Motor terminal insulation structure and compressor

Abstract

The application provides a motor terminal insulation structure, which comprises an insulation main body, a terminal and a lead wire, the insulation main body is internally provided with a terminal containing cavity, the terminal is arranged in the terminal containing cavity and electrically connected with the lead wire, the motor terminal insulation structure further comprises an insulation piece and an insulation sealant layer; wherein one end of the insulation main body is provided with an opening communicating with the terminal containing cavity, the insulation piece is sleeved in the opening and sealingly matched with the inner wall of the opening in the circumferential direction; the insulation piece is provided with a first through hole for the lead wire to pass through, and the insulation sealant layer is used for sealing the gap between the lead wire and the first through hole. The application can isolate the refrigerant and prevent the negative influence of the refrigerant on the motor insulation resistance. The opening is arranged at one end of the insulation main body, and the insulation sealant layer is additionally arranged at the opening to further seal the insulation main body, so that the refrigerant is prevented from entering the terminal containing cavity through the sleeve.

Description

Technical Field

[0001] This invention belongs to the field of compressor technology, specifically relating to a motor terminal insulation structure and a compressor. Background Technology

[0002] In a fully enclosed refrigeration compressor, the motor and pump body typically operate within the same housing. The compressor housing is filled with a mixture of refrigerant oil and refrigeration fluid, and the compressor motor operates in this environment. The motor is usually powered by three leads connected to three terminals, which in turn connect to terminals on the housing, supplying power to the motor. Therefore, the terminals have excellent electrical conductivity.

[0003] In the prior art, there is a Chinese invention patent with publication number CN115117680A, entitled "Wire Fixing Device, Motor and Compressor". The wire fixing device includes a main body, which includes a first wire fixing cavity, a second wire fixing cavity, a first groove and a sealing element. The main body is connected to a first opening of the first wire fixing cavity and a second opening of the second wire fixing cavity. The first groove is disposed between the first wire fixing cavity and the second wire fixing cavity. The first groove includes a wire passage hole. The wires of the first wire fixing cavity and the second wire fixing cavity are connected through the wire passage hole. The first groove abuts against the outer periphery of the wire through the wire passage hole. The wire passes through the first opening, the second opening and the wire passage hole and is limited and fixed to the main body. Because there is no allowance for sleeve installation between the main body and the second wiring cavity, the sleeve extends into the second wiring cavity. Under extreme operating conditions, liquid refrigerant seeps into the end of the sleeve closest to the motor. This liquid refrigerant then enters the second wiring cavity along the inside of the sleeve, immersing the motor terminals in it. The seals within the second wiring cavity cannot effectively seal the infiltrated liquid refrigerant. The liquid refrigerant between the terminals reduces the motor's insulation resistance, potentially leading to a short circuit. Furthermore, it cannot axially limit the terminals, has openings in the side walls, making terminal assembly inconvenient and requiring additional seals, thus posing a significant leakage risk. Therefore, an insulating structure needs to be designed between the motor terminals to protect them from refrigerant immersion without affecting their conductivity. Summary of the Invention

[0004] Therefore, the present invention provides a motor terminal insulation structure and a compressor, which can solve the problem in the prior art that the motor insulation resistance decreases due to the immersion of the motor terminals in liquid refrigerant.

[0005] To solve the above problems, the present invention provides a motor terminal insulation structure, including an insulation body, terminals and lead wires. The insulation body has a terminal receiving cavity, the terminals are disposed in the terminal receiving cavity and electrically connected to the lead wires. The motor terminal insulation structure also includes an insulating component and an insulating sealant layer.

[0006] The insulating body has an opening at one end that connects to the terminal receiving cavity. The insulating component is fitted inside the opening and is sealed to the inner wall of the opening in the circumferential direction. The insulating component has a first through hole for the lead wire to pass through, and the insulating sealant layer is used to seal the gap between the lead wire and the first through hole.

[0007] In some implementations, the insulating element is sealed to the inner wall of the opening circumferentially by an interference fit.

[0008] In some embodiments, a groove is provided at the opening, a terminal receiving cavity is disposed on the bottom surface of the groove, and an insulating component abuts against the bottom surface of the groove.

[0009] In some implementations, the insulating element is a flexible plastic component.

[0010] In some embodiments, an insulating cover is also included, located on the side of the insulating sealant layer opposite to the insulating element, the insulating cover being used to close the opening, and the insulating cover having a second through hole for the lead wire to pass through.

[0011] In some embodiments, the insulating cover is fitted inside the opening and is circumferentially sealed to the inner wall of the opening.

