Glue filling tool and glue filling method for motor

Abstract

The application relates to a glue filling tool and a glue filling method for a motor, which are suitable for glue filling of a motor of a blood pump. The motor comprises a motor shell and a stator arranged in the motor shell. The motor shell has a first end and a second end. The second end is provided with an opening. The glue filling tool comprises a base, a first fixing member, a shell and an axial positioning assembly. The base is provided with a mounting groove and a mandrel. The first fixing member is provided with a first positioning hole for nested cooperation with the outer circumferential surface of the first end. The first fixing member can be connected with the base to fix the first end in the mounting groove. The shell covers the first fixing member. The upper end of the shell is provided with a second positioning hole. The lower end of the shell can be connected with the base to fix the second end on the base. The axial positioning assembly is detachably mounted on the top of the shell and can be inserted into the top end of the mandrel.

Description

Technical Field

[0001] This application relates to the field of motor potting technology, and in particular to a potting fixture and a potting method for motors. Background Technology

[0002] In related technologies, the motor of an interventional blood pump (hereinafter referred to as a blood pump) includes a motor housing and components such as a stator, rotor, and shaft housed within the motor housing. During the manufacturing of this motor, the stator is typically assembled into the motor housing first, and then adhesive is injected into the gap between the inner wall of the motor housing and the stator to fix and seal the stator. However, the motor size of a blood pump is very small, making conventional adhesive injection fixtures difficult to apply for injecting adhesive into the motor of this type of blood pump. Therefore, there is an urgent need for a fixture that can be used for injecting adhesive into the motor of a blood pump. Summary of the Invention

[0003] Based on this, this application provides a potting fixture and a potting method for a motor, which is intended to be applied to potting the motor of a blood pump and to improve the coaxial accuracy of the stator and shaft assembly of the motor.

[0004] In one embodiment, the dispensing fixture is suitable for dispensing adhesive into the motor of a blood pump. The motor includes a motor housing and a stator disposed within the motor housing. The motor housing has a first end and a second end, the second end having an opening. The dispensing fixture includes: a base, the base having a mounting groove and a mandrel, the mounting groove for inserting the first end, and the mandrel disposed in the mounting groove for the stator of the motor to pass through; a first fixing member, the first fixing member having a first positioning hole for nesting with the outer peripheral surface of the first end, the first fixing member being able to connect with the base to fix the first end in the mounting groove; a housing, the upper end of the housing having a second positioning hole for nesting with the outer peripheral surface of the second end, the housing covering the first fixing member and being able to connect with the base to fix the second end on the base; and an axial positioning assembly, the axial positioning assembly being detachably installed on the top of the housing and being able to insert with the top end of the mandrel.

[0005] In one embodiment, the outer casing includes a sleeve and a second fixing member; wherein the sleeve has a first cavity and a second cavity, the first cavity being nested with the outer peripheral surface of the first fixing member; a radial stepped surface is provided between the second cavity and the first cavity; the second fixing member is mounted on the radial stepped surface; a second positioning hole is provided on the second fixing member, and the diameter of the second positioning hole is smaller than the diameter of the second cavity.

[0006] In one embodiment, the second fixing member and the first fixing member are spaced apart along the axial direction of the mandrel to form a partition cavity; at least one of the first fixing member and the base is provided with an airflow channel communicating with the mounting groove, and the sleeve is provided with an air hole, which communicates with the partition cavity and the airflow channel.

[0007] In one embodiment, the base includes a chassis and a boss disposed on the chassis, the boss having the mounting groove; the first fixing member is mounted on the boss; the inner wall surface of the first cavity of the sleeve is fitted with the outer peripheral surface of the boss.

[0008] In one embodiment, the mounting groove includes a bottom surface and a side surface; wherein the bottom surface is configured as a plane to be flush with and fit against the end face of the first end; and / or, the diameter of the mounting groove is larger than the diameter of the motor, so that the side surface of the mounting groove is spaced apart from the outer peripheral surface of the first end to form a gap.

[0009] In one embodiment, the axial positioning assembly includes a positioning block and a top post; wherein the positioning block is detachably connected to the housing, the positioning block has a pressure surface and a first directional hole, the first directional hole penetrating the pressure surface for insertion of the mandrel; the top post has a first end face, a second end face, and a second directional hole; wherein the second directional hole is coaxially arranged with the first directional hole and penetrates the first end face and the second end face for passage of the mandrel; the first end face can abut against the pressure surface, and the second end face can be inserted into the opening to abut against the top surface of the stator.

[0010] In one embodiment, the positioning block has a wire outlet hole through which the motor wires pass outward. The wire outlet hole is semi-circular, such that the wall of the wire outlet hole has a flat wall parallel to the axial direction of the mandrel, and an arc-shaped wall surrounding the mandrel and connecting the two ends of the flat wall. The flat wall has a directional post extending along the axial direction of the mandrel, and the first directional hole is disposed on the directional post and is tangent to the flat wall.

[0011] In one embodiment, the first end of the motor housing is the far end of the motor, and a detection port for sensor detection is provided on the side wall of the first end. An embedded part extending along the axial direction of the motor is pre-embedded inside the motor. The embedded part is used to form an installation channel for the sensor to pass through. One end of the embedded tube extends outward from the detection port. At least one of the mounting groove and the first fixing member has a clearance groove on its side wall, which allows the embedded part to extend out.

[0012] In one embodiment, the bottom wall of the base is provided with a groove, and a connecting hole is provided through the bottom of the groove near the upper surface of the base. The lower end of the outer shell is provided with a mating hole, and the mating hole and the connecting hole are connected by a fastener. The groove and the connecting hole are both arc-shaped along the circumference of the base so that the mating hole can correspond to any position of the connecting hole and the fastener can be inserted.

