Volume correction instrument

Abstract

The utility model provides a volume correction instrument, and relates to the technical field of metering instruments. The volume correction instrument comprises a correction instrument main body and a pressure sensor, and the correction instrument main body comprises a shell; the pressure sensor is inserted into the shell, and the pressure sensor is used for being connected with the flow meter; the shell is provided with at least one first limiting part, the pressure sensor is provided with at least one second limiting part, and the first limiting part and the second limiting part are correspondingly matched to limit rotation of the pressure sensor relative to the shell. Therefore, air leakage at the joint of the correction instrument main body and the pressure sensor can be prevented, the measurement accuracy of the pressure sensor is ensured, and the correction precision of the volume correction instrument is prevented from being influenced.

Description

Technical Field

[0001] This application relates to the technical field of metering instruments, and particularly relates to a volume corrector. Background Art

[0002] An intelligent volume corrector is an intelligent secondary instrument that integrates a pressure sensor and can convert the flow rate in the pipeline measured by a flowmeter into the volume flow rate under standard conditions.

[0003] In the prior art, an intelligent volume corrector includes a volume corrector and a pressure sensor. The pressure sensor is connected to the volume corrector, and the pressure sensor is arranged inside the volume corrector. Part of the pressure sensor extends out of the volume corrector and is connected to the flowmeter. The pressure sensor is used to measure the pressure in the pipeline and transmit the pressure data to the volume corrector. The volume corrector corrects the flow rate measured by the flowmeter according to the pressure data and other environmental parameters.

[0004] However, when the above-mentioned pressure sensor is subjected to an external force, it is relatively easy to rotate relative to the volume corrector, resulting in air leakage at the connection between the pressure sensor and the volume corrector, which affects the correction accuracy of the volume corrector. Summary of the Utility Model

[0005] This application provides a volume corrector to solve the problem that air leakage easily occurs at the connection between the pressure sensor and the volume corrector in the prior art, which affects the correction accuracy of the volume corrector.

[0006] A volume corrector provided by this application includes: a corrector main body and a pressure sensor. The corrector main body includes a housing; the pressure sensor is inserted into the housing, and the pressure sensor is used to be connected to a flowmeter;

[0007] The housing has at least one first limiting portion, and the pressure sensor has at least one second limiting portion. The first limiting portion and the second limiting portion are correspondingly matched to limit the rotation of the pressure sensor relative to the housing.

[0008] In some embodiments, the housing includes a housing body and a limiting member located inside the housing body, and the first limiting portion is located on the limiting member;

[0009] The housing body has a first mounting hole, and the pressure sensor is inserted into the housing body through the first mounting hole.

[0010] In some embodiments, the limiting member has a second mounting hole, the second mounting hole is communicated with the first mounting hole, and the pressure sensor is inserted into the second mounting hole; at least part of the hole wall of the second mounting hole forms the first limiting portion.

[0011] In some embodiments, the pressure sensor includes a main body section and a connecting section, and the main body section is located inside the housing body; on one side of the main body section close to the connecting section, there is at least one first cutting surface, and the first cutting surface forms the second limiting portion.

[0012] In some embodiments, there is also at least one second cutting surface on the main body section, the second cutting surface is located on one side of the first cutting surface, and the second cutting surface abuts against the limiting member.

[0013] In some embodiments, there is at least one third limiting portion on the limiting member, and the third limiting portion abuts against the housing body to limit the rotation of the limiting member relative to the housing body.

[0014] In some embodiments, a fixing member and a washer are further included. The fixing member is sleeved on the pressure sensor, and the washer abuts between the fixing member and the outer peripheral side of the first mounting hole.

[0015] In some embodiments, a sealing ring is further included. There is a sealing groove on the pressure sensor, the sealing ring is located in the sealing groove, and the sealing ring abuts against the inner peripheral side of the first mounting hole.

[0016] In some embodiments, a connecting pipe and a mounting joint are further included. The mounting joint connects the pressure sensor and the connecting pipe, and the connecting pipe is used to connect with the flowmeter.

