Double-screw compressor

Abstract

The invention provides a double-screw compressor. The double-screw compressor comprises a first shell, a second shell, a male rotor and a female rotor, the first shell is provided with a first inner cavity; the second shell is arranged in the first inner cavity and fixed to the first shell, the second shell is provided with a second inner cavity, and the second shell is provided with an exhaust pipe opening so that the second inner cavity can be communicated with the outside of the first shell. The second shell is provided with an air inlet opening so that an air inlet in at least one side of the first shell can enter the second inner cavity. The arrangement of a gas flow channel is changed through the nested structure of the first shell and the second shell, distortion of the shells caused by uneven temperature distribution of the shells is reduced, and the technical problem that in the prior art, no double-screw compressor structure for balancing heat and preventing deformation of the shells exists, and consequently a rotor collides with the shells is solved.

Description

Technical field:

[0001] The invention relates to the technical field of screw compressors, in particular to a twin-screw compressor. Background technology:

[0002] When the screw compressor is working, the shell temperature is higher at the exhaust port and the cylinder compression chamber near the exhaust port, while the temperature is lower at the suction chamber near the inlet port. The uneven temperature distribution of the shell causes the shell to twist and deform. The twisting and deformation of the shell will cause the tiny gap between the rotor and the shell to be uneven, resulting in friction between the rotor and the shell.

[0003] Therefore, in order to avoid the friction between the rotor and the shell, a twin-screw compressor is urgently needed to help solve the technical problem in the prior art that there is a lack of a twin-screw compressor structure to balance heat and prevent shell deformation, which leads to collision between the rotor and the shell. Summary of the invention:

[0004] In one embodiment, the present invention provides a twin-screw compressor, which changes the gas flow path layout through the nested structure of a first shell and a second shell, uses the low-temperature gas at the air inlet to cool the high-temperature area of ​​the shell around the shell exhaust port and the cylinder compression chamber, thereby reducing the distortion of the shell caused by uneven temperature distribution of the shell, and helps to solve the technical problem in the prior art that there is a lack of a twin-screw compressor structure to balance heat and prevent shell deformation, which leads to collision between the rotor and the shell.

[0005] The twin-screw compressor comprises a first shell and a second shell, and a male rotor and a female rotor;

[0006] The first housing has a first internal cavity;

[0007] The second shell is disposed in the first internal cavity and fixed on the first shell, the second shell has a second internal cavity, the second shell is provided with an exhaust pipe opening to connect the second internal cavity with the outside of the first shell, and the second shell is provided with an air inlet opening to allow the air inlet on at least one side of the first shell to enter the second internal cavity;

[0008] The male rotor and the female rotor are in the second internal cavity and mesh with each other to achieve the function of compressing gas.

[0009] In one embodiment, the air inlet is arranged on two sides, and the exhaust pipe opening is located on a side adjacent to the air inlet.

[0010] In one embodiment, the second internal cavity has a first cylinder body and a second cylinder body, which are respectively used to accommodate the male rotor and the female rotor, and a gap is reserved between the first cylinder body and the second cylinder body.

[0011] In one embodiment, the first cylinder body and the second cylinder body have a cylinder air intake port, so that the gas introduced by the air intake port can enter the first cylinder body and the second cylinder body.

[0012] In one embodiment, the twin-screw compressor further comprises a rear bearing support seat and a front end cover, and a rear end cover;

[0013] The front bearing support seat is fixed to one end of the first housing;

[0014] The rear end cover is fixed on the rear bearing support seat;

[0015] The front end cover is fixed to the other end of the first shell.

[0016] In one embodiment, the second housing has a first sealed cavity, and the first sealed cavity is connected to the first bearing cavity inside.

[0017] In one embodiment, a closed balancing cavity is provided between the first shell and the second shell, and the balancing cavity is communicated with the first sealed cavity.

[0018] In one embodiment, a closed gas passage is provided between the first shell and the second shell and is communicated with the gas inlet.

