Pre-encapsulation mold and pre-encapsulation process for tail part of micro-motor and micro-motor

Abstract

The invention relates to a micro-motor tail pre-filling mold, a micro-motor tail pre-filling process and a micro-motor. The micro-motor comprises a motor main body and a filling pipeline, and one end of the filling pipeline is communicated with the interior of the motor main body; the pre-potting mold is used for potting and fixing the motor main body and the potting pipeline, and comprises a mold body; an accommodating part and a glue injection runner are arranged in the mold body; the accommodating part is used for accommodating the micromotor and is of a structure with two through ends, one end is a motor main body inlet, the other end is an extending port of the filling pipeline, at least one part of the inner wall of the accommodating part can be attached to a rear end cover module of the motor main body to form circumferential sealing, and the part, close to the extending port, of the accommodating part is a pre-filling mold cavity; the pre-potting mold cavity is communicated with the extending opening and is used for providing a glue injection space for potting and fixing the motor main body and the potting pipeline; and one end of the glue injection runner is a glue injection port, and the other end is communicated with the pre-encapsulation mold cavity. The connection strength of the motor main body and the filling pipeline is improved.

Description

Technical Field

[0001] This invention relates to the field of medical devices for cardiac interventional procedures, and more particularly to a pre-filling mold for the tail of a micro motor, a pre-filling process, and a micro motor. Background Technology

[0002] Interventional catheter pumps, as a treatment for end-stage heart failure and cardiogenic shock, are characterized by minimal invasiveness and low surgical risk. They restore cardiac function without causing physical damage to the heart and have good therapeutic effects on high-risk patients. The core component affecting the function of the left ventricular assist system catheter pump is a micromotor. By driving the micromotor to rotate at high speed, it drives the impeller to generate pressure, pumping blood from the left ventricle into the aorta. This ensures that heart failure patients still receive the necessary circulating blood flow to maintain their vital signs, even when cardiac function is insufficient.

[0003] Because the catheter pump needs to operate in the blood for extended periods, it must have an internal pathway to provide heparin perfusion. The micromotor is placed in the aorta and comes into direct contact with the blood. The perfusion fluid passes through the catheter pump's perfusion tubing, through the micromotor's interior, and finally enters the bloodstream from the front end of the micromotor. During perfusion, a certain perfusion pressure is required to counteract the blood flow and prevent blood from entering the micromotor during operation, which could cause embolism or blockage of the internal shaft. This necessitates a strong seal at the tail end of the micromotor to meet the required perfusion pressure.

[0004] Currently, micro-motor components are connected by adhesive bonding, which results in low connection strength and poses a risk of leakage at the motor tail if the injection pressure is high. Summary of the Invention

[0005] This invention discloses a pre-filling mold for the tail of a micro motor, a pre-filling process, and a micro motor, aiming to solve the technical problems existing in the prior art.

[0006] The present invention adopts the following technical solution:

[0007] In one aspect, the present invention provides a pre-filling mold for the tail of a micro motor, the micro motor including a motor body and a filling pipeline, one end of the filling pipeline being connected to the interior of the motor body; the pre-filling mold is used to fill and fix the motor body and the filling pipeline, the pre-filling mold including a mold body; the mold body has a receiving portion and an injection channel; the receiving portion is used to receive the micro motor and has a through-hole structure at both ends, one end being the inlet of the motor body and the other end being the outlet of the filling pipeline, at least a portion of the inner wall of the receiving portion can fit with the rear end cover module of the motor body to form a circumferential seal, the portion of the receiving portion near the outlet is a pre-filling mold cavity; the pre-filling mold cavity is connected to the outlet and is used to provide an injection space for filling and fixing the motor body and the filling pipeline; one end of the injection channel is an injection port, and the other end is connected to the pre-filling mold cavity.

[0008] In the pre-filling mold of the micro motor tail of the present invention, the mold body is provided with a glue storage tank, which is connected to the protrusion and is used to store the glue overflowing from the protrusion.

[0009] In the pre-filling mold of the micro motor tail of the present invention, the mold body has two receiving parts, namely a first receiving part and a second receiving part; the first receiving part and the second receiving part are respectively connected to the glue injection channel.

[0010] In the pre-filling mold of the micro motor tail of the present invention, the size of the opening of the glue injection channel connecting the pre-filling mold cavity is smaller than the flow area inside the glue injection channel.

[0011] In the pre-filling mold of the micro motor tail of the present invention, the glue injection channel includes a buffer cavity and a glue channel; one side of the buffer cavity is connected to the glue injection port, and the other side is connected to one end of the glue channel; the other end of the glue channel is connected to the pre-filling mold cavity.

