KR101482158B1 - Cool and Hot water Circulation Conditioner For Mattress, Panel - Google Patents

Abstract

The present invention relates to a cool and hot water circulation conditioner for a mattress. More specifically, the cool and hot water circulation conditioner for a mattress circulates and supplies hot water to the mattress by operating a heater in case of the heating state according to a fixed temperature, and refrigerates water circulating by heat exchanging using a refrigeration cycle of the heat pump in case of the cooling state. The present invention circulates and supplies the cool water to the mattress in order to maximize cooling efficiency of the mattress and to save energy required for cooling. The cool and hot water circulation conditioner is configured to cool water circulating by the heat exchanging using a refrigeration cycle of a cooling unit which is mounted therein, thereby resolving a problem that cooling efficiency is significantly deceased.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a hot water circulation system for a mat,

More particularly, the present invention relates to a hot and cold water supply device for a mat, and more particularly, to a hot and cold water supply device for a mat, in which a heater is operated in a heating state to circulate hot water to a mat, The present invention relates to a circulating hot and cold water supply device for a mat, which circulates water to be circulated through heat exchange using a circulating water to circulate the cooling water to the mat, thereby maximizing the cooling efficiency of the mat and saving energy required for cooling.

Generally, the mat for cooling and heating is to circulate hot and cold water supplied from the outside to provide cold or warm air to the user. This is done by heating the water using a heater installed inside the water tank, Or water is cooled by using a thermoelectric element to supply cold water, and water is circulated along the piping provided in a zigzag form inside the mat to perform cooling and heating.

For example, Japanese Patent Application Laid-Open Publication No. 10-2014-0013336 discloses a prior art that is a background of the present invention. And a heat exchange unit connected to the fluid passage and supplying a cool air or a warm air, wherein the heat exchange unit comprises: an air supply unit for sucking outside air; And a thermoelectric element unit including a thermoelectric element and a heat sink for converting the air sucked from the air supply unit into a cold wind or a hot wind. And a controller for controlling the air supply unit and the thermoelectric element unit.

As another example, Korean Patent Laid-Open Publication No. 10-2013-0036026 discloses a conventional technology as a background of the present invention. This is because a bent pipe repeated in a zigzag form is embedded in a cold heat exchanger channel A metal plate to be formed; A heater member coupled to one side of the metal plate and configured to provide heat; And a cooling member coupled to the other side of the metal plate to provide cold heat is installed in the cold / hot water boiler for the hot / hot water mat to selectively provide cold or hot water.

However, in the past, the thermoelectric element is proportional to the heat absorbing amount and the heat radiation amount in a certain range, that is, when the heat radiation temperature is high, the endothermic temperature also has to be high. Therefore, it is difficult to efficiently supply water by effectively cooling the water only by the heat sink or the blower fan there was.

In addition, conventionally, in order to cool or heat the outside air by using the thermoelectric element, a thermoelectric element having a considerable capacity is connected to the thermoelectric element, and the thermoelectric element is continuously operated together with the heater, In addition to the increase in cost, this also has a problem in that it is difficult for the user to cool the water at a desired low temperature and the operating life is lowered by continuous operation.

SUMMARY OF THE INVENTION The present invention has been made to solve the above problems, and it is an object of the present invention to provide a cold and hot water circulating and supplying device which is configured to separately cool water circulated through heat exchange using a refrigeration cycle of a cooling unit provided therein, And to solve the conventional problem of falling down.

Further, in the present invention, the cold and hot water circulation supply device is provided with a heater for heating and a cooling unit for cooling, respectively, and the temperature of water is measured using a temperature sensor, and the heater or the cooling It is another object of the present invention to solve the conventional problem that the user can not cool water to a desired temperature in addition to an increase in maintenance cost due to an increase in electric consumption through the selective operation of any one of the units.

