A junction box structure for preventing motor condensation

Abstract

The present invention relates to the technical field of motor junction boxes, and discloses a junction box structure for preventing motor condensation, which includes a junction box outer shell, a junction box inner plate and a junction box outer plate. The junction box outer shell has an open end, the junction box inner plate is detachably installed on the open end of the junction box outer shell, the junction box outer plate is fixed on the outer side wall of the junction box inner plate, and a condensation cavity is formed between the junction box outer plate and the junction box inner plate. An air window of the junction box inner plate for communicating the inner cavity of the junction box outer shell and the condensation cavity is opened at the upper part of the junction box inner plate. When the motor is running, the hot air contacts the inner wall of the junction box outer plate in the condensation cavity. Due to the temperature reduction, the moisture in the gas will be precipitated to form condensed water. With the vibration of the motor during operation, the condensed water will fall into the condensation cavity, thus ensuring that the condensation will not contact the internal circuit, avoiding the damage and corrosion of the power line insulation caused by the condensation, and improving the reliability of the drive motor.

Description

Technical Field

[0001] The present invention relates to the technical field of motor junction boxes, and specifically to a junction box structure for preventing motor condensation. Background Art

[0002] Permanent magnet synchronous drive motors for automobiles are generally small in size and have high sealing requirements, generally reaching the IP67 level. When the motor is running, it will generate heat, and the internal gas pressure will increase. After the motor stops running, the temperature decreases, and the internal gas pressure will decrease. When the internal gas pressure of the motor changes, gas exchange with the outside world is required. The currently common solution is to install a waterproof breathable valve on the motor, which can prevent moisture from passing through while allowing gas to pass through.

[0003] Although the waterproof breathable valve can prevent visible water from entering and leaving the motor, due to the certain humidity of the air, the moisture in the air will precipitate as the temperature of the gas entering the motor changes. This phenomenon of liquid water precipitation is called "condensation".

[0004] Motor condensation mainly occurs in the following two situations:

[0005] 1. Appears in the heating stage. The internal temperature of the motor is higher than the outside. After the internal air is heated, it meets the housing with a temperature lower than the dew point temperature on the surface, and water vapor will condense on the housing wall to form condensation.

[0006] 2. Appears in the cooling stage. The external environmental temperature is low, so the housing wall is lower than the internal air temperature. If the inner wall temperature 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, current is passed through the stator winding, and the internal temperature of the motor rises. The water vapor in the motor will rise to the junction box. Since the junction box is in contact with the outside world and the temperature drops rapidly, the water vapor will liquefy and condense into dew on the inner wall of the junction box. The condensation will accumulate inside the junction box, causing damage to the insulation of the motor, reducing the service life, and affecting the normal use of the motor and driving safety.

[0008] Currently, there are various measures for preventing condensation. For example, a rubber pad is pasted on the rear cover to prevent the temperature difference between the inside and outside of the junction box cover from being too large. However, due to the large area of the junction box, problems during long-term use cannot be avoided. Summary of the Invention

[0009] In view of the deficiencies of the prior art, the present invention provides a junction box structure for preventing motor condensation, which can avoid the condensation water generated at the junction box during the operation of the motor from accumulating at the power cord, and the condensation water does not come into contact with the electrical components in the junction box, protecting the insulation of the internal circuit of the motor from being damaged and corroded. It has the advantage of reducing the air humidity inside the motor, and solves the problem that the inner wall of the existing junction box will liquefy and condense into dew drops, causing damage to the insulation of the motor and reducing its service life.

[0010] To achieve the above object, the present invention provides the following technical solutions:

[0011] A junction box structure for preventing motor condensation, comprising a junction box outer shell, a junction box inner plate and a junction box outer plate.

[0012] The junction box outer shell has an open end, the junction box inner plate is detachably mounted on the open end of the junction box outer shell, the junction box outer plate is fixed on the outer side wall of the junction box inner plate, and a condensation cavity is formed between the junction box outer plate and the junction box inner plate.

[0013] An air window of the junction box inner plate is provided at the upper part of the junction box inner plate for communicating the inner cavity of the junction box outer shell and the condensation cavity.

