A peristaltic pump

Abstract

The present invention discloses a peristaltic pump, which includes a pump base, and a driving roller set is provided on the pump base; it further includes a pump tube surrounding the driving roller set, and a pressing block abutted against the outer side of the pump tube; a first sliding groove is provided on the pump base, a first guide rail is provided on the pressing block, and the first guide rail is slidably connected to the first sliding groove; it further includes an elastic mechanism for moving the pressing block along the extending direction of the first guide rail close to the pump tube. The first guide rail and the first sliding groove cooperate with each other to limit the freedom of movement of the pressing block during the working process of the peristaltic pump, reduce the irregular change of the gap between the pressing block and the driving roller set, and make the acting force direction of the elastic mechanism easier to be set to be coordinated with the change direction of the gap. The change direction of the gap and the acting force direction of the elastic mechanism can be set to be both along the extending direction of the first guide rail, reduce the flow error of the pump tube, and reduce the friction loss of the internal mechanism of the peristaltic pump.

Description

Technical Field

[0001] The present invention relates to the technical field of liquid pumps, in particular to the technical field of peristaltic pump structures. Background Art

[0002] Peristaltic pumps are widely used as quantitative components for analyzing liquid samples in institutions such as water quality analysis, environmental protection, research institutes, and universities. Traditional peristaltic pumps include fixed-gap pumps, which use a drive roller assembly to squeeze and isolate the pump tubing, forming a closed inner cavity to drive the liquid. A peristaltic pump's basic components include a pump base, a drive roller assembly, and pump tubing. The pump base secures the drive motor and pump tubing. The drive roller assembly includes the drive motor and a roller frame that rotates with the motor's output shaft. The roller frame is equipped with two or more cylindrical rollers to squeeze the pump tubing. The pump tubing is positioned between the rollers and the pressure block, where it is squeezed by these two components to form a closed inner cavity, enabling liquid transport. Fixed-gap peristaltic pumps provide uniform force distribution, unaffecting forward and reverse rotation. However, as the pump tubing wears, the fixed-gap pump body exerts less pressure on the tubing, gradually weakening its sealing properties and increasing flow rate errors. Summary of the Invention

[0003] In order to solve the above problems, the present invention aims to provide a peristaltic pump to reduce the flow error of the peristaltic pump.

[0004] To achieve the above object, the present invention is implemented according to the following technical solutions:

[0005] A peristaltic pump includes a pump seat, on which a drive roller group is provided; also includes a pump tube surrounding the drive roller group and a pressure block abutting the outer side of the pump tube; a first slide groove is provided on the pump seat, and a first guide rail is provided on the pressure block, and the first guide rail is slidably connected to the first slide groove; also includes an elastic mechanism that allows the pressure block to approach the pump tube along the extension direction of the first guide rail.

[0006] Preferably, the pressure block is provided with an abutment notch, the inner wall surface of the abutment notch abuts against the pump tube; the elastic mechanism includes a connecting rod arranged on the pump seat, the connecting rod is arranged along the extension direction of the first slide groove, and a compression elastic member is sleeved on the connecting rod; the elastic mechanism also includes a second slide groove arranged on the pressure block, the second slide groove is arranged along the extension direction of the first guide rail; the compression elastic member is arranged in the second slide groove, one end of the compression elastic member close to the abutment notch is fixedly connected to the second slide groove, and the other end of the compression elastic member away from the abutment notch is fixedly connected to the connecting rod.

[0007] Preferably, a third slide groove is provided on the pressure block, and the outer side surface of one end of the connecting rod is slidably connected to the groove wall surface of the third slide groove; the other end of the connecting rod away from the third slide groove is provided with a sliding section, and the outer side surface of the sliding section is slidably connected to the groove wall surface of the second slide groove.

[0008] Preferably, the diameter of the sliding section is larger than the diameter of the rod section of the connecting rod, the groove width of the second sliding groove is larger than the groove width of the third sliding groove, one end of the compression elastic member abuts against the sliding section, and the other end of the compression elastic member abuts against one end of the second sliding groove close to the third sliding groove.

[0009] Preferably, a connecting plate is provided at one end of the pump seat facing the abutment notch, a connecting through-hole is provided on the connecting plate, the side wall surface of the connecting rod abuts against the hole wall surface of the connecting through-hole, and a first abutment body is also provided on the connecting rod, the first abutment body abuts against the side of the connecting plate away from the abutment notch.

