Rolling rotor type compressor lubricated by oil injection

Abstract

The rolling rotor type compressor comprises an air cylinder, a rotor and a sliding piece, an oil spraying hole penetrating through the top of the sliding piece to the bottom of the sliding piece is formed in the sliding piece, and pressure-containing lubricating oil in a back pressure space is sprayed into a top gap through the oil spraying hole. According to different working conditions, one or more oil injection holes can be formed, the section shape can be round, directional or irregular, and the pressure-containing lubricating oil can be lubricating oil obtained after oil-gas separation or lubricating oil pressurized through a pump. On one hand, lubricating oil is sprayed into the top gap, a friction pair at the top gap is regulated to form a stable oil film, friction between the top of the slip sheet and the outer wall of the rotor is reduced, and mechanical efficiency is improved; on the other hand, the pressure-containing lubricating oil directly impacts the leakage flow at the top gap from the oil injection hole, the leakage flow of the top gap can be remarkably reduced, and the volume efficiency is improved. According to the utility model, the coupling optimization of friction and leakage at the top of the slip sheet of the rolling rotor type compressor can be realized, so that the comprehensive efficiency of the compressor is obviously improved.

Description

Technical Field

[0001] The utility model relates to the technical field of compressors, in particular to a rolling rotor type compressor with oil injection lubrication. Background Art

[0002] Rolling rotor compressors are typical positive displacement compressors, which are widely used in room air conditioners and other fields. During the rotation of the rolling rotor compressor rotor, the top of the vane slides relative to the outer wall of the rotor, resulting in a friction pair inside the equipment and a leakage channel in the top gap. The friction and leakage at the top of the vane seriously affect the efficiency of the rolling rotor compressor and are an important factor restricting the performance improvement of this type of compressor.

[0003] At present, the contact between the slider and the rolling rotor is mostly a line sealing method. The Chinese patent (CN113482929A) proposes a surface contact structure composed of multiple curves arranged in a certain regular pattern on the rolling rotor, and matches the end arc of the slider. Through the derivation of geometric relationships, it can be ensured that during the rotation of the rolling rotor, the contact between the slider and the outer wall of the rolling rotor always maintains surface contact to reduce leakage through this point, solving the line contact and line sealing problems caused by the tangent between the slider and the outer surface of the rolling rotor. However, the surface contact increases the complexity of the rolling rotor compressor mechanism, and the slider needs to be connected to the slider contact piece. In addition, the excessive surface contact area will also increase the friction power consumption between the contact piece and the eccentric rotor, and the friction pair loss problem is not actually solved. At the same time, reducing the contact area or increasing the gap in order to reduce friction will significantly increase the leakage. Therefore, there is a certain contradictory relationship between friction and leakage. This patent proposes a rolling rotor compressor structure with oil injection lubrication, while optimizing the friction and leakage problems at the top of the sliding vane. Utility Model Content

[0004] The purpose of the utility model is to overcome the shortcomings of the prior art and provide a rolling rotor compressor with oil injection lubrication. By setting an oil injection hole inside the vane, the lubricating oil after oil-gas separation or the lubricating oil after supercharging is sprayed into the top gap. On the one hand, the flow direction of the injected lubricating oil is perpendicular to the direction of gas leakage, which hinders the gas leakage in the top gap. In addition, since the gas working medium leakage flow rate at the top gap is large and the pressure is small, it is conducive to the entrainment of the lubricating oil injected from the oil injection hole, effectively preventing gas leakage. On the other hand, by letting the lubricating oil enter the top gap, it helps to maintain a stable friction pair oil film at the top gap, improve the oil film carrying capacity, and thus reduce the friction loss between the vane and the rotor. Combining the above two points, the technical solution provided by the utility model can achieve the coupled optimization of friction and leakage at the top of the vane, thereby significantly improving the efficiency of the rolling rotor compressor.

