Screw and vortex two-stage compression main machine

Abstract

The utility model discloses a screw and vortex two-stage compression main machine, and belongs to the technical field of compressors, the screw and vortex two-stage compression main machine comprises a first-stage screw compressor and a second-stage vortex compressor, the first-stage screw compressor and the second-stage vortex compressor are horizontally arranged in series, a first-stage male screw and a first-stage female screw which are meshed with each other are installed in the first-stage screw compressor, and a second-stage male screw and a second-stage female screw are installed in the second-stage vortex compressor. A second-stage static scroll plate and a second-stage dynamic scroll plate which are meshed with each other are mounted in the second-stage scroll compressor, a first static scroll wrap and a second static scroll wrap are arranged on the second-stage static scroll plate, and a first dynamic scroll wrap and a second dynamic scroll wrap are arranged on the second-stage dynamic scroll plate; the second-stage static vortex plate and the second-stage dynamic vortex plate of the compression main machine are both of a double-vortex-tooth structure, so that the compression main machine can increase exhaust, reduce the compression ratio, reduce the overall dimension of the whole machine and the like.

Description

Technical Field

[0001] The present application relates to the technical field of compressors, and more specifically to a two-stage screw and scroll compression main engine. Background Art

[0002] Currently in the compressor market, screw compressors and scroll compressors are both independently designed. The working principle of a screw compressor is that it has a pair of mutually meshing yin and yang rotors, and the compression purpose is achieved through the movement of the yin and yang rotors; the working principle of a scroll compressor is that it has a pair of mutually meshing scrolls, the moving one is called the moving scroll, and the stationary one is called the static scroll, and the moving scroll moves relative to the static scroll to achieve the compression purpose; for small-displacement screw compressors, there are poor volumetric efficiency and poor energy efficiency values ​​under normal pressure or medium and high pressure working conditions; for scroll compressors under large-displacement working conditions, there are large volumes and non-compact structures, and unsatisfactory energy efficiency values, but they are more efficient under small displacement.

[0003] In view of the above-mentioned problems, a utility model with publication number: CN217558545U discloses a screw scroll two-stage compressor with adjustable inter-stage exhaust volume and pressure, the structure includes a first-stage screw compressor and a second-stage scroll compressor, the first-stage screw compressor and the second-stage scroll compressor are arranged in series horizontally; the first-stage screw compressor includes a first-stage screw compression chamber, a male rotor and a female rotor meshing with each other arranged in the first-stage screw compression chamber, the second-stage scroll compressor includes a second-stage scroll chamber, a movable scroll and a stationary scroll located in the second-stage scroll chamber; the final extension angle of the central plane of the vortex circle corresponding to the movable scroll and the stationary scroll respectively is adjustable or the height of the corresponding vortex circle is adjustable; this technical solution combines the screw compressor and the scroll compressor The advantages of each machine are combined and their respective defects can be overcome, thereby improving the exhaust pressure, volumetric efficiency, energy efficiency value and performance of small-displacement compressors. However, the movable scroll and the static scroll in this scheme both adopt a single vortex, that is, the movable scroll and the static scroll are both single-vortex tooth structures, and the single-vortex tooth structure has the problem of low exhaust volume. If the main engine exhaust pressure of 0.8Mpa is to be met, since the compression medium is air, after the first stage of compression, the second-stage compression ratio is too low, and the single scroll tooth cannot meet the conditions, resulting in high main engine power, high exhaust temperature, poor efficiency and other problems. If a single-vortex tooth compressor wants to increase the exhaust volume, it is mostly by increasing the scroll diameter and height, which leads to an increase in the overall size of the compressor, and the compression ratio of the single-vortex tooth compressor is also high. Utility Model Content

[0004] The technical problem to be solved by the present application is to provide a screw and scroll two-stage compression main unit, in which the secondary static scroll and the secondary movable scroll of the compression main unit both adopt a double scroll tooth structure, which is beneficial for the compression main unit to increase exhaust, reduce compression ratio, and reduce the overall size of the machine.

[0005] The present application provides a screw and scroll two-stage compression main engine, including a first-stage screw compressor and a second-stage scroll compressor, wherein the first-stage screw compressor and the second-stage scroll compressor are arranged in series horizontally, wherein the first-stage screw compressor is provided with a first-stage male screw and a first-stage female screw that mesh with each other, wherein the second-stage scroll compressor is provided with a second-stage static scroll and a second-stage movable scroll that mesh with each other, wherein the second-stage static scroll is provided with a first static scroll tooth and a second static scroll tooth, wherein the second-stage movable scroll is provided with a first movable scroll tooth and a second movable scroll tooth.

