A kind of potting tool of hollow cup motor, potting process and motor

Abstract

This invention relates to a potting fixture, potting process, and motor for a hollow cup motor. The potting fixture includes a mold body and a mold core. The mold body has a receiving channel extending through both sides. One end of the receiving channel is an installation port, and the other end is an exhaust port. The mold core is used to install motor functional components, and at least a portion of it can extend into the receiving channel through the installation port and seal the installation port. A second receiving portion for accommodating the iron core and coil is formed between the mold core and the receiving channel, as well as a first receiving portion and a third receiving portion located on both axial sides of the second receiving portion. The first receiving portion is connected to the injection port. The second receiving portion is configured such that at least the portion corresponding to both axial ends of the iron core is in close contact with the iron core, so that the first receiving portion and the third receiving portion are connected only through the space where the coil is located. The third receiving portion is used to accommodate bearing components and is connected to the exhaust port. The three-phase wires of the motor can be led out through the exhaust port. The potting fixture of this invention can avoid forming a parting line in the housing.

Description

Technical Field

[0001] This invention relates to the field of medical device technology, and in particular to a potting fixture, potting process, and motor for a hollow cup motor. Background Technology

[0002] During high-risk percutaneous coronary intervention (PCI) procedures, patients often have fragile hearts with insufficient blood supply, leading to higher surgical risks. To address this, companies have developed percutaneous catheter pumps. Percutaneous ventricular assist devices (VCAPDs) can be implanted in the heart via minimally invasive methods such as femoral artery puncture or incision, without open-chest surgery. Their main advantages include: ① minimally invasive percutaneous implantation significantly reduces surgical risks; ② intravenous access avoids physical trauma to cardiac tissue, potentially allowing for the recovery of cardiac function. These advantages enable them to be used to maintain vital signs in patients with severe heart failure or as adjunctive therapy during high-risk PCI procedures.

[0003] The micromotor within the catheter pump is the core component of the ventricular assist device (VAD). Its function is to generate pressure by driving an impeller at high speed, pumping blood from the left ventricle into the aorta. This ensures that heart failure patients, despite insufficient cardiac function, still receive the necessary circulatory blood flow to maintain their vital signs. Because it needs to be implanted into the left ventricle via an artery, the outer shell material of the micromotor, which comes into direct contact with the body, must meet biocompatibility requirements. Furthermore, the micromotor's dimensions are critical, with an outer diameter generally not exceeding 21Fr / 7mm. Simultaneously, to generate the necessary flow to maintain the patient's vital signs, the micromotor's rotational speed is required, typically reaching tens of thousands of revolutions per minute (rpm) under load. Therefore, the design of the micromotor is crucial to the performance and safety of the VAD.

[0004] The micro motor needs to be placed in the aorta and come into direct contact with blood, so the material of the casing must have a smooth surface and good biocompatibility. On the other hand, the motor is a transmission component, which is difficult to completely seal. The motor stator is composed of coils, magnets, etc., and these materials have poor biocompatibility. Therefore, potting technology can be used to seal the components and prevent blood from coming into direct or indirect contact with the coils and magnets.

[0005] Existing potting solutions typically pot the entire shape of the motor. Mold lines are inevitable after molding, and it is difficult to achieve a particularly smooth finish after post-processing. This is because the motor casing comes into direct contact with blood, and improper processing can affect product yield to some extent. Summary of the Invention

[0006] This invention discloses a potting fixture, potting process, and motor for a hollow cup motor, aiming to solve the technical problems existing in the prior art.

[0007] The present invention adopts the following technical solution:

[0008] On one hand, the present invention provides a potting fixture for a coreless motor. The potting fixture is used to pot the motor core, a coil located inside the core, and a bearing assembly to form a single functional motor component. The potting fixture includes a mold body and a mold core. The mold body has a receiving channel that extends through both sides. One end of the receiving channel is an installation port, and the other end is an exhaust port. The mold core is used to install the motor functional component, and at least a portion of it can extend into the receiving channel through the installation port and seal the installation port. A second receiving portion for accommodating the core and the coil, and a first receiving portion and a third receiving portion located on both axial sides of the second receiving portion are formed between the mold core and the receiving channel. The first receiving portion is connected to the injection port. The second receiving portion is configured such that at least the portion corresponding to both axial ends of the core is in close contact with the core, so that the first receiving portion and the third receiving portion are connected only through the space where the coil is located. The third receiving portion is used to accommodate the bearing assembly and is connected to the exhaust port. The three-phase wires of the motor can be led out through the exhaust port.

