Rotary compressor

Abstract

The invention belongs to the technical field of compressors, and discloses a rotary compressor. The low-pressure shell and the high-pressure shell are installed on the two sides of the cylinder cover, a low-pressure cavity is defined by the low-pressure shell and the cylinder cover, a high-pressure cavity is defined by the high-pressure shell and the cylinder cover, a motor is installed in a low-pressure cavity shell, a pump body assembly is installed in a high-pressure cavity shell, a crankshaft is arranged on the cylinder cover in a penetrating mode, one end of the crankshaft is connected with the motor, and the other end of the crankshaft is connected with the pump body assembly. The other end of the crankshaft is connected with the pump body assembly, the cylinder cover protrudes towards the low-pressure shell to form a journal part, the crankshaft is arranged in the journal part in a penetrating mode, a silencer is connected to the outer side of the journal part in a sleeved mode, a flowing hole is formed in the cylinder cover, an air inlet is formed in the low-pressure shell, and an exhaust port is formed in the high-pressure shell. The problems that in the prior art, a crankshaft of a pump body compressor needs to guarantee coaxiality with a plurality of parts at the same time, and the assembly difficulty is high are solved.

Description

Technical Field

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

[0002] The low-pressure chamber of the rotary compressor receives the gas-liquid mixed refrigerant from the evaporator, and the liquid refrigerant therein is evaporated into gaseous refrigerant through the heating of the motor during the rotation process, and the gaseous refrigerant is transported to the high-pressure chamber of the compressor, and the refrigerant is squeezed through the pump body assembly and finally discharged from the opening on one side of the high-pressure chamber. The motor drives the core crankshaft and the pump body assembly on the crankshaft to rotate. During the assembly process, the crankshaft needs to be inserted into the cylinder head, and a muffler is installed on the low-pressure chamber side of the cylinder head. The muffler can prevent the high-pressure side of the compressor from being damaged. The refrigerant enters the low-pressure side through the gap between the crankshaft and the cylinder head, and the crankshaft also has to pass through the muffler. The crankshaft, muffler and cylinder head need to be coaxially matched, which requires coaxiality between multiple parts. The assembly is difficult. In the subsequent use process, if the coaxial parts do not match, it will generate a lot of noise. At the same time, under the existing technology, the muffler is surrounded by a top cover, an annular plate and the cylinder head. A seal needs to be added between the top cover and the annular plate. At the same time, the crankshaft also needs to be fixed with bearings, which will increase the number of parts of the compressor, resulting in a more complicated assembly process and higher manufacturing costs. Summary of the invention

[0003] The object of the present invention is to provide a rotary compressor to solve the problem that the crankshaft of the pump compressor in the prior art needs to ensure coaxiality with multiple parts at the same time, resulting in high difficulty in assembly.

[0004] To achieve this object, the present invention adopts the following technical scheme: The present invention provides a rotary compressor, comprising a low-pressure shell, a high-pressure shell and a cylinder head, the low-pressure shell and the high-pressure shell are installed on both sides of the cylinder head, the low-pressure shell and the cylinder head enclose a low-pressure chamber, the high-pressure shell and the cylinder head enclose a high-pressure chamber, a motor is installed in the low-pressure chamber, a pump body assembly is installed in the high-pressure chamber, a crankshaft is passed through the cylinder head, one end of the crankshaft is connected to the motor, and the other end of the crankshaft is connected to the pump body assembly, the cylinder head protrudes toward the low-pressure shell to form a journal neck, the crankshaft is passed through the journal neck, a muffler is sleeved on the outer side of the journal neck, a flow hole is provided on the cylinder head, an air inlet is provided on the low-pressure shell, and an exhaust port is provided on the high-pressure shell.

[0005] Preferably, the muffler is in the shape of a cover, and the muffler and the cylinder head form a muffler cavity. The pump body assembly is mounted on the pump body screw hole on the cylinder head through pump body bolts, and the bottom of the pump body screw hole is arranged in the muffler cavity.

[0006] Preferably, the silencer is screwed onto the cylinder head via a silencer bolt, a silencer screw hole is provided on the cylinder head, the silencer bolt passes through the silencer and is screwed into the silencer screw hole, a sealing gasket is installed between the silencer and the cylinder head, a silencer through hole is provided on the sealing gasket, and the silencer bolt passes through the silencer through hole.

