JPH07240136A - Temperature switch - Google Patents

Abstract

PURPOSE:To change the ON/OFF time of a heating element according to a load, and extend the applicable range of a temperature switch by providing a plurality of heating elements differed in heating capacity, and selectively switching a change-over switch provided on each heating element according to the load of a heating equipment. CONSTITUTION:A thermosensitive switch part 16 such as a thermal reed switch or bimetallic thermostat having a contact 14 is arranged in the inner part B of a case 12. Heating elements 18, 20 such as resistors differed in heat capacity are arranged in positions close to the switch part 16. The terminals 18b, 20b of the elements 18, 20 are connected to the output side terminal 16b of the switch part 16 in the inner part B of the case 12, and the terminals 18a, 20a are pulled out to the outer part A, and connected to switch contacts 32, 34, respectively. According to such a constitution, the ON/OFF time of a heating element can be changed according to a load to extend the applicable range.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a temperature switch which detects ambient temperature changes and repeats on / off, and more particularly to a temperature switch used in a water pipe antifreezing device or various electric heating devices. The present invention relates to a temperature switch in which a plurality of heat generating elements having different heat generating capacities are provided, and a changeover switch provided in each of these heat generating elements is selectively changed according to a load to expand the application range of the temperature switch.

[0002]

2. Description of the Related Art A conventional temperature switch is equipped with a heat sensitive switch which detects a change in temperature such as an air temperature by a heat sensitive element to turn it on and off. It was a position control temperature switch. Therefore, when the temperature is lower than the ON temperature of the heat sensitive switch, the temperature switch naturally remains in the ON state, and the ON / OFF is not repeated, and only when the temperature becomes the OFF temperature obtained by adding the temperature differential to the ON temperature, the OFF state occurs. It was supposed to be.

As such a heat-sensitive element, there is, for example, a bimetal, and a heat-sensitive switch using this bimetal is turned on / off according to a temperature change to control a controlled member such as various electric heating devices. A bimetal thermostat is generally known as a switch.

Such a bimetal thermostat is switched on by turning on when the temperature falls below a preset switch-on temperature, and a temperature differential peculiar to the bimetal thermostat is turned on. When the temperature rises to the added switch-off temperature, the switch is turned off and the switch is turned off.

FIG. 7 and FIG. 8 show a water pipe anti-icing device provided with such a bimetal thermostat.

This water pipe freeze prevention device is made of bimetal
A heater element 102 is connected in series to the thermostat 100, and power is supplied via a plug 104. When the water pipe antifreezing device is attached to the water pipe 106, the heater element 102
Is wound so that it directly contacts the water pipe 106, and the bimetal thermostat 100 is attached to the water pipe 1.
It is arranged so as to be in direct contact with 06, and is configured to be turned on / off according to the temperature change of the water pipe 106.

The bimetal thermostat 100 used in such a water pipe anti-icing device has a water pipe 106.
In order to prevent the freezing of the heater element 102, for example, the switch-on temperature for energizing the heater element 102 is set to 5 ° C., and the switch-off temperature is set to 5 ° C. to the switch-on temperature, for example, 6 ° C. as a temperature differential. 11 ° C
Is set to.

Then, when the temperature drops and the temperature of the water pipe 106 reaches 5 ° C., the bimetal thermostat 10
0 is switched on and the heater element 102
Is energized. When the heater element 102 is energized, the temperature of the water pipe 106 rises to a switch-off temperature of 11 ° C, which is a switch-on temperature of 5 ° C plus a temperature differential of 6 ° C, and the bimetal thermostat 100. Is switched off to stop the power supply to the heater element 102.

That is, in the water pipe antifreezing device provided with the temperature switch composed of the above-mentioned conventional bimetal thermostat, the temperature of the water pipe is switched on due to the presence of the temperature differential of the bimetal thermostat. When the temperature of the water pipe is switched on at 5 ° C, the power supply to the heater element is continued without being switched off until the temperature of the water pipe rises to the switch-off temperature of 11 ° C.

However, in winter in cold regions where a water pipe anti-freezing device is required, the temperature of the water pipe often does not rise above 11 ° C, and the temperature of the water pipe is below 11 ° C. It is empirically known that even if there is, the water pipe does not freeze.

