WO2011070917A1 - Climatiseur et procédé de détection de la quantité de fluide frigorigène dans le climatiseur - Google Patents

Climatiseur et procédé de détection de la quantité de fluide frigorigène dans le climatiseur Download PDF

Info

Publication number
WO2011070917A1
WO2011070917A1 PCT/JP2010/071064 JP2010071064W WO2011070917A1 WO 2011070917 A1 WO2011070917 A1 WO 2011070917A1 JP 2010071064 W JP2010071064 W JP 2010071064W WO 2011070917 A1 WO2011070917 A1 WO 2011070917A1
Authority
WO
WIPO (PCT)
Prior art keywords
refrigerant
pressure
temperature
receiver
air conditioner
Prior art date
Application number
PCT/JP2010/071064
Other languages
English (en)
Japanese (ja)
Inventor
隆博 加藤
篤 塩谷
Original Assignee
三菱重工業株式会社
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by 三菱重工業株式会社 filed Critical 三菱重工業株式会社
Priority to CN201080030950.9A priority Critical patent/CN102472538B/zh
Priority to EP10835839.1A priority patent/EP2511629A4/fr
Publication of WO2011070917A1 publication Critical patent/WO2011070917A1/fr

Links

Images

Classifications

    • 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
    • F25B45/00—Arrangements for charging or discharging refrigerant
    • 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
    • F25B2700/00—Sensing or detecting of parameters; Sensors therefor
    • F25B2700/04—Refrigerant level
    • 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
    • F25B2700/00—Sensing or detecting of parameters; Sensors therefor
    • F25B2700/21—Temperatures