[0012] In the pre-filling mold of the micro motor tail of the present invention, on the longitudinal section of the glue channel, the bottom edge of the glue channel extends horizontally and is at the same height as the bottom end of the pre-filling mold cavity, and the angle between the top edge and the bottom edge of the glue channel is α, where α = 5°.

[0013] In the pre-filling mold of the micro motor tail of the present invention, the micro motor further includes a rear cover, which is fastened to the side of the motor body connected to the injection pipeline; the shape of the inner wall of the pre-filling mold cavity is adapted to the shape of the inner wall of the rear cover of the micro motor.

[0014] In the pre-filling mold of the micro motor tail of the present invention, the pre-filling mold cavity includes a first bending section, a second bending section and a closing section in sequence along the direction from the motor body inlet to the outlet; the first bending section and the second bending section are both annular structures and are convex arc surfaces that gradually shrink along the direction from the motor body inlet to the outlet, and a part of the first bending section and / or the second bending section is adapted to the shape of the inner wall of the rear cover of the micro motor; the closing section is a cylindrical structure and communicates with the outlet.

[0015] In the pre-filling mold for the tail of the micro motor of the present invention, the micro motor further includes a front cover, which is installed on the motor body on one side relative to the filling pipeline; the pre-filling mold further includes a mandrel; the mandrel is used to block the inlet of the motor body, and the side of the mandrel facing the receiving portion has a first recess and a second recess; the first recess is adapted to the shape of the inner wall of the front cover of the micro motor; the second recess is located on the bottom surface of the first recess and is adapted to the shape of the rotating shaft of the motor body.

[0016] In the pre-filling mold for the tail of the micro motor of the present invention, the receiving portion includes, in sequence, a first cavity, a second cavity, and a third cavity along the direction from the inlet of the motor body to the outlet; the inner diameters of the first cavity, the second cavity, and the third cavity decrease sequentially; the first cavity is connected to the inlet of the motor body, and the third cavity is connected to the pre-filling mold cavity; the first cavity is used to receive the mandrel; the second cavity is used to receive the outer shell of the motor body; and the third cavity is used to receive the rear end cover module of the motor body.

[0017] In the pre-filling mold of the micro motor tail of the present invention, the injection port and the protrusion port are arranged on the same side and located on the top surface of the mold body; the motor body inlet is located on the bottom surface of the mold body.

[0018] In the pre-filling mold of the micro motor tail of the present invention, the inner surface of the mold body is coated with a polytetrafluoroethylene coating.

[0019] In the pre-filling mold of the micro motor tail of the present invention, the mold body includes an upper mold and a lower mold; the upper mold and the lower mold together form the receiving part and the injection channel.

[0020] In a second aspect, the present invention also provides a pre-filling process using the above-described pre-filling mold, comprising the following steps:

[0021] A protective layer is attached to the outer surface of the motor body;

[0022] Place the motor body and the injection pipe in the upper or lower mold, with the end of the injection pipe extending out from the outlet side;

[0023] After tidying up the conductive wires of the motor body, extend them from the protrusion side and fix them in place;

[0024] Install mandrel;

[0025] Assemble and fix the upper and lower molds;

[0026] The adhesive, comprising a two-component epoxy resin adhesive, is injected through a syringe from the injection port.

[0027] Demold after the glue has solidified.

[0028] In a third aspect, the present invention also provides a micro motor, which includes a motor body and an injection pipeline;

[0029] The motor body and the injection pipeline are sealed and fixed using the aforementioned pre-filling mold.

[0030] The technical solution adopted in this invention can achieve the following beneficial effects:

[0031] This invention mainly provides a pre-filling mold for the tail of a micro motor. Based on the configuration of the receiving part to fit the outer shell of the motor body to form a pre-filling mold cavity, the motor body and the filling pipeline are filled and molded in the pre-filling mold cavity, which improves the connection strength between the motor body and the filling pipeline, thereby improving the pressure resistance of the connection and reducing the risk of tail leakage. Attached Figure Description

[0032] 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:

[0033] Figure 1 This is a schematic diagram of the structure of a pre-filling mold for the tail of a micro motor according to the present invention;

[0034] Figure 2 This is a schematic diagram of the internal structure of a pre-filling mold for the tail of a micro motor according to the present invention;

[0035] Figure 3 For the present invention Figure 2 A magnified view of a portion of point E in the middle;

[0036] Figure 4 This is a schematic diagram of the mandrel structure of the present invention;

[0037] Figure 5 This is one of the schematic diagrams showing the assembly state of the upper and lower molds of the present invention;

[0038] Figure 6This is a schematic diagram showing the state of the micro motor of the present invention when it is installed in the upper mold or the lower mold;

[0039] Figure 7 This is a schematic diagram of the structure of the upper or lower mold of the present invention;

[0040] Figure 8 This is the second schematic diagram of the assembly state of the upper and lower molds of the present invention;

[0041] Figure 9 This is a schematic diagram of the micro motor of the present invention;

[0042] Figure 10 This is a schematic diagram of the motor body of the micro motor of the present invention.

