Compressor and refrigeration equipment

Abstract

The compressor comprises an air cylinder and a piston, the air cylinder is provided with a compression cavity, the piston is located in the compression cavity and can eccentrically rotate, the inner diameter of the air cylinder is D1, the height of the air cylinder in the axial direction is H, and H / D1 is larger than or equal to 0.15 and smaller than or equal to 0.3. Therefore, the whole air cylinder is designed to be flat, the contact height between the inner wall of the air cylinder and the peripheral side wall of the piston is reduced in the axial direction, a leakage channel of the part is reduced, leakage in the operation process of the compressor is reduced, and the efficiency of the compressor is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of compressors, and particularly relates to a compressor and a refrigeration device. Background Art

[0002] In a rotary compressor, generally, there are provided a cylinder, a crankshaft having an eccentric portion structure, a piston sleeved on the eccentric portion of the crankshaft, and a sliding vane abutted against the outer circumference of the piston. When the compressor operates, the motor drives the crankshaft to rotate, the crankshaft drives the piston to roll along the inner wall of the cylinder, and the sliding vane always abuts against the outer circumference of the piston, forming two independent chambers. As the piston rotates, the processes of suction, compression, and exhaust are completed. Since the cylinder, piston, sliding vane, crankshaft, etc. are independent and relatively movable parts, clearance needs to be reserved between the relatively moving parts. Therefore, when designing, clearance for fitting needs to be reserved. The existence of this fitting clearance will cause the gas in the high-pressure chamber to leak to the low-pressure chamber, affecting the efficiency of the compressor. Therefore, how to adjust the leakage amount is still the focus of the current compressor design. Summary of the Utility Model

[0003] The main object of the utility model is to provide a compressor and a refrigeration device, aiming to reduce the leakage channel between the cylinder and the piston by making the cylinder flattened, thereby improving the efficiency of the compressor.

[0004] To achieve the above object, the compressor proposed by the utility model includes a cylinder and a piston. The cylinder has a compression chamber, and the piston is located in the compression chamber and can rotate eccentrically. The inner diameter of the cylinder is D1, and the height of the cylinder in the axial direction is H, where 0.15 ≤ H / D1 ≤ 0.3.

[0005] In an embodiment, 0.15 ≤ H / D1 ≤ 0.22.

[0006] In an embodiment, the outer diameter of the cylinder is D2, where 0.05 ≤ H / D2 ≤ 0.15.

[0007] In an embodiment, 50 mm ≤ D2 ≤ 160 mm.

[0008] In an embodiment, 36 mm ≤ D1 ≤ 76 mm and / or 8 mm ≤ H ≤ 24 mm.

[0009] In an embodiment, the exhaust core-adjusting angle of the cylinder is α, and the calculation formula of α is:

[0010] (360° * Pdmin) / (Pdmin + Psmax) ≤ α ≤ (360° * Pdmax) / (Pdmax + Psmin);

[0011] Where: Pd is the exhaust pressure, and Ps is the suction pressure.

[0012] In one embodiment, 170° ≤ α ≤ 230°.

[0013] In one embodiment, 5.0 ≤ Pd ≤ 12.0 MPa, and / or, 2.8 ≤ Ps ≤ 6.0 MPa.

[0014] In one embodiment, the cylinder is further provided with a sliding vane groove communicating with the compression chamber, and a sliding vane that is movable along the sliding vane groove and abuts against the piston is arranged in the sliding vane groove.

[0015] In one embodiment, the refrigerant of the compressor is a carbon dioxide refrigerant.

[0016] The present utility model further provides a refrigeration device, including the above-mentioned compressor. The compressor at least includes a cylinder and a piston. The cylinder has a compression chamber, and the piston is located in the compression chamber and can rotate eccentrically. The inner diameter of the cylinder is D1, and the height of the cylinder in the axial direction is H. Wherein, 0.15 ≤ H / D1 ≤ 0.3.

[0017] In the technical solution of the present utility model, by limiting the ratio of the height of the cylinder to the inner diameter of the cylinder to be 0.15 ≤ H / D1 ≤ 0.3, the size of the corresponding piston should be adjusted accordingly, so that the overall cylinder is designed to be flattened. In the axial direction, the height of the contact between the inner wall of the cylinder and the circumferential side wall of the piston becomes smaller, reducing the leakage channel in this part, which is beneficial to reducing the leakage during the operation of the compressor and improving the efficiency of the compressor. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the technical solutions in the embodiments of the present utility model or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the following drawings are only some embodiments of the present utility model. For those of ordinary skill in the art, without creative efforts, other drawings can be obtained based on the structures shown in these drawings.

