Gas valve with adjustable low-flow channel

Abstract

The present invention discloses a gas valve with an adjustable low-flow channel. The gas valve includes: a valve body, where a gas inlet cavity, a transition cavity, and a gas outlet cavity which are sequentially connected are formed in the valve body, and the valve body includes a gas outlet communicated with the gas outlet cavity; a push rod, arranged in the gas outlet cavity and capable of linearly moving along an axial direction of the gas outlet cavity; a solenoid valve, arranged at one end of the valve body close to the gas inlet cavity. The solenoid valve includes a valve core capable of linearly moving along an axial direction of the gas inlet cavity and a sealing block connected to the valve core. The sealing block is configured to separate the gas inlet cavity from the transition cavity. A first sealing ring configured to hermetically engage with the push rod is arranged in the valve body, and the first sealing ring is configured to separate the transition cavity from the gas outlet cavity. A low-flow gas channel communicating the transition cavity and the gas outlet is formed in the valve body. A low-flow adjusting rod is arranged in the low-flow gas channel, and a flow gap is formed between the low-flow adjusting rod and an inner wall of the low-flow gas channel. The low-flow adjusting rod is movably arranged in the low-flow gas channel to adjust a size of the flow gap.

Description

Technical Field

[0001] The present invention relates to the technical field of gas valves, and in particular, to a gas valve with an adjustable low-flow channel.Background

[0002] As a heating appliance that utilizes clean energy, a gas fireplace is favored by consumers not only for its ability to achieve a sufficient heating effect, but also for offering a realistic flame for visual enjoyment. As a decorative gas appliance, the gas fireplace typically requires a valve to control the supply and on-off of gas. Moreover, for mounting and layout considerations, in most cases, a direct-acting valve with axial linear movement is adopted.

[0003] However, most direct-acting valves currently available on the market do not have a flow adjustment function and operate only in two states: open and closed. Even for certain valves that offer both low-flow and high-flow operating states, such as a gas valve disclosed in Chinese Patent No. CN201520987032.5, a low-flow channel is fixed within the valve and cannot be adjusted once valve assembly is completed. However, in some cases, the required low flow varies depending on different product requirements, making the valve inconvenient to use.Summary (I) Technical problem to be solved

[0004] The technical problem to be solved by the present invention is to provide a gas valve with an adjustable low-flow channel. By providing a low-flow gas channel, the valve may operate in a low-flow state; and a low-flow adjusting rod is arranged in the low-flow gas channel to adjust a flow as needed.(II) Technical solution

[0005] To solve the above technical problem, a technical solution of the present invention provides a gas valve with an adjustable low-flow channel. The gas valve includes: a valve body, where a gas inlet cavity, a transition cavity, and a gas outlet cavity which are sequentially connected are formed in the valve body, and the valve body includes a gas inlet communicated with the gas inlet cavity and a gas outlet communicated with the gas outlet cavity; a push rod, arranged in the gas outlet cavity and capable of linearly moving along an axial direction of the gas outlet cavity; and a solenoid valve, arranged at one end of the valve body close to the gas inlet cavity, where the solenoid valve includes a valve core capable of linearly moving along an axial direction of the gas inlet cavity and a sealing block connected to one end of the valve core close to the gas outlet cavity, and the sealing block is configured to separate the gas inlet cavity from the transition cavity.

[0006] A first sealing ring configured to hermetically engage with the push rod is arranged in the valve body, and the first sealing ring is configured to separate the transition cavity from the gas outlet cavity. A low-flow gas channel communicating the transition cavity and the gas outlet is formed in the valve body. A low-flow adjusting rod is arranged in the low-flow gas channel, and a flow gap is formed between the low-flow adjusting rod and an inner wall of the low-flow gas channel. The low-flow adjusting rod is movably arranged in the low-flow gas channel to adjust a size of the flow gap.

[0007] Specifically, the first sealing ring is arranged between the transition cavity and the gas outlet cavity. The push rod hermetically engages with the first sealing ring, ensuring that a gas flow entering the gas inlet cavity may only flow through the low-flow gas channel to the gas outlet. When a seal between the push rod and the first sealing ring is released, the gas flow entering the gas inlet cavity may flow through both the low-flow gas channel to the gas outlet and through the gas outlet cavity to the gas outlet, thereby achieving a big fire state by creating two channels for leading out the gas flow.

[0008] According to the above-mentioned technical solution of the present invention, a low-flow operating state may be achieved by arranging the low-flow gas channel. By arranging the low-flow adjusting rod within the low-flow gas channel, the low-flow adjusting rod may be adjusted as needed to adjust the size of the flow gap between the low-flow adjusting rod and the inner wall of the low-flow gas channel, thereby adjusting the gas flow that flows toward the gas outlet.

[0009] In some embodiments, the low-flow gas channel includes a low-flow gas inlet channel communicated with the transition cavity and a low-flow gas outlet channel communicated with the gas outlet. The low-flow gas inlet channel intersects with the low-flow gas outlet channel. The low-flow gas inlet channel or the low-flow gas outlet channel extends along an axial direction to form a low-flow adjusting port. The low-flow adjusting rod is arranged in the low-flow adjusting port and is capable of linearly moving along an axial direction of the low-flow adjusting port.

[0010] In some embodiments, the low-flow gas inlet channel is perpendicular to the low-flow gas outlet channel.

[0011] According to the above-mentioned technical solution of the present invention, as the low-flow adjusting rod linearly moves along the axial direction of the low-flow adjusting port, the size of the flow gap between the low-flow adjusting rod and the inner wall of the low-flow gas channel may be adjusted, thereby adjusting the gas flow that flows toward the gas outlet.

[0012] In some embodiments, the low-flow adjusting rod includes a first shaft portion and a second shaft portion sequentially connected along the axial direction of the low-flow adjusting port. A shaft diameter of the first shaft portion is smaller than that of the second shaft portion, and a transition shaft portion is formed between the first shaft portion and the second shaft portion. The first shaft portion is configured to extend into the low-flow gas inlet channel or the low-flow gas outlet channel, and the flow gap is formed between the transition shaft portion and the inner wall of the low-flow gas channel. Since an outer surface of the transition shaft portion is a transitional curved surface connecting an outer surface of the first shaft portion with an outer surface of the second shaft portion, when the low-flow adjusting rod moves away from the low-flow gas inlet channel or the low-flow gas outlet channel along the axial direction of the low-flow adjusting port, the size of the flow gap is changed from small to large; and when the low-flow adjusting rod moves close to the low-flow gas inlet channel or the low-flow gas outlet channel along the axial direction of the low-flow adjusting port, the size of the flow gap is changed from large to small.

[0013] In some embodiments, a second sealing ring is arranged between the low-flow adjusting rod and the low-flow adjusting port.

[0014] In some embodiments, the low-flow adjusting rod includes a third shaft portion arranged at one end of the second shaft portion away from the transition shaft portion. A shaft diameter of the third shaft portion is larger than that of the second shaft portion, and an outer wall of the third shaft portion abuts against an inner wall of the low-flow adjusting port. An annular groove is formed in the third shaft portion, and the second sealing ring is embedded in the annular groove. The second sealing ring is in interference fit with the low-flow adjusting port to achieve a seal between the second sealing ring and the low-flow adjusting port, and the second sealing ring is in interference fit with the annular groove to achieve a seal between the second sealing ring and the low-flow adjusting rod, thereby ensuring a seal between the low-flow adjusting rod and the low-flow adjusting port to prevent gas leakage and ensure high safety. Moreover, since the second sealing ring is embedded in the annular groove of the low-flow adjusting rod, the second sealing ring moves synchronously with the low-flow adjusting rod, thereby preventing the second sealing ring from disengaging from the low-flow adjusting rod and further ensuring the seal between the low-flow adjusting rod and the low-flow adjusting port.

[0015] In some embodiments, an engagement portion configured to engage with an external structure is provided at a tail end of the low-flow adjusting rod, such that the low-flow adjusting rod is capable of linearly moving along the axial direction of the low-flow adjusting port.

[0016] In some embodiments, the low-flow adjusting rod is in threaded connection with the low-flow adjusting port. The engagement portion includes structures such as a cross recess or a slotted groove, allowing the low-flow adjusting rod to be easily screwed in or out by using a common screwdriver, thereby adjusting the size of the flow gap formed between the low-flow adjusting rod and the low-flow gas channel, which is convenient to operate.

[0017] In some embodiments, one of the low-flow gas inlet channel and the low-flow gas outlet channel extends along the axial direction to form the low-flow adjusting port; and the other one of the low-flow gas inlet channel and the low-flow gas outlet channel extends along the axial direction to form a process hole, and a plug is fitted in the process hole.

[0018] In some embodiments, the plug includes a steel ball, and the plug is in interference fit with the process hole. Once the plug is assembled into the process hole, the process hole may be sealed, thereby ensuring good gas tightness of the low-flow gas channel.

[0019] According to the above-mentioned technical solution of the present invention, the low-flow gas channel is formed through machining, and due to a manufacturing process, the process hole is typically formed. To seal the process hole, the plug is used for blocking the process hole, thereby ensuring the gas tightness of the low-flow gas channel.

