Corrosion-resistant structure of water-cooling electric drive system

Abstract

The invention relates to the technical field of water-cooling electric drive system rust prevention, in particular to a water-cooling electric drive system corrosion-resistant structure which is characterized in that a containing space is formed in a motor cavity; a temperature control switch is arranged between the motor cavity and the accommodating space; the accommodating space is filled with anti-rust oil; after the temperature of the motor cavity rises, the temperature control switch is turned on to inject anti-rust oil into the motor cavity, heat can be generated when a motor rotor of the water-cooling electric drive system works, after the heat rises to a certain degree, the temperature control switch is turned on, the anti-rust oil is injected into the motor cavity, and the anti-rust oil is atomized in a high-temperature environment, so that the anti-rust oil is atomized. And the anti-rust oil is uniformly distributed on the surfaces of the electric appliance parts, so that the effects of isolating air and water vapor and further delaying corrosion of easily-corroded parts such as a motor and a rotary transformer are achieved.

Description

Technical Field

[0001] The present invention relates to the technical field of anti-rust for water-cooled electric drive systems, and in particular to a corrosion-resistant structure for a water-cooled electric drive system. Background Art

[0002] Referring to Figure 1 and Figure 2 a water-cooled electric drive system includes a motor assembly, a motor controller assembly, a resolver assembly, a high-voltage connector, a motor water-cooling system, and a reducer; the reducer cavity is an environment containing lubricating oil, and the motor, resolver, and electronic control cavity are environments without lubricating oil. The motor dissipates heat mainly through the heat exchange between the housing of the motor mounting cavity and the external coolant; when the electric drive system is operating, the motor is the main heat source. When the motor is overheated, the lower coolant exchanges heat through the housing, and the housing quickly cools down. The humid air inside the housing will condense on the inner wall of the housing in a closed environment; or for some motors operating in areas with high humidity, the humidity of the air inside the motor is relatively high after the air inside the motor is exchanged with the ambient air, and condensation is likely to occur when the motor is in a stopped state. Therefore, condensation often occurs in the water-cooled electric drive system.

[0003] At present, more water-cooled electric drive systems on the market adopt sealing designs such as oil seals, O-rings, and sealants to ensure the tightness during the use of the transmission as much as possible and prevent foreign substances such as water vapor, oil, and dust from entering the motor and electronic control cavity; the motor and electronic control cavity of the water-cooled electric drive system includes electrical components such as motors, electronic controls, and resolvers; due to the electrical connection characteristics of the circuit loop, there are structures with bare copper, silicon steel sheets, and exposed welding ends at the electrical component terminals. When the condensation accumulates severely and due to the aging or failure of the seals, water vapor may enter the motor and electronic control cavity, resulting in corrosion of the bare copper and silicon steel sheet structures, and further causing early failure faults such as electrochemical corrosion leading to copper wire breakage and electrical circuit open circuit.

[0004] Therefore, the present invention proposes a corrosion-resistant structure for a water-cooled electric drive system. Summary of the Invention

[0005] Therefore, the technical problem to be solved by the present invention is: to prevent condensation from occurring in the electronic control cavity and causing corrosion and rusting.

[0006] The above technical problem is solved by the following technical solutions: The present invention proposes a corrosion-resistant structure for a water-cooled electric drive system, including,[[]]

[0007] a first accommodating member;

[0008] a second accommodating member, which contains a fluid inside;

[0009] a separator, which can isolate the internal spaces of the first accommodating member and the second accommodating member;

[0010] When the temperature inside the first accommodating member rises, the isolating member can release the isolation of the internal spaces of the first accommodating member and the second accommodating member.

[0011] In a preferred embodiment of the corrosion-resistant structure of the water-cooled electric drive system according to the present invention: it further includes a rotating body, and the rotating body is arranged inside the first accommodating member;

[0012] When the isolating member releases the isolation of the internal spaces of the first accommodating member and the second accommodating member, the fluid inside the second accommodating member can reach the rotating surface of the rotating body.

