JPH0599543A - Protection device for refrigerator - Google Patents
Protection device for refrigeratorInfo
- Publication number
- JPH0599543A JPH0599543A JP26368491A JP26368491A JPH0599543A JP H0599543 A JPH0599543 A JP H0599543A JP 26368491 A JP26368491 A JP 26368491A JP 26368491 A JP26368491 A JP 26368491A JP H0599543 A JPH0599543 A JP H0599543A
- Authority
- JP
- Japan
- Prior art keywords
- temperature
- discharge pipe
- compressor
- sensor
- heat exchanger
- 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.)
- Granted
Links
Landscapes
- Air Conditioning Control Device (AREA)
Abstract
Description
【0001】[0001]
【産業上の利用分野】本発明は、吐出管温度制御を行う
ようにした冷凍装置の保護装置に係り、特に吐出管温度
センサの取外しに起因する圧縮機の焼損防止対策に関す
る。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a protection device for a refrigerating device which controls a discharge pipe temperature, and more particularly to a burnout prevention measure for a compressor caused by removal of a discharge pipe temperature sensor.
【0002】[0002]
【従来の技術】従来より、例えば特公昭59―1294
2号公報に開示される如く、圧縮機、凝縮器、電動膨張
弁及び蒸発器を順次接続してなる冷媒回路を備えた冷凍
装置の運転制御装置として、冷媒回路の蒸発温度及び凝
縮温度に基づき最大の冷凍効果を与える圧縮機の吐出管
温度の最適温度を算出し、この最適温度を吐出管温度の
制御目標値として電動膨張弁の開度を制御することによ
り、定容量形圧縮機を使用しながら、良好な冷凍能力及
び冷凍装置の運転効率の維持を図るようにしたものは公
知の技術である。2. Description of the Related Art Conventionally, for example, Japanese Patent Publication No. Sho 59-1294.
As disclosed in Japanese Unexamined Patent Publication No. 2 (1998), as an operation control device of a refrigeration system including a refrigerant circuit in which a compressor, a condenser, an electric expansion valve, and an evaporator are sequentially connected, based on the evaporation temperature and the condensation temperature of the refrigerant circuit. A constant capacity compressor is used by calculating the optimum temperature of the discharge pipe temperature of the compressor that gives the maximum refrigeration effect and controlling the opening of the electric expansion valve using this optimum temperature as the control target value of the discharge pipe temperature. However, it is a known technique to maintain good refrigerating capacity and operating efficiency of the refrigerating apparatus.
【0003】[0003]
【発明が解決しようとする課題】ところで、冷凍装置に
おいて、圧縮機の吐出管に取付けられた吐出管センサ
は、通常保護装置を作動させるために使用されることが
多く、冷媒の不足等で圧縮機の内部温度が過上昇する
と、吐出管センサの信号により保護装置を作動させ、冷
凍装置の運転を停止させるようにしている。By the way, in a refrigeration system, a discharge pipe sensor attached to a discharge pipe of a compressor is usually used for operating a protective device, and is compressed due to lack of a refrigerant or the like. When the internal temperature of the machine rises excessively, the protection device is activated by the signal of the discharge pipe sensor to stop the operation of the refrigeration system.
【0004】しかるに、冷凍装置の据付時における取付
ミス等や運転中の事故で吐出管センサが吐出管から外れ
てしまうことがあり、かかる場合、圧縮機の内部温度が
過上昇しても吐出管センサの検出値はほとんど変化しな
いので、保護装置が作動せず、その結果圧縮機が焼損す
る等の事故に至る虞れがある。However, the discharge pipe sensor may come off from the discharge pipe due to an installation error or the like during installation of the refrigeration system or an accident during operation. In such a case, even if the internal temperature of the compressor rises excessively, Since the detection value of the sensor hardly changes, the protective device does not operate, and as a result, there is a possibility that an accident such as burnout of the compressor may occur.
【0005】特に、上記公報のもののように、電動膨張
弁の開度で圧縮機の吐出管温度を目標値制御するもので
は、吐出管センサの検出値が低いと電動膨張弁の開度を
絞る方向に制御することになるので、そのまま運転が継
続されると、圧縮機の冷媒がどんどん減少して行き、た
ちまち圧縮機の焼損に至る危険性が非常に高くなるとい
う問題があった。Particularly, in the case of controlling the discharge pipe temperature of the compressor by the target value by the opening degree of the electric expansion valve as in the above publication, the opening degree of the electric expansion valve is narrowed when the detection value of the discharge pipe sensor is low. Since it is controlled in the direction, if the operation is continued as it is, there is a problem that the refrigerant in the compressor is gradually reduced and the risk of the compressor being burned out is very high.
【0006】本発明は斯かる点に鑑みてなされたもので
あり、その目的は、吐出管センサが吐出管から外れたこ
とを確実に検知する手段を講ずることにより、圧縮機の
焼損を未然に防止することにある。The present invention has been made in view of the above problems, and an object of the present invention is to prevent burnout of a compressor in advance by providing a means for surely detecting that the discharge pipe sensor is disengaged from the discharge pipe. To prevent.
【0007】[0007]
【課題を解決するための手段】以上の目的を達成するた
め、請求項1の発明の講じた手段は、図1に示すように
(点線部分は含まず)、圧縮機(1)、熱源側熱交換器
(3)、電動膨張弁(5)及び利用側熱交換器(6)を
順次接続してなる冷媒回路(9)を備えた冷凍装置を前
提とする。Means for Solving the Problems To achieve the above object, the means taken by the invention of claim 1 is, as shown in FIG. 1 (not including a dotted line portion), a compressor (1), a heat source side. A refrigeration system provided with a refrigerant circuit (9) in which a heat exchanger (3), an electric expansion valve (5), and a use side heat exchanger (6) are sequentially connected is assumed.
【0008】そして、冷凍装置の運転制御装置として、
上記圧縮機(1)の吐出管(8d)に取り付けられ、吐
出管温度を検出する吐出管温度センサ(Th2)と、該吐
出管温度センサ(Th2)の出力を受け、吐出管温度が所
定温度以上に達すると、作動して冷凍装置の運転を停止
させる保護手段(11)とを設ける。As an operation control device for the refrigeration system,
The discharge pipe temperature sensor (Th2) attached to the discharge pipe (8d) of the compressor (1) for detecting the discharge pipe temperature and the output of the discharge pipe temperature sensor (Th2) receive the discharge pipe temperature at a predetermined temperature. When the above is reached, there is provided a protection means (11) which operates to stop the operation of the refrigeration system.
【0009】さらに、圧縮機(1)の起動後の経過時間
を計測する計時手段(12)と、該計時手段(12)の
出力を受け、圧縮機(1)の起動後所定時間が経過した
ときにおける上記吐出管センサ(Th2)の検出値と圧縮
機(1)の起動時における吐出管センサ(Th2)の検出
値との温度差が一定温度差以下のとき、冷凍装置を異常
停止させる異常処理手段(53A)とを設ける構成とし
たものである。Further, a predetermined time has elapsed after the compressor (1) was started up by receiving the time-measuring means (12) for measuring the elapsed time after the start-up of the compressor (1) and the output of the timekeeping means (12). When the temperature difference between the detection value of the discharge pipe sensor (Th2) at time and the detection value of the discharge pipe sensor (Th2) at the time of starting the compressor (1) is equal to or less than a certain temperature difference, an abnormality that abnormally stops the refrigeration system The processing means (53A) is provided.
