Self-closing valve with over-temperature protection structure

Abstract

The application discloses a self-closing valve with an over-temperature protection structure, relates to the technical field of self-closing valves, and comprises a valve body, a left flow channel, a middle valve cavity and a right flow channel are arranged in the valve body, a switch valve assembly is arranged in the left flow channel, a high-low pressure self-closing assembly is arranged at the bottom of the valve body and penetrates through and is connected with a skin film, and the top of the high-low pressure self-closing assembly slides and penetrates through a valve cover; the high-low pressure self-closing assembly is arranged to indicate low-pressure self-closing, high-pressure self-closing, normal working and over-temperature self-closing states, and can cooperate with the switch valve assembly to detect the sealing property of the self-closing valve itself; an over-temperature protection assembly is arranged in the valve cover, when the temperature is greater than a preset value, the over-temperature protection assembly is actuated to push a pull indication assembly to move, the high-low pressure self-closing assembly is self-closed, and the pull indication assembly is used to indicate over-temperature self-closing, thereby improving the safety of the self-closing valve.

Description

Technical Field

[0001] This invention relates to the field of self-closing valve technology, and in particular to a self-closing valve with an over-temperature protection structure. Background Technology

[0002] A self-closing valve is a safety device with an automatic shut-off function. Its core function is to automatically cut off the passage without manual operation when the system (such as gas, pipeline fluid, etc.) experiences abnormal operating conditions, thereby preventing safety accidents such as leakage, explosion, and poisoning.

[0003] Chinese patent CN223360025U discloses an automatic shut-off valve for gas pipeline leaks and its self-closing valve. This automatic shut-off valve has a vent hole in the middle of the housing, a diaphragm sealed to one edge of the housing, a connecting structure on the edge of the housing, and an air inlet between the connecting structure and the diaphragm. The connecting structure is sealed to the inner wall of the gas pipeline. The self-closing valve has a timer on the valve body, a closing device at the air inlet end, and an automatic shut-off valve for gas pipeline leaks at the air outlet end. This solves the problem that existing technologies lack a way to automatically shut off gas pipelines when leaks occur, thus affecting gas safety. This automatic shut-off valve and its self-closing valve automatically close when a gas leak occurs, and the closing device further ensures the effective shut-off of the leak.

[0004] In use, it has been found that self-closing valves with similar technologies can shut off leaks, but they cannot provide indication after overheating or after self-closing due to overheating. In addition, existing self-closing valves cannot perform self-sealing tests.

[0005] Therefore, it is necessary to propose a self-closing valve with an over-temperature protection structure to solve the above problems. Summary of the Invention

[0006] The purpose of this invention is to provide a self-closing valve with an over-temperature protection structure to solve the problems mentioned in the background art.

[0007] To achieve the above objectives, the present invention provides the following technical solution: a self-closing valve with an over-temperature protection structure, comprising a valve body having a left flow channel, a middle valve chamber and a right flow channel inside, and a switching valve assembly disposed in the left flow channel;

[0008] The high and low pressure self-closing assembly is located at the bottom of the middle valve chamber and can block the right flow channel. An elastic element is provided between it and the bottom of the middle valve chamber.

[0009] The valve cover has a groove on its top, and its sealing device is located on the top of the valve body, with a diaphragm between it and the valve body.

[0010] The lifting indicator assembly has its bottom penetrating and connected to the diaphragm, and its top sliding through the valve cover. It can close the high and low pressure self-closing assembly and indicate the low pressure self-closing, high pressure self-closing, normal operation and over-temperature self-closing status. It can also cooperate with the switching valve assembly to detect the sealing performance of the self-closing valve itself.

[0011] An over-temperature protection component is installed inside the valve cover. When the temperature exceeds a preset value, the over-temperature protection component activates and pushes the lifting indicator component to move, causing the high and low pressure self-closing components to close automatically and simultaneously causing the lifting indicator component to indicate over-temperature self-closing.

[0012] Preferably, the over-temperature protection component includes:

[0013] An elastic compression element is fitted over the pull indicator assembly and placed at the bottom of the valve cover;

[0014] A pressure plate, which is sleeved on the outside of the lifting indicator assembly and connected to the bottom of the elastic compression member;

[0015] The limiting component is lower than the pressure plate, with one end located outside the valve cover and the other end extending into the valve cover to limit the pressure plate.

[0016] The elastic thermal element can deform when the temperature reaches the preset value. It is placed in the storage groove opened in the side wall of the valve cover and is connected to the limiting component for limiting.

[0017] The protective cover is sealed to the inner wall of the storage compartment.

