Wire sealing structure and rotary transformer

Abstract

The utility model discloses a conducting wire sealing structure and a rotary transformer, the conducting wire sealing structure comprises a conducting wire, a first sealing plug and a second sealing plug, and two ends of the conducting wire are respectively used for being connected with the rotary transformer and a control system. The first sealing plug wraps the wire in a sealing manner and is used for being installed on the sealing shell. And the second sealing plug hermetically wraps the wire and is positioned in the dry cavity. According to the wire sealing structure and the rotary transformer in the embodiment of the utility model, oil in the oil cavity can be prevented from leaking into the dry cavity through the first sealing plug, and the oil body can be prevented from leaking to each part in the dry cavity along the wire through the second sealing plug; and most of the wires between the rotary transformer and the control system are arranged in the dry cavity of the motor, so that the wires arranged in the oil cavity are reduced, and the requirement of a compact motor is met.

Description

Technical Field

[0001] The utility model belongs to the technical field of wire sealing, and particularly relates to a wire sealing structure and a resolver. Background Art

[0002] A resolver is a component used to measure the angular displacement and angular velocity of a rotating object and has wide applications in many fields. Especially in the field of new energy vehicles, resolvers are used to measure the angular displacement and angular velocity of the motor shaft.

[0003] In the oil-cooled electric drive system of new energy vehicles, the resolver is located in the oil cavity and is connected to the electric drive control system through wires. Most of the wires connected to the resolver are located in the oil cavity. Therefore, a sealing structure needs to be provided on the wires to prevent the oil from leaking through the wires to the electric drive control system.

[0004] With the continuous development of new energy vehicles, the requirements for motors are getting higher and higher, especially for compact motors. The compact motor has a smaller size and more compact internal component layout, and its oil cavity can no longer accommodate too many components. The wire layout method and wire sealing structure in the oil cavity are no longer applicable to compact motors.

[0005] The information disclosed in this background art section is only intended to enhance the overall understanding of the utility model and should not be regarded as an admission or any form of suggestion that this information constitutes prior art already known to those of ordinary skill in the art. Summary of the Utility Model

[0006] The purpose of the utility model is to provide a wire sealing structure, which is used to solve the problem that the wire layout method and wire sealing structure of the existing resolver are not applicable to compact motors.

[0007] To achieve the above purpose, a specific embodiment of the utility model provides a wire sealing structure, which is applied to a resolver connected to a motor. The motor includes an oil cavity and a dry cavity located outside the oil cavity. A sealing housing is provided at the junction of the oil cavity and the dry cavity. The resolver is installed in the oil cavity, and the control system is installed in the dry cavity. The wire sealing structure includes a wire, a first sealing plug, and a second sealing plug. The two ends of the wire are respectively used to connect to the resolver and the control system. The first sealing plug is hermetically wrapped around the wire and is used to be installed on the sealing housing. The second sealing plug is hermetically wrapped around the wire and is located in the dry cavity.

[0008] In one or more embodiments of the utility model, the first sealing plug includes a main body portion and a stop portion provided at one end of the main body portion. The main body portion is used to be hermetically inserted through the sealing housing, and the stop portion is used to abut against the side of the sealing housing close to the oil cavity.

[0009] In one or more embodiments of the present utility model, the second sealing plug includes an adhesive layer that wraps the wire, an insulating layer that wraps the adhesive layer, and a housing that wraps the insulating layer.

[0010] In one or more embodiments of the present utility model, the wire sealing structure includes a plurality of wires, and the second sealing plug includes a plurality of adhesive layers corresponding to the wires one by one, and the insulating layer wraps all the adhesive layers.

[0011] In one or more embodiments of the present utility model, a welding layer is wrapped on the wire core of the wire, and the adhesive layer wraps the welding layer.

[0012] In one or more embodiments of the present utility model, the welding layer is formed on the wire core of the wire by soldering, resistance welding, laser welding or ultrasonic welding.

