JP2000104690A - Rotary compressor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent each vane as much as possible from jumping up, even in a case of a compressor employing carbon dioxide as cooling medium. SOLUTION: In this rotary compressor, a compression space is formed in the inside of a cylinder 14 and the like, with the cylinder 14 and the like of which openings are blocked at both the ends, a roller 18 and the like, which is rotated in the inside of the cylinder 14 and the like, and a vane 20 and the like, partitioning the space into a high pressure side, and a low pressure side, and the roller 18 form a rotary compression element and refrigerant is sucked to compress by the rotary compression element so as to be discharged out. In this case, carbon dioxide is used as refrigerant, and concurrently, the high pressure side of the vane 20 and the like are made perpendicular.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a rotary compressor using natural refrigerant, particularly carbon dioxide (CO ₂ ).

[0002]

2. Description of the Related Art As a prior art prior to the present invention, Japanese Patent No. 2517346 (F04B49 / 02) discloses:
A closed container having an oil reservoir at the bottom, a motorized element housed in the container, and a plurality of compression elements driven by the motorized element, the compression element is a cylinder,
A rotary shaft rotated by the electric element, a roller rotated along the inner wall of the cylinder by an eccentric portion of the rotary shaft, a vane reciprocatingly sliding in a groove provided in the cylinder in contact with the roller, A first oil supply passage for supplying oil from an oil reservoir to each sliding portion is provided on the rotating shaft; and a bearing for closing the opening of the cylinder. Is disclosed.

[0003]

By the way, when carbon dioxide is used as the refrigerant, the refrigerant pressure is about 100 at the high pressure side.
kg / cm ² G, and about 30 kg / cm ² on the low pressure side.
G.

[0004] Such a pressure difference causes a problem that the vane is pushed up and the vane flies, thereby lowering the compression efficiency.

The present invention has been made in view of such problems, and has as its object to prevent vane flying as much as possible even in a compressor using carbon dioxide as a refrigerant.

[0006]

In order to achieve the above object, according to the first aspect of the present invention, there is provided a cylinder having both ends closed, a roller rotating in the cylinder,
A compression space is formed in the cylinder by abutting on the rollers, and a rotary compression element including vanes partitioning between a high pressure side and a low pressure side is housed in a closed container, and the sucked refrigerant is passed through the rotary compression element. Provided is a rotary compressor that compresses and discharges, uses carbon dioxide as a refrigerant, and has a high-pressure side of the vane formed in a flat shape to a tip.

For this reason, only a pressure in the lateral direction is applied to the vertical surface of the vane, and it is possible to minimize the generation of a force for pushing up the vane.

According to a second aspect of the present invention, there is provided the rotary compressor according to the first aspect, wherein a tip of the vane on the low pressure side is a curved surface.

For this reason, only a pressure in the lateral direction is applied to the vertical surface of the vane, it is possible to minimize the generation of a force for pushing up the vane, and to reduce the contact area between the vane and the roller. it can.

[0010]

DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below with reference to the drawings.

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 a vane portion, and FIG.
FIG. 4 is a plan view of a cylinder and a roller showing the gist of the present invention, and FIG.
Is a refrigeration circuit diagram using a two-cylinder rotary compressor having the present invention, and FIG. 5 is a Mollier diagram in a refrigeration circuit diagram using a two-cylinder rotary compressor having the present invention.

1 is a two-cylinder rotary compressor (rotary compressor) equipped with the present invention.
An electric element 3 provided at an upper portion in a closed container 2 made of metal such as iron, and a rotary compression element 5 provided below the electric element 3 and driven to rotate by a rotation shaft 4 of the electric element 3. It becomes.

The hermetically sealed container 2 has an oil reservoir at its lower part, and includes a container 2A for housing the electric element 3 and the rotary compression element 5, and a sealing lid 2B for sealing the container 2A. A terminal terminal (wiring is omitted) 6 for supplying electric power to the electric element 3 is attached to the sealing lid 2B.

The electric element 3 is composed of a rotor 7 and a stator 8, and the rotor 7 is provided with a permanent magnet (not shown) inside a laminated body 10 composed of laminated electromagnetic steel sheets. The windings 11 are attached to a laminated body 12 in which a plurality of electromagnetic steel sheets are laminated.
In addition, 9 is a balancer. Although this structure is referred to as a DC motor, a motor referred to as an AC motor in which an aluminum core made of aluminum is inserted into a laminated electromagnetic steel plate may be used.

Further, when used for an air conditioner of a car or the like, an engine of the car or the like may be used as a drive source, or another drive source may be used.

