Ultrasonic gas meter

Abstract

The utility model provides an ultrasonic gas meter, and relates to the technical field of metering equipment. The ultrasonic gas meter comprises a meter shell which is provided with a containing cavity, a gas inlet and a gas outlet, and the gas inlet and the gas outlet are both communicated with the containing cavity; the metering module is arranged in the accommodating cavity; the metering module comprises a module main body and a module circuit board connected to the module main body, the module main body is communicated with the air outlet, and the module circuit board is used for being electrically connected with the main control board; the filter circuit board is arranged in the accommodating cavity; the filter circuit board is used for being electrically connected with the main control board, and the filter circuit board is electrically connected with the meter shell. The ultrasonic gas meter is good in anti-electromagnetic interference performance, high in metering precision and long in service life.

Description

Technical Field

[0001] The present application relates to the technical field of metering equipment, and in particular to an ultrasonic gas meter. Background Art

[0002] With the improvement of living standards, more and more residential houses and commercial places use gas as a daily fuel. Places using gas are usually equipped with gas meters to measure the gas used.

[0003] As an electronic flow meter, the core principle of the ultrasonic gas meter is to detect the uplink and downlink flight transmission waveforms of the ultrasonic transducer, calculate the flight time difference, and then infer the gas flow based on the changes in the flight time difference caused by different media.

[0004] However, as a core component, the ultrasonic transducer generates weak signal characteristics and is easily affected by electromagnetic interference, which can lead to inaccurate meter measurement and even no flow measurement in severe cases. Utility Model Content

[0005] The present application provides an ultrasonic gas meter, which has good anti-electromagnetic interference performance, high measurement accuracy and long service life.

[0006] The present application provides an ultrasonic gas meter, comprising:

[0007] The watch case has a containing cavity and is provided with an air inlet and an air outlet, wherein the air inlet and the air outlet are both connected to the containing cavity;

[0008] The metering module is arranged in the accommodating cavity; the metering module includes a module body and a module circuit board connected to the module body, the module body is connected to the air outlet, and the module circuit board is used to be electrically connected to the main control board;

[0009] The filter circuit board is arranged in the accommodating cavity; the filter circuit board is used to be electrically connected to the main control board, and the filter circuit board is electrically connected to the watch case.

[0010] In a possible implementation manner, the filter circuit board is mounted on the first side wall of the watch case, and the filter circuit board is electrically connected to the first side wall of the watch case.

[0011] In a possible implementation, the first side wall of the watch case faces the main control board, and the filter circuit board is electrically connected to the main control board via contact pins.

[0012] In a possible implementation, the module circuit board is electrically connected to the main control board via a filter circuit board and contact pins.

[0013] In a possible implementation, a grounding post is connected to the watch case, and the filter circuit board is connected to the grounding post via a grounding wire.

[0014] In a possible implementation manner, the ultrasonic gas meter further includes:

[0015] The shielding cover is arranged in the accommodating cavity and surrounds the outer periphery of the metering module, and the shielding cover is electrically insulated from the meter case.

[0016] In a possible implementation manner, the module circuit board is connected to the side wall of the module body, and there is a gap between the module circuit board and the shielding cover.

[0017] In a possible implementation manner, a sealant is attached to the outer surface of the module circuit board, and the shielding cover is bonded to the sealant.

[0018] In a possible implementation manner, the ultrasonic gas meter further includes:

[0019] A valve is disposed in the accommodating cavity and communicated with the air inlet;

[0020] The rectifying member is arranged between the valve and the inlet of the metering module.

[0021] In a possible implementation manner, the ultrasonic gas meter further includes:

[0022] The adapter is connected between the outlet and the air outlet of the metering module.

[0023] The ultrasonic gas meter provided in the present application includes a case, a metering module and a filter circuit board, and the metering module and the filter circuit board are both arranged in a receiving cavity surrounded by the case. The case is provided with an air inlet and an air outlet connected to the receiving cavity, the module body of the metering module is connected to the air outlet, the module circuit board connected to the module body is used for electrical connection with the main control board, and the filter circuit board is also used for electrical connection with the main control board. By electrically connecting the filter circuit board to the case, the interference signal generated on the main control board can be transmitted to the case to eliminate the influence of the interference signal on the metering module, thereby improving the anti-electromagnetic interference performance of the metering module, improving the metering accuracy of the metering module, and extending the service life of the ultrasonic gas meter. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the drawings required for use in the embodiments or the prior art description are briefly introduced below. Obviously, the drawings described below are some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0025] Figure 1 A schematic structural diagram of an ultrasonic gas meter from one perspective provided in an embodiment of the present application;

[0026] Figure 2 for Figure 1 A schematic diagram of the structure of the ultrasonic gas meter from another perspective;

[0027] Figure 3 for Figure 1 Exploded structure diagram of ultrasonic gas meter in;

[0028] Figure 4 The overall structure diagram of the ultrasonic gas meter provided in the embodiment of the present application;

[0029] Figure 5 for Figure 1 A partial cross-sectional view of an ultrasonic gas meter from one perspective;

[0030] Figure 6 for Figure 1 A partial cross-sectional view of the ultrasonic gas meter from another perspective;

[0031] Figure 7a for Figure 1 A schematic diagram of a casing of an ultrasonic gas meter in a state;

[0032] Figure 7b for Figure 1 Schematic diagram of the case of the ultrasonic gas meter in another state.

