TWI737090B - Pressure sensing device of gas appliance - Google Patents

Abstract

The present invention is a pressure sensing device for a gas appliance, which is mainly used to prevent gas leakage and maintain safety when a pressure sensor is installed between a gas channel or two gas valves to detect changes in gas pressure. The device includes a set of shells which are airtightly joined by upper and lower shells, inside which are provided with a circuit board, a pressure sensor and a terminal set, and is characterized in that the shell is provided with a connecting part communicating with the gas channel , The pressure sensor has a detection tube communicating with the connecting portion, and a non-leak ring is arranged between the periphery of the detection tube and the connecting portion; a non-leak gasket is arranged around the abutting edges of the upper and lower shells, The leak-proof gasket allows the outer end of the terminal group to pass through the outer shell and tightly wrap the outer periphery of each terminal to prevent the gas leaking into the shell from escaping in case of leakage, achieving a double leak-proof effect.

Description

Pressure sensing device of gas appliance

The present invention is a pressure sensing device applied to a gas appliance. The technical content is mainly to seal a pressure sensor and a terminal group for transmitting signals in a housing, and at a position where the pressure sensor and the terminal group pass through the housing and communicate with the outside world Separately set up a sealed and leak-proof structure to prevent gas leakage.

The inventor once invented a method for the TWI655384 gas system to automatically detect gas leaks, which is mainly to install a pressure sensing device in the gas passage between the upstream gas valve and the downstream gas valve. After the downstream gas valve is closed in different sequences according to the detection steps, if the gas pressure that should be kept in balance in the gas passage changes, it means that the upstream gas valve or the downstream gas valve may have a gas leak. The measuring device can be judged by detecting the change of gas pressure and notifying the system to give a warning.

In terms of gas pressure sensing technology and applications, MEMS (Micro-Electrical Mechanical Structure) pressure sensors are currently on the market, which mainly integrate electronic, mechanical, optical, chemical, magnetic and other items into one On a single or multiple chips, including sensing, processing or actuation functions, it has the advantages of high performance, low cost, and small size. It has been widely used in different fields, such as water level detection in washing machines or dishwashers. If it is applied to the above-mentioned technical field of detecting gas leaks, it is also an effective way to implement the invention.

Although the above-mentioned MEMS pressure sensor can be applied to gas appliances, the safety standards of gas appliances are very strict and the possibility of gas leakage is strictly prohibited. Therefore, when the sensor is installed in the pressure sensing device, a certain airtightness is required. In order to maintain safety. In addition, the pressure sensing device using the MEMS pressure sensor needs to weld the MEMS pressure sensor on the circuit board, and then transmit the detection signal to the external firepower control system through the terminal group on the circuit board. Therefore, the pressure sensing device A connecting pipe will be set up to communicate with the gas channel to detect the combustion Gas pressure and a perforation is provided to allow the terminal group to pass through and be electrically connected to the external firepower control system, so that the pressure sensing device may leak gas at the position of the detection tube and the perforation.

Therefore, how to provide a sealed and leak-proof structure on a pressure sensing device using a MEMS pressure sensor to prevent gas leakage when the pressure sensing device is installed on a gas appliance and maintain safety is what the present inventor wants to improve The problem.

The object of the present invention is to provide a pressure sensing device installed on a gas appliance, the pressure sensing device is to seal the pressure sensor and the terminal group for transmitting the signal in a shell, and the pressure sensor and the terminal group pass through the shell The positions where the body communicates with the outside world are respectively provided with a sealing and leak-proof structure, thereby achieving a double leak-proof function and maintaining safety.