【0010】請求項2の発明の講じた手段は、上記請求
項1の発明と同様の冷凍装置を前提とし、冷凍装置の運
転制御装置として、図1に示すように(点線部分は含ま
ず)、上記圧縮機(1)の吐出管(8d)に取り付けら
れ、吐出管温度を検出する吐出管温度センサ(Th2)
と、該吐出管温度センサ(Th2)の出力を受け、吐出管
温度が所定温度以上に達すると、作動して冷凍装置の運
転を停止させる保護手段(11)とを設け、さらに、圧
縮機(1)の起動後の経過時間を計測する計時手段(1
2)と、該計時手段(12)の出力を受け、圧縮機
(1)の起動後所定時間が経過したときに上記吐出管セ
ンサ(Th2)の検出値が所定値以下のとき、冷凍装置を
異常停止させる異常処理手段(53B)とを設けたもの
である。The means taken by the invention of claim 2 presupposes a refrigerating apparatus similar to that of the invention of claim 1, and as an operation control device for the refrigerating apparatus, as shown in FIG. 1 (not including the dotted line portion). , A discharge pipe temperature sensor (Th2) attached to the discharge pipe (8d) of the compressor (1) for detecting the discharge pipe temperature
And a protection means (11) which receives the output of the discharge pipe temperature sensor (Th2) and operates to stop the operation of the refrigeration system when the discharge pipe temperature reaches a predetermined temperature or higher. 1) A time measuring means (1) for measuring an elapsed time after starting
2) and the output of the time measuring means (12), and when the detection value of the discharge pipe sensor (Th2) is equal to or less than a predetermined value when a predetermined time has elapsed after the compressor (1) is started, the refrigeration system is operated. An abnormality processing means (53B) for abnormally stopping is provided.
【0011】請求項3の発明の講じた手段は、上記請求
項1の発明と同様の冷凍装置を前提とし、冷凍装置の運
転制御装置として、上記圧縮機(1)の吐出管(8d)
に取り付けられ、吐出管温度を検出する吐出管温度セン
サ(Th2)と、該吐出管温度センサ(Th2)の出力を受
け、吐出管温度が所定温度以上に達すると、作動して冷
凍装置の運転を停止させる保護手段(11)とを設け、
さらに、図1の点線に示すように、外気温度を検出する
外気温度検出手段(Tha)と、圧縮機(1)の起動後の
経過時間を計測する計時手段(12)と、該計時手段
(12)の出力を受け、圧縮機(1)の起動後所定時間
が経過したときにおける上記吐出管センサ(Th2)の検
出値が上記外気温度検出手段(Tha)で検出される外気
温度に一定値を加算した温度よりも低いとき、冷凍装置
を異常停止させる異常処理手段(53C)とを設ける構
成としたものである。The means taken by the invention of claim 3 presupposes a refrigerating apparatus similar to that of the invention of claim 1, and the discharge pipe (8d) of the compressor (1) is used as an operation control device of the refrigerating apparatus.
Attached to the discharge pipe temperature sensor (Th2) for detecting the discharge pipe temperature, and the output of the discharge pipe temperature sensor (Th2). When the discharge pipe temperature reaches or exceeds a predetermined temperature, the refrigerator operates to operate the refrigeration system. And a protection means (11) for stopping the
Further, as shown by a dotted line in FIG. 1, an outside air temperature detecting means (Tha) for detecting an outside air temperature, a time measuring means (12) for measuring an elapsed time after the compressor (1) is started, and the time measuring means ( 12) The output value of the discharge pipe sensor (Th2) when a predetermined time has elapsed after the compressor (1) is started after receiving the output of 12) is a constant value for the outside air temperature detected by the outside air temperature detecting means (Tha). When the temperature is lower than the temperature obtained by adding, the abnormality processing means (53C) for abnormally stopping the refrigeration system is provided.
【0012】請求項4の発明の講じた手段は、上記請求
項1,2又は3の発明において、図1の破線部分に示す
ように、冷媒回路(1)の凝縮温度,蒸発温度等に応じ
て、最適の冷凍効果を与える吐出冷媒温度の最適温度を
演算する最適温度演算手段(51)と、上記吐出管温度
センサ(Th2)の出力を受け、吐出管温度が上記最適温
度演算手段(51)で演算される最適温度に収束するよ
う上記電動膨張弁(5)の開度を制御する開度制御手段
(52)とを設ける構成としたものである。According to the invention of claim 4, in the invention of claim 1, 2 or 3, the means for taking measures according to the condensation temperature, the evaporation temperature, etc. of the refrigerant circuit (1) is shown in the broken line part of FIG. And the output of the discharge pipe temperature sensor (Th2) and the optimum temperature calculation means (51) that calculates the optimum temperature of the discharge refrigerant temperature that gives the optimum refrigeration effect, and the discharge pipe temperature is the optimum temperature calculation means (51). ), The opening degree control means (52) for controlling the opening degree of the electric expansion valve (5) is provided so as to converge to the optimum temperature calculated in (1).
【0013】[0013]
【作用】以上の構成により、請求項1の発明では、冷凍
装置の運転中、、吐出管センサ(Th2)で検出される吐
出管温度が所定温度以上になると、保護手段(11)に
より、冷凍装置が異常停止され、圧縮機(1)が保護さ
れるが、吐出管センサ(Th2)が吐出管(8d)から脱
落していると、吐出管センサ(Th2)の検出値が実際の
吐出温度とは違った値になる。特に、電動膨張弁(5)
の開度は運転状態によって変化し、絞り気味となって冷
媒の循環量が減少していることがあり、そのような状態
で圧縮機(1)が過熱して吐出管温度が過上昇していて
も保護装置(11)が作動せず、圧縮機(1)の焼損等
の事故に至る虞れがある。With the above construction, in the invention of claim 1, when the discharge pipe temperature detected by the discharge pipe sensor (Th2) becomes a predetermined temperature or more during the operation of the refrigeration system, the protection means (11) causes the freezing to be performed. The device is stopped abnormally and the compressor (1) is protected, but if the discharge pipe sensor (Th2) is detached from the discharge pipe (8d), the detected value of the discharge pipe sensor (Th2) is the actual discharge temperature. Will have a different value. In particular, electric expansion valve (5)
The degree of opening of the refrigerant may change depending on the operating condition, and the amount of refrigerant circulation may decrease and the compressor (1) may overheat and the discharge pipe temperature may rise excessively. However, the protective device (11) does not operate, and there is a risk that an accident such as burnout of the compressor (1) will occur.
【0014】ここで、吐出管センサ(Th2)が吐出管
(8d)に正しく取付けられている状態では、圧縮機
(1)の起動後一定時間経過後の吐出管温度と起動時の
吐出管温度との温度差が相当温度に達するはずであるの
で、両者の温度差が一定温度差以下の時には、吐出管セ
ンサ(Th2)が脱落している可能性が高い。したがっ
て、異常処理手段(53A)により空気調和装置が異常
停止されることで、圧縮機(1)の焼損が未然に防止さ
れることになる。Here, in a state where the discharge pipe sensor (Th2) is correctly attached to the discharge pipe (8d), the discharge pipe temperature after a lapse of a fixed time after the start of the compressor (1) and the discharge pipe temperature at the time of start. Since the temperature difference between and the temperature should reach a considerable temperature, it is highly possible that the discharge pipe sensor (Th2) has fallen off when the temperature difference between the two is less than a certain temperature difference. Therefore, the air conditioner is abnormally stopped by the abnormality processing means (53A), whereby the burnout of the compressor (1) is prevented in advance.
【0015】請求項2の発明では、通常圧縮機(1)の
起動後所定時間が経過したときには圧縮機(1)の内部
が暖められ、吐出管温度がある温度以上に達するはずで
あるので、吐出管センサ(Th2)の検出値が所定値以下
の時には、吐出管センサ(Th2)が吐出管(8d)から
脱落している可能性が極めて高い。したがって、異常処
理手段(53B)により空気調和装置が異常停止される
ことで、圧縮機(1)の焼損が未然に防止されることに
なる。According to the second aspect of the present invention, the inside of the compressor (1) is normally warmed when a predetermined time has elapsed after the compressor (1) is started, and the discharge pipe temperature should reach a certain temperature or higher. When the detection value of the discharge pipe sensor (Th2) is less than or equal to the predetermined value, it is highly likely that the discharge pipe sensor (Th2) has fallen off the discharge pipe (8d). Therefore, the air conditioner is abnormally stopped by the abnormality processing means (53B), so that the burnout of the compressor (1) is prevented in advance.
