Simple self-closing valve structure

Abstract

The utility model relates to a simple self-closing valve structure. The valve mainly comprises a valve body, a push rod and a control rod, the valve body and the push rod are connected in a horizontal guide fit mode, it is ensured that the opening and closing function of a valve clack on the sealing end face of the valve body is achieved through horizontal movement, and vertical movement of the control rod is converted into horizontal movement of the push rod through cooperation of a cylindrical boss of the control rod and a double-face inclined groove of the push rod; the stability and the safety of the self-closing valve are structurally improved in a manner of interference fit and pre-tightening of a three-petal clamping jaw of the diaphragm buckle and a groove of the diaphragm connecting rod; compared with the prior art, the utility model has the advantages that the number of parts is small, the assembly is simple, the manufacturing cost is reduced, and the failure risk is also reduced.

Description

Technical Field

[0001] This utility model belongs to the technical field of gas safety valves, specifically relating to a simple self-closing valve structure. Background Technology

[0002] As natural gas enters every household, gas safety is a constant concern. Self-closing valves, which do not require electricity or other external power or energy, and which automatically close when the gas supply pressure is too high, too low, or too high, but must be manually opened, are widely used in household gas appliances to ensure safe gas use.

[0003] With the continuous updating and optimization of self-closing valve technology, the performance of most self-closing valves has become relatively perfect. For example, Chinese utility model patent CN 221958226 U discloses a self-closing valve structure, which is ingeniously designed and relatively mature. However, from the perspective of entering thousands of households, self-closing valves also have the advantages of stable product performance and cost. In short, they are good quality and inexpensive. Obviously, the self-closing valve structure disclosed above is obviously complex, with too many parts, resulting in too many uncertain variables (too many potential failure modes and more potential risks). The cost of parts and labor is too high, which is not conducive to widespread promotion. Utility Model Content

[0004] In view of the problems existing in the prior art, the purpose of this utility model is to provide a technical solution for a simple self-closing valve structure.

[0005] The aforementioned simple self-closing valve structure is characterized by having a front guide hole, a suction plate mounting groove, a control rod guide groove, and a rear guide hole within the valve body. The front and rear guide holes are used for positioning the push rod and guiding its forward and backward movement. A sealing end face at the front end of the front guide hole cooperates with the valve disc to perform opening and closing movements, controlling the air intake and shut-off of the self-closing valve. The control rod guide groove is used for positioning the control rod and guiding its up and down movement. The suction plate mounting groove is used for positioning and installing the suction plate. A diaphragm mounting groove is also provided on the top of the valve body for installing and pressing the diaphragm edge for sealing.

[0006] A push rod is horizontally arranged inside the valve body. The push rod consists of a valve disc mounting boss, a middle cross guide post, a double-sided inclined groove, and a rear cross guide post. The valve disc mounting boss is located at the front end of the push rod for mounting the valve disc. The middle cross guide post guides the valve body to the front guide hole. The double-sided inclined groove matches the cylindrical boss of the control rod, converting the vertical movement of the control rod into the horizontal movement of the push rod. The rear cross guide post guides the valve body to the rear guide hole.

[0007] A control rod is vertically mounted inside the valve body. The control rod consists of a square guide boss, a limiting surface, a cylindrical boss, and a lower guide strip. The lower guide strip at the bottom of the control rod engages with the control rod guide groove in the valve body, guiding the vertical movement of the control rod. Cylindrical bosses are located on both sides of the middle section of the control rod, matching the double-sided oblique grooves of the push rod, converting the vertical movement of the control rod into the horizontal movement of the push rod. The upper section of the control rod has a square guide boss and a limiting surface. The square guide boss passes through the guide hole of the suction plate and limits the height of the control rod. A permanent magnet mounting hole is located at the top of the square guide boss for connection and fixation with the permanent magnet using screws. A suction plate is fitted over the square guide boss, and the suction plate mounting hole is fixed to the suction plate mounting groove in the valve body using screws. The suction plate magnetically engages with the permanent magnet.