Definitions

  • the present invention relates to an air conditioner that can always be filled with an optimum amount of refrigerant at the time of installation, and a refrigerant amount detection method for the air conditioner.
  • a multi-type air conditioner used for air conditioning of buildings and the like includes a compressor, a four-way switching valve, an outdoor heat exchanger, an expansion valve for heating, a receiver and an outdoor fan, an indoor heat exchanger, A plurality of indoor units equipped with a cooling expansion valve, an indoor fan, and the like are connected locally via a gas refrigerant pipe and a liquid refrigerant pipe.
  • a pipe length that connects between the outdoor unit and the indoor unit when the outdoor unit is preliminarily filled with a predetermined amount of refrigerant and the air conditioner is installed in the field and then trial run is performed.
  • an insufficient amount of refrigerant is additionally charged according to the number of indoor units connected.
  • the amount of refrigerant to be added is always stored in the receiver in the refrigerant circuit during the refrigerant charging operation.
  • a liquid level detection circuit is provided for detecting that the incoming liquid refrigerant has reached a predetermined liquid level, and the liquid level detection circuit detects that the liquid refrigerant of the predetermined liquid level has accumulated in the receiver.
  • a bypass circuit is connected to a compressor suction side from a predetermined height position of a receiver, and an on-off valve, a pressure reducing mechanism, and a temperature detection unit are provided in the bypass circuit.
  • the technique disclosed in Patent Document 2 is provided with an on-off valve, a pressure reducing mechanism, a heating unit, and a temperature detection unit in the bypass circuit, and when the saturated gas refrigerant is taken out from the receiver to the bypass circuit; When saturated liquid refrigerant is taken out, measure the refrigerant temperature after depressurization, and determine the amount of refrigerant by detecting that the liquid refrigerant of the predetermined liquid level has accumulated in the receiver from the temperature difference It is what you do.
  • JP 2002-350014 A Japanese Patent No. 3719246
  • the one disclosed in Patent Document 2 is provided with a heating unit that heats the refrigerant decompressed by the decompression mechanism in the liquid level detection circuit, and the refrigerant taken out from the receiver is in a gas state
  • the temperature rise due to heating is large, and in the liquid state, the heat energy from heating is consumed as latent heat of evaporation and the temperature rise is small, so that a sufficient temperature difference can be secured to improve detection accuracy. It is a thing.
  • it is indispensable to install a heating unit in the liquid level detection circuit there is a problem that the configuration becomes complicated.
  • the present invention has been made in view of such circumstances, and it is possible to always detect the refrigerant charging amount with high accuracy without providing a heating unit in the liquid level detection circuit, and the refrigerant amount of the air conditioner.
  • An object is to provide a detection method.
  • the air conditioner and the refrigerant amount detection method for the air conditioner of the present invention employ the following means. That is, the air conditioner according to the first aspect of the present invention includes an outdoor unit having a compressor, an outdoor heat exchanger, a heating expansion valve, a receiver for storing liquid refrigerant, and the like, an indoor heat exchanger, and a cooling expansion.
  • an air conditioner that connects an indoor unit having a valve or the like with a gas refrigerant pipe and a liquid refrigerant pipe to form a closed-cycle refrigerant circuit, the predetermined height position of the receiver and the suction side of the compressor
  • a liquid level detection circuit provided with an on-off valve and a pressure reduction mechanism in a bypass circuit connecting between them, a temperature detection unit for detecting the temperature of the refrigerant depressurized by the pressure reduction mechanism flowing in the liquid level detection circuit, and in the receiver
  • the intermediate pressure is controlled to a pressure at which the superheat degree is 5 deg or more of the saturated gas temperature with a low pressure, and the slope of the saturated gas line in the pressure-enthalpy diagram is in a region that rises to the right.
  • detection By detecting the temperature of the refrigerant taken out for the road by the temperature detecting unit, and a, a refrigerant amount detecting unit determines refrigerant charge based on temperature.
  • a liquid level detection circuit in which an on-off valve and a pressure reducing mechanism are provided in a bypass circuit that connects between a predetermined height position of the receiver and the suction side of the compressor, and a liquid level detection circuit
  • a temperature detection unit for detecting the temperature of the refrigerant decompressed by the decompression mechanism flowing through the intermediate pressure in the receiver, and the saturation gas line of the pressure-enthalpy diagram with a superheat degree of 5 deg.
  • the pressure of the refrigerant is controlled to a pressure that rises to the right, and the temperature of the refrigerant taken out from the receiver to the liquid level detection circuit is detected by the temperature detection unit, so that the refrigerant filling amount is determined based on the temperature.
  • a refrigerant amount detection unit that performs an intermediate pressure in which the degree of superheat is not less than 5 deg.
  • the low-pressure saturated gas temperature and the slope of the saturated gas line in the pressure-enthalpy diagram is an upward-sloping region.
  • the refrigerant charging amount can be detected with high accuracy by ensuring a sufficient temperature difference without being influenced by the refrigerant discharge side pressure (high pressure) and without providing the refrigerant heating section. It is possible to stably operate the air conditioner by filling the optimal amount of refrigerant without any shortage.
  • the refrigerant amount detection unit includes an intermediate pressure sensor, a temperature sensor that detects a refrigerant temperature taken out by the liquid level detection circuit, Alternatively, the intermediate pressure is detected from a detected value from a high-pressure sensor and a temperature sensor that detects the degree of refrigerant supercooling at the outlet of the outdoor heat exchanger or a converted value thereof, and the rotational speed of the compressor is applied to the outdoor heat exchanger.
  • the intermediate pressure in the receiver is controlled to the pressure by controlling the rotational speed of an outdoor fan that ventilates the outside air, the opening degree of the expansion valve for heating, or the like.
  • the refrigerant amount detection unit detects the refrigerant temperature taken out by the intermediate pressure sensor, the liquid level detection circuit, or the refrigerant supercooling at the outlet of the high pressure sensor and the outdoor heat exchanger.
  • the intermediate pressure is detected from the detected value from the temperature sensor, etc. that detects the degree or the converted value, and the rotational speed of the compressor, the rotational speed of the outdoor fan that ventilates the outdoor air to the outdoor heat exchanger, or the opening of the heating expansion valve Etc., and the intermediate pressure in the receiver is controlled to the above pressure. Therefore, the intermediate pressure in the receiver is changed to the rotational speed of the compressor, the outdoor fan that ventilates the outdoor air to the outdoor heat exchanger.
  • the superheat degree is softer than 5 deg of the saturated gas temperature at low pressure, and the slope of the saturated gas line in the pressure-enthalpy diagram is on the right For intermediate pressure to be the rising area Gosuru can. Therefore, it is possible to accurately detect the refrigerant filling amount by detecting the refrigerant temperature after decompression by the liquid level detection circuit without adding a refrigerant heating unit in hardware, and to fill the optimum amount of refrigerant without excess or deficiency. Can do.
  • the air conditioner according to the first aspect of the present invention introduces hot gas discharged from the compressor between the discharge side of the compressor and the receiver in any of the air conditioners described above. And the hot gas bypass circuit for raising the intermediate pressure in the said receiver to the said pressure is provided.
  • the hot gas for introducing the hot gas discharged from the compressor between the discharge side of the compressor and the receiver to raise the intermediate pressure in the receiver to the above pressure. Since a bypass circuit is provided, for example, even when the ambient pressure in the receiver does not rise to the above pressure under low ambient temperature conditions, a part of the hot gas is passed to the receiver via the hot gas bypass circuit. By introducing, the intermediate pressure can be controlled to the above pressure. Therefore, the refrigerant filling amount can be accurately detected even under a low outside air temperature condition, and the optimum amount of refrigerant can be filled. In addition, this makes it possible to easily increase the pressure even under a low outside air temperature condition, and can be effectively applied to high pressure control or the like during cooling at a low outside air temperature.
  • the refrigerant amount detection method for an air conditioner includes an outdoor unit having a compressor, an outdoor heat exchanger, a heating expansion valve, a receiver storing liquid refrigerant, and the like, and indoor heat exchange.
  • the refrigerant amount detection method of the air conditioner that connects the indoor unit having an air conditioner, an expansion valve for cooling, etc. with a gas refrigerant pipe and a liquid refrigerant pipe, and constitutes a closed cycle refrigerant circuit
  • the intermediate pressure in the receiver is controlled to a pressure at which the superheat degree is at least 5 deg of the saturated gas temperature with a low pressure, and the slope of the saturated gas line in the pressure-enthalpy diagram rises to the right. From the predetermined height position of the receiver to a liquid level detecting circuit connected to the compressor suction side, and detecting the temperature of the refrigerant decompressed to a low pressure state in the liquid level detecting circuit, Determine.
  • the intermediate pressure of the refrigerant in the receiver is equal to or greater than 5 deg. Of the saturated gas temperature with a superheat degree of low pressure, and the saturated gas line of the pressure-enthalpy diagram.