[0012] In some implementations, the insulating cover is sealed to the inner wall of the opening circumferentially by an interference fit.

[0013] In some implementations, the insulating cover is a flexible plastic part.

[0014] In some embodiments, a sleeve is also included, one end of which is connected to the motor for mounting the lead wire, and the other end of which extends into the opening.

[0015] The present invention also provides a compressor that includes the aforementioned motor terminal insulation structure.

[0016] The motor terminal insulation structure provided by this invention has the following beneficial effects:

[0017] 1. This invention can isolate the refrigerant, preventing its negative impact on the motor's insulation resistance. One end of the insulation body is opened, and an insulating sealant layer is added at the opening to further seal the insulation body, preventing refrigerant from entering the terminal receiving cavity through the sleeve.

[0018] 2. By setting an insulating component on the opening side and abutting the insulating component against the groove, the position of the terminal can be fixed, and the axial positioning of the terminal can be achieved, which facilitates the compressor assembly process. Attached Figure Description

[0019] To more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the accompanying drawings used in the description of the embodiments or the prior art will be briefly introduced below. The drawings described below are merely exemplary, and those skilled in the art can derive other embodiments based on the provided drawings without creative effort.

[0020] Figure 1 This is a schematic diagram of the assembly structure of the motor terminal insulation structure of the present invention;

[0021] Figure 2 yes Figure 1 A schematic diagram of the exploded structure;

[0022] Figure 3 This is a schematic diagram of the insulating body in the motor terminal insulation structure of the present invention;

[0023] Figure 4 This is a schematic diagram of the connection structure between the motor terminal insulation structure and the motor of the present invention;

[0024] Figure 5 This is a schematic diagram of the limiting slot of the insulating body in the motor terminal insulation structure of the present invention.

[0025] The attached figures are labeled as follows:

[0026] 1. Sleeve; 2. Insulating sealant layer; 3. Rubber plug a; 4. Rubber plug b; 5. Lead wire; 6. Terminal; 7. Insulating body; 8. Terminal post; 9. Motor; 901. Frame; 902. Stator core; 10. First sealing cavity; 11. Terminal receiving cavity; 12. Second sealing cavity; 13. Fourth through hole; 14. Third through hole; 15. Second through hole; 16. Groove; 17. Slot. Detailed Implementation

[0027] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. The following description of at least one exemplary embodiment is merely illustrative and is in no way intended to limit the present invention or its application or use. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0028] It should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the exemplary embodiments according to this application. As used herein, the singular form is intended to include the plural form as well, unless the context clearly indicates otherwise. Furthermore, it should be understood that when the terms "comprising" and / or "including" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0029] It should be understood that the term "and / or" used in this article is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, and B existing alone. Additionally, the character " / " in this article generally indicates that the preceding and following related objects have an "or" relationship.

[0030] Unless otherwise specifically stated, the relative arrangement, numerical expressions, and values ​​of the components and steps described in these embodiments do not limit the scope of the invention. It should also be understood that, for ease of description, the structures, proportions, sizes, etc., shown in the accompanying drawings are only for the purpose of illustrative purposes and to facilitate understanding and reading by those skilled in the art, and are not intended to limit the conditions under which the invention can be implemented. Any modifications to the structure, changes in proportions, or adjustments to size, without affecting the effects and objectives achieved by the invention, should still fall within the scope of the technical content disclosed in the invention. Techniques, methods, and devices known to those skilled in the art may not be discussed in detail, but where appropriate, such techniques, methods, and devices should be considered part of the specification. In all examples shown and discussed herein, any specific values ​​should be interpreted as merely exemplary and not as limitations. Therefore, other examples of exemplary embodiments may have different values. It should be noted that similar reference numerals and letters in the following figures denote similar items; therefore, once an item is defined in one figure, it does not need to be further discussed in subsequent figures.

[0031] In the description of this invention, it should be understood that the orientation or positional relationship indicated by directional terms such as "front, back, up, down, left, right", "horizontal, vertical, horizontal" and "top, bottom" is generally based on the orientation or positional relationship shown in the accompanying drawings, and is only for the convenience of describing this invention and simplifying the description. Unless otherwise stated, these directional terms do not indicate or imply that the device or element referred to must have a specific orientation or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation on the scope of protection of this invention; the directional terms "inner" and "outer" refer to the inner and outer contours relative to the outline of each component itself.