[0020] In some embodiments, the transition cavity is positioned between the gas inlet cavity and the gas outlet cavity, with the gas inlet cavity, the transition cavity, and the gas outlet cavity being in communication with each other. The low-flow gas channel may communicate the transition cavity and the gas outlet. The sealing block is configured to separate the gas inlet cavity from the transition cavity.

[0021] In some embodiments, the valve body is further provided with a pilot light gas outlet communicated with the transition cavity.

[0022] In some embodiments, the gas valve further includes an intermediate sealing member and a first return spring, both sleeve the push rod. The first return spring is arranged between the intermediate sealing member and a tail portion of the push rod. The tail portion of the push rod is provided at one end of the push rod away from the gas outlet cavity. The first return spring is configured to bias the push rod continuously in a direction away from the gas outlet cavity. Furthermore, the valve body is provided with the first sealing ring between the transition cavity and the gas outlet cavity. The push rod is capable of hermetically engaging with the first sealing ring, thereby separating the transition cavity from the gas outlet cavity.

[0023] In some embodiments, a head portion of the push rod is provided with an inclined plane to achieve a guidance effect, ensuring a smoother movement of the push rod, and especially when the push rod is fitted into an inner hole of the first sealing ring, the push rod may enter the inner hole smoothly through the inclined plane without scratching the inner hole of the first sealing ring. The tail portion of the push rod has a round shaft structure, and a notch is formed in one end of the tail portion of the push rod close to the intermediate sealing member to release a pneumatic pressure within a space formed between the tail portion of the push rod and an inner wall of the valve body.

[0024] According to the above-mentioned technical solution of the present invention, when the push rod linearly moves along the axial direction of the gas outlet cavity, the tail portion of the push rod moves in conjunction with the inner wall of the valve body. Since a gap between the tail portion of the push rod and the inner wall of the valve body is relatively small, and during operation, a sealing state is formed between the tail portion of the push rod and the inner wall of the valve body due to the action of lubricating grease, as the push rod moves linearly, the pneumatic pressure within the space formed between the tail portion of the push rod and the inner wall of the valve body also changes. Due to the formulation of the notch, the pneumatic pressure within the space formed between the tail portion of the push rod and the inner wall of the valve body may be released, ensuring high safety.

[0025] In some embodiments, a second return spring is arranged between the valve core and the sealing block, and the second return spring is configured to bias the valve core continuously in a direction close to the transition cavity.

[0026] The operating principles of the present invention are as follows: Closed state: When no external acting force is applied to the push rod, the push rod is held, under the action of the first return spring, in a state furthest away from the gas inlet cavity; and the valve core of the solenoid valve, under the action of the second return spring, drives the sealing block to hermetically isolate the gas inlet cavity from the transition cavity, such that the gas inlet cavity becomes a sealed space, and at this time, the gas valve is at the closed state. Ignition state: The push rod is actuated in an appropriate way to move close to the gas inlet cavity along the axial direction of the gas outlet cavity, until the head portion of the push rod pushes against the sealing block to allow the solenoid valve to reach a pick-up position and compress the second return spring. As a result, the gas inlet cavity is communicated with the transition cavity, and the transition cavity is further communicated with the pilot light gas outlet, thereby achieving ignition. Low-flow state: After a flame is ignited, thermoelectric potential is generated by an external thermocouple under the action of the flame, and the generated thermoelectric potential may keep the solenoid valve in a pick-up state. Once the flame is ignited, the push rod is released, and the push rod, under the action of the first return spring, moves away from the gas inlet cavity along the axial direction of the gas outlet cavity. Before the push rod disengages from the first sealing ring, sealing between the push rod and the first sealing ring remains effective. Since the gas inlet cavity is communicated with the transition cavity, and the transition cavity is communicated with the low-flow gas channel, gas from the gas inlet cavity flows into the transition cavity and subsequently flows from the low-flow gas channel to the gas outlet for supplying fuel to a burner of a gas fireplace, which corresponds to the low-flow state. High-flow state: After the low-flow state is activated, the continued release of the push rod allows the push rod, under the action of the first return spring, to keep moving away from the gas inlet cavity along the axial direction of the gas outlet cavity until the push rod disengages from the first sealing ring, at this time, the transition cavity is communicated with the gas outlet cavity. As a result, the gas from the gas inlet cavity flows into the transition cavity and then flows into the gas outlet through the gas outlet cavity. Additionally, an aperture of a gas channel is far larger than that of the low-flow gas channel, such that a greater volume of gas is formed to flow toward the master gas outlet, which corresponds to the high-flow state.

[0027] A tail portion of the low-flow adjusting port is communicated with an external environment, namely the tail end of the low-flow adjusting rod is communicated with an outside of the valve body. This allows for an easy adjustment of a depth at which the low-flow adjusting rod is screwed into the low-flow adjusting port with an appropriate tool. As a result, the size of the flow gap formed between the low-flow adjusting rod and the low-flow gas channel may be adjusted, thereby adjusting the gas flow from the low-flow gas channel to the gas outlet.(III) Beneficial effects

[0028] Compared to the prior art, the present invention designs a gas valve with an adjustable low-flow channel; (1) according to the present invention, the low-flow operating state can be achieved by the low-flow gas channel. By arranging the low-flow adjusting rod within the low-flow gas channel, the low-flow adjusting rod can be adjusted as needed to adjust the size of the flow gap between the low-flow adjusting rod and the inner wall of the low-flow gas channel, thereby adjusting the gas flow that flows toward the gas outlet. The gas valve is simple in structure and convenient to adjust, and can meet varying low-flow requirements of different products, offering broader adaptability; and (2) according to the present invention, before the push rod disengages from the first sealing ring, the transition cavity is communicated with the gas outlet only through the low-flow gas channel; a low-flow position of the push rod is wider, and even if the positioning is not perfectly accurate during the release of the push rod, the stable and required low flow can still be achieved. Brief Description of Figures

[0029] To describe the technical solutions of the embodiments of this application 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 this application, and a person of ordinary skill in the art may still derive other drawings from these accompanying drawings without creative efforts. FIG. 1 is an axonometric cross-sectional view illustrating a gas valve with an adjustable low-flow channel according to Embodiment 1; FIG. 2 is an enlarged schematic diagram at Part A in FIG. 1; FIG. 3 is an exploded cross-sectional view illustrating a gas valve with an adjustable low-flow channel according to Embodiment 1; FIG. 4 is an exploded stereoscopic view illustrating a gas valve with an adjustable low-flow channel according to Embodiment 1; FIG. 5 is a cross-sectional view illustrating a gas valve with an adjustable low-flow channel in a closed state according to Embodiment 1; FIG. 6 is an enlarged schematic diagram at Part B in FIG. 5; FIG. 7 is a cross-sectional view illustrating a gas valve with an adjustable low-flow channel in an ignition state according to Embodiment 1; FIG. 8 is a cross-sectional view illustrating a gas valve with an adjustable low-flow channel in a low-flow state according to Embodiment 1; FIG. 9 is a cross-sectional view illustrating a gas valve with an adjustable low-flow channel in a high-flow state according to Embodiment 1; and FIG. 10 is a cross-sectional view illustrating a gas valve with an adjustable low-flow channel in a closed state according to Embodiment 2.

[0030] Component names corresponding to reference signs in the figures are as follows: 100. valve body, 101. gas inlet cavity; 102. gas outlet cavity; 103. gas inlet; 104. gas outlet; 105. low-flow gas channel; 105a. low-flow gas inlet channel; 105b. low-flow gas outlet channel; 106. low-flow adjusting port; 107. process hole; 108. transition cavity; 109. pilot light gas outlet; 110. first sealing ring; 200. push rod; 201. intermediate sealing member; 202. first return spring; 203. tail portion of push rod; 204. head portion of push rod; 205. inclined plane; 206. notch; 300. solenoid valve; 301. valve core; 302. sealing block; 303. second return spring; 400. low-flow adjusting rod; 401. first shaft portion; 402. second shaft portion; 403. transition shaft portion; 404. tail end of low-flow adjusting rod; 404a. engagement portion; 405. third shaft portion; 405a. annular groove; 500. flow gap; 600. second sealing ring; and 700. plug.Detailed Description

[0031] The specific implementations of the present invention will be described in further detail below with reference to the accompanying drawings and embodiments. The following embodiments are intended to illustrate the present invention, but are not intended to limit the scope of the present invention.

[0032] In the description of the present invention, it should be noted that unless otherwise explicitly specified or defined, the terms such as "mount", "connect", and "connection" should be understood in a broad sense. For example, the connection may be a fixed connection, a detachable connection, or an integral connection; or the connection may be a mechanical connection or an electrical connection; or the connection may be a direct connection, an indirect connection through an intermediary, or internal communication between two elements. For those of ordinary skill in the art, the specific meanings of the aforementioned terms in the present invention can be understood according to specific conditions.

