Flue sealing device and range hood

Abstract

The flue sealing device comprises a flue allowing flue gas to pass through, the flue comprises a sealing channel, the sealing channel comprises a first channel section and a second channel section, the first channel section and the second channel section form an included angle, and a partition plate extending in the length direction of the second channel section is further arranged in the second channel section. One end of the top of the partition plate and two opposite side edges in the width direction of the partition plate are connected with the inner wall of the second channel section, and the inner space of the second channel section is divided into a ventilation section for discharging smoke and a liquid passing section for flowing of sealing liquid; a bottom port of the ventilation section and a bottom port of the liquid passing section are both communicated with the bottom of the first channel section, one end of the top of the liquid passing section is not communicated with the ventilation section, and a ventilation opening communicated with the liquid passing section and the external atmosphere is further formed in the position, corresponding to one end of the top of the liquid passing section, of the bottom wall of the second channel section. The smoke exhaust device has the advantages that smoke can be automatically exhausted, and the sealing reliability of the flue can be effectively guaranteed.

Description

Technical Field

[0001] The present invention relates to the technical field of range hoods, and in particular to a flue sealing device and a range hood. Background Art

[0002] The buildings in which families live nowadays generally use public flues. The oil fumes exhausted from the range hoods of each household enter the public flue from the range hood and are discharged from above the house. If the air outlet of the range hood is not tightly sealed, the oil fumes of the lower-level users will enter the rooms of the upper-level residents during the exhaust process. Or when there is a strong wind or low air pressure, the oil fumes exhausted from the upper-level residents will enter the houses from the exhaust ports of the range hoods of the lower-level residents, resulting in the phenomenon of air and smoke cross-talk between airways. Therefore, general range hoods are provided with an air outlet hood at the air outlet of the range hood, and a valve is provided in the air outlet hood. The valve is usually opened when the range hood is in use to exhaust the oil fumes to the public flue, and the valve is also closed when the range hood is turned off to prevent the oil fumes in the public flue from flowing back. For example, the Chinese patent authorization publication number CN202158233U, “A range hood check valve”, and the Chinese invention patent application number CN201210423898.4, “Air outlet hood of range hood with auxiliary valve plate for quick opening”, both disclose this type of check valve structure for preventing oil fume backflow.

[0003] However, the mechanical check valve sealing structure in the above patent application still has certain shortcomings: since the valve plate in the air outlet hood is in contact with oil smoke for a long time, it is often difficult to open or opens poorly due to the adhesion of oil smoke. On the other hand, since most valve plates use peripheral sealing gaskets to achieve compression sealing, it is inevitable that local sealing is not tight when using sealing gaskets for sealing, and it is easy to be damaged over time, requiring regular inspection and maintenance, which is costly. Summary of the invention

[0004] The first technical problem to be solved by the present invention is to provide a flue sealing device which can automatically exhaust smoke and effectively ensure the reliability of flue sealing in view of the current status of the prior art.

[0005] The second technical problem to be solved by the present invention is to provide a range hood using the above-mentioned flue sealing device in view of the current status of the prior art.

[0006] The technical solution adopted by the present invention to solve the first technical problem is: a flue sealing device, including a flue for smoke to pass through, the flue including a sealed channel for storing a sealing liquid, the sealed channel including a first channel section and a second channel section which are connected in sequence along the direction of smoke flow and arranged at an angle, the bottom of the first channel section is connected to the bottom of the second channel section, and the second channel section is also provided with a partition extending along the length direction of the second channel section, the top end of the partition and the two opposite sides in the width direction are connected to the inner wall of the second channel section, and the internal space of the second channel section is divided into a ventilation section for smoke exhaust and a liquid passage section for sealing liquid flow, the bottom port of the ventilation section and the bottom port of the liquid passage section are both connected to the bottom of the first channel section, the top end of the liquid passage section is not connected to the ventilation section, and a ventilation port connecting the liquid passage section with the external atmosphere is also opened on the bottom wall of the second channel section at a position corresponding to the top end of the liquid passage section.

[0007] In order to ensure the sealing effect and reduce the amount of sealing liquid, the first ventilation section extends vertically, and the second ventilation section extends upwardly at an angle from the bottom of the first ventilation section. The "vertical" in the vertical extension of the first ventilation section is not limited to the vertical extension of the first ventilation section, and it can also be slightly inclined relative to the vertical direction (such as the inclination angle is within 5°). In addition, it is conceivable that the second ventilation section can also be extended vertically.

