation gap 208 formed between the low-level adjusting rod 207 and the low-level gas path passage 2016 can be realized, and the operation is convenient.

[0080] In some embodiments, the low-level gas outlet passage 2016b extends axially to form the low-level adjusting opening 2017. The low-level gas inlet passage 2016a extends axially to from a process hole 2018, and a plug 210 is fit in the process hole 2018. In some embodiments, the plug 210 includes a steel ball, the plug 210 and the process hole 2018 are in interference fit, after the plug 210 is assembled into the process hole 2018, the process hole 2018 may be sealed, thereby ensuring good sealing performance of the low-level gas path passage 2016. By adopting the above solution, the low-level gas path passage 2016 is formed through machining. Due to the process manufacturing, a process hole 2018 is generally formed. In order to plug the process hole 2018, the plug 210 is used to plug the process hole 2018 to ensure the sealing performance of the low-level gas path passage 2016.

[0081] In some embodiments, a head portion of the push rod 202 is provided with an inclined surface 2021 for guiding, so that the motion of the push rod 202 is smoother. Particularly, when the push rod 202 is fit to an inner hole of the first sealing ring 206, the inclined surface 2021 enables the push rod 202 to smoothly enter the inner hole without scratching the inner hole of the first sealing ring 206. A tail portion of the push rod 202 is of a round shaft structure, and an end of a tail portion of the push rod 202 adjacent to the middle sealing body 203 is provided with a notch 2022, so as to release a gas pressure in a space formed between the tail portion of the push rod 202 and the inner wall of the valve body 201. By adopting the above solution, when the push rod 202 does linear motion in the axial direction of the gas outlet cavity 2013, the tail portion of the push rod 202 cooperates with the inner wall of the valve body 201 to move. The gap between the tail portion of the push rod 202 and the inner wall of the valve body 201 is very small, and in use, the application of lubricating grease forms a sealed state between the tail portion of the push rod 202 and the inner wall of the valve body 201. Therefore, when the push rod 202 does linear motion, the gas pressure in the space formed between the tail portion of the push rod 202 and the inner wall of the valve body 201 also changes. Due to the formation of the notch 2022, the gas pressure in the space formed between the tail portion of the push rod 202 and the inner wall of the valve body 201 can be released, realizing high safety.

[0082] In some embodiments, the control system further includes a pilot burner device 600 and an ignition / shut-off control device 700, the pilot burner device 600 includes an ignition nozzle 601, an ignition needle 602, and a thermocouple 603, the ignition nozzle 601 is connected with a standing pilot gas outlet 2019 on the direct push valve 200, and the thermocouple 603 is connected with the electromagnetic valve 205. The thermocouple 603 generates thermoelectric potential under the effect of flames, and through the thermoelectric potential generated on the thermocouple 603, the electromagnetic valve 205 keeps an attraction state. The ignition / shut-off control device 700 includes an ignition limit switch 701, a shut-off limit switch 702 and an igniter 703, the ignition limit switch 701 is disposed in a position where the operating rod 301 moves downward to an ignition position and the driving mechanism 300 is capable of touching the ignition limit switch 701, and the shut-off limit switch 702 is disposed in a position where the operating rod 301 moves upward to a shut-off position and the driving mechanism 300 is capable of touching the shut-off limit switch 702. The igniter 703 is connected with the ignition needle 602, the ignition limit switch 701 is connected in series with the igniter 703 and the ignition needle 602, and the shut-off limit switch 702 is connected in series with the electromagnetic valve 205 and the thermocouple 603. In some embodiments, an ignition switch operating arm 3051 is disposed on the jacking rod 305, and when the operating rod 301 moves downward to the ignition position, the ignition switch operating arm 3051 is capable of touching the ignition limit switch 701. In some embodiments, the ignition limit switch 701 is relatively disposed above the jacking rod 305, an end of the jacking rod 305 adjacent to the ignition limit switch 701 is provided with an ignition switch operating arm 3051. In addition, when the operating rod 301 moves downward to the ignition position, the jacking rod 305 moves in the direction approaching to the push rod 202 until the ignition switch operating arm 3051 just triggers the ignition limit switch 701. In some embodiments, a shut-off switch operating arm 3031 is disposed on the rotating rod 303, and when the operating rod 301 moves upward to the shut-off position, the shut-off switch operating arm 3031 is capable of touching the shut-off limit switch 702. In some embodiments, the shut-off switch operating arm 3031 is disposed above the rotating rod 303, and the shut-off limit switch 702 is relatively disposed at an end of the rotating rod 303 adjacent to the push rod 202. When the operating rod 301 moves upward to the shut-off position, the rotating rod 303 rotates around the rotating shaft 103, so that the shut-off switch operating arm 3031 relatively moves downward to just trigger the shut-off limit switch 702.Working principle of the present invention:

