JP2716248B2 - Heat pump type air conditioner - Google Patents
Heat pump type air conditionerInfo
- Publication number
- JP2716248B2 JP2716248B2 JP2193324A JP19332490A JP2716248B2 JP 2716248 B2 JP2716248 B2 JP 2716248B2 JP 2193324 A JP2193324 A JP 2193324A JP 19332490 A JP19332490 A JP 19332490A JP 2716248 B2 JP2716248 B2 JP 2716248B2
- Authority
- JP
- Japan
- Prior art keywords
- temperature
- compression
- stage compression
- heat exchanger
- detecting means
- Prior art date
- Legal status (The legal status 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 status listed.)
- Expired - Fee Related
Links
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
- F25B1/00—Compression machines, plants or systems with non-reversible cycle
- F25B1/10—Compression machines, plants or systems with non-reversible cycle with multi-stage compression
-
- 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
- F25B2400/00—General features or devices for refrigeration machines, plants or systems, combined heating and refrigeration systems or heat-pump systems, i.e. not limited to a particular subgroup of F25B
- F25B2400/07—Details of compressors or related parts
- F25B2400/075—Details of compressors or related parts with parallel compressors
-
- 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
- F25B2400/00—General features or devices for refrigeration machines, plants or systems, combined heating and refrigeration systems or heat-pump systems, i.e. not limited to a particular subgroup of F25B
- F25B2400/13—Economisers
-
- 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
- F25B2400/00—General features or devices for refrigeration machines, plants or systems, combined heating and refrigeration systems or heat-pump systems, i.e. not limited to a particular subgroup of F25B
- F25B2400/23—Separators
-
- 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
- F25B2700/2117—Temperatures of an evaporator
- F25B2700/21171—Temperatures of an evaporator of the fluid cooled by the evaporator
- F25B2700/21173—Temperatures of an evaporator of the fluid cooled by the evaporator at the outlet
Landscapes
- Air Conditioning Control Device (AREA)
Description
【発明の詳細な説明】 産業上の利用分野 本発明は、単段圧縮と２段圧縮とを切り換え制御する
ヒートポンプ式空気調和機に関するものである。Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a heat pump type air conditioner that controls switching between single-stage compression and two-stage compression.
従来の技術 一般に、低温冷蔵庫やバッチ式凍結設備など、蒸発圧
力が極めて低く圧縮比の高い運転状態を必要とする冷凍
装置においては、２段圧縮式冷凍サイクルが使用されて
おり、単段の冷凍サイクルに比べてエネルギー効率の高
い冷凍サイクルを構成することができる（たとえば特開
平２−10062号公報）。2. Description of the Related Art Generally, in a refrigerating apparatus such as a low-temperature refrigerator or a batch-type freezing equipment, which requires an operating state with a very low evaporating pressure and a high compression ratio, a two-stage compression refrigerating cycle is used, and a single-stage refrigerating cycle is used. A refrigeration cycle having higher energy efficiency than a cycle can be configured (for example, Japanese Patent Laid-Open No. 2-10062).
以下、図面を参照しながら上記従来の２段圧縮式冷凍
サイクルについて説明する。第４図は、従来の２段圧縮
式冷凍サイクル図である。第４図において、１は第１圧
縮部1aと第２圧縮部1bとを有する圧縮装置、3aは蒸発
器、4aおよび4bは第１および第２膨張弁、4cは補助膨張
弁、５は気液分離器、6aは凝縮器であり、圧縮装置１の
第２圧縮部1bの吐出側は凝縮器6a、第２膨張弁4b、気液
分離器５、第１膨張弁4a、蒸発器3aを通して圧縮装置１
の第１圧縮部1aの吸入側に接続されている。また、気液
分離器５のガス出口と、圧縮装置１の中で第１圧縮部1a
と第２圧縮部1bを連結する連結流路との間に、ガス冷媒
を第２圧縮部1bの吸入側に送るインジェクション回路を
バイパス接続して、冷凍サイクルの効率を上げることが
行なわれている。さらに凝縮器6aを出口側に冷媒の一部
を補助膨張弁4cを通してインジェクション路に導く液冷
媒導入路が設けられている。Hereinafter, the conventional two-stage compression refrigeration cycle will be described with reference to the drawings. FIG. 4 is a diagram of a conventional two-stage compression refrigeration cycle. In FIG. 4, reference numeral 1 denotes a compression device having a first compression section 1a and a second compression section 1b; 3a, an evaporator; 4a and 4b, first and second expansion valves; The liquid separator, 6a is a condenser, and the discharge side of the second compression section 1b of the compressor 1 passes through the condenser 6a, the second expansion valve 4b, the gas-liquid separator 5, the first expansion valve 4a, and the evaporator 3a. Compression device 1
Is connected to the suction side of the first compression section 1a. Further, the gas outlet of the gas-liquid separator 5 and the first compression unit 1a in the compression device 1
An injection circuit that sends gas refrigerant to the suction side of the second compression unit 1b is bypass-connected between the refrigerant and the connection flow path that connects the second compression unit 1b, thereby increasing the efficiency of the refrigeration cycle. . Further, a liquid refrigerant introduction path for guiding a part of the refrigerant to the injection path through the auxiliary expansion valve 4c is provided on the outlet side of the condenser 6a.
