Ventilation cooling structure with integrated design of screw main engine and motor

Abstract

The utility model discloses a screw host and motor integrated ventilation cooling structure, which relates to the field of screw compressors and comprises a motor shell, a stator winding arranged in the motor shell, a motor rotor rotating relative to the stator winding and a motor cantilever shaft connected and driven by the motor rotor. The screw machine head is installed at one end of the motor shell and communicated with the motor shell, a male rotor and a female rotor are arranged in an inner cavity of the screw machine head in a relatively rotating mode, the male rotor is connected and driven by a motor cantilever shaft, and a machine head exhaust port communicated with the inner cavity is formed in the outer wall of the screw machine head; and the gas filter element assembly is arranged at the other end of the motor shell, is provided with a gas inlet, and is communicated with the motor shell through a one-way gas inlet valve. According to the principle of negative pressure generated during operation of the air compressor, air is sucked from the air suction opening of the motor, is filtered by the air filter element, enters the cooling air duct of the motor through the air inlet valve, is sucked into the head of the air compressor, and is exhausted from the exhaust opening of the main engine.

Description

Technical Field

[0001] The utility model relates to the field of screw compressors, and particularly relates to a ventilation and cooling structure with an integrated design of a screw mainframe and a motor. Background Art

[0002] At present, the structure of a conventional screw compressor is as follows: it is connected through an air pipe outside the box body, passes through a gas filter element, and finally enters the suction port of the mainframe through a one-way intake valve and is blown out from the exhaust port. At the motor end, a cooling fan needs to be installed at the tail end of the motor to provide heat dissipation for the motor alone, making the overall volume of the compressor very large and the pipeline complex. For this reason, this integrated design mechanism and cooling method are invented. Content of the Utility Model

[0003] The purpose of the utility model is to overcome the deficiencies existing in the prior art, and to provide a ventilation and cooling structure with an integrated design of a screw mainframe and a motor. By using the negative pressure principle generated during the operation of the air compressor, air is inhaled from the air intake of the motor, impurities and dust in the air are filtered out through an air filter element, and then the air passes through the intake valve from the air filter element, passes through the motor cooling air duct from the intake valve, and is blown into the air compressor head from the motor cooling air duct and discharged from the exhaust port of the mainframe, thereby completing the cooling of the whole machine.

[0004] The purpose of the utility model is achieved by the following technical solutions: This ventilation and cooling structure with an integrated design of a screw mainframe and a motor includes:

[0005] A motor housing, which is internally provided with a stator winding, a motor rotor that rotates relative to the stator winding, and a motor cantilever shaft driven by the motor rotor;

[0006] A screw head, which is installed at one end of the motor housing and is communicated with the motor housing. A male rotor and a female rotor are rotatably arranged in the inner cavity of the screw head. The male rotor is driven by the motor cantilever shaft, and a head exhaust port communicated with the inner cavity is opened on the outer wall of the screw head; and

[0007] A gas filter element assembly, which is installed at the other end of the motor housing. The gas filter element assembly is provided with an air inlet and is communicated with the motor housing through an intake valve;

[0008] When the male rotor and the female rotor rotate, negative pressure is generated, so that air enters the gas filter element assembly from the air inlet, and the filtered air is blown into the motor housing from the intake valve, then inhaled into the inner cavity of the screw head, and is blown out through the head exhaust port at the same time.

[0009] As a further technical solution, a plurality of cooling air ducts are axially opened on the inner wall of the motor housing, and the cooling air ducts are evenly distributed along the circumferential direction of the inner wall, and the cooling air ducts are arranged between the outer circle of the stator winding and the motor housing.

[0010] As a further technical solution, an oil return hole is opened at the lower part of the motor housing, and an oil inlet hole communicating with its inner cavity is opened on the screw machine head. An oil return pipe for the motor is connected between the oil return hole and the oil inlet hole, and is used to return the excess oil in the motor housing to the screw machine head.

