Horizontal two-stage rolling rotor compressor

Abstract

The invention discloses a horizontal two-stage rolling rotor compressor which comprises an outer shell, an air inlet and an air outlet are formed in the outer shell, a pump body is arranged in the outer shell and divides the interior of the outer shell into a high-pressure cavity and a medium-pressure cavity, the high-pressure cavity is connected with the air outlet, and the medium-pressure cavity is connected with the air outlet. The pump body is provided with a first-stage air cylinder hole and a second-stage air cylinder hole, the first-stage air cylinder hole is in butt joint with the air inlet, the first-stage air cylinder hole is provided with a first-stage air cylinder outlet communicated with the medium-pressure cavity, and the second-stage air cylinder hole is provided with a second-stage air cylinder inlet communicated with the medium-pressure cavity. A second-stage air cylinder outlet communicated with the high-pressure cavity is formed in the second-stage air cylinder hole; the device has the advantages of being high in working efficiency, stable in working and simple in structure.

Description

Technical Field

[0001] The invention belongs to the technical field of compressors, and in particular relates to a horizontal two-stage rolling rotor compressor. Background Art

[0002] There are two types of rotary compressors, one is the stator type and the other is the vane type. The rotor of the stator type rotary compressor is mounted on an eccentric shaft. When rotating, the volume changes and the cylinder is separated by the stator. This type of compressor must be equipped with a one-way valve on the exhaust or suction pipeline to prevent the refrigerant from flowing back from the condenser to the evaporator when shut down. The vane type rotary compressor is very similar to a vane pump. There is no sealing ring, and the centrifugal force and lubricating oil, as well as the eccentricity of the rotor to the cylinder, are used to achieve the close fit between the blade and the cylinder. Whether it is good or not is closely related to the supply of lubricating oil.

[0003] The composition of the rolling rotor compressor mainly includes the rolling rotor, cylinder, vane, cylinder end cover, eccentric shaft, motor assembly and compressor assembly. The rolling rotor and cylinder are the core components of the rolling rotor compressor, in which the rolling rotor is installed on the rotating shaft, and the cylinder provides the compression space. The vane is installed in the cylinder and works with the rolling rotor to assist the compression process. The cylinder end cover is used to seal the cylinder to ensure the sealing of the compression process. The eccentric shaft is connected to the rolling rotor. Through the rotation of the eccentric shaft, the rolling rotor slides in the cylinder to achieve gas compression. The motor assembly includes a stator and a rotor, which provides power for the entire compressor. The compressor assembly includes a crankshaft, an upper bearing, a lower bearing, and an exhaust valve plate. These components work together to ensure the normal operation of the compressor.

[0004] The problem with the prior art is that when the existing rolling rotor compressor is working, the gas is directly sucked into the cylinder, compressed, and then discharged into the compressor casing. Since the gas density at the inlet end is small, the suction efficiency is low, and the space at the outlet end is large, the overall working efficiency of the compressor is low; since the overall air pressure in the compressor casing is high, the overall thickness and strength of the casing are required to be high, which leads to increased costs and increased leakage risks, affecting working stability. Summary of the invention

[0005] The purpose of the present invention is to provide a horizontal two-stage rolling rotor compressor with the advantages of high working efficiency, stable operation and simple structure in view of the problems existing in the prior art.

[0006] To achieve the above-mentioned purpose, the technical solution adopted by the present invention is: a horizontal two-stage rolling rotor compressor, including an outer shell, the outer shell is provided with an air inlet and an exhaust port, the outer shell is provided with a pump body, the pump body divides the interior of the outer shell into a high-pressure cavity and a medium-pressure cavity, the high-pressure cavity is connected to the exhaust port, the pump body is provided with a primary cylinder hole and a secondary cylinder hole, the primary cylinder hole is connected to the air inlet, the primary cylinder hole is provided with a primary cylinder outlet connected to the medium-pressure cavity, the secondary cylinder hole is provided with a secondary cylinder inlet connected to the medium-pressure cavity, and the secondary cylinder hole is provided with a secondary cylinder outlet connected to the high-pressure cavity.

