Motor cooling system, compressor and air conditioning unit

Abstract

The present application provides a motor cooling system, a compressor and an air conditioning unit. The motor cooling system includes a shell and a motor winding installed in the shell. A zigzag cooling channel is formed in the middle of the shell in the longitudinal direction, and a left cooling cavity and a right cooling cavity are formed at both ends of the shell in the longitudinal direction, respectively. The zigzag cooling channel is connected to the left cooling cavity, and a flow channel connecting the left cooling cavity and the right cooling cavity is also formed in the shell. By applying the technical solution of the present invention, the refrigerant can be first introduced into the zigzag cooling channel, and the heat exchange time of the refrigerant for the motor winding can be extended by the zigzag cooling channel, so as to achieve effective cooling of the motor winding. Afterwards, the refrigerant flows into the left cooling cavity again to cool the components in the left cooling cavity, and finally flows into the right cooling cavity through the flow channel to cool the components in the right cooling cavity, thereby achieving sufficient cooling of the motor.

Description

Technical Field

[0001] The present invention relates to the technical field of refrigeration equipment, and in particular to a motor cooling system, a compressor and an air conditioning unit. Background Art

[0002] The existing semi-hermetic twin-screw compressor uses a solution where the motor directly drives the rotor. Since the motor and the rotor are in the same closed cavity, the motor cannot be cooled separately. Therefore, the conventional motor cooling solution is to allow the low-temperature refrigerant to enter the compressor from the air intake port, first pass through the motor part for cooling, and then enter the rotor meshing section.

[0003] Since cooling the motor windings has the highest priority, the refrigerant will be used to cool the motor windings first. In order to effectively cool the motor windings, a spiral cooling channel is formed on the inner surface of the housing to extend the heat exchange time of the refrigerant for the motor windings. As for the components in the space on both sides of the motor windings, the existing spiral cooling channel design can only cool the components in the space on one side of the motor windings, while there is a lack of good cooling methods for the components in the space on the other side of the motor windings, resulting in uneven cooling of the motor as a whole. Summary of the invention

[0004] The embodiments of the present invention provide a motor cooling system, a compressor and an air conditioning unit to solve the technical problem of uneven cooling of the motor as a whole of the compressor motor in the prior art.

[0005] An embodiment of the present application provides a motor cooling system, including a shell and a motor winding installed in the shell, a tortuous cooling channel is formed in the middle of the shell in the length direction, a left cooling cavity and a right cooling cavity are respectively formed at both ends of the shell in the length direction, the tortuous cooling channel is connected to one of the left cooling cavity and the right cooling cavity, and a flow channel connecting the left cooling cavity and the right cooling cavity is also formed in the shell.

[0006] In one embodiment, the flow passage is distributed in the housing between two ends of the tortuous cooling passage in the overall width direction.

[0007] In one embodiment, the tortuous cooling channel is an S-shaped cooling channel.

[0008] In one embodiment, a refrigerant inlet communicating with the tortuous cooling flow channel is provided on the shell.

[0009] In one embodiment, at least one air inlet opening connected to the refrigerant inlet is provided on the zigzag cooling channel.

[0010] In one embodiment, the cross section of the zigzag cooling channel is rectangular, trapezoidal or arc-shaped.

[0011] In one embodiment, the ratio of the width of the spacer between two adjacent channels of the zigzag cooling channel to the channel width of the zigzag cooling channel is 1:1 to 1:4.

[0012] In one embodiment, each flow channel of the zigzag cooling flow channel is arranged perpendicular to or at an angle to the central axis of the shell.

[0013] The present application also provides a compressor, including a motor cooling system and a compression end connected to the motor cooling system, and the motor cooling system is the above-mentioned motor cooling system.

[0014] In one embodiment, the compressor is a two-stage compressor, and the compression end includes a primary compression end and a secondary compression end, and the primary compression end and the secondary compression end are respectively connected to two ends of the motor cooling system.

[0015] In one embodiment, one of the left cooling cavity and the right cooling cavity is connected to the tortuous cooling flow channel, and the other of the left cooling cavity and the right cooling cavity is connected to one of the first compression end and the second compression end.

[0016] The present application also provides an air-conditioning unit, comprising a compressor, which is the above-mentioned compressor.

