Roller and fluid machine

Abstract

The utility model provides a roller and a fluid machine. The roller comprises a roller body, a limiting groove is formed in the roller body, at least one part of the edge of at least one of the two ends of an opening of the limiting groove is cut off to form a cut edge, and burrs can be reduced by cutting off the edge of one end or the edges of the two ends of the limiting groove; after the limiting groove is formed, the edge of the limiting groove mostly forms a crescent structure similar to an acute angle, and after the edge of the limiting groove is cut off, a sharp and thin sharp edge can be prevented from being formed, so that the roller main body has a thick edge; meanwhile, by cutting off the edges of the limiting grooves, the parts where burrs are easily formed can be cut off, and the structural strength of the roller body can be improved. The utility model solves the problem that the reliability of the fluorine pump is influenced by burrs and sharp edges on the roller of the fluorine pump in the prior art.

Description

Technical Field

[0001] The utility model relates to the technical field of heat exchange equipment, and particularly to a roller and a fluid machine. Background Art

[0002] In recent years, fluorine pumps have been increasingly used in the field of air-conditioning compressors. Fluorine pumps have the advantages of small size, high efficiency, low noise, and high operating reliability. As the core component of an air-conditioning compressor, the performance of a fluorine pump directly affects the performance of the air-conditioning compressor. And the fluorine pump roller, as the core component of the fluorine pump, is a key factor affecting the performance of the fluorine pump. As a rotating component of the fluorine pump, the fluorine pump roller has to bear friction and wear during operation, and the friction and wear have a great impact on the life and performance of the roller. The material and structure of the roller directly affect the friction and wear. In China, 2414C or 20CrMnMo is often used for the material of fluorine pump rollers. In terms of structure, most rollers are provided with limiting grooves. The process of the limiting grooves is complex and has high precision requirements, and materials with relatively high hardness are mostly used. When machining the limiting grooves, it is easy to form burrs, flash and other problems that are not easy to remove at the edges of the limiting grooves. At the same time, most of the edges of the machined limiting grooves are acute edges, which affect the structural strength of the roller and further affect the reliability of the compressor.

[0003] Therefore, as can be seen from the above, there is a problem in the prior art that the burrs and sharp edges on the rollers of the fluorine pump affect the reliability of the fluorine pump. Summary of the Utility Model

[0004] The main purpose of the utility model is to provide a roller and a fluid machine to solve the problem in the prior art that the burrs and sharp edges on the rollers of the fluorine pump affect the reliability of the fluorine pump.

[0005] To achieve the above purpose, according to one aspect of the utility model, a roller is provided, including: a roller body, the roller body is provided with a limiting groove, and at least a part of the edge at at least one end of the opening of the limiting groove is cut off to form a cut edge.

[0006] Further, the limiting groove includes two limiting grooves arranged in sequence along the axial direction of the roller body, and at least one of the two limiting grooves is provided with a cut edge.

[0007] Further, the extending directions of the two limiting grooves are perpendicular; and / or both of the two limiting grooves have cut edges.

[0008] Further, the end edge of the limiting groove is U-shaped, and the cut edge is formed in the entire area of the U-shape; or the cut edge is formed in two opposite straight-edge areas of the U-shape.

[0009] Further, the end edge of the limiting groove is U-shaped, and a trimming edge is formed in the entire U-shaped area. The trimming edge includes a straight trimming edge segment and an arc trimming edge segment. Among them, the included angle A between the straight trimming edge segment on the two opposite straight edge areas of the U-shaped and the arc trimming edge segment on the arc area of the U-shaped satisfies: 90° < A < 150°.

[0010] Further, the straight edge area and the arc area are in arc transition.

[0011] Further, the end edge of the limiting groove is U-shaped, and a trimming edge is formed in the entire U-shaped area. The trimming edge includes a straight trimming edge segment and an arc trimming edge segment. Among them, the vertical distance H1 from the lowest point P1 of the arc trimming edge segment on the arc area of the U-shaped to the axial end face of the roller body on the side where the limiting groove is located, and the distance H2 from the bottom of one limiting groove to the axial end face of the roller body on the side where the other limiting groove is located satisfy: 0 < H1 ≤ 0.9 * H2.

