CN113431915B

CN113431915B - Liquefied petroleum gas self-closing valve

Info

Publication number: CN113431915B
Application number: CN202110751450.4A
Authority: CN
Inventors: 李树阳
Original assignee: Weihai Guanfu Gas Safety Technology Co ltd
Current assignee: Weihai Guanfu Gas Safety Technology Co ltd
Priority date: 2021-07-02
Filing date: 2021-07-02
Publication date: 2023-01-24
Anticipated expiration: 2041-07-02
Also published as: CN113431915A

Abstract

The invention provides a liquefied petroleum gas self-closing valve which is provided with a valve body, a shell, a valve closing device and a valve opening device, wherein the valve body is provided with an air inlet end and an air outlet end, an execution valve is arranged in the valve body, the shell is fixedly arranged above the valve body, a rotating body is arranged in the shell, a rotating shaft is arranged in the rotating body, the rotating body is fixedly connected with the rotating shaft, the lower end of the rotating shaft is fixedly connected with the execution valve, a positioning groove is arranged on the rotating body, a winding post, a memory alloy wire and a wire pressing terminal are arranged on the valve closing device, and the memory alloy wire penetrates through the positioning groove, bypasses the winding post and is fixed on the wire pressing terminal. The technical problems that secondary afterburning is easily caused after explosion in the use process of the existing liquefied petroleum gas and more risks are brought to safety rescue are solved. The invention can be widely applied to the working condition of the liquefied petroleum gas.

Description

Liquefied petroleum gas self-closing valve

Technical Field

The invention relates to a valve, in particular to a liquefied petroleum gas self-closing valve.

Background

The Liquefied Petroleum Gas (LPG) not only has low explosion limit (1.7-9.7 percent) and large accident risk, but also has low ignition point (about 490 ℃), and secondary reburning is easy to cause after explosion. Once the afterburning occurs, the pressure in the gas tank can also be increased rapidly along with the rise of the environmental temperature, so that the caused serious accident happens sometimes, and great potential safety hazard is brought to the fire rescue work. According to statistics, more than 50% of gas safety accidents which occur in China every year are caused by liquefied petroleum gas.

The valve is widely used in liquefied petroleum gas equipment, but the conventional valve has no function of self-closing in fire and cannot respond to the condition caused by the fire in time.

Disclosure of Invention

The invention provides a liquefied petroleum gas self-closing valve which can be automatically closed in time after explosion happens and avoid secondary accidents, aiming at the technical problems that secondary reburning is easily caused after explosion in the use process of the existing liquefied petroleum gas and more risks are brought to safety rescue.

Therefore, the technical scheme includes that the liquefied petroleum gas self-closing valve is provided with a valve body, a shell, a valve closing device and a valve opening device, wherein the valve body is provided with an air inlet end and an air outlet end, an execution valve is arranged in the valve body, the shell is fixedly arranged above the valve body, a rotating body is arranged in the shell, a rotating shaft is arranged in the rotating body and fixedly connected with the rotating shaft, the lower end of the rotating shaft is fixedly connected with the execution valve, a positioning groove is formed in the rotating body, a winding column, a memory alloy wire and a wire pressing terminal are arranged on the valve closing device, and the memory alloy wire penetrates through the positioning groove, bypasses the winding column and is fixed on the wire pressing terminal.

Preferably, the line pressing terminal is further connected with an external power supply, the liquefied petroleum gas self-closing valve is further provided with a leakage detector and a temperature sensor, the leakage detector and the temperature sensor are both connected with a control module, the control module is connected with the external power supply, and the control module is used for controlling the on-off of the external power supply.

Preferably, a pressure measuring hole is formed above the air outlet end of the valve body, a pressure sensor is arranged above the pressure measuring hole, and the pressure sensor is connected with an alarm device.

Preferably, a sealing gasket is arranged between the execution valve and the valve body, and the execution valve adopts a valve which can be closed by rotating 90 degrees.

Preferably, a boss is arranged on the rotating shaft, a groove is formed in the boss, a sealing ring is arranged in the groove, and a baffle ring is arranged between the upper end face of the boss and the inner end face of the valve body.

Preferably, a magnet frame is arranged on the rotor, a magnet is arranged on the magnet frame, and the magnet frame is detachably fixed on the rotor.

