Connection device and fluid flow measuring apparatus

Abstract

The application provides a connecting device and a fluid flow measuring device, comprising a connecting assembly, a first limiting piece, a second limiting piece and a locking assembly, at least a part of the first limiting piece is arranged close to a first end face; the second limiting piece is arranged close to a second end face; the first limiting piece can rotate relative to the second limiting piece around a first rotation axis parallel to a preset direction; the first limiting piece can be offset from the first end face when being at a first angle, and can be abutted against the first end face when being rotated from the first angle to a second angle; the locking assembly is arranged to lock the first limiting piece at the second angle when the first limiting piece is rotated to the second angle, and simultaneously apply an acting force to the first limiting piece and the second limiting piece respectively towards the first end face and the second end face, so that the first limiting piece and the second limiting piece are abutted against the first end face and the second end face respectively. The application is not only convenient to install, but also can solve the problem of fastener loosening.

Description

Technical Field

[0001] This invention relates to the field of connection devices, and more specifically, to a connection device and a fluid flow measurement device. Background Technology

[0002] A gas flow meter is an instrument used to measure the flow rate of gas. It is installed in a pipeline to detect the flow rate of gas passing through it. A gas flow meter generally consists of a standard installation pipe and a flow meter body. The detection probe of the flow meter body is inserted into the installation pipe and converts the flow rate into an electrical signal for output.

[0003] However, existing gas flow meters are fixed to the installation pipeline by fasteners such as screws and bolts. This structure is not only cumbersome to install and difficult for single-person operation, but also prone to loosening of fasteners (such as screws and nuts) after long-term use due to the vibration generated by the gas passing through the gas flow meter, thus affecting the sealing effect and causing air leakage. Summary of the Invention

[0004] The present invention aims to solve at least one of the technical problems existing in the prior art, and proposes a connection device and a fluid flow measurement device, which can solve the problems of troublesome installation and loose fasteners in the prior art.

[0005] To achieve the purpose of this invention, a connecting device is provided, including a connecting component, a first limiting member, a second limiting member, and a locking component, wherein the connecting component has a first end face and a second end face that are both perpendicular to a preset direction and opposite to each other;

[0006] At least a portion of the first limiting member is positioned close to the first end face;

[0007] The second limiting member is positioned close to the second end face;

[0008] The first limiting member can rotate relative to the second limiting member around a first rotation axis parallel to the preset direction; the first limiting member can be offset from the first end face when it is at a first angle, and can abut against the first end face when it rotates from the first angle to a second angle.

[0009] The locking component is configured to lock the first limiting member at the second angle when the first limiting member is rotated to the second angle, and simultaneously apply forces to the first limiting member and the second limiting member respectively toward the first end face and the second end face, so that the first limiting member and the second limiting member abut against the first end face and the second end face respectively.

[0010] In some embodiments, the connecting component further has a first channel extending along the preset direction, the first limiting member includes a connecting post passing through the first channel and a limiting portion located on the side of the connecting component near the first end face; the limiting portion is connected to one end of the connecting post; the limiting portion can pass through the first channel when it is at the first angle, and can abut against the first end face when it is rotated from the first angle to the second angle;

[0011] The locking component is located on the side of the connecting component near the second end face, and is configured to lock the limiting portion at the second angle by restricting the rotation of the connecting post when the limiting portion rotates to the second angle, while applying a tensile force along the preset direction to the connecting post so that the limiting portion abuts against the first end face, and applying a thrust along the preset direction to the second limiting member so that the second limiting member abuts against the second end face.

[0012] In some embodiments, the locking component includes an angle adjustment structure, an elastic telescopic structure, and a locking structure, wherein,

[0013] The angle adjustment structure is connected to the second limiting member and can rotate relative to the second limiting member. It is also connected to the connecting column for driving the connecting column to rotate so that the limiting part can rotate between the first angle and the second angle.

[0014] The elastic telescopic structure is elastically connected to the angle adjustment structure, and is in a stretched state when the second limiting member abuts against the second end face, so as to apply the tensile force to the connecting column through the angle adjustment structure;

[0015] The locking structure is used to restrict the rotation of the connecting column by engaging with the angle adjustment structure when the limiting part rotates to the second angle, so as to lock the limiting part at the second angle and apply the thrust to the second limiting member.

[0016] In some embodiments, the elastic telescopic structure includes a tension elastic member, the second end of which is capable of telescopic extension and retraction relative to the first end along the preset direction; the second end of the tension elastic member is connected to the angle adjustment structure.

[0017] In some embodiments, the elastic telescopic structure further includes a first guide and a second guide, wherein the first guide is fixed relative to a first end of the stretching elastic member; one end of the second guide is connected to a second end of the stretching elastic member, and the other end of the second guide is connected to the angle adjustment structure.

[0018] The first guide member and the second guide member slide in cooperation along the preset direction.

[0019] In some embodiments, the first guide member is a sleeve, the axial direction of the sleeve is parallel to the preset direction, and one end of the sleeve has an opening facing the second end face; the first end of the tensile elastic member is fixedly connected to the end inside the sleeve away from the opening;

[0020] The second guide member is a telescopic rod, the outer circumferential surface of which slides in conjunction with the inner circumferential surface of the sleeve, and one end of the telescopic rod is connected to the second end of the tension elastic member, while the other end of the telescopic rod is connected to the angle adjustment structure.

[0021] In some embodiments, the angle adjustment structure includes a first rotating member and a transmission structure, wherein the first rotating member is located on the side of the second limiting member away from the second end face and is connected to the second limiting member, and the first rotating member is capable of rotating relative to the second limiting member around a second rotation axis; the second rotation axis is parallel to the first rotation axis; and the elastic telescopic structure is elastically connected to the first rotating member.

[0022] The transmission structure is disposed on the first rotating member and is connected to the connecting column in a transmission manner, and is used to convert the power of the first rotating member rotating around the second rotation axis into the power to drive the connecting column to rotate around the first rotation axis.

[0023] In some embodiments, the transmission structure includes an internal gear disposed on the first rotating member and an external gear connected to the connecting column, wherein the axis of the internal gear coincides with the second rotation axis; the axis of the external gear coincides with the first rotation axis; and the external gear meshes with the internal gear.

[0024] In some embodiments, there are multiple first limiting members, which are spaced apart along a circumferential direction around the second rotation axis; there are multiple first channels, and the connecting posts of the multiple first limiting members are correspondingly inserted into the multiple first channels.

[0025] There are multiple external gears, and each external gear is connected to a corresponding connecting post of one of the multiple first limiting members; all of the external gears mesh with the internal gears.

[0026] In some embodiments, there are multiple elastic telescopic structures, and each of the multiple connecting columns is arranged in a circumferential direction around the second rotation axis; each elastic telescopic structure includes a tension elastic element, the first end of which is fixed relative to the second end along the preset direction; the second end of the tension elastic element is connected to the angle adjustment structure.

[0027] The locking assembly further includes a second rotating member, which is relatively fixedly mounted on the member to be connected along the preset direction and rotates relative to the member to be connected around the second rotation axis. The second rotating member is connected to the first end of the plurality of tensile elastic members.

