KR101161757B1 - Temperature sensor for heating device used in water - Google Patents

Abstract

PURPOSE: A temperature sensor for a under water heater is provided to control the operation of the heater by accurately calculating an amount of fluid around a portion where the heater is arranged by minimizing measured capacitance data deviation. CONSTITUTION: A temperature sensor for a under water heater comprises a temperature sensor(52), a main substrate(54), a capacitance sensor(56), an auxiliary substrate(58), a signal line(68), and a molding member(60). A circuit processing sensed temperature data is mounted on the main substrate. A capacitance sensing circuit is mounted on the auxiliary substrate. The capacitance sensing circuit is electrically connected to the capacitance sensor, thereby processing the sensed capacitance data. The capacitance sensing circuit comprises an outer capacitance detecting unit, a reference capacitive terminal, and a comparison unit. The signal line transmits the data sensed by the temperature sensor and capacitance sensor to an external control circuit. The molding member supports the temperature sensor, the main substrate, the capacitance sensor, and a part of the auxiliary substrate to be integrated.

Description

Temperature Sensor for Heating Device {Temperature Sensor for Heating Device Used In Water}

The present invention relates to a temperature sensor and an underwater heating device for an underwater heating device, and more particularly, for an underwater heating device that greatly improves the safety of a heating device used in an aquarium or a microbial fermenter by detecting whether a heater is in the water. It relates to a temperature sensor and an underwater heating device.

Generally, in a fish tank, aquarium, water tank, seed germination, microbial fermenter, liquid fertilizer maker, simple water heater, etc., it is very important to maintain a constant temperature of water or liquid, and for this purpose, an underwater heater is used.

Conventionally, underwater heaters are used in such a way that the case is not used to directly contact with water or liquid, and a method in which the heater is mounted inside the case to improve safety.

Korean Utility Model Utility Model No. 20-2008-0005572, Utility Model Registration No. 20-0288311, Patent Publication No. 10-2003-0064698, Patent No. 10-2005-0111561, Patent No. 10-2011-0027622, etc. The structure of a heater is disclosed.

In the case of a conventional underwater heater, a temperature sensor is installed in order to prevent overheating of the heater and to measure a temperature of a heated liquid.

However, in the case of simply installing a temperature sensor for sensing the temperature, it is impossible to accurately detect and detect the sensor even when it is exposed to the air rather than underwater or liquid. May wear. In the case of the existing temperature sensor, whether the heater is operated according to the change in temperature, the heater is likely to operate even when exposed to the air due to cleaning of the tank, evaporation of liquid, breakage of the tank.

Therefore, in water heaters such as Korean Patent Nos. 10-2005-0111561 and 10-2011-0027622, water level sensors or liquid sensors are installed to prevent the heaters from being operated in the absence or absence of water or liquid. Doing.

In the case of Korean Patent Laid-Open Publication No. 10-2005-0111561, when the water level sensor is in the water, electricity is supplied, and when exposed to air, the contact is short-circuited and configured to detect the water level. However, in this case, not only is it difficult to detect due to the large amount and the amount of liquid, but the actual heater is exposed to the air, but there is a problem that the water level sensor installed separately from the heater cannot detect this.

In the case of Publication No. 10-2011-0027622, the specific configuration of the liquid detection sensor is not described, but it is assumed that it is made to simply detect whether the heater part is submerged in the liquid. In this case, there is a problem in that the control according to the amount of liquid is difficult.

SUMMARY OF THE INVENTION The present invention has been made in view of the above points, and provides a temperature sensor for an underwater heating apparatus capable of implementing the heater only when the amount of liquid is integrally installed by integrally installing the capacitance sensor. There is this.

Another object of the present invention is to provide a submersible heating device capable of efficiently controlling the operation of the heater by sensing the temperature of the liquid and the amount of liquid by integrally installing the capacitive sensor and the temperature sensor in a position close to the heater. It is for.

The temperature sensor for underwater heating apparatus according to an embodiment of the present invention is a temperature sensor for sensing the ambient temperature, the main board is electrically connected to the temperature sensor and a circuit for processing data of the sensed temperature, and the A plate-shaped capacitive sensor provided on one side of the main board and made of a conductor, and a capacitive sensing circuit installed on the opposite side of the main board's capacitive sensor and electrically connected to the capacitive sensor to process sensed capacitance data; An auxiliary substrate mounted and electrically connected to the main board, a signal line electrically connected to the main board and transmitting data sensed by the temperature sensor and the capacitive sensor to an external control circuit, the temperature sensor and the main board, Capacitive sensor, including a molding member for integrally wrapping and supporting the outside of the auxiliary substrate Lose.