Therefore, in the conventional water pipe anti-freezing device, once the temperature of the water pipe reaches 5 ° C., the bimetal thermostat is switched on, and the heater element is energized, the water pipe Even if the temperature rises to a temperature that does not cause freezing and the temperature continues,
Unless the off temperature reaches 11 ° C, the bimetal thermostat remains switched on, and the power supply to the heater element is not stopped, resulting in wasting unnecessary power. It was

In recent years, in order to solve these problems, the temperature switch has been improved. For example, as shown in FIG. 9, a sealed case 110 and a case 110 arranged inside the case 110 are turned on by a temperature change. The heat-sensitive switch section 112 is turned on / off, and the heat-generating element 114 is provided in the case 110 in the vicinity of the heat-sensitive switch section 112. The heat-generating element 114 in the case 110 turns on the heat-sensitive switch section 112. A structure has been proposed in which current is energized to generate heat, and when the heat-sensitive switch 112 is turned off, energization is interrupted to prevent heat generation.

In this improved temperature switch, the lead terminal 112b of the heat sensitive switch 112 and the heating element 114 are used.
The female socket 116 is connected to the lead terminal 114b of the outside of the case 110, and the lead terminal 112a of the heat-sensitive switch 112 and the heating element 114 are connected.
The male power plug 118 is connected to the lead terminal 114a of the
Power is supplied by connecting 18 to a power source. A heater plug 122 connectable to the female socket 116 is connected to both lead terminals 120 a and 120 b of the heater element 120.

In the above-described structure, in this temperature switch, the temperature inside the case 110 is in thermal equilibrium with the temperature outside the case, and when the temperature of the heat sensitive switch unit 112 drops to the switch-on temperature, the heat sensitive switch unit 112 switches the switch.・ Turned on. When the heat-sensitive switch unit 112 is turned on, the heat-generating element 114 is energized to generate heat.
14 becomes feverish. When the temperature of the heat-sensitive switch unit 112 inside the case 110 rises to the switch-off temperature due to the temperature rise due to the heat generation of the heating element 114, the heat-sensitive switch unit 112 is switched off regardless of the temperature outside the case, and The heating element 114 is also not energized, and the temperature inside the case 110 also begins to gradually drop.

When the temperature inside the case 110 is in thermal equilibrium with the temperature outside the case and the temperature of the heat sensitive switch section 112 drops to the switch-on temperature, the heat sensitive switch section 1
12 is switched on again. The on / off time and cycle of the temperature switch vary depending on the time when the temperature outside the case 110 and the temperature inside the case 110 are in thermal equilibrium.

[0016]

However, the above-mentioned temperature switch is composed of a heat sensitive switch portion which is turned on / off by a temperature change, and a heat generating element which is arranged in the case in the vicinity of the heat sensitive switch portion. The on / off time and cycle of the temperature switch vary depending on the time of thermal equilibrium between the temperature outside the case and the temperature inside the case. However, since the heating capacity of the heating element is constant, the on / off time of the temperature switch However, there is a problem that the temperature switch cannot be adjusted according to the load and the application range of the temperature switch is narrow.

The present invention has been made in view of the above problems of the prior art. The object of the present invention is to provide a plurality of heating elements having different heating capacities in a temperature switch, By selectively changing the changeover switch provided in each heating element according to the load of the electric heating device, the on / off time of the heating element can be changed according to the load, and the temperature switch can be used to expand the application range of the temperature switch. It is the one we are trying to provide.

[0018]

In order to achieve the above object, the temperature switch according to the present invention is a sealed case, and a heat sensitive switch portion which is disposed in the case and is turned on / off by a temperature change. A heat capacity that is disposed in the case in the vicinity of the heat-sensitive switch portion and that is energized to generate heat when the heat-sensitive switch portion is turned on and that does not generate heat when the heat-sensitive switch portion is turned off. A plurality of different heating elements and a switch contact disposed on the outside of the case and provided on one terminal of each heating element, and a switch contact of each heating element are matched to the load of the controlled member. And a changeover switch arranged so as to be able to be selected, and only the heating element of the switch contact selected by the changeover switch can be energized.

