JPH06323647A - Refrigerator - Google Patents

Abstract

PURPOSE:To provide a refrigerator capable of performing a stable operation even if a compressor of high pressure chamber type is installed. CONSTITUTION:A low pressure switch 10 is recovered, and before an operation of a comprestor 1 is started, a blower 8 for a condensor 2 is rotated in reference to a pressure difference between a high pressure side and a low pressure side of the compressor 1 and after the high pressure value is reduced, a bypassing pipe 5 for connecting the high pressure side and the low pressure side of the compressor 1 is opened for a specified period of time, the high pressure is released to the low pressure side, an energization load of the compressor 1 is reduced, thereafter an operation of the compressor 1 is started. With such an arrangement as above, it is possible to reduce flowing sound of the refrigerant gas generated when the bypassing pipe is opened in order to reduce the energization load of the high pressure chamber type compressor and further a capacity of an electrical motor for the compressor can be reduced to its minimum value.

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、高圧チャンバ方式の圧
縮機を備えた冷凍装置に係り、特に、安定した状態で稼
働せしめ得るように改良した冷凍機に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a refrigerating apparatus having a high-pressure chamber type compressor, and more particularly to a refrigerating apparatus improved so that it can be operated in a stable state.

【０００２】[0002]

【従来の技術】例えば、特開平1−210761 号公報に開示
されているように、高圧チャンバ方式の圧縮機を搭載し
た冷凍装置では、運転の安定化を図るために、圧縮機吐
出配管と、吸入配管とを、バイパス管を設け、吸入圧力
が、ある所定の圧力値以上となり、運転開始時に、圧縮
機チャンバ内の高圧ガスを、バイパス管により、低圧側
へ逃した後に、圧縮機を起動させる。2. Description of the Related Art For example, as disclosed in Japanese Unexamined Patent Publication No. 1-210761, a refrigeration system equipped with a high-pressure chamber type compressor has a compressor discharge pipe and a compressor discharge pipe in order to stabilize the operation. A bypass pipe is provided for the suction pipe and the suction pressure exceeds a certain predetermined pressure value, and at the start of operation, the high pressure gas in the compressor chamber is released to the low pressure side by the bypass pipe and then the compressor is started. Let

【０００３】[0003]

【発明が解決しようとする課題】ところが、従来技術
で、高圧チャンバ方式の圧縮機を搭載した冷凍装置を運
転制御した場合、以下に示す様な問題点が、発生する。However, in the prior art, when the refrigeration system equipped with the high-pressure chamber type compressor is operated and controlled, the following problems occur.

【０００４】例えば、高圧チャンバ方式の圧縮機を搭載
した冷凍装置が、運転中に、吸入圧力が所定の圧力値以
下となり、冷凍装置が、運転を停止し、その後、あまり
時間が経過しないうちに吸入圧力が、所定の圧力値以上
となり、運転を行う場合を仮定する。For example, while the refrigerating apparatus equipped with a high-pressure chamber type compressor is in operation, the suction pressure becomes equal to or lower than a predetermined pressure value, the refrigerating apparatus stops its operation, and then, after a short time has passed, It is assumed that the suction pressure exceeds a predetermined pressure value and the operation is performed.

【０００５】この場合、冷凍装置の運転条件により、多
少異なる場合も有るが、一般的に、冷凍装置が一旦停止
し、その後、すぐに、運転を行う場合には、圧縮機の高
圧側と低圧側との圧力差は、非常に大きくなる。In this case, although there may be some differences depending on the operating conditions of the refrigeration system, in general, when the refrigeration system is temporarily stopped and then immediately operated, the high pressure side and the low pressure side of the compressor are reduced. The pressure difference with the side becomes very large.

【０００６】このような状態の時に、従来技術で示され
ているように、圧縮機の高圧側と低圧側とを接続したバ
イパス管で、高圧ガスを、低圧側へ逃がした場合、圧力
差が非常に大きいため、バイパス管中を高圧ガスが流れ
る時、非常に大きな、冷媒ガス流動音が発生するという
問題点が生じた。In such a state, as shown in the prior art, when the high pressure gas is released to the low pressure side by the bypass pipe connecting the high pressure side and the low pressure side of the compressor, the pressure difference becomes large. Since it is so large, when the high-pressure gas flows through the bypass pipe, a very loud refrigerant gas flow noise is generated.

