JPH0518617A - Controller of refrigerator - Google Patents

Controller of refrigerator

Info

Publication number
JPH0518617A
JPH0518617A JP3170185A JP17018591A JPH0518617A JP H0518617 A JPH0518617 A JP H0518617A JP 3170185 A JP3170185 A JP 3170185A JP 17018591 A JP17018591 A JP 17018591A JP H0518617 A JPH0518617 A JP H0518617A
Authority
JP
Japan
Prior art keywords
compressor
pressure sensor
output
pressure
alternating current
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
Application number
JP3170185A
Other languages
Japanese (ja)
Inventor
Kimio Fushimi
見 公 男 伏
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.)
Toshiba Corp
Original Assignee
Toshiba Corp
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 Toshiba Corp filed Critical Toshiba Corp
Priority to JP3170185A priority Critical patent/JPH0518617A/en
Publication of JPH0518617A publication Critical patent/JPH0518617A/en
Pending legal-status Critical Current

Links

Abstract

PURPOSE:To provide a controller of refrigerator for which it is possible to protect the compressor and secure refrigerating capability even when the value of pressure detection has no change for a long time due to a trouble in the pressure sensor that detects the coolant pressure on the side of the suction of a compressor. CONSTITUTION:A power converter 2 drives a compressor 1 by converting the alternating current of a commercial electric power or that of private power generation to an alternating current of variable frequency. A pressure sensor 4 detects the pressure of the coolant on the side of the suction of a compressor 1 by a pressure sensor 4. The control circuit 3 controls the output frequency of the electric power converter according to the output of the pressure sensor 4 and, at the same time, an electromagnetic switches 5, 6 are opened and an electromagnetic switch 7 is closed when there is no change in the output of said pressure sensor 4 in a set time in order to connect the compressor directly to the commercial power or the power of private power generation.

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、冷凍サイクルを形成す
る圧縮機の吸込み側圧力を検出し、その検出圧力に応じ
て該圧縮機を能力制御運転する冷凍機の制御装置に関す
る。
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a controller for a refrigerating machine which detects a suction side pressure of a compressor forming a refrigerating cycle and carries out capacity control operation of the compressor according to the detected pressure.

【0002】[0002]

【従来の技術】図3は従来の冷凍機の制御装置の概略構
成図である。同図において、冷凍サイクルを形成する圧
縮機1は、商用電源の三相交流を、可変周波数の交流に
変換する電力変換装置(以下、インバータ装置と言う)
2によって駆動される。このインバータ装置2は三相交
流を直流に変換するコンバータ部と、直流を可変周波数
の交流に変換するインバータ部とでなり、制御回路3Aは
インバータ部を構成するスイッチング素子をオン、オフ
制御する。この場合、圧縮機1の吸込み側に設けられた
圧力センサ4の検出圧力が設定値よりも高くなれば制御
回路3Aはインバータ装置2の出力周波数を上げ、逆に、
圧力センサ4の検出圧力が設定値より低くなれば制御回
路3Aはインバータ装置2の出力周波数を下げる。なお、
インバータ装置2の電源側に電磁開閉器5が設けられ、
運転、停止指令に応じて制御回路3Aがこれを開閉制御す
る。
2. Description of the Related Art FIG. 3 is a schematic configuration diagram of a conventional refrigerator control device. In the figure, a compressor 1 that forms a refrigeration cycle includes a power conversion device (hereinafter referred to as an inverter device) that converts a three-phase alternating current of a commercial power source into a variable frequency alternating current.
Driven by two. The inverter device 2 is composed of a converter section for converting three-phase alternating current into direct current and an inverter section for converting direct current into alternating current of variable frequency, and the control circuit 3A controls on / off of the switching elements forming the inverter section. In this case, if the pressure detected by the pressure sensor 4 provided on the suction side of the compressor 1 becomes higher than the set value, the control circuit 3A raises the output frequency of the inverter device 2, and conversely,
If the pressure detected by the pressure sensor 4 becomes lower than the set value, the control circuit 3A lowers the output frequency of the inverter device 2. In addition,
An electromagnetic switch 5 is provided on the power source side of the inverter device 2,
The control circuit 3A controls the opening / closing of the operation / stop command in response to the command.

