JP3387583B2 - Liquid refrigerant dripping device for absorption cooling machine - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an evaporator used in an absorption type air conditioner / refrigerator, and more particularly to a liquid refrigerant dropping device for efficiently and evenly dropping a refrigerant into a large number of evaporation pipes. It is a thing. In this specification, the term "cooler" includes "refrigerator" unless otherwise specified.

[0002]

2. Description of the Related Art A conventional absorption type air conditioner has a structure as shown in FIG. In the figure, 1 is an evaporator, the inside of which is maintained in a vacuum state of about 10 torr. A liquid refrigerant supply pipe 2 is connected to the evaporator 1 from above, and a liquid refrigerant 3 such as water is granulated and dropped or dispersed in a vacuum inside the evaporator 1. An evaporator pipe 4 is piped in the evaporator 1, and circulating water flows in the inside of the evaporator 1 in a direction of an arrow in the figure. The liquid refrigerant 3 that has been sprayed and adhered to the evaporation pipe 4 evaporates due to the heat of the circulating water in the evaporation pipe 4, removes heat of vaporization from the circulating water, and cools the circulating water. The cooled circulating water reaches a heat exchanger such as an indoor unit (not shown) in each room, and cool air is sent to the room by a fan to cool the room.

The vapor of the liquid refrigerant evaporated in the evaporator 1 is sent to the absorber 6 via the pipe line 5. Inside the absorber 6, there is an absorbing liquid 7 composed of a concentrated solution of lithium bromide, and the vapor of the liquid refrigerant is absorbed by the absorbing liquid 7 while being cooled by a cooling fan 8 outside the absorber 6. As a result, the inside of the evaporator 1 is always kept at a desired degree of vacuum, and the liquid refrigerant can be continuously evaporated.

The absorbing liquid 7 absorbs the liquid refrigerant and changes from a concentrated solution (such as lithium bromide) to a dilute solution, and at the same time, the absorbing power decreases. Then, the absorbing solution 7 which has become a lithium bromide dilute solution is conveyed to the regenerator 11 by the pipe line 9 and the pump 10, where it is heated by the burner 12 to evaporate the liquid refrigerant and return it to the concentrated solution. The concentrated solution whose absorption power has been restored in this way is returned to the absorber 6 from the pipe line 13.

The liquid refrigerant evaporated in the regenerator 11 is transferred to the conduit 1
4 enters the condenser 15, where it is cooled by the fan 16 and liquefied into the liquid refrigerant supply pipe 2 and supplied to the evaporator 1. With the above, the cooling cycle is completed, and thereafter this cycle is repeated.

FIG. 5 shows the above-mentioned absorption type cooling device.
It is a figure which shows the structure of the liquid refrigerant dropping device provided in the evaporator 1. A liquid refrigerant supply pipe 2 is connected from above the evaporator 1, and the liquid refrigerant 3 dropped in the evaporator 1 is stored in a tray 20 having a rectangular cross section provided in the evaporator 1. A plurality of J-shaped liquid guide plates 2 are provided on one side wall of the tray 20.
1 are attached at substantially equal intervals. The liquid guide plate 21 has a shorter end portion 21 as shown in FIGS.
A groove 21c is formed by immersing a in the tray 20 and extending to the longer end 21b from which the liquid refrigerant is dropped, and a hole 21d is formed in the middle of the groove 21c.

The liquid refrigerant 3 supplied from the liquid refrigerant supply pipe 2 into the tray 20 is stored in the tray 20 and eventually immerses the end 21a of the liquid guide plate 21. Then, by capillarity, it reaches the tip 21b through the groove 21c and drops from there to wet the evaporation tube 4. Since the inside of the evaporator 1 is kept in vacuum as described above, the liquid refrigerant 3 is evaporated at the temperature of the water passing through the inside of the evaporation pipe 4, and the above-described cooling cycle is performed.

[0008]

However, in the above-mentioned prior art, by the time the liquid refrigerant 3 drops into the evaporation pipe 4, the liquid refrigerant 3 begins to be put into the empty tray 20, and the liquid refrigerant 3 becomes considerably large. It collects and reaches the end 21a of the liquid guide plate 21,
It takes time for the liquid to reach the tip 21b of the liquid guide plate through the groove 21c and to be dropped in the evaporation tube. However, it is not a problem to cool a large amount of circulating water at all times and drive the indoor unit in each room as needed to cool the room, but use it by turning it on and off like at home. In the air conditioner, there is a problem that the cooling does not start easily due to this time.

