Slide valve applied to screw compressor and screw compressor

Abstract

The sliding valve comprises a valve body, the valve body is provided with a first circular arc surface, a second circular arc surface and a third circular arc surface which are distributed in the circumferential direction, the second circular arc surface is matched with a male rotor to avoid the male rotor, and the third circular arc surface is matched with the third circular arc surface. The third arc surface is matched with the female rotor to avoid the female rotor, the valve body is provided with an inwards-concave end matched with the molded lines of the compression cavities of the female rotor and the male rotor, and the valve body slides in the axial direction of the meshing section of the female rotor and the male rotor and separates the two adjacent compression cavities through the inwards-concave end. The inner concave end of the sliding valve is designed to be matched with the molded lines of the compression cavities of the female rotor and the male rotor, and the sliding valve can separate the two adjacent compression cavities in the process of sliding in the axial direction, so that the two adjacent compression cavities are sequentially communicated with the air suction cavity, the operation efficiency of a main engine is guaranteed, and vibration is reduced.

Description

Technical Field

[0001] This application relates to the technical field of compressors, and more specifically to a slide valve applied to a screw compressor and a screw compressor. Background Art

[0002] A screw compressor is a rotary positive-displacement compressor. Driven by an electric motor, the male rotor and the female rotor mesh with each other and rotate synchronously, causing the volume of the working chamber to change periodically, thereby realizing the working process of suction, compression, and exhaust. The most commonly used method for adjusting the gas volume of a screw compressor is to set an axially movable slide valve between the two rotors. The movement of the slide valve position can change the effective working length of the screw rotors, thereby achieving the purpose of adjusting the gas volume. Therefore, the slide valve is a very critical component in a screw compressor. The slide valve is generally installed at the intersection of the two circles of the male and female rotors and forms a sealed space with the cylinder block of the compressor to complete the compression of the gas. The slide valve moves back and forth inside the compressor to connect part of the gas space in the original compression chamber with the intake end and change the radial exhaust port to realize the change of the internal volume ratio. For example, the utility model patent with the publication number: CN208996965U discloses a slide valve of a screw compressor with an air flow pulsation attenuation function. The slide valve is mainly composed of a wall surface and a slide valve through-hole. The slide valve includes a valve body. The valve body includes a plurality of wall surfaces located on the circumference of the valve body for respectively forming sealing mating surfaces with the body, the male rotor, and the female rotor of the screw compressor. On the exhaust side end surface of the valve body, there are more than 2 internal through-holes extending towards the intake side end surface of the valve body, and any one of the internal through-holes is connected to more than 1 other internal through-hole. The male rotor and the female rotor mesh with each other to form a plurality of compression chambers along the axis. When the slide valve slides axially, it sequentially opens the connection between each compression chamber and the intake end, and the gas in the plurality of compression chambers flows back to the intake end, which will cause a sharp drop in the efficiency of the compressor and a sudden change in vibration and noise. As shown in the attached Figure 4 As shown, the wall surfaces of the current slide valve are all composed of two concave curved surfaces and an arc surface. When the slide valve slides axially, there will be a situation where the next compression chamber is exposed while not completely disengaging from the previous compression chamber, causing the two adjacent compression chambers to be simultaneously connected to the intake end, which will lead to a sharp drop in the efficiency of the main unit and an increase in vibration. Summary of the Invention

[0003] The technical problem to be solved by this application is to provide a slide valve applied to a screw compressor and a screw compressor. The slide valve is designed with an inner concave end to match the compression chamber profile of the female rotor and the male rotor. When the slide valve slides axially, it can separate two adjacent compression chambers, so that the two adjacent compression chambers are sequentially connected to the suction chamber, thereby ensuring the operation efficiency of the main unit and reducing vibration.

[0004] The present application provides a slide valve applied to a screw compressor, including a valve body. The valve body is provided with a first arc surface, a second arc surface and a third arc surface distributed circumferentially. The second arc surface is adapted to the male rotor to avoid the male rotor, and the third arc surface is adapted to the female rotor to avoid the female rotor. The valve body is provided with a concave end adapted to the compression cavity profile of the female rotor and the male rotor. The valve body axially slides along the meshing section of the female rotor and the male rotor and separates two adjacent compression cavities through the concave end.

