KR101465144B1 - Heating line control device for anti-freezing and heating line control system having the same - Google Patents

Abstract

The present invention relates to a heating line control device for anti-freezing and a heating line control system having the same. More particularly, the present invention relates to a heating line control device for anti-freezing to control power supplied to a heating line, and a heating line control system having the same. A heating line control device for anti-freezing and a heating line control system having the same according to an embodiment of the present invention include a case which has a power cable which supplies power to a heating line; a power supply part which supplies power supplied from a power supply terminal groove to the heating line through the power cable; a first temperature detection sensor which detects the temperature of a pipe; and a second temperature detection sensor which detects external temperature.

Description

TECHNICAL FIELD [0001] The present invention relates to a heating wire control apparatus for preventing freezing of a hair, and a heating wire control system including the heating wire control apparatus.

One embodiment of the present invention relates to a heat ray control apparatus for preventing a frost wave to control a heat ray provided in a mechanical piping and a heat ray control system having the same.

Generally, the occurrence of the frost in various parts of the piping exposed to the outside of the apartment building or the parking lot of the building occurs when the outside air temperature down to zero is transmitted to the piping to freeze the fluid inside the piping.

In recent years, in order to prevent freezing of piping, electricity is supplied to a hot line provided outside the piping to prevent the piping exposed to the outside from freezing.

More specifically, the conventional pipeline freeze prevention apparatus includes a circuit breaker, an external temperature sensing regulator, a magnetic contactor, and a hot wire. When the external temperature set by the external temperature sensing controller falls below 5 to 10 degrees, Respectively. However, in order to generate a wave in the pipe, it is necessary to lower the temperature in the pipe to 0 degree or less. Therefore, since the conventional piping freezing prevention apparatus senses only the external temperature as described above and the electricity is supplied thereto, electricity can be supplied all the day, regardless of the day and night, and unnecessary power is wasted . Further, in the conventional pipeline freeze prevention device, even if a short circuit occurs in the hot wire or an abnormality occurs in the circuit, the manager can know the temperature after the freeze wave, and the temperature inside the pipe is increased to 85 degrees . In addition, there is a problem in that the electric power is supplied to the hot wire in anticipation of ripping only by the external temperature, so that a great amount of electricity is consumed and it is not compatible with the current energy saving measure.

Open Utility Model Publication No. 20-2010-0007182 'Electric power saving device of heat ray device for preventing frost' Open Patent Publication No. 10-2005-0104879 " Anti-icing device for antenna using hot wire "

An embodiment of the present invention provides a hot-wire control apparatus for preventing power from being supplied to a hot-wire provided in a pipe for preventing freezing and a hot-wire control system including the same, which is connected to a pipe for supplying a fluid to various mechanical equipments do.

The heating wire control device for preventing freezing of hair according to an embodiment of the present invention is a heating wire control device connected to a pipe for supplying fluid to various kinds of mechanical equipment and for adjusting the power supplied to the heating wire provided in the pipe for preventing freezing, A power supply unit for supplying power from the outside to the hot wire; A temperature sensing unit including a first temperature sensor for sensing a temperature of the pipe and a second temperature sensor for sensing an external temperature of the heat pipe control unit; A power cutoff unit for shutting off power supply to the hot wire according to the detection result of the first temperature sensor; A standby power cutoff unit for shutting off standby power of the hot-wire control apparatus according to the detection result of the second temperature sensor; And interrupting the standby power when the external temperature sensed by the second temperature sensor is out of the first reference temperature value by controlling the operation of each component, When the temperature of the pipe detected by the first temperature sensor is out of the second reference temperature value in the on state, the control unit turns on the power cutoff unit to supply power to the hot wire, The intensity of the power supplied to the hot wire can be controlled by the temperature control program to be proportional to the temperature of the pipe sensed by the first temperature sensor.

The controller may reduce the magnitude of the current flowing in the hot line to be less than or equal to a reference current magnitude per predetermined hot line length.

