Heating device for cleaning range hood and range hood

Abstract

The utility model relates to a heating device for cleaning a range hood and the range hood, and the heating device comprises a shell, a heating cavity is defined in the shell, and the shell is also provided with a medium inlet and a medium outlet which are communicated with the heating cavity; the heating pipe is arranged in the heating chamber and is used for heating the fluid medium entering the heating chamber; the heating chamber is provided with a chamber top wall, a chamber bottom wall and a chamber side wall connecting the chamber top wall and the chamber bottom wall, the medium inlet and the medium outlet are both formed in the chamber side wall of the heating chamber and are both adjacent to the chamber top wall, the heating pipe is adjacent to the chamber bottom wall, and the medium inlet and the medium outlet are communicated with the heating pipe. A partition plate assembly used for partitioning the heating cavity into a roundabout flow channel is further arranged in the heating cavity, the partition plate assembly comprises a first partition plate, and the first partition plate is opposite to the medium inlet. The device has the advantages that water scales can be effectively intercepted, and blockage of a water flow channel due to excessive concentration of the water scales can be avoided.

Description

Technical Field

[0001] This utility model relates to the field of range hood technology, and in particular to a heating device for cleaning a range hood and a range hood. Background Technology

[0002] A range hood is a kitchen appliance used to purify the kitchen environment. With the continuous advancement of self-cleaning technology, steam cleaning or water cleaning has become widely used in the self-cleaning field of range hoods. The cleaning method is mainly heat cleaning, with the heat medium typically being steam or hot water, or a mixture of steam and hot water. It relies primarily on a heater to generate the hot water or steam. Currently, the main heating method is electric heating element heating, along with PTC heating, thick film heating, and other technologies. Considering factors such as cost and lifespan, electric heating element heating remains the primary heating method in the home appliance industry. Electric heating element heaters, depending on their flow channels, are mainly classified as spiral tube type and die-cast cavity type. The spiral tube type integrates the heating element and spiral tube through a die-casting process, heating the spiral tube through the heating element while water flows through the inside of the spiral tube. However, due to the small volume and cross-sectional area of ​​the spiral tube itself, scale buildup in this type of technology can cause internal blockage, resulting in a shorter heater lifespan. Some also use aluminum die-cast cavity heaters, which use aluminum die-cast cavity to embed electric heating tubes inside the die-cast part to provide heat, and the cavity space is large.

[0003] However, existing cavity-type heaters still have certain shortcomings in practical use: First, there are few measures to prevent scale buildup. Specifically, the placement of the medium inlet and outlet on the cavity is problematic. Most heaters have the medium inlet positioned very low, near the bottom of the cavity, making it easily clogged by scale buildup on the cavity surface, preventing water from entering. The outlet has the same problem, being positioned low or at the edge corner, in areas where scale accumulates at the end of the flow channel, also easily becoming clogged. Second, there are no obstructions at the medium inlet. On the one hand, the water flow rate is relatively fast, resulting in insufficient heating before it flows out, leading to limited temperature. On the other hand, when internal pressure increases and backflow occurs, scale fragments before the medium inlet may be flushed back to the pump outlet, affecting the pump's lifespan. Furthermore, the heater typically only has ribs to lengthen the flow channel internally, without any internal scale-blocking measures. The heater outlet is easily clogged, and since the cleaning medium for range hoods is sprayed from small nozzles, these nozzles are also prone to clogging.

[0004] Therefore, the existing heating devices for cleaning range hoods need further improvement. Utility Model Content

[0005] The first technical problem to be solved by this utility model is to provide a heating device for cleaning range hoods that can effectively intercept scale and avoid blockage of water flow channels due to excessive scale accumulation, in light of the current state of the technology.

[0006] The second technical problem to be solved by this utility model is to provide a heating device for cleaning range hoods that can effectively prevent the medium inlet from being blocked by scale, in light of the current state of the technology.

[0007] The third technical problem to be solved by this utility model is to provide a heating device for cleaning range hoods that can effectively improve heating efficiency, in light of the current state of the technology.

