Three-stage compression screw main engine with slide valve structure

Abstract

The disclosure provides a three-stage compression screw main machine with a slide valve structure, which comprises a first-stage screw rotor group, a second-stage screw rotor group, a third-stage screw rotor group and an output shaft (17) connected with a power assembly, the first-stage screw rotor group, the second-stage screw rotor group and the third-stage screw rotor group are sequentially communicated along a compression direction, a cavity where the third-stage screw rotor group is located is provided with a radial discharge port (10), and a content volume ratio adjusting slide valve (13) is arranged at the radial discharge port (10), and the flow passage cross section of the radial discharge port (10) is adjusted through the content volume ratio adjusting slide valve (13). The disclosure adjusts the internal pressure ratio of the three-stage compression screw main machine, so that the exhaust pressure matched with the use pressure is achieved, thereby solving the energy consumption problem, and in addition, the noise and vibration of the main machine can be reduced.

Description

Technical Field

[0001] This invention relates to the field of screw compressor technology, specifically a three-stage screw compressor main unit with a slide valve structure. Background Technology

[0002] Screw compressors are important general-purpose industrial equipment. Their core components include the screw compressor. The screw compressor has evolved from single-stage compression to the current three-stage compression. With the increase in the number of compression stages, how to achieve more efficient operation is of great research significance.

[0003] The applicant's research found that, for three-stage compressor screw compressors, the exhaust pressure often changes during actual use, resulting in over-compression or under-compression. Energy consumption is more significant in medium- and high-pressure environments of 2.5 to 4.0 MPa. The characteristic of three-stage compressor screw compressors is to provide medium- and high-pressure conditions.

[0004] Therefore, the applicant proposes a three-stage compressor screw compressor with a slide valve structure. By adjusting the internal pressure ratio of the three-stage compressor screw compressor, the exhaust pressure can be matched with the operating pressure to solve the energy consumption problem. In addition, it can also help reduce the noise and vibration of the compressor. Summary of the Invention

[0005] The technical problem to be solved by the present invention is to overcome the defects of the prior art and propose a three-stage compression screw compressor with a slide valve structure. By adjusting the internal pressure ratio of the three-stage compression screw compressor, the exhaust pressure can be matched with the operating pressure to solve the energy consumption problem. In addition, it can also help reduce the noise and vibration of the compressor.

[0006] Compared with the prior art, the present invention proposes a three-stage screw compressor main unit with a slide valve structure, including a first-stage screw rotor assembly, a second-stage screw rotor assembly, a third-stage screw rotor assembly, and an output shaft connected to a power component. The first-stage screw rotor assembly, the second-stage screw rotor assembly, and the third-stage screw rotor assembly are sequentially connected along the compression direction. The cavity where the third-stage screw rotor assembly is located has a radial outlet, and an internal volume ratio adjusting slide valve is provided at the radial outlet. The flow cross section of the radial outlet is adjusted by the internal volume ratio adjusting slide valve.

[0007] Compared with the prior art, the present invention has the following advantages after adopting the above structure:

[0008] During operation, a mismatch may occur between the final pressure and the exhaust pressure of a three-stage screw compressor, causing the compressor to perform excessive work, affecting its performance, and resulting in excessive noise and vibration. This disclosure provides a volume ratio adjustment valve at the radial discharge port. By adjusting the flow cross-section of the radial discharge port through the volume ratio adjustment valve, the size of the radial discharge port of the three-stage compression chamber can be adjusted by sliding it left and right, thereby changing its volume ratio and matching the final pressure with the exhaust pressure. This reduces energy consumption and also helps to reduce the noise and vibration of the compressor.

[0009] As an improvement, a gearbox is also included. A three-stage screw rotor assembly is set on the left side of the gearbox, and the three-stage screw rotor assembly is located on the left side of the gearbox with a three-stage air intake port. A two-stage screw rotor assembly is set on the right side of the gearbox, and the two-stage screw rotor assembly is located on the right side of the gearbox with a two-stage air outlet port. The compressed gas after being compressed by the two-stage screw rotor assembly directly passes through the gearbox and enters the three-stage screw rotor assembly.

