metering instrument

Abstract

The application discloses a metering instrument, which comprises a housing assembly and a valve assembly. The housing assembly defines a mounting cavity and has an annular positioning structure in the mounting cavity. The valve assembly is arranged in the mounting cavity and has a valve port, at least part of the valve port is embedded in the annular positioning structure, and the outer edge of the valve port is provided with a chamfer. The metering instrument can improve the mounting precision of the valve assembly relative to the housing assembly.

Description

Technical Field

[0001] This application relates to the field of gas flow measurement, and more particularly to a metering instrument. Background Technology

[0002] Ultrasonic gas meters are metering devices that use ultrasonic technology to measure gas flow. They offer high accuracy, precisely capturing even minute flow rates, and have a wide measurement range, making them suitable for various gas usage scenarios, including residential and commercial applications.

[0003] Low installation accuracy between the casing and valve assembly of an ultrasonic gas meter leads to poor sealing between them, resulting in gas leakage and affecting the measurement accuracy. Therefore, the installation accuracy of the valve assembly relative to the casing can affect the measurement accuracy of the ultrasonic gas meter. It is evident that improving the installation accuracy of the valve assembly relative to the casing is an important research direction. Utility Model Content

[0004] The purpose of this application is to at least solve the problem of improving the installation accuracy of the valve assembly relative to the housing. This purpose is achieved by the following means: This application discloses a metering instrument including a housing assembly and a valve assembly. The housing assembly defines a mounting cavity and has an annular positioning structure located within the mounting cavity. The valve assembly is disposed within the mounting cavity and has a valve port, at least a portion of which is embedded within the annular positioning structure, and the outer edge of the valve port is chamfered.

[0005] The metering instrument of this application utilizes a chamfered corner to guide the valve port into the annular positioning structure as it approaches the structure. This corrects any misalignment between the valve port and the annular positioning structure, achieving positional alignment. The chamfered corner ensures smooth entry of the valve port into the annular positioning structure. Even with any misalignment along the inward or outward direction of the valve port, the annular positioning structure maintains contact with the valve port for mutual guidance. In summary, this mutual guidance between the valve port and the annular positioning structure reduces misalignment, maintaining high installation accuracy and consequently improving the installation accuracy between the valve assembly and the housing assembly.

[0006] In some embodiments, the housing assembly includes a first housing, the first housing including a first main body portion, a stepped portion and the annular positioning structure, the annular positioning structure being connected to the first main body portion, the stepped portion being connected to the first main body portion, the stepped portion being located within the annular positioning structure along the radial direction of the annular positioning structure, and the stepped portion being disposed opposite to the valve port along the axial direction of the annular positioning structure to limit the valve port.

[0007] In some embodiments, the first housing further includes a connector disposed on the stepped portion, the connector being located on the side of the stepped portion opposite to the positioning structure, and the connector, the stepped portion, and the valve port communicating with each other.

[0008] In some embodiments, the first housing further includes a first mounting edge connected to the first body portion, and the housing assembly further includes a second housing, the second housing including a second body portion and a second mounting edge connected to the second body portion, the first body portion and the second body portion defining the mounting cavity, the first mounting edge and the second mounting edge being shaped to fit together and connected to each other.

[0009] In some embodiments, the metering instrument further includes a rectifier plate disposed within the mounting cavity, the rectifier plate defining a rectification space between itself and the first main body, the first main body having an air inlet, the rectifier plate having a rectification hole, the rectification space communicating with the air inlet and the mounting cavity through the rectification hole, the metering instrument further including a metering module having protrusions, the protrusions corresponding to at least a portion of the rectification holes, and at least a portion of the protrusions being located within the rectification holes.

[0010] In some embodiments, the second housing further includes a plurality of first mounting ribs disposed on the second main body portion. The first mounting ribs include first abutting portions and second abutting portions connected to each other. The first abutting portions are located on the side of the metering module away from the first housing and abut against the metering module. The metering module is located between the second abutting portion of at least one first mounting rib and the second abutting portion of at least another first mounting rib, and abuts against the second abutting portion of each first mounting rib.

[0011] In some embodiments, the second housing further includes a plurality of second mounting ribs disposed on the second main body portion. The plurality of second mounting ribs are arranged sequentially along the circumference of the valve assembly. Each second mounting rib includes a third abutment portion and a fourth abutment portion connected to each other. The third abutment portion is located on the side of the valve assembly opposite to the first housing and abuts against the metering module. The valve assembly is located between the fourth abutment portions of the plurality of second mounting ribs and abuts against the fourth abutment portion of each second mounting rib.

