Filling and sealing tool of coreless motor, filling and sealing process and motor

Abstract

The invention relates to a potting tool of a hollow cup motor, a potting process and a motor. The potting tool comprises a mold body and a mold core, the mold body is provided with a containing channel penetrating through the two sides. One end of the accommodating channel is a mounting port; the other end is an exhaust port; the mold core is used for mounting a motor functional component, at least one part of the mold core can extend into the accommodating channel through the mounting opening and seal the mounting opening, and a second accommodating part for accommodating an iron core and a coil and a first accommodating part and a third accommodating part which are positioned on the two axial sides of the second accommodating part are formed between the mold core and the accommodating channel; the first accommodating part is communicated with the injection port; the second accommodating part is configured in a manner that at least parts corresponding to the two axial ends of the iron core are tightly attached to the iron core, so that the first accommodating part and the third accommodating part are communicated only through the space where the coil is located; the third accommodating part is used for accommodating the bearing assembly and is communicated with the exhaust port; the motor three-phase line can be led out through the exhaust port. The filling and sealing tool can avoid forming a joint line of the shell.

Description

Technical Field

[0001] The present invention relates to the technical field of medical devices, and in particular to a potting tool for a coreless cup motor, a potting process, and a motor. Background Art

[0002] During high-risk percutaneous coronary intervention (PCI), the patient's heart is relatively fragile, with insufficient blood supply, posing a high surgical risk. To address this, relevant companies have developed percutaneous interventional catheter pumps. Percutaneous ventricular assist devices (VADs) do not require open-chest surgery and can be implanted into the heart via minimally invasive methods such as femoral artery puncture or incision. Their main advantages include: ① Minimally invasive percutaneous implantation significantly reduces surgical risk; ② Entering the ventricle via the artery does not cause physical trauma to heart tissue, providing the patient with the possibility of recovering cardiac function. This advantage allows them to be used to maintain the vital signs of patients with severe heart failure or as an auxiliary treatment during high-risk PCI procedures.

[0003] The micromotor inside the catheter pump is the core component of the ventricular assist device. Its function is to generate pressure by driving the impeller through high-speed rotation, pumping blood from the left ventricle into the aorta, thereby ensuring that heart failure patients can still produce the required circulating blood flow in the case of insufficient cardiac function, thereby maintaining the vital signs of heart failure patients. Because it needs to be implanted into the left ventricle through the artery, the shell material of the micromotor in the body that is in direct contact with the human body needs to meet biocompatibility requirements, and the size requirements of the micromotor are relatively high, and the outer diameter generally cannot be larger than 21Fr / 7mm. At the same time, in order for the ventricular assist device to generate the necessary flow to maintain the patient's vital signs, the speed of the micromotor must be relatively high, generally reaching tens of thousands of revolutions per minute (rpm) under load conditions. Therefore, the design of the micromotor is crucial to the performance and safety of the ventricular assist device.

[0004] The micromotor needs to be placed in the aorta and in direct contact with blood, so the shell material surface must be smooth and biocompatible. On the other hand, the motor is a transmission component and it is difficult to achieve complete sealing. The motor stator is composed of coils, magnets, etc., and the biocompatibility of these materials is relatively poor. Therefore, potting technology can be used for sealing to prevent blood from directly or indirectly contacting materials such as coils and magnets.

[0005] The existing potting solution usually pots the entire motor shape. There will inevitably be a mold line when the mold is closed. It is difficult to achieve a particularly smooth level after post-processing because the motor casing is in direct contact with blood. In addition, improper processing will affect the product yield to a certain extent. Summary of the Invention

[0006] The invention discloses a potting tool for a coreless motor, a potting process and a motor, aiming to solve the technical problems existing in the prior art.

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

[0008] On the one hand, the present invention provides a potting tool for a hollow cup motor, which is used to pot the motor's iron core, the coil located inside the iron core, and the bearing assembly to form an integrated motor functional component. The potting tool includes a mold body and a mold core; the mold body has a accommodating channel running through both sides; one end of the accommodating 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 part can extend into the accommodating channel through the installation port and seal the installation port, and a second accommodating portion for accommodating the iron core and the coil, as well as a first accommodating portion and a third accommodating portion located on both axial sides of the second accommodating portion are formed between the mold core and the accommodating channel; the first accommodating portion is connected to the injection port; the second accommodating portion is configured to fit tightly with the iron core at least in the portion corresponding to the axial ends of the iron core, so that the first accommodating portion and the third accommodating portion are connected only through the space where the coil is located; the third accommodating portion is used to accommodate the bearing assembly and is connected to the exhaust port; the three-phase line of the motor can be led out through the exhaust port.