[0006] In the present technical scheme, a first-stage screw compressor and a second-stage scroll compressor are horizontally arranged in series to form a screw and scroll two-stage compression main unit, the respective advantages of the screw compressor and the scroll compressor are combined and their respective defects are overcome, and a second-stage scroll compressor is arranged to operate through the mutual meshing of a second-stage static scroll and a second-stage movable scroll to achieve a second-stage compression. Compared with the ordinary single scroll tooth structure, the present scheme arranges a first static scroll tooth and a second static scroll tooth on the second-stage static scroll, so that the second-stage static scroll is a double scroll tooth structure, and arranges a first movable scroll tooth and a second movable scroll tooth on the movable scroll, so that the second-stage movable scroll is a double scroll tooth structure. The second-stage scroll compressor adopts a double scroll tooth structure. Under the premise of the same scroll disk outer dimensions and relative sliding speed, it can significantly increase the exhaust volume of the second-stage scroll compressor, and is beneficial to the compressor to increase exhaust, reduce compression ratio, reduce the overall dimensions of the machine, and can also reduce the relative sliding speed between the second-stage static scroll and the second-stage movable scroll and improve mutual force.

[0007] As an improvement, the first static scroll tooth completely overlaps with the second static scroll tooth after rotating 180° around the center of the secondary static scroll. In this technical solution, the first static scroll tooth and the second static scroll tooth are set as a central symmetrical structure, the double scroll tooth structure is simple, and the production cost is low.

[0008] As an improvement, the ends of the first static vortex and the second static vortex close to the center of the secondary static vortex are both in arc shape. In the technical solution, the ends of the first static vortex and the second static vortex close to each other are both in arc shape, that is, the vortex head of the secondary static vortex adopts arc correction vortex, so that the meshing process of the vortex is shortened, and the main shaft can be exhausted in advance after rotating a certain angle, thereby reducing the compression ratio.

[0009] As an improvement, the first movable scroll completely overlaps with the second movable scroll after rotating 180° around the center of the secondary movable scroll. In this technical solution, the first movable scroll and the second movable scroll are set as a central symmetrical structure, the double scroll structure is simple, and the production cost is low.

[0010] As an improvement, the ends of the first movable scroll and the second movable scroll close to the center of the secondary movable scroll are both in arc shape. In the technical solution, the ends of the first movable scroll and the second movable scroll close to each other are both in arc shape, that is, the vortex head of the secondary movable scroll adopts arc correction vortex, so that the meshing process of the vortex is shortened, and the main shaft can be exhausted in advance after rotating a certain angle, thereby reducing the compression ratio.

[0011] As an improvement, the secondary fixed scroll and the secondary movable scroll are eccentrically meshed. In the technical solution, the secondary fixed scroll and the secondary movable scroll are eccentrically meshed, so that the vortex tooth heads of the secondary fixed scroll and the secondary movable scroll both adopt arc-corrected non-fully meshed vortex teeth, so that the meshing process of the vortex teeth is shortened, and the main shaft is rotated by a certain angle to achieve early exhaust, thereby reducing the compression ratio.

[0012] As an improvement, the first fixed scroll tooth rotates 90° around the center of the secondary fixed scroll and translates to coincide with the first movable scroll tooth or the second movable scroll tooth. In this technical solution, the scroll tooth heads of the secondary fixed scroll and the secondary movable scroll both use arc-corrected non-fully meshing scroll teeth, which shortens the meshing process of the scroll teeth, and realizes early exhaust after the main shaft rotates a certain angle, thereby reducing the compression ratio.

[0013] As an improvement, an exhaust port is provided at the center of the second-stage static vortex. In this technical solution, the exhaust port is provided at the center of the second-stage static vortex to discharge the gas compressed in the second stage. The structure is simple, and the vortex tooth heads of the second-stage static vortex and the second-stage movable vortex both adopt arc-corrected non-fully meshing vortex teeth, so the exhaust port size can be made larger, which is beneficial to increase the exhaust volume of the whole machine; the second-stage scroll compressor exhausts air through the exhaust port at the center of the second-stage static vortex. In one exhaust cycle, the exhaust chamber volume and volume change rate of the second-stage scroll compressor have 4 cycles, the opening area of ​​the exhaust port and the exhaust port flow rate have 2 change cycles, and the working characteristics are stable.

