Lead-out wire sealing structure and preparation method thereof

Abstract

The invention is suitable for the technical field of motor outgoing line sealing, and provides an outgoing line sealing structure and a preparation method thereof. The lead-out wire sealing structure comprises a conductive piece, a sleeve and a sealing piece, the conductive piece is used for being electrically connected with an element in the motor, the conductive piece is sleeved with the sleeve, the sealing piece is installed on the sleeve, the sleeve is in sealing connection with a shell of the motor through the sealing piece, and the element is installed in the shell. The sleeve is integrally formed on the conductive part, the sleeve and the conductive part form an integrated structure, the sleeve is less likely to deform due to the influence of environmental factors and has good performance stability, no assembling gap exists between the sealing part and the conductive part, and the integrated structure formed by the sleeve and the conductive part is high in assembling reliability. And the sealing reliability of the outgoing line sealing structure is improved.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of the lead-out wire sealing of an electric machine, and particularly relates to a lead-out wire sealing structure and a preparation method thereof. BACKGROUND

[0002] In order to ensure the effective operation of the electric machine, the electric machine is usually designed as a fully-closed structure. However, the stator and / or the sensor and other internal elements are installed inside the machine base of the electric machine, and the electrical connection between the internal elements and external devices needs to be achieved through the lead-out wire. The lead-out wire is arranged through the machine base, and a through hole is left on the machine base, which may cause water and dust to enter the machine base. In order to reduce the possibility of dust, rainwater and other substances in the external environment entering the machine base through the through hole, the electric machine in the related art is provided with a sealing structure at the through hole to achieve the sealing connection between the lead-out wire and the machine base. However, in the related art, the performance stability of the sealing structure is poor, the assembly reliability between the components is poor, and the sealing structure cannot adapt to extreme environments such as high temperature, corrosion and high pressure, thereby affecting the sealing reliability of the sealing structure. SUMMARY

[0003] Therefore, the application provides a lead-out wire sealing structure and a preparation method thereof to solve the technical problem of how to improve the sealing reliability of the sealing structure.

[0004] To solve the above problems, the technical scheme provided by the embodiments of the application is as follows: The embodiments of the application provide a lead-out wire sealing structure, comprising: a conductive part for electrical connection with an element in an electric machine; a sleeve arranged outside the conductive part; a sealing part installed on the sleeve, the sleeve being sealingly connected with a housing of the electric machine via the sealing part, the element being installed in the housing; and wherein the sleeve is integrally formed on the conductive part.

[0005] In some embodiments, the conductive part is a copper bar for stator lead connection, one end of the copper bar being connected with the stator lead to connect with the stator of the electric machine through the stator lead along the axial direction of the sleeve, and the other end of the copper bar penetrating through the housing to the outside of the housing.

[0006] In some embodiments, one of the copper bar and the sleeve is provided with a boss in the radial direction of the sleeve, and the other of the copper bar and the sleeve is provided with a groove; wherein the boss and the groove are both arranged around the circumference of the sleeve, the boss being adapted to the groove and being inserted into the groove.

[0007] In some embodiments, a plurality of bosses and grooves are provided, each of the bosses being arranged at intervals along the axial direction of the sleeve, and each of the bosses being inserted into one of the grooves.

[0008] In some embodiments, a threaded hole is formed at one end of the copper bar along the axial direction of the sleeve, and the copper bar is screwed with the stator lead via the threaded hole; or, one end of the copper bar is welded with the stator lead along the axial direction of the sleeve.

[0009] In some embodiments, the copper bar extends in a round bar shape or a plate shape.

[0010] In some embodiments, the conductive member is a wire for connecting a sensor, and a plurality of wires are provided, and the sleeve covers each wire.

[0011] In some embodiments, the sealing member comprises: a plurality of sealing rings, each of which is mounted on the sleeve; the sealing ring is deformed between the sleeve and the shell and abuts against the shell; and a fastener is sleeved on the sleeve and located outside the shell.

[0012] In some embodiments, the fastener is screwed with the sleeve.

[0013] In some embodiments, a plurality of fasteners are provided along the axial direction of the sleeve, one of the fasteners abuts against the shell, and the remaining fasteners abut against each other.

[0014] In some embodiments, the sleeve comprises: a large-diameter portion located in the shell; a small-diameter portion connected to one end of the large-diameter portion and extending out of the shell and penetrating the fastener, the outer diameter of the small-diameter portion being smaller than the outer diameter of the large-diameter portion; wherein each of the sealing rings is provided on the large-diameter portion and abuts against the shell.

[0015] In some embodiments, each of the sealing rings comprises a first sealing ring and a second sealing ring, the large-diameter portion is provided with a first clamping groove and a second clamping groove, and the first clamping groove and the second clamping groove are circumferentially arranged along the sleeve; wherein the first clamping groove is arranged on one side of the large-diameter portion along the radial direction of the sleeve and is clamped with the first sealing ring; and the second clamping groove is arranged at one end of the large-diameter portion connected to the small-diameter portion along the axial direction of the sleeve and is clamped with the second sealing ring.

[0016] In some embodiments, the cross section of the first clamping groove and the second clamping groove is any one of a circle, a triangle and a trapezoid.