  • the pressure is controlled so that the slope becomes an upwardly rising region, and the intermediate-pressure refrigerant is taken out from the predetermined height position of the receiver to the liquid level detection circuit connected to the compressor suction side, and the low pressure in the liquid level detection circuit Since the refrigerant charging amount is determined by detecting the temperature of the refrigerant whose pressure has been reduced to the state, the degree of superheat is not less than 5 deg.
  • the refrigerant temperature after decompression is detected when the saturated gas refrigerant is taken out from the receiver controlled in the intermediate pressure where the inclination is an area where the inclination rises to the right and when the saturated liquid refrigerant is taken out, respectively.
  • the temperature difference It is possible to detect that the accumulated predetermined liquid level of the liquid refrigerant in Luo the receiver. Therefore, the refrigerant filling amount can be detected with high accuracy by ensuring the temperature difference sufficiently without being influenced by the discharge pressure (high pressure) of the refrigerant and without providing a portion for heating the refrigerant. It is possible to fill the air conditioner with an optimal amount of refrigerant without excess or deficiency.
  • the degree of superheat is not less than 5 deg of the low pressure saturated gas temperature, and the slope of the saturated gas line in the pressure-enthalpy diagram rises to the right.
  • the saturated gas refrigerant is taken out from the receiver controlled to the intermediate pressure that becomes the region of the above and when the saturated liquid refrigerant is taken out, the refrigerant temperature after depressurization is detected, and the difference in temperature is detected in the receiver. Since it is possible to detect that the liquid refrigerant of a predetermined liquid level has accumulated, the above temperature difference is sufficiently ensured without being influenced by the refrigerant discharge side pressure and without providing a refrigerant heating section. Thus, the refrigerant charge amount can be detected with high accuracy, and the optimum amount of refrigerant can be charged without excess or deficiency, and the air conditioner can be operated stably.
  • the air conditioner shown in FIG. 1 it is a pressure-enthalpy diagram when the intermediate pressure in the receiver is set to the vicinity of the maximum enthalpy with a saturated gas line by the intermediate pressure control.
  • FIG. 1 shows a refrigerant circuit diagram of an air conditioner according to the first embodiment of the present invention.
  • the air conditioner 1 is a multi-type air conditioner that is applied to air conditioning of buildings and the like, and includes an outdoor unit 2 and a plurality of indoor units 3 connected in parallel to each other (FIG. 1 shows only one unit). It is composed of).
  • a compressor 10 that compresses the refrigerant, a four-way switching valve 11 that switches the circulation direction of the refrigerant, an outdoor heat exchanger 12 that exchanges heat between the outside air and the refrigerant, and the outside air are passed through the outdoor heat exchanger 12.
  • An outdoor fan 13 for heating, an electric expansion valve for heating (heating expansion valve) 14, a receiver 15 for accumulating condensed liquid refrigerant, and the like are disposed, and a compressor 10, a four-way switching valve 11, an outdoor heat exchanger 12,
  • the outdoor refrigerant circuit 17 is configured by sequentially connecting the heating electric expansion valve 14 and the receiver 15 via the refrigerant pipe 16.
  • an indoor heat exchanger 20 Inside the indoor unit 3, an indoor heat exchanger 20, an indoor fan 21 that circulates indoor air through the indoor heat exchanger 20, a cooling electric expansion valve (cooling expansion valve) 22, and the like are disposed.
  • the indoor unit 3 and the outdoor unit 2 are connected via a gas refrigerant pipe 23 and a liquid refrigerant pipe 24, whereby a closed-cycle refrigerant circuit 25 is configured.
  • the plurality of indoor units 3 are connected in parallel to each other via the gas refrigerant pipe 23 and the liquid refrigerant pipe 24 branched from the gas refrigerant pipe 23 and the liquid refrigerant pipe 24.
  • the air conditioner 1 circulates the refrigerant discharged from the compressor 10 to the outdoor heat exchanger 12 side via the four-way switching valve 11, and receives the receiver 15, the cooling electric expansion valve 22, the indoor heat exchanger 20, and the four-way switching valve 11.
  • the outdoor heat exchanger 12 functions as a condenser
  • the indoor heat exchanger 20 functions as an evaporator so that a cooling operation can be performed.
  • the refrigerant discharged from the compressor 10 is circulated to the indoor heat exchanger 20 side via the four-way switching valve 11, and the receiver 15, the heating electric expansion valve 14, the outdoor heat exchanger 12, the four-way switching valve 11, and
  • the indoor heat exchanger 20 functions as a condenser
  • the outdoor heat exchanger 12 functions as an evaporator so that heating operation can be performed.
  • the lengths of the gas refrigerant pipe 23 and the liquid refrigerant pipe 24 that connect the outdoor unit 2 and the indoor unit 3 vary depending on the environment in which the air conditioner 1 is installed. For this reason, when the outdoor unit 2 is preliminarily filled with a predetermined amount of refrigerant and the air conditioner 1 is installed in the field, the length of the pipe connecting the outdoor unit 2 and the indoor unit 3 when the test operation is performed Insufficient amount of refrigerant must be charged according to the number of indoor units 3 connected. When the refrigerant is additionally charged, the following liquid level detection circuit 30 and the refrigerant amount detection unit 35 are incorporated in order to always be able to charge an appropriate amount of refrigerant without depending on the construction level at the site. Yes.
