A cylinder and a compressor

Abstract

The present invention provides a cylinder and a compressor, wherein the cylinder comprises a cylinder body, wherein the cylinder body is provided with a cylinder cavity along the axial direction, and has a plurality of mounting holes along the circumferential direction, wherein the cavity wall of the cylinder cavity is arranged on a first circle, and the cylinder wall arranged outside the cylinder cavity wall is at least partially arranged on a second circle, wherein the first circle and the second circle are arranged eccentrically, and a convex portion is formed outside the cylinder wall, wherein the convex portion has a blade groove connected to the cylinder cavity, and a blade is arranged in the blade groove, and the blade divides the cylinder cavity into an intake cavity and a compression cavity, and the thickness of the cylinder body wall on the side where the intake cavity is located is greater than the thickness of the cylinder body wall on the side where the compression cavity is located. The present invention increases the thickness of the cylinder body on the side where the intake cavity is located to increase the thermal resistance of the intake cavity and reduce the heat transfer from the high temperature zone in the compressor housing to the intake cavity; and reduces the thickness of the cylinder body on the side where the compression cavity is located to reduce the thermal resistance of the compression cavity and increase the heat dissipation of the compression cavity, and at the same time, the inner diameter of the intake cavity can be reduced and the deformation of the blade groove on the side of the intake cavity can be prevented, thereby reducing mechanical losses and improving the efficiency of the compressor.

Description

Technical Field

[0001] The present invention relates to the technical field of compressors, and in particular to a cylinder and a compressor. Background Art

[0002] Rolling rotor compressors are widely used in various electrical equipment, such as refrigerators, air conditioners, freezers, heat pump water heaters, etc. Their main function is to compress the refrigerant gas from a low-temperature and low-pressure state to a high-temperature and high-pressure state.

[0003] The rolling rotor compressor has a motor and a gas compression component installed in the closed shell. When in operation, it sucks in low-temperature and low-pressure refrigerant from the suction pipe, compresses the piston through the motor drive, and discharges high-temperature and high-pressure refrigerant to the exhaust pipe. In this process, the motor generates heat to form a high-temperature and high-pressure environment in the entire compressor shell. The metal thermal conductivity of the gas compression component is relatively high, and the heat in the high-temperature area of ​​the compressor shell will continuously exchange heat with the compression working chamber through the gas compression component.

[0004] The gas compression assembly of a conventional rolling rotor compressor usually includes a cylinder, an upper bearing, a lower bearing, a piston and a vane. The cylinder, the upper bearing and the lower bearing form a closed compression working chamber, which is divided into an intake chamber and a compression chamber by the piston and the vane. The low-temperature and low-pressure refrigerant enters the intake chamber through the intake channel, and the heat in the high-temperature zone of the compressor shell continuously transfers heat to the refrigerant in the intake chamber, causing the refrigerant in the intake chamber to heat and expand, and the pressure in the intake chamber to rise, resulting in a decrease in the amount of refrigerant inhaled into the intake chamber in the next working cycle, a decrease in the intake capacity, and low volumetric efficiency, which affects the working performance of the compressor. In addition, as the compressor compresses the refrigerant, the temperature and pressure of the refrigerant in the compression chamber gradually increase, and the heat cannot be transferred out in time, resulting in the actual compression process being close to the isentropic compression process, resulting in high power consumption of the compressor, low overall efficiency, high exhaust temperature, and large condensing load. Summary of the invention

[0005] The purpose of the present invention is to provide a cylinder and a compressor to solve the problem in the prior art that the compressor has high power consumption, poor performance and low overall efficiency due to improper heat exchange between the compressor housing and the compressor working chamber. The specific technical solution is as follows:

[0006] In a first aspect, the present invention provides a cylinder, comprising:

[0007] A cylinder body, wherein the cylinder body is formed with a cylinder cavity along the axial direction and has a plurality of mounting holes along the circumferential direction;

[0008] The cavity wall of the cylinder cavity is arranged on a first circle with O as the center and r1 as the radius;

[0009] The cylinder wall arranged outside the cylinder cavity wall is at least partially arranged on a second circle with O' as the center and r2 as the radius;

[0010] The center O of the first circle does not coincide with the center O' of the second circle;

[0011] A circumferentially connected raised portion is formed on the outside of the cylinder cavity wall. The raised portion has a blade groove connected to the cylinder cavity. A blade is arranged in the blade groove. The blade divides the cylinder cavity into an intake cavity and a compression cavity.

