Centrifugal blood pump

Abstract

The utility model discloses a centrifugal blood pump which comprises a pump shell and an impeller, the pump shell is provided with a pump cavity and an outlet pipe connected to the pump cavity, the impeller is eccentrically arranged in the pump cavity, and a gap between the periphery of the impeller and the inner wall of the pump cavity is gradually increased in the rotating direction of the impeller. A spiral pumping chamber is formed between the periphery of the impeller and the inner wall of the pump cavity, and the large-size end of the pumping chamber leads to the outlet pipe. Through the arrangement of the spiral pumping chamber, when the impeller drives fluid to flow in the spiral direction of the pumping chamber, the flow speed of the fluid can be reduced, kinetic energy is converted into pressure energy, and therefore output pressure is increased, and the energy efficiency of the blood pump is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of medical equipment, in particular to a centrifugal blood pump. Background Art

[0002] A centrifugal blood pump is an artificial heart assist circulatory device, which is usually composed of a pump body, a rotor, a stator winding, an impeller, a bearing and other components. The pump body is the outer shell of the blood pump, and the rotor is the rotating component of the blood pump, which is used to drive the impeller to rotate and do work. The bearing is used to support the rotor. When the stator winding of the blood pump drives the rotor and impeller to rotate, blood is sucked into the pump body and pushed to the outlet of the pump body under the action of the centrifugal force of the impeller, thereby realizing blood circulation.

[0003] At present, the impeller and pump chamber of the existing blood pump are generally circular and concentrically distributed, and the gaps between the impeller and the inner wall of the pump chamber are of the same size. When the impeller rotates, the fluid generates kinetic energy and is pushed to the gap between the impeller and the inner wall of the pump chamber under the action of the centrifugal force of the impeller, and finally flows out from the blood pump outlet. Since the gaps between the impeller and the inner wall of the pump chamber are of the same size, the flow rate of the fluid in each gap is the same, and the pressure of the fluid in each gap is also the same, resulting in the inability to increase the output pressure and the energy efficiency of the blood pump needs to be improved. Therefore, it is necessary to improve the existing technology to overcome the defects in the existing technology. Utility Model Content

[0004] The problem to be solved by the utility model is to provide a centrifugal blood pump to overcome the defects of low fluid output pressure and low energy efficiency of the existing centrifugal blood pump.

[0005] The utility model adopts the following technical solution to solve its technical problems: a centrifugal blood pump, comprising: a pump casing and an impeller, the pump casing being provided with a pump chamber and an outlet pipe connected to the pump chamber, the impeller being eccentrically arranged in the pump chamber, and making the gap between the outer periphery of the impeller and the inner wall of the pump chamber gradually increase along the rotation direction of the impeller, thereby forming a spiral water pressure chamber between the outer periphery of the impeller and the inner wall of the pump chamber, and the larger end of the water pressure chamber leads to the outlet pipe.

[0006] As a further improvement of the utility model, the outlet pipe and the pump chamber are located on the same plane, and the extension line of the water pressure chamber can pass through the outlet pipe.

[0007] As a further improvement of the utility model, a conical diffusion channel is provided in the outlet pipe, and the inner diameter of the diffusion channel gradually increases from one end connected to the water pressure chamber toward the other end.

[0008] As a further improvement of the present invention, the slope of the conical surface of the diffusion channel is 5° to 15°.

[0009] As a further improvement of the present invention, the cross-section of the inner wall of the pump chamber is in a spiral shape.

[0010] As a further improvement of the utility model, the impeller includes a plurality of blades distributed in an annular array, and the cross sections of the plurality of blades are all in a spiral shape.

[0011] As a further improvement of the utility model, the impeller further includes an upper cover plate and a lower cover plate both of which are annular, and a plurality of blades are fixedly arranged between the upper cover plate and the lower cover plate.

[0012] As a further improvement of the present invention, the centrifugal blood pump further comprises a rotor, wherein the rotor is integrally connected to the top of the impeller, and the axis of the rotor coincides with the axis of the impeller.

[0013] As a further improvement of the utility model, the pump housing is further provided with an inlet pipe, the inlet pipe is vertically connected to the top of the pump chamber, and the rotor is inserted in the inlet pipe.