Further, in the prior art utilizing the above-mentioned capillary phenomenon, it is very difficult to drop the liquid refrigerant from a plurality of liquid guiding plates in the same manner, and a liquid guiding plate that does not drip is produced to improve the cooling capacity. I can't show enough.

The present invention has been made to solve the above problems, and an object of the present invention is to provide a liquid refrigerant dropping device capable of surely dropping a liquid refrigerant. Another object of the present invention is to provide a liquid refrigerant dropping device capable of uniformly dropping the liquid refrigerant from all of the plurality of liquid guide plates. Further, another object is to provide a liquid refrigerant dropping device that can start cooling in a short time.

[0011]

In order to achieve the above-mentioned object, the present invention is directed to dropping a liquid refrigerant into an evaporation pipe provided in a vacuum evaporator to evaporate the liquid refrigerant, and to use the heat of vaporization during the evaporation. the air or the like is cooled, is used in absorption cooling machine to be absorbed in the absorbing solution evaporated liquid refrigerant, the liquid refrigerant dropping device for dropping by storing the liquid refrigerant in the tray into the evaporator, before
The closer the tray is to the bottom, the volume per unit depth
The tray is configured to be small , a through hole is formed in the side wall of the tray, and a liquid guiding plate is provided to cover the through hole with an appropriate gap, and a liquid refrigerant is supplied from the liquid guiding plate to the evaporation pipe. The feature is that it is made to drop.

A plurality of through holes may be formed at substantially equal intervals, and the diameters of the through holes and the gaps between the liquid guide plates may be made substantially the same, or the through holes may be formed substantially in the same manner. or a structure that is a plurality drilled at regular intervals, the through hole is configured and be Rukoto that are drilled near the bottom of the tray is desired.

[0013]

When the liquid refrigerant is supplied to the tray inside the evaporator,
It is stored in the tray and the water level reaches a through hole formed in the side wall of the tray. Since water pressure is applied to the through hole, even if there is surface tension, etc., the water pressure overcomes this, the liquid refrigerant spouts from the through hole and moves to the liquid guide plate, and moves below the liquid guide plate. Drop from the tip of to the evaporation tube. If the amount of liquid refrigerant in the tray is small, the amount of liquid refrigerant dropped will also be small,
As the amount of liquid refrigerant in the tray increases, the amount of liquid refrigerant to be dropped also increases.

Even if there are a plurality of through-holes, if the diameter of each through-hole and each gap between each liquid-conducting plate are made substantially the same, the liquid refrigerant can be uniformly dropped from any through-hole. .
Further, if the through hole is located below the side wall, the time required from the start of supplying the liquid refrigerant to the dropping can be shortened. Further, if the tray has a structure in which the volume per unit depth decreases toward the bottom, the time required for dropping can be further shortened.

[0015]

Embodiments of the present invention will be described below with reference to the drawings. 1 to 3 are diagrams showing the configuration of a liquid refrigerant dropping device 30 according to the present invention. In these figures, tray 31
Is inside the evaporator 1 and receives the liquid refrigerant from the liquid refrigerant supply pipe 2 inserted from above the evaporator 1, so that it is arranged below the pipe 2 and the left and right side walls 31a and 31b are V-shaped. In combination, both ends are fixed by inverted triangular side plates 31c and 31d, and the upper side is opened. In the vicinity of the lower end of one side wall 31a of the tray 31, a plurality of through holes 32 having the same diameter are formed at substantially equal intervals. A liquid guide plate 33 is attached to the outside of the side wall 31a so as to face each through hole 32. The liquid guide plate 33 has a rectangular plate shape, and has a triangular lower end to be sharpened so that the liquid refrigerant can be easily dropped.

As can be seen clearly in FIG. 1, the liquid guide plate 33 is in contact with the upper end of the side wall 31a of the tray 31, and a slight gap Δd is maintained at the lower end of the side wall. The gap Δd is the same for all through holes, and the amount of the liquid refrigerant flowing out from each through hole 32 having the same diameter is made uniform.

