JPS60223963A - Refrigerator - Google Patents

Refrigerator

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Publication number
JPS60223963A
JPS60223963A JP8056684A JP8056684A JPS60223963A JP S60223963 A JPS60223963 A JP S60223963A JP 8056684 A JP8056684 A JP 8056684A JP 8056684 A JP8056684 A JP 8056684A JP S60223963 A JPS60223963 A JP S60223963A
Authority
JP
Japan
Prior art keywords
pressure
frequency
inverter
refrigerant
pressure detection
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
Application number
JP8056684A
Other languages
Japanese (ja)
Other versions
JPH0360027B2 (en
Inventor
和弘 上田
木村 誠夫
敏明 山口
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.)
Mitsubishi Electric Corp
Original Assignee
Mitsubishi Electric 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 Mitsubishi Electric Corp filed Critical Mitsubishi Electric Corp
Priority to JP8056684A priority Critical patent/JPS60223963A/en
Publication of JPS60223963A publication Critical patent/JPS60223963A/en
Publication of JPH0360027B2 publication Critical patent/JPH0360027B2/ja
Granted legal-status Critical Current

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  • Devices That Are Associated With Refrigeration Equipment (AREA)

Abstract

(57)【要約】本公報は電子出願前の出願データであるた
め要約のデータは記録されません。
(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

【発明の詳細な説明】 〔発明の技術分野〕 この発明は冷凍装置に関し、特にインバータを改良に関
するものである。
DETAILED DESCRIPTION OF THE INVENTION [Technical Field of the Invention] The present invention relates to a refrigeration system, and particularly relates to an improvement in an inverter.

〔従来技術〕[Prior art]

インバータを有する冷凍装置は、M源周波数を可変する
ことによって、冷媒圧縮機をu賃すする電動機の回転を
制御するものである。そして、このように圧縮機の回転
速度を制御することξこより、冷凍能力を連続的に変化
させ得るものである。
A refrigeration system having an inverter controls the rotation of an electric motor that drives a refrigerant compressor by varying the M source frequency. By controlling the rotational speed of the compressor in this way, the refrigerating capacity can be changed continuously.

第1図は従来から一般に用いられて0るインノ〈−夕を
有する冷凍装置の一例を示す樗成図であって、n)は冷
媒を圧縮する圧縮機、(2)は凝縮器、(3)は膨張弁
、(4)は蒸発器であり、これらは管路を介して閉ルー
プに接続されることにより冷凍サイクルを構成している
。(5)は商用電源の周波数を可変して出力するインバ
ータ、また、(6) )、t lEE縮機113の低圧
側の冷媒圧力を検出する圧力検出部(7)の出力信号に
応じてインバータ(5)を制御する制御部である。(8
)は」−記インバータ(6)と圧縮機(υを結ぶ電源ラ
インに設けた電磁接触器、(9)は同じ(上記電源ライ
ンに直列に設けた過電流網V器である。
FIG. 1 is a diagram showing an example of a conventionally commonly used refrigeration system having an in-line type, in which n) is a compressor that compresses the refrigerant, (2) is a condenser, and (3) is a compressor that compresses the refrigerant. ) is an expansion valve, and (4) is an evaporator, which constitute a refrigeration cycle by being connected in a closed loop via a pipe. (5) is an inverter that outputs a variable frequency of the commercial power supply; This is a control unit that controls (5). (8
) is an electromagnetic contactor provided on the power line connecting the inverter (6) and the compressor (υ), and (9) is the same (overcurrent network V device provided in series with the above power line).

−−−、−mj 、−1−x−mvty +mmthl
i (r セ々1)て、図示しない電源スィッチを投入
すると、電磁接触器(8)が閉じられてインバータ(5
)の出力される電力が圧縮機(1)の電動機(図示せず
)に供給され、圧縮機+1)は駆動される。圧縮機(1
)が動作することにより、圧縮冷媒が冷凍サイクルを流
れると、周知のように蒸発器(4)による冷却が行われ
る。
---, -mj, -1-x-mvty +mmthl
When the power switch (not shown) is turned on, the magnetic contactor (8) is closed and the inverter (5) is turned on.
) is supplied to the electric motor (not shown) of the compressor (1), and the compressor +1) is driven. Compressor (1
), when the compressed refrigerant flows through the refrigeration cycle, cooling is performed by the evaporator (4) as is well known.

