JPH05280810A - Air conditioner - Google Patents
Air conditionerInfo
- Publication number
- JPH05280810A JPH05280810A JP4061862A JP6186292A JPH05280810A JP H05280810 A JPH05280810 A JP H05280810A JP 4061862 A JP4061862 A JP 4061862A JP 6186292 A JP6186292 A JP 6186292A JP H05280810 A JPH05280810 A JP H05280810A
- Authority
- JP
- Japan
- Prior art keywords
- temperature
- compressor
- temperature detection
- detection value
- value
- 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.)
- Pending
Links
Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明は空気調和機に関し、特に
温度検出器を有して圧縮機および冷凍サイクルを制御す
る空気調和機に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an air conditioner, and more particularly to an air conditioner having a temperature detector for controlling a compressor and a refrigeration cycle.
【０００２】[0002]
【従来の技術】本発明に係わる従来の技術としては、ま
ず特開昭61−93359 号公報に示されるように冷凍サイク
ル内の所定位置での温度または圧力を検出することによ
り、圧縮機に異常が発生するような苛酷な運転状況とな
った場合に圧縮機を停止し、圧縮機を確実に保護する技
術があげられる。前記の圧縮機に異常が発生するような
苛酷な運転状況とは、例えば圧縮機の仕様を越えた吐出
圧力または圧縮機用電動機巻線温度の異常上昇が発生す
るような運転状態を指すが、前記特開昭61-93359号では
吐出圧力の保護を目的としているのに対し、圧縮機用電
動機巻線温度の保護については、吐出ガス温度を検知し
て、これが所定値を越えた場合には圧縮機を停止すると
いった制御方法が一般的である。2. Description of the Related Art As a prior art relating to the present invention, first, as shown in Japanese Patent Application Laid-Open No. 61-93359, a compressor malfunctions by detecting the temperature or pressure at a predetermined position in a refrigeration cycle. There is a technology for surely protecting the compressor by stopping the compressor in a severe operating condition such as the occurrence of. The severe operating condition in which an abnormality occurs in the compressor refers to an operating state in which, for example, a discharge pressure exceeding the specifications of the compressor or an abnormal increase in the compressor motor winding temperature occurs. The above-mentioned Japanese Patent Laid-Open No. 61-93359 aims to protect the discharge pressure, whereas the compressor motor winding temperature is protected by detecting the discharge gas temperature, and when this exceeds a predetermined value. A general control method is to stop the compressor.
【０００３】次に、本発明に係わる他の従来技術として
特開昭62−69069 号公報に示されるように吐出ガス温度
がある所定の条件を満たした場合に電子制御膨張弁のよ
うな開度調整可能な絞り機構を制御することにより、圧
縮機の仕様範囲内の適正な使用状態を確保するといった
技術があげられる。この特開昭62−69069 号においては
バイパス管路の冷媒流量調節のために吐出ガス温度を用
いて絞り機構の制御を行なっているが、冷凍サイクルの
主膨張機構の開度制御を行なうためには、吐出圧力によ
って吐出ガス温度が著しく変化することを考慮して、吐
出ガス温度のみで開度制御するのではなく、吐出ガス過
熱度を用いて絞り機構を制御する方法が一般的である。Next, as another prior art related to the present invention, as shown in Japanese Patent Laid-Open No. 62-69069, when the discharge gas temperature satisfies a predetermined condition, an opening degree like an electronically controlled expansion valve is provided. By controlling an adjustable throttling mechanism, there is a technique for ensuring an appropriate usage condition within the specification range of the compressor. In this Japanese Laid-Open Patent Publication No. 62-69069, the throttle mechanism is controlled by using the discharge gas temperature in order to adjust the refrigerant flow rate in the bypass pipe, but in order to control the opening degree of the main expansion mechanism of the refrigeration cycle. In consideration of the fact that the discharge gas temperature significantly changes depending on the discharge pressure, a general method is to control the throttle mechanism by using the discharge gas superheat degree instead of controlling the opening degree only by the discharge gas temperature.