[0019]

According to the present invention, based on the above construction, a heat sensitive switch part which is turned on / off by a temperature change is provided in a sealed case, and the heat sensitive switch part is turned on in the vicinity of the heat sensitive switch part. A plurality of heating elements with different heat capacities are provided, each of which has a different heat capacity and is located outside the case. Since the switch contact of the heating element is configured to be selected by the changeover switch according to the load of the controlled member, the temperature inside the case is in thermal equilibrium with the temperature outside the case, and the temperature of the heat sensitive switch part When the temperature drops to the switch-on temperature, the thermal switch unit is switched on. When the heat-sensitive switch unit is turned on, the heat generating element selected by the changeover switch is energized to generate heat. Further, when the temperature of the heat-sensitive element in the case rises to the switch-off temperature due to the temperature rise due to the heat generation of the heat-generating element, the heat-sensitive switch section is switched off.

When the thermal switch is switched off,
When the heating element is no longer energized, the temperature inside the case begins to gradually drop, the temperature inside the case is in thermal equilibrium with the temperature outside the case, and the temperature of the heat-sensitive switch decreases to the switch-on temperature of the heat-sensitive switch. Then, the heat-sensitive switch section is switched on again, and even if the temperature outside the case is equal to or lower than the on-temperature of the heat-sensitive switch section, the on / off can be repeated.

Therefore, in the temperature switch according to the present invention, the heat sensitive switch portion having the contacts is disposed inside the sealed case, and the controlled member and the like are provided in the vicinity of the heat sensitive switch portion. A plurality of heating elements with different heat capacities that can select the switch contact according to the load are provided.If any of the heating elements is selected, the heating element selected when the thermal switch is turned on When the heat switch is turned off when electricity is turned on, the current is cut off and the temperature switch is turned on / off.
The off time and period can be changed.

[0022]

Embodiments of the temperature switch according to the present invention will now be described in detail with reference to the drawings.

FIG. 1 shows a first temperature switch according to the present invention.
2 is an explanatory diagram showing an example of the case where the temperature switch according to FIG. 1 is used in a water pipe freeze prevention device, and the temperature switch 10 includes an external A and an internal B. And a box-shaped case 12 in which the inside B is sealed. The case 12 is formed so that the temperature of the inside B is in thermal equilibrium with the temperature of the outside A.

In the inside B of the case 12, a known contact 14
A heat-sensitive switch section 16 such as a thermal reed switch or a bimetal thermostat is provided, and at a position near the heat-sensitive switch section 16, two heat resistance wires or heating wires having different heat capacities are provided. The heating elements 18 and 20 are provided.

Further, one terminal 24a of the power plug 22
The lead wire 26a, which is extended further, has a heat-sensitive switch 1
6 is connected to the input side terminal 16a, and the thermal switch unit 1
The output-side terminal 16b of 6 is pulled out from the inside B of the case 12 and is connected to one terminal 30a of the female socket 28. And the other terminal 24 of the power plug 22
The lead wire 26b extended from b is connected to the other terminal 30b of the female socket 28.

The output side terminal 1 of the heat sensitive switch section 16
6b includes terminals 18b, 2 of one of the heating elements 18, 20
0b is connected inside the case 12, and the heating element 1
The other terminals 18a and 20a of the switches 8 and 20 are drawn out from the inside B of the case 12 to the outside A, and the switch contacts 3
2, 34 are provided. And the heating elements 18, 20
The changeover switch 36 connected to the other terminal 24b of the power plug 22 can be selectively turned on to the switch contacts 32 and 34 of.

Temperature switch 1 having the above circuit configuration
An example of the case where 0 is used in the water pipe antifreezing device 40 as the controlled member is shown in FIG.

The water pipe freeze prevention device 40 includes a connection plug 42 connected to the socket 28 on the temperature switch 10 side,
The heater element 46 is connected to the terminals 44a and 44b of the connection plug 42, and the heater element 46 is integrally embedded in a strip member 48 wound around a water pipe or the like.