[0008] The fourth technical problem to be solved by this utility model is to provide a range hood that uses the above-mentioned heating device, in view of the current state of the prior art.

[0009] The technical solution adopted by this utility model to solve the first and second technical problems is: a heating device for cleaning range hoods, comprising:

[0010] The housing defines a heating chamber inside, and the housing is also provided with a medium inlet and a medium outlet communicating with the heating chamber;

[0011] A heating tube is arranged in the heating chamber for heating the fluid medium entering the heating chamber;

[0012] The heating chamber has a top wall, a bottom wall, and a side wall connecting the top and bottom walls. The medium inlet and outlet are both located on the side wall of the heating chamber and adjacent to the top wall. The heating tube is located adjacent to the bottom wall. The heating chamber is also equipped with a baffle assembly for dividing the heating chamber into a meandering flow channel. The baffle assembly includes a first baffle, which is opposite to the medium inlet.

[0013] As an improvement, the first baffle extends upward from the bottom wall of the chamber, and its top has a first gap with the top wall of the chamber. Direct connection between the baffle and the top wall of the chamber may obstruct fluid flow and create dead zones. Maintaining a first gap between the top of the first baffle and the top wall of the chamber achieves both flow channel separation and ensures smooth fluid flow through the gap, avoiding local stagnation.

[0014] To prevent the baffle from easily deforming or breaking under fluid impact, the first baffle is provided with a vertically extending first reinforcing rib on the side opposite to the medium inlet. The first reinforcing rib enhances the structural strength of the baffle and improves the durability of the device.

[0015] As an improvement, a first flow port is formed on the first partition or between the first partition and the side wall of the chamber, and the first flow port is offset from the medium inlet. The first flow port guides the fluid to flow alternately on both sides of the partition, enhancing the turbulence effect and improving the heating efficiency.

[0016] To further extend the flow path, the baffle assembly also includes a second baffle, which is closer to the medium outlet than the first baffle. The second baffle has a second gap with the top wall of the chamber, and a second flow port is formed on the second baffle or between the second baffle and the side wall of the chamber. This second flow port is offset from the first flow port. The addition of the second baffle and the offset second flow port creates a multi-stage meandering flow channel, further extending the fluid path and improving thermal energy utilization.

[0017] To further improve the scale interception effect, a first filter screen is also included in the heating chamber. The first filter screen includes a first filter layer and a second filter layer extending laterally along the heating chamber and arranged at an angle at the top. The top of the first filter layer and the second filter layer meet below the top wall of the chamber. The first filter screen intercepts impurities through the angled double-layer filter screen, avoiding clogging, while the inclined structure facilitates impurities to slide to the bottom of the chamber.

[0018] If the distance between the first filter screen and the top wall of the chamber is too large, impurities may escape; if the distance is too small, it is easy for scale to adhere and cause blockage. The distance between the top of the first and second filter screen layers and the top wall of the chamber is 2-5 mm. Using a distance of 2-5 mm can effectively intercept impurities while avoiding blockage due to scale.

[0019] To elevate the first filter screen as much as possible and prevent it from contacting the bottom wall of the chamber and accumulating scale, a first intercepting plate and a second intercepting plate are included. These plates extend upwards from the bottom wall of the heating chamber and are arranged laterally along the heating chamber. The second intercepting plate is positioned closer to the media outlet than the first intercepting plate. The bottom edge of the first filter screen layer is attached to the first intercepting plate. The second filter screen layer is inclined downwards towards the side where the second intercepting plate is located, and its bottom edge is in contact with the bottom wall of the chamber or the side wall of the second intercepting plate. The first and second intercepting plates respectively fix the bottom edges of the double-layer filter screen, enhancing the stability of the filter screen. The inclined second filter screen layer guides impurities to concentrate towards the second intercepting plate.

[0020] To ensure that the first filter screen has a relatively high scale filtration capacity, and to facilitate the installation of the first filter screen, the first filter screen layer extends vertically.