[0018] Preferably, the lifting indicator component includes:

[0019] The external indicator hollow rod has a sealed movable passage through the valve cover at its top and a passage through the diaphragm at its bottom. The bottom of the rod is connected to the diaphragm through the diaphragm pressing assembly.

[0020] An elastic annular support is threaded to the bottom outer wall of the diaphragm clamping assembly;

[0021] The first indicator is sleeved on the outer wall of the top end of the outer hollow indicator rod;

[0022] The armature is placed inside an elastic ring-shaped support;

[0023] The permanent magnet is located on top of the high and low voltage self-closing assembly.

[0024] Preferably, the lifting indicator component further includes:

[0025] The inner indicator rod is sealed and movably sleeved inside the outer hollow indicator rod, with its top end lower than the outer hollow indicator rod and its bottom end able to abut against the high and low pressure self-closing assembly.

[0026] A transparent sealing component, which is threadedly fixed to the outer wall of the top of the outer indicator hollow rod;

[0027] The flexible indicator is placed between the transparent sealing part and the inner indicator rod, and the part below the outer hollow indicator rod is sprayed with indicator paint.

[0028] The adjusting component has its bottom rotatably connected to the top of the inner indicator rod, and its middle part passes through the transparent sealing component and is threadedly connected to the transparent sealing component.

[0029] Preferably, the elastic annular support includes an upper annular support portion, and its bottom is connected to a lower annular support portion via an elastic portion.

[0030] Preferably, there is a movable gap between the first indicator and the valve cover, and the bottom of the first indicator is provided with an annular elastic layer.

[0031] Preferably, the elastic force of the elastic compression member is greater than the elastic force of the elastic part, and the elastic force of the elastic member is greater than the elastic force of the elastic compression member.

[0032] Preferably, the membrane pressing assembly includes:

[0033] The retaining ring is threadedly connected to the middle of the outer hollow indicator rod and is located at the bottom of the diaphragm;

[0034] The extrusion component is sleeved in the middle of the outer indicator hollow rod and located on top of the diaphragm;

[0035] The nut, with its threads fitted into the middle of the outer hollow indicator rod and located at the top of the extrusion part, abuts against the extrusion part.

[0036] Preferably, the inner wall of the right flow channel is provided with a sealing protrusion that cooperates with the high and low pressure self-closing assembly.

[0037] Preferably, the high and low voltage self-closing assembly includes:

[0038] High and low pressure elastic sealing plugs are placed in the right flow channel to block the right flow channel, and a sliding rod is provided on the left side;

[0039] The boss is located at the bottom of the central valve chamber directly below the lifting indicator assembly, and its top is slidably connected to the slide bar limiter. A pressure member that restricts the slide bar from sliding up and down is detachably connected to its top.

[0040] A clearance groove is provided on the slide bar directly below the lift indicator assembly;

[0041] A sliding member is disposed in the clearance groove and is slidably connected to the clearance groove. The bottom of the sliding member is provided with a guide part that is slidably connected to the sliding member and fixedly connected to the middle valve cavity. An inclined groove is provided in the middle part, and a receiving groove for accommodating a permanent magnet is provided at the top of the inclined groove. A straight groove is provided at the top of the inclined groove, and a mating rod that is fixedly connected to the side wall of the clearance groove is provided in the inclined groove.

[0042] The technical effects and advantages of this invention are as follows:

[0043] 1. This invention utilizes the cooperation between the switching valve assembly, high and low pressure self-closing assembly, over-temperature protection assembly, and lifting indicator assembly. When the temperature exceeds a preset value, the elastic thermal element deforms, causing the limiting member to slide outward and releasing the limit on the pressure plate. Under the elastic force of the elastic compression member, the pressure plate is pushed downward and simultaneously pushed. The downward movement of the pressure plate causes the outer hollow indicator rod, inner indicator rod, armature, permanent magnet, and sliding member to slide downward. When the sliding member slides down to the bottom, the wedge-shaped cooperation between the inclined groove and the matching rod causes the sliding rod to slide to the left and block the right flow channel, thereby achieving over-temperature self-closing.

[0044] 2. This invention utilizes the cooperation between the switching valve assembly, high and low pressure self-closing assembly, over-temperature protection assembly, and lifting indicator assembly. During over-temperature self-closing, after the sliding member reaches its bottom, the elastic compression member pushes the outer hollow indicator rod and inner indicator rod downwards. The inner indicator rod slides upwards relative to the outer hollow indicator rod, compressing the elastic indicator into the transparent sealing member. At this point, the portion of the elastic indicator coated with indicator paint enters the transparent sealing member, allowing observation of the painted portion. This state represents the over-temperature self-closing state, thus achieving over-temperature self-closing indication. This serves as a reminder to operators of high-temperature shutdown, facilitating hazard identification and preventing safety accidents.

