JPH05322375A - Film type heat transfer device - Google Patents

Abstract

PURPOSE:To obtain a film type heat transfer device in which solution is not irregularly located even if a heat transfer unit is inclined. CONSTITUTION:A film type heat transfer device has a plurality of heat transfer tubes having straight tube parts and a liquid sprinkler 3 at an upper part of the tubes, and comprises a plurality of deflectors 4 between the upper and lower tubes. Each deflector 4 has a shape in which a width in contact with the upper tube is wide and a width in contact with the lower tube is smaller than a diameter of the tube.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a heat transfer device, and more particularly to a liquid film type heat transfer device having a liquid spraying device on the upper part thereof. And such a heat exchanger is adopted as a generator, an absorber, an evaporator, etc. of an absorption refrigerator.

[0002]

2. Description of the Related Art When an absorption refrigerating machine is used for a vehicle, the equipment is often used in a tilted state. In such a case, in the conventional ordinary absorption refrigerating machine, when the heat transfer pipe is inclined in the straight pipe direction, the sprayed liquid is biased in one direction of the heat transfer device, and the predetermined heat transfer cannot be expected.

[0003]

DISCLOSURE OF THE INVENTION The present invention provides a liquid film type heat transfer device capable of preventing the sprayed liquid from deviating in one direction even if the device is tilted, and an absorption refrigerator using the same. The purpose is to provide.

[0004]

In order to achieve the above object, according to the present invention, a plurality of heat transfer tubes having straight pipe portions and a liquid film type heat transfer device having a liquid spraying device above the heat transfer tubes. In the above, a plurality of baffle plates are provided between the heat transfer tubes which are in a vertical relationship, and the shape of the baffle plate is wide in contact with the upper heat transfer tube, and the width in contact with the lower side is larger than the diameter of the heat transfer tube. It is also a liquid film type heat exchanger characterized by being made smaller.
Further, in order to achieve the above-mentioned other objects, in the present invention, a generator, an absorber, an evaporator, a condenser, a solution heat exchanger as a main component equipment, these are connected by a solution pipe, a refrigerant pipe, a cycle. In the absorption chiller to be configured, the absorption chiller is configured by using the liquid film type heat exchanger as a heat transfer device used for them.

Next, the present invention will be described in detail. In the baffle plate provided in the present invention, in order to maintain a good liquid distribution, the width of the portion of the baffle plate which is in contact with the lower tube is smaller than the diameter of the tube, and preferably 1/2 or less of the diameter. Is good. The number of baffle plates is preferably as large as possible, but it is preferable that at least a larger number than the upper and lower stages of the tubes be provided between the two tubes. The baffles may be in contact with the upper and lower tubes, or one or both of them may be adhered to the tubes. It may also be integrated with the tube. The heat transfer tube is a pin-shaped fin processed to spread the liquid well or to improve the heat transfer, and the baffle plate is in contact with the pin at the pin portion. May be.

[0006]

According to the present invention, by reducing the width of the portion of the baffle plate provided between the heat transfer tubes and in contact with the lower tube, the liquid collected in the upper tube is near the top of the lower tube. The surface area of the heat transfer tube can be effectively used. If the diameter is larger than the diameter, it is not supplied to the heat transfer tube and may drop as it is, which deteriorates heat transfer efficiency.

[0007]

The present invention will be specifically described below with reference to the drawings, but the present invention is not limited to these embodiments. Example 1 FIG. 1 shows an example of the liquid film heat exchanger of the present invention. 1 is a front sectional view, 2 is a heat transfer tube, 3 is a liquid distribution tube, 4 is a baffle plate, a fluid 5 is flowing in the heat transfer tube 2, and a solution 7 from the liquid distribution tube 3 Heat exchange. FIG. 2 shows an enlarged view of part A of FIG. 1, and FIG. 3 shows a sectional view of FIG. As described above, a large number of baffle plates 4 are provided between the upper and lower sides of the heat transfer tube 2, and the structure thereof has a trapezoidal shape as shown in FIG. The short side is provided in contact with the lower heat transfer tube.

FIGS. 4 and 5 show the flow of liquid when the heat transfer device is inclined. FIG. 4 shows the flow of the liquid when the heat transfer device is inclined in the left-right direction of the heat transfer pipe. According to this, the liquid is dammed by the baffle plate and flows down to the heat transfer pipe below. FIG. 5 shows the flow of the liquid when the heat transfer device is inclined in the front-back direction of the heat transfer pipe, and the liquid flows along the baffle plate and spreads over the entire heat transfer pipe. Further, this baffle plate may be processed into a corrugated cross-sectional shape, which makes it possible to improve the dispersibility of the liquid at the time of inclining in the lateral direction. When the tube and the baffle plate are manufactured separately, a spacer may be placed in the baffle plate to connect the baffle plates sideways. Further, the baffle plate may have a shape as shown in FIGS. In FIG. 6, a side plate is provided also as a spacer,
Droplets that fly in the lateral direction are collected, and in FIG. 7, baffle plates are attached to the top, bottom, left and right to form a single sheet, and a plurality of sheets are provided in the longitudinal direction of the tube.

