JPH0136064Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to an air-cooled refrigeration system suitable for use as an air conditioner or refrigerator, particularly for cooling or freezing throughout the year.

FIG. 1 is a diagram showing the configuration around the condenser of the above-mentioned refrigeration system, where 1 indicates a plurality of circuits 1.
A heat exchanger divided into a, 1b, and 1c, 2 is a blower, 3 is a gas header that distributes refrigerant gas, 4 is a liquid header that collects refrigerant liquid, 5 is a gas pipe connected to a compressor, and 6 is an expansion valve. A series of liquid pipes, 7 is a gas connection pipe whose one end is connected to the gas pipe 5, 8 is a liquid connection pipe whose one end is connected to the liquid header 4, and 9 is a gas connection pipe 7 connected to the gas port 9a, and a gas connection pipe 7 connected to the liquid port 9b. It is a condensing pressure regulating valve to which the liquid connection pipe 8 is connected and the outlet port 9c is connected to the liquid receiver 10, and the refrigerant gas compressed by the compressor passes through the gas pipe 5.
It flows into the condenser shown in FIG. In the normal case where the high-pressure refrigerant gas that has flowed into the condenser is condensed at a pressure higher than the operating pressure of the condensing pressure regulating valve 9, it passes through the gas header 3 and then flows through each circuit 1a, 1 of the heat exchanger 1.
b and 1c, and are cooled by air introduced into the heat exchanger 1 by the blower 2 and liquefied. This high-pressure refrigerant liquid is collected in a liquid header 4, passes through a liquid connection pipe 8, a condensation pressure regulating valve 9, and reaches a liquid receiver 10.
The liquid flows out of the condenser from the liquid pipe 6. Although not shown, an expansion valve, an evaporator, and a compressor are connected outside the condenser to form a refrigeration cycle.

Now, when the temperature of the air introduced into the heat exchanger 1 is low and the condensation pressure is lower than the operating pressure of the condensation pressure regulating valve 9, a portion of the refrigerant gas that has flowed into the heat exchanger 1 is
Pass through the gas connection pipe 7 connected to the gas pipe 5,
It passes through the condensation pressure regulating valve 9 and reaches the liquid receiver 10 . For this reason, the pressure inside the liquid receiver 10 is increased and the outflow of the high-pressure refrigerant liquid from the liquid connection pipe 8 is prevented, so the refrigerant liquid is stored in each circuit 1a, 1b, 1c of the heat exchanger 1, and heat is generated. By reducing the effective condensing heat exchange area of the exchanger 1, the condensing pressure is increased.

This prevents the refrigerant circulation flow rate from being choked due to insufficient pressure at the inlet of the expansion valve (not shown), and increases the evaporation pressure by increasing the condensation pressure, thereby preventing moisture generated from the air cooled by the evaporator from freezing. .

As described above, when the pressure of the inflowing refrigerant gas is lower than the operating pressure of the condensing pressure regulating valve 9, the condensing pressure regulating valve 9 operates to open the gas port 9a and narrow the liquid port 9b. Therefore, when starting when the outside temperature is low, the gas port 9a is fully open and the liquid port 9b is fully closed. The entire amount flows out from the liquid pipe 6 via the condensation pressure regulating valve 9 and the liquid receiver 10.

At the time of such a start, if sufficient liquid refrigerant does not remain after the liquid receiver 10, the condensing pressure cannot become higher than the operating pressure of the condensing pressure regulating valve 9.
The liquid port 9b is operated in a fully closed state, which has the disadvantage that normal cooling and freezing effects cannot be achieved.

In addition, the compressed high-temperature refrigerant gas flows directly to the evaporator (not shown), which has the disadvantage of heating the air that should be cooled.

Furthermore, the circulation of high-temperature refrigerant gas may cause accidents such as overheating of the compressor (not shown).

Therefore, as a way to improve the above drawbacks, the second
The proposed method is shown in FIG.

The proposal shown in FIG. 2 branches the liquid connection pipe 8,
A solenoid valve 21 is provided there, and this is connected between the condensing pressure regulating valve 9 and the liquid receiver 10, and the heat exchanger 1 is installed at a higher position than the liquid receiver 10 and the condensing pressure regulating valve 9. By keeping the solenoid valve 21 open during the stoppage, the refrigerant liquid flows from the heat exchanger 1 into the liquid receiver 10 due to gravity, and the liquid is full. The pressure increases and the aforementioned drawbacks are covered. However, in this proposal, the use of the solenoid valve 21 becomes expensive, and at the same time, an extra electric circuit is required to operate the solenoid valve 21, which may lead to a risk of lower reliability and cause heat generation. There is a drawback that the exchanger 1 must be placed in a high position, which is a layout restriction.

In addition, the proposal shown in Fig. 3 improves the drawback by providing a capillary 22 instead of the solenoid valve 21 of the one shown in Fig. 2, but it is necessary to place the heat exchanger 1 in a high position. However, it still has the disadvantage of being subject to layout restrictions.

The present invention was proposed in view of the above points, and its purpose is to provide air-cooled refrigeration equipment that performs cooling or freezing throughout the year.
To provide an air-cooled refrigeration system that is inexpensive, highly reliable, and can be started without being restricted by layout.

