A screw compressor

Abstract

The application discloses a screw compressor, which comprises a cylinder, a female rotor and a male rotor installed in the cylinder, an exhaust seat installed at an exhaust end of the cylinder, an exhaust port provided on the exhaust seat and communicated with the cylinder, an exhaust end cover connected to an end of the exhaust seat away from the cylinder, sealing assemblies provided at exhaust ends of the female rotor and the male rotor, a cavity provided between one side of the exhaust seat close to the cylinder and the sealing assemblies, the cavity being connected and communicated with the exhaust port, first and second adjusting blocks installed in the cavity, the first adjusting block being sleeved with the male rotor, the first adjusting block being provided with a first gas flow channel in a radial direction, the second adjusting block being sleeved with the female rotor, and the second adjusting block being provided with a second gas flow channel in the radial direction, and high-pressure gas at the exhaust port entering the cavity and supporting the male rotor in the radial direction through the first gas flow channel and supporting the female rotor in the radial direction through the second gas flow channel.

Description

Technical Field

[0001] This invention relates to the field of compressor technology, and more specifically to a screw compressor. Background Technology

[0002] Screw compressors typically use gas as a medium for intake, compression, and exhaust, completing the gas compression process through the rotation of a pair of screw rotors. During operation, the screw compressor generates gas forces acting on the rotors, which can be decomposed into axial and radial forces. Bearings are installed at both ends of the rotors to support the male and female rotors and withstand these axial and radial forces. When the compressor's intake and exhaust pressures are high or the pressure difference is large, significant gas forces are generated. If these gas forces are not balanced, they will act directly on the rotors, leading to excessive stress, insufficient bearing capacity, severe bearing wear, and a short lifespan. This results in challenges related to compressor sealing design and bearing selection, and the possibility of rotor misalignment under radial forces.

[0003] To address the aforementioned issues, patent CN102052315B discloses a screw compressor, comprising: a body; a compressor rotor; bearing components; a slide valve; the body having a slide valve cavity for accommodating the slide valve and a compression cavity for accommodating the compressor rotor; the compressor rotor being supported within the compression cavity by the bearing components; and the distance d1 from the lowest point of the outer circle of the compressor rotor to the lowest point of the compression cavity being greater than the distance from the highest point of the outer circle of the compressor rotor to the highest point of the compression cavity. In this technical solution, when the compressor rotor shifts longitudinally downwards under the action of radial force, the distance d1 from the lowest point of the outer circle of the compressor rotor to the lowest point of the compression cavity is greater than the distance from the highest point of the outer circle of the compressor rotor to the highest point of the compression cavity. Therefore, a gap remains between the compressor rotor and the body to prevent friction between the rotor and the body. However, this technical solution is relatively complex, requires high precision in compressor manufacturing, is difficult to produce, and has high costs. Furthermore, it still cannot solve the problem of rotor shifting under radial force. Summary of the Invention

[0004] The technical problem to be solved by the present invention is to provide a screw compressor, which has a cavity in the exhaust seat and an adjusting block installed in the cavity. By introducing high-pressure gas from the exhaust port into the cavity, the high-pressure gas is guided by the adjusting block to act on the male and female rotors in the opposite direction to the radial force, thereby balancing the radial force, avoiding rotor misalignment, and extending the service life of the bearings.

[0005] This invention provides a screw compressor, including a cylinder, a male rotor and a female rotor installed inside the cylinder, an exhaust seat installed at the exhaust end of the cylinder, the exhaust seat having an exhaust port communicating with the cylinder, an exhaust end cover connected to the end of the exhaust seat away from the cylinder, and sealing components provided at the exhaust ends of both the male and female rotors. A cavity is provided between the side of the exhaust seat near the cylinder and the sealing components, and this cavity is connected to the exhaust port. A first adjusting block and a second adjusting block are installed in the cavity, and both the first and second adjusting blocks are connected to the exhaust seat. The first adjusting block is sleeved with the male rotor and has a first gas flow channel in the radial direction. The second adjusting block is sleeved with the female rotor and has a second gas flow channel in the radial direction. High-pressure gas at the exhaust port enters the cavity and provides radial support to the male rotor through the first gas flow channel and radial support to the female rotor through the second gas flow channel.