[0033] Description of reference numerals:

[0034] 100-Ultrasonic gas meter;

[0035] 110-case; 120-valve; 130-metering module; 140-shielding cover; 150-adapter; 160-rectifier; 170-filter circuit board; 180-connecting wire; 190-controller;

[0036] 111-front shell; 112-rear shell; 131-module body; 132-module circuit board; 141-left cover; 142-right cover; 151-first sealing ring; 152-second sealing ring; 153-circlip; 154-clip groove; 155-anti-theft net; 161-rectifier grid; 171-contact pin; 181-conductive ring; 191-housing; 192-main control board;

[0037] 1101-air inlet; 1102-air outlet; 1103-grounding column; 1311-entry hole; 1312-bracket; 1321-sealant; 1911-front cover; 1912-rear cover. DETAILED DESCRIPTION

[0038] As described in the background technology, as the core component of the ultrasonic gas meter, the signal characteristics generated by the ultrasonic transducer are weak and easily affected by electromagnetic interference, which will lead to inaccurate measurement of the ultrasonic gas meter, and even no flow measurement in serious cases.

[0039] In order to improve the anti-electromagnetic interference performance of ultrasonic gas meters, in the related art, a special shielding box is usually designed for the metering module, and the metering module together with the module adapter is installed in the shielding box. The base meter case is provided with an air inlet and an air outlet, and a valve is installed in the case. The air inlet of the valve is connected to the air inlet on the case, and the air outlet of the valve is connected to the air inlet of the shielding box. The air outlet end of the module adapter in the shielding box is connected to the air outlet on the case.

[0040] However, in the related art, the detection data of the metering module is generally analyzed and filtered using software algorithms to improve the anti-interference performance of the ultrasonic gas meter. Due to the randomness and disorder of electromagnetic interference, the filtering algorithm cannot guarantee that while correctly processing the normal operating flow data, it can also correctly identify the interfered data and completely filter it out. Therefore, the anti-interference performance of the metering module is unstable, and the accuracy of the metering module cannot be guaranteed.

[0041] In view of this, an embodiment of the present application provides an ultrasonic gas meter, which includes a case, a metering module and a filter circuit board. The metering module and the filter circuit board are both arranged in a receiving cavity surrounded by the case. The case is provided with an air inlet and an air outlet connected to the receiving cavity. The module body of the metering module is connected to the air outlet. The module circuit board connected to the module body is used for electrical connection with the main control board, and the filter circuit board is also used for electrical connection with the main control board. By electrically connecting the filter circuit board to the case, the interference signal generated on the main control board can be transmitted to the case to eliminate the influence of the interference signal on the metering module, improve the anti-electromagnetic interference performance of the metering module, improve the metering accuracy of the metering module, and extend the service life of the ultrasonic gas meter.

[0042] In order to make the purpose, technical solution and advantages of the embodiments of the present application clearer, the technical solution in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0043] Figure 1 A schematic structural diagram of an ultrasonic gas meter from one perspective provided in an embodiment of the present application. Figure 2 for Figure 1 Another structural diagram of the ultrasonic gas meter in FIG. Figure 1 and Figure 2 As shown, an embodiment of the present application provides an ultrasonic gas meter 100, which is used to measure gas flow. The ultrasonic gas meter 100 includes a case 110, which is an external structural component of the ultrasonic gas meter 100. The case 110 has a receiving cavity, and some functional structural components of the ultrasonic gas meter 100 are installed in the receiving cavity.

[0044] The meter case 110 may include a front case 111 and a rear case 112, the front case 111 and the rear case 112 are butted, for example, the front case 111 and the rear case 112 are butted front and back approximately in the horizontal direction, and the front case 111 and the rear case 112 jointly form a receiving cavity. Exemplarily, a sealing ring (not shown in the figure) may be provided between the front case 111 and the rear case 112, and the sealing ring is used to achieve a sealed connection between the front case 111 and the rear case 112, thereby ensuring the airtightness of the ultrasonic gas meter 100 and improving the measurement accuracy of the ultrasonic gas meter 100.

[0045] The meter case 110 is provided with an air inlet 1101 and an air outlet 1102, both of which are in communication with the containing cavity in the meter case 110. The gas enters the containing cavity of the meter case 110 from the air inlet 1101 on the meter case 110, and then flows out from the air outlet 1102 on the meter case 110. By making the gas flow through the ultrasonic gas meter 100, the flow rate of the gas can be measured during the process of the gas flowing in the containing cavity in the meter case 110.