[0014] As an improvement, the exhaust port is provided with a first depression and a second depression, the first depression is in contact with the end of the first static vortex tooth close to the center of the secondary static vortex disk, and the second depression is in contact with the end of the second static vortex tooth close to the center of the secondary static vortex disk. In this technical solution, the exhaust port is arranged at the center of the secondary static vortex disk, and the first depression for avoiding the tooth head of the first static vortex tooth and the second depression for avoiding the tooth head of the second static vortex tooth are arranged on the exhaust port, so that the size of the exhaust port can be made larger, which is beneficial to increase the exhaust volume of the whole machine.

[0015] As an improvement, the exhaust port is a centrally symmetrical figure, and the central symmetrical point of the exhaust port coincides with the center of the secondary static vortex. In this technical solution, the exhaust port is set as a centrally symmetrical figure, the exhaust port has symmetry, its working characteristics are periodically changed, and the fluctuation amplitude is small, and the operation is stable. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 This is a schematic diagram of the three-dimensional structure of a screw and scroll two-stage compression main engine of the present application.

[0017] Figure 2 This is a schematic cross-sectional structure diagram of a screw and scroll two-stage compression main unit of the present application.

[0018] Figure 3 This is a schematic diagram of the second-stage movable scroll in this application.

[0019] Figure 4 This is a schematic diagram of the secondary static vortex in this application.

[0020] Figure 5 This is a schematic diagram of the meshing of the secondary static scroll and the secondary movable scroll of the present application.

[0021] As shown in the figure: 1. a first-stage screw compressor; 11. a first-stage male screw; 12. a first-stage female screw; 2. a second-stage scroll compressor; 21. a second-stage static scroll; 211. a first static scroll tooth; 212. a second static scroll tooth; 22. a second-stage movable scroll; 221. a first movable scroll tooth; 222. a second movable scroll tooth; 23. an exhaust port; 231. a first depression; 232. a second depression. DETAILED DESCRIPTION

[0022] In order to better understand the present application, a more detailed description of various aspects of the present application will be made with reference to the accompanying drawings. It should be understood that these detailed descriptions are only descriptions of exemplary embodiments of the present application, and do not limit the scope of the present application in any way. Throughout the specification, the same figure numerals refer to the same elements.

[0023] In the drawings, the thickness, size and shape of objects have been slightly exaggerated for ease of explanation. The drawings are only examples and are not drawn strictly to scale.

[0024] It should also be understood that the terms “comprises,” “including,” “has,” “contains,” and “comprising,” when used in this specification, indicate the presence of the described features, integers, steps, operations, elements, and / or parts, but do not exclude the presence or addition of one or more other features, integers, steps, operations, elements, parts, and / or combinations thereof.

[0025] like Figures 1 to 5As shown, the present application discloses a screw and scroll two-stage compression main engine, including a first-stage screw compressor 1 and a second-stage scroll compressor 2, the first-stage screw compressor 1 and the second-stage scroll compressor 2 are arranged in series horizontally, a first-stage male screw 11 and a first-stage female screw 12 are installed in the first-stage screw compressor 1, and a second-stage static scroll 21 and a second-stage movable scroll 22 are installed in the second-stage scroll compressor. By arranging the first-stage screw compressor 1 and the second-stage scroll compressor 2 in series horizontally to form a screw and scroll two-stage compression main engine, the respective advantages of the screw compressor and the scroll compressor are combined and their respective defects can be overcome, and the second-stage scroll compressor 2 is arranged to operate through the second-stage static scroll 21 and the second-stage movable scroll 22 to mesh with each other to achieve Two-stage compression; the second-stage static scroll 21 is provided with a first static scroll tooth 211 and a second static scroll tooth 212, so that the second-stage static scroll 21 is a double scroll tooth structure, and the second-stage movable scroll 22 is provided with a first movable scroll tooth 221 and a second movable scroll tooth 222, so that the second-stage movable scroll 22 is a double scroll tooth structure. Compared with the ordinary single scroll tooth structure, the two-stage scroll compressor 2 of this scheme adopts a double scroll tooth structure. Under the premise of the same scroll plate outer dimensions and relative sliding speed, it can significantly increase the exhaust volume of the two-stage scroll compressor 2, and is beneficial to the compressor to increase exhaust, reduce compression ratio, reduce the overall dimensions of the machine, and can also reduce the relative sliding speed between the second-stage static scroll 21 and the second-stage movable scroll 22 and improve mutual force, etc.