[0013] In a preferred embodiment of the corrosion-resistant structure of the water-cooled electric drive system according to the present invention: the rotating body is a motor rotor.

[0014] In a preferred embodiment of the corrosion-resistant structure of the water-cooled electric drive system according to the present invention: the fluid is rust preventive oil.

[0015] In a preferred embodiment of the corrosion-resistant structure of the water-cooled electric drive system according to the present invention: the isolating member includes,

[0016] a first contact end and a second contact end;

[0017] When the first contact end and the second contact end are in contact, the internal spaces of the first accommodating member and the second accommodating member are isolated;

[0018] When the first contact end and the second contact end are not in contact, the isolation of the internal spaces of the first accommodating member and the second accommodating member is released;

[0019] It further includes a deformation element, the deformation element is used to control the distance between the first contact end and the second contact end, and after the temperature rises, the distance between the first contact end and the second contact end increases.

[0020] In a preferred embodiment of the corrosion-resistant structure of the water-cooled electric drive system according to the present invention: the first contact end is provided with a lower support end and an upper support end;

[0021] The deformation element includes a push rod arranged on the upper support end, and a storage sleeve slidably arranged outside the push rod, paraffin wax is arranged inside the storage sleeve, and a support spring is also arranged between the lower support end and the second contact end.

[0022] In a preferred embodiment of the corrosion-resistant structure of the water-cooled electric drive system according to the present invention: the first contact end is provided with a lower support end;

[0023] The deformation element is a shape memory alloy bracket;

[0024] The shape memory alloy bracket is arranged between the lower support end and the second contact end.

[0025] In a preferred embodiment of the corrosion-resistant structure of the water-cooled electric drive system according to the present invention: an upper support end is provided on the first contact end;

[0026] The deformation element is a thermal expansion alloy column;

[0027] Both ends of the thermal expansion alloy column are respectively connected to the upper support end and the second contact end.

[0028] The beneficial effect of the present invention is that by injecting fluid into the interior of the first accommodating member through the isolating member, and covering the inner wall of the first accommodating member with the fluid, the electronic devices and metals placed in the first accommodating member can be protected, and their corrosion resistance effect can be improved.

[0029] The present invention also provides a corrosion-resistant structure for a water-cooled electric drive system, including

[0030] An accommodating space is arranged on the motor cavity;

[0031] A temperature control switch is arranged between the motor cavity and the accommodating space;

[0032] Antirust oil is filled in the accommodating space;

[0033] After the temperature of the motor cavity rises, the temperature control switch is turned on to inject antirust oil into the motor cavity.

[0034] In a preferred embodiment of the corrosion-resistant structure of the water-cooled electric drive system according to the present invention: the temperature control switch is a thermostat.

[0035] The beneficial effect of the present invention is that when the motor rotor of the water-cooled electric drive system is working, heat will be generated. When the heat rises to a certain level, the temperature control switch is turned on, and the antirust oil is injected into the motor cavity. The motor cavity and the electric control cavity are in a connected state. The antirust oil falling on the motor rotor will be scattered. Under the condition of a high-temperature environment, the antirust oil will be atomized. The atomized antirust oil can be evenly distributed into the electric control cavity and the motor cavity with the rotation of the motor rotor, and the oil mist can enter each gap with the rotation of the motor rotor. Therefore, finally, a uniform oil film can be formed. After the subsequent equipment stops, the oil film can protect the internal electronic devices and the metal surface. Utilizing the characteristic that a small amount of antirust oil is easy to form a mist under the conditions of high temperature and high-speed rotation, the antirust oil is evenly distributed on the surface of the electrical components, playing a role in isolating air and water vapor, and thus delaying the corrosion of easily corroded parts such as motors and resolvers. Description of the Drawings

[0036] To more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings of the embodiments of the present invention will be briefly introduced below. Obviously, the accompanying drawings in the following description only relate to some embodiments of the present invention and do not limit the present invention.