[0010] Preferably, the first abutment body includes an abutment plate, a connecting groove is provided on the abutment plate, the depth direction of the connecting groove is arranged along the thickness direction of the abutment plate, and the groove width of the connecting groove gradually increases; the connecting rod is provided with a first clamping groove extending along the circumferential direction of the connecting rod, the groove bottom wall of the first clamping groove abuts with the groove side wall at one end of the connecting groove, and the groove side wall of the first clamping groove abuts with the plate plane of the abutment plate.

[0011] Preferably, the connecting rod is provided with a second clamping groove extending in the axial direction of the connecting rod, and the second clamping groove is provided with a detachable clamping plate; a partition gap is provided between the pressure block and the connecting plate, and the clamping plate is arranged in the partition gap.

[0012] Preferably, a third clamping groove is provided on the connecting plate, and the third clamping groove extends along the plate thickness direction of the connecting plate, and the two ends of the third clamping groove are respectively connected to the two plate planes of the connecting plate; the third clamping groove includes a first groove section and a second groove section arranged in a direction away from the pressure block, and the groove width of the second groove section is greater than the groove width of the first groove section; the end of the pump pipe is provided with a second abutment body, and the second abutment body abuts against one end of the second groove section close to the first groove section, and the outer side of the second abutment body abuts against the groove side wall of the second groove section.

[0013] Preferably, the side surface of the pipe section of the pump pipe abuts against the groove wall surface of the first groove section.

[0014] Preferably, the second trough section includes a closing portion away from the bottom wall of the trough of the second trough section, and the pipe section of the pump pipe has a moving path along the closing portion toward the bottom wall of the trough of the second trough section.

[0015] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0016] The elastic mechanism can make the pressing block closer to the pump tube after the pump tube is worn, reducing the flow error caused by the wear of the pump tube. The first guide rail and the first sliding groove cooperate with each other to limit the movement freedom of the pressing block during the operation of the peristaltic pump, reducing the irregular change of the gap between the pressing block and the driving roller group, making it easier to set the acting direction of the elastic mechanism to be coordinated with the changing direction of the gap. The changing direction of the gap and the acting direction of the elastic mechanism can be set to both extend along the extension direction of the first guide rail, reducing the flow error of the pump tube and reducing the frictional loss of the internal mechanism of the peristaltic pump. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following will briefly introduce the drawings required for the description of the embodiments. Obviously, the drawings in the following description are some embodiments of the present invention. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0018] Figure 1 It is an exploded view of an embodiment of the peristaltic pump of the present invention.

[0019] Figure 2 It is a schematic perspective view of an embodiment of the peristaltic pump of the present invention.

[0020] Figure 3 It is a top view of an embodiment of the peristaltic pump of the present invention.

[0021] Wherein:

[0022] 1 - pump base, 11 - first sliding groove, 12 - connecting rod, 121 - sliding section, 122 - first abutting body, 1221 - abutting plate, 1222 - connecting through groove, 123 - first clamping groove, 124 - second clamping groove, 125 - clamping plate, 13 - compression elastic member, 14 - connecting plate, 141 - connecting through hole, 142 - third clamping groove, 1421 - first groove section, 1422 - second groove section, 1423 - closing part, 2 - driving roller group, 3 - pump tube, 31 - second abutting body, 4 - pressing block, 41 - first guide rail, 42 - abutting notch, 43 - second sliding groove, 44 - third sliding groove, 45 - separation gap. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0023] In order to more clearly understand the above objects, features, and advantages of the present invention, the present invention will be described in detail below in conjunction with the accompanying drawings and specific embodiments. It should be noted that, without conflict, the embodiments of the present application and the features in the embodiments can be combined with each other. In the following description, many specific details are set forth in order to fully understand the present invention. The described embodiments are only a part of the embodiments of the present invention, rather than all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without making creative efforts belong to the scope of protection of the present invention.

[0024] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those skilled in the technical field to which the present invention belongs. The terms used in the specification of the present invention herein are only for the purpose of describing specific embodiments and are not intended to limit the present invention.

[0025] Embodiment 1

[0026] As Figures 1 to 3 shown, this is an embodiment of the present invention. Specifically: a peristaltic pump includes a pump base 1, and a driving roller group 2 is provided on the pump base 1; it further includes a pump tube 3 surrounding the driving roller group 2 and a pressing block 4 abutting against the outer side of the pump tube 3; a first chute 11 is provided on the pump base 1, and a first guide rail 41 is provided on the pressing block 4, and the first guide rail 41 is slidably connected to the first chute 11; it further includes an elastic mechanism for making the pressing block 4 approach the pump tube 3 along the extending direction of the first guide rail 41.