[0028] In some embodiments, one of the opposing surfaces of the second limiting member and the first rotating member is provided with a limiting groove, and the other is provided with a limiting protrusion. The limiting protrusion and the limiting groove are engaged in a limiting engagement in a preset direction to fix the second limiting member and the first rotating member relative to each other in the preset direction, and to connect them to rotate relative to each other around the second rotation axis.

[0029] In some embodiments, both the first channel and the limiting portion are strip-shaped;

[0030] The length of the limiting part is less than the length of the first channel, and the width of the limiting part is less than the width of the first channel; when the limiting part is located at the first angle, the length direction of the limiting part is parallel to the length direction of the first channel; when the limiting part is located at the second angle, the length direction of the limiting part is perpendicular to the length direction of the first channel.

[0031] In some embodiments, the locking structure includes a fixing member, a moving member, a compression elastic member, and a limiting structure, wherein the fixing member is disposed on the side of the first rotating member away from the second limiting member, and can be relatively fixedly installed on the member to be connected;

[0032] The movable member is located between the fixed member and the first rotating member; the compression elastic member is located between the movable member and the fixed member; the limiting structure is disposed between the movable member and the first rotating member, and is used to limit the position of the movable member in the preset direction when the limiting part rotates from the first angle to the second angle, but before reaching the second angle, so that the compression elastic member is in a compressed state; when the first limiting member is at the second angle, the restriction on the movable member is released, so that the movable member, under the elastic force of the compression elastic member, applies the thrust to the second limiting member through the first rotating member; when the restriction is released, the movable member cooperates with the first rotating member to limit the rotation of the connecting column.

[0033] In some embodiments, the fixing member is provided with a second channel extending along the preset direction; the elastic telescopic structure passes through the second channel; the second channel is strip-shaped, and the length direction of the second channel extends along the circumferential direction around the second rotation axis, so that when the first rotating member rotates, the elastic telescopic structure can rotate relative to the second channel.

[0034] In some embodiments, the limiting structure includes a limiting body disposed on the first rotating member and a limiting rod disposed on the moving member, wherein the limiting body has a limiting hole on its surface facing the moving member.

[0035] During the process of the limiting part rotating from the first angle to the second angle, but not reaching the second angle, the limiting rod abuts against the surface of the limiting body facing the moving member; when the limiting part is at the second angle, the limiting rod is at least partially located in the limiting hole and is coaxially arranged.

[0036] In some embodiments, a guide groove is provided on the surface of the limiting body facing the moving member, and the limiting hole is located in the guide groove; during the process of the limiting part rotating from the first angle to the second angle, but not reaching the second angle, the end of the limiting rod away from the moving member is located in the guide groove and moves along the guide groove.

[0037] In some embodiments, the fixing member has a guide recess on its surface facing the first rotating member, the moving member is at least partially located in the guide recess, and the moving member slides in cooperation with the guide recess along the preset direction;

[0038] The compression elastic element is disposed between the surfaces of the moving element and the guide recess that are opposite to each other in the preset direction.

[0039] In some embodiments, the connecting device further includes an elastic reset component connected to the first limiting member and the second limiting member, for resetting the first limiting member to the first angle when the external force driving the first limiting member to rotate to the second angle is released.

[0040] In some embodiments, the connecting assembly includes a first flange and a second flange; the end faces of the first flange and the second flange away from each other are the first end face and the second end face, respectively; the first flange and the second flange can be respectively installed on two parts to be sealed, and a sealing ring is installed between the first flange and the second flange.

[0041] As another technical solution, the present invention also provides a fluid flow measurement device, including a measuring body, an inlet pipe for feeding fluid into the measuring body, and an outlet pipe for outputting fluid from the measuring body. The inlet pipe and the outlet pipe are respectively used to connect with two mounting pipes of the component to be measured. The device also includes the connection device provided by the present invention, wherein the gap between the inlet pipe and the mounting pipe, and / or the gap between the outlet pipe and the mounting pipe are sealed by the connection device.

[0042] The present invention has the following beneficial effects:

[0043] The connecting device provided by this invention, when the first limiting member is rotated from a first angle to a second angle, locks the first limiting member at the second angle. Simultaneously, a force is applied to the first and second limiting members located at the second angle, respectively, towards a first end face and a second end face opposite to the connecting component, causing them to abut against the first and second end faces. That is, the first and second limiting members at the second angle compress the connecting component from both sides. Thus, when the connecting component is used in a scenario where a sealing ring is installed, the first and second limiting members can compress the sealing ring in the connecting component to achieve a seal. Furthermore, during the process of installing the connecting component onto the component to be sealed using the connecting device, rotating the first limiting member to the second angle and using the locking component to compress the connecting component with the first and second limiting members achieves the installation of the connecting device. Therefore, the connecting device provided by this invention is not only easy to install and can be operated by a single person, but it can also replace fasteners such as screws and bolts, thereby solving the problem of loose fasteners, improving connection reliability, and reducing the risk of air leakage.

[0044] The fluid flow measurement device provided by this invention, by adopting the connection device provided by this invention, can not only simplify installation and enable single-person operation, but also replace fasteners such as screws and bolts, thereby solving the problem of loose fasteners, improving connection reliability, and reducing the risk of air leakage. Attached Figure Description

[0045] Figure 1 An assembly perspective view of the connecting device and the fluid flow measurement device provided in the embodiments of the present invention;

[0046] Figure 2 A front view of the assembly of the connecting device and the fluid flow measurement device provided in an embodiment of the present invention;

[0047] Figure 3 An assembly perspective view of the connecting device (excluding the connecting components) provided in an embodiment of the present invention;

[0048] Figure 4 This is an assembly perspective view of the connecting components used in an embodiment of the present invention;

[0049] Figure 5 This is a cross-sectional view of the angle adjustment structure, elastic telescopic structure, and locking structure used in the embodiments of the present invention;

[0050] Figure 6 This is a perspective view of the angle adjustment structure used in an embodiment of the present invention;

[0051] Figure 7 This is an assembly perspective view of the first limiting member, the second limiting member, and the external gear used in an embodiment of the present invention;

[0052] Figure 8 This is an assembly perspective view of the first limiting member, the second limiting member, the angle adjustment structure, the transmission structure, and the limiting body used in the embodiments of the present invention;

[0053] Figure 9 This is an assembly perspective view of the locking structure and elastic telescopic structure used in an embodiment of the present invention;

[0054] Figure 10 This is an assembly perspective view of the fixing component, moving component, limiting rod, and limiting body used in the embodiments of the present invention;

[0055] Figure 11 This is an assembly perspective view of the first limiting member, the second limiting member, and the elastic reset assembly (the protective sleeve outside the single torsion spring is not shown) used in the embodiments of the present invention. Detailed Implementation

[0056] To enable those skilled in the art to better understand the technical solution of the present invention, the connecting device and fluid flow measurement equipment provided by the present invention will be described in detail below with reference to the accompanying drawings.