[0037] Figure 1 Shows a schematic diagram of the overall structure of the water-cooled electric drive system.

[0038] Figure 2 Shows a schematic diagram of the internal structure of the water-cooled electric drive system.

[0039] Figure 3 Shows a schematic diagram of the connection structure of the motor cavity, accommodation space, and temperature control switch.

[0040] Figure 4 Shows a schematic diagram of the connection structure of the first accommodation member, second accommodation member, fluid, isolation member, and rotating body.

[0041] Figure 5 Shows a schematic diagram of the connection structure of the first contact end, second contact end, lower support end, upper support end, storage sleeve, and support spring.

[0042] Figure 6 Shows a sectional view of the first contact end, second contact end, lower support end, upper support end, storage sleeve, and support spring.

[0043] Figure 7 Shows a schematic diagram of the connection structure of the first contact end, shape memory alloy bracket, and lower support end.

[0044] Figure 8 Shows a sectional view of the first contact end, shape memory alloy bracket, and lower support end.

[0045] Figure 9 Shows a schematic diagram of the connection structure of the first contact end, second contact end, thermal expansion alloy column, and upper support end.

[0046] Figure 10 Shows a sectional view of the first contact end, second contact end, thermal expansion alloy column, and upper support end.

[0047] In the figure:

[0048] 1. First accommodation member; 2. Second accommodation member; 3. Fluid; 4. Isolation member; 5. Rotating body;

[0049] 41. First contact end; 42. Second contact end; 43. Deformation element;

[0050] 100. Motor cavity; 200. Accommodation space; 300. Temperature control switch; 400. Antirust oil;

[0051] 411. Lower support end; 412. Upper support end;

[0052] 431. Thumb lever; 432. Storage sleeve; 433. Paraffin wax; 434. Support spring; 435. Shape memory alloy bracket; 436. Thermal expansion alloy column. Detailed implementation manner

[0053] In order to enable those skilled in the art to better understand the present invention, the present invention will be further described in detail below in conjunction with the specific implementation manners and the accompanying drawings.

[0054] The terms used in the present invention are those general terms that are currently widely used in the art in consideration of the functions of the present invention. However, these terms may change according to the intentions of those of ordinary skill in the art, precedents, or new technologies in the art. In addition, specific terms may be selected by the applicant, and in this case, their detailed meanings will be described in the detailed description of the present invention. Therefore, the terms used in the specification should not be understood as simple names, but based on the meanings of the terms and the overall description of the present invention.

[0055] Refer to Figure 1 , which is a composition framework diagram of an existing water flow electric drive system, usually composed of a speed reducer, a motor, and an electric control part. Refer to Figure 2 , the speed reducer cavity and the motor cavity are sealed by an oil seal, the docking seam between the motor cavity and the electric control cavity is sealed by sealant, and the sealing plug on the electric control is sealed by an O-ring sealant. Due to the co-cavity design of the motor and the electric control, after the seals at each part age, condensation is likely to occur in the electric control cavity and the motor cavity, causing corrosion of the bare copper and silicon steel sheet structures, and then leading to early failure faults such as electrochemical corrosion resulting in copper wire breakage and electrical circuit open circuit.

[0056] Refer to Figure 4 , this embodiment provides a corrosion-resistant structure for a water-cooled electric drive system, including,

[0057] The first accommodating member 1;

[0058] The second accommodating member 2, which contains the fluid 3 inside;

[0059] The isolation member 4, which can isolate the internal spaces of the first accommodating member 1 and the second accommodating member 2;

[0060] When the temperature inside the first accommodating member 1 rises, the isolation member 4 can release the isolation of the internal spaces of the first accommodating member 1 and the second accommodating member 2.

[0061] During use, by means of temperature rise, the fluid 3 is controlled to enter the inside of the first accommodating member 1. The fluid 3 can be selected as a fluid with special properties such as an antirust liquid or antirust oil. After the fluid 3 flows into the inside of the first accommodating member 1, the performance of the first accommodating member 1 can be enhanced.