この２段圧縮式冷凍サイクルにおいて、圧縮装置１の
第２圧縮部1bから吐出された冷媒を凝縮器6a、第２膨張
弁4b、気液分離器５、第１膨張弁4a、蒸発器3aを流れ
て、圧縮装置１の第１圧縮部1aに吸入される。このと
き、気液分離器５の飽和ガスはインジェクション回路を
通って第２圧縮部1bの吸入側に送られて、冷凍サイクル
の効率を向上させている。さらに、凝縮器6aから液冷媒
が補助膨張弁4cを通して気液分離器５の飽和ガス出口側
と第２圧縮部1bの吸入側に導かれる。In this two-stage compression refrigeration cycle, the refrigerant discharged from the second compression section 1b of the compressor 1 is supplied to the condenser 6a, the second expansion valve 4b, the gas-liquid separator 5, the first expansion valve 4a, and the evaporator 3a. It flows and is sucked into the first compression section 1a of the compression device 1. At this time, the saturated gas of the gas-liquid separator 5 is sent to the suction side of the second compression section 1b through the injection circuit, thereby improving the efficiency of the refrigeration cycle. Further, the liquid refrigerant is guided from the condenser 6a to the saturated gas outlet side of the gas-liquid separator 5 and the suction side of the second compression section 1b through the auxiliary expansion valve 4c.
発明が解決しようとする課題 しかしながら、上記従来の２段圧縮式冷凍サイクルを
ヒートポンプ式空気調和機に適用する場合には、以下の
ような課題があった。すなわち、第５図に示すヒートポ
ンプ式空気調和機の暖房運転時に室内熱交換器（凝縮
器）温度もしくは室内熱交換器を通過して室内に吹き出
す空気の温度（吹き出し温度）とエネルギー効率（以下
EERと言う）の関係図および第６図に示す外気温度とEER
の関係図よりわかるように、常に２段圧縮運転を行う
と、吹き出し温度が低い場合、あるいは外気温度が高い
場合、単段圧縮運転よりEERが低下してしまうという課
題を有していた。Problems to be Solved by the Invention However, when the above-described conventional two-stage compression refrigeration cycle is applied to a heat pump type air conditioner, there are the following problems. That is, during the heating operation of the heat pump type air conditioner shown in FIG. 5, the temperature of the indoor heat exchanger (condenser) or the temperature of the air that passes through the indoor heat exchanger and is blown into the room (blowing temperature) and the energy efficiency (hereinafter, referred to as the temperature).
EER) and the outside air temperature and EER shown in FIG.
As can be understood from the relationship diagram, when the two-stage compression operation is always performed, the EER is lower than in the single-stage compression operation when the blow-out temperature is low or when the outside air temperature is high.
本発明は上記課題を解決するもので、吹き出し温度が
低い場合、あるいは外気温度が高い場合に、単段圧縮運
転を可能にして、エネルギー利用効率の高い冷凍サイク
ルを実現できるヒートポンプ式空気調和機を提供するこ
とを目的とするものである。The present invention solves the above-described problems, and provides a heat pump type air conditioner that can perform a single-stage compression operation when a blowing temperature is low or when an outside air temperature is high and can realize a refrigeration cycle with high energy use efficiency. It is intended to provide.
課題を解決するための手段 上記課題を解決するために本発明のヒートポンプ式空
気調和機は、第１圧縮部と第２圧縮部の２つの圧縮機構
を有する圧縮装置、室外熱交換器、減圧器、気液分離
器、室内熱交換器を連結して冷媒回路を構成し、室内熱
交換器温度もしくは室内熱交換器を通過して室内に吹き
出す空気の温度を検出する第１温度検出手段および外気
温度を検出する第２温度検出手段を設け、第１圧縮部ま
たは第２圧縮部単独でもしくは第１圧縮部と前記第２圧
縮部とを並列に連結して冷媒を圧縮する単段圧縮運転と
第１圧縮部と第２圧縮部を直列に連結して冷媒を圧縮す
る２段圧縮運転を切り換え可能とする流路切り換え手段
を設け、第１温度検出手段と第２温度検出手段とにより
検出された温度に応じて単段圧縮運転と２段圧縮運転と
を切り換え制御する制御部を設けたものである。Means for Solving the Problems To solve the above problems, a heat pump type air conditioner of the present invention includes a compression device having two compression mechanisms of a first compression unit and a second compression unit, an outdoor heat exchanger, and a decompressor. A first temperature detecting means for detecting a temperature of the indoor heat exchanger or a temperature of air which passes through the indoor heat exchanger and is blown into the room by connecting the gas-liquid separator and the indoor heat exchanger; A single-stage compression operation for compressing a refrigerant by providing a second temperature detection means for detecting a temperature, connecting the first compression unit or the second compression unit alone or connecting the first compression unit and the second compression unit in parallel; A flow path switching means is provided for switching the two-stage compression operation for compressing the refrigerant by connecting the first compression section and the second compression section in series, and is detected by the first temperature detection section and the second temperature detection section. Single-stage compression operation and two-stage compression operation depending on the temperature And a control unit for controlling the switching between the reverse and the reverse.
