JPH0610865A - Liquid refrigerant conveyer - Google Patents

Abstract

PURPOSE:To improve durability of a liquid refrigerant conveyer by providing a shaft of constituting a displacement type compressing machine part, bearing for supporting the shaft and a ball bearing stored in this shaft supporting bearing to support the shaft and sealed with grease of containing MoS2. CONSTITUTION:A shaft 20 is rotated by a motor constituted of a stator 3 and a rotor 4, to eccentrically rotate a roller 6 according to this rotation of the shaft 20, and a liquid refrigerant, guided into a cylinder from a heat conveying cycle by passing through a pipe All, is compressed and released into a case 2 through a port 10. The liquid refrigerant released into the case 2, passing through a pipe B12, is fed out to the heat conveying cycle. The shaft 20, main bearing 21 and a subbearing 22 perform rolling rotation by ball bearings 23, 24. A seal material 23e of chloroprene rubber is provided in the ball bearing 23, and a chamber, formed by an outer ring 23a, inner ring 23d and the seal material 23e of chloroprene rubber, is sealed with grease 23f contained with MoS2.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a liquid-refrigerant transporting device used for a cooling and heating device or the like.

[0002]

2. Description of the Related Art Water is generally used as a heat carrier for a heat transfer cycle, but in recent years, it has a high chemical stability and can be maintained maintenance-free by completely sealing the cycle. Since a large amount of heat can be transferred by utilizing the latent heat of vaporization between the gas phase and the liquid phase for gas-liquid mixing, a heat transfer cycle using a liquid refrigerant as a heat medium has been considered.

Attempts have been made to use a hermetic compressor as a liquid refrigerant carrier device for this cycle.

An example of a conventional liquid refrigerant transfer device (hereinafter referred to as a transfer device) will be described below with reference to the drawings.

FIG. 4 shows a cross-sectional view of the carrying device, and FIG. 5 shows a cross-sectional view of a mechanical portion of the carrying device. In FIG. 4, reference numeral 1 is a positive displacement compression machine. Reference numeral 2 is a case, 3 is a stator shrink-fitted to the case 2, 4 is a rotor that constitutes a motor with the stator 3, and 5 is a shaft shrink-fitted to the rotor 4. Further, 6 is a roller incorporated in the eccentric portion of the shaft 5, 7 is a cylinder for housing the roller 6, and 8 is the shaft 5.
Main bearing, 9 is a secondary bearing of the shaft 5, 10 is a cylinder 7
It is a port that communicates from the inside to the inside of the case 2. Also, 11
Is a pipe that directly communicates with the inside of the cylinder 7 from the outside, 12 is a pipe that communicates with the outside and the inside of the case, and the pipe 11 and the pipe 12 are welded and sealed to the case 2.

FIG. 5 is a sectional view taken along the line BB in FIG. 4, in which the vane 13 is housed in the groove of the cylinder 7 and the tip of the vane 13 is in sliding contact with the roller 6. Next, the operation will be described.

The shaft 5 is rotated by a motor composed of the stator 3 and the rotor 4, and the roller 6 is eccentrically rotated accordingly, and the liquid refrigerant introduced into the cylinder 7 from the heat transfer cycle through the pipe 11 is compressed. , And is discharged into the case 2 through the port 10. Then, the liquid refrigerant discharged into the case 2 is sent out to the heat transfer cycle through the pipe 12.

Further, since the motor composed of the stator 3 and the rotor 4 can rotate in the reverse direction, and the port 10 is not provided with a check valve mechanism, if the motor is rotated in the reverse direction, the liquid refrigerant flows in through the pipe 12. Compress in cylinder 7 and pipe 1
It can be sent out from 1. The case 2 is almost filled with the liquid refrigerant, and the liquid refrigerant is used for lubricating the mechanical parts and cooling the respective parts.

