JPH0415424A - Heater - 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 Field of the Invention The present invention relates to a heater for evaporating a latent heat medium such as a refrigerant and water in a heating device or an exhaust heat recovery device.

2. Prior Art Conventional heaters of this type are shown in FIGS. 2 and 3a, for example.
As shown in b, the heater 1 and the radiator 2 are connected to the outgoing pipe 3 and the returning pipe 4. An evaporative working medium 5 such as Freon or the like sealed inside the pipe is connected in a closed loop and circulated by a pump 6 provided in the return pipe 4, and has been used in heating devices and the like. As shown in FIG. 3, the heater 1 used in the above-mentioned device uses a multi-hole pipe 9 in which a plurality of channels having the same length are arranged in parallel between an upper header 7 and a lower header 8. At the same time, a heating plate 11 having fins 10 is brought into thermal contact with the outside of the multi-hole tube 9, and a gas-liquid separator 12 is arranged at the tip of the upper header 7, and liquid returns from the bottom. The configuration was such that the pipe 13 was connected to the lower header 8.

- By heating the fins 10 in the structure mentioned above,
The working medium 5 in the multi-hole tube 9 is heated and evaporated via the heating plate 11, becoming vapor and flowing into the upper hender 7 along with some liquid.
The liquid enters the gas-liquid separator 12 through the liquid return pipe 13, flows into the lower hender 8 through the liquid return pipe 13, and is heated again in the multi-hole pipe 9. On the other hand, steam passes from the gas-liquid separator 12 through the outgoing pipe 3 to the radiator 2
The water enters the water, condenses, becomes a liquid, and flows into the heater 1 again through the return pipe 4 and the pump 6.

Problems to be Solved by the Invention In such a conventional heater 1, a gas-liquid separator 12 is provided at the end of the upper header 7, and the liquid of the working medium 5 discharged from the upper header 7 is sent to the lower part through a liquid return pipe 13. There were problems such as having to return to the lug, making the configuration complicated and increasing the size.

The present invention solves the above problems, and aims to provide a compact heater with a simple configuration.

Means for Solving the Problems In order to achieve the above object, the present invention provides a multi-hole structure between an upper header and a lower header, which has a short flow path and a long flow path with different flow path lengths in the upper header. In addition to providing a tube, a heat transfer plate is provided between the outer surface of the long flow path of the multi-hole tube and a heating plate having fins.

Effect of the present invention With the above-described configuration, the length of the multi-hole tube is changed in the upper header, and the heat exchanger plate is not in contact with the short flow path, so that the heat exchanger plate is not brought into contact with the short flow path, so that the evaporation inside the multi-hole tube is lifted to the upper header together with the steam. The working medium is returned to the lower header through a short channel section of multi-hole tube located at the bottom of the upper lug. Therefore, since it is not necessary to provide a gas-liquid separator and a liquid return pipe beyond the upper header, the size of the structure can be easily reduced.

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

As shown in the figure, a multi-hole pipe 9 having a plurality of vertical parallel flow paths is provided between the upper header 7 and the lower header 8 to constitute a flow path for the working medium 5. A short flow path 14 and a long flow path 15 having different lengths at the upper open end are connected such that the open end of the short flow path 14 is located at the bottom of the upper header 7, and a working medium 5 is sealed inside. There is. Furthermore, a heat transfer plate 16 is placed between the multi-hole tube 9 and the heating plate 11 having fins 10 so as to be in contact with the long flow path 15 and not in contact with the short flow path 14.
is provided. On the other hand, the outgoing pipe 3 that is piped to the indoor unit 2
is directly connected to the upper header 7, and the return pipe 4 is directly connected to the lower header 4.

In the above configuration, when the fins 10 are heated, the heat passes through the heating plate 11 and further passes through the heat transfer plate 16 to heat and evaporate the working medium 5 in the long flow path 15 of the multi-hole tube 9, and the steam and liquid are transferred to the upper header. 7. The liquid in the upper header 7 falls through the short channel 14, returns to the lower header 8, and is heated again in the long channel 15. On the other hand, steam passes directly from the upper header 7 through the outgoing pipe 3, condenses in the radiator 2, becomes liquid, and is sent to the lower header 8 of the heater 1 through the returning pipe 4 by the pump 6.

As described above, according to the heater of the embodiment of the present invention, there is no need to separately provide a gas-liquid separation pipe and a liquid return pipe, and the construction of the heater as a whole can be easily reduced in size.

Effects of the Invention As described above, according to the heater of the present invention, the following effects can be obtained.

(1) Since the flow path length of the multi-hole pipe is changed in the upper header, the heating section and liquid return section can be provided in the same multi-hole pipe, and the upper header can be operated as a gas-liquid separator. This makes it possible to realize a simple and compact heater.

(2) By providing a heat transfer plate so that it contacts only the long flow path of the multi-hole tube, the liquid can be returned to the lower header without evaporating in the short flow path, allowing stable operation.

[Brief explanation of drawings]

Figures 1a and 1b are perspective views and sectional views of a heater according to an embodiment of the present invention, Figure 2 is a configuration diagram of a heat transfer device using the heater of the present invention and a conventional example, and Figure 3a is a FIG. 3 is a perspective view of a conventional heater, and FIG. 3 is a sectional view taken along the line A-A in FIG. 3a. 5... Working medium, 7... Upper header, 8... Lower header, 9... Multi-hole pipe, 10... Fin, 11... Heating plate,
14... Short flow path, 15... Long flow path, 1
6...Heat transfer plate. Name of agent: Patent attorney Shigetaka Awano
Bee 145 J: Part header bottom spatula - rt - - Heating plate 14 - Short path

Claims (2)

[Claims] (1) an upper header, a lower header, and a multi-hole pipe provided between the upper header and the lower header and having a short flow path and a long flow path with different flow path lengths in the upper header; and a heating plate having fins in contact with the outer surface of the multi-hole tube. (2) The heater according to claim 1, further comprising a heat transfer plate provided between the outer surface of the long flow path of the multi-hole tube and the heating plate.