[0006] In this technical solution, a male rotor and a female rotor are installed inside the cylinder. An intake seat is installed at the intake end of the cylinder, and the intake seat has an intake port communicating with the cylinder. An intake end cover is connected to the end of the intake seat away from the cylinder. An exhaust seat is installed at the exhaust end of the cylinder, and the exhaust seat has an exhaust port communicating with the cylinder. An exhaust end cover is connected to the end of the exhaust seat away from the cylinder. During compressor operation, gas is drawn into the cylinder through the intake port, compressed into high-pressure gas, and then discharged from the exhaust port, thus completing the processes of intake, compression, and exhaust. The intake ends of the male and female rotors are installed in the intake seat, and the exhaust ends of the male and female rotors are installed in the exhaust seat. Both the exhaust ends of the male and female rotors are equipped with sealing components to prevent internal leakage of the compressor. By providing a cavity communicating with the exhaust port within the exhaust seat, high-pressure gas at the exhaust port can enter the cavity. A first adjusting block and a second adjusting block are both connected to the exhaust seat and installed within the cavity. The first adjusting block and the second adjusting block can guide the high-pressure gas within the cavity. A first gas flow channel is radially arranged on the adjusting block. High-pressure gas in the cavity acts directly on the rotor shaft of the male rotor along the first gas flow channel. Under the guidance of the first gas flow channel, the high-pressure gas acts in the opposite direction to the radial force, providing radial support to the male rotor and thus balancing the radial force on the male rotor. Similarly, a second gas flow channel is radially arranged on the second adjusting block. High-pressure gas in the cavity acts directly on the rotor shaft of the female rotor along the second gas flow channel. Under the guidance of the second gas flow channel, the high-pressure gas acts in the opposite direction to the radial force, providing radial support to the female rotor and thus balancing the radial force on the female rotor. This prevents the male and female rotors from shifting, reduces the forces on the components on the rotor shaft, and extends the service life of bearings and other components. Furthermore, this technical solution directly introduces high-pressure gas into the cavity from the exhaust port to balance the radial force, eliminating the need for an external air pump and requiring no changes to the existing system, making it simple and efficient.

[0007] As an improvement, a first sealing cover and a second sealing cover are installed on the side of the exhaust seat near the cylinder. The first sealing cover is sleeved with the male rotor, and the second sealing cover is sleeved with the female rotor. The first and second sealing covers cooperate to isolate the cylinder and the cavity. In this technical solution, by installing the first and second sealing covers on the exhaust seat, the first and second sealing covers can prevent the high-pressure gas in the cavity from flowing to the cylinder, preventing internal leakage and making the use more reliable. On the other hand, the first sealing cover is sleeved with the male rotor, and the surface of the first sealing cover away from the cylinder is in contact with the surface of the first adjusting block, which makes the gas flow along the first gas flow channel more efficient and can better balance the radial force.

[0008] As an improvement, the outer diameter of the first adjusting block is smaller than the inner wall aperture of the cavity, and there is a gap between the outer wall of the first adjusting block and the inner wall of the cavity. This gap forms a third gas flow channel, which is connected to the first gas flow channel. The high-pressure gas in the cavity flows through the third gas flow channel to the first gas flow channel to provide radial support for the male rotor. In this technical solution, the outer diameter of the first adjusting block is set to be smaller than the inner wall aperture of the cavity. When the first adjusting block is installed in the cavity, there is a gap between the outer wall of the first adjusting block and the inner wall of the cavity. This gap forms a third gas flow channel for high-pressure gas to flow through. The third gas flow channel and the first gas flow channel form a built-in flow channel. The high-pressure gas at the exhaust port enters the cavity, and the high-pressure gas in the cavity flows along the third gas flow channel to the first gas flow channel to provide radial support for the male rotor. The gas flow efficiency is high, the high-pressure gas loss is small, and the radial force on the male rotor can be better balanced.

[0009] As an improvement, the outer diameter of the second adjusting block is smaller than the inner wall aperture of the cavity, and there is a gap between the outer wall of the second adjusting block and the inner wall of the cavity. This gap forms a fourth gas flow channel, which is connected to the second gas flow channel. The high-pressure gas in the cavity flows through the fourth gas flow channel to the second gas flow channel to provide radial support for the female rotor. In this technical solution, the outer diameter of the second adjusting block is set to be smaller than the inner wall aperture of the cavity. When the second adjusting block is installed in the cavity, there is a gap between the outer wall of the second adjusting block and the inner wall of the cavity. This gap forms a fourth gas flow channel for high-pressure gas to flow through. The fourth gas flow channel and the second gas flow channel form a built-in flow channel. The high-pressure gas at the exhaust port enters the cavity, and the high-pressure gas in the cavity flows along the fourth gas flow channel to the second gas flow channel to provide radial support for the female rotor. The gas flow efficiency is high, the high-pressure gas loss is small, and the radial force on the female rotor can be better balanced.

[0010] As an improvement, the first adjusting block is provided with a first mounting hole, through which a fastener passes to install the first adjusting block onto the exhaust seat. The second adjusting block is provided with a second mounting hole, through which a fastener passes to install the second adjusting block onto the exhaust seat. In this technical solution, by providing a first mounting hole on the first adjusting block and fixing it to the exhaust seat with a fastener through the first mounting hole, the installation stability of the first adjusting block is improved. Similarly, by providing a second mounting hole on the second adjusting block and fixing it to the exhaust seat with a fastener through the second mounting hole, the installation stability of the second adjusting block is improved.

