Pump body assembly and rolling piston compressor

Abstract

Provided is a pump body assembly. The pump body assembly includes a cylinder (1). The cylinder (1) includes a cylinder body (11) provided with a cut portion (111) and a first cavity (12). The cylinder body (11) is. The cylinder body (11) surrounds and defines the first cavity (12). One end of the cut portion (111) extends to the inner wall of the cylinder body (11). The other end of the cut portion (111) extends to an exhaust side (112) of the cylinder (1). The maximum distance between an edge of the cut portion (111) and the inner wall of the cylinder body (11) is b. The thickness of the cylinder body (11) is B. 0 < b / B ≤ 0.2.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of compressors, for example, a pump body assembly and a rolling piston compressor.BACKGROUND

[0002] A compressor is a type of driven fluid machinery that elevates a low-pressure gas to a high-pressure gas. Compressors include reciprocating compressors and rotary compressors. Among the reciprocating compressors, rolling piston compressors are commonly used considering various advantages such as simple structure, excellent performance, and low cost. A rolling piston compressor uses the rotational force of a motor to compress a low-pressure gas into a high-pressure gas to be discharged. The rolling piston compressor mainly consists of a housing, a motor, a crankshaft, a piston, a cylinder, and a blade. The piston is located inside the cylinder. When the crankshaft rotates about the center of rotation, the piston rotates against the inner surface of the cylinder. Accordingly, a crescent-shaped space is formed between the outer surface of the piston and the inner surface of the cylinder.

[0003] It is a trend to develop small-series compressors with larger displacement instead of large-series compressors. However, in the related art, a cylinder exhaust side cut of a rolling piston compressor typically adopts an arc-shaped cut as shown in FIG. 7. Such an arrangement fails to fully utilize the compression volume between a cylinder exhaust side and an exhaust port, making it difficult to enhance the effective volume of the rolling piston compressor and resulting in relatively low volumetric efficiency and relatively small displacement. Additionally, during exhaust, the rolling piston compressor generates noise due to exhaust and pulsation, also increasing power consumption.SUMMARY

[0004] The present application provides a pump body assembly, reducing clearance volume, improving volume efficiency, and reducing noise.

[0005] A pump body assembly is provided. The pump body assembly includes a cylinder. The cylinder includes a cylinder body provided with a cut portion and a first cavity. The cylinder body surrounds and defines the first cavity. One end of the cut portion extends to an inner wall of the cylinder body. The other end of the cut portion extends to an exhaust side of the cylinder. A maximum distance between an edge of the cut portion and the inner wall of the cylinder body is b. A thickness of the cylinder body is B. 0 < b / B ≤ 0.2.

[0006] Optionally, a length of the cut portion is L. 0 < b / L ≤ 0.37.

[0007] Optionally, a central angle β at which two side edges of the cut portion in a length direction are located satisfies that 0° ≤ β ≤ 23°.

[0008] Optionally, an angle θ between a tangent line of an edge of the cut portion radially away from an inner center of the cylinder body and a horizontal plane satisfies that 0 < θ ≤ 45°.

[0009] Optionally, a depth of the cut portion intersecting the inner wall of the cylinder body is h. A depth of the cylinder body is H. h ≤ b. h ≤ H.

[0010] Optionally, a cutting surface line of the cut portion is formed by a straight line, or cutting surface lines of the cut portion are formed by a plurality of straight lines, or a cutting surface line of the cut portion is formed by a curve, or cutting surface lines of the cut portion are formed by a straight line and a curve.

[0011] Optionally, the pump body assembly further includes a cylinder cover. The cylinder cover is connected to the exhaust side of the cylinder body. The cylinder cover is provided with an exhaust hole. The exhaust hole penetrates the cylinder cover. An axial direction of the exhaust hole is perpendicular to the exhaust side. At least part of the exhaust hole communicates with the first cavity. The cut portion communicates with the exhaust hole.

[0012] Optionally, a diameter of the exhaust hole is D. A maximum distance between any two points of the cut portion is L. 0 < L ≤ D.

[0013] Optionally, a cross section of the exhaust hole is circular or D-shaped.