【0016】請求項3の発明では、吐出管センサ(Th
2)が吐出管(8d)から脱落すると、その後限りなく
外気温度に近付くことから、起動後所定時間が経過した
時に、吐出管センサ(Th2)の検出値が外気温度よりも
一定値以上上昇していないときには、吐出管センサ(T
h2)が脱落している可能性が極めて高い。したがって、
異常処理手段(53C)により空気調和装置が異常停止
されることで、圧縮機(1)の焼損が未然に防止される
ことになる。In the invention of claim 3, the discharge pipe sensor (Th
When 2) falls off from the discharge pipe (8d), the temperature of the discharge pipe (8d) approaches the outside air without limit. If not, the discharge pipe sensor (T
It is very likely that h2) is missing. Therefore,
By abnormally stopping the air conditioner by the abnormality processing means (53C), burnout of the compressor (1) is prevented in advance.
【0017】請求項4の発明では、上記請求項1,2又
は3の発明において、最適温度演算手段(51)によ
り、蒸発温度,凝縮温度等に基づき最適な冷凍効果を与
える吐出管温度の最適温度を算出して、開度制御手段
(52)により、吐出管温度がこの最適温度に収束する
よう電動膨張弁(5)の開度を制御するようにした場
合、吐出管センサ(Th2)が脱落してその検出値が実際
の吐出管温度よりも低いと、見掛上の吐出管温度が制御
目標値よりも小さくなるので、電動膨張弁(5)の開度
が閉じられる。したがって、そのまま運転が継続する
と、冷媒の急激な減少が生じ、圧縮機(1)が短時間の
うちに過熱して焼損に至る危険性が高いが、そのような
ときにも、上記各発明の作用により、圧縮機(1)の焼
損等の事故が未然に防止されることになる。According to a fourth aspect of the present invention, in the first, second or third aspect of the present invention, the optimum temperature calculating means (51) is used to optimize the discharge pipe temperature that provides the optimum refrigerating effect based on the evaporation temperature, the condensation temperature and the like. When the temperature is calculated and the opening control means (52) controls the opening of the electric expansion valve (5) so that the discharge pipe temperature converges to this optimum temperature, the discharge pipe sensor (Th2) If it falls and the detected value is lower than the actual discharge pipe temperature, the apparent discharge pipe temperature becomes smaller than the control target value, and the opening degree of the electric expansion valve (5) is closed. Therefore, if the operation is continued as it is, the refrigerant is rapidly reduced, and there is a high risk that the compressor (1) will be overheated and burned in a short time. Due to the action, accidents such as burnout of the compressor (1) are prevented in advance.
【0018】[0018]
【実施例】以下、本発明の実施例について、第1図に基
づき説明する。Embodiments of the present invention will be described below with reference to FIG.
【0019】第1図は本発明を適用した空気調和装置の
冷媒配管系統を示し、一台の室外ユニット(A)に対し
て一台の室内熱交換器(B)が接続されたいわゆるセパ
レートタイプのものである。上記室外ユニット(A)に
は、圧縮機(1)と、冷房運転時には図中実線のごと
く、暖房運転時には図中破線のごとく切換わる四路切換
弁(2)と、冷房運転時には凝縮器として、暖房運転時
には蒸発器として機能する熱源側熱交換器である室外熱
交換器(3)と、冷媒を減圧するための減圧部(20)
と、圧縮機(1)の吸入管に介設され、吸入冷媒中の液
冷媒を除去するためのアキュムレ―タ(7)とが主要機
器として配置されているまた、室内ユニット(B)に
は、冷房運転時には蒸発器として、暖房運転時には凝縮
器として機能する利用側熱交換器である室内熱交換器
(6)が配置されている。上記各機器は冷媒配管(8)
により順次接続され、冷媒の循環により熱移動を生ぜし
めるようにした冷媒回路(9)が構成されている。FIG. 1 shows a refrigerant piping system of an air conditioner to which the present invention is applied, which is a so-called separate type in which one indoor unit (A) is connected to one indoor heat exchanger (B). belongs to. The outdoor unit (A) includes a compressor (1), a four-way switching valve (2) that switches as shown by a solid line in the figure during a cooling operation, and a broken line in the figure as a heating operation, and as a condenser during a cooling operation. The outdoor heat exchanger (3), which is a heat source side heat exchanger that functions as an evaporator during heating operation, and a decompression unit (20) for decompressing the refrigerant.
And an accumulator (7) for removing the liquid refrigerant in the suction refrigerant, which is interposed in the suction pipe of the compressor (1), is arranged as a main device. Also, in the indoor unit (B), An indoor heat exchanger (6), which is a utilization side heat exchanger that functions as an evaporator during cooling operation and as a condenser during heating operation, is arranged. Each of the above equipment is a refrigerant pipe (8)
A refrigerant circuit (9) is constructed in which the refrigerant circuits (9) are sequentially connected to each other to cause heat transfer by circulation of the refrigerant.
【0020】ここで、上記減圧部(20)には、液冷媒
を貯溜するためのレシ―バ(4)と、液冷媒の減圧機能
と流量調節機能とを有する電動膨張弁(5)とが配設さ
れ、上記レシ―バ(4)と電動膨張弁(5)とは、電動
膨張弁(5)がレシ―バ(4)の下部つまり液部に連通
するよう、室外熱交換器(3)の補助熱交換器(3a)
を介して共通路(8a)に直列に配置されている。そし
て、共通路(8a)のレシ―バ(4)上流側の端部
(P)と室外熱交換器(3)との間は、室外熱交換器
(3)からレシ―バ(4)への冷媒の流通のみを許容す
る第1逆止弁(D1)を介して第1流入路(8b1)によ
り、上記共通路(8a)の点(P)と室内熱交換器
(6)との間は室内熱交換器(6)からレシ―バ(4)
への冷媒の流通のみを許容する第2逆止弁(D2)を介
して第2流入路(8b2)により、それぞれ接続されてい
る一方、共通路(8a)の上記電動膨張弁(5)他端側
の端部(Q)と上記第2逆止弁(D2)−室内熱交換器
(6)間の点(R)との間は電動膨張弁(5)から室内
熱交換器(6)への冷媒の流通のみを許容する第3逆止
弁(D3)を介して第1流出路(8c1)により、共通路
(8a)の上記点(Q)と上記第1逆止弁(D1)−室
外熱交換器(3)間の点(S)との間は電動膨張弁
(5)から室外熱交換器(3)への冷媒の流通のみを許
容する第4逆止弁(D4)を介して第2流出路(8c2)
により、それぞれ接続されている。The pressure reducing section (20) is provided with a receiver (4) for storing the liquid refrigerant and an electric expansion valve (5) having a pressure reducing function and a flow rate adjusting function for the liquid refrigerant. The receiver (4) and the electric expansion valve (5) are disposed so that the electric expansion valve (5) communicates with the lower portion of the receiver (4), that is, the liquid portion. ) Auxiliary heat exchanger (3a)
Are arranged in series on the common path (8a). Then, between the outdoor end (P) of the receiver (4) upstream of the common path (8a) and the outdoor heat exchanger (3), the outdoor heat exchanger (3) goes to the receiver (4). Between the point (P) of the common path (8a) and the indoor heat exchanger (6) by the first inflow path (8b1) via the first check valve (D1) that allows only the circulation of the refrigerant of Is from the indoor heat exchanger (6) to the receiver (4)
The electric expansion valve (5) and the like on the common path (8a), while being connected to each other by the second inflow path (8b2) through the second check valve (D2) that allows only the flow of the refrigerant to the Between the end portion (Q) on the end side and the point (R) between the second check valve (D2) and the indoor heat exchanger (6), the electric expansion valve (5) is connected to the indoor heat exchanger (6). The first check valve (D1) and the point (Q) of the common path (8a) by the first outflow passage (8c1) through the third check valve (D3) that allows only the flow of the refrigerant to the first check valve (D1). A fourth check valve (D4) which allows only the flow of the refrigerant from the electric expansion valve (5) to the outdoor heat exchanger (3) between the outdoor heat exchanger (3) and the point (S). Through the 2nd outflow path (8c2)
Are connected to each other.