[0013] This application also provides a method for potting an electric motor, wherein the motor is a blood pump motor, and the method for potting the motor stator includes:

[0014] The dispensing fixture is provided, wherein the base, first fixing member, outer shell and axial positioning assembly of the dispensing fixture are in an unconnected state;

[0015] The motor is threaded onto the spindle of the base, and the first end of the motor is inserted into the mounting slot of the base;

[0016] The first positioning hole of the first fixing member passes through the second end of the motor to nest and engage with the outer peripheral surface of the first end of the motor, and the first fixing member is connected and fixed to the base;

[0017] The outer casing is placed over the base, and the second positioning hole of the outer casing passes through the second end of the motor and is nested with the outer peripheral surface of the second end of the motor.

[0018] Inject adhesive into the gap between the stator and the motor housing through the opening at the second end of the motor, and then draw a vacuum to fill the gap with adhesive.

[0019] The axial positioning assembly is installed on the top of the housing and inserted into the top of the spindle to calibrate the coaxiality of the motor housing, the stator and the spindle.

[0020] As can be seen from the above description, the dispensing fixture of this application can first fix the first end of the motor through the first fixing component, which can fine-tune the fit between the first end of the motor and the bottom surface of the mounting groove, improving the coaxial position of the stator and the spindle. Then, the second end of the motor is fixed through the housing, ensuring that the entire motor is vertically fixed on the base, further strengthening the coaxiality of the stator and the spindle, making their coaxiality even higher. It is evident that the dispensing fixture of this application has a relatively simple structure, and all components are nested and fixed to the motor, making operation relatively simple. After the adhesive solidifies, the spindle is withdrawn from the stator of the motor, thereby forming a shaft hole in the central area of ​​the stator, which is used to install the motor shaft. Therefore, when the motor is dispensed using the dispensing fixture of this application, and the shaft is then installed, the coaxiality accuracy of the shaft with the stator and the motor housing is higher. Attached Figure Description

[0021] Figure 1 This is a partial structural diagram of the motor of the blood pump in one embodiment of this application.

[0022] Figure 2 for Figure 1 A cross-sectional view along line AA.

[0023] Figure 3 This is a schematic diagram of the structure of a dispensing fixture according to an embodiment of this application.

[0024] Figure 4 This is an exploded structural diagram of a dispensing fixture according to an embodiment of this application.

[0025] Figure 5 for Figure 3 Sectional view of the structure at BB.

[0026] Figure 6 for Figure 5 A magnified structural diagram at point P.

[0027] Figure 7 for Figure 3 A schematic diagram of the base in the structure shown.

[0028] Figure 8 for Figure 3 A schematic diagram of the outer shell in the structure shown.

[0029] Figure 9 for Figure 3 A schematic diagram of the first fastener in the structure shown.

[0030] Figure 10 for Figure 3 A schematic diagram of the positioning block in the structure shown.

[0031] Figure 11 for Figure 10 Top view of the center positioning block.

[0032] Figure 12 This is a flowchart of a glue-filling method for an electric motor according to an embodiment of this application.

[0033] Figure 13 for Figure 12 Detailed flowchart of step S600.

[0034] Figure 14 This is a schematic diagram of the structure of a base according to an embodiment of this application.

[0035] Figure 15 In order to be in Figure 14 This is a schematic diagram showing how the motor is installed into the mounting slot based on the structure shown.

[0036] Figure 16 In order to be in Figure 15 A schematic diagram of the structure shown, with the first fastener installed.

[0037] Figure 17 In order to be in Figure 16 A schematic diagram of a structure in which a second fastener and sleeve are installed on the basis of the structure shown.

[0038] Figure 18 In order to be in Figure 17 A schematic diagram of a structure with a top column installed on top of the structure shown.

[0039] Figure 19 In order to be in Figure 18 A schematic diagram of a structure with a positioning block added to the structure shown. Detailed Implementation

[0040] To make the above-mentioned objectives, features, and advantages of this application more apparent and understandable, the specific embodiments of this application are described in detail below with reference to the accompanying drawings. Many specific details are set forth in the following description to provide a thorough understanding of this application. However, this application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar modifications without departing from the spirit of this application. Therefore, this application is not limited to the specific embodiments disclosed below.

[0041] One embodiment of this application provides a dispensing fixture suitable for dispensing adhesive into the motor of a blood pump. The blood pump is an interventional blood pump, which includes a motor, a cannula assembly, an impeller, and a conduit; wherein, the proximal end of the motor is connected to the conduit, and the distal end of the motor is connected to the cannula assembly; the impeller is disposed within the cannula assembly and connected to the motor shaft.

[0042] Please see Figure 1 and Figure 2 The blood pump motor 60 includes a motor housing 61 and a stator 62 disposed within the motor housing 61. The motor housing 61 has a first end 61a and a second end 61b. The second end 61b has an opening for injecting adhesive. Figures 3 to 6In one embodiment, the dispensing fixture includes a base 10, a first fixing member 20, a housing 80, and an axial positioning assembly 90. The base 10 has a mounting groove 121 and a mandrel 111. The mounting groove 121 is for inserting the first end 61a of the motor 60, and the mandrel 111 is located in the mounting groove 121 for passing through the motor 60. The first fixing member 20 is disposed on the base 10 and has a first positioning hole 21 for nesting with the outer peripheral surface of the first end 61a. The first fixing member 20 can connect with the base 10 to fix the first end 61a in the mounting groove 121. The housing 80 covers the first fixing member 20. The upper end of the housing 80 has a second positioning hole 41 for nesting with the outer peripheral surface of the second end 61b. The lower end of the housing 80 can connect with the base 10 to fix the second end 61b to the base 10. The axial positioning assembly 90 is detachably mounted on the top of the housing 80 and can be inserted into the top of the spindle 111.