【０００４】[0004]
【発明が解決しようとする課題】しかしながら、前記の
従来技術においては圧縮機の保護あるいは絞り機構の開
度制御に吐出ガス冷媒温度を用いているため、以下のよ
うな問題がある。However, in the above-mentioned prior art, since the discharge gas refrigerant temperature is used for the protection of the compressor or the opening control of the throttle mechanism, there are the following problems.
【０００５】第１に圧縮機の起動時においては、電動機
巻線温度や圧縮機外殻の温度が低く、特に高圧ガス冷媒
により電動機巻線温度の冷却を行なうような密閉型の高
圧チャンバ式圧縮機においては、圧縮機外殻の熱容量に
相当する熱量が吐出ガスから奪われるため、吐出ガスの
温度上昇速度が遅くなるのに対し、電動機巻線温度上昇
速度が非常に速いという場合がある。この場合、次の２
つの弊害が生じる。First, at the time of starting the compressor, the temperature of the electric motor winding and the temperature of the outer shell of the compressor are low, and in particular, the temperature of the electric motor winding is cooled by a high pressure gas refrigerant, which is a closed type high pressure chamber type compression. In the machine, since the amount of heat corresponding to the heat capacity of the outer shell of the compressor is taken from the discharge gas, the temperature rise speed of the discharge gas becomes slow, whereas the temperature rise speed of the motor winding may be very fast. In this case,
There are two adverse effects.
【０００６】(１) 吐出ガス温度の異常上昇を検知して
圧縮機を停止した時には既に電動機巻線温度が許容限界
を越えて上昇しており、圧縮機の信頼性を低下させる。(1) When the compressor is stopped by detecting an abnormal rise in the discharge gas temperature, the motor winding temperature has already risen beyond the allowable limit, which lowers the reliability of the compressor.
【０００７】(２) 圧縮機起動時の吐出ガス温度の上昇
速度に対し、吐出圧力の上昇は一般的に速いため、吐出
ガス過熱度の演算値は見かけ上非常に低くなる。この吐
出ガス過熱度演算値を用いて絞り機構の開度制御を行な
った場合には、開度を絞り方向に制御して吐出ガス過熱
度を所定値まで引上げるように動作するため、結果とし
て冷媒循環量が減少して電動機巻線の冷却能力が低下
し、更に電動機巻線温度上昇を助長して圧縮機の信頼性
を低下させる。(2) Since the discharge pressure generally rises rapidly with respect to the discharge gas temperature rising speed at the time of starting the compressor, the calculated value of the discharge gas superheat degree is apparently very low. When the aperture control of the throttle mechanism is performed using this discharge gas superheat calculation value, the aperture is controlled in the throttle direction to operate so as to raise the discharge gas superheat to a predetermined value. The amount of refrigerant circulation is reduced, the cooling capacity of the motor winding is reduced, and further the temperature increase of the motor winding is promoted to reduce the reliability of the compressor.
【０００８】第２に冷凍サイクル内に密閉された冷媒量
が少ない場合や、ヒートポンプサイクルを形成した場合
に必要な除霜動転の直後に室外熱交換機内に多量の液冷
媒が残るような場合には、冷媒循環量が減少して電動機
巻線の冷却能力が低下する上に、単位冷媒量あたりの圧
縮機外殻からの放熱量が大で吐出ガス温度の上昇が低い
ため、前記と同様の現象により、圧縮機の信頼性を低下
させるという問題がある。Secondly, when the amount of the refrigerant sealed in the refrigeration cycle is small, or when a large amount of the liquid refrigerant remains in the outdoor heat exchanger immediately after the defrosting operation required when the heat pump cycle is formed. Is the same as the above because the amount of refrigerant circulation decreases and the cooling capacity of the motor winding decreases, and the amount of heat radiated from the compressor shell per unit amount of refrigerant is large and the rise in discharge gas temperature is low. Due to the phenomenon, there is a problem that the reliability of the compressor is reduced.
【０００９】本発明の目的は、以上のように圧縮機起動
後あるいは冷媒循環量が減少するような場合においても
確実に電動機巻線温度の過昇を防止し、圧縮機を保護す
ることにある。An object of the present invention is to reliably prevent the motor winding temperature from excessively rising and protect the compressor even after the compressor is started or the refrigerant circulation amount is reduced as described above. .
