A peristaltic pump head device for blood purification equipment

Abstract

The present invention discloses a peristaltic pump head device for a blood purification device, comprising: a roller, a driving device for driving the roller to rotate so as to squeeze a soft tube, and an adjusting device. The adjusting device can automatically adjust the distance between the roller and the soft tube according to the force between the roller and the soft tube, and the driving device and the adjusting device are both connected to the roller. When the roller of the device encounters an eccentricity of the inner hole of the soft tube, that is, when the roller reaches different wall thicknesses of the soft tube, under the adjustment action of the adjusting device, the gap distance between the roller and the soft tube can be adjusted according to the force between the roller and the soft tube, thereby effectively solving the gap problem caused by the eccentricity of the inner hole of the soft tube. Therefore, the device can effectively solve the gap problem caused by the eccentricity of the inner hole of the soft tube, and the device has a simple structure and is easy to use, and can be promoted for use.

Description

Technical Field

[0001] The present invention relates to the technical field of peristaltic pumps, and more specifically, to a peristaltic pump head device for blood purification equipment. Background Art

[0002] During blood purification treatment or dialysis treatment, the negative pressure generated by the peristaltic pump is needed to draw blood out of the patient's body. The peristaltic pump alternately squeezes and releases the pump tube to pump the blood. A peristaltic pump is a volumetric pump. Because the transported liquid flows slowly and moves forward in a pulsating manner, just like a crawling animal crawling forward, it is called a peristaltic pump. The peristaltic pump pushes the gas or liquid in the tube forward by squeezing the elastic hose 2; the local vacuum formed when the hose 2 recovers elastically draws the liquid or gas behind. This squeezing process is carried out continuously, and the suction and delivery of liquid or gas is continuously formed, thereby achieving continuous pumping of gas or fluid. Figure 1 The following is a schematic diagram of its principle.

[0003] In the prior art, common peristaltic pump components include a pump head component driven to rotate by a motor and an arc-surface pump chamber. The pump head component is roughly a cylinder or a rotating body, with two or more grooves evenly distributed around it, a corresponding number of roller assemblies are arranged in the grooves, and a compression spring is arranged between the roller assembly and the grooves; its arc-surface pump chamber is an arc-surface pipe baffle plate 11 that can rotate around one end to get close to or away from the pump head component, so that the pipeline can be conveniently installed between the pump head component and the pipe baffle plate 11; the roller assembly is provided with a roller 1, which can squeeze the liquid in the pipeline and pump the liquid when the pump head component rotates.

[0004] Figure 2 This is the working mode of a medical peristaltic pump. The hose 2 is filled with liquid, and two 180° symmetrical rollers 1 squeeze the hose 2. A section of the hose 2 between the rollers 1 forms a "pillow"-shaped fluid. During the rotation of the rollers 1 around the main axis, negative pressure is formed in the tube, and the liquid flows accordingly. For a medical peristaltic pump, if the compression state of the hose 2 cannot be guaranteed, liquid reflux will occur. During the squeezing process, the hose 2 may not be completely closed and leave gaps due to insufficient compression force or eccentricity of the inner hole of the hose 2, which will then cause liquid reflux, affecting the treatment effect and the patient. Figure 3 shown.

[0005] At present, the roller 1 of the peristaltic pump is usually fixed in the following way: ball bearings 13 are placed at the upper and lower ends of the roller 1, a rotating shaft 6 passes through the ball bearing 13 and the retaining ring 12 of the ball bearing 13 in the middle, and the two ends of the rotating shaft 6 are fixed to the upper and lower surfaces of an integral metal part 01, and then the metal part 01 is fixedly connected to the pump head base 3, and a guide shaft 8 and a compression spring 9 are provided between the metal part 01 and the pump head base 3, so that the roller 1 can only rotate around the rotating shaft 6 and move slightly up and down, such as Figure 4 shown.