ここで、冷却負荷が少なくなると、冷凍サイクルの低圧
側の冷媒圧力が下がり、これに伴って圧力検出器(7)
から制御部(6)に出力される圧力検出信号のレベルも
低下する′。制御部(6)では上記圧力検出信号を基孕
値と比較しているため、圧力検出信号が基準値よりも低
い場合には、制御部(6)はインバータ16)をこの出
力周波数が低下するように制御し、圧縮機11)の回転
数を下げることによって冷却能力を下げる。このように
して冷却能力が下げられると、冷凍サイクルの低圧側の
冷媒圧力が上昇し設定圧に収束する。
Here, when the cooling load decreases, the refrigerant pressure on the low pressure side of the refrigeration cycle decreases, and the pressure detector (7)
The level of the pressure detection signal output to the control unit (6) also decreases. Since the control unit (6) compares the pressure detection signal with the reference value, if the pressure detection signal is lower than the reference value, the control unit (6) controls the inverter 16) so that the output frequency decreases. The cooling capacity is lowered by lowering the rotation speed of the compressor 11). When the cooling capacity is lowered in this way, the refrigerant pressure on the low pressure side of the refrigeration cycle increases and converges to the set pressure.

また、冷却負荷が高い場合には、冷凍サイクルの低圧側
の冷媒圧力が上昇し、これに伴って圧力検出部(7)か
ら制御部(6)に出力される圧力検出信号が上昇する。
Further, when the cooling load is high, the refrigerant pressure on the low pressure side of the refrigeration cycle increases, and the pressure detection signal output from the pressure detection section (7) to the control section (6) increases accordingly.

この結果、制御部(6)はインバータ(5)をその出力
周波数が上昇するように制御し、圧縮機(1)の回転数
を上昇させることにより、冷却能力を増加させる。
As a result, the control unit (6) controls the inverter (5) to increase its output frequency, and increases the rotational speed of the compressor (1), thereby increasing the cooling capacity.

従って、このようなインバータ(5)を有する冷凍装置
においては、これを冷却負荷に応じた冷却能力に制御す
ることができ、省電力化が可能となる。
Therefore, in a refrigeration system having such an inverter (5), it is possible to control the cooling capacity according to the cooling load, and it is possible to save power.

しかしながら、上記従来の冷凍装置では、冷媒圧力が大
きく変動する場合、あるいは運転開始時および除霜後の
プルダウン時等の冷媒圧力が収束させようとする冷媒圧
力と比較して高い場合においては、インバータ(5)の
出力周波数の変化幅が一定であるため、目標冷媒圧力に
到達するまでの時間が長くかかり、被冷却物の温度が上
昇し、被冷却物の鮮度が保持されないという欠点があっ
た。
However, in the conventional refrigeration equipment described above, when the refrigerant pressure fluctuates greatly, or when the refrigerant pressure is higher than the refrigerant pressure to be converged, such as at the start of operation or during pulldown after defrosting, the inverter (5) Since the range of change in the output frequency is constant, it takes a long time to reach the target refrigerant pressure, which has the disadvantage that the temperature of the cooled object increases and the freshness of the cooled object is not maintained. .

〔発明の概要〕[Summary of the invention]

この発明は上記のような従来の問題を解決したもので、
低圧側冷媒圧力を検出し冷媒圧力を所定値に収束させる
とともに、上記圧力検出信号と収束させようとする冷媒
圧力との圧力差に応じて、インバータ出力周波数の変化
幅を制御することにより、圧力変動が大きい場合あるい
は運転開始時や除霜後のように冷却負荷が大きい場合に
おいても迅速に所定の圧力に到達でき、消費電力の低下
が図れるようにした冷凍装置を提供することを目的とす
る。
This invention solves the conventional problems as mentioned above.
By detecting the refrigerant pressure on the low pressure side and converging the refrigerant pressure to a predetermined value, and controlling the range of change in the inverter output frequency according to the pressure difference between the pressure detection signal and the refrigerant pressure to be converged, the pressure is The purpose of the present invention is to provide a refrigeration system that can quickly reach a predetermined pressure and reduce power consumption even when there are large fluctuations or when the cooling load is large, such as at the start of operation or after defrosting. .

