Overcurrent cut-off liquefied petroleum gas self-closing angle valve

Abstract

A main valve body of the overflow cut-off liquefied petroleum gas self-closing angle valve is provided with a main valve cavity, a lower valve port and a side valve port which are communicated with one another, a main valve element is arranged in the main valve cavity, and a hand wheel assembly linked with the main valve element is arranged at the top of the main valve body; a ventilation valve seat is arranged on the side portion of the main valve body and provided with a ventilation valve cavity and a ventilation opening which are communicated, the ventilation valve cavity is communicated with the main valve cavity through a side valve opening, a self-closing boss is arranged in the ventilation valve seat, and a main ventilation channel is arranged in the self-closing boss. A self-closing valve element is arranged in the main air duct, a flow guide cavity is formed in the self-closing valve element, a sealing boss is arranged on the inner wall of the self-closing valve element, and an auxiliary air duct is arranged in the sealing boss. A self-closing clamping table is arranged at the inner end of the self-closing valve element, a self-closing spring is arranged outside the self-closing valve element in a sleeving mode, and a self-closing piece is arranged at the outer end of the self-closing clamping table. A row limiting iron core is arranged in the flow guide cavity, a guide section of the row limiting iron core is inserted into the auxiliary air duct, an exhaust gap is formed between a gas blocking section of the row limiting iron core and the sealing boss, and the gas blocking section is provided with a gas blocking piece abutting against the sealing boss; the ventilation valve seat is provided with a magnetic induction driving assembly and a signal interaction module.

Description

TECHNICAL FIELD

[0001] The utility model relates to liquefied petroleum gas supporting valve equipment technical field, especially in a kind of overcurrent cut-off liquefied petroleum gas self-closing angle valve. BACKGROUND

[0002] As a kind of commonly used fuel, liquefied petroleum gas enters people's life rapidly with its convenience, fast and clean advantages, and brings a lot of convenience to people.

[0003] User in the use process, the existing liquefied petroleum gas valve is usually installed with self-closing device, however, such equipment assembly layout can solve the problem of liquefied petroleum gas leakage caused by hand wheel misoperation, but when equipment exists pipeline or pressure reducing valve drop during use and causes liquefied petroleum gas to leak in large quantities, or due to the installation of pressure reducing valve during installation due to operation error exists installation not in place and causes liquefied petroleum gas to leak, etc., then the leaked liquefied petroleum gas meets open fire, spark, etc. It is easy to explode, thereby causing personnel casualty and property loss.

[0004] Therefore, how to accurately and efficiently cut off gas circuit when liquefied petroleum gas leaks and causes excessive valve flow, avoid further leakage of liquefied petroleum gas, so as to improve the safety of bottled liquefied petroleum gas use is an important technical problem to be solved by the person skilled in the art at present. UTILITY MODEL CONTENT

[0005] The utility model aims at providing a kind of overcurrent cut-off liquefied petroleum gas self-closing angle valve, which can accurately and efficiently cut off gas circuit when liquefied petroleum gas leaks and causes excessive valve flow, avoid further leakage of liquefied petroleum gas, so as to improve the safety of bottled liquefied petroleum gas use.

[0006] To solve the above technical problems, the utility model provides a kind of overcurrent cut-off liquefied petroleum gas self-closing angle valve, including the main valve body with main valve cavity in the inside, the bottom of the main valve body has the lower valve port being communicated with the main valve cavity, the side of the main valve body has the side valve port being communicated with the main valve cavity, the main valve cavity is provided with main valve core in on-off, the top of the main valve body is rotatably provided with hand wheel assembly being linked with the main valve core;

[0007] The side of the main valve body is provided with air vent valve seat, the inside of the air vent valve seat has air vent valve cavity, the outer end of the air vent valve seat has air vent with the air vent valve cavity being communicated, the air vent valve cavity is communicated with the main valve cavity by the side valve port, the inner ring wall of the air vent valve seat is provided with self-closing boss along its radial direction, the self-closing boss extends along the circumference of the air vent valve seat and is connected head to tail, to form main air passage extending along the axial direction of the air vent valve seat on the inside of the self-closing boss;

[0008] The main air passage is provided with a self-closing valve core, the inside of the self-closing valve core has a flow guide cavity, a sealing boss is radially protruded on the inner ring wall of the self-closing valve core, the sealing boss extends along the circumference of the self-closing valve core and connects head to tail, so as to form a secondary air passage extending along the axial direction of the self-closing valve core on the inner side of the sealing boss;

[0009] The outer peripheral part of the inner end of the self-closing valve core is protruded with a self-closing clamping platform extending along the circumference and connecting head to tail, the outer peripheral part of the inner end of the self-closing valve core is sleeved with a self-closing spring, the outer end of the self-closing spring abuts against the axial inner end surface of the self-closing clamping platform, the inner end of the self-closing spring abuts against the inner end inner wall of the air passage valve cavity, the axial outer end surface of the self-closing clamping platform is provided with a self-closing member capable of abutting against the inner end part of the self-closing boss to block the main air passage;

