JPS5829023A - Absorption type refrigerator - Google Patents

Abstract

PURPOSE:To decrease the consumption of an auxiliary heat source and to attain the operation with good efficiency, by controlling the amount of supply of the auxiliary heat source of two systems in proportion to cooling water or its temperature, and adjusting its control signal inversely proportinal to the temperature of a main heat source. CONSTITUTION:In a control motor operating a cooling ability controlling valve, resistors R1 and R2 split with a wiper 27 of an auxiliary potentiometer A, resistors R3 and R4 split with a wiper 28 of a feedback potentiometer B provided to a control motor D operating an auxiliary heat source controlling valve, a resistor R5 of a signal conversion potentiometer F corresponding to a discharge gas hot water inlet temperature signal of a main heat source, and an electronic balancing relay C form a bridge circuit. The wiper 28 is controlled to balance this bridge and the opening of the auxiliary heat source controlling valve is controlled in proportion to the cooling water outlet temperature and the control variable is changed inversely proportional to the temperature of the main heat source. Thus, the control is performed that the amount of consumption of inexpensive main heat source by means of waste hot water of a factory can be increased and the amount of expensive auxiliary heat source can be decreased.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an absorption refrigerating machine, which controls the supply amount of an auxiliary heat source among the heat sources of the special EZ system in proportion to the temperature of cold water or hot water, and transmits the control signal to the main heat source. By configuring the system so that it can be adjusted in inverse proportion to the temperature, the amount of consumption of the auxiliary heat source can be reduced and efficient operation can be achieved.

Absorption refrigerators are often used to obtain cold water or hot water (hereinafter referred to as cold water, etc.), and two systems of heat sources are sometimes used as the heat source for this absorption refrigerator.

for example,! When using inexpensive factory exhaust gas hot water and expensive high-temperature steam as heat sources for a system, there is a strong desire to reduce the use of high-temperature steam as much as possible.

This invention was mainly made based on these circumstances, and its specific configuration includes two heat sources, a signal conversion potentiometer for all of one of the main heat sources, and a signal conversion potentiometer connected in series to this potentiometer. A bridge circuit is constituted by a signal conversion potentiometer for the temperature of cold water or hot water, a signal conversion feedback potentiometer for the supply amount of the auxiliary heat source, and a balancing relay. It is controlled in proportion to the temperature and the control signal is mainly 1jM! t
This is an absorption refrigerator configured so that the temperature can be adjusted in inverse proportion to the temperature of the refrigerator.

That is, this invention inputs the temperature signal of the main heat source and the temperature signal of cold water, etc. to a bridge circuit using a balancing relay, outputs the supply amount control signal of the auxiliary heat source as a feed batter signal, and controls the supply amount of the cold water. The auxiliary f
This reduces waste of b#jA, provides a stable supply of cold water, etc., and reduces power costs.

The present invention will be described in detail below based on embodiments shown in the figures. Note that this invention is not limited by this.

[Basic configuration]

First, in Figure 1, an absorption chiller (1) is usually referred to as a 1-chilled water machine, with a generator (2), a condenser (3)
, an evaporator (4), an absorber (5), etc. The generator (2) is composed of a main generator section (6) and an auxiliary generator section (7).
), and the former is the hot water (t) of the exhaust gas hot water pipe (8)
R value), the latter is steam distributed! (9) High temperature steaming fi (
The high-temperature, high-pressure refrigerant Xfi can be separated and generated from the solution. By the way, the solution in the main generator section (6) is supplied from an absorber (5), which will be described later, through a solution pipe 0 equipped with an absorption liquid pump αυ, while the solution in the auxiliary generator section (9) is supplied to the main generator section. It is supplied by head from (6). The concentrated solution after generating refrigerant vapor is sent to the absorber body through the solution pipe.

# The compressor (3) is the generator C! The refrigerant vapor generated in ) is cooled and liquefied by the cooling piping (to).

