CN111089282A

CN111089282A - Steam generator of household appliance, control method thereof and steam oven

Info

Publication number: CN111089282A
Application number: CN201911413890.8A
Authority: CN
Inventors: 赵鹏飞; 司鹏; 唐相伟
Original assignee: Midea Group Co Ltd; Guangdong Midea Kitchen Appliances Manufacturing Co Ltd
Current assignee: Midea Group Co Ltd; Guangdong Midea Kitchen Appliances Manufacturing Co Ltd
Priority date: 2019-12-31
Filing date: 2019-12-31
Publication date: 2020-05-01

Abstract

The invention discloses a steam generator of a household appliance, a control method thereof and a steam oven, wherein the steam generator comprises: the water containing box is internally provided with a heating cavity and a measuring cavity which are communicated, and the water containing box is provided with a water inlet and a steam outlet which are communicated with the heating cavity; the thick film heating plate is arranged on the water containing box and heats the heating cavity in the heating cavity and the measuring cavity; the liquid level detection piece is used for detecting the liquid level height in the measuring cavity; the water inlet is used for inputting water flow into the heating cavity, and the water inlet is electrically connected with the liquid level detection piece. According to the steam generator of the household appliance, the working efficiency of the steam generator can be improved, and the application range and the safety of the steam generator are improved.

Description

Steam generator of household appliance, control method thereof and steam oven

Technical Field

The invention relates to the technical field of household appliances, in particular to a steam generator of a household appliance, a control method of the steam generator and a steam oven with the steam generator.

Background

The general steam generator is provided with heating elements for heating water liquid. Some heating elements are traditional heating pipes, so that the thermal inertia is large, the air outlet speed is low, and the operation efficiency of the steam generator is low. Some heating elements adopt a thick film heating circuit, however, the steam generator is top-mounted or back-mounted, has a small application range, and is not suitable for a desktop type steaming oven with high requirement on space compactness.

In the related art, the steam generator is also provided with a liquid level detecting member for detecting a liquid level inside the steam generator. However, the liquid surface fluctuation is easy to be unstable due to the liquid boiling, the measurement accuracy of the liquid level detection part is low, and the working performance and the safety of the steam generator are affected.

Disclosure of Invention

The present invention is directed to solving at least one of the problems of the prior art. Therefore, the invention provides a steam generator of a household appliance, which is used for improving the working efficiency of the steam generator and improving the application range and safety of the steam generator.

The invention also aims to provide the steam oven with the steam generator, so that the operation efficiency of the steam oven is improved, and the application range and the safety of the steam oven are improved.

The invention also aims to provide a control method of the steam generator, so as to improve the working efficiency of the steam generator.

A steam generator of a home appliance according to an embodiment of the present invention includes: the water containing box is internally provided with a heating cavity and a measuring cavity which are communicated, and the water containing box is provided with a water inlet and a steam outlet which are communicated with the heating cavity; the thick film heating plate is arranged on the water containing box and heats the heating cavity in the heating cavity and the measuring cavity; the liquid level detection piece is used for detecting the liquid level height in the measuring cavity; the water inlet is used for inputting water flow into the heating cavity, and the water inlet is electrically connected with the liquid level detection piece.

According to the steam generator of the household appliance, the thick film heating plate is adopted for heating water liquid, the occupied space of the steam generator is small, and the application range of the steam generator can be widened. For example, the steam generator may be applied to a desktop type steam oven, and may also be applied to a built-in type steam oven. Steam generator's thermal inertia is little, and response speed is fast, can go out steam fast, and heats more evenly, can increase the steam generation volume in the unit area to steam generator's operating efficiency can be improved, user's experience is felt is promoted. In addition, through the heating of thick film hot plate to the heating chamber in heating chamber and the measurement chamber, directly not to the water liquid heating of measuring the chamber, the liquid level of measuring the chamber is relatively stable to can improve the precision of liquid level detection spare, improve steam generator's security.

In some embodiments, the steam generator of the home appliance further includes: the bubble breaking piece is arranged in the heating cavity.

Specifically, broken bubble spare is broken bubble orifice plate, broken bubble orifice plate is located the below of steam outlet just is located the top of thick film hot plate, be equipped with a plurality of through-holes on the broken bubble orifice plate.

In some embodiments, the steam generator of the home appliance further includes: the steam-water separation structure is arranged in the heating cavity, the steam-water separation structure is positioned below the steam outlet and above the thick film heating plate, and the steam-water separation structure constructs a plurality of steam flow channels with the steam outlets converging.

Specifically, the catch water structure includes one-level catch water structure, one-level catch water structure includes: the steam flow passage comprises a plurality of flat plates, air gaps are defined between the adjacent flat plates, the baffle is arranged right above or below each air gap, the baffle is connected to one of the flat plates forming the air gaps, and the other flat plate forming the air gaps is matched with the baffle to form the steam flow passage.

In some optional embodiments, the water separation structure comprises a secondary water separation structure comprising: the steam channel is characterized by comprising a plurality of arc-shaped plates arranged in rows, and the adjacent arc-shaped plates define an arc-shaped steam channel.

In some embodiments, a partition is disposed in the water containing box, the heating cavity and the measuring cavity are formed by two opposite sides of the partition, the top and the bottom of the partition are spaced from the top wall and the bottom wall of the water containing box, respectively, and the steam outlet is disposed on the top wall of the water containing box.

In some embodiments, the box wall of the water containing box is provided with a mounting hole, the thick film heating plate is arranged on the mounting hole, and the thick film heating plate forms the cavity wall of the heating cavity.

In some embodiments, the thick film heating plate comprises: the substrate is welded and connected to the water containing box; a heating wire provided on the substrate in a meandering manner; the steam generator further comprises a temperature detection piece arranged on the substrate, and the temperature detection piece is electrically connected with the water inlet driving piece.