[0012] Further, the trimming edge includes a straight trimming edge segment and an arc trimming edge segment. Taking the tangential plane at the outer surface of the roller body where the lowest point P1 of the arc trimming edge segment on the arc area of the U-shaped is located as the reference plane, the vertical distance L from the straight edge area to the reference plane, and the outer diameter D1 of the roller body satisfy: 0 < L < 0.4 * D1.

[0013] Further, the straight edge area extends to the axial end face of the roller body on the side where the limiting groove is located.

[0014] Further, trimming edges are provided at both ends of the limiting groove, and the trimming edges at both ends have the same shape.

[0015] According to another aspect of the present invention, a fluid machine is provided, including the above-mentioned roller.

[0016] Further, the fluid machine is a fluorine pump.

[0017] Applying the technical solution of the present invention, the roller includes a roller body, and a limiting groove is opened on the roller body. At least a part of the edge at at least one end of the opening of the limiting groove is cut off to form a trimming edge. By cutting off the edge at one end or both ends of the limiting groove, burr generation can be reduced. The roller body is generally a columnar structure. After the limiting groove is opened, the edge of the limiting groove mostly forms a crescent structure with an approximate acute angle. After cutting off the edge of the limiting groove, a sharp and thin edge can be avoided, so that the roller body has a thicker edge. At the same time, cutting off the edge of the limiting groove can not only cut off the part that is easy to form burrs but also improve the structural strength of the roller body, solving the problem that the burrs and sharp edges on the roller of the fluorine pump in the prior art affect the reliability of the fluorine pump. Description of the Drawings

[0018] The accompanying drawings forming a part of this application are used to provide a further understanding of the present utility model. The schematic embodiments and descriptions thereof of the present utility model are used to explain the present utility model and do not constitute an improper limitation to the present utility model. In the drawings:

[0019] Figure 1 A schematic structural diagram of a roller in a specific embodiment of the present utility model is shown;

[0020] Figure 2 A schematic structural diagram of the cooperation between a roller and a slider in a specific embodiment of the present utility model is shown;

[0021] Figure 3 A dimensional drawing of a roller body in a specific embodiment of the present utility model is shown;

[0022] Figure 4 A schematic structural diagram of a roller in another specific embodiment of the present utility model is shown;

[0023] Figure 5 An exploded view of a fluid machine in a specific embodiment of the present utility model is shown;

[0024] Figure 6 A schematic assembly structural diagram of a roller and a cylinder in a specific embodiment of the present utility model is shown.

[0025] Among them, the above-mentioned drawings include the following reference numerals:

[0026] 10. Roller body; 11. Limit groove; 111. Straight-edge area; 112. Arc area; 12. Cut edge; 121. Straight cut-edge segment; 122. Arc cut-edge segment; 20. Slider; 30. Crankshaft; 31. Shaft body; 32. Eccentric part; 40. Cylinder; 41. Liquid suction channel; 42. Liquid discharge channel; 50. Upper flange; 60. Lower flange. Detailed implementation manners

[0027] Next, the technical solutions in the embodiments of the present utility model will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all the embodiments. The following description of at least one exemplary embodiment is actually only illustrative and in no way constitutes a limitation to the present utility model and its application or use. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present utility model.

[0028] In order to solve the problem that burrs and sharp edges on the rollers of a fluorine pump in the prior art affect the reliability of the fluorine pump, the present utility model provides a roller and a fluid machine.

[0029] As shown Figures 1 to 6 in the figure, the roller includes a roller body 10. A limiting groove 11 is formed in the roller body 10. At least a part of the edge at at least one end of the opening of the limiting groove 11 is cut off to form a cut edge 12.

[0030] By cutting off the edge at one or both ends of the limiting groove 11, the generation of burrs can be reduced. The roller body 10 is generally a columnar structure. After the limiting groove 11 is formed, the edge of the limiting groove 11 mostly forms a crescent structure with an approximate acute angle. After cutting off the edge of the limiting groove 11, a sharp and thin edge can be avoided, so that the roller body 10 has a thicker edge. At the same time, cutting off the edge of the limiting groove 11 can not only cut off the part that is easy to form burrs but also improve the structural strength of the roller body 10. When the roller is assembled with other parts of the fluid machinery, the reliability of the fluid machinery can be ensured.