[0005] In order to achieve the purpose of the utility model, the technical solution adopted by the utility model is:

[0006] The utility model discloses a rolling rotor type compressor with oil injection lubrication, comprising a cylinder body, a rotor, a sliding vane and a spring, wherein a cavity with a circular cross-section is formed inside the cylinder body, an eccentric shaft is arranged in the axial direction of the cylinder body, and the rotor is eccentrically installed in the cavity of the cylinder body through the eccentric shaft; a sliding groove for sliding the sliding vane is arranged on the cylinder body; the sliding vane comprises a sliding vane top and a sliding vane bottom, a spring is connected between the bottom end wall of the sliding groove and the bottom of the sliding vane, and a top gap is formed between the sliding vane top and the rotor outer wall surface of the rotor; the inner wall of the cavity and the outer wall surface of the rotor are divided into an air intake cavity and an air exhaust cavity by the sliding vane, and an air intake port connected to the air intake cavity and an air exhaust port connected to the air exhaust cavity are respectively arranged on the cylinder body; a back pressure space is formed between the bottom end of the sliding groove and the bottom of the sliding vane, an oil injection hole is arranged in the middle part of the sliding vane along the vertical direction, and the back pressure space is connected with the top gap through the oil injection hole.

[0007] One or more oil injection holes are arranged in the middle of the sliding vane along the vertical direction.

[0008] The cross section of the oil injection hole is circular, square or irregular.

[0009] There is pressurized lubricating oil in the back pressure space, the pressure of the pressurized lubricating oil is greater than the pressure at the top gap, and the pressurized lubricating oil is sprayed into the top gap through the oil spray hole.

[0010] The pressurized lubricating oil is circulating lubricating oil after oil-gas separation or lubricating oil pressurized by a pump.

[0011] The outer wall of the eccentric shaft is provided with a key, the end of the rotor is provided with an eccentric shaft hole for installing the eccentric shaft, and the inner wall of the eccentric shaft hole is provided with a keyway matching the key.

[0012] The beneficial effects of the utility model are:

[0013] (1) The utility model provides an oil injection hole inside the vane to spray the lubricating oil after oil-gas separation or the lubricating oil after pressurization into the top gap. On the one hand, the flow direction of the injected lubricating oil is perpendicular to the direction of gas leakage, which hinders the gas leakage in the top gap. In addition, since the gas working medium leakage flow rate at the top gap is large and the pressure is small, it is conducive to the entrainment of the lubricating oil injected from the oil injection hole, effectively preventing gas leakage. On the other hand, by allowing the lubricating oil to enter the top gap, it helps to maintain a stable friction pair oil film at the top gap, improve the oil film carrying capacity, and thus reduce the friction loss between the vane and the rotor. Combining the above two points, the technical solution provided by the utility model can achieve the coupled optimization of friction and leakage at the top of the vane, thereby significantly improving the efficiency of the rolling rotor compressor. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is a schematic diagram of the structure of the utility model;

[0015] Figure 2 The schematic diagram of the sliding plate structure with one oil injection hole in the utility model is shown in FIG. Figure 1 ;

[0016] Figure 3 The schematic diagram of the sliding plate structure with one oil injection hole in the utility model is shown in FIG. Figure 2 ;

[0017] Figure 4 The schematic diagram of the sliding plate structure with 3 injection holes in the utility model Figure 1 ;

[0018] Figure 5 The schematic diagram of the sliding plate structure with 3 injection holes in the utility model Figure 2 ;

[0019] Figure 6 This is a schematic diagram of the sliding plate structure with a square oil injection hole in the utility model. Figure 1 ;

[0020] Figure 7 This is a schematic diagram of the sliding plate structure with a square oil injection hole in the utility model. Figure 2 .

