JP3208923B2 - Operation control device for air conditioner - Google Patents

Operation control device for air conditioner

Info

Publication number
JP3208923B2
JP3208923B2 JP12700893A JP12700893A JP3208923B2 JP 3208923 B2 JP3208923 B2 JP 3208923B2 JP 12700893 A JP12700893 A JP 12700893A JP 12700893 A JP12700893 A JP 12700893A JP 3208923 B2 JP3208923 B2 JP 3208923B2
Authority
JP
Japan
Prior art keywords
opening
pressure
low
expansion valve
starting
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 - Lifetime
Application number
JP12700893A
Other languages
Japanese (ja)
Other versions
JPH06337174A (en
Inventor
幸生 北出
貴一 増茂
政樹 山本
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Daikin Industries Ltd
Original Assignee
Daikin Industries Ltd
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 Daikin Industries Ltd filed Critical Daikin Industries Ltd
Priority to JP12700893A priority Critical patent/JP3208923B2/en
Publication of JPH06337174A publication Critical patent/JPH06337174A/en
Application granted granted Critical
Publication of JP3208923B2 publication Critical patent/JP3208923B2/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Classifications

    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25BREFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B2313/00Compression machines, plants or systems with reversible cycle not otherwise provided for
    • F25B2313/005Outdoor unit expansion valves

Landscapes

  • Compression-Type Refrigeration Machines With Reversible Cycles (AREA)
  • Air Conditioning Control Device (AREA)

Description

【発明の詳細な説明】DETAILED DESCRIPTION OF THE INVENTION

【0001】[0001]

【産業上の利用分野】本発明は、空気調和装置の運転制
御装置に関し、特に、暖房運転起動時における膨張弁の
制御対策に係るものである。
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an operation control device for an air conditioner, and more particularly to a measure for controlling an expansion valve when a heating operation is started.

【0002】[0002]

【従来の技術】従来より、空気調和装置には、特公平3
−49034号公報に開示されているように、圧縮機と
四路切換弁と室外熱交換器と室外電動膨張弁と室内電動
膨張弁と室内熱交換器とが順に接続されて主冷媒回路が
形成されている。
2. Description of the Related Art Conventionally, air conditioners have
As disclosed in JP-A-49034, a main refrigerant circuit is formed by sequentially connecting a compressor, a four-way switching valve, an outdoor heat exchanger, an outdoor electric expansion valve, an indoor electric expansion valve, and an indoor heat exchanger. Have been.

【0003】そして、冷暖房運転等の起動時において
は、各電動膨張弁の初期値を予め記憶している開度に設
定し、この初期開度に所定時間保持した後、各電動膨張
弁を過熱度及び過冷却度に応じて制御するようにしてい
る。
[0003] At the start of the cooling / heating operation or the like, the initial value of each electric expansion valve is set to a previously stored opening, and after maintaining the initial opening for a predetermined time, each electric expansion valve is overheated. The degree of control and the degree of supercooling are controlled.

【0004】[0004]

【発明が解決しようとする課題】しかしながら、上述し
た空気調和装置においては、上記電動膨張弁の初期開度
の記憶データを安定運転時の開度に書換え可能にしてい
るものゝ、所定時間は一定の初期開度に固定しているの
で、外気温度等の環境条件によっては、初期開度が大き
過ぎる場合があるという問題があった。
However, in the above-described air conditioner, the stored data of the initial opening of the electric expansion valve can be rewritten to the opening during stable operation. However, the predetermined time is constant. Since the initial opening is fixed to the initial opening, there is a problem that the initial opening may be too large depending on environmental conditions such as the outside air temperature.

【0005】つまり、例えば、低外気時における暖房運
転の起動時においては、室外熱交換器における液冷媒が
蒸発し難く、安定運転時の開度では大き過ぎることにな
り、室外熱交換器の出口側での冷媒が湿り過ぎになり、
液バックが生ずるという問題があった。
That is, for example, when starting the heating operation in the low outdoor air, the liquid refrigerant in the outdoor heat exchanger hardly evaporates, and the opening degree in the stable operation is too large, and the outlet of the outdoor heat exchanger is too large. Refrigerant on the side becomes too wet,
There is a problem that liquid back occurs.

【0006】また、サーモ発停のように圧縮機の起動が
何回も繰返されると、圧縮機内の潤滑油の濃度が低下
し、軸受けのメタル焼けが生ずるという問題があった。
[0006] Further, when the start of the compressor is repeated many times, such as when starting and stopping a thermostat, there is a problem that the concentration of the lubricating oil in the compressor is reduced, and metal burning of the bearing occurs.

【0007】そこで、上記電動膨張弁の初期開度を小さ
く設定すると、低圧冷媒圧力が低下し、保護装置が作動
してリトライ運転を繰返すという問題がある。
Therefore, when the initial opening of the electric expansion valve is set small, there is a problem that the low-pressure refrigerant pressure decreases, the protection device operates, and the retry operation is repeated.

【0008】本発明は、斯かる点に鑑みてなされたもの
であって、暖房運転の起動時における液バックを防止
し、且つ潤滑油の濃度低下を防止すると共に、低圧冷媒
圧力の低下を防止することを目的とするものである。
SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances, and prevents a liquid back at the start of a heating operation, prevents a decrease in lubricating oil concentration, and prevents a decrease in low-pressure refrigerant pressure. It is intended to do so.

【0009】[0009]

【課題を解決するための手段】上記の目的を達成するた
めに、本発明が講じた手段は、膨張弁の起動開度を低圧
冷媒圧力に対応して変更するようにしたものである。
Means for Solving the Problems In order to achieve the above-mentioned object, a measure taken by the present invention is to change the starting opening of the expansion valve in accordance with the low-pressure refrigerant pressure.

【0010】具体的に、図1に示すように、請求項1に
係る発明が講じた手段は、先ず、圧縮機(21)と、熱源
側熱交換器(24)と、開度調整可能な膨張弁(25)と、
利用側熱交換器(31)とが順に接続されて閉回路の主冷
媒回路(11)が形成されている空気調和装置の運転制御
装置を対象としている。
Specifically, as shown in FIG. 1, the means adopted by the invention according to claim 1 includes a compressor (21), a heat source side heat exchanger (24), and an adjustable opening. An expansion valve (25),
It is intended for an operation control device of an air conditioner in which a use-side heat exchanger (31) is sequentially connected to form a closed circuit main refrigerant circuit (11).

【0011】そして、上記圧縮機(21)の吸込側におけ
る低圧冷媒圧力を検出する低圧検出手段(P2)と、暖房
運転の起動時に膨張弁(25)の開度を予め設定された起
動開度に制御する起動制御手段(52)とが設けられてい
る。更に、上記低圧検出手段(P2)が検出する低圧冷媒
圧力に基づいて該低圧冷媒圧力が所定圧力以上である
と、上記起動制御手段(52)が膨張弁(25)の開度を起
動開度より小さくするように閉動信号を出力すると共
に、上記低圧冷媒圧力が所定圧力より低下するに従って
上記起動制御手段(52)が膨張弁(25)の開度を大きく
するように上記低圧冷媒圧力に対応して予め設定された
所定開度に上記膨張弁(25)の開度を設定する開動信号
を出力する開度調節手段(53)が設けられている。加え
て、暖房運転の起動時から所定時間が経過すると、上記
起動制御手段(52)の起動制御を終了させる終了手段
(54)が設けられた構成としている。
A low-pressure detecting means (P2) for detecting a low-pressure refrigerant pressure on the suction side of the compressor (21), and a predetermined opening degree of opening of the expansion valve (25) when the heating operation is started. And an activation control means (52) for controlling Further, when the low-pressure refrigerant pressure is equal to or higher than a predetermined pressure based on the low-pressure refrigerant pressure detected by the low-pressure detection means (P2), the activation control means (52) sets the opening of the expansion valve (25) to the activation opening. A closing operation signal is output so as to make the pressure smaller, and as the low-pressure refrigerant pressure falls below a predetermined pressure, the activation control means (52) increases the opening degree of the expansion valve (25) to the low-pressure refrigerant pressure. Correspondingly preset
An opening adjusting means (53) for outputting an opening signal for setting the opening of the expansion valve (25) to a predetermined opening is provided. In addition, an end means (54) for ending the start control of the start control means (52) when a predetermined time has elapsed from the start of the heating operation is provided.

【0012】また、請求項2に係る発明が講じた手段
は、請求項1の発明における終了手段(54)に代えて、
暖房運転時の熱源側熱交換器(24)における冷媒の過熱
度を検出する過熱度検出手段(55)と、該過熱度検出手
段(55)が検出した過熱度が所定温度になると、起動制
御手段(52)の起動制御を終了させる終了手段(54a)
とが設けられた構成としている。
Further, the means adopted by the invention according to claim 2 is different from the termination means (54) in the invention according to claim 1 in that
Superheat detection means (55) for detecting the degree of superheat of the refrigerant in the heat source side heat exchanger (24) during the heating operation, and starting control when the superheat detected by the superheat detection means (55) reaches a predetermined temperature. Ending means (54a) for ending the start control of the means (52)
Are provided.