[0010] As an improvement, the output shaft and the three-stage screw rotor assembly are arranged side by side on the left side of the gearbox, and the first-stage screw rotor assembly and the second-stage screw rotor assembly are arranged side by side on the right side of the gearbox. The gearbox contains a driving gear, a first-stage driven gear that drives the first-stage male rotor shaft of the first-stage screw rotor assembly, a second-stage driven gear that drives the second-stage male rotor shaft of the second-stage screw rotor assembly, and a third-stage driven gear that drives the third-stage male rotor shaft of the third-stage screw rotor assembly. The first-stage driven gear, the second-stage driven gear, and the third-stage driven gear are arranged circumferentially along the driving gear and mesh with the driving gear respectively. The driving gear is connected to the output shaft, and the output shaft drives the first-stage driven gear, the second-stage driven gear, and the third-stage driven gear to rotate simultaneously through the driving gear.

[0011] As an improvement, the first-stage driven gear is sleeved on the left end of the first-stage male rotor shaft, and the first-stage driven gear directly drives the first-stage male rotor shaft to rotate synchronously. The second-stage driven gear is sleeved on the left end of the second-stage male rotor shaft, and the second-stage driven gear directly drives the second-stage male rotor shaft to rotate synchronously. The third-stage driven gear is sleeved on the right end of the third-stage male rotor shaft, and the third-stage driven gear directly drives the third-stage male rotor shaft to rotate synchronously.

[0012] As an improvement, a primary intake port is provided on the upper side of the primary screw rotor assembly, and a primary and secondary interval is provided between the primary screw rotor assembly and the secondary screw rotor assembly. The primary and secondary interval is provided with a through hole that runs vertically through the primary screw rotor assembly. The upper end of the through hole serves as the primary exhaust port of the primary screw rotor assembly, and the lower end of the through hole serves as the secondary intake port of the secondary screw rotor assembly.

[0013] As an improvement, the primary screw rotor assembly and the secondary screw rotor assembly are symmetrically arranged about the same vertical plane.

[0014] As an improvement, both the primary and secondary air intake ports are located far from the gearbox, while both the primary and secondary air outlets are located close to the gearbox.

[0015] As an improvement, the two-stage screw rotor assembly and the three-stage screw rotor assembly are horizontally distributed.

[0016] As an improvement, the outer diameter of the first-stage male rotor of the first-stage screw rotor group is greater than that of the second-stage male rotor of the second-stage screw rotor group, which is greater than that of the third-stage male rotor of the third-stage screw rotor group. The effective length of the first-stage male rotor is greater than that of the second-stage male rotor, which is greater than that of the third-stage male rotor. Attached Figure Description

[0017] Figure 1 This is a right view of a three-stage screw compressor main unit with a slide valve structure.

[0018] Figure 2 This is a sectional view along axis AA.

[0019] Explanation of reference numerals in the attached diagram: 1. Driving gear; 2. First-stage driven gear; 3. Second-stage driven gear; 4. Third-stage driven gear; 5. First-stage male rotor shaft; 6. Second-stage male rotor shaft; 7. Third-stage male rotor shaft; 8. Gearbox; 9. First-stage intake port; 10. Radial exhaust port; 11. First-stage exhaust port; 12. Second-stage intake port; 13. Internal volume ratio adjusting slide valve; 14. Second-stage exhaust port; 15. Third-stage intake port; 16. Vertical plane; 17. Output shaft; 18. Second-stage female rotor. Detailed Implementation

[0020] The following description is intended to disclose the present invention and enable those skilled in the art to implement it. The embodiments described below are merely examples, and other obvious variations will arise for those skilled in the art. The basic principles of the invention defined in the following description can be applied to other embodiments, modifications, improvements, equivalents, and other technical solutions that do not depart from the spirit and scope of the invention.

[0021] The present invention will now be described in further detail:

[0022] For ease of description and understanding, directional descriptions are used for illustrative purposes only and do not constitute a limitation on the scope of rights protection. The following left and right directional descriptions are based on... Figure 2 direction shown.

[0023] like Figure 1 , 2As shown, the three-stage screw compressor main unit with a slide valve structure proposed in this disclosure includes a first-stage screw rotor assembly, a second-stage screw rotor assembly, a third-stage screw rotor assembly, and an output shaft 17 connected to a power assembly. The first-stage screw rotor assembly, the second-stage screw rotor assembly, and the third-stage screw rotor assembly are sequentially connected along the compression direction. The cavity where the third-stage screw rotor assembly is located is provided with a radial outlet 10. An internal volume ratio adjusting slide valve 13 is provided at the radial outlet 10, and the flow cross section of the radial outlet 10 is adjusted by the internal volume ratio adjusting slide valve 13.

