JP2967032B2 - Heater device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a heater for controlling the temperature of water in a water tank.

[0002]

2. Description of the Related Art Conventionally, for example, when aquariums such as tropical fish among aquatic animals and plants are grown in an aquarium, a heater is provided in the aquarium so that the water temperature is adjusted to the breeding temperature in order to match the aquarium with the breeding environment. Can be In addition, it is common practice to provide a temperature sensor such as a thermistor in a water tank, and to control on / off of a heater so as to maintain a water temperature at a target temperature of a growth temperature.

[0003] The temperature sensor is disposed separately from the heater in the water tank, or is disposed in the water tank integrally with the heater.

[0004]

However, although the temperature of the heater disposed in the water tank is controlled as described above, even if water does not exist in the water tank, the heater is controlled in accordance with the ambient temperature. The heater will be energized. For example, the water tank may fall down due to an earthquake or the like, and the water in the water tank may spill, or the heater may be thrown out of the water tank. When the heater is energized in this state, there is a problem that the temperature becomes extremely high. .

In view of the above, an object of the present invention is to provide a heater device in which energization is controlled depending on the presence or absence of water to be heated to improve safety.

[0006]

Means for Solving the Problems In order to solve the above problems, the present invention is characterized by taking the following means. According to the first aspect of the present invention, a heating element having water in the water tank as a target temperature is provided in the heater case, and a connection cord for supplying electricity to the heating element is extended from the heater case and connected to the heating driving means. In the heater device, the water to be heated is managed in order to manage the energization of the heating element .
A heater device, wherein an electrode for detecting the presence or absence is provided integrally on an outer periphery of the heater case and in a state of being exposed from the heater case. The invention according to claim 2 is the heater device according to claim 1, wherein the heater
A case, together with the electrodes, controls the water temperature in the water tank.
Temperature detecting means for controlling the driving of the heating element
Are provided integrally.

[0007]

As described above, in the first aspect of the present invention, an electrode for detecting water is provided integrally on the outer periphery of the heater case in which the heating element is provided. As a result, when there is no water to be heated, it is possible to automatically stop energization of the heating element, and it is possible to prevent an empty burning state due to an earthquake or the like and to improve safety. Become . Also, the electrodes are
By being integrated with the outer periphery, it is possible to reduce the size of the heater device . Also, check for the presence of water to be heated.
An electrode for controlling the energization of the heating element
Integrated with the outer periphery of the base and exposed from the heater case
The electrodes are directly detected for water
Can be issued. Therefore, when there is no water to be heated, it is possible to immediately stop energization of the heating element, and thereby it is possible to more reliably prevent abnormal heating of the heating element. In addition, electrodes are used as a means for detecting water.
Reliable response with simple configuration
The presence or absence of water can be detected with good efficiency. In addition,
In the invention according to claim 2, the temperature detecting means is provided integrally to control the water temperature.
Even when temperature control is performed, the water detection means
When electricity can be managed and safety can be improved
In both cases, the heater case is integrated with the electrode and temperature detection means
By doing so, it is possible to achieve compactness.

[0008]

[0009]

FIG. 1 shows a configuration diagram of a first embodiment of the present invention. In the heater device 11 shown in FIG. 1, for example, a heating element 13 such as a nichrome wire is provided in an internal space 12a of a heater case 12 formed of a ceramic tube. Heater case 12
Is filled with a sealing material 14a such as a silicone resin, and further covered with a rubber cap 15a, for example.
The one end portion is sealed. Heating element 13 in internal space 12a
Is located toward the other end of the heater case 12.

On the outer periphery of the other end of the heater case 12,
Two electrodes 16a and 16b, which are water detecting means, are attached. One end of each of the electrodes 16a and 16b is located on the outer periphery of the case, and the other end is located within the internal space 12a from one end of the heater case 12. . These electrodes 16a, 16
b may be any conductive material and may be made of metal or rubber, but is preferably of a material that does not easily undergo electrolysis.