[0011] As a further technical solution, a motor junction box is arranged on the outer wall of the motor housing, and the motor junction box communicates with the inner cavity of the motor housing.

[0012] As a further technical solution, the screw machine head is fixedly connected to the motor housing through a transfer flange, and a plurality of flange air vents are opened on the screw machine head and communicate with the motor housing.

[0013] As a further technical solution, bearings are installed in the screw machine head for correspondingly supporting the male rotor and the female rotor, and the flange air vents are located above the bearings, so that the bearings are cooled when air passes through the flange air vents.

[0014] As a further technical solution, the gas filter element assembly further includes an air filter and an outer cover arranged on the outer periphery of the air filter. One end of the intake valve is connected to the motor housing, the other end of the intake valve communicates with the air filter, and a rear cover plate is detachably installed at the rear end of the outer cover.

[0015] As a further technical solution, the air inlet is opened along the axial direction of the outer cover and is evenly distributed along the circumferential direction of the outer cover.

[0016] The beneficial effects of the present utility model are as follows:

[0017] 1. Compared with the prior art, the cooling fan dedicated to cooling the motor is cancelled, and the integrated design makes the volume smaller;

[0018] 2. After the cooling air passes through the gas filter element assembly for filtration and then passes through the inside of the machine base, the heat dissipation effect is better and the heat dissipation capacity is improved;

[0019] 3. The air inlet duct originally required for the whole machine is cancelled, and the motor directly sucks air through the air inlet opened on the air filter cover at the rear end. The air compressor head, the motor, the intake valve and the gas filter element assembly adopt an integrated design, which is compact and beautiful, and the inside of the box is more concise;

[0020] 4. When the air passes through the flange air vents, the bearings will be cooled, the cooling effect of the bearings is improved, and the service life of the bearings is increased;

[0021] 5. The motor and the screw main engine are in a fully sealed state, and an intake valve is arranged at the rear end of the motor, which can isolate the leakage of oil and gas from the rear end of the motor and reduce the after-sales problems caused by oil leakage. Brief Description of the Drawings

[0022] Figure 1 It is a schematic cross-sectional structure diagram of the present utility model.

[0023] Figure 2 This is a three-dimensional structural schematic diagram of the present utility model.

[0024] Figure 3 This is a structural schematic diagram of the motor housing in the present utility model.

[0025] Explanation of reference numerals: Screw head 1, male rotor 2, female rotor 3, head exhaust port 4, bearing 5, flange air guide port 6, adapter flange 7, motor housing 8, stator winding 9, motor rotor 10, motor cantilever shaft 11, cooling air duct 12, motor junction box 13, intake valve 14, air filter element 15, outer cover 16, rear cover plate 17, intake port 18, motor oil return pipe 19. Detailed implementation manners

[0026] The following will introduce the present utility model in detail with reference to the drawings:

[0027] Embodiment: As shown in the attached Figures 1 to 3 figures, this integrated design ventilation and cooling structure of the screw main engine and the motor includes a screw head 1, a male rotor 2, a female rotor 3, a head exhaust port 4, a bearing 5, a flange air guide port 6, an adapter flange 7, a motor housing 8, a stator winding 9, a motor rotor 10, a motor cantilever shaft 11, a cooling air duct 12, a motor junction box 13, an intake valve 14, an air filter element 15, an outer cover 16, a rear cover plate 17, an intake port 18 and a motor oil return pipe 19.

[0028] Referring to the attached Figure 1 figures, a relatively fixed stator winding 9 is arranged inside the motor housing 8, and a relatively rotating motor rotor 10 is arranged inside the stator winding 9. The center of the motor rotor 10 is connected to drive a motor cantilever shaft 11.