[0017] In some embodiments, in the radial direction of the sleeve, one side of the large-diameter portion connected to the sleeve is provided with a groove, the groove is circumferentially arranged along the sleeve, the conductive member is provided with a boss matched with the groove, and the boss is inserted into the groove.

[0018] The application also provides a preparation method applied to the preparation of the lead-out wire sealing structure, and the preparation method comprises the following steps: S1, processing a mold required for forming a sleeve; S2, arranging a conductive part in the mold; S3, using the mold to injection mold the sleeve on the conductive part; and S4, processing external threads on the sleeve and mounting a sealing part on the sleeve.

[0019] In some embodiments, the conductive part is a copper bar, and step S1 further comprises integrally processing the copper bar from a copper alloy.

[0020] In some embodiments, after the copper bar is formed, the copper bar is subjected to an electrodeposition treatment to form a plating layer on the surface.

[0021] In some embodiments, the conductive part is arranged as a lead wire for connecting a sensor, and a plurality of lead wires are arranged, and step S2 is to arrange the lead wires in parallel and at intervals in the mold.

[0022] In some embodiments, in step S3, the sleeve is injection molded in the mold from engineering plastic.

[0023] The lead-out wire sealing structure provided by the application comprises a conductive part, a sleeve and a sealing part. The conductive part is used to electrically connect with an element in a motor. The sleeve is integrally formed on the conductive part and is sleeved on the conductive part. The sealing part is mounted on the sleeve. The sleeve is sealingly connected with a shell of the motor via the sealing part. In this way, since the sleeve and the conductive part form an integrated structure, and the sleeve is sealingly connected with the shell via the sealing part, the sleeve does not need to rely on its elastic deformation to realize the sealing connection with the shell and the conductive part. The sleeve has a certain hardness, and the possibility of deformation of the sleeve due to environmental factors is small, and the sleeve has good performance stability. In addition, the sleeve is attached to the conductive part to form adhesion on the surface of the conductive part. There is no assembly gap between the sealing part and the conductive part, and the contact area between the sealing part and the conductive part is large, which increases the friction force between the sealing part and the conductive part. Therefore, the integrated structure of the sleeve and the conductive part has high assembly reliability. In summary, the integrated structure of the sleeve and the conductive part has high assembly reliability, and the sleeve itself has high performance stability, thereby improving the sealing reliability of the lead-out wire sealing structure. BRIEF DESCRIPTION OF DRAWINGS

[0024] Figure 1 A schematic view of the lead-out wire sealing structure provided by the application is assembled on a motor; Figure 2 A schematic view of the lead-out wire sealing structure provided by the first embodiment of the application; Figure 3 A right view of Figure 2 ; and Figure 4 The lead seal structure provided by the first embodiment of the present application is shown in Figure 3 the A-A direction in the figure and assembled on the motor; Figure 5 The sleeve provided by the embodiment of the present application is shown in Figure 3 the A-A direction in the figure; Figure 6 The conductive member provided by some embodiments of the present application is shown in Figure 3 the A-A direction in the figure; Figure 7 The conductive member provided by some other embodiments of the present application is shown in Figure 3 the A-A direction in the figure; Figure 8 The lead seal structure provided by the second embodiment of the present application is shown in Figure 9 The flow chart of the preparation method provided by the embodiment of the present application is shown in

[0025] Explanation of reference signs: 1, conductive member; 1a, copper bar; 11, boss; 12, threaded hole; 1b, wire; 2, sleeve; 21, channel; 22, groove; 23, large-diameter part; 231, first clamping groove; 232, second clamping groove; 24, small-diameter part; 3, sealing member; 31, sealing ring; 31a, first sealing ring; 31b, second sealing ring; 32, fastener; 32a, first fastener; 32b, second fastener; 10, housing; 101, through hole. DETAILED DESCRIPTION

[0026] In order to make the objectives, technical solutions and advantages of the present application clearer, the present application is further described in detail below in combination with the figures and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and do not limit the present application.

[0027] In the specific embodiments, each specific technical feature described can be combined in any suitable manner without contradiction, for example, different embodiments and technical solutions can be formed by the combination of different specific technical features. In order to avoid unnecessary repetition, various possible combinations of each specific technical feature in the present application are not described again.

[0028] In the following description, the terms "first", "second", "third", etc. are merely used to distinguish different objects, and do not indicate that there is the same or a relationship between the objects. It should be understood that the orientation description "upper", "lower", "outer", "inner", "left", "right" are the orientation in the normal use state, and the "left" and "right" directions are the left and right directions shown in the specific corresponding schematic diagram, which can be the left and right directions in the normal use state or can not be.

[0029] It should be noted that the terms "comprising", "including", or any other variant thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements not only includes those elements, but also includes other elements not explicitly listed, or further includes elements inherent to such a process, method, article or device. Without more limitations, the element defined by the statement "including a" does not exclude the presence of additional identical elements in the process, method, article or device including the element. "Multiple" means greater than or equal to two.

[0030] As shown in Figure 1 and Figure 2 , the embodiment of the application provides a lead-out wire sealing structure for sealing the lead-out wire of the motor and electrically connecting the elements connected with the lead-out wire. Specifically, the motor can be an oil-cooled motor cooled by circulating lubricating oil, a water-cooled motor cooled by circulating cooling water arranged inside the motor, an air-cooled motor forcedly cooled by air generated by a fan, or a naturally cooled motor cooled by natural convection by increasing the contact area with the surrounding air through heat sinks or heat fins. It should be noted that the type of motor in the embodiment of the application does not limit the specific structure of the lead-out wire sealing structure of the embodiment of the application.