[0057] The connecting device 200 provided in this embodiment of the invention can be installed at at least one location where a component to be sealed needs to be sealed. For example, please refer to [reference needed]. Figure 1 and Figure 2For a fluid flow measurement device 100, such as a gas flow meter, it includes a measuring body 101, an inlet pipe 102 for feeding fluid into the measuring body 101, and an outlet pipe 103 for outputting fluid from the measuring body 101. During installation, the inlet pipe 102 and the outlet pipe 103 are respectively connected to two mounting pipes 300 of the component to be measured and sealed. This allows fluid in the upstream mounting pipe 300 to flow into the measuring body 101 through the inlet pipe 102, then out of the measuring body 101 through the outlet pipe 103, and then into the downstream mounting pipe 300. The measuring body 101 is used to detect the flow rate of the fluid passing through it. The fluid can be gas or liquid. The connecting device 200 provided in this embodiment can be installed at the connection position between the inlet pipe 102 and the mounting pipe 300, and / or the connection position between the outlet pipe 103 and the mounting pipe 300, to achieve a seal. It should be noted that the connecting device 200 provided in this embodiment of the invention can also be applied to other structures of components to be sealed.

[0058] Please refer to the following: Figure 2 and Figure 3 The connecting device 200 provided in this embodiment of the invention includes a connecting component 210, a first limiting member 220, a second limiting member 230, and a locking component, wherein the connecting component 210 has components that are all perpendicular to a preset direction (i.e., Figure 2 The first end face A1 and the second end face A2 are opposite to each other (in the X direction). Specifically, the connecting component 210 is configured to achieve a seal when compressed on both sides along a preset direction. For example, by installing a sealing ring on the connecting component 210, the sealing ring will be compressed when the connecting component 210 is compressed, thereby achieving a seal. Of course, in practical applications, the connecting component 210 can also be configured to achieve functions such as clamping and fixing when compressed on both sides along a preset direction.

[0059] There are various ways to configure the connecting component 210 to achieve a seal when compressed on both sides along a preset direction. For some embodiments, please refer to... Figure 4 The connecting assembly 210 may include a first flange 211 and a second flange 212; the end faces of the first flange 211 and the second flange 212 away from each other are a first end face A1 and a second end face A2, respectively; the first flange 211 and the second flange 212 can be respectively installed on two parts to be sealed (e.g., Figure 1 and Figure 2 On the interlocking installation fittings 300 and inlet fittings 102, or interlocking installation fittings 300 and outlet fittings 103; a sealing ring 213 is installed between the first flange 211 and the second flange 212, which can seal the gap between the two parts to be sealed when compressed.

[0060] Specifically, the first flange 211 and the second flange 212 provide a mounting base for the sealing ring 213 and compress and fix the sealing ring 213. The sealing ring 213 surrounds the gap between the two parts to be sealed. When compressed by the first flange 211 and the second flange 212, the sealing ring 213 undergoes compression deformation to seal the gap between the first flange 211 and the second flange 212, thereby indirectly sealing the gap between the two parts to be sealed. This embodiment of the invention is not limited to using the first flange 211 and the second flange 212. In practical applications, the connecting assembly 210 can also use other structures to compress and fix the sealing ring 213. This embodiment of the invention is also not limited to using the sealing ring 213; other sealing elements fixed by compression can also be used. Furthermore, this embodiment of the invention is not limited to application in the gap between two parts to be sealed; in practical applications, it can also be applied to other locations requiring sealing.

[0061] When the connecting device 200 is used to seal the gap between two parts that are both pipes, such as Figure 4 As shown, both the first flange 211 and the second flange 212 are annular bodies, and are respectively arranged around the two parts to be sealed (e.g., Figure 1 and Figure 2 Around the interlocking end faces of the installation fittings 300 and 102 (or 300 and 103), for example, the opposing surfaces of the first flange 211 and the second flange 212 are coplanar with the interlocking end faces of the two components to be sealed, to facilitate sealing. In this case, the aforementioned preset direction is, for example, parallel to the axial direction of the fittings, and the first end face A1 and the second end face A2 are perpendicular to the axial direction of the fittings. The first flange 211 and the second flange 212 are fixedly connected to the two components to be sealed, for example, by welding.

[0062] At least a portion of the first limiting member 220 is positioned close to the first end face A1; the second limiting member 230 is positioned close to the second end face A2; that is, at least a portion of the first limiting member 220 is located on the side of the first end face A1 of the connecting assembly 210, and the second limiting member 230 is located on the side of the second end face A2 of the connecting assembly 210. Furthermore, the first limiting member 220 is rotatable relative to the second limiting member 230 around a first rotation axis O1, which is parallel to the aforementioned preset direction. When the first limiting member 220 is at a first angle, it can be offset from the first end face A1, and when rotated from the first angle to a second angle, it can abut against the first end face A1. It is easily understood that when the first limiting member 220 is at the first angle, it cannot abut against the first end face A1 because it is offset from it; that is, on the plane containing the first end face A1, the orthographic projection of the first limiting member 220 at the first angle does not coincide with the first end face A1. When the first limiting member 220 abuts against the first end face A1, the orthographic projection of the first limiting member 220 at the first angle on the plane where the first end face A1 is located partially coincides with the first end face A1. By rotating the first limiting member 220 between the first angle and the second angle, it is possible to switch between two states: offset from and abutting against the first end face A1, thereby enabling the connecting device to switch between unsealing and sealing.

[0063] Based on this, the locking assembly is configured to lock the first limiting member 220 at the second angle when the first limiting member 220 rotates to the second angle, and simultaneously apply forces to the first limiting member 220 and the second limiting member 230 respectively toward the first end face A1 and the second end face A2, so that the first limiting member 220 and the second limiting member 230 abut against the first end face A1 and the second end face A2 respectively, so that the connecting assembly 210 achieves a seal due to compression. That is, the first limiting member 220 and the second limiting member 230 located at the second angle compress the connecting assembly 210 on both sides, so that the connecting assembly 210 (including, for example, the sealing ring 213) achieves a seal due to compression.

[0064] Thus, during the installation of the connecting device 200 onto the component to be sealed, the first limiting member 220 is rotated from a first angle to a second angle, and the first limiting member 220 and the second limiting member 230 are pressed against the connecting component 210 by the locking assembly, thereby achieving the installation of the connecting device 200. Therefore, the connecting device 200 provided in this embodiment of the invention is not only easy to install and can be operated by a single person without the need for any external tools, saving a lot of time and effort, but it can also replace fasteners such as screws and bolts, thereby solving the problem of fastener loosening, improving connection reliability, and reducing the risk of air leakage.

[0065] In some embodiments, such as Figure 4As shown, the connecting assembly 210 also has a first channel 214 extending along a preset direction. In an embodiment where the connecting assembly 210 includes a first flange 211 and a second flange 212, the first channel 214 is composed of through holes that sequentially extend through the first flange 211 and the second flange 212 along a preset direction. When a sealing ring 213 is installed between the first flange 211 and the second flange 212, the sealing ring 213 may or may not have a corresponding through hole. Figure 3 As shown, the first limiting member 220 includes a connecting post 222 passing through the first channel 214 and a limiting portion 221 located on the side of the connecting assembly 210 near the first end face A1; the limiting portion 221 is connected to one end of the connecting post 222; the limiting portion 221 can pass through the first channel 214 when it is at a first angle, and can abut against the first end face A1 when it rotates from the first angle to a second angle. The locking assembly is located on the side of the connecting assembly 210 near the second end face A2, and is configured to lock the limiting portion 221 at the second angle by restricting the rotation of the connecting post 222 when the limiting portion 221 rotates to the second angle, while applying a pulling force in a preset direction to the connecting post 222 so that the limiting portion 221 abuts against the first end face A1, and applying a pushing force in a preset direction to the second limiting member 230 so that the second limiting member 230 abuts against the second end face A2. With the help of the limiting part 221 and the connecting post 222, the locking component can apply a pulling force and a pushing force to the two components (i.e., the connecting post 222 and the second limiting member 230) on one side of the connecting component 210, thereby realizing the compression of the connecting component 210 by the limiting part 221 and the second limiting member 230 located at the second angle.