[0043] The steps for applying adhesive to the motor 60 using the adhesive applicator of this application are as follows:

[0044] First step, such as Figure 14 and Figure 15 As shown, first insert the first end 61a of the motor 60 into the mounting slot 121, and at the same time, the spindle 111 is also inserted into the stator 62 of the motor 60. At this time, the first end 61a of the motor 60 can be finely adjusted to ensure that the bottom surface of the first end 61a of the motor 60 is completely in contact with the bottom surface of the mounting slot 121, so that the stator 62, the motor housing 61 and the spindle 111 are coaxial.

[0045] The second step, as Figure 16 As shown, the first positioning hole 21 of the first fixing member 20 is aligned with the second end 61b of the motor 60 and passes through, so that the first fixing member 20 is nested and fitted on the motor 60. The first positioning hole 21 is interference-fitted with the outer peripheral surface of the first end 61a. The first fixing member 20 is fixedly connected to the base 10, and the first end 61a of the motor 60 is fixed in the mounting groove 121.

[0046] The third step, as Figure 17 As shown, the second positioning hole 41 at the upper end of the housing 80 is aligned with the second end 61b of the motor 60 and passes through it, so that the upper end of the housing 80 is nested with the outer peripheral surface of the second end 61b of the motor 60, while the lower end of the housing 80 is connected and fixed to the base 10, thereby fixing the motor 60 on the base 10, ensuring that the motor 60 remains vertical along the axial direction, and avoiding radial deviation of the motor 60 relative to the spindle 111;

[0047] Step four, as Figure 17 As shown, adhesive is injected through the opening on the second end 61b of the motor 60, so that the adhesive enters the gap between the stator 62 and the motor housing 61.

[0048] Step 5, as Figure 18 and Figure 19 As shown, the axial positioning component 90 is installed on the upper end of the housing 80. The axial positioning component 90 is inserted and engaged with the spindle 111 to ensure that the spindle 111 and the stator 62 are coaxial, which facilitates subsequent cooling, drying and other processes.

[0049] As can be seen from the above description, the dispensing fixture of this application can first fix the first end 61a of the motor 60 through the first fixing member 20, which can fine-tune the fit between the first end 61a of the motor 60 and the bottom surface of the mounting groove 121, so that the stator 62, the motor housing 61 and the spindle 111 are coaxially arranged, reducing the occurrence of misalignment between the stator 62 and the spindle 111 due to the tilt of the first end 61a of the motor 60; then, the second end 61b of the motor 60 is fixed by the outer shell 80, ensuring that the motor 60 is vertically fixed on the base 10, further strengthening the coaxiality of the stator 62 of the motor 60 with the motor housing 61 and the spindle 111, making the coaxiality of these two even higher. It can be seen that the dispensing fixture of this application has a relatively simple structure, and all parts are nested and fixed with the motor 60, making the operation relatively simple.

[0050] After the adhesive solidifies, the mandrel 111 is withdrawn from the stator 62 of the motor 60, thereby forming a shaft hole in the central region of the stator 62 of the motor 60. This shaft hole is used to mount the rotating shaft of the motor 60. Therefore, when the motor is glued using the glue-gluing tool of this application, the coaxiality accuracy of the rotating shaft with the stator 62 and the motor housing 61 is higher after the rotating shaft is mounted.

[0051] Please see Figures 3 to 6 In one embodiment, the outer casing 80 includes a sleeve 30 and a second fixing member 40. The sleeve 30 has a first cavity 36 and a second cavity 37. The first cavity 36 can be nested with the outer peripheral surface of the first fixing member 20. A radial stepped surface 38 is provided between the second cavity 37 and the first cavity 36, and the radial stepped surface 38 faces the first fixing member 20. The second fixing member 40 is mounted on the radial stepped surface 38. A second positioning hole 41 is provided on the second fixing member 40, and the diameter of the second positioning hole 41 is smaller than the diameter of the second cavity 37.

[0052] Specifically, the diameter of the first cavity 36 is larger than the diameter of the second cavity 37, thus forming a radial stepped surface 38 at the transition between the second cavity 37 and the first cavity 36. The second fixing member 40 is disposed inside the first cavity 36 and fixed on the radial stepped surface 38, so that the second fixing member 40 and the sleeve 30 are integrated into a housing 80, which is then mounted on the base 10. The diameter of the first cavity 36 is equal to the diameter of the first fixing member 20, so that the inner wall surface of the first cavity 36 can nest and fit with the outer peripheral surface of the first fixing member 20, thereby allowing the lower end of the sleeve 30 to be sleeved and fixed to the first fixing member 20. In this way, the motor 60 is positioned by passing through the first positioning hole 21 and the second positioning hole 41, so that both ends of the motor 60 (i.e., the first end 61a and the second end 61b) are fixed by posts, thereby improving the stability of the motor 60 in positioning.

[0053] Please see Figure 4 and Figure 5 In one embodiment, the second fixing member 40 and the first fixing member 20 are axially spaced along the mandrel 111 to form a partition cavity 33. At least one of the first fixing member 20 and the base 10 is provided with an airflow channel communicating with the mounting groove 121. The sleeve 30 is provided with an air hole 32, which communicates with the partition cavity 33 and the airflow channel. Furthermore, the air hole 32 is also used to connect with a negative pressure device (not shown in the figure). Thus, when the negative pressure device is working, the gas inside the sleeve 30 is drawn out through the air hole 32.

