Peristaltic pump

Abstract

The utility model discloses a peristaltic pump which comprises a pump wheel assembly, a driving assembly and a pump pipe assembly, and is characterized in that the driving assembly comprises a transmission shaft provided with a first limiting structure; the pump wheel assembly comprises a pump wheel frame, a pump wheel and a flexible connecting mechanism, the pump wheel frame is provided with a shaft hole matched with the transmission shaft, the flexible connecting mechanism comprises a second limiting structure and an elastic element, and the second limiting structure and the elastic element are arranged on the pump wheel frame. The first end of the second limiting structure is in limiting fit with the first limiting structure, and the second end of the second limiting structure elastically abuts against the pump wheel frame through a pre-compressed elastic element. By arranging the flexible connecting mechanism, during installation, only the transmission shaft needs to be inserted into the shaft hole, stable connection can be ensured through the elastic abutting effect of the elastic element, and complex alignment and large assembling force are not needed; and during disassembly, the transmission shaft can be easily pulled out of the shaft hole only by overcoming the elasticity of the elastic element, so that the assembly and disassembly efficiency is remarkably improved.

Description

Technical Field

[0001] This utility model relates to the field of peristaltic pump technology, and specifically to a peristaltic pump. Background Technology

[0002] A peristaltic pump is a positive displacement pump that delivers fluid by periodically squeezing an elastic tubing. Its core principle is to use a rotor or pressure block to alternately squeeze and release the tubing, creating a directional flow of fluid. Because the fluid flows only within the tubing and the pump body has no direct contact with the fluid, it features pollution-free operation, easy maintenance, and high-precision delivery.

[0003] The core components of a peristaltic pump include the pump body, pump head, and hose. In practical use, the pump head needs to be frequently disassembled to replace the hose, clean, or maintain it. However, in existing technologies, the peristaltic pump head and pump body are generally connected by rigid methods such as screw fastening, bolt connection, or rigid clips. The disassembly operation of rigid connections is cumbersome and inefficient, and the sealing reliability is insufficient, which can easily damage the device. Utility Model Content

[0004] The main purpose of this invention is to provide a peristaltic pump that solves the problem that existing peristaltic pumps with rigid connections are prone to damage.

[0005] To achieve the above objectives, this utility model proposes a peristaltic pump, including a pump wheel assembly, a drive assembly, and a pump tube assembly. The drive assembly includes a drive shaft with a first limiting structure. The pump wheel assembly includes a pump wheel frame, a pump wheel, and a flexible connecting mechanism. The pump wheel frame has a shaft hole that mates with the drive shaft. The flexible connecting mechanism includes a second limiting structure and an elastic element disposed on the pump wheel frame. When the drive shaft is assembled on the shaft hole, the first end of the second limiting structure forms a limiting fit with the first limiting structure, and the second end elastically abuts against the pump wheel frame through a pre-compressed elastic element.

[0006] Preferably, a limiting groove is provided on one side of the pump wheel frame corresponding to the position of the first limiting structure. One end of the limiting groove is connected to the shaft hole. The elastic element and the second limiting structure are both housed in the limiting groove. The end of the elastic element away from the second limiting structure abuts against the bottom surface of the limiting groove.

[0007] Preferably, the first limiting structure is an arc-shaped groove, and the second limiting structure is a first fixing pin, wherein the curvature of the first fixing pin matches the arc-shaped groove.

[0008] Preferably, the elastic element is a spring sheet, including a base plate portion that is attached to the bottom surface of the limiting groove, and an elastic arm portion that is bent and closed from both sides of the base plate portion toward the middle, and the first fixing pin abuts against the elastic arm portion.

[0009] Preferably, the shaft hole is a D-shaped hole, the transmission shaft is a D-shaped shaft, the arc-shaped groove is formed on the plane of the D-shaped shaft, and the limiting groove is formed on one side of the plane of the D-shaped hole.

[0010] Preferably, the flexible connection mechanism and the limiting groove are disposed on the side of the pump wheel frame that is in contact with the drive assembly.

