An overpressure cut-off device and its valve device

Abstract

The present invention discloses an overpressure cutoff device and a valve device thereof, comprising a push rod structure and a driving handle movably arranged in a first valve body, and a cutoff diaphragm and a cutoff connecting rod linked to the second valve body, a reset spring is provided between the driving handle and the first valve body, the push rod structure is extended to connect the diaphragm pressure regulator, and the push rod structure and the cutoff connecting rod form a limit fit. When the downstream pressure of the valve continues to rise, the gas is transmitted to the lower side of the cutoff diaphragm through the first conduit, and the cutoff connecting rod is driven to move upward by the cutoff diaphragm and separate from the push rod structure to release the limit fit. At this time, the push rod structure moves to the side away from the diaphragm pressure regulator under the drive of the reset spring, and the valve is quickly cut off and closed under an overpressure state through the overpressure cutoff device, which significantly reduces safety accidents such as leakage and explosion caused by overpressure and ensures the safety of personnel and equipment. This valve device is equipped with an overpressure cutoff device to achieve the dual functions of overpressure cutoff and conventional pressure regulation.

Description

Technical Field

[0001] The present invention relates to the technical field of valve control, and particularly relates to an overpressure cut-off device and its valve device. Background Art

[0002] A valve is a device used to control the direction, pressure, and flow rate of a fluid in a fluid system. Most valves on the market only contain core components such as a valve body, a valve core, and a closing spring. Without an electromagnetic mechanism, they do not have an automatic opening function. For some gas valves with a large starting pressure, the electromagnetic mechanism needs to be very large, resulting in huge production costs and being inapplicable. In order to meet the requirements of automatic control for valves in gas pipeline projects, the current practice is to apply a pressure regulating actuator to the automatic control of valves. A pressure regulating actuator is a device that keeps the outlet gas at a specified pressure by automatically changing the gas flow rate through the valve. The basic structure of this pressure regulating actuator includes a housing, an elastic diaphragm, and a pressure regulating rod. The elastic diaphragm is installed in the housing to form a pressure regulating structure that divides the inner cavity into upper and lower diaphragm cavities. The pressure regulating actuator is installed on the valve, and the elastic diaphragm is connected to the valve core through the pressure regulating rod. The elastic diaphragm will move up or down under the action of a pressure signal and drive the valve core to move up and down through the pressure regulating rod. Since the up and down movement of the valve core can increase or decrease the outlet opening of the valve, the "peak shaving and valley filling" type of pressure regulating operation can be performed on the fluctuating pressure. However, existing pressure regulating actuators generally only operate under a set pressure environment, with low pressure regulating sensitivity, poor pressure regulating accuracy and pressure stabilizing performance. Especially when the downstream pressure of the valve exceeds the set pressure, overpressure phenomena are likely to occur, which will cause the elastic diaphragm to be quickly damaged. In severe cases, the entire pressure regulator will lose its pressure regulating function, and there is a safety hazard if the valve is not quickly cut off in a timely manner. Summary of the Invention

[0003] Therefore, the technical problem to be solved by the present invention is to overcome the problems in the prior art that the pressure regulating actuator of the valve generally only operates under a set pressure environment, and when the downstream pressure of the valve exceeds the pressure, the entire pressure regulator will lose its pressure regulating function, and there is a safety hazard if the valve is not quickly cut off in a timely manner.

[0004] To solve the above technical problems, the present invention provides an overpressure cut-off device for use in conjunction with a valve device. The valve device includes a bypass valve connected between an upper oil chamber and a lower oil chamber, and a diaphragm pressure regulator for closing or opening the bypass valve. The overpressure cut-off device includes:

[0005] A cut-off driving mechanism, including a first valve body connected to the valve device, a push rod structure movably disposed in the first valve body along a first direction, and a driving handle disposed in the first valve body and linked with the push rod structure. A return spring is disposed between the driving handle and the first valve body, and the push rod structure extends to connect the diaphragm pressure regulator;

[0006] The overpressure trigger mechanism includes a second valve body connected to the first valve body and a cut-off diaphragm and a cut-off connecting rod linkedly arranged in the inner cavity of the second valve body, and the cut-off diaphragm divides the inner cavity of the second valve body into an upper pressure chamber and a lower pressure chamber, and a cut-off spring arranged in the upper pressure chamber and pressing against the cut-off diaphragm, a first conduit is connected between the valve pipe of the valve device and the lower pressure chamber, and the cut-off connecting rod moves in a perpendicular direction to the first direction under the drive of the cut-off diaphragm and cooperates with the push rod structure, and the push rod structure has a locking state connected to the cut-off connecting rod to form a limit cooperation, and an unlocking state separated from the cut-off connecting rod; the push rod structure applies pressure to the diaphragm pressure regulator to close the bypass valve in the locked state, and in the unlocked state, it is driven by the return spring to move to the side away from the diaphragm pressure regulator to loosen the diaphragm pressure regulator, so that the diaphragm pressure regulator opens the bypass valve under the action of oil pressure.

[0007] In the above-mentioned overpressure cutoff device, a limiting structure for forming a limiting fit is provided between the push rod structure and the cut-off connecting rod. The limiting structure includes a limiting groove provided on the push rod structure and a limiting end provided at one end of the cut-off connecting rod. The limiting end penetrates into the first valve body and cooperates with the limiting groove to abut against it.

[0008] In the above-mentioned overpressure cutoff device, a mounting recessed hole extending perpendicular to the first direction is provided on the side wall of the first valve body, the push rod structure moves through the mounting recessed hole, the second valve body is fixed in the mounting recessed hole by a locking member and is vertically connected to the first valve body, and the cut-off connecting rod drives the limiting end to penetrate into the mounting recessed hole and cooperate with the limiting groove on the push rod structure.

[0009] In the above-mentioned overpressure cutoff device, the first valve body is connected to the valve device to form an installation cavity for accommodating the diaphragm pressure regulator. The diaphragm pressure regulator divides the installation cavity into a left diaphragm cavity and a right diaphragm cavity. A second conduit is provided between the right diaphragm cavity and the valve pipeline. The push rod structure includes a push rod body that forms a limiting fit with the cut-off link, and a pressure regulating assembly elastically connected between the push rod body and the diaphragm pressure regulator.