[0009] In the potting tooling of the hollow cup motor of the present invention, the installation port is located on the bottom surface of the mold body; the exhaust port and the injection port are located on the top surface of the mold body; the first accommodating portion, the second accommodating portion, the third accommodating portion and the exhaust port are arranged vertically from low to high.

[0010] In the potting tooling of the hollow cup motor of the present invention, the injection port is connected to the connecting port on the first accommodating portion through a 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 connecting port.

[0011] In the potting tool for the coreless motor of the present invention, the area of ​​the communication port is smaller than the cross-sectional area of ​​other parts of the flow channel.

[0012] In the potting tool for the coreless motor of the present invention, a buffer cavity is provided on the flow channel; the buffer cavity is wider than the flow channel; and the buffer cavity is provided on a side of the transverse section away from the first accommodating portion.

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

[0014] In the potting tooling of the hollow cup motor of the present invention, the part of the mold core extending into the accommodating channel is a columnar structure, and includes a first axial diameter section, a second axial diameter section, a third axial diameter section, a fourth axial diameter section and a fifth axial diameter section, the diameters of which decrease successively along the direction from the installation port to the exhaust port of the accommodating channel and are coaxially connected; the first axial diameter section is sealed and connected to the accommodating channel; the second axial diameter section and the accommodating channel form the first accommodating portion; the third axial diameter section is used to install the coil; the fourth axial diameter section is used to be sealed and connected to the bearing assembly; the fifth axial diameter section is used to install the bearing assembly.

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

[0016] In the potting tooling of the hollow cup motor 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 surface where the notch of each receiving groove is located includes the axis of the receiving channel.

[0017] In the potting tool for the coreless motor of the present invention, the upper mold body and the lower mold body are positioned by positioning columns and positioning holes.

[0018] In a second aspect, the present invention further provides a potting process for potting a motor functional component using the above-mentioned potting tool, wherein the motor functional component includes an iron core, a coil, and a bearing assembly, and the process comprises the following steps:

[0019] Install the motor's core, coil, and bearing assembly on the mold core;

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

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

[0022] Place the potting tool in a vacuum device and evacuate the vacuum;

[0023] The potting glue is fed into the potting tool through the injection port. The potting glue passes through the first accommodating portion, the coil and the third accommodating portion in sequence and fills the internal gaps. The feeding of the potting glue is stopped.

[0024] After the potting glue in the potting tooling is solidified, the mold core is pulled out and the mold body is removed to obtain the motor functional components.

[0025] In a third aspect, the present invention also provides a motor, comprising a motor functional component, a housing and a rotor obtained by the above-mentioned encapsulation process; the rotor is located in the motor functional component, and one end is mounted on the bearing assembly; the housing is coated on the surface of the motor functional component; the motor functional component is an integrated structure formed by encapsulating an iron core, a coil and a bearing assembly.

[0026] In the motor of the present invention, the housing includes a motor shell and a tail cover; the motor shell is a cylindrical shell with top and bottom openings, which is sleeved on the outer surface of the motor functional component; the tail cover is a conical shell with top and bottom openings, which is sleeved on the side of the motor functional component where the three-phase line of the motor is provided.

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

[0028] The motor of the present invention further includes a welding pad; the welding pad is installed on the upper end cover of the bearing, and the welding pad, coil lead wires and at least part of the motor three-phase wires are encapsulated in the motor functional component; the coil lead wires and the motor three-phase wires are welded to the welding pad.