[0033] 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 apparent that the described embodiments are only some, but not all, embodiments of this application. This application may also be implemented or applied through other different specific implementations. Various modifications or changes may also be made on the details in the present specification without departing from the spirit of this application 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. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of this application without making any inventive labor still fall within the scope of protection of this application.

[0034] It should be noted that various aspects of the embodiments within the scope of the following claims are described below. It should be apparent that the aspects described herein may be embodied in a wide variety of forms and that any specific structure and / or function described herein is merely illustrative. Based on this application, a person skilled in the art should appreciate that one aspect described herein may be implemented independently of any other aspect, and that two or more of these aspects may be combined in various ways. For example, apparatuses and / or methods may be implemented using any number and aspects set forth herein. Additionally, such apparatuses and / or methods may be implemented using other structures and / or functionality in addition to one or more of the aspects set forth herein.

[0035] It should also be noted that the figures provided in the following embodiments merely illustrate the basic concept of this application by way of illustration, and only the components related to this application are shown in the figures and are not drawn according to the number, shape, and size of the components in actual implementation, and the form, number and proportion of the components in actual implementation may be arbitrarily changed, and the layout of the components may be more complicated.

[0036] Additionally, in the following description, specific details are provided to provide a thorough understanding of the examples. However, it will be understood by a person skilled in the art that the present invention may be practiced without these specific details.

[0037] The technical solution provided by the embodiments of this application will be described with reference to the accompanying drawings.Embodiment 1:

[0038] As shown in FIG. 1 to FIG. 9, the present invention provides a gas valve with an adjustable low-flow channel. The gas valve includes a valve body 100, where a gas inlet cavity 101, a transition cavity 108, and a gas outlet cavity 102 which are sequentially connected are formed in the valve body, and the valve body 100 includes a gas inlet 103 communicated with the gas inlet cavity 101 and a gas outlet 104 communicated with the gas outlet cavity 102; a push rod 200, arranged in the gas outlet cavity 102 and capable of linearly moving along an axial direction of the gas outlet cavity 102; a solenoid valve 300, arranged at one end of the valve body 100 close to the gas inlet cavity 101. The solenoid valve 300 includes a valve core 301 capable of linearly moving along an axial direction of the gas inlet cavity 101 and a sealing block 302 connected to one end of the valve core 301 close to the gas outlet cavity 102. The sealing block 302 is configured to separate the transition cavity 108 from the gas outlet cavity 102. A first sealing ring 110 configured to hermetically engage with the push rod 200 is arranged in the valve body 100, and the first sealing ring (110) is configured to separate the transition cavity 108 from the gas outlet cavity 102. A low-flow gas channel 105 communicating the transition cavity 108 and the gas outlet 104 is formed in the valve body 100. A low-flow adjusting rod 400 is arranged in the low-flow gas channel 105, and a flow gap 500 is formed between the low-flow adjusting rod 400 and an inner wall of the low-flow gas channel 105. The low-flow adjusting rod 400 is movably arranged in the low-flow gas channel 105 to adjust a size of the flow gap 500. According to the above-mentioned technical solution of the present invention, a low-flow operating state may be achieved by arranging the low-flow gas channel 105. By arranging the low-flow adjusting rod 400 within the low-flow gas channel 105, the low-flow adjusting rod 400 may be adjusted as needed to adjust the size of the flow gap 500 between the low-flow adjusting rod 400 and the inner wall of the low-flow gas channel 105, thereby adjusting the gas flow that flows toward the gas outlet 104.

[0039] In some embodiments, the low-flow gas channel 105 includes a low-flow gas inlet channel 105a communicated with the transition cavity 108 and a low-flow gas outlet channel 105b communicated with the gas outlet 104. The low-flow gas inlet channel 105a is perpendicular to the low-flow gas outlet channel 105b. The low-flow gas outlet channel 105b extends along an axial direction to form a low-flow adjusting port 106. The low-flow adjusting rod 400 is arranged in the low-flow adjusting port 106 and is capable of linearly moving along an axial direction of the low-flow adjusting port 106. According to the above-mentioned technical solution of the present invention, as the low-flow adjusting rod 400 linearly moves along the axial direction of the low-flow adjusting port 106, the size of the flow gap 500 between the low-flow adjusting rod 400 and the inner wall of the low-flow gas channel 105 may be adjusted, thereby adjusting the gas flow that flows toward the gas outlet 104. In some embodiments, the low-flow adjusting rod 400 includes a first shaft portion 401 and a second shaft portion 402 sequentially connected along the axial direction of the low-flow adjusting port 106. A shaft diameter of the first shaft portion 401 is smaller than that of the second shaft portion 402, and a transition shaft portion 403 is formed between the first shaft portion 401 and the second shaft portion 402. The first shaft portion 401 is configured to extend into the low-flow gas outlet channel 105b, and the flow gap 500 is formed between the transition shaft portion 403 and the inner wall of the low-flow gas channel 105. Since an outer surface of the transition shaft portion 403 is a transitional curved surface connecting an outer surface of the first shaft portion 401 with an outer surface of the second shaft portion 402, when the low-flow adjusting rod 400 moves away from the low-flow gas outlet channel 105b along the axial direction of the low-flow adjusting port 106, the size of the flow gap 500 is changed from small to large; and when the low-flow adjusting rod 400 moves close to the low-flow gas outlet channel 105b along the axial direction of the low-flow adjusting port 106, the size of the flow gap 500 is changed from large to small.

[0040] In some embodiments, a second sealing ring 600 is arranged between the low-flow adjusting rod 400 and the low-flow adjusting port 106. In some embodiments, the low-flow adjusting rod 400 includes a third shaft portion 405 arranged at one end of the second shaft portion 402 away from the transition shaft portion 403. A shaft diameter of the third shaft portion 405 is larger than that of the second shaft portion 402, and an outer wall of the third shaft portion 405 abuts against an inner wall of the low-flow adjusting port 106. An annular groove 405a is formed in the third shaft portion 405, and the second sealing ring 600 is embedded in the annular groove 405a. The second sealing ring 600 is in interference fit with the low-flow adjusting port 106 to achieve a seal between the second sealing ring 600 and the low-flow adjusting port 106, and the second sealing ring 600 is in interference fit with the annular groove 405a to achieve a seal between the second sealing ring 600 and the low-flow adjusting rod 400, thereby ensuring a seal between the low-flow adjusting rod 400 and the low-flow adjusting port 106 to prevent gas leakage and ensure high safety. Moreover, since the second sealing ring 600 is embedded in the annular groove 405a, the second sealing ring 600 moves synchronously with the low-flow adjusting rod 400, thereby preventing the second sealing ring 600 from disengaging from the low-flow adjusting rod 400 and further ensuring the seal between the low-flow adjusting rod and the low-flow adjusting port 106. In some embodiments, an engagement portion 404a configured to engage with an external structure is provided at a tail end 404 of the low-flow adjusting rod 400, such that the low-flow adjusting rod 400 is capable of linearly moving along the axial direction of the low-flow adjusting port 106. In some embodiments, the low-flow adjusting rod 400 is in threaded connection with the low-flow adjusting port 106. The engagement portion 404a is a slotted groove, allowing the low-flow adjusting rod 400 to be easily screwed in or out by using a common screwdriver, thereby adjusting the size of the flow gap 500 formed between the low-flow adjusting rod 400 and the low-flow gas channel 105, which is convenient to operate.

[0041] In some embodiments, the low-flow gas outlet channel 105b extends along the axial direction to form the low-flow adjusting port 106; and the low-flow gas inlet channel 105a extends along the axial direction to form a process hole 107, and a plug 700 is fitted in the process hole 107. In some embodiments, the plug 700 is a steel ball, and the plug 700 is in interference fit with the process hole 107. Once the plug 700 is assembled into the process hole 107, the process hole 107 may be sealed, thereby ensuring good gas tightness of the low-flow gas channel 105. According to the above-mentioned technical solution of the present invention, the low-flow gas channel 105 is formed through machining, and due to a manufacturing process, the process hole 107 is typically formed. To seal the process hole 107, the plug 700 is used for blocking the process hole 107, thereby ensuring the gas tightness of the low-flow gas channel 105.