[0014] In a further optional aspect of the above solution, a condensation component is provided in the condensation cavity. The condensation component includes a condensation part provided in the condensation cavity, and the condensation part exchanges heat with the air in the condensation cavity to condense water vapor into condensate.

[0015] In a further optional aspect of the above solution, the condensation part is a condensation column. One end of the condensation column is fixedly connected to the inner wall of the junction box outer plate, and the other end extends towards the junction box inner plate. There is a certain interval between the other end of the condensation column and the junction box inner plate.

[0016] In a further optional aspect of the above solution, a drain port communicating with the condensation cavity is provided at the bottom of the junction box outer plate, and a drain control device for controlling the opening / closing of the drain hole is installed on the drain port.

[0017] In a further optional aspect of the above solution, the drain control device is a plug bolt detachably installed on the drain port. When the plug bolt is installed, the drain port is closed, and when the plug bolt is removed, the drain port is opened.

[0018] In a further optional aspect of the above solution, an overflow port communicating with the condensation cavity is provided on the junction box outer plate. There is a certain interval between the overflow port and the bottom wall of the condensation cavity. When the condensate in the condensation cavity accumulates to the overflow port, it is discharged.

[0019] Further optionally, a heat dissipation component is provided on the outer wall of the outer plate of the junction box. The heat dissipation component includes a heat dissipation part, and the heat dissipation part dissipates heat from the outer plate of the junction box by using the principle of heat conduction.

[0020] Further optionally, the heat dissipation part is a heat sink, and a plurality of the heat sinks are fixed on the outer wall of the outer plate of the junction box.

[0021] Further optionally, a partition is provided on the inner wall of the outer plate of the junction box. When the inner plate and the outer plate of the junction box are assembled, the outer wall of the partition is attached to the outer wall of the inner plate of the junction box. The partition divides the condensation cavity into an upper condensation cavity and a lower water storage cavity. A water passing hole for communicating the upper condensation cavity and the lower water storage cavity is provided on the partition. The condensation component is arranged in the upper condensation cavity, and the drain port communicates the lower water storage cavity with the external environment.

[0022] Further optionally, the inner plate and the outer plate of the junction box are fastened to the open end of the junction box housing through the same connecting piece.

[0023] Compared with the prior art, the present invention provides a junction box structure for preventing motor condensation, which has the following beneficial effects:

[0024] 1. For the junction box structure for preventing motor condensation, by providing an inner plate and an outer plate of the junction box at the open end of the junction box housing, a condensation cavity is formed between the inner plate and the outer plate of the junction box, so that the condensation generated in the junction box is stored in the condensation cavity and does not contact the internal circuit, avoiding the damage and corrosion of the insulation of the power line by the condensation, and improving the reliability of the driving motor.

[0025] 2. For the junction box structure for preventing motor condensation, by providing a drainage component in the condensation cavity, it is convenient to drain the condensed water in the condensation cavity, reducing the air humidity inside the motor.

[0026] 3. For the junction box structure for preventing motor condensation, by providing a condensation component in the condensation cavity and a heat dissipation component on the outer wall of the junction box housing, it is convenient for the moisture in the hot air to quickly precipitate, form condensed water and be stored in the lower water storage cavity, reducing the air humidity inside the motor.

[0027] 4. For the junction box structure for preventing motor condensation, by providing a partition in the outer plate of the junction box to divide the condensation cavity into an upper condensation cavity and a lower water storage cavity, the condensed water is stored in the lower water storage cavity through the water passing hole of the partition, which can effectively prevent the stored condensed water from returning to the motor again. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] The following further describes the present invention in detail with reference to the drawings and specific embodiments.

[0029] Figure 1 Front view of the embodiment of the junction box structure for preventing motor condensation of the present invention;

[0030] Figure 2 Cross-sectional view of the embodiment of the junction box structure for preventing motor condensation of the present invention;

[0031] Figure 3 Exploded view of the embodiment of the junction box structure for preventing motor condensation of the present invention;

[0032] Figure 4 Schematic diagram of the inner plate structure of the junction box in the embodiment of the junction box structure for preventing motor condensation of the present invention;

[0033] Figure 5 Schematic diagram of the outer plate structure of the junction box in the embodiment of the junction box structure for preventing motor condensation of the present invention;

[0034] Figure 6 Schematic diagram of the overflow port structure in the embodiment of the junction box structure for preventing motor condensation of the present invention;

[0035] Figure 7 Schematic diagram of the usage state in the embodiment of the junction box structure for preventing motor condensation of the present invention.

