JPS6014058A - Air conditioner - 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 gas injection type cooling 11F device.

Structure of a conventional example and its problems FIG. 1 shows a conventional gas injection type air conditioning system.

In the figure, (]) is the compressor, (2) is the condenser, (3)
is the first capillary tube which is the first pressure reducing device, (4
) is a gas-liquid separator, (5) is a second capillary tube which is a second pressure reducing device, and (6) is an evaporator, which are connected in sequence to constitute a refrigeration cycle /I/ .

Further, (7) is an injection pipe, which is connected to the gas phase part of the gas-liquid separator (4) and the compressor +1+'Th.

In the conventional air conditioning system having the above configuration, the gas refrigerant discharged from the compressor +11 is liquefied in the condenser (2), reduced in pressure in the first capillary tube (3), and then sent to the gas-liquid separator (4). Inflow. Gas-liquid separator (4
) The liquid refrigerant separated in the second cavity tube (5)
The pressure is further reduced by the evaporator (6), and the gas is gasified in the evaporator (6) before being sucked into the compressor [11]. On the other hand, a gas-liquid separator (
The gas refrigerant separated in step 4) is transferred to the injection pipe (7).
) and is injected into the compression Q(+1).

FIG. 2 shows the relationship between the pressure PL of the gas-liquid separator (4) and the amount of gas injected into the compressor (1) in gf/ in the air conditioning system. Here, the pressure Pi of the gas-liquid separator (4)
is P where all the generated gas can be injected into the compressor (1).
imlC is set. The Mollier diagram for this Pim is as shown in FIG. As is clear from the graph, the lower Plm is, the more the gas injection amount increases (as this raises the intersection point gim'e with the injection amount curve shown by the solid line along the generated gas amount curve shown by the broken line in Fig. 2), and the gas injection amount increases. As a result, the cooling effect can be increased and the heating capacity can be increased. However, since pim is determined by the specifications of the compressor (1) adopted in the basic design of the refrigeration cycle, it is very difficult to reduce it. Therefore, the device is operated at a relatively high Pim, and the amount of gas injected is small, so that a sufficient refrigeration effect cannot be obtained and the heating capacity tends to be insufficient.

Purpose of the Invention In order to solve such problems, it is an object of the present invention to provide an air conditioning system with a sufficiently high heating capacity by lowering the gas injection pressure from the gas-liquid separator to the compressor. It is something.

Structure of the Invention In order to achieve this object, the present invention provides a first cylinder of a two-cylinder compressor with combined discharge ports, a condenser, a first pressure reduction device, a gas-liquid separator, and a second pressure reduction device. and an evaporator are successively connected to constitute a refrigeration cycle, and an injection pipe is provided for injecting the gas refrigerant separated by the gas-liquid separator into the first cylinder of the two-cylinder compressor, and the gas-liquid separation The gas phase part of the compressor or the injection pipe is connected to the suction side of the second cylinder of the two-cylinder compressor.

With the above configuration, the present invention discharges all the large amount of gas generated at a sufficiently low pressure in the gas-liquid separator to the condenser side through the two-cylinder compressor, thereby increasing the refrigeration effect and reducing the amount of refrigerant discharged. By increasing the heating capacity, a sufficiently high heating capacity can be obtained.

DESCRIPTION OF EMBODIMENTS The present invention will be described below with reference to FIG. 4 showing one embodiment thereof.

In FIG. 4, (8) is a two-cylinder compressor of discharge port merging type. In the structure of this compressor (8), (9) is the first cylinder, (10) is the first suction pipe, θ is the second cylinder,
(13) is a second suction pipe, (14) is a second piston, and (15) is a common discharge pipe. Next, (1φ is the condenser, (17) is the first capillary tube which is the first pressure reducing device, Qa is the gas-liquid separator, θ9) is the second capillary tube which is the second pressure reducing device, □ □□) is the evaporator,
These are connected in sequence, and the outlet of the evaporator (b) is connected to the suction pipe (10) in the first cylinder (9) of two cylinders of compression m, +81 to form a refrigeration cycle. (21) is an injection pipe, which connects the gas phase part of the island gas-liquid separator (181) and the other suction pipe of the first cylinder (9) of the two-cylinder compressor (8) to complement the refrigeration cycle. On the other hand, the injection pipe (21
) is further branched according to the US invention and connected to the second cylinder (13) via the second suction pipe (13)'ff:.