[0042] In some embodiments, the transition cavity 108 is formed between the gas inlet cavity 101 and the gas outlet cavity 102, with the gas inlet cavity 101, the transition cavity 108, and the gas outlet cavity 102 being in communication with each other. The low-flow gas channel 105 may communicate the transition cavity 108 and the gas outlet 104. The sealing block 302 is configured to separate the gas inlet cavity 101 from the transition cavity 108. In some embodiments, the valve body 100 is further provided with a pilot light gas outlet 109 communicated with the transition cavity 108. In some embodiments, the gas valve further includes an intermediate sealing member 201 and a first return spring 202, both sleeve the push rod 200. The first return spring 202 is arranged between the intermediate sealing member 201 and a tail portion 203 of the push rod 200. The tail portion 203 of the push rod 200 is provided at one end of the push rod 200 away from the gas outlet cavity 102. The first return spring 202 is configured to bias the push rod 200 continuously in a direction away from the gas outlet cavity 102. Furthermore, the valve body 100 is provided with the first sealing ring 110 between the transition cavity 108 and the gas outlet cavity 102. The push rod 200 is capable of hermetically engaging with the first sealing ring 110, thereby separating the transition cavity 108 from the gas outlet cavity 102. In some embodiments, a head portion 204 of the push rod 200 is provided with an inclined plane 205 to achieve a guidance effect, ensuring a smoother movement of the push rod 200, and especially when the push rod 200 is adapted to fit into an inner hole of the first sealing ring 110, the push rod 200 may enter the inner hole smoothly through the inclined plane 205 without scratching the inner hole of the first sealing ring 110. The tail portion 203 of the push rod 200 has a round shaft structure, and a notch 206 is formed in one end of the tail portion 203 of the push rod 200 close to the intermediate sealing member 201 to release a pneumatic pressure within a space formed between the tail portion 203 of the push rod 200 and an inner wall of the valve body 100. According to the above-mentioned technical solution of the present invention, when the push rod 200 linearly moves along the axial direction of the gas outlet cavity 102, the tail portion 203 of the push rod 200 moves in conjunction with the inner wall of the valve body 100. Since a gap between the tail portion 203 of the push rod 200 and the inner wall of the valve body 100 is relatively small, and during operation, a sealing state is formed between the tail portion 203 of the push rod 200 and the inner wall of the valve body 100 due to the action of lubricating grease, as the push rod 200 moves linearly, the pneumatic pressure within the space formed between the tail portion 203 of the push rod 200 and the inner wall of the valve body 100 also changes. Due to the formulation of the notch 206, the pneumatic pressure within the space formed between the tail portion 203 of the push rod 200 and the inner wall of the valve body 100 may be released, ensuring high safety. In some embodiments, a second return spring 303 is arranged between the valve core 301 and the sealing block 302, and the second return spring 303 is configured to bias the valve core 301 continuously in a direction close to the transition cavity 108.

[0043] The operating principles of the present invention are as follows: Closed state: When no external acting force is applied to the push rod 200, the push rod 200 is held, under the action of the first return spring 202, in a state furthest away from the gas inlet cavity 101; and the valve core 301 of the solenoid valve 300, under the action of the second return spring 303, drives the sealing block 302 to hermetically isolate the gas inlet cavity 101 from the transition cavity 108, such that the gas inlet cavity 101 becomes a sealed space, and at this time, the gas valve is at the closed state. Ignition state: The push rod 200 is actuated in an appropriate way to move close to the gas inlet cavity 101 along the axial direction of the gas outlet cavity 102, until the head portion 204 of the push rod 200 pushes against the sealing block 302 to allow the solenoid valve 300 to reach a pick-up position and compress the second return spring 303. As a result, the gas inlet cavity 101 is communicated with the transition cavity 108, and the transition cavity 108 is further communicated with the pilot light gas outlet 109, thereby achieving ignition. Low-flow state: After a flame is ignited, thermoelectric potential is generated by an external thermocouple under the action of the flame, and the generated thermoelectric potential may keep the solenoid valve 300 in a pick-up state. Once the flame is ignited, the push rod 200 is released, and the push rod 200, under the action of the first return spring 202, moves away from the gas inlet cavity 101 along the axial direction of the gas outlet cavity 102. Before the push rod 200 disengages from the first sealing ring 110, sealing between the push rod 200 and the first sealing ring 110 remains effective. Since the gas inlet cavity 101 is communicated with the transition cavity 108, and the transition cavity 108 is communicated with the low-flow gas channel 105, gas from the gas inlet cavity 101 flows into the transition cavity 108 and subsequently flows from the low-flow gas channel 105 to the gas outlet 104 for supplying fuel to a burner of a gas fireplace, which corresponds to the low-flow state. High-flow state: After the low-flow state is activated, the continued release of the push rod 200 allows the push rod 200, under the action of the first return spring 202, to keep moving away from the gas inlet cavity 101 along the axial direction of the gas outlet cavity 102 until the push rod 200 disengages from the first sealing ring 110, at this time, the transition cavity 108 is communicated with the gas outlet cavity 102. As a result, the gas from the gas inlet cavity 101 flows into the transition cavity 108 and then flows into the gas outlet 104 through the gas outlet cavity 102. Additionally, an aperture of a gas channel is far larger than that of the low-flow gas channel 105, such that a greater volume of gas is formed to flow toward the master gas outlet 104, which corresponds to the high-flow state.

[0044] A tail portion of the low-flow adjusting port 106 is communicated with an external environment, namely the tail end 404 of the low-flow adjusting rod 400 is communicated with an outside of the valve body 100. This allows for an easy adjustment of a depth at which the low-flow adjusting rod 400 is screwed into the low-flow adjusting port 106 with an appropriate tool. As a result, the size of the flow gap 500 formed between the low-flow adjusting rod 400 and the low-flow gas channel 105 may be adjusted, thereby adjusting the gas flow from the low-flow gas channel 105 to the gas outlet 104.Embodiment 2:

[0045] As shown in FIG. 10, a difference between Embodiment 2 and Embodiment 1 is as follows: In this embodiment, the low-flow gas inlet channel 105a extends along the axial direction to form the low-flow adjusting port 106; and the low-flow gas inlet channel 105b extends along the axial direction to form the process hole 107.

[0046] For the same or similar parts between the embodiments in the present specification, reference may be made to each other. Each embodiment focuses on differences from other embodiments.

[0047] The foregoing descriptions are merely a specific implementation of this application, but are not intended to limit the protection scope of this application. Any variation or replacement readily figured out by a person skilled in the art within the technical scope disclosed in this application shall fall within the protection scope of this application. Therefore, the protection scope of this application shall be subject to the protection scope of the claims.

Examples

embodiment 1

[0038]As shown in FIG. 1 to FIG. 9, the present invention provides a gas valve with an adjustable low-flow channel. The gas valve includes a valve body 100, where a gas inlet cavity 101, a transition cavity 108, and a gas outlet cavity 102 which are sequentially connected are formed in the valve body, and the valve body 100 includes a gas inlet 103 communicated with the gas inlet cavity 101 and a gas outlet 104 communicated with the gas outlet cavity 102; a push rod 200, arranged in the gas outlet cavity 102 and capable of linearly moving along an axial direction of the gas outlet cavity 102; a solenoid valve 300, arranged at one end of the valve body 100 close to the gas inlet cavity 101. The solenoid valve 300 includes a valve core 301 capable of linearly moving along an axial direction of the gas inlet cavity 101 and a sealing block 302 connected to one end of the valve core 301 close to the gas outlet cavity 102. The sealing block 302 is configured to separate the transition cav...

embodiment 2

[0045]As shown in FIG. 10, a difference between Embodiment 2 and Embodiment 1 is as follows: In this embodiment, the low-flow gas inlet channel 105a extends along the axial direction to form the low-flow adjusting port 106; and the low-flow gas inlet channel 105b extends along the axial direction to form the process hole 107.

[0046]For the same or similar parts between the embodiments in the present specification, reference may be made to each other. Each embodiment focuses on differences from other embodiments.

Technical Field

[0001] The present invention relates to the technical field of gas valves, and in particular, to a gas valve with an adjustable low-flow channel.Background

[0002] As a heating appliance that utilizes clean energy, a gas fireplace is favored by consumers not only for its ability to achieve a sufficient heating effect, but also for offering a realistic flame for visual enjoyment. As a decorative gas appliance, the gas fireplace typically requires a valve to control the supply and on-off of gas. Moreover, for mounting and layout considerations, in most cases, a direct-acting valve with axial linear movement is adopted.

[0003] However, most direct-acting valves currently available on the market do not have a flow adjustment function and operate only in two states: open and closed. Even for certain valves that offer both low-flow and high-flow operating states, such as a gas valve disclosed in Chinese Patent No. CN201520987032.5, a low-flow channel is fixed within the valve and cannot be adjusted once valve assembly is completed. However, in some cases, the required low flow varies depending on different product requirements, making the valve inconvenient to use.Summary (I) Technical problem to be solved

[0004] The technical problem to be solved by the present invention is to provide a gas valve with an adjustable low-flow channel. By providing a low-flow gas channel, the valve may operate in a low-flow state; and a low-flow adjusting rod is arranged in the low-flow gas channel to adjust a flow as needed.(II) Technical solution

[0005] To solve the above technical problem, a technical solution of the present invention provides a gas valve with an adjustable low-flow channel. The gas valve includes: a valve body, where a gas inlet cavity, a transition cavity, and a gas outlet cavity which are sequentially connected are formed in the valve body, and the valve body includes a gas inlet communicated with the gas inlet cavity and a gas outlet communicated with the gas outlet cavity; a push rod, arranged in the gas outlet cavity and capable of linearly moving along an axial direction of the gas outlet cavity; and a solenoid valve, arranged at one end of the valve body close to the gas inlet cavity, where the solenoid valve includes a valve core capable of linearly moving along an axial direction of the gas inlet cavity and a sealing block connected to one end of the valve core close to the gas outlet cavity, and the sealing block is configured to separate the gas inlet cavity from the transition cavity.