In order to achieve the above objective, the present invention provides a pressure sensing device for a gas appliance. The pressure sensing device is arranged on the gas passage of the gas appliance and includes a set of shells whose upper and lower shells are airtightly aligned with each other. , The housing is provided with a circuit board, a pressure sensor and a terminal group with multiple terminals respectively arranged on the circuit board, the pressure sensor can detect the gas pressure, and the circuit board and the terminal group The pressure signal output is characterized in that the housing is provided with a connecting portion, the top of the connecting portion has a through hole communicating with the gas passage, the pressure sensor has a detecting tube extending in the connecting portion, and the outer end of the detecting tube In communication with the through hole, the gas pressure from the gas passage can be detected, and a non-leak ring that can prevent gas leakage is provided between the periphery of the detection tube and the connecting portion; and the upper and lower shells A non-leak gasket is arranged around the surrounding aligning edges, and the non-leak gasket is pressed against the aligning edges of the upper and lower shells, so that the upper and lower shells are tightly sealed with each other and the circuit board is sealed in the shell. In addition, the leak-proof gasket is integrally formed with an airtight gasket at a position relative to the terminal group, and the airtight gasket allows the outer end of each terminal of the terminal group to pass through the shell and tightly wrap the outer periphery of each terminal.

With the above structure, the shell is provided with a leak-proof ring at the position where the pressure sensor is connected to the gas passage to prevent gas from entering the shell, and a leak-proof gasket is arranged around the mating edges of the upper and lower shells, The non-leak gasket is integrally molded with an air-tight gasket to tightly cover each end When the outer end of the terminal set passes out of the shell, it can maintain airtightness through the air-tight gasket to further prevent the gas that penetrates into the shell from escaping, achieving a double leak-proof effect.

The following further describes the implementation of each element:

In implementation, the terminal set includes a terminal block arranged inside the housing and used for positioning of a plurality of terminals. The airtight gasket is provided with a plurality of perforations for the outer end of each terminal to pass through. The inner diameter of the perforation is smaller than that of each terminal. Outer diameter, and the inner side of the airtight gasket abuts against the outer side of the terminal block.

In implementation, the thickness of the airtight gasket is greater than the thickness of the leak-proof gasket, and the mating edges of the upper shell and the lower housing are respectively provided with upper and lower positioning grooves that are mutually butted against the airtight gasket.

In implementation, the upper shell or the lower shell is provided with an annular positioning portion for positioning the leak-proof gasket along the inner periphery of the thickness of the mating edge.

In implementation, the outer end of the terminal set is arranged on a socket, and both sides of the socket are respectively provided with a fixed protrusion, and the upper shell or the lower shell is respectively provided with a corresponding connector on the thickness of the mating edge. The fixed protrusion is inserted into the fixed fixed groove.

In implementation, the connecting portion of the shell is a connecting pipe, and the shell is arranged on a mounting seat installed and fixed on the gas passage. The mounting seat has a sleeve set on the periphery of the connecting pipe. The other end far away from the connecting pipe is connected with the gas passage, so that the gas pressure of the gas passage can be detected by the detection pipe of the pressure sensor through the sleeve, the connecting pipe, and the through hole.

During implementation, the connecting pipe of the shell is covered with a diaphragm that can react to the gas pressure, and liquid oil is filled between the inner side of the diaphragm and the connecting portion, so that the gas pressure of the gas channel can pass through the diaphragm and become liquid. The oil is the medium detected by the detection tube of the pressure sensor.

During implementation, a second anti-leak ring capable of preventing gas leakage is arranged between the outer periphery of the connecting pipe of the shell and the inner periphery of the sleeve of the mounting seat.

During implementation, a filter screen capable of filtering gas impurities is provided in the sleeve of the mounting seat.

In implementation, the circuit board is provided with a temperature compensation loop, the temperature compensation loop includes a temperature compensation module that can detect the environment, and a zero point adjustment module, wherein the temperature compensation module can detect the ambient temperature, then the environment The temperature is transmitted to the zero point adjustment module, the zero point The adjustment module can receive the pressure detected by the pressure sensor and the ambient temperature detected by the temperature compensation module, and use the pressure value corresponding to the ambient temperature as the zero point to compensate the pressure detected by the pressure sensor, thereby outputting the correct Pressure value.