[0066] In some embodiments, the orthographic projections of the first channel 214 and the limiting part 221 on the first end face A1 are both strip-shaped; the length of the orthographic projection of the limiting part 221 on the first end face A1 is less than the length of the orthographic projection of the first channel 214 on the first end face A1, and the width of the orthographic projection of the limiting part 221 on the first end face A1 is less than the width of the orthographic projection of the first channel 214 on the first end face A1; when the limiting part 221 is located at a first angle, the length direction of the orthographic projection of the limiting part 221 on the first end face A1 is parallel to the length direction of the orthographic projection of the first channel 214 on the first end face A1, and the limiting part 221 can pass through the first channel 214; when the limiting part 221 is located at a second angle, the length direction of the orthographic projection of the limiting part 221 on the first end face A1 is set at an angle to the length direction of the orthographic projection of the first channel 214 on the first end face A1, preferably, they are set to be perpendicular to each other, and the limiting part 221 cannot pass through the first channel 214, so that the first limiting member 220 can abut against the first end face A1.

[0067] It should be noted that the first channel 214 is strip-shaped, meaning that the distance between the outline of the cross-sectional shape of the first channel 214 perpendicular to the preset direction (i.e., the orthographic projection shape on the first end face A1) and its center varies in the circumferential direction. The direction in which this distance is at its maximum value is the length direction, and the direction in which this distance is at its minimum value is the width direction. Similarly, the limiting part 221 is strip-shaped, meaning that the distance between the outline of the cross-sectional shape of the limiting part 221 perpendicular to the preset direction and its center varies in the circumferential direction. The direction in which this distance is at its maximum value is the length direction, and the direction in which this distance is at its minimum value is the width direction. The cross-sectional shape of the first channel 214 matches the cross-sectional shape of the limiting part 221, for example, both being oblong.

[0068] The locking component that implements the above functions can have various structures, such as... Figure 2 and Figure 3 As shown, the locking assembly includes an angle adjustment structure 240, an elastic telescopic structure 250, and a locking structure 260. The angle adjustment structure 240 is connected to the second limiting member 230 and is rotatable relative to the second limiting member 230. It is also connected to the connecting post 222 to drive the connecting post 222 to rotate, allowing the limiting part 221 to rotate between a first angle and a second angle. The elastic telescopic structure 250 is elastically connected to the angle adjustment structure 240 and is in a stretched state when the second limiting member 230 abuts against the second end face A2, so that a tensile force is applied to the connecting post 222 through the angle adjustment structure 240. In other words, when the second limiting member 230 moves to the position abutting against the second end face A2, the limiting part 221 at the first angle moves through the first channel 214 to the side of the connecting assembly 210 located on the first end face A1. Simultaneously, the angle adjustment structure 240 connected to the second limiting member 230 moves towards the second end face A2 along with the second limiting member 230, causing the elastic telescopic structure 250 to be stretched. This applies a pulling force to the angle adjustment structure 240 in a direction away from the second end face A2. Under the action of this pulling force, the connecting column 222, which is drivenly connected to the angle adjustment structure 240, always maintains a tendency to move towards the first end face A1. This allows the limiting part 221 to remain abutting against the first end face A1 when the limiting part 221 is at the second angle. The locking structure 260 is used to restrict the rotation of the connecting column 222 by engaging with the angle adjustment structure 240 when the limiting part 221 rotates to the second angle, thereby locking the limiting part 221 at the second angle and simultaneously applying a pushing force to the second limiting member 230.

[0069] When installing the connecting device 200, the second limiting member 230 is installed onto the part to be sealed (e.g., Figure 1 and Figure 2The inlet pipe 102 or outlet pipe 103 is driven by the second limiting member 230 to move to a position abutting against the second end face A2, during which the limiting part 221 is located at the first angle and, driven by the second limiting member 230, moves through the first channel 214 to the side of the connecting assembly 210 located on the first end face A1. The second limiting member 230 is held at the position abutting against the second end face A2 by manual or motor (automatic control), at which time the elastic telescopic structure 250 is in a stretched state; then, the angle adjusting structure 240 is driven to rotate by manual or motor (automatic control) to drive the connecting column 222 and the limiting part 221 connected to it to rotate around the first rotation axis O1 until the limiting part 221 rotates to the second angle, at which time the limiting part 221 abuts against the first end face A1. Simultaneously, the locking structure 260 engages with the angle adjustment structure 240 to limit the rotation of the connecting column 222, locking the limiting part 221 at the second angle. That is, while the limiting part 221 rotates to the second angle, the locking structure 260 locks the limiting part 221, preventing it from rotating. Under the tension of the elastic telescopic structure 250, the limiting part 221 can remain in a position abutting against the first end face A1. At the same time, the locking structure 260 applies a pushing force to the second limiting member 230, which balances the aforementioned tension force. At this point, even if the external force (manual or motor-generated) is removed, the second limiting member 230 can remain in a position abutting against the second end face A2, thereby enabling the limiting part 221 and the second limiting member 230 to compress the connecting assembly 210.

[0070] The elastic telescopic structure 250 that achieves the above functions can be of various types, for example, please refer to [link to relevant documentation]. Figure 5 The elastic telescopic structure 250 includes a tension elastic member 251, the second end of which ( Figure 5 The left end of the middle can be relative to the first end ( Figure 5 (right end of) along the preset direction ( Figure 5 The tension elastic member 251 extends and retracts in the X direction; the second end of the tension elastic member 251 is connected to the angle adjustment structure 240. Because the tension elastic member 251 is elastic, when it is in a stretched state, it applies a spring force to the second limiting member 230 through the angle adjustment structure 240, causing it to move away from the second end face A2. Since the limiting part 221 is located on the opposite side of the second limiting member 230, the limiting part 221 experiences a spring force close to the first end face A1. The tension elastic member 251 is, for example, a tension spring.

[0071] Based on this, in order to ensure that the elastic telescopic structure 250 expands and contracts along a preset direction, in some embodiments, such as Figure 3 and Figure 5As shown, the elastic telescopic structure 250 also includes a first guide member 252 and a second guide member 253. The first guide member 252 is fixed relative to the first end of the tensile elastic member 251, for example, the first guide member 252 is fixedly connected to the first end of the tensile elastic member 251. One end of the second guide member 253 is connected to the second end of the tensile elastic member 251, and the other end of the second guide member 253 is connected to the angle adjustment structure 240. That is, the second end of the tensile elastic member 251 is connected to the angle adjustment structure 240 through the second guide member 253. Furthermore, the first guide member 252 and the second guide member 253 slide in a preset direction so that the second guide member 253 moves relative to the first guide member 252 in a preset direction when the tensile elastic member 251 extends or retracts, thereby ensuring that the elastic telescopic structure 250 extends or retracts in the preset direction.