[0017] In some embodiments, a gasket is further included, and the gasket abuts between the mounting joint and the pressure sensor.

[0018] A volume corrector provided by the present application includes: a corrector main body and a pressure sensor. The corrector main body includes a housing. The pressure sensor is inserted into the housing, and the pressure sensor is used to connect with the flowmeter. There is at least one first limiting portion on the housing, and there is at least one second limiting portion on the pressure sensor. The first limiting portion and the second limiting portion are correspondingly matched to limit the rotation of the pressure sensor relative to the housing, thereby effectively preventing the pressure sensor from rotating relative to the housing under the action of external force, resulting in loosening at the insertion joint between the pressure sensor and the corrector main body, ensuring the stability of the connection between the corrector main body and the pressure sensor, preventing air leakage at the insertion joint between the corrector main body and the pressure sensor, thereby ensuring the accuracy of the measurement by the pressure sensor and avoiding affecting the correction accuracy of the volume corrector. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] The drawings here are incorporated into the specification and form a part of this specification, showing embodiments consistent with the present application, and are used together with the specification to explain the principles of the present application.

[0020] Figure 1Schematic diagram of the structure of the volume corrector provided by the embodiment of the present application;

[0021] Figure 2 is Figure 1 partial explosion schematic diagram of;

[0022] Figure 3 is Figure 1 schematic diagram of the structure of a partial housing and a pressure sensor in;

[0023] Figure 4 is Figure 3 enlarged schematic diagram at position A in;

[0024] Figure 5 is Figure 1 partial sectional view of;

[0025] Figure 6 is Figure 5 enlarged schematic diagram at position B in.

[0026] Through the above-mentioned drawings, the specific embodiments of the present application have been shown, and there will be more detailed descriptions hereinafter. These drawings and textual descriptions are not intended to limit the scope of the inventive concept of the present utility model in any way, but to illustrate the concept of the present application to those skilled in the art by referring to specific embodiments.

[0027] Description of reference numerals:

[0028] 100 - corrector main body;

[0029] 110 - housing;

[0030] 111 - housing body;

[0031] 112 - first mounting hole;

[0032] 113 - limiting member;

[0033] 114 - second mounting hole;

[0034] 115 - first limiting portion;

[0035] 116 - third limiting portion;

[0036] 200 - pressure sensor;

[0037] 210 - main body section;

[0038] 211 - second limiting portion;

[0039] 212 - second section plane;

[0040] 213 - sealing groove;

[0041] 220 - connecting section;

[0042] 300 - Connecting pipe;

[0043] 400 - Installation joint;

[0044] 410 - First connecting piece;

[0045] 420 - Second connecting piece;

[0046] 430 - First ferrule;

[0047] 440 - Second ferrule;

[0048] 500 - Fixing piece;

[0049] 600 - Washer;

[0050] 700 - Sealing ring;

[0051] 800 - Spacer;

[0052] 900 - Elastic gasket. Detailed implementation mode

[0053] Hereinafter, exemplary embodiments will be described in detail, and examples thereof are shown in the drawings. When the following description refers to the drawings, unless otherwise indicated, the same numbers in different drawings represent the same or similar elements. The implementation manners described in the following exemplary embodiments do not represent all implementation manners consistent with the present application. On the contrary, they are merely examples of devices and methods consistent with some aspects of the present application as detailed in the appended claims.

[0054] In the prior art, an intelligent volume corrector includes a volume corrector and a pressure sensor. The pressure sensor is connected to the volume corrector, and the pressure sensor is disposed inside the volume corrector. Part of the pressure sensor extends out of the volume corrector and is connected to a flowmeter. The pressure sensor is used to measure the pressure in the pipeline and transmit the pressure data to the volume corrector. The volume corrector corrects the flow rate measured by the flowmeter according to environmental parameters such as the pressure data. However, when the above - mentioned pressure sensor is subjected to an external force, it is relatively easy to rotate relative to the volume corrector, resulting in air leakage at the connection between the pressure sensor and the volume corrector. As a result, the pressure sensor cannot accurately measure the actual pressure in the pipeline, affecting the correction accuracy of the volume corrector.