[0019] Figure 1 It is a schematic structural diagram of an embodiment of the compressor provided by the present utility model;

[0020] Figure 2 It is Figure 1 a schematic cross-sectional view along A-A in

[0021] Figure 3 It is Figure 1 a schematic cross-sectional view of the cylinder along B-B in

[0022] Explanation of the reference numerals in the drawings:

[0023] 1. Cylinder; 11. Suction hole; 12. Vane slot; 2. Piston; 3. Vane.

[0024] The realization of the purpose, functional features and advantages of the present utility model will be further described with reference to the accompanying drawings in conjunction with the embodiments. Specific embodiments

[0025] Next, the technical solutions in the embodiments of the present utility model will be clearly and completely described with reference to 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 embodiments. Based on the embodiments in the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative work belong to the scope of protection of the present utility model.

[0026] It should be noted that if there are directional indications (such as up, down, left, right, front, back,...) in the embodiments of the present utility model, the directional indications are only used to explain the relative positional relationship and movement conditions between components in a specific posture. If the specific posture changes, the directional indications will also change accordingly.

[0027] In addition, if there are descriptions such as "first", "second", etc. in the embodiments of the present utility model, the descriptions of "first", "second", etc. are only for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include at least one of such features. In addition, if "and / or" or "and / or" appears throughout the text, its meaning includes three parallel solutions. Taking "α and / or B" as an example, it includes the α solution, or the B solution, or the solution where α and B are satisfied simultaneously. In addition, the technical solutions between the embodiments can be combined with each other, but it must be based on the fact that those of ordinary skill in the art can implement them. When the combination of technical solutions results in contradictions or cannot be implemented, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection required by the present utility model.

[0028] In a rotary compressor, there are generally a cylinder, a crankshaft with an eccentric structure, a piston sleeved on the eccentric part of the crankshaft, and a sliding vane abutted against the outer circumference of the piston. When the compressor operates, the motor drives the crankshaft to rotate, the crankshaft drives the piston to roll along the inner wall of the cylinder, and the sliding vane always abuts against the outer circumference of the piston, forming two independent chambers. With the rotation of the piston, the processes of suction, compression, and exhaust are completed. Since the cylinder, piston, sliding vane, crankshaft, etc. are independent and relatively movable parts, gaps need to be reserved between the relatively moving parts. Therefore, when designing, fitting gaps need to be reserved, such as: cylinder inner diameter - piston outer diameter, cylinder height - sliding vane height, sliding vane height - piston height, etc. The existence of this fitting gap will cause the gas in the high-pressure chamber to leak to the low-pressure chamber, affecting the efficiency of the compressor.

[0029] Based on this, the present utility model proposes a compressor and a refrigeration device, aiming to improve the leakage situation of the leakage channel between the cylinder and the piston, thereby improving the efficiency of the compressor.

[0030] Specifically, please refer to Figures 1 to 3 , the compressor includes a cylinder 1 and a piston 2. The cylinder 1 has a compression chamber. The piston 2 is located in the compression chamber and can rotate eccentrically. The inner diameter of the cylinder is D1, and the height of the cylinder 1 in the axial direction is H, where 0.15 ≤ H / D1 ≤ 0.3.

[0031] In the technical solution of the present utility model, by defining the ratio of the height of the cylinder 1 to the inner diameter of the cylinder 1 as 0.15 ≤ H / D1 ≤ 0.3, the size of the corresponding piston 2 should be adjusted accordingly, so that the overall cylinder 1 is designed to be flattened. In the axial direction, the height of the contact between the inner wall of the cylinder 1 and the circumferential side wall of the piston 2 becomes smaller, reducing the leakage channel in this part, which is beneficial to reducing the leakage during the operation of the compressor and improving the efficiency of the compressor.

[0032] It should be noted that the flat design of the cylinder is mostly for the compact layout, generally involving the adjustment of the outer diameter of the cylinder. However, the cylinder structure of this application mainly focuses on the contact leakage path between the cylinder and the piston. Therefore, it focuses on improving the dimensions in the axial direction. By limiting the height and inner diameter of the cylinder, the dimensions of the leakage channel between the cylinder and the piston are indirectly shown. The height of the piston is generally the same as the height of the cylinder.

