JPH0415453A - Freezer device - Google Patents

Abstract

PURPOSE:To eliminate a bypassing pipe for releasing a high pressure before energizing a compressor to a lower pressure side and reduce a sound of flow in a bypassing operation by a method wherein an air blower for a condensor is rotated before energizing the compressor in order to decrease a high pressure. CONSTITUTION:Operation and stopping of a compressor are carried out by sensing a low pressure with a low pressure switch 7 in response to a load at an evaporation device. The low pressure switch 7 is returned back to its original position, an air blower 3 for a condensor 2 is rotated together with an operating signal so as to decrease a high pressure. The air blower is rotated, a time limiting relay 7' is electrically energized and a compressor 1-a (1-a') is operated after a specified period of time elapses. In addition, the high pressure is detected by a pressure opening or closing device 8 and if this detected pressure is lower than the set pressure, the air blower 3 is not rotated and the compressor 1-a (1-a') is operated.

Description

【発明の詳細な説明】 ［産業上の利用分野〕 本発明は、バルブ機構のない容積形の圧縮機を用いた冷
凍サイクル及び冷凍装置の運転制御に関する。DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to the operation control of a refrigeration cycle and a refrigeration system using a positive displacement compressor without a valve mechanism.

〔従来の技術〕[Conventional technology]

ショーケースなどと接続する冷凍装置は、吸入圧力によ
り圧縮機の運転制御を実施しており、従来の装置は、特
願昭６３−３５０９２号明細書に記載のように制御して
いるが、その冷凍サイクルを第３図に示し、運転制御回
路の一部を第４図に示す。In a refrigeration system connected to a showcase or the like, the operation of the compressor is controlled by suction pressure, and the conventional system is controlled as described in Japanese Patent Application No. 63-35092. The refrigeration cycle is shown in FIG. 3, and part of the operation control circuit is shown in FIG. 4.

第３図、第４図を用いて説明する。バルブ機構のない容
積形の圧縮機の場合には、高いバランス圧力より始動さ
せた場合は、容積比に応して吐出圧力は著しく」二昇し
、圧縮機１−ｂ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
てはならないので、圧縮機チャンバ内の圧力をＳ側逆止
弁１３より低圧側に逃すバイパス管１０．その時に圧縮
機への逆流防止用に逆止弁］２を取付け、バイパス管１
０の途中にバイパス電磁弁１１を取付けている。低圧ス
イッチ７が復帰し運転信号と共にバイパス電磁弁１−１
を開路させ、圧縮機チャンバ内の圧力を低圧側に逃がし
ている。バイパス電磁弁１１の開路と共に限時継電器９
′に通電させ、定時間経過後に圧縮機１−ａ（１−ａ’
）を運転させている。This will be explained using FIGS. 3 and 4. In the case of a positive displacement compressor without a valve mechanism, if it is started from a high balance pressure, the discharge pressure will rise significantly depending on the volume ratio, and the motor output of compressor 1-b will be significantly increased. Since it cannot be started unless the size is increased, and the mechanical strength of the compression mechanism must also be increased, a bypass pipe 10 is provided to release the pressure inside the compressor chamber to the lower pressure side than the S side check valve 13. At that time, install a check valve] 2 to prevent backflow to the compressor, and install a bypass pipe 1.
A bypass solenoid valve 11 is installed in the middle of 0. The low pressure switch 7 returns and the bypass solenoid valve 1-1 is activated with the operation signal.
The circuit is opened and the pressure inside the compressor chamber is released to the low pressure side. When the bypass solenoid valve 11 opens, the time-limited relay 9
', and after a certain period of time, the compressor 1-a (1-a'
) is being driven.

