Press-in tool for a plunger pump for hemodialysis

Abstract

The utility model discloses a kind of press-in tool for plunger pump for hemodialysis, including mounting seat, located inside mounting seat and the contact of pad block with plunger pump shell end part, lead screw through one end of mounting seat, one end of the lead screw is contact type connection with press-in block one, press-in block one is pushed along linear plunger sleeve with lead screw and enters the inside of plunger pump shell. Realize the quick assembly of plunger sleeve in plunger pump shell, ensure the hole position alignment of both after assembly simultaneously, improve the stability and precision of flow when blood purification.

Description

Technical Field

[0001] This utility model relates to the field of plunger pump technology, specifically to a pressure-feeding tool for a plunger pump used in hemodialysis. Background Technology

[0002] A piston pump is a positive displacement pump whose core working principle is to achieve the intake and discharge of liquid in a hemodialysis machine through the periodic change of a sealed volume. It is characterized by high output pressure, precise and controllable flow rate, and high efficiency.

[0003] Currently, in hemodialysis machines, the plunger pump is relatively small, requiring the plunger sleeve to be pressed into the plunger pump housing. Existing technology often uses manual pressing during the pressing process, which results in the holes inside the plunger sleeve not being aligned with the plunger pump housing after assembly, thus affecting the stability and accuracy of the blood flow during the blood purification process.

[0004] Therefore, this application is submitted. Utility Model Content

[0005] The purpose of this invention is to provide a press-fit fixture for a plunger pump used in hemodialysis, which enables the plunger to be quickly assembled into the plunger pump housing, while ensuring that the holes of the two are aligned after assembly, thereby improving the stability and accuracy of the flow rate during blood purification.

[0006] To solve the above-mentioned technical problems, the present invention adopts the following solution: A pressing tool for a plunger pump used in hemodialysis includes a mounting base, a pad located inside the mounting base and in contact with the end of the plunger pump housing, and a lead screw passing through one end of the mounting base. One end of the lead screw is connected to a pressing block, which pushes the plunger sleeve into the interior of the plunger pump housing along a straight line with the lead screw.

[0007] Furthermore, the mounting base has two mutually communicating sliding grooves symmetrically arranged on the side perpendicular to the pad. The sliding groove is provided with a fixed block and a guide rod located between the two fixed blocks. The press-in block is fitted around the outer periphery of the guide rod, with one end of it contacting the end of the plunger sleeve and the other end contacting the end of the lead screw.

[0008] Furthermore, the width of the first sliding groove is greater than the width of the second sliding groove, and the first sliding groove is farther away from the first pressing block.

[0009] Furthermore, the outer diameter of the fixed block is greater than the width of the sliding groove.

[0010] Furthermore, a nut through which a lead screw is fixed is provided on one side of the mounting base, and the outer circumferential surface of the lead screw is threaded inside the nut.

[0011] Furthermore, the plunger sleeve, the press-in block, and the lead screw are all located on the same central axis.

[0012] Furthermore, one side of the pad is provided with a limiting groove that contacts the end of the plunger pump housing.

[0013] Furthermore, the bottom of the mounting base is provided with a placement block for supporting the plunger sleeve.

[0014] Furthermore, the top of the placement block is provided with an arc-shaped groove to accommodate the outer circumferential surface of the plunger sleeve.

[0015] Furthermore, it also includes a second press-in block sleeved on the outer periphery of the guide rod and used to push the spherical bearing.

[0016] The beneficial effects of this utility model are: This invention features a lead screw within the mounting base, guide rods on both sides of the mounting base, and a pressing block fitted around the outer periphery of the guide rods. The rotation of the lead screw within the nut causes the pressing block to push the plunger sleeve along a straight line into the interior of the plunger pump housing, reducing the offset during the pressing process. This ensures that the holes of the plunger sleeve and the plunger pump housing are aligned when the plunger sleeve enters the housing, improving the assembly efficiency of the plunger sleeve and enhancing the stability and accuracy of the flow rate during blood purification. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the structure of this utility model; Figure 2 This is a top view of the structure of this utility model; Figure 3 This is a schematic diagram of the assembly structure of the lead screw and guide rod of this utility model.

[0018] Reference numerals: 1-Mounting base, 100-Sliding groove one, 101-Sliding groove two, 2-Padded block, 20-Limiting groove, 3-Placement block, 30-Groove, 4-Press-in block one, 5-Press-in block two, 6-Nut, 7-Threaded rod, 8-Introducing rod, 80-Fixing block, 9-Plunger sleeve. Detailed Implementation

[0019] The present invention will be further described in detail below with reference to the embodiments and accompanying drawings, but the implementation of the present invention is not limited thereto.