[0072] The first guide member 252 and the second guide member 253 that achieve the above functions can have various structures. For example, the first guide member 252 can be a sleeve, the axis of which is parallel to a preset direction, and one end of the sleeve (i.e. Figure 5 The left end of the sleeve has an opening facing the second end face A2; the first end of the tension elastic element 251 is located at the end of the sleeve that is furthest from the opening (i.e., the left end of the sleeve). Figure 5 The right end of the sleeve (which may be closed) is fixedly connected; the second guide member 253 is a telescopic rod, the outer circumferential surface of which slides against the inner circumferential surface of the sleeve, and one end of the telescopic rod is connected to the second end of the tension elastic member 251, while the other end is connected to the angle adjustment structure 240. Further, in some embodiments, the end of the sleeve furthest from the opening can be rotatably mounted to the element to be sealed (e.g., [missing information]) via the second rotating member 254. Figure 1 and Figure 2 The inlet pipe 102 or outlet pipe 103 in the middle, the rotation center line (i.e. the second rotation axis O2) of the second rotating member 254 is coaxially arranged with the rotation center line of the angle adjustment structure 240. In this way, based on the second rotating member 254 providing support for the sleeve and the tensile elastic member 251, the sleeve and the tensile elastic member 251 can rotate with the angle adjustment structure 240, so that the tensile elastic member 251 and the angle adjustment structure 240 can remain connected when the angle adjustment structure 240 rotates.

[0073] In some embodiments, the angle adjustment structure 240 rotates around a second rotation axis O2, which is parallel to the first rotation axis O1, i.e., parallel to a preset direction. Multiple first limiting members 220 are distributed at intervals along the circumferential direction around the second rotation axis O2; and multiple first channels 214 are provided, with connecting posts 222 of the multiple first limiting members 220 correspondingly passing through the multiple first channels 214 and all being drively connected to the angle adjustment structure 240. In this case, the angle adjustment structure 240 is configured to drive the multiple connecting posts 222 to rotate synchronously around their respective first rotation axes O1 when rotating around the second rotation axis O2, so that the multiple limiting parts 221 can rotate synchronously from a first angle to a second angle. The embodiment where multiple first limiting members 220 are distributed at intervals along the circumferential direction around the second rotation axis O2 is particularly suitable for cases where the object to be sealed is a pipe. Specifically, when the connecting device 200 is used to seal the gap between two objects to be sealed, both of which are pipes, the aforementioned second rotation axis O2 is coaxial with the axis of the pipe. In this case, multiple first limiting members 220 can be spaced apart around the sealing ring 213, so that the sealing ring 213 can be uniformly squeezed in the circumferential direction, thereby making the sealing ring 213 uniformly stressed and thus improving the sealing effect.

[0074] Based on this, the angle adjustment structure 240 is, for example, annular, with its axis being the second rotation axis O2, so that it can be arranged around the pipe fitting; there are multiple elastic telescopic structures 250, which are distributed at intervals around the second rotation axis O2 in the circumferential direction, and each elastic telescopic structure 250 is elastically connected to the angle adjustment structure 240. The multiple elastic telescopic structures 250 can apply tension evenly in the circumferential direction of the angle adjustment structure 240, thereby making the angle adjustment structure 240 uniformly stressed.

[0075] Furthermore, in embodiments where the elastic telescopic structure 250 also includes first guide members 252 and second guide members 253, there are multiple first guide members 252, each fixedly connected to a first end of a plurality of tensile elastic members 251; there are multiple second guide members 253, each slidingly engaged with a plurality of first guide members 252 along a preset direction; one end of each of the multiple second guide members 253 is connected to a second end of a plurality of tensile elastic members 251; and the other end of each of the multiple second guide members 253 is connected to an angle adjustment structure 240. Based on this, the second rotating member 254 is annular and can be relatively fixedly installed on the part to be sealed (pipe) along a preset direction, and can rotate relative to the part to be sealed around a second rotation axis O2. The second rotating member 254 is installed on the part to be sealed (pipe) for example through a bearing structure, which can limit the position of the second rotating member 254 in the preset direction and allow it to rotate relative to the part to be sealed around a second rotation axis O2.

[0076] The angle adjustment structure 240 that achieves the above functions can be of various types, for example, such as Figure 5 and Figure 6 As shown, the angle adjustment structure 240 includes a first rotating member 241 and a transmission structure. The first rotating member 241 is located on the side of the second limiting member 230 away from the second end face A2 and is connected to the second limiting member 230. The first rotating member 241 can rotate relative to the second limiting member 230 around the second rotation axis O2. The second rotation axis O2 is parallel to the first rotation axis O1. The elastic telescopic structure 250 (e.g., the second guide member 252) is elastically connected to the first rotating member 241. The transmission structure is disposed on the first rotating member 241 and is connected to the connecting column 222 for transmitting the power of the first rotating member 241 rotating around the second rotation axis O2 into the power of the connecting column 222 rotating around the first rotation axis O1.

[0077] When the connecting device 200 is used to seal the gap between two parts that are both pipes, the second limiting member 230 is annular and surrounds the part to be sealed (pipe); the first rotating member 241 is annular and surrounds the part to be sealed (pipe) and is located on the side of the second limiting member 230 away from the second end face A2.

[0078] In some embodiments, the first rotating member 241 is rotatable relative to the second limiting member 230 about the second rotation axis O2 in such a way as follows: one of the opposing surfaces of the second limiting member 230 and the first rotating member 241 is provided with a limiting groove 231 (e.g., Figure 7 As shown), the other is provided with a limiting protrusion 242a (as shown). Figure 5 As shown), the limiting protrusion 242a and the limiting groove 231 are engaged in a limiting direction to fix the second limiting member 230 and the first rotating member 241 relatively in the preset direction, and to allow them to rotate relative to each other around the second rotation axis O2. In a specific embodiment, as... Figure 5 and Figure 6 As shown, a limiting ring 242 is provided on the side of the first rotating member 241 facing the second limiting member 230, and the aforementioned limiting protrusion 242a is an annular protrusion formed on the outer peripheral surface of the limiting ring 242.

[0079] The specific way in which the limiting protrusion 242a and the limiting groove 231 are engaged in a limiting position in a preset direction is as follows: both the limiting protrusion 242a and the limiting groove 231 are annular, and their axes are coaxial with the first rotation axis O1; and the outer peripheral surface of the limiting protrusion 242a is clearance-fitted with the circumferential side surface of the limiting groove 231, and both are conical annular surfaces (smallest size at the groove opening) or stepped annular surfaces (smallest size at the groove opening) to restrict the limiting protrusion 242a in the limiting groove 231, and fix the second limiting member 230 and the first rotating member 241 relative to each other in a preset direction, and the two can rotate relative to each other around the second rotation axis O2.