[0029] The technical solution adopted by the present invention can achieve the following beneficial effects:

[0030] The present invention mainly provides a potting tool for a hollow cup motor, which is based on the close fit between the iron core and the inner wall of the second accommodating part, that is, the part outside the outer surface of the iron core is not potted, that is, the shell structure is not potted, thereby avoiding the problem of the mold line formed by the potting shell; and, based on the space for accommodating the coil to connect the first accommodating part and the third accommodating part, one-time potting molding is achieved, simplifying the potting process. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following briefly introduces the drawings required for describing the embodiments, which constitute a part of the present invention. The exemplary embodiments of the present invention and their descriptions are provided to explain the present invention and do not constitute an undue limitation of the present invention. In the drawings:

[0032] Figure 1 It is a structural schematic diagram of a potting tool for a coreless motor of the present invention;

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

[0034] Figure 3 It is a structural schematic diagram of a potting tool for a coreless motor of the present invention during potting;

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

[0036] Figure 5 Schematic diagram of the three-dimensional structure of a potting tool for a coreless motor according to the present invention;

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

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

[0039] Description of reference numerals:

[0040] 100. Potting tooling; 101. Mold body; 101a. Upper mold body; 101b. Lower mold body; 1011. Accommodation channel; 10111. First accommodating portion; 10112. Second accommodating portion; 10113. Third accommodating portion; 1012. Mounting port; 1013. Exhaust port; 1014. Injection port; 1015. Runner; 10151. Longitudinal section; 10152. Transverse section; 1016. Buffer cavity; 1017. Aisle; 1018. Communication port; 1019a. Positioning post; 1019b. Positioning hole; 102. Mold core; 1021. First axial diameter section; 1022. Second axial diameter section; 1023. Third axial diameter section; 1024. Fourth axial diameter section; 1025. Fifth axial diameter section; 1026. Protrusion;

[0041] 200. Motor functional components; 201. Iron core; 202. Coil; 203. Bearing assembly; 2031. Rolling bearing; 2032. Bearing upper end cover; 2033. Bearing lower end cover; 300. Housing; 301. Motor housing; 302. Tail cover; 400. Rotor; 401. Shaft; 402. Magnet; 500. Head bearing; 600. Solder pad; 700. High-voltage pipe; 800. Three-phase line. DETAILED DESCRIPTION

[0042] To make the objectives, technical solutions, and advantages of the present invention more clear, the technical solutions of the present invention will be clearly and completely described below in conjunction with specific embodiments of the present invention and corresponding drawings. In the description of the present invention, it should be noted that the term "or" is generally used in the sense of including "and / or" unless the content clearly indicates otherwise.

[0043] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or a magnetic connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be a connection between the two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to the specific circumstances. In addition, in the description of this application, the terms "first", "second", etc. are only used to distinguish the description, and cannot be understood as indicating or implying relative importance. In the description of the present invention, the meaning of "plurality" is at least two, such as two, three or more, etc., unless otherwise clearly specified and limited.

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

[0045] Obviously, the embodiments described are only some of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0046] In order to solve the problems existing in the prior art, the embodiments of the present application provide a potting tool, a potting process and a motor for a hollow cup motor.

[0047] Example 1

[0048] This embodiment provides a potting tool for a coreless motor, which is used to pot the motor's iron core 201, the coil 202 located inside the iron core 201, and the bearing assembly 203 to form an integrated motor functional component 200, wherein the bearing assembly 203 is arranged at the rear of the motor, which is the side of the motor connected to the external cable; Figures 1-4As shown, the potting tool 100 includes a mold body 101 and a mold core 102; the mold body 101 has an accommodating channel 1011 running through both sides; one end of the accommodating channel 1011 is a mounting port 1012, and the other end is an exhaust port 1013; the mold core 102 is used to install the motor functional component 200, and at least a part of it can be extended into the accommodating channel 1011 through the mounting port 1012, and the mounting port 1012 is sealed. When the mold core 102 is completely located in the accommodating channel 1011, its passage is closed. The mold core 102 is sealed with the inner wall of the accommodating channel 1011 through the side wall. When a part of the mold core 102 is located in the accommodating channel 1011, it can be optionally sealed with the inner wall of the accommodating channel 1011 through the side wall, or with the end of the accommodating channel 1011 through the part located outside the accommodating channel 1011; a second accommodating portion 10112 for accommodating the iron core 201 and the coil 202, and a first accommodating portion 101 located on both sides of the second accommodating portion 10112 are formed between the mold core 102 and the accommodating channel 1011. 11 and the third accommodating portion 10113; the first accommodating portion 10111 is connected to the injection port 1014; preferably, the injection port 1014 can be set to a shape that is compatible with the injection head of the injection device, such as a funnel-shaped structure; the second accommodating portion 10112 is configured to be closely fitted with the iron core 201 at least corresponding to the parts at both axial ends of the iron core 201, so that the first accommodating portion 10111 and the third accommodating portion 10113 are connected only through the space where the coil 202 is located, that is, the potting glue does not flow into the iron core 201 during potting. between the iron core 201 and the second accommodating portion 10112; preferably, the outer surface of the iron core 201 is tightly fitted with the inner wall of the second accommodating portion 10112; the third accommodating portion 10113 is used to accommodate the bearing assembly 203, and is connected to the exhaust port 1013, and there is a gap between the third accommodating portion 10113 and the outer surface of the bearing assembly 203 for the potting glue to pass through during potting; the three-phase line 800 of the motor can be led out through the exhaust port 1013, and the three-phase line 800 of the motor is used to connect with the external cable.