[0007] In the above scheme, an air inlet and an exhaust port are provided on the outer shell to realize air intake and exhaust. The pump body is installed in the outer shell, and the inner part of the outer shell is divided into a high-pressure cavity and a medium-pressure cavity. The low-pressure gas at the air inlet is directly introduced into the first-stage cylinder hole for compression. The compressed gas is discharged from the first-stage cylinder outlet into the medium-pressure cavity. The gas in the medium-pressure cavity enters the second-stage cylinder hole through the second-stage cylinder inlet for compression. The compressed gas is discharged from the second-stage cylinder outlet to the high-pressure cavity and finally discharged from the compressor from the exhaust port. The suction efficiency during the second-stage compression is improved by the structure of the two-stage compression, while the pressure on the outer shell at the medium-pressure cavity is reduced, so that the shell thickness can be reduced and the risk of leakage can be reduced.

[0008] Furthermore, a connecting groove is provided in the outer shell, an annular connecting portion is provided in the middle of the connecting groove, a mounting portion 1 for engaging with the connecting groove is provided on the pump body, a sealing ring 1 is provided between the mounting portion 1 and the connecting groove, a mounting portion 2 for engaging with the annular connecting portion is provided on the pump body, a sealing ring 2 is provided between the mounting portion 2 and the annular connecting portion, and the high-pressure cavity is formed between the connecting groove, the annular connecting portion and the pump body.

[0009] The connecting groove is used to engage with the first mounting part, and the sealing ring is used to achieve a sealed connection. The second mounting part is engaged with the annular connecting part, and the sealing ring is used to achieve a sealed connection, thereby forming a sealed annular high-pressure cavity structure.

[0010] Furthermore, the outer rings of the mounting part 1 and the mounting part 2 are respectively provided with an annular groove, and the sealing ring 1 and the sealing ring 2 are respectively arranged in the annular groove.

[0011] The annular groove is provided to position the sealing ring 1 and the sealing ring 2 to ensure the sealing of the connection.

[0012] Furthermore, the pump body includes a crankshaft and a cylinder head 1, a cylinder part 1, a middle partition, a cylinder part 2, and a cylinder head 2 which are connected in sequence by a fastener 1; the crankshaft is rotatably connected to the middle of the cylinder head 1, the cylinder part 1, the middle partition, the cylinder part 2, and the cylinder head 2; rolling pistons are arranged in the cylinder part 1 and the cylinder part 2, and the rolling pistons are both rotatably connected to the crankshaft.

[0013] The cylinder head 1, the cylinder part 1, the middle partition, the cylinder part 2, and the cylinder head 2 are connected in sequence by fastener 1. The assembly is simple and the structure is stable. The rolling piston is driven to rotate by the eccentric part of the crankshaft to achieve gas compression. The middle part of the cylinder part 1 is provided with a primary cylinder hole, and the middle part of the cylinder part 2 is provided with a secondary cylinder hole.

[0014] Furthermore, the cylinder head 2 includes a mounting portion 1 and a mounting portion 2, and the cylinder head 1 is connected to the outer shell through a fastener 2.

[0015] The first installation part, the second installation part and the second cylinder cover are integrally arranged, the structure is simple, and the installation is convenient; the first cylinder cover is connected with the outer shell through the second fastener to realize the fastening of the pump body.

[0016] Furthermore, a docking pipe is provided between the air inlet and the first-stage cylinder hole.

[0017] A butt joint pipe is provided to achieve a sealed connection between the air inlet and the first-stage cylinder hole, thereby preventing leakage of medium-pressure gas in the medium-pressure cavity.

[0018] Furthermore, the outer shell includes a shell portion and a cover portion, and the shell portion and the cover portion are connected via fasteners.

[0019] The fasteners are used to facilitate connection and disassembly between the shell body and the cover body, and the manufacturing is simple.

[0020] Furthermore, a motor is disposed in the outer shell, and the crankshaft is connected to the motor rotor.

[0021] The motor rotor rotates to drive the crankshaft and rolling piston to achieve the gas compression function.