[0010] The air passage valve cavity is provided with a limited exhaust core, the limited exhaust core includes a guide segment and a gas blocking segment arranged in sequence from outside to inside along the axial direction of the air passage valve seat, the outer diameter of the gas blocking segment is larger than the outer diameter of the guide segment, the guide segment is inserted into the secondary air passage in a position matched manner, the outer wall of the guide segment is in a clearance fit with the inner wall of the secondary air passage, the outer end part of the guide segment protrudes out of the outer end surface of the self-closing valve core, the outer peripheral surface of the outer end part of the guide segment is protruded with a limiting stop sheet capable of abutting against the outer end surface of the self-closing valve core, the gas blocking segment is capable of being in a clearance fit with the inner end part of the sealing boss to form an exhaust gap for gas flow, the gas blocking segment is provided with a gas blocking member capable of abutting against the inner end part of the sealing boss, the gas blocking member is linked with the limited exhaust core;

[0011] The outer part of the air passage valve seat is provided with a magnetic induction driving assembly capable of driving the limited exhaust core to reciprocate along the axial direction of the air passage valve seat, the outer part of the air passage valve seat is further provided with a signal interaction module capable of being in communication connection with the magnetic induction driving assembly and an external controller.

[0012] Preferably, a limiting clamping platform is protruded on the inner ring wall of the sealing boss, a limiting spring is coaxially sleeved on the outer peripheral part of the guide segment, the outer end part of the limiting spring abuts against the limiting clamping platform, and the inner end part of the limiting spring abuts against the gas blocking segment.

[0013] Preferably, the axial outer end surface of the self-closing clamping platform has a self-closing clamping groove extending in a ring shape, and the self-closing member is a self-closing rubber ring embedded in the self-closing clamping groove.

[0014] Preferably, the side part of the main valve body is provided with a secondary valve body, the air passage valve seat is located in the secondary valve body, and a nylon sealing ring is embedded between the outer wall of the air passage valve seat and the inner wall of the secondary valve body.

[0015] Preferably, the outer wall of the vent valve seat is provided with an inner stepped surface, the inner wall of the auxiliary valve body is provided with an outer stepped surface, the inner stepped surface and the outer stepped surface are arranged in position and gap fit, and the nylon sealing ring is embedded in position between the gap fit of the inner stepped surface and the outer stepped surface.

[0016] Preferably, the vent valve seat and the auxiliary valve body are threadedly connected.

[0017] Preferably, the side of the auxiliary valve body is provided with a locking through hole in the radial direction, the outer wall of the vent valve seat is provided with a locking blind hole matched with the locking through hole in position, a locking pin is inserted into the locking through hole, the locking pin is in interference fit with the locking through hole, and the inner end of the locking pin is inserted into the locking blind hole in position and in interference fit with the locking blind hole.

[0018] Preferably, the magnetic sensing driving assembly is located on the auxiliary valve body, and the magnetic sensing driving assembly comprises a coil housing coaxially sleeved on the outer peripheral part of the vent valve seat and an electromagnetic coil located in the coil housing.

[0019] Preferably, the signal interaction module is an electronic tag sensing module arranged on the outer wall of the coil housing, and the external controller is a computer or a mobile phone.

[0020] Preferably, the outer peripheral part of the air blocking section has an annular clamping groove, and the air blocking piece is a sealing rubber ring embedded in the annular clamping groove.

[0021] The utility model discloses a flow cut -off liquefied petroleum gas self -closing angle valve, in its working process, under the normal non -use gas condition, the self -closing spring stretches, to push the self -closing spool to the outer end station, to make the self -closing piece and the self -closing boss abut, to guarantee the block of main air passage, to prevent the liquefied petroleum gas in the main valve cavity from escaping through the main air passage due to the abnormal opening of hand wheel assembly or pipe fall etc. Under the normal use gas condition, the hand wheel assembly is controlled to open the main valve spool, to make the side valve port, main valve cavity and lower valve port intercommunicate, and the external controller is controlled through the signal interaction module or the magnetic sensing drive assembly is manually controlled by the staff to act, to overcome the elastic extension force of the self -closing spring and drive the self -closing spool to move inward, to make the main air passage restore intercommunication, and the liquefied petroleum gas in the liquefied petroleum gas bottle is passed into the main valve cavity through the lower valve port, and then is passed into the main air passage through the side valve port, and the liquefied petroleum gas in the main air passage is sequentially delivered to the air inlet through the exhaust gap and vice air passage, and is finally discharged to the downstream gas -using equipment through the air inlet. When the liquefied petroleum gas leaks, the flow of the liquefied petroleum gas in the main valve cavity suddenly increases, the thrust of the gas flow on the exhaust limiting iron core correspondingly increases, the exhaust limiting iron core is pushed from inside to outside under the pressure of high pressure liquefied petroleum gas, and the exhaust limiting iron core is pushed from inside to outside until the exhaust limiting piece abuts against the inner end of the sealing boss, thereby cutting off the normal discharge path of the liquefied petroleum gas, and the liquefied petroleum gas is not discharged through the air inlet, thereby effectively preventing further leakage of the liquefied petroleum gas, reducing the risk of explosion and explosion, improving the use safety of the bottled liquefied petroleum gas, and protecting the personal safety of the related users. After the liquefied petroleum gas leakage fault is eliminated through maintenance, the exhaust limiting iron core can be driven to move axially from outside to inside to reset through the manual reset mode of the staff, so that the exhaust limiting piece is reset with the exhaust limiting iron core to be out of contact with the sealing boss, and the exhaust limiting piece is reset with the exhaust limiting iron core to be out of contact with the sealing boss, thereby making the exhaust gap re -intercommunicate, so that the internal exhaust passage of the air valve cavity is re -penetrated, and the liquefied petroleum gas can still be sequentially discharged through the lower valve port, main valve cavity, side valve port, flow guide cavity, exhaust gap, vice air passage and air inlet under the subsequent normal condition, to meet the working requirement of the downstream gas -using equipment.

