Pump head of peristaltic pump

Abstract

The utility model relates to the technical field of peristaltic pumps, in particular to a pump head of a peristaltic pump, which comprises a pump head body, pump wheel supports, pump wheels and guide pins, the pump wheel supports are arranged on two sides of the pump head body, and the pump wheels are rotatably connected onto the pump wheel supports; one end of the pump wheel support is connected with the pump head body through a connecting shaft, and the other end of the pump wheel support is connected with the pump head body through a connecting piece. The outer side of the connecting piece abuts against a fastening piece. On the basis of an existing pump head structure, a connecting structure of the pump wheel support and the pump wheel body is improved, the fastener abuts against the outer side of the connecting piece at one end, so that the connecting piece keeps pretightening force, the connecting piece cannot be loosened, and the service life of the pump wheel is not affected; the initial position of the pump impeller is directly controlled through the length of the fastener, and installation and operation are convenient.

Description

Technical Field

[0001] The utility model relates to the technical field of peristaltic pumps, in particular to a peristaltic pump head. Background Art

[0002] The hemodialysis machine is one of the important equipment for hemodialysis treatment, and the peristaltic pump is an important part of the hemodialysis machine. Hemodialysis is controlled by the hemodialysis machine, using a dedicated disposable hemodialysis line, and the peristaltic pump generates negative pressure to draw blood out of the human body, then flows through the dialysis instrument, and then flows back to the human body after being purified by the dialysate.

[0003] A peristaltic pump is usually composed of a driver, a pump head, and a pump chamber. The driver provides power to drive the pump head to rotate. A pump wheel is installed on the pump head, and a pump tube is placed in the pump chamber. When the pump head rotates in the pump chamber, the pump wheel squeezes and releases the pump tube alternately to transport blood. Figure 1 As shown, the main components include a pump head body, a pump wheel bracket, a pump wheel and a guide pin. Pump wheel brackets are arranged on the left and right sides of the pump head body. A pump wheel is hinged on the pump wheel bracket. One end of the pump wheel bracket hinged with the pump wheel is hinged to the pump head body, and the other end of the pump wheel bracket is connected to the pump head body by screws. The guide pins are arranged on the front and back sides of the pump head body.

[0004] The existing peristaltic pump head has the following problems: 1. Figure 2 As shown, the initial position of the pump wheel is controlled by the screw engagement length between the pump wheel bracket and the pump head body, which is not conducive to production consistency and requires the use of tooling to ensure it. The installation is complicated, and when the pump wheel bracket is in a compressed state, the screws are in a non-threaded pre-tightened stress state. Repeated compression will also cause the screws to loosen, affecting the service life of the pump head; 2. The other end of the pump wheel bracket rotates on the shaft hinged on the pump wheel body. In order to prevent the shaft from falling out, the shaft is usually installed by interference fit, but this method is complicated to install and inconvenient to operate; another method is to use threaded connection, but the screws are easy to loosen, affecting the stability of the structure and the service life of the pump head. Utility Model Content

[0005] The purpose of the present invention is to solve at least one problem existing in the above-mentioned prior art. For example, one of the purposes of the present invention is to solve the problem that the existing pump head structure is prone to loosening, which affects the service life.

[0006] The purpose of the utility model is achieved through the following technical scheme: a peristaltic pump head, a pump head body, a pump wheel bracket, a pump wheel and a guide pin, pump wheel brackets are provided on both sides of the pump head body, and the pump wheel is rotatably connected to the pump wheel bracket; one end of the pump wheel bracket is connected to the pump head body through a connecting shaft, and the other end is connected to the pump head body through a connecting piece, the connecting piece is inserted into the mounting holes of the pump head body and the pump wheel bracket, a fastener is abutted on the outside of the connecting piece, and an elastic piece is provided on the outer sleeve of the fastener.

[0007] The principle of the utility model is that the center of the pump head body is connected to the driver through a power shaft, and the driver can drive the pump head to rotate when it is started. The pump wheel is hinged to the pump wheel bracket through a hinge shaft, and the pump wheel bracket is arranged on both sides of the pump head body, so that the pump wheel is symmetrically arranged on both sides of the pump head body. When the pump head rotates, the pump wheel can alternately squeeze the pump tube. Guide pins are connected to the front and back sides or the left and right sides of the pump head body to keep the pump tube in the correct position. One end of the pump impeller bracket and the pump head body form a rotating pair through a connecting shaft, and the other end of the pump impeller bracket is connected to the pump head body through a connecting piece, and the outside of the connecting piece abuts against a fastener. The initial position of the pump impeller is controlled by the length of the fastener between the pump impeller bracket and the pump head body. The elastic piece arranged outside the connecting piece is between the pump impeller bracket and the pump head body. As the pump head body rotates, the elastic piece can limit the rotation angle range of the pump impeller bracket. The pump impeller bracket is continuously compressed and rebounded through the elastic piece during the process of the pump head rotating and squeezing the pump tube. The fastener abutting against the outside of the connecting piece ensures that the connecting piece always maintains a pre-tightened state and is not easy to loosen and affect the service life of the pump head.

