JP2003329329A - Triple effect absorption type refrigerating machine - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a downsized triple effect absorption type refrigerating machine wherein reliability is secured and partial load efficiency is improved. <P>SOLUTION: This triple effect absorption type refrigerating machine is provided with: a high-temperature regenerator 1; a middle-temperature regenerator 2; a low-temperature regenerator 3; a condenser 4; an absorber 6; an evaporator 5; a plurality of heat exchangers 8, 9 and 10; solution pipes 26, 31 and 35 for connecting them; and solution pumps 7 and 35 or a refrigerant pump 55 for circulating a solution or a refrigerant in a cycle. A housing 15 for forming a solution level is installed at the exit part of the high-temperature regenerator. A float valve 16 for adjusting a solution amount fed to the high-temperature regenerator depending on the solution level of the solution surface is mounted in the housing 15. <P>COPYRIGHT: (C)2004,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a triple effect absorption refrigerator used as a heat source device for an air conditioner or the like.

[0002]

2. Description of the Related Art As a conventional technique relating to a triple-effect absorption refrigerating machine, for example, one described in JP-A-2000-171123 can be mentioned. In this conventional technology, the high temperature regenerator, the medium temperature regenerator and the low temperature regenerator, the condenser, the absorber, the heat exchangers, the solution pump, the refrigerant pump, etc. are the main constituent devices, and these devices are the solution piping, the refrigerant piping, etc. It is configured to connect. A pressure sensor is provided in the high temperature regenerator, and a liquid level sensor is provided at the outlet of the high temperature regenerator. Based on the output of the pressure sensor, the basic rotation speed of the solution pump that sends the solution from the absorber to the high temperature regenerator is set. A rotation speed control device for correcting the rotation speed of the solution pump according to the liquid level detected by the liquid level sensor is provided, and the rotation speed control device corrects the set rotation speed of the solution pump. .

Further, the liquid level sensor acts as a high level liquid switch and a low level liquid level switch, and the rotation speed set by the rotation speed control device is corrected downward when the liquid level switch detects a high liquid level, It was configured to correct upward when it detected a low surface. Furthermore, the medium temperature regenerator is equipped with a liquid level switch at its outlet and a solution valve in the dilute solution inflow pipe or the concentrated solution outflow pipe, so that the medium temperature regenerator is detected when the liquid level switch detects the liquid level high level. It has a control mechanism for controlling the solution valve so as to reduce the flow rate of the dilute solution sent to the medium temperature increase device or increase the outflow amount of the concentrated solution flowing out from the medium temperature regenerator (prior art 1).

Further, as another conventional technique, Japanese Patent Application Laid-Open No. 10-29200 is available.
An absorption refrigerator described in Japanese Patent Publication No. 9706 is cited.
In the conventional technology, in the double-effect absorption refrigerator, a float valve for adjusting the flow rate of the solution sent to the high temperature regenerator and the low temperature regenerator is provided at the outlet of the high temperature regenerator according to the liquid level of the outlet. ing. Further, a control device for the solution pump is provided, and control is performed so that the solution pump is soft-started (prior art 2).

[0005]

A conventional triple-effect absorption refrigerating machine has a high temperature from the absorber based on the output of the pressure sensor of the high temperature regenerator, as described in JP-A-2000-171123. The basic rotation speed of the solution pump for feeding the solution to the regenerator is set, and further, the set rotation speed is controlled to be corrected by a liquid level sensor provided at the outlet of the high temperature regenerator. Therefore, the control rule becomes complicated. In addition, it is not easy to follow a sudden change in the liquid level due to a rapid change in the state immediately after the heat input to the high temperature regenerator is started or immediately after the heat is stopped. Furthermore, if the high-temperature regenerator is a through-flow type (so-called convection in which no convection of the solution occurs in the vessel, or a so-called flowing method) or a full-fill type, the outlet liquid level changes as the void ratio changes in the high temperature regenerator. Fluctuates. Since the basic rotation speed of the solution pump is corrected by this variation, the solution circulation amount in the rated operating state changes before and after this correction, and it may be difficult to reproduce a cycle with a predetermined performance.

