CN110375357B

CN110375357B - Range hood and control method thereof

Info

Publication number: CN110375357B
Application number: CN201910567591.3A
Authority: CN
Inventors: 边乐超; 郑文鑫
Original assignee: Ningbo Fotile Kitchen Ware Co Ltd
Current assignee: Ningbo Fotile Kitchen Ware Co Ltd
Priority date: 2019-06-27
Filing date: 2019-06-27
Publication date: 2021-06-15
Anticipated expiration: 2039-06-27
Also published as: CN110375357A

Abstract

The invention discloses a range hood, which comprises a filtering and purifying assembly, wherein the filtering and purifying assembly comprises a catalytic combustion module, and is characterized in that: the catalytic combustion module comprises a first shell, an adsorption concentration module and a heating catalytic module, wherein the adsorption concentration module and the heating catalytic module are arranged in the first shell, a first opening only allowing oil supply smoke gas flow to flow in and a second opening only allowing oil supply smoke gas flow to flow out are formed in the first shell, and the first opening and the second opening can be opened or closed respectively. The control method of the range hood is further disclosed. Compared with the prior art, the invention has the advantages that: the catalytic combustion module which can be opened and closed is arranged, so that a method of firstly adsorbing and then desorbing catalysis can be realized, pollutants are thoroughly filtered, a heat exchange device with a large volume is omitted, the whole range hood is convenient to miniaturize, the adaptability is improved, and the catalytic combustion module is suitable for various application environments, especially suitable for family kitchens.

Description

Range hood and control method thereof

Technical Field

The invention relates to an oil fume purification device, in particular to a range hood and a control method of the range hood.

Background

Along with the understanding of people on environmental protection, people pay more and more attention to the emission of particulate matters and gaseous pollutants in the air, and the oil fume gas generated by catering cooking also occupies a certain proportion in the emission of the urban gaseous pollutants, so that the purification of catering oil fume and the reduction of the emission pollution of the oil fume are more and more concerned by people.

The existing catering oil fume purification device usually purifies by simply combining some purification technologies, for example, an internal circulation type range hood disclosed in chinese patent with application number 201810804525.9 includes: the filter comprises a shell, a filter cavity is defined in the shell, and the filter cavity is provided with an air inlet and an air outlet which are communicated with an indoor environment; the filter screen assembly is arranged in the filter cavity to filter air entering the filter cavity; the photocatalyst component is arranged in the filtering cavity. The structure can only purify the oil smoke pollutants with larger particle size, but basically has no effect on the oil smoke pollutants with smaller particles and higher smell degree.

The catalytic combustion method can completely catalyze and decompose organic pollutants into water and carbon dioxide, and for this reason, a range hood adopting the catalytic combustion method is available, for example, a combined purification device for filtering restaurant oil smoke and catalyzing with ozone, disclosed in the chinese patent with the application number of 201710977474.5, comprises a purification chamber, a first induced draft fan, a second induced draft fan and an ozone generator; the inside of the purifying chamber is sequentially provided with a catalytic combustion chamber, a first electric heating preheating chamber, a heat exchanger, a ceramic filtering membrane, a second electric heating preheating chamber and a metal filter screen from top to bottom.

Because the catalytic combustion technology needs high concentration of pollutants passing through the catalyst, and the temperature of the catalyst during catalysis is as high as 300 ℃, the cooking and catalytic oxidation are carried out simultaneously, so that the concentration of oil smoke pollutants is not enough (large flow and low concentration), a large amount of energy is consumed, high-temperature gas needs to be cooled and then can be discharged indoors, and a cooling device usually needs a large volume and is not suitable for being used in commercial or household kitchens with small space.

Disclosure of Invention

The first technical problem to be solved by the invention is to provide a range hood aiming at the problems in the prior art, which is convenient for miniaturization and improves the adaptability.

The second technical problem to be solved by the present invention is to provide a control method for the above range hood.

The technical scheme adopted by the invention for solving the first technical problem is as follows: the utility model provides a range hood, includes the filtration purification subassembly, the filtration purification subassembly includes catalytic combustion module, its characterized in that: the catalytic combustion module comprises a first shell, an adsorption concentration module and a heating catalytic module, wherein the adsorption concentration module and the heating catalytic module are arranged in the first shell, a first opening only allowing oil supply smoke gas flow to flow in and a second opening only allowing oil supply smoke gas flow to flow out are formed in the first shell, and the first opening and the second opening can be opened or closed respectively.