[0005] In this technical solution, the valve body is provided with a first arc surface, a second arc surface and a third arc surface. The valve body is installed and fitted with the inner wall of the screw compressor through the first arc surface. Both the second arc surface and the third arc surface are recessed inward, so that the slide valve can avoid the male rotor through the second arc surface and avoid the female rotor through the third arc surface, preventing the female rotor and the male rotor from colliding with the valve body surface during rotation and causing wear. The male rotor and the female rotor mesh with each other to form multiple compression cavities axially. During the axial sliding process of the slide valve, each compression cavity is sequentially opened to communicate with the intake end. In this solution, a concave end is added to the valve body, and the concave end is adapted to the compression cavity profile, so that the slide valve can separate two adjacent compression cavities during the axial sliding process, preventing two adjacent compression cavities from being simultaneously connected to the intake end, thus ensuring the operation efficiency of the main engine and reducing vibration.

[0006] As an improvement, the concave end is provided with a first arc surface, and the first arc surface is adapted to the helical tooth profile of the male rotor. In this technical solution, a first arc surface adapted to the helical tooth profile of the male rotor is provided at the concave end. The first arc surface is recessed inward and has the same radian as the helical tooth profile of the male rotor, so that the valve body can completely disengage from the previous compression cavity and coincide with the helical teeth of the male rotor in the next compression cavity during the axial sliding process, thereby separating the two compression cavities of the male rotor. The structure is simple and the design is ingenious.

[0007] As an improvement, the concave end is provided with a second arc surface, and the second arc surface is adapted to the helical tooth profile of the female rotor. In this technical solution, a second arc surface adapted to the helical tooth profile of the female rotor is provided at the concave end. The second arc surface is recessed inward and has the same radian as the helical tooth profile of the female rotor, so that the valve body can completely disengage from the previous compression cavity and coincide with the helical teeth of the female rotor in the next compression cavity during the axial sliding process, thereby separating the two compression cavities of the female rotor. The structure is simple and the design is ingenious.

[0008] As an improvement, the concave end is in a herringbone shape. In this technical solution, the compression cavities formed axially by the meshing of the male rotor and the female rotor are in a herringbone shape. The concave end is set in a herringbone shape, so that the concave end is adapted to the compression cavity profile, and thus two adjacent compression cavities can be separated during the sliding process. The structure is simple and the design is ingenious.

[0009] As an improvement, the valve body is arrow-shaped. In this technical solution, the compression chambers formed by the meshing of the male rotor and the female rotor along the axial direction are in a herringbone shape. The valve body is arranged to be arrow-shaped as a whole, so that the valve body is adapted to the profile of each compression chamber during the sliding process, thereby enabling each compression chamber to be sequentially communicated with the intake end, with a simple structure and ingenious design.

[0010] This application can also provide a screw compressor, including a cylinder, in which a female rotor, a male rotor and a sliding valve are installed. The sliding valve is the sliding valve described in any of the foregoing solutions. The female rotor and the male rotor are meshed and sequentially form a plurality of compression chambers along the axial direction. In this technical solution, the female rotor and the male rotor are installed in the cylinder. The female rotor and the male rotor are meshed with each other and have opposite rotation directions. A sliding valve is installed at the meshing section of the female rotor and the male rotor. The sliding valve and the cylinder form a closed space to complete the compression of the gas. The sliding valve axially slides to make part of the gas space in the original compression chamber communicate with the intake end to adjust the gas delivery volume. The female rotor and the male rotor are meshed and sequentially form a plurality of compression chambers along the axial direction. The sliding valve is provided with an inner concave end adapted to the profile of the compression chamber. The sliding valve can separate two adjacent compression chambers during the axial sliding process, avoiding the simultaneous connection of two adjacent compression chambers to the intake end, thereby ensuring the operation efficiency of the main engine and reducing vibration.

[0011] As an improvement, an installation cavity adapted to the sliding valve is provided in the cylinder, and the sliding valve is slidably installed in the installation cavity. In this technical solution, the sliding valve is installed by being accommodated in the installation cavity, and the sliding valve can slide in the installation cavity to connect the compression chamber with the intake end, with simple and reliable installation.

