JP3754213B2 - Rotary compressor - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a rotary compressor using carbon dioxide (CO ₂ ) among natural refrigerants.
[0002]
[Prior art]
Conventionally, chlorofluorocarbon (R11, R12, R134a, etc.) is generally used as a refrigerant in the refrigeration cycle. However, when CFCs are released into the atmosphere, they have problems such as a large warming effect and ozone layer destruction.
[0003]
For this reason, in recent years, other natural refrigerants having little influence on the environment, such as oxygen (O ₂ ), carbon dioxide (CO ₂ ), hydrocarbon (HC), ammonia (NH ₃ ), and water (H ₂ O), are used. Research on use as a refrigerant has been conducted.
[0004]
Among these natural refrigerants, oxygen and water cannot be used as refrigerants in a refrigeration cycle because of their low pressure even when used in a rotary compressor. Moreover, since ammonia and hydrocarbon are flammable, there is a problem that handling is difficult.
[0005]
For this reason, it has been desired to develop a compressor using CO _{2, that} is, carbon dioxide.
[0006]
Conventionally, there are roughly divided reciprocating and rotary (rotating) compressors, but the reciprocating compressor has problems of noise and vibration.
[0007]
Therefore, development of a rotary compressor using carbon dioxide is eagerly desired.
[0008]
Such a compressor using carbon dioxide is disclosed in Japanese Patent Laid-Open No. 10-19401 (F25B 9/06). This compressor is generally referred to as a Rotasco rotary compressor and is used for high pressure.
[0009]
[Problems to be solved by the invention]
However, with by the above-described such Rotasuko rotary compressor, when carbon dioxide is used as refrigerant, refrigerant pressure reaches even about 150 kg / cm ² G on the high pressure side, and the low-pressure side of about 30-40 kg / cm ² G Become.
[0010]
Thus, in the refrigeration cycle using carbon dioxide as the refrigerant, the refrigerant pressure is higher than that of Freon.
[0011]
Here, generally, a technique of using a silver-copper-zinc or alloy such as cadmium, nickel and tin called silver solder as a welding rod and brazing the refrigerant pipe directly to the sealed container has been used.
[0012]
However, in the case of a rotary compressor using carbon dioxide refrigerant, the internal pressure becomes higher than that of a compressor of chlorofluorocarbon refrigerant. It was.
[0013]
The present invention has been made in view of the above-described problems, and an object of the present invention is to prevent damage to the connection portion between the sealed container and the refrigerant pipe as much as possible.
[0014]
[Means for Solving the Problems]
As means for achieving the above object, in the invention of claim 1, the upper and lower cylinders whose both end openings are closed, the rollers rotating in the cylinders, and the compression space in the cylinders by contacting the rollers. In a two-cylinder rotary compressor that stores a rotary compression element composed of a vane that forms a closed container and compresses and discharges the sucked refrigerant by the rotary compression element,
Upper and lower introduction pipes provided in the upper and lower cylinders for introducing a refrigerant, a joint base provided corresponding to the upper and lower introduction pipes and welded or integrally formed with the sealed container, and bolts attached to the joint base Provided is a rotary compressor comprising an integrated joint that is stopped and connects the upper and lower introduction pipes and the refrigerant pipe, and a packing interposed between the joint base and the joint.
[0015]
According to a second aspect of the present invention, the rotation includes upper and lower cylinders whose openings at both ends are closed, a roller that rotates in the cylinder, and a vane that forms a compression space in the cylinder by contacting the roller. In a two-cylinder rotary compressor that stores a compression element in a sealed container and compresses and discharges the sucked refrigerant by the rotary compression element,
Upper and lower outlets that are provided in the upper and lower cylinders and discharge the refrigerant; a joint base that is provided corresponding to the upper and lower outlet pipes and that is welded or integrally formed with the sealed container; and bolted to the joint base The rotary compressor includes an integral joint that connects the upper and lower outlet pipes and the refrigerant pipe, and a packing that is interposed between the joint base and the joint.
[0016]
Thus, in the inventions of claims 1 and 2, the refrigerant pipe is attached to the joint, the joint base is provided in the sealed container, and the joint is fixed to the joint base. Therefore, the joint base reinforces the sealed container, It is possible to prevent damage from the joint base portion of the sealed container, that is, the refrigerant pipe mounting portion as much as possible.