【００１０】[0010]
【課題を解決するための手段】前記目的は、圧縮機内部
の高圧吐出部近傍の外殻温度を検出すべく設けられた第
１の温度検出手段と、圧縮機の吐出ガス温度を検出すべ
く吐出側管路に設けられた第２の温度検出手段とを設
け、それぞれの温度検出値を選択して制御に用いること
により、以下のようにして達成することができる。The object is to detect the temperature of the gas discharged from the compressor, and a first temperature detecting means provided to detect the temperature of the outer shell in the vicinity of the high pressure discharge portion inside the compressor. By providing the second temperature detecting means provided in the discharge side pipe line, and selecting each temperature detection value and using it for control, the following can be achieved.
【００１１】すなわち、第１の温度検出手段の温度検出
値は、圧縮機用電動機の冷却及び圧縮機外殻からの放熱
をする前の高圧冷媒ガス温度を検出するため、圧縮機起
動時や冷媒循環量が少ない場合においても電動機巻線温
度上昇と同様に速やかに上昇するのに対し、第２の温度
検出手段の温度検出値は、電動機の冷却，外殻からの放
熱に影響されて温度上昇速度がゆるやかであるという特
性を有する。一方、温度上昇が定常となってからの挙動
は、第１の温度検出手段の温度検出値は室内外負荷の変
動によって変化しやすいのに対し、第２の温度検出手段
の温度検出値は変化が少なく安定しており、開度制御に
用いる場合、第２の温度検出手段の温度検出値を用いた
方がより安定した制御が可能となる。従って、所定の選
択条件として、(１) 圧縮機の運転起動後の所定期間、
あるいは、(２) 第１の温度検出手段の温度検出値が、
第２の温度検出手段の温度検出値に対し所定温度差以上
に高くなる期間、と設定し、本条件に合致する期間は第
１の温度検出手段の温度検出値を電動機巻線温度過昇防
止制御（所定値で圧縮機停止）や絞り機構の開度制御
（吐出ガス過熱度を所定値に維持）に用い、(１)，(２)
以外の期間は第２の温度検出手段の温度検出値を用いる
ようにすれば、従来に対し、確実に電動機巻線温度の過
昇を防止し、圧縮機を保護することが可能となる。That is, the temperature detection value of the first temperature detecting means detects the temperature of the high-pressure refrigerant gas before the cooling of the electric motor for the compressor and the radiation of heat from the outer shell of the compressor. Even when the circulation amount is small, the temperature rises promptly like the temperature rise of the electric motor winding, whereas the temperature detection value of the second temperature detecting means is affected by cooling of the electric motor and heat radiation from the outer shell to raise the temperature. It has the characteristic of slow speed. On the other hand, regarding the behavior after the temperature rise becomes steady, the temperature detection value of the first temperature detecting means is likely to change due to the fluctuation of the indoor and outdoor loads, whereas the temperature detection value of the second temperature detecting means changes. When the opening degree control is used, more stable control becomes possible by using the temperature detection value of the second temperature detecting means. Therefore, as the predetermined selection conditions, (1) a predetermined period after the start of operation of the compressor,
Alternatively, (2) the temperature detection value of the first temperature detection means is
A period in which the temperature detection value of the second temperature detection unit is higher than a predetermined temperature difference is set, and the temperature detection value of the first temperature detection unit is set to prevent the motor winding temperature from rising excessively during the period when this condition is met. Used for control (compressor stops at a predetermined value) and throttle mechanism opening control (maintaining discharge gas superheat at a predetermined value), (1), (2)
If the temperature detection value of the second temperature detecting means is used during the periods other than the above, it is possible to reliably prevent the motor winding temperature from excessively rising and protect the compressor as compared with the conventional case.
【００１２】なお、圧縮機の吸入ガス過熱度が低く、液
戻りが発生した場合には、圧縮機外殻に設けた第１の温
度検出手段の温度検出値が第２の温度検出手段の温度検
出値に対して低くなることも考えられる。このような冷
凍サイクルにあっては、電動機巻線温度過昇防止のため
第１または第２の温度検出手段の温度検出値のうち高い
方の温度検出値が所定値に達した場合に、圧縮機を停止
する制御手段が考えられ、より確実に圧縮機を保護する
ことが可能となる。When the superheat of suction gas of the compressor is low and liquid return occurs, the temperature detection value of the first temperature detecting means provided in the outer shell of the compressor is equal to the temperature of the second temperature detecting means. It may be lower than the detected value. In such a refrigeration cycle, when the higher temperature detection value of the temperature detection values of the first or second temperature detection means reaches a predetermined value in order to prevent the motor winding temperature from rising excessively, compression is performed. A control means for stopping the compressor can be considered, and the compressor can be protected more reliably.
