JPS58130972A - Absorption type refrigerator - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Application of the Invention] The present invention relates to an absorption refrigerator having at least one regenerator, a condenser, an evaporator, a heat exchanger and refrigerant and solution circulation pumps. .

[Prior art]

In conventional absorption refrigerators of this type, when the temperature of the cooling water in the condenser or absorber becomes lower than the standard value, the refrigerator is operated by detecting the refrigerant liquid level and starting and stopping the refrigerant pump. We are making it possible to continue.

When controlling the amount of refrigerant sprayed by detecting the refrigerant liquid level in this way, the amount of sprayed increases or decreases as the refrigerant liquid level rises or falls. Since the increase or decrease in the amount of spraying directly affects the increase or decrease in refrigeration capacity, it is not possible to control over a wide range, and it is necessary to limit the control to near the lower limit of the liquid level.Actually, it serves to prevent cavitation in the refrigerant pump due to a drop in the refrigerant liquid level. It is only meaningful to the extent that it fulfills its purpose.

On the other hand, in the control in which the refrigerant pump is operated and stopped based on the detection of the refrigerant liquid level, the refrigerating capacity significantly hunts when the liquid level is near the lower limit, making it impossible to stably supply cold water. In order to expand the operating range of the refrigerator, it is necessary to increase the amount of refrigerant held.

The cooling water inlet temperature of an absorption chiller is normally about 32r, but it varies over a wide range depending on the customer's usage and the outside air temperature. In the case of a device designed based on 32C, the lower limit of the corresponding cooling water temperature tli2
It is about 0r.

[Purpose of the invention]

The purpose of the present invention is to set the lower limit of the cooling water temperature that can be operated to lθ~15
It is an object of the present invention to provide an absorption chiller capable of stably supplying cold water over the entire area.

[Summary of the invention]

The present invention is characterized in that the liquid level in the absorber is detected and the amount of solution sprayed onto the heat transfer tube is increased or decreased.

In this way, changes in cycle concentration and circulation amount due to fluctuation factors such as cooling water temperature and load can be suppressed within a certain range, the permissible fluctuation range of cooling water temperature and load can be increased, and the refrigerant inventory can be limited. It can be handled by quantity.

[Embodiments of the invention]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings.

First, a single-effect absorption refrigerating machine will be described, the configuration of which is a beautiful example of an absorption refrigerating machine, and the refrigerant and solution circulation cycle shown in FIG.

In Fig. 1, 1 is an evaporator, 2 is cooling water flowing through 3 heat transfer tubes of the evaporator L, 5 is a solution circulation pump, 6 is a heat exchanger, 7 is a regenerator, 8 is a condenser, and 9 is a It is a refrigerant pump.

The refrigerant (water) present on the shell side of the evaporator 1, which is kept at a low pressure, takes heat from the cold water 2 flowing through the heat transfer tube and evaporates to perform a freezing action, and the evaporated refrigerant gas flows to the absorber 3. . Inside the shell of the absorber 3, there is an aqueous lithium bromide solution maintained at a constant temperature by the cooling water 4 flowing through the heat transfer tube, so the refrigerant gas is absorbed into this aqueous solution and turned into a dilute solution. Become.

The dilute solution is fed to the regenerator 7 via the heat exchanger 6 by the solution circulation bone pump 5. This fed dilute solution is evaporated by a heat source such as high-temperature steam in the regenerator 7 and separated into refrigerant vapor and a concentrated solution. The refrigerant vapor reaches the condenser 8, where it is cooled by the cooling water 4 flowing through the heat transfer tube and becomes a liquid refrigerant.

This liquid refrigerant is returned to the evaporator 1 to form a refrigeration cycle.

On the other hand, the concentrated solution generated by separation of the refrigerant in the regenerator 7 is returned to the absorber 3 via the heat exchanger 6, and again absorbs refrigerant vapor from the evaporator 1 to become a dilute solution. form.

Next, the main parts of the embodiment of the present invention will be explained with reference to FIG. 2. Reference numeral 3 denotes an absorber incorporating 3 m of heat exchanger tubes, 10 is connected to the solution circulation bong 5 (FIG. 1), and the heat exchanger tube 3a is connected to the absorber 3. A solution dispersion pipe installed above, 11 a bypass pipe connected in the middle of the solution dispersion pipe 10, 12 a float valve having a float 12a provided in the bypass pipe 11, 15F
i. Fill with the liquid level of the solution in the absorber 3.

Since this embodiment has the above-described structure, when the liquid level 15 rises, the p-float pulp 12 is opened by the action of the 70-t 12a, so that part of the solution flowing through the solution dispersion pipe 10 is It flows out into the absorber 3 via the bypass pipe 11. Conversely, when the liquid level 15 decreases, the float valve 12ri
The amount of gradual closing eventually becomes fully closed, and the outflow from the bypass pipe 11 to the absorber 3 is stopped.

The rise in the liquid level 15 in the absorber 3 as described above indicates that the cycle concentration is decreasing. If the amount of solution sprayed is reduced at this time, the cycle concentration will increase. By controlling in this way, it is possible to suppress the cycle concentration within a certain fluctuation range in response to changes in cooling water temperature and load, especially decreases in load, so the cooling temperature and It is possible to configure a cycle that can cope with changes in load and is stable at low cooling water temperatures.

In this embodiment, the float valve 12 is provided in the bypass pipe 11, but instead of this, as shown in FIG.
A control valve 13 is provided in the liquid level detector 14.
It is possible to obtain the same effect by connecting it to .

〔Effect of the invention〕

As described above, according to the present invention, it is possible to supply stable cold water (refrigeration capacity) against fluctuations in cooling water temperature and load. The lower limit of the cooling water temperature can be expanded to a much lower temperature level than usual, the amount and space of refrigerant held can be reduced, and the liquid level in the absorber can be kept below a certain level.

[Brief explanation of drawings]

FIG. 1 is a schematic diagram of a typical example of an absorption refrigerator, and FIGS. 2 and 3 are sectional views showing an embodiment of the present invention. 3...Absorber, 3a...Heat transfer tube, 1o...Solution distribution tube, 11...Bypass! , 12...Float valve, 13...Control'X1ff.

Claims (1)

[Claims] A bypass pipe is connected to the solution dispersion pipe installed above the heat transfer pipe of the absorber, and a bypass amount control valve is provided in this bypass pipe that operates according to fluctuations in the height of the solution level in the absorber, and the bypass amount is An absorption chiller characterized in that the control valve is operated in such a way as to increase the bypass amount when the solution level rises and to decrease the bypass amount when the solution level falls. .