Rolling rotor type compressor capable of reducing radial clearance leakage

Abstract

The utility model relates to the technical field of compressors, in particular to a rolling rotor type compressor capable of reducing radial clearance leakage, which comprises a cylinder body, a rotor and blades, an oil injection hole penetrating through a backpressure space to a radial clearance is arranged in the rotor, and pressure-containing lubricating oil in the backpressure space is injected into the radial clearance through the oil injection hole. According to different process requirements, one or more oil injection holes can be arranged, the section shape can be round, directional or irregular, and the pressure-containing lubricating oil can be lubricating oil after oil-gas separation or lubricating oil pressurized by a pump. Pressure-containing lubricating oil sprayed out of the oil spraying hole directly impacts leakage flow in the radial gap, the radial leakage flow can be remarkably reduced, and the volume efficiency is improved. The radial leakage optimization of the rolling rotor type compressor can be realized, so that the comprehensive efficiency of the compressor is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of compressors, in particular to a rolling rotor type compressor capable of reducing radial gap leakage. Background Art

[0002] Rolling rotor compressors, also known as rolling piston compressors or fixed vane compressors, are a type of rotary compressor. At present, rolling rotor compressors are widely used in room air conditioners and small commercial refrigeration equipment. Its basic components include cylinders, rolling rotors, springs, blades, eccentric shafts, etc. The gaps between the relative sliding parts will cause leakage of refrigerant and lubricating oil, and the leakage gap of rolling rotor compressors will gradually increase due to wear during operation, further affecting the leakage and performance of the compressor. The paper ([1] Ma Chong, Li Hongqi, Weng Yangtao, Zhu Hongwei. Simulation analysis of gap leakage of rolling rotor compressors [J]. Refrigeration and Air Conditioning, 2022, Vol. 22 (12): 74-79) pointed out that under the same conditions, the radial gap leakage is the largest, accounting for 65.1%~88.4% of the total leakage. How to reduce radial gap leakage has become an urgent problem to be solved. Utility Model Content

[0003] The purpose of the utility model is to overcome the shortcomings of the prior art and provide a rolling rotor compressor that reduces radial gap leakage. By setting an oil injection hole inside the rotor, the pressurized lubricating oil in the back pressure space is sprayed into the radial gap, and the lubricating oil is vertically injected into the radial leakage channel, which can impact the original radial leakage flow, thereby reducing the gas leakage flow from the exhaust chamber to the suction chamber due to the pressure difference. Through this technical solution, the optimization of radial leakage can be achieved, thereby improving the efficiency of the rolling rotor compressor.

[0004] In order to achieve the purpose of the utility model, the technical solution adopted by the utility model is:

[0005] The utility model discloses a rolling rotor type compressor for reducing radial gap leakage, comprising a cylinder body, a rotor and blades, wherein the inner wall section of the cylinder body is circular, a rotating shaft is arranged in the axial direction of the cylinder body, and the rotor is eccentrically installed in the interior of the cylinder body through the rotating shaft; a sliding groove for sliding the blade is arranged on the cylinder body, a spring is connected between the end wall of the sliding groove and the outer end of the blade, the inner end of the blade contacts the outer wall of the rotor, and a radial gap is formed between the inner wall of the cylinder body and the outer wall of the rotor; the inner wall of the cylinder body and the outer wall of the rotor are divided into an air intake chamber and an air exhaust chamber by the blades, and an air intake port connected to the air intake chamber and an air exhaust port connected to the air exhaust chamber are respectively arranged on the cylinder body; a back pressure space is arranged at the axis center of the rotating shaft, an oil injection hole is arranged in the radial direction of the rotor, and the radial gap is connected to the back pressure space through the oil injection hole.

[0006] The rotor is provided with one or more oil injection holes in the radial direction.

[0007] The cross section of the oil injection hole is circular, square or irregular.

[0008] There is pressurized lubricating oil in the back pressure space, the pressure of the pressurized lubricating oil is greater than the pressure at the radial gap, and the pressurized lubricating oil is sprayed into the radial gap through the oil spray hole.

[0009] The pressurized lubricating oil is circulating lubricating oil after oil-gas separation or lubricating oil pressurized by a pump.

[0010] Keys are arranged on both sides of the outer wall of the rotating shaft, an eccentric shaft hole for installing the rotating shaft is arranged at the end of the rotor, and a keyway matching the key is arranged on the inner wall of the eccentric shaft hole.