[0008] In order to better exhaust smoke through the ventilation section, the liquid passage section in the second ventilation section is located below the ventilation section.

[0009] In order to further reduce the amount of sealing liquid, the inclination angle formed by the second ventilation section relative to the vertical direction is α, and the value range of α is: 0°<α≤75°.

[0010] As an improvement, the volume of the sealing liquid in the sealing channel is configured as follows:

[0011] In the initial state, the sealing liquid in the sealing channel disconnects the first channel section from the second channel section;

[0012] In the working state, the sealing liquid in the sealing channel can enter the liquid passage section under the action of the smoke pressure in the flue, so that the first channel section is connected with the ventilation section.

[0013] The above-mentioned "initial state" should be understood as the range hood device (such as a range hood or other products with the function of extracting and exhausting range fumes) being in a non-operating state; and the above-mentioned "working state" should be understood as the operating condition in which the fan system of the range hood device is in the lowest gear mode.

[0014] In order to reduce the cost, the sealing liquid is water. Of course, it is conceivable that the sealing liquid can also be other liquids that are not volatile and not flammable, such as silicone oil.

[0015] In order to detect the flue gas pressure in the flue and reduce costs, it also includes a first liquid level sensor arranged in the first channel section to detect the liquid level height of the sealing liquid in the second channel section, a second liquid level sensor arranged in the liquid-passing section to detect the liquid level height of the sealing liquid in the liquid-passing section, and a processing unit electrically connected to the above-mentioned first liquid level sensor and second liquid level sensor, and the processing unit calculates the flue gas pressure in the flue according to the liquid level signals transmitted by the first liquid level sensor and the second liquid level sensor.

[0016] Taking into account that each time air flows through the flue, some sealing liquid will inevitably be brought out and the sealing liquid will volatilize, the liquid in the flue will become less and less, eventually leading to sealing failure. If the sealing liquid is directly replenished, it will be too frequent and costly, causing trouble to users. For this reason, a liquid replenishing device for replenishing the sealing liquid into the sealed channel is also included. The liquid replenishing device includes a liquid storage tank, and the bottom of the liquid storage tank is connected to the sealed channel through an infusion tube. The infusion tube is also provided with a one-way valve for allowing the sealing liquid to enter the sealed channel in one direction.

[0017] As an improvement, in order to achieve automatic replenishment of the sealing liquid, the one-way valve is configured to open when the pressure difference between the liquid in the liquid storage tank and the liquid in the sealing channel reaches a set value, and close when it is less than the set value.

[0018] In order to promptly remind the user to check the situation where the amount of sealing liquid is reduced due to failure to replenish the liquid in time, an alarm device electrically connected to the first liquid level sensor and the second liquid level sensor is also included. The alarm device is configured to send out an alarm reminder when the liquid level detected by the first liquid level sensor is the same as the liquid level detected by the second liquid level sensor and both are less than the set liquid level. The above-mentioned "set liquid level" can generally be understood as when the sealing liquid is less than this liquid level, it means that the volume of the sealing liquid in the sealing channel is insufficient, resulting in sealing failure.

[0019] The technical solution adopted by the present invention to solve the second technical problem is: a range hood, comprising a casing and a fan system arranged in the casing, the casing having an air outlet connected to the fan system, the air outlet being connected to an external flue, and the flue being provided with the above-mentioned flue sealing device.

[0020] Compared with the prior art, the advantages of the present invention are as follows: since the first channel section and the second channel section of the sealing channel are connected at the bottom and arranged at an angle, when the front end range hood (or other range hood extraction device) is not working, due to the presence of sealing liquid in the sealing channel, a good seal can be achieved at the bottom connecting position of the first channel section and the second channel section, that is, the range hood is isolated from the gas in the external flue, so that the airflow with odor in the external flue will not flow back into the range hood when the range hood stops working, thereby improving the user experience. When the range hood is turned on, due to the pressure of the fan system of the range hood, the sealing liquid will be pressed into the liquid passage section on one side of the partition (the top end of the liquid passage section is connected to the outside atmosphere), and the ventilation section is connected to the first channel section of the flue, so that the smoke can be discharged normally, and when the range hood is turned off, the sealing liquid is reset to the initial state under the action of its own weight, and the liquid seal is achieved again. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 A schematic diagram of the three-dimensional structure of a flue sealing device according to an embodiment of the present invention;