Compared with the prior art, the parts where gas leakage may occur on the casing of the present invention include: the connection between the casing and the gas passage, the mating edges of the upper and lower casings, and the position where the terminal passes through the casing, respectively It is equipped with a leak-proof ring, a leak-proof washer, and an air-tight gasket, especially the leak-proof gasket and the air-tight gasket are integrally formed, and the air-tight gasket is tightly wrapped around the outer periphery of each terminal, so that the terminal group can pass through the shell The air-tight function can be maintained through the air-tight gasket to prevent the gas that leaks into the shell from escaping, achieving the double leak-proof effect.

In the following, according to the technical means of the present invention, the implementation manners suitable for the present invention are listed, and the following descriptions are provided in conjunction with the drawings:

100: Pressure sensing device

200: gas appliance

201: Gas Channel

202: Upstream gas valve

203: Downstream gas valve

204: Chamber

10: Shell

11: Upper shell

12: Lower shell

13: Connection Department

131: Convergence

14: Through hole

15: Ring positioning part

16: upper and lower positioning slots

20: circuit board

30: Pressure sensor

31: Detection tube

32: stop ring

40: terminal group

41: Terminal

42: Terminal block

50: Socket

51: fixed bump

52: fixed slot

60: Non-leak washer

61: Air-tight cushion

62: Piercing

70: Mounting seat

71: Casing

72: The second non-leak ring

73: Filter

80: diaphragm

81: Liquid oil

90: Temperature compensation circuit

Figure 1: The three-dimensional appearance of the present invention.

Figure 2: A three-dimensional exploded view of the present invention.

Figure 3: An exploded perspective view of the present invention from another angle.

Figure 4: A cross-sectional view of the structure of the present invention.

Figure 5: A cross-sectional view of the structure of the present invention from another angle

Figure 6: A cross-sectional view of the structure of the second embodiment of the present invention.

Figure 7: A schematic diagram of the position of the present invention installed in the gas channel of a gas water heater.

Figure 8: Schematic diagram of the position of the present invention installed in the gas channel of the gas stove.

Figure ninth: a schematic diagram of the present invention with a temperature compensation circuit.

As shown in Figures 1 to 5, the present invention is a pressure sensing device 100 for a gas appliance, which includes a housing 10 with a circuit board 20 inside the housing 10 and a pressure set on the circuit board 20, respectively. The sensor 30 and a terminal group 40.

The outer shell 10 is composed of an upper shell 11 and a lower shell 12 airtightly aligned with each other. The upper shell 11 or the lower shell 12 is provided with a connecting portion 13 connected to the gas passage of the gas appliance. In the figure, the connecting portion 13 is provided on the upper shell 11, and the connecting portion 13 blocks the Between the gas passage and the inside of the casing 10, the connecting portion 13 is provided with a through hole 14 to make the inside of the casing 10 communicate with the gas passage of the gas appliance.

The pressure sensor 30 is arranged in the housing 10 at a position relative to the connecting portion 13, and the pressure sensor 30 has a detecting tube 31, the outer end of the detecting tube 31 extends into the connecting portion 13 and communicates with the through hole 14 , So that the gas pressure of the gas channel can be detected by the detection tube 31 of the pressure sensor 30 through the through hole 14 of the connecting portion 13, so as to achieve the function of detecting the gas pressure; wherein, the periphery of the detection tube 31 and A non-leak ring 32 is provided between the connecting parts 13 to prevent the gas from leaking into the housing 10.

A non-leak gasket 60 is arranged around the mating edges of the upper and lower shells 11 and 12. 11 and 12 tightly seal the circuit board 20 in the housing 10. In implementation, the upper shell 11 or the lower shell 12 is provided with an annular positioning portion 15 along the inner circumference of the thickness of the mating edge. In the figure, the annular positioning portion 15 is provided on the upper shell 11. The annular positioning portion The shape of 15 corresponds to the non-leak gasket 60, which can be used for positioning the non-leak gasket 60.