〔発明が解決しようとする課題〕[Problem to be solved by the invention]

圧縮機が高圧チャンバ方式の場合、従来は運転時に圧縮
機チャンバ内の高圧を低圧側に逃がすために、バイパス
管、バイパス電磁弁、逆止弁を取付けてあり、さらに、
圧力をバイパスするときの流動音については考慮されて
おらず、流動音が大きくて問題となっていた。Conventionally, when the compressor is of the high pressure chamber type, a bypass pipe, bypass solenoid valve, and check valve are installed in order to release the high pressure in the compressor chamber to the low pressure side during operation.
No consideration was given to flow noise when bypassing pressure, and the flow noise was loud and posed a problem.

本発明の目的は、バイパス管、バイパス電磁弁逆止弁の
取付けをやめ、流動音をなくし、冷凍装置の運転制御を
安定的に実施する場合の基本的な冷凍サイクル、及び、
運転制御装置を提供することにある。The object of the present invention is to provide a basic refrigeration cycle in which the installation of bypass pipes, bypass solenoid valves and check valves are eliminated, flow noise is eliminated, and the operation control of a refrigeration system is stably implemented;
The purpose of the present invention is to provide an operation control device.

〔課題を解決するための手段〕[Means to solve the problem]

上記目的を達成するために本発明は高圧圧力を下げるの
に圧縮機の起動前に凝縮機の送風機を回すことを特徴と
する。To achieve the above object, the present invention is characterized in that the blower of the condenser is turned on before starting the compressor in order to lower the high pressure.

〔作用〕[Effect]

圧縮機の起動前に送風機を運転することにより、周囲空
気との熱交換で、はぼ、周囲空気温度の飽和圧力まで低
下し起動負荷が軽減され起動が容易となる。By operating the blower before starting the compressor, heat exchange with the surrounding air causes the pressure to drop to the saturation pressure of the surrounding air temperature, reducing the starting load and making starting easier.

また、この送風機の運転時に高圧圧力値により作動する
圧力開閉器の条件を入れることで、圧縮機の起動が可能
な圧力以下の時には送風機を事前に運転しないような回
路を構成することで、不必要な事前送風運転をも行なわ
ないようにすることもできる。In addition, by including a condition for the pressure switch to be activated by a high pressure value when operating this blower, we can configure a circuit that prevents the blower from operating when the pressure is below the pressure that can start the compressor. It is also possible to not perform the necessary pre-air blowing operation.

〔実施例〕〔Example〕

以下、本発明の一実施例を第１図、第２図により説明す
る。圧縮機上−ａ、凝縮器２．受液器４゜蒸発器５．ア
キュームレータ６、の主要機器で冷凍サイクルが形成さ
れている。前述のように圧縮機の運転、停止は、蒸発器
側の負荷に応じて、低圧圧力を低圧スイッチ７で検知し
て行なっている。An embodiment of the present invention will be described below with reference to FIGS. 1 and 2. Compressor top-a, condenser 2. Receiver 4° Evaporator 5. A refrigeration cycle is formed by the main equipment of the accumulator 6. As mentioned above, the compressor is operated and stopped by detecting the low pressure with the low pressure switch 7, depending on the load on the evaporator side.

バルブ機構のない容積形で圧縮機の場合には、高いバラ
ンス圧力より始動させた場合は、容積比に応じて吐出圧
力は著しく上昇し、圧縮機１．−　ａの電動機出力を大
幅に太きくしないと始動できず圧縮機構の機械的強度も
増しておかなくてはならない。In the case of a positive displacement compressor without a valve mechanism, if the compressor is started from a high balance pressure, the discharge pressure will increase significantly depending on the volume ratio, and the compressor 1. - The motor cannot be started unless the motor output of a is greatly increased, and the mechanical strength of the compression mechanism must also be increased.

低圧スイッチ７が達帰し、運転信号と共に凝縮器２の送
風機３を回し、高圧側の圧力を下げる。When the low pressure switch 7 returns, the blower 3 of the condenser 2 is turned along with the operation signal to lower the pressure on the high pressure side.