[0031] In order to facilitate understanding, the lead-out wire sealing structure is applied to an oil-cooled motor as an example for explanation and description: As shown in Figure 1 and Figure 4 , the motor includes a stator (not shown in the figure), a rotor (not shown in the figure), a sensor (not shown in the figure), and a housing 10. The stator, rotor, and sensor are all installed in the housing 10, and the stator of the motor is located in a cooling oil cavity. When the lead-out wire of the motor is electrically connected with a device outside the housing 10, it needs to pass through the housing 10, and a through hole 101 is left on the housing 10. Since the motor has circulating cooling oil inside, the lead-out wire sealing structure is used to seal at the through hole 101 to achieve the sealing of the lead-out wire, so as to reduce the possibility of cooling oil leakage and the possibility of dust, rainwater and other substances in the external environment entering the housing 10 to affect the stability of the motor operation.

[0032] AsFigure 2 and Figure 3 As shown in The lead-out wire sealing structure provided by the embodiment of the present application comprises a conductive part 1, a sleeve 2 and a sealing part 3. The conductive part 1 is used to electrically connect with an element in the motor. The element can be a stator of the motor or a sensor inside the motor. The conductive part 1 can be directly connected with the element, or the conductive part 1 can be indirectly connected with the element through other components (such as a cable). Regardless of whether the conductive part 1 is directly connected with the element or indirectly connected with the element, as long as an electric circuit can be formed between the conductive part 1 and the element, the electrical connection can be achieved.

[0033] As shown in Figure 4 and Figure 5 The sleeve 2 is sleeved outside the conductive part 1. It can be understood that the sleeve 2 is generally a ring-shaped component. The sleeve 2 has a channel 21 capable of wrapping the conductive part 1. In the cross section perpendicular to the channel 21, the sleeve 2 has a circular outer contour (see Figure 3 Therefore, the sleeve 2 has an axial direction, a radial direction and a circumferential direction. The axial direction of the sleeve 2 is the direction of the axis of the channel 21 of the sleeve 2. The radial direction of the sleeve 2 is the direction of the diameter of the outer circumferential surface of the sleeve 2. The circumferential direction of the sleeve 2 is the direction around the axis, which is also the direction around which the outer circumferential surface of the sleeve 2 is wrapped.

[0034] As shown in Figure 2 and Figure 4 The sealing part 3 is installed on the sleeve 2. The sleeve 2 is sealingly connected with the housing 10 of the motor via the sealing part 3. That is, the sealing part 3 itself does not need to rely on its elastic deformation to achieve the sealing connection with the housing 10 and the conductive part 1. That is, the sleeve 2 has a certain hardness, which is different from the sealing glue with softness and toughness. In this way, compared with the general sealing glue, the sleeve 2 has a smaller possibility of swelling and deforming under high temperature, a smaller possibility of degrading under corrosion, a smaller possibility of deforming or failing due to high pressure, and the sleeve 2 itself has relatively stable performance, thereby reducing the possibility of sealing failure of the lead-out wire sealing structure under extreme environments such as high temperature, corrosion and high pressure.

[0035] As shown in Figure 2 and Figure 4As shown, the sleeve 2 is integrally formed on the conductive member 1. Specifically, after the conductive member 1 is formed, the sleeve 2 is directly wrapped around the conductive member 1 and is injected and shaped on the conductive member 1, and the sleeve 2 is tightly connected with the conductive member 1 to form an integrated structure. In this way, on the one hand, the assembly operation of the conductive member 1 and the sleeve 2 is not required, and the internal passage 21 of the sleeve 2 does not need to be larger than the diameter of the conductive member 1, and there is no need to reserve an assembly gap between the sleeve 2 and the conductive member 1, nor to set an elastic member between the sleeve 2 and the conductive member 1 to seal the sleeve 2 and the conductive member 1, and the sleeve 2 is tightly connected with the conductive member 1, reducing the possibility of the sleeve 2 and the conductive member 1 being loose. On the other hand, since the sleeve 2 is directly wrapped around the conductive member 1 and is injected and shaped on the conductive member 1, in addition to the friction between the sleeve 2 and the conductive member 1, there is also an adhesive force generated by the sleeve 2 during the shaping process, further improving the assembly reliability between the sleeve 2 and the conductive member 1, and reducing the possibility of the conductive member 1 being pulled off and separated from the sleeve 2.

