A new type of motor junction box, motor and smart home appliance

Abstract

The present invention provides a novel motor junction box, motor and intelligent household appliance, including a semi-enclosed box structure and a box body, wherein the semi-enclosed box structure is arranged in the box body, and the semi-enclosed box structure includes a main body, a support frame and a vent hole, wherein the support frame and the vent hole are both arranged on the outer wall surface of the main body, and the support frame is against the outer wall surface of the main body and the inner wall surface of the box body, and a water outlet mechanism is also arranged at the bottom of the box body. By adding a semi-enclosed box structure and a water outlet mechanism to the original motor junction box, condensation in the junction box occurs between the outer wall surface of the semi-enclosed box structure and the inner wall surface of the box body, and the condensed water droplets do not contact other components in the box body, and the wall surface is protected from damage and corrosion to the insulation of the internal circuit of the motor by condensation. The added water outlet mechanism can regularly empty the condensed water in the box body, reduce the air humidity inside the motor, and improve the safety and reliability of the motor.

Description

Technical Field

[0001] The present invention relates to the technical field of motors, and particularly to a novel motor junction box, a motor and an intelligent household appliance. Background Art

[0002] Facing the increasingly severe problems such as environmental pollution and resource shortage, new energy vehicles have become the future development direction of the current automotive industry. The drive motor system is one of the three core components of new energy vehicles, and the reliability of the drive motor directly affects the driving safety of the vehicle.

[0003] Air is mainly composed of dry air, water vapor and dust. Usually, humidity refers to the content of water vapor in the air, which can be expressed by relative humidity, absolute humidity and saturation humidity. Saturation humidity is the maximum limit of water vapor that a unit volume of air can contain under certain humidity conditions; absolute humidity is the mass of water vapor in a certain volume of air; relative humidity is the ratio of absolute humidity to saturation humidity. Saturation humidity is related to the air temperature. The higher the temperature, the more moisture it contains. If the absolute humidity of the air remains unchanged and the air temperature is lowered, when the temperature drops to a certain value, the humidity in the air will reach saturation. If the temperature is further lowered, the moisture in the air will precipitate. This phenomenon of liquid water precipitation is called "condensation". The dew point temperature is the temperature at which the air humidity can reach 100% on the premise that the moisture content and atmospheric pressure remain unchanged.

[0004] The condensation phenomenon mainly occurs in the following two cases:

[0005] (1) It appears in the heating stage. During the heating process, the surface temperature of the housing is lower than the ambient temperature. When the air on the outer wall of the housing encounters an object surface with a temperature lower than the dew point temperature, water vapor will condense on the outer wall of the housing to form condensation.

[0006] (2) It appears in the cooling stage. The external environment cools down first, so the inner wall of the housing is lower than the internal air temperature. If the temperature of the inner wall of the housing reaches the dew point temperature of the internal air, condensation will form on the inner wall of the housing.

[0007] When the drive motor is running, three-phase alternating current is applied to the stator winding, and the temperature inside the motor rises. The water vapor inside the motor will rise to the junction box. Since the junction box is in contact with the outside world, the temperature drops rapidly. The water vapor will liquefy and condense into dew on the inner wall of the junction box. When the vehicle vibrates during driving, the dew will fall and flow into the internal winding through the wiring hole. Some of the dew scatters on the high-voltage line, reducing the insulation resistance of the drive motor, shortening the service life, and affecting the normal use of the motor and driving safety.

[0008] Such as Figure 1 and Figure 2The following is a schematic diagram of the structure of an existing drive motor junction box. The junction box cover plate 6 is fixed by screws, forming a closed space inside the box body 1. During the operation of the motor, the internal temperature rises, causing the water vapor inside the motor to volatilize and form hot vapor. The hot vapor enters the box body 1 through the original wire outlet 3. The outer wall 4 of the junction box is in contact with the outside world, and the temperature of the inner wall 8 of the junction box drops faster than the temperature of the air inside the junction box. When the temperature of the inner wall 5 of the junction box drops to the dew point temperature, dew forms on the surface of the inner wall 5 of the junction box.