[0022] In another preferred scheme of the utility model, the inner ring wall of the sealing boss is provided with a limiting card table, the outer circumferential part of the guide section is coaxially sleeved with a limiting spring, the outer end part of the limiting spring is in abutment with the limiting card table, and the inner end part of the limiting spring is in abutment with the gas resistance section. Under normal working conditions, the limiting spring keeps natural stretching state, so as to maintain the cooperation gap between the gas resistance section and the sealing boss, and ensure the smooth conduction of the exhaust gap. When the gas flow increases and the gas pressure rises due to the leakage of liquefied petroleum gas and other conditions, the gas resistance section is impacted by the high pressure gas from the main valve cavity and overcomes the elastic stretching force of the limiting spring to move towards the direction close to the air inlet, until the gas resistance section is in abutment with the sealing boss to block the exhaust gap. When the leakage of liquefied petroleum gas is eliminated and the equipment can return to normal working conditions, the gas resistance section is no longer impacted by the high pressure gas from the main valve cavity, so that the limiting spring can be stretched again, and the elastic stretching reset force of the limiting spring drives the limiting exhaust iron core to move and reset synchronously, until the gas resistance section is separated from the sealing boss and the exhaust gap is re-conducted. Therefore, the limiting spring can not only relieve the structural impact between the gas resistance section and the sealing boss during the blocking process of the exhaust gap, but also improve the reset action efficiency of the limiting exhaust iron core and related cooperating parts. BRIEF DESCRIPTION OF DRAWINGS

[0023] In order to more clearly illustrate the technical scheme in the embodiments of the utility model or the prior art, the drawings needed to be used in the following embodiment or prior art description will be briefly introduced. Obviously, the drawings in the following description are only some embodiments of the utility model, and other drawings can be obtained by those skilled in the art without creative labor.

[0024] Figure 1 The assembly structure front view of the overcurrent cut-off liquefied petroleum gas self-closing angle valve under normal gas working condition is provided in a specific embodiment of the utility model.

[0025] Figure 2 For Figure 1 The assembly structure front view of the overcurrent cut-off liquefied petroleum gas self-closing angle valve under normal gas working condition is provided in a specific embodiment of the utility model.

[0026] Figure 3 For Figure 1 The assembly structure front view of the overcurrent cut-off liquefied petroleum gas self-closing angle valve under normal gas working condition is provided in a specific embodiment of the utility model.

[0027] Among them:

[0028] 10-main valve body; 101-main valve cavity; 102-lower valve port; 103-side valve port; 104-main valve core; 105-hand wheel assembly;

[0029] 11-Vent valve seat; 111-Vent valve cavity; 112-Vent port; 113-Inner stepped surface; 114-Locking blind hole; 115-Self-closing boss; 116-Main vent;

[0030] 12-Self-closing valve core; 121-Flow guide cavity; 122-Sealing boss; 123-Secondary vent; 124-Self-closing locking platform; 125-Self-closing spring; 126-Self-closing component; 127-Limit locking platform; 128-Limiting spring; 129-Self-closing slot;

[0031] 13-Limited exhaust core; 131-Guide section; 132-Air blocking section; 133-Exhaust gap; 134-Air blocking component;

[0032] 20-Subsidiary valve body; 201-Outer stepped surface; 202-Locking through hole;

[0033] 21-Nylon sealing ring;

[0034] 22-O-ring seal;

[0035] 23-Locking pin;

[0036] 24 - Electromagnetic coil; 241 - Coil housing;

[0037] 30 - Liquefied petroleum gas cylinder. Detailed Implementation

[0038] The core of this utility model is to provide an overcurrent shut-off liquefied petroleum gas self-closing angle valve. This overcurrent shut-off liquefied petroleum gas self-closing angle valve can accurately and efficiently shut off the gas path when liquefied petroleum gas leaks and causes excessive valve flow, thereby preventing further leakage of liquefied petroleum gas and improving the safety of bottled liquefied petroleum gas.

