JPS63290361A - Absorption refrigerator for refrigerator truck - Google Patents

Abstract

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

Description

[Detailed description of the invention] Industrial applications The present invention relates to an absorption refrigerator for a refrigerated vehicle.

Conventional technology Conventionally, the refrigeration temperature in a refrigerated truck can be broadly divided into 0℃,
Temperatures lower than 0°C, 20°C and -50°C, were used, and a compression type refrigerator was used as the refrigerator.

Problems to be Solved by the Invention According to the conventional compression refrigerator mentioned above, since the driving force of the engine is used, the energy required for refrigeration is required as it is, and the energy obtained from the engine is more than the energy of the fuel. There was a problem that the number was about 173 and it was very inconvenient. By the way, there is an absorption refrigerator that can use the heat of exhaust gas from the engine, but in this case, the temperature of the refrigerator is higher than 0℃, so it can usually only be used in automatic air conditioners. It was something.

SUMMARY OF THE INVENTION Therefore, an object of the present invention is to solve the above-mentioned problems and provide an absorption refrigerating machine for a blue refrigerated vehicle.

Step 1 for Solving the Problems In order to solve the above problems, the absorption refrigerator for a refrigerated vehicle of the present invention has first and second IrB condensers each having an evaporator, an absorber, a regenerator, and a total cold condensing IrB refrigerating machine. An absorption cycle is provided, and engine cooling water is used as a heat source for the regenerator of the first absorption cycle, and exhaust gas from the engine is used as a heat source for the regenerator of the second absorption cycle, and the evaporator of the first absorption cycle is used to generate a freezer. At the same time, the evaporator of the second absorption cycle removes the heat generated in the absorber of the first absorption cycle.

In the first absorption cycle, the absorption liquid is regenerated by the heat of the engine cooling water, and its evaporator generates cold heat for the freezer. The heat regenerates the absorption liquid, and the evaporator of the second absorption cycle removes heat from the absorption liquid in the first absorption cycle, and the evaporator of the first absorption cycle produces a lower temperature. Cold heat is generated.

EXAMPLE Hereinafter, an example of the present invention will be described with reference to FIGS. 1 and 2.

The gist of the present invention is to adopt an absorption type refrigerating machine to be loaded on a refrigerated truck, and to provide two absorption cycle systems.
The heat of cold N3 water in the engine is used as the driving heat source for one absorption cycle (hereinafter referred to as the 1st absorption cycle), and the engine is used as the driving heat source for the other absorption cycle (hereinafter referred to as the 2nd absorption cycle). In addition, the heat generated in the absorber in the first absorption cycle is taken away in the second absorption cycle, that is, the heat is taken away from the absorption liquid in the absorber in the first absorption cycle,
@The idea is to generate cold heat at a lower temperature in the evaporator during the collection cycle.

The configuration will be explained below. 1 is a refrigerated truck engine,
2 is a radiator for dissipating heat from engine cooling water; 3 is an exhaust pipe for discharging exhaust gas from the engine 1; a heat exchange tube (heat transfer tube) 4 is disposed in the middle of the exhaust pipe. In addition,
5 is a bypass pipe that bypasses the heat exchange tube 4; 6;
is a valve body for switching, for example, exhaust is performed via the bypass pipe 5 when freezing is not performed.

11 is a first absorption cycle driven by the heat of cold IJ1 water, which directly cools the freezer.

This first @ collection cycle 11 is a refrigerant liquid (for example, fluorocarbon 2
2), a first evaporator 12 that evaporates
A first absorber 13 absorbs the cold tIX vapor generated in step 2 into a concentrated absorption liquid (for example, diethylene glycol dimethyl ether (DEGQME)), and this first absorber 13 absorbs refrigerant vapor to reduce A first regenerator 14 that heats the absorption liquid using the heat of the cooling water to evaporate the refrigerant.
A first gas-liquid separator 15 separates the refrigerant vapor generated in the first regenerator 14 from the concentrated absorption liquid, and a first gas-liquid separator 15 condenses and liquefies the refrigerant vapor separated in the first gas-liquid separator 15. A first air-cooled condenser 16 for cooling the refrigerant liquid, and a first gas-liquid separator 15
A first concentrated absorption liquid transfer pipe 18 which transfers the concentrated absorption liquid from 11 to the first absorber 13 and has a liquid throttle valve 17 in the middle
, a first refrigerant vapor transfer pipe 19 for transferring refrigerant vapor from the first gas-liquid separator 15 to the first air-cooled condenser '816, and a first refrigerant vapor transfer pipe 19 for transferring the refrigerant vapor from the first air-cooled condenser 16 to the first evaporator 12. A first refrigerant liquid transfer pipe 2 that transfers and has an expansion valve 20 in the middle.
1, a first refrigerant vapor transfer pipe 22 for transferring refrigerant vapor from the first evaporator 12 to the first absorber 13 via the first absorption liquid transfer pipe 18, and a liquid pump 23 in the middle. A first dilute absorption liquid transfer pipe 24 that transfers the dilute absorption liquid from the first collector 13 to the first regenerator 14 and a first gas-liquid separation of the gas-liquid mixed absorption liquid from the first regenerator 14. A first absorbent liquid transfer pipe 25 that transfers to the vessel 15, a first heat recovery device 26 that performs heat recovery between the 1212nd absorbent liquid transfer pipe 18 and the first diluted absorbent liquid transfer pipe 24, and a liquid pump installed in the middle. 27 to the right and the cooling water in the engine 1 to the first regenerator 15.
and a cooling water circulation pipe 28 which is connected to the radiator 2. In addition, 29 is the cooling water circulation pipe 2.
A bypass pipe is installed in the refrigerant 88 via the three-way switching valve 30 to prevent cooling water from being transferred to the first regenerator 14 when refrigeration is not required.