[0045] 3. This invention utilizes the cooperation between the switching valve assembly, low-pressure self-closing assembly, high-pressure self-closing assembly, over-temperature protection assembly, and indicating assembly. When the sealing performance of the self-closing valve needs to be tested, firstly, the switching valve assembly is opened to put the self-closing valve into normal working condition. Then, one hand firmly grasps the first indicating element, keeping it in this position. With the other hand, the adjusting element is rotated downwards to change the high and low pressure self-closing assembly from the open state to the closed state. The adjusting element is then pressed down. After a period of time, the position of the first indicating element is observed. If the self-closing valve itself has poor sealing performance and leakage, resulting in a low-pressure state in the valve chamber and diaphragm, the outer hollow indicating rod moves down to the low-pressure self-closing indicating state. By observing the position of the first indicating element, if it is in the low-pressure self-closing state, it indicates that the self-closing valve itself has air leakage; if it is in the normal working state, it indicates that the self-closing valve itself has good sealing performance. This allows for rapid testing of the self-closing valve's sealing performance. Attached Figure Description

[0046] Figure 1 This is a schematic diagram of the overall structure of the present invention.

[0047] Figure 2 This is a cross-sectional view of the overall structure of the present invention.

[0048] Figure 3This is a schematic diagram of the high and low voltage self-closing component structure in this invention.

[0049] Figure 4 In this invention Figure 3 Schematic diagram of the cross-section of the structure.

[0050] Figure 5 This is a three-dimensional cross-sectional view of the structural connection between the valve cover, diaphragm, over-temperature protection component and lifting indicator component in this invention.

[0051] Figure 6 This is a schematic diagram of the three-dimensional structure of the high and low pressure elastic sealing plug in this invention.

[0052] Figure 7 In this invention Figure 6 Exploded view of a structural component.

[0053] Figure 8 This is a three-dimensional cross-sectional view of the lifting indicator component in this invention.

[0054] Figure 9 This is a cross-sectional view of the lifting indicator component structure in this invention.

[0055] Figure 10 In this invention Figure 9 Enlarged schematic diagram of structure A in the middle.

[0056] Figure 11 This is a schematic diagram of the elastic ring support structure in this invention.

[0057] In the diagram: 1. Valve body; 101. Left flow channel; 102. Middle valve chamber; 103. Right flow channel; 1031. Sealing protrusion; 2. High and low pressure self-closing assembly; 21. High and low pressure elastic sealing plug; 22. Slide rod; 23. Boss; 24. Pressing element; 25. Clearance groove; 26. Sliding element; 27. Guide part; 28. Inclined groove; 29. ​​Receiving groove; 210. Matching rod; 3. Valve cover; 31. Recessed groove; 32. Receiving groove; 4. Switch valve assembly; 5. Diaphragm pressing assembly; 51. Retaining ring; 52. Extrusion element; 53. Nut; 6. Diaphragm 7. Over-temperature protection component; 71. Elastic compression component; 72. Pressure plate; 73. Limiting component; 74. Elastic thermal element; 75. Protective cover; 8. Lifting indicator component; 81. Outer hollow indicator rod; 82. Elastic annular support; 821. Upper annular support; 822. Elastic part; 823. Lower annular support; 83. First indicator; 84. Armature; 85. Permanent magnet; 86. Inner indicator rod; 87. Transparent sealing component; 88. Elastic indicator; 89. Adjusting component; 810. Annular elastic layer; 9. Sealing snap-fit ​​component; 10. Elastic component. Detailed Implementation

[0058] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0059] This invention provides, for example Figures 1 to 11 The self-closing valve with over-temperature protection structure shown includes a valve body 1, which has a left flow channel 101, a middle valve chamber 102, and a right flow channel 103 inside; it also includes a switching valve assembly 4, which is disposed in the left flow channel 101; the switching valve assembly 4 of the present invention adopts a ball valve structure and is operated manually. When operated manually, a handle is provided, and the valve core is rotated to realize the opening and closing of the left flow channel 101. Specifically, the inner side wall of the right flow channel 103 is provided with a sealing protrusion 1031 that cooperates with the high and low pressure self-closing assembly 2.

[0060] The high and low pressure self-closing component 2 is located at the bottom of the middle valve chamber 102 and can block the right flow channel 103. An elastic element 10 is provided between it and the bottom of the middle valve chamber 102. By setting the high and low pressure self-closing component 2, the present invention can block the right flow channel 103 when the fluid pressure in the self-closing valve is lower or higher than the normal range.