Reference numeral 34 is an evaporation pipe, which in this embodiment is a hollow pipe through which circulating water does not pass, unlike the conventional example.
The upper end is put in the evaporator 1, and most of it is housed in a heat exchanger 35 formed separately from the evaporator 1. Although illustration is omitted, the heat exchanger 35 of the evaporation pipe 34 is covered with a heat insulating material between the evaporator 1 and the heat exchanger 35 of the evaporation pipe 34.
A large number of fins are attached to the portion housed in the interior for efficient heat exchange.

Next, the operation of the present invention will be described. Liquid refrigerant 3
When is supplied into the tray 31 from the liquid refrigerant supply pipe 2, it starts to accumulate at the bottom of the tray 31. The through hole 32 is the side wall 3
Since it is near the lower end of 1a, when some liquid refrigerant accumulates in the tray 31, the liquid refrigerant soon comes out from each through hole 32, fills the gap, and is transmitted to the liquid guiding plate 33. Is dripped into each evaporation pipe 34 from the tip. Since the inside of the evaporator pipe 34 has the same vacuum as the inside of the evaporator 1, the liquid refrigerant 3 evaporates in the evaporator pipe 34, deprives the evaporation pipe 34 of heat of vaporization, and cools the evaporator pipe 34 in the heat exchanger 35. In the heat exchanger 35, air is sent to the evaporation pipe 34 by a fan (not shown) to cause heat exchange to cool the air and use it for cooling or the like.

As shown in the above embodiment, if the tray 31 has a triangular sectional shape, the volume of the tray per unit depth becomes smaller as it approaches the bottom of the tray. The time until the liquid refrigerant 3 starts to flow out from the through hole 32 after the refrigerant 3 is supplied is shortened. Further, when the liquid refrigerant 3 reaches the through hole 32, it is immediately dropped, so that it is not necessary to wait until it reaches the tip of the liquid guide plate due to the capillary phenomenon.

The diameter of each through hole 32 and the size of the gap Δd are the same, and the water surface of the liquid refrigerant and each through hole 32 are the same.
By making the distance (height) to and constant, a uniform water pressure is applied to each through hole, and the liquid refrigerant can be uniformly dropped.

Further, since the water pressure applied to the through hole 32 changes depending on the water level of the liquid refrigerant in the tray 31, the dropping amount can be adjusted according to the amount of the liquid refrigerant in the tray.

That is, when the operation is started, the liquid refrigerant is supplied into the tray, but the liquid refrigerant gradually accumulates at the bottom of the tray. Begin to. When the amount of liquid refrigerant in the tray is small, the amount of dripping decreases, and when the amount of liquid refrigerant in the tray increases, the pressure also increases, so the amount of dripping also increases and the liquid refrigerant overflows from the tray 31. Prevent.

At the beginning of the supply of the liquid refrigerant to the tray, even if there is a place where it does not drip due to the surface tension acting between the through hole 32 and the liquid guide plate 33, if the amount of liquid in the tray increases, the pressure will increase. Therefore, the surface tension is overcome and the dropping is surely started.

In the above embodiment, the tray 31 has a triangular cross-section, but various shapes such as a semi-circle and a trapezoid may be used as long as the unit depth becomes smaller toward the bottom. it can. Further, it is obvious to those skilled in the art that the evaporation tube may be of a type that allows circulating water as shown in the conventional example.

Next, a method of adjusting the cooling capacity will be described. The first method is a method in which the temperature is adjusted according to the temperature of the external air sent to the heat exchanger 35. In the embodiments of FIGS. 1 to 3, the liquid refrigerant of about 6 CC per minute at maximum is dripped (not continuously) from the tip of each liquid guide plate 33, and the inside of the evaporator 1 is as described above. Since the liquid refrigerant 3 in the tray 31 is evaporated and the liquid refrigerant 3 is cooled because the vacuum is maintained, the liquid refrigerant 3 is less likely to evaporate due to this cooling.

On the other hand, in the evaporation pipe 34 in the heat exchanger 35,
Although not shown, a large number of fins are provided, and air is sent from the outside by a fan, and heat is exchanged in the evaporation pipe 34. That is, the sent air is cooled and the evaporation pipe 34 is warmed up. When the evaporation pipe 34 is warmed, evaporation of the liquid refrigerant is promoted.

Therefore, if the outside air is warm, the evaporation of the liquid refrigerant in the evaporation pipe 34 will be active, and if the outside air is cold, the evaporation in the evaporation pipe 34 will be slowed down. In other words, cooling capacity improves in summer and cooling capacity decreases in winter, which makes sense.