[0024] The slider of the volume ratio regulating slide valve 13 can be implemented by a linear telescopic mechanism, such as a pneumatic cylinder, hydraulic cylinder, or electric cylinder. The volume ratio regulating slide valve 13 can be infinitely adjusted within the range of fully open and minimally closed, which is beneficial for obtaining a better volume ratio and making the final pressure more matched with the exhaust pressure.

[0025] In some embodiments, such as Figure 2 As shown, the system also includes a gearbox 8. A three-stage screw rotor assembly is located on the left side of the gearbox 8, with a three-stage intake port 15 on the left side. A two-stage screw rotor assembly is located on the right side of the gearbox 8, with a two-stage exhaust port 14 on the right side. The compressed gas from the two-stage screw rotor assembly passes directly through the gearbox 8 into the three-stage screw rotor assembly. This shortens the main unit length and significantly reduces the airflow paths of the second and third stages. Changes in the internal volume ratio adjustment valve 13 allow for rapid adjustment of the internal volume ratio, resulting in good responsiveness. A through-hole can be provided in the gearbox 8, connecting the two-stage exhaust port 14 and the three-stage intake port 15.

[0026] In this example, the output shaft 17 and the three-stage screw rotor assembly are arranged side by side on the left side of the gearbox 8, and the first-stage screw rotor assembly and the second-stage screw rotor assembly are arranged side by side on the right side of the gearbox 8. The gearbox 8 is equipped with a driving gear 1, a first-stage driven gear 2 that drives the first-stage male rotor shaft 5 of the first-stage screw rotor assembly, a second-stage driven gear 3 that drives the second-stage male rotor shaft 6 of the second-stage screw rotor assembly, and a third-stage driven gear 4 that drives the third-stage male rotor shaft 7 of the third-stage screw rotor assembly. The first-stage driven gear 2, the second-stage driven gear 3, and the third-stage driven gear 4 are arranged circumferentially along the driving gear 1 and mesh with the driving gear 1 respectively. The driving gear 1 is connected to the output shaft 17, and the output shaft 17 drives the first-stage driven gear 2, the second-stage driven gear 3, and the third-stage driven gear 4 to rotate simultaneously through the driving gear 1.

[0027] In this way, the centrally located design of this disclosure enables the output shaft 17 to drive the first-stage driven gear 2, the second-stage driven gear 3, and the third-stage driven gear 4 to rotate simultaneously through the driving gear 1, which significantly shortens the transmission path and is conducive to improving efficiency. Based on the aforementioned design, the output shaft and the third-stage screw rotor assembly are arranged side by side on the left side of the gearbox 8, and the first-stage screw rotor assembly and the second-stage screw rotor assembly are arranged side by side on the right side of the gearbox, which is conducive to shortening the overall length and thus reducing the volume.

[0028] Because the transmission path is shortened and the volume is reduced, the overall operating noise and vibration of the three-stage compressor screw compressor are reduced. The reduction of parts and sealing surfaces in the three-stage compressor screw compressor helps to reduce leakage points and increase stability.

[0029] In this example, to make the transmission more efficient and direct, such as Figure 2 As shown, the first-stage driven gear 2 is sleeved on the left end of the first-stage male rotor shaft 5, directly driving the first-stage male rotor shaft 5 to rotate synchronously. The second-stage driven gear 3 is sleeved on the left end of the second-stage male rotor shaft 6, directly driving the second-stage male rotor shaft 6 to rotate synchronously. The third-stage driven gear 4 is sleeved on the right end of the third-stage male rotor shaft 7, directly driving the third-stage male rotor shaft 7 to rotate synchronously. In this way, each stage is driven by the male rotor to drive the female rotor.

[0030] like Figure 2 As shown, the output shaft 17 and the three-stage screw rotor assembly are arranged vertically, as are the first-stage and second-stage screw rotor assemblies. A first-stage intake port 9 is located on the upper side of the first-stage screw rotor assembly. A first-stage and second-stage interval is provided between the first-stage and second-stage screw rotor assemblies, with a through hole running vertically through the interval. The upper end of the through hole serves as the first-stage exhaust port 11 of the first-stage screw rotor assembly, and the lower end serves as the second-stage intake port 12 of the second-stage screw rotor assembly. This results in a shorter flow path. To further shorten the path, the third-stage intake port 15 is positioned close to the gearbox 8.

[0031] For a more compact structure, such as Figure 1 , 2 As shown, the first-stage and second-stage screw rotor assemblies are arranged vertically and are both located on the right side of gearbox 8, while the second-stage and third-stage screw rotor assemblies are horizontally distributed and located on the left and right sides of gearbox 8. Among these, as... Figure 2 As shown, the outer diameter of the first-stage male rotor of the first-stage screw rotor assembly is greater than that of the second-stage male rotor of the second-stage screw rotor assembly, which is greater than that of the third-stage male rotor of the third-stage screw rotor assembly. The effective length of the first-stage male rotor is greater than that of the second-stage male rotor, which is greater than that of the third-stage male rotor.

