JP4685543B2 - Electric floor heating system - Google Patents

Description

  The present invention relates to an electric floor heating system having a cord-shaped electric heater as a heat source.

  An electric floor heating system having a cord-like electric heater as a heat source is known. After placing the cord-shaped electric heater on the floor foundation, place the wooden flooring from above, or connect the wooden flooring integrally with the cord-shaped electric heater on the floor foundation. By placing it in the electric floor heating system. The cord-shaped electric heater is mainly supplied with electric power from a commercial power supply via a controller. The controller includes functions such as specifying a heating area, starting and stopping energization, setting a temperature level in a steady operation mode, and detecting an abnormality (see Patent Document 1, Patent Document 2, and the like). There has also been proposed a control device such as floor heating in which power supply control to the heater is performed by energization rate control according to the ambient temperature detected by the temperature sensor by the comparison control means (Patent Document 3, etc.) reference).

  In a conventional electric floor heating system, when a user turns on a power switch of a controller at the start of use and selects a set temperature level in a desired steady operation mode, a start-up operation mode at 100% energization rate is, for example, After continuing for about 30 minutes, the operation mode is switched to the steady operation mode at the energization rate corresponding to the selected set temperature level. The floor surface temperature becomes a set temperature level, and thereafter, the temperature is maintained. As described in Patent Document 3, in the case of controlling the energization rate according to the ambient temperature detected by the temperature sensor, the floor surface temperature can be adjusted in accordance with the change in the outside air temperature.

Japanese Unexamined Patent Publication No. 7-248122 JP-A-10-185222 JP-A-5-203168

  In the case of an electric floor heating system that uses a cord-like electric heater as a heat source and an energization rate control method as a control method for the floor surface temperature, after the floor surface temperature reaches the selected set temperature level, the temperature Maintained. However, when the set temperature level is high and the steady operation at a power supply rate of about 100% is continued, especially when the operation is performed for a long time of about 7 to 10 hours with no change in the outside air temperature, The floor surface temperature may rise to higher temperatures.

  The general floor surface temperature of floor heating is said to be around 27 ° C. to 30 ° C. at the highest. When the temperature rises as described above, the floor surface temperature is around 40 ° C., which is about 10 ° C. than the set temperature. There is a risk of high temperatures. Such a temperature environment can impair the comfort of floor heating and cause low-temperature burns due to thermal blockage. Of course, an electric floor heating system is provided with a thermostat as a means for preventing excessive temperature rise, and the safety of the system is ensured, but the operating temperature of the thermostat is normally set to about 42 to 50 ° C. However, this phenomenon cannot be avoided with a thermostat.

  The present invention has been made in view of the circumstances as described above. In an electric floor heating system that uses a cord-like electric heater as a heat source and adopts an energization rate control system as a floor surface temperature control system, the outside air Even in a case where steady operation at an energization rate of about 100% continues for a long time in an environment where there is no change in temperature, it is possible to avoid the floor surface temperature from greatly rising beyond a preset temperature level selected in advance. An object of the present invention is to provide an electric floor heating system.

  An electric floor heating system according to the present invention is an electric floor heating system including at least a cord-shaped electric heater that is a heat generation source and a controller that includes at least an energization rate control unit that controls an energization rate to the cord-shaped electric heater. The energization rate control means includes a timer means for monitoring an elapsed time after the energization of the cord-shaped electric heater is started, and energization by a preset amount when a time preset by the timer means elapses. The present invention is characterized in that it includes an energization rate reducing means for reducing the rate.

  In the electric floor heating system according to the present invention, the controller includes the above-described energization rate reducing means. When energization continues for a predetermined time after the energization is started, the energization rate is automatically reduced by a preset amount. Therefore, even when the electric floor heating system is placed in an environment where there is no change in the outside air temperature, and the steady operation at a power supply rate of about 100% continues for a long time, the floor surface temperature is initially selected. It is possible to effectively avoid exceeding the temperature level. As a result, it is possible to maintain the floor surface temperature in a certain temperature range even if continuous operation is performed for a long time. Therefore, the comfort of floor heating is not impaired, and low temperature burns due to the thermal blockage phenomenon are not caused. Further, reducing the energization rate results in avoiding unnecessary power use, resulting in a reduction in power consumption and an energy saving effect.

  Furthermore, when a cushion or the like is left on the floor heating for a long time, or when partial peeling occurs between the cord-shaped electric heater and the heat equalizing plate on which it is disposed, so-called A thermal clogging phenomenon due to forced insulation may occur and an abnormal temperature rise region may partially occur. However, by providing the above-described energization rate reducing means, the occurrence of such an abnormal temperature rise phenomenon is also avoided. be able to.

