Gas safety valve for micro-gas pressure detection

Abstract

The utility model relates to a gas safety valve for micro-pressure detection, which comprises a valve body, a gas inlet and a gas outlet which are positioned at one end of the valve body, and a measuring cavity which is arranged on one side of a control cavity in the valve body and is communicated with the control cavity, a detection unit consisting of a first temperature and pressure sensor and a second temperature and pressure sensor is arranged in the measuring cavity; the first temperature and pressure sensor and the second temperature and pressure sensor are arranged back to back, and the second temperature and pressure sensor is arranged at the end close to the air outlet. The difference between the detected front pressure and temperature data and the back pressure and temperature data is used as the basis of the gas pressure and flow in the valve body, and the rectifying device is arranged, so that the over-pressure, under-pressure and over-current states of pipeline gas can be accurately judged under micro-pressure, and the detection precision is improved.

Description

Technical Field

[0001] This application relates to the field of gas valve technology, specifically to a gas safety valve for micro-pressure detection. Background Technology

[0002] Gas self-closing valves are typically installed on indoor gas pipelines. These valves automatically shut off when there is overpressure, underpressure, or excessive gas flow. Currently, common safety valves on the market use a temperature and pressure sensor within the valve body to detect the pressure entering the valve. While this method can detect overpressure and underpressure conditions, it cannot accurately determine the gas flow state (whether it is flowing and its speed) under low pressure, thus failing to achieve the automatic shut-off function for excessive flow. To address this technical problem, some manufacturers use flow sensors instead of temperature and pressure sensors to detect the flow rate within the valve, and then use the flow rate to determine pressure, such as Chinese Patent 2022104492211. This patent uses a micro-leakage sensor to detect changes in gas flow rate for detection and judgment. However, this method is ineffective against micro-leakage and cannot accurately detect under low pressure conditions to determine whether an underpressure situation has occurred. Summary of the Invention

[0003] In order to overcome the shortcomings of the prior art, the main objective of this utility model is to provide a gas safety valve for micro-pressure detection that can accurately detect the micro-pressure entering the valve body.

[0004] To achieve the above objectives, the present invention adopts the following technical solution: a gas safety valve for micro-pressure detection, comprising a valve body, an inlet and an outlet located at one end of the valve body, and a measuring chamber disposed on one side of the control cavity within the valve body and connected to the control cavity.

[0005] The measuring chamber is equipped with a detection unit consisting of a first temperature and pressure sensor and a second temperature and pressure sensor; the first temperature and pressure sensor and the second temperature and pressure sensor are arranged back to back, and the second temperature and pressure sensor is located at the end near the air outlet.

[0006] Furthermore, the detection unit also includes a fixed connection part, which is fixedly connected to the valve body by mounting bolts. Sensor mounting bases are fixedly connected to both sides of the fixed connection part, and the first temperature and pressure sensor and the second temperature and pressure sensor are respectively fixedly mounted on the sensor mounting bases.

[0007] Furthermore, there is a distance between the first and second temperature and pressure sensors, which are set back to back in the detection unit.

[0008] Furthermore, a rubber pad is provided between the fixed connection part and the valve body.

[0009] Further, the valve body is provided with a rectifying cavity between the control cavity and the measuring cavity, the rectifying cavity is communicated with the measuring cavity, the rectifying cavity is communicated with the control cavity through a connecting channel, the rectifying cavity is provided with a rectifying device, and the gas outlet of the rectifying device is opposite to the detection head of the first temperature and pressure sensor.

[0010] Further, the rectifying device comprises an upper rectifying cover which is sealingly connected with the rectifying cavity in the valve body, a lower rectifying cover which is connected with the upper rectifying cover, an upper channel which is arranged in the middle of the upper rectifying cover and penetrates the upper rectifying cover, a lower channel which is arranged in the middle of the lower rectifying cover and is communicated with the upper channel, an annular channel which is arranged on the outer periphery of the lower channel and is concentric with the lower channel, and an end of the lower channel is opposite to the detection head of the first temperature and pressure sensor.