また、本発明の他のヒートポンプ式空気調和機は、第
１圧縮部と第２圧縮部の２つの圧縮機構を有する圧縮装
置、室外熱交換器、減圧器、気液分離器、室内熱交換器
を連結し、室内熱交換器温度もしくは室内熱交換器を通
過して室内に吹き出す空気の温度を検出する第１温度検
出手段および外気温度を検出する第２温度検出手段と、
第１圧縮部または第２圧縮部単独でもしくは第１圧縮部
と第２圧縮部とを並列に連結して冷媒を圧縮する単段圧
縮運転と、第１圧縮部と第２圧縮部を直列に連結して冷
媒を圧縮する２段圧縮運転を切り換え可能とする流路切
り換え手段と、第１温度検出手段により検出された温度
と第２温度検出手段により検出された温度により算出さ
れる関数値により単段圧縮運転と２段圧縮運転とを切り
換え制御する制御部を設けたものである。Further, another heat pump type air conditioner of the present invention includes a compression device having two compression mechanisms of a first compression part and a second compression part, an outdoor heat exchanger, a decompressor, a gas-liquid separator, and an indoor heat exchanger. A first temperature detecting means for detecting the temperature of the indoor heat exchanger or a temperature of air passing through the indoor heat exchanger and blowing into the room, and a second temperature detecting means for detecting an outside air temperature;
A single-stage compression operation for compressing the refrigerant by connecting the first compression unit or the second compression unit alone or by connecting the first compression unit and the second compression unit in parallel, and connecting the first compression unit and the second compression unit in series Flow path switching means for switching the two-stage compression operation for connecting and compressing the refrigerant, and a function value calculated by the temperature detected by the first temperature detection means and the temperature detected by the second temperature detection means A control unit is provided for switching between single-stage compression operation and two-stage compression operation.
作用 本発明は、上記構成により、第１温度検出手段と前記
第２温度検出手段とにより検出された温度に応じて単段
圧縮運転と２段圧縮運転とを切り換え制御し、たとえ
ば、第１温度検出手段により検出された温度が所定値よ
り低く、しかも第２温度検出手段により検出された温度
が所定値より高い場合に単段圧縮運転を行い、前記第１
温度検出手段により検出された温度が所定値より高い
か、もしくは前記第１温度検出手段により検出された温
度が所定値より低く、かつ前記第２温度検出手段により
検出された温度が所定値より低いかのいずれかの場合
に、単段圧縮運転から２段圧縮運転に切り換え制御する
ことにより、常にエネルギー効率の高い状態での運転が
実現できる。Operation The present invention, by the above configuration, controls switching between the single-stage compression operation and the two-stage compression operation in accordance with the temperature detected by the first temperature detection unit and the second temperature detection unit. When the temperature detected by the detection means is lower than a predetermined value and the temperature detected by the second temperature detection means is higher than a predetermined value, the single-stage compression operation is performed, and the first compression operation is performed.
The temperature detected by the temperature detecting means is higher than a predetermined value, or the temperature detected by the first temperature detecting means is lower than a predetermined value, and the temperature detected by the second temperature detecting means is lower than a predetermined value. In either case, by controlling the switching from the single-stage compression operation to the two-stage compression operation, it is possible to always realize an operation with high energy efficiency.
また、第１温度検出手段により検出された温度と第２
温度検出手段により検出された温度により算出される関
数値により単段圧縮運転を２段圧縮運転とを切り換え制
御することにより、より一層効率の良い状態での運転が
可能となる。Further, the temperature detected by the first temperature detecting means and the second
By switching and controlling the single-stage compression operation and the two-stage compression operation based on the function value calculated based on the temperature detected by the temperature detecting means, the operation in a more efficient state can be performed.
実施例 以下、本発明の一実施例について図面を参考に説明す
る。なお、本実施例を説明するにあたり、第４図に示す
従来のものと同一の機能を有するものには、同一の番号
をつけて説明を省略する。Embodiment Hereinafter, an embodiment of the present invention will be described with reference to the drawings. In the description of the present embodiment, components having the same functions as those of the conventional device shown in FIG.