[0013] In one or more embodiments of the present utility model, the housing is formed by injection molding.

[0014] In one or more embodiments of the present utility model, the insulating layer is formed by injection molding.

[0015] In one or more embodiments of the present utility model, the wire is connected to the stator of the resolver.

[0016] In one or more embodiments of the present utility model, the control system is an electric drive control system.

[0017] In another aspect of the present utility model, a resolver is further provided, and the resolver includes the above-mentioned wire sealing structure.

[0018] Compared with the prior art, the wire sealing structure of the present utility model, through the cooperatively arranged first sealing plug and second sealing plug, the first sealing plug seals and wraps the wire and is used for installation on the sealing housing to prevent the oil in the oil chamber from leaking into the dry chamber, and the second sealing plug seals and wraps the wire and is located in the dry chamber to prevent the oil from leaking along the wire to each part in the dry chamber, achieving the effect of double-layer sealing; in addition, in such a sealing structure, most of the wires between the resolver and the control system can be arranged in the dry chamber of the motor, reducing the wires arranged in the oil chamber, and meeting the requirements of a compact motor. Description of the Drawings

[0019] In order to more clearly illustrate the technical solutions in the embodiments of the present utility model or the prior art, the following will briefly introduce the drawings required for the description of the embodiments or the prior art. Obviously, the drawings in the following description are only some embodiments recorded in the present utility model. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0020] Figure 1 The plan view structure diagram of the wire sealing structure in an embodiment of the present utility model;

[0021] Figure 2 The plan view structure diagram of the wire sealing structure installed on the motor in an embodiment of the present utility model;

[0022] Figure 3 The sectional view structure diagram of the second sealing plug in an embodiment of the present utility model.

[0023] Main reference numeral description: 1, wire; 11, welding layer; 12, wire core; 13, outer skin; 2, first sealing plug; 21, main body part; 22, stop part; 3, second sealing plug; 31, glue layer; 32, insulating layer; 33, outer shell; 4, resolver; 5, control system; 6, oil cavity; 7, dry cavity; 8, sealing housing. Specific embodiments

[0024] In order to enable those skilled in the art to better understand the technical solutions in the present utility model, the following will clearly and completely describe the technical solutions in the embodiments of the present utility model with reference to the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all the embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without making creative efforts shall fall within the protection scope of the present utility model.

[0025] Refer to Figures 1 to 3 As shown, this embodiment provides a wire sealing structure, which is applied to a resolver 4 connected to a motor. The motor includes an oil cavity 6 and a dry cavity 7 located outside the oil cavity 6. A sealing housing 8 is provided at the junction of the oil cavity 6 and the dry cavity 7. The resolver 4 is installed in the oil cavity 6, and the control system 5 is installed in the dry cavity 7.

[0026] Specifically, the wire sealing structure in this embodiment includes a wire 1, a first sealing plug 2, and a second sealing plug 3. Both ends of the wire 1 are respectively used to connect to the resolver 4 and the control system 5. The first sealing plug 2 is hermetically wrapped around the wire 1 and is used to be installed on the sealing housing 8. The second sealing plug 3 is hermetically wrapped around the wire 1 and is located in the dry cavity 7.

[0027] According to the above structural design, when the sizes of the motor and its oil cavity 6 are reduced, most of the wire 1 between the resolver 4 and the control system 5 is arranged in the dry cavity 7, reducing the wire 1 arranged in the oil cavity 6 to adapt to a smaller-sized motor.

[0028] Moreover, the first sealing plug 2 can seal the part of the sealing housing 8 penetrated by the wire 1, preventing the oil in the oil chamber 6 from leaking along the wire 1 onto the various parts in the dry chamber 7 and ensuring the cleanliness of the various parts in the dry chamber 7. In addition, a second sealing plug 3 is provided on the wire 1 in the dry chamber 7 to prevent the oil in the oil chamber 6 from flowing along the wire 1 to the control system 5, realizing multi-layer sealing of the wire 1.

