KR102479922B1 - Apparatus for injecting combustible refrigerant in fixed quantity - Google Patents

Abstract

The present invention relates to an apparatus for injecting a fixed amount of combustible liquid refrigerant. The apparatus comprises: a refrigerant charging unit for extracting a refrigerant from a refrigerant container and injecting the refrigerant into an object to be charged; and an injection coupling unit extending from the refrigerant charging unit and capable of blocking the refrigerant supplied from the refrigerant charging unit to the object to be charged. The refrigerant charging unit comprises: a case which has an openable/closable door and stores the refrigerant container therein; a heating device which is installed in the case and heats the refrigerant container; a weighing scale for measuring the weight of the refrigerant container; and a controller which controls operation of the heating device. The injection coupling unit may be detachably connected to a refrigerant injection pipe connected to the object to be charged. Therefore, a fixed amount of refrigerant can be injected into an object to be charged such as small home appliances.

Description

Flammable liquefied refrigerant metering injection device {APPARATUS FOR INJECTING COMBUSTIBLE REFRIGERANT IN FIXED QUANTITY}

The present invention relates to a flammable liquefied refrigerant metering device for injecting flammable liquefied refrigerant in a fixed amount into home appliances such as a cold/hot water dispenser and a refrigerator.

A refrigerant is a material that transfers heat during cooling. It is a working fluid that cools the low-temperature part by circulating a cooling cycle inside the refrigerator, evaporating in the low-temperature part to absorb heat from the surroundings, and condensing in the high-temperature part to release heat.

Chlorofluorocarbons (CFCs), commonly referred to as Freon gases, have been widely used in the past because they are chemically stable and have various pressure-temperature characteristics. HCFCs and HFCs, which are developed and used as substitutes, also have a significant effect on global warming, so their use is gradually reduced under the regulation of the Convention on Climate Change, and their use is gradually banned according to the regulatory schedule.

In accordance with such strengthened global regulations, the use of eco-friendly refrigerants having a low global warming potential (GWP) has recently been increasing, and the alternative eco-friendly refrigerants are generally flammable.

Looking at the production process of home appliances such as water heaters and refrigerators that require charging of flammable refrigerant, based on the high-pressure gas method, a refrigerant storage facility is installed outside the factory, pressurized with a pump, and supplied to the production line inside the factory through pipes. It is common to charge refrigerant in household appliances. However, since there is a high risk of safety accidents when using pressurization devices for flammable refrigerants, the High Pressure Gas Act strictly regulates related matters.

In addition, in order to operate such a refrigerant charging facility, a high-pressure gas production permit must be obtained and two safety managers must be placed. In addition, since small appliances have a smaller charge amount of refrigerant compared to large appliances, refrigerant injection is relatively more important.

Republic of Korea Utility Model Registration No. 20-0180654 (Announced on May 15, 2000)

An object of the present invention is to provide a flammable liquefied refrigerant metering device capable of injecting a flammable liquefied refrigerant into a charged object such as a small electric appliance in a stable manner through temperature control of a refrigerant container.

The present invention for solving the above problems relates to a flammable liquefied refrigerant metering device. The device includes a refrigerant charging unit for extracting refrigerant from a refrigerant container and injecting the refrigerant into the object to be charged, and an injection coupling unit extending from the refrigerant charging unit and capable of blocking the refrigerant supplied from the refrigerant charging unit to the object to be charged. A flammable liquefied refrigerant metering injection device, wherein the refrigerant charging unit includes: a case having an openable and closeable door and accommodating a refrigerant container therein; a heating device installed in the case and configured to heat the refrigerant container; a weighing scale for measuring the weight of the refrigerant container; and a controller controlling operation of the heating device, and the injection coupling unit may be detachably connected to a refrigerant injection pipe connected to the object to be charged.

According to an embodiment of the present invention, the heating device may include a water jacket disposed to surround the refrigerant container and circulating hot water therein; a hot water heater for heating the hot water; a hot water pump providing transfer power to the hot water supplied from the hot water heater to the water jacket; and a temperature sensor for measuring the temperature of the circulating hot water, and the controller may stop the operation of the hot water heater when the temperature of the hot water measured by the temperature sensor is equal to or higher than a set temperature.

