JPH03228982A - Heating device - Google Patents

Abstract

PURPOSE:To melt the snow effectively and to prevent an accident by detecting the temperatures of heating bodies to decide whether they are necessary to heat or not, and heating only when the heating body is at the temperature less than a specific value, when a current is fed to heat in order plural heating bodies furnishing a temperature sensor respectively, in a specific order. CONSTITUTION:Plural heaters 3A to 3D made by covering nickel chromium wire with a steel pipe through a regenerator substance are provided, and arranged on the roof of a house and the like. Then, temperature sensors 8A to 8D are provided at the outer side of the heaters, and the heating bodies and the temperature sensors are connected to a control circuit 4. And, in a snowfall, a current is fed to the heating bodies 3A to 3D in order, to heat them once to a specific temperature or higher. And thereafter, the temperatures of the heating bodies 3A to 3D are detected in order, and when some of them is at the specific temperature or higher, that heating body is omitted, and the following heaters are heated by feeding the current. Consequently, the snow melting on a roof and a road, a floor heating, and the like can be carried out effectively, and a wire disconnection of the device, an overheating fire, and the like can be prevented.

Description

Detailed Description of the Invention (Field of Industrial Application) The present invention is particularly applicable to heating devices for snow melting applied to roofs, parking lots, roads, etc., and heating devices applied to floor heating of houses. This relates to energization control in devices that use

(Prior Art) Many snow melting devices have been developed and put into practical use in order to reduce or eliminate the work of removing snow accumulated on the roofs of houses and removing snow from parking lots and roads. In the seed device of Otsu, Utility Model Publication No. 187675/1986, No. 64-31
As disclosed in Publications No. 107 and No. 64-31849, there are devices that cover the heating wire with a heat storage body, and a large amount of electric power is used at once when melting snow from large areas such as roofs and roads. By sequentially energizing the parts divided into several parts without having to make a large-capacity contract with an electric power company or modifying (installing) equipment to improve safety, it is possible to use electricity effectively. It is something that can be done. In this prior art, a certain part is energized in a predetermined order until the surface temperature of the device reaches a predetermined temperature or for a predetermined time, and then the next part is energized.

Floor heating systems generally include a panel body with hot water pipes installed on the floor, or heating wires arranged on the floor.

(Problems to be Solved by the Invention) Since the above-mentioned heating section includes a heat storage body, it is not possible to estimate the amount of heat retained in each heating section based only on the surface temperature of each heating section. For example, the surface temperature of the above-mentioned heating section continues to rise even after the current supply is cut off. For this reason, when a temperature sensor is used to sequentially switch over and energize a portion of the divided heating section as in the conventional control means described above, even if the heating section is sufficiently energized and heated, the surface temperature will exceed a predetermined temperature. During this period, no electricity is applied to other heating parts. For this reason, the temperature of the other heating parts may drop so much that snow cannot be melted effectively. In addition, if the power is turned on sequentially for a predetermined period of time, the power may be turned on even when the temperature is extremely high, causing a fire or malfunction, or when the temperature is insufficient to melt snow on an extremely cold day. There is an inconvenience that the energization may be switched even at high altitudes.

In addition, electric floor heating requires a large amount of electric power, but if the split heating section described above is used, it is possible to perform effective heating with a small amount of electric power without requiring the general large amount of electric power. However, the same problems as mentioned above arise regarding the control of the divided heating sections.

(Means for Solving the Problems) The present invention has been made in view of the above-mentioned problems, and includes a heat generating line, a heat storage body disposed around the heat generating line, a tube member that covers the heat storage body, and a tube member that covers the heat storage body. A plurality of heating parts each having a temperature sensor located nearby are provided, and the heating wires of the W and ridge heating parts are energized according to the output of the temperature sensor, and at least one heating part is connected to at least one other heating part. The heating wires of the plurality of heating parts are set to be energized one after another in a predetermined order so that two heating parts are not energized at the same time,
In addition, when the temperature sensor corresponding to the heating wire in the order to be energized detects that the temperature is above a predetermined temperature, the output of the temperature sensor of the next heating section is checked without energizing, and when the temperature is not above the predetermined temperature. It is characterized by comprising a control circuit that energizes the heating wire of the next heating section for a predetermined period of time.

(Function) When energizing multiple heating parts in sequence, a selection is made depending on the output of the temperature sensor as to whether to proceed to energization of the next heating part without energizing or to energize that heating part.

(Example) Examples of the present invention will be described next.

In this example, a nichrome wire is used for the heating wire as the heating member, ceramic powder is used as the heat storage body arranged around it, and a steel tube is used as the tube member, but the same and equal effect can be obtained. Of course, other materials may be used if possible.

1 to 3 show an embodiment of a heating device for melting snow.

As shown in the schematic diagram of FIG. 1, the device of this embodiment has four heating sections 3A, 3B, 3C, and 3D arranged side by side on the roof 2 of a house 1, and both ends of them and the output of a temperature sensor are connected to a control circuit 4. This is what I did. As shown in FIG. 2, each heating section 3A to 3D has a heat storage body 6 arranged around a nichrome wire 5, a steel tube 7 covering the periphery, and a temperature sensor 8 attached to the outer surface of the steel tube. A predetermined number of heating members are connected in series. And nichrome wire 5 of each heating section
Conductive wires 9A, 9B, and 9C are attached to one end of each.

9D is connected to the other end of the common conductor 10, which connects the control circuit 4.
Electricity can be supplied from each temperature sensor 8A to 8D to the control circuit 4 with an output of 911A.

