LPG (Liquefied Petroleum Gas) pipeline overpressure, pressure drop and overtemperature self-closing safety device

Abstract

The utility model discloses an overpressure, pressure drop and overtemperature self-closing safety device for an LPG pipeline, which comprises an annular diaphragm, an upper valve cover and a bottom valve body, the upper valve cover and the bottom valve body are detachably mounted together, a T-shaped flow channel is arranged at the bottom of the bottom valve body, a sleeve is arranged in the vertical end of the T-shaped flow channel, a circulation hole is formed in the side wall of the sleeve, and the lower valve cover is arranged in the circulation hole. The sleeve is provided with an overtemperature self-closing assembly used for blocking the circulation hole, the overtemperature self-closing assembly comprises a hot melting piece and a closing plate, the closing plate is installed in the inner wall of the sleeve in a sliding mode, and the top end of the closing plate is connected with a guide rod. While the self-closing operation after overpressure and pressure drop can be realized, an overtemperature self-closing part is additionally designed, when the external temperature is too high, the hot melting piece is melted by high temperature, and at the moment, the closing plate can be driven to descend and block the circulation hole under the rebound action of the spring, so that gas leakage in the pipeline is avoided, and the service life of the pipeline is prolonged. And therefore, the safety of the whole body during use is ensured.

Description

Technical Field

[0001] The utility model belongs to the technical field of LPG pipeline protection, in particular to an LPG pipeline overpressure, underpressure and overtemperature self-closing safety device. Background Art

[0002] The self-closing valve is also called the pipeline gas self-closing valve, which is installed on the indoor gas pipeline. When there is an abnormal situation such as overpressure, underpressure, or overcurrent in the pipeline due to gas outage, abnormal gas supply, or hose detachment, it can automatically close without electricity or other external power and needs to be opened manually.

[0003] A Chinese patent with the publication number CN112283427B discloses a gas self-closing valve. The upper valve body is connected to the lower valve body to form a main valve body, and a flow channel is arranged at the bottom of the lower valve body. The gas self-closing valve of the present invention sets the internal force condition by magnetic force, and realizes the up and down movement of the valve core by the internal and external pressure difference, so as to achieve the function of valve self-closing, prevent the occurrence of gas pipeline danger, and improve the safety of pipeline use.

[0004] However, the applicant found in actual use that when a fire occurs or other external factors cause the temperature of the kitchen space to rise, the internal air pressure remains basically unchanged at this time, causing the pipeline to remain in a conductive state, which can easily lead to gas leakage and fire, and the safety is poor.

[0005] In view of this, an LPG pipeline overpressure, underpressure and overtemperature self-closing safety device is proposed. Utility Model Content

[0006] The purpose of the utility model is to provide an LPG pipeline overpressure, underpressure and overtemperature self-closing safety device in order to solve the above-mentioned problems.

[0007] The technical solution adopted by the utility model is as follows: an LPG pipeline over-pressure, under-pressure and over-temperature self-closing safety device, comprising an annular diaphragm and an upper valve cover and a bottom valve body that are detachably installed together, the bottom of the bottom valve body is provided with a T-shaped flow channel, a sleeve is provided inside the vertical end of the T-shaped flow channel, a flow hole is provided on the side wall of the sleeve, an over-temperature self-closing component for sealing the flow hole is provided on the sleeve, and the over-temperature self-closing component comprises a hot melt and a closing plate, wherein: the closing plate is slidably installed in the inner wall of the sleeve, the top end of the closing plate is connected to a guide rod, the upper end surface of the guide rod is provided with a limiting ring, a spring sleeved on the guide rod is installed between the limiting ring and the top wall of the sleeve, a through hole is provided on the hot melt to allow the guide rod to pass through, and the diameter of the through hole of the hot melt is smaller than the size of the limiting ring.

[0008] In a preferred embodiment, the size of the closing plate is larger than that of the circulation hole, and the closing plate is located directly above the circulation hole. A groove for inserting the closing plate is formed on the inner wall of the sleeve below the circulation hole.

[0009] In a preferred embodiment, the T-shaped flow channel has an air inlet and an air outlet at both ends, the flow hole is connected to the air inlet, the upper side of the sleeve has an opening, and the sleeve contains the valve core which is smaller than its height.

[0010] In a preferred embodiment, the valve core has a hollow cavity inside, a connecting hole is opened on the side wall of the valve core facing the flow hole, a plurality of air guide holes are opened circumferentially on the upper end surface of the valve core, and the outer wall of the valve core is in contact with the inner wall of the sleeve.

[0011] In a preferred embodiment, the annular diaphragm is installed between the inner wall of the upper valve cover and the connecting end surface of the bottom valve body, a valve cavity is formed between the bottom valve body and the annular diaphragm, and an air port connected to the valve cavity is provided at the upper end of the air outlet.

[0012] In a preferred embodiment, a valve stem is provided at the top end of the valve core, the upper end of the valve stem passes through the upper valve cover and is connected to a twist piece, and the middle part of the annular diaphragm is installed on the valve stem.