  The amount of time from the start of energization to the start of automatic energization reduction and the amount of energization reduction set in the energization reduction means depend on the floor heating usage conditions and environment. However, it is preferably set in a range in which the temperature range of the floor surface temperature after the reduction of the energization rate does not decrease compared to before the reduction of the energization rate. For example, it is practical to set the set time from the start of energization to the start of automatic reduction of the energization rate within a range of 4 to 10 hours after the input, judging from the usage mode of normal floor heating. In a time shorter than 4 hours, depending on the environment where the electric floor heating system is placed, the energization rate may be forcibly reduced when the floor surface temperature does not reach the set temperature level, This is because the floor surface temperature is lowered and the user feels uncomfortable. It is desirable that the reduction rate of energization rate is about 10 to 15% of the energization rate at the start of energization. If the value is reduced to a value larger than this, the temperature range of the floor surface temperature after the reduction of the energization rate may be lowered to the extent that the user is aware as compared to before the reduction of the energization rate.

  The energization rate reduction number may be one. In that case, after a set time (for example, 8 hours) has elapsed, the current ratio at the start of power distribution is reduced by, for example, 10% or 15%, and the steady operation is continued at a power ratio of 90% or 85%. However, if the energization rate is reduced by a large value of 10% or 15% at a time in this way, the change in the floor surface temperature temporarily increases, which may cause discomfort to the user.

  In order to avoid this, it is preferable that the timer means in the energization rate control means can set the same or different interval set times continuously in multiple stages over time. In this case, for example, when 4 hours have elapsed after the start of energization, 5% of the energization rate at the start of energization is reduced, and after 4 hours have elapsed (after 8 hours have elapsed since the start of energization), Set to reduce by 5%. By reducing the energization rate step by step in this way, the change in floor surface temperature can be reduced, and the user's discomfort is eliminated.

  In the electric floor heating system according to the present invention, the controller may further include means for selecting an energization rate at the start of energization. Specifically, for example, for a cord-shaped electric heater having the same rated output, the operation is started with the energization rate at the start of energization as 100% energization rate, or lower than that, for example, 75% energization rate or 50% energization rate To be able to select whether to start driving. In any case, the energization rate is reduced by a preset amount from the energization rate at the start of energization after a predetermined set time.

  This means for selecting the energization rate at the start of energization is extremely effective when the same electric floor heating system is installed in different environments, for example, in regions with different temperatures such as Hokkaido and Tokyo. For example, when this selection means is installed as a dip switch at a position in the controller that is not easily accessible by the user in normal use, and the electric floor heating system is installed in the Hokkaido area, the contractor is 100% energized. Select the rate dip switch and install. On the other hand, when construction is performed in the Tokyo area, a contractor selects, for example, a dip switch with a 75% energization rate and performs construction.

  In cold districts such as Hokkaido, when the user selects a high set temperature, the steady operation mode with an energization rate of 100% at the start of energization proceeds, and the comfortable floor surface between 27 ° C and 30 ° C as described above A temperature is obtained. On the other hand, in a relatively warm district such as Tokyo, a cord-like electric heater with the same rated output is used, and even when the energization rate at the start of energization is set to 75%, the floor surface temperature is 27 ° C. in the steady operation mode. It becomes a comfortable temperature of about ~ 30 ° C. Therefore, even in an electric floor heating system constructed by selecting a low energization rate at the start of energization, the floor surface temperature can reach up to about 40 ° C when the operation is continued for a long time. It is effective to adopt the energization rate reducing means according to the invention.

  The controller may be provided with an energization rate selection means for selecting an energization rate corresponding to the set temperature (floor surface temperature) in the steady operation mode. In this case, when the user turns on the power switch of the controller and selects the desired set temperature level, after a certain time has elapsed, the user enters a steady operation mode at a current rate corresponding to the set temperature level, and the floor surface temperature is the set temperature. Maintained in a belt. When the selected set temperature level is as low as about 25 ° C. or less, the energization rate during steady operation is low, and even if the state continues for a long time, the floor surface gives the above discomfort There is no increase in temperature. However, when a high set temperature level is selected, the operation continues at a current rate of 100% or near 100% in the steady operation mode, so that a temperature rise that reaches about 40 ° C. may occur. Therefore, even when using a controller having an energization rate selection means for selecting an energization rate corresponding to a desired set temperature level in the steady operation mode, it is extremely difficult to provide the above-described energization rate reduction means according to the present invention. It becomes effective.

