Peristaltic pump head and peristaltic pump

Abstract

The utility model discloses a peristaltic pump head which comprises a pump head body, roller supports and rollers, the two roller supports are symmetrically arranged on the outer side of the pump head body in the circumferential direction and can synchronously rotate along with the pump head body, and the rollers are rotationally connected to the roller supports respectively. The roller comprises a conical section and a cylindrical section which are continuously arranged from outside to inside, the width of the conical section is gradually increased from outside to inside, and when the pump head body drives the roller support to rotate, the roller extrudes the pump pipe so as to convey fluid in the pump pipe. According to the pump head of the peristaltic pump, the end, close to the outer side of the pump head of the peristaltic pump, of the idler wheel is arranged to be the conical section, the conical surface formed by the conical section plays a role in guiding the pump pipe to be gradually folded, resistance generated when the pump pipe is just sleeved is reduced, and therefore liquid conveying efficiency is improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to medical instrument technical field especially, relates to a peristaltic pump pump head and peristaltic pump. BACKGROUND

[0002] In the field of biomedical engineering and fluid mechanics, hemodialysis device is an important medical equipment for helping patients with renal failure to purify blood. In the hemodialysis device, peristaltic pump is a key component, which mainly functions to extrude the hose to realize the delivery of liquid.

[0003] The peristaltic pump is usually composed of a pump head and a pump shell, the pump head is connected with a motor assembly through a transmission shaft, the motor assembly drives the pump head to rotate, and a set or multiple sets of circumferentially distributed rollers are installed on the pump head. When working, the pump pipe is sleeved on the outer periphery of the rollers, and the rollers extrude the pump pipe in turn during the rotation of the pump head, so that the medium in the pump pipe flows. The cross section of the existing roller is usually cylindrical. Although this design can reduce the wear of the pump pipe, it cannot effectively improve the guiding effect of the pump pipe, resulting in low liquid delivery efficiency. Therefore, how to design a new type of peristaltic pump to improve the guiding effect of the pump pipe and improve the liquid delivery efficiency is a problem to be solved in the current field. SUMMARY

[0004] In order to solve the above problems existing in the prior art, the purpose of the utility model is to provide a peristaltic pump pump head and peristaltic pump, which can help the pump pipe to be put on the pipe faster and more accurately, so as to improve the guiding effect of the pump pipe and improve the liquid delivery efficiency.

[0005] In order to solve the above technical problems, the utility model adopts the following technical scheme: a peristaltic pump pump head, comprising:

[0006] A pump head body;

[0007] A roller support is arranged symmetrically on the outer side of the pump head body and can rotate synchronously with the pump head body;

[0008] Rollers are respectively connected to the roller supports, the rollers comprise a tapered section and a cylindrical section arranged continuously from outside to inside, and the width of the tapered section gradually increases from outside to inside;

[0009] When the pump head body drives the roller support to rotate, the rollers extrude the pump pipe to deliver the fluid in the pump pipe.

[0010] As a further improvement of the utility model, the taper angle of the tapered section is 3-7°.

[0011] As a further improvement of the utility model, a shell is connected to the outer side of the pump head body, and a guiding protrusion is arranged on the edge of the shell.

[0012] As a further improvement of the utility model, the cross section of the guide protrusion is rectangular.

[0013] As a further improvement of the utility model, a spring is further connected between the pump head main body and the roller support, so that one end of the roller support can move radially relative to the pump head main body.

[0014] As a further improvement of the utility model, the spring comprises a bolt, a spring sleeved on the bolt, and a fastener for fixing the bolt, an outer wall of one end of the roller support connected with the bolt is provided with an accommodating groove for accommodating the head of the bolt, the pump head main body is circumferentially provided with a recessed portion recessed inward, a screw rod of the bolt extends into the cavity of the pump head main body after sequentially penetrating the accommodating groove and the recessed portion, and the fastener abuts against the screw rod of the bolt after penetrating the pump head main body.

