CN219871125U

CN219871125U - Humidity detection device of steaming and baking box

Info

Publication number: CN219871125U
Application number: CN202320476348.2U
Authority: CN
Inventors: 王武刚; 付远华
Original assignee: Ningbo Fotile Kitchen Ware Co Ltd
Current assignee: Ningbo Fotile Kitchen Ware Co Ltd
Priority date: 2023-03-07
Filing date: 2023-03-07
Publication date: 2023-10-20
Anticipated expiration: 2033-03-07

Abstract

The humidity detection device of the steam oven comprises an inner container, an air heater and an exhaust pipe, wherein the air heater and the exhaust pipe are arranged on the wall of the inner container, the temperature sensor of the inner container is used for detecting the internal temperature of the inner container, the detection box is arranged outside the inner container and is provided with a first air inlet, a second air inlet and an exhaust port, the air valve is a one-inlet-two-outlet switching valve, the inlet of the air valve is communicated with the exhaust pipe, the first outlet of the air valve is communicated with the first air inlet, and the second outlet of the air valve is communicated with the second air inlet; the water box is arranged below the detection box; the upper end of the wet bulb thermometer is a temperature sensing head and extends into the detection box, and the lower end of the wet bulb thermometer is immersed into the water box; the dry bulb thermometer is arranged in the detection box; the water level detector is used for detecting the water level of the water box, and the bidirectional water pump pumps water into the water box or pumps water in the water box correspondingly according to the water level detected by the water level detector. The humidity detection device of the steaming and baking oven detects the relative humidity in the inner container through a dry and wet ball method, so that the accurate control of the humidity of the inner container is realized.

Description

Humidity detection device of steaming and baking box

Technical Field

The utility model relates to cooking equipment, in particular to a humidity detection device of an oven.

Background

In the conventional household steam cooking device, such as a steam oven, a steam oven or a steam microwave oven, during the cooking process, steam is continuously input into a cooking cavity or directly heated in the cooking cavity to generate steam, and the humidity in the cooking cavity needs to be maintained within a certain range to ensure the taste of processed food, so that the humidity in the steam cooking device needs to be detected. The steaming oven in the market generally does not control the humidity or is simply and roughly controlled, so that the requirements of cooking on humidity control cannot be met. The utility model discloses a "steam box oven microwave oven all-in-one" as disclosed in application number 201911111601.9 (application publication number CN 112790595A), wherein the hot air circulation system comprises a hot air fan, the exhaust system comprises an exhaust fan, the air volume of the hot air fan is smaller, and the hot air circulation system can realize dehumidification and exhaust air through the exhaust fan, but cannot detect and control the humidity.

In addition, the dry and wet bulb thermometer is usually composed of two identical mercury thermometers, and a thermocouple or a resistance thermometer may be used. One of the two is kept in a dry state and becomes a dry bulb thermometer, and the measured temperature is the dry bulb temperature of the gas. The other is a wet bulb thermometer, the wet package is wrapped with soaked gauze, the gauze is kept in a wet state by a water supply device, and the measured gas temperature is the wet bulb temperature. At the wet bulb temperature, the water in the gauze and the ambient air exchange heat and humidity to finally reach the steady-state temperature. The wet bulb thermometer absorbs heat in the air due to the fact that moisture in the gauze gradually evaporates, therefore the indicated temperature is always lower than that of the dry bulb thermometer, the drier the air is, the faster the moisture in the gauze evaporates, the more air is needed to be heated, the lower the wet bulb temperature is, otherwise, the more air is moist, the slower the moisture in the gauze evaporates, when the air is in a saturated state, the moisture in the gauze cannot evaporate, and at the moment, the wet bulb temperature is equal to the dry bulb temperature. Therefore, the humidity of the air can be calculated according to the temperature difference of the dry-wet bulb thermometer. When humidity is measured by a dry and wet ball method, the following key problems need to be solved: 1. when humidity is measured by a wet-dry bulb method, the smaller the flow speed is, the larger the error is, and the stable flow speed of gas passing through the surface of the wet bulb thermometer is required to be ensured; 2. the use temperature of the dry-wet bulb thermometer is below 100 ℃; 3. when the temperature of the air is low, condensation needs to be reduced as much as possible before the air reaches the dry-wet bulb thermometer, so that the relative humidity actually detected is prevented from deviating from the actual relative humidity in the liner.

Disclosure of Invention

The utility model aims to solve the technical problem of providing a humidity detection device of a steaming oven, which can accurately detect the relative humidity of an inner container of the steaming oven.

