JPH07190541A - Absorption type refrigerator - Google Patents

Abstract

PURPOSE:To make an optimum control of a refrigerating capacity easy according to an usage condition by regulating the refrigerating capacity through controlling a flow quantity of a low concentration absorption liquid having absorbed a refrigerant or that of the refrigerant by an electric current quantity to an electromagnetic proportion valve. CONSTITUTION:A liquidized refrigerant in a condenser 6 is fed to an evaporator 5 during a control of a flow quantity according to a required refrigerating capacity by an electromagnetic proportion control valve 100 through a feeding path 18. An inside of the evaporator 5 is of a vacuum state, and the refrigerant dissemunated on a cooled coil 24 evapoates in a moment and robs the coil 24 of a heat of evaporation and a cooling is executed. As an evaporated refrigerant is absorbed in a high concentration absorption liquid, the inside of the evaporator 5 is maintained in a low pressure state. As heat is generated at this absorption time, the cooled coil 24 is arranged in an absorber 4, the generated heat is discharged to an outside and absorption is made to continue. An absorbed liquid having absorbed the refrigerant and having become a state of a low concentration is made to circulate to a high temperature regenerator 1. At this time, a flow quantity of a low concentration absorption liquid. which returns is allowed to the optimum control according to the required refrigerating capacity which is set by the electromagnetic proportion control valve 100.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an absorption refrigerating machine capable of appropriately controlling refrigerating capacity.

[0002]

2. Description of the Related Art The refrigerating capacity of a conventional absorption refrigerating machine is adjusted by providing an opening / closing valve in a supply path of a refrigerant liquid or an absorbing liquid absorbing the refrigerant liquid. It was difficult to precisely control the refrigeration capacity.

[0003]

However, when an absorption refrigerator is used for air conditioning in a room, the need for precise control of the refrigerating capacity is increasing from the viewpoint of reducing fuel consumption and comfortable use. An object of the present invention is to provide an absorption refrigerator that can easily control the appropriateness of the refrigerating capacity according to usage conditions.

[0004]

In the absorption refrigerator of the present invention, a regenerator for boiling a low-concentration absorption liquid containing a refrigerant,
A gas-liquid separator that separates the boiling absorption liquid into a refrigerant vapor and a high-concentration absorption liquid, a condenser that condenses the separated refrigerant vapor, and a vaporization heat of the liquid-phase refrigerant condensed in the condenser to cool the cooling target. An evaporator for cooling and an absorber for absorbing the refrigerant vaporized in the evaporator to the high-concentration absorbent supplied from the gas-liquid separator are connected by a supply path, and between the absorber and the regenerator. In an absorption refrigerating machine provided with a liquid pump, a liquid is supplied to one or more of a supply path between the liquid pump and the regenerator or a supply path between the condenser and the evaporator depending on the amount of electricity. An electromagnetic proportional control valve whose flow rate changes is provided, and the refrigerating capacity is adjusted by controlling the amount of electricity supplied to the proportional control valve. Further, in the configuration according to claim 2, the electromagnetic proportional control valve is applied to a double-effect absorption refrigerator.

[0005]

According to the absorption refrigerating machine of the present invention, a refrigerant, a high (medium) concentration absorption liquid in which a part of the refrigerant is separated by the amount of electricity to the electromagnetic proportional control valve, or a refrigerant. The refrigerating capacity is adjusted by controlling the flow rate of the low-concentration absorption liquid that absorbed the water from full opening to full closing. Therefore, the refrigerating capacity can be precisely adjusted by automatic or manual operation according to the usage state. The electromagnetic proportional control valve according to the third aspect has a simple structure, is less likely to cause a failure, and can be maintenance-free operated for a long period of time. Since the electromagnetic proportional control valve according to the fourth aspect has a constant flow rate function, the flow rate of the refrigerant or the like can be kept constant even if the pressure of the passing fluid changes. As a result, the refrigerating capacity becomes stable. In the electromagnetic proportional control valve according to the fifth aspect, the fluid can be shut off with a simple structure, and the refrigerating capacity adjustment range can be expanded. In the electromagnetic proportional control valve according to the sixth aspect, durability against an absorbing liquid that is generally highly corrosive can be improved. It should be noted that magnetic stainless steel is used for the electromagnetic driver.

