JPH0350453A - Freezing cycle - Google Patents

Abstract

PURPOSE:To enhance the freezing cycle performance in simple structure by equipping a storage chamber which is provided in a liquid receiver and to which liquid refrigerant separated by the liquid receiver is guided to be filled therein; a heating means for heating the liquid refrigerant in the storage chamber; and a control means for heating the liquid refrigerant in the storage chamber in accordance with cycle performance. CONSTITUTION:A second chamber 9 (storage chamber) wherein liquid refrigerant separated by a liquid receiver 3 is filled is provided in the liquid receiver 3, and a branching tube 14 and a solenoid opening/closing valve 16 (heating means) are also provided for heating the liquid refrigerant in the second chamber 9. When high cycle performance is required, the solenoid opening/closing valve 16 is allowed to open by a controller 25 so that the liquid refrigerant in the second chamber 9 is heated. When performance is required for a high load, the solenoid opening/closing valve 16 provided in the branching tube 14 is opened, and the refrigerant with many low- boiling components circulates in order through a compressor 1, a condenser 2, a first chamber 8 in the liquid receiver 3, an expansion valve 4 and an evaporator 5. On the contrary, the refrigerant with high-boiling components is condensed and stays in the second chamber 9 in the liquid receiver 3, whereby a low temperature can be obtained.

Description

[Detailed description of the invention] [Industrial usage] This invention relates to frozen recycling.

[Prior Art] Conventionally, in a refrigeration cycle in which a plurality of components having different boiling points are sealed, the desired recycling capacity has been achieved by controlling the ratio of the components within the recycle. In other words, for example, as shown in Japanese Unexamined Patent Publication No. 61-66054, heat bombs mix low-boiling point components with the main refrigerant during heating, while cooling samurai separates and stores low-boiling point components as the main refrigerant. This makes it possible to both pump up heat from the outside air in the winter and avoid power increases due to low boiling point components in the summer.

[Problem to be Solved by the Invention J] However, a rectifier is provided separately for the separation, and the cost is 1 to 100% high due to the large number of valves.

An object of the present invention is to provide a refrigeration cycle that has a simple structure and can improve ionic performance.

[A Thousand Steps to Solve the Problems] The present invention provides a refrigerated recycling system in which a compressor, a condenser, a liquid receiver, and an evaporator are connected in order, and a plurality of components having different boiling points are ring-circulated. a storage chamber provided in the vessel, into which the liquid refrigerant separated by the liquid receiver is guided and filled; a heating means for heating the liquid refrigerant in the storage chamber; The gist of the invention is a freezing cycle including a control means for controlling the means and heating the liquid refrigerant in the storage chamber.

[Operation] Depending on the cycle capacity, the control means controls the heating means to heat the liquid refrigerant in the storage chamber. As a result, the concentration of high boiling point components of the liquid refrigerant in the storage chamber increases, and the amount of low boiling point components that are circulated increases.

[Example] Hereinafter, an example in which the present invention is embodied in an air conditioner for an automobile will be described with reference to the drawings.

As shown in FIG. 1, a compressor 1, a condenser 2, a liquid receiver 3, an expansion valve 4, and an evaporator 5 are connected in this order to constitute a refrigerated Nicle. There are two types of refrigerated recycle with different boiling points.
The component refrigerants are sealed, making it a so-called mixed refrigerant recycle.

As shown in FIG. 2, the liquid receiver 3 is provided with a partition wall 7 made of a heat insulating material in the casing 6.
A first chamber 8 and a second chamber 9 serving as a storage chamber are partitioned. A large number of small holes 10 are formed in the bottom of the partition wall 7, and a large number of small holes 11 are formed in the top surface of the partition wall 7. Both chambers 8 and 9 communicate with each other through the small holes 10 and 11.

A pipe 12 connected to the condenser 2 is disposed on the top surface of the first chamber 8, and a pipe 13 connected to the expansion valve 4 is disposed near the bottom surface of the first chamber 8.

A branch pipe 14 is connected to the bottom of the second chamber 9 of the liquid receiver 3, and the other end of the branch pipe 14 is connected between the compressor 1 and the condenser 2. A sintered metal 15 is inserted into the inlet of the second chamber 9 of the liquid receiver 3 in the branch pipe 14 .

Further, the branch pipe 14 is provided with an electromagnetic on-off valve 16. Incidentally, a diaphragm member may be provided instead of the sintered metal 15.

In this embodiment, the heating means is composed of the branch pipe 14 and the electromagnetic on-off valve 16.

Further, as shown in FIG. 1, a blower 1B is installed in the middle of the air passage 17 of the air conditioner, and when the blower 18 is driven, inside air or outside air is sent into the vehicle interior through the air passage 17. ing.

In addition, an evaporator 5 and a heater core 19 are arranged in the air passage 17, and the evaporator 5 is adjusted depending on the opening degree of the air mix damper 20.
The amount of air that enters the heater coil 71 and the amount of air that does not enter the heater taco 7 is adjusted so that both airs are mixed and the temperature is controlled to a predetermined temperature.

The opening degree of the air mix damper 20 is adjusted by driving a servo motor 21. In addition, the indoor temperature sensor 22
detects the temperature inside the vehicle, the outside air temperature sensor 23 detects the temperature of the outside air, and the solar radiation sensor 24 detects the solar radiation source. Detection signals from each sensor 22, 23, and 24 are sent to a controller 25 as a control means. The controller 25 controls the servo motor 2 based on these signals.
1 and also controls the opening and closing of the electromagnetic on-off valve 16.

Next, the operation of the automobile air conditioner constructed in this manner will be explained.

Controller 1 to roller 25 have a guide temperature sensor 22, outside temperature 1 meal hint 23, day! The opening degree of the air mix damper 20 is adjusted based on the signal from the high temperature sensor 24, but if the temperature of the blown air does not need to be lowered too much, the electromagnetic valve 16 is closed.

As a result, two refrigerant components having different boiling points are circulated in the refrigeration cycle. That is, the compressor 1 sends a high-temperature, high-pressure gas refrigerant to the condenser 2, and the condenser 2 cools and liquefies the high-temperature, high-pressure gas refrigerant into the first chamber 8 of the liquid receiver 3.
A liquid refrigerant is stored in the evaporator 5, and the high-pressure liquid refrigerant is turned into a low-pressure, low-temperature mist by an expansion valve 4, and evaporated by an evaporator 5. At this time, the gas refrigerant between the compressor 1 and the condenser 2 has a predetermined degree of superheat. The air generated by the blower 18 undergoes heat exchange with the evaporator 5 and is blown into the vehicle interior through the heater 19.

In addition, when the cooling load is high during cooling, the controller 25 controls the opening degree of the air mix damper 20 to position a in FIG. It is blown directly into the vehicle interior as cold air.

When the air mix damper 20 is at position a when the cooling load is high, the controller 25 opens the electromagnetic on-off valve 16. When the electromagnetic on-off valve 16 enters the open state, the superheated refrigerant at the outlet of the compressor 1 is introduced into the bottom of the second chamber 9 of the liquid receiver 3 through the branch pipe 14. The liquid refrigerant in the second chamber 9 of the separator 3 [, J, sintered metal (
Or, it is heated by the degree of superheating of the gas refrigerant that has become bubbles by the throttle 15, and the low boiling point components are vaporized and exit from the small hole 11 at the top to the 1Nicle for circulation.

As a result, in the second chamber 9 of the liquid receiver 3, the refrigerant having a high boiling point component becomes concentrated and constantly stagnates therein.

In this way, a low evaporation temperature can be obtained by increasing the refrigerant mixture ratio of refrigerant recycle to include low boiling point components. At this time, at the same time as the cooling load decreases, the mixture ratio is changed so that the high point component is also circulated through the lnicle, thereby suppressing an increase in the power applied to the compressor 1.

In this way, in this embodiment, in a refrigeration cycle in which two component refrigerants having different boiling points are circulated, the liquid receiver 3 is provided with a second chamber in which the liquid refrigerant separated by the receiver 3 is filled. 9(
When a high cycle capacity is required by the controller 25, a branch pipe 14 and an electromagnetic shut-off valve 16 (heating means) are installed to heat the liquid refrigerant in the second chamber 9. The liquid refrigerant in the second chamber 9 is heated by opening the solenoid valve 16.

As a result, during high loads that require high capacity, the electromagnetic on-off valve 16 provided in the branch pipe 14 is activated, and the compressor 1, condenser 2
The refrigerant containing many low boiling point components is circulated in the first chamber 8 of the liquid receiver 3, the expansion valve 4, and the evaporator 5 in this order, and conversely, the refrigerant containing high boiling point components is circulated in the second chamber 9 of the liquid receiver 3. Because it concentrates and stays there, a low temperature is obtained. On the other hand, when the load decreases, the electromagnetic on-off valve 16 is closed and the component #t function can be stopped, and the compression chamber 1, the condenser 2, the first chamber 8 of the liquid receiver 3, and the expansion valve 4 Since the refrigerant in the evaporator 5 circulates at a component ratio equal to the mixing ratio of the low and high boiling point refrigerants sealed in the recycle, capacity can be saved and the power required for compression by the compressor 1 can be reduced. . Therefore, the second chamber 9 is provided in the liquid receiver 3, and the first
Since only one valve (electromagnetic on-off valve 16) is required, the overall structure can be simplified and costs can be reduced.

