JP2022019059A - Gas heating device - Google Patents

Abstract

To provide a gas heating device that is suitable as a heating element for heating a gas and can cope with a plurality of heating capacities by solving a problem in which, in a conventional sheath heater, it is necessary to set a facing area between an electric heater of a heat generating unit and the inner peripheral surface of a metal tube as wide as possible, and therefore, when a plurality of heat generating units are connected to each other, it is necessary to deploy each of the heat generating units on a flat surface; however, if this configuration is applied to the gas heating device, not only a storage container becomes large, but also most of the heat generated by the heating element heats the storage container, which causes inconvenience.SOLUTION: A heating element that heats gas uses a heating unit 3 to which an even-numbered row of heating wire is attached so as to be parallel to a plate-shaped insulating plate, and a holder 6 that holds at least three of these heating units to constitute a composite in which the plurality of heat generating units are three-dimensionally assembled.SELECTED DRAWING: Figure 5

Description

The present invention relates to a gas heating device provided in a passage of a gas such as air and heating the gas flowing in the air.

A conventional gas heating device of this type is known to have a storage container portion in which the passage area is widened is provided in the middle of a gas passage, and a heating element such as an electric heater is provided in the storage container portion. Then, while the gas flows through the storage container portion, the heat energy from the electric heater is transferred to the gas to heat the gas.

When it is necessary to change the heating capacity of the gas heating device according to the flow rate of the gas to be heated, create multiple types of electric heaters with different lengths of electric heaters for each heating capacity to meet the required heating capacity. A suitable electric heater was stored in the storage container.

On the other hand, although it is an invention relating to a sheath heater in which an electric heater is housed in a metal tube, a heat generating unit in which an electric heater is attached to a plate-shaped insulating plate is provided, and two heat generating units are held in parallel. It is known that the metal tube is stored in a metal tube in a state of being connected by using a tool (see, for example, Patent Document 1).

Japanese Unexamined Patent Publication No. 2018-6041 (FIG. 9, FIG. 10, FIG. 20)

In the one described in Patent Document 1 relating to the sheath heater, the metal tube itself is heated by a heat generating unit from the inside to heat the metal tube itself to a high temperature, instead of flowing a gas into the metal tube to heat the flowing gas. Used to heat others on the outer surface of the tube. Therefore, it is necessary to set the facing area between the electric heater of the heat generating unit and the inner peripheral surface of the metal tube as wide as possible. Therefore, when connecting a plurality of heat generating units, it is necessary to set them on a flat surface. Each heating unit needs to be deployed. Therefore, the holder for connecting the heat generating units to each other needs to connect the two heat generating units in the 180 degree direction.

However, if the heating unit is deployed in the horizontal direction in this way, if it is used as a heating element for a gas heating device, not only will the storage container become larger, but most of the heat generated by the heating element will heat the storage container. , Inconvenience occurs.

Therefore, in view of the above problems, it is an object of the present invention to provide a gas heating device that is suitable as a heating element for heating a gas and that can cope with a plurality of heating capacities.

In order to solve the above problems, the gas heating device according to the present invention is provided in the middle of the gas passage, and is housed in a storage container portion that isolates the gas flowing inside and the outside, and is stored in the storage container portion and energized. In a gas heating device equipped with a heating element that heats the gas flowing in the storage container portion by generating heat, an even row of heating wires is attached to the heating element so as to be parallel to the plate-shaped insulating plate. It is characterized in that it is composed of a composite in which a plurality of heat generating units are three-dimensionally assembled by using a heat generating unit and a holder for holding at least three of the heat generating units.

In the above configuration, since at least three holders for connecting a plurality of heat generating units are connected, each heat generating unit can be connected to the enemy in a three-dimensional manner, the gas can be efficiently heated, and further, heat generation can be performed. The heating capacity can be freely adjusted by increasing or decreasing the number of units.

It should be noted that the heating wires in the even-numbered rows of the heating unit are configured so that the two rows are connected to each other and all the heating wires are connected in series and power is supplied from one end side, so that the wiring for power supply is one end. Can be put together on the side.

Further, a plurality of types of heat generation units having different heat generation amounts due to differences in at least one of the number of rows of heat generation lines and the cross-sectional area of the heat generation unit are provided, and the most heat generation amount is in the central portion of the three-dimensionally assembled complex. By arranging a large heat generating unit and arranging the heat generating unit so that the amount of heat generated gradually decreases toward the outside, the gas flowing in the complex can be efficiently heated and the amount of heat radiated to the outside is suppressed. can do.

Further, the heating capacity can be further finely adjusted by configuring the complex constituting the heating element to include a blank material to which the heating wire is not attached.

In this case, if the blank material is arranged on the outer periphery of the complex and a heat insulating layer is formed between the wall surface of the storage container and the complex, the heat energy generated by each heat generating unit is not a storage container but a gas. Can be communicated to.

As is clear from the above description, the present invention can efficiently heat the gas and can freely adjust the heating capacity.