【０００７】本発明の目的は、高圧チャンバ方式の圧縮
機を搭載した冷凍装置を用いた場合にも、安定した運転
制御が可能な冷凍装置を提供することにある。An object of the present invention is to provide a refrigeration system capable of stable operation control even when a refrigeration system equipped with a high-pressure chamber type compressor is used.

【０００８】[0008]

【課題を解決するための手段】上記目的を達成するた
め、本発明の冷凍装置には、圧縮機の高圧側と低圧側と
をバランスさせるためのバイパス管が設けられており、
また、吐出ガス圧力を検知して、空冷式凝縮器用送風機
の回転数制御を行うためのコントローラも、設けられて
いる。To achieve the above object, the refrigeration system of the present invention is provided with a bypass pipe for balancing the high pressure side and the low pressure side of the compressor.
A controller for detecting the discharge gas pressure and controlling the rotation speed of the air-cooled condenser blower is also provided.

【０００９】本発明の冷凍装置は、圧縮機の高圧側と低
圧側とをバランスさせるためのバイパス制御と、空冷式
凝縮器用送風機の回転数制御とを並用する。The refrigeration system of the present invention uses the bypass control for balancing the high pressure side and the low pressure side of the compressor and the rotation speed control of the air-cooling type condenser blower.

【００１０】[0010]

【作用】前記の手段を講じた冷凍装置では、冷凍装置
が、一旦、停止した後に、吸入圧力が、所定の圧力値以
上となり、運転を再開する時点での、圧縮機の高圧側と
低圧側の圧力値をコントローラに入力する。その圧力差
が、ある所定の値以上であれば、まず、ある一定の時間
凝縮器用送風機を、所定の回転数で回転し、圧縮機の高
圧側の圧力値を低下させる。そして、圧縮機の高圧側と
低圧側との圧力差を小さくさせた後に、圧縮機の高圧側
と低圧側とを接続しているバイパス管の途中に設置され
た電磁開閉弁を、一定時間、開き、圧縮機チャンバ内の
高圧ガス圧力を、バイパス管により、低圧側へ逃がした
後に圧縮機を起動させれば、バイパス管を開く時に発生
する冷媒ガスの流動音も低下し、起動も容易となり、圧
縮機電動機を、最小限の電力にすることが可能である。In the refrigerating apparatus having the above-mentioned means, the refrigerating apparatus temporarily stops, and then the suction pressure becomes equal to or higher than the predetermined pressure value, and the high pressure side and the low pressure side of the compressor at the time of restarting the operation. Input the pressure value of to the controller. If the pressure difference is equal to or more than a predetermined value, first, the condenser blower is rotated at a predetermined rotation speed for a predetermined time to reduce the pressure value on the high pressure side of the compressor. Then, after reducing the pressure difference between the high pressure side and the low pressure side of the compressor, an electromagnetic opening / closing valve installed in the middle of the bypass pipe connecting the high pressure side and the low pressure side of the compressor for a certain period of time, If the high pressure gas pressure inside the compressor chamber is opened and the compressor is started after the high pressure gas pressure in the compressor chamber is released to the low pressure side by the bypass pipe, the flow noise of the refrigerant gas generated when the bypass pipe is opened is also reduced and the start becomes easier. It is possible to use the compressor motor with a minimum electric power.

【００１１】[0011]

【実施例】以下、本発明の一実施例を図１により説明す
る。DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to FIG.