[0083] The driving mechanism 300 is practically formed by a slider-crank mechanism and a crank-slider mechanism, the linear motion of the operating rod 301 in a vertical direction is converted and transferred into the linear motion of the jacking rod 305 in a horizontal direction, and the motion displacement distance is reduced to adapt to the stroke change of the push rod 202 of the direct push valve 200. The jacking rod 305 does the linear motion, and the axis of the push rod 202 of the direct push valve 200 keeps consistent with the motion direction of the jacking rod 305, so when pushing the push rod 202, the jacking rod 305 linearly pushes the push rod 202, without relative displacement between the jacking rod 305 and the push rod 202. As a result, the operation on the direct push valve 200 is smoother, no abrasion is caused on the push rod 202, and the service life of the direct push valve 200 is prolonged.

[0084] The direct push valve 200 is a direct push valve 200 with an adjustable low-level flow rate passage, which not only realizes the high-level and low-level gas supply states conveniently, but also allow the adjustment of the low-level flow rate to adapt to the requirements of the low-level flame sizes of different products.

[0085] Through the low-level buffer reset device and the high-level buffer reset device, the operating rod 301 can automatically return to the low-level position or the high-level position, so the user can easily set the gas fireplace to the low-level position or the high-level position.

[0086] Ignition: when the user presses and operates the operating handle 3013 and fully presses the handle, the operating rod 301 moves downward, the jacking rod 305 moves in a direction towards the direct push valve 200 until the push rod 202 is pushed to move in a direction approaching to the gas inlet cavity 2011, and the sealing block 2052 is pushed so that the electromagnetic valve 205 is in an attraction position, the second reset spring 2053 is compressed, and the first reset spring 204 is compressed. At this moment, the gas inlet cavity 2011 communicates with the standing pilot gas outlet 2019, the gas can enter the ignition nozzle 601 of the pilot burner device 600 through the gas inlet cavity 2011 of the direct push valve 200. In addition, at this moment, the ignition switch operating arm 3051 triggers the ignition limit switch 701 to control the igniter 703 to perform discharging ignition on the ignition needle 602. Moreover, in the ignition state, the low-level buffer spring 403 is in a compressed state under the acting force of the operating rod 301.

[0087] Low level: after the flame is ignited, the user may release the acting force applied to the operating handle 3013, the operating rod 301 automatically moves upward under the resilience force of the low-level buffer spring 403, further driving the jacking rod 305 to move in the direction leaving far away from the direct push valve 200. At this moment, under the resilience force of the first reset spring 204, the push rod 202 moves in a direction leaving far away from the gas inlet cavity 2011, until an outer circumference surface of the push rod 202 near the head portion is about to be out of contact with the first sealing ring 206, the low-level buffer sliding rod 402 and the low-level buffer operating arm 3012 are just in a disconnecting critical point, and at this moment, the outer circumference surface of the push rod 202 near the head portion and the first sealing ring 206 are in a sealed state. After entering the transition cavity 2012, the gas of the gas inlet cavity 2011 may enter the gas outlet 2015 through the low-level gas path passage 2016 to burn in a gas fireplace burner, achieving the low-flow rate state. The thermocouple 603 generates thermoelectric potential under the action of the flame, and the generated thermoelectric potential can keep the electromagnetic valve 205 to be in an attraction state.