【００１３】[0013]
【作用】本発明の特徴となる構成部材は、圧縮機内部の
高圧吐出部近傍の外殻に設けられた温度検出手段と、吐
出側管路に設けられた温度検出手段の２つである。The two constituent members that characterize the present invention are the temperature detecting means provided in the outer shell near the high-pressure discharge portion inside the compressor and the temperature detecting means provided in the discharge side pipeline.
【００１４】圧縮機内部の高圧吐出部近傍の外殻に設け
られた温度検出手段は、圧縮機起動時や冷媒循環量が少
ない時など、吐出側管路内の高圧冷媒ガスの温度上昇速
度が遅い場合に、電動機巻線温度の過昇防止や絞り開度
を制御するための吐出ガス過熱度を演算するのに用いる
温度検出機構として作用する。The temperature detecting means provided in the outer shell in the vicinity of the high-pressure discharge portion inside the compressor determines the temperature rising rate of the high-pressure refrigerant gas in the discharge-side pipe line when the compressor is started or when the refrigerant circulation amount is small. When it is slow, it functions as a temperature detection mechanism used to calculate the degree of superheat of the discharge gas for preventing the motor winding temperature from overheating and controlling the throttle opening.
【００１５】吐出側管路に設けられた温度検出手段は、
前記の圧縮機の外殻に設けられた温度検出手段との検出
温度差が所定値以下となった場合に、より安定した温度
検出値を示し、前記電動機巻線温度の過昇防止や絞り開
度を制御するための吐出ガス過熱度を演算するのに用い
る温度検出手段として作用する。The temperature detecting means provided in the discharge side conduit is
When the detected temperature difference from the temperature detecting means provided in the outer shell of the compressor is less than or equal to a predetermined value, a more stable temperature detected value is shown, and the excessive rise of the motor winding temperature is prevented and the throttle opening is prevented. It functions as a temperature detecting means used for calculating the discharge gas superheat degree for controlling the temperature.
【００１６】[0016]
【実施例】以下、本発明の一実施例を図１及び図２を用
いて説明する。DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to FIGS.
【００１７】図２は本発明の一実施例の空気調和機のサ
イクル系統図を示す。圧縮機１より吐出された高圧ガス
冷媒は冷房運転を行なう場合、四方切換弁６を通って室
外熱交換器２に至り、外気と熱交換して高圧の液冷媒と
なる。この高圧液冷媒は電子膨張弁３に至って減圧，膨
張され低圧の二相冷媒となって室内熱交換器４に流入
し、被空調室内の空気より熱を奪い低圧ガスとなる。こ
の低圧ガスは再び四方切換弁６を通ってアキュムレータ
５に至り、圧縮機１に吸入されて圧縮され高圧ガス冷媒
となり、以下このサイクルを繰り返す。本実施例におい
ては四方切換弁６を切換え、高圧冷媒ガスを室内熱交換
器４へ送り込みヒートポンプサイクルを構成することも
可能となっている。圧縮機１は高圧チャンバ式であり、
また圧縮機１の左右に示す太い矢印は冷媒の流れ方向を
示す。すなわち図２においては、冷媒は圧縮機１の右側
より吸入され、左側より吐出される。図２において、圧
縮機１の上部に設置された圧縮機サーミスタ７は圧縮機
１内部の高圧吐出部近傍の外殻に設置され、圧縮機１内
部の高圧ガスの温度を直ちに検出可能となっている。吐
出配管に設置された吐出配管サーミスタ８は、圧縮機１
の電動機を冷却し、圧縮機１の外殻を通して放熱した後
の吐出ガス冷媒の温度を検出する。電子膨張弁開度制御
機構１０は、圧力センサ９の吐出圧力検出値と圧縮機サ
ーミスタ７もしくは吐出配管サーミスタ８のうち下記の
制御動作により選択された方の温度検出値から吐出ガス
過熱度を演算し、これを所定値に維持すべく、電子膨張
弁３の開度制御を行なう。また、圧縮機サーミスタ７も
しくは吐出配管サーミスタ８のうち選択された方の温度
検出値が所定値に達した場合、電動機巻線温度過昇とし
て圧縮機を停止する。FIG. 2 shows a cycle system diagram of the air conditioner of one embodiment of the present invention. When performing a cooling operation, the high-pressure gas refrigerant discharged from the compressor 1 reaches the outdoor heat exchanger 2 through the four-way switching valve 6 and exchanges heat with the outside air to become a high-pressure liquid refrigerant. This high-pressure liquid refrigerant reaches the electronic expansion valve 3, is decompressed and expanded to become a low-pressure two-phase refrigerant, flows into the indoor heat exchanger 4, takes heat from the air in the air-conditioned room, and becomes a low-pressure gas. This low-pressure gas again passes through the four-way switching valve 6 to reach the accumulator 5, is sucked into the compressor 1 and is compressed into a high-pressure gas refrigerant, and this cycle is repeated thereafter. In this embodiment, it is possible to switch the four-way switching valve 6 and send the high pressure refrigerant gas to the indoor heat exchanger 4 to form a heat pump cycle. The compressor 1 is a high pressure chamber type,
