Gas meter and gas pipeline system

Abstract

The utility model relates to the technical field of gas flow detection, and discloses a gas meter and a gas pipeline system. The metering module comprises a module air inlet and a module air outlet; the valve comprises a first air inlet and a first air outlet, and the first air outlet is communicated with the main air outlet; the one-way air inlet device is located in the containing cavity, the one-way air inlet device comprises a shell and a one-way air inlet mechanism arranged in the shell, the shell is provided with a second air inlet and a second air outlet, the second air inlet communicates with the module air outlet, and the second air outlet communicates with the first air inlet; the one-way gas inlet mechanism is used for limiting gas from flowing from the second gas outlet to the second gas inlet. When the gas meter works, the one-way gas inlet mechanism can limit gas from flowing from the second gas outlet to the second gas inlet, the gas after backflow is prevented from flowing into the metering module, and the accuracy of gas flow detection of the metering module is guaranteed.

Description

Technical Field

[0001] The utility model relates to the technical field of gas flow detection, in particular to a gas meter and a gas pipeline system. Background Art

[0002] A gas meter is a device used to detect the flow of natural gas. It is connected to a gas pipeline and usually includes a valve and a metering module. With the popularization of natural gas, gas meters are being used more and more.

[0003] However, due to the pressure difference between the inside and outside of the gas pipeline and other reasons, the gas meter in the prior art is prone to gas backflow. If the gas backflows to the metering module, it will seriously affect the accuracy of the metering module in detecting the gas flow.

[0004] Therefore, how to design a gas meter to prevent the gas from flowing back to the metering module, thereby ensuring the accuracy of the metering module's gas flow detection, has become a technical problem that needs to be solved urgently in this field. Utility Model Content

[0005] The purpose of the utility model is to at least solve the technical problem of how to prevent gas from flowing back to the metering module, thereby ensuring the accuracy of the gas flow detection by the metering module. This purpose is achieved through the following technical solutions:

[0006] In the first aspect, the utility model proposes a gas meter, which comprises: a shell, comprising a accommodating cavity, the shell having a total air inlet and a total air outlet connected to the accommodating cavity, both of which are used to connect with the gas pipeline; a metering module, located in the accommodating cavity, the metering module comprising a module air inlet and a module air outlet; a valve, located in the accommodating cavity, the valve comprising a first air inlet and a first air outlet; and a one-way air inlet device, located in the accommodating cavity, the one-way air inlet device comprising a shell and a one-way air inlet mechanism arranged in the cavity of the shell, the shell having a second air inlet and a second air outlet; the module air outlet is connected to the second air inlet, the second air outlet is connected to the first air inlet, and the first air outlet is connected to the total air outlet; the one-way air inlet mechanism is used to limit the gas from flowing from the second air outlet to the second air inlet.

[0007] When this gas meter is working, the valve is opened, and the gas in the gas pipeline flows from the main air inlet into the accommodating cavity, flows from the module air inlet into the metering module, and then flows out from the module air outlet. Then the gas flows into the cavity of the shell from the second air inlet, flows through the one-way air inlet mechanism, and then flows out from the second air outlet. Then the gas flows into the valve from the first air inlet, and then flows out from the first air outlet. Finally, the gas flows into the gas pipeline through the main air outlet. When the phenomenon of gas backflow occurs, due to the existence of the one-way air inlet mechanism, the gas will be restricted from flowing from the second air outlet to the second air inlet, preventing the gas after backflow from flowing into the metering module, thereby ensuring the accuracy of the metering module's detection of gas.

[0008] In some embodiments of the utility model, the one-way air intake mechanism includes: a fixed plate, which separates the cavity of the shell into a first cavity and a second cavity, the second air inlet is connected to the first cavity, the second air outlet is connected to the second cavity, and the fixed plate is provided with an air port; and a blocking member, which is configured to be able to switch between a first state and a second state according to a change in the flow direction of the gas; when the blocking member is in the first state, the blocking member blocks the air port; when the blocking member is in the second state, there is a gap between the blocking member and the air port, and the first cavity is connected to the second cavity through the air port.

