Plunger balancing device and dialysis equipment

Abstract

The utility model provides a plunger balancing device and dialysis equipment, the plunger balancing device comprises a pump body and a plunger, the pump body is provided with a cavity, the plunger is arranged in the cavity, the plunger is in sliding sealing connection with the cavity, and the plunger is used for dividing the cavity into a first cavity and a second cavity; the pump body is provided with a first liquid inlet and a first liquid outlet which are communicated with the first cavity, and a second liquid inlet and a second liquid outlet which are communicated with the second cavity; the four valve bodies are respectively arranged at the first liquid inlet, the first liquid outlet, the second liquid inlet valve and the second liquid outlet; the linear driver is connected with the plunger and used for driving the plunger to move along the cavity. According to the plunger balancing device, the plunger structure is driven to do linear reciprocating motion in a linear driving mode, and compared with a rotary driving scheme, the overall operation precision and stability of the plunger balancing device are improved.

Description

Technical Field

[0001] This application relates to the field of medical device technology, and more specifically, to a plunger balancing device. It also relates to a dialysis apparatus including the plunger balancing device. Background Technology

[0002] In the field of medical devices, hemodialysis is a commonly used treatment method. Its main purpose is to remove metabolic waste and excess water from the patient's body using dialysate. During hemodialysis, the flow balance of the dialysate directly affects the treatment's effectiveness and safety; therefore, maintaining the flow balance of the dialysate is crucial.

[0003] Currently, the driving source for compound pumps on the market mainly adopts a rotary drive converted into a linear reciprocating motion scheme. This requires high positioning accuracy, has a complex structure, poor stability, and is prone to accuracy deviations. Utility Model Content

[0004] This application provides a plunger balancing device and a dialysis device, which improves the overall operating accuracy and stability of the plunger balancing device.

[0005] In a first aspect, this application provides a plunger balancing device, including a pump body and a plunger. The pump body has a cavity, and the plunger is disposed in the cavity and slidably sealed to the cavity. The plunger is used to divide the cavity into a first chamber and a second chamber. The pump body has a first inlet and a first outlet communicating with the first chamber, and a second inlet and a second outlet communicating with the second chamber. It also includes: four valve bodies, respectively disposed at the first inlet, the first outlet, the second inlet, and the second outlet; and a linear actuator connected to the plunger for driving the plunger to move along the cavity.

[0006] In some embodiments, the inner wall of the pump body is provided with a first ceramic layer, and the outer wall of the plunger is provided with a second ceramic layer; or, the inner wall of the pump body is provided with a ceramic layer, and the plunger is a ceramic plunger.

[0007] In some embodiments, the two end faces of the plunger along the first direction form the first chamber and the second chamber with the cavity, respectively. The first chamber and the second chamber are respectively disposed on both sides of the plunger along the first direction, and the volume of the first chamber and the second chamber is adjustable.

[0008] In some embodiments, each of the valve bodies is a check valve.

[0009] In some embodiments, the check valve is an electrically operated check valve, which is connected to a controller.

[0010] In some embodiments, the linear actuator includes a linear motor, a piezoelectric actuator, a ball screw, a pneumatic cylinder, or a hydraulic cylinder.

[0011] In some embodiments, a connection assembly is further included to connect the linear drive and the plunger. The connection assembly includes a first connector, a second connector, and a plurality of fasteners. The first connector is connected to the linear drive via the fasteners, the second connector is fixed to the plunger, and the second connector is connected to the first connector via the fasteners.

[0012] In some embodiments, the first liquid inlet and the second liquid inlet are respectively disposed on the upper part of the cavity, the first liquid outlet and the second liquid outlet are respectively disposed on the lower part of the cavity, the pump body is provided with a sliding part distributed along the first direction, the second connecting member passes through the sliding part and is connected to the plunger, and the outer peripheral surface of the plunger is sealed to the inner wall of the pump body.

[0013] Secondly, this application also provides a dialysis device, including the aforementioned plunger balancing device.

[0014] In this embodiment, a plunger structure is employed. The plunger is installed within the pump body cavity and driven by a linear actuator to perform linear reciprocating motion along the cavity, simultaneously changing the size of the cavity. This allows for liquid to be drawn in through the inlet of one chamber and discharged through the outlet of the other, or vice versa. This simultaneous change in the volume of the inlet and outlet chambers balances the dialysate flow rate, effectively avoiding the flow imbalance problem that may occur when adjusting the flow rate in traditional unidirectional flow pumps, thereby improving dialysis accuracy and effectiveness. Furthermore, this application uses a linear drive to drive the linear reciprocating motion of the plunger structure. Compared to rotary drive schemes, this improves the overall operational accuracy and stability of the plunger balancing device, thus enhancing the stability and accuracy of the entire operating system. This is particularly suitable for medical instruments with high precision requirements, such as dialysis equipment. Attached Figure Description

[0015] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of this application. For those skilled in the art, other drawings can be obtained based on the provided drawings without creative effort.