The steam oven provided by the embodiment of the invention comprises the steam generator of the household appliance provided by the embodiment, and the steam generator is arranged on the side wall of the steam oven.

According to the steam oven provided by the embodiment of the invention, the thick film heating plate is adopted for heating water liquid, the steam generator is small in thermal inertia, high in response speed and capable of quickly generating steam, the heating is more uniform, and the steam generation amount in a unit area can be increased, so that the operation efficiency of the steam oven can be improved, and the experience of a user can be improved. Through the heating of thick film hot plate to the heating chamber in heating chamber and the measurement chamber, directly not to the water liquid heating of measuring the chamber, the liquid level of measuring the chamber is relatively stable to can improve the precision of liquid level detection spare, improve the security of steaming and baking oven. The steam generator is arranged on the side wall of the steaming and baking oven, thereby being beneficial to the miniaturization of the steaming and baking oven and being capable of expanding the application range of the steaming and baking oven.

According to the control method of the steam generator of the embodiment of the invention, the control process of the steam generator of the household appliance comprises the following steps: after the heating chamber is started, the thick film heating plate is electrified and heated in a dry burning mode, and after the thick film heating plate is heated to reach a first condition, the water inlet driving piece starts to supply water to the heating chamber.

According to the control method of the steam generator provided by the embodiment of the invention, the heating cavity starts to supply water only after the thick film heating plate is heated to reach the first condition, so that the heating efficiency of the thick film heating plate is high, and the operation efficiency of the steam generator is improved.

In some embodiments, the liquid level height of the measurement cavity is provided with a first threshold value and a second threshold value, and when the liquid level detection piece detects that the liquid level in the measurement cavity is lower than the first threshold value and does not exceed the first threshold value after self-starting, the water inlet driving piece supplies water at a rated flow rate of a first multiplying power; when the liquid level detection piece detects that the liquid level in the measurement cavity is greater than or equal to the first threshold value and less than or equal to the second threshold value, the water inlet driving piece supplies water at a rated flow rate of a second multiplying power; when the liquid level detection piece detects that the liquid level in the measurement cavity is larger than the second threshold value, the water inlet driving piece supplies water at a rated flow of a third multiplying power; when the liquid level detection piece detects that the liquid level in the measurement cavity is lower than the first threshold value and exceeds the first threshold value after self-starting, the water inlet driving piece supplies water at the rated flow of the fourth multiplying power.

Additional aspects and advantages of the invention will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the invention.

Drawings

The above and/or additional aspects and advantages of the present invention will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings of which:

FIG. 1 is a schematic structural view of a steam generator according to an embodiment of the present invention;

fig. 2 is an exploded view of a steam generator according to an embodiment of the present invention;

FIG. 3 is a perspective view of an embodiment of the present invention;

FIG. 4 is a perspective view of a desktop steamer in accordance with an embodiment of the present invention;

FIG. 5 is a schematic structural diagram of a bubble breaking member according to an embodiment of the present invention;

FIG. 6 is a schematic view of a steam generator according to an embodiment of the present invention;

FIG. 7 is a schematic structural diagram of a thick film heater plate according to an embodiment of the present invention.

Reference numerals:

a steaming and baking oven 1000,

A steam generator 100,

Water containing box 1, heating cavity 11, water inlet 111, steam outlet 112, measuring cavity 12, partition board 13, mounting opening 14, clamping projection 15, cover plate 16, fixing hole 161, box body 17, groove 171, fixing lug 172,

A thick film heating plate 2, a substrate 21, a heating wire 22,

A liquid level detection piece 3,

A water inlet driving piece 4,

A bubble breaking piece 5,

A steam-water separation structure 6, a primary steam-water separation structure 61, a flat plate 611, a baffle 612, a secondary steam-water separation structure 62,

A temperature detection piece 8,

And a seal 9.

Detailed Description

Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the accompanying drawings are illustrative only for the purpose of explaining the present invention, and are not to be construed as limiting the present invention.

In the description of the present invention, it is to be understood that the terms "upper", "lower", "horizontal", "top", "bottom", "inner", "outer", "vertical", "length", "width", and the like, indicate orientations or positional relationships based on those shown in the drawings, and are used only for convenience in describing the present invention and for simplicity in description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus, are not to be construed as limiting the present invention. Furthermore, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present invention, "a plurality" means two or more unless otherwise specified.

In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.

A steam generator 100 of a home appliance according to an embodiment of the present invention is described below with reference to fig. 1 to 7.

The steam generator 100 of the home appliance according to the embodiment of the present invention, as shown in fig. 1 and 2, includes: water containing box 1, thick film heating plate 2, liquid level detection piece 3 and water inlet driving piece 4. The water containing box 1 is internally provided with a heating cavity 11 and a measuring cavity 12 which are communicated, and the water containing box 1 is provided with a water inlet 111 and a steam outlet 112 which are communicated with the heating cavity 11. The thick film heating plate 2 is arranged on the water containing box 1, and the thick film heating plate 2 heats the heating cavity 11 in the heating cavity 11 and the measuring cavity 12. The level detection element 3 is used to detect the level of the liquid in the measurement chamber 12. The water inlet driving member 4 is used for driving water flow to enter the heating cavity 11 from the water inlet 111, and the water inlet driving member 4 is electrically connected with the liquid level detection member 3.

It can be understood that the steam generator 100 is heated by the thick film heating plate 2, and the thick film heating plate 2 occupies a small space, so that the volume of the steam generator 100 can be reduced, and the installation position of the steam generator 100 is very flexible. Taking the steam oven 1000 as an example, the steam generator 100 may be installed on the top of the steam oven 1000, or may be installed on the back of the steam oven 1000, as shown in fig. 3 and 4, or may be installed on the side wall of the steam oven 1000. The steam generator 100 is less restricted in installation after occupying a small space, and can be installed in a home appliance having a large installation space or a home appliance having a small installation space, thereby increasing the application range of the steam generator 100. For example, as shown in fig. 3, the steam generator 100 may be applied to a built-in type steam oven, as shown in fig. 4, and may also be applied to a table top type steam oven.