[0036] The lead seal structure provided by the embodiment of the present application includes a conductive member 1, a sleeve 2 and a sealing member 3. The conductive member 1 is used to electrically connect with an element in the motor, the sleeve 2 is integrally formed on the conductive member 1 and is sleeved on the conductive member 1. The sealing member 3 is installed on the sleeve 2, and the sleeve 2 is sealingly connected with the shell 10 of the motor through the sealing member 3. In this way, since the sleeve 2 and the conductive member 1 form an integrated structure, and the sleeve 2 is sealingly connected with the shell 10 through the sealing member 3, the sleeve 2 does not need to rely on its own elastic deformation to achieve the sealing connection with the shell 10 and the conductive member 1, and the sleeve 2 has a certain hardness and is less likely to be deformed by environmental factors, thus having good performance stability. In addition, the sleeve 2 is attached to the conductive member 1 to be shaped, thus generating an adhesive force attached to the surface of the conductive member 1, and there is no assembly gap between the sealing member 3 and the conductive member 1, the contact area between the sealing member 3 and the conductive member 1 is large, and the friction between the sealing member 3 and the conductive member 1 is also increased. In this way, the integrated structure formed by the sleeve 2 and the conductive member 1 has high assembly reliability. In summary, the integrated structure formed by the sleeve 2 and the conductive member 1 has high assembly reliability, and the performance stability of the sleeve 2 itself is high, thus improving the sealing reliability of the lead seal structure.

[0037] In some embodiments, as shown in Figure 4 and Figure 6 The conductive member 1 is a copper bar 1a used to connect with a stator lead. It can be understood that in this implementation, the element mentioned above which is electrically connected with the conductive member 1 and is installed in the shell 10 is a stator, the stator is connected with a stator lead (not shown in the figure), and the stator and the conductive member 1 are connected through the stator lead to form a power supply circuit, that is, in this implementation, the stator and the conductive member 1 are indirectly in contact.

[0038] As shown in Figure 4 andFigure 6 As shown, along the axial direction of sleeve 2, one end of copper busbar 1a ( Figure 4 The left end of the copper busbar 1a shown is connected to the stator leads to connect to the stator of the motor via the stator leads. The other end of the copper busbar 1a ( Figure 4 The right end of the copper busbar 1a shown passes through the housing 10 to the outside of the housing 10. It can be understood that "one end of the copper busbar 1a" and "the other end of the copper busbar 1a" are the two opposite ends of the copper busbar 1a in the axial direction of the sleeve 2. Since the copper busbar 1a is made of copper, it has good conductivity and heat dissipation, improving the circuit stability connected to the stator leads. In addition, because the copper busbar 1a has good mechanical strength, it is also convenient to attach it to the sleeve 2, allowing the sleeve 2 to be injection molded, reducing the possibility of fatigue fracture of the lead wire sealing structure due to external pulling force.

[0039] In some embodiments, such as Figures 4-6 As shown, in the radial direction of the sleeve 2, one of the copper busbar 1a and the sleeve 2 is provided with a boss 11, and the other of the copper busbar 1a and the sleeve 2 is provided with a groove 22. Specifically, the copper busbar 1a may have a boss 11 protruding radially from the sleeve 2, and the sleeve 2 may have a groove 22 recessed radially; alternatively, the sleeve 2 may have a boss 11 protruding radially, and the copper busbar 1a may have a groove 22 recessed radially from the sleeve 2.

[0040] Both the boss 11 and the groove 22 are arranged around the circumference of the sleeve 2, that is, both the boss 11 and the groove 22 are annular. The boss 11 is adapted to the groove 22 and is inserted into the groove 22. In this way, the position of the sleeve 2 can be determined according to the position of the boss 11 or the groove 22 on the conductive component 1. The boss 11 or the groove 22 on the conductive component 1 defines the position of the sleeve 2, reducing the possibility of the conductive component 1 and the copper busbar 1a being misaligned. In addition, the boss 11 is inserted into the groove 22, which increases the contact area between the conductive component 1 and the sleeve 2. The groove wall of the groove 22 limits the boss 11, which also reduces the possibility of the conductive component 1 detaching from the sleeve 2, further improving the assembly reliability of the connection between the conductive component 1 and the sleeve 2.

[0041] In some embodiments, such as Figures 4-6As shown, the plurality of bosses 11 and the plurality of grooves 22 are provided, and each boss 11 is inserted into a groove 22 along the axial direction of the sleeve 2. That is, the plurality of bosses 11 and the plurality of grooves 22 are provided, and the number of bosses 11 is equal to the number of grooves 22. In this way, the plurality of bosses 11 are inserted into the corresponding grooves 22 along the axial direction of the sleeve 2, the number of limiting positions between the conductive member 1 and the sleeve 2 is increased, the contact area between the conductive member 1 and the sleeve 2 is further increased, the friction between the conductive member 1 and the sleeve 2 is improved, and the assembly reliability of the conductive member 1 and the sleeve 2 is further improved. In addition, the plurality of bosses 11 and the plurality of grooves 22 make the connection track between the conductive member 1 and the sleeve 2 a zigzag labyrinth path, increase the path between the conductive member 1 and the sleeve 2 to communicate the inside and outside of the shell 10, and increase the difficulty of dust or rainwater in the external environment entering the shell 10 through the conductive member 1 and the sleeve 2, thereby improving the sealing performance between the conductive member 1 and the sleeve 2, and improving the sealing reliability of the lead seal structure.

[0042] As shown in some embodiments, Figure 4 and Figure 6 along the axial direction of the sleeve 2, a threaded hole 12 is formed at one end of the copper bar 1a (the left end in the embodiment) Figure 4 , and the copper bar 1a is screwed with the stator lead via the threaded hole 12. It should be noted that in this embodiment, the stator lead can be an aluminum strip or a copper bar 1a. In this way, the copper bar 1a is screwed with the stator lead, the cost of positioning tooling required for welding is saved, and the assembly of the copper bar 1a and the stator lead does not require the use of other tools, thereby eliminating the need to reserve space for tool operation in the radial direction of the sleeve 2, and only the copper bar 1a or the stator lead needs to be screwed to achieve the assembly operation of the copper bar 1a and the stator lead, thereby reducing the space required for the assembly operation of the lead seal structure.

