KR20170121475A - Apparatus for controlling of meat dryer - Google Patents

Abstract

The present invention relates to a meat dryer control device. According to an embodiment of the present invention, the meat dryer control device includes: a suction unit which draws air into a storage chamber storing meat used as a drying target through inner or outer suction holes; a sensing unit which senses the environment information; a heat exchange unit which exchanges heat between the inside air drawn in through the inner suction hole and the outside air drawn in through the outer suction hole through the environment information and preset drying conditions; a heat source generation unit controlling the fan blowing strength and flow rate of the refrigerant in a condenser and an evaporator in accordance with the environment information and drying conditions; an air flowing unit which switches the flow of the inside and outside air in accordance with the environment information and preset drying conditions as well as moving the inside or outside air to a path connected to the evaporator or condenser of the heat source generation unit; a discharging unit which discharges the air through inner or outer outlets in linkage with the air suction unit in accordance with internal environment information; and a control unit which controls the suction unit, air flowing unit, heat exchange unit, heat source generation unit, discharging unit, and sensing unit while selecting one of the inner air freeze-drying mode, inner air heating and drying mode, outer air freeze-drying mode, and defrosting and drying mode to control the flow path of the inner and outer air.

Description

[0001] APPARATUS FOR CONTROLLING OF MEAT DRYER [0002]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a meat dryer control device, and more particularly, to a technique for aging and drying a meat while maintaining the flavor of meat.

In general, temperature is the main control factor for products sold as aging refrigerators that store meat aged. Compared with the existing commercial refrigerator, the air cooling function is strengthened, but it is below the wind speed condition required for the drying and it is difficult to sell the meat to the consumer when the drying aging is performed in the product. This is because the humidity condition is not directly or indirectly controlled, and there is a limit in which the humidity, temperature, and wind speed, which are conditions required for dry aging, can not be comprehensively controlled.

Korean Patent Registration No. 1261405 (published on Mar. 5, 2013) of the prior art discloses an apparatus for drying and aging meat, comprising an aging part for storing and aging meat, A humidifying portion for humidifying the inside of the aged portion, and a dehumidifying portion for dehumidifying or raising the temperature in the aged portion. However, the above-mentioned conventional techniques have limitations in that they do not control the wind speed which affects the taste of dried aged meat.

The present invention provides a meat dryer control device capable of aging and drying meat by controlling temperature, humidity and wind speed of a meat dryer, and drying and ventilating by exchanging air inside and outside .

The meat dryer control apparatus according to an embodiment of the present invention includes a suction unit for sucking air into a storage chamber for storing meat drift materials through an internal suction port or an external suction port and a control unit for controlling a temperature of the inside and outside of the storage chamber, A heat exchanging unit for exchanging heat between the indoor air sucked through the inner air inlet and the outdoor air sucked through the outer air inlet in accordance with predetermined drying conditions and the environment information, A heat source generating unit for controlling the amount of heat generated by controlling the flow rate of the refrigerant and the fan blowing amount of the evaporator and the condenser according to the drying condition and the environmental information, and a controller for switching the flow of the inside air and the outside air according to the drying condition and the environment information An air moving unit for moving the inside air or outside air to a path connected to the evaporator or the condenser of the heat source generating unit, A discharge unit for discharging air through an internal discharge port or an external discharge port in cooperation with the air suction unit according to the internal environment information; and a discharge unit for discharging air through the suction unit, the air moving unit, the heat exchange unit, And a control unit for controlling the movement path of the inside air and the outside air by controlling the sensing unit to select one of the outdoor air freeze drying mode, the indoor air heating drying mode, the outdoor air cooling drying mode, or the defrost drying mode according to the drying condition .

In addition, the controller may control the drying condition so that the temperature inside the storage chamber is maintained at 1 to 4 DEG C, the humidity is 60 to 85%, and the wind speed is 0.5 to 2 m / s.

The air conditioner may further include a pollution degree detector for analyzing the weather forecast of the predetermined range to determine whether the average air pollution level of the outdoor air exceeds a preset reference pollution degree, And a second path connected to the condenser, wherein the bypass path is opened in the heat exchanging unit to open the bypass path between the inside air and the outside air to convert the inside air into a first path connected to the evaporator, And the external outlet is connected to the fourth path connected to the condenser so that the external air can be prevented from flowing into the third path.

