CN218442221U - Evaporator and steaming and baking box - Google Patents

Abstract

The utility model provides an evaporimeter and steaming and baking oven belongs to kitchen electricity technical field. The evaporator includes an evaporator body and a liquid level balancer. The evaporator body includes an evaporator base, first and second heating elements. The evaporator base divides the inner cavity into a first heating area and a second heating area through a middle clapboard. The liquid level balancer is used to maintain the water level in the evaporator body at a set height. The steam is generated by the first heating element of the first heating zone and heated by the second heating element of the second heating zone, thereby improving the quality of the steam. The performance of the evaporator is improved to be more than 96 percent, the steam temperature is more than 150 ℃, the steam dryness is more than 96 percent, the cooking time is further shortened, the water content is improved, the hardness of the food materials is reduced, the chewiness is improved, and more nutritional ingredients are reserved. The liquid level balancer is arranged outside the evaporator seat, so that the failure problem caused by scaling of the water level probe is effectively avoided, and the reliability of the water level probe is improved.

Description

Evaporator and steaming and baking box

Technical Field

The utility model relates to a kitchen electricity technical field, in particular to evaporimeter and steaming and baking oven.

Background

The steaming and baking box is a kitchen appliance integrating a steaming box and a baking box. Commercial steam ovens generally comprise: cavity, evaporimeter, water pump and water tank. The following description will be given by taking a direct injection steam generation steam oven as an example:

this steaming and baking oven passes through the water pump and leads the water of water tank to the evaporimeter, and heating element in the evaporimeter boils the water of evaporimeter to vapor, sprays vapor to steaming and baking oven's cavity through the water pipe, makes the cavity produce a large amount of high temperature steam in the twinkling of an eye to culinary art food.

Because the efficiency of the steaming and baking oven is generally less than 90 percent, the steam temperature is 97-98 ℃, and the steam dryness is less than 90 percent. Therefore, the problems of long cooking time, low moisture content of the food material, high hardness, poor chewiness and high loss of nutrient components exist.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide an evaporator, this evaporator performance promote to efficiency > 96%, and steam temperature > 150 ℃, and steam dryness is > 96%, and then shortens the culinary art time, improves the moisture content, reduces and eats material hardness, promotes the chewiness to remain more nutrient composition.

The utility model aims at providing a still provide a evaporate oven.

For realizing the purpose of the utility model, the utility model adopts the following technical proposal:

according to an aspect of the present invention, there is provided an evaporator, comprising:

an evaporator body comprising:

the evaporator seat is a shell with an evaporator cavity inside, a middle clapboard is arranged in the evaporator cavity to divide the evaporator cavity into a first heating area and a second heating area, a through hole is arranged in the middle clapboard to communicate the two heating areas, a water inlet is arranged in the first heating area and used for water inlet,

a first heating element installed in the first heating zone for heating water in the first heating zone to generate steam,

the second heating element is arranged in the second heating area and used for heating the steam so as to improve the quality of the steam; and

and the liquid level balancer is arranged outside the evaporator main body and is connected with the water inlet of the evaporator seat through a pipeline to supply water for the first heating area, and the liquid level balancer keeps the water level in the evaporator main body at a set height.

According to the utility model discloses an embodiment, wherein, the liquid level balancer includes:

the balancer base is a shell with a balancer cavity inside and an opening at one end, a water outlet hole is formed in the balancer base, and the water outlet hole is connected with a water inlet of the evaporator base through a pipeline; and

the balancer cover plate is used for covering the opening of the balancer seat, an atmosphere connecting hole and a water inlet hole are formed in the balancer cover plate, the atmosphere connecting hole is used for being communicated with the atmosphere, and the water inlet hole is used for water inlet; and

and the water level probe penetrates through the balancer cover plate and extends into the balancer seat.

According to the utility model discloses an embodiment, wherein, be equipped with the division board in the balancer seat, in order with the balancer cavity divide into cold district and the hot district that communicates each other, the water level probe sets up in the region that the cold district corresponds, the hot district is equipped with the apopore for connect the water inlet of the first zone of heating.