[0036] In the figure: 1. Junction box housing; 2. Inner plate of the junction box; 3. Outer plate of the junction box; 4. Cavity; 5. Air window of the inner plate of the junction box; 6. Partition; 7. Overflow port; 8. Condensation assembly; 81. Condensation column; 9. Heat dissipation assembly; 91. Heat sink; 10. Water passing hole; 11. Upper condensation cavity; 12. Lower water storage cavity; 13. Entrance of the inner power cord; 14. Entrance of the outer power cord; 15. Drain hole; 16. Drain bolt. Detailed implementation manners

[0037] 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 of the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0038] Embodiment 1

[0039] Please refer to Figures 1-5 As shown, a junction box structure for preventing motor condensation includes a junction box housing 1, an inner plate 2 of the junction box, and an outer plate 3 of the junction box.

[0040] The junction box housing 1 has an open end. The inner plate 2 of the junction box is detachably mounted on the open end of the junction box housing 1. The outer plate 3 of the junction box is fixed on the outer side wall of the inner plate 2 of the junction box and forms a condensation cavity 4 with the inner plate 2 of the junction box.

[0041] An air window 5 for connecting the inner cavity of the junction box housing 1 and the condensation cavity 4 is provided at the upper part of the inner plate 2 of the junction box.

[0042] When the motor is running, the temperature of its stator rises, causing the temperature of the gas inside the motor to rise. The heated air enters the cavity of the junction box housing 1 through the installation end of the junction box housing 1. The air in the cavity of the junction box housing 1 will also be heated by the power cord. The hot air enters the condensation cavity 4 between the inner plate 2 of the junction box and the outer plate 3 of the junction box through the air window 5 on the inner plate 2 of the junction box; the outside of the outer plate 3 of the junction box is in contact with the atmospheric environment, which is relatively low in temperature. The hot air contacts the inner wall of the outer plate 3 of the junction box in the condensation cavity 4. Due to the temperature drop, the moisture in the gas will be precipitated to form condensed water. With the vibration of the motor during operation, the condensed water will fall into the condensation cavity 4, thus ensuring that the condensed dew will not contact the internal circuit, avoiding the damage and corrosion of the power line insulation by the condensed dew, and improving the reliability of the drive motor.

[0043] Please refer to Figure 2 and Figure 5 As shown, a condensation component 8 is provided in the condensation cavity 4. The condensation component 8 includes a condensation part provided in the condensation cavity. The condensation part exchanges heat with the air in the condensation cavity 4 to condense the water vapor to form condensed dew, facilitating the rapid precipitation of the moisture in the hot air and reducing the humidity of the air inside the motor;

[0044] The condensation part is a condensation sheet; or a condensation column 81. One end of the condensation column 81 is fixedly connected to the inner wall of the outer plate 3 of the junction box, and the other end extends towards the inner plate 2 of the junction box. There is a certain interval between the other end of the condensation column 81 and the inner plate 2 of the junction box. A number of condensation columns 81 are evenly arranged. When the hot air contacts the relatively low-temperature condensation columns 81, the moisture can be rapidly precipitated, reducing the humidity of the air inside the motor.

[0045] Please refer to Figure 2 and Figure 3 As shown, a drain port 15 communicating with the condensation cavity 4 is provided at the bottom of the outer plate 3 of the junction box, and a drain control device for controlling the opening / closing of the drain hole is installed on the drain port 15;

[0046] The drain control device is a drain valve; or a plug bolt 16 detachably installed on the drain port 15. When the plug bolt 16 is installed, the drain port 15 is closed, and when the plug bolt 16 is removed, the drain port 15 is opened.