[0022] Compared with the prior art, the present invention has the following beneficial effects: 1. The first-stage cylinder hole and the second-stage cylinder hole are arranged on the pump body to cooperate with the crankshaft and the rolling piston to perform two-stage compression on the gas, and the medium-pressure gas after the initial compression is discharged into the outer shell, and then enters the second-stage cylinder hole for the second compression, and the medium-pressure gas is compressed into high-pressure gas, and the high-pressure gas is discharged from the compressor after passing through the high-pressure cavity and the exhaust port. Through the two-stage compression method, the intake efficiency during the second compression is improved, thereby improving the overall working efficiency of the compressor; 2. By separating the medium-pressure cavity and the high-pressure cavity inside the outer shell, the high-pressure end is concentrated, which is beneficial to reduce the thickness and strength of the outer shell corresponding to the medium-pressure cavity, which is convenient for cost saving; the corresponding gas leakage risk is reduced, and the working stability is good; 3. The two-stage compression method is helpful to reduce the compression ratio during each compression, making the compressor work stably. By setting up a high-pressure cavity separately for exhaust, it is avoided that the oil is brought out from the high-pressure cavity, and the compressor works stably; 4. Two consecutive compressions of gas can be achieved through one pump body structure, with good compression effect and simple structure. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 This is a structural front view of a horizontal two-stage rolling rotor compressor according to embodiment 1 of the present invention; Figure 2 for Figure 1 Sectional view at AA in the middle; Figure 3 for Figure 1 Cross-section at the middle BB; Figure 4 It is a structural schematic diagram of the annular slot in Embodiment 1 of the present invention; Figure 5 It is a structural stereogram of a horizontal two-stage rolling rotor compressor according to embodiment 1 of the present invention; In the figure: 1. Shell; 2. Cover; 3. Exhaust port; 4. Inlet port; 5. High-pressure cavity; 6. Medium-pressure cavity; 7. First-stage cylinder hole; 8. Second-stage cylinder hole; 9. First-stage cylinder outlet; 10. Second-stage cylinder inlet; 11. Second-stage cylinder outlet; 12. Connecting groove; 13. Annular connecting part; 14. Mounting part one; 15. Mounting part two; 16. Sealing ring one; 17. Sealing ring two; 18. Annular groove; 19. Fastener one; 20. Fastener two; 21. Fastener three; 22. Cylinder head one; 23. Cylinder part one; 24. Middle partition; 25. Cylinder part two; 26. Cylinder head two; 27. Crankshaft; 28. Rolling piston; 29. ​​Docking pipe; 30. Motor; 31. Oil hole. DETAILED DESCRIPTION

[0024] The technical solution of the present invention will be clearly and completely described below in conjunction with the drawings in the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all of the embodiments. Based on the embodiments in the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention. In the description of the present invention, it should be noted that the terms front, back, left, right, etc. indicating directions or positional relationships are based on the directions or positional relationships shown in the drawings, or are the directions or positional relationships in which the invented product is usually placed when used. They are only for the convenience of describing the present invention or simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed or operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention. Example 1

[0025] like Figure 1-5 As shown, a horizontal two-stage rolling rotor compressor includes an outer shell, which is provided with an air inlet 4 and an exhaust port 3, and a pump body is arranged in the outer shell. The pump body divides the interior of the outer shell into a high-pressure cavity 5 and a medium-pressure cavity 6, and the high-pressure cavity 5 is connected to the exhaust port 3. The pump body is provided with a primary cylinder hole 7 and a secondary cylinder hole 8, and the primary cylinder hole 7 is connected to the air inlet 4. A primary cylinder outlet 9 connected to the medium-pressure cavity 6 is provided at the primary cylinder hole 7, a secondary cylinder inlet 10 connected to the medium-pressure cavity 6 is provided at the secondary cylinder hole 8, and a secondary cylinder outlet 11 connected to the high-pressure cavity 5 is provided at the secondary cylinder hole 8.

[0026] In the above scheme, an air inlet 4 and an exhaust port 3 are provided on the outer shell to realize air intake and exhaust. The pump body is installed in the outer shell, and the inner part of the outer shell is divided into a high-pressure cavity 5 and a medium-pressure cavity 6. The low-pressure gas at the air inlet 4 is directly introduced into the first-stage cylinder hole 7 for compression, and the compressed gas is discharged from the first-stage cylinder outlet 9 into the medium-pressure cavity 6. The gas in the medium-pressure cavity 6 enters the second-stage cylinder hole 8 through the second-stage cylinder inlet 10 for compression, and the compressed gas is discharged from the second-stage cylinder outlet 11 to the high-pressure cavity 5, and finally discharged from the compressor from the exhaust port 3. The suction efficiency during the second-stage compression is improved by the structure of the two-stage compression, and at the same time, the pressure on the outer shell at the medium-pressure cavity 6 is reduced, so that the shell thickness can be reduced and the risk of leakage can be reduced.