[0006] Since the gap distance between the roller 1 of the peristaltic pump and the tube baffle 11 for pressing the hose 2 is designed according to the standard hose 2 and is a fixed value, when the motor shaft drives the pump head to rotate, the roller 1 goes from contacting the hose 2 to slowly squeezing the hose 2. Since the hose 2 has a slight eccentricity of the inner hole during the actual processing, the wall thickness of each position of the hose 2 is inconsistent, so that before the roller 1 is squeezed to the preset hose 2 pressing position, the position where the local wall thickness of the hose 2 inner hole is too thick has been closed first, and the remaining position where the wall thickness is too small still has a gap. When the pump head continues to rotate, so that the roller 1 continues to apply squeezing force to the hose 2, the closed part of the inner hole of the hose 2 will generate a reaction force on the roller 1, and then push the metal part 01 of the fixed roller 1 to compress the spring 9, so that the metal part 01 as a whole is close to the pump head base 3 and away from the hose 2. At this time, the closed position of the hose 2 remains closed, and the part with the gap still remains empty.

[0007] In the prior art, some rollers 1 increase the pressing force of the roller 1 on the hose 2 by modifying the shape of the roller 1 or reducing the designed gap between the roller 1 and the tube blocking plate 11, but this is only effective when the inner hole of the hose 2 is concentric. Since the closed part of the hose 2 exerts a reaction force on the roller 1, when the metal part 01 is pushed to compress the spring 9, the roller 1 and the metal part 01 will move as a whole, and the gap of the hose 2 cannot be closed.

[0008] In summary, how to solve the gap problem caused by the eccentricity of the inner hole of the hose is an urgent problem to be solved by those skilled in the art. Summary of the invention

[0009] In view of this, the purpose of the present invention is to provide a peristaltic pump head device for blood purification equipment, which can effectively solve the gap problem caused by the eccentricity of the inner hole of the hose, and the device has a simple structure, is easy to use, and can be promoted for use.

[0010] In order to achieve the above object, the present invention provides the following technical solutions:

[0011] A peristaltic pump head device for a blood purification device comprises: a roller, a driving device for driving the roller to rotate so as to squeeze a hose, and an adjusting device, wherein the adjusting device can automatically adjust the distance between the roller and the hose according to the force conditions between the roller and the hose, and the driving device and the adjusting device are both connected to the roller.

[0012] Preferably, the adjusting device comprises a pump head base arranged parallel to the roller, an upper metal piece arranged at the upper end of the roller, a lower metal piece arranged at the lower end of the roller, a rotating shaft arranged vertically through the upper and lower ends of the roller, and a ball bearing arranged between the rotating shaft and the roller;

[0013] Joint bearings are respectively arranged at both ends of the rotating shaft, and the two joint bearings are respectively arranged in the upper metal component and the lower metal component, and the upper metal component and the lower metal component are both movably connected to the pump head base.

[0014] Preferably, a guide shaft and a compression spring are provided between the upper metal component and the pump head base, and between the lower metal component and the pump head base, and the compression spring is wound around the outer periphery of the guide shaft.

[0015] Preferably, the spherical bearing comprises a bearing outer ring and a spherical bearing embedded in the bearing outer ring, and the end of the rotating shaft is embedded in the spherical bearing.

[0016] Preferably, the inner circumferences of the upper and lower ends of the roller are both provided with bearing retaining rings, and the bearing retaining rings are sleeved on the outer circumference of the rotating shaft.

[0017] Preferably, the adjusting device is a flexible material piece sleeved on the outer periphery of the roller.

[0018] Preferably, the flexible material piece is nano glue or polyurethane.

[0019] Preferably, the flexible material piece is adhered to the outer side of the roller, and the shapes and sizes of the flexible material piece and the roller match each other.