[0054] Please see Figure 5 In one embodiment, the vent 32 is located between the first fixing member 20 and the second fixing member 40 and communicates with the diaphragm cavity 33. Thus, the first fixing member 20 and the second fixing member 40 are spaced apart, which on the one hand can respectively fix both ends of the positioning motor 60, resulting in a better fixing effect on the motor 60; on the other hand, the diaphragm cavity 33 formed by the cooperation of the first fixing member 20 and the second fixing member 40 communicates with the vent 32, thereby facilitating the extraction of gas from inside the sleeve 30, which in turn facilitates the filling of the gap between the stator 62 and the sleeve 30 with adhesive.

[0055] Optionally, the number of pores 32 may include, but is not limited to, one, two, three or other numbers.

[0056] Please see Figure 1 and Figure 2In one embodiment, a detection port 64 is provided on one side of the motor housing 61. After the glue-filling step, a sensor (not shown in the figure) needs to be installed in the motor 60 so that the sensor probe corresponds to the detection port 64. Therefore, during glue-filling, an installation channel for the sensor to pass through needs to be reserved inside the motor 60. In view of this, before glue-filling, a pre-embedded part 65 is inserted into the motor 60 along the axial direction to reserve the installation channel; and at least part of the pre-embedded part 65 extends outward from the detection port 64 to prevent the detection port 64 from being blocked by glue during subsequent glue-filling. After glue-filling is completed, the pre-embedded part 65 is removed to open the detection port 64, forming an installation channel in the original position of the pre-embedded part 65 inside the motor.

[0057] When installing the sensor, it passes through the mounting channel of the motor housing, allowing the sensor's optical fiber to pass through the mounting channel until the probe at the end of the optical fiber aligns with the detection port 64. The positions of the probe and detection port 64 are then calibrated, and finally, the detection window is sealed with soft adhesive material. In this way, blood pressure can be transmitted to the sensor probe through the soft adhesive material of the detection port 64, enabling the sensor to detect blood pressure. Since the diameter of the sensor's optical fiber is generally smaller than the diameter of the probe, optionally, the embedded part 65 includes a large-diameter section and a small-diameter section; the small-diameter section passes through the interior of the motor 60 along the axial direction to form a mounting channel for the optical fiber; one end of the large-diameter section is connected to the small-diameter section and bends outward from the inside of the detection port 64.

[0058] Specifically, in this embodiment, the first end 61a of the motor housing 61 is the far end of the motor 60. The side wall of the first end 61a is provided with a detection port 64 for sensor detection. An embedded part 65 extending along the axial direction of the motor 60 is pre-embedded inside the motor 60. The embedded part 65 is used to form an installation channel for the sensor to pass through. One end of the embedded part 65 is bent outward from the detection port 64. At least one of the mounting groove 121 and the first fixing member 20 is provided with a clearance groove on its side wall, which allows the embedded part 65 to extend out.

[0059] Please see Figures 5 to 7 Specifically, the side wall of the mounting groove 121 is provided with a first clearance groove 1211, and the first fixing member 20 is provided with a second clearance groove 22 that corresponds to and communicates with the first clearance groove 1211 (e.g., Figure 9 (As shown); the first clearance groove 1211 of the mounting groove 121 and the second clearance groove 22 of the first fixing member 20 can allow the large diameter section of the embedded part 65 to extend through.

[0060] Alternatively, the airflow channel can be formed by a clearance groove or other separately provided air vents 32.

[0061] Please see Figure 6 , Figure 7 and Figure 9 In one embodiment, the airflow channel includes a first clearance groove 1211 disposed on the side wall of the mounting groove 121, and a second clearance groove 22 disposed on the first fixing member 20 and correspondingly communicating with the first clearance groove 1211. Thus, before the potting step, the large-diameter section of the embedded part 65 extends outward sequentially through the first clearance groove 1211 and the second clearance groove 22, that is, the first clearance groove 1211 and the second clearance groove 22 provide clearance positions for the installation of the large-diameter section of the embedded part 65 on the motor housing 61.

[0062] Please see Figure 5 In one embodiment, the base 10 is provided with a second mating portion 113. The first fixing member 20 is provided with an annular sleeve 23 circumferentially arranged around the second mating portion 113. The annular sleeve 23 is press-fitted with the second mating portion 113. In this way, the first fixing member 20 can be quickly assembled with the base 10 by fitting the annular sleeve 23 onto the second mating portion 113. In addition, the press-fit between the annular sleeve 23 and the second mating portion 113 ensures a stable connection and high alignment accuracy.

[0063] In one embodiment, the first fastener 20 and the second fastener 40 are each, including but not limited to, metal fasteners and non-metal fasteners, and can be flexibly selected according to actual needs, without limitation here.

[0064] Please see Figure 3 and Figure 8 In one embodiment, the sleeve 30 and the second fixing member 40 are integrally machined and fixed together. Specifically, the second fixing member 40 is made of Teflon material, for example, and the sleeve 30 is a metal shell. The sleeve 30 is provided with a positioning part, for example, a radial stepped surface 38. When the second fixing member 40 is machined, the Teflon material is pressed into the positioning part of the sleeve 30, and then a second positioning hole 41 is formed. During the machining of the second positioning hole 41, it is necessary to ensure that the second positioning hole 41 is coaxial with the mandrel 111, and the hole diameter is slightly smaller than the outer diameter of the motor 60 so as to allow for an interference fit with the outer wall of the motor 60. Compared with the method of machining the second fixing member 40 and then assembling it into the positioning part of the sleeve 30, the coaxiality accuracy of the second positioning hole 41 and the mandrel 111 is higher.