[0049] The potting tooling of a coreless motor of the present invention is based on the close fit between the iron core 201 and the inner wall of the second accommodating portion 10112, that is, the portion outside the outer surface of the iron core 201 is not potted, that is, the shell structure is not potted, thereby avoiding the problem of the joining line formed by the potting shell; and, based on the space for accommodating the coil 202 to connect the first accommodating portion 10111 and the third accommodating portion 10113, one-time potting molding is achieved, simplifying the potting process.

[0050] In some preferred embodiments, Figure 1 As shown, the side walls of the first accommodating portion 10111 , the second accommodating portion 10112 and the third accommodating portion 10113 are flush, so as to facilitate the subsequent installation of the shell.

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

[0052] In some preferred embodiments, Figure 1-Figure 3 As shown, the mounting port 1012 of the mold body 101 is set on the bottom surface of the mold body 101; the exhaust port 1013 and the injection port 1014 are set on the top surface of the mold body 101; the first accommodating portion 10111, the second accommodating portion 10112, the third accommodating portion 10113 and the exhaust port 1013 are arranged vertically from low to high, that is, the potting glue fills the gap between the accommodating channel 1011 and the iron core 201, the coil 202 and the bearing assembly 203 from bottom to top during potting; based on the bottom-up potting method, it is possible to have The bubble rate inside the motor after molding can be effectively reduced, such as reducing the bubble rate on the coil 202, thereby improving the qualified rate of the product and effectively reducing the production cost. Preferably, the accommodating channel 1011 is arranged to extend vertically, and the mold core 102 is coaxially arranged with the accommodating channel 1011 to realize that the first accommodating portion 10111, the second accommodating portion 10112, the third accommodating portion 10113 and the exhaust port 1013 are arranged in sequence from bottom to top. The injection port 1014 is arranged on the top surface of the mold body 101 to avoid overflow of the potting glue when the potting tool 100 is moved.

[0053] In some preferred embodiments, Figure 1 and 2 As shown, the injection port 1014 is connected to the connecting port 1018 on the first accommodating portion 10111 through the flow channel 1015 opened in the mold body 101; preferably, the flow channel 1015 is arranged adjacent to the accommodating 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 connecting port 1018.

[0054] Preferably, the area of ​​the communication 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 demoulding.

[0055] Preferably, if 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 provided on the side of the transverse section 10152 away from the first accommodating portion 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 the potting.

[0056] In some preferred embodiments, the bottom surface of the mold core 102 is the placement surface of the potting tool 100; the placement surface is provided with a fixing part (not shown); the fixing part is used to fix the position of the potting tool 100 during potting, such as fixing it on a table; the fixing part can be selected from magnets, suction cups or other existing devices that can achieve fixation, which will not be repeated here.