[0007] Preferably, along the axial direction of the crankshaft, the journal portion is embedded in the muffler, and the circumference of the journal portion is sealed and connected to the muffler at a contact point.

[0008] Preferably, a limiting protrusion is formed on one side of the muffler close to the neck portion, the limiting protrusion abuts against the neck portion, a groove is formed in the limiting protrusion, a sealing ring is installed in the groove, and the sealing ring abuts against the neck portion.

[0009] Preferably, along the crankshaft axis direction, the journal portion passes through and protrudes from the muffler.

[0010] Preferably, along the axial direction of the crankshaft, the length of the journal portion is greater than 20 mm, and the journal portion does not contact the rotor of the motor.

[0011] Preferably, a flange hole is formed on the circumferential edge of the cylinder head, and external protrusions are respectively provided on the low-pressure housing and the high-pressure housing corresponding to the positions of the flange holes. Fastening bolts pass through the flange holes and the external protrusions to fix the low-pressure housing, the high-pressure housing and the cylinder head together.

[0012] Preferably, a first notch area is formed on the edge of the muffler chamber shell, and a second notch area is formed on the sealing gasket, the first notch area overlaps with the second notch area, and the flow hole is arranged at the overlap of the first notch area and the second notch area.

[0013] Preferably, convex ribs are formed on both sides of the sealing gasket, the convex ribs abut against the muffler, and the convex ribs can also abut against the cylinder head.

[0014] Preferably, the cylinder head is made of cast iron, preferably FC250, and the muffler is made of aluminum alloy.

[0015] Beneficial effects: By extending the length of the journal neck and sleeved the muffler on the outside of the journal neck, the crankshaft only contacts the journal neck of the cylinder head during assembly, reducing the number of parts in contact with the crankshaft, reducing the difficulty of assembly, and making the assembly more precise. The muffler only needs to be assembled with the journal neck, reducing the number of parts assembled with the muffler, further reducing the difficulty of assembly, and simplifying the processing technology of the compressor. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 is a cross-sectional view of a rotary compressor of the present invention;

[0017] Figure 2 It is a schematic diagram of the installation of the muffler of the present invention;

[0018] Figure 3 It is a main body diagram of the sealing gasket of the present invention.

[0019] In the figure: 1. low-pressure shell; 11. air inlet; 2. high-pressure shell; 21. exhaust port; 3. cylinder head; 31. journal neck; 32. flow hole; 4. motor; 5. pump body assembly; 6. crankshaft; 7. muffler; 71. muffler chamber; 72. muffler bolt; 8. pump body bolt; 9. sealing gasket; 91. muffler through hole; 10. limiting protrusion; 101. groove; 20. sealing ring; 30. flange hole; 40. fastening bolt; 50. first notch area; 60. second notch area. DETAILED DESCRIPTION

[0020] The present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It is to be understood that the specific embodiments described herein are only used to explain the present invention, rather than to limit the present invention. It should also be noted that, for ease of description, only parts related to the present invention, rather than all structures, are shown in the accompanying drawings.

[0021] In the description of the present invention, unless otherwise clearly specified and limited, the terms "connected", "connected", and "fixed" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0022] In the present invention, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may include that the first and second features are in direct contact, or may include that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, a first feature being "above", "above" and "above" a second feature includes that the first feature is directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. A first feature being "below", "below" and "below" a second feature includes that the first feature is directly below and obliquely below the second feature, or simply indicates that the first feature is lower in level than the second feature.

[0023] In the description of this embodiment, the terms "upper", "lower", "right", etc., directions or positional relationships are based on the directions or positional relationships shown in the drawings, and are only for the convenience of description and simplification of operation, rather than indicating or implying that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as limiting the present invention. In addition, the terms "first" and "second" are only used to distinguish in the description and have no special meaning.

[0024] Under the existing technology, the crankshaft needs to cooperate with bearings, cylinder heads, mufflers and other components during the assembly process. At the same time, it is necessary to ensure the coaxiality of the crankshaft during rotation within the above-mentioned parts to avoid unnecessary noise. However, this will lead to a more complicated assembly process, a higher difficulty in assembly, and reduced processing efficiency.