[0039] To enable those skilled in the art to better understand the present invention, the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0040] It should be noted in advance that, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing" in this utility model should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0041] Furthermore, in this invention, unless otherwise explicitly specified and limited, the first feature being "on" or "below" the second feature may include direct contact between the first and second features, or contact between the first and second features not being in direct contact but through another feature between them.

[0042] In addition, the terms "above," "over," and "on top" for the first feature and the second feature include the first feature being directly above or diagonally above the second feature, or simply indicating that the first feature is at a higher horizontal level than the second feature. Similarly, "below," "under," and "beneath" for the first feature and the second feature include the first feature being directly below or diagonally below the second feature, or simply indicating that the first feature is at a lower horizontal level than the second feature. The terms "above," "below," "front," "back," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model.

[0043] Please refer to the reference. Figures 1 to 3 .

[0044] In a specific embodiment, the overcurrent shut-off liquefied petroleum gas self-closing angle valve provided by this utility model includes a main valve body 10 with a main valve cavity 101 inside. The bottom of the main valve body 10 has a lower valve port 102 communicating with the main valve cavity 101. The side of the main valve body 10 has a side valve port 103 communicating with the main valve cavity 101. A main valve core 104 is provided in the main valve cavity 101 for switching on and off. A handwheel assembly 105 that is rotatably connected to the main valve core 104 is provided on the top of the main valve body 10.

[0045] A vent valve seat 11 is provided on the side of the main valve body 10. The vent valve seat 11 has a vent valve cavity 111 inside. The outer end of the vent valve seat 11 has a vent port 112 that communicates with the vent valve cavity 111. The vent valve cavity 111 is connected to the main valve cavity 101 through a side valve port 103. A self-closing boss 115 is provided on the inner ring wall of the vent valve seat 11 along its radial direction. The self-closing boss 115 extends along the circumference of the vent valve seat 11 and is connected end to end to form a main vent passage 116 extending axially along the vent valve seat 11 on the inner side of the self-closing boss 115.

[0046] A self-closing valve core 12 is provided inside the main vent 116. The self-closing valve core 12 has a flow guide cavity 121 inside. A sealing boss 122 is provided on the inner ring wall of the self-closing valve core 12 along its radial direction. The sealing boss 122 extends along the circumference of the self-closing valve core 12 and is connected end to end to form a secondary vent 123 extending along the axial direction of the self-closing valve core 12 on the inner side of the sealing boss 122.

[0047] The inner end of the self-closing valve core 12 has a self-closing latch 124 that extends circumferentially and is connected end to end. The inner end of the self-closing valve core 12 is fitted with a self-closing spring 125. The outer end of the self-closing spring 125 abuts against the axial inner end face of the self-closing latch 124, and the inner end of the self-closing spring 125 abuts against the inner wall of the vent valve cavity 111. The axial outer end face of the self-closing latch 124 is provided with a self-closing member 126 that can abut against the inner end of the self-closing boss 115 to block the main vent 116.

[0048] A limiting exhaust core 13 is provided inside the vent valve cavity 111. The limiting exhaust core 13 includes a guide section 131 and an air-blocking section 132 arranged sequentially from the outside to the inside along the axial direction of the vent valve seat 11. The outer diameter of the air-blocking section 132 is larger than the outer diameter of the guide section 131. The guide section 131 is inserted into the secondary vent passage 123, and the outer wall of the guide section 131 is clearance-fitted with the inner wall of the secondary vent passage 123. The outer end of the guide section 131 extends out of the outer end face of the self-closing valve core 12, and a limiting baffle that can abut against the outer end face of the self-closing valve core 12 is provided on the outer peripheral surface of the outer end of the guide section 131. The air-blocking section 132 can be clearance-fitted with the inner end of the sealing boss 122 to form an exhaust gap 133 for airflow. An air-blocking element 134 that can abut against the inner end of the sealing boss 122 is provided on the air-blocking section 132. The air-blocking element 134 is linked with the limiting exhaust core 13.

[0049] The vent valve seat 11 is provided with a magnetic drive component that can drive the discharge limiting iron core 13 to reciprocate along the axial direction of the vent valve seat 11. The vent valve seat 11 is also provided with a signal interaction module that can communicate with the magnetic drive component and the external controller.

[0050] During its operation, under normal non-gas-use conditions, the self-closing spring 125 extends to push the self-closing valve core 12 to the outer end position, thereby causing the self-closing component 126 to abut against the self-closing boss 115 to ensure the blockage of the main vent 116, so as to prevent the liquefied petroleum gas in the main valve chamber 101 from escaping through the main vent 116 due to abnormal opening of the handwheel assembly 105 or pipeline detachment.