[0009] In the coreless cup motor potting fixture of the present invention, the mounting port is located on the bottom surface of the mold body; the vent and the injection port are located on the top surface of the mold body; the first receiving part, the second receiving part, the third receiving part and the vent are arranged vertically from low to high.

[0010] In the filling fixture of the hollow cup motor of the present invention, the injection port is connected to the communication port on the first receiving part through the flow channel opened in the mold body; the flow channel includes a longitudinal section and a transverse section; one end of the longitudinal section is connected to the injection port, and the other end is connected to one end of the transverse section; the other end of the transverse section is connected to the communication port.

[0011] In the potting fixture for the hollow cup motor of the present invention, the area of ​​the connecting port is smaller than the cross-sectional area of ​​other parts of the flow channel.

[0012] In the potting fixture for the hollow cup motor of the present invention, a buffer cavity is provided on the flow channel; the buffer cavity is wider than the flow channel; the buffer cavity is located on the side of the transverse section away from the first receiving portion.

[0013] In the coreless motor potting fixture of the present invention, the bottom surface of the mold core is the placement surface of the potting fixture; the placement surface is provided with a fixing member; the fixing member is used to fix the position of the potting fixture during potting.

[0014] In the potting fixture for the hollow cup motor of the present invention, the portion of the mold core extending into the receiving channel is a columnar structure, and includes a first shaft diameter segment, a second shaft diameter segment, a third shaft diameter segment, a fourth shaft diameter segment, and a fifth shaft diameter segment whose diameter decreases sequentially along the direction from the mounting port to the vent port of the receiving channel and are coaxially connected; the first shaft diameter segment is sealed to the receiving channel; the second shaft diameter segment and the receiving channel form the first receiving portion; the third shaft diameter segment is used to install the coil; the fourth shaft diameter segment is used to seal to the bearing assembly; and the fifth shaft diameter segment is used to install the bearing assembly.

[0015] In the potting fixture of the hollow cup motor of the present invention, the stepped surface between the second shaft diameter section and the third shaft diameter section abuts against the end face of the iron core; the first receiving part connects to the space where the coil is located through a passage provided on the second shaft diameter section; a plurality of protrusions are provided at intervals along the circumference of the second shaft diameter section on the stepped surface; the protrusions abut against the end face of the iron core; adjacent protrusions and the iron core form the passage.

[0016] In the coreless cup motor potting fixture of the present invention, the mold body includes an upper mold body and a lower mold body; the upper mold body and the lower mold body are detachably connected and each has a receiving groove; the two receiving grooves together form the receiving channel, and the groove opening of each receiving groove includes the axis of the receiving channel.

[0017] In the potting fixture for the hollow cup motor of the present invention, the upper mold body and the lower mold body are positioned by positioning pins and positioning holes.

[0018] In a second aspect, the present invention also provides a potting process for manufacturing motor functional components using the above-mentioned potting tooling, the motor functional components including an iron core, coils, and bearing assemblies, comprising the following steps:

[0019] The motor's iron core, coil, and bearing assembly are mounted on the mold core;

[0020] Assemble the mold core with the mold body;

[0021] Connect the injection port to the injection head of the injection device;

[0022] Place the potting fixture in a vacuum device and evacuate the vacuum.

[0023] The potting compound is fed into the potting fixture through the injection port. The potting compound passes through the first receiving part, the coil and the third receiving part in sequence and fills the internal gaps. Then the feeding of the potting compound stops.

[0024] After the potting compound in the potting fixture has cured, the mold core is extracted, the mold body is removed, and the motor functional components are obtained.

[0025] In a third aspect, the present invention also provides an electric motor, which includes a motor functional component, a housing, and a rotor obtained by the above-described potting process; the rotor is located within the motor functional component and one end is mounted on the bearing assembly; the housing covers the surface of the motor functional component; the motor functional component is an integral structure formed by potting an iron core, a coil, and a bearing assembly.

[0026] In the motor of the present invention, the housing includes a motor housing and a tail cover; the motor housing is a cylindrical housing with an opening at the top and bottom, and is fitted onto the outer surface of the motor functional component; the tail cover is a conical housing with an opening at the top and bottom, and is fitted onto the side of the motor functional component where the three-phase lines of the motor are provided.

[0027] In the motor of the present invention, the bearing assembly includes a rolling bearing, an upper bearing cover, and a lower bearing cover; the upper bearing cover and the lower bearing cover are respectively fastened to both sides of the rolling bearing, and the upper bearing cover is away from the coil.

[0028] The motor of the present invention also includes a solder pad; the solder pad is mounted on the upper end cover of the bearing, and the solder pad, the coil lead wire and at least a portion of the motor three-phase wires are encapsulated in the motor functional components; the coil lead wire and the motor three-phase wires are soldered to the solder pad.