Furthermore, during high loads, the heat for heating the liquid refrigerant in the second chamber 9 of the liquid receiver 3 is originally the degree of superheating of the gas refrigerant between the compressor 1 and the condenser 2, so There is no reduction in efficiency.

Further, a branch pipe 1 provided at the bottom of the second chamber 9 of the liquid receiver 3
Since we used sintered metal 15 (or diaphragm) for the population part of 4,
The superheated bubbles rising above the second chamber 9 of the liquid receiver 3 become finer and can easily exchange heat with the liquid refrigerant in the second chamber 9.

Further, in the process of concentrating the liquid refrigerant in the second chamber 9 to high boiling point components, the circulating refrigerant in the first chamber 8 enters the second chamber 9 through the small hole 10 in the partition wall 7 so as not to be reduced. By adjusting the diameter and number of both this small hole 10 and the small hole 11 for gas venting in the upper part, the liquid refrigerant in the second chamber 9 can flow inside the second chamber 9 in a state containing bubbles. We can create a design that satisfies your needs.

Note that the present invention is not limited to the above-mentioned embodiment. For example, in the above-mentioned embodiment, the degree of superheat between the compressor 1 and the condenser 2 is used as a heat source to the second chamber 9 of the liquid receiver 3. However, as shown in FIG. 3, a heating element 26 such as a nichrome wire is installed in the second chamber 9 as a heating means, and the power source 27 and the heating element 26 are connected through the contact 2B. Connect. Then, by closing the contact point 28 under high load (5), the heating element 26 is caused to generate heat. By doing so, the branch pipe 14 can be omitted and the system becomes simple.

Further, as shown in FIG. 4, the present invention may be applied to a heat bomb. In the figure, 29 is a four-way valve, 30 to 33 are check valves, 34 is an outdoor heat exchanger, and 35 is an indoor heat exchanger.

Then, during heating, when the heating load is large, the electromagnetic on-off valve 16 may be opened to the ↑ state to increase the low boiling point components, and after the heating load has decreased, the low and high boiling point components may be circulated.

In general, the present invention is not limited to separating the components of a mixed refrigerant, but can also be applied to, for example, a refrigeration cycle in which a conventional single-component refrigerant (for example, R12) is inserted. Generally, oil from the refrigerating machine is sealed in the refrigeration cycle for the purpose of lubricating the compressor, and is dissolved in the refrigerant to circulate the recycle. However, since oil has a high boiling point, the boiling point increases when the refrigerant and oil are mixed, especially during cooling. This increases vapor humidity and reduces cooling capacity. Listen to the 78 magnetic opening/closing 5t16 of the branch pipe 14 (when you hear it, the second
Since the refrigerant with a high boiling point is concentrated into the chamber 9 of the recycle, the refrigerant circulating in the recycle (for example, R12) contains almost no effluent, so it becomes a high-purity refrigerant and prevents the above-mentioned decrease in refrigerant capacity. It can be prevented.

The load state may also be detected using the following information: the higher the load, the greater the refrigerant flow loss, the higher the refrigerant pressure, the expansion valve's level, the speed of the blower that produces the orange cooling air, etc.

[Effects of the Invention] As described in detail above, the present invention provides a significant effect of improving performance with a simple structure.

[Brief explanation of drawings]

Figure 1 is a dimensional drawing of a vehicle air conditioning system according to an embodiment, Figure 2 is a diagram showing a liquid receiver, Figure 3 is a diagram showing another example of a liquid receiver, and Figure 4 is a diagram showing a liquid receiver of another example.
The figure shows another example of a frozen cycle. 1 is a compressor, 2 is a condenser, 3 is a liquid receiver, 5 is an evaporator, 9 is a second chamber as a storage chamber, 14 is a branch pipe constituting a heating means, and 16 is a heating means. Solenoid on-off valve, 2
5 is a controller as a control means.

Claims (1)

[Claims] 1. A compressor, a condenser, a liquid receiver, and an evaporator are connected in order,
In a refrigeration cycle in which a plurality of components having different boiling points are circulated, a storage chamber is provided in the liquid receiver and filled with a liquid refrigerant separated by the liquid receiver, and the liquid refrigerant in the storage chamber is heated. A refrigeration cycle comprising: a heating means for heating the liquid refrigerant in the storage chamber; and a control means for heating the liquid refrigerant in the storage chamber by controlling the heating means according to cycle capacity.