In the embedded steam oven in the related art, the thick film type steam generator is mostly positioned at the top and the back of the steam oven, so that the size is large, the occupied space is large, and the great space waste is caused. As shown in fig. 3, the steam generator 100 of the present invention can provide a side wall installation manner, so that a space can be reasonably utilized and a waste of the space can be reduced as much as possible.

In the desktop type steam oven in the related art, the requirement on space compactness is high, a boiler type steam generator or a flow channel type steam generator mounted on the side wall is mostly adopted, however, the steam generator mounted on the side wall mostly belongs to the traditional heating tube type steam generator, the thermal inertia is large, and the air outlet speed is low. As shown in fig. 2 and 4, the steam generator 100 of the present invention uses the thick film heating plate 2 to heat water, and compared with the conventional heating tube, the thick film heating plate 2 does not store heat during the heating process, has small thermal inertia and fast response speed, and can rapidly output steam; the mode of face heating makes the heating more even, and the boiling is more even to can increase the steam generation volume in the unit area, thereby can improve steam generator 100's operating efficiency, promote user's experience and feel.

It can be understood that after the water in the water containing box is heated and evaporated by the thick film heating plate, the liquid level is gradually reduced due to the reduction of the water in the water containing box, and the thick film heating plate is exposed out of the liquid level due to excessive reduction of the water, so that dry burning is caused. For avoiding the dry combustion problem, can set up liquid level detection spare on holding the water box usually to timely moisturizing avoids the moisturizing too much to lead to steam volume to descend and leads to the work nature to descend, also avoids the moisturizing too little to lead to the thick film hot plate dry combustion method to lead to the security to descend.

However, if the liquid level detection piece is used for directly detecting the liquid level in the heating cavity, the situation of inaccurate detection is caused by violent boiling after water is directly heated. To solve this problem, the embodiment of the present invention improves the internal structure of the steam generator. That is, in the steam generator 100 according to the embodiment of the present invention as described above, the inner chamber of the water containing box 1 is divided into the heating chamber 11 and the measuring chamber 12 which are communicated with each other, the heating chamber 11 is directly heated by the thick film heating plate 2 without directly heating the measuring chamber 12, that is, the thick film heating plate 2 is in contact with the water in the heating chamber 11 but not in contact with the water in the measuring chamber 12 during normal operation, and the liquid level detecting member 3 detects the liquid level in the measuring chamber 12. (it should be noted that although reference is made herein to "water in the heating chamber 11" and "water in the measurement chamber 12", this does not limit the water not being able to circulate between the heating chamber 11 and the measurement chamber 12, but for ease of understanding, the water previously located in the heating chamber 11 and flowing down to the measurement chamber 12 will be referred to as "water in the measurement chamber 12", and vice versa.)

In actual use, as shown in fig. 2, the water inlet driving member 4 drives water flow into the heating chamber 11 from the water inlet 111, and at the same time, the water flow also enters the measuring chamber 12, and the water levels in the heating chamber 11 and the measuring chamber 12 can be leveled according to the principle of communicating vessels. It should be noted here that the water inlet 111 may be disposed opposite to the heating chamber 11 (i.e. the water flow first flows into the heating chamber 11), the water inlet 111 may also be disposed opposite to the inner wall of the measuring chamber 12 (i.e. the water flow first flows into the measuring chamber 12 and then flows into the heating chamber 11), or a part of the water inlet 111 is disposed opposite to the heating chamber 11 and a part is disposed opposite to the measuring chamber 12.

In the steam generator 100 of the present invention, the thick film heating plate 2 directly heats the heating chamber 11, and does not directly heat the water in the measuring chamber 12, so that when the water in the heating chamber 11 is vigorously boiled, the boiling degree of the water in the measuring chamber 12 is much smaller, and even the water may not be boiled, the liquid level is relatively stable, and the liquid level detecting member 3 can more accurately detect the liquid level height in the measuring chamber 12, thereby improving the accuracy of the liquid level detecting member 3. After the liquid level detection precision degree is improved, a proper amount of water can be reminded to be timely supplemented, and then the operability and the safety of the steam generator 100 are improved.

According to the steam generator 100 of the household appliance of the embodiment of the invention, the thick film heating plate 2 is adopted to heat the water liquid, the occupied space of the steam generator 100 is small, and the application range of the steam generator 100 can be widened. For example, the steam generator 100 may be applied to a desktop type steam oven, and may also be applied to a built-in type steam oven. Steam generator 100's thermal inertia is little, and response speed is fast, can go out steam fast, and heats more evenly, can increase the steam generation volume in the unit area to can improve steam generator 100's operating efficiency, promote user's experience and feel. In addition, heating cavity 11 in heating cavity 11 and the measurement chamber 12 is heated through thick film hot plate 2, and the liquid level of measurement chamber 12 is relatively stable to the water liquid heating of measurement chamber 12 not directly to can improve the precision of liquid level detection piece 3, improve steam generator 100's security.

In some embodiments, as shown in fig. 2 and 5, the steam generator 100 of the home appliance further includes: the bubble breaking piece 5, the bubble breaking piece 5 is arranged in the heating cavity 11. It can be understood that, during the boiling process of the liquid in the heating chamber 11, a large amount of bubbles will be generated, and a large amount of water liquid will be mixed in the bubbles, and the bubble breaking member 5 can break the bubbles, so as to reduce the amount of bubbles as much as possible and reduce the amount of liquid droplets contained in the steam.