Here, as the liquid refrigerant, dichlorodifluoromethane, dichlorofluoromethane and 1,
It uses a highly heat-stable refrigerant used in refrigerators and air conditioners, such as 1,1,2 tetrafluoroethane, and the basic configuration and materials of the transfer device are those of the 200 kcal / h class refrigerator compressor. ing.

That is, when the heat medium is used as a refrigerant having a high chemical stability in a closed cycle, a complicated structure in which the driving part and the mechanical part have separate structures like a chemical magnet pump having excellent corrosion resistance and solvent resistance. There is no need to use a structure, and it is not necessary to form all parts with expensive materials such as polytetrafluoroethylene having excellent chemical resistance and various ceramics.

Therefore, the above-mentioned transfer device uses the basic structure of the compressor for the refrigerator, and only changes the point that the motor can be rotated forward and backward and the point that the port is not provided with a valve mechanism. The iron-based material mainly composed of cast iron and the motor material are the same as the motor material for the refrigerator compressor.

[0012]

However, in the above structure, since the liquid refrigerant always flows in the case,
Since oil cannot be sufficiently retained in the case as a lubricant as used in a compressor for a refrigerator, wear of the mechanical part increases due to insufficient lubrication, resulting in insufficient long-term durability.

As an attempt to improve this point, it is possible to improve the lubricity of the liquid refrigerant. For example, Japanese Patent Publication 60-1
According to Japanese Patent Laid-Open No. 5664, when a large amount of a lubricity improving additive is added, the purity of the refrigerant is lowered and the heat transfer ability is lowered, so that a sufficient effect cannot be expected. In recent years, due to the problem of ozone layer depletion, a refrigerant containing chlorine, which has a large ozone depletion effect, cannot be used, and the lubricity of the refrigerant tends to be further reduced due to the loss of the extreme pressure of chlorine.

Therefore, there has been a demand for a transporting device which can suppress wear of the mechanical portion and maintain durability even under the condition of liquid refrigerant lubrication.

In view of the above-mentioned problems, the present invention is to improve the wear resistance of the material of the machine part and the durability of the liquid refrigerant carrier device.

[0016]

In order to solve the above-mentioned problems, a conveying apparatus of the present invention comprises a positive displacement compression machine section, a shaft forming the positive displacement compression machine section, and a bearing for supporting the shaft. A ball bearing housed in the bearing, supporting the shaft, and filled with grease containing MoS ₂ is provided.

Further, the ball bearing in which the grease containing MoS ₂ is sealed is provided with a seal member made of chloroprene rubber.

[0018]

According to the present invention, the liquid refrigerant is carried by the displacement type compression machine section by the above-mentioned construction, the shaft and the bearing having a high peripheral speed can be received by the rolling shaft, and the wear of the contact portion can be reduced, and the ball bearing balls can be reduced. The grease containing MoS ₂ is used to lubricate the ball bearings and wear of the ball bearings can be reduced. In addition, the ball bearing is sealed with chloroprene rubber to reduce the chemical attack of the liquid refrigerant on the sealing material and to improve the durability of the transfer device.

[0019]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A liquid refrigerant carrier device according to an embodiment of the present invention will be described below with reference to the drawings.

A rolling piston type rotary compressor is used as an example of the positive displacement compression machine section.

FIG. 1 is a cross-sectional view of the conveying device of the present invention, FIG. 2 is a cross-sectional view of the mechanical portion of FIG. 1, and FIG. 3 is an enlarged cross-sectional view of the main parts of the ball bearing and shaft of the present invention. The same components as those of the conventional one are designated by the same reference numerals and detailed description thereof will be omitted.

In FIGS. 1 and 2, 20 is a shaft, 2
Reference numeral 0a denotes an eccentric portion of the shaft, and reference numerals 21 and 22 denote main bearings and auxiliary bearings, which house ball bearings 23 and 24, respectively. The ball bearings 23 and 24 are press-fitted and fixed to the main shaft, and are loosely fitted to the main bearing 21 and the sub bearing 22.

