KR100693479B1 - Steam convection oven - Google Patents

Abstract

A steam convection oven is provided to maintain the internal pressure at a constant level by quickly discharging the excessive pressure generated when steam or water is injected in a cooking chamber or a drain pipe is clogged. A steam convection oven comprises a cooking chamber(1) in which a ventilation fan(10) and a heater(15) are arranged; a steam generator(50) for injecting steam in the cooking chamber; and a drain pipe(40) for draining vapor from the cooking chamber. A pressure discharge port is formed on the cooking chamber so as to discharge excessive pressure from the cooking chamber. A pressure regulating unit(30) is arranged on the pressure discharge port so that the pressure regulating unit is opened/closed by the excessive pressure.

Description

Steam convection oven}

1 is a schematic view of a steam convection oven of the present invention;

Figure 2 is an exploded perspective view showing a pressure regulating device of the steam convection oven of the present invention,

3 is a cross-sectional view showing a state in which the pressure regulator of Figure 2 is opened by the pressure inside the cooking chamber,

Figure 4a is a graph showing the relationship between the time and temperature inside the cooking chamber of the present invention,

Figure 4b is a graph showing the relationship between the time and pressure inside the cooking chamber of the present invention,

Figure 4c is a graph showing the pressure change inside the steam spray inside the cooking chamber of the present invention,

Figure 4d is a graph showing the pressure change inside the cooking chamber when the drain pipe of the present invention is blocked.

Explanation of symbols on the main parts of the drawings

1: cooking chamber 5: door

10: ventilation fan 15: heater

20: steam outlet 30: pressure regulating device

31 Pressure outlet 32 Ring packing

35: safety support frame 37: spring support bar

38: steam discharge hole 39: opening and closing plate

39a: guide bar 40: drain pipe

45: air discharge pipe 50: steam generator

55: steam supply pipe 60: water supply pipe

65: water supply device 70: spring

The present invention relates to a steam convection oven in which a steam generator is installed, and an internal pressure generated by an instantaneous internal pressure increase generated when steam is injected into the cooking chamber by installing a pressure regulator on the upper side of the cooking chamber or by clogging the drain pipe. The present invention relates to a steam convection oven capable of quickly discharging overpressure due to an increase, thereby preventing internal steam from being discharged to the outside through a gasket installed in a door due to overpressure.

In general, the steam convection oven allows steam to be cooked under the optimum temperature and humidity conditions by injecting steam into the cooking chamber. When cooking in the steam mode, the steam generator injects steam into the cooking chamber. Cooking is possible under conditions of humidity.

However, the steam convection oven of the above structure had the following problems.

When switching from convection mode to steam mode, when steam is injected into the cooking chamber or water is sprayed manually to lower the temperature inside the cooking chamber, an increase in concentration due to the diffusion of water molecules causes an instantaneous pressure increase inside the cooking chamber. As the internal pressure increases due to overpressure or clogged drain pipe, the internal steam is rapidly leaked between the gasket and glass of the door due to the increased pressure, causing discomfort to the user or a safety accident. .

The present invention has been made to solve the above problems, by installing a pressure regulator on the upper side of the cooking chamber of the steam convection oven, the instantaneous internal pressure rise or steam generated when the steam is injected into the cooking chamber is blocked. By allowing the overpressure generated by the internal pressure to rise quickly and automatically, the pressure inside the cooking chamber is maintained at the proper level for the best cooking, and the user feels uncomfortable by the high temperature steam leakage. In addition to preventing the accident, it is to provide a steam convection oven that can prevent safety accidents in advance.

In order to achieve the above object, the present invention includes a cooking chamber having a fan and a heater installed at one side thereof, a steam generator installed to inject steam into the cooking chamber, and a drain pipe for discharging water vapor inside the cooking chamber to the outside. In the steam convection oven,

In the upper side of the cooking chamber,

A pressure discharge port is formed to penetrate the overpressure generated inside the cooking chamber to be discharged to the outside, and a pressure control device is provided at an upper side of the pressure discharge port to open and close the pressure.

