Efficient permanent magnet synchronous frequency conversion screw compressor

Abstract

The efficient permanent magnet synchronous frequency conversion screw compressor comprises a compressor shell, a permanent magnet motor is fixed to one end of the compressor shell, a compression cavity is formed in the compressor shell, a female screw and a male screw which are in meshing transmission with each other are rotationally installed in the compression cavity, and a rotor of the permanent magnet motor drives the male screw; an air filtering bin is arranged at the top end of the compressor shell, an air inlet channel communicated with the compression cavity is arranged at the bottom of the air filtering bin, a filter element is arranged in the air filtering bin, an annular piece is fixed to the bottom end of the filter element, one side of the air filtering bin is communicated with an air inlet, and an air outlet is formed in the side, close to the end of the compressor shell, of the compressor shell. An oil outlet communicated with the annular oil cavity is formed in the top end of a shell of the permanent magnet motor, and an oil inlet is formed in the bottom end of the shell of the permanent magnet motor. Air does not pass through the motor cavity, the service life of the motor is long, the compression cavity and the permanent magnet motor inner cavity are independently separated, the influence of motor heating on air is reduced, and the air suction volume efficiency of the compressor is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of screw compressors, and particularly relates to a high-efficiency permanent magnet synchronous variable frequency screw compressor. Background Art

[0002] Screw compressors, also known as spiral compressors, include screw air compressors and screw process compressors (such as vinyl chloride compressors). Screw machines are volumetric twin-screw oil-injected compressors, generally of box-type skid-mounted structure. Screw compressors are divided into single-screw compressors and twin-screw compressors. Inside the twin-screw compressor, there are a female rotor and a male rotor that are engaged and driven.

[0003] In traditional screw compressors, the inhaled air enters the chamber where the motor is located. The air enters the chamber and directly contacts the motor, affecting the service life of the motor. Secondly, the motor and the compression chamber are in the same chamber, and the heat generated by the motor will cause the inhaled air to expand, reducing the suction volumetric efficiency of the compressor. Summary of the Invention

[0004] The purpose of this application is to provide a high-efficiency permanent magnet synchronous variable frequency screw compressor to solve the problems raised in the above background art.

[0005] To achieve the above purpose, this application provides the following technical solution: A high-efficiency permanent magnet synchronous variable frequency screw compressor includes a compressor housing. One end of the compressor housing is fixedly installed with a permanent magnet motor. Inside the compressor housing, there is a compression chamber. The compression chamber is independently separated from the inner cavity of the permanent magnet motor. Inside the compression chamber, a female screw and a male screw that are meshed and driven are rotatably installed. The rotor of the permanent magnet motor drives the male screw. At the top of the compressor housing, there is a filter chamber. At the bottom of the filter chamber, there is an intake passage with a check valve that communicates with the compression chamber. Inside the filter chamber, there is a filter element. At the bottom end of the filter element, there is a fixedly installed annular part. At the top of the annular part, there is an annular groove. One side of the filter chamber communicates with an air inlet. On one side of the compressor housing near its end, there is an air outlet that communicates with its interior. Between the outer shell and the stator of the permanent magnet motor, there is an annular oil chamber. At the top of the housing of the permanent magnet motor, there is an oil outlet that communicates with the annular oil chamber. At the bottom end of the housing of the permanent magnet motor, there is an oil inlet that communicates with the annular oil chamber. On one side of the housing of the permanent magnet motor, there is a refrigerant inlet that communicates with the chamber where the rotor is located inside. At one end of the permanent magnet motor, there is a refrigerant outlet that communicates with the chamber where the rotor is located inside. Outside the compressor housing, there is a first pipeline fixedly installed. On the first pipeline, there is a solenoid valve fixedly installed. The two ends of the first pipeline respectively communicate with the high-pressure area and the low-pressure area of the compression chamber.

[0006] Preferably, at the bottom of the inner cavity of the filter chamber, there is a spring that contacts the bottom of the filter element. At the top of the filter chamber, there is a detachable lid.