Preferably, a hall sensor is arranged above the shell, and when the execution valve is in a closed state, the hall sensor is positioned right above the magnet.

Preferably, the shape of the upper part of the rotating body is provided with a trapezoidal buckle, the lower part of the magnet frame is provided with a blind hole, the inner wall of the blind hole is provided with a groove, and the size of the groove is matched with the trapezoidal buckle of the rotating body; a bar-shaped positioning table is arranged downwards in the blind hole and is arranged in the positioning groove.

Preferably, the wrapping post includes wrapping post, no. two wrapping posts, no. three wrapping posts, no. four wrapping posts, no. five wrapping posts and No. six wrapping posts, the line ball terminal includes first line ball terminal and second line ball terminal, be equipped with the wire winding groove on the rotor, memory alloy line one end is connected on the first line ball terminal, walk around in proper order wrapping post, no. two wrapping posts, no. three wrapping posts, walk around again the wire winding groove on the rotor passes the constant head tank is followed again the wire winding groove of rotor opposite side is walked around again No. four wrapping posts, no. five wrapping posts, no. six wrapping posts, then fix to on the second line ball terminal.

Preferably, a manual wrench is arranged on the valve opening device, and the manual wrench is arranged on the rotating body.

The beneficial effects of the invention are that,

(1) By adopting the technical scheme, when a fire disaster happens, the temperature of the self-closing valve rises, when the temperature rises to 55 ℃, the memory alloy wire has about 5% shrinkage, and in the process of the memory alloy wire shrinkage, the rotor is driven to rotate, the rotor drives the rotating shaft, and the rotating shaft drives the execution valve to rotate, so that the valve closing operation is finally realized, and the occurrence of secondary accidents can be effectively avoided;

(2) The stop ring is arranged, so that the upward movement of the rotating shaft can be prevented, and the relative positions of the rotating shaft and the execution valve are fixed, so that the reliable transmission of rotation is realized;

(3) When the execution valve is closed, a Hall sensor is arranged above the magnet, and whether the execution valve is closed or not can be confirmed through the Hall sensor;

(4) The magnet frame is provided with the strip-shaped positioning table, and the synchronous rotation of the magnet frame and the rotating body can be realized through the matching of the strip-shaped positioning table and the positioning groove, so that the motion transmission is more reliable and effective;

(5) The line pressing terminal is provided with an external power supply, when the leakage detector detects leakage or the temperature sensor detects abnormal temperature, the external power supply is controlled to be switched on through the control module to heat the memory alloy wire, the memory alloy wire contracts to drive the rotating body to rotate, the operation of closing the valve is realized, and disasters can be effectively avoided in time;

(6) Set up pressure sensor in the top of exit end, can be used for the real-time pressure of monitoring the end of giving vent to anger, when monitoring pressure and being less than the pressure threshold value of settlement, send the suggestion of reporting to the police, can guarantee that the liquefied petroleum gas surplus in the storage tank is enough, avoid causing inconvenience because the surplus is not enough in the use.

Drawings

FIG. 1 is a schematic view of the overall structure of an embodiment of the present invention;

FIG. 2 is a schematic structural diagram of a memory alloy driving device according to an embodiment of the invention;

FIG. 3 is a schematic view of a rotor structure according to an embodiment of the present invention;

FIG. 4 is a schematic view of the open rotor of the present invention showing the manual wrench pointing;

FIG. 5 is a schematic view of the hand wrench pointing in the closed position of the rotor according to the embodiment of the present invention;

fig. 6 is a schematic view of a flow of determining the remaining amount of liquefied gas according to an embodiment of the present invention;

fig. 7 is a schematic diagram illustrating control of an external power supply according to an embodiment of the invention.

The symbols in the figures illustrate:

1. a valve body; 2. a housing; 3. a screw; 4. a magnet; 5. a Hall sensor; 6. a magnet holder; 7. positioning a groove; 8. buckling; 9. a screw; 10. a pressing member; 11. sealing the rubber port; 12. a pressure sensor; 13. a seal ring; 14. a gasket; 15. a tapping screw; 16. a pressure measuring hole; 17. a gasket; 18. an implement valve; 19. a seal ring; 20. a rotating shaft; 21. a baffle ring; 22. a rotating body; 23. a first wrapping post; 24. a first wire pressing terminal; 25. a second winding post; 26. a memory alloy wire; 27. a third wrapping post; 28. a fourth wrapping post; 29. a fifth wrapping post; 30. a sixth wrapping post; 31. a second wire pressing terminal; 32. a manual wrench; 33. an air inlet end; 34. an air outlet end; 35. a boss; 36. a groove; 37. and a winding slot.