[0010] In the above-mentioned overpressure cut-off device, the pressure-regulating assembly includes a pressure-regulating rod, a pressure-regulating screw, a pressure-regulating spring and a push rod arranged in the regulating channel of the first valve body, the pressure-regulating screw being threadedly connected to the regulating channel, the pressure-regulating rod moves along the first direction through the pressure-regulating screw and is movably connected to the push rod, the push rod extends out of the regulating channel and contacts the diaphragm pressure regulator, and is slidable within a set distance along the first direction relative to the pressure-regulating rod, the pressure-regulating spring is arranged between the push rod and the pressure-regulating screw, the push rod body is fixedly connected to the end of the pressure-regulating rod away from the push rod, and a transmission fit for transmitting torque is formed between the pressure-regulating rod and the pressure-regulating screw, so that the pressure-regulating rod drives the pressure-regulating screw to move along the regulating channel when the push rod body rotates.

[0011] In the above overpressure cut-off device, the pressure-regulating screw is provided with an internal hexagonal hole, the pressure-regulating rod includes a guide rod portion that fits through the internal hexagonal hole, a fixing hole is provided on the guide rod portion, and one end of the push rod body is fixed to the fixing hole.

[0012] In the above overpressure cut-off device, the driving handle and the push rod structure are rotatably arranged in the first valve body, a spring cavity suitable for accommodating a return spring is formed between the driving handle and the first valve body, a movement guide hole extending in the first direction and connecting the regulating channel is arranged in the first valve body, the push rod body is movably arranged in the movement guide hole, and the diameter of the end portion of the guide rod portion is larger than the aperture of the push rod through hole.

[0013] In the above overpressure cut-off device, the ejector rod includes a connecting sleeve formed at one end thereof and a plugging groove arranged in the connecting sleeve, the pressure-regulating rod includes a plugging rod portion plugged in the plugging groove, the plugging rod portion can move in the plugging groove along the first direction, and the cross-sectional shapes of the plugging groove and the plugging rod portion are respectively T-shaped structures that are adapted to each other.

[0014] In the above overpressure cut-off device, the second valve body includes an upper cylindrical portion connected to the upper side of the upper pressure chamber and a lower cylindrical portion connected to the lower side of the lower pressure chamber, an internal thread is provided in the upper cylindrical portion for connecting a cut-off adjusting screw, one end of the cut-off spring abuts against the cut-off adjusting screw, and the other end abuts against the cut-off diaphragm.

[0015] In the above overpressure cut-off device, both ends of the locking member are provided with threaded joints threadedly connected to the lower cylindrical portion and the installation concave hole, the locking member has a guiding hole through which the cut-off connecting rod can pass, and sealing rings or sealants are respectively arranged between the locking member and the first valve body and the second valve body.

[0016] In the above overpressure cut-off device, the diaphragm pressure regulator includes a pressure-regulating diaphragm arranged in the pressure-regulating chamber and connected to the ejector rod, a lever structure swingably arranged between the pressure-regulating diaphragm and the bypass valve, and a round needle pressed by the lever structure against the central through hole of the bypass valve.

[0017] The present invention also provides a valve device, including a valve body and the overpressure cut-off device according to any one of the above, the valve body includes an upper oil chamber and a lower oil chamber that are sealed and separated, a piston pump assembly and a valve rod assembly movably arranged between the upper oil chamber and the lower oil chamber, the valve rod assembly is provided with a valve disk opposite to the valve orifice, and a closing spring is arranged between the valve disk and the valve body, the bypass valve is arranged on the side wall of the upper oil chamber, and an oil return port communicating with the bypass valve is arranged on the side wall of the lower oil chamber.

[0018] The technical solution of the present invention has the following advantages compared with the prior art:

[0019] 1. In the overpressure cutoff device provided by the present invention, the push rod structure forms a limit cooperation with the cut-off connecting rod in the locked state, and cuts off the diaphragm pressure regulator to seal the bypass valve. At this time, the valve device is opened normally. When the downstream pressure of the valve pipeline increases and overpressure occurs, the gas is transmitted to the lower pressure chamber through the first conduit to push the cut-off diaphragm upward, and at the same time drives the cut-off connecting rod to move upward and separate from the push rod structure to release the limit cooperation. At this time, the push rod structure moves to the side away from the diaphragm pressure regulator under the drive of the return spring and switches to the unlocked state, while releasing the diaphragm pressure regulator, so that the diaphragm pressure regulator opens the bypass valve under the action of oil pressure, thereby returning the oil in the upper oil chamber to the lower oil chamber through the bypass valve. In the cavity, the valve device closes the valve mouth under the action of its own closing spring as the oil chamber loses pressure. The advantage of adopting this technical solution is that the overpressure cut-off device can realize rapid cutting and closing of the valve under overpressure state, and the cutting response is fully automated, avoiding dependence on manual monitoring and operation, and reducing the risk of human misjudgment or delay; this overpressure cut-off device is an independent component, which is easy to repair or replace, reducing maintenance costs, and is suitable for valves with large flow fluctuations or sudden pressure changes. It can quickly stabilize the system and avoid pressure accumulation caused by insufficient adjustment speed of the diaphragm pressure regulator, thereby significantly reducing safety accidents such as leakage and explosion caused by overpressure, and ensuring the safety of personnel and equipment.

[0020] When the diaphragm is in the closed position, the diaphragm is in the closed position and the diaphragm is in the closed position, so that the diaphragm is in the closed position and the diaphragm is in the closed position.

[0021] 3. In the overpressure cut-off device provided by the present invention, in the pressure regulating system of the valve device, the right membrane cavity and the medium passage are connected through the second conduit. The ejector rod in the pressure regulating assembly extends into the left membrane cavity and abuts against the pressure regulating diaphragm. The advantage of this design is that the left side of the pressure regulating diaphragm is subjected to the pressure of the ejector rod, and the right side is subjected to the pressure of the right membrane cavity. Under the action of the pressure difference between the two, the pressure regulating diaphragm makes a reciprocating motion in the pressure regulating cavity. When the ejector rod is pushed by the pressure regulating diaphragm, it will displace and adjust within a set distance relative to the push rod structure. Thus, the diaphragm pressure regulator moderately opens the bypass valve according to the change of the pressure in the right membrane cavity, and finally controls the gas pressure to be maintained within the specified pressure range by adjusting the opening of the valve, realizing the voltage stabilizing function. In summary, through the cooperation of the diaphragm pressure regulator and the pressure regulating assembly, the automatic pressure regulating function of the valve device within the specified pressure range is realized.