The sensing unit may include a gas sensing unit for electrochemically reacting with the gas generated from the meat drifting object to sense the gas, a gas classifying unit for classifying the sensed gas by using a statistical learning algorithm, And an aging degree judging unit for judging the degree of aging of the meat dry matter by comparing the ratio of constituent components of the classified gas with a preset reference constituent ratio, wherein the controller controls the drying condition according to the degree of aging of the meat dry matter To be changed.

The apparatus may further include an odor eliminating unit for heating and burning the air discharged from the internal discharge port and injecting the heated air through the internal air inlet.

Accordingly, the meat can be aged and dried by controlling the temperature, humidity and wind speed of the meat dryer, and it is possible to dry and ventilate by exchanging the air inside and outside.

1 is an illustration for explaining a meat dryer system,
2 is a configuration diagram of a meat dryer control apparatus according to an embodiment of the present invention,
FIG. 3A to FIG. 3D are views for explaining the flow of air according to the drying mode in the meat dryer control apparatus according to FIG. 2,
FIG. 4 is a detailed configuration diagram of the odor removing unit in the meat dryer control apparatus according to FIG. 2;

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings. The terms used are terms selected in consideration of the functions in the embodiments, and the meaning of the terms may vary depending on the user, the intention or the precedent of the operator, and the like. Therefore, the meaning of the terms used in the following embodiments is defined according to the definition when specifically defined in this specification, and unless otherwise defined, it should be interpreted in a sense generally recognized by those skilled in the art.

Referring to FIG. 1, the meat dryer 10 stores dried meats in a storage chamber 11 and dry-ages them. The structure of the inside of the storage chamber 11 can be changed by user setting. The meat dryer 10 forms a control device 100 and the control device 100 can select a drying mode according to environmental information in consideration of temperature, humidity, wind speed, and the like inside the storage room 11. For example, the drying mode includes an air conditioning cooling drying mode, an indoor heating drying mode, a defrost drying mode, and an outdoor air cooling and drying mode. The cooling and heating is performed by circulating the inside of the storage room or heat exchange between the outside air inside the storage room and the inside of the low- It can also be air-conditioned.

2, the meat dryer control apparatus 100 according to an embodiment of the present invention includes a suction unit 110, a sensing unit 120, an air moving unit 130, a heat exchanging unit 140, a heat source generating unit 150 A discharge unit 160 and a control unit 170. [

The suction unit 110 sucks air through an internal suction port installed in the room or an external suction port installed outside the room. The suction unit 110 adjusts the amount of air sucked in accordance with the variation of the indoor load in conjunction with the discharge unit 160 described later. The suction unit 110 may adjust the suction amount of the internal suction port or adjust the suction amount of the external suction port, but the present invention is not limited thereto. That is, the control unit 170, which will be described later, controls the suction amount of the internal suction port, and the external suction port can suck only the suction amount of the predetermined condition.

The sensing unit 120 senses environmental information inside and outside the storage room. For example, the sensing unit 120 can sense the temperature, humidity, and air pollution level outside the storage compartment as well as the low-room temperature, humidity, wind speed, and air pollution degree. The sensing unit 120 collects environmental information inside and outside the storage room according to a predetermined schedule and outputs the collected environment information to a control unit 170, which will be described later. In this case, the air pollution degree can be determined by whether the concentration of carbon monoxide, carbon dioxide, nitrogen, etc. contained in the air exceeds a preset reference value.

In addition, the sensing unit 120 may sense the weight of the meat dried product stored in the storage room. Meat drier evaporates its own water over time and its weight decreases. The sensing unit 120 senses the weight of the meat to be dried over time and outputs the weight to the controller 170. The controller 170 can determine the dry state according to the weight change of the meat to be dried.

The sensing unit 120 may include a gas sensing unit 121, a gas classifying unit 122, and an aging degree determining unit 123. The gas sensing part 121 electrochemically reacts with the gas generated from the meat dry object to detect the gas. Here, the gas is used to mean a substance in which meat-based dry matter is corroded by an organism and gas is generated. In addition, the gas sensing unit 121 may be composed of a plurality of different characteristic semiconductor chip arrays which react with the gas. In this case, the plurality of semiconductor chips may be a metal oxide semiconductor (MOS), a metal oxide semiconductor field effect transistor (MOSFET), a conducting organic polymer (CP), or a piezoelectric crystals.

