JPH03260556A - Refrigeration cycle 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 cycle device, in particular, to an intermediate pressure injection system using a compressor having an injection port separate from a suction port and a discharge port. This invention relates to a refrigeration cycle device.

[Prior Art] Fig. 3 is a system diagram showing a refrigeration cycle device disclosed in Japanese Utility Model Application Publication No. 56-152279.
is a compressor with an injection port (2), (3
) is a condenser, (4) is a first pressure reducing device, (5) is a gas-liquid separator, (6) is a second pressure reducing device, and (7) is an evaporator, and these are connected in series and annularly to the refrigerant pipe ( 8). The gas-liquid separator (5) and the injection port (2) of the compressor (1) are connected by a gas injection pipe (10) with an on-off valve (9) interposed therebetween.

In addition, a bypass pressure reduction device (11) is connected in parallel between the gas-liquid separator (5) and the second pressure reduction device w (6), and this bypass pressure reduction device (11) is connected as shown in Fig. 4. , one end thereof is opened to the liquid level control position CB) in the gas-liquid separator (5), and the other end is connected to the outlet side of the second pressure reducing device (6).

Next, the operation will be explained. The refrigerant gas that has become high temperature and high pressure in the compressor (1) is heat exchanged and liquefied in the condenser (3).
First decompression device! (4) and is depressurized to intermediate pressure,
It becomes a gas-liquid two-phase state and flows into the gas-liquid separator (5).

The liquid refrigerant separated by the gas-liquid separator (5) is further depressurized by the second pressure reducing device w (6), becomes a low-pressure gas-liquid two-phase refrigerant, and flows into the evaporator (7), where it undergoes heat exchange. It is gasified and flows into the compressor (1).

On the other hand, the gas refrigerant separated by the gas-liquid separator (5) is separated by the on-off valve (
Gas injection pipe (10)
) of the compressor (1) through the injection port (2
) is injected into.

When the load fluctuation in the system is small, one end of the bypass pressure reducing device I (11) opens at the liquid level control position (B) in the gas-liquid separator (5) due to this load fluctuation. When the refrigerant liquid level attempts to rise above this control position (B), the liquid refrigerant corresponding to the rise is transferred to the bypass pressure reducing device t.
Since the refrigerant is discharged to the outlet side of the second pressure reducing device (6) through (11), an excessive rise in the refrigerant liquid level within the gas-liquid separator (5) is prevented.

[Problems to be Solved by the Invention] Conventional refrigeration cycle devices are configured as described above, and only gas is injected into the compressor, so the temperature of the compressor becomes high and the temperature of the compressor increases, especially during heating operation. There was a problem that heat radiation loss increased and efficiency decreased due to the large temperature difference between the The purpose is to enable high-efficiency operation.

[Means for Solving the Problems] In the refrigeration cycle device according to the present invention, a gas-liquid separator (5
) and the injection port (2) of the compressor (1) is inserted upward from the bottom of the gas-liquid needle JI1m into the tip of the injection pipe (10) that connects the injection port (2) of the compressor (1), and the tip is opened into the internal gas reservoir. A rising portion (10a) is formed, and an inlet hole (IOB) for introducing the liquid refrigerant in the gas-liquid separator is provided below the rising portion.

[Function] In the case of this invention, in addition to the gas refrigerant in the gas-liquid separator through the rising part of the injection pipe, liquid refrigerant is simultaneously sent to the injection port of the compressor from the suction hole provided in this rising part, and the injection This increases the cooling effect of the compressor.

[Example] An example of the present invention will be described below. That is, in FIGS. 1 and 2, the same or corresponding parts as in the conventional one shown in FIG. is inserted upward from the bottom of the gas-liquid separator (5).

A rising portion (10a) is formed whose tip is opened into the gas reservoir inside the rising portion (10a).
It is characterized in that a suction hole (10b) is provided at the lower part of the gas-liquid separator to introduce the liquid refrigerant in the gas-liquid separator.

Next, the operation will be explained. The refrigerant gas that has become high temperature and high pressure in the compressor (1) undergoes heat exchange and liquefies in the condenser (3).
The pressure is reduced to an intermediate pressure by the first pressure reducing device [(4), and the gas-liquid two-phase state flows into the gas-liquid separator (5). The liquid refrigerant separated by this gas-liquid separator (5) is transferred to the second pressure reducing device t (
6), the pressure is further reduced to a lower pressure.

Next, it is gasified by heat exchange in the evaporator (7) and sent to the compressor (
1) is inhaled and circulated.

On the other hand, the gas refrigerant separated by the gas-liquid separator (5) flows from the tip of the rising portion (10a) of the injection pipe (10), which is open into the gas reservoir above the refrigerant liquid level (A). At the same time, liquid refrigerant also flows in from the suction hole (10b) provided at the bottom of the rising portion (10a), and is compressed via the on-off valve (9). It is supplied to the injection port (2) of (1) and circulated.

[Effects of the Invention] Since the refrigeration cycle device of the present invention is configured as described above, it is possible to inject liquid refrigerant into the compressor in addition to gas refrigerant with extremely simple construction means. This has the effect of suppressing the temperature rise and allowing highly efficient operation.

[Brief explanation of drawings]

Fig. 1 is a system diagram showing an embodiment of the refrigeration cycle device of the present invention, Fig. 2 is an enlarged sectional view showing the inside of the gas-liquid separator in the inventive device, and Fig. 3 is a diagram showing a conventional refrigeration cycle device. The system diagram shown in FIG. 4 is an enlarged sectional view showing the inside of the gas-liquid separator. In the figure, (1) is the compressor, (2) is the injection port, (3) is the condenser, (4) is the first pressure reducing device, and (5)
is a gas-liquid separator, (6) is a second pressure reducing device, (7) is an evaporator, (8) is a refrigerant pipe, (10) is a gas injection pipe, (10a) is a rising part, and (10b) is a suction hole. It is. In other figures, the same reference numerals indicate the same or corresponding parts.

Claims (1)

[Claims] A condenser, a first pressure reducing device, a gas-liquid separator, a second pressure reducing device, and an evaporator are sequentially connected in series with a refrigerant pipe between a discharge port and a suction port of a compressor having an injection port. In a refrigeration cycle configured by connecting the injection port of the machine and the gas storage part of the gas-liquid separator with a gas injection pipe, the gas injection pipe is inserted into the tip of the gas injection pipe upward from the bottom of the gas-liquid separator. The liquid refrigerant in the gas-liquid separator is introduced into the lower part of this rising part, and is compressed together with the gas refrigerant passing through the injection pipe. A refrigeration cycle device characterized by having a suction hole for supplying to the injection port of the machine.