[0029] The technical solution adopted in this invention can achieve the following beneficial effects:

[0030] This invention mainly provides a potting fixture for a hollow cup motor. Based on the tight fit between the iron core and the inner wall of the second receiving part, the part outside the outer surface of the iron core is not potted, that is, the shell structure is not formed by potting, thereby avoiding the problem of parting line formed by potting the shell. Furthermore, based on the connection between the first receiving part and the third receiving part by the space for accommodating the coil, one-time potting molding is achieved, simplifying the potting process. Attached Figure Description

[0031] To more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings used in the description of the embodiments will be briefly introduced below, forming part of the present invention. The illustrative embodiments of the present invention and their descriptions explain the present invention and do not constitute an improper limitation of the present invention. In the accompanying drawings:

[0032] Figure 1 This is a schematic diagram of the structure of a potting fixture for a hollow cup motor according to the present invention;

[0033] Figure 2 This is a schematic diagram of the structure of the mold body of the present invention;

[0034] Figure 3 This is a schematic diagram of the structure of a potting fixture for a hollow cup motor according to the present invention during the potting process;

[0035] Figure 4 This is a schematic diagram of the structure of the mold core of the present invention;

[0036] Figure 5 This is a three-dimensional structural schematic diagram of a potting fixture for a hollow cup motor according to the present invention;

[0037] Figure 6 This is one of the structural schematic diagrams of the motor of the present invention;

[0038] Figure 7 This is the second schematic diagram of the motor structure of the present invention.

[0039] Explanation of reference numerals in the attached figures:

[0040] 100. Filling tooling; 101. Mold body; 101a. Upper mold body; 101b. Lower mold body; 1011. Receiving channel; 10111. First receiving part; 10112. Second receiving part; 10113. Third receiving part; 1012. Mounting port; 1013. Vent port; 1014. Injection port; 1015. Flow channel; 10151. Longitudinal section; 10152. Transverse section; 1016. Buffer cavity; 1017. Passageway; 1018. Connecting port; 1019a. Positioning pin; 1019b. Positioning hole; 102. Mold core; 1021. First shaft diameter section; 1022. Second shaft diameter section; 1023. Third shaft diameter section; 1024. Fourth shaft diameter section; 1025. Fifth shaft diameter section; 1026. Protrusion;

[0041] 200. Motor functional components; 201. Iron core; 202. Coil; 203. Bearing assembly; 2031. Rolling bearing; 2032. Upper bearing cover; 2033. Lower bearing cover; 300. Housing; 301. Motor housing; 302. Tail cover; 400. Rotor; 401. Shaft; 402. Magnet; 500. Head bearing; 600. Welding pad; 700. High voltage tube; 800. Three-phase wire. Detailed Implementation

[0042] To make the objectives, technical solutions, and advantages of this invention clearer, the technical solutions of this invention will be clearly and completely described below in conjunction with specific embodiments and corresponding drawings. In the description of this invention, it should be noted that the term "or" is generally used to include the meaning of "and / or," unless otherwise expressly indicated.

[0043] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or a magnetic connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal communication between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances. Furthermore, in the description of this application, the terms "first," "second," etc., are used only for distinguishing descriptions and should not be construed as indicating or implying relative importance. In the description of this invention, "a plurality of" means at least two, such as two, three, or more, unless otherwise explicitly specified.

[0044] In the field of interventional medical device technology, the direction closer to the operator is generally defined as proximal, and the direction farther from the operator is defined as distal. The direction of the central axis of objects such as cylinders and tubes is defined as axial. Radial refers to the direction passing through the central axis in the radial plane, for example, a straight line along a diameter or radius, or a straight line perpendicular to the central axis.

[0045] Obviously, the described embodiments are only some, not all, of the embodiments of the present invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort are within the scope of protection of the present invention.

[0046] To address the problems existing in the prior art, this application provides a potting fixture, potting process, and motor for a hollow cup motor.