【0003】図4は制御回路3Aの処理手順の一例を示し
たものである。ここで、制御回路3Aは運転指令に応じて
電磁開閉器5を投入する (ステップ101)。そして、所定
の周波数の交流が圧縮機1に加わるようにインバータ装
置2を制御する (ステップ102)。そこで、圧縮機1が駆
動されると圧力センサ4の出力値、すなわち、圧縮機の
吸込み側の圧力を読取る (ステップ103)。続いて、吸込
み側圧力Ps に対する設定値Psrefと検出値Psmesとを
比較する (ステップ104)。この比較によって、Psref
smesの関係にあればインバータ装置2の出力周波数、
すなわち、圧縮機駆動電動機の運転周波数を上げ、反対
に、Psref<Psmesの関係になければインバータ装置2
の出力周波数、すなわち、圧縮機駆動電動機の運転周波
数を下げる (ステップ106)。
FIG. 4 shows an example of the processing procedure of the control circuit 3A. Here, the control circuit 3A turns on the electromagnetic switch 5 according to the operation command (step 101). Then, the inverter device 2 is controlled so that an alternating current having a predetermined frequency is applied to the compressor 1 (step 102). Therefore, when the compressor 1 is driven, the output value of the pressure sensor 4, that is, the pressure on the suction side of the compressor is read (step 103). Subsequently, the set value P sref for the suction side pressure P s and the detected value P smes are compared (step 104). By this comparison, P sref <
If there is a relationship of P smes , the output frequency of the inverter device 2,
That is, the operating frequency of the compressor drive motor is increased, and conversely, if the relation of P sref <P smes is not satisfied, the inverter device 2
Output frequency, that is, the operating frequency of the compressor drive motor is reduced (step 106).

【0004】この結果、冷凍負荷状態に応じて、圧縮機
1を能力制御運転することができる。
As a result, the compressor 1 can be operated in capacity control according to the refrigerating load condition.

【0005】[0005]

【発明が解決しようとする課題】上述した従来の冷凍機
の制御装置は、圧縮機1の吸込み側の圧力を設定値に近
付けるようにインバータ装置2の出力周波数を変化させ
る。従って、インバータ装置2が能力不足でもない限
り、圧力センサ4による圧力検出値も変化する。
The above-mentioned conventional refrigerator control device changes the output frequency of the inverter device 2 so that the pressure on the suction side of the compressor 1 approaches a set value. Therefore, the pressure detection value by the pressure sensor 4 also changes unless the capacity of the inverter device 2 is insufficient.

【0006】しかるに、従来の冷凍機の制御装置には圧
力センサ4の故障によつて圧力検出値が長時間に亘って
変化しない場合の対策が講じられていなかった。
However, the conventional control device for a refrigerator does not take measures against the case where the pressure detection value does not change for a long time due to the failure of the pressure sensor 4.

【0007】このため、圧力センサ4の故障により出力
が大きい状態に維持されると、圧縮機の運転周波数も大
きい値に固定され、過熱によって圧縮機が損壊すること
があった。また、冷凍能力過多により頻繁に断続運転さ
れるため油切れの原因になることもあった。
For this reason, if the output is maintained at a high level due to the failure of the pressure sensor 4, the operating frequency of the compressor is also fixed at a high value, and the compressor may be damaged by overheating. In addition, because the refrigerating capacity is too high, frequent intermittent operation may cause oil shortage.

【0008】また、圧力センサ4の故障により出力が小
さい状態に維持されると、圧縮機の出力周波数も小さい
値に固定されると共に、圧縮機が低速で連続運転される
が、このとき、冷凍負荷が大きいと冷凍能力不足となっ
て庫内温度が上昇することがあった。
When the output is kept small due to the failure of the pressure sensor 4, the output frequency of the compressor is fixed to a small value and the compressor is continuously operated at a low speed. If the load is large, the refrigerating capacity may be insufficient and the internal temperature may rise.

【0009】この発明は、上記の問題点を解決するため
になされたもので、圧力センサの故障によって圧力検出
値が長時間に亘って変化しない場合でも、圧縮機の保護
および冷凍能力の確保が可能な冷凍機の制御装置を得る
ことを目的とする。
The present invention has been made to solve the above problems, and protects the compressor and secures the refrigerating capacity even when the pressure detection value does not change for a long time due to a failure of the pressure sensor. The purpose is to obtain a possible refrigerator controller.