[0022] 4. In the overpressure cut-off device provided by the present invention, the pressure regulating spring is arranged between the adjusting screw and the ejector rod. The pressure regulating rod is matched to pass through the inner hexagonal hole of the adjusting screw. With this structural arrangement, when the push rod drives the pressure regulating rod and the ejector rod to move linearly, the pressure regulating rod slides along the axis of the inner hexagonal hole (the inner wall of the hole is not engaged with the push rod), and only transmits motion and force between the push rod and the ejector rod, ensuring that the push rod structure drives the ejector rod to act quickly in the unlocked state to achieve overpressure cut-off of the valve; in addition, when the push rod drives the adjusting rod to rotate, it will drive the adjusting screw to rotate synchronously, making the adjusting screw move and change its axial position by using the mechanical characteristics of the thread pair, and precisely adjusting the spring pre-tightening force by compressing or releasing the adjusting spring, so as to achieve the purpose of accurately adjusting the trigger pressure threshold of the ejector rod acting on the pressure regulating diaphragm and adapting to different working conditions.

[0023] 5. In the overpressure cut-off device provided by the present invention, the diaphragm pressure regulator and the pressure regulating assembly are used to regulate the pressure of the valve within the set pressure range. When the downstream pressure of the medium passage increases, the pressure is conducted to the right membrane cavity through the second conduit, thereby driving the pressure regulating diaphragm to move to the left and push open the ejector rod. The ejector rod can move a certain distance relative to the adjusting rod by compressing the pressure regulating spring, so as to adjust and close the valve opening to reduce the pressure. This diaphragm pressure regulator timely controls the opening of the valve according to the air pressure to realize the pressure regulating and voltage stabilizing function and keep the outlet pressure stable; once the flow pressure is too large, resulting in the failure of the diaphragm pressure regulator or inability to close the valve, at this time, the overpressure cut-off device intervenes. The push rod structure in the unlocked state drives the ejector rod to move leftward away from the pressure regulating diaphragm, thereby fully opening the bypass valve for pressure relief. When the upper and lower oil cavities of the valve device are restored to balance, the valve port is closed and the medium flow stops.

[0024] 6. In the overpressure cut-off device provided by the present invention, a movement guide hole through which the push rod body can move is provided in the first valve body. The adjusting rod is threadedly fixed to the push rod body through the guide rod portion, and the diameter of the end portion of the guide rod portion is larger than the aperture of the movement guide hole. Such a design enables the outer hexagonal portion of the guide rod portion to be fitted and abutted against the port of the movement guide hole, thereby limiting the reset movement distance of the push rod structure. At the same time, it also prevents the push rod body from disengaging from the movement guide hole under the action of the spring, ensuring the stability and reliability of the overall installation of the push rod structure.

[0025] 7. In the overpressure cut-off device provided by the present invention, this cut-off diaphragm operates according to the pressure difference between the pressure in the lower pressure chamber and the pre-tightening force of the spring. By rotating the cut-off adjustment screw, the compression amount of the cut-off spring can be finely adjusted, thereby linearly changing the pre-tightening force exerted by the cut-off spring on the cut-off diaphragm, which can meet the requirements of different working conditions. When the pressure transmitted to the lower pressure chamber by the first conduit continuously increases, the force on the cut-off diaphragm in the lower pressure chamber increases, thereby pushing the cut-off diaphragm to overcome the pre-tightening force of the cut-off spring and driving the cut-off connecting rod to move upward, and triggering the unlocking action of the push rod structure, thereby realizing the overpressure cut-off control of the valve device.

[0026] 8. In the valve device provided by the present invention, when the valve device is in normal use, the overpressure cut-off device is responsible for conventional pressure regulation in cooperation with the diaphragm pressure regulator through the pressure regulating component. As an independent safety device, the overpressure cut-off device intervenes in the event of extreme overpressure, forming a dual safety protection mechanism. This overpressure cut-off device shares the pressure protection task under extreme working conditions, reduces the burden on the diaphragm pressure regulator under overpressure conditions, and extends its service life. The valve device designed in this way is equipped with an overpressure cut-off device to achieve the dual functions of overpressure cut-off and conventional pressure regulation. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] In order to more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the following will briefly introduce the drawings required for the description of the specific embodiments or the prior art.

[0028] Figure 1 It is a schematic installation structure diagram of the overpressure cut-off device and the valve device provided by the present invention;

[0029] Figure 2 It is a schematic structure diagram of the overpressure cut-off device of the present invention before cutting;

[0030] Figure 3 It is a schematic structure diagram of the overpressure cut-off device of the present invention after cutting;

[0031] Figure 4 It is a schematic cross-sectional structure diagram of the push rod structure of the present invention;

[0032] Figure 5 It is a schematic connection structure diagram of the pressure regulating rod and the pressure regulating screw of the present invention;

[0033] Figure 6 Schematic diagram of the connection structure between the pressure regulating rod and the ejector rod of the present invention;

[0034] Figure 7 Schematic diagram of the structure of the valve device provided by the present invention;

[0035] Figure 8 is Figure 1 Schematic diagram of the structure of the diaphragm pressure regulator shown in.

[0036] Description of the reference numerals: 1. First valve body; 11. Installation concave hole; 12. Pressure regulating channel; 13. Left membrane cavity; 14. Right membrane cavity; 2. Driving handle; 3. Return spring; 4. Push rod structure; 40. Limiting groove; 41. Push rod body; 42. Pressure regulating rod; 421. Guide rod part; 422. Inserting rod part; 43. Ejector rod; 431. Inserting sleeve; 432. Inserting groove; 44. Pressure regulating screw; 45. Pressure regulating spring; 5. Second valve body; 51. Upper pressure cavity; 52. Lower pressure cavity; 53. Locking part; 54. Cut-off adjusting screw; 6. Cut-off diaphragm; 7. Cut-off connecting rod; 71. Limiting end; 8. Cut-off spring; 9. Valve device; 90. Valve pipeline; 91. Bypass valve; 92. Diaphragm pressure regulator; 921. Pressure regulating diaphragm; 922. Lever structure; 923. Round needle; 93. Upper oil cavity; 94. Lower oil cavity; 95. Piston pump assembly; 96. Valve rod assembly; 97. Closing spring; 98. Oil return port; 101. First conduit; 102. Second conduit. Detailed implementation manners

[0037] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings. Apparently, the described embodiments are some but not all of the embodiments of the present invention. All other embodiments obtained by those of ordinary skill in the art without creative efforts based on the embodiments in the present invention belong to the scope of protection of the present invention.