[0017]
Moreover, in invention of Claim 3, the said refrigerant | coolant is a carbon dioxide, The rotary compressor of Claim 1 or Claim 2 is provided.
[0018]
In particular, even when carbon dioxide having a high pressure is used as a refrigerant, it has a sufficient refrigerating capacity.
[0019]
DETAILED DESCRIPTION OF THE INVENTION
An embodiment of the present invention will be described below with reference to the drawings.
[0020]
FIG. 1 is a longitudinal sectional view of a two-cylinder rotary compressor equipped with the present invention, FIG. 2 is an enlarged view of the main part of a two-cylinder rotary compressor equipped with the present invention, and FIG. FIG. 4 is a Mollier diagram in a refrigerant circuit diagram using a two-cylinder rotary compressor equipped with the present invention.
[0021]
Reference numeral 1 in FIG. 1 denotes a two-cylinder rotary compressor (rotary compressor) provided with the present invention, and an electric element 3 provided in an upper portion of a sealed container 2 made of metal such as iron, and the electric element 3. , And a rotary compression element 5 that is rotationally driven by the rotary shaft 4 of the electric element 3.
[0022]
The sealed container 2 has an oil reservoir 2C at the lower part, and includes a container body 2A for housing the electric element 3 and the rotary compression element 5, and a sealed lid 2B for sealing the container body 2A. A terminal terminal (wiring is omitted) 6 for supplying electric power to the electric element 3 is attached to 2B.
[0023]
The electric element 3 is composed of a rotor 7 and a stator 8. The rotor 7 is formed by providing a permanent magnet (not shown) inside a laminated body 10 made of laminated electromagnetic steel plates. A winding 11 is attached to a laminate 12 in which steel plates are laminated. In addition, 9 is a balancer.
This structure is referred to as a DC motor, but a motor referred to as an AC motor in which an aluminum core made of aluminum is inserted into laminated electromagnetic steel sheets may be used.
[0024]
Furthermore, when used for an air conditioner such as an automobile, the engine of the automobile may be used as a drive source, or another drive source.
[0025]
The rotary compression element 5 includes a plate middle (intermediate partition plate) 13, upper and lower cylinders 14 and 15 attached to the upper and lower sides of the plate middle 13, and an upper and lower eccentric portion of the rotary shaft 4 in the upper and lower cylinders 14 and 15. Upper and lower rollers 18 and 19 rotated by 16, 17; upper and lower vanes which are in contact with the upper and lower rollers 18 and 19 and divide the upper and lower cylinders 14 and 15 into a high pressure chamber and a low pressure chamber; The main frame 22 and the bearing plate 23 are configured to block the opening and allow the rotation shaft 4 to rotate.
[0026]
Further, these are arranged in the order of the main frame 22, the upper cylinder 14, the plate middle 13, the lower cylinder 15, and the bearing plate 23, and are connected by bolts 24.
[0027]
The rotary shaft 4 is provided with oil supply holes 25 for supplying lubricating oil, that is, oil A to the sliding portions of the rotary compression element 5. Further, an oil supply groove 26 that communicates with the oil supply hole 25 and guides the oil A to the inside of the upper and lower rollers 18 and 19 is formed on the outer peripheral surface of the rotary shaft 4. Further, the upper and lower vanes are provided with springs for always urging the upper and lower rollers 18 and 19.
[0028]
Here, the oil A as the lubricating oil may be an existing oil such as mineral oil (mineral oil), alkylbenzene oil, ether oil, or ester oil.
[0029]
The upper and lower cylinders 14 and 15 are provided with upper and lower introduction pipes 28 and 29 for introducing refrigerant as refrigerant paths, and upper and lower outlet pipes 30 and 31 for discharging refrigerant as refrigerant paths, respectively. . Then, refrigerant pipes 32, 33, and 34 are connected to the upper and lower introduction pipes 28 and 29 and the upper and lower outlet pipes 30 and 31 via a suction joint 45 and a discharge joint 46, respectively.
[0030]
The suction joint 45 is provided with introduction side insertion pipes 47, 47 to be inserted into the upper and lower introduction pipes 28, 29. A double rubber packing is provided on the outer periphery of the leading end of the introduction side insertion pipes 47, 47. 48 and 48 are provided. The suction joint 45 is made of iron or stainless steel.