[0016] Figure 1 This is a schematic diagram of the structure of a plunger balancing device provided in some embodiments of this application;

[0017] Figure 2Another structural schematic diagram of the plunger balancing device provided in some embodiments of this application (valve body not shown).

[0018] Figure 3 Cross-sectional views of a plunger balancing device provided in some embodiments of this application;

[0019] Figure 4 A cross-sectional view from another perspective of the plunger balancing device provided in some other embodiments of this application.

[0020] The attached figures are labeled as follows:

[0021] 1. Pump body; 2. Plunger; 3. Valve body; 4. Linear actuator; 5. Connecting assembly;

[0022] 11. Cavity;

[0023] 111. First chamber; 112. Second chamber; 113. First inlet; 114. First outlet; 115. Second inlet; 116. Second outlet; 51. First connector; 52. Second connector;

[0024] a. Axis;

[0025] X, the first direction. Detailed Implementation

[0026] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0027] Please refer to Figure 1 and Figure 2 , Figure 1 This is a schematic diagram of the structure of the plunger balancing device provided in some embodiments of this application. Figure 2 A schematic diagram of the plunger balancing device provided in some embodiments of this application from another perspective (valve body not shown).

[0028] This application provides a plunger balancing device, including a pump body 1 and a linear actuator 4. The linear actuator 4 is connected to a plunger 2 and provides driving force to the plunger 2, thereby driving the plunger 2 to move along a cavity 11. The pump body 1 includes a pump body 1 and a plunger 2, and the pump body 1 internally encloses to form a cavity 11. The plunger 2 is disposed in the cavity 11, and the outer peripheral surface of the plunger 2 is slidably connected to the inner wall of the cavity 11, so that the plunger 2 can move along the cavity 11. While ensuring the sliding connection between the plunger 2 and the cavity 11, by ensuring the machining accuracy of the pump body 1 and the plunger 2, the gap between the outer peripheral surface of the plunger 2 and the inner wall of the cavity 11 is small, ensuring good sealing performance between the plunger 2 and the cavity 11.

[0029] The plunger 2 forms a first chamber 111 with the cavity 11 along the first direction X at its first end face, and a second chamber 112 with the cavity 11 along the second end face of the plunger 2 along the first direction X. The first chamber 111 and the second chamber 112 are cavities 11 with adjustable volumes. The pump body 1 is provided with a first inlet 113 and a first outlet 114 corresponding to the first chamber 111, and both the first inlet 113 and the first outlet 114 are connected to the first chamber 111. The pump body 1 is provided with a second inlet 115 and a second outlet 116 corresponding to the second chamber 112, and both the second inlet 115 and the second outlet 116 are connected to the first chamber 111.

[0030] The pump body 1 also includes a first inlet valve body, a first outlet valve body, a second inlet valve body, and a second outlet valve body. The first inlet valve body is disposed at the first inlet port 113 and is used to regulate the inlet flow rate and liquid flow at the first inlet port 113. The first outlet valve body is disposed at the first outlet port 114 and is used to regulate the outlet flow rate and liquid flow at the first outlet port 114. The second inlet port 115 and the second outlet port 116 are respectively provided with the second inlet valve body and the second outlet valve body. The linear actuator 4 is drivenly connected to the plunger 2, providing linear driving force to the plunger 2, thereby driving the plunger 2 to move along the cavity 11.

[0031] Exemplarily, the linear actuator 4 can be, but is not limited to, a linear motor, a piezoelectric actuator, a ball screw, a cylinder, or a hydraulic cylinder. The linear actuator 4 can be connected to the plunger 2 via a connector, which can be a coupling and / or a connecting rod. The pump body 1 is provided with a slide, and the connector is disposed within the slide, maintaining a sealed connection with the slide, for example, by providing a seal between the connector and the slide. The linear actuator 4 acts as a drive source, linearly driving the plunger 2 to perform linear reciprocating motion within the cavity 11 via the connecting rod.

[0032] Optionally, the first liquid inlet 113 in this application is located at the bottom of the cavity 11, the first liquid outlet 114 is located at the top of the first chamber 111, and the second liquid inlet 115 and the second liquid outlet 116 are respectively located at the bottom and top of the second chamber 112 to improve the liquid inlet and outlet efficiency.

[0033] This application adopts a plunger 2 structure, which is installed in the cavity 11 of the whole body. The piston rod is driven by the drive source to make linear reciprocating motion, and at the same time, the size of the cavity 11 is changed to realize the liquid intake on one side and the liquid discharge on the other side, or the liquid discharge on one side and the liquid intake on the other side.