[0027] Further as a preferred embodiment, the pressing block 4 is provided with an abutting notch 42, and the inner wall surface of the abutting notch 42 abuts against the pump tube 3; the elastic mechanism includes a connecting rod 12 provided on the pump base 1, the connecting rod 12 is arranged along the extending direction of the first chute 11, and a compression elastic member 13 is sleeved on the connecting rod 12; the elastic mechanism further includes a second chute 43 provided on the pressing block 4, and the second chute 43 is arranged along the extending direction of the first guide rail 41; the compression elastic member 13 is arranged in the second chute 43, one end of the compression elastic member 13 close to the abutting notch 42 is fixedly connected to the second chute 43, and the other end of the compression elastic member 13 away from the abutting notch 42 is fixedly connected to the connecting rod 12. As Figure 1As shown, the inner wall surface of the abutment notch 42 is set to be U-shaped, and the abutment notch 42 includes an arc segment at one end in the middle. The curvature radius of the arc segment is greater than the radius from the outside of the driving roller group 2 to its rotation center, so that the pump tube 3 is gradually flattened and compressed to a minimum in the middle of the arc segment of the abutment notch 42, so that the internal force of the peristaltic pump is more uniform and the service life is longer. The outer side of the connecting rod 12 and the inner wall of the second chute 43 work together to prevent the compression elastic member 13 from deforming to the side, so that the force of the compression elastic member 13 is more concentrated in the extension direction of the connecting rod 12, that is, more consistent with the movement direction of the pressure block 4, making the peristaltic pump more stable during operation. The compression elastic member 13 can be set as a compressed spring, elastic colloid, etc.

[0028] As a further preferred embodiment, the pressure block 4 is provided with a third chute 44. The outer side surface of one end of the connecting rod 12 is slidably connected to the wall surface of the third chute 44. The other end of the connecting rod 12, away from the third chute 44, is provided with a sliding section 121. The outer side surface of the sliding section 121 is slidably connected to the wall surface of the second chute 43. The cooperation between the two ends of the connecting rod 12 and the third chute 44 and the second chute 43, respectively, allows the pressure block 4 to move more smoothly along the connecting rod 12, reduces the impact of vibration of the pressure block 4 on the clearance of the pump tube 3, and improves the flow output accuracy of the flow pump.

[0029] Example 2

[0030] Different from Example 1, the diameter of the sliding section 121 is larger than the diameter of the rod section of the connecting rod 12, the groove width of the second slide groove 43 is larger than the groove width of the third slide groove 44, one end of the compression elastic member 13 abuts against the sliding section 121, and the other end of the compression elastic member 13 abuts against one end of the second slide groove 43 close to the third slide groove 44. This structure enables the pressure block 4 to approach the pump tube 3 more smoothly under the action of the compression elastic member 13, thereby improving the smoothness of the movement of the pressure block 4.

[0031] Example 3

[0032] Unlike Example 1, a connecting plate 14 is provided at the end of the pump base 1 facing the abutment notch 42. The connecting plate 14 is provided with a connecting through-hole 141. The side wall of the connecting rod 12 abuts against the wall of the connecting through-hole 141. The connecting rod 12 is also provided with a first abutting body 122, which abuts against the side of the connecting plate 14 facing away from the abutment notch 42. The connecting through-hole 141 limits the radial movement of the connecting rod 12. The abutment of the first abutting body 122 with the connecting plate 14 and the compression elastic member 13 work together to limit the movement of the pressure block in the direction approaching the pump tube 3.

[0033] Example 4

[0034] Different from Embodiment 3, the first abutting body 122 includes an abutting plate 1221. A connecting through groove 1222 is provided on the abutting plate 1221. The depth direction of the connecting through groove 1222 is arranged along the thickness direction of the abutting plate 1221, and the groove width of the connecting through groove 1222 gradually increases. A first clamping groove 123 extending along the circumferential direction of the connecting rod 12 is provided on the connecting rod 12. The bottom wall of the first clamping groove 123 abuts against the side wall of one end of the connecting through groove 1222, and the side wall of the first clamping groove 123 abuts against the plate plane of the abutting plate 1221. The connecting through groove 1222 can allow the connecting rod 12 to pass through the end with a larger groove width, and then move the connecting through groove 1222 in the direction of the narrowing groove width to achieve clamping with the first clamping groove 123 and axially clamping the connecting rod 12. The connecting through groove 1222 and the first clamping groove 123 make the installation of the connecting rod and the connecting plate 14 more convenient and fast.