[0011] The protrusion arranged on the upper rectifying cover is inserted into the annular channel to connect the upper rectifying cover with the lower rectifying cover, the end of the annular channel close to the upper rectifying cover is communicated with the lower channel through a connecting hole, the annular channel is provided with an annular sealing chip which is used for plugging the connecting hole, and the annular sealing chip is connected with the annular channel through a compression spring, and the compression spring pushes the annular sealing chip to plug the connecting hole under the action of a reset force.

[0012] The gas enters into the lower channel through the upper channel, and the gas pressure discharged from the lower channel is detected by the first temperature and pressure sensor; when the gas pressure entering into the lower channel exceeds the set pressure, the gas enters into the connecting hole at this time, the annular sealing chip is pushed to move, the connecting hole is opened, the annular channel is communicated with the lower channel, and the gas enters into the annular channel through the connecting hole and is discharged out of the rectifying device.

[0013] Further, the protrusion arranged on the upper rectifying cover is provided with an annular protrusion, and the inner part of the annular channel in the lower rectifying cover is provided with an annular groove which is matched with the annular protrusion.

[0014] Compared with the prior art, the utility model has the advantages that:

[0015] The utility model discloses a back-to-back setting two temperature and pressure sensors are equipped in the detection cavity of valve body, and the back-to-back setting two temperature and pressure sensors can detect the front gas pressure and temperature and back gas pressure and temperature (namely the detection of dynamic pressure + static pressure and static pressure value of gas) that enter the detection cavity, and the pressure and temperature data of front and the pressure and temperature data of back are used as the judgment basis of the gas flow size in valve body, improve the accuracy of overcurrent judgment, the front end of detection cavity is equipped with the rectifier cavity, and one rectifier device is equipped in the rectifier cavity, and the gas outlet of the device is directly opposite the detection head of first temperature and pressure sensor, and in the case of too low gas pressure, the rectifier device can detect the rectified gas directly opposite the detection head of first temperature and pressure sensor after rectifying the incoming gas, and can gather and detect the gas in valve body in the case of micro pressure, improve the detection precision of gas in the case of micro pressure. BRIEF DESCRIPTION OF DRAWINGS

[0016] Figure 1 It is the cross section structure schematic diagram of gas safety valve for micro pressure detection in the utility model;

[0017] Figure 2 It is the schematic diagram of one embodiment in the utility model;

[0018] Figure 3 It is the structure schematic diagram of detection unit in the embodiment of the utility model;

[0019] Figure 4 It is the structure schematic diagram of rectifier device in the embodiment of the utility model;

[0020] Figure 5 It is the axial view of gas safety valve for micro pressure detection in the embodiment of the utility model;

[0021] Figure 6 It is the schematic diagram of gas detection through detection unit in the embodiment of the utility model. DETAILED DESCRIPTION

[0022] The utility model will be further explained in connection with the drawings and embodiment. Embodiment 1

[0023] As Figure 1 And Figure 5As shown, this embodiment provides a gas safety valve for micro-pressure detection, including a valve body 1, an inlet 101 and an outlet 102 located at one end of the valve body 1, and a measuring chamber 5 disposed on one side of the control chamber 3 inside the valve body 1 and connected to the control chamber 3; the main function of the control chamber 3 is to control the opening and closing of the safety valve; specifically, a connecting channel 8 is provided between the control chamber 3 and the measuring chamber 5, and when controlling the opening and closing of the safety valve, it is only necessary to control the opening degree of the connecting channel 8; in one embodiment, a filter device 20 is also provided in the inlet 101 and the outlet 102 to prevent foreign objects in the gas from entering the valve body 1 and causing damage to the valve body 1;

[0024] A detection unit 6 consisting of a first temperature and pressure sensor 603 and a second temperature and pressure sensor 605 is provided in the measuring chamber 5; the first temperature and pressure sensor 603 and the second temperature and pressure sensor 605 are arranged back to back, and the second temperature and pressure sensor 605 is located at the end near the air outlet 102.