[0012] In some embodiments, the second mounting edge is provided with a plurality of thickened portions, each of which is provided with a threaded hole; the second main body is provided with a plurality of grooves, each of which corresponds to one of the plurality of thickened portions, and the shape of each groove is adapted to the outer contour of the corresponding thickened portion; some of the plurality of grooves are provided on the first outer peripheral surface of the second main body, and another portion of the plurality of grooves are provided on the second outer peripheral surface of the second main body, the first outer peripheral surface and the second outer peripheral surface being opposite to each other; the measuring instrument further includes a dial assembly, the dial assembly being mounted on the first outer peripheral surface and covering the grooves located on the first outer peripheral surface; and / or, The inner edge of the annular positioning structure opposite to the first main body is chamfered.

[0013] In some embodiments, along the axial direction of the annular positioning structure, the first mounting edge and the annular positioning structure are located on the same side of the first main body, and the annular positioning structure is located between the first main body and the first mounting edge; or, along the axial direction of the annular positioning structure, the first mounting edge and the annular positioning structure are located on the same side of the first main body, a portion of the annular positioning structure is located on the side of the first mounting edge closer to the first main body, and another portion of the annular positioning structure is located on the side of the first mounting edge away from the first main body.

[0014] In some embodiments, the inner radius of the annular positioning structure is a, and the outer radius of the valve port is b, wherein 0.2mm≤ab≤0.6mm; and / or, the height h of the annular positioning structure satisfies: 5mm≤h≤10mm. Attached Figure Description

[0015] Various other advantages and benefits will become apparent to those skilled in the art upon reading the following detailed description of preferred embodiments. The accompanying drawings are for illustrative purposes only and are not intended to limit the scope of this application. Furthermore, the same reference numerals denote the same parts throughout the drawings. Wherein: Figure 1 This is an exploded view of the metering instrument according to an embodiment of this application; Figure 2 This is a half-sectional view of the metering instrument in an embodiment of this application; Figure 3 for Figure 2 A partial schematic diagram of the measuring instruments in the diagram; Figure 4 This is a schematic diagram of the metering module according to an embodiment of this application; Figure 5 This is a schematic diagram of the second housing according to an embodiment of this application; Figure 6 This is a half-sectional view of the second housing according to an embodiment of this application; Figure 7 for Figure 6 Enlarged view of point A in the middle; Figure 8 for Figure 6 Enlarged view of point B in the middle; Figure 9 This is a schematic diagram of the rectifier aperture according to an embodiment of this application; Figure 10 This is a schematic diagram of the first housing according to an embodiment of this application; Figure 11 for Figure 10 A cross-sectional view of the first housing at CC.

[0016] The labels in the attached diagram are as follows: 100. Measuring instruments; 10. Housing assembly; 11. First housing; 111. First main body; 112. First mounting edge; 113. Annular positioning structure; 114. Air inlet; 115. Mounting cavity; 116. Air outlet; 117. Stepped portion; 118. Connecting pipe; 12. Second housing; 121. Second main body; 122. Second mounting edge; 123. First mounting rib; 1231. First abutting portion; 1232. Second abutting portion; 1233. First side rib; 124. Second mounting rib; 1241. Third abutting portion; 1242. Fourth abutting portion; 1243. Second side rib; 125. Thickened portion; 126. Groove; 13. First sealing ring; 20. Valve assembly; 21. Valve port; 22. Second sealing ring; 30. Rectifier plate; 31. Rectifier space; 32. Rectifier aperture; 40. Metering module; 41. Protrusion. Detailed Implementation

[0017] Exemplary embodiments of this application will now be described in more detail with reference to the accompanying drawings. While exemplary embodiments of this application are shown in the drawings, it should be understood that this application may be implemented in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided to enable a more thorough understanding of this application and to fully convey the scope of this application to those skilled in the art.

[0018] It should be understood that the terminology used herein is for the purpose of describing particular exemplary embodiments only and is not intended to be limiting. Unless the context clearly indicates otherwise, the singular forms “a,” “an,” and “described” as used herein may also include the plural forms. The terms “comprising,” “including,” “containing,” and “having” are inclusive and therefore indicate the presence of the stated features, steps, operations, elements, and / or components, but do not exclude the presence or addition of one or more other features, steps, operations, elements, components, and / or combinations thereof. The method steps, processes, and operations described herein are not construed as requiring them to be performed in a particular order described or illustrated unless the order of performance is explicitly indicated. It should also be understood that additional or alternative steps may be used.