[0035] Embodiment 5

[0036] Different from Embodiment 3, a second clamping groove 124 extending along the axial direction of the connecting rod 12 is provided on the connecting rod 12, and a detachable clamping plate 125 is provided on the second clamping groove 124. A separation gap 45 is provided between the pressing block 4 and the connecting plate 14, and the clamping plate 125 is arranged in the separation gap 45. By providing the second clamping groove 124 and the clamping plate 125, after the compression elastic member 13 is installed on the pressing block 4 and before it is installed on the connecting plate 14, the compression elastic member 13 can be prevented from ejecting the connecting rod 12, so that the pressing block 4, the compression elastic member 13, and the connecting rod 12 can be manufactured, installed, and stored separately as a component, enabling the overall manufacturing process of the peristaltic pump to be manufactured in parallel with other components, effectively reducing the overall manufacturing man-hours, reducing the manufacturing cost of the peristaltic pump, and also reducing the disassembled components during the maintenance of the peristaltic pump.

[0037] Embodiment 6

[0038] Different from Embodiment 3, a third clamping groove 142 is provided on the connecting plate 14. The third clamping groove 142 extends along the plate thickness direction of the connecting plate 14, and both ends of the third clamping groove + 142 are connected to the two plate planes of the connecting plate 14 respectively. The third clamping groove 142 includes a first groove section 1421 and a second groove section 1422 arranged in the direction away from the pressing block 4. The groove width of the second groove section 1422 is larger than that of the first groove section 1421. A second abutting body 31 is provided at the end of the pump tube 3. The second abutting body 31 abuts against one end of the second groove section 1422 close to the first groove section 1421, and the outside of the second abutting body 31 abuts against the side wall of the second groove section 1422. The first groove section 1421, the second groove section 1422 and the driving roller set 2 together limit the movement of the pump tube. This structure is convenient for disassembly and assembly, reducing the working time consumed for disassembly and assembly.

[0039] Embodiment 7

[0040] Different from Embodiment 6, the side surface of the pipe section of the pump pipe 3 abuts against the groove wall surface of the first groove section 1421, which can further fix the pump pipe 3 radially, reducing the flow error caused by the vibration of the pump pipe.

[0041] Embodiment 8

[0042] Different from Embodiment 6, the second groove section 1422 includes a necking portion 1423 away from the groove bottom wall of the second groove section 1422, and the pipe section of the pump pipe 3 has a moving path that moves along the necking portion 1423 towards the groove bottom wall of the second groove section 1422. The necking portion 1423 prevents the second abutting body 31 on the pump pipe 3 from laterally deviating out of the third clamping groove 142, ensuring the installation stability of the pump pipe 3. At this time, the pump pipe 3 can be installed downward through the pipe section laterally passing through the necking portion 1423, and then move along the axial direction of the pipe section until the second abutting body 31 abuts against one end of the second groove section 1422 close to the first groove section 1421 to complete the installation.

[0043] Embodiment 9

[0044] As Figures 1 to 3 shown, this is an embodiment of the present invention. Specifically: a peristaltic pump includes a pump base 1, and a driving roller group 2 is provided on the pump base 1; it further includes a pump pipe 3 surrounding the driving roller group 2, and a pressing block 4 abutting against the outer side of the pump pipe 3. The pressing block 4 is provided with an abutting notch 42, and the inner wall surface of the abutting notch 42 abuts against the pump pipe 3; a first sliding groove 11 is provided on the pump base 1, and a first guide rail 41 is provided on the pressing block 4. The first guide rail 41 is slidably connected with the first sliding groove 11; it further includes an elastic mechanism for moving the pressing block 4 closer to the pump pipe 3 along the extending direction of the first guide rail 41. The elastic mechanism includes a connecting rod 12 provided on the pump base 1. The connecting rod 12 is arranged along the extending direction of the first sliding groove 11, and a compression elastic member 13 is sleeved on the connecting rod 12; the elastic mechanism further includes a second sliding groove 43 provided on the pressing block 4. The second sliding groove 43 is arranged along the extending direction of the first guide rail 41; the compression elastic member 13 is arranged in the second sliding groove 43. One end of the compression elastic member 13 close to the abutting notch 42 is fixedly connected with the second sliding groove 43, and the other end of the compression elastic member 13 away from the abutting notch 42 is fixedly connected with the connecting rod 12. As Figure 1 shown, the inner wall surface of the abutting notch 42 is set to be U-shaped. The abutting notch 42 includes an arc section at the middle end, and the curvature radius of the arc section is greater than the radius from the outer side of the driving roller group 2 to its rotation center. The compression elastic member 13 can be set as a compressed spring, elastic colloid, etc.