The thermal conduction control device for preventing freezing of the hair further includes a display unit including a plurality of status indicator lamps, wherein the display unit includes a power indicator for indicating whether power is supplied from the power supply unit to the control unit; An operation indicator for indicating whether power is supplied from the controller to the hot wire; A leakage indicator for indicating whether or not a short circuit has occurred in the hot or hot wire control device; And an alarm indicator for indicating a danger occurrence signal when an overload or overheating occurs in the heat or heat ray control apparatus.

The power indicator is connected between the power supply unit and the standby power cutoff unit to indicate whether power is supplied from the power supply unit to the control unit even when the standby power cutoff unit is turned off and the standby power is cut off .

Wherein the control unit comprises: a communication unit for transmitting and receiving data with an external device; A first determination unit for determining whether an external temperature sensed by the second temperature sensing sensor is out of a first reference temperature value; A second determination unit for determining whether the temperature of the pipe detected by the first temperature sensor is out of a second reference temperature value; A current detector for detecting a magnitude of a current flowing through the hot wire; An overcurrent suppressing unit for limiting the current flowing through the corresponding hot line to a reference current value per hot line length by using the magnitude of the detected current; A temperature regulator for regulating an intensity of power supplied to the hot wire in proportion to a temperature of the pipe sensed by the first temperature sensor; A memory unit for storing the first reference temperature value, the second reference temperature value, the reference current value for the hot line length, and the temperature control program; And a power control unit for controlling the operation of each component according to a result output from the first determination unit, the second determination unit, and the current detection unit.

The controller may further include a leakage determination unit for determining whether the hot wire is short-circuited based on the magnitude of the detected current.

In addition, the heat conduction control system for preventing freeze damage, which includes the thermal conduction preventing heat wave control device, includes a plurality of heat wave control heat conduction devices to which respective device numbers are assigned; And a plurality of heat wave control heat conduction devices for receiving the operation state information and the heat conduction control information from the plurality of heat wave prevention heat conduction control devices, And the central monitoring unit can form a communication channel using the RS-485 communication method, respectively.

The heat-ray control apparatus for preventing freeze damage according to an embodiment of the present invention and the heat-ray control system having the same can reduce energy by shutting off standby power according to the external temperature and proportionally adjust power supplied to the heat- Can be kept constant.

Also, an embodiment of the present invention can prevent the occurrence of an overcurrent in the piping through the setting of the overcurrent suppression according to the length of the heat line provided in the piping.

According to an embodiment of the present invention, a device is set to each of the heat-ray-blocking heat-ray-controlling devices and is connected to the central monitoring panel through a communication channel, so that the user can efficiently monitor the respective heat-ray-blocking heat-

FIGS. 1A to 1C are views showing a model of a heat-ray-controlling apparatus for preventing freezing according to an embodiment of the present invention.
FIG. 2 is a block diagram schematically showing a heat-ray-controlling device for preventing freeze of the wind, which is provided inside the case of FIG. 1A.
Fig. 3 is a circuit diagram schematically showing an example of the heat-ray control apparatus for preventing freeze of motion shown in Fig. 2. Fig.
4 is a block diagram schematically showing the control unit of Fig.
5 is a view schematically showing a heat ray control system for preventing freezing according to another embodiment of the present invention.

DETAILED DESCRIPTION OF EXEMPLARY EMBODIMENTS Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings, in which those skilled in the art can readily implement the present invention.

FIG. 2 is a block diagram schematically showing a heat-ray-controlling device for preventing freezing of the wind, which is provided inside the case of FIG. 1A; FIG. 2 3 is a circuit diagram schematically showing an example of a heat ray control apparatus for preventing freeze of hair shown in Fig. 2, and Fig. 4 is a block diagram schematically showing a control section of Fig.

The heat-ray control apparatus 1 for preventing frost damage according to an embodiment of the present invention is connected to a pipe for supplying fluid to various kinds of mechanical equipment and is a device for adjusting power supplied to a hot wire wound around a pipe for preventing freezing. In addition, the hot wire in the present invention is wound around piping in a position where there is a concern that the fluid inside the pipe is frozen during the winter season and is likely to be frozen, in piping connected to various mechanical equipments provided in a building or the like.