According to the utility model discloses an embodiment, wherein, the water level probe includes two long probes and a short probe, one of them long probe is used for ground connection, another long probe is used for detecting the low water level, short probe is used for detecting the high water level. The water level probe comprises two long probes and a short probe, one long probe of the two long probes is used for grounding, the other long probe of the two long probes is used for detecting a low water level, and the short probe of the two long probes is used for detecting a high water level.

According to the utility model discloses an embodiment, wherein, the evaporimeter is still including setting up be used for increasing in the first zone of heating a plurality of first ribs, a plurality of the area of contact of evaporimeter main part and water first rib is the law and arranges.

According to the utility model discloses an embodiment, wherein, the evaporimeter is still including setting up a plurality of second ribs of the bottom department of the first zone of heating, a plurality of second ribs are the law and arrange, a plurality of second ribs are used for increasing the area of contact of evaporimeter main part and water and be used for absorbing the incrustation scale.

According to the utility model discloses an embodiment, wherein, the evaporimeter is still including setting up a plurality of third ribs of the second zone of heating, a plurality of third ribs are used for promoting steam with the heat exchange area of evaporimeter main part.

According to the utility model discloses an embodiment, wherein, a plurality of third ribs with the airflow channel that the second zone of heating is constituteed can increase steam channel route.

According to the utility model discloses an embodiment, wherein, arbitrary adjacent two the third rib staggered arrangement, one of them third rib is fixed the top of the second zone of heating just the free end of third rib with have the space between the median septum, another third rib is fixed on the median septum just the free end of third rib with have the space between the top of the second zone of heating, it is a plurality of the third rib with the airflow channel that the second zone of heating is constituteed is the wave.

According to the utility model discloses an embodiment, wherein, each the link of third rib is equipped with anti-turbulence R angle.

According to the utility model discloses an embodiment, wherein, the evaporimeter still include evaporimeter temperature sensor, install the second zone of heating for detect the temperature of the second zone of heating and control the heating temperature of second heating element.

According to the utility model discloses an embodiment, wherein, the evaporimeter still include a steam outlet, form the second zone of heating for steam flows out, the cross-sectional area A of through-hole, go out the cross-sectional area B of steam outlet, wherein, A: b is more than or equal to 1.2.

According to an embodiment of the present invention, wherein the cross-sectional area of the water inlet (115) is C, wherein B: c is more than or equal to 1.8.

According to the utility model discloses an embodiment, wherein, the evaporimeter still include the protruding temperature controller of jumping, install second zone of heating department is used for evaporimeter during abnormal operation cut off power.

According to an aspect of the present invention, there is provided a steaming oven including the above-mentioned evaporator.

The utility model provides an embodiment has following advantage or beneficial effect:

the utility model discloses an evaporimeter includes evaporimeter main part and liquid level balancing ware, and the evaporimeter body includes evaporimeter seat, first heating element and second heating element. The evaporator base divides the inner cavity into a first heating area and a second heating area through a middle clapboard. The liquid level balancer is used to maintain the water level in the evaporator body at a set height. The steam is generated by a first heating element installed in the first heating zone and heated by a second heating element installed in the second heating zone, thereby improving the quality of the steam. The performance of the evaporator is improved to more than 96 percent, the steam temperature is more than 150 ℃, and the steam dryness is more than 96 percent, so that the cooking time is shortened, the water content is improved, the hardness of the food material is reduced, the chewiness is improved, and more nutrient components are reserved.

Further, the utility model discloses a set up the liquid level balancer outside the evaporator seat, effectively avoided the inefficacy problem that the scale deposit of water level probe leads to, improved water level probe's reliability.

Drawings

The above and other features and advantages of the present invention will become more apparent by describing in detail exemplary embodiments thereof with reference to the attached drawings.

FIG. 1 is a schematic block diagram of an evaporator shown in accordance with an exemplary embodiment;

FIG. 2 is an exploded view of the schematic parts of the evaporator body shown in FIG. 1;

FIG. 3 is a schematic perspective view of the evaporator mount of FIG. 1;

FIG. 4 is an exploded view of the schematic components of the liquid level balancer shown in FIG. 1;

fig. 5 is a schematic top view of the balancer housing shown in fig. 4.