[0025] Specific examples Figure 3 As shown, the detection unit 6 also includes a fixing connection part 601, which is fixedly connected to the valve body 1 by mounting bolts 606. Sensor mounting seats 602 are fixedly connected to both sides of the fixing connection part 601, and the first temperature and pressure sensor 603 and the second temperature and pressure sensor 605 are respectively fixedly mounted on the sensor mounting seats 602. Specifically, during installation, the fixing connection part 601 is sealed and filled into the valve body 1 with polyurethane adhesive while being fixedly connected to the valve body 1 by mounting bolts 606. At the same time, a rubber gasket 604 is provided between the fixing connection part 601 and the valve body 1 for sealing connection. Before the connecting part 601 is installed onto the valve body, the sensor mounting base 602 is fixedly installed on both sides of the fixed connecting part 601. During installation, it can be installed by screws or adhesive. After the sensor mounting base 602 is installed, the first temperature and pressure sensor 603 and the second temperature sensor 605 are fixedly installed on the corresponding sensor mounting base 602. Specifically, they are fixedly installed by screws. The detection heads of the first temperature and pressure sensor 603 and the second temperature and pressure sensor 605 are set opposite to each other to ensure that one temperature and pressure sensor can measure pressure in the forward direction against the direction of gas flow, and the other temperature and pressure sensor can measure pressure in the reverse direction with the direction of gas flow.

[0026] After the installation is completed, the entire fixed connection part 601 is fixed to the installation in the detection cavity, and the detection head of the first temperature and pressure sensor 603 is ensured to face the gas inlet end of the valve body 1, to ensure that the incoming gas forms counterflow with the detection head of the first temperature and pressure sensor 603, to ensure the accuracy of detection, and since the first temperature and pressure sensor 603 faces the gas inlet end of the valve body 1, the detection head of the second temperature and pressure sensor 605 faces the gas outlet end of the valve body, to measure the pressure of the gas flowing downstream; specifically, when the pressure test is performed, as shown in FIG. 6, the valve body 1 is connected to the fixed connection part 601, and the first temperature and pressure sensor 603 and the second temperature and pressure sensor 605 are arranged on the fixed connection part 601. Figure 6As shown, the gas entering the valve body 1 enters the detection cavity from left to right, at this time, the first temperature and pressure sensor 603 opposite the gas inlet detects the gas pressure of the entering gas (at this time, the detected gas pressure is the size of the front pressure), after the first temperature and pressure sensor 603 detects, the gas will turn over the fixed connection part 601 to the gas outlet end of the valve body, at this time, when the gas turns over the fixed connection part 601, the second temperature and pressure sensor 605 provided on the back detects the gas pressure of the turned gas, since the second temperature and pressure sensor is provided on the back, when detecting the gas pressure, the detected pressure is the pressure in the flow direction of the gas; the difference between the first temperature and pressure sensor and the second temperature and pressure sensor is used to detect the gas pressure entering the valve body, which can improve the accuracy of the detection. Specifically, when the flow of gas entering the valve body is relatively large, the pressure detected by the first temperature and pressure sensor is relatively large, and since the second temperature and pressure sensor 605 is provided on the back of the first temperature and pressure sensor 603, due to the excessive flow of gas, the gas will directly move to the outlet of the valve body after turning over the fixed connection part 601, at this time, the second temperature and pressure sensor 605 detects the pneumatic pressure which is extremely small or can be ignored, and the pressure detected by the first temperature and pressure sensor 603 is basically equal to the pressure of the gas; when the flow of gas entering the valve body is too small, at this time, the first temperature and pressure sensor 603 detects the front pressure entering the valve body 1, and when the gas turns over the fixed connection part 601, due to the small flow of gas, the gas will sink down, and the second temperature and pressure sensor 605 will detect the gas pressure of the sinking gas. It can be seen that when evaluating the pressure, the difference between the pressure detected by the first temperature and pressure sensor 603 and the temperature and pressure detected by the second temperature and pressure sensor 605 can be used to feedback the gas pressure when the gas flow is small; it can be seen that the embodiment utilizes gas dynamics, and the smaller the gas flow, the larger the value detected by the second temperature and pressure sensor 605, so that the data obtained by the difference is smaller, which solves the problem that a pressure difference sensor cannot accurately detect the gas pressure in the case of micro pressure (when the micro pressure is small, the internal pressure changes relatively small, and the value detected by a pressure difference sensor is relatively close, which cannot be distinguished, resulting in that the valve cannot be closed in time in the case of excessive flow), and improves the technical feedback in the case of micro pressure.