The rotary compression element 5 includes a plate middle (intermediate partition plate) 13, upper and lower cylinders 14 and 15 mounted above and below the plate middle 13, and a rotary shaft 4 inside the upper and lower cylinders 14 and 15. Vertical eccentric part 16, 1
Upper and lower rollers 18 and 19 which are rotated by 7; upper and lower vanes 20 and 21 which contact the upper and lower rollers 18 and 19 to partition the inside of the upper and lower cylinders 14 and 15 into a high-pressure chamber and a low-pressure chamber;
The main frame 2 that closes the upper and lower openings of the upper and lower cylinders 14 and 15 and allows the rotation of the rotary shaft 4.
2, and a bearing plate 23.

Further, these are arranged in the order of a main frame 22, an upper cylinder 14, a plate middle 13, a lower cylinder 15, and a bearing plate 23, and are connected by bolts 24.

The rotary shaft 4 is provided with an oil supply hole 25 for supplying lubricating oil, that is, oil, to each sliding portion of the rotary compression element 5. Further, the outer peripheral surface of the rotating shaft 4 communicates with the oil supply hole 25 so that the oil is supplied to the upper and lower rollers 1.
An oil supply groove 26 leading to the inside of each of 8 and 19 is formed. Further, the upper and lower vanes 20 and 21 are provided with the upper and lower rollers 1.
A spring 27 for constantly biasing the springs 8 and 19 is provided.

The oil used as the lubricating oil may be an existing oil such as a mineral oil (mineral oil), an alkylbenzene oil, an ether oil or an ester oil.

The upper and lower cylinders 14 and 15 are provided with upper and lower introduction pipes (not shown) for introducing a refrigerant, and upper and lower outlet pipes 30 and 31 for discharging the refrigerant. Refrigerant pipes 32, 33, and 34 are connected to the upper and lower introduction pipes and the upper and lower outlet pipes 30, 31, respectively.

Reference numeral 35 denotes a pedestal for supporting the closed container 2, and reference numeral 36 denotes a suction muffler.

With the above structure, the upper and lower vanes 20,
As shown in FIG. 3, 21 is a vertical surface in which one end of the upper and lower vanes 20, 21 is formed in a flat shape up to the end,
The other had a curved surface (a cross section of 1/4 circle), the curved surface side was located on the low pressure chamber 45 side, and the vertical surface side was located on the high pressure chamber 46 side.

Thus, the pressure in the high-pressure chamber 46 is applied in the lateral direction of the vanes 20 and 21, and it is possible to prevent the generation of a force for pushing up the vanes 20 and 21.

[0024] Therefore, vane jump can be prevented as much as possible, and the sealing performance between the high-pressure chamber 46 and the low-pressure chamber 45 is improved, so that the compression efficiency can be improved.

Next, the refrigerant circuit of the rotary compressor 1 will be described with reference to FIGS.

In the case of this two-cylinder rotary compressor 1,
A lower outlet pipe 31 provided in the lower cylinder 15 of the rotary compressor 1 and a condenser 37 are connected via a discharge side refrigerant pipe 32, and the condenser 37 and the cooler (evaporator) 3
8 is connected to the refrigerant pipe 40 via an expansion valve 39. The cooler 38 and the upper introduction pipe of the upper cylinder 14 of the rotary compressor 1 are connected by a suction-side refrigerant pipe 33.

Further, a refrigerant pipe 40 connecting the condenser 37 and the expansion valve 39 is provided with a bypass pipe 43 connected to a subcooler 42 via a bypass expansion valve 41.

The supercooler refrigerant pipe 44 from the subcooler 42 is connected to an upper outlet pipe 30 provided in the upper cylinder 14 of the rotary compressor 1 and a lower inlet pipe 29 of the lower cylinder 15.
And a connection refrigerant pipe 34 for connecting the inside and the inside of the suction muffler 36.

Incidentally, the subcooler 42 is constituted by a double pipe, in which the refrigerant from the bypass pipe 43 flows inside, and the refrigerant in the refrigerant pipe 40 flows outside. Conversely, the inside may be the refrigerant pipe 40 and the outside may be the bypass pipe 43.

Further, a structure provided in contact with heat conduction may be used.

The refrigerant pipe 40 branched from the bypass pipe 43 is introduced into the subcooler 42, where the refrigerant pipe 40 is in heat conduction with the bypass pipe 43 after the bypass expansion valve 41. It is provided. Thereafter, it is connected to the expansion valve 39 described above.

Accordingly, the gas refrigerant of carbon dioxide, which has been compressed by the two-cylinder rotary compressor 1 and has become high temperature, is cooled by the condenser 37, and is further cooled by the subcooler 42 to the heat of the bypass pipe 43. After the replacement, that is, the heat is released, the expansion valve 39 expands. Thereafter, the gas refrigerant flowing into the cooler 38 and radiating heat here returns to the rotary compressor 1 again from the suction side refrigerant pipe 33.