[0032] It should be noted that in this example, such as Figure 1As shown, the primary screw rotor assembly and the secondary screw rotor assembly are symmetrically arranged about the same vertical plane 16. That is, the male and female rotors of the primary screw rotor assembly and the secondary screw rotor assembly are both symmetrically arranged about this vertical plane 16. This makes the overall arrangement structure more regular and also facilitates placing the center of gravity close to the vertical plane 16.

[0033] In some embodiments, such as Figure 2 As shown, the primary intake port 9 and the secondary intake port 12 are both located far from the gearbox 8, while the primary exhaust port 11 and the secondary exhaust port 14 are both located close to the gearbox 8. This arrangement is beneficial for the arrangement of each stage and also results in shorter airflow paths for the second and third stages.

[0034] In order to better balance the force load on the drive gear 1, such as Figure 1 and combined Figure 2 As shown, the first-stage driven gear 2, the second-stage driven gear 3, and the third-stage driven gear 4 are arranged in a counterclockwise direction around the driving gear 1.

[0035] To further optimize the load, the second-stage driven gear 3 and the third-stage driven gear 4 are located below the first-stage driven gear 2.

[0036] To make the structure more compact, thereby reducing the volume, such as Figure 1 As shown, the secondary female rotor 18 of the secondary screw rotor assembly overlaps with the tertiary driven gear 4, and as... Figure 2 As shown, the left shaft end of the secondary female rotor 18 is recessed to the right, thereby providing suitable space for the tertiary male rotor shaft 7 to be installed to the right and connected to the tertiary driven gear 4.

[0037] Although the above example illustrates how the first-stage driven gear 2 directly drives the first-stage male rotor shaft 5 to rotate synchronously, the second-stage driven gear 3 directly drives the second-stage male rotor shaft 6 to rotate synchronously, and the third-stage driven gear 4 directly drives the third-stage male rotor shaft 7 to rotate synchronously, it could also be that the corresponding driven gear drives the corresponding female rotor shaft, or a combination of the corresponding male rotor shaft and the corresponding female rotor shaft.

[0038] Power components such as electric motors.

[0039] The gearbox 8 disclosed herein can be set independently.

[0040] However, it is worth noting that the gearbox 8 can be formed by splicing together the left and right pump bodies, with the left pump body used to install the three-stage screw rotor assembly and the right pump body used to install the first-stage screw rotor assembly and the second-stage screw rotor assembly. The centrally located design increases the difficulty of assembly. However, the gearbox 8, formed by splicing the left and right pump bodies, helps to reduce the assembly difficulty. Specifically, before splicing, the three-stage screw rotor assembly is installed on the left pump body, and the output shaft 17, the driving gear 1, and the three-stage driven gear 4 are connected to form the left component. The assembly process is easier and more precise when the assembly is in the open state. The first-stage screw rotor assembly and the second-stage screw rotor assembly are installed on the right pump body, and the first-stage driven gear 2 and the second-stage driven gear 3 are connected to form the right component. Similarly, the assembly process is easier and more precise when the assembly is in the open state. After obtaining the left and right components, the rotational positions of the driving gear 1, the first-stage driven gear 2, and the second-stage driven gear 3 are adjusted, and then the left and right components are spliced ​​together to complete the gearbox 8 and ensure a good assembly of the internal components. The meshing accuracy of the male and female rotors in the first-stage screw rotor assembly, the second-stage screw rotor assembly, and the third-stage screw rotor assembly is also better guaranteed, without the need for excessive readjustment.

[0041] Since the third-stage driven gear 4 has already been fully engaged with the driving gear 1 when the left-side component is formed, the third-stage driven gear 4 can rotate with the driving gear 1, and there is no need to adjust the third-stage driven gear 4 separately when splicing the left and right sides.

[0042] When understanding this invention, the above structure may be referred to other embodiments / appendices if necessary. Figure 1 And that's understood, so I won't go into details here.

[0043] The above description is merely an illustrative embodiment of the present invention. Therefore, all equivalent changes or modifications made to the structure, features, and principles described in the scope of protection of the present invention are included within the scope of protection of the present invention.