A second absorption cycle 31 is driven by the heat of the 1N gas and is used to cool the absorption liquid in the first absorption cycle 11. This second absorption cycle 31 includes a second evaporator 32 that evaporates the refrigerant liquid (for example, Freon 22) and removes the absorption heat generated in the first absorber 13; The refrigerant vapor is absorbed by a concentrated absorption liquid (e.g. diethylene glycol dimethyl ether (DEGDME)
) and the second absorber 3 which is air-cooled by 7J]
3, a second regenerator 34 that heats the diluted absorption liquid whose concentration has been reduced by absorbing refrigerant vapor in the second absorber 33 using the heat of the exhaust gas from the engine 1 to evaporate the refrigerant; A second gas-liquid separator 35 separates the refrigerant vapor generated in the second regenerator 34 from the concentrated absorption liquid; The second air-cooled condenser 36 and the second gas-liquid separator 35 transfer the concentrated absorption liquid to the second absorber 33 and have a liquid throttle valve 37 in the middle. an absorption liquid transfer pipe 38; a second refrigerant vapor transfer tube 39 that transfers refrigerant vapor from the second gas-liquid separator 35 to the second air-cooled condenser 36; A second refrigerant liquid transfer pipe 41 having an expansion valve 40 in the middle and transferring the refrigerant vapor from the second evaporator 32 to the second evaporator 32 and a second concentrated absorption liquid transfer pipe 38 to the second absorber 33 a second cold IR vapor transfer pipe 42 for transferring the diluted absorption liquid from the second absorber 33 to the second regenerator 34; A second absorption liquid transfer pipe 45 that transfers the gas-liquid mixed absorption liquid from the second regenerator 34 to a second gas-liquid separation 835, a second concentrated absorption liquid transfer pipe 38, and a second
It has a second heat recovery device 46 that performs heat recovery between the dilute absorption liquid transfer tube 44 and a liquid pump 47 in the middle, and a heat medium (exhaust gas A heat medium circulation pipe 48 that circulates a heat medium (withstands temperature m). Note that the first and second air-cooled condensers 1B
, 36, the second absorber 33 and the radiator 2 are air cooled by a fan 7.8.9.10.

Next, the effect will be explained.

Now, let me explain about the first absorption cycle.

The heat of the cooling water of the engine 1 is transferred to the first internal generator 14, where the dilute absorption liquid is heated to about 95° C. to generate refrigerant vapor. The absorption liquid in a gas-liquid mixed state enters the first gas-liquid separator 15 and is separated into cold tR vapor and concentrated absorption liquid. This cold! The steam is transferred to the outside air (3
5°C) to about 40°C to 50°C to condense and liquefy. The liquefied refrigerant liquid passes through the expansion valve 20, is reduced in pressure to about 2.5 ata, and enters the first evaporator 12.
By evaporating 'C'' here, cold heat of about -20°C is generated. This cold heat is used for refrigeration. The evaporated refrigerant vapor (2.5 ata) enters the first absorber 13,
It is then absorbed into a concentrated absorption liquid (for example diethylene glycol dimethyl ether (DEGDME)). The diluted absorption liquid, whose temperature has become diluted by absorbing the refrigerant vapor, is transferred to the liquid pump 23.
Up to about 20ata? The first heat recovery device 26
It is sent to the first regenerator 14 via the cooling water, where it is heated again by the heat of the cooling water and enters the first gas-liquid separator 15.

- The concentrated absorption liquid, whose concentration has been increased by separating the refrigerant in the first gas-liquid separator 15, is returned to the first absorber 13 after giving heat to the dilute absorption liquid in the first heat recovery unit 26. The refrigerant vapor is absorbed again. By the way, the heat generated when the first absorber 13 absorbs the refrigerant vapor is absorbed by the second collection cycle described later, and the temperature of the absorption liquid decreases, and the evaporation temperature of the refrigerant also decreases. The temperature drops to around -20°C.