11B, IIC, and IID are connected. The control circuit 4 controls energization to each of the heating units 3A to 3D according to a flowchart as shown in FIG. That is, when the energization switch is turned on, the first energization heating is performed once in the heating parts 38 to 3D.
is heated to a predetermined temperature (60° C.) or higher, and the next electrical heating is performed at a fixed time. To explain in more detail,
First, check the output of the temperature sensor 8A (check whether the output of this sensor 8A is a temperature sufficient for snow melting, in this example, 60°C or higher), and if it is not higher than 60°C, the nichrome wire 1 of the heating section 3A is energized for a predetermined period of time, and the output of the temperature sensor 8A is checked again. Note that the predetermined energization time (the time interval for checking the output of the temperature sensor 8A) is set to, for example, 10 seconds. When the temperature eventually reaches 60°C or higher, the output of the temperature sensor 8B is checked and when the temperature reaches a predetermined temperature (60°C) or higher, the next heating section 3B is turned on.
, and then proceed sequentially to the heating section 3D. In this way, the heating units 3A to 3D are once heated to a predetermined temperature or higher.

Next, the temperature sensor 8A is checked, and if the temperature is below a predetermined temperature (60°C), it is energized and heated for a predetermined period of time (3 minutes).
If the temperature is higher than 0.degree. C., the nichrome wire 1 of the heating section 3B is not energized, and the output of the temperature sensor 8C of the next heating section 3C is checked, and heating is carried out in sequence.

During this predetermined period of energization, if it is sensed that the heating part 3A is at a predetermined temperature (60° C.) or higher during the energization, the energization to the heating part 3A is cut off, and the next heating part 3B is energized. .

According to the embodiments described above, it is possible to melt snow without causing an accident due to overheating of the snow melting heating device, or without inconveniences such as insufficient snow melting on the roof due to the heating unit being damaged.

FIG. 4 shows another embodiment of the present invention, in which six device parts are divided into three sets, which is particularly effective for melting snow on large roofs and parking lots. In this example, heating portions 31A, 3
1B, 31C, 31D, 3]E, 31F, 31A and 31D, 31B and 31E, 31C
It is divided into three sets of heating parts, 31F and 31F, and two heating parts are energized at the same time, so that the interval between energization of one heating part and the next energization is not too long. Also, the temperature sensors are 81A and 81B so that there is one in each group.
, 81C.

In the embodiment shown in FIG. 4, the same effects as those in the embodiment shown in FIGS. 1 to 3 can be obtained by performing the same energization control as in the above-described embodiment.

FIG. 5 is a flowchart showing still another embodiment of the present invention, which is an improvement on the one shown in FIG.

In other words, in the configuration shown in Figure 1, if a disconnection occurs in any part of the circuit, the nichrome wire will not generate heat;
Therefore, in the flowchart of FIG. 3, the snow melting device does not work at all after the wire breaks. Also temperature sensor 8A~
If any of the 8Ds fails or the sensor output wire is disconnected, the sensor output will not correspond to a temperature above the specified temperature even if the nichrome wire is energized for a long time, and the device will overheat if the nichrome wire is continued to be energized. This may cause a fire or malfunction. Therefore, in this embodiment, when the continuous energization time to the nichrome wire reaches, for example, 10 minutes or more, which is considered to be an energization time that would be unthinkable in normal operation, an alarm is issued, and the overheated part where the -degree alarm has occurred is Electricity is not turned on until the alarm is canceled.

According to the second embodiment, in addition to the same effects as the above two embodiments, there is also the effect of preventing inoperation and overheating due to wire breakage or sensor failure.

In addition to the above-mentioned heating device for melting snow, the present invention also shows excellent effects when applied as a heating device for floor heating.

(Effects of the invention) According to the present invention, as a heating device for snow melting or floor heating, it is possible to effectively melt snow without inconveniences such as heating of the heating part or insufficient snow melting effect or heating effect due to heating delay. and heating.

[Brief explanation of drawings]

Figures 1 to 3 show one embodiment of the present invention.
2 is a cutaway perspective view of a part of the snow melting device, FIG. 3 is a flowchart, FIG. 4 is a schematic diagram showing another embodiment of the present invention, and FIG. It is a flowchart which shows yet another example. 1 is a house 2 is a roof 3A, 3B, 3D, 31A, 31B, 31G, 31D. 31E and 31F are heating parts 4. 41 is a control circuit 5 is a heating wire 6 is a heat storage body 7 is a tube member 8. 8A, 8B, 8C, 81A, 81B, and 81C are temperature sensors.

Claims (1)

[Claims] (1) A plurality of heating parts each having a heat generating line, a heat storage body disposed around the heat generating line, a pipe member covering the circumference of the heat storage body, and a temperature sensor located near the pipe member are provided, and the temperature sensor The heating wires of the plurality of heating parts are energized according to the output of the plurality of heating parts, and the heating wires of the plurality of heating parts are energized in a predetermined order so that at least one heating part is not energized at the same time as at least one other heating part. The heating wires are set to be energized in sequence, and when the temperature sensor corresponding to the heating wire in the order to be energized senses that the temperature is higher than a predetermined temperature, the temperature sensor of the next heating section is not energized. 1. A heating device comprising: a control circuit that checks the output of the heating section and, when the temperature is not higher than a predetermined temperature, energizes the heating wire of the next heating section for a predetermined period of time.