In the above configuration, the high-temperature, high-pressure gas refrigerant discharged from the discharge pipe (15) of the two-cylinder compressor (8) is liquefied in the condenser (1 (9), and then liquefied in the first capillary tube (1
7) and then flows into the gas-liquid separator (181).

The liquid refrigerant separated in the gas-liquid separator (+8) is further reduced in pressure in the second capillary tube (19), and then transferred to the evaporator (
After being gasified in the first suction pipe (+0), it is sucked into the first cylinder (9) of the two-cylinder compressor (8) by the rotation of the first piston (11).

On the other hand, a part of the gas refrigerant separated in the gas-liquid separator (+8) is injected into the first cylinder (9) through the injection pipe 1). The suction and injection into the first cylinder (9) is based on the rotation of the first piston (river). (+4) rotation causes suction into the second cylinder (1 liter) through the second suction pipe (13).

The Mollier diagram improved by this is shown in FIG. Therefore, the pressure of the gas-liquid separator (18) is lowered to below the pressure pim at which the amount of gas generated in the gas-liquid separator (18) and the amount of gas injected into the first cylinder (9) of the two-cylinder compressor (8) are equal. All settings can be made. That is, the fact that the set pressure of the gas-liquid separator (18) is lower than the Pim means that a larger amount of gas refrigerant is generated in the gas-liquid separator (+8), and as a result, the injection pipe f21 )'i, the remaining -1 gas refrigerant that cannot be injected into the first cylinder (9) is introduced into the second cylinder (12), and as a result, the refrigerant flow rate in the condenser 06) and the evaporator (3 ) can increase the refrigeration effect, and can sufficiently increase the heating capacity.

In addition to the large refrigeration effect, the compressor can be cooled by the saturated vapor of the suction gas in the second cylinder. Furthermore, if there is one motor, from seven,
Not only can you obtain a highly efficient and reliable heating and cooling system, but the pressure setting of the gas-liquid separator θ barrel can be changed over a wide range due to the specifications of the second cylinder +21, making it possible to adjust the heating capacity over a wide range. .

The functions and effects described above are the same as those of the injection pipe 1.
) and the second suction pipe (+3) f, connect the second suction pipe +13
),! : The same result can be obtained by communicating with the first cylinder (9) through an injection port.

Effects of the Invention As described above, the air conditioning system of the present invention sequentially connects the first cylinder of a two-cylinder compressor, the first pressure reducing device, the gas-liquid separator, the second pressure reducing device, and the evaporator. When a refrigeration cycle is configured, an injection pipe is provided for injecting the gas refrigerant separated by the gas-liquid separator into the first cylinder of the two-cylinder compressor, and the gas-phase neck of the gas-liquid separator is The injection pipe s' is placed on the suction side of the second cylinder of the two-cylinder compressor, which not only provides sufficient heating capacity but also enables efficient and reliable operation. It also has the advantage of being easy to adjust the heating capacity over a wide range.

[Brief explanation of the drawing]

Figure 1 is a refrigerant circuit diagram of a conventional air-conditioning and heating system; Figure 2 is a diagram showing the relationship between the pressure of the gas-liquid separator and the amount of gas injection in the conventional air-conditioning system; and Figure 3 is a diagram of the conventional air-conditioning system. FIG. 4 is a refrigerant circuit diagram of a heating and cooling system showing one embodiment of the present invention, and FIG. 5 is a Mollier diagram of the heating and cooling system. (8) 2 cylinder compressor (9)
・・・・・・・・・First cylinder (１ノ、・・・・
―・Second cylinder (country・・・・Condenser (17)・・・・・First capillary tube (181・・・・・・・・・・・Liquid separator (1
9) ・・・・・・−Second Capillary Tube (Company)・・・・・・・・・Evaporator +211・・・
・・・Injection conduit patent applicant Matsushita Electric Industrial Co., Ltd. Agent Kenji Arata) Figure 1 2 □ Figure 4

Claims (1)

[Claims] A refrigeration cycle is constructed by sequentially connecting the first cylinder of the discharge port merging type two-cylinder compressor, the condenser, the first pressure reducing device, the gas-liquid separator, the second pressure reducing device, and the evaporator. At the same time, an injection pipe is provided for injecting the gas refrigerant separated by the gas-liquid separator into the first cylinder of the two-cylinder compressor, and the gas phase part of the gas-liquid separator or the injection pipe is connected to the 2nd cylinder compressor
Heating and cooling equipment on the suction side of the cylinder.