[0038] In the description of the present invention, it should be noted that the terms "first", "second", and "third" are only used for descriptive purposes and cannot be construed as indicating or implying relative importance.

[0039] In the description of the present invention, it should be noted that unless otherwise clearly defined and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific situations.

[0040] In addition, the technical features involved in different embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0041] Embodiment 1

[0042] The following specifically describes this embodiment in conjunction with the accompanying drawings:

[0043] This embodiment provides an overpressure cut-off device as shown in Figures 1 - 6 which is used in cooperation with the valve device 9. It should be understood that the basic structure of this valve device 9 mainly includes an upper oil chamber 93, a lower oil chamber 94, a piston pump assembly 95, a valve stem assembly 96, a closing spring 97, and a diaphragm pressure regulator 92. A bypass valve 91 is provided between the upper oil chamber 93 and the lower oil chamber 94. The diaphragm pressure regulator 92 is used to close or open the bypass valve 91. The function of the bypass valve 91 is to return the oil in the upper oil chamber 93 to the lower oil chamber 94 to restore pressure balance. The working principle of this valve device 9 is as follows: The bypass valve 91 is sealed by the diaphragm pressure regulator 92. Under the continuous oil supply operation of the energized piston pump assembly 95, the insulating oil in the lower oil chamber 94 is injected into the upper oil chamber 93. When the pressure in the upper oil chamber 93 continues to rise, it will push the entire piston pump assembly 95 to move quickly downward, thereby pushing the valve stem assembly 96 to overcome the force of the closing spring 97 to open the valve port; and the bypass valve 91 is opened by the diaphragm pressure regulator 92, so that the oil in the upper oil chamber 93 flows back to the lower oil chamber 94 through the bypass valve 91. As the upper oil chamber 93 loses pressure, the valve stem assembly 96 and the piston pump assembly 95 are driven to move upward by the closing spring 97, thereby closing the valve port.

[0044] The following details the specific implementation of the overpressure cut-off device in this embodiment:

[0045] The overpressure cut-off device includes a cut-off driving mechanism and an overpressure triggering mechanism;

[0046] The cut-off driving mechanism includes a first valve body 1 connected to the valve device 9, a push rod structure 4 movably arranged in the first valve body 1 along a first direction, and a driving handle 2 arranged in the first valve body 1 and linked with the push rod structure 4. A return spring 3 is arranged between the driving handle 2 and the first valve body 1, and the push rod structure 4 extends to connect the diaphragm pressure regulator 92;

[0047] The overpressure trigger mechanism includes a second valve body 5 connected to the first valve body 1 and a cut-off diaphragm 6 and a cut-off connecting rod 7 arranged in the inner cavity of the second valve body 5 in a linkage manner. The cut-off diaphragm 6 separates the inner cavity of the second valve body 5 into an upper pressure chamber 51 and a lower pressure chamber 52, and a cut-off spring 8 is arranged in the upper pressure chamber 51 and pressed against the cut-off diaphragm 6. A first conduit 101 is connected between the valve pipe 90 of the valve device 9 and the lower pressure chamber 52. The cut-off connecting rod 7 moves perpendicular to the first direction under the drive of the cut-off diaphragm 6 and cooperates with the push rod structure 4. The first direction is the length direction of the push rod structure, and the push rod structure 4 has a locked state connected with the cut-off link 7 to form a limit fit, and an unlocked state separated from the cut-off link 7; the push rod structure 4 applies pressure to the diaphragm pressure regulator 92 to close the bypass valve 91 in the locked state, and in the unlocked state is driven by the return spring 3 to move to the side away from the diaphragm pressure regulator 92 to loosen the diaphragm pressure regulator 92, so that the diaphragm pressure regulator 92 opens the bypass valve 91 under the action of oil pressure, thereby realizing the cut-off closure of the valve device.

[0048] The above-mentioned implementation mode is the core technical solution of this embodiment. According to the push rod structure 4, in the locked state, it forms a limit fit with the cut-off link 7 and drives the diaphragm pressure regulator 92 to seal the bypass valve 91. At this time, the valve device 9 is opened normally. When the downstream pressure of the valve pipeline 90 increases and overpressure occurs, the gas is transmitted to the lower pressure chamber 52 through the first conduit to push the cut-off diaphragm 6 upward, and at the same time drives the cut-off link 7 to move upward and separate from the push rod structure 4 to release the limit fit. At this time, the push rod structure 4 moves to the side away from the diaphragm pressure regulator 92 under the drive of the return spring 3 and switches to the unlocked state, while releasing the diaphragm pressure regulator 92, so that the diaphragm pressure regulator 92 opens the bypass valve 91 under the action of oil pressure, thereby filling the upper oil chamber. The oil in 93 flows back to the lower oil chamber 94 through the bypass valve 91. As the upper oil chamber loses pressure, the valve device closes the valve port under the action of its own closing spring. The advantage of adopting this technical solution is that the overpressure cut-off device can realize rapid shut-off and closure of the valve under overpressure state, and the shut-off response is fully automated, avoiding reliance on manual monitoring and operation, and reducing the risk of human misjudgment or delay; this overpressure cut-off device is an independent component, which is easy to repair or replace, reducing maintenance costs, and is suitable for valves with large flow fluctuations or sudden pressure changes. It can quickly stabilize the system and avoid pressure accumulation caused by insufficient adjustment speed of the diaphragm pressure regulator, thereby significantly reducing safety accidents such as leakage and explosion caused by overpressure, and ensuring the safety of personnel and equipment.