The socket 2 on the temperature switch 10 side
Insert the connection plug 42 of the water pipe anti-icing device 40 side into 8, and connect the power plug 22 to a power outlet (not shown).
The electric power is supplied to the heater element 46 by inserting the electric power into the heater element 46. At this time, the heater element 46 is connected to the heating element 18 or 20 with respect to the power source.
Since it is connected in parallel with the heater element 46
Since the heater element 46 can be controlled without being subjected to the power supply voltage by the heating element 18 or 20 and a voltage drop due to the heating element 18 or 20, the heating element 18 or 20 is set independently of the controlled member such as the heater element 46. It is highly versatile.

The operation of the temperature switch 10 having the above configuration will be described. First, when the temperature switch 10 is used in the water pipe antifreezing device 40, the strip member 48 in which the heater element 46 is integrally embedded is directly wound around the water pipe, and the connection plug 42 is connected to the socket on the temperature switch 10 side. It is plugged in 28 and the electric power is supplied. Further, the changeover switch 36 of the temperature switch 10 causes the heating element 1 to
One of the switch contacts 32 and 34 of 8 and 20 is selected and connected.

When the temperature of the water pipe decreases and the contact 14 of the heat sensitive switch section 16 is closed in the case 12, the one heating element 18 or 20 selected by the changeover switch 36 and the heater element 46 are energized to generate heat. However, the temperature of the water pipe rises due to the heat generated by the heater element 46 to prevent freezing, and the temperature inside the sealed case 12 rises due to the heat generated by the heating element 18 or 20. Heat-sensitive switch section 16 when temperature rises
Contact 14 is opened and switched off.

With this switch off, the heating element 18 or 20 and the heater element 46 are de-energized,
The fever is stopped. The heating element 18 or 20 is provided for the heat sensitive switch unit 1 when the temperature of the water pipe reaches a predetermined temperature.
The amount of heat may be designed in advance so that the contact 14 of 6 is switched off.

The heat generating elements 18 and 20 have different heat capacities, and the changeover switch 36 selects the switch contacts 32 and 34 of the heat generating element 18 or 20 according to the load such as the controlled member. The on / off time and cycle of the temperature switch 10 can be changed.

The temperature switch 10 controls the supply of electric power to the heater element 46 by opening / closing the contact 14 of the heat sensitive switch portion 16 to switch on / off in the above-described cycle, thereby improving efficiency. Well prevent freezing of water pipes. That is, even if the temperature of the water pipe does not rise to the predetermined temperature that is the switch-off temperature of the heat-sensitive switch unit 16 but rises slightly above the switch-on temperature, it can be switched off. .

Further, due to the principle of thermal equilibrium, the case 12
The lower the temperature of the outside A of the device becomes, the longer the switch-on time becomes, and if the case 12 is blown by the wind, heat is taken from the case 12 by the wind.
8 or 20 makes it difficult for the temperature of the inside B to rise, so that the switch-on time becomes long and the case 1
When 2 is exposed to sunlight, the temperature rise of the inside B of the case 12 is promoted and the switch-on time is shortened.

The temperature switch 1 is used regardless of the temperature.
0 is a switch due to the temperature change of the inside B of case 12.
It is turned on / off, and the temperature switch 1 is maintained while maintaining the water pipe temperature at a temperature that does not freeze the water pipe.
Since the switch on / off control of 0 can be performed, it is possible to prevent unnecessary and unnecessary power from being supplied to the heater element 46. Also, the thermal switch unit 1
The bimetal thermostat or the like as 6 may be a so-called variable type that can change the switch-on temperature and the switch-off temperature.

FIG. 3 shows a second temperature switch according to the present invention.
2 is a circuit configuration diagram showing an embodiment of the present invention, and the same components as those in the first embodiment described above are designated by the same reference numerals, and detailed description thereof will be omitted.

As in the first embodiment, the heat sensitive switch portion 16 is provided in the inside B of the case 12, and a resistor or a heating wire having a different heat capacity is provided at a position close to the heat sensitive switch portion 16. 2 heating elements 1 consisting of
8 and 20 are provided.

Also, one terminal 24a of the power plug 22
A half-wave rectifying diode 50 is connected to the extended lead wire 26 a in parallel with the heat-sensitive switch portion 16 arranged inside the case B.

Further, one terminal 30a of the socket 28 to which the lead wire drawn out from the case 12 of the temperature switch 10 is connected, and the other lead wire 26 of the power plug 22.
The LED protection resistor 52 and the LED protection diode 5 are provided between the other terminal 30b of the socket 28 to which b is connected.
4 and the LED 56 are connected in series with the thermal switch unit 16.