[0047] Please refer to Figure 6As shown, an overflow port 7 communicating with the condensation cavity 4 is formed on the outer plate 3 of the junction box. There is a certain interval between the overflow port 7 and the bottom wall of the condensation cavity 4, which can accumulate a certain amount of condensed water. When the condensed water in the condensation cavity 4 gathers at the overflow port 7, it is discharged, thus preventing excessive accumulation of condensed water in the condensation cavity 4 and preventing the condensed water from flowing back to the junction box housing 1 through the air window 5 of the inner plate of the junction box.

[0048] Please refer to Figure 1 and Figure 3 As shown, a heat dissipation component 9 is provided on the outer wall of the outer plate 3 of the junction box, including a heat dissipation part. The heat dissipation part dissipates heat from the outer plate of the junction box by using the principle of heat conduction. The heat dissipation part can quickly reduce the temperature of the outer plate 3 of the junction box and the condensation component 8, so that moisture is quickly separated out, reducing the air humidity inside the motor.

[0049] The heat dissipation part is a heat dissipation column; or heat dissipation fins 91. The heat dissipation fins 91 are fixed on the outer wall of the outer plate 3 of the junction box. A number of heat dissipation fins 91 are evenly arranged. When the vehicle is running, the airflow in the external environment will pass through the heat dissipation fins 91, which can keep the outer plate 3 of the junction box and the condensation component 8 at a relatively low temperature all the time, and keep the water in the high-temperature gas inside the motor separated out.

[0050] Please refer to Figure 2 and Figure 5 As shown, a partition 6 is provided on the inner wall of the outer plate 3 of the junction box. When the inner plate 2 and the outer plate 3 of the junction box are assembled, the outer wall of the partition 6 is in contact with the outer wall of the inner plate 2 of the junction box. The partition 6 divides the cavity 4 into an upper condensation cavity 11 and a lower water storage cavity 12. A water passing hole 10 for communicating the upper condensation cavity 11 and the lower water storage cavity 12 is formed in the middle of the partition 6. The condensation component 8 is arranged in the upper condensation cavity 11, and a drain port 15 connects the lower water storage cavity 12 with the external environment.

[0051] The lower water storage cavity 12 has a certain volume and can store a certain amount of condensed water. During the period when the vehicle stops running, if the condensed water stored in it evaporates into water vapor, only a part of it will flow upward through the water passing hole 10 and will condense into condensed water again when passing through the outer plate 3 of the junction box, which can effectively prevent the stored condensed water from flowing back into the motor again.

[0052] Please refer to Figures 1-3 As shown, the inner plate and the outer plate of the junction box are fastened to the open end of the junction box housing through the same connecting piece, which is convenient for the assembly of the inner plate and the outer plate of the junction box.

[0053] Please refer to Figure 7As shown, the junction box housing 1 is assembled on the outer wall of the motor body. An inner power cord inlet 13 is provided at the installation end of the junction box housing 1, facilitating the connection of the power cord and the stator wire. An outer power cord inlet 14 is provided on the outer wall of the junction box housing 1, facilitating the connection of the external power cord. After connecting the external power cord, the outer power cord inlet 14 is in a sealed state. The condensation cavity 4 is in a vertical state, and the upper condensation chamber 11 is located above the lower water storage chamber 12. When the motor is operating, the hot air contacts the inner wall of the junction box outer plate 3 and the condensation component 8 in the condensation cavity 4. Due to the temperature drop, the moisture in the gas will be precipitated to form condensed water. With the vibration of the motor during operation, the condensed water will fall into the lower water storage chamber 12, thus ensuring that the condensation dew does not contact the internal circuit, avoiding the damage and corrosion of the power line insulation caused by the condensation dew, and improving the reliability of the drive motor.

[0054] Working principle: Before use, assemble the junction box with the motor body. After the motor is fixedly installed, the condensation cavity 4 should be in a vertical state, and the upper condensation chamber 11 is located above the lower water storage chamber 12. When the motor is operating, the temperature of its stator rises, causing the temperature of the gas inside the motor to rise. The heated air enters the inner cavity of the junction box housing 1 through the inner power cord inlet 13. The air in the inner cavity of the junction box housing 1 will also be heated by the outer power cord. The hot air enters the condensation cavity 4 between the inner plate 2 and the outer plate 3 of the junction box through the air window 5 on the inner plate 2 of the junction box. The hot air contacts the inner wall of the junction box outer plate 3 and the condensation component 8 in the condensation cavity 4. Due to the temperature drop, the moisture in the gas will be precipitated to form condensed water. With the vibration of the motor during operation, the condensed water will fall into the lower water storage chamber 12, thus ensuring that the condensation dew does not contact the internal circuit, avoiding the damage and corrosion of the power line insulation caused by the condensation dew, and improving the reliability of the drive motor.