[0020] When using the peristaltic pump head device for blood purification equipment provided by the present invention, the driving device can drive the roller to rotate, and then make the roller contact the hose and then slowly squeeze the hose. Due to the eccentricity of the inner hole of the hose, before the roller reaches the preset hose clamping position, the hose may have partially closed the inner hole, and there may still be gaps in other positions of the hose. The gap caused by the eccentricity of the inner hole may be close to the upper end or lower end of the roller. Assuming that the gap is close to the upper end of the roller, the closed part of the inner hole in the hose is close to the lower end of the roller. When the roller continues to apply a clamping force to squeeze the hose, the closed part of the inner hole will generate a reaction force on the lower end of the roller due to the large internal pressure. At this time, the adjusting device can automatically adjust the distance between the roller and the hose according to the force conditions between the roller and the hose, so that the closed part of the inner hole of the hose reversely squeezes the lower end of the roller to effectively release the reaction force to prevent the reaction force from affecting the upper end of the roller. Furthermore, since there is a gap in the inner hole of the hose corresponding to the upper end of the roller, the gap will not exert a reaction force on the upper end of the roller, so that the upper end of the roller can remain stationary and can continue to exert a clamping force on the gap in the inner hole of the hose. When the roller rotates to the preset hose clamping position, the roller can effectively squeeze and close the gap in the inner hole of the hose.

[0021] Therefore, when the roller of the device encounters an eccentricity of the inner hole of the hose, that is, when the roller reaches different wall thicknesses of the hose, the gap distance between the roller and the hose can be adjusted according to the force between the roller and the hose under the adjustment action of the adjustment device, thereby effectively solving the gap problem caused by the eccentricity of the inner hole of the hose.

[0022] In summary, the peristaltic pump head device for blood purification equipment provided by the present invention can effectively solve the gap problem caused by the eccentricity of the inner hole of the hose, and the device has a simple structure and is easy to use, and can be promoted for use. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the provided drawings without paying creative work.

[0024] Figure 1 It is a schematic diagram of the principle of a peristaltic pump in the prior art;

[0025] Figure 2 It is a schematic diagram of the structure of a medical peristaltic pump in the prior art;

[0026] Figure 3 It is a schematic diagram of the eccentricity of the inner hole of the hose;

[0027] Figure 4 It is a schematic diagram of the structure of a pump head in the prior art;

[0028] Figure 5 This is a schematic diagram of the first structure of the peristaltic pump head device for the blood purification equipment provided by the present invention;

[0029] Figure 6 This is a schematic diagram of the structure of a peristaltic pump head device for a blood purification device when in use;

[0030] Figure 7 A second structural schematic diagram of a peristaltic pump head device for a blood purification device;

[0031] Figure 8 for Figure 7 Cross-section view at AA in the middle.

[0032] Figure 1-Figure 8 middle:

[0033] 01 is a metal part, 1 is a roller, 2 is a hose, 3 is a pump head base, 4 is an upper metal part, 5 is a lower metal part, 6 is a rotating shaft, 7 is a spherical bearing, 8 is a guide shaft, 9 is a compression spring, 10 is a flexible material part, 11 is a tube baffle, 12 is a bearing retaining ring, and 13 is a ball bearing. DETAILED DESCRIPTION

[0034] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0035] The core of the present invention is to provide a peristaltic pump head device for blood purification equipment, which can effectively solve the gap problem caused by the eccentricity of the inner hole of the hose, and the device has a simple structure and is easy to use, and can be promoted for use.

[0036] Please refer to Figures 1 to 8 .

[0037] This specific embodiment provides a peristaltic pump head device for a blood purification device, including: a roller 1, a driving device for driving the roller 1 to rotate so as to squeeze the hose 2, and an adjusting device. The adjusting device can automatically adjust the distance between the roller 1 and the hose 2 according to the force conditions between the roller 1 and the hose 2. The driving device and the adjusting device are both connected to the roller 1.