[0011] Preferably, the pump wheel assembly further includes a pump wheel cover disposed on the side of the pump wheel frame that is in contact with the drive assembly, the pump wheel cover being provided with a first through hole for the drive shaft to pass through, and the pump wheel cover being provided with a fixing member for fixing the pump wheel frame.

[0012] Preferably, the pump tube assembly includes a pump tube, a pump tube connector with one end inserted into the end of the pump tube, and a locking sleeve covering the outer periphery of the pump tube connector. The pump tube connector is provided with a flow channel that communicates with the pump tube.

[0013] Preferably, the pump pipe connector is a flexible structure, and the end of the pump pipe connector inserted into the pump pipe is a tapered connector, wherein the maximum outer diameter of the tapered connector is greater than the inner diameter of the pump pipe.

[0014] Preferably, the pump wheel assembly further includes a pump housing for fixing a pump pipe assembly wound around the outside of the pump wheel. The pump housing is symmetrically provided with second through holes for the pump pipe to pass through. The locking sleeve is provided with a flange on its outer periphery, and the edge of the second through hole is provided with a limiting step adapted to the flange.

[0015] This invention utilizes a flexible connection mechanism, incorporating a first limiting structure on the drive shaft, a second limiting structure of the pump's flexible connection mechanism, and an elastic element to form a flexible fixing structure. During installation, simply inserting the drive shaft into the shaft hole allows the first and second limiting structures to automatically engage, while the elastic abutment of the elastic element ensures a stable connection, eliminating the need for complex alignment and significant assembly force. During disassembly, overcoming the elastic force of the elastic element is sufficient to easily pull the drive shaft out of the shaft hole, significantly improving installation and disassembly efficiency and reducing equipment maintenance difficulty. Attached Figure Description

[0016] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without creative effort.

[0017] Figure 1 This is a schematic diagram of the overall structure of the peristaltic pump of this utility model;

[0018] Figure 2 This is a cross-sectional view of the peristaltic pump of this utility model;

[0019] Figure 3 This is an exploded view of the peristaltic pump of this utility model;

[0020] Figure 4 This is a schematic diagram of the stepper motor structure of this utility model;

[0021] Figure 5 This is an exploded view of the pump wheel assembly of this utility model;

[0022] Figure 6 This is a schematic diagram of the elastic sheet structure of this utility model;

[0023] Figure 7 This is a schematic diagram of the pump pipe assembly structure of this utility model.

[0024] Explanation of icon numbers:

[0025] 1 Driver components 203 Pump wheel gland 2312 Elastic arm 10 Stepper motor 204 First through hole 232 First fixed pin 101 transmission shaft 21 Pump wheel 3 Pump tubing assembly 102 arc groove 211 Second fixing pin 30 pump pipe 11 Motor mounting plate 22 pump casing 31 Pump pipe joint 2 Pump wheel assembly 221 Second through hole 311 tapered joint 20 Pump wheel frame 23 Flexible connection mechanism 32 Locking sleeve 201 Shaft Hole 231 shrapnel 321 flange 202 Limiting groove 2311 Board part

[0026] The realization of the purpose, functional features and advantages of this utility model will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation

[0027] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0028] It should be noted that if the embodiments of this utility model involve directional indicators (such as up, down, left, right, front, back, etc.), the directional indicators are only used to explain the relative positional relationship and movement of the components in a certain specific posture (as shown in the figure). If the specific posture changes, the directional indicators will also change accordingly.

[0029] Furthermore, if the embodiments of this utility model involve descriptions such as "first" or "second," these descriptions are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, features defined with "first" or "second" may explicitly or implicitly include at least one of those features. Additionally, if the word "and / or" appears throughout the text, it means including three parallel solutions; for example, "A and / or B" includes solution A, solution B, or a solution that simultaneously satisfies A and B. Furthermore, the technical solutions of the various embodiments can be combined with each other, but this must be based on the ability of those skilled in the art to implement them. When the combination of technical solutions is contradictory or impossible to implement, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection claimed by this utility model.