[0027] Furthermore, a connecting groove 12 is provided in the outer shell, an annular connecting portion 13 is provided in the middle of the connecting groove 12, a mounting portion 14 for engaging with the connecting groove 12 is provided on the pump body, a sealing ring 16 is provided between the mounting portion 14 and the connecting groove 12, a mounting portion 15 for engaging with the annular connecting portion 13 is provided on the pump body, a sealing ring 17 is provided between the mounting portion 15 and the annular connecting portion 13, and the high-pressure cavity 5 is formed between the connecting groove 12, the annular connecting portion 13 and the pump body.

[0028] The connecting groove 12 is used to engage with the mounting portion 14 and cooperate with the sealing ring 16 to achieve a sealed connection. The mounting portion 2 15 is used to engage with the annular connecting portion 13 and cooperate with the sealing ring 2 17 to achieve a sealed connection, thereby forming a sealed annular high-pressure cavity 5 structure.

[0029] A groove is provided in the middle of the annular connecting portion 13 for connecting with the second mounting portion 15, a connecting hole is provided in the middle of the second mounting portion 15 for connecting with the crankshaft 27, and an oil hole 31 is provided between the groove and the medium-pressure cavity for oil flow at the end of the crankshaft 27. The cross sections of the connecting groove 12 and the annular connecting portion 13 are both circular, and the connecting groove 12 and the annular connecting portion 13 are concentrically arranged.

[0030] Furthermore, the outer rings of the mounting portion 14 and the mounting portion 2 15 are respectively provided with an annular groove 18 , and the sealing ring 1 16 and the sealing ring 2 17 are respectively arranged in the annular groove 18 .

[0031] The annular groove 18 is provided to position the sealing ring 16 and the sealing ring 2 17 to ensure the sealing of the connection.

[0032] The sealing ring 17 can be arranged on the inner side, end surface or outer side of the annular connecting portion 13 according to requirements.

[0033] Furthermore, the pump body includes a crankshaft 27 and a cylinder head 22, a cylinder part 23, a middle partition 24, a cylinder part 25, and a cylinder head 26 which are connected in sequence through a fastener 19. The crankshaft 27 is rotatably connected to the middle of the cylinder head 22, the cylinder part 23, the middle partition 24, the cylinder part 25, and the cylinder head 26. Rolling pistons 28 are provided in the cylinder part 1 23 and the cylinder part 25, and the rolling pistons 28 are rotatably connected to the crankshaft 27.

[0034] The cylinder head 1 22, the cylinder part 1 23, the middle partition 24, the cylinder part 25, and the cylinder head 26 are connected in sequence by the fastener 19. The assembly is simple and the structure is stable. The rolling piston 28 is driven to rotate by the eccentric part of the crankshaft 27 to achieve gas compression. The middle part of the cylinder part 1 23 is provided with a primary cylinder hole 7, and the middle part of the cylinder part 25 is provided with a secondary cylinder hole 8.

[0035] Cylinder part 1 23 and cylinder part 2 25 are provided with springs and slides to cooperate with rolling piston 28. Cylinder cover 1 22 and cylinder cover 26 are provided with one-way opening exhaust valves to prevent gas backflow. The positions of the exhaust valves correspond to the first cylinder outlet 9 and the second cylinder outlet 11. Fastener 1 19, fastener 20 and fastener 3 21 include bolts, and fastener 1 19 is provided with three bolts along the circumferential direction.

[0036] Furthermore, the cylinder head 26 includes a mounting portion 14 and a mounting portion 15 , and the cylinder head 22 is connected to the outer shell through a fastener 20 .

[0037] The mounting part 14, the mounting part 2 15 and the cylinder cover 2 26 are integrally arranged, with a simple structure and convenient installation. The cylinder cover 1 22 is connected to the outer shell through the fastener 20 to achieve the fastening of the pump body.