[0015] As a further improvement of the utility model, one end of the pump head main body away from the recessed portion is provided with a hinged seat, a pin shaft is arranged on the hinged seat, and the roller support is rotationally connected with the pin shaft.

[0016] As a further improvement of the utility model, the pump head main body is provided with a limiting boss matched with the pump pipe on the axially opposite sides.

[0017] A peristaltic pump comprises a peristaltic pump head;

[0018] A pump seat is provided with a pump groove for rotating the peristaltic pump head, and a pump pipe installation channel is formed between the support surface of the pump groove and the peristaltic pump head.

[0019] A driving mechanism is connected with the pump head main body and can drive the pump head main body to rotate to extrude the pump pipe.

[0020] As a further improvement of the utility model, a pump head locking column rotatable relative to the shell is arranged at the central position of the shell, and the end of the pump head locking column is connected with the driving mechanism after sequentially penetrating the shell and the roller support.

[0021] Compared with the prior art, the utility model has the following beneficial effects:

[0022] 1. The peristaltic pump head of the utility model is provided with a tapered section at one end of the roller close to the outer side of the peristaltic pump head, the tapered surface formed by the tapered section plays a guiding role of gradually folding the pump pipe, the resistance when the pump pipe is initially sleeved is reduced, and the liquid conveying efficiency is improved.

[0023] 2.The peristaltic pump head of the utility model, through setting up the guide convex point with the cross section of rectangle on the pump shell, can provide a relatively stable support plane for the pump pipe, make it can be guided steadily along the predetermined direction, thereby reduce the possibility of pump pipe deviation. BRIEF DESCRIPTION OF DRAWINGS

[0024] Figure 1 It is the whole structure schematic diagram of the peristaltic pump head of the utility model;

[0025] Figure 2 It is the side view structure schematic diagram of the peristaltic pump head of the utility model;

[0026] Figure 3 It is the elastic piece structure schematic diagram of the utility model;

[0027] Figure 4 It is the roller structure schematic diagram of the utility model;

[0028] Figure 5 It is the roller support structure schematic diagram of the utility model;

[0029] Figure 6 It is the peristaltic pump head, pump pipe and pump seat assembly schematic diagram of the utility model;

[0030] Figure 7 It is the peristaltic pump structure schematic diagram of the utility model;

[0031] Figure 8 It is the pump head locking column and shell assembly schematic diagram of the utility model. DETAILED DESCRIPTION

[0032] The technical solutions in the embodiments of the utility model will be clearly and completely described below with reference to the drawings in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by those skilled in the art without creative labor fall within the protection scope of the utility model.

[0033] Figures 1 to 5 The structure schematic diagram of one embodiment of the peristaltic pump head of the utility model is shown, and the main part includes the pump head main body 100, the roller support 200 and the roller 300.

[0034] The pump head body 100 is equivalent to the rotor of the peristaltic pump, and under the driving of the driving mechanism 600, the roller 300 is rotated to extrude the pump tube A to transport the fluid in the pump tube A. The end of the pump head body 100 away from the recess 130 is provided with a hinged seat 140, and a pin shaft 150 is arranged on the hinged seat 140, and the roller support 200 is rotationally connected with the pin shaft 150. As preferred, in the embodiment, the two axially opposite sides of the pump head body 100 are provided with limiting bosses 160 matched with the pump tube A, and the pump tube A is located in the oppositely arranged limiting bosses 160, so that the pump tube A can be prevented from being deviated during the operation of the peristaltic pump.

[0035] The roller support 200 is arranged symmetrically in the circumferential direction on the outside of the pump head body 100 and can rotate synchronously with the pump head body 100. In the embodiment, the roller support 200 is arranged in two and symmetrically arranged along the axial direction of the pump head body 100.