[0006]

1 shows a double-effect absorption refrigerator according to an embodiment of the present invention. Above the high temperature regenerator 1 that heats the absorbing liquid with the burner B, a vertical cylindrical gas-liquid separator 2 is arranged, and the vertical low temperature regeneration having an annular cross section around the gas-liquid separator 2 is arranged. The vessel 3 is provided. A vertical absorber 4 is arranged around the low temperature regenerator 3, an evaporator 5 is provided below the absorber 4 and a condenser 6 is provided above the absorber 4.

The upper part of the high temperature regenerator 1 communicates with the lower part of the gas-liquid separator 2 through the ascending flow path 7 for the refrigerant vapor and the absorbing liquid, and the gas-liquid separator 2 uses the absorbing liquid supply path 8 for the low temperature regenerator 3. Communicates with the bottom of the. An electromagnetic proportional control valve 100 is provided in the absorbing liquid supply passage 8.
Is installed. The gas-liquid separating section 9 communicating with the upper part of the low temperature regenerator 3 is connected to the absorbent dispersion port 10 on the upper part of the absorber 4 by an absorbent supply path 11, and the absorbent supply path 1 with a pump P is connected.
At 2, the high temperature regenerator 1 is connected to the bottom of the absorber 4. An electromagnetic proportional control valve 100 is attached to the absorbent supply path 12.

A low temperature heat exchanger 19 for heating the absorption liquid from the absorber 4 is provided in the absorption liquid supply path 11 from the low temperature regenerator 3 to the absorber 4. Further, a high temperature heat exchanger 20 for heating the absorption liquid from the low temperature heat exchanger 19 to the high temperature regenerator 1 is provided in the absorption liquid supply path 8 from the gas-liquid separator 2 to the low temperature regenerator 3. The refrigerant liquid receiving portion of the gas-liquid separator 2 and the condenser 6 are communicated with each other through the refrigerant liquid supply passage 15, and the gas liquid separation portion 9 of the low temperature regenerator 3 and the condenser 6 are communicated with each other through the refrigerant vapor supply passage 16. The lower part of the condenser 6 and the refrigerant liquid spraying tool 17 of the evaporator 5 are connected by a refrigerant liquid supply passage 18. An electromagnetic proportional control valve 100 is attached to the refrigerant liquid supply passage 18.

The evaporator 5 and the absorber 4 are communicated with each other without a partition wall. The cooling coil 21 in the absorber 4 is connected to the cooling water supply source 22, and the cooling coil 23 in the condenser 6 is connected to the cooling coil 21 in the absorber 4. The coil 24 to be cooled in the evaporator 5 and the object to be cooled 25 are connected by the circulation path 26 for the heat transfer fluid. The absorbing liquid circulates in the order of the high temperature regenerator 1 → gas-liquid separator 2 → low temperature regenerator 3 → absorber 4 → high temperature regenerator 1.

In this absorption refrigerator, a low-concentration absorption liquid (lithium bromide aqueous solution) containing a large amount of refrigerant (water) is heated in the high temperature regenerator 1 and the refrigerant contained in the absorption liquid boils. Enter the gas-liquid separator 2. Here, the refrigerant is partially separated,
The absorbing liquid having a medium concentration is collected at the bottom of the gas-liquid separator 2 by the gas-liquid separating umbrella 71 provided at the outlet of the ascending flow path 7. The refrigerant is condensed on the side wall of the gas-liquid separator 2 and flows downward.