[0043] Explanation of reference numerals in the attached figures:

[0044] 1. Mold body; 11. Receiving section; 11A. First receiving section; 11B. Second receiving section; 111. Motor body inlet; 112. Outlet; 113. Pre-filled mold cavity; 1131. First bending section; 1132. Second bending section; 1133. Closing section; 114. First cavity; 115. Second cavity; 116. Third cavity; 12. Injection channel; 121. Injection port; 122. Buffer cavity; 123. Glue channel; 13. Glue reservoir; 14. Upper mold; 15. Lower mold Mold; 16. Demolding groove; 17. Positioning pin; 18. Positioning hole; 2. Mandrel; 21. First recess; 22. Second recess; A. Motor body; A1. Rear end cover module; A11. Rear end cover body; A12. Rear bearing; A13. PCB board; A2. Magnet; A3. Shaft; A4. Stator coil; A5. Front bearing; A6. Housing; A7. Bushing; A8. Bearing protective sleeve; A9. Conduit protective sleeve; B. Injection pipeline; C. Tail cover; D. Front cover; F. Glue block; G. Three-phase wire. Detailed Implementation

[0045] 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.

[0046] 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.

[0047] 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.

[0048] 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.

[0049] To address the problems existing in the prior art, this application provides a pre-filling mold for the tail of a micro motor, a pre-filling process, and a motor.

[0050] Example 1

[0051] This embodiment provides a pre-filling mold for the tail section of a micro motor, such as... Figure 9 As shown, the micro-motor includes a motor body A and an injection pipe B. One end of the injection pipe B is connected to the interior of the motor body A. Specifically, one end of the injection pipe B is inserted into the rear end cover module A1, and the other end is connected to the interior of the motor body A. A pre-filling mold is used to fill and fix the motor body A and the injection pipe B. Specifically, it fills and fixes the rear end cover module A1 of the motor body A and the injection pipe B. Figure 1 and Figure 2As shown, the pre-filling mold includes a mold body 1; the mold body 1 has a receiving portion 11 and an injection channel 12; the receiving portion 11 is used to accommodate a micro motor and has a through-hole structure at both ends, one end being the motor body inlet 111 and the other end being the outlet 112 of the injection pipe B; preferably, the motor body inlet 111 and the outlet 112 are arranged opposite to each other, such as the outlet 112 being located on the top surface of the mold body 1 and the motor body inlet 111 being located on the bottom surface of the mold body 1; at least a portion of the inner wall of the receiving portion 11 can fit against the rear end cover module A1 of the motor body A to form a circumferential seal, and the portion of the receiving portion 11 near the outlet 112 is... The pre-filled mold cavity 113 is based on the side seal between the inner wall of the receiving part 11 and the rear end cover module A1 of the motor body A; the pre-filled mold cavity 113 is connected to the protrusion 112 and is used to provide a glue injection space for the motor body A and the injection pipe B to be filled and fixed, that is, after the micro motor is installed in the receiving part 11, the end of the motor body A, the injection pipe B, the three-phase line G and the pre-filled mold cavity 113 together define the space for containing glue; one end of the glue injection channel 12 is the glue injection port 121, and the other end is connected to the pre-filled mold cavity 113; preferably, the glue injection port 121 is on the same side as the protrusion 112, located on the top surface of the mold body 1, and not lower than the protrusion 112.

[0052] The present invention provides a pre-filling mold for the tail of a micro motor, which is based on setting the receiving part 11 to be adapted to the rear end cover module A1 of the motor body A to form a pre-filling mold cavity 113. The motor body A and the injection pipe B are filled and molded in the pre-filling mold cavity 113, which improves the connection strength between the motor body A and the injection pipe B, thereby improving the pressure resistance of the connection and reducing the risk of tail leakage.