[0012] Optionally, the wall thickness of the cylinder body on the side where the suction chamber is located is greater than the wall thickness of the cylinder body on the side where the compression chamber is located.

[0013] Optionally, the thickness of the cylinder wall on the side where the suction chamber is located and the thickness of the cylinder wall on the side where the compression chamber is located are distributed in a gradient from thick to thin.

[0014] Optionally, the minimum distance between the mounting hole and the outer wall of the cylinder body is greater than or equal to 2 mm.

[0015] Optionally, the center O of the first circle is located on the center line of the compressor crankshaft, and the center O' of the second circle is offset from the center O of the first circle by δ, and δ satisfies: 0<δ≤(ΦD-Φdp-4) / 2, wherein ΦD is the diameter of the second circle, and Φdp is the maximum diameter of the circumscribed circle with the center O of the first circle as the center and the mounting hole.

[0016] Optionally, a coordinate system is established with the center O of the first circle as the coordinate origin, and the coordinates of the center O' of the second circle are (x, y), wherein x and y satisfy: x∈[-δ, 0), y∈[-δ, δ / 2].

[0017] Optionally, x and y satisfy: y∈[-δ / 2,δ / 2].

[0018] The present invention also provides a cylinder, comprising:

[0019] A cylinder body, wherein the cylinder body is formed with a cylinder cavity along the axial direction and has a plurality of mounting holes along the circumferential direction;

[0020] A cylinder wall disposed outside the cylinder cavity wall;

[0021] The cylinder cavity wall is formed with a circumferentially connected protrusion, the protrusion has a blade groove connected to the cylinder cavity, the blade groove is provided with a blade, the blade divides the cylinder cavity into an intake cavity and a compression cavity;

[0022] The wall thickness of the cylinder body on the side where the suction chamber is located is greater than the wall thickness of the cylinder body on the side where the compression chamber is located.

[0023] In a second aspect, the present invention provides a compressor, comprising:

[0024] A cylinder, wherein the cylinder is the cylinder as described in the first aspect;

[0025] An upper cylinder cover and a lower cylinder cover are respectively fixed to the axial ends of the cylinder to close the cylinder cavity;

[0026] a piston rotatably disposed in the cylinder chamber;

[0027] a blade, the blade supporting the piston and reciprocating in the blade groove; and

[0028] The crankshaft drives the piston to rotate to compress the refrigerant in the cylinder chamber.