[0014] The present application further provides a rolling piston compressor, including the preceding pump body assembly.BRIEF DESCRIPTION OF DRAWINGS

[0015] FIG. 1 is diagram one illustrating the structure of a cylinder according to embodiment one of the present application. FIG. 2A is diagram two illustrating the structure of the cylinder according to embodiment one of the present application. FIG. 2B is diagram three illustrating the structure of the cylinder according to embodiment one of the present application. FIG. 3 is a diagram illustrating part of the structure of the cylinder according to embodiment one of the present application. FIG. 4 is diagram one illustrating the assembly of the cylinder and a cylinder cover according to embodiment one of the present application. FIG. 5 is diagram two illustrating the assembly of the cylinder and the cylinder cover according to embodiment one of the present application. FIG. 6 is a comparison diagram illustrating noise peak values at different operating frequencies between a rolling piston compressor according to embodiment two of the present application and a rolling piston compressor in the related art. FIG. 7 is a diagram of the structure of a cylinder in the related art. Reference list

[0016] 1cylinder 11cylinder body 111cut portion 112exhaust side 12first cavity 2cylinder cover 21exhaust hole DETAILED DESCRIPTION

[0017] The present application is described below in conjunction with the drawings and embodiments. It is to be understood that the embodiments described herein are intended to illustrate the present application and not to limit the present application. In addition, for ease of description, only part, not all, of structures related to the present application are illustrated in the drawings.

[0018] In the description of the present application, terms "joined", "connected", and "secured" are to be understood in a broad sense unless otherwise expressly specified and limited. For example, the term "connected" may refer to "securely connected", "detachably connected", or "integrated", may refer to "mechanically connected" or "electrically connected", may refer to "connected directly" or "connected indirectly through an intermediary", or may refer to "connected inside two components" or "an interaction relation between two components". For those of ordinary skill in the art, specific meanings of the preceding terms in the present application may be understood based on specific situations.

[0019] In the present application, unless otherwise expressly specified and limited, when a first feature is described as "on" or "under" a second feature, the first feature and the second feature may be in direct contact or may be in indirect contact via another feature between the two features instead of being in direct contact. Moreover, when the first feature is described as "on", "above", or "over" the second feature, the first feature is right on, above, or over the second feature, the first feature is obliquely on, above, or over the second feature, or the first feature is simply at a higher level than the second feature. When the first feature is described as "under", "below", or "underneath" the second feature, the first feature is right under, below, or underneath the second feature, the first feature is obliquely under, below, or underneath the second feature, or the first feature is simply at a lower level than the second feature.

[0020] In the description of this embodiment, orientations or position relations indicated by terms such as "upper", "lower", "left", and "right" are based on the drawings. These orientations or position relations are intended only to facilitate description and simplify an operation and not to indicate or imply that a device or element referred to must have such particular orientations or must be configured or operated in such particular orientations. Thus, these orientations or position relations are not to be construed as limiting the present application. Additionally, terms "first" and "second" are used only for the distinguishing purpose and have no special meanings.Embodiment one

[0021] As shown in FIGS. 1 to 5, this embodiment provides a pump body assembly. The pump body assembly includes a cylinder 1. The cylinder 1 includes a cylinder body 11 and a first cavity 12, where the cylinder body 11 surrounds and defines the first cavity 12. That is, as shown in FIGS. 1 and 2A, the cylinder body 11 is annular. The inner wall of the cylinder body 11 surrounds and defines the first cavity 12. The cylinder 1 provided in this embodiment is further provided with at least one suction hole communicating with the first cavity 12. When a rolling piston compressor is in operation, a gas enters the first cavity 12 through the at least one suction hole and is compressed. The compressed high-pressure gas is exhausted through an exhaust side 112 of the cylinder 1.

[0022] The cylinder body 11 is provided with a cut portion 111. One end of the cut portion 111 extends to the inner wall of the cylinder body 11. The other end of the cut portion 111 extends to the exhaust side 112 of the cylinder 1. That is, the cut portion 111 communicates with the first cavity 12 and intersects the exhaust side 112 of the cylinder 1. The high-pressure gas in the first cavity 12 is exhausted through the cut portion 111 and the exhaust side 112 of the cylinder 1, widening the exhaust passage of the high-pressure gas, rationally utilizing the compression volume between the exhaust side 112 of the cylinder 1 and an exhaust port, reducing clearance volume, and improving volume efficiency.

[0023] As shown in FIG. 3, in the present application, the ratio b / B of the radial length of the cut portion 111 to the thickness of the cylinder body 11 can be controlled to effectively improve volumetric efficiency and reduce noise. The maximum distance between an edge of the cut portion 111 and the inner wall of the cylinder body 11 is b. The thickness of the cylinder body 11 is B. The dimension parameters of the cut portion 111 are defined in this embodiment. For example, the maximum distance between the edge of the cut portion 111 and the inner wall of the cylinder body 11 is set to B, and the thickness of the cylinder body 11 is set to B. In this embodiment, it is defined that 0 < b / B ≤ 0.2. The ratio of the radial dimension of the cut portion 111 (the maximum distance between the edge of the cut portion 111 and the inner wall of the cylinder body 11)to the thickness of the cylinder body 11 is much less than the corresponding ratio of an exhaust cut in the related art, effectively reducing the overall clearance volume of the cylinder 1, improving volume efficiency, and reducing noise.