[0027] In the embodiment, as Figure 1The control cavity 3 is provided with at least a rubber diaphragm 9 for opening or closing the connecting channel 8, which can move up and down in the control cavity to open and close the connecting channel 8, thereby opening and closing the entire safety valve; in order to control the rubber diaphragm 9, a driving device is fixed on the valve body 1, and the driving end of the driving device extends into the valve body 1 and is fixedly connected with the rubber diaphragm 9, and the driving device drives the rubber diaphragm 9 to open or close the connecting channel 8.

[0028] In the specific work, the first temperature and pressure sensor 603 is used to detect the front pressure and temperature data of the gas entering the valve body 1 (i.e. the pressure of the gas in the reverse flow direction), and the second temperature and pressure sensor 605 is used to detect the back pressure and temperature data of the gas entering the valve body 1 (i.e. the pressure of the gas in the forward flow direction after turning over the fixed connection part 601), and the difference between the pressure and temperature values detected by the first temperature and pressure sensor 603 and the pressure and temperature values detected by the second temperature and pressure sensor 605 is used as the basis for the gas flow in the valve body and the flow speed, and according to the set overcurrent and timing values, the driving device controls the rubber diaphragm to close the connecting channel, thereby realizing the overcurrent and timing automatic closing function of the gas safety valve for micro-pressure detection. The difference between the pressure value detected by the second temperature and pressure sensor 605 and the pressure value detected by the first temperature and pressure sensor is the real-time relative pressure of the gas in the valve body, and after temperature compensation, the driving device can accurately control the rubber diaphragm to close the connecting channel, thereby realizing the overpressure and underpressure automatic closing function of the gas safety valve for micro-pressure detection. Embodiment 2

[0029] In order to ensure accurate detection in the micro-pressure state and timely closing of the valve in the underpressure state, a rectifying cavity 4 is further arranged between the control cavity 3 and the measuring cavity 5 in the valve body 1, the rectifying cavity 4 is in communication with the measuring cavity 5, the rectifying cavity 4 is in communication with the control cavity 3 through the connecting channel 8, a rectifying device 7 is arranged in the rectifying cavity 4, and the gas outlet of the rectifying device 7 is opposite to the detection head of the first temperature and pressure sensor 603; the gas entering the rectifying cavity through the connecting channel 8 is rectified by the rectifying device 7 and then detected by the first temperature and pressure sensor 603, and the dispersed gas can be concentrated for detection by the rectifying device in the micro-pressure state, so that the detection data can be improved after concentration, the gas flow data can be detected in the micro-pressure state, and the overcurrent state can be timely fed back during detection.