[0055] Based on this, an embodiment of the present application provides a volume corrector, including: a corrector main body and a pressure sensor, and the corrector main body includes a housing. The pressure sensor is inserted into the housing and is used to connect with a flowmeter. There is at least one first limiting portion on the housing, and at least one second limiting portion on the pressure sensor. The first limiting portion and the second limiting portion are correspondingly matched to limit the rotation of the pressure sensor relative to the housing, thereby effectively preventing the pressure sensor from rotating relative to the housing under the action of an external force, ensuring the stability of the connection between the corrector main body and the pressure sensor, preventing air leakage at the connection between the corrector main body and the pressure sensor, thus ensuring the accuracy of the measurement of the pressure sensor and avoiding affecting the correction accuracy of the volume corrector.

[0056] The embodiments of the present application will be described below with reference to the accompanying drawings.

[0057] Refer to Figures 1 to 4 , a volume corrector provided by an embodiment of the present application includes: a corrector main body 100 and a pressure sensor 200, and the corrector main body 100 includes a housing 110. The pressure sensor 200 is inserted into the housing 110 and is used to connect with a flowmeter.

[0058] There is at least one first limiting portion 115 on the housing 110, and at least one second limiting portion 211 on the pressure sensor 200. The first limiting portion 115 and the second limiting portion 211 are correspondingly matched to limit the rotation of the pressure sensor 200 relative to the housing 110.

[0059] Among them, the first limiting portion 115 can be integrally formed with the housing 110, or the first limiting portion 115 can also be directly connected to the housing 110.

[0060] It can be understood that the number of the second limiting portions 211 can be multiple, and the second limiting portions 211 are arranged at intervals on the pressure sensor 200, and the first limiting portion 115 and the second limiting portion 211 are arranged in one-to-one correspondence. By providing a plurality of first limiting portions 115 and a plurality of second limiting portions 211, there are multiple matching positions between the first limiting portion 115 and the second limiting portion 211, thereby facilitating the matching connection between the first limiting portion 115 and the second limiting portion 211, and thus facilitating the limiting of the pressure sensor 200.

[0061] The volume corrector provided by the embodiment of the present application is provided with a first limiting portion 115 on the housing 110 and a second limiting portion 211 on the pressure sensor 200. The first limiting portion 115 cooperates with the second limiting portion 211 to prevent the pressure sensor 200 from rotating relative to the housing 110. Furthermore, it can effectively prevent the pressure sensor 200 from loosening due to rotation relative to the housing 110 under the action of external force, ensure the stability of the connection between the corrector main body 100 and the pressure sensor 200, prevent air leakage at the connection between the corrector main body 100 and the pressure sensor 200, thereby ensuring the accuracy of the measurement of the pressure sensor 200 and avoiding affecting the correction accuracy of the volume corrector.

[0062] Referring to Figure 3 and Figure 4 In specific implementation, the housing 110 includes a housing body 111 and a limiting member 113 located inside the housing body 111. The first limiting portion 115 is located on the limiting member 113. The housing body 111 has a first mounting hole 112, and the pressure sensor 200 is inserted into the housing body 111 through the first mounting hole 112.

[0063] Among them, the housing body 111 can be integrally formed with the limiting member 113, or the housing body 111 can be directly or indirectly connected to the limiting member 113.

[0064] In this way, the pressure sensor 200 is limited by the first limiting portion 115 on the limiting member 113 without changing the structure of the housing body 111. Compared with setting the first limiting portion 115 on the housing body 111, setting the limiting member 113 and setting the first limiting portion 115 on the limiting member 113 is relatively simple and convenient.