[0009] In some embodiments of the present invention, the blocking member is an elastic sheet, the elastic sheet is located in the second cavity, and the one-way air intake mechanism further includes a pressing member, and the elastic sheet is fixed to the fixing plate through the pressing member.

[0010] In some embodiments of the utility model, the clamping piece is provided with a protrusion, the elastic sheet is provided with a first mounting hole for passing the protrusion, the fixing plate is provided with a second mounting hole for snap-fitting with the protrusion, and the elastic sheet is fixed to the fixing plate through the protrusion.

[0011] In some embodiments of the present invention, along the length direction of the elastic sheet, the first mounting hole is located in the middle of the elastic sheet.

[0012] In some embodiments of the present invention, the outer wall of the fixing plate is snap-fitted with the inner wall of the cavity of the shell.

[0013] In some embodiments of the present invention, the one-way air intake mechanism further includes a first sealing ring, which is circumferentially arranged around the outer wall of the fixing plate and is located between the outer wall of the fixing plate and the inner wall of the cavity of the shell.

[0014] In some embodiments of the utility model, the gas meter further includes a cover plate, the shell is provided with an opening, the opening is communicated with the cavity of the shell, and the cover plate is used to block the opening.

[0015] In some embodiments of the present invention, a second sealing ring cooperating with the cover plate is provided at the opening.

[0016] In a second aspect, the utility model provides a gas pipeline system, which includes a gas pipeline and any one of the above-mentioned gas meters.

[0017] The above description is only an overview of the technical solution of the present application. In order to more clearly understand the technical means of the present application, it can be implemented in accordance with the contents of the specification. In order to make the above and other purposes, features and advantages of the present application more obvious and easy to understand, the specific implementation methods of the present application are listed below. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] By reading the detailed description of the preferred embodiment below, various other advantages and benefits will become clear to those of ordinary skill in the art. The accompanying drawings are only used for the purpose of illustrating the preferred embodiment and are not considered to be limiting of the present invention. Moreover, the same reference numerals are used throughout the accompanying drawings to represent the same components. In the accompanying drawings:

[0019] Figure 1 A cross-sectional view of a gas meter provided in an embodiment of the utility model;

[0020] Figure 2 An exploded view of a portion of the structure of a gas meter provided in an embodiment of the utility model;

[0021] Figure 3 A schematic diagram of a gas meter provided by an embodiment of the utility model when the gas flows in a forward direction;

[0022] Figure 4 A schematic diagram of a gas meter provided by an embodiment of the utility model when gas flows in reverse direction;

[0023] Figure 5 This is a structural explosion diagram of the one-way air intake mechanism in the gas meter provided in an embodiment of the utility model.

[0024] The reference numerals are as follows:

[0025] 100. Gas meter;

[0026] 1. Shell; 11. Main air inlet; 12. Main air outlet; 13. Accommodating chamber;

[0027] 2. Metering module; 21. Module air inlet;

[0028] 3. Valve; 31. First air outlet;

[0029] 4. Shell; 41. First cavity; 42. Second cavity; 43. Opening;

[0030] 5. One-way air intake mechanism; 51. Fixing plate; 511. Air vent; 512. Second mounting hole; 52. Blocking piece; 521. Elastic sheet; 5211. First mounting hole; 5212. Sub-sheet; 53. Pressing piece; 531. Protrusion;

[0031] 6. Cover plate. DETAILED DESCRIPTION

[0032] The exemplary embodiments of the present disclosure will be described in more detail below with reference to the accompanying drawings. Although the exemplary embodiments of the present disclosure are shown in the accompanying drawings, it should be understood that the present disclosure can be implemented in various forms and should not be limited by the embodiments described herein. On the contrary, these embodiments are provided in order to enable a more thorough understanding of the present disclosure and to fully convey the scope of the present disclosure to those skilled in the art.