The thick arrows on the left and right of the compressor 1 indicate the flow direction of the refrigerant. That is, in FIG. 2, the refrigerant is sucked from the right side of the compressor 1 and discharged from the left side. In FIG. 2, the compressor thermistor 7 installed in the upper part of the compressor 1 is installed in the outer shell near the high-pressure discharge part inside the compressor 1, and the temperature of the high-pressure gas inside the compressor 1 can be immediately detected. There is. The discharge pipe thermistor 8 installed in the discharge pipe is the compressor 1
The temperature of the discharge gas refrigerant after cooling the electric motor and radiating heat through the outer shell of the compressor 1 is detected. The electronic expansion valve opening control mechanism 10 calculates the discharge gas superheat degree from the discharge pressure detection value of the pressure sensor 9 and the temperature detection value of the compressor thermistor 7 or the discharge pipe thermistor 8 which is selected by the following control operation. Then, the opening degree of the electronic expansion valve 3 is controlled to maintain it at a predetermined value. When the detected temperature value of the selected one of the compressor thermistor 7 and the discharge pipe thermistor 8 reaches a predetermined value, the temperature of the motor winding is overheated and the compressor is stopped.
【００１８】本実施例における制御動作を図１を用いて
説明する。時刻ｔ0 において圧縮機が起動すると吐出配
管温度Ｔd が安定する時刻ｔ2 までの期間は図１に示す
ごとく、圧縮機巻線温度と圧縮機外殻の高圧吐出部近傍
に設置されたサーミスタ７部の温度Ｔc0（図２に破線で
示す）の上昇速度が速く、吐出配管温度Ｔd の上昇速度
はゆるやかである。これは、冷媒が圧縮機１内部の吐出
口から吐出された後、圧縮機用電動機と圧縮機外殻の低
温部に熱を奪われるためである。本実施例においては所
定時間ｔ1 経過後、Ｔc0とＴd の温度差が所定値に達す
る時刻ｔ2 までは電動機巻線保護および吐出ガス過熱温
度演算のための温度検出値としてＴc0を用い、以後Ｔc0
とＴd の温度差が所定値内である期間は圧縮機が停止す
る時刻ｔ3 まで前記温度検出値としてＴd を用いる。The control operation in this embodiment will be described with reference to FIG. Period until time t 2 when the time t 0 the discharge pipe temperature T d and the compressor is started in is stabilized as shown in FIG. 1, a thermistor installed near the high pressure discharge portion of the compressor winding temperature and the outside of the compressor shell The temperature T c0 of the 7th part (indicated by a broken line in FIG. 2) rises quickly, and the discharge pipe temperature T d rises slowly. This is because after the refrigerant is discharged from the discharge port inside the compressor 1, heat is taken by the low temperature portion of the compressor motor and the compressor outer shell. After a predetermined time t 1 has elapsed in this embodiment, to time t 2 the temperature difference T c0 and T d reaches a predetermined value the T c0 as a temperature detection value for the motor windings protection and discharge gas superheat operation Used, and then T c0
While the temperature difference between T d and T d is within a predetermined value, T d is used as the temperature detection value until time t 3 when the compressor stops.