[0038] It should be noted that when using a peristaltic pump to transport liquid, in order to solve the liquid reflux phenomenon caused by the gap caused by the eccentric inner hole of the hose 2, the most fundamental solution is to adjust the different gap distances between the roller 1 and the tube baffle 11 at different wall thicknesses of the hose 2, that is, the end of the hose 2 with a thicker wall requires a larger gap distance, and the end of the hose 2 with a thinner wall requires a smaller gap distance. This is because the inner hole at the end of the hose 2 with a thicker wall will be partially closed, and the internal pressure of the partially closed part is relatively large, which will generate a reaction force on the lower end of the roller 1, that is, the partially closed part will squeeze the roller 1, so that the gap distance between the roller 1 and the tube baffle 11 becomes larger. A gap is still left at the end of the hose 2 with a smaller wall thickness, and the gap will not generate a reaction force on the lower end of the roller 1, so that the gap distance between the roller 1 and the tube baffle 11 is relatively small. Therefore, the roller 1 can continue to apply a clamping force to the gap in the inner hole of the hose 2. When the roller 1 is rotated to the preset hose 2 clamping position, the roller 1 can squeeze and close the gap in the inner hole of the hose 2.

[0039] In actual use, the shape, structure, size, position, material, etc. of the roller 1, the driving device and the adjusting device can be determined according to actual conditions and actual needs.

[0040] When using the peristaltic pump head device for blood purification equipment provided by the present invention, the driving device can drive the roller 1 to rotate, and then make the roller 1 contact the hose 2 and then slowly squeeze the hose 2. Due to the eccentricity of the inner hole of the hose 2, before the roller 1 reaches the preset hose 2 compression position, the hose 2 may have partially closed the inner hole, and there may still be gaps at other positions of the hose 2. The gap caused by the eccentricity of the inner hole may be close to the upper end or lower end of the roller 1. Assuming that the gap is close to the upper end of the roller 1, the closed part of the inner hole in the hose 2 is close to the lower end of the roller 1. When the roller 1 continues to apply a compression force to squeeze the hose 2, the closed part of the inner hole will generate a reaction force on the lower end of the roller 1 due to the large internal pressure. At this time, the adjustment device can automatically adjust the distance between the roller 1 and the hose 2 according to the force conditions between the roller 1 and the hose 2, so that the closed part of the inner hole of the hose 2 reversely squeezes the lower end of the roller 1 to effectively release the reaction force to prevent the reaction force from affecting the upper end of the roller 1. Furthermore, since there is a gap in the inner hole of the hose 2 corresponding to the upper end of the roller 1, the gap will not exert a reaction force on the upper end of the roller 1, so that the upper end of the roller 1 can remain stationary and can continue to exert a clamping force on the gap in the inner hole of the hose 2. When the roller 1 rotates to the preset clamping position of the hose 2, the roller 1 can effectively squeeze and close the gap in the inner hole of the hose 2.

[0041] Therefore, when the roller 1 of the device encounters an eccentricity of the inner hole of the hose 2, that is, when the roller 1 reaches different wall thicknesses of the hose 2, the gap distance between the roller 1 and the hose 2 can be adjusted according to the force between the roller 1 and the hose 2 under the adjustment of the adjustment device, thereby effectively solving the gap problem caused by the eccentricity of the inner hole of the hose 2.

[0042] In summary, the peristaltic pump head device for blood purification equipment provided by the present invention can effectively solve the gap problem caused by the eccentricity of the inner hole of the hose 2, and the device has a simple structure and is easy to use, and can be promoted for use.

[0043] On the basis of the above embodiment, preferably, the adjusting device includes a pump head base 3 arranged parallel to the roller 1, an upper metal part 4 arranged at the upper end of the roller 1, a lower metal part 5 arranged at the lower end of the roller 1, a rotating shaft 6 arranged vertically through the upper and lower ends of the roller 1, and a ball bearing 13 arranged between the rotating shaft 6 and the roller 1; joint bearings 7 are respectively provided at both ends of the rotating shaft 6, and the two joint bearings 7 are respectively arranged in the upper metal part 4 and the lower metal part 5, and the upper metal part 4 and the lower metal part 5 are both movably connected to the pump head base 3, such as Figure 5 shown.