[0014] As a further improvement of the utility model, the centrifugal blood pump also includes a stator winding arranged outside the inlet pipe and a rotor magnet arranged inside the rotor, and the stator winding is used to drive the rotor and the impeller to rotate through the rotor magnet when power is supplied.

[0015] The beneficial effects of the utility model are as follows: the utility model provides a centrifugal blood pump, which arranges the impeller eccentrically in the pump chamber, and makes the gap between the outer periphery of the impeller and the inner wall of the pump chamber gradually increase along the rotation direction of the impeller, so that a spiral water pressure chamber is formed between the outer periphery of the impeller and the inner wall of the pump chamber. When the impeller rotates, the fluid is sucked into the pump chamber and generates kinetic energy under the action of the impeller. The impeller pushes the fluid into the water pressure chamber between the outer periphery of the impeller and the inner wall of the pump chamber. Since the water pressure chamber is a spiral structure, its size gradually increases along the rotation direction of the impeller. When the impeller drives the fluid to flow along the spiral direction of the water pressure chamber, the flow rate of the fluid will be reduced, and the kinetic energy will be converted into pressure energy, thereby increasing the output pressure and improving the energy efficiency of the blood pump; at the same time, a tapered diffusion channel is provided in the outlet pipe. When the fluid flows outward along the diffusion channel, the flow rate of the fluid can be further reduced, the kinetic energy can be converted into pressure energy, and the output pressure can be further increased. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a longitudinal cross-sectional view of the centrifugal blood pump of the utility model;

[0017] Figure 2 It is a transverse cross-sectional view of the centrifugal blood pump of the utility model;

[0018] Figure 3 It is a three-dimensional diagram of the rotor and impeller of the centrifugal blood pump of the utility model;

[0019] Figure 4 This is an exploded view of the pump casing of the centrifugal blood pump of the utility model.

[0020] Combined with the attached drawings, the following description is given:

[0021] 1. Pump housing; 101. Pump chamber; 102. Outlet pipe; 1021. Diffusion channel;

[0022] 103, water pressure chamber; 104, inlet pipe; 2, impeller; 201, blades; 202, upper cover plate; 203, lower cover plate; 3, rotor; 4, stator winding; 5, rotor magnet. DETAILED DESCRIPTION

[0023] The preferred embodiments of the present invention are described in detail below in conjunction with the accompanying drawings.

[0024] See also Figures 1 to 4 The utility model provides a centrifugal blood pump, comprising: a pump housing 1 and an impeller 2. The pump housing 1 is provided with a pump chamber 101 and an outlet pipe 102 connected to the pump chamber 101, the impeller 2 is eccentrically arranged in the pump chamber 101, and the gap between the outer periphery of the impeller 2 and the inner wall of the pump chamber 101 is gradually increased along the rotation direction of the impeller 2, so that a spiral water pressure chamber 103 is formed between the outer periphery of the impeller 2 and the inner wall of the pump chamber 101, and the larger end of the water pressure chamber 103 leads to the outlet pipe 102.

[0025] When the impeller 2 rotates, the fluid is sucked into the pump chamber 101 and generates kinetic energy under the action of the impeller 2. The impeller 2 pushes the fluid into the water pressure chamber 103 between the outer periphery of the impeller 2 and the inner wall of the pump chamber 101. Since the water pressure chamber 103 is a spiral structure, its size gradually increases along the rotation direction of the impeller 2. When the impeller 2 drives the fluid to flow along the spiral direction of the water pressure chamber 103, the flow rate of the fluid will be reduced, and the kinetic energy will be converted into pressure energy, thereby increasing the output pressure and improving the energy efficiency of the blood pump.

[0026] In this embodiment, the pump chamber 101 is not circular but has a spiral structure. To be more precise, the cross-section of the inner wall of the pump chamber 101 is spiral. In this way, the impeller 2 is eccentrically arranged in the pump chamber 101, so that a spiral water pressure chamber 103 can be formed between the outer periphery of the impeller 2 and the inner wall of the pump chamber 101.