[0006] A first sealing ring configured to hermetically engage with the push rod is arranged in the valve body, and the first sealing ring is configured to separate the transition cavity from the gas outlet cavity. A low-flow gas channel communicating the transition cavity and the gas outlet is formed in the valve body. A low-flow adjusting rod is arranged in the low-flow gas channel, and a flow gap is formed between the low-flow adjusting rod and an inner wall of the low-flow gas channel. The low-flow adjusting rod is movably arranged in the low-flow gas channel to adjust a size of the flow gap.

[0007] Specifically, the first sealing ring is arranged between the transition cavity and the gas outlet cavity. The push rod hermetically engages with the first sealing ring, ensuring that a gas flow entering the gas inlet cavity may only flow through the low-flow gas channel to the gas outlet. When a seal between the push rod and the first sealing ring is released, the gas flow entering the gas inlet cavity may flow through both the low-flow gas channel to the gas outlet and through the gas outlet cavity to the gas outlet, thereby achieving a big fire state by creating two channels for leading out the gas flow.

[0008] According to the above-mentioned technical solution of the present invention, a low-flow operating state may be achieved by arranging the low-flow gas channel. By arranging the low-flow adjusting rod within the low-flow gas channel, the low-flow adjusting rod may be adjusted as needed to adjust the size of the flow gap between the low-flow adjusting rod and the inner wall of the low-flow gas channel, thereby adjusting the gas flow that flows toward the gas outlet.

[0009] In some embodiments, the low-flow gas channel includes a low-flow gas inlet channel communicated with the transition cavity and a low-flow gas outlet channel communicated with the gas outlet. The low-flow gas inlet channel intersects with the low-flow gas outlet channel. The low-flow gas inlet channel or the low-flow gas outlet channel extends along an axial direction to form a low-flow adjusting port. The low-flow adjusting rod is arranged in the low-flow adjusting port and is capable of linearly moving along an axial direction of the low-flow adjusting port.

[0010] In some embodiments, the low-flow gas inlet channel is perpendicular to the low-flow gas outlet channel.

[0011] According to the above-mentioned technical solution of the present invention, as the low-flow adjusting rod linearly moves along the axial direction of the low-flow adjusting port, the size of the flow gap between the low-flow adjusting rod and the inner wall of the low-flow gas channel may be adjusted, thereby adjusting the gas flow that flows toward the gas outlet.

[0012] In some embodiments, the low-flow adjusting rod includes a first shaft portion and a second shaft portion sequentially connected along the axial direction of the low-flow adjusting port. A shaft diameter of the first shaft portion is smaller than that of the second shaft portion, and a transition shaft portion is formed between the first shaft portion and the second shaft portion. The first shaft portion is configured to extend into the low-flow gas inlet channel or the low-flow gas outlet channel, and the flow gap is formed between the transition shaft portion and the inner wall of the low-flow gas channel. Since an outer surface of the transition shaft portion is a transitional curved surface connecting an outer surface of the first shaft portion with an outer surface of the second shaft portion, when the low-flow adjusting rod moves away from the low-flow gas inlet channel or the low-flow gas outlet channel along the axial direction of the low-flow adjusting port, the size of the flow gap is changed from small to large; and when the low-flow adjusting rod moves close to the low-flow gas inlet channel or the low-flow gas outlet channel along the axial direction of the low-flow adjusting port, the size of the flow gap is changed from large to small.

[0013] In some embodiments, a second sealing ring is arranged between the low-flow adjusting rod and the low-flow adjusting port.

[0014] In some embodiments, the low-flow adjusting rod includes a third shaft portion arranged at one end of the second shaft portion away from the transition shaft portion. A shaft diameter of the third shaft portion is larger than that of the second shaft portion, and an outer wall of the third shaft portion abuts against an inner wall of the low-flow adjusting port. An annular groove is formed in the third shaft portion, and the second sealing ring is embedded in the annular groove. The second sealing ring is in interference fit with the low-flow adjusting port to achieve a seal between the second sealing ring and the low-flow adjusting port, and the second sealing ring is in interference fit with the annular groove to achieve a seal between the second sealing ring and the low-flow adjusting rod, thereby ensuring a seal between the low-flow adjusting rod and the low-flow adjusting port to prevent gas leakage and ensure high safety. Moreover, since the second sealing ring is embedded in the annular groove of the low-flow adjusting rod, the second sealing ring moves synchronously with the low-flow adjusting rod, thereby preventing the second sealing ring from disengaging from the low-flow adjusting rod and further ensuring the seal between the low-flow adjusting rod and the low-flow adjusting port.

[0015] In some embodiments, an engagement portion configured to engage with an external structure is provided at a tail end of the low-flow adjusting rod, such that the low-flow adjusting rod is capable of linearly moving along the axial direction of the low-flow adjusting port.

[0016] In some embodiments, the low-flow adjusting rod is in threaded connection with the low-flow adjusting port. The engagement portion includes structures such as a cross recess or a slotted groove, allowing the low-flow adjusting rod to be easily screwed in or out by using a common screwdriver, thereby adjusting the size of the flow gap formed between the low-flow adjusting rod and the low-flow gas channel, which is convenient to operate.

[0017] In some embodiments, one of the low-flow gas inlet channel and the low-flow gas outlet channel extends along the axial direction to form the low-flow adjusting port; and the other one of the low-flow gas inlet channel and the low-flow gas outlet channel extends along the axial direction to form a process hole, and a plug is fitted in the process hole.

[0018] In some embodiments, the plug includes a steel ball, and the plug is in interference fit with the process hole. Once the plug is assembled into the process hole, the process hole may be sealed, thereby ensuring good gas tightness of the low-flow gas channel.

[0019] According to the above-mentioned technical solution of the present invention, the low-flow gas channel is formed through machining, and due to a manufacturing process, the process hole is typically formed. To seal the process hole, the plug is used for blocking the process hole, thereby ensuring the gas tightness of the low-flow gas channel.

[0020] In some embodiments, the transition cavity is positioned between the gas inlet cavity and the gas outlet cavity, with the gas inlet cavity, the transition cavity, and the gas outlet cavity being in communication with each other. The low-flow gas channel may communicate the transition cavity and the gas outlet. The sealing block is configured to separate the gas inlet cavity from the transition cavity.

[0021] In some embodiments, the valve body is further provided with a pilot light gas outlet communicated with the transition cavity.

[0022] In some embodiments, the gas valve further includes an intermediate sealing member and a first return spring, both sleeve the push rod. The first return spring is arranged between the intermediate sealing member and a tail portion of the push rod. The tail portion of the push rod is provided at one end of the push rod away from the gas outlet cavity. The first return spring is configured to bias the push rod continuously in a direction away from the gas outlet cavity. Furthermore, the valve body is provided with the first sealing ring between the transition cavity and the gas outlet cavity. The push rod is capable of hermetically engaging with the first sealing ring, thereby separating the transition cavity from the gas outlet cavity.

[0023] In some embodiments, a head portion of the push rod is provided with an inclined plane to achieve a guidance effect, ensuring a smoother movement of the push rod, and especially when the push rod is fitted into an inner hole of the first sealing ring, the push rod may enter the inner hole smoothly through the inclined plane without scratching the inner hole of the first sealing ring. The tail portion of the push rod has a round shaft structure, and a notch is formed in one end of the tail portion of the push rod close to the intermediate sealing member to release a pneumatic pressure within a space formed between the tail portion of the push rod and an inner wall of the valve body.

[0024] According to the above-mentioned technical solution of the present invention, when the push rod linearly moves along the axial direction of the gas outlet cavity, the tail portion of the push rod moves in conjunction with the inner wall of the valve body. Since a gap between the tail portion of the push rod and the inner wall of the valve body is relatively small, and during operation, a sealing state is formed between the tail portion of the push rod and the inner wall of the valve body due to the action of lubricating grease, as the push rod moves linearly, the pneumatic pressure within the space formed between the tail portion of the push rod and the inner wall of the valve body also changes. Due to the formulation of the notch, the pneumatic pressure within the space formed between the tail portion of the push rod and the inner wall of the valve body may be released, ensuring high safety.

[0025] In some embodiments, a second return spring is arranged between the valve core and the sealing block, and the second return spring is configured to bias the valve core continuously in a direction close to the transition cavity.