第１図は、本発明の一実施例における冷凍サイクル図
である。第１図において、２は冷房運転と暖房運転を切
り換え制御する四方弁、３は蒸発器である室外熱交換
器、６は凝縮器である室内熱交換器、7aはインジェクシ
ョン回路に設けられた二方弁、7bは第２圧縮部1bの吸入
側に設けられた二方弁、7cは単段圧縮時の第１圧縮部1a
の吐出側い設けられた二方弁、7dは２段圧縮時の第２圧
縮部1bの吐出側に設けられた二方弁、８は室内熱交換器
６の温度もしくは室内熱交換器６を通過して室内に吹き
出す空気の温度を検出する第１温度検出手段、９は外気
温度を検出する第２温度検出手段、10は第１および第２
温度検出手段8,9で検出された温度により、二方弁7a〜7
dを制御し、単段圧縮運転と２段圧縮運転とに切り換え
る制御部である。FIG. 1 is a refrigeration cycle diagram in one embodiment of the present invention. In FIG. 1, reference numeral 2 denotes a four-way valve for controlling switching between a cooling operation and a heating operation, 3 denotes an outdoor heat exchanger which is an evaporator, 6 denotes an indoor heat exchanger which is a condenser, and 7a denotes a two-way valve provided in an injection circuit. 7b is a two-way valve provided on the suction side of the second compression unit 1b, and 7c is a first compression unit 1a in single-stage compression.
7d is a two-way valve provided on the discharge side of the second compression unit 1b during two-stage compression, and 8 is the temperature of the indoor heat exchanger 6 or the indoor heat exchanger 6. First temperature detecting means for detecting the temperature of the air passing through and blowing into the room, 9 is second temperature detecting means for detecting the outside air temperature, and 10 is the first and second temperature detecting means.
Depending on the temperature detected by the temperature detecting means 8, 9, the two-way valves 7a to 7
The control unit controls d to switch between single-stage compression operation and two-stage compression operation.
この冷凍サイクルにおいて、冷房運転時には低負荷条
件が多く単段圧縮運転の方が効率が良いため、単段圧縮
運転を行う。すなわち、冷房暖房切り換え用四方弁２で
は実線のように流れ、補助膨張弁（第３の減圧器）4cは
閉の状態、二方弁7a,7bおよび7dは閉の状態、7cは回の
状態である。したがって、第１圧縮部1aから吐出された
冷媒は、二方弁7c、四方弁２、室外熱交換器３、第１膨
張弁（第１の減圧器）4a、気液分離器５、第２膨張弁
（第２の減圧器）4b、室内熱交換器６、四方弁２を流れ
て、第１圧縮機1aに吸入される。このように、冷房運転
時は負荷が比較的低いため、単段圧縮運転を行うことに
より、エネルギー効率の高い運転が可能である。In the refrigeration cycle, the single-stage compression operation is performed because the low-load condition is often large and the single-stage compression operation is more efficient during the cooling operation. That is, the cooling / heating switching four-way valve 2 flows as indicated by the solid line, the auxiliary expansion valve (third decompressor) 4c is in a closed state, the two-way valves 7a, 7b, and 7d are in a closed state, and 7c is a rotating state. It is. Therefore, the refrigerant discharged from the first compression section 1a is supplied to the two-way valve 7c, the four-way valve 2, the outdoor heat exchanger 3, the first expansion valve (first decompressor) 4a, the gas-liquid separator 5, and the second The air flows through the expansion valve (second decompressor) 4b, the indoor heat exchanger 6, and the four-way valve 2 and is sucked into the first compressor 1a. As described above, since the load is relatively low during the cooling operation, the operation with high energy efficiency is possible by performing the single-stage compression operation.
次に、暖房運転時にはまず四方弁２により冷媒の流れ
る方向を転換する。そして、第１温度検出手段８により
検出された室内熱交換器６の温度もしくは室内交換器６
を通過して室内に吹き出す空気の温度（以下吹き出し温
度と言う）および第２温度検出手段９により検出された
外気温度に応じて単段圧縮運転と２段圧縮運転を切り換
えて運転する。このとき、冷房暖房切り換え用四方弁２
は破線のように接続され、補助膨張弁4cは開の状態、二
方弁7a,7bおよび7dは開の状態、7cは閉の状態にする。
そして、第５図および第６図における単段圧縮運転と２
段圧縮運転の交点をそれぞれA,Bとし、第１温度検出手
段８により検出された吹き出し温度Tf,第２温度検出手
段９により検出された外気温度をTgとしたときに、制御
部10は以下に示すような制御をするように構成されてい
る。Next, during the heating operation, first, the flow direction of the refrigerant is changed by the four-way valve 2. Then, the temperature of the indoor heat exchanger 6 detected by the first temperature detecting means 8 or the temperature of the indoor exchanger 6
The operation is switched between a single-stage compression operation and a two-stage compression operation in accordance with the temperature of the air that passes through and is blown into the room (hereinafter referred to as the blowout temperature) and the outside air temperature detected by the second temperature detecting means 9. At this time, the four-way valve 2 for switching between cooling and heating is used.