[0046] The present embodiment does not limit the positions of the air inlet 1101 and the air outlet 1102 on the watch case 110, and can be designed according to the installation space on the front case 111 and the rear case 112. For example, the air inlet 1101 and the air outlet 1102 can both be arranged on the rear case 112 (e.g. Figure 1 and Figure 2 As shown in ), or, the air inlet 1101 and the air outlet 1102 may both be disposed on the front shell 111, or, one of the air inlet 1101 and the air outlet 1102 may be disposed on the front shell 111 and the other may be disposed on the rear shell 112.

[0047] Exemplarily, the air inlet 1101 and the air outlet 1102 can be disposed at the top of the case 110. Figure 1 and Figure 2 As shown in the example, the air inlet 1101 and the air outlet 1102 are both arranged at the top of the rear shell 112. The air inlet 1101 and the air outlet 1102 arranged at the top of the watch case 110 can be close to the two ends of the top of the watch case 110 respectively, so as to reserve a sufficient distance between the air inlet 1101 and the air outlet 1102 to ensure that the gas flow in the watch case 110 flows smoothly and orderly.

[0048] Figure 3 for Figure 1 Exploded diagram of the ultrasonic gas meter in . Figure 3 As shown, the ultrasonic gas meter 100 further includes a valve 120 and a metering module 130, both of which are arranged in a receiving cavity surrounded by the meter case 110. The valve 120 is used to control the on-off of the gas flow path in the receiving cavity of the meter case 110, and further, the supply and disconnection of the gas can be controlled. The metering module 130 is used to measure the gas flow rate flowing through the receiving cavity of the meter case 110.

[0049] The valve 120 may be connected to the air inlet 1101 on the case 110, and the valve is used to control the on and off of the gas flow path in the case 210. The metering module 130 may be arranged between the valve and the air outlet 1102 on the case 210, and the metering module 130 is connected to the air outlet 1102. When the valve is opened, the gas enters the case 210 from the air inlet 1101 on the case 210, passes through the valve, and enters the metering module 130, so that the gas flow rate is measured by the metering module 130. Afterwards, the gas flows out from the air outlet 1102 on the case 210.

[0050] Figure 4 This is the overall structure diagram of the ultrasonic gas meter provided in the embodiment of the present application. Figure 4 As shown, the ultrasonic gas meter 100 generally further includes a controller 190 , which is electrically connected to the metering module 130 and is used to control the operation of the metering module 130 .

[0051] Reference Figure 4 As shown, in some examples, the controller 190 can be assembled to form an independent device, and the controller 190 can include a housing 191 and a main control board 192 disposed in the housing 191. The controller 190 is disposed outside the watch case 110, and the controller 190 is connected to the watch case 110. For example, the housing 191 of the controller 190 and the watch case 110 can be docked in a horizontal direction, that is, the controller 190 and the watch case 110 can be arranged side by side. Exemplarily, the controller 190 can be arranged on the front side of the watch case 110, and the side surface of the controller 190 facing away from the watch case 110 is equivalent to the front of the ultrasonic gas meter 100. The side surface of the controller facing away from the watch case 110 can be provided with components such as a display screen and buttons to meet the needs of human-computer interaction.

[0052] Exemplarily, the housing 191 of the controller 190 may include a front cover 1911 and a rear cover 1912, the front cover 1911 and the rear cover 1912 are connected to each other, and the two together form a receiving cavity, and the main control board 192 is installed in the receiving cavity surrounded by the front cover 1911 and the rear cover 1912. Among them, the rear cover 1912 of the controller 190 can be connected to the front shell 111 of the watch case 110.

[0053] In other examples, the controller may be integrated in the housing 110. For example, a main control board is disposed in the housing 110, and the main control board is connected to the metering module 130 as a controller through a connecting line 180. In this way, the connection between the controller and the metering module 130 is simpler, the overall structure of the ultrasonic gas meter 100 is simpler, and all functional components of the ultrasonic gas meter 100 can be disposed in the housing 110.

[0054] The following description is made by taking the example that the controller 190 is assembled to form an independent device, and the controller 190 includes a housing 191 and a main control board 192 disposed in the housing 191 .

[0055] When the air inlet 1101 and the air outlet 1102 on the watch case 110 are both arranged at the top of the watch case 110, the metering module 130 may extend along the height direction of the watch case 110, or in other words, the axial direction of the metering module 130 may be the same as the height direction of the watch case 110. The metering module 130 is open at both axial ends, the bottom end of the metering module 130 is its inlet, the top end of the metering module 130 is its outlet, and the top end of the metering module 130 is connected to the air outlet 1102 on the watch case 110.

[0056] Continue to refer to Figure 3 The ultrasonic gas meter 100 of this embodiment may further include a shielding cover 140, which is disposed in the accommodating cavity of the meter case 110 and surrounds the periphery of the metering module 130. The shielding cover 140 may be made of metal material, and the shielding cover 140 may form a metal shielding structure for the metering module 130 to provide electromagnetic protection for the metering module 130, reduce or even eliminate the electromagnetic interference of the electromagnetic radiation field on the metering module 130, and improve the metering accuracy of the metering module 130.