  • the liquid level detection circuit 30 includes a bypass circuit 31 that can take out the refrigerant from a predetermined height position in the receiver 15 to the suction side of the compressor 10, and a capillary tube, an expansion valve, and the like provided in the bypass circuit 31. And a temperature sensor (temperature detection unit) 34 such as a thermistor for detecting the refrigerant temperature after being taken out by the bypass circuit 31 and decompressed by the decompression mechanism 32. .
  • the refrigerant amount detection unit 35 is for determining whether or not an appropriate amount of refrigerant is filled based on the temperature detected by the temperature sensor 34.
  • the liquid refrigerant is accumulated in the receiver 15, The liquid level reaches the height position at which the bypass circuit 31 is opened, and the detected temperature from the temperature sensor 34 when the saturated liquid refrigerant is taken out to the bypass circuit 31 and the liquid refrigerant at a predetermined height position.
  • Whether or not an appropriate amount of refrigerant has been charged based on the temperature difference from the temperature detected by the temperature sensor 34 when the saturated gas refrigerant is taken out from the receiver 15 to the bypass circuit 31 from the receiver 15. Can be determined.
  • the refrigerant amount detection unit 35 sets the intermediate pressure in the receiver 15 to 5 degrees or more of the saturated gas temperature at which the superheat is low, and the slope of the saturated gas line in the pressure-enthalpy diagram is on the right. It has a function to control the pressure to become a shoulder rise area. This is because, for example, the intermediate pressure detected by the intermediate pressure sensor 36 is not less than 5 deg. Of the saturated gas temperature of the low pressure on the pressure-enthalpy diagram, and the slope of the saturated gas line rises to the right.
  • the pressure is controlled by adjusting the rotational speed of the compressor 10, the rotational speed of the outdoor fan 13, or the opening degree of the heating electric expansion valve 14 so that the pressure becomes the same pressure.
  • the intermediate pressure in the receiver 15 is a pressure obtained by using the detected temperature from the temperature sensor 37 provided in the refrigerant take-out portion of the bypass circuit 31 as the saturated gas temperature of the refrigerant, as shown in FIG. 2. Or the refrigerant provided at the outlet of the high-pressure sensor 38 and the outdoor heat exchanger 12 provided in the discharge pipe of the compressor 10 as shown in FIG. On the basis of the detected value from the temperature sensor 39 that detects the degree of supercooling, the enthalpy may be converted into a saturated liquid pressure that is constant.
  • the refrigerant circuit 25 is operated as a cooling cycle.
  • the outdoor fan 13 is controlled so that the condensation pressure in the outdoor heat exchanger 12 becomes a predetermined value, and at the outlet of the indoor heat exchanger 20, a predetermined superheat degree is given to the refrigerant.
  • the opening degree of the electric expansion valve 22 is controlled.
  • the refrigerant can be filled in the refrigerant circuit 25 in a state where the liquid refrigerant pipe 24 is filled with the liquid refrigerant having a predetermined density.
  • the electromagnetic opening / closing valve 33 of the liquid level detection circuit 30 is open.
  • the refrigerant circulation amount in the refrigerant circuit 25 is gradually increased, and the liquid level of the refrigerant in the receiver 15 gradually rises. This is because the amount of refrigerant evaporated in the indoor heat exchanger 20 and the amount of refrigerant condensed in the outdoor heat exchanger 12 are balanced, and the receiver 15 is filled with the amount of refrigerant charged from the outside. Liquid refrigerant gradually accumulates. At this time, the saturated gas refrigerant in the receiver 15 flows to the bypass circuit 31 until the liquid refrigerant is accumulated in the receiver 15 up to a height position where the bypass circuit 31 of the liquid level detection circuit 30 is opened. That is, when the liquid level of the liquid refrigerant rises to the height position where the bypass circuit 31 is opened, the saturated liquid refrigerant flows into the bypass circuit 31.
  • the saturated gas refrigerant or saturated liquid refrigerant is decompressed to a low pressure state by the decompression mechanism 33, and the temperature drops.
  • the refrigerant amount detection unit 35 looks at the temperature difference between the temperature drop from the saturated gas refrigerant state and the temperature drop from the saturated liquid refrigerant state. It is determined that the liquid refrigerant of a predetermined liquid level has accumulated in the receiver 15, and it is determined that the required amount of refrigerant has been filled. At this point, the refrigerant filling operation is terminated.
  • the temperature difference is sufficiently secured.
  • the saturated liquid refrigerant that has flowed into the bypass circuit 31 is decompressed by the decompression mechanism 33 to become a gas-liquid two-phase state and evaporates, so that the temperature detected by the temperature sensor 34 rapidly decreases.