[0080] There are various transmission structures that can achieve the above functions, for example, such as Figures 6 to 8 As shown, the transmission structure includes an internal gear 243 mounted on the first rotating member 241 and an external gear 244 connected to the connecting column 222. The axis of the internal gear 243 coincides with the second rotation axis O2; the axis of the external gear 244 coincides with the first rotation axis O1; and the external gear 244 meshes with the internal gear 243. Specifically, the transmission structure formed by the internal gear 243 and the external gear 244 is an internal meshing structure, where the teeth of the internal gear 243 are on the inner circle, and the teeth of the external gear 244 are on the outer circle. When the first rotating member 241 rotates around the second rotation axis O2, it drives the internal gear 243 mounted on it to rotate around the second rotation axis O2. Under the action of the meshing of the external gear 244 and the internal gear 243, the external gear 244 rotates around the first rotation axis O1, thereby driving the connecting column 222 to rotate around the first rotation axis O1, thus enabling the limiting part 221 to rotate between a first angle and a second angle. Specifically, the connecting post 222 rotatably passes through the second limiting member 230 and is fixedly connected to the external gear 244, and the connecting post 222 and the external gear 244 are coaxial. The first rotating member 241 is provided with a groove extending along its thickness on the side opposite to the first limiting member 220, and the internal gear 243 is disposed on the inner circumferential surface of the groove; the external gear 244 is at least partially located in the groove and meshes with the internal gear 243.

[0081] In embodiments where there are multiple first limiting members 220, there are multiple external gears 244, each corresponding to a connecting post 222 of the multiple first limiting members 220; all external gears 244 mesh with internal gears 243. Under the action of the multiple external gears 244 meshing with the internal gears 243, the multiple external gears 244 will rotate around the first rotation axis O1, thereby driving the multiple connecting posts 222 to rotate around their respective first rotation axes O1, thus realizing the synchronous rotation of the multiple limiting parts 221 between the first angle and the second angle.

[0082] There are various locking structures 260 that can achieve the above functions; for example, please refer to [the document / reference]. Figures 6 to 10The locking structure 260 includes a fixing member 261, a moving member 262, a compression elastic member 263, and a limiting structure. The fixing member 261 is located on the side of the first rotating member 241 away from the second limiting member 230 and can be relatively fixedly installed on the part to be sealed (e.g., Figure 1 and Figure 2 The inlet pipe 102 or outlet pipe 103 is used, that is, there is no relative movement between the fixed member 261 and the member to be sealed; the movable member 262 is located between the fixed member 261 and the first rotating member 241; the compression elastic member 263 is located between the movable member 262 and the fixed member 261; the limiting structure is provided between the movable member 262 and the first rotating member 241, and is used to limit the position of the movable member 262 in a preset direction during the process of the limiting part 221 rotating from the first angle to the second angle, so that the compression elastic member 263 is in a compressed state; when the first limiting member 220 is located at the second angle, the restriction on the movable member 262 is released, so that the movable member 262, under the elastic force of the compression elastic member 263, applies a thrust to the second limiting member 230 through the first rotating member 241; when the position restriction in the preset direction is released, the movable member 262 cooperates with the first rotating member 241 to limit the rotation of the connecting column 222.

[0083] When the connecting device 200 is used to seal the gap between two parts that are both pipes, the fixing member 261 is, for example, annular and surrounds the pipes, and can be relatively fixedly installed on the parts to be sealed (e.g. Figure 1 and Figure 2 The inlet pipe 102 or outlet pipe 103 is installed by welding or fasteners. There is no relative movement between the fixing member 261 and the part to be sealed; specifically, there is no relative movement or rotation between the fixing member 261 and the part to be sealed in a preset direction. The moving member 262 is annular and surrounds the pipe, and is elastically connected to the fixing member 261 via a compression elastic member 263. The moving member 262 can move relative to the fixing member 261 in a preset direction to move closer to or further away from the first rotating member 241. The compression elastic member 263 includes, for example, at least one compression spring. In one specific embodiment, there are multiple compression springs, spaced apart circumferentially along the moving member 262, to ensure uniform force distribution on the moving member 262.

[0084] During the rotation of the limiting part 221 from the first angle to the second angle, before reaching the second angle, the limiting structure restricts the position of the moving part 262 in the preset direction, thereby keeping the compression elastic member 263 in a compressed state. This allows the moving part 262 to always tend to move towards the first rotating member 241 towards the second end face A2. When the first limiting member 220 reaches the second angle, the limiting structure releases the restriction on the position of the moving part 262 in the preset direction. At this time, under the elastic force of the compression elastic member 263, the moving part 262 applies a pushing force to the second limiting member 230 through the first rotating member 241. When this pushing force is balanced with the tension provided by the elastic telescopic structure 250, the second limiting member 230 can be kept in a position abutting against the second end face A2. At the same time, when the moving part 262 is released from restriction, it cooperates with the first rotating member 241 to limit the rotation of the connecting column 222, thereby locking the limiting part 221 at the second angle, that is, keeping it in a position abutting against the first end face A1.

[0085] In some embodiments, such as Figure 9 As shown, the fixing member 261 is provided with a second channel 261a extending in a preset direction; the elastic telescopic structure 250 (e.g., the second guide member 253) passes through the second channel 261a; the second channel 261a is strip-shaped, and its length extends along the circumference around the second rotation axis O2, so that when the first rotating member 241 rotates, the elastic telescopic structure 250 can rotate relative to the second channel 261a, while ensuring that the tension elastic member 251 and the first rotating member 241 can remain connected. The length of the second channel 261a should meet the rotation angle range of the elastic telescopic structure 250.

[0086] There are various types of limit structures that can achieve the above functions, for example, such as Figures 5 to 10 As shown, the limiting structure includes a limiting body 264 disposed on the first rotating member 241 and a limiting rod 262a disposed on the moving member 262. The limiting body 264 has a limiting hole 264a on its surface facing the moving member 262. During the rotation of the limiting part 221 from a first angle to a second angle, but before reaching the second angle, the limiting rod 262a abuts against the surface of the limiting body 264 facing the moving member 262. When the limiting part 221 is at the second angle, the limiting rod 262a is at least partially located in the limiting hole 264a and is coaxially disposed. When the limiting rod 262a extends at least partially into the limiting hole 264a, the rotation of the first rotating member 241 can be restricted by the limiting cooperation between the limiting rod 262a and the limiting hole 264a.

[0087] In embodiments where the transmission structure includes an internal gear 243 and an external gear 244, the limiting body 264 is, for example, block-shaped and disposed on the side of the first rotating member 241 opposite to the first limiting member 220, located inside the circumference of the internal gear 243, and offset from the external gear 244. Furthermore, to ensure uniform force distribution on the first rotating member 241, multiple limiting structures are provided, spaced apart circumferentially along the first rotating member 241. These multiple limiting structures are offset from the multiple external gears 244 in a one-to-one circumferential direction.

[0088] Furthermore, in some embodiments, in order to enable the limiting rod 262a to move accurately into the limiting hole 264a, a guide groove 264b is provided on the surface of the limiting body 264 facing the moving member 262, and the limiting hole 264a is located in the guide groove 264b. During the process of the limiting part 221 rotating from the first angle to the second angle, but before reaching the second angle, the end of the limiting rod 262a away from the moving member 262 is located in the guide groove 264b and moves along the guide groove 264b.

[0089] In some embodiments, such as Figure 5 As shown, in order to enable the movable member 262 to move in a preset direction, the fixed member 261 is provided with a guide recess 261a on the surface facing the first rotating member 241, the movable member 262 is at least partially located in the guide recess 261a, and the movable member 262 and the guide recess 261a slide in a preset direction; the compression elastic member 263 is disposed between the surfaces of the movable member 262 and the guide recess 261a that are opposite to each other in the preset direction.