On the other hand, a four-core cable 17 as a connection cord
Is arranged in the other end of the heater case 12, and the two-core cables 17 a ₁ and 17 a ₂ are respectively caulked (or may be soldered) to the connection portions 13 a and 13 b at the end of the heating element 13. Connected. The other two-core cables 17b ₁ and 17b ₂ are connected to the electrodes 16a and 16b, respectively.
Connection part 1 of the other end located in the internal space 12a of the 16b
They are connected by (which may be a or soldering) 6a ₁ 16b ₁ and caulking.

The other end of the heater case 12 is filled with a sealing material 14b such as a silicone resin, and further covered with, for example, a rubber cap 15b to seal the other end. That is, the heater case 12 in which the heating element 13 is provided has one end of the two electrodes 16a and 16b exposed at the other end, and is in a sealed state to prevent water from entering.

The other end of the 4-core cable 17 extending from the heater case 12 is connected to a 4-pin male connector 18a.
Is attached to form the heater device 11. The heater device 11 is provided with a control unit 21 provided as a heating drive unit including a unit for performing temperature control and the like.
The male connector 18a is fitted to the female connector 18b of the pin, and the electrical connection is made. That is, the heater device 11
Is interchangeable with the control unit 21,
For example, when the heater device 11 fails, a new heater device 11 having the same specification can be prepared and connected.

The shape of each of the electrodes 16a and 16b provided integrally with the heater case 12 in the heater device 11 is not particularly limited. In addition, any position may be provided, but a position where the heat generating portion of the heater case 12 enters and exits the water at the same time as entering and exiting the water is preferable. In this embodiment, the vicinity of the connection position of the four-core cable 17 is considered in consideration of productivity.

FIG. 2 shows an overall view of the use state of the present invention. FIG. 2 shows a case in which ornamental fish 24 such as tropical fish and aquatic plants 25 as aquatic animals and plants are grown in water 23 filled in an installed water tank 22. That is, the heater device 11 is arranged at the bottom of the water tank 22 filled with the water 23. Further, the heater device 11 is connected to a control unit 21 disposed outside the water tank 22 via a four-core cable 17.

Here, when water 23 to be heated is present in the water tank 22, the heater 23
The electrodes 16a and 16b are electrically connected, and the control unit 21 supplies electricity to the heating element 13 of the heater device 11 by detecting the water. On the other hand, when the water tank 22 falls down due to an earthquake or the like and the water 23 is spilled, and the heater device 11 is thrown out, air is interposed between the electrodes 16a and 16b, so that the electrodes become insulated. Upon detection of the absence of water, the control unit 21 stops supplying power to the heating element 13. Therefore, since the energization is controlled by the presence or absence of the water 23 to be heated, the empty heating state of the heater device 11 can be avoided, and the occurrence of a fire can be prevented, and safety can be improved. . Further, by integrating the heater case 12 and the electrodes, it is possible to reduce the size.

In the above embodiment, the heater device 1
The heat generating portion 1 may be formed in a plate shape or a panel shape. Alternatively, another sensor device that detects the presence or absence of water 23 by using light refraction using an LED (light emitting diode) or the like as the water detection unit may be used. Further, the heater device 11 may be directly connected to the control unit 21 without using a connector. The same applies to the second embodiment described later.

Next, FIG. 3 shows a configuration diagram of a second embodiment of the present invention. In the figure, the same components as those in FIG. 1 are denoted by the same reference numerals, and description thereof is omitted. Heater device 11 shown in FIG.
Is 6 as a connection cord extending from the heater case 12.
A core cable 31 is used. Among them, cable 31
_1, 31 ₂ is connected portion 13a of the end portion of the heating element 13, 13b
Is connected by caulking (or soldering) to the cable 3
1 _3, 31 ₄ electrodes 16a, 16b of the connecting portion 16a _1,
It is connected by 16b ₁ and caulking (or soldering).

The six-core cable 31 of the heater device 11
The inside side of the cap 15b is disposed a thermistor 32 is a temperature detecting means, the connecting portion 32a and the cable 31 _5, 31 ₆ of the thermistor 32 is connected by crimping (or soldering). 6 the other end of the wire cable 31 is connected to the corresponding six male pins 33 _to 333 ₆ of the male connector 33.