The gas classifier 122 classifies the components of the detected gas using a statistical learning algorithm. For example, the gas classifier 122 may classify the detected gas components using at least one of ANN (Artificial Neural Network), SVM (Support Vector Machine), and K-nearest algorithm. For example, among the ANN learning algorithms, the multi-layer ANN consists of an input layer, a hidden layer, and an output layer. The number of neurons in the input layer corresponds to the number of arrays in the semiconductor chip. , And the number of neurons in the output layer corresponds to the number of classes. In this way, the gas classifier 122 classifies the components of the detected gas using a learning algorithm.

The aging degree judging unit 123 judges whether the meat dry matter is aged by comparing the ratio of constituent components of the classified gas with a preset reference constituent ratio. That is, when the proportion of the constituent components of the gas, which are determined from the constituents of the gas and which determine the corruption, exceeds the reference constituent ratio among the constituents of the entire detected gas, the aging degree judging section 123 judges that the object has been aged . In addition, the degree of corruption can be divided into a plurality of stages depending on the ratio of constituent components of the gas, and it is also possible to predict the remaining time until the meat dry matter is aged or decayed.

The air moving part 130 changes the flow of the indoor air sucked through the inner suction port of the suction part 110 and the outdoor air sucked through the outer suction port according to any one of the preset drying modes. In this case, the drying mode may include an air cooling and drying mode, an indoor heating and drying mode, an outdoor air cooling and drying mode, a defrost drying mode, and the like. The air moving part 130 serves to move the indoor air or the outside air to a path connected to the evaporator or the condenser of the heat source generating part 150, which will be described later. In this case, the suction unit 110 can change the flow of the indoor air or the outside air by using a motor (not shown).

The heat exchanging part 140 is connected to the air moving part 130 to perform heat exchange between the inside air and the outside air using a separating plate according to predetermined drying conditions and environmental information. The heat exchanging unit 140 determines whether heat exchange is performed between the inner and outer air, and is controlled by a control unit 170 described later. For example, heat exchange may be performed in the case of the indoor air cooling drying mode or the indoor air heating drying mode in the drying condition, and heat exchange may not be performed in the outdoor air cooling drying mode or the defrost drying mode. In this case, the separator plate is used to directly convey the indoor air or the outside air to the evaporator or the condenser of the heat source generating unit 150 by driving a motor (not shown), or to perform heat exchange and transfer.

The heat source generating unit 150 controls the amount of heat generated by controlling the flow rate of the refrigerant and the fan blowing amount of the evaporator and the condenser according to predetermined drying conditions and environmental information. The heat source generating unit 150 controls the flow rate of the refrigerant flowing through the evaporator and the refrigerant coil of the condenser by operating the refrigerant compressor (not shown) according to the environment information when the drying condition is the indoor air cooling drying mode or the indoor air heating drying mode. In addition, when the drying condition is the outside air cooling drying mode or the defrost drying mode, the heat source generating unit 150 can maintain the wind speed by adjusting only the fan blowing amount.

The discharge unit 160 discharges air through the internal discharge port or the external discharge port in cooperation with the suction unit 110 according to the variation of the indoor load. The discharge unit 160 can adjust the amount of air blown through the internal discharge port and the amount of air blown through the external discharge port can discharge the contaminated air inside the storage compartment to the outside. The discharge unit 160 can adjust the blowing amount of the air in conjunction with the suction unit 110.

The control unit 170 controls the suction unit 110, the sensing unit 120, the air moving unit 130, the heat exchanging unit 140, the heat source generating unit 150, and the discharging unit 160. The control unit 170 controls the suction and discharge of the air in the suction unit 110 and the discharge unit 160 according to the drying condition and the environmental information through the humidity, temperature, and air pollution degree of indoor or outdoor through the sensing unit 120 do. The control unit 170 determines whether to deliver the indoor air or the outside air sucked from the suction unit 110 to the path of the evaporator or the compressor of the heat source generating unit 150. In addition, the control unit 170 controls the heat exchange unit 140 to perform heat exchange between the inside air and the outside air. In addition, the controller 170 controls the flow rate of the refrigerant or the fan blowing amount in the evaporator or the condenser of the heat source generator 150. A concrete control operation of the control unit 170 will be described later.