[0030] Combined with appendix Figure 1-7 This utility model proposes a peristaltic pump, including a pump wheel assembly 2, a drive assembly 1, and a pump tube assembly 3. The drive assembly 1 includes a drive shaft 101 with a first limiting structure. The pump wheel assembly 2 includes a pump wheel frame 20, a pump wheel 21, and a flexible connecting mechanism 23. The pump wheel frame 20 has a shaft hole 201 that mates with the drive shaft 101. The flexible connecting mechanism 23 includes a second limiting structure and an elastic element disposed on the pump wheel frame 20. When the drive shaft 101 is assembled on the shaft hole 201, the first end of the second limiting structure forms a limiting fit with the first limiting structure, and the second end elastically abuts against the pump wheel frame 20 through a pre-compressed elastic element.

[0031] Specifically, in this invention, the pump wheel assembly 2 includes a pump wheel frame 20 and a pump wheel 21. The pump wheel 21 is mounted on the pump wheel frame 20 via a second fixing pin 211. The pump wheel 21 is used to squeeze the pump tube assembly 3 under the action of the drive assembly 1, thereby achieving fluid control. In this embodiment, the number of pump wheels 21 and corresponding second fixing pins 211 is five, evenly distributed on the pump wheel frame 20. In other embodiments, the number of pump wheel assemblies 2 can be set more or less as needed. In this invention, the drive assembly 1 includes a stepper motor 10 and a motor mounting plate 11. The stepper motor 10 is fixed to the motor mounting plate 11 by screws.

[0032] By setting up a flexible connection mechanism 23, a flexible fixing structure is formed by the first limiting structure on the drive shaft 101, the second limiting structure of the pump flexible connection mechanism 23, and the elastic element. During installation, the drive shaft 101 is simply inserted into the shaft hole 201, and the first and second limiting structures automatically form a limiting fit, thereby limiting the relative position between the drive shaft 101 and the pump wheel frame 20 and ensuring the accuracy of power transmission. The second end of the second limiting structure elastically abuts against the pump wheel frame 20 through a pre-compressed elastic element. The elastic deformation capability of the elastic element provides a flexible buffer for the connection structure, effectively absorbing the stress generated during operation. The elastic abutment of the elastic element ensures a stable connection without the need for complex alignment or large assembly force. During disassembly, the drive shaft 101 can be easily pulled out of the shaft hole 201 by overcoming the elastic force of the elastic element, significantly improving installation and disassembly efficiency and reducing equipment maintenance difficulty.

[0033] Furthermore, in conjunction with the appendix Figure 5 The pump wheel frame 20 is provided with a limiting groove 202 on one side corresponding to the position of the first limiting structure. One end of the limiting groove 202 is connected to the shaft hole 201. The elastic element and the second limiting structure are both housed in the limiting groove 202. The end of the elastic element away from the second limiting structure abuts against the bottom surface of the limiting groove 202.

[0034] In this invention, a limiting groove 202 is provided in the pump wheel frame 20 to accommodate the flexible connecting mechanism 23. The limiting groove 202 is located on one side of the first limiting structure, and one end of the elastic element abuts against the bottom surface of the limiting groove 202 so that the elastic element provides elastic force. The limiting groove 202 is provided on the pump wheel frame 20, which simplifies the structure of the pump wheel assembly 2 and facilitates its assembly with the drive assembly 1. In other possible embodiments, an additional fixing structure can be added to fix the flexible connecting mechanism 23. The corresponding fixing structure can be set between the pump wheel frame 20 and the drive assembly 1.

[0035] Combination Figure 4 and Figure 5To facilitate the cooperation between the first and second limiting structures and without affecting the movement of the pump wheel 21 driven by the drive assembly 1, in this embodiment, the first limiting structure is an arc-shaped groove 102 formed on the drive shaft 101, and the second limiting structure is a first fixing pin 232. The first fixing pin 232 is placed laterally, and the surface curvature of its cylinder matches the arc-shaped groove 102, so that the two are engaged and limited. At the same time, this method can also reduce the impact of the first and second limiting structures on the operation of the peristaltic pump. In other embodiments, the second limiting structure can also be a ball bearing that matches the outer surface of the arc-shaped groove 102; or, the first limiting structure can be a square groove, and the second limiting structure can be a protrusion that matches the square groove or a ball bearing that can fall into the square groove, etc.