[0030] In one embodiment, as Figure 4The rectifying device 7 comprises an upper rectifying cover 701 sealingly connected with the inside of the rectifying cavity 4 in the valve body 1, a lower rectifying cover 702 connected with the upper rectifying cover 701, and when installed, the lower rectifying cover 702 is sealingly connected with the inner wall of the rectifying cavity 4, and a sealing ring can be arranged at the connection position to achieve the purpose of sealing connection, the protrusion provided on the upper rectifying cover 701 is inserted into the annular channel 705 provided on the upper rectifying cover 702, the upper channel 708 provided on the upper rectifying cover 701 is communicated with the lower channel 703 provided in the lower rectifying cover 702, the radius of the annular channel 705 in the embodiment is greater than the diameter of the lower channel 703, and after the upper rectifying cover 701 is connected with the lower rectifying cover 702, the center lines of the upper channel 708 and the lower channel 703 are located on the same straight line; at the same time, the connected upper rectifying cover 701 and lower rectifying cover 702 are installed horizontally in the rectifying cavity 4 as shown in Figure 1 , and the end of the lower channel 703 away from the upper channel 708 is opposite to the detection head of the first temperature and pressure sensor 603, so that the gas pressure of the gas after the rectifying device can be detected by the first temperature and pressure sensor 603 in the under-pressure state.

[0031] One or more connection holes 707 are arranged in the end of the annular channel 705 close to the upper rectifying cover 701 and communicated with the lower channel 703, specifically, when the end protrusion of the upper rectifying cover 701 is inserted into one end of the annular channel, a seal is formed with the end of the upper rectifying cover 701, so that the gas in the upper channel 708 needs to enter the annular channel 705 through the connection hole 707, and the end of the lower rectifying cover 702 away from the upper rectifying cover 701 is provided with a gas through hole communicated with the annular channel 705, so that the gas in the annular channel 705 can be discharged through the gas through hole;

[0032] An annular sealing chip 704 is arranged in the annular channel 705 and used for plugging the connection hole 707, and the annular sealing chip 704 is connected with the annular channel 705 through a compression spring 706, the compression spring 706 is arranged on the outer wall of the lower channel 703, i.e. in the annular channel 705, so that the annular sealing chip 704 can be compressed when descending, and when the annular sealing chip 704 is plugged, the compression spring 706 is in a compressed state and pushes the annular sealing chip 704 to plug the connection hole 707 under the action of a reset force; and the compression degree of the compression spring 706 can be adjusted according to a specific pressure threshold.

[0033] Specifically, when the pressure entering the valve body is too small, the gas entering the rectifying cavity is concentrated into the upper channel 708, the pressure value is increased (the pressure value is too small, the sensor cannot detect the degree of pressure change when detecting, affecting the judgment of overcurrent state), and then the lower channel 703 is discharged and detected by the detection head of the first temperature and pressure sensor. This way can increase the pressure value when the pressure is too small, facilitate the detection of the change of the pressure in the valve body, and more accurately judge whether the overcurrent state occurs under the condition of micro pressure; when the pressure is too large, if a large amount of pressure flows into the lower channel, the safety valve pressure loss is too large, and the rated flow is too small. At this time, when the pressure is too large, the gas pressure entering the connecting hole 707 is also increased, and when it is greater than the elastic force of the annular sealing chip 704 pushed by the compression spring, the gas entering the connecting hole 707 pushes the annular sealing chip 704 to move downward at this time. At this time, the connecting hole 707 is opened, and the connecting hole 707 is in communication with the annular channel 705. Then the gas is discharged to the outside of the rectifying device through the annular channel 705. The pressure of the first temperature sensor when detecting is also reduced, which effectively reduces the valve resistance and protects the first temperature sensor. Since the annular channel plays a role in pressure division, it will not affect the detection and judgment of overpressure (for example, the overpressure threshold of the first temperature sensor in this application can be completed without pressure division. The pressure division is set to avoid damage to the first temperature sensor caused by sudden increase of gas pressure). It can be seen that the rectifying device in this embodiment can increase the pressure value under the condition of micro pressure to ensure that the underpressure detection can be completed, and can effectively protect the temperature sensor while effectively reducing the valve resistance under the condition of sudden increase of gas pressure.