The figure which shows the structure of one Embodiment of this invention. Top view showing the details of the heating unit Perspective view showing the heating unit and the holder Side view of heat generation unit The figure which shows the structure of the heating element in the case of using the holder which holds four heat generating units. The figure which shows the structure of the heating element in the case of using the holder which holds three heat generating units. The figure which shows the structure of the heating element in the case of using the holder which holds 6 heat generating units. A plan view showing an example in which four rows of heating wires are attached to a heating unit.

Hereinafter, a case where the present invention is applied to a warm air generator will be described by taking air as an example of the gas to be heated. With reference to FIG. 1, reference numeral 1 denotes a gas heating device according to the present invention, and the gas heating device 1 is attached in the middle of an air passage A sent from a blower BL. This gas heating device 1 is housed in a storage container portion 11 through which air flows, and is stored in the storage container section 11, and converts electric power supplied from the power supply section PS into heat energy to convert the inside of the storage container section 11 into heat energy. It is composed of a heating element 2 that heats the flowing air.

The heating element 2 is configured by assembling a plurality of heat generating units 3 shown in FIG. 2. With reference to FIG. 2, the heat generating unit 3 includes an insulating plate 4 composed of a plate-shaped insulator having heat resistance, and two rows of heating wires attached along the length direction of the insulating plate 4. It is equipped with 5. The insulating plate 4 is provided with a large number of rectangular slits 41 that are long in the direction perpendicular to the longitudinal direction, that is, in the width direction, and the heating wire 5 is attached so as to sew the insulating plate 4 through the slits 41. Has been done. When one end of the insulating plate 4 is 3A and the other end is 3B, both heating wires 5 are connected to each other by a short-circuit plate 32 composed of a plate-shaped conductor at the other end 3B, and from the one end 3A side. It is configured to receive power from the power supply unit PS via the electric wire 31. The heating wire 5 may be a wire rod having a circular cross section or a braided wire having a plurality of fine wires, but in the present invention, a flat ribbon-shaped wire is used.

With reference to FIGS. 3 and 4 together with FIG. 2, bolts 33 are used to fix the heating wire 5. An elongated hole 33a is formed in the bolt 33, and the bolt 33 is inserted into the insulating plate 4 from below, and the heating wire 5 is inserted into the elongated hole 33a on the upper surface side of the insulating plate 4. In that state, the nut 34 is screwed into the bolt 33, the heating wire 5 is sandwiched between the insulating plate 4 and the nut 34, and at the same time, the bolt 33 is fixed to the insulating plate 4.

In that state, the short-circuit plate 32 is attached to the bolt 33, and the nut 34 is further screwed into the bolt 33, whereby the short-circuit plate 32 is sandwiched between the two nuts 34 from above and below and fixed. With this configuration, the heating wire 5 and the short-circuit plate 32 are electrically connected. In the explanation so far, the configuration on the other end 3B side has been described, but on the one end 3A side, the terminal attached to the tip of the electric wire 31 is sandwiched from above and below by two nuts 34 instead of the short circuit plate 32.

Then, the heat generating unit 3 configured in this way is held by the holder 6 shown in FIG. The holder 6 has four grooves 6a that open in a direction perpendicular to the axis of the shaft body 61, and one holder 6 can hold four heat generating units 3. ..

An example of the gas heating device 1 using the holder 6 for holding the four heat generating units 3 will be described with reference to FIG. In this configuration, in addition to the heating unit 3, the first blank material 71 having the same dimensions as the insulating plate 4 of the heating unit 3 but not to which the heating wire 5 is attached, and the heating wire 5 are not attached as well. The three-dimensional heating element 2 is formed by using the second blank material 72 having a narrow width dimension. In this example, four heat generating units 3 are used for each of the upper and lower parts, but if the heating capacity is to be lowered, some heat generating units 3 may be replaced with the first blank material 71. On the contrary, when increasing the heating capacity, a part or all of the blank material 72 having three upper and lower stages may be replaced with the heat generating unit 3. However, the blank materials 72 above and below the replaced portion are also replaced with the blank material 71. In this case, since the horizontal dimension becomes long, the storage container portion 11 is also replaced, or the storage container portion 11 having a size that can cope with such an increase in the horizontal dimension is used in advance.

In the illustrated configuration, the outside of the heating element 2 was covered with blank materials 71 and 72 to which the heating wire was not attached. With this configuration, a space for heat insulation is secured between the blank materials 71 and 72 and the storage container portion 11, so that the heat energy generated by each heat generating wire 5 attached to the heat generating unit 3 is efficiently generated. Can be transmitted to the air.

By the way, in the above embodiment, the holder 6 provided with four grooves 6a is used, but the number of the grooves 6a is not limited to four. For example, FIG. 6 shows a configuration when a holder 6 having three grooves 6a is used. In this configuration, the heat generating unit 3 three-dimensionally configures a hexagonal passage to heat the air flowing in the passage. Further, in this configuration, the entire surface of the heating element 2 is not covered with the blank materials 71 and 72, but a part thereof is covered.