[0055] It should be noted that in this article, relational terms such as first and second are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the term "comprising", "including" or any other variant thereof is intended to cover non-exclusive inclusion, so that a process, method, article or device comprising a series of elements not only includes those elements, but also includes other elements not expressly listed, or also includes elements inherent to such process, method, article or device. Without further limitation, an element defined by the statement "comprising an..." does not exclude the existence of additional identical elements in the process, method, article or device comprising the element.

[0056] Although embodiments of the present invention have been shown and described, it will be understood by those of ordinary skill in the art that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principles and spirit of the present invention, and the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A junction box structure for preventing motor condensation, characterized in that: It includes a junction box housing, an inner plate of the junction box, and an outer plate of the junction box; the junction box housing is provided with an inner power cord inlet and an outer power cord inlet; The junction box housing has an open end, the inner plate of the junction box is detachably mounted on the open end of the junction box housing, the outer plate of the junction box is fixed on the outer side wall of the inner plate of the junction box, and a condensation cavity is formed between the outer plate of the junction box and the inner plate of the junction box; An air window of the inner plate of the junction box for communicating the inner cavity of the junction box housing and the condensation cavity is opened in the upper part of the inner plate of the junction box; A condensation component is arranged in the condensation cavity, the condensation component includes a condensation part arranged in the condensation cavity, and the condensation part exchanges heat with the air in the condensation cavity to condense water vapor to form condensed dew; the condensation part is a condensation column, one end of the condensation column is fixedly connected to the inner wall of the outer plate of the junction box, the other end extends towards the inner plate of the junction box, and there is a certain interval between the other end of the condensation column and the inner plate of the junction box.

2. The wiring box structure for preventing motor condensation according to claim 1, characterized in that: A drain port communicating with the condensation cavity is opened at the bottom of the outer plate of the junction box, and a drain control device for controlling the opening / closing of the drain hole is installed on the drain port.

3. The wiring box structure for preventing motor condensation according to claim 2, characterized in that: The drain control device is a plug bolt detachably installed on the drain port. When the plug bolt is installed, the drain port is closed, and when the plug bolt is removed, the drain port is opened.

4. The wiring box structure for preventing motor condensation according to claim 2, wherein: An overflow port communicating with the condensation cavity is opened on the outer plate of the junction box, and there is a certain interval between the overflow port and the bottom wall of the condensation cavity. When the condensed water in the condensation cavity accumulates at the overflow port, it is discharged.

5. The wiring box structure for preventing motor condensation according to claim 1, characterized in that: A heat dissipation component is arranged on the outer wall of the outer plate of the junction box, the heat dissipation component includes a heat dissipation part, and the heat dissipation part dissipates heat from the outer plate of the junction box by using the principle of heat conduction.

6. The wiring box structure for preventing motor condensation according to claim 5, characterized in that: The heat dissipation part is a heat sink, and a plurality of the heat sinks are fixed on the outer wall of the outer plate of the junction box.

7. The wiring box structure for preventing motor condensation according to claim 2, characterized in that: A partition is arranged on the inner wall of the outer plate of the junction box. When the inner plate of the junction box and the outer plate of the junction box are assembled, the outer wall of the partition is attached to the outer wall of the inner plate of the junction box. The partition divides the condensation cavity into an upper condensation cavity and a lower water storage cavity. A water passing hole for communicating the upper condensation cavity and the lower water storage cavity is opened on the partition. The condensation component is arranged in the upper condensation cavity, and the drain port communicates the lower water storage cavity with the external environment.

8. The wiring box structure for preventing motor condensation according to claim 1, characterized in that: The inner plate of the junction box and the outer plate of the junction box are fastened to the open end of the junction box housing by the same connecting piece.

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