[0044] It should be noted that the connection between the roller 1 and the driving device for rotation means that the pump head as a whole is rotated by the motor, and when the pump head rotates, the friction force generated by the contact between the roller 1 and the pump tube causes the roller 1 to rotate around the rotating shaft 6. The specific process of the roller 1 rotating around the rotating shaft 6 is as follows: the rotating shaft 6 is tightly matched with the inner ring of the ball bearing 13 inside the roller 1 (the two do not rotate relative to each other), the outer ring of the ball bearing 13 is transitionally matched with the roller 1 (the two do not rotate relative to each other), and finally the rotating shaft 6 is stationary throughout the whole process, while the outer ring of the ball bearing 13 drives the roller 1 to rotate relative to the inner ring of the ball bearing 13, and the ball bearing 13 can effectively reduce the rotational friction of the roller 1.

[0045] In addition, it should be noted that when the roller 1 encounters an eccentric inner hole of the hose 2, the force conditions at the upper and lower ends of the roller 1 are different, resulting in different movement amounts between the upper metal part 4 and the pump head base 3, and between the lower metal part 5 and the pump head base 3, causing the roller 1 to "swing". That is, when the roller 1 reaches different wall thicknesses, the gap distance between the roller 1 and the tube baffle plate 11 can be adjusted according to different force conditions, thereby effectively solving the gap problem caused by the eccentric inner hole of the hose 2.

[0046] Preferably, a guide shaft 8 and a compression spring 9 are provided between the upper metal component 4 and the pump head base 3 , and between the lower metal component 5 and the pump head base 3 , and the compression spring 9 is wound around the outer periphery of the guide shaft 8 .

[0047] It should be noted that a guide shaft 8 is vertically arranged between the upper metal part 4 and the pump head base 3, and between the lower metal part 5 and the pump head base 3. A compression spring 9 is wound around the outer periphery of the guide shaft 8. When the inner hole of the hose 2 is eccentric, if the gap caused by the eccentricity of the inner hole is close to the upper end of the roller 1, when the roller 1 continues to rotate and applies an extrusion force to the hose 2, the closed part of the inner hole of the hose 2 will be close to the lower end of the roller 1, and a reaction force will be generated on the roller 1, squeezing and pushing the roller 1 close to the pump head base 3. Since both ends of the rotating shaft 6 A joint bearing 7 is provided, and the rotating shaft 6 can swing in the joint bearing 7 according to the force applied to the roller 1. At this time, the lower end of the roller 1 will approach the pump head base 3 under the driving force of the reaction force, and then the lower end of the rotating shaft 6 will swing toward the pump head base 3, and the lower metal part 5 will effectively squeeze the compression spring 9. The upper metal part 4 remains stationary due to the gap in the inner hole of the hose 2, so that the roller 1 can continue to apply a clamping force to the gap in the inner hole until the roller 1 turns to the preset clamping position of the hose 2, and the inner hole gap is closed. If the gap caused by the eccentricity of the inner hole is close to the lower end of the roller 1, the operating principle is similar and will not be repeated here.

[0048] Preferably, the joint bearing 7 includes a bearing outer ring and a spherical bearing embedded in the bearing outer ring, and the end of the rotating shaft 6 is embedded in the spherical bearing. The spherical bearing can swing in the bearing outer ring. Therefore, when the roller 1 is pushed by the reaction force, the rotating shaft 6 will swing in the joint bearing 7 to adjust the interval between the roller 1 and the hose 2 in real time according to the force situation, that is, to adjust the interval between the roller 1 and the tube blocking plate 11.