The technical scheme adopted for solving the technical problems is as follows: the humidity detection device of the steam oven comprises an inner container, and a hot air blower and an exhaust pipe which are arranged on the wall of the inner container, and is characterized by further comprising:

the inner container temperature sensor is arranged on the inner container wall and used for detecting the inner temperature of the inner container;

a detection box mounted outside the liner, the detection box having a first air inlet, a second air inlet, and an air outlet, a passage between the first air inlet and the air outlet constituting a first air exhaust path, a passage between the second air inlet and the air outlet constituting a second air exhaust path, and the first air exhaust path being longer than the second air exhaust path;

the air valve is a one-in two-out switching valve, an inlet of the air valve is communicated with the exhaust pipe, a first outlet of the air valve is communicated with the first air inlet, and a second outlet of the air valve is communicated with the second air inlet;

the water box is arranged below the detection box;

the upper end of the wet bulb thermometer is a temperature sensing head and extends into the detection box, and the lower end of the wet bulb thermometer is immersed into the water box;

the dry bulb thermometer is arranged inside the detection box;

a water level detector mounted on the water box for detecting the water level of the water box

The bidirectional water pump is arranged outside the water box and is communicated with the water box, and pumps water into the water box or pumps water in the water box according to the water level detected by the water level detector.

Preferably, an upper partition plate and a lower partition plate are arranged inside the detection box, an upper layer channel is formed above the upper partition plate, an intermediate layer channel is formed between the upper partition plate and the lower partition plate, a lower layer channel is formed below the lower partition plate, an upper vent hole for communicating the upper layer channel with the intermediate layer channel is formed on the upper partition plate, a lower vent hole for communicating the intermediate layer channel with the lower layer channel is formed on the lower partition plate, the first air inlet is communicated with the upper layer channel, the second air inlet and the second air outlet are communicated with the lower layer channel, the first air exhaust path is formed by the upper layer channel, the intermediate layer channel and the lower layer channel, and the second air exhaust path is formed by the lower layer channel. In this way, the second exhaust path is shorter, and the condensation can be reduced by exhausting through the second exhaust path.

The sensing head of the wet bulb thermometer and the dry bulb thermometer are arranged in the lower layer channel.

Further preferably, the sensing head of the wet bulb thermometer and the dry bulb thermometer are close to the second air inlet.

In order to make the position arrangement of the first air inlet, the second air inlet and the air outlet more reasonable, the detection box is provided with a left cover plate and a right cover plate, the first air inlet and the second air inlet are arranged on the right cover plate, and the air outlet is arranged on the left cover plate.

In order to keep the sensing head of the wet bulb thermometer in a wet state, gauze is wrapped on the sensing head of the wet bulb thermometer.

Preferably, the water level detector is a water level detection plate mounted on the detection cartridge.

In order to control the bidirectional water pump, the water level control system further comprises a controller which can receive the output signal of the water level detector and correspondingly control the bidirectional water pump according to the output signal.

Compared with the prior art, the utility model has the advantages that: the air valve of the humidity detection device of the steam oven is an inlet/outlet switching air valve, namely, one path can be kept and the other path can be kept closed, a dry bulb thermometer and a wet bulb thermometer are arranged on the lower layer of the detection box, a bidirectional water pump pumps water into the water box or pumps water in the water box correspondingly according to the water level detected by the water level detector, and the relative humidity in the liner is detected by a dry bulb method, so that the accurate control of the humidity of the liner is realized.

Drawings

FIG. 1 is a schematic view of a steaming oven according to an embodiment of the present utility model;

FIG. 2 is a cross-sectional view showing the structure of a cartridge according to an embodiment of the present utility model;

FIG. 3 is a schematic diagram of an air valve according to an embodiment of the present utility model.

Detailed Description

The utility model is described in further detail below with reference to the embodiments of the drawings.

As shown in fig. 1 and 2, the humidity detection device of the steaming and baking oven of the present embodiment includes a liner 1, a hot air blower 2, an exhaust pipe 3, a liner temperature sensor 4, a detection box 5, an air valve 6, a water box 7, a wet bulb thermometer 8, a dry bulb thermometer 9, a water level detector 10, a bidirectional water pump 11, gauze 12, a controller (not shown), and the like.

With the direction indicated by arrow A in FIG. 1 as forward direction, the air heater 2, the exhaust pipe 3 and the inner container temperature sensor 4 are arranged on the left side wall of the inner container 1, the air heater 2 blows air into the inner container 1, the exhaust pipe 3 discharges hot air in the inner container 1 outwards, and the inner container temperature sensor 4 is used for detecting the inner temperature of the inner container 1. The cartridge 5 is mounted outside the inner container 1, and the cartridge 5 has a first air inlet 51, a second air inlet 52, and an air outlet 53.