[0007] Preferably, a second pipeline is fixedly installed on the outer side of the compressor housing. Both ends of the second pipeline communicate with the low-pressure area of the compression chamber, and a safety valve is fixedly installed on the second pipeline.

[0008] Preferably, an oil replenishing port communicating with the internal compression chamber is provided on one side of the bottom end of the compressor housing.

[0009] Preferably, an economic air inlet communicating with the internal compression chamber is provided at the bottom end of the compressor housing.

[0010] Preferably, a one-way valve is arranged inside the air outlet.

[0011] In summary, the technical effects and advantages of the present invention are as follows:

[0012] In the present invention, the traditional ordinary motor is replaced with the permanent magnet motor of the present invention. The permanent magnet motor drives the male rotor to rotate. The compression chamber in the compressor is independently separated from the inner cavity of the permanent magnet motor. Air does not pass through the motor cavity, and impurities in the air will not adsorb on the permanent magnet motor. The motor has a long service life. The motor is provided with an independent heat dissipation channel, which reduces the influence of motor heating on the gas and improves the suction volumetric efficiency of the compressor. Secondly, the present invention is provided with a filter element to filter out most of the impurities and dust in the air. The annular part with a ring groove designed at the bottom can hold the fallen dust and impurities when the filter element is pulled out, preventing dust from entering the internal compression chamber and ensuring the efficient operation of the compressor. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the following drawings are only some embodiments of the present application. For those skilled in the art, other drawings can be obtained based on these drawings without creative efforts.

[0014] Figure 1 It is a first three-dimensional structure schematic diagram of a high-efficiency permanent magnet synchronous variable frequency screw compressor in an embodiment of the present application; Figure 2 It is a second three-dimensional structure schematic diagram of a high-efficiency permanent magnet synchronous variable frequency screw compressor in an embodiment of the present application; Figure 3 It is a first cross-sectional structure schematic diagram of a high-efficiency permanent magnet synchronous variable frequency screw compressor in an embodiment of the present application; Figure 4 It is a second cross-sectional structure schematic diagram of a high-efficiency permanent magnet synchronous variable frequency screw compressor in an embodiment of the present application; Figure 5 It is a high-efficiency permanent magnet synchronous variable frequency screw compressor in an embodiment of the present application Figure 3 An enlarged structure schematic diagram at position A. In the figure: 1, permanent magnet motor; 2, compressor housing; 3, air filter chamber; 4, air inlet; 5, filter element; 6, air inlet channel;

[0015] 7. Compression chamber; 8. Male screw; 9. Female screw; 10. Oil outlet; 11. Oil inlet; 12. Annular oil chamber; 13. First pipeline; 14. Solenoid valve; 15. Second pipeline; 16. Safety valve; 17. Cover; 18. Refrigerant inlet; 19. Refrigerant outlet; 20. Annular part; 21. Annular groove; 22. Spring; 23. Oil replenishing port; 24. Economical air intake port; 25. Air outlet. Detailed implementation mode

[0016] 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 based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0017] In the description of the present disclosure, it should be noted that the orientation or positional relationship indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", "top", "bottom", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present disclosure and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus cannot be understood as a limitation to the present disclosure. In addition, the terms "first", "second", and "third" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance.

[0018] It should also be noted that the standard parts used in this application document can all be purchased from the market, and can also be customized according to the description in the specification and the drawings. Unless otherwise clearly specified and limited, the terms "installation", "connection", and "connection" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected, or indirectly connected through an intermediate medium, and can be the internal communication of two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present disclosure can be understood according to specific situations. And without clear limitations, the machinery, parts and equipment can all adopt the conventional models in the prior art.

[0019] In this text, the term "comprising" is intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a series of elements includes not only those elements but also other elements not expressly listed, or elements that are inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the statement "comprising..." does not preclude the presence of additional identical elements in the process, method, article, or apparatus that comprises the said element.