According to an embodiment of the present invention, a space surrounded by the water jacket and the door of the case is defined as a mounting space in which a refrigerant container is mounted, and the heating device uniformly heats the refrigerant container by heat dissipated from the water jacket. A fan circulating air in the mounting space to be heated may be further included.

According to an embodiment of the present invention, the weighing scale is disposed on the upper side of the refrigerant container, the refrigerant container is mounted on the weighing scale through a hanger line, and on the lower side of the refrigerant container, a refrigerant container capable of lifting the refrigerant container An elevating lift may be provided.

According to an embodiment of the present invention, the refrigerant charging unit includes a pressure sensor for measuring the pressure of the refrigerant discharged from the refrigerant container, and the controller determines that the pressure of the refrigerant measured by the pressure sensor is a set pressure. It is possible to control the operation of the heating device to maintain.

According to an embodiment of the present invention, the refrigerant charging unit includes a gas-liquid separator for receiving refrigerant from the refrigerant container and supplying the refrigerant to the injection coupling unit, and in the gas-liquid separator, a liquid portion and a vapor portion of the refrigerant are separated And, the liquid portion of the refrigerant may be supplied to the injection coupling unit through a pipe.

According to an embodiment of the present invention, the refrigerant charging unit may include a regulator installed between the refrigerant container and the gas-liquid separator.

According to an embodiment of the present invention, the injection coupling unit, the cylinder body having a hollow; a plunger formed to be movable back and forth within the cylinder body and having a through hole through which a refrigerant flows; a blocking member installed in front of the plunger and formed to close the through hole by coming into contact with the plunger when the plunger advances; and a plurality of air inlet openings through which air is injected into the cylinder body, through which the air moves the plunger forward and backward.

According to an embodiment of the present invention, the air inlet includes first and second air inlets spaced apart from each other in the front and back, the first air inlet communicates with the front space of the plunger, and through the first air inlet. The air injected into the front space of the plunger causes the plunger to retreat, the second air inlet communicates with the rear space of the plunger, and the air injected into the rear space of the plunger through the second air inlet opens to the plunger. can advance

According to an embodiment of the present invention, a gas leakage prevention device for preventing gas leakage in the charging object side and the inner space of the case of the refrigerant charging unit is included, and the gas leakage prevention device is disposed on the charging object side. and a first hood for sucking the leaked gas and a first leak detection sensor for detecting a gas leak on the side of the filling object; a second leak detection sensor disposed within the case and detecting a gas leak in the inner space of the case and a second hood for sucking the leaked gas; A ventilation fan installed in a discharge duct extending from the second hood to the outside of the case may include a ventilation fan for discharging gas sucked through the first and second hoods to the atmosphere.

According to the present invention, stability is secured by controlling the temperature of the refrigerant container through a water jacket, and the injection pressure of the refrigerant is uniformly supplied through a gas-liquid separator for intermediate storage of the refrigerant and a regulator for adjusting the pressure of the refrigerant supplied to the gas-liquid separator. can do.

In addition, since stability is ensured compared to a conventional pressurization device for refrigerant using a pump, it can be used by placing it indoors in a factory where a production line is arranged without having a separate facility outside the factory.

In addition, the refrigerant may be injected into a charged object such as a small home appliance in a fixed amount through a hydraulic control structure of the injection coupling unit capable of blocking the refrigerant supplied to the object to be charged.

1 is a view showing the overall configuration of a flammable liquefied refrigerant metering injection device according to the present invention.
FIG. 2 is a view partially showing a structure in which the heating device in FIG. 1 is surrounded by a water jacket so that the temperature of the refrigerant container is controlled through the water jacket.
FIG. 3 is a side cross-sectional view schematically illustrating a state in which an air circulation path between a refrigerant container and a water jacket is formed by a fan in FIG. 2 .
4 is a side cross-sectional view showing a detailed configuration of the injection coupling unit in FIG. 1;

Hereinafter, specific details for the practice of the present invention will be described with reference to the accompanying drawings. And, in the description of the present invention, if it is determined that the related known function may unnecessarily obscure the subject matter of the present invention as an obvious matter to those skilled in the art, the detailed description thereof will be omitted.

