JPS58195751A - Refrigeration cycle device - 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 The present invention relates to a refrigeration cycle device equipped with a plurality of high-pressure shell compressors.

Conventionally, refrigeration cycle equipment equipped with multiple low-pressure shell compressors had low pressure inside the shells, so as a means of equalizing the oil amount in each compressor, the shells of each compressor were connected by pressure equalizing pipes that equalized the pressure throughout the shell. . However, in high-pressure shell type compressors, because the shells are under high pressure, if each compressor is connected with a pressure equalization pipe, oil will accumulate inside the cylinder through the discharge valve of the compressor when it is stopped and the hot water supply pipe to the cylinder, and oil will accumulate in the cylinder when starting up. Seeds may be generated and the compressor may malfunction. And, with the conventional method of connecting the accumulator and compressor by extending one pipe from the accumulator and branching out to multiple compressors, it is difficult to return the required amount of oil to each compressor, resulting in an excessive amount of oil. However, a compressor with an insufficient amount of oil was produced, and a compressor with an insufficient amount of oil had the disadvantage of causing seizing. Furthermore, this is not a problem when all compressors are operating, but when some are operating and others are stopped, refrigerant and oil will be drawn into the operating compressors. In this case, oil from the stopped compressor passes through the valve and oil supply port to the cylinder and moves to the operating compressor. Since this tendency is particularly large when the refrigeration cycle device is first started up, there is a risk of seizure occurring when the stopped compressor is started up.

This invention was made to eliminate the above-mentioned drawbacks, and involves connecting a plurality of high-pressure shell compressors in parallel.

In a refrigeration cycle device in which a condenser, a pressure reducer, an evaporator, and an accumulator are connected in series, the individual compressors and accumulators are connected through piping with a check valve in the middle, and the individual compressors and accumulators are connected in series. A check valve is installed in each pipe that connects the compressor and condenser.

An embodiment of the present invention shown in FIGS. 1 and 2 will be explained in detail below. Figure 1 is a refrigerant circuit diagram, with compressor +1
1. +21 are connected in parallel, each with a check valve +31.
+41 to the condenser (
5). Condenser (5), expansion device 1 as pressure reducing device:.

The evaporator (6), the evaporator (7) and the accumulator (8) are connected in series. Accumulator (81 and the above compressor (1)
.

(2) are connected by individual suction pipes +9) and (101).

:1' Each suction pipe (9+, (101) has a check valve (111, l12J, u6i-'tt, -=, b).

! 7””! ,A! +91. . . 3°K. 6 each compressor (1+, (2+) capacity.

Figure 2 shows the accumulator (81 and suction pipe +91.
01, the pipe (13) connecting the evaporator (7) and the accumulator (81) has its outlet located further inside the accumulator (81) than the suction port of the suction pipe (9), α0). It is located at the bottom.

In the refrigeration cycle device configured as above, when compressors fil and +21 are operated simultaneously, compressor (1)
.

(The high-temperature, high-pressure gas refrigerant compressed by the check valve (31)
As per ゜(4), it radiates heat in the condenser (5) and becomes a high-temperature, high-pressure liquid. It becomes a low-temperature, low-pressure liquid refrigerant in the expansion device (6). It absorbs heat in the evaporator (7), evaporates, and becomes a gas. The refrigerant and oil that have flowed into the accumulator (8) pass through the suction pipe +91. flol to the compressor +I.
+, (inhaled into 2+. In addition, the compressor il+, +2
The refrigerant and oil that are inhaled into 1 are inhaled! +91. Since the diameter of the pipe α0) matches the capacity of the compressor tll, +21, the required amount is sucked in, and there is no possibility of an excessive amount of oil or overflow.

In addition, when either one of the compressors (2) is operating, the compressor □ba i: - (21 has check valves (31, +41) on the discharge side and suction side, respectively, so when it is stopped, Refrigerant does not stay in the compressor.In addition, the suction pipe +9L (
Check valve fill (12+) is provided at 101, so oil from the stopped compressor will not be drawn into the running compressor.In addition, for the running compressor, connect the suction pipe to a pipe that matches the capacity. Since each accumulator (81) is installed in a separate accumulator (81), the flow rate of the refrigerant will not become small and a sufficient amount will not return from the oil return hole, which is the case when using a single suction pipe. It can be inhaled into a full-oil pressure machine.

Although the above embodiment has been described with reference to two compressors, the number of compressors is not limited to two.

As described above, the present invention can prevent unevenness in the amount of oil in a compressor having a plurality of high-pressure shells, and can provide a highly reliable refrigeration cycle device.

[Brief explanation of the drawing]

FIG. 1 shows a refrigerant circuit 1 of a refrigeration cycle device showing an embodiment of the present invention. The second part 1 is a diagram showing the connection relationship between the accumulator and the suction pipe. The same symbols in the figures indicate the same or corresponding parts, [11゜ (21 is the compressor, (3+, (4) is the check valve, (5)
is a condenser, (6j is a pressure reducing device, (7) is an evaporator, +9
1. (101 is suction/θ, +111. (12+ is check valve. Agent Makoto Kazuno)

Claims (1)

[Claims] In a refrigeration cycle system in which multiple high-pressure shell compressors are all connected in parallel, and the parallel-connected compressors, condensers, pressure reducers, evaporators, and accumulators are connected in series, each back check is performed midway. Each pipe provided with a valve connects the individual compressor and the accumulator, and a check valve is provided in each pipe connecting the individual compressor and the condenser. Refrigeration cycle equipment with all features.