KR101698756B1 - Device for adjusting refrigerant amount of heat pump system - Google Patents

Device for adjusting refrigerant amount of heat pump system Download PDF

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Publication number
KR101698756B1
KR101698756B1 KR1020150157868A KR20150157868A KR101698756B1 KR 101698756 B1 KR101698756 B1 KR 101698756B1 KR 1020150157868 A KR1020150157868 A KR 1020150157868A KR 20150157868 A KR20150157868 A KR 20150157868A KR 101698756 B1 KR101698756 B1 KR 101698756B1
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KR
South Korea
Prior art keywords
refrigerant
space
pressure
circulating
amount
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KR1020150157868A
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Korean (ko)
Inventor
조천휘
박영찬
이창섭
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(주) 액트
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Priority to KR1020150157868A priority Critical patent/KR101698756B1/en
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Publication of KR101698756B1 publication Critical patent/KR101698756B1/en

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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B13/00—Compression machines, plants or systems, with reversible cycle
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B30/00—Heat pumps
    • F25B30/02—Heat pumps of the compression type
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B39/00—Evaporators; Condensers
    • F25B41/003—
    • F25B41/046—
    • F25B41/062—

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Mechanical Engineering (AREA)
  • Thermal Sciences (AREA)
  • General Engineering & Computer Science (AREA)
  • Air-Conditioning For Vehicles (AREA)

Abstract

Disclosed is a refrigerant amount adjustment device of a heat pump system. According to an aspect of the present invention, the refrigerant amount adjustment device comprises: a pressure adjustment device which makes pressure of a refrigerant in a rear end portion of a condenser be constant; and a tank which can charge or discharge the refrigerant. In the tank, a first separation film for forming a first space, a second separation film for forming a second space, and an elastic member interposed between the first separation film and the second separation film are arranged. A thermo-sensitive refrigerant, injected in the first space, presses the first separation film as the volume of the thermo-sensitive refrigerant is changed in accordance with a temperature of external air. Pressure of a refrigerant, injected in the second space, is maintained to be constant by the pressure adjustment device. Force of a pressure of the thermo-sensitive refrigerant, force of the elastic member, and force of a circulated refrigerant are in an equilibrium state. The amount of the refrigerant injected into the second space is changed as the volume of the thermo-sensitive refrigerant is changed by temperature changes of external air.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a refrigerant amount adjusting device for a heat pump system,

The present invention relates to a device capable of controlling the amount of refrigerant in a heat pump system in conjunction with ambient temperature.

In a general heat pump system, a refrigerant circulation cycle includes a compressor for compressing a refrigerant gas to a condensing pressure in a high-temperature and high-pressure state, a condenser for condensing the refrigerant compressed in the compressor into a liquid state by heat radiation, An expansion valve for expanding the liquid refrigerant condensed at the high temperature and high pressure state condensed in the condenser to the gaseous refrigerant at a low pressure state and an evaporator for evaporating the refrigerant expanded in the expansion valve to deprive the latent heat of evaporation from the outside air, and an evaporator. Such a heat pump system is a system for continuously changing the phase of the refrigerant from the gas to the liquid and from the liquid to the gas during the refrigerant circulation cycle and converting the heating and cooling operation to the four sides, and generates hot water as a heating heat source.

In order to improve the performance of the heat pump system, the efficiency of the compressor must be high, the components constituting the system must be designed to optimize each other, and the appropriate amount of refrigerant must be charged. In particular, when the amount of refrigerant filled in the heat pump system is large or small, the performance of the system may deteriorate and the reliability of the product may deteriorate. Therefore, it is very important to charge the optimal amount of refrigerant into the system.

However, heat pump systems operate in a variety of operating conditions, particularly changes in outdoor temperature affect the performance of the heat pump system. The optimum amount of refrigerant that can provide optimum performance in a heat pump system depends on the ambient temperature. That is, when the outside air temperature is high as in the summer, it needs to be injected in a larger amount than the usual amount of the refrigerant, and when the outside air temperature is low as in winter, it is necessary to reduce the amount of the refrigerant.

Korean Patent Publication No. 2000-0055613

SUMMARY OF THE INVENTION Accordingly, the present invention has been made keeping in mind the above problems occurring in the prior art, and an object of the present invention is to provide a refrigerant amount adjusting device capable of adjusting a refrigerant amount of a heat pump system in conjunction with outside air temperature.

Other objects of the present invention will become more apparent through the embodiments described below.

