Pump body assembly and rolling rotor compressor

Abstract

The invention belongs to the technical field of compressors, and discloses a pump body assembly which comprises an air cylinder, the air cylinder comprises a cylinder body and a first cavity defined by the cylinder body, a notch part is formed in the cylinder body, one end of the notch part extends to the inner wall of the cylinder body, and the other end of the notch part extends to the exhaust side of the air cylinder. The maximum distance between the edge of the notch part and the inner wall of the cylinder body is b, the thickness of the cylinder body is B, b / B is larger than 0 and smaller than or equal to 0.2, the notch part is communicated with the first cavity and connected to the exhaust side of the air cylinder, high-pressure air in the first cavity is exhausted after passing through the notch part and the exhaust side of the air cylinder, the clearance volume is reduced, the volume efficiency is improved, and meanwhile noise can be reduced; the rolling rotor compressor provided by the invention comprises the pump body assembly, and due to the fact that the pump body assembly reduces the clearance volume, improves the volume efficiency and reduces noise, the rolling rotor compressor is large in displacement and low in noise.

Description

Technical Field

[0001] The invention relates to the technical field of compressors, and in particular to a pump body assembly and a rolling rotor compressor. Background Art

[0002] A compressor is a driven fluid machine that lifts low-pressure gas into high-pressure gas. Compressors include reciprocating and rotary types. Among them, the rotary type is commonly used with rolling rotor compressors. Rolling rotor compressors have many advantages such as simple structure, excellent performance, and low cost. They work by using the rotational force of the motor to compress low-pressure gas into high-pressure gas and discharge it. The rotary compressor is mainly composed of a housing, a motor, a crankshaft, a piston, a cylinder, and blades. The piston is located in the cylinder. When the crankshaft rotates around the center of rotation, the piston rotates closely against the inner surface of the cylinder. As a result, a crescent-shaped space can be formed between the outer surface of the piston and the inner surface of the cylinder.

[0003] It is a trend to make small series compressors with large displacement to replace large series compressors. However, the cylinder exhaust side cutouts of rolling rotor compressors in the prior art are all made as follows: Figure 7 The arc-shaped cut shown in the figure does not make good use of the compression volume between the exhaust side of the cylinder and the exhaust port, making it difficult to increase the effective volume of the rolling rotor compressor, resulting in low volumetric efficiency and small displacement. In addition, the existing rolling rotor compressor will cause noise due to exhaust pulsation during exhaust, thereby increasing power consumption.

[0004] Therefore, a device is urgently needed to solve the above problems. Summary of the invention

[0005] The object of the present invention is to provide a pump body assembly which reduces the clearance volume, improves the volumetric efficiency and reduces the noise.

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

[0007] A pump body assembly includes a cylinder, which includes a cylinder body and a first cavity formed by the cylinder body. The cylinder body is provided with a cutout portion, and one end of the cutout portion extends to the inner wall of the cylinder body, and the other end of the cutout portion extends to the exhaust side of the cylinder. The maximum distance between the edge of the cutout portion and the inner wall of the cylinder body is b, and the thickness of the cylinder body is B, wherein 0<b / B≤0.2.

[0008] Preferably, the length of the cutout portion is L, wherein 0<b / L≤0.37.

[0009] Preferably, a central angle α of two side edges of the cutout portion along the length direction satisfies 4°≤α≤23°.

[0010] Preferably, an angle θ between a tangent line of an edge of the cutout portion radially away from the inner side of the cylinder body and a horizontal plane satisfies 0<θ≤45°.

[0011] Preferably, the depth of the cutout portion intersecting the inner wall of the cylinder body is h, and the depth of the cylinder body is H, wherein h≤b, and h≤H.

[0012] Preferably, the cutting plane line of the incision portion is formed by a straight line, or the cutting plane line of the incision portion is formed by several straight lines, or the cutting plane line of the incision portion is formed by a curve, or the cutting plane line of the incision portion is formed by a straight line and a curve.

[0013] Preferably, the pump body assembly also includes a cylinder head, which is connected to the exhaust side of the cylinder body, and is provided with an exhaust hole, which passes through the cylinder head, and the axial direction of the exhaust hole is perpendicular to the exhaust side, at least part of the exhaust hole is connected to the first cavity, and the cutout portion is connected to the exhaust hole.

[0014] Preferably, the diameter of the exhaust hole is D, and the maximum distance between any two points of the cutout portion is L, wherein 0<L≤D.

[0015] Preferably, the cross-sectional shape of the exhaust hole is circular or D-shaped.

[0016] Another object of the present invention is to provide a rolling rotor compressor with increased displacement.

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

[0018] A rolling rotor compressor comprises the above-mentioned pump body assembly.