[0047] Example 1

[0048] This embodiment provides a potting fixture for a hollow cup motor. The potting fixture is used to pot the motor core 201, the coil 202 located inside the core 201, and the bearing assembly 203 to form an integrated motor functional component 200. The bearing assembly 203 is located at the tail end of the motor, which is the side of the motor connected to the external cable. Figures 1-4As shown, the potting fixture 100 includes a mold body 101 and a mold core 102; the mold body 101 has a receiving channel 1011 extending through both sides; one end of the receiving channel 1011 is a mounting port 1012, and the other end is a venting port 1013; the mold core 102 is used to install the motor functional component 200, and at least a portion of it can extend into the receiving channel 1011 through the mounting port 1012, and seal the mounting port 1012. When the mold core 102 is completely located within the receiving channel 1011, its passage... The mold core 102 is sealed to the inner wall of the receiving channel 1011 via its sidewall. When a portion of the mold core 102 is located within the receiving channel 1011, the mold core 102 can be sealed to the inner wall of the receiving channel 1011 via its sidewall, or to the end of the receiving channel 1011 via its portion located outside the receiving channel 1011. A second receiving portion 10112 for accommodating the iron core 201 and the coil 202 is formed between the mold core 102 and the receiving channel 1011, and a first receiving portion 101 is located on both axial sides of the second receiving portion 10112. 11 and the third receiving portion 10113; the first receiving portion 10111 is connected to the injection port 1014; preferably, the injection port 1014 can be configured to be adapted to the injection head of the injection device, such as a funnel-shaped structure; the second receiving portion 10112 is configured such that at least the portion corresponding to both axial ends of the iron core 201 is in close contact with the iron core 201, so that the first receiving portion 10111 and the third receiving portion 10113 are connected only through the space where the coil 202 is located, that is, the potting compound does not flow in during potting. Between the iron core 201 and the second receiving part 10112; preferably, the outer surface of the iron core 201 is in close contact with the inner wall of the second receiving part 10112; the third receiving part 10113 is used to receive the bearing assembly 203 and is connected to the exhaust port 1013, and there is a gap between the third receiving part 10113 and the outer surface of the bearing assembly 203 to allow the potting compound to pass through during potting; the three-phase wire 800 of the motor can be led out through the exhaust port 1013, and the three-phase wire 800 of the motor is used to connect to the external cable.

[0049] The present invention provides a potting fixture for a hollow cup motor. Based on the fact that the iron core 201 is tightly fitted to the inner wall of the second receiving part 10112, the part outside the outer surface of the iron core 201 is not potted, that is, the shell structure is not formed by potting, thereby avoiding the problem of parting line formed by potting the shell. Furthermore, based on the connection between the first receiving part 10111 and the third receiving part 10113 through the space of the coil 202, one-time potting molding is achieved, simplifying the potting process.

[0050] In some preferred embodiments, such as Figure 1 As shown, the side walls of the first receiving part 10111, the second receiving part 10112 and the third receiving part 10113 are flush with each other to facilitate installation during subsequent housing installation.

[0051] In some preferred embodiments, such as Figure 2As shown, the receiving channel 1011 is a cylindrical channel and is coaxially arranged with the mold core 102. The end of the receiving channel 1011 tapers to form an exhaust port 1013.

[0052] In some preferred embodiments, such as Figures 1-3 As shown, the mounting port 1012 of the mold body 101 is located on the bottom surface of the mold body 101; the vent 1013 and the injection port 1014 are located on the top surface of the mold body 101; the first receiving part 10111, the second receiving part 10112, the third receiving part 10113 and the vent 1013 are arranged vertically from low to high, so that during potting, the potting compound fills the gap between the receiving channel 1011 and the iron core 201, the coil 202 and the bearing assembly 203 from bottom to top; based on the bottom-up potting method, it is possible to have Effectively reduces the bubble rate inside the motor after molding, such as reducing the bubble rate on the coil 202, improving the product qualification rate, and effectively reducing production costs; preferably, the receiving channel 1011 extends vertically, and the mold core 102 is coaxially arranged with the receiving channel 1011, so that the first receiving part 10111, the second receiving part 10112, the third receiving part 10113 and the vent 1013 are arranged sequentially from bottom to top; the injection port 1014 is set on the top surface of the mold body 101 to prevent the potting glue from overflowing when the potting tool 100 is moved.

[0053] In some preferred embodiments, such as Figure 1 and 2 As shown, the injection port 1014 is connected to the communication port 1018 on the first receiving part 10111 through the flow channel 1015 opened in the mold body 101; preferably, the flow channel 1015 is arranged adjacent to the receiving channel 1011 of the mold body 101; the flow channel 1015 includes a longitudinal section 10151 and a transverse section 10152; one end of the longitudinal section 10151 is connected to the injection port 1014, and the other end is connected to one end of the transverse section 10152; the other end of the transverse section 10152 is connected to the communication port 1018.

[0054] Preferably, the area of ​​the connection port 1018 is smaller than the cross-sectional area of ​​other parts of the flow channel 1015, so as to reduce the impact on the surface of the integral motor functional component 200 formed by potting during demolding.

