JPH08326672A - Rotary compressor - Google Patents

Abstract

PURPOSE: To provide a rotary compressor capable of reducing generation of oil sludge. CONSTITUTION: A rotor 18 is mounted on the tip of a vane 17 in the case of a rotary compressor 1 in which the tip 17b of the vane 17 makes contact with the peripheral surface of a roller 13 turning inside of a cylinder 11. Since the constitution of this rotor 18 has been so designed as making rolling contact with the peripheral surface of the roller, generation of frictional force between the roller 13 and the vane 17 can be reduced so that any oil sludge generated under high temperature can be reduced.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rotary compressor having a vane tip in contact with the peripheral surface of a roller rotating in a cylinder.

[0002]

2. Description of the Related Art As a rotary compressor of this type,
For example, JP-B-49-3534 and JP-B-53-45843 are known. These known rotary compressors deal with changes in the amount of refrigerant (gas) transported by forming a notch in a part of the tip of the vane that comes into contact with the peripheral surface of the roller, or when starting again when restarting after stopping. It is configured to reduce the torque.

[0003]

On the other hand, in a rotary compressor, it is generally known that oil sludge increases when the temperature rises. In particular, the tip of the vane, which is always in contact with the peripheral surface of the roller, is liable to have the highest temperature due to frictional heat, which easily causes the generation of oil sludge.

Particularly, as refrigerating machine oil used for HFC type refrigerants, mineral oils and alkylbenzene type oils which are incompatible with HFC type refrigerants, ester type lubricating oils and ethers which are compatible with HFC type refrigerants. There are system lubricating oils, mixed oils thereof (hereinafter referred to as ester lubricating oils), and the like. But,
When ester-based lubricating oil is used, when water is present in the refrigeration circuit, it is hydrolyzed to generate an acid, and the generated acid forms sludge such as metal soap. Since such sludge is insoluble in the refrigerant and refrigerating machine oil, there is a problem that it accumulates in the refrigeration circuit, blocks the capillary tube, and clogs other pipes and refrigerant passages, causing a decrease in cooling capacity. is there.

Therefore, an object of the present invention is to provide a rotary compressor which can reduce the generation of oil sludge.

[0006]

In order to achieve the above object, the invention as set forth in claim 1 is directed to a roller rotating in the cylinder and a low pressure chamber in the cylinder whose tip contacts the peripheral surface of the roller. In a rotary compressor having a vane forming a high pressure chamber, a rotating body is provided at the tip of the vane, and the rotating body is brought into contact with the peripheral surface of the roller.

According to a second aspect of the present invention, in the first aspect of the present invention, the rotating body is a columnar body extending along the width direction of the roller, and the vane has a tip portion at the tip end portion thereof. An arc-shaped recess for mounting the columnar body is provided.

According to a third aspect of the invention, in the second aspect of the invention, a space for forming an oil film is interposed between the rotating body and the recess formed in the tip of the vane. It is characterized by being

[0009]

According to the first aspect of the present invention, the tip of the vane comes into contact with the peripheral surface of the roller to form a low pressure chamber and a high pressure chamber in the cylinder to perform gas compression. During this compression operation, the tip of the vane comes into contact with the peripheral surface of the roller, but the rotating body provided at the tip of the vane makes rolling contact with the peripheral surface of the roller, so that the friction heat between the roller and the vane is reduced. Occurrence can be reduced. Therefore, the oil sludge generated by the high temperature between the vane and the roller can be reduced.

According to the invention of claim 2, claim 1
The rotating body described in (1) is a columnar body extending along the axial direction of the roller, and since this columnar body makes rolling contact with the roller, the contact resistance is small and the generation of frictional heat can be reduced. Further, since the arcuate concave portion for supporting the columnar body is provided at the tip of the vane, it is possible to easily and surely support the columnar body only by placing it in the concave portion.

According to the invention of claim 3, claim 2
In the invention described in (1), a space is formed between the concave portion and the cylindrical body, and an oil film is formed in this space, so frictional heat between the tip of the vane and the cylindrical body is reduced, and further, it is generated by high temperature. The amount of oil sludge that occurs can be reduced.