Detailed Description

The present invention will be further described with reference to the following examples.

As shown in fig. 1-3, a self-closing valve for liquefied petroleum gas comprises a valve body 1, a housing 2, a valve closing device and a valve opening device, wherein the valve body 1 is provided with an air inlet 33 and an air outlet 34, an execution valve 18 is arranged in the valve body 1, a sealing gasket 17 is arranged between the execution valve 18 and the valve body 1, and through holes in uniform directions are arranged on the execution valve 18 and the sealing gasket 17 to ensure that the air inlet 33 and the air outlet 34 can be communicated when the execution valve 18 is rotated to a certain position. The actuator valve 18 may be a ball valve, a plug valve, a gate valve, or the like that can be closed by rotating 90 °.

The housing 2 is arranged above the valve body 1, and the housing 2 is fixed on the valve body 1 through a screw 3. A rotating body 22 is arranged in the shell 2, the rotating body 22 and the shell 2 can rotate relatively, and a rotating shaft 20 is arranged in the rotating body 22. The rotating shaft 20 is provided with a boss 35, the boss 35 is provided with a groove 36, and the groove 36 is internally provided with a sealing ring 19 to ensure that a sealed cavity is formed in the valve body 1. A baffle ring 21 is arranged between the upper end surface of the boss 35 and the inner end surface of the valve body 1, so that the rotating shaft 20 can be prevented from moving upwards. The lower end of the rotating shaft 20 is fixedly connected with the actuating valve 18, and the rotating body 22 can drive the actuating valve 18 to rotate through the rotating shaft 20 when rotating. Be equipped with trapezoidal buckle 8 on the appearance of rotor 22 upper portion, rotor 22 top is equipped with constant head tank 7, installation magnet frame 6 on the

rotor

22, 6 lower parts of magnet frame are equipped with the blind hole, the blind hole is equipped with bar location platform downwards, bar location platform is installed in constant head tank 7, the size matches with constant head tank 7, be equipped with the recess on the blind hole inner wall, the recess size matches with rotor 22's trapezoidal buckle 8, magnet frame 6 passes through buckle 8 to be installed on rotor 22, realize the synchronous rotation of magnet frame 6 and rotor 22 through the matching of bar location platform and constant head tank 7, the last fixed magnet 4 that is equipped with of magnet frame 6.

Be equipped with wrapping post, memory alloy wire 26 and line ball terminal on the closing valve device, the wrapping post includes wrapping post 23, no. two wrapping posts 25, no. three wrapping posts 27, no. four wrapping posts 28, no. five wrapping posts 29 and No. six wrapping posts 30, and the line ball terminal includes first line ball terminal 24 and second line ball terminal 31, and memory alloy wire 26 can adopt two-way memory alloy wire, also can adopt one-way memory alloy wire, is equipped with wire winding groove 37 on the rotor 22. One end of the memory alloy wire 26 is connected to the first wire pressing terminal 24, and the memory alloy wire 26 sequentially bypasses the first wrapping post 23, the second wrapping post 25 and the third wrapping post 26, and then bypasses the wrapping groove 37 on the rotor 22 to pass through the positioning groove 7 to be wound out from the wrapping groove 37 on the other side of the rotor 22, namely, the memory alloy wire 26 is wound on the rotor 22 in an S shape, and then sequentially bypasses the fourth wrapping post 28, the fifth wrapping post 29 and the sixth wrapping post 30, and is connected to the second wire pressing terminal 31.

