KR20130031369A - Refrigeration cycle apparatus - Google Patents

Abstract

A suction pipe having a T-shaped branch pipe for dividing the refrigerant from the accumulator on the suction port side of the plurality of compressors is provided, and the suction pipe is provided with a strainer upstream of the T-shaped branch pipe. This configuration makes it possible to provide a refrigeration cycle apparatus that can reduce the ubiquity of the amount of oil in the refrigerator oil returned to the plurality of compressors.

Description

REFRIGERATION CYCLE APPARATUS

The present invention relates to a refrigeration cycle apparatus.

In general, a refrigeration cycle device such as an air conditioner is provided with an accumulator for separating gaseous liquid from a refrigerant in a suction pipe through which a refrigerant circulating the refrigeration cycle is sucked into the compressor, whereby the liquid refrigerant is returned to the compressor. The liquid back is prevented.

In a conventional air conditioner including a plurality of compressors, a branched branch pipe in which a refrigerant from an accumulator is separated into a plurality of compressors is interposed in the middle of a suction pipe.

However, in such a conventional header type branch pipe, a new problem that refrigeration oil mixed with a refrigerant and sucked into a plurality of compressors, respectively, is concentrated in a specific compressor, and thus there is a shortage of refrigeration oil returned to another compressor.

That is, in the conventional header type branch pipe, branch pipes connected to the suction side of the compressor are sequentially connected from the upstream side closest to the accumulator toward the downstream side.

For this reason, the oil residue of the refrigeration oil which is heavier than the gaseous phase powder in the refrigerant is likely to be concentrated in the compressor connected to the branch pipe away from the accumulator due to inertia, and the unevenness of the refrigeration oil occurs that the refrigeration oil is insufficient. In addition, since the refrigeration oil is diluted with the refrigerant, the lubricity of the sliding parts of the compressor is lowered, which may cause a failure.

This invention is made | formed in view of such a situation, and the objective is to provide the refrigeration cycle apparatus which can reduce the uneven distribution of the amount of oil of the refrigeration oil returned to several compressor.

According to a refrigeration cycle apparatus according to a preferred embodiment of the present invention provided for achieving the above object, there is provided a suction pipe having a flow passage for classifying the refrigerant from the accumulator to the suction port side of the plurality of compressors, and in the suction pipe, A strainer is provided on an upstream side of a branching section of the flow splitter.

According to a preferred embodiment of the present invention, since the strainer is mounted in the middle of the suction pipe (the suction pipe main portion), foreign matter mixed in the refrigerant can be removed by the strainer.

For this reason, it is possible to reduce the deterioration of the compression capacity of the compressor and the occurrence of failure due to clogging caused by foreign matter in the refrigerant passage downstream from the strainer.

In addition, since the refrigeration oil can be supplied to the plurality of compressors almost evenly, the effect of reducing the operational problems of the compressors 8 to 10 due to the lack of the refrigeration oil can be achieved.

BRIEF DESCRIPTION OF THE DRAWINGS The principal part structure schematic of one Embodiment which concerns on the refrigeration cycle apparatus of this invention.
2 is a schematic view of a refrigeration cycle apparatus for explaining the operation of the refrigeration cycle according to the embodiment.

EMBODIMENT OF THE INVENTION Hereinafter, embodiment of this invention is described based on drawing. In addition, the same code | symbol is attached | subjected to the same or equivalent part among several drawings. In addition, this invention should not be interpreted limited to embodiment of the following description.

As shown in FIG. 2, the air conditioner 1 as the refrigeration cycle apparatus according to the present embodiment includes a plurality of (for example, four) indoor units 2, 3, 4, 5, and one large outdoor unit. The refrigeration cycle 7 which has (6) is provided. The refrigeration cycle 7 includes, for example, three compressors 8, 9 and 10 connected in parallel to each other, an oil separator 11 connected to the refrigerant discharge port side of these compressors 8 to 10, and these compressors ( Accumulator 12 connected to the refrigerant inlet side of 8 to 10, four-way valve 13, for example, two large outdoor heat exchangers 14 and 15 connected in parallel to each other, for example For example, two outdoor expansion valves 16 and 17 and a liquid tank 18, for example, four indoor heat exchangers 19, 20 and 21 connected in parallel to each other, are connected to the refrigerant pipe 23. It is comprised by the refrigeration cycle which connects one by one, and circulates a refrigerant | coolant.

As the refrigerant pipe 23, the discharge pipe 24 having the collecting pipe connected in parallel to the refrigerant discharge ports of the three compressors 8, 9 and 10, and the refrigerant discharged from the accumulator 12 are supplied to the three compressors 8 to 10. A pair of connecting pipes connecting the gas pipe side ends and the liquid pipe side ends of the suction pipe 25, the outdoor unit 6 and the refrigerant pipes 23 of the indoor units 2 to 5 to be described later, to be returned to the suction port side of (26a, 26b).