[0021] To prevent unfiltered fluid from escaping if the medium outlet directly faces the flow channel, the middle region of the second interceptor plate in the lateral direction abuts against the top wall of the heating chamber. The height of the two sides of the second interceptor plate in the lateral direction is lower than the height of the middle region, thereby forming two third flow ports. The medium outlet is opposite to the middle region of the second interceptor plate.

[0022] As an improvement, a second filter screen is also provided at the medium outlet. The second filter screen further intercepts impurities, improving the purity of the output medium.

[0023] To effectively increase the filtration area, the second filter screen is an annular filter screen with ports at both ends along its length. One port of the annular filter screen abuts against the outer periphery of the media outlet, and the other port abuts against the sidewall of the central region of the second interceptor plate. The two ends of the annular filter screen abut against the media outlet and the second interceptor plate respectively, forming a stable and fixed structure while maintaining a seal.

[0024] To prevent scale buildup and clogging of the annular filter screen due to contact between its top and bottom and the top and bottom walls of the chamber, a third gap is provided between the annular filter screen and the top wall of the chamber, and the bottom of the annular filter screen is higher than the bottom wall of the chamber.

[0025] To facilitate the cleaning of scale inside the casing, the casing includes a shell body with an open top and a cover that closes to the open top of the shell body. An annular seal is provided between the cover and the top edge of the open top of the shell body. The annular seal ensures a tight seal at the connection between the shell body and the cover.

[0026] As an improvement, the inner wall of the cover has an annular positioning rib. This annular positioning rib is located inside the annular seal and can limit the movement of the cover by engaging with the inner periphery of the top opening of the shell body. The annular positioning rib and the inner periphery of the shell body provide a limiting fit, ensuring precise installation of the cover. The positioning rib, also located inside the top opening of the shell body, prevents air pressure from directly acting on the sealing surface, further ensuring a better seal, especially after scale buildup in the gaps. Simultaneously, the positioning rib also strengthens the cover, preventing bulging and deformation between the screws under pressure.

[0027] As an improvement, a second reinforcing rib is also provided on the inner wall of the cover. The second reinforcing rib is located within the area surrounded by the annular positioning rib and is connected to the second reinforcing rib. The provision of the second reinforcing rib also serves to strengthen the cover, and after connecting with the positioning rib, it can effectively prevent the cover from arching and leaking air.

[0028] As an improvement, the heating tube is integrally disposed within the heating chamber and extends through the partition assembly. The integrated or meandering heating tube layout increases the heating area, improves heat exchange efficiency, and facilitates cleaning and maintenance.

[0029] The technical solution adopted by this utility model to solve the third technical problem is: the heating tube is arranged in a meandering manner.

[0030] To maximize the flow path and facilitate connection to external pipelines, the medium inlet and medium outlet are located on opposite sides of the longitudinal direction of the housing.

[0031] The technical solution adopted by this utility model to solve the fourth technical problem is as follows: a range hood, including a cleaning system, wherein the cleaning system includes a heating device for heating a fluid medium, and the heating device is the above-mentioned range hood cleaning heating device.

[0032] Compared with existing technologies, the advantages of this utility model are as follows: The medium inlet and outlet of the heating chamber are both located on the side wall of the heating chamber and adjacent to the top wall. Raising the medium inlet and outlet as high as possible effectively prevents scale buildup on the lower surface from clogging the medium inlet or concentrating at the outlet. A first baffle is installed in front of the medium inlet to block the fluid entering through it. When using fluid media (such as steam and hot water) for cleaning, the pump needs sufficient pressure and flow to generate impact force. Therefore, even with intermittent fluid supply, the impact at the medium inlet is relatively large when the pump pressure is high. The first baffle prevents the jet from directly impacting the rear end, causing it to flow out before it can be heated (e.g., when the fluid medium is water, insufficient heating may occur during the steam stage, resulting in water output but no steam). Furthermore, when excessive steam causes backflow, the backflow impacts the first baffle, preventing scale buildup from directly affecting the medium inlet and avoiding blockage or scale backflow affecting the pump's lifespan. Attached Figure Description

[0033] Figure 1 This is a three-dimensional structural diagram of the heating device according to an embodiment of the present utility model;

[0034] Figure 2 This is a three-dimensional structural diagram of the heating device according to another embodiment of the present utility model;

[0035] Figure 3 This is a cross-sectional perspective view of the heating device according to an embodiment of the present utility model;

[0036] Figure 4 This is a three-dimensional structural diagram of the heating device according to an embodiment of the present invention, excluding the cover.