A refrigerant amount adjusting apparatus according to an aspect of the present invention includes a pressure regulator for keeping a pressure of refrigerant at a rear end of a condenser and a tank capable of charging or discharging refrigerant, A first separating membrane, a second separating membrane forming a second space, and an elastic member interposed between the first separating membrane and the second separating membrane, wherein the thermally-induced refrigerant injected into the first space has a volume change While the refrigerant injected into the second space is maintained at a constant pressure by the pressure regulator and the force due to the pressure of the thermosensitive refrigerant and the force due to the elastic member and the force due to the circulating refrigerant are in equilibrium , The amount of refrigerant injected into the second space changes due to the volume change of the thermosensitive refrigerant in accordance with the change in the ambient temperature.

The refrigerant amount control apparatus according to the present invention may include one or more of the following embodiments. For example, the tank may have a first refrigerant passage in communication with the first space and a circulating refrigerant passage in communication with the second space, and the circulating refrigerant passage may be located between the pressure regulator and the expansion valve.

The circulating refrigerant passage may be provided with a control valve.

The first space may communicate with a sensing tube filled with the thermosensitive refrigerant. And the opening / closing passage may be disposed at the rear end of the evaporator.

The first separation membrane may be a diaphragm, and the second separation membrane may correspond to a piston capable of moving up and down.

An intermediate heat exchanger may be further provided at the downstream end of the pressure regulator.

The present invention can provide a refrigerant amount adjusting device capable of adjusting an amount of refrigerant so as to achieve an optimum efficiency according to the outside air temperature.

1 is a view illustrating a heat pump system to which a refrigerant amount adjusting apparatus according to an embodiment of the present invention is coupled.
2 is a cross-sectional view illustrating a tank of the refrigerant amount adjusting device illustrated in FIG.

BRIEF DESCRIPTION OF THE DRAWINGS The present invention is capable of various modifications and various embodiments, and specific embodiments are illustrated in the drawings and will be described in detail in the detailed description. It is to be understood, however, that the invention is not to be limited to the specific embodiments, but includes all modifications, equivalents, and alternatives falling within the spirit and scope of the invention. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, the present invention will be described in detail with reference to the accompanying drawings.

The terminology used in this application is used only to describe a specific embodiment and is not intended to limit the invention. The singular expressions include plural expressions unless the context clearly dictates otherwise. In the present application, the terms "comprises" or "having" and the like are used to specify that there is a feature, a number, a step, an operation, an element, a component or a combination thereof described in the specification, But do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, or combinations thereof.

The terms first, second, etc. may be used to describe various components, but the components should not be limited by the terms. The terms are used only for the purpose of distinguishing one component from another.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like reference numerals refer to the like elements throughout the specification and claims. The description will be omitted.

1 is a view illustrating a heat pump system 200 coupled with a refrigerant amount control apparatus 100 according to an embodiment of the present invention. Fig.

1 and 2, a refrigerant amount control apparatus 100 according to an embodiment of the present invention is coupled to a heat pump system 200, and includes a circulating refrigerant circulating inside a heat pump system 200, Can be controlled. That is, when the outside air temperature is high as in the summer, the refrigerant charged in the refrigerant amount controller 100 flows into the heat pump system 200 to increase the amount of the circulating refrigerant. When the outside air temperature is low as in winter, A part of the circulating refrigerant flows into the refrigerant amount regulating device 100 from the refrigerant circulation passage 200 to reduce the circulating refrigerant.

As described above, the refrigerant amount control apparatus 100 according to the present embodiment adjusts the circulating refrigerant amount of the heat pump system 200 according to the outside air temperature, thereby achieving optimum cooling and heating efficiency.

The refrigerant amount adjusting apparatus 100 according to the present embodiment includes a pressure regulator 160 for regulating the pressure of the circulating refrigerant at the rear end of the condenser 170 and a pressure regulator 160 disposed at the rear end of the pressure regulator 160 for maintaining the subcooling degree of the circulating refrigerant A sensing tube 185 connected to the tank 110 and having a thermosensitive refrigerant whose volume expands or contracts in accordance with the temperature of the outside air, and a condenser 185 for charging or discharging a part of the refrigerant to increase the amount of circulating refrigerant And a tank (110).