The present invention has an air-cooled condenser that divides the refrigerant gas from the compressor into a plurality of circuits via a gas header and condenses it, and when the condensing pressure decreases, a part of the refrigerant gas is bypassed to reduce the pressure of the high-pressure refrigerant liquid. In an air-cooled refrigeration system having a condensing pressure regulating valve, the condensing pressure regulating valve controls the condensing pressure by increasing the condensing pressure and accumulating the condensed refrigerant liquid in the air-cooled condenser to adjust the effective heat exchange area of the condenser. The gist of this is an air-cooled refrigeration system characterized in that a gas port is connected to the lower part of the gas header.As mentioned above, by connecting the gas port of the condensing pressure regulating valve to the lower part of the gas header, low Even if the gas port of the condensing pressure regulating valve is fully open when starting at outside temperature, the lower circuit and the lower part of the gas header are normally sealed with refrigerant liquid, so the refrigerant gas from the compressor will continue to flow. The refrigerant liquid stored in each circuit flows out to the gas header until the pressure loss of the refrigerant gas, which does not flow to the evaporator but flows sequentially from the upper circuit, exceeds the residual liquid head, causing the condensation pressure to rise rapidly and condensation. Since the operating pressure of the pressure regulating valve is reached, the liquid port of the valve is opened,
Provides normal cooling or freezing effects. Therefore, it is possible to provide an air-cooled refrigeration system that is inexpensive, highly reliable, and is not subject to layout restrictions, eliminating the drawbacks of the conventional systems described above.

The present invention will be explained below based on examples.

In FIG. 4, 1 to 10 are the same as the conventional ones, and the gas port 9 of the condensing pressure regulating valve 9
The gas connecting pipe 7 connected to a is connected to the lower part of the gas header 3, and when the condensing pressure is lower than the operating pressure of the condensing pressure regulating valve 9, the gas connecting pipe 7, condensing It is the same as the conventional one described above except that the refrigerant gas reaches the liquid receiver 10 via the pressure regulating valve 9.

When starting the engine when the outside temperature is low, the gas port 9a of the condensing pressure regulating valve 9 is fully open, and the liquid port 9b is fully closed.

At this time, the refrigerant liquid stored in the heat exchanger 1 is
Since each circuit 1a, 1b, 1c of the heat exchanger 1 is in communication with the gas header 3 and the liquid header 4, the lower circuit of the heat exchanger 1, for example 1
Since b and 1c are full of refrigerant liquid, the gas header 3 is also liquid-sealed at a corresponding height.

When starting in this condition, the inflowing refrigerant gas will
The refrigerant liquid in the gas header 3 is pushed out to the liquid receiver 10, and the liquid level in the gas header 3 disappears.

Immediately after startup, since the upper circuit of the heat exchanger 1, for example, the circuit 1a, is not sealed with liquid, condensation gradually starts in this circuit.

The circuit located at the bottom, for example, circuit 1
b and 1c are full of refrigerant liquid, and the pressure in circuit 1c is higher than that in the lower circuit, for example, circuit 1b, only in the liquid head of circuit 1b, so as mentioned above, the liquid level in gas header 3 increases. As the refrigerant liquid runs out, the refrigerant liquid flows out to the gas header 3. The refrigerant liquid in the circuit 1b decreases by this amount, and condensation begins gradually in the circuit 1b.

In this way, the stored refrigerant liquid gradually spreads to the lower circuit until the pressure loss of the refrigerant gas flowing into each circuit exceeds the residual liquid head.
By flowing out to the gas header 3, the condensing pressure quickly rises and reaches the operating pressure of the condensing pressure regulating valve 9, and the liquid port 9b is opened so that normal cooling and freezing effects can be performed.

Also, at this time, the high-temperature refrigerant gas compressed by the compressor (not shown) is cooled by mixing the refrigerant liquid into the refrigerant gas flowing into the evaporator (not shown), so it must be cooled. This prevents the air from heating up when it should not be heated.

Furthermore, the refrigerant liquid stored in the heat exchanger 1 during stoppage is collected into the liquid receiver 10 along with the flow of refrigerant gas during startup, so that the heat exchanger 1 must be placed at the top of the liquid receiver 10. You will no longer be subject to layout restrictions.

[Brief explanation of drawings]

FIGS. 1, 2, and 3 are block diagrams showing different conventional examples, and FIG. 4 is a block diagram showing an embodiment of the present invention. 1...Heat exchanger, 1a, 1b, 1c...Circuit, 2...Blower device, 3...Gas header, 4
...Liquid header, 5...Gas piping, 6...Liquid piping, 7...Gas connection pipe, 8...Liquid connection pipe, 9...
Condensing pressure regulating valve, 9a...Gas port, 9b...
Liquid port, 9c...Outlet port, 10...Liquid receiver.

Claims (1)

[Scope of utility model registration request] It has an air-cooled condenser that divides the refrigerant gas from the compressor into a plurality of circuits via a gas header and condenses it, and when the condensing pressure decreases, a part of the refrigerant gas is bypassed to increase the pressure of the high-pressure refrigerant liquid,
In an air-cooled refrigeration system having a condensing pressure regulating valve that controls condensing pressure by storing condensed refrigerant liquid in the air-cooled condenser and adjusting an effective heat exchange area of the condenser, a gas port of the condensing pressure regulating valve. is connected to the lower part of the gas header.