Star wheel structure and single-screw compressor

Abstract

The utility model belongs to the technical field of screw compressors, and discloses a star wheel structure and a single screw compressor, the star wheel structure comprises a body part and a plurality of star wheel teeth, and the plurality of star wheel teeth are sequentially arranged on the periphery of the body part; the side face of the star wheel tooth comprises two connected meshing faces, the two meshing faces are connected with the two end faces of the star wheel tooth correspondingly, and the meshing face located on the top and a spiral groove of a screw can define a lubricating oil flowing cavity. The size of the lubricating oil flowing cavity located at the tooth root is smaller than that of the lubricating oil flowing cavity located at the tooth top, and a blocking part is arranged between the lubricating oil flowing cavity located at the tooth root and the lubricating oil flowing cavity located at the tooth top. The star wheel structure can prevent lubricating oil from flowing to tooth roots, end leakage of the lubricating oil is reduced, the stability of oil film pressure at the meshing position between the star wheel structure and the screw is improved, and star wheel piece abrasion caused by oil film breakage is prevented.

Description

Technical Field

[0001] The utility model relates to the technical field of screw compressors, in particular to a planetary wheel structure and a single-screw compressor. Background Art

[0002] Compressors are widely used in industries such as railways, ships, mining, construction, chemicals, refrigeration, textiles, metallurgical machinery, military instruments, and ships. Compared with reciprocating piston compressors and twin-screw compressors, single-screw compressors have advantages such as simple structure, reliable operation, small size, light weight, and low noise.

[0003] Existing single-screw compressors consist of a screw and two symmetrically arranged star wheels, forming a meshing pair and housed within a casing. The screw groove, the inner wall of the casing, and the star wheel blades form a closed volume. Gas enters the screw groove from the suction chamber, is compressed by the meshing of the screw groove and the star wheel, and is then discharged through the exhaust port and the exhaust chamber to achieve gas compression. Furthermore, lubricating oil circulates between the screw groove and the star wheel, as well as between the screw groove and the inner wall of the casing, to form an oil film. This oil film pushes the star wheel tooth surface away from the screw groove surface, preventing tooth surface wear. However, due to the presence of the helical inclination angle, a leakage hole is formed between the screw groove and the root of the star wheel tooth. When the single-screw compressor is in operation, the lubricating oil flows into the meshing area between the screw groove and the star wheel and leaks from the root of the star wheel tooth. This causes the oil film to leak out, resulting in a decrease in oil film pressure, thinning of the oil film, and reduced stability. This in turn causes wear on the star wheel tooth blades, affecting the service life of the star wheel.

[0004] Therefore, there is an urgent need for a planetary wheel structure and a single-screw compressor to solve the above technical problems. Utility Model Content

[0005] One purpose of the present utility model is to provide a star wheel structure, which can be more conducive to the establishment of a dynamic pressure oil film, and block the connection between the lubricating oil flow chamber at the tooth root and the lubricating oil flow chamber at the tooth top, thereby reducing the end leakage of lubricating oil, improving the stability of the oil film pressure at the meshing point between the star wheel structure and the screw, and preventing the oil film from rupturing and causing wear of the star wheel pieces.

[0006] To achieve this purpose, the present invention adopts the following technical solutions:

[0007] The star gear structure includes a main body and a plurality of star gear teeth, and the plurality of star gear teeth are sequentially arranged on the outer periphery of the main body; the side surface of the star gear teeth includes two connected meshing surfaces, and the two meshing surfaces are respectively connected to the two end faces of the star gear teeth, and the meshing surface located at the top can be combined with the spiral groove of the screw to form a lubricating oil flow chamber, and the volume of the lubricating oil flow chamber located at the tooth root is smaller than the volume of the lubricating oil flow chamber located at the tooth top, and a blocking portion is provided between the lubricating oil flow chamber located at the tooth root and the lubricating oil flow chamber located at the tooth top.

[0008] Optionally, the inclination angle at the tooth root of the above-mentioned meshing surface at the top is smaller than the inclination angle at the tooth top of the above-mentioned meshing surface at the top, so as to form the above-mentioned blocking portion.