[0031] In this embodiment, the limiting groove 11 includes two limiting grooves 11 arranged in sequence along the axial direction of the roller body 10. At least one of the two limiting grooves 11 is provided with a cut edge 12.

[0032] Specifically, as shown Figure 2 and Figure 6 in the figure, when the limiting groove 11 cooperates with the slider 20, the slider 20 slides in the limiting groove 11, dividing the entire limiting groove 11 into two parts. Compared with the roller without the cut edge 12, the volume of the two volume chambers of the present application increases. At the same time, after the cut edge 12 is provided, the roller body 10 will not wear the slider 20 or other components during use. Setting two limiting grooves 11 can form four volume chambers, thereby improving the compression efficiency.

[0033] In this embodiment, the extending directions of the two limiting grooves 11 are perpendicular. Both of the two limiting grooves 11 have cut edges 12.

[0034] Specifically, the two limiting grooves 11 are located on the upper and lower sides of the roller body 10, and cut edges 12 are provided at both ends of the two limiting grooves 11, so that two of the four volume chambers are in the exhaust compression state, and the other two volume chambers are in the suction state. And the perpendicular extending directions of the two limiting grooves 11 can avoid stress concentration on the roller and prevent the structural strength of the roller from being too low and causing fracture.

[0035] As shown Figure 1 and Figure 4 in the figure, the end edge of the limiting groove 11 is U-shaped, and the cut edge 12 is formed in the entire area of the U-shape, or the cut edge 12 is formed in two opposite straight-edge areas 111 of the U-shape.

[0036] Specifically, when the trimming edge 12 is formed in the entire U-shaped area, one end edge of the limiting groove 11 is completely removed, thereby forming a trimming edge 12 in an approximate U-shape. Both the straight edge area 111 and the arc area 112 are partially removed, and the entire U-shape is directly removed from the roller body 10 during the removal process.

[0037] In another specific embodiment of the present application, as shown in the attached Figure 4 figure, the formation of the trimming edge 12 is only at the straight edge area 111. Since flash burrs are mainly concentrated in the straight edge area 111, by removing a part of the straight edge area 111, the burrs can be removed while accelerating the processing efficiency. Compared with the method of completely removing one end of the limiting groove 11, only removing the straight edge area 111 is faster in processing. This is because the materials used for the roller body 10 are all materials with relatively high hardness, and the time and process required to remove the entire U-shape are more complex, while the method of forming the trimming edge by removing the straight edge area 111 is simpler.

[0038] In this embodiment, the end edge of the limiting groove 11 is in a U-shape, and the trimming edge 12 is formed in the entire U-shaped area. The trimming edge 12 includes a straight trimming edge segment 121 and an arc trimming edge segment 122. Among them, the included angle A between the straight trimming edge segment 121 on the two opposite straight edge areas 111 of the U-shape and the arc trimming edge segment 122 on the arc area 112 of the U-shape satisfies: 90° < A < 150°.

[0039] Specifically, the included angle A between the straight trimming edge segment 121 and the arc trimming edge segment 122 formed after completely removing the straight edge area 111 and the arc area 112 at the end of the limiting groove 11 is between 90° and 150°. The included angle A within the above range can ensure that the roller body 10 plays a sufficient role. If the included angle A is less than 90° or greater than 150°, that is, too large or too small, burrs and flash will be generated on the straight edge area 111 and the arc area 112, affecting the quality of the part. Optionally, the included angle A is 120° or 130°.

[0040] In this embodiment, the straight edge area 111 and the arc area 112 are in arc transition.

[0041] Specifically, an arc is provided between the straight edge area 111 and the arc area 112. When the trimming edge 12 is formed, an arc will also be formed between the straight trimming edge segment 121 and the arc trimming edge segment 122, and the trimming edge 12 has a smoother transition, avoiding the accumulation of debris at the transition position between the two areas.

[0042] In this embodiment, the end edge of the limiting groove 11 is U-shaped, and the cutting edge 12 is formed in the entire U-shaped area. The cutting edge 12 includes a straight cutting edge segment 121 and an arc cutting edge segment 122. Among them, the vertical distance H1 from the lowest point P1 of the arc cutting edge segment 122 on the arc area 112 of the U shape to the axial end face of the roller body 10 on the side where the limiting groove 11 is located, and the distance H2 from the bottom of one limiting groove 11 to the axial end face of the roller body 10 on the side where the other limiting groove 11 is located satisfy: 0 < H1 ≤ 0.9 * H2.