[0031]
Further, an iron suction joint base 49 is welded to the suction joint 45 mounting position of the sealed container 2, and the suction joint 45 is a suction joint as a fixing means to the suction joint base 49 via a Teflon packing 55. It is screwed with a connecting bolt 50. The suction joint base 49 is formed with a hole through which the introduction side insertion tubes 47 and 47 of the suction joint 45 are inserted.
[0032]
Further, the suction joint base 49 is formed of iron, which is the same material as the sealed container 2, and is welded to the sealed container 2. However, when mounting by welding, dissimilar metals can be welded. Alternatively, the stainless steel suction joint base 49 may be welded to the iron hermetic container 2.
[0033]
Here, when both the sealed container 2 and the suction joint base 49 are iron, welding methods such as arc welding, gas welding, thermite welding, electroslag welding, electron beam welding, plasma arc welding, laser beam welding, and hard brazing. Is used.
[0034]
In addition, when welding the stainless steel suction joint base 49 to the iron sealed container 2, gas welding, covering arc welding, inert gas welding, electron beam welding, spot / seam welding (pressure welding), spark butt welding (pressure welding) Welding methods such as brazing are used.
[0035]
Further, the sealed container 2 and the suction joint base 49 may be integrally formed. That is, the container body 2A of the sealed container 2 is manufactured by pouring a liquid iron material heated into a mold into a mold, and at this time, a mold in which the suction joint base 49 is integrated is used.
[0036]
The inner circumferences of the open ends of the upper and lower introduction pipes 28 and 29 are inclined to facilitate the insertion of the introduction side insertion pipes 47 and 47, and the introduction side insertion pipe 47 of the suction joint 45 is formed. , 47 also has an inclined opening end outer periphery.
[0037]
In addition, 51 is a pressure regulating pipe for preventing leakage from between the main frame 22 or the bearing plate 23 and the rotating shaft 4 and the like, and 35 is for supporting the sealed container 2. A pedestal 36 is a suction muffler.
[0038]
Next, the discharge joint 46 is provided with outlet side insertion pipes 52, 52 to be inserted into the upper and lower outlet pipes 30, 31. The rubber packing is provided. The discharge joint 46 is made of iron or stainless steel.
[0039]
Further, an iron discharge joint base 49 is welded to the discharge joint 46 mounting position of the hermetic container 2, and the discharge joint 46 is a fixing means to the discharge joint base 49 via a Teflon packing 56. It is screwed with a connecting bolt 54. The discharge joint base 49 is formed with a hole through which the outlet side insertion pipes 52 and 52 of the discharge joint 46 are inserted.
[0040]
Furthermore, the discharge joint base 49 is formed of iron, which is the same material as the sealed container 2, and is welded to the sealed container 2. However, when mounting by welding, dissimilar metals can be welded. Alternatively, the discharge joint base 49 made of stainless steel may be welded to the airtight container 2 made of iron.
[0041]
Here, when both the sealed container 2 and the discharge joint base 49 are iron, welding methods such as arc welding, gas welding, thermite welding, electroslag welding, electron beam welding, plasma arc welding, laser beam welding, and hard brazing. Is used.
[0042]
In addition, when welding the discharge joint base 49 made of stainless steel to the iron sealed container 2, gas welding, covering arc welding, inert gas welding, electron beam welding, spot / seam welding (pressure welding), spark butt welding (pressure welding) Welding methods such as brazing are used.
[0043]
Further, the sealed container 2 and the discharge joint base 49 may be integrally formed. That is, the container body 2A of the sealed container 2 is manufactured by pouring an iron raw material that is heated to a mold into a liquid state, and at this time, a mold in which the discharge joint base 49 is integrated is used.
[0044]
Further, the inner circumferences of the open ends of the upper and lower outlet pipes 30 and 31 are inclined in order to facilitate the insertion of the outlet side insertion pipes 52 and 52, and the outlet side insertion pipes 52 of the discharge joint 46 are formed. , 52 also has an inclined opening end outer periphery.
[0045]
The rotary compressor 1 described above is a two-cylinder rotary compressor 1 that uses carbon dioxide as a refrigerant and has an internal low pressure or an internal intermediate pressure. The refrigerant circuit of the rotary compressor 1 will be described below with reference to FIGS. This will be described with reference to FIG.