[0037] Figure 5 This is a three-dimensional structural diagram of the cover of the heating device according to an embodiment of the present utility model. Detailed Implementation

[0038] The present invention will be further described in detail below with reference to the accompanying drawings and embodiments.

[0039] In the specification and claims of this utility model, terms indicating direction, such as "front," "rear," "upper," "lower," "left," "right," "side," "top," and "bottom," are used to describe various exemplary structural parts and elements of this utility model. However, the use of these terms is merely for the purpose of explanation and is based on the exemplary orientations shown in the accompanying drawings. Since the embodiments disclosed in this utility model can be arranged in different orientations, these terms indicating direction are for illustrative purposes only and should not be regarded as limitations. For example, "upper" and "lower" are not necessarily limited to directions opposite to or consistent with the direction of gravity.

[0040] Figures 1-5 This invention illustrates a preferred embodiment of a heating device for cleaning a range hood and a range hood of the present invention. The range hood includes a housing and a centrifugal fan housed within the housing. The housing generally includes a fan frame and a smoke collection hood located at the bottom of the fan frame, with the inner cavity of the fan frame communicating with the inner cavity of the smoke collection hood. An air inlet is provided on the front side wall of the smoke collection hood, allowing external fumes to enter the hood. The centrifugal fan, located within the fan frame, generates negative pressure during operation, drawing external fumes into the smoke collection hood through the air inlet. An oil filter is also provided at the air inlet of the smoke collection hood for filtering fumes. An oil cup, which is a long, horizontally extending strip, is located at the bottom of the smoke collection hood to collect oil stains flowing down from it.

[0041] Range hoods also include a cleaning system, which can be automatically activated based on actual usage (i.e., a self-cleaning system) or manually activated by the user. The cleaning system typically includes a heating element and a nozzle assembly. The nozzle assembly is connected to a cleaning medium supply device via piping, thus spraying the cleaning medium onto the impeller of the range hood. The cleaning medium is generally steam or hot water, or a mixture of steam and hot water, and is primarily heated by a heater to produce the hot water or steam.

[0042] See Figure 1-3The heating device for cleaning a range hood includes a housing 1 and a heating tube 2. The housing 1 defines a heating chamber 100, with its top wall 102 and bottom wall 101. The top and bottom walls are connected by side walls 103. The housing 1 is generally flat, with a medium inlet 104 and a medium outlet 105 respectively located on the longitudinal side walls 103, both adjacent to the top wall 102. The heating tube 2 is a meandering electric heating tube, integrally die-cast and embedded in the bottom wall 101 of the chamber.

[0043] The housing 1 is generally also equipped with components such as a thermostat 15 and a fuse 16. The live wire is connected to the fuse 16, which is connected to the heating element at one end of the medium inlet 104. The other end of the heating element is connected to the thermostat 15, and the thermostat 15 is connected to the neutral wire to form a power supply line. The specific connection structure and working principle of the thermostat 15 and the fuse 16 are existing technologies and will not be described in detail here.

[0044] See Figure 4 and Figure 5 The housing 1 consists of a housing body 11 and a cover 12. The housing body 11 has an opening at the top, and the cover 12 is fixed to the housing body 11 by screws. A silicone annular seal 13 is provided between the two. Specifically, an annular groove is formed at the top edge of the opening of the housing body 11, and the annular seal 13 is embedded in the annular groove. An annular positioning rib 121 is provided on the inner wall of the cover 12, which limits the positioning to the inner periphery of the opening of the housing body 11. The positioning rib 121 facilitates installation and positioning, making it easy to fit into the screw hole for tightening. In addition, after the screws are tightened, the cover and the sealing ring form a seal. The gap between the positioning rib 121 and the inner periphery of the opening of the housing body 11 also prevents air pressure from directly acting on the sealing plane. Especially after scale forms in the gap later, the sealing performance will be better guaranteed. A second reinforcing rib 122 is also provided on the inner side of the annular positioning rib 121. The aforementioned positioning rib 121 and the second reinforcing rib 122 can both enhance the strength of the cover 12 and prevent the cover 12 from bulging and deforming between the screws after being subjected to pressure.