Each of the indoor units 2 to 5 is mainly an indoor heat exchanger 19, 20, 21, 22, an indoor fan 27, 28, 29, 30, or an interior within each indoor unit housing 2a, 3a, 4a, 5a. The expansion valves 31, 32, 33, 34, and the indoor control apparatus not shown are accommodated.

On the other hand, the outdoor unit 6 mainly includes a refrigerant pipe 23 and an oil separator 11 including a plurality of compressors 8 to 10, discharge pipes 24 and suction pipes 25 in the outdoor unit housing 6a. And a four-way valve 13, a plurality of outdoor heat exchangers 14 and 15, a plurality of outdoor expansion valves 16 and 17, a liquid tank 18 and an outdoor control device (not shown).

The outdoor control device is composed of, for example, a microprocessor, and is electrically connected to the compressors 8 to 10, the four-way valves 12, and the outdoor electromagnetic expansion valves 16 and 17 through signal lines (not shown). The driving of these (8 to 10, 12, 16, 17) is controlled, for example, the refrigeration cycle is operated to be capable of heating and cooling and variable capacity. Further, the outdoor control device is connected to an indoor control device (not shown) made of a microprocessor or the like via a signal line (not shown) so as to enable bidirectional data communication. It receives through and performs operation according to the operation command signal.

In addition, the outdoor control device drives the three compressors 8 to 10 by, for example, seven patterns in accordance with the operation command signal from the indoor control device. That is, it is a total of 7 patterns of three patterns which drive one of these compressors 8-10, respectively, one pattern which drive | moves all simultaneously simultaneously, and three patterns which drive simultaneously by combining suitably two. In addition, although the compression capacities of these compressors 8 to 10 are almost equal, they are configured to vary in capacity by an inverter.

And as shown in FIG. 1, the suction pipe 25 has the suction pipe main part 25a which mounts the strainer 36 in the middle. The strainer 36 is provided with a filter, such as a metal net, for removing the foreign material in a refrigerant | coolant. The suction pipe main pipe part 25a connects one end (right end part in FIG. 1) to the outlet end of the discharge pipe 12a of the accumulator 12. The accumulator 12 accommodates the inner end portions of the lead-out pipe 12a and the inlet pipe 12b in the main body 12c, and separates gaseous liquid of the refrigerant introduced into the main body 12c by the inlet pipe 12b. The refrigerant in the gaseous phase (gas) is returned to the intake port of the compressors 8 to 10 through the induction pipe 12a and the suction pipe 25, and the liquid bag return to the compressors 8 to 10 is reduced. Doing.

The lead pipe 12a is bent and formed in substantially U-shape, for example, and the oil hole 12d is formed in the U-shaped bottom part. The oil hole 12d separates the refrigerant oil mixed in the refrigerant introduced into the accumulator main body 12c at the time of gas-liquid separation of the refrigerant, and sucks the refrigerant oil stored on the inner bottom of the accumulator main body 12c. The lead pipe 12a is taken out together with the refrigerant in the gas phase.

The suction pipe main pipe portion 25a has a diameter φ1 of the downstream end 25c downstream of the strainer 36 interposed therebetween, and a diameter smaller than the diameter φ2 of the upstream end 25b. It is formed as (phi) <(phi) 2, and the lower end part in FIG. 1 of this downstream side edge part 25c is connected to the branch pipe main-pipe part 37a of the T-shaped branch pipe 37. As shown in FIG.

The T-shaped branch pipe 37 couples the left and right pair of branch pipe branch parts 37b and 37c in a substantially T-shape integrally with the branch pipe main part 37a to form a T-shaped refrigerant flow path. To form. On the other hand, these pair of branch pipe branch parts 37b, 37c connect the reference numeral "37c" to the inlet port of one compressor 8 via the small diameter branch pipe 38 in FIG. The branch pipe branch portion 37b is connected to the main pipe portion 40a of the Y joint 40 via a large diameter branch pipe 39.

The pipe diameter φ3 of the small diameter branch pipe 38 is set to a diameter corresponding to the compression capacity of one of the compressors 8 to 10, and the large diameter branch pipe 39 is formed of the compressors 8 to 10. It is formed in the diameter according to the compression capacity of two units. Therefore, as for the large diameter branch pipe 39, the pipe diameter (phi) 4 is nearly (2) times larger than the pipe diameter (phi) 3 of the small diameter branch pipe 38. As shown in FIG.

The Y joint 40 integrally couples a pair of bifurcated branch pipes 40b and 40c to the main pipe portion 40a to form a Y-shaped refrigerant passage. The suction ports of the compressors 9 and 10 are connected to these branch pipes 40b and 40c.

Therefore, according to this embodiment, since the strainer 36 is mounted in the middle of the suction pipe 25 (suction pipe main part 25a), the foreign material mixed in the refrigerant can be removed by the strainer 36.

For this reason, it is possible to reduce the decrease in the compression capacity of the compressors 8 to 10 and the occurrence of failure due to clogging caused by foreign matter in the coolant flow path downstream from the strainer 36.