[0008] A diaphragm connecting rod is provided above the permanent magnet, and the diaphragm connecting rod is magnetically attracted to the permanent magnet; the diaphragm connecting rod is provided with an upper groove and a lower groove, a diaphragm is provided at the lower part of the diaphragm connecting rod, a diaphragm pressure plate is provided above the diaphragm, a diaphragm buckle is provided above the diaphragm pressure plate, and the diaphragm buckle is engaged with the lower groove to limit the diaphragm pressure plate; a top cover is provided at the upper part of the diaphragm connecting rod, a lifting button is provided above the top cover, and a lifting button cap is provided above the lifting button, which is engaged with the upper groove.

[0009] The simple self-closing valve structure is characterized in that the top of the diaphragm buckle is provided with a three-lobed claw, which rebounds and interferes with the groove at the lower end of the diaphragm connecting rod, and presses the diaphragm pressure plate with a pre-tightening force, so that the diaphragm is firmly pressed between the diaphragm pressure plate and the diaphragm connecting rod.

[0010] The aforementioned simple self-closing valve structure is characterized in that the upper cover and the valve body are sealed by a sealing ring.

[0011] The aforementioned simple self-closing valve structure is characterized by an overcurrent protection device installed at the air inlet end of the valve body and a ball valve installed at the air outlet end of the valve body.

[0012] The aforementioned simple self-closing valve structure is characterized in that the air inlet of the valve body is provided with an air inlet thread for connection with a pipe thread.

[0013] The aforementioned simple self-closing valve structure is characterized in that the air inlet of the valve body is provided with a two-stage thread for threaded connection with an overcurrent protection device.

[0014] The aforementioned simple self-closing valve structure is characterized by a label being provided above the lifting cap.

[0015] The beneficial effects of this utility model are:

[0016] Compared with existing technologies, this utility model has fewer parts and is simpler to assemble, thereby reducing manufacturing costs and the risk of failure.

[0017] The design of the front and rear guide holes of the valve body provides better guidance for the push rod, effectively improving the stability of the valve disc opening and closing. The matching design of the double-sided cylindrical boss of the control rod and the double-sided oblique groove of the push rod makes the conversion of the vertical movement of the control rod into the horizontal movement of the push rod simpler and more stable. The vertical guidance of the suction plate, control rod and valve body further improves the stability of vertical movement, thereby improving the overall safety and stability of the self-closing valve.

[0018] Compared to other designs that use a nut-like mechanism to tighten the diaphragm plate, the diaphragm snap-fit ​​design is more effective in preventing the self-closing valve from loosening during transportation and use. This improves the sealing between the diaphragm and the diaphragm connecting rod, enhancing the stability and safety of the self-closing valve. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0020] Figure 2 This is an exploded view of the present invention;

[0021] Figure 3 This is a cross-sectional view of the present invention;

[0022] Figure 4 This is a schematic diagram of the valve body of this utility model;

[0023] Figure 5 This is a schematic diagram of the control lever of this utility model;

[0024] Figure 6 This is a schematic diagram of the push rod of this utility model;

[0025] Figure 7 This is a schematic diagram of the diaphragm clip of this utility model;

[0026] Figure 8 This is a schematic diagram of the suction plate of this utility model;

[0027] The components are: 1-valve body, 101-inlet thread, 102-secondary thread, 103-sealing end face, 104-valve seat groove, 105-ball mounting cavity, 106-outlet thread, 107-front guide hole, 108-pull plate mounting groove, 109-control rod guide groove, 110-rear guide hole, 111-diaphragm mounting groove, 112-valve stem mounting hole, 113-ball valve handle limiting boss, 2-sealing ring, 3-diaphragm, 4-top cover, 5-lifting knob, 6-lifting knob cap, 7-label, 8-diaphragm clip, 801-three-lobed claw, 9-diaphragm pressure plate, 10-permanent magnet, 11-pull plate, 1101-pull plate mounting hole, 1102-control rod. 12-Guide hole, 13-Protective cover, 14-Ball valve handle, 15-Valve stem, 16-O-ring seal, 17-Ball valve seat, 18-Ball valve connector, 1801-Connector seat groove, 19-Diaphragm connecting rod, 1901-Upper groove, 1902-Lower groove, 20-Control rod, 2001-Permanent magnet mounting hole, 2002-Square guide boss, 2003-Limiting surface, 2004-Cylindrical boss, 2005-Lower guide bar, 21-Push rod, 2101-Valve disc mounting boss, 2102-Middle section cross guide post, 2103-Double-sided oblique groove, 2104-Rear section cross guide post, 22-Valve disc, 23-Overcurrent protection device. Detailed Implementation