[0065] In some embodiments, the first mounting hole 112 is non-circular, the hole wall of the first mounting hole 112 forms the first limiting portion 115, a part of the outer surface of the pressure sensor 200 forms the second limiting portion 211, and the first limiting portion 115 cooperates with the second limiting portion 211 to limit the pressure sensor 200.

[0066] Referring to Figure 3 and Figure 4 In some embodiments, the limiting member 113 has a second mounting hole 114, the second mounting hole 114 communicates with the first mounting hole 112, and a part of the pressure sensor 200 is inserted into the second mounting hole 114. At least a part of the hole wall of the second mounting hole 114 forms the first limiting portion 115.

[0067] Among them, when the pressure sensor 200 is inserted into the second mounting hole 114, the first limiting portion 115 can cooperate with the second limiting portion 211. Thus, the cooperation between the first limiting portion 115 and the second limiting portion 211 is relatively convenient.

[0068] In some embodiments, there is at least one limiting block on the housing 110. The limiting block forms the second limiting portion 211, and the limiting block is disposed on the periphery of the first mounting hole 112. On the end face of the main body section 210 facing the connecting section 220, there is at least one limiting groove, and the limiting groove forms the first limiting portion 115. The limiting block matches the limiting groove, and the limiting block is inserted into the limiting groove to limit the rotation of the main body section 210 relative to the housing 110, and further limit the rotation of the pressure sensor 200 relative to the housing 110. Exemplarily, the limiting block can be a cuboid.

[0069] Referring to Figure 2 and Figure 4 , in a specific implementation, the pressure sensor 200 includes a main body section 210 and a connecting section 220, and the main body section 210 is located inside the housing body 111. On one side of the main body section 210 close to the connecting section 220, there is at least one first cutting surface, and the first cutting surface forms the second limiting portion 211.

[0070] Wherein, the main body section 210 and the connecting section 220 are coaxially arranged. The connecting section 220 partially extends out of the housing body 111 and is connected to the flowmeter. The diameter of the main body section 210 is greater than the diameter of the connecting section 220. The connecting section 220 matches the first mounting hole 112, and the main body section 210 abuts against the inner peripheral side of the first mounting hole 112 to limit the main body section 210. The second limiting portion 211 is located on one side of the main body section 210 close to the connecting section 220 to facilitate the cooperation between the second limiting portion 211 and the first limiting portion 115.

[0071] Specifically, the first cutting surface is a plane, at least part of the inner wall of the second mounting hole 114 is a plane, and the first cutting surface abuts against part of the inner wall of the second mounting hole 114 so that the first cutting surface cannot rotate relative to the inner wall of the second mounting hole 114, and further the pressure sensor 200 cannot rotate relative to the second mounting hole 114, thereby limiting the pressure sensor 200.

[0072] Referring to Figure 4 , in some embodiments, there is also at least one second cutting surface 212 on the main body section 210. The second cutting surface 212 is correspondingly located on one side of the first cutting surface, and the second cutting surface 212 abuts against the limiting member 113 correspondingly.

[0073] Wherein, by setting the second cutting surface 212, there is an included angle between the first cutting surface and the second cutting surface 212. When the first cutting surface cooperates with the first limiting portion 115, the second cutting surface 212 abuts against the limiting member 113 to limit the limiting member 113 between the main body section 210 and the housing body 111, preventing the limiting member 113 from moving and causing the first cutting surface to disengage from the first limiting portion 115.

[0074] Specifically, the second cutting surface 212 is a plane, which is arranged on one side of the first cutting surface. The limiting member 113 is plate-shaped, and the second cutting surface 212 is parallel to the limiting member 113. When the first cutting surface abuts against the hole wall of the second mounting hole 114, the second cutting surface 212 abuts against the periphery of the second mounting hole 114, thereby restricting the limiting member 113 between the main body portion 210 and the housing body 111.

[0075] Referring Figure 3 and Figure 4 , in some embodiments, the limiting member 113 has at least one third limiting portion 116, and the third limiting portion 116 abuts against the housing body 111 to restrict the rotation of the limiting member 113 relative to the housing body 111.

