JPH0117012Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Field of Application of the Present Invention] The present invention relates to a dual-effect absorption chiller/heater, and more particularly to an improvement in the structure of controlling the capacity at multiple positions by controlling the flow rate of an intermediate concentrated solution.

[Background of the idea]

Generally, when performing multi-position control of capacity in a water-lithium salt type dual-effect absorption chiller/heater, a method is adopted in which the circulating flow rate of the solution is varied using a control valve or the like. As this control valve, one is known in which an intermediate concentrated solution flow rate control valve is provided in the piping route between the high temperature regenerator and the low temperature regenerator, and the piping resistance is provided according to input changes in multi-position control. There is.

FIG. 1 is a system diagram of a water-lithium salt type dual-effect absorption chiller/heater having this type of control means.
A high temperature regenerator 1 into which the dilute solution is introduced is heated by a heating means such as a burner, and the solution is separated into a high temperature refrigerant vapor and an intermediate concentrated solution via a separator 2. One of the separated refrigerant vapors is led to the low-temperature regenerator 3, and the other intermediate concentrated solution is led to the low-temperature regenerator 3 after passing through the first heat exchanger 4 installed in the dilute solution introduction pipe to the high-temperature regenerator 1. I am beginning to be guided. In the low-temperature regenerator 3, the intermediate concentrated solution is further concentrated by separating the refrigerant vapor by heat exchange with the high-temperature refrigerant vapor. The concentrated solution is transferred to a second heat exchanger adjacent to the first heat exchanger 4.
It is guided into the absorber 6 through the heat exchanger 5, absorbs the refrigerant and becomes a dilute solution, and then passes through the solution circulation pump 7 and the concentrated solution flow rate control valve 8 to the second and first heat exchangers 5, 4. After absorbing heat at , it is circulated and supplied to the high temperature regenerator 1. Further, the high temperature refrigerant vapor separated in the high temperature regenerator 1 passes through the low temperature regenerator 3 and is led to the condenser 9 together with the refrigerant vapor separated in the low temperature regenerator 3.
It is condensed by the cooling water pipe 10 and becomes a refrigerant liquid.
The refrigerant liquid passes through the liquid reservoir 11 and the distribution pipe 12 to the evaporator 1.
3, where it evaporates and removes heat from the fluid in the hot and cold water pipe 14 to obtain cold water, which is absorbed into the concentrated solution. In addition, in order to obtain hot water from the cold/hot water pipe 14,
A pipe line is provided to directly lead the intermediate concentrated solution to the evaporator 13, and a cooling/heating switching valve 15 is interposed in this pipe line.

In such an absorption chiller/heater, in order to perform multi-position control of the capacity while maintaining the pressure difference between the high temperature regenerator 1 and the low temperature regenerator 3, the intermediate concentrated solution from the high temperature regenerator 1 to the low temperature regenerator 3 is The piping route, specifically the piping 1 from the first heat exchanger 4 to the low temperature regenerator 3
6 is provided with an intermediate concentrated solution flow rate control valve 17, and the control valve 17 is used to adjust the pipe resistance. This action makes it possible to adjust the amount of solution circulation and perform multi-position control.

By the way, the structure of the conventional intermediate concentrated solution flow rate control valve 17 is as shown in FIG.
A part of the pipes were made into branch pipes 16A, 16B, and gate valves 17A, 17B having different valve diameters were interposed therebetween. When this control valve 17 performs three-position control of high, middle, and low, both gate valves 17A and 17B are open at the high position, and only the gate valve 17A with a large valve diameter is open at the middle position. Each control at the low position is performed by opening only the other gate valve 17B.

However, with the above structure, when performing multi-position control of 3 or more positions, a large number of gate valves are required, making the structure complex, and the flow rate is uniquely determined by the valve diameter of each gate valve. This makes fine adjustment difficult.

[Purpose of invention]

The present invention focuses on the above-mentioned conventional problems, and makes it possible to arbitrarily change the pipe resistance of the intermediate concentrated solution using a single flow rate control valve, making it possible to easily perform multi-position control and fine adjustment. The purpose of this invention is to provide a dual-effect absorption chiller/heater that can be used.

[Summary of the idea]

In order to achieve the above object, the dual-effect absorption chiller/heater according to the present invention has an intermediate concentration solution separated in the high-temperature regenerator into which the dilute solution is introduced, and a pipe route for supplying the intermediate concentrated solution to the low-temperature regenerator. In a dual-effect absorption chiller/heater equipped with a concentrated solution flow rate control valve, the intermediate concentrated solution flow rate control valve includes a valve body having a throttle passage loosely inserted into a valve casing forming inflow and outflow openings; The valve body is formed so as to be able to be brought into contact with and separated from one opening, and the intermediate concentrated solution flow rate control valve is configured to be repeatedly opened and closed based on an opening/closing time ratio according to the required intermediate concentrated solution flow rate. .

With this configuration, the flow rate when the control valve is open corresponds to the high position control, and the flow rate through the throttle channel when the valve is closed corresponds to the low position control, and the flow rate between the high position and the low position is controlled by the opening and closing of the valve body. By repeating the operation, it is possible to perform arbitrary control and to control an arbitrary intermediate position.

[Example of idea]

A dual-effect absorption chiller/heater according to an embodiment of the present invention will be described below.