[0057] Furthermore, the case 110 is usually made of metal material, and as an external structural member, the case 110 surrounds the periphery of the metering module 130. Therefore, the case 110 can also form a metal shielding structure for the metering module 130, which can provide electromagnetic protection for the metering module 130, reduce or even eliminate the electromagnetic interference of the electromagnetic radiation field on the metering module 130, and improve the metering accuracy of the metering module 130.

[0058] By making the shielding cover 140 and the case 110 electrically insulated, in other words, there can be a gap between the shielding cover 140 and the case 110 so that the two do not touch each other, the shielding cover 140 arranged around the periphery of the metering module 130 and the case 110 as an external structural member form a double-layer shielding structure for the metering module 130, which can achieve all-round protection for the metering module 130 in space and effectively eliminate the electromagnetic interference of the electromagnetic radiation field on the metering module 130.

[0059] Among them, the case 110, as an external structural part, forms a fully surrounding structure for the metering module 130 located inside it, and can provide all-round protection for the metering module 130 in space. The shielding cover 140 arranged around the periphery of the metering module 130 can be designed to surround and shield the metering module 130 as much as possible, and only the inlet of the metering module 130 needs to be exposed so that the gas can smoothly enter and exit the metering module 130. In this way, the shielding cover 140 can form a good shielding effect on the metering module 130, which can enhance the dual protection effect of the case 110 and the shielding cover 140.

[0060] Exemplarily, the shielding cover 140 and the housing 110 can be made of corrosion-resistant metal materials to meet the application environment requirements of the ultrasonic gas meter 100 and ensure the service life of the ultrasonic gas meter 100. For example, the shielding cover 140 and the housing 110 are both made of metal materials such as stainless steel and titanium alloy, or both can be made of chrome plating or nickel plating on the surface of the sheet metal.

[0061] Continue to refer to Figure 3 When the gas outlet 1102 on the case 110 is arranged at the top of the case 110, the metering module 130 extends in the height direction of the case 110, the top of the metering module 130 is its outlet, and the top of the metering module 130 is connected to the gas outlet 1102 at the top of the case 110, the shielding cover 140 can be designed as a cylindrical structure, and the shielding cover 140 can extend in the height direction of the case 110. The upper and lower ends of the shielding cover 140 are open, so that the shielding cover 140 can be set outside the metering module 130, and the inlet at the bottom of the metering module 130 is exposed outside the shielding cover 140, so that the gas can smoothly enter and exit the metering module 130.

[0062] As an implementation mode, the shielding cover 140 may include a left cover body 141 and a right cover body 142, and the left cover body 141 and the right cover body 142 are connected to each other to form a cylindrical shielding cover 140. When installing the shielding cover 140, one of the left cover body 141 and the right cover body 142 may be connected to the outer periphery of the metering module 130 first, and then the other may be connected thereto to assemble the shielding cover 140 as a whole. In this way, it is convenient to surround the shielding cover 140 outside the metering module 130, which is also conducive to reducing the processing difficulty of the shielding cover 140, reducing the manufacturing cost of the shielding cover 140, and further reducing the overall cost of the ultrasonic gas meter 100.

[0063] In other embodiments, the shielding cover 140 may also be an integrated structure. In this case, the shielding cover 140 and the metering module 130 may be assembled together before the metering module 130 is installed in the accommodating cavity of the watch case 110, and then the metering module 130 and the shielding cover 140 are integrally installed in the watch case 110. The following description is based on an example in which the shielding cover 140 includes a left cover body 141 and a right cover body 142 connected to each other.

[0064] Continue to refer to Figure 3 As shown, in this embodiment, the metering module 130 can be connected to the gas outlet 1102 on the case 110 through the adapter 150. That is to say, the ultrasonic gas meter 100 can also include an adapter 150, which is arranged in the accommodating cavity of the case 110, and the adapter 150 is connected between the outlet of the metering module 130 and the gas outlet 1102 on the case 110. By designing the structure of the adapter 150, the two ends of the adapter 150 can be matched with the outlet of the metering module 130 and the gas outlet 1102 on the case 110, respectively, and the two ends of the adapter 150 are respectively connected with the metering module 130 and the gas outlet 1102 on the case 110, so as to realize the connection of the metering module 130 to the gas outlet 1102 of the case 110.

[0065] In some embodiments, the metering module 130 and the adapter 150, and the metering module 130 and the air outlet 1102 on the case 110 can be connected to each other in sequence. For example, the outer diameter of the adapter 150 can be relatively small, and the metering module 130 and the air outlet 1102 on the case 110 can be respectively sleeved on the outside of the two ends of the adapter 150. Alternatively, the outer diameter of the adapter 150 can be relatively large, and the two ends of the adapter 150 can be respectively sleeved on the outside of the metering module 130 and the air outlet 1102 on the case 110. Alternatively, the outer diameters of the outlet of the metering module 130, the adapter 150, and the air outlet 1102 on the case 110 are successively increased or decreased, and the three are sleeved in sequence.