[0019] Beneficial effect: The present invention provides a pump body assembly, which includes a cylinder, wherein the cylinder includes a cylinder body and a first cavity formed by the cylinder body, the cylinder body is provided with a cutout portion, and one end of the cutout portion extends to the inner wall of the cylinder body, and the other end of the cutout portion extends to the exhaust side of the cylinder, the maximum distance between the edge of the cutout portion and the inner wall of the cylinder body is b, and the thickness of the cylinder body is B, wherein 0<b / B≤0.2, specifically, the cutout portion is connected to the first cavity and intersects with the exhaust side of the cylinder, and the high-pressure gas in the first cavity passes through the cutout portion and the gas outlet. The air is discharged from the exhaust side of the cylinder, which widens the discharge channel of the high-pressure gas, rationally utilizes the compression volume between the exhaust side of the cylinder and the exhaust port, reduces the clearance volume, improves the volumetric efficiency, and at the same time effectively reduces the noise generated during operation by setting the ratio of b to B; the rolling rotor compressor provided by the present invention includes the above-mentioned pump body assembly. Since the pump body assembly reduces the clearance volume and improves the volumetric efficiency, and at the same time further limits the size of the cut-out portion, the displacement of the rolling rotor compressor is large and the operating noise is effectively reduced. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 The structure of the cylinder provided in the first embodiment of the present invention is shown in FIG. Figure 1 ;

[0021] Figure 2 The structure of the cylinder provided in the first embodiment of the present invention is shown in FIG. Figure 2 ;

[0022] Figure 3 is a partial cross-sectional view of a cylinder provided in Embodiment 1 of the present invention;

[0023] Figure 4 The assembly diagram of the cylinder and the cylinder head provided in the first embodiment of the present invention is shown in FIG. Figure 1 ;

[0024] Figure 5 The assembly diagram of the cylinder and the cylinder head provided in the first embodiment of the present invention is shown in FIG. Figure 2 ;

[0025] Figure 6 This is a comparison diagram of the noise peaks of the rolling rotor compressor provided by the second embodiment of the present invention at different operating frequencies when H=20mm, h=b=0.5mm, L=6.15mm, θ=45°, B=13mm, α=23° is set and the existing rolling rotor compressor;

[0026] Figure 7 It is a structural schematic diagram of a cylinder in the prior art provided by the present invention.

[0027] In the figure: 1, cylinder; 11, cylinder body; 111, cutout portion; 112, exhaust side; 12, first cavity; 2, cylinder head; 21, exhaust hole. DETAILED DESCRIPTION

[0028] The present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It is to be understood that the specific embodiments described herein are only used to explain the present invention, rather than to limit the present invention. It should also be noted that, for ease of description, only parts related to the present invention, rather than all structures, are shown in the accompanying drawings.

[0029] In the description of the present invention, unless otherwise clearly specified and limited, the terms "connected", "connected", and "fixed" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0030] In the present invention, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may include that the first and second features are in direct contact, or may include that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, a first feature being "above", "above" and "above" a second feature includes that the first feature is directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. A first feature being "below", "below" and "below" a second feature includes that the first feature is directly below and obliquely below the second feature, or simply indicates that the first feature is lower in level than the second feature.

[0031] In the description of this embodiment, the terms "upper", "lower", "right", etc., directions or positional relationships are based on the directions or positional relationships shown in the drawings, and are only for the convenience of description and simplification of operation, rather than indicating or implying that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as limiting the present invention. In addition, the terms "first" and "second" are only used to distinguish in the description and have no special meaning.

[0032] The rolling rotor compressor in the prior art does not reasonably utilize the compression volume between the exhaust side and the exhaust port of the cylinder. Figure 7 As shown, the cylinder of the rolling rotor compressor in the prior art is cut on the exhaust side as shown in FIG. Figure 7The arc-shaped cut in the part enclosed by the center line frame makes it difficult to increase the effective volume of the rolling rotor compressor, resulting in low volumetric efficiency. In addition, due to structural characteristics, the existing rolling rotor compressor will cause noise due to exhaust pulsation during exhaust, affecting the performance parameters of the rolling rotor compressor.

[0033] Embodiment 1

[0034] like Figure 1-Figure 5 As shown, this embodiment provides a pump body assembly, which includes a cylinder 1. Specifically, the cylinder 1 includes a cylinder body 11 and a first cavity 12 formed by the cylinder body 11. Figure 1 and Figure 2 As shown, the cylinder body 11 is annular, and the inner wall of the cylinder body 11 is arranged to form a first cavity 12. It should be noted that the cylinder 1 provided in this embodiment is also provided with at least one intake hole, and the intake hole is connected to the first cavity 12. When the rolling rotor compressor is working, the gas enters the first cavity 12 through the intake hole and is compressed, and the compressed high-pressure gas is discharged through the exhaust side 112 of the cylinder 1.