Then, in the present embodiment, the width dimension and thickness of the heating wire attached to the insulating plate 4 and, when a wire rod is used as the heating wire, the wire diameter are changed to generate heat per heating unit. The amount was different. In this embodiment, three types of heat generation units, heat generation unit 3-1 and heat generation unit 3-2 and heat generation unit 3-3, are created in descending order of heat generation amount, and the heat generation unit 3-1 having the largest heat generation amount is the central portion. The heat generation unit 3-2 and the heat generation unit 3-3 were arranged so that the heat generation amount gradually decreased toward the outside. By arranging the heat generating unit having a large calorific value toward the central portion in this way, the central portion becomes hotter, the flowing air is efficiently heated, and the calorific value on the outside is suppressed to suppress the calorific value of the storage container. The heat is dissipated to 11 so that the amount of heat that is lost in air heating is reduced. By the way, when changing the heat generation amount per sheet, the number of rows of the heat generation wires 5 attached to the insulating plate 4 may be increased as described later.

Further, FIG. 7 shows a configuration using the six grooves 6a. In this configuration, more heat generating units can be incorporated in the heat generating body than in the configuration shown in FIG. Also in this embodiment, the heat generation unit 3-1 having the largest heat generation amount is arranged in the central portion, and the heat generation unit 3-2 and the heat generation unit 3-3 are arranged so that the heat generation amount gradually decreases toward the outside. ..

In both the configuration shown in FIG. 6 and the configuration shown in FIG. 7, the heating capacity can be adjusted to decrease by replacing any heat generating unit with the blank material 71.

In the above embodiment, as the heat generating unit 3, as shown in FIG. 2, a unit in which two rows of heat generating wires 5 are attached to the insulating plate 4 is used. However, the heating wire 5 is not limited to two rows, and for example, as shown in FIG. 8, four rows of heating wires 5 may be provided. In this embodiment, as shown in the figure, four rows of heating wires 5 are connected in series. By increasing the number of rows of the heating wire 5 in this way, the length dimension of the heating unit 3 can be shortened. However, in order to position the electric wire 31 on the upstream side of the air flow so that the electric wire 31 is not affected by the warm air, an even-numbered row of heating wires 5 is attached to the insulating plate 4, and both electric wires 31 are attached. It is desirable that both are located on the 3A side at one end.

The present invention is not limited to the above-described embodiment, and various modifications may be made without departing from the gist of the present invention.

1 Gas heating device 2 Heat generator 3 Heat generation unit 4 Insulation plate 5 Heat generation wire 6 Holder 6a Groove 11 Storage container 31 Electric wire 32 Short circuit plate 33 Bolt 33a Long hole 34 Nut 41 Slit 61 Shaft 71 Blank material 72 Blank material

In order to solve the above problems, the gas heating device according to the present invention is provided in the middle of the gas passage, and is housed in a storage container portion that isolates the gas flowing inside and the outside, and is stored in the storage container portion and energized. In a gas heating device provided with a heating element that heats the gas flowing in the storage container portion by generating heat, the heating elements are arranged in an even number of rows independently of each other so as to be parallel to the plate-shaped insulating plate. It is held by inserting it into a slit formed in the insulating plate, and further, at least three heat generating units are attached to which the ends are connected to each other by a conductor of a member different from these heating elements. It is characterized in that it is composed of a composite in which a plurality of heat generating units are three-dimensionally assembled by using a holder for holding the heat generating unit.

Further, the heating capacity can be further finely adjusted by configuring the complex constituting the heating element to include a blank material to which the heating wire is not attached.

In this case, if the blank material is arranged on the outer periphery of the complex and a heat insulating layer is formed between the wall surface of the storage container and the complex, the heat energy generated by each heat generating unit is not the storage container. Can be transmitted to gas.

Claims (5)

A storage container that is provided in the middle of the gas passage and separates the gas flowing inside from the outside, and a heating element that is stored in this storage container and generates heat when energized to heat the gas flowing in the storage container. In a gas heating device provided with, the heating element is held by holding a heating unit in which an even row of heating wires is attached so as to be parallel to a plate-shaped insulating plate and at least three of the heating units. A gas heating device characterized in that it is composed of a composite in which a plurality of heat generating units are three-dimensionally assembled using a tool. The gas heating device according to claim 1, wherein the heating wires in an even row of the heating unit are connected to each other in two rows, all the heating wires are connected in series, and power is supplied from one end side. A plurality of types of heat generation units having different heat generation amounts due to differences in at least one of the number of rows and cross-sectional areas of the heat generation lines of the heat generation unit are provided, and the heat generation amount is the largest in the central portion of the three-dimensionally assembled complex. The gas heating device according to claim 2, wherein the heat generating unit is arranged, and the heat generating unit is arranged so that the amount of heat generated gradually decreases toward the outside. The gas heating device according to any one of claims 1 to 3, wherein the complex constituting the heating element includes a blank material to which a heating wire is not attached. The gas heating device according to claim 4, wherein the blank material is disposed on the outer periphery of the complex and forms a heat insulating layer between the wall surface of the storage container and the complex.

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