The half-wave rectifying diode 50 is provided when the thermal switch 16 of the temperature switch 10 is in the off state.
It is possible to supply 50% of electric power to the load by the half-wave rectifying diode 50 without completely interrupting the energization, and it is possible to maintain the controlled device, such as an electric heating device, in a heat retaining state.

The LED 56 is a lamp for confirming the ON state of the heat-sensitive switch section 16 of the temperature switch 10. To protect the LED 56, the LED protection resistor 52 and the LED protection diode 54 are used. ing.

With the above structure, in the temperature switch 10 having the circuit configuration diagram according to the second embodiment, the heat sensitive switch portion 16 having the known contact point 14 is provided in the inside B of the sealed case 12. In addition, two heat generating elements 1 having different heat capacities are provided at positions close to the heat sensitive switch section 16 so that the switch contacts 32 and 34 can be selected by the changeover switch 36 according to the load of the controlled member or the like.
Since 8 and 20 are provided, when one of the heating elements 18 and 20 is selected by the changeover switch 36, the selected heating element 18 or 20 is energized when the heat-sensitive switch section 16 is turned on. When heat is generated and the heat-sensitive switch unit 16 is turned off, energization is cut off, and the on / off time and cycle of the temperature switch 10 can be changed.

Further, even when the heat-sensitive switch portion 16 of the temperature switch 10 is in the off state, the half-wave rectifying diode 50 does not completely cut off the power supply to the load 50.
% Of electricity can be supplied. Therefore, electric kotatsu, electric blanket,
When an electric carpet, an electric pot, or the like is connected, even if the heat-sensitive switch unit 16 is switched off, the power of 50% is supplied to these without being cut off by the half-wave rectifying diode 50. It is possible to save about 30% or more power without reducing the heating capacity or the hot water supply capacity.

FIG. 4 shows a third embodiment of the temperature switch according to the present invention.
2 is a circuit configuration diagram showing an embodiment of the present invention, and the same components as those in the first embodiment described above are designated by the same reference numerals, and detailed description thereof will be omitted.

A lead wire 26a extending from one terminal 24a of the power plug 22 is connected to a terminal 16a on the input side of the heat-sensitive switch section 16 arranged in the inside B of the case 12. Then, the output side terminal 16b of the heat sensitive switch portion 16 is pulled out from the inside B of the case 12,
It is connected to a lead wire 26b extending from the other terminal 24b of the power plug 22 via a power relay coil 60 connected in series with the heat sensitive switch section 16, and this lead wire 26b is the other terminal of the socket 28. Three
It is connected to 0b.

One end of a power relay contact 62 is connected to the lead wire 26a extending from the power plug 22 in parallel with the thermal switch unit 16, and the other end of the power relay contact 62 is connected to one of the sockets 28. Is connected to the terminal 30a.

In the above structure, in the temperature switch 10, a known contact 14 is provided in the inside B of the sealed case 12.
The heat-sensitive switch section 16 provided with is disposed, and the switch contacts 32 and 34 can be selected by the change-over switch 36 at a position close to the heat-sensitive switch section 16 according to the load of the controlled member or the like. Since the two heat generating elements 18 and 20 having different heat capacities are arranged, when one of the heat generating elements 18 and 20 is selected by the changeover switch 36, the heat generation selected when the heat sensitive switch section 16 is turned on. When the element 18 or 20 is energized to generate heat and the heat-sensitive switch section 16 is turned off, the energization is cut off to change the on / off time and cycle of the temperature switch 10.

The power relay coil 60 is a relay for amplification, and when the load capacity of the controlled member connected to the socket 28 is large, the heating element 18 or 2 is used.
By turning on the power relay contact 62 together with the selection of 0, optimum temperature control can be performed without receiving a voltage drop due to the heating element.

FIG. 5 shows a fourth temperature switch according to the present invention.
Is a circuit configuration diagram showing an embodiment of the present invention, and the same components as those in the second and third embodiments described above are denoted by the same reference numerals, and detailed description thereof will be omitted.