[0033] It should be understood that the terms used herein are only for the purpose of describing specific example embodiments and are not intended to be limiting. Unless the context clearly indicates otherwise, the singular forms "one", "an" and "" as used herein may also be meant to include plural forms. The terms "include", "comprise", "contain", and "have" are inclusive and therefore specify the presence of stated features, steps, operations, elements and / or parts, but do not exclude the presence or addition of one or more other features, steps, operations, elements, parts, and / or combinations thereof. The method steps, processes, and operations described herein are not interpreted as necessarily requiring them to be performed in the specific order described or illustrated, unless the execution order is clearly indicated. It should also be understood that additional or alternative steps may be used.

[0034] Although the terms first, second, third, etc. can be used in the text to describe multiple elements, components, regions, layers and / or sections, these elements, components, regions, layers and / or sections should not be limited by these terms. These terms can only be used to distinguish an element, component, region, layer or section from another region, layer or section. Unless the context clearly indicates, terms such as "first", "second" and other numerical terms do not imply order or sequence when used in the text. Therefore, the first element, component, region, layer or section discussed below can be referred to as the second element, component, region, layer or section without departing from the teaching of the example embodiments.

[0035] For ease of description, spatial relative terms may be used herein to describe the relationship of one element or feature relative to another element or feature as shown in the figure, such as "inside", "outside", "inner side", "outer side", "below", "below", "above", "above", etc. Such spatial relative terms are intended to include different orientations of the device in use or operation in addition to the orientation depicted in the figure. For example, if the device in the figure is turned over, then the elements described as "below other elements or features" or "below other elements or features" will subsequently be oriented as "above other elements or features" or "above other elements or features". Therefore, the example term "below..." can include both upper and lower orientations. The device can be oriented otherwise (rotated 90 degrees or in other directions) and the spatial relative descriptors used in the text are interpreted accordingly.

[0036] Figure 1 A cross-sectional view of a gas meter provided in an embodiment of the utility model; Figure 2 An exploded view of a portion of the structure of a gas meter provided in an embodiment of the utility model; Figure 3 A schematic diagram of a gas meter provided by an embodiment of the utility model when the gas flows in a forward direction; Figure 4 A schematic diagram of a gas meter provided in an embodiment of the utility model when the gas flows in the reverse direction.

[0037] refer to Figures 1 to 4 The utility model embodiment provides a gas meter 100, which includes: a shell 1, including a accommodating cavity 13, the shell 1 has a total air inlet 11 and a total air outlet 12 connected to the accommodating cavity 13; a metering module 2, located in the accommodating cavity 13, the metering module 2 includes a module air inlet 21 and a module air outlet; a valve 3, located in the accommodating cavity 13, the valve 3 includes a first air inlet and a first air outlet 31; and a one-way air inlet device, located in the accommodating cavity, the one-way air inlet device includes a shell 4 and a one-way air inlet mechanism 5 arranged in the cavity of the shell, the shell has a second air inlet and a second air outlet; the module air outlet is connected to the second air inlet, the second air outlet is connected to the first air inlet, and the first air outlet 31 is connected to the total air outlet 12; the one-way air inlet mechanism 5 is used to limit the gas from the second air outlet to flow to the second air inlet.

[0038] Among them, since the shell 1 has a main air inlet 11 connected to the accommodating cavity 13, and the metering module 2 is located in the accommodating cavity 13, it is easy to understand that the gas flowing into the accommodating cavity 13 from the main air inlet 11 will diffuse in the accommodating cavity 13 and then flow into the metering module 2 through the module air inlet 21. While ensuring that the gas can flow into the metering module 2, it also makes the gas flow field more uniform.

[0039] Moreover, the metering module 2 can be an ultrasonic metering module, and along the direction of the total air inlet 11 pointing to the total air outlet 12, the metering module 2, the shell 4 and the valve 3 can be arranged in sequence at intervals to more conveniently achieve the connection between the above-mentioned vents.