[0027] In this embodiment, the outlet pipe 102 and the pump chamber 101 are on the same plane, and the extension line of the water pressure chamber 103 along its spiral direction can pass through the outlet pipe 102, so that the fluid can flow directly to the outlet pipe 102 along the spiral direction of the water pressure chamber 103, reducing resistance.

[0028] like Figure 2As shown, a conical diffusion channel 1021 is provided in the outlet pipe 102, and the inner diameter of the diffusion channel 1021 gradually increases from one end connected to the pressure chamber 103 toward the other end. Similarly, by providing the conical diffusion channel 1021, when the fluid flows outward along the diffusion channel 1021, the flow rate of the fluid can be further reduced, and the kinetic energy can be converted into pressure energy, and the output pressure can be further increased, so that the medium flowing through the pump is pressurized and pushed into the output pipeline connected to the outlet pipe 102.

[0029] Exemplarily, the slope of the cone surface of the diffusion channel 1021 (ie, the angle between the generatrix of the cone formed by the inner wall of the diffusion channel 1021 and the center line thereof) is 5° to 15°, preferably 8°.

[0030] See also Figure 3 The impeller 2 includes a plurality of blades 201, an upper cover plate 202 and a lower cover plate 203. The plurality of blades 201 are distributed in an annular array and are fixedly disposed between the upper cover plate 202 and the lower cover plate 203.

[0031] In this embodiment, each blade 201 extends in the vertical direction, and its cross section is in the shape of a spiral line, or more precisely, is taken from a certain section of the spiral line. The blade 201 with this shape can more effectively throw out the fluid when rotating.

[0032] Furthermore, the upper cover plate 202 and the lower cover plate 203 are both in the shape of a circular ring. The through hole in the middle of the upper cover plate 202 facilitates the fluid to enter between the blades 201 from the inlet pipe 104 of the blood pump, and the through hole of the lower cover plate 203 is used to allow the fluid between the lower cover plate 203 and the bottom of the pump chamber 101 to return to between the blades 201. The utility model adopts this closed structure of the impeller 2, so that the impeller 2 can generate axial hydraulic power when rotating, so that the impeller 2 can be axially suspended.

[0033] See also Figure 4 The pump housing 1 in this embodiment includes a pump lower chamber and a pump upper cover, and the pump lower chamber and the pump upper cover can be fixedly and sealedly connected by bolts. The pump chamber 101 is formed by the pump lower chamber and the pump upper cover. The pump lower chamber and the pump upper cover are both integrally provided with a semicircular tube portion. When the pump lower chamber and the pump upper cover are assembled, the two semicircular tube portions are assembled to form an outlet pipe 102.

[0034] In addition, the centrifugal blood pump of the utility model further includes a rotor 3, a stator winding 4 and a rotor magnet 5. The rotor 3 is integrally connected to the top of the impeller 2, and the axis of the rotor 3 coincides with the axis of the impeller 2. The inlet pipe 104 of the blood pump is integrally connected to the top of the pump cover of the pump housing 1, and the inlet pipe 104 is vertically distributed with the pump chamber 101, and the rotor 3 is inserted in the inlet pipe 104.

[0035] Furthermore, the pump casing 1 also includes an outer tube sleeved on the outside of the inlet pipe 104, the stator winding 4 is fixed between the inlet pipe 104 and the outer tube, the rotor magnet 5 is fixed in the rotor 3, and the rotor magnet 5 is located in the middle of the stator winding 4, and the stator winding 4 is used to drive the rotor 3 and the impeller 2 to rotate through the rotor magnet 5 when power is supplied.

[0036] In addition to the above components, the centrifugal blood pump of the utility model can also be provided with several groups of magnetic bearings or electromagnetic bearings to ensure the radial and axial suspension effect of the rotor 3 and the impeller 2. Among them, the magnetic bearings or electromagnetic bearings are both existing technologies and will not be described in detail here.