Are connected as indicated by broken lines, the auxiliary expansion valve 4c is open, the two-way valves 7a, 7b and 7d are open, and 7c is closed.
The single-stage compression operation shown in FIGS.
When the intersections of the stage compression operation are A and B, respectively, and the outlet temperature T f detected by the first temperature detecting means 8 and the outside air temperature detected by the second temperature detecting means 9 are T g , the controller 10 Is configured to perform the following control.
Tf≦A,Tg≧Ｂのとき単段圧縮運転 Tf≦A,Tg＜Ｂのとき２段圧縮運転 Tf＞A,Tg≧Ｂのとき２段圧縮運転 Tf＞A,Tg＜Ｂのとき２段圧縮運転 すなわち、暖房運転時において、第１温度検出手段８
により検出された温度Tfが所定値Ａより低く、しかも第
２温度検出手段９により検出された温度Tgが所定値Ｂよ
り高い場合に単段圧縮運転を行い、第１温度検出手段８
により検出された温度Tfが所定値Ａより高いとき、また
は第１温度検出手段８により検出された温度Tfが所定値
Ａより低くかつ第２温度検出手段９により検出された温
度Tgが所定値Ｂより低いときのいずれかの場合に、単段
圧縮運転から２段圧縮運転に切り換え制御することによ
り、エネルギー効率の高い状態での運転が可能となる。T f ≦ A, T single-stage compression operation when g ≧ B T f ≦ A, T g <2 -stage compression operation T f When B> A, 2-stage compression operation T f time T g ≧ B> A, Two-stage compression operation when T g <B That is, during the heating operation, the first temperature detection means 8
Detected temperature T f is carried out single-stage compression operation in the case lower than the predetermined value A, addition temperature The T g is detected by the second temperature detecting means 9 is higher than the predetermined value B, the first temperature detecting means 8
Temperature The T g was detected detected temperature T f is is higher than the predetermined value A, or and the detected temperature T f by the first temperature detector 8 is lower than the predetermined value A by the second temperature detecting means 9 by the In any of the cases where the value is lower than the predetermined value B, by controlling to switch from the single-stage compression operation to the two-stage compression operation, the operation with high energy efficiency becomes possible.
次に、制御部10が他の動作をする場合の実施例につい
て説明する。冷房運転時は先の場合と同様である。Next, an embodiment in which the control unit 10 performs another operation will be described. At the time of cooling operation, it is the same as the previous case.
暖房運転時の単段圧縮運転と２段圧縮運転の切り換え
制御は以下のように異なる。第２図は吹き出し温度をパ
ラメータにしたときの外気温度とEERの関係図である。
第２図において、単段圧縮運転と２段圧縮運転の交点の
描く軌跡EERtrは、吹き出し温度Tfと外気温度Tgの関数
として式（１）のように表すことができる。Switching control between the single-stage compression operation and the two-stage compression operation during the heating operation differs as follows. FIG. 2 is a diagram showing the relationship between the outside air temperature and the EER when the blowing temperature is used as a parameter.
In FIG. 2, a locus EER tr drawn by the intersection of the single-stage compression operation and the two-stage compression operation can be expressed as a function of the blow-out temperature Tf and the outside air temperature Tg as shown in Expression (1).
EERtr＝ｆ（Tf,Tg） （１） このEERtrを吹き出し温度Tfと外気温度Tgの関係で表
すと、第３図のTftrとして表すことができ、B1〜B6の定
数を用いて外気温度Tgの多項式として式（２）のように
近似できる。EER tr = f (T f , T g ) (1) When this EER tr is represented by the relationship between the blowing temperature T f and the outside air temperature T g , it can be represented as T ftr in FIG. 3, and B 1 to B 6 Can be approximated as equation (2) as a polynomial of the outside air temperature T g using the constant
Tftr＝ｆ（Tg） ≒B1＋B2Tg＋B3Tg 2 ＋B4Tg 3＋B5Tg 4＋B6Tg 5 （ただしTftrはEERtrの別表現）（２） ここで、Tftrは単段圧縮運転と２段圧縮運転のうち、
EERの良い方を示す境界となっていることがわかる。し
たがって、第１温度検出手段８によって検出された吹き
出し温度Tfおよび第２温度検出手段９によって検出され
た外気温度TgとからTf≦Tftrのときは単段圧縮運転を行
い、Tf＞Tftrのときは２段圧縮運転を行うと、最もエネ
ルギー効率の良い状態で運転を行うことが可能となる。T ftr = f (T g ) ≒ B 1 + B 2 T g + B 3 T g 2 + B 4 T g 3 + B 5 T g 4 + B 6 T g 5 (where T ftr is another expression of EER tr ) (2) here And T ftr is one of the single-stage compression operation and the two-stage compression operation.