Claims

1. A three-stage screw compressor main unit with a slide valve structure, comprising a primary screw rotor assembly, a secondary screw rotor assembly, a tertiary screw rotor assembly, and an output shaft (17) connected to a power assembly, wherein the primary screw rotor assembly, the secondary screw rotor assembly, and the tertiary screw rotor assembly are sequentially connected along the compression direction, characterized in that, The cavity containing the three-stage screw rotor assembly is provided with a radial outlet (10), and an internal volume ratio regulating slide valve (13) is provided at the radial outlet (10). The flow cross section of the radial outlet (10) is adjusted by the internal volume ratio regulating slide valve (13). It also includes a gearbox (8), a three-stage screw rotor assembly is provided on the left side of the gearbox (8), and a three-stage air intake (15) is provided on the left side of the gearbox (8). A two-stage screw rotor assembly is provided on the right side of the gearbox (8), and a two-stage air outlet (14) is provided on the right side of the gearbox (8). The compressed gas after being compressed by the two-stage screw rotor assembly directly passes through the gearbox (8) and enters the three-stage screw rotor assembly. While shortening the length of the main unit, the airflow path of the second and third stages is also shortened. A through hole is opened in the gearbox (8), which connects the two-stage air outlet (14) and the three-stage air intake (15). The output shaft (17) and the three-stage screw rotor assembly are arranged side by side on the left side of the gearbox (8). The first-stage screw rotor assembly and the second-stage screw rotor assembly are arranged side by side on the right side of the gearbox (8). The gearbox (8) is equipped with a driving gear (1), a first-stage driven gear (2) that drives the first-stage male rotor shaft (5) of the first-stage screw rotor assembly, a second-stage driven gear (3) that drives the second-stage male rotor shaft (6) of the second-stage screw rotor assembly, and a third-stage driven gear (4) that drives the third-stage male rotor shaft (7) of the third-stage screw rotor assembly. The first-stage driven gear (2), the second-stage driven gear (3), and the third-stage driven gear (4) are arranged circumferentially along the driving gear (1) and mesh with the driving gear (1) respectively. The driving gear (1) is connected to the output shaft (17). The output shaft (17) drives the first-stage driven gear (2), the second-stage driven gear (3), and the third-stage driven gear (4) to rotate simultaneously through the driving gear (1).

2. The three-stage compression screw compressor with a slide valve structure according to claim 1, characterized in that, The first-stage driven gear (2) is sleeved on the left end of the first-stage male rotor shaft (5), and the first-stage driven gear (2) directly drives the first-stage male rotor shaft (5) to rotate synchronously. The second-stage driven gear (3) is sleeved on the left end of the second-stage male rotor shaft (6), and the second-stage driven gear (3) directly drives the second-stage male rotor shaft (6) to rotate synchronously. The third-stage driven gear (4) is sleeved on the right end of the third-stage male rotor shaft (7), and the third-stage driven gear (4) directly drives the third-stage male rotor shaft (7) to rotate synchronously.

3. A three-stage compression screw compressor with a slide valve structure according to claim 1, characterized in that, A primary intake port (9) is provided on the upper side of the primary screw rotor assembly. A primary and secondary interval is provided between the primary screw rotor assembly and the secondary screw rotor assembly. The primary and secondary interval is provided with a through hole that runs vertically through the upper and lower parts. The upper end of the through hole serves as the primary exhaust port (11) of the primary screw rotor assembly, and the lower end of the through hole serves as the secondary intake port (12) of the secondary screw rotor assembly.

4. A three-stage compression screw compressor with a slide valve structure according to claim 3, characterized in that, The primary screw rotor assembly and the secondary screw rotor assembly are symmetrically arranged about the same vertical plane (16).

5. A three-stage compression screw compressor with a slide valve structure according to claim 3, characterized in that, The primary air intake (9) and the secondary air intake (12) are both located far away from the gearbox (8), while the primary air outlet (11) and the secondary air outlet (14) are both located close to the gearbox (8).

6. A three-stage compression screw compressor with a slide valve structure according to claim 1, characterized in that, The two-stage screw rotor assembly and the three-stage screw rotor assembly are horizontally distributed.

7. A three-stage compression screw compressor with a slide valve structure according to claim 1, characterized in that, The outer diameter of the first-stage male rotor of the first-stage screw rotor assembly is greater than that of the second-stage male rotor of the second-stage screw rotor assembly, which is greater than that of the third-stage male rotor of the third-stage screw rotor assembly. The effective length of the first-stage male rotor is greater than that of the second-stage male rotor, which is greater than that of the third-stage male rotor.

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