Motor and blood pump

Abstract

The invention discloses a motor and a blood pump. The motor comprises a shell; the motor is arranged in the shell; the motor driving and controlling assembly is arranged in the shell, located on the periphery of the motor and used for controlling operation of the motor; the motor drive control assembly comprises at least one target circuit board, axial movement of the clamping piece relative to the shell can be converted into relative radial movement, and the target circuit board located between the clamping piece and the shell is attached to the shell by means of the radial movement of the clamping piece.

Description

Technical Field

[0001] The present disclosure relates to the field of medical devices, and in particular to a motor and a blood pump. Background Art

[0002] In the case where the heart loses its pumping function (such as heart arrest surgery, acute cardiogenic shock, etc.), a blood pump can be used to replace the heart to assist in maintaining human blood circulation. According to implantability and clinical use, blood pumps can be divided into implantable blood pumps and extracorporeal blood pumps. Implantable blood pumps can be implanted into the patient's body to temporarily or long-term maintain human blood circulation. They are mainly used for transplant replacement therapy for patients with end-stage heart failure. Extracorporeal blood pumps can be used outside the body to provide transitional life support and treatment with less trauma.

[0003] Extracorporeal blood pumps are equipped with a motor control assembly for controlling the motor. This motor control assembly generates a significant amount of heat during operation. Typically, the motor control assembly and the motor are housed within the motor and filled with potting compound to dissipate heat. However, for some motor control assemblies that generate significant heat, the potting compound cannot adequately dissipate this heat. Therefore, the optimal arrangement of the motor control assembly within the housing to dissipate this heat has long been a concern in the field. Summary of the Invention

[0004] In the process of solving the above problems, the inventors of this application further discovered the following problems: Typically, the motor drive control assembly is secured within the motor housing with potting compound, which then dissipates heat. The essence of potting compound heat dissipation is still to transfer heat to the housing. However, practice has shown that potting compound cannot meet the required heat dissipation requirements when the motor drive control assembly generates high heat.

[0005] Furthermore, when the motor drive control components are deployed in segments, each circuit board has different power requirements due to the different electronic components deployed. Generally, among all the circuit board sections, one section has a higher power requirement. For this higher power circuit board, potting compound has a greater difficulty meeting its heat dissipation requirements.

[0006] Circuit boards that use potting compound to dissipate heat can be pre-installed on the motor housing using screws. After the motor, carrying the motor drive components, is implanted in the motor housing, the potting compound fills the space between these circuit board sections and the inner wall of the housing. However, this pre-installation method of screw fastening is not suitable for circuit boards that generate a lot of heat. This is because these circuit boards either have a higher density of electronic components or contain electronic components that far exceed the power of other circuit boards. If this method is used to install a circuit board that generates a lot of heat, the scattered screws will apply multiple points of force to the circuit board, resulting in uneven force and potentially damaging the electronic components.

[0007] Therefore, it's common practice to pre-fasten the lower-power circuit board to the inner wall of the motor housing first, then place the motor inside the motor housing, and finally secure the higher-power circuit board. However, once the motor drive control assembly is placed in the housing, the operating space becomes smaller, restricting access. Therefore, securing at least some of the unsecured circuit boards after the motor drive control assembly is placed in the motor housing is a pressing technical challenge.

[0008] In view of the deficiencies of the prior art, the present disclosure provides a motor and a blood pump that can solve the problems of heat dissipation and fixation of a circuit board in a narrow motor operating space.

[0009] To achieve the above objectives, the present invention provides the following technical solutions.

[0010] A motor comprises: a housing; a motor disposed within the housing; a motor drive control assembly disposed within the housing and located on the periphery of the motor, for controlling the operation of the motor; the motor drive control assembly comprises at least one target circuit board, wherein the axial movement of the clamp relative to the housing can be converted into relative radial movement, and with the aid of the radial movement of the clamp, the target circuit board located between the clamp and the housing is adhered to the housing.