The cartridge 5 has a left cover plate 59 and a right cover plate 510 with the direction indicated by an arrow B in fig. 2, and the first air inlet 51 and the second air inlet 52 are provided on the right cover plate 510, and the air outlet 53 is provided on the left cover plate 59. The detection box 5 is internally provided with an upper partition plate 54 and a lower partition plate 55, an upper layer channel 56 is formed above the upper partition plate 54, an intermediate layer channel 57 is formed between the upper partition plate 54 and the lower partition plate 55, a lower layer channel 58 is formed below the lower partition plate 55, an upper vent 541 which is communicated with the upper layer channel 56 and the intermediate layer channel 57 is formed on the upper partition plate 54, a lower vent 551 which is communicated with the intermediate layer channel 57 and the lower layer channel 58 is formed on the lower partition plate 55, the first air inlet 51 is communicated with the upper layer channel 56, and the second air inlet 52 and the air outlet 53 are communicated with the lower layer channel 58. The upper layer passage 56, the middle layer passage 57 and the lower layer passage 58 together constitute a first exhaust path, that is, the first air inlet 51 communicates with the exhaust port 53 through the upper layer passage 56, the middle layer passage 57 and the lower layer passage 58 in this order, the lower layer passage 58 constitutes a second exhaust path, and the second air inlet 52 communicates with the exhaust port 53 through the lower layer passage 58. It can be seen that the first exhaust path is a tortuous path and the second exhaust path is a straight path, the first exhaust path being longer than the second exhaust path.

Referring to fig. 3, the air valve 6 is a two-in/two-out switching valve, an inlet 60 of the air valve 6 is communicated with the exhaust pipe 3, a first outlet 61 of the air valve 6 is communicated with the first air inlet 51, and a second outlet 62 of the air valve 6 is communicated with the second air inlet 52. The other path can be kept closed, and the two paths can not be controlled to be opened simultaneously, and the two paths can not be controlled to be closed simultaneously.

The water box 7 is arranged below the detection box 5, the upper end of the wet bulb thermometer 8 is a temperature sensing head and stretches into the detection box 5, gauze 12 is wrapped on the sensing head of the wet bulb thermometer 8, the lower end of the wet bulb thermometer 8 is immersed in the water box 7, and the dry bulb thermometer 9 is arranged inside the detection box 5. In this embodiment, the sensing head of the wet bulb thermometer 8 and the dry bulb thermometer 9 are disposed within the lower channel 58 and adjacent to the second air inlet 52.

The water level detector 10 is a water level detection plate mounted on the detection cartridge 5 for detecting the water level of the water cartridge 7. The bidirectional water pump 11 is arranged outside the water box 7 and is communicated with the water box 7, the controller can solve the output signal of the water level detector 10, and under the control of the controller, the bidirectional water pump 11 pumps water into the water box 7 or pumps water out of the water box 7 according to the water level detected by the water level detector 10. When the water level detection plate detects the lowest water level of the water box 7, water is pumped into the water box 7 through the two-way water pump 11, so that the gauze 12 is always in a wet state. When the condensed water exists in the detection box 5, the condensed water can flow into the water box 7 below along the gauze 12, and when the water level of the water box 7 reaches the highest water level, the bidirectional water pump 11 works reversely to pump out the water in the water box 7, so that the water is prevented from overflowing.

During operation, the rotating speed of the air heater 2 is kept stable, the rotating speed is controlled to be at least more than 1000RPM, and then in the cooking process, hot air in the liner 1 sequentially passes through the exhaust pipe 3, the air valve 6, the detection box 5, the dry bulb thermometer 9 and the wet bulb thermometer 8, and because the rotating speed of the air heater 2 is stable and high, the air speed when hot air reaches the dry bulb thermometer 9 and the wet bulb thermometer 8 is also relatively stable.

When the temperature sensor 4 detects that the temperature in the liner 1 is not less than T0, the first outlet 61 of the air valve 6 is opened, the second outlet 62 of the air valve 6 is closed, and air in the liner 1 passes through the dry bulb thermometer 9 and the wet bulb thermometer 8 through the first exhaust path. At this time, since the temperature of the air in the liner 1 when it comes out of the exhaust pipe 3 is high, it is necessary to lengthen the path of the air to lower the temperature of the air so that the temperature of the air reaches the dry and wet bulb temperature meter is less than 100 ℃.

When the temperature sensor 4 detects that the temperature in the liner is less than T0, the second outlet 62 of the air valve 6 is opened, the first outlet 61 of the air valve 6 is closed, and the air in the liner 1 passes through the dry bulb thermometer 9 and the wet bulb thermometer 8 through the second exhaust path. At this time, since the temperature of the air in the liner 1 when it exits from the exhaust pipe 3 is low, it is necessary to shorten the air path as much as possible, minimize condensation, and prevent the relative humidity detected by the wet and dry bulb method from deviating from the actual relative humidity in the liner 1.

According to different steaming and baking platforms, the temperature value of T0 is required to be based on the actual test value, and is generally 120-150 ℃.