[0045] The heating chamber 100 is equipped with a partition assembly, including a first partition 31 and a second partition 32. The first partition 31 extends vertically upward from the bottom wall 101 of the chamber, with a first gap 310 of about 5 mm between its top and the top wall 102 of the chamber. The first partition 31 is positioned directly opposite the medium inlet 104, and a vertically extending first reinforcing rib 311 is provided on its side facing away from the medium inlet 104. A first flow port 141 is formed between the first partition 31 and the side wall 103 of the chamber, and the first flow port 141 is longitudinally offset from the medium inlet 104. The second partition 32 is located between the first partition 31 and the medium outlet 105, with its bottom fixed to the bottom wall 101 of the chamber and a second gap 320 reserved between its top and the top wall 102 of the chamber. A second flow port 142 is provided on the side of the second partition 32 near the side wall 103 of the chamber, and it is also longitudinally offset from the first flow port 141 of the housing 1.

[0046] In this embodiment, the medium inlet 104 and medium outlet 105 of the heating chamber 100 are both located on the side wall 103 of the heating chamber 100 and adjacent to the top wall 102 of the chamber. Raising the medium inlet 104 and medium outlet 105 as high as possible effectively prevents scale buildup on the lower surface from clogging the medium inlet 104 or concentrating at the end of the medium outlet 105. A first baffle 31 is provided in front of the medium inlet 104 to block the medium fluid entering through it. When cleaning with a fluid medium (such as steam or hot water), the supply pump needs sufficient pressure and flow to generate impact force. Therefore, even with intermittent supply of the medium fluid, the impact at the medium inlet 104 is relatively large when the supply pump pressure is high. The first baffle 31 prevents the jet from directly impacting the rear end, causing it to flow out before it can be heated in time (e.g., when the fluid medium is water, insufficient heating occurs during the steam stage, resulting in water output but no steam output). On the other hand, when excessive steam volume causes backflow, the backflow impacts the first baffle 31, preventing internal scale from directly affecting the medium inlet 104, thus avoiding blockage of the medium inlet 104 or scale backflow affecting the pump's lifespan. The first baffle 31 can also guide the fluid medium to the side, allowing it to flow through the densely packed heating pipes 2 on the side. This avoids localized dry burning of the heating pipes 2, extends the water flow path, reduces the water flow velocity, and ensures sufficient heating to improve efficiency.

[0047] The media outlet 105 and media inlet 104 can be designed differently, such as with different lengths of the corresponding connecting pipes, to avoid confusion during assembly. The media outlet 105 should also be designed as close to the upper surface as possible to prevent scale buildup and clogging, with a diameter ≥3mm. It should be as large as possible according to usage requirements to avoid long-term scale buildup and clogging. The inner surface of the media outlet 105 should be as smooth as possible; if die-casting conditions do not meet this requirement, secondary machining can be performed. The media outlet 105 should avoid internal corners and other locations prone to scale buildup. For example, in this embodiment, it is placed in the middle of the side, unlike the media inlet 104, which is placed near a corner on the side, as corners at the end of the flow channel are more prone to scale buildup and clogging.

[0048] See Figure 3 and Figure 4 In this embodiment, the second baffle 32 is approximately located in the middle of the longitudinal direction of the housing 1. The main purpose of this second baffle 32 is firstly to intercept scale buildup. Scale buildup is carried by the water flow from the front to the rear end. This second baffle 32 acts as the first barrier against scale buildup, blocking larger scale particles and preventing premature clogging of the rear filter screen, thus extending its lifespan. Secondly, the location of the second baffle 32 during phased water supply creates a rotating flow due to the obstructed water flow, reducing speed, intercepting scale, and improving heating efficiency. The design of the second outlet 142 of the second baffle 32 is to prevent complete interception of water flow and partial dry burning at the rear end when the single water supply during the steam phase is small. It also prevents scale buildup in localized areas (such as on the NTC column), which could affect water temperature readings. The interception height of the second baffle 32 depends on the single water supply volume of the water pump, and the single water supply does not exceed its height.