The pressure regulating device of the present invention is coupled to the upper side of the pressure discharge port, the upper side surface is formed in the inclined surface on the lower side so as to be installed in close contact with the upper inclined surface of the ring packing and the inclined downward surface. The frame includes a safety support frame having a plurality of vertically penetrating slide holes and a guide bar inserted into the slide hole, the opening and closing plate formed at a lower side thereof.

In addition, the ring packing, the support bar is provided in a diagonal direction in the center portion, and further provided with a spring coupled to both ends of the lower center portion and the support bar of the opening and closing plate can smoothly move up and down the opening and closing plate.

Hereinafter, the present invention will be described in detail with reference to the accompanying drawings.

Figure 1 shows the overall schematic of the steam convection oven of the present invention.

As shown, the steam convection oven according to the present invention includes a cooking chamber 1 provided with a ventilation fan 10 and a heater 15, a steam generator 50 capable of supplying steam to the cooking chamber 1, and a cooking chamber ( 1) It is composed of a water supply pipe (60) and a drain pipe (40) installed below the cooking chamber (1) installed to supply water if necessary inside, the steam outlet (20) and the pressure control device in the upper portion of the cooking chamber (1) 30 is provided.

On the other hand, the cooking chamber (1) is installed in the front door so that the door can be opened and closed, in the center of the rear portion inside the cooking chamber (1) with the separator 12, the ventilation fan 10 is installed, and the upper side of the ventilation fan (10) and The heater 15 is installed in the lower side.

In addition, the upper portion of the cooking chamber (1) is provided with a steam discharge port 20 for manually discharging the internal water vapor, if necessary, the upper portion in which the heater 15 is installed to discharge the overpressure generated inside the internal pressure A pressure regulating device 30 that can adjust is laid.

The steam generator 50 is a device capable of supplying steam 56 to the inside of the cooking chamber 1, which is installed outside the cooking chamber 1, and is connected to the rear side of the cooking chamber 1 through the steam supply pipe 55 connected to the cooking chamber 1. Steam 56 is supplied to the inside.

Meanwhile, a water supply pipe 53 connected to the water supply device 65 is installed at the lower portion of the steam generator 50 so as to supply water therein, and a drain pipe 52 is connected to drain the water therein. , The other end of the drain pipe 52 is connected to the air discharge pipe (45).

In addition, the water supply pipe 60 connected to the water supply device 65 is connected to the rear of the cooking chamber 1 so that the water can be sprayed when necessary to lower the temperature when the internal temperature is overheated.

The drain pipe 40 installed at the bottom of the cooking chamber 1 discharges water that collects at the bottom of the inside, and the air discharged together with the water is discharged to the outside through the air discharge pipe 45 connected to the drain pipe 40. .

Hereinafter, the operation of the steam convection oven will be described.

First, in the convection mode, the heater 15 inside the cooking chamber 1 is heated, and at the same time, the ventilation fan 10 is operated so that the air passes through the ventilation fan 10 from the inside of the cooking chamber 1, and then the cooking chamber 1 The food is cooked while circulating through the cooking chamber 1 through the upper and lower sides of the separator 12 and passing through the heaters at the upper and lower sides of the rear surface.

In the steam mode, the steam generator 50 supplies the steam 56 into the cooking chamber 1 through the steam supply pipe 55 to be cooked while maintaining a constant humidity.

On the other hand, the water supply device 65 supplies water to the inside of the cooking chamber 1 through the water supply pipe 60, or in order to lower the temperature when an overshoot (temperature rise) occurs in the temperature inside the cooking chamber 1. It will serve to supply.

The steam outlet 20 provided at the upper side of the cooking chamber 1 can manually discharge steam inside the cooking chamber 1 when necessary.

In addition, the pressure regulating device 30 attached to the upper side of the cooking chamber 1 is a momentary pressure increase that occurs when steam is injected into the cooking chamber 1 when the convection mode is switched to the steam mode, or the cooking chamber 1. Rapidly discharge the overpressure due to the instantaneous pressure increase that occurs when water is supplied through the water supply pipe 60 in order to lower the temperature when the internal temperature rises or the overshoot occurs in the internal temperature. Let's go.

