A twin-screw air compressor

Abstract

The present invention relates to a twin-screw air compressor, comprising a housing and a twin-screw assembly. First, a driving member operates, driving a driving gear, which simultaneously drives two driven gears to rotate, and the two driven gears drive two male screws to rotate. Air is sequentially drawn from an air inlet pipe, one twin-screw assembly, another twin-screw assembly, and an air outlet pipe, thereby achieving air compression. The present invention reduces the length of the male and female screws of existing twin-screw air compressors by half, significantly reducing the space occupied by the present invention without affecting the compression effect.

Description

Technical Field

[0001] The present invention relates to the technical field of compressors, and in particular to a twin-screw air compressor. Background Art

[0002] Air compressors are mainly divided into three categories, namely piston compressors, rotary screw compressors and rotary vane compressors. Among them, rotary screw compressors usually use a twin-screw structure for air compression. The male screw and the female screw are one of the core components of the twin-screw air compressor. The two screws are meshed with each other and rotated. When the two screws are in a rotating state, the volume of air between them and in the cavity gradually decreases, thereby achieving the purpose of compressing the air. However, the longer the screw length of the existing air compressor, the better the air compression effect. However, when the space for placing the air compressor is limited, the length of the male screw and the female screw cannot be designed to be too long. Therefore, there is an urgent need for a device with limited length of the male screw and the female screw and good air compression effect. Summary of the Invention

[0003] The main purpose of the present invention is to provide a twin-screw air compressor to solve the problem that the existing twin-screw air compressor cannot adapt to the limited placement space because the male screw and the female screw are too long.

[0004] In order to achieve the above object, the present invention provides a twin-screw air compressor, comprising a casing and a twin-screw assembly;

[0005] The housing includes a first cavity and a second cavity. The front end of the first cavity is connected to the air inlet pipe, and the rear end of the first cavity is connected to the rear end of the second cavity. The second cavity is located directly below the first cavity, and the front end of the second cavity is connected to the air outlet pipe.

[0006] There are two twin-screw groups, which are respectively arranged in the first cavity and the second cavity;

[0007] Among them, each of the twin-screw groups includes a male screw and a female screw rotatably connected to the casing, and the two twin-screw groups are rotatably set in the first cavity and the second cavity respectively. The male screw and the female screw are meshed side by side, and one end of the two female screws is connected to a driven gear, and a driving gear is set between the two driven gears, and the driving gear is connected to drive its rotating driving member.

[0008] A preferred solution is that the female screw has a six-tooth structure, each tooth profile is identical and evenly distributed around the circumference, and each tooth profile includes a first circular arc, a first parabola, a first involute, a first ellipse, and a first conjugate curve;

[0009] The male screw has a four-tooth structure, each tooth profile is identical and evenly distributed around the circumference, and each tooth profile includes a second parabola, a second involute, a second conjugate curve, a second ellipse, a second circular arc, and a third involute.

[0010] A preferred solution is that the central angle between the first conjugate curve and the second conjugate curve is 1-2°.

[0011] A preferred solution is that both the first conjugate curve and the second conjugate curve are arc structures.

[0012] A preferred solution is that the radius of the first arc line is 3.5 mm; the radius of the second arc line is 4 mm.

[0013] A preferred solution is that the length of the female screw and the male screw are both 312 mm and are made of QT600;

[0014] The outer diameter of the female screw is 155mm, and the outer diameter of the male screw is 156mm;

[0015] The center distance between the female screw and the male screw is 124mm.

[0016] A preferred solution is that a heating device and an oil cooling nozzle are provided in the casing, a connecting cavity is formed at the connection point between the first cavity and the second cavity, and the heating device and the oil cooling nozzle are located in the connecting cavity.

[0017] A preferred solution is that the heating device is a heating rod.

[0018] A preferred solution is that the driving member is a motor, the base of the motor is fixed on the casing, and the output shaft of the motor is connected to the driving wheel.

[0019] The beneficial effects of the above scheme are as follows: first, the driving member works, the driving member drives the driving gear, and the driving gear simultaneously drives the two driven gears to rotate, and the two driven gears drive the two male screws to rotate. The air is sequentially passed through the air inlet pipe, one twin-screw group, the other twin-screw group, and the air outlet pipe. Through this structure, the purpose of air compression is achieved. Compared with the male and female screws of the existing twin-screw air compressor, the length of the present invention is shortened by half, which greatly reduces the space occupied by the present invention without affecting the compression effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] The present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0021] Figure 1 1 is a front structural schematic diagram of a twin-screw air compressor of the present invention;

[0022] Figure 2 1 is a schematic structural diagram of a first state cross-section of a twin-screw air compressor according to the present invention;

[0023] Figure 3 yes Figure 2 Schematic diagram of the enlarged structure of area A in the middle;

[0024] Figure 4 1 is a schematic structural diagram of a second state cross-section of the twin-screw air compressor of the present invention;

[0025] Figure 5 1 is a schematic structural diagram of a twin-screw air compressor of the present invention in a third state;

[0026] Figure 6 It is a schematic structural diagram of a cross-section of the male screw and the female screw of the twin-screw air compressor of the present invention;

[0027] Figure 7 It is a structural schematic diagram of the male screw and the female screw of the twin-screw air compressor of the present invention.