【0013】また、請求項3に係る発明が講じた手段
は、請求項1の発明における終了手段(54)に代えて、
圧縮機(21)内の潤滑油温度を検出する油温検出手段
(Th9)と、該油温検出手段(Th9)が検出した潤滑油温
度が所定温度になると、起動制御手段(52)の起動制御
を終了させる終了手段(54b)とが設けられた構成とし
ている。
Further, the means adopted by the invention according to claim 3 is different from the termination means (54) in the invention according to claim 1 in that
Oil temperature detecting means (Th9) for detecting the lubricating oil temperature in the compressor (21), and activation of the starting control means (52) when the lubricating oil temperature detected by the oil temperature detecting means (Th9) reaches a predetermined temperature. A ending means (54b) for ending the control is provided.

【0014】また、請求項4に係る発明が講じた手段
は、請求項1の発明における終了手段(54)に代えて、
暖房運転時の熱源側熱交換器(24)における冷媒の過熱
度を検出する過熱度検出手段(55)と、圧縮機(21)内
の潤滑油温度を検出する油温検出手段(Th9)と、上記
過熱度検出手段(55)が検出した過熱度が所定温度にな
り、且つ上記油温検出手段(Th9)が検出した潤滑油温
度が所定温度になると、起動制御手段(52)の起動制御
を終了させる終了手段(54c)とが設けられた構成とし
ている。
Further, the means adopted by the invention according to claim 4 is different from the termination means (54) in the invention according to claim 1 in that
A superheat degree detecting means (55) for detecting a superheat degree of the refrigerant in the heat source side heat exchanger (24) during the heating operation; and an oil temperature detecting means (Th9) for detecting a lubricating oil temperature in the compressor (21). When the superheat degree detected by the superheat degree detection means (55) reaches a predetermined temperature and the lubricating oil temperature detected by the oil temperature detection means (Th9) reaches a predetermined temperature, the start control of the start control means (52) And ending means (54c) for ending the processing.

【0015】また、請求項5に係る発明が講じた手段
は、請求項1の発明における終了手段(54)に代えて、
圧縮機(21)の吐出管温度を検出する吐出管温度検出手
段(Th4)と、該吐出管温度検出手段(Th4)が検出した
吐出管温度が所定温度になると、起動制御手段(52)の
起動制御を終了させる終了手段(54d)とが設けられた
構成としている。
[0015] Further, the means taken by the invention according to claim 5 is different from the end means (54) in the invention according to claim 1 in that
A discharge pipe temperature detecting means (Th4) for detecting a discharge pipe temperature of the compressor (21); and a start control means (52) for detecting that the discharge pipe temperature detected by the discharge pipe temperature detecting means (Th4) has reached a predetermined temperature. Ending means (54d) for ending the start control is provided.

【0016】[0016]

【作用】上記の構成により、請求項1に係る発明では、
先ず、暖房運転がスタートすると、圧縮機(21)を起動
する一方、起動制御手段(52)が膨張弁(25)を起動開
度に制御する。更に、開度調節手段(53)は、低圧検出
手段(P2)の検出信号を受けて低圧冷媒圧力が低いか否
かを判別し、低圧冷媒圧力が所定の低圧であると、上記
起動制御手段(52)が膨張弁(25)の開度を小さくする
ように閉動信号を出力することになる。
According to the above construction, according to the first aspect of the present invention,
First, when the heating operation is started, the compressor (21) is started, while the start control means (52) controls the expansion valve (25) to the start opening degree. Further, the opening degree adjusting means (53) receives the detection signal of the low pressure detecting means (P2) and determines whether or not the low pressure refrigerant pressure is low. If the low pressure refrigerant pressure is a predetermined low pressure, the start control means (52) outputs the closing signal so as to reduce the opening of the expansion valve (25).

【0017】その後、上記低圧側圧力が更に低下する
と、開度調節手段(53)は、上記起動制御手段(52)が
膨張弁(25)の開度を大きくするように上記低圧冷媒圧
力に対応して予め設定された所定開度に上記膨張弁(2
5)の開度を設定する開動信号を出力する。つまり、低
圧側圧力が低下或いは上昇するに従って膨張弁(25)の
開度を起動開度より大きく或いは小さくする。
Thereafter, when the low pressure side pressure further decreases, the opening control means (53) controls the low pressure refrigerant pressure so that the activation control means (52) increases the opening of the expansion valve (25).
The expansion valve (2
5) Output the opening signal to set the opening . That is, as the low pressure side pressure decreases or increases, the opening of the expansion valve (25) is made larger or smaller than the starting opening.

【0018】続いて、上記起動時から所定時間が経過す
ると、終了手段(54)が起動制御手段(52)に終了信号
を出力し、膨張弁(25)の起動制御を終了して過熱度制
御等の通常制御を行うことになる。
Subsequently, when a predetermined time elapses from the start, the end means (54) outputs an end signal to the start control means (52), ends the start control of the expansion valve (25), and controls the degree of superheat. And the like.

【0019】また、請求項2に係る発明では、熱源側熱
交換器(24)における冷媒の過熱度が所定温度になる
と、終了手段(54a)が起動制御手段(52)に終了信号
を出力し、膨張弁(25)の起動制御を終了し、また、請
求項3に係る発明では、圧縮機(21)内の油温が所定温
度になると、終了手段(54b)が起動制御手段(52)に
終了信号を出力し、膨張弁(25)の起動制御を終了し、
また、請求項4に係る発明では、熱源側熱交換器(24)
における冷媒の過熱度と圧縮機(21)内の油温とが所定
温度になると、終了手段(54c)が起動制御手段(52)
に終了信号を出力し、膨張弁(25)の起動制御を終了
し、また、請求項5に係る発明では、圧縮機(21)の吐
出管温度が所定温度になると、終了手段(54d)が起動
制御手段(52)に終了信号を出力し、膨張弁(25)の起
動制御を終了することになる。
Further, in the invention according to claim 2, when the degree of superheat of the refrigerant in the heat source side heat exchanger (24) reaches a predetermined temperature, the termination means (54a) outputs a termination signal to the activation control means (52). The start control of the expansion valve (25) is terminated, and in the invention according to claim 3, when the oil temperature in the compressor (21) reaches a predetermined temperature, the end means (54b) is activated by the start control means (52). Output the end signal to end the expansion valve (25) start control,
In the invention according to claim 4, the heat source side heat exchanger (24)
When the degree of superheat of the refrigerant and the oil temperature in the compressor (21) reach a predetermined temperature, the termination means (54c) is activated by the activation control means (52).
To output the end signal to end the start control of the expansion valve (25). In the invention according to claim 5, when the discharge pipe temperature of the compressor (21) reaches a predetermined temperature, the end means (54d) An end signal is output to the activation control means (52), and the activation control of the expansion valve (25) is terminated.

【0020】[0020]

【発明の効果】従って、請求項1に係る発明によれば、
低圧冷媒圧力に応じて起動時の膨張弁(25)の起動開度
を小さくするようにしたゝめに、例えば、低外気時にお
ける暖房運転の起動時においては、室外熱交換器におけ
る液冷媒が蒸発し難くい場合でも、熱源側熱交換器(2
4)の出口側におけるで冷媒の湿り過ぎを防止すること
ができ、液バックを確実に防止することができる。
Therefore, according to the first aspect of the present invention,
In order to reduce the opening degree of the expansion valve (25) at the time of startup according to the low-pressure refrigerant pressure, for example, at the time of starting the heating operation at the time of low outside air, the liquid refrigerant in the outdoor heat exchanger is discharged. Even when evaporation is difficult, the heat source side heat exchanger (2
In the outlet side of 4), it is possible to prevent the refrigerant from becoming too wet, and it is possible to reliably prevent liquid back.

【0021】また、液バックを防止することができるこ
とから、圧縮機(21)内の潤滑油の濃度が低下すること
がなく、軸受けのメタル部への給油を確実に確保するこ
とができる。
Further, since the liquid back can be prevented, the lubricating oil concentration in the compressor (21) does not decrease, and the lubrication of the metal portion of the bearing can be ensured.

【0022】更に、上記膨張弁(25)の起動開度を調整
するので、低圧冷媒圧力が低下し過ぎると、開度を大き
くすることから、保護装置が作動することがなく、リト
ライ運転を繰返しを確実に防止することができる。
Further, since the starting opening of the expansion valve (25) is adjusted, if the low-pressure refrigerant pressure becomes too low, the opening is increased, so that the protection device does not operate and the retry operation is repeated. Can be reliably prevented.

【0023】また、請求項2に係る発明によれば、熱源
側熱交換器(24)の過熱度に基づいて膨張弁(25)の起
動制御を終了するので、通常の膨張弁制御を迅速に開始
することができる。
Further, according to the second aspect of the present invention, since the startup control of the expansion valve (25) is terminated based on the degree of superheat of the heat source side heat exchanger (24), the normal expansion valve control can be quickly performed. You can start.