Specifically, as shown in fig. 2 and 5, the bubble breaking member 5 is a bubble breaking hole plate, the bubble breaking hole plate is located below the steam outlet 112 and above the thick film heating plate 2, and a plurality of through holes are formed in the bubble breaking hole plate. It can be understood that, when the bubble moves to the broken bubble orifice plate, the non-through hole of the broken bubble orifice plate can break the bubble, the passing of the blocking bubble, namely the broken bubble orifice plate can break the bubble generated by the violent boiling, the through hole of the broken bubble orifice plate can block the passing of the big bubble, so that the atmosphere is broken or changed into the small bubble, thereby reducing the amount of liquid water drops carried when the bubble leaves water liquid, and further improving the steam dryness of the steam outlet 112.

Optionally, as shown in fig. 2, a clamping protrusion 15 is arranged on the water containing box, a clamping groove is arranged in the clamping protrusion 15, and the bubble breaking hole plate is fitted in the clamping groove. It can be understood that the clamping protrusions 15 can limit and fix the bubble breaking hole plate, so that the installation stability of the bubble breaking hole plate can be improved.

Alternatively, as shown in fig. 5, the through holes are uniformly distributed along the length and width directions of the bubble-breaking hole plate, and the inner diameter of the through holes may be 0-5 mm. Preferably, the inner diameter of the through-hole may be 3 mm. The bubble breaking hole plate has a good bubble breaking effect on bubbles, and the uniform arrangement of the through holes is favorable for improving the stability of the liquid level in the bubble breaking treatment process and reducing the fluctuation of water liquid.

In other embodiments of the present invention, the bubble-breaking member 5 may have other structures. For example, the foam breaker 5 can be provided as a sieve, and the sieve openings can be provided small and dense. For example, the bubble breaker 5 may be provided as a plurality of intercepting columns, and the plurality of intercepting columns may be parallel or cross, and the bubbles may easily break when they hit the intercepting columns.

In some embodiments, as shown in fig. 2 and 6, the steam generator 100 of the home appliance further includes: steam-water separation structure 6, steam-water separation structure 6 establish in heating chamber 11, and steam-water separation structure 6 is located the below of steam outlet 112 and is located the top of thick film hot plate 2, and steam-water separation structure 6 constructs a plurality of steam flow channels that the steam outlet 112 of orientation catched. It can be understood that the steam-water separation structure 6 can separate the steam-liquid mixture generated by boiling water liquid to improve the steam quality of the air outlet. For example, the steam-water separation structure 6 can separate the steam-liquid mixture by using the principle of gravity separation, for example, the steam-water separation structure 6 can separate the steam-liquid mixture by using the principle of inertial force separation, and for example, the steam-water separation structure 6 can separate the steam-liquid mixture by using the principle of water membrane separation. In addition, the steam runner can play the guide effect to the flow of steam, improves out vapour efficiency.

Specifically, as shown in fig. 2 and fig. 6, the steam-water separation structure 6 includes a primary steam-water separation structure 61, and the primary steam-water separation structure 61 includes: the steam generator comprises flat plates 611 and baffles 612, wherein the number of the flat plates 611 is multiple, air gaps are defined between the adjacent flat plates 611, the baffles 612 are arranged right above or below each air gap, the baffles 612 are connected to one of the flat plates 611 forming the air gaps, and the baffles 612 are matched with the other flat plate 611 forming the air gaps to form a steam flow channel. It will be appreciated that natural separation of the vapor-liquid mixture can be achieved by taking advantage of the difference in gravity due to the greater difference in density between the vapor and water. When the vapor-liquid mixture passes through the flat plate 611 and the baffle 612 of the primary vapor-water separation structure 61, the direction of the airflow changes, different inertia forces are generated by the vapor and the water, the viscosity of the vapor and the water is poor, and a separation effect can be generated, so that the effect of vapor-water separation can be further improved. Specifically, when the vapor-liquid mixture flows to the flat plate 611, the moving direction of the vapor changes, and the vapor finally flows to the air gap and flows to the vapor outlet 112 through the vapor flow channel. The water easily adheres to the wall of the flat plate 611 to form a water film to fall down naturally, when the vapor-liquid mixture directly flows to the air gap, the vapor-liquid mixture meets the baffle, the vapor flows to the vapor outlet 112 along the vapor channel, and the water easily adheres to the wall of the baffle 612 to form a water film to flow down naturally. Thus, the steam in the air outlet 112 can reach a good dryness by the combined action of the flat plate 611 and the baffle 612.

Optionally, the first-stage steam-water separation structures 61 are arranged in a horizontal array, the number of the arrays can be 15, and the distance between adjacent arrays can be 8 mm. Therefore, the efficiency of gas-liquid separation is high, and a good gas-liquid separation effect can be realized. Of course, in some other embodiments, the arrangement of the primary steam-water separation structure 61 may be set according to the specific size of the heating chamber 11, and the specific arrangement of the primary steam-water separation structure 61 is not limited herein.

In some optional embodiments, as shown in fig. 2 and 6, the steam-water separation structure 6 includes a secondary steam-water separation structure 62, and the secondary steam-water separation structure 62 includes: a plurality of arc plates arranged in rows, and an arc-shaped steam channel is defined between adjacent arc plates. It can be understood that the secondary steam-water separation structure 62 performs secondary steam-water separation on the steam passing through the primary steam-water separation structure 61 by using the principles of gravity separation, centrifugal separation, inertial separation, and water-film separation. When the steam passes through the arc-shaped structure of the secondary steam-water separation structure 62, the steam and water are separated by different centrifugal forces generated during rotation.

It can be understood that, when the gas-liquid mixture flows to the second-stage steam-water separation structure 62, the arrangement of the arc plate can change the direction of the air flow, steam and water generate different inertia force, and the viscosity of the steam and the water is poor, so that the steam flows to the steam outlet 112 through the steam flow channel, and the water easily adheres to the wall surface of the arc plate to form a water film to naturally fall down, thereby improving the steam-water separation effect. In addition, when the gas-liquid mixture flows through the arc-shaped steam channel defined between the adjacent arc-shaped plates, the steam and the water generate different centrifugal forces to generate a separation effect, so that the separation effect of the secondary steam-water separation structure 62 can be further improved.