[0012] As an improvement, the end of the installation cavity cooperating with the inner concave end is in a herringbone shape. In this technical solution, the inner concave end is adapted to the profile of the compression chamber, and the compression chamber is in a herringbone shape. The inner concave end is arranged to be in a herringbone shape, so that the inner concave end is adapted to the profile of the compression chamber. The end of the installation cavity is also arranged to be in a herringbone shape, so that the installation cavity can be adapted to install the sliding valve provided with the inner concave end, making the installation of the sliding valve more reliable. Description of the Drawings

[0013] Figure 1 It is a three-dimensional structure schematic diagram of a sliding valve applied to a screw compressor according to this application.

[0014] Figure 2 It is a three-dimensional structure schematic diagram of the cooperation between the sliding valve and the female rotor and the male rotor in this application.

[0015] Figure 3 It is a three-dimensional structure schematic diagram of the meshing of the female rotor and the male rotor in this application.

[0016] Figure 4 It is a bottom view of the cooperation between the sliding valve and the female rotor and the male rotor in the prior art.

[0017] Figure 5 This is the bottom view of the slide valve of the present application in cooperation with the female rotor and the male rotor.

[0018] Figure 6 This is the three-dimensional structural schematic diagram of the screw compressor in the present application.

[0019] Figure 7 This is the three-dimensional structural schematic diagram of the cylinder and the slide valve in the present application.

[0020] Figure 8 This is the three-dimensional structural schematic diagram of the cylinder in the present application.

[0021] As shown in the figure: 1. Valve body; 11. First arc surface; 12. Second arc surface; 13. Third arc surface; 14. Concave end; 141. First arc surface; 142. Second arc surface; 2. Cylinder; 21. Installation cavity; 3. Female rotor; 4. Male rotor; 5. Compression cavity. Detailed implementation mode

[0022] For a better understanding of the present application, more detailed descriptions 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 the exemplary embodiments of the present application and do not limit the scope of the present application in any way. Throughout the specification, the same reference numerals refer to the same elements.

[0023] In the accompanying drawings, for the sake of clarity, the thickness, dimensions and shapes of the objects have been slightly exaggerated. The drawings are only examples and are not drawn strictly to scale.

[0024] It should also be understood that the terms "comprising", "including", "having", "containing", "including" when used in this specification indicate the presence of the stated features, wholes, steps, operations, elements and / or components, but do not exclude the presence or addition of one or more other features, wholes, steps, operations, elements, components and / or their combinations. The terms "first", "second", etc. are mainly used to distinguish different devices, elements or components (the specific types and structures may be the same or different), and do not indicate or imply the relative importance and quantity of the indicated devices, elements or components. Unless otherwise specified, the meaning of "a plurality" is two or more.

[0025] In addition, it should be noted that: The terms "installed", "set up", "equipped with", "connected", and "linked" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral structure; it can be a mechanical connection or an electrical connection; it can be directly connected, or indirectly connected through an intermediate medium, or there is internal communication between two devices, components or parts; it can be directly set on another component or there may be another intermediate component at the same time. The terms "vertical", "horizontal", "left", "right" and similar expressions used herein are only for the purpose of illustration. Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those skilled in the technical field to which the present invention belongs. The terms used in the description of the present invention herein are only for the purpose of describing specific embodiments and are not intended to limit the present invention. The term "and / or" used herein includes any and all combinations of one or more of the related listed items.