[0026] More specifically, Figure 4 As shown, the first static vortex tooth 211 completely overlaps with the second static vortex tooth 212 after rotating 180° around the center of the secondary static vortex disk 21. The first static vortex tooth 211 and the second static vortex tooth 212 are arranged as a centrally symmetrical structure. The double vortex tooth structure is simple and the production cost is relatively low. The ends of the first static vortex tooth 211 and the second static vortex tooth 212 close to the center of the secondary static vortex disk 21 are both arc-shaped, and the ends of the first static vortex tooth 211 and the second static vortex tooth 212 close to each other are both arc-shaped, that is, the vortex tooth head of the secondary static vortex disk 21 adopts arc-corrected vortex teeth, which shortens the meshing process of the vortex teeth and can exhaust in advance after the main shaft rotates a certain angle, thereby reducing the compression ratio.

[0027] More specifically, Figure 3As shown, the first movable scroll tooth 221 completely overlaps with the second movable scroll tooth 222 after rotating 180° around the center of the secondary movable scroll 22. The first movable scroll tooth 221 and the second movable scroll tooth 222 are arranged as a centrally symmetrical structure. The double scroll tooth structure is simple and the production cost is low. The ends of the first movable scroll tooth 221 and the second movable scroll tooth 222 close to the center of the secondary movable scroll 22 are both arc-shaped, and the ends of the first movable scroll tooth 221 and the second movable scroll tooth 222 close to each other are both arc-shaped, that is, the vortex tooth head of the secondary movable scroll 22 adopts an arc-corrected vortex tooth, which shortens the meshing process of the vortex tooth, and can exhaust in advance after the main shaft rotates a certain angle, thereby reducing the compression ratio.

[0028] More specifically, Figures 3 to 5 As shown, the secondary static scroll 21 and the secondary movable scroll 22 are eccentrically meshed. The secondary static scroll 21 and the secondary movable scroll 22 are eccentrically meshed so that the vortex tooth heads of the secondary static scroll 21 and the secondary movable scroll 22 both use arc-corrected non-fully meshing vortex teeth, which shortens the meshing process of the vortex teeth and realizes early exhaust after the main shaft rotates a certain angle, thereby reducing the compression ratio.

[0029] More specifically, Figures 3 to 5 As shown, the first static vortex tooth 211 rotates 90° around the center of the secondary static vortex disk 21 and translates to coincide with the first movable vortex tooth 221 or the second movable vortex tooth 222. The vortex tooth heads of the secondary static vortex disk 21 and the secondary movable vortex disk 22 both adopt arc-corrected non-fully meshing vortex teeth, which shortens the meshing process of the vortex teeth. After the main shaft rotates a certain angle, early exhaust is achieved, thereby reducing the compression ratio. The first static vortex tooth 211, the first movable vortex tooth 221, the second static vortex tooth 212 and the second movable vortex tooth 222 are meshed in sequence to form four groups of working chambers. Four working chambers complete suction at the same time in one cycle. After two-stage compression, the exhaust pressure of the main engine only needs to meet 0.8Mpa.

[0030] The pressure of the screw and scroll two-stage compression main engine designed in this application is 8 bar, and the secondary gas volume needs to reach 1.4m 3 / min, and provide a performance comparison of the two-stage scroll compressor 2 using a single scroll tooth and a double scroll tooth when the suction volume is the same, as shown in the following Table 1:

[0031]

[0032] Table 1

[0033] It can be seen from Table 1 above that, when the air intake and the scroll wheel are the same, the number of turns, height and eccentricity of the scroll wheel with double vortex teeth are significantly smaller than those with single vortex teeth. The double vortex teeth are beneficial to reduce the relative sliding speed and wear between the second-stage static scroll 21 and the second-stage movable scroll 22, as well as reduce the overturning moment of the second-stage movable scroll 22. The two-stage compression main engine is designed according to a near-isobaric or under-compression ratio, and the first-stage and second-stage pressure ratios are both 3 bar. The scroll wheel with a single vortex tooth cannot meet the design requirements, while the scroll wheel with double vortex teeth itself has the characteristics of large air intake and low compression ratio. Therefore, the two-stage scroll compressor 2 of this structure is combined with the first-stage screw compressor 1 to meet the design requirements, so that the compressor energy consumption is lower and the energy saving purpose is achieved.

[0034] More specifically, Figure 4 As shown, an exhaust port 23 is provided at the center of the second-stage static scroll 21. The exhaust port 23 is provided at the center of the second-stage static scroll 21 to discharge the gas compressed in the second stage. The structure is simple, and the vortex tooth heads of the second-stage static scroll 21 and the second-stage movable scroll 22 both adopt arc-corrected non-fully meshing vortex teeth. Therefore, the size of the exhaust port 23 can be made larger, which is beneficial to increase the exhaust volume of the whole machine; the second-stage scroll compressor 2 exhausts air through the exhaust port 23 at the center of the second-stage static scroll 21. In one exhaust cycle, the exhaust chamber volume and volume change rate of the second-stage scroll compressor 2 have four cycles, the opening area of ​​the exhaust port 23 and the flow rate of the exhaust port 23 have two change cycles, and the working characteristics are stable.