[0043] In other possible embodiments, the copper bar 1a and the stator lead can also be connected in other ways other than screwing. For example, as shown in Figure 7 along the axial direction of the sleeve 2, one end of the copper bar 1a (the left end in the embodiment) Figure 7 is welded with the stator lead. It should be noted that in this embodiment, the stator lead can be a flexible cable or a conductive column. In this way, the assembly stability between the copper bar 1a and the stator lead is higher, and the possibility of the copper bar 1a separating from the stator lead is reduced.

[0044] In some embodiments, as shown in Figures 2-4As shown, the copper bar 1a extends in a round bar shape or a plate shape. That is, with the radial direction of the sleeve 2 as the cross-sectional direction, the cross section of the copper bar 1a can be circular in the circumferential direction of the sleeve 2, so that the copper bar 1a extends in a round bar shape; or the cross section of the copper bar 1a can be quadrilateral in the circumferential direction of the sleeve 2, so that the copper bar 1a extends in a plate shape. It can be understood that, whether the copper bar 1a extends in a round bar shape or a plate shape, the copper bar 1a extends in the axial direction of the sleeve 2, that is, the length dimension of the copper bar 1a is in the axial direction of the sleeve 2. In this way, the length direction of the copper bar 1a is consistent with the length direction of the sleeve 2 (the axial direction of the sleeve 2), and the space utilization is high. In the embodiment in which the copper bar 1a extends in a round bar shape, the width dimension and the thickness dimension of the copper bar 1a are equal; in the embodiment in which the copper bar 1a extends in a plate shape, the thickness dimension of the copper bar 1a is smaller than the width dimension of the copper bar 1a.

[0045] In some embodiments, as shown in Figure 8 The conductive member 1 is a wire 1b for connecting the sensor, and the conductive member 1 includes a plurality of wires 1b, each of which is arranged in the sleeve 2. In this way, the mold required for injection molding of the sleeve 2 can be used as a preparation mold required for sealing of the stator, and also as a preparation mold required for sealing of the sensor.

[0046] Specifically, the wire 1b is a flexible cable, and the diameters of the wires 1b can be the same or different. It can be understood that, in this embodiment, the sleeve 2 integrally forms around each wire 1b, and the peripheral surface of each wire 1b is in contact with the sleeve 2, so that the contact area is large, the adhesion between the sleeve 2 and each wire 1b is large, and the assembly stability of the sleeve 2 and each wire 1b is improved. Moreover, the sleeve 2 integrally forms around a plurality of wires 1b connected to the sensor, which reduces the difficulty of wiring of the plurality of wires 1b, and can realize the connection of the plurality of wires 1b to the sensor at one time, thereby improving the measurement accuracy of the sensor and increasing the types of data that can be measured by the sensor.

[0047] In some embodiments, as shown in Figure 2 and Figure 4 The sealing member 3 includes a plurality of sealing rings 31 and a fastener 32, and each sealing ring 31 is mounted on the sleeve 2. The sealing ring 31 deforms between the sleeve 2 and the housing 10, and abuts against the housing 10, thereby achieving the sealed connection between the sleeve 2 and the housing 10. It can be understood that the sealing ring 31 has a certain elasticity, and can rely on deformation to seal the gap between the housing 10 and the sleeve 2, thereby sealing the through hole 101 provided on the housing 10 for connecting the lead wire to an external device, and further achieving the sealing of the lead wire, which is simple in structure and convenient to implement.

[0048] The fastener 32 is sleeved on the sleeve 2 and located outside the shell 10. Specifically, the fastener 32 can be clamped on the sleeve 2 in a clamping fit with the fastener 32; or the fastener 32 can be threadedly connected with the sleeve 2. The fastener 32 hoop-wraps the sleeve 2 in the circumferential direction of the sleeve 2, so that the peripheral surface of the sleeve 2 is pressed to be more tightly wrapped around the conductive member 1. And since the cross-sectional area of the fastener 32 in the radial direction of the sleeve 2 is larger than the cross-sectional area of the sleeve 2, the fastener 32 can block the dust, water droplets and other substances in the external environment from entering the shell 10 outside the shell 10, further improving the sealing performance of the lead seal structure.

[0049] In some embodiments, as shown in Figure 4 The fastener 32 is threadedly connected with the sleeve 2. By using the self-locking property of the thread, the possibility of separation of the fastener 32 from the sleeve 2 is reduced. And the fastener 32 is detachably connected with the sleeve 2, which is convenient for disassembly and assembly, facilitating the maintenance and replacement of the sleeve 2 and / or the fastener 32.

[0050] In some embodiments, as shown in Figure 4 The fastener 32 is threadedly connected with the sleeve 2. By using the self-locking property of the thread, the possibility of separation of the fastener 32 from the sleeve 2 is reduced. And the fastener 32 is detachably connected with the sleeve 2, which is convenient for disassembly and assembly, facilitating the maintenance and replacement of the sleeve 2 and / or the fastener 32.