[0022] Figure 2 It is a structural schematic diagram of a range hood with a flue sealing device applied thereto according to an embodiment of the present invention;

[0023] Figure 3 is a cross-sectional view of a flue sealing device according to an embodiment of the present invention (in a sealed state);

[0024] Figure 4 2. It is a cross-sectional view of a flue sealing device according to an embodiment of the present invention (in an open ventilation state). DETAILED DESCRIPTION

[0025] The present invention is further described in detail below with reference to the accompanying drawings.

[0026] In the specification and claims of the present invention, terms indicating directions, such as "front", "rear", "up", "down", "left", "right", "side", "top", "bottom", etc., are used to describe various exemplary structural parts and elements of the present invention, but these terms are used here only for the purpose of convenience of description and are determined based on the exemplary orientations shown in the accompanying drawings. Since the embodiments disclosed in the present invention can be arranged in different directions, these terms indicating directions are only used as explanations and should not be regarded as limitations. For example, "up" and "down" are not necessarily limited to directions opposite to or consistent with the direction of gravity.

[0027] Figure 1-Figure 4A preferred embodiment of the flue sealing device and the range hood of the present invention is shown. The flue sealing device includes a flue, a flue pressure detection device and a liquid replenishing device 30. The flue includes a sealed channel for storing a sealing liquid, and the sealed channel includes a first channel section 11 and a second channel section 12 which are connected in sequence along the flue gas flow direction and arranged at an angle. The bottom of the first channel section 11 is connected to the bottom of the second channel section 12, so that the sealed channel is U-shaped or V-shaped as a whole. After a sufficient amount of sealing liquid is filled in the sealed channel, a section where the bottom of the first channel section 11 and the bottom of the second channel section 12 are connected can be sealed to separate the first channel section 11 from the second channel section 12, so as to prevent the airflow with odor in the external flue from flowing back into the range hood when the range hood stops working.

[0028] In order to enable the sealing liquid to release the state of isolating the first channel section 11 and the second channel section 12 when the range hood is in operation, a partition 13 extending along the length direction of the second channel section 12 is also provided in the second channel section 12. The top end of the partition 13 and the two opposite sides in the width direction are connected to the inner wall of the second channel section 12, and the internal space of the second channel section 12 is divided into a ventilation section 121 for smoke exhaust and a liquid passage section 122 for the sealing liquid to flow. The end edge of the bottom end of the partition 13 is not connected to the inner wall of the first channel section 11 or the second channel section 12, that is, the bottom port of the ventilation section 121 and the bottom port of the liquid passage section 122 are both connected to the bottom of the first channel section 11. Since the end edge of the top end of the partition 13 is connected to the inner wall of the second channel section 12, the top end of the liquid passage section 122 is not connected to the ventilation section 121, wherein the ventilation section 121 serves as the main passage for smoke exhaust. The bottom wall of the second channel section 12 is provided with a vent 120 for connecting the liquid-passing section 122 with the outside atmosphere at a position corresponding to the top end of the liquid-passing section 122. When the range hood is turned on, due to the pressure of the fan system of the range hood, the liquid level of the sealing liquid in the first channel section 11 gradually decreases, and is specifically pressed into the liquid-passing section 122 on one side of the partition 13 (because the top end of the liquid-passing section 122 is connected to the outside atmosphere). After the liquid level of the sealing liquid in the first channel section 11 decreases to the corresponding position (determined by the current flue gas pressure and the volume of the sealing liquid), the vent section 121 is connected to the first channel section 11 of the flue, and the flue gas can be discharged normally. Of course, in the process of discharging the flue gas, when the flue gas pressure continues to increase, the sealing liquid will continue to be pressed into the liquid-passing section 122 on one side of the partition 13, and the liquid level of the sealing liquid in the first channel section 11 will decrease to a lower position. When the range hood is turned off, the sealing liquid returns to its initial state under the action of its own weight, thus achieving liquid sealing again.

