JPH05264132A - Gas extractor for absorption type water heater/cooler - Google Patents

Abstract

PURPOSE:To obtain a gas extractor for an absorption cold/warm water machine in which non-condensible gas generated in a refrigerator during room heating is automatically extracted during the room heating to eliminate a decrease in capacity due to the gas in the case of switching to room cooling. CONSTITUTION:The gas extractor for an absorption cold/water machine comprises a heat exchanger 14 for heat-exchanging part of solution with warm water, a liquid trickle type extractor 16 for entrapping non-condensible gas therein while sucking the gas by using the solution, and a vapor gas separator 19 for separating the entrapped gas. Further, the extractor comprises an extraction tank 21 for storing separated non-condensible gas, a liquid level switch 19a for sensing a quantity of the stored gas, a water ejector 14 for discharging the gas out of a refrigerator, and a solenoid valve 25, and has tubes for connecting them.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an bleeder for an absorption chiller-heater, and more particularly to absorption chilled-hot water capable of switching between chilled water supply (hereinafter referred to as "cooling") and hot water supply (hereinafter referred to as "heating"). It concerns the extraction of air when heating a machine.

[0002]

2. Description of the Related Art Originally, since non-condensable gas generated in the refrigerator during the heating operation of the absorption refrigerator does not hinder the heating operation, there is no technique for automatically extracting air during the heating operation. At the time of switching to the cooling operation, maintenance personnel and the like used a vacuum pump to extract air. Regarding automatic bleeding during the cooling operation of the absorption chiller, a number of methods are known, for example, Japanese Patent Laid-Open No. 2-290481.

[0003]

The non-condensable gas generated in the refrigerator during the heating operation does not hinder the heating operation, but when the mode is switched to the cooling operation, the cooling capacity is remarkably reduced and smooth heating is prevented. It was an obstacle to switching the operation to cooling. Therefore, when switching the operation from heating to cooling, it is necessary to artificially extract the noncondensable gas to the outside with a vacuum pump.

The present invention has been made to solve the above-mentioned problems of the prior art. The non-condensable gas generated in the refrigerator during the heating operation is automatically extracted during the heating operation and switched to the cooling operation. To provide a bleeder for an absorption chiller-heater that eliminates the deterioration of capacity due to non-condensed gas when
That is the purpose.

[0005]

In order to achieve the above object, the most basic constitution of the extraction device for an absorption chiller-heater according to the present invention is an absorption chiller-heater having a switching operation function between cooling and heating. At least, a means for sucking the non-condensable gas in the heat exchanger for heating is provided by utilizing the suction force of lithium bromide during the heating operation.

In order to achieve the above object, a specific structure of the extraction device of the absorption chiller-heater according to the present invention has a suction power of lithium bromide in the absorption chiller-heater having a switching operation function of cooling and heating. Means for sucking the non-condensable gas in the heat exchanger for heating, and a device for sending the sucked non-condensable gas into the tank together with the absorbing liquid by the entrainment action of the flowing down of the absorbing liquid. It is equipped with a device that separates the noncondensable gas and the absorption liquid sent to the device and extracts and stores only the noncondensable gas, and a device that removes the stored noncondensable gas to the outside of the refrigerator by a water ejector. ..

Further, in order to achieve the above object, a more specific structure of the extraction device of the absorption chiller-heater according to the present invention is as follows.
In an absorption chiller-heater having a function of switching between cooling and heating, a heat exchanger for extraction air that exchanges part of the absorption liquid with hot water, and a liquid flow-type extraction air that draws in noncondensable gas using the absorption liquid. Equipment, gas-liquid separator for separating entrained non-condensable gas, extraction tank for storing separated non-condensable gas, liquid level switch for detecting accumulated non-condensable gas, non-condensable gas outside refrigerator It consists of a water ejector and a solenoid valve to be discharged to a pipe and a piping system connecting them.

[0008]

The function of the above technical means is as follows. Among the absorption chiller-heaters, those that have a switching operation function for cooling and heating will cause the non-condensable gas generated inside the refrigerator during heating operation to accumulate in the heating heat exchanger with the lowest internal pressure. ..

Therefore, during heating operation, a part of the solution (absorption liquid) is branched from the discharge side of the solution pump, and the temperature of the solution is lowered by exchanging heat between the solution and a part of the hot water for supply. Then, the saturation pressure of this solution becomes lower than the pressure in the heat exchanger for heating in which the non-condensed gas is accumulated, so when the solution is dropped in an airtight small container, the pressure in the small container becomes It is lower than the pressure in the heating heat exchanger. Therefore, the small container and the portion of the heating heat exchanger where the non-condensable gas is accumulated can be connected by a pipe to guide the non-condensable gas into the lower-pressure small container.