[0036] Combined with appendix Figure 6 In an optional embodiment of this utility model, the elastic element is a spring sheet 231, including a base plate portion 2311 that fits against the bottom surface of the limiting groove 202, and an elastic arm portion 2312 that bends and closes from both sides of the base plate portion 2311 towards the middle. The first fixing pin 232 abuts against the elastic arm portion 2312. The base plate portion 2311 is a plane that fits against the bottom surface of the limiting groove 202, and the elastic arm portion 2312 provides a corresponding restoring force to the first fixing pin 232. The elastic element can also be a spring, a rubber elastomer, or other elastic components.

[0037] In one embodiment of this utility model, the shaft hole 201 is a D-shaped hole, the transmission shaft 101 is a D-shaped shaft, the arc-shaped groove 102 is formed on the plane of the D-shaped shaft, and the limiting groove 202 is formed on one side of the plane of the D-shaped hole. This matching method of the D-shaped hole and the D-shaped shaft can effectively prevent the failure of the spring piece 231 caused by relative rotation between the transmission shaft 101 and the pump wheel frame 20, ensuring stable power transmission. At the same time, it can achieve flexible fixation in conjunction with the flexible connection mechanism 23. Furthermore, the choice of the D-shaped shaft also facilitates the selection of the position of the flexible connection structure, and the corresponding arc-shaped groove 102 is formed on the plane of the D-shaped shaft, making the corresponding process simpler.

[0038] In this embodiment, the flexible connecting mechanism 23 and the limiting groove 202 are disposed on the side of the pump wheel frame 20 that is in contact with the drive assembly 1, specifically on the bottom surface of the pump wheel frame 20. Further, the pump wheel assembly 2 also includes a pump wheel cover 203 disposed on the side of the pump wheel frame 20 that is in contact with the drive assembly 1. The pump wheel cover 203 has a first through hole 204 for the drive shaft 101 to pass through, the shape of the first through hole 204 being the same as the shape of the shaft hole 201. The pump wheel cover 203 has a fixing member for fixing the pump wheel frame 20. Specifically, the bottom surface of the pump wheel frame 20 may have a groove for accommodating the pump wheel cover 203, and the pump wheel cover 203 is disposed within the groove. The pump wheel cover 203 is used to prevent the flexible connecting mechanism 23 and the second fixing pin 211 from slipping out. The corresponding fixing member can be a screw, etc.

[0039] Combined with appendix Figure 7 The pump tube assembly 3 of this utility model includes a pump tube 30, a pump tube connector 31 with one end inserted into the end of the pump tube 30, and a locking sleeve 32 covering the outer periphery of the pump tube connector 31. The pump tube connector 31 is provided with a flow channel communicating with the pump tube 30. The pump tube assembly 3 is made with a detachable pump tube 30, which is convenient for installation and disassembly. When replacing the pump tube assembly 3, only the pump tube 30 that has reached the end of its service life needs to be scrapped. The pump tube connector 31 and the locking sleeve 32 can be recycled, which greatly saves the cost of using the pump tube assembly 3.

[0040] For the pump tube assembly 3, the pump tube connector 31 has a flexible structure. The end of the pump tube connector 31 that is inserted into the pump tube 30 is a tapered connector 311, and the maximum outer diameter of the tapered connector 311 is larger than the inner diameter of the pump tube 30. The tapered connector 311 structure makes the pump tube 30 more stable after installation, and the tapered inverted structure makes the pump tube 30 relatively difficult to pull out after installation. In addition, the internal structure of the locking sleeve 32 further enhances the firmness of the pump tube 30 after installation, ensuring the accuracy and stability of the peristaltic pump during use. When the pump tube 30 reaches the end of its service life, it can be pulled out with considerable force. The locking sleeve 32 and the pump tube connector 31 can be interference-fitted. The locking sleeve 32 covers the end of the pump tube connector 31 exposed on the outside of the pump tube 30. The locking sleeve 32 can further fix the connection and prevent the pump tube connector 31 from being contaminated, thereby affecting the fluid inside the pump tube assembly 3.