[0026] Embodiment 1

[0027] As Figures 1 to 8 shown, the present application discloses a slide valve applied to a screw compressor, including a valve body 1. The valve body 1 is provided with a first arc surface 11, a second arc surface 12 and a third arc surface 13 distributed circumferentially. The second arc surface 12 is adapted to avoid the male rotor 4 to avoid the male rotor 4, and the third arc surface 13 is adapted to the female rotor 3 to avoid the female rotor 3. The valve body 1 is provided with a first arc surface 11, a second arc surface 12 and a third arc surface 13. The valve body 1 is installed and fitted with the inner wall of the screw compressor through the first arc surface 11. Both the second arc surface 12 and the third arc surface 13 are recessed inward, so that the slide valve can avoid the male rotor 4 through the second arc surface 12 and avoid the female rotor 3 through the third arc surface 13, preventing the female rotor 3 and the male rotor 4 from colliding with the surface of the valve body 1 during rotation and causing wear; As Figure 4 and Figure 5 shown, the valve body 1 is provided with a concave end 14 adapted to the profile of the compression chamber 5 of the female rotor 3 and the male rotor 4. It axially slides along the meshing section of the female rotor 3 and the male rotor 4 and separates two adjacent compression chambers 5 through the concave end 14. The male rotor 4 and the female rotor 3 are meshed with each other axially to form a plurality of compression chambers 5. During the axial sliding process of the slide valve, each compression chamber 5 is sequentially opened to communicate with the intake end. In this solution, a concave end 14 is added to the valve body 1, and the concave end 14 is adapted to the profile of the compression chamber 5, so that the slide valve can separate two adjacent compression chambers 5 during the axial sliding process. During the axial sliding process of the slide valve, the next compression chamber 5 can be separated by the concave end 14 within the stroke from the start of opening to the full opening of the current compression chamber 5 where the slide valve is located, preventing two adjacent compression chambers 5 from being connected to the intake end at the same time, thus ensuring the operation efficiency of the main engine and reducing vibration.

[0028] More specifically, as Figure 1 , Figure 2 and Figure 5 shown, the concave end 14 is provided with a first arc surface 141, and the first arc surface 141 is adapted to the helical tooth profile of the male rotor 4. By providing the first arc surface 141 adapted to the helical tooth profile of the male rotor 4 at the concave end 14, the first arc surface 141 is recessed inwardly and has the same curvature as the helical tooth profile of the male rotor 4, so that the valve body 1 can completely disengage from the previous compression chamber 5 while coinciding with the helical teeth of the male rotor 4 in the next compression chamber 5 during the axial sliding process, thereby separating the two compression chambers 5 of the male rotor 4. The structure is simple and the design is ingenious.

[0029] More specifically, as Figure 1 , Figure 2 and Figure 5 shown, the concave end 14 is provided with a second arc surface 142, and the second arc surface 142 is adapted to the helical tooth profile of the female rotor 3. By providing the second arc surface 142 adapted to the helical tooth profile of the female rotor 3 at the concave end 14, the second arc surface 142 is recessed inwardly and has the same curvature as the helical tooth profile of the female rotor 3, so that the valve body 1 can completely disengage from the previous compression chamber 5 while coinciding with the helical teeth of the female rotor 3 in the next compression chamber 5 during the axial sliding process, thereby separating the two compression chambers 5 of the female rotor 3. The structure is simple and the design is ingenious.

[0030] More specifically, as Figure 1 and Figure 5 shown, the concave end 14 is in a chevron shape, and the compression chamber 5 formed by the meshing of the male rotor 4 and the female rotor 3 along the axis is in a chevron shape. By setting the concave end 14 in a chevron shape, the concave end 14 is adapted to the profile of the compression chamber 5, so that two adjacent compression chambers 5 can be separated during the sliding process. The structure is simple and the design is ingenious.

[0031] More specifically, as Figure 1 and Figure 5 shown, the valve body 1 is in an arrow shape, and the compression chamber 5 formed by the meshing of the male rotor 4 and the female rotor 3 along the axis is in a chevron shape. By setting the whole valve body 1 in an arrow shape, the valve body 1 is adapted to the profile of each compression chamber 5 during the sliding process, so that each compression chamber 5 can be sequentially communicated with the intake end. The structure is simple and the design is ingenious.

