Enclosed refrigerant cooling high-voltage motor wiring terminal

Abstract

The utility model discloses a closed refrigerant cooling high-voltage motor wiring terminal, and belongs to the technical field of motors. Comprising at least one annular groove which is arranged on the outer wall of the wiring terminal and is continuously distributed along the axis direction of the wiring terminal, a positioning piece which extends outwards is arranged on the outer wall of the wiring terminal, and a connecting hole is formed in the positioning piece. According to the technical scheme, the specific structure of the wiring terminal is improved, the connection mode of the high-voltage motor and the wiring terminal is improved, and the high-voltage motor is protected.

Description

Technical Field

[0001] This application relates to the field of motor technology, and in particular to a closed-loop refrigerant-cooled high-voltage motor terminal block. Background Technology

[0002] Motor terminals are connecting components used to connect the internal cables and external power lines of a high-voltage motor. Since the internal cables and external power lines are located inside and outside the motor housing respectively, one end of the motor terminal needs to pass through the motor housing to connect the internal cables and power lines.

[0003] Hermetic refrigerant-cooled motors utilize the latent heat of phase change of liquid refrigerant for cooling. Normally, the surface temperature of the motor casing and terminals is lower than the ambient temperature. However, when the motor operates in high-humidity environments, condensation can form on the surface of the terminals due to the low temperature. This makes the surface of the insulating terminals prone to polarization, shortening the actual creepage distance of the 160mm long terminals (compliant with design specifications). This can lead to surface discharge or arcing, damaging the high-voltage motor. Furthermore, existing terminals are directly plugged into the high-voltage motor casing, but the connection between the terminals and the motor is not tight. The terminals can rotate relative to the motor, easily causing internal cable twisting and resulting in motor malfunction.

[0004] This application proposes a technical solution to address the damage and malfunctions of high-voltage motors caused by existing terminal block structures and connection methods. Utility Model Content

[0005] The purpose of this application is to provide a closed-loop refrigerant-cooled high-voltage motor terminal block, which improves the specific structure of the terminal block, improves the connection method between the high-voltage motor and the terminal block, and protects the high-voltage motor.

[0006] The closed-loop refrigerant-cooled high-voltage motor wiring terminal provided in this application adopts the following technical solution: it includes at least one annular groove disposed on the outer wall of the wiring terminal and continuously distributed along the axial direction of the wiring terminal, and the outer wall of the wiring terminal has an outwardly extending positioning member, and the positioning member is provided with a connection hole.

[0007] By adopting the above technical solution, to prevent water accumulation on the surface of the terminals in humid working environments from reducing the actual creepage distance, multiple annular grooves are provided on the outer surface of the terminals. If water droplets form on the terminals, the annular grooves can guide the water droplets away, preventing water accumulation on the terminals and thus avoiding surface discharge or arc discharge that could damage the high-voltage motor. In sunny weather, the annular grooves can shorten the terminal length as much as possible without changing the creepage distance. For example, for a terminal with a standard design length of 160mm, adding multiple annular grooves to its outer wall can make the actual length of the terminal less than 160mm while still meeting the creepage distance requirements, thus reducing the weight of the terminal.

[0008] On the other hand, in order to prevent the terminal block from rotating relative to the high-voltage motor, which could cause the internal cable of the motor to twist and cause the high-voltage motor to malfunction, an outwardly extending positioning part is set on the outer wall of the terminal block. The positioning part has a connection hole, which is used to fix it to the high-voltage motor. This ensures that the terminal block no longer rotates freely relative to the high-voltage motor after wiring is completed, thus avoiding the high-voltage motor from malfunctioning.

[0009] Optionally, the annular grooves are arranged at equal intervals, and the outer radial direction of multiple annular grooves gradually narrows away from the end of the high-voltage motor.

[0010] By adopting the above technical solution, the annular grooves are set at equal intervals. In the axial direction of the terminal block, the cross-section of the continuous annular grooves is a symmetrical continuous wavy line, which increases the creepage distance and helps to drain the water droplets that accumulate on the surface of the terminal block, thus avoiding water accumulation. In addition, when the two wavy lines move closer to each other towards the end away from the high-voltage motor, the drainage effect on the surface of the terminal block is better, and the creepage distance is further increased, thus protecting the high-voltage motor in general.

[0011] Optionally, the single annular groove structure is arc-shaped or T-shaped.

[0012] By adopting the above technical solution, setting the cross-sectional structure of the annular groove to be arc-shaped or T-shaped can both prevent water accumulation and increase the creepage distance.