[0024] As shown in FIG. 2B, the length of the cut portion 111 is set to L in this embodiment of the present application. To guarantee exhaust capacity, b and L satisfy that 0 < b / L ≤ 0.37. In FIG. 2B, the angle between the central axis of a blade groove and the cut portion 111 is α. α satisfies that 4°≤ α ≤ 23°.

[0025] Optionally, the central angle β at which two side edges of the cut portion 111 in the length direction are located satisfies that 0° ≤ β ≤ 23°. The design of the aspect ratio of the cut portion 111 reduces clearance volume and effectively reduce the noise peak value during the operation of the compressor, especially the noise peak value at the operation frequency of 1250 Hz.

[0026] In this embodiment of the present application, the depth of the cut portion 111 intersecting the inner wall of the cylinder body 11 is set to h, and the depth of the cylinder body 11 is set to H. In this embodiment, it is defined that h ≤ b and that h ≤ H. The depth of the cut portion 111 is kept within this range, controlling the overall clearance volume range of the cylinder 1. The high-pressure gas has a sufficient guide depth, enabling the high-pressure gas in the cylinder 1 to be exhausted smoothly and improving the reliability of the compressor.

[0027] As shown in FIG. 3, the angle between the tangent line of an edge of the cut portion 111 radially away from the inner center of the cylinder body 11 and the horizontal plane is θ. 0 < θ ≤ 45°. The overall clearance volume range of the cylinder 1 is controlled by defining the dimension of the cut portion 111.

[0028] Optionally, the cut portion 111 in this embodiment is formed by cutting. Exemplarily, a cutting surface line of the cut portion 111 is a straight line, and the shape of a cutting surface at any point of the cut portion 111 is the same right triangle. Alternatively, cutting surface lines of the cut portion are several straight lines; that is, the shape of a cutting surface at any point of the cut portion 111 is a right triangle, and the shapes of cutting surfaces at different points of the cut portion 111 are not exactly the same. Alternatively, a cutting surface line of the cut portion 111 is a curve, for example, a smooth curve or an irregular curve. Alternatively, cutting surface lines of the cut portion are a combination of a straight line and a curve. This embodiment does not make a limitation hereto. In this embodiment, the cut portion 111 is chamfered. For example, the cut portion 111 is a triangular chamfer and satisfies that 0 < θ ≤ 45°. A cutting surface line is usually used for indicating the section of a component. It is a kind of contour line for indicating the shape and dimension of a section or cutting surface of a component, facilitating actual processing and production operations.

[0029] As shown in FIGS. 4 and 5, the pump body assembly provided in this embodiment further includes a cylinder cover 2. The cylinder cover 2 is connected to the cylinder body 11. One side of the cylinder cover 2 is attached to the exhaust side 112 of the cylinder body 11. The cylinder cover 2 is provided with an exhaust hole 21. The exhaust hole 21 penetrates the cylinder cover 2. At least part of the exhaust hole 21 can communicate with the first cavity 12. The cut portion 111 communicates with the exhaust hole 21. That is, the high-pressure gas can be exhausted from the exhaust hole 21. The axial direction of the exhaust hole 21 is perpendicular to the exhaust side, helping the high-pressure gas in the cylinder 1 be exhausted smoothly.

[0030] The first cavity 12 is circular. Adaptively, the cross section of the exhaust hole 21 is circular or D-shaped to match the cut portion 111 provided in the cylinder body 11.

[0031] Optionally, the diameter of the exhaust hole 21 is set to D. In this embodiment, it is defined that 0 < L ≤ D. The overall clearance volume range of the cylinder 1 is controlled by defining the dimension of the cut portion 111.

[0032] Optionally, the cylinder cover 2 is provided with a second cavity. The second cavity is cylindrical. The center line of the second cavity coincides with the center line of the cylinder cover 2. The second cavity is opposite to the first cavity 12 so that a bearing and a piston can be mounted through the second cavity. In this case, the piston can be attached to the inner wall of the cylinder body 11 and rotate eccentrically in the first cavity 12, thus forming a crescent-shaped space between the piston and the inner wall of the cylinder body 11.