[0066] Among them, a first sealing ring 151 may be provided between the adapter 150 and the metering module 130, and the adapter 150 and the metering module 130 are both in close contact with the first sealing ring 151 to achieve a sealed connection between the adapter 150 and the metering module 130. Similarly, a second sealing ring 152 may be provided between the adapter 150 and the air outlet 1102 on the watch case 110, and the adapter 150 and the air outlet 1102 on the watch case 110 are both in close contact with the second sealing ring 152 to achieve a sealed connection between the adapter 150 and the air outlet 1102 on the watch case 110.

[0067] In this way, the adapter 150 and the metering module 130, and the adapter 150 and the gas outlet 1102 on the case 110 are all sealed and connected, which can ensure the sealing performance between the metering module 130 and the gas outlet 1102 of the case 110. It is ensured that there is no gas leakage at the connection parts between the adapter 150 and the metering module 130, and between the adapter 150 and the gas outlet 1102 on the case 110, and it is ensured that the gas flow in the accommodating cavity of the case 110 flows to the gas outlet 1102 on the case 110 through the metering module 130, thereby improving the accuracy of the gas flow measured by the metering module 130 and improving the metering accuracy of the metering module 130.

[0068] On the basis of the sealed connection between the metering module 130 and the adapter 150 through the first sealing ring 151, in order to improve the reliability of the connection between the metering module 130 and the adapter 150, the present embodiment is further provided with a retaining spring 153, and the retaining spring 153 is connected between the metering module 130 and the adapter 150. The retaining spring 153 limits the displacement of the metering module 130 and the adapter 150, so that the connection between the metering module 130 and the adapter 150 is stable and reliable.

[0069] Exemplarily, the clamping spring 153 can be inserted between the metering module 130 and the adapter 150 from the outside of both the metering module 130 and the adapter 150 to limit the metering module 130 and the adapter 150. Taking the metering module 130 as an example, the clamping spring 153 can be inserted between the metering module 130 and the adapter 150 from the outside of the metering module 130, and the clamping spring 153 elastically abuts between the metering module 130 and the adapter 150. Through the elastic force of the clamping spring 153 and the abutment and limitation between the metering module 130 and the adapter 150, the metering module 130 and the adapter 150 are stably and reliably connected.

[0070] For example, a penetration hole 1311 may be provided on the side wall of the metering module 130, and a clamping groove 154 may be provided on the outer side wall of the adapter 150, and the clamping groove 154 of the adapter 150 corresponds to the penetration hole 1311 of the metering module 130. The clamping spring 153 may pass through the penetration hole 1311 on the side wall of the metering module 130 from the outside of the metering module 130, and be inserted between the metering module 130 and the adapter 150, and the clamping spring 153 may be clamped into the clamping groove 154 on the outer side wall of the adapter 150, and the metering module 130 and the adapter 150 are both elastically abutted against the clamping spring 153.

[0071] Continue to refer to Figure 3In some examples, an anti-theft net 155 may be provided in the air outlet 1102 on the adapter 150 or the meter case 110, and the anti-theft net 155 covers the cross section of the adapter 150 or the air outlet 1102. On the one hand, the mesh holes distributed on the anti-theft net 155 can make the gas flow in the adapter 150 flow out of the meter case 110 smoothly, without hindering the flow of the gas flow, thus meeting the working requirements of the ultrasonic gas meter 100. On the other hand, under the obstruction of the anti-theft net 155, human hands or tools cannot reach into the metering module 130, which can prevent artificial damage to the metering module 130, avoid the metering module 130 from causing a decrease in accuracy or even failure to measure correctly, and ensure the working safety of the metering module 130.

[0072] Figure 3 In the example, the anti-theft net 155 is arranged on the adapter 150, and the anti-theft net 155 is specifically arranged at one end of the adapter 150 facing the air outlet 1102 on the watch case 110. In this way, the anti-theft net 155 is located at the end of the adapter 150, which facilitates the installation of the anti-theft net 155 on the adapter 150. At the same time, there is a certain distance between the anti-theft net 155 and the end surface of the air outlet 1102 on the watch case 110, which can prevent the anti-theft net 155 from being damaged by human beings.

[0073] Continue to refer to Figure 3 As shown, the ultrasonic gas meter 100 of this embodiment may further include a rectifying member 160 , which is disposed in the accommodating cavity of the meter housing 110 and is located between the outlet of the valve 120 and the inlet of the metering module 130 .

[0074] By arranging the rectifying member 160 in the meter housing 110 and arranging the rectifying member 160 between the valve 120 and the inlet of the metering module 130, the gas flow will first pass through the rectifying member 160 after the gas flow flows out of the valve 120 and before it flows into the metering module 130. The rectifying member 160 can rectify the gas flow to enhance the uniformity of the gas flow, so that the uniformity of the gas flow entering the metering module 130 is better. In addition, the accuracy of the gas flow measured by the metering module 130 is improved, and the metering precision of the metering module 130 is improved.