[0032] For ease of description, spatial relative terms such as "above," "on top of," "on the upper surface of," "above," etc., are used herein to describe the spatial positional relationship of a device or feature as shown in the figures to other devices or features. It should be understood that spatial relative terms are intended to encompass different orientations in use or operation beyond the orientation of the device as described in the figures. For example, if the device in the figures were inverted, a device described as "above" or "on top of" other devices or structures would subsequently be positioned as "below" or "under" other devices or structures. Thus, the exemplary term "above" can include both "above" and "below." The device may also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatial relative descriptions used herein will be interpreted accordingly.

[0033] Furthermore, it should be noted that the use of terms such as "" and "second" to define components is merely for the purpose of distinguishing the corresponding components. Unless otherwise stated, the above terms have no special meaning and therefore should not be construed as limiting the scope of protection of this invention.

[0034] See also Figure 1-5 As shown, according to an embodiment of the present invention, a motor terminal insulation structure is provided, comprising: an insulation body 7, a terminal 6 and a lead wire 5, wherein the insulation body 7 is provided with a terminal receiving cavity, the terminal 6 is disposed in the terminal receiving cavity 11 and electrically connected to the lead wire 5, wherein the motor terminal insulation structure further comprises an insulating component and an insulating sealant layer 2;

[0035] The insulating body 7 has an opening at one end that connects to the terminal receiving cavity. The insulating component is fitted inside the opening and is sealed to the inner wall of the opening in the circumferential direction. The insulating component has a first through hole for the lead wire 5 to pass through. The insulating sealant layer 2 is used to seal the gap between the lead wire 5 and the first through hole.

[0036] This application describes a motor terminal insulation structure used inside a hermetic refrigeration compressor, where the motor is in direct contact with the refrigerant and refrigeration oil. The motor typically connects to terminal 6 via lead wire 5, which is directly connected to terminal 8 on the housing. Both terminal 6 and terminal 8 have good conductivity. The motor usually has multiple terminals 6 that individually connect to multiple terminals 8, and these terminals are not electrically connected to each other. However, if liquid refrigerant or refrigeration oil is present between terminals 6 or between terminals 8, it will affect the insulation performance, potentially leading to a short circuit. Conventional motor lead wire sleeves 1 are in close contact with terminal 6 at one end, and part of the sleeve is inside the sealed structure, allowing refrigerant to flow from the other end of the sleeve to the terminal, still affecting the motor's insulation resistance. This solution rationally changes the position of the sleeve to completely seal the terminal. Typically, the enameled wire lead wire is wrapped with a plastic sleeve to prevent scratches. The sleeve 1 typically extends to terminal 6, which presents the problem that liquid refrigerant or refrigeration oil can flow along the sleeve 1 to the vicinity of terminal 6. Therefore, the insulation structure should prevent liquid refrigerant or refrigeration oil from entering the sleeve 1, or seal the other end of the sleeve 1. In the prior art, because there is no allowance for the sleeve 1 within the housing, one end of the sleeve 1 enters the seal, and the refrigeration unit seeps in from the end of the sleeve near the motor and into the seal, causing a decrease in the insulation performance between terminals or between terminals. This application provides an opening to allow for the installation of the sleeve 1, preventing the sleeve from directly seeping into the insulation and causing seal leakage. This application uses an insulating seal to enclose the motor lead 5, terminal 6, and internal terminal 8 of the housing, isolating the refrigerant and ensuring that the motor insulation resistance does not decrease due to contact between the multiple strands of wire and the refrigerant. After the motor lead 5 is connected to terminal 6, it is inserted into one end of the insulating body 7, and the internal terminal 8 of the housing is inserted into the other end of the insulating body 7. The terminal 8 and terminal 6 are connected inside the insulating body 7. Furthermore, the two ends of the plastic shell 7 are sealed by insulating components. The insulating component on the open side is fitted with the lead wire 5 with a gap, and an insulating sealant layer 2 is applied in the gap, which can serve as a potting effect. In this way, the conductive parts are all isolated in the insulating body 7. The motor terminal insulation structure of this application can completely wrap the terminal 6 and the terminal 8, isolating the conductive parts from the refrigerant and refrigeration oil, thereby achieving an insulating function. The motor lead wire 5 and the terminal 8 are placed in the insulating body 7 from both ends of the insulating body 7 and are connected therein. The insulating body 7 can be made of insulating materials such as plastic, and the two ends of the insulating body 7 are sealed by insulating components. The insulating components of this application include a first sealing component and a second sealing component. Both the first sealing component and the second sealing component can be rubber plugs, resin, or other insulating materials. The first sealing component is a rubber plug a3, which is set in the first sealing cavity 10 to seal the terminal 8 and the insulating body 7.The second sealing element is a rubber plug b4, which is disposed at the opening, forming a second sealing cavity 12. The rubber plug b4 is placed within the second sealing cavity 12 to seal the lead wire 5 and the insulating body 7. The lead wire 5 is typically connected to the terminal 6 by riveting or welding. The terminal 8 is connected to the terminal 6 by insertion. All three are electrically connected and are placed within the terminal receiving cavity 11 of the insulating body 7. The terminal 6, as well as the parts connected to the lead wire 5 and the terminal 8, are all placed within the terminal receiving cavity 11. This application uses the abutment between the second sealing element and the insulating body 7 to fix the position of the terminal 6, achieving axial positioning of the terminal 6 and facilitating the compressor assembly process. Alternatively, the invention can also provide a sealing cavity 10 on the side of the insulating body 7 opposite to the opening. An insulating element is provided within the sealing cavity 10, and the insulating element is interference-fitted with the terminal 8 to seal the refrigerant on one side of the terminal 8. The insulating element has corresponding through holes for the terminal 8 to pass through. The first sealing element is provided with a fourth through hole 13, the second sealing element is provided with a third through hole 14, the insulating sealant layer forms the first through hole, and the insulating cover is provided with a second through hole 15. The fourth through hole 13, the third through hole 14, the first through hole and the second through hole 15 are coaxial.

