Hose roller pump
By introducing sliding edges into the peristaltic pump, the problem of hose segment stuck in the unfavorable rotating position of the rotor is solved, and a larger angle window and a softer outflow process is achieved, reducing the damage to the hose segment risk.
Patent Information
- Application Number
- CN202410719329.7
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Priority Date
- 2023-06-07
- Filing Date
- 2024-06-05
- Publication Date
- 2024-12-10
AI Technical Summary
Existing peristaltic pumps are prone to cause hose segments to get stuck when the rotor occupies an unfavorable rotational position, and a limited angle window of less than 90° is required during operation, increasing the risk of hose segments.
The peristaltic pump introduces a sliding edge opposite to the rotor's rotation direction, which is connected to the rotor in a relative rotation manner, allowing the hose segment to cause rotation of the rotor under a small tension, thereby preventing the hose segment from being stuck. And a soft pass-through process is achieved by reducing tension and friction.
Through the design of sliding edges, the allowable angle window of the rotor when manually passing out is expanded, reducing the probability of hose segments being stuck, simplifying the throughput process, and reducing the risk of damage to the hose segments.
Smart Images
Figure CN119103089A_ABST
Abstract
Description
Technical Field
[0001] The invention relates to a hose roller pump or peristaltic pump, i.e. a volumetric pump, in which the medium to be conveyed is squeezed through the hose by external mechanical deformation of the hose. Such pumps are usually used in devices for extracorporeal blood treatment, in particular dialysis machines, for conveying fluids, in particular blood. The fluid is conveyed from the low-pressure side to the high-pressure side by means of a peristaltic pump, wherein an elastically deformable fluid line in the form of a hose segment (the hose segment is also referred to as a pump segment) arranged between the low-pressure side and the high-pressure side is deformed, in particular squeezed, by means of at least two squeezing elements between a support surface of a pump bed and a rotor rotating relative to the support surface. Background Art
[0002] In known peristaltic pumps, such as those known from EP 1 749 549 B1 and as described in Figures 8 to 11 As schematically shown in FIG. 1 , two diametrically offset pressing elements 320 in the form of elastically supported pressure rollers are provided on the rotor 310 , and the support surface 330 is formed by a circular arc surface which extends over a sufficiently large central angle WZS of more than 180°.
[0003] For additional fixing of the hose section 340 inserted into the peristaltic pump, ie into the pump bed (see Fig.11 ), there is a guide surface 350 in the shape of a circular arc at the center between the two pressure rollers 320, which is at a center angle WZF of about 30° (see Fig.10 ). The rotor 310 carries a pair of guide projections 360 running in front of the guide surface 350, which are plate-shaped and extend radially to the vicinity of the support surface 330, so that the hose segment 340 is axially captured between the guide projections 360. An edge 370 is formed on the front end of the guide projection 360, which is used as follows when the hose segment 340 is manually threaded out:
[0004] If the hose segment 340 is Fig.11 If the hose section 340 is guided out of the housing of the peristaltic pump as shown in FIG. 1 , in the case of known peristaltic pumps there is the risk that the hose section 340 will get stuck when the rotor 310 assumes an unfavorable rotational position. Fig.11 This state is shown. Only when the rotor 310 is in the Fig. 9 and Fig.10 The edge 370 formed on the guide projection 360 can only be used meaningfully to pass through the hose section 340 when the peristaltic pump is in a rotational position between the positions of the guide projection 360 and the hose section 340. In other words, the person operating the peristaltic pump can only use a limited angle window FW of less than 90° (see Fig.10 ) to pass through the hose segment, in which angle window, the probability of the hose segment 340 getting stuck is small. Summary of the invention
[0005] It is therefore an object of the present invention to improve a peristaltic pump of the corresponding type in such a way that the threading out of a hose section accommodated in the peristaltic pump is simplified, wherein the hose section should be protected as far as possible from damage.
[0006] This object is achieved according to the features of the invention.
[0007] The proposed peristaltic pump is characterized by a sliding edge extending toward the support surface, which is arranged adjacent to the corresponding extrusion element opposite to the direction of rotation of the rotor, and the sliding edge is connected to the rotor in a rotationally fixed manner and can be gripped from below by the inserted hose segment. Due to the arrangement of the sliding edge according to the invention, the pulling movement on the hose segment when manually removing or threading out the hose segment causes the rotor to rotate even under very small pulling forces, thereby reliably preventing the hose from getting stuck between the extrusion element and the pump bed. As a result, the pulling force and friction force applied to the hose segment are reduced, thereby achieving very gentle handling of the hose segment during the threading process. An additional advantage is that, due to the proximity of the sliding edge to the extrusion element or the pressure roller, an area (in which the rotor must be located when manually threading out) becomes larger in order to avoid getting stuck in the hose, thereby simplifying the threading out of the hose segment as a whole.