[0057] In some preferred embodiments, Figure 1 、 Figure 2 and Figure 4 As shown, the portion of the mold core 102 extending into the accommodating channel 1011 is a columnar structure, such as a cylindrical structure, and includes a first axial diameter section 1021, a second axial diameter section 1022, a third axial diameter section 1023, a fourth axial diameter section 1024 and a fifth axial diameter section 1025, which are coaxially connected and have decreasing diameters in the direction from the installation port 1012 to the exhaust port 1013 of the accommodating channel 1011; the first axial diameter section 1021 is sealedly connected to the accommodating channel 1011, such as the accommodating channel 1011 is provided with a step surface adapted to the step surface between the first axial diameter section 1021 and the second axial diameter section 1022, and the step surface between the first axial diameter section 1021 and the second axial diameter section 1022 is abutted and sealed with the step surface of the accommodating channel 1011; the second axial diameter section 1022 and the accommodating channel 1011 form a first accommodating portion 10111; the third axial diameter section 1023 is used to install the coil 202, such as with the coil 202 The clearance between them is matched so that the potting of the coil 202 is more thorough; the fourth axial diameter section 1024 is used to be sealed and connected with the bearing assembly 203 to prevent the potting glue from entering the interior of the bearing assembly 203 and affecting the normal operation of the bearing; the fifth axial diameter section 1025 is used to install the bearing assembly 203; specifically, the bearing assembly 203 includes a rolling bearing 2031, a bearing upper end cover 2032 and a bearing lower end cover 2033 as an example, wherein the fourth axial diameter section 1024 is sealed and connected with the bearing lower end cover 2033, such as the bearing lower end cover 2033 and the step surface between the fourth axial diameter section 1024 and the fifth axial diameter section 1025 are abutted and sealed; the fifth axial diameter section 1025 is used to install the rolling bearing 2031; the bearing upper end cover 2032 is installed on the side of the rolling bearing 2031 opposite to the bearing lower end cover 2033, and is used to seal the other side of the rolling bearing 2031 to prevent the potting glue from entering.

[0058] Preferably, the stepped surface between the second axial diameter section 1022 and the third axial diameter section 1023 abuts against the end face of the core 201; the first accommodating portion 10111 connects to the space where the coil 202 is located via a passage 1017 provided on the second axial diameter section 1022. The abutment between the core 201 and the stepped surface between the second axial diameter section 1022 and the third axial diameter section 1023 facilitates the installation and positioning of the core 201. Preferably, a plurality of protrusions 1026 are provided on the stepped surface at intervals along the circumference of the second axial diameter section 1022; the protrusions 1026 abut against the end face of the core 201; adjacent protrusions 1026 and the core 201 together form a passage 1017; the formation of the passage 1017 between the protrusions 1026 facilitates both the positioning and installation of the core 201 and the formation of the passage 1017, simplifying the structure.

[0059] In some preferred embodiments, 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 screwing; and each has a receiving groove; the two receiving grooves together form an receiving channel 1011, and the surface where the notch of each receiving groove is located includes the axis of the receiving channel 1011, that is, each receiving groove is a half that divides the receiving channel 1011 along its axis; based on the mold body 101 being set as a detachably connected upper mold body 101a and lower mold body 101b, demoulding is convenient, and residual potting glue is conveniently removed, thereby realizing multiple uses of the tooling.

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

[0061] In some preferred embodiments, Figure 1 and 3 As shown, the first accommodating portion 10111 is configured as an annular structure, and an installation space for the head bearing 500 of the motor is formed within the annular structure; based on integrating the installation position of the head bearing 500 into 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, Figure 3As shown, the bearing assembly 203 is connected to one end of the 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 the high-pressure pipe 700 and the exhaust port 1013, wherein the high-pressure pipe 700 is used to transport the perfusion fluid into the bearing assembly 203; the bearing assembly 203 includes a rolling bearing 2031, a bearing upper end cover 2032 and a bearing lower end cover 2033 as an example for explanation, wherein the bearing lower end cover 2033 is arranged on the side of the rolling bearing 2031 close to the coil 202, and the bearing upper end cover 2032 is provided with the rolling bearing 2031 on the other side, one end of the high-pressure pipe 700 is connected to the bearing upper end cover 2032, such as directly connected to the bearing upper end cover 2032, or, a joint pipe is sealed and connected on the bearing upper end cover 2032, the high-pressure pipe 700 is connected to the joint pipe, and the other end extends out of the exhaust port 1013.

[0063] Example 2

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

[0065] The motor's iron core 201, coil 202, and bearing assembly 203 are mounted on the mold core 102; the iron core 201 is sleeved over 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 assembled first and then mounted on the mold core 102. If a welding pad 600 is provided, the lead wires of the coil 202 and the motor's three-phase wires 800 are first welded to the welding 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 tool 100 in a vacuum device and evacuate the device;

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

[0070] After the potting glue in the potting tool 100 is solidified, the mold core 102 is pulled out, and the mold body 101 is removed to obtain the motor functional component 200.