Next, the operation of the second absorption cycle will be explained. Since the only difference from the first absorption cycle is that the driving heat source is exhaust gas, the operation will be explained in the cylinder.

That is, the heat of the exhaust gas is transferred to the second
The dilute absorption liquid is transmitted to the regenerator 34, where it is heated to about 130° C., generates refrigerant vapor, becomes a concentrated absorption liquid, and enters the second gas-liquid separator 35 in a gas-liquid mixed state. The cold water separated by the second gas-liquid separator 35! The steam is cooled to about 50° C. by outside air in the second air-cooled condenser 36 and is condensed and liquefied. The liquefied refrigerant liquid is depressurized through the expansion valve 40, enters the second evaporator 32, and is then transferred to the first absorber 13 as described above.
It evaporates by taking away the heat generated. This evaporated cold ts vapor is absorbed by the second absorber 32, where the diluted absorption liquid is cooled down to about 50°C by outside air, and then pressurized to 20ata culm by the liquid pump 43. It is sent to the second regenerator 34, heated again, and enters the second gas-liquid separator 35. On the other hand, the concentrated absorption liquid regenerated in the second gas-liquid separator 35 is depressurized to about 5 ata via the liquid throttle valve 37 after giving heat to the dilute absorption liquid in the second heat recovery unit 46. The refrigerant vapor enters the second absorber 33 and absorbs the refrigerant vapor again.

Incidentally, FIG. 2 shows a Duering diagram for each of the above absorption cycles 11.31.

As mentioned above, by using two absorption cycles, the temperature of the exhaust gas is 450℃~600''C, 50''
00~8000kcal/h) and the heat of engine cooling water (100℃, 8000~10000kcal/h)
/h) and uses Freon as a refrigerant (
By setting the maximum operating temperature of Freon to about 130°C and the coefficient of performance (coefficient of performance) of about 0.4 to 0.5, a refrigerator at the -20°C level can be realized.

Specifically, with a heat source of cooling water at a level of 100°C and an outside temperature of 35°C, cold heat at a level of -20°C cannot be generated. In other words, when trying to cool down to -20℃,
In Figure 2, A1 needs to be cooled to a level of 5°C. On the other hand, the heat of exhaust gas is used to reduce the regeneration temperature to 1.
When the temperature is 30℃, it is possible to generate cold energy at the level of 0℃ with outside air at 35℃ (Figure 2 "2").If this cold energy is used for the cooling Ul of A1 (5℃) mentioned above, it will become cold. I.J.
The heat that J water has makes it possible to achieve cold heat R1 of -20 degrees Celsius, which cannot be obtained with c water.

By the way, the conditions such as temperature and pressure described in the above embodiments are planned values and vary depending on the engine load, outside air temperature, etc.

Moreover, in the above embodiment,! '52 A heat medium was used when exchanging heat between the regenerator 34 and the exhaust gas, but the second
The regenerator 34 can also be passed directly through the exhaust pipe 3.

Effects of the Invention According to the above configuration of the present invention, two absorption cycles are provided, and the heat of the engine cooling water is used as the driving heat source of one absorption cycle, and the heat of the exhaust gas is used as the driving heat source of the other absorption cycle. In other words, since exhaust heat is used, no extra energy is required and it is very economical compared to conventional systems that use the rotational driving force of the engine. In addition, because the heat generated in the absorber of one absorption cycle, which generates cold heat for the freezer, is taken away by the evaporator of the other absorption cycle, the temperature is much lower than that in conventional absorption air conditioners. can be obtained.

[Brief explanation of the drawing]

FIG. 1 is a schematic diagram of the structure of an absorption refrigerator according to an embodiment of the present invention, and FIG. 2 is a Duering diagram of a refrigerant and an absorption liquid. DESCRIPTION OF SYMBOLS 1... Engine, 2... Radiator, 3... Exhaust pipe, 11... First absorption cycle, 12... First evaporator, 13... First absorber, 14... 1st regenerator, 1
5... first gas-liquid separator, 16... first air-cooled condenser,
31... Second absorption cycle, 32... Second evaporator,
33... Second absorber, 34... Second regenerator, 35...
...Second gas-liquid portion LULL3.36...Second air-cooled condenser. Agent Yoshihiro Morimoto Figure 2 Product #c>

Claims (1)

[Claims] 1. First and second absorption cycles each having an evaporator, an absorber, a regenerator, and an air-cooled condenser are provided, and engine cooling water is used as a heat source for the regenerator of the first absorption cycle, and a heat source for the regenerator of the second absorption cycle. The exhaust gas from the engine is used as the exhaust gas, and the evaporator of the first absorption cycle generates cold heat for the freezer, and the evaporator of the second absorption cycle removes the heat generated in the absorber of the first absorption cycle. An absorption refrigerating machine for refrigerated cars, which is characterized by: