JPS60105870A - Refrigeration cycle - 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 system (Noikle) equipped with a plurality of coolers.
In particular, it relates to an improved injection circuit operation.

[Technical background of the invention]

For example, in the freezing cycle of a refrigerator, dedicated coolers are installed for each of the freezing and refrigerating compartments to cool them separately.
In this type, when the flow path control valve is opened, the refrigerant flows through the refrigerant flow path of '51 only through the freezer compartment cooler, and one flow path control valve is installed during the cycle. It is common to control the refrigerant so that it flows into the second refrigerant flow path through both the refrigeration cooler and the refrigeration cooler when the refrigeration cycle is opened. In order to achieve electric power generation, a gas-liquid separator is installed to receive the refrigerant from the condenser on the upstream side of the flow path control valve, and a part of the liquid refrigerant is returned from this gas-liquid separator to the compressor. A model equipped with an injection circuit that cools the compressor winding is available.

[Problems with background technology]

However, from 4t (-) according to the conventional configuration, the first and second
No matter which refrigerant flow path the refrigerant is allowed to flow through, the injection circuit will inevitably operate and a portion of the liquid refrigerant will be returned to the compressor. Therefore, if the refrigerant is flowed into the second refrigerant flow path that is connected to two coolers and has a large thermal load, the winding temperature of the compressor 4 will tend to rise due to the large thermal load. Although this cooling can be effective in saving power, if the refrigerant is flowed through the first refrigerant flow path, which is connected to only one cooler and has a small thermal load, Since the liquid refrigerant is not as high as the left side, the loss caused by consuming a part of the liquid refrigerant in the injection circuit exceeds the power saving effect of winding cooling, and the problem arises that the power consumption increases. The reality is that it is still not possible to achieve sufficient power savings. In order to deal with this problem, a solenoid valve is provided in the injection circuit, and the solenoid valve is connected to the second refrigerant flow path, which has a large thermal load. It is also possible to configure it so that it flows,
This poses a problem in that not only does the cost of the separator including the solenoid valve increase, but also the total power consumption of the solenoid valve increases.

(Object of the Invention) The present invention has been made in view of the above circumstances, and its object is to reduce the cost of parts by adding f' solenoid valves, etc.
It is an object of the present invention to provide a refrigeration cycle that can operate the IN919232 circuit only when the thermal load is large without increasing the fiA cost and power ω, and can achieve sufficient overall power saving.

[Summary of the invention]

The present invention connects an injection pipe to a gas-liquid separator that receives refrigerant from a condenser and returns the liquid refrigerant in the gas-liquid separator to a compressor, Thermal load is removed from the gas-liquid separator by configuring the open end of the refrigerant supply pipe to the refrigerant flow path, which is the source of the thermal load, to be located approximately at or below the open end of the refrigerant supply pipe. It is characterized by covering the injection pipe so that when the refrigerant flows into the refrigerant supply pipe of the large refrigerant flow path, the injection pipe also flows.

[Embodiments of the invention]

A first embodiment of the present invention will be described below with reference to FIGS. 1 to 3. 1 is a rotary compressor, 2 is a condenser, and 3 is a flow path control valve.

To explain the flow path control valve 3 in detail, 4 is a valve case, which includes a cylindrical case main body 5 and an upwardly directed single-shaped tube that communicates with the case main body 5 and integrally protrudes from its side wall. It consists of a liquid reservoir part 6. A valve hole 7 is formed in a portion of the main body 5 of the case that extends downward from the protruding portion of the liquid reservoir 6. 8 is a coil provided to close the upper end of the case main body 5; 9 is a plunger provided within the case main body 5 so as to be driven by the coil 8; the plunger 9 has a tapered lower end and is connected to the coil 8; The valve hole 7 is opened and closed as electricity is turned on and off. One end of the brazing material that closes the upper end of the opening of the liquid reservoir 6 of the valve case 4 is connected to the capacitor 2.
The other end of the main capillary tube 10 connected to the liquid reservoir 6 is buried so as to communicate with the liquid reservoir 6.
The capacitor 2 is passed through the main capillary tube 10 by
It's from the side. Therefore, this gas-liquid separator 11 is integrated with the flow path control valve 3, and the liquid refrigerant in the gas-liquid separator 11 immediately flows into the case main body 5 of the flow path control valve 3. On the other hand, 12 is a refrigerator compartment cooler, 13 is a freezer compartment cooler provided downstream thereof, and 14 is a check valve installed between the freezer compartment cooler 13 and the rotary compressor 1.

Reference numeral 15 denotes a first refrigerant supply pipe connected to the lower end of the case main body 5 of the flow path control valve 3 so as to communicate with the valve hole 7. The refrigerant from the gas-liquid separator 11 is transferred to the first refrigerant supply pipe 15 when the gas-liquid separator 3 is opened.
, constitutes a first refrigerant flow path 17 that sequentially flows through the frozen palm-side capillary tube 16 and the freezer compartment cooler 13. Since this first refrigerant flow path 77 is configured to supply refrigerant only to the freezer compartment cooler 13, its thermal load is small.

18 is a second refrigerant supply pipe connected to the gas-liquid separator 11;
The opening end on the inflow side of this is the liquid reservoir part 6rL1 of the valve case 4.
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Jl direction l+a,, IJ”-retube 19, shutoff valve 20
The liquid refrigerant accumulated in the gas-liquid separator 11 is converted into a second refrigerant when the flow path control valve 3 is closed. A second refrigerant flow path 22 is configured that flows into the supply pipe 18 and supplies the refrigerant to both coolers 12 and 13 for the refrigerator compartment and the freezer compartment. Since this second refrigerant flow path 22 supplies refrigerant to both coolers 12 and 13, its thermal load is greater than that of the first refrigerant flow path 17. Note that the flow resistance of the second refrigerant flow path 22 is set larger than that of the first refrigerant flow path 17. Further, the cutoff valve 20 is closed when the rotary compressor 1 is stopped, and traps the high-temperature, high-pressure refrigerant on the condenser 2 side between it and the check valve 14 to prevent it from flowing into the respective coolers 12 and 13. Now, 2
Reference numeral 3 denotes an injection pipe, the inlet side of which is inserted into the liquid reservoir 6 of the gas-liquid separator 11, and the opening end thereof is connected to the second refrigerant passage 21, which has a large thermal load. The refrigerant supply pipe] 8 is located slightly lower than the open end thereof, and its outflow side is communicated with the interior of the rotary compressor 1 via an injection capillary duplex 24.

Next, the operation of the above configuration will be described. When the temperature in the freezer compartment and the refrigerator compartment rises to a set temperature or higher, the rotary conbrella 1-1 is driven while the flow path control valve 3 remains closed, and the cutoff valve 20 is opened.

As a result, the refrigerant liquefied in the condenser 2 flows into the gas-liquid separator 11 through the main capillary duplex 10, and the liquid refrigerant flows into the valve case 4.

The liquid level of the liquid refrigerant in the valve case 4 is lower than the injection pipe 23.
When reaching the upper part of the frontage end J:, a part of the liquid refrigerant first flows into the injection pipe 23 and is returned to the rotary compressor 1, and the liquid level further rises until the opening of the second refrigerant supply pipe 18. When the liquid refrigerant reaches the upper level than the end (see Fig. 2), the remaining liquid refrigerant flows into the second refrigerant supply pipe 18 and flows through the second refrigerant flow path 22. Refrigerant is supplied to both coolers 12 and 13 to cool the refrigerator compartment and the freezer compartment. At this point, since the second refrigerant flow path 22 has a large thermal load, the winding temperature of the rotary compressor 1 keeps rising, but the rotary compressor 1
Since liquid refrigerant is injected into the interior through the injection pipe 23, when the liquid refrigerant evaporates, the windings are cooled and temperature rise is suppressed. As a result, the power consumption within the rotary compressor 1 can be kept low.
The amount of power saved more than compensates for the loss caused by part of the liquid refrigerant being consumed within the rotary compressor 1, so that overall power savings can be achieved. When the inside of the refrigerator compartment is cooled down to a set temperature or lower through such cooling operation, the coil 8 of the flow path control valve 3 is energized, the plunger 9 is displaced upward, and the flow path control valve 3 is turned on. It becomes open. As a result, the liquid refrigerant in the valve case 4 flows into the first refrigerant flow path 17, is supplied to the freezer compartment cooler 13, and only continues cooling the freezer compartment. At this time, the liquid level of the liquid refrigerant in the valve case 4 decreases because the flow path resistance of the first refrigerant flow path 17 is smaller than that of the second refrigerant flow path 22. Since it is located below the opening end (see FIG. 3), the liquid refrigerant does not flow into the injection pipe 23 but only into the first refrigerant flow path 17. Therefore, a part of the liquid refrigerant does not pass through the injection pipe 22 and be consumed within the rotary compressor 1.
All liquid refrigerants will effectively contribute to the cooling U1 of the freezer compartment. Even with this configuration in which liquid refrigerant is not supplied into the rotary compressor 1, the thermal load on the first refrigerant flow path 17 is small and the winding temperature of the rotary compressor 1 hardly rises, so the rotary compressor v1 There will be no increase in power consumption. In addition, this sharp gas-liquid separator 1
The gas phase portion inside the rotary compressor 1 remains in communication with the inside of the rotary compressor 1 through the injection pipe 23 and the injection tube 24.
Since the flow path resistance of the injection gear pillar tube 24 is sufficiently large, leakage of waste refrigerant into the rotary compressor 1 can be prevented as much as possible. When the inside of the freezer compartment is cooled to below the set temperature by such cooling operation, the mouth-tally compressor 1° is stopped, and the flow path control valve 3 and the shutoff valve 20 are idled to return to the initial state. .

As described above, according to this embodiment, a part of the liquid refrigerant is returned into the rotary compressor 1 through the injection pipe 23 only when the refrigerant is flowing into the second refrigerant flow path 22, When the refrigerant flows through the refrigerant flow path 17, the liquid refrigerant is not returned to the rotary compressor 1 and all of the refrigerant is allowed to contribute to the cold air 1j in the freezer compartment. If the winding temperature of the rotary compressor 1 does not rise as much, the liquid refrigerant will be wasted and the operating efficiency will be reduced. can be prevented from deteriorating.

This makes it possible to achieve sufficient power saving overall. Moreover, although it has such an excellent effect, the height of the liquid refrigerant in the gas-liquid separator 11 does not allow the refrigerant to flow into either of the first and second refrigerant channels 17 and 22. Injection pipe 2 takes advantage of the fact that it differs depending on the flow.
Since the configuration controls the inflow of liquid refrigerant into the injection pipe 23, unlike the configuration in which a solenoid valve is installed in the middle of the injection pipe 23, there is almost no increase in parts cost I~, and of course there is a risk that power consumption will increase. Nor.

Next, FIG. 4 shows a second embodiment of the present invention, which differs from the first embodiment in that a first refrigerant supply pipe 15 and a freezer compartment cooling This is where the auxiliary cooler 25 located in the freezer compartment is connected between the refrigerator and the refrigerator 13. Since this auxiliary cooling unit 25 is disposed in the freezer compartment and is relatively small, the thermal load on the first refrigerant flow path 17 as a whole is smaller than that on the second refrigerant flow path 22. Even if configured as shown in FIG. Achieve comprehensive power savings.

FIG. 5 shows a third embodiment of the present invention, which differs from the first embodiment in that a flow path control valve 26 is provided between the first refrigerant supply pipe 15 and the capillary tube 21 for the refrigerator compartment. A liquid reservoir 27 is provided separately from the flow path control valve 26, and the first and second refrigerant supply pipes 1 are provided at the bottom of the liquid reservoir 27.
5.18, and the main key 17 pillar tube 10 and injection pipe 23 are connected to the upper wall of the liquid reservoir 27 to form a gas-liquid separator 28.

Even if J3 is used in this third embodiment, the injection pipe 23
The open end in the gas-liquid separator 28 is located at a slightly lower level than the open end of the second refrigerant supply pipe 18. Even with such a configuration, the same effects as those of the first and second embodiments can be obtained.

In each of the above embodiments, the open end of the injection pipe 23 in the gas-liquid separator 11.28 is located slightly lower than that of the second refrigerant supply pipe 18, but the present invention does not necessarily require this. However, the present invention is not limited to this, and both opening ends may be arranged at approximately the same level. In addition, the present invention can be practiced with appropriate modifications within the scope of the gist, such as not necessarily providing the shutoff valve 20, and the compressor may be of a reciprocating type.

〔Effect of the invention〕

As described above, the present invention connects a gas-liquid separator that receives refrigerant from a condenser with an injection pipe that returns liquid refrigerant in the gas-liquid separator to a compressor, and connects the gas-liquid valve of the injection pipe. 1Ili1The feature is that the opening end of the refrigerant supply pipe to the refrigerant flow path, which is the source of thermal load, is located approximately at the same level or lower than that,
With this, when the refrigerant flows into the refrigerant flow path with a large thermal load, a part of the liquid refrigerant returns to the compressor 1 through the injection pipe, suppressing the tendency of the winding temperature to rise, and reducing the thermal load. When the refrigerant flows into the small refrigerant flow path, it is possible to prevent the liquid refrigerant from flowing into the injection pipe and being wasted, which has the excellent effect of achieving sufficient overall power saving. do.

[Brief explanation of the drawing]

1 to 3 show a first embodiment of the present invention, FIG. 1 is a refrigeration cycle diagram, FIGS. 2 and 3 are longitudinal sectional views of the flow path control valve shown in different states, and FIG. The figure shows the second embodiment and corresponds to FIG. 1, and FIG. 5 shows the third embodiment and corresponds to FIG. 13, 26 are flow path control valves, 4 is a valve case, 11.28
1 is a gas-liquid separator, 12 is a refrigerator cooler, 13 is a refrigeration cooler, 15 and 18 are first and second refrigerant supply pipes, 1
7 and 22 are first and second refrigerant channels, and 23 is an injection cylinder. Applicant Tokyo Shibaura Electric Co., Ltd. No. 1 Product No. 2 Drawing 3 Drawing 4 Drawing 5

Claims (1)

[Claims] 1. Great cooling 1. The refrigerant flows from the condenser into the gas-liquid separator, and when the flow path control valve is opened, the refrigerant flows through the refrigerant flow path with a small thermal load. The liquid refrigerant in the gas-liquid separator is returned to the compressor, and an injection pipe is connected to the gas-liquid separator in which the refrigerant flows through the refrigerant flow path with a large thermal load when the path control valve is opened. The front end of the injection pipe that enters the gas-liquid separator is located approximately at the same level as, or below, the end of the refrigerant supply pipe to the refrigerant flow path that is subject to the thermal load. 2. The refrigerating cycle according to claim 1, wherein the gas-liquid separator is integrally formed with the valve case of the flow path control valve.