[0071] Due to its own characteristics, the potting material (such as epoxy resin) will introduce bubbles during the glue adjustment process, and then bubbles will be generated during the glue filling and curing process, resulting in bubbles on the surface of the motor and inside the stator coil, which ultimately leads to poor sealing effect of the potting, which will produce the following adverse results: a. The coil is not completely potted, which will lead to the risk of coil damage, and the direct contact of the potting liquid with the coil does not meet the biocompatibility requirements; b. Defects will appear in the motor shape potting, resulting in a lower product yield. The potting process of the present invention is based on the potting operation of the potting tool 100 from bottom to top in a vacuum environment, which can effectively expel bubbles inside the potting glue (such as epoxy resin), making the potting glue fill more tightly, and can effectively reduce 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.

[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 shell 300 and a rotor 400; the rotor 400 is located in the motor functional component 200, and one end is installed on the bearing component 203; the shell 300 is coated on the surface of the motor functional component 200; the motor functional component 200 is an integrated structure formed by encapsulating the iron core 201, the coil 202 and the bearing component 203 through the encapsulation process of the above-mentioned embodiment 2; preferably, the shell 300 is made of biocompatible material by machining; the shell 300 is bonded to the motor functional component 200 by a biocompatible glue such as 31CL (epoxy resin glue). The motor of the present invention adopts an integrally formed motor functional component 200 and only potting the portion within the outer surface of the iron core 201 to obtain the motor functional component 200, thereby avoiding the problem of the mold line existing in the potting shell. Since only the outer surface of the iron core 201 is potted, the volume of the motor can be reduced. The motor functional component 200 is covered with a shell 300, and the shell 300 is made of a biocompatible material through machining. There is no mold line and it can directly contact blood, thereby effectively avoiding the problem of low product yield caused by defects in the potting of the motor shell. Preferably, the motor also includes a head bearing 500, which is mounted on the motor functional component 200, such as by gluing; the other end of the rotor 400 is mounted on the head bearing 500, wherein the head bearing 500 can be selected as a sliding bearing or a rolling bearing assembly similar to the bearing assembly 203.

[0074] In some preferred embodiments, 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, 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 top and bottom openings, which is sleeved on the outer surface of the motor functional component 200; the tail cover 302 is a conical housing with top and bottom openings, which is sleeved on the side of the motor functional component 200 where the three-phase line 800 of the motor is provided.

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

[0077] In some preferred embodiments, Figure 6 and Figure 7 As shown, it also includes a soldering pad 600, such as a PCB board; the soldering pad 600 is installed on the upper end cover 2032 of the bearing, and the soldering pad 600, the lead wires 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 wires of the coil 202 and the three-phase wires 800 of the motor are welded to the soldering pad 600; by introducing the soldering pad 600, the convenience of welding is improved, and at the same time, the soldering points between the lead wires of the coil 202 and the three-phase wires 800 of the motor are also protected, effectively avoiding short circuits when injecting the perfusion fluid.

[0078] In some preferred embodiments, due to the high blood pressure in the aorta, blood may enter the motor, forming a thrombus and causing the motor to stop, which may affect the patient's life safety. To solve this problem, a common solution is to use liquid sealing measures, that is, injecting perfusion liquid from the tail of the motor to hedge the blood and prevent blood from entering the motor. The perfusion liquid is generally a mixture of heparin and glucose. The liquid flows through the tail of the motor, through the bearing, and the gap between the motor rotor and stator, and then enters the blood. To achieve the above functions, Figure 6 and Figure 7 As shown, the motor further includes a high-pressure pipe 700 ; one end of the high-pressure pipe 700 is connected to the bearing upper end cover 2032 , and the other end is located outside the motor functional component 200 ; the high-pressure pipe 700 is used to provide perfusion fluid to the interior of the bearing component 203 .

[0079] The embodiments of the present invention are described above in conjunction with the accompanying drawings, but the present invention is not limited to the above-mentioned specific implementation methods. The above-mentioned specific implementation methods are merely illustrative and not restrictive. Under the guidance of the present invention, ordinary technicians in this field can also make many forms without departing from the scope of protection of the present invention and the claims, all of which are protected by the present invention.

Claims

1. A potting tool for a coreless motor, wherein the potting tool is used to pot the motor's iron core, the coil located inside the iron core, and the bearing assembly to form an integrated motor functional component, characterized in that: The potting tooling comprises a mold body and a mold core; The mold body has an accommodating channel running through both sides; one end of the accommodating channel is a mounting 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 accommodating channel through the installation opening and seal the installation opening. A second accommodating portion for accommodating the iron core and the coil, as well as a first accommodating portion and a third accommodating portion located on both axial sides of the second accommodating portion are formed between the mold core and the accommodating channel. The first accommodating portion is connected to the injection port; The second accommodation portion is configured to be closely fitted to the iron core at least at portions corresponding to both axial ends of the iron core, so that the first accommodation portion and the third accommodation portion are connected only through the space where the coil is located; The third accommodating 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.