1 is a view showing the overall configuration of a flammable liquefied refrigerant metering injection device according to the present invention. FIG. 2 is a view partially showing a structure in which the heating device in FIG. 1 is surrounded by a water jacket so that the temperature of the refrigerant container is controlled through the water jacket.

1 and 2, the flammable liquefied refrigerant metering injection device according to the present invention includes a refrigerant charging unit 100 for extracting the refrigerant from the refrigerant container 10 and injecting the refrigerant into the object to be charged 20, the refrigerant charging unit It includes an injection coupling unit 200 capable of blocking the refrigerant supplied to the object to be charged 20 from 100, and a gas leakage prevention device 300 for preventing gas leakage in the process.

The refrigerant container 10 is formed in a cylindrical shape and accommodates an eco-friendly combustible liquefied gas refrigerant such as isobutane to be supplied to a refrigerant charging unit of a small home appliance therein. A gas valve 11 is provided at an upper end of the refrigerant container 10, and a gas flow path connected to the gas valve 11 is controlled to open and close according to the opening and closing of the gas valve 11. Inside the refrigerant container 10, a discharge pipe 12 connected to the gas valve 11 and extending downward is provided. The liquid refrigerant is extracted from the refrigerant container 10 through the discharge pipe 12 to the outside. A protective plate 13 having an arc shape partially surrounding the gas valve 11 may be provided at an upper end of the refrigerant container 10 to protect the gas valve 11 . The refrigerant container 10 is provided with a hanger line 14 allowing the refrigerant container 10 to be suspended. Both ends of the hanger line 14 may be coupled and fixed to the protective plate 13 .

The refrigerant charging unit 100 includes a case 110, a heating device 120, a weighing scale 130, a gas-liquid separator 140, a regulator 150, and a controller 160. The refrigerant charging unit 100 is disposed together with the charging object 20 in the interior of the factory where the production line is arranged. The plurality of objects to be charged 20 are sequentially charged while moving along the conveyor 21 .

The case 110 has a door 111 that can be opened and closed and accommodates a refrigerant container therein. The case 110 forms the outer shape of the refrigerant charging unit 100, and a space is provided in which the above components of the refrigerant charging unit 100 can be installed. A worker may install and replace the refrigerant container 10 inside the case 110 by opening the door 111 of the case 110 .

The heating device 120 is installed in the case 110 and may heat the refrigerant container 10 . The heating device 120 is disposed to surround the refrigerant container 10 and includes a water jacket 121 in which hot water circulates, and a hot water heater 122 for heating the hot water. The water jacket 121 may be formed in a semi-cylindrical structure partially surrounding the refrigerant container 10 to the side of the refrigerant container 10, and the space surrounded by the water jacket 121 and the door 111 is the refrigerant container ( 10) is defined as the mounting space (p) in which it is mounted. A flow path for hot water flow is formed inside the water jacket 121 . Heat of the hot water flowing through the passage is provided to the refrigerant container 10 through the inner surface of the water jacket 121 .

The hot water heater 122 heats hot water circulating therein and supplies it to the water jacket 121 . The hot water heater 122 may be disposed at a spaced position separated from the mounting space p. An explosion-proof member may be installed between the water jacket 121 and the hot water heater 122. The heating device 120 includes a hot water pump (not shown) for providing transfer power to the hot water supplied from the hot water heater 122 to the water jacket 121, and a temperature sensor 123 for measuring the temperature of the circulating hot water. can include

The controller 160 may control the operation of the hot water heater 122 and the hot water pump of the heating device 120, respectively. The controller 160 controls the temperature of the hot water circulating through the water jacket 121 by operating the hot water heater 122 and provides circulation power through which the hot water circulates through the water jacket 121 through the hot water pump. The hot water circulating through the water jacket 121 may heat the refrigerant container 10 so that the temperature of the refrigerant in the refrigerant container 10 reaches a saturation temperature corresponding to the set pressure. The vapor pressure formed in the refrigerant container 10 is determined by the temperature of the refrigerant.