Meanwhile, the meat dryer control apparatus 100 according to another embodiment of the present invention may further include a pollution degree detecting unit 180. The pollution degree detector 180 analyzes the weather forecast of the predetermined range to determine whether the average air pollution level of the outside air exceeds the preset reference pollution degree. For example, the pollution degree detecting unit 180 obtains information on the dust concentration or the dust concentration from the weather forecasting unit (not shown) of the local time unit, daily unit, week unit, month unit, can do.

In this case, when the average air pollution degree of the outside air predicted from the weather forecast exceeds the predetermined reference pollution degree, the control unit 170 may set the outside air to be prevented from entering the inside air in preference to the drying condition. In addition, the control unit 170 can generate and control an annual drying schedule based on the average air pollution degree on a time unit, a day unit, a week unit, a month unit, and an annual unit drying schedule.

Meanwhile, the meat dryer control apparatus 100 according to another embodiment of the present invention may further include an odor eliminating unit 190. The deodorizer 190 heats and combusts the air discharged from the inner discharge port and injects the heated air through the inner suction port. The purpose of the present invention is to remove the odor generated in the inside of the storage compartment through the heating combustion. This allows additional drying air to be injected into the storage compartment to increase the drying effect.

3A to 3D are diagrams for explaining the flow of air according to the drying mode of the meat dryer control apparatus according to FIG.

Referring to FIG. 3A, when the meat dryer control device is in the air-cooling mode, the control unit switches the inside air sucked from the internal air inlet 311 of the suction unit 310 to a first path connected to the evaporator 351, And controls the air moving part 330 to switch the outside air sucked from the suction port 312 to the second path connected to the condenser 352. [ Next, the control unit controls the heat exchanging unit 340 to shut off the bypass path by using the separating plate 341 to perform heat exchange between the sucked inside air and the outside air. Next, the control unit controls the evaporator 351 to supply the heat-exchanged ambient air to the evaporator 351, and the indoor air to be supplied to the condenser. The fresh outside air passes through the evaporator 352 after the heat exchange, And the indoor air contaminated by the indoor air is discharged to the external discharge port 362 through the condenser 351 to cool and dry the inside of the storage room and to control the ventilation.

Next, the control unit senses the temperature, humidity, and wind speed of the heat-exchanged air supplied to the evaporator 351 and the condenser 352 of the heat source generator 350 and calculates the refrigerant flow rate and the fan airflow rate of the heat source generator 350 To reach the preset temperature, humidity and wind speed. In addition, when the heat source generating unit 350 reaches a predetermined temperature and humidity, the control unit can control the wind speed while shutting off the refrigerant flow rate and maintaining the fan blowing amount for ventilation. The control unit controls the internal discharge port 361 of the discharge unit 360 to be connected to the third path connected to the evaporator 351 and the external discharge port 362 to be connected to the fourth path connected to the condenser 352 do.

In this case, the air flow in the heat source generating unit 350 is changed from the evaporator 351 side to the condenser 352 side, and the outside air is changed from the condenser 352 to the evaporator 351 side to supply the outside air to the internal discharge port 361. That is, the outside air moves from the second route to the third route, and the bet is connected from the first route to the fourth route. Thus, the heat source loss can be minimized, and the air can be purified while cooling and drying the inside of the storage compartment.

3B, when the meat dryer control apparatus is in the indoor heating and drying mode, the control unit switches the outside air sucked from the external air inlet 312 of the air inlet unit 310 to the first path connected to the evaporator 351, And controls the air moving part 330 to switch the inside air sucked from the internal air inlet 311 to the second path connected to the condenser 352. [ Next, the control unit controls the heat exchanging unit 340 to shut off the bypass path by using the separating plate 341 to perform heat exchange between the sucked inside air and the outside air. Then, the control unit controls the condenser 352 so that the outdoor air is supplied to the evaporator 351. The fresh air flows through the condenser 352 after the heat exchange, And the inside of the meat is discharged to the outside outlet 362 through the evaporator 351 to heat and dry the inside of the storage compartment and to ventilate the inside of the storage compartment.