[0051] In some embodiments, as shown in Figure 4 And Figure 5As shown, the sleeve 2 includes a large-diameter portion 23 and a small-diameter portion 24, with the outer diameter of the large-diameter portion 23 being larger than that of the small-diameter portion 24. The large-diameter portion 23 is located inside the housing 10, and one end of the small-diameter portion 24 is connected to the large-diameter portion 23, while the other end extends outside the housing 10 and is fitted with a fastener 32. It can be understood that at least a portion of the small-diameter portion 24 is located outside the housing 10, and the fastener 32 is installed on the portion of the small-diameter portion 24 located outside the housing 10. Each sealing ring 31 is disposed on the large-diameter portion 23, and the deformation of the sealing ring 31 can fill the gap between the sleeve 2 and the housing 10, achieving a seal. Furthermore, by installing the sealing ring 31 on the large-diameter portion 23 and the fastener 32 on the small-diameter portion 24, the sleeve 2 is divided into sections, allowing different components to be installed on different parts of the sleeve 2, making it easier for the user to intuitively determine the installation positions of the fastener 32 and the sealing ring 31.

[0052] In some embodiments, such as Figure 2 and Figure 4 As shown, each sealing ring 31 includes a first sealing ring 31a and a second sealing ring 31b. The large-diameter portion 23 has a first retaining groove 231 and a second retaining groove 232, both of which are arranged around the circumference of the sleeve 2. It can be understood that both the first retaining groove 231 and the second retaining groove 232 have an annular channel 21.

[0053] The first groove 231 is radially disposed on one side of the large-diameter portion 23 of the sleeve 2 and engages with the first sealing ring 31a; the second groove 232 is axially disposed at the end where the large-diameter portion 23 connects to the small-diameter portion 24 of the sleeve 2 and engages with the second sealing ring 31b. That is, the first groove 231 is disposed on the circumferential surface of the large-diameter portion 23, and the second groove 232 is disposed on the end face of the large-diameter portion 23, located on the end face where the large-diameter portion 23 connects to the small-diameter portion 24. It can be understood that, due to the diameter difference between the large-diameter portion 23 and the small-diameter portion 24, the end face where the large-diameter portion 23 connects to the small-diameter portion 24 is a stepped surface, and the second groove 232 is formed on this stepped surface. The first sealing ring 31a engages in the first groove 231 and abuts against the housing 10, thus achieving a radial seal on the large-diameter portion 23. The second sealing ring 31b engages in the second groove 232 and abuts against the housing 10, thus achieving an axial seal on the large-diameter portion 23. The large-diameter portion 23 is sealed both axially and radially, improving its sealing performance and thus enhancing the overall sealing performance of the lead wire sealing structure. Multiple sealing rings 31 provide sealing in multiple locations, ensuring that even in extreme environments, if the seal in one location fails, the seals in other locations remain unaffected, thus extending the service life of the lead wire sealing structure under extreme conditions.

[0054] Understandable, Figure 4 In the schematic diagram shown, the integrated structure formed by the sleeve 2 and the conductive component 1 passes through the through hole 101 of the housing 10 in a direction from left to right.

[0055] In some embodiments, as shown in Figure 2 and Figure 4 The channel 21 cross section of the first clamping groove 231 and the second clamping groove 232 is any one of a circle, a triangle and a trapezoid. That is, the channel 21 cross section of the first clamping groove 231 and the second clamping groove 232 can be a circle, can be a triangle, or can be a trapezoid. In the embodiment in which the channel 21 cross section of the first clamping groove 231 and the second clamping groove 232 is a circle, it is convenient for the first sealing ring 31a and the second sealing ring 31b to be installed more smoothly.

[0056] In the embodiment in which the channel 21 cross section of the first clamping groove 231 and the second clamping groove 232 is a triangle or a trapezoid, on the one hand, the included angle of the triangle and the trapezoid can be used to increase the complexity of the labyrinth path; on the other hand, the included angle of the triangle and the trapezoid can be used to limit the position of the sealing ring 31, thereby increasing the stability of the sealing ring 31 clamped in the clamping groove. Even if the sealing ring 31 is deformed and expands due to heat, it is not easy to come off the clamping groove, further improving the sealing performance of the lead-out wire sealing structure.

[0057] In some embodiments, as shown in Figures 4-6 In the radial direction of the sleeve 2, the large-diameter part 23 is provided with a groove 22 on the side connected to the sleeve 2, and the groove 22 is arranged along the circumferential direction of the sleeve 2, that is, the groove 22 is recessed on the peripheral surface of the sleeve 2 and has a closed peripheral surface. The conductive part 1 is provided with a boss 11 protruding and matched with the groove 22, and the boss 11 is inserted into the groove 22. In this embodiment, the conductive part 1 is a copper bar 1a, the copper bar 1a is provided with the boss 11 protruding in the radial direction of the sleeve 2, the large-diameter part 23 is recessed in the radial direction to form the groove 22, the boss 11 forms a positioning reference of the sleeve 2, which is convenient for judging the position of the sleeve 2. And the boss 11 is inserted into the groove 22, thereby increasing the contact area between the copper bar 1a and the sleeve 2, and improving the assembly stability of the copper bar 1a and the sleeve 2.