The controller 160 may adjust the temperature of hot water in the water jacket 121 to be higher than room temperature in summer. For example, by setting and controlling the hot water temperature at about 40° C., the refrigerant charging unit 100 can always charge the object to be charged with the refrigerant at a constant pressure regardless of the season or weather. Meanwhile, the controller 160 may stop the operation of the hot water heater 122 when the temperature of the hot water measured by the temperature sensor 123 is equal to or higher than a set temperature. If the temperature of the refrigerant in the refrigerant container 10 is excessively high and the charging pressure becomes too high, the stability deteriorates. The controller 160 adjusts the temperature of the refrigerant in the refrigerant container 10 to be maintained at a constant temperature regardless of the season or climate, for example, to 40 degrees, which is slightly higher than the temperature in summer.

FIG. 3 is a side cross-sectional view schematically illustrating a state in which an air circulation path between a refrigerant container and a water jacket is formed by a fan in FIG. 2 .

Referring to FIG. 3 , the heating device 120 may further include a fan 124 for circulating air in the mounting space p so that the refrigerant container 10 is uniformly heated by heat dissipated from the water jacket 121. can The refrigerant container 10 is mounted in the mounting space p, and since the refrigerant container 10 is spaced apart from the water jacket 121, a space in which air can circulate is formed in the mounting space p. The fan 124 may be provided at the rear of the water jacket 121, and the air circulated by the fan 124 flows from the water jacket 121 while circulating in a space between the refrigerant container 10 and the water jacket 121. Generated heat is uniformly transferred to the refrigerant container (10). The vapor pressure formed in the refrigerant container 10 is determined by the temperature of the liquefied refrigerant in the refrigerant container 10, so that the liquefied refrigerant is heated to a constant temperature regardless of the remaining amount of refrigerant in the refrigerant container 10 It is advantageous to make the mounting space (p) where is placed have a constant temperature.

Meanwhile, insulators are disposed on portions surrounding the mounting space p, for example, the inner surface of the door 111, upper and lower ends of the mounting space p, to avoid interference with other components. Meanwhile, a rear door 112 for installing the controller 160 is installed at the rear of the case 110, and the controller 160 is isolated from the heating device 120.

The weighing scale 130 may measure the weight of the refrigerant container 10 disposed in the mounting space p. The weighing scale 130 is disposed on the upper side of the refrigerant container 10, and the refrigerant container 10 is mounted on the weighing scale 130 through the hanger line 14. The weighing scale 130 includes a hook for suspending and fixing the hanger line 14 connected to the refrigerant container 10 . The weighing scale 130 may be composed of a load cell, and the weighing value measured by the weighing scale 130 is transmitted to the controller 160 in real time. The controller 160 calculates the remaining amount of refrigerant in the refrigerant container 10 by comparing the measured value with the tare weight of the previously stored refrigerant container 10 . The controller 160 informs the operator of the replacement time of the refrigerant container 10 based on the calculated residual amount of refrigerant. Through this, it is possible to prevent in advance a process defect in which a metered amount of injection is not performed due to a lack of refrigerant in the refrigerant container 10 .

A lifting lift 131 capable of moving the refrigerant container 10 up and down is provided below the refrigerant container 10 . The lifting lift 131 may be a hydraulic lift, and the lifting lift 131 raises the refrigerant container 10 so that the hanger line 14 of the refrigerant container 10 can be hung on the hook of the weighing scale 130. . After the hanger line 14 is caught on the hook, the elevating lift 131 descends, and the refrigerant container 10 is maintained hanging on the weighing scale 130 so that the weight is measured.

The gas-liquid separator 140 is disposed in the case 110 and receives refrigerant from the refrigerant container 10 and supplies it to the injection coupling unit 200 . The gas-liquid separator 140 is formed in the form of a chamber having a space capable of accommodating a refrigerant therein. A pipe extending from the refrigerant container 10 is connected to an upper portion of the gas-liquid separator 140, and a refrigerant outlet of the gas-liquid separator 140 is located at a lower portion of the gas-liquid separator 140. The liquid and vapor parts of the refrigerant are separated in the gas-liquid separator 140, and the liquid part of the refrigerant is supplied to the injection coupling unit 200 through a pipe.

