Sliding valve structure and screw compressor

Abstract

The application provides a slide valve structure and a screw compressor, and relates to the technical field of air conditioners, and solves the technical problem that the existing slide valve structure with a regular circle is prone to circumferential deflection. The cross section of the slide valve body of the slide valve structure comprises a female side circular arc corresponding to the inner wall of the female rotor cavity, a male side circular arc corresponding to the inner wall of the male rotor cavity, and a self-locking section, and the self-locking section is composed of multiple segments of lines, so that the slide valve body forms a multi-prism anti-rotation structure. After the slide valve body is assembled to the shell of the screw compressor, the slide valve body will not rotate, the deflection of the slide valve body is prevented, a limiting device is not needed, the complexity of the structure is avoided, the cost of the screw compressor is controlled, and the reliability of the screw compressor is improved. After the regular circle is changed into the self-locking multiple segments of lines, the radial dimension of the slide valve structure is greatly reduced, so that the height or width dimension of the compressor is more compact.

Description

Technical Field

[0001] The present invention relates to the technical field of air conditioners, and in particular to a sliding valve structure and a screw compressor. Background Art

[0002] Sliding valve is a very common regulating mechanism in screw compressors, usually used to adjust the capacity of the compressor or the internal compression ratio of the compressor. Figure 1 As shown, the cross-sectional profile of the slide valve 02 typically includes a circular arc segment for each of the male and female rotor cavities, representing the projection of the rotor cavity curved surface. Theoretically, it is desirable that this curved surface (male rotor cavity inner wall curved surface 011 and female rotor cavity inner wall curved surface 012) completely aligns with the rotor cavity inner wall curved surface (slide valve male side circular arc 021 and slide valve female side circular arc 022) to ensure a complete and smooth rotor cavity inner wall, perfectly enveloping the male and female rotors, thereby ensuring efficient and reliable operation of the compressor.

[0003] The applicant has discovered that the prior art has at least the following technical problems:

[0004] In actual applications, as reciprocating sliding valve parts, these two curved surfaces cannot completely match their respective rotor cavity inner wall curved surfaces due to differences in processing accuracy, assembly accuracy, reciprocating motion and thermal expansion forms; when the curved surface is higher than the rotor cavity inner wall curved surface (forming an intrusion portion 04), it may cause the rotor and the sliding valve curved surface to rub, causing failure; when the curved surface is lower than the rotor cavity inner wall curved surface, the gap 03 between the rotor tooth top and the sliding valve curved surface is larger than the gap between the rotor tooth top and the rotor cavity inner wall curved surface, causing additional leakage and reducing the efficiency of the compressor.

[0005] The contours of the current main sliding valve bodies are mostly perfect circles (except for the two curved surfaces mentioned above, the other parts are arc segments of a perfect circle). This makes it inevitable that the sliding valve 02 will randomly deflect in two directions. No matter which direction the sliding valve 02 deflects, the curved surface will be higher or lower than the curved surface of the inner wall of the rotor cavity. Figure 2 In order to limit the circumferential deflection of the slide valve 02 from being too large, a limit device, such as a positioning key, is usually set again, which increases the complexity of the slide valve mechanism, increases the cost of the compressor, and reduces reliability.

[0006] In addition, the diameter of a perfect circular sliding valve is often relatively large, especially for a sliding valve 02 with a low internal volume ratio and a large orifice. After meeting the shape requirements of the radial exhaust orifice of the sliding valve 02, the diameter of the sliding valve may even be close to the diameter of the compressor rotor, resulting in a significant increase in the size, weight and cost of the compressor. Summary of the Invention

[0007] The present invention aims to provide a slide valve structure and a screw compressor that at least address the technical problem of circular slide valve structures being susceptible to circumferential runout in the prior art. The various technical effects achieved by the preferred solution among the various technical solutions provided by the present invention are detailed below.

[0008] To achieve the above objectives, the present invention provides the following technical solutions:

[0009] The present invention provides a sliding valve structure, including a sliding valve body, the cross-section of which includes a female side arc corresponding to the inner wall of the female rotor cavity, a male side arc corresponding to the inner wall of the male rotor cavity, and a self-locking section, and the self-locking section is composed of multiple lines, so that the sliding valve body forms a polygonal anti-rotation structure, which can limit the self-rotation of the sliding valve body.

[0010] Optionally, the self-locking section is composed of a plurality of straight line segments.

[0011] Optionally, there is a smooth transition between the plurality of straight line segments.

[0012] Optionally, the self-locking section includes three straight line segments.

[0013] Optionally, the self-locking section includes a first section, a second section and a third section, and the first section is arranged horizontally.

[0014] Optionally, the second segment and the third segment are symmetrically arranged along a perpendicular bisector of the first segment.

[0015] Optionally, the included angle between the second section and the first section is α, the included angle between the third section and the first section is β, and both the included angle α and the included angle β are acute angles.