[0040] In addition, the first air outlet 31 can be directly opposite to the main air outlet 12, and the extension direction of the first air outlet 31 and the extension direction of the main air outlet 12 are in the same straight line. Figures 1 to 4 shown.

[0041] In this embodiment, when the gas meter 100 is working, the valve 3 is first opened, and the gas in the gas pipeline flows into the accommodating cavity 13 from the main air inlet 11, and the gas diffuses in the accommodating cavity 13 and flows into the metering module 2 from the module air inlet 21, and then flows out from the module air outlet. Then the gas flows into the cavity of the shell 4 from the second air inlet, flows through the one-way air inlet mechanism 5, and then flows out from the second air outlet. Then the gas flows into the valve 3 from the first air inlet, and then flows out from the first air outlet 31. Finally, the gas flows into the gas pipeline through the main air outlet 12. The flow direction of the gas is as follows: Figure 3 Indicated by the arrow.

[0042] When the gas backflow occurs, the one-way air intake mechanism 5 will limit the gas from flowing from the second air outlet to the second air inlet, that is, the backflowing gas cannot flow back to the metering module 2 through the cavity of the shell 4. The flow direction of the gas is as follows: Figure 4 Indicated by the arrow.

[0043] Therefore, the gas meter 100 provided in this embodiment effectively prevents the backflow of gas from flowing into the metering module 2 by installing the shell 4 containing the one-way air intake mechanism 5 between the valve 3 and the metering module 2, and the valve 3 is connected to the main air outlet 12, so as to ensure the detection accuracy of the metering module 2; in addition, there are no other unnecessary structural obstacles between the main air inlet 11 of the shell 1 and the module air inlet 21 of the metering module 2, which effectively ensures the stability of the gas flow field and avoids the occurrence of turbulence such as eddy currents, thereby further ensuring the detection accuracy of the gas by the metering module 2.

[0044] Figure 5 The structural explosion diagram of the one-way air intake mechanism in the gas meter provided by the embodiment of the utility model is shown in FIG. Figure 1 , Figure 2 and Figure 5According to an optional embodiment of the present application, the one-way air intake mechanism 5 includes: a fixing plate 51, the fixing plate 51 divides the cavity of the shell 4 into a first cavity 41 and a second cavity 42, the second air inlet is connected to the first cavity 41, the second air outlet is connected to the second cavity 42, and the fixing plate 51 is provided with an air vent 511; and a blocking member 52, the blocking member 52 is configured to be able to switch between a first state and a second state according to a change in the flow direction of the gas; when the blocking member 52 is in the first state, the blocking member 52 blocks the air vent 511; when the blocking member 52 is in the second state, there is a gap between the blocking member 52 and the air vent 511, and the first cavity 41 and the second cavity 42 are connected through the air vent 511.

[0045] In this embodiment, when the gas meter 100 is not working, the blocking member 52 is in the first state to block the air vent 511. When the gas meter 100 is working, when the gas flows into the cavity of the shell 4 from the second air inlet, the blocking member 52 switches to the second state to allow the first cavity 41 and the second cavity 42 to communicate through the air vent 511, so that the gas can flow from the first cavity 41 to the second cavity 42 after entering the cavity of the shell 4, so that the gas can finally flow into the gas pipeline from the main gas outlet 12.

[0046] If backflow occurs in the gas meter 100, the sealing member 52 will switch to the first state to seal the air vent 511, thereby disconnecting the connection between the first cavity 41 and the second cavity 42 to prevent the backflow of gas from flowing from the second cavity 42 into the first cavity 41 and finally flowing out from the second air inlet, thereby avoiding the backflow of gas from flowing into the metering module 2, so as to ensure the accuracy of the metering module 2 in detecting the gas flow.

[0047] Specifically, the sealing member 52 can be a sealing plate, which can be set in the second cavity 42. One side of the sealing plate can be rotatably connected to the fixed plate 51. When the gas meter 100 is working, after the gas flows into the cavity of the shell 4 from the second air inlet, the gas flow will lift the sealing plate to switch the sealing plate from the first state to the second state, thereby realizing the connection between the first cavity 41 and the second cavity 42.