〔発明の実施例〕[Embodiments of the invention]

第2図はこの発明による冷凍装置の一実施例を示す構成
図であって、第1図と同一部分は同一記号を用いて示し
である。同図においてtlQは、周波数設定部であり、
圧力検出部(7)より出力される圧力検出信号に応じて
低圧側の冷媒圧力が所定の設定値に収束するように、周
波数を設定するものである。aηは周波数変化幅設定部
であり、圧力検出部(7)より出力される圧力検出信号
と収束させようとする冷媒圧力との圧力差に応じて、イ
ンバータ出力周波数の変化幅を制御するものである。Q
eは、上記周波数設定部園と上記周波数変化幅設定部O
Qとにより、インバータ(5)に周波数出力信号を出力
すス田?I#訪出−hlFil畝弔本スすなわち、周波
数変化幅設定部aηにより、インバータ出力周波数の変
化幅を圧力検出部(7)より出力される圧力検出信号と
収束させようとする冷媒圧力との圧力差に応じて自由に
変化させることができる。たとえば、圧力検出部(7)
より出力される圧力検出信号と収束させようとする冷媒
圧力との圧力差が大きい場合には、インバータ出力周波
数を5H2ごと変化させ、圧力検出部(7)より出力さ
れる圧力検出信号と収束させようとする冷媒圧力との圧
力差が小さい場合には、インバータ出力周波数をzH2
ごとに変化させることができる。
FIG. 2 is a block diagram showing an embodiment of a refrigeration system according to the present invention, and the same parts as in FIG. 1 are indicated using the same symbols. In the figure, tlQ is a frequency setting section,
The frequency is set so that the refrigerant pressure on the low pressure side converges to a predetermined set value according to the pressure detection signal output from the pressure detection section (7). aη is a frequency change width setting unit, which controls the change width of the inverter output frequency according to the pressure difference between the pressure detection signal output from the pressure detection unit (7) and the refrigerant pressure to be converged. be. Q
e represents the frequency setting section O and the frequency change width setting section O.
Q outputs a frequency output signal to the inverter (5). I#Visit - hlFil's Condolences In other words, the frequency change width setting section aη sets the change width of the inverter output frequency to the pressure detection signal output from the pressure detection section (7) and the refrigerant pressure to be converged. It can be freely changed according to the pressure difference. For example, the pressure detection section (7)
If the pressure difference between the pressure detection signal output from the pressure detection section (7) and the refrigerant pressure to be converged is large, the inverter output frequency is changed every 5H2 to make it converge with the pressure detection signal output from the pressure detection section (7). When the pressure difference between the refrigerant pressure and the desired refrigerant pressure is small, the inverter output frequency is
It can be changed every time.

しかも、運転状態の冷媒圧力を常に検出し、収束させよ
うとする冷媒圧力と比較しているので、その圧力差に応
じて周波数変化幅が例えば5H2。
Moreover, since the refrigerant pressure in the operating state is constantly detected and compared with the refrigerant pressure to be converged, the frequency change range is, for example, 5H2 depending on the pressure difference.

4H2・・・tH2と変化し、冷媒圧力を収束させる。4H2...tH2 to converge the refrigerant pressure.

この収束するまでの間の検出冷媒圧力が収束させようと
する冷媒圧力以上に変化することがなく、迅速に所定の
圧力に到達する。所定の圧力に達した後は、到達したと
きの周波数で圧縮機(1)の運転を続行するへ 〔発明の効果〕 以上説明したように、この発明による冷凍装置は圧力検
出部より出力される圧力検出信号と収束させようとする
冷媒圧力を常に検出し、その圧力差に応じてインバータ
出力周波数の変化幅を決定しているので、圧力変動が大
きい場合あるいは運転開始時や除箱後のように冷却負荷
が大きい場合においても迅速に所定の圧力に到達でき、
消費電力の低下が図れるとともに被冷却物の温度が一定
となり鮮度が保持される。
The detected refrigerant pressure until convergence does not change more than the refrigerant pressure to be converged, and quickly reaches the predetermined pressure. After the predetermined pressure is reached, the compressor (1) continues to operate at the frequency at which the predetermined pressure was reached. [Effects of the Invention] As explained above, in the refrigeration system according to the present invention, the pressure is output from the pressure detection section. The refrigerant pressure that is to be converged with the pressure detection signal is constantly detected, and the range of change in the inverter output frequency is determined according to the pressure difference. Even when the cooling load is large, the predetermined pressure can be quickly reached.
In addition to reducing power consumption, the temperature of the object to be cooled remains constant and freshness is maintained.