Alternatively, the secondary steam-water separation structures 62 may be arranged in a horizontal array, the number of the arrays may be 30, and the distance between adjacent arrays may be 4 mm. Therefore, the efficiency of gas-liquid separation is high, and a good gas-liquid separation effect can be realized. Of course, in other embodiments, the arrangement of the secondary steam-water separation structure 62 may be set according to the specific size of the heating chamber 11, and the specific arrangement of the secondary steam-water separation structure 62 is not limited herein.

In the example of fig. 2, both the bubble breaking piece 5 and the steam-water separation structure 6 are arranged in the water containing box 1, and the bubble breaking piece 5 is positioned below the steam-water separation structure 6. When the water containing box 1 has a set liquid level and the liquid level detection piece 3 is arranged to keep the liquid level in the box at the set liquid level, the bubble breaking piece 5 is usually arranged below the set liquid level to intercept bubbles in water, and the steam-water separation structure 6 is arranged above the set liquid level to further separate evaporated steam.

In some embodiments, as shown in fig. 2 and 6, a partition plate 13 is disposed in the water containing box 1, the heating chamber 11 and the measuring chamber 12 are formed on two opposite sides of the partition plate 13, the top and the bottom of the partition plate 13 are spaced from the top wall and the bottom wall of the water containing box 1, respectively, and the steam outlet 112 is disposed on the top wall of the water containing box 1. Thus, the water containing box 1 is divided by the partition board 13 to form the heating cavity 11 and the measuring cavity 12, and the heating cavity 11 and the measuring cavity 12 are communicated with each other. By using the principle of the communicating vessels, the liquid levels of the heating chamber 11 and the measuring chamber 12 are always kept consistent during the operation. The partition of the water containing box 1 and the communication of liquid in the box can be realized through the arrangement of the partition plate 13, the partition plate 13 is simple in structure and convenient to form, and the arrangement of other parts of the water containing box 1 is not influenced.

Alternatively, as shown in fig. 2 and 6, the top and bottom of the partition 13 may be spaced from the top wall and bottom wall of the water containing box 1 by a gap height of 0-10mm, so that the structural strength of the partition 13 can be ensured to provide a good spacing effect, and a good communication effect of the water in the water containing box 1 can be achieved.

Preferably, the top and bottom of the partition 13 may be spaced apart from the top and bottom walls of the water containing box 1 by a gap height of 5mm, respectively.

Alternatively, as shown in fig. 2 and 6, the steam outlet 112 may be located at a middle position of the top wall of the water containing box 1, and may have an inner diameter of 10mm and an outer diameter of 12 mm. Thus, the steam outlet 112 may have a certain structural strength, and the steam outlet amount of the steam outlet 112 may be increased. Of course, in other embodiments, the steam outlet 112 may have other dimensions to match the external dimensions of the steam generator 100, and the size of the steam outlet 112 is not particularly limited.

In some embodiments, as shown in fig. 2, the wall of the water containing box 1 is provided with a mounting opening 14, the thick film heating plate 2 is provided on the mounting opening 14, and the thick film heating plate 2 forms the wall of the heating cavity 11. Hold water box 1 like this and can play spacing, fixed action to thick film hot plate 2, improve thick film hot plate 2's installation stability. In addition, thick film hot plate 2 can constitute the chamber wall of heating chamber 11, and it need not to set up the chamber wall of heating chamber 11 alone to hold water box 1 like this, can further reduce the volume of holding water box 1, still plays material saving's effect.

Optionally, as shown in fig. 1, the water containing box 1 may be a cuboid, and the material thereof may be high temperature resistant food grade PPS, so that when water is heated and boiled in the water containing cavity, no harmful substance is carried, and the safety of a user may be improved. In addition, the water containing box 1 is formed in a rectangular parallelepiped shape, so that the forming is simple, the layout of internal components is facilitated, and the structural compactness of the steam generator 100 is improved. Of course, in some other embodiments, the water containing box 1 may also be in other shapes, such as a polyhedron, and can also realize the bearing function of the water liquid, and the specific shape of the water containing box 1 is not limited herein. Other materials, such as stainless steel, can be used for the water containing box 1.

Alternatively, as shown in fig. 2, the water containing box 1 comprises a box body 17 and a cover plate 16, the thick film heating plate 2 is arranged on the cover plate 16, and a sealing member 9 is arranged between the cover plate 16 and the box body 17. This facilitates the disassembly and assembly of the components in the water containing box 1, thereby facilitating the maintenance work of the steam generator 100. The sealing element 9 can improve the air tightness of the joint of the cover plate 16 and the box body 17, thereby improving the heat preservation effect and the safety of the water containing box 1 and reducing the loss of water vapor and heat.

Optionally, as shown in fig. 2, a fixing lug 172 is provided on the box body 17, a fixing hole 161 is provided on the cover 16, and the fixing lug 172 is matched with the fixing hole 161 through a fastener. Thus, when the fixing lug 172 is fixed to the fixing hole 161 by the fastener, the sealing member 9 is pressed by the box body 17 and the cover 16, and is deformed to perform a good sealing function. Of course, in other embodiments, the box 17 and the cover 16 may be selected from other matching manners, for example, a snap-fit structure can also achieve the above function, and the specific matching manner of the box 17 and the cover 16 is not limited herein.

Alternatively, as shown in fig. 2, the sealing member 9 may be a T-shaped silicone sealing gasket, a groove 171 is formed at the top of the peripheral wall of the cover plate 16, one side of the protrusion of the T-shaped silicone sealing gasket is fitted in the groove 171, and the other side of the sealing gasket is in contact with the cover plate 16, so that the water containing box 1 achieves a good sealing effect.