As shown in Figs. 1A to 1C, the thermal conduction preventing device 1 for preventing freeze is provided with a hexagonal front face portion and a rear face portion, and a case including first to sixth side walls connecting the side portions of the front face portion and the rear face portion 10). A side wall of each of the first to sixth sidewalls of the case 10 is provided with a ventilation hole 12 for ventilating the heat generated inside the case 10, A vent cover (11) is provided on the side wall. The upper side wall adjoining the side wall provided with the ventilation port 12 or the vent cover 11 is provided with a power supply terminal groove 13 for receiving power from the outside (for example, the central monitoring panel 1000 in FIG. 5) And a communication terminal groove 14 for transmitting / receiving data to / from the outside. A connection pipe 21 connected to the pipe 20 is provided on the lower side wall of the case 10 and a power cable connected to the hot wire 30 to supply power is provided inside the connection pipe 21. A plurality of status indicators 151, 152, 153 and 154 and temperature indicators 155 and 156 may be provided on the front surface of the case 10. In the present invention, the positions of the structures provided on the front, rear, and side walls of the case 10 are not limited to those shown in FIGS. 1A to 1C but may be variously modified by a designer.

2, the thermal conduction preventing device 1 for preventing frost damage includes a power supply unit 110, a temperature sensing unit 120, a power shutoff unit 130, a standby power shutoff unit 140, a display unit 150, And a control unit. Here, the power supply unit 110, the power cutoff unit 130, the standby power cutoff unit 140, and the control unit 150 may be implemented as one printed circuit board or a plurality of printed circuit boards in the case 10, A plurality of electronic elements or the like may be provided on the substrate.

The power supply unit 110 supplies a power supply (that is, a commercial power supply) Although not shown, the power supply unit 110 may include a rectifying unit for rectifying the AC power applied from the outside to a direct current, and a constant voltage unit for maintaining the voltage of the rectified direct current power at the rectifying unit at a uniform voltage.

The temperature sensing unit 120 includes a first temperature sensing sensor 121 installed at the outer circumference of the pipe 20 to sense the temperature of the pipe 20, And a second temperature sensing sensor 122 for sensing an external temperature of the second temperature sensor. The first temperature sensing sensor 121 and the second temperature sensing sensor 122 are electrically connected to the controller 150 to provide the sensed external temperature and the temperature in the pipe 20 to the controller 150, The control unit 150 interrupts the standby power based on the external temperature so that the power supplied to the heat line 30 can be proportionally controlled based on the temperature in the pipe 20. [ Accordingly, in the present invention, energy can be saved by keeping the temperature in the pipe 20 constant, compared with the conventional technique of supplying or cutting off power to the hot wire 30 based only on the external temperature. Meanwhile, the first temperature sensor 121 is installed on the outer circumference of the pipe 20 by tape or other means.

The power cutoff unit 130 is connected to the power supply unit 110 and the standby power cutoff unit 140 so as to cut off the power supply to the heating line 30. The first power cutoff unit 130 includes a first temperature detection sensor 121, The power supply to the heating wire 30 is cut off. The power cutoff unit 130 may be turned on when the temperature of the pipe 20 detected by the first temperature detection sensor 121 is out of the second reference temperature value while the standby power cutoff unit 140 is on . Accordingly, the power cut-off unit 130 may be operated when there is a short circuit due to an abnormality on the side of the load (i.e., the hot line 30) while the power is turned on, thereby cutting off the power supply to the hot line 30. In the present invention, when an error occurs on the side of the load (that is, the heat line 30) while the power is turned on to cause a short circuit, the power supply to the heat line 30 is cut off and the alarm display 154), it is possible to prevent the occurrence of freezing of the vehicle by relatively visualizing or communicating with the conventional apparatus which can not recognize the occurrence of the frost if the administrator does not confirm the control panel even if the earth leakage breaker is shut off due to leakage, Can be easily recognized.

The standby power cut-off unit 140 is a switching device connected between the power cut-off unit 130 and the control unit 150 to cut off standby power in the control unit 150. The standby power cut- The standby power of the hot wire control device is cut off. The standby power cut-off unit 140 can cut off all the power sources except for the power indicator 151 when the external temperature deviates from the first reference temperature value even when power is supplied to the controller 150, do.