[0055] Preferably, such as Figure 2 As shown, a buffer cavity 1016 is provided on the flow channel 1015; the buffer cavity 1016 is wider than the flow channel 1015, and the buffer cavity 1016 is located on the side of the transverse section 10152 away from the first receiving part 10111; by providing the buffer cavity 1016, the volume of the flow channel 1015 is increased, so that more potting compound can be accommodated during potting to maintain the continuity of potting.

[0056] In some preferred embodiments, the bottom surface of the mold core 102 is the placement surface of the potting fixture 100; the placement surface is provided with a fixing member (not shown); the fixing member is used to fix the position of the potting fixture 100 during potting, such as fixing it on a table; the fixing member can be a magnet, a suction cup or other existing device that can achieve fixation, which will not be described in detail.

[0057] In some preferred embodiments, such as Figure 1 , Figure 2 and Figure 4 As shown, the portion of the mold core 102 extending into the receiving channel 1011 is a columnar structure, such as a cylindrical structure, and includes a first shaft diameter section 1021, a second shaft diameter section 1022, a third shaft diameter section 1023, a fourth shaft diameter section 1024, and a fifth shaft diameter section 1025 whose diameters decrease sequentially along the direction from the mounting port 1012 to the vent port 1013 of the receiving channel 1011 and are coaxially connected. The first shaft diameter section 1021 is sealed to the receiving channel 1011, such as the receiving channel 1011 having a stepped surface adapted to the stepped surface between the first shaft diameter section 1021 and the second shaft diameter section 1022, and the stepped surface between the first shaft diameter section 1021 and the second shaft diameter section 1022 abuts and seals with the stepped surface of the receiving channel 1011. The second shaft diameter section 1022 and the receiving channel 1011 form a first receiving portion 10111. The third shaft diameter section 1023 is used to install the coil 202, such as the coil 202. The gap between the sections ensures a more thorough potting of the coil 202; the fourth shaft section 1024 is used for a sealed connection with the bearing assembly 203 to prevent potting compound from entering the bearing assembly 203 and affecting the normal operation of the bearing; the fifth shaft section 1025 is used to install the bearing assembly 203; specifically, taking the bearing assembly 203 including a rolling bearing 2031, an upper bearing cover 2032, and a lower bearing cover 2033 as an example, the fourth shaft section 1024 is sealed to the lower bearing cover 2033, such as the lower bearing cover 2033 abutting and sealing the stepped surfaces between the fourth shaft section 1024 and the fifth shaft section 1025; the fifth shaft section 1025 is used to install the rolling bearing 2031; the upper bearing cover 2032 is installed on the side of the rolling bearing 2031 opposite to the lower bearing cover 2033 to seal the other side of the rolling bearing 2031 and prevent potting compound from entering.

[0058] Preferably, the stepped surface between the second shaft diameter segment 1022 and the third shaft diameter segment 1023 abuts against the end face of the iron core 201; the first receiving part 10111 connects to the space where the coil 202 is located through the passage 1017 provided on the second shaft diameter segment 1022. Since the iron core 201 abuts against the stepped surface between the second shaft diameter segment 1022 and the third shaft diameter segment 1023, it facilitates the installation and positioning of the iron core 201. Preferably, multiple protrusions 1026 are spaced circumferentially along the stepped surface of the second shaft diameter segment 1022; the protrusions 1026 abut against the end face of the iron core 201; adjacent protrusions 1026 and the iron core 201 together form the passage 1017; by forming the passage 1017 between the protrusions 1026, both the positioning and installation of the iron core 201 are achieved, and the passage 1017 is formed, simplifying the structure.

[0059] In some preferred embodiments, such as Figure 5 As shown, the mold body 101 includes an upper mold body 101a and a lower mold body 101b; the upper mold body 101a and the lower mold body 101b are detachably connected, such as by screw connection; and each has a receiving groove; the two receiving grooves together form a receiving channel 1011, and the surface where the groove opening of each receiving groove is located includes the axis of the receiving channel 1011, that is, each receiving groove is a half of the receiving channel 1011 along its axis; by setting the mold body 101 as a detachably connected upper mold body 101a and lower mold body 101b, demolding is convenient, residual potting compound is convenient to remove, and the tooling can be reused multiple times.

[0060] In some preferred embodiments, such as Figure 5 As shown, the upper mold body 101a and the lower mold body 101b are positioned by positioning pins 1019a and positioning holes 1019b; two positioning pins 1019a and two positioning holes 1019b can be provided respectively, preferably diagonally; preferably, four positioning pins 1019a and four positioning holes 1019b are provided respectively, evenly distributed along the circumference to obtain a better positioning effect.