The evaporator (4) pumps the liquid refrigerant supplied from the condenser (3) through the pipe (b) and the refrigerant accumulated in the lower part of the evaporator using a refrigerant pump, and sends the liquid refrigerant to the spray nozzle (2). Spray from the cold water pipe inside the evaporator to the α force. In this way, the refrigerant cools the cold water heading toward the load of the fan coil unit of the cooling device to a predetermined temperature and evaporates.

The absorber (5) sprays the concentrated solution supplied from the auxiliary generator (7) onto the cooling pipe 0 using the spray nozzle A/(to).
An evaporator (4) adjacent to this absorber absorbs the evaporated refrigerant.

〔basic action〕

Next, the operation of the absorption refrigerator (1) having the above configuration will be explained.

The refrigerant evaporated in the evaporator (4) is absorbed into a solution in the absorber (5), and is directed to the generator (2) via the solution pipe I.

In this generator, the refrigerant is separated and evaporated from the solution by being heated by the exhaust gas hot water in the main generator section (6). The cut solution is heated by high temperature steam in the auxiliary generator section (1) to separate and evaporate the cut refrigerant. The refrigerant vapor thus generated in the generator C11) is cooled and liquefied in the %JIkl unit (3) and heads to the evaporator (4), where it cools and evaporates the cold water.

On the other hand, the solution from which the refrigerant has been separated heads to the absorber (5) and absorbs the evaporated refrigerant. Repeat this below.

[Basic S configuration of control]

First, the cooling capacity control valve (to) is connected to the absorber (51 and solution pipe a).
) is connected to the outlet side of the solution pump αO, and is controlled by the cold water outlet temperature.

In other words, the cooling capacity control valve (to) is controlled by the chilled water pipe Q.
A cold water temperature signal is sent from the cold water temperature detection end 3υ installed on the outlet side of the temperature controller 7) to the proportional temperature controller (2), and the control motor is controlled via this temperature controller.

Next, an auxiliary heat source control valve (c) is provided in the steam pipe (9) and is controlled by the cooling capacity control valve (2) and each signal of the exhaust gas hot water temperature of the main heat source. In other words, the control of this auxiliary heat source control valve @ is mainly carried out by a control @ circuit member including a bridge circuit using an electronic balancing relay, and the unbalanced voltage generated when the bridge circuit becomes unbalanced causes the electronic balancing relay to be activated. operate the
This is accomplished by operating the control motor of the auxiliary heat source control valve using the mechanical contacts of this relay, and continuing the operation until the unbalanced voltage becomes zero. (to) is the temperature detection end of the main heat source, and (to) is the humidity regulator.

[Specific configuration of control]

First, in Fig. 2, the driver is an auxiliary potentiometer installed in the control motor that operates the cooling capacity control valve α, and the wiper
It is configured so that each can be moved to the WP side.

■ is the control motor 0 that operates the auxiliary heat source control valve (2)
The wiper is also operated by the feedback potentiometer installed in the control motor fD)''ee.The direction of movement of the wiper member corresponding to the opening/closing operation of the auxiliary heat source control valve (E) is on the BM-RM side. It is.

The opening is an electronic balancing relay, with opposing terminals (B
Short-circuit between P) and (BM) and between (WP) and (WM), and connect an unbalanced voltage detection element (
C1) is connected. This detection element (C1) connects the respective bases of two npn type transistors (TR0) (TR,) to the terminals (RP) (RM) and connects the emitters to each other, and also connects each collector to a DC power supply (Rec). )
The + side of each is connected through a power relay (X,) (X,), and further a transistor (TR,) (TR,)
A diode (Fo) (F, ), which can conduct current only from the emitter to the base, is connected between each emitter and base. By the way, the + side of the DC power supply (Recl) is connected between the terminals (BM) and (BP).

