KR960000308Y1 - Pump cavitation prevention system in asorption type refrigerator - Google Patents

Abstract

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Description

Absorption chiller prevents cavitation of the pump

1 is a schematic diagram of an absorption chiller preventing cavitation of a pump according to the present invention.

* Explanation of symbols for main parts of the city

1: regenerator 2: absorber

3: condenser 4: evaporator

5: heat exchanger 6: cold water pipe

7: hot water pipe 8: solution spray pump

9: solution circulation pump 11: level switch

The present invention relates to an absorption chiller, and in particular, to increase the concentration of the solution in the absorption chiller, and to transfer the concentrated solution to the absorber in the regenerator that generates the refrigerant steam, while using the required pump to prevent the cavitation of the solution spray pump It relates to an absorption chiller.

Absorption-type freezer is a device that cools by flowing cold water in the cold water pipe (6) using the property of taking heat away when the refrigerant (water) in the evaporator (4) evaporates. The refrigerant vapor generated at this time is absorbed by the lithium bromide (LiBr) aqueous solution sprayed on the cooling water pipe of the absorber (2).

Lithium bromide aqueous solution absorbing the refrigerant vapor is thinned. The diluted aqueous solution is transferred to the regenerator (1) and sprinkled on a hot water pipe (7) to heat the solution. When the solution becomes thicker, the solution is sent to the absorber (2) again. Used to absorb the refrigerant vapor generated in 4).

Steam generated when the solution is heated in the regenerator 1 to increase the concentration with the solution is produced in the condenser (3) to produce a liquid refrigerant to the evaporator (4) is used as a liquid refrigerant in the evaporator (4).

When the absorption chiller is stopped, the amount of solution in front of the solution spray pump (8) is small. Therefore, if the solution circulation pump (9) and the solution spray pump (8) are operated at the same time for the first start, cavitation occurs in the solution spray pump (8), and thus in the absorption chiller that installs the currently used solution spray pump (8). The solution spray pump 8 is installed behind the solution heat exchanger 5 to prevent such cavitation. However, in this case, the net positive suction head is large, which makes the pump large and inevitably expensive. .

An object of the present invention is to provide a solution spray pump cavitation prevention device of the absorption refrigeration freezer to be able to prevent the cavitation of the pump while using a small solution spray pump to overcome this problem.

This object of the present invention can be achieved by providing a level spray pump cavitation prevention device for an absorption chiller which operates the spray pump when the solution reaches the level switch at the start-up by installing the level switch in the regenerator.

Solution spray pump cavitation prevention device of the absorption chiller according to the present invention will be described in detail below with reference to the accompanying drawings.

As shown in FIG. 1, the absorption chiller according to the present invention includes a regenerator 1, an absorber 2, a condenser 3, an evaporator 4, and a heat exchanger 5, and in the regenerator 1 In order to prevent cavitation of the absorption chiller having the solution spray pump 8 installed on the pipe 10 leading to the heat exchanger 5, the appropriate level L of the concentrated lithium bromide aqueous solution in the regenerator 1 is sensed. And a level switch 11 for operating the solution spray pump 8 is provided in the regenerator 1.

Therefore, in the present invention, since the solution spray pump 8 is installed in front of the solution heat exchanger 5, the effective suction head can be reduced, and thus a compact pump can be used.

Referring to the operation of the cavitation prevention device of the present invention, when the start of the absorption chiller, when the lithium bromide aqueous solution in the regenerator 1 does not maintain an appropriate level, cavitation may occur, the level switch 11 is a solution spray pump. (8) does not operate, so only the solution circulating pump 9 is operated to supply the lithium bromide aqueous solution from the absorber 2 to the regenerator 1 through the solution circulating pump 9 and the solution heat exchanger 5, and thus, the regenerator ( 1) When the aqueous solution of lithium bromide gradually increases and reaches the appropriate level (L) to prevent cavitation, the level switch 11 is operated to operate the solution spray pump 8 while the solution spray pump ( Cavitation of 8) is prevented.

Thus, the cavitation prevention device according to the present invention uses a low-capacity pump by installing a solution spray pump in front of the heat exchanger. Cavitation can be prevented.

Claims (1)

A solution spray pump comprising a regenerator (1), an absorber (2), a condenser (3), an evaporator (4), and a heat exchanger (5), and a pipe (10) from the regenerator (1) to the heat exchanger (5). In order to prevent the cavitation of the absorption chiller equipped with (8), by the level switch 11 installed in the regenerator 1 after the level of the regenerator 1 reaches an appropriate level when the refrigerator is started from the stopped state. An absorption chiller which prevents the cavitation of the pump, characterized in that the solution spray pump (8) is started.