[0061] In some preferred embodiments, such as Figure 1 and 3 As shown, the first receiving portion 10111 is configured as an annular structure, and the annular structure forms an installation space for the head bearing 500 of the motor; based on the fact that the installation position of the head bearing 500 is integrated on the motor functional component 200 and integrally formed by the potting tool 100, the coaxiality of the head bearing 500, the coil 202 and the bearing assembly 203 can be improved.

[0062] In some preferred embodiments, such as Figure 3As shown, one end of the bearing assembly 203 is connected to a high-pressure pipe 700; the other end of the high-pressure pipe 700 extends from the exhaust port 1013, and there is a gap between it and the exhaust port 1013. The high-pressure pipe 700 is used to deliver injection fluid into the bearing assembly 203. Taking the bearing assembly 203 as an example, which includes a rolling bearing 2031, an upper bearing cover 2032, and a lower bearing cover 2033, the lower bearing cover 2033 is located on the side of the rolling bearing 2031 near the coil 202, and the upper bearing cover 2032 is located on the other side of the rolling bearing 2031. One end of the high-pressure pipe 700 is connected to the upper bearing cover 2032, either directly connected to the upper bearing cover 2032, or a connector pipe is sealed and connected to the upper bearing cover 2032, and the high-pressure pipe 700 is connected to the connector pipe. The other end extends from the exhaust port 1013.

[0063] Example 2

[0064] This embodiment provides a potting process for manufacturing a motor functional component 200 using the potting fixture 100 of Embodiment 1. The motor functional component 200 includes an iron core 201, a coil 202, and a bearing assembly 203; specifically, it includes the following steps:

[0065] The motor core 201, coil 202, and bearing assembly 203 are mounted on the mold core 102; the core 201 is sleeved on the outside of the coil 202. Taking the bearing assembly 203, which includes a rolling bearing 2031, an upper bearing cover 2032, and a lower bearing cover 2033, as an example, the bearing assembly 203 is first assembled and then mounted on the mold core 102; when the solder pad 600 is provided, the leads of the coil 202 and the three-phase wires 800 of the motor are first soldered to the solder pad 600 and then mounted on the mold core 102.

[0066] Assemble the mold core 102 with the mold body 101;

[0067] Connect the injection port 1014 to the injection head of the injection device;

[0068] Place the potting fixture 100 in a vacuum device and evacuate the vacuum.

[0069] The potting compound is fed into the potting fixture 100 through the injection port 1014. The potting compound passes through the first receiving part 10111, the coil 202 and the third receiving part 10113 in sequence and fills the internal gaps, and then the feeding of the potting compound stops. The potting compound can be epoxy resin, which has good biocompatibility and corrosion resistance and can be used in motor potting.

[0070] After the potting compound in the potting fixture 100 has cured, the mold core 102 is extracted, the mold body 101 is removed, and the motor functional component 200 is obtained.

[0071] Due to the inherent characteristics of potting materials (such as epoxy resin), air bubbles are introduced during the mixing process, which in turn generate air bubbles during potting and curing. This results in air bubbles appearing on the exterior of the motor and inside the stator coil, ultimately leading to poor sealing. This can cause the following adverse consequences: a) Incomplete potting of the coil may lead to coil damage, and direct contact between the potting fluid and the coil does not meet biocompatibility requirements; b) Defects may appear in the potting of the motor exterior, resulting in a lower product yield. The potting process of this invention, based on performing the potting operation from bottom to top in a vacuum environment using the potting fixture 100, can effectively remove air bubbles from the potting compound (such as epoxy resin), resulting in a tighter filling of the potting compound. It can also effectively reduce the air bubble rate inside the molded motor, such as reducing the air bubble rate on the coil 202, improving the product qualification rate, and effectively reducing production costs.

[0072] Example 3

[0073] This embodiment provides a motor, such as Figure 6 and 7 As shown, it includes a motor functional component 200, a housing 300, and a rotor 400; the rotor 400 is located inside the motor functional component 200, and one end is mounted on the bearing assembly 203; the housing 300 covers the surface of the motor functional component 200; the motor functional component 200 is an integral structure formed by potting the iron core 201, the coil 202, and the bearing assembly 203 through the potting process of the above embodiment 2; preferably, the housing 300 is made of biocompatible material by machining; the housing 300 is bonded to the motor functional component 200 with a biocompatible adhesive such as 31CL (epoxy resin glue). The motor of the present invention uses a one-piece molded motor functional component 200, which is formed by potting only the portion within the outer surface of the iron core 201. This avoids the mold line problem present in potted housings. Furthermore, since potting is only performed within the outer surface of the iron core 201, the size of the motor can be reduced. Combined with a housing 300 covering the motor functional component 200, and the housing 300 being made of biocompatible material through machining, there are no mold lines, and it can directly contact blood, thus effectively avoiding the problem of low product yield caused by defects in the motor housing potting. Preferably, the motor also includes a head bearing 500, which is mounted on the motor functional component 200, such as by adhesive bonding; the other end of the rotor 400 is mounted on the head bearing 500, wherein the head bearing 500 can be a sliding bearing or a rolling bearing assembly identical to the bearing assembly 203.