Further, in the above-mentioned prior art, since the basic rotation speed of the solution pump is corrected by the change of the outlet liquid level of the high temperature regenerator, the flow rate of the solution supplied to the low temperature regenerator is also changed accordingly. Was there. Therefore, when the outlet liquid level of the high temperature regenerator rises and the basic rotation speed of the solution pump is corrected downward, the flow rate of the solution supplied to the low temperature regenerator also decreases, and the refrigerant vapor that heats the low temperature regenerator is reduced. The pressure, that is, the pressure of the medium temperature regenerator will increase. Along with this, the pressure of the high temperature regenerator also rises, so that the solution outflow amount from the high temperature regenerator to the absorber increases. At this time, in the high temperature regenerator, the inflow rate decreased by lowering the basic rotation speed of the solution pump and the outflow rate increased by the increase in the high temperature regenerator pressure. The surface drops sharply. Therefore, if the basic rotation speed of the solution pump is corrected upward, a phenomenon completely opposite to the above-described operation occurs, and the cycle becomes unstable by repeating these operations.

Further, in order to prevent the above-mentioned problems of the prior art, it is necessary to adopt a control rule considering dynamic characteristics such as pressure change in the cycle and void ratio in each regenerator. Therefore, the control rule becomes complicated, and it becomes necessary to set different control parameters for each model.
In addition, absorption type refrigerators use canned pumps for solution and refrigerant pumps because the casing is a closed container.In this type of pump, the working fluid is generally used to lubricate and cool the bearings. Is self-circulating. Therefore, a lower limit is set for the rotation speed and the power supply frequency of the solution pump, and the pump is always operated so as to be equal to or higher than the lower limit.

Further, in the above-mentioned prior art, when the high temperature regenerator pressure is low, such as immediately after the start of the refrigerator, when the cooling load is small, or when the cooling water temperature is low, the high temperature regenerator sends it to the absorber. When the amount of the solution to be supplied decreases, the solution supplied to the high temperature regenerator becomes excessive even when the solution pump is operated at the above lower limit value. Further, in the above-mentioned prior art, since the refrigerant vapor and the concentrated solution are separated in the upper part of the high temperature regenerator body, and the liquid level detection tank is separately provided at the outlet of the high temperature regenerator, the gas-liquid separation performance is maintained. Therefore, it is difficult to downsize the high temperature regenerator body.

Next, in the absorption chiller described in JP-A-10-9706, since the double-effect absorption refrigeration cycle is adopted, the coefficient of performance is low. Further, it is assumed that the total head of the solution pump is about 9 to 15 m used for the double effect absorption refrigeration cycle, and the total head used for the triple effect is about 30 m, or a solution pump having a length of more than 30 m is not considered. . For this reason, the solution pump was operating at a constant speed during normal operation except at startup. Therefore,
When this conventional technology is applied to a triple effect cycle, the pressure difference before and after the float valve becomes larger than that in the double effect cycle, resulting in severe wear of the bearing, which results in increased shaft leakage and reduced cooling efficiency. In addition, there is a risk of causing troubles such as the trouble of the bearing being astringent due to inclusion of foreign matter or pinching.

An object of the present invention is to provide a triple-effect absorption refrigerating machine in which cycle stability is ensured. Another object of the present invention is to provide a triple-effect absorption refrigerator with improved partial load efficiency. Further, the object of the present invention is to
It is to create a triple-effect absorption refrigerator that can be downsized. Further object of the present invention, when adjusting only the supply amount to the high temperature regenerator, cooling capacity, the amount of solution in the absorber is stable, triple effect absorption refrigeration that can prevent problems related to instability phenomenon. To provide a machine.

[0011]

In order to achieve the above object, a triple effect absorption refrigerator according to the present invention comprises a high temperature regenerator,
Medium temperature regenerator and low temperature regenerator, condenser, absorber, evaporator,
In a triple-effect absorption refrigerating machine having a plurality of heat exchangers, a solution pipe and a refrigerant pipe connecting these devices, a solution pump or a refrigerant pump for circulating a solution and a refrigerant in a cycle, a liquid level is provided at the high temperature regenerator outlet. A housing to be formed is provided, and a float valve for adjusting the amount of the solution sent to the high temperature regenerator is provided in the housing by the liquid level of the liquid surface.

As a result, the rotational speed of the solution pump and the control rule for the solution valve are unnecessary, and problems related to the control rule can be prevented, so that the reliability and cost of the triple effect absorption refrigerator can be improved. . Further, since the followability with respect to the fluctuation of the liquid level is improved, it is possible to prevent the trouble caused by the excessive rise and fall of the liquid level, and the reliability is further improved. Furthermore, since the relationship between the state in the cycle such as pressure and liquid level and the amount of solution sent to each regenerator is always constant, the reproducibility of cycle state quantity such as performance is good, so it is also possible to stabilize the performance. , Reliability is improved.