According to an aspect of the present invention,

The present invention relates to a hot and cold water circulating device for a mat, which supplies cold water or hot water to a mat to perform cooling and heating, and is equipped with a water storage space therein, and supplies water stored using a pump provided at one side of the water storage space A tank; When the pump is connected and the water is supplied, the diaphragm installed inside the diaphragm blocks the valve seat according to the pressure of the pump, thereby discharging the water while preventing the water from flowing back into the water storage space A valve; A heater connected to the water discharge side of the valve and serving as a conduit for water to operate only when the set temperature is reached, thereby heating the water flowing into the conduit to supply hot water; The water supplied to the evaporator provided inside is connected to the heater so that the water supplied to the evaporator provided therein is discharged and at the set temperature, the water is cooled only through heat exchange using the refrigeration cycle A cooling unit for providing cold water; Circulating / circulating the water in the circulation pipe of the mat by using a structure in which water is supplied to the cooling unit and the recovery pipe is connected to the tank, respectively, while being connected to the cooling unit and the tank, And a water supply port for returning the water to the water supply port.

According to the present invention, the cooling efficiency of the water supplied to the mat is remarkably improved by the operation of the cooling unit.

Also, according to the structure in which either the heater or the cooling unit is operated according to the set temperature, the amount of electricity consumed for cooling or heating is reduced to save maintenance cost, and the available temperature of the mat There is another effect that can be arbitrarily adjusted.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a schematic view of a circulation supply device for hot and cold water for a mat according to an embodiment of the present invention; FIG.
BACKGROUND OF THE INVENTION 1. Field of the Invention [0001]
FIG. 3 is a schematic view of a cold / hot water circulating supply device for a mat according to another embodiment; FIG.
4 is a schematic view of a cold / hot water circulating supply device for a mat according to still another embodiment.

The cold and hot water circulating supply device for a mat according to the present invention will be described in detail with reference to the accompanying drawings.

In the following description of the exemplary embodiments of the present invention, a detailed description of components that are widely known and used in the art to which the present invention belongs is omitted, and unnecessary explanations thereof are omitted. It is to communicate the point more clearly.

1 and 2 are diagrams for explaining a circulating hot and cold water supply device for a mat according to an embodiment of the present invention.

A circulating hot and cold water supply device for a mat according to the present invention will now be described with reference to the accompanying drawings. A tank 110 having a water storage space 112 and supplying water stored using a pump 111 provided at one side of the water storage space 112; The diaphragm 122 installed in the tank 110 is connected to the pump 111 and supplies water to the diaphragm 122 to block the valve seat 125 according to the pressure of the pump 111 A valve (120) for discharging water while preventing water from flowing back into the water storage space (112); A heater (130) connected to the water discharge side of the valve (120) and serving as a conduit for water to operate only when the set temperature is reached, thereby heating water flowing in the conduit to provide hot water; The evaporator 210 is connected to the heater 130 to supply water to the evaporator 210. Water is supplied to the evaporator 210 through the evaporator 210. The evaporator 210 is operated only when the set temperature is reached, A cooling unit 200 for cooling the water passing through the cooling unit 210 to provide cold water; The cooling unit 200 is connected to a water outlet pipe 310 and the tank 110 is connected to a recovery pipe 200. The water outlet pipe 310 is connected to the cooling unit 200 and the tank 110, And a water supply port 300 for supplying / circulating / returning water to / from the circulation pipe 12 of the mat 10 by using a structure in which the water circulation pipe 320 is connected to the water supply port 300.

The mat (10) to which the present invention is applied will be schematically described before the cold / hot water circulation supply device (1) of the present invention is explained. The mat (10) Cold water and hot water are supplied to perform cooling and heating, and middle temperature, that is, lukewarm water can be supplied thereto. The structure includes a mat plate 11; And a circulation pipe 12 circulating the water while feeding water into the mat plate 11 by zigzag.

The cold / hot water circulation supply device (1) of the present invention has a case (2) in which each component except the mat (10) is accommodated and installed.

At this time, the case 2 is an outer shape of the cold / hot water circulating and supplying device 1, and its shape and size can be variously modified according to the place of installation. The case 2 is made of a synthetic resin or metal It is made of material.

Hereinafter, the constitution of each part of the present invention will be described in detail.

First, the tank 110 is provided with a water storage space 112 therein, and the water stored by using the pump 111 provided at one side of the water storage space 112 is supplied to the cooling unit including the heater 130, (200).

At this time, the tank 110 is formed in a hollow shape, and a water storage space 112 is provided therein to fill water into the water storage space 112, and water supplied and supplied from the water is supplied to the heater 130, The unit 200, and the mat 10 to return.

At this time, the tank 110 can be variously deformed in accordance with the shape and the size of the case 2 of the cold / hot water circulation supply apparatus 1, and the pump 110 and the pump 111 are installed outside the tank 110 The heater 130 is fixedly installed.