[0017] In the above embodiment, the refrigerant can be first introduced into the zigzag cooling channel, and the heat exchange time of the refrigerant for the motor winding can be extended by the zigzag cooling channel to achieve effective cooling of the motor winding. After that, the refrigerant flows into the left cooling chamber to cool the components in the left cooling chamber, and finally flows into the right cooling chamber through the flow passage to cool the components in the right cooling chamber, thereby achieving sufficient cooling of the motor. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] The drawings constituting a part of this application are used to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention. In the drawings:

[0019] Figure 1 is a schematic cross-sectional structural diagram of an embodiment of a compressor according to the present invention;

[0020] Figure 2 yes Figure 1 A schematic diagram of the three-dimensional structure of the rear half of the housing of the motor cooling system of the compressor;

[0021] Figure 3 yes Figure 1 A schematic diagram of the front view of the rear half of the housing of the motor cooling system of the compressor;

[0022] Figure 4 yes Figure 1Schematic diagram of the front half of the housing of the motor cooling system of the compressor

[0023] Figure 5 It is a schematic diagram of the unfolded structure of the tortuous cooling flow channel of the shell of the motor cooling system of the compressor according to the present invention. DETAILED DESCRIPTION

[0024] In order to make the purpose, technical solution and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the embodiments and the accompanying drawings. Here, the illustrative embodiments of the present invention and their descriptions are used to explain the present invention, but are not intended to limit the present invention.

[0025] Figure 1 , Figure 2 , Figure 3 and Figure 4 The embodiment of the motor cooling system of the present invention is shown, and the motor cooling system includes a housing 10 and a motor winding 20 installed in the housing 10. A zigzag cooling channel 11 is formed in the middle of the housing 10 in the longitudinal direction, and a left cooling cavity 12 and a right cooling cavity 13 are formed at both ends of the housing 10 in the longitudinal direction, respectively. The zigzag cooling channel 11 is connected to the left cooling cavity 12, and a flow passage 14 connecting the left cooling cavity 12 and the right cooling cavity 13 is also formed in the housing 10.

[0026] By applying the technical solution of the present invention, the refrigerant can be first introduced into the zigzag cooling channel 11, and the heat exchange time of the refrigerant for the motor winding 20 can be extended by the zigzag cooling channel 11, so as to achieve effective cooling of the motor winding 20. After that, the refrigerant flows into the left cooling chamber 12 to cool the components in the left cooling chamber 12, and finally flows into the right cooling chamber 13 through the flow passage 14 to cool the components in the right cooling chamber 13, thereby achieving sufficient cooling of the motor.

[0027] Compared with the previous spiral cooling channel, in the technical solution of the present invention, the zigzag cooling channel 11 does not completely occupy the space in the middle of the length direction of the shell 10, so that an additional flow channel 14 can be provided in the middle of the shell 10 to connect the left cooling chamber 12 and the right cooling chamber 13, so that the motor can be fully cooled through a refrigerant pipeline.

[0028] As another embodiment not shown in the figure, the zigzag cooling channel 11 can also be connected to the right cooling chamber 13, and then the right cooling chamber 13 and the left cooling chamber 12 can be connected through the flow passage 14.

[0029] Optionally, in the technical solution of this embodiment, the tortuous cooling channel 11 is an S-shaped cooling channel.

[0030] like Figure 4 and Figure 5 As shown, in the technical solution of this embodiment, the flow passage 14 is distributed between the two ends in the overall width direction of the zigzag cooling passage 11 in the housing 10. Preferably, in order to enable the zigzag cooling passage 11 to cool the motor winding 20 more fully, the distance between the two ends in the width direction of the zigzag cooling passage 11 and the flow passage 14 should be as small as possible.

[0031] like Figure 1 As shown, in the technical solution of this embodiment, a refrigerant inlet 15 connected to the zigzag cooling channel 11 is provided on the shell 10, and the refrigerant can be easily introduced into the zigzag cooling channel 11 through the refrigerant inlet 15. In the technical solution of this embodiment, the refrigerant inlet 15 is arranged at the top of the shell 10. According to needs, the refrigerant inlet 15 can also be arranged at any position in the circumferential direction that can communicate with the channel.

[0032] like Figure 5 As shown, optionally, in the technical solution of this embodiment, two air inlet openings 111 connected to the refrigerant inlet 15 are provided on the zigzag cooling channel 11. As other optional implementations, only one air inlet opening 111 connected to the refrigerant inlet 15 may be provided on the zigzag cooling channel 11, or more air inlet openings 111 connected to the refrigerant inlet 15 may be provided. The number of air inlet openings 111 may be reasonably increased according to the actual heating condition of the motor, and some openings may be controlled to be opened and some openings may be closed according to the actual condition.

[0033] Optionally, in the technical solution of this embodiment, the flow channel cross section of the zigzag cooling flow channel 11 is rectangular. As other optional implementations, the flow channel cross section of the zigzag cooling flow channel 11 can also be trapezoidal or arc-shaped.