[0013] In a preferred embodiment, a fixed magnetic ring is threadedly mounted on the inner wall of the upper valve cover, a movable magnetic ring mounted on the valve stem is provided above the fixed magnetic ring, and an upper magnetic ring is embedded on the inner wall of the upper end of the upper valve cover at the upper end of the movable magnetic ring.

[0014] To sum up, due to the adoption of the above-mentioned technical scheme, the beneficial effect of the utility model is: while ensuring the self-closing operation after over-pressure and pressure drop, an over-temperature self-closing part is additionally designed. When the external temperature is too high, the hot melt part is designed to melt at high temperature. At this time, under the rebound effect of the spring, the closing plate can be driven down to block the flow hole, thereby avoiding gas leakage in the pipeline, thereby ensuring the overall safety during use. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a schematic diagram of the internal structure of the utility model as a whole;

[0016] Figure 2 for Figure 1 A schematic diagram of the enlarged structure at point a in the middle.

[0017] Markings in the figure: 1-valve stem, 2-upper valve cover, 3-twist-lifting piece, 4-annular diaphragm, 5-upper magnetic ring, 6-movable magnetic ring, 7-fixed magnetic ring, 8-valve chamber, 9-T-shaped flow channel, 10-bottom valve body, 11-air outlet, 12-air inlet, 13-limiting ring, 14-hot melt, 15-guide rod, 16-spring, 17-valve core, 171-air guide hole, 172-connecting hole, 18-closing plate, 19-sleeve, 191-slot, 192-flow hole. DETAILED DESCRIPTION

[0018] In order to make the purpose, technical solution and advantages of the utility model more clear, the utility model is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the utility model and are not used to limit the utility model.

[0019] Reference Figure 1-2 A LPG pipeline overpressure, underpressure and overtemperature self-closing safety device comprises an annular diaphragm 4 and an upper valve cover 2 and a bottom valve body 10 which are detachably mounted together. A T-shaped flow channel 9 is arranged at the bottom of the bottom valve body 10. A sleeve 19 is arranged inside the vertical end of the T-shaped flow channel 9. A flow hole 192 is opened on the side wall of the sleeve 19. An overtemperature self-closing component for blocking the flow hole 192 is arranged on the sleeve 19. The overtemperature self-closing component comprises a hot melt 14 and a closing plate 18. The closing plate 18 is slidably mounted in the inner wall of the sleeve 19. A guide rod 15 is connected to the top of the closing plate 18. A limit ring 13 is provided on the upper end surface of the guide rod 15, and a spring 16 is installed between the limit ring 13 and the top wall of the sleeve 19 and is sleeved on the guide rod 15. A through hole is opened on the hot melt part 14 to allow the guide rod 15 to pass through, and an over-temperature self-closing part is designed. When the external temperature is too high, the hot melt part 14 is melted by the high temperature. At this time, the rebound effect of the spring 16 can drive the closing plate 18 to descend and block the flow hole 192, thereby avoiding gas leakage in the pipeline, thereby ensuring the safety of the whole during use. At the same time, the whole is non-electrically driven, with lower cost and greater safety.

[0020] The temperature setting of the over-temperature protection function of the self-closing valve depends on the melting point of the hot melt 14.

[0021] The lower the melting point, the higher the sensitivity of the self-closing valve. The higher the melting point, the lower the sensitivity of the self-closing valve. The hot melt 14 is preferably a bismuth-tin alloy, but is not limited to the above materials.

[0022] Furthermore, the through hole diameter of the hot melt 14 is smaller than the size of the limiting ring 13. In normal use, the position of the closing plate 18 can be limited by the cooperation between the limiting ring 13 and the hot melt 14, thereby preventing the closing plate 18 from falling and affecting the normal use of the safety valve. The limiting ring 13 can be installed on the guide rod 15 by threading.

[0023] Furthermore, the size of the closing plate 18 is larger than the size of the circulation hole 192, and the closing plate 18 is located directly above the circulation hole 192. A groove 191 is formed on the inner wall of the sleeve 19 below the circulation hole 192 to accommodate the insertion of the closing plate 18. The above design can ensure that the closing plate 18 can completely close the circulation hole 192, thereby avoiding leakage.

[0024] In addition, in order to additionally ensure the sealing performance, a sealing ring that fits the inner wall of the sleeve 19 can be additionally embedded on one or both sides of the closing plate 18, thereby achieving the best sealing effect.