  • the refrigerant flowing in the saturated gas state increases the discharge-side pressure of the compressor 10 due to, for example, an increase in the outside air temperature, and the strip pressure in which the slope of the saturated gas line in the pressure-enthalpy diagram increases to the left.
  • a gas-liquid two-phase state occurs when the pressure is reduced by the pressure reducing mechanism 33. In this case, a rapid temperature drop due to the evaporation of the refrigerant is detected, and the refrigerant amount detecting unit 35 is
  • the liquid refrigerant may erroneously be determined to have reached a predetermined liquid level.
  • the intermediate pressure of the refrigerant in the receiver 15 is not less than 5 deg. Of the saturated gas temperature of the low pressure, and the saturated gas line on the pressure-enthalpy diagram. Since the saturated gas refrigerant in this state is taken out to the bypass circuit 31 and is depressurized to lower the temperature, the saturation of the refrigerant depressurized to low pressure is controlled. It is possible to always secure a superheat degree SH of 5 deg or more with respect to the gas temperature.
  • FIG. 4 is a pressure-enthalpy diagram when the pressure in the receiver 15 is set to the vicinity of the maximum enthalpy with a saturated gas line.
  • R410A refrigerant the refrigerant is taken out from the vicinity of 2 MPa to the bypass circuit 31 and the temperature is lowered.
  • the pressure-enthalpy diagram at the time of the actual refrigerant filling operation is as shown in FIG. That is, although the discharge side pressure of the compressor 10 is higher than the intermediate pressure in the receiver 15, the intermediate pressure in the receiver 15 flows into the intermediate pressure sensor 36 and the bypass circuit 31 without being influenced by this high pressure.
  • the intermediate pressure is detected from the detected value from the temperature sensor 37 for detecting the temperature, the temperature sensor 39 for detecting the degree of refrigerant supercooling at the outlet of the high pressure sensor 38 and the outdoor heat exchanger 13 or the converted value thereof.
  • the rotational speed, the rotational speed of the outdoor fan 13 that ventilates the outdoor air to the outdoor heat exchanger 12, or the opening degree of the heating expansion valve 14, etc. the liquid refrigerant in the receiver 15 is controlled by the above pressure. It is on the saturated liquid line.
  • the saturated gas refrigerant or the saturated liquid refrigerant is taken out from the receiver 15 to the bypass circuit 31 and is decompressed by the decompression mechanism 33 to decrease the temperature, and the temperature is detected by the temperature sensor 34 to detect the refrigerant amount from the temperature difference.
  • the amount of refrigerant can be accurately detected via the unit 35. Therefore, according to the present embodiment, the temperature difference is sufficiently reduced without being influenced by the discharge side pressure (high pressure) of the refrigerant that is influenced by the outside air temperature or the like and without providing the refrigerant heating unit in the bypass circuit 31. It is possible to secure and detect the refrigerant filling amount with high accuracy, and to fill the optimum amount of refrigerant without excess and deficiency and to operate the air conditioner stably.
  • FIG. 6 a part of the hot gas discharged from the compressor 10 can be introduced into the receiver 15 between the discharge pipe from the compressor 10 and the receiver 15.
  • the hot gas bypass circuit 40 is provided.
  • the hot gas bypass circuit 40 is provided with an electromagnetic opening / closing valve 41 and a pressure reducing mechanism 42 such as a capillary tube or an expansion valve.
  • the hot gas bypass circuit 40 in which the electromagnetic on-off valve 41 and the pressure reducing mechanism 42 are interposed is provided between the discharge side of the compressor 10 and the receiver 15, and is discharged from the compressor 10 into the receiver 15.
  • the electromagnetic on-off valve 41 can be used even when the intermediate pressure in the receiver 15 does not rise to the above-described pressure during the refrigerant charging operation, for example, under a low outside air temperature condition. Is opened, and hot gas is introduced into the receiver 15 via the hot gas bypass circuit 40, whereby the intermediate pressure in the receiver 15 can be controlled to the above-described pressure.
  • the refrigerant charging amount can be detected with high accuracy, and the optimal amount of refrigerant can be charged.
  • This also makes it possible to easily increase the pressure even under low outside air temperature conditions.
  • the control for reducing the pressure is easy and the control for increasing the pressure is difficult.
  • the pressure control at the low outside air temperature can be facilitated.
  • the hot gas bypass circuit 40 can be effectively applied not only to the refrigerant charging operation but also to high pressure control at the time of cooling at a low outside air temperature, and contributes to the expansion of the cooling operation range by the air conditioner 1. Can do.
  • the bypass circuit 31 of the liquid level detection circuit 30 is inserted and connected to the receiver 15 from the upper surface of the receiver 15, but the bypass circuit 31 has a predetermined height in the receiver 15. It is only necessary to be connected so as to be opened at a position, and therefore, it may be inserted so as to be opened from a side surface or a lower surface of the receiver 15 so as to be opened at a predetermined height position.