[0019] Although terms such as first, second, third, etc., may be used in this document to describe multiple elements, components, regions, layers, and / or segments, these elements, components, regions, layers, and / or segments should not be limited by these terms. These terms may be used only to distinguish one element, component, region, layer, or segment from another. Unless the context clearly indicates otherwise, terms such as "first," "second," and other numerical terms used herein do not imply order or sequence. Therefore, the first element, component, region, layer, or segment discussed below may be referred to as the second element, component, region, layer, or segment without departing from the teachings of the exemplary embodiments. In the description of this application, "multiple" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0020] For ease of description, spatial relative terms may be used in the text to describe the relationship of one element or feature relative to another element or feature, as shown in the figure. These relative terms include, for example, "inside," "outside," "middle," "outer," "below," "below," "above," "over," etc. Such spatial relative terms are intended to include different orientations of the device in use or operation, other than those depicted in the figure. For example, if the device in the figure rotates, then an element 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 may be otherwise oriented (rotated 90 degrees or in other directions), and the spatial relative descriptors used in the text will be interpreted accordingly.

[0021] In the description of the application, the technical terms "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "circumferential", "height direction", "first direction", "second direction", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing the embodiments of this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed, operated or used in a specific orientation. Therefore, they should not be construed as limitations on the embodiments of this application.

[0022] In this application, unless otherwise expressly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection, an electrical connection, or a connection that allows communication between components; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise expressly limited. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0023] Ultrasonic gas meters are metering devices that use ultrasonic technology to measure gas flow. They offer high accuracy, precisely capturing even minute flow rates, and have a wide measurement range, making them suitable for various gas usage scenarios, including residential and commercial applications.

[0024] Low installation accuracy between the casing and valve assembly of an ultrasonic gas meter leads to poor sealing between them, resulting in gas leakage and affecting the measurement accuracy. Therefore, the installation accuracy of the valve assembly relative to the casing can affect the measurement accuracy of the ultrasonic gas meter. It is evident that improving the installation accuracy of the valve assembly relative to the casing is an important research direction.

[0025] In order to at least address the problem of improving the installation accuracy of the valve assembly relative to the housing, embodiments of this application propose a metering instrument 100 that can improve the installation accuracy of the valve assembly 20 relative to the housing assembly 10.

[0026] The metering instrument 100 of this application is described below with reference to the accompanying drawings.

[0027] Combination Figure 1 , Figure 2 , Figure 3 and Figure 4As shown, the metering instrument 100 of this embodiment includes a housing assembly 10 and a valve assembly 20. The housing assembly 10 defines a mounting cavity 115 and has an annular positioning structure 113 located within the mounting cavity 115. The valve assembly 20 is disposed within the mounting cavity 115 and has a valve port 21, at least a portion of which is embedded within the annular positioning structure 113. The valve port 21 has a chamfer.

[0028] The chamfer on the outer edge of the valve port 21 near the housing assembly 10 can be a fillet, a bevel, or another type of chamfer. As an example, the chamfer on the outer edge of the valve port 21 near the housing assembly 10 is as follows: Figure 1 , Figure 2 and Figure 3 As shown at point c in the middle.

[0029] When installing the metering instrument 100 of this embodiment, the valve port 21 is aligned with the annular positioning structure 113, and the valve port 21 and the annular positioning structure 113 are brought close to each other, so that the valve port 21 extends into the annular positioning structure 113.

[0030] As the valve port 21 is about to enter the annular positioning structure 113, the chamfer of the valve port 21 guides its movement into the annular positioning structure 113, thereby correcting the alignment deviation between the valve port 21 and the annular positioning structure 113 and achieving positional correction between them. The chamfer of the valve port 21 provides guidance, allowing it to smoothly enter the annular positioning structure 113.

[0031] Furthermore, the chamfering of the valve port 21 can reduce the sharpness of the edge of the valve port 21, thereby reducing the scratches caused by friction between the valve port 21 and the annular positioning structure 113, thus improving the integrity of the mating surface between the valve port 21 and the annular positioning structure 113, and thus improving the fitting accuracy between the valve port 21 and the annular positioning structure 113.

[0032] The main body of the annular positioning structure 113 is annular, thus forming a space within the annular positioning structure 113 that can accommodate the valve port 21. Along the circumferential direction of the valve port 21, the annular positioning structure 113 is a closed structure. When any mismovement occurs between the annular positioning structure 113 and the valve port 21 in the inward or outward direction of the valve port 21, the annular positioning structure 113 can make contact with the valve port 21 to guide each other.

[0033] In summary, by mutually restricting the valve port 21 and the annular positioning structure 113, the mis-offset between the valve port 21 and the annular positioning structure 113 can be reduced, thereby maintaining a high installation accuracy between the valve port 21 and the annular positioning structure 113, and thus improving the installation accuracy between the valve assembly 20 and the housing assembly 10.