[0008] The sliding edge can be arranged on a wide variety of components of the peristaltic pump. It is decisive that the sliding edge is located on a component that is connected to the rotor in a rotationally fixed manner, so that the force exerted by the hose section on the sliding edge can cause the rotor to perform a rotational movement. Advantageously, the sliding edge is either a component of the rotor body or a component of a rocker arm connected to the rotor in a rotationally fixed manner or a rotor cover with a cover plate bridging the displacement element.
[0009] The deeper the sliding edge, that is to say the closer the sliding edge is to the pump bed, the earlier the hose section will come into contact with it during the outflow. It is therefore advantageous if the cover plate of the rotor cover thickens in the circumferential direction opposite to the direction of rotation in order to form the sliding edge.
[0010] A particularly simple assembly to produce results when the cover plate has a downwardly bent edge web for forming the sliding edge.
[0011] Advantages with regard to the installation of the extrusion element are achieved when the edge web transitions at its radially outermost end into a circumferential edge section, the height of which tapers toward the extrusion element.
[0012] Preferably, the sliding edge is formed and / or coated from a material having sliding properties that minimize wear. BRIEF DESCRIPTION OF THE DRAWINGS
[0013] An embodiment of the present invention is explained in more detail below with the aid of a schematic diagram. It is shown:
[0014] Figure 1 is a perspective view of an exemplary embodiment of a peristaltic pump that can be used in conjunction with an apparatus for extracorporeal blood treatment;
[0015] Figure 2 is based on Figure 1 A three-dimensional view of the rotor used in the peristaltic pump;
[0016] Figure 3 is a schematic diagram of a peristaltic pump as the hose segment is threaded through the pump bed;
[0017] Figure 4 and Figure 5 is a top view of a peristaltic pump in different rotational positions of the rotor in which a squeeze-proof feed-through of a hose segment is possible;
[0018] Figure 6 is a schematic diagram of a known peristaltic pump of this type for illustrating a rotational position window for reliably threading out a hose segment;
[0019] Figure 7 The peristaltic pump according to the embodiment of the present invention corresponds to Figure 6 's view;
[0020] Figure 8 is a three-dimensional view of a rotor of a known peristaltic pump;
[0021] Fig. 9 and Fig.10 is a top view of a known peristaltic pump in different rotational positions of the rotor in which threading out of the hose segments is recommended; and
[0022] Fig.11 is a schematic illustration of a known peristaltic pump with a rotational position of the rotor that is unfavorable for penetration.
[0023] Among them: A-rotor axis; WZF-center angle of guide surface; D-rotation direction; PN-low pressure side; PP-high pressure side; FW, FW*-angle window; FD-force component in the rotation direction; 5-pump housing; 7-pump bed; 10-rotor; 20-extrusion element; 30-support surface; 40-pump segment; 42-rotor base; 42A-rotor cover; 43-cover plate; 44-key; 45-edge tab; 46-guide surface; 48-guide surface; 54, 56-matching body; 62, 64-connector; 70-upper guide pin; 72-lower guide pin; 80-sliding edge; 310-rotor; 320-extrusion element; 330-support surface; 340-pump segment; 350-guide surface; 360-guide protrusion; 370-edge. DETAILED DESCRIPTION
[0024] exist Figures 1 to 6 , for example, is used in a dialysis machine. The task of the peristaltic pump is to convey a defined volume of medium, for example blood or dialysis fluid, by deforming and clamping an elastically deformable fluid line. Peristaltic pumps for conveying blood usually convey from a negative pressure side PN (low pressure side) to a positive pressure side PP (high pressure side).
[0025] As in Figure 1 As shown in the figure, the peristaltic pump has a pump housing 5, in which a rotor 10 rotatable around a rotor axis A is accommodated, the rotor having at least two extrusion elements 20 offset from each other in the circumferential direction or along the diameter, which are pressure rollers, and the pump housing has a support surface 30 extending in an arc shape around the rotor axis A and radially spaced apart from the rotor 10, the support surface being provided for radially supporting a radially introduced between the rotor 10 and the support surface 30. Figure 1 The pressing element 20 is supported, for example, in a spring-loaded manner on a rocker arm (not shown in greater detail), which in turn is fastened to the rotor 10 so that it can pivot.
