Rotary compressor

Abstract

The utility model 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 utility model relates to a compressor technical field especially relates to a rotary compressor. BACKGROUND

[0002] Rotary compressor low pressure chamber receives gas-liquid mixed refrigerant from evaporator, through the heating in the rotation process of motor, evaporate the liquid refrigerant among them to gaseous refrigerant, deliver gaseous refrigerant to the high pressure chamber of compressor, through pump body assembly extrude refrigerant and finally discharge refrigerant from the opening of high pressure chamber side, wherein motor drives core crankshaft and the pump body assembly on crankshaft rotate, in the assembly process, need to insert crankshaft in cylinder cover, and assemble silencer on the low pressure chamber side of cylinder cover, silencer can prevent the refrigerant of high pressure side in compressor from entering the low pressure side in the gap between crankshaft and cylinder cover, crankshaft also passes through silencer, and the coaxial cooperation between crankshaft, silencer and cylinder cover is needed, so that the coaxial degree is formed between multiple parts, and the assembly difficulty is high, in the subsequent use process, if the coaxial part is not matched, it can produce larger noise, and under the prior art, the silencer is surrounded by top cover, annular plate and cylinder cover, and sealing element needs to be added between top cover and annular plate, and bearing is also needed to be used to fix crankshaft, so that the number of parts of compressor is increased, leading to that the assembly process is more complicated and the manufacturing cost is higher. SUMMARY

[0003] The utility model aims at providing a rotary compressor, solves the problem that the crankshaft of pump body compressor needs to ensure the coaxial degree with multiple parts simultaneously under the prior art, and the assembly difficulty is high.

[0004] To achieve this purpose, the utility model adopts the following technical scheme: the utility model provides a rotary compressor, including low pressure casing, high pressure casing and cylinder cover, the low pressure casing with the high pressure casing is installed in the both sides of the cylinder cover, the low pressure casing with the cylinder cover is enclosed into low pressure chamber, the high pressure casing with the cylinder cover is enclosed into high pressure chamber, the motor is installed in the low pressure chamber, the pump body assembly is installed in the high pressure chamber, the crankshaft is worn in the cylinder cover, one end of the crankshaft is connected with the motor, the other end of the crankshaft is connected with the pump body assembly, the cylinder cover is protruded to the low pressure casing and forms the journal portion, the crankshaft is worn in the journal portion, the silencer is sleeved on the outside of the journal portion, the flow hole is set up on the cylinder cover, the air inlet is set up on the low pressure casing, the exhaust port is set up on the high pressure casing.

[0005] As preferred, the silencer is cover-shaped, the silencer and the cylinder cover enclose the silencing cavity, the pump body assembly is installed on the pump body screw hole on the cylinder cover through pump body bolt, and the bottom of the pump body screw hole is arranged in the silencing cavity.

[0006] As preferably, the silencer is screwed on the cylinder cover through silencing bolts, the cylinder cover is provided with silencing bolt holes, the silencing bolts pass through the silencing holes and are screwed in the silencing bolt holes, a sealing gasket is installed between the silencer and the cylinder cover, the sealing gasket is provided with a silencing through hole, and the silencing bolts pass through the silencing through hole.

[0007] As preferably, along the direction of the crankshaft axis, the journal portion is embedded in the silencer, and the journal portion is sealingly connected with the silencer at the contact position.

[0008] As preferably, the silencer is provided with a limiting protrusion near the journal portion, the limiting protrusion abuts against the journal portion, the limiting protrusion is provided with a groove, and a sealing ring is installed in the groove and abuts against the journal portion.

[0009] As preferably, along the direction of the crankshaft axis, the journal portion passes through and protrudes from the silencer.

[0010] As preferably, along the direction of the crankshaft axis, the length of the journal portion is greater than 20 mm, and the journal portion and the rotor of the motor do not abut against each other.

[0011] As preferably, the circumferential edge of the cylinder cover is provided with a flange hole, the low-pressure shell and the high-pressure shell are respectively provided with outer protrusions at positions corresponding to the flange hole, and fastening bolts pass through the flange hole and the outer protrusions to fixedly connect the low-pressure shell, the high-pressure shell and the cylinder cover.