One end of a power relay coil 60 is connected in series to the output-side terminal 16b of the heat-sensitive switch section 16 which constitutes the temperature switch 10, and the other end of the power relay coil 60 is the other terminal 30b of the socket 28. It is connected to the.

Further, one end of the power relay contact 62 is connected to the lead wire 26a extending from the power plug 22, and the other end of the power relay contact 62 is connected to the socket 2.
8 is connected to one terminal 30a.

Further, the lead wire 26a extending from the power plug 22 is connected with the half-wave rectifying diode 50 in parallel with the power relay contact 62, and the power relay contact 62 and the half-wave rectifying diode 50 are connected. One terminal 3 of the socket 28 to which the lead wire on the output side is connected
0a and the other terminal 30b of the socket 28 to which the other lead wire 26b of the power plug 22 is connected, LE
D protection resistor 52, LED protection diode 54 and LE
D56 and D56 are connected in series to the thermal switch unit 16.

In the above structure, in the temperature switch 10, a known contact 14 is provided in the inside B of the sealed case 12.
The heat-sensitive switch section 16 provided with is disposed, and the switch contacts 32 and 34 can be selected by the change-over switch 36 at a position close to the heat-sensitive switch section 16 according to the load of the controlled member or the like. Since the two heat generating elements 18 and 20 having different heat capacities are arranged, when one of the heat generating elements 18 and 20 is selected by the changeover switch 36, the heat generation selected when the heat sensitive switch section 16 is turned on. It is possible to change the ON / OFF time and cycle of the temperature switch 10 by turning off the power when the heat sensitive switch section 16 is turned off by heating the element 18 or 20 by heating.

Further, the power relay coil 60 is a relay for amplification, and when the controlled member connected to the socket 28 has a large load capacity, the heating element 18 or 2 is used.
By turning on the power relay contact 62 together with the selection of 0, optimum temperature control can be performed without receiving a voltage drop due to the heating element.

Further, even when the heat-sensitive switch portion 16 of the temperature switch 10 is in the off state, the half-wave rectifying diode 50 is applied to the load to prevent the current from being completely cut off.
This means that 0% power can be supplied, and when an electric kotatsu, an electric blanket, an electric carpet, an electric pot, or the like is connected as a load of an electric heating device that is a controlled member,
Even if the heat-sensitive switch unit 16 is switched off, 50% of the power is supplied to these without being cut off by the half-wave rectifying diode 50, so that the heating capacity and the hot-water supply capacity are not reduced and the power is reduced to about 30%. You can save more than% power.

FIG. 6 shows a fifth embodiment of the temperature switch according to the present invention.
2 is a circuit configuration diagram showing an embodiment of the present invention, and the same components as those in the first embodiment described above are designated by the same reference numerals, and detailed description thereof will be omitted.

In this embodiment, a thermal reed switch having a known contact 14 or a bimetal switch is provided inside the case 12 constituting the temperature switch 70.
A thermosensitive switch unit 16 such as a thermostat is provided, and a resistor or a heating wire having a different heat capacity is provided at a position close to the thermosensitive switch unit 3
Individual heating elements 18, 20 and 72 are provided.

The terminal 1 on the output side of the thermal switch unit 16
6b includes one terminal 18 of the heating elements 18, 20, 72.
b, 20b, 72b are connected inside the case 12, and the other terminals 18a, 2 of the heating elements 18, 20, 72 are connected.
0a and 72a are drawn from the inside B of the case 12 to the outside A, and switch contacts 32, 34 and 74 are provided respectively. The changeover switch 76 connected to the other terminal 24b of the power plug 22 can be selectively turned on to the switch contacts 32, 34, 74 of the heating elements 18, 20, 72.

The temperature switch 70 shown in the fifth embodiment can be used instead of the temperature switch 10 used in the second to fourth embodiments.

In the above structure, in the temperature switch 70, the known contact 14 is provided in the inside B of the sealed case 12.
The heat sensitive switch section 16 provided with is disposed, and at positions near the heat sensitive switch section 16, the switch contacts 32, 34, 74 are selected by the changeover switch 76 according to the load of the controlled member or the like. Since three heat generating elements 18, 20, 72 having different heat capacities are provided, the heat generating elements 18, 20,
When any one of 72 is selected, the thermal switch unit 16
When the switch is turned on, the selected heating element 18, 20 or 72 is energized to generate heat, and when the thermosensitive switch unit 16 is turned off, the energization is cut off to change the on / off time and cycle of the temperature switch 70. be able to.