[0021] In the figure: 1. Cylinder; 2. Cavity; 3. Rotor; 4. Slide; 5. Spring; 6. Slide groove; 7. Top of slide; 8. Key; 9. Bottom of slide; 10. Eccentric shaft; 11. Outer wall of rotor; 12. Top gap; 13. Oil injection hole; 14. Back pressure space; 15. Inlet port; 16. Exhaust port. DETAILED DESCRIPTION

[0022] The utility model is further described below:

[0023] See also Figure 1-7 ,

[0024] The utility model discloses a rolling rotor compressor with oil injection lubrication, comprising a cylinder body 1, a rotor 3, a vane 4 and a spring 5. A cavity 2 with a circular cross section is formed inside the cylinder body 1. An eccentric shaft 10 is provided in the axial direction of the cylinder body 1. The rotor 3 is eccentrically installed in the cavity 2 of the cylinder body 1 through the eccentric shaft 10. A slide groove 6 for sliding the vane 4 is provided on the cylinder body 1. The vane 4 comprises a vane top 7 and a vane bottom 9. A spring 5 is connected between the bottom end wall of the slide groove 6 and the vane bottom 9. A top gap is formed between the vane top 7 and the rotor outer wall surface 11 of the rotor 3. Gap 12; the inner wall of the cavity 2 and the outer wall surface 11 of the rotor are divided into an intake chamber and an exhaust chamber by the vane 4, and the cylinder body 1 is respectively provided with an intake port 15 connected to the intake chamber and an exhaust port 16 connected to the exhaust chamber; a back pressure space 14 is formed between the bottom end of the slide groove 6 and the bottom 9 of the vane, and an oil injection hole 13 is provided in the middle of the vane 4 along the vertical direction, and the back pressure space 14 is connected with the top gap 12 through the oil injection hole 13. The oil injection hole 13 is set inside the vane 4 through the above technical solution, and the lubricating oil after oil-gas separation or the lubricating oil after supercharging is sprayed into the top gap 12. On the one hand, the flow direction of the injected lubricating oil is perpendicular to the direction of gas leakage, which prevents gas leakage in the top gap. In addition, since the gas working medium leakage velocity at the top gap is large and the pressure is small, it is conducive to the entrainment of the lubricating oil injected from the oil injection hole, effectively preventing gas leakage. On the other hand, by letting the lubricating oil enter the top gap, it helps to maintain a stable friction pair oil film at the top gap, improve the oil film carrying capacity, and thus reduce the friction loss between the vane and the rotor. Combining the above two points, the technical solution provided by the utility model can achieve the coupled optimization of friction and leakage at the top of the vane, thereby significantly improving the efficiency of the rolling rotor compressor.

[0025] See also Figure 2-5 , the number of the oil injection holes 13 is one or more. Figure 2 The figure shows a situation where each slide 4 contains an oil injection hole 13. Figure 3 The illustrated embodiment shows a situation in which each sliding vane 4 includes three oil injection holes 13 .

[0026] See also Figure 2-7 The cross-sectional shape of the oil injection hole 13 is circular, square or irregular. Figure 2 and Figure 3 The figure shows the case where the cross-sectional shape of the oil injection hole 13 is circular. Figure 4 The illustrated case is where the cross-sectional shape of the oil injection hole 13 is a square.

[0027] See also Figure 2-7 The oil injection holes 13 are arranged along the center line direction of the blade, and the oil injection holes 13 pass through from the top 7 of the sliding vane to the bottom 9 of the sliding vane.