A regulator 150 is installed between the refrigerant container 10 and the gas-liquid separator 140 . The regulator 150 regulates the pressure of the refrigerant supplied from the refrigerant container 10 to the gas-liquid separator 140 to a predetermined discharge pressure. The regulator 150 is designed to lower the outlet pressure to a set value. A pressure sensor 151 for measuring the pressure of the refrigerant discharged from the refrigerant container 10 is provided between the refrigerant container 10 and the regulator 150 . The controller 160 may control the operation of the heating device 120 so that the pressure of the refrigerant measured by the pressure sensor 151 maintains the set pressure.

The controller 160 controls the operation of the heating device 120 using the pressure sensor 151 so that the pressure of the refrigerant supplied from the refrigerant container 10 is kept constant. When the operation of the heating device 120 is controlled by the sensing value of the pressure sensor 251, the controller 160 may set and control the pressure value in a predetermined range having upper and lower limits, and the regulator 150 This ensures that constant pressure is always output.

The regulator 150 lowers the pressure of the refrigerant input to a set discharge pressure to be output, so that the pressure of the refrigerant discharged through the regulator 150 is maintained constant.

Meanwhile, a second pressure sensor 152 may be installed in the gas-liquid separator 140 to measure the pressure of the refrigerant in the gas-liquid separator 140 .

The refrigerant charging unit 100 according to the present invention is configured such that the pressure value measured by the second pressure sensor 152 is constantly maintained at the set pressure value. The pressure value measured by the second pressure sensor 152 is provided to the controller 160, and the controller 160 calculates the error of the refrigerant charging unit 100 from the pressure value measured by the second pressure sensor 152 and It is possible to determine whether there is a malfunction.

According to an embodiment of the present invention, a cooling unit (not shown) capable of cooling the gas-liquid separator 140 may be provided. The cooling unit provided in the gas-liquid separator 140 cools the gas-phase refrigerant in the gas-liquid separator 140 into a liquid phase so that it can be filled, thereby preventing an injection amount error due to gas mixing in the refrigerant passing through the refrigerant charging unit 100.

4 is a side cross-sectional view showing a detailed configuration of the injection coupling unit in FIG. 1;

Referring to FIG. 4 , the injection coupling unit 200 is detachably connected to the refrigerant injection pipe 22 connected to the object to be charged 20 . The injection coupling unit 200 includes a cylinder body 210, a plunger 220, a blocking member 230, and a control liquid injection port 240.

Cylinder body 210 is formed to have a cylindrical shape and a hollow. The cylinder body 210 has both ends coupled to the front body 211 on the side connected to the filling object 20, the rear body 212 on the opposite side, and the front body 211 and the rear body 212, and air is injected. and an intermediate body 213 formed with a plurality of air supply passages 213a. The hollows of the front body 211 and the rear body 212 have approximately the same diameter, and the hollows of the middle body 213 have a larger diameter than the diameters of the front body 211 and the rear body 212. A space surrounded by the front body 211, the middle body 213, and the rear body 212 is defined as a movement space s in which the plunger 220 can move back and forth. The air supply passage 213a of the intermediate body 212 receives air from the air supply unit 243 (see FIG. 1 ), and the supply of air is controlled through the air supply valve 244 .

The plunger 220 is formed to be movable back and forth in the moving space s in the cylinder body 210, and a through hole 221 through which a refrigerant can flow is formed. Refrigerant is supplied from the gas-liquid separator 140 to the plunger 220, and the amount of the supplied refrigerant is measured by the mass flow meter 170 (see FIG. 1). The front end of the plunger 220 is fitted into the front body 211 of the cylinder body 210, and the rear end of the plunger 220 is fitted into the rear body 212 of the cylinder body 210. The middle part of the plunger 220 is designed to be able to move back and forth within the movement space (s). The diameter of the middle portion of the plunger 220 is formed to be the same as the diameter of the hollow of the middle body 213 of the cylinder body 210.