[0062]

Since the present invention is constructed as described above, it has the following effects.

The sealed case, the heat-sensitive switch portion which is arranged in the case and is turned on / off by a temperature change, and the heat-sensitive switch portion which is arranged in the vicinity of the heat-sensitive switch portion in the case are turned on. A plurality of heating elements with different heat capacities that are energized to generate heat when the heat-sensitive switch is turned off and that does not generate heat when the heat-sensitive switch section is turned off are arranged outside the case, and are connected to one terminal of each heating element. It has a provided switch contact and a changeover switch arranged so that the switch contact of each heating element can be selected according to the load of the controlled member, and only the heating element of the switch contact selected by the changeover switch is energized Because it was possible,
When the temperature inside the case is in thermal equilibrium with the temperature outside the case and the temperature of the heat sensitive switch unit falls to the switch-on temperature, the heat sensitive switch unit is switched on. When the heat-sensitive switch unit is turned on, the heat generating element selected by the changeover switch is energized to generate heat. When the temperature of the heat-sensitive element in the case rises to the switch-off temperature due to the temperature rise due to the heat generation of the heat-generating element, the heat-sensitive switch section is switched off.

When the heat sensitive switch section is switched off,
When the heating element is no longer energized, the temperature inside the case begins to gradually process, the temperature inside the case is in thermal equilibrium with the temperature outside the case, and the temperature of the heat-sensitive switch decreases to the switch-on temperature of the heat-sensitive switch. Then, the heat-sensitive switch section is switched on again, and even if the temperature outside the case is equal to or lower than the on-temperature of the heat-sensitive switch section, the on / off can be repeated.

That is, since the temperature switch according to the present invention is provided with a plurality of heat generating elements having different heat capacities, the switch contacts can be selected by the changeover switch according to the load of the controlled member, etc. The on / off time of the temperature switch can be changed by selecting one of the heating elements.

[Brief description of drawings]

FIG. 1 is a circuit configuration diagram showing a first embodiment of a temperature switch according to the present invention.

FIG. 2 is a schematic configuration diagram showing an example in which the temperature switch according to FIG. 1 is used in a water pipe freeze prevention device.

FIG. 3 is a circuit configuration diagram showing a second embodiment of the temperature switch according to the present invention.

FIG. 4 is a circuit configuration diagram showing a third embodiment of the temperature switch according to the present invention.

FIG. 5 is a circuit configuration diagram showing a fourth embodiment of the temperature switch according to the present invention.

FIG. 6 is a circuit configuration diagram showing a fifth embodiment of the temperature switch according to the present invention.

FIG. 7 is a schematic configuration diagram showing a case where a temperature switch having a conventional structure is used in a water pipe freeze prevention device.

8 is a schematic explanatory view showing an actual mounting state of the water pipe freeze prevention device of FIG. 7. FIG.

FIG. 9 is a schematic configuration diagram showing a case where a temperature switch having a conventional structure is used in a water pipe freeze prevention device.

[Explanation of symbols]

 10 Temperature Switch 12 Case 14 Contact 16 Heat Sensitive Switch Section 18, 20, 70 Heating Element 22 Power Plug 28 Socket 32, 34 Switch Contact 36 Changeover Switch 42 Connection Plug 46 Heater Element 50 Half Wave Rectifier Diode 52 LED Protection Resistor 54 LED protection diode 56 LED 60 Power relay coil 62 Power relay contact

Claims (6)

