Compressor and air conditioning unit

Abstract

The application provides a compressor and an air conditioning unit. The compressor comprises a shell, a primary suction port and an exhaust port are arranged on the shell, a cooling flow channel is arranged at the exhaust port, and the inflow port and the outflow port of the cooling flow channel are communicated with the primary suction port. The compressor and the air conditioning unit provided by the application can use low-temperature refrigerant gas to reduce the temperature of high-temperature refrigerant of a secondary suction port, and the compressor has the problem of liquid suction. The refrigerant after absorbing the temperature of the high-temperature refrigerant is returned to the primary suction port, the liquid refrigerant at the primary suction port can be heated, the problem of liquid suction of the compressor is avoided, the liquid refrigerant can also reduce the temperature of the high-temperature refrigerant returned to the primary suction port from the cooling flow channel, the temperature rise of the refrigerant is reduced, the adiabatic efficiency of the centrifugal compressor is further improved, and the performance of the centrifugal compressor is improved.

Description

Technical Field

[0001] This invention relates to the field of compression equipment technology, and in particular to a compressor and air conditioning unit. Background Technology

[0002] To reduce compressor power consumption and improve cooling capacity, multi-stage compression refrigeration cycles have been proposed. Currently, the most widely used type is the two-stage compressor, which uses two impellers to compress the refrigerant. The first-stage impeller performs primary compression, and the refrigerant is then sent to the second-stage impeller for secondary compression, thus ensuring the compressor's compression capacity. While the compression of the refrigerant gas through rotational work increases its pressure, this process inevitably raises the gas temperature. Furthermore, due to frictional losses, turbulence losses, and other factors, it is difficult for the temperature to reach isentropic levels, significantly reducing the compression performance of the centrifugal compressor. Summary of the Invention

[0003] In order to solve the technical problem of low compression performance of compressors in the prior art, a compressor and air conditioning unit are provided that have a cooling channel to cool the high-temperature gas at the secondary suction port to improve the compressor's thermal efficiency and compression performance.

[0004] A compressor, comprising:

[0005] The housing is provided with a primary air intake port and an air exhaust port;

[0006] A cooling channel is provided at the exhaust port, and the inlet and outlet of the cooling channel are both connected to the primary intake port.

[0007] The compressor further includes a secondary diffuser. A secondary intake port is provided on the housing. The secondary diffuser is located at the secondary intake port, and the outlet of the secondary diffuser constitutes the exhaust port. The cooling channel is located on the secondary diffuser.

[0008] The secondary diffuser has a pressure-receiving side facing the secondary intake port and a back-pressure side facing away from the secondary intake port, and the cooling channel is disposed on the back-pressure side.

[0009] The inlet of the cooling channel is located at the center of the back pressure side, and the outlet of the cooling channel is located at the edge of the back pressure side.

[0010] The secondary diffuser has a first end and a second end opposite to each other. The first end is provided with an inlet of the cooling channel, and the inlet and the center of the back pressure side are provided with an inlet channel. The second end is provided with an outlet of the cooling channel.

[0011] The cooling channel includes multiple baffle channels, all of which are evenly distributed on the secondary diffuser and are connected in sequence.

[0012] The secondary diffuser is circular in shape, and the baffle channel is arc-shaped. The center of all the baffle channels coincides with the center of the circular shape of the secondary diffuser.

[0013] The two adjacent baffle channels are interconnected, and the fluid in the two adjacent baffle channels flows in opposite directions.

[0014] The compressor further includes a first-stage diffuser, which is located at the first-stage intake port. The inlet of the cooling channel is connected to the outlet of the first-stage diffuser, and the outlet of the cooling channel is connected to the inlet of the first-stage diffuser.

[0015] The compressor also includes a motor disposed within the housing. The primary intake port and the primary diffuser are located on the first side of the motor, and the secondary intake port and the secondary diffuser are located on the second side of the motor. A first circulation channel and a second circulation channel are provided on the portion of the housing corresponding to the motor. The inlet of the cooling channel is connected to the outlet of the primary diffuser through the first circulation channel, and the outlet of the cooling channel is connected to the inlet of the primary diffuser through the second circulation channel.