[0075] The rectifying member 160 has a rectifying grid 161, and the rectifying grid 161 separates a plurality of uniformly and densely distributed airflow channels on the rectifying member 160. When the gas flow passes through the rectifying member 160, it will be divided by the plurality of airflow channels, which can break up the relatively turbulent flow field and make the gas flow flow out uniformly from each airflow channel, thereby enhancing the uniformity of the gas flow and improving the accuracy of the metering module 130 in measuring the gas flow.

[0076] Figure 5 for Figure 1A partial cross-sectional view of an ultrasonic gas meter from one perspective. Figure 3 and Figure 5 As shown, the metering module 130 may include a module body 131 and a module circuit board 132, wherein the module body 131 is the main structure of the metering module 130, and the module circuit board 132 is connected to the module body 131. The module circuit board 132 is used to be electrically connected to the aforementioned main control board 192, so as to realize signal transmission between the main control board 192 and the module circuit board 132, and then, the working state of the metering module 130 is controlled by the controller.

[0077] The module circuit board 132 is connected to the main control board 192 via a signal line, and the signal line connects the main control board 192 and the part of the module circuit board 132 that needs to transmit the control signal. In addition, the main control board 192 may also include a reference ground terminal, and the module circuit board 132 may include a ground terminal, and the ground terminal of the module circuit board 132 is electrically connected to the reference ground terminal of the main control board 192 to achieve signal grounding of the module circuit board 132.

[0078] In the metering module 130 of this embodiment, the module circuit board 132 can be connected to the side wall of the module body 131. For the metering module 130 extending in the height direction of the meter case 110, the surface area of ​​the side wall of the metering module 130 is large, which is convenient for the installation of the module circuit board 132. In addition, the module circuit board 132 located on the side wall of the module body 131 avoids the inlet of the module body 131, does not affect the gas flow in and out of the metering module 130, and can ensure that the metering module 130 works stably and reliably.

[0079] Exemplarily, a bracket 1312 may be provided on a side wall of the module body 131 . The bracket 1312 may be integrally formed on the module body 131 , for example. The module circuit board 132 may be supported and fixed on the bracket 1312 .

[0080] At this time, the module circuit board 132 corresponds to the shielding cover 140 arranged around the outer periphery of the metering module 130, and the module circuit board 132 is close to the inner side wall of the shielding cover 140. For example, the board surface of the module circuit board 132 can extend along the axial direction of the shielding cover 140. There should be a gap between the module circuit board 132 and the shielding cover 140 to prevent the module circuit board 132 from contacting the shielding cover 140, so as to prevent the shielding cover 140 from affecting the working performance of the module circuit board 132 and ensure the stability and reliability of the module circuit board 132.

[0081] Among them, since the module circuit board 132 is used in the ultrasonic gas meter 100, the module circuit board 132 works in a harsh environment for a long time. Corrosive gases such as hydrogen sulfide exist in the environment, which can easily corrode and break the components and connectors on the module circuit board 132, thereby causing the module circuit board 132 to be open or short-circuited, causing the module circuit board 132 to fail to work normally.

[0082] In this regard, refer to Figure 5 As shown, in this embodiment, the outer surface of the module circuit board 132 may be attached with a sealant 1321, or the sealant 1321 covers the outer surface of the module circuit board 132. By covering the outer surface of the module circuit board 132 with the sealant 1321, the sealant 1321 can seal and protect the module circuit board 132, prevent the influence of the external environment on the module circuit board 132, ensure that the module circuit board 132 will not be broken or short-circuited, so as to ensure the working stability and reliability of the module circuit board 132 and extend the service life of the module circuit board 132.

[0083] Specifically, after the metering module 130 and the shielding cover 140 are assembled, the sealant 1321 can be poured on the surface of the module circuit board 132 by pouring. Under the interference and support of the shielding cover 140, it can be ensured that the sealant 1321 can stably cover the surface of the module circuit board 132. At this time, the sealant 1321 is also attached to the inner wall of the shielding cover 140, and the shielding cover 140 can be fixed to the outer periphery of the metering module 130 through the bonding effect of the sealant 1321.

[0084] Of course, on the basis of bonding the shielding cover 140 with the sealant 1321, the shielding cover 140 can also be fixedly connected to the metering module 130 or the adapter 150 in other ways to improve the stability and reliability of the shielding cover 140. For example, the shielding cover 140 can be locked on the metering module 130 or the adapter 150 by means of locking members such as screws and bolts, or the shielding cover 140 can be snap-connected or threadedly connected to the metering module 130 or the adapter 150.

[0085] Figure 6 for Figure 1 A partial cross-sectional view of the ultrasonic gas meter from another perspective. Figure 6 As shown, the ultrasonic gas meter 100 of this embodiment further includes a filter circuit board 170, which is electrically connected to the reference ground terminal of the main control board 192, and the filter circuit board 170 is electrically connected to the meter case 110. The filter circuit board 170 and the meter case 110 may be connected via a connecting wire.