[0009] To solve the problem of condensation on the inner wall of the motor junction box, existing technologies mostly spray heat insulation layers or anti-corrosion layers on the inner and outer wall surfaces of the motor housing, or add heat insulation pads on the inner wall of the junction box to eliminate the difference in heat conduction, reduce condensation inside the motor, ensure the normal operation of the motor, and extend its service life. However, such practices will increase the difficulty of the motor production process and increase the manufacturing cost of the motor. Summary of the Invention

[0010] Aiming at the deficiencies of the existing technology, the present invention proposes a new type of motor junction box. By adding a semi-closed box structure and a water outlet mechanism to the original motor junction box, the condensation generated in the junction box will not come into contact with the internal lines, avoiding the damage and corrosion of the insulation of the power transmission lines caused by condensation, and improving the reliability of the drive motor.

[0011] To achieve the above object, the present invention adopts the following technical solutions:

[0012] A new type of motor junction box includes a semi-closed box structure and a box body. The semi-closed box structure is arranged inside the box body. The semi-closed box structure includes a main body, a support skeleton, and ventilation holes. The support skeleton and the ventilation holes are both arranged on the outer wall surface of the main body. The support skeleton abuts between the outer wall surface of the main body and the inner wall surface of the box body. A water outlet mechanism is also arranged at the bottom of the box body. By adding a semi-closed box structure and a water outlet mechanism to the original motor junction box, the condensation in the junction box occurs between the outer wall surface of the semi-closed box structure and the inner wall surface of the box body. The condensed water droplets do not come into contact with other components inside the box body, avoiding the damage and corrosion of the insulation of the internal lines of the motor by condensation. The added water outlet mechanism can regularly drain the condensed water in the box body, reduce the air humidity inside the motor, and improve the safety and reliability of the motor.

[0013] Furthermore, a notch is also arranged on the outer wall surface of the main body, and the notch is arranged on the support skeleton. The size of the notch is designed according to the length of the support skeleton and the size of the box body, so that the liquid formed by condensation on each surface of the box body flows out through the notch, accumulates on the bottom surface of the junction box, and finally the accumulated water is discharged through the water outlet mechanism. On the one hand, it ensures that the liquid formed by condensation will not stay on the surface of the box body for a long time, and on the other hand, it ensures the flow rate of the liquid, ensuring the safety of the internal lines of the box body.

[0014] Further, an inlet and an outlet are provided on the outer wall surface of the main body. A first protrusion is provided on the edge of the inlet, and a second protrusion is provided on the edge of the outlet. The inlet is used for the access of the electric wire, and the outlet is used for the connection of the electric wire. The first protrusion and the second protrusion are used to ensure the sealing of the electric wire and play a role in positioning and fixing.

[0015] Further, a cover plate is sleeved on the main body, and the cover plate and the main body are of a detachable structure. The cover plate is also provided with a support skeleton and a ventilation hole, which is beneficial to the liquid flow. The designed detachable mechanism can facilitate operations such as disassembly and repair and component replacement.

[0016] Further, the water outlet structure is specifically a bolt, and a plurality of bolts are provided at the bottom of the box body. The bolts facilitate the operator to drain water manually, and the quantity and position of the bolts can be set according to the actual situation of the junction box to achieve a better drainage effect.

[0017] Further, the ventilation hole is specifically a conical structure. When the wind flows from the large opening to the small opening of the conical ventilation hole, the air is squeezed and released from the small hole, which can be regarded as a small throttling expansion, and it will cause a decrease in the air temperature. During the diffusion process of the air from the inside to the outside, the air is compressed and releases heat, and the released heat will be used to raise the temperature of the semi-closed box structure to avoid the occurrence of condensation on the inner wall of the semi-closed box structure.

[0018] Further, the box body is provided with a first concave platform with a size adapted to the position of the first protrusion, and the box body is provided with a second concave platform with a size adapted to the position of the second protrusion. The first concave platform is installed in cooperation with the first protrusion, and the second concave platform is installed in cooperation with the second protrusion, so that the assembly of the semi-closed box structure and the box body is stable.

[0019] Further, the support skeleton is made of a material with a high heat conductivity. By selecting a material with a high heat conductivity, the support skeleton itself makes the structure have no other contact surfaces with the inner wall of the box body except for the contact part between the support skeleton and the box body, ensuring that the temperature of the semi-closed box structure is consistent with the temperature inside the motor, so that condensation occurs between the outer wall of the semi-closed box structure and the inner wall of the box body, ensuring that the dew will not affect the insulation of the high-voltage wire of the motor and the internal winding of the motor.

