Liquid injection clamp and flow detection device

Abstract

The invention belongs to the technical field of positioning clamps, and discloses a liquid injection clamp and a flow detection device. The liquid injection clamp comprises at least two clamping units, and each clamping unit comprises a first clamping piece, a second clamping piece and a first positioning piece. And a clamping space for a workpiece to be filled with liquid is formed between the first clamping piece and the second clamping piece. The first positioning piece is connected to the first clamping piece and abuts against the workpiece, the first positioning piece is provided with a first through hole, and the first through hole communicates with the first liquid injection hole and a first inner flow channel of the workpiece. The first liquid injection hole of one clamping unit is communicated with the first liquid inlet of the first inner flow channel, and the first liquid injection hole of the other clamping unit is communicated with the first liquid outlet of the first inner flow channel. The liquid injection clamp can stably clamp a workpiece when liquid is injected into an inner runner of the workpiece, and is simple in structure and easy to operate.

Description

Technical Field

[0001] The invention relates to the technical field of positioning fixtures, and in particular to a liquid injection fixture and a flow monitoring device. Background Art

[0002] With the development of aerospace, automobile, navigation and other fields, the requirements for high-performance equipment such as aircraft engines, automobile engines, gas turbines, etc. are increasing. Therefore, more and more workpieces with more extreme working conditions and more complex structures containing inner cavities and inner flow channels have been developed. The production process of these workpieces is often more sophisticated and demanding, and at the same time, the added value of the workpieces is also higher.

[0003] However, in the prior art, due to the different shapes of the workpieces, the same clamp cannot be used to fix them, and the stability of the workpiece cannot be guaranteed when injecting liquid into the flow channel in the workpiece. Liquid leakage often occurs during injection, making it difficult to quantitatively detect the quality of the flow channel in the workpiece. As a result, there is a lack of effective means to determine the applicability of the workpiece during the development and use and maintenance of the workpiece.

[0004] Therefore, there is an urgent need for a liquid injection fixture and a flow detection device to solve the above problems. Summary of the invention

[0005] One object of the present invention is to provide a liquid injection fixture which can stably clamp a workpiece when injecting liquid into a flow channel in the workpiece, has a simple structure and is easy to operate.

[0006] To achieve this object, the present invention adopts the following technical solutions:

[0007] A liquid injection fixture is provided, comprising:

[0008] a first clamping member, wherein the first clamping member is provided with a first liquid injection hole;

[0009] A second clamping member, wherein the first clamping member and the second clamping member are spaced apart from each other, and a clamping space for a workpiece to be injected with liquid is formed between the first clamping member and the second clamping member;

[0010] a first positioning member, the first positioning member is connected to the first clamping member and abuts against the workpiece, the first positioning member is provided with a first through hole, one end of the first through hole is connected to the first inner flow channel of the workpiece, and the other end of the first through hole is connected to the first injection hole;

[0011] Wherein, the first clamping member, the second clamping member and the first positioning member constitute a clamping unit, and the injection fixture includes at least two clamping units, wherein the first injection hole of one of the clamping units is connected to the first liquid inlet of the first inner flow channel, and the first injection hole of the other clamping unit is connected to the first liquid outlet of the first inner flow channel.

[0012] As an optional solution of the liquid injection fixture, the first positioning member includes a first contact surface that contacts the workpiece, and the shape of the first contact surface is set to correspond to the shape of the side wall of the workpiece.

[0013] As an optional solution of the liquid injection fixture, the first through hole includes a first part and a second part, the first part and the second part are connected, the first part is connected to the first liquid injection hole, the second part is connected to the first internal flow channel, and the cross-sectional area of ​​the second part is smaller than the cross-sectional area of ​​the first part.

[0014] As an optional solution of the liquid injection fixture, a first limiting groove is formed on a side of the first clamping member facing the workpiece, and the first positioning member is limited in the first limiting groove.

[0015] As an optional solution of the liquid injection fixture, the first clamping member further comprises a first groove on a side facing the first positioning member, and a first protrusion is arranged on a side of the first positioning member facing the first clamping member, and the first protrusion is confined in the first groove.

[0016] As an optional solution of the liquid injection clamp, the liquid injection clamp further includes a first penetration member, and the first penetration member can be penetrated through the first liquid injection hole and the first through hole and extend into the first inner flow channel.