[0011] The beneficial effects of the utility model are:

[0012] The utility model provides an oil injection hole inside the rotor to spray the pressurized lubricating oil in the back pressure space into the radial gap, and vertically injects the lubricating oil into the radial leakage channel, which can impact the original radial leakage flow, thereby reducing the gas leakage flow from the exhaust chamber to the suction chamber due to the pressure difference. Through this technical solution, the radial leakage can be optimized, thereby improving the efficiency of the rolling rotor compressor. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 This is a schematic structural diagram of a rolling rotor type compressor for reducing radial leakage according to an embodiment of the utility model;

[0014] Figure 2 This is a schematic diagram of a rotor structure in which the number of rotor oil injection holes is 1 according to an embodiment of the utility model;

[0015] Figure 3 This is a schematic diagram of a rotor structure in which the number of rotor oil injection holes is 7 according to an embodiment of the utility model;

[0016] Figure 4 This is a schematic diagram of the rotor structure in which the rotor oil injection hole is square in shape according to an embodiment of the utility model.

[0017] In the figure: 1. cylinder body; 2. rotor; 3. inner wall of cylinder body; 4. radial clearance; 5. outer wall of rotor; 6. injection hole; 7. rotating shaft; 8. back pressure space; 9. key; 10. suction chamber; 11. blade; 12. suction port; 13. slide groove; 14. spring; 15. exhaust valve; 16. exhaust port; 17. exhaust chamber. DETAILED DESCRIPTION

[0018] The utility model is further described below:

[0019] See also Figure 1-4 ,

[0020] The utility model discloses a rolling rotor type compressor for reducing radial gap leakage, comprising a cylinder body 1, a rotor 2 and a blade 11, wherein the cylinder inner wall 3 of the cylinder body 1 is circular in cross section, a rotating shaft 7 is arranged in the axial direction of the cylinder body 1, and the rotor 2 is eccentrically mounted inside the cylinder body 1 through the rotating shaft 7; a slide groove 13 for sliding of the blade 11 is arranged on the cylinder body 1, a spring 14 is connected between the end wall of the slide groove 13 and the outer end of the blade 11, the inner end of the blade 11 contacts the outer wall of the rotor 2, and the cylinder inner wall 3 and the rotor outer wall 5 cooperate with each other to form a radial gap 4; the cylinder inner wall 3 and the rotor outer wall 5 are divided into an air intake chamber 10 and an air discharge chamber by the blade 11 17, the cylinder body 1 is provided with an air intake port 12 connected to the air intake chamber 10 and an air exhaust port 16 connected to the air exhaust chamber 17, and an air exhaust valve 15 is provided at the outer end of the air exhaust port 16; the axis of the rotating shaft 7 is provided with a back pressure space 8, and the radial direction of the rotor 2 is provided with an oil injection hole 6, and the radial gap 4 is connected to the back pressure space 8 through the oil injection hole 6. The radial gap 4 changes its position as the rotor rotates, but the oil injection hole 6 always connects the back pressure space 8 and the radial gap 4, and the pressurized lubricating oil in the back pressure space 8 is sprayed into the radial gap 4, and the lubricating oil is vertically injected into the radial leakage channel, which can impact the original radial leakage flow, thereby reducing the gas leakage flow from the exhaust chamber to the air intake chamber due to the pressure difference. Through this technical solution, the radial leakage can be optimized, thereby improving the efficiency of the rolling rotor compressor.

[0021] For further information, see Figure 2 and Figure 3 As shown, the number of the oil injection holes 6 can be one or more. Figure 2 The rotor shown here has one oil injection hole 6. Figure 3 The illustrated case is one in which each rotor includes seven oil injection holes 6 .

[0022] For further information, see Figure 2 and Figure 4 The cross-sectional shape of the oil injection hole 6 can be circular, square or irregular. Figure 2 The figure shows the case where the cross-section of the injection hole 6 is circular. Figure 4 The figure shows a case where the cross-sectional shape of the oil injection hole 6 is a square.

[0023] See also Figure 4 The oil injection holes 8 are arranged along the diameter direction of the roller 2 and pass through the back pressure space 8 to the radial gap 4.