Since the inside of the gas-liquid separator 2 is almost at atmospheric pressure and the inside of the low temperature regenerator 3 is maintained at a low pressure of 70 mmHg, the medium-concentration absorption liquid passes through the supply passage 8 and the electromagnetic proportional control valve 100. It is supplied to the bottom portion of the low temperature regenerator 3 after the flow rate is controlled. The partition wall 13 that separates the gas-liquid separator 2 and the low-temperature regenerator 3 is the refrigerant vapor in the gas-liquid separator 2 and is used as the low-temperature regenerator 3.
It serves as a heat transfer wall for heating the absorbing liquid therein, and causes the refrigerant liquid generated by the condensation on the inner surface of the partition wall 13 to flow down to the refrigerant liquid receiving portion between the partition wall 13 and the inner cylinder 14.

The medium-concentration absorption liquid in the low-temperature regenerator is reheated by the heat of the gas-liquid separator 2 and boiled again, and a part of the refrigerant is vaporized in the gas-liquid separation section 9 above the low-temperature regenerator 3. Are separated and separated. As a result, the absorbing liquid having a high concentration is supplied to the upper portion of the absorber 4 via the supply passage 11. At this time, the high-concentration absorbent is cooled by the low-temperature heat exchanger 19 provided in the supply path 11, and the low-concentration absorbent in the supply path 12 is heated. Further, the refrigerant vapor separated in the gas-liquid separation section 9 enters the condenser 6 via the refrigerant vapor supply passage 16, and is cooled and liquefied by the cooling coil 23.

The liquefied refrigerant in the condenser 6 is supplied to the supply passage 18
It is supplied to the evaporator 5 via the electromagnetic proportional control valve 100 while controlling the flow rate according to the required refrigerating capacity. The inside of the evaporator 5 is in a vacuum state of about 5 mmHg, and the refrigerant sprayed from the refrigerant liquid spraying tool 17 to the cooled coil 24 instantly evaporates to remove the heat of evaporation from the cooled coil 24. As a result, the cooling target is cooled. Since the evaporated refrigerant is absorbed by the high-concentration absorption liquid, the inside of the evaporator 5 (absorber 4) is maintained at a low pressure. Since heat is generated during this absorption, the coil 4 to be cooled is arranged in the absorber 4, and the heat is exhausted to the outside to maintain the absorption. The absorbing liquid that has become a low concentration by absorbing the refrigerant is heated by the liquid pump P to the high temperature regenerator 1.
Is circulated to. At this time, the electromagnetic proportional control valve 100 provided between the pump P and the high temperature regenerator 1 appropriately controls the flow rate of the low-concentration absorbing liquid to be returned according to operating conditions such as the set required refrigerating capacity.

That is, in this absorption refrigerator, the refrigerant vapor generated from the absorption liquid in the high temperature regenerator 1 is sent to the gas-liquid separator 2 and is condensed on the inner surface of the partition wall 13 by heat exchange with the low temperature regenerator 3. The refrigerant liquid is sent from the gas-liquid separator 2 to the condenser 6. Further, the refrigerant vapor generated from the absorbing liquid in the low temperature regenerator 3 is sent from the gas-liquid separator 2 to the condenser 6. Then, in the condenser 6, the refrigerant vapor is condensed by the action of the cooling coil 23, and the refrigerant liquid sent from the condenser 6 to the evaporator 5 is vaporized by the action of the coil 24 to be cooled, and then from the evaporator 5 to the absorber 4. The sent refrigerant vapor is absorbed by the absorbing liquid, the heat due to the absorption is taken out by the action of the cooling coil 21, and the refrigerant is circulated. as a result,
The heat input from the cooling target 25 is sent from the evaporator 5 to the absorber 4, and then applied to the cooling water by the action of the cooling coil 21 and discharged to the outside.

FIG. 2 shows a cross section of the electromagnetic proportional control valve 100. The electromagnetic proportional control valve 100 includes an electromagnetic coil 102 arranged outside a pipe line 101 that constitutes a supply line of an absorption liquid or a refrigerant liquid, and an annular ring arranged inside the pipe line 101 inside the electromagnetic coil 102. Magnetic driver 103 and the conduit 101
Throttle valve 110 for adjusting the opening degree of the throttle valve 11 and the throttle valve 11
It is composed of a zero valve body 120 and a spring 104 interposed between the magnetic drive body 103.