[0061] The valve cover 3 has a groove 31 on its top, and its sealing is located on the top of the valve body 1. A diaphragm 6 is provided between the valve cover 3 and the valve body 1. Specifically, the valve body 1 and the valve cover 3 are connected by a sealing snap-fit ​​9, thereby achieving a sealed connection between the valve body 1 and the valve cover 3.

[0062] The pull-up indicator component 8 has its bottom penetrating and connected to the diaphragm 6, and its top sliding through the valve cover 3. It can close the high and low pressure self-closing component 2 and indicate the low pressure self-closing, high pressure self-closing, normal operation, and over-temperature self-closing states. It can also cooperate with the switch valve component 4 to detect the sealing performance of the self-closing valve itself. The pull-up indicator component 8 of this invention can control the opening and closing of the high and low pressure self-closing component 2, and can also indicate the normal, low pressure self-closing, high pressure self-closing, and over-temperature self-closing working states of the self-closing valve in real time, making it convenient for operators to judge the operating status.

[0063] The over-temperature protection component 7 is installed inside the valve cover 3. When the temperature exceeds the preset value, the over-temperature protection component 7 is activated and pushes the lifting indicator component 8 to move, so that the high and low pressure self-closing component 2 is self-closing and the lifting indicator component 8 performs over-temperature self-closing indication.

[0064] Specifically, the over-temperature protection component 7 includes an elastic compression member 71, which is sleeved on the outside of the lifting indicator component 8 and placed at the bottom of the valve cover 3. By setting the elastic compression member 71, the present invention can push the diaphragm pressing component 5 to move downward. The downward movement of the diaphragm pressing component 5 can drive the lifting indicator component 8 to move, thereby realizing self-closing and indicating.

[0065] The pressure plate 72 is sleeved outside the lifting indicator assembly 8 and connected to the bottom of the elastic compression member 71. By setting the pressure plate 72, the present invention facilitates the even release of the elastic force generated by the elastic compression member 71, and enables even compression when compressing the elastic compression member 71.

[0066] The limiting member 73 is lower than the pressure plate 72. One end of it is located outside the valve cover 3, and the other end extends into the valve cover 3 and limits the pressure plate 72. Specifically, the end extending into the valve cover 3 is wedge-shaped. By setting the limiting member 73, the present invention limits the pressure plate 72, thereby keeping the elastic compression member 71 in a compressed state and storing energy.

[0067] The elastic thermal element 74 deforms when its temperature reaches a preset value. It is placed in the receiving groove 32 opened on the side wall of the valve cover 3 and is connected to the limiting member 73 for limiting. Specifically, the elastic thermal element 74 is a bimetallic strip. When the temperature exceeds the preset temperature, the elastic thermal element 74 deforms and drives the limiting member 73 to slide outward. The limiting member 73 slides outward and releases the limiting of the pressure plate 72. Under the elastic force of the elastic compression member 71, the pressure plate 72 is pushed downward and the lifting indicator assembly 8 is pushed downward, thereby realizing self-closing and indicating.

[0068] A protective cover 75 is sealed to the inner wall of the receiving groove 32. This invention achieves protection for the over-temperature protection component 7 by providing the protective cover 75.

[0069] Specifically, the lifting indicator assembly 8 includes an outer indicator hollow rod 81, the top of which is sealed and movable through the valve cover 3, and the bottom of which is through the diaphragm 6. The bottom of the rod is connected to the diaphragm 6 through the diaphragm pressing assembly 5.

[0070] The elastic annular support 82 is threadedly connected to the bottom outer wall of the diaphragm pressing assembly 5. Specifically, the elastic annular support 82 includes an upper annular support portion 821, and its bottom is connected to a lower annular support portion 823 via an elastic portion 822. Furthermore, the elastic force of the elastic compression member 71 is greater than the elastic force of the elastic portion 822, and the elastic force of the elastic member 10 is greater than the elastic force of the elastic compression member 71. By providing the elastic annular support 82, the present invention enables the elastic annular support 82 to undergo elastic deformation during the over-temperature self-closing process, thereby assisting the lifting indicator assembly 8 in indicating the over-temperature self-closing state.

[0071] The first indicator 83 is sleeved on the outer wall of the top end of the outer indicator hollow rod 81.

[0072] The armature 84 is placed inside the elastic ring support 82.

[0073] The permanent magnet 85 is located on top of the high and low voltage self-closing assembly 2.