[0025] In order to solve the above problems, Figures 1 to 3 As shown, the present invention provides a rotary compressor, which includes a low-pressure shell 1, a high-pressure shell 2 and a cylinder head 3. The low-pressure shell 1 and the high-pressure shell 2 are installed on both sides of the cylinder head 3. The low-pressure shell 1 and the cylinder head 3 enclose a low-pressure chamber, and the high-pressure shell 2 and the cylinder head 3 enclose a high-pressure chamber. A motor 4 is installed in the low-pressure chamber, and a pump body assembly 5 is installed in the high-pressure chamber. A crankshaft 6 is passed through the cylinder head 3, one end of the crankshaft 6 is connected to the motor 4, and the other end of the crankshaft 6 is connected to the pump body assembly 5. The cylinder head 3 protrudes toward the low-pressure shell 1 to form a journal portion, the crankshaft 6 is passed through the journal portion, and a muffler 7 is sleeved on the outer side of the journal portion. A flow hole 32 is provided on the cylinder head 3, an air inlet 11 is provided on the low-pressure shell 1, and an exhaust port 21 is provided on the high-pressure shell 2.

[0026] During the operation of the rotary compressor, the low-pressure shell 1 and the cylinder head 3 form a low-pressure chamber, and the high-pressure shell 2 and the cylinder head 3 form a high-pressure chamber. A motor 4 is installed in the low-pressure chamber, and a pump body assembly 5 is installed in the high-pressure chamber. The high-pressure chamber and the low-pressure chamber on both sides of the cylinder head 3 are connected through the flow hole 32. When the refrigerant mixed with gas and liquid enters the low-pressure chamber through the air inlet 11, the heat generated by the rotation of the motor 4 causes the liquid refrigerant to vaporize and finally enter the high-pressure chamber along the flow hole 32. Then, the gaseous refrigerant entering the high-pressure chamber is pressurized by the pump body assembly 5, and finally the high-pressure gaseous refrigerant is sent out from the exhaust port 21. High-pressure housing 2, during operation, crankshaft 6 rotates driven by the rotor of motor 4. Cylinder head 3 of the present invention extends to one side of motor 4 to form a journal neck, and a circular hole is formed in journal neck 31. Crankshaft 6 is inserted into the circular hole. During assembly, only the coaxiality of crankshaft 6 and journal neck needs to be adjusted, which reduces the difficulty of matching with crankshaft 6 in rotary compressor and simplifies assembly process. Meanwhile, muffler 7 is installed on the outside of journal neck 31. During installation, only the relative position of journal neck and muffler 7 needs to be adjusted, and journal neck 31 and muffler 7 are relatively stationary objects, which facilitates relative position adjustment during installation and simplifies installation process. It should be noted that cylinder head 3 is made of cast iron material FC250, and muffler 7 is made of aluminum alloy. Aluminum alloy has higher strength and can adapt to the high-pressure environment inside. Cylinder head 3 and muffler 7 are not limited to the above materials.

[0027] The muffler 7 of the present invention is in the shape of a cover. The muffler 7 and the cylinder head 3 form a muffler chamber 71. The pump body assembly 5 is installed on the pump body screw hole on the cylinder head 3 through the pump body bolts 8. The bottom of the pump body screw hole is set in the muffler chamber 71.

[0028] The muffler 7 of the present invention is integrally formed and is in the shape of a cover. The muffler 7 is directly buckled on the screw hole of the pump body. On the one hand, the cavity of the muffler 7 can intercept the noise generated from the side of the high-pressure chamber, thereby reducing the noise level of the overall rotary compressor. At the same time, since the cavity in the muffler 7 is connected to the high-pressure chamber, the isolation of the muffler 7 can prevent the high-pressure chamber from leaking from the screw hole side of the pump body to the low-pressure chamber, thereby improving the air tightness.

[0029] The silencer 7 is screwed onto the cylinder head 3 via a silencer bolt 72. A silencer screw hole is provided on the cylinder head 3. The silencer bolt 72 passes through the silencer 7 and is screwed into the silencer screw hole. A sealing gasket 9 is installed between the silencer 7 and the cylinder head 3. A silencer through hole 91 is provided on the sealing gasket 9. The silencer bolt 72 passes through the silencer through hole 91.

[0030] Along the axial direction of the crankshaft 6, the journal 31 is embedded in the muffler 7, and the circumferential contact between the journal 31 and the muffler 7 is sealed and connected, so that when the crankshaft 6 is in the position of the cylinder head, it is only released from the journal 31, which reduces the difficulty of assembly and improves the sealing performance.