In implementation, the terminal group 40 includes a plurality of terminals 41 arranged on the circuit board 20 and a terminal block 42 arranged inside the housing 10 for positioning the plurality of terminals 41. The non-leak gasket 60 is integrally formed with an airtight gasket 61 at a position relative to the terminal set 40. The thickness of the airtight gasket 61 is provided with a plurality of perforations 62, and the plurality of perforations 62 can be used for the outer end of each terminal 41 to penetrate. Then, the gas pressure detected by the pressure sensor 30 is transmitted to the outside of the housing 10 through the circuit board 20 and the terminal set 40.

The inner diameter of the perforation 62 is smaller than the outer diameter of each terminal 41, so that the air-tight gasket 61 can tightly wrap the outer periphery of each terminal 41. , Can be arranged on a socket 50 to facilitate the electrical connection of an external connector (not shown) with the terminal set 40 on the socket 50, thereby transmitting the detection signal to the external firepower control system.

In addition, when the outer end of the terminal set 40 passes through the airtight gasket 61, the inner side of the airtight gasket 61 abuts against the outer side of the terminal block 42 and can seal a plurality of perforations 62 so that the airtight gasket 61 is in After the socket 50 is assembled, it is located between the socket 50 and the terminal block 42.

Furthermore, the thickness of the airtight gasket 61 can be greater than or equal to the thickness of the non-leak gasket 60. In the figure, the thickness of the airtight gasket 61 is greater than the thickness of the non-leak gasket 60, and the upper shell 11 and the lower shell The mating edges of the body 12 are respectively provided with an upper and lower positioning grooves 16 which are mutually matched. The upper and lower positioning grooves 16 can be pressed against the upper and lower sides of the airtight gasket 61, so that the inside of the housing can be kept airtight.

When the socket 50 is implemented, a fixing protrusion 51 is respectively provided on both sides, and the upper shell 11 or the lower shell 12 are respectively provided with a corresponding fixing groove 52 on the thickness of the mating edge. When the 11 or the lower housing 12 are in abutment and sealed, they can be pressed up and down through the fixing groove 52 and clamped on the fixing protrusion 51 to prevent the plug socket 50 from falling off the housing 10.

When the housing 10 is implemented, it can be installed directly between the two gas valves of the gas passage as shown in Figure 8, or it can be installed upstream of the gas passage through a mounting seat 70 as shown in Figure 7. Between the gas valve and the downstream gas valve, it is not ruled out that it is directly installed on the gas pipe during specific implementation. Please also refer to the fourth figure. When the connecting portion 13 of the housing 10 is implemented, it is an adapter tube 131. The mounting seat 70 has a sleeve 71 arranged on the periphery of the adapter tube 131, and is connected to the periphery of the adapter tube 131. A second anti-leak ring 72 is provided between the inner circumference of the sleeve 71; the other end of the sleeve 71 away from the connecting pipe 131 communicates with the gas passage, so that the gas pressure in the gas passage can pass through the sleeve 71 and connect The pipe 131 and the through hole 14 are detected by the detecting pipe 31 of the pressure sensor 30 to achieve the function of detecting the gas pressure.

With the above structure, the housing 10 is provided with a leak-proof ring 32 at the position where the pressure sensor 30 is connected to the gas passage to prevent gas from entering the housing, and surrounds the abutting edges of the upper and lower housings 11, 12 A non-leak gasket 60 is provided, and an air-tight gasket 61 is integrally formed on the non-leak gasket 60 to tightly wrap the outer periphery of each terminal 41, so that the outer end of the terminal set 40 can pass through the air tightly when passing through the housing 10 The cushion 61 is kept airtight to further prevent the gas that has penetrated into the shell from escaping, and achieves a double leak-proof effect.

In addition, the sleeve 71 of the mounting seat 70 is provided with a filter 73, which can filter gas impurities, prevent the detection tube 31 of the pressure sensor 30 from being blocked by impurities, and maintain the accuracy of its pressure sensing.