[0034] In another embodiment, in order to facilitate the connection of the upper rectifying cover 701 and the lower rectifying cover 702, an annular protruding part 709 is arranged on the protruding part of the upper rectifying cover 701, and an annular groove matched with the annular protruding part 709 is arranged in the inner part of the annular channel 705 of the lower rectifying cover 702. When installing, only need to insert the protruding part of the upper rectifying cover 702 into the annular channel 705, and when the annular protruding part 709 enters the annular groove, the installation is completed. In order to ensure the sealing performance of the upper rectifying cover 701 and the lower rectifying cover 702 after connection, a plurality of sealing rings can be arranged at the connection part of the upper rectifying cover and the lower rectifying cover for sealing connection. Embodiment 3

[0035] On the basis of embodiment 1, as Figure 2 and Figure 4As shown, a base 11 is fixed on the valve body 1, and the base 11 is screw-fixed with the valve body 1, and the driving device is located in the base 11;

[0036] In one embodiment, the driving device can be a driving rod capable of driving the rubber diaphragm 9 to move up and down.

[0037] Alternatively, the driving device at least includes a screw rod 15 rotatably connected to the base 11, the lower part of the screw rod 15 extends into a sliding cavity 21 provided in the base 11, and is threadedly connected with a transmission nut 10 provided in the sliding cavity 21, and the transmission nut 10 is slidably connected with the inner wall of the sliding cavity 21. Specifically, a through hole is provided in the base 11, the screw rod 15 is inserted into the through hole and connected by a shaft spring, so as to ensure the rotation of the screw rod 15. A plurality of sliding grooves are provided on the wall of the sliding cavity 21, and the sliding grooves are arranged in an up-down manner. A sliding block is provided on the transmission nut 10 and matched with the sliding grooves, so as to ensure that the transmission nut 10 can only move up and down in the sliding cavity 21 when matched with the screw rod 15, and cannot rotate relatively. The rubber diaphragm 9 is fixedly installed on the bottom of the transmission nut 10 by vulcanization, and can move up and down by the driving of the transmission nut 10, so as to realize the opening and closing of the connecting channel 8. In one embodiment, the movement distance of the transmission nut 10 in the sliding cavity 21 is the same as the movement distance of the rubber diaphragm, and since the rubber diaphragm 9 is provided on the transmission nut 10, the length of the entire transmission nut 10 is greater than the movement distance of the rubber diaphragm. In another embodiment, a connecting rod is fixedly connected to the bottom of the transmission nut 10, the connecting rod penetrates through the lower wall of the sliding cavity and is fixedly connected with the rubber diaphragm, and the connecting rod is sealed when penetrating through the lower wall of the sliding cavity 21, so as to ensure that the gas cannot enter the sliding cavity.

[0038] In one embodiment, the driving device further includes a driving part provided above the base 11 and used for driving the screw rod 15 to rotate, the driving part can drive the screw rod 15 to rotate, and in the process of rotating the screw rod 15, the transmission nut 10 can move up and down in the sliding cavity 21, and in turn drive the rubber diaphragm 9 to open and close the connecting channel 8.