The display unit 150 may be an LCD (Liquid Crystal Display), a LED (Light Emitting Diode), an OLED (Organic LED), or the like for displaying the operation state of the heat ray control device and the external temperature and the pipe temperature.

The display unit 150 includes a power indicator 151 indicating whether power is supplied from the power supply unit 110 to the controller 150 and a power indicator 151 indicating whether power is supplied from the controller 150 to the hot wire 30 A leakage light indicator 153 for indicating whether or not there is a short circuit inside the heating wire 30 or the heating wire control device and an operation indicator lamp 152 for indicating a risk of overload or overheating in the heating wire 30 or the heating wire control device An alarm display lamp 154 for displaying a signal, an external temperature display window 155 for digitizing and displaying the external temperature, and a pipe temperature display window 156 for digitizing and displaying the pipe temperature.

At this time, the power indicator 151 is connected between the power supply unit 110 and the standby power cutoff unit. Accordingly, even when the standby power interruption unit is turned off and the standby power is interrupted, it is possible to indicate whether power is supplied from the power supply unit 110 to the control unit 150. [

Accordingly, in the present invention, even when the power is supplied to the controller 150, the power consumption is reduced without any power consumption other than the power indicator 151 which is turned on on the load side and the internal circuit.

The control unit 150 controls the operation of each component so that the external temperature sensed by the second temperature sensor 122 is a first reference temperature value (for example, images 3 to 5 in winter) The standby power cutoff unit 140 is turned off to cut off the standby power so that the temperature of the pipe 20 detected by the first temperature detection sensor 121 in the standby power cutoff unit 140 is in the second (For example, 0 to 2 degrees in the winter)), the power cutoff unit 130 is turned on to supply power to the hot wire 30. The control unit 150 controls the intensity of the power supplied to the hot wire 30 to be proportional to the temperature of the pipe 20 sensed by the first temperature sensor 121 by a preset temperature control program . In addition, the controller 150 can reduce the magnitude of the current flowing through the heating wire 30 to a predetermined current magnitude or less.

In order to implement this operation, the control unit 150 includes a communication unit 161, a first determination unit 162, a second determination unit 163, a current detection unit 164, an overcurrent suppression unit 165, 166, a memory unit 167, a leakage determination unit 168, and a power control unit 169.

The communication unit 161 is a device for transmitting and receiving data with an external device (that is, the central monitoring unit 1000 in FIG. 5), and is connected to an external device through an RS-485 communication method. However, in the present invention, the type of the communication unit 161 is not limited, and various types of communication units such as TCP / IP, HyperText Transfer Protocol (HTTP), Wireless Application Protocol (WAP) / Mobile Explorer (ME), WiFi A wired / wireless communication method such as a zigbee method, a bluetooth method, 3G, 4G, LTE, LTE-A, and the equivalent method may be applied.

The first determination unit 162 determines whether the external temperature sensed by the second temperature sensor 122 is out of the first reference temperature.

The second determination unit 163 determines whether the temperature of the pipe 20 detected by the first temperature sensor 121 is out of the second reference temperature value.

The first determination unit 162 and the second determination unit 163 are connected to the second temperature sensor 122 and the first temperature sensor 121 to detect a value sensed by each sensor as a digital data value And transmits the result to the power adjustment unit.

The current detector 164 is connected in parallel to the heating wire 30 to detect the magnitude of the current flowing through the heating wire 30. It is preferable that the current detection unit 164 is connected to the heating wire 30 in parallel per unit length (for example, 2 m) set in advance.

The overcurrent suppression unit 165 limits the current flowing through the corresponding heating line 30 to a reference current value per heating line length by using the magnitude of the current detected by the current detection unit 164.

That is, the overcurrent suppressing unit 165 can prevent the occurrence of the overcurrent by presetting the detected current value according to the length of the installed heat ray. The overcurrent can be suppressed through the overcurrent suppressing unit 165 in order to overcome the problem of the conventional device which can not interrupt the current other than the breaker even if the overcurrent is generated by only the simple ON / OFF control by the detection of the temperature sensor , The stability of the apparatus can be improved.