【0024】また、請求項3に係る発明によれば、圧縮
機(21)内の油温に基づいて膨張弁(25)の起動制御を
終了するので、通常制御を迅速に開始することができる
と共に、油温を検出するのみであることから、少ない検
出手段でもって起動制御を行うことができる。
According to the third aspect of the present invention, since the start control of the expansion valve (25) is terminated based on the oil temperature in the compressor (21), the normal control can be started quickly. At the same time, since only the oil temperature is detected, the startup control can be performed with a small number of detecting means.

【0025】また、請求項4に係る発明によれば、熱源
側熱交換器(24)の過熱度と圧縮機(21)内の油温に基
づいて膨張弁(25)の起動制御を終了するので、通常制
御を迅速に開始することができると共に、液バックの防
止を確実に行うことができる。
According to the fourth aspect of the invention, the activation control of the expansion valve (25) is terminated based on the degree of superheat of the heat source side heat exchanger (24) and the oil temperature in the compressor (21). Therefore, the normal control can be started quickly and the liquid back can be reliably prevented.

【0026】また、請求項5に係る発明によれば、圧縮
機(21)の吐出管温度に基づいて膨張弁(25)の起動制
御を終了するので、通常制御を迅速に開始することがで
きると共に、他の制御にも使用できる吐出管検出手段を
利用することができることから、部品点数の増加を防止
することができる。
According to the fifth aspect of the present invention, since the start control of the expansion valve (25) is terminated based on the discharge pipe temperature of the compressor (21), the normal control can be started quickly. At the same time, since the discharge pipe detecting means that can be used for other controls can be used, an increase in the number of parts can be prevented.

【0027】[0027]

【実施例】以下、本発明の実施例について図面に基づい
て詳細に説明する。
Embodiments of the present invention will be described below in detail with reference to the drawings.

【0028】図2は、本発明に係る空気調和装置(1)
における室外ユニット(2)及び室内ユニット(3)の冷
媒配管系統を示している。
FIG. 2 shows an air conditioner (1) according to the present invention.
2 shows the refrigerant piping system of the outdoor unit (2) and the indoor unit (3).

【0029】該室外ユニット(2)は、出力周波数を3
0〜116Hzの範囲で4〜10Hz毎に可変に切換えられ
るインバータ(2a)により容量が調整される圧縮機(2
1)と、該圧縮機(21)から吐出されるガス中の油を分
離する油分離器(22)と、冷房運転時には図中実線の如
く切換わり暖房運転時には図中破線の如く切換わる四路
切換弁(23)と、冷房運転時に凝縮器、暖房運転時に蒸
発器となる熱源側熱交換器としての室外熱交換器(24)
及び該室外熱交換器(24)に付設された室外ファン(2
F)と、冷房運転時には冷媒流量を調節し、暖房運転時
には冷媒の絞り作用を行う室外電動膨脹弁(25)と、液
化した冷媒を貯蔵するレシーバ(26)と、アキュムレー
タ(27)とが主要機器として内蔵されていて、上記圧縮
機(21)及び室外熱交換器(24)等の各機器はそれぞれ
冷媒配管(4)で冷媒の流通可能に接続されている。
The outdoor unit (2) has an output frequency of 3
A compressor (2) whose capacity is adjusted by an inverter (2a) variably switched every 4 to 10 Hz in a range of 0 to 116 Hz.
1), an oil separator (22) for separating the oil in the gas discharged from the compressor (21), and a switch for switching as shown by the solid line in the cooling operation and a switch as shown by the broken line in the heating operation for the heating operation. Route switching valve (23) and outdoor heat exchanger (24) as a heat source side heat exchanger that becomes a condenser during cooling operation and an evaporator during heating operation
And an outdoor fan (2) attached to the outdoor heat exchanger (24).
F), an outdoor electric expansion valve (25) that regulates the flow rate of the refrigerant during the cooling operation and throttles the refrigerant during the heating operation, a receiver (26) that stores the liquefied refrigerant, and an accumulator (27). Each device such as the compressor (21) and the outdoor heat exchanger (24) is built in as a device, and connected to the refrigerant pipe (4) so that the refrigerant can flow therethrough.

【0030】また、上記室内ユニット(3)は、冷房運
転時には蒸発器、暖房運転時には凝縮器となる利用側熱
交換器としての室内熱交換器(31)及び該室内熱交換器
(31)に付設された室内ファン(3F)を備え、該室内熱
交換器(31)に接続された冷媒配管(4)の液管側に
は、暖房運転時に冷媒流量を調節し、冷房運転時に冷媒
の絞り作用を行う室内電動膨張弁(32)が設けられてい
る。
The indoor unit (3) includes an indoor heat exchanger (31) serving as a use side heat exchanger serving as an evaporator during cooling operation and a condenser during heating operation, and the indoor heat exchanger (31). An indoor fan (3F) is provided, and the refrigerant pipe side (4) connected to the indoor heat exchanger (31) has a liquid pipe side for adjusting the refrigerant flow rate during the heating operation and restricting the refrigerant flow during the cooling operation. An electrically operated indoor expansion valve (32) is provided.

【0031】そして、上記室外ユニット(2)及び室内
ユニット(3)は、冷媒配管(4)である連絡配管(41)
によって接続され、上記圧縮機(21)、室外熱交換器
(24)及び室内熱交換器(31)等の各機器はそれぞれ冷
媒配管(4)によって閉回路に接続されて、室外空気と
の熱交換により得た熱を室内空気に放出するようにした
主冷媒回路(11)が構成されている。
The outdoor unit (2) and the indoor unit (3) are connected to a communication pipe (41) which is a refrigerant pipe (4).
The compressor (21), the outdoor heat exchanger (24), and the indoor heat exchanger (31) are connected to each other by a refrigerant pipe (4) in a closed circuit, and the heat from the outdoor air is A main refrigerant circuit (11) configured to release heat obtained by the exchange to room air is provided.

【0032】また、(42)は、室外熱交換器(24)をバ
イパスする暖房過負荷制御用バイパス路であって、該バ
イパス路(42)には、室外熱交換器(24)と共通の空気
通路に設置された補助熱交換器(4a)と、キャピラリチ
ューブ(4b)と、冷媒の高圧時に開作動する補助開閉弁
(4c)とが順次直列に且つ室外熱交換器(24)に対して
並列に接続されており、冷房運転時には常時、暖房運転
時には高圧の過上昇時に、上記補助開閉弁(4c)がオン
して開状態になり、吐出ガスの一部を主冷媒回路(11)
から暖房過負荷制御用バイパス路(42)にバイパスする
ようにしている。この暖房過負荷制御用バイパス路(4
2)は、吐出ガスの一部を補助熱交換器(4a)で凝縮さ
せて室外熱交換器(24)の能力を補助すると共に、キャ
ピラリチューブ(4b)で室外熱交換器(24)側の圧力損
失とのバランスを取るようになされている。
A heating overload control bypass path (42) bypasses the outdoor heat exchanger (24). The bypass path (42) has a common path with the outdoor heat exchanger (24). An auxiliary heat exchanger (4a) installed in the air passage, a capillary tube (4b), and an auxiliary opening / closing valve (4c) that opens when the refrigerant is at a high pressure are sequentially connected in series to the outdoor heat exchanger (24). The auxiliary on-off valve (4c) is turned on to open at all times during cooling operation and when the high pressure excessively rises during heating operation, and a part of the discharge gas is transferred to the main refrigerant circuit (11).
From the heating overload control bypass path (42). This bypass path for heating overload control (4
2) The auxiliary heat exchanger (4a) condenses a part of the discharged gas to assist the capacity of the outdoor heat exchanger (24), and the capillary tube (4b) to the side of the outdoor heat exchanger (24). It is designed to balance pressure loss.

【0033】(43)は、冷暖房運転時に圧縮機(21)の
吸入側に液冷媒を注入して吸入ガスの過熱度を調節する
ためのリキッドインジェクションバイパス路であって、
圧縮機(21)の吐出管温度の過上昇時に開かれるインジ
ェクション弁(4d)と、キャピラリチューブ(4e)とが
介設されている。
(43) a liquid injection bypass for injecting liquid refrigerant into the suction side of the compressor (21) during cooling and heating operation to adjust the degree of superheat of the suction gas,
An injection valve (4d) that opens when the discharge pipe temperature of the compressor (21) rises excessively, and a capillary tube (4e) are interposed.

【0034】(44)は、キャピラリチューブ(4f)を介
して上記油分離器(22)から圧縮機(21)に潤滑油を戻
すための油戻し管である。
An oil return pipe (44) returns lubricating oil from the oil separator (22) to the compressor (21) via the capillary tube (4f).

