JPS61184358A - Heater for heat exchanger - Google Patents

Abstract

PURPOSE:To provide a heater for heat exchanger which may not affect a bad influence to the heater but may make an efficient heating operation by a method wherein a taking-out port for taking out the thermal medium liquid of a main body of a rectangular tank is arranged over the main body and in turn an electric heater is arranged below the main body. CONSTITUTION:Thermal medium liquid heated by an electric heater 24 is ascended up to the lower surface of a partition wall 22 of a lower chamber 20B and the thermal medium liquid is distributed downwardly in sequence from a hot thermal medium liquid to a cold thermal medium liquid, the hot thermal medium liquid is sucked in sequence from the taking outport 20b by a circulation pump 14 and then circulated in the circulation pipe line. In turn, the thermal medium liquid circulated in the circulation pipe line is flowed from the flowing-in port 20a into the upper chamber 20A of the heater 10. Then, the thermal medium liquid stored in the upper chamber 20A shows a decreased flow speed and as shown by an arrow A, the thermal medium liquid is gradually flowed down to the base part of the electric heater 24 through the communication hole 22a and heated there.

Description

Detailed Description of the Invention (Industrial Field of Application) The present invention relates to a heater for a heat exchanger, and more particularly, it uses a liquid with a high boiling point, low melting point, and small specific heat, such as ethylene glycol, as a heat medium liquid. The present invention relates to a heater for a heat exchanger that can heat efficiently.

(Prior Art and Problems) The inventor of this invention proposed a heater 10 as shown in FIG.
, a fluid with a high boiling point, low melting point, and small specific heat, such as ethylene glycol, triethylene glycol, etc., is sealed in the pipe line including the heat radiation part 12 and the expansion chamber 16 by the circulation pump 14 as a heat medium liquid, and strong circulation is performed. proposed a heat exchanger. The heat medium liquid of this heat exchanger has a high boiling point, so it can be heated to a high temperature and has good efficiency, and has a small specific heat, so it has effects such as quick rise.

Moreover, FIG. 5 shows the heater IO of the heat exchanger. A U-shaped flow path 10b for heat medium liquid is formed in the casing 10a, and a heater 11 is disposed in the flow path 10b. In this heater 10, the heat medium liquid flows little by little in the flow path 10b, and the heat medium liquid can be rapidly heated to a high temperature.

However, when the temperature of a heat transfer liquid such as ethylene glycol decreases, the viscosity increases and fluidity becomes extremely poor. Therefore, in a heat exchanger that uses ethylene glycol or the like as a heat transfer liquid, if the heat source is turned on for use after the outside air has dropped and the flowability of the heat transfer liquid has deteriorated, the circulation pump will become overloaded. As a result, the circulation of the heat medium liquid becomes poor, and only the heat medium liquid in the heating section is partially heated, which may have an adverse effect on the heater, or a temperature fuse attached to the heater may be installed to prevent harm to the heater. A problem arises in that the heat exchanger becomes unusable due to the activation of the protective device.

In addition, in the above heat exchanger, it is necessary to keep the flow rate of the heater 10 constant in order to keep the heating temperature of the heat medium liquid constant, but as the size of the heat radiating part 12 changes, the flow rate of the heat medium liquid changes. As the total amount of liquid changes, the discharge amount of the pump also changes. Therefore, due to changes in the total amount of heat transfer liquid, heater 1
It is necessary to adjust the calorific value of the pump 1 and the discharge amount of the circulation pump 14. Such adjustment is a complicated task, and a versatile heater is desired.

As a result of extensive research, the inventor found that when a heat transfer liquid such as ethylene glycol, which has a high boiling point, low melting point, high viscosity, and low specific heat, is heated inside a cylindrical casing, a high temperature rises in the upper part of the casing. Since extremely high temperature parts are unevenly distributed, especially in the center part, it was discovered that if the high temperature heat transfer liquid from the upper part of the casing was taken out and circulated to the heat dissipation part, the start-up would be faster and heat exchanged more efficiently. Ta.

This invention was made in view of the above circumstances, and it partially heats a heat transfer liquid such as ethylene glycol, which has a high boiling point, a low melting point, and a small specific heat, without giving a bad FW to the heater, and efficiently. The purpose is to provide a heater for a heat exchanger that can be heated.

(Means and operations for solving the problems) A heater for a heat exchanger according to the present invention has the following structure for solving the above problems.