Landscapes

  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Mechanical Engineering (AREA)
  • Thermal Sciences (AREA)
  • General Engineering & Computer Science (AREA)
  • Air Conditioning Control Device (AREA)

Abstract

La présente invention a trait à un climatiseur et à un procédé de détection de la quantité de fluide frigorigène dans le climatiseur, laquelle quantité de charge de fluide frigorigène peut être régulièrement détectée avec grande précision, sans fournir d'unité de chauffage sur un circuit de détection de niveau de liquide. Un climatiseur (1) auquel sont connectées une unité extérieure (2) et une unité intérieure (3), est équipé d'un circuit de détection de niveau de liquide (30) doté d'une soupape d'ouverture et de fermeture (33) ainsi que d'un mécanisme de décompression (32) qui sont disposés sur un circuit de dérivation (31) qui connecte une position en hauteur prédéterminée à l'intérieur d'un réservoir (15) au côté d'aspiration d'un compresseur (10) ; d'une unité de détection de température (34) permettant de détecter la température du fluide frigorigène qui passe par le circuit de détection de niveau de liquide (30) et qui est décompressé au moyen d'un mécanisme de décompression (32) ; et d'une unité de détection de la quantité de fluide frigorigène (35) qui commande une pression intermédiaire à l'intérieur du réservoir (15) par rapport à une pression à laquelle la température surchauffée est au moins supérieure de 5 degrés par rapport à la température d'un gaz saturé à basse pression, une ligne de gaz saturé s'étendant en diagonale dans la direction allant vers le haut à droite d'un diagramme pression-enthalpie, laquelle unité de détection de la fluide frigorigène détecte la température du fluide frigorigène transféré à partir du réservoir (15) jusqu'au circuit de détection de niveau de liquide (30) au moyen d'une unité de détection de température (34) de manière à déterminer la quantité de charge de fluide frigorigène en fonction de la température.
PCT/JP2010/071064 2009-12-10 2010-11-25 Climatiseur et procédé de détection de la quantité de fluide frigorigène dans le climatiseur WO2011070917A1 (fr)

Priority Applications (2)

Application Number Priority Date Filing Date Title
CN201080030950.9A CN102472538B (zh) 2009-12-10 2010-11-25 空调装置及空调装置的制冷剂量检测方法
EP10835839.1A EP2511629A4 (fr) 2009-12-10 2010-11-25 Climatiseur et procédé de détection de la quantité de fluide frigorigène dans le climatiseur

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2009-280791 2009-12-10
JP2009280791A JP5595025B2 (ja) 2009-12-10 2009-12-10 空気調和機および空気調和機の冷媒量検出方法

Publications (1)

Publication Number Publication Date
WO2011070917A1 true WO2011070917A1 (fr) 2011-06-16

Family

ID=44145464

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/JP2010/071064 WO2011070917A1 (fr) 2009-12-10 2010-11-25 Climatiseur et procédé de détection de la quantité de fluide frigorigène dans le climatiseur

Country Status (4)

Country Link
EP (1) EP2511629A4 (fr)
JP (1) JP5595025B2 (fr)
CN (1) CN102472538B (fr)
WO (1) WO2011070917A1 (fr)

Families Citing this family (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP6105256B2 (ja) * 2012-10-31 2017-03-29 株式会社日本クライメイトシステムズ 車両用空調装置
US10563892B2 (en) 2014-10-01 2020-02-18 Danfoss A/S Method and system for estimating loss of refrigerant charge in a refrigerant vapor compression system
DE112016002900T5 (de) * 2015-06-24 2018-03-08 Denso Corporation Kältekreislaufvorrichtung
CN109869941B (zh) * 2018-12-17 2020-03-10 珠海格力电器股份有限公司 热泵系统、吸气过热度及气液分离器积液蒸发控制方法
WO2020188753A1 (fr) * 2019-03-19 2020-09-24 三菱電機株式会社 Unité extérieure et dispositif à cycle de réfrigération équipé de celle-ci
CN109899940A (zh) * 2019-03-21 2019-06-18 珠海格力电器股份有限公司 空调系统及其冷媒量的控制方法
WO2021065005A1 (fr) * 2019-10-04 2021-04-08 三菱電機株式会社 Dispositif d'évaluation de l'étanchéité à l'air
JP7489817B2 (ja) 2020-04-17 2024-05-24 東芝ライフスタイル株式会社 空気調和機

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS63231154A (ja) * 1987-03-17 1988-09-27 中野冷機株式会社 冷凍装置
JPH06201234A (ja) * 1993-01-07 1994-07-19 Hitachi Ltd 空気調和機
JP2002350014A (ja) 2001-05-22 2002-12-04 Daikin Ind Ltd 冷凍装置
JP2004218865A (ja) * 2003-01-10 2004-08-05 Daikin Ind Ltd 冷凍装置及び冷凍装置の冷媒量検出方法
JP2008298335A (ja) * 2007-05-30 2008-12-11 Fujitsu General Ltd 冷凍装置および同冷凍装置に用いられる冷媒追加充填キット並びに冷凍装置の冷媒追加充填方法