In addition, when the drain pipe 40 installed in the cooking chamber 1 is blocked, the overpressure generated by the internal pressure increases to quickly discharge to the outside.

The increased pressure inside the cooking chamber 1 pushes the opening / closing plate 39 attached to the pressure regulator 30 and is discharged to the outside.

Therefore, the pressure inside the cooking chamber 1 can be optimally maintained.

Figure 2 shows an exploded perspective view of the pressure regulator 30 of the present invention, Figure 3 shows the state in which the pressure regulator of Figure 2 is opened by the overpressure inside the cooking chamber in a state coupled to the pressure outlet.

As shown in Figure 2, the pressure control device 30 is installed on the upper side of the cooking chamber 1 of the steam convection oven of the present invention is the upper edge of the pressure outlet 31 formed to protrude upward to the outside of the cooking chamber (1). Ring packing 32 is coupled to the, and is configured to include a safety support frame 35 is installed on top of the ring packing 32 and the opening and closing plate (39) coupled to the safety support frame (35).

The ring packing 32 is a ring shape having an empty center, and the upper portion forms a downward sloped surface from the outer circumference to the center direction.

In addition, the insertion groove (32a) is formed in the lower edge of the rim is fitted into the upper edge of the pressure discharge port 31 formed to protrude upward in the cooking chamber (1), the support bar 37 is installed diagonally in the center do.

The ring packing 32 is preferably made of a material having elasticity, such as rubber.

On the other hand, the safety support frame 35 is a ring-shaped ring formed with a constant thickness rim formed with a steam discharge hole 38 in the center, the inclined surface is formed in the lower portion in the downward direction from the outer circumference to the ring packing ( 32) It is installed in close contact with the inclined surface of the upper part.

In addition, a plurality of slide holes 35a vertically penetrating in the up and down direction are formed at the edge of the safety support frame 35, and a cut portion 35b having a predetermined depth is formed along the edge at the edge upper surface.

Meanwhile, the opening and closing plate 39 forms an outer circumferential surface corresponding to the cutout portion 35b of the upper portion of the safety support frame 35, and a plurality of slide holes 35a formed in the safety support frame 35 at the lower side thereof. A plurality of guide bars 39a are formed at positions corresponding to the plurality of guide bars 39a.

Therefore, the guide bar 39a formed at the lower side of the opening and closing plate 39 is inserted into and coupled to the slide hole 35a of the safety support frame 35.

When the guide bar 39a is completely inserted into the slide hole 35a, the lower side of the opening and closing plate 39 is seated at the cutout part 35b of the safety support frame 35 to close the steam discharge hole 38.

On the other hand, the opening and closing plate 39 can be elevated in the up and down direction, and the spring 70 is provided between the lower side and the support bar 37 of the ring packing 32, the lifting and lowering of the opening and closing plate 39 more smoothly can do.

Hereinafter, the operation of the pressure regulator 30 will be described.

The pressure regulating device 30 serves to quickly discharge the increased pressure to the outside when the pressure inside the cooking chamber 1 abnormally rises. When the pressure inside the cooking chamber 1 rises as follows.

First, when the steam convection oven is operated in the convection mode, the ventilation fan 10 and the heater 15 are operated to cook while air is circulated inside the cooking chamber 1.

At this time, it is necessary to supply water to the inside of the cooking chamber 1, or when the temperature inside the cooking chamber 1 (overshoot) to increase the water supply pipe (60) connected to the water supply device (65) in order to lower the temperature. The water is sprayed into the cooking chamber 1 through, and at this time, the pressure inside the cooking chamber 1 is suddenly increased by supply of moisture.

Another cause of the sudden increase in the internal pressure is the steam generator 50 supplies the steam 56 into the cooking chamber 1 through the steam supply pipe 55 when switching from the convection mode to the steam mode. When the steam 56 is injected into the inside, the internal pressure is rapidly increased, as when the water is injected.

In addition, even when the drain pipe 40 of the cooking chamber 1 is clogged, the internal pressure rapidly rises.