[0086] By setting the filter circuit board 170 to be electrically connected between the reference ground terminal of the main control board 192 and the watch case 110, the filter circuit board 170 and the watch case 110 are grounded and connected. The interference signal generated on the main control board 192 can be transmitted to the watch case 110 through the filter circuit board 170. This can reduce or even avoid the electromagnetic interference of the interference signal on the module circuit board 132 of the metering module 130, enhance the stability of the module circuit board 132, and improve the metering accuracy of the metering module 130.

[0087] The filter circuit board 170 may include a reference ground portion, a filter circuit, and a protection ground portion (the reference ground portion, the filter circuit, and the protection ground portion are not shown in the figure), and the reference ground portion and the protection ground portion of the filter circuit board 170 may be electrically isolated, and the two are connected through the filter circuit. For example, the reference ground portion and the protection ground portion may be arranged on both sides of the filter circuit board 170, and the filter circuit is arranged between the reference ground portion and the protection ground portion.

[0088] By first connecting the ground terminal on the module circuit board 132 of the metering module 130 to the reference ground terminal of the main control board 192, the reference ground terminal of the main control board 192 is connected to the reference ground part of the filter circuit board 170, and then connected to the protection ground part of the filter circuit board 170 through the filter circuit, and finally connected to the case 110. In this way, a limited flow loop can be provided for the interference signal generated on the main control board 192.

[0089] The interference signal generated on the main control board 192 is conducted to the case 110 by the filter circuit board 170 along the limited flow loop. Since the case 110 (whether the front case 111 or the rear case 112) is generally a metal body with a large surface area, the equivalent impedance of the case 110 is very low, and the introduction of the interference signal will not cause a large voltage change. Therefore, the reference signal of the ground terminal of the metering module 130 will also become very stable, thereby improving the working stability of the metering module 130 and improving the metering accuracy of the metering module 130.

[0090] like Figure 6 As shown, in this embodiment, the filter circuit board 170 can be arranged in the accommodating cavity of the watch case 110, for example, the filter circuit board 170 is mounted on the inner wall of the watch case 110. In other embodiments, the filter circuit board 170 can also be arranged outside the watch case 110, for example, the filter circuit board 170 can be mounted on the outer wall of the watch case 110.

[0091] The following description is made by taking the filter circuit board 170 being disposed in the accommodating cavity of the watch case 110 as an example.

[0092] Reference Figure 6As shown, the filter circuit board 170 can be installed on the first side wall of the watch case 110, and the filter circuit board 170 can also be electrically connected to the first side wall of the watch case 110. In this way, the length of the connecting line between the filter circuit board 170 and the watch case 110 is shorter, which can improve the effect of filtering interference signals by the filter circuit board 170 and enhance the stability of the metering module. In addition, the shorter the connecting line, the shorter its hanging length and the better the connection reliability, which is conducive to improving the stability and reliability of the electrical connection between the filter circuit board 170 and the watch case 110.

[0093] As a specific implementation, the first side wall of the watch case 110 may face the main control board 192, or in other words, the first side wall of the watch case 110 may be a side wall of the watch case 110 facing the main control board 192. As mentioned above, when the controller is located at the front side of the watch case 110, that is, when the main control board 192 is located at the front side of the watch case 110, the first side wall of the watch case 110 may be located on the front case 111.

[0094] At this time, the filter circuit board 170 is arranged close to the main control board 192, which facilitates the electrical connection between the filter circuit board 170 and the reference ground terminal of the main control board 192. Since the filter circuit board 170 and the main control board 192 are separated by the front shell of the watch case 110 and the outer shell of the controller, it is not convenient for the filter circuit board 170 to be connected to the main control board 192. In this regard, a contact pin 171 can also be arranged on the main control board 192 or the filter circuit board 170, and the contact pin 171 is used to realize the electrical contact between the main control board 192 and the filter circuit board 170. With this arrangement, the electrical connection between the filter circuit board 170 and the main control board 192 is more flexible, which facilitates the assembly and disassembly of the controller and the watch case 110.

[0095] Of course, the filter circuit board 170 and the main control board 192 can also be electrically connected by connecting wires. Wire holes can be provided on the front shell 111 and the shell of the controller, so that the connecting wires pass through the front shell 111 and the shell of the controller in turn to electrically connect the filter circuit board 170 and the main control board 192.

[0096] In addition, refer to Figure 6 As shown, in this embodiment, the filter circuit board 170 can also be used to realize the electrical connection between the module circuit board 132 of the metering module 130 and the main control board 192. In other words, the filter circuit board 170 can be used as an electrical channel to electrically connect the module circuit board 132 to the main control board 192.

[0097] Specifically, the module circuit board 132 can be electrically connected to the main control board 192 through the filter circuit board 170 and the contact pins 171. The module circuit board 132 and the filter circuit board 170 can be connected through a connecting wire.