[0029] A plurality of cooling air ducts 12 are axially formed on the inner wall of the motor housing 8. The cooling air ducts 12 are evenly distributed along the circumferential direction of the inner wall, and the cooling air ducts 12 are arranged between the outer circle of the stator winding 9 and the motor housing 8. A motor junction box 13 is arranged on the outer wall of the motor housing 8. The motor junction box 13 is communicated with the inner cavity of the motor housing 8, which is convenient for the motor to route wires and is externally connected to a power supply for power supply.

[0030] As shown in Figure 1 and 2 figures, an oil return hole is formed in the lower part of the motor housing 8, and an oil inlet hole communicated with its inner cavity is formed in the upper part of the screw head 1. The motor oil return pipe 19 is connected between the oil return hole and the oil inlet hole, so that the redundant oil in the motor housing 8 can flow back into the screw head 1.

[0031] Furthermore, the screw compressor head 1 (screw compressor) is installed at the front end of the motor housing 8, and the screw compressor head 1 is fixedly connected to the motor housing 8 through an adapter flange 7. At the same time, a plurality of flange air inlets 6 are opened on the screw compressor head 1, and the screw compressor head 1 communicates with the inner cavity of the motor housing 8 through the flange air inlets 6. A male rotor 2 and a female rotor 3 are rotatably arranged in the inner cavity of the screw compressor head 1. The male rotor 2 is driven by a motor cantilever shaft 11, and the female rotor 3 is then driven by the male rotor 2. At the same time, a compressor head exhaust port 4 communicating with the inner cavity is opened on the outer wall of the screw compressor head 1.

[0032] The gas filter element assembly is installed at the rear end of the motor housing 8. The gas filter element assembly includes an air filter element 15 and an outer cover 16 arranged on the outer periphery of the air filter element 15. An intake valve 14 is installed between the gas filter element assembly and the motor housing 8. One end of the intake valve 14 is connected to the motor housing 8, the other end of the intake valve 14 communicates with the air filter element 15, and a rear cover 17 is detachably installed at the rear end of the outer cover 16 to facilitate the replacement of the air filter element 15 in the outer cover 16. A plurality of intake ports 18 are axially opened on the outer cover 16, and the intake ports 18 are evenly distributed along the circumferential direction of the outer cover 16.

[0033] Preferably, two bearings 5 are installed in the screw compressor head 1. One of them is used to support the male rotor 2, and the other bearing 5 is used to support the female rotor 3. The flange air inlets 6 are located above the bearings 5, so that the air can cool the bearings 5 synchronously when passing through the flange air inlets 6, improving the bearing cooling effect and increasing the bearing service life.

[0034] When the motor works, the male rotor 2 is driven by the motor cantilever shaft 11. When the male rotor 2 and the female rotor 3 rotate, a negative pressure is generated, so that air enters the gas filter element assembly from the intake ports 18. The gas filter element assembly filters the air. The filtered air is first blown into the motor housing 8 from the intake valve 14, then sucked into the inner cavity of the screw compressor head 1, and finally blown out through the compressor head exhaust port 4.

[0035] The working process of the present utility model:

[0036] The compressor head includes: a male rotor and a female rotor. When the male and female rotors rotate, a negative pressure is generated, thereby sucking air through the air inlet into the gas filter element assembly and blowing it out through the head exhaust port. The motor includes: a motor housing. Inside the motor housing, there is a cooling air duct. The cooling air duct is arranged between the outer circumference of the motor stator and the housing. A sandwich air duct is formed between the two, which is the cooling air duct of the motor. There is an oil return hole in the bottom corner direction of the housing that communicates with the inner cavity of the motor. This oil return hole is connected to the inner cavity of the main unit through an oil pipe, and is used to return the excess oil inside the motor to the inside of the main unit through this oil pipe. A motor rotor is installed outside the hollow motor shaft to form a rotor assembly. The rotor assembly is fixed on the output shaft of the compressor head using the motor and the main unit fixing block and the center bolt to connect the motor and the main unit. An intake valve is installed at the rear end of the motor, which functions to blow the air passing through the air filter into the motor through the intake valve, preventing the leakage of gas and oil. And the intake valve is provided with an intake valve pressure relief hole. An air filter is installed behind the intake valve. An air filter outer cover is installed on the outer circumference of the air filter. A ventilation slot is opened around the side end or at the rear end of the outer cover for the air intake of the motor. The rear end of the outer cover is a detachable rear cover plate, which is convenient for replacing the air filter.