[0036] The roller 300 is used to extrude the pump tube A to transport the fluid in the pump tube A, and the roller 300 is rotationally connected to the roller support 200 respectively, and the alternating extrusion of the roller 300 to the pump tube A is realized when the roller support 200 rotates. The roller 300 is rotatably mounted on the roller support 200 through a roller shaft, so that the roller 300 can rotate in addition to rotating with the roller support 200, so as to reduce the friction between the roller 300 and the pump tube A. The roller 300 is made of a medical-grade engineering material with high strength, high wear resistance and excellent biocompatibility, such as PEEK. In the embodiment, the roller 300 includes a tapered section 310 and a cylindrical section 320 arranged successively from outside to inside, and the width of the tapered section 310 gradually increases from outside to inside and gradually transitions to the width of the cylindrical section 320. When the pump head body 100 drives the roller support 200 to rotate, the roller 300 extrudes the pump tube A to transport the fluid in the pump tube A. When the pump tube A is sleeved on the roller 300, the tapered section 310 on the outside of the roller 300 is like a guide slope, and since the width of the tapered section 310 gradually increases from outside to inside, the tapered surface formed thereby can play a guiding role of gradually gathering the pump tube A. Compared with the traditional cylindrical roller, the tapered section 310 reduces the friction, i.e. reduces the resistance when the pump tube A is initially sleeved, and the pump tube is easier to find the correct position when sleeved, helping the pump tube to be sleeved faster and more accurately.

[0037] As preferred, in the present embodiment, in order to ensure that the pump tube A is guided in the right position while avoiding damage to the pump tube A due to excessive force, the taper angle of the tapered section 310 (the angle between the outer end of the tapered end 310 and the central axis of the roller 300) is set to 3-7°, further preferably 4-6°. The taper angle is directly related to the guiding effect on the pump tube A. If the taper angle is too large, although a larger axial guiding force can be generated, it can cause the pump tube A to be subjected to excessive radial force during the fitting and running process, which can cause excessive deformation of the pump tube A, or even damage the pump tube. On the contrary, if the taper angle is too small, the guiding effect is not obvious, and the pump tube A cannot be effectively guided into the correct position, so it is difficult to achieve the purpose of improving the liquid delivery efficiency.

[0038] As preferred, in the present embodiment, in order to ensure that the pump tube A can smoothly transition from the guided state to the stable delivery state during the entire running process, and optimize the liquid delivery efficiency, the ratio of the length of the tapered section 310 in the axial direction to the length of the cylindrical section 320 in the axial direction is set to 4:12-7:12, further preferably 5.8:12-6.8:12. Such a ratio can further ensure that during the fitting stage of the pump tube A, there is a sufficient length of the tapered section 310 to effectively guide the pump tube A to accurately enter the working position. In addition, during the subsequent liquid delivery process, the relatively proportional cylindrical section 320 can provide sufficient stable extrusion force to ensure that the liquid flows stably and efficiently in the pump tube, meeting the working requirements of the peristaltic pump.

[0039] As preferred, in the present embodiment, the outer side of the pump head body 100 is connected with a shell 110, and the edge of the shell 110 is outwardly provided with a guiding protrusion 120. Specifically, the cross section of the guiding protrusion 120 is rectangular, which provides a relatively stable support plane for the pump tube, so that it can be smoothly guided along the predetermined direction. The bevel angle of the triangular guiding protrusion of the prior art can cause a diagonal force on the pump tube during the guiding process. If this diagonal force is too large, it is easy to make the pump tube deviate from the normal guiding path, or even slip out of the guiding protrusion (which can easily cause the pump tube to be scratched during the guiding process). The right angle design of the rectangular cross section of the guiding protrusion 120 in the present embodiment can better constrain the movement direction of the pump tube on the desired path, reducing the possibility of deviation of the pump tube. At the same time, the right angle edge of the rectangle is relatively blunt, and during the contact with the pump tube, the pump tube is mainly guided by the friction force of the plane, reducing the damage to the surface of the pump tube.