送風機を回すと共に限時継電器７′に通電させ、一定時
間経過後に、圧縮機１−ａ（１−ａ’）を運転させてい
る。While turning the blower, the time-limited relay 7' is energized, and after a certain period of time has elapsed, the compressor 1-a (1-a') is operated.

さらに、圧力開閉器８により高圧側の圧力を検知し設定
圧力以下の場合には、送風機３を回さずに圧縮機１−ａ
（１−ａ’）を運転させている。Furthermore, when the pressure on the high pressure side is detected by the pressure switch 8 and is lower than the set pressure, the compressor 1-a is operated without turning the blower 3.
(1-a') is being operated.

本実施例によれば確実に運転制御が可能となり、圧縮機
起動前の高圧を低圧側に逃すバイパス管が不要でバイパ
ス時の流動音をなくすことができる。According to this embodiment, reliable operation control is possible, a bypass pipe for discharging high pressure before starting the compressor to the low pressure side is unnecessary, and flow noise during bypass can be eliminated.

〔発明の効果〕〔Effect of the invention〕

本発明によれば、バルブ機構のない容積形の圧縮機の場
合、高圧側の圧力を低圧側にバイパスさせるためのバイ
パス管、バイパス電磁弁、逆止弁が不要となり、圧縮機
の起動前のバイパスの流動音をなくすことができる。According to the present invention, in the case of a positive displacement compressor without a valve mechanism, there is no need for a bypass pipe, a bypass solenoid valve, and a check valve to bypass the pressure on the high pressure side to the low pressure side, and the Bypass flow noise can be eliminated.

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

第１図は本発明の冷凍サイクルの一実施例のブロック図
、第２図は本発明の操作の一実施例の回路図、第３図は
従来技術の冷凍サイクルのブロック図、第４図は従来技
術の操作回路図である。 １−ａ、１−ｂ−圧縮機、２・凝縮器、３，３′・・送
風機、４・・受液器、５・・蒸発器、６・・・アキュー
ムレータ、７，７′・・・低圧スイッチ、８，８′圧力
開閉器、９′・・・限時継電器、１０・・・バイパス管
、１１．１１’・・・電磁弁、１２．１３・・・逆止弁
。FIG. 1 is a block diagram of an embodiment of the refrigeration cycle of the present invention, FIG. 2 is a circuit diagram of an embodiment of the operation of the present invention, FIG. 3 is a block diagram of a conventional refrigeration cycle, and FIG. 4 is a block diagram of an embodiment of the refrigeration cycle of the present invention. FIG. 2 is an operating circuit diagram of the prior art. 1-a, 1-b-compressor, 2. condenser, 3, 3'... blower, 4. liquid receiver, 5.. evaporator, 6... accumulator, 7, 7'... Low pressure switch, 8, 8' pressure switch, 9'... time limit relay, 10... bypass pipe, 11.11'... solenoid valve, 12.13... check valve.

Claims (1)

【特許請求の範囲】 １、圧縮機、凝縮器、膨張弁、蒸発器等の機器で冷凍サ
イクルを構成し、圧縮されたガスを、チャンバ内に放出
する圧縮機で、吸入圧力を検知し設定圧力以下の圧力で
、前記圧縮機を停止させ、設定圧力以上の圧力の場合に
、前記圧縮機を運転させる冷凍装置において、 運転停止後の吸入圧力が設定圧力に上昇した時に、圧縮
機の運転前に前記凝縮器の送風機を回すことを特徴とす
る冷凍装置。[Claims] 1. A refrigeration cycle is composed of equipment such as a compressor, a condenser, an expansion valve, an evaporator, etc., and the compressor releases compressed gas into a chamber, which detects and sets the suction pressure. In a refrigeration system that stops the compressor when the pressure is lower than the set pressure and operates the compressor when the pressure is higher than the set pressure, the compressor stops running when the suction pressure after the stop of operation rises to the set pressure. A refrigeration system characterized in that a blower of the condenser is turned on beforehand.