[0011] As an improvement, multiple first mounting holes are provided circumferentially. The first adjusting block is connected to the exhaust seat through the first mounting holes at different positions to change the installation angle, thereby changing the angle of the first gas flow channel within the cavity. In this technical solution, by providing multiple first mounting holes on the first adjusting block, and distributing these holes circumferentially, the connection of the first mounting holes at different positions to the exhaust seat results in different installation angles for the first adjusting block on the exhaust seat. That is, by changing the first mounting holes connected to the exhaust seat, the first adjusting block can change its installation angle on the exhaust seat, thereby changing the angle of the first gas flow channel within the cavity. This allows the position of the first gas flow channel within the cavity to change circumferentially. Users can adjust the angle of the first adjusting block as needed, so that the high-pressure gas within the first gas flow channel can more accurately correspond to the radial force, more flexibly control the direction of the high-pressure gas balancing the radial force, and achieve higher balancing efficiency.

[0012] As an improvement, multiple second mounting holes are provided circumferentially. The second adjusting block is connected to the exhaust seat through the second mounting holes at different positions to change the installation angle, thereby changing the angle of the second gas flow channel within the cavity. In this technical solution, by providing multiple second mounting holes on the second adjusting block, and distributing these holes circumferentially, the connection of the second mounting holes at different positions to the exhaust seat results in different installation angles for the second adjusting block on the exhaust seat. That is, by changing the second mounting holes connected to the exhaust seat, the second adjusting block can change its installation angle on the exhaust seat, thereby changing the angle of the second gas flow channel within the cavity. This allows the position of the second gas flow channel within the cavity to change circumferentially. Users can adjust the angle of the second adjusting block as needed, so that the high-pressure gas within the second gas flow channel can more accurately correspond to the radial force, more flexibly control the direction of the high-pressure gas balancing the radial force, and achieve higher balancing efficiency.

[0013] As an improvement, the exhaust port and the cavity are connected by an external pipe. This pipe includes a first pipe and a second pipe. One end of the first pipe is connected to the exhaust port, and the other end is connected to a first gas flow channel. One end of the second pipe is connected to the exhaust port, and the other end is connected to a second gas flow channel. In this technical solution, the exhaust port and the cavity are connected by an external pipe. The first pipe connects to the first gas flow channel, replacing the third gas flow channel, and the second pipe connects to the second gas flow channel, replacing the fourth gas flow channel. This allows the high-pressure gas at the exhaust port to enter the corresponding gas flow channel through the external pipe, providing radial support to the male and female rotors. The external pipe structure is simple, requires minimal modification to the original device, and makes production and installation simpler and faster.

[0014] As an improvement, the outer diameter of the first adjusting block is the same as the inner wall aperture of the cavity, and the outer wall of the first adjusting block fits against the inner wall of the cavity. The high-pressure gas in the cavity flows through the first pipe to the first gas flow channel to provide radial support to the male rotor. In this technical solution, the first pipe is connected to the first gas flow channel to replace the third gas flow channel. The outer diameter of the first adjusting block is set to be the same as the inner wall aperture of the cavity, so that the outer wall of the first adjusting block can fit against the inner wall of the cavity. This allows the high-pressure gas discharged into the cavity through the first pipe to completely enter the first gas flow channel, thereby acting on the male rotor to provide radial support. The gas flow efficiency is high, the high-pressure gas loss is small, and the radial force on the male rotor can be better balanced.

[0015] As an improvement, the outer diameter of the second adjusting block is the same as the inner wall aperture of the cavity, and the outer wall of the second adjusting block fits against the inner wall of the cavity. The high-pressure gas in the cavity flows through the second pipe to the second gas flow channel to provide radial support to the female rotor. In this technical solution, the second pipe is connected to the second gas flow channel to replace the fourth gas flow channel. The outer diameter of the second adjusting block is set to be the same as the inner wall aperture of the cavity, so that the outer wall of the second adjusting block can fit against the inner wall of the cavity. This allows the high-pressure gas discharged into the cavity through the second pipe to completely enter the second gas flow channel, thereby acting on the female rotor to provide radial support. The gas flow efficiency is high, the high-pressure gas loss is small, and the radial force on the female rotor can be better balanced. Attached Figure Description

[0016] Figure 1 This is a three-dimensional structural diagram of Embodiment 1 of this disclosure.

[0017] Figure 2 This is a cross-sectional structural diagram of Embodiment 1 of this disclosure.

[0018] Figure 3 This is a cross-sectional view of Embodiment 1 of this disclosure from another direction.

[0019] Figure 4 This is a schematic diagram of the gas flow path in Embodiment 1 of this disclosure.

[0020] Figure 5 This is a three-dimensional structural diagram of the first adjusting block in this disclosure.

[0021] Figure 6 This is a three-dimensional structural diagram of the second adjusting block in this disclosure.

[0022] Figure 7 This is a three-dimensional structural diagram of the first sealing cap in this disclosure.

[0023] Figure 8 This is a three-dimensional structural diagram of the second sealing cap in this disclosure.

[0024] Figure 9 This is a front view schematic diagram of Embodiment 2 of this disclosure.

[0025] Figure 10 This is a cross-sectional schematic diagram of Embodiment 2 of this disclosure.