[0033] For different design requirements of the compressor, the cylinder 1 has volume requirements. Therefore, in this application, while reducing the height of the cylinder 1, the cross-sectional area of the cylinder 1 should be increased. By limiting the ratio relationship between the inner diameter and the height of the cylinder 1, the compression chamber of the cylinder 1 is made flat. It should be understood that the height of the cylinder 1 should be reduced as much as possible to shorten the contact leakage channel between the cylinder 1 and the piston 2. However, the manufacturability of the cylinder 1 and the matching effect with the piston 2 also need to be considered. Therefore, the ratio relationship is further limited to 0.15 ≤ H / D1 ≤ 0.22, so as to obtain a smaller cylinder height dimension and make the leakage amount smaller when the cylinder 1 starts to exhaust.

[0034] Considering that the compressor is the core component of the refrigeration equipment, its structural size affects the overall system layout of the refrigeration equipment. Therefore, the ratio relationship between the outer diameter D2 of the cylinder 1 and the height of the cylinder 1 is limited to 0.05 ≤ H / D2 ≤ 0.15, that is, the ratio of the height of the cylinder 1 to the outer diameter of the cylinder 1 is any value from 0.05 to 0.15, so as to limit the external dimensions of the cylinder 1. By using a cylinder with a smaller height, that is, the cylinder is flatter, the installation space occupied by the cylinder can be reduced, which is conducive to optimizing the size of the compressor shell, achieving a miniaturized structure, and reducing the installation space occupied by the whole compressor.

[0035] Furthermore, 0.07 ≤ H / D2 ≤ 0.13, so that the compressor has a compact structure, small volume and small occupied space.

[0036] It should be noted that generally, the outer circumference of the cylinder 1 is irregular. Therefore, the outer diameter of the cylinder 1 mentioned here is the diameter of the circle where the side (or point, arc) farthest from the center of the circle on the outer circumference of the cylinder is located.

[0037] Moreover, during the structural matching, if the size of the cylinder 1 is too large or too small, it will affect its matching relationship with related parts. Therefore, 36 mm ≤ D1 ≤ 76 mm, 8 mm ≤ H ≤ 24 mm, 50 mm ≤ D2 ≤ 160 mm are limited.

[0038] To improve the refrigeration capacity of the compressor and meet the refrigeration requirements of the refrigeration equipment, the compressor uses carbon dioxide refrigerant. On the one hand, carbon dioxide does not damage the atmospheric ozone layer, can reduce the global greenhouse effect, and has a wide source and low price, which can reduce the refrigerant cost and has good economy. On the other hand, the carbon dioxide refrigerant has a small molecular weight and a large refrigeration capacity. The unit refrigeration capacity at 0 °C is 5 to 8 times higher than that of conventional refrigerants (such as R410A, R32, R290, etc.). Therefore, it can be adapted to a compressor with a smaller volume of the compression chamber of the cylinder, and can effectively improve the refrigeration capacity. At the same time, the overall weight can be reduced, which is convenient for installation and transportation. Therefore, it can achieve the same refrigeration capacity or even increase the refrigeration capacity while reducing the volume of the compressor.

[0039] Specifically, the cylinder 1 is further provided with a sliding vane groove 12 communicating with the compression chamber. A sliding vane 3 is arranged in the sliding vane groove and can move along the sliding vane groove 12 and abut against the piston. The sliding vane 3 cooperates with the piston 2 to divide the compression chamber of the cylinder 1 into a high-pressure chamber and a low-pressure chamber during the rotation of the piston 2. Specifically, in the entire compressor structure, the compressor includes a motor assembly, a cylinder 1 and a crankshaft. Generally speaking, the outer shape of the cylinder 1 is circular or protrudes a part on the basis of a circle. The compression chamber of the cylinder 1 is provided with a piston 2, and the piston 2 is eccentrically arranged and sleeved on the eccentric part of the crankshaft. Bearings are welded on the upper and lower sides of the cylinder 1 respectively. The lower part of the crankshaft passes through the cylinder 1 and is installed on the two bearings. The crankshaft can rotate relative to the cylinder 1 to drive the piston 2 to rotate. The motor assembly generally includes a rotor and a stator sleeved on the rotor. One end of the crankshaft is connected to the rotor of the motor assembly, so as to realize the transmission connection between the motor assembly and the piston 2 through the crankshaft. Therefore, the piston 2 can be driven by the motor assembly to rotate in the cylinder 1 to realize the processes of intake, compression and exhaust of the refrigerant.