The temperature adjusting unit 166 adjusts the intensity of the power supplied to the heating wire 30 to be proportional to the temperature of the pipe 20 sensed by the first temperature sensing sensor 121. Accordingly, in the present invention, since the temperature of the pipe 20 is supplied from the first temperature sensor 121 and the load side power is controlled to be proportional thereto, the temperature in the pipe 20 can be kept constant, .

The memory unit 167 stores a first reference temperature value, a second reference temperature value, a reference current value per a heat ray length, and a temperature control program. The memory unit 167 may be a RAM, a ROM, an electrically erasable programmable read only memory (EEPROM) A synchronous dynamic random access memory (SDRAM), or a hard disk drive (HDD). However, the present invention is not limited to the type of the memory unit 167. The memory unit 167 stores a program and the like necessary for the overall control and execution of the present hot-wire control apparatus.

The leakage determining unit 168 determines whether or not the heating wire 30 is short-circuited based on the magnitude of the current detected by the current detecting unit 164. That is, the leakage determination unit 168 detects a short circuit to be generated in the heat ray 30 due to a problem of organic materials, moisture, or heat ray damage due to the manufacturing process of the heat ray 30 or the surrounding environment.

The power control unit 169 controls the operation of each component according to the results output from the first determination unit 162, the second determination unit 163, and the current detection unit 164. That is, when the external temperature detected by the second temperature sensor 122 is out of the first reference temperature value, the power controller 169 turns off the standby power cutoff unit 140 to cut off the standby power, When the temperature of the pipe 20 sensed by the first temperature sensor 121 deviates from the second reference temperature value while the cutoff unit 140 is turned on, the power cutoff unit 130 is turned on, And controls the intensity of the power supplied to the hot wire 30 to be proportional to the temperature of the pipe 20 sensed by the first temperature sensor 121 and controls the intensity of the power supplied to the hot wire 30 The magnitude of the flowing current can be suppressed to be equal to or smaller than the reference current magnitude per predetermined hot line length.

According to an embodiment of the present invention constructed as described above, the heat-ray control apparatus 1 for preventing freezing can cut off standby power according to the external temperature to save energy, and the power supplied to the hot wire 30 is proportional to the pipe temperature The temperature of the pipe 20 can be maintained constant and the overcurrent can be prevented from being generated in the pipe 20 by setting the overcurrent suppression according to the length of the heat line provided in the pipe 20. [

5 is a view schematically showing a heat ray control system for preventing freezing according to another embodiment of the present invention.

As shown in FIG. 5, in the heat ray control system for preventing freezing of hair according to another embodiment of the present invention, the heat ray control system for preventing freeze is provided with a plurality of freeze prevention heat ray control devices 1a to 1e to which respective device numbers are assigned, And a plurality of heat conduction control devices 1a to 1e for receiving the operation state information and the heat conduction control information from the plurality of heat conduction control devices 1a to 1e for establishing communication channels with the plurality of heat conduction control devices 1a to 1e, And a central monitoring unit 1000 for monitoring and controlling the operation of the heat-ray control devices 1a to 1e for preventing the freeze of the frost.

In the heat conduction control system for preventing the freeze of winter, the conduit 20 wrapped around the heat wire 30 is divided into zones to be managed, and the heat conduction controlling devices 1a to 1e for preventing the freezing of the parts shown in FIGS. It is possible to monitor and control the operation of the hot-wire control devices 1a to 1e in the area.

For this purpose, the plurality of hot-wire control devices 1a to 1e are connected to the central monitoring unit 1000 through respective unique channels. The central monitoring unit 1000 may be provided with a frequency coinciding with a channel of each of the heat-ray control devices, so that the central monitoring unit 1000 can simultaneously communicate with each other.