[0029] A cylinder and a compressor provided by the present invention have the following beneficial effects: wherein the cylinder comprises a cylinder body, the cylinder body is provided with a cylinder cavity along the axial direction, and has a plurality of mounting holes along the circumferential direction, the cavity wall of the cylinder cavity is arranged on a first circle with O as the center and r1 as the radius, the cylinder wall arranged outside the cylinder cavity wall is at least partially arranged on a second circle with O' as the center and r2 as the radius, the center O of the first circle does not coincide with the center O' of the second circle, a circumferentially connected raised portion is formed outside the cylinder cavity wall, the raised portion has a blade groove connected to the cylinder cavity, a blade is arranged in the blade groove, the blade divides the cylinder cavity into an intake cavity and a compression cavity, and the cylinder wall thickness on the intake cavity side is greater than the cylinder wall thickness on the compression cavity side. It can be seen that the present invention increases the thickness of the cylinder body on the side where the suction chamber is located by reasonably setting the geometric dimensions of the cylinder in the compressor, thereby increasing the thermal resistance of the suction chamber, reducing the heat transfer from the high-temperature zone in the compressor casing to the suction chamber, increasing the suction volume of the suction chamber, improving the volumetric efficiency, and improving the working performance of the compressor; and reduces the thickness of the cylinder body on the side where the compression chamber is located, thereby reducing the thermal resistance of the compression chamber, increasing the heat dissipation of the compression chamber, and realizing the transfer of the compression process close to isentropic compression to the ideal isothermal compression process, reducing the power consumption of the compression process, improving the efficiency of the whole machine, reducing the exhaust temperature, and reducing the condensation load. At the same time, the inner diameter of the suction chamber can be reduced and the deformation of the blade groove on the side of the suction chamber can be prevented, thereby reducing mechanical losses and improving the efficiency of the compressor. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0031] Figure 1is a structural schematic diagram of a cylinder provided by an embodiment of the present invention;

[0032] Attached Figure 1 The reference numerals are described as follows:

[0033] 1-cylinder body; 11-cylinder chamber; 12-protrusion; 13-blade groove; 14-mounting hole. DETAILED DESCRIPTION

[0034] The following is a further detailed description of a cylinder and a compressor proposed by the present invention in conjunction with the accompanying drawings and specific embodiments. The advantages and features of the present invention will become clearer according to the following description. It should be noted that the accompanying drawings are all in a very simplified form and are not in precise proportions, and are only used to conveniently and clearly assist in explaining the purpose of the embodiments of the present invention.

[0035] It should be noted that the illustrations provided in the following embodiments are only used to schematically illustrate the basic concept of the present invention, and thus the illustrations only show components related to the present invention rather than being drawn according to the number, shape and size of components in actual implementation. In actual implementation, the form, quantity and ratio of each component may be changed arbitrarily, and the component layout may also be more complicated.

[0036] The core idea of ​​the present invention is to provide a cylinder and a compressor. By reasonably setting the geometric dimensions of the cylinder in the compressor, the thickness of the cylinder body on the side where the suction chamber is located is increased, thereby increasing the thermal resistance of the suction chamber, reducing the heat transfer from the high-temperature zone in the compressor casing to the suction chamber, increasing the suction volume of the suction chamber, improving the volumetric efficiency, and improving the working performance of the compressor; and the thickness of the cylinder body on the side where the compression chamber is located is reduced, thereby reducing the thermal resistance of the compression chamber, increasing the heat dissipation of the compression chamber, and realizing the transfer of the compression process close to isentropic compression to the ideal isothermal compression process, reducing the power consumption of the compression process, improving the efficiency of the whole machine, reducing the exhaust temperature, and reducing the condensation load. At the same time, the inner diameter of the suction chamber can be reduced and the deformation of the blade groove on the side of the suction chamber can be prevented, thereby reducing mechanical losses and improving the efficiency of the compressor.

[0037] To this end, the present invention provides a cylinder, see Figure 1 The cylinder comprises a cylinder body 1, which is provided with a cylinder cavity 11 along the axial direction and a plurality of mounting holes 14 along the circumferential direction.

[0038] The cavity wall of the cylinder cavity 11 is arranged on a first circle with O as the center and r1 as the radius, and the cylinder wall arranged outside the wall of the cylinder cavity 11 is at least partially arranged on a second circle with O' as the center and r2 as the radius, wherein the center O of the first circle does not coincide with the center O' of the second circle.

[0039] The outer wall of the cylinder cavity 11 is formed with a circumferentially connected protrusion 12, and the protrusion 12 has a blade groove 13 connected to the cylinder cavity 11. The blade groove 13 is provided with a blade (not shown in the figure), and the blade divides the cylinder cavity into an air intake cavity and a compression cavity. The cylinder wall thickness on the side where the air intake cavity is located is greater than the cylinder wall thickness on the side where the compression cavity is located. The diameter of the second circle is ΦD, and the diameter of the first circle is Φd.