Wherein the reference numerals are as follows:

1, an evaporator is arranged in the evaporator,

10 the main body of the evaporator is provided with a plurality of evaporator bodies,

11 evaporator base, 111 middle partition plate, 112 through hole, 113 first heating zone, 114 second heating zone, 115 water inlet, 116 first rib, 117 second rib, 118 third rib, 119 evaporator temperature sensor, 120 steam outlet, 121 convex jump temperature controller,

12 a first heating element for heating the substrate,

13 a second heating element for heating the substrate,

14 a sealing ring is arranged on the inner side of the shell,

15 the cover of the evaporator is covered with a cover,

20 a liquid level balancer is arranged on the upper portion of the water tank,

a 21 water level probe, a 211 first probe, a 212 second probe, a 213 third probe,

22 balancer base, 221 water outlet, 222 partition board, 223 cold area, 224 hot area,

23 balancer cover plate, 231 is connected with atmosphere hole, 232 water inlet hole.

Detailed Description

Example embodiments will now be described more fully with reference to the accompanying drawings. Example embodiments may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein; rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the concept of example embodiments to those skilled in the art. The same reference numerals in the drawings denote the same or similar structures, and thus their detailed description will be omitted.

The terms "a," "an," "the," "said" are used to indicate the presence of one or more elements/components/etc.; the terms "comprising" and "having" are intended to be inclusive and mean that there may be additional elements/components/etc. other than the listed elements/components/etc.

As shown in fig. 1-5, fig. 1 is a schematic block diagram of an evaporator shown according to an exemplary embodiment. Fig. 2 is an exploded view of the schematic parts of the evaporator body shown in fig. 1. Fig. 3 is a schematic perspective view of the evaporator mount shown in fig. 1. Fig. 4 is an exploded view of the schematic components of the liquid level balancer shown in fig. 1. Fig. 5 is a schematic top view of the balancer housing shown in fig. 4.

As shown in fig. 1, and also referring to fig. 2-5, the evaporator 1 of the embodiment of the present invention may generally include: an evaporator main body 10 and a liquid level balancer 20. The evaporator body 10 may generally include an evaporator base 11, a first heating element 12, and a second heating element 13. The evaporator mount 11 is a housing having an evaporator cavity therein. A central partition 111 is provided in the evaporator cavity to divide the evaporator cavity into a first heating zone 113 and a second heating zone 114. In this embodiment, the middle partition 111 divides the evaporator cavity into two heating zones arranged up and down, the first heating zone 113 being located at the lower part and the second heating zone 114 being located at the upper part. The middle partition 111 is provided therein with a through hole 112 to communicate the first heating zone 113 and the second heating zone 114. The first heating zone 113 is provided with a water inlet 115 (see fig. 3) for inlet of water. The first heating element 12 is installed in the first heating zone 113 for heating water in the first heating zone 113 to generate steam. The second heating element 13 is installed in the second heating zone 114 for heating the steam to improve the quality of the steam. Specifically, the first heating element 12 and the second heating element 13 may be heating pipes. The liquid level balancer 20 is disposed outside the evaporator main body 10 and is connected to the water inlet 115 of the evaporator base 11 through a pipe to supply water to the first heating zone 113, and is used to maintain the water level inside the evaporator main body 10 at a set height. Since the liquid level balancer 20 forms a communication with the first heating zone 113 of the evaporator base 11, the water level of the first heating zone 113 is maintained at a set height by the liquid level balancer 20.

In a specific implementation, as shown in fig. 2, the evaporator body 10 further includes an evaporator cover 15 and a sealing ring 14 disposed between the evaporator base 11 and the evaporator cover 15.

As shown in fig. 1, the evaporator 1 of the present invention generates steam by a first heating element 12 installed in a first heating zone 113, and heats the steam by a second heating element installed in a second heating zone, thereby improving the quality of the steam. The performance of the evaporator 1 is improved to more than 96 percent, the steam temperature is more than 150 ℃, the steam dryness is more than 96 percent, further the cooking time is shortened, the water content is improved, the hardness of the food material is reduced, the chewiness is improved, and more nutrient components are reserved.

Further, as shown in fig. 1, the evaporator 1 of the present invention effectively avoids the failure problem caused by scaling of the water level probe 21 by disposing the liquid level balancer 20 outside the evaporator base 11, thereby improving the reliability of the water level probe 21.