[0062] Refer to Figure 4 , as an alternative embodiment: it further includes a rotating body 5, and the rotating body 5 is arranged in the first accommodating member 1; the rotating body 5 is rotatably connected to the first accommodating member 1, and the rotating body 5 can rotate.

[0063] When the isolating member 4 releases the isolation of the internal spaces of the first accommodating member 1 and the second accommodating member 2, the fluid 3 inside the second accommodating member 2 can reach the rotating surface of the rotating body 5.

[0064] When the fluid 3 falls on the rotating surface of the rotating body 5, due to the rotation of the rotating body 5, the fluid 3 will be scattered, or adhere to the rotating surface of the rotating body 5, and when the rotating body 5 rotates, it will be thrown out by centrifugal force and evenly sprinkled on the inner wall surface of the first accommodating member 1.

[0065] Preferably, the rotating body 5 is a motor rotor.

[0066] When the motor rotor is used as the rotating body 5, heat will be generated during its rotation, which can be used to open the isolating member 4. Moreover, the rotation of the motor rotor can scatter and throw out the falling fluid 3, so that the fluid 3 is evenly distributed on the inner wall surface of the first accommodating member 1.

[0067] Preferably, the fluid 3 is antirust oil.

[0068] The antirust oil can be reducer oil or transmission oil.

[0069] During the operation of the electric drive system, when the motor temperature reaches a certain temperature, the isolating member 4 opens, and a certain amount of antirust oil will flow to the surface of the motor rotor. Under the action of the motor temperature and speed, the antirust oil forms a mist and is evenly distributed in the motor electronic control cavity, forming an even antirust film on the surface of the components, playing a role in isolating air and water vapor, and thus delaying corrosion.

[0070] Utilize the characteristic that a small amount of antirust oil is easy to form a mist under the conditions of high temperature and high-speed shaking, and evenly distribute the antirust oil on the surface of electrical components, playing a role in isolating air and water vapor, and thus delaying the corrosion of easily corroded parts such as motors and resolvers.

[0071] As an alternative embodiment: the isolating member 4 includes,

[0072] a first contact end 41 and a second contact end 42;

[0073] When the first contact end 41 and the second contact end 42 are in contact, the internal spaces of the first accommodating member 1 and the second accommodating member 2 are isolated;

[0074] When the first contact end 41 and the second contact end 42 are not in contact, the isolation of the internal spaces of the first accommodating member 1 and the second accommodating member 2 is released;

[0075] It further includes a deformation element 43 for controlling the distance between the first contact end 41 and the second contact end 42. After the temperature rises, the distance between the first contact end 41 and the second contact end 42 increases when the deformation element 43 is heated.

[0076] During use, as the temperature inside the first accommodating member 1 rises, the rising temperature causes the deformation element 43 to deform, thereby moving the first contact end 41 and the second contact end 42 away from each other. When the first contact end 41 and the second contact end 42 are not in contact, the internal space isolation between the first accommodating member 1 and the second accommodating member 2 is released, and the rust preventive oil can enter the first accommodating member 1 and be scattered and flung by the rotating body 5.

[0077] Refer to Figure 5 and Figure 6 As an alternative embodiment: The first contact end 41 is provided with a lower support end 411 and an upper support end 412; both the lower support end 411 and the upper support end 412 are hollow structures to facilitate the flow of the rust preventive oil.

[0078] The deformation element 43 includes a push rod 431 provided on the upper support end 412, and a storage sleeve 432 slidably disposed outside the push rod 431. Paraffin wax 433 is provided inside the storage sleeve 432. A support spring 434 is also provided between the lower support end 411 and the second contact end 42.

