Liquid injection clamp and flow detection device

Abstract

The utility model 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 utility model relates to positioning fixture technical field especially, relates to a kind of liquid injection fixture and flow monitoring device. BACKGROUND

[0002] With the development of aerospace, automobile, navigation and other fields, the requirements of high-performance equipment such as aircraft engines, automobile engines and gas turbines are increasing. Therefore, more and more workpieces with internal cavities and internal flow channels that can withstand extreme working conditions and have complex structures have been developed. The production process of these workpieces is often more delicate and requires higher standards, while 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 fixture cannot be used for fixation, and the stability of the workpiece cannot be guaranteed when injecting liquid into the internal flow channel of the workpiece. When injecting liquid, it often leads to leakage of liquid, making it difficult to quantitatively detect the quality of the internal flow channel of the workpiece, and further lacking effective means to determine the applicability of the workpiece during the development and use of the workpiece.

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

[0005] One object of the present utility model is to provide a liquid injection fixture that can stably clamp the workpiece when injecting liquid into the internal flow channel of the workpiece, with a simple structure and easy operation.

[0006] To achieve this purpose, the utility model adopts the following technical solutions:

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

[0008] A first clamping member is provided with a first liquid injection hole;

[0009] A second clamping member is arranged between the first clamping member and the second clamping member, and a clamping space for the workpiece to be injected is formed between the first clamping member and the second clamping member;

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

[0011] The first clamping member, the second clamping member and the first positioning member constitute a clamping unit, the liquid injection fixture comprises at least two clamping units, the first liquid injection hole of one of the clamping units is communicated with the first liquid inlet of the first internal flow channel, and the first liquid injection hole of the other clamping unit is communicated with the first liquid outlet of the first internal flow channel.

[0012] As an alternative solution of the liquid injection jig, the first positioning member comprises a first contact surface in contact with the workpiece, and the shape of the first contact surface is arranged in correspondence with the shape of the sidewall of the workpiece.

[0013] As an alternative solution of the liquid injection jig, the first through hole comprises a first part and a second part, the first part and the second part are in communication, the first part is communicated with the first liquid injection hole, and the second part is communicated with the first inner flow channel, and the cross-sectional area of the second part is smaller than that of the first part.

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

[0015] As an alternative solution of the liquid injection jig, the first clamping member further comprises a first recess on the side facing the first positioning member, and the first positioning member is provided with a first protrusion on the side facing the first clamping member, and the first protrusion is limited in the first recess.

[0016] As an alternative solution of the liquid injection jig, the liquid injection jig further comprises a first penetrating member, and the first penetrating member can penetrate the first liquid injection hole and the first through hole and extend into the first inner flow channel.

[0017] As an alternative solution of the liquid injection jig, the second clamping member is provided with a second liquid injection hole, and the second liquid injection hole is communicated with the second inner flow channel of the workpiece.

[0018] As an alternative solution of the liquid injection jig, the liquid injection jig further comprises a second positioning member, the second positioning member 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 communicated between the second liquid injection hole and the second inner flow channel.

[0019] As an alternative solution of the liquid injection jig, the liquid injection jig further comprises 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 purpose of the utility model is to provide a flow detection device which can ensure the stability of the workpiece and improve the precision of flow detection when injecting liquid into the inner flow channel of the workpiece.

[0021] To achieve this purpose, the utility model adopts the following technical scheme:

[0022] A flow detection device is provided, comprising a liquid injection mechanism, a detection element and the above-mentioned liquid injection clamp, the liquid injection mechanism injects liquid to 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] The utility model discloses beneficial effects:

[0024] The utility model provides a liquid injection clamp, including at least two clamping units to guarantee the stability of clamping, specifically, the clamping unit includes first clamping piece, second clamping piece and first positioning piece, and the first clamping piece and the second clamping piece are mutually spaced and form the clamping space of the workpiece to be injected liquid, can clamp the workpiece to be injected liquid, guarantee the stability of workpiece in the liquid injection process, the first positioning piece is located between the first clamping piece and the workpiece, can position the workpiece on the first positioning piece, prevent the relative movement between the workpiece and the first clamping piece, further guarantee the stability of workpiece, and the first clamping piece still includes first liquid injection hole, and the first positioning piece is provided with first through -hole, and the first through -hole can communicate the first liquid injection hole and the first inner flow channel of the workpiece, and by injecting liquid to the first liquid injection hole, the first inner flow channel of the workpiece can be injected liquid, thereby can fix the liquid injection device on the clamping unit, and the alignment of the liquid injection device and the first inner flow channel of the workpiece is convenient after replacing the workpiece, and the inlet and outlet of the first inner flow channel can be prevented from being shielded after the first clamping piece clamps the workpiece, and the clamping range of the clamping unit is expanded.