[0026] The figure shows: 1. Cylinder; 11. Male rotor; 12. Female rotor; 2. Inlet seat; 21. Inlet port; 3. Inlet end cover; 4. Exhaust seat; 41. Exhaust port; 42. Cavity; 421. Third gas flow channel; 422. Fourth gas flow channel; 5. Exhaust end cover; 61. First adjusting block; 611. First gas flow channel; 612. First mounting hole; 62. Second adjusting block; 621. Second gas flow channel; 622. Second mounting hole; 71. First sealing cover; 711. Third mounting hole; 72. Second sealing cover; 721. Fourth mounting hole; 8. Sealing assembly; 91. First pipe; 92. Second pipe. Detailed Implementation

[0027] To better understand this application, various aspects of this application will be described in more detail with reference to the accompanying drawings. It should be understood that these detailed descriptions are merely illustrative of exemplary embodiments of this application and are not intended to limit the scope of this application in any way. Throughout the specification, the same reference numerals refer to the same elements.

[0028] In the accompanying drawings, the thickness, size, and shape of the objects have been slightly exaggerated for illustrative purposes. The drawings are for illustrative purposes only and are not drawn to scale.

[0029] It should also be understood that the terms “comprising,” “including,” “having,” “containing,” “comprise,” and “containing”, when used in this specification, indicate the presence of the described features, integrals, steps, operations, elements, and / or components, but do not exclude the presence or addition of one or more other features, integrals, steps, operations, elements, components, and / or combinations thereof.

[0030] Example 1

[0031] like Figures 1 to 8 As shown, this embodiment discloses a screw compressor, including a cylinder 1, in which a male rotor 11 and a female rotor 12 are installed. An intake seat 2 is installed at the intake end of the cylinder 1, and the intake seat 2 has an intake port 21 communicating with the cylinder 1. An intake end cover 3 is connected to the end of the intake seat 2 away from the cylinder 1. An exhaust seat 4 is installed at the exhaust end of the cylinder 1, and the exhaust seat 4 has an exhaust port 41 communicating with the cylinder 1. An exhaust end cover 5 is connected to the end of the exhaust seat 4 away from the cylinder 1. During the operation of the compressor, gas is drawn into the cylinder 1 from the intake port 21, compressed into high-pressure gas, and then discharged from the exhaust port 41, thereby completing the process of intake, compression, and exhaust. The intake ends of the male rotor 11 and the female rotor 12 are installed in the intake seat 2, and the exhaust ends of the male rotor 11 and the female rotor 12 are installed in the exhaust seat 4. Both the exhaust ends of the male rotor 11 and the female rotor 12 are provided with sealing components 8 to prevent internal leakage of the compressor.

[0032] A cavity 42 is provided between the exhaust seat 4 near the cylinder 1 and the sealing assembly 8. This cavity 42 is connected to the exhaust port 41, allowing high-pressure gas from the exhaust port 41 to enter the cavity 42. A first adjusting block 61 and a second adjusting block 62 are installed in the cavity 42, both connected to the exhaust seat 4. The first adjusting block 61 and the second adjusting block 62 guide the high-pressure gas in the cavity 42. The first adjusting block 61 is sleeved with the male rotor 11 and has a first gas flow channel 611 along the radial direction. The high-pressure gas in the cavity 42 acts directly on the rotor shaft of the male rotor 11 along the first gas flow channel 611. Under the guidance of the first gas flow channel 611, the high-pressure gas acts in the opposite direction to the radial force, providing radial support to the male rotor 11. This balances the radial force on the male rotor 11. The second adjusting block 62 is sleeved with the female rotor 12. The second adjusting block 62 is provided with a second gas flow channel 621 along the radial direction. The high-pressure gas in the cavity 42 acts directly on the rotor shaft of the female rotor 12 along the second gas flow channel 621. Under the guidance of the second gas flow channel 621, the high-pressure gas acts in the opposite direction to the radial force. The high-pressure gas has a radial support effect on the female rotor 12, thereby balancing the radial force on the female rotor 12. This can prevent the male rotor 11 and female rotor 12 from shifting, and reduce the force on the components on the rotor shaft, extending the service life of bearings and other components. On the other hand, this technical solution directly introduces high-pressure gas into the cavity 42 from the exhaust port 41 to balance the radial force, without the need to add an external air pump or make any changes to the original system, making it simple and efficient.

[0033] More specifically, a first sealing cover 71 and a second sealing cover 72 are installed on the side of the exhaust seat 4 near the cylinder 1. The first sealing cover 71 is sleeved with the male rotor 11, and the second sealing cover 72 is sleeved with the female rotor 12. The first sealing cover 71 and the second sealing cover 72 cooperate to isolate the cylinder 1 and the cavity 42. By installing the first sealing cover 71 and the second sealing cover 72 on the exhaust seat 4, the first sealing cover 71 and the second sealing cover 72 can prevent the high-pressure gas in the cavity 42 from flowing to the cylinder 1, preventing internal leakage and making the use more reliable. On the other hand, the first sealing cover 71 is sleeved with the male rotor 11, and the surface of the first sealing cover 71 away from the cylinder 1 is in contact with the surface of the first adjusting block 61, so that the gas flows more efficiently along the first gas flow channel 611 and can better balance the radial force.