Furthermore, compared with the evaporator in the prior art, the water inlet is judged by dry burning. As shown in fig. 1, the evaporator 1 of the present invention keeps the water in the first heating zone 113 of the evaporator 1 at a predetermined height through the liquid level balancer 20, so as to effectively avoid dry burning, thereby improving the efficiency of the first heating zone 113 of the evaporator 1.

Compared with the prior art, the steam of the evaporator has a large amount of water, so that water is accumulated in the steam oven, and the steam oven needs to be cleaned frequently by a user. As shown in fig. 1, the utility model discloses an evaporimeter 1 heats steam through second heating element 13 of second zone of heating 114, has effectively improved the dryness fraction of steam for moisture in the steam reduces, and then reduces the steaming oven ponding, shortens the clean time of steaming the oven of user, promotes user experience and feels.

In a preferred embodiment of the present invention, as shown in fig. 4, the liquid level balancer 20 further includes: a balancer seat 22, a balancer cover plate 23, and a water level probe 21. The balancer seat 22 is a housing having a balancer cavity therein and an opening at one end. The balancer seat 22 is provided with a water outlet hole 221, and the water outlet hole 221 is connected with the water inlet 115 of the evaporator seat 11 through a pipeline. The balancer cover plate 23 is used for covering the opening of the balancer base 22, and the balancer cover plate 23 is provided with an air connecting hole 231 and a water inlet hole 232. The atmosphere connecting hole 231 is used for connecting the atmosphere, and the pressure in the liquid level balancer 20 is ensured to be the same as the atmosphere. The inlet 232 is for water intake. The water level probe 21 passes through the balancer cover plate 23 and protrudes into the balancer base 22.

In a preferred embodiment of the present invention, as shown in fig. 5 and also see fig. 4, a partition plate 222 is disposed in the balancer seat 22 to divide the balancer cavity into a cold area 223 and a hot area 224 which are communicated with each other, and the water level probe 21 is disposed in an area corresponding to the cold area 223, so as to further avoid scale formation of the probe due to an excessively high water temperature at the position of the water level probe 21. The hot zone 224 is provided with a water outlet 221 for connection to the water inlet 115 of the first heating zone 113.

In a preferred embodiment of the present invention, as shown in fig. 4, the water level probe 21 comprises two long probes and one short probe. One of the two long probes is used for grounding, and the other long probe is used for detecting a low water level. A short probe is used to detect high water levels. Specifically, in the present embodiment, the water level probe 21 includes a first probe 211, a second probe 212, and a third probe 213. The first probe 211 is a long probe for detecting a low water level. The second probe 212 is a long probe for grounding. The third probe 213 is a short probe for detecting a high water level. The water level can be controlled between high and low water levels by the detection of the first probe 211 and the second probe 212.

In a preferred embodiment of the present invention, as shown in fig. 1, the evaporator 1 further includes a plurality of first ribs 116 provided in the first heating zone 113 for increasing a contact area of the evaporator main body 10 and water, thereby improving efficiency of the first heating zone 113 of the evaporator 1. The plurality of first ribs 116 are regularly arranged, and in specific implementation, the plurality of first ribs 116 may be arranged in an array, such as a rectangular array, or in a circular array. The plurality of first ribs 116 may also be arranged in a regular pattern, such as in a staggered arrangement.

In a preferred embodiment of the present invention, as shown in fig. 1, the evaporator 1 further includes a plurality of second ribs 117 disposed at the bottom of the first heating area 113, the plurality of second ribs 117 are regularly arranged, and the plurality of second ribs 117 are used to increase the contact area between the evaporator main body 10 and water, so as to further improve the efficiency of the first heating area 113. The plurality of second ribs 117 also serve to absorb scale, ensuring the thermal conductivity of the first heating zone 113, thereby ensuring the efficiency of the first heating zone 113.

In particular embodiments, a plurality of first ribs 116 are disposed proximate to first heating element 12. The first rib 116 and the second rib 117 may be a unitary structure, such as the illustrated L-shaped structure.

In a preferred embodiment of the present invention, as shown in fig. 1, and also in fig. 2-3, the evaporator 1 further comprises a plurality of third ribs 118 arranged in the second heating zone 114. The plurality of third ribs 118 serve to increase the heat exchange area of the steam with the evaporator main body 10.

In a preferred embodiment of the present invention, as shown in fig. 1, and also referring to fig. 2-3, the plurality of third ribs 118 are configured to enable the airflow path formed by the plurality of third ribs 118 and the second heating zone 114 to increase the path of the steam path.