Family Cites Families (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2502197B2 (ja) * 1990-05-31 1996-05-29 三菱電機株式会社 冷凍サイクル装置
JP3439178B2 (ja) * 1993-12-28 2003-08-25 三菱電機株式会社 冷凍サイクル装置
FR2738331B1 (fr) * 1995-09-01 1997-11-21 Profroid Ind Sa Dispositif d'optimisation energetique d'un ensemble de refrigeration a compression et a detente directe
FR2775339B1 (fr) * 1998-02-24 2000-03-31 Jf Cesbron Holding Soc Installation frigorifique a compression
JP2002286333A (ja) * 2001-03-28 2002-10-03 Mitsubishi Electric Corp 冷凍装置
WO2006015629A1 (fr) * 2004-08-09 2006-02-16 Carrier Corporation Vidange de vapeur instantanée du réservoir d’un circuit refrigérant
ATE544992T1 (de) * 2004-08-09 2012-02-15 Carrier Corp Co2-kühlkreislauf mit unterkühlung des flüssigkältemittels gegen das sammelbehälter- flashgas und verfahren zum betrieb desselben
JP5035024B2 (ja) * 2008-02-29 2012-09-26 ダイキン工業株式会社 空気調和装置および冷媒量判定方法

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS63231154A (ja) * 1987-03-17 1988-09-27 中野冷機株式会社 冷凍装置
JPH06201234A (ja) * 1993-01-07 1994-07-19 Hitachi Ltd 空気調和機
JP2002350014A (ja) 2001-05-22 2002-12-04 Daikin Ind Ltd 冷凍装置
JP2004218865A (ja) * 2003-01-10 2004-08-05 Daikin Ind Ltd 冷凍装置及び冷凍装置の冷媒量検出方法
JP3719246B2 (ja) 2003-01-10 2005-11-24 ダイキン工業株式会社 冷凍装置及び冷凍装置の冷媒量検出方法
JP2008298335A (ja) * 2007-05-30 2008-12-11 Fujitsu General Ltd 冷凍装置および同冷凍装置に用いられる冷媒追加充填キット並びに冷凍装置の冷媒追加充填方法

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See also references of EP2511629A4 *

Also Published As

Publication number Publication date
EP2511629A4 (fr) 2017-09-13
CN102472538B (zh) 2014-07-23
EP2511629A1 (fr) 2012-10-17
JP2011122766A (ja) 2011-06-23
CN102472538A (zh) 2012-05-23
JP5595025B2 (ja) 2014-09-24

Similar Documents

Publication Publication Date Title
EP2511630B1 (fr) Climatiseur et procédé de détection de la quantité de fluide frigorigène pour le climatiseur
WO2011070917A1 (fr) Climatiseur et procédé de détection de la quantité de fluide frigorigène dans le climatiseur
US6581397B1 (en) Refrigerating device
EP3683524B1 (fr) Dispositif frigorifique
JP4931848B2 (ja) ヒートポンプ式給湯用室外機
EP2960597B1 (fr) Dispositif de climatisation
KR101421908B1 (ko) 공기 조화 장치
US7647784B2 (en) Refrigeration device and method for detecting refrigerant amount of refrigeration device
EP2765371B1 (fr) Dispositif à cycle de réfrigération
US9857088B2 (en) Air-conditioning apparatus
JP2007170769A (ja) 空気調和機
EP2420765B1 (fr) Unité de source de chaleur
JP5535504B2 (ja) マルチ形空気調和機
JP4816032B2 (ja) 冷凍装置
JP6537629B2 (ja) 空気調和装置

Legal Events

Date Code Title Description
WWE Wipo information: entry into national phase

Ref document number: 201080030950.9

Country of ref document: CN

121 Ep: the epo has been informed by wipo that ep was designated in this application

Ref document number: 10835839

Country of ref document: EP

Kind code of ref document: A1

WWE Wipo information: entry into national phase

Ref document number: 2010835839

Country of ref document: EP

NENP Non-entry into the national phase

Ref country code: DE