[0049] Combine Figures 2 - 3As shown, a limiting structure for forming a limiting fit is provided between the push rod structure 4 and the cutting link 7. The limiting structure includes a limiting groove 40 provided on the push rod structure 4 and a limiting end 71 provided at one end of the cutting link 7. The limiting end 71 penetrates into the first valve body 1 and abuts against the limiting groove 40 in a matching manner. The moving direction of the push rod structure 4 is perpendicular to the moving direction of the cutting link 7. Further preferably, an installation concave hole 11 extending perpendicular to the first direction is provided on the side wall of the first valve body 1. The push rod structure 4 moves through the installation concave hole 11. The second valve body 5 is fixed in the installation concave hole 11 by a locking member 53 and is perpendicularly connected to the first valve body. The cutting diaphragm 6 drives the cutting link 7 to move into the installation concave hole 11 under the action of the cutting spring 8, that is, the cutting link 7 drives the limiting end 71 to penetrate into the installation concave hole 11, and the limiting end 71 abuts against the limiting groove 40 to form a limiting fit with the push rod structure 4, thereby limiting and holding the push rod structure 4 in a locked state and preventing it from operating. The push rod structure 4 applies a pressure to close the bypass valve to the diaphragm pressure regulator 92. Only when the cutting link 7 moves upward to drive the limiting end 71 to disengage from the limiting groove 40 can the limiting fit between the cutting link 7 and the push rod structure 4 be released, so that the push rod structure 4 moves leftward under the action of the return spring 3 to release the diaphragm pressure regulator 92. The diaphragm pressure regulator 92 will be pushed by the oil pressure in the upper oil chamber to open the bypass valve. This structural design utilizes the rapid response and precise pressure control of the overpressure cut-off device to actively relieve pressure and close the valve device to reduce potential safety hazards, prevent continuous pressure rise, and avoid gas overload.

[0050] In this embodiment, in order to achieve the conventional pressure regulation during the opening operation of the valve device 9, in combination with Figures 2 - 6As shown, the first valve body 1 is connected to the valve device 9 to form an installation cavity for accommodating the diaphragm pressure regulator 92. The diaphragm pressure regulator 92 divides the installation cavity into a left diaphragm cavity 13 and a right diaphragm cavity 14. A second conduit 102 is communicatively provided between the right diaphragm cavity 14 and the valve conduit 90. The push rod structure 4 includes a push rod body 41 that forms a limit fit with the cut-off link 7, and a pressure regulating assembly that is elastically connected between the push rod body 41 and the diaphragm pressure regulator 92. Further preferably, the pressure regulating assembly includes a pressure regulating rod 42, a pressure regulating screw 44, a pressure regulating spring 45, and a push rod 43 disposed in the regulating channel of the first valve body 1. The pressure regulating screw 44 is threadedly connected in the regulating channel. The pressure regulating rod 42 moves in the first direction through the pressure regulating screw 44 and is movably connected to the push rod 43. The push rod 43 extends out of the regulating channel and contacts the diaphragm pressure regulator 92, and is slidable relative to the pressure regulating rod 42 within a set distance in the first direction. The pressure regulating spring 45 is disposed between the push rod 43 and the pressure regulating screw 44. The push rod body 41 is fixedly connected to one end of the pressure regulating rod 42 away from the push rod 43. A torque transmission fit is formed between the pressure regulating rod 42 and the pressure regulating screw 44, so that when the pressure regulating rod 42 rotates following the push rod body 41, it drives the pressure regulating screw 44 to move along the regulating channel. The advantage of this design is that in the pressure regulating system of the valve device, the gas pressure downstream of the medium channel can be conducted to the right diaphragm cavity 14 through the second conduit 102 to apply pressure to the pressure regulating diaphragm 921. According to the pressure exerted by the push rod 43 on the left side of the pressure regulating diaphragm 921 and the pressure exerted by the right diaphragm cavity on the right side, the pressure regulating diaphragm 921 makes a reciprocating motion in the pressure regulating cavity under the action of the pressure difference between the two. Moreover, when the push rod 43 is pushed by the pressure regulating diaphragm 921, it will adjust its displacement within a set distance relative to the push rod structure 4, so that the diaphragm pressure regulator 92 moderately opens the bypass valve according to the change of the pressure in the right diaphragm cavity, and finally controls the gas pressure to be maintained within the specified pressure range by adjusting the opening of the valve, realizing the constant pressure function. In summary, the automatic pressure regulating function of the valve device within the specified pressure range is realized through the cooperation of the diaphragm pressure regulator and the pressure regulating assembly.

[0051] It is further preferred that the driving handle 2 and the push rod structure 4 are rotatably arranged on the first valve body 1, the pressure-regulating screw 44 is provided with an inner hexagonal hole, and the pressure-regulating rod 42 includes a guide rod portion 421 that matches and passes through the inner hexagonal hole, that is, the outer wall of the guide rod portion 421 is an outer hexagonal structure. Obviously, the pressure-regulating screw 44 can also be designed with other polygonal inner hole structures for use in conjunction with the guide rod portion 421, as long as it can cooperate with the pressure-regulating screw to transmit torque when the pressure-regulating rod 42 rotates. In addition, the guide rod portion 421 and the guide rod portion 421 are provided with fixing holes, and one end of the push rod body 41 is fixed to the fixing hole, specifically, one end of the push rod body 41 is threadedly fastened in the fixing hole. With this structural arrangement, the push rod body 4 When the pressure regulating rod 42 and the push rod 43 are driven to move linearly, the pressure regulating rod 42 slides along the axis of the inner hexagonal hole (the inner wall of the hole is not engaged with the push rod), and motion and force are transmitted only between the push rod and the push rod 43, ensuring that the push rod structure 4 drives the push rod 43 to move quickly in the unlocked state to achieve overpressure cutoff of the valve; in addition, when the regulating rod is driven by the push rod body to rotate, the adjusting screw is driven to rotate synchronously (through the matching of the corners of the inner hexagonal hole and the outer wall of the pressure regulating rod), so that the adjusting screw changes its own axial position by utilizing the mechanical characteristics of the threaded pair, and the adjusting spring is compressed or released by the adjusting screw to achieve precise adjustment of the spring preload force, thereby achieving the purpose of accurately adjusting the triggering pressure threshold of the push rod acting on the pressure regulating diaphragm to meet the needs of different working conditions.