[0013] Optionally, the positioning element is a disc-shaped structure or a fan-shaped structure.

[0014] By adopting the above technical solution, a centrally symmetrical disc-shaped or fan-shaped structure is fixed on the outer wall of the terminal block as a positioning component, which, together with the connection hole, achieves a fixed connection between the terminal block and the high-voltage motor during the wiring process.

[0015] Optionally, the number of connection holes is multiple and they are evenly distributed around the axis of the terminal block.

[0016] By adopting the above technical solution, multiple connection holes are evenly arranged on the disc-shaped or fan-shaped positioning component, and the wiring terminals are fixed to the high-voltage motor through the connection holes.

[0017] Optionally, a connecting post is provided on the surface of the high-voltage motor, and the connecting hole is fixedly connected to the connecting post with a nut.

[0018] By adopting the above technical solution, after the internal cables and power lines of the motor are connected, the terminal block is rotated so that the connecting hole on the positioning part is aligned with the connecting post and then inserted into each other. The end of the connecting post is threaded, and the terminal block is fixed to the high-voltage motor with the help of a nut.

[0019] Optionally, the terminal block has an axial through hole for the cable to pass through, the through hole having three sections, with the second through hole in the middle section having the smallest diameter.

[0020] By adopting the above technical solution, the first section of the second through hole on the side closer to the high-voltage motor is the first through hole, and the third section of the second through hole on the side farther away from the high-voltage motor is the third through hole. The large diameter of the first and third through holes facilitates the passage of internal cables and external power lines and the connection, while the small diameter of the second through hole helps to prevent the cable from twisting inside the terminal block.

[0021] Optionally, the through hole near the high-voltage motor is a first through hole, and the hole of the first through hole gradually tapers in the direction of the second through hole.

[0022] By adopting the above technical solution, the gradually decreasing diameter of the first through hole helps the cable to be inserted into the first through hole and also helps to further prevent the cable from twisting inside the terminal block.

[0023] Optionally, a radially protruding step is provided at one end of the first through hole near the second through hole.

[0024] By adopting the above technical solution, the contact end face of the step with the cable is flat, which, together with the inner wall of the first through hole, can give the cable passing through the first through hole a squeezing force, which helps to further prevent the cable from twisting.

[0025] Optionally, the positioning element has a circular groove on its end face near the high-voltage motor, and an O-ring is installed in the circular groove.

[0026] By adopting the above technical solution, the circular groove is combined with the O-ring to achieve a seal between the high-voltage motor and the terminal block, preventing refrigerant leakage inside the motor.

[0027] In summary, this application includes at least one of the following beneficial technical effects:

[0028] 1. In rainy weather, by setting continuously distributed annular grooves on the outer surface of the terminal block, water droplets are guided to flow, water accumulation is avoided, the probability of surface discharge or arc discharge is reduced, and the high-voltage motor is protected.

[0029] 2. In clear weather, by setting continuously distributed annular grooves on the outer surface of the terminal block, the length of the terminal block can be shortened as much as possible without changing the creepage distance, thus reducing the weight of the terminal block.

[0030] 3. A positioning element is installed on the outer wall of the terminal block, and evenly distributed connection holes are made on the positioning element. The terminal block is fixedly connected to the connecting post on the high-voltage motor through the connection holes, so that the terminal block will no longer rotate freely relative to the high-voltage motor after wiring, preventing the internal cable of the motor from twisting relative to the high-voltage motor and avoiding high-voltage motor failure. Attached Figure Description

[0031] Figure 1 This is a schematic diagram of the overall structure of a closed-loop refrigerant-cooled high-voltage motor terminal block;

[0032] Figure 2 This is a right view of the wiring terminals of a closed-loop refrigerant-cooled high-voltage motor.

[0033] Figure 3 This is a sectional view (AA) of a closed-loop refrigerant-cooled high-voltage motor terminal block.

[0034] Figure 4 yes Figure 3 A magnified view of part a.

[0035] Explanation of reference numerals in the attached drawings: 1. Terminal block; 2. High-voltage motor; 21. Connecting post; 23. O-ring seal; 3. Mounting hole; 5. Positioning element; 51. Connecting hole; 52. Circular groove; 6. Through hole; 61. First through hole; 611. Step; 62. Second through hole; 63. Third through hole; 7. Cable; 8. Annular groove. Detailed Implementation

[0036] The following is in conjunction with the appendix Figure 1 -Appendix Figure 4 This application will be described in further detail.