[0065] Please see Figure 4 , Figure 5 and Figure 7 In one embodiment, the base 10 has a chassis 115 and a boss 112 disposed on the chassis 115. The boss 112 is provided with a mounting groove 121. A first fastener 20 is mounted on the boss 112. The inner wall surface of the first cavity 36 of the sleeve 30 also engages with the outer peripheral surface of the boss 112.

[0066] Please see Figures 5 to 7In one embodiment, the mounting groove 121 includes a bottom surface 121a and a side surface 121b; wherein the bottom surface 121a is a plane so as to be flush with the end face of the first end 61a. When the bottom end of the motor 60 is inserted into the mounting groove 121, the bottom end face of the motor 60 and the bottom surface 121a of the mounting groove 121 are flush with each other, thereby keeping the motor 60 vertical along the axial direction. After the glue is applied, the glue on the bottom surface of the stator 62 remains flush with the bottom surface 121a of the mounting groove 121, avoiding unevenness after the glue on the lower end face of the stator 62 solidifies, which can reduce interference between the rotor and the lower end face of the stator after the rotor is installed.

[0067] Generally, the diameter of the mounting groove 121 is designed to be the same as the diameter of the motor housing 61, so that the side surface 121b of the mounting groove 121 fits and is fixed to the outer peripheral surface of the motor housing 61. However, this application has found through research that there is a defect when the diameter of the mounting groove 121 is generally designed to be the same as the diameter of the motor housing 61. That is, when the first end 61a of the motor housing 61 is inserted into the mounting groove 121, friction is generated when the outer peripheral surface of the motor housing 61 contacts and rubs against the side surface 121b of the mounting groove 121. When the friction is uneven at different positions along the outer peripheral circumference of the motor housing 61, one side of the first end 61a of the motor housing 61 may be tilted upward, while the other side of the first end 61a may be relatively deeper into the mounting groove 121. This will result in the end face of the first end 61a not being flush with the bottom surface 121a of the mounting groove 121, and assembly personnel often find it difficult to notice this situation.

[0068] In view of the above, in order to reduce the occurrence of the above situation, in this embodiment, the diameter of the mounting groove 121 is larger than the diameter of the motor housing 61, so that the groove side 121b of the mounting groove 121 is spaced apart from the outer peripheral surface of the first end 61a, thus forming a gap (e.g. Figure 6 (S represents the gap). This design ensures that when the first end 61a of the motor housing 61 is inserted into the mounting groove 121, the outer circumferential surface of the first end 61a will not contact the side surface 121b of the mounting groove 121, thus eliminating friction and ensuring that the end face of the first end 61a of the motor housing 61 can fully penetrate and contact the bottom surface 121a of the mounting groove 121, remaining flush. Furthermore, before installing the first fastener 20, the gap allows inspection to confirm whether the end face of the first end 61a is flush with the bottom surface 121a of the mounting groove 121.

[0069] Please see Figure 3 , Figure 5 and Figure 6In one embodiment, the cross-sectional shape of the mounting groove 121 is the same as the cross-sectional shape of the bottom end of the motor 60, and the cross-sectional area of ​​the mounting groove 121 is larger than the cross-sectional area of ​​the bottom end of the motor 60. Specifically, the cross-sectional area of ​​the mounting groove 121 is, for example, set to between 105% and 120% of the cross-sectional area of ​​the bottom end of the motor 60. In this way, the bottom end of the motor 60 can be fully inserted and abut against the bottom surface of the mounting groove 121. In other words, the outer peripheral surface of the motor 60 and the inner wall of the mounting groove 121 do not contact each other, to avoid the inner wall of the mounting groove 121 being tightly against the outer peripheral surface of the motor 60, and the friction between them preventing the bottom end of the motor 60 from moving to a position contacting the bottom surface of the mounting groove 121. Furthermore, the cross-sectional size of the mounting groove 121 is not too large, so as to provide a certain positioning function for the inserted motor 60.

[0070] It should be noted that the cross-section of the mounting groove 121 refers to the section along the direction perpendicular to its bottom surface. The cross-section of the motor 60 refers to the section along the extension direction of its shaft. The shape of the mounting groove 121 is set according to the shape of the motor 60. In this embodiment, the cross-sectional shape of the motor 60 is set as a circle, and correspondingly, the cross-sectional shape of the mounting groove 121 is also set as a circle, and the diameter of the cross-section of the mounting groove 121 is larger than the outer diameter of the bottom cross-section of the motor 60.

[0071] Please see Figure 4 and Figure 5 In one embodiment, the axial positioning assembly 90 includes a positioning block 50 and a top post 70. The positioning block 50 has a pressure surface 54 and a first directional hole 51, the first directional hole 51 penetrating the pressure surface 54 for inserting the mandrel 111. The top post 70 has a first end face 72, a second end face 73, and a second directional hole 71, the second directional hole 71 being coaxially arranged with the first directional hole 51 and penetrating the first end face 72 and the second end face 73. The first end face 72 is used to abut against the pressure surface 54, and the second end face 73 is used to insert into an opening on the second end 611b to abut against the top surface of the stator 62.

[0072] Specifically, the stator 62 includes a magnetic core 62a and a coil 62b surrounding the magnetic core 62a; the second end face 73 of the top post 70 abuts against the top surface of the magnetic core 62a of the stator 62. Thus, after the adhesive fills the inside of the motor housing 61, it also extends through the second end face 73 of the top post 70 into the opening of the second end 61b of the motor 60, pressing the adhesive inside the motor 60 downwards against the top surface of the magnetic core 62a, until the second end face 73 abuts against the top surface of the magnetic core 62a, thereby making the adhesive surface inside the motor 60 flush with the end face of the stator 62.