【0010】[0010]

【課題を解決するための手段】本発明は、商用電源また
は自家発電源の交流を、可変周波数の交流に変換して圧
縮機を駆動するインバータ装置と、前記圧縮機の吸込み
側の冷媒圧力を検出する圧力センサとを含み、この圧力
センサの出力に応じて前記インバータ装置の出力周波数
を制御する冷凍機の制御装置において、設定時間内に前
記圧力センサの出力が変化しないとき、前記インバータ
装置を切離し、前記圧縮機を前記商用電源または自家発
電源に直接接続する切替接続手段を備えたものである。
According to the present invention, an inverter device for converting an alternating current of a commercial power source or a self-generated power source into a variable frequency alternating current to drive a compressor, and a refrigerant pressure on a suction side of the compressor are provided. Including the pressure sensor for detecting, in the controller of the refrigerator that controls the output frequency of the inverter device according to the output of the pressure sensor, when the output of the pressure sensor does not change within a set time, the inverter device is It is provided with a switching connection means for disconnecting and directly connecting the compressor to the commercial power source or a private power source.

【0011】[0011]

【作用】この発明においては、設定時間内に圧力センサ
の出力が1回も変化しないとき、インバータ装置を切離
し、圧縮機を商用電源または自家発電源に直接接続する
ので、圧縮機の高速回転による過熱、断続運転による油
切れを未然に防止し、また、圧縮機の低速運転による冷
凍能力不足も解消することができる。
In the present invention, when the output of the pressure sensor does not change even once within the set time, the inverter device is disconnected and the compressor is directly connected to the commercial power source or the private power source. It is possible to prevent oil shortage due to overheating and intermittent operation, and it is also possible to eliminate insufficient refrigeration capacity due to low speed operation of the compressor.

【0012】[0012]

【実施例】以下、この発明を図面に示す実施例について
詳細に説明する。図1はこの発明の一実施例の概略構成
図であり、図中、図3と同一の符号を付したものはそれ
ぞれ同一の要素を示す。そして、インバータ装置2と圧
縮機1との間に電磁開閉器6を設けたこと、商用の三相
交流電源に接続された電源線R,S,Tを直接圧縮機1
に接続する電磁開閉器7を設けたこと、ならびに、これ
らの電磁開閉器を制御回路3で開閉制御するようにした
ことが図3と構成を異にしている。
Embodiments of the present invention will be described in detail below with reference to the drawings. FIG. 1 is a schematic configuration diagram of an embodiment of the present invention. In the figure, the same reference numerals as those in FIG. 3 denote the same elements. Further, the electromagnetic switch 6 is provided between the inverter device 2 and the compressor 1, and the power source lines R, S, T connected to the commercial three-phase AC power source are directly connected to the compressor 1.
The configuration is different from that of FIG. 3 in that the electromagnetic switch 7 connected to is provided and that the control circuit 3 controls the opening and closing of these electromagnetic switches.

【0013】この実施例は、運転指令に応じて制御回路
3が電磁開閉器5,6の両方を閉路させ、かつ、圧力セ
ンサ4の出力に応じてインバータ装置2の出力周波数を
制御する一方、圧力センサ4の出力が一定時間内に1回
も変化しないときに電磁開閉器5,6の両方を開路させ
てインバータ装置2を切り離し、その代わりに電磁開閉
器7を閉路させて圧縮機1を商用電源に直接接続して応
急運転しようとするものである。
In this embodiment, the control circuit 3 closes both of the electromagnetic switches 5 and 6 in accordance with the operation command, and controls the output frequency of the inverter device 2 in accordance with the output of the pressure sensor 4, while When the output of the pressure sensor 4 does not change even once within a fixed time, both the electromagnetic switches 5 and 6 are opened to disconnect the inverter device 2, and instead the electromagnetic switch 7 is closed to close the compressor 1. It intends to make an emergency operation by directly connecting to a commercial power source.

