Leather film type gas meter with temperature and pressure compensation

Abstract

The utility model discloses a diaphragm type gas meter with temperature and pressure compensation, which relates to the technical field of gas meters, and comprises a gas meter shell, a sensor component and a mounting component, a sampling hole is arranged in the gas meter shell, the sensor component is fixed at the sampling hole through the mounting component, and the sensor component is fixed at the sampling hole through the mounting component. The monitoring end of the sensor assembly is located on the inner side of the sampling hole and used for monitoring the temperature and pressure of fuel gas, the signal end of the sensor assembly is located on the outer side of the sampling hole, electrically connected with a fuel gas meter chip and used for transmitting temperature and pressure values, and the fuel gas meter chip is electrically connected with a fuel gas meter display screen. According to the gas meter, monitored temperature and pressure values are transmitted to the gas meter chip through the sensor assembly, the gas meter chip converts and compensates metering pulse signals collected at the same time, finally, the gas consumption is displayed on a display screen of the gas meter in a standard state, and metering indicating value errors are avoided.

Description

Technical Field

[0001] The utility model relates to the technical field of gas meters, in particular to a diaphragm gas meter with temperature and pressure compensation. Background Technique

[0002] The measurement principle of a diaphragm gas meter: Two diaphragms with exactly the same shape divide a metering cavity with a certain volume into four independent and uniform metering chambers. Due to the pressure difference between adjacent chambers, the diaphragm is driven to reciprocate by the pressure difference. Thus, the inhalation and exhaust of each chamber are completed in a cycle. The rocker arm connected to the diaphragm pushes the upper connecting rod mechanism to convert the cycloidal motion into a circular motion, and drives a decimal counter to record and display the volume of the gas passing through the diaphragm volume, and the trade settlement is based on this.

[0003] We know that when calibrating a diaphragm meter, the national regulations state that it is carried out at a temperature of 20°C ± 2°C and a standard atmospheric pressure of 101325 Pa.

[0004] The indication error of a 1.5 - level diaphragm meter: When the flow rate is qt ≤ q ≤ qmax, it is ±1.5%; when qmin ≤ q < qt, it is ±3%.

[0005] According to the gaseous equation, under the same pressure, for every 10°C drop in temperature, the measurement indication error is - 3.41%. Similarly, for every 10°C rise in temperature, the measurement indication error is 3.41%. Under the same temperature, for every 1000 Pa increase in the pipeline pressure, the actual measurement indication error is - 0.98%, and for every 1000 Pa decrease in the pipeline pressure, the actual measurement indication error is 0.98%. The pressure in urban gas pipelines fluctuates (generally within the range of 5 kPa - 10 kPa under normal conditions).

[0006] China has a vast territory, with large temperature changes in different seasons in the east - west, north - south, spring - summer, and autumn - winter regions. Coupled with the fluctuating pressure in urban gas pipelines, conventional mechanical (or with additional electronic devices) diaphragm meters can no longer reflect the fairness of trade settlement, and it is extremely easy to generate economic disputes between urban gas suppliers and users, bringing additional economic losses to urban gas operators.

[0007] Therefore, there is an urgent need for a diaphragm gas meter with temperature and pressure compensation. Content of the Utility Model

[0008] In view of this, the utility model provides a diaphragm gas meter with temperature and pressure compensation to solve the problems raised in the above - mentioned background technique, and specifically discloses the following content:

[0009] A diaphragm gas meter with temperature and pressure compensation, comprising a gas meter housing, a sensor assembly and a mounting assembly. A sampling hole is provided in the gas meter housing. The sensor assembly is fixed at the sampling hole through the mounting assembly. The monitoring end of the sensor assembly is located inside the sampling hole for monitoring the temperature and pressure of the gas. The signal end of the sensor assembly is located outside the sampling hole and is electrically connected to the gas meter chip for transmitting the temperature and pressure values. The gas meter chip is electrically connected to the gas meter display screen.

[0010] Further, the sensor assembly includes a temperature and pressure sensor, a circuit board and a lead wire. The mounting assembly includes a mounting seat. An installation groove is provided at the inner end of the mounting seat, and a through hole is provided at the outer end. The installation groove communicates with the through hole. The circuit board is fixedly arranged in the installation groove. The inner side of the circuit board is fixedly connected to the temperature and pressure sensor, and the outer side is fixedly connected to the lead wire. The end of the lead wire away from the circuit board penetrates through the through hole and is connected to the gas meter chip. The inner end size of the mounting seat is larger than the aperture of the sampling hole, and the outer end size is adapted to the aperture of the sampling hole. The inner end of the mounting seat is located inside the sampling hole, and the outer end extends outwards from the sampling hole and is fixed at the sampling hole through a nut.

[0011] Further, the end of the temperature and pressure sensor away from the circuit board extends out of the installation groove, and the gaps between the temperature and pressure sensor and the circuit board and the installation groove are filled with epoxy sealant.