[0051] Under normal gas usage conditions, the main valve core 104 is opened by using the handwheel assembly 105, so that the side valve port 103, the main valve chamber 101 and the lower valve port 102 are interconnected. The pressure reducing valve is connected at the side valve port 103 or other corresponding positions. The magnetic drive assembly is operated by an external controller via a signal interaction module or manually by the operator to overcome the elastic extension force of the self-closing spring 125 and drive the self-closing valve core 12 to move inward, so that the main vent 116 is restored to conduction. The liquefied petroleum gas in the liquefied petroleum gas cylinder 30 enters the main valve chamber 101 through the lower valve port 102, and then enters the main vent 116 through the side valve port 103. The liquefied petroleum gas entering the main vent 116 is successively transported to the vent 112 through the exhaust gap 133 and the auxiliary vent 123, and finally discharged to the downstream gas-using equipment through the vent 112.

[0052] When liquefied petroleum gas (LPG) leaks, the flow rate of LPG delivered from LPG cylinder 30 to the main valve chamber 101 suddenly increases. The thrust of the airflow on the limiting iron core increases accordingly, causing the limiting iron core 13 to be pushed from the inside out under the pressure of the high-pressure LPG until the gas blocking element 134 abuts against the inner end of the sealing boss 122, thereby blocking the exhaust gap 133. At this time, the normal discharge path of LPG is cut off and it will no longer be discharged through the vent 112, thus effectively preventing further leakage of LPG, reducing the corresponding risks of deflagration and explosion, improving the safety of bottled LPG use, and ensuring the personal safety of relevant users.

[0053] Correspondingly, the magnetic drive component is activated automatically or manually via an external controller after detecting a liquefied petroleum gas leak, causing the limiting iron core to move laterally from the inside out, thereby blocking the liquefied petroleum gas leak.

[0054] After the liquefied petroleum gas leak is eliminated through inspection and maintenance, the staff can manually reset the limiting iron core 13 by moving it axially from the outside to the inside. This causes the gas blocking element 134 to reset along with the limiting iron core 13 and disengage from the sealing boss 122, thereby reopening the exhaust gap 133. This allows the internal exhaust passage of the vent valve chamber 111 to be reopened, ensuring that under normal operating conditions, liquefied petroleum gas can still be smoothly discharged in the following sequence: lower valve port 102, main valve chamber 101, side valve port 103, guide chamber 121, exhaust gap 133, secondary vent 123, and vent 112, to meet the operating requirements of downstream gas-using equipment.

[0055] Of course, the reset control method and action form of the limited discharge core 13 can also be adjusted according to the actual working conditions of the valve. These can be flexibly judged and selected based on the actual working conditions in the industry.

[0056] It should be understood that in practical applications, the arrangement and operation of the handwheel assembly 105, the main valve body 10 and its associated valve chambers and valve ports can be understood by referring to the conventional component layout in the industry, and will not be elaborated further in this article.

[0057] Specifically, a limiting plate 127 protrudes from the inner ring wall of the sealing boss 122, and a limiting spring 128 is coaxially sleeved on the outer periphery of the guide section 131. The outer end of the limiting spring 128 abuts against the limiting plate 127, and the inner end of the limiting spring 128 abuts against the air-blocking section 132. Generally, the limiting plate 127 can also be correspondingly arranged inside the vent valve cavity 111 at a position that can align and adapt with the outer end of the limiting spring 128.

[0058] Under normal operating conditions, the limiting spring 128 remains in a naturally extended state to maintain the fit clearance between the gas blocking element 134 and the sealing boss 122, ensuring smooth conduction of the exhaust gap 133. When the gas flow and pressure increase due to liquefied petroleum gas leakage, the gas blocking section 132 is impacted by the high-pressure gas from the main valve chamber 101 and overcomes the elastic extension force of the limiting spring 128 to move towards the vent 112 until the gas blocking element 134 abuts against the sealing boss 122, thus blocking the exhaust gap 133.

[0059] Once the liquefied petroleum gas leak is resolved and the equipment can return to normal operation, the gas blocking section 132 will no longer be impacted by high-pressure gas from the direction of the main valve chamber 101. As a result, the limit spring 128 can be extended again. When the operator manually operates to reset the exhaust core 13, the elastic extension and reset force of the limit spring 128 will drive the exhaust core 13 to move and reset synchronously until the gas blocking component 134 disengages from the sealing boss 122 and the exhaust gap 133 is reopened.

[0060] It can be seen that the limiting spring 128 can not only alleviate the structural impact between the air blocking component 134 and the sealing boss 122 during the blocking of the exhaust gap 133, but also improve the reset efficiency of the limiting iron core 13 and its related mating parts.

[0061] Of course, the reset of the limiting discharge core 13 can also be achieved manually by the operator. This manual operation can be achieved by a linkage operating component integrated on the limiting discharge core 13, or by other operating methods that can match the working conditions. In practical applications, the specific component structure and application conditions can be flexibly selected and adjusted. In principle, any method that can meet the specific application requirements of the overcurrent cut-off liquefied petroleum gas self-closing angle valve is acceptable.