[0016] The cooling channel is equipped with a flow regulation mechanism.

[0017] An air conditioning unit includes the compressor described above.

[0018] The compressor and air conditioning unit provided by this invention, by setting up a cooling channel, delivers the low-temperature refrigerant gas from the primary suction port to the secondary suction port. The low-temperature refrigerant gas cools the high-temperature refrigerant at the secondary suction port, thereby effectively improving the insulation efficiency of the centrifugal compressor and enhancing its performance. Furthermore, since compressors often suffer from liquid carryover during suction, the refrigerant, after absorbing the temperature of the high-temperature refrigerant, flows back to the primary suction port, heating the liquid refrigerant there and converting it to a gaseous state. This avoids the liquid carryover problem and, simultaneously, cools the high-temperature refrigerant flowing back to the primary suction port through the cooling channel, reducing the refrigerant's temperature rise and further improving the insulation efficiency of the centrifugal compressor, thus enhancing its performance. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the compressor provided in an embodiment of the present invention;

[0020] Figure 2This is a schematic diagram of the cooling channel structure provided in an embodiment of the present invention;

[0021] Figure 3 A cross-sectional view of a two-stage diffuser provided in an embodiment of the present invention;

[0022] In the picture:

[0023] 1. Housing; 11. Primary intake port; 12. Secondary intake port; 13. Exhaust port; 30. Cooling channel; 2. Secondary diffuser; 31. Inlet; 32. Outlet; 33. Inlet channel; 34. Baffle channel; 4. Primary diffuser; 5. Motor; 35. First circulation channel; 36. Second circulation channel; 6. Flow regulation mechanism. Detailed Implementation

[0024] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are for illustrative purposes only and are not intended to limit the invention.

[0025] To enable those skilled in the art to better understand the present invention, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort should fall within the scope of protection of the present invention.

[0026] It should be noted that the terms "first," "second," etc., in the specification, claims, and accompanying drawings of this invention are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such terms can be used interchangeably where appropriate for the embodiments of the invention described herein. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover non-exclusive inclusion; for example, a process, method, system, product, or apparatus that comprises a series of steps or units is not necessarily limited to those steps or units explicitly listed, but may include other steps or units not explicitly listed or inherent to such processes, methods, products, or apparatus.

[0027] It should be noted that in the description of this invention, terms such as "upper," "lower," "left," "right," "inner," and "outer," indicating directional or positional relationships, are based on the directional or positional relationships shown in the accompanying drawings. These are merely for ease of description and do not indicate or imply that the device or element must have a specific orientation, or be constructed and operated in a specific orientation; therefore, they should not be construed as limitations on this invention. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0028] Furthermore, it should be noted that, in the description of this invention, unless otherwise explicitly specified and limited, the terms "installation," "setting," and "connection" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a direct connection, an indirect connection through an intermediate medium, or a connection within two components. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0029] Existing centrifugal two-stage compressors use a first-stage impeller to compress the refrigerant, which is then sent to a second-stage impeller for further compression, thus ensuring the compressor's compression capacity. However, while the compression of the refrigerant gas through rotational work increases its pressure, this process inevitably raises the gas temperature. Furthermore, due to frictional and turbulent losses, achieving isentropic compression is difficult, significantly reducing the centrifugal compressor's compression performance. Therefore, this application provides a... Figures 1 to 3 The compressor shown includes: a housing 1, on which a primary intake port 11 and an exhaust port 13 are provided; the inlet 31 and outlet 32 ​​of the cooling channel 30 are both connected to the primary intake port 11. By setting the cooling channel 30, the low-temperature refrigerant gas at the primary intake port 11 is transported to the secondary intake port, and the low-temperature refrigerant gas is used to cool the high-temperature refrigerant at the secondary intake port, thereby effectively improving the adiabatic efficiency of the centrifugal compressor and achieving the purpose of improving the performance of the centrifugal compressor. Moreover, the compressor has the problem of liquid carryover during intake. The refrigerant, after absorbing the temperature of the high-temperature refrigerant, flows back to the primary intake port 11, which can heat the liquid refrigerant at the primary intake port 11, turning the liquid refrigerant into a gaseous state, thus avoiding the problem of liquid carryover during compressor intake. It can also cool the high-temperature refrigerant flowing back to the primary intake port 11 through the cooling channel 30, thereby reducing the temperature rise of the refrigerant and further improving the adiabatic efficiency of the centrifugal compressor, achieving the purpose of improving the performance of the centrifugal compressor.