  In addition, there is no restriction | limiting in particular in the whole structure of the electric type floor heating system in this invention, After arrange | positioning arbitrary structures known conventionally, for example, a cord-shaped electric heater on a floor ground, it is woody from the top In the form constructed by placing the floor material on the floor, or in the form constructed by placing it on the floor foundation while electrically connecting the wooden floor material in which the cord-like electric heater is integrated. Stuff, etc. all included.

  According to the present invention, in an electric floor heating system using a cord-like electric heater as a heat source and adopting an energization rate control method as a floor surface temperature control method, energization for a long time in an environment where the outside air temperature does not change. Even if it continues, it can be surely avoided that the floor surface temperature rises above the set temperature range (level) set at the beginning, giving the user discomfort due to excessive temperature rise, It is possible to reliably avoid the occurrence of low-temperature burns due to the blocking phenomenon. In addition, power consumption can be reduced, and energy saving operation is possible.

  Hereinafter, the present invention will be described with reference to embodiments. FIG. 1 is a schematic diagram showing an electric floor heating system according to the present invention, and FIG. 2 is a block diagram showing an overall control system.

  In FIG. 1, a cord-like electric heater 11 as a heat source is disposed on a floor base 10, and a large number of wood-based flooring 12 having concave grooves for accommodating the cord-like electric heater 11 formed on the back surface thereof. It is laid to create an electric floor heating floor. Although not shown, an electric floor heating floor may be made by placing a wooden floor material integrally incorporating a cord-shaped electric heater on a floor base while being electrically connected. In either case, the cord-shaped electric heater 11 is supplied with commercial power from the outside via the wiring 13, and a controller 20 is attached in the middle of the wiring.

  FIG. 2 is a block diagram showing a control system of the entire electric floor heating system. The electric floor heating system according to the present invention is a cord-shaped electric heater driven by the controller 20 and an energization rate controlled by the controller 20. 11 and. The controller 20 includes a control unit 30, a timer 31 and a DIP switch 32 are connected to the control unit 30, and an operation panel 40, a storage unit 50, and a drive circuit 60 are further connected.

  The operation panel 40 includes an ON / OFF switch 41 for the entire system, temperature level selection switches 42a to 42c for the user to select a set temperature level L during steady operation, a selected set temperature level L, time, and the like. A display tee spray 43 and the like are provided. In this example, as shown in FIG. 3, the output level at the time of steady operation is divided into three stages of three stages st1 to st3. When the selection switch 42a is selected, the maximum level LH (for example, energization at the start of energization) A command to operate at a rate P of 100% energization rate L) is sent to the control unit 30, and when the selection switch 42b is selected, at an intermediate level LM (for example, 70% energization rate of the energization rate P at the start of energization). A command to drive is sent to the control unit 30, and when the selection switch 42c is selected, a command to drive at the minimum level LL (for example, 40% of the power supply rate P at the start of power supply) is issued to the control unit 30. Sent to. Note that the temperature level selection switches 42a to 42c may have a form in which values continuously change like a slider switch.

  The storage unit 50 includes a power supply rate table T, which will be described later.

  The drive circuit 60 is a circuit for supplying power from the power supply line 13 to the heater 11, and incorporates a switching circuit 61 as an example of means for performing energization rate control. The switching circuit 61 includes one or two or more relays, and controls the energization rate P to the heater 11 by changing the opening and closing of each relay by a command from the control unit 30, and is known per se. Is.

  As shown in FIG. 3, the control unit 30 sends a signal having a relay opening / closing cycle T to the switching circuit 61. This signal makes the switching circuit 61 conductive in the high level period t1, and makes the switching circuit 61 nonconductive in the low level period t2. The set energization rate P can be obtained by controlling the ratio of t1 / t2 with an appropriate circuit.

  In the controller 20, when the user turns on the ON-OFF switch 41 at the start of use and selects a desired set temperature level Li (any of LH, LM, LL) by the temperature level selection switches 42a to 42c, When the start-up operation mode at the% energization rate is started and the time set for the timer 31 is about 30 minutes, for example, the operation mode is switched to the steady operation mode, and the control unit 30 is in the steady operation mode selected by the user. A signal of the high level period t 1 corresponding to the set temperature level Li is sent to the switching circuit 51. This operation mode and the system configuration therefor are known in the art and will not be described in detail.