[0062] Furthermore, it should be noted that through the communication between the signal interaction module and the magnetic drive component, and in conjunction with the liquefied petroleum gas monitoring and alarm device arranged on the overcurrent cut-off liquefied petroleum gas self-closing angle valve or its upstream and downstream supporting pipelines and equipment, real-time monitoring of liquefied petroleum gas leakage is achieved. Based on the monitoring results, corresponding control signals are fed back to control the corresponding action of the magnetic drive component, thereby driving the exhaust limiting iron core 13 to move so that the gas blocking component 134 and the sealing boss 122 are aligned and abutted or disengaged, thereby achieving the blocking and conduction of the exhaust gap 133.

[0063] Accordingly, the device used to monitor for liquefied petroleum gas (LPG) leaks can be a sensor alarm device capable of monitoring LPG concentration, or a sensor alarm device capable of monitoring the local flow rate and pressure of LPG. In practical applications, the appropriate device can be flexibly selected and adjusted based on specific operating conditions and equipment layout. Generally, if a monitoring method targeting the local flow rate of LPG is used, the alarm parameter is typically set when the instantaneous flow rate of LPG at the corresponding pipeline or valve reaches 0.0 to 0.0 times the rated flow rate, triggering an alarm signal.

[0064] More specifically, the axial outer end face of the self-closing locking plate 124 has an annularly extended self-closing groove 129, and the self-closing element 126 is a self-closing rubber ring embedded in the self-closing groove 129. The self-closing rubber ring is generally an annular part made of rubber or silicone to fully fit and adapt to the self-closing groove 129 and to fully conform and abut against the self-closing boss 115, ensuring the blocking effect of the main air passage 116.

[0065] On the other hand, a secondary valve body 20 is provided on the side of the main valve body 10, and a vent valve seat 11 is located inside the secondary valve body 20. A nylon sealing ring 21 is embedded between the outer wall of the vent valve seat 11 and the inner wall of the secondary valve body 20. Arranging the vent valve seat 11 inside the secondary valve body 20 can further improve the component structure integration of the overcurrent shut-off liquefied petroleum gas self-closing angle valve. Combined with the nylon sealing ring 21, the structural sealing effect between the vent valve seat 11 and the secondary valve body 20 can be further optimized, preventing liquefied petroleum gas from leaking through the possible fitting gap between the outer wall of the vent valve seat 11 and the inner wall of the secondary valve body 20, thereby further improving the safety of the overcurrent shut-off liquefied petroleum gas self-closing angle valve.

[0066] Based on this, an inner stepped surface 113 is bent on the outer wall of the vent valve seat 11, and an outer stepped surface 201 is bent on the inner wall of the secondary valve body 20. The inner stepped surface 113 and the outer stepped surface 201 are aligned and fitted with a clearance, and the nylon sealing ring 21 is aligned and embedded in the fitting gap between the inner stepped surface 113 and the outer stepped surface 201. By utilizing the alignment and fit between the inner stepped surface 113 and the outer stepped surface 201, the nylon sealing ring 21 can be reliably engaged and limited to prevent the nylon sealing ring 21 from loosening or misaligning, thereby further ensuring a reliable seal between the vent valve seat 11 and the circumferential mating surfaces of the secondary valve body 20.

[0067] Correspondingly, an O-ring 22 or other sealing element can be installed between the outer wall of the vent valve seat 11 and the inner wall of the secondary valve body 20 to ensure structural sealing at different mating positions between the vent valve seat 11 and the secondary valve body 20 circumferential mating surfaces. This further optimizes the structural sealing effect between the vent valve seat 11 and the secondary valve body 20, making the overall airtightness of the overflow cut-off liquefied petroleum gas self-closing angle valve higher and its operation safer and more reliable.

[0068] Generally, the vent valve seat 11 and the auxiliary valve body 20 are connected by threads. Specifically, this can be achieved by aligning the external threads on the outer wall of the vent valve seat 11 with the internal threads on the inner wall of the auxiliary valve body 20. This type of threaded connection offers high assembly strength and convenient and efficient disassembly and assembly operations, effectively optimizing the efficiency of disassembly and assembly operations of the vent valve seat 11, the auxiliary valve body 20, and related supporting components, thus facilitating component inspection, maintenance, and replacement.

[0069] Furthermore, a locking through-hole 202 extends radially through the side of the secondary valve body 20. The outer wall of the vent valve seat 11 has a locking blind hole 114 that aligns with the locking through-hole 202. A locking pin 23 is inserted into the locking through-hole 202, with an interference fit. The inner end of the locking pin 23 is also inserted into the locking blind hole 114 with an interference fit. This locking pin 23 can moderately disrupt the threaded connection between the vent valve seat 11 and the secondary valve body 20, preventing loosening of the assembly structure or failure of the connection structure between the vent valve seat 11 and the secondary valve body 20. Simultaneously, the interference fit between the locking pin 23 and the locking through-hole 202 and the locking blind hole 114 effectively ensures the airtightness of the corresponding mating points of the locking pin 23, thereby further preventing liquefied petroleum gas leakage and improving the operational safety of the overcurrent shut-off liquefied petroleum gas self-closing angle valve.