[0034] More specifically, such as Figure 3 and Figure 4As shown, the outer diameter of the first adjusting block 61 is smaller than the inner wall aperture of the cavity 42. When the first adjusting block 61 is installed in the cavity 42, there is a gap between the outer wall of the first adjusting block 61 and the inner wall of the cavity 42. This gap forms a third gas flow channel 421 for high-pressure gas to flow through. The third gas flow channel 421 is connected to the first gas flow channel 611. The third gas flow channel 421 and the first gas flow channel 611 form a built-in flow channel. The high-pressure gas at the exhaust port 41 enters the cavity 42. The high-pressure gas in the cavity 42 flows along the third gas flow channel 421 to the first gas flow channel 611 to provide radial support to the male rotor 11. The gas flow efficiency is high, the high-pressure gas loss is small, and the radial force on the male rotor 11 can be better balanced.

[0035] More specifically, such as Figure 3 and Figure 4 As shown, the outer diameter of the second adjusting block 62 is smaller than the inner wall aperture of the cavity 42. Therefore, when the second adjusting block 62 is installed in the cavity 42, there is a gap between the outer wall of the second adjusting block 62 and the inner wall of the cavity 42. This gap forms a fourth gas flow channel 422 for high-pressure gas to flow through. The fourth gas flow channel 422 is connected to the second gas flow channel 621. The fourth gas flow channel 422 and the second gas flow channel 621 form a built-in flow channel. The high-pressure gas at the exhaust port 41 enters the cavity 42. The high-pressure gas in the cavity 42 flows along the fourth gas flow channel 422 to the second gas flow channel 621 to provide radial support for the female rotor 12. The gas flow efficiency is high, the high-pressure gas loss is small, and the radial force on the female rotor 12 can be better balanced.

[0036] More specifically, such as Figure 3 , Figure 5 and Figure 6 As shown, the first adjusting block 61 is provided with a first mounting hole 612, through which a fastener passes to install the first adjusting block 61 onto the exhaust seat 4. The second adjusting block 62 is provided with a second mounting hole 622, through which a fastener passes to install the second adjusting block 62 onto the exhaust seat 4. By providing the first mounting hole 612 on the first adjusting block 61, the first adjusting block 61 is installed on the exhaust seat 4 and fixed to the exhaust seat 4 by passing a fastener through the first mounting hole 612, thus improving the installation stability of the first adjusting block 61. By providing the second mounting hole 622 on the second adjusting block 62, the second adjusting block 62 is installed on the exhaust seat 4 and fixed to the exhaust seat 4 by passing a fastener through the second mounting hole 622, thus improving the installation stability of the second adjusting block 62.

[0037] More specifically, such as Figure 7 and Figure 8As shown, the first sealing cover 71 is provided with a third mounting hole 711 corresponding to the first mounting hole 612. Fasteners pass through the third mounting hole 711 and the first mounting hole 612 in sequence to connect to the exhaust seat 4, so as to fix the first sealing cover 71 and the first adjusting block 61 on the exhaust seat 4. The second sealing cover 72 is provided with a fourth mounting hole 721 corresponding to the second mounting hole 622. Fasteners pass through the fourth mounting hole 721 and the second mounting hole 622 in sequence to connect to the exhaust seat 4, so as to fix the second sealing cover 72 and the second adjusting block 62 on the exhaust seat 4.

[0038] More specifically, such as Figure 3 and Figure 5 As shown, the first adjusting block 61 is provided with multiple first mounting holes 612, and the multiple first mounting holes 612 are distributed circumferentially. The first mounting holes 612 at different positions are connected to the exhaust seat 4, which will cause the first adjusting block 61 to have different mounting angles on the exhaust seat 4. That is, by changing the first mounting holes 612 connected to the exhaust seat 4, the first adjusting block 61 can change the mounting angle of the first adjusting block 61 on the exhaust seat 4, thereby changing the angle of the first gas flow channel 611 in the cavity 42. This allows the position of the first gas flow channel 611 in the cavity 42 to change circumferentially. The user can adjust the angle of the first adjusting block 61 as needed, so that the high-pressure gas in the first gas flow channel 611 can more accurately correspond to the radial force, and more flexibly control the direction of the high-pressure gas to balance the radial force, resulting in higher balancing efficiency.