[0020] In the description of this utility model, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "longitudinal", "lateral", "horizontal", "inner", "outer", "front", "rear", "top", "bottom", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the utility model product is in use. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0021] In the description of this utility model, it should also be noted that, unless otherwise explicitly specified and limited, the terms "set up," "have," "install," "connect," and "connect" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0022] Example 1 Embodiment 1 of this utility model is a pressing tool for a plunger pump used in hemodialysis, including a mounting base 1, a pad 2 located inside the mounting base 1 and in contact with the end of the plunger pump housing, and a lead screw 7 passing through one end of the mounting base 1. One end of the lead screw 7 is connected to a pressing block 4, and the pressing block 4 pushes the plunger sleeve 9 into the interior of the plunger pump housing along a straight line with the lead screw 7.

[0023] Reference Figure 1 and Figure 2 This utility model mainly uses a pad 2 inside the mounting base 1 to limit the position of the plunger pump housing inside it. The plunger sleeve 9 is pushed into the interior of the plunger pump housing by the movement of the screw 7 and the pressing block 4. During the process of the plunger sleeve 9 entering, it always moves in a straight line, which ensures that the offset caused by manual assembly is reduced during the movement. When the plunger sleeve 9 enters the interior of the plunger pump housing, the holes of the two are aligned, which improves the assembly efficiency of the plunger sleeve 9.

[0024] In addition, in order to improve the stability of the pressing block 4 when moving linearly, the mounting base 1 is provided with a sliding groove 100 and a sliding groove 101 that are perpendicular to the pad block 2 and are mutually connected. The sliding groove 100 is provided with a fixing block 80 and a guide rod 8 located between the two fixing blocks 80. The pressing block 4 is sleeved on the outer periphery of the guide rod 8 and one end of it contacts the end of the plunger sleeve 9, and the other end contacts the end of the lead screw 7.

[0025] Reference Figure 3 An inlet rod 8 is provided, and the fixing blocks 80 at both ends of the inlet rod 8 are located inside the side of the mounting base 1 perpendicular to the inlet rod 8, so that the inlet rod 8 and the lead screw 7 are perpendicular to each other. This ensures that the lead screw 7 moves in a straight line as it pushes the plunger sleeve 9 through the pressing block 4, thereby reducing the offset during the pressing process and providing conditions for the subsequent alignment of the holes of the two.

[0026] Meanwhile, the assembly of the fixing blocks 80 within the mounting base 1 is a limiting assembly, meaning that the fixing blocks 80 at both ends of the guide rod 8 are respectively located within the sliding groove one 100, and the guide rod 8 passes through the sliding groove two 101. The width of the sliding groove one 100 is greater than the width of the sliding groove two 101, and the sliding groove one 100 is farther away from the pressing block one 4; the outer diameter of the fixing block 80 is greater than the width of the sliding groove two 101. Mainly, by making the width of the sliding groove two 101 smaller than the width of the sliding groove one 100, the fixing blocks 80 are confined within the sliding groove one 100, ensuring the use of both fixing blocks 80. The fixing blocks 80 can be assembled with the ends of the guide rod 8 using a fixed or detachable connection method, which is existing technology and will not be listed here; the specific method can be set according to actual needs. The sliding groove two 101 provides conditions for the passage of the guide rod 8 on the one hand, and confines the fixing blocks 80 to the sliding groove one 100 on the other.

[0027] Example 2 This embodiment 2 is implemented based on embodiment 1. A nut 6 through which a lead screw 7 passes is fixed to one side of the mounting base 1, and the outer circumferential surface of the lead screw 7 is threaded into the nut 6. The nut 6 primarily provides conditions for the lead screw 7 to rotate within the mounting base 1, preventing the lead screw 7 from being directly used for movement within the mounting base 1, thus extending the service life of the mounting base 1. It also facilitates the replacement of the nut 6, reducing maintenance costs. The connection of the nut 6 within the mounting base 1 can be achieved using bolt assembly, facilitating replacement.

[0028] To ensure linear movement during the pressing of the plunger sleeve 9, the plunger sleeve 9, the pressing block 4, and the lead screw 7 are aligned on the same central axis. A gap exists between the lead screw 7 and the pressing block 4; when they come into contact, they trigger a push on the pressing block 4. Furthermore, the guide rod 8 is threaded, allowing the pressing block 4 to be threaded onto the outer circumference of the guide rod 8. Adjusting the position of the pressing block 4 ensures that it and the lead screw 7 are aligned on the same horizontal central axis.

[0029] In some preferred embodiments, the pad 2 has a limiting groove 20 on one side that contacts the end of the plunger pump housing. The limiting groove 20 is mainly a concave groove, so that one end of the plunger pump housing is placed horizontally in the limiting groove 20. The limiting groove 20 and the lead screw 7 are also on the same central axis. In addition, the pad 2 can be detachably connected to the inner bottom surface of the mounting base 1, so that the pad 2 can be replaced to make the limiting groove 20 on its side fit the outer diameter of the plunger pump housing to be assembled, thereby improving the reusability of the device.