[0029] In addition, since the requirement for the cleanliness of the parts in the motor dry chamber 7 is relatively low, the cleaning process for the wire 1 and the second sealing plug 3 during the assembly process can be reduced, and the manufacturing cost can be lowered.

[0030] Refer to Figure 2 As shown, to improve the sealing effect of the first sealing plug 2, the first sealing plug 2 in this embodiment includes a main body portion 21 and a stop portion 22 provided at one end of the main body portion 21. The main body portion 21 is sealingly penetrated through the sealing housing 8, and the stop portion 22 abuts against the side of the sealing housing 8 close to the oil chamber 6.

[0031] The shapes and sizes of the main body portion 21 and the stop portion 22 can be adaptively adjusted according to the shape and size of the sealing housing 8 in the motor. Preferably, the main body portion 21 and the stop portion 22 can be set as cylinders.

[0032] The material of the first sealing plug 2 includes but is not limited to ethylene acrylic rubber, silicone rubber, acrylate rubber, nitrile rubber, and fluororubber.

[0033] Furthermore, other sealing structures can be formed on the outer surface of the first sealing plug 2 by spraying, welding, injection molding, etc. to improve the sealing performance at the connection between the first sealing plug 2 and the sealing housing 8.

[0034] Refer to Figure 3 As shown, to improve the sealing effect of the second sealing plug 3, a differentiated design is made for the second sealing plug 3 in this embodiment. Specifically, the second sealing plug 3 includes an adhesive layer 31 that wraps the wire 1, an insulating layer 32 that wraps the adhesive layer 31, and a housing 33 that wraps the insulating layer 32.

[0035] Preferably, the adhesive layer 31 can be set as a sleeve structure, and the insulating layer 32 and the housing 33 can be set as injection molding structures, specifically formed by injection molding on the sleeve.

[0036] During actual production, the sleeve-shaped adhesive layer 31 can be first sleeved on the wire 1, and then the wire 1 is placed in an injection mold, and the part of the wire 1 wrapped by the adhesive layer 31 is injection molded to form the insulating layer 32. Then the wire 1 is taken out of the injection mold, and then the wire 1 is placed in another injection mold, and the part of the wire 1 wrapped by the insulating layer 32 is secondary injection molded to form the housing 33.

[0037] The wire sealing structure in this embodiment includes a plurality of wires 1. The second sealing plug 3 includes a plurality of glue layers 31 corresponding to the wires 1 one by one, and the insulating layer 32 wraps all the glue layers 31 at the same time.

[0038] Referring to Figure 3 As shown, in order to further improve the sealing performance of the wire 1 and prevent the wire core 12 of the wire 1 from contacting the leaked oil, a welding layer 11 is wrapped on the wire core 12 of the wire 1 in this embodiment, and the glue layer 31 wraps the welding layer 11. The welding layer 11 is formed on the wire core 12 of the wire 1 by soldering, resistance welding, laser welding or ultrasonic welding.

[0039] During actual production, first, the outer skin 13 of the wire 1 is peeled off at the sealing position of the wire 1 to expose a certain length of the wire core 12, and then the gap between the exposed wire cores 12 is filled by the tinning process to form the welding layer 11.

[0040] Referring to Figure 3 As shown, in the axial direction of the wire 1, the length of the glue layer 31 in this embodiment is greater than the length of the welding layer 11, the length of the insulating layer 32 is less than the length of the glue layer 31, and the length of the outer shell 33 is greater than the length of the glue layer 31.

[0041] Specifically, the glue layer 31 completely wraps the welding layer 11, and both ends of the glue layer 31 extend to the outer skin 13 of the wire 1. The insulating layer 32 is wrapped on a part of the glue layer 31, and both ends of the glue layer 31 extend out from inside the insulating layer 32. The outer shell 33 completely wraps the glue layer 31 and the insulating layer 32, and both ends of the outer shell 33 extend to the outer skin 13 of the wire 1.