The blocking member 230 is installed in front of the plunger 220 and is formed to close the through hole 221 by coming into contact with the plunger 220 by the advancement of the plunger 220 . To this end, the diameter of the blocking member 230 is larger than that of the through hole 221 . The blocking member 230 is fixed to the front body 211 of the cylinder body 210 and is disposed in a hollow in the front body 211 . A refrigerant passing passage 231 through which the refrigerant can flow through the blocking member 230 is formed in front of the blocking member 230 , which is a side connected to the object to be charged 20 .

The air inlet 240 is plural and forms a passage through which air is injected into the cylinder body 210 . The air inlet 240 is formed at an end of the air supply passage 213a. The air inlet 240 is an opening through which air is injected into the cylinder body 210 . Air injected into the moving space s in the cylinder body 210 through the air injection hole 240 may move the plunger 220 back and forth.

The air inlet 240 includes first and second air inlets 241 and 242 spaced apart from each other in the front and rear directions. The first air inlet 241 is in communication with the front space s1 of the plunger 220, and the air injected into the front space s1 of the plunger 220 through the first air inlet 241 is transferred to the plunger 220. retreat Accordingly, the plunger 220 moves away from the blocking member 230 . The second air inlet 242 communicates with the rear space s2 of the plunger 220, and the air injected into the rear space of the plunger 220 through the second air inlet 242 advances the plunger 220. . Accordingly, the plunger 220 comes into contact with the blocking member 230 .

Right before the charging of the refrigerant in the object 20 is completed, the controller 160 controls the valve so that the air of the air supply unit 243 is injected through the second air inlet 242 . Accordingly, the plunger 220 comes into contact with the blocking member 230 to close the through hole 221, and the refrigerant supplied to the object to be charged 20 is blocked. After that, the operator connects the injection coupling unit 200 to the object 20 to be charged with refrigerant. The controller 160 controls the valve so that air from the air supply unit 243 is injected through the first air inlet 241 . Accordingly, the through hole 221 is opened as the plunger 220 moves away from the blocking member 230, and the refrigerant is supplied to the object 20 to be charged.

Referring back to FIG. 1 , the gas leakage prevention device 300 is configured to prevent gas leakage from the charging object 20 side and the case 110 inner space of the refrigerant charging unit 100 . The gas leak prevention device 300 includes a first leak detection sensor 311, a first hood 312, a second leak detection sensor 321, a second hood 322, and a ventilation fan 330.

The first leak detection sensor 311 and the first hood 312 are disposed on the side of the charging object 20 . The first leak detection sensor 311 detects a gas leak on the charging object 20 side. The first hood 312 sucks gas leaked from the side of the object to be charged 20 . The second leak detection sensor 321 and the second hood 322 are disposed within the case 110 of the refrigerant charging unit 100 . The second leak detection sensor 321 detects a gas leak in the inner space of the case 110 . The second hood 322 sucks the leaked gas in the inner space of the case 110 . The ventilation fan 330 is installed in the discharge duct 331 extending from the second hood 322 to the outside of the case 110, and blows gas sucked through the first and second hoods 312 and 322 into a forced blower ( 332) to the atmosphere.

The scope of protection in this field is not limited to the descriptions and expressions of the embodiments explicitly described above. In addition, it is added once again that the protection scope of the present invention cannot be limited due to obvious changes or substitutions in the technical field to which the present invention belongs.

10: refrigerant container 11: gas valve
12: discharge pipe 13: protective plate
14: hanger line 20: charging object
21: conveyor 22: refrigerant injection pipe
100: refrigerant charging unit 110: case
111: door 112: rear door
120: heating device 121: water jacket
122: hot water heater 123: temperature sensor
124: fan 130: weighing scale
131: elevating lift 140: gas-liquid separator
150: regulator 151: pressure sensor
152: second pressure sensor 160: controller
200: injection coupling unit 210: cylinder body
211: front body 212: rear body
213: intermediate body 213a: air supply passage
220: plunger 221: through hole
230: blocking member 240: control liquid inlet
241: first air inlet 242: second air inlet
243: air supply valve 244: air supply unit
300: gas leakage prevention device
311: first leak detection sensor 312: first hood
321: second leak detection sensor 322: second hood
330: ventilation fan 331: discharge duct
332: forced blower
p: mounting space
s: space to move
s1: anterior space
s2: space behind