【0021】また、上記レシ―バ(4)の上流側の点
(P)と流出側の点(Q)との間には、キャピラリチュ
―ブ(C)を介設してなる液封防止バイパス路(8f)
が設けられていて、該液封防止バイパス路(8f)によ
り、圧縮機(1)の停止時における液封を防止するとと
もに、ガス冷媒がレシ―バ(4)上部から第1流出路
(8c1)側に移動しうるようになされている。なお、上
記キャピラリチュ―ブ(C)の減圧度は電動膨張弁
(5)よりも十分大きくなるように設定されていて、通
常運転時における電動膨張弁(5)による冷媒流量調節
機能を良好に維持しうるようになされている。Further, a capillary tube (C) is interposed between a point (P) on the upstream side and a point (Q) on the outflow side of the receiver (4) to prevent liquid sealing. Bypass road (8f)
Is provided, the liquid sealing prevention bypass passage (8f) prevents liquid sealing when the compressor (1) is stopped, and the gas refrigerant flows from the upper portion of the receiver (4) to the first outflow passage (8c1). ) Is able to move to the side. The degree of pressure reduction of the capillary tube (C) is set to be sufficiently larger than that of the electric expansion valve (5), so that the electric flow expansion function of the electric expansion valve (5) during normal operation can be improved. It is designed to be maintainable.
【0022】なお、(F1)〜(F4)は冷媒中の塵埃
を除去するためのフィルタ、(ER)は圧縮機(1)の
運転音を低減させるための消音器である。Incidentally, (F1) to (F4) are filters for removing dust in the refrigerant, and (ER) is a silencer for reducing the operation noise of the compressor (1).
【0023】さらに、空気調和装置にはセンサ類が設け
られていて、(Th2)は吐出管に配置され、吐出管温度
T2を検出する吐出管センサ、(Tha)は室外ユニット
(A)の空気吸込口に配置され、外気温度である吸込空
気温度Taを検出する室外吸込センサ、(Thc)は室外
熱交換器(3)に配置され、冷房運転時には凝縮温度と
なり暖房運転時には蒸発温度となる外熱交温度Tcを検
出する外熱交センサ、(Thr)は室内ユニット(B)の
空気吸込口に配置され、室内温度である吸込空気温度T
rを検出する室内吸込センサ、(The)は室内熱交換器
(6)に配置され、冷房運転時には凝縮温度となり暖房
運転時には蒸発温度となる内熱交温度Teを検出する内
熱交センサ、(HPS)は高圧側圧力の過上昇によりオン
となって後述の保護装置(11)を作動させる高圧圧力
スイッチ、(LPS)は低圧側圧力の過低下によりオンと
なって保護装置(11)を作動させる低圧圧力スイッチ
である。上記各センサ類の信号は(10)は空気調和装
置の運転を制御するコントローラに入力可能に接続され
ており、該コントローラ(10)により、上記各センサ
類の信号に応じて、空気調和装置の運転を制御するよう
になされている。Further, the air conditioner is provided with sensors, (Th2) is arranged in the discharge pipe, a discharge pipe sensor for detecting the discharge pipe temperature T2, and (Tha) is air of the outdoor unit (A). The outdoor suction sensor (Thc), which is arranged at the suction port and detects the intake air temperature Ta that is the outside air temperature, is arranged in the outdoor heat exchanger (3) and becomes the condensation temperature during the cooling operation and the evaporation temperature during the heating operation. An external heat exchange sensor for detecting the heat exchange temperature Tc, (Thr) is arranged at the air intake port of the indoor unit (B), and is the intake air temperature T that is the indoor temperature.
The indoor suction sensor for detecting r, (The) is arranged in the indoor heat exchanger (6), and detects the internal heat exchange temperature Te that becomes the condensation temperature during the cooling operation and becomes the evaporation temperature during the heating operation, ( (HPS) is a high pressure switch that is turned on by an excessive increase in the high pressure side pressure to activate the protection device (11), and (LPS) is turned on by an excessive decrease in the low pressure side pressure and activates the protection device (11). It is a low pressure switch that allows. The signals (10) of each sensor are connected to a controller that controls the operation of the air conditioner, and the controller (10) outputs signals of the air conditioner according to the signals of each sensor. It is designed to control driving.
【0024】また、上記コントローラ(10)内には、
空気調和装置の運転中、何らかの異常が生じた時に作動
して、空気調和装置を異常停止させる請求項1〜3の発
明にいう保護手段としての保護装置(11)と、時間を
計測する計時手段としてのタイマ(12)とが内蔵され
ている。そして、上記保護装置(11)には、図示しな
いが、上記高低圧スイッチ(HPS),(LPS)の他、吐
出管センサ(T2)の信号も入力されており、吐出管温
度T2が所定温度以上になると、保護装置(11)が作
動して空気調和装置を異常停止させ、圧縮機(1)の焼
損等の事故を防止するようになされている。In the controller (10),
A protection device (11) as a protection means according to the invention of claims 1 to 3, which is activated when an abnormality occurs during operation of the air conditioner to abnormally stop the air conditioner, and a timekeeping means for measuring time. And a timer (12) as. Although not shown, the protection device (11) is also supplied with signals from the discharge pipe sensor (T2) in addition to the high and low pressure switches (HPS) and (LPS), and the discharge pipe temperature T2 is a predetermined temperature. In the above case, the protection device (11) operates to abnormally stop the air conditioner and prevent accidents such as burnout of the compressor (1).
【0025】図3は、上記吐出管センサ(Th2)の吐出
管への取付状態を示し、吐出管センサ(Th2)は、吐出
管(8d)にろう付けされた感温筒取付管(21)の中
に挿入され、さらにその外方から吐出管断熱材(22)
を取付けて、吐出管センサ(Th2)を固定するようにな
されている。なお、(23)はセンサ取付け用バネ部材
である。FIG. 3 shows a state in which the discharge pipe sensor (Th2) is attached to the discharge pipe. The discharge pipe sensor (Th2) is attached to the discharge pipe (8d) by a temperature-sensitive tube mounting pipe (21). Insulation pipe (22) inserted from the outside and further from the outside
Is attached to fix the discharge pipe sensor (Th2). In addition, (23) is a sensor mounting spring member.
【0026】上記冷媒回路(9)において、冷房運転時
には、室外熱交換器(3)で凝縮液化された液冷媒が第
1流入路(8b1)から流入し、第1逆止弁(D1)を経
てレシ―バ(4)に貯溜され、電動膨張弁(5)で減圧
された後、第1流出路(8c1)を経て室内熱交換器
(6)で蒸発して圧縮機(1)に戻る循環となる一方、
暖房運転時には、室内熱交換器(6)で凝縮液化された
液冷媒が第2流入路(8b2)から流入し、第2逆止弁
(D2)を経てレシ―バ(4)に貯溜され、電動膨張弁
(5)で減圧された後、第2流出路(8c2)を経て室外
熱交換器(3)で蒸発して圧縮機(1)に戻る循環とな
る。In the refrigerant circuit (9), during the cooling operation, the liquid refrigerant condensed and liquefied in the outdoor heat exchanger (3) flows in from the first inflow passage (8b1), and the first check valve (D1) is turned on. After being stored in the receiver (4) and decompressed by the electric expansion valve (5), it is evaporated in the indoor heat exchanger (6) through the first outflow passage (8c1) and returned to the compressor (1). While becoming a cycle,
During the heating operation, the liquid refrigerant condensed and liquefied in the indoor heat exchanger (6) flows in from the second inflow passage (8b2), is stored in the receiver (4) via the second check valve (D2), After the pressure is reduced by the electric expansion valve (5), it is circulated through the second outflow passage (8c2) to evaporate in the outdoor heat exchanger (3) and return to the compressor (1).