[Claims] 1. A hermetically sealed case, a heat-sensitive switch section that is arranged in the case and is turned on / off by a temperature change, and a heat-sensitive switch section that is arranged in the case in the vicinity of the heat-sensitive switch section. A plurality of heat-generating elements having different heat capacities that are energized to generate heat when the heat-sensitive switch section is turned on and do not generate heat when the heat-sensitive switch section is turned off, and are disposed outside the case, A switch contact provided on one terminal of each heating element, and a changeover switch arranged so that the switch contact of each heating element can be selected according to the load of the controlled member, The temperature switch is characterized in that only the heating element of the switch contact selected by can be energized. 2. A hermetically sealed case, a heat-sensitive switch section that is disposed in the case and is turned on / off according to a temperature change, and a heat-sensitive switch section that is disposed in the case in the vicinity of the heat-sensitive switch section. A plurality of heat-generating elements having different heat capacities that are energized to generate heat when the heat-sensitive switch section is turned on and do not generate heat when the heat-sensitive switch section is turned off, and are disposed outside the case, A switch contact provided on one terminal of each heating element, and a changeover switch arranged so that the switch contact of each heating element can be selected according to the load of the controlled member, Only the heating element of the switch contact selected by can be energized, and a half-wave rectifying diode is provided outside the case in parallel with the heat-sensitive switch part inside the case. Temperature switch, characterized in that connection was. 3. A hermetically sealed case, a heat-sensitive switch section that is arranged in the case and is turned on / off by a temperature change, and a heat-sensitive switch section that is arranged in the case in the vicinity of the heat-sensitive switch section. A plurality of heat-generating elements having different heat capacities that are energized to generate heat when the heat-sensitive switch section is turned on and do not generate heat when the heat-sensitive switch section is turned off, and are disposed outside the case, A switch contact provided on one terminal of each heating element, and a changeover switch arranged so that the switch contact of each heating element can be selected according to the load of the controlled member, Only the heating element of the switch contact selected by can be energized, and further, the LED protection resistor and the LED protection diode are connected in series with the heat-sensitive switch section in the case. Temperature switch being characterized in that connecting the LED. 4. A hermetically sealed case, a heat sensitive switch section which is disposed in the case and is turned on / off by a temperature change, and a heat sensitive switch section disposed in a vicinity of the heat sensitive switch section in the case, A plurality of heat-generating elements having different heat capacities that are energized to generate heat when the heat-sensitive switch section is turned on and do not generate heat when the heat-sensitive switch section is turned off, and are disposed outside the case, A switch contact provided on one terminal of each heating element, and a changeover switch arranged so that the switch contact of each heating element can be selected according to the load of the controlled member, Only the heating element of the switch contact selected by can be energized, and a half-wave rectifying diode is provided outside the case in parallel with the heat-sensitive switch part inside the case. It continued, and the temperature switch, characterized in that the connection between the heat-sensitive switch unit and the LED protection resistor in series with the LED protection diode and LED in the case. 5. A hermetically sealed case, a heat-sensitive switch section that is arranged in the case and is turned on / off by a temperature change, and a heat-sensitive switch section that is arranged in the case in the vicinity of the heat-sensitive switch section. A plurality of heat-generating elements having different heat capacities that are energized to generate heat when the heat-sensitive switch section is turned on and do not generate heat when the heat-sensitive switch section is turned off, and are disposed outside the case, A switch contact provided on one terminal of each heating element, and a changeover switch arranged so that the switch contact of each heating element can be selected according to the load of the controlled member, Only the heating element of the switch contact selected by can be energized, and further, the power relay contact is connected to the outside of the case in parallel with the thermal switch part inside the case. Rutotomoni, temperature switches, characterized in that connecting the power relay coil in series with the thermal switch unit. 6. A hermetically sealed case, a heat-sensitive switch section that is arranged in the case and is turned on / off by a temperature change, and a heat-sensitive switch section that is arranged in the case in the vicinity of the heat-sensitive switch section. A plurality of heat-generating elements having different heat capacities that are energized to generate heat when the heat-sensitive switch section is turned on and do not generate heat when the heat-sensitive switch section is turned off, and are disposed outside the case, A switch contact provided on one terminal of each heating element, and a changeover switch arranged so that the switch contact of each heating element can be selected according to the load of the controlled member, Only the heating element of the switch contact selected by can be energized, and further, the power relay contact is connected to the outside of the case in parallel with the thermal switch part inside the case. Along with it, a power relay coil is connected in series with the thermal switch unit, a half-wave rectifying diode is connected in parallel with the thermal switch unit in the case outside the case, and a half-wave rectifying diode is connected outside the case in the case. LED protection resistor, LED protection diode and LE in series with the thermal switch
A temperature switch characterized by being connected to D.