[0053] In some preferred embodiments, such as Figure 2 As shown, the mold body 1 has a glue storage tank 13, which is connected to the protrusion 112 for storing glue overflowing from the protrusion 112. Preferably, the glue storage tank 13 is connected to the top of the protrusion 112, and is located adjacent to the protrusion 112 at the top of the mold body 1. The bottom surface of the glue storage tank 13 should be lower than the top of the protrusion 112 to facilitate the flow of overflowing glue. The glue storage tank 13 can receive excess glue overflowing from the protrusion 112, preventing glue from overflowing. This ensures that the glue fully fills the entire pre-filled mold cavity 113 while preventing excessive glue from overflowing from the closing section onto the conductive wires and high-voltage pipes, affecting the pre-filling effect and the fit between the motor body A and the tail cap C. Preferably, as shown... Figure 7 and Figure 9As shown, the axial distance between the glue storage tank 13 and the bottom end of the pre-filled mold cavity 113 connected to the protrusion 112 is H1 (that is, the distance to the rear end cover module A1, which is also equal to the axial height of the formed glue block F). The axial distance between the internal outlet of the sensor preset passage on the tail cover C and the rear end cover module A1 is H2, and H2 is greater than or equal to H1, so that the top of the pre-filled molded glue F after pre-filling is lower than the internal outlet M of the sensor preset passage on the motor tail cover, so as to ensure that the pre-filled molded glue and the sensor do not interfere with each other.

[0054] In some preferred embodiments, such as Figure 2 As shown, the mold body 1 has two receiving portions 11, namely a first receiving portion 11A and a second receiving portion 11B; the first receiving portion 11A and the second receiving portion 11B are respectively connected to the injection channel 12. For example, the injection channel 12 is arranged adjacent to the first receiving portion 11A and the second receiving portion 11B. Preferably, it is located between the first receiving portion 11A and the second receiving portion 11B, with one end connected to the injection port 121 and the other end including two branch channels, which are respectively connected to the first receiving portion 11A and the second receiving portion 11B; the first receiving portion 11A and the second receiving portion 11B can be exactly the same in size and shape, or they can be different in shape and size; preferably, the first receiving portion 11A and the second receiving portion 11B have the same shape and size, and are symmetrical about the injection channel 12. For example, if the injection channel 12 has an axially symmetrical structure, then the first receiving portion 11A and the second receiving portion 11B are... 11B is symmetrical about the axis of symmetry of the glue injection channel 12; based on the fact that the first receiving part 11A and the second receiving part 11B can pre-fill two micro motors at one time, the pre-filling efficiency can be improved; at this time, preferably, the mold body 1 is provided with a glue storage tank 13, such as the first receiving part 11A and the second receiving part 11B respectively being provided with glue storage tanks 13, so as to avoid the situation where glue overflows in one receiving part and is not filled in the other due to uneven glue flow when pre-filling the first receiving part 11A and the second receiving part 11B, thus ensuring the filling effect of the first receiving part 11A and the second receiving part 11B and that both can be fully filled with glue; specifically, the size and shape of the glue storage tank 13 connected to the first receiving part 11A and the glue storage tank 13 connected to the second receiving part 11B can be the same or different, depending on the working conditions.

[0055] In some preferred embodiments, such as Figure 2 and Figure 3 As shown, the size of the connection port of the glue injection channel 12 to the pre-filled mold cavity 113 is smaller than the flow area inside the glue injection channel 12, that is, the inlet of the glue injection channel 12 is large and the outlet is small; so as to achieve the purpose of glue accumulation and continuous injection into the pre-filled mold cavity 113.

[0056] In some preferred embodiments, such as Figure 2 and Figure 3As shown, the glue injection channel 12 includes a buffer cavity 122 and a glue channel 123; one side of the buffer cavity 122 is connected to the glue injection port 121, and the other side is connected to one end of the glue channel 123; the other end of the glue channel 123 is connected to the pre-filling mold cavity 113; based on the setting of the buffer cavity 122, the continuity of the filling is ensured. Preferably, the buffer cavity 122 is located at the top of the mold body 1; the glue channel 123 is connected to the pre-filling mold cavity 113 at the bottom of the pre-filling mold cavity 113, so that the glue flows from the bottom to the top during filling, reducing the bubble rate during filling; more preferably, the bottom surface of the buffer cavity 122 is not lower than the protrusion 112, so that the glue in the buffer cavity 122 can be completely filled.