[0029] The design of the flue sealing structure enables the ventilation section 121 and the liquid section 122 separated by the partition 13 to form a "secondary communicating vessel" structure in the sealed channel. In this case, the sealing liquid does not need to be additionally provided with a pumping device for external discharge. When the range hood is running, the sealing liquid will automatically enter the liquid section 122 under the smoke pressure in the flue to connect the first channel section 11 with the ventilation section 121 to achieve automatic smoke exhaust. When the range hood is turned off, the sealing liquid is reset to the initial state under its own weight, and liquid sealing is achieved again, effectively ensuring the reliability of the flue sealing.

[0030] See also Figure 3 , the first ventilation section 121 of this embodiment extends vertically, and the second ventilation section 121 extends obliquely upward from the bottom of the first ventilation section 121. Among them, the liquid-passing section 122 in the second ventilation section 121 is located below the ventilation section 121, thereby ensuring that the sealing liquid can enter the liquid-passing section 122 and the smoke in the flue can be discharged through the ventilation section 121. The "vertical" in the vertical extension of the above-mentioned first ventilation section 121 is not limited to the vertical extension of the first ventilation section 121, and it can also be slightly inclined relative to the vertical direction (such as the inclination angle is within 5°). In a preferred embodiment, in order to further reduce the amount of sealing liquid and reduce the space occupied by the sealing channel due to the slow turning angle, the first ventilation section 121 extends vertically, and the inclination angle formed by the second ventilation section 121 relative to the vertical direction is α, and the value range of α is: 0°<α≤75°, preferably, α is 60°.

[0031] The sealing liquid for achieving liquid sealing in the sealing channel can be water or other non-volatile and non-flammable liquids (such as silicone oil, etc.). In order to reduce costs, water is used as the sealing liquid.

[0032] The volume of the sealing liquid in the sealing channel can be reasonably set according to the turning angle of the sealing channel and the smoke pressure at each gear during the operation of the range hood. Specifically, it should at least meet the following requirements: the amount of the sealing liquid cannot be too small. In the initial state, the sealing liquid in the sealing channel disconnects the first channel section 11 from the second channel section 12. If the volume of the sealing liquid is too small, it cannot play a sealing role. The volume of the sealing liquid cannot be too large either. In the working state, the sealing liquid in the sealing channel can enter the liquid passage section 122 under the action of the smoke pressure in the flue, and connect the first channel section 11 with the ventilation section 121 to effectively exhaust smoke. If the amount of the sealing liquid is too much, the sealing liquid cannot effectively enter the liquid passage section 122 under the smoke pressure, and connect the ventilation section 121 with the first channel section 11, and ensure the ventilation volume of the smoke exhaust channel after the two are connected. The above-mentioned "initial state" should be understood as the range hood device (such as a range hood or other products with the function of extracting and exhausting range fumes) being in a non-operating state; and the above-mentioned "working state" should be understood as the operating condition in which the fan system of the range hood device is in the lowest gear mode.

[0033] The flue pressure detection device of this embodiment detects the flue gas pressure in the flue on the basis of the above-mentioned sealed channel structure, so as to achieve the purpose of reducing costs. The flue pressure detection device also includes a first liquid level sensor 21 arranged in the first channel section 11 to detect the liquid level height of the sealing liquid in the second channel section 12, a second liquid level sensor 22 arranged in the liquid-passing section 122 to detect the liquid level height of the sealing liquid in the liquid-passing section 122, and a processing unit electrically connected to the above-mentioned first liquid level sensor 21 and the second liquid level sensor 22. The above-mentioned first liquid level sensor 21 and the second liquid level sensor 22 can both adopt capacitive liquid level sensors, which are attached to the inner walls of the first channel section 11 and the liquid-passing section 122, wherein the working principle and installation method of the capacitive liquid level sensor are both existing technologies and will not be repeated here. The above-mentioned processing unit calculates the flue gas pressure in the flue according to the liquid level signals transmitted by the first liquid level sensor 21 and the second liquid level sensor 22. Specifically, by converting the height difference of the liquid levels on both sides, the pipeline pressure P = ρg(H2-H1) can be obtained, wherein ρ is the density of the sealing liquid, and H2-H1 represents the height difference of the liquid levels on both sides.