[0088] High level: in the low-level state, the user operates the operating handle 3013 to lift the operating rod 301 upward, the jacking rod 305 is further driven to continue to move in a direction leaving far away from the direct push valve 200 until the movable baffle sheet 502 is just in contact with the fixing seat 307, reaching the high-level position, and at this moment, if the operating rod 301 is continuously lifted upward, under the action of the high-level reset spring, the resistance is obviously increased to remind the user that the operating rod 301 has been in the high-level position. Even if the user applies an excessive force, and the operating rod 301 slightly exceeds the high-level position, the operating rod 301 will return to the high-level position under the resilience force of the high-level reset spring as along as the acting force applied to the operating handle 3013 is removed. During the transition from the low-level position to the high-level position, under the action of the first reset spring 204, the push rod 202 continues to move in a direction leaving far away from the gas inlet cavity 2011, the outer circumference surface of the push rod 202 near the head portion is out of contact with the first sealing ring 206, the transition cavity 2012 communicates with the gas outlet cavity 2013, and the gas in the transition cavity 2012 can enter the gas outlet 2015 through the gas outlet cavity 2013. In addition, a diameter of the gas path is greater than a diameter of the low-level gas path passage 2016, a larger gas flow is formed to flow to the gas outlet 2015, reaching the high-level flow rate state, and the flame of the gas fireplace is in a high-level size state.

[0089] Shut-off: in the high-level state, the user can continuously lift the operating rod 301 upward to overcome the acting force of the high-level reset spring to reach the shut-off position, at this moment, the shut-off switch operating arm 3031 acts on the shut-off limit switch 702, disconnecting the thermocouple 603 from the electromagnetic valve 205. As a result, the electromagnetic valve 205 cannot receive the thermoelectric potential generated on the thermocouple 603, and then the electromagnetic valve 205 cannot keep the attraction state. Under the action of the second reset spring 2053, the sealing block 2052 seals and isolates the gas inlet cavity 2011 and the transition cavity 2012, and the direct push valve 200 is in a closed state, so the shut-off operation is realized.

[0090] Reset: in the shut-off state, when the acting force applied to the operating rod 301 is removed, under the action of the high-level reset spring, the operating rod 301 is driven by the jacking rod 305 to return to the high-level position. However, at this moment, the direct push valve 200 is in the closed state, so the gas fireplace is also in a shut-off state. That is, at this moment, the gas fireplace is in a standby reset state.

[0091] For the same or similar parts between the embodiments in the specification, reference may be made to each other. Each embodiment focuses on its differences from other embodiments.

[0092] The foregoing descriptions are merely specific implementations of the present invention, but are not intended to limit the protection scope of the present invention. Any variation or replacement readily conceived by a person skilled in the art within the technical scope disclosed in the present invention shall fall within the protection scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.

Examples

Embodiment Construction

[0065]Specific implementations of the present invention will further be described below in combination with the drawings and embodiments in detail. The following embodiments are adopted to describe the present invention rather than limit the scope of the present invention.

[0066]In the description of the present invention, it should be noted that unless otherwise clearly defined and limited, terms "install", "interconnect" and "connect" should be understood in a broad sense, for example, it may be connected in a fixed, detachable or integrated manner; it may be mechanically or electrically connected; it may be directly connected or indirectly connected via an intermediate media; and it may be communication between two elements. For a person of ordinary skill in the art, the specific meanings of the above terms in the present invention may be understood according to specific conditions.

[0067]The implementations of the present invention will be described below with reference to specifi...

Claims

1. A control system for a gas fireplace, comprising: a housing (100); a direct push valve (200), disposed on the housing (100) and comprising a valve body (201) and a push rod (202) disposed along an axis of the valve body (201); and a driving mechanism (300), disposed on the housing (100) and being capable of driving the push rod (202) to do linear motion along the axis of the valve body (201), wherein the driving mechanism (300) comprises an operating rod (301) doing linear motion along the housing (100), a first connecting rod (302) hinged to a bottom end of the operating rod (301), a rotating rod (303) hinged to the other end of the first connecting rod (302), a second connecting rod (304) hinged to the other end of the rotating rod (303), and a jacking rod (305) hinged to the other end of the second connecting rod (304), a rotating shaft (103) is disposed on the housing (100), the rotating rod (303) is capable of rotating around the rotating shaft (103), the jacking rod (305) is capable of doing linear motion along the axis of the valve body (201), when the operating rod (301) does linear motion in a first direction, the jacking rod (305) is pushed to do linear motion along the axis of the valve body (201), and when the jacking rod (305) does linear motion along the axis of the valve body (201), the push rod (202) is pushed to do linear motion along the axis of the valve body (201).