[0019] In one embodiment, the gas channel is provided with support ribs between the first shell and the second shell, and the support ribs are provided on the side close to the high temperature zone to connect the first shell and the second shell, and the support ribs are provided on one side of the high temperature zone of the cylinder and are perpendicular to the central axis of the two cylindrical spaces of the cylinder. The support ribs play a role in supporting the cylinder when the high temperature zone of the cylinder elongates due to the increase in temperature.

[0020] In one embodiment, the first bearing cavity is provided with a bearing, and the first sealing cavity is provided with a sealing and plugging structure. Description of the drawings:

[0021] Figure 1 A structural cross-sectional view of a screw compressor provided in an embodiment of the present application;

[0022] Figure 2 A three-dimensional diagram of a first housing in a screw compressor provided in an embodiment of the present application;

[0023] Figure 3 A three-dimensional view from another perspective of a first housing in a screw compressor provided in an embodiment of the present application;

[0024] Figure 4 A three-dimensional diagram of a second housing in a screw compressor provided in an embodiment of the present application;

[0025] Figure 5A sectional view of the main casing structure of a screw compressor provided in an embodiment of the present application.

[0026] Reference numerals:

[0027] First housing 1

[0028] The first inner cavity 11

[0029] Second shell 2

[0030] Second inner cavity 21

[0031] Exhaust pipe outlet 22

[0032] Air Inlet 23

[0033] First cylinder 24

[0034] Second cylinder 25

[0035] Cylinder air intake port 26

[0036] First bearing cavity 28

[0037] First sealed cavity 27

[0038] Male rotor 3

[0039] Female rotor 4

[0040] Rear bearing support seat 5

[0041] Rear end cover 6

[0042] Front cover 7

[0043] Balance chamber 8

[0044] Gas channel 9

[0045] Support rib 10 Specific embodiment:

[0046] In order to enable those skilled in the art to better understand the technical solution of the present invention, the present invention is described in detail below in conjunction with the accompanying drawings and specific implementation methods.

[0047] Various aspects and features of the present application are described herein with reference to the accompanying drawings.

[0048] These and other characteristics of the present application will become apparent from the following description of a preferred form of embodiment given as a non-limiting example with reference to the accompanying drawings.

[0049] It should also be understood that, although the present application has been described with reference to some specific examples, those skilled in the art will be able to realize many other equivalent forms of the present application that have the features described in the claims and are therefore within the scope of protection defined thereby.

[0050] The above and other aspects, features and advantages of the present application will become more apparent in view of the following detailed description when taken in conjunction with the accompanying drawings.

[0051] Specific embodiments of the present application are described hereinafter with reference to the accompanying drawings; however, it should be understood that the embodiments applied for are merely examples of the present application, which may be implemented in a variety of ways. Well-known and / or repeated functions and structures are not described in detail to determine the true intent based on the user's historical operations and to avoid unnecessary or redundant details that make the present application unclear. Therefore, the specific structural and functional details applied for herein are not intended to be limiting, but are merely used as the basis and representative basis for the claims to teach those skilled in the art to use the present application in a variety of ways with substantially any suitable detailed structure.

[0052] This specification may use the phrases "in one embodiment," "in another embodiment," "in yet another embodiment," or "in other embodiments," all of which may refer to one or more of the same or different embodiments according to the present application.

[0053] Figure 1 A structural cross-sectional view of a screw compressor provided in an embodiment of the present application; Figure 2 A three-dimensional diagram of a first housing in a screw compressor provided in an embodiment of the present application; Figure 3 A three-dimensional view from another perspective of a first housing in a screw compressor provided in an embodiment of the present application; Figure 4 A three-dimensional diagram of a second housing in a screw compressor provided in an embodiment of the present application; Figure 5 A sectional view of the main casing structure of a screw compressor provided in an embodiment of the present application.

[0054] like Figures 1 to 5 As shown, in one embodiment, the invention provides a twin-screw compressor, which includes a first shell 1, a second shell 2, a male rotor 3 and a female rotor 4;

[0055] The first housing 1 has a first internal cavity 11;

[0056] The second shell 2 is disposed in the first internal cavity 11 and fixed on the first shell 1. The second shell 2 has a second internal cavity 21. The second shell 2 is provided with an exhaust pipe port 22 to connect the second internal cavity 21 with the outside of the first shell 1. The second shell 2 is provided with a cylinder air intake port 26 to allow the air inlet 23 on at least one side of the first shell 1 to enter the second internal cavity 21.