[0034] Considering that every time air flows through the flue, some sealing liquid will inevitably be brought out and the sealing liquid will volatilize, the liquid in the flue will become less and less, eventually leading to sealing failure. If the sealing liquid is directly replenished, it will be too frequent and costly, causing trouble to the user. Therefore, the flue sealing device of this embodiment is also provided with a liquid replenishing device 30 to replenish the sealing liquid in the sealing channel. Figure 3As shown, the liquid replenishing device 30 includes a liquid storage tank 31 for storing the sealing liquid, the bottom of the liquid storage tank 31 is connected to the sealing channel through a liquid infusion tube 32, and a one-way valve 33 is also provided on the liquid infusion tube 32 for the sealing liquid to enter the sealing channel in one direction. Among them, the one-way valve 33 can adopt a conventional spring-type one-way valve 33, which is configured to open when the pressure difference between the liquid in the liquid storage tank 31 and the liquid in the sealing channel reaches a set value, and close when it is less than the set value. In this way, when the liquid in the sealing channel is insufficient, automatic liquid replenishment of the sealing liquid can be achieved.

[0035] The position where the sealing channel is connected to the liquid infusion pipe 32 is located at the bottom of the position where the first channel section 11 and the second channel section 12 are connected. In this way, when the range hood is in the shutdown state or the running state, the two sections of the liquid infusion pipe 32 located upstream and downstream of the one-way valve 33 are filled with sealing liquid. When the airflow passes through, due to the effect of the one-way valve 33 structure, the liquid inside the sealing channel will not flow to the liquid storage tank 31. When the airflow stops, due to the effect of the pressure difference, the sealing liquid in the liquid storage tank 31 will eventually reach a pressure steady state with the sealing liquid in the sealing channel. As a result, the sealing liquid is replenished, so that the volume of the sealing liquid in the sealing channel is within a reasonable range. Of course, the volume of the sealing liquid in the liquid storage tank 31 also needs to be maintained within a relatively appropriate range, such as regularly replenishing a certain amount of sealing liquid into the liquid storage tank 31, or automatically replenishing it by cooperating with other liquid level recognition devices.

[0036] Of course, it is possible that the sealing liquid in the liquid storage tank 31 cannot be replenished in the sealing channel in time (such as the one-way valve 33 is stuck and fails, etc.). In order to remind the user in time to check the situation of the reduction of the sealing liquid amount caused by the failure to replenish the liquid in time, the flue sealing device of this embodiment also includes an alarm device electrically connected to the first liquid level sensor 21 and the second liquid level sensor 22. The alarm device is configured to: when the liquid level detected by the first liquid level sensor 21 is the same as the liquid level detected by the second liquid level sensor 22, and both are less than the set liquid level, the alarm device issues an alarm reminder. The above-mentioned "set liquid level" can generally be understood as when the sealing liquid is less than the liquid level, it means that the volume of the sealing liquid in the sealing channel is insufficient, resulting in sealing failure. The alarm reminder can be achieved by issuing "sound and / or light signal" (such as playing sound through a speaker, and the warning light flashing). After the alarm signal is issued, the user can detect whether the replenishment process of the replenishment device 30 fails. Of course, after the replenishment device 30 replenishes the sealing liquid, when the liquid level in the sealing channel exceeds the minimum height, the alarm will stop.

[0037] Since the first channel section 11 and the second channel section 12 of the sealing channel are connected at the bottom and arranged at an angle, when the range hood (or other range hood device) at the front end is not working, due to the presence of sealing liquid in the sealing channel, a good seal can be achieved at the bottom connecting position of the first channel section 11 and the second channel section 12, that is, the range hood is isolated from the gas in the external flue, so that the airflow with odor in the external flue will not flow back into the range hood when the range hood stops working, thereby improving the user experience. When the range hood is turned on, due to the pressure of the fan system of the range hood, the sealing liquid will be pressed into the liquid passage section 122 on one side of the partition 13 (the top end of the liquid passage section 122 is connected to the outside atmosphere), and the ventilation section 121 is connected to the first channel section 11 of the flue, so that the smoke can be discharged normally, and when the range hood is turned off, the sealing liquid is reset to the initial state under its own weight, and the liquid seal is achieved again.