[0073] Please see Figure 5 , Figure 10 and Figure 11In one embodiment, the second end 61b of the motor housing 61 is the proximal end of the motor 60, and a wire groove 63 is provided on the inner sidewall of the second end 61b for the wires of the stator 62 to pass through. The positioning block 50 is provided with an outlet hole 53 for the wires to pass outward. In this way, the wires of the stator 62 can extend outward from the outlet hole 53. The specific shape of the outlet hole 53 can be flexibly adjusted and set according to actual needs, including but not limited to regular and irregular shapes such as semicircle, circle, semi-ellipse, ellipse, polygon, etc., as long as the wires of the stator 62 can pass outward.

[0074] Specifically, the outlet hole 53 is semi-circular, and its wall has a flat wall 53a parallel to the axial direction of the mandrel 111, and an arcuate wall 53b surrounding the mandrel 111 and connecting the two ends of the flat wall 53a. The flat wall 53a has a directional post 52 extending along the axial direction of the mandrel 111, and a first directional hole 51 is disposed on the directional post 52 and tangent to the flat wall 53a. The upper end of the mandrel 111 passes through the top post 70 and the directional post 52 in sequence, that is, the top post 70 and the directional post 52 cooperate to define the mandrel 111, so that the mandrel 111 remains vertical and prevents the mandrel 111 from deflecting radially. In addition, the pressure surface 54 of the positioning block 50 is at least partially formed on the lower end face of the directional post 52, that is, the lower end face of the directional post 52 can abut against the first end face 52 of the top post 70. When the axial positioning assembly 90 is installed, the first directional hole 51 and the mandrel 111 can be observed to be aligned and inserted from the outlet hole 53.

[0075] Please see Figure 5 , Figure 8 and Figure 10 Optionally, the sleeve 30 has a second open end 35, which is further provided with a receiving groove 351. The positioning block 50 is disposed in the receiving groove 351 and is interference-fitted with the receiving groove 351. The lower end face of the positioning block 50 is provided with a protrusion 54, which extends from the receiving groove 351 into the second cavity 37 and is interference-fitted with the inner peripheral wall of the second cavity 37.

[0076] Please see Figure 4 , Figure 5 and Figure 7In one embodiment, the base 10 includes a base 11 and a mounting seat 12 connected to the base 11. The base 11 is made of a metal material, which may be, but is not limited to, stainless steel, iron, copper, aluminum alloy, etc. A spindle 111 is disposed on the base 11. The base 11 includes a chassis 115 and a boss 112, the boss 112 protruding from the upper surface of the chassis 115. The mounting seat 12 is mounted on the boss 112, and a mounting groove 121 is disposed on the mounting seat 12. The mounting seat 12 may be made of a non-metallic material, which may be, but is not limited to, Teflon, silicone, PVC, PU, ​​etc. As can be seen, since the base 11 is made of a metal material, the structural strength is guaranteed; the mounting seat 12 is made of a non-metallic material, and during the process of the motor 60 being installed into the mounting groove 121, the mounting seat 12 can act as a buffer, making it less likely to damage the motor 60.

[0077] Please see Figure 4 , Figures 5 to 7 In one embodiment, the mounting base 12 may be made of Teflon material, such that in the processing steps of the base 10: the mounting base 12 is installed in the base 11 before the mounting groove 121 is processed, and then the mounting groove 121 is further processed. During the processing of the mounting groove 121, the mounting groove 121, the mandrel 111, and the mounting part on the base 11 for mounting the sleeve 30 are coaxially arranged, which helps to ensure the accuracy of the coaxial arrangement.

[0078] Please see Figure 4 , Figures 5 to 7 In one embodiment, the first positioning hole 21 of the first fixing member 20 is interference-fitted with the outer wall of the motor 60. The second positioning hole 41 of the second fixing member 40 is interference-fitted with the outer wall of the motor 60. The base 10 is provided with a boss 112 that is inserted into the first open end 34, and the boss 112 is interference-fitted with the first open end 34. In this way, the sleeve 30 is stably mounted on the base 10. In addition, the first fixing member 20 and the second fixing member 40 can provide a good fixing effect for the motor 60. Furthermore, after the motor 60 is installed into the potting fixture, the accuracy of the coaxial setting of the motor 60 and the mandrel 111 can be improved.

[0079] Optionally, when the base 10 is provided with a boss 112 that engages with the first open end 34, the second mating part 113 is specifically disposed on the top surface of the boss 112.

[0080] Please see Figures 3 to 5In one embodiment, the bottom wall of the base 10 is provided with a recessed groove 116, and a connecting hole 114 is provided through the bottom 116a of the recessed groove 116 near the upper surface of the base 10. The lower end of the outer shell 80 is provided with a mating hole (not shown in the figure), and the mating hole and the connecting hole 114 are connected by a fastener. The mating hole is specifically located at the lower end of the sleeve 30. The fastener is a screw, which has a nut and a stud. The stud passes upward from the recessed groove 116 and the connecting hole 114 to the mating hole, thereby connecting and fixing the sleeve 30 and the base 10. The nut is hidden in the recessed groove 116 and abuts against the bottom 116a of the recessed groove 116.

[0081] Furthermore, the settling groove 116 and the connecting hole 114 are arranged in an arc shape around the circumference of the base 10. When installing the sleeve 30, after the sleeve 30 is placed on the base 10, only a slight adjustment of the sleeve 30 is needed so that the mating hole at the lower end of the sleeve 30 can be aligned with any position of the connecting hole 114 to allow the fastener to be inserted for connection. No single precise alignment is required for connection, reducing assembly difficulty and effectively improving assembly efficiency.

[0082] Optionally, the sink 116 and the connecting hole 114 are each provided in two or other quantities, with the two connecting holes 114 arranged at intervals on the base 10.