【0027】ここで、上記コントローラ(10)の制御
内容について説明する。図4は、上記コントローラ(1
0)の冷房運転時における制御内容を示し、ステップS
T1で、上記内熱交センサ(The)で検出される蒸発温
度Te、外熱交センサ(Thc)で検出される凝縮温度T
c及び吐出管センサ(Th2)で検出される吐出管温度T
2をそれぞれ入力し、ステップST2で、下記(1) 式 Tk =4−1.13Te +1.72Tc (1) に基づき、最適な冷凍効果EERを与える吐出管温度で
ある最適温度Tkを算出する。Here, the control contents of the controller (10) will be described. FIG. 4 shows the controller (1
0) shows the control contents during the cooling operation of step 0),
At T1, the evaporation temperature Te detected by the inner heat exchange sensor (The) and the condensation temperature T detected by the outer heat exchange sensor (Thc)
c and the discharge pipe temperature T detected by the discharge pipe sensor (Th2)
2 is input, and in step ST2, the optimum temperature Tk that is the discharge pipe temperature that gives the optimum refrigerating effect EER is calculated based on the following equation (1) Tk = 4-1.13Te + 1.72Tc (1).
【0028】そして、ステップST3で、式 ΔT2=
T2−Tkに基づき吐出管温度T2と最適温度Tkとの
温度差ΔT2を算出した後、ステップST4で、|ΔT
2|≦5か否か、つまり吐出管温度T2が最適温度Tk
の上下一定範囲内に収束したか否かを判別し、収束する
までは、ステップST5に進んで、ΔT2が正か否か、
つまり吐出管温度T2が最適温度Tkよりも高いか否か
を判別し、吐出管温度T2の方が高ければ、ステップS
T6で、電動膨張弁(5)を中程度に開くよう制御する
一方、吐出管温度T2の方が低ければ、ステップST7
で、電動膨張弁(5)の開度を中程度に閉じるように制
御する。Then, in step ST3, the expression ΔT2 =
After calculating the temperature difference ΔT2 between the discharge pipe temperature T2 and the optimum temperature Tk based on T2-Tk, in step ST4, | ΔT
2 | ≦ 5, that is, the discharge pipe temperature T2 is the optimum temperature Tk
It is determined whether or not it has converged within a certain range above and below, and until it converges, the process proceeds to step ST5 and whether or not ΔT2 is positive,
That is, it is determined whether or not the discharge pipe temperature T2 is higher than the optimum temperature Tk, and if the discharge pipe temperature T2 is higher, step S
At T6, the electric expansion valve (5) is controlled to open to the middle level, while if the discharge pipe temperature T2 is lower, step ST7.
Then, the opening degree of the electric expansion valve (5) is controlled so as to be closed to an intermediate degree.
【0029】一方、上記ステップST4の判別で、|Δ
T2|≦5となり、吐出管温度T2が最適温度Tkの上
下一定範囲内に収束すると、ステップST8に移行し
て、詳細は省略するが、電動膨張弁(5)の開度を微細
に調節するファジ―制御を実行する。On the other hand, in the determination in step ST4, | Δ
When T2 | ≦ 5 and the discharge pipe temperature T2 converges within a certain range above and below the optimum temperature Tk, the process proceeds to step ST8, and although not described in detail, the opening degree of the electric expansion valve (5) is finely adjusted. Perform fuzzy control.
【0030】上記フロ―において、ステップST2の制
御により、請求項4の発明にいう最適温度演算手段(5
1)が構成され、ステップST4〜ST8の制御によ
り、請求項2の発明にいう開度制御手段(52)が構成
されている。In the above flow, the optimum temperature calculating means (5) according to the invention of claim 4 is controlled by the control of step ST2.
1) is configured, and the opening degree control means (52) according to the invention of Claim 2 is configured by the control of steps ST4 to ST8.
【0031】次に、吐出管センサ(Th2)の脱落検知制
御の内容について、図5のフロ―チャ―トに基づき説明
する。まず、ステップSS1で、空気調和装置の起動後
5分間が経過したか否かを判別し、5分間が経過するま
ではステップSS10に移行して通常運転を行う。そし
て、起動後5分間が経過すると、ステップSS2〜SS
5で、デフロスト運転中でないか否か、T2−To2≦5
(℃)(ただし、T2は起動後5分が経過したときの吐
出管温度、To2は起動時の吐出管温度である)か否か、
T2<55(℃)か否か、T2<Ta+10か否かをそ
れぞれ判断し、各判別結果のうち一つでもNOであれ
ば、上記ステップSS10に移行して通常運転を行う一
方、各ステップSS2〜SS5における判別結果がいず
れもNOの時にはステップSS6に進んで、カウンタ
(図示せず)によりカウントされる検知回数Fgを積算
する。そして、ステップSS7で、Fg≧6か否かを判
別して、Fg≧6になるまでは、ステップSS8に進ん
で、一定時間の間サーモオフ運転を行った後、上記脱落
検知の制御を繰り返し、Fg≧6になると、つまり6回
のリトライを行った後なおも上記各ステップSS2〜S
S5の条件が成立するときに、初めて吐出管センサ(T
h2)が吐出管(8d)から脱落していると判断し、ステ
ップSS9に移行して、空気調和装置を異常停止させる
異常処理を行う。Next, the content of the dropout detection control of the discharge pipe sensor (Th2) will be described based on the flowchart of FIG. First, in step SS1, it is determined whether or not 5 minutes have elapsed after the start of the air conditioner, and the process proceeds to step SS10 to perform normal operation until 5 minutes have elapsed. Then, when 5 minutes have passed after the startup, steps SS2 to SS
In step 5, whether or not the defrost operation is in progress, T2-To2≤5
(° C) (however, T2 is the discharge pipe temperature when 5 minutes have elapsed after startup, To2 is the discharge pipe temperature at startup),
Whether or not T2 <55 (° C.) or T2 <Ta + 10 is determined, and if any one of the determination results is NO, the process proceeds to step SS10 and the normal operation is performed, while each step SS2 When all the determination results in SS5 to NO are NO, the process proceeds to step SS6, and the number of detection times Fg counted by a counter (not shown) is integrated. Then, in step SS7, it is determined whether or not Fg ≧ 6, and until Fg ≧ 6, the process proceeds to step SS8, the thermo-off operation is performed for a certain period of time, and then the above-described control of dropout detection is repeated, When Fg ≧ 6, that is, after performing 6 retries, the above steps SS2 to S are still performed.
When the condition of S5 is satisfied, the discharge pipe sensor (T
It is determined that h2) has fallen out of the discharge pipe (8d), the process proceeds to step SS9, and abnormal processing for abnormally stopping the air conditioner is performed.
【0032】上記フローにおいて、ステップSS3から
SS9に向かう制御により、請求項1の発明にいう異常
処理手段(53A)が構成され、ステップSS4からS
S9に向かう制御により、請求項2の発明にいう異常処
理手段(53B)が構成され、ステップSS5からSS
9に向かう制御により、請求項3の発明にいう異常処理
手段(53C)が構成されている。In the above flow, the abnormality processing means (53A) according to the invention of claim 1 is constituted by the control from step SS3 to SS9, and steps SS4 to S4.
The control toward S9 constitutes the abnormality processing means (53B) according to the invention of claim 2, and steps SS5 to SS
The control toward 9 constitutes the abnormality processing means (53C) according to the invention of claim 3.