[0090] In some embodiments, the connecting device 200 further includes an elastic reset component connected to the first limiting member 220 and the second limiting member 230, for resetting the first limiting member 220 to the first angle when the external force driving the first limiting member 220 to rotate to the second angle is released. In a specific embodiment, such as Figure 11As shown, the elastic reset assembly includes, for example, a torsion spring 224, which is sleeved on the connecting post 222. One end of the torsion spring 224 is fixedly connected to the second limiting member 230, and the other end is fixedly connected to the connecting post 222. When the connecting post 222 is at the first angle, the torsion spring 224 is in its original state. When the connecting post 222 rotates from the first angle to the second angle, the torsion spring 224 is in a torsional deformation state, thereby applying an elastic force to the connecting post 222 to reset it to the first angle. When the limiting rod 262a is moved out of the limiting hole 264a by external force, the connecting post 222 rotates under the elastic force of the torsion spring 224, thereby driving the limiting part 221 to rotate to the first angle. At the same time, the first rotating member 241 rotates under the meshing action of the external gear 244 and the internal gear 243 connected to the connecting post 222, so that the limiting hole 264a rotates away from the limiting rod 262a, so that the limiting rod 262a abuts against the surface of the moving member 262 of the limiting body 264 again. Thus, the connecting device 200 can be removed from the part to be sealed. In addition, in order to protect the torsion spring 224, a protective sleeve 223 is fitted around the torsion spring 224.

[0091] In summary, the connecting device 200 provided in this embodiment of the invention, when the first limiting member 220 is rotated from a first angle to a second angle, the locking component locks the first limiting member 220 at the second angle. Simultaneously, it applies elastic forces to the first limiting member 220 and the second limiting member 230 located at the second angle, respectively, towards the first end face A1 and the second end face A2 opposite to the connecting assembly 210, causing them to abut against the first end face A1 and the second end face A2, respectively. That is, the first limiting member 220 and the second limiting member 230 located at the second angle press against the connecting assembly 210 from both sides. Thus, when the connecting assembly 210 is used in a scenario where a sealing ring 213 is installed, the first limiting member 220 and the second limiting member 230 can press against the sealing ring 213 in the connecting assembly 210 to achieve sealing of the component to be sealed. Furthermore, during the process of installing the connecting assembly 210 onto the part to be sealed using the connecting device, the first limiting member 220 is rotated to the second angle, and the first limiting member 220 and the second limiting member 230 are pressed against the connecting assembly 210 by the locking assembly, thereby realizing the installation of the connecting device 200. Therefore, the connecting device 200 provided by the present invention is not only easy to install and can be operated by a single person, but it can also replace fasteners such as screws and bolts, thereby solving the problem of fastener loosening, improving connection reliability, and reducing the risk of air leakage.

[0092] As another technical solution, this embodiment of the invention provides a fluid flow measurement device, including a measuring body 101, an inlet pipe 102 for feeding fluid into the measuring body 101, and an outlet pipe 103 for outputting fluid from the measuring body 101. The inlet pipe 102 and the outlet pipe 103 are respectively connected to two mounting pipes of the component to be measured. The device also includes the connection device 200 provided in this embodiment of the invention. The gap between the inlet pipe 102 and the mounting pipe, and / or the gap between the outlet pipe 103 and the mounting pipe are sealed by the connection device 200.

[0093] For example, a fluid flow measurement device, such as a gas flow meter, includes a measuring body 101, an inlet pipe 102 for feeding fluid into the measuring body 101, and an outlet pipe 103 for outputting fluid from the measuring body 101. During installation, the inlet pipe 102 and the outlet pipe 103 are respectively connected to two mounting pipes (i.e., the parts to be sealed) of the component to be measured, and sealed. This allows fluid in the upstream mounting pipe to flow into the measuring body 101 through the inlet pipe 102, then out of the measuring body 101 through the outlet pipe 103, and then into the downstream mounting pipe. The measuring body 101 is used to detect the flow rate of the fluid passing through it. The fluid can be gas or liquid. The connecting device 200 provided in this embodiment can be installed at the connection position between the inlet pipe 102 and the mounting pipe, and / or the connection position between the outlet pipe 103 and the mounting pipe to achieve a seal. It should be noted that the connecting device 200 provided in this embodiment can also be applied to other structures of parts to be sealed.

[0094] The fluid flow measurement device provided in this embodiment of the invention, by adopting the connection device 200 provided in this embodiment of the invention, can not only simplify installation and enable single-person operation, but also replace fasteners such as screws and bolts, thereby solving the problem of fastener loosening, improving connection reliability, and reducing the risk of air leakage.

[0095] It is understood that the above embodiments are merely exemplary implementations used to illustrate the principles of the present invention, and the present invention is not limited thereto. For those skilled in the art, various modifications and improvements can be made without departing from the spirit and essence of the present invention, and these modifications and improvements are also considered to be within the scope of protection of the present invention.

Claims

1. A connecting device, characterized in that, It includes a connecting component, a first limiting member, a second limiting member, and a locking component, wherein the connecting component has a first end face and a second end face that are both perpendicular to a preset direction and opposite to each other; At least a portion of the first limiting member is positioned close to the first end face; The second limiting member is positioned close to the second end face; The first limiting member can rotate relative to the second limiting member around a first rotation axis parallel to the preset direction; the first limiting member can be offset from the first end face when it is at a first angle, and can abut against the first end face when it rotates from the first angle to a second angle. The locking component is configured to lock the first limiting member at the second angle when the first limiting member is rotated to the second angle, and simultaneously apply forces to the first limiting member and the second limiting member respectively toward the first end face and the second end face, so that the first limiting member and the second limiting member abut against the first end face and the second end face respectively.

2. The connecting device according to claim 1, characterized in that, The connecting component also has a first channel extending along the preset direction. The first limiting member includes a connecting post passing through the first channel and a limiting part located on the side of the connecting component near the first end face. The limiting part is connected to one end of the connecting post. The limiting part can pass through the first channel when it is at the first angle, and can abut against the first end face when it is rotated from the first angle to the second angle. The locking component is located on the side of the connecting component near the second end face, and is configured to lock the limiting portion at the second angle by restricting the rotation of the connecting post when the limiting portion rotates to the second angle, while applying a tensile force along the preset direction to the connecting post so that the limiting portion abuts against the first end face, and applying a thrust along the preset direction to the second limiting member so that the second limiting member abuts against the second end face.

3. The connecting device according to claim 2, characterized in that, The locking component includes an angle adjustment structure, an elastic telescopic structure, and a locking structure, wherein... The angle adjustment structure is connected to the second limiting member and can rotate relative to the second limiting member. It is also connected to the connecting column for driving the connecting column to rotate so that the limiting part can rotate between the first angle and the second angle. The elastic telescopic structure is elastically connected to the angle adjustment structure, and is in a stretched state when the second limiting member abuts against the second end face, so as to apply the tensile force to the connecting column through the angle adjustment structure; The locking structure is used to restrict the rotation of the connecting column by engaging with the angle adjustment structure when the limiting part rotates to the second angle, so as to lock the limiting part at the second angle and apply the thrust to the second limiting member.