[0040] It should be understood that the exhaust core adjustment angle α is the angle that the piston 2 rotates counterclockwise from the position where the sliding vane 3 is located to the position where exhaust starts. Please refer to Figure 1 again. The piston 2 rotates counterclockwise from the intake position through the intake hole 11 to the position where exhaust starts, that is, the position marked by the black arrow. The rotation angle of the piston 2 is α.

[0041] The core adjustment process is as follows: When assembling the cylinder 1, the piston 2 and the bearing together, place the shim between the outer periphery of the piston 2 and the inner wall of the cylinder 1. When it can rotate normally, tighten the screw. This is the core adjustment process. The main purpose is to adjust the radial clearance between the piston 2 and the cylinder 1 to a set value when the piston 2 rotates to a set angle. The shim is a thin sheet made for core adjustment.

[0042] It should be noted that the calculation formula for the exhaust core adjustment angle α is:

[0043] (360° * Pdmin) / (Pdmin + Psmax) ≤ α ≤ (360° * Pdmax) / (Pdmax + Psmin)

[0044] Where Pd is the exhaust pressure and Ps is the intake pressure.

[0045] Furthermore, 5.0 ≤ Pd ≤ 12.0 MPa and 2.8 ≤ Ps ≤ 6.0 MPa.

[0046] Adjusting the core-aligning angle of the cylinder 1 is beneficial to reducing the leakage amount at the beginning of exhaust. Taking the CO2 compressor as an example, the pressure difference between the high-pressure side and the low-pressure side of the CO2 compressor is large, but the pressure ratio is small. According to P*V / T = constant, it can be known that the CO2 compressor can reach the set exhaust pressure faster (with a small rotation angle) during the compression process. Therefore, appropriately reducing the core-aligning angle is beneficial to reducing the leakage amount at the beginning of exhaust and improving the compressor efficiency. In this embodiment, the exhaust core-aligning angle α is set to 170° ≤ α ≤ 230°, so as to achieve the best effect.

[0047] The present invention also provides a refrigeration device, which includes a compressor. The specific structure of the compressor refers to the above-mentioned embodiment. Since this refrigeration device adopts all the technical solutions of the above-mentioned all embodiments, it at least has all the beneficial effects brought by the technical solutions of the above-mentioned embodiments, and will not be elaborated one by one here.

[0048] The refrigeration device provided by the present invention can be electrical appliances such as air conditioners and refrigerators, which are not limited here.

[0049] The above is only an exemplary embodiment of the present invention, and does not limit the patent scope of the present invention. Any equivalent structural transformation made by using the content of the specification and drawings of the present invention under the technical concept of the present invention, or direct / indirect application in other related technical fields is included in the patent protection scope of the present invention.

Claims

1. A compressor, characterized in that, The compressor includes a cylinder and a piston. The cylinder has a compression chamber. The piston is located in the compression chamber and can rotate eccentrically. The inner diameter of the cylinder is D1, and the height of the cylinder in the axial direction is H, where 0.15 ≤ H / D1 ≤ 0.

3.

2. The compressor according to claim 1, characterized in that, 0.15 ≤ H / D1 ≤ 0.

22.

3. The compressor according to claim 1, characterized in that, The outer diameter of the cylinder is D2, where 0.05 ≤ H / D2 ≤ 0.

15.

4. The compressor according to claim 3, wherein, 50mm ≤ D2 ≤ 160mm.

5. The compressor according to claim 1, characterized in that, 36mm ≤ D1 ≤ 76mm and / or, 8mm ≤ H ≤ 24mm.

6. The compressor according to claim 1, characterized in that, The exhaust alignment angle of the cylinder is α, and the calculation formula of α is: (360°*Pdmin) / (Pdmin + Psmax) ≤ α ≤ (360°*Pdmax) / (Pdmax + Psmin); Where: Pd is the exhaust pressure, and Ps is the suction pressure.

7. The compressor according to claim 6, wherein, 170°≤α≤230°。 8. The compressor according to claim 1, characterized in that, 5.0 ≤ Pd ≤ 12.0MPa, and / or, 2.8 ≤ Ps ≤ 6.0MPa.

9. The compressor according to claim 1, characterized in that, The refrigerant of the compressor is carbon dioxide refrigerant.

10. A refrigeration device, characterized in that It includes the compressor according to any one of claims 1 to 9.

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