[0017] As an optional solution of the liquid injection fixture, the second clamping member is provided with a second liquid injection hole, and the second liquid injection hole is connected to the second inner flow channel of the workpiece.

[0018] As an optional solution of the liquid injection fixture, the liquid injection fixture also includes a second positioning member, which is connected to the second clamping member and abuts against the workpiece. The second positioning member is provided with a second through hole, and the second through hole is connected between the second liquid injection hole and the second inner flow channel.

[0019] As an optional solution of the liquid injection fixture, the liquid injection fixture further includes a second penetrating member, and the second penetrating member can penetrate the second through hole and the second liquid injection hole and extend into the second inner flow channel.

[0020] Another object of the present invention is to provide a flow detection device that can ensure the stability of the workpiece when injecting liquid into the inner flow channel of the workpiece and improve the accuracy of flow detection.

[0021] To achieve this object, the present invention adopts the following technical solutions:

[0022] A flow detection device is provided, comprising a liquid injection mechanism, a detection element and the above-mentioned liquid injection fixture, wherein the liquid injection mechanism injects liquid into the first liquid inlet of the first inner flow channel, and the detection element is arranged at the first liquid outlet of the first inner flow channel.

[0023] Beneficial effects of the present invention:

[0024] The present invention provides a liquid injection clamp, comprising at least two clamping units, so as to ensure the stability of clamping. Specifically, the clamping unit comprises a first clamping piece, a second clamping piece and a first positioning piece. The first clamping piece and the second clamping piece are spaced apart from each other to form a clamping space for the workpiece to be injected with liquid, and can clamp the workpiece to be injected with liquid to ensure the stability of the workpiece during the injection process; the first positioning piece is located between the first clamping piece and the workpiece, and can position the workpiece on the first positioning piece to prevent relative movement between the workpiece and the first clamping piece, thereby further ensuring the stability of the workpiece; the first clamping piece also includes a first injection hole, and the first positioning piece is provided with a first through hole, and the first through hole can connect the first injection hole and the first inner flow channel of the workpiece. Liquid can be injected into the first inner flow channel of the workpiece by injecting liquid into the first injection hole, thereby the injection device can be fixed on the clamping unit, which is convenient for aligning the injection device with the first inner flow channel of the workpiece after replacing the workpiece, and at the same time, it can prevent the first clamping piece from blocking the inlet and outlet of the first inner flow channel after clamping the workpiece, thereby expanding the clamping range of the clamping unit.

[0025] The present invention also provides a flow detection device, including a liquid injection mechanism, a detection element and the above-mentioned liquid injection fixture, the liquid injection fixture can ensure the stability of the workpiece, the liquid injection mechanism injects liquid into the liquid inlet of the inner flow channel, and the detection element is located at the liquid outlet of the inner flow channel to perform flow detection, thereby improving the accuracy of flow detection in the inner flow channel of the workpiece. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 It is a front view of the first clamping member of the liquid injection clamp provided by the present invention;

[0027] Figure 2 is a top view of the first clamping member of the liquid injection clamp provided by the present invention;

[0028] Figure 3 This is a front view of the first positioning member of the liquid injection fixture provided by the present invention;

[0029] Figure 4 is a cross-sectional view of a first positioning member of the liquid injection fixture provided by the present invention;

[0030] Figure 5 It is a front view of the second clamping member of the liquid injection clamp provided by the present invention;

[0031] Figure 6 It is a cross-sectional view of the second positioning member of the liquid injection fixture provided by the present invention.

[0032] In the figure:

[0033] 1. first clamping member; 11. first injection hole; 12. first limiting groove; 13. first groove; 14. first threaded hole; 15. first connecting hole;

[0034] 2. second clamping member; 21. second injection hole; 22. second limiting groove; 23. second groove; 24. third threaded hole; 25. second connecting hole;

[0035] 3. first positioning member; 31. first through hole; 311. first portion; 312. second portion; 32. first contact surface; 33. first protrusion; 34. second threaded hole;

[0036] 4. Second positioning member; 41. Second through hole; 411. Third portion; 412. Fourth portion; 42. Second contact surface; 43. Second protrusion; 44. Fourth threaded hole. DETAILED DESCRIPTION

[0037] The present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It is to be understood that the specific embodiments described herein are only used to explain the present invention, rather than to limit the present invention. It should also be noted that, for ease of description, only parts related to the present invention, rather than all structures, are shown in the accompanying drawings.