[0037] In some embodiments, the insulating element is sealed to the inner wall of the opening circumferentially by an interference fit. In this application, by interfering the insulating element with the inner wall of the insulating body 7 located at the opening, its sealing performance can be improved.

[0038] In some embodiments, a groove 16 is provided at the opening, and a terminal receiving cavity 11 is disposed on the bottom surface of the groove 16, with the insulating member abutting against the bottom surface of the groove 16. In this application, a groove 16 is provided at the opening. The groove 16 can be provided separately or integrally formed with the insulating body 7. The terminal receiving cavity 11 is disposed on the bottom surface of the groove 16, which can limit the circumferential movement of the terminal 6. The insulating member abutting against the bottom surface of the groove 16 can limit the axial movement of the terminal 6. To separate the three terminals 6, this application provides two grooves 16, forming three terminal receiving cavities 11 between the groove 16 and the insulating body 7 for accommodating the terminals 6. Other forms are also possible, such as arranging the three terminals 6 side by side or in a triangular arrangement. In existing technologies, under harsh conditions, the insulation performance deteriorates when immersed in refrigerant. The seals fail to seal the wall and wires, and the bottom has a wire-passing hole, allowing only the terminal 6 to be inserted through a side wall opening. This side wall opening is not sealed, allowing refrigerant to enter the wall and further degrading the insulation performance of the terminal 6. This application addresses these problems by opening both ends of the insulating body 7 to facilitate the insertion of the seals. The seals in the second sealing cavity 12 directly abut against the terminal receiving cavity 11. The pressure of the refrigerant on the side of the seals away from the terminal receiving cavity 11 provides a better seal between the insulating body 7 and the lead wire 5, eliminating the need for openings in the side walls of the insulating body 7 and preventing unnecessary leaks. In this application, the insulating body 7 and the insulating elements are not limited to the above descriptions; any insulating material with good sealing performance is acceptable. The motor insulation structure of this application ensures sufficient distance or sufficiently voltage-resistant insulating material between terminals 6 and between terminals 8 to prevent short circuits.

[0039] In some embodiments, the insulating element is a flexible plastic component. In this application, the insulating element prevents refrigerant from entering the terminal receiving cavity 11. The insulating element includes a rubber plug b4, which is clearance-fitted with the lead wire 5 to facilitate the passage of the lead wire 5.

[0040] In some embodiments, an insulating cover is also included. The insulating cover is located on the side of the insulating sealant layer 2 opposite to the insulating element. The insulating cover is used to close the opening and has a second through hole for the lead wire to pass through. In this application, by providing an insulating cover to close the opening, and when the insulating sealant layer 2 is resin adhesive, it is possible to prevent resin adhesive from aging and flaked into the housing and pump body. The insulating cover in this application can also be a rubber stopper.

[0041] In some embodiments, the insulating cover is fitted inside the opening and is circumferentially sealed to the inner wall of the opening.

[0042] In some implementations, the insulating cover is sealed to the inner wall of the opening circumferentially by an interference fit.

