Oil supply mechanism of screw compressor

Abstract

The utility model discloses an oil supply mechanism of a screw compressor, which relates to the technical field of oil supply of screw compressors, and comprises a shell, a screw compressor body and an oil pump body, the screw compressor body is arranged in the shell, the screw compressor body comprises a machine body, a motor, a male rotor, a female rotor and an oil groove, and the motor drives a tail end shaft of the male rotor. An oil pump body is arranged in the shell on one side of the screw compressor body, the driving shaft end of the oil pump body is connected with the tail end shaft of the male rotor through a key, and an oil inlet channel and an oil outlet channel are formed in the shell wall of the shell; the oil pump body and the screw compressor body are both arranged in the shell, the motor is arranged to drive the tail end shaft of the male rotor, the driving shaft end of the oil pump body is connected with the tail end shaft of the male rotor through the key, when the tail end shaft of the male rotor rotates, the driving shaft end of the oil pump body synchronously rotates, and the oil pump body does not need to be independently powered; the oil supply efficiency can be greatly improved; and the reliability is high.

Description

Technical Field

[0001] This utility model relates to the field of oil supply technology for screw compressors, and in particular to an oil supply mechanism for a screw compressor. Background Technology

[0002] Oil-injected screw compressors typically use the pressure difference between exhaust and intake air to provide the power for oil supply. This method of oil supply is simple in structure and easy to implement.

[0003] When relying on differential pressure for oil supply in a compressor system, the reliability of oil supply is affected when the system differential pressure is too small. Under such conditions, the bearings cannot receive adequate oil, the compressor cannot operate, and its operating range is narrow. Therefore, conventional differential pressure oil supply for screw compressors has certain limitations in application. In open-type screw compressors, existing technologies generally use external oil pumps to supply oil. However, external oil pumps often suffer from leakage problems and are expensive. Therefore, this invention proposes an oil supply mechanism for screw compressors to address the shortcomings of existing technologies. Utility Model Content

[0004] To address the aforementioned problems, the purpose of this utility model is to provide an oil supply mechanism for a screw compressor. By housing both the oil pump body and the screw compressor body within a casing, and providing a motor-driven tail shaft for the male rotor, the drive shaft of the oil pump body and the tail shaft of the male rotor are connected by a key. When the tail shaft of the male rotor rotates, the drive shaft of the oil pump body rotates synchronously, eliminating the need for a separate power supply to the oil pump body, thus greatly improving oil supply efficiency and reliability.

[0005] To achieve the above objectives, this utility model provides the following technical solution:

[0006] An oil supply mechanism for a screw compressor includes a housing, a screw compressor body, and an oil pump body. The screw compressor body is housed inside the housing. The screw compressor body includes a casing, a motor, a male rotor, a female rotor, and an oil trough. The male and female rotors are arranged side by side and are rotatably mounted to the casing via bearings. The male and female rotors cooperate with each other. The motor drives the tail shaft of the male rotor. An oil pump body is housed inside the housing on one side of the screw compressor body. The drive shaft of the oil pump body is connected to the tail shaft of the male rotor via a key. The housing wall has an oil inlet passage and an oil outlet passage. The oil trough, the oil inlet passage, the oil outlet passage, and the oil pump body together form an oil supply path.

[0007] A further improvement is that: an oil outlet is provided at the bottom of one end of the oil tank, one end of the oil inlet passage is connected to the oil outlet, and the other end of the oil inlet passage is connected to the oil input port of the oil pump body.

[0008] A further improvement is that: one end of the oil outlet passage is connected to the oil output port of the oil pump body, the male rotor and female rotor form a rotor cavity with the machine body, and the outer shell of the rotor cavity is provided with a first oil suction port, which is connected to the rotor cavity and the oil outlet passage respectively.

[0009] A further improvement is that a clamping nut is provided on the tail end shaft of the male rotor, and the clamping nut is connected to the motor housing.

[0010] A further improvement is that: a second oil suction port is provided on the outer casing of the bearing, the second oil suction port is connected to the oil outlet channel, and the chamber at the bearing mounting position is connected to the oil groove.

[0011] A further improvement is that: the inner wall of the housing near the oil pump body is provided with symmetrical fixing holes, and the oil pump body is connected to the fixing holes by fixing bolts.