2. The potting tool for the coreless motor according to claim 1, characterized in that: The installation port is located on the bottom surface of the mold body; the exhaust port and the injection port are located on the top surface of the mold body; the first accommodating portion, the second accommodating portion, the third accommodating portion and the exhaust port are arranged vertically from low to high.

3. The potting tool for the coreless motor according to claim 1, characterized in that: The injection port is connected to the communication port on the first accommodating portion through a flow channel provided 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.

4. The potting tool for the coreless motor according to claim 3, characterized in that: The area of ​​the communication port is smaller than the cross-sectional area of ​​other parts of the flow channel.

5. The potting tool for the coreless 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; and the buffer cavity is provided on a side of the transverse section away from the first accommodating portion.

6. The potting tool for the coreless motor according to claim 1, characterized in that: The bottom surface of the mold core is the placement surface of the potting tool; the placement surface is provided with a fixing piece; the fixing piece is used to fix the position of the potting tool during potting.

7. The potting tool for the coreless motor according to claim 1, characterized in that: The portion of the mold core extending into the accommodating channel is a columnar structure, and includes a first axial diameter section, a second axial diameter section, a third axial diameter section, a fourth axial diameter section, and a fifth axial diameter section, the diameters of which decrease sequentially along the direction from the installation opening to the exhaust opening of the accommodating channel and are coaxially connected; The first shaft diameter section is sealed and connected to the accommodating channel; The second shaft diameter section and the accommodating channel form the first accommodating portion; The third shaft diameter section is used for mounting the coil; The fourth shaft diameter section is used for sealing connection with the bearing assembly; The fifth shaft diameter section is used for mounting the bearing assembly.

8. The potting tool for the coreless motor according to claim 7, characterized in that: The step surface between the second axial diameter section and the third axial diameter section abuts against the end surface of the iron core; the first accommodating portion is connected to the space where the coil is located through a passage provided on the second axial diameter section; a plurality of protrusions are provided on the step surface at intervals along the circumference of the second axial diameter section; The protrusions abut against the end surface of the iron core; the adjacent protrusions and the iron core form the passage.

9. The potting tool for the coreless 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 accommodating grooves together form the accommodating channel, and the surface where the notch of each accommodating groove is located includes the axis of the accommodating channel.

10. The potting tool for the coreless motor according to claim 9, characterized in that: The upper mold body and the lower mold body are positioned by positioning columns and positioning holes.

11. A potting process for potting a motor functional component using the potting tool described in any one of claims 1 to 10, wherein the motor functional component comprises an iron core, a coil, and a bearing assembly, characterized in that: The steps include: Install the motor's core, coil, and bearing assembly on the mold core; Assemble the mold core and the mold body; Connect the injection port to the injection head of the injection device; Place the potting tool in a vacuum device and evacuate the vacuum; The potting glue is fed into the potting tool through the injection port. The potting glue passes through the first accommodating portion, the coil and the third accommodating portion in sequence and fills the internal gaps. The feeding of the potting glue is stopped. After the potting glue in the potting tooling is solidified, the mold core is pulled out and the mold body is removed to obtain the motor functional components.

12. A motor, characterized in that: The motor comprises a functional component, a housing and a rotor obtained by the potting process according to claim 11; The rotor is located in the motor functional assembly, and one end is mounted on the bearing assembly; The shell is covered on the surface of the motor functional component; The motor functional component is an integrated structure formed by potting the iron core, coil and bearing component.

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 on the top and bottom, and is sleeved on the outer surface of the motor functional component; The tail cover is a conical shell with top and bottom openings, and is sleeved on a side of the motor functional component where the three-phase wires of the motor are arranged.

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

15. The motor according to claim 14, characterized in that It also includes a welding pad; the welding pad is installed on the upper end cover of the bearing, and the welding pad, coil lead wires and at least part of the three-phase wires of the motor are encapsulated in the motor functional component; the lead wires of the coil and the three-phase wires of the motor are welded to the welding pad.

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