[0057] Preferably, such as Figure 7 As shown, when the mold body 1 has symmetrical first receiving portion 11A and second receiving portion 11B, the buffer cavity 122 is arranged along the axis of symmetry of the first receiving portion 11A and the second receiving portion 11B. For example, the axis of symmetry of the first receiving portion 11A and the second receiving portion 11B extends vertically, and the extension direction of the first receiving portion 11A and the second receiving portion 11B is also vertical. The top of the buffer cavity 122 is connected to the injection port 121, and the bottom is connected to one end of the glue channel 123. There are two glue channels 123, namely the first glue channel 123A and the second glue channel 123B. The first glue channel 123A and the second glue channel 123B are related to... The first receiving portion 11A and the second receiving portion 11B are symmetrical about the axis of symmetry, and one end of each is connected to the bottom surface of the buffer cavity 122, and the other end is connected to the bottom of the first pre-filling mold cavity 113A of the first receiving portion 11A and the bottom of the second pre-filling mold cavity 113B of the second receiving portion 11B, respectively. The top of the first pre-filling mold cavity 113A is connected to the first outlet 112A, and the top of the second pre-filling mold cavity 113B is connected to the second outlet 112B. Therefore, during injection, based on the symmetrical arrangement of the first glue flow channel 123A and the second glue flow channel 123B, the glue flow rate injected into the first receiving portion 11A and the second receiving portion 11B is more uniform.

[0058] Preferably, the flow area of ​​the buffer cavity 122 is larger than the flow area of ​​the connection port between the buffer cavity 122 and the glue flow channel 123, thereby reducing the speed at which the glue flows from the buffer cavity 122 to the glue flow channel 123 and preventing the glue from overflowing from the outlet 112 due to excessive flow rate.

[0059] In some preferred embodiments, such as Figure 2 and Figure 3As shown, in the longitudinal section of the glue flow channel 123, the bottom edge of the glue flow channel 123 extends horizontally and is at the same height as the bottom of the pre-filling mold cavity 113. The angle between the top edge and the bottom edge of the glue flow channel 123 is α, where α = 5°. Based on this, it is ensured that during glue pouring, the glue flows upward from the bottom of the pre-filling mold cavity 113. Furthermore, based on the angle between the top edge and the bottom edge of the glue flow channel 123, the glue is gathered and continuously injected into the pre-filling mold cavity 113.

[0060] In some preferred embodiments, such as Figure 2 , Figure 3 and Figure 9 As shown, the micro motor also includes a tail cap C, which is fastened to the side of the motor body A connected to the injection pipe B. The inner wall shape of the pre-filling mold cavity 113 is adapted to the inner wall shape of the tail cap C of the micro motor; that is, after filling, it forms a shape adapted to the inner wall of the tail cap C. Thus, laser welding of the tail cap C to the outer shell of the motor body A can be achieved, that is, a seal is formed between the structure formed after filling and the tail cap C, preventing the glue used to fix the sensor from flowing to the joint between the outer shell of the motor body A and the tail cap C. If glue remains at the seam, it will cause blistering during laser welding. Preferably, the pre-filled mold cavity 113 includes a first bending section 1131, a second bending section 1132, and a closing section 1133 sequentially along the direction from the motor body inlet 111 to the outlet 112. The first bending section 1131 and the second bending section 1132 are both annular structures and are convex arc surfaces that gradually taper along the direction from the motor body inlet 111 to the outlet 112. The closing section 1133 is a cylindrical structure. It communicates with the protrusion 112; a portion of the first bent section 1131 and / or the second bent section 1132 is adapted to the shape of the inner wall of the tail cap C of the micro motor. In the glue block F formed after potting, the portion corresponding to the first bent section 1131 and the second bent section 1132 is attached to the inner wall of the tail cap C to provide support for the tail cap C and prevent the tail cap C from moving during the dispensing of glue to the optical fiber, thus affecting the optical fiber fixing effect; when the pre-filling mold cavity 113 is completely consistent with the shape of the inner wall of the tail cap C, due to potting or mold processing Errors during the process can cause difficulties in installing the tail cover C, resulting in an imperfect fit. By using the portion corresponding to the rubber block F formed by the first bending segment 1131 and / or the second bending segment 1132 to support the tail cover C, the installation of the tail cover C becomes more stable. Preferably, a portion of the first bending segment 1131 and the second bending segment 1132 is adapted to the shape of the inner wall of the tail cover C of the micro motor, and the portion corresponding to the rubber block F formed by the first bending segment 1131 and the second bending segment 1132 supports the tail cover C, resulting in more stable support.

[0061] In some preferred embodiments, such as Figures 4-9As shown, the micro motor also includes a front cover D, which is mounted on the motor body A on one side relative to the injection pipe B. The pre-filling mold also includes a mandrel 2. The mandrel 2 is used to seal the inlet 111 of the motor body. The side of the mandrel 2 facing the receiving part 11 has a first recess 21 and a second recess 22. The first recess 21 is adapted to the shape of the inner wall of the front cover D of the micro motor. The second recess 22 is located on the bottom surface of the first recess 21 and is adapted to the shape of the rotating shaft of the motor body A. Based on the setting of the mandrel 2, one side of the receiving part 11 is sealed to prevent glue overflow. Based on the setting of the first recess 21 and the second recess 22, a spacer structure is formed to avoid the risk of potting glue seeping into the front end of the micro motor and to ensure the normal installation of the front cover D. Preferably, the mandrel 2 is made of PTFE material to ensure smooth mold demolding and realize the reuse of the mold.