[0058] The embodiment of the present application also provides a preparation method, as shown in Figure 9 The preparation method is applied to the preparation of the lead-out wire sealing structure, and the preparation method comprises the following steps: S1: processing a mold required for forming the sleeve 2; S2: arranging the conductive part 1 in the mold; S3: using the mold to injection-mold the sleeve 2 on the conductive part 1; S4: processing an external thread on the sleeve 2, and installing the sealing part 3 on the sleeve 2.

[0059] Thus, the sleeve 2 is injection molded on the conductive member 1 using a mold, the sleeve 2 is wrapped around the conductive member 1 to be shaped, the sleeve 2 is tightly connected with the conductive member 1 to form an integrated structure. In this way, on the one hand, the assembly operation of the conductive member 1 and the sleeve 2 is not required, the assembly operation of the conductive member 1 and the sleeve 2 is simplified, and there is no need to reserve an assembly gap between the sleeve 2 and the conductive member 1, nor to set an elastic member for sealing between the sleeve 2 and the conductive member 1, the sleeve 2 is tightly connected with the conductive member 1, and the possibility of disengagement of the sleeve 2 and the conductive member 1 is reduced. On the other hand, in addition to the friction force between the sleeve 2 and the conductive member 1, there is also the adhesion force generated by the molding of the sleeve 2 on the conductive member 1, and the assembly reliability between the sleeve 2 and the conductive member 1 is high. In addition, the sleeve 2 does not need to rely on its own elastic deformation to realize the sealing connection with the shell 10 and the conductive member 1, the sleeve 2 has a certain hardness, the possibility of deformation of the sleeve 2 due to environmental factors is small, has good performance stability, and improves the sealing reliability of the lead seal structure.

[0060] It should be noted that in step S4, it is not required to install all components of the sealing member 3 on the sleeve 2 at one time. In the above embodiment in which the sealing member 3 includes the sealing ring 31 and the fastener 32, a plurality of sealing rings 31 can be first installed on the sleeve 2, and then the assembly is passed through the through hole 101 of the shell 10, and then the fastener 32 is locked on the portion (small diameter portion 24) of the sleeve 2 formed with external threads, to realize the assembly operation of the lead seal structure and the shell 10.

[0061] In some embodiments, as shown in Figure 6 and Figure 7 , the conductive member 1 is a copper bar 1a for connecting with the stator lead, and step S1 further includes integrally processing the copper bar 1a from the copper alloy. It can be understood that the copper bar 1a is electrically connected with the stator through the stator lead, and forms a power circuit. Using the copper bar 1a for conduction can realize stable transmission of signals by taking advantage of the excellent electrical conductivity of the copper alloy. The copper bar 1a is integrally processed, specifically, the copper bar 1a can be integrally formed with the boss 11 during the forming process to define the position of the sleeve 2; and the threaded hole 12 can also be integrally formed during the forming process to be threadedly connected with the stator lead, thus simplifying the post-processing process of the copper bar 1a.

[0062] In some embodiments, as shown in Figure 4As shown, step S1 further includes: after the copper bar 1a is formed, the copper bar 1a is subjected to an electrodeposition treatment to form a plating layer on the surface. Thus, after the sleeve 2 is formed in an integral structure with the conductive member 1 in step S3, the plating layer is located between the copper bar 1a and the sleeve 2, reducing the delamination of the copper bar 1a and the sleeve 2 due to the difference in material expansion coefficient and chemical composition, and the corrosion resistance of the plating layer can be utilized to more effectively reduce the possibility of the copper bar 1a being oxidized in a humid or corrosive environment, thereby prolonging the service life of the copper bar 1a; and the plating layer can prevent the copper surface from being oxidized and contaminants from being attached, thereby improving the reliability of the sleeve 2 in being attached to the conductive member 1 during the injection molding process. In some possible embodiments, the copper bar 1a is welded with the stator lead, and the plating layer can improve the performance of the copper bar 1a during the welding process, thereby ensuring the quality and stability of the welding.

[0063] In some other embodiments, as shown in Figure 8 the conductive member 1 is a lead 1b for connecting a sensor, and a plurality of leads 1b are provided, and step S2 includes passing each lead 1b through the mold in parallel and at intervals. The diameters of the leads 1b can be the same or different, but in general, the sleeve 2 can wrap a plurality of leads 1b at one time, and the sleeve 2 and the plurality of leads 1b together form an integral structure. After the integral structure is connected with an external circuit, signal transmission of one or more sensors connected with the plurality of leads 1b can be realized at one time, thereby reducing the wiring and sealing difficulty of the plurality of leads 1b.

[0064] In some embodiments, as shown in Figure 5 in step S3, the sleeve 2 is injection molded in the mold by using engineering plastics. The engineering plastics have excellent mechanical properties and can withstand greater loads and impacts, thereby improving the pressure resistance of the lead sealing structure. The engineering plastics can work in a wide temperature range and have good heat resistance, and are not prone to deformation or softening, thereby improving the reliability of the lead sealing structure in a high-temperature environment. The engineering plastics have excellent corrosion resistance to many chemical substances (such as acids, bases, and greases), thereby improving the reliability of the lead sealing structure in a corrosive environment. The engineering plastics have good wear resistance and fatigue resistance, thereby prolonging the service life of the sleeve 2. The engineering plastics have good dimensional stability and are not prone to deformation, thereby ensuring the dimensional accuracy of the sleeve 2 during the processing and use. In addition, the engineering plastics are easy to process and can be produced into various complex-shaped products by using various processing methods such as injection molding, extrusion, and thermoforming, thereby improving the reliability of the combination of the conductive member 1 and the sleeve 2.