The dual-effect absorption chiller/heater according to this embodiment is as follows:
The only difference is the configuration of the intermediate concentrated solution flow rate control valve, and the other configurations are the same as shown in Figure 1, but the main configuration is high-temperature regeneration that heats a dilute solution in which a refrigerant is absorbed into a lithium salt solution. a separator 2 that separates the refrigerant vapor from the high-temperature regenerator 1 and the intermediate concentrated solution, and a low-temperature regenerator 3 that heats the intermediate concentrated solution with the refrigerant vapor from the separator 2 after lowering its temperature.
A condenser 9 that condenses the refrigerant from this low-temperature regenerator
, an evaporator 13 that evaporates the liquid refrigerant from the condenser 9, and an absorber 6 that absorbs the refrigerant evaporated in the evaporator 13 into the concentrated solution from the low-temperature regenerator 3.

In such a dual-effect absorption chiller/heater, the intermediate concentrated solution flow rate control valve provided in the middle of the intermediate concentrated solution piping route from the high temperature regenerator 1 to the low temperature regenerator 3 is configured as shown in FIG. ing. That is, this control valve 20 has a cylindrical valve casing 21.
The valve casing 21 has a first heat exchanger 4.
An inflow opening 22 through which the intermediate concentrated solution flows in is formed on one end surface thereof, and an outflow opening 23 through which the intermediate concentrated solution flows out into the low temperature regenerator 3 is formed on its side wall surface. Further, a cylindrical valve body 24 is inserted into the valve casing 21 and extends in the axial direction of the valve casing 21, so that one inlet opening 22 can be opened and closed by reciprocating the valve body 22 in the axial direction. Here, the valve body 24
has a small diameter that forms an annular gap 25 between the valve casing 21 and the inner peripheral surface of the valve casing 21.
It is loosely inserted into the The cross-sectional area of this gap 25 is set to correspond to the intermediate concentrated solution flow rate during high position control of the system. Further, the gap 25 is maintained by the valve body 24 so that the outflow opening 23 is always maintained even in the closed position.
It is in communication with. Further, the valve body 25 has an inflow opening 22 and an outflow opening 23 even in the closed state.
An L-shaped constricted channel 26 is formed so that an intermediate concentrated solution can flow therethrough. In the closed state, the throttle channel 26 has both ends connected to the casing side openings 22, 2.
3, and its opening cross-sectional area is set to be smaller in diameter than the openings 22 and 23 so as to correspond to the intermediate concentrated solution flow rate during low position control.

The reciprocating opening/closing operation of the valve body 24 with respect to the valve casing 21 is performed by a known driving means such as an electromagnetic valve mechanism that can adjust the opening/closing time.

According to the dual-effect absorption chiller/heater provided with such an intermediate concentrated solution flow rate control valve 20, control between a high capacity position and a low capacity position can be easily and arbitrarily performed. That is, when the valve body 24 is moved away from the inflow opening 22 to open the valve, the passage cross-sectional area of the gap 24 is set to ensure an intermediate concentrated solution flow rate corresponding to the high position control, so that the flow rate as shown in FIG. Like,
High position control is possible with high flow rate from the time the valve is opened. Further, when the valve is closed, only the throttle channel 26 is communicated, so that an intermediate concentrated solution corresponding to the cross-sectional area of the throttle channel 26 flows, as shown in FIG. 4C, so that low flow rate and low position control can be achieved. In the case of intermediate position control, the valve body 24 is continuously opened and closed at regular intervals as shown in FIG. 4B, and the total flow rate flowing into the low temperature regenerator 3 per time is controlled. This total flow rate can be adjusted arbitrarily by changing the ratio between the open time and the closed time of the control valve 20, and therefore the amount of solution circulated in the system can be controlled not only in stages but also continuously. This allows for targeted multi-position control.

[Effect of idea]

As described above, according to the present invention, the flow rate from the solution pump can be controlled continuously and arbitrarily by adjusting the opening/closing time of one control valve in response to input changes, making multi-position control and fine adjustment easy. It can be a dual-effect absorption chiller/heater that can be used to

[Brief explanation of the drawing]

Fig. 1 is a system diagram of a dual-effect absorption chiller/heater, Fig. 2 is a configuration diagram of a conventional intermediate concentrated solution flow rate control valve, and Fig. 3 is a sectional view of the main parts of the control valve used in the example. FIGS. 4A to 4C show opening and closing patterns of the control valve. 1... High temperature regenerator, 2... Separator, 3... Low temperature regenerator, 6... Absorber, 9... Condenser, 13...
Evaporator, 16... Intermediate concentrated solution piping, 17, 20...
...Intermediate concentrated solution flow rate control valve, 21...Valve casing, 22...Inflow opening, 23...Outflow opening, 24
... Valve body, 25 ... Gap, 26 ... Throttle channel.

Claims (1)

[Scope of utility model registration request] In a dual-effect absorption chiller/heater, the intermediate concentrated solution is separated in a high temperature regenerator into which the dilute solution is introduced, and an intermediate concentrated solution flow rate control valve is provided in the piping route for supplying the intermediate concentrated solution to the low temperature regenerator. The solution flow rate control valve is configured such that a valve body having a throttle passage is loosely inserted into a valve casing having inflow and outflow openings, and the valve body is formed so as to be able to be moved into and out of one of the openings, and the intermediate concentrated solution flow rate is controlled. A dual-effect absorption chiller/heater characterized in that the control valve is configured to be repeatedly opened and closed based on an opening/closing time ratio corresponding to a required flow rate of an intermediate concentrated solution.