2. The control system for a gas fireplace according to claim 1, wherein a motion direction of the operating rod (301) is perpendicular to a motion direction of the jacking rod (305).

3. The control system for a gas fireplace according to claim 1, wherein the driving mechanism (300) further comprises a guide post (306) and a fixing seat (307) that are fixedly disposed on the housing (100), the guide post (306) is disposed in a motion stroke of the operating rod (301), the operating rod (301) is provided, in the motion direction, with a guide groove (3011) fit with the guide post (306), the fixing seat (307) is provided with a first through hole (3071) in an axis direction of the valve body (201), the jacking rod (305) is fit in the first through hole (3071), and the jacking rod (305) is capable of doing linear motion along the first through hole (3071).

4. The control system for a gas fireplace according to claim 1, wherein the direct push valve (200) has a low-level state for the gas flow supplied to the gas fireplace; after the operating rod (301) moves downward, the operating rod (301) drives the jacking rod (305) to approach to the push rod (202) along the axis of the valve body (201), and pushes the push rod (202) to move along the axis of the valve body (201) in a direction approaching to the valve body (201) to a low-level position, and at this moment, the direct push valve (200) is in the low-level state for the gas flow supplied to the gas fireplace.

5. The control system for a gas fireplace according to claim 4, wherein a low-level buffer positioning device (400) is disposed between the operating rod (301) and the housing (100), and when the operating rod (301) moves downward until the direct push valve (200) is in the low-level state, the operating rod (301) is just in contact with the low-level buffer positioning device (400).

6. The control system for a gas fireplace according to claim 5, wherein the low-level buffer positioning device (400) comprises a low-level buffer fixing block (401), a low-level buffer sliding rod (402), and a low-level buffer spring (403), the low-level buffer fixing block (401) is fixedly disposed relative to the housing (100), and the low-level buffer fixing block (401) is provided with a second through hole (4011) in a motion direction of the operating rod (301); the low-level buffer sliding rod (402) is fit in the second through hole (4011), and the low-level buffer sliding rod (402) is capable of doing linear motion along the second through hole (4011); the operating rod (301) is disposed at a top end of the low-level buffer sliding rod (402), and when the operating rod (301) moves downward to contact with the top end of the low-level buffer sliding rod (402), the direct push valve (200) is in the low-level position; and an end of the low-level buffer sliding rod (402) far away from the operating rod (301) is provided with a stop baffle block (4021) capable of abutting against a bottom end of the low-level buffer fixing block (401), an end of the low-level buffer sliding rod (402) adjacent to the operating rod (301) is provided with a low-level buffer spring baffle sheet (4022), the low-level buffer spring (403) sleeves the low-level buffer sliding rod (402), with one end being abutted against the low-level buffer spring baffle sheet (4022), and the other end being abutted against a top end of the low-level buffer fixing block (401), and the low-level buffer spring (403) is capable of providing the low-level buffer sliding rod (402) with a tendency to always move in a direction approaching to the operating rod (301).

7. The control system for a gas fireplace according to claim 6, wherein an end of the operating rod (301) adjacent to the low-level buffer sliding rod (402) is provided with a low-level buffer operating arm (3012), and an end of the low-level buffer sliding rod (402) adjacent to the operating rod (301) is provided with a ball head (4023); and when the operating rod (301) moves downward until the direct push valve (200) is in the low-level position, the low-level buffer operating arm (3012) is in contact with the ball head (4023).