[0008] Furthermore, the connecting member includes a first connecting portion and a second connecting portion, the first connecting portion is clamped with the pump wheel bracket, and the outer side of the second connecting portion abuts against the fastener.

[0009] Furthermore, the connecting piece is a T-shaped structure as a whole, including a first connecting portion and a second connecting portion, the first connecting portion is clamped with the pump wheel bracket, and a fastener is abutted against the outside of the second connecting portion.

[0010] Furthermore, both ends of the connecting shaft are riveted to the pump wheel bracket.

[0011] Furthermore, the connecting shaft is a hollow shaft.

[0012] Further, the guide pin is arranged on the left side and / or the right side of the pump wheel.

[0013] Furthermore, bosses are provided on both sides of the pump head body.

[0014] Furthermore, a sensing device is provided at the lower end of the boss.

[0015] Furthermore, a handle is provided on the top of the pump head body.

[0016] The beneficial effects of the utility model are as follows: on the basis of the existing pump head structure, the utility model improves the connection structure of the impeller bracket and the impeller body, abuts against the fastener on the outside of the connecting piece at one end, so that the connecting piece maintains a pre-tightening force, the connecting piece will not loosen, and the service life of the impeller will not be affected; the initial position of the impeller is directly controlled by the length of the fastener, and installation and operation are convenient. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the utility model will be further described below in conjunction with the accompanying drawings and embodiments. The drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work:

[0018] Figure 1 It is a structural schematic diagram of an existing peristaltic pump head;

[0019] Figure 2 It is a schematic diagram of the connection between the pump wheel bracket and the pump head body in the existing peristaltic pump head;

[0020] Figure 3 It is a structural schematic diagram of the utility model;

[0021] Figure 4 It is the front view of the utility model;

[0022] Figure 5 It is a left view of the utility model;

[0023] Figure 6 It is a right view of the utility model;

[0024] Figure 7 It is a structural schematic diagram of the connecting shaft of the utility model;

[0025] Figure 8 It is a bottom view of the utility model;

[0026] Fig. 9 It is a structural schematic diagram of the cooperation between the pump head and the pump tube of the utility model peristaltic pump.

[0027] In the figure: 1. Pump head body; 2. Pump wheel bracket; 3. Pump wheel; 4. Guide pin; 5. Connecting shaft; 6. Connecting piece; 7. Elastic piece; 601. First connecting part; 602. Second connecting part; 8. Fastener; 9. Guide shaft; 10. Boss; 11. Induction device; 12. Handle. DETAILED DESCRIPTION

[0028] In order to make the purpose, technical solution and advantages of the embodiments of the utility model clearer, the following will be described clearly and completely in combination with the technical solution in the embodiments of the utility model. Obviously, the described embodiments are partial embodiments of the utility model, not all embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the protection scope of the utility model.

[0029] like Figure 3 , Figure 5 As shown, a peristaltic pump head includes a pump head body 1, a pump wheel bracket 2, a pump wheel 3 and a guide pin 4. The pump head body 1 is provided with a pump wheel bracket 2 and a guide pin 4 on both sides, and the pump wheel 3 is rotatably connected to the pump wheel bracket 2; one end of the pump wheel bracket 2 is connected to the pump head body 1 through a connecting shaft 5, and the other end is connected to the pump head body 1 through a connecting member 6. The connecting member 6 is inserted into the mounting holes of the pump head body 1 and the pump wheel bracket 2, and a fastener 8 is abutted on the outer side of the connecting member 6, and an elastic member 7 is provided on the outer sleeve of the fastener 8.