[0083] Please see Figures 13 to 19 This application also provides a method for potting an electric motor, wherein the electric motor 60 is a blood pump motor 60, and the method for potting the stator 62 of the electric motor 60 includes:

[0084] Step S100: Provide a dispensing fixture according to any of the above embodiments, wherein the base 10, the first fixing member 20, the outer shell 80 and the axial positioning component 90 of the dispensing fixture are in an unconnected state;

[0085] Step S200, as follows Figure 14 and Figure 15 As shown, the motor 60 is inserted onto the spindle 111 of the base 10, and the first end 61a of the motor 60 is inserted into the mounting groove 121 of the base 10.

[0086] By observing from the side of the base 10, it can be checked whether the lower end of the motor 60 is completely submerged in the bottom surface of the mounting groove 121. If not, make a fine adjustment.

[0087] Step S300, as follows Figure 16 As shown, the first positioning hole 21 of the first fixing member 20 passes through the second end 61b of the motor 60 to nest with the outer peripheral surface of the first end 61a of the motor 60, and the first fixing member 20 is connected and fixed to the base 10. Specifically, the first fixing member 20 and the base 10 are interference-fitted.

[0088] Step S400, as follows Figure 17As shown, the housing 80 is placed over the base 10, and the second positioning hole 41 of the housing 80 passes through the second end 61b of the motor 60, thus nesting with the outer peripheral surface of the second end 61b of the motor 60. Specifically, the lower end of the housing 80 is interference-fitted with the base 10.

[0089] Step S500, as follows Figure 17 As shown, adhesive is injected through the opening at the second end 61b of the motor 60, allowing the adhesive to enter the gap between the stator 62 and the motor housing 61 of the motor 60, and a vacuum is drawn to fill the gap with adhesive.

[0090] Step S600, as follows Figure 18 and Figure 19 As shown, the axial positioning component 90 is installed on the top of the housing 80 and the axial positioning component 90 is inserted into the top end of the spindle 111 to calibrate the coaxiality of the motor housing 61, the stator 62 and the spindle 111.

[0091] In the aforementioned glue-filling method for the motor 60, the motor 60 is positioned by passing through the first positioning hole 21 and the second positioning hole 41, and the spindle 111 is positioned by passing through the axial positioning assembly 90. This ensures high coaxiality accuracy of the shaft hole formed after glue filling in the motor 60, guaranteeing that after the rotating shaft is installed, the rotating shaft, stator 62, and motor housing 61 are coaxially arranged, resulting in high assembly accuracy of the rotating shaft. Furthermore, compared to glue-filling devices in related technologies that require multiple components to work together, the glue-filling fixture in this embodiment has a relatively simple structure and is easy to operate.

[0092] In one embodiment, during step S500, a vacuum is applied to the inside of the sleeve 30, causing the gas inside the sleeve 30 to be extracted outward through the vent 32. This facilitates the filling of the gap between the stator 62 and the sleeve 30 with adhesive. It should be noted that if a small amount of adhesive overflows from the inside of the motor housing 61 during the evacuation process of the sleeve 30, for example after the adhesive curing step, burrs will be formed on the outer surface of the motor housing 61. These burrs can be removed by using a cutting tool to deburr the surface of the motor housing 61.

[0093] In one embodiment, the first end 61a of the motor housing 61 is the distal end of the motor 60. The side wall of the first end 61a is provided with a detection port 64 for sensor detection. The interior of the motor 60 needs to reserve an installation channel for the sensor to pass through. Therefore, before step S100, step S90 is included: a pre-embedded part 65 is installed in the motor housing 61, and the pre-embedded part 65 is inserted into the interior of the motor 60 along the axial direction of the motor 60 to reserve an installation channel; and at least part of the pre-embedded part 65 extends outward from the detection port 64 to prevent the detection port 64 from being blocked by glue during subsequent glue filling. After glue filling is completed, the pre-embedded part 65 is removed to open the detection port 64, and an installation channel is formed in the interior of the motor 60 at the original position of the pre-embedded part 65. At least one of the mounting groove 121 of the base 10 and the first fixing member 20 is provided with a clearance groove on its side wall, which allows the pre-embedded part 65 to extend out.

[0094] In one embodiment, the axial positioning assembly 90 includes a positioning block 50 and a top post 70. The positioning block 50 has a pressure surface 54 and a first directional hole 51, the first directional hole 51 penetrating the pressure surface 54 for insertion of the mandrel 111. The top post 70 has a first end face 72, a second end face 73, and a second directional hole 71, the second directional hole 71 being coaxially arranged with the first directional hole 51 and penetrating both the first end face 72 and the second end face 73. Based on this, please refer to... Figure 13 , Figure 18 and Figure 19 Step S600 specifically includes the following steps:

[0095] Step S610, as follows Figure 18 As shown, the second positioning hole 71 of the top post 70 is connected to the spindle 111, and the second end face 73 of the top post 70 extends into the opening of the second end 61b of the motor housing 61, and abuts against the upper end face of the stator 62 (specifically the upper end face of the magnetic core 62a).

[0096] Step S620, as follows Figure 19 As shown, the positioning block 50 is installed on the upper end of the housing 80, and the first directional hole 51 of the positioning block 50 is connected to the spindle 111. The pressure surface 54 of the positioning block 50 abuts against the first end face 72 of the top post 70, thereby applying pressure to the top post 70 against the stator 62. This causes the second end face 73 of the top post 70 to press the adhesive in the second end 61b of the motor 60 until it is flush with the upper end face of the stator 62. This ensures that both ends of the stator 62 remain flat after the adhesive is applied.