Further, since the amount of the solution sent to the medium temperature regenerator and the low temperature regenerator is not directly influenced by the pressure and the liquid level of the high temperature regenerator, the liquid level at the outlet of the high temperature regenerator changes rapidly. Even so, the amount of solution sent to the medium temperature regenerator and the low temperature regenerator and the pressure in these vessels are relatively stable.
Therefore, the reliability is also improved by stabilizing the amount of solution sent to the absorber, the cooling capacity, the heating capacity during the heating operation, and the like.

Further, when the amount of the solution sent to the high temperature regenerator is adjusted by the float valve, the amount of the solution sent to the high temperature regenerator is irrespective of the driving power frequency for driving the solution pump even under the condition that the temperature of the high temperature regenerator is low. Is not excessive,
There is no need to adjust the power frequency. In addition, even when adjusting the power supply frequency to improve partial load efficiency and reduce power consumption, it is possible to always operate at a frequency above a certain value, and lubrication and cooling of the bearing due to the amount of self-circulating liquid in the pump. It can be performed. Therefore, the reliability of the solution pump can be improved and the reliability of the entire refrigerator can be improved by expanding the operating range of the triple-effect absorption refrigerator to the condition where the high temperature regenerator pressure is low.

In order to achieve the above object, another invention of the triple effect absorption refrigerator according to the present invention is a high temperature regenerator, a medium temperature regenerator and a low temperature regenerator, a condenser, an absorber, an evaporator and a plurality of regenerators. A heat exchanger, a solution pipe and a refrigerant pipe connecting these devices, a solution pump or a refrigerant pump for circulating a solution and a refrigerant in a cycle, and from the absorber in parallel with the high temperature regenerator, the medium temperature regenerator and the low temperature regenerator. In the triple-effect absorption refrigerator in which the solution pipe is connected so that a solution is sent, a housing that forms a liquid surface at the outlet of the high temperature regenerator is provided, and the liquid surface is detected in the housing. A float valve for adjusting the amount of solution sent to the high temperature regenerator based on the detected liquid level is provided, and a solution pipe for sending the solution to the medium temperature regenerator and the low temperature regenerator has the float valve and the high temperature regeneration. With vessels It is connected to a solution pipe between.

As a result, the rotational speed of the solution pump and the control rule of the solution valve are not required, the followability to the liquid level fluctuation is improved, the reproducibility of the cycle state quantity is good, and the self-circulating liquid quantity of the solution pump can be secured. Therefore, performance stability, reliability improvement, and expansion of the operating range can be achieved. Further, since the amount of the solution sent to the medium temperature regenerator and the low temperature regenerator is adjusted in association with the high temperature regenerator, the partial load efficiency becomes good.

In order to achieve the above object, still another invention of the triple effect absorption refrigerator according to the present invention is a high temperature regenerator, a medium temperature regenerator and a low temperature regenerator, a condenser, an absorber, an evaporator, a low temperature regenerator. A plurality of heat exchangers including a heat exchanger and an intermediate temperature heat exchanger, a solution pipe and a refrigerant pipe connecting these devices, a solution pump or a refrigerant pump for circulating a solution and a refrigerant in a cycle, and the solution pipe is a dilute solution. Is sent from the absorber to the low temperature heat exchanger and then branched, part of the diluted solution after branching is sent to the low temperature regenerator, and the remaining dilute solution passes through the medium temperature heat exchanger to the high temperature regenerator and medium temperature regenerator. In a triple-effect absorption refrigerator connected so as to be sent to, between the low temperature heat exchanger and the high temperature regenerator, a flow rate for adjusting the amount of solution sent from the absorber to the high temperature regenerator and the medium temperature regenerator. Adjustment means are provided.

In order to achieve the above object, still another invention of a triple effect absorption refrigerator according to the present invention is a high temperature regenerator, a medium temperature regenerator and a low temperature regenerator, a condenser, an absorber, an evaporator, and a plurality of regenerators. Heat exchanger, a solution pipe and a refrigerant pipe connecting these devices, a solution pump or a refrigerant pump for circulating a solution and a refrigerant in a cycle, and a triple effect absorption refrigeration equipped with a gas-liquid separator at the outlet of the high temperature regenerator. In the machine, liquid level detection means is provided inside the gas-liquid separator, and the liquid level detection means is provided with flow rate adjustment means for adjusting the amount of solution sent to the high temperature regenerator according to the detected liquid level. Has been.