[0076] Among them, the pressure sensor 200 cannot rotate relative to the limiting member 113, and the limiting member 113 cannot rotate relative to the housing body 111. Thus, the pressure sensor 200 cannot rotate relative to the housing body 111.

[0077] Specifically, the housing body 111 has a first inner side surface and a second inner side surface, the first inner side surface is adjacent to the second inner side surface, the second mounting hole 114 is located on the first inner side surface, and the third limiting portion 116 abuts against the second inner side surface, thereby preventing the limiting member 113 from rotating relative to the housing body 111.

[0078] Furthermore, one side of the limiting member 113 has at least one abutting surface, the abutting surface is a plane, and the abutting surface forms the third limiting portion 116. For example, the limiting member 113 has two legs, and the legs have abutting surfaces.

[0079] Referring Figure 2 , in specific implementation, the volume corrector provided by the embodiment of the present application further includes a fixing member 500 and a washer 600. The fixing member 500 is sleeved on the pressure sensor 200, and the washer 600 abuts between the fixing member 500 and the outer periphery of the first mounting hole 112.

[0080] Among them, by providing the fixing member 500 and the washer 600, the movement of the pressure sensor 200 towards the inside of the housing body 111 is restricted. In addition, the washer 600 plays a sealing role to prevent gas from leaking through the first mounting hole 112.

[0081] Exemplarily, the fixing member 500 is a nut. The connecting section 220 has an external thread, and the nut is sleeved on the external thread to be connected to the connecting section 220. The washer 600 is sleeved on the connecting section 220 and abuts against the outer periphery of the first mounting hole 112 to prevent the connecting section 220 from moving relative to the housing 110, thereby preventing the pressure sensor 200 from moving.

[0082] It should be noted that the first mounting hole 112 communicates the interior and the exterior of the housing body 111. The outer peripheral side of the first mounting hole 112 refers to the side of the first mounting hole 112 located outside the housing body 111.

[0083] In some embodiments, the volume corrector provided by the embodiments of the present application further includes an elastic gasket 900. The elastic gasket 900 is located between the fixing member 500 and the washer 600, and provides an elastic force through the elastic gasket 900 to prevent the fixing member 500 from loosening under vibration or dynamic load.

[0084] Refer to Figure 2 , in specific implementation, the volume corrector provided by the embodiments of the present application further includes a sealing ring 700. The pressure sensor 200 has a sealing groove 213. The sealing ring 700 is located in the sealing groove 213, and the sealing ring 700 abuts against the inner peripheral side of the first mounting hole 112.

[0085] Exemplarily, the sealing ring 700 is annular, and the sealing groove 213 is an annular groove matching the sealing ring 700. The sealing groove 213 is located on the end face of the main body section 210 facing the connecting section 220.

[0086] Specifically, by providing the sealing ring 700, the inner peripheral side of the first mounting hole 112 is sealed, thereby preventing the gas in the housing 110 from leaking. By providing the sealing groove 213 on the pressure sensor 200 to accommodate part of the sealing ring 700, the abutment between the sealing ring 700 and the pressure sensor 200 is made more stable and reliable.

[0087] It should be noted that the inner peripheral side of the first mounting hole 112 refers to the side of the first mounting hole 112 located inside the housing body 111.

[0088] Refer to Figure 2 、 Figure 5 and Figure 6 , in specific implementation, the volume corrector provided by the embodiments of the present application further includes a connecting pipe 300 and a mounting joint 400. The mounting joint 400 connects the pressure sensor 200 and the connecting pipe 300, and the connecting pipe 300 is used to connect with a flowmeter.