The throttle valve 110 includes a valve port 111 formed of a circular orifice provided in the pipe line 101, and a valve body 120 penetrating the valve port 111. The valve body 120 is located on the upstream side of the valve port 111, and has an inverted conical portion 121 for adjusting the opening degree of the valve port 111, the inverted conical portion 121 and the connecting rod 1.
The pressure receiving plate 124 with a small orifice 123 is integrally connected with the valve 22 and is located downstream of the valve port 111. When the pressure of the flow passage increases, the valve body 120 compresses the spring 104 due to the increase of the pressure difference between the upstream side surface and the downstream side surface of the pressure receiving plate 124 and is displaced upward in the drawing, and the inverted conical portion 121 causes the inverted conical portion 121 of the valve port 111 to move. It has a constant flow valve function to reduce the degree of opening.

In the above electromagnetic proportional control valve 100, the magnetic driver 103 is made of magnetic stainless steel, and the conduit 101, the valve body 120, the orifice plate forming the valve port 111, and the spring 104 are made of stainless steel. This is because lithium bromide, which is the absorbing liquid, has strong corrosiveness.

FIG. 3 shows another embodiment of the electromagnetic proportional control valve 100. In this embodiment, the connecting rod 122 of the valve body 120.
A taper portion 125 is formed between the pressure receiving plate 124 and the pressure receiving plate 124, and when the energization amount of the electromagnetic coil 102 is equal to or larger than a predetermined value, the magnetic drive body 103 is displaced downward in the drawing to move the valve body 120 via the spring 104. When pressed downward, the tapered portion 125 closes the valve port 111. Since backflow can be prevented, there is no need to add a new solenoid valve. With this configuration, the electromagnetic proportional control valve 100 also functions as an opening / closing valve that opens / closes the conduit 101.

In the absorption refrigerating machine of the above embodiment, the amount of electricity supplied to each electromagnetic proportional control valve is appropriately controlled from fully open to fully closed according to the refrigerating capacity required in accordance with the use condition, and the medium concentration absorbent supply path is provided. 8, the flow rates of the low-concentration absorption liquid supply passage 12 and the refrigerant liquid supply passage 18 are optimally adjusted. As a result, a low fuel consumption operation and an optimum refrigeration operation of the suction type refrigerator are achieved, and a constant flow rate can be secured according to the controlled opening degree even if there is a pressure change due to a pump or temperature change.

In the above embodiment, the double effect type absorption refrigerator having excellent thermal efficiency has been described. However, the electromagnetic proportional control valve 100 can be applied to a simple structure (single effect type) absorption refrigerator. Of course. In the above-mentioned embodiment, the electromagnetic proportional control valve 100 is provided at three places in the absorption refrigerator, but if the refrigerating capacity does not need to be adjusted very precisely depending on the purpose of use of the refrigerator, It may be attached to any one or two places.

[Brief description of drawings]

FIG. 1 is a conceptual diagram of an absorption refrigerator according to the present invention.

FIG. 2 is a sectional view of an electromagnetic proportional control valve.

FIG. 3 is a sectional view of an electromagnetic proportional control valve according to another embodiment.

[Explanation of symbols]

 1 High Temperature Regenerator 2 Gas-Liquid Separator 3 Low Temperature Regenerator 4 Absorber 5 Evaporator 6 Condenser 8 Absorbing Liquid Supply Channel (Flow Path) 11 Absorbing Liquid Supply Channel (Flow Path) 18 Refrigerant Liquid Supply Channel (Flow Path) 25 Cooling target 100 Electromagnetic proportional control valve 102 Electromagnetic coil 103 Magnetic driver 104 Spring 110 Throttle valve 120 Valve body

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Naoto Nomura, No. 26, Fukuzumi-cho, Nakagawa-ku, Nagoya City, No. 26, Rinnai Co., Ltd. (72) Toru Fukuchi, No. 1-2, Hirano-cho, Chuo-ku, Osaka City, Osaka Prefecture In Osaka Gas Co., Ltd. (72) Inventor Katsuhiko Uenishi 4-1-2, Hirano-cho, Chuo-ku, Osaka-shi, Osaka