A part of the refrigerant condensed in the condenser 37 is diverted to a bypass pipe 43 and is adiabatically expanded by a bypass expansion valve 41.
From the heat. The refrigerant collected in the supercooler 42 is mixed with the high-temperature, high-pressure refrigerant in the upper cylinder 14,
The high-temperature, high-pressure refrigerant is cooled and flows into the lower cylinder 15. In addition, the refrigerant after collecting heat in the supercooler 42 is:
The high temperature after the discharge of the upper cylinder 14 is lower than the high pressure refrigerant.

Here, the critical pressure shown in FIG. 5 is about 72 to 73 kgf / cm ² G in the case of carbon dioxide refrigerant,
Above this critical pressure, that is, in the supercritical region, the carbon dioxide refrigerant is gasified.

In FIG. 5, point A is the refrigerant discharged from the supercooler 42 and the compressor 14 from the upper cylinder 14 and is sucked into the lower cylinder 15. Point B is the refrigerant discharged from the lower cylinder 15. is there.

Then, the refrigerant at point C is condensed in the condenser 37 and then agitated, and is adiabatically expanded by the bypass expansion valve 41. The point D is adiabatically expanded and pressure-reduced refrigerant that has radiated heat, flows into the supercooler 42, and cools the refrigerant at the point C to the point E.

The supercooled refrigerant at the point E is adiabatically expanded by the expansion valve 39 to be at the point F. Thereafter, as indicated by point G, the refrigerant that has collected heat in the cooler 38 and has become high temperature flows into the upper cylinder 14.

As shown at point H, the refrigerant which has been compressed by the upper cylinder 14 and has become high temperature and high pressure
2, the pressure decreases, the refrigerant is used for supercooling, and merges with the refrigerant whose temperature has risen (however, as described above, the high temperature after discharge of the upper cylinder 14 and the lower temperature than the high-pressure refrigerant). The cooled refrigerant flows into the rotary compressor 1.

The inside of the closed container 2 is at a low pressure similar to the suction pressure of the refrigerant, or at an intermediate pressure between the suction pressure and the discharge pressure of the refrigerant (for example, in the case of a two-stage compressor, the suction pressure of the second stage). ) Is desirable in terms of the pressure resistance of the sealed container 2.

The rotary compressor 1 described in detail above includes a home air conditioner, a commercial air conditioner (package air conditioner), an automobile air conditioner, a home refrigerator, a commercial refrigerator, a commercial freezer, a commercial refrigerator, Case,
It is used for vending machines, water heaters and the like.

Furthermore, the rotary compressor 1 has a size of 15 frames and an output of 1 horsepower.

[0042]

As described in detail above, according to the present invention, only lateral pressure is applied to the vertical surface of the vane, and it is possible to minimize the generation of a force for pushing up the vane.

For this reason, vane jump can be prevented as much as possible, and the sealing performance between the high pressure side and the low pressure side is improved, so that the compression efficiency can be improved.

Further, according to the second aspect of the present invention, the contact area between the tip of the vane and the roller can be reduced, and a good rotary compressor can be provided.

[Brief description of the drawings]

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 a vane portion.

FIG. 3 is a plan view of a cylinder and a roller showing the gist of the present invention.

FIG. 4 is a refrigeration circuit diagram using a two-cylinder rotary compressor equipped with the present invention.

FIG. 5 is a Mollier diagram in a refrigeration circuit diagram using a two-cylinder rotary compressor equipped with the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 2-cylinder rotary compressor 2 Hermetic container 3 Electric element 5 Rotary compression element 14 Upper cylinder 15 Lower cylinder 18 Upper roller 19 Lower roller 20 Upper vane 21 Lower vane 22 Main frame 23 Bearing plate 45 Low pressure chamber 46 High pressure chamber

 ────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Masaya Tadano 2-5-5 Keihanhondori, Moriguchi-shi, Osaka Sanyo Electric Co., Ltd. F-term (reference) 3H029 AA04 AA09 AA13 AB03 BB16 BB43 CC02

Claims (2)

[Claims] A cylinder closed at both ends, a roller rotating in the cylinder, and a vane partitioning between the high-pressure side and the low-pressure side while forming a compression space in the cylinder by contacting the roller. A rotary compressor that stores a rotary compression element consisting of: in a closed container, compresses the sucked refrigerant by the rotary compression element, and discharges the compressed refrigerant. A rotary compressor formed in a planar shape. 2. The rotary compressor according to claim 1, wherein a tip of the vane on a low pressure side is a curved surface.