[0039] Specifically, the driving part includes a driving motor 19 fixedly arranged in the base 11, an output shaft of the driving motor 19 is connected with the speed reduction mechanism 17, the speed reduction mechanism in the embodiment is a micro speed reducer, the speed reducer is a conventional technology in the technical field, and details are not described herein. The driving gear 18 is fixedly installed on the output shaft of the speed reduction mechanism 17. The driving gear 18 is engaged with the intermediate gear 22 rotatably arranged in the base 11. The intermediate gear 22 is fixedly connected with the driving gear 13 on the upper end of the screw rod 15. When arranged, a motor compartment and a battery compartment are arranged in the base 11, and the motor compartment is located on one side of the screw rod 15. The driving motor 19 is fixedly installed in the motor compartment through screws. In order to ensure that the driving gear 18 fixed on the driving motor 19 has enough space, the upper portion of the motor compartment is stepped, which is used for rotation of the driving gear 18. An intermediate gear installation compartment is further arranged between the motor compartment and the screw rod 15. The intermediate gear 22 is rotatably connected with the shaft fixedly arranged in the intermediate gear installation compartment. The intermediate gear installation compartment is in communication with the battery compartment, so that the driving gear 18 can be engaged with the intermediate gear 22. A stepped compartment is further arranged on the upper portion of the screw rod 15. The driving gear 13 is arranged in the stepped compartment and fixedly connected with the screw rod 15. The stepped compartment is in communication with the intermediate gear installation compartment, so that the driving gear 13 can be engaged with the intermediate gear 22. In working, the driving motor 19 drives the driving gear to rotate through the speed reduction mechanism 17. The driving gear 18 drives the driving gear 13 to rotate through the intermediate gear 22, and then drives the screw rod 15 to rotate, so as to drive the transmission nut to move up and down, and realize opening and closing of the connecting channel 8 by the rubber diaphragm 9.

[0040] In one embodiment, a power socket is arranged outside the motor compartment and electrically connected with the driving motor 19. In use, the driving motor 19 is provided with power through an external power source.

[0041] In another embodiment, a PCB compartment is arranged in the base. A PCB board is fixedly connected in the PCB compartment and fixed in the PCB compartment through bolts. A processor is arranged on the PCB board. The input end of the processor is in communication connection with the first temperature and pressure sensor 603 and the second temperature and pressure sensor 605. The output end of the processor is in communication connection with the driving motor 19. The first temperature and pressure sensor 603 and the second temperature and pressure sensor 605 input the detected pressure and temperature values into the processor. The processor compares the received pressure and temperature values with the set overcurrent and timing threshold values after difference. If the difference is greater than the set threshold value, the processor controls the driving motor 19 to drive the screw rod 15 to drive the transmission nut to move downward, and then drive the rubber diaphragm 9 to close the connecting channel. Embodiment 4

[0042] On the basis of embodiment 2, in order to avoid that the valve can also be opened or closed in the state that the driving motor has no power supply, the upper part of the screw rod 15 is fixedly connected with a manual knob 16 for manually driving the screw rod 15 to rotate. Specifically, when being arranged, a knob cavity is arranged above the base, the manual knob 16 is connected with the upper part of the screw rod 15 extending into the cavity in the knob cavity, the screw rod 15 can be driven to rotate through the manual knob 16, and then the opening or closing of the valve is controlled, and meanwhile, a cap is arranged outside the knob cavity, the cap can be threadedly connected at the cavity opening of the knob cavity, when manual control is needed, the cap is removed, and the manual knob is manually rotated to realize control. Embodiment 5

[0043] On the basis of embodiment 1, the first temperature and pressure sensor 603 and the second temperature and pressure sensor 605 arranged back to back in the detection unit 6 have a distance, specifically, the first temperature and pressure sensor 603 and the second temperature and pressure sensor 605 can be arranged back to back in close contact or can be arranged back to back with a certain distance, as long as the pressure of the gas flowing in the reverse direction detected by the first temperature and pressure sensor 603 and the pressure of the gas flowing in the forward direction detected by the second temperature and pressure sensor 605 are ensured.

[0044] The temperature and pressure sensor used in the embodiment can test the temperature of the gas while measuring the pressure, the detected temperature value can be sent to the temperature information of the company or the client port of the user through the wireless sending module, and real-time monitoring is realized; specifically, when being sent, a wireless communication module such as a 5G module can be arranged on the PCB, and the processor receives the detected temperature information and sends it to the client through the 5G module for real-time detection.

[0045] The above embodiments are only illustrative of the present application and do not constitute a limitation on the protection scope of the present application, and any design identical or similar to the present application belongs to the protection scope of the present application.

