JPS6022255B2 - Control device for dual effect absorption chiller - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a control device for a dual-effect absorption refrigerating machine, which allows the absorption liquid pump to operate without stopping even when the liquid level of the high temperature generator rises at startup and during partial load. This is designed to extend the life of the pump and eliminate noise when the pump starts and stops.

Normally, in a double-effect absorption refrigerator that uses water as a refrigerant and a salt solution as an absorbent, the pressure inside the high-temperature generator increases due to the steam generated from the absorbing liquid, and the flow of intermediate liquid increases between the high-temperature generator pressure and the low-temperature generator. It is determined by the pressure difference.

On the other hand, the pump head of the absorption liquid pump is determined based on the assumption that everyone is operating the load, so when starting up, at low load, or when the cooling water temperature is extremely low, the pressure inside the high-temperature generator is low and the absorber pumps high temperature. The amount of absorption liquid going up to the generator increases, and the amount of intermediate liquid is also small because the pressure difference between the high temperature generator and the low temperature generator is small.

Therefore, the liquid level inside the high temperature generator rises.

To prevent this, conventionally, a liquid level relay installed in the high temperature generator temporarily stops the absorption liquid pump when the liquid level rises to a certain level. Temporary stopping of the absorption liquid pump means interruption of the refrigeration effect, and frequent activation of the pump consumes a lot of electricity, which has a negative effect on the pump motor, and also causes noise when starting and stopping, backflow of dilute liquid, etc. There were drawbacks such as poor refrigeration performance.

The present invention has been made to solve the above-mentioned drawbacks, and an embodiment shown in the drawings will be described below.

1 is a direct-fired high-temperature generator that has a combustion heating chamber 2 of gas or oil, etc. and scarlet tubes 3, 3, etc. connected to the heating chamber, and heats and separates cold soot from a dilute liquid; 4 is the high-temperature generator; A low temperature generator 5 uses the refrigerant vapor sent out from the generators 1 and 4 as a heat source to reburn it and further heat and separate the soot in the intermediate liquid, and a cooler 6 condenses and cools the soot flowing in from both the generators 1 and 4. A condenser, 7 is an evaporator that obtains cold water for cooling from a water cooler 8 by using the latent heat when the liquid refrigerant from the condenser 5 is dispersed and vaporized, and 9 is an evaporator that uses the low temperature generator 4 to generate cold soot. The absorbers 10 and 11 are capable of maintaining the inside of the evaporator 7 at a low pressure and continuously supplying cold water by scattering the separated liquid and absorbing the soot vapor inside the vessel. The low-temperature heat exchanger and the high-temperature heat exchanger are composed of a refrigerant conduit 12, a refrigerant liquid down-flow pipe 13, a reagent circulation path 15 with a liner medium pump 14, a dilute liquid pipe 17 with an absorption liquid pump 16, ]8 , 19, intermediate liquid 2, 21, and concentrated liquid pipes 22, 23 are connected to form a refrigeration cycle.

24 is a water heater attached to the high temperature generator 1.

25 and 26 are the absorber 9, the dilute liquid pipe 17 on the outlet side of the absorption liquid pump 96, and the intermediate liquid pipe 20 on the high temperature generator 1 side.
A bypass pipe having solenoid valves V, V2 respectively provided between the solenoid valves V. V2 is opened and closed by the operation of the liquid level detection electrode relay 27 attached to the high temperature generator 1', and the absorption liquid pump turtle 6 is also opened and closed by the liquid level detection electrode relay 27 attached to the high temperature generator 1'.
It starts and stops when activated.

At the time of startup and under low load, there is no pressure difference between the high temperature generator 1 and the low temperature generator 4, so the position of the bypass pipe 26 connecting the two intermediate liquid pipes is determined so as to make effective use of the head difference.

The liquid level detection electrode relay 27 includes a ground fin pole A, a pump operation start electrode B, a valve opening electrode C, and a pump operation stop electrode D.

Therefore, when the liquid level of the high temperature generator turtle rises above the valve opening crab pole C, the fin magnetic valves V. ,V2
The diluted liquid and intermediate liquid are directly returned to the absorber 9 by opening, and the liquid level in the high temperature generator 1 is lowered to a predetermined level while the absorption liquid pump 16 continues to operate.

When the liquid level falls below a predetermined level, the solenoid valves V, , V2
is closed and normal operation is performed. As described above, the present invention provides a dual effect absorption refrigerator in which a high temperature generator, a low temperature generator, a condenser, an evaporator, an absorber, and a heat exchanger are connected via piping to form a refrigeration cycle. A bypass pipe with a solenoid valve that communicates with the absorber is provided in the dilute liquid pipe on the absorption liquid pump outlet side and the intermediate liquid pipe on the high temperature generator side, which are provided between the exchangers. Since a detection electrode relay is installed and the electromagnetic valve is opened and closed by the operation of the electrode relay, even if the liquid level in the high temperature generator rises while the refrigerator is operating, the absorption liquid pump will not start. The liquid level can be lowered to a predetermined level while continuing operation without having to be searched, which extends the life of the absorption liquid pump and eliminates the noise generated during exasperation.Also, the power consumption of the pump motor is low. This also prevents deterioration in refrigeration performance.

[Brief explanation of the drawing]

The drawing is a circuit diagram of a dual-effect absorption refrigerator according to the present invention. Military...High temperature generator, 9...Absorber, 1
6... Absorption liquid pump, V,, V2... Solenoid valve, 25, 26... Bypass pipe, 27... Electrode relay for liquid level detection.

Claims (1)

[Claims] 1. In a dual-effect absorption refrigerator in which a refrigeration cycle is constructed by connecting a high temperature generator, a low temperature generator, a condenser, an evaporator, an absorber, and a heat exchanger with piping, a bypass pipes each having a solenoid valve communicating with the absorber are provided in the dilute liquid pipe on the outlet side of the absorption liquid pump and the intermediate liquid pipe on the high temperature generator side, and an electrode relay for liquid level detection is provided in the high temperature generator, A control device for a dual-effect absorption refrigerator, characterized in that the electromagnetic valve is opened and closed by the operation of the electrode relay.