[0049] The heating chamber 100 is also equipped with a first filter 41, including a first filter layer 411 and a second filter layer 412. The first filter layer 411 is a vertically arranged metal wire mesh, with its bottom attached to the first interceptor plate 33. The second filter layer 412 is inclined from top to bottom towards the second interceptor plate 34 at an angle of up to 30°, and its bottom abuts against the side wall of the second interceptor plate 34. The distance between the top of the first filter layer 411 and the top of the second filter layer 412 and the top wall of the chamber is 1023 mm to 5 mm. Both the first interceptor plate 33 and the second interceptor plate 34 extend upward from the bottom wall 101 of the chamber and are spaced a certain distance from the top wall of the chamber. The bottom of the second filter layer 412 extends as far as possible to the bottom of the second interceptor plate 34, thereby reserving sufficient space in the upper part of the inclined second filter layer 412 to store scale.

[0050] The aforementioned angled double-layer filter screen can be formed by bending woven steel wire mesh. The bottom of the first filter layer 411 is restricted in position by three pairs of slots (corresponding to the top of the first interceptor plate 33). Since the first interceptor plate 33 is designed with a certain height, its main purpose, besides supporting the installation of the first filter screen 41, is to prevent scale buildup. Scale, when flushed to this point, is reduced in flow rate, similar to the corresponding baffles, and intercepted below. Another purpose is to support the double-layer mesh at a certain height, preventing steam-induced water ingress into the filter screen, which would cause scale to quickly form on the filter screen surface, clogging it and preventing airflow at the rear. The height of the first interceptor plate 33 is generally above the height of two water supply cycles, ensuring that a large amount of scale does not form at the rear, as it does not come into contact with a large amount of water. Most of the water is a small amount carried or impacted by steam; this area is only filled with water in hot water mode.

[0051] A second annular filter screen 42 covers the medium outlet 105, with its two ends abutting the outer edge of the medium outlet 105 and the middle area of ​​the second interceptor plate 34, respectively. A third gap 420 of at least 2-3 mm is reserved at the top of the second filter screen 42 to prevent it from contacting the cover 12, thus avoiding scale buildup and air passage later. The mesh size of the second filter screen 42 is adapted to the diameter of the cleaning nozzle orifice, preferably not larger than the nozzle diameter or the smallest size in the heater medium outlet 105.

[0052] The two ends of the second interceptor plate 34 are connected to the side wall 103 of the chamber, thus forming a complete plate blockage. The top of the middle region 341 of the second interceptor plate 34 is flush with the top wall 102 of the chamber, preventing scale from directly flowing to the next stage filter screen, while allowing airflow to enter through the third flow ports 143 on both sides. The notch height of the third flow ports 143 on both sides is about 5mm to prevent excessive pressure at the front end or scale buildup from clogging the channels.

[0053] The cavity sidewall of the housing 1 has a vertically extending first limiting groove 110 corresponding to the medium outlet 105, and the sidewall of the second interceptor plate 34 facing the medium outlet 105 also has a vertically extending second limiting groove 340. The width of the first limiting groove 110 and the second limiting groove 340 is the same as the width of the second filter screen 42. Thus, the second filter screen 42 can be placed in the housing 1 from top to bottom. After being placed in place, the two ends of the second filter screen 42 are respectively limited laterally by the first limiting groove 110 and the second limiting groove 340. The second filter screen 42 can be a triangular, diamond-shaped, or circular mesh, etc. In addition to surrounding the medium outlet 105, it should have a large ventilation area, and its upper surface should not be flat. The lower surface can be supported by ribs and should be as far away from the bottom wall of the cavity as possible to avoid scale buildup on the lower surface, which would cause the filter screen to gradually become clogged, and reduce the contact area between the lower surface and the filter screen.