The refrigerant amount adjusting device 100 may be positioned between the rear end of the condenser 170 and the expansion valve 175. When the heat pump system 200 operates in the heating mode, the liquid circulating refrigerant condensed by the condenser 170 flows between the rear end of the condenser 170 and the expansion valve 175, May be filled or discharged into the second space 116 within the tank 110. [ When the circulating refrigerant is filled in the tank 110, the amount of circulating refrigerant in the heat pump system 100 decreases and the amount of circulating refrigerant in the heat pump system 100 increases when discharged from the tank 110 to the outside.

The pressure regulator 160 keeps the pressure of the liquid circulating refrigerant discharged from the condenser 170 constant. Since the pressure of the circulating refrigerant discharged from the condenser 170 varies according to the temperature of the circulating refrigerant discharged from the condenser and is not related to the outside air temperature, the pressure of the circulating refrigerant is kept constant through the pressure regulator 160 So that the refrigerant regulator 100 can be operated correctly according to the ambient temperature.

The pressure of the circulating refrigerant can be variously set by the pressure regulator 160. For example, the pressure can be adjusted by assuming that the temperature of the circulating refrigerant discharged from the condenser 170 is 25 bar at 45 ° C. Therefore, even if the temperature of the circulating refrigerant discharged from the condenser 170 is changed to change the pressure, a predetermined pressure set by the pressure regulator 160 can be applied to the second space 116 of the tank 110 .

An intermediate heat exchanger 178 is provided at the rear end of the pressure regulator 160. In the intermediate heat exchanger 178, the refrigerant liquid filled in the liquid separator 177 and the circulating refrigerant passing through the pressure regulator 160 mutually exchange heat. As a result, the subcooling degree of the circulating refrigerant is maintained, It is possible to prevent the generation of gas (flash gas). A bypass flow path 179 is formed in the intermediate heat exchanger 178.

The liquid separator 177 serves as a storage tank for temporarily storing the oil or liquid refrigerant mixture to prevent the liquid refrigerant from being excessively introduced into the compressor 190, . The liquid separator 177 is connected to the intermediate heat exchanger 178.

The tank 110 has an internal space having a constant volume to receive or discharge a part of the circulating refrigerant. A first separation membrane 130 that forms a first space 112 and a second separation membrane 140 that forms a second space 116 are formed in the tank 110. The first separation membrane 130 and the second separation membrane 130, And an elastic member 150 interposed between the separator 140.

The first separation membrane 130 forms the first space 112 and may correspond to a diaphragm connected to the inner surface of the tank 110. The shape of the first separator 130 is changed by the change in the volume of the thermo-sensitive refrigerant injected into the first space 112. Accordingly, the force due to the volume change of the thermo-sensitive refrigerant can be transmitted to the second space 116 . That is, when the volume of the thermosensitive refrigerant expands due to the rise of the ambient temperature, the first separator 130 rises in FIGS. 1 and 2 while the volume of the first space 112 increases. Accordingly, the force due to the expansion of the thermosensitive refrigerant can be transmitted to the second space 116. When the volume of the thermosensitive refrigerant contracts due to the fall of the ambient temperature, the volume of the first space 112 decreases and the pressure of the refrigerant introduced into the second space 116 causes the pressure of the first space 112, .

The first separation membrane 130 may correspond to a piston such as the second separation membrane 140 in addition to the diaphragm. The present invention is not limited by the shape and the kind of the first separation membrane 130 and the like.

 The first space 112 is separated from the buffer space 135 by the first separation membrane 130. The first space 112 communicates with the pressure sensing cylinder 185 by the first refrigerant passage 114.

The sensing chamber 185 is filled with a thermosensitive coolant and the sensing chamber 185 communicates with the first space 112 by the first coolant passage 114. The temperature sensing tube 185 may be disposed at the rear end of the evaporator 180, for example, to sense the temperature of the outside air. The temperature of the ambient temperature changes to shrink or expand the thermosensitive coolant injected into the sensing tube 185, which causes the volume of the first space 112 to shrink or expand.

The overflow tube 185 may be interlocked with the expansion valve 175 or may be provided separately from the expansion valve 175. The present invention is not limited by the position and structure of the wind-up tube 185.

The thermally sensitive refrigerant may correspond to the same refrigerant as the circulating refrigerant of the heat pump system 200 or other refrigerant. As the temperature-sensitive refrigerant, a gas (refrigerant) of a type having a large volume change according to the change of ambient temperature can be used.