The plurality of the heat-ray controllable heat-ray control devices 1a to 1e and the central monitoring unit 1000 can form communication channels using the RS-485 communication method. However, the present invention does not limit the types of communication methods between the plurality of coagulation preventing heat-ray control devices 1a to 1e and the central monitoring unit 1000, but may be applied to other types of communication devices such as TCP / IP, HTTP, WAP / ME, Wi- A Bluetooth, a 3G, a 4G, an LTE, an LTE-A, and an equivalent method.

Accordingly, in the present invention, the device numbers are set to each of the heat-ray-shielding heat-ray control devices 1a to 1e, and are connected to the central monitoring unit 1000 through the RS-485 communication method. Thereby enabling efficient monitoring and monitoring.

On the other hand, the case 10 may be made of a polyolefin resin composition containing 25 to 39% by weight of an olefin resin, and 61 to 75% by weight of an inorganic filler which is glass fiber or barium sulfate or a mixture thereof.

The olefin-based resin preferably contains 25 to 39% by weight of the ultrafine crystalline resin and improves the flowability of the inorganic filler and improves the heat resistance, rigidity and thermal deformation of the polyolefin resin composition. When the amount of the inorganic filler is less than 25% by weight, the inorganic filler is excessively used to lower the flowability and moldability of the resin. If the amount is more than 39% by weight, the injection molded product is not effective in improving the strength, impact resistance and dimensional stability I have a problem. Specifically, the ultra-crystalline olefin-based resin may be an isotactic polypropylene, a propylene-ethylene copolymer, a propylene-1-butene copolymer, a propylene-1-hexene copolymer and a propylene- Polymer, and a copolymer or random copolymer of propylene or a mixture thereof.

The olefin resin preferably has a melt index of 1 to 70 g / 10 min (230 ° C), more preferably 3 to 30 g / 10 min.

It is preferable that the isotactic peptad fraction of the homo part in the olefin resin is 96 to 99% by C13-NMR. If it is less than 96%, the heat resistance, rigidity and heat change of the polyolefin resin composition are deteriorated .

The inorganic filler is preferably glass fiber, barium sulfate, or a mixture thereof. The inorganic filler includes 61 to 75% by weight of the inorganic filler and improves strength and impact resistance during injection molding. If the amount of the inorganic filler is less than 61% by weight, the strength and impact resistance are lowered and the problem is caused by the low weight. When the inorganic filler is more than 75% by weight, the production process is not smooth due to high weight and high rigidity.

The glass fiber preferably has a chopped strand shape having an average particle diameter of 5 to 15 탆 and a length of 1 to 16 mm. When the average particle diameter is less than 5 탆, the glass fiber tends to be broken during mixing The stiffness effect is insufficient. When the thickness exceeds 15 탆, the deformation of the molded article may be deteriorated and the appearance of the molded article may be deteriorated. If the length is less than 1 mm, the strength, impact resistance and weight are lowered. If the length is more than 16 mm, it is difficult to input the material in the processing step. Specifically, it is preferable that the glass fiber is a glass fiber whose surface has been treated with a modified polypropylene obtained by grafting an unsaturated carboxylic acid or its anhydride. In the case of injection molded articles, the strength, impact resistance and heat resistance of the molded article are improved . The unsaturated carboxylic acid is preferably one selected from the group consisting of acrylic acid, tricrylic acid, maleic acid, fumaric acid, itaconic acid, crotonic acid, ditralic acid, sorbic acid and phosphoric acid, and the anhydride is preferably an acid anhydride, an ester, And metal salts, and specific examples thereof include maleic anhydride, itaconic anhydride, anhydrodithioconic acid, sodium acrylate, and sodium methacrylate. In order to treat the surface of the glass fiber, it is preferable to use a modified polypropylene prepared by charging an unsaturated carboxylic acid or its anhydride and a catalyst to a crystalline polypropylene into a twin-screw extruder and melting by heating at 180 to 220 ° C , The modified polypropylene and the glass fiber are preferably treated at a ratio of 1: 9.

The barium sulfate preferably has an average particle diameter of 0.5 to 1 μm by laser diffraction scattering. When used in combination with glass fibers, the barium sulfate plays an effective role in exhibiting high weight characteristics. If less than 0.5 μm, high weight and high rigidity properties And it is difficult to inject in the processing step. When the thickness exceeds 1 탆, there is a problem that the gloss of the surface appearance of the molded article is lowered during the production of an injection molded article.