[0031] Installing a sealing gasket 9 between the muffler 7 and the cylinder head 3 can make the sealing ability between the muffler 7 and the cylinder head 3 higher, and prevent the high-pressure refrigerant from leaking from the gap between the muffler 7 and the cylinder head 3 to the low-pressure chamber. Since the muffler 7 is integrally formed into a cover shape, only the sealing gasket 9 and the sealing ring 20 are required during the installation of the muffler 7 and the cylinder head 3, which reduces the number of parts and simplifies the installation process.

[0032] A limiting protrusion 10 is formed on one side of the muffler 7 close to the shaft neck, and the limiting protrusion 10 abuts against the shaft neck. A groove 101 is formed in the limiting protrusion 10, and a sealing ring 20 is installed in the groove 101, and the sealing ring 20 abuts against the shaft neck.

[0033] A sealing ring 20 is sleeved between the muffler 7 and the shaft neck 31. The sealing ring 20 can seal the gap between the shaft neck 31 and the limiting protrusion 10, so that the air tightness inside the muffler 7 is better, avoiding the high pressure inside the muffler 7 from leaking into the low pressure chamber, and improving the sealing performance.

[0034] Along the axial direction of the crankshaft 6, the journal portion 31 passes through and protrudes from the muffler 7, so that the muffler 7 only contacts the journal portion 31, thereby reducing the number of parts in contact and reducing noise; the journal portion 31 protrudes from the muffler 7, extending the support area for the crankshaft 6 and reducing disturbance of the crankshaft 6.

[0035] Specifically, in the present invention, along the axial direction of the crankshaft 6, the length of the journal portion is greater than 20 mm. The length of the journal portion greater than 20 mm can be installed with an integrally formed muffler 7, reducing the number of parts that need to cooperate with the crankshaft 6. The journal and the rotor of the motor 4 do not contact each other, so that the rotor can avoid colliding with the journal portion during rotation, thereby reducing noise.

[0036] A fixing hole is formed in the rotor of the motor 4, and the crankshaft 6 is inserted in the fixing hole. The crankshaft 6 of the present invention is inserted in the motor 4. In one embodiment, only the motor 4 is required to fix the crankshaft 6, and no other bearings are required. One end of the crankshaft 6 is a free end, which can reduce the number of contacts between the crankshaft 6 and the remaining parts, reduce the difficulty of assembling the rotary compressor, and appropriately shorten the length of the crankshaft 6. The crankshaft 6 is fixed only by the fixing hole in the motor 4 to achieve the installation of the crankshaft 6. At the same time, the crankshaft 6 is supported by the shaft neck 31 to reduce the disturbance of the crankshaft 6.

[0037] A flange hole 30 is formed on the circumferential edge of the cylinder head 3, and the fastening bolts 40 pass through the flange holes 30 to fix the low-pressure shell 1, the high-pressure shell 2 and the cylinder head 3 in connection. Specifically, in the present invention, the high-pressure shell 2 and the flange hole 30 are screwed into the low-pressure shell 1, and the high-pressure shell 2, the cylinder head 3 and the low-pressure shell 1 can be fastened together by the fastening bolts 40. At the same time, the fastening bolts 40 can also pass through the low-pressure shell 1 and be screwed into the high-pressure shell 2 to realize the assembly of the rotary compressor.

[0038] A first notch area 50 is formed at the edge of the muffler 7, and a second notch area 60 is also formed at the sealing gasket 9. The flow hole 32 is arranged at the overlap of the first notch area 50 and the second notch area 60. A depression is formed on one side of the muffler chamber 71, forming a first notch area 50. When projected along the axial direction of the crankshaft 6, the flow hole 32 is opened in the area where the first notch area 50 and the second notch area 60 overlap, so that sufficient area can be reserved for the flow hole 32. At the same time, in order to adapt the sealing gasket 9, the sealing gasket 9 between the muffler 7 and the cylinder head 3 is also cut out with a second notch area 60, so that the contact surface between the muffler 7 and the cylinder head 3 has the same shape as the sealing gasket 9, leaving space for the flow hole 32, so that the aperture of the flow hole 32 can be opened according to specific requirements.

[0039] Convex ribs are formed on both sides of the sealing gasket 9, which abut against the muffler 7 and can also abut against the cylinder head 3. By installing ribs on both sides of the sealing gasket 9, the ribs can be squeezed and deformed during the process of installing the muffler 7 on the cylinder head 3, so that the sealing gasket 9 has better sealing performance and avoids leakage of the high-pressure refrigerant in the muffler 7.