[0043] Specifically, as Figure 3 shown, if the distance from the lowest point P1 on the arc cutting edge segment 122 to the top surface of the limiting groove 11 is too large or too small, the volume of the volume chamber will change. At the same time, the above relationship is also to ensure the solid thickness between the upper and lower limiting grooves 11. If it exceeds this size, the angle A is an acute angle, which will cause burrs and flash on the straight edge area 111 and the arc area 112, affecting the part quality. Roller bodies 10 of different size types only need to satisfy the above relationship to achieve the same effect as this application.

[0044] In this embodiment, the cutting edge 12 includes a straight cutting edge segment 121 and an arc cutting edge segment 122. Taking the tangential plane at the outer surface of the roller body 10 where the lowest point P1 of the arc cutting edge segment 122 on the arc area 112 of the U shape is located as the reference plane, the vertical distance L from the straight edge area 111 to the reference plane, and the outer diameter of the roller body 10 is D1. Among them, L and D1 satisfy: 0 < L < 0.4 * D1.

[0045] Specifically, when the size of the roller body 10 is different, only by satisfying the above relationship can the cutting edge 12 play a role. If L is too large, the clearance volume generated by the cutting edge will increase, affecting the volumetric efficiency of the subsequent fluorine pump.

[0046] In this embodiment, the straight edge area 111 extends to the axial end face of the roller body 10 on the side where the limiting groove 11 is located.

[0047] Specifically, the straight edge area 111 is the area where the straight edge of the limiting groove 11 is located. When forming the cutting edge 12, the straight cutting edge segment 121 is adapted to the entire straight edge area 111, or slightly larger than the straight edge area 111. When the cutting edge 12 is formed in the straight edge area 111, the straight cutting edge segment 121 is the same as the straight edge area 111, as shown in the appendix Figure 4 shown.

[0048] In this embodiment, cutting edges 12 are provided at both ends of the limiting groove 11, and the shapes of the cutting edges 12 at both ends are the same.

[0049] Specifically, providing cutting edges 12 at both ends of the two limiting grooves 11 can increase the volumes of the two volume chambers.

[0050] In another embodiment (not shown) of the present application, a cutting edge 12 is formed at one end of the limiting groove 11, and the cutting edge 12 is formed in the entire area of the U shape. A cutting edge 12 is also formed at the other end of the limiting groove 11, and the cutting edge 12 is formed in two opposite straight-edge areas 111 of the U shape.

[0051] As Figures 5 to 6 shown, the fluid machine includes the above-mentioned roller.

[0052] Specifically, the fluid machine further includes a slider 20, a crankshaft 30, a cylinder 40, an upper flange 50, and a lower flange 60. There are two sliders 20, and the two sliders 20 are respectively arranged in the two limiting grooves 11, and corresponding through holes are provided on the two sliders 20 and the roller body 10; the crankshaft 30 is inserted through the roller body 10 and the slider 20. The crankshaft 30 includes a shaft body 31 and eccentric parts 32. There are two eccentric parts 32, and the two eccentric parts 32 are arranged on the shaft body 31 and are correspondingly arranged with the two sliders 20. The roller body 10 is accommodated in the accommodation cavity of the cylinder 40, and the upper flange 50 and the lower flange 60 are respectively arranged at both ends of the cylinder 40.

[0053] After the roller body 10 is accommodated in the accommodation cavity, the roller body 10 abuts against the inner wall of the accommodation cavity. The slider 20 slides in the limiting groove 11 to divide the limiting groove 11 into two variable-volume cavities. When the crankshaft 30 rotates, the slider 20 reciprocates in the limiting groove 11, and the volumes of the two variable-volume cavities change continuously. When the volume of one variable-volume cavity becomes smaller, the volume of the other variable-volume cavity becomes larger. A liquid suction channel 41 and a liquid discharge channel 42 are provided on the cylinder 40. When the slider 20 moves to drive the change of the volumes of the two variable-volume cavities, the coolant is sucked into the variable-volume cavity in the liquid suction state. When this volume cavity is gradually communicated with the liquid discharge channel 42, the coolant is compressed in this process and finally discharged from the liquid discharge channel 42.