[0070] In addition, the magnetic drive assembly is located within the secondary valve body 20, and includes a coil housing 241 coaxially sleeved on the outer periphery of the vent valve seat 11 and an electromagnetic coil 24 located within the coil housing 241. The coil housing 241 provides structural protection and support for the electromagnetic coil 24, ensuring a constant assembly position of the electromagnetic coil 24. This improves the magnetic coupling effect between the electromagnetic coil 24 and the discharge limiting iron core 13, thereby correspondingly improving the working performance and operating efficiency of the overcurrent cut-off liquefied petroleum gas self-closing angle valve.

[0071] In practical applications, the signal interaction module can be an electronic tag sensing module mounted on the outer wall of the coil housing 241, with an external controller such as a computer or mobile phone. This electronic tag sensing module can communicate with sensors or other compatible components at valve ports to detect or receive liquefied petroleum gas leaks. Of course, the communication methods between the electronic tag sensing module and computers, mobile phones, or other corresponding sensors are fairly standard in the industry, and operators can flexibly choose and apply them according to actual working conditions; further details are omitted here.

[0072] Furthermore, the outer periphery of the gas-blocking section 132 has an annular groove, and the gas-blocking element 134 is a sealing ring embedded in the annular groove. Alternatively, the gas-blocking element 134 can be a spherical or annular arc surface structure integrated into the outer periphery of the gas-blocking section 132, forming a reliable circumferential annular contact with the sealing boss 122 to ensure complete blockage of the exhaust gap 133. In practical applications, operators can flexibly select and adjust the specific structural form and application type of the gas-blocking element 134 based on the specific component layout and operating conditions. In principle, any design that meets the practical application requirements of the overflow-cutting liquefied petroleum gas self-closing angle valve is acceptable.

[0073] In summary, the overcurrent shut-off liquefied petroleum gas self-closing angle valve provided in this utility model, during its operation, under normal gas usage conditions, uses the handwheel assembly to control the main valve core to open, so that the side valve port, the main valve chamber, and the lower valve port are interconnected. The liquefied petroleum gas in the liquefied petroleum gas cylinder enters the main valve chamber through the lower valve port, and then exits the main valve chamber through the side valve port. After the liquefied petroleum gas is discharged from the side valve port, it is successively transported to the vent through the exhaust gap and the auxiliary vent, and finally discharged to the downstream gas-using equipment through the vent. When liquefied petroleum gas (LPG) leaks, the flow rate of LPG delivered from the LPG cylinder to the main valve chamber suddenly increases. The thrust of the airflow on the limiting iron core increases, causing the limiting iron core to be pushed from the inside out under the pressure of the high-pressure LPG until the gas-blocking element abuts against the inner end of the sealing boss, thus blocking the exhaust gap. At this point, the normal discharge path of LPG is cut off, and it will no longer be discharged through the vent, thereby effectively preventing further leakage of LPG, reducing the corresponding risks of deflagration and explosion, improving the safety of bottled LPG use, and ensuring the personal safety of relevant users. After the liquefied petroleum gas leak is eliminated through inspection and maintenance, the staff can manually reset it by moving the limiting iron core axially from the outside to the inside. This causes the gas blocking component to reset along with the limiting iron core and disengage from the sealing boss, thereby reopening the exhaust gap. This allows the internal exhaust passage of the vent valve chamber to be reopened, ensuring that under normal operating conditions, liquefied petroleum gas can still be smoothly discharged in the following sequence: lower valve port, main valve chamber, side valve port, exhaust gap, secondary vent passage, and vent, thus meeting the operating requirements of downstream gas-using equipment.

[0074] The above provides a detailed description of the self-closing angle valve for overcurrent shut-off liquefied petroleum gas provided by this utility model. Specific examples have been used to illustrate the principle and implementation of this utility model. The descriptions of the embodiments above are merely for the purpose of helping to understand the method and core idea of ​​this utility model. It should be noted that those skilled in the art can make various improvements and modifications to this utility model without departing from its principles, and these improvements and modifications also fall within the protection scope of the claims of this utility model.