[0038] The present embodiment also relates to a range hood, which includes a housing 40 and a fan system disposed in the housing 40. The housing 40 has an air outlet connected to the fan system, and the air outlet is connected to an external flue, and the flue is provided with the above-mentioned flue sealing device. It can be imagined that the flue sealing device of the present embodiment is not only applicable to range hoods, but also applicable to other range hood devices or products with the function of absorbing and exhausting oil smoke, such as integrated stoves, etc.

Claims

1. A flue sealing device, characterized in that: The invention comprises a flue for flue gas to pass through, the flue gas comprising a sealed channel for storing a sealing liquid, the sealed channel comprising a first channel section (11) and a second channel section (12) which are connected in sequence along the flue gas flow direction and arranged at an angle, the bottom of the first channel section (11) is connected to the bottom of the second channel section (12), the second channel section (12) is further provided with a partition (13) extending along the length direction of the second channel section (12), the top end of the partition (13) and two opposite sides in the width direction are connected to the inner wall of the second channel section (12), The internal space of the second channel section (12) is divided into a ventilation section (121) for exhausting smoke and a liquid passage section (122) for flowing a sealing liquid. The bottom port of the ventilation section (121) and the bottom port of the liquid passage section (122) are both connected to the bottom of the first channel section (11), and the top end of the liquid passage section (122) is not connected to the ventilation section (121). A ventilation port (120) for connecting the liquid passage section (122) with the external atmosphere is also provided on the bottom wall of the second channel section (12) at a position corresponding to the top end of the liquid passage section (122).

2. The flue sealing device according to claim 1, characterized in that: The first channel section (11) extends vertically, and the second channel section (12) extends obliquely upward from the bottom of the first channel section (11).

3. The flue sealing device according to claim 2, characterized in that: The liquid passage section (122) in the second channel section (12) is located below the ventilation section (121).

4. The flue sealing device according to claim 2, characterized in that: The inclination angle formed by the second channel section (12) relative to the vertical direction is α, and the value range of α is: 0°<α≤75°.

5. The flue sealing device according to claim 1, characterized in that: The volume of the sealing liquid in the sealing channel is configured as follows: In an initial state, the sealing liquid in the sealing channel disconnects the first channel section (11) from the second channel section (12); In the working state, the sealing liquid in the sealing channel can enter the liquid passage section (122) under the action of the smoke pressure in the flue, thereby connecting the first channel section (11) with the ventilation section (121).

6. The flue sealing device according to claim 1, characterized in that: The sealing liquid is water.

7. The flue sealing device according to any one of claims 1 to 6, characterized in that: The invention also comprises a first liquid level sensor (21) arranged in the first channel section (11) to detect the liquid level height of the sealing liquid in the second channel section (12), a second liquid level sensor (22) arranged in the liquid-passing section (122) to detect the liquid level height of the sealing liquid in the liquid-passing section (122), and a processing unit electrically connected to the first liquid level sensor (21) and the second liquid level sensor (22), wherein the processing unit calculates the flue gas pressure in the flue according to the liquid level signals transmitted by the first liquid level sensor (21) and the second liquid level sensor (22).

8. The flue sealing device according to claim 7, characterized in that: The invention also comprises a liquid replenishing device (30) for replenishing the sealing liquid into the sealing channel, wherein the liquid replenishing device (30) comprises a liquid storage tank (31), the bottom of the liquid storage tank (31) is connected to the sealing channel via a liquid infusion tube (32), and the liquid infusion tube (32) is also provided with a one-way valve (33) for allowing the sealing liquid to enter the sealing channel in one direction.

9. The flue sealing device according to claim 8, characterized in that: The one-way valve (33) is configured to open when the pressure difference between the liquid in the liquid storage tank (31) and the liquid in the sealed channel reaches a set value, and to close when the pressure difference is less than the set value.

10. The flue sealing device according to claim 7, characterized in that: It also comprises an alarm device electrically connected to the first liquid level sensor (21) and the second liquid level sensor (22), the alarm device being configured to issue an alarm reminder when the liquid level detected by the first liquid level sensor (21) is the same as the liquid level detected by the second liquid level sensor (22) and both are less than a set liquid level.

11. A range hood, comprising a housing (40) and a fan system arranged in the housing (40), wherein the housing (40) has an air outlet connected to the fan system, and the air outlet is connected to an external flue, characterized in that: The flue is provided with a flue sealing device according to any one of claims 1 to 10.

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