[0089] Wherein, by providing the connecting pipe 300 and the mounting joint 400, one end of the connecting pipe 300 is connected to the pressure sensor 200, and the other end of the connecting pipe 300 is connected to the flowmeter to communicate the flowmeter and the pressure sensor, making the connection between the pressure sensor 200 and the flowmeter more convenient. At the same time, connecting pipes 300 with different diameters can be connected to the pressure sensor 200 through the mounting joint 400. Therefore, in specific implementation, the connecting pipe 300 with a matching size can be selected according to the size of the pressure tapping interface of the flowmeter, so that the pressure sensor 200 can be connected to flowmeters of different specifications, thereby expanding the applicable range of the volume corrector.

[0090] Specifically, the installation joint 400 includes a first connecting member 410, a second connecting member 420, a first ferrule 430, and a second ferrule 440. The first connecting member 410 has a first connecting hole and a second connecting hole communicating with the first connecting hole. The second connecting member 420 has a third connecting hole and a fourth connecting hole communicating with the third connecting hole. The inner wall of the third connecting hole has a first internal thread, and the first connecting member 410 has a first external thread. A part of the first connecting member 410 is located in the third connecting hole so that the first internal thread is connected to the first external thread. At this time, the second connecting hole communicates with the third connecting hole.

[0091] The first ferrule 430 is located in the third connecting hole, and a part of the first ferrule 430 is inserted into the second connecting hole. The second ferrule 440 is located in the third connecting hole, and the second ferrule 440 is located between the second connecting member 420 and the first ferrule 430. The connecting pipe 300 is sequentially inserted into the second connecting hole through the fourth connecting hole, the second ferrule 440, and the first ferrule 430, and the connecting pipe 300 is fixedly connected by the first ferrule 430 and the second ferrule 440.

[0092] The inner wall of the first connecting hole has a second internal thread, and the connecting section 220 of the pressure sensor 200 has a second external thread. The connecting section 220 is partially located in the first connecting hole so that the second internal thread is connected to the second external thread.

[0093] It can be understood that when assembling the installation joint 400, the installation joint 400 needs to be rotated relative to the pressure sensor 200 so that the second internal thread is connected to the second external thread. When the installation joint 400 rotates relative to the pressure sensor 200, through the cooperation of the first limiting portion 115 and the second limiting portion 211, the installation joint 400 can be prevented from driving the pressure sensor 200 to rotate synchronously, thereby facilitating the assembly of the installation joint 400.

[0094] When assembling the connecting pipe 300, the connecting pipe 300 needs to be rotated and inserted into the second connecting hole. At this time, through the cooperation of the first limiting portion 115 and the second limiting portion 211, the connecting pipe 300 can be prevented from driving the pressure sensor 200 to rotate synchronously, thereby facilitating the assembly of the connecting pipe 300.

[0095] Refer to Figure 2 and 5 In a specific implementation, the volume corrector provided by the embodiment of the present application further includes a gasket 800, and the gasket 800 is located between the installation joint 400 and the pressure sensor 200.

[0096] Exemplarily, the gasket 800 is a PTFE gasket.

[0097] Specifically, the gasket 800 is located within the first connection hole, and the gasket 800 abuts against the end face of the connection section 220 to seal the connection between the connection section 220 and the installation joint 400, preventing air leakage between the connection section 220 and the installation joint 400 and affecting the accuracy of the pressure sensor 200.

[0098] In the description of the embodiments of the present application, the terms "first", "second", etc. in the specification, claims and the above drawings are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged under appropriate circumstances so as to implement the embodiments of the present application described herein. In addition, the terms "comprising" and "having" and any variations thereof are intended to cover non-exclusive inclusion.

[0099] In the embodiments of the present application, the orientation or positional relationship indicated by the terms "upper", "lower", "inner", "middle", "outer", "front", "rear", etc. is based on the orientation or positional relationship shown in the drawings. These terms are mainly used to better describe the present application and its embodiments, and are not used to limit that the indicated devices, elements or components must have a specific orientation or be constructed and operated in a specific orientation. Moreover, in addition to being able to represent an orientation or positional relationship, some of the above terms may also be used to represent other meanings. For example, the term "upper" may also be used to represent a certain attachment relationship or connection relationship in some cases. For those of ordinary skill in the art, the specific meanings of these terms in the embodiments of the present application can be understood according to specific circumstances.