[0054] During operation, the fluid medium enters the heating chamber 100 through the medium inlet 104. After being blocked by the first baffle 31, it is deflected through the first flow port 141 towards the heating tube 2 area at the bottom of the chamber. Subsequently, it passes through the second flow port 142 and the third flow port 143 (formed by the low-height areas on both sides of the second interceptor plate 34) of the second baffle 32 in sequence, and finally flows out from the medium outlet 105 through the second filter screen 42. In this process, the first filter screen 41 intercepts scale particles, the inclined second filter layer 412 guides impurities to slide to the bottom of the chamber, and the annular filter screen further ensures the cleanliness of the output medium.

[0055] The heating device housing 1 in this embodiment has a four-stage scale interception structure. Specifically, the first stage is the second baffle 32, which intercepts a large amount of scale carried at the front end, reducing the interception pressure on the first filter screen 41. The second stage is a double-layer filter screen (and the first filter screen 41) interception. The first filter layer 411 of the first filter screen 41 intercepts most of the scale at the front end, while the inclined second filter layer 412 intercepts the scale generated below it and the scale that falls off from the inside. The third stage is the second interception plate 34. When scale comes into contact with the second interception plate 34, it is diverted to both sides, preventing scale from falling directly onto the second filter screen 42. At the same time, it blocks and reduces the flow rate, preventing scale from flowing backward. Since the fluid needs to turn 90° from the second filter screen 42 before flowing out, the scale can be further deposited and filtered. The fourth stage is the second filter screen 42. The fluid flows out through the second filter screen 42, which blocks scale, preventing the medium outlet 105 from being blocked by excessive scale accumulation.

[0056] Furthermore, the heating chamber 100 of the heating device in this embodiment must have sufficient scale-holding space. This is to accommodate enough scale to prevent complete internal blockage, and also to prevent the water level from being raised to the medium outlet 105 in a single supply of water when a high-flow-rate water pump intermittently generates steam, thus avoiding water spraying during the steam phase at the nozzle. The designed volume is generally ≥30mL, primarily depending on the overall design life of the device or the total water flow. Simultaneously, when designing internal baffles and interceptor plates, the spacing between connected plates should be no less than 8mm to prevent scale buildup and blockage of the channels.

Claims

1. A heating device for cleaning a range hood, comprising: a housing (1) defining a heating chamber (100) inside, the housing (1) being further provided with a medium inlet (104) and a medium outlet (105) communicating with the heating chamber (100); a heating tube (2) arranged in the heating chamber (100) for heating fluid medium entering the heating chamber (100); characterized in that the heating chamber (100) has a chamber top wall (102), a chamber bottom wall (101) and a chamber side wall (103) connecting the chamber top wall (102) and the chamber bottom wall (101), the medium inlet (104) and the medium outlet (105) are both arranged on the chamber side wall (103) of the heating chamber (100) and are both arranged adjacent to the chamber top wall (102), the heating tube (2) is arranged adjacent to the chamber bottom wall (101), and the heating chamber (100) is further provided with a baffle assembly for partitioning the heating chamber (100) into a meandering flow channel, the baffle assembly comprising a first baffle (31) opposite the medium inlet (104). The first baffle (31) extends upward from the chamber bottom wall (101) and has a first gap (310) with the chamber top wall (102) at the top thereof. The side of the first baffle (31) facing away from the medium inlet (104) is further provided with a first vertical reinforcing rib (311). The first baffle (31) or the space between the first baffle (31) and the chamber side wall (103) forms a first flow port (141) arranged in a staggered manner with the medium inlet (104).

2. The range hood cleaning heating device of claim 1, wherein: The baffle assembly further comprises a second baffle (32) closer to the medium outlet (105) than the first baffle (31), the second baffle (32) has a second gap (320) with the chamber top wall (102), and the second baffle (32) or the space between the second baffle (32) and the chamber side wall (103) forms a second flow port (142) arranged in a staggered manner with the first flow port (141).