Next, the controller senses the temperature of the heat-exchanged air supplied to the evaporator 351 and the condenser 352 of the heat source generator 350 and controls the flow rate of the refrigerant and the fan blowing amount of the heat source generator 350, Temperature, humidity and wind speed. In addition, when the heat source generating unit 350 reaches the predetermined temperature and humidity, the control unit can control the flow rate of the refrigerant to be shut off, and the ventilation can be performed while maintaining the fan blowing amount and maintaining the wind speed inside the storage room.

Next, the control unit causes the external discharge port 362 of the air discharge unit 360 to be connected to the third path connected to the evaporator 351 and the internal discharge port 361 to be connected to the fourth path connected to the condenser 352 . In this case, in the heat source generating unit 350, the outside air is changed from the evaporator 351 side to the condenser 352 side, while the inside air is changed from the condenser 352 to the evaporator 351 side to supply the outside air to the internal discharge port 361. That is, the outside air moves from the first path to the fourth path, and the inside air is connected from the second path to the third path. Thus, the heat source loss can be minimized, the inside of the storage compartment can be heated and dried, and the air can be purified.

Referring to FIG. 3C, when the drying condition of the meat dryer control device is the defrost drying mode, the control unit switches the inside air sucked from the internal air inlet 311 of the suction unit 310 to the first path connected to the evaporator 351 , And controls the air moving part (330) to switch the outside air sucked from the external air inlet (312) to a second path connected to the condenser (352). Next, the control unit opens the bypass path by using the separation plate 341 of the heat exchange unit 340 to control the heat exchange between the sucked inside air and the outside air to be blocked. Next, the control unit may control the fan blowing amount so that the indoor air flows into the evaporator 351 of the heat source generating unit 350 and the outdoor air is supplied to the condenser 352. The control unit controls the internal discharge port 361 of the air discharge unit 360 to be connected to the third path connected to the evaporator 351 and the external discharge port 362 to be connected to the fourth path connected to the condenser 352 .

Referring to FIG. 3D, when the drying condition of the meat dryer control device is in the outdoor air cooling and drying mode, the control unit controls the outdoor air sucked from the external suction port 312 of the air suction unit 310 to the first path connected to the evaporator 351 And controls the air moving part 330 to switch the sucked in air from the inner suction port 311 to the second path connected to the condenser 352. [ Next, the control unit opens the bypass path by using the separation plate 341 of the heat exchange unit 340 to control the heat exchange between the sucked inside air and the outside air to be blocked. Next, the control unit senses the temperature of the heat-exchanged air supplied to the evaporator 351 and the condenser 352 of the heat source generator 350 and controls the flow rate of the refrigerant and the amount of fan blowing of the heat source generator 350 To reach the preset temperature, humidity and wind speed. In addition, the control unit can control to shut off the refrigerant flow rate so that the room can reach the predetermined temperature and humidity, maintain the air flow rate only by the fan blowing amount, and ventilate simultaneously with the outdoor air cooling.

The control unit controls the internal discharge port 361 of the air discharge unit 360 to be connected to the third path connected to the evaporator 351 and the external discharge port 362 to be connected to the fourth path connected to the condenser 352 . In this case, the air flow in the heat source generating unit 350 is changed from the evaporator 351 side to the condenser 352 side, and the outside air is changed from the condenser 352 to the evaporator 351 side to supply the outside air to the internal discharge port 361. That is, the outside air moves from the second path to the fourth path, and the inside air is connected from the first path to the third path. Thus, the heat source loss can be minimized and the air can be purified.

FIG. 4 is a detailed configuration diagram of the odor removing unit in the meat dryer control apparatus according to FIG. 2;

4, the deodorizer 400 includes a heat dissipating rod 410, a flow pipe 420, an inner casing 430, and an outer casing 440.

The heat dissipating rod 410 is a heat generating element in which a spiral heat dissipating plate is formed along the outer peripheral surface of the circular rod. The heat dissipating rod 410 is formed of a metal material and is connected to an electric wire to be heated to a high temperature.

The flow pipe 420 is formed in a cylindrical shape to receive the heat dissipating rod 410 therein. The flow pipe 420 allows the air discharged from the meat dryer to be reheated through the flow pipe 420. In this case, the air discharged from the meat dryer is heated at a high temperature along the heat dissipating rods 410 inside the flow pipe 420, and the odor is burned.