[0046]
In the case of the two-cylinder rotary compressor 1, the discharge-side refrigerant pipe 32 and the condenser 37 are connected via a lower outlet pipe 31 and a discharge joint 46 provided in the lower cylinder 15 of the rotary compressor 1. The condenser 37 and the cooler 38 are connected by a refrigerant pipe 40 via an expansion valve 39. Further, the cooler 38 and the upper introduction pipe of the upper cylinder 14 of the rotary compressor 1 are connected by the suction side refrigerant pipe 33 through the suction joint 45.
[0047]
Furthermore, the refrigerant pipe 40 that connects the condenser 37 and the expansion valve 39 is provided with a bypass pipe 43 that is connected to the supercooler 42 via the bypass expansion valve 41.
[0048]
The supercooler refrigerant pipe 44 from the supercooler 42 is a connecting refrigerant pipe that connects the upper outlet pipe 30 provided in the upper cylinder 14 of the rotary compressor 1 and the lower inlet pipe 29 of the lower cylinder 15. 34 and the suction muffler 36.
[0049]
The connection refrigerant pipe 34 is connected to the upper outlet pipe 30 via a discharge joint 46 and is connected to the lower introduction pipe 29 via a suction joint 45.
[0050]
In addition, the said supercooler 42 is comprised with a double pipe, and the refrigerant | coolant from the said bypass pipe 43 flows inside, and the refrigerant | coolant of the said refrigerant | coolant piping 40 flows outside. Conversely, the inside may be the refrigerant pipe 40 and the outside may be the bypass pipe 43.
[0051]
Furthermore, the structure provided in thermal conductive contact may be used.
[0052]
The refrigerant pipe 40 branched from the bypass pipe 43 is introduced into the supercooler 42, and is provided in contact with the bypass pipe 43 after the bypass expansion valve 41 so as to conduct heat in the supercooler 42. It has been. Thereafter, it is connected to the expansion valve 39 described above.
[0053]
Therefore, the gas refrigerant of carbon dioxide which has been compressed by the two-cylinder rotary compressor 1 and has reached a high temperature is cooled by the condenser 37, and further, heat exchange with the bypass pipe 43 by the subcooler 42, that is, After radiating heat, the expansion valve 39 expands. Thereafter, the gas refrigerant flowing into the cooler 38 and dissipating heat here returns to the rotary compressor 1 from the suction side refrigerant pipe 33 again.
[0054]
A part of the refrigerant condensed in the condenser 37 is diverted to the bypass pipe 43 and adiabatically expanded by the bypass expansion valve 41, and then collected from the refrigerant pipe 40 by the supercooler 42. The refrigerant collected by the supercooler 42 is mixed with the high-temperature and high-pressure refrigerant in the upper cylinder 14 to cool the high-temperature and high-pressure refrigerant and flow into the lower cylinder 15. Note that the refrigerant after collecting heat in the supercooler 42 is lower in temperature than the high temperature and high pressure refrigerant after the discharge of the upper cylinder 14.
[0055]
Here, in the case of a carbon dioxide refrigerant, the critical pressure shown in FIG. 4 is about 72 to 73 kgf / cm ² G, and the carbon dioxide refrigerant is gasified above the critical pressure, that is, in the supercritical region. .
[0056]
The point A in FIG. 4 is the refrigerant that is discharged from the supercooler 42 and the upper cylinder 14 of the compressor and is sucked into the lower cylinder 15, and the point B is the refrigerant that is discharged from the lower cylinder 15.
[0057]
Then, the point C is condensed by the condenser 37 and then diverted and adiabatically expanded by the bypass expansion valve 41. The point D is adiabatically expanded and the pressure is lowered, and the refrigerant dissipates heat and flows into the supercooler 42 to cool the point C refrigerant to the point E.
[0058]
Further, the supercooled refrigerant at the point E is adiabatically expanded by the expansion valve 39 to be in the state of the point F. Thereafter, as indicated by point G, the refrigerant that has collected heat by the cooler 38 and has reached a high temperature flows into the upper cylinder 14.
[0059]
As indicated by point H, the refrigerant that has been compressed by the upper cylinder 14 to become high temperature and high pressure is reduced in pressure by the above-described supercooler 42, and is used for supercooling, and the refrigerant that has risen in temperature (however, Thus, the high temperature after discharge of the upper cylinder 14 and the low temperature of the high pressure refrigerant) merge, and the refrigerant whose temperature has decreased flows into the rotary compressor 1 as indicated by point A.