[0016] Optionally, the angle α=β.

[0017] Optionally, the self-locking section tapers from the bottom side away from the rotor cavity toward the direction close to the rotor cavity.

[0018] The present invention provides a screw compressor comprising a housing and any one of the above-mentioned sliding valve structures.

[0019] The present invention provides a sliding valve structure and a screw compressor having the sliding valve structure. The cross-section of the sliding valve body includes a female side arc corresponding to the inner wall of the female rotor cavity, a male side arc corresponding to the inner wall of the male rotor cavity, and a self-locking section, and the self-locking section is composed of multiple lines, so that the sliding valve body forms a multi-prism anti-rotation structure. After the sliding valve body is assembled to the shell of the screw compressor, it will not rotate on its own, thereby preventing the sliding valve body from swinging. There is no need to set a limit device, thus avoiding the complexity of the structure, controlling the cost of the screw compressor, and improving the reliability of the screw compressor. After changing from a perfect circle to a self-locking multiple-segment line, the radial dimension of the sliding valve structure is greatly reduced, making the height or width dimension of the compressor more compact. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0021] Figure 1 This is a schematic cross-sectional view of a screw compressor with a true circular slide valve in the prior art;

[0022] Figure 2 yes Figure 1 Schematic diagram of the state when the middle slide valve structure produces deflection;

[0023] Figure 3 This is a structural schematic diagram of the first sliding valve structure provided by a specific embodiment of the present invention when installed in a screw compressor;

[0024] Figure 4 It is a structural schematic diagram of the second sliding valve structure provided by a specific embodiment of the present invention when installed in a screw compressor.

[0025] In the figure, 01 is the compressor housing; 011 is the inner curved surface of the male rotor cavity; 012 is the inner curved surface of the female rotor cavity; 02 is the slide valve; 021 is the arc on the male side of the slide valve; 022 is the arc on the female side of the slide valve; 03 is the gap; 04 is the intrusion portion;

[0026] 1. Housing; 11. Inner wall of the male rotor cavity; 12. Inner wall of the female rotor cavity; 2. Sliding valve body; 21. Male side arc; 22. Female side arc; 23. Self-locking section; 231. First section; 232. Second section; 233. Third section. DETAILED DESCRIPTION

[0027] To make the objectives, technical solutions, and advantages of the present invention more apparent, the technical solutions of the present invention will be described in detail below. Obviously, the embodiments described are only some of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other implementations obtained by those of ordinary skill in the art without inventive effort are within the scope of protection of the present invention.

[0028] like Figure 3 and Figure 4 As shown, the present invention provides a sliding valve structure, including a sliding valve body 2, the cross-section of the sliding valve body 2 includes a female side arc 22 corresponding to the inner wall 12 of the female rotor cavity, a male side arc 21 corresponding to the inner wall 11 of the male rotor cavity, and a self-locking section 23, and the self-locking section 23 is composed of multiple lines, so that the sliding valve body 2 forms a polygonal anti-rotation structure, which can limit the self-rotation of the sliding valve body 2.

[0029] The cross section of the sliding valve body 2 includes a self-locking section 23, which is composed of multiple lines, so that the sliding valve body 2 forms a polygonal anti-rotation structure. After the sliding valve body 2 is assembled to the housing 1 of the screw compressor, it will not rotate on its own, thereby preventing the sliding valve body 2 from swinging. Therefore, there is no need to set a limit device, avoiding structural complexity, controlling the cost of the screw compressor, and improving the reliability of the screw compressor.

[0030] As an optional embodiment, the self-locking section 23 is composed of a plurality of straight line segments, thereby effectively preventing the sliding valve body 2 from rotating.

[0031] As an optional implementation, the multiple straight line segments have smooth transitions to reduce damage from bumps and collisions.

[0032] As an optional embodiment, the self-locking section 23 includes three straight segments: a first segment 231, a second segment 232, and a third segment 233. The first segment 231 is arranged horizontally. This prevents the sliding valve body 2 from rotating, resulting in a simple structure and easy processing. The horizontal arrangement of the first segment 231 facilitates vertical dimension reduction, i.e., reducing the radial dimension of the sliding valve structure, simplifying the structure, and saving costs.

[0033] As an optional implementation, the second section 232 and the third section 233 are symmetrically arranged along the perpendicular bisector of the first section 231, and do not need to be distinguished during installation, which is quick and easy.

[0034] As an optional implementation, the angle between the second section 232 and the first section 231 is α, and the angle between the third section 233 and the first section 231 is β, and both the angle α and the angle β are acute angles, forming a conical structure with a lower dimension larger than an upper dimension, thereby preventing the sliding valve body 2 from lifting.

[0035] As an optional implementation, the angle α=β, the structure is symmetrical, and processing and installation are convenient.