The space between the first separator 130 and the second separator 140 corresponds to the cushioning space 135 corresponding to the empty space in which the thermosensitive refrigerant or the circulating refrigerant is not charged. The buffering space 135 is provided with an elastic member 150. The elastic member 150 has a constant elastic modulus and acts to exert an elastic force in the direction of the second space 116. 2, the force F1 due to the pressure of the thermosensitive coolant injected into the first space 112 and the force F2 due to the elastic member 150 are generated by the refrigerant injected into the second space 116 The force (F3) becomes parallel with the following equation.

F1 + F2 = F3

The elastic member 150 may correspond to a spring, particularly, a coil spring. One end of the coil spring may be in contact with the first separator 130 and the other end may be in contact with the second separator 140. The amount of refrigerant can be easily adjusted by suitably selecting the spring constant k of the coil spring.

The coolant amount adjusting device 100 according to the present embodiment is illustrated as having one coil spring as the elastic member 150. However, the present invention is not limited by the type, the shape, and the number of the elastic members 150 .

The second separation membrane 140 forms a second space 116 so that the second space 116 is separated from the buffer space 135 while contacting the inner surface of the tank 110. The second separation membrane 140 is lowered or raised in accordance with the volume expansion or contraction of the thermosensitive refrigerant injected into the first space 112, thereby adjusting the amount of circulating refrigerant in the heat pump system 200. That is, when the thermosensitive refrigerant expands due to the increase of the ambient temperature, the second separation membrane 140 rises due to an increase in the volume of the first space 112 The refrigerant is introduced into the heat pump system 200 through the circulating refrigerant passage 118. When the thermally sensitive refrigerant contracts due to the fall of the ambient temperature, the second separator 140 descends due to the decrease in the volume of the first space 112 (i.e., decreases F1) The amount of circulating refrigerant in the heat pump system 200 is reduced.

A retainer 142 is coupled to the periphery of the second separation membrane 140. The retainer 142 makes contact with the inner surface of the tank 110 so as to move up and down and prevent the refrigerant located in the second space 116 from flowing into the buffer space 135.

The second space 116 is connected to the liquid refrigerant pipe 165 by the circulating refrigerant passage 118. Therefore, the circulating refrigerant circulating in the liquid refrigerant pipe 165 and the refrigerant filled in the second space 116 have the same pressure. The circulating refrigerant passage 118 is provided with a control valve 120. The control valve 120 can be controlled to be opened or closed in a state where the amount of refrigerant is not required to be adjusted.

Hereinafter, the control of the refrigerant amount in the refrigerant amount control apparatus 100 according to the present embodiment will be described.

First, the reference outdoor temperature and the pressure of the circulating refrigerant can be determined. For example, the pressure of the circulating refrigerant can be adjusted to 25 bar by the pressure regulator 160 at an outside temperature of 7 ° C. At this time, the force F1 (= p1A1, A1 is the width of the first separation membrane 130) and the force F2 (= kx, k spring) of the elastic member 150 due to the pressure p1 of the thermally- (= P2A2, A2 is the width of the second separation membrane 140) due to the pressure p2 of the refrigerant filled in the second space 116 (which is the same as the pressure of the circulating refrigerant) .

At this time, when the volume of the thermo-sensitive refrigerant injected into the first space 112 increases due to the rise of the outside air temperature, F 1 and F 3 do not change while F 1 increases due to the pressure increase in the first space 112. As a result, the first separator 130 rises and the volume of the second space 116 decreases, and the refrigerant filled in the second space 116 is discharged to the heat pump system 200 to be circulated refrigerant. When the volume of the first space 112 increases due to the rise of the first separation membrane 130, the pressure of the thermo-sensitive refrigerant is decreased, whereby the equilibrium of F1, F2 and F3 is performed again.

When the volume of the thermally-induced refrigerant injected into the first space 112 decreases due to the fall of the outside air temperature, F 1 and F 3 do not change while F 1 decreases due to the pressure reduction inside the first space 112. The circulation refrigerant of the heat pump system 200 flows into the second space 116 while the first and second separation membranes 130 and 140 descend and the volume of the second space 116 increases. P2 decreases due to an increase in the volume of the second space 116 due to the descent of the second separation membrane 140, which causes the equilibrium of F1 and F2 and F3 to be re-established.

The refrigerant amount control apparatus 100 according to the present embodiment is characterized in that the amount of circulating refrigerant in the heat pump system 200 can be increased or decreased according to the outside air temperature. That is, the refrigerant amount control apparatus 100 according to the present embodiment increases the amount of refrigerant when the outside air temperature is high as in the summer, and decreases the amount of the refrigerant when the outside air temperature is low as in the winter time. This allows the heat pump system 200 to exhibit optimal efficiency.