[0038] In the description of the present invention, unless otherwise clearly specified and limited, the terms "connected", "connected", and "fixed" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0039] In the present invention, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may include that the first and second features are in direct contact, or may include that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, a first feature being "above", "above" and "above" a second feature includes that the first feature is directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. A first feature being "below", "below" and "below" a second feature includes that the first feature is directly below and obliquely below the second feature, or simply indicates that the first feature is lower in level than the second feature.

[0040] In the description of this embodiment, the terms "upper", "lower", "right", etc., directions or positional relationships are based on the directions or positional relationships shown in the drawings, and are only for the convenience of description and simplification of operation, rather than indicating or implying that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as limiting the present invention. In addition, the terms "first" and "second" are only used to distinguish in the description and have no special meaning.

[0041] like Figures 1 to 6 As shown, the liquid injection fixture of this embodiment includes a first clamping member 1, a second clamping member 2 and a first positioning member 3, and the first clamping member 1 is provided with a first liquid injection hole 11. The first clamping member 1 and the second clamping member 2 are arranged at intervals, and a clamping space for the workpiece to be injected is formed between the first clamping member 1 and the second clamping member 2. The first positioning member 3 is connected to the first clamping member 1 and abuts against the workpiece, and the first positioning member 3 is provided with a first through hole 31, one end of the first through hole 31 is connected to the first inner flow channel of the workpiece, and the other end of the first through hole 31 is connected to the first liquid injection hole 11. Among them, the first clamping member 1, the second clamping member 2 and the first positioning member 3 constitute a clamping unit, and the liquid injection fixture includes at least two clamping units, wherein the first liquid injection hole 11 of one clamping unit is connected to the first liquid inlet of the first inner flow channel, and the first liquid injection hole 11 of the other clamping unit is connected to the first liquid outlet of the first inner flow channel.

[0042] The present invention provides a liquid injection fixture, comprising at least two clamping units, so as to ensure the stability of clamping. Specifically, the clamping unit comprises a first clamping member 1, a second clamping member 2 and a first positioning member 3. The first clamping member 1 and the second clamping member 2 are arranged at an interval from each other, and can clamp the workpiece to be injected with liquid, so as to ensure the stability of the workpiece during the liquid injection process; the first positioning member 3 is located between the first clamping member 1 and the workpiece, and can position the workpiece on the first positioning member 3 to prevent relative movement between the workpiece and the first clamping member 1, so as to further ensure the stability of the workpiece. The first clamping member 1 also includes a first injection hole 11, and the first positioning member 3 is provided with a first through hole 31. The first through hole 31 can connect the first injection hole 11 and the first inner flow channel of the workpiece. The first inner flow channel of the workpiece can be injected by injecting liquid into the first injection hole 11. Thus, the injection device can be fixed on the clamping unit, which is convenient for aligning the injection device with the first inner flow channel of the workpiece after replacing the workpiece. At the same time, it can prevent the first clamping member 1 from blocking the inlet and outlet of the first inner flow channel after clamping the workpiece, thereby expanding the clamping range of the clamping unit. The injection fixture has a simple structure and is easy to operate. It can be used for injection in multiple links such as workpiece development, manufacturing, and maintenance, and has strong applicability.

[0043] Furthermore, the liquid injection fixture also includes a first penetration piece, which can be penetrated through the first liquid injection hole 11 and the first through hole 31 and extend into the first inner flow channel, and is used to detect whether the first liquid injection hole 11, the first through hole 31 and the first inner flow channel are unobstructed, so as to ensure that liquid can be smoothly injected into the first inner flow channel. Exemplarily, the first penetration piece can be a round rod, a square rod, etc., and the first penetration piece can be made of metal materials, such as stainless steel, aluminum alloy, etc., or non-metallic materials such as silicon oxide, plastic, etc., and the shape of one end of the first penetration piece extending into the first inner flow channel can be adjusted according to the shape of the first inner flow channel.