3. The range hood cleaning heating device of claim 2, wherein: The heating device further comprises a first filter screen (41) arranged in the heating chamber (100), the first filter screen (41) comprises a first filter screen layer (411) and a second filter screen layer (412) arranged at an angle at the top and extending in the transverse direction of the heating chamber (100), and the position where the top of the first filter screen layer (411) meets the top of the second filter screen layer (412) is lower than the chamber top wall (102).

4. The range hood cleaning heating device of claim 2, wherein: The distance between the position where the top of the first filter screen layer (411) meets the top of the second filter screen layer (412) and the chamber top wall (102) is 2-5 mm.

5. The range hood cleaning heating device of claim 4, wherein: ​ 6. The range hood cleaning heating device of claim 5, wherein: ​ 7. The range hood cleaning heating device of claim 6, wherein: ​ 8. The range hood cleaning heating device of claim 6, wherein: Further comprising a first intercepting plate (33) and a second intercepting plate (34) extending upward from the chamber bottom wall (101) of the heating chamber (100) and arranged along the transverse direction of the heating chamber (100), the second intercepting plate (34) is located closer to the medium outlet (105) than the first intercepting plate (33), the bottom edge of the first filter layer (411) is attached to the first intercepting plate (33), the second filter layer (412) is inclined from top to bottom towards the side where the second intercepting plate (34) is located, and the bottom edge of the second filter layer (412) is connected to the chamber bottom wall (101) or the side wall of the second intercepting plate (34).

9. The range hood cleaning heating device of claim 8, wherein: The first filter layer (411) extends vertically.

10. The range hood cleaning heating device of claim 8, wherein: The middle region of the second intercepting plate (34) in the transverse direction is in contact with the chamber top wall (102) of the heating chamber (100), the height of the two sides of the second intercepting plate (34) in the transverse direction is lower than that of the middle region, thereby forming two third flow passages (143), and the medium outlet (105) is opposite to the middle region of the second intercepting plate (34).

11. The range hood cleaning heating device of claim 9, wherein: The second filter layer (42) is further arranged at the medium outlet (105).

12. The range hood cleaning heating device of claim 11, wherein: The second filter layer is a ring-shaped filter with ports at both ends of the length direction, one port of the ring-shaped filter is in contact with the outer peripheral edge of the medium outlet (105), and the other port is in contact with the side wall of the middle region of the second intercepting plate (34).

13. The range hood cleaning heating device of claim 12, wherein: The ring-shaped filter has a third gap (420) with the chamber top wall (102), and the bottom of the ring-shaped filter is higher than the chamber bottom wall (101).

14. The range hood cleaning heating device according to any one of claims 1-13, wherein: The shell (1) comprises a shell body (11) with an open top and a cover (12) covering the open top of the shell body (11), and an annular sealing member (13) is further arranged between the inner peripheral edge of the open top of the shell body (11) and the cover (12).

15. The range hood cleaning heating device of claim 14, wherein: The inner side wall of the cover (12) has an annular positioning rib (121) which is located inside the annular sealing member (13) and can limit the inner peripheral edge of the open top of the shell body (11).

16. The range hood cleaning heating device of claim 15, wherein: The inner side wall of the cover (12) further has a second reinforcing rib (122) which is located within the range surrounded by the annular positioning rib (121) and is connected to the second reinforcing rib (122).

17. The range hood cleaning heating device of any one of claims 1-13, wherein: The heating pipe (2) is integrally arranged in the heating chamber (100) and penetrates the baffle assembly.

18. The range hood cleaning heating device of any one of claims 1-13, wherein: The heating pipe (2) is arranged in a meandering manner.

19. The range hood cleaning heating device according to any one of claims 1-13, wherein: The medium inlet (104) and the medium outlet (105) are respectively located on opposite sides of the shell (1) in the longitudinal direction.

20. A range hood comprising a cleaning system, the cleaning system comprising a heating device for heating a fluid medium, characterized in that: The heating device adopts the heating device for cleaning a range hood according to any one of claims 1-19.

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