[0028] The present invention will be further described below with reference to the accompanying drawings:

[0029] A simple self-closing valve structure includes a valve body 1 with a front guide hole 107, a suction plate mounting groove 108, a control rod guide groove 109, and a rear guide hole 110. The front guide hole 107 and the rear guide hole 110 are used for positioning and guiding the push rod 21. The sealing end face 103 at the front end of the front guide hole 107 cooperates with the valve disc 22 to open and close, controlling the air intake and shut-off of the self-closing valve. The control rod guide groove 109 is used for positioning and guiding the vertical movement of the control rod 20. The suction plate mounting groove 108 is used for positioning and installing the suction plate 11. The top of the valve body also has a diaphragm mounting groove 111 for installing and pressing the diaphragm edge for sealing. An overcurrent protection device is provided at the air inlet end of the valve body, and a ball valve is provided at the air outlet end of the valve body. The air inlet of the valve body has an air inlet thread 101 for threaded connection with a pipe. The air inlet of the valve body has a secondary thread 102 for threaded connection with the overcurrent protection device.

[0030] A push rod 21 is horizontally arranged inside the valve body. The push rod 21 consists of a valve disc mounting boss 2101, a middle section cross guide post 2102, a double-sided inclined groove 2103, and a rear section cross guide post 2104. The valve disc mounting boss 2101 is set at the front end of the push rod 21 for mounting the valve disc 22. The middle section cross guide post 2102 is used to guide the valve body to the front guide hole. The double-sided inclined groove 2103 is used to match the cylindrical boss 2004 of the control rod, so as to convert the vertical movement of the control rod 20 into the horizontal movement of the push rod 21. The rear section cross guide post 2104 is used to cooperate with the rear guide hole 110 of the valve body 1 for guidance.

[0031] A control rod 20 is vertically installed inside the valve body. The control rod 20 consists of a square guide boss 2002, a limiting surface 2003, a cylindrical boss 2004, and a lower guide strip 2005. The lower guide strip 2005 at the lower end of the control rod cooperates with the control rod guide groove 109 of the valve body to guide the vertical movement of the control rod 20. Cylindrical bosses 2004 are provided on both sides of the middle section of the control rod to match the double-sided inclined groove 2103 of the push rod, so as to convert the vertical movement of the control rod into the horizontal movement of the push rod. The upper section of the control rod is provided with a square guide boss 2002 and a limiting surface 2003. The square guide boss is used to pass through the guide hole 1102 of the suction plate and limit the height of the control rod. The top of the square guide boss is provided with a permanent magnet mounting hole 2001 for connecting and fixing with the permanent magnet 10 by screws. The square guide boss is fitted with a suction plate 11. The suction plate mounting hole 1101 of the suction plate 11 is fixed in the suction plate mounting groove of the valve body by screws. The suction plate 11 and the permanent magnet are magnetically attracted to each other.

[0032] A diaphragm connecting rod 19 is provided above the permanent magnet 10, and the diaphragm connecting rod 19 is magnetically attracted to the permanent magnet 10. The diaphragm connecting rod 19 is provided with an upper groove 1901 and a lower groove 1902. A diaphragm 3 is provided at the lower part of the diaphragm connecting rod 19. A diaphragm pressure plate 9 is provided above the diaphragm pressure plate 9. A diaphragm buckle 8 is provided above the diaphragm pressure plate 9. The diaphragm buckle 8 is engaged with the lower groove 1902 to limit the diaphragm pressure plate. An upper cover 4 is provided at the upper part of the diaphragm connecting rod 19. A lifting button 5 is provided above the upper cover 4. A lifting button cap 6 is provided above the lifting button 5. The lifting button cap 6 is engaged in the upper groove 1901. A label 7 is provided above the lifting button cap. The upper cover and the valve body are sealed by a sealing ring 2.