As shown in Figure 6 again, during implementation, the connecting pipe 131 of the housing 10 is coated with a diaphragm 80 capable of reacting to the gas pressure. The inner side of the diaphragm 80 and the connecting portion 13 are filled with liquid oil 81 to make The gas pressure in the gas channel can pass through the diaphragm 80 and be detected by the detection tube 31 of the pressure sensor 30 using the liquid oil 81 as a medium.

Liquid oil is a relatively stable medium and is not easily affected by temperature to change its volume. It can more accurately reflect the gas pressure and prevent the gas from corroding the pressure sensor 30. Moreover, the liquid oil 81 is also filled between the diaphragm 80 and the connecting portion 13 It can achieve the function of air tightness and further strengthen the leak-proof function.

As shown in the embodiments shown in Figures 7 and 8, the pressure sensing device 100 is set between the two gas valves of the gas passage 201 of the gas appliance 200 as an example. The gas passage 201 is equipped with mutual The upstream gas valve 202 and the downstream gas valve 203 are connected, so that the gas passage 201 forms a chamber 204 between the upstream gas valve 202 and the downstream gas valve 203, and the pressure sensing device 100 is arranged in the chamber 204. Use the pressure sensing device 100 to detect the gas pressure change in the chamber 204 to detect whether the gas valve leaks.

When the user first closes the downstream gas valve 203 and then closes the upstream gas valve 202, theoretically, the upstream end of the upstream gas valve 202 and the gas pressure in the chamber 204 are the same. If the upstream gas valve 202 leaks The gas continues to enter through the upstream gas valve 202 and accumulates in the chamber 204. The pressure sensing device 100 will detect the increase in the gas pressure in the chamber 204, thereby determining that the upstream gas valve 202 is leaking. gas.

When the user closes the upstream gas valve 202 first, and then closes the downstream gas valve 203, theoretically, the downstream end of the downstream gas valve 203 and the gas pressure in the chamber 204 are the same. If the downstream gas valve 203 leaks When the gas in the chamber 204 is continuously released through the downstream gas valve 203, the pressure sensing device will detect that the pressure of the gas in the chamber 204 has decreased, so as to determine that the downstream gas valve 203 is leaking.

Please refer to the ninth figure. It is worth mentioning that because the pressure sensor 30 is more susceptible to the environmental temperature due to the characteristics of the component itself, the pressure detection result may not meet the above practical application of detecting air leakage. Therefore, during implementation, The aforementioned circuit board can be provided with a temperature compensation loop 90 to compensate for the influence of the ambient temperature on the pressure sensor 30. As shown in the figure, the temperature compensation circuit 90 includes a temperature compensation module capable of detecting the environment and a zero point adjustment module. The zero point adjustment module can receive the pressure detected by the pressure sensor 30 and the ambient temperature detected by the temperature compensation module, and use the pressure value corresponding to the ambient temperature as the zero point (reference) to compensate the pressure detected by the pressure sensor 30 Therefore, the correct pressure value is outputted to avoid the error of the pressure sensor 30 due to temperature changes.

The above descriptions and drawings of the embodiments only illustrate the preferred embodiments of the present invention, and are not intended to limit the scope of the present invention. Anything similar to or similar to the purpose, structure, device, and features of the present invention should belong to The patent scope of the present invention.

100 pressure sensing device 11 Upper shell 12 Lower shell 13 Connection Department 131 Convergence 14 through hole 16 Upper and lower positioning slots 20 circuit board 30 Pressure sensor 31 Detection tube 32 O-ring 40 terminal set 41 terminal 42 terminal block 50 socket 51 Fixed bump 52 Fixing slot 60 Non-leak washer 61 Air-tight cushion 70 Mounting seat 71 casing 72 second o-ring 73 Filter

Claims (10)