[0074] Furthermore, the lifting indicator assembly 8 also includes an inner indicator rod 86, which is sealed and movably sleeved within the outer hollow indicator rod 81, with its top end lower than the outer hollow indicator rod 81 and its bottom end able to abut against the high and low pressure self-closing assembly 2. By setting the inner indicator rod 86, when the outer hollow indicator rod 81 slides downward, it can drive the inner indicator rod 86 to slide downward. The outer hollow indicator rod 81 and the inner indicator rod 86 slide downward, pushing the high and low pressure self-closing assembly 2 downward. When the high and low pressure self-closing assembly 2 moves to its lowest point... Then, the high and low pressure self-closing assembly 2 blocks the right flow channel 103, thereby achieving over-temperature self-closing; then, under the elastic force of the elastic compression member 71, after overcoming the elastic force of the elastic part 822, it pushes the outer indicator hollow rod 81 and the inner indicator rod 86 to continue to slide down. Since the inner indicator rod 86 has already come into contact with the high and low pressure self-closing assembly 2, under the reaction force, it overcomes the elastic force of the elastic indicator member 88 and slides upward relative to the outer indicator hollow rod 81, thereby compressing the outer indicator hollow rod 81, and thus achieving over-temperature self-closing indication.

[0075] A transparent sealing element 87 is threadedly fixed to the outer wall of the top end of the outer indicator hollow rod 81.

[0076] An elastic indicator 88 is placed between the transparent sealing member 87 and the inner indicator rod 86, and the portion below the outer hollow indicator rod 81 is coated with indicator paint. By setting the elastic indicator 88, when the elastic indicator 88 is compressed, the portion below the outer hollow indicator rod 81, i.e., the portion coated with indicator paint, enters the transparent sealing member 87, so that the portion coated with indicator paint can be observed. This state is the over-temperature self-closing indication state, thereby realizing the over-temperature self-closing indication.

[0077] The adjusting component 89 is rotatably connected at its bottom to the top of the inner indicator rod 86, with its middle portion passing through the transparent sealing component 87 and threadedly connected to it. Specifically, the bottom peripheral wall of the adjusting component 89 has a limiting protrusion, and the top of the inner indicator rod 86 has a sliding groove that slides in cooperation with the limiting protrusion. The top side wall of the sliding groove has a limiting snap ring. When the self-closing valve is in normal working condition, the high and low pressure self-closing assembly 2 is in the open state. By controlling the adjusting component 89 to rotate downwards, the inner indicator rod 86 is pulled downwards and slides downwards, pushing the high and low pressure self-closing assembly 2 to close. Then, the switching valve assembly 4 is controlled to close. After a period of time, the position of the first indicator 83 is observed. If the first indicator 83 is in the low pressure self-closing indication state, it indicates that there is an air leakage in the self-closing valve, thus enabling the self-closing valve to perform a sealing self-test.

[0078] Furthermore, a movable gap is left between the first indicator 83 and the valve cover 3, and an annular elastic layer 810 is provided at the bottom of the first indicator 83. By setting this movable gap, the present invention allows the outer indicator hollow rod 81 to slide downwards even after it has slid to the closed state of the high and low pressure self-closing assembly 2. The first indicator 83 of the present invention has four positions: the initial position, i.e., the position with a movable gap between it and the valve cover 3, which is also the low-pressure self-closing indicator position; the normal operation indicator position, which is higher than the initial position; the high-pressure self-closing indicator position, which is higher than the normal operation indicator position; and the over-temperature self-closing position, which is in contact with the top of the valve cover 3 without a movable gap. Since the first indicator 83 already has multiple height indication states, this over-temperature self-closing position is not used to determine that the self-closing valve is in an over-temperature self-closing state, to avoid misidentification by personnel.

[0079] Specifically, the diaphragm pressing assembly 5 includes a retaining ring 51, which is threadedly connected to the middle of the outer indicator hollow rod 81 and located at the bottom of the diaphragm 6.

[0080] The extrusion member 52 is sleeved in the middle of the outer indicator hollow rod 81 and located on top of the diaphragm 6.

[0081] The nut 53, with its threads fitted onto the middle of the outer hollow indicator rod 81 and located at the top of the extruder 52, abuts against the extruder 52. Through the cooperation of the retaining ring 51, the extruder 52, and the nut 53, tightening the nut 53 presses the diaphragm 6 between the retaining ring 51 and the extruder 52, thereby completing the sealed connection between the diaphragm 6 and the outer hollow indicator rod 81.

[0082] Specifically, the high and low pressure self-closing assembly 2 includes a high and low pressure elastic sealing plug 21, which is placed in the right flow channel 103 and can block the right flow channel 103. A sliding rod 22 is provided on its left side.