[0009] Optionally, the meshing surface located at the top includes at least two connecting surfaces arranged sequentially from the tooth root to the tooth top, and the inclination angles of at least two of the connecting surfaces increase sequentially along the direction from the tooth root to the tooth top, so that a step-shaped blocking portion is formed at the junction of two adjacent connecting surfaces, and the blocking portion is used to prevent the leakage of lubricating oil.

[0010] Optionally, along the direction from the tooth root to the tooth top, the inclination angle of at least one of the above-mentioned connecting surfaces gradually increases from the side close to the tooth root toward the side close to the tooth top, so that the junction of two adjacent above-mentioned connecting surfaces forms the above-mentioned blocking portion in the shape of a broken line.

[0011] Optionally, two connecting surfaces are provided, and the blocking portion between the two connecting surfaces is arranged close to the tooth root.

[0012] Optionally, the side surfaces of the star gear teeth include a front side surface and a rear side surface, and the inclination angle of at least one of the front side surface and the rear side surface at the tooth root of the meshing surface at the top is smaller than the inclination angle at the tooth top of the meshing surface at the top.

[0013] Optionally, the inclination angle at the tooth root of the meshing surface at the top is α1, and the inclination angle at the tooth top of the meshing surface at the top is α2, Δα=α2-α1, 5°≤Δα≤30°.

[0014] Optionally, along the direction from the tooth root to the tooth top, the width of the above-mentioned meshing surface located at the top gradually increases.

[0015] Optionally, the angle between the two meshing surfaces is an obtuse angle to form a contact line, and the contact line meshes with the screw.

[0016] Another object of the present invention is to provide a single-screw compressor, which can be more conducive to the establishment of a dynamic pressure oil film, and block the connection between the lubricating oil flow chamber located at the tooth root and the lubricating oil flow chamber located at the tooth top, thereby reducing the end leakage of lubricating oil, improving the stability of the oil film pressure at the meshing point between the star wheel structure and the screw, and preventing the oil film from rupturing and causing wear of the star wheel pieces.

[0017] To achieve this purpose, the present invention adopts the following technical solutions:

[0018] A single-screw compressor comprises a casing, a screw arranged in the casing, and two planetary gear structures described in any of the above schemes, wherein the two planetary gear structures are symmetrically arranged on both sides of the screw and meshedly connected with the screw.

[0019] Optionally, the screw is provided with a spiral groove, and the star gear teeth of the star gear structure are meshedly connected with the spiral groove.

[0020] Beneficial effects of the utility model:

[0021] The utility model provides a star wheel structure and a single-screw compressor. By making the volume of the lubricating oil flow chamber at the tooth root smaller than the volume of the lubricating oil flow chamber at the tooth top, and providing a blocking portion between the lubricating oil flow chamber at the tooth root and the lubricating oil flow chamber at the tooth top, the lubricating oil is blocked when flowing toward the tooth root, thereby reducing the amount of oil leakage at the end, improving the stability of the oil film pressure, and preventing the oil film from rupturing and causing wear of the star wheel. At the same time, the volume of the lubricating oil flow chamber at the tooth top is larger, which increases the oil inlet area there, allowing the lubricating oil to flow from the oil hole more quickly into the convergent oil gap between the tooth top of the star wheel tooth and the spiral groove, thereby facilitating the establishment of a dynamic pressure oil film between the tooth top of the star wheel tooth and the spiral groove, and improving the service life of the single-screw compressor. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 This is a schematic diagram of the structure of the engagement between the profile line at the tooth root of the star wheel structure provided by the specific embodiment of the present invention and the screw;

[0023] Figure 2 This is a cross-sectional view of the star gear teeth in the star gear structure provided by the specific embodiment of the present utility model;

[0024] Figure 3 This is an axonometric diagram of the star wheel structure provided by a specific embodiment of the present utility model;

[0025] Figure 4 yes Figure 3 A is a partial enlarged view of a stepped barrier portion in some embodiments;

[0026] Figure 5 yes Figure 3 A is a partial enlarged view of the blocking portion with a broken line shape on the connecting surface in some embodiments.

[0027] In the picture:

[0028] 10. Body part;

[0029] 20. Star gear teeth; 201. Front side; 202. Rear side; 203. End face; 21. Meshing surface; 211. Connecting surface; 22. Blocking portion; 23. Contact line;

[0030] 101. Screw helical surface; 102. Leakage triangle. DETAILED DESCRIPTION

[0031] The present invention will be described in further detail below with reference to the accompanying drawings and embodiments. It is understood that only some structures are included, not all.