[0042] Preferably, the wire 1 in this embodiment is connected to the stator of the resolver 4.

[0043] Preferably, the control system 5 in this embodiment is an electric drive control system.

[0044] Those skilled in the art can understand that Figure 2 only the structures and positional relationships of the oil cavity 6 and the dry cavity 7 are schematically shown. In actual applications, the oil cavity 6 and the dry cavity 7 are not limited to the annular structure, and the dry cavity 7 is not limited to being arranged around the oil cavity 6.

[0045] Another embodiment of the present invention also provides a resolver, which includes the wire sealing structure in the above embodiment.

[0046] For those skilled in the art, it is obvious that the present utility model is not limited to the details of the above-described exemplary embodiments, and the present utility model can be implemented in other specific forms without departing from the spirit or basic characteristics of the present utility model. Therefore, from any point of view, the embodiments should be regarded as exemplary and non-limiting. The scope of the present utility model is defined by the appended claims rather than the above description. Therefore, all changes falling within the meaning and scope of the equivalent elements of the claims are intended to be embraced within the present utility model. Any reference signs in the claims should not be construed as limiting the claims involved.

[0047] In addition, it should be understood that although this specification is described according to embodiments, not every embodiment only contains an independent technical solution. This narrative manner of the specification is only for clarity. Those skilled in the art should regard the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. A wire sealing structure, which is applied to a rotary transformer (4) connected to a motor, the motor comprising an oil chamber (6) and a dry chamber (7) located outside the oil chamber (6), a sealing housing (8) being provided at the junction of the oil chamber (6) and the dry chamber (7), a rotary transformer (4) being installed in the oil chamber (6), and a control system (5) being installed in the dry chamber (7), characterized in that: The wire sealing structure comprises: A wire (1), two ends of which are respectively used to connect to the rotary transformer (4) and the control system (5); A first sealing plug (2) is sealed and wrapped around the wire (1) and is used for being installed on a sealing housing (8); The second sealing plug (3) is sealed and wrapped around the wire (1) and is located in the dry cavity (7).

2. The wire sealing structure according to claim 1, characterized in that: The first sealing plug (2) comprises a main body (21) and a stopper (22) arranged at one end of the main body (21); the main body (21) is used for sealingly penetrating the sealing housing (8); and the stopper (22) is used for abutting against a side of the sealing housing (8) close to the oil chamber (6).

3. The wire sealing structure according to claim 1, characterized in that: The second sealing plug (3) comprises a glue layer (31) wrapping the wire (1), an insulating layer (32) wrapping the glue layer (31), and a shell (33) wrapping the insulating layer (32).

4. The wire sealing structure according to claim 3, characterized in that: The wire sealing structure comprises a plurality of wires (1), the second sealing plug (3) comprises a plurality of glue layers (31) corresponding one to one to the wires (1), and the insulating layer (32) is wrapped around all the glue layers (31).

5. The wire sealing structure according to claim 3, characterized in that: The wire core (12) of the conductor (1) is wrapped with a welding layer (11), and the glue layer (31) wraps the welding layer (11).

6. The wire sealing structure according to claim 5, characterized in that: The welding layer (11) is formed on the wire core (12) of the wire (1) by soldering, resistance welding, laser welding or ultrasonic welding.

7. The wire sealing structure according to claim 3, characterized in that: The housing (33) is formed by injection molding; and / or, The insulating layer (32) is formed by injection molding.

8. The wire sealing structure according to claim 1, characterized in that: The wire (1) is connected to the stator of the rotary transformer (4).

9. The wire sealing structure according to claim 1, characterized in that: The control system (5) is an electric drive control system.

10. A rotary transformer, characterized in that: The invention comprises a wire sealing structure as claimed in any one of claims 1 to 9.

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