[0037] This application discloses a closed-loop refrigerant-cooled high-voltage motor terminal block.

[0038] Combination Figure 1As shown, a closed-loop refrigerant-cooled high-voltage motor terminal block includes a high-voltage motor 2. One end of the terminal block 1 is inserted into a pre-drilled mounting hole 3 on the high-voltage motor 2 and connected to an internal cable 7. The other end is connected to an external power supply line, thus connecting the internal cable 7 and the external power supply line. The terminal block also includes at least one annular groove 8 continuously distributed along the axial direction of the terminal block 1 on its outer wall. The outer wall of the terminal block 1 has an outwardly extending positioning element 5, such as... Figure 2 As shown, the positioning element 5 has connecting holes 51. The positioning element 5 has a disc-shaped structure or a fan-shaped structure; the one shown in the figure is a disc-shaped structure. Multiple connecting holes 51 are distributed on the positioning element 5, such as... Figure 2 , Figure 3 As shown, specifically, multiple connecting holes 51 are evenly distributed around the axis of the terminal 1 on the end face of the disc-shaped positioning member 5.

[0039] Multiple annular grooves 8 are provided on the outer surface of the terminal block 1 to prevent the actual creepage distance of the terminal block 1 from decreasing in a humid working environment. That is, the closed refrigerant cooling motor uses the latent heat of phase change of liquid refrigerant to cool the high-voltage motor 2, so that the surface temperature of the high-voltage motor 2 casing and the terminal block 1 is lower than the external ambient temperature. When the high-voltage motor 2 is working in a high humidity environment, when water droplets form on the surface of the terminal block 1 due to low temperature, the annular grooves 8 on the terminal block 1 can guide the water droplets to flow away, preventing water droplets from accumulating on the terminal block 1 and causing surface discharge or arc discharge that could damage the high-voltage motor 2.

[0040] When working in sunny weather, the design of the annular groove 8 can shorten the length of the terminal 1 as much as possible without changing the creepage distance. For example, for a terminal 1 with an existing design specification of 160mm in length, multiple annular grooves 8 can be set on its outer wall so that the actual length of the terminal 1 is less than 160mm to meet the creepage distance requirement.

[0041] After the internal cable 7 of the motor is connected to the power line, the cable 7 generally cannot be twisted relative to the terminal 1. In order to prevent the cable 7 from twisting relative to the high-voltage motor 2 and causing the high-voltage motor 2 to malfunction, the terminal 1 and the high-voltage motor 2 need to be fixed. An outwardly extending positioning part 5 is provided on the outer wall of the terminal 1. The positioning part 5 has a connection hole 51. It is fixedly connected to the connecting post 21 on the high-voltage motor 2 through the connection hole 51 to protect the high-voltage motor 2.

[0042] Combination Figure 2 , Figure 3 As shown, in one embodiment of this application, the connecting holes 51 evenly distributed on the positioning member 5 are interlocked with the connecting posts 21 that are fitted onto the surface of the high-voltage motor 2, as shown. Figure 4As shown, the end of the connecting post 21 is threaded, and the nut is used to fix the terminal 1 and the high-voltage motor 2 together, thus avoiding relative rotation between the terminal 1 and the high-voltage motor 2 at the contact end face.

[0043] Combination Figure 3 As shown, a centrally symmetrical through hole 6 is provided in the internal axial direction of the terminal 1, and the through hole 6 is divided into three sections in the direction away from the high voltage motor 2, namely the first through hole 61, the second through hole 62 and the third through hole 63; among them, the second through hole 62 has the smallest diameter. The first through hole 61 and the third through hole 63 are selected with large diameters to help the internal cable 7, the external power line and the connection point of the two pass through the through hole 6. The small diameter of the second through hole 62 helps to further prevent the internal cable 7 from twisting at the terminal 1.

[0044] To further facilitate the passage of the internal cable 7 through the first through hole 61, such as Figure 3 As shown, the first through hole 61 tapers radially towards the second through hole 62. The taper angle can be selected from 1° to 3°, and is 2° as shown in the figure.

[0045] like Figure 2 , Figure 3 As shown, a step 611 is provided at the first through hole 61 near the second through hole 62. In the embodiment of this application, the step 611 is a pair of steps 611 that protrude radially toward the first through hole 61. The opposite surfaces of this pair of steps 611 are two parallel planes and the distance between them is smaller than the inner diameter of the first through hole 61. When the internal cable 7 passes through this pair of steps 611, it will be subjected to a compressive force, which helps to further prevent the cable 7 from twisting.

