JPH0325252A - Refrigeration equipment - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a refrigeration system that is equipped with several compressors and whose capacity is controlled by starting/stopping them, controlling the number of rotations, etc.

[Conventional technology]

The refrigeration system is equipped with several OEE compressors, and the capacity is controlled by controlling the start/stop and rotation of these compressors. Conventional techniques for preventing the addition of oil due to oil leakage and dilution of lubricating oil due to liquid refrigerant are known, for example, from Utility Model Publication No. 62-8811
No. 63-46274, etc.

[Problem to be solved by the invention]

Conventional refrigeration equipment that includes multiple OLi compressors and performs capacity control through D start/stop and rotation speed control is described in the above-mentioned Jiko Kokan et al. However, these technologies
This content can be applied to a low pressure chamber type compressor, but cannot be applied to a high pressure chamber type compressor.

Conventional technology's Nuro
Fig. 8 shows the case in which it is used. Compressor 1 and compressor 2
are connected by suction pipes 8, 9.10 and discharge pipes 11, 12.18, and an oil equalizer f80 is provided between the oil reservoirs of the high pressure chamber la and the compression high pressure chamber 2a. be.

In this case, when two compressors are operated, the internal pressures of the two D compressors will not be exactly the same due to manufacturing variations in the pressure J and f distribution, etc. Therefore, if the compressor engine O lubricating oil part #O, a lubrication occurs.

Also, the operation of the compressor 2 is stopped, and lf. When the compressor 1 is operated to control the capacity of the refrigeration I & When the problem is excited, the amount of oil coming up increases due to O Problems with lubricating oil may occur.

The purpose of the present invention is to solve this problem and provide a refrigeration system with a wider capacity G4 width. [Means for solving the problem] In order to achieve the above object, the present invention provides a common oil sump that collects lubricating oil of each compressor, and from each O compressor, the oil sump An oil return pipe for returning lubricating oil to the compressor is connected to the oil sump, and an oil supply pipe for supplying lubricating oil from the oil sump to each compressor is connected to the oil supply device of the compressor. In addition, each compressor is provided with a check valve to prevent high-pressure gas refrigerant from flowing into the suction pipe through the stopped compressor.

[Effect]

Due to the above-mentioned O44 configuration, when two If compressors are operated, lubricating oil passes through the oil supply pipe from the oil supply device to the oil supply device of the compressor, and is supplied to each O compressor by the oil supply device. The lubricating oil supplied to each pressure unit is separated from the high-pressure refrigerant gas inside the high-pressure tank of the compressor, or is discharged together with the high-pressure refrigerant gas from the compressor to a discharge pipe and circulated within the refrigeration cycle. The lubricating oil separated inside the compressor high pressure chamber is returned to the oil sump through an oil return pipe. Therefore, by storing lubricating oil in two compressors (same for two or more compressors) in a common oil sump rather than in each O, and supplying lubricating oil from the oil sump to each compressor, It is possible to prevent lubricating oil D from shifting between pressure fk IJ machines.

Next, when the compression furnace is in operation, the internal pressure of the high pressure chamber of the stopped pressure machine A is determined by the check valve installed in the suction piping, etc. , is maintained equal to the &lS pressure in the oil sump, and since the compressor oil supply system is linked with the compressor, the pressure #i when it is stopped
No lubricating oil is supplied to the machine; lubricating oil is supplied only to the operating compressor. Further, the check valve can prevent the ii6 pressure gas refrigerant from flowing into the suction pipe through the stopped pressure machine.

〔Example〕

The present invention will now be explained in detail with reference to FIGS. In the drawings, the same parts in the ml diagram to FIG. 2 are represented by the same reference numerals. There is no instruction in the explanation of the operation - make sure the solenoid valve is open. Figure 1~! The embodiment shown in Fig. 2 is a scroll compressor 1, 2 of a differential pressure oil supply system in which oil is supplied by a pressure difference at a high pressure.
, an oil sump 8.

In the embodiment shown in FIG. 1, high-pressure chamber type Q scroll compressors 1.2 are connected in parallel to a common D piping system, and a common oil catcher 8 for collecting lubricating oil of the compressors 1.2 is connected in parallel. establish.

From the compressor 1.2, the oil return pipes 4 and 5 that collect lubricating oil in the oil sump 8 are communicated with the nuclear oil sump, and the lubricating oil is further transferred from the oil sump 8 to the compressors 1 and 2. The oil supply pipe 6.7 that supplies the compressor 1.20 differential pressure oil supply system 11lb. 2b. Also, the pressure Mml. 2C) A person plumbing 9. Check valve 20. Provide 2l.