For example: when the temperature sensor 4 detects that the temperature in the inner container 1 is 150 ℃, air flows along the first exhaust path, and when the set mode is the pure baking mode, the hot air in the inner container 1 is dry hot air, the relative humidity is 0%, at the moment, the temperature difference of the dry ball and the wet ball is deltat, all the temperature points are measured according to the method, and the temperature difference of the dry ball and the wet ball in the pure baking mode is formed into a database.

When the steam and roast combination mode is started next time, the temperature value of the inner container is 150 ℃, and when the temperature difference of the dry and wet balls is 1/2 delta t, the relative humidity of the inner container 1 at the moment is (1/2 delta t)/delta t=50%. When the dry and wet bulb temperature difference deltat is approximately equal to 0, the relative humidity is approximately equal to 100 percent no matter what the temperature in the liner 1 is.

In the description and claims of the present utility model, terms indicating directions, such as "front", "rear", "upper", "lower", "left", "right", "side", "top", "bottom", etc., are used to describe various example structural parts and elements of the present utility model, but these terms are used herein for convenience of description only and are determined based on the example orientations shown in the drawings. Because the disclosed embodiments of the utility model may be arranged in a variety of orientations, the directional terminology is used for purposes of illustration and is in no way limiting, such as "upper" and "lower" are not necessarily limited to being in a direction opposite or coincident with the direction of gravity.

Claims

1. The utility model provides a humidity detection device of steam oven, includes inner bag (1) and installs air heater (2) and blast pipe (3) on the inner bag wall, its characterized in that still includes:

the inner container temperature sensor (4) is arranged on the inner container wall and is used for detecting the internal temperature of the inner container (1);

a detection box (5) mounted outside the inner container (1), the detection box (5) having a first air inlet (51), a second air inlet (52) and an air outlet (53), a passage between the first air inlet (51) and the air outlet (53) constituting a first air outlet path, a passage between the second air inlet (52) and the air outlet (53) constituting a second air outlet path, and the first air outlet path being longer than the second air outlet path;

the air valve (6) is a one-in two-out switching valve, an inlet (60) of the air valve (6) is communicated with the exhaust pipe (3), a first outlet (61) of the air valve (6) is communicated with the first air inlet (51), and a second outlet (62) of the air valve (6) is communicated with the second air inlet (52);

the water box (7) is arranged below the detection box (5);

a wet bulb thermometer (8), the upper end of which is a temperature sensing head and extends into the detection box (5), and the lower end of which is immersed into the water box (7);

a dry bulb thermometer (9) mounted inside the detection box (5);

a water level detector (10) mounted on the water box (7) for detecting the water level of the water box (7)

And the bidirectional water pump (11) is arranged outside the water box (7) and is communicated with the water box (7), and pumps water into the water box (7) or pumps water in the water box (7) according to the water level detected by the water level detector (10).

2. The humidity detection apparatus of a steaming oven according to claim 1, wherein: the detection box (5) is internally provided with an upper partition plate (54) and a lower partition plate (55), an upper layer channel (56) is formed above the upper partition plate (54), an intermediate layer channel (57) is formed between the upper partition plate (54) and the lower partition plate (55), a lower layer channel (58) is formed below the lower partition plate (55), an upper vent hole (541) for communicating the upper layer channel (56) with the intermediate layer channel (57) is formed in the upper partition plate (54), a lower vent hole (551) for communicating the intermediate layer channel (57) with the lower layer channel (58) is formed in the lower partition plate (55), the first air inlet (51) is communicated with the upper layer channel (56), the second air inlet (52) is communicated with the lower layer channel (58), the upper layer channel (56), the intermediate layer channel (57) and the lower layer channel (58) form the first air exhaust path together, and the lower layer channel (58) forms the second air exhaust path.

3. The humidity detection apparatus of a steaming oven according to claim 2, wherein: the sensing head of the wet bulb thermometer (8) and the dry bulb thermometer (9) are arranged in the lower layer channel (58).

4. A humidity sensing apparatus of a steam oven according to claim 3 wherein: the induction head of the wet bulb thermometer (8) and the dry bulb thermometer (9) are close to the second air inlet (52).

5. The humidity detection apparatus of a steaming oven according to claim 2, wherein: the detection box (5) is provided with a left cover plate (59) and a right cover plate (510), the first air inlet (51) and the second air inlet (52) are both arranged on the right cover plate (510), and the air outlet (53) is arranged on the left cover plate (59).

6. The humidity detection apparatus of a steaming oven according to claim 1, wherein: a gauze (12) is wrapped on the sensing head of the wet bulb thermometer (8).

7. The humidity detection apparatus of a steaming oven according to claim 1, wherein: the water level detector (10) is a water level detection plate arranged on the detection box (5).

8. The humidity detection apparatus of a steaming oven according to any one of claims 1 to 7, wherein: the water level detector also comprises a controller which can receive the output signal of the water level detector (10) and correspondingly control the bidirectional water pump (11) according to the output signal.