[0012] Further, a sealing groove is provided at the position of the mounting seat close to the sampling hole, and a sealing ring is provided in the sealing groove.

[0013] Further, a tapered sealing column adapted to the through hole is sleeved on the lead wire.

[0014] The beneficial effects of the present utility model are as follows:

[0015] In the present utility model, the monitored temperature and pressure values are transmitted to the gas meter chip through the sensor assembly. The gas meter chip converts and compensates the metering pulse signals collected at the same time, and finally displays the gas consumption in the standard state on the gas meter display screen, avoiding metering indication errors; the gaps between the temperature and pressure sensor and the circuit board and the installation groove are filled with epoxy sealant, and a tapered sealing column adapted to the through hole is sleeved on the lead wire, both of which enhance the sealing performance of the sensor assembly and the mounting assembly; a sealing ring is provided in the sealing groove of the mounting seat, enhancing the sealing performance between the mounting assembly and the sampling hole. Description of the Drawings

[0016] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for the description of the embodiments or the prior art. Obviously, the drawings in the following description are only the embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on the provided drawings.

[0017] Figure 1 It is a schematic internal structure diagram of a diaphragm gas meter with temperature and pressure compensation according to the present invention.

[0018] Figure 2 Is Figure 1 The enlarged view of part A in

[0019] Among them, in the figure:

[0020] 1. Gas meter housing; 11. Sampling hole; 2. Temperature and pressure sensor; 3. Circuit board; 31. Lead wire; 4. Mounting seat; 41. Mounting groove; 42. Sealing groove; 43. Through hole; 5. Epoxy sealant; 6. Sealing ring; 7. Conical sealing column; 8. Nut. Detailed implementation manners

[0021] The following clearly and completely describes the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts belong to the scope of protection of the present invention.

[0022] It should be noted that the terms "first", "second", etc. in the description and claims of this application and the above drawings are used to distinguish similar objects, and do not necessarily need to describe a specific order or sequence. It should be understood that such data can be interchanged under appropriate circumstances for the embodiments of this application described here. In addition, the terms "including" and "having" and any variations thereof are intended to cover non-exclusive inclusion. For example, a process, method, system, product, or device that includes a series of steps or components does not necessarily have to be limited to those steps or components clearly listed, but may include other steps or components not clearly listed or inherent to these processes, methods, products, or devices.

[0023] In this application, the orientation or positional relationship indicated by terms such as "upper", "lower", "left", "right", "front", "rear", "top", "bottom", "inner", "outer", "middle", "vertical", "horizontal", "lateral", "longitudinal", etc. is based on the orientation or positional relationship shown in the drawings. These terms are mainly used to better describe this application and its embodiments, and are not used to limit that the indicated device, element or component must have a specific orientation, or be constructed and operated in a specific orientation.

[0024] Moreover, in addition to being used to represent the orientation or positional relationship, some of the above terms may also be used to represent other meanings. For example, the term "upper" may also be used to represent a certain attachment relationship or connection relationship in some cases. For those of ordinary skill in the art, the specific meanings of these terms in this application can be understood according to the specific circumstances.

[0025] In addition, the terms "installed", "set", "provided with", "connected", "linked", "socketed" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral structure; it can be a mechanical connection or an electrical connection; it can be directly connected, or indirectly connected through an intermediate medium, or there is an internal connection between two devices, elements or components. For those of ordinary skill in the art, the specific meanings of the above terms in this application can be understood according to the specific circumstances.

[0026] Referring to the attached Figure 1-2 , the utility model discloses a diaphragm gas meter with temperature and pressure compensation, which includes a gas meter housing 1, a sensor assembly and an installation assembly. A sampling hole 11 is provided in the gas meter housing 1. The sensor assembly is fixed at the sampling hole 11 through the installation assembly. The monitoring end of the sensor assembly is located inside the sampling hole 11 and is used to monitor the temperature and pressure of the gas. The signal end of the sensor assembly is located outside the sampling hole 11 and is electrically connected to the gas meter chip to transmit the temperature and pressure values. The gas meter chip is electrically connected to the gas meter display screen.

[0027] In this embodiment, the monitored temperature and pressure values are transmitted to the gas meter chip through the sensor assembly. The gas meter chip converts and compensates the metering pulse signals collected at the same time, and finally displays the gas consumption in the standard state on the gas meter display screen to avoid metering indication errors.

