JPH0543273Y2 - - Google Patents

Description

[Detailed description of the invention] (a) Industrial application field This invention relates to an improvement of a multi-type refrigerator that enables oil control and oil level management.

(b) Conventional technology Conventional multi-type refrigerators, for example,
It is configured as shown in Publication No. 105777. Here, a conventional example will be explained with reference to this publication. In FIG. 6, a suction pipe 53 of a compressor 52 is branched and connected to a suction pipe 51 of a compressor 50. The discharge sides of these compressors are connected via check valves 54 and 55, respectively, to the inlet side of a condenser 56 that liquefies the refrigerant. The outlet side of this condenser is connected via a thermostatic expansion valve 57 to the inlet side of an evaporator 58 that vaporizes the refrigerant. A temperature-sensitive cylinder of the temperature-type expansion valve 57 is provided at the outlet pipe of the evaporator 58. Also. The outlet pipe of the evaporator 58 is connected to the inlet side of an accumulator 59 for removing droplets from the refrigerant gas, and the suction pipe 51 of the compressor 50 is further connected to the outlet side of this accumulator.

The shell of the compressor 50 and the shell of the compressor 52 are connected to each other by an oil equalizing pipe 60 in order to equalize the amount of internal oil.

In a multi-type refrigerator with this structure, when the refrigerator is stopped, the oil is returned from the side with a larger amount of oil inside the shell to the side with a smaller amount of oil using an oil equalizing pipe 60, so that the oil is evenly accumulated when starting up.

(c) Problems to be solved by the invention However, since the oil equalizing pipe 60 is directly attached to the mounting hole of a side glass provided to monitor the oil level, it is not possible to install this side glass in the middle of the oil equalizing pipe 60. or had to provide another side glass mounting hole in the shell. and,
When the oil level equalizing pipe 60 is installed in the middle, if the oil level of one of the compressors drops during operation, the oil level becomes filled only with gas and the oil position cannot be seen.
Furthermore, when a separate side glass mounting hole is provided in the shell, compatibility with a single unit compressor becomes difficult to achieve.

In order to solve the above-mentioned problems, this idea was developed by sandwiching a spacer attached to an oil equalizing pipe between side glasses, and attaching a side glass to the attachment part of this oil equalizing pipe so that oil control and oil level management can be performed at the same time. The purpose is to

(d) Means for solving the problem This device has a closed container that houses a compression element inside and stores oil at the bottom, and a side glass that is attached to a hole made in the wall of this container. In a multi-type refrigerator that is equipped with a compressor, a plurality of these compressors are installed in parallel, and an oil equalizing pipe that connects an internal oil reservoir between these compressors, a ring-shaped part is installed at the end of the oil equalizing pipe. A spacer is provided, and this spacer is sandwiched between the vessel wall and the side glass.

(e) Effect This device is constructed as described above, so that
A side glass is attached to the connection part of the oil equalizing pipe so that the oil level of the compressor can be directly seen even when gas flows through the oil equalizing pipe.

(F) Embodiment This invention will be explained below based on the embodiment shown in FIGS. 1 to 5.

Reference numeral 1 denotes a unit in which two compressors 2 and 3 are connected in parallel, and this unit has a condenser 4, a pressure reducing device 5, and an evaporator 6 connected through piping to form a refrigeration cycle. The compressors 2 and 3 are equipped with closed containers 7 and 8 that house a compression element (not shown) inside and store oil at the bottom. 9 and 10 are airtight containers 7 and 8
This hole is provided with side glasses 11 and 12 for monitoring the oil level. 13
is an oil equalizing pipe that equalizes the oil in the compressors 2 and 3, and this oil equalizing pipe is connected horizontally to the compressors 2 and 3. 14 and 15 are spacers attached to both ends of the oil equalizing pipe 13, and these spacers are formed in a ring shape. Spacers 14 and 15 are holes 9 and 10
It is attached so that it is sandwiched between side glasses 11 and 12. Holes 16 and 17 are provided in the spacers 14 and 15 to connect the oil equalizing pipe 13, and the holes are formed to have a size within a range that controls the oil level. In addition, the oil equalizing pipe 13 is simply adjusted to the size of the holes 16 and 17 so that the gas space and the oil space in the closed containers 7 and 8 can communicate with each other at the same time.

In the multi-type refrigerator configured in this way, the refrigerant compressed by the compressors 2 and 3 is transferred to the condenser 4.
It is discharged into the air and liquefied in this condenser. This liquefied refrigerant is depressurized by a pressure reducing device 5 and vaporized by an evaporator 6 to perform a cooling action. This vaporized refrigerant then returns to the compressors 2 and 3. that time,
The oil discharged from the compressors 2 and 3 together with the refrigerant is also returned. In addition, the oil in the closed containers 7 and 8 differs in the discharge amount and return amount depending on the operating conditions and installation conditions, and the oil level is not even. The oil inside is returned to the closed container 8 where the oil level is low to equalize the oil level. Furthermore, when a pressure difference occurs in the sealed containers 7 and 8, the oil with higher pressure tends to flow to the one with lower pressure, but the oil equalizing pipe 13 communicating with the gas space
High pressure gas flows toward the lower pressure side in the upper part of the container, equalizing the pressure in the closed containers 7 and 8, and preventing the oil from shifting due to the pressure difference. Further, the oil in the sealed containers 7 and 8 can be confirmed through side glasses 11 and 12. Moreover, this side glass is located at the connection part of the oil equalizing pipe 13, so that the state of the oil flowing through this oil equalizing pipe can be directly confirmed.

By allowing the oil equalizing pipe 13 to be drawn out laterally via spacers 14 and 15, installation space is not wasted when the two compressors 2 and 3 are oriented in the same direction.

In this invention, the oil equalizing pipe 13 is attached to the attachment portions of the side glasses 11 and 12 by spacers 14 and 15, so that oil control and oil level management can be performed at the same time.

(G) Effect of the invention As described above, according to this invention, a ring-shaped spacer is provided at the end of the oil equalizing pipe, and this spacer is sandwiched between the vessel wall and the side glass. The oil pipe can be attached to the compressor without any special processing, so that oil control and oil level management can be performed at the same time. Moreover, since this idea does not attach the oil equalizing pipe to a dedicated mounting part,
A compressor for a single unit can be used as a multi-type refrigerator.

[Brief explanation of the drawing]

Figures 1 to 5 show this invention, Figure 1 is a refrigeration cycle diagram, Figure 2 is a cutaway plan view of the main part showing the state in which the compressor is connected with an oil equalizing pipe, Figure 3 is also a front view, FIG. 4 is a sectional view of the spacer, FIG. 5 is a side view of the spacer, and FIG. 6 is a refrigeration cycle diagram showing a conventional example. 2, 3... Compressor, 4... Condenser, 6... Evaporator, 7, 8... Sealed container, 9, 10... Hole, 1
1, 12... Side glass, 13... Oil equalizing pipe, 1
4,15...Spacer.

Claims (1)

[Scope of utility model registration request] A compressor is provided, which has a compression element stored inside, a closed container with oil stored at the bottom, and a side glass attached to a hole in the wall of this container, and a plurality of these compressors are installed in parallel. In addition, in a multi-type refrigerator in which an oil equalizing pipe is provided between these compressors to connect an internal oil reservoir, a ring-shaped spacer is provided at the end of the oil equalizing pipe, and this spacer is connected to the container wall and side. A multi-type refrigerator characterized by being sandwiched between a glass and a glass.