[0083] The boss 23 is located at the bottom of the central valve chamber 102 directly below the lifting indicator assembly 8, and its top is slidably connected to the slide bar 22. A pressure member 24 that restricts the slide bar 22 from sliding up and down is detachably connected to its top.

[0084] The clearance groove 25 is located on the slide bar 22 directly below the lifting indicator assembly 8.

[0085] The sliding member 26 is disposed in the clearance groove 25 and is slidably connected to the clearance groove 25. The bottom of the sliding member 26 is provided with a guide part 27 that is slidably connected to the sliding member 26 and fixedly connected to the middle valve cavity 102. The middle part is provided with an inclined groove 28, and the top of the inclined groove 28 is provided with a receiving groove 29 for accommodating the permanent magnet 85. The top of the inclined groove 28 is provided with a straight groove, and the inclined groove 28 is provided with a mating rod 210 that is fixedly connected to the side wall of the clearance groove 25.

[0086] The present invention sets up a high and low pressure self-closing component 2. When the external indicator hollow rod 81 slides down, it pushes the armature 84 to slide down. The armature 84 slides down and pushes the permanent magnet 85 to slide down. The permanent magnet 85 slides down and pushes the sliding member 26 to slide down. The sliding member 26 slides down. Under the wedge-shaped cooperation of the inclined groove 28 and the cooperating rod 210, the sliding rod 22 slides to the left and blocks the right flow channel 103.

[0087] The initial state of this invention is a low-pressure self-closing state. It should be noted that in the low-pressure self-closing state, the high and low pressure self-closing components 2 are in a closed state, that is, there is a gap between them and the valve cover 3, which is also the low-pressure self-closing indication position.

[0088] After the gas pipeline is connected, the switch valve assembly 4 is opened first to allow gas to enter the left flow channel 101. Under the action of gas pressure, the diaphragm 6 bulges slightly upward, the first indicator 83 slides upward and drives the outer indicator hollow rod 81 to slide upward. The outer indicator hollow rod 81 slides upward and drives the inner indicator rod 86 and armature 84 to slide upward. The armature 84 slides upward and, under the action of magnetic attraction, drives the permanent magnet 85 to slide upward. The permanent magnet 85 slides upward and drives the sliding member 26 to slide upward. The sliding member 26 slides upward and, under the wedge-shaped cooperation of the inclined groove 28 and the matching rod 210, causes the sliding rod 22 to slide to the right, so that the high and low pressure elastic sealing plug 21 releases the blockage of the right flow channel 103. Thus, the gas in the left flow channel 101 enters the middle valve chamber 102 and the right flow channel 103. At this time, the self-closing valve is in normal working condition.

[0089] During use, when the air pressure inside the pipeline is lower than the normal air pressure, due to the low air pressure in the middle valve chamber 102, the diaphragm 6 returns from a slight bulge to its initial state under the action of air pressure, causing the outer indicator hollow rod 81 and the first indicator 83 to move downward. When the outer indicator hollow rod 81 slides downward, it pushes the armature 84 to slide downward. The armature 84 slides downward and pushes the permanent magnet 85 to slide downward. The permanent magnet 85 slides downward and pushes the sliding member 26 to slide downward. The sliding member 26 slides downward, and under the wedge-shaped cooperation of the inclined groove 28 and the matching rod 210, the sliding rod 22 slides to the left and blocks the right flow channel 103, thereby changing the high and low pressure self-closing assembly 2 from the open state to the closed state. At the same time, the first indicator 83 moves downward from the normal working state to the initial state, that is, the low pressure self-closing indication state; thus, the low pressure self-closing and low pressure self-closing indication can be completed.

[0090] During use, when the air pressure inside the pipeline is higher than the normal air pressure, due to the high air pressure in the middle valve chamber 102, the diaphragm 6 bulges upward under the action of air pressure. The bulging of the diaphragm 6 pulls the outer hollow indicator rod 81 upward through the diaphragm pressing assembly 5. The upward movement of the outer hollow indicator rod 81 drives the first indicator 83, the inner indicator rod 86, and the armature 84 to move upward. The armature 84 moves away from the permanent magnet 85, making it insufficient for the permanent magnet 85 to continue to be attracted to the bottom of the armature 84. Under the action of gravity, the permanent magnet 85 and the sliding member 26 slide downward. The sliding member 26 slides downward, and under the wedge-shaped cooperation of the inclined groove 28 and the matching rod 210, the sliding rod 22 slides to the left and blocks the right flow channel 103. This causes the high and low pressure self-closing assembly 2 to change from the open state to the closed state. At the same time, the first indicator 83 moves downward from the normal working state to the high pressure self-closing high pressure indication state, thereby realizing high pressure self-closing and high pressure self-closing indication.