When a fire breaks out, the memory alloy wire 26 begins to contract along with the temperature rise, the contraction quantity of the memory alloy wire 26 is about 5%, along with the contraction of the memory alloy wire 26, the memory alloy wire 26 drives the rotating body 22 to rotate, the rotating body 22 drives the rotating shaft 20 to rotate, the rotating shaft 20 drives the execution valve 18 to rotate, and when the execution valve 18 rotates by 90 degrees, the valve can be closed. Rotor 22 drives pivot 20 pivoted in, and rotor 22 still drives the magnet frame 6 of top and rotates, and magnet frame 6 drives magnet 4 and rotates thereupon, and when executive valve 18 closed, be hall sensor 5 directly over magnet 4, through hall sensor 5 response magnet 4, can judge whether execute valve 18 closes, further improves fail safe nature.

The rotating body 22 is provided with a valve opening device, the valve opening device adopts a manual wrench 32, the manual wrench 32 and the rotating body 22 are of an integral structure, and when the valve is closed, the direction of the manual wrench 32 is perpendicular to the central line of the valve body 1. After the fire disaster is over, the rotating body 22 can be driven to rotate by rotating the manual wrench 32, the rotating body 22 drives the rotating shaft 20 to rotate, the rotating shaft 20 drives the execution valve 18 to rotate, the execution valve is rotated to a passage state, the valve is opened, and when the valve is completely opened, the direction of the manual wrench 32 is parallel to the direction of the central line of the valve body 1.

The wire pressing terminal is also connected with a power supply, and after the power supply is switched on, the memory alloy wire 26 can be heated, so that the valve can be automatically closed.

The liquefied petroleum gas self-closing valve can be further provided with an induction box, a leakage detector and a temperature sensor are arranged in the induction box, the leakage detector and the temperature sensor are both connected with the control module, the leakage detector and the temperature sensor can judge whether leakage or high temperature exists or not by monitoring the change of temperature and concentration, when the leakage detector and the temperature sensor monitor that the environmental temperature is abnormal or the leakage exists, the control module can control the switch of an external power supply on the pressure wire terminal to be switched on, the memory alloy wire 26 is heated, the memory alloy wire 26 is changed from martensite to austenite, the rotating body 22 is driven to rotate by 90 degrees, and the automatic closing of the valve is realized.

The specific execution steps of the self-closing valve are as follows:

1) When the temperature of a fire disaster reaches 55 ℃, the memory alloy wire 26 begins to contract, the contraction amount is about 5%, the memory alloy wire 26 pulls the rotor 22 through the positioning groove 7, the rotor 22 drives the rotating shaft 20 and the rotating shaft 20 to drive the execution valve 18 to rotate 90 degrees, the valve closing is realized, at the moment, the magnet 4 on the magnet frame 6 runs right below the Hall sensor 5, and the system identifies the valve closing. After a fire, the manual wrench 32 can be rotated to drive the rotator 22 and the rotating shaft 20 to move, so that the actuating valve 18 is in a closed state and is restored to an open state;

2) When the leakage detector finds leakage, the external power supply supplies power to the memory alloy wire 26, so that the temperature of the memory alloy wire 26 reaches 55 ℃, the memory alloy wire 26 starts to contract, the contraction amount is about 5%, the memory alloy wire 26 pulls the rotating body 22 through the positioning groove 7, the rotating body 22 drives the rotating shaft 20 and the rotating shaft 20 to drive the execution valve 18, the valve closing is realized, at the moment, the magnet 4 on the magnet frame 6 runs to the position right below the Hall sensor 5, and the system identifies the valve closing. After a fire, the rotator 22 and the shaft 20 are rotated by rotating the hand wrench 32, so that the actuator valve 18 is in a closed state and returns to an open state.

A pressure measuring hole 16 is arranged above an air outlet end 34 of the valve body 1, an opening screw 15 is arranged above the pressure measuring hole 16, a pressure sensor 12 is arranged above the opening screw 15, a sealing gasket 14 is arranged above the pressure sensor 12, a pressing part 9 is arranged above the sealing gasket 14, the pressing part 9 is fixed on the shell 2 through a screw 10, a sealing rubber port 11 is arranged on the pressing part 9, a sealing ring 13 is arranged between the pressing part 9 and the shell 2, and a sealing cavity formed inside the self-closing valve can be guaranteed after the sealing rubber is filled. The pressure sensor 12 is used for monitoring the real-time pressure of the gas outlet end 34, predicting the component condition of the liquefied gas, calculating the saturated vapor pressure by using an ampere-dyne formula, monitoring the component change of the liquefied gas by monitoring the change of the saturated vapor pressure, and judging the residual quantity by analyzing the component change condition. The pressure threshold value is preset according to actual use working conditions, so that the residual quantity of the liquefied petroleum gas in the storage tank is enough, and inconvenience caused by insufficient residual quantity of the gas in the use process can be avoided.