In the small container, the dropped solution is drawn in while drawing in the non-condensed gas, and together, drops into the gas-liquid separation tank provided below. In the gas-liquid separation tank, the non-condensable gas accumulates at the top and only the solution accumulates at the bottom due to gravity.
The non-condensable gas is stored in the extraction tank for storing the non-condensable gas provided above the gas-liquid separation tank, and the separated solution is returned to the heating cycle. The extraction tank is connected to the liquid ejector via a valve, and when a certain amount or more of non-condensable gas is accumulated in the extraction tank, it is detected by a liquid level gauge or a pressure gauge, and the valve is opened after flowing water to the water ejector. As a result, the non-condensable gas in the extraction tank is sucked out by the water ejector and removed to the outside of the refrigerator.

According to the present invention, the non-condensable gas generated in the refrigerator during the heating operation or the non-condensable gas that has entered from the outside during the heating operation can be automatically extracted.

[0012]

Embodiments of the present invention will be described below with reference to FIGS. 1 and 2. [Embodiment 1] FIG. 1 is a system diagram of a heating cycle of an absorption chiller-heater according to an embodiment of the present invention. In FIG.
1 is a heat exchanger for heating, 2 is an absorber, 3 is a regenerator, 4 is a refrigerant pump, 5 is a solution pump, 6 is a solution spray pump, and these are connected by a pipe to form an absorption chiller-water heater. There is. Reference numeral 13 is a branch pipe connecting the discharge side pipe 7 of the solution pump 5 and a bleeding heat exchanger 14 described later.

Reference numeral 14 is a bleed heat exchanger, 16 is a liquid flow down bleeder, 17 is a bleed pipe connecting the vicinity of the heat transfer pipe 12 of the heating heat exchanger 1 and a small container of the liquid down bleeder 16, 19
Is a gas-liquid separator, 21 is an extraction tank, 23 is a water solenoid valve, 2
Reference numeral 4 is a water ejector, and 25 is a bleed solenoid valve, which are connected by a pipe to constitute an automatic bleed system for heating. The automatic air extraction device for heating is a device for sucking the non-condensable gas in the heat exchanger 14 for heating by utilizing the suction force of lithium bromide of the absorbing liquid, as described below.

First, the flow of the heating cycle will be described with reference to FIG. The absorbing liquid (hereinafter referred to as “solution”) 2 a in the absorber 2 is sent to the regenerator 3 through the pipe 7 by the solution pump 5. In the regenerator 3, the sent solution is heated and separated into a high temperature and high pressure refrigerant vapor 3b and a concentrated solution 3a. The concentrated solution 3a is supplied to the pipe 8 by the solution spray pump 6.
And is returned to the absorber 2. On the other hand, the refrigerant vapor 3b generated in the regenerator 3 is sent to the heating heat exchanger 1 via the pipe 9.

In the heating heat exchanger 1, the refrigerant vapor 1a sent from the regenerator 3 and the supply hot water 10 exchange heat.
The supply hot water 10 exchanges heat with the refrigerant vapor 1a to become high-temperature hot water 11 and is supplied to an indoor fan coil unit (not shown) or the like. The refrigerant vapor 1a is condensed to become a liquid refrigerant 1b and drops into the lower portion 1c of the heating heat exchanger 1. This liquid refrigerant 1c is sent to the absorber 2 by the refrigerant pump 4 and mixed with the concentrated solution sent from the pipe 8 to become the solution 2a. The above is the flow of the heating cycle.

Next, the specific structure and operation of the heating extraction device, which is a feature of the present invention, will be described. The non-condensable gas generated during the heating operation accumulates in the vicinity of the heat transfer tube 12 of the heating heat exchanger 1, which is the place with the lowest pressure. The pipe 13 is branched from the discharge side pipe 7 of the solution pump 5, and a part of the solution is introduced to the extraction heat exchanger 14. In the extraction heat exchanger 14, a part of the supply hot water 10 and the solution are heat-exchanged to lower the temperature of the solution. This reduces the saturated vapor pressure of the solution.