Therefore, when the internal pressure rises as described above, the increased pressure presses the lower side of the opening and closing plate 39 of the pressure regulating device 30 through the pressure outlet 31, and the opening and closing plate 39 is the pressure. As it rises upwards by the pressure regulator 30 is opened, the pressure inside is discharged to the outside.

On the other hand, the opening and closing plate 39 is closed by the elastic force of the spring 70 when the internal pressure of the cooking chamber is equal to the atmospheric pressure.

Therefore, the pressure inside the cooking chamber 1 is maintained at the same level as the atmospheric pressure.

4A is a graph showing a relationship between time and temperature in the cooking chamber 1 of the steam convection oven of the present invention.

As shown in the drawing, when the temperature inside the cooking chamber 1 reaches a set temperature of 200 ° C., the temperature rises in an initial gentle slope as time passes, and then reaches a set temperature after a predetermined time.

4B is a graph showing a change in the internal pressure with time inside the cooking chamber 1.

As shown, the internal pressure of the cooking chamber 1 is in a state of communicating with the outside through the drain pipe 40, and maintains a state such as atmospheric pressure regardless of the passage of time.

FIG. 4C is a graph showing that the pressure inside the cooking chamber 1 is instantaneously changed due to an overshoot.

As shown, when the pressure inside the cooking chamber 1 is sprayed into the cooking chamber 1 at a certain point as indicated on the horizontal axis while the atmospheric pressure is kept constant, the pressure inside the water molecule Instantaneous overshoot occurs.

Therefore, the pressure regulating device 30 is opened by the opening and closing plate 39 is pushed by the increased pressure when the pressure rises to the overshoot as described above, when the internal pressure is equal to the atmospheric pressure again, the elastic force of the spring 70 It will be blocked by.

4D shows the internal pressure increase of the cooking chamber 1 when the drain pipe 40 installed below the cooking chamber 1 is blocked.

As shown, the internal pressure of the cooking chamber 1 rises rapidly in a state in which the cooking chamber 1 is kept in an airtight state when the drainage pipe 40 is clogged.

Therefore, the overpressure formed inside the cooking chamber 1 is to be discharged to the outside by opening the pressure regulating device 30 by pushing the opening and closing plate 39 of the pressure regulating device 30 upward.

As described above, the above embodiments are merely described as examples for convenience of description and are not intended to limit the scope of the claims.

As described above, the internal pressure is kept constant at atmospheric pressure by quickly discharging the overpressure due to the instantaneous pressure increase caused by the injection of steam or water into the cooking chamber or the clogging of the drain pipe to the outside. By making it possible to know whether it is clogged, it enables the best cooking by the proper pressure and also prevents the internal steam from being rapidly discharged to the outside through the gap of the door by overpressure, thereby preventing discomfort to the user. In addition, there is an effect that can prevent in advance a safety accident due to high temperature steam discharge.

Claims (3)

The cooking chamber 1 provided with the ventilation fan 10 and the heater 15 at one side of the inside, and the steam generator 50 and the steam inside the cooking chamber 1 installed to inject steam into the cooking chamber 1 In the steam convection oven configured to include a drain pipe 40 discharged to the outside, On the upper side of the cooking chamber 1, A pressure discharge port 31 is formed to penetrate the overpressure generated inside the cooking chamber 1 to be discharged to the outside. Steam convection oven, characterized in that the upper portion of the pressure outlet 31 is provided with a pressure regulator 30 that can be opened and closed by the overpressure. The method of claim 1, The pressure regulator 30, A ring packing (32) coupled to an upper side of the pressure discharge port (31), the upper side of which forms a downward inclined surface inward; A safety support frame 35 having an inclined surface formed on a lower side thereof to be installed in close contact with an upper inclined surface of the ring packing 32, and having a plurality of slide holes 35a vertically penetrated at an edge thereof; And An opening and closing plate 39 formed at a lower portion of the guide bar 39a inserted into the slide hole 35a; Steam convection oven, characterized in that configured to include. The method of claim 2, In the ring packing 32, The support bar 37 is installed diagonally in the center, Steam convection oven, characterized in that the support bar 37 and the spring 70 is further provided with both ends coupled to the lower central portion of the opening and closing plate (39).

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