[0057] The male rotor 3 and the female rotor 4 are in the second inner cavity 21 and mesh with each other to achieve the function of compressing the gas.

[0058] In this embodiment, a specific implementation of a twin-screw compressor is provided. Through the air inlet 23 and the exhaust pipe port 22, which is also the hardware structure of the exhaust port, a structure for cooling the entire shell is formed after reasonable configuration, which helps to solve the technical problem that there is a lack of a twin-screw compressor structure in the prior art to balance heat and prevent shell deformation, resulting in collision between the rotor and the shell.

[0059] In one embodiment, the air inlet 23 is disposed on both sides, and the exhaust pipe opening 22 is located on a side adjacent to the air inlet 23 .

[0060] In this embodiment, a specific structure is provided in which the air inlets 23 are arranged on both sides and the exhaust pipe port 22 is arranged on the top.

[0061] In one embodiment, the second internal cavity 21 has a first cylinder body 24 and a second cylinder body 25, which are used to accommodate the male rotor 3 and the female rotor 4, respectively, and a gap is reserved between the first cylinder body 24 and the second cylinder body 25. The first cylinder body 24 and the second cylinder body 25 are cylindrical spaces with two central axes parallel to each other and intersecting. The female and male rotors are installed in the cylinders. The female and male rotors rotate to generate the working process of suction and compression of gas, and the exhaust port is connected to one end of the cylinder.

[0062] In one embodiment, the first cylinder 24 and the second cylinder 25 have a cylinder air intake port 26, so that the gas introduced by the air intake port 23 can enter the first cylinder 24 and the second cylinder 25. The area of ​​the cylinder near the exhaust port is the compression chamber area, which is the area where the gas is compressed and generates high temperature during operation;

[0063] The cylinder, i.e. the first cylinder body 24 and the second cylinder body 25, has a cylinder air intake port at the other end, the cylinder air intake port is connected to the gas channel, the gas channel is connected to the air inlet, the gas channel is distributed around the exhaust port and the high temperature zone near the exhaust port, the low temperature gas entering the air inlet flows more evenly through the outer wall of the exhaust port and the high temperature zone shell near the exhaust port, thereby reducing the temperature of these shells and reducing the distortion of the shell caused by uneven temperature distribution of the shell.

[0064] The temperature of the compressed gas is high. In order to reduce the impact of high temperature on the shell, the exhaust pipe should be as short as possible.

[0065] In one embodiment, the twin-screw compressor further includes a rear bearing support 5, a rear end cover 6, and a front end cover 7;

[0066] The rear bearing support seat 5 is fixed to one end of the first housing 1;

[0067] The rear end cover 6 is fixed on the rear bearing support seat 5;

[0068] The front end cover 7 is fixed to the other end of the first housing 1 .

[0069] In one embodiment, the second housing 2 has a first sealed cavity 27, and the first sealed cavity 27 is connected to the internal first bearing cavity 28. The front cover 7 prevents oil leakage from the first bearing cavity; and the male rotor shaft extends out of the front cover for connecting the driving device. The rear cover 6 prevents oil leakage from the second bearing cavity.

[0070] In one embodiment, a closed balancing chamber 8 is provided between the first shell 1 and the second shell 2 , and the balancing chamber 8 is communicated with the first sealed chamber 27 .

[0071] In one embodiment, a closed gas channel 9 is further provided between the first shell 1 and the second shell 2, which is connected to the air inlet 23. In general, the air flow channel 9 connects the air inlet and the cylinder air intake port, and the air flow channel is arranged around the exhaust port and the high temperature area around it. When the low-temperature gas entering the air inlet flows through the gas channel, it can flow through the wall of the high temperature area around the exhaust port and the surrounding area more evenly, and the high temperature area around the exhaust port and the surrounding area can be cooled, thereby reducing the distortion and deformation of the shell caused by thermal barrier and shrinkage.