[0012]

Embodiments of the present invention will be described below with reference to the accompanying drawings.

As shown in FIG. 1, in a rotary compressor 1 according to this embodiment, a rotor 5 and an electric section 7 housed in a casing 3 are vertically mounted on a base 50. Further, the rotary compressor 1 of the present embodiment
Is used in a so-called refrigeration cycle in which a refrigerant is circulated in a circuit to compress the refrigerant.

In the present embodiment, a non-azeotropic mixed refrigerant composed of a high boiling point refrigerant and a low boiling point refrigerant is used as the refrigerant. As such a non-azeotropic mixed refrigerant, for example, R134 is used.
a is 52 Wt%, R125 is 25 Wt%, R32 is 23
A three-type mixed refrigerant mixed at Wt% is used. In general,
When such a mixed refrigerant is used as a refrigerant, compared with the case where a conventional single refrigerant (for example, R-22) is used,
Since the increase of oil sludge becomes a problem, reduction of oil sludge is particularly desired. This is because ester-based lubricating oil is generally used as the lubricating oil when the HFC-based mixed refrigerant is used. Therefore, when water is present in the refrigeration circuit, the ester-based lubricating oil is hydrolyzed by the water. This is because the acid is generated and the generated acid forms sludge such as metal soap.

FIG. 2 shows a cross section of a main portion arranged in the casing 3 in the rotary compressor 1, and in the cylinder 11, an eccentric shaft 15 directly connected to a motor shaft (not shown) is provided. The roller 13 is fitted in the.

A vane 17 is slidably provided in a groove formed in the radial direction of the cylinder 11. The rear end 17a of the vane 17 is constantly pressed by the spring 21.

The vane 17 has a cylindrical body 18 as a rotating body at its tip 176, and a recess 2 for supporting the cylindrical body 18.
It has 0 and. As described above, by providing the cylindrical body 18 at the tip of the vane 17, the rotating body makes rolling contact with the peripheral surface of the roller 13, so that the frictional resistance caused by the contact with the roller 13 is small and the generation of frictional heat is suppressed. To be done.

The cylindrical body 18 extends in the axial direction of the roller 13 and has the same width dimension as the roller 13. As shown in the cross section at the tip of the vane 17 in FIG. 3, it is preferable that the radius r of the cylindrical body 18 be formed to be equal to or less than the thickness W of the vane 17, and by setting such a dimension, It can be held in the recess 20 of the vane 17 as it is.

Further, by making the recess of the recess 20 an arc having a radius R and making the radius R smaller than the radius r of the rotating body 18, or by displacing the center of the radius forming the arc, the recess 18 and the recess are formed. It is desirable to form a space 22 for holding the lubricating oil with respect to 20. That is, the recess 2
Friction heat can be further reduced by interposing a lubricating oil in the space 22 between 0 and the cylindrical body 18.

In the cylinder 11, the tip 1 of the vane 17
7b contacts the peripheral surface of the roller 13 via the rotating body 18,
A high pressure chamber 19b and a low pressure chamber 19a are formed.

A gas suction port 25 is formed on the low pressure chamber 19a side, and the gas is sucked into the cylinder 11 from here by the rotation of the roller 13. On the other hand, the high pressure chamber 19b
A gas outlet 25 is formed on the side of the roller 1
By the rotation of 3, the compressed gas is discharged from here.

Next, the operation of this embodiment will be described.

As shown in FIG. 2, the eccentric shaft 15 has an arrow S.
As shown, the roller 13 swings while rotating in the cylinder, sucks gas from the suction port 25, and discharges the gas.
The compressed high pressure gas is discharged from.

On the other hand, the vane 17 moves up and down in accordance with the movement of the roller 13, and the high pressure chamber 19b and the low pressure chamber 19a.
The high pressure chamber 19b is in a high temperature and high pressure state due to the adiabatic compressed gas.