The valve 120 is installed inside the tank 110. When the pump 111 is connected and water is supplied, the diaphragm 122 provided inside the valve 110, according to the pressure of the pump 111, And discharges the water to the heater 130, which will be described later, while preventing water from flowing back into the water storage space 112 by the function of cutting off the sheet 125.

At this time, the valve 120 is opened at all times when the pump 111 is not operated, so that the water contained in the water storage space 112 of the tank 110 is naturally introduced into the heater 130 side .

The valve 120 defines a space defined by the water storage space 112 inside the tank 110 and a valve seat 125 which is a through hole connected to the water storage space 112 at one side And further includes a blocking wall 121 provided therein.

At this time, the blocking wall 121 is formed integrally in the form of a partition wall at the inner side wall of the tank 110, so that a space is formed separately from the water storage space 112, and a valve seat (125) is provided to open and close the partitioned space as necessary.

At this time, the valve seat 125 is formed with a fastening hole 121a for fastening the diaphragm 122, which will be described later, and a through hole through which the water flows around the fastening hole 121a And the diaphragm 122 covers the portion protruded by the rim of the through hole, thereby opening and closing the flow of the water.

The valve 120 is positioned inside the blocking wall 121 so that a guide rod 122a provided at one side of the valve 120 is inserted into the center of the valve seat 125 and is transferred before and after the valve is inserted. And a diaphragm 122 having a structure in which a plate 122b formed integrally with the guide rod 122a is formed as a circular plate to open or close a through hole of the valve seat 125. [

The diaphragm 122 is integrally formed in a plate shape at one end of the guide rod 122a and a guide rod 122a which is inserted into the central coupling hole 121a of the valve seat 125, And a valve plate 122b for opening or closing the through hole of the valve seat 125. [

At this time, a rubber plate for securing airtightness may be further provided on one side of the plate 122b and on the side facing the valve seat 125.

The valve 120 further includes an elastic member 123 interposed between the diaphragm 122 and the blocking wall 121 to elastically support the diaphragm 122 so that the diaphragm 122 is always open.

At this time, the elastic member 123 is supported on the inner surface of the valve plate 122b of the diaphragm 122 at one end in a general spring shape, and the other end is positioned at a position adjacent to the valve seat 125 inside the blocking wall 121 .

At this time, the elastic member 123 may be composed of a spring, urethane, rubber, or the like having an elastic force.

Therefore, when water is supplied by the operation of the pump 111 by the opening and closing action of the valve 120 of the present invention, the diaphragm 122 is closed on the valve seat 125 by the water supply pressure of the pump 111 Thereby preventing the water from flowing back to the tank 110,

When the pump 111 is not operated, the diaphragm 122 supported by the elastic member 123 is opened and the water returning from the valve seat 125 is naturally supplied to the heater 130 via the tank 110 Thereby preventing the tank 110 from overflowing with water.

The heater 130 is connected to the water discharge side of the valve 120 to serve as a water channel, and operates only when the set temperature is reached, thereby heating the water flowing into the pipe to provide hot water.

At this time, the heater 130 is formed in the form of a hollow metal tube to allow water to flow therein, and a portion where heat is generated is wrapped around the tube so that the flowing water can be heated.

The cooling unit 200 is connected to the heater 130 so that water is supplied to the evaporator 210 to discharge the water supplied to the evaporator 210 provided therein and at the same time, To cool the water passing through the evaporator (210) through heat exchange using a refrigeration cycle to provide cold water.

At this time, the cooling unit 200 is installed in the case 2 of the cold / hot water supply device in a size and shape to be described later, such as an evaporator 210, a compressor 220, a condenser 230, The valve 240 is arranged.

The cooling unit 200 is connected to the heater 130 through a drain pipe 310 and a drain pipe 310. The drain pipe 310 is connected to a water pipe The evaporator 210 further includes a water evaporator 210 for allowing the refrigerant to flow into the inner pipe 211 and performing heat exchange to absorb the heat of the flowing water when the low temperature and low pressure saturated steam refrigerant is supplied.

At this time, the evaporator 210 has a structure in which the outer tube 212 and the inner tube 211, which are made of a double tube, are wound in a ring shape. The structure is a structure in which the evaporator 210 is heat- The inlet 212 and the outlet 214 are provided at both ends of the outer tube 212 to allow water to flow in the evaporator 210.