[0030] In addition, the bottom of the mounting base 1 is provided with a placement block 3 for supporting the plunger sleeve 9. The top of the placement block 3 is provided with an arc-shaped groove 30 to accommodate the outer circumference of the plunger sleeve 9. The placement block 3 can be detachably located at the bottom of the mounting base 1, and its top is provided with an arc-shaped groove 30. This placement block 3 is also on the same central axis as the lead screw 7. The arc-shaped groove 30 is used to place the plunger sleeve 9, providing support for the plunger sleeve 9, and at the same time, it allows the plunger sleeve 9 to enter the interior of the plunger pump outer sleeve under the push of the pressing block 4, completing the pressing action.

[0031] In some preferred embodiments, a second press-in block 5 is further included, which is sleeved on the outer periphery of the guide rod 8 and used to push the spherical bearing. The second press-in block 5 can be moved to a suitable position along the guide rod 8 by means of a threaded connection, so that when the lead screw 7 pushes the first press-in block 4, the second press-in block 5 moves linearly, thereby pushing the spherical bearing to assemble and improving the utilization rate of this press-in fixture.

[0032] The working principle of this utility model is as follows: In use, first, place the plunger pump housing and plunger sleeve 9 into the pad block 2 and the placement block 3 respectively. Adjust the position of the hole in the plunger sleeve 9 so that the hole in the plunger sleeve 9 is on the same plane as the hole in the plunger pump housing. Then, adjust the position of the pressing block 4 so that it contacts the end of the plunger sleeve 9. Rotate the lead screw 7 so that it contacts the pressing block 4 and pushes the plunger sleeve 9 linearly into the interior of the plunger pump housing, completing the pressing operation. The plunger sleeve 9 always moves in a straight line, reducing the offset during the pressing process. This ensures that when the plunger sleeve 9 enters the interior of the plunger pump housing, the holes of both are aligned, improving the assembly efficiency of the plunger sleeve 9 and enhancing the stability and accuracy of the flow rate during blood purification.

[0033] The above description is merely a preferred embodiment of the present utility model and is not intended to limit the present utility model in any way. Any simple modifications, equivalent substitutions, and improvements made to the above embodiments based on the technical essence of the present utility model and within the spirit and principles of the present utility model shall still fall within the protection scope of the present utility model.

Claims

1. A pressure-feeding fixture for a plunger pump used in hemodialysis, characterized in that, Includes a mounting base (1), a pad (2) located inside the mounting base (1) and in contact with the end of the piston pump housing, and a lead screw (7) passing through one end of the mounting base (1). One end of the lead screw (7) is connected to a pressing block (4), which pushes the piston sleeve (9) into the interior of the piston pump housing along a straight line with the lead screw (7).

2. The injection fixture for a plunger pump used in hemodialysis according to claim 1, characterized in that, The mounting base (1) has two mutually penetrating sliding grooves, one (100) and the other (101), symmetrically arranged on the side perpendicular to the pad (2). The sliding groove (100) is provided with a fixing block (80) and an inlet rod (8) located between the two fixing blocks (80). The pressing block (4) is sleeved on the outer periphery of the inlet rod (8) and one end of it contacts the end of the plunger sleeve (9), and the other end contacts the end of the screw (7).

3. The injection fixture for a plunger pump used in hemodialysis according to claim 2, characterized in that, The width of the sliding groove one (100) is greater than the width of the sliding groove two (101), and the sliding groove one (100) is far away from the pressing block one (4).

4. The injection fixture for a plunger pump used in hemodialysis according to claim 2, characterized in that, The outer diameter of the fixed block (80) is greater than the width of the sliding groove (101).

5. The injection fixture for a plunger pump used in hemodialysis according to claim 2, characterized in that, A nut (6) through which a lead screw (7) passes is fixed on one side of the mounting base (1), and the outer circumferential surface of the lead screw (7) is threaded inside the nut (6).

6. The injection fixture for a plunger pump used in hemodialysis according to claim 2, characterized in that, The plunger sleeve (9), the press block (4), and the lead screw (7) are on the same central axis.

7. The injection fixture for a plunger pump used in hemodialysis according to claim 2, characterized in that, The pad (2) has a limiting groove (20) on one side that contacts the end of the piston pump housing.

8. The injection fixture for a plunger pump used in hemodialysis according to claim 2, characterized in that, The bottom of the mounting base (1) is provided with a placement block (3) for supporting the plunger sleeve (9).

9. The injection fixture for a plunger pump used in hemodialysis according to claim 8, characterized in that, The top of the placement block (3) is provided with an arc-shaped groove (30) to accommodate the outer circumference of the plunger sleeve (9).

10. The injection tooling for a plunger pump used in hemodialysis according to claim 8, characterized in that, It also includes a second press-in block (5) that is sleeved on the outer periphery of the guide rod (8) and used to push the joint bearing.

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