[0039] More specifically, such as Figure 3 and Figure 6 As shown, the second adjusting block 62 is provided with multiple second mounting holes 622, and the multiple second mounting holes 622 are distributed circumferentially. The second mounting holes 622 at different positions are connected to the exhaust seat 4, which will cause the second adjusting block 62 to have different mounting angles on the exhaust seat 4. That is, by changing the second mounting holes 622 connected to the exhaust seat 4, the second adjusting block 62 can change the mounting angle of the second adjusting block 62 on the exhaust seat 4, thereby changing the angle of the second gas flow channel 621 in the cavity 42. This allows the position of the second gas flow channel 621 in the cavity 42 to change circumferentially. The user can adjust the angle of the second adjusting block 62 as needed, so that the high-pressure gas in the second gas flow channel 621 can more accurately correspond to the radial force, and more flexibly control the direction of the high-pressure gas to balance the radial force, resulting in higher balancing efficiency.

[0040] Example 2

[0041] like Figure 9 and Figure 10As shown, this embodiment discloses a screw compressor. Unlike the built-in gas flow channel of Embodiment 1, this embodiment provides a screw compressor with an external gas flow channel. It includes a cylinder 1, with a male rotor 11 and a female rotor 12 installed inside. An inlet seat 2 is installed at the inlet end of the cylinder 1, and the inlet seat 2 has an inlet port 21 communicating with the cylinder 1. An inlet end cover 3 is connected to the end of the inlet seat 2 away from the cylinder 1. An exhaust seat 4 is installed at the exhaust end of the cylinder 1, and the exhaust seat 4 has an exhaust port 41 communicating with the cylinder 1. An exhaust end cover 5 is connected to the end of the exhaust seat 4 away from the cylinder 1. During compressor operation, gas flows from the inlet port... 21 is drawn into cylinder 1 and compressed into high-pressure gas, then discharged from exhaust port 41, thus completing the intake, compression, and exhaust process. The intake ends of the male rotor 11 and female rotor 12 are installed in the intake seat 2, and the exhaust ends of the male rotor 11 and female rotor 12 are installed in the exhaust seat 4. Both the exhaust ends of the male rotor 11 and female rotor 12 are equipped with sealing components 8 to prevent internal leakage of the compressor. A cavity 42 is provided between the side of the exhaust seat 4 near cylinder 1 and the sealing component 8. The cavity 42 is connected to the exhaust port 41, allowing the high-pressure gas at the exhaust port 41 to enter the cavity 42. A first adjusting block is installed in the cavity 42. The first adjusting block 61 and the second adjusting block 62 guide the high-pressure gas in the cavity 42. The first adjusting block 61 is sleeved with the male rotor 11 and has a first gas flow channel 611 along the radial direction. The high-pressure gas in the cavity 42 acts directly on the rotor shaft of the male rotor 11 along the first gas flow channel 611. Under the guidance of the first gas flow channel 611, the high-pressure gas acts in the opposite direction to the radial force, thereby balancing the radial force on the male rotor 11. The second adjusting block 62 is sleeved with the female rotor 12 and has a second gas flow channel along the radial direction. 621, the high-pressure gas in cavity 42 acts directly on the rotor shaft of female rotor 12 along the second gas flow channel 621. Under the guidance of the second gas flow channel 621, the high-pressure gas acts in the opposite direction to the radial force, thereby balancing the radial force on female rotor 12. This can prevent the male rotor 11 and female rotor 12 from shifting, and reduce the force on the components on the rotor shaft, extending the service life of bearings and other components. On the other hand, this technical solution directly introduces high-pressure gas into cavity 42 from exhaust port 41 to balance the radial force, without the need for an external air pump or modification of the original system, making it simple and efficient.

[0042] More specifically, such as Figure 7 and Figure 8As shown, a first sealing cover 71 and a second sealing cover 72 are installed on the side of the cavity 42 near the cylinder 1. The first sealing cover 71 is sleeved with the male rotor 11, and the second sealing cover 72 is sleeved with the female rotor 12. The first sealing cover 71 and the second sealing cover 72 cooperate to isolate the cylinder 1 and the cavity 42. By installing the first sealing cover 71 and the second sealing cover 72 in the cavity 42, the first sealing cover 71 and the second sealing cover 72 can prevent the high-pressure gas in the cavity 42 from flowing to the cylinder 1, preventing internal leakage and making the use more reliable. On the other hand, the first sealing cover 71 is sleeved with the male rotor 11, and the surface of the first sealing cover 71 away from the cylinder 1 is in contact with the surface of the first adjusting block 61, so that the gas flows more efficiently along the first gas flow channel 611 and can better balance the radial force.

[0043] The difference from Example 1 is as follows: Figure 9 and Figure 10 As shown, the exhaust port 41 and the cavity 42 are connected by an external pipe, which includes a first pipe 91 and a second pipe 92. One end of the first pipe 91 is connected to the exhaust port 41, and the other end of the first pipe 91 is connected to the first gas flow channel 611. One end of the second pipe 92 is connected to the exhaust port 41, and the other end of the second pipe 92 is connected to the second gas flow channel 621. The exhaust port 41 and the cavity 42 are connected by an external pipe. The first pipe 91 is connected to the first gas flow channel 611 to replace the third gas flow channel 421, and the second pipe 92 is connected to the second gas flow channel 621 to replace the fourth gas flow channel 422. This allows the high-pressure gas at the exhaust port 41 to enter the corresponding gas flow channel through the external pipe and act on the male rotor 11 and the female rotor 12. The external pipe structure is simple, requires less modification to the original device, and makes production and installation simpler and faster.