[0020] Example: Refer to Figures 1-5 An efficient permanent magnet synchronous variable frequency screw compressor as shown, which comprises a compressor housing 2. One end of the compressor housing 2 is fixedly installed with a permanent magnet motor 1. A compression chamber 7 is provided inside the compressor housing 2. The compression chamber 7 is independently separated from the inner cavity of the permanent magnet motor 1, so that the heat transferred from the motor chamber to the compression chamber is greatly reduced, impurities in the air will not adsorb on the permanent magnet motor, and the motor has a long service life. An internal screw 9 and an external screw 8 that mesh and drive each other are rotatably installed in the compression chamber 7. The rotor of the permanent magnet motor 1 drives the external screw 8. A filter chamber 3 is provided at the top of the compressor housing 2. The bottom of the filter chamber 3 is provided with an intake passage 6 with a one-way valve that communicates with the compression chamber 7. The one-way valve is provided here to prevent the screw from reversing. A filter element 5 is provided inside the filter chamber 3. The bottom end of the filter element 5 is fixedly installed with an annular member 20. An annular groove 21 is provided at the top of the annular member 20. An air inlet 4 is communicated with one side of the filter chamber 3. An air outlet 25 that communicates with the inside is provided on one side of the compressor housing 2 near its end. The permanent magnet motor drives the external screw to rotate, the external screw drives the internal screw to rotate, and the internal screw and the external screw cooperate to compress the inhaled air. The compressed air is discharged from the air outlet. The air enters the filter chamber from the air inlet, and after being filtered, enters the compression chamber. The filter element can filter out most of the impurities and dust in the air. The annular member with an annular groove at the bottom can hold the falling dust and impurities when the filter element is pulled out, preventing the dust from entering the inside of the compression chamber and ensuring the efficient operation of the compressor. Among them, the stator and rotor of the permanent magnet motor are centered and on the axis. First, install the stator. Since it is a permanent magnet motor and the rotor has magnetic force, it will be slowly sucked in during installation. Compared with a common motor, it is easier to be in the same plane.

[0021] There is an annular oil chamber 12 between the outer shell and the stator of the permanent magnet motor 1. An oil outlet 10 communicating with the annular oil chamber 12 is provided at the top end of the motor housing of the permanent magnet motor 1, and an oil inlet 11 communicating with the annular oil chamber 12 is provided at the bottom end of the motor housing of the permanent magnet motor 1. This is the first cooling method, which cools the permanent magnet motor by heat exchange with the oil. A refrigerant inlet 18 communicating with the chamber where the internal rotor is located is provided on one side of the motor housing of the permanent magnet motor 1, and a refrigerant outlet 19 communicating with the chamber where the internal rotor is located is provided at one end of the permanent magnet motor 1. This is the second heat dissipation method. The refrigerant directly contacts the stator and the rotor, and the refrigeration effect is better, but it is not economical enough and is prone to leaving impurities. Therefore, it is used when it is overheated and the oil cooling cannot handle it. The motor is provided with an independent heat dissipation channel, which reduces the influence of the motor heat generation on the gas and improves the suction volume efficiency of the compressor.

[0022] A first pipeline 13 is fixedly installed on the outside of the compressor housing 2. A solenoid valve 14 is fixedly installed on the first pipeline 13. The two ends of the first pipeline 13 are respectively communicated with the high-pressure area and the low-pressure area of the compression chamber 7. The first pipeline controls the air pressure balance between the high-pressure area and the low-pressure area. The solenoid valve is opened when the compressor starts, and the compressor can start working more smoothly after maintaining the balance. The solenoid valve is closed when the compressor is working.

[0023] With the above structure: A spring 22 contacting the bottom of the filter element is provided at the bottom of the inner cavity of the air filter chamber 3. A detachable cover 17 is provided at the top end of the air filter chamber 3. The spring applies pressure to the filter element to ensure the stable installation of the filter element and avoid shaking. The filter element can be taken out by opening the cover.