[0028] The sensor assembly includes a temperature and pressure sensor 2, a circuit board 3, and a lead wire 31. The mounting assembly includes a mounting base 4. The inner end of the mounting base 4 is provided with a mounting groove 41, and the outer end is provided with a through hole 43. The mounting groove 41 communicates with the through hole 43. The circuit board 3 is fixedly arranged in the mounting groove 41. The inner side of the circuit board 3 is fixedly connected to the temperature and pressure sensor 2, and the outer side is fixedly connected to the lead wire 31. One end of the lead wire 31 away from the circuit board 3 penetrates through the through hole 43 and is connected to the gas meter chip. The inner end size of the mounting base 4 is larger than the aperture of the sampling hole 11, and the outer end size is adapted to the aperture of the sampling hole 11. The inner end of the mounting base 4 is located inside the sampling hole 11, and the outer end extends outwards from the sampling hole 11 and is fixed at the sampling hole 11 by a nut 8, which is convenient for installation.

[0029] In this embodiment, the circuit board 3 is a circular circuit board with a diameter The lead wire 31 is a 4-core signal wire, and the nut 8 is an M10 nut.

[0030] One end of the temperature and pressure sensor 2 away from the circuit board 3 extends out of the mounting groove 41. The gaps between the temperature and pressure sensor 2 and the circuit board 3 and the mounting groove 41 are filled with epoxy sealant 5 to improve the sealing performance.

[0031] A sealing groove 42 is provided at the position of the mounting base 4 close to the sampling hole 11, and a sealing ring 6 is provided in the sealing groove 42 to improve the sealing performance between the mounting base 4 and the sampling hole 11.

[0032] A tapered sealing column 7 adapted to the through hole 43 is sleeved on the lead wire 31 to improve the sealing between the lead wire 31 and the through hole 43.

[0033] In this embodiment, both the epoxy sealant 5 and the tapered sealing column 7 are made of modified nitrile rubber.

[0034] Installation process:

[0035] The temperature and pressure sensor 2 is welded to the inner side of the circuit board 3, and the lead wire 31 is welded to the outer side of the circuit board to form a sensor assembly. After passing the test, it is placed in the mounting base 4 and sealed and cured with glue (except for the probe surface of the temperature and pressure sensor 2). The sealing ring 6 is sleeved into the sealing groove 42. The outer end of the mounting base 4 passes through the sampling hole 11. The lead wire 31 is sleeved with a customized tapered sealing column 7, and the tapered sealing column 7 is pressed into the through hole, and then the outer end of the mounting base 4 is locked with an M10 nut.

[0036] When starting to work, the program compiled in the gas meter chip will automatically convert and compensate the measured pulse signals collected within the same time according to the collected temperature and pressure values, and the gas consumption will finally be displayed on the gas meter display screen in the standard state.

[0037] The above are only the preferred embodiments of the present application and are not intended to limit the present application. For those skilled in the art, various changes and modifications can be made to the present application. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included within the protection scope of the present application.

Claims

1. A diaphragm gas meter with temperature and pressure compensation, characterized in that, It includes a gas meter housing (1), a sensor assembly, and a mounting assembly. A sampling hole (11) is provided in the gas meter housing (1). The sensor assembly is fixed at the sampling hole (11) through the mounting assembly. The monitoring end of the sensor assembly is located inside the sampling hole (11) and is used to monitor the temperature and pressure of the gas. The signal end of the sensor assembly is located outside the sampling hole (11) and is electrically connected to the gas meter chip to transmit the temperature and pressure values. The gas meter chip is electrically connected to the gas meter display screen.

2. The diaphragm gas meter with temperature and pressure compensation according to claim 1, characterized in that, The sensor assembly includes a temperature and pressure sensor (2), a circuit board (3), and a lead wire (31). The mounting assembly includes a mounting seat (4). An installation groove (41) is provided at the inner end of the mounting seat (4), and a through hole (43) is provided at the outer end. The installation groove (41) communicates with the through hole (43). The circuit board (3) is fixedly arranged in the installation groove (41). The inner side of the circuit board (3) is fixedly connected to the temperature and pressure sensor (2), and the outer side is fixedly connected to the lead wire (31). One end of the lead wire (31) far from the circuit board (3) penetrates through the through hole (43) and is connected to the gas meter chip. The inner end size of the mounting seat (4) is larger than the aperture of the sampling hole (11), and the outer end size is adapted to the aperture of the sampling hole (11). The inner end of the mounting seat (4) is located inside the sampling hole (11), and the outer end extends outwards from the sampling hole (11) and is fixed at the sampling hole (11) through a nut (8).

3. The diaphragm gas meter with temperature and pressure compensation according to claim 2, characterized in that, One end of the temperature and pressure sensor (2) far from the circuit board (3) extends out of the installation groove (41). The gap between the temperature and pressure sensor (2) and the circuit board (3) and the installation groove (41) is filled with epoxy sealant (5).

4. A diaphragm gas meter with temperature and pressure compensation according to claim 2, characterized in that, A sealing groove (42) is provided at the position of the mounting seat (4) close to the sampling hole (11), and a sealing ring (6) is provided in the sealing groove (42).

5. The diaphragm gas meter with temperature and pressure compensation according to claim 2, wherein A tapered sealing column (7) adapted to the through hole (43) is sleeved on the lead wire (31).

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