[0026] The operating principles of the present invention are as follows: Closed state: When no external acting force is applied to the push rod, the push rod is held, under the action of the first return spring, in a state furthest away from the gas inlet cavity; and the valve core of the solenoid valve, under the action of the second return spring, drives the sealing block to hermetically isolate the gas inlet cavity from the transition cavity, such that the gas inlet cavity becomes a sealed space, and at this time, the gas valve is at the closed state. Ignition state: The push rod is actuated in an appropriate way to move close to the gas inlet cavity along the axial direction of the gas outlet cavity, until the head portion of the push rod pushes against the sealing block to allow the solenoid valve to reach a pick-up position and compress the second return spring. As a result, the gas inlet cavity is communicated with the transition cavity, and the transition cavity is further communicated with the pilot light gas outlet, thereby achieving ignition. Low-flow state: After a flame is ignited, thermoelectric potential is generated by an external thermocouple under the action of the flame, and the generated thermoelectric potential may keep the solenoid valve in a pick-up state. Once the flame is ignited, the push rod is released, and the push rod, under the action of the first return spring, moves away from the gas inlet cavity along the axial direction of the gas outlet cavity. Before the push rod disengages from the first sealing ring, sealing between the push rod and the first sealing ring remains effective. Since the gas inlet cavity is communicated with the transition cavity, and the transition cavity is communicated with the low-flow gas channel, gas from the gas inlet cavity flows into the transition cavity and subsequently flows from the low-flow gas channel to the gas outlet for supplying fuel to a burner of a gas fireplace, which corresponds to the low-flow state. High-flow state: After the low-flow state is activated, the continued release of the push rod allows the push rod, under the action of the first return spring, to keep moving away from the gas inlet cavity along the axial direction of the gas outlet cavity until the push rod disengages from the first sealing ring, at this time, the transition cavity is communicated with the gas outlet cavity. As a result, the gas from the gas inlet cavity flows into the transition cavity and then flows into the gas outlet through the gas outlet cavity. Additionally, an aperture of a gas channel is far larger than that of the low-flow gas channel, such that a greater volume of gas is formed to flow toward the master gas outlet, which corresponds to the high-flow state.

[0027] A tail portion of the low-flow adjusting port is communicated with an external environment, namely the tail end of the low-flow adjusting rod is communicated with an outside of the valve body. This allows for an easy adjustment of a depth at which the low-flow adjusting rod is screwed into the low-flow adjusting port with an appropriate tool. As a result, the size of the flow gap formed between the low-flow adjusting rod and the low-flow gas channel may be adjusted, thereby adjusting the gas flow from the low-flow gas channel to the gas outlet.(III) Beneficial effects

[0028] Compared to the prior art, the present invention designs a gas valve with an adjustable low-flow channel; (1) according to the present invention, the low-flow operating state can be achieved by the low-flow gas channel. By arranging the low-flow adjusting rod within the low-flow gas channel, the low-flow adjusting rod can be adjusted as needed to adjust the size of the flow gap between the low-flow adjusting rod and the inner wall of the low-flow gas channel, thereby adjusting the gas flow that flows toward the gas outlet. The gas valve is simple in structure and convenient to adjust, and can meet varying low-flow requirements of different products, offering broader adaptability; and (2) according to the present invention, before the push rod disengages from the first sealing ring, the transition cavity is communicated with the gas outlet only through the low-flow gas channel; a low-flow position of the push rod is wider, and even if the positioning is not perfectly accurate during the release of the push rod, the stable and required low flow can still be achieved. Brief Description of Figures

[0029] To describe the technical solutions of the embodiments of this application 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 this application, and a person of ordinary skill in the art may still derive other drawings from these accompanying drawings without creative efforts. FIG. 1 is an axonometric cross-sectional view illustrating a gas valve with an adjustable low-flow channel according to Embodiment 1; FIG. 2 is an enlarged schematic diagram at Part A in FIG. 1; FIG. 3 is an exploded cross-sectional view illustrating a gas valve with an adjustable low-flow channel according to Embodiment 1; FIG. 4 is an exploded stereoscopic view illustrating a gas valve with an adjustable low-flow channel according to Embodiment 1; FIG. 5 is a cross-sectional view illustrating a gas valve with an adjustable low-flow channel in a closed state according to Embodiment 1; FIG. 6 is an enlarged schematic diagram at Part B in FIG. 5; FIG. 7 is a cross-sectional view illustrating a gas valve with an adjustable low-flow channel in an ignition state according to Embodiment 1; FIG. 8 is a cross-sectional view illustrating a gas valve with an adjustable low-flow channel in a low-flow state according to Embodiment 1; FIG. 9 is a cross-sectional view illustrating a gas valve with an adjustable low-flow channel in a high-flow state according to Embodiment 1; and FIG. 10 is a cross-sectional view illustrating a gas valve with an adjustable low-flow channel in a closed state according to Embodiment 2.

[0030] Component names corresponding to reference signs in the figures are as follows: 100. valve body, 101. gas inlet cavity; 102. gas outlet cavity; 103. gas inlet; 104. gas outlet; 105. low-flow gas channel; 105a. low-flow gas inlet channel; 105b. low-flow gas outlet channel; 106. low-flow adjusting port; 107. process hole; 108. transition cavity; 109. pilot light gas outlet; 110. first sealing ring; 200. push rod; 201. intermediate sealing member; 202. first return spring; 203. tail portion of push rod; 204. head portion of push rod; 205. inclined plane; 206. notch; 300. solenoid valve; 301. valve core; 302. sealing block; 303. second return spring; 400. low-flow adjusting rod; 401. first shaft portion; 402. second shaft portion; 403. transition shaft portion; 404. tail end of low-flow adjusting rod; 404a. engagement portion; 405. third shaft portion; 405a. annular groove; 500. flow gap; 600. second sealing ring; and 700. plug.Detailed Description

[0031] The specific implementations of the present invention will be described in further detail below with reference to the accompanying drawings and embodiments. The following embodiments are intended to illustrate the present invention, but are not intended to limit the scope of the present invention.

[0032] In the description of the present invention, it should be noted that unless otherwise explicitly specified or defined, the terms such as "mount", "connect", and "connection" should be understood in a broad sense. For example, the connection may be a fixed connection, a detachable connection, or an integral connection; or the connection may be a mechanical connection or an electrical connection; or the connection may be a direct connection, an indirect connection through an intermediary, or internal communication between two elements. For those of ordinary skill in the art, the specific meanings of the aforementioned terms in the present invention can be understood according to specific conditions.

[0033] 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 apparent that the described embodiments are only some, but not all, embodiments of this application. This application may also be implemented or applied through other different specific implementations. Various modifications or changes may also be made on the details in the present specification without departing from the spirit of this application 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. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of this application without making any inventive labor still fall within the scope of protection of this application.

[0034] It should be noted that various aspects of the embodiments within the scope of the following claims are described below. It should be apparent that the aspects described herein may be embodied in a wide variety of forms and that any specific structure and / or function described herein is merely illustrative. Based on this application, a person skilled in the art should appreciate that one aspect described herein may be implemented independently of any other aspect, and that two or more of these aspects may be combined in various ways. For example, apparatuses and / or methods may be implemented using any number and aspects set forth herein. Additionally, such apparatuses and / or methods may be implemented using other structures and / or functionality in addition to one or more of the aspects set forth herein.

[0035] It should also be noted that the figures provided in the following embodiments merely illustrate the basic concept of this application by way of illustration, and only the components related to this application are shown in the figures and are not drawn according to the number, shape, and size of the components in actual implementation, and the form, number and proportion of the components in actual implementation may be arbitrarily changed, and the layout of the components may be more complicated.

[0036] Additionally, in the following description, specific details are provided to provide a thorough understanding of the examples. However, it will be understood by a person skilled in the art that the present invention may be practiced without these specific details.

[0037] The technical solution provided by the embodiments of this application will be described with reference to the accompanying drawings.Embodiment 1:

[0038] As shown in FIG. 1 to FIG. 9, the present invention provides a gas valve with an adjustable low-flow channel. The gas valve includes a valve body 100, where a gas inlet cavity 101, a transition cavity 108, and a gas outlet cavity 102 which are sequentially connected are formed in the valve body, and the valve body 100 includes a gas inlet 103 communicated with the gas inlet cavity 101 and a gas outlet 104 communicated with the gas outlet cavity 102; a push rod 200, arranged in the gas outlet cavity 102 and capable of linearly moving along an axial direction of the gas outlet cavity 102; a solenoid valve 300, arranged at one end of the valve body 100 close to the gas inlet cavity 101. The solenoid valve 300 includes a valve core 301 capable of linearly moving along an axial direction of the gas inlet cavity 101 and a sealing block 302 connected to one end of the valve core 301 close to the gas outlet cavity 102. The sealing block 302 is configured to separate the transition cavity 108 from the gas outlet cavity 102. A first sealing ring 110 configured to hermetically engage with the push rod 200 is arranged in the valve body 100, and the first sealing ring (110) is configured to separate the transition cavity 108 from the gas outlet cavity 102. A low-flow gas channel 105 communicating the transition cavity 108 and the gas outlet 104 is formed in the valve body 100. A low-flow adjusting rod 400 is arranged in the low-flow gas channel 105, and a flow gap 500 is formed between the low-flow adjusting rod 400 and an inner wall of the low-flow gas channel 105. The low-flow adjusting rod 400 is movably arranged in the low-flow gas channel 105 to adjust a size of the flow gap 500. According to the above-mentioned technical solution of the present invention, a low-flow operating state may be achieved by arranging the low-flow gas channel 105. By arranging the low-flow adjusting rod 400 within the low-flow gas channel 105, the low-flow adjusting rod 400 may be adjusted as needed to adjust the size of the flow gap 500 between the low-flow adjusting rod 400 and the inner wall of the low-flow gas channel 105, thereby adjusting the gas flow that flows toward the gas outlet 104.