[0030] In one embodiment, the compressor further includes a secondary diffuser 2. A secondary intake port 12 is provided on the housing 1, and the secondary diffuser 2 is located at the secondary intake port 12. The outlet of the secondary diffuser 2 constitutes the exhaust port 13. The secondary impeller of the compressor is located between the secondary diffuser 2 and the secondary intake port 12. The refrigerant compressed by the primary impeller first flows through the secondary intake port 12 and then flows to the secondary impeller to be compressed again. Finally, it is discharged through the secondary diffuser 2. Therefore, by setting the cooling channel 30 on the secondary diffuser 2, the final exhaust of the compressor can be cooled, thereby improving the adiabatic efficiency of the centrifugal compressor and achieving the purpose of improving the performance of the centrifugal compressor.

[0031] To prevent refrigerant from flowing directly through the cooling channel 30 to the exhaust port 13, and to maximize the cooling of the refrigerant at the exhaust port 13, the secondary diffuser 2 has a pressure-receiving side facing the secondary intake port 12 and a back-pressure side facing away from the secondary intake port 12. The cooling channel 30 is located on the back-pressure side. The pressure-receiving side ensures that the refrigerant in the compressor can flow smoothly through the secondary intake port 12 to the exhaust port 13, ensuring reliable compressor operation. Simultaneously, by opening the cooling channel 30 on the back-pressure side, the heat exchange efficiency between the refrigerant within the cooling channel 30 and the high-temperature refrigerant at the exhaust port 13 can be maximized, thereby improving the cooling effect on the compressor exhaust and enhancing the adiabatic efficiency of the centrifugal compressor.

[0032] Because a secondary impeller is located at the center of the secondary diffuser 2, the temperature at the center of the secondary diffuser 2 is lower, while the temperature at the edge of the secondary diffuser 2 is higher. Therefore, the inlet of the cooling channel 30 is located at the center of the back pressure side, and the outlet 32 ​​of the cooling channel 30 is located at the edge of the back pressure side. The low-temperature refrigerant at the intake port first cools the center of the secondary diffuser 2, and then cools the edge of the secondary diffuser 2. This ensures that the refrigerant temperature in the cooling channel 30 is always lower than the corresponding refrigerant temperature in the secondary diffuser 2, guaranteeing the cooling effect on the refrigerant in the secondary diffuser 2. This avoids the situation where the high-temperature refrigerant at the edge is cooled first, resulting in the refrigerant temperature in the cooling channel 30 being higher than the temperature at the center of the secondary diffuser 2, thus preventing reliable cooling. This ensures the cooling effect of the cooling channel 30 and improves the compression performance of the compressor.

[0033] like Figure 2As shown, the secondary diffuser 2 has a first end and a second end. The first end has an inlet 31 for the cooling channel 30, and the inlet 31 and the center of the back pressure side form an inlet channel 33. The second end has an outlet 32 ​​for the cooling channel 30. The low-temperature refrigerant at the intake flows to the first end of the secondary diffuser 2, and then flows directly to the center of the secondary diffuser 2 through the inlet channel 33, before flowing towards the edge of the secondary diffuser 2, ensuring the cooling effect of the refrigerant within the cooling channel 30.

[0034] To further improve the heat exchange efficiency and distance between the refrigerant in the cooling channel 30 and the high-temperature refrigerant at the secondary diffuser 2, the cooling channel 30 includes multiple baffle channels 34. All baffle channels 34 are evenly distributed on the secondary diffuser 2 and are sequentially connected. The baffle channels 34 allow the refrigerant in the cooling channel 30 to pass through the back pressure side of the secondary diffuser 2 to the maximum extent, thereby improving the heat exchange efficiency with the high-temperature refrigerant at the secondary diffuser 2 and enhancing the adiabatic efficiency of the centrifugal compressor.