As a result, it is not necessary to provide a tank dedicated to the liquid level detection, and the high temperature regenerator body and the triple effect absorption refrigerator are downsized. Specifically, the solution pump that sends the solution from the absorber to the high-temperature regenerator, the medium-temperature regenerator, or the low-temperature regenerator controls the frequency of the drive power source that drives the solution pump according to the pressure or temperature of the high-temperature regenerator. A controller is provided. This allows
Since the pressure difference before and after the float valve can be reduced, it is possible to prevent bearing wear and problems associated therewith, and improve the reliability of the triple effect absorption refrigerator. Further, the power consumption is reduced and the impact pressure of the solution heat exchanger at the time of starting the pump is reduced, so that the strength life due to the repeated stress generation can be extended.

Further, in all the above-mentioned solution means,
Since the absorption refrigeration cycle uses a triple effect cycle, it has a high coefficient of performance and saves energy in the absorption refrigerator.

[0021]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a cycle system diagram of a triple-effect absorption refrigerator according to an embodiment of the present invention, which is a so-called parallel flow system in which a dilute solution is flown in parallel to a high temperature regenerator to a medium temperature regenerator, a low temperature regenerator, etc. Is. The triple effect absorption refrigerator includes a high temperature regenerator 1, a gas-liquid separator 15, a medium temperature regenerator 2, a low temperature regenerator 3, a condenser 4, an evaporator 5, a refrigerant pump 55, an absorber 6, a dilute solution pump 7, It comprises a low temperature heat exchanger 8, a concentrated solution pump 85, a medium temperature heat exchanger 9, a high temperature heat exchanger 10, and a solution pipe and a refrigerant pipe connecting these devices. In this embodiment, water is used as the refrigerant of the refrigerator and an aqueous lithium bromide solution is used as the absorbent.

Next, the operation of the refrigerator during operation will be described. The cold water used for cooling is cooled by the heat of vaporization of the refrigerant in the evaporator 5 and sent to the cooling load system from the pipe 5a. The refrigerant vapor generated at this time is absorbed by the solution in the absorber 6. Due to this absorption, the pressure inside the evaporator and the evaporation temperature are maintained at low pressure and low temperature. In the absorber 6, the solution that has been heated and concentrated in each of the high temperature regenerator 1, the medium temperature regenerator 2, and the low temperature regenerator 3, that is, a concentrated solution is sprayed. The sprayed concentrated solution is cooled by the cooling water flowing through the pipe 6a of the absorber 6 and absorbs the refrigerant vapor, and becomes a solution having a lower concentration, that is, a dilute solution and stays in the lower portion of the absorber 6. This dilute solution is sent to the low temperature heat exchanger 8 by the dilute solution pump 7, exchanges heat with the concentrated solution flowing into the absorber 6 to raise the temperature, and then branches into two systems, one of which is the low temperature regenerator 3
The other is sent to the medium temperature heat exchanger 9.

The dilute solution sent to the low-temperature regenerator 3 is heated and concentrated by the heat of condensation of the refrigerant vapor generated in the medium-temperature regenerator 2 and the sensible heat of the refrigerant used for heating the medium-temperature regenerator 2 and concentrated. A concentrated solution, that is, a concentrated solution is obtained. This concentrated solution merges with the concentrated solution from the high temperature regenerator 1 and the medium temperature regenerator 2 through the pipe 35, and by the concentrated solution pump 85,
It is sent to the absorber 6 via the low temperature heat exchanger 8. Further, the refrigerant vapor generated in the low temperature regenerator 3 is the pipe 6 a of the condenser 4.
It is cooled by the cooling water flowing through it and condenses, and the intermediate temperature regenerator 2
Is sent to the evaporator 5 together with the condensed refrigerant used for heating and the condensed refrigerant used for heating the low temperature regenerator 3.

On the other hand, the dilute solution sent to the medium temperature heat exchanger 9 exchanges heat with the concentrated solution from the high temperature regenerator 1 and the medium temperature regenerator 2 to further raise the temperature, and then branches into two systems again. Is sent to the medium temperature regenerator 2 and the other is sent to the high temperature regenerator 1 via the high temperature heat exchanger 10.