[F] is a signal conversion potentiometer that corresponds to the exhaust gas hot water inlet temperature signal of the main heat source, and operates the control motor via the temperature controller based on the temperature signal obtained at the temperature detection end (2) to operate the wiper 4. It is configured to be mobile. And it is connected in series to the feedback potentiometer (6).

A bridge circuit is formed by assembling the electronic balancing relay 〇 with the above configuration and each potentiometer (A)@lead.

[Specific control operation]

The equilibrium condition of this bridge circuit is that the terminal (WP) side of the resistor divided by the wiper ■ of the auxiliary potentiometer is the resistor (R1), the terminal (BP) side is the resistor (Rm), and the wiper (2 ), connect the terminal (WM) side of the resistor to the resistor (R1) and the terminal (B
The M) side is the resistance (R4), and the effective part of the resistance divided by the wiper blade of the potentiometer (G) is the resistance (R6).
), and if the reactive part is the resistance (R6), then RIR4W R, (R, + R,)! .

Further, all the resistances of the potentiometers (A), (5), and (2) are set to the same resistance (Ro), and RIRz
x Rs + R45=R6+ R@zR@ (si
la60).

Here, the opening degree of the cooling capacity control valve a is 1%, the temperature of the exhaust gas hot water (Ey%), the opening degree of the auxiliary heat source control valve (2) is 2%, and x(100-g)-z( 100-x+y) Therefore, when the ξ angle is shown in a graph, it becomes as shown in FIG.

However, the opening degree X% is determined to be 100-04 at 9-5°C, and the temperature y is determined to be 100-0% at 85-75°C.

　　.

That is, the opening degree of the auxiliary heat source control valve (2) is controlled in proportion to the cold water outlet temperature, and the opening degree of the auxiliary heat source control valve (2) is controlled in proportion to the cold water outlet temperature. l! The controlled amount can be further changed in inverse proportion to the temperature of Il#.

Therefore, the auxiliary heat source can be used efficiently, and in particular, excessive input that tends to occur when two heat sources are used can be prevented. main#! When using inexpensive S hot water, solar hot water, or engine cooling water from the factory as an auxiliary heat source, use expensive steam, gas, or oil as an auxiliary heat source.
Especially effective.

[Other opportunities for control]

activation of the wiper (2) of the auxiliary potentiometer (2);
Furthermore, the wiper 4 of the signal conversion potentiometer η may be operated by a bellows that is activated by temperature.

In addition, although the above embodiment is a case of a cold water machine, it can be similarly applied to a hot water machine or a cold/hot water machine.

As a mata balancing relay, sli! In addition to the Densenari balancing relay in the example, it is possible to use a 1-module troll motor (see Japanese Patent No. 61-10954).

[Brief explanation of the drawing]

FIG. 1 is a functional explanatory diagram showing an embodiment of an absorption chiller according to the present invention, FIG. 2 is a control circuit diagram thereof, and FIG. This is a relationship graph. (1)...Absorption refrigerator, (!)-generator, (8
)...Exhaust gas hot water piping, (9)-...Steam piping, α
η...chilled water piping, OI...cooling capacity control valve, (c)--auxiliary heat source control valve, -1-control circuit, (c)--main heat source temperature detection end, (2)... Auxiliary potentiometer, ■...Feedback potentiometer 1 meter, 0...Electronic balancing relay, 0...Signal conversion potentiometer.

Claims (1)

[Claims] A 1 m system of heat sources is provided, with a signal conversion potentiometer for the temperature of one of the main heat sources, a signal conversion potentiometer for the temperature of cold or hot water connected in series with this potentiometer, and the supply amount of the auxiliary heat source. A bridge circuit is constructed by a signal conversion feed potentimeter and a balancing relay, and the supply amount of the auxiliary heat source is controlled in proportion to the temperature of cold water or hot water, and the control signal is changed to the temperature of the main heat source. An absorption chiller configured to be adjusted in inverse proportion.