[0043] In some embodiments, the insulating cover is a flexible plastic part. The flexible plastic part in this application can be an insulating adhesive, a rubber stopper, or a sealing ring, etc.

[0044] In some embodiments, a sleeve 1 is also included, one end of which is connected to the motor for mounting the lead wire, and the other end of the sleeve extends into the opening. This application simplifies the length of the lead wire 5 and sleeve 1, controlling the lead wire 5 outside the sealing structure. Alternatively, the length can be left uncontrolled by sealing the other end of the sleeve 1, as long as the condition of internal and external isolation is met.

[0045] The insulating body 7 of this application is also provided with a slot 17 for connecting the motor 9. The motor stator is composed of an iron core 902 and an insulating frame 901, etc. The outer hub of the iron core is nearly circular and larger than the outer diameter of the frame, and it is slotted along the axial direction, generally used as an oil return channel. After the motor lead wire 5 and terminal 6 are placed into the insulating body 7 and sealed, the insulating body 7 is folded over, and the slot 17 on the back of the insulating body 7 can then cooperate with the oil return groove and the cut edge of the iron core to complete the axial limit. During assembly, the connecting end of the terminal 8 of the insulating body 7 should face the end cover. After installing the rubber plug on the terminal 8 on the end cover, the cover can be closed. During production assembly, the terminal 6 needs to be connected to the terminal 7 on the end cover before the cover can be closed and welded. In order to facilitate the operation of the next process, the lead wire is relatively long. After assembly, the lead wire 5 is coiled near the rotor and stator of the compressor motor, which is not compact enough and increases the risk of drawing lines on the lead wire 5. This solution fixes the terminal position axially by designing a slot, and the cover can be closed directly along the axial direction during production to complete the cooperation between the terminal 6 and the terminal 7. After the motor lead wire is connected to terminal 6, it is inserted into one end of the insulating body 7 and sealed. Then, the junction box is folded over and attached to the motor 9. The motor core 902 has grooves and cut edges, which can be matched with the slots 17 of the insulating body 7 to achieve limiting.

[0046] This application also provides a compressor, including the aforementioned motor terminal insulation structure.

[0047] It will be readily understood by those skilled in the art that, without conflict, the advantageous technical features of the above-mentioned methods can be freely combined and superimposed.

[0048] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included within the protection scope of the present invention. The above description is only a preferred embodiment of the present invention. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the technical principles of the present invention, and these improvements and modifications should also be considered within the protection scope of the present invention.

Claims

1. A motor terminal insulation structure, comprising an insulation body (7), a terminal (6), and a lead wire (5), wherein the insulation body (7) has a terminal receiving cavity, and the terminal (6) is disposed within the terminal receiving cavity and electrically connected to the lead wire (5), characterized in that, The motor terminal insulation structure also includes an insulating component and an insulating sealant layer (2). Wherein, one end of the insulating body (7) is provided with an opening that connects to the terminal receiving cavity, the insulating component is sleeved in the opening and is sealed to the inner wall of the opening in the circumferential direction; the insulating component is provided with a first through hole for the lead wire (5) to pass through, and the insulating sealant layer (2) is used to seal the gap between the lead wire (5) and the first through hole; The opening is provided with a groove (16), the terminal receiving cavity (11) is provided on the bottom surface of the groove (16), and the insulating member abuts against the bottom surface of the groove (16); the motor terminal insulation structure also includes an insulating cover, the insulating cover is located on the side of the insulating sealant layer (2) away from the insulating member, the insulating cover is used to cover the opening, and the insulating cover is provided with a second through hole (15) for the lead wire (5) to pass through.

2. The motor terminal insulation structure according to claim 1, characterized in that, The insulating component is sealed to the inner wall of the opening circumferentially by an interference fit.

3. The motor terminal insulation structure according to claim 1 or 2, characterized in that, The insulating component is a flexible plastic component.

4. The motor terminal insulation structure according to claim 1, characterized in that, The insulating cover is fitted inside the opening and is sealed to the inner wall of the opening circumferentially.

5. The motor terminal insulation structure according to claim 4, characterized in that, The insulating cover is sealed to the inner wall of the opening circumferentially by an interference fit.

6. The motor terminal insulation structure according to claim 1, characterized in that, The insulating cover is a flexible plastic part.

7. The motor terminal insulation structure according to any one of claims 4-6, characterized in that, It also includes a sleeve (1), one end of which is connected to a motor for mounting lead wires (5), and the other end of which extends into the opening.

8. A compressor, characterized in that, The motor terminal insulation structure includes any one of claims 1-7.

Images