[0012] The beneficial effects of this utility model are as follows: By setting both the oil pump body and the screw compressor body inside the outer casing, and setting a motor to drive the tail shaft of the male rotor, the drive shaft end of the oil pump body and the tail shaft end of the male rotor are connected by a key. When the tail shaft end of the male rotor rotates, the drive shaft end of the oil pump body rotates synchronously. It is not necessary to supply power to the oil pump body separately, which can greatly improve the oil supply efficiency and reliability. The oil pump body is set inside the outer casing, so even if there is a small amount of internal leakage, it will not affect the reliability of the compressor. Compared with external oil pump technology, it can greatly reduce costs. Attached Figure Description

[0013] Figure 1 This is a schematic diagram of the main structure of this utility model;

[0014] Figure 2 This is a front view schematic diagram of the oil pump body installation structure of this utility model.

[0015] The components are as follows: 1. Outer casing; 2. Oil pump body; 201. Drive shaft end; 202. Oil inlet port; 203. Oil outlet port; 3. Machine body; 4. Motor; 5. Male rotor; 501. Tail end shaft; 6. Female rotor; 7. Oil groove; 8. Key; 9. Oil inlet passage; 10. Oil outlet passage; 11. Oil outlet port; 12. First suction port; 13. Compression nut; 14. Second suction port; 15. Fixing bolt. Detailed Implementation

[0016] To deepen the understanding of this utility model, the following detailed description will be provided in conjunction with embodiments. These embodiments are only used to explain this utility model and do not constitute a limitation on the scope of protection of this utility model.

[0017] according to Figure 1-2As shown, this embodiment proposes an oil supply mechanism for a screw compressor, including a housing 1, a screw compressor body, and an oil pump body 2. The screw compressor body is housed inside the housing 1. The screw compressor body includes a casing 3, a motor 4, a male rotor 5, a female rotor 6, and an oil tank 7. The motor 4, male rotor 5, female rotor 6, and oil tank 7 are housed inside the casing 3. The male rotor 5 and female rotor 6 are arranged side by side and are rotatably mounted inside the casing 3 via bearings. The male rotor 5 and female rotor 6 cooperate with each other. The motor 4 drives the tail shaft 501 of the male rotor 5. The oil pump body 2 is housed inside the housing 1 on one side of the screw compressor body. The drive shaft end 201 of the oil pump body 2 is connected to the tail shaft 501 of the male rotor 5 via a key 8. The casing wall of the housing 1 has an oil inlet passage 9 and an oil outlet passage 10. The oil tank 7, the oil inlet passage 9, the oil outlet passage 10, and the oil pump body 2 together form an oil supply path.

[0018] When the oil supply mechanism of this utility model is running, the tail shaft 501 of the male rotor 5 is connected to the drive shaft end 201 of the oil pump body 2 by key 8. After the motor 4 starts, it will drive the male rotor 5 and the drive shaft end 201 of the oil pump body 2 to rotate together. In this way, the male rotor 5 drives the female rotor 6 to perform gas compression. The rotation of the oil pump body 2 provides the oil supply power for the oil system. After the compressor draws in gas through the motor 4, the compressor works in the sealed space formed between the screws of the male rotor 5 and the female rotor 6 and the inner wall of the compression chamber of the machine body 3. The male rotor 5 and the female rotor 6 compress the gas to form high-pressure gas. The high-pressure gas is connected to the bottom oil tank 7. Then the oil in the oil tank 7 circulates through the oil supply passage formed by the oil tank 7, the oil inlet passage 9, the oil outlet passage 10 and the oil pump body 2. During the circulation process, the required lubricating oil is provided to the bearings and rotor cavity of the compressor.

[0019] The oil tank 7 has an oil outlet 11 at one end of its bottom. One end of the oil inlet channel 9 is connected to the oil outlet 11, and the other end of the oil inlet channel 9 is connected to the oil input port 202 of the oil pump body 2. The oil outlet channel 10 is connected to the oil output port 203 of the oil pump body 2. The male rotor 5 and female rotor 6 form a rotor cavity with the machine body 3. The outer shell 1 at the rotor cavity is provided with a first oil suction port 12, which is connected to both the rotor cavity and the oil outlet channel 10. The oil inlet 9 is connected to the oil tank 7. The oil in the oil tank 7 can be drawn away by the oil pump body 2. The oil outlet 203 of the oil pump body 2 supplies oil to the compressor bearings through the oil outlet 10, providing the required lubricating oil to the compressor bearings and rotor cavity. The lubricating oil that lubricates the bearings and enters the rotor cavity eventually returns to the oil tank 7 with the compressed gas. The oil in the oil tank 7 is then drawn away by the oil pump body 2 and used for the lubrication of the compressor. This cycle achieves a stable oil supply.