[0035] More specifically, Figure 4 As shown, the exhaust port 23 is provided with a first recess 231 and a second recess 232. The first recess 231 is fitted with the end of the first static vortex tooth 211 close to the center of the secondary static vortex disk 21, and the second recess 232 is fitted with the end of the second static vortex tooth 212 close to the center of the secondary static vortex disk 21. The exhaust port 23 is arranged at the center of the secondary static vortex disk 21. By arranging the first recess 231 for avoiding the tooth head of the first static vortex tooth 211 and the second recess 232 for avoiding the tooth head of the second static vortex tooth 212 on the exhaust port 23, the size of the exhaust port 23 can be made larger, which is beneficial to increasing the exhaust volume of the whole machine.

[0036] More specifically, Figure 4 As shown, the exhaust port 23 is a centrally symmetrical figure, and the central symmetrical point of the exhaust port 23 coincides with the center of the circle of the secondary static vortex disk 21. The exhaust port 23 is set as a centrally symmetrical figure. The exhaust port 23 has symmetry, and its working characteristics show periodic changes with a small fluctuation amplitude, and the operation is stable.

[0037] The present application is not limited to the above-mentioned optimal implementation mode. Anyone can derive other forms of products under the inspiration of this application. However, no matter what changes are made in the shape or structure, all technical solutions that are the same or similar to those of the present application fall within the protection scope of the present application.

Claims

1. A screw and scroll two-stage compression main engine, comprising a first-stage screw compressor (1) and a second-stage scroll compressor (2), characterized in that: The first-stage screw compressor (1) and the second-stage scroll compressor (2) are arranged in series horizontally. The first-stage screw compressor (1) is provided with a first-stage male screw (11) and a first-stage female screw (12) that mesh with each other. The second-stage scroll compressor (2) is provided with a second-stage stationary scroll (21) and a second-stage movable scroll (22) that mesh with each other. The second-stage stationary scroll (21) is provided with a first stationary scroll tooth (211) and a second stationary scroll tooth (212). The second-stage movable scroll (22) is provided with a first movable scroll tooth (221) and a second movable scroll tooth (222).

2. A screw and scroll two-stage compression main engine according to claim 1, characterized in that: The first static scroll tooth (211) completely overlaps with the second static scroll tooth (212) after rotating 180° around the center of the secondary static scroll disk (21).

3. A screw and scroll two-stage compression main engine according to claim 2, characterized in that: The ends of the first static scroll tooth (211) and the second static scroll tooth (212) close to the center of the secondary static scroll (21) are both in an arc shape.

4. A screw and scroll two-stage compression main engine according to claim 1, characterized in that: The first movable scroll (221) completely overlaps with the second movable scroll (222) after rotating 180° around the center of the secondary movable scroll (22).

5. A screw and scroll two-stage compression main engine according to claim 4, characterized in that: The ends of the first movable scroll (221) and the second movable scroll (222) close to the center of the secondary movable scroll (22) are both in an arc shape.

6. A screw and scroll two-stage compression main engine according to claim 1, 2 or 4, characterized in that: The secondary static scroll (21) and the secondary movable scroll (22) are eccentrically meshed.

7. A screw and scroll two-stage compression main engine according to claim 6, characterized in that: The first fixed scroll (211) rotates 90 degrees around the center of the secondary fixed scroll (21) and translates to overlap with the first movable scroll (221) or the second movable scroll (222).

8. A screw and scroll two-stage compression main engine according to claim 1, 2 or 4, characterized in that: An exhaust port (23) is provided at the center of the secondary static vortex disk (21).

9. A screw and scroll two-stage compression main engine according to claim 8, characterized in that: The exhaust port (23) is provided with a first recess (231) and a second recess (232), wherein the first recess (231) is fitted with an end of the first static vortex tooth (211) close to the center of the secondary static vortex disk (21), and the second recess (232) is fitted with an end of the second static vortex tooth (212) close to the center of the secondary static vortex disk (21).

10. A screw and scroll two-stage compression main engine according to claim 9, characterized in that: The exhaust port (23) is a centrally symmetrical figure, and the centrally symmetrical point of the exhaust port (23) coincides with the center of the circle of the secondary static vortex disk (21).

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