[0032] In the description of this utility model, unless otherwise specified or limited, the terms "connected," "connect," and "fixed" should be understood in a broad sense. For example, they can refer to fixed connection, detachable connection, or integration; mechanical connection or electrical connection; direct connection or indirect connection through an intermediate medium; internal communication between two components or interaction between two components. Those skilled in the art will understand the specific meanings of the above terms in this utility model based on the specific circumstances.

[0033] In the present invention, unless otherwise expressly specified or limited, a first feature being "above" or "below" a second feature may include the first and second features being in direct contact, or may include the first and second features being in contact not directly but through another feature between them. Moreover, a first feature being "above," "above," and "above" a second feature may include the first feature being directly above or obliquely above the second feature, or may simply mean that the first feature is higher in level than the second feature. A first feature being "below," "below," and "below" a second feature may include the first feature being directly below or obliquely below the second feature, or may simply mean that the first feature is lower in level than the second feature.

[0034] In the description of this embodiment, the terms "upper," "lower," "right," and other orientations or positional relationships are based on the orientations or positional relationships shown in the accompanying drawings and are intended solely for ease of description and simplified operation. They do not indicate or imply that the devices or components referred to must have a specific orientation, be constructed, or operate in a specific orientation. Therefore, they should not be construed as limitations on the present invention. Furthermore, the terms "first" and "second" are used solely for descriptive purposes and have no special meaning.

[0035] This embodiment provides a single-screw compressor comprising a housing, a screw disposed within the housing, and two planetary gear structures described in any of the embodiments of this embodiment. The two planetary gear structures are disposed on opposite sides of the screw and mesh with the screw. Through the continuous meshing of the planetary gear structures and the screw, gas enters from one side and is continuously compressed by the planetary gear structures and the screw, and then flows out from the other side, thereby achieving gas compression.

[0036] The single-screw compressor adopts the planetary wheel structure in this embodiment, which is more conducive to the establishment of a dynamic pressure oil film, and blocks the connection between the lubricating oil flow chamber at the tooth root and the lubricating oil flow chamber at the tooth top, thereby reducing the end leakage of lubricating oil, improving the stability of the oil film pressure at the meshing point between the planetary wheel structure and the screw, preventing the wear of the planetary wheel pieces caused by oil film rupture, and improving the service life of the single-screw compressor.

[0037] In some embodiments, the screw is provided with a spiral groove, and the star gear teeth 20 of the star gear structure are meshed and connected with the spiral groove to realize the entry, compression and outflow of gas. At the same time, when the single-screw compressor is running, an oil film is formed between the star gear teeth 20 and the spiral groove to ensure lubrication between the two and improve the service life of the single-screw compressor.

[0038] Please refer to Figure 1 Optionally, the meshing trajectory of the screw and the star wheel structure forms a screw helical surface 101, and the screw helical surface 101 meshes with the profile of the star wheel structure.

[0039] It should be noted that currently, the star wheel structure generally has a leakage triangle area 102 at the tooth root thereof, which causes lubricating oil to leak from this area, and may further cause wear between the star wheel structure and the spiral groove.

[0040] In order to solve this problem, this embodiment further provides a star wheel structure to form a blocking portion 22 to reduce the end leakage of lubricating oil.

[0041] Please refer to Figure 2 and Figure 3 Specifically, the star gear structure includes a main body 10 and a plurality of star gear teeth 20, and the plurality of star gear teeth 20 are sequentially arranged on the outer periphery of the main body 10; the side surface of the star gear tooth 20 includes two connected meshing surfaces 21, and the two meshing surfaces 21 are respectively connected to the two end surfaces 203 of the star gear tooth 20, and the meshing surface 21 located at the top can be enclosed with the spiral groove of the screw to form a lubricating oil flow chamber, and the volume of the lubricating oil flow chamber located at the tooth root is smaller than the volume of the lubricating oil flow chamber located at the tooth top, and a blocking portion 22 is provided between the lubricating oil flow chamber located at the tooth root and the lubricating oil flow chamber located at the tooth top.