[0037] It can be seen that the centrifugal blood pump of the utility model adopts the method of eccentrically arranging the impeller 2 in the pump chamber 101, and making the gap between the outer periphery of the impeller 2 and the inner wall of the pump chamber 101 gradually increase along the rotation direction of the impeller 2, so as to form a spiral water pressure chamber 103 between the outer periphery of the impeller 2 and the inner wall of the pump chamber 101. When the impeller 2 rotates, the fluid is sucked into the pump chamber 101 and generates kinetic energy under the action of the impeller 2. The impeller 2 pushes the fluid into the water pressure chamber 103 between the outer periphery of the impeller 2 and the inner wall of the pump chamber 101. Due to the pressure The water chamber 103 is a spiral structure, and its size gradually increases along the rotation direction of the impeller 2. When the impeller 2 drives the fluid to flow along the spiral direction of the water pressure chamber 103, the flow rate of the fluid will be reduced, and the kinetic energy will be converted into pressure energy, thereby increasing the output pressure and improving the energy efficiency of the blood pump; at the same time, a conical diffusion channel 1021 is provided in the outlet pipe 102. When the fluid flows outward along the diffusion channel 1021, the flow rate of the fluid can be further reduced, and the kinetic energy can be converted into pressure energy, thereby further increasing the output pressure.

[0038] In the above description, many specific details are described to facilitate a full understanding of the present invention. However, the above description is only a preferred embodiment of the present invention. The present invention can be implemented in many other ways different from those described herein, so the present invention is not limited by the specific implementation disclosed above. At the same time, any person familiar with the technical field can make many possible changes and modifications to the technical solution of the present invention by using the methods and technical contents disclosed above without departing from the scope of the technical solution of the present invention, or modify it into an equivalent embodiment of equivalent changes. Any simple modification, equivalent change and modification made to the above embodiments based on the technical essence of the present invention without departing from the content of the technical solution of the present invention still falls within the scope of protection of the technical solution of the present invention.

Claims

1. A centrifugal blood pump, comprising a pump housing (1) and an impeller (2), wherein the pump housing (1) is provided with a pump chamber (101) and an outlet pipe (102) connected to the pump chamber (101), characterized in that: The impeller (2) is eccentrically arranged in the pump chamber (101), and the gap between the outer periphery of the impeller (2) and the inner wall of the pump chamber (101) is gradually increased along the rotation direction of the impeller (2), thereby forming a spiral water pressure chamber (103) between the outer periphery of the impeller (2) and the inner wall of the pump chamber (101), and the larger end of the water pressure chamber (103) leads to the outlet pipe (102).

2. The centrifugal blood pump according to claim 1, characterized in that: The outlet pipe (102) and the pump chamber (101) are located on the same plane, and an extension line of the water pressure chamber (103) can pass through the outlet pipe (102).

3. The centrifugal blood pump according to claim 1, characterized in that: A conical diffusion channel (1021) is provided in the outlet pipe (102), and the inner diameter of the diffusion channel (1021) gradually increases from one end connected to the water pressure chamber (103) toward the other end.

4. The centrifugal blood pump according to claim 3, characterized in that: The conical surface slope of the diffusion channel (1021) is 5° to 15°.

5. The centrifugal blood pump according to claim 1, characterized in that: The cross section of the inner wall of the pump chamber (101) is in the shape of a spiral line.

6. The centrifugal blood pump according to claim 1, characterized in that: The impeller (2) comprises a plurality of blades (201) distributed in a ring array, and the cross sections of the plurality of blades (201) are all in the shape of a spiral line.

7. The centrifugal blood pump according to claim 6, characterized in that: The impeller (2) further comprises an upper cover plate (202) and a lower cover plate (203) both of which are annular, and a plurality of blades (201) are fixedly arranged between the upper cover plate (202) and the lower cover plate (203).

8. The centrifugal blood pump according to claim 1, characterized in that: It also comprises a rotor (3), wherein the rotor (3) is integrally connected to the top of the impeller (2), and the axis of the rotor (3) coincides with the axis of the impeller (2).

9. The centrifugal blood pump according to claim 8, characterized in that: The pump housing (1) is also provided with an inlet pipe (104), the inlet pipe (104) is vertically connected to the top of the pump chamber (101), and the rotor (3) is inserted into the inlet pipe (104).

10. The centrifugal blood pump according to claim 9, characterized in that: It also includes a stator winding (4) arranged outside the inlet pipe (104) and a rotor magnet (5) arranged inside the rotor (3); the stator winding (4) is used to drive the rotor (3) and the impeller (2) to rotate through the rotor magnet (5) when power is supplied.

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