JPS5994259U

JPS5994259U - Parallel compression refrigeration equipment

Info

Publication number: JPS5994259U
Application number: JP19020882U
Authority: JP
Inventors: 明原; 木村　誠夫; 敏明山口
Original assignee: 三菱電機株式会社
Priority date: 1982-12-14
Filing date: 1982-12-14
Publication date: 1984-06-26

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

[Brief explanation of drawings]

第１図は従来の並列圧縮式冷凍装置の冷媒回路図、第２
図は第１図の並列圧縮式冷凍装置による容量制御運転の
説明図、第３図はこの考案の並列圧縮式冷凍装置の一実
施例の冷媒ならびに電気回路図、第４図は第３図の並列
圧縮式冷凍装置による容量制御運転の説明図である。１・・・並列圧縮式冷凍装置、１ａ・・・凝縮器、１ｂ
。ＩＣ・・・圧縮機、１ｄ・・・冷媒吐出管、１ｅ・・・
冷媒吸入管、１ｆ・・・均圧均油管、１ｇ・・・インバ
ータ、１ｈ。１１・・・低圧圧力開閉器、ｌｊ、　　ｌｋ・・・補助
継電器、１１、　　ｌｒｎ、　　ｌｎ・・・電磁開閉器
、２・・・冷却装置、２ａ〜２Ｃ・・・ショーケース。なお、図中同一符号は同一または相当部分を示す。第１図− ６２ノ　　　　　λ ／ａ−μ ｉ、　Ｒ（％）Figure 1 is a refrigerant circuit diagram of a conventional parallel compression type refrigeration system;
The figure is an explanatory diagram of capacity control operation using the parallel compression type refrigeration system shown in Figure 1, Figure 3 is a refrigerant and electric circuit diagram of one embodiment of the parallel compression type refrigeration system of this invention, and Figure 4 is the same as that shown in Figure 3. It is an explanatory diagram of capacity control operation by a parallel compression type refrigeration system. 1... Parallel compression refrigeration device, 1a... Condenser, 1b
. IC...Compressor, 1d...Refrigerant discharge pipe, 1e...
Refrigerant suction pipe, 1f...Pressure equalization oil pipe, 1g...Inverter, 1h. 11...Low pressure switch, lj, lk...Auxiliary relay, 11, lrn, ln...Electromagnetic switch, 2...Cooling device, 2a-2C...Show case. Note that the same reference numerals in the figures indicate the same or corresponding parts. Figure 1-62 λ/a-μ i, R (%)

Claims

[Scope of Claim for Utility Model Registration] n units (where n is an integer) compressor, a cooling device connected to this compressor, an inverter that can continuously control the large-capacity and small-capacity compressors up to 50 to 100% of their respective rated capacities, and a refrigeration load of the cooling device. A first low-pressure pressure switch that turns on when the refrigeration load is 33% or less; a second low-pressure switch that turns on when the refrigeration load is 33% or less;
% or less, the first low-pressure switch is turned on to cut off the power supply from the AC power source to the small-capacity and large-capacity compressors, and supply the power of the inverter only to the small-capacity compressors. When the refrigeration load is within the range of 33% to 66%, the first low-pressure switch is turned on and the second low-pressure switch is turned off to control the power from either the AC power supply or the inverter to the small-capacity compressor. The supply is also cut off and the inverter power is supplied only to the large capacity compressor, and when the refrigeration load is in the range of 66 to 100%, AC power is supplied to the small capacity compressor and the large capacity compressor is supplied with AC power. 00 and 2(2n') to continuously increase the above n to 100% by supplying power to the inverter.
A parallel compression refrigeration system comprising means for performing capacity control operation on one compressor. .