[0034] It is necessary to explain that, in the technical solution of the present invention, the ratio of the width of the spacer between two adjacent channels of the zigzag cooling channel 11 to the channel width of the zigzag cooling channel 11 is 1:1 to 1:4. Preferably, the ratio of the width of the spacer between two adjacent channels of the zigzag cooling channel 11 to the channel width of the zigzag cooling channel 11 is 1:2, which can make the cooling effect of the zigzag cooling channel 11 better.

[0035] In the technical solution of this embodiment, each flow channel of the zigzag cooling flow channel 11 is perpendicular to the central axis of the housing 10. As another optional implementation, each flow channel of the zigzag cooling flow channel 11 and the central axis of the housing 10 may also be arranged at an angle.

[0036] The present invention also provides a compressor, which includes a motor cooling system and a compression end connected to the motor cooling system, wherein the motor cooling system is the motor cooling system described above. By using the motor cooling system described above, the cooling performance of the motor is better, and the compressor can run more stably.

[0037] like Figure 1 As shown, in the technical solution of this embodiment, the compressor is a two-stage compressor, and the compression end includes a primary compression end 30 and a secondary compression end 40, and the primary compression end 30 and the secondary compression end 40 are respectively connected to the two ends of the motor cooling system. More preferably, in the technical solution of this embodiment, the left cooling chamber 12 is connected to the tortuous cooling channel 11, and the right cooling chamber 13 is connected to the primary compression end 30. In this way, the cooled refrigerant can continue to flow to the primary rotor cavity of the primary compression end 30, which can effectively increase the exhaust volume of the compressor, increase the heating capacity when used as a heat pump, reduce the impact on the suction temperature, and will not generate additional refrigerant pressure loss.

[0038] As another optional implementation, another one of the right cooling chambers 13 may be connected to the secondary compression end 40, which can also effectively increase the exhaust volume of the compressor.

[0039] The present invention also provides an air conditioning unit, comprising the above compressor. The air conditioning unit using the above compressor can ensure the stability of the operation of the air conditioning unit due to its excellent cooling performance. In addition, in addition to the above implementation, the refrigerant after the cooling motor can be introduced into the system evaporator, which can increase the refrigerant flow entering the evaporator and improve the refrigeration capacity of the unit in the refrigeration condition.

[0040] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the embodiments of the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A compressor, comprising a motor cooling system and a compression end connected to the motor cooling system, characterized in that: The motor cooling system comprises a housing (10) and a motor winding (20) installed in the housing (10); a zigzag cooling channel (11) is formed in the middle of the housing (10) in the longitudinal direction; a left cooling cavity (12) and a right cooling cavity (13) are respectively formed at both ends of the housing (10) in the longitudinal direction; the zigzag cooling channel (11) is connected to one of the left cooling cavity (12) and the right cooling cavity (13); and a cooling channel (12) is formed in the housing (10) to connect the left cooling cavity (12) and the right cooling cavity (13). ) of the flow passage (14); the compressor is a two-stage compressor, the compression end comprises a first compression end (30) and a second compression end (40), the first compression end (30) and the second compression end (40) are respectively connected to two ends of the motor cooling system; one of the left cooling chamber (12) and the right cooling chamber (13) is connected to the zigzag cooling passage (11), and the other of the left cooling chamber (12) and the right cooling chamber (13) is connected to one of the first compression end (30) and the second compression end (40).

2. The compressor according to claim 1, characterized in that The flow passage (14) is distributed in the shell (10) between two ends of the zigzag cooling passage (11) in the overall width direction.

3. The compressor according to claim 1, characterized in that The zigzag cooling channel (11) is an S-shaped cooling channel.

4. The compressor according to claim 1, characterized in that The shell (10) is provided with a refrigerant inlet (15) which is connected to the zigzag cooling channel (11).

5. The compressor according to claim 4, characterized in that The zigzag cooling channel (11) is provided with at least one air inlet opening (111) which is connected to the refrigerant inlet (15).

6. The compressor according to claim 1, characterized in that The flow channel cross section of the zigzag cooling flow channel (11) is rectangular, trapezoidal or circular.

7. The compressor according to claim 1, characterized in that The ratio of the width of the spacing strip between two adjacent flow channels of the zigzag cooling flow channel (11) to the flow channel width of the zigzag cooling flow channel (11) is 1:1-1:

4.

8. The compressor according to claim 1, characterized in that Each flow channel of the zigzag cooling flow channel (11) is arranged at an angle to the central axis of the shell (10).

9. An air conditioning unit, comprising a compressor, characterized in that: The compressor is the compressor according to any one of claims 1 to 8.

Images