[0035] Specifically, the secondary diffuser 2 is circular in shape, and the baffle channel 34 is arc-shaped, with the center of all the baffle channels 34 coinciding with the center of the circular shape of the secondary diffuser 2. This allows for the maximum possible number and size of the baffle channels 34, further improving the heat exchange efficiency of the high-temperature refrigerant at the secondary diffuser 2 and enhancing the adiabatic efficiency of the centrifugal compressor.

[0036] Optionally, two adjacent baffle channels 34 are interconnected, and the fluid directions in the two adjacent baffle channels 34 are opposite. For example... Figure 2 As shown, the refrigerant flows in a swirling motion within the cooling channel 30, thereby increasing the flow distance of the refrigerant and improving its heat exchange efficiency. Simultaneously, the refrigerant can gradually flow towards the edge of the secondary diffuser 2 within the baffle channel 34, thereby gradually cooling the secondary diffuser 2 and gradually raising the refrigerant level within the cooling channel 30, ensuring the cooling effect of the refrigerant within the cooling channel 30.

[0037] like Figure 2 As shown, the baffle channel 34 is distributed on the back pressure side of the secondary diffuser 2 in a left-right symmetrical structure, which enables sufficient heat exchange on both sides of the secondary diffuser 2 and ensures uniform overall temperature inside the diffuser.

[0038] The compressor also includes a first-stage diffuser 4, which is located at the first-stage intake port 11. The inlet 31 of the cooling channel 30 is connected to the outlet of the first-stage diffuser 4, and the outlet 32 ​​of the cooling channel 30 is connected to the inlet of the first-stage diffuser 4. To ensure that the refrigerant at the intake port can flow smoothly into the cooling channel 30 and return to the intake port, the refrigerant is compressed in the first stage using a first-stage impeller and the first-stage diffuser 4. At this time, the refrigerant has a certain pressure. Since the outlet 32 ​​of the cooling channel 30 is connected to the inlet of the first-stage diffuser 4, the pressure at the inlet 31 of the cooling channel 30 is greater than the pressure at the outlet 32. The refrigerant can flow smoothly into the cooling channel 30 without additional power, realizing the self-circulation of the refrigerant inside the compressor and reducing the structural complexity and cost of the compressor. The gas temperature of the first-stage diffuser 4 is usually 5°C to 15°C lower than that of the second-stage diffuser 2, and this refrigerant gas has the full capacity to cool the gas in the second-stage diffuser 2. Furthermore, after passing through the cooling channel 30, the pressure of the refrigerant has decreased significantly due to frictional losses. Therefore, it needs to flow back to the intake port to re-enter the compressor's compression process, ensuring reliable refrigerant flow within the cooling channel 30 and reliable compressor operation.

[0039] The compressor also includes a motor 5, which is disposed within the housing 1. The primary suction port 11 and the primary diffuser 4 are located on the first side of the motor 5, and the secondary suction port 12 and the secondary diffuser 2 are located on the second side of the motor 5. A first circulation channel 35 and a second circulation channel 36 are provided on the portion of the housing 1 corresponding to the motor 5. The inlet 31 of the cooling channel 30 is connected to the outlet of the primary diffuser 4 through the first circulation channel 35, and the outlet 32 ​​of the cooling channel 30 is connected to the inlet of the primary diffuser 4 through the second circulation channel 36. The motor 5 can simultaneously drive the primary and secondary impellers to rotate, thereby realizing the compression of the refrigerant by the compressor. Moreover, since the first circulation channel 35 and the second circulation channel 36 are located at the motor 5, the refrigerant flowing into the first and second circulation channels 36 can also cool the motor 5, thereby further improving the operating reliability of the compressor.