[0011] A blood pump comprises: a pump head comprising at least an impeller; and a motor as described above, engaged with the pump head, for driving the impeller.

[0012] By setting up a clamping piece, the target circuit board with integrated motor drive control components can be clamped to fit against the inner wall of the motor housing. The heat generated by the circuit board can be directly transferred to the motor housing and dissipated through the housing, resulting in better heat dissipation effect.

[0013] Furthermore, axial operating space is provided when installing the circuit board into the housing. The fastener receives operating force at its end, driving the clamping member to move radially within the housing. This means that axial operation of the fastener results in radial movement of the clamping member. The fastener then removably secures the clamping member to the inner wall of the housing while simultaneously pressing the circuit board against the inner wall, thereby achieving the goal of manipulating and securing the circuit board in a confined space. Furthermore, by using the clamping member to compress the circuit board, force is applied more evenly than with multiple screws, preventing damage to electronic components on the circuit board. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 This is an exploded diagram of part of the motor structure; Figure 2 yes Figure 1 Schematic diagram of the structure of the middle clamping member; Figure 3This is a partial cross-sectional view of the clamping member mounting the motor drive control assembly on the housing. DETAILED DESCRIPTION

[0015] The blood pump of this embodiment includes a pump head and a motor, and the pump head includes a pump casing and an impeller. The pump head is detachably connected to the motor, wherein the impeller can be driven by the motor to pump blood. In one embodiment, the motor can be a magnetic levitation motor, and the impeller in the pump head can be suspended in the pump casing by means of the magnetic bearing provided by CN111561519A or CN114748788A, and the blood pump corresponds to an extracorporeal magnetic levitation blood pump. Although the following text introduces the magnetic levitation blood pump and motor as the main scenario, it should be understood that the fixing scheme of the motor drive control assembly of this embodiment is also applicable to motors of other types of blood pumps, such as the motor of a hydraulically suspended blood pump, the motor of a mechanical bearing blood pump, the motor of an implantable blood pump, etc.

[0016] like Figure 1 As shown, the motor includes a housing 1, a motor (not shown) and a motor drive control component 2 arranged in the housing 1. The motor is a magnetic levitation motor drive control component 2, wherein the motor drive control component 2 is used to control the operation of the motor, which is integrated on a circuit board. In actual applications, there are multiple circuit boards to facilitate the arrangement of electronic components with different functions. Of course, the different circuit boards electrically connected to each other can adjust the relative positions and installation positions according to the internal space of the housing 1 to save the volume of the housing 1. Since different circuit boards have different heating powers, their corresponding heat dissipation requirements are also different. Among them, there is a circuit board 21 with less heat generation, which can be transferred to the housing 1 through a potting compound with a heat dissipation function or directly with the help of air. The installation requirements of this type of circuit board are relatively low. It can be installed on the motor housing and then placed in the housing 1 together with the motor. The heat is dissipated by potting compound or air. This type of circuit board considers the problem of easy assembly more. There is another circuit board with a higher heat generation (hereinafter referred to as the target circuit board 22). The potting glue or air can no longer meet its heat dissipation needs. This requires reducing its heat transfer path and trying to fit this type of circuit board to the inner wall 11 of the shell 1. Therefore, the installation requirements of this type of circuit board are relatively high and it cannot be installed along with the assembly of the motor. Therefore, a special mounting structure is required to fit this type of circuit board to the shell 1.

[0017] like Figure 3 As shown, the target circuit board 22 can be clamped by the clamping member 4 to fit the inner wall 11 of the housing 1. The clamping member 4 is detachably fixed to the inner wall 11 of the housing 1 by the fastener 5. The clamping member 4 makes the circuit board close to the inner wall 11 of the housing 1, which can avoid air gaps between the circuit board and the housing 1. The heat generated by the circuit board is transferred to the housing 1 and further dissipated outward, achieving a better heat dissipation effect.