【００１２】図１に示されているように、本発明の冷凍
サイクルは、圧縮機１，凝縮器２，膨張弁３，蒸発器４
の主要機器により形成されている。また、圧縮機１の高
圧側と、低圧側は、バイパス管５により接続されてお
り、バイパス管５の途中には、電磁開閉弁７が設置され
ている。そして、凝縮器２用の送風機８は、圧縮機１の
高圧側配管に接続された高圧圧力センサ１２で、検出さ
れた圧力値により、コントローラ９で回転数制御を行っ
ている。As shown in FIG. 1, the refrigeration cycle of the present invention comprises a compressor 1, a condenser 2, an expansion valve 3, and an evaporator 4.
It is formed by the main equipment of. The high pressure side and the low pressure side of the compressor 1 are connected by a bypass pipe 5, and an electromagnetic opening / closing valve 7 is installed in the middle of the bypass pipe 5. The blower 8 for the condenser 2 has the high-pressure pressure sensor 12 connected to the high-pressure side pipe of the compressor 1, and the controller 9 controls the rotation speed based on the detected pressure value.

【００１３】本発明の冷凍装置は、蒸発器４側の負荷に
応じて、電磁開閉弁６を開閉することにより、運転，停
止制御を行っている。The refrigerating apparatus of the present invention controls the operation and stop by opening and closing the electromagnetic opening / closing valve 6 according to the load on the evaporator 4 side.

【００１４】蒸発器４の負荷が低下し、電磁開閉弁６が
閉じると、圧縮機１の吸入圧力が、低圧圧力スイッチ１
０により、あらかじめ設定された圧力値よりも低くなる
と、圧縮機１は、停止し、その後、蒸発器４の負荷が、
再び増加し電磁開閉弁６は開き、吸入圧力が徐々に高く
なり、低圧圧力スイッチ１０の設定値以上となると、圧
縮機１は、運転を開始する。When the load of the evaporator 4 is reduced and the electromagnetic on-off valve 6 is closed, the suction pressure of the compressor 1 is changed to the low pressure switch 1
When the pressure becomes lower than the preset pressure value by 0, the compressor 1 is stopped, and then the load of the evaporator 4 becomes
When the solenoid valve 6 increases again and the intake pressure gradually rises and becomes equal to or higher than the set value of the low pressure switch 10, the compressor 1 starts operating.

【００１５】本発明の冷凍装置は、高圧チャンバ方式の
圧縮機１を搭載しているため、高いバランス圧力の状態
から始動させた時には、容積比に応じて、吐出圧力が著
しく上昇し、圧縮機１の電動機出力を、大幅に大きくし
ないと始動できず、又、圧縮機構の機械的強度も、増し
ておかなくてはならない。Since the refrigerating apparatus of the present invention is equipped with the high pressure chamber type compressor 1, when it is started from the state of high balance pressure, the discharge pressure remarkably rises according to the volume ratio, and the compressor is increased. The motor output of No. 1 cannot be started unless the output of the motor is significantly increased, and the mechanical strength of the compression mechanism must be increased.

【００１６】そこで、低圧圧力スイッチ１０が復帰し、
圧縮機１の運転を開始する前に、高圧圧力センサ１２と
低圧圧力センサ１１とにより検出され、コントローラ９
へ入力された高圧圧力値と低圧圧力値との圧力差が、設
定値よりも小さい場合には、凝縮器２用送風機８を一定
時間、あらかじめ設定されている回転数で回転させ、圧
縮機１の高圧側の圧力値を低下させた後に、圧縮機１を
運転させている。Then, the low pressure switch 10 is restored,
Before the operation of the compressor 1 is started, it is detected by the high pressure sensor 12 and the low pressure sensor 11 that the controller 9
When the pressure difference between the high-pressure pressure value and the low-pressure pressure value input to the compressor is smaller than the set value, the blower 8 for the condenser 2 is rotated for a certain period of time at a preset number of rotations, and the compressor 1 The compressor 1 is operated after the pressure value on the high pressure side is decreased.