It can be seen that the boundary shows the better EER. Therefore, when T f ≦ T ftr from the outlet temperature T f detected by the first temperature detecting means 8 and the outside air temperature T g detected by the second temperature detecting means 9, a single-stage compression operation is performed, and T f When> T ftr , performing the two-stage compression operation enables the operation to be performed in the most energy-efficient state.
なお、上記実施例において、単段圧縮運転時では、第
１圧縮部1aが単独で冷媒を圧縮する運転を行うように構
成されているが、第２圧縮部1bの単独運転であってもよ
く、また、第１圧縮部1aと第２圧縮部1bとを並列に連結
して冷媒を圧縮する運転を行うように構成してもよい。In the above embodiment, in the single-stage compression operation, the first compression unit 1a is configured to perform the operation of independently compressing the refrigerant. However, the second compression unit 1b may be independently operated. Alternatively, the first compression section 1a and the second compression section 1b may be connected in parallel to perform an operation of compressing the refrigerant.
また、上記実施例に示した第１圧縮部1aおよび第２圧
縮部1bについては一定容量のものでも良いが、たとえ
ば、インバータを用いた周波数可変型圧縮機のような可
変容量型のものを用いても良い。この場合、大容量運転
にすることで、さらに暖房能力が向上する。Further, the first compression section 1a and the second compression section 1b shown in the above embodiment may be of a fixed capacity, but for example, may be of a variable capacity type such as a variable frequency compressor using an inverter. May be. In this case, the heating capacity is further improved by performing the large-capacity operation.
また、上記実施例に示したたとえばステッピングモー
タなどで駆動される電動の第１、第２膨張弁4a,4bおよ
び補助膨張弁4cのような可変絞りの代わりにキャピラリ
ーチューブを用いても良い。さらに、上述の実施例で
は、流路切り換え制御手段として二方弁を用いたが、三
方弁あるいは四方弁もしくは他の切り換え装置によって
も構わない。Further, a capillary tube may be used instead of the variable throttle such as the first and second electric expansion valves 4a and 4b and the auxiliary expansion valve 4c driven by, for example, the stepping motor shown in the above embodiment. Further, in the above-described embodiment, the two-way valve is used as the flow path switching control means. However, a three-way valve, a four-way valve, or another switching device may be used.
また、第１温度検出手段８と第２温度検出手段９によ
り検出された温度により算出される関数値として、吹き
出し温度をパラメータにした外気温度とEERの関数値を
用いたが、他の関数値でも良い。As the function values calculated by the temperatures detected by the first temperature detecting means 8 and the second temperature detecting means 9, the function values of the outside air temperature and the EER using the blowing temperature as a parameter are used. But it is good.
発明の効果 以上のように本発明によれば、室内熱交換器温度もし
くは室内熱交換器を通過して室内に吹き出す空気の温度
を検出する第１温度検出手段および外気温度を検出する
第２温度検出手段とを有し、第１圧縮部または第２圧縮
部単独でもしくは第１圧縮部と第２圧縮部とを並列に連
結して冷媒を圧縮する単段圧縮運転と第１圧縮部と第２
圧縮部を直列に連結して冷媒を圧縮する２段圧縮運転と
を切り換え可能とする流路切り換え手段を有し、第１温
度検出手段と第２温度検出手段とにより検出された温度
に応じて単段圧縮と２段圧縮とを切り換え制御すること
により、または、室内熱交換器温度もしくは室内熱交換
器を通過して室内に吹き出す空気の温度を検出する第１
温度検出手段および外気温度を検出する第２温度検出手
段とを有し、第１圧縮部または第２圧縮部単独でもしく
は第１圧縮部と第２圧縮部とを並列に連結して冷媒を圧
縮する単段圧縮運転と第１圧縮部と第２圧縮部を直列に
連結して冷媒を圧縮する２段圧縮運転とを切り換え可能
とする流路切り換え手段を有し、第１温度検出手段によ
り検出された温度と第２温度検出手段により検出される
温度により算出される関数値により単段圧縮運転と２段
圧縮運転とを切り換え制御することにより、冷房時は単
段圧縮運転を行い、暖房時は第１温度検出手段により検
出された吹き出し温度および第２温度検出手段により検
出された外気温度により単段圧縮運転と２段圧縮運転と
を切り換え制御することができ、エネルギー利用効率の
高い冷凍サイクルを実現できる。Effect of the Invention As described above, according to the present invention, the first temperature detecting means for detecting the temperature of the indoor heat exchanger or the temperature of the air passing through the indoor heat exchanger and blowing into the room, and the second temperature for detecting the outside air temperature A single-stage compression operation for compressing the refrigerant by detecting the first compression unit or the second compression unit alone or by connecting the first compression unit and the second compression unit in parallel with each other; 2
A flow path switching unit configured to switch between a two-stage compression operation in which the compression units are connected in series to compress the refrigerant, and according to a temperature detected by the first temperature detection unit and the second temperature detection unit; A first method for detecting a temperature of an indoor heat exchanger or a temperature of air that passes through an indoor heat exchanger and is blown into a room by controlling switching between single-stage compression and two-stage compression.