[0028] Description of Reference Numerals

[0029] 10. Casing; 11. First cavity; 12. Second cavity; 13. Air inlet pipe; 14. Air outlet pipe; 15. Connecting cavity; 20. Twin-screw assembly; 22. Male screw; 21. Female screw; 23. Driven gear; 24. Driving gear; 25. Driving member; 211. First circular arc; 212. First parabola; 213. First involute; 214. First ellipse; 215. First conjugate curve; 221. Second parabola; 222. Second involute; 223. Second conjugate curve; 224. Second ellipse; 225. Second circular arc; 226. Third involute; 30. Heating device; 40. Oil-cooling nozzle. DETAILED DESCRIPTION

[0030] The following is a clear and complete description of the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings in the embodiments of the present invention. In the following description, many specific details are set forth to facilitate a full understanding of the present invention. However, the present invention can also be implemented in other ways different from those described herein, and those skilled in the art can make similar generalizations without violating the connotation of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed below.

[0031] First embodiment:

[0032] like Figures 1 to 7As shown, this embodiment provides a twin-screw air compressor, including a housing 10 and a twin-screw assembly 20. The housing 10 includes a first cavity 11 and a second cavity 12. The front end of the first cavity 11 is connected to an air inlet pipe 13, and the rear end of the first cavity 11 is connected to the rear end of the second cavity 12. The second cavity 12 is located directly below the first cavity 11, and the front end of the second cavity 12 is connected to an air outlet pipe 14. There are two twin-screw assemblies 20, one in each of the first cavity 11 and the second cavity 12. Among them, each twin-screw group 20 includes a male screw 22 and a female screw 21, and the male screw 22 and the female screw 21 are rotatably arranged in the first cavity 11 or the second cavity 12. It should be supplemented that the male screw 22 and the female screw 21 are arranged in the same cavity, the male screw 22 and the female screw 21 are meshed side by side, and one end of the two female screws 21 is connected to a driven gear 23, and the two driven gears 23 are meshed to set a driving gear 24, and the driving gear 24 is connected to a driving member 25 for driving the rotation thereof. The driving member 25 is a motor, the base of the motor is fixed to the housing 10, and the output shaft of the motor is connected to the driving wheel.

[0033] First, the driving member 25 works, the driving member 25 drives the driving gear 24, and the driving gear 24 simultaneously drives the two driven gears 23 to rotate, and the two driven gears 23 drive the two female screws 21 to rotate, and the two female screws 21 successively drive the meshed female screws 21 to rotate, wherein the male screw 22 is driven, and the air is sequentially from the air inlet pipe 13, one set of twin-screw groups 20, the other twin-screw group 20, and the air outlet pipe 14, and the purpose of air compression is achieved through such a structure. The present invention saves half the length of the male screw 22 and the female screw 21 of the existing twin-screw air compressor, greatly reduces the space occupied by the present invention, and does not affect the compression effect.

[0034] Second embodiment:

[0035] The female screw 21 has a six-tooth structure, and the tooth profiles of each tooth are the same and evenly distributed around the circumference. Each tooth profile includes a first circular arc 211, a first parabola 212, a first involute 213, a first elliptical line 214 and a first conjugate curve 215; the male screw 22 has a four-tooth structure, and the tooth profiles of each tooth are the same and evenly distributed around the circumference. Each tooth profile includes a second parabola 221, a second involute 222, a second conjugate curve 223, a second elliptical line 224, a second circular arc 225 and a third involute 226.

[0036] The corresponding central angles of the first conjugate curve 215 and the second conjugate curve 223 are 1-2°.

[0037] The first conjugate curve 215 and the second conjugate curve 223 are both arc structures.

[0038] The radius of the first arc line 211 is 3.5 mm; the radius of the second arc line 225 is 4 mm.