[0026] The hose segments used in peristaltic pumps are referred to below as pump segments. Figure 1 The hose section not shown in the drawing is not supported in the pump bed with reference numeral 7, but via two guide pins 70, 72 (see Figure 2 ) is held in a central position relative to the extrusion element 20. The support surface 30 is usually formed by a cylinder surface, but the cylinder surface can also be recessed in a groove-like manner. The direction of rotation of the rotor 10 when conveying fluid is indicated by the arrow D.
[0027] Figure 2The rotor 10 is shown in detail. The rotor has a rotor base body 42 and a rotor cover 42A, which are not shown in more detail. The rotor 10 can be removed from the drive shaft, which is not shown in more detail, by means of a laterally operable button 44. The pressing element 20 is rotatably mounted on a rocker arm 41 which is supported in an articulated spring-like manner on the rotor base body 42.
[0028] The rotor cover 42A, which rotates together with the rotor 10, carries guide surfaces 46, 48 in the region of the extrusion element 20, wherein one guide surface 46 runs in front of the extrusion element 20 and the other guide surface 48 runs behind the extrusion element 20. Therefore, the guide surfaces 46, 48 are arranged and designed adjacent to both sides of the extrusion element 20 in the circumferential direction, so that the guide surfaces are as shown from Figure 3 As can be seen in FIG. 1 , corresponding arc-shaped guide channels FK1 and FK2 are formed together with the support surface 30, in which the hose segment 40, also called pump segment, inserted into the pump bed 7 can be radially captured with a predetermined clearance fit. Figure 3 It can be seen that the pump segment 40 is fixed to the pump housing 5 during operation of the peristaltic pump by means of two fitting bodies 54 , 56 which are fixed in a non-movable manner to connections 62 , 64 of the pump housing 5 .
[0029] As according to Figure 2 As can be seen from the illustration of the rotor cover 42, that is, the part connected to the rotor 10 in a rotationally fixed manner, has a portion arranged adjacent to the corresponding extrusion element 20 opposite to the rotation direction D of the rotor 10, extending toward the support surface, and extending in the direction of rotation of the rotor 10. Figure 2 The sliding edge 80 indicated by the red arrow in FIG. 8 can be as follows: Figure 3 To remove it, the inserted hose segment, ie the pump segment 40 , is gripped from below.
[0030] When the pump segment 40 should be passed out, such as in Figure 3 As shown in FIG, the matching body 54 on the low-pressure side PN is detached from the pump housing 5 and pulled upward from the pump bed 7. Here, the rotor 10 should occupy Figure 3 Since the pump segment 40 grips the sliding edge 80 from below, when Figure 3 When pulled upward as shown in FIG. , the pump segment 40 contacts the sliding edge 80 in the upwardly bent state, so that the contact force has a force component directed in the rotation direction D of the rotor 10 . Figure 2 and Figure 3 If the pump segment 40 is to be pulled out, a small pulling force applied by hand is sufficient to rotate the rotor 10 in the direction of the arrow D and gradually release the pump segment 40 so that the pump segment can be pulled out of the pump bed. The pulling forces and contact forces acting on the pump segment 40 remain relatively limited in this way, which is beneficial to the durability of the hose segment.
[0031] In order to additionally minimize the stresses on the pump segment 40 , the sliding edge 80 is formed and / or coated with a material having sliding properties that minimize wear.
[0032] In the exemplary embodiment shown, the sliding edge 80 is located between the pressure roller, i.e. the pressure element 20, and the guide surface 48 running behind the pressure element in the direction of rotation, i.e. directly adjacent to the pressure element 20. This arrangement results in a significantly larger area, in which the rotor 10 must be located during manual insertion to prevent the pump segment 40 from getting stuck, than is the case with known peristaltic pumps. The rotor 10 must be located in the Figure 4 The position shown in 1 and in Figure 5 In the positions between the positions 2 shown in FIG. 1 , these positions are separated from one another by a rotation angle FW* in the order of magnitude of approximately 120° to 130°. Manual threading by an operator is thus significantly simpler, since the operator no longer has to pay close attention to the position of the rotor 10 .
[0033] exist Figure 6 and Figure 7 The comparison of the rotational positions between which the rotor 310 in the prior art and the rotor 10 in the design according to the present application must be located in order to easily pass through the pump segment 40 or 340. Figure 6 A known rotor 310 is shown in FIG. 1 , which has two extreme rotational positions, Figure 7 1 shows a rotor 10 according to the present application. In a first rotational position, the rotor is shown with a solid line, and in a second extreme rotational position, the rotor is shown with a dashed line. It can be seen that the permissible angle window FW can be significantly expanded to a value FW* by means of the positioning and design of the sliding edge 80 according to the present application.