8. The control system for a gas fireplace according to claim 3, wherein the direct push valve (200) has a high-level state for the gas flow supplied to the gas fireplace; after the operating rod (301) moves upward, the operating rod (301) drives the jacking rod (305) to leave far away from the push rod (202) along the axis of the valve body (201), the push rod (202) returns to the high-level position along the axis of the valve body (201) in a direction leaving far away from the valve body (201), and at this moment, the direct push valve (200) is in the high-level state for the gas flow supplied to the gas fireplace.

9. The control system for a gas fireplace according to claim 8, wherein a high-level buffer positioning device (500) is disposed between the jacking rod (305) and the fixing seat (307), and when the operating rod (301) moves upward until the direct push valve (200) is in the high-level state, the high-level buffer positioning device (500) is just in contact with the fixing seat (307).

10. The control system for a gas fireplace according to claim 9, wherein the high-level buffer positioning device (500) comprises a high-level buffer baffle sheet (501) clamped on an end of the jacking rod (305) adjacent to the push rod (202), a movable baffle sheet (502) sleeving an end of the jacking rod (305) adjacent to the fixing seat (307), and a high-level buffer spring (503) sleeving the jacking rod (305); one end of the high-level buffer spring (503) is abutted against the high-level buffer baffle sheet (501), and the other end is abutted against the movable baffle sheet (502); the operating rod (301) moves upward and drives the jacking rod (305) to move until the movable baffle sheet (502) is in contact with the fixing seat (307), and at this time, the direct push valve (200) is in the high-level position; and the high-level buffer spring (503) is capable of providing the jacking rod (305) with tendency to always move in a direction approaching to the push rod (202).

11. The control system for a gas fireplace according to claim 1, wherein a motion distance of the operating rod (301) is greater than a motion distance of the jacking rod (305).

12. The control system for a gas fireplace according to claim 1, wherein the direct push valve (200) comprises: a valve body (201), internally provided with a gas inlet cavity (2011), a transition cavity (2012) and a gas outlet cavity (2013) in sequential connection, and comprising a gas inlet (2014) communicating with the gas inlet cavity (2011), and a gas outlet (2015) communicating with the gas outlet cavity (2013); a push rod (202), disposed in the gas outlet cavity (2013), and being capable of doing linear motion in an axial direction of the gas outlet cavity (2013); a middle sealing body (203), sleeving an end of the push rod (202) adjacent to the gas inlet cavity (2011); a first reset spring (204), sleeving the push rod (202) and positioned between the middle sealing body (203) and a tail portion of the push rod (202), an end of the push rod (202) adjacent to the jacking rod (305) forming the tail portion of the push rod (202), and the first reset spring (204) being capable of providing the push rod (202) a tendency to always move in a direction leaving far away from the gas outlet cavity (2013); and an electromagnetic valve (205), disposed at an end of the valve body (201) adjacent to the gas inlet cavity (2011), and comprising a valve core (2051) capable of doing linear motion along an axial direction of the gas inlet cavity (2011), and a sealing block (2052) connected onto an end of the valve core (2051) adjacent to the gas outlet cavity (2013), and the sealing block (2052) being capable of separating the gas inlet cavity (2011) from the transition cavity (2012), wherein the valve body (201) is internally provided with a first sealing ring (206) capable of forming fit sealing with the push rod (202), and the first sealing ring (206) is capable of separating the transition cavity (2012) from the gas outlet cavity (2013); the valve body (201) is internally provided with a low-level gas path passage (2016) capable of communicating the transition cavity (2012) with the gas outlet (2015), a low-level adjusting rod (207) is disposed in the low-level gas path passage (2016), and a circulation gap (208) is formed between the low-level adjusting rod (207) and an inner wall of the low-level gas path passage (2016); and the low-level adjusting rod (207) is movably disposed in the low-level gas path passage (2016) to adjust the size of the circulation gap (208).