[0020] A motor includes a motor junction box, and the motor junction box is specifically the novel motor junction box described in any one of the above.

[0021] An air conditioner includes an indoor unit and an outdoor unit. Motors are provided on both the outdoor unit and the indoor unit, and a motor junction box is provided on the motor. The motor junction box is specifically the novel motor junction box described in any one of the above.

[0022] An intelligent household appliance includes a motor, and a motor junction box is arranged on the motor. The motor junction box is specifically the novel motor junction box described in any one of the above.

[0023] The beneficial effects of the novel motor junction box, the motor and the intelligent household appliance provided by the present invention are as follows: By adding a semi-closed box structure and a water outlet mechanism to the original motor junction box, the condensation in the junction box occurs between the outer wall surface of the semi-closed box structure and the inner wall surface of the box body. The condensed water droplets do not come into contact with other components in the box body, preventing the condensation from damaging and corroding the insulation of the internal circuit of the motor. The added water outlet mechanism can regularly drain the condensed water in the box body, reduce the air humidity inside the motor, and improve the safety and reliability of the motor. Description of the Drawings

[0024] Figure 1 It is a top view of the structure of the original motor junction box;

[0025] Figure 2 It is a cross-sectional view of the structure of the original motor junction box;

[0026] Figure 3 It is a top view of the semi-closed box structure of the present invention;

[0027] Figure 4 It is an axonometric view A of the semi-closed box structure of the present invention;

[0028] Figure 5 It is an axonometric view B of the semi-closed box structure of the present invention;

[0029] Figure 6 It is a schematic diagram of the cover plate structure of the present invention;

[0030] Figure 7 It is a schematic diagram of the general assembly of the semi-closed box structure of the present invention;

[0031] Figure 8 It is a schematic diagram of the vent hole structure of the present invention;

[0032] Figure 9 It is a schematic diagram of the overall structure of the motor junction box of the present invention;

[0033] Figure 10 It is a cross-sectional view of the overall structure of the motor junction box of the present invention.

[0034] In the figure: 1. Box body; 2. Screw hole; 3. Original wire outlet; 4. Outer avoidance of junction box; 5. Inner wall of junction box; 6. Cover plate of junction box; 7. Power line inlet; 8. Inner wall of cover plate of junction box; 9. Semi-closed box structure; 10. Wire outlet; 11. Support skeleton; 12. Second protrusion; 13. Ventilation hole; 14. Inlet; 15. Notch; 16. First protrusion; 17. Bolt; 18. Outer wall surface of semi-closed box structure; 19. First concave platform; 20. Second concave platform. Specific implementation mode

[0035] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0036] Please refer to Figures 1 to 10 。

[0037] Embodiment 1: A new type of motor junction box.

[0038] A new type of motor junction box includes a semi-closed box structure 9 and a box body 1. The semi-closed box structure 9 is arranged inside the box body 1. The semi-closed box structure 9 includes a main body 21, a support skeleton 11 and a ventilation hole 13. The support skeleton 11 and the ventilation hole 13 are both arranged on the outer wall surface of the main body 21. The support skeleton 11 abuts between the outer wall surface of the main body 21 and the inner wall surface of the box body 1. A water outlet mechanism is further arranged at the bottom of the box body 1, and the water outlet mechanism is specifically a bolt 17.

[0039] The support skeleton 11 arranged on the outer wall surface of the main body 21 reduces the contact area between the outer wall surface 18 of the semi-closed box structure and the inner wall surface of the box body 1. Since the support skeleton 11 is made of a material with high heat conductivity, the temperature of the outer wall surface 18 of the semi-closed box structure and the air inside the box body 1 is basically the same, so that condensation occurs between the outer wall surface 18 of the semi-closed box structure and the inner wall surface of the box body 1, avoiding the corrosion and damage of the transmission line caused by condensation.

[0040] On the premise of ensuring that the support skeleton 11 can reliably support the semi-closed box structure 9, the contact area between the support skeleton 11 and the inner wall of the box body 1 is as small as possible, reducing the heat transferred through the support skeleton 11 and ensuring that the temperature of the semi-closed box structure 9 is basically the same as the temperature of the air inside the box body 1.