The dilute solution sent to the medium temperature regenerator 2 is heated and concentrated by the heat of condensation of the refrigerant vapor generated in the high temperature regenerator 3 to become a concentrated solution, and overflows into the float box 24. A float valve 25 is installed in the float box 24, and the float valve 25 serves as a flow rate adjusting means for adjusting the amount of the dilute solution sent to the intermediate temperature regenerator 2 according to the liquid level of the concentrated solution in the float box 24. ing. The concentrated solution in the float box 24 is the concentrated solution pipe 2
6 to join the concentrated solution from the high temperature regenerator 1 to be sent to the high temperature side pipe of the medium temperature heat exchanger 9, and join the concentrated solution from the low temperature regenerator 3 from the outlet side of the intermediate temperature heat exchanger 9. Sent for.

The refrigerant used for heating the medium temperature regenerator 2 and condensed in the pipe is sent to the low temperature regenerator 3, and the solution in the low temperature regenerator 3 is heated by sensible heat and then sent to the condenser 4. Further, the refrigerant vapor generated in the medium temperature regenerator 2 is sent to the low temperature regenerator 3 where the dilute solution flowing into the low temperature regenerator 3 is heated and concentrated.

On the other hand, the solution sent to the high temperature regenerator 1 side is
After exchanging heat with the concentrated solution flowing out from the high temperature regenerator 1 in the high temperature heat exchanger 10, the flow rate is adjusted by the float valve 16 installed in the gas-liquid separator 15, and then the high temperature regeneration is performed from the inlet header 11 side. Flows into vessel 1. The high temperature regenerator 1 is a flow-through type, and the high temperature regenerator 1 is composed of a burner 12 for burning fuel, a heat transfer tube group arranged concentrically around the burner 12 for heating and concentrating a solution, and the like. ing.

The dilute solution that has flowed into the high temperature regenerator 1 is heated and concentrated by the radiation heat from the burner 12 and the heat transfer from the combustion gas to become a concentrated solution. It is sent to the gas-liquid separator 15. The gas-liquid separator 15 is installed at the outlet (downstream) of the high temperature regenerator 1, and the inside thereof is composed of a bottom portion where a solution obtained by separating the refrigerant vapor, that is, a concentrated solution, and an upper portion which forms a space. A float valve 16 is installed inside the gas-liquid separator 15, and the float valve 16 is the amount of the dilute solution sent to the high temperature regenerator 1 depending on the liquid level height (liquid level) of the concentrated solution at the bottom as described above. Is being adjusted.

The concentrated solution separated from the refrigerant vapor in the gas-liquid separator 15 is sent to the high temperature heat exchanger 10 and exchanges heat with the dilute solution flowing into the high temperature regenerator 1 to lower the temperature, and then the medium temperature regenerator 2 The solution is combined with the concentrated solution produced by being heated and concentrated in (1), and then sent to the intermediate temperature heat exchanger (9). The refrigerant vapor separated from the concentrated solution in the gas-liquid separator 15 is sent to the medium temperature regenerator 2 to heat and concentrate the dilute solution in the medium temperature regenerator 2 and condense in the pipe, and then further passes through the low temperature regenerator 3. Is sent to the condenser 4. The refrigerant flowing into the condenser 4 and condensed in the pipe is further sent to the evaporator 5 together with the refrigerant condensed in the low temperature regenerator 3 and the condenser 4.

As described above, according to this embodiment,
At the outlet (downstream) of the high temperature regenerator 1, a gas-liquid separator 15 composed of a housing is provided, and the amount of the solution to the high temperature regenerator 1 depends on the liquid level of the solution that remains at the bottom of the gas-liquid separator 15. Since the float valve 16 for adjusting the
The control rule for the frequency of the drive power source for driving the motor, the control valve, etc. is unnecessary, and problems related to complicated control rules are prevented.

Further, the operation followability of the float valve 16 with respect to the fluctuation of the liquid level in the gas-liquid separator 15 is very good, and the gas-liquid separation failure due to the excessive fluctuation of the liquid level can be prevented. Further, since the relationship between the liquid level and the valve opening, that is, the parameter relating to the flow rate adjustment is always constant, the reproducibility of the state quantity such as the performance and the pressure in the container is good.

Further, the operation of the float valve 16 for adjusting the amount of the solution sent to the high temperature regenerator 1 is performed by the diluted solution pump 7
As compared with the case where the entire solution circulation amount is controlled by controlling the frequency of the driving power source that drives the cooling power source, the flow rate of the solution flowing into the medium temperature regenerator 2 and the low temperature regenerator 3 is hardly affected, and thus the refrigeration cycle The operation is stable, and hunting of performance and the like and troubles due to uneven distribution of the solution in the absorber 6 or each regenerator are prevented.