[0034] Combination Figure 2 , Figure 3 and Figure 11 As shown, in some embodiments, the housing assembly 10 includes a first housing 11, the first housing 11 including a first main body portion 111, a stepped portion 117 and an annular positioning structure 113. The annular positioning structure 113 is connected to the first main body portion 111, the stepped portion 117 is connected to the first main body portion 111, the stepped portion 117 is located inside the annular positioning structure 113 along the radial direction, and the stepped portion 117 is disposed opposite to the valve port 21 along the axial direction of the annular positioning structure 113 to limit the valve port 21.

[0035] As an example, the radial direction of the annular positioning structure 113 is as follows: Figure 11 The arrow at point e indicates this.

[0036] As an example, the axial direction of the annular positioning structure 113 is as follows: Figure 11 As indicated by the arrow at point d.

[0037] The step portion 117 is arranged opposite to the valve port 21. The step portion 117 and the valve port 21 may be positioned correspondingly, with the step portion 117 and the valve port 21 spaced apart; or the step portion 117 may abut against the valve port 21.

[0038] When the valve port 21 has a tendency to overextension, the step portion 117 contacts the valve port 21 to limit the overextension of the valve port 21. Therefore, the step portion 117 corresponds to the valve port 21 and can limit the valve port 21 in the axial direction of the annular positioning structure 113 within a suitable range through the step portion 117, so as to avoid the valve port 21 from overextension.

[0039] Combination Figure 2 , Figure 3 and Figure 11 As shown, in some embodiments, the first housing 11 further includes a connecting pipe 118 disposed on the step portion 117. The connecting pipe 118 is located on the side of the step portion 117 away from the positioning structure, and the connecting pipe 118, the step portion 117 and the valve port 21 are interconnected.

[0040] Connector 118 can be either an inlet or outlet pipe. When connector 118 is an inlet pipe, valve port 21 is used to receive gas from connector 118. When connector 118 is an outlet pipe, valve port 21 is used to discharge gas into connector 118. Figure 2 As shown, as a specific example, pipe 118 is an exhaust pipe.

[0041] By connecting the nozzle 118 and the step 117 to the valve port 21, the airflow from the valve port 21 to the nozzle 118 or from the valve port 21 to the nozzle 118 can flow smoothly.

[0042] Combination Figure 1 , Figure 2 , Figure 3 and Figure 4 As shown, in some embodiments, the inner edge of the annular positioning structure 113 opposite to the first main body 111 is chamfered.

[0043] The chamfer on the inner edge of the annular positioning structure 113 at the end opposite to the first main body 111 can be a fillet, a bevel, or another type of chamfer. As an example, the chamfer on the outer edge of the valve port 21 near the housing assembly 10 is as follows: Figure 2 and Figure 3 As shown at point d in the middle.

[0044] As the valve port 21 extends into the annular positioning structure 113, the chamfer of the annular positioning structure 113 guides the valve port 21 to move into the annular positioning structure 113, thereby further correcting the alignment deviation between the valve port 21 and the annular positioning structure 113, achieving positional correction between the valve port 21 and the annular positioning structure 113. The guiding effect provided by the chamfer of the valve port 21 allows it to smoothly enter the annular positioning structure 113.

[0045] Furthermore, the chamfering of the annular positioning structure 113 can reduce the sharpness of its edge, thereby reducing scratches caused by friction between the valve port 21 and the annular positioning structure 113, thus improving the integrity of the mating surface between the valve port 21 and the annular positioning structure 113, and thus improving the fitting accuracy between the valve port 21 and the annular positioning structure 113.

[0046] Combination Figure 2 and Figure 3 As shown, in some preferred embodiments, the chamfer of the valve port 21 is an angled bevel, and the chamfer of the inner edge of the annular positioning structure 113 at the end opposite to the first main body 111 is a rounded corner.

[0047] The chamfer provides a clear linear guide, thereby increasing the accuracy of the embedding path. When the chamfer of the outer edge of the valve port 21 near the housing assembly 10 is chamfered, the valve port 21 can be more easily embedded into the annular positioning structure 113 under the guidance of the chamfer.

[0048] Rounded corners provide a smooth transition. When the inner edge of the annular positioning structure 113 facing away from the first main body 111 is rounded, the rounded corner reduces the obstruction effect on the valve port 21 when the annular positioning structure 113 contacts the side wall of the valve port 21, thereby reducing the probability of jamming between the annular positioning structure 113 and the valve port 21. In addition, since there are no obvious inflection points on the surface of the rounded corner, the rounded corner can further reduce scratches caused by friction between the valve port 21 and the annular positioning structure 113 when in contact with the valve port 21, thereby further improving the integrity of the mating surface between the valve port 21 and the annular positioning structure 113.

[0049] In summary, the chamfer on the outer edge of the valve port 21 near the housing assembly 10 is an angled chamfer, and the chamfer on the inner edge of the annular positioning structure 113 away from the first main body 111 is a rounded chamfer. This provides good guiding capability and increases the smoothness of the valve port 21 being embedded in the annular positioning structure 113.