[0074] In some preferred embodiments, such as Figure 6 As shown, the rotor 400 includes a rotating shaft 401 and a magnet 402. One end of the rotating shaft 401 is mounted on the bearing assembly 203, and the other end is mounted on the head bearing 500. The magnet 402 is sleeved on the rotating shaft 401.

[0075] In some preferred embodiments, such as Figure 7 As shown, the housing 300 includes a motor housing 301 and a tail cover 302; the motor housing 301 is a cylindrical housing with openings at the top and bottom, and is fitted onto the outer surface of the motor functional component 200; the tail cover 302 is a conical housing with openings at the top and bottom, and is fitted onto the side of the motor functional component 200 where the three-phase lines 800 of the motor are located.

[0076] In some preferred embodiments, such as Figure 7 As shown, the bearing assembly 203 includes a rolling bearing 2031, an upper bearing cover 2032, and a lower bearing cover 2033; the upper bearing cover 2032 and the lower bearing cover 2033 are respectively fastened to both sides of the rolling bearing 2031, and the upper bearing cover 2032 is away from the coil 202.

[0077] In some preferred embodiments, such as Figure 6 and Figure 7 As shown, it also includes a solder pad 600, such as a PCB board; the solder pad 600 is mounted on the upper end cover 2032 of the bearing, and the solder pad 600, the lead wire of the coil 202 and at least part of the three-phase wires 800 of the motor are encapsulated in the motor functional component 200; the lead wire of the coil 202 and the three-phase wires 800 of the motor are soldered to the solder pad 600; by introducing the solder pad 600, the convenience of soldering is improved, and the solder joints between the lead wire of the coil 202 and the three-phase wires 800 of the motor are also protected, effectively avoiding short circuits when injecting potting fluid.

[0078] In some preferred embodiments, the high blood pressure within the aorta can cause blood to enter the motor, forming a thrombus and causing the motor to stop, endangering the patient's life. A common solution to this problem is to use a liquid seal, where a perfusion fluid is injected from the motor's tail end to flush out the blood and prevent it from entering the motor. The perfusion fluid is typically a mixture of heparin and glucose. The fluid flows from the motor's tail end, through the bearings, and the gap between the motor rotor and stator, eventually entering the bloodstream. To achieve the above function, such as... Figure 6 and Figure 7 As shown, the motor also includes a high-voltage pipe 700; one end of the high-voltage pipe 700 is connected to the upper end cover 2032 of the bearing, and the other end is located outside the motor functional component 200; the high-voltage pipe 700 is used to provide injection fluid to the inside of the bearing assembly 203.

[0079] The embodiments of the present invention have been described above with reference to the accompanying drawings. However, the present invention is not limited to the specific embodiments described above. The specific embodiments described above are merely illustrative and not restrictive. Those skilled in the art can make many other forms under the guidance of the present invention without departing from the spirit and scope of the claims, and all of these forms are within the protection scope of the present invention.

Claims

1. A potting fixture for a hollow cup motor, the potting fixture being used to pot and encapsulate the motor core, a coil located inside the core, and a bearing assembly to form a single functional motor component, characterized in that, The potting fixture includes a mold body and a mold core; The mold body has a receiving channel that runs through both sides; one end of the receiving channel is an installation port, and the other end is an exhaust port; The mold core is used to install the motor functional components, and at least a portion of it can extend into the receiving channel through the mounting port and seal the mounting port. A second receiving portion for accommodating the iron core and the coil, as well as a first receiving portion and a third receiving portion located on both axial sides of the second receiving portion, are formed between the mold core and the receiving channel. The first receiving portion, the second receiving portion, the third receiving portion, and the exhaust port are arranged vertically from low to high; The first receiving section is connected to the injection port; The second receiving portion is configured to be in close contact with the iron core at least at both ends of the axial direction, such that the first receiving portion and the third receiving portion are connected only through the space where the coil is located; The third receiving portion is used to receive the bearing assembly and is connected to the exhaust port; The three-phase wires of the motor can be led out through the exhaust port.

2. The potting fixture for a hollow cup motor according to claim 1, characterized in that, The mounting port is located on the bottom surface of the mold body; the vent and the injection port are located on the top surface of the mold body.