[0018] When installing the circuit board, the housing 1 is axially open, meaning it has an open space along the axial direction. This open space provides axial clearance for operation. In this case, the circuit board 21 (which generates less heat) can be pre-fastened to the motor housing and then placed into the housing 1 along with the motor. Since the remaining clearance is limited and the operation is restricted, the target circuit board 22 can simply be secured to the inner wall 11 of the housing 1 using the clamps 4.

[0019] The target circuit board 22 can be one or more, such as two or three (for example, when the heat generated by two or more circuit boards is equal to and greater than the heat generated by other circuit boards, the two or more circuit boards can serve as target circuit boards at the same time). In this case, multiple clamps 4 are required to ensure that the multiple target circuit boards 22 are all attached to the inner wall 11 of the shell 1.

[0020] The fastener 5 has an end 51. When the fastener 5 receives operating power at its end 51 and is secured to the inner wall 11 of the housing 1, the clamping member 4 is driven to move radially within the housing 1. In other words, axial operation of the fastener 5 causes radial movement of the clamping member 4, thereby pressing the circuit board against the inner wall 11 of the housing 1. In this manner, the fastener 5 removably secures the clamping member 4 to the inner wall 11 of the housing 1 while the clamping member 4 presses the circuit board against the inner wall 11 of the housing 1. This allows the circuit board to be secured to the inner wall 11 of the housing 1 in a confined space, allowing heat generated by the circuit board to be dissipated into the air through the inner wall 11.

[0021] Furthermore, the clamping member 4 is in surface contact with the circuit board, so when the clamping member 4 presses the circuit board, the force is applied more evenly than by tightening screws at multiple points, and the electronic components on the circuit board will not be damaged.

[0022] In particular, the circuit board of the motor drive control assembly 2, which is clamped by the clamping member 4 to fit the inner wall 11 of the housing 1, is the circuit board with the highest component heat generation among all the circuit boards. The highest heat generation means that the total power of the electronic components on the circuit board is the highest.

[0023] A flexible thermally conductive member 6 is disposed between the target circuit board 22 and the inner wall 11 of the housing 1. This member 6 is flexible and has excellent thermal conductivity, such as thermally conductive silicone. The thermally conductive member 6 prevents the target circuit board 22 from directly contacting the rigid inner wall 11 of the housing 1, thereby providing a buffer and protective effect for the electronic components on the target circuit board 22. Furthermore, it eliminates air gaps between the target circuit board 22 and the inner wall 11 of the housing 1 that might otherwise result from uneven surfaces in the mating relationship, thereby improving the heat dissipation efficiency of the target circuit board 22.

[0024] like Figures 1 to 3As shown, the clamping member 4 is generally L-shaped and includes a first sub-body 41 that is detachably connected to the inner wall 11 of the housing 1 and a second sub-body 42 for pressing the target circuit board 22 toward the inner wall 11 of the housing 1. The first sub-body 41 and the second sub-body 42 are preferably integrally formed, and are arranged at approximately right angles. When the clamping member 4 is mounted in conjunction with the inner wall 11 of the housing 1, the first sub-body 41 moves axially along the housing 1 under the action of the fastener 5, while the second sub-body 42 moves radially along the housing 1 with the aid of the radial force component of the fastener 5. The radial force component of the fastener 5 is generated because the first sub-body 41 and the inner wall 11 of the housing 1 are beveled together. This beveled fit allows the first sub-body 41 to be fixed axially by the fastener 5 in the housing 1, while the second sub-body 42 moves radially along the housing 1, thereby clamping the target circuit board 22 located between the second sub-body 42 and the inner wall 11.