[0028] See also Figure 2, the back pressure space 14 contains pressurized lubricating oil. According to the operating parameter requirements, the pressurized lubricating oil is the circulating lubricating oil after oil and gas separation or the lubricating oil pressurized by a pump. The pressure of the lubricating oil after oil and gas separation is relatively high, and the leakage gas flow rate at the top gap 12 is relatively fast, resulting in the pressure at the back pressure space 13 being higher than the pressure at the top gap 12, thereby achieving the lubricating oil injection into the top gap 12. It should be pointed out that the circulating lubricating oil after oil and gas separation is an existing conventional technology and is not the object of protection of this patent, so this patent will not be repeated. If the injection pressure is to be further increased, the lubricating oil after oil and gas separation can be further pressurized by an external pump and then sprayed into the top gap. On the one hand, the flow direction of the injected lubricating oil is perpendicular to the direction of gas leakage, which prevents gas leakage at the top gap 12. Since the gas working medium leakage flow rate at the top gap 12 is large and the pressure is small, it is conducive to the entrainment of the lubricating oil injected from the oil injection hole 13, effectively preventing gas leakage, thereby improving volumetric efficiency; on the other hand, by letting the lubricating oil enter the top gap 12, it helps to maintain a stable friction pair oil film at the top gap 13, improve the oil film carrying capacity, thereby reducing the friction loss between the vane 4 and the rotor 3, thereby improving mechanical efficiency. Combining the above two points, the technical solution provided by the utility model can achieve the coupling optimization of friction and leakage at the top 7 of the vane, thereby significantly improving the efficiency of the rolling rotor compressor.

[0029] The oil-injection lubricated rolling rotor compressor of the utility model realizes the coupling optimization of friction and leakage by injecting the pressurized lubricating oil in the back pressure space 14 into the top gap 12. The advantages of the utility model are:

[0030] 1 A new type of oil-injection lubricated rolling rotor compressor structure is proposed, which has the advantages of simple structure, easy use, high efficiency and energy saving;

[0031] 2 A new type of rolling rotor compressor with oil injection lubrication is proposed, which can achieve coupling optimization of top friction and leakage and significantly improve the efficiency of the compressor compared with the existing technology;

[0032] The injection holes 13 may be provided with different shapes, quantities, injection pressures and other parameters as required to meet the process requirements of different speeds, flow rates and other working conditions.

[0033] 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 with oil injection lubrication, characterized in that: The invention comprises a cylinder body (1), a rotor (3), a sliding vane (4) and a spring (5); a cavity (2) with a circular cross section is formed inside the cylinder body (1); an eccentric shaft (10) is provided in the axial direction of the cylinder body (1); and the rotor (3) is eccentrically mounted in the cavity (2) of the cylinder body (1) via the eccentric shaft (10); The cylinder body (1) is provided with a slide groove (6) for the slide vane (4) to slide; the slide vane (4) comprises a slide vane top (7) and a slide vane bottom (9); a spring (5) is connected between the bottom end wall of the slide groove (6) and the slide vane bottom (9); a top gap (12) is formed between the slide vane top (7) and the rotor outer wall surface (11) of the rotor (3); the inner wall of the cavity (2) and the rotor outer wall surface (11) are separated into an air intake chamber and an air discharge chamber by the slide vane (4); the cylinder body (1) is provided with an air intake port (15) communicating with the air intake chamber and an air discharge port (16) communicating with the air discharge chamber; A back pressure space (14) is formed between the bottom end of the slide groove (6) and the bottom of the slide plate (9), and an oil injection hole (13) is provided in the middle of the slide plate (4) along the vertical direction. The back pressure space (14) is connected to the top gap (12) through the oil injection hole (13).

2. The rolling rotor compressor with oil injection lubrication according to claim 1, characterized in that: One or more oil injection holes (13) are provided in the middle of the sliding vane (4) along the vertical direction.

3. The rolling rotor compressor with oil injection lubrication according to claim 1, characterized in that: The cross section of the oil injection hole (13) is circular or square.

4. The rolling rotor compressor with oil injection lubrication according to claim 1, characterized in that: The back pressure space (14) contains pressurized lubricating oil, the pressure of which is greater than the pressure at the top gap (12), and the pressurized lubricating oil is sprayed into the top gap (12) through the oil spray hole (13).

5. The rolling rotor compressor with oil injection lubrication 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. The rolling rotor compressor with oil injection lubrication according to claim 1, characterized in that: The outer wall of the eccentric shaft (10) is provided with a key (8), the end of the rotor (3) is provided with an eccentric shaft hole for mounting the eccentric shaft (10), and the inner wall of the eccentric shaft hole is provided with a keyway matching the key (8).

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