[0035] Furthermore, the cylinder body 11 is provided with a cutout portion 111. Specifically, one end of the cutout portion 111 extends to the inner wall of the cylinder body 11, and the other end of the cutout portion 111 extends to the exhaust side 112 of the cylinder 1, that is, the cutout portion 111 is connected to the first cavity 12 and intersects with the exhaust side 112 of the cylinder 1. The high-pressure gas in the first cavity 12 is discharged after passing through the cutout portion 111 and the exhaust side 112 of the cylinder 1, thereby widening the discharge channel of the high-pressure gas, rationally utilizing the compression volume between the exhaust side 112 of the cylinder 1 and the exhaust port, reducing the clearance volume, and improving the volumetric efficiency.

[0036] The inventor of the present application has found through research that controlling the ratio of the radial length of the cutout portion 111 to the thickness of the cylinder body 11 (i.e., the ratio of the maximum distance b between the edge of the cutout portion 111 and the inner wall of the cylinder body 11 to the thickness B of the cylinder body 11) can effectively improve the volumetric efficiency while taking into account the reduction of noise. Therefore, this embodiment defines the size parameters of the cutout portion 111. Specifically, the maximum distance between the edge of the cutout 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. This embodiment defines 0<b / B≤0.2. The ratio of the radial dimension of the cutout portion 111 (the maximum distance between the edge of the cutout portion 111 and the inner wall of the cylinder body 11) to the thickness of the cylinder body 11 is much smaller than the corresponding ratio of the exhaust cutout in the prior art, which can effectively reduce the overall clearance volume of the cylinder 1, improve the volumetric efficiency, and at the same time take into account the reduction of noise.

[0037] Furthermore, the length of the cutout is set to L. To ensure the exhaust capacity, b and L satisfy: 0<b / L≤0.37.

[0038] Optionally, the central angle α of the two side edges of the cut-out portion 111 along the length direction satisfies 4°≤α≤23°. By designing the aspect ratio of the cut-out portion 111, the clearance volume can be reduced and the noise peak during operation can be effectively reduced, especially the noise peak when the operating frequency is 1250HZ.

[0039] Furthermore, the depth of the cutout 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. The present embodiment limits h≤b, and h≤H, and keeps the depth of the cutout portion 111 within this range, thereby controlling the overall clearance volume range of the cylinder 1. The high-pressure gas has a sufficient guiding depth, which is beneficial to the smooth discharge of the high-pressure gas in the cylinder 1 and improves the reliability of the compressor.

[0040] Furthermore, if Figure 3 As shown, the angle between the tangent line of the edge of the cutout portion 111 away from the inner side of the cylinder body 11 in the radial direction and the horizontal plane is θ, and 0<θ≤45°, which further limits the size of the cutout portion 111 and controls the overall clearance volume range of the cylinder 1.

[0041] Preferably, the cutout portion 111 in this embodiment is formed by cutting. Exemplarily, the cutting surface line of the cutout portion 111 is a straight line, and the cross-sectional shape of any part of the cutout portion 111 is the same right triangle, or the cutting surface line of the cutout portion 111 is a plurality of straight lines, that is, the cross-sectional shape of any part of the cutout portion 111 is a right triangle, and the shapes are not exactly the same, or the cutting surface line of the cutout portion 111 is a curve, specifically, a smooth curve or an irregular curve, or the cutting surface line of the cutout portion 111 is a combination of a straight line and a curve, which is not specifically limited in this embodiment. In this embodiment, the cutout portion 111 is chamfered, specifically a triangular chamfer, and satisfies 0<θ≤45°. It should be noted that the cutting surface line is usually used to represent the cross-sectional view of a part, which is a contour line used to represent the shape and size of the cross section or cross section of a part, which is convenient for actual processing and production operations.

[0042] like Figure 3 and Figure 4 As shown, the pump body assembly provided in this embodiment also includes a cylinder head 2. Specifically, the cylinder head 2 is connected to the cylinder body 11, and one side of the cylinder head 2 is attached to the exhaust side 112 of the cylinder body 11. Further, the cylinder head 2 is provided with an exhaust hole 21, and the exhaust hole 21 passes through the cylinder head 2, and at least part of the exhaust hole 21 can be connected to the first cavity 12. Further, the cutout portion 111 is connected to the exhaust hole 21, that is, the high-pressure gas can be discharged through the exhaust hole 21. Further, the axial direction of the exhaust hole 21 is perpendicular to the exhaust side 112, which is conducive to the smooth discharge of the high-pressure gas in the cylinder 1.