[0072] In one embodiment, the gas channel 9 is provided with support ribs 10 between the first shell 1 and the second shell 2. The first shell is provided with support ribs perpendicular to the axis of the cylindrical space of the cylinder on the side close to the high temperature zone to support the cylinder and the outer wall of the first shell. When the high temperature zone of the cylinder is heated and elongated, the support ribs are tilted, which will not cause deformation of the outer wall of the first shell, reduce the distortion of the first shell, and prevent the rotor and the shell from rubbing.

[0073] In one embodiment, the first bearing cavity 28 is provided with a bearing, and the first sealing cavity 27 is provided with a sealing and blocking structure. The first sealing cavity and the first bearing cavity are coaxial with the two cylindrical spaces of the cylinder respectively, and the first sealing cavity is provided with a first shaft seal to prevent the gas in the cylinder from leaking into the first bearing cavity. The first bearing cavity is provided with a first bearing to support the rotation of the female rotor and the male rotor and limit the axial displacement of the female rotor and the male rotor.

[0074] The rear bearing support seat 5 is also provided with two second sealing chambers and two second bearing chambers; after the first shell and the rear bearing support seat 5 are fixedly connected, the second sealing chamber and the second bearing chamber are coaxial with the two cylindrical spaces of the cylinder respectively, and the second sealing chamber is provided with a second shaft seal to prevent the gas in the cylinder from leaking into the second bearing chamber, and the second bearing chamber is provided with a second bearing to support the rotation of the female rotor and the male rotor.

[0075] The first bearing and the second bearing together support the negative rotor and the positive rotor to rotate in the cylinder to complete the process of suction, compression and exhaust. The flow direction of the gas is the air inlet, the gas channel, the cylinder suction port, the cylinder suction chamber, the cylinder compression chamber and the exhaust port. The gas enters the volume between the teeth of the negative rotor and the positive rotor in the cylinder suction chamber from the cylinder suction port, reduces the volume between the teeth of the negative rotor and the positive rotor in the cylinder compression chamber, and compresses the gas, and the compressed gas is discharged from the exhaust port.

[0076] When the gas is compressed in the compression chamber, the gas temperature rises. During the compression and exhaust process, the high-temperature gas heats the cylinder compression chamber and exhaust port walls, causing a high-temperature area to form in the shell. When the low-temperature gas entering from the air inlet flows through the gas channel, it cools the high-temperature area of ​​the shell, thereby lowering the temperature of the high-temperature area of ​​the shell and reducing the torque deformation of the shell.

[0077] The first shell is provided with two air inlets, and air can be taken in from the two air inlets at the same time, or one air inlet can be closed and air can be taken in from only one air inlet.

[0078] The first shell is provided with a balance chamber, and the balance chamber is used to guide the leaked gas from the first sealing chamber into other low-pressure pipelines.

[0079] The first shell is provided with a first supporting rib, which is arranged on a side close to the second shell, connecting the shell and the cylinder, and the first supporting rib is arranged on one side of the high-temperature zone of the cylinder and is perpendicular to the central axis of the two cylindrical spaces of the cylinder. The first supporting rib plays a role in supporting the cylinder. When the high-temperature zone of the cylinder elongates due to the increase in temperature, the first supporting rib is deflected to offset the deformation of the high-temperature zone of the cylinder. The elongation of the cylinder will not cause the main shell to deform.