【００１９】本実施例によれば、圧縮機起動後の電動機
巻線温度の上昇が速い期間は、それと同様の上昇速度を
有するＴc0を温度検出値として取込むため、電動機巻線
温度の過昇を防止できるという効果がある。また、吐出
ガス過熱度も所定値に対して過度に小さい演算値となら
ないため、電子膨張弁３の開度を絞り過ぎて冷媒循環量
を減少させ、電動機巻線温度の上昇を助長する事態を回
避できるという効果がある。更に、Ｔd が安定した後は
これを温度検出値として用いるため、少しの条件変化で
図１に示すごとく変動しやすいＴc0に対して、安定し
た、電子膨張弁３の開度変化が少ない運転を継続できる
という効果がある。According to the present embodiment, during the period in which the motor winding temperature rises rapidly after the compressor is started, Tc0 having the same rising speed is taken in as the temperature detection value, so that the motor winding temperature is overheated. The effect is that rising can be prevented. Further, since the discharge gas superheat degree does not become an excessively small calculated value with respect to a predetermined value, the opening degree of the electronic expansion valve 3 is excessively narrowed to reduce the refrigerant circulation amount, which promotes the rise of the motor winding temperature. The effect is that it can be avoided. Furthermore, since T d is used as a temperature detection value after it has stabilized, a stable change in the opening degree of the electronic expansion valve 3 is small with respect to T c0 which tends to fluctuate as shown in FIG. The effect is that the operation can be continued.
【００２０】次に、除霜運転終了後など運転中に過渡的
に冷媒循環量が少なくなった場合や冷媒過少封入時など
の制御動作については、図１のｔ4〜ｔ5の期間に示す通
り、前記と同様にＴc0とＴd の温度差が所定値以上に開
くようになる。これは、冷媒循環量が少ない場合、圧縮
機用電動機に奪われる、あるいは圧縮機外殻から放熱す
る単位冷媒量あたりの熱量が増加するためである。本実
施例においては、このようにＴc0がＴd に対して所定温
度差を越えて高くなった場合に、電動機巻線保護および
吐出ガス過熱度演算のための温度検出値としてＴc0を用
いることとする。このため、前記の圧縮機起動時と同様
に、電動機巻線温度過昇防止や電子膨張弁３の開度制御
の適正化に効果がある。Next, control operations such as when the refrigerant circulation amount is transiently reduced during operation such as after the defrosting operation is completed or when the refrigerant is underfilled are shown in the period from t 4 to t 5 in FIG. As described above, similarly to the above, the temperature difference between T c0 and T d opens above a predetermined value. This is because when the refrigerant circulation amount is small, the amount of heat per unit amount of refrigerant radiated from the compressor motor or radiated from the compressor outer shell increases. In this embodiment, when T c0 becomes higher than T d by exceeding the predetermined temperature difference, T c0 is used as a temperature detection value for motor winding protection and discharge gas superheat calculation. I will. Therefore, as in the case of starting the compressor, it is effective in preventing the motor winding temperature from rising excessively and optimizing the opening control of the electronic expansion valve 3.