[0045] The pressure block 4 is provided with a third chute 44. The outer side surface of one end of the connecting rod 12 is slidably connected to the wall surface of the third chute 44. The other end of the connecting rod 12, away from the third chute 44, is provided with a sliding section 121. The outer side surface of the sliding section 121 is slidably connected to the wall surface of the second chute 43. The diameter of the sliding section 121 is larger than the diameter of the rod section of the connecting rod 12. The width of the second chute 43 is larger than the width of the third chute 44. One end of the compression elastic member 13 abuts the sliding section 121, and the other end of the compression elastic member 13 abuts the end of the second chute 43 closest to the third chute 44.

[0046] The pump base 1 is provided with a connecting plate 14 at one end facing the abutment notch 42. The connecting plate 14 is provided with a connecting through-hole 141. The side wall surface of the connecting rod 12 abuts against the hole wall surface of the connecting through-hole 141. The connecting rod 12 is also provided with a first abutting body 122. The first abutting body 122 abuts against the side of the connecting plate 14 facing away from the abutment notch 42. The first abutting body 122 includes an abutting plate 1221. The abutting plate 1221 is provided with a connecting through-slot 1222. The depth direction of the connecting through-slot 1222 is arranged along the thickness direction of the abutting plate 1221, and the slot width of the connecting through-slot 1222 gradually increases. The connecting rod 12 is provided with a first clamping groove 123 extending along the circumferential direction of the connecting rod 12. The bottom wall of the first clamping groove 123 abuts against the groove sidewall at one end of the connecting through-slot 1222, and the groove sidewall of the first clamping groove 123 abuts against the plate plane of the abutting plate 1221.

[0047] The connecting rod 12 is provided with a second clamping groove 124 extending in the axial direction of the connecting rod 12 , and a detachable clamping plate 125 is provided on the second clamping groove 124 ; a partition gap 45 is provided between the pressure block 4 and the connecting plate 14 , and the clamping plate 125 is arranged in the partition gap 45 .

[0048] The connecting plate 14 is provided with a third engaging groove 142, which extends along the thickness direction of the connecting plate 14. The two ends of the third engaging groove 142 are respectively connected to the two plate planes of the connecting plate 14. The third engaging groove 142 includes a first groove section 1421 and a second groove section 1422, which are arranged in a direction away from the pressure block 4. The groove width of the second groove section 1422 is greater than the groove width of the first groove section 1421. The end of the pump tube 3 is provided with a second abutting body 31, which abuts the end of the second groove section 1422 closest to the first groove section 1421. The outer side of the second abutting body 31 abuts the groove sidewall of the second groove section 1422. The side surface of the pipe section of the pump tube 3 abuts the groove wall surface of the first groove section 1421. The second groove section 1422 includes a closing portion 1423 away from the groove bottom wall of the second groove section 1422 , and the pipe section of the pump pipe 3 has a moving path along the closing portion 1423 to move toward the groove bottom wall of the second groove section 1422 .

[0049] The sliding section 121 is provided with an internal threaded hole, and the outer side of the connecting rod 12 is provided with an external thread. The sliding section 121 is threadedly connected to the connecting rod 12. Optionally, the sliding section 121 is set to be independently arranged from the connecting rod 12, that is, detachable; through the threaded connection method, the sliding section 121 can be conveniently adjusted to further compress or loosen the compression elastic member 13, conveniently and quickly adjust the gap of the pump tube 3, and conveniently and quickly adjust the flow accuracy of the peristaltic pump.