[0012] As preferably, the edge of the silencer cavity shell is provided with a first notch area, the sealing gasket is also provided with a second notch area, the first notch area coincides with the second notch area, and the flow hole is arranged at the position where the first notch area and the second notch area coincide.

[0013] As preferably, the sealing gasket is provided with a protruding rib on both sides, the protruding rib abuts against the silencer, and the protruding rib can also abut against the cylinder cover.

[0014] As preferably, the material of the cylinder cover is cast iron, preferably FC250, and the material of the silencer is aluminum alloy.

[0015] Beneficial effects: By prolonging the length of the journal portion and sleeving the silencer on the outside of the journal portion, the crankshaft only contacts the journal portion of the cylinder cover during assembly, the number of parts in contact with the crankshaft is reduced, the assembly difficulty is reduced, the assembly precision is higher, the silencer only needs to be assembled with the journal portion, the number of parts assembled with the silencer is reduced, the assembly difficulty is further reduced, and the machining process of the compressor is simplified. BRIEF DESCRIPTION OF DRAWINGS

[0016] Fig. 1 is a cross section view of the rotary compressor of the utility model;

[0017] Fig. 2 is a mounting schematic view of the muffler of the utility model;

[0018] Fig. 3 is a main body view of the sealing gasket of the utility model.

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

[0020] The utility model will be further explained in detail below in combination with the drawings and examples.It can be understood that the specific examples described herein are only used to explain the utility model and are not limited to the utility model.In addition, it should be noted that, in order to facilitate the description, only the part related to the utility model is shown in the drawings, not all the structures.

[0021] In the description of the utility model, unless otherwise explicitly specified and limited, the terms "connected", "connected", "fixed" should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or it can be integrated;It can be mechanically connected, or it can be electrically connected;It can be directly connected, or it can be indirectly connected through an intermediate medium, or it can be the communication between two elements or the interaction relationship between two elements.For ordinary skilled in the art, the specific meaning of the above terms in the utility model can be understood according to the specific circumstances.

[0022] In the utility model, unless otherwise explicitly specified and limited, the first feature "on" or "below" the second feature can include that the first and second features are in direct contact, or that the first and second features are not in direct contact but are in contact through another feature between them.In addition, the first feature "on", "above" and "above" the second feature includes that the first feature is directly above and obliquely above the second feature, or only indicates that the horizontal height of the first feature is higher than that of the second feature.The first feature "below", "below" and "below" the second feature includes that the first feature is directly below and obliquely below the second feature, or only indicates that the horizontal height of the first feature is less than that of the second feature.

[0023] In the description of this embodiment, the terms "upper," "lower," "right," etc., refer to the orientation or positional relationship shown in the accompanying drawings. They are used only for ease of description and simplification of operation, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model. In addition, the terms "first" and "second" are only used for distinction in description and have no special meaning.

[0024] Under current technology, the crankshaft needs to cooperate with components such as bearings, cylinder heads, and mufflers during the assembly process. At the same time, it is necessary to ensure the coaxiality of the crankshaft during rotation within these components to avoid unnecessary noise. However, this makes the assembly process more complex, the assembly difficulty higher, and reduces processing efficiency.

[0025] To solve the above problems, such as Figs. 1 to 3 As shown, this utility model provides a rotary compressor, including a low-pressure housing 1, a high-pressure housing 2, and a cylinder head 3. The low-pressure housing 1 and the high-pressure housing 2 are installed on both sides of the cylinder head 3. The low-pressure housing 1 and the cylinder head 3 form a low-pressure chamber, and the high-pressure housing 2 and the cylinder head 3 form a high-pressure chamber. A motor 4 is installed in the low-pressure chamber, and a pump assembly 5 is installed in the high-pressure chamber. A crankshaft 6 is installed on 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 assembly 5. The cylinder head 3 protrudes towards the low-pressure housing 1 to form a journal. The crankshaft 6 passes through the journal, and a muffler 7 is sleeved on the outside of the journal. 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.