Further, since the float valve 16 which is the liquid level detecting means at the outlet of the high temperature regenerator 1 is installed inside the gas-liquid separator 15, it is not necessary to provide a tank or the like dedicated to the liquid level detection, and the high temperature regeneration is performed. It is possible to reduce the size of the container 1 and the absorption refrigerator as a whole.

Incidentally, in the present embodiment, the medium temperature regenerator 1
The float valve 25 provided at the outlet of the is connected by piping so as to adjust only the amount of the dilute solution sent to the intermediate temperature regenerator 2. This is the high temperature regeneration described in Japanese Patent Laid-Open No. 10-9706. The flow rate of the dilute solution sent to the two regenerators, the medium temperature regenerator 2 and the low temperature regenerator 3, may be adjusted like a float valve provided in the reactor. In this case, the amount of the dilute solution sent to the low temperature regenerator 3 can be reduced at the time of partial load operation and the like, instead of making the pipe connection complicated, so that the partial load efficiency is improved.

Next, another embodiment of the present invention will be described.
This will be described with reference to FIG. The basic constituent elements of the triple effect absorption refrigerator shown in FIG. 2 are the same as those of the embodiment shown in FIG. 1 is different from the embodiment of FIG. 1 in that the solution pipe between the float valve 16 and the inlet header 11 of the high temperature regenerator 1 sends the solution to the low temperature regenerator 3 and the solution to the medium temperature regenerator 2. That is, the solution pipe 21 for sending is branched and connected.

In the present embodiment, the dilute solution from the absorber 6 via the dilute solution pump 7 and the low temperature heat exchanger 8 is floated directly in the gas-liquid separator 15 at the outlet of the high temperature regenerator 1. It is sent to the valve 16 and the flow rate is adjusted based on the liquid level of the concentrated solution in the gas-liquid separator 15. After that, the dilute solution is branched into two systems, one of which is sent to the low temperature regenerator 3 through the solution pipe 31 and the other of which is sent to the intermediate temperature heat exchanger 9.

The dilute solution is heated in the medium temperature heat exchanger 9 to the high temperature regenerator 1.
After exchanging heat with the high-temperature concentrated solution returning from the temperature rises, the temperature is raised, and then the system is branched into two systems, one is sent to the medium temperature regenerator 2 through the solution pipe 21, and the other is passed through the high temperature heat exchanger 10. And sent to the inlet header 11 of the high temperature regenerator 1. Since the flow rate of the dilute solution sent to the medium temperature regenerator 2 is adjusted by the float valve 16 provided in the gas-liquid separator 15, the float valve is not required at the outlet of the medium temperature regenerator 2.

According to this embodiment, the amount of the dilute solution sent to the high temperature regenerator 1, the intermediate temperature regenerator 2 and the low temperature regenerator 3 by the single float valve 16 provided at the outlet of the high temperature regenerator 1. Has been adjusted. For this reason, the stability of the cycle state and the liquid surface at the outlet of the intermediate temperature regenerator 2 is lowered. However, instead, the amount of the dilute solution sent to the low temperature regenerator 3 can be reduced during the partial load operation or the like, and the partial load efficiency is improved. Further, since the float valve is not required in the medium temperature regenerator 2, the medium temperature regenerator 2 can be downsized.

Next, still another embodiment of the present invention will be described with reference to FIG. The basic components of the triple effect absorption refrigerator shown in FIG. 3 are the same as those of the embodiment shown in FIG. That is, in the present embodiment, the dilute solution is branched from the absorber 6 into two systems via the dilute solution pump 7 and the low temperature heat exchanger 8, one to the low temperature regenerator 3 and the other to the medium temperature heat exchanger 9. The configuration sent is similar to the embodiment of FIG. But,
Unlike the embodiment shown in FIG. 1, the hot concentrated solution and the diluted solution whose temperature has risen, which are returned from the high temperature regenerator 1 in the medium temperature heat exchanger 9, are directly sent to the float valve 16 of the high temperature regenerator 1 to be vapor-liquid. The flow rate is adjusted based on the liquid level of the concentrated solution in the separator 15. After that, the dilute solution is branched into two systems, one is sent to the medium temperature regenerator 2 and the other is sent to the inlet header 11 of the high temperature regenerator 1 via the high temperature heat exchanger 10.