In a preferred embodiment of the present invention, as shown in fig. 1, and also referring to fig. 2-3, any adjacent two third ribs 118 of the plurality of third ribs 118 are arranged in a staggered manner. A third rib 118 of any two adjacent third ribs 118 is fixed on top of the second heating area 114, and a gap is formed between the free end of the third rib and the middle partition 111. The other 118 of any two adjacent third ribs 118 is fixed on the middle partition 111, and the free end of the third rib has a gap with the top of the second heating region 114. So that the airflow channel formed by the third ribs 118 and the second heating area 114 is wavy. That is, the third ribs 118 form a wave-shaped airflow channel to increase the path of the steam channel. Thereby increasing the heating time of the vapor in the channel and ensuring that the vapor sufficiently absorbs the energy of the heat source, thereby increasing the efficiency of the second heating zone 114 of the evaporator 1.

In a preferred embodiment of the present invention, as shown in fig. 1, the connecting end of each third rib 118 is provided with an anti-turbulence R angle. The anti-turbulence angle R is to reduce the generation of small turbulence in the "wave" channel of the steam, thereby reducing the loss of kinetic energy of the steam during the flowing process and ensuring the kinetic energy of the steam at the steam outlet 120.

In a preferred embodiment of the present invention, as shown in fig. 1, the evaporator 1 further comprises a steam outlet 120 formed in the second heating zone 114 for steam to flow out. The evaporator 11 further comprises an evaporator temperature sensor 119, installed in the second heating zone 114, for detecting the temperature of the second heating zone 114, so as to control the heating temperature of the second heating element 13, thereby controlling the temperature of the steam at the steam outlet 120, and avoiding that the temperature at the steam outlet 120 is too low or too high, thereby effectively controlling the efficiency of the heat source of the second heating zone 114. The evaporator temperature sensor 119 also serves to protect the evaporator 1 from melting failure of the evaporator 1 due to an excessively high temperature of the second heating zone 114. In particular implementations, the evaporator temperature sensor 119 may be an NTC sensor.

In a preferred embodiment of the present invention, the cross-sectional area of the through hole 112 is a, and the cross-sectional area of the steam outlet 120 is B. Wherein, A: b is more than or equal to 1.2. More specifically, in this example, it is preferable that the through hole 112 is provided on the left side and the steam outlet 120 is provided on the right side, whereby the heating path of the steam can be lengthened to ensure that the steam can be sufficiently heated.

In a preferred embodiment of the present invention, as shown in fig. 1, the cross-sectional area of the water inlet 115 is C, and to ensure that the steam outlet pressure is close to atmospheric pressure, B: c is more than or equal to 1.8.

More specifically, in this example, the number of the steam outlets 120 is preferably two, and the steam outlets are arranged at 90 degrees.

In a preferred embodiment of the present invention, as shown in fig. 1, the evaporator 1 further includes a trip temperature controller 121 installed at the second heating zone 114 for cutting off power when the evaporator is abnormally operated.

Referring to fig. 1 to 5, another embodiment of the present invention provides a steaming oven including the evaporator 1 described above.

In the embodiments of the present invention, the term "plurality" means two or more unless explicitly defined otherwise. The terms "mounted," "connected," "fixed," and the like are to be construed broadly and include, for example, fixed connections, removable connections, or integral connections. The specific meaning of the above terms in the embodiments of the present invention can be understood by those skilled in the art according to specific situations.

In the description of the embodiments of the present invention, it should be understood that the terms "upper" and "lower" are used for indicating the position or the positional relationship based on the position or the positional relationship shown in the drawings, and are only for convenience of describing the embodiments of the present invention and simplifying the description, but not for indicating or implying that the indicated device or unit must have a specific direction, be constructed and operated in a specific position, and thus, should not be construed as limiting the embodiments of the present invention.

In the description herein, the description of the terms "one embodiment," "a preferred embodiment," etc. means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the embodiments of the invention. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

The above description is only a preferred embodiment of the present invention, and is not intended to limit the present invention, and various modifications and changes may be made to the embodiment of the present invention by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the embodiments of the present invention should be included in the protection scope of the embodiments of the present invention.