[0049] Preferably, the inner circumference of the upper and lower ends of the roller 1 is provided with a bearing retaining ring 12, and the bearing retaining ring 12 is sleeved on the outer circumference of the rotating shaft 6. The bearing retaining ring 12 is beneficial to the service life of the ball bearing 13, thereby improving the rotation effect of the rotating shaft 6 and the roller 1, and improving the overall service life of the device.

[0050] Next, the specific operation process of the device is introduced. When the driving device drives the roller 1 to rotate, the roller 1 starts to contact the hose 2 and then slowly squeezes the hose 2. Due to the eccentricity of the inner hole of the hose 2, that is, the wall thickness of the hose 2 is different at different places, before the roller 1 rotates to the preset hose 2 compression position, the hose 2 has already partially closed and has local gaps.

[0051] Assuming that the gap caused by the eccentricity of the inner hole appears near the upper end of the roller 1, when the roller 1 continues to rotate to squeeze the hose 2, the partially closed part of the inner hole of the hose 2 is close to the lower end of the roller 1, and the partially closed part will generate a reaction force on the roller 1 to push the lower end of the roller 1. Since joint bearings 7 are provided at both ends of the rotating shaft 6, the rotating shaft 6 can swing with the inner ring of the joint bearing 7, and the outer ring of the joint bearing 7 remains horizontal. At this time, the lower metal part 5 at the lower end of the roller 1 can squeeze the corresponding compression spring 9, and the upper metal part 4 at the upper end of the roller 1 remains stationary due to the gap in the inner hole of the hose 2. The upper end of the roller 1 can continue to apply a clamping force to the gap in the inner hole. When the roller 1 rotates to the preset hose 2 clamping position, the inner hole gap can be closed. Figure 6 shown.

[0052] It should be noted that if the gap in the inner hole of the hose 2 appears near the lower end of the roller 1, the partially closed part of the inner hole of the hose 2 is close to the upper end of the roller 1. The partially closed part will generate a reaction force on the roller 1, pushing the upper end of the roller 1, and then causing the upper metal part 4 at the upper end of the roller 1 to squeeze the corresponding compression spring 9, while the lower metal part 5 at the lower end of the roller 1 remains unchanged, and the lower end of the roller 1 can continue to apply a clamping force to the gap in the inner hole of the hose 2 until the roller 1 rotates to the preset clamping position of the hose 2 and performs a closing and clamping operation on the gap in the inner hole of the hose 2.

[0053] In actual use, the shape, structure, size, position, material, etc. of the pump head base 3, upper metal part 4, lower metal part 5, ball bearing 13, bearing retaining ring 12, guide shaft 8, compression spring 9 and joint bearing 7 can be determined according to actual conditions and actual needs.

[0054] On the basis of the above embodiment, preferably, the adjusting device is a flexible material piece 10 sleeved on the outer periphery of the roller 1 .

[0055] It should be noted that, in the process of the roller 1 squeezing the hose 2, due to the eccentricity of the inner hole of the hose 2, that is, the wall thickness of the hose 2 is different at various places, before the roller 1 rotates to the preset hose 2 pressing position, the hose 2 will have partial closure and partial gap phenomenon. Since the outer periphery of the roller 1 is provided with a flexible material piece 10 of a certain thickness, after the end of the hose 2 with a larger wall thickness has a partial closure phenomenon, the partial closure part will first sink into the flexible material piece 10, and the end of the hose 2 with a smaller wall thickness will stick to the surface of the flexible material piece 10 or then sink into the flexible material piece 10, so that the local gap of the end with a smaller wall thickness is also closed. By utilizing the elasticity of the flexible material piece 10, at different wall thicknesses of the hose 2, local elastic deformation is generated according to the force between the roller 1 and the hose 2, and then the gap between the roller 1 and the hose 2 is adjusted, and the gap distance between the roller 1 and the tube blocking plate 11 is adjusted, so as to ensure that under the adjustment of the flexible material piece 10, the hose 2 can be pressed to the preset position at various places by the roller 1, and finally the inner hole of the hose 2 is completely closed.