In a heater for a heat exchanger that heats a heat medium liquid such as ethylene glycol that has a high boiling point, low melting point, high viscosity, and low specific heat, an outlet for taking out the heat medium liquid from the main body 20, which is a tank in the form of a housing. 20b is provided in the upper part of the main body 20, while the electric heater 24 is provided in the lower part.

Therefore, the heat medium liquid heated by the electric heater 24 rises to the upper part of the main body 20, and this rising heat medium liquid with good fluidity is sequentially sucked out from the outlet 20b by the circulation pump.

(Embodiments) Hereinafter, preferred embodiments of the present invention will be described in detail based on the drawings.

In FIG. 2, similarly to the conventional example, 10 is a heater;
12 is a radiator, and 14 is a circulation pump.

These heating section 10, circulation pump 14, and heat radiation section 12 are connected in series through a pipe 18 to form one circulation pipe. A liquid such as ethylene glycol, which has a high boiling point, a low melting point, and a small specific heat, and whose viscosity increases at low temperatures, is sealed in this circulation pipe as a heat transfer liquid.

FIGS. 1a and 1b are cross-sectional views showing the heater 10. FIG.

A main body 20 of the rectangular parallelepiped heater is connected to an upper chamber 2 by a partition wall 22.
It is divided into two chambers: 0A and a lower chamber 20B.

Two electric heaters 24 are provided in the lower part of the royal chamber 20B along the bottom of the lower chamber 20B. This electric heater 24
passes through the side view 2Qc of the lower chamber 20B and extends U in the longitudinal direction.
It extends in a letter shape, and the bottom surface 20d of the royal house 20B.
are arranged parallel to each other. In addition, the partition wall 22 at the base of the electric heater 24 includes a royal room 20B and an upper room 20B.
A communication hole 22a communicating with A is provided, and a heat medium liquid outlet 20b is provided at the top of the royal chamber 20B in the direction toward the tip of the electric heater 24.

Projecting side surface 20c of the electric heater 24 of the upper chamber 20A
A heating medium liquid inlet 20 is provided at the upper part of the side surface 20e facing the
a is provided and connected to the suction port 14a side of the circulation pump 14 via a pipe 18a. Further, a space 26 is formed in the upper part of the upper chamber 2OA, and an air hole 20f is opened in the upper surface of the upper chamber 20A, so that even if the heat transfer liquid expands due to heating, it is absorbed in the space 26. The space 26 maintains atmospheric pressure by the air holes 20f.

The heater 10 of this embodiment is configured as described above.

Therefore, when the electric heater 24 is powered on, the heat medium liquid heated by the electric heater 24 is transferred to the partition wall 20B of the royal room 20B.
2 rises to the bottom surface, and the high temperature heat medium liquid is sequentially distributed downward from the low temperature heat medium liquid, and the high temperature heat medium liquid is sequentially sucked out from the outlet 20b by the circulation pump 14 and flows inside the circulation pipe. circulate. On the other hand, the heat medium liquid that has circulated through the circulation pipe is transferred from the inlet 20a to the upper chamber 20A of the heater 10.
flows into. Then, the heat medium liquid stored in the upper chamber 20A is stored and the flow velocity is reduced, and as shown by arrow A, the heat medium liquid gradually flows down through the communication hole 22a to the base of the electric heater 24, and is heated in the same manner as above. be done.

Further, the heat medium liquid that has been heated and has risen to the lower surface of the partition wall 22 of the royal room 20B heats the heat medium liquid stored in the upper chamber 20A via the partition wall 22, so that wasteful release of heat can be prevented.

Further, since the two-stage structure is adopted, the heated heat transfer liquid can be effectively taken out without forming a space above the lower chamber 20b.

As mentioned above, the heat transfer liquid such as ethylene glycol is distributed downward in order from high temperature to low temperature in the upper part of the casing. It may also be formed into the shape shown by the two-dot chain line in the middle. Furthermore, it is preferable that the partition wall 22 be formed so as to rise slightly toward the distal end of the electric heater 24.

Furthermore, an inclined surface 20g may be formed at the tip of the electric heater 24 in the lower chamber 20B to smooth the flow of the heat medium liquid from the outlet 20b.

Figures 3a and 3b show another embodiment of the heater.

The heater IO includes an electric heater 3 at the bottom of a housing-like main body 30.
4, and an inlet 30a for the heat medium liquid is formed in the lower part of the main body 30.