In addition, the refrigerant amount control apparatus 100 according to the present embodiment is characterized by a simple structure. That is, since the refrigerant filled in the tank 110 is charged or discharged using the change in the volume of the thermosensitive refrigerant injected into the pressure sensing cylinder 185, the amount of refrigerant can be adjusted easily while the configuration is simple.

While the present invention has been described with reference to exemplary embodiments, it is to be understood that the invention is not limited to the disclosed exemplary embodiments, but, on the contrary, is intended to cover various modifications and equivalent arrangements included within the spirit and scope of the appended claims. It will be understood that the invention may be varied and varied without departing from the scope of the invention.

100: Refrigerant regulator
110: tank
112: First space
114: first refrigerant passage
116: Second space
118: circulating coolant passage
130: first separator
135: Buffer space
140: second separator
150: elastic member
160: Pressure regulator
165: liquid refrigerant tube
170: condenser
175: Expansion valve
178: intermediate heat exchanger
185: Whole surface
200: Heat pump system

Claims (7)

A pressure regulator for keeping the pressure of the circulating refrigerant constant at the rear end of the condenser; And
And a tank capable of charging or discharging the circulating refrigerant discharged from the pressure regulator,
A first separation membrane forming a first space in the tank, a second separation membrane forming a second space, and an elastic member interposed between the first separation membrane and the second separation membrane,
Wherein the thermostatic refrigerant injected into the first space pressurizes the first separator while changing its volume in accordance with the ambient temperature and the circulating refrigerant injected into the second space maintains a constant pressure by the pressure regulator,
The force due to the pressure of the thermosensitive refrigerant, the force due to the elastic member, and the force due to the circulating refrigerant form an equilibrium,
Wherein the amount of the circulating refrigerant injected into the second space is changed by a volume change of the thermosensitive refrigerant in accordance with a change in ambient temperature. The method according to claim 1,
Wherein the tank has a first refrigerant passage communicated with the first space and a circulating refrigerant passage communicated with the second space,
Wherein the circulating coolant passage is located between the pressure regulator and the expansion valve. 3. The method of claim 2,
Wherein the circulating refrigerant passage is provided with a control valve. The method according to claim 1,
Wherein the first space is communicated with a sensing cylinder filled with the thermosensitive refrigerant. 5. The method of claim 4,
And the refrigerant flow amount is disposed at a rear end of the evaporator. The method according to claim 1,
Wherein the first separator is a diaphragm, and the second separator is a piston capable of moving up and down. The method according to claim 1,
And an intermediate heat exchanger is additionally provided at a downstream end of the pressure regulator.
KR1020150157868A 2015-11-11 2015-11-11 Device for adjusting refrigerant amount of heat pump system KR101698756B1 (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR102528077B1 (en) * 2022-10-04 2023-05-04 강원경 Air conditioning and dehumidification system using heat pump

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0413068A (en) * 1990-04-27 1992-01-17 Mitsubishi Heavy Ind Ltd Automatic expansion valve
KR100222851B1 (en) * 1995-12-29 1999-10-01 정몽규 Refrigerant automatic drain and filling device and its method of car cooling device
KR100255924B1 (en) * 1996-12-17 2000-05-01 정몽규 Auto-control device for refrigerant amount of car air-conditioner
KR20000055613A (en) 1999-02-09 2000-09-15 구자홍 Air conditioner
JP4140422B2 (en) * 2003-03-31 2008-08-27 三菱電機株式会社 Refrigerating apparatus update method and refrigeration apparatus

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0413068A (en) * 1990-04-27 1992-01-17 Mitsubishi Heavy Ind Ltd Automatic expansion valve
KR100222851B1 (en) * 1995-12-29 1999-10-01 정몽규 Refrigerant automatic drain and filling device and its method of car cooling device
KR100255924B1 (en) * 1996-12-17 2000-05-01 정몽규 Auto-control device for refrigerant amount of car air-conditioner
KR20000055613A (en) 1999-02-09 2000-09-15 구자홍 Air conditioner
JP4140422B2 (en) * 2003-03-31 2008-08-27 三菱電機株式会社 Refrigerating apparatus update method and refrigeration apparatus

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR102528077B1 (en) * 2022-10-04 2023-05-04 강원경 Air conditioning and dehumidification system using heat pump

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