[0056] Preferably, the flexible material piece 10 is nano glue or polyurethane.

[0057] Preferably, the flexible material piece 10 is attached to the outer side of the roller 1, so as to facilitate the assembly of the flexible material piece 10 and the roller 1. The shapes and sizes of the flexible material piece 10 and the roller 1 are matched, which can effectively ensure that the flexible material piece 10 is in contact with the hose 2 when the roller 1 rotates, and avoid the waste of materials caused by setting the flexible material piece 10 too large.

[0058] In actual use, the shape, size, structure, etc. of the flexible material piece 10 can be determined according to actual conditions and actual needs.

[0059] In addition, it should be noted that the orientations or positional relationships indicated by "up and down", "inside and outside", "parallel", "vertical", etc. in this application are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of simplifying the description and facilitating understanding, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0060] In this specification, each embodiment is described in a progressive manner, and each embodiment focuses on the differences from other embodiments. The same or similar parts between the embodiments can be referred to each other. Any combination of all embodiments provided by the present invention is within the protection scope of this invention and will not be described in detail here.

[0061] The peristaltic pump head device for the blood purification equipment provided by the present invention is introduced in detail above. Specific examples are used in this article to illustrate the principles and implementation methods of the present invention. The description of the above embodiments is only used to help understand the method of the present invention and its core idea. It should be pointed out that for ordinary technicians in this technical field, without departing from the principle of the present invention, several improvements and modifications can be made to the present invention, and these improvements and modifications also fall within the scope of protection of the claims of the present invention.

Claims

1. A peristaltic pump head device for a blood purification device, characterized in that: include: A roller (1), a driving device for driving the roller (1) to rotate so as to squeeze the hose (2), and an adjusting device, wherein the adjusting device can automatically adjust the distance between the roller (1) and the hose (2) according to the force applied between the roller (1) and the hose (2), and the driving device and the adjusting device are both connected to the roller (1); The regulating device comprises a pump head base (3) arranged parallel to the roller (1), an upper metal part (4) arranged at the upper end of the roller (1), a lower metal part (5) arranged at the lower end of the roller (1), a rotating shaft (6) arranged vertically through the upper and lower ends of the roller (1), and a ball bearing (13) arranged between the rotating shaft (6) and the roller (1); Joint bearings (7) are respectively provided at both ends of the rotating shaft (6), and the two joint bearings (7) are respectively provided in the upper metal component (4) and the lower metal component (5), and the upper metal component (4) and the lower metal component (5) are both movably connected to the pump head base (3); A guide shaft (8) and a compression spring (9) are provided between the upper metal part (4) and the pump head base (3), and between the lower metal part (5) and the pump head base (3); the compression spring (9) is wound around the outer periphery of the guide shaft (8).

2. The peristaltic pump head device for blood purification equipment according to claim 1, characterized in that: The spherical bearing (7) comprises a bearing outer ring and a spherical bearing embedded in the bearing outer ring, and the end of the rotating shaft (6) is embedded in the spherical bearing.

3. The peristaltic pump head device for blood purification equipment according to claim 2, characterized in that: The inner circumference of the upper and lower ends of the roller (1) are both provided with bearing retaining rings (12), and the bearing retaining rings (12) are sleeved on the outer circumference of the rotating shaft (6).

4. The peristaltic pump head device for blood purification equipment according to claim 1, characterized in that: The adjusting device comprises a flexible material piece (10) sleeved on the outer periphery of the roller (1).

5. The peristaltic pump head device for blood purification equipment according to claim 4, characterized in that: The flexible material piece (10) is nano glue or polyurethane.

6. The peristaltic pump head device for blood purification equipment according to claim 5, characterized in that: The flexible material piece (10) is adhered to the outer side of the roller (1), and the shape and size of the flexible material piece (10) and the roller (1) match.

Images