At this time, the inlet portion 213 is connected to the heater 130 to supply water, and the outlet portion 214 is connected to a water outlet pipe 310 to be described later to discharge water.

At this time, the inner tube 211 is inserted into the outer tube 212 so as to have the same center as the outer tube 212 in a state of being manufactured with a smaller diameter than the outer tube 212, And the outlet side of the refrigerant is connected to the compressor 220 and the expansion valve 240, which will be described later, as the refrigerant passes through the side adjacent to the discharge part 214, thereby enabling heat exchange using the refrigerant.

When the low-pressure gaseous refrigerant is supplied in a state where it is connected to the refrigerant discharge side of the evaporator 210, the cooling unit 200 is supplied to the condenser 230 while being compressed by the high-temperature and high- And a compressor (220).

At this time, the compressor 220 sucks the refrigerant, compresses the refrigerant, and discharges the refrigerant into the high-temperature, high-pressure gas state. Preferably, the compressor 220 comprises a scroll compressor.

At this time, the compressor 220 is connected to the side where the inner pipe 211 of the evaporator 210 discharges the refrigerant.

When the high-temperature and high-pressure gas refrigerant is supplied to the compressor 220, the cooling unit 200 liquefies the high-temperature and high-pressure gas refrigerant by a heat dissipation function and then supplies the condensed refrigerant to the expansion valve 240 230).

At this time, the condenser 230 includes a plurality of tubes forming a predetermined flow path by connecting the inlet header and the discharge header, the inlet / outlet header, and connecting the inlet and outlet headers, and a plurality of heat transfer fins .

At this time, the inlet side of the condenser 230 is connected to the compressor 220 to supply high-temperature, high-pressure gas refrigerant. The discharge side of the condenser 230 is connected to an expansion valve 240, Thereby causing the liquid refrigerant to be supplied.

When external air flows into the condenser 230, the condenser 230 passes between the heat transfer fins between the tubes. In this process, the high-temperature, high-pressure The gas refrigerant of high temperature and high pressure is supplied to the expansion valve 240 in a liquefied state by a heat radiating action of heat exchange with the air to be blown.

In addition, the cooling unit 200 is connected to the condenser 230, and when the liquefied refrigerant is supplied, the refrigerant is reduced to a pressure capable of causing evaporation by the throttling action to convert the refrigerant into a low-temperature and low- And an expansion valve (240) for circulating the saturated vapor refrigerant to the evaporator (210).

In this case, the expansion valve 240 is a device for facilitating the heat absorbing action by evaporation of the refrigerant. The expansion valve 240 compresses the liquefied refrigerant supplied from the condenser 230 to a pressure capable of causing evaporation The refrigerant is lowered to a proper temperature at which the refrigerant can be absorbed into the saturated steam state.

At this time, the expansion valve 240 selectively applies any one of an electric expansion valve (EEV), a thermostatic expansion valve (TEV), and an automatic expansion valve (AXV) Can be used.

Therefore, the circulating water is separately cooled through the heat exchange using the refrigeration cycle of the cooling unit 200, thereby improving the cooling efficiency of the water supplied to the mat 10 through the cooling.

The water supply port 300 is detachably attached to the mat 10 while being connected to the cooling unit 200 and the tank 110. The cooling unit 200 is provided with a water outlet pipe 310, Circulating / returning the water to the circulation pipe 12 of the mat 10 by using a structure in which the recovery pipe 320 is connected to the tank 110.

At this time, the water supply port 300 connects the hot and cold water circulation supply device 1 of the present invention to the mat 10, and its connection structure is applied to a detachment method using a socket, It makes easy maintenance.

The other end of the water supply port 300 is connected to the discharge port 214 of the evaporator 210. The other end of the water supply port 300 is connected to the water discharge port 214 of the evaporator 210, And a recovery pipe 320 for detaching the other end of the mat 10 from the mat 10 while one end thereof is connected to the tank 110 and returning water circulated through the mat 10 to the tank 110 do.

At this time, the water outlet pipe 310 and the return pipe 320 are formed in a tube shape, and a socket (not shown) for detachment may be provided at a portion connected to the mat 10.