In some embodiments, as shown in fig. 2 and 7, the thick film heater plate 2 includes: a base plate 21 and a heating wire 22. The base plate 21 is connected to the water containing box 1 by welding, and the heating wire 22 is provided on the base plate 21 in a meandering manner. It can be understood that the substrate 21 can be stably mounted on the water containing box 1 by welding, and the sealing performance of the water containing box 1 and the safety of the steam generator 100 can be improved. For example, the potential safety hazard caused by the leakage of water liquid or steam can be reduced as much as possible, and for example, the leakage of steam can cause harm to human bodies, and the water containing box 1 has good air tightness, so that the safety of human bodies can be improved. The heating wire 22 is meanderly disposed on the substrate 21 so that the heating of the water liquid can be realized, and the contact area of the heating wire 22 with the water liquid is large, so that the heating of the water liquid can be accelerated, and the heating efficiency of the thick film heating plate 2 can be improved.

Optionally, at least 1 heating wire 22 is provided, as shown in fig. 7, two heating wires 22 may be provided, two thick film heating wires may be arranged on the substrate 21 in parallel, and the processing process may include screen printing, sintering, drying, and the like. The base plate 21 can be made of stainless steel SUS444, and the base plate 21 and the water containing box 1 can be connected and sealed in a laser welding mode.

As shown in fig. 7, the steam generator 100 further includes a temperature detector 8 disposed on the base plate 21, and the temperature detector 8 is electrically connected to the water inlet driving member 4. It can be understood that the temperature sensing member 8 may be used to monitor the surface temperature of the thick film heating plate 2, thereby improving the safety of the steam generator 100 and reducing the dry burning of the steam generator 100. If the setting through temperature detect 8, when temperature detect 8 detects that thick film hot plate 2 surface temperature is higher, can send signal to income water driving piece 4 for go into water driving piece 4 and in time supply water liquid, reduce the condition of dry combustion method, improve steam generator 100's security.

Alternatively, the temperature sensing member 8 may sense temperature using an NTC of negative temperature coefficient, which may be mounted on the outer wall surface of the thick film heating plate 2. The negative temperature coefficient NTC is sensitive to temperature and can improve the sensitivity of the temperature detector 8.

Of course, the liquid level in the water containing box 1 can be monitored and controlled in real time through the liquid level detection piece 3. For example, the liquid level detector 3 may be arranged such that when the liquid level detector 3 detects that the liquid level is below the thick film heater plate 2, the water inlet driver 4 can drive water flow from the water inlet 111 into the heating chamber 11. When the electrode type liquid level sensor detects that the liquid level is higher than the thick film heating plate 2, the water inlet driving piece 4 can stop working or reduce the water inlet speed. When liquid level detection spare 3 detects the inefficacy, temperature detection spare 8 can monitor the surface temperature of thick film hot plate 2, when temperature detection spare 8 detects the inefficacy, liquid level detection spare 3 can monitor, control hold the liquid level height in the water box 1 to provide dual guarantee for steam generator 100's normal work, thereby improve steam generator 100's security.

In some optional embodiments, the liquid level detection piece 3 can adopt an electrode type liquid level sensor, and the liquid level in the water containing box 1 can be controlled to a certain distance above the thick film heating plate 2 through the resistance value fed back by the liquid level sensor, so that the thick film heating plate 2 is ensured to be always in contact with water, and the dry burning phenomenon is avoided. Of course, in other embodiments, the liquid level detection element 3 may be of other types, such as an inductive liquid level meter, a pressure liquid level meter, etc., and the above functions can be achieved, and the specific type of the liquid level detection element 3 is not limited herein.

Optionally, the installation height of the liquid level detection element 3 is 10-50mm, so that the installation stability of the liquid level sensor can be improved, and a good signal response is provided, preferably 38 mm. The distance between the liquid level detection part 3 and the partition plate 13 is equal to that between the liquid level detection part and the side wall of the water containing cavity, and the distance is preferably 7.5mm, so that the working stability of the liquid level detection part 3 in the measuring cavity 12 can be improved, and the measuring accuracy of the liquid level detection part 3 is improved.

Alternatively, as shown in fig. 4, the water inlet drive 4 may be a water pump, for example, a 12VDC diaphragm pump may be used. The water pump can be connected with the water inlet 111 through a water inlet pipeline (not shown), and the on-off ratio of an electronic switch of the water pump is changed through signal feedback of a liquid level sensor and a temperature sensor so as to control the flow of the pumped water.

A steam generator 100 of a home appliance in one embodiment of the present invention will be described with reference to fig. 2 and 7.

The steam generator 100 of the home appliance according to the embodiment of the present invention includes: hold water box 1, thick film hot plate 2, liquid level detection spare 3, income water driving piece 4, broken bubble orifice plate, one-level steam-water separation structure 61, second grade steam-water separation structure 62 and temperature detect 8.

The water containing box 1 is internally provided with a heating cavity 11 and a measuring cavity 12 which are communicated, and the water containing box 1 is provided with a water inlet 111 and a steam outlet 112 which are communicated with the heating cavity 11. A partition plate 13 is arranged in the water containing box 1, the heating cavity 11 and the measuring cavity 12 are formed by the two opposite sides of the partition plate 13, the top and the bottom of the partition plate 13 are respectively spaced from the top wall and the bottom wall of the water containing box 1, and a steam outlet 112 is formed in the top wall of the water containing box 1. The box wall of the water containing box 1 is provided with a mounting opening 1.

The thick film heating plate 2 is arranged on the mounting opening 14, and the thick film heating plate 2 forms the cavity wall of the heating cavity 11. The thick film heater plate 2 can be heated with a heating chamber 11 in the heating chamber 11 and the measurement chamber 12. The thick film heating plate 2 includes: a base plate 21 and a heating wire 22. The base plate 21 is connected to the water containing box 1 by welding, and the heating wire 22 is provided on the base plate 21 in a meandering manner.