According to the present embodiment, since the amount of the dilute solution sent to the low temperature regenerator 3 is substantially constant, the low temperature regenerator is inferior to the embodiment of FIG. 2 in terms of partial load efficiency. Refrigerant vapor pressure in 3 and condenser 4 stabilizes. Therefore, the operation of the entire low pressure side of the cycle including the evaporator 5 and the absorber 6 is stabilized. Therefore, it is possible to avoid problems such as hunting of the cooling capacity and fluctuations in the amount of solution in the absorber, and enlargement of the device due to measures against this problem.

With respect to still another embodiment of the present invention,
This will be described with reference to FIG. The basic components of the triple effect absorption refrigerator shown in FIG. 4 are the same as those of the embodiment shown in FIG. The present embodiment differs from the embodiment of FIG. 1 in that the control device 72 controlled by the inverter 73 and the like in the embodiment of FIG.
Is installed. However, also in the embodiments of FIGS. 2 and 3, the control device 72 similarly controlled by the inverter 73 and the like can be installed.

In the present embodiment, the pressure of the high temperature regenerator 1 is measured by the pressure sensor 71 as shown in FIG.
The frequency of the drive power source for driving the dilute solution pump 7 and the concentrated solution pump 85 is controlled based on the measured signal. According to the present embodiment, the driving power supply frequency is brought closer to the minimum required value to reduce the power consumption and the amount of the solution sent to the low temperature regenerator 3 is reduced, thereby improving the partial load efficiency. It will be possible.

Further, float valves 16 and 25 for adjusting the amount of dilute solution sent to the high temperature regenerator 1 and the medium temperature regenerator 2.
As a result, the dilute solution pump 7 is always operated at a rotation speed above a certain value. By constantly rotating the dilute solution pump 7 at a rotation speed equal to or higher than a certain value, the amount of the self-circulating liquid of the dilute solution pump 7 is secured, and therefore the reliability of the pump bearing is secured, and compared with the case where the float valve is not used. The operating range is expanded.

Further, since the frequency of the drive power source is brought close to the minimum required value, the pressure difference between the front and rear of the float valve 16 and the float valve 25 becomes small, and the bearing wear and bearing wear of the float valves 16 and 25 are reduced. It is possible to prevent troubles due to an increase in shaft leakage, a decrease in cooling efficiency, inclusion of foreign matter, and pinching. As the input signal for controlling the inverter, the same effect can be obtained by using the temperature of the high temperature regenerator, the pressure or temperature of the medium temperature regenerator, or a signal combining these in addition to the high temperature regenerator pressure.

[0045]

As described above, according to the triple effect absorption refrigerating machine of the present invention, the response of adjusting the flow rate of the dilute solution is improved with respect to the fluctuation of the liquid level of the concentrated solution in the gas-liquid separator, resulting in an excessive value. The stability of the cycle is ensured, which prevents problems caused by various liquid level fluctuations.

Further, according to the triple effect absorption refrigerator of the present invention, the flow rate of the solution sent to the medium temperature regenerator and the low temperature regenerator is adjusted in conjunction with the high temperature regenerator, so that the partial load efficiency is improved.

Further, according to the triple-effect absorption refrigerator of the present invention, it is not necessary to separately provide a liquid level detection tank at the outlet of the high temperature regenerator, so that the size can be reduced.

Further, according to the triple-effect absorption refrigerator of the present invention, when only the amount of the solution sent to the high temperature regenerator is adjusted, the cooling capacity, the amount of the solution in the absorber, etc. are stable, resulting in an unstable phenomenon. It is possible to prevent related problems.

[Brief description of drawings]

FIG. 1 is a system diagram of a triple effect absorption refrigerator according to an embodiment of the present invention.

FIG. 2 is a system diagram of a triple-effect absorption refrigerator according to another embodiment of the present invention.

FIG. 3 is a system diagram of a triple-effect absorption refrigerator according to still another embodiment of the present invention.

FIG. 4 is a system diagram of a triple-effect absorption refrigerator according to still another embodiment of the present invention.

[Explanation of symbols]

1 ... High temperature regenerator, 2 ... Medium temperature regenerator, 3 ... Low temperature regenerator, 4
... condenser, 5 ... evaporator, 6 ... absorber, 7 ... dilute solution pump, 8 ... low temperature heat exchanger, 9 ... medium temperature heat exchanger, 10 ... high temperature heat exchanger, 11 ... high temperature regenerator inlet header, 15 ... Gas-liquid separator, 16, 25 ... Float valve, 21 ... Solution piping to medium temperature regenerator, 24 ... Float box, 26, 35 ...
Concentrated solution pipe, 31 ... Solution pipe to low temperature regenerator, 55 ... Refrigerant pump, 71 ... Pressure sensor, 72 ... Control device, 73 ...
Inverter, 85 ... Concentrated solution pump.