A temperature detecting means and a second temperature detecting means for detecting an outside air temperature, wherein the refrigerant is compressed by connecting the first compression section or the second compression section alone or by connecting the first compression section and the second compression section in parallel. And a flow switching means for switching between a single-stage compression operation and a two-stage compression operation in which the first compression section and the second compression section are connected in series to compress the refrigerant. The single-stage compression operation and the two-stage compression operation are switched and controlled by a function value calculated based on the detected temperature and the temperature detected by the second temperature detection means. Can switch between single-stage compression operation and two-stage compression operation based on the blow-out temperature detected by the first temperature detection means and the outside air temperature detected by the second temperature detection means, and provide a refrigeration cycle with high energy use efficiency. It can be realized.
第１図は、本発明の一実施例を示すヒートポンプ式空気
調和機の冷凍サイクル図、第２図は吹き出し温度をパラ
メータにした外気温度とEERの関係図、第３図は外気温
度と吹き出し温度より判断する単段圧縮運転と２段圧縮
運転の運転条件を定める関係図、第４図は従来の２段圧
縮式冷凍サイクル図、第５図は第１温度検出手段により
検出される室内熱交換器温度もしくは室内熱交換器を通
過して室内に吹き出す空気の吹き出し温度とEERの関係
図、第６図は第２温度検出手段により検出される外気温
度とEERの関係図である。 １……圧縮装置、1a……第１圧縮部、1b……第２圧縮
部、２……冷房暖房切り換え四方弁、３……室外熱交換
器（蒸発器）、4a,4b……第１および第２膨張弁（第１
および第２の減圧器）、4c……補助膨張弁（第３の減圧
器）、５……気液分離器、６……室内熱交換器（凝縮
器）、7a〜7d……二方弁（流路切り換え手段）、８……
第１温度検出手段、９……第２温度検出手段、10……制
御部。FIG. 1 is a refrigeration cycle diagram of a heat pump type air conditioner showing one embodiment of the present invention, FIG. 2 is a diagram showing a relationship between an outside air temperature and an EER using a blowout temperature as a parameter, and FIG. FIG. 4 is a relational diagram for determining operating conditions of the single-stage compression operation and the two-stage compression operation to be judged more clearly, FIG. 4 is a diagram of a conventional two-stage compression refrigeration cycle, and FIG. 5 is indoor heat exchange detected by first temperature detection means. FIG. 6 is a diagram showing the relationship between the unit temperature or the temperature of the air blown out of the room through the indoor heat exchanger and the EER, and FIG. 6 is a diagram showing the relationship between the outside air temperature detected by the second temperature detecting means and the EER. DESCRIPTION OF SYMBOLS 1 ... Compression device, 1a ... 1st compression part, 1b ... 2nd compression part, 2 ... Cooling / heating switching four-way valve, 3 ... Outdoor heat exchanger (evaporator), 4a, 4b ... 1st And the second expansion valve (first
4c... Auxiliary expansion valve (third pressure reducer), 5... Gas-liquid separator, 6... Indoor heat exchanger (condenser), 7a to 7d... Two-way valve (Channel switching means), 8 ...
1st temperature detection means, 9 ... 2nd temperature detection means, 10 ... Control part.
Claims (3)
を有する圧縮装置、室外熱交換器、減圧器、気液分離
器、室内熱交換器を連結してなるヒートポンプ式空気調
和機であって、前記室内熱交換器温度もしくは前記室内
熱交換器を通過して室内に吹き出す空気の温度を検出す
る第１温度検出手段と、外気温度を検出する第２温度検
出手段と、前記第１圧縮部または前記第２圧縮部単独で
もしくは前記第１圧縮部と前記第２圧縮部とを並列に連
結して冷媒を圧縮する単段圧縮運転と前記第１圧縮部と
前記第２圧縮部を直列に連結して冷媒を圧縮する２段圧
縮運転を切り換え可能とする流路切り換え手段と、前記
第１温度検出手段と前記第２温度検出手段とにより検出
された温度に応じて単段圧縮運転と２段圧縮運転とを切
り換え制御する制御部を備えたヒートポンプ式空気調和
機。1. A heat pump type air conditioner comprising a compression device having two compression mechanisms of a first compression portion and a second compression portion, an outdoor heat exchanger, a decompressor, a gas-liquid separator, and an indoor heat exchanger. A first temperature detecting means for detecting a temperature of the indoor heat exchanger or a temperature of air passing through the indoor heat exchanger and blowing into the room; a second temperature detecting means for detecting an outside air temperature; A single-stage compression operation in which the first compression section or the second compression section alone or the first compression section and the second compression section are connected in parallel to compress the refrigerant, and the first compression section and the second compression section Flow path switching means for switching between two-stage compression operation for compressing a refrigerant by connecting parts in series, and a single-stage switching means according to the temperature detected by the first temperature detection means and the second temperature detection means Control to switch between compression operation and two-stage compression operation The heat pump type air conditioner having a.