[0044] Further, the first through hole 31 includes a first portion 311 and a second portion 312, the first portion 311 and the second portion 312 are connected, the first portion 311 is connected to the first injection hole 11, the second portion 312 is connected to the first inner flow channel, and the cross-sectional area of ​​the second portion 312 is smaller than the cross-sectional area of ​​the first portion 311, so that the first through hole 31 is funnel-shaped, the cross-sectional shape of the first portion 311 is consistent with the shape of the first injection hole 11, and the cross-sectional shape of the second portion 312 is consistent, which is convenient for injecting liquid into the first inner flow channel. In some embodiments, the cross-sectional shape of the first portion 311 is circular, and the cross-sectional shape of the second portion 312 is square. In some other embodiments, the first through hole 31 may also be funnel-shaped, and the cross-sectional area of ​​the first portion 311 gradually decreases from one end connected to the first injection hole 11 to one end connected to the second portion 312.

[0045] Optionally, the first positioning member 3 includes a first contact surface 32 in contact with the workpiece, and the shape of the first contact surface 32 is set corresponding to the shape of the side wall of the workpiece, which facilitates the positioning of the workpiece and the first positioning member 3, and can increase the contact area between the first positioning member 3 and the workpiece, reduce the pressure on the workpiece when clamping the workpiece, and avoid damage to the surface of the workpiece. In this embodiment, the clamped position of the workpiece is an arc surface radially outward from the workpiece, and the first contact surface 32 is set to be a corresponding arc surface.

[0046] Optionally, the liquid injection fixture further includes a first sealing ring (not shown in the figure), which is connected to a side of the first positioning member 3 facing the workpiece, and is used to ensure the sealing between the first through hole 31 and the first inner flow channel.

[0047] Furthermore, a first limiting groove 12 is formed on one side of the first clamping member 1 facing the workpiece, and the first positioning member 3 is limited in the first limiting groove 12, so that the first positioning member 3 and the first clamping member 1 can be limited in the first direction. Figure 1 In the X direction, the stability between the first positioning member 3 and the first clamping member 1 is improved.

[0048] Furthermore, the first clamping member 1 further comprises a first groove 13 on one side facing the first positioning member 3, and a first protrusion 33 is arranged on the side facing the first clamping member 1. The first protrusion 33 is limited in the first groove 13, so as to realize the positioning between the first positioning member 3 and the first clamping member 1 in the second direction, wherein the second direction is Figure 1 The Y direction of the first positioning member 3 and the first clamping member 1 is further improved. In this embodiment, two first grooves 13 and two first protrusions 33 are provided, and the first grooves 13 are provided on the bottom surface of the first limiting groove 12.

[0049] Optionally, the first clamping member 1 is further provided with a first threaded hole 14 on the side facing the first positioning member 3, and the first positioning member 3 is provided with a second threaded hole 34. A first bolt (not shown in the figure) can connect the first threaded hole 14 and the second threaded hole 34 to achieve the connection and fixation of the first positioning member 3 and the first clamping member 1. In this embodiment, the first threaded hole 14 is provided on the bottom surface of the first limiting groove 12, and two first threaded holes 14 and two second threaded holes 34 are provided. The two first threaded holes 14 are located on both sides of the first injection hole 11, so that the connection between the first positioning member 3 and the first clamping member 1 is more stable.

[0050] The injection fixture also includes a connecting member (not shown in the figure), which connects the first clamping member 1 and the second clamping member 2, so that the first clamping member 1 and the second clamping member 2 can move closer to and farther from each other, thereby clamping and preventing the workpiece from loosening. Optionally, a first connecting hole 15 is provided on the first clamping member 1, and a second connecting hole 25 is provided on the second clamping member 2. The connecting member is a second bolt and a nut. The second bolt is inserted through the first connecting hole 15 and the second connecting hole 25 and is threadedly connected to the nut. The first clamping member 1 and the second clamping member 2 can move closer to and farther from each other by rotating the nut. In this embodiment, two connecting members are provided, and the two connecting members are respectively connected to the two ends of the first clamping member 1 and the second clamping member 2 to prevent the first clamping member 1 and the second clamping member 2 from offsetting and ensure the stability of the clamped workpiece.

[0051] It should be noted that, since a plurality of internal flow channels are often provided in a workpiece, a second injection hole 21 may be provided on the second clamp 2, and the second injection hole 21 is connected to the second internal flow channel of the workpiece, thereby achieving simultaneous injection of a plurality of internal flow channels and improving the efficiency of injection.

[0052] Furthermore, the injection fixture further includes a second positioning member 4, which is connected to the second clamping member 2 and abuts against the workpiece, and is provided with a second through hole 41, which is connected between the second injection hole 21 and the second inner flow channel. The second positioning member 4 prevents the workpiece from relative movement with the second clamping member 2, and can position the workpiece between the first positioning member 3 and the second positioning member 4, further ensuring the stability of the workpiece.