[0033] The diaphragm clip 8 has a three-lobed claw 801 at the top. The three-lobed claw rebounds and is interference-fitted into the groove at the lower end of the diaphragm connecting rod, and presses the diaphragm pressure plate with a pre-tightening force, so that the diaphragm is firmly pressed between the diaphragm pressure plate and the diaphragm connecting rod.

[0034] The upper part of the ball mounting cavity of the ball valve is designed with a valve stem mounting hole. After the O-ring is fitted onto the valve stem groove, the boss is installed in the valve stem mounting hole after it mates with the ball groove. There is also a limit boss, which is used to rotate the ball valve handle to the correct position, thereby driving the valve stem to control the opening and closing of the ball while sealing.

[0035] The valve body and push rod of this utility model are horizontally guided and connected to ensure that the valve disc can open and close at the sealing end face of the valve body through horizontal movement. The vertical movement of the control rod is converted into the horizontal movement of the push rod through the cooperation of the cylindrical boss of the control rod and the double-sided oblique groove of the push rod. Furthermore, the stability and safety of the self-closing valve are improved by the interference fit and pre-tightening of the three-lobed claw of the diaphragm buckle and the groove of the diaphragm connecting rod.

[0036] This utility model is simple to assemble, as detailed below:

[0037] First, install and fix the valve disc 22 on the valve disc mounting boss 2101 on the push rod 21. Then, push the push rod 21 into the front guide hole 107 of the valve body air inlet, so that the end face of the valve disc 22 presses on the sealing end face 103 of the valve body air inlet. The rear cross guide post 2104 cooperates with the rear guide hole 110, and the middle cross guide post 2102 cooperates with the front guide hole 107.

[0038] Furthermore, the lower guide bar 2005 of the control lever 20 is passed through the push rod 21, so that the cylindrical bosses 2004 on both sides match the double-sided inclined grooves 2103 of the push rod 21, and slowly slides into the bottom, so that the lower guide bar 2005 of the control lever 20 matches the control lever guide groove 109 of the valve body 1.

[0039] Furthermore, the control rod guide hole 1102 of the suction plate 11 passes through the square guide boss 2002 of the control rod 20 and through the two suction plate mounting holes 1101, and the suction plate 11 is installed and fixed in the suction plate mounting groove 108 on the valve body 1 with screws.

[0040] Furthermore, the permanent magnet 10 is mounted and fixed on the control rod 20 through the permanent magnet mounting hole 2001 using countersunk screws. At this time, there is a clearance fit between the permanent magnet 10 and the suction plate 11.

[0041] Furthermore, the overcurrent protection device 23 is fixed to the air inlet end of the valve body 1 by threaded connection with the secondary thread 102;

[0042] Furthermore, a ball valve seat 17 is installed and fixed in the valve seat groove 104 on the valve body 1, and then the ball 16 is pushed from the air outlet into the ball mounting cavity 105 of the valve body 1, so that the spherical surface of the ball 16 is sealed with the ball valve seat 17.

[0043] Furthermore, another ball valve seat 17 is installed and fixed in the connector seat groove 1801 on the ball valve connector 18, and then the ball valve connector 18 is fixed together by threaded connection with the air outlet thread 106 of the valve body 1, so that the ball valve seat 17 and the ball 16 are in spherical sealing fit.

[0044] Furthermore, insert two O-rings 15 into the two O-ring grooves on the valve stem 14, then align the boss of the valve stem 14 with the groove on the ball 16 and insert it into the valve stem mounting hole 112 on the valve body 1, so that the O-rings 15 seal with the inner wall of the valve stem mounting hole 112. Then, align the ball valve handle 13 with the ball valve handle limiting boss 113 on the valve body 1 and fix the ball valve handle 13 to the valve stem 14 with screws, and then cover it with the protective cover 12.