【0035】(45)は、圧縮機(21)の吐出側冷媒配管
(4)と吸入側冷媒配管(4)とを接続する均圧ホットガ
スバイパス路であって、サーモオフ状態等による圧縮機
(21)の停止時及び再起動前に一定時間だけ開作動する
均圧弁(4g)及びキャピラリチューブ(4h)が介設され
ている。
Reference numeral (45) denotes a pressure equalizing hot gas bypass connecting the discharge side refrigerant pipe (4) and the suction side refrigerant pipe (4) of the compressor (21). A pressure equalizing valve (4g) and a capillary tube (4h) that open for a certain period of time before stopping and restarting in 21) are provided.

【0036】(46)は、上記レシーバ(26)と均圧ホッ
トガスバイパス路(45)との間に接続された均圧路であ
って、一端はレシーバ(26)の上端面に、他端が上記均
圧ホットガスバイパス路(45)の均圧弁(4g)の上流側
に接続されている。この均圧路(46)は、レシーバ(2
6)から均圧ホットガスバイパス路(45)へ向う冷媒流
通のみを許容する逆止弁(4i)が介設され、均圧弁(4
g)が開放された状態で、レシーバ(26)内の上層部の
ガス冷媒が均圧ホットガスバイパス路(45)、つまり、
液冷媒が導入されることなしに圧縮機(21)の吸入側に
導入可能にしている。
(46) is a pressure equalizing path connected between the receiver (26) and the pressure equalizing hot gas bypass path (45), one end of which is connected to the upper end face of the receiver (26) and the other end thereof. Is connected to the upstream side of the equalizing valve (4g) of the equalizing hot gas bypass passage (45). This pressure equalizing path (46) is connected to the receiver (2
A check valve (4i) that allows only refrigerant flow from 6) to the pressure equalizing hot gas bypass passage (45) is provided.
g) is opened, and the gas refrigerant in the upper layer in the receiver (26) is discharged to the equalizing hot gas bypass passage (45),
The liquid refrigerant can be introduced to the suction side of the compressor (21) without being introduced.

【0037】また、(2b)は、圧縮機(21)の吸入側の
吸入冷媒と冷媒配管(4)の液管中の液冷媒との熱交換
により吸入冷媒を冷却させて、連絡配管(41)における
冷媒の過熱度の上昇を補償するための吸入管熱交換器で
ある。
(2b) cools the suction refrigerant by heat exchange between the suction refrigerant on the suction side of the compressor (21) and the liquid refrigerant in the liquid pipe of the refrigerant pipe (4), and connects the communication pipe (41). ) Is a suction pipe heat exchanger for compensating for an increase in the degree of superheat of the refrigerant in the above.

【0038】また、上記空気調和装置(1)には、多く
のセンサ類が配置されていて、(Th1)は、室内の吸込
空気温度である室内温度T1を検出する室温センサ、(Th
2)及び(Th3)は、それぞれ室内熱交換器(31)の液側
及びガス側冷媒配管(4)における液冷媒温度T2及びガ
ス冷媒温度T3を検出する室内液温センサ及び室内ガス温
センサ、(Th4)は、圧縮機(21)の吐出管温度T4を検
出する吐出管センサ、(Th5)は、室外熱交換器(24)
の液冷媒温度T5からデフロスト等を検出する室外液温セ
ンサ、(Th6)は、上記吸入管熱交換器(2b)の下流側
の吸入冷媒配管(4)に配置されて圧縮機(21)の吸入
管温度T6を検出する吸入管センサ、(Th7)は、室外熱
交換器(24)の空気吸込口に配置されて室外の吸込空気
温度である外気温度T7を検出する外気温センサ、(P1)
は、圧縮機(21)の吐出側に配設されて主冷媒回路(1
1)の高圧側圧力を検出する高圧センサ、(P2)は、圧
縮機(21)の吸入側に配設されて主冷媒回路(11)の低
圧側圧力を検出する低圧検出手段である低圧センサ、
(HPS)は、圧縮機(21)の吐出側に配設された圧縮機
(21)の保護用高圧圧力開閉器である。
In the air conditioner (1), many sensors are arranged. (Th1) is a room temperature sensor for detecting a room temperature T1, which is a room intake air temperature;
2) and (Th3) are an indoor liquid temperature sensor and an indoor gas temperature sensor for detecting the liquid refrigerant temperature T2 and the gas refrigerant temperature T3 in the liquid-side and gas-side refrigerant pipes (4) of the indoor heat exchanger (31), respectively. (Th4) is a discharge pipe sensor that detects the discharge pipe temperature T4 of the compressor (21), and (Th5) is an outdoor heat exchanger (24)
An outdoor liquid temperature sensor (Th6) for detecting defrost or the like from the liquid refrigerant temperature T5 of the compressor (21) is disposed in the suction refrigerant pipe (4) downstream of the suction pipe heat exchanger (2b). An intake pipe sensor that detects the intake pipe temperature T6, (Th7) is an outdoor air temperature sensor that is disposed at the air inlet of the outdoor heat exchanger (24) and detects the outdoor air temperature T7 that is the outdoor intake air temperature, (P1 )
Is disposed on the discharge side of the compressor (21) and is connected to the main refrigerant circuit (1).
The high-pressure sensor 1) detects the high-pressure side pressure, and the low-pressure sensor (P2) is a low-pressure sensor disposed on the suction side of the compressor (21) and detecting the low-pressure side pressure of the main refrigerant circuit (11). ,
(HPS) is a protective high-pressure switch for the compressor (21) disposed on the discharge side of the compressor (21).

【0039】そして、上記各電動膨張弁(25,32)及び
センサ(Th1〜Th7)等は、コントロールユニット(5)
に信号線で接続され、該コントロールユニット(5)
は、各センサ(Th1〜Th7)等の検出信号を受けて各電動
膨張弁(25,32)等の開閉制御や圧縮機(21)の容量制
御を行うようになっている。
Each of the electric expansion valves (25, 32) and the sensors (Th1 to Th7) are connected to the control unit (5).
To the control unit (5)
Receives the detection signals from the sensors (Th1 to Th7) and controls the opening and closing of the electric expansion valves (25, 32) and the capacity of the compressor (21).

【0040】また、上記コントロールユニット(15)に
は、本発明の特徴として膨張弁制御手段(51)と起動制
御手段(52)と開度調節手段(53)と終了手段(54)と
が設けられている。
The control unit (15) is provided with expansion valve control means (51), activation control means (52), opening degree adjustment means (53), and termination means (54) as features of the present invention. Have been.

【0041】該膨張弁制御手段(51)は、暖房運転時に
おいて室外熱交換器(24)の出口側の冷媒過熱度が一定
値になるように室外電動膨張弁(25)の開度をPI制御
(比例・積分制御)している。
The expansion valve control means (51) adjusts the opening degree of the outdoor electric expansion valve (25) so that the degree of superheat of the refrigerant at the outlet of the outdoor heat exchanger (24) becomes constant during the heating operation. Control (proportional / integral control).

【0042】上記起動制御手段(52)は、暖房運転の起
動時に室外電動膨張弁(25)の開度を予め設定された固
定開度EV(Ft)に定数aを乗算した起動開度EV(Ft)・
aに制御するように構成されており、この固定開度EV
(Ft)は、圧縮機(21)の運転周波数に対応して予め設
定されている。
The start control means (52) is configured to multiply the opening of the outdoor electric expansion valve (25) by a constant a to a preset fixed opening EV (Ft) at the time of starting the heating operation, and to start the opening EV (F). Ft) ・
The fixed opening EV
(Ft) is set in advance corresponding to the operating frequency of the compressor (21).

【0043】また、上記開度調節手段(53)は、低圧セ
ンサ(P2)が検出する低圧側圧力(低圧冷媒圧力)に基
づいて該低圧側圧力が所定の圧力以上であると、上記起
動制御手段(52)が室外電動膨張弁(25)の開度を起動
開度より小さくするように閉動信号を出力すると共に、
上記低圧側圧力が所定の圧力より低下するに従って上記
起動制御手段(52)が室外電動膨張弁(25)の開度を大
きくするように開度信号を出力するものである。
When the low pressure side pressure is equal to or higher than a predetermined pressure based on the low pressure side pressure (low pressure refrigerant pressure) detected by the low pressure sensor (P2), the opening control means (53) performs the start control. The means (52) outputs a closing signal so that the opening of the outdoor electric expansion valve (25) is smaller than the starting opening,
The activation control means (52) outputs an opening signal to increase the opening of the outdoor electric expansion valve (25) as the low pressure side pressure falls below a predetermined pressure.

【0044】具体的、該開度調節手段(53)は、低圧側
圧力が3kg/cm2以上であると定数aを0に、低圧側圧
力が2kg/cm2以上で3kg/cm2未満であると定数aを
0.3に、低圧側圧力が1kg/cm2より大きく2kg/cm2
未満であると定数aを0.5に、低圧側圧力が1kg/cm
2以下であると定数aを2に設定するように起動制御手
段(52)に閉動信号又は開度信号を出力するように構成
されている。
Specifically, the opening adjusting means (53) sets the constant a to 0 when the low pressure side pressure is 3 kg / cm 2 or more, and sets the constant a to 0 when the low pressure side pressure is 2 kg / cm 2 or more and less than 3 kg / cm 2 . there the constants a to 0.3, large 2 kg / cm 2 from the low-pressure side pressure is 1 kg / cm 2
If it is less than 1, the constant a is set to 0.5, and the low pressure side pressure is set to 1 kg / cm.
If it is less than 2 , a closing signal or an opening signal is outputted to the activation control means (52) so that the constant a is set to 2.