The solution whose temperature has been lowered is introduced into the liquid flow down extraction device 16 through the pipe 15 and dropped inside the small container constituting the liquid flow down extraction device 16 so that the pressure in the liquid flow down extraction device 16 is increased. Lower. The non-condensable gas accumulated in the vicinity of the heat transfer tube 12 in the heating heat exchanger 1 is sucked into the liquid flow down extraction device 16 through the extraction pipe 17 due to the differential pressure. The non-condensable gas sucked into the liquid flow-type extraction device 16 is entrained in the solution at the solution drop portion 16 a and drops into the outlet pipe 18.

The non-condensed gas that has been drawn into the solution and dropped by the outlet pipe 18 of the liquid flow type extraction apparatus is the gas-liquid separator 1.
Enter 9. In the gas-liquid separator 19, the non-condensed gas is separated into the upper part, passes through the pipe 20, and enters the upper extraction tank 21. The solution separated by the gas-liquid separator 19 passes through the pipe 22 and returns to the heating cycle. In the extraction tank 21, when the non-condensable gas accumulates, the liquid surface 21a lowers, and the liquid surface 21a
When it is lowered to 9, the float switch 19a is activated to start removing the non-condensable gas.

First, the water solenoid valve 23 is opened and the water ejector 2 is opened.
Water flows to 4. After waiting for the water ejector 24 to fully operate and opening the extraction solenoid valve 25, the non-condensable gas in the extraction tank 21 is discharged into the water flowing in the ejector through the pipe 25a. When the non-condensed gas is discharged and the liquid level returns to the extraction tank 21 again, the float switch 21b in the extraction tank operates to close the extraction electromagnetic valve 25 and the water electromagnetic valve 23. By the series of operations described above, it is possible to automatically extract air during the heating operation.

As a control method in the bleeding device of this embodiment, the following bleeding operation system can be realized by setting the control device and the control circuit. (1) A system that constantly bleeds air while the chiller-heater is operating during heating operation. (2) A system that performs bleeding only during a fixed period of time during a heating operation, after the chiller-heater is activated, or after a certain period of time has elapsed since the chiller-heater was activated. (3) A system that performs bleeding at regular intervals while the water heater is operating during heating operation.

(4) A system for extracting air only during a fixed period of time from when the chiller-heater is operated during the heating operation. (5) A system that measures the outside air temperature during the heating operation, and extracts air when the outside air temperature is equal to or higher than the set temperature while the chiller-heater is operating. (6) A system that operates the air extraction device during the heating operation during the season set by the timer.

(7) A system for extracting air when the amount of heating used is less than a set amount during heating operation. (8) A system in which maintenance personnel or the like can arbitrarily extract air by operating a switch or the like when the water heater is operating.

According to this embodiment, there are the following effects. (1) Since the non-condensable gas generated in the refrigerator is automatically extracted during the heating operation of the chiller-heater, the cooling capacity due to the non-condensable gas does not decrease when switching from the heating operation to the cooling operation. .. (2) Since the artificial bleeding work is eliminated when switching from cooling to heating operation, the labor cost required for refrigerator operation is reduced.

(3) Since the factor of trouble when switching from the cooling operation to the heating operation is reduced, it is possible to dramatically improve the safety of automatic switching between the cooling operation and the heating operation. (4) Since the noncondensable gas can be extracted during the heating operation, metal corrosion due to the noncondensable gas in the refrigerator during the heating operation can be prevented. (5) Since it is possible to determine a failure such as an air leak or a solution abnormality by checking the number of times of bleeding during the heating operation, it is possible to perform appropriate maintenance before a failure stop.

[Embodiment 2] FIG. 2 is a system diagram of a heating cycle of an absorption chiller-heater according to another embodiment of the present invention.
In the figure, those having the same reference numerals as those in FIG. 1 are the same parts as those in the previous embodiment, and therefore their explanations are omitted. The embodiment of FIG. 2 differs from that of FIG. 1 in that the concentrated solution concentrated in the regenerator 3 is used as the solution introduced to the extraction heat exchanger 14. Figure 2
13A is a branch pipe connecting the concentrated solution pipe 8 on the discharge side of the solution spray pump 6 and the extraction heat exchanger 14.

The non-condensable gas generated during the heating operation accumulates in the vicinity of the heat transfer tube 12 of the heating heat exchanger 1, which is the place with the lowest pressure. From the outlet pipe of the solution spray pump 6 to the pipe 1
3A is branched, and a part of the concentrated solution is introduced to the extraction heat exchanger 14. In the extraction heat exchanger 14, a part of the supply hot water 10 and the solution are heat-exchanged to lower the temperature of the solution. This reduces the saturated vapor pressure of the solution.