【0033】したがって、上記実施例では、空気調和装
置の運転中、、吐出管センサ(Th2)で検出される吐出
管温度T2が所定温度以上になると、コントローラ(1
0)に内蔵される保護装置(11)が作動して、空気調
和装置が異常停止され、圧縮機(1)が保護される。し
かるに、吐出管センサ(Th2)が吐出管(8d)から脱
落していると、吐出管センサ(Th2)の検出値T2が実
際の吐出温度とは違った値になるので、圧縮機(1)が
過熱して吐出管温度が過上昇していても検出値T2は低
い値となっている。そのため、保護装置(11)が作動
せず、圧縮機(1)の焼損等の事故に至る虞れがある
が、上記実施例では、各ステップSS2〜SS5の判別
により、吐出管センサ(Th2)の脱落が検出されると、
異常処理手段(53)により、空気調和装置が異常停止
されるので、圧縮機(1)の焼損が未然に防止されるこ
とになる。Therefore, in the above embodiment, when the discharge pipe temperature T2 detected by the discharge pipe sensor (Th2) becomes higher than the predetermined temperature during the operation of the air conditioner, the controller (1
The protection device (11) built in 0) is activated, the air conditioner is abnormally stopped, and the compressor (1) is protected. However, if the discharge pipe sensor (Th2) is detached from the discharge pipe (8d), the detected value T2 of the discharge pipe sensor (Th2) becomes a value different from the actual discharge temperature, so the compressor (1) Is overheated and the discharge pipe temperature is excessively increased, the detected value T2 is low. Therefore, the protective device (11) does not operate and may cause an accident such as burnout of the compressor (1). However, in the above-described embodiment, the discharge pipe sensor (Th2) is determined by the determination in each of steps SS2 to SS5. Is detected,
Since the air conditioner is abnormally stopped by the abnormality processing means (53), burnout of the compressor (1) is prevented in advance.
【0034】ここで、ステップSS2の制御で、デフロ
スト運転中でないか否かを判別したのは、デフロスト運
転中には冷媒循環量が非常に多くなるため吐出管温度T
2が非常に低い状態が生じうるので、後のステップにお
ける判別で、吐出管センサ(Th2)が正常に取付けられ
ているのに脱落していると判断する誤検知を防止するた
めである。Here, in the control of step SS2, it is determined whether or not the defrosting operation is being performed, because the refrigerant circulation amount becomes extremely large during the defrosting operation, so that the discharge pipe temperature T
This is to prevent an erroneous detection in which it is determined that the discharge pipe sensor (Th2) is normally attached but has fallen off in the determination in the later step, since 2 may be extremely low.
【0035】また、ステップSS3の制御で、請求項1
の発明に対応して、T2−To2≦5(℃)か否かを判断
したのは、起動後5分を経過すると、通常の条件下では
起動時の吐出管温度To2から10℃程度の吐出管温度T
2の上昇があるはずだからであり、T2−To2≦5
(℃)であれば、吐出管センサ(Th2)が脱落している
可能性が極めて高いからである。Further, according to the control of step SS3,
Corresponding to the invention of No. 2, whether or not T2-To2 ≤ 5 (° C) is determined is that, after 5 minutes have passed after the start, the discharge pipe temperature To2 at the time of start is about 10 ° C under normal conditions. Tube temperature T
Because there should be an increase of 2, T2-To2 ≤ 5
This is because if the temperature is (° C.), it is highly likely that the discharge pipe sensor (Th2) has fallen off.
【0036】また、ステップSS4の制御で、請求項2
の発明に対応して、T2<55(℃)か否かを判別する
ようにしたのは、通常圧縮機(1)の起動後に吐出管温
度T2が55℃よりも低いことはまずないので、T2<
55(℃)の時には吐出管センサ(Th2)が脱落してい
る可能性が極めて高いからである。Further, in the control of step SS4,
According to the invention of (1), whether or not T2 <55 (° C.) is determined is because the discharge pipe temperature T2 is not lower than 55 ° C. after the start of the normal compressor (1). T2 <
This is because it is very likely that the discharge pipe sensor (Th2) has fallen off at 55 (° C).
【0037】さらに、ステップSS5の制御で、請求項
3の発明に対応して、T2<Ta+10か否かを判別し
たのは、吐出管センサ(Th2)が吐出管(8d)から脱
落すると、その後限りなく外気温度Taに近付いてお
り、5分間程度が経過した時に、外気温度よりも10℃
以上上昇していないときには、吐出管センサ(Th2)が
脱落している可能性が極めて高いからである。Further, in the control of step SS5, it is determined whether T2 <Ta + 10 or not in accordance with the invention of claim 3 when the discharge pipe sensor (Th2) falls off from the discharge pipe (8d). Infinitely close to the outside air temperature Ta, and when 5 minutes have passed, it is 10 ° C higher than the outside air temperature.
This is because there is a high possibility that the discharge pipe sensor (Th2) has fallen off when the temperature does not rise above the above.
【0038】特に、上記実施例のように、最適温度演算
手段(51)により、蒸発温度Te,凝縮温度Tc等に
基づき、最適な冷凍効果を与える吐出管温度T2の最適
温度Tkを算出して、開度制御手段(52)により、吐
出管温度T2がこの最適温度Tkに収束するよう電動膨
張弁(5)の開度を制御するようにした場合、吐出管セ
ンサ(Th2)が脱落してその検出値T2が実際の吐出管
温度よりも低いと、上記図4の制御フローにおいて、Δ
T2が実際よりも小さくなり、その結果、ステップST
7の制御で、電動膨張弁(5)の開度が閉じられること
になる。したがって、そのまま運転が継続すると、冷媒
の急激な減少が生じ、圧縮機(1)が短時間のうちに過
熱して焼損に至る危険性が高い。よって、このような吐
出管温度制御を行うシステムに吐出管センサ(Th2)の
脱落検知の制御を適用することにより、著効を発揮する
ことができる。In particular, as in the above embodiment, the optimum temperature calculating means (51) calculates the optimum temperature Tk of the discharge pipe temperature T2 which gives the optimum refrigerating effect based on the evaporation temperature Te, the condensation temperature Tc and the like. When the opening control means (52) controls the opening of the electric expansion valve (5) so that the discharge pipe temperature T2 converges to the optimum temperature Tk, the discharge pipe sensor (Th2) falls off. If the detected value T2 is lower than the actual discharge pipe temperature, Δ in the control flow of FIG.
T2 becomes smaller than actual, and as a result, step ST
By the control of 7, the opening degree of the electric expansion valve (5) is closed. Therefore, if the operation is continued as it is, the refrigerant is rapidly reduced, and there is a high risk that the compressor (1) will be overheated and burned in a short time. Therefore, by applying the control for detecting the drop of the discharge pipe sensor (Th2) to the system for controlling the discharge pipe temperature as described above, the remarkable effect can be exhibited.
【0039】なお、最適温度Tkの算出方法は上記実施
例に限定されるものではなく、外気温度Taで補正する
等の演算を行うことも可能である。The method of calculating the optimum temperature Tk is not limited to the above-mentioned embodiment, and it is also possible to perform a calculation such as correction with the outside air temperature Ta.
【0040】また、上記実施例では、図5の制御フロー
において、各ステップSS3〜SS5の判別結果がすべ
てNOである場合に限って、ステップSS9の異常処理
を行うようにしたが、本発明はかかる実施例に限定され
るものではなく、各ステップSS3〜SS5のいずれか
一つの判別だけを行い、その判別結果がNOの時にステ
ップSS9に移行するようにしてもよい。Further, in the above embodiment, in the control flow of FIG. 5, the abnormality process of step SS9 is performed only when the determination results of steps SS3 to SS5 are all NO. The present invention is not limited to this embodiment, and only one of the steps SS3 to SS5 may be determined, and when the result of the determination is NO, the process may proceed to step SS9.