[0040] Obviously, the above embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the embodiments of the present invention. For those skilled in the art, various obvious changes, readjustments and substitutions can be made without departing from the protection scope of the present invention. It is not necessary and impossible to list all the embodiments here. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the claims of the present invention.

Claims

1. A rotary compressor, characterized in that: The invention comprises a low-pressure housing (1), a high-pressure housing (2) and a cylinder head (3), wherein the low-pressure housing (1) and the high-pressure housing (2) are mounted on both sides of the cylinder head (3), the low-pressure housing (1) and the cylinder head (3) enclose a low-pressure chamber, the high-pressure housing (2) and the cylinder head (3) enclose a high-pressure chamber, a motor (4) is mounted in the low-pressure chamber, a pump body assembly (5) is mounted in the high-pressure chamber, a crankshaft (6) is passed through the cylinder head (3), one end of the crankshaft (6) is connected to the cylinder head (3), and a pump body assembly (5) is mounted in the cylinder head (3). The motor (4) is connected to the crankshaft (6), the other end of which is connected to the pump body assembly (5), the cylinder head (3) protrudes toward the low-pressure housing (1) to form a shaft neck (31), the crankshaft (6) is inserted into the shaft neck (31), a muffler (7) is sleeved on the outer side of the shaft neck (31), a flow hole (32) is provided on the cylinder head (3), an air inlet (11) is provided on the low-pressure housing (1), and an exhaust port (21) is provided on the high-pressure housing (2).

2. The rotary compressor according to claim 1, characterized in that: The muffler (7) is in the shape of a cover, and the muffler (7) and the cylinder head (3) enclose a muffler chamber (71); the pump body assembly (5) is mounted on the pump body screw hole on the cylinder head (3) via a pump body bolt (8), and the bottom of the pump body screw hole is arranged in the muffler chamber (71).

3. The rotary compressor according to claim 2, characterized in that: The silencer (7) is screwed onto the cylinder head (3) via a silencer bolt (72); a silencer screw hole is provided on the cylinder head (3); the silencer bolt (72) passes through the silencer (7) and is screwed into the silencer screw hole; a sealing gasket (9) is installed between the silencer (7) and the cylinder head (3); a silencer through hole (91) is provided on the sealing gasket (9); the silencer bolt (72) passes through the silencer through hole (91).

4. The rotary compressor according to claim 1, characterized in that: Along the axial direction of the crankshaft (6), the journal portion (31) is embedded in the muffler (7), and the circumference of the journal portion (31) is sealed and connected to the muffler (7).

5. The rotary compressor according to claim 4, characterized in that: A limiting protrusion (10) is formed on one side of the muffler (7) close to the shaft neck portion (31), the limiting protrusion (10) abuts against the shaft neck portion (31), a groove (101) is formed in the limiting protrusion (10), a sealing ring (20) is installed in the groove (101), and the sealing ring (20) abuts against the shaft neck portion (31).

6. The rotary compressor according to claim 1, characterized in that: Along the axial direction of the crankshaft (6), the journal portion (31) passes through and protrudes from the muffler (7).

7. The rotary compressor according to claim 6, characterized in that: Along the axial direction of the crankshaft (6), the length of the journal portion (31) is greater than 20 mm, and the journal portion (31) and the rotor of the motor (4) do not contact each other.

8. The rotary compressor according to claim 1, characterized in that: A flange hole (30) is formed on the circumferential edge of the cylinder head (3), and external protrusions are respectively provided on the low-pressure shell (1) and the high-pressure shell (2) at the position corresponding to the flange hole (30). Fastening bolts (40) pass through the flange hole (30) and the external protrusions to fix the low-pressure shell (1), the high-pressure shell (2) and the cylinder head (3) in connection.

9. The rotary compressor according to claim 3, characterized in that: The edge of the shell of the muffler chamber (71) is formed with a first notch area (50), the sealing gasket (9) is also formed with a second notch area (60), the first notch area (50) overlaps with the second notch area (60), and the flow hole (32) is arranged at the overlap of the first notch area (50) and the second notch area (60).

10. The rotary compressor according to claim 3, characterized in that: The sealing gasket (9) is provided with convex ribs on both sides, the convex ribs abut against the muffler (7), and the convex ribs can also abut against the cylinder head (3).

11. The rotary compressor according to claim 1, characterized in that: The cylinder head (3) is made of cast iron, and the muffler (7) is made of aluminum alloy.

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