That is, the tip of the vane 17 comes into contact with the peripheral surface of the roller 13 so that the low pressure chamber 19a and the high pressure chamber 1 are provided in the cylinder 11.
9b is formed and gas compression is performed. During this compression operation, the tip of the vane comes into contact with the peripheral surface of the roller 13 via the cylindrical body 18, which is a rotating body. In this case, the roller 13
Since the cylindrical body 18 makes rolling contact with the roller 13,
The generation of frictional heat between the vane 17 and the vane 17 can be minimized, and the oil sludge generated by high temperature can be reduced.

Further, since the lubricating oil is interposed and the film is formed in the space 22 between the concave portion 20 and the cylindrical body 18,
Lubrication of the cylinder 18 with respect to the vane 17 is promoted, and the cylinder 18 and the recess 20 do not come into direct contact with each other, so that the frictional resistance between them can be reduced.

As described above, in this embodiment, the rotary body 18 is provided at the tip of the vane 17, so that the frictional heat generated at the tip of the vane is reduced and the portion becomes high in temperature. The amount of oil sludge that occurs can be reduced.

The present invention is not limited to the above-mentioned embodiments, but can be variously modified without departing from the gist of the present invention.

For example, as shown in FIG. 5, the radius r of the cylindrical body 18 may be smaller than the arc radius R of the recess.

Further, as shown in FIG. 6, as shown in FIG. 3, a through hole 26 is formed in the recess 20 to connect the space 22 for forming the oil film to the high pressure chamber side. The cylinder 18 may be supported by balancing the oil pressure of the oil film with the high pressure chamber side.

Furthermore, a columnar body is attached to the tip of the vane 17.
The arrangement is not limited to the individual arrangement, and a plurality of cylindrical bodies having a small radius r may be arranged, or a plurality of spherical spherical bodies may be arranged side by side as the rotating bodies.

[0032]

According to the invention described in claim 1, since the rotating body is provided at the tip of the vane and the rotating body makes rolling contact with the peripheral surface of the roller, friction between the roller and the vane is provided. Since the heat generation is reduced and the high temperature at the tip of the vane is suppressed, the oil sludge generated due to the high temperature can be reduced.

According to the invention of claim 2, claim 1
The rotating body provided at the tip of the vane described above is a columnar body extending along the axial direction of the roller, and the tip of the vane is configured to form an arcuate recess for supporting the columnar body. The rotating body can be easily and surely supported by the vane.

According to the invention of claim 3, claim 2
In the invention described in (1), since the space for holding the oil film is formed between the recess and the cylinder, the friction heat between the recess at the tip of the vane and the cylinder is further reduced, and the oil generated by the high temperature is generated. Sludge can be further reduced.

[Brief description of drawings]

FIG. 1 is a front view showing the outer appearance of a rotary compressor according to an embodiment of the present invention.

FIG. 2 is a cross-sectional view schematically showing the configuration inside the rotary compressor shown in FIG.

FIG. 3 is a cross-sectional view showing a tip portion of the vane shown in FIG.

FIG. 4 is a perspective view showing a tip portion of the vane shown in FIG.

FIG. 5 is a cross-sectional view showing a tip portion of a vane according to a modified example of this embodiment.

FIG. 6 is a cross-sectional view showing a tip portion of a vane according to another modification of this embodiment.

[Explanation of symbols]

 1 rotary compressor 13 roller 17 vane 18 rotating body 20 recess 22 space

Claims (3)

[Claims] 1. A rotary compressor having a roller rotating in a cylinder and a vane whose tip contacts a peripheral surface of the roller to form a low pressure chamber and a high pressure chamber in the cylinder. A rotary compressor provided with a rotating body, and the rotating body is brought into contact with the peripheral surface of the roller. 2. The rotating body is a columnar body extending along the width direction of the roller, and an arc-shaped recess for mounting the columnar body is provided at a tip portion of the vane. The rotary compressor according to claim 1, wherein: 3. The rotary compressor according to claim 2, wherein a space for forming an oil film is interposed between the rotating body and the recess formed in the tip of the vane.