【0045】上記終了手段(54)は、暖房運転の起動時
から所定時間が経過すると、上記起動制御手段(52)の
起動制御を終了させるように構成され、例えば、起動か
ら圧縮機(21)を低周波数で起動するソフト起動時間で
ある60秒と、該ソフト起動時間後の制御時間である180
秒とを加算した240秒が経過すると終了信号を出力する
ように構成されている。
The termination means (54) is configured to terminate the activation control of the activation control means (52) when a predetermined time has elapsed from the activation of the heating operation. At a low frequency, a soft start time of 60 seconds, and a control time after the soft start time of 180 seconds.
It is configured to output an end signal when 240 seconds obtained by adding seconds have elapsed.

【0046】次に、上述空気調和装置(1)の運転動作
について説明する。
Next, the operation of the air conditioner (1) will be described.

【0047】図2において、空気調和装置(1)の冷房
運転時には、四路切換弁(23)が図中実線側に切換わ
り、補助熱交換器(4a)の補助開閉弁(4c)が常時開い
て、圧縮機(21)で圧縮された冷媒が、室外熱交換器
(24)及び補助熱交換器(4a)で凝縮され、連絡配管
(41)を経て室内ユニット(3)に送られる。そして、
この室内ユニット(3)では、液冷媒が、室内電動膨張
弁(32)で減圧され、室内熱交換器(31)で蒸発した
後、連絡配管(41)を経て室外ユニット(2)にガス状
態で戻り、圧縮機(21)に吸入されるように循環する。
つまり、液冷媒が室内熱交換器(31)において室内空気
との間で熱交換を行って蒸発することにより室内空気を
冷却することになる。
In FIG. 2, during the cooling operation of the air conditioner (1), the four-way switching valve (23) is switched to the solid line side in the drawing, and the auxiliary opening / closing valve (4c) of the auxiliary heat exchanger (4a) is always on. When opened, the refrigerant compressed by the compressor (21) is condensed by the outdoor heat exchanger (24) and the auxiliary heat exchanger (4a) and sent to the indoor unit (3) via the communication pipe (41). And
In this indoor unit (3), the liquid refrigerant is decompressed by the indoor electric expansion valve (32), evaporated in the indoor heat exchanger (31), and then communicated to the outdoor unit (2) via the connecting pipe (41). And circulates so as to be sucked into the compressor (21).
That is, the liquid refrigerant cools the indoor air by performing heat exchange with the indoor air in the indoor heat exchanger (31) and evaporating.

【0048】また、暖房運転時には、四路切換弁(23)
が図中破線側に切換わり、冷媒の流れは上記冷房運転時
と逆となって、圧縮機(21)で圧縮された冷媒が、室内
熱交換器(31)で凝縮され、液状態で室外ユニット
(2)に流れ、室外電動膨張弁(25)により減圧され、
室外熱交換器(24)で蒸発した後、圧縮機(21)に戻る
ように循環する。つまり、ガス冷媒が室内熱交換器(3
1)において室内空気との間で熱交換を行って凝縮する
ことにより室内空気を加熱することになる。
During the heating operation, the four-way switching valve (23)
Is switched to the broken line side in the drawing, and the flow of the refrigerant is opposite to that during the cooling operation, and the refrigerant compressed by the compressor (21) is condensed by the indoor heat exchanger (31), and the refrigerant is discharged in a liquid state. It flows to the unit (2) and is decompressed by the outdoor electric expansion valve (25).
After evaporating in the outdoor heat exchanger (24), it circulates back to the compressor (21). That is, the gas refrigerant is supplied to the indoor heat exchanger (3
In 1), the indoor air is heated by performing heat exchange with the indoor air and condensing it.

【0049】そこで、上記暖房運転の起動時における室
外電動膨張弁(25)の開度制御について図3に示す制御
フローに基づき説明する。
The opening control of the outdoor electric expansion valve (25) at the time of starting the heating operation will be described with reference to the control flow shown in FIG.

【0050】先ず、暖房運転スイッチ等が投入されて暖
房運転がスタートすると、ステップST1において、圧縮
機(21)を起動することになり、例えば、60秒間は、通
常運転時における圧縮機(21)の運転周波数より低い低
周波数で圧縮機(21)をソフト起動する。その後、ステ
ップST1からステップST2に移り、暖房運転か否かを判
定し、暖房運転でない場合には、該ステップST2の判定
がNOとなってステップST3に移り、冷房運転モジュー
ルを実行することになる。
First, when the heating operation switch or the like is turned on to start the heating operation, in step ST1, the compressor (21) is started. For example, for 60 seconds, the compressor (21) in the normal operation is started. The compressor (21) is soft-started at a low frequency lower than the operating frequency of. Thereafter, the process proceeds from step ST1 to step ST2 to determine whether or not the heating operation is performed. If the heating operation is not performed, the determination in step ST2 is NO and the process proceeds to step ST3 to execute the cooling operation module. .

【0051】一方、上記ステップST2において、現状の
ように暖房運転であると、判定がYESとなってステッ
プST4に移り、ソフト起動時間の60秒が経過するまで起
動制御手段(52)が固定開度EV(Ft)に定数aを乗算し
た起動開度EV(Ft)・aに室外電動膨張弁(25)を制御
する。更に、開度調節手段(53)は、低圧センサ(P2)
の検出信号を受けて低圧側圧力が低いか否かを判別し、
低圧側圧力が3kg/cm2以上の低圧であると、上記起動
制御手段(52)が定数aを0に設定するように閉動信号
を出力することになる。つまり、該起動制御手段(52)
は、低圧側圧力が低い場合、室外電動膨張弁(25)を全
閉に制御して液バックを防止することになる。
On the other hand, if the heating operation is currently performed in step ST2, the determination is YES and the process moves to step ST4, where the start control means (52) is fixedly opened until the soft start time of 60 seconds elapses. The outdoor electric expansion valve (25) is controlled by the start opening degree EV (Ft) · a obtained by multiplying the degree EV (Ft) by a constant a. Further, the opening adjustment means (53) is provided with a low-pressure sensor (P2).
, To determine whether the low pressure side pressure is low,
If the low pressure side pressure is a low pressure of 3 kg / cm 2 or more, the activation control means (52) outputs a closing signal so that the constant a is set to 0. That is, the activation control means (52)
When the low-pressure side pressure is low, the outdoor electric expansion valve (25) is controlled to be fully closed to prevent liquid back.

【0052】その後、上記低圧側圧力が低下し過ぎ、2
kg/cm2以上で3kg/cm2未満になると、開度調節手段
(53)は、上記起動制御手段(52)が定数aを0.3に
設定するように開動信号を出力し、また、上記低圧側圧
力が低下し、1kg/cm2より大きく2kg/cm2未満になる
と、開度調節手段(53)は、上記起動制御手段(52)が
定数aを0.5に設定するように開動信号を出力し、更
に、上記低圧側圧力が低下し、1kg/cm2以下に低下す
ると、開度調節手段(53)は、上記起動制御手段が定数
aを2に設定するように開動信号を出力することにな
る。つまり、室外電動膨張弁(25)を全閉した後、低圧
側圧力が低下或いは上昇するに従って室外電動膨張弁
(25)の開度を大きく或いは小さくし、1kg/cm2以下
に低下すると、圧縮機(21)の低圧保護のために室外電
動膨張弁(25)を大きく開くことになる。その際、低圧
側圧力は低いので液バックは少ないことになる。
Thereafter, the low pressure side pressure is excessively reduced.
When kg / cm 2 or more and less than 3 kg / cm 2 , the opening degree adjusting means (53) outputs an opening movement signal so that the activation control means (52) sets the constant a to 0.3. It reduces the above low-pressure side pressure, at a greater than 2 kg / cm 2 than 1 kg / cm 2, the opening control means (53), as the activation control means (52) sets the constant a 0.5 When the low-pressure side pressure is reduced to 1 kg / cm 2 or less, the opening adjustment means (53) outputs the opening signal so that the activation control means sets the constant a to 2. Will be output. That is, after closed outdoor electric expansion valve (25) all, by increasing or decreasing the opening degree of the outdoor electric expansion valve (25) in accordance with the low-pressure side pressure drops or rises and falls 1 kg / cm 2 or less, compression The outdoor electric expansion valve (25) is greatly opened for low pressure protection of the machine (21). At that time, since the low pressure side pressure is low, the liquid back is small.