In addition, a heat transfer liquid outlet 30b is formed in the upper part of the main body 30, and the heat transfer liquid is passed through the suction port 1 of the circulation pump 14 through the pipe 18a.
It is connected to the 4a side.

In addition, a slight space 24 is formed in the upper part of the main body 30, and an air hole 30f is opened in the upper surface of the main body 30, so that even if the heating medium liquid expands due to heating, it is absorbed in the space 36. 36 maintains atmospheric pressure through air holes 30f.

The heater 10 shown in FIG. 3 includes a main body 30, an electric heater 34, and an inlet 30a formed in the same manner as in FIG. 3a. On the other hand, the heat medium liquid outlet 30b is
It is formed at the uppermost end of the side surface of the main body 30, and is connected to the suction port 14a side of the circulation pump 14 via a pipe 18a. Further, an expansion chamber (not shown) is provided at an appropriate position in the circulation circuit or directly in the main body 30 of the heater 10.

Therefore, since there is no space above the main body 20, it is possible to sequentially take out the hot heat transfer liquid that has gathered at the top.

When the heater 10 configured as described above is incorporated into a heat exchanger, even if the power is turned on when the outside temperature is low and the fluidity of the heat transfer medium is extremely poor, the heater will not heat the fluid. The circulation pump sucks out the highly fluid heat transfer liquid that accumulates on the top of the heater from the outlet of the heater and pumps it into the circulation pipe, so the circulation pump is not overloaded and damaged. Nor. Moreover, the fluidity of the heat transfer liquid can be ensured at the time of startup, and it can be made to flow smoothly in the circulation pipe, so that the startup is extremely quick and a predetermined circulation amount can be ensured.

Further, since fluidity of the heat transfer liquid can be ensured even at low temperatures, the circulation pump can be small-sized, and costs can be kept low.

Furthermore, when the positions of the heater 10 and the circulation pump 14 of the present invention are reversed, when the heat medium liquid pushed out from the pump is sent into the heater, the heat medium liquid is If the flow rate is set to a level that does not cause turbulence, the same effects as in the above embodiment can be achieved.

Although the present invention has been described above with reference to preferred embodiments, the present invention is not limited to this embodiment, and the structure of the heater is not particularly limited. Although a heater was used, this electric heater may be one that uses dielectric heating or induction heating in addition to resistance heating.
Furthermore, it goes without saying that many modifications can be made without departing from the spirit of the invention, such as using not only an electric heater but also other heat sources such as gas, kerosene, etc.

(Effects of the Invention) Thus, according to the present invention, the heater is formed in the shape of a housing, and the electric heater is provided at the bottom, so that the heated heat medium liquid gradually rises and partially heats up. There is no heating of the medium liquid. In addition, since the high-temperature heat transfer liquid that has been heated, rises, and has improved fluidity is sequentially sucked out by the circulation pump from the outlet provided at the top, the circulation pump is not overloaded and efficient heating is possible. It can be carried out.

Furthermore, the expansion chamber and heater can be formed integrally,
This has great effects such as making the entire device more compact.

[Brief explanation of the drawing]

Figures 1a and b are longitudinal and cross-sectional views of a heater showing a preferred embodiment of the present invention, Figure 2 is an explanatory diagram of the circulation pipe of the heat exchanger, and Figures 3a and b are A sectional view of another heater, FIG. 4 is an explanatory diagram of a circulation pipe of a conventional heat exchanger, and FIG. 5 is a sectional view showing a conventional heater. 10... Heater, 10a... Casing, 10b.
...Flow path, 11... Heater, 12... Heat radiation part, 14
... Circulation pump, 16... Expansion chamber, 18.18a.
...Pipe, 20...Main body, 20A...Upper chamber, 20B.
...lower chamber, 20a...inlet, 20b...outlet, 20c, 20e...side, 20d...bottom, 2
0f...air hole, 20g...(around slope, 22...
Partition wall, 22a communication hole, 24... electric heater, 26...
・Space, 30...Main body, 30a...Inlet, 30f
... Air hole, 30b... Outlet, 34... Electric heater, 36... Space.

Claims (1)

[Claims] 1. A heater for a heat exchanger that heats a highly viscous heat medium liquid having a high boiling point and a low melting point in a tank, characterized by providing an outlet for taking out the heat medium liquid from the upper part of the tank. heat exchanger heater.