[0079] The push rod 431 is fixedly connected to the upper support end 412. In the initial state, when the paraffin wax 433 is not heated, it is in a solid state. One end of the push rod 431 is inserted into the storage sleeve 432, and the storage sleeve 432 is fixedly connected to the second contact end 42. When the paraffin wax 433 is heated, it will turn into a liquid state. After the paraffin wax 433 turns into a liquid state, its volume expands, pushing the push rod 431 to slide out of the storage sleeve 432, thereby compressing the support spring 434, moving the second contact end 42 away from the first contact end 41, and opening the channel between the first contact end 41 and the second contact end 42 for the rust preventive oil to flow.

[0080] Refer to Figure 7 and Figure 8 As an alternative embodiment: The first contact end 41 is provided with a lower support end 411;

[0081] The deformation element 43 is a shape memory alloy bracket 435;

[0082] The shape memory alloy bracket 435 is disposed between the lower support end 411 and the second contact end 42.

[0083] The shape memory alloy bracket 435 is in a stretched state. The stretched shape memory alloy bracket 435 can withstand the second contact end 42, causing the second contact end 42 to contact the first contact end 41, thereby preventing the anti-rust oil from falling. After the shape memory alloy bracket 435 is heated, it has the ability to recover its deformation, so it will cause the second contact end 42 to move away from the first contact end 41, opening the channel between the first contact end 41 and the second contact end 42 for the anti-rust oil to flow.

[0084] Referring to Figure 9 and Figure 10 , as an alternative embodiment: an upper support end 412 is provided on the first contact end 41;

[0085] The deformation element 43 is a thermal expansion alloy column 436;

[0086] Both ends of the thermal expansion alloy column 436 are respectively connected to the upper support end 412 and the second contact end 42.

[0087] During use, since the thermal expansion alloy column 436 expands when heated, its length will increase, which can cause the first contact end 41 and the second contact end 42 to move away from each other, opening the channel between the first contact end 41 and the second contact end 42 for the anti-rust oil to flow.

[0088] Referring to Figure 3 , this embodiment provides a corrosion-resistant structure for a water-cooled electric drive system, including

[0089] A receiving space 200 is provided on the motor cavity 100;

[0090] A temperature control switch 300 is provided between the motor cavity 100 and the receiving space 200;

[0091] Anti-rust oil 400 is filled in the receiving space;

[0092] After the temperature of the motor cavity 100 rises, the temperature control switch 300 is turned on to inject anti-rust oil 400 into the motor cavity 100.

[0093] When the motor rotor of the water-cooled electric drive system is working, heat is generated. After the temperature rises to a certain level, the temperature control switch 300 is turned on, and the antirust oil 400 is injected into the motor cavity 100. The motor cavity 100 and the electronic control cavity are in a connected state. The antirust oil 400 falling on the motor rotor will be dispersed. In the high-temperature environment, the antirust oil 400 will be atomized. The atomized antirust oil can be evenly distributed in the electronic control cavity and the motor cavity with the rotation of the motor rotor. And with the rotation of the motor rotor, the oil mist can enter into each gap. Therefore, finally, a uniform oil film can be formed. After the subsequent equipment stops, the oil film can protect the internal electronic devices and metal surfaces. By using the characteristic that a small amount of antirust oil 400 is easy to form a mist under high temperature and high-speed shaking conditions, the antirust oil 400 is evenly distributed on the surfaces of electrical components, playing a role in isolating air and water vapor, and thus delaying the corrosion of easily corroded parts such as motors and resolvers.

[0094] Moreover, when working again later, the increase in the temperature inside the motor cavity 100 will not affect the performance of the antirust oil 400. The antirust oil 400 can be injected in multiple times or in a one-time injection method to form multiple layers of oil films in the equipment or form a single layer at one time. The formed oil film can provide long-term protection for the interior later. After the seal of the electric drive system fails, it can still effectively protect the internal electronic devices and metal, improving the service life.

[0095] Preferably, the temperature control switch 300 is a thermostat.