Claims

1. An over-flow shut-off liquefied petroleum gas self-closing angle valve, characterized by, The main valve body has a main valve cavity inside, the bottom of the main valve body has a lower valve port communicating with the main valve cavity, the side of the main valve body has a side valve port communicating with the main valve cavity, and the main valve cavity is provided with a main valve core in an on-off manner. The side of the main valve body is provided with an air vent valve seat, the air vent valve seat has an air vent valve cavity inside, the outer end of the air vent valve seat has an air vent port communicating with the air vent valve cavity, the air vent valve cavity communicates with the main valve cavity through the side valve port, the inner ring wall of the air vent valve seat is provided with a self-closing boss protruding radially along the air vent valve seat, the self-closing boss extends along the circumference of the air vent valve seat and is connected end to end to form a main air passage extending along the axis of the air vent valve seat on the inner side of the self-closing boss. The main air passage is provided with a self-closing valve core, the self-closing valve core has a flow guide cavity inside, the inner ring wall of the self-closing valve core is provided with a sealing boss protruding radially along the self-closing valve core, the sealing boss extends along the circumference of the self-closing valve core and is connected end to end to form a secondary air passage extending along the axis of the self-closing valve core on the inner side of the sealing boss. The inner end of the self-closing valve core is provided with a self-closing clamping post protruding along the circumference and connected end to end, and the inner end of the self-closing valve core is sleeved with a self-closing spring, the outer end of the self-closing spring abuts against the axial inner end surface of the self-closing clamping post, the inner end of the self-closing spring abuts against the inner end inner wall of the air vent valve cavity, and the axial outer end surface of the self-closing clamping post is provided with a self-closing member capable of abutting against the inner end of the self-closing boss to block the main air passage. The flow guide cavity is provided with a limited exhaust core, the limited exhaust core includes a guide section and a gas blocking section arranged in sequence from outside to inside along the axis of the air vent valve seat, the outer diameter of the gas blocking section is larger than that of the guide section, the guide section is inserted into the secondary air passage in a positional relationship, the outer wall of the guide section is in clearance fit with the inner wall of the secondary air passage, the outer end of the guide section protrudes from the outer end surface of the self-closing valve core, and the outer end of the guide section is provided with a limiting stop piece capable of abutting against the outer end surface of the self-closing valve core, the gas blocking section is capable of clearance fit with the inner end of the sealing boss to form an exhaust gap for gas flow, the gas blocking section is provided with a gas blocking member capable of abutting against the inner end of the sealing boss, and the gas blocking member is linked with the limited exhaust core. The outer part of the air vent valve seat is provided with a magnetic induction driving assembly capable of driving the limited exhaust core to move reciprocatingly along the axis of the air vent valve seat, and the outer part of the air vent valve seat is further provided with a signal interaction module capable of communicating with the magnetic induction driving assembly and an external controller.

2. The over-flow shut-off liquefied petroleum gas self-closing angle valve according to claim 1, wherein The inner ring wall of the sealing boss is provided with a limiting clamping post, the outer circumferential part of the guide section is coaxially sleeved with a limiting spring, the outer end of the limiting spring abuts against the limiting clamping post, and the inner end of the limiting spring abuts against the gas blocking section.

3. The over-flow shut-off liquefied petroleum gas self-closing angle valve according to claim 2, wherein The axial outer end surface of the self-closing clamping post has a self-closing clamping groove extending in a ring shape, and the self-closing member is a self-closing rubber ring embedded in the self-closing clamping groove.

4. The over-flow shut-off liquefied petroleum gas self-closing angle valve according to claim 1, wherein The side of the main valve body is provided with a secondary valve body, the vent valve seat is located in the secondary valve body, and a nylon sealing ring is embedded between the outer wall of the vent valve seat and the inner wall of the secondary valve body.

5. The over-flow shutoff liquefied petroleum gas self-closing angle valve according to claim 4, wherein An inner step surface is arranged on the outer wall of the vent valve seat by bending, an outer step surface is arranged on the inner wall of the secondary valve body by bending, the inner step surface and the outer step surface are arranged in position and gap fit, and the nylon sealing ring is embedded in the fitting gap between the inner step surface and the outer step surface.

6. The over-flow shut-off liquefied petroleum gas self-closing angle valve according to claim 4, wherein The vent valve seat is threadedly connected with the secondary valve body.

7. The over-flow shutoff liquefied petroleum gas self-closing angle valve according to claim 6, wherein A locking through hole is radially penetrated through the side of the secondary valve body, the outer wall of the vent valve seat has a locking blind hole matched with the locking through hole in position, a lock pin is inserted into the locking through hole, the lock pin is in interference fit with the locking through hole, and the inner end of the lock pin is inserted into the locking blind hole in position and in interference fit with the locking blind hole.

8. The over-flow shut-off liquefied petroleum gas self-closing angle valve according to claim 4, wherein The magnetic induction driving assembly is located on the secondary valve body, and the magnetic induction driving assembly comprises a coil shell coaxially sleeved on the outer peripheral part of the vent valve seat and an electromagnetic coil located in the coil shell.

9. The over-flow shut-off liquefied petroleum gas self-closing angle valve according to claim 8, wherein, The signal interaction module is an electronic tag sensing module arranged on the outer wall of the coil shell, and the external controller is a computer or a mobile phone.

10. The over-flow shut-off liquefied petroleum gas self-closing valve according to claim 1, wherein The outer peripheral part of the air blocking section has an annular clamping groove, and the air blocking member is a sealing rubber ring embedded in the annular clamping groove.

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