【００２１】[0021]
【発明の効果】本発明によれば、圧縮機起動後および冷
媒循環量が減少し、圧縮機内部の高圧吐出部付近に設け
られた第１の温度検出手段の温度検出値が、吐出ガス温
度を検出する第２の温度検出手段の温度検出値に対して
高くなる場合には第１の温度検出手段の温度検出値を用
いて圧縮機用電動機巻線温度の過昇保護と絞り機構の開
度制御を行なうことができる。従って、圧縮機起動後お
よび冷媒循環量が減少して電動機巻線温度が吐出ガス温
度に対して非常に高くなるような場合においても、電動
機巻線温度の過昇を防止でき、確実に圧縮機を保護でき
るという効果がある。According to the present invention, after the compressor is started and the refrigerant circulation amount is reduced, the temperature detection value of the first temperature detecting means provided near the high pressure discharge portion inside the compressor is the discharge gas temperature. When it becomes higher than the temperature detection value of the second temperature detection means for detecting the temperature, the temperature detection value of the first temperature detection means is used to protect the compressor motor winding temperature from excessive rise and open the throttle mechanism. Degree control can be performed. Therefore, even after the compressor is started and when the refrigerant circulation amount decreases and the motor winding temperature becomes extremely higher than the discharge gas temperature, it is possible to prevent the motor winding temperature from rising excessively, and to ensure the compressor. Has the effect of protecting
【図１】本発明の一実施例の圧縮機のコイル温度とサー
ミスタ検知温度の時間変化を示す線図である。FIG. 1 is a diagram showing a time change of a coil temperature and a thermistor detection temperature of a compressor according to an embodiment of the present invention.
【図２】本発明の一実施例の冷凍サイクル系統図を示
す。FIG. 2 shows a refrigeration cycle system diagram of an embodiment of the present invention.
１…圧縮機、２…室外熱交換器、３…電子膨張弁、４…
室内熱交換器、５…アキュムレータ、６…四方切換弁、
７…圧縮機サーミスタ、８…吐出配管サーミスタ、９…
圧力センサ、１０…電子膨張弁開度制御機構。1 ... Compressor, 2 ... Outdoor heat exchanger, 3 ... Electronic expansion valve, 4 ...
Indoor heat exchanger, 5 ... Accumulator, 6 ... Four-way switching valve,
7 ... Compressor thermistor, 8 ... Discharge pipe thermistor, 9 ...
Pressure sensor, 10 ... Electronic expansion valve opening control mechanism.
───────────────────────────────────────────────────── フロントページの続き (72)発明者 栗田 佳明 静岡県清水市村松390番地 日立清水エン ジニアリング株式会社内 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Yoshiaki Kurita 390 Muramatsu, Shimizu City, Shizuoka Prefecture Hitachi Shimizu Engineering Co., Ltd.
Claims (4)
縮機内部の高圧吐出部近傍の外殻温度を検出すべく設け
られた第１の温度検出手段、該圧縮機の吐出ガス温度を
検出すべく吐出側管路に設けられた第２の温度検出手
段、及び前記第１，第２の温度検出手段からの検出値に
基づいて空気調和機の運転状態を制御する制御装置を有
することを特徴とする空気調和機。1. An air conditioner having a compressor, wherein a first temperature detecting means is provided for detecting an outer shell temperature in the vicinity of a high pressure discharge portion inside the compressor, and a discharge gas temperature of the compressor is detected. In order to do so, it has a second temperature detecting means provided in the discharge side pipeline, and a control device for controlling the operating state of the air conditioner based on the detection values from the first and second temperature detecting means. A characteristic air conditioner.
に、吐出ガス圧力検出手段と冷媒循環量を制御可能な絞
り機構を有し、第１もしくは第２の温度検出機構の温度
検出値と前記吐出ガス圧力検出手段の圧力検出値を用い
て吐出冷媒ガスの過熱度を演算し、この演算値を所定の
値に維持すべく前記の絞り機構を制御し、かつ吐出ガス
過熱度の演算に用いる温度検出値として、 (１) 圧縮機の運転起動後の所定期間、あるいは、 (２) 第１の温度検出手段の温度検出値が第２の温度検
出手段の温度検出値に対し所定温度差以上に高くなる期
間、は、第１の温度検出手段の温度検出値を用い、前記
(１)，(２)以外の期間は第２の温度検出手段の温度検出
値を用いることを特徴とする空気調和機。2. The air conditioner according to claim 1, further comprising a discharge gas pressure detection means and a throttle mechanism capable of controlling a refrigerant circulation amount, and a temperature detection value of the first or second temperature detection mechanism. And calculating the superheat degree of the discharge refrigerant gas using the pressure detection value of the discharge gas pressure detecting means, controlling the throttle mechanism to maintain the calculated value at a predetermined value, and calculating the discharge gas superheat degree. As the temperature detection value used for (1) a predetermined period after the start of operation of the compressor, or (2) the temperature detection value of the first temperature detection means is a predetermined temperature with respect to the temperature detection value of the second temperature detection means. During the period when the difference becomes higher than the difference, the temperature detection value of the first temperature detecting means is used,
An air conditioner characterized in that the temperature detection value of the second temperature detection means is used during periods other than (1) and (2).