[0096] The thermostat is a commonly used and mature part in automotive thermal management. Using its heat-operated switch principle, the antirust oil 400 stored inside is put into the motor cavity 100 under specific temperature conditions.

[0097] Preferably, for the thermostat: the initial opening temperature is 100 °C, the full opening temperature is 120 °C; the single-time dosage of the antirust oil is 0.5 - 0.8 ml.

[0098] Finally, it should be pointed out that the methods and devices described in detail above are only examples, and those skilled in the art can modify these examples in different ways as long as they do not depart from the scope of the present invention.

Claims

1. A corrosion-resistant structure of a water-cooled electric drive system, characterized in that: Comprising, a first accommodating member (1); a second accommodating member (2) which is internally filled with a fluid (3); a separator (4) which can isolate the internal spaces of the first accommodating member (1) and the second accommodating member (2); When the temperature inside the first accommodating member (1) rises, the separator (4) can lift the isolation of the internal spaces of the first accommodating member (1) and the second accommodating member (2).

2. The corrosion-resistant structure of the water-cooled electric drive system according to claim 1, characterized in that: It further comprises a rotating body (5) which is arranged inside the first accommodating member (1); When the separator (4) lifts the isolation of the internal spaces of the first accommodating member (1) and the second accommodating member (2), the fluid (3) inside the second accommodating member (2) can reach the rotating surface of the rotating body (5).

3. The corrosion-resistant structure of the water-cooled electric drive system according to claim 2, wherein: The rotating body (5) is a motor rotor.

4. The corrosion-resistant structure of the water-cooled electric drive system according to claim 3, wherein: The fluid (3) is rust preventive oil.

5. The corrosion-resistant structure of the water-cooled electric drive system according to any one of claims 1 to 4, characterized in that: The separator (4) comprises, a first contact end (41) and a second contact end (42); When the first contact end (41) and the second contact end (42) are in contact, the internal spaces of the first accommodating member (1) and the second accommodating member (2) are isolated; When the first contact end (41) and the second contact end (42) are not in contact, the isolation of the internal spaces of the first accommodating member (1) and the second accommodating member (2) is lifted; It further comprises a deformation element (43) which is used to control the distance between the first contact end (41) and the second contact end (42). After the temperature rises, the distance between the first contact end (41) and the second contact end (42) increases for the deformation element (43).

6. The corrosion-resistant structure of the water-cooled electric drive system according to claim 5, wherein: A lower support end (411) and an upper support end (412) are arranged on the first contact end (41); The deformation element (43) comprises a push rod (431) arranged on the upper support end (412), and a storage sleeve (432) slidably arranged outside the push rod (431). Paraffin wax (433) is arranged inside the storage sleeve (432). A support spring (434) is further arranged between the lower support end (411) and the second contact end (42).

7. The corrosion-resistant structure of the water-cooled electric drive system according to claim 5, characterized in that: A lower support end (411) is arranged on the first contact end (41); The deformation element (43) is a shape memory alloy bracket (435); The shape memory alloy bracket (435) is arranged between the lower support end (411) and the second contact end (42).

8. The corrosion-resistant structure of the water-cooled electric drive system according to claim 5, characterized in that: An upper support end (412) is arranged on the first contact end (41); The deformation element (43) is a thermal expansion alloy column (436); Two ends of the thermal expansion alloy column (436) are respectively connected to the upper support end (412) and the second contact end (42).

9. A corrosion-resistant structure for a water-cooled electric drive system, characterized in that: Comprising, An accommodating space (200) is arranged on the motor cavity (100); A temperature control switch (300) is arranged between the motor cavity (100) and the accommodating space (200); Rust preventive oil (400) is filled in the accommodating space; After the temperature of the motor cavity (100) rises, the temperature control switch (300) is turned on to inject rust preventive oil (400) into the motor cavity (100).

10. The corrosion-resistant structure of the water-cooled electric drive system according to claim 9, characterized in that: The temperature control switch (300) is a thermostat.

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