Next, the zero effect will be explained.

When two compressors are in operation, lubricating oil is supplied from the oil sump 8 to the oil supply pipe 6.
7 to the differential pressure oil supply device 1b, 2bK of the compressor 1.2: the pressure i1i1d 1 . 21C Serel. Compressor 1
．． The lubricating oil supplied to the compressor high pressure chamber 1a1
2al7' 3 section from the high pressure gas refrigerant, or discharge piping 12.18 from the compressor 1.2 together with the high pressure gas refrigerant.
It is discharged to the refrigeration cycle, circulates in the refrigeration cycle, and returns to the pressure 'aI machine 1.
．． Returned to 2. E embroidery machine high pressure damper l a r 2
The lubricant oil separated into s/a inside a is returned to the oil sump 8 through the oil return pipe 4.5. Therefore, the compressors 1 and 2 have lubricating oil in the common oil sump 8 instead of inside each, and by supplying lubricating oil from the oil sump 8 to the compressor 1.2, the compression engine IZ )+14 Can prevent lubricating oil from shifting.

When one compressor is in operation when one compressor is stopped for capacity control, the internal pressure in the high pressure chamber O of the compressor is determined by the check valve 20 installed in the suction pipe.
21, the internal pressure of the high-pressure chamber of the compressor that rotates four times is maintained equal to the pressure of the same part of the oil sump 3, and the differential pressure oil supply system of the compressor is linked to the pressure lIII machine, so the lf. Lubricating oil is not supplied to the compressor through the oil return pipe and oil supply pipe from the oil pump 8, and the lubricating oil is not supplied to the compressor while it is in operation through the oil return pipe and oil supply pipe from the nuclear oil sump 3. Lubricating oil is supplied. Furthermore, the check valve 20.2i1 can prevent the high-pressure gas refrigerant from flowing into the suction pipe through the stopped pressurizer.

Therefore, multiple units OFf:. ．．・．． By connecting the refrigeration system in parallel to the common/D piping system, a normal refrigeration cycle can be constructed and the necessary amount of lubricating oil in the compression region can be maintained.

Figure 2 is an example in which the pressure FA machine that is stopped for capacity control is limited to compression tank 2, and compared to Figure 1, the check valve zO on the pressure IA machine 1 side is removed. . The action is the same as in FIG.

[0 Effects of the Invention] As explained above, the present invention has a plurality of D compressors, and the capacity can be increased by controlling the Q-angle stop and rotation speed of these compressors. biI
In refrigeration equipment that performs J I'lill, it is possible to solve the problem of uneven lubricating oil between compressors, and to prevent O-liquid refrigerant from stagnation in the pressure and precision machines that are stopped for capacity control.
It is also possible to solve the problems of increased oil flow due to O liquid compression and forming during restart, and dilution of T oil by liquid refrigerant. Therefore, since the 0 operation control range of a plurality of 1f compressors can be expanded, there is an effect that fine capacity control is also possible.

[Brief explanation of drawings]

FIG. 1 is a diagram showing a configuration of a refrigeration system according to an embodiment O of the present invention, FIG. 2 is a diagram showing a configuration of another embodiment O of the present invention, and FIG. 1, 2... High pressure chamber type 0 scroll pressure m machine 8.
・・Oil supply device 4, 5・・Oil return pipe 6.7・・・・
Refueling iF 8.9.10...Suction piping 11,
lz, 18...Discharge piping 20, 21...Check valve. Figure 1 4, 5 Sodetomo Re 1 6, Ku Ayasodekan 2nd leap 3rd bacterium

Claims (1)

[Claims] 1. In a refrigeration system in which the suction pipes and discharge pipes of a plurality of high-pressure chamber type scroll compressors are connected in parallel, a common oil sump is provided to collect lubricating oil of each compressor. , an oil supply pipe for collecting lubricating oil in the oil sump from each compressor is communicated with the oil sump, and an oil supply pipe for supplying lubricating oil from the oil sump to each compressor, A refrigeration system characterized in that each compressor is connected to an oil supply system. 2. The refrigeration system according to item 1, characterized in that a check valve is provided in the suction section or suction pipe of each compressor. 3. The refrigeration system according to item 1, characterized in that a check valve is provided in the suction section or suction pipe of the compressor that is stopped for capacity control.