[0026] During the working process of the rotary compressor, the low-pressure shell 1 and the cylinder cover 3 form a low-pressure cavity, the high-pressure shell 2 and the cylinder cover 3 form a high-pressure cavity, the motor 4 is installed in the low-pressure cavity, the pump body assembly 5 is installed in the high-pressure cavity, the high-pressure cavity and the low-pressure cavity on both sides of the cylinder cover 3 are communicated through the flow hole 32, the gaseous and liquid mixed refrigerant enters the low-pressure cavity through the gas inlet 11, then the heat generated by the rotation of the motor 4 makes the liquid refrigerant gasify, finally enters the high-pressure cavity on one side through the flow hole 32, then the gaseous refrigerant entering the high-pressure cavity on one side is pressurized by the pump body assembly 5, finally the high-pressure gaseous refrigerant is sent out from the gas outlet 21 side of the high-pressure shell 2, during the working process, the crankshaft 6 rotates under the driving of the rotor of the motor 4, the cylinder cover 3 of the utility model extends to the motor 4 side and forms a shaft neck part, a circular hole is formed in the shaft neck part 31, the crankshaft 6 is arranged in the circular hole, during the assembling process, only the coaxial degree of the crankshaft 6 and the shaft neck part needs to be adjusted, the difficulty of cooperation between the rotary compressor and the crankshaft 6 is reduced, the assembling process is simplified, meanwhile, the outer side of the shaft neck part 31 is provided with the silencer 7, during the assembling process, only the relative position of the shaft neck part and the silencer 7 needs to be adjusted, the shaft neck part 31 and the silencer 7 are relatively static objects, the relative position is convenient to adjust during the assembling process, and the assembling process is simplified. It needs to be specially pointed out that the material of the cylinder cover 3 is cast iron material FC250, the material of the silencer 7 is aluminum alloy, the strength of the aluminum alloy is higher, and the aluminum alloy can adapt to the high-pressure environment in the silencer 7, and the materials of the cylinder cover 3 and the silencer 7 are not limited to the above materials.

[0027] The silencer 7 of the utility model is cover-shaped, the silencer 7 and the cylinder cover 3 form a silencing cavity 71, the pump body assembly 5 is installed on the pump body screw hole on the cylinder cover 3 through the pump body bolt 8, and the bottom of the pump body screw hole is arranged in the silencing cavity 71.

[0028] The silencer 7 of the utility model is integrally formed, the silencer 7 is cover-shaped, the silencer 7 is directly buckled on the pump body screw hole, on the one hand, the cavity of the silencer 7 can intercept the noise generated from the high-pressure cavity side, the noise volume of the whole rotary compressor is reduced, and simultaneously, since the cavity in the silencer 7 is communicated with the high-pressure cavity, the high-pressure cavity is prevented from leaking from the pump body screw hole side to the low-pressure cavity through the isolation of the silencer 7, and the air tightness is improved.

[0029] The silencer 7 is screwed on the cylinder cover 3 through the silencing bolt 72, the silencing screw hole is formed in the cylinder cover 3, the silencing bolt 72 is screwed in the silencing screw hole through the silencer 7, the sealing gasket 9 is installed between the silencer 7 and the cylinder cover 3, the silencing through hole 91 is formed in the sealing gasket 9, and the silencing bolt 72 passes through the silencing through hole 91.

[0030] In the axial direction of the crankshaft 6, the shaft neck part 31 is embedded in the silencer 7, the circumferential surface of the shaft neck part 31 is sealingly connected with the silencer 7, the crankshaft 6 is only connected with the shaft neck part 31 when being positioned on the cylinder cover, the assembling difficulty is reduced, and the sealing property is improved.

[0031] The sealing gasket 9 is arranged between the muffler 7 and the cylinder cover 3, so that the sealing ability between the muffler 7 and the cylinder cover 3 is higher, the sealing ability of the muffler 7 is higher, and the high-pressure refrigerant is prevented from leaking from the gap between the muffler 7 and the cylinder cover 3 to the low-pressure cavity. Since the muffler 7 is integrally formed in a cover shape, only the sealing gasket 9 and the sealing ring 20 are required during the cooperation and installation of the muffler 7 and the cylinder cover 3, the number of parts is reduced, and the installation process is simplified.