[0025] The utility model also provides a kind of flow detection device, including liquid injection mechanism, detection element and the above-mentioned liquid injection clamp, liquid injection clamp can guarantee the stability of workpiece, liquid injection mechanism injects liquid to the liquid inlet of inner flow channel, and detection element is located at the liquid outlet of inner flow channel and carries out flow detection, improves the precision of workpiece inner flow channel flow detection. BRIEF DESCRIPTION OF DRAWINGS

[0026] Figure 1 It is the front view of the first clamping piece of the liquid injection clamp provided by the utility model;

[0027] Figure 2 It is the top view of the first clamping piece of the liquid injection clamp provided by the utility model;

[0028] Figure 3 It is the front view of the first positioning piece of the liquid injection clamp provided by the utility model;

[0029] Figure 4 It is the sectional view of the first positioning piece of the liquid injection clamp provided by the utility model;

[0030] Figure 5 It is the front view of the second clamping piece of the liquid injection clamp provided by the utility model;

[0031] Figure 6is a sectional view of the second positioning member of the liquid injection clamp.

[0032] In the drawings:

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

[0034] 2, second clamping member; 21, second liquid 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 part; 312, second part; 32, first contact surface; 33, first protrusion; 34, second threaded hole;

[0036] 4, second positioning member; 41, second through hole; 411, third part; 412, fourth part; 42, second contact surface; 43, second protrusion; 44, fourth threaded hole. DETAILED DESCRIPTION

[0037] The utility model will be made further detailed description in combination with the drawings and examples. It can be understood that the specific examples described here are only used to explain the utility model, and not limited to the utility model. In addition, it needs to be explained that in order to facilitate the description, only the part related to the utility model is shown in the drawings, not all structures.

[0038] In the description of the utility model, unless there is explicit definition and limitation, the terms "connected", "connected", "fixed" should be broad sense, for example, it can be fixed connection, or detachable connection, or integral; It can be mechanical connection, or electrical connection; It can be directly connected, or indirectly connected through intermediate medium, or the communication inside two elements or the interaction relationship of two elements. For ordinary skilled in the art, the specific meaning of the above terms in the utility model can be understood according to the specific circumstances.

[0039] In the utility model, unless there is explicit definition and limitation, the first feature is "on" or "below" the second feature, which can include the direct contact of the first and second features, or the contact of the first and second features through another feature between them. Moreover, the first feature "on", "above" and "above" the second feature includes that the first feature is directly above and obliquely above the second feature, or only indicates that the horizontal height of the first feature is higher than that of the second feature. The first feature "below", "below" and "below" the second feature includes that the first feature is directly below and obliquely below the second feature, or only indicates that the horizontal height of the first feature is less than that of the second feature.

[0040] In the description of the present embodiment, the terms "upper", "lower", "right", "left", etc. are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of description and simplification of operation, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the present utility model. In addition, the terms "first" and "second" are only used to distinguish in the description and have no special meaning.

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

[0042] The present utility model provides a kind of liquid injection fixture, including at least two clamping units, to guarantee the stability of clamping, specifically, clamping unit includes first clamping piece 1, second clamping piece 2 and first positioning piece 3, first clamping piece 1 and second clamping piece 2 are mutually arranged at intervals, can clamp the workpiece to be injected, guarantee the stability of workpiece in the process of injection;First positioning piece 3 is located between first clamping piece 1 and workpiece, can position workpiece on first positioning piece 3, prevent relative movement between workpiece and first clamping piece 1, further guarantee the stability of workpiece;First clamping piece 1 further includes first liquid injection hole 11, first positioning piece 3 is provided with first through hole 31, first through hole 31 can be communicated first liquid injection hole 11 and the first inner flow channel of workpiece, by injection to first liquid injection hole 11, it can be realized to the first inner flow channel of workpiece injection, whereby it can be fixed on clamping unit to liquid injection device, it is convenient to replace workpiece after liquid injection device and the alignment of workpiece first inner flow channel, while it can prevent first clamping piece 1 from blocking import and export of first inner flow channel after clamping workpiece, expand the clamping range of clamping unit. The liquid injection fixture is simple in structure, easy to operate, can be injected in workpiece development, manufacturing, maintenance and other links, and has strong applicability.