When the glass fiber and barium sulfate are mixed and used as an inorganic filler, the mixing ratio of glass fiber and barium sulfate is preferably 2: 8 to 8: 2, more preferably 4: 6 to 5: 5.

In addition, the polyolefin resin composition can be applied based on the production method and processing conditions of the resin composition known in the art. For example, polypropylene may be blended at the melting point or higher and used. That is, the polyolefin resin composition may be used for producing the case 10 through a conventional molding method such as injection molding and extrusion molding.

Hereinafter, the polyolefin resin composition will be described by way of examples.

≪ Examples 1 to 4 and Comparative Examples 1 to 4 >

The olefin resin and the inorganic filler were charged into a hopper of a kneading extruder after being dry blended in a ribbon mixer for 0.5 to 4 hours and melt kneaded at 180 to 220 ° C. to prepare a polyolefin resin composition. Are shown in Table 1 below.

Category (% by weight) Example 1 Example 2 Example 3 Example 4 Comparative Example 1 Comparative Example 2 Comparative Example 3 Comparative Example 4 Olefin resin 39 30 25 39 100 70 46 70 weapon
Filler Fiberglass-1 31 30 30 - - 30 - - Fiberglass-2 - - - 21 - - - - Fiberglass-3 - - - - - - - 30 Barium sulfate 30 40 45 40 - - 54 -

(1 to 70 g / 10 min, ethylene unit content: 10.5 mol%, isotactic peptad fraction: 96 to 99%) was used as the olefinic resin, and the glass fiber-1 The glass fiber-2 has an average particle diameter of 9 to 13 탆 and a length of 10.0 to 15.0 mm, and the glass fiber-3 has an average particle diameter of 28 to 32 탆 , And a length of 3.0 to 4.5 mm is used.)

<Test Example>

In order to measure the mechanical properties of the polyolefin resin compositions prepared through Examples 1 to 4 and Comparative Examples 1 to 4, specimens were produced by injection molding at a mold temperature of 70 ° C. and an injection pressure of 60 to 100 bar. The results are shown in Table 2 below.

division Example 1 Example 2 Example 3 Example 4 Comparative Example 1 Comparative Example 2 Comparative Example 3 Comparative Example 4 Flexural modulus 90,000 100,000 100,000 70,000 14,000 62,000 31,000 89,000 Impact strength at room temperature 15 15 15 21 10 15 4 22 Low temperature impact strength 12 12 12 18 5 9 3 13 importance 1.53 1.87 1.91 1.67 0.91 1.12 1.56 1.12 MD Shrinkage 3.1 3.1 3.1 2.8 15.8 9.0 9.0 8.8 TD shrinkage 2.6 2.6 2.6 2.4 15.8 2.0 8.8 1.9 Surface gloss 35 30 28 40 75 20 60 10

The flexural modulus (kg / cm 2) was measured at room temperature by the method of ASTM D 790 and the impact strength at room temperature (kg · cm / cm) was measured at room temperature by the method of ASTM D 256, (kg · cm / cm) was measured at -10 ° C. according to the method of ASTM D 256, and specific gravity was measured at room temperature according to the method of ASTM D 1238. The surface gloss (%, 60 ') was measured by ASTM D 523 And the MD shrinkage (%) was measured by the method of ASTM D 955 in the machine direction at room temperature. The TD shrinkage (%) was measured by the method of ASTM D 955 at room temperature in the transverse direction Respectively.

As shown in Table 2, the polyolefin resin compositions prepared in Examples 1 to 4 have higher flexural modulus, impact strength and specific gravity than the comparative examples 1 to 4, and have a low shrinkage ratio, have.

Therefore, the polyolefin resin composition can improve the strength, impact resistance and dimensional stability when manufactured into the case 10 through injection molding.

It is to be understood that the present invention is not limited to the above-described embodiment, but may be modified in various forms without departing from the spirit and scope of the present invention. It will be understood by those of ordinary skill in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined in the appended claims.