[0040] As preferred, in the present embodiment, a spring 400 is further connected between the pump head body 100 and the roller support 200, so that one end of the roller support 200 can move radially relative to the pump head body 100. The one end of the roller support 200 is connected to the pump head body 100 through the spring 400, and the other end is hinged to the pump head body 100 through the pin shaft 150. Specifically, the spring 400 includes a bolt 410, a spring 420 sleeved on the bolt 410, and a fastener 430 for fixing the bolt. The outer wall of the one end of the roller support 200 connected to the bolt 410 is provided with a receiving groove for accommodating the head of the bolt 410, the pump head body 100 is provided with a recess 130 recessed inward in the circumferential direction, and the shank of the bolt 410 extends into the cavity of the pump head body 100 after sequentially penetrating the receiving groove and the recess 130, and the fastener 430 abuts against the shank of the bolt 410 after penetrating the pump head body 100. The fastener 430 always maintains a pre-tightening force and is not easy to loosen, thereby ensuring that the roller 300 does not deviate. In the present embodiment, a certain gap is reserved between the roller support 200 and the pump head body 100. During the rotation of the pump head body 100, the roller support 200 is constantly compressed and released by the spring 420 during the rotation of the roller 300 to extrude the pump tube A. The spring 420 enables the roller 300 to generate a certain force on the pump tube A, and the roller 300 extrudes the pump tube A to a proper compression amount. When the roller 300 extrudes the pump tube A, the one end of the roller support 200 moves towards the pump head body 100, and the spring 420 is compressed. When the roller 300 releases the pump tube A, the one end of the roller support 200 moves away from the pump head body 100, and the spring 420 is released.

[0041] As Figure 6 , Figure 7 shown, the utility model also protects a peristaltic pump, be applied to blood pump or other liquid pump use on equipment such as continuous blood purification equipment, hemodialysis machine. The peristaltic pump of the utility model includes peristaltic pump pump head, pump seat 500 and drive mechanism 600.

[0042] Pump groove 510 for peristaltic pump head rotation is arranged on pump seat 500, and pump tube installation passage 520 is formed between the support surface of pump groove 510 and peristaltic pump head. In the present embodiment, the pump groove 510 is C-shaped, and the outlet pipe and inlet pipe of the pump tube A are placed at the gap of the pump groove 510. A cover is arranged on the outer side of the pump groove 510, and one end of the cover is hinged to the pump seat 500 and can be opened or closed relative to the groove 510.

[0043] The driving mechanism 600 is connected with the pump head main body 100, and can drive the pump head main body 100 to rotate to extrude the pump pipe A. In the embodiment, the driving mechanism 600 is a stepping motor, and an output shaft of the stepping motor penetrates the pump base 500 and extends into the pump head main body 100 to be connected with the pump head main body 100, so that the pump head main body 100 is driven to rotate synchronously with the roller support 200, so that the roller 300 on the roller support 200 extrudes the fluid in the pump pipe A.

[0044] As shown in Figure 8 the embodiment, in order to cope with sudden power failure, equipment failure and other emergency situations, avoid blood coagulation and other dangerous situations caused by long-term stay of blood in the extracorporeal pipeline, or in the use scenarios of waste liquid pump, dialysis liquid pump, replacement liquid pump and citric acid pump, the flow, speed, composition or dose of the liquid is controlled for emergency treatment, such as pipeline blockage, abnormal flow, liquid imbalance or anticoagulation problem. A pump head locking column 170 rotatable relative to the shell 110 is arranged at the center position of the shell 110, the pump head locking column 170 is provided with a locking groove, and the end of the pump head locking column 170 penetrates the shell 110 and the roller support 200 in sequence and is connected with the output shaft of the stepping motor. By inserting a wrench of an external device into the locking groove, the pump head locking column 170 is manually rotated, so that the peristaltic pump head is driven to rotate.