[0054] Since two limiting grooves 11 are provided on the roller body 10 and two sliders 20 are correspondingly arranged, during the process that the crankshaft 30 drives the two sliders 20 to move through the two eccentric parts 32 and then drives the roller body 10 to rotate, single-cylinder four-compression is realized, that is, two of the four variable-volume cavities are in the compression state, and the other two are in the liquid suction state, thereby greatly improving the compression efficiency.

[0055] In this embodiment, the fluid machine is a fluorine pump.

[0056] Specifically, when the above-mentioned roller is used in a fluorine pump, since the fluorine pump compresses a liquid coolant, and the liquid coolant is a liquid rather than a gas, after the trimming edge 12 is provided, the volume of the volume chamber formed by the limiting groove 11 will increase. For a compressor with a gas as the working medium, this increased volume will greatly affect the volumetric efficiency. However, due to the incompressible property of the liquid, it will have no impact on the fluorine pump that compresses the liquid coolant. Moreover, the volume change rate of the compression chamber of the fluorine pump changes periodically, and the operating torque is stable. The roller with the trimming edge 12 is more suitable for the fluorine pump.

[0057] Applying the technical solution of the present utility model, by providing that the roller includes a roller body 10, a limiting groove 11 is opened in the roller body 10, and at least a part of the edge of at least one end of the opening of the limiting groove 11 is cut off to form a trimming edge 12. By cutting off the edge of one end or both ends of the limiting groove 11, burr generation can be reduced. The roller body 10 is generally a columnar structure. After the limiting groove 11 is opened, the edge of the limiting groove 11 mostly forms a crescent structure with an approximate acute angle. After cutting off the edge of the limiting groove 11, a sharp and thin edge can be avoided, so that the roller body 10 has a thicker edge. At the same time, cutting off the edge of the limiting groove 11 can not only cut off the part that is likely to form burrs but also improve the structural strength of the roller body 10. When the roller is assembled with other parts of the fluid machinery, the reliability of the fluid machinery can be ensured.

[0058] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present application. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprising" and / or "including" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0059] Unless otherwise specifically stated, the relative arrangements of the components and steps, numerical expressions, and numerical values set forth in these embodiments do not limit the scope of the present utility model. At the same time, it should be understood that for the sake of description, the dimensions of the various parts shown in the drawings are not drawn in actual proportional relationships. Technologies, methods, and devices known to those of ordinary skill in the relevant art may not be discussed in detail, but where appropriate, the technologies, methods, and devices should be regarded as part of the authorized specification. In all the examples shown and discussed here, any specific value should be construed as merely exemplary and not as a limitation. Therefore, other examples of the exemplary embodiments may have different values. It should be noted that: like reference numerals and letters denote like items in the following drawings. Therefore, once an item is defined in one drawing, it does not need to be further discussed in subsequent drawings.

[0060] In the description of the present utility model, it should be understood that the orientation or positional relationships indicated by orientation terms such as "front, rear, upper, lower, left, right", "lateral, vertical, perpendicular, horizontal" and "top, bottom", etc. are usually based on the orientation or positional relationships shown in the drawings. It is only for the convenience of describing the present utility model and simplifying the description. Without contrary explanations, these orientation terms do not indicate and imply that the devices or elements referred to must have a specific orientation or be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation on the protection scope of the present utility model; the orientation terms "inside, outside" refer to the inside and outside relative to the contour of each component itself.

[0061] For the convenience of description, spatial relative terms can be used here, such as "above...", "over...", "on the upper surface of...", "upper...", etc., to describe the spatial positional relationship between a device or feature shown in the figure and other devices or features. It should be understood that the spatial relative terms are intended to include different orientations in use or operation in addition to the orientation described in the figure for the device. For example, if the device in the drawing is inverted, the device described as "above other devices or structures" or "over other devices or structures" will then be positioned as "below other devices or structures" or "under other devices or structures". Thus, the exemplary term "above..." can include both the orientations of "above..." and "below...". The device can also be positioned in other different ways, rotated 90 degrees or in other orientations, and corresponding interpretations are made for the spatial relative descriptions used here.