Embodiment 2 FIG. 8 shows an example in which the liquid film type heat exchanger of the present invention is used as a generator of an absorption refrigerator. FIG. 8 is a flow configuration diagram of an absorption refrigerator, G is a generator, A is an absorber, E is an evaporator, C is a condenser, Hs is a solution heat exchanger, Hc is a refrigerant heat exchanger, 20, 21
Is a pump, pipes 11 to 14 are solution passages, and pipes 15 to 19 are refrigerant passages. The generator G has a solution spraying pipe 3 on the upper part thereof, and is composed of a heat transfer pipe 2 and a baffle plate 4 provided therebetween. As the baffle plate, the one shown in Example 1 was used. In the cooling operation of this device, the diluted solution that has absorbed the refrigerant passes from the absorber A through the pipe 11 and the pump 20.
The diluted solution, which is sent to the heated side of the solution heat exchanger Hs and heated by the heat exchange, passes through the pipe 12 and is sprayed onto the heat transfer pipe 2 from the spray pipe 3 above the generator G. Hot water 5 passes through the heat transfer tube 2 and heats the dilute solution flowing down the outer surface of the heat transfer tube to generate refrigerant vapor. Further, since the heat transfer tubes are provided with baffle plates vertically, the generator G
Even if is inclined, the solution does not shift to one side and can flow down the entire heat transfer tube, improving heat transfer efficiency.

The concentrated solution produced by generating the refrigerant vapor is concentrated in the tube 1.
3 through the heating side of the heat exchanger Hs to pipe 14 to absorber A
Is introduced into the pipe 11 and absorbs the refrigerant again to form a dilute solution.
Take a cycle that circulates from. On the other hand, the refrigerant vapor generated in the generator G is introduced into the condenser C from the pipe 15, condensed, and introduced into the evaporator E from the pipe 16 through the expansion valve 22. The refrigerant liquid introduced into the evaporator E passes from the pipe 17 to the heated side of the refrigerant heat exchanger Hc by the pump 21, takes heat from the cold air and is heated to reach the evaporator E from the pipe 18, and the refrigerant heat exchange is performed. The refrigerant is evaporated by the amount of heating in the vessel, and the rest is circulated from the pipe 17. Then, the refrigerant vapor is introduced from the pipe 19 into the absorber A, absorbed in the solution, and circulated. In this example, the liquid film heat exchanger of the present invention is used for the generator, but it can be used for the absorber A and the evaporator E as well as the generator.

[0011]

According to the present invention, since the baffle plate is provided between the heat transfer tubes and the width of the baffle plate is made smaller than the diameter of the heat transfer tube, the heat transfer device is inclined to the left, right, front and back. Even so, the liquid flowing along the heat transfer tube flowed down over the whole without being biased to one side, and the heat transfer efficiency was improved.

[Brief description of drawings]

FIG. 1 is a front sectional view of a liquid film type heat exchanger of the present invention.

FIG. 2 is an enlarged view of part A in FIG.

FIG. 3 is a side sectional view of FIG.

FIG. 4 is an explanatory diagram of a liquid flow when the heat transfer device is inclined in the left-right direction.

FIG. 5 is an explanatory diagram of a liquid flow when the heat exchanger is inclined in the front-rear direction.

FIG. 6 is a partial side sectional view of a heat transfer device showing an example of the present invention.

FIG. 7 is a partial side sectional view of a heat transfer device showing an example of the present invention.

FIG. 8 is a flow configuration diagram of an absorption refrigerator.

[Explanation of symbols]

1: Heat transfer device, 2: Heat transfer pipe, 3: Liquid distribution pipe, 4: Baffle plate,
9: Side plate, 11-14: Solution pipe, 15-19: Refrigerant pipe, G: Generator, A: Absorber, C: Condenser, E: Evaporator, Hs: Solution heat exchanger, Hc: Refrigerant heat exchange vessel

─────────────────────────────────────────────────── ───

[Procedure amendment]

[Submission date] March 26, 1993

[Procedure Amendment 1]

[Document name to be corrected] Drawing

[Correction target item name] All drawings

[Correction method] Change

[Correction content]

[Figure 1]

[Fig. 2]

[Figure 3]

[Figure 4]

[Figure 5]

[Figure 6]

[Figure 7]

[Figure 8]

Claims (3)

[Claims] 1. In a liquid film type heat exchanger having a plurality of heat transfer tubes having a straight pipe section and a liquid spraying device above the heat transfer tubes, there is a hindrance between the heat transfer tubes which are vertically arranged. A liquid film heat exchanger characterized in that a plurality of plates are provided, and a shape of the baffle plate has a wide width in contact with the upper heat transfer tube and a width in contact with the lower side is smaller than a diameter of the heat transfer tube. 2. The liquid film heat exchanger according to claim 1, wherein the heat transfer tube has pin-shaped fins on its surface. 3. An absorption refrigerator in which a generator, an absorber, an evaporator, a condenser, and a solution heat exchanger are main components, and these are connected by a solution pipe and a refrigerant pipe to form a cycle,
An absorption refrigerator comprising the liquid film heat exchanger according to claim 1 as a heat transfer device.