[0039] In some embodiments, the low-flow gas channel 105 includes a low-flow gas inlet channel 105a communicated with the transition cavity 108 and a low-flow gas outlet channel 105b communicated with the gas outlet 104. The low-flow gas inlet channel 105a is perpendicular to the low-flow gas outlet channel 105b. The low-flow gas outlet channel 105b extends along an axial direction to form a low-flow adjusting port 106. The low-flow adjusting rod 400 is arranged in the low-flow adjusting port 106 and is capable of linearly moving along an axial direction of the low-flow adjusting port 106. According to the above-mentioned technical solution of the present invention, as the low-flow adjusting rod 400 linearly moves along the axial direction of the low-flow adjusting port 106, the size of the flow gap 500 between the low-flow adjusting rod 400 and the inner wall of the low-flow gas channel 105 may be adjusted, thereby adjusting the gas flow that flows toward the gas outlet 104. In some embodiments, the low-flow adjusting rod 400 includes a first shaft portion 401 and a second shaft portion 402 sequentially connected along the axial direction of the low-flow adjusting port 106. A shaft diameter of the first shaft portion 401 is smaller than that of the second shaft portion 402, and a transition shaft portion 403 is formed between the first shaft portion 401 and the second shaft portion 402. The first shaft portion 401 is configured to extend into the low-flow gas outlet channel 105b, and the flow gap 500 is formed between the transition shaft portion 403 and the inner wall of the low-flow gas channel 105. Since an outer surface of the transition shaft portion 403 is a transitional curved surface connecting an outer surface of the first shaft portion 401 with an outer surface of the second shaft portion 402, when the low-flow adjusting rod 400 moves away from the low-flow gas outlet channel 105b along the axial direction of the low-flow adjusting port 106, the size of the flow gap 500 is changed from small to large; and when the low-flow adjusting rod 400 moves close to the low-flow gas outlet channel 105b along the axial direction of the low-flow adjusting port 106, the size of the flow gap 500 is changed from large to small.

[0040] In some embodiments, a second sealing ring 600 is arranged between the low-flow adjusting rod 400 and the low-flow adjusting port 106. In some embodiments, the low-flow adjusting rod 400 includes a third shaft portion 405 arranged at one end of the second shaft portion 402 away from the transition shaft portion 403. A shaft diameter of the third shaft portion 405 is larger than that of the second shaft portion 402, and an outer wall of the third shaft portion 405 abuts against an inner wall of the low-flow adjusting port 106. An annular groove 405a is formed in the third shaft portion 405, and the second sealing ring 600 is embedded in the annular groove 405a. The second sealing ring 600 is in interference fit with the low-flow adjusting port 106 to achieve a seal between the second sealing ring 600 and the low-flow adjusting port 106, and the second sealing ring 600 is in interference fit with the annular groove 405a to achieve a seal between the second sealing ring 600 and the low-flow adjusting rod 400, thereby ensuring a seal between the low-flow adjusting rod 400 and the low-flow adjusting port 106 to prevent gas leakage and ensure high safety. Moreover, since the second sealing ring 600 is embedded in the annular groove 405a, the second sealing ring 600 moves synchronously with the low-flow adjusting rod 400, thereby preventing the second sealing ring 600 from disengaging from the low-flow adjusting rod 400 and further ensuring the seal between the low-flow adjusting rod and the low-flow adjusting port 106. In some embodiments, an engagement portion 404a configured to engage with an external structure is provided at a tail end 404 of the low-flow adjusting rod 400, such that the low-flow adjusting rod 400 is capable of linearly moving along the axial direction of the low-flow adjusting port 106. In some embodiments, the low-flow adjusting rod 400 is in threaded connection with the low-flow adjusting port 106. The engagement portion 404a is a slotted groove, allowing the low-flow adjusting rod 400 to be easily screwed in or out by using a common screwdriver, thereby adjusting the size of the flow gap 500 formed between the low-flow adjusting rod 400 and the low-flow gas channel 105, which is convenient to operate.

[0041] In some embodiments, the low-flow gas outlet channel 105b extends along the axial direction to form the low-flow adjusting port 106; and the low-flow gas inlet channel 105a extends along the axial direction to form a process hole 107, and a plug 700 is fitted in the process hole 107. In some embodiments, the plug 700 is a steel ball, and the plug 700 is in interference fit with the process hole 107. Once the plug 700 is assembled into the process hole 107, the process hole 107 may be sealed, thereby ensuring good gas tightness of the low-flow gas channel 105. According to the above-mentioned technical solution of the present invention, the low-flow gas channel 105 is formed through machining, and due to a manufacturing process, the process hole 107 is typically formed. To seal the process hole 107, the plug 700 is used for blocking the process hole 107, thereby ensuring the gas tightness of the low-flow gas channel 105.

[0042] In some embodiments, the transition cavity 108 is formed between the gas inlet cavity 101 and the gas outlet cavity 102, with the gas inlet cavity 101, the transition cavity 108, and the gas outlet cavity 102 being in communication with each other. The low-flow gas channel 105 may communicate the transition cavity 108 and the gas outlet 104. The sealing block 302 is configured to separate the gas inlet cavity 101 from the transition cavity 108. In some embodiments, the valve body 100 is further provided with a pilot light gas outlet 109 communicated with the transition cavity 108. In some embodiments, the gas valve further includes an intermediate sealing member 201 and a first return spring 202, both sleeve the push rod 200. The first return spring 202 is arranged between the intermediate sealing member 201 and a tail portion 203 of the push rod 200. The tail portion 203 of the push rod 200 is provided at one end of the push rod 200 away from the gas outlet cavity 102. The first return spring 202 is configured to bias the push rod 200 continuously in a direction away from the gas outlet cavity 102. Furthermore, the valve body 100 is provided with the first sealing ring 110 between the transition cavity 108 and the gas outlet cavity 102. The push rod 200 is capable of hermetically engaging with the first sealing ring 110, thereby separating the transition cavity 108 from the gas outlet cavity 102. In some embodiments, a head portion 204 of the push rod 200 is provided with an inclined plane 205 to achieve a guidance effect, ensuring a smoother movement of the push rod 200, and especially when the push rod 200 is adapted to fit into an inner hole of the first sealing ring 110, the push rod 200 may enter the inner hole smoothly through the inclined plane 205 without scratching the inner hole of the first sealing ring 110. The tail portion 203 of the push rod 200 has a round shaft structure, and a notch 206 is formed in one end of the tail portion 203 of the push rod 200 close to the intermediate sealing member 201 to release a pneumatic pressure within a space formed between the tail portion 203 of the push rod 200 and an inner wall of the valve body 100. According to the above-mentioned technical solution of the present invention, when the push rod 200 linearly moves along the axial direction of the gas outlet cavity 102, the tail portion 203 of the push rod 200 moves in conjunction with the inner wall of the valve body 100. Since a gap between the tail portion 203 of the push rod 200 and the inner wall of the valve body 100 is relatively small, and during operation, a sealing state is formed between the tail portion 203 of the push rod 200 and the inner wall of the valve body 100 due to the action of lubricating grease, as the push rod 200 moves linearly, the pneumatic pressure within the space formed between the tail portion 203 of the push rod 200 and the inner wall of the valve body 100 also changes. Due to the formulation of the notch 206, the pneumatic pressure within the space formed between the tail portion 203 of the push rod 200 and the inner wall of the valve body 100 may be released, ensuring high safety. In some embodiments, a second return spring 303 is arranged between the valve core 301 and the sealing block 302, and the second return spring 303 is configured to bias the valve core 301 continuously in a direction close to the transition cavity 108.

[0043] The operating principles of the present invention are as follows: Closed state: When no external acting force is applied to the push rod 200, the push rod 200 is held, under the action of the first return spring 202, in a state furthest away from the gas inlet cavity 101; and the valve core 301 of the solenoid valve 300, under the action of the second return spring 303, drives the sealing block 302 to hermetically isolate the gas inlet cavity 101 from the transition cavity 108, such that the gas inlet cavity 101 becomes a sealed space, and at this time, the gas valve is at the closed state. Ignition state: The push rod 200 is actuated in an appropriate way to move close to the gas inlet cavity 101 along the axial direction of the gas outlet cavity 102, until the head portion 204 of the push rod 200 pushes against the sealing block 302 to allow the solenoid valve 300 to reach a pick-up position and compress the second return spring 303. As a result, the gas inlet cavity 101 is communicated with the transition cavity 108, and the transition cavity 108 is further communicated with the pilot light gas outlet 109, thereby achieving ignition. Low-flow state: After a flame is ignited, thermoelectric potential is generated by an external thermocouple under the action of the flame, and the generated thermoelectric potential may keep the solenoid valve 300 in a pick-up state. Once the flame is ignited, the push rod 200 is released, and the push rod 200, under the action of the first return spring 202, moves away from the gas inlet cavity 101 along the axial direction of the gas outlet cavity 102. Before the push rod 200 disengages from the first sealing ring 110, sealing between the push rod 200 and the first sealing ring 110 remains effective. Since the gas inlet cavity 101 is communicated with the transition cavity 108, and the transition cavity 108 is communicated with the low-flow gas channel 105, gas from the gas inlet cavity 101 flows into the transition cavity 108 and subsequently flows from the low-flow gas channel 105 to the gas outlet 104 for supplying fuel to a burner of a gas fireplace, which corresponds to the low-flow state. High-flow state: After the low-flow state is activated, the continued release of the push rod 200 allows the push rod 200, under the action of the first return spring 202, to keep moving away from the gas inlet cavity 101 along the axial direction of the gas outlet cavity 102 until the push rod 200 disengages from the first sealing ring 110, at this time, the transition cavity 108 is communicated with the gas outlet cavity 102. As a result, the gas from the gas inlet cavity 101 flows into the transition cavity 108 and then flows into the gas outlet 104 through the gas outlet cavity 102. Additionally, an aperture of a gas channel is far larger than that of the low-flow gas channel 105, such that a greater volume of gas is formed to flow toward the master gas outlet 104, which corresponds to the high-flow state.