  The controller 20 according to the present invention is conventionally known in that it further includes an energization rate reducing means for automatically reducing the energization rate by a preset amount q when a time t preset by the timer 31 has elapsed. Different from the controller. Hereinafter, the difference will be mainly described.

  That is, in the storage unit 50 of the controller 20 according to the present invention, the energization rate Pmax to the cord-shaped electric heater 11 at the start of energization and the energization rate Pi after a predetermined time ti has elapsed (for example, after 4 hours and 8 hours have elapsed) are determined. The required power supply rate table T is stored. In this example, the power supply rate table T is composed of three tables T1, T2, and T3. As shown in FIG. 5, the power supply rate table T1 has an energization rate Pmax when the power is turned on: 100%, and the time since the power is turned on. Energization rate P1 after elapse of t1 (after 4 hours): 95% (−5% reduction), energization rate P2 after elapse of time t2 (> t1) after elapse of power (after 8 hours): 90% (further − 5% reduction).

  In addition, the power supply rate table T2 indicates that the power supply rate Pmax when the power is turned on is 75%, the power supply rate P1 is 70% (after -5% has elapsed) after the time t1 has elapsed since the power is turned on, and the time since the power is turned on. The energization rate P2 after elapse of t2 (> t1) (after 8 hours) is 65% (further reduced by -5%).

  Further, the power supply rate table T3 indicates that the power supply rate Pmax when the power is turned on is 60%, the power supply rate P1 is 55% after the time t1 has elapsed since the power is turned on (after 4 hours have elapsed), and the time since the power is turned on. The energization rate P2 after elapse of t2 (> t1) (after 8 hours) is 50% (further reduced by -5%).

  Here, the time t set in advance by the timer 31 corresponds to the elapsed times t1 and t2, and the preset amount q corresponds to a reduction amount (−5%) at each stage of the energization rate. .

  In the controller 20, any one of the three tables T 1, T 2, T 3 is selected by operating the DIP switch 32, and information on the selected power supply rate table Ti is taken into the control unit 30. As described above, the power supply rate table T to be stored is not limited to three.

  When constructing the electric floor heating system according to the present invention, the contractor operates the dip switch 32 to select the power supply rate table Ti optimum for the construction site from any one of the tables T1 to T3. As an example, since the construction site is a cold district, an example of the operation of the electric floor heating system will be described with reference to FIG. 6 assuming that the table T1 is selected.

  The user turns on the ON-OFF switch 41 of the operation panel 40 (step 301). The control unit 30 reads the dip switch 32 selected in advance, and takes in the information of the table T1 (step 302). The user selects the set temperature level Li during steady operation from any of the temperature level selection switches 42a to 42c (step 303). Here, it is assumed that the selection switch 42a is selected and the 100% energization rate LH of the energization rate P at the start of energization is selected as the energization rate during steady operation.

  The timer 31 is activated, and a start-up operation with an energization rate of 100% is started (step 304). After a preset time (usually about 30 minutes) has elapsed, the operation mode is switched to the steady operation mode (step 305), and the control unit 30 supplies the switching circuit 61 of the drive circuit 60 with the energization rate during the steady operation (in this example, at startup A signal having a length corresponding to 100% of the energization rate P) is sent, and the drive circuit 60 continues to drive the heater 11 at the 100% energization rate LH (step 306).

  The timer 31 monitors whether or not the time t1 from the start of energization has elapsed (step 307). When the time t1 (for example, 4 hours) elapses, the comparison circuit in the control unit 30 compares the energization rate P1 (95%) after the elapse of the time t1 set in the table T1 with the current energization rate Ps%. (Step 308). When the current energization rate Ps is equal to or lower than the energization rate P1, the operation is continued as it is (step 309). When the current energization rate Ps is higher than the energization rate P1, the control unit 30 causes the switching circuit 61 of the drive circuit 60 in the high-level period t1 so that the energization rate corresponds to the energization rate P1 (95%). A change signal is transmitted (step 310). As a result, the system continues to operate at an energization rate of 95%.

  It is monitored whether time t2 (for example, 8 hours from the start of energization) has elapsed (step 311). When the time has elapsed, the comparison circuit in the control unit 30 compares the energization rate P2 (90%) after the elapse of time t2 set in the table T1 with the current energization rate Ps% (step 312). When the current energization rate Ps is equal to or lower than the energization rate P2, the operation is continued as it is (step 313). When the current energization rate Ps is higher than the energization rate P2, the control unit 30 causes the switching circuit 61 of the drive circuit 60 to switch to the energization rate corresponding to the energization rate P2 (90%) during the high level period t1. A change signal is transmitted (step 314). As a result, the system continues steady operation at an energization rate of 90%.