[0052] In order to limit the reset movement distance of the push rod structure 4 in the unlocked state, as shown in FIG. Figure 3 As shown, a spring chamber suitable for accommodating the reset spring 3 is formed between the driving handle and the first valve body 1. A motion guide hole extending in a first direction and connected to the adjustment channel is provided within the first valve body 1. The push rod body 41 is movably disposed within the motion guide hole. The end diameter of the guide rod portion 421 is larger than the diameter of the push rod through-hole. This design allows the outer hexagonal portion of the guide rod portion 421 to fit against the end of the motion guide hole, thereby limiting the reset travel distance of the push rod structure 4 and preventing the push rod body 41 from disengaging from the motion guide hole under the action of the spring, thereby ensuring the stability and reliability of the overall installation of the push rod structure.

[0053] The diaphragm pressure regulator 92 includes a pressure regulating diaphragm 921 connected to the push rod 43 in the pressure regulating chamber, a tilting rod structure 922 swingingly arranged between the pressure regulating diaphragm 921 and the bypass valve 91, and a round needle 923 set in the central through hole of the bypass valve 91 and pressed by the tilting rod structure 922. Since the pressure regulating diaphragm 921 is pressed by the push rod 43 and the pressure is transmitted to the tilting rod structure 922, the round needle 923 is pressed by the tilting rod structure 922, thereby closing the bypass valve. In order to achieve that the push rod 43 can move a certain distance relative to the pressure regulating rod 42 when pushed by the pressure regulating diaphragm 921, such as Figure 6As shown, the ejector rod 43 includes a connecting sleeve formed at one end thereof and a plug-in groove 432 provided in the connecting sleeve. The pressure regulating rod 42 includes a plug rod portion 422 inserted into the plug-in groove 432. There is a movable gap between the plug rod portion 422 and the plug-in groove 432, so that the plug rod portion 422 can move in the first direction in the plug-in groove 432. Specifically, the cross-sectional shapes of the plug-in groove 432 and the plug rod portion 422 are respectively T-shaped structures that match each other. This installation structure is simple and convenient for the assembly connection between the pressure regulating rod 42 and the ejector rod 43. When the push rod body 41 drives the pressure regulating rod 42 to move rightward toward the side close to the pressure regulating diaphragm 921, it will push the ejector rod 43 to move, so as to drive the ejector rod 43 to press against the pressure regulating diaphragm 921; conversely, when the push rod body 41 drives the pressure regulating rod 42 to move rightward toward the side close to the pressure regulating diaphragm 921, it will pull the ejector rod 43 to move, so as to drive the ejector rod 43 to separate from the pressure regulating diaphragm 921. It can be seen from the above structure that according to the fixed connection between the push rod body 41 and the pressure regulating rod 42, the ejector rod 43 and the pressure regulating rod 42 are movably connected. The membrane pressure regulator and the pressure regulating component are used to regulate the pressure of the valve within the set pressure range. The pressure regulating process is as follows: when the valve is opened, the downstream pressure of the medium passage increases, and the pressure is conducted to the right membrane cavity 14 through the second conduit 102, thereby driving the pressure regulating diaphragm 921 to move leftward to push open the ejector rod 43, so that the ejector rod 43 can move a certain distance relative to the adjusting rod by compressing the pressure regulating spring 45. Since the pressure regulating diaphragm 921 slightly loosens the toggle structure 922, the flow rate of the bypass valve 91 can be adjusted in this way, and then the valve opening can be adjusted to close to reduce the pressure. This membrane pressure regulator 92 timely controls the opening of the valve according to the air pressure to achieve the functions of pressure regulation and voltage stabilization, and keeps the outlet pressure stable; once the flow pressure is too large, resulting in the failure of the membrane pressure regulator 92 or it cannot be closed, at this time, the overpressure cut-off device intervenes, and the push rod structure 4 in the unlocked state drives the ejector rod 43 to move leftward away from the pressure regulating diaphragm 921, so as to completely open the bypass valve for pressure relief. When the upper and lower oil cavities of the valve device are restored to balance, the valve port is closed and the medium flow stops.

[0054] Combined with Figures 2 - 3As shown, the second valve body 5 includes an upper cylindrical portion connected to the upper side of the upper pressure chamber 51 and a lower cylindrical portion connected to the lower side of the lower pressure chamber 52. An adjusting screw 54 for cutting is threadedly connected inside the upper cylindrical portion. One end of the cutting spring 8 abuts against the adjusting screw 54 for cutting, and the other end abuts against the cutting diaphragm 6. This cutting diaphragm 6 operates according to the pressure difference between the pressure in the lower pressure chamber 52 and the pre-tightening force of the spring. By rotating the adjusting screw 54 for cutting, the compression amount of the cutting spring 8 can be finely adjusted, thereby linearly changing the pre-tightening force exerted by the cutting spring 8 on the cutting diaphragm 6, which can meet the requirements of different working conditions. When the pressure conducted by the first conduit to the lower pressure chamber 52 continuously increases, the force exerted on the cutting diaphragm 6 by the lower pressure chamber 52 increases, thereby pushing the cutting diaphragm 6 to overcome the pre-tightening force of the cutting spring and driving the cutting connecting rod 7 to move upward, and triggering the unlocking action of the push rod structure, thereby realizing the overpressure cutting control of the valve device.

[0055] To reliably achieve the installation connection between the first valve body 1 and the second valve body 5, threaded joints for threadedly connecting to the lower cylindrical portion and the installation concave hole 11 are provided at both ends of the locking member 53. The locking member 53 has a guiding hole through which the cutting connecting rod 7 can pass. Sealing rings or sealants are respectively provided between the locking member 53 and the first valve body 1 and the second valve body 5. The installation and fixation between the first valve body 1 and the second valve body 5 are realized through the locking member 53. The installation structure is simple, which is convenient for subsequent maintenance, realizes the modular assembly effect, improves the installation efficiency, and realizes the sealing effect between the locking member and the first valve body and the second valve body respectively through the sealing ring or the sealant, ensuring the sealing performance of the product.