【0014】以下、この実施例の詳しい動作を、制御回
路3の処理手順を示す図2のフローチャートに従って説
明する。先ず、運転指令に応じて電磁開閉器5および6
の両方を閉路させる (ステップ201)。続いて、所定の周
波数の交流が圧縮機1に加わるようにインバータ装置2
を制御する (ステップ202)。
The detailed operation of this embodiment will be described below with reference to the flowchart of FIG. 2 showing the processing procedure of the control circuit 3. First, according to the operation command, the electromagnetic switches 5 and 6
Both are closed (step 201). Then, the inverter device 2 is operated so that an alternating current having a predetermined frequency is applied to the compressor 1.
Control (step 202).

【0015】次に、圧縮機1が駆動されると、圧力セン
サ4の出力値が変化しない時間を計時するためのタイム
カウンタをセットし (ステップ203)、さらに、圧力セン
サ4の出力値、すなわち、圧縮機の吸込み側の圧力を読
取る (ステップ204)。
Next, when the compressor 1 is driven, a time counter for setting the time when the output value of the pressure sensor 4 does not change is set (step 203), and the output value of the pressure sensor 4, that is, Read the pressure on the suction side of the compressor (step 204).

【0016】次に、吸込み側圧力Ps に対する設定値P
srefと検出値Psmesとを比較する (ステップ205)。これ
らの間に、Psref<Psmesの関係があればインバータ装
置2の出力周波数、すなわち、圧縮機駆動電動機の運転
周波数を上げ (ステップ206)、反対に、Psref<Psmes
の関係になければインバータ装置2の出力周波数、すな
わち、圧縮機駆動電動機の運転周波数を下げる (ステッ
プ207)。
Next, the set value P for the suction side pressure P s
The sref and the detected value P smes are compared (step 205). If there is a relation of P sref <P smes between them, the output frequency of the inverter device 2, that is, the operating frequency of the compressor drive motor is increased (step 206), and conversely, P sref <P smes
If not, the output frequency of the inverter device 2, that is, the operating frequency of the compressor drive motor is lowered (step 207).

【0017】次に、タイムカウンタがタイムアップした
か否かにより、設定時間Tが経過したか否かを判定し、
設定時間を経過するまで上記の処理を繰返す。
Next, it is determined whether or not the set time T has elapsed, depending on whether or not the time counter has timed up,
The above processing is repeated until the set time has elapsed.

【0018】次に、タイムカウンタがタイムアップした
とき、設定時間T内に圧力センサの出力値が変化したか
否かを判定し (ステップ209)、変化しておればタイムカ
ウンタをリセットして最初の処理に移り (ステップ21
0)、変化していなければ商用電源に切替運転する (ステ
ップ211)。ここで、商用電源への切替運転とは、電磁開
閉器5,6の両方を開路させてインバータ装置2を切り
離し、その代わりに電磁開閉器7を閉路させて圧縮機1
を商用電源に直接接続することを意味する。
Next, when the time counter has timed out, it is judged whether or not the output value of the pressure sensor has changed within the set time T (step 209). (Step 21
0) If not changed, the operation is switched to the commercial power source (step 211). Here, the switching operation to the commercial power source means that both the electromagnetic switches 5 and 6 are opened to disconnect the inverter device 2, and instead the electromagnetic switch 7 is closed to close the compressor 1
Means connecting directly to a commercial power source.

【0019】かくして、この実施例によれば、圧力セン
サの故障により設定時間内にその出力が1回も変化しな
いとき、インバータ装置を切離し、圧縮機を商用電源に
直接接続するので、圧縮機の過熱、油切れを未然に防止
し、また、冷凍能力不足も解消することができる。
Thus, according to this embodiment, when the output of the pressure sensor does not change even once within the set time due to the failure of the pressure sensor, the inverter device is disconnected and the compressor is directly connected to the commercial power source. It is possible to prevent overheating and oil shortage, and to solve the problem of insufficient refrigeration capacity.

【0020】なお、上記実施例では、商用電源から電力
を得る場合について説明したが、自家発電源から電力を
得る冷凍装置にも本発明を適用できることは言うまでも
ない。
In the above embodiments, the case where the electric power is obtained from the commercial power source has been described, but it goes without saying that the present invention can be applied to a refrigerating apparatus which obtains the electric power from a private power source.