[0042] The star wheel structure of this embodiment is achieved by setting the volume of the lubricating oil flow chamber at the tooth root to be smaller than the volume of the lubricating oil flow chamber at the tooth top, and providing a blocking portion 22 between the lubricating oil flow chamber at the tooth root and the lubricating oil flow chamber at the tooth top. This blocks the flow of lubricating oil toward the tooth root, thereby reducing the amount of oil leakage at the end, improving the stability of the oil film pressure, and preventing the oil film from rupturing and causing wear of the star wheel blades. At the same time, the volume of the lubricating oil flow chamber at the tooth top is larger, increasing the oil inlet area there, allowing the lubricating oil to flow more quickly from the oil hole into the convergent oil gap between the tooth top of the star wheel tooth 20 and the spiral groove, thereby facilitating the establishment of a dynamic pressure oil film between the tooth top of the star wheel tooth 20 and the spiral groove, thereby increasing the service life of the single-screw compressor.

[0043] Optionally, the angle between the two meshing surfaces 21 is an obtuse angle to form a contact line 23 , and the contact line 23 meshes with the helical surface of the screw, so that the meshing surface 21 and the screw mesh better.

[0044] In order to achieve that the inclination angle at the root of the meshing surface 21 at the top is smaller than the inclination angle at the top of the meshing surface 21 at the top, please refer to Figure 4 and Figure 5 In some optional embodiments, the inclination angle of the tooth root of the meshing surface 21 at the top is smaller than the inclination angle of the tooth top of the meshing surface 21 at the top to form a blocking portion 22, so that the lubricating oil is blocked when flowing toward the tooth root, so as to reduce the amount of oil flowing into the tooth root, thereby reducing the amount of lubricating oil leakage in the leakage triangle area 102 at the tooth root.

[0045] Please refer to Figure 4 Specifically, the meshing surface 21 at the top includes at least two connecting surfaces 211 arranged in sequence from the tooth root to the tooth top. Along the direction from the tooth root to the tooth top, the inclination angles of the at least two connecting surfaces 211 increase successively, so that a step-shaped blocking portion 22 is formed at the junction of two adjacent connecting surfaces 211. The blocking portion 22 is used to prevent the leakage of lubricating oil. This arrangement makes the meshing surface 21 arranged in an upward step-shaped manner along the direction from the tooth root to the tooth top, so that the flow of lubricating oil is blocked, reducing the amount of oil flowing into the tooth root, and thereby reducing the amount of lubricating oil leakage in the leakage triangle area 102 at the tooth root.

[0046] Optionally, two connecting surfaces 211 are provided, and a blocking portion 22 is formed at the junction of the two connecting surfaces 211, and the blocking portion 22 is arranged close to the tooth root, so that the blocking effect on the lubricating oil can be achieved without having to set too many, saving manufacturing costs, and also ensuring that there will be no problems when the meshing surface 21 engages with the spiral groove.

[0047] Please refer to Figure 5Optionally, along the direction from the tooth root to the tooth top, the inclination angle of at least one connecting surface 211 gradually increases from the side close to the tooth root toward the tooth top, so that a broken-line blocking portion 22 is formed at the junction of two adjacent connecting surfaces 211. That is, the inclination angle of the positioned meshing surface 21 along the direction from the tooth root to the tooth top gradually increases until a blocking portion 22 is formed at the junction of the two connecting surfaces 211, thereby obstructing the flow of lubricating oil. The junction between the two is also smoother, avoiding interference with other structures and causing wear on other structures, and facilitating meshing with the spiral groove.

[0048] In some specific embodiments, the side surfaces of the star gear teeth 20 include a front side surface 201 and a rear side surface 202, and the inclination angle at the root of the meshing surface 21 located at the top of at least one of the front side surface 201 and the rear side surface 202 is smaller than the inclination angle at the top of the meshing surface 21, that is, the change of the flow chamber volume at the meshing surface 21 of the side surface of the star gear can be achieved by changing at least one side surface.

[0049] More specifically, in this embodiment, in the front side surface 201 and the rear side surface 202 of the star gear tooth 20, the inclination angle at the root of the meshing surface 21 located at the top is smaller than the inclination angle at the top of the meshing surface 21 located at the top, ensuring that the volume of the lubricating oil flow chamber on both sides when meshing with the screw is reduced from the top to the root of the tooth, and also facilitating the blocking effect of the blocking part 22 on the lubricating oil, so that its anti-end leakage effect is better.