[0025] like Figure 3 As shown, the first split body 41 extends from the free end to the fixed end, wherein the fixed end is the junction between the first split body 41 and the second split body 42. Specifically, the free end of the first split body 41 extends downward in multiple steps toward the fixed end, and the step surfaces are connected by inclined surfaces. The first step 411 is located at the free end of the first split body 41, the second step 414 is roughly located in the middle of the first split body 41, and the third step 415 is located at the fixed end of the first split body 41. The first step 411 and the second step 414 are connected by a first transition surface 412, and the angle between the first transition surface and the second step is greater than or equal to a right angle. Preferably, the first transition surface 412 is greater than a right angle, and the axial movement of the first split body 41 is achieved by the cooperation and relative movement of the first transition surface 412 with the inclined surface of the inner wall 11. The second step 414 and the third step 415 are connected by a second transition surface (not shown in the figure). The angle between the second transition surface and the third step 415 is greater than or equal to a right angle. When the target circuit board 22 is in close contact with the second split body 42, the third step 415 and the second transition surface are used to provide axial avoidance for the target circuit board 22, preventing the target circuit board 22 from being bumped by the first split body 41.

[0026] The inner wall 11 of the housing 1 has a radially extending boss 7 formed thereon for removably connecting to the clamp 4. A groove 71 is formed on the axially lower surface of the boss 7. The sidewall of the groove 71 where it contacts the first transition surface 412 is an inclined surface 711. The first step 411 fits into the groove 71, and the first transition surface 412 and the inclined surface 711 slide in relative engagement.

[0027] Preferably, the opposing surfaces of the second body 42 and the boss 7 are approximately parallel. This maximizes the contact area between the two parallel surfaces, thereby achieving better heat dissipation for the target circuit board 22 and preventing uneven force applied by the second body 42 to the target circuit board 22 due to non-parallelism. "Approximately parallel" means that the angle between the two surfaces is between 0 and 10 degrees. Because a flexible thermal conductor 6 is positioned between the second body 42 and the boss 7, deformation of the thermal conductor 6 within this predetermined angle range can compensate for uneven force applied to the target circuit board 22.

[0028] Preferably, the first split body 41 is provided with a mounting hole 413 for the fastener 5 to pass through, thereby securing the clamp 4 to the boss 7. The inner diameter of the mounting hole 413 is larger than the outer diameter of the fastener 5, meaning that the fastener has radial play relative to the mounting hole, and this play is sufficient to accommodate the relative movement between the first transition surface 412 and the inclined surface 711, so that when the inclined surface cooperates to drive the clamp 4 to move, the fastener 5 does not block the movement of the clamp 4. The fastener 5 is a screw or bolt that is threadedly engaged with the boss 7 of the housing 1, thereby causing the second split body 42 to move radially when the fastener 5 is tightened to secure it to the housing 1. By combining the inner diameter of the mounting hole 413 with the first transition surface 412 and the inclined surface 711, the axial displacement of the clamp 4 is converted into radial displacement, thereby clamping the target circuit board 22 located between the boss 7 and the second split body 42.

[0029] In other embodiments, at least one circuit board is fixed to the motor, which can be fixed by fastening components such as screws. The heat generation or power of the components of the circuit board fixed to the motor housing is less than the heat generation or power of the components of the target circuit board 22 attached to the inner wall 11 of the shell 1. In this way, these circuit boards with less heat generation can be fastened to the motor housing with screws in advance, and then the motor together with the drive assembly can be placed in the operating space of the shell 1. Since the remaining operating space is small and the operation is limited at this time, it is only necessary to attach and fix the target circuit board 22 with a larger heat generation to the inner wall 11 of the shell 1 using the embodiment of the present invention. Before the motor is installed in the shell 1, the circuit board with less heat generation is fixed to the motor in advance, that is, this part of the circuit board motor does not need to be fixed in the shell 1 later, which can reduce the number of circuit boards that need to be fixed in the shell 1, thereby improving the assembly efficiency of the motor.