If the plate-shaped capacitance sensor is installed in the above, it is possible to detect the amount of liquid in the surroundings by sensing the parasitic capacitance. That is, the value of the capacitance sensed by the capacitive sensor varies according to the amount of liquid in the surroundings.

The outer surface of the molding member is integrally provided with a plurality of access preventing wings to protrude to the outside at intervals along the circumference to prevent the conductor such as metal from approaching the capacitive sensor.

In addition, the underwater heating apparatus according to an embodiment of the present invention is a heater that generates heat when the power is supplied, a case surrounding the heater from the outside, and through the part of the case to supply power to the heater electrically to the heater It includes a power line to be connected, and a temperature sensor installed inside the case, the temperature sensor and the capacitance sensor is installed inside.

It is also possible to install a heater control unit that controls the power supplied to the heater and is electrically connected to the temperature sensor in the case of the part where the heater and the power line are connected.

The heater control unit includes a switch unit for intermitting the power of the heater, a temperature comparing unit for transmitting a signal for whether the power is interrupted to the switch unit by comparing the temperature data transmitted from the temperature sensor with a set reference value, and from the power line It comprises a power stabilization unit for stabilizing the power supplied to supply to the heater.

According to the temperature sensor and the underwater heating device for the underwater heating apparatus according to the embodiment of the present invention, since the auxiliary substrate is installed in close proximity to the plate-shaped capacitance sensor made of a conductor, it is connected to the circuit unit for processing the surrounding environment or capacitance data It is possible to minimize the distortion of the measured capacitance data as the length of the line becomes longer. Therefore, it is possible to control the operation of the heater by accurately tracking the amount of liquid around the heater location using the accurate capacitance data.

In addition, according to the temperature sensor and the underwater heating device for the underwater heating apparatus according to the embodiment of the present invention, since the access preventing wings are provided on the outside of the molding member, it is possible to effectively prevent the conductor approaching the capacitive sensor, and the precision It is possible to keep it high.

Furthermore, according to the underwater heating apparatus according to the embodiment of the present invention, since it is possible to install the heater control unit inside the case, it is possible to produce a simple mold to be used while moving at any time.

In addition, according to the underwater heating apparatus according to the embodiment of the present invention, since the temperature sensor is installed in a position close to the heater, accurate temperature control is possible, and it is possible to sufficiently secure the safety of the heater operation.

1 is a cross-sectional view showing an underwater heating apparatus according to a first embodiment of the present invention.
2 is a cross-sectional view showing the temperature sensor to be visible in the underwater heating apparatus according to the first embodiment of the present invention.
3 is a perspective view showing a temperature sensor for underwater heating apparatus according to a second embodiment of the present invention.
4 is a cross-sectional view showing a temperature sensor for underwater heating apparatus according to a second embodiment of the present invention.
5 is a circuit diagram illustrating an example of a capacitance sensing circuit mounted on an auxiliary substrate in a temperature sensor for underwater heating apparatus according to a second embodiment of the present invention.

Next, a preferred embodiment of the temperature sensor for underwater heating apparatus and the underwater heating apparatus of the present invention will be described in detail with reference to the drawings.

In the following description, the same reference numerals are used for description elements having the same function, and repeated descriptions will be omitted to avoid repeated descriptions.

The embodiments described below are shown by way of example in order to effectively show the preferred embodiments of the present invention, and should not be construed to limit the scope of the present invention.

The underwater heating apparatus according to the first embodiment of the present invention includes a case 10, a heater 20, and a temperature sensor 50, as shown in Figs.

The heater 20 is made of a material that generates heat when power is supplied.

For example, the heater 20 has a heating structure in which a heating wire composed of a nichrome wire, a carbon heating element, a ceramic heating element, a tungsten wire, or the like, which generates heat when power is supplied, is installed therein.

Since the specific configuration of the heater 20 can be generally applied to various structures used to heat the liquid, detailed description thereof will be omitted.

The case 10 is configured to surround and protect the heater 20 from the outside.

The case 10 may be configured to have a structure in which a plurality of holes are formed so that water or liquid directly contacts the heater 20 and is heated.

A power line 40 for supplying power is electrically connected to the heater 20.

The power line 40 penetrates through a part of the case 10 and is exposed to the outside, and is connected to an external power source.

It is also possible to install a heater control unit 30 in a portion where the power line 40 and the heater 20 is connected.

The heater controller 30 controls the power supplied to the heater 20.

The heater control unit 30 is electrically connected to the temperature sensor 50.