【0021】[0021]

【発明の効果】以上の説明によって明らかなように、こ
の発明によれば、圧力センサの故障により、圧力センサ
の出力が設定時間内に何の変化も認められなかったと
き、インバータ装置を切離し、圧縮機を商用電源または
自家発電源に直接接続するので、圧縮機の高速回転によ
る過熱、断続運転による油切れを未然に防止し、また、
圧縮機の低速運転による冷凍能力不足も解消することず
ができる。
As is apparent from the above description, according to the present invention, when no change in the output of the pressure sensor is observed within the set time due to the failure of the pressure sensor, the inverter device is disconnected, Since the compressor is directly connected to a commercial power source or a private power source, overheating due to high speed rotation of the compressor and oil shortage due to intermittent operation are prevented in advance.
The lack of refrigeration capacity due to the low speed operation of the compressor can be solved.

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

【図1】本発明の一実施例の概略構成図。FIG. 1 is a schematic configuration diagram of an embodiment of the present invention.

【図2】本発明の一実施例の主要素の動作を説明するた
めのフローチャート。
FIG. 2 is a flowchart for explaining the operation of the main elements of the embodiment of the present invention.

【図3】従来の冷凍機の制御装置の概略構成図。FIG. 3 is a schematic configuration diagram of a conventional refrigerator control device.

【図4】従来の冷凍機の制御装置の主要素の動作を説明
するためのフローチャート。
FIG. 4 is a flowchart for explaining the operation of the main elements of a conventional refrigerator control device.

【符号の説明】[Explanation of symbols]

1 圧縮機 2 電力変換装置 3 制御回路 4 圧力センサ 5,6,7 電磁開閉器 1 Compressor 2 Electric power converter 3 Control circuit 4 Pressure sensor 5, 6, 7 Electromagnetic switch

Claims (1)

【特許請求の範囲】 【請求項1】商用電源または自家発電源の交流を、可変
周波数の交流に変換して圧縮機を駆動する電力変換装置
と、前記圧縮機の吸込み側の冷媒圧力を検出する圧力セ
ンサとを含み、この圧力センサの出力に応じて前記電力
変換装置の出力周波数を制御する冷凍機の制御装置にお
いて、設定時間内に前記圧力センサの出力変化がないと
き、前記電力変換装置を切離し、前記圧縮機を前記商用
電源または自家発電源に直接接続する切替接続手段を備
えたことを特徴とする冷凍機の制御装置。
Claim: What is claimed is: 1. A power converter for converting an alternating current of a commercial power supply or a self-generated power supply into a variable frequency alternating current to drive a compressor, and a refrigerant pressure on a suction side of the compressor. In a controller of a refrigerator that controls the output frequency of the power converter according to the output of the pressure sensor, when the output of the pressure sensor does not change within a set time, the power converter And a switching connection means for directly connecting the compressor to the commercial power source or a privately-generated power source.
JP3170185A 1991-07-10 1991-07-10 Controller of refrigerator Pending JPH0518617A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP3170185A JPH0518617A (en) 1991-07-10 1991-07-10 Controller of refrigerator

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP3170185A JPH0518617A (en) 1991-07-10 1991-07-10 Controller of refrigerator

Publications (1)

Publication Number Publication Date
JPH0518617A true JPH0518617A (en) 1993-01-26

Family

ID=15900265

Family Applications (1)

Application Number Title Priority Date Filing Date
JP3170185A Pending JPH0518617A (en) 1991-07-10 1991-07-10 Controller of refrigerator

Country Status (1)

Country Link
JP (1) JPH0518617A (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2006329574A (en) * 2005-05-30 2006-12-07 Ratsuku Rand:Kk Operation control system for refrigerating device
JP2014508274A (en) * 2011-03-04 2014-04-03 ブルックス オートメーション インコーポレイテッド Helium management control system
WO2019187526A1 (en) * 2018-03-28 2019-10-03 三菱重工サーマルシステムズ株式会社 Control device, compressor, electric compressor, belt-driven compressor, vehicle air conditioner, and control method

Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2006329574A (en) * 2005-05-30 2006-12-07 Ratsuku Rand:Kk Operation control system for refrigerating device
JP4693502B2 (en) * 2005-05-30 2011-06-01 株式会社ラックランド Operation control system for refrigeration equipment
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