[0053] Furthermore, the injection fixture also includes a second piercing piece, which can penetrate the second through hole 41 and the second injection hole 21 and extend into the second inner flow channel, and is used to detect whether the first injection hole 11, the first through hole 31 and the first inner flow channel are unobstructed, ensuring that liquid can be smoothly injected into the first inner flow channel.

[0054] To reduce manufacturing costs, in this embodiment, the second clamping member 2 and the first clamping member 1 have the same structure and are symmetrically arranged, the second positioning member 4 and the first positioning member 3 have the same structure and are symmetrically arranged, and the second penetrating member and the first penetrating member have the same structure.

[0055] Specifically, the second through hole 41 includes a third portion 411 and a fourth portion 412, the third portion 411 and the fourth portion 412 are connected, the third portion 411 is connected to the second injection hole 21, the fourth portion 412 is connected to the second inner flow channel, and the cross-sectional area of ​​the fourth portion 412 is smaller than the cross-sectional area of ​​the third portion 411, so that the second through hole 41 is funnel-shaped, the cross-sectional shape of the third portion 411 is consistent with the shape of the second injection hole 21, and the cross-sectional shape of the fourth portion 412 is consistent, which is convenient for injecting liquid into the second inner flow channel. In some embodiments, the cross-sectional shape of the third portion 411 is circular, and the cross-sectional shape of the fourth portion 412 is square. In some other embodiments, the second through hole 41 may also be funnel-shaped, and the cross-sectional area of ​​the third portion 411 gradually decreases from one end connected to the second injection hole 21 to one end connected to the fourth portion 412.

[0056] Optionally, the second positioning member 4 includes a second contact surface 42 in contact with the workpiece, and the shape of the second contact surface 42 is set corresponding to the shape of the side wall of the workpiece, which facilitates the positioning of the workpiece and the second positioning member 4, and can increase the contact area between the second positioning member 4 and the workpiece, reduce the pressure on the workpiece when clamping the workpiece, and avoid damage to the surface of the workpiece. In this embodiment, the clamped position of the workpiece is an arc surface radially outward from the workpiece, and the second contact surface 42 is set to be a corresponding arc surface.

[0057] Optionally, the liquid injection fixture further includes a second sealing ring (not shown in the figure), which is connected to a side of the second positioning member 4 facing the workpiece, and is used to ensure the sealing between the second through hole 41 and the second inner flow channel.

[0058] Furthermore, a second limiting groove 22 is formed on a side of the second clamping member 2 facing the workpiece, and the second positioning member 4 is limited in the second limiting groove 22, which can achieve limitation between the second positioning member 4 and the second clamping member 2 in the first direction, thereby improving the stability between the second positioning member 4 and the second clamping member 2.

[0059] Furthermore, the second clamping member 2 further includes a second groove 23 on one side facing the second positioning member 4, and a second protrusion 43 is provided on one side facing the second clamping member 2. The second protrusion 43 is limited in the second groove 23, so that the second positioning member 4 and the second clamping member 2 can be positioned in the second direction, and the stability between the second positioning member 4 and the second clamping member 2 is further improved. In this embodiment, two second grooves 23 and two second protrusions 43 are provided, and the second groove 23 is provided on the bottom surface of the second limiting groove 22.

[0060] Optionally, a third threaded hole 24 is further provided on the side of the second clamping member 2 facing the second positioning member 4, and a fourth threaded hole 44 is provided on the second positioning member 4. A third bolt (not shown in the figure) can connect the third threaded hole 24 and the fourth threaded hole 44 to achieve the connection and fixation of the second positioning member 4 and the second clamping member 2. In this embodiment, the third threaded hole 24 is provided on the bottom surface of the second limiting groove 22, and two third threaded holes 24 and four fourth threaded holes 44 are provided. The two third threaded holes 24 are located on both sides of the second injection hole 21, so that the connection between the second positioning member 4 and the second clamping member 2 is more stable.