The heater control unit 30 may be installed in the case 10 in a part where the heater 20 and the power line 40 are connected.

The heater controller 30 has a switch unit 32 for controlling the power of the heater, and compares the temperature data transmitted from the temperature sensor 50 with a set reference value, the signal for whether to interrupt the power supply to the switch unit 32 And a temperature comparing unit 36 for transmitting the power supply stabilizer 34 to stabilize the power supplied from the power supply line 40 to the heater 20.

The temperature sensor 50 is installed inside the case 10.

As shown in FIGS. 1 and 2, the temperature sensor 50 is installed close to a portion where the power line 40 and the heater 20 are connected.

The temperature sensor 50 is preferably installed so that the part detected toward the heater 20 is exposed, since it is possible to accurately detect the temperature around the heater 20 and whether the heater 50 is submerged in liquid. .

In FIG. 2, reference numeral 80 denotes a support member for firmly supporting the connection portion of the heater 20 and the power line 40. The temperature sensor 50 and the heater control unit 30 are installed and supported on the support member 80.

And the temperature sensor for the underwater heating apparatus according to the second embodiment of the present invention, as shown in Figures 2 to 4, comprises a temperature sensor 52 and the capacitance sensor 56.

The temperature sensor 52 is configured to detect the ambient temperature (for example, the temperature around the heater 20).

The capacitive sensor 56 has a plate shape made of a conductor.

The capacitive sensor 56 may be formed in a flat plate shape or may be formed in a curved plate shape.

When the plate-shaped capacitance sensor 56 is installed in the above, it is possible to detect the amount of liquid in the surroundings by sensing the parasitic capacitance. That is, the value of the capacitance sensed by the capacitive sensor 56 varies according to the amount of liquid in the surroundings.

The temperature sensor 52 electrically connects the main board 54 equipped with a circuit for processing data of sensed temperature.

The main board 54 may be installed at a position close to the temperature sensor 52.

The capacitive sensor 56 is installed to be supported on one surface of the main board 54.

The sensitivity of the capacitive sensor 56 is designed based on the salinity of seawater, and it is preferable to design the liquid to smoothly detect 5 liters of liquid at a salinity of 5% or less.

An auxiliary substrate 58 is installed on the opposite side of the capacitive sensor 56 of the main substrate 54.

The auxiliary substrate 58 is equipped with a capacitive sensing circuit electrically connected to the capacitive sensor 56 to process data of the sensed capacitance.

The capacitive sensing circuit of the auxiliary substrate 58 is electrically connected to the main substrate 54.

For example, the capacitance sensing circuit mounted on the auxiliary substrate 58 may be configured as shown in FIG.

The external capacitance detecting unit 92 of the capacitance detecting circuit generates a frequency according to the capacitance value detected by the capacitance sensor 56.

The reference (internal) capacitive terminal 94 of the capacitive sensing circuit generates a frequency in accordance with the circuit power supply voltage. If necessary, it is also possible to change the output frequency (by voltage / frequency change rate) by varying the voltage (by the program value).

The frequency generated by the reference (internal) capacitive terminal 94 becomes a reference value (relative to the U1 circuit).

It is possible to more accurately check the presence or absence of the liquid by the capacitance detection by the change of the reference frequency in the above, to prevent the malfunction due to the deviation of the capacitance according to the amount and composition of the liquid, and to adjust the value according to the user's convenience It is also possible to design so that.

For example, the voltage may be fixed (5V) so that a reference frequency is generated constantly to determine whether liquid is caused by external capacitance.

The comparator 96 outputs the presence of liquid when the frequency U1 due to the external capacitance is larger than the reference frequency U2. The comparator 96 may be configured by a method of converting a frequency into a voltage level and comparing the frequency.

The main board 54 is electrically connected to a signal line 68 for transmitting data sensed by the temperature sensor 52 and the capacitance sensor 56 to an external control circuit.

A sealing finish portion 62 is formed at a portion where the signal line 68 and the main substrate 54 are connected to each other.

In addition, a bond type shrinkage tube 70 is installed outside the sealing finish portion 62.

The outside of the temperature sensor 52, the main board 54, the capacitive sensor 56, and the auxiliary substrate 58 are integrally wrapped and supported by the molding member 60.

By providing the capacitive sensor 56 and the auxiliary substrate 58 around the temperature sensor 52 and the main board 54 as described above, the length of the line from the sensing part to the circuit for processing data is shortened. Therefore, it is possible to minimize the change of data as the length of the line becomes longer, and it is possible to improve the precision.