The water supply port 300 measures the temperature of the water returning to the tank 110 by the recovery pipe 320 and determines the temperature of water returning to the tank 110 from any one of the heater 130 and the cooling unit 200 And a temperature sensor 321 for activating the temperature sensor 321.

At this time, the temperature sensor 321 is coupled to the inside of the recovery pipe 320 to directly measure the temperature of the water flowing into the recovery pipe 320, (Not shown) for controlling the cold / hot water circulation supply device 1 of the present invention, and transmits the measured temperature value.

In addition, the cold / hot water circulating supply device 1 of the present invention operates according to the temperature set by the user using the control unit, and when the set temperature is set to 30 to 50 degrees, The heater 130 is operated. When the set temperature is in the range of 15 to 29 degrees, the cooling unit 200 is operated when the temperature is equal to or higher than the temperature measured by the temperature sensor 321 Mechanism.

Therefore, as described above, the cold and hot water circulating and supplying apparatus 1 uses the temperature sensor 321 to measure the temperature of the water in the state of having the heater 130 for heating and the cooling unit 200 for cooling And the heater 130 or the cooling unit 200 is selectively operated based on the measured value. Accordingly, the amount of electricity consumed for cooling or heating is reduced, thereby saving maintenance cost, The user can arbitrarily adjust the available temperature of the mat 10 according to the temperature desired by the user.

3 is a schematic view of a circulating hot / cold water supply device for a mat according to another embodiment of the present invention.

3, the water supply port 300 is further provided with a solenoid valve 311 for opening and closing the water flow path to the water discharge pipe 310, and the circulation pipe 12 of the mat 10, And the water pipe 310 and the return pipe 320 are installed in correspondence with the number of the water pipe 310 installed.

At this time, according to the opening and closing operation of the solenoid valve 311, water can be individually supplied to the circulation pipe 12, which is installed in a plurality of mats 10, to provide individual cooling and heating functions.

The water supply port 300 further includes a plurality of rear end heaters 130a in proportion to the number of the water pipes 310 when the water pipe 310 and the return pipe 320 are installed,

The rear end heater 130a operates only when the set temperature is reached, and has a structure for individually supplying hot water to the circulation pipe 12, which is installed in a plurality of mat 10 on the basis of the function of heating the water flowing into the pipe .

The rear end heater 130a has the same structure as that of the heater 130 and positions the heater 130 provided between the evaporator 210 and the tank 110 according to the user's selection, Or a rear heater 130a having the same structure as that of the heater 130 is additionally provided.

This is a structure in which a plurality of circulation pipes 12 are provided in the mat 10 so that one of the circulation pipes 12 is to be heated and the other is to be cooled.

Accordingly, when the hot water and the cold water are simultaneously supplied to the mat 10, the heater 130 for heating and the cooling unit 200 for cooling are operated at the same time, and the water heated by the heater 130 is returned to the cooling unit 200, so that the hot water can not be supplied smoothly, so that the hot water is heated again by using the rear heater 130a.

The cooling unit 200 further includes a water receiving member 250 for storing condensed water that is inevitably generated in the evaporator 210 during the refrigeration cycle process and then spraying the condensed water on the surface of the condenser 230 to further activate the heat radiating function Be provided

At this time, in order to store water at the lower part of the evaporator 210, the water-receiving unit 250 allows the water to flow to the condenser 230 by a water pipe in the form of a plate, And the water flowing through the water receiving member 250 can be sprayed to the condenser 230.

Accordingly, since the heat radiation effect is more efficiently performed by the evaporation heat generated when the condensed water sprayed to the condenser 230 evaporates, the increase of the cooling effect through the condensation is obvious, and the condensed water by the condenser 230 The number of revolutions of the blowing fan, which is inevitably provided in the first to third embodiments, can be reduced to reduce noise.

In addition, the functions of the dehumidifier and the local air conditioner can be further realized through the structure of the water receiving member 250 provided in the cooling unit 200 and the proper arrangement structure thereof. In this case, Respectively.

Meanwhile, FIG. 4 is a schematic view of a cold / hot water circulating supply device for a mat according to another embodiment of the present invention.

4, the cooling unit 200 is connected to the evaporator 210 and the compressor 220, and the compressor 220 and the condenser 230 so as to change the direction of the circulating refrigerant, And a four-way valve 260 for switching the heating.