[0020] A clamping nut 13 is provided on the tail end shaft 501 of the male rotor 5, and the clamping nut 13 is connected to the housing of the motor 4. By setting the clamping nut 13, the stability is high when the drive shaft end 201 of the oil pump body 2 is connected to the tail end shaft 501 of the male rotor 5 and rotates synchronously.

[0021] The outer casing 1 of the bearing is provided with a second oil suction port 14, which is connected to the oil outlet 10. The chamber at the bearing installation position is connected to the oil trough 7.

[0022] The inner wall of the outer casing 1, near the oil pump body 2, is provided with symmetrical fixing holes, and the oil pump body 2 is connected to the fixing holes by fixing bolts 15.

[0023] This invention houses both the oil pump body and the screw compressor body within the outer casing 1, and includes a motor 4 driving the tail shaft 501 of the male rotor 5. The drive shaft end 201 of the oil pump body 2 is connected to the tail shaft 501 of the male rotor 5 via a key 8. When the tail shaft 501 of the male rotor 5 rotates, the drive shaft end 201 of the oil pump body 2 rotates synchronously, eliminating the need for a separate power supply to the oil pump body 2. This significantly improves oil supply efficiency and reliability. Since the oil pump body 2 is located inside the outer casing 1, even a small amount of internal leakage will not affect the reliability of the compressor. Compared to external oil pump technology, this invention can greatly reduce costs.

[0024] The foregoing has shown and described the basic principles, main features, and advantages of this utility model. Those skilled in the art should understand that this utility model is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of this utility model. Various changes and modifications can be made to this utility model without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claimed utility model. The scope of protection of this utility model is defined by the appended claims and their equivalents.

Claims

1. An oil supply mechanism for a screw compressor, characterized in that: The system includes a housing (1), a screw compressor body, and an oil pump body (2). The screw compressor body is located inside the housing (1). The screw compressor body includes a casing (3), a motor (4), a male rotor (5), a female rotor (6), and an oil tank (7). The motor (4), male rotor (5), female rotor (6), and oil tank (7) are located inside the casing (3). The male rotor (5) and female rotor (6) are arranged side by side. Both the male rotor (5) and female rotor (6) are rotatably mounted inside the casing (3) via bearings. The screw compressor body (7) and the female rotor (6) cooperate with each other. The motor (4) drives the tail shaft (501) of the male rotor (5). The casing (1) on one side of the screw compressor body is equipped with an oil pump body (2). The drive shaft end (201) of the oil pump body (2) is connected to the tail shaft (501) of the male rotor (5) by a key (8). The casing wall of the casing (1) is equipped with an oil inlet channel (9) and an oil outlet channel (10). The oil tank (7), the oil inlet channel (9), the oil outlet channel (10) and the oil pump body (2) form an oil supply passage.

2. The oil supply mechanism of a screw compressor according to claim 1, characterized in that: The oil tank (7) has an oil outlet (11) at one end of its bottom. One end of the oil inlet channel (9) is connected to the oil outlet (11), and the other end of the oil inlet channel (9) is connected to the oil input port (202) of the oil pump body (2).

3. The oil supply mechanism of a screw compressor according to claim 2, characterized in that: One end of the oil outlet passage (10) is connected to the oil outlet port (203) of the oil pump body (2). The male rotor (5) and female rotor (6) form a rotor cavity with the machine body (3). The outer shell (1) at the rotor cavity is provided with a first oil suction port (12). The first oil suction port (12) is connected to the rotor cavity and the oil outlet passage (10) respectively.

4. The oil supply mechanism of a screw compressor according to claim 1, characterized in that: The tail end shaft (501) of the male rotor (5) is provided with a clamping nut (13), which is connected to the motor (4) housing.

5. The oil supply mechanism of a screw compressor according to claim 3, characterized in that: The outer casing (1) of the bearing is provided with a second oil suction port (14), which is connected to the oil outlet (10). The chamber at the bearing installation position is connected to the oil trough (7).

6. The oil supply mechanism of a screw compressor according to claim 1, characterized in that: The inner wall of the outer casing (1) near the oil pump body (2) is provided with symmetrical fixing holes, and the oil pump body (2) is connected to the fixing holes by fixing bolts (15).

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