3. The potting fixture for a hollow cup motor according to claim 1, characterized in that, The injection port is connected to the communication port on the first receiving part through the flow channel opened in the mold body; The flow channel includes a longitudinal section and a transverse section; One end of the longitudinal section is connected to the injection port, and the other end is connected to one end of the transverse section; The other end of the transverse segment is connected to the connecting port.

4. The potting fixture for a hollow cup motor according to claim 3, characterized in that, The area of ​​the connecting port is smaller than the cross-sectional area of ​​the other parts of the flow channel.

5. The potting fixture for a hollow cup motor according to claim 3, characterized in that, A buffer cavity is provided on the flow channel; the buffer cavity is wider than the flow channel; the buffer cavity is located on the side of the transverse section away from the first receiving part.

6. The potting fixture for a hollow cup motor according to claim 1, characterized in that, The bottom surface of the mold core is the placement surface of the potting fixture; the placement surface is provided with a fixing member; the fixing member is used to fix the position of the potting fixture during potting.

7. The potting fixture for a hollow cup motor according to claim 1, characterized in that, The portion of the mold core extending into the receiving channel is a columnar structure, and includes a first shaft diameter segment, a second shaft diameter segment, a third shaft diameter segment, a fourth shaft diameter segment, and a fifth shaft diameter segment whose diameter decreases sequentially along the direction from the mounting port to the vent port of the receiving channel and are coaxially connected. The first shaft diameter section is sealed to the receiving channel; The second shaft diameter section and the receiving channel form the first receiving portion; The third shaft diameter section is used to mount the coil; The fourth shaft diameter section is used for a sealed connection with the bearing assembly; The fifth shaft diameter section is used to install the bearing assembly.

8. The potting fixture for a hollow cup motor according to claim 7, characterized in that, The stepped surface between the second shaft diameter section and the third shaft diameter section abuts against the end face of the iron core; the first receiving part connects to the space where the coil is located through a passage provided on the second shaft diameter section; multiple protrusions are provided at intervals along the circumference of the second shaft diameter section on the stepped surface. The protrusion abuts against the end face of the iron core; adjacent protrusions and the iron core form the passageway.

9. The potting fixture for a hollow cup motor according to claim 1, characterized in that, The mold body includes an upper mold body and a lower mold body; The upper mold body and the lower mold body are detachably connected, and each has a receiving groove; The two receiving slots together form the receiving channel, and the surface where the opening of each receiving slot is located includes the axis of the receiving channel.

10. The potting fixture for a hollow cup motor according to claim 9, characterized in that, The upper mold body and the lower mold body are positioned by positioning pins and positioning holes.

11. A potting process for manufacturing a motor functional component using the potting tooling described in any one of claims 1-10, wherein the motor functional component includes an iron core, a coil, and a bearing assembly, characterized in that, Includes the following steps: The motor's iron core, coil, and bearing assembly are mounted on the mold core; Assemble the mold core with the mold body; Connect the injection port to the injection head of the injection device; Place the potting fixture in a vacuum device and evacuate the vacuum. The potting compound is fed into the potting fixture through the injection port. The potting compound passes through the first receiving part, the coil and the third receiving part in sequence and fills the internal gaps. Then the feeding of the potting compound stops. After the potting compound in the potting fixture has cured, the mold core is extracted, the mold body is removed, and the motor functional components are obtained.

12. An electric motor, characterized in that, Includes motor functional components, housing, and rotor obtained through the potting process described in claim 11; The rotor is located within the motor functional component, and one end is mounted on the bearing assembly; The housing covers the surface of the motor functional components; The motor functional components are an integral structure formed by potting iron core, coil and bearing components.

13. The motor according to claim 12, characterized in that, The housing includes a motor housing and a tail cover; The motor housing is a cylindrical housing with openings at the top and bottom, and is fitted onto the outer surface of the motor functional components; The tail cap is a conical shell with an opening at the top and bottom, and is fitted onto the side of the motor functional component where the three-phase lines of the motor are located.

14. The motor according to claim 12, characterized in that, The bearing assembly includes a rolling bearing, an upper bearing cover, and a lower bearing cover; The upper end cover and the lower end cover of the bearing are respectively fastened to both sides of the rolling bearing, and the upper end cover of the bearing is far away from the coil.

15. The motor according to claim 14, characterized in that, It also includes solder pads; the solder pads are mounted on the upper end cover of the bearing, and the solder pads, coil leads and at least a portion of the three-phase wires of the motor are encapsulated in the motor functional components; the coil leads and the three-phase wires of the motor are soldered to the solder pads.

Images