[0050] Combination Figure 1 , Figure 2 , Figure 5 and Figure 10 In some embodiments, the first housing 11 further includes a first mounting edge 112 connected to the first main body portion 111, and the housing assembly 10 further includes a second housing 12, the second housing 12 including a second main body portion 121 and a second mounting edge 122 connected to the second main body portion 121, the first main body portion 111 and the second main body portion 121 defining a mounting cavity 115, and the first mounting edge 112 and the second mounting edge 122 being shaped to fit each other and connected to each other.

[0051] The shape matching of the first mounting edge 112 and the second mounting edge 122 means that the shapes of the first mounting edge 112 and the second mounting edge 122 are similar or identical.

[0052] When the shapes of the first mounting edge 112 and the second mounting edge 122 are matched, the assembler can quickly align the first housing 11 and the second housing 12 by using the shapes of the first mounting edge 112 and the second mounting edge 122, thereby achieving coarse positioning of the first housing 11 and the second housing 12, which can greatly improve assembly efficiency.

[0053] Combination Figure 2 and Figure 3 As shown, in some specific embodiments, the housing assembly 10 further includes a first sealing ring 13, which is sandwiched between the first mounting edge 112 and the second mounting edge 122.

[0054] The first sealing ring 13 can increase the airtightness of the mounting cavity 115, thereby reducing the probability of air leakage in the mounting cavity 115, thus increasing the safety of the metering instrument 100 in this embodiment, and indirectly increasing the accuracy of the valve assembly 20.

[0055] Combination Figure 1 , Figure 2 and Figure 9As shown, in some embodiments, the metering instrument 100 further includes a rectifier plate 30 disposed in the mounting cavity 115. The rectifier plate 30 and the first main body 111 define a rectification space 31. The first main body 111 is provided with an air inlet 114. The rectifier plate 30 is provided with a rectification hole 32. The rectification space 31 communicates with the air inlet 114 and communicates with the mounting cavity 115 through the rectification hole 32. The metering instrument 100 also includes a metering module 40 with a protrusion 41. The protrusion 41 corresponds to the position of at least a portion of the rectification hole 32. At least a portion of the protrusion 41 is located within the rectification hole 32.

[0056] The gas enters the rectification space 31 through the air inlet 114. Under the pressure of the rectification space 31, the gas diffuses through the rectification hole 32, thereby making the gas distribution in the installation cavity 115 uniform and improving the measurement accuracy of the metering module 40 located in the installation cavity 115.

[0057] In addition, the rectifier space 31 can buffer the gas, reducing the probability of local high pressure gas impact damaging the metering module 40.

[0058] To meet structural requirements, the metering module 40 has a protrusion 41. Since at least part of the protrusion 41 is located inside the rectifier hole 32, the rectifier hole 32 can avoid the protrusion 41 of the metering module 40, thereby increasing space utilization and reducing the overall size of the metering instrument 100 in this embodiment.

[0059] Furthermore, at least a portion of the protrusion 41 is located within the rectifier hole 32, which enables the protrusion 41 and the rectifier plate 30 to mutually restrict each other, thereby reducing the probability of misalignment between the protrusion 41 and the rectifier plate 30.

[0060] Combination Figure 2 , Figure 3 , Figure 10 and Figure 11 As shown, in some specific embodiments, the first main body 111 is also provided with an air outlet 116, and the valve port 21 is connected to the air outlet 116, so that the gas discharged from the valve port 21 can be discharged from the air outlet 116.

[0061] Combination Figure 2 and Figure 3 As shown, in some specific embodiments, the valve assembly 20 further includes a second sealing ring 22, which is sandwiched between the outer peripheral wall of the valve port 21 and the inner peripheral wall of the annular positioning structure 113.

[0062] The second sealing ring 22 can block the gas in the mounting cavity 115, thereby reducing the probability of gas in the mounting cavity 115 entering the valve port 21 and the gas outlet 116, and further reducing the probability of abnormal gas escape from the mounting cavity 115, thereby increasing the measurement accuracy of the metering instrument 100 in this embodiment.

[0063] Combination Figure 2 , Figure 4 , Figure 6 and Figure 7 As shown, in some embodiments, the second housing 12 further includes a plurality of first mounting ribs 123 disposed on the second main body portion 121. The first mounting rib 123 includes a first abutting portion 1231 and a second abutting portion 1232 connected to each other. The first abutting portion 1231 is located on the side of the metering module 40 away from the first housing 11 and abuts against the metering module 40. The metering module 40 is located between at least one second abutting portion 1232 of the first mounting rib 123 and at least another second abutting portion 1232 of the first mounting rib 123, and abuts against the second abutting portion 1232 of each first mounting rib 123.