Claims

1. A gas safety valve for micro-pressure detection, comprising a valve body (1), an air inlet (101) and an air outlet (102) located at one end of the valve body (1), characterized in that, The measuring cavity (5) is arranged on one side of the control cavity (3) in the valve body (1) and communicates with the control cavity (3); The detecting unit (6) is arranged in the measuring cavity (5) and comprises a first temperature and pressure sensor (603) and a second temperature and pressure sensor (605); the first temperature and pressure sensor (603) and the second temperature and pressure sensor (605) are arranged back to back, and the second temperature and pressure sensor (605) is arranged at one end close to the air outlet (102).

2. A gas safety valve for microbarometric detection according to claim 1, characterized in that The detecting unit (6) further comprises a fixed connecting portion (601) fixedly connected in the valve body (1) through a mounting bolt (606); the fixed connecting portion (601) is fixedly connected with sensor mounting seats (602) on both sides; and the first temperature and pressure sensor (603) and the second temperature and pressure sensor (605) are fixedly arranged on the sensor mounting seats (602), respectively.

3. The gas safety valve for microbar detection according to claim 1, wherein The first temperature and pressure sensor (603) and the second temperature and pressure sensor (605) arranged back to back in the detecting unit (6) have a distance therebetween.

4. The gas safety valve for microbar detection according to claim 2, wherein A rubber pad (604) is further arranged between the fixed connecting portion (601) and the valve body (1).

5. The gas safety valve for microbar detection according to claim 1, wherein A rectifying cavity (4) is further arranged between the control cavity (3) and the measuring cavity (5) in the valve body (1); the rectifying cavity (4) communicates with the measuring cavity (5); the rectifying cavity (4) communicates with the control cavity (3) through a connecting channel (8); and a rectifying device (7) is arranged in the rectifying cavity (4), and an air outlet of the rectifying device (7) is opposite to a detection head of the first temperature and pressure sensor (603).

6. A gas safety valve for microbarometric detection according to claim 5, characterized in that The rectifying device (7) comprises an upper rectifying cover (701) sealingly connected with the rectifying cavity (4) in the valve body (1), and a lower rectifying cover (702) connected with the upper rectifying cover (701); a through upper channel (708) is arranged in the middle of the upper rectifying cover (701); a lower channel (703) communicating with the upper channel (708) is arranged in the middle of the lower rectifying cover (702); an annular channel (705) concentric with the lower channel (703) is arranged on the outer periphery of the lower channel (703); and an end of the lower channel (703) is opposite to the detection head of the first temperature and pressure sensor (603). A protrusion arranged on the upper rectifying cover (701) is inserted into the annular channel (705) to connect the upper rectifying cover (701) and the lower rectifying cover (702); an end of the annular channel (705) close to the upper rectifying cover (701) communicates with the lower channel (703) through a connecting hole (707); an annular sealing chip (704) for plugging the connecting hole (707) is arranged in the annular channel (705); the annular sealing chip (704) is connected with the annular channel (705) through a compression spring (706); and the compression spring (706) pushes the annular sealing chip (704) to plug the connecting hole (707) under the action of a reset force. Gas enters into the lower channel (703) through the upper channel (708), and the gas pressure discharged through the lower channel (703) is detected by the first temperature and pressure sensor (603); when the gas pressure entering into the lower channel (703) exceeds the set pressure, the gas enters into the connecting hole (707) at this time, the annular sealing chip (704) is driven to move, the connecting hole (707) is opened, the annular channel (705) is communicated with the lower channel (703), and the gas enters into the annular channel (705) through the connecting hole (707) and is discharged out of the rectifying device (7).

7. A gas safety valve for microbarometric detection according to claim 6, characterized in that The annular protruding portion (709) is arranged on the protruding portion of the upper rectifying cover (701), and the annular channel (705) in the lower rectifying cover (702) is internally provided with an annular groove matched with the annular protruding portion.

Images