[0040] Through the above arrangement, the thickness of the cylinder body on the side where the suction chamber and the compression chamber are located can be changed, specifically, the cylinder body wall thickness on the side where the suction chamber is located and the cylinder body wall thickness on the side where the compression chamber is located are distributed in a gradient from thick to thin, so as to meet the requirements that the suction chamber absorbs less heat and the compression chamber dissipates heat quickly.

[0041] It should be noted that when setting the first circle and the second circle eccentrically, the minimum distance between the mounting hole 14 on the cylinder body 1 and the outer wall of the cylinder body 1 should be greater than or equal to 2 mm to ensure the strength of the cylinder 1 in this embodiment and avoid cracks in the cylinder 1 during use.

[0042] Furthermore, the first circle and the second circle are eccentrically arranged, and the specific arrangement requirement is that the center O of the first circle is located on the center line of the compressor crankshaft, and the center O' of the second circle is offset by δ relative to the center O of the first circle, and δ satisfies: 0<δ≤(ΦD-Φdp-4) / 2, wherein ΦD is the diameter of the second circle, and Φdp is the maximum diameter of the circumscribed circle with the center O of the first circle as the center and the mounting hole 14 on the cylinder body.

[0043] Further, in order to more intuitively show the relative positional relationship between the center O of the first circle and the center O' of the second circle, please refer to Figure 1 , a coordinate system is established with the center O of the first circle as the origin, and the coordinates of the center O' of the second circle are (x, y), where x and y satisfy: x∈[-δ, 0), y∈[-δ, δ / 2].

[0044] Preferably, x and y satisfy: y∈[-δ / 2, δ / 2], when x and y are respectively within this value range, the performance of the cylinder is better.

[0045] The cylinder provided in this embodiment was tested on a compressor of a certain specification. The performance of the compressor of this specification using the cylinder of this embodiment was compared with the performance of the compressor using the existing cylinder as follows:

[0046]

[0047] As can be seen from the above table, after the compressor of this specification uses the cylinder of this embodiment, compared with the use of the existing cylinder, under various working conditions, the heat absorption of the suction chamber at a certain working moment in a working cycle is reduced to varying degrees, and the heat release of the compression chamber at a certain working moment in a working cycle is increased to varying degrees. It can be seen that this embodiment, without significantly increasing the cost of cylinder manufacturing materials, changes the cylinder wall thickness on the side where the suction chamber and the compression chamber are located by eccentrically setting the first and second circles of the cylinder, thereby adjusting the thermal resistance of the suction process and the compression process, achieving the purpose of controlling the heat exchange amount of the suction chamber and the compression chamber at different stages and improving the working performance of the whole machine.

[0048] Based on the same inventive concept, this embodiment also provides a compressor, including a cylinder, an upper cylinder head, a lower cylinder head, a piston, a blade and a crankshaft. The cylinder is the cylinder described above, the upper cylinder head and the lower cylinder head are respectively fixed to the axial ends of the cylinder to close the cylinder cavity, the piston is rotatably arranged in the cylinder cavity, the blade supports the piston and reciprocates in the blade groove, and the crankshaft drives the piston to rotate to compress the refrigerant in the cylinder cavity.