[0036] As an optional implementation, the self-locking section 23 gradually shrinks from the bottom side away from the rotor cavity to the direction close to the rotor cavity, which can ensure that the sliding valve does not have the hidden danger of lifting without adding an additional limiting mechanism.

[0037] like Figure 3 As shown, the cross-sectional profile of the sliding valve is composed of a male arc 21, a female arc 22, a male plane of the second section 232 serving as the self-locking section 23, a female plane of the third section 233, and a bottom plane of the first section 231. This cross-sectional shape prevents circumferential deflection of the sliding valve body 2 when assembled in the screw compressor housing 1, eliminating the need for additional anti-deflection structures. Furthermore, with the exception of the male arc 21 and female arc 22, the remaining sections of the sliding valve body 2 are no longer composed of a single arc, but rather of several planes projected as straight line segments. This allows the vertical distance H from the first section 231 to the center of the rotor cavity to be arbitrarily set based on practical needs, typically minimizing H to a minimum value based on processability. This prevents the sliding valve body 2 from adding additional width or height to the overall compressor, resulting in a more compact design.

[0038] like Figure 4 As shown, the positive side plane and the negative side plane of the sliding valve are tilted toward the middle, with tilt angles α and β respectively, so that the sliding valve body 2 will be "locked" by the casing 1 of the screw compressor, limiting the upward lifting of the sliding valve body 2.

[0039] In practical applications, the lengths of the male and female arcs 21 and 22 of the sliding valve can be adjusted arbitrarily based on the size of the compressor's exhaust port, no longer constrained by the dimension H. For conventional circular sliding valves, the distance from the axis to the connecting line between the male and female rotor cavities is determined, and then the radius of the sliding valve is added to determine the dimension H. When the sliding valve is no longer designed as a perfect circle, this radius no longer defines H. This allows the sliding valve to be made flatter, reducing the dimension H and, consequently, the size of the compressor, making the screw compressor more compact.

[0040] The present invention provides a screw compressor comprising a housing 1 and any one of the above sliding valve structures.

[0041] After using the sliding valve structure, the screw compressor can limit itself to prevent deflection without adding additional components. At the same time, the radial dimension of the sliding valve structure is greatly reduced, making the height or width of the compressor more compact, thereby reducing the cost of the compressor, simplifying the structure of the compressor's operating components, and improving the performance and reliability of the compressor.

[0042] In the description of the invention, it should be noted that, unless otherwise specified, "plurality" means two or more; the terms "upper", "lower", "left", "right", "inner", "outer", "front", "rear", "head", "tail", etc., indicating directions or positional relationships, are based on the directions or positional relationships shown in the accompanying drawings and are intended only to facilitate the description of the invention and simplify the description. They do not indicate or imply that the devices or elements referred to must have a specific direction, be constructed and operate in a specific direction, and therefore should not be construed as limiting the invention. In addition, the terms "first", "second", "third", etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0043] In the description of the present invention, it should be noted that, unless otherwise expressly specified or limited, the terms "mounted," "connected," and "connected" should be understood broadly. For example, they may refer to fixed, detachable, or integral connections; mechanical or electrical connections; and direct or indirect connections through an intermediary. Those skilled in the art will understand the specific meanings of these terms in the present invention depending on the specific circumstances.

[0044] The above description is merely a specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any modifications or substitutions that can be easily conceived by a person skilled in the art within the technical scope disclosed in the present invention should be included within the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be based on the scope of protection of the claims.

Claims

1. A slide valve structure, characterized in that: The invention comprises a sliding valve body (2), wherein the cross section of the sliding valve body (2) comprises a female side circular arc (21) corresponding to the inner wall (11) of the female rotor cavity, a male side circular arc (22) corresponding to the inner wall (12) of the male rotor cavity, and a self-locking section (23), wherein the self-locking section (23) is composed of multiple lines, so that the sliding valve body (2) forms a multi-prism anti-rotation structure, which can limit the self-rotation of the sliding valve body (2); The self-locking section (23) includes three straight line segments; The self-locking section (23) comprises a first section (231), a second section (232) and a third section (233), wherein the first section (231) is arranged horizontally; The second section (232) and the third section (233) are symmetrically arranged along a perpendicular bisector of the first section (231); The self-locking section (23) gradually contracts from the bottom side away from the rotor cavity toward the direction close to the rotor cavity.

2. The slide valve structure according to claim 1, characterized in that: The self-locking section (23) is composed of a plurality of straight line sections.

3. The slide valve structure according to claim 2, characterized in that: There is a smooth transition between the plurality of straight line segments.

4. The slide valve structure according to claim 1, characterized in that: The included angle between the second section (232) and the first section (231) is α, the included angle between the third section (233) and the first section (231) is β, and both the included angle α and the included angle β are acute angles.

5. The slide valve structure according to claim 4, characterized in that: The angle α=β.

6. A screw compressor, characterized in that: It comprises a housing (1) and a sliding valve structure according to any one of claims 1 to 5.

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