[0044] Unlike Example 1, such as Figure 9 and Figure 10 As shown, the outer diameter of the first adjusting block 61 is the same as the inner wall aperture of the cavity 42, and the outer side wall of the first adjusting block 61 is in contact with the inner side wall of the cavity 42. The high-pressure gas in the cavity 42 flows through the first pipe 91 to the first gas flow channel 611 to provide radial support for the male rotor 11. The first pipe 91 is connected to the first gas flow channel 611 to replace the third gas flow channel 421. The outer diameter of the first adjusting block 61 is set to be the same as the inner wall aperture of the cavity 42 so that the outer side wall of the first adjusting block 61 can be in contact with the inner side wall of the cavity 42. This allows the high-pressure gas discharged into the cavity 42 through the first pipe 91 to completely enter the first gas flow channel 611, thereby acting on the male rotor 11 to provide radial support for the male rotor 11. The gas flow efficiency is high, the high-pressure gas loss is small, and the radial force on the male rotor 11 can be better balanced.

[0045] Unlike Example 1, such as Figure 9 and Figure 10 As shown, the outer diameter of the second adjusting block 62 is the same as the inner wall aperture of the cavity 42, and the outer side wall of the second adjusting block 62 is in contact with the inner side wall of the cavity 42. The high-pressure gas in the cavity 42 flows through the second pipe 92 to the second gas flow channel 621 to provide radial support for the female rotor 12. The second pipe 92 is connected to the second gas flow channel 621 to replace the fourth gas flow channel 422. The outer diameter of the second adjusting block 62 is set to be the same as the inner wall aperture of the cavity 42 so that the outer side wall of the second adjusting block 62 can be in contact with the inner side wall of the cavity 42. This allows the high-pressure gas discharged into the cavity 42 through the second pipe 92 to completely enter the second gas flow channel 621, thereby acting on the female rotor 12 to provide radial support for the female rotor 12. The gas flow efficiency is high, the high-pressure gas loss is small, and the radial force on the female rotor 12 can be better balanced.

[0046] like Figure 5 , Figure 6 and Figure 9 As shown, the first adjusting block 61 is provided with a first mounting hole 612, through which a fastener passes to install the first adjusting block 61 onto the exhaust seat 4. The second adjusting block 62 is provided with a second mounting hole 622, through which a fastener passes to install the second adjusting block 62 onto the exhaust seat 4. By providing the first mounting hole 612 on the first adjusting block 61, the first adjusting block 61 is installed on the exhaust seat 4 and fixed to the exhaust seat 4 by passing a fastener through the first mounting hole 612, thus improving the installation stability of the first adjusting block 61. By providing the second mounting hole 622 on the second adjusting block 62, the second adjusting block 62 is installed on the exhaust seat 4 and fixed to the exhaust seat 4 by passing a fastener through the second mounting hole 622, thus improving the installation stability of the second adjusting block 62.

[0047] More specifically, such as Figure 5 and Figure 9 As shown, the first adjusting block 61 is provided with multiple first mounting holes 612, and the multiple first mounting holes 612 are distributed circumferentially. The first mounting holes 612 at different positions are connected to the exhaust seat 4, which will cause the first adjusting block 61 to have different mounting angles on the exhaust seat 4. That is, by changing the first mounting holes 612 connected to the exhaust seat 4, the first adjusting block 61 can change the mounting angle of the first adjusting block 61 on the exhaust seat 4, thereby changing the angle of the first gas flow channel 611 in the cavity 42. This allows the position of the first gas flow channel 611 in the cavity 42 to change circumferentially. The user can adjust the angle of the first adjusting block 61 as needed, so that the high-pressure gas in the first gas flow channel 611 can more accurately correspond to the radial force, and more flexibly control the direction of the high-pressure gas to balance the radial force, resulting in higher balancing efficiency.

[0048] More specifically, such as Figure 6 and Figure 9 As shown, the second adjusting block 62 is provided with multiple second mounting holes 622, and the multiple second mounting holes 622 are distributed circumferentially. The second mounting holes 622 at different positions are connected to the exhaust seat 4, which will cause the second adjusting block 62 to have different mounting angles on the exhaust seat 4. That is, by changing the second mounting holes 622 connected to the exhaust seat 4, the second adjusting block 62 can change the mounting angle of the second adjusting block 62 on the exhaust seat 4, thereby changing the angle of the second gas flow channel 621 in the cavity 42. This allows the position of the second gas flow channel 621 in the cavity 42 to change circumferentially. The user can adjust the angle of the second adjusting block 62 as needed, so that the high-pressure gas in the second gas flow channel 621 can more accurately correspond to the radial force, and more flexibly control the direction of the high-pressure gas to balance the radial force, resulting in higher balancing efficiency.