[0046] like Figure 3 As shown, to make it easier and more convenient to insert the terminal 1 into the mounting hole 3 of the high-voltage motor 2, the outer radial direction of the insertion end of the terminal 1 tapers towards the mounting direction. The taper angle can be selected from 1° to 5°, and 3° is shown in the figure.

[0047] To further improve the performance of the annular groove 8 in guiding water droplets during rainy weather, increase the creepage distance of the terminal block 1, and enhance the safety of the high-voltage motor 2 in both humid and dry conditions, the outer radial end of the annular groove 8 is tapered away from the positioning element 5. The tapering angle can be selected from 2° to 8°, with 5° shown in the figure. Figure 3As shown, the continuously arranged annular grooves 8 form a continuous wavy line in the axial direction. After adopting a 5° tapering angle, the drainage effect of a pair of continuous annular grooves 8 that move closer to each other towards the end away from the positioning member 5 is better than when they are arranged in parallel. That is, the normal direction of the lowest point of the annular grooves 8 is no longer perpendicular to the axis of the terminal 1. Raindrops are less likely to accumulate on the surface of the terminal 1, reducing the formation of water accumulation and lowering the risk of surface discharge and arc discharge. At the same time, after the continuous annular grooves 8 adopt a 5° tapering angle, the creepage distance of the terminal 1 is further increased. Under the same creepage distance, the length of the terminal 1 is further compressed, the weight of the terminal 1 is reduced, and the high-voltage motor 2 is protected overall.

[0048] like Figure 4 As shown, the cross-sectional shape of the annular groove 8 is arc-shaped. Of course, other cross-sectional shapes such as T-shaped can also be used to facilitate drainage of the outer wall of the terminal 1.

[0049] In another embodiment of this application, a circular groove 52 is provided on the end face of the positioning member 5 near the high-voltage motor 2. An O-ring 23 is installed in the circular groove 52 to achieve sealing when the high-voltage motor 2 is tightly connected to the terminal block 1, and to prevent refrigerant leakage inside the motor.

[0050] The above are all preferred embodiments of this application, and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. A closed-loop refrigerant-cooled high-voltage motor terminal block, characterized in that: It includes at least one annular groove (8) disposed on the outer wall of the terminal (1) and continuously distributed along the axial direction of the terminal (1), wherein the outer wall of the terminal (1) has an outwardly extending positioning member (5), and the positioning member (5) has a connecting hole (51).

2. The closed-loop refrigerant-cooled high-voltage motor terminal block according to claim 1, characterized in that: The annular grooves (8) are arranged at equal intervals, and the outer radial direction of the multiple annular grooves (8) gradually narrows away from the end of the high-voltage motor (2).

3. The closed-loop refrigerant-cooled high-voltage motor terminal block according to claim 2, characterized in that: The structure of a single annular groove (8) is arc-shaped or T-shaped.

4. The closed-loop refrigerant-cooled high-voltage motor terminal block according to claim 1, characterized in that: The positioning element (5) is a disc-shaped structure or a fan-shaped structure.

5. A closed-loop refrigerant-cooled high-voltage motor terminal block according to claim 4, characterized in that: The number of connection holes (51) is multiple and they are evenly distributed around the axis of the terminal block.

6. A closed-loop refrigerant-cooled high-voltage motor terminal block according to claim 5, characterized in that: The surface of the high-voltage motor (2) is provided with a connecting post (21), and the connecting hole (51) is fixedly connected to the connecting post (21) with a nut.

7. A closed-loop refrigerant-cooled high-voltage motor terminal block according to claim 1, characterized in that: The terminal block (1) has an axial through hole (6) for the cable (7) to pass through. The through hole (6) has three sections, and the second through hole (62) in the middle section has the smallest diameter.

8. A closed-loop refrigerant-cooled high-voltage motor terminal block according to claim 7, characterized in that: The through hole (6) near the high-voltage motor (2) is the first through hole (61), and the hole of the first through hole (61) gradually tapers in the direction of the second through hole (62).

9. A hermetically sealed refrigerant-cooled high voltage electrical machine terminal according to claim 8, characterised in that: A radially protruding step (611) is provided at one end of the first through hole (61) near the second through hole (62).

10. A closed-loop refrigerant-cooled high-voltage motor terminal block according to claim 1, characterized in that: The positioning component (5) has a circular groove (52) on its end face near the high-voltage motor (2), and an O-ring (23) is installed in the circular groove (52).

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