所定値より低く、しかも第２温度検出手段により検出さ
れた温度が所定値より高い場合に単段圧縮運転を行い、
前記第１温度検出手段により検出された温度が所定値よ
り高いか、もしくは前記第１温度検出手段により検出さ
れた温度が所定値より低く、かつ前記第２温度検出手段
により検出された温度が所定値より低いかのいずれかの
場合に、制御部は単段圧縮運転から２段圧縮運転に切り
換え制御することを特徴とする請求項１記載のヒートポ
ンプ式空気調和機。2. A single-stage compression operation is performed when the temperature detected by the first temperature detecting means is lower than a predetermined value and the temperature detected by the second temperature detecting means is higher than a predetermined value.
The temperature detected by the first temperature detecting means is higher than a predetermined value, or the temperature detected by the first temperature detecting means is lower than a predetermined value, and the temperature detected by the second temperature detecting means is higher than a predetermined value. The heat pump type air conditioner according to claim 1, wherein the control unit controls to switch from the single-stage compression operation to the two-stage compression operation when the value is lower than the value.
を有する圧縮装置、室外熱交換器、減圧器、気液分離
器、室内熱交換器を連結してなるヒートポンプ式空気調
和機であって、前記室内熱交換器温度もしくは前記室内
熱交換器を通過して室内に吹き出す空気の温度を検出す
る第１温度検出手段と、外気温度を検出する第２温度検
出手段と、前記第１圧縮部または前記第２圧縮部単独で
もしくは前記第１圧縮部と前記第２圧縮部とを並列に連
結して冷媒を圧縮する単段圧縮運転と前記第１圧縮部と
前記第２圧縮部を直列に連結して冷媒を圧縮する２段圧
縮運転とを切り換え可能とする流路切り換え手段と、前
記第１温度検出手段により検出された温度と前記第２温
度検出手段により検出された温度により算出される関数
値により単段圧縮運転と２段圧縮運転とを切り換え制御
する制御部を備えたヒートポンプ式空気調和機。3. A heat pump type air conditioner comprising a compression apparatus having two compression mechanisms, a first compression section and a second compression section, an outdoor heat exchanger, a decompressor, a gas-liquid separator, and an indoor heat exchanger. A first temperature detecting means for detecting a temperature of the indoor heat exchanger or a temperature of air passing through the indoor heat exchanger and blowing into the room; a second temperature detecting means for detecting an outside air temperature; A single-stage compression operation in which the first compression section or the second compression section alone or the first compression section and the second compression section are connected in parallel to compress the refrigerant, and the first compression section and the second compression section Flow path switching means for switching between a two-stage compression operation for compressing a refrigerant by connecting parts in series, a temperature detected by the first temperature detection means and a temperature detected by the second temperature detection means Single-stage compression operation based on the function value calculated by When the heat pump type air conditioner having a control unit for controlling switching between the two-stage compression operation.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2193324A JP2716248B2 (en) | 1990-07-20 | 1990-07-20 | Heat pump type air conditioner |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2193324A JP2716248B2 (en) | 1990-07-20 | 1990-07-20 | Heat pump type air conditioner |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH0480545A JPH0480545A (en) | 1992-03-13 |
| JP2716248B2 true JP2716248B2 (en) | 1998-02-18 |
Family
ID=16306011
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2193324A Expired - Fee Related JP2716248B2 (en) | 1990-07-20 | 1990-07-20 | Heat pump type air conditioner |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2716248B2 (en) |
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|---|---|---|---|---|
| US11703284B2 (en) | 2019-11-08 | 2023-07-18 | Ckd Corporation | Temperature control system and integrated temperature control system |
| US11788777B2 (en) | 2019-11-08 | 2023-10-17 | Ckd Corporation | Temperature control system and integrated temperature control system |
| US11656016B2 (en) | 2019-11-20 | 2023-05-23 | Ebara Refrigeration Equipment & Systems Co., Ltd. | Cooling system that comprises multiple cooling apparatus and reduces power consumption |
| US11796247B2 (en) | 2019-11-20 | 2023-10-24 | Ckd Corporation | Temperature control system |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0480545A (en) | 1992-03-13 |
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