[0034] This application employs a linear drive source to drive the plunger 2 structure in a linear reciprocating motion within the inlet and outlet side chambers 11. This allows for simultaneous changes in the size of the inlet and outlet side chambers 11, thereby achieving a balance in dialysate flow rate. This structure effectively avoids the imbalance problems that may occur when adjusting the flow rate in traditional unidirectional flow pumps, thus improving dialysis efficiency. The linear drive source, driving the plunger 2 structure in a linear reciprocating motion, enhances the stability and accuracy of the entire operating system, significantly improving the precision of the dialysis equipment and enhancing operational stability.

[0035] For example, the first direction X in this application can be Figure 1 and Figure 4 The direction along the axis a of the cavity 11 of the pump body 1.

[0036] In one specific embodiment, the connecting component 5 includes a first connector 51, a second connector 52 and a plurality of fasteners. The first connector 51 is connected to the linear drive 4 via fasteners, the second connector 52 is fixed to the plunger 2, and the second connector 52 is connected to the first connector 51 via fasteners.

[0037] like Figure 3 As shown. Both the first connecting member 51 and the second connecting member 52 may include a connecting rod, a connecting plate, or a connecting shaft. The first connecting member 51 is connected to the linear actuator 4 by fasteners such as screws or couplings, and the second connecting member 52 is connected to the plunger 2 by fasteners such as screws. The linear driving force is transmitted to the plunger 2 through the first connecting member 51 and the second connecting member 52, thereby driving the plunger 2 to move linearly along the cavity 11.

[0038] To ensure the movement accuracy of the plunger 2, a sliding part can be provided on the pump body 1. This sliding part includes a groove, and the sliding part is distributed along the first direction X. A second connecting member 52 passes through the groove, and its other end is connected to the plunger 2. Under the drive of linear force, the sliding part can guide the plunger 2 to move in the direction defined by the sliding part, thereby improving the movement accuracy of the plunger 2. In addition, the second connecting member 52 passes through the sliding part and is fixedly connected to the plunger 2. The outer peripheral surface of the plunger 2 is sealed to the inner wall of the pump body 1. In this way, while ensuring the guided movement of the plunger 2, liquid leakage in the cavity 11 can be effectively prevented.

[0039] In one specific embodiment, the inner wall of the pump body 1 is provided with a first ceramic layer, and the outer wall of the plunger 2 is provided with a second ceramic layer. The ceramic layer can be sprayed onto the substrate surface of the pump body 1 and the plunger 2, or the ceramic material can be deposited onto the substrate surface using physical vapor deposition or chemical vapor deposition. Alternatively, the ceramic layer can be formed by heat treatment after coating, followed by machining to form a high-precision surface. The first and second ceramic layers after processing have high assembly precision to ensure both the sliding fit between the pump body 1 and the plunger 2 and the sealing performance between them.

[0040] Alternatively, a ceramic layer can be provided on the inner wall of the pump body 1, and the plunger 2 can be made of ceramic material, or both the pump body 1 and the plunger 2 can be made of ceramic material. Utilizing the sliding fit between ceramic materials reduces the complexity of sealing with sealing structures such as sealing rings, simplifies the assembly process, improves production efficiency, and reduces maintenance costs. Furthermore, due to the high hardness and low coefficient of friction of ceramic materials, the wear resistance of the pump body 1 and the plunger 2 can be improved, extending their service life and enhancing the reliability of the plunger 2 balancing device.

[0041] It should be noted that the sealing material between the pump body 1 and the piston is not limited to ceramic, but can also be a variety of other materials, such as carbon fiber, silicon carbide, alumina seals, etc. The sealing method can also be a variety of other methods, such as expansion seals, hydraulic or pneumatic seals, etc. This application does not limit these methods.

[0042] In one specific embodiment, the first chamber 111 and the second chamber 112 are respectively formed between the two end faces of the plunger 2 along the first direction X and the cavity 11, as shown below. Figure 3 and Figure 4 As shown, the first chamber 111 and the second chamber 112 of the pump body 1 are respectively located on both sides of the plunger 2 along the first direction X. During movement, the plunger 2 and the pump body 1 form the first chamber 111 and the second chamber 112 with adjustable volumes. Both the first chamber 111 and the second chamber 112 can serve as inlet chambers or outlet chambers. When the linear drive device moves towards one side of the chamber, the chamber on that side is compressed and thus serves as the outlet chamber, while the expanded chamber on the other side serves as the supply chamber. The linear drive device drives the plunger 2 to make linear reciprocating motion within the chamber 11, which can simultaneously change the volume of the first chamber 111 and the second chamber 112, thereby achieving a balance in the dialysate flow rate.