[0050] During installation, first install the pump tube 3 on the pump base 1. The pump tube 3 can be installed downward through the necking part 1423 laterally through the pipe section, and then move along the axial direction of the pipe section until the second abutting body 31 abuts against the end of the second groove section 1422 close to the first groove section 1421 to complete the installation. At the same time, the pressing block 4, the compression elastic member 13, and the clamping plate 125 can be installed to form a separate component, and then installed on the pump base 1, the motor, and the driving roller set 2, and then snapped into the first abutting body 122 through the connection through groove 1222 and the first clamping groove 123 on the pump tube 3 to complete the overall installation of the peristaltic pump. The whole installation process is convenient and fast.

[0051] The above is only a preferred embodiment of the present invention, and it does not impose any form of limitation on the present invention. Therefore, any modification, equivalent change, and modification made to the above embodiments based on the technical essence of the present invention without departing from the content of the technical solution of the present invention still fall within the scope of the technical solution of the present invention.

Claims

1. A peristaltic pump, characterized in that, The invention comprises a pump base, on which a driving roller assembly is provided; a pump pipe surrounding the driving roller assembly and a pressure block abutting against the outer side of the pump pipe; a first slide groove is provided on the pump base, and a first guide rail is provided on the pressure block, wherein the first guide rail is slidably connected to the first slide groove; and an elastic mechanism is further provided for bringing the pressure block closer to the pump pipe along the extension direction of the first guide rail. The pressure block is provided with an abutment notch, and the inner wall surface of the abutment notch abuts against the pump pipe; the elastic mechanism includes a connecting rod provided on the pump seat, the connecting rod is provided along the extension direction of the first slide groove, and a compression elastic member is sleeved on the connecting rod; the elastic mechanism also includes a second slide groove provided on the pressure block, the second slide groove is provided along the extension direction of the first guide rail; the compression elastic member is provided in the second slide groove, one end of the compression elastic member close to the abutment notch is fixedly connected to the second slide groove, and the other end of the compression elastic member away from the abutment notch is fixedly connected to the connecting rod; The pressing block is provided with a third sliding groove, and the outer side surface of one end of the connecting rod is slidably connected to the groove wall surface of the third sliding groove; the other end of the connecting rod away from the third sliding groove is provided with a sliding section, and the outer side surface of the sliding section is slidably connected to the groove wall surface of the second sliding groove; The diameter of the sliding section is larger than the diameter of the rod section of the connecting rod, the groove width of the second sliding groove is larger than the groove width of the third sliding groove, one end of the compression elastic member abuts against the sliding section, and the other end of the compression elastic member abuts against an end of the second sliding groove close to the third sliding groove; The sliding section is provided with an internal threaded hole, the outer side of the connecting rod is provided with an external thread, and the sliding section is threadedly connected to the connecting rod; The pump base is provided with a connecting plate at one end facing the abutting notch, the connecting plate is provided with a connecting through-hole, the side wall surface of the connecting rod abuts against the hole wall surface of the connecting through-hole, and the connecting rod is further provided with a first abutting body, the first abutting body abuts against a side of the connecting plate away from the abutting notch; The first abutment body includes an abutment plate, the abutment plate is provided with a connecting through-slot, the depth direction of the connecting through-slot is arranged along the thickness direction of the abutment plate, and the slot width of the connecting through-slot gradually increases; the connecting rod is provided with a first clamping groove extending along the circumferential direction of the connecting rod, the groove bottom wall of the first clamping groove abuts with the groove side wall of one end of the connecting through-slot, and the groove side wall of the first clamping groove abuts with the plate plane of the abutment plate; The connecting rod is provided with a second clamping groove extending in the axial direction of the connecting rod, and the second clamping groove is provided with a detachable clamping plate; a space is provided between the pressure block and the connecting plate, and the clamping plate is arranged in the space; The connecting plate is provided with a third clamping groove, the third clamping groove extends along the plate thickness direction of the connecting plate, and both ends of the third clamping groove are respectively connected to the two plate planes of the connecting plate; the third clamping groove includes a first groove section and a second groove section arranged in a direction away from the pressing block, and the groove width of the second groove section is greater than that of the first groove section; the end of the pump pipe is provided with a second abutting body, the second abutting body abuts against one end of the second groove section close to the first groove section, and the outer side of the second abutting body abuts against the groove side wall of the second groove section; The side surface of the pipe section of the pump pipe abuts against the groove wall surface of the first groove section; The second groove section includes a closing part away from the groove bottom wall of the second groove section, and the pipe section of the pump pipe has a moving path moving along the closing part towards the groove bottom wall of the second groove section.

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