  As described above, in the electric floor heating system according to the present invention, when the steady operation state continues for a long time, the energization rate is automatically reduced by a predetermined amount. It is possible to effectively avoid the phenomenon that the floor surface temperature is likely to be higher than the set temperature level, for example, by about 10 ° C., which tends to occur when the steady operation is continued with the current rate maintained. Therefore, the safety of the system can be improved, and the energy saving of operation is brought about.

  In the above description, the case where the user sets the set temperature level at the time of steady operation as the maximum value LH (energization rate 100%) has been described as an example. However, for example, when the set temperature level LM or LL described above is selected In the normal operation, the energization rate at the start of energization is 70% or 40%, respectively. In this case, the determination in step 308 and step 311 is always no, that is, the energization at that time The rate Ps is lower than the energization rate P1 (95%) or the energization rate P2 (90%), and the energization rate automatic reduction function of the present invention does not function. However, when the user selects LM or LL, as shown in FIG. 7, the floor temperature level during steady operation is as low as about 25 ° C. or about 18 ° C., and the operation state continues for a long time. However, the phenomenon that the floor surface temperature becomes as high as about 40 ° C. does not occur, and there is no particular problem.

  When constructing the electric floor heating system according to the present invention in a relatively warm area, the contractor operates the dip switch 32 to select the table T2 or the table T3 shown in FIG. In that case, when the temperature level selection switch 42a is selected, at the maximum level LH, the energization rate P (75% (in the case of Table 2) and 60% (in the case of Table 3) at the start of energization is set to 100. The operation at the 100% energization rate, that is, 75% × 1 = 75% energization rate, or 60% × 1 = 60% energization rate becomes the energization rate in the steady operation mode Temperature level selection switch 42b (intermediate level LM ) In the steady operation mode, operation at 75% × 0.7 = 53% energization rate (in the case of Table 2) or 60% × 0.7 = 42% energization rate (in the case of Table 3) Furthermore, when the temperature level selection switch 42c (low level LL) is selected, in the steady operation mode, 75% × 0.4 = 30% energization rate, or 60% × 0.4 = 24% energization rate. The operation.

  Even in the above case, as described above, in operation at the maximum level LH (during steady operation, operation at 100% of the energization rate P at the start of energization), the floor surface up to about 40 ° C. due to continuous operation for a long time. Since an increase in temperature can occur, the automatic energization rate reduction method according to the present invention is still effective.

  In the above description, the dip switch 32 is exemplified as the selection means for the power supply rate tables T1 to T3. However, the dip switch 32 is merely an example, and any means can be used to select one of the plurality of current supply rate tables. Any selection means can be used. In addition, although the switching circuit 61 using a relay is shown as a circuit for controlling the energization rate, this is also an example, and any conventionally known energization rate control means can be used.

Schematic which shows an example of the electric floor heating system by this invention. The block diagram which shows the control system of the whole electric floor heating system. The table which shows the relationship between the energization rate at the time of an energization start, and the output level at the time of steady operation. The figure explaining the waveform which shows the electricity supply rate control in a system. The figure for demonstrating a power supply rate table. Flow chart of control. The graph which shows an example of the relationship between the floor surface temperature and time by an electricity supply rate control system.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 ... Floor base | substrate, 11 ... Code-like electric heater, 12 ... Wood type flooring, 13 ... Wiring, 20 ... Controller, 30 ... Control part, 31 ... Timer, 32 ... Dip switch, 40 ... Control panel, 42a-42b ... Setting temperature level selection switch, 50 ... storage unit, 60 ... drive circuit, 61 ... switching circuit, T ... energization rate table

Claims (3)

An electric floor heating system including at least a cord-like electric heater that is a heat source and a controller that includes at least an energization rate control unit that controls an energization rate to the cord-like electric heater,
The controller further includes means for selecting an energization rate at the start of energization, and the energization rate control means is preset by the timer means for monitoring the elapsed time after the energization of the cord-shaped electric heater is started, and the timer means. An electric floor heating system comprising: an energization rate reducing means for reducing the energization rate by a preset amount when a predetermined time has elapsed.   2. The electric floor heating system according to claim 1, wherein the timer means in the energization rate control means can set the same or different interval set times continuously in multiple stages over time. The electric floor heating system according to claim 1 or 2 , wherein the controller is provided with an energization rate selection means for selecting an energization rate corresponding to a set temperature in the steady operation mode.

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