[0025] Furthermore, the T-shaped flow channel 9 has an air inlet 12 and an air outlet 11 at both ends, the flow hole 192 is connected with the air inlet 12, the upper side of the sleeve 19 has an opening, and the sleeve 19 is equipped with a valve core 17 smaller than its height, the valve core 17 has a hollow cavity inside, and the side wall of the valve core 17 facing the flow hole 192 is provided with a connecting hole 172, and the upper end surface of the valve core 17 is circumferentially provided with a plurality of air guide holes 171 (the air guide holes 171 are located at the vertical axis position of the connecting hole 172), and the outer wall of the valve core 17 is in contact with the inner wall of the sleeve 19. When in normal working state, the air guide holes 171 and the flow hole 192 remain in a connected state, thereby meeting the normal transportation of the gas. When it is overpressure or underpressure, the valve core 17 rises or falls accordingly, thereby driving the air guide holes 171 away from the flow hole 192 to achieve self-closing operation.

[0026] Furthermore, the annular diaphragm 4 is installed between the inner wall at the connecting end face of the upper valve cover 2 and the bottom valve body 10, and a valve cavity 8 is formed between the bottom valve body 10 and the annular diaphragm 4. The upper end of the gas outlet 11 is provided with a gas port connected to the valve cavity 8. When the gas guide hole 171 and the flow hole 192 remain connected, the gas can be discharged into the gas port through the valve cavity 8, and then discharged into the gas outlet 11 through the gas port, completing the backward stage of transportation.

[0027] Furthermore, a valve stem 1 is provided at the top of the valve core 17, the upper end of the valve stem 1 passes through the upper valve cover 2 and is connected to a torque piece 3, the middle part of the annular diaphragm 4 is installed on the valve stem 1, a fixed magnetic ring 7 is threadedly installed on the inner wall of the upper valve cover 2, and a movable magnetic ring 6 installed on the valve stem 1 is provided above the fixed magnetic ring 7, and an upper magnetic ring 5 is embedded in the upper inner wall of the upper end of the upper valve cover 2 at the upper end of the movable magnetic ring 6.

[0028] It should be emphasized here that the magnetic distribution of the torsion lift part and the magnetic ring and how to achieve the self-closing operation of overpressure, underpressure and overtemperature can all be referred to in the comparative documents in the background technology. Therefore, the specific structure and installation of the torsion lift part and the magnetic ring will not be elaborated one by one.

[0029] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. An LPG pipeline overpressure, underpressure and overtemperature self-closing safety device, comprising an annular diaphragm and an upper valve cover and a bottom valve body that are detachably mounted together, characterized in that: A T-shaped flow channel is provided at the bottom of the bottom valve body, a sleeve is provided inside the vertical end of the T-shaped flow channel, a flow hole is provided on the side wall of the sleeve, an over-temperature self-closing component for sealing the flow hole is provided on the sleeve, and the over-temperature self-closing component includes a hot melt part and a closing plate, wherein: the closing plate is slidably installed in the inner wall of the sleeve, the top end of the closing plate is connected to a guide rod, the upper end surface of the guide rod is provided with a limiting ring, a spring sleeved on the guide rod is installed between the limiting ring and the top wall of the sleeve, a through hole is provided on the hot melt part to meet the passage of the guide rod, and the diameter of the through hole of the hot melt part is smaller than the size of the limiting ring.

2. The LPG pipeline overpressure, underpressure and overtemperature self-closing safety device according to claim 1, characterized in that: The size of the closing plate is larger than that of the circulation hole, and the closing plate is located directly above the circulation hole. A groove for inserting the closing plate is formed on the inner wall of the sleeve below the circulation hole.

3. The LPG pipeline overpressure, underpressure and overtemperature self-closing safety device according to claim 1, characterized in that: The two ends of the T-shaped flow channel are provided with an air inlet and an air outlet, the flow hole is communicated with the air inlet, the upper side of the sleeve is provided with an opening, and the sleeve is provided with a valve core smaller than its height.

4. The LPG pipeline overpressure, underpressure and overtemperature self-closing safety device according to claim 3, characterized in that: The valve core has a hollow cavity inside, a connecting hole is opened on the side wall of the valve core facing the flow hole, a plurality of air guide holes are opened circumferentially on the upper end surface of the valve core, and the outer wall of the valve core is in contact with the inner wall of the sleeve.

5. The LPG pipeline overpressure, underpressure and overtemperature self-closing safety device according to claim 4, characterized in that: The annular diaphragm is installed between the inner wall of the upper valve cover and the connecting end surface of the bottom valve body, a valve cavity is formed between the bottom valve body and the annular diaphragm, and an air port communicating with the valve cavity is provided at the upper end of the air outlet.

6. The LPG pipeline overpressure, underpressure and overtemperature self-closing safety device according to claim 3, characterized in that: A valve stem is arranged at the top end of the valve core, the upper end of the valve stem passes through the upper valve cover and is connected with a twist piece, and the middle part of the annular diaphragm is installed on the valve stem.

7. An LPG pipeline overpressure, underpressure and overtemperature self-closing safety device as claimed in claim 6, characterized in that: A fixed magnetic ring is threadedly mounted on the inner wall of the upper valve cover, a movable magnetic ring mounted on the valve stem is arranged above the fixed magnetic ring, and an upper magnetic ring is embedded on the inner wall of the upper end of the upper valve cover at the upper end of the movable magnetic ring.

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