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

第1図は従来の冷凍装置を示す構成図、第2図はこの発
明による冷凍装置の一実施例を示す構成図である。 (1)・・・圧縮機、(2)・・・凝縮器、(3)・・
・膨張弁、(4)・・・蒸発器、(5)・・・インバー
タ、(6)・・・制御部、(7)・・・圧力検出部、0
0・・・周波数設定部、qυ・・・周波数変化幅設定1
 部、(2)・・・周波数出力回路。 なお、図中同一符号は同一または相当部分を示す。 第1図 第2図
FIG. 1 is a block diagram showing a conventional refrigeration system, and FIG. 2 is a block diagram showing an embodiment of the refrigeration system according to the present invention. (1)...Compressor, (2)...Condenser, (3)...
・Expansion valve, (4)...evaporator, (5)...inverter, (6)...control unit, (7)...pressure detection unit, 0
0...Frequency setting section, qυ...Frequency change width setting 1
Section (2)...Frequency output circuit. Note that the same reference numerals in the figures indicate the same or corresponding parts. Figure 1 Figure 2

Claims (1)

【特許請求の範囲】[Claims] 圧縮機1M縮器、膨張弁及び蒸発器が閉ループlこ接続
されることによって構成された冷凍サイクルと、電標周
波数を可変して圧縮機を駆動する電動機に供給するイン
バータと、上記冷凍サイクルの低圧側における冷媒圧力
を検出して圧力検出信号を発生する圧力検出部と、上記
圧力検出信号に応じて低圧側の冷媒圧力を所定の設定値
に収束するようにインバータ周波数を設定する周波数設
定部と、上記圧力検出信号と収束させようとする冷媒圧
力との圧力差に応じて、インバータ出力周波数の変化幅
を制御する周波数変化幅設定部とを備えたことを特徴と
する冷凍装置。
A refrigeration cycle configured by connecting a 1M compressor, an expansion valve, and an evaporator in a closed loop, an inverter that varies the electric frequency and supplies it to an electric motor that drives the compressor; A pressure detection section that detects the refrigerant pressure on the low pressure side and generates a pressure detection signal, and a frequency setting section that sets the inverter frequency so that the refrigerant pressure on the low pressure side converges to a predetermined set value according to the pressure detection signal. and a frequency change width setting unit that controls the change width of the inverter output frequency according to the pressure difference between the pressure detection signal and the refrigerant pressure to be converged.
JP8056684A 1984-04-20 1984-04-20 Refrigerator Granted JPS60223963A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP8056684A JPS60223963A (en) 1984-04-20 1984-04-20 Refrigerator

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP8056684A JPS60223963A (en) 1984-04-20 1984-04-20 Refrigerator

Publications (2)

Publication Number Publication Date
JPS60223963A true JPS60223963A (en) 1985-11-08
JPH0360027B2 JPH0360027B2 (en) 1991-09-12

Family

ID=13721883

Family Applications (1)

Application Number Title Priority Date Filing Date
JP8056684A Granted JPS60223963A (en) 1984-04-20 1984-04-20 Refrigerator

Country Status (1)

Country Link
JP (1) JPS60223963A (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS62175558A (en) * 1986-01-28 1987-08-01 三菱電機株式会社 Refrigerator
JPH0293237A (en) * 1988-09-30 1990-04-04 Toshiba Corp Refrigeration cycle device
JPH02263054A (en) * 1989-03-31 1990-10-25 Sanyo Electric Co Ltd Air conditioner

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5767735A (en) * 1980-10-13 1982-04-24 Toshiba Corp Air conditioner

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5767735A (en) * 1980-10-13 1982-04-24 Toshiba Corp Air conditioner

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS62175558A (en) * 1986-01-28 1987-08-01 三菱電機株式会社 Refrigerator
JPH0541906B2 (en) * 1986-01-28 1993-06-24 Mitsubishi Electric Corp
JPH0293237A (en) * 1988-09-30 1990-04-04 Toshiba Corp Refrigeration cycle device
JPH02263054A (en) * 1989-03-31 1990-10-25 Sanyo Electric Co Ltd Air conditioner

Also Published As

Publication number Publication date
JPH0360027B2 (en) 1991-09-12

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