[0091] During use, when the temperature exceeds the preset value, the elastic thermal element 74 deforms, causing the limiting member 73 to slide outward. The limiting member 73 then releases the limiting position on the pressure plate 72. Under the elastic force of the elastic compression member 71, the pressure plate 72 moves downward, causing the outer hollow indicator rod 81 to move downward. The outer hollow indicator rod 81 slides downward, causing the inner indicator rod 86 to slide downward. The outer hollow indicator rod 81 slides downward, pushing the armature 84 downward. The armature 84 slides downward, pushing the permanent magnet 85 downward. The permanent magnet 85 slides downward, pushing the sliding member 26 downward. The sliding member 26 slides down to the bottom, and under the wedge-shaped engagement of the inclined groove 28 and the mating rod 210, the sliding rod 22 slides to the left, blocking the right flow channel 103, thereby achieving over-temperature control. Self-closing; after the sliding member 26 moves to the bottom, under the elastic force of the elastic compression member 71, it overcomes the elastic force of the elastic part 822 and pushes the outer indicator hollow rod 81 and the inner indicator rod 86 to continue to slide down. Since the inner indicator rod 86 has already come into contact with the high and low pressure self-closing component 2, under the reaction force, it overcomes the elastic force of the elastic indicator 88 and slides upward relative to the outer indicator hollow rod 81, thereby compressing the elastic indicator 88 into the transparent sealing member 87. At this time, the elastic indicator 88 that is lower than the outer indicator hollow rod 81, that is, the elastic indicator 88 with the indicator paint sprayed on, enters into the transparent sealing member 87, so that the part of the elastic indicator 88 with the indicator paint sprayed on can be observed. This state is the over-temperature self-closing state, thereby realizing the over-temperature self-closing indication, and thus reminding the subsequent operators to shut down when the high temperature occurs, to conduct hidden danger investigation, and to avoid the occurrence of safety accidents.

[0092] When the sealing performance of the self-closing valve needs to be tested, first open the switching valve assembly 4 to allow gas to enter the left flow channel 101. Under the action of gas pressure, the diaphragm 6 bulges slightly upward, putting the self-closing valve into normal working condition. Then, hold the first indicator 83 firmly with one hand, keeping it in this position. Then, with the other hand, rotate the adjusting member 89 downward in a spiral. When the thread on the adjusting member 89 passes the thread on the transparent sealing member 87, the adjusting member 89 and the transparent sealing member 87 are slidably connected. By pressing the adjusting member 89, the adjusting member 89 moves downward and pushes the inner indicator rod 86 downward. After overcoming the magnetic attraction between the armature 84 and the permanent magnet 85, the inner indicator rod 86 pushes the permanent magnet 85 to slide downward. The permanent magnet 85 slides downward and pushes the sliding member 26 to slide downward. The sliding member 26 slides downward. When the sliding rod 22 slides to the left under the wedge-shaped engagement of the inclined groove 28 and the matching rod 210, it blocks the right flow channel 103, thereby changing the high and low pressure self-closing assembly 2 from the open state to the closed state. Then, the adjusting member 89 is pressed to push the sliding member 26 to continue sliding downward after overcoming the elastic force of the elastic member 10. The permanent magnet 85 and the sliding member 26 slide downward, so that the permanent magnet 85 and the armature 84 maintain a large gap to avoid mutual interference. The first indicator 83 is still in normal working condition under the action of air pressure. After a period of time, the position of the first indicator 83 is observed. If the self-closing valve itself has poor sealing and leakage, the air pressure in the middle valve chamber 102 and the diaphragm 6 will be in a low-pressure state. When it is in a low-pressure state, the outer indicator hollow rod 81 moves down to the low-pressure self-closing indicator state. After a period of time, by observing the position of the first indicator 83, if the first indicator 83 is in a low-pressure self-closing state, it indicates that the self-closing valve itself has an air leakage phenomenon; if the first indicator 83 is in a normal working state, it indicates that the self-closing valve itself has good sealing performance, thus enabling the self-closing valve to perform sealing performance testing.