[0098] In this way, there is no need to set up other additional electrical connection structures between the module circuit board 132 and the main control board 192, and the electrical connection between the module circuit board 132 and the main control board 192 is simpler, which helps to reduce the production cost of the ultrasonic gas meter 100. In addition, the electrical connection between the module circuit board 132 and the main control board 192 is more flexible, which facilitates the assembly and disassembly of the controller and the meter case 110. Figure 7a for Figure 1 Schematic diagram of the case of the ultrasonic gas meter in one state. Figure 7b for Figure 1 Schematic diagram of the ultrasonic gas meter case in another state. Figure 7a and Figure 7b As shown, a grounding post 1103 may be connected to the watch case 110. Taking the filter circuit board 170 disposed in the accommodating cavity of the watch case 110 as an example, the grounding post 1103 may be connected to the inner wall of the watch case 110. The filter circuit board 170 may be electrically connected to the grounding post 1103 via a connecting wire 180 to achieve grounding conduction between the filter circuit board 170 and the watch case 110.

[0099] Reference Figure 7a As shown, the filter circuit board 170 is electrically connected to the connecting wire 180 of the watch case 110, one end of the connecting wire 180 is connected to the filter circuit board 170, and the other end of the connecting wire 180 may be connected to a conductive ring 181. Figure 7b As shown, by sleeve-mounting the conductive ring 181 at the end of the connecting wire 180 on the grounding post 1103 of the watch case 110 , the conductive ring 181 is in conductive contact with the grounding post 1103 , so as to achieve grounding connection between the filter circuit board 170 and the watch case 110 .

[0100] In summary, the ultrasonic gas meter 100 provided in this embodiment, on the one hand, provides a shielding cover 140 around the outer periphery of the metering module 130, so that the shielding cover 140 is electrically insulated from the meter housing 110. The shielding cover 140 and the meter housing 110 work together to form a double-layer shielding protection for the metering module 130. The metering module 130 can be protected in all directions in space, and the electromagnetic interference of the electromagnetic radiation field on the metering module 130 can be effectively eliminated.

[0101] On the other hand, by installing the filter circuit board 170 in the watch case 110, the filter circuit board 170 is electrically connected to the reference ground terminal of the main control board 192, and the filter circuit board 170 is electrically connected to the watch case 110. The filter circuit board 170 realizes the ground connection between the main control board 192 and the watch case 110, and can transmit the interference signal generated on the main control board 192 to the watch case 110, so as to avoid the interference signal from affecting the module circuit board 132, so as to improve the working stability of the module circuit board 132.

[0102] Such a configuration can not only ensure that the metering module 130 is not subject to electromagnetic interference from the electromagnetic radiation field in space, but also conduct the interference signal on the module circuit board 132 of the metering module 130 to the watch case 110. Further, it is ensured that the metering module 130 is not affected by electromagnetic interference in all directions, the working stability of the metering module 130 is enhanced, and the metering accuracy of the metering module 130 is improved.

[0103] In the description of the present application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present application.

[0104] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit it. Although the present application has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present application.

Claims

1. An ultrasonic gas meter, characterized in that: include: A watch case having a containing cavity and being provided with an air inlet and an air outlet, wherein the air inlet and the air outlet are both communicated with the containing cavity; A metering module is arranged in the accommodating cavity; the metering module comprises a module body and a module circuit board connected to the module body, the module body is communicated with the air outlet, and the module circuit board is used to be electrically connected to the main control board; A filter circuit board is arranged in the accommodating cavity; the filter circuit board is used to be electrically connected to the main control board, and the filter circuit board is electrically connected to the watch case.

2. The ultrasonic gas meter according to claim 1, characterized in that: The filter circuit board is installed on the first side wall of the watch case, and the filter circuit board is electrically connected to the first side wall of the watch case.

3. The ultrasonic gas meter according to claim 2, characterized in that: The first side wall of the watch case faces the main control board, and the filter circuit board is electrically connected to the main control board via contact pins.

4. The ultrasonic gas meter according to claim 3, characterized in that: The module circuit board is electrically connected to the main control board through the filter circuit board and the contact pins.

5. The ultrasonic gas meter according to any one of claims 1 to 4, characterized in that: The watch case is connected with a grounding post, and the filter circuit board is connected to the grounding post via a grounding wire.

6. The ultrasonic gas meter according to any one of claims 1 to 4, characterized in that: Also includes: A shielding cover is arranged in the accommodating cavity and surrounds the outer periphery of the metering module, and the shielding cover is electrically insulated from the casing.

7. The ultrasonic gas meter according to claim 6, characterized in that: The module circuit board is connected to the side wall of the module body, and a gap is provided between the module circuit board and the shielding cover.

8. The ultrasonic gas meter according to claim 7, characterized in that: The outer surface of the module circuit board is adhered with sealant, and the shielding cover is bonded to the sealant.

9. The ultrasonic gas meter according to any one of claims 1 to 4, characterized in that: Also includes: a valve, disposed in the accommodating chamber and communicated with the air inlet; A rectifying member is arranged between the valve and the inlet of the metering module.

10. The ultrasonic gas meter according to any one of claims 1 to 4, characterized in that: Also includes: An adapter is connected between the outlet of the metering module and the air outlet.

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