The level detection element 3 is used to detect the level of the liquid in the measurement chamber 12.

The water inlet driving member 4 is used for driving water flow to enter the heating cavity 11 from the water inlet 111, and the water inlet driving member 4 is electrically connected with the liquid level detection member 3.

The bubble breaking hole plate is positioned below the steam outlet 112 and above the thick film heating plate 2, and a plurality of through holes are arranged on the bubble breaking hole plate.

First-order catch water structure 61, first-order catch water structure 61 includes: the steam generator comprises flat plates 611 and baffles 612, wherein the number of the flat plates 611 is multiple, air gaps are defined between the adjacent flat plates 611, the baffles 612 are arranged right above or below each air gap, the baffles 612 are connected to one of the flat plates 611 forming the air gaps, and the baffles 612 are matched with the other flat plate 611 forming the air gaps to form a steam flow channel.

The secondary steam-water separation structure 62 includes: a plurality of arc plates arranged in rows, and an arc-shaped steam channel is defined between adjacent arc plates.

The temperature detector 8 is provided on the substrate 21, and the temperature detector 8 is electrically connected to the water inlet drive 4.

The structure of the steaming oven 1000 according to an embodiment of the present invention will be described with reference to fig. 1 to 7.

The steam oven 1000 according to the embodiment of the present invention, as shown in fig. 3 and 4, includes the steam generator 100 of the household appliance according to the above embodiment, and the steam generator 100 is disposed on a sidewall of the steam oven 1000. The structure of the steam generator 100 has been explained in the above description and will not be described in detail.

It can be understood that, in the related art, the thick film type steam generator is mostly located at the top and the back of the steaming oven, which is bulky and occupies a large space, resulting in great space waste. The steam generator 100 of the present invention may be disposed on a sidewall of the box 1000, so as to reasonably utilize space and reduce waste in space as much as possible, thereby miniaturizing the steaming and baking box 1000 and expanding the application range of the steaming and baking box 1000, for example, as shown in fig. 3, the steaming and baking box 1000 may be configured as an embedded steaming and baking box, as shown in fig. 4, or as a desktop type steaming and baking box.

According to the steam oven 1000 provided by the embodiment of the invention, the thick film heating plate 2 is adopted for heating water liquid, so that the steam generator 100 is small in thermal inertia, high in response speed, capable of discharging steam quickly, more uniform in heating and capable of increasing the steam generation amount in a unit area, the operation efficiency of the steam oven 1000 can be improved, and the experience of a user can be improved. Heating cavity 11 through thick film hot plate 2 in to heating cavity 11 and the measurement chamber 12 heats, and the liquid level of measuring chamber 12 is relatively stable to the water liquid heating of measuring chamber 12 not directly to can improve the precision of liquid level detection spare 3, improve the security of steaming and baking oven 1000. The steam generator 100 is disposed on the sidewall of the steam oven 1000, thereby contributing to miniaturization of the steam oven 1000 and expanding the application range of the steam oven 1000.

According to the control method of the steam generator 100 of the embodiment of the present invention, the structure of the steam generator 100 is explained in the above description using the steam generator 100 of the household appliance of the above embodiment, and is not described again. The steam generator 100 includes: after the heating chamber is started, the thick film heating plate 2 is electrified and heated by dry burning, and after the thick film heating plate 2 is heated to reach a first condition, the water inlet driving piece 4 starts to supply water to the heating chamber 11.

According to the control method of the steam generator 100 of the embodiment of the invention, the first condition is set, so that the heating cavity 11 starts to supply water after the thick film heating plate 2 is heated to reach the condition, the heating efficiency of the thick film heating plate 2 is high, and the operation efficiency of the steam generator 100 is improved.

Alternatively, the first condition may be that the temperature of the thick film heater plate 2 reaches 50-200 ℃, preferably, the water-in drive 4 starts to supply water to the heating chamber 11 when the temperature of the thick film heater plate 2 reaches 100 ℃. So that the thick film heating panel 2 can be maintained within a safe range and the heating efficiency can be improved to some extent.

Alternatively, the first condition may be a set time for the thick film heater plate 2 to start or a set amount of electricity to be consumed, and the like, which is not limited herein.

In some embodiments, the level height of the measurement cavity 12 is provided with a first threshold and a second threshold.

When the liquid level detection part 3 detects that the liquid level in the measurement cavity 12 is lower than a first threshold value and does not exceed the first threshold value after self-starting, the water inlet driving part 4 supplies water at a rated flow rate of a first multiplying factor. Here, the rated flow rate is a preset value of the flow rate of the water flowing through the water inlet drive 4, and the specific numerical value of the first multiplying factor is adjusted and set according to the actual operating condition.

When the liquid level detection part 3 detects that the liquid level in the measurement cavity 12 is greater than or equal to a first threshold value and less than or equal to a second threshold value, the water inlet driving part 4 supplies water at a rated flow rate of a second multiplying factor. Here, the specific value of the second magnification is adjusted and set according to the actual working condition.

When the liquid level detection part 3 detects that the liquid level in the measurement cavity 12 is larger than a second threshold value, the water inlet driving part 4 supplies water at a rated flow rate of a third multiplying power. Here, the specific value of the third magnification is adjusted and set according to the actual condition.

When the liquid level detection part 3 detects that the liquid level in the measurement cavity 12 is lower than a first threshold value and exceeds the first threshold value after self-starting, the water inlet driving part 4 supplies water at the rated flow of the fourth multiplying power. Here, the specific value of the fourth magnification is adjusted and set according to the actual condition.

It can be understood that the water consumption rate is different at different stages as time goes by during the operation of the steam generator 100. In order to adapt to the characteristic, the change relation between the water yield consumption speed and the liquid level is summarized, and the water supplement amount can be more accurate by reasonably adjusting each multiplying power through the actual working condition, so that the working efficiency and the safety of the steam generator 100 can be improved, and the dry burning condition caused by the conditions of water shortage and the like or the condition that steam cannot be supplied in time and the like can be reduced.