[0064] The first abutting part 1231 is located on the side of the metering module 40 away from the first housing 11 and abuts against the metering module 40. The metering module 40 can be supported by the first abutting part 1231.

[0065] The metering module 40 is located between the second abutment portion 1232 of at least one first mounting rib 123 and the second abutment portion 1232 of at least another first mounting rib 123, that is, the second abutment portions 1232 of at least two first mounting ribs 123 are located on both sides of the metering module 40. The lateral abutment action of the second abutment portions 1232 can restrict the lateral movement of the metering module 40.

[0066] The metering module 40 can be limited in multiple directions by the first abutting part 1231 and the second abutting part 1232, so that the metering module 40 can be stably installed on the first mounting rib 123.

[0067] In addition, the first mounting rib 123 can act as a reinforcing rib, and by setting the first mounting rib 123, the strength of the second main body 121 can be increased.

[0068] like Figure 7 As shown, in some specific embodiments, the first mounting rib 123 further includes a first side rib 1233, which is connected to and intersects with the first abutting portion 1231, and the first side rib 1233 is spaced apart from the metering module 40.

[0069] The first side rib 1233 increases the strength of the first abutment portion 1231 and reduces the probability of damage to the first abutment portion 1231. Furthermore, the first side rib 1233 further strengthens the second main body portion 121.

[0070] The first side rib 1233 is spaced apart from the metering module 40, meaning that the first side rib 1233 and the metering module 40 are separated from each other, which can prevent the first side rib 1233 from interfering with the installation of the metering module 40.

[0071] Combination Figure 2 , Figure 4 , Figure 6 and Figure 8 As shown, in some embodiments, the second housing 12 further includes a plurality of second mounting ribs 124 disposed on the second main body portion 121. The plurality of second mounting ribs 124 are arranged sequentially along the circumference of the valve assembly 20. The second mounting ribs 124 include a third abutting portion 1241 and a fourth abutting portion 1242 connected to each other. The third abutting portion 1241 is located on the side of the valve assembly 20 away from the first housing 11 and abuts against the metering module 40. The valve assembly 20 is located between the fourth abutting portions 1242 of the plurality of second mounting ribs 124 and abuts against the fourth abutting portion 1242 of each second mounting rib 124.

[0072] The third abutment part 1241 is located on the side of the valve assembly 20 away from the first housing 11 and abuts against the metering module 40. The metering module 40 can be supported by the third abutment part 1241.

[0073] Multiple second mounting ribs 124 are arranged sequentially along the circumference of the valve assembly 20. The valve assembly 20 is located between the fourth abutment portions 1242 of the multiple second mounting ribs 124 and abuts against the fourth abutment portion 1242 of each second mounting rib 124. Therefore, each fourth abutment portion 1242 abuts against the outer surface of the valve assembly 20. The lateral abutment action of the fourth abutment portion 1242 can restrict the lateral movement of the valve assembly 20.

[0074] The valve assembly 20 can be limited in multiple directions by the third abutment portion 1241 and the fourth abutment portion 1242, so that the valve assembly 20 can be securely installed on the second mounting rib 124.

[0075] like Figure 2 As shown, in some specific embodiments, the second mounting rib 124 further includes a second side rib 1243, which is connected to and intersects with the third abutment portion 1241, and the second side rib 1243 is spaced apart from the valve assembly 20.

[0076] The second side rib 1243 increases the strength of the third abutment portion 1241 and reduces the probability of damage to the third abutment portion 1241. Furthermore, the second side rib 1243 further strengthens the second main body portion 121.

[0077] By spaced apart from the valve assembly 20, the second side rib 1243 can be prevented from interfering with the installation of the valve assembly 20.

[0078] In some specific embodiments, the metering module 40 is integrated with the valve assembly 20.

[0079] By integrating the metering module 40 and the valve assembly 20 into one unit, the number of assembly parts can be reduced, thereby improving the efficiency of installing the metering instrument 100 of this embodiment.

[0080] The assembly between the valve port 21 and the annular positioning structure 113 can improve the installation accuracy, thereby improving the installation accuracy of the valve assembly 20. By integrating the metering module 40 with the valve assembly 20, the installation accuracy of the metering module 40 can be improved, thereby increasing the metering accuracy.

[0081] Combination Figure 5 and Figure 6 As shown, in some embodiments, the second mounting edge 122 is provided with a plurality of thickened portions 125, each thickened portion 125 is provided with a threaded hole, and the second main body portion 121 is provided with a plurality of grooves 126, the plurality of grooves 126 are provided in a one-to-one correspondence with the plurality of thickened portions 125, and the shape of each groove 126 is adapted to the outer contour of the corresponding thickened portion 125.