[0024] With the above structure: A second pipeline 15 is fixedly installed on the outside of the compressor housing 2. Both ends of the second pipeline 15 are communicated with the low-pressure area of the compression chamber. A safety valve 16 is fixedly installed on the second pipeline 15. The safety valve is opened when the compressor fails to balance the pressure with the low-pressure area.

[0025] With the above structure: An oil replenishment port 23 communicating with the internal compression chamber 7 is provided on one side at the bottom end of the compressor housing 2. The design of the oil replenishment port is to inject oil to lubricate the screw, seal the gap to prevent gas leakage, and at the same time take away heat to play a role in cooling.

[0026] With the above structure: An economic air inlet 24 communicating with the internal compression chamber 7 is provided at the bottom end of the compressor housing 2, which supplements air when the compressor works at low temperature.

[0027] With the above structure: A one-way valve is built in the air outlet 25 to prevent oil from leaking out.

[0028] Finally, it should be noted that the above are only the preferred embodiments of the present invention and are not used to limit the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions recorded in the foregoing embodiments or perform equivalent replacements for some of the technical features. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims

1. An efficient permanent magnet synchronous variable frequency screw compressor, comprising a compressor housing (2), characterized in that: One end of the compressor housing (2) is fixedly installed with a permanent magnet motor (1). Inside the compressor housing (2), there is a compression chamber (7), which is independently separated from the inner cavity of the permanent magnet motor (1). Inside the compression chamber (7), a female screw rod (9) and a male screw rod (8) that mesh and drive each other are rotatably installed. The rotor of the permanent magnet motor (1) drives the male screw rod (8). At the top of the compressor housing (2), there is a filter chamber (3). At the bottom of the filter chamber (3), there is an intake passage (6) with a one-way valve that communicates with the compression chamber (7). Inside the filter chamber (3), there is a filter element (5). At the bottom end of the filter element (5), there is a fixedly installed annular part (20). At the top of the annular part (20), there is an annular groove (21). One side of the filter chamber (3) communicates with an air inlet (4). On one side of the compressor housing (2) near its end, there is an air outlet (25) that communicates with its interior. Between the outer shell and the stator of the permanent magnet motor (1), there is an annular oil chamber (12). At the top of the housing of the permanent magnet motor (1), there is an oil outlet (10) that communicates with the annular oil chamber (12). At the bottom end of the housing of the permanent magnet motor (1), there is an oil inlet (11) that communicates with the annular oil chamber (12). On one side of the housing of the permanent magnet motor (1), there is a refrigerant inlet (18) that communicates with the chamber where the rotor is located inside. At one end of the permanent magnet motor (1), there is a refrigerant outlet (19) that communicates with the chamber where the rotor is located inside. Outside the compressor housing (2), there is a fixedly installed first pipeline (13). On the first pipeline (13), there is a solenoid valve (14) fixedly installed. The two ends of the first pipeline (13) respectively communicate with the high-pressure area and the low-pressure area of the compression chamber (7).

2. The high-efficiency permanent magnet synchronous variable frequency screw compressor according to claim 1, wherein: At the bottom of the inner cavity of the filter chamber (3), there is a spring (22) that contacts the bottom of the filter element. At the top of the filter chamber (3), there is a detachable cover (17).

3. An efficient permanent magnet synchronous variable frequency screw compressor according to claim 1, characterized in that: Outside the compressor housing (2), there is a fixedly installed second pipeline (15). Both ends of the second pipeline (15) communicate with the low-pressure area of the compression chamber. On the second pipeline (15), there is a safety valve (16) fixedly installed.

4. An efficient permanent magnet synchronous variable frequency screw compressor according to claim 1, characterized in that: On one side at the bottom end of the compressor housing (2), there is a oil replenishment port (23) that communicates with the internal compression chamber (7).

5. An efficient permanent magnet synchronous variable frequency screw compressor according to claim 1, characterized in that: At the bottom end of the compressor housing (2), there is an economic air inlet (24) that communicates with the internal compression chamber (7).

6. An efficient permanent magnet synchronous variable frequency screw compressor according to claim 1, characterized in that: The air outlet (25) is internally provided with a one-way valve.

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