Alternatively, the second threshold may be 5mm higher than the first threshold, the first magnification may be a magnification greater than 1 time, the second magnification may be a magnification of 0 to 2 times, the third magnification may be a magnification of 0 to 1 time, and the fourth magnification may be a magnification of 0 to 2 times. Specifically, when the liquid level detection member 3 detects for the first time that the liquid level in the measurement chamber 12 is below the first threshold value at the liquid level sensor, water is supplied at a flow rate of the water inlet driving member 4 which is greater than 1 time, preferably 2 times, when the liquid level detection member 3 detects that the liquid level is within ± 5mm around the threshold value, water is supplied at a flow rate of the water inlet driving member 4 which is 0 to 2 times, preferably 1 time, and when the liquid level detection member 3 detects that the liquid level exceeds the first threshold value by 5mm, water is supplied at a flow rate of the water inlet driving member 4 which is 0 to 1 time, preferably 0.5 times. When the level detection member 3 again detects that the level is below the first threshold value, water is supplied at a rate of 0-2 times the rated flow rate of the water inlet drive member 4, preferably 1.5 times.

Optionally, the first threshold is at least higher than the height of the thick film heating plate 2, so that dry burning of the thick film heating plate 2 can be ensured, and safety of the steam generator 100 can be improved.

In the description herein, references to the description of the terms "embodiment," "example," etc., mean 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 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.

While embodiments of the invention have been shown and described, it will be understood by those of ordinary skill in the art that: various changes, modifications, substitutions and alterations can be made to the embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the claims and their equivalents.

Claims

1. A steam generator of a household appliance, characterized by comprising:

the water containing box is internally provided with a heating cavity and a measuring cavity which are communicated, and the water containing box is provided with a water inlet and a steam outlet which are communicated with the heating cavity;

the thick film heating plate is arranged on the water containing box and heats the heating cavity in the heating cavity and the measuring cavity;

the liquid level detection piece is used for detecting the liquid level height in the measuring cavity;

the water inlet is used for inputting water flow into the heating cavity, and the water inlet is electrically connected with the liquid level detection piece.

2. The steam generator of the home appliance according to claim 1, further comprising: the bubble breaking piece is arranged in the heating cavity.

3. The steam generator of the household appliance according to claim 2, wherein the bubble breaking member is a bubble breaking hole plate, the bubble breaking hole plate is located below the steam outlet and above the thick film heating plate, and a plurality of through holes are formed in the bubble breaking hole plate.

4. The steam generator of the home appliance according to claim 1, further comprising: the steam-water separation structure is arranged in the heating cavity, the steam-water separation structure is positioned below the steam outlet and above the thick film heating plate, and the steam-water separation structure constructs a plurality of steam flow channels with the steam outlets converging.

5. The steam generator of the household appliance according to claim 4, wherein the steam-water separation structure comprises a primary steam-water separation structure, the primary steam-water separation structure comprising: the steam flow passage comprises a plurality of flat plates, air gaps are defined between the adjacent flat plates, the baffle is arranged right above or below each air gap, the baffle is connected to one of the flat plates forming the air gaps, and the other flat plate forming the air gaps is matched with the baffle to form the steam flow passage.

6. The steam generator of the household appliance according to claim 4, wherein the steam-water separating structure comprises a secondary steam-water separating structure, the secondary steam-water separating structure comprising: the steam channel is characterized by comprising a plurality of arc-shaped plates arranged in rows, and the adjacent arc-shaped plates define an arc-shaped steam channel.

7. The steam generator of the household appliance according to claim 1, wherein a partition is provided in the water containing box, opposite sides of the partition form the heating chamber and the measuring chamber, a top and a bottom of the partition are spaced apart from a top wall and a bottom wall of the water containing box, respectively, and the steam outlet is provided on the top wall of the water containing box.

8. The steam generator of the home appliance according to claim 1, wherein a mounting hole is formed on a wall of the water containing box, and the thick film heating plate is formed on the mounting hole and constitutes a wall of the heating cavity.

9. The steam generator of the home appliance according to any one of claims 1 to 8, wherein the thick film heating plate comprises:

the substrate is welded and connected to the water containing box;

a heating wire provided on the substrate in a meandering manner;

the steam generator further comprises a temperature detection piece arranged on the substrate, and the temperature detection piece is electrically connected with the water inlet driving piece.

10. A steam oven comprising a steam generator of a household appliance according to any one of claims 1 to 9, said steam generator being provided on a side wall of said steam oven.

11. A control method of a steam generator of a home appliance according to any one of claims 1 to 9, comprising the steps of:

after the heating chamber is started, the thick film heating plate is electrified and heated in a dry burning mode, and after the thick film heating plate is heated to reach a first condition, the water inlet driving piece starts to supply water to the heating chamber.

12. The steam generator control method according to claim 11, wherein a liquid level height of the measurement chamber is provided with a first threshold value and a second threshold value,

when the liquid level detection piece detects that the liquid level in the measurement cavity is lower than the first threshold and does not exceed the first threshold after self-starting, the water inlet driving piece supplies water at the rated flow of a first multiplying power;

when the liquid level detection piece detects that the liquid level in the measurement cavity is greater than or equal to the first threshold value and less than or equal to the second threshold value, the water inlet driving piece supplies water at a rated flow rate of a second multiplying power;

when the liquid level detection piece detects that the liquid level in the measurement cavity is larger than the second threshold value, the water inlet driving piece supplies water at a rated flow of a third multiplying power;

when the liquid level detection piece detects that the liquid level in the measurement cavity is lower than the first threshold value and exceeds the first threshold value after self-starting, the water inlet driving piece supplies water at the rated flow of the fourth multiplying power.