【0041】[0041]
【発明の効果】以上説明したように、請求項1の発明に
よれば、圧縮機、熱源側熱交換器、電動膨張弁及び利用
側熱交換器を順次接続してなる冷媒回路を備えた冷凍装
置の運転制御装置として、冷凍装置の運転中、吐出管セ
ンサで検出される吐出管温度が所定温度以上になると、
冷凍装置を異常停止させる保護手段を設ける一方、圧縮
機の起動後一定時間経過後における吐出管センサの検出
値と起動時における検出値との温度差が一定温度差以下
のときには、冷凍装置の運転を異常停止させるようにし
たので、吐出管センサの据付時のミスや運転中の事故に
よる脱落を確実に検知して、圧縮機内部温度の過上昇に
よる圧縮機の焼損等の事故を未然に防止することができ
る。As described above, according to the invention of claim 1, the refrigeration provided with the refrigerant circuit in which the compressor, the heat source side heat exchanger, the electric expansion valve and the utilization side heat exchanger are sequentially connected. As the operation control device of the device, when the discharge pipe temperature detected by the discharge pipe sensor becomes equal to or higher than a predetermined temperature during operation of the refrigeration device,
While providing a protective means for abnormally stopping the refrigeration system, if the temperature difference between the detection value of the discharge pipe sensor after the elapse of a certain time after the start of the compressor and the detection value at the start is less than a certain temperature difference, the operation of the refrigeration system Since it is configured to stop abnormally, it is possible to reliably detect a mistake during installation of the discharge pipe sensor or a dropout due to an accident during operation, and prevent accidents such as burnout of the compressor due to excessive rise in internal temperature of the compressor. can do.
【0042】請求項2の発明によれば、圧縮機、熱源側
熱交換器、電動膨張弁及び利用側熱交換器を順次接続し
てなる冷媒回路を備えた冷凍装置の運転制御装置とし
て、冷凍装置の運転中、吐出管センサで検出される吐出
管温度が所定温度以上になると、冷凍装置を異常停止さ
せる保護手段を設ける一方、圧縮機の起動後所定時間経
過後における吐出管センサの検出値が所定値以下のとき
には、冷凍装置の運転を異常停止させるようにしたの
で、吐出管センサの脱落状態を確実に検知して、圧縮機
の内部温度の過上昇による焼損等の事故を未然に防止す
ることができる。According to the second aspect of the present invention, the refrigeration is used as the operation control device of the refrigeration system including the refrigerant circuit in which the compressor, the heat source side heat exchanger, the electric expansion valve and the utilization side heat exchanger are sequentially connected. During operation of the device, if the discharge pipe temperature detected by the discharge pipe sensor exceeds a predetermined temperature, protective means is provided to abnormally stop the refrigeration system, while the value detected by the discharge pipe sensor after a lapse of a predetermined time after starting the compressor When the value is less than a predetermined value, the operation of the refrigeration system is stopped abnormally, so it is possible to reliably detect the falling state of the discharge pipe sensor and prevent accidents such as burnout due to an excessive rise in the internal temperature of the compressor. can do.
【0043】請求項3の発明によれば、圧縮機、熱源側
熱交換器、電動膨張弁及び利用側熱交換器を順次接続し
てなる冷媒回路を備えた冷凍装置の運転制御装置とし
て、冷凍装置の運転中、吐出管センサで検出される吐出
管温度が所定温度以上になると、冷凍装置を異常停止さ
せる保護手段を設ける一方、圧縮機の起動後所定時間経
過後に吐出管センサの検出値が外気温度に一定値を加算
した温度よりも低いときには、冷凍装置の運転を異常停
止させるようにしたので、吐出管センサの脱落状態を確
実に検知して、圧縮機の内部温度の過上昇による焼損等
の事故を未然に防止することができる。According to the third aspect of the invention, the refrigeration is used as the operation control device of the refrigeration system provided with the refrigerant circuit in which the compressor, the heat source side heat exchanger, the electric expansion valve and the utilization side heat exchanger are sequentially connected. During operation of the device, if the discharge pipe temperature detected by the discharge pipe sensor exceeds a predetermined temperature, a protective means is provided for abnormally stopping the refrigeration system, while the detection value of the discharge pipe sensor is detected after a lapse of a predetermined time after starting the compressor. When the temperature is lower than the temperature obtained by adding a certain value to the outside air temperature, the operation of the refrigeration system is stopped abnormally, so the dropout state of the discharge pipe sensor can be reliably detected and the internal temperature of the compressor is excessively increased to cause burnout. It is possible to prevent such accidents.
【0044】請求項4の発明によれば、上記請求項1,
2又は3の発明を、吐出管温度がその最適温度に収束す
るよう電動膨張弁の開度を制御するシステムを有するも
のに適用したので、見掛上の吐出管温度が制御目標値よ
りも小さくなることで電動膨張弁の開度が閉じられ、冷
媒の急激な減少により、圧縮機が短時間のうちに過熱し
て焼損に至る危険性が高いときにも、圧縮機の焼損等の
事故を未然に防止することができ、よって、上記各発明
の著効を発揮することができる。According to the invention of claim 4, the above-mentioned claim 1,
Since the invention of 2 or 3 is applied to the one having the system for controlling the opening degree of the electric expansion valve so that the discharge pipe temperature converges to the optimum temperature, the apparent discharge pipe temperature is smaller than the control target value. As a result, the opening of the electric expansion valve is closed, and even if there is a high risk that the compressor will overheat and burn out in a short time due to the rapid decrease in refrigerant, an accident such as burnout of the compressor will occur. This can be prevented in advance, and thus the remarkable effects of each of the above inventions can be exhibited.
【図1】各請求項の発明の構成を示すブロック図であ
る。FIG. 1 is a block diagram showing the configuration of the invention of each claim.
【図2】実施例に係る空気調和装置の冷媒配管系統図で
ある。FIG. 2 is a refrigerant piping system diagram of the air conditioning apparatus according to the embodiment.
【図3】吐出管センサの吐出管への取付状態を示す分解
斜視図である。FIG. 3 is an exploded perspective view showing how the discharge pipe sensor is attached to the discharge pipe.
【図4】吐出管温度制御の内容を示すフロ―チャ―ト図
である。FIG. 4 is a flowchart showing the contents of discharge pipe temperature control.
【図5】吐出管センサの脱落検知制御の内容を示すフロ
―チャ―ト図である。FIG. 5 is a flowchart showing the details of dropout detection control of the discharge pipe sensor.
【符号の説明】 1 圧縮機 3 室外熱交換器(熱源側熱交換器) 5 電動膨張弁 6 室内熱交換器(利用側熱交換器) 9 冷媒回路 11 保護装置(保護手段) 12 タイマ(計時手段) 51 最適温度演算手段 52 開度制御手段 53 異常処理手段 Th2 吐出管センサ Tha 室外吸込センサ(外気温度検出手段)[Explanation of symbols] 1 compressor 3 outdoor heat exchanger (heat source side heat exchanger) 5 electric expansion valve 6 indoor heat exchanger (use side heat exchanger) 9 refrigerant circuit 11 protection device (protection means) 12 timer (timekeeping) 51) Optimum temperature calculation means 52 Opening degree control means 53 Abnormality processing means Th2 Discharge pipe sensor Tha Outdoor suction sensor (outside air temperature detection means)
フロントページの続き (72)発明者 堀内 正美 大阪府堺市金岡町1304番地 ダイキン工業 株式会社堺製作所金岡工場内 (72)発明者 植野 武夫 大阪府堺市金岡町1304番地 ダイキン工業 株式会社堺製作所金岡工場内Front page continued (72) Inventor Masami Horiuchi 1304 Kanaoka-cho, Sakai City, Osaka Daikin Industries, Ltd.Kanaoka Plant, Sakai Manufacturing Co., Ltd. (72) Takeo Ueno 1304, Kanaoka-cho, Sakai City, Osaka Daikin Industries, Inc. in the factory
Claims (4)
電動膨張弁(5)及び利用側熱交換器(6)を順次接続
してなる冷媒回路(9)を備えた冷凍装置において、 上記圧縮機(1)の吐出管(8d)に取り付けられ、吐
出管温度を検出する吐出管温度センサ(Th2)と、該吐
出管温度センサ(Th2)の出力を受け、吐出管温度が所
定温度以上に達すると、作動して冷凍装置の運転を停止
させる保護手段(11)とを備えるとともに、 圧縮機(1)の起動後の経過時間を計測する計時手段
(12)と、該計時手段(12)の出力を受け、圧縮機
(1)の起動後所定時間が経過したときにおける上記吐
出管センサ(Th2)の検出値と圧縮機(1)の起動時に
おける吐出管センサ(Th2)の検出値との温度差が一定
温度差以下のとき、冷凍装置を異常停止させる異常処理
手段(53A)とを備えたことを特徴とする冷凍装置の
保護装置。1. A compressor (1), a heat source side heat exchanger (3),
A refrigerating apparatus provided with a refrigerant circuit (9) in which an electric expansion valve (5) and a use side heat exchanger (6) are sequentially connected to each other, which is attached to a discharge pipe (8d) of the compressor (1) to discharge A discharge pipe temperature sensor (Th2) for detecting the pipe temperature, and a protection means for receiving the output of the discharge pipe temperature sensor (Th2) and operating when the discharge pipe temperature reaches or exceeds a predetermined temperature to stop the operation of the refrigeration system. (11), and a timer (12) for measuring an elapsed time after starting the compressor (1), and an output of the timer (12) for receiving a predetermined time after starting the compressor (1). When the temperature difference between the detection value of the discharge pipe sensor (Th2) when the temperature has passed and the detection value of the discharge pipe sensor (Th2) at the time of starting the compressor (1) is equal to or less than a certain temperature difference, the refrigeration system is abnormal. It is equipped with an abnormality processing means (53A) for stopping. Characterizing device for refrigeration equipment.