【００１７】また、コントローラ９へ入力された高圧圧
力値と低圧圧力値との圧力差が、設定値よりも大きい場
合には、凝縮器２用の送風機８を、圧力差が設定値より
も小さい場合と同様に一定時間回転させ、圧縮機１の高
圧側の圧力値を低下させ、さらに、その後、一定時間、
圧縮機１の高圧側と低圧側とを接続しているバイパス管
５の途中に設置されている電磁開閉弁７を閉じ、圧縮機
１の高圧側の圧力を低圧側へ逃がし、一定時間経過後、
圧縮機１を運転させている。If the pressure difference between the high pressure pressure value and the low pressure pressure value input to the controller 9 is larger than the set value, the blower 8 for the condenser 2 is set to have the pressure difference smaller than the set value. In the same manner as in the case, the pressure value on the high pressure side of the compressor 1 is reduced by rotating for a certain period of time, and thereafter, for a certain period of time,
After closing the electromagnetic on-off valve 7 installed in the middle of the bypass pipe 5 that connects the high pressure side and the low pressure side of the compressor 1, the pressure on the high pressure side of the compressor 1 is released to the low pressure side, and after a certain period of time elapses. ,
The compressor 1 is operating.

【００１８】本実施例によれば、高圧チャンバ方式の圧
縮機を搭載した冷凍装置の場合、低圧圧力運転制御を実
施する場合、確実に運転制御が可能となり、圧縮機電動
機も、必要最小限に出力を小さくでき、また、圧縮機に
無理な作用が働かず、安定した運転が可能となる。According to the present embodiment, in the case of the refrigerating apparatus equipped with the high-pressure chamber type compressor, when the low-pressure operation control is carried out, the operation control can be surely performed, and the compressor motor can be minimized. The output can be reduced, and the compressor can be operated in a stable manner without any unreasonable effects.

【００１９】[0019]

【発明の効果】本発明によれば、高圧チャンバ方式の圧
縮機を搭載した冷凍装置の運転制御を安定して行え、バ
イパス管開路時に発生する冷媒ガスの流動音を低減する
ことが可能である。According to the present invention, it is possible to stably control the operation of a refrigeration system equipped with a high-pressure chamber type compressor, and reduce the flow noise of the refrigerant gas generated when the bypass pipe is opened. .

【００２０】更に、圧縮機用電動機の容量を必要最小限
にまで、低減でき圧縮機構成部材の所要強度を低減する
ことができる。Further, the capacity of the compressor electric motor can be reduced to the necessary minimum, and the required strength of the compressor constituent members can be reduced.

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

【図１】本発明の冷凍装置の基本冷凍サイクルの系統
図。FIG. 1 is a system diagram of a basic refrigeration cycle of a refrigeration system of the present invention.

【符号の説明】[Explanation of symbols]

１…圧縮機、２…凝縮器、３…膨張弁、４…蒸発器、５
…バイパス管、６，７…電磁開閉弁、８…凝縮器用送風
機、９…コントローラ、１０…低圧圧力スイッチ、１１
…低圧圧力センサ、１２…高圧圧力センサ。1 ... Compressor, 2 ... Condenser, 3 ... Expansion valve, 4 ... Evaporator, 5
... Bypass pipes, 6, 7 ... Electromagnetic on-off valve, 8 ... Condenser blower, 9 ... Controller, 10 ... Low pressure switch, 11
... low pressure sensor, 12 ... high pressure sensor.

Claims (1)

【特許請求の範囲】[Claims] 【請求項１】冷媒の圧縮機と，凝縮器と，膨張弁と，蒸
発器とを含む冷凍サイクルにおいて、 前記圧縮機は、圧縮された冷媒ガスをチャンバ内に放出
する構造であり、前記凝縮器は、空気冷却方式により、
前記冷媒ガスを凝縮し、前記冷媒ガスの吸入圧力を検知
する手段を有し、前記吸入圧力検出手段によって検出さ
れた吸入圧力が、所定の値未満であれば、前記圧縮機
を、運転する自動制御手段を設けたことを特徴とする冷
凍装置。1. A refrigeration cycle including a refrigerant compressor, a condenser, an expansion valve, and an evaporator, wherein the compressor has a structure for releasing compressed refrigerant gas into a chamber, The equipment is air cooled
If the suction pressure detected by the suction pressure detection means is less than a predetermined value, the compressor automatically operates to drive the compressor. A refrigeration apparatus provided with a control means.