[0043] Further, the liquid injection jig further comprises a first penetrating member, the first penetrating member is capable of penetrating the first liquid injection hole 11 and the first through hole 31 and extending into the first inner flow channel, and is used for detecting 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 the liquid can be smoothly injected into the first inner flow channel. For example, the first penetrating member can be a circular rod, a square rod or the like. The first penetrating member can be made of a metal material such as stainless steel or aluminum alloy, or can be made of a non-metal material such as silicon oxide or plastic. The shape of the end of the first penetrating member 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 comprises a first part 311 and a second part 312, the first part 311 and the second part 312 are in communication, the first part 311 is in communication with the first liquid injection hole 11, and the second part 312 is in communication with the first inner flow channel. The cross-sectional area of the second part 312 is smaller than that of the first part 311, so that the first through hole 31 is funnel-shaped. The cross-sectional shape of the first part 311 is consistent with the shape of the first liquid injection hole 11, and the cross-sectional shape of the second part 312 is consistent, which facilitates the injection of liquid into the first inner flow channel. In some embodiments, the cross section of the first part 311 is circular, and the cross section of the second part 312 is square. In some other embodiments, the first through hole 31 can also be funnel-shaped, and the cross-sectional area of the first part 311 gradually decreases from the end in communication with the first liquid injection hole 11 to the end in communication with the second part 312.

[0045] Optionally, the first positioning member 3 comprises a first contact surface 32 in contact with the workpiece. The shape of the first contact surface 32 corresponds 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 effect on the workpiece when the workpiece is clamped, and avoid damage to the surface of the workpiece. In this embodiment, the clamped position of the workpiece is a circular arc surface along the radial direction of the workpiece, and the first contact surface 32 is correspondingly arc-shaped.

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

[0047] Further, the side of the first clamping member 1 facing the workpiece forms a first limiting groove 12, and the first positioning member 3 is limited in the first limiting groove 12, so as to realize the limiting between the first positioning member 3 and the first clamping member 1 in the first direction, which is the X direction in the figure, thereby improving the stability between the first positioning member 3 and the first clamping member 1. Figure 1

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

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

[0050] The liquid injection clamp further comprises a connecting piece (not shown in the figure), which connects the first clamping piece 1 and the second clamping piece 2, so as to realize that the first clamping piece 1 and the second clamping piece 2 can approach and move away from each other, and realize the clamping and anti-loosening of the workpiece. Optionally, the first clamping piece 1 is provided with a first connecting hole 15, and the second clamping piece 2 is provided with a second connecting hole 25, and the connecting piece is a second bolt and a nut, the second bolt is arranged in the first connecting hole 15 and the second connecting hole 25 and is threadedly connected with the nut, and the approaching and moving away of the first clamping piece 1 and the second clamping piece 2 from each other is realized by rotating the nut. In the embodiment, two connecting pieces are arranged, and the two connecting pieces are respectively connected to the two ends of the first clamping piece 1 and the second clamping piece 2, so as to prevent the first clamping piece 1 and the second clamping piece 2 from deviating, and ensure the stability of clamping the workpiece.

[0051] It should be noted that since multiple inner flow channels are often arranged in the workpiece, a second liquid injection hole 21 can be arranged on the second clamping piece 2, and the second liquid injection hole 21 is communicated with the second inner flow channel of the workpiece, so as to realize the simultaneous liquid injection of multiple inner flow channels and improve the efficiency of liquid injection.

[0052] Further, the liquid injection fixture further comprises a second positioning member 4 connected to the second clamping member 2 and abutting against the workpiece, the second positioning member 4 is provided with a second through hole 41 communicating between the second liquid injection hole 21 and the second inner flow channel. By the second positioning member 4, the relative movement between the workpiece and the second clamping member 2 is prevented, and the workpiece can be positioned between the first positioning member 3 and the second positioning member 4, further ensuring the stability of the workpiece.

[0053] Further, the liquid injection fixture further comprises a second positioning member 4 connected to the second clamping member 2 and abutting against the workpiece, the second positioning member 4 is provided with a second through hole 41 communicating between the second liquid injection hole 21 and the second inner flow channel. By the second positioning member 4, the relative movement between the workpiece and the second clamping member 2 is prevented, and the workpiece can be positioned between the first positioning member 3 and the second positioning member 4, further ensuring the stability of the workpiece.

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

[0055] Specifically, the second through hole 41 comprises a third part 411 and a fourth part 412, the third part 411 and the fourth part 412 are in communication, the third part 411 communicates with the second liquid injection hole 21, and the fourth part 412 communicates with the second inner flow channel, the cross-sectional area of the fourth part 412 is smaller than that of the third part 411, so that the second through hole 41 is funnel-shaped, the cross-sectional shape of the third part 411 is consistent with the shape of the second liquid injection hole 21, and the cross-sectional shape of the fourth part 412 is consistent, facilitating the injection of liquid into the second inner flow channel. In some embodiments, the cross section of the third part 411 is circular, and the cross-sectional shape of the fourth part 412 is square. In some other embodiments, the second through hole 41 can also be funnel-shaped, and the cross-sectional area of the third part 411 gradually decreases from one end communicating with the second liquid injection hole 21 to the other end communicating with the fourth part 412.