[0034] The function of the sliding edge 80 is always fulfilled when the sliding edge is designed or attached to a component of the peristaltic pump that is connected to the rotor 10 in a rotationally fixed manner. In the exemplary embodiment shown, this component is formed by a rotor cover 42 having a cover plate 43 that overlaps the pressure element 20. Figure 2 As can be seen in FIG. 4 , the cover plate 43 is thickened in the circumferential direction opposite to the rotation direction D in order to construct the sliding edge 80, whereby the sliding edge 80 moves closer to the pump bed 7. This thickening can be achieved, for example, by the following manner, that is, the cover plate 43 is thickened in the circumferential direction opposite to the rotation direction D. Figure 2 As best shown in FIG. 4 , the sliding edge 80 has an angled edge web 45 for forming the sliding edge 80 . Here, the edge web 45 transitions at its radially outermost end 45R into a circumferential edge section, the height of which decreases gradually toward the pressing element 20 .
[0035] Of course, deviations from the described embodiments are possible without departing from the essential idea of the invention.
[0036] The sliding edge 80 can therefore also be a component of the rotor body or of a rocker arm connected to the rotor 10 and carrying the displacement element.
[0037] In the above-described peristaltic pump, two extrusion elements are provided, which are arranged rigidly or at a fixed angle of 180° to each other in a relative position of 180°. However, it can also be provided that there are more than two extrusion elements and that these extrusion elements are designed to be positionable relative to each other in the direction of rotation at an angle. For this purpose, the extrusion elements can be arranged on a rotor arm, which can be designed to be pivotable relative to the rotor in the circumferential direction.
[0038] The pressing elements do not have to be designed as pressing rollers or pressure rollers, which advantageously roll on the fluid line in a material-protecting manner. Sliding shoes that slide on the hose section can also be provided.
[0039] The present invention therefore provides a peristaltic pump, in particular for conveying fluids in an extracorporeal blood treatment device, the peristaltic pump having a pump housing, in which a rotor rotatable about a rotor axis is accommodated, the rotor having at least two displacement elements offset from each other in the circumferential direction, and the pump housing having a support surface extending in an arc shape about the rotor axis and radially spaced from the rotor, the support surface being provided for supporting a hose segment that can be radially introduced between the rotor and the support surface. In order to simplify the manual insertion of the hose segment, the peristaltic pump has a sliding edge extending toward the support surface, which is arranged adjacent to the corresponding displacement element opposite to the direction of rotation of the rotor, the sliding edge being connected to the rotor in a rotationally fixed manner and can be gripped from below by the inserted hose segment.
Claims
1. A peristaltic pump, in particular for conveying fluid in an apparatus for extracorporeal blood treatment, the peristaltic pump having A pump housing (5) in which a rotor (10) rotatable about a rotor axis (A) is accommodated, the rotor having at least two extrusion elements (20) offset from one another in the circumferential direction, and the pump housing having a support surface (30) extending in an arc shape about the rotor axis (A) and radially spaced from the rotor (10), the support surface being provided for supporting a hose segment (40) which can be radially introduced between the rotor (10) and the support surface (30), characterized in that A sliding edge (80) extending toward the support surface (30) is arranged adjacent to the corresponding pressing element (20) opposite to the direction of rotation (D) of the rotor (10), is connected to the rotor (10) in a rotationally fixed manner and can be gripped from below by an inserted hose section (40).
2. The peristaltic pump according to claim 1, characterized in that: The sliding edge (80) is a component of a rotor body (42), a rocker arm connected to the rotor (10) in a rotationally fixed manner, or a rotor cover (42A) having a cover plate (43) bridging the displacement element (20).
3. The peristaltic pump according to claim 2, characterized in that: The cover plate (43) thickens in the circumferential direction counter to the direction of rotation (D) in order to form the sliding edge (80).
4. The peristaltic pump according to claim 3, characterized in that: The cover plate (43) has a bent-over edge web (45) for forming the sliding edge (80).
5. The peristaltic pump according to claim 4, characterized in that: The edge web (45) transitions at its radially outermost end (45R) into a circumferential edge section, the height of which tapers toward the extrusion element (20).
6. The peristaltic pump according to any one of claims 1 to 5, characterized in that: The sliding edge (80) is formed and / or coated with a material having sliding properties that minimize wear.