By adopting the technical scheme, the valve can be effectively closed in time when a fire disaster occurs, so that the accident expansion is avoided, and the life and property safety of the country and people is guaranteed; when leakage occurs, the valve can be automatically closed, the gas supply can be cut off in time, and accidents are avoided; reminding the user to supplement the liquefied gas in time and avoiding the condition of insufficient gas in the using process.

However, the above description is only an example of the present invention, and the scope of the present invention should not be limited thereto, so that the substitution of the equivalent elements, or the equivalent changes and modifications made according to the claims should be included in the scope of the present invention.

Claims

1. The liquefied petroleum gas self-closing valve is characterized by comprising a valve body, a shell, a valve closing device and a valve opening device, wherein the valve body is provided with an air inlet end and an air outlet end, an execution valve is arranged in the valve body, the shell is fixedly arranged above the valve body, a rotating body is arranged in the shell, a rotating shaft is arranged in the rotating body, the rotating body is fixedly connected with the rotating shaft, the lower end of the rotating shaft is fixedly connected with the execution valve, a positioning groove is formed in the rotating body, a winding post, a memory alloy wire and a wire pressing terminal are arranged on the valve closing device, and the memory alloy wire penetrates through the positioning groove, bypasses the winding post and is fixed on the wire pressing terminal; the liquefied petroleum gas self-closing valve is characterized in that the line pressing terminal is also connected with an external power supply, the liquefied petroleum gas self-closing valve is also provided with a leakage detector and a temperature sensor, the leakage detector and the temperature sensor are both connected with a control module, the control module is connected with the external power supply and used for controlling the on-off of the external power supply, and the control module is used for controlling the on-off of the external power supply on the line pressing terminal to be opened so as to heat the memory alloy wire and realize the automatic closing of the execution valve; and a manual wrench is arranged on the valve opening device and is arranged on the rotating body.

2. A self-closing valve for liquefied petroleum gas according to claim 1, wherein the rotor is provided with a magnet holder, the magnet holder is provided with a magnet, and the magnet holder is detachably fixed on the rotor.

3. The lpg self-closing valve of claim 2, wherein a hall sensor is located above the housing, the hall sensor being located directly above the magnet when the actuator valve is in the closed state.

4. A liquefied petroleum gas self-closing valve according to claim 3, wherein the outer shape of the upper part of the rotating body is provided with a trapezoidal buckle, the lower part of the magnet frame is provided with a blind hole, the inner wall of the blind hole is provided with a groove, and the size of the groove is matched with the trapezoidal buckle of the rotating body; the blind hole is provided with a bar-shaped positioning platform downwards, and the bar-shaped positioning platform is arranged in the positioning groove.

5. The liquefied petroleum gas self-closing valve according to claim 1, wherein a pressure measuring hole is arranged above the gas outlet end of the valve body, a pressure sensor is arranged above the pressure measuring hole, and an alarm device is connected to the pressure sensor.

6. The liquefied petroleum gas self-closing valve according to claim 1, wherein a sealing gasket is arranged between the actuating valve and the valve body, and the actuating valve adopts a valve which can be closed by rotating 90 degrees.

7. The liquefied petroleum gas self-closing valve according to claim 1, wherein the shaft is provided with a boss, the boss is provided with a groove, a sealing ring is arranged in the groove, and a baffle ring is arranged between the upper end surface of the boss and the inner end surface of the valve body.

8. The lpg self-closing valve as claimed in claim 1, wherein the spool comprises a first spool, a second spool, a third spool, a fourth spool, a fifth spool and a sixth spool, the spool terminal comprises a first spool terminal and a second spool terminal, the rotor is provided with a winding slot, one end of the memory alloy wire is connected to the first spool terminal, sequentially bypasses the first spool, the second spool and the third spool, then bypasses the winding slot on the rotor, passes through the positioning slot, then bypasses the winding slot on the other side of the rotor, then sequentially bypasses the fourth spool, the fifth spool and the sixth spool, and then is fixed to the second spool terminal.