[0062] In some preferred embodiments, such as Figure 2 and Figure 7 As shown, the receiving part 11, along the direction from the motor body inlet 111 to the outlet 112, sequentially includes a first cavity 114, a second cavity 115, and a third cavity 116; the inner diameters of the first cavity 114, the second cavity 115, and the third cavity 116 decrease sequentially. The first cavity 114 is connected to the motor body inlet 111, and the third cavity 116 is connected to the pre-filled sealing cavity 113; the first cavity 114 is used to receive the mandrel 2; the second cavity 115 is used to receive the outer shell A6 of the motor body A; and the third cavity 116 is used to receive the rear end cover module A1 of the motor body A; The inner diameters of the first cavity 114, the second cavity 115, and the third cavity 116 decrease sequentially, forming a stepped structure that limits the micromotor and makes the potting position more accurate. Furthermore, since the second cavity 115 is designed to fit the outer shell A6 of the motor body A, i.e., to be fitted or abutted, it can further reduce the amount of adhesive entering the surface of the outer shell A6 of the motor body A, ensuring the smoothness of the surface of the outer shell A6 of the motor body A. Preferably, the first cavity 114, the second cavity 115, and the third cavity 116 are coaxial cylindrical structures.

[0063] In some preferred embodiments, such as Figure 2 As shown, the injection port 121 and the protrusion port 112 are located on the same side and on the top surface of the mold body 1; the motor body inlet 111 is located on the bottom surface of the mold body 1; based on this, when the pre-filled mold cavity 113 is filled, the glue flows from the bottom to the top of the pre-filled mold cavity 113, thereby improving the filling effect.

[0064] In some preferred embodiments, the inner surface of the mold body 1 is coated with a polytetrafluoroethylene coating to ensure smooth mold demolding and enable mold reuse; preferably, the mold body 1 is made of stainless steel, such as 304 / 316l, which is not magnetized, thus facilitating the installation of micro motors.

[0065] In some preferred embodiments, such as Figure 5 As shown, the mold body 1 includes an upper mold 14 and a lower mold 15; the upper mold 14 and the lower mold 15 together form a receiving part 11 and an injection channel 12. Based on setting the mold body 1 to include an upper mold 14 and a lower mold 15, it is convenient to install a micro motor.

[0066] Preferably, the upper mold 14 and / or the lower mold 15 have a demolding groove 16; preferably, the demolding groove 16 is located at a position adjacent to the junction of the upper mold 14 and the lower mold 15; preferably, the side of the demolding groove 16 adjacent to the junction position is a through side. For example, when the demolding groove 16 is provided on the upper mold 14, the side adjacent to the lower mold 15 is a through side. When it is provided on the lower mold 15, it is similar to the upper mold 14, and will not be described again.

[0067] Preferably, the upper mold 14 and the lower mold 15 are positioned by positioning pins 17 and positioning holes 18.

[0068] Preferably, the upper mold 14 and the lower mold 15 are fixed together by bolts.

[0069] In some preferred embodiments, the mold body 1 is made of stainless steel, such as 304 / 316L. Stainless steel is not magnetized, which facilitates the installation of micro motors.

[0070] Example 2

[0071] This embodiment provides a pre-filling process using the pre-filling mold in Embodiment 1 above, which includes the following steps:

[0072] A protective layer, such as 0.02mm polyimide tape, is affixed to the outer surface of the motor body A to protect the outer casing of the motor body A.

[0073] Place the motor body A and the injection pipe B in the upper mold 14 or the lower mold 15, with the end of the injection pipe B extending out from the protrusion 112 side.

[0074] The conductive wires of the motor body A, specifically the three-phase wires of the motor, are arranged and extended from the protrusion 112 side and fixed, such as fixed to an external fixing device or fixed to the injection pipeline B.

[0075] Install mandrel 2;

[0076] Assemble and fix the upper mold 14 and the lower mold 15;

[0077] Adhesive, comprising a two-component epoxy resin adhesive, is injected through injection port 121 using a syringe.

[0078] Demold after the glue has solidified.

[0079] The pre-filling process of this invention, on the one hand, fully protects the weak connection points at the tail of the motor by using glue potting, ensuring a good seal at the tail of the motor, meeting the required potting pressure, and effectively eliminating the hidden danger of leakage at the tail of the motor; on the other hand, after pre-filling, the tail cover C and the outer shell of the motor body A can be laser welded, enhancing the connection strength between the tail cover C and the outer shell, effectively avoiding glue adhesion problems, optimizing the product manufacturing process while improving product reliability.