[0056] Embodiment 2

[0057] This embodiment provides as Figure 1 、 Figures 7 - 8A valve device 9 shown in the figure includes a valve body and the overpressure cut-off device described in Example 1, wherein the valve body includes an upper oil chamber 93 and a lower oil chamber 94 that are sealed and separated, and a piston pump assembly 95 that is movably arranged between the upper oil chamber 93 and the lower oil chamber 94, and a valve stem assembly 96 connected to the piston pump assembly 95, wherein the valve stem assembly 96 includes a valve stem and a valve disk arranged on the valve stem opposite to the valve port, and a closing spring 97 connected to the valve stem assembly 96 is provided in the valve body, and is used to drive the valve disk to close the valve port and apply an elastic force to the valve stem assembly 96 and the piston pump assembly 95 to move upward. The bypass valve 91 is arranged at The side wall of the upper oil chamber 93 and the side wall of the lower oil chamber 94 are provided with an oil return port 98 connected to the bypass valve 91. This piston pump assembly 95 is an existing structure and will not be described in detail. The bypass valve 91 and the oil return port 98 are connected through the right diaphragm chamber 14. A round needle 923 is contained in the central through hole of the bypass valve 91, and one end of the tilting rod structure 922 is against the round needle 923, and the other end is against the right side of the pressure regulating diaphragm 921, and the left side of the pressure regulating diaphragm 921 is supported by the push rod 43 of the push rod structure 4. The push rod 43 applies pressure to the pressure regulating diaphragm 921 to seal the bypass valve 91 with the round needle 923, thereby achieving sealing between the upper oil chamber 93 and the lower oil chamber 94. Therefore, during the opening process of the valve device 9, the piston pump assembly 95 is energized, and the piston pump continuously injects the oil in the lower oil chamber 94 into the upper oil chamber 93, so that the oil pressure on the side of the upper oil chamber 93 increases, which pushes the piston pump assembly 95 to move downward as a whole. Since the piston pump is connected to the valve stem assembly 96 through the main shaft, the valve stem assembly 96 is pushed to overcome the pressure of the closing spring 97 to open the valve port, so that the valve port in the valve is continuously pushed downward to allow gas to pass through.

[0058] The following describes the pressure regulation process and overpressure cut-off operation of the valve device:

[0059] When the valve port is opened, the gas enters the right diaphragm chamber 14 on the right side of the pressure regulating diaphragm 921 through the second conduit 102. The pressure on the right side of the pressure regulating diaphragm 921 increases, and pushes the pressure regulating diaphragm 921 to the left. As the pressure in the right diaphragm chamber 14 continues to increase, the pressure regulating diaphragm 921 will offset the pressure of the push rod 43 and move to the left to loosen the tilting rod structure 922. Then the tilting rod structure 922 releases the round needle 923 against the bypass valve 91, so that the high-pressure oil in the upper oil chamber 93 pushes the round needle 923 open, passes through the bypass valve 91 and flows through the return oil port 98 to the bottom of the piston pump assembly 95. The pressure in the upper oil chamber loses pressure, and the piston pump assembly and the valve stem assembly are pushed upward by the elastic force of the closing spring 97, thereby adjusting the valve port to close through the valve disc to reduce the valve port pressure.

[0060] When the valve disc rises to close the valve port, the amount of gas passing through decreases. At the same time, the gas entering the right diaphragm cavity 14 through the second conduit 102 decreases, causing the pressure regulating diaphragm 921 to be pushed back by the push rod 43 of the push rod structure 4 again. The bypass valve 91 is sealed again, causing the oil pressure in the upper oil cavity 93 to gradually increase, driving the piston pump assembly 95 to move downward again, and the valve port of the valve to move downward, thus realizing the pressure regulating function reciprocally.

[0061] When the downstream pressure at the valve port continuously increases, gas enters the lower pressure cavity through the first conduit 101, causing the cut-off diaphragm 6 to be pressed upward to exert force. As the pressure continuously increases, the cut-off diaphragm 6 moves upward to overcome the pre-tightening force of the cut-off spring 8 and drives the cut-off connecting rod 7 to move upward, thereby releasing the limit cooperation between the cut-off connecting rod 7 and the push rod structure 4. Refer to Figure 2 and Figure 3 , at this time, the push rod structure 4 switches from the locked state to the unlocked state, causing the push rod structure 4 to drive the push rod 43 to move leftward significantly under the action of the return spring 3. The pressure regulating diaphragm 921 loses the pressure of the push rod 43, causing the round needle 923 in the bypass valve 91 to be pushed open by the oil pressure, so that the insulating oil in the upper oil cavity 93 flows back to the lower oil cavity 94 through the bypass valve 91 and the oil return port 98, thus restoring the balance between the upper and lower oil cavities. At this time, the valve disc drives the valve rod assembly to move upward under the action of the closing spring and closes the valve port.

[0062] In summary, when this valve device is in normal use, the overpressure cut-off device is responsible for conventional pressure regulation in cooperation with the pressure regulating component and the diaphragm pressure regulator. As an independent safety device, the overpressure cut-off device intervenes in the event of extreme overpressure, forming a dual safety protection mechanism. This overpressure cut-off device shares the pressure protection task under extreme working conditions, reduces the burden on the diaphragm pressure regulator under overpressure conditions, and extends its service life. The valve device designed in this way is equipped with an overpressure cut-off device to achieve the dual functions of overpressure cut-off and conventional pressure regulation.

[0063] Obviously, the above embodiments are only examples given for clear illustration and are not limitations on the implementation manners. For those of ordinary skill in the art, other different forms of changes or modifications can be made based on the above description. It is not necessary and impossible to enumerate all the implementation manners here. And the obvious changes or modifications derived therefrom are still within the protection scope of the present invention.

Claims

1. An overpressure cut-off device is used in cooperation with a valve device (9). The valve device (9) includes a bypass valve (91) connected between an upper oil chamber (93) and a lower oil chamber (94), and a diaphragm pressure regulator (92) for closing or opening the bypass valve (91); characterized in that, Comprising: A cutting drive mechanism, including a first valve body (1) connected to a valve device (9), a push rod structure (4) movably arranged in the first valve body (1) along a first direction, and a drive handle (2) arranged in the first valve body (1) and linked with the push rod structure (4). A return spring (3) is arranged between the drive handle (2) and the first valve body (1). The push rod structure (4) extends to connect to the diaphragm pressure regulator (92); An overpressure trigger mechanism, including a second valve body (5) connected to the first valve body (1), a cut-off diaphragm (6) and a cut-off connecting rod (7) movably arranged in the inner cavity of the second valve body (5), and an upper pressure chamber (51) and a lower pressure chamber (52) formed by the cut-off diaphragm (6) separating the inner cavity of the second valve body (5). A cut-off spring (8) is arranged in the upper pressure chamber (51) and presses against the cut-off diaphragm (6). A first conduit (101) is connected between the valve conduit (90) of the valve device (9) and the lower pressure chamber (52). The cut-off connecting rod (7) moves perpendicular to the first direction under the drive of the cut-off diaphragm (6) and cooperates with the push rod structure (4). The push rod structure (4) has a locked state in which it forms a limit fit with the cut-off connecting rod (7), and an unlocked state in which it is separated from the cut-off connecting rod (7). The push rod structure (4) applies a pressure to close the bypass valve (91) to the diaphragm pressure regulator (92) in the locked state, and moves away from the diaphragm pressure regulator (92) under the drive of the return spring (3) in the unlocked state to release the diaphragm pressure regulator (92); The first valve body (1) is connected to the valve device (9) to form an installation cavity for accommodating the diaphragm pressure regulator (92). The diaphragm pressure regulator (92) divides the installation cavity into a left diaphragm cavity (13) and a right diaphragm cavity (14). A second conduit (102) is communicated between the right diaphragm cavity (14) and the valve conduit (90). The push rod structure (4) includes a push rod body (41) that forms a limit fit with the cut-off connecting rod (7), and a pressure regulating component elastically connected between the push rod body (41) and the diaphragm pressure regulator (92).