[0024] See also Figure 1, the back pressure space 8 contains pressurized lubricating oil. According to the requirements of the operating parameters, the pressurized lubricating oil is the circulating lubricating oil after oil-gas separation or the lubricating oil pressurized by a pump. The pressure of the lubricating oil after oil-gas separation is higher than the pressure in the radial gap 4 area, so that the lubricating oil can be sprayed into the radial gap. If the injection pressure is to be further increased, the lubricating oil can be further pressurized by an external pump and then sprayed into the radial gap 4. The pressurized lubricating oil sprayed from the oil injection hole 6 directly impacts the leakage flow in the radial gap 4, which can significantly reduce the leakage flow between adjacent chambers, thereby improving the volumetric efficiency.

[0025] The back pressure space 8 contains pressurized lubricating oil, the pressure of which is greater than the pressure at the radial gap 4 , and the pressurized lubricating oil is sprayed into the radial gap 4 through the oil spray hole 6 .

[0026] The utility model is a vane-top oil-injected rotary vane compressor, which optimizes leakage by injecting pressurized lubricating oil from the back pressure space 8 into the radial gap 4. The advantages are:

[0027] 1 A rolling rotor compressor structure with reduced radial leakage is proposed, which has the advantages of simple structure, easy use, high efficiency and energy saving;

[0028] 2 A rolling rotor compressor with reduced radial leakage is proposed, which can optimize radial leakage and improve compressor efficiency compared with the existing technology;

[0029] 3. When the oil injection scheme is implemented by using the circulating lubricating oil after oil and gas separation, compared with the existing oil injection technology of the rotary compressor, the use of the oil injection device and energy consumption can be saved, and the configuration of the compressor system can be simplified;

[0030] The injection hole 6 may be provided with different parameters such as shape, quantity, injection pressure, etc. as required to meet the process requirements of different speed, flow rate, etc.

[0031] The above description is only an embodiment of the present utility model, and does not limit the patent scope of the present utility model. Any equivalent transformation made by using the contents of the specification and drawings of the present utility model or directly or indirectly applied in the relevant technical field is also included in the patent protection scope of the present utility model.

Claims

1. A rolling rotor compressor for reducing radial gap leakage, characterized in that: It comprises a cylinder body (1), a rotor (2) and blades (11); the cylinder body (1) has an inner wall (3) with a circular cross section; the cylinder body (1) is provided with a rotating shaft (7) in the axial direction; and the rotor (2) is eccentrically mounted inside the cylinder body (1) via the rotating shaft (7); The cylinder body (1) is provided with a slide groove (13) for the blade (11) to slide, a spring (14) is connected between the end wall of the slide groove (13) and the outer end of the blade (11), the inner end of the blade (11) contacts the outer wall of the rotor (2), and the inner wall (3) of the cylinder body and the outer wall (5) of the rotor cooperate with each other to form a radial gap (4); the inner wall (3) of the cylinder body and the outer wall (5) of the rotor are separated into an air intake chamber (10) and an air discharge chamber (17) by the blade (11), and the cylinder body (1) is respectively provided with an air intake port (12) communicating with the air intake chamber (10) and an air discharge port (16) communicating with the air discharge chamber (17); A back pressure space (8) is provided at the axis of the rotating shaft (7), an oil injection hole (6) is provided in the radial direction of the rotor (2), and the radial gap (4) and the back pressure space (8) are connected through the oil injection hole (6).

2. A rolling rotor type compressor for reducing radial gap leakage according to claim 1, characterized in that: One or more oil injection holes (6) are provided in the radial direction of the rotor (2).

3. A rolling rotor type compressor for reducing radial gap leakage according to claim 1, characterized in that: The cross section of the oil injection hole (6) is circular or square.

4. A rolling rotor type compressor for reducing radial gap leakage according to claim 1, characterized in that: The back pressure space (8) contains pressurized lubricating oil, the pressure of which is greater than the pressure at the radial gap (4), and the pressurized lubricating oil is sprayed into the radial gap (4) through the oil spray hole (6).

5. A rolling rotor type compressor for reducing radial gap leakage according to claim 4, characterized in that: The pressurized lubricating oil is circulating lubricating oil after oil-gas separation or lubricating oil pressurized by a pump.

6. A rolling rotor type compressor for reducing radial gap leakage according to claim 1, characterized in that: Keys (9) are provided on both sides of the outer wall of the rotating shaft (7), an eccentric shaft hole for mounting the rotating shaft (7) is provided at the end of the rotor (2), and a keyway matching the key (9) is provided on the inner wall of the eccentric shaft hole.

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