[0041] Combined with appendix Figure 2Preferably, the pump wheel assembly 2 further includes a pump housing 22, which is used to fix the pump pipe assembly 3 wrapped around the outside of the pump wheel 21. The pump housing 22 is symmetrically provided with second through holes 221 for the pump pipe 30 to pass through. The locking sleeve 32 is provided with a flange 321 on its outer periphery. The edge of the second through hole 221 of the pump housing 22 is provided with a limiting step (not shown in the figure) that matches the flange 321. The flange 321 and the limiting step cooperate to facilitate the fixing of the pump pipe assembly 3.

[0042] The peristaltic pump of this invention features a flexible connection between the pump head and the driver in the pump wheel assembly 2, and a detachable structure in the pump tube assembly 3. The peristaltic pump is easy to disassemble and install, and can save on corresponding operating costs.

[0043] The above description is only an optional embodiment of the present utility model and does not limit the patent scope of the present utility model. All equivalent structural transformations made under the inventive concept of the present utility model using the contents of the present utility model specification and drawings, or direct / indirect applications in other related technical fields, are included within the patent protection scope of the present utility model.

Claims

1. A peristaltic pump, comprising a pump impeller assembly, a drive assembly, and a pump tubing assembly, characterized in that, The drive assembly includes a drive shaft with a first limiting structure; the pump wheel assembly includes a pump wheel frame, a pump wheel, and a flexible connection mechanism. The pump wheel frame has a shaft hole that mates with the drive shaft. The flexible connection mechanism includes a second limiting structure and an elastic element located on the pump wheel frame. When the drive shaft is assembled onto the shaft hole, the first end of the second limiting structure forms a limiting fit with the first limiting structure, and the second end elastically abuts against the pump wheel frame through a pre-compressed elastic element.

2. The peristaltic pump according to claim 1, characterized in that, The pump wheel frame is provided with a limiting groove on one side corresponding to the position of the first limiting structure. One end of the limiting groove is connected to the shaft hole. The elastic element and the second limiting structure are both housed in the limiting groove. The end of the elastic element away from the second limiting structure abuts against the bottom surface of the limiting groove.

3. The peristaltic pump according to claim 2, characterized in that, The first limiting structure is an arc-shaped groove, and the second limiting structure is a first fixing pin, the curvature of which matches the arc-shaped groove.

4. The peristaltic pump according to claim 3, characterized in that, The elastic element is a spring sheet, including a base plate portion that is attached to the bottom surface of the limiting groove, and an elastic arm portion that is bent and closed from both sides of the base plate portion to the middle, and the first fixing pin abuts against the elastic arm portion.

5. The peristaltic pump according to claim 4, characterized in that, The shaft hole is a D-shaped hole, the drive shaft is a D-shaped shaft, the arc-shaped groove is formed on the plane of the D-shaped shaft, and the limiting groove is formed on one side of the plane of the D-shaped hole.

6. The peristaltic pump according to claim 5, characterized in that, The flexible connection mechanism and the limiting groove are disposed on the side of the pump wheel frame that is attached to the drive component.

7. The peristaltic pump according to claim 6, characterized in that, The pump wheel assembly further includes a pump wheel cover disposed on the side of the pump wheel frame that is in contact with the drive assembly. The pump wheel cover is provided with a first through hole for the drive shaft to pass through, and a fixing member is provided on the pump wheel cover for fixing the pump wheel frame.

8. The peristaltic pump according to any one of claims 1-7, characterized in that, The pump tube assembly includes a pump tube, a pump tube connector that is inserted into the end of the pump tube, and a locking sleeve that covers the outer periphery of the pump tube connector. The pump tube connector is provided with a flow channel that communicates with the pump tube.

9. The peristaltic pump according to claim 8, characterized in that, The pump pipe connector is a flexible structure. The end of the pump pipe connector that is inserted into the pump pipe is a tapered connector, and the maximum outer diameter of the tapered connector is greater than the inner diameter of the pump pipe.

10. The peristaltic pump according to claim 8, characterized in that, The pump wheel assembly also includes a pump housing, which is used to fix a pump pipe assembly wrapped around the outside of the pump wheel. The pump housing is symmetrically provided with a second through hole for the pump pipe to pass through. The locking sleeve is provided with a flange on its outer periphery, and the edge of the second through hole is provided with a limiting step adapted to the flange.

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