[0033] In summary, the pump body assembly disclosed in this embodiment has at least the following advantages: the arrangement of the cut portion 111 in the cylinder block 11 reduces clearance volume and improves volume efficiency; moreover, the overall clearance volume range of the cylinder 1 is controlled by defining the dimension of the cut portion 111, thereby controlling noise and improving overall performance apart from improving displacement.Example two

[0034] This embodiment provides a rolling piston compressor including the preceding pump body assembly. For the detailed structural characteristics of the pump body assembly, reference may be made to the description of the preceding embodiment and is repeated here. The rolling piston compressor provided in this embodiment has a small clearance volume, high volume efficiency, and low working noise.

[0035] As shown in FIG. 6, in this embodiment, H = 20 mm, h = b = 0.5 mm, L = 6.15 mm, θ = 45°, B = 13 mm, and β = 23°. The clearance volume of the rolling piston compressor provided in this embodiment is reduced by 35% compared to the clearance volume of the rolling piston compressor as shown in FIG. 7; moreover, the peak noise value in the frequency band of 1250 Hz is reduced by about 4 dB.

[0036] The present application provides a pump body assembly. The pump body assembly includes a cylinder. The cylinder includes a cylinder body and a first cavity, where the cylinder body surrounds and defines the first cavity. The cylinder body is provided with a cut portion. One end of the cut portion extends to the inner wall of the cylinder body. The other end of the cut portion extends to an exhaust side of the cylinder. The maximum distance between an edge of the cut portion and the inner wall of the cylinder body is b. The thickness of the cylinder body is B. 0 < b / B ≤ 0.2. The cut portion communicates with the first cavity and intersects the exhaust side of the cylinder. The high-pressure gas in the first cavity is exhausted through the cut portion and the exhaust side of the cylinder, widening the exhaust passage of the high-pressure gas, rationally utilizing the compression volume between the exhaust side of the cylinder and an exhaust port, reducing clearance volume, and improving volume efficiency. Moreover, the setting of the ratio of b to B effectively reduce the noise generated in operation. The rolling piston compressor provided in the present application includes the preceding pump body assembly. The pump body assembly reduces clearance volume, improves volume efficiency, and defines the dimension of the cut portion. Therefore, the displacement of the rolling piston compressor is relatively large, and operation noise is reduced effectively.

Claims

1. A pump body assembly, comprising a cylinder (1), wherein the cylinder (1) comprises a cylinder body (11) provided with a cut portion (111) and a first cavity (12), wherein the cylinder body (11) surrounds and defines the first cavity (12), one end of the cut portion (111) extends to an inner wall of the cylinder body (11), the other end of the cut portion (111) extends to an exhaust side (112) of the cylinder (1), a maximum distance between an edge of the cut portion (111) and the inner wall of the cylinder body (11) is b, and a thickness of the cylinder body (11) is B, wherein 0 < b / B≤ 0.2.

2. The pump body assembly according to claim 1, wherein a length of the cut portion (111) is L and 0 < b / L≤ 0.37.

3. The pump body assembly according to claim 1, wherein a central angle β at which two side edges of the cut portion (111) in a length direction are located satisfies that 0° ≤ β ≤ 23°.

4. The pump body assembly according to claim 1, wherein an angle θ between a tangent line of an edge of the cut portion (111) radially away from an inner center of the cylinder body (11) and a horizontal plane satisfies that 0 < θ ≤ 45°.

5. The pump body assembly according to claim 1, wherein a depth of the cut portion (111) intersecting the inner wall of the cylinder body (11) is h, a depth of the cylinder body (11) is H, h ≤ b, and h ≤ H.

6. The pump body assembly according to any one of claims 1 to 5, wherein, a cutting surface line of the cut portion (111) is formed by a straight line, or cutting surface lines of the cut portion (111) are formed by a plurality of straight lines, or a cutting surface line of the cut portion (111) is formed by a curve, or cutting surface lines of the cut portion (111) are formed by a straight line and a curve.

7. The pump body assembly according to claim 6, further comprising a cylinder cover (2) connected to the exhaust side (112) of the cylinder body (11) and provided with an exhaust hole (21), wherein the exhaust hole (21) penetrates the cylinder cover (2), an axial direction of the exhaust hole (21) is perpendicular to the exhaust side (112), at least part of the exhaust hole (21) communicates with the first cavity (12), and the cut portion (111) communicates with the exhaust hole (21).

8. The pump body assembly according to claim 7, wherein a diameter of the exhaust hole (21) is D, a maximum distance between any two points of the cut portion (111) is L, and 0 < L ≤ D.

9. The pump body assembly according to claim 7, wherein a cross section of the exhaust hole (21) is circular or D-shaped.

10. A rolling piston compressor, comprising the pump body assembly according to any one of claims 1 to 9.

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