Meanwhile, the control unit 21, and the female connector 34 is provided corresponding to the male connector 33, the female connector 34 has a female pin 34 _{1-34 6} corresponding to the male pin 33 _to 333 ₆ . For example, female pin 3
4 _1, 34 ₂ and power supply to the heating element 13, the female pin 34 _3, 34 ₄ electrodes 16a, and a water detection 16b,
The female pins 34 _5, 34 _6, for detecting temperature of the thermistor 32. The other configuration is the same as that of FIG.

FIG. 4 shows a drive circuit diagram of the second embodiment. The drive circuit 41 shown in FIG.
And a water detection circuit 43.
Is a generally known circuit. That is, if the temperature control circuit 42 is briefly described, an AC power supply (for example, AC
100V) AC lines 44a, 4
A is AC100V-based line 44c between 4b, is connected to AC line 44a of the three-terminal bidirectional side thyristor (triac) 45, together with the neon lamp 46 is connected to one terminal T ₂ of the main electrodes, the female pin 34 ₁ (the male pin 33 ₁ to be connected) is connected. The AC line 44b is female pin 34 ₂ (male pin 33 ₂₎ is connected, the heating element 13 of the heater device 11 is a connected state between the male pin 33 _1, 33 ₂ (female pins 34 _1, 34 ₂₎ .

The AC lines 44a and 44b after the AC100 system line are connected to a smoothing capacitor C ₁ and a diode D
_1, and a resistor R ₁ is configuration connected to DC line 44d, DC voltage in accordance with the resistance value of the resistor R ₁ is set (e.g., DC 7V) relative to AC100V. The DC system line 44d is connected to an IC 47 for performing a temperature control process, and the IC 47 is connected to a supplied power supply voltage (DC7).
V), there is provided a function to stop the operation when the voltage falls below a predetermined value (for example, DC 5 V or less).

A signal corresponding to the water temperature is input to the IC 47. A basic bridge circuit is formed by the resistance R _TH and the resistance R ₂ of the thermistor 32 and the variable resistor VR ₁ for adjustment. Is input as a signal. Both ends of the line of the thermistor 32 on the circuit is connected to the female pins 34 _5, 34 ₆ (male pins 33 _5, 33 _6).

The IC 47 supplies a predetermined signal to the gate G of the thyristor 45 via the resistor R in response to a signal from the bridge circuit, thereby turning the thyristor 45 off or on. Heating element 13
It controls the phase of the supply voltage to the power supply.

On the other hand, the water detecting circuit 43, while via the resistor R ₄ electrodes of DC-based line (DC 7V) 44d 16
a is connected to a female pin 34 ₃ (male pin 33 ₃ ) to be connected, and the other is connected via a resistor R ₅ to a female pin 34 ₄ (male pin 33 ₄ ) to which the electrode 16 b is connected. This resistance R
_4, R ₅ are electrodes 16a, 16b of the high resistance that is used to have suppress the current which flows when conducting.

Further, with the inter-DC system line (DC 7V) 44d transistor to Q ₁ NPN type is connected in the forward direction through the resistor R _7, P in the forward direction through the resistor R ₈
NP-type transistor Q ₂ is connected to. The collector of the transistor Q ₂ is intended to bias is connected to the base of the transistor Q _1, the transistor Q ₂ of the base electrode 16a, it is biased from 16b. The resistance R
₈ , R ₉ and capacitor C ₂ are for protection.

In such a driving circuit 41, assuming that DC7V is supplied through the DC system line 44d,
If water 23 is present in the water tank 22, the electrode 16
a, 16b is conductive, the transistor Q ₂ is turned off. Thus the transistor Q ₁ is also turned off, DC line system maintains a DC 7V. Therefore, I
C47 outputs a signal to the gate G of the thyristor 45 in response to the detection of the water temperature by the thermistor 32 integrally provided in the cap 15b of the heater device 11, controls the state of energization to the heating element 13, and controls the normal temperature of the water temperature. Perform temperature control.