[0038] The outer shell is provided with a threaded hole inside to cooperate with the fastener 20.

[0039] Furthermore, a docking pipe 29 is provided between the air inlet 4 and the first-stage cylinder hole 7 .

[0040] The butt joint pipe 29 is provided to achieve a sealed connection between the air inlet 4 and the first-stage cylinder hole 7 , thereby preventing leakage of the medium-pressure gas in the medium-pressure chamber 6 .

[0041] The docking pipe 29 and the cylinder part 23 can be fixedly connected or connected by a sealing ring, and the docking pipe 29 and the air inlet 4 can be fixedly connected or detachably connected.

[0042] Furthermore, the outer shell includes a shell portion 1 and a cover portion 2, and the shell portion 1 and the cover portion 2 are connected via a fastener 21.

[0043] The fastener 3 21 facilitates the connection and disassembly between the shell body 1 and the cover body 2, and the manufacturing is simple.

[0044] A sealing ring may be provided between the shell body 1 and the cover body 2 for sealing.

[0045] Furthermore, a motor 30 is disposed in the outer shell, and the crankshaft 27 is connected to the rotor of the motor 30 .

[0046] The rotation of the rotor of the motor 30 drives the crankshaft 27 and the rolling piston 28 to move, thereby realizing the gas compression function.

[0047] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A horizontal two-stage rolling rotor compressor, comprising an outer shell, an air inlet and an air outlet are provided on the outer shell, a pump body is arranged in the outer shell, and the compressor is characterized in that: The pump body divides the interior of the outer shell into a high-pressure cavity and a medium-pressure cavity. The high-pressure cavity is connected to the exhaust port. A primary cylinder hole and a secondary cylinder hole are opened on the pump body. The primary cylinder hole is connected to the air inlet. A primary cylinder outlet connected to the medium-pressure cavity is opened at the primary cylinder hole. A secondary cylinder inlet connected to the medium-pressure cavity is opened at the secondary cylinder hole. A secondary cylinder outlet connected to the high-pressure cavity is opened at the secondary cylinder hole.

2. The horizontal two-stage rolling rotor compressor according to claim 1, characterized in that: A connecting groove is provided in the outer shell, an annular connecting part is provided in the middle of the connecting groove, a mounting part 1 for engaging with the connecting groove is provided on the pump body, a sealing ring 1 is provided between the mounting part 1 and the connecting groove, a mounting part 2 for engaging with the annular connecting part is provided on the pump body, a sealing ring 2 is provided between the mounting part 2 and the annular connecting part, and the high-pressure cavity is formed between the connecting groove, the annular connecting part and the pump body.

3. The horizontal two-stage rolling rotor compressor according to claim 2, characterized in that: The outer rings of the mounting part 1 and the mounting part 2 are respectively provided with an annular groove, and the sealing ring 1 and the sealing ring 2 are respectively arranged in the annular groove.

4. The horizontal two-stage rolling rotor compressor according to claim 2, characterized in that: The pump body includes a crankshaft and a cylinder head 1, a cylinder part 1, a middle partition, a cylinder part 2, and a cylinder head 2 which are connected in sequence by a fastener 1. The crankshaft is rotatably connected to the middle parts of the cylinder head 1, the cylinder part 1, the middle partition, the cylinder part 2, and the cylinder head 2. Rolling pistons are arranged in the cylinder part 1 and the cylinder part 2, and the rolling pistons are both rotatably connected to the crankshaft.

5. The horizontal two-stage rolling rotor compressor according to claim 4, characterized in that: The cylinder cover 2 comprises a mounting portion 1 and a mounting portion 2, and the cylinder cover 1 is connected to the outer shell through a fastener 2.

6. The horizontal two-stage rolling rotor compressor according to claim 1, characterized in that: A butt joint pipe is arranged between the air inlet and the first-stage cylinder hole.

7. The horizontal two-stage rolling rotor compressor according to claim 1, characterized in that: The outer shell comprises a shell part and a cover part, and the shell part and the cover part are connected by fasteners.

8. The horizontal two-stage rolling rotor compressor according to claim 4, characterized in that: A motor is arranged in the outer shell, and the crankshaft is connected to the motor rotor.

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