[0080] Beneficial effects:

[0081] Compared with the prior art, the present application provides a screw compressor including a first shell, a second shell, a female rotor, and a male rotor. In the present application, a main shell composed of the first shell and the second shell is provided with an air inlet, an exhaust port, a cylinder, and a gas channel. The gas channel is connected to the air inlet, and the gas channel is distributed around the exhaust port and a high-temperature zone near the exhaust port. The low-temperature gas entering the air inlet flows through the air inlet channel and flows more evenly through the outer wall of the exhaust port and the high-temperature zone shell near the exhaust port, thereby reducing the temperature of these shell areas and reducing the distortion of the shell caused by uneven temperature distribution of the shell. At the same time, the first shell is provided with a first support rib, which is provided on a side close to the second shell, connecting the shell and the cylinder, and the first support rib is provided on one side of the high-temperature zone of the cylinder and is perpendicular to the central axis of the two cylindrical spaces of the cylinder. The first support rib plays a role in supporting the cylinder. When the high-temperature zone of the cylinder is elongated due to the increase in temperature, the first support rib is deflected to offset the deformation of the high-temperature zone of the cylinder. The elongation of the cylinder will not cause the main shell to deform.

[0082] The above embodiments are only exemplary embodiments of the present invention and are not intended to limit the present invention. The protection scope of the present invention is defined by the claims. Those skilled in the art may make various modifications or equivalent substitutions to the present invention within the essence and protection scope of the present invention, and such modifications or equivalent substitutions shall also be deemed to fall within the protection scope of the present invention.

Claims

1. A twin-screw compressor, characterized in that: The twin-screw compressor comprises: A first housing (1) having a first internal cavity (11); a second shell (2) disposed in the first internal cavity (11) and fixed to the first shell (1), the second shell (2) having a second internal cavity (21), the second shell (2) being provided with an exhaust pipe opening (22) so that the second internal cavity (21) is in communication with the outside of the first shell (1), and the second shell (2) being provided with a cylinder air intake port (26) so that the air intake port (23) on at least one side of the first shell (1) enters the second internal cavity (21); A male rotor (3) and a female rotor (4), wherein the male rotor (3) and the female rotor (4) are in the second internal cavity (21) and mesh with each other to achieve the function of compressing gas.

2. The twin-screw compressor according to claim 1, characterized in that: The air inlet (23) is arranged on both sides, and the exhaust pipe opening (22) is located on a side adjacent to the air inlet (23).

3. The twin-screw compressor according to claim 2, characterized in that: The second internal cavity (21) has a first cylinder body (24) and a second cylinder body (25), which are used to accommodate the male rotor (3) and the female rotor (4) respectively, and a gap is reserved between the first cylinder body (24) and the second cylinder body (25).

4. The twin-screw compressor according to claim 3, characterized in that: The first cylinder body (24) and the second cylinder body (25) have a cylinder air intake port (26) to enable the gas introduced through the air intake port (23) to enter the first cylinder body (24) and the second cylinder body (25).

5. The twin-screw compressor according to claim 4, characterized in that: The twin-screw compressor also includes: A rear bearing support seat (5) fixed to one end of the first housing (1); A rear end cover (6) fixed on the rear bearing support seat (5); A front end cover (7) is fixed to the other end of the first shell (1).

6. The twin-screw compressor according to claim 5, characterized in that: The second housing (2) has a first sealed cavity (27), and the first sealed cavity (27) is connected to a first bearing cavity (28) inside.

7. The twin-screw compressor according to claim 6, characterized in that: A closed balancing chamber (8) is provided between the first shell (1) and the second shell (2), and the balancing chamber (8) is communicated with the first sealed chamber (27).

8. The twin-screw compressor according to claim 7, characterized in that: A closed gas passage (9) is also provided between the first shell (1) and the second shell (2), and is communicated with the gas inlet (23).

9. The twin-screw compressor according to claim 8, characterized in that: The gas passage (9) is provided with a support rib (10) between the first shell (1) and the second shell (2); the support rib (10) is provided on the side close to the high temperature zone, connecting the first shell (1) and the second shell (2); and the first support rib is provided on the side of the high temperature zone of the cylinder and is perpendicular to the central axis of the two cylindrical spaces of the cylinder; the support rib (10) plays a role in supporting the cylinder; when the high temperature zone of the cylinder is elongated due to the increase in temperature, the support rib (10) is tilted, thereby reducing the deformation of the first shell (1) caused by the deformation of the cylinder.

10. The twin-screw compressor according to claim 9, characterized in that: The first bearing cavity (28) is provided with a bearing, and the first sealing cavity (27) is provided with a sealing and blocking structure.

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