[0049] In summary, a cylinder and a compressor provided by the present invention have the following advantages: wherein the cylinder includes a cylinder body, the cylinder body is formed with a cylinder cavity along the axial direction, and has a plurality of mounting holes along the circumferential direction, the cavity wall of the cylinder cavity is arranged on a first circle with O as the center and r1 as the radius, the cylinder wall arranged outside the cylinder cavity wall is at least partially arranged on a second circle with O' as the center and r2 as the radius, the center O of the first circle does not coincide with the center O' of the second circle, a circumferentially connected raised portion is formed outside the cylinder cavity wall, the raised portion has a blade groove connected to the cylinder cavity, a blade is arranged in the blade groove, the blade divides the cylinder cavity into an intake cavity and a compression cavity, and the cylinder body wall thickness on the intake cavity side is greater than the cylinder body wall thickness on the compression cavity side. It can be seen that the present invention increases the thickness of the cylinder body on the side where the suction chamber is located by reasonably setting the geometric dimensions of the cylinder in the compressor, thereby increasing the thermal resistance of the suction chamber, reducing the heat transfer from the high-temperature zone in the compressor casing to the suction chamber, increasing the suction volume of the suction chamber, improving the volumetric efficiency, and improving the working performance of the compressor; and reduces the thickness of the cylinder body on the side where the compression chamber is located, thereby reducing the thermal resistance of the compression chamber, increasing the heat dissipation of the compression chamber, and realizing the transfer of the compression process close to isentropic compression to the ideal isothermal compression process, reducing the power consumption of the compression process, improving the efficiency of the whole machine, reducing the exhaust temperature, and reducing the condensation load. At the same time, the inner diameter of the suction chamber can be reduced and the deformation of the blade groove on the side of the suction chamber can be prevented, thereby reducing mechanical losses and improving the efficiency of the compressor.

[0050] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the present invention rather than to limit it. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solution of the present invention can be modified or replaced by equivalents without departing from the spirit and scope of the technical solution of the present invention.

Claims

1. A cylinder, characterized in that: include: A cylinder body, wherein the cylinder body is formed with a cylinder cavity along the axial direction and has a plurality of mounting holes along the circumferential direction; The cavity wall of the cylinder cavity is arranged on a first circle with O as the center and r1 as the radius; The cylinder wall arranged outside the cylinder cavity wall is at least partially arranged on a second circle with O' as the center and r2 as the radius; The center O of the first circle does not coincide with the center O' of the second circle; The cylinder cavity wall is formed with a circumferentially connected protrusion, the protrusion has a blade groove connected to the cylinder cavity, the blade groove is provided with a blade, the blade divides the cylinder cavity into an intake cavity and a compression cavity; The wall thickness of the cylinder body on the side where the suction chamber is located is greater than the wall thickness of the cylinder body on the side where the compression chamber is located.

2. The cylinder according to claim 1, characterized in that The thickness of the cylinder wall on the side where the suction chamber is located and the thickness of the cylinder wall on the side where the compression chamber is located are distributed in a gradient from thick to thin.

3. The cylinder according to claim 2, characterized in that The minimum distance between the mounting hole and the outer wall of the cylinder body is greater than or equal to 2 mm.

4. The cylinder according to claim 3, characterized in that The center O of the first circle is located on the center line of the compressor crankshaft, and the center O' of the second circle is offset by δ from the center O of the first circle, and δ satisfies: 0<δ≤(ΦD-Φdp-4) / 2, wherein ΦD is the diameter of the second circle, and Φdp is the maximum diameter of the circumscribed circle with the center O of the first circle as the center and the mounting hole.

5. The cylinder according to claim 4, characterized in that A coordinate system is established with the center O of the first circle as the origin. The coordinates of the center O' of the second circle are (x, y), where x and y satisfy: x∈[-δ, 0), y∈[-δ, δ / 2].

6. The cylinder according to claim 5, characterized in that x and y satisfy: y∈[-δ / 2,δ / 2].

7. A compressor, characterized in that: include: A cylinder, wherein the cylinder is a cylinder as claimed in any one of claims 1 to 6; An upper cylinder cover and a lower cylinder cover are respectively fixed to the axial ends of the cylinder to close the cylinder cavity; a piston rotatably disposed in the cylinder chamber; A blade, the blade bears against the piston and reciprocates in the blade groove; as well as The crankshaft drives the piston to rotate to compress the refrigerant in the cylinder chamber.

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