[0043] Optionally, such as Figure 4As shown, the first liquid inlet 113 and the second liquid inlet 115 are respectively located in the upper part of the cavity 11, and the first liquid outlet 114 and the second liquid outlet 116 are respectively located in the lower part of the cavity 11, so as to form a structure of liquid inlet in the lower part and liquid outlet in the upper part. The liquid level can be stably controlled by the valve body 3 to avoid being affected by liquid level fluctuations. The top liquid outlet can also serve as an exhaust channel to prevent gas from stagnating.

[0044] The pump body 1 is provided with a sliding part, which is distributed along the first direction X. The second connecting member 52 passes through the sliding part and is connected to the plunger 2. The outer peripheral surface of the plunger 2 is sealed to the inner wall of the pump body 1, such as by the ceramic seal mentioned above or by using a sealing structure such as a sealing ring, so as to ensure the movement accuracy of the plunger 2 while preventing liquid leakage.

[0045] Optionally, each valve body 3 is a check valve. By installing check valves at each inlet and outlet, the normal flow of dialysate is ensured while preventing backflow of dialysate during the operation of the pump body 1, thereby improving the operating efficiency and safety of the dialysis equipment. In addition, each valve body 3 can also be a flow regulating valve, which can more accurately and stably control the fluid flow rate, thereby ensuring the efficient and safe operation of the plunger balancing device.

[0046] Furthermore, each check valve can be an electric check valve, which is connected to an external controller. The controller is connected to a flow meter and controls the opening and closing of the corresponding check valve according to the flow rate, thereby achieving automatic control of the dialysate flow rate.

[0047] This application also provides a dialysis device including the above-mentioned plunger balancing device, which has high precision and stable performance.

[0048] The plunger balancing device and dialysis equipment provided in this application have been described in detail above. Specific examples have been used to illustrate the principles and implementation methods of this application. The descriptions of the embodiments above are only for the purpose of helping to understand the method and core ideas of this application. It should be noted that those skilled in the art can make several improvements and modifications to this application without departing from the principles of this application, and these improvements and modifications also fall within the protection scope of the claims of this application.

Claims

1. A plunger balancing device, characterized in that, The pump body (1) includes a pump body (1) and a plunger (2). The pump body (1) has a cavity (11), and the plunger (2) is disposed in the cavity (11) and is slidably sealed to the cavity (11). The plunger (2) is used to divide the cavity (11) to form a first chamber (111) and a second chamber (112). The pump body (1) has a first inlet (113) and a first outlet (114) communicating with the first chamber (111), and a second inlet (115) and a second outlet (116) communicating with the second chamber (112). It also includes: Four valve bodies (3) are respectively disposed at the first liquid inlet (113), the first liquid outlet (114), the second liquid inlet (115) and the second liquid outlet (116). A linear actuator (4) is connected to the plunger (2) for driving the plunger (2) to move along the cavity (11).

2. The plunger balancing device according to claim 1, characterized in that, The inner wall of the pump body (1) is provided with a first ceramic layer, and the outer wall of the plunger (2) is provided with a second ceramic layer; or, The inner wall of the pump body (1) is provided with a ceramic layer, and the plunger (2) is a ceramic plunger.

3. The plunger balancing device according to claim 2, characterized in that, The plunger (2) forms a first chamber (111) and a second chamber (112) between its two end faces along the first direction and the cavity (11), respectively. The first chamber (111) and the second chamber (112) are respectively located on both sides of the plunger (2) along the first direction, and the volume of the first chamber (111) and the second chamber (112) is adjustable.

4. The plunger balancing device according to claim 1, characterized in that, Each of the valve bodies (3) is a one-way stop valve.

5. The plunger balancing device according to claim 4, characterized in that, The check valve is an electric check valve, and the electric check valve is connected to a controller.

6. The plunger balancing device according to claim 1, characterized in that, The linear actuator (4) includes a linear motor, or a piezoelectric actuator, or a ball screw, or a cylinder, or a hydraulic cylinder.

7. The plunger balancing device according to any one of claims 1 to 6, characterized in that, It also includes a connection assembly (5) connecting the linear actuator (4) and the plunger (2). The connection assembly (5) includes a first connector (51), a second connector (52) and a plurality of fasteners. The first connector (51) is connected to the linear actuator (4) via fasteners. The second connector (52) is fixed to the plunger (2) and is connected to the first connector (51) via the fasteners.

8. The plunger balancing device according to claim 7, characterized in that, The first liquid inlet (113) and the second liquid inlet (115) are respectively located on the upper part of the cavity (11), the first liquid outlet (114) and the second liquid outlet (116) are respectively located on the lower part of the cavity (11), the pump body (1) is provided with a sliding part distributed along the first direction, the second connecting member (52) passes through the sliding part and is connected to the plunger (2), and the outer peripheral surface of the plunger (2) is sealed to the inner wall of the pump body (1).

9. A dialysis device, characterized in that, Includes the plunger balancing device as described in any one of claims 1 to 8.

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