CN206131448U - Thermal medium electric heater - Google Patents

Abstract

The utility model relates to the technical field of electric heaters, and discloses a heat medium electric heater, which includes a cylinder body, and a plurality of U-shaped sheath tubes are arranged in the cylinder body, and one or more electric heaters are arranged in each U-shaped sheath tube. The heating core, the cylinder body is connected to one side of the heat medium pipe box through the tube plate, the heat medium pipe box communicates with the heat medium expansion tank and contains a heat conduction medium, and the other side of the heat medium pipe box is fixed on the side wall of the junction box; The front end of each U-shaped sheath tube passes through the through hole of the tube plate and is fixed on the tube plate without exceeding the surface of the tube plate; the electric heating core heats the heat medium in the U-shaped sheath tube through electric heating and transfers it to the U-shaped The outer wall of the sheath tube and the U-shaped sheath tube heat the liquid in the cylinder through heat conduction. The utility model utilizes the heat exchange between the sheath pipe and the fluid to avoid production accidents, and at the same time makes the fluid heated evenly, and realizes the effective protection of the safety of the equipment through the thermal medium expansion tank, and at the same time facilitates the generation of residues and other dirt after the thermal medium is reused discharge.

Description

A heat medium electric heater

technical field

The utility model relates to an indirect electric heater, in particular to a thermal medium electric heater.

Background technique

Electric heater is an internationally popular high-quality and long-life electric heating equipment, which is used to raise, keep warm and heat flowing liquid and gaseous media. When the heating medium passes through the heating chamber of the electric heater under pressure, the principle of fluid thermodynamics is used to uniformly take away the huge heat generated by the electric heating element during work, so that the temperature of the heated medium meets the user's process requirements. The internal control system of the electric heater automatically adjusts the output power of the electric heater according to the temperature sensor signal at the output port, so that the temperature of the medium at the output port is uniform; when the heating element is overheated, the independent overheat protection device of the heating element immediately cuts off the heating power to avoid The overheating of the heating material will cause coking, deterioration and carbonization, and in severe cases, the heating element will burn out, which effectively prolongs the service life of the electric heater. Electric heaters have the advantages of small size, convenient installation and use, and long service life, so they are used more and more widely.

At present, this equipment technology is mainly used in dangerous working conditions where the heated medium cannot directly contact the heating element, such as high pressure, flammable, explosive, corrosive, etc.; therefore, the research and development of the structure is of great significance to the indirect electric heater.

Utility model content

The utility model provides a heating medium electric heater, which solves the safety hazards and uneven heating problems of the existing electric heaters.

The utility model can be realized through the following technical solutions:

A heat medium electric heater, comprising a cylinder body, the front end of the cylinder body is provided with an inlet, the rear end is provided with an outlet, and the bottom is provided with a slag discharge port, and a plurality of U-shaped sheath tubes are arranged in the cylinder body, each of the U-shaped One or more electric heating cores are arranged in the shaped sheath tube, and it is characterized in that: the cylinder body is connected to one side of the heat medium pipe box through the tube plate, and the heat medium pipe box communicates with the heat medium expansion tank and contains a heat conduction medium , the other side of the heat medium pipe box is fixed on the side wall of the junction box; the front end of each electric heating core passes through the through hole of the tube plate, passes through the heat medium pipe box, and passes through the side wall of the junction box The through hole extends inside the junction box and is fixed on the side wall of the junction box; the front end of each U-shaped sheath pipe passes through the through hole of the tube sheet and is fixed on the tube sheet without exceeding the tube sheet surface; The electric heating core heats the heat medium in the U-shaped sheath tube through electric heating and transmits it to the outer wall of the U-shaped sheath tube, and the U-shaped sheath tube heats the liquid in the cylinder through heat conduction.

Further, a breathing port is provided at the top of the thermal medium expansion tank, a liquid level switch is provided at the side, and a sewage outlet is provided at the bottom.

Further, each U-shaped sheath tube is further provided with a fixing plate, and the tail end of each electric heating core passes through the through hole of the fixing plate and is fixed on the fixing plate.

Further, the electric heating core is a heating wire heating tube, and the U-shaped sheath tube is made of stainless steel, carbon steel or alloy steel.

The beneficial technical effects of the utility model are:

1. Through the thermal medium breathing port and the high and low liquid level switch on the top of the thermal medium expansion tank, the effective protection of equipment safety is realized, and the thermal medium liquid level indication is also realized, which is convenient for users to observe.

2. There is also a sewage outlet at the bottom of the thermal medium expansion tank to facilitate the discharge of residues and other dirt after the thermal medium is reused.

3. Use the sheath tube to exchange heat with the fluid. The electric heating element is not in direct contact with the heated fluid, which can prevent the electric heating element from breaking under high pressure and corrosion conditions and cause production accidents. The sheath tube itself is made of steel. , the surface heat transfer temperature is uniform, and the heated liquid can be heated evenly.

Description of drawings

Fig. 1 is the working principle schematic diagram of the present utility model;

Fig. 2 is the structural representation of the utility model;

Fig. 3 is a schematic diagram of the internal structure of the sheath pipe of the present invention;

Among them, 1-cylinder, 2-tube plate, 3-heat medium expansion tank, 4-collector box, 5-heat medium pipe box, 6-electric heating core, 7-U-shaped sheath tube, 8-breathing port , 9-liquid level switch, 10-inlet, 11-exit, 12-slag outlet, 13-drainage outlet, 14-fixed plate.

detailed description

Below in conjunction with accompanying drawing and specific embodiment the utility model is described in further detail.