1: Heat wave control device for preventing frost 10: Case
11: vent cover 12: vent
13: Power supply terminal groove 14: Communication terminal groove
20: piping 21: connector
30: heat line 110: power supply unit
120: temperature sensing unit 121: first temperature sensing sensor
122: second temperature sensor 130: power cut-
140: standby power cutoff unit 150: display unit
151: Power indicator 152: Operation indicator
153: Light leakage indicator 154: Alarm indicator
160: control unit 161:
162: first judgment unit 163: second judgment unit
164: current detection unit 165: overcurrent suppression unit
166: Temperature adjusting unit 167: Memory unit
168: Leakage judging unit 169:
1000: Central monitoring board

Claims (7)

A hot wire provided in a pipe for supplying fluid to various kinds of mechanical equipment;
And a communication terminal groove for receiving data from / to the outside, and a communication terminal groove for receiving data from / to the outside. The lower side wall is provided with a connection pipe A case having a power cable connected to the hot wire to supply power to the hot wire;
A power supply unit mounted on a printed circuit board built in the case and supplying power supplied through the power supply terminal groove to the hot wire through the power cable;
A first temperature sensor installed at an outer periphery of the pipe to sense a temperature of the pipe;
A second temperature sensor installed on an outer surface of the case to sense an external temperature;
A power cutoff unit mounted on the printed circuit board to cut off a power supplied from the power supply unit to the hot wire through the power cable according to a detection result of the first temperature sensor;
A standby power cutoff unit mounted on the printed circuit board to cut off standby power according to a detection result of the second temperature sensor;
Wherein the controller is configured to turn off the standby power interruption unit to shut off the standby power when the external temperature sensed by the second temperature sensor is out of the first reference temperature value, When the temperature of the pipe detected by the first temperature sensor is out of the second reference temperature value, the controller turns on the power cutoff unit to supply power to the hot wire through the power cable. And
A power indicator provided on a front portion of the case for indicating whether power is supplied from the power supply to the controller, an operation indicator for indicating whether power is supplied from the controller to the hot wire, Or a leakage indicator for indicating whether or not an electric current is leaked in the heating wire control device and an alarm indicator for indicating a dangerous occurrence signal when an overload or an overheating occurs in the heating wire or heat wire control device; , &Lt; / RTI &
The control unit includes a communication unit for transmitting and receiving data to and from an external device through the communication terminal groove, a first determination unit for determining whether the external temperature sensed by the second temperature sensing sensor is out of a first reference temperature value, A second determination unit for determining whether a temperature of the pipe detected by the first temperature sensor is out of a second reference temperature value, a current detector for detecting a magnitude of a current flowing through the hot wire, An overcurrent suppressing unit that limits a current flowing through the corresponding hot wire to a reference current value per hot wire length by using a magnitude of a current flowing in the hot wire, A second reference temperature value, a reference current value per the hot line length, and a temperature adjustment program A power controller for controlling the operation of each component according to a result output from the first determination unit, the second determination unit, and the current detection unit; The control unit controls the intensity of the power supplied to the hot wire to be proportional to the temperature of the pipe sensed by the first temperature sensor by a preset temperature control program, To be less than or equal to a reference current magnitude per a predetermined line length,
The standby power cutoff unit is connected between the power cutoff unit and the control unit to cut off standby power of the control unit according to the detection result of the second temperature detection sensor,
The power indicator is connected between the power supply unit and the standby power cutoff unit to indicate whether power is supplied from the power supply unit to the control unit even when the standby power cutoff unit is turned off and the standby power is cut off ,
Wherein the heat-radiating member is a heat-radiating member.
delete delete delete delete delete A heat conduction control device for preventing frost damage according to claim 1, wherein the conduit is divided into zones to be managed, and the device numbers are assigned to the respective zones; And
A communication channel is formed using the RS-485 communication method with the heat-ray-blocking-use heat-ray control device, the respective operation state information and the heat-ray control information are received from the heat-wave-prevention heat-ray control device, A central monitoring unit for monitoring and controlling the operation of the device;
And a control unit for controlling the heating element.

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