[0039] The length of the female screw 21 and the male screw 22 are both 312 mm and are made of QT600;

[0040] The outer diameter of the female screw 21 is 155 mm, and the outer diameter of the male screw 22 is 156 mm;

[0041] The center distance between the female screw 21 and the male screw 22 is 124 mm.

[0042] The beneficial effects of the above embodiment are:

[0043] The present invention can reduce aerodynamic noise and vibration and improve the quiet performance of the machine.

[0044] The present invention adopts a tooth number design with a ratio of 6:4 between the female screw 21 and the male screw 22, which results in a small pressure difference between the unit volumes and large suction and exhaust openings, thereby improving the efficiency of the compressor.

[0045] The present invention adopts a tooth number design with a ratio of 6:4 between the female screw 21 and the male screw 22, which has a small height difference between the teeth, small backflow loss and high thermal efficiency.

[0046] The present invention adopts a design in which the number of teeth of the female screw 21 and the male screw 22 are in a ratio of 6:4, which reduces the processing difficulty and material requirements, and greatly reduces the production and processing costs.

[0047] In addition, the present invention has an asymmetric tooth design, and the leakage triangle area is smaller, which reduces the power loss of the airflow disturbed by the sharp corners of the female screw 21 and further improves the compression efficiency.

[0048] Third embodiment:

[0049] The housing 10 is provided with a heating device 30 and an oil cooling nozzle 40. The first cavity 11 and the second cavity 12 are connected to form a connecting cavity 15. The heating device 30 and the oil cooling nozzle are located in the connecting cavity 15. The heating device 30 is a heating rod.

[0050] The beneficial effects of the above embodiment are:

[0051] When compressed air enters the connecting cavity 15, it activates the heating rod, which heats the compressed air within the connecting cavity 15. This increases the pressure of the air within the connecting cavity 15, significantly improving the air compression effect. The oil cooling nozzle 40 is designed to ensure the safety of the structure by activating it when the temperature of the connecting cavity 15 reaches a certain level. The oil cooling nozzle 40 sprays cold oil, which cools the connecting cavity 15. The design of the heating device 30 and the oil cooling nozzle 40 ensures that the connecting cavity 15 is always kept at a constant temperature.

[0052] Obviously, the embodiments described are only some of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

Claims

1. A twin-screw air compressor, characterized in that: include: The housing includes a first cavity and a second cavity, wherein the front end of the first cavity is connected to an air inlet pipe, the rear end of the first cavity is connected to the rear end of the second cavity, the second cavity is located directly below the first cavity, and the front end of the second cavity is connected to an air outlet pipe; There are two twin-screw groups, and the two twin-screw groups are respectively arranged in the first cavity and the second cavity; Wherein, each of the twin-screw groups includes a male screw and a female screw rotatably connected to the housing, and the two twin-screw groups are rotatably arranged in the first cavity and the second cavity respectively, the male screw and the female screw are arranged side by side and meshed, one end of the two female screws are connected to a driven gear, a driving gear is meshed between the two driven gears, and the driving gear is connected to a driving member for driving the rotation thereof; The female screw has a six-tooth structure, each tooth profile is identical and evenly distributed around the circumference, and each tooth profile is composed of a first circular arc, a first parabola, a first involute, a first ellipse, and a first conjugate curve connected in sequence; The male screw has a four-tooth structure, each tooth profile is identical and evenly distributed around the circumference, and each tooth profile consists of a second parabola, a second involute, a second conjugate curve, a second ellipse, a second circular arc and a third involute connected in sequence.

2. The twin-screw air compressor according to claim 1, characterized in that: The central angle between the first conjugate curve and the second conjugate curve is 1-2°.

3. The twin-screw air compressor according to claim 1, characterized in that: The first conjugate curve and the second conjugate curve are both arc structures.

4. The twin-screw air compressor according to claim 1, characterized in that: The radius of the first arc line is 3.5 mm; the radius of the second arc line is 4 mm.

5. The twin-screw air compressor according to claim 1, characterized in that: The length of the female screw and the male screw are both 312 mm, and both are made of QT600; The outer diameter of the female screw is 155 mm, and the outer diameter of the male screw is 156 mm; The center distance between the female screw and the male screw is 124 mm.

6. The twin-screw air compressor according to claim 1, characterized in that: A heating device and an oil cooling nozzle are provided in the casing. A connecting cavity is formed at the connection point between the first cavity and the second cavity. The heating device and the oil cooling nozzle are located in the connecting cavity.

7. The twin-screw air compressor according to claim 6, characterized in that: The heating device is a heating rod.

8. The twin-screw air compressor according to claim 1, characterized in that: The driving component is a motor, the base of the motor is fixed on the housing, and the output shaft of the motor is connected to the driving gear.

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