The second method is to change the amount of air sent to the heat exchanger 35. Even with outside air of the same temperature, if the amount of air sent in is large, the evaporation power will be large, and if it is small, it will be small, so the cooling capacity can be changed.

As a third method of changing the cooling capacity, there is a method of adjusting the heating and burning power in the regenerator. When the burner is ignited and the diluted lithium bromide solution in the regenerator is heated, the liquid refrigerant evaporates and vapor goes to the condenser, where it is cooled and returned to the liquid refrigerant, passes through the liquid refrigerant supply pipe 2, Begin supplying liquid refrigerant to the refrigerant dropping device. Since the supply amount of the liquid refrigerant changes according to the change of the combustion power of the burner, the evaporation amount of the liquid refrigerant changes accordingly, and the cooling capacity can be changed. In the liquid refrigerant dropping device of the present invention, the capacity of the absorption type air conditioner is controlled by these various methods.

[0030]

As described above, according to the present invention ,
The volume per unit depth becomes smaller toward the bottom of the ray
And a through hole in the side wall of this tray,
Since a liquid guide plate is provided to cover the hole with a minute gap and the liquid refrigerant is dropped from the liquid guide plate to the evaporator, the liquid refrigerant is surely dropped and the cooling capacity is sufficiently improved. It can be used for a long time until the start of liquid refrigerant dropping.
The time is shortened and early operation becomes possible. Further, if a plurality of through holes are provided, the liquid refrigerant can be uniformly dropped from the plurality of liquid guide plates .

[Brief description of drawings]

FIG. 1 is a cross-sectional view of essential parts showing a configuration of a liquid refrigerant dropping device of the present invention.

FIG. 2 is a perspective view showing a configuration of a main part of the liquid refrigerant dropping device of the present invention.

FIG. 3 is a side view of a tray of the liquid refrigerant dropping device.

FIG. 4 is a configuration diagram of a conventional absorption type air conditioner.

FIG. 5 is a cross-sectional view showing a configuration of a conventional liquid refrigerant dropping device.

6 is a diagram of a liquid guide plate used in the liquid refrigerant dropping device of FIG. 5, (a) is a front view, and (b) is a BB cross-sectional view of (a).

[Explanation of symbols]

1 evaporator 3 liquid refrigerant 6 absorber 7 absorption liquid 30 Liquid refrigerant dropping device 31 trays 32 through holes 33 Liquid guide plate 34 Evaporation tube

─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Masayuki Fujimoto 6-B-702 Hinode, Urayasu City, Chiba Prefecture (72) Inventor Toshiya Okano 4-94, Chiyosaki-cho, Naka-ku, Yokohama City, Kanagawa Prefecture Hideki Tani Osaka Prefecture Co., Ltd., Chuo-ku, Hiranomachi 4-1-2, Osaka Gas Co., Ltd. (72) Inventor Kazuya Imai, Osaka, Chuo-ku, Hirano-cho, 4-1-2 Osaka Gas Co., Ltd. (56) References JP-A-3-105176 (JP, A) Actual opening Sho 49-87560 (JP, U) Actual opening Sho 58-55262 (JP, U) Actual opening Sho 59-172963 (JP, U) Actual public Sho 42-5090 (JP, Y1) (58) Fields surveyed (Int.Cl. ⁷ , DB name) F25B 39/02 F25B 39/00 F25B 37/00

Claims (3)

(57) [Claims] 1. A liquid cooling medium is evaporated by dropping the evaporation pipe provided in the vacuum evaporator is used in the absorption cooling machine for cooling air or the like by the heat of vaporization during the evaporation, the liquid In a liquid refrigerant dropping device for storing a refrigerant in a tray and dripping it into the evaporator, a volume per unit depth of the tray becomes closer to the bottom.
Configured to decrease, with bored through holes in the side walls of the tray, provided with liquid guiding plate covering holds an appropriate clearance a through hole, the liquid in the evaporator tubes from the conductor liquid plate A liquid refrigerant dropping device for an absorption type air conditioner, wherein a refrigerant is dropped. 2. The plurality of through holes are formed at substantially equal intervals, and the diameter of each through hole and each gap between each liquid guide plate are made substantially the same. Liquid refrigerant dropping device of absorption type air conditioner. Wherein the through hole absorption cooling machine of the liquid refrigerant dropping device according to claim 1 or 2, wherein the being drilled near the bottom of the tray over.