[0048] If backflow occurs in the gas meter 100, since the sealing plate is arranged in the second cavity 42, the backflowing gas flow cannot lift the sealing plate toward the first cavity 41 under the obstruction of the fixed plate 51. The backflowing gas flow can only keep the sealing plate in the first state, so that the sealing plate blocks the air vent 511, thereby disconnecting the connection between the first cavity 41 and the second cavity 42, and finally preventing the backflowing gas from flowing into the metering module 2, so as to ensure the accuracy of the metering module 2 in detecting the gas flow.

[0049] Or, if Figure 2 and Figure 5As shown, according to an optional embodiment of the present application, the blocking member 52 is an elastic sheet 521 , the elastic sheet 521 is located in the second cavity 42 , and the one-way air intake mechanism 5 also includes a clamping member 53 , and the elastic sheet 521 is fixed to the fixing plate 51 through the clamping member 53 .

[0050] Specifically, the pressing piece 53 is provided with a protrusion 531 , the elastic sheet 521 is provided with a first mounting hole 5211 for passing the protrusion 531 , the fixing plate 51 is provided with a second mounting hole 512 for snap-fitting with the protrusion 531 , and the elastic sheet 521 is fixed to the fixing plate 51 via the protrusion 531 .

[0051] The pressing member 53 may be a pressing plate or a pressing rod, which is not specifically limited and can be determined according to actual working conditions.

[0052] In addition, the clamping member 53 can be selected to have a smaller width structure, so that the elastic sheet 521 can be more easily blown by the gas flow, that is, when the gas flows in the forward direction (that is, the gas meter 100 is working normally, and the gas flows from the second air inlet of the shell 4 to the second air outlet), the compressed part of the elastic sheet 521 occupies a smaller area (because the width of the clamping member 53 is smaller), and the uncompressed part of the elastic sheet 521 can be more easily blown by the gas flow to be lifted up relative to the air vent 511 of the fixed plate 51, thereby more easily realizing the switching of the elastic sheet 521 from the first state to the second state.

[0053] In addition, the elastic sheet may be an elastic diaphragm.

[0054] In this embodiment, the one-way air intake mechanism 5 can be assembled by passing the protrusion 531 on the pressing member 53 through the first mounting hole 5211 on the elastic sheet 521 and fixing the protrusion 531 in the second mounting hole 512 of the fixing plate 51 .

[0055] When the gas meter 100 is working, since the elastic sheet 521 is located in the second cavity 42 and the elastic sheet 521 is pressed against the fixed plate 51 by the pressing piece 53, when the gas flows into the cavity of the shell 4 from the second air inlet, the gas flow will lift up the part of the elastic sheet 521 that is not pressed by the pressing piece 53 to switch the elastic sheet 521 from the first state to the second state, that is, the elastic sheet 521 is blown up by the gas flow so that there is a gap between the elastic sheet 521 and the air vent 511 on the fixed plate 51, so that the first cavity 41 and the second cavity 42 can be connected through the air vent 511.

[0056] If backflow occurs in the gas meter 100, due to the presence of the fixed plate 51, even if the gas flows from the second chamber 42 to the first chamber 41, the elastic sheet 521 will always maintain the first state under the blocking effect of the fixed plate 51, that is, the elastic sheet 521 blocks the air vent 511, thereby preventing the gas from flowing back from the second chamber 42 to the first chamber 41, thereby avoiding the backflow of gas from flowing out from the second air inlet of the shell 4 to the metering module 2, and finally ensuring the accuracy of the gas flow detection by the metering module 2.

[0057] Therefore, the gas meter provided in this embodiment, while being able to ensure the accuracy of the gas flow detection by the metering module 2, also improves the efficiency of disassembly and assembly due to its simple structure and saves costs to a certain extent.

[0058] It should be noted that the reason why the one-way air intake device is arranged between the metering module and the valve is that if the one-way air intake device is directly arranged at the air outlet of the valve, then when the valve is closed, there will be a large pressure difference between the inside and outside of the shell. If the valve is suddenly opened at this time, the one-way air intake mechanism may be damaged due to the excessive instantaneous air pressure. For example, in the present embodiment, the one-way air intake mechanism includes an elastic sheet and a clamping piece. There is a possibility that the elastic sheet and the clamping piece may be broken by the instantaneous increased air pressure. Therefore, in the present embodiment, the one-way air intake device is also arranged between the metering module and the valve to protect the one-way air intake device.

[0059] refer to Figure 5 According to an optional embodiment of the present application, along the length direction of the elastic sheet 521 , the first mounting hole 5211 is located in the middle position of the elastic sheet 521 .

[0060] In this embodiment, since the first mounting hole 5211 is located in the middle position in the length direction of the elastic sheet 521, it is easy to understand that the positions of the protrusion 531 and the second mounting hole 512 must correspond to the position of the first mounting hole 5211, that is, the protrusion 531 presses the elastic sheet 521 against the fixed plate 51 at the middle position in the length direction of the elastic sheet 521.

[0061] In this way, when the gas meter 100 is working, after the gas flows into the cavity of the shell 4 from the second air inlet, the gas airflow will blow the elastic sheet 521, and the elastic sheet will be separated by the clamping piece 53, and will be opened by the gas airflow on both sides of the clamping piece 53, so that the elastic sheet 521 is switched from the first state to the second state, that is, the elastic sheet 521 is blown up by the gas airflow, so that there is a gap between the elastic sheet 521 and the air vent 511 on the fixing plate 51, so that the first cavity 41 and the second cavity 42 can be connected through the air vent 511.

[0062] When there is only one first mounting hole 5211 , the first mounting hole 5211 may be located in the middle of the elastic sheet 521 .

[0063] Or, continue to refer to Figure 2 and Figure 5 According to an optional embodiment of the present application, a plurality of first mounting holes 5211 arranged at intervals are provided on the elastic sheet 521 , and an arrangement direction of the plurality of first mounting holes 5211 is perpendicular to an extension direction of the elastic sheet 521 .

[0064] It is easy to understand that when there are multiple first mounting holes 5211, there are also multiple protrusions 531 and second mounting holes 512, the number of the three is the same, and the multiple first mounting holes 5211, the multiple protrusions 531 and the multiple second mounting holes 512 are arranged in a one-to-one correspondence, such as Figure 5 As shown; it should be noted that, the number of the first mounting holes 5211 is not limited, and this embodiment is only for illustration, and the specific number can be selected according to actual working conditions.

[0065] In this embodiment, the elastic sheet 521 is described as a rectangular sheet: when the arrangement direction of the plurality of first mounting holes 5211 is perpendicular to the extension direction of the elastic sheet 521, it means that the plurality of first mounting holes 5211 are arranged at intervals along the width direction of the elastic sheet 521. The pressing member 53 can also extend along the width direction of the elastic sheet 521. Preferably, the length of the pressing member 53 is the same as the width of the elastic sheet 521, so as to ensure that the entire middle portion of the elastic sheet 521 in the extension direction can be pressed by the pressing member 53.

[0066] In this way, when the gas meter 100 is working, after the gas flows into the cavity of the shell 4 from the second air inlet, the gas flow will blow the elastic sheet 521, and the elastic sheet will be opened by the gas flow on both sides of the pressing member 53 with the pressing member 53 as the dividing line, that is, the elastic sheet 521 is divided into two sub-sheets 5212 by the pressing member 53 along its length direction, and the two sub-sheets 5212 are respectively lifted upward relative to the fixing plate 51 to achieve a gap between the sub-sheet 5212 and the air vent 511, so as to achieve communication between the first cavity 41 and the second cavity 42, as shown in FIG. Figure 3 shown.

[0067] Therefore, the elastic sheet 521 of the gas meter 100 provided in this embodiment can fit more closely with the fixed plate 51 in the middle part in its own length direction under the action of the clamping piece 53, so that when the gas meter 100 is working and the gas flows in the forward direction, the elastic sheet 521 can be lifted up in the form of two sub-sheets 5212 respectively, thereby ensuring the efficiency of the elastic sheet 521 switching from the first state to the second state.

[0068] It should be noted that, for ease of description, this embodiment only takes the elastic sheet 521 as a rectangular sheet for illustration, and the shape of the elastic sheet 521 may be determined according to actual working conditions, such as a circle or an irregular shape, as long as the elastic sheet 521 can block the air vent 511 and can switch between the first state and the second state when the gas flow direction changes, there is no specific limitation.

[0069] According to an optional embodiment of the present application, the outer wall of the fixing plate 51 is snap-fitted with the inner wall of the cavity of the shell 4 .

[0070] In this embodiment, when the one-way air intake mechanism 5 is installed in the cavity of the shell 4, the outer wall of the fixing plate 51 can be integrally snapped onto the inner wall of the cavity of the shell 4, that is, the outer wall contour of the fixing plate 51 is the same as the contour shape of the inner wall of the cavity of the shell 4 and the sizes match each other, and the two are connected by interference fit.

[0071] Therefore, this arrangement is simple to assemble and can ensure the relative stability between the fixing plate 51 and the housing 4 .

[0072] According to an optional embodiment of the present application, the one-way air intake mechanism 5 also includes a first sealing ring, which is circumferentially arranged around the outer wall of the fixed plate 51 and located between the outer wall of the fixed plate 51 and the inner wall of the cavity of the shell 4.

[0073] In the present embodiment, when the one-way air intake mechanism 5 is installed in the cavity of the shell 4, since the outer wall of the fixing plate 51 needs to be integrally clamped to the inner wall of the cavity of the shell 4, the present embodiment arranges a first sealing ring in the circumferential direction of the outer wall of the fixing plate 51 so that the first sealing ring is located between the outer wall of the fixing plate 51 and the inner wall of the cavity of the shell 4.

[0074] Therefore, this arrangement can improve the friction between the outer wall of the fixed plate 51 and the inner wall of the cavity of the shell 4 through the arrangement of the first sealing ring, thereby further ensuring the relative stability of the fixed plate 51 and the shell 4; in addition, the first sealing ring can also perform a good seal between the outer wall of the fixed plate 51 and the inner wall of the cavity of the shell 4, further ensuring that when the gas flows back, the gas will not flow from the second cavity 42 into the first cavity 41, thereby more effectively preventing the gas from flowing back to the metering module 2, so as to more effectively ensure the accuracy of the gas flow detection by the metering module 2.

[0075] refer to Figures 1 to 4 According to an optional embodiment of the present application, the gas meter 100 further includes a cover plate 6 , the shell 4 is provided with an opening 43 , the opening 43 is connected to the cavity of the shell 4 , and the cover plate 6 is used to block the opening 43 .

[0076] In this embodiment, in order to facilitate the assembly of the one-way air intake mechanism 5, an opening 43 is provided at one end of the shell 4. During assembly, the one-way air intake mechanism 5 can be extended into the cavity of the shell 4 through the opening 43 for operation.

[0077] After the assembly is completed, in order to ensure the sealing of the cavity of the shell 4 , the cover plate 6 corresponding to the opening 43 is covered to prevent the gas from leaking from the opening 43 of the shell 4 .

[0078] Therefore, the arrangement of the opening 43 and the cover plate 6 can ensure the sealing of the cavity of the shell 4 while facilitating the assembly of the one-way air intake mechanism 5 .

[0079] According to an optional embodiment of the present application, a second sealing ring cooperating with the cover plate 6 is provided at the opening 43 .

[0080] In the present embodiment, it is easy to understand that in order to further improve the sealing performance of the cavity of the shell 4, a second sealing ring is provided at the opening 43; thus, when the one-way air intake mechanism 5 is assembled, the cover plate 6 can be made to block the opening 43, and the cover plate 6 cooperates with the second sealing ring at the opening 43 to further prevent the gas from leaking from the opening 43 of the shell 4.

[0081] The embodiment of the utility model further provides a gas pipeline system, which includes a gas pipeline and any one of the above-mentioned gas meters 100 .

[0082] In this embodiment, the beneficial effects of the gas pipeline system are the same as those of any of the above-mentioned gas meters 100, which are to prevent the gas from flowing back to the metering module 2, thereby ensuring the accuracy of the metering module 2 in detecting the gas flow, which will not be repeated here.

[0083] The above is only a preferred specific implementation of the utility model, but the protection scope of the utility model is not limited thereto. Any changes or substitutions that can be easily thought of by a person skilled in the art within the technical scope disclosed by the utility model should be included in the protection scope of the utility model. Therefore, the protection scope of the utility model should be based on the protection scope of the claims.

Claims

1. A gas meter, characterized in that: include: A shell, comprising a containing cavity, wherein the shell has a total air inlet and a total air outlet communicated with the containing cavity, wherein the total air inlet and the total air outlet are both used to communicate with a gas pipeline; A metering module is located in the accommodating cavity, and the metering module includes a module air inlet and a module air outlet; a valve, located in the accommodating cavity, the valve comprising a first air inlet and a first air outlet; and A one-way air intake device is located in the accommodating cavity, and the one-way air intake device includes a shell and a one-way air intake mechanism arranged in the cavity of the shell, the shell has a second air inlet and a second air outlet; the module air outlet is connected to the second air inlet, the second air outlet is connected to the first air inlet, and the first air outlet is connected to the total air outlet; the one-way air intake mechanism is used to limit the flow of gas from the second air outlet to the second air inlet.

2. The gas meter according to claim 1, characterized in that: The one-way air intake mechanism comprises: a fixing plate, wherein the fixing plate separates the cavity of the shell into a first cavity and a second cavity, the second air inlet is communicated with the first cavity, the second air outlet is communicated with the second cavity, and the fixing plate is provided with an air vent; and A blocking piece, wherein the blocking piece is configured to be switchable between a first state and a second state according to a change in a flow direction of the gas; when the blocking piece is in the first state, the blocking piece blocks the air vent; when the blocking piece is in the second state, there is a gap between the blocking piece and the air vent, and the first cavity and the second cavity are connected through the air vent.

3. The gas meter according to claim 2, characterized in that: The blocking member is an elastic sheet, and the elastic sheet is located in the second cavity. The one-way air intake mechanism also includes a pressing member, and the elastic sheet is fixed to the fixing plate through the pressing member.

4. The gas meter according to claim 3, characterized in that: The clamping member is provided with a protrusion, the elastic sheet is provided with a first mounting hole for penetrating the protrusion, the fixing plate is provided with a second mounting hole for snap-fitting with the protrusion, and the elastic sheet is fixed to the fixing plate through the protrusion.

5. The gas meter according to claim 4, characterized in that: Along the length direction of the elastic sheet, the first mounting hole is located in the middle of the elastic sheet.

6. The gas meter according to claim 2, characterized in that: The outer wall of the fixing plate is snap-fitted with the inner wall of the cavity of the shell.

7. The gas meter according to claim 6, characterized in that: The one-way air intake mechanism further includes a first sealing ring, which is arranged around the circumference of the outer wall of the fixing plate, and is located between the outer wall of the fixing plate and the inner wall of the cavity of the shell.

8. The gas meter according to any one of claims 1 to 7, characterized in that: The gas meter further comprises a cover plate, the shell is provided with an opening, the opening is communicated with the cavity of the shell, and the cover plate is used for blocking the opening.

9. The gas meter according to claim 8, characterized in that: The opening is provided with a second sealing ring matched with the cover plate.

10. A gas pipeline system, characterized in that: It comprises a gas pipeline and a gas meter as claimed in any one of claims 1 to 9.

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