[0080] Example 3

[0081] This embodiment provides a micro motor, such as Figure 9 As shown, it includes a motor body A and an injection pipe B;

[0082] The motor body A and the injection pipe B are fixed by the pre-filling mold in Embodiment 1. Specifically, the rear end cover module A1 of the motor body A is inserted into the injection pipe B. For example, the PCB board A13 of the rear end cover module A1 has a through hole for the injection pipe B to be inserted. One end of the injection pipe B extends into the through hole to connect to the inside of the motor body A. When the pre-filling mold in Embodiment 1 is used for filling, the glue flows into the gap between the injection pipe B and the through hole and fills the pre-filling mold cavity 113. After solidification, a glue block F is formed in the pre-filling mold cavity 113. The glue block F fixes the rear end cover module A1 to the injection pipe B and the three-phase line G to improve the connection strength between the rear end cover module A1 and the injection pipe B, thereby improving the sealing performance under high pressure conditions. At the same time, it strengthens the connection between the rear end cover module A1 and the three-phase line and reduces the possibility of the three-phase line G breaking or falling off.

[0083] In some preferred embodiments, the micro motor further includes a tail cover C and a front cover D; the tail cover C is located at the tail of the motor body A, i.e., on the side connected to the injection pipe B, and the front cover D is located on the motor body A and is positioned opposite to the tail cover C.

[0084] In some preferred embodiments, such as Figure 10As shown, the motor body A includes a rear cover module A1, a magnet A2, a shaft A3, a stator coil A4, a front bearing A5, and a housing A6. The magnet A2, shaft A3, and stator coil A4 are all located inside the housing A6, with the magnet A2 located inside the stator coil A4. The shaft A3 is inserted and fixed to the magnet A2. The front bearing A5 and the rear cover module A1 are inserted into the shaft A3 and arranged opposite to each other. The front bearing A5 is a sliding bearing and can also be used as the front cover C. The rear cover module A1 includes a rear cover body A11, a rear bearing A12, and a PCB board A13. The rear cover body A11 has a cylindrical structure, with the rear bearing A12 embedded on its far inner side. 2. A PCB board A13 is embedded on the inner side of the near end, and three wiring grooves are provided on the inner side wall for the three leads of the stator coil A4 to be led out. The leads are connected to the PCB board A13. A through hole is provided on the PCB board A13. One end of the injection pipe B is inserted into the through hole and sealed after being filled by the pre-filling mold of Example 1. One end of the motor three-phase line G is provided on the PCB board A13, and the other end is led out from the tail cover C of the micro motor and connected to the external power supply. When the motor is filled, the injection liquid flows into the micro motor through the injection pipe B, then enters the gap outside the magnet A2 through the rear bearing A12, and finally flows out through the gap between the front bearing A5 and the shaft A3.

[0085] In some preferred embodiments, the motor body A further includes a bushing A7, a bearing protective sleeve A8, a conduit protective sleeve A9, and a gasket A101; wherein, the bushing A7 is disposed on the inner surface of the stator coil A4 and is fixedly connected, and is made of a biocompatible material, such as PI material; the bearing protective sleeve A8 is disposed between the PCB board A13 and the rear bearing A12 to protect the rear bearing A12 from glue entering the rear bearing A12; one end of the conduit protective sleeve A9 is disposed inside the injection pipe B, and the two are inserted and fixed, and the other end is inserted into the through hole of the PCB board A13 and fixedly connected by glue, that is, the conduit protective sleeve A9 is pre-fixed to the PCB board A13, and then the injection pipe B is inserted into the conduit protective sleeve A9 to improve the installation efficiency; the gasket A101 is sandwiched between the stator coil A4 and the rear bearing A12 to position the rear end cover module A1. 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 pre-filling mold for the tail of a micro motor, the micro motor comprising a motor body and a filling pipeline, one end of the filling pipeline being connected to the interior of the motor body; the pre-filling mold being used to fill and fix the motor body and the filling pipeline, characterized in that, The pre-filled mold includes a mold body; The mold body has a receiving part and a glue injection channel; The receiving part is used to accommodate the micro motor and has a through-hole structure at both ends, one end being the motor body inlet and the other end being the outlet of the injection pipeline. At least a portion of the inner wall of the receiving part can fit with the rear end cover module of the motor body to form a circumferential seal. The portion of the receiving part near the outlet is a pre-filling mold cavity. The pre-filling mold cavity is connected to the outlet and is used to provide an injection space for the motor body and the injection pipeline to be filled and fixed. One end of the injection channel is the injection port, and the other end is connected to the pre-filled mold cavity.