電動膨張弁(5)及び利用側熱交換器(6)を順次接続
してなる冷媒回路(9)を備えた冷凍装置において、 上記圧縮機(1)の吐出管(8d)に取り付けられ、吐
出管温度を検出する吐出管温度センサ(Th2)と、該吐
出管温度センサ(Th2)の出力を受け、吐出管温度が所
定温度以上に達すると、作動して冷凍装置の運転を停止
させる保護手段(11)とを備えるとともに、 圧縮機(1)の起動後の経過時間を計測する計時手段
(12)と、該計時手段(12)の出力を受け、圧縮機
(1)の起動後所定時間が経過したときに上記吐出管セ
ンサ(Th2)の検出値が所定値以下のとき、冷凍装置を
異常停止させる異常処理手段(53B)とを備えたこと
を特徴とする冷凍装置の保護装置。2. A compressor (1), a heat source side heat exchanger (3),
A refrigerating apparatus provided with a refrigerant circuit (9) in which an electric expansion valve (5) and a use side heat exchanger (6) are sequentially connected to each other, which is attached to a discharge pipe (8d) of the compressor (1) to discharge A discharge pipe temperature sensor (Th2) for detecting the pipe temperature, and a protection means for receiving the output of the discharge pipe temperature sensor (Th2) and operating when the discharge pipe temperature reaches or exceeds a predetermined temperature to stop the operation of the refrigeration system. (11), and a timer (12) for measuring an elapsed time after starting the compressor (1), and an output of the timer (12) for receiving a predetermined time after starting the compressor (1). When the detected value of the discharge pipe sensor (Th2) is equal to or less than a predetermined value after the passage of, the refrigerating device protection device is provided with an abnormality processing means (53B) for abnormally stopping the refrigerating device.
電動膨張弁(5)及び利用側熱交換器(6)を順次接続
してなる冷媒回路(9)を備えた冷凍装置において、 上記圧縮機(1)の吐出管(8d)に取り付けられ、吐
出管温度を検出する吐出管温度センサ(Th2)と、該吐
出管温度センサ(Th2)の出力を受け、吐出管温度が所
定温度以上に達すると、作動して冷凍装置の運転を停止
させる保護手段(11)とを備えるとともに、 外気温度を検出する外気温度検出手段(Tha)と、圧縮
機(1)の起動後の経過時間を計測する計時手段(1
2)と、該計時手段(12)の出力を受け、圧縮機
(1)の起動後所定時間が経過したときにおける上記吐
出管センサ(Th2)の検出値が上記外気温度検出手段
(Tha)で検出される外気温度に一定値を加算した温度
よりも低いとき、冷凍装置を異常停止させる異常処理手
段(53C)とを備えたことを特徴とする冷凍装置の保
護装置。3. A compressor (1), a heat source side heat exchanger (3),
A refrigerating apparatus provided with a refrigerant circuit (9) in which an electric expansion valve (5) and a use side heat exchanger (6) are sequentially connected to each other, which is attached to a discharge pipe (8d) of the compressor (1) to discharge A discharge pipe temperature sensor (Th2) for detecting the pipe temperature, and a protection means for receiving the output of the discharge pipe temperature sensor (Th2) and operating when the discharge pipe temperature reaches or exceeds a predetermined temperature to stop the operation of the refrigeration system. (11), the outside air temperature detecting means (Tha) for detecting the outside air temperature, and the time measuring means (1) for measuring the elapsed time after the start of the compressor (1).
2) and the output of the time measuring means (12), the detected value of the discharge pipe sensor (Th2) at the time when a predetermined time has elapsed after the compressor (1) is started is the outside air temperature detecting means (Tha). A protection device for a refrigeration system, comprising: an abnormality processing means (53C) for abnormally stopping the refrigeration system when the temperature is lower than a temperature obtained by adding a constant value to the detected outside air temperature.
護装置において、 冷媒回路(1)の凝縮温度,蒸発温度等に応じて、最適
の冷凍効果を与える吐出冷媒温度の最適温度を演算する
最適温度演算手段(51)と、上記吐出管温度センサ
(Th2)の出力を受け、吐出管温度が上記最適温度演算
手段(51)で演算される最適温度に収束するよう上記
電動膨張弁(5)の開度を制御する開度制御手段(5
2)とを備えたことを特徴とする冷凍装置の保護装置。4. The protection device for a refrigerating apparatus according to claim 1, 2 or 3, wherein an optimum temperature of a discharge refrigerant temperature that gives an optimum refrigerating effect is set in accordance with a condensation temperature, an evaporation temperature, etc. of the refrigerant circuit (1). The electric expansion valve receives the outputs of the optimum temperature calculation means (51) for calculation and the discharge pipe temperature sensor (Th2) and converges the discharge pipe temperature to the optimum temperature calculated by the optimum temperature calculation means (51). Opening control means (5) for controlling the opening of (5)
2) A protection device for a refrigeration system, which is provided with.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP3263684A JP2536354B2 (en) | 1991-10-11 | 1991-10-11 | Refrigerator protection device |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP3263684A JP2536354B2 (en) | 1991-10-11 | 1991-10-11 | Refrigerator protection device |
Publications (2)
Publication Number | Publication Date |
---|---|
JPH0599543A true JPH0599543A (en) | 1993-04-20 |
JP2536354B2 JP2536354B2 (en) | 1996-09-18 |
Family
ID=17392905
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP3263684A Expired - Lifetime JP2536354B2 (en) | 1991-10-11 | 1991-10-11 | Refrigerator protection device |
Country Status (1)
Country | Link |
---|---|
JP (1) | JP2536354B2 (en) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2004087440A1 (en) * | 2003-03-31 | 2004-10-14 | The Yokohama Rubber Co. Ltd. | Sensor system for tire |
EP4092355A1 (en) | 2021-05-19 | 2022-11-23 | Toshiba Carrier Corporation | Heat pump type heat source apparatus |
Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH031061A (en) * | 1989-05-25 | 1991-01-07 | Mitsubishi Electric Corp | Controller for air conditioner |
-
1991
- 1991-10-11 JP JP3263684A patent/JP2536354B2/en not_active Expired - Lifetime
Patent Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH031061A (en) * | 1989-05-25 | 1991-01-07 | Mitsubishi Electric Corp | Controller for air conditioner |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2004087440A1 (en) * | 2003-03-31 | 2004-10-14 | The Yokohama Rubber Co. Ltd. | Sensor system for tire |
US7370522B2 (en) | 2003-03-31 | 2008-05-13 | The Yokohama Rubber Co., Ltd. | Sensor system for tire |
EP4092355A1 (en) | 2021-05-19 | 2022-11-23 | Toshiba Carrier Corporation | Heat pump type heat source apparatus |
Also Published As
Publication number | Publication date |
---|---|
JP2536354B2 (en) | 1996-09-18 |
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