[0044] A tail portion of the low-flow adjusting port 106 is communicated with an external environment, namely the tail end 404 of the low-flow adjusting rod 400 is communicated with an outside of the valve body 100. This allows for an easy adjustment of a depth at which the low-flow adjusting rod 400 is screwed into the low-flow adjusting port 106 with an appropriate tool. As a result, the size of the flow gap 500 formed between the low-flow adjusting rod 400 and the low-flow gas channel 105 may be adjusted, thereby adjusting the gas flow from the low-flow gas channel 105 to the gas outlet 104.Embodiment 2:

[0045] As shown in FIG. 10, a difference between Embodiment 2 and Embodiment 1 is as follows: In this embodiment, the low-flow gas inlet channel 105a extends along the axial direction to form the low-flow adjusting port 106; and the low-flow gas inlet channel 105b extends along the axial direction to form the process hole 107.

[0046] For the same or similar parts between the embodiments in the present specification, reference may be made to each other. Each embodiment focuses on differences from other embodiments.

[0047] The foregoing descriptions are merely a specific implementation of this application, but are not intended to limit the protection scope of this application. Any variation or replacement readily figured out by a person skilled in the art within the technical scope disclosed in this application shall fall within the protection scope of this application. Therefore, the protection scope of this application shall be subject to the protection scope of the claims.

Examples

embodiment 1

[0038]As shown in FIG. 1 to FIG. 9, the present invention provides a gas valve with an adjustable low-flow channel. The gas valve includes a valve body 100, where a gas inlet cavity 101, a transition cavity 108, and a gas outlet cavity 102 which are sequentially connected are formed in the valve body, and the valve body 100 includes a gas inlet 103 communicated with the gas inlet cavity 101 and a gas outlet 104 communicated with the gas outlet cavity 102; a push rod 200, arranged in the gas outlet cavity 102 and capable of linearly moving along an axial direction of the gas outlet cavity 102; a solenoid valve 300, arranged at one end of the valve body 100 close to the gas inlet cavity 101. The solenoid valve 300 includes a valve core 301 capable of linearly moving along an axial direction of the gas inlet cavity 101 and a sealing block 302 connected to one end of the valve core 301 close to the gas outlet cavity 102. The sealing block 302 is configured to separate the transition cav...

embodiment 2

[0045]As shown in FIG. 10, a difference between Embodiment 2 and Embodiment 1 is as follows: In this embodiment, the low-flow gas inlet channel 105a extends along the axial direction to form the low-flow adjusting port 106; and the low-flow gas inlet channel 105b extends along the axial direction to form the process hole 107.

[0046]For the same or similar parts between the embodiments in the present specification, reference may be made to each other. Each embodiment focuses on differences from other embodiments.

Claims

1. A gas valve with an adjustable low-flow channel, comprising: a valve body (100), wherein a gas inlet cavity (101), a transition cavity (108), and a gas outlet cavity (102) which are sequentially connected are formed in the valve body; and the valve body (100) comprises a gas inlet (103) communicated with the gas inlet cavity (101) and a gas outlet(104) communicated with the gas outlet cavity (102); a push rod (200), arranged in the gas outlet cavity (102) and capable of linearly moving along an axial direction of the gas outlet cavity (102); a solenoid valve (300), arranged at one end of the valve body (100) close to the gas inlet cavity (101), wherein the solenoid valve (300) comprises a valve core (301) capable of linearly moving along an axial direction of the gas inlet cavity (101) and a sealing block (302) connected to one end of the valve core (301) close to the gas outlet cavity (102), and the sealing block (302) is configured to separate the gas inlet cavity (101) from the transition cavity (108); wherein a first sealing ring (110) configured to hermetically engage with the push rod (200) is arranged in the valve body (100), and the first sealing ring (110) is configured to separate the transition cavity (108) from the gas outlet cavity (102); a low-flow gas channel (105) communicating the transition cavity (108) and the gas outlet (104) is formed in the valve body (100), a low-flow adjusting rod (400) is arranged in the low-flow gas channel (105), and a flow gap (500) is formed between the low-flow adjusting rod (400) and an inner wall of the low-flow gas channel (105); and the low-flow adjusting rod (400) is movably arranged in the low-flow gas channel (105) to adjust a size of the flow gap (500).

2. The gas valve with the adjustable low-flow channel according to claim 1, characterized in that the low-flow gas channel (105) comprises a low-flow gas inlet channel (105a) communicated with the transition cavity (108) and a low-flow gas outlet channel (105b) communicated with the gas outlet (104), and the low-flow gas inlet channel (105a) intersects with the low-flow gas outlet channel (105b); the low-flow gas inlet channel (105a) or the low-flow gas outlet channel (105b) extends along an axial direction to form a low-flow adjusting port (106), and the low-flow adjusting rod (400) is arranged in the low-flow adjusting port (106) and is capable of linearly moving along an axial direction of the low-flow adjusting port (106).

3. The gas valve with the adjustable low-flow channel according to claim 2, characterized in that the low-flow adjusting rod (400) comprises a first shaft portion (401) and a second shaft portion (402) sequentially connected along the axial direction of the low-flow adjusting port (106), a shaft diameter of the first shaft portion (401) is smaller than that of the second shaft portion (402), a transition shaft portion (403) is formed between the first shaft portion (401) and the second shaft portion (402), the first shaft portion (401) is configured to extend into the low-flow gas inlet channel (105a) or the low-flow gas outlet channel (105b), and the flow gap (500) is formed between the transition shaft portion (403) and the inner wall of the low-flow gas channel (105); when the low-flow adjusting rod (400) moves away from the low-flow gas inlet channel (105a) or the low-flow gas outlet channel (105b) along the axial direction of the low-flow adjusting port (106), the size of the flow gap (500) is changed from small to large; and when the low-flow adjusting rod (400) moves close to the low-flow gas inlet channel (105a) or the low-flow gas outlet channel (105b) along the axial direction of the low-flow adjusting port (106), the size of the flow gap (500) is changed from large to small.

4. The gas valve with the adjustable low-flow channel according to claim 2, characterized in that a second sealing ring (600) is arranged between the low-flow adjusting rod (400) and the low-flow adjusting port (106).

5. The gas valve with the adjustable low-flow channel according to claim 2, characterized in that the low-flow adjusting rod (400) is in threaded connection with the low-flow adjusting port (106).

6. The gas valve with the adjustable low-flow channel according to claim 2, characterized in that an engagement portion (404a) configured to engage with an external structure is provided at a tail end (404) of the low-flow adjusting rod (400), such that the low-flow adjusting rod (400) is capable of linearly moving along the axial direction of the low-flow adjusting port (106).

7. The gas valve with the adjustable low-flow channel according to claim 2, characterized in that one of the low-flow gas inlet channel (105a) and the low-flow gas outlet channel (105b) extends along an axial direction to form the low-flow adjusting port (106); and the other one of the low-flow gas inlet channel (105a) and the low-flow gas outlet channel (105b) extends along an axial direction to form a process hole (107), and a plug (700) is fitted in the process hole (107).

8. The gas valve with the adjustable low-flow channel according to claim 1, characterized in that the gas valve further comprises an intermediate sealing member (201) and a first return spring (202), both sleeve the push rod (200), the first return spring (202) is arranged between the intermediate sealing member (201) and a tail portion (203) of the push rod (200), the tail portion (203) of the push rod (200) is provided at one end of the push rod (200) away from the gas outlet cavity (102), and the first return spring (202) is configured to bias the push rod (200) continuously in a direction away from the gas outlet cavity (102).

9. The gas valve with the adjustable low-flow channel according to claim 1, characterized in that an inclined plane (205) is arranged at a head portion (204) of the push rod (200).

10. The gas valve with the adjustable low-flow channel according to claim 1, characterized in that a notch (206) is formed in the tail portion (203) of the push rod (200).

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