The inner casing 430 receives the flow pipe 420 therein, and one side thereof is connected to the inner discharge port. In this case, the first connection hole 431 is formed and connected to the inner outlet. The inner casing 430 keeps the heat generated in the heat dissipating rod 410 warm, and prevents the reheated air from flowing out to the outside. One side of the inner casing 430 is open and the other side is closed.

The outer casing 440 receives the inner casing 430 therein, and one side of the inner casing 430 is connected to the inner suction port of the meat dryer. In this case, the second connection hole 441 is formed and connected to the inner suction port of the meat dryer. The outer casing 440 heats the heat generated by the heat dissipating rod 410 and prevents the reheated air from flowing out to the outside. One side of the outer casing 440 is open and the other side is closed. As the inner casing 430 is inserted into the outer casing 440, the open surfaces other than the first connection hole 431 and the second connection hole 441 are closed.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, Therefore, the present invention should be construed as a description of the claims which are intended to cover obvious variations that can be derived from the described embodiments.

10: Meat dryer
11: Storage room
100: Control device
110:
120:
121: Gas sensing unit
122:
123:
130:
140: Heat exchanger
150: Heat source generating unit
160:
170:
180: Pollution degree detector
190: Deodorization
310:
311: Inner inlet
312: Outside inlet
330:
340: Heat exchanger
341: separation plate
350: Heat source generating unit
351: Evaporator
352: condenser
360:
361: Internal outlet
362: Outside outlet
400: odor elimination
410: heat sink
420: a flow pipe
430: inner casing
431: first connection hole
440: outer casing
441: Second connection hole

Claims (5)

A suction unit for sucking air into a storage chamber for storing the meat dry matter through an internal suction port or an external suction port;
A sensing unit for sensing environmental information including temperature, humidity, wind speed of the inside and outside of the storage room, and weight of the meat drier;
A heat exchange unit for exchanging heat between the indoor air sucked through the inner air inlet and the outdoor air drawn through the outer air inlet according to predetermined drying conditions and the environmental information;
A heat source generating unit for controlling the amount of heat generated by controlling the flow rate of the refrigerant and the amount of fan blowing in the evaporator and the condenser according to the drying condition and the environmental information;
An air moving unit which converts the flow of the indoor air and the outdoor air according to the drying condition and the environmental information and moves the indoor air or outdoor air to a path connected to the evaporator or the condenser of the heat source generating unit;
A discharge unit for discharging air through an internal discharge port or an external discharge port in cooperation with the air suction unit according to the internal environment information;
And a controller for controlling the suction unit, the air moving unit, the heat exchanging unit, the heat source generating unit, the discharging unit, and the sensing unit according to the drying condition, And controlling the movement path of the inside air and the outside air by selecting any one of the mode and the mode. The method according to claim 1,
Wherein,
Wherein the drying condition is selected and controlled so that a temperature inside the storage chamber is maintained at 1 to 4 DEG C, a humidity is maintained at 60 to 85%, and a wind speed is maintained at 0.5 to 2 m / s. The method according to claim 1,
Further comprising a pollution degree detecting unit for analyzing the weather forecast of the predetermined range and determining whether the average air pollution degree of the outside air exceeds a preset reference pollution degree,
Wherein when the average air pollution degree exceeds the reference pollution degree, the control unit switches the inside air from the air moving unit to a first path connected to the evaporator, and switches the outside air to a second path connected to the condenser, The heat exchanging unit opens the bypass path to shut off the heat exchange between the inside air and the outside air, so that the internal exhaust port is connected to the third path connected to the evaporator, and the external exhaust port is connected to the fourth Thereby preventing the inflow of outside air. The method according to claim 1,
The sensing unit includes:
A gas sensing part for electrochemically reacting with the gas generated from the meat drier to sense the gas, a gas classifying part for classifying the components of the sensed gas by using a statistical learning algorithm, And an aging degree judging unit for judging the aging degree of the meat dry matter by comparing the proportion of constituent components with a preset reference constituent ratio,
Wherein,
And controlling the drying condition to be changed according to the degree of aging of the meat dry matter. The method according to claim 1,
Further comprising an odor eliminating unit for heating and burning the air discharged from the internal discharge port and injecting the heated air through the internal air inlet.

Images