[0043] Furthermore, since the first cavity 12 is circular, the cross-sectional shape of the exhaust hole 21 is adaptively set to be circular or D-shaped to match the cutout portion 111 opened on the cylinder body 11 .

[0044] Preferably, the diameter of the exhaust hole 21 is set to D, and the maximum distance between any two points of the cutout portion 111 is set to L. This embodiment defines 0<L≤D, limits the size of the cutout portion 111, and controls the overall clearance volume range of the cylinder 1.

[0045] Preferably, the cylinder head 2 is provided with a second cavity, which is cylindrical and has a center line that coincides with the center line of the cylinder head 2. Furthermore, the second cavity is directly opposite to the first cavity 12, so that the bearing and the rotor can be installed through the second cavity, thereby enabling the rotor to rotate eccentrically in the first cavity 12 against the inner wall of the cylinder body 11, thereby forming a crescent-shaped space between the inner wall of the cylinder body 11.

[0046] In summary, the pump body assembly disclosed in this embodiment has at least the following advantages: by setting the cut-out portion 111 in the cylinder body 11, the clearance volume is reduced and the volumetric efficiency is improved. At the same time, by limiting the size of the cut-out portion 111, the overall clearance volume range of the cylinder 1 is controlled. It does not blindly pursue the increase in displacement, but takes into account the control of noise and improves the overall performance.

[0047] Embodiment 2

[0048] The present embodiment provides a rolling rotor compressor, including the above-mentioned pump body assembly, wherein the detailed structural features of the pump body assembly can be referred to the description of the above-mentioned embodiment and will not be repeated here. The rolling rotor compressor provided by the present embodiment has a small clearance volume, high volumetric efficiency, and low operating noise.

[0049] Specifically, Figure 6 As shown, in this embodiment, H=20mm, h=b=0.5mm, L=6.15mm, θ=45°, B=13mm, α=23° are set. At this time, the clearance volume of the rolling rotor compressor provided in this embodiment is compared with the following embodiments. Figure 7 The clearance volume of the rolling rotor compressor of the cylinder shown is reduced by 35%, and the noise peak in the 1250 Hz frequency band is reduced by about 4 dB compared with the existing rolling rotor compressor.

[0050] Obviously, the above embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the embodiments of the present invention. For those skilled in the art, various obvious changes, readjustments and substitutions can be made without departing from the protection scope of the present invention. It is not necessary and impossible to list all the embodiments here. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the claims of the present invention.

Claims

1. A pump assembly, characterized in that: The invention comprises a cylinder (1), wherein the cylinder (1) comprises a cylinder body (11) and a first cavity (12) formed by the cylinder body (11), wherein the cylinder body (11) is provided with a cutout portion (111), and one end of the cutout portion (111) extends to the inner wall of the cylinder body (11), and the other end of the cutout portion (111) extends to the exhaust side (112) of the cylinder (1), and the maximum distance between the edge of the cutout portion (111) and the inner wall of the cylinder body (11) is b, and the thickness of the cylinder body (11) is B, wherein 0<b / B≤0.

2.

2. The pump assembly according to claim 1, characterized in that: The length of the cutout portion (111) is L, wherein 0<b / L≤0.

37.

3. The pump assembly according to claim 1, characterized in that: The central angle α of the two side edges of the cutout portion (111) along the length direction satisfies 4°≤α≤23°.

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

5. The pump assembly according to claim 1, characterized in that: The depth of the cutout (111) intersecting the inner wall of the cylinder (11) is h, and the depth of the cylinder (11) is H, wherein h≤b, and h≤H.

6. The pump assembly according to any one of claims 1 to 5, characterized in that: The cutting plane line of the cut portion (111) is formed by a straight line, or the cutting plane line of the cut portion (111) is formed by a plurality of straight lines, or the cutting plane line of the cut portion (111) is formed by a curve, or the cutting plane line of the cut portion (111) is formed by a straight line and a curve.

7. The pump assembly according to claim 6, characterized in that: The pump body assembly further comprises a cylinder head (2), wherein the cylinder head (2) is connected to the exhaust side (112) of the cylinder body (11), and the cylinder head (2) is provided with an exhaust hole (21), wherein the exhaust hole (21) passes through the cylinder head (2), and the axial direction of the exhaust hole (21) is perpendicular to the exhaust side (112), and at least a portion of the exhaust hole (21) is connected to the first cavity (12), and the cutout portion (111) is connected to the exhaust hole (21).

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

9. The pump assembly according to claim 7, characterized in that: The cross-sectional shape of the exhaust hole (21) is circular or D-shaped.

10. A rolling rotor compressor, characterized in that: The invention comprises a pump body assembly as described in any one of claims 1 to 9.

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