[0041] The first protrusion 16 provided at the edge of the inlet 14, the second protrusion 12 provided at the edge of the outlet 10, and the first concave platform 19 and the second concave platform 20 provided at the corresponding positions of the box body 1 in the semi-closed box structure 9 are matched with each other during installation, that is, the first protrusion 16 is matched with the first concave platform 19, and the second protrusion 12 is matched with the second concave platform 20, to prevent dew from contacting the circuit.

[0042] Utilizing the throttling expansion effect, a number of vent holes 13 with a small outer and large inner shape are arranged in an appropriate area of the semi-closed box structure 9. While ensuring that the air temperature inside the semi-closed box structure 9 is basically the same as that inside the box body 1, a small amount of condensed water formed in the semi-closed box structure 9 can be discharged. The arrangement of the vent holes 13 should facilitate the discharge of condensed water while meeting the requirement of having a good ventilation function.

[0043] A notch 15 is opened on the support skeleton 11. The size and position of the notch 15 are determined by comprehensively considering the length of the support skeleton 11 and the size of the box body 1, so that the liquid formed by condensed water on each surface of the box body 1 flows out through the notch 15, accumulates on the bottom surface of the box body 1, and the accumulated water is discharged through the bolt 17 provided on the bottom surface of the box body 1.

[0044] The external shape structure of the semi-closed box structure 9 should be close to the internal shape of the box body 1. On the basis of ensuring that there is sufficient air gap between the two, the internal space of the semi-closed box structure 9 should be made as large as possible to leave enough electrical safety distance.

[0045] Embodiment 2: A motor.

[0046] A motor includes a motor junction box, and the motor junction box is specifically the new type of motor junction box as described in Embodiment 1.

[0047] Embodiment 3: An air conditioner.

[0048] An air conditioner includes an indoor unit and an outdoor unit. Motors are provided on both the outdoor unit and the indoor unit, and motor junction boxes are provided on the motors. The motor junction boxes are specifically the new type of motor junction boxes as described in Embodiment 1.

[0049] Embodiment 4: An intelligent household appliance.

[0050] An intelligent household appliance includes a motor, and a motor junction box is provided on the motor. The motor junction box is specifically the new type of motor junction box as described in Embodiment 1.

[0051] The above are the preferred embodiments of the present invention, but the present invention should not be limited to the content disclosed in this embodiment and the drawings. Therefore, all equivalent or modified implementations completed without departing from the spirit disclosed by the present invention fall within the protection scope of the present invention.

Claims

1. A motor junction box, characterized in that, it includes a semi-closed box mechanism and a box body. The semi-closed box mechanism is arranged inside the box body. The semi-closed box mechanism includes a main body, a support skeleton and a ventilation hole. The support skeleton and the ventilation hole are both arranged on the outer wall surface of the main body. The support skeleton abuts between the outer wall surface of the main body and the inner wall surface of the box body. A water outlet mechanism is also arranged at the bottom of the box body; a notch is also arranged on the outer wall surface of the main body, and the notch is arranged on the support skeleton.

2. The motor junction box according to claim 1, characterized in that, an inlet port and an outlet port are also arranged on the outer wall surface of the main body. A first protrusion is arranged on the edge of the inlet port, and a second protrusion is arranged on the edge of the outlet port.

3. The motor junction box according to claim 1, characterized in that, a cover plate is also sleeved on the main body, and the cover plate and the main body are a detachable mechanism.

4. The motor junction box according to claim 1, characterized in that, the water outlet mechanism is specifically a bolt, and several bolts are arranged at the bottom of the box body.

5. The motor junction box according to claim 1, characterized in that, the ventilation hole is specifically a conical mechanism.

6. The motor junction box according to claim 2, characterized in that, the box body is provided with a first concave platform with a size adapted to the first protrusion at the corresponding position of the first protrusion, and the box body is provided with a second concave platform with a size adapted to the second protrusion at the corresponding position of the second protrusion.

7. A motor includes a motor junction box, characterized in that, the motor junction box is specifically the motor junction box according to any one of claims 1-6.

8. An air conditioner includes an indoor unit and an outdoor unit. Motors are arranged on both the outdoor unit and the indoor unit, and a motor junction box is arranged on the motor, characterized in that, the motor junction box is specifically the motor junction box according to any one of claims 1-6.

9. An intelligent household appliance includes a motor, and a motor junction box is arranged on the motor, characterized in that, the motor junction box is specifically the motor junction box according to any one of claims 1-6.

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