[0082] The thickened portion 125 increases the size of the second mounting edge 122, allowing the second housing 12 to maintain a small thickness while providing sufficient space for threaded holes.

[0083] By providing a groove 126 whose shape matches the outer contour of the thickened portion 125, interference between the second main body portion 121 and the threaded component passing through the threaded hole can be avoided. When installing the threaded component, the groove 126 can guide the threaded component, thereby making the threaded component more accurately aligned with the threaded hole, thus increasing installation efficiency.

[0084] In some embodiments, a portion of the groove 126 is disposed on the first outer peripheral surface of the second main body portion 121, and another portion of the groove 126 is disposed on the second outer peripheral surface of the second main body portion 121. The first outer peripheral surface and the second outer peripheral surface are disposed opposite to each other. The metering instrument 100 also includes a dial assembly for displaying readings. The dial assembly is disposed on the first outer peripheral surface and covers the groove 126 located on the first outer peripheral surface.

[0085] The dial assembly can cover the groove 126 located on the first outer peripheral surface, thereby improving the aesthetics of the meter 100 in this embodiment.

[0086] To facilitate reading, the side of the measuring instrument 100 with the dial assembly is usually made the front. Since the second outer peripheral surface is opposite to the first outer peripheral surface, the groove 126 located on the second outer peripheral surface is not easily observed. Therefore, the aesthetics of the measuring instrument 100 in this embodiment can be further improved.

[0087] Combination Figure 3 and Figure 11 As shown, in some embodiments, along the axial direction of the annular positioning structure 113, the first mounting edge 112 and the annular positioning structure 113 are located on the same side of the first main body 111, and the annular positioning structure 113 is located between the first main body 111 and the first mounting edge 112, so that the annular positioning structure 113 has a shorter dimension.

[0088] By making the annular positioning structure 113 shorter, the mold for producing the annular positioning structure 113 can have a smaller cavity design, which reduces the difficulty of mold processing. Making the annular positioning structure 113 smaller also reduces the probability of processing defects such as shrinkage marks and deformation, thereby reducing production difficulty and improving product qualification rate.

[0089] In other embodiments, along the axial direction of the annular positioning structure 113, the first mounting edge 112 and the annular positioning structure 113 are located on the same side of the first main body 111, with a portion of the annular positioning structure 113 located on the side of the first mounting edge 112 closer to the first main body 111, and another portion of the annular positioning structure 113 located on the side of the first mounting edge 112 away from the first main body 111. That is, the annular positioning structure 113 is relatively long, with a portion of the annular positioning structure 113 extending beyond the first main body 111.

[0090] Because the annular positioning structure 113 has a relatively long dimension, when installing the first housing 11, the annular positioning structure 113 on the side of the first mounting edge 112 away from the first main body 111 mates with the valve port 21. Then, through the coarse positioning of the first mounting edge 112 and the second mounting edge 122, the installation accuracy between the first housing 11 and the valve assembly 20 can be increased, and the installation accuracy between the first housing 11 and the second housing 12 can also be increased.

[0091] In some embodiments, the inner radius of the annular positioning structure 113 is a, and the outer radius of the valve port 21 is b, wherein 0.2 mm ≤ ab ≤ 0.6 mm.

[0092] As an example, a and b are like Figure 3 The arrows at points a and b indicate this.

[0093] When ab is less than 0.2mm, the gap between the valve port 21 and the annular positioning structure 113 is too small, making it difficult for the valve port 21 to enter the annular positioning structure 113.

[0094] When ab is greater than 0.2mm, the gap between valve port 21 and annular positioning structure 113 is too large, resulting in poor accuracy between valve port 21 and annular positioning structure 113.

[0095] When 0.2mm≤ab≤0.6mm, the valve port 21 can maintain a suitable distance from the annular positioning structure 113, which can reduce the difficulty of the valve port 21 entering the annular positioning structure 113 and ensure the accuracy between the valve port 21 and the annular positioning structure 113.

[0096] In some embodiments, the height h of the annular positioning structure 113 satisfies: 5 mm ≤ h ≤ 10 mm.

[0097] As an example, h is... Figure 11 The arrow at position h indicates this.

[0098] When h is less than 5mm, the length of the annular positioning structure 113 is small, the positioning guidance of the annular positioning structure 113 is insufficient, and misalignment between the annular positioning structure 113 and the valve port 21 is likely to occur.

[0099] When h is greater than 10mm, the length of the annular positioning structure 113 is relatively large, making the processing of the annular positioning structure 113 more difficult and wasting materials.

[0100] When 5mm≤h≤10mm, the annular positioning structure 113 can have good guiding performance, while reducing the processing difficulty and avoiding material waste.