[0093] Finally, it should be noted that the above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A self-closing valve with an over-temperature protection structure, comprising a valve body having a left flow channel, a middle valve chamber, and a right flow channel internally, characterized in that, It also includes a switching valve assembly, which is disposed in the left flow channel; The high and low pressure self-closing assembly is located at the bottom of the middle valve chamber and can block the right flow channel. An elastic element is provided between it and the bottom of the middle valve chamber. The valve cover has a groove on its top, and its sealing device is located on the top of the valve body, with a diaphragm between it and the valve body. The lifting indicator assembly has its bottom penetrating and connected to the diaphragm, and its top sliding through the valve cover. It can close the high and low pressure self-closing assembly and indicate the low pressure self-closing, high pressure self-closing, normal operation and over-temperature self-closing status. It can also cooperate with the switching valve assembly to detect the sealing performance of the self-closing valve itself. An over-temperature protection component is installed inside the valve cover. When the temperature exceeds a preset value, the over-temperature protection component is activated and pushes the lifting indicator component to move, causing the high and low pressure self-closing component to close automatically and the lifting indicator component to indicate over-temperature self-closing. The over-temperature protection component includes: an elastic compression member, which is sleeved outside the lifting indicator component and placed at the bottom of the valve cover; A pressure plate, which is sleeved on the outside of the lifting indicator assembly and connected to the bottom of the elastic compression member; The limiting component is lower than the pressure plate, with one end located outside the valve cover and the other end extending into the valve cover to limit the pressure plate. The elastic thermal element can deform when the temperature reaches the preset value. It is placed in the storage groove opened in the side wall of the valve cover and is connected to the limiting component for limiting. The protective cover is sealed to the inner wall of the storage compartment. The lifting indicator assembly includes: an outer hollow indicator rod, the top of which is sealed and movable through the valve cover, the bottom of which penetrates the diaphragm, and the bottom of which is connected to the diaphragm through a diaphragm pressing assembly; An elastic annular support is threaded to the bottom outer wall of the diaphragm clamping assembly; The first indicator is sleeved on the outer wall of the top end of the outer hollow indicator rod; The armature is placed inside an elastic ring-shaped support; Permanent magnets are mounted on top of the high and low voltage self-closing components; The lifting indicator assembly further includes: an inner indicator rod, which is sealed and movably sleeved inside the outer hollow indicator rod, with its top end lower than the outer hollow indicator rod and its bottom end able to abut against the high and low pressure self-closing assembly; A transparent sealing component, which is threadedly fixed to the outer wall of the top of the outer indicator hollow rod; The flexible indicator is placed between the transparent sealing part and the inner indicator rod, and the part below the outer hollow indicator rod is sprayed with indicator paint. The adjusting component has its bottom rotatably connected to the top of the inner indicator rod, and its middle part passes through the transparent sealing component and is threadedly connected to the transparent sealing component.

2. The self-closing valve with over-temperature protection structure according to claim 1, characterized in that, The elastic annular support includes an upper annular support portion, and its bottom is connected to a lower annular support portion via an elastic portion.

3. The self-closing valve with over-temperature protection structure according to claim 1, characterized in that, There is a movable gap between the first indicator and the valve cover, and an annular elastic layer is provided at the bottom of the first indicator.

4. The self-closing valve with over-temperature protection structure according to claim 1, characterized in that, The elastic force of the elastic compression member is greater than the elastic force of the elastic part, and the elastic force of the elastic member is greater than the elastic force of the elastic compression member.

5. The self-closing valve with over-temperature protection structure according to claim 1, characterized in that, The diaphragm pressing assembly includes: a retaining ring, which is threadedly connected to the middle of the outer indicator hollow rod and located at the bottom of the diaphragm; The extrusion component is sleeved in the middle of the outer indicator hollow rod and located on top of the diaphragm; The nut, with its threads fitted into the middle of the outer hollow indicator rod and located at the top of the extrusion part, abuts against the extrusion part.

6. The self-closing valve with over-temperature protection structure according to claim 1, characterized in that, The inner wall of the right flow channel is provided with a sealing protrusion that cooperates with the high and low pressure self-closing assembly.

7. The self-closing valve with over-temperature protection structure according to claim 1, characterized in that, The high and low pressure self-closing assembly includes: a high and low pressure elastic sealing plug, which is placed in the right flow channel and can block the right flow channel, and a sliding rod is provided on its left side; The boss is located at the bottom of the central valve chamber directly below the lifting indicator assembly, and its top is slidably connected to the slide bar. A pressure piece that restricts the slide bar from sliding up and down is detachably connected to its top. A clearance groove is provided on the slide bar directly below the lift indicator assembly; A sliding member is disposed in the clearance groove and is slidably connected to the clearance groove. The bottom of the sliding member is provided with a guide part that is slidably connected to the sliding member and fixedly connected to the middle valve cavity. An inclined groove is provided in the middle part, and a receiving groove for accommodating a permanent magnet is provided at the top of the inclined groove. A straight groove is provided at the top of the inclined groove, and a mating rod that is fixedly connected to the side wall of the clearance groove is provided in the inclined groove.

Images