[0040] like Figure 1As shown in the figure, the first circulation channel 35 is located above the motor 5, while the second circulation channel 36 is located below the motor 5. When the centrifugal compressor has a problem of liquid carryover during suction, the liquid refrigerant sucked in from the first-stage suction port 11 will accumulate below the casing 1 and at the inlet of the first-stage diffuser 4. The refrigerant flowing in the second circulation channel 36 exchanges heat with the high-temperature refrigerant at the exhaust port 13. Its temperature is higher than that at the suction port and higher than that of the liquid refrigerant. Therefore, the liquid refrigerant can directly exchange heat with the refrigerant flowing in the second circulation channel 36. The liquid refrigerant, along with the gaseous refrigerant returning in the second circulation channel 36, enters the first-stage impeller and the first-stage diffuser 4 simultaneously for compression, ensuring the reliable operation and compression efficiency of the compressor.

[0041] A flow regulation mechanism 6 is provided on the cooling channel 30. The flow regulation mechanism 6 is used to adjust the amount of refrigerant flowing into the cooling channel 30, thereby enabling the compressor to be used under different conditions and improving the compressor's applicability range.

[0042] An air conditioning unit includes the compressor described above.

[0043] The embodiments described above are merely illustrative of several implementations of the present invention, and while the descriptions are specific and detailed, they should not be construed as limiting the scope of the present invention. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of the present invention, and these modifications and improvements all fall within the scope of protection of the present invention. Therefore, the scope of protection of this patent should be determined by the appended claims.

Claims

1. A compressor, characterized in that: include: The housing (1) is provided with a primary air intake (11) and an exhaust port (13). A cooling channel is provided at the exhaust port (13), and the inlet (31) and outlet (32) of the cooling channel (30) are both connected to the first-stage intake port (11). The compressor also includes a secondary diffuser (2), a secondary intake port (12) is provided on the housing (1), the secondary diffuser (2) is provided at the secondary intake port (12), and the outlet of the secondary diffuser (2) constitutes the exhaust port (13), and the cooling channel (30) is provided on the secondary diffuser (2); The secondary diffuser (2) has a pressure side facing the secondary intake port (12) and a back pressure side away from the secondary intake port (12), and the cooling channel (30) is disposed on the back pressure side.

2. The compressor according to claim 1, characterized in that: The inlet (31) of the cooling channel (30) is located at the center of the back pressure side, and the outlet (32) of the cooling channel (30) is located at the edge of the back pressure side.

3. The compressor according to claim 2, characterized in that: The secondary diffuser (2) has a first end and a second end opposite to each other. The first end is provided with an inlet (31) of the cooling channel (30), and the inlet (31) and the center of the back pressure side have an inlet channel (33). The second end is provided with an outlet (32) of the cooling channel (30).

4. The compressor according to claim 1, characterized in that: The cooling channel (30) includes multiple baffle channels (34), all of which are evenly distributed on the secondary diffuser (2) and are connected in sequence.

5. The compressor according to claim 4, characterized in that: The secondary diffuser (2) is circular in shape, and the baffle channel (34) is arc-shaped. The center of all the baffle channels (34) is the same as the center of the circle of the secondary diffuser (2).

6. The compressor according to claim 5, characterized in that: The two adjacent flow channels (34) are interconnected, and the fluid in the two adjacent flow channels (34) is in opposite directions.

7. The compressor according to claim 1, characterized in that: The compressor also includes a first-stage diffuser (4), which is located at the first-stage intake port (11). The inlet (31) of the cooling channel (30) is connected to the outlet of the first-stage diffuser (4), and the outlet (32) of the cooling channel (30) is connected to the inlet of the first-stage diffuser (4).

8. The compressor according to claim 7, characterized in that: The compressor also includes a motor (5), which is disposed inside the housing (1). The first-stage suction port (11) and the first-stage diffuser (4) are located on the first side of the motor (5), and the second-stage suction port (12) and the second-stage diffuser (2) are located on the second side of the motor (5). A first circulation channel (35) and a second circulation channel (36) are provided on the part of the housing (1) corresponding to the motor (5). The inlet (31) of the cooling channel (30) is connected to the outlet of the first-stage diffuser (4) through the first circulation channel (35), and the outlet (32) of the cooling channel (30) is connected to the inlet of the first-stage diffuser (4) through the second circulation channel (36).

9. The compressor according to claim 1, characterized in that: The cooling channel (30) is provided with a flow regulation mechanism (6).

10. An air conditioning unit, characterized in that: The compressor includes any one of claims 1 to 9.

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