[0030] The pump head body 1 is connected to the driver through a power shaft, and the driver can drive the pump head to rotate when it is started. Figure 4 To describe the directions of various components as a reference, the pump wheel bracket 2 is arranged on the front and rear sides of the pump head body 1, the guide pin 4 can be connected to the pump head body 1, and can also be connected to the pump wheel bracket 2, and the position of the guide pin 4 can be set on the front and rear sides relative to the pump head body 1, and can also be set on the left and right sides; the pump wheel 3 is hinged to the pump wheel bracket 2 through a hinge shaft, and the pump wheel 3 is symmetrically arranged on the front and rear sides of the pump head body 1. When the pump head rotates, the pump wheel 3 can realize alternating squeezing of the pump tube. One end of the pump wheel bracket 2 forms a rotating pair with the pump head body 1 through the connecting shaft 5, and the other end of the pump wheel bracket 2 is connected to the pump head body 1 through the connecting piece 6. The outer side of the connecting piece 6 abuts against the fastener 8, and the outer side of one end of the fastener 8 abuts against the pump head body 1. The initial position of the pump wheel 3 is controlled by the length of the fastener 8 between the pump wheel bracket 2 and the pump head body 1. The elastic member 7 disposed on the outer surface of the fastener 8 is between the pump wheel bracket 2 and the pump head body 1. As the pump head body 1 rotates, the pump wheel bracket 2 is continuously compressed and rebounded by the elastic member 7 during the process of the pump head rotating and squeezing the pump pipe. The elastic force of the elastic member 7 causes the pump wheel 3 to generate a certain force on the pump pipe, and the pump wheel 3 squeezes the pump pipe to reach a suitable compression amount. The fastener 8 abutting the outer side of the connecting piece 6 allows the connecting piece to always maintain a pre-tightening state, and it is not easy to loosen and affect the service life of the pump head.

[0031] like Figure 5As shown, the connecting member 6 includes a first connecting portion 601 and a second connecting portion 602, and the whole is a T-shaped structure. The first connecting portion 601 is clamped with the pump wheel bracket 2, and a fastener 8 is abutted on the outside of the second connecting portion 602, and an elastic member 7 is arranged on the outer surface of the fastener 8. In this embodiment, the second connecting portion 602 is inserted from one end of the pump wheel bracket 2, and the pump wheel bracket 2 is clamped in the first connecting portion 601. The outer wall of the second connecting portion 602 is matched and abutted with the inner side of the fastener 8, and the outer side of one end of the fastener 8 is abutted with the pump head body 1. The length of the fastener 8 can determine the initial position of the pump wheel 3 after installation, ensuring the consistency of production; the elastic member 7 is sleeved outside the fastener 8 and is located between the pump wheel bracket 2 and the pump head body 1. The pump wheel bracket 2 can be continuously compressed and rebounded with the rotation and extrusion of the pump pipe. Because the fastener 8 abuts against the connecting member 6, the connecting member 6 always maintains a pre-tightening force and is not easy to loosen, ensuring that the pump wheel 3 does not deviate and is in the correct position. Specifically, the fastener 8 can be integrally formed with the connecting member 6 or with the pump head body 1 to ensure production consistency. The connecting member 6 can be a screw, and the elastic member 7 can be a spring, an elastic pad or other elastic element that can achieve expansion and contraction.

[0032] like Figure 6 , Figure 7 As shown, to prevent the connection shaft 5 from coming out, both ends of the connection shaft 5 are riveted to the pump head body 1, which solves the problem of looseness caused by the threaded connection, ensures the service life of the pump head, and solves the problem of inconvenient assembly by the interference fit. The connection shaft 5 can be a solid shaft or a hollow shaft, preferably a hollow shaft to reduce manufacturing costs.

[0033] In this embodiment, if Fig. 9 As shown, when the pump head rotates, the maximum scanning radius when the outer side of the pump wheel 3 squeezes the pump tube is R1, and the maximum scanning radius of the connecting shaft 5 is R2. Compared with R1, R2 is at least smaller than the radius of the pump tube, thereby avoiding the interference between the connecting shaft 5 and the pump tube to generate sliding friction and wear the pump tube, and there is no need to add rollers to the connecting shaft 5 to convert sliding friction into rolling friction, thereby simplifying the structure and reducing the cost.

[0034] like Figures 3 to 8 As shown, the guide pin 4 is arranged on the left side or / and the right side of the pump wheel 3. Specifically, the guide pin 4 is connected to the pump wheel bracket 2 and is located near the pump wheel 3. The guide pin 4 can be arranged only on the left side or the right side of the pump wheel 3, or on both sides of the pump wheel 3. To meet the requirements of the rotation direction of the pump head, it is preferred to arrange the guide pin 4 on both sides. When the pump tube deviates from the expected position, the guide pin 4 can first guide the pump tube to the correct position, and then the pump wheel 3 squeezes the pump tube to avoid rupture or jamming due to incorrect squeezing after the pump tube deviates.