On the other hand, if the heater device 11 at an earthquake or the like is not located in water, electrodes 16a, 16b becomes the insulation state, the transistor Q ₂ is turned on. Thus the voltage of the DC line system by the voltage drop at the resistor R ₆ is a transistor Q ₂ is turned on is decreased. The magnitude of the voltage drop Sadamari by the resistance value of the resistor R _6, for example, DC
It is set to be 5 V or less.

Therefore, the operation is stopped due to a decrease in the voltage supplied to the IC 47, no signal is sent to the gate G of the thyristor 45, and the power supply to the heating element 13 is stopped. . Thus, the heating element 1
Even when the temperature of the tank 3 is controlled, the water tank 2 may be
Even if the water 2 is overturned and the water 23 is spilled and the heater device 11 is thrown out, the power to the heater device 11 is stopped, so that the occurrence of fire can be prevented and the safety can be improved. Can be done. In addition, by integrating the heater case 12, the electrodes 16a and 16b, and the thermistor 32, the size can be reduced.

In the above embodiment, the heater device 11 used for the water tank for growing aquatic animals and plants has been described. However, the heater apparatus 11 can be applied to a water tank used for a water resistance test or other purposes. is there.

[0031]

As described above, according to the first aspect of the present invention, the water detecting unit is provided integrally with the outer periphery of the heater case in which the heating element is provided .
An electrode is provided. As a result, when there is no water to be heated, it is possible to automatically stop energization of the heating element, and it is possible to prevent an empty burning state due to an earthquake or the like and to improve safety. Become . Also, if the electrode is a heater
By integrating the heater device with the outer periphery of the base, the heater device can be made compact. Also, if there is water to be heated
The electrodes for detecting the absence and managing the energization of the heating element
Exposed from the heater case integrally with the outer periphery of the heater case
The electrode is directly in contact with water
Nothing can be detected. Therefore, when there is no water to be heated, it is possible to immediately stop energization of the heating element, and it is possible to more reliably prevent abnormal heating of the heating element. As a means for detecting water,
With the configuration using poles, is it simple and reliable?
The presence or absence of water can be detected with good responsiveness. Ma
According to the invention of claim 2, the temperature detecting means is provided integrally.
Heat generation by water detection means even when controlling water temperature
It is possible to improve the safety by controlling the energization of the body
And the heater case, the electrodes and the temperature detecting means.
It is possible to achieve compactness by integrating
You.

[0032]

[Brief description of the drawings]

FIG. 1 is a configuration diagram of a first embodiment of the present invention.

FIG. 2 is an overall view of a use state of the present invention.

FIG. 3 is a configuration diagram of a second embodiment of the present invention.

FIG. 4 is a drive circuit diagram of a second embodiment.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 11 Heater device 12 Heater case 12a Internal space 13 Heating element 16a, 16b Electrode 17 4-core cable 18a Male connector 18b Female connector 21 Control unit 22 Aquarium 23 Water 24 Ornamental fish 25 Aquatic plant 31 6-core cable 32 Thermistor 33 Male connector 34 Female connector 41 drive circuit 42 temperature control circuit 43 water detection circuit

──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-2-219950 (JP, A) JP-A-6-292483 (JP, A) JP-A-3-107657 (JP, U) 2554 (JP, Y2) (58) Fields investigated (Int. Cl. ⁶ , DB name) A01K 63/00-63/06 F24H 1/18 303

Claims (2)

(57) [Claims] 1. A heater device in which a heating element having a target temperature of water in a water tank is provided in a heater case, and a connection cord for energizing the heating element extends from the heater case and is connected to heating driving means. In the above- mentioned water to be heated in order to manage the energization of the heating element
A heater device, wherein an electrode for detecting the presence or absence of the heater case is provided integrally on the outer periphery of the heater case and in a state of being exposed from the heater case. (2) The heater device according to claim 1, In the heater case, together with the electrodes, the water in the water tank
A temperature for controlling the driving of the heating element to control the temperature.
Wherein the temperature detecting means is provided integrally.
apparatus.