In FIG. 3, reference numeral 23a is a foreign character of the ball bearing 23, 23b is a ball, and 23c is the ball 2.
3b is a retainer, 23d is an inner ring of the ball bearing, and 23e is a chloroprene rubber seal member that is fixed by its elasticity by abutting on the outer ring 23a and the inner ring 23d. 23f is the outer ring 23a, the inner ring 23
d, a grease containing MoS ₂ filled in the chamber formed by the sealing material 23e of chloroprene rubber.

The operation of the transporting device constructed as described above will be described below with reference to FIGS. 1, 2 and 3.

The shaft 5 is rotated by the motor constituted by the stator 3 and the rotor 4, and the roller 6 is eccentrically rotated accordingly, and the liquid refrigerant introduced into the cylinder 7 through the heat transfer cycle through the pipe A11 is compressed. , And is discharged into the case 2 through the port 10.

At this time, the reaction force due to the compression of the liquid refrigerant is transmitted to the shaft 20 via the roller 6, and the shaft 20 is pressed against the ball bearings 23 and 24 to rotate.

Then, the liquid refrigerant discharged into the case 2 is sent out to the heat transfer cycle through the pipe B12. Further, the motor can rotate in the reverse direction, and the liquid refrigerant can flow backward as in the conventional case.

Therefore, the shaft 20, the main bearing 21, and the sub bearing 22 are rotated by the ball bearings 23 and 24. Further, the ball bearing 23 is provided with a sealing material 23e of chloroprene rubber, and the outer ring 23
a, inner ring 23d, chloroprene rubber sealing material 23e
23f containing MoS ₂ in the chamber formed by
By enclosing, the life of the shaft is increased.

The ball bearing 23 is provided with a sealing material 23e of chloroprene rubber, and the sliding property is not deteriorated by the infiltration of the liquid refrigerant into the chamber formed by the outer ring 23a, the inner ring 23d and the sealing material 23e of the chloroprene rubber. It can be prevented by the grease 23f containing MoS ₂ . The ball bearing 24 can have a similar structure.

[0030]

As described above, the present invention comprises the positive displacement compression machine section, the shaft forming the positive displacement compression machine section, and the bearing supporting the shaft, and is housed in the bearing to support the shaft. Since the ball bearing in which the grease containing MoS ₂ is sealed is provided, the shaft and the bearing rotate, and a bearing with high speed and long life in the liquid refrigerant can be provided, and a stable transfer device can be provided.

Further, the inner ring and the outer ring, the sealing material of the chloroprene rubber contacting the inner ring and the outer ring, and the chamber formed by the sealing material of the inner ring and the outer ring and the chloroprene rubber are Mo.
By constructing a ball bearing filled with grease containing S ₂ , the ball of the ball bearing is MoS ₂
The grease containing the grease can further extend the service life, and the deterioration of the slidability due to the infiltration of the liquid refrigerant can be prevented by the grease containing the MoS ₂ so that the transport device having a long life can be realized.

[Brief description of drawings]

FIG. 1 is a sectional view of a liquid-refrigerant carrier according to an embodiment of the present invention.

2 is a cross-sectional view taken along the line AA of FIG.

FIG. 3 is an enlarged sectional view of a main part of a ball bearing and a shaft according to the present invention.

FIG. 4 is a sectional view of a conventional liquid refrigerant carrier device.

5 is a sectional view taken along line BB of FIG.

[Explanation of symbols]

1 Positive displacement compression machine part 20 Shaft 21 Bearing 23, 24 Ball bearing 23a Outer ring 23d Inner ring 23e Sealing material of chloroprene rubber 23f Grease containing MoS ₂

Claims (2)

[Claims] 1. A positive displacement compression machine section, a shaft that constitutes the positive displacement compression machine section, a bearing that supports the shaft, and a Mo that is housed in the bearing and supports the shaft.
And a ball bearing in which grease containing S ₂ is sealed. 2. The refrigerant transfer device according to claim 1, wherein the ball bearing in which the grease containing MoS ₂ is sealed has a sealing material of chloroprene rubber.