[0032] Embodiment 2

[0033] As Figures 1 to 8As shown in the figure, this embodiment provides a screw compressor based on Embodiment 1, including a cylinder 2. An internal rotor 3, an external rotor 4 and a slide valve are installed in the cylinder 2. The slide valve is a slide valve applied to a screw compressor described in Embodiment 1. The internal rotor 3 meshes with the external rotor 4 and a plurality of compression chambers 5 are sequentially formed along the axial direction. The internal rotor 3 and the external rotor 4 are installed in the cylinder 2, and the internal rotor 3 and the external rotor 4 mesh with each other and have opposite rotation directions. The slide valve is installed at the meshing section of the internal rotor 3 and the external rotor 4. The slide valve and the cylinder 2 form a closed space to complete the compression of the gas. The slide valve axially slides to make part of the gas space located in the original compression chamber 5 communicate with the air inlet end to adjust the gas delivery volume. The internal rotor 3 meshes with the external rotor 4 and a plurality of compression chambers 5 are sequentially formed along the axial direction. The slide valve is provided with an inner concave end 14 adapted to the profile of the compression chamber 5. During the axial sliding process, the slide valve can separate two adjacent compression chambers 5 to prevent two adjacent compression chambers 5 from being connected to the air inlet end at the same time, thereby ensuring the operation efficiency of the main engine and reducing vibration.

[0034] More specifically, as Figure 7 and Figure 8 shown in the figure, an installation cavity 21 adapted to the slide valve is provided in the cylinder 2. The slide valve is slidably installed in the installation cavity 21. The slide valve is installed by being accommodated in the installation cavity 21, and the slide valve can slide in the installation cavity 21 to connect the compression chamber 5 with the air inlet end. The installation is simple and reliable.

[0035] More specifically, as Figure 7 and Figure 8 shown in the figure, the end of the installation cavity 21 cooperating with the inner concave end 14 is in a herringbone shape. The inner concave end 14 is adapted to the profile of the compression chamber 5, and the compression chamber 5 is in a herringbone shape. The inner concave end 14 is set to be in a herringbone shape so that the inner concave end 14 is adapted to the profile of the compression chamber 5. The end of the installation cavity 21 is also set to be in a herringbone shape, so that the installation cavity 21 can be adapted to install the slide valve provided with the inner concave end 14, making the installation of the slide valve more reliable.

[0036] This application is not limited to the above best embodiment. Anyone can obtain other various forms of products under the inspiration of this application. However, no matter what changes are made in its shape or structure, as long as it has the same or similar technical solutions as this application, they all fall within the protection scope of this application.

Claims

1. A slide valve applied to a screw compressor, comprising a valve body (1), characterized in that, The described valve body (1) is provided with a first arc surface (11), a second arc surface (12), and a third arc surface (13) distributed circumferentially. The second arc surface (12) is adapted to avoid the male rotor (4), and the third arc surface (13) is adapted to avoid the female rotor (3). The valve body (1) is provided with a concave end (14) adapted to the profile of the compression chamber (5) of the female rotor (3) and the male rotor (4). The valve body (1) slides axially along the meshing section of the female rotor (3) and the male rotor (4) and separates two adjacent compression chambers (5) through the concave end (14).

2. The slide valve applied to a screw compressor according to claim 1, characterized in that, The concave end (14) is provided with a first arc surface (141), and the first arc surface (141) is adapted to the helical tooth profile of the male rotor (4).

3. A slide valve applied to a screw compressor according to claim 1, characterized in that The concave end (14) is provided with a second arc surface (142), and the second arc surface (142) is adapted to the helical tooth profile of the female rotor (3).

4. A slide valve for a screw compressor according to claim 1, characterized in that The concave end (14) is in a herringbone shape.

5. The slide valve applied to a screw compressor according to claim 4, wherein, The valve body (1) is in an arrow shape.

6. A screw compressor, characterized in that, It includes a cylinder (2). Inside the cylinder (2), a female rotor (3), a male rotor (4), and a slide valve are installed. The slide valve is the slide valve for a screw compressor according to any one of claims 1-5. The female rotor (3) meshes with the male rotor (4) and sequentially forms a plurality of compression chambers (5) along the axis.

7. A screw compressor according to claim 6, characterized in that, An installation cavity (21) adapted to the slide valve is provided inside the cylinder (2), and the slide valve is slidably installed inside the installation cavity (21).

8. A screw compressor according to claim 7, characterized in that, The end of the installation cavity (21) cooperating with the concave end (14) is in a herringbone shape.

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