[0062] In addition, it should be noted that using terms such as "first", "second", etc. to limit components is only for the convenience of distinguishing the corresponding components. Without additional statements, the above terms have no special meanings. Therefore, it should not be construed as a limitation on the protection scope of the present utility model.

[0063] It should be noted that the terms used here are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present application. As used here, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should also be understood that when the terms "comprise" and / or "include" are used in this specification, it indicates the presence of features, steps, operations, devices, components and / or combinations thereof.

[0064] It should be noted that the terms "first", "second", etc. in the specification, claims and above-mentioned drawings of the present application are used to distinguish similar objects and do not necessarily need to describe a specific order or sequence. It should be understood that such used data can be interchanged under appropriate circumstances so that the embodiments of the present application described here can be implemented in an order other than those illustrated or described here.

[0065] The above are only the preferred embodiments of the present utility model and are not intended to limit the present utility model. For those skilled in the art, various modifications and variations can be made to the present utility model. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present utility model shall be included within the protection scope of the present utility model.

Claims

1. A roller, characterized in that: include: A roller body (10) is provided with a limiting groove (11), and at least a portion of the edge of at least one of the two ends of the opening of the limiting groove (11) is cut off to form a cut edge (12).

2. The roller according to claim 1, characterized in that The limiting groove (11) comprises two limiting grooves (11) arranged in sequence along the axial direction of the roller body (10), and at least one of the two limiting grooves (11) is provided with the cutting edge (12).

3. The roller according to claim 2, characterized in that The extension directions of the two limiting grooves (11) are perpendicular; and / or Both of the two limiting grooves (11) have the cutting edge (12).

4. The roller according to claim 1, characterized in that The end edge of the limiting groove (11) is U-shaped. The cutting edge (12) is formed in the entire area of ​​the U-shape; or The cut edges (12) are formed at two opposite straight edge regions (111) of the U-shape.

5. The roller according to claim 1, characterized in that The end edge of the limiting groove (11) is U-shaped, the cutting edge (12) is formed in the entire area of ​​the U-shape, and the cutting edge (12) includes a straight cutting edge segment (121) and an arc-shaped cutting edge segment (122), wherein the included angle A between the straight cutting edge segment (121) on two opposite straight edge areas (111) of the U-shape and the arc-shaped cutting edge segment (122) on the arc-shaped area (112) of the U-shape satisfies: 90° <A<150°。 6. The roller according to claim 5, characterized in that The straight edge area (111) and the arc-shaped area (112) transition in a circular arc.

7. The roller according to claim 2, characterized in that The end edge of the limiting groove (11) is U-shaped, and the cutting edge (12) is formed in the entire area of ​​the U-shape, and the cutting edge (12) includes a straight cutting edge segment (121) and an arc-shaped cutting edge segment (122), wherein the vertical distance from the lowest point P1 of the arc-shaped cutting edge segment (122) on the arc-shaped area (112) of the U-shape to the axial end surface of the roller body (10) on the side where the limiting groove (11) is located is H1, and the distance from the bottom of one limiting groove (11) to the axial end surface of the roller body (10) on the side where the other limiting groove (11) is located is H2, and H1 and H2 satisfy: <H1≤0.9*H2。 8. The roller according to claim 4, characterized in that The cutting edge (12) comprises a straight cutting edge segment (121) and an arc-shaped cutting edge segment (122); a tangential plane at the outer surface of the roller body (10) at which the lowest point P1 of the arc-shaped cutting edge segment (122) on the U-shaped arc-shaped region (112) is located is used as a reference plane; a vertical distance from the straight cutting edge segment (121) on the straight edge region (111) to the reference plane is L; and an outer diameter of the roller body (10) is D1, wherein L and D1 satisfy: <L<0.4*D1。 9. The roller according to claim 4, characterized in that The straight edge area (111) extends to the axial end surface of the roller body (10) on the side where the limiting groove (11) is located.

10. The roller according to any one of claims 1 to 9, characterized in that The cutting edges (12) are provided at both ends of the limiting groove (11), and the cutting edges (12) at the two ends have the same shape.

11. A fluid machine, characterized in that: The roller comprising any one of claims 1 to 10.

12. The fluid machine according to claim 11, characterized in that: The fluid machinery is a fluorine pump.

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