【0053】続いて、上記ソフト起動時間が経過する
と、上記ステップST4からステップST5に移り、制御時
間である180秒のタイマをセットしてステップST6に移
ることになる。そして、このタイマがタイムアップする
まで上記ステップST4と同様に室外電動膨張弁(25)を
制御し、低圧側圧力が低下或いは上昇するに従って室外
電動膨張弁(25)の開度を大きく或いは小さくする。
Subsequently, after the elapse of the software activation time, the process proceeds from step ST4 to step ST5, where a timer of 180 seconds as a control time is set, and the process proceeds to step ST6. The outdoor electric expansion valve (25) is controlled until the timer expires in the same manner as in step ST4, and the opening degree of the outdoor electric expansion valve (25) is increased or decreased as the low pressure side pressure decreases or increases. .

【0054】その後、上記タイマがタイムアップして18
0秒の制御時間が経過すると、終了手段(54)が終了信
号を起動制御手段(52)に出力し、起動制御を終了して
ステップST7に移り、膨張弁制御手段(51)が室外電動
膨張弁(25)を通常制御であるPI制御することにな
る。
Thereafter, the timer expires and 18
When the control time of 0 second has elapsed, the termination means (54) outputs a termination signal to the activation control means (52), terminates the activation control, and proceeds to step ST7, where the expansion valve control means (51) controls the outdoor electric expansion. The valve (25) is controlled by PI, which is the normal control.

【0055】従って、本実施例によれば、低圧冷媒圧力
に応じて起動時の室外電動膨張弁(25)の起動開度を小
さくするようにしたゝめに、例えば、低外気時における
暖房運転の起動時においては、室外熱交換器(24)にお
ける液冷媒が蒸発し難くい場合でも、室外熱交換器(2
4)の出口側におけるで冷媒の湿り過ぎを防止すること
ができ、液バックを確実に防止することができる。
Therefore, according to the present embodiment, the startup opening of the outdoor electric expansion valve (25) at the time of startup is reduced in accordance with the low-pressure refrigerant pressure. When the liquid refrigerant in the outdoor heat exchanger (24) is difficult to evaporate at the start of the outdoor heat exchanger (2),
In the outlet side of 4), it is possible to prevent the refrigerant from becoming too wet, and it is possible to reliably prevent liquid back.

【0056】また、液バックを防止することができるこ
とから、圧縮機(21)内の潤滑油の濃度が低下すること
がなく、軸受けのメタル部への給油を確実に確保するこ
とができる。
Further, since the liquid back can be prevented, the lubricating oil concentration in the compressor (21) does not decrease, and the lubrication of the metal part of the bearing can be ensured.

【0057】更に、上記室外電動膨張弁(25)の起動開
度を調整するので、低圧冷媒圧力が低下し過ぎると、開
度を大きくすることから、保護装置が作動することがな
く、リトライ運転を繰返しを確実に防止することができ
る。
Further, since the starting opening degree of the outdoor electric expansion valve (25) is adjusted, if the low-pressure refrigerant pressure becomes too low, the opening degree is increased, so that the protection device does not operate and the retry operation is performed. Can be reliably prevented from being repeated.

【0058】また、請求項2に係る第2の実施例として
は、図2の一点鎖線で示すように、前実施例の終了手段
(54)に代えて、コントローラ(5)に過熱度検出手段
(55)と終了手段(54a)とを設けたものである。
According to a second embodiment of the present invention, as shown by a dashed line in FIG. 2, instead of the ending means (54) of the previous embodiment, a controller (5) is provided with a superheat degree detecting means. (55) and termination means (54a).

【0059】つまり、図2に示すように、室外熱交換器
(24)のガス側冷媒温度を検出する室外ガス温センサ
(Th8)を設け、過熱度検出手段(55)は、室外液温セ
ンサ(Th5)と室外ガス温センサ(Th8)との検出信号を
受けて室外熱交換器(24)における冷媒の過熱度を検出
するように構成されている。
That is, as shown in FIG. 2, an outdoor gas temperature sensor (Th8) for detecting the gas side refrigerant temperature of the outdoor heat exchanger (24) is provided, and the degree of superheat detection means (55) is an outdoor liquid temperature sensor. (Th5) and the detection signal of the outdoor gas temperature sensor (Th8) are configured to detect the degree of superheat of the refrigerant in the outdoor heat exchanger (24).

【0060】また、上記終了手段(54a)は、過熱度検
出手段(55)が検出した過熱度が所定温度になると、例
えば、0℃になると、上記起動制御手段(52)の起動制
御を終了させるように構成されている。
The termination means (54a) terminates the activation control of the activation control means (52) when the superheat degree detected by the superheat degree detection means (55) reaches a predetermined temperature, for example, 0 ° C. It is configured to be.

【0061】従って、本実施例係によれば、室外熱交換
器(24)の過熱度に基づいて室外電動膨張弁(25)の起
動制御を終了するので、通常制御を迅速に開始すること
ができる。
Therefore, according to the present embodiment, the start-up control of the outdoor electric expansion valve (25) is terminated based on the degree of superheat of the outdoor heat exchanger (24), so that the normal control can be started quickly. it can.

【0062】また、請求項3に係る第3の実施例として
は、図2の一点鎖線で示すように、第1の実施例におけ
る終了手段(54)に代えて、他の終了手段(54b)を設
けたものである。
According to a third embodiment of the present invention, as shown by a dashed line in FIG. 2, another ending means (54b) is used instead of the ending means (54) in the first embodiment. Is provided.

【0063】つまり、上記圧縮機(21)内の潤滑油温度
を検出する油温検出手段である油温センサ(Th9)を設
け、上記終了手段(54b)は、該油温センサ(Th9)が検
出した潤滑油温度が所定温度になると、例えば、0℃に
なると、上記起動制御手段(52)の起動制御を終了させ
るように構成されている。
That is, an oil temperature sensor (Th9) is provided as oil temperature detecting means for detecting the lubricating oil temperature in the compressor (21), and the ending means (54b) is connected to the oil temperature sensor (Th9). When the detected lubricating oil temperature reaches a predetermined temperature, for example, 0 ° C., the start control of the start control means (52) is terminated.

【0064】従って、本実施例によれば、圧縮機(21)
内の油温に基づいて室外電動膨張弁(25)の起動制御を
終了するので、通常制御を迅速に開始することができる
と共に、油温を検出するのみであることから、少ないセ
ンサでもって起動制御を行うことができる。
Therefore, according to the present embodiment, the compressor (21)
Since the start control of the outdoor electric expansion valve (25) is terminated based on the oil temperature in the inside, normal control can be started quickly, and since only the oil temperature is detected, the start is performed with a small number of sensors. Control can be performed.

【0065】また、請求項4に係る第4の実施例として
は、図2の一点鎖線で示すように、終了手段第1の実施
例における(54)に代えて、他の終了手段(54c)を設
けたものである。
According to a fourth embodiment of the present invention, as shown by a dashed line in FIG. 2, another ending means (54c) is used instead of (54) in the first embodiment. Is provided.

【0066】つまり、該終了手段(54c)は、過熱度検
出手段(55)が検出した過熱度が所定温度になり、且つ
油温センサ(Th9)が検出した潤滑油温度が所定温度に
なると、例えば、過熱度及び油温が共に0℃になると、
上記起動制御手段(52)の起動制御を終了させるように
構成されている。
That is, when the superheat degree detected by the superheat degree detection means (55) reaches the predetermined temperature and the lubricating oil temperature detected by the oil temperature sensor (Th9) reaches the predetermined temperature, the termination means (54c) For example, when the superheat and oil temperature both reach 0 ° C,
It is configured to terminate the activation control of the activation control means (52).

【0067】従って、本実施例によれば、室外熱交換器
(24)の過熱度と圧縮機(21)内の油温に基づいて室外
電動膨張弁(25)の起動制御を終了するので、通常制御
を迅速に開始することができると共に、液バックの防止
を確実に行うことができる。
Therefore, according to the present embodiment, the startup control of the outdoor electric expansion valve (25) is terminated based on the degree of superheat of the outdoor heat exchanger (24) and the oil temperature in the compressor (21). Normal control can be started promptly, and liquid back can be reliably prevented.

【0068】また、請求項5に係る第5の実施例として
は、図2の一点鎖線で示すように、第1の実施例におけ
る終了手段(54)に代えて、他の終了手段(54d)を設
けたものである。
According to a fifth embodiment of the present invention, another ending means (54d) is used instead of the ending means (54) in the first embodiment, as shown by a dashed line in FIG. Is provided.

【0069】つまり、上記吐出管センサ(Th4)が、圧
縮機(21)の吐出管温度を検出する吐出管温度検出手段
を構成する一方、上記終了手段(54d)は、吐出管セン
サ(Th4)が検出した吐出管温度が所定温度になると、
例えば、95℃になると、上記起動制御手段(52)の起動
制御を終了させるように構成されている。
That is, the discharge pipe sensor (Th4) constitutes discharge pipe temperature detecting means for detecting the discharge pipe temperature of the compressor (21), while the ending means (54d) comprises the discharge pipe sensor (Th4). When the detected discharge pipe temperature reaches a predetermined temperature,
For example, when the temperature reaches 95 ° C., the activation control of the activation control means (52) is terminated.