[0101] The above description is merely a preferred embodiment of this application, but the scope of protection of this application is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in this application should be included within the scope of protection of this application. Therefore, the scope of protection of this application should be determined by the scope of the claims.

Claims

1. A measuring instrument, characterized in that, include: A housing assembly that defines a mounting cavity and has an annular positioning structure located within the mounting cavity; A valve assembly is disposed within the mounting cavity. The valve assembly has a valve port, at least a portion of which is embedded within the annular positioning structure. The outer edge of the valve port is chamfered.

2. The metering instrument according to claim 1, characterized in that, The housing assembly includes a first housing, the first housing including a first main body, a stepped portion and the annular positioning structure, the annular positioning structure being connected to the first main body, the stepped portion being connected to the first main body, the stepped portion being located within the annular positioning structure along the radial direction of the annular positioning structure, and the stepped portion being disposed opposite to the valve port along the axial direction of the annular positioning structure to limit the valve port.

3. The metering instrument according to claim 2, characterized in that, The first housing also includes a connecting pipe disposed on the stepped portion, the connecting pipe being located on the side of the stepped portion away from the positioning structure, and the connecting pipe, the stepped portion, and the valve port communicating with each other.

4. The metering instrument according to claim 2, characterized in that, The first housing further includes a first mounting edge connected to the first main body portion. The housing assembly further includes a second housing, the second housing including a second main body portion and a second mounting edge connected to the second main body portion. The first main body portion and the second main body portion define the mounting cavity. The first mounting edge and the second mounting edge are shaped to fit each other and are connected to each other.

5. The metering instrument according to claim 4, characterized in that, The metering instrument further includes a rectifier plate disposed in the mounting cavity. The rectifier plate and the first main body define a rectification space. The first main body is provided with an air inlet. The rectifier plate is provided with a rectification hole. The rectification space communicates with the air inlet and with the mounting cavity through the rectification hole. The metering instrument further includes a metering module with protrusions. The protrusions correspond to the positions of at least a portion of the rectification holes, and at least a portion of the protrusions are located within the rectification holes.

6. The metering instrument according to claim 4, characterized in that, The second housing further includes a plurality of first mounting ribs disposed on the second main body portion. Each first mounting rib includes a first abutting portion and a second abutting portion connected to each other. The first abutting portion is located on the side of the metering module away from the first housing and abuts against the metering module. The metering module is located between the second abutting portion of at least one first mounting rib and the second abutting portion of at least another first mounting rib, and abuts against the second abutting portion of each first mounting rib.

7. The metering instrument according to claim 6, characterized in that, The second housing further includes a plurality of second mounting ribs disposed on the second main body portion. The plurality of second mounting ribs are arranged sequentially along the circumference of the valve assembly. Each second mounting rib includes a third abutment portion and a fourth abutment portion connected to each other. The third abutment portion is located on the side of the valve assembly away from the first housing and abuts against the metering module. The valve assembly is located between the fourth abutment portions of the plurality of second mounting ribs and abuts against the fourth abutment portion of each second mounting rib.

8. The metering instrument according to claim 4, characterized in that, The second mounting edge is provided with multiple thickened parts, each of which is provided with a threaded hole. The second main body is provided with multiple grooves, each of which is provided in a one-to-one correspondence with the multiple thickened parts. The shape of each groove is adapted to the outer contour of the corresponding thickened part. A portion of the plurality of grooves is disposed on the first outer peripheral surface of the second main body, and another portion of the plurality of grooves is disposed on the second outer peripheral surface of the second main body. The first outer peripheral surface and the second outer peripheral surface are disposed opposite to each other. The measuring instrument further includes a dial assembly, which is mounted on the first outer peripheral surface and covers the grooves located on the first outer peripheral surface; and / or, The inner edge of the annular positioning structure opposite to the first main body is chamfered.

9. The metering instrument according to claim 4, characterized in that, Along the axial direction of the annular positioning structure, the first mounting edge and the annular positioning structure are located on the same side of the first main body, and the annular positioning structure is located between the first main body and the first mounting edge; or, Along the axial direction of the annular positioning structure, the first mounting edge and the annular positioning structure are located on the same side of the first main body, part of the annular positioning structure is located on the side of the first mounting edge closer to the first main body, and another part of the annular positioning structure is located on the side of the first mounting edge away from the first main body.

10. The measuring instrument according to any one of claims 1 to 9, characterized in that, The inner radius of the annular positioning structure is *a*, and the outer radius of the valve port is *b*, wherein 0.2 mm ≤ ab ≤ 0.6 mm; and / or, The height h of the annular positioning structure satisfies: 5mm ≤ h ≤ 10mm.

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