2. The pre-filling mold for the tail section of the micro-motor according to claim 1, characterized in that, The mold body is provided with a glue storage tank, which is connected to the protrusion and is used to store the glue overflowing from the protrusion.

3. The pre-filling mold for the tail of the micro-motor according to claim 2, characterized in that, The mold body has two receiving portions, namely a first receiving portion and a second receiving portion; the first receiving portion and the second receiving portion are respectively connected to the injection channel.

4. The pre-filling mold for the tail section of the micro-motor according to any one of claims 1-3, characterized in that, The size of the opening connecting the injection channel to the pre-filled mold cavity is smaller than the flow area within the injection channel.

5. The pre-filling mold for the tail section of the micro-motor according to any one of claims 1-3, characterized in that, The glue injection channel includes a buffer chamber and a glue channel; The buffer cavity is connected to the glue injection port on one side and to one end of the glue flow channel on the other side; The other end of the glue channel is connected to the pre-filled mold cavity.

6. The pre-filling mold for the tail section of the micro-motor according to claim 5, characterized in that, In the longitudinal section of the glue channel, the bottom edge of the glue channel extends horizontally and is at the same height as the bottom of the pre-filled mold cavity. The angle between the top edge and the bottom edge of the glue channel is α, where α = 5°.

7. The pre-filling mold for the tail section of the micro-motor according to claim 1, characterized in that, The micro motor also includes a rear cover, which is fastened to the side of the motor body connected to the injection pipeline; the shape of the inner wall of the pre-filled mold cavity is adapted to the shape of the inner wall of the rear cover of the micro motor.

8. The pre-filling mold for the tail section of the micro-motor according to claim 7, characterized in that, The pre-filled mold cavity includes, in sequence, a first bending section, a second bending section, and a closing section along the direction from the inlet of the motor body to the outlet; Both the first bending segment and the second bending segment are annular structures and are convex arc surfaces that gradually taper from the motor body inlet to the outlet. A portion of the first bending segment and / or the second bending segment is adapted to the shape of the inner wall of the back cover of the micro motor. The constricted section has a cylindrical structure and is connected to the protruding opening.

9. The pre-filling mold for the tail of the micro-motor according to claim 1, characterized in that, The micro motor also includes a front cover, which is mounted on the motor body on one side relative to the infusion pipeline; The pre-filled mold also includes a mandrel; The mandrel is used to block the motor body inlet, and the side of the mandrel facing the receiving part has a first recess and a second recess; The first recess is adapted to the shape of the inner wall of the front cover of the micro motor; The second recess is located on the bottom surface of the first recess and is adapted to the shape of the rotating shaft of the motor body.

10. The pre-filling mold for the tail section of the micro-motor according to claim 9, characterized in that, The receiving portion, along the direction from the inlet of the motor body to the outlet, sequentially includes a first cavity, a second cavity, and a third cavity; The inner diameters of the first cavity, the second cavity, and the third cavity decrease sequentially. The first cavity is connected to the inlet of the motor body, and the third cavity is connected to the pre-filled sealing cavity. The first cavity is used to accommodate the mandrel; The second cavity is used to house the outer casing of the motor body; The third cavity is used to accommodate the rear end cover module of the motor body.

11. The pre-filling mold for the tail section of the micro-motor according to any one of claims 1-3 and 6-10, characterized in that, The injection port and the protrusion are located on the same side and on the top surface of the mold body; The motor body inlet is located on the bottom surface of the mold body.

12. The pre-filling mold for the tail section of the micro-motor according to any one of claims 1-3 and 6-10, characterized in that, The inner surface of the mold body is coated with polytetrafluoroethylene.

13. The pre-filling mold for the tail section of the micro-motor according to any one of claims 1-3 and 6-10, characterized in that, The mold body includes an upper mold and a lower mold; The upper mold and the lower mold together form the receiving part and the injection channel.

14. A pre-filling process using a pre-filling mold according to any one of claims 1-13, characterized in that, Includes the following steps: A protective layer is attached to the outer surface of the motor body; Place the motor body and the injection pipe in the upper or lower mold, with the end of the injection pipe extending out from the outlet side; After tidying up the conductive wires of the motor body, extend them from the protrusion side and fix them in place; Install mandrel; Assemble and fix the upper and lower molds; The adhesive, comprising a two-component epoxy resin adhesive, is injected through a syringe from the injection port. Demold after the glue has solidified.

15. A micro motor, characterized in that, Including the motor body and the injection pipeline; The motor body and the injection pipeline are sealed and fixed by the pre-filling mold described in any one of claims 1-13.

Images