【0070】従って、本実施例によれば、圧縮機(21)
の吐出管温度に基づいて室外電動膨張弁(25)の起動制
御を終了するので、通常制御を迅速に開始することがで
きると共に、他の制御にも使用できる吐出管センサ(Th
4)を利用することができることから、部品点数の増加
を防止することができる。
Therefore, according to the present embodiment, the compressor (21)
Since the start control of the outdoor electric expansion valve (25) is terminated based on the discharge pipe temperature of the discharge pipe, normal control can be started quickly and the discharge pipe sensor (Th
Since 4) can be used, an increase in the number of parts can be prevented.

【0071】尚、本各実施例は、1台の室内ユニットを
有する空気調和装置について説明したが、本発明は、複
数台の室内ユニットを有するものであってもよい。
Although each of the embodiments has described the air conditioner having one indoor unit, the present invention may have a plurality of indoor units.

【0072】また、上記室外ユニットは、1台の圧縮機
(21)に限られず、2台の圧縮機(21)を備えたもので
あってもよい。
Further, the outdoor unit is not limited to one compressor (21), and may be provided with two compressors (21).

【図面の簡単な説明】[Brief description of the drawings]

【図1】本発明の構成を示すブロック図である。FIG. 1 is a block diagram showing a configuration of the present invention.

【図2】空気調和装置の冷媒配管系統を示す冷媒回路図
である。
FIG. 2 is a refrigerant circuit diagram illustrating a refrigerant piping system of the air conditioner.

【図3】室外電動膨張弁の開度制御を示す制御フロー図
である。
FIG. 3 is a control flow chart showing opening degree control of an outdoor electric expansion valve.

【符号の説明】[Explanation of symbols]

1 空気調和装置 2 室外ユニット 21 圧縮機 24 室外熱交換器(熱源側熱交換器) 25 室外電動膨張弁 3 室内ユニット 31 室内熱交換器(利用側熱交換器) 5 コントローラ 51 膨張弁制御手段 52 起動制御手段 53 開度調節手段 54,54a〜54d 終了手段 55 過熱度検出手段 Th8 室外ガス温センサ Th9 油温センサ(油温検出手段) 1 Air conditioner 2 Outdoor unit 21 Compressor 24 Outdoor heat exchanger (heat source side heat exchanger) 25 Outdoor electric expansion valve 3 Indoor unit 31 Indoor heat exchanger (use side heat exchanger) 5 Controller 51 Expansion valve control means 52 Start-up control means 53 Opening degree adjusting means 54,54a-54d Termination means 55 Superheat degree detection means Th8 Outdoor gas temperature sensor Th9 Oil temperature sensor (Oil temperature detection means)

───────────────────────────────────────────────────── フロントページの続き (56)参考文献 特開 平1−312360(JP,A) 特開 昭62−155473(JP,A) 実開 平3−67964(JP,U) (58)調査した分野(Int.Cl.7,DB名) F25B 1/00 351 F24F 11/02 102 F25B 13/00 F25B 13/00 361 ──────────────────────────────────────────────────続 き Continuation of front page (56) References JP-A 1-312360 (JP, A) JP-A 62-155473 (JP, A) JP-A 3-67964 (JP, U) (58) Field (Int.Cl. 7 , DB name) F25B 1/00 351 F24F 11/02 102 F25B 13/00 F25B 13/00 361

Claims (5)