[0032] The muffler 7 is formed with a limiting protrusion 10 near the journal portion, the limiting protrusion 10 abuts against the journal portion, a groove 101 is formed in the limiting protrusion 10, and a sealing ring 20 is arranged in the groove 101 and abuts against the journal portion.

[0033] The sealing ring 20 is arranged between the muffler 7 and the journal portion 31, and the gap between the journal portion 31 and the limiting protrusion 10 is sealed by the sealing ring 20, so that the air tightness in the muffler 7 is better, the high pressure in the muffler 7 is prevented from leaking into the low-pressure cavity, and the sealing performance is improved.

[0034] In the axial direction of the crankshaft 6, the journal portion 31 penetrates and protrudes from the muffler 7, so that the muffler 7 only contacts the journal portion 31, the number of parts in contact is reduced, and noise is reduced; the journal portion 31 protrudes from the muffler 7, the support area of the crankshaft 6 is extended, and the disturbance of the crankshaft 6 is reduced.

[0035] Specifically, in the axial direction of the crankshaft 6 in the utility model, the length of the journal portion is greater than 20 mm, the length of the journal portion is greater than 20 mm, the integrally formed muffler 7 can be installed, the number of parts that need to cooperate with the crankshaft 6 is reduced, the journal portion and the rotor of the motor 4 do not contact each other, the rotor can be prevented from colliding with the journal portion during rotation, and noise is reduced.

[0036] The rotor of the motor 4 is formed with a fixing hole, and the crankshaft 6 is inserted into the fixing hole; in one embodiment of the utility model, the motor 4 only needs to fix the crankshaft 6, without other bearings; one end of the crankshaft 6 is a free end, so that the number of parts in contact with the crankshaft 6 is reduced, the assembly difficulty of the rotary compressor is reduced, the length of the crankshaft 6 is appropriately shortened, the crankshaft 6 is fixed only through the fixing hole in the motor 4, the installation of the crankshaft 6 is realized, and the crankshaft 6 is supported by the journal portion 31, so that the disturbance of the crankshaft 6 is reduced.

[0037] The flange hole 30 is formed in the circumferential edge of the cylinder cover 3, the low-pressure shell 1, the high-pressure shell 2 and the cylinder cover 3 are fixedly connected through the fastening bolt 40 passing through the flange hole 30, specifically, the high-pressure shell 2 and the flange hole 30 are screwed in the low-pressure shell 1, the high-pressure shell 2, the cylinder cover 3 and the low-pressure shell 1 can be fastened together through the fastening bolt 40, meanwhile, the fastening bolt 40 can also be screwed in the high-pressure shell 2 through the low-pressure shell 1, so that the assembly of the rotary compressor is realized.

[0038] The edge of the muffler 7 is formed with a first notch area 50, the sealing gasket 9 is also formed with a second notch area 60, the flow hole 32 is arranged at the overlapping position of the first notch area 50 and the second notch area 60, and a recess is formed on one side of the muffling cavity 71; the first notch area 50 is projected along the axis direction of the crankshaft 6, the flow hole 32 is arranged in the overlapping area of the first notch area 50 and the second notch area 60, sufficient space is reserved for the flow hole 32, and the sealing gasket 9 is adapted, the second notch area 60 is cut out in the sealing gasket 9 between the muffler 7 and the cylinder cover 3, the contact surface of the muffler 7 and the cylinder cover 3 is the same as the shape of the sealing gasket 9, space is reserved for the flow hole 32, and the hole diameter of the flow hole 32 can be arranged according to specific requirements.

[0039] The convex ribs are formed on the two sides of the sealing gasket 9, the convex ribs abut against the muffler 7 and the cylinder cover 3, the convex ribs are deformed by being extruded during the installation of the muffler 7 on the cylinder cover 3, the sealing gasket 9 has better sealing performance, and leakage of high-pressure refrigerant in the muffler 7 is avoided.