As shown in Figure 1 and Figure 2, a heat medium electric heating mainly includes a cylinder body 1, a tube plate 2, a heat medium expansion tank 3, an explosion-proof junction box 4, a heat medium pipe box 5, an electric heating core 6 and a U-shaped protective cover. Sleeve 7 and other structures.

An inlet 10 is provided at the front end of the cylinder body 1, an outlet 11 is provided at the rear end, and a slag discharge port 12 is provided at the bottom, and a plurality of U-shaped sheath tubes 7 are arranged inside, and one or more electric heating cores are arranged inside each U-shaped sheath tube 7 6. The cylinder body 1 is connected to one side of the heat medium pipe box 5 through the tube plate 2. The heat medium pipe box 5 communicates with the heat medium expansion tank 3 and contains a heat conduction medium. The other side of the heat medium pipe box 5 is fixed to the junction box 4; the front end of each electric heating core 6 passes through the through hole of the tube plate 2, passes through the heat medium tube box 5, and extends through the through hole of the side wall of the junction box 4 into the junction box 4 and is fixed in the junction box 4. On the side wall of the junction box 4; the front end of each U-shaped sheath pipe 7 passes through the through hole of the tube sheet 2 and is fixed on the tube sheet 2 without exceeding the surface of the tube sheet 2.

As shown in Figure 3, due to engineering needs, when the cylinder body 1 is relatively long or the electric heating core 6 is relatively long, a fixing plate 14 can be arranged inside the tail end of each U-shaped sheath tube 7 to support the fixed electric heating core 6. , in case the electric heating core 6 is bent due to being too long.

Heat medium expansion tank 3 is mainly used to store heat conduction medium (such as heat conduction oil). Before heating, heat medium pipe box 5 and U-shaped sheath pipe 7 are filled with heat medium. Electric heating core 6 is installed in U-shaped sheath pipe 7, after work, the electric heating core 6 exchanges heat with the heat medium, and the heated heat medium transfers heat to the outer surface of the U-shaped sheath tube 7, and the U-shaped sheath tube 7 heats the liquid in the cylinder body 1 through heat conduction. heating. After the heat medium is heated and expanded, it will enter the heat medium expansion tank 3. The heat medium breathing port 8 is installed on the top of the heat medium expansion tank 3, and a high and low liquid level switch 9 is installed at the same time, so as to effectively protect the safety of the equipment and also realize the protection of the heat medium. Medium liquid level indication, easy to observe. A sewage outlet 12 is provided at the bottom of the heat medium expansion tank 3 to facilitate the discharge of dirt such as residues generated after the heat medium is reused.

When the fluid enters the equipment from the cylinder inlet 10 at a certain flow rate, it fully contacts with the U-shaped sheath tube 7 and then performs heat exchange. After the fluid staying for a certain period of time is heated to a certain temperature, it flows out from the cylinder outlet 11. There is a slag outlet at the bottom of the body to facilitate the discharge of residues in the fluid during cleaning and heating. A temperature transmitter is installed at the outlet 11 of the barrel, which can realize automatic temperature control through the control system. At the same time, the electric heating element is equipped with a temperature switch to protect the electric heater from overheating.

The heat exchange between the sheath tube and the fluid is used, and the electric heating element does not directly contact the heated fluid, which can avoid production accidents caused by the rupture of the electric heating element under high pressure and corrosion conditions. The sheath tube itself is made of steel, and the surface The heat transfer temperature is uniform, so the heated liquid can be heated evenly.

Although the specific embodiments of the present utility model have been described above, those skilled in the art should understand that these are only examples, and various modifications can be made to these embodiments without departing from the principle and essence of the present utility model. Change or modification, therefore, the protection scope of the utility model is defined by the appended claims.

Claims (4)

1. a kind of thermal medium electric heater, including cylinder, the barrel front end opens up import, and rear end opens up outlet, and bottom opens up Slag-drip opening, it is characterised in that：Multiple U-shaped protecting pipes are set in the cylinder, arrange in each described U-shaped protecting pipe one or Multiple electrical heating cores, the cylinder is connected by tube sheet with thermal medium bobbin carriage side, and the thermal medium bobbin carriage and thermal medium expand Tank is communicated and built with heat-conducting medium, and the thermal medium bobbin carriage opposite side is fixed on the side wall of line concentrating case；Each described electricity adds The front end of hot core extend in line concentrating case through the through hole of tube sheet, by thermal medium bobbin carriage, through the through hole of line concentrating case side wall and It is fixed on the wall of line concentrating case side；The front end of each U-shaped protecting pipe through tube sheet through hole be fixed on tube sheet and without departing from Tube sheet plate face；The electrical heating core is heated and is delivered to outside U-shaped protecting pipe by electrical heating to the thermal medium in U-shaped protecting pipe Wall, the U-shaped protecting pipe is heated by conduction of heat to the liquid in the cylinder.

2. thermal medium electric heater according to claim 1, it is characterised in that：The thermal medium expansion upper end is opened up exhales Suction inlet, side arranges liquid-level switch, and bottom opens up sewage draining exit.

3. thermal medium electric heater according to claim 1, it is characterised in that：Also set up in each described U-shaped protecting pipe Fixed plate, the tail end of each electrical heating core passes through the through hole of fixed plate and is fixed in fixed plate.

4. the thermal medium electric heater according to one of claim 1-3, it is characterised in that：The electrical heating core is heater strip Pattern heating tube, the U-shaped protecting pipe is rustless steel, carbon steel or alloy steel material.