[0050] Optionally, the inclination angle at the tooth root of the meshing surface 21 at the top is α1, and the inclination angle at the tooth top of the meshing surface 21 at the top is α2, Δα=α2-α1, 5°≤Δα≤30°.

[0051] In some specific embodiments, the inclination angle at the root of the meshing surface 21 at the top is α1, the inclination angle at the top of the meshing surface 21 at the top is α2, and the inclination angle of the spiral groove is β, α1 = β + Δβ1, α2 = β + Δβ2, Δβ1 and Δβ2 are safety angles, generally ≥ 0.5°.

[0052] Obviously, the above-described embodiments of the present invention are merely examples for the purpose of clearly illustrating the present invention and are not intended to limit the manner in which the present invention is to be implemented. A person skilled in the art would be able to make various obvious changes, readjustments, and substitutions without departing from the scope of protection of the present invention. It is not necessary and impossible to enumerate all embodiments here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention shall be included within the scope of protection of the claims of the present invention.

Claims

1. Star wheel structure, characterized in that: The invention comprises a main body (10) and a plurality of star gear teeth (20), wherein the plurality of star gear teeth (20) are sequentially arranged on the outer periphery of the main body (10); the side surface of the star gear teeth (20) comprises two connected meshing surfaces (21), the two meshing surfaces (21) are respectively connected to the two end surfaces (203) of the star gear teeth (20), the meshing surface (21) located at the top can be combined with the spiral groove of the screw to form a lubricating oil flow chamber, the volume of the lubricating oil flow chamber located at the tooth root is smaller than the volume of the lubricating oil flow chamber located at the tooth top, and a blocking portion (22) is provided between the lubricating oil flow chamber located at the tooth root and the lubricating oil flow chamber located at the tooth top.

2. The star wheel structure according to claim 1, characterized in that: The inclination angle at the tooth root of the meshing surface (21) at the top is smaller than the inclination angle at the tooth top of the meshing surface (21) at the top, so as to form the blocking portion (22).

3. The star wheel structure according to claim 2, characterized in that: The meshing surface (21) located at the top includes at least two connecting surfaces (211) arranged in sequence from the tooth root to the tooth top, and the inclination angles of at least two connecting surfaces (211) increase in sequence along the direction from the tooth root to the tooth top, so that a step-shaped blocking portion (22) is formed at the junction of two adjacent connecting surfaces (211), and the blocking portion (22) is used to prevent leakage of lubricating oil.

4. The star wheel structure according to claim 3, characterized in that: Along the direction from the tooth root to the tooth top, the inclination angle of at least one of the connecting surfaces (211) gradually increases from the side close to the tooth root toward the side close to the tooth top, so that the junction of two adjacent connecting surfaces (211) forms a broken line-shaped blocking portion (22).

5. The star wheel structure according to claim 4, characterized in that: Two connecting surfaces (211) are provided, and the blocking portion (22) between the two connecting surfaces (211) is arranged close to the tooth root.

6. The star wheel structure according to claim 2, characterized in that: The side surfaces of the star gear teeth (20) include a front side surface (201) and a rear side surface (202), and the inclination angle at the tooth root of the meshing surface (21) located at the top of at least one of the front side surface (201) and the rear side surface (202) is smaller than the inclination angle at the tooth top of the meshing surface (21) located at the top.

7. The star wheel structure according to claim 2, characterized in that: The inclination angle at the tooth root of the meshing surface (21) at the top is α1, and the inclination angle at the tooth top of the meshing surface (21) at the top is α2, Δα=α2-α1, 5°≤Δα≤30°.

8. The star wheel structure according to any one of claims 1 to 7, characterized in that: The angle between the two meshing surfaces (21) is an obtuse angle to form a contact line (23), and the contact line (23) meshes with the screw.

9. Single screw compressor, characterized in that, It comprises a casing, a screw arranged in the casing, and two star wheel structures according to any one of claims 1 to 8, wherein the two star wheel structures are symmetrically arranged on both sides of the screw and meshedly connected with the screw.

10. The single-screw compressor according to claim 9, characterized in that The screw rod is provided with a spiral groove, and the star gear teeth (20) of the star gear structure are meshedly connected with the spiral groove.

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