１もしくは第２の温度検出手段の温度検出値が所定値に
達した場合に圧縮機への通電を停止し、圧縮機の電動機
巻線温度の過昇を保護する制御手段を有し、前記所定値
として、 (１) 圧縮機の運転起動後の所定期間、あるいは、 (２) 第１の温度検出手段の温度検出値が第２の温度検
出手段の温度検出値に対し所定温度差以上に高くなる期
間、は、第１の温度検出手段の温度検出値を用い、前記
(１)，(２)以外の期間は第２の温度検出手段の温度検出
値を用いることを特徴とする空気調和機。3. The air conditioner according to claim 1, wherein when the temperature detection value of the first or second temperature detecting means reaches a predetermined value, the energization of the compressor is stopped and the electric motor of the compressor. A control means for protecting the winding temperature from excessive rise is provided, and the predetermined value is (1) a predetermined period after the start of operation of the compressor, or (2) a temperature detection value of the first temperature detection means. The temperature detection value of the first temperature detection means is used for the period in which the temperature detection value of the second temperature detection means is higher than the predetermined temperature difference by a predetermined temperature difference or more.
An air conditioner characterized in that the temperature detection value of the second temperature detection means is used during periods other than (1) and (2).
１，第２の温度検出手段の温度検出値のうち、高い方の
温度検出値が所定値に達した場合に圧縮機を停止し、圧
縮機の電動機巻線温度の過昇を防止することを特徴とす
る空気調和機。4. The air conditioner according to claim 1, wherein the compressor is stopped when the higher temperature detection value of the temperature detection values of the first and second temperature detection means reaches a predetermined value. In addition, the air conditioner is characterized in that it prevents the temperature of the motor winding of the compressor from rising excessively.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP4061862A JPH05280810A (en) | 1992-03-18 | 1992-03-18 | Air conditioner |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP4061862A JPH05280810A (en) | 1992-03-18 | 1992-03-18 | Air conditioner |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH05280810A true JPH05280810A (en) | 1993-10-29 |
Family
ID=13183353
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP4061862A Pending JPH05280810A (en) | 1992-03-18 | 1992-03-18 | Air conditioner |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH05280810A (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2007510568A (en) * | 2003-10-02 | 2007-04-26 | バイエリッシェ モートーレン ウエルケ アクチエンゲゼルシャフト | Sensor device for monitoring at least two physical quantities |
| JP2011237095A (en) * | 2010-05-10 | 2011-11-24 | Fujitsu General Ltd | Air conditioner |
| CN109631228A (en) * | 2019-01-31 | 2019-04-16 | 四川长虹空调有限公司 | The determination method and system of refrigeration system refrigerant fast leak |
| WO2023005531A1 (en) * | 2021-07-30 | 2023-02-02 | 美的集团股份有限公司 | Control method and apparatus for air conditioner, and storage medium and air conditioner |
-
1992
- 1992-03-18 JP JP4061862A patent/JPH05280810A/en active Pending
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2007510568A (en) * | 2003-10-02 | 2007-04-26 | バイエリッシェ モートーレン ウエルケ アクチエンゲゼルシャフト | Sensor device for monitoring at least two physical quantities |
| JP4701178B2 (en) * | 2003-10-02 | 2011-06-15 | バイエリッシェ モートーレン ウエルケ アクチエンゲゼルシャフト | Sensor device for monitoring at least two physical quantities |
| JP2011237095A (en) * | 2010-05-10 | 2011-11-24 | Fujitsu General Ltd | Air conditioner |
| CN109631228A (en) * | 2019-01-31 | 2019-04-16 | 四川长虹空调有限公司 | The determination method and system of refrigeration system refrigerant fast leak |
| WO2023005531A1 (en) * | 2021-07-30 | 2023-02-02 | 美的集团股份有限公司 | Control method and apparatus for air conditioner, and storage medium and air conditioner |
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