[0045] In combination Figures 6 to 7 , the peristaltic pump of the embodiment is used as follows:

[0046] First, the pipe support is clamped to the pump base 500, and the pump pipe A integrated with the pipe support is also clamped to the panel of the device host. At this time, the pump pipe A at the position corresponding to the pump groove 510 is placed outside the peristaltic pump head, the initial position of the guide protrusion 120 corresponds to the opening direction of the pump groove 510, and then the device is started to control the movement of the driving mechanism 600, so that the peristaltic pump head is driven to rotate in the pump groove 510, and the guide protrusion 120 guides the pump pipe A to the conical section 310 of the roller 300. The peristaltic pump head continues to rotate, the pump pipe A is guided to the cylindrical section 320 of the roller 300, and the roller 300 successively extrudes the pump pipe A to make the medium in the pump pipe A flow.

[0047] Although the embodiments of the utility model have been shown and described, it can be understood by those skilled in the art that various changes, modifications, replacements and variations can be made to the embodiments without departing from the principles and spirits of the utility model, and the scope of the utility model is defined by the appended claims and their equivalents.

Claims

1. A peristaltic pump head characterized by, The utility model relates to a peristaltic pump head, comprising: a pump head body (100); a roller support (200) arranged symmetrically on the outer side of the pump head body (100) and capable of rotating synchronously with the pump head body (100); a roller (300) rotatably connected to the roller support (200), wherein the roller (300) comprises a tapered section (310) and a cylindrical section (320) arranged successively from outside to inside, and the width of the tapered section (310) gradually increases from outside to inside; when the pump head body (100) drives the roller support (200) to rotate, the roller (300) extrudes the pump tube (A) to deliver the fluid in the pump tube (A).

2. A peristaltic pump head as claimed in claim 1, wherein: The taper angle of the tapered section (310) is 3-7°.

3. A peristaltic pump head as claimed in claim 1, wherein: The outer side of the pump head body (100) is connected with a shell (110), and the edge of the shell (110) is outwardly provided with a guide protrusion (120).

4. A peristaltic pump head as claimed in claim 3, wherein: The cross section of the guide protrusion (120) is rectangular.

5. A peristaltic pump head according to any one of claims 1 to 4, wherein: The pump head body (100) and the roller support (200) are further connected with an elastic member (400), so that one end of the roller support (200) can move radially relative to the pump head body (100).

6. A peristaltic pump head as claimed in claim 5, wherein: The elastic member (400) comprises a bolt (410), a spring (420) sleeved on the bolt (410), and a fastener (430) for fixing the bolt, and the outer wall of one end of the roller support (200) connected with the bolt (410) is provided with a containing groove for containing the head of the bolt (410), the pump head body (100) is symmetrically provided with a recess (130) recessed inward, and the screw rod of the bolt (410) extends into the cavity of the pump head body (100) after sequentially penetrating the containing groove and the recess (130), and the fastener (430) abuts against the screw rod of the bolt (410) after penetrating the pump head body (100).

7. A peristaltic pump head as claimed in claim 6, wherein: The end of the pump head body (100) away from the recess (130) is provided with a hinged seat (140), the hinged seat (140) is provided with a pin shaft (150), and the roller support (200) is rotatably connected with the pin shaft (150).

8. A peristaltic pump head as claimed in claim 1, wherein: The axially opposite sides of the pump head body (100) are provided with limiting bosses (160) matched with the pump tube (A).

9. A peristaltic pump characterized by, The utility model relates to a peristaltic pump head comprising any one of claims 1-8; a pump seat (500) provided with a pump groove (510) for the rotation of the peristaltic pump head, wherein the support surface of the pump groove (510) and the peristaltic pump head have a pump tube installation channel (520); a driving mechanism (600) connected with the pump head body (100) and capable of driving the pump head body (100) to rotate to extrude the pump tube (A).

10. A peristaltic pump according to claim 9, wherein: The central position of the shell (110) is provided with a pump head locking column (170) rotatable relative to the shell (110), and the end of the pump head locking column (170) is sequentially connected with the driving mechanism (600) after penetrating the shell (110) and the roller support (200).

Images