[0065] The preferred embodiments of the present application have been described above with the preferred embodiments; however, all the modifications, equivalent replacements, and improvements made without departing from the spirit and principles of the present application shall fall within the protection scope of the present application.

Claims

1. A lead seal structure, characterized by, The utility model relates to a motor stator lead wire connection structure, including: Conductive piece for being electrically connected with the element in motor; Sleeve, sleeve is established in the conductive piece outside; Sealing element, install on the sleeve, the sleeve is sealedly connected with the casing of motor through the sealing element, the element is installed in the casing; Wherein, the sleeve is integrally formed on the conductive piece.

2. The lead seal structure of claim 1 wherein, The conductive piece is copper bar for stator lead wire connection, along the axial direction of the sleeve, one end of the copper bar is connected with the stator lead wire to be connected with the stator of the motor through the stator lead wire, the other end of the copper bar passes through the casing to the outside of the casing.

3. The lead seal structure of claim 2 wherein, In the radial direction of the sleeve, one of the copper bar and the sleeve is provided with a boss, and the other of the copper bar and the sleeve is provided with a groove. Wherein, the boss and the groove are both circumferentially arranged along the sleeve, the boss is adapted to the groove and is inserted into the groove.

4. The lead seal structure of claim 3 wherein, The boss and the groove are both provided with a plurality of, each boss is arranged in the axial direction of the sleeve, each boss is inserted into the groove.

5. The lead seal structure of claim 2 wherein, Along the axial direction of the sleeve, one end of the copper bar is provided with a threaded hole, and the copper bar is screwed with the stator lead wire through the threaded hole. Or, along the axial direction of the sleeve, one end of the copper bar is welded with the stator lead wire.

6. The lead seal structure of claim 2 wherein, The copper bar extends in a round bar or a plate.

7. The lead seal structure of claim 1 wherein, The conductive piece is a wire for connecting a sensor, and a plurality of wires are provided, and each wire is covered by the sleeve.

8. The pigtail seal structure according to any one of claims 1 to 6, wherein The sealing element includes: A plurality of sealing rings are provided, each of which is mounted on the sleeve; the sealing ring is deformed between the sleeve and the casing and abuts against the casing; The fastener is sleeved on the sleeve and located outside the casing.

9. The lead seal structure of claim 8 wherein, The fastener is screwed with the sleeve.

10. The lead seal structure of claim 8 wherein, A plurality of fasteners are provided along the axial direction of the sleeve, one of each of the fasteners abuts against the casing, and the remaining fasteners abut against each other.

11. The lead seal structure of claim 8 wherein, The sleeve includes: A large-diameter portion is located in the casing; A small-diameter portion is connected to the large-diameter portion at one end and extends out of the casing and through the fastener at the other end, and the outer diameter of the small-diameter portion is smaller than that of the large-diameter portion; Wherein, each of the sealing rings is arranged on the large-diameter portion and abuts against the casing.

12. The lead seal structure of claim 11 wherein, Each of the sealing rings includes a first sealing ring and a second sealing ring, the large-diameter portion is provided with a first clamping groove and a second clamping groove, and the first clamping groove and the second clamping groove are circumferentially arranged along the sleeve. Wherein, the first clamping groove is arranged on one side of the large-diameter portion in the radial direction of the sleeve and is clamped with the first sealing ring; the second clamping groove is arranged on the end of the large-diameter portion connected to the small-diameter portion in the axial direction of the sleeve and is clamped with the second sealing ring.

13. The lead seal structure of claim 12 wherein, The channel section of the first clamping groove and the second clamping groove is any one of a circle, a triangle, and a trapezoid.

14. The lead seal structure of claim 11 wherein, In the radial direction of the sleeve, one side of the large-diameter portion connected to the sleeve is provided with a groove, the groove is circumferentially arranged along the sleeve, the conductive piece is protrudingly provided with a boss adapted to the groove, and the boss is inserted into the groove.

15. A method of manufacture, characterized by, The application relates to a preparation method of the lead-out wire sealing structure in claim 1, and the preparation method comprises the following steps: S1, processing a mold required for forming a sleeve; S2, arranging a conductive part in the mold; S3, using the mold to injection mold the sleeve on the conductive part; S4, processing external threads on the sleeve, and installing a sealing part on the sleeve.

16. The method of claim 15, wherein, The conductive part is a copper bar, and step S1 further comprises integrally processing and forming the copper bar by using a copper alloy.

17. The method of claim 16, wherein, After the copper bar is formed, the copper bar is subjected to an electrodeposition treatment to form a plating layer on the surface.

18. The method of claim 15, wherein, The conductive part is arranged as a lead wire for connecting a sensor, and a plurality of lead wires are arranged, and step S2 is to arrange the lead wires in parallel and at intervals in the mold.

19. The method of claim 15, wherein, In step S3, the sleeve is injection molded by engineering plastics in the mold.

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