A pressure sensing device for a gas appliance. The pressure sensing device is arranged on the gas passage of the gas appliance and comprises a set of shells which are airtightly joined by upper and lower shells, and a circuit board is arranged inside the shell , And a pressure sensor and a terminal group with a plurality of terminals respectively arranged on the circuit board, the pressure sensor can detect the gas pressure, and then output a pressure signal through the circuit board and the terminal group, characterized in that: The upper shell of the casing is provided with a connecting portion connected with the gas passage, the connecting portion blocks the gas passage and the inside of the casing, and the connecting portion is provided with a through hole so that the inside of the casing communicates with the gas passage. The pressure sensor is arranged in the housing at a position relative to the connecting portion, and the pressure sensor has a detecting tube extending in the connecting portion, and the outer end of the detecting tube is communicated with the through hole to be able to detect coming from the gas passage A non-leak ring that can prevent gas leakage is provided between the periphery of the detection tube and the connecting part; and a non-leak gasket is arranged around the mating edges of the upper and lower shells. The gasket is pressed against the mating edges of the upper and lower housings, so that the upper and lower housings are tightly sealed to each other and the circuit board is sealed in the housing, and the leak-proof gasket is integrally formed at a position relative to the terminal group. An airtight gasket is provided with a plurality of perforations for the outer end of each terminal to pass through the outer shell. Outside around. The pressure sensing device for a gas appliance according to claim 1, wherein the terminal set includes a terminal block arranged inside the housing and used for positioning of a plurality of terminals, and the inner surface of the airtight gasket abuts against the terminal block Outside. The pressure sensing device for a gas appliance according to claim 1 or 2, wherein the thickness of the airtight gasket is greater than the thickness of the non-leak gasket, and the mating edges of the upper casing and the lower casing are respectively provided with a mutual The upper and lower positioning grooves of the airtight cushion are pressed against each other. The pressure sensing device for a gas appliance according to claim 3, wherein the upper shell or the lower shell is provided with an annular positioning portion for positioning the leak-proof gasket along the inner circumference of the thickness of the opposing side. The pressure sensing device for a gas appliance according to claim 1 or 2, wherein the outer end of the terminal set is arranged on a socket, and two sides of the socket are respectively provided with a fixing protrusion, and the upper shell The body or the lower shell is respectively provided with a fixing groove for the corresponding fixing protrusion to be embedded and fixed on the thickness of the mating edge. The pressure sensing device for a gas appliance according to claim 1 or 2, wherein the connecting portion of the housing is a connecting pipe, and the housing is arranged on a mounting seat fixed to the gas passage, and the mounting The seat has a sleeve set on the periphery of the connecting pipe, and the other end of the sleeve away from the connecting pipe communicates with the gas passage, so that the gas pressure of the gas passage can be controlled by the sleeve, the connecting pipe, and the through hole. Detected by the detection tube of the pressure sensor. The pressure sensing device for a gas appliance according to claim 6, wherein the connecting pipe of the shell is coated with a diaphragm capable of reacting to the gas pressure, and liquid oil is filled between the inner side of the diaphragm and the connecting portion, The gas pressure in the gas channel can pass through the diaphragm and be detected by the detection tube of the pressure sensor using liquid oil as the medium. The pressure sensing device for a gas appliance according to claim 6, wherein a second non-leak ring capable of preventing gas leakage is provided between the outer periphery of the connecting pipe of the housing and the inner periphery of the sleeve of the mounting seat. The pressure sensing device for a gas appliance according to claim 6, wherein a filter screen capable of filtering gas impurities is provided in the sleeve of the mounting seat. The pressure sensing device for a gas appliance according to claim 1, wherein the circuit board is provided with a temperature compensation circuit, and the temperature compensation circuit includes a temperature compensation module capable of detecting the environment, and a zero point adjustment module, Among them, the temperature compensation module can detect the ambient temperature, and then transmit the ambient temperature to the zero point adjustment module. The zero point adjustment module can receive the pressure detected by the pressure sensor and the ambient temperature detected by the temperature compensation module, and use the The pressure value corresponding to the ambient temperature is used as the zero point to compensate the pressure detected by the pressure sensor, so as to output the correct pressure value.

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