4. The connecting device according to claim 3, characterized in that, The elastic telescopic structure includes a tension elastic element, the second end of which is capable of telescopic extension and retraction relative to the first end along the preset direction; the second end of the tension elastic element is connected to the angle adjustment structure.

5. The connecting device according to claim 4, characterized in that, The elastic telescopic structure further includes a first guide member and a second guide member. The first guide member is fixed relative to the first end of the stretching elastic member. One end of the second guide member is connected to the second end of the stretching elastic member, and the other end of the second guide member is connected to the angle adjustment structure. The first guide member and the second guide member slide in cooperation along the preset direction.

6. The connecting device according to claim 5, characterized in that, The first guide member is a sleeve, the axial direction of the sleeve is parallel to the preset direction, and one end of the sleeve has an opening facing the second end face; the first end of the tensile elastic member is fixedly connected to the end of the sleeve inside that is away from the opening. The second guide member is a telescopic rod, the outer circumferential surface of which slides in conjunction with the inner circumferential surface of the sleeve, and one end of the telescopic rod is connected to the second end of the tension elastic member, while the other end of the telescopic rod is connected to the angle adjustment structure.

7. The connecting device according to any one of claims 3-6, characterized in that, The angle adjustment structure includes a first rotating member and a transmission structure. The first rotating member is located on the side of the second limiting member away from the second end face and is connected to the second limiting member. The first rotating member can rotate relative to the second limiting member around a second rotation axis. The second rotation axis is parallel to the first rotation axis. The elastic telescopic structure is elastically connected to the first rotating member. The transmission structure is disposed on the first rotating member and is connected to the connecting column in a transmission manner, and is used to convert the power of the first rotating member rotating around the second rotation axis into the power to drive the connecting column to rotate around the first rotation axis.

8. The connecting device according to claim 7, characterized in that, The transmission structure includes an internal gear disposed on the first rotating member and an external gear connected to the connecting column, wherein the axis of the internal gear coincides with the second rotation axis; the axis of the external gear coincides with the first rotation axis; and the external gear meshes with the internal gear.

9. The connecting device according to claim 8, characterized in that, There are multiple first limiting members, which are spaced apart along the circumferential direction around the second rotation axis; there are multiple first channels, and the connecting posts of the multiple first limiting members are correspondingly inserted into the multiple first channels. There are multiple external gears, and each external gear is connected to a corresponding connecting post of one of the multiple first limiting members; all of the external gears mesh with the internal gears.

10. The connecting device according to claim 9, characterized in that, The elastic telescopic structure comprises multiple structures, each corresponding to one of the multiple connecting columns along the circumferential direction around the second rotation axis; each elastic telescopic structure includes a tension elastic element, the first end of which is fixed relative to the second end along the preset direction; the second end of the tension elastic element is connected to the angle adjustment structure. The locking assembly further includes a second rotating member, which is relatively fixedly mounted on the member to be connected along the preset direction and rotates relative to the member to be connected around the second rotation axis. The second rotating member is connected to the first end of the plurality of tensile elastic members.

11. The connecting device according to claim 7, characterized in that, One of the surfaces of the second limiting member and the first rotating member facing each other is provided with a limiting groove, and the other is provided with a limiting protrusion. The limiting protrusion and the limiting groove are engaged in a limiting engagement in a preset direction to fix the second limiting member and the first rotating member relative to each other in the preset direction, and to connect them to rotate relative to each other around the second rotation axis.

12. The connecting device according to claim 2, characterized in that, Both the first channel and the limiting part are strip-shaped; The length of the limiting part is less than the length of the first channel, and the width of the limiting part is less than the width of the first channel; when the limiting part is located at the first angle, the length direction of the limiting part is parallel to the length direction of the first channel; when the limiting part is located at the second angle, the length direction of the limiting part is perpendicular to the length direction of the first channel.

13. The connecting device according to claim 7, characterized in that, The locking structure includes a fixing member, a moving member, a compression elastic member, and a limiting structure, wherein the fixing member is disposed on the side of the first rotating member away from the second limiting member, and can be relatively fixedly installed on the member to be connected; The movable member is located between the fixed member and the first rotating member; the compression elastic member is located between the movable member and the fixed member; the limiting structure is disposed between the movable member and the first rotating member, and is used to limit the position of the movable member in the preset direction when the limiting part rotates from the first angle to the second angle, but before reaching the second angle, so that the compression elastic member is in a compressed state; when the first limiting member is at the second angle, the restriction on the movable member is released, so that the movable member, under the elastic force of the compression elastic member, applies the thrust to the second limiting member through the first rotating member; when the restriction is released, the movable member cooperates with the first rotating member to limit the rotation of the connecting column.

14. The connecting device according to claim 13, characterized in that, The fixing member is provided with a second channel that runs through the preset direction; the elastic telescopic structure passes through the second channel; the second channel is strip-shaped, and the length direction of the second channel extends along the circumferential direction around the second rotation axis, so that when the first rotating member rotates, the elastic telescopic structure can rotate relative to the second channel.

15. The connecting device according to claim 13, characterized in that, The limiting structure includes a limiting body disposed on the first rotating member and a limiting rod disposed on the moving member, wherein the limiting body has a limiting hole on its surface facing the moving member. During the process of the limiting part rotating from the first angle to the second angle, but not reaching the second angle, the limiting rod abuts against the surface of the limiting body facing the moving member; when the limiting part is at the second angle, the limiting rod is at least partially located in the limiting hole and is coaxially arranged.

16. The connecting device according to claim 15, characterized in that, The limiting body has a guide groove on its surface facing the moving member, and the limiting hole is located in the guide groove; when the limiting part rotates from the first angle to the second angle, but does not reach the second angle, the end of the limiting rod away from the moving member is located in the guide groove and moves along the guide groove.

17. The connecting device according to claim 13, characterized in that, The fixing member has a guide recess on its surface facing the first rotating member, the moving member is at least partially located in the guide recess, and the moving member slides in cooperation with the guide recess along the preset direction; The compression elastic element is disposed between the surfaces of the moving element and the guide recess that are opposite to each other in the preset direction.

18. The connecting device according to claim 1, characterized in that, The connecting device further includes an elastic reset component, which is connected to the first limiting member and the second limiting member, and is used to drive the first limiting member to reset to the first angle when the external force that drives the first limiting member to rotate to the second angle is released.

19. The connecting device according to claim 1, characterized in that, The connecting assembly includes a first flange and a second flange; the end faces of the first flange and the second flange away from each other are the first end face and the second end face, respectively; the first flange and the second flange can be respectively installed on two parts to be sealed, and a sealing ring is installed between the first flange and the second flange.

20. A fluid flow measurement device, comprising a measuring body, an inlet pipe for feeding fluid into the measuring body, and an outlet pipe for outputting fluid from the measuring body, wherein the inlet pipe and the outlet pipe are respectively used to connect with two mounting pipes of a component to be measured, characterized in that, It also includes the connecting device as described in any one of claims 1-19, wherein the gap between the inlet pipe and the mounting pipe, and / or the gap between the outlet pipe and the mounting pipe is sealed by the connecting device.

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