Claims (6)

[Claims] 1. A regenerator for boiling a low-concentration absorption liquid containing a refrigerant, a gas-liquid separator for separating the boiling absorption liquid into a refrigerant vapor and a high-concentration absorption liquid, and a condenser for condensing the separated refrigerant vapor. And an evaporator that cools the object to be cooled by the heat of vaporization of the liquid-phase refrigerant condensed in the condenser, and an absorption that absorbs the refrigerant evaporated in the evaporator into the high-concentration absorption liquid supplied from the gas-liquid separator In the absorption type refrigerator having a liquid pump provided between the absorber and the regenerator, which is connected to the regenerator with a supply path, a supply path between the liquid pump and the regenerator, or a condenser and an evaporator. An electromagnetic proportional control valve that changes the liquid flow rate according to the amount of electricity supplied is provided at any one or more of the supply paths between the two, and the amount of electricity supplied to the proportional control valve is changed by a pump or pressure change due to temperature change. Also, the flow rate is kept constant according to the controlled opening. Absorption chiller which is characterized by adjusting the cooling capacity by controlled so. 2. A high-temperature regenerator for boiling a low-concentration absorption liquid containing a refrigerant, a gas-liquid separator for separating the boiling absorption liquid into a refrigerant vapor and a medium-concentration absorption liquid, and the separated middle-concentration absorption liquid. A low-temperature regenerator that re-boils to separate the refrigerant vapor and the high-concentration absorption liquid and at the same time liquefy the refrigerant vapor in the gas-liquid separator, and a condenser that condenses the refrigerant separated in the gas-liquid separator and the low-temperature regenerator. Supply path for an evaporator, an evaporator for cooling a cooling target by heat of vaporization of the liquid-phase refrigerant condensed by the condenser, and an absorber for absorbing the refrigerant evaporated by the evaporator in the high-concentration absorption liquid regenerated at low temperature In a double-effect absorption refrigerator with a liquid pump installed between the absorber and the high-temperature regenerator, the supply path between the liquid pump and the high-temperature regenerator, the gas-liquid separator and the low-temperature regeneration Between the condenser and the evaporator, or between the condenser and the evaporator An electromagnetic proportional control valve that changes the liquid flow rate according to the amount of electricity supplied is provided at any one or more of the supply passages, and the amount of electricity supplied to the proportional control valve can be changed even if there is a pressure change due to a pump or temperature change. Is an absorption refrigerating machine, wherein the refrigerating capacity is adjusted by controlling so that a constant flow rate is secured according to a controlled opening degree. 3. The electromagnetic proportional control valve according to claim 1, wherein the electromagnetic proportional control valve has an electromagnetic coil arranged outside the supply passage, and a magnetic driver arranged inside the supply passage inside the electromagnetic coil. An absorption refrigerator comprising: a throttle valve for adjusting the opening degree of the supply passage; and a spring interposed between the valve body of the throttle valve and the magnetic drive body. 4. The throttle valve according to claim 3, wherein the throttle valve is provided with a valve opening, a valve element located upstream of the valve opening for adjusting the opening degree of the valve opening, and integrally connected with the valve element. And a pressure receiving plate with an orifice located downstream of the valve port, and when the pressure in the supply path increases, the pressure difference between the upstream side surface and the downstream side surface of the pressure receiving plate increases to compress the spring to compress the valve body. Is an absorption refrigerator that is a constant flow valve that reduces the degree of opening of the valve port. 5. The throttle valve according to claim 4, wherein the pressure receiving plate, the valve body, or a connecting portion between the two fully closes the valve opening by adjusting the amount of electricity supplied to the electromagnetic coil. Even if there is a change, the flow rate is an absorption refrigerator that also functions as an on-off valve that ensures a constant flow rate according to the controlled opening. 6. The absorption refrigerator according to claim 4, wherein the magnetic drive body, the pressure receiving plate, the valve body, a connecting portion between the two, a member forming a valve opening, and a spring are made of stainless steel.