[0061] This embodiment also provides a flow detection device, including a liquid injection mechanism, a detection element and the above-mentioned liquid injection fixture, both of which are connected to a connecting pipe outside the two first liquid injection holes 11, and the liquid injection mechanism injects a certain pressure of liquid into the first liquid inlet of the first inner flow channel through the connecting pipe, and the liquid flows into the first liquid inlet of the first inner flow channel through a first liquid injection hole 11 and a first through hole 31 in sequence, and flows out from the first liquid outlet, another first through hole 31 and another first liquid injection hole 11, and the detection element is arranged on the connecting pipe outside the first liquid outlet of the first inner flow channel to detect the flow of the first inner flow channel. The liquid injection fixture can ensure the stability of the workpiece, the liquid injection mechanism injects liquid into the liquid inlet of the inner flow channel of the workpiece, and the detection element is located at the liquid outlet of the inner flow channel to detect the flow, thereby improving the accuracy of the flow detection of the inner flow channel of the workpiece.

[0062] Obviously, the above embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the embodiments of the present invention. For those skilled in the art, other different forms of changes or modifications can be made based on the above description. It is not necessary and impossible to list all the embodiments here. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the claims of the present invention.

Claims

1. A liquid injection fixture, characterized in that: include: A first clamping member (1), wherein the first clamping member (1) is provided with a first liquid injection hole (11); A second clamping member (2), wherein the first clamping member (1) and the second clamping member (2) are arranged at an interval, and a clamping space for a workpiece to be injected with liquid is formed between the first clamping member (1) and the second clamping member (2); a first positioning member (3), the first positioning member (3) being connected to the first clamping member (1) and abutting against the workpiece, the first positioning member (3) being provided with a first through hole (31), one end of the first through hole (31) being connected to a first inner flow channel of the workpiece, and the other end of the first through hole (31) being connected to the first liquid injection hole (11); Wherein, the first clamping member (1), the second clamping member (2) and the first positioning member (3) constitute a clamping unit, and the injection fixture includes at least two clamping units, wherein the first injection hole (11) of one of the clamping units is connected to the first liquid inlet of the first inner flow channel, and the first injection hole (11) of the other clamping unit is connected to the first liquid outlet of the first inner flow channel.

2. The liquid injection fixture according to claim 1, characterized in that: The first positioning member (3) comprises a first contact surface (32) in contact with the workpiece, and the shape of the first contact surface (32) is arranged corresponding to the shape of the side wall of the workpiece.

3. The liquid injection fixture according to claim 1, characterized in that: The first through hole (31) comprises a first portion (311) and a second portion (312); the first portion (311) and the second portion (312) are connected; the first portion (311) is connected to the first liquid injection hole (11); the second portion (312) is connected to the first internal flow channel; and the cross-sectional area of ​​the second portion (312) is smaller than the cross-sectional area of ​​the first portion (311).

4. The liquid injection fixture according to claim 1, characterized in that: A first limiting groove (12) is formed on a side of the first clamping member (1) facing the workpiece, and the first positioning member (3) is limited in the first limiting groove (12).

5. The liquid injection fixture according to claim 1, characterized in that: The first clamping member (1) further comprises a first groove (13) on one side facing the first positioning member (3), and a first protrusion (33) is arranged on the side facing the first clamping member (1), and the first protrusion (33) is confined in the first groove (13).

6. The liquid injection fixture according to claim 1, characterized in that: The liquid injection fixture further comprises a first penetration member, which can be penetrated through the first liquid injection hole (11) and the first through hole (31) and extend into the first inner flow channel.

7. The liquid injection fixture according to any one of claims 1 to 6, characterized in that: The second clamping member (2) is provided with a second liquid injection hole (21), and the second liquid injection hole (21) is connected to the second inner flow channel of the workpiece.

8. The liquid injection fixture according to claim 7, characterized in that: The liquid injection fixture further comprises a second positioning member (4), the second positioning member (4) being connected to the second clamping member (2) and abutting against the workpiece, the second positioning member (4) being provided with a second through hole (41), the second through hole (41) being connected between the second liquid injection hole (21) and the second inner flow channel.

9. The liquid injection fixture according to claim 8, characterized in that: The liquid injection fixture further comprises a second penetration member, which is capable of penetrating the second through hole (41) and the second liquid injection hole (21) and extending into the second inner flow channel.

10. A flow detection device, characterized in that: It comprises a liquid injection mechanism, a detection element and the liquid injection fixture according to any one of claims 1 to 9, wherein the liquid injection mechanism injects liquid into the first liquid inlet of the first inner flow channel, and the detection element is arranged at the first liquid outlet of the first inner flow channel.

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