[0060]
The rotary compressor 1 having the internal low pressure described above is (pressure in the sealed container 2) <(average pressure in the compression space of the upper cylinder 14) <(average pressure in the compression space of the lower cylinder 15). The rotary compressor 1 having the internal pressure of the internal pressure is defined as (average pressure in the compression space of the upper cylinder 14) <(pressure in the sealed container 2) <(lower cylinder) This is a rotary compressor 1 having a pressure relationship of (average pressure of 15 compression spaces).
[0061]
Further, the rotary compressor 1 described in detail above includes a home air conditioner, a commercial air conditioner (package air conditioner), an automotive air conditioner, a home refrigerator, a commercial refrigerator, a commercial freezer, a commercial freezer refrigerator, a showcase, an automatic Used for vending machines, water heaters, etc.
[0062]
Further, the rotary compressor 1 has a size of 15 frames and an output of 1 horsepower.
[0063]
【The invention's effect】
As described above in detail, according to the first and second aspects of the invention, the refrigerant pipe is attached to the joint, the joint base is provided in the sealed container, and the joint is fixed to the joint base with bolts. The airtight container can be reinforced to prevent damage from the joint base portion of the airtight container, that is, the refrigerant pipe mounting portion as much as possible, thereby improving the reliability of the rotary compressor.
[0064]
Further, according to the invention of claim 3, it is possible to provide a rotary compressor having a sufficient refrigeration capacity even when carbon dioxide having a high pressure is used as a refrigerant.
[Brief description of the drawings]
FIG. 1 is a longitudinal sectional view of a two-cylinder rotary compressor provided with the present invention.
FIG. 2 is an enlarged view of a main part of a two-cylinder rotary compressor provided with the present invention.
FIG. 3 is a refrigeration circuit diagram using a two-cylinder rotary compressor equipped with the present invention.
FIG. 4 is a Mollier diagram in a refrigerant circuit diagram using a two-cylinder rotary compressor including the present invention.
[Explanation of symbols]
A Oil 1 2 cylinder rotary compressor 2 Sealed container 5 Rotating compression element 13 Plate middle 14 Upper cylinder 15 Lower cylinder 18 Upper roller 19 Lower roller 22 Main frame 23 Bearing plate 28 Upper inlet pipe 29 Lower inlet pipe 30 Upper outlet pipe 31 Lower outlet pipe 32 Discharge side refrigerant pipe 33 Suction side refrigerant pipe 34 Connection refrigerant pipe 45 Suction joint 46 Discharge joint 49 Suction joint base 50 Suction joint connection bolt 53 Discharge joint base 54 Discharge joint connection bolt

Claims (3)

A rotary compression element comprising upper and lower cylinders closed at both ends, a roller that rotates in the cylinder, and a vane that forms a compression space in the cylinder by coming into contact with the roller is housed in a sealed container. A two-cylinder rotary compressor that compresses and discharges the sucked refrigerant by the rotary compression element;
Upper and lower introduction pipes provided in the upper and lower cylinders for introducing a refrigerant, a joint base provided corresponding to the upper and lower introduction pipes and welded or integrally formed with the sealed container, and bolts attached to the joint base A rotary compressor characterized by comprising an integrated joint that is fixed and connects the upper and lower introduction pipes and the refrigerant pipe, and a packing interposed between the joint base and the joint. A rotary compression element comprising upper and lower cylinders closed at both ends, a roller that rotates in the cylinder, and a vane that forms a compression space in the cylinder by coming into contact with the roller is housed in a sealed container. A two-cylinder rotary compressor that compresses and discharges the sucked refrigerant by the rotary compression element;
Upper and lower outlets that are provided in the upper and lower cylinders and discharge the refrigerant; a joint base that is provided corresponding to the upper and lower outlet pipes and that is welded or integrally formed with the sealed container; and bolted to the joint base A rotary compressor characterized by comprising an integral joint connecting the upper and lower outlet pipes and the refrigerant pipe, and a packing interposed between the joint base and the joint.   The rotary compressor according to claim 1 or 2, wherein the refrigerant is carbon dioxide.

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