Continued front page    (72) Inventor Akira Nishiguchi             502 Kintatemachi, Tsuchiura City, Ibaraki Japan             Tate Seisakusho Mechanical Research Center (72) Inventor Hitoshi Matsushima             502 Kintatemachi, Tsuchiura City, Ibaraki Japan             Tate Seisakusho Mechanical Research Center (72) Inventor Nobuyuki Takeda             4-13 Nakagawa Adachi-ku, Tokyo Stock Exchange             Inside Hitachi Industries F term (reference) 3L093 BB16 BB22 BB29 BB36 BB37                       BB48 CC00 DD08 EE25 GG01                       GG02 GG04 HH02 HH15 JJ02                       JJ06 KK03

Claims (5)

[Claims] 1. A high temperature regenerator, a medium temperature regenerator and a low temperature regenerator,
A condenser, an absorber, an evaporator, a plurality of heat exchangers, a solution pipe and a refrigerant pipe connecting these devices, a triple-effect absorption refrigerator having a solution pump or a refrigerant pump for circulating a solution and a refrigerant in a cycle, A housing for forming a liquid level is provided at the outlet of the high temperature regenerator, and a float valve for adjusting the amount of the solution sent to the high temperature regenerator according to the liquid level of the liquid level is provided in the housing. A triple effect absorption refrigerator. 2. A high temperature regenerator, a medium temperature regenerator and a low temperature regenerator,
A condenser, an absorber, an evaporator, a plurality of heat exchangers, a solution pipe and a refrigerant pipe connecting these devices, a solution pump or a refrigerant pump for circulating a solution and a refrigerant in a cycle, and the absorber to the high temperature regenerator. A triple effect absorption refrigerator in which the solution pipe is connected so that the solution is sent in parallel to the medium-temperature regenerator and the low-temperature regenerator, wherein a housing for forming a liquid surface is provided at the outlet of the high-temperature regenerator, A float valve that detects the liquid level and adjusts the amount of solution sent to the high temperature regenerator based on the detected liquid level is provided in the housing, and the solution that sends the solution to the medium temperature regenerator and the low temperature regenerator is provided. A triple effect absorption refrigerator, wherein a pipe is connected to a solution pipe between the float valve and the high temperature regenerator. 3. A high temperature regenerator, a medium temperature regenerator and a low temperature regenerator,
A plurality of heat exchangers including a condenser, an absorber, an evaporator, a low temperature heat exchanger and a medium temperature heat exchanger, a solution pipe and a refrigerant pipe connecting these devices, a solution pump or a refrigerant pump for circulating a solution and a refrigerant in a cycle. The solution pipe is branched after the dilute solution is sent from the absorber to the low temperature heat exchanger, a part of the dilute solution after the branch is sent to the low temperature regenerator, and the remaining dilute solution is subjected to medium temperature heat exchange. A triple-effect absorption refrigerating machine connected so as to be sent to a high-temperature regenerator and a medium-temperature regenerator via a reactor, between the low-temperature heat exchanger and the high-temperature regenerator, the high-temperature regenerator and the medium-temperature regeneration from the absorber A triple-effect absorption refrigerating machine, which is provided with flow rate adjusting means for adjusting the amount of solution sent to the container. 4. A high temperature regenerator, a medium temperature regenerator and a low temperature regenerator,
A condenser, an absorber, an evaporator, a plurality of heat exchangers, a solution pipe and a refrigerant pipe that connect these devices, a solution pump or a refrigerant pump that circulates a solution and a refrigerant in a cycle, and a gas-liquid at the outlet of the high temperature regenerator. In a triple-effect absorption refrigerator having a separator, a liquid level detecting means is provided inside the gas-liquid separator, and the liquid level detecting means sends the liquid level to the high temperature regenerator according to the detected liquid level. A triple-effect absorption refrigerator, which is provided with a flow rate adjusting means for adjusting the amount of solution. 5. The solution pump that feeds the solution from the absorber to the high temperature regenerator, the medium temperature regenerator or the low temperature regenerator is supplied with a frequency of a driving power source that drives the solution pump according to the pressure or temperature of the high temperature regenerator. The triple effect absorption refrigerating machine according to claim 1, further comprising a control device for controlling.