[0097] In this application, unless otherwise expressly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; 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; they can refer to the internal communication of two components or the interaction between two components, unless otherwise expressly limited. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0098] It should be noted that if an element is referred to as being "fixed to" or "set on" another element, it can be directly on the other element or there may be an intervening element. If an element is considered to be "connected to" another element, it can be directly connected to the other element or there may be an intervening element. If so, the terms "vertical," "horizontal," "upper," "lower," "left," "right," and similar expressions used in this application are for illustrative purposes only and do not represent the only possible implementation.

[0099] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0100] The embodiments described above are merely illustrative of several implementation methods of this application, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the patent application. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this application, and these all fall within the protection scope of this application. Therefore, the protection scope of this patent application should be determined by the appended claims.

Claims

1. A dispensing fixture, suitable for dispensing adhesive into the motor of a blood pump, the motor comprising a motor housing and a stator disposed within the motor housing, the motor housing having a first end and a second end, the second end having an opening, characterized in that, The dispensing fixture includes: The base is provided with a mounting groove and a mandrel. The mounting groove is used for inserting the first end, and the mandrel is provided in the mounting groove for the stator of the motor to pass through. The first fixing member has a first positioning hole for the outer peripheral surface of the first end to be nested and fitted. The first fixing member can be connected to the base to fix the first end in the mounting groove. The outer casing has a second positioning hole at its upper end for nesting with the outer peripheral surface of the second end. The outer casing covers the first fixing member and can be connected to the base to fix the second end to the base. The outer casing includes a sleeve and a second fixing member. The sleeve has a first cavity and a second cavity, the first cavity nesting with the outer peripheral surface of the first fixing member. A radial stepped surface is provided between the second cavity and the first cavity. The second fixing member is mounted on the radial stepped surface. The second positioning hole is provided on the second fixing member, and the diameter of the second positioning hole is smaller than the diameter of the second cavity. The second fixing member and the first fixing member are spaced axially along the mandrel to form a partition cavity. At least one of the first fixing member and the base has an airflow channel communicating with the mounting groove. The sleeve has an air hole communicating with the partition cavity and the airflow channel. An axial positioning assembly is detachably mounted on the top of the housing and can be inserted into the top end of the mandrel. The axial positioning assembly includes a positioning block and a top post. The positioning block is detachably connected to the housing and has a pressure surface and a first directional hole. The first directional hole penetrates the pressure surface for insertion of the mandrel. The top post has a first end face, a second end face, and a second directional hole. The second directional hole is coaxially arranged with the first directional hole and penetrates the first end face and the second end face for passage of the mandrel. The first end face can abut against the pressure surface, and the second end face can be inserted into the opening to abut against the top surface of the stator.

2. The dispensing fixture according to claim 1, characterized in that, The base includes a chassis and a boss on the chassis, the boss having the mounting groove; the first fixing member is mounted on the boss; the inner wall of the first cavity of the sleeve is in a ring fit with the outer peripheral surface of the boss.

3. The dispensing fixture according to claim 1 or 2, characterized in that, The mounting groove includes a bottom surface and a side surface; wherein the bottom surface is set as a plane so as to be flush with and fit against the end face of the first end.

4. The dispensing fixture according to claim 3, characterized in that, The diameter of the mounting groove is larger than the diameter of the motor, so that the side of the mounting groove is spaced apart from the outer peripheral surface of the first end to form a gap.

5. The dispensing fixture according to claim 1, characterized in that, The positioning block has a wire outlet hole through which the motor wires pass outward. The wire outlet hole is semi-circular, such that the hole wall has a flat wall parallel to the axis of the spindle, and an arc wall surrounding the spindle and connecting the two ends of the flat wall.

6. The dispensing fixture according to claim 5, characterized in that, The planar wall is provided with a directional post extending axially along the mandrel, and the first directional hole is disposed on the directional post and is tangent to the planar wall.

7. The dispensing fixture according to claim 1 or 2, characterized in that, The first end of the motor housing is the far end of the motor. A detection port for sensor detection is opened on the side wall of the first end. An embedded part extending along the axial direction of the motor is pre-embedded inside the motor. The embedded part is used to form an installation channel for the sensor to pass through. One end of the embedded part extends outward from the detection port.

8. The dispensing fixture according to claim 7, characterized in that, At least one of the mounting groove and the first fixing member has a clearance groove on its side wall, and the clearance groove allows the embedded part to extend out.

9. The dispensing fixture according to claim 1 or 2, characterized in that, The base has a groove on its bottom wall, and a connecting hole is provided in the bottom of the groove near the upper surface of the base. The lower end of the outer shell has a mating hole, and the mating hole and the connecting hole are connected by a fastener. The settling groove and the connecting hole are both arranged in an arc shape around the circumference of the base, so that the mating hole can correspond to any position of the connecting hole and the fastener can be inserted through it.

10. A method for potting an electric motor, wherein the motor is a blood pump motor, characterized in that, The method for potting adhesive into the motor stator includes: A dispensing fixture as described in any one of claims 1 to 9 is provided, wherein the base, first fixing member, housing and axial positioning assembly of the dispensing fixture are in an unconnected state; The motor is threaded onto the spindle of the base, and the first end of the motor is inserted into the mounting slot of the base; The first positioning hole of the first fixing member passes through the second end of the motor to nest and engage with the outer peripheral surface of the first end of the motor, and the first fixing member is connected and fixed to the base; The outer casing is placed over the base, and the second positioning hole of the outer casing passes through the second end of the motor and is nested with the outer peripheral surface of the second end of the motor. Inject adhesive into the gap between the stator and the motor housing through the opening at the second end of the motor, and then draw a vacuum to fill the gap with adhesive. The axial positioning assembly is installed on the top of the housing and inserted into the top of the spindle to calibrate the coaxiality of the motor housing, the stator and the spindle.

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