The solution whose temperature has dropped is introduced into a liquid flow type extraction device 16 through a pipe 15 and dropped inside the liquid flow type extraction device 16 to reduce the pressure in the liquid flow type extraction device 16. The non-condensable gas accumulated in the vicinity of the heat transfer pipe 12 in the heating heat exchanger 1 passes through the extraction pipe 17 due to the differential pressure, and the liquid flow down type extraction device 1
It is sucked into 6. The non-condensable gas sucked into the liquid flow-type extraction device 16 is entrained in the solution at the solution drop portion 16 a and drops into the outlet pipe 18. The following is the same as the embodiment of FIG. According to the embodiment shown in FIG. 2, the same effect as that of the previous embodiment shown in FIG. 1 can be obtained.

[0028]

As described above in detail, according to the present invention, the non-condensable gas generated in the refrigerator during the heating operation is automatically extracted during the heating operation and is switched to the cooling operation. It is possible to provide an bleeder for an absorption chiller-heater that eliminates a decrease in capacity due to non-condensed gas.

[Brief description of drawings]

FIG. 1 is a system diagram of a heating cycle of an absorption chiller water heater according to an embodiment of the present invention.

FIG. 2 is a system diagram of a heating cycle of an absorption chiller-heater according to another embodiment of the present invention.

[Explanation of symbols] 1 heat exchanger for heating 2 absorber 3 regenerator 13, 13A branch pipe 14 heat exchanger for extraction air 16 liquid flow down type extraction device 17 extraction pipe 19 gas-liquid separator 21 extraction tank 23 water solenoid valve 24 Water ejector 25 Solenoid valve for extraction air

Claims (11)

[Claims] 1. An absorption chiller-heater having a function of switching between cooling and heating, at least a means for sucking non-condensable gas in a heat exchanger for heating by utilizing suction power of lithium bromide during heating operation. An extraction device for an absorption chiller-heater characterized by being provided. 2. In an absorption chiller-heater having a switching operation function between cooling and heating, a means for sucking the non-condensed gas in the heat exchanger for heating by utilizing the suction force of lithium bromide, and the suctioned non-condensed gas. A device that feeds condensed gas into the tank together with the absorbing liquid by using the entrainment action of the flowing down of the absorbing liquid, and a device that separates the non-condensing gas and the absorbing liquid sent into the tank and extracts and stores only the non-condensing gas And a device for removing the stored non-condensed gas to the outside of the refrigerator by means of a water ejector. 3. An absorption chiller-heater having a function of switching between cooling and heating, wherein a heat exchanger for extraction air for exchanging a part of the absorbing liquid with hot water and a non-condensing gas is drawn in using the absorbing liquid. Liquid-flow type extraction device to be entrained, gas-liquid separator for separating entrained non-condensable gas, extraction tank for storing separated non-condensable gas, liquid level switch for detecting the amount of accumulated non-condensable gas, non-condensing An extraction device for an absorption chiller-heater, comprising a water ejector and a solenoid valve for discharging gas to the outside of the refrigerator, and a piping system connecting them. 4. The absorption cold / hot temperature according to claim 3, wherein a branch pipe for guiding a part of the dilute solution fed from the absorber to the regenerator to the extraction heat exchanger is provided in the absorption cold / hot water generator. Water machine bleeding device. 5. The absorption cold water temperature according to claim 3, wherein a branch pipe for guiding a part of the concentrated solution to be fed from the regenerator to the absorber to the extraction heat exchanger is provided in the absorption cold water heater. Water machine bleeding device. 6. A control means for activating the bleeding device is provided either during heating operation, while the chiller-heater is operating, or after activating the chiller-heater for a certain period of time. An extraction device for an absorption chiller-heater according to any one of claims 1 to 5. 7. The extraction device for an absorption chiller-heater according to claim 6, wherein during the heating operation, the bleeder is extracted at regular intervals when the chiller-heater is operating. 8. The extraction device for an absorption chiller-heater according to claim 6, wherein the outside air temperature is measured during the heating operation, and the extraction is performed when the outside air temperature exceeds a set temperature. 9. The extraction device for an absorption chiller-heater according to claim 6, wherein during the heating operation, extraction is performed when the heating usage amount becomes smaller than a set amount. 10. The bleeder for an absorption chiller-heater according to claim 1, further comprising a control means for operating the bleeder during the heating operation during the season set by the timer. 11. The bleeder for an absorption chiller-heater according to claim 6, wherein bleeding is arbitrarily performed by a switch operation when the chiller-heater is operating during heating operation.