In this case, the refrigerant passing through the evaporator 210 is cooled by the open / close operation of the four-way valve 260, so that the compressor 220 ), The condenser 220, and the evaporator 210 in this order, and in the case of heating, the four-way valve 260 can be circulated in the reverse order by the opening and closing operation of the four-

As described above. While the invention has been shown and described with reference to certain preferred embodiments thereof, it will be understood by those skilled 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 by the appended claims. It will be understood by those skilled in the art that various changes, modifications, and alterations can be made by those skilled in the art.

The present invention relates to a hot water circulation system and a hot water circulation system that includes a water tank and a water tank, A water pipe. 320;

Claims (5)

The present invention relates to a hot and cold water circulating apparatus for a mat, which supplies cold water or hot water to a mat (10)
A tank 110 having a water storage space 112 therein and supplying water stored using a pump 111 provided at one side of the water storage space 112;
The diaphragm 122 installed in the tank 110 is connected to the pump 111 and supplies water to the diaphragm 122 to block the valve seat 125 according to the pressure of the pump 111 A valve (120) for discharging water while preventing water from flowing back into the water storage space (112);
A heater (130) connected to the water discharge side of the valve (120) and serving as a conduit for water to operate only when the set temperature is reached, thereby heating water flowing in the conduit to provide hot water;
The evaporator 210 is connected to the heater 130 to supply water to the evaporator 210. Water is supplied to the evaporator 210 through the evaporator 210. The evaporator 210 is operated only when the set temperature is reached, A cooling unit 200 for cooling the water passing through the cooling unit 210 to provide cold water;
The cooling unit 200 is connected to a water outlet pipe 310 and the tank 110 is connected to a recovery pipe 200. The water outlet pipe 310 is connected to the cooling unit 200 and the tank 110, And a water supply port (300) for supplying / circulating / returning water to / from the circulation pipe (12) of the mat (10) Device. The air conditioner according to claim 1, wherein the cooling unit (200) comprises:
The discharge side of the heater 130 is connected to the water discharge pipe 310 to form a water pipe and the water pipe is made of a double pipe having the same center so that water flows into the inside pipe 211, An evaporator 210 for cooling the water by performing heat exchange to absorb the heat of the flowing water when the low temperature and low pressure saturated vapor refrigerant is supplied thereto;
A compressor 220 which is connected to the refrigerant discharge side of the evaporator 210 and supplies the low-pressure gaseous refrigerant to the condenser 230 while being compressed by a high-temperature and high-pressure gas;
A condenser 230 connected to the compressor 220 to supply liquefied refrigerant to the expansion valve 240 after liquefying the high-temperature and high-pressure gas refrigerant by a heat dissipation function;
When the liquefied refrigerant is supplied to the condenser 230, the refrigerant is decompressed to a pressure capable of causing evaporation by the throttling action to convert the refrigerant into a low-temperature and low-pressure saturated steam, and then supplies the saturated vapor refrigerant to the evaporator 210 And an expansion valve (240) for circulating the hot and cold water. The apparatus of claim 1, wherein the valve (120) comprises:
A blocking wall 121 having a space defined by the water storage space 112 inside the tank 110 and having a valve seat 125 as a through hole connected to the water storage space 112 at one side;
A guide rod 122a provided at one side of the blocking wall 121 is transported before and after the guide rod 122a is fitted in the center of the valve seat 125 and is integrated with the guide rod 122a A diaphragm 122 having a structure in which a valve plate 122b formed as a disk plate opens or closes a through hole of the valve seat 125;
Further comprising an elastic member (123) interposed between the diaphragm (122) and the blocking wall (121) to elastically support the diaphragm (122)
Wherein when the water is supplied by the operation of the pump (111), the diaphragm (122) closes and closes the valve seat (125) by the water supply pressure of the pump (111) . The method according to claim 1,
The water supply port 300 measures the temperature of the water returning to the tank 110 by the recovery pipe 320 and operates either the heater 130 or the cooling unit 200 And a temperature sensor (321) for controlling the temperature of the hot water. The method according to claim 1,
The water supply port 300 is further provided with a solenoid valve 311 for opening and closing the water flow path to the water discharge pipe 310, A water outlet pipe 310 and a return pipe 320 are installed,
The circulating tube (12) is provided with a plurality of water circulating pipes (12) provided on the mat (10) according to opening and closing operations of the solenoid valve (311) Device.

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