[0035] like Figures 3 to 8As shown, the guide pin 4 is hemispherical or trumpet-shaped at one end away from the pump wheel bracket 2, and will not pierce the pump tube due to the sharp end. The number of guide pins 4 on one side can be 1 or 2, preferably 2, specifically, one is provided at the top position relative to the pump wheel 3, and one is provided at the bottom position relative to the pump wheel 3. The pump tube passes between the upper and lower guide pins. The guide pins are preferably trumpet-shaped, so that the upper and lower guide pins 4 form an inverted area, and the pump tube is not easily offset when it moves in this area, thereby avoiding rupture due to incorrect squeezing.

[0036] like Figure 4 As shown, in order to make the guide pin 4 rotatable, the guide pin 4 is connected to the pump head body 1 through the guide shaft 9. When the pump head is working, the guide pin 4 can rotate around the guide shaft 9, reducing the sliding friction and wear on the pump tube, and is also more conducive to the introduction of the pump tube.

[0037] like Figure 3 , Figure 4 , Figure 8 As shown, bosses 10 are further provided on both sides of the pump head body 1. The direction shown in the figure is the left and right sides of the pump head body 1. The bosses 10 can be integrally formed with the pump head body 1, and are preferably symmetrically arranged on the left and right sides of the pump head body 1. The bosses 10 can be used to support the pump tube to prevent the pump tube from being suspended in the air. The top plane of the boss 10 is higher than the rotation center of the bottom guide pin 4, further ensuring that the pump tube is in the correct position.

[0038] like Figure 8 As shown, a sensing device 11 is provided at the lower end of the boss 10 for detecting the rotation speed of the pump head and stopping the pump head at a desired position. The number of sensing devices can be set to 1 or 2, and the rotation speed can be adjusted as needed by monitoring the rotation speed of the pump head.

[0039] like Figure 3 , Figure 5 , Figure 6 , Figure 8 As shown, in order to facilitate holding the pump head, a handle 12 is provided on the top of the pump head body 1, and the handle 12 can be further connected with the power shaft of the peristaltic pump to improve the connection stability.

[0040] It should be understood that the embodiments are only used to illustrate the present invention and are not used to limit the scope of the present invention. In addition, it should be understood that after reading the content taught by the present invention, those skilled in the art can make any various changes and modifications to the present invention, and these equivalent forms are also limited by the claims attached to this application.

Claims

1. A peristaltic pump head, comprising a pump head body (1), a pump wheel bracket (2), a pump wheel (3) and a guide pin (4), wherein the pump head body (1) is provided with a pump wheel bracket (2) and a guide pin (4) on both sides, and the pump wheel (3) is rotatably connected to the pump wheel bracket (2); one end of the pump wheel bracket (2) is connected to the pump head body (1) through a connecting shaft (5), and the other end is connected to the pump head body (1) through a connecting piece (6), It is characterized in that The connecting piece (6) is inserted into the mounting holes of the pump head body (1) and the pump wheel bracket (2), a fastener (8) is abutted against the outside of the connecting piece (6), and an elastic piece (7) is disposed on the outer sleeve of the fastener (8).

2. The peristaltic pump head according to claim 1, It is characterized in that The connecting member (6) comprises a first connecting portion (601) and a second connecting portion (602), the first connecting portion is clamped with the pump wheel bracket (2), and the outer side of the second connecting portion (602) abuts against the fastener (8).

3. The peristaltic pump head according to claim 1 or 2, It is characterized in that Both ends of the connecting shaft (5) are riveted to the pump wheel bracket (2).

4. The peristaltic pump head according to claim 3, It is characterized in that The connecting shaft (5) is a hollow shaft.

5. The peristaltic pump head according to claim 1, 2 or 4, It is characterized in that The guide pin (4) is arranged on the left side and / or the right side of the pump wheel (3).

6. The peristaltic pump head according to claim 5, It is characterized in that The end of the guide pin (4) away from the pump wheel bracket (2) is in a hemispherical shape or a trumpet opening shape.

7. The peristaltic pump head according to claim 5, It is characterized in that The guide pin (4) is connected to the pump head body (1) via a guide shaft (9).

8. A peristaltic pump head according to claim 1, 2, 4, 6 or 7, It is characterized in that Bosses (10) are also provided on both sides of the pump head body (1).

9. The peristaltic pump head according to claim 5, It is characterized in that Bosses (10) are also provided on both sides of the pump head body (1).

10. The peristaltic pump head according to claim 8, It is characterized in that A sensing device (11) is provided at the lower end of the boss (10).

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