Claims (14)

1. An evaporator, comprising:

evaporator body (10) comprising:

the evaporator base (11) is a shell with an evaporator cavity inside, a middle clapboard (111) is arranged in the evaporator cavity to divide the evaporator cavity into a first heating area (113) and a second heating area (114), a through hole (112) is arranged in the middle clapboard (111) to communicate the two heating areas, a water inlet (115) is arranged in the first heating area (113) and used for water inlet,

a first heating element (12) mounted in the first heating zone (113) for heating water in the first heating zone (113) to generate steam,

a second heating element (13) installed in the second heating zone (114) for heating the steam; and

and the liquid level balancer (20) is arranged outside the evaporator main body (10) and is connected with a water inlet (115) of the evaporator base (11) through a pipeline so as to supply water for the first heating area (113), and the liquid level balancer (20) is used for keeping the water level in the evaporator main body (10) at a set height.

2. An evaporator according to claim 1 wherein the liquid level balancer (20) comprises:

the balancer base (22) is a shell with a balancer cavity inside and an opening at one end, a water outlet hole (221) is formed in the balancer base (22), and the water outlet hole (221) is connected with a water inlet (115) of the evaporator base (11) through a pipeline;

the balancer cover plate (23) is used for covering the opening of the balancer seat (22), an atmosphere connecting hole (231) and a water inlet hole (232) are formed in the balancer cover plate (23), the atmosphere connecting hole (231) is used for being communicated with the atmosphere, and the water inlet hole (232) is used for allowing water to enter; and

a water level probe (21) passing through the balancer cover plate (23) and extending into the balancer seat (22).

3. An evaporator according to claim 2, wherein a partition plate (222) is provided in the balancer housing (22) to divide the balancer cavity into a cold area (223) and a hot area (224) communicating with each other, the water level probe (21) is provided in a region corresponding to the cold area (223), and the hot area (224) is provided with the water outlet hole (221) for connecting with the water inlet (115) of the first heating area (113).

4. An evaporator according to claim 2 wherein the water level probe (21) comprises two long probes and a short probe, wherein one of the long probes is used for grounding, the other of the long probes is used for detecting a low water level, and the short probe is used for detecting a high water level.

5. The evaporator according to claim 1, wherein the evaporator (1) further comprises a plurality of first ribs (116) provided in the first heating zone (113) for increasing a contact area of the evaporator body (10) and water, the plurality of first ribs (116) being regularly arranged.

6. The evaporator according to claim 1, wherein the evaporator (1) further comprises a plurality of third fins (118) provided in the second heating zone (114), the plurality of third fins (118) being for increasing a heat exchange area of the steam with the evaporator body (10).

7. An evaporator according to claim 6 wherein the airflow path of the plurality of third ribs (118) with the second heating region (114) increases the path of the steam path.

8. The evaporator as recited in claim 7, wherein any two adjacent third ribs (118) are arranged in a staggered manner, wherein one third rib (118) is fixed on the top of the second heating zone (114) and a gap is formed between the free end of the third rib (118) and the middle partition (111), and the other third rib (118) is fixed on the middle partition (111) and a gap is formed between the free end of the third rib (118) and the top of the second heating zone (114), so that the airflow channel formed by the plurality of third ribs (118) and the second heating zone (114) is in a wave shape.

9. An evaporator according to claim 6, wherein the connection end of each third rib (118) is provided with an anti-turbulence R-angle.

10. The evaporator according to claim 1, further comprising an evaporator temperature sensor (119) installed at the second heating zone (114) for detecting a temperature of the second heating zone (114) and controlling a heating temperature of the second heating element (13).

11. The evaporator according to claim 1, further comprising a vapor outlet (120) formed in the second heating zone (114) for vapor outflow, the cross-sectional area a of the through-hole (112), and the cross-sectional area B of the vapor outlet (120), wherein a: b is more than or equal to 1.2.

12. An evaporator according to claim 11 wherein the cross-sectional area of the water inlet (115) is C, wherein B: c is more than or equal to 1.8.

13. The evaporator as claimed in any one of claims 1 to 12, further comprising a trip thermostat (121) installed at the second heating region (114) for cutting off power supply when the evaporator is abnormally operated.

14. A steaming oven, characterized in that it comprises an evaporator (1) according to any of claims 1-13.

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