JPH11148734A - Refrigerating device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To permit operation of a plurality sets of refrigerating devices in conjunction with each other without necessitating any special instrument and reduce cost therefor, by a method wherein a coil of a time limit relay of No.n+1 machine is connected to the switching circuit of No.n machine, upon using a plurality sets of refrigerating devices as one set of the device. SOLUTION: Upon using a plurality sets or two sets, for example, of refrigerating devices as one set of the same device in order to cope with the load of a big capacity, exceeding the maximum capacity of the refrigerating device, a switching circuit in a control panel is provided with the contact of a time limit relay in every devices. Then, both terminals B-B' of a coil for the time limit relay on No.2 machine are interlocked to the terminals A'-A" of a No.1 machine. Interlocking is effected to respective terminals C-C' so as to put the terminals to common use. Upon starting, when the No.1 machine is started by throwing the switch of the same machine, the time limit relay of the No.2 machine is excited, however, the coil of the same time limit relay short-circuits the contacts of the time limit relay so as to be delayed whereby the No.2 machine is started so as to be delayed, thereby restraining the starting current of the No.1 machine.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a refrigeration system used for general air conditioning and objective cooling, and a control system therefor.

[0002]

2. Description of the Related Art In the prior art, in order to operate a plurality of refrigeration units as one unit at a site, a dedicated unit for a first unit and a unit for a second unit each having a special circuit are supplied. Heat pump screw chiller unit service manual (document number CHA-9701)
As described in 7-4, an additional device has been supplied to link a plurality of refrigerating devices.

[0003]

In the above-mentioned prior art, in order to operate a plurality of refrigeration units as a single unit, a line-up of a first unit, a second unit, etc. each having a special circuit as a product is provided. There is a problem that it is necessary to supply the product because of the necessity, or there is a problem that it cannot be used interlockedly without an additional device for interlocking the refrigerating device.
In addition, simply sharing the operation switches may result in excessive starting current.

[0004]

In order to solve the above problems, a refrigeration apparatus and a control system according to the present invention have the functions described in the respective claims.

[0005]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below with reference to FIGS. FIG. 1 shows control related to the start of the present refrigeration apparatus, FIG. 2 shows control related to the start when the refrigeration apparatus is used alone, and FIG. The refrigeration system has a circuit for controlling operation and the like, a coil of a time limit relay, a contact 3 thereof, and a switch 4 for starting operation. AA 'is a terminal for receiving an operation signal, and operates when this terminal is short-circuited. BB 'is connected to both ends of the coil 2 of the timed relay. CC 'is an interlock terminal for a pump or the like connected to the refrigeration system.

When the present refrigeration apparatus is used alone, the coil 2 and the contact 3 of the time limit relay are not used as shown in FIG. When using two units as one unit, as shown in FIG.
Both ends BB 'of the coil 2 of the timed relay of the unit are connected to the first A'-A ". The interlock is connected to each CC' so as to be shared. The first switch 4 , The first unit starts up, and at the same time, the coil 2 of the time limit relay of the second unit is excited, and this coil receives the operation signal of the second unit to delay and short-circuit the contact 3 of the time limit relay of the second unit. I do.

As described above, in order to cope with a large capacity load, a plurality of refrigeration units are installed, and the use as one refrigeration unit does not require special equipment, and can be realized only by the same refrigeration unit. it can. (Also possible with refrigeration equipment of the same kind and different capacity.)

[0008]

According to the present invention, since the same refrigeration system can be supplied, each of the first and second units has a special circuit.
It is not necessary to supply a dedicated machine for the unit. In addition, a special device for linking a plurality of units is not required.

[Brief description of the drawings]

FIG. 1 is a circuit diagram related to the start of a refrigeration apparatus embodying the present invention.

FIG. 2 is a circuit diagram when a single refrigeration apparatus embodying the present invention is used.

FIG. 3 shows two refrigeration units as one example of a refrigeration apparatus embodying the present invention.
It is a circuit diagram at the time of operating as a stand.

[Explanation of symbols]

Reference numeral 1 denotes a circuit, 2 denotes a coil of a time relay, 3 denotes a contact, and 4 denotes an operation start switch.

Claims (1)

[Claims] 1. A refrigerating system having a compressor, a condenser, a decompression device, an evaporator, and a control panel for controlling the same in a closed refrigerant cycle, in order to cope with a large capacity load exceeding the maximum capacity of the device. When using one refrigeration unit of the same or different capacity as one unit, the contacts of the timed relay are equal to each unit in the switching circuit in the control panel, and one unit can be freely selected from the devices installed at the construction site. Unit No. 2, Unit ・ ・ ・ After determining Unit n, collectively operate Unit No. 1 by connecting the coil of the time limit relay of Unit n to the switching circuit of Unit n-1 without adding any special equipment A refrigeration system capable of delaying the activation of the first, second,... Units by a signal to suppress the starting current and operate a plurality of refrigeration systems as one refrigeration system.