[0100] In addition, the terms "arranged", "connected" and "fixed" should be understood in a broad sense. For example, "connected" can be a fixed connection, a detachable connection, or an integral structure; it can be a mechanical connection or an electrical connection; it can be directly connected, or indirectly connected through an intermediate medium, or there can be internal communication between two devices, elements or components. For those of ordinary skill in the art, the specific meanings of the above terms in the embodiments of the present disclosure can be understood according to specific circumstances.

[0101] Unless otherwise specified, the term "plurality" means two or more.

[0102] After considering the specification and practicing the application disclosed herein, those skilled in the art will readily conceive of other embodiments of the present application. The present application is intended to cover any variations, uses or adaptations of the present application, which follow the general principles of the present application and include common general knowledge or conventional technical means in the technical field not disclosed in the present application. The specification and examples are only regarded as exemplary, and the scope of the present application is only limited by the appended claims.

Claims

1. A volume corrector, characterized in that: include: A corrector body (100) and a pressure sensor (200), wherein the corrector body (100) includes a housing (110); The pressure sensor (200) is inserted into the housing (110), and the pressure sensor (200) is used to be connected to a flow meter; The housing (110) has at least one first limiting portion (115), and the pressure sensor (200) has at least one second limiting portion (211), and the first limiting portion (115) and the second limiting portion (211) cooperate with each other to limit the pressure sensor (200) from rotating relative to the housing (110).

2. The volume corrector according to claim 1, characterized in that: The housing (110) comprises a housing body (111) and a limiting member (113) located inside the housing body (111), and the first limiting portion (115) is located on the limiting member (113); The shell body (111) has a first mounting hole (112), and the pressure sensor (200) is inserted into the shell body (111) through the first mounting hole (112).

3. The volume corrector according to claim 2, characterized in that: The limiting member (113) has a second mounting hole (114), the second mounting hole (114) is in communication with the first mounting hole (112), and the pressure sensor (200) is inserted into the second mounting hole (114); At least a portion of the hole wall of the second mounting hole (114) forms the first limiting portion (115).

4. The volume corrector according to claim 2, characterized in that: The pressure sensor (200) comprises a main section (210) and a connecting section (220), wherein the main section (210) is located inside the shell body (111); The main body section (210) has at least one first cut surface on a side close to the connecting section (220), and the first cut surface forms the second limiting portion (211).

5. The volume corrector according to claim 4, characterized in that: The main body section (210) also has at least one second cut surface (212), the second cut surface (212) is located on one side of the first cut surface, and the second cut surface (212) abuts against the limiting component (113).

6. The volume corrector according to claim 2, characterized in that: The limiting member (113) is provided with at least one third limiting portion (116), and the third limiting portion (116) abuts against the shell body (111) to limit the rotation of the limiting member (113) relative to the shell body (111).

7. The volume corrector according to claim 2, characterized in that: It also includes a fixing member (500) and a gasket (600), wherein the fixing member (500) is sleeved on the pressure sensor (200), and the gasket (600) abuts between the fixing member (500) and the outer peripheral side of the first mounting hole (112).

8. The volume corrector according to claim 2, characterized in that: It also includes a sealing ring (700), the pressure sensor (200) has a sealing groove (213), the sealing ring (700) is located in the sealing groove (213), and the sealing ring (700) abuts against the inner peripheral side of the first mounting hole (112).

9. The volume corrector according to any one of claims 1 to 8, characterized in that: It also includes a connecting pipe (300) and a mounting joint (400), wherein the mounting joint (400) connects the pressure sensor (200) and the connecting pipe (300), and the connecting pipe (300) is used to be connected to the flow meter.

10. The volume corrector according to claim 9, characterized in that: It also includes a gasket (800), wherein the gasket (800) abuts between the mounting joint (400) and the pressure sensor (200).

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