[0045] Furthermore, the diaphragm connecting rod 19 is passed through the central hole of the diaphragm 3, then through the central hole of the diaphragm pressure plate 9, and then through the central hole of the diaphragm buckle 8. The diaphragm buckle 8 is then forcibly inserted into the lower end groove 1902 of the diaphragm connecting rod 19 by means of interference fit. At this time, the diaphragm pressure plate 9 and the diaphragm connecting rod 19 are pre-tightened to press the diaphragm 3. The interference fit makes the end face of the diaphragm 3 and the diaphragm connecting rod 19 sealed.

[0046] Furthermore, the edge of the diaphragm 3 is placed into the diaphragm mounting groove 111 of the valve body 1, and then the center hole of the upper cover 4 is passed through the diaphragm connecting rod 19 and the edge of the diaphragm 3 is pressed down. Then the sealing ring 2 is put on the upper cover 4 and pressed tightly to wrap the edge of the upper cover 4 and the valve body 1, so that the edge of the diaphragm 3 is used for sealing the valve body 1.

[0047] Furthermore, insert the lifting button 5 into the diaphragm connecting rod 19 and place it above the upper cover 4, aligning the centers. Then, forcefully insert the lifting button cap 6 into the upper groove 1901 of the diaphragm connecting rod 19 with the center buckle interference fit to prevent it from falling off. Finally, attach the label 7.

[0048] The installation of this utility model is now complete.

[0049] Working principle:

[0050] Open the ball valve at the outlet end (the ball valve structure is existing technology and is not protected by this utility model) until the ball 16 is in the open position. Pull up the lifting button 5 so that the diaphragm connecting rod 19 pulls the control rod 20 upward through the attraction between it and the permanent magnet 10 (the permanent magnet 10 is in contact with the diaphragm connecting rod 19 and is in clearance fit with the suction plate, so the attraction of the diaphragm connecting rod 19 is greater than that of the suction plate 11). The cylindrical boss 2004 on the control rod 20 moves upward and moves the push rod 21 to the left through the double-sided oblique groove 2103 of the push rod 21. The valve disc 22 and the sealing end face 103 open, and the gas enters the self-closing valve cavity. Due to the upward buoyancy of the gas pressure on the diaphragm 3, the control rod is in a relatively balanced state after the valve is opened, and it is in normal operation at this time.

[0051] Undervoltage protection: When the gas pressure is lower than the rated gas pressure, the upward buoyancy of the gas on the diaphragm 3 is less than the attraction of the suction plate 11 on the permanent magnet 10 and the combined force of the weight of the diaphragm connecting rod 19, the diaphragm 3 diaphragm pressure plate 9, the diaphragm buckle 8, the lifting cap 6, the control rod 20, and the permanent magnet 10. At this time, the control rod 20 moves downward, the push rod 21 moves to the right, the self-closing valve automatically closes for protection, and the undervoltage protection is completed.

[0052] Overpressure protection: When the gas pressure is higher than the rated gas pressure, the upward buoyancy of the gas on the diaphragm 3 is greater than the attraction between the permanent magnet 10 and the diaphragm connecting rod 19. At this time, the control rod 20 is blocked by the limiting surface 2003 of the control rod 20 by the suction plate 11 and cannot continue to move upward. The permanent magnet 10 is separated from the diaphragm connecting rod 19. Under the action of its own weight and the downward attraction of the suction plate 11 on the permanent magnet 10, the control rod 20 moves downward. At this time, the push rod 21 moves to the right, the self-closing valve automatically closes for protection, and the overpressure protection is completed.

[0053] Overcurrent protection: When the gas flow rate exceeds the rated flow rate, the overcurrent protection device automatically shuts off (overcurrent protection device 23 is a well-known mature product and is not the subject of this utility model application). The self-closing valve chamber is in an under-pressure state, and the self-closing valve automatically closes, thus achieving the purpose of safe gas use.

[0054] The working principle of this utility model has been explained in the above.