In addition, at the suction pipe upstream end portion 25b on the upstream side of the strainer 36, the refrigerant inside thereof mixes the refrigeration oil sucked from the oil hole 12d of the accumulator 12, thereby causing a gas-liquid abnormal flow ( Although flowing in a two-phase flow, the flow is a drift in which the liquid refrigerant is ubiquitous.

However, when the refrigerant into which the refrigerant oil is mixed flows into the strainer 36, it collides with a filter such as a metal network, and turbulence occurs, so that the refrigerant oil in the refrigerant is dispersed, thereby alleviating the drift. For this reason, since refrigeration oil can be supplied to the some compressor 8-10 substantially evenly, the operation | movement problem of the compressors 8-10 by a lack of refrigeration oil can be reduced.

The intake pipe 25 is formed such that the diameter 1 of the downstream end 25c downstream of the strainer 36 is smaller than the diameter 2 of the upstream end 25b by a smaller diameter? The flow rate of the refrigerant flow at the downstream side 25c can be increased correspondingly. For this reason, the pressure loss at the time of refrigerant | coolant flowing in the strainer 36 can be aimed at.

In addition, in the T-shaped branch pipe 37, the refrigerant flowing from the main pipe part 37a is connected to a linear flow path that linearly connects the pair of left and right branch pipe branches 37b and 37c in FIG. Since it collides almost vertically, turbulence also occurs here. For this reason, since the drift of the refrigeration oil in the refrigerant is further dispersed by this turbulence, it is possible to further promote the equalization.

In addition, the pipe diameter φ3 of the small diameter branch pipe 38 connected to the suction port of one compressor 8 is smaller than the pipe diameter φ4 of the large diameter branch pipe 39, which is almost 1 / √2, and 1 Since it is set to the diameter according to the compression capacity of most of the compressors 8, the refrigerant | coolant flow volume suitable for the compression capacity of the one of the compressors 8 can be introduce | transduced.

In addition, since the large diameter branch pipe 39 sets the diameter φ4 to a diameter corresponding to the compression capacity of the two compressors 9 and 10, the compressor 9 and 10 have a compression capacity. According to the appropriate refrigerant flow rate can be classified.

In addition, the pipe diameters φ5 and φ6 of the branch pipes 41 and 42 on the downstream side of the Y joint 40 are also set to the diameters corresponding to the compression capacity of each of the compressors 9 and 10.

 In this embodiment, even when three compressors 8 to 10 are operated or excessive liquid return from the accumulator 12 occurs, the deflection of the return of the liquid refrigerant is reduced and all the compressors 8 to 10 are reduced. By returning the refrigeration oil evenly to), the failure of the compressors 8 to 10 can be prevented and reliability can be ensured. In addition, the compressors 8 to 10 can equalize excessive recovery of the liquid refrigerant and the refrigeration oil even in all the number of driving units even when the number of operating units of the compressors 8 to 10 changes depending on the state of the air conditioning load by the inverter.

In addition, although the Y joint 40 is connected to the large-diameter branch pipe 39, the Y joint 40 is smaller and lighter than the T-shaped branch pipe 37 and the header type branch pipe, so that the outdoor unit 6 Small size and light weight can be aimed at.

While certain embodiments have been described, these embodiments have been presented by way of example only, and are not intended to limit the scope of the inventions. These novel embodiments can be implemented in various other forms, and various omissions, substitutions, and changes can be made without departing from the spirit of the invention. These embodiments and modifications thereof are included in the scope and spirit of the invention, and are included in the inventions described in the claims and their equivalents.

1: air conditioner
2, 3, 4, 5: indoor unit
6: outdoor unit
7: refrigeration cycle
8, 9, 10: compressor
25: suction line
36: strainer
37: T branch pipe
37a: branch pipe supervision
38: small diameter branch piping
39: Large diameter branch piping
40: Y joint

Claims (5)

A refrigeration cycle apparatus having a suction pipe having a flow passage for dividing refrigerant from an accumulator into suction ports of a plurality of compressors, respectively,
The said suction pipe was equipped with the strainer interposed upstream rather than the branch part to the said flow path, The refrigeration cycle apparatus characterized by the above-mentioned. The method of claim 1,
The suction pipe,
A suction pipe main part for interposing the strainer;
And a T-shaped branch pipe having a branch pipe main part connected to the suction pipe main part and a branch pipe branch part branched from the branch pipe main part to form a flow path of the suction pipe and connected to suction ports of the plurality of compressors. Refrigeration cycle device, characterized in that. The method of claim 2,
The said suction pipe main-pipe part forms the pipe diameter downstream of the said strainer rather than the diameter of the upstream side, The refrigeration cycle apparatus characterized by the above-mentioned. The method of claim 2,
The pipe diameter of each branch pipe connected to each branch pipe branch of the said T-shaped branch pipe is set according to the number of compressors connected to these branch pipes, respectively. 5. The method of claim 4,
At least one of the branch pipes is connected to a suction port side of two compressors through a Y joint for dividing the flow path into two branches.

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