(57)【特許請求の範囲】(57) [Claims] 【請求項1】 圧縮機(21)と、熱源側熱交換器(24)
と、開度調整可能な膨張弁(25)と、利用側熱交換器
(31)とが順に接続されて閉回路の主冷媒回路(11)が
形成されている空気調和装置の運転制御装置であって、 上記圧縮機(21)の吸込側の低圧冷媒圧力を検出する低
圧検出手段(P2)と、 暖房運転の起動時に膨張弁(25)の開度を予め設定され
た起動開度に制御する起動制御手段(52)と、 上記低圧検出手段(P2)が検出する低圧冷媒圧力に基づ
いて該低圧冷媒圧力が所定圧力以上であると、上記起動
制御手段(52)が膨張弁(25)の開度を起動開度より小
さくするように閉動信号を出力すると共に、上記低圧冷
媒圧力が所定圧力より低下するに従って上記起動制御手
段(52)が膨張弁(25)の開度を大きくするように上記
低圧冷媒圧力に対応して予め設定された所定開度に上記
膨張弁(25)の開度を設定する開動信号を出力する開度
調節手段(53)と、 暖房運転の起動時から所定時間が経過すると、上記起動
制御手段(52)の起動制御を終了させる終了手段(54)
とを備えていることを特徴とする空気調和装置の運転制
御装置。
1. A compressor (21) and a heat source side heat exchanger (24).
And an operation control device for an air conditioner in which an opening-adjustable expansion valve (25) and a use-side heat exchanger (31) are sequentially connected to form a closed-circuit main refrigerant circuit (11). A low-pressure detecting means (P2) for detecting the low-pressure refrigerant pressure on the suction side of the compressor (21); and controlling the opening of the expansion valve (25) to a preset starting opening when starting the heating operation. Starting control means (52), and when the low-pressure refrigerant pressure is equal to or higher than a predetermined pressure based on the low-pressure refrigerant pressure detected by the low-pressure detecting means (P2), the activation control means (52) controls the expansion valve (25). The closing control signal is output so that the opening of the expansion valve is smaller than the starting opening, and the starting control means (52) increases the opening of the expansion valve (25) as the low-pressure refrigerant pressure falls below a predetermined pressure. As above
The opening degree is set to a predetermined opening degree corresponding to the low-pressure refrigerant pressure.
Opening control means (53) for outputting an opening signal for setting the opening of the expansion valve (25); and starting control of the starting control means (52) is terminated when a predetermined time has elapsed from the start of the heating operation. Termination means (54)
An operation control device for an air conditioner, comprising:
【請求項2】 圧縮機(21)と、熱源側熱交換器(24)
と、開度調整可能な膨張弁(25)と、利用側熱交換器
(31)とが順に接続されて閉回路の主冷媒回路(11)が
形成されている空気調和装置の運転制御装置であって、 上記圧縮機(21)の吸込側の低圧冷媒圧力を検出する低
圧検出手段(P2)と、 暖房運転の起動時に膨張弁(25)の開度を予め設定され
た起動開度に制御する起動制御手段(52)と、 上記低圧検出手段(P2)が検出する低圧冷媒圧力に基づ
いて該低圧冷媒圧力が所定圧力以上であると、上記起動
制御手段(52)が膨張弁(25)の開度を起動開度より小
さくするように閉動信号を出力すると共に、上記低圧冷
媒圧力が所定圧力より低下するに従って上記起動制御手
段(52)が膨張弁(25)の開度を大きくするように上記
低圧冷媒圧力に対応して予め設定された所定開度に上記
膨張弁( 25)の開度を設定する開動信号を出力する開度
調節手段(53)と、 暖房運転時の熱源側熱交換器(24)における冷媒の過熱
度を検出する過熱度検出手段(55)と、 該過熱度検出手段(55)が検出した過熱度が所定温度に
なると、上記起動制御手段(52)の起動制御を終了させ
る終了手段(54a)とを備えていることを特徴とする空
気調和装置の運転制御装置。
2. A compressor (21) and a heat source side heat exchanger (24).
And an operation control device for an air conditioner in which an opening-adjustable expansion valve (25) and a use-side heat exchanger (31) are sequentially connected to form a closed-circuit main refrigerant circuit (11). A low-pressure detecting means (P2) for detecting the low-pressure refrigerant pressure on the suction side of the compressor (21); and controlling the opening of the expansion valve (25) to a preset starting opening when starting the heating operation. Starting control means (52), and when the low-pressure refrigerant pressure is equal to or higher than a predetermined pressure based on the low-pressure refrigerant pressure detected by the low-pressure detecting means (P2), the activation control means (52) controls the expansion valve (25). The closing control signal is output so that the opening of the expansion valve is smaller than the starting opening, and the starting control means (52) increases the opening of the expansion valve (25) as the low-pressure refrigerant pressure falls below a predetermined pressure. As above
The opening degree is set to a predetermined opening degree corresponding to the low-pressure refrigerant pressure.
Opening degree adjusting means (53) for outputting an opening signal for setting the opening degree of the expansion valve ( 25); and superheating degree detecting means for detecting the degree of superheating of the refrigerant in the heat source side heat exchanger (24) during the heating operation ( 55), and termination means (54a) for terminating the activation control of the activation control means (52) when the degree of superheat detected by the degree of superheat detection means (55) reaches a predetermined temperature. Operation control device for the air conditioner to be installed.
【請求項3】 圧縮機(21)と、熱源側熱交換器(24)
と、開度調整可能な膨張弁(25)と、利用側熱交換器
(31)とが順に接続されて閉回路の主冷媒回路(11)が
形成されている空気調和装置の運転制御装置であって、 上記圧縮機(21)の吸込側の低圧冷媒圧力を検出する低
圧検出手段(P2)と、 暖房運転の起動時に膨張弁(25)の開度を予め設定され
た起動開度に制御する起動制御手段(52)と、 上記低圧検出手段(P2)が検出する低圧冷媒圧力に基づ
いて該低圧冷媒圧力が所定圧力以上であると、上記起動
制御手段(52)が膨張弁(25)の開度を起動開度より小
さくするように閉動信号を出力すると共に、上記低圧冷
媒圧力が所定圧力より低下するに従って上記起動制御手
段(52)が膨張弁(25)の開度を大きくするように上記
低圧冷媒圧力に対応して予め設定された所定開度に上記
膨張弁(25)の開度を設定する開動信号を出力する開度
調節手段(53)と、 上記圧縮機(21)内の潤滑油温度を検出する油温検出手
段(Th9)と、 該油温検出手段(Th9)が検出した潤滑油温度が所定温
度になると、上記起動制御手段(52)の起動制御を終了
させる終了手段(54b)とを備えていることを特徴とす
る空気調和装置の運転制御装置。
3. A compressor (21) and a heat source side heat exchanger (24).
And an operation control device for an air conditioner in which an opening-adjustable expansion valve (25) and a use-side heat exchanger (31) are sequentially connected to form a closed-circuit main refrigerant circuit (11). A low-pressure detecting means (P2) for detecting the low-pressure refrigerant pressure on the suction side of the compressor (21); and controlling the opening of the expansion valve (25) to a preset starting opening when starting the heating operation. Starting control means (52), and when the low-pressure refrigerant pressure is equal to or higher than a predetermined pressure based on the low-pressure refrigerant pressure detected by the low-pressure detecting means (P2), the activation control means (52) controls the expansion valve (25). The closing control signal is output so that the opening of the expansion valve is smaller than the starting opening, and the starting control means (52) increases the opening of the expansion valve (25) as the low-pressure refrigerant pressure falls below a predetermined pressure. As above
The opening degree is set to a predetermined opening degree corresponding to the low-pressure refrigerant pressure.
Opening degree adjusting means (53) for outputting an opening signal for setting the opening degree of the expansion valve (25); oil temperature detecting means (Th9) for detecting a lubricating oil temperature in the compressor (21); Ending means (54b) for ending the activation control of the activation control means (52) when the lubricating oil temperature detected by the temperature detecting means (Th9) reaches a predetermined temperature. Operation control device.
【請求項4】 圧縮機(21)と、熱源側熱交換器(24)
と、開度調整可能な膨張弁(25)と、利用側熱交換器
(31)とが順に接続されて閉回路の主冷媒回路(11)が
形成されている空気調和装置の運転制御装置であって、 上記圧縮機(21)の吸込側の低圧冷媒圧力を検出する低
圧検出手段(P2)と、 暖房運転の起動時に膨張弁(25)の開度を予め設定され
た起動開度に制御する起動制御手段(52)と、 上記低圧検出手段(P2)が検出する低圧冷媒圧力に基づ
いて該低圧冷媒圧力が所定圧力以上であると、上記起動
制御手段(52)が膨張弁(25)の開度を起動開度より小
さくするように閉動信号を出力すると共に、上記低圧冷
媒圧力が所定圧力より低下するに従って上記起動制御手
段(52)が膨張弁(25)の開度を大きくするように上記
低圧冷媒圧力に対応して予め設定された所定開度に上記
膨張弁(25)の開度を設定する開動信号を出力する開度
調節手段(53)と、 暖房運転時の熱源側熱交換器(24)における冷媒の過熱
度を検出する過熱度検出手段(55)と、 上記圧縮機(21)内の潤滑油温度を検出する油温検出手
段(Th9)と、 上記過熱度検出手段(55)が検出した過熱度が所定温度
になり、且つ上記油温検出手段(Th9)が検出した潤滑
油温度が所定温度になると、上記起動制御手段(52)の
起動制御を終了させる終了手段(54C)とを備えている
ことを特徴とする空気調和装置の運転制御装置。
4. A compressor (21) and a heat source side heat exchanger (24).
And an operation control device for an air conditioner in which an opening-adjustable expansion valve (25) and a use-side heat exchanger (31) are sequentially connected to form a closed-circuit main refrigerant circuit (11). A low-pressure detecting means (P2) for detecting the low-pressure refrigerant pressure on the suction side of the compressor (21); and controlling the opening of the expansion valve (25) to a preset starting opening when starting the heating operation. Starting control means (52), and when the low-pressure refrigerant pressure is equal to or higher than a predetermined pressure based on the low-pressure refrigerant pressure detected by the low-pressure detecting means (P2), the activation control means (52) controls the expansion valve (25). The closing control signal is output so that the opening of the expansion valve is smaller than the starting opening, and the starting control means (52) increases the opening of the expansion valve (25) as the low-pressure refrigerant pressure falls below a predetermined pressure. As above
The opening degree is set to a predetermined opening degree corresponding to the low-pressure refrigerant pressure.
Opening degree adjusting means (53) for outputting an opening signal for setting the degree of opening of the expansion valve (25); and superheating degree detecting means for detecting the degree of superheating of the refrigerant in the heat source side heat exchanger (24) during the heating operation ( 55), an oil temperature detecting means (Th9) for detecting a lubricating oil temperature in the compressor (21), and a degree of superheat detected by the superheat degree detecting means (55) becomes a predetermined temperature, and the oil temperature An operation of the air conditioner, comprising: termination means (54C) for terminating the activation control of the activation control means (52) when the lubricating oil temperature detected by the detection means (Th9) reaches a predetermined temperature. Control device.
【請求項5】 圧縮機(21)と、熱源側熱交換器(24)
と、開度調整可能な膨張弁(25)と、利用側熱交換器
(31)とが順に接続されて閉回路の主冷媒回路(11)が
形成されている空気調和装置の運転制御装置であって、 上記圧縮機(21)の吸込側の低圧冷媒圧力を検出する低
圧検出手段(P2)と、 暖房運転の起動時に膨張弁(25)の開度を予め設定され
た起動開度に制御する起動制御手段(52)と、 上記低圧検出手段(P2)が検出する低圧冷媒圧力に基づ
いて該低圧冷媒圧力が所定圧力以上であると、上記起動
制御手段(52)が膨張弁(25)の開度を起動開度より小
さくするように閉動信号を出力すると共に、上記低圧冷
媒圧力が所定圧力より低下するに従って上記起動制御手
段(52)が膨張弁(25)の開度を大きくするように上記
低圧冷媒圧力に対応して予め設定された所定開度に上記
膨張弁(25)の開度を設定する開動信号を出力する開度
調節手段(53)と、 上記圧縮機(21)の吐出管温度を検出する吐出管温度検
出手段(Th4)と、 該吐出管温度検出手段(Th4)が検出した吐出管温度が
所定温度になると、上記起動制御手段(52)の起動制御
を終了させる終了手段(54d)とを備えていることを特
徴とする空気調和装置の運転制御装置。
5. A compressor (21) and a heat source side heat exchanger (24).
And an operation control device for an air conditioner in which an opening-adjustable expansion valve (25) and a use-side heat exchanger (31) are sequentially connected to form a closed-circuit main refrigerant circuit (11). A low-pressure detecting means (P2) for detecting the low-pressure refrigerant pressure on the suction side of the compressor (21); and controlling the opening of the expansion valve (25) to a preset starting opening when starting the heating operation. Starting control means (52), and when the low-pressure refrigerant pressure is equal to or higher than a predetermined pressure based on the low-pressure refrigerant pressure detected by the low-pressure detecting means (P2), the activation control means (52) controls the expansion valve (25). The closing control signal is output so that the opening of the expansion valve is smaller than the starting opening, and the starting control means (52) increases the opening of the expansion valve (25) as the low-pressure refrigerant pressure falls below a predetermined pressure. As above
The opening degree is set to a predetermined opening degree corresponding to the low-pressure refrigerant pressure.
An opening control means (53) for outputting an opening signal for setting an opening of the expansion valve (25); a discharge pipe temperature detecting means (Th4) for detecting a discharge pipe temperature of the compressor (21); An air conditioner, comprising: ending means (54d) for ending the activation control of the activation control means (52) when the discharge pipe temperature detected by the pipe temperature detection means (Th4) reaches a predetermined temperature. Operation control device.
JP12700893A 1993-05-28 1993-05-28 Operation control device for air conditioner Expired - Lifetime JP3208923B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP12700893A JP3208923B2 (en) 1993-05-28 1993-05-28 Operation control device for air conditioner

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP12700893A JP3208923B2 (en) 1993-05-28 1993-05-28 Operation control device for air conditioner

Publications (2)

Publication Number Publication Date
JPH06337174A JPH06337174A (en) 1994-12-06
JP3208923B2 true JP3208923B2 (en) 2001-09-17

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ID=14949406

Family Applications (1)

Application Number Title Priority Date Filing Date
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Country Status (1)

Country Link
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