[0040] Obviously, the above embodiments of the utility model are only examples for clearly illustrating the utility model, and are not the limitation of the embodiments of the utility model. For ordinary skilled in the art, various obvious changes, re-adjustment and replacement can be made without departing from the protection scope of the utility model. Here, all the embodiments need not and cannot be exhausted. Any modification, equivalent replacement and improvement made in the spirit and principle of the utility model should be included in the protection scope of the utility model claim.

Claims

1. A rotary compressor characterized by comprising: The application relates to a cylinder head (3) which comprises a low-pressure shell (1) and a high-pressure shell (2) installed on both sides of the cylinder head (3), wherein the low-pressure shell (1) and the cylinder head (3) enclose a low-pressure cavity, the high-pressure shell (2) and the cylinder head (3) enclose a high-pressure cavity, a motor (4) is installed in the low-pressure cavity, a pump body assembly (5) is installed in the high-pressure cavity, a crankshaft (6) is arranged through the cylinder head (3), one end of the crankshaft (6) is connected with the motor (4), the other end of the crankshaft (6) is connected with the pump body assembly (5), the cylinder head (3) is protruded towards the low-pressure shell (1) to form a shaft neck portion (31), the crankshaft (6) is arranged through the shaft neck portion (31), a muffler (7) is sleeved outside the shaft neck portion (31), a flow hole (32) is arranged on the cylinder head (3), an air inlet (11) is arranged on the low-pressure shell (1), and an air outlet (21) is arranged on the high-pressure shell (2).

2. The rotary compressor of claim 1, wherein The muffler (7) is in the form of a cover, the muffler (7) and the cylinder head (3) enclose a muffling cavity (71), the pump body assembly (5) is installed on a pump body screw hole on the cylinder head (3) through a pump body bolt (8), and the bottom of the pump body screw hole is arranged in the muffling cavity (71).

3. The rotary compressor of claim 2, wherein, The muffler (7) is screwed on the cylinder head (3) through a muffling bolt (72), a muffling screw hole is arranged on the cylinder head (3), the muffling bolt (72) is screwed in the muffling screw hole through the muffler (7), a sealing gasket (9) is arranged between the muffler (7) and the cylinder head (3), a muffling through hole (91) is arranged on the sealing gasket (9), and the muffling bolt (72) passes through the muffling through hole (91).

4. The rotary compressor of claim 1, wherein In the axial direction of the crankshaft (6), the shaft neck portion (31) is embedded in the muffler (7), and the circumferential surface of the shaft neck portion (31) is sealingly connected with the muffler (7).

5. The rotary compressor of claim 4, wherein, The muffler (7) is formed with a limiting protrusion (10) close to one side of 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), and a sealing ring (20) is arranged in the groove (101) and abuts against the shaft neck portion (31).

6. The rotary compressor of claim 1, wherein In the axial direction of the crankshaft (6), the shaft neck portion (31) passes through and protrudes from the muffler (7).

7. The rotary compressor of claim 6, wherein In the axial direction of the crankshaft (6), the length of the shaft neck portion (31) is greater than 20 mm, and the shaft neck portion (31) and a rotor of the motor (4) are not in contact with each other.

8. The rotary compressor of claim 1, wherein, The circumferential edge of the cylinder head (3) is formed with a flange hole (30), the low-pressure shell (1) and the high-pressure shell (2) are respectively provided with outer protrusions at positions corresponding to the flange hole (30), and a fastening bolt (40) passes through the flange hole (30) and the outer protrusions to fixedly connect the low-pressure shell (1), the high-pressure shell (2) and the cylinder head (3).

9. The rotary compressor of claim 3, wherein, The edge of the sound deadening cavity (71) housing is formed with a first notched area (50), the sealing gasket (9) is also formed with a second notched area (60), the first notched area (50) coincides with the second notched area (60), and the flow hole (32) is arranged at the coinciding position of the first notched area (50) and the second notched area (60).

10. The rotary compressor of claim 3, wherein The sealing gasket (9) is formed with a convex rib on both sides, the convex rib abuts against the silencer (7), and the convex rib can also abut against the cylinder head (3).

11. The rotary compressor of claim 1, wherein The material of the cylinder head (3) is cast iron, and the material of the silencer (7) is aluminum alloy.

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