Claims

1. A compact self-closing valve structure, characterized by The valve body is internally provided with a front guide hole, a suction plate mounting groove, a control rod guide groove and a rear guide hole, the front guide hole and the rear guide hole are used for push rod positioning and front and rear movement guiding; a sealing end face arranged at the front end of the front guide hole cooperates with the valve clack to perform opening and closing movement, and is used for controlling air inlet and air closing of the self-closing valve; the control rod guide groove is used for control rod positioning and up and down movement guiding; the suction plate mounting groove is used for suction plate positioning and installation; the valve body top is further provided with a diaphragm mounting groove, which is used for diaphragm edge installation and compression sealing; A push rod is transversely arranged in the valve body, the push rod is composed of a valve clack mounting boss, a middle section cross guide column, a double-sided inclined groove and a rear section cross guide column, the push rod front end is provided with the valve clack mounting boss, which is used for mounting the valve clack; the middle section cross guide column is used for guiding the front guide hole of the valve body, the double-sided inclined groove is used for matching the cylindrical boss of the control rod, and the double-sided inclined groove is used for converting the up and down movement of the control rod into the horizontal movement of the push rod; the rear section cross guide column is used for guiding the rear guide hole of the valve body. A control rod is vertically arranged in the valve body, the control rod is composed of a square guide boss, a limiting surface, a cylindrical boss and a lower end guide square bar, the lower end guide square bar at the lower end of the control rod cooperates with the control rod guide groove of the valve body, and the lower end guide square bar is used for guiding the up and down movement of the control rod; the control rod middle section is provided with a cylindrical boss on both sides, which is used for matching the double-sided inclined groove of the push rod, and the cylindrical boss is used for converting the up and down movement of the control rod into the horizontal movement of the push rod; the control rod upper section is provided with the square guide boss and the limiting surface, the square guide boss is used for passing through the suction plate guide hole and limiting the lifting height of the control rod; the square guide boss top is provided with a permanent magnet mounting and fixing hole, which is used for being fixed with the permanent magnet through a screw; the square guide boss is sleeved with the suction plate, the suction plate mounting and fixing hole of the suction plate is fixed in the suction plate mounting groove of the valve body through a screw; the suction plate is magnetically attracted with the permanent magnet; A diaphragm connecting rod is arranged above the permanent magnet, the diaphragm connecting rod is magnetically attracted with the permanent magnet; the diaphragm connecting rod is provided with an upper end groove and a lower end groove, a diaphragm is arranged at the lower part of the diaphragm connecting rod, a diaphragm pressing plate is arranged above the diaphragm, a diaphragm buckle is arranged above the diaphragm pressing plate, the diaphragm buckle is clamped in the lower end groove to limit the diaphragm pressing plate; an upper cover is arranged at the upper part of the diaphragm connecting rod, a lifting knob is arranged above the upper cover, a lifting knob cap is arranged above the lifting knob, and the lifting knob cap is clamped in the upper end groove.

2. A compact self-closing valve structure according to claim 1, characterized in that The diaphragm buckle top is provided with three clamping jaws, the three clamping jaws are elastically fitted in the lower end groove of the diaphragm connecting rod, and the three clamping jaws are pre-tightened to press the diaphragm pressing plate, so that the diaphragm is tightly pressed between the diaphragm pressing plate and the diaphragm connecting rod.

3. A compact self-closing valve structure according to claim 1, characterized in that The upper cover is sealed with the valve body through a sealing ring.

4. A compact self-closing valve structure according to claim 1, characterized in that An overflow protection device is arranged at the air inlet end of the valve body, and a ball valve is arranged at the air outlet end of the valve body.

5. A compact self-closing valve structure according to claim 1, wherein The air inlet of the valve body is provided with an air inlet thread, which is used for threaded connection with a pipeline.

6. A compact self-closing valve structure according to claim 1, wherein The air inlet of the valve body is provided with a two-stage thread, which is used for threaded connection with the overflow protection device.

7. A compact self-closing valve structure according to claim 1, wherein A label is arranged above the lifting knob cap.

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