[0030] Preferably, potting compound (not shown) is placed between the circuit boards secured to the motor housing and the housing 1 to dissipate heat from these circuit boards, which generate less heat. Potting compound has excellent thermal conductivity and can be used to fill the interior of the motor housing. In contrast, the target circuit board 22 generates a greater amount of heat, and potting compound cannot meet its heat dissipation requirements. Consequently, the heat generated by the target circuit board 22 is transferred to the inner wall 11 of the housing 1 and dissipated through the housing 1.

[0031] In this way, the motor drive control component 2 includes multiple circuit boards with different heat generation, and different heat dissipation solutions are configured according to the different heat generation to ensure that the heat of the motor drive control component 2 can be dissipated efficiently while taking into account the assembly efficiency of the motor.

[0032] The exemplary embodiments of the present disclosure have been described above with reference to the accompanying drawings. However, it should be understood by those skilled in the art that the present disclosure is not limited to the specific configurations disclosed. Various changes and modifications may be made to the exemplary embodiments of the present disclosure without departing from the spirit and scope of the present disclosure. All such changes and modifications are intended to be within the scope of protection defined by the claims of the present disclosure.

Claims

1. A motor comprising: case; a motor, disposed in the housing; A motor drive control assembly is provided in the housing and located on the periphery of the motor, and is used to control the operation of the motor; the motor drive control assembly includes at least one target circuit board, and the axial movement of the clamping member relative to the housing can be converted into relative radial movement. With the help of the radial movement of the clamping member, the target circuit board located between the clamping member and the housing is adhered to the housing.

2. The motor according to claim 1, wherein the clamping member comprises: A first split body detachably connected to the housing in the axial direction, and a second split body for pressing the circuit board radially toward the housing, wherein a predetermined angle is formed between the first split body and the second split body.

3. The motor as described in claim 2, wherein the first split body and the shell are matched with each other on an inclined surface, and the matching of the inclined surfaces enables the second split body to move radially closer to the shell when the first split body is axially fixed to the shell to clamp the circuit board between the two.

4. The motor according to claim 2, wherein the free end of the first split body extends downward in multiple steps toward the fixed end, and the steps are connected by inclined surfaces.

5. The motor as described in claim 4, wherein a first step is provided at the free end of the first split body, a second step is provided at the substantially middle portion of the first split body, the first step and the second step are connected by a first transition surface, and an angle between the first transition surface and the second step is greater than or equal to a right angle.

6. The motor according to claim 5, wherein a third step is provided at the fixed end of the first split body, the second step and the third step are connected by a second transition surface, and an angle between the second transition surface and the third step is greater than or equal to a right angle.

7. The motor according to claim 2, wherein the first split body is provided with a mounting hole in the axial direction for fastening a fastener to the housing, and the fastener has a radial margin of movement relative to the mounting hole.

8. The motor according to claim 5, wherein the inner wall of the housing is provided with a boss for cooperating with the clamping member in the radial direction, the boss forms a groove on the axial lower surface, and the side wall surface of the groove that is relatively movable with the first transition surface is an inclined surface. 9 . The motor according to claim 8 , wherein the second split body is in surface contact with the target circuit board, and opposing surfaces of the second split body and the boss are substantially parallel to each other.

10. The motor according to claim 7, wherein the fastener has an end head, and when the fastener receives operating power at the end head, the clamping member is driven to have a component of radial movement in the housing to press the target circuit board to the housing. 11 . The motor according to claim 1 , wherein a flexible heat conductive member is provided between the target circuit board clamped by the clamping member to be attached to the housing and an inner wall of the housing.

12. The motor according to claim 1, wherein the motor drive control assembly further comprises at least one circuit board for being directly fixed to the motor, wherein the circuit board directly fixed to the motor generates less heat than the target circuit board.

13. The motor according to claim 12, wherein a potting compound is filled between the circuit board directly fixed to the motor and the housing.

14. A blood pump comprising: a pump head, including at least an impeller; The motor engaged with the pump head according to any one of claims 1 to 13 is used to drive the impeller.

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