2. The overpressure cut-off device according to claim 1, characterized in that: A limit structure for forming a limit fit is arranged between the push rod structure (4) and the cut-off connecting rod (7). The limit structure includes a limit groove (40) arranged on the push rod structure (4), and a limit end (71) arranged at one end of the cut-off connecting rod (7). The limit end (71) penetrates into the first valve body and abuts against the limit groove (40) in a matching manner.

3. The overpressure cut-off device according to claim 2, characterized in that: An installation concave hole (11) extending perpendicular to the first direction is arranged on the side wall of the first valve body (1). The push rod structure (4) moves through the installation concave hole (11). The second valve body (5) is fixed in the installation concave hole (11) by a locking member (53) and is vertically connected to the first valve body. The cut-off connecting rod (7) drives the limit end (71) to penetrate into the installation concave hole and cooperate with the limit groove (40) on the push rod structure (4).

4. The overpressure cut-off device according to claim 1, characterized in that: The pressure regulating assembly includes a pressure regulating rod (42), a pressure regulating screw (44), a pressure regulating spring (45) and a push rod (43) disposed in the regulating channel of the first valve body (1). The pressure regulating screw (44) is threadedly connected in the regulating channel. The pressure regulating rod (42) moves through the pressure regulating screw (44) along a first direction and is movably connected to the push rod (43). The push rod (43) extends out of the regulating channel and contacts the diaphragm pressure regulator (92), and is slidable relative to the pressure regulating rod (42) within a set distance along the first direction. The pressure regulating spring (45) is disposed between the push rod (43) and the pressure regulating screw (44). The push rod body (41) is fixedly connected to one end of the pressure regulating rod (42) away from the push rod (43). A transmission fit for transmitting torque is formed between the pressure regulating rod (42) and the pressure regulating screw (44), so that when the pressure regulating rod (42) rotates following the push rod body (41), the pressure regulating screw (44) is driven to move along the regulating channel.

5. The overpressure cut-off device according to claim 4, characterized in that: The pressure regulating screw is provided with an internal hexagonal hole. The pressure regulating rod (42) includes a guide rod portion (421) that fits through the internal hexagonal hole. A fixing hole is provided on the guide rod portion (421). One end of the push rod body (41) is fixed to the fixing hole.

6. The overpressure cut-off device according to claim 5, characterized in that: The driving handle (2) and the push rod structure (4) are rotatably disposed on the first valve body (1). A spring cavity suitable for accommodating the return spring (3) is formed between the driving handle and the first valve body (1). A movement guide hole extending along the first direction and connecting the regulating channel is provided in the first valve body (1). The push rod body (41) is movably disposed in the movement guide hole. The diameter of the end portion of the guide rod portion (421) is larger than the aperture of the push rod through hole.

7. The overpressure cut-off device according to any one of claims 4-6, characterized in that: The push rod (43) includes a connecting sleeve formed at one end thereof and a plugging groove (432) provided in the connecting sleeve. The pressure regulating rod (42) includes a plugging rod portion (422) plugged into the plugging groove (432). The plugging rod portion (422) is movable along the first direction in the plugging groove (432). The cross-sectional shapes of the plugging groove (432) and the plugging rod portion (422) are respectively T-shaped structures that are adapted to each other.

8. The overpressure cut-off device according to claim 3, characterized in that: The second valve body (5) includes an upper cylindrical portion connected to the upper side of the upper pressure chamber (51) and a lower cylindrical portion connected to the lower side of the lower pressure chamber (52). A cut-off adjusting screw (54) is threadedly connected in the upper cylindrical portion. One end of the cut-off spring (8) abuts against the cut-off adjusting screw (54), and the other end thereof abuts against the cut-off diaphragm (6).

9. The overpressure cut-off device according to claim 8, characterized in that: Both ends of the locking member (53) are provided with threaded joints threadedly connected to the lower cylindrical portion and the mounting concave hole (11). The locking member (53) has a guiding hole through which the cut-off connecting rod (7) can pass. Sealing rings or sealants are respectively provided between the locking member (53) and the first valve body (1) and the second valve body (5).

10. The overpressure cut-off device according to claim 1, characterized in that: The diaphragm pressure regulator (92) includes a pressure regulating diaphragm (921) disposed in the pressure regulating chamber and connected to the push rod (43), a lever structure (922) swingably disposed between the pressure regulating diaphragm (921) and the bypass valve (91), and a round needle (923) pressed by the lever structure (922) and disposed in the central through hole of the bypass valve (91).

11. A valve device, characterized in that, It includes a valve body and the overpressure cut-off device according to any one of claims 1-10. The valve body includes an upper oil chamber (93) and a lower oil chamber (94) that are sealed and separated, a piston pump assembly (95) movably disposed between the upper oil chamber (93) and the lower oil chamber (94), and a valve stem assembly (96) connected to the piston pump assembly (95). The valve stem assembly (96) includes a valve disc opposite to the valve port, and a closing spring (97) connecting the valve stem assembly (96) is provided in the valve body. The bypass valve (91) is disposed on the side wall of the upper oil chamber (93), and an oil return port (98) communicating with the bypass valve (91) is provided on the side wall of the lower oil chamber (94).

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