[0049] This invention is not limited to the preferred embodiments described above. Anyone can derive other products in various forms under the guidance of this invention. However, regardless of any changes in shape or structure, any technical solution that is the same as or similar to this application falls within the protection scope of this invention.

Claims

1. A screw compressor, comprising a cylinder (1), wherein a male rotor (11) and a female rotor (12) are installed inside the cylinder (1), an exhaust seat (4) is installed at the exhaust end of the cylinder (1), the exhaust seat (4) is provided with an exhaust port (41) communicating with the cylinder (1), an exhaust end cover (5) is connected to the end of the exhaust seat (4) away from the cylinder (1), and a sealing assembly (8) is provided at the exhaust ends of both the male rotor (11) and the female rotor (12), characterized in that, A cavity (42) is provided between the side of the exhaust seat (4) near the cylinder (1) and the sealing assembly (8). The cavity (42) is connected to the exhaust port (41). A first adjusting block (61) and a second adjusting block (62) are installed in the cavity (42). Both the first adjusting block (61) and the second adjusting block (62) are connected to the exhaust seat (4). The first adjusting block (61) is sleeved with the male rotor (11) and has a first gas flow channel (611) in the radial direction. The second adjusting block (62) is sleeved with the female rotor (12) and has a second gas flow channel (611) in the radial direction. The high-pressure gas at the exhaust port (41) enters the cavity (42) through the flow channel (621) and provides radial support to the male rotor (11) through the first gas flow channel (611) and radial support to the female rotor (12) through the second gas flow channel (621). The exhaust seat (4) is equipped with a first sealing cover (71) and a second sealing cover (72) on the side near the cylinder (1). The first sealing cover (71) is sleeved with the male rotor (11) and the second sealing cover (72) is sleeved with the female rotor (12). The first sealing cover (71) and the second sealing cover (72) cooperate to block the cylinder (1) and the cavity (42).

2. A screw compressor according to claim 1, characterized in that, The outer diameter of the first adjusting block (61) is smaller than the inner wall aperture of the cavity (42). There is a gap between the outer wall of the first adjusting block (61) and the inner wall of the cavity (42). This gap forms a third gas flow channel (421). The third gas flow channel (421) is connected to the first gas flow channel (611). The high-pressure gas in the cavity (42) flows through the third gas flow channel (421) to the first gas flow channel (611) to provide radial support to the male rotor (11).

3. A screw compressor according to claim 1, characterized in that, The outer diameter of the second adjusting block (62) is smaller than the inner wall aperture of the cavity (42). There is a gap between the outer wall of the second adjusting block (62) and the inner wall of the cavity (42). This gap forms a fourth gas flow channel (422). The fourth gas flow channel (422) is connected to the second gas flow channel (621). The high-pressure gas in the cavity (42) flows through the fourth gas flow channel (422) to the second gas flow channel (621) to provide radial support to the female rotor (12).

4. A screw compressor according to claim 1, characterized in that, The first adjusting block (61) is provided with a first mounting hole (612), and the first adjusting block (61) is mounted on the exhaust seat (4) by fasteners through the first mounting hole (612). The second adjusting block (62) is provided with a second mounting hole (622), and the second adjusting block (62) is mounted on the exhaust seat (4) by fasteners through the second mounting hole (622).

5. A screw compressor according to claim 4, characterized in that, The first mounting hole (612) is provided in multiple circumferential directions. The first adjusting block (61) is connected to the exhaust seat (4) through the first mounting hole (612) at different positions to change the mounting angle, thereby changing the angle of the first gas flow channel (611) in the cavity (42).

6. A screw compressor according to claim 4, characterized in that, The second mounting hole (622) is provided in multiple circumferential directions. The second adjusting block (62) is connected to the exhaust seat (4) through the second mounting hole (622) at different positions to change the mounting angle, thereby changing the angle of the second gas flow channel (621) in the cavity (42).

7. A screw compressor according to claim 1, characterized in that, The exhaust port (41) and the cavity (42) are connected by an external pipe. The pipe includes a first pipe (91) and a second pipe (92). One end of the first pipe (91) is connected to the exhaust port (41), and the other end of the first pipe (91) is connected to the first gas flow channel (611). One end of the second pipe (92) is connected to the exhaust port (41), and the other end of the second pipe (92) is connected to the second gas flow channel (621).

8. A screw compressor according to claim 7, characterized in that, The outer diameter of the first adjusting block (61) is the same as the inner wall diameter of the cavity (42). The outer side wall of the first adjusting block (61) is in contact with the inner side wall of the cavity (42). The high-pressure gas in the cavity (42) flows through the first pipe (91) to the first gas flow channel (611) to provide radial support to the male rotor (11).

9. A screw compressor according to claim 7, characterized in that, The outer diameter of the second adjusting block (62) is the same as the inner wall diameter of the cavity (42). The outer wall of the second adjusting block (62) is in contact with the inner wall of the cavity (42). The high-pressure gas in the cavity (42) flows through the second pipe (92) to the second gas flow channel (621) to provide radial support to the female rotor (12).

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