[0037] It can be understood that for those skilled in the art, equivalent substitution or change of the technical solution and the inventive concept of the present utility model should fall within the protection scope of the appended claims of the present utility model.

Claims

1. An integrated design ventilation and cooling structure for a screw main engine and a motor, characterized in that, Comprising: A motor housing (8) which is internally provided with a stator winding (9), a motor rotor (10) that rotates relative to the stator winding (9), and a motor cantilever shaft (11) driven by the motor rotor (10); A screw head (1) which is installed at one end of the motor housing (8) and communicates with the motor housing (8). A male rotor (2) and a female rotor (3) are rotatably arranged in the inner cavity of the screw head (1). The male rotor (2) is driven by the motor cantilever shaft (11). A head exhaust port (4) communicating with the inner cavity is provided on the outer wall of the screw head (1); and A gas filter element assembly which is installed at the other end of the motor housing (8). The gas filter element assembly is provided with an air inlet (18) and communicates with the motor housing (8) through an intake valve (14); When the male rotor (2) and the female rotor (3) rotate, a negative pressure is generated, causing air to enter the gas filter element assembly from the air inlet (18). The filtered air is blown into the motor housing (8) through the intake valve (14), then inhaled into the inner cavity of the screw head (1), and blown out through the head exhaust port (4) at the same time.

2. The integrated design ventilation and cooling structure of the screw main engine and the motor according to claim 1, characterized in that: A plurality of cooling air ducts (12) are axially provided on the inner wall of the motor housing (8). The cooling air ducts (12) are evenly distributed along the circumferential direction of the inner wall, and the cooling air ducts (12) are arranged between the outer circle of the stator winding (9) and the motor housing (8).

3. The integrated design ventilation and cooling structure of the screw main engine and the motor according to claim 1, wherein: A return oil hole is provided at the lower part of the motor housing (8), and an oil inlet hole communicating with its inner cavity is provided on the screw head (1). A motor return oil pipe (19) is connected between the return oil hole and the oil inlet hole for returning the excess oil in the motor housing (8) to the screw head (1).

4. The integrated design ventilation and cooling structure of the screw main engine and the motor according to claim 1, characterized in that: A motor junction box (13) is provided on the outer wall of the motor housing (8), and the motor junction box (13) communicates with the inner cavity of the motor housing (8).

5. The integrated design ventilation and cooling structure of the screw main engine and the motor according to claim 1, characterized in that: The screw head (1) is connected and fixed to the motor housing (8) through an adapter flange (7), and a plurality of flange air vents (6) are provided on the screw head (1) and communicate with the motor housing (8).

6. The integrated design ventilation and cooling structure of the screw main engine and the motor according to claim 5, characterized in that: Bearings (5) are installed in the screw head (1) for correspondingly supporting the male rotor (2) and the female rotor (3), and the flange air vents (6) are located above the bearings (5) so that the air cools the bearings (5) when passing through the flange air vents (6).

7. The integrated design ventilation and cooling structure of the screw main engine and the motor according to claim 1, wherein: The gas filter element assembly further includes an air filter element (15) and an outer cover (16) provided on the outer periphery of the air filter element (15). One end of the intake valve (14) is connected to the motor housing (8), and the other end of the intake valve (14) communicates with the air filter element (15). A rear cover (17) is detachably installed at the rear end of the outer cover (16).

8. The integrated design ventilation and cooling structure of the screw main engine and the motor according to claim 7, characterized in that: The air inlet (18) is axially provided on the outer cover (16) and is evenly distributed along the circumferential direction of the outer cover (16).

Images