In the temperature sensor for underwater heating apparatus according to the second embodiment of the present invention, the outer surface of the molding member 60 is projected to the outside at intervals along the periphery so that a conductor such as a metal toward the capacitive sensor 56. It is also possible to integrally install a plurality of access preventing wings 64 for preventing the proximity.

When the access preventing blade 64 is provided as described above, it is possible to minimize the occurrence of a change in the sensitivity of the capacitive sensor 56 by the conductor approaching the capacitive sensor 56.

When the height of the protruding wing 64 protrudes from the outer surface of the molding member 60 is 2 mm or more, it is possible to minimize the influence of the conductors on the capacitive sensor 56.

The molding member 60 is formed to have a thickness of 1 to 5 mm from the surface of the capacitive sensor 56.

The molding member 60 can be configured using an epoxy resin or the like.

The upper portion of the molding member 60 is connected to the sealing finish portion 62, and the lower end portion of the shrinkage tube 70 is configured to seal the outer surface of the upper end of the molding member 60.

By installing the sealing closing portion 62, the shrinkage tube 70, the molding member 60 as described above, the deformation according to the type and temperature of the external liquid in the connection portion of the signal line 68 and the main substrate 54, etc. Can be prevented.

And in the temperature sensor for the underwater heating apparatus according to the second embodiment of the present invention, as shown in Figures 3 and 4, the flange portion in the shape of a plate protruding outward along the periphery of the upper end of the molding member 60 It is also possible to form 66 integrally.

One or more hook holes 67 are formed in the flange portion 66.

When the flange 66 and the hook hole 67 are configured as described above, the structure of the heater 20 and the temperature sensor 50 are easily coupled, and the temperature sensor 50 is formed from the structure of the heater 20. It is possible to install in a fixed position so that) is not easily separated or detached.

When the temperature sensor 50 is fixedly installed in the state close to the structure of the heater 20 as described above, not only accurate temperature control is possible, but also it is possible to accurately detect the presence or absence of liquid near the heater 20. Therefore, safety is greatly improved.

In the above description of the preferred embodiment of the temperature sensor and the underwater heating apparatus for underwater heating apparatus according to the present invention, the present invention is not limited to this, and the invention is carried out by various modifications within the scope of the claims and the specification and the accompanying drawings It is possible and this also belongs to the scope of the present invention.

10-case, 20-heater, 30-heater control unit, 32-switch unit
34-Power Stabilizer, 36-Temperature Comparator, 40-Power Line
50-temperature sensor, 52-temperature sensor, 54-motherboard, 56-capacitive sensor
58-Auxiliary board, 60-Molding member, 62-Sealing finish, 64-Access guard wing
66-flange, 67-hook hole, 68-signal line, 70-shrink tube
92-external capacitance detector, 94-reference (internal) capacitive terminal, 96-comparator

Claims (13)

A temperature sensor which senses the ambient temperature, a main board that is electrically connected to the temperature sensor and processes data of the sensed temperature, and a plate-shaped capacitive sensor which is installed on one side of the main board and is made of a conductor And an auxiliary substrate mounted on an opposite side of the capacitance sensor of the main board, and equipped with a capacitive sensing circuit electrically connected to the capacitive sensor to process data of the sensed capacitance and electrically connected to the main board. Electrically connected to the main board, the signal line for transmitting the data sensed from the temperature sensor and the capacitive sensor to an external control circuit, and integrally wrap and support the outside of the temperature sensor and the main board, capacitive sensor, the auxiliary substrate Including a molding member,
The capacitive sensing circuit mounted on the auxiliary substrate includes an external capacitance detecting unit generating a frequency according to the capacitance value detected by the capacitive sensor, and a reference (internal) capacitive terminal generating a reference frequency according to the circuit power supply voltage. And a comparator for outputting a liquid when the frequency from the external capacitance detector is greater than the reference frequency. The method according to claim 1,
The outer surface of the molding member is a temperature sensor for underwater heating apparatus to integrally install a plurality of access preventing wings protruding to the outside at intervals along the circumference. delete The method according to claim 1,
A portion of the signal line and the main board is connected to the sealing finish portion formed of silicon or the like is formed,
Install a shrink tube on the outside of the sealing finish portion,
The lower end of the shrinkage tube temperature sensor for underwater heating apparatus is installed in close contact with the outer surface of the upper end of the molding member. The method according to claim 1,
Integrally forming a flange portion in a plate shape protruding outward along a circumference of an upper end portion of the molding member,
Temperature sensor for underwater heating apparatus to form at least one hook hole in the flange portion. delete delete delete delete delete delete delete delete

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