Claims (10)

Combustible liquefaction comprising a refrigerant charging unit for extracting refrigerant from a refrigerant container and injecting the refrigerant into the object to be charged, and an injection coupling unit extending from the refrigerant charging unit and capable of blocking the refrigerant supplied from the refrigerant charging unit to the object to be charged. As a refrigerant metering device,
The refrigerant charging unit,
A case having a door that can be opened and closed and accommodating a refrigerant container therein;
a heating device installed in the case and configured to heat the refrigerant container;
a weighing scale for measuring the weight of the refrigerant container; and
A controller for controlling the operation of the heating device,
The injection coupling unit is detachably connected to the refrigerant injection pipe connected to the object to be charged,
The heating device,
a water jacket disposed to surround the refrigerant container and circulating hot water therein;
a hot water heater for heating the hot water;
a hot water pump providing transfer power to the hot water supplied from the hot water heater to the water jacket; and
A temperature sensor for measuring the temperature of the circulating hot water,
The controller stops the operation of the hot water heater when the temperature of the hot water measured by the temperature sensor is equal to or higher than a set temperature,
The refrigerant charging unit,
A gas-liquid separator receiving refrigerant from the refrigerant container and supplying the refrigerant to the injection coupling unit;
A liquid portion and a vapor portion of the refrigerant are separated in the gas-liquid separator, and the liquid portion of the refrigerant is supplied to the injection coupling unit through a pipe.
delete According to claim 1,
The space surrounded by the water jacket and the door of the case is defined as a mounting space in which a refrigerant container is mounted,
The heating device,
The flammable liquefied refrigerant metering device further comprising a fan circulating air in the mounting space so that the refrigerant container is uniformly heated by heat dissipated from the water jacket.
According to claim 1,
The weighing scale is disposed above the refrigerant container, and the refrigerant container is mounted on the weighing scale through a hanger line,
A flammable liquefied refrigerant metering device, characterized in that a lifting lift capable of lifting the refrigerant container is provided at the lower side of the refrigerant container.
According to claim 1,
The refrigerant charging unit,
A pressure sensor for measuring the pressure of the refrigerant discharged from the refrigerant container,
The controller controls the operation of the heating device so that the pressure of the refrigerant measured by the pressure sensor maintains the set pressure.
delete According to claim 1,
The refrigerant charging unit,
A flammable liquefied refrigerant metering device comprising a regulator installed between the refrigerant container and the gas-liquid separator.
According to claim 1,
The injection coupling unit,
Cylinder body having a hollow;
a plunger formed to be movable back and forth within the cylinder body and having a through hole through which a refrigerant flows;
a blocking member installed in front of the plunger and formed to close the through hole by coming into contact with the plunger when the plunger advances; and
As an opening through which air is injected into the cylinder body, the flammable liquefied refrigerant metering device comprising a plurality of air injection ports through which the air can move the plunger forward and backward.
According to claim 8,
The air inlet includes first and second air inlets spaced apart from each other in front and rear,
The first air inlet communicates with the front space of the plunger, and the air injected into the front space of the plunger through the first air inlet retracts the plunger,
The second air inlet communicates with the rear space of the plunger, and the air injected into the rear space of the plunger through the second air inlet advances the plunger.
According to claim 1,
And a gas leakage prevention device for preventing gas leakage in the charging object side and the inner space of the case of the refrigerant charging unit,
The gas leakage prevention device,
a first hood disposed on the side of the object to be charged and sucking the leaked gas and a first leak detection sensor for detecting gas leakage on the side of the object to be charged;
a second leak detection sensor disposed within the case and detecting a gas leak in the inner space of the case and a second hood for sucking the leaked gas; and
A flammable liquefied refrigerant metering device comprising a ventilation fan installed in a discharge duct extending from the second hood to the outside of the case and discharging gas sucked through the first and second hoods to the atmosphere. .

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