13. The control system for a gas fireplace according to claim 12, wherein the low-level gas path passage (2016) comprises a low-level gas inlet passage (2016a) communicating with the transition cavity (2012) and a low-level gas outlet passage (2016b) communicating with the gas outlet (2015), and the low-level gas inlet passage (2016a) intersects with the low-level gas outlet passage (2016b); the low-level gas inlet passage (2016a) or the low-level gas outlet passage (2016b) axially extends to form a low-level adjusting opening (2017), and the low-level adjusting rod (207) is disposed in the low-level adjusting opening (2017), and is capable of doing linear motion in an axial direction of the low-level adjusting opening (2017); the low-level adjusting rod (207) comprises a first shaft portion (2071) and a second shaft portion (2072) in sequential connection in the axial direction of the low-level adjusting opening (2017), a shaft diameter of the first shaft portion (2071) is smaller than a shaft diameter of the second shaft portion (2072), a transition shaft portion (2073) is formed between the first shaft portion (2071) and the second shaft portion (2072), the first shaft portion (2071) is capable of extending into the low-level gas inlet passage (2016a) or the low-level gas outlet passage (2016b), and the circulation gap (208) is formed between the transition shaft portion (2073) and an inner wall of the low-level gas path passage (2016); an outer surface of the transition shaft portion (2073) is a transition curve connected with outer surfaces of the first shaft portion (2071) and the second shaft portion (2072), so when the low-level adjusting rod (207) moves along the axial direction of the low-level adjusting opening (2017) in a direction leaving far away from the low-level gas inlet passage (2016a) or the low-level gas outlet passage (2016b), the size of the circulation gap (208) increases; and when the low-level adjusting rod (207) moves along the axial direction of the low-level adjusting opening (2017) in a direction approaching to the low-level gas inlet passage (2016a) or the low-level gas outlet passage (2016b), the size of the circulation gap (208) decreases.

14. The control system for a gas fireplace according to claim 13, wherein a second sealing ring (209) is disposed between the low-level adjusting rod (207) and the low-level adjusting opening (2017), the second sealing ring (209) and the low-level adjusting rod (207) are in interference fit, and the second sealing ring (209) and the low-level adjusting opening (2017) are in interference fit; and the low-level adjusting rod (207) and the low-level adjusting opening (2017) are in threaded connection.

15. The control system for a gas fireplace according to claim 13, wherein one of the low-level gas inlet passage (2016a) and the low-level gas outlet passage (2016b) extends axially to form the low-level adjusting opening (2017); and the other one of the low-level gas inlet passage (2016a) and the low-level gas outlet passage (2016b) extends axially to from a process hole (2018), and a plug (210) is fit in the process hole (2018).

16. The control system for a gas fireplace according to claim 1, further comprising a pilot burner device (600) and an ignition / shut-off control device (700), wherein the pilot burner device (600) comprises an ignition nozzle (601), an ignition needle (602), and a thermocouple (603), the ignition nozzle (601) is connected with a standing pilot gas outlet (2019) on the direct push valve (200), and the thermocouple (603) is connected with the electromagnetic valve (205) on the direct push valve (200); the ignition / shut-off control device (700) comprises an ignition limit switch (701), a shut-off limit switch (702) and an igniter (703), the ignition limit switch (701) is disposed in a position where the operating rod (301) moves downward to an ignition position and the driving mechanism (300) is capable of touching the ignition limit switch (701), and the shut-off limit switch (702) is disposed in a position where the operating rod (301) moves upward to a shut-off position and the driving mechanism (300) is capable of touching the shut-off limit switch (702); and the igniter (703) is connected with the ignition needle (602), the ignition limit switch (701) is connected in series with the igniter (703) and the ignition needle (602), and the shut-off limit switch (702) is connected in series with the electromagnetic valve (205) and the thermocouple (603).

17. The control system for a gas fireplace according to claim 16, wherein an ignition switch operating arm (3051) is disposed on the jacking rod (305), and when the operating rod (301) moves downward to the ignition position, the ignition switch operating arm (3051) is capable of touching the ignition limit switch (701).

18. The control system for a gas fireplace according to claim 16, wherein a shut-off switch operating arm (3031) is disposed on the rotating rod (303), and when the operating rod (301) moves upward to the shut-off position, the shut-off switch operating arm (3031) is capable of touching the shut-off limit switch (702).

Images