[0056] Optionally, the second positioning member 4 comprises a second contact surface 42 in contact with the workpiece, the shape of the second contact surface 42 corresponds to the shape of the sidewall of the workpiece, facilitating the positioning of the workpiece and the second positioning member 4, and being capable of increasing the contact area between the second positioning member 4 and the workpiece, reducing the pressure effect on the workpiece when clamping the workpiece, and avoiding damage to the surface of the workpiece. In the embodiment, the clamped position of the workpiece is a circular arc surface outward along the radial direction of the workpiece, and the second contact surface 42 is correspondingly provided as an arc surface.

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

[0058] Further, the second clamping piece 2 is provided with a second limiting groove 22 on the side facing the workpiece, and the second positioning piece 4 is limited in the second limiting groove 22, so that the positioning between the second positioning piece 4 and the second clamping piece 2 in the first direction is realized, and the stability between the second positioning piece 4 and the second clamping piece 2 is improved.

[0059] Further, the second clamping piece 2 is provided with a second recess 23 on the side facing the second positioning piece 4, and the second positioning piece 4 is provided with a second protrusion 43 on the side facing the second clamping piece 2, and the second protrusion 43 is limited in the second recess 23, so that the positioning between the second positioning piece 4 and the second clamping piece 2 in the second direction is realized, and the stability between the second positioning piece 4 and the second clamping piece 2 is further improved. In the embodiment, two second recesses 23 and two second protrusions 43 are provided, and the second recesses 23 are arranged on the bottom surface of the second limiting groove 22.

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

[0061] The embodiment also provides a flow detection device, which comprises a liquid injection mechanism, a detection element and the above-mentioned liquid injection clamp, and a connecting pipe is connected to both of the first liquid injection holes 11, the liquid injection mechanism injects liquid with a certain pressure into the first liquid inlet of the first inner flow channel through the connecting pipe, the liquid flows into the first liquid inlet of the first inner flow channel from one first liquid injection hole 11 and one first through hole 31 in turn, 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, so that the flow detection of the first inner flow channel is realized. The liquid injection clamp 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, so that the accuracy of the flow detection of the inner flow channel of the workpiece is improved.

[0062] Obviously, the above embodiments of the present application are merely examples for clearly illustrating the present application, and are not intended to limit the implementation modes of the present application. For those skilled in the art, other different forms of changes or variations can be made on the basis of the above description. Here, it is not necessary and also impossible to exhaust all the implementation modes. Any modification, equivalent replacement and improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application claims.

Claims

1. A liquid injection clamp, characterized in that, include: The first clamping member (1) is provided with a first injection hole (11); The second clamping member (2) is provided with the first clamping member (1) and the second clamping member (2) spaced apart, 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. 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 injection hole (11). The first clamping member (1), the second clamping member (2), and the first positioning member (3) constitute a clamping unit. The liquid injection clamp includes at least two clamping units. 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.

2. The liquid injection clamp according to claim 1, characterized in that, The first positioning element (3) includes a first contact surface (32) that contacts the workpiece, and the shape of the first contact surface (32) corresponds to the shape of the side wall of the workpiece.

3. The liquid injection clamp according to claim 1, characterized in that, The first through hole (31) includes a first part (311) and a second part (312). The first part (311) and the second part (312) are connected. The first part (311) is connected to the first injection hole (11), and the second part (312) is connected to the first inner flow channel. The cross-sectional area of ​​the second part (312) is smaller than the cross-sectional area of ​​the first part (311).

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

5. The liquid injection clamp according to claim 1, characterized in that, The side of the first clamping member (1) facing the first positioning member (3) also includes a first groove (13), and the side of the first positioning member (3) facing the first clamping member (1) is provided with a first protrusion (33), and the first protrusion (33) is located in the first groove (13).

6. The liquid injection clamp according to claim 1, characterized in that, The liquid injection clamp also includes a first through member, which can pass 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 clamp according to any one of claims 1-6, characterized in that, The second clamping member (2) is provided with a second injection hole (21), which is connected to the second inner flow channel of the workpiece.

8. The liquid injection clamp according to claim 7, characterized in that, The liquid injection clamp also includes a second positioning member (4), which is connected to the second clamping member (2) and abuts against the workpiece. The second positioning member (4) is provided with a second through hole (41), which is connected between the second liquid injection hole (21) and the second inner flow channel.

9. The liquid injection clamp according to claim 8, characterized in that, The liquid injection clamp also includes a second through member, which can pass through the second through hole (41) and the second liquid injection hole (21) and extend into the second inner flow channel.

10. A flow detection device, characterized in that, The device includes an injection mechanism, a detection element, and an injection clamp as described in any one of claims 1-9, wherein the injection mechanism injects liquid into the first inlet of the first inner flow channel, and the detection element is disposed at the first outlet of the first inner flow channel.

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