In order to open or close the two openings only by the pressure of the oil smoke gas flow, a first check valve is arranged at the first opening, and a second check valve is arranged at the second opening.

Preferably, the adsorption concentration module adopts a zeolite or activated carbon adsorption module.

Preferably, for the convenience of heating gas, catalytic combustion gaseous pollutants, heating catalysis module includes the second casing, be provided with heating member, fan and the attached catalyst piece that has the catalyst in the second casing, be formed with oil smoke entry and oil smoke export on the second casing, heating member, fan and attached catalyst piece are arranged from oil smoke entry to oil smoke export in proper order.

In order to accelerate the gas flow and improve the heating and catalyzing efficiency, the two heating and catalyzing modules are arranged, and the oil smoke inlets and the oil smoke outlets of the two heating and catalyzing modules are reversely arranged, so that convection is formed in the first shell.

In order to improve the filtering efficiency, a graded filtering mode is adopted, the filtering and purifying assembly comprises a first-stage filtering and purifying module for filtering first particles, a second-stage filtering and purifying module for filtering second particles and a third-stage filtering and purifying module for filtering third particles, the first-stage filtering and purifying module, the second-stage filtering and purifying module and the third-stage filtering and purifying module are sequentially arranged from upstream to downstream on an oil smoke flow path, the particle sizes of the first particles, the second particles and the third particles are gradually reduced, and the catalytic combustion module is formed into the third-stage filtering and purifying module.

Preferably, for the position of rational arrangement filtration purification subassembly, including range hood main part and the pipe of discharging fume, air intake and air outlet have been seted up in the range hood main part, the pipe of discharging fume is connected with the air outlet, first order filtration purification module and second level filtration purification module set up in the range hood main part, third level filtration purification module sets up on the pipe of discharging fume.

Preferably, in order to introduce oil smoke into the catalytic combustion module and disconnect the oil smoke, the smoke exhaust pipe comprises a first pipeline and a second pipeline, the first pipeline is connected between the air outlet and the first opening of the catalytic combustion module, and the second pipeline is connected with the second opening of the catalytic combustion module.

In order to facilitate the adsorption of residual gaseous pollutants and realize internal circulation, a fourth-stage filtering and purifying module is arranged at the outlet of the smoke exhaust pipe.

The technical scheme adopted by the invention for solving the second technical problem is as follows: a control method of the range hood is characterized in that: the method comprises the following steps:

1) the range hood normally works, the oil smoke passes through the filtering and purifying assembly, the catalytic combustion module is in an adsorption mode, and gaseous pollutants are adsorbed onto the adsorption and concentration module;

2) after the range hood works for a period of time, the catalytic combustion module opens a desorption catalysis mode:

2.1) stopping the operation of a range hood main body of the range hood, closing a first opening and a second opening of a first shell of a catalytic combustion module, starting a heating catalytic module, sucking and heating an oil fume flow and then discharging the oil fume flow, so that the temperature in the first shell is increased;

2.2) the gaseous pollutants adsorbed on the adsorption concentration module begin to be desorbed and then enter the heating catalytic module for catalytic combustion, and the heat generated by the catalytic combustion is used for maintaining the temperature inside the first shell;

2.3) when the gaseous pollutants adsorbed on the adsorption concentration module are completely catalytically decomposed, the catalytic combustion module stops operating;

2.4) the gas in the first shell is naturally cooled and discharged when the main body of the range hood works next time.

Compared with the prior art, the invention has the advantages that: by arranging the openable and closable catalytic combustion module, the method that the adsorption-oil absorption press stops and then desorbs the catalyst when the range hood works can be realized, so that not only can pollutants be filtered thoroughly, but also a heat exchange device with larger volume is saved, the overall range hood is convenient to miniaturize, the adaptability is improved, and the range hood is suitable for various application environments, particularly suitable for household kitchens; through setting up multistage filtration and purification, according to the particle size of food and beverage oil smoke, contain the component, handle it with different purification methods stage by stage, can make the pollutant in the oil smoke gas stream purified completely, purification efficiency is high, the energy saving, and the equipment maintenance cost is low.

Drawings

FIG. 1 is a schematic view of a range hood according to an embodiment of the present invention;

FIG. 2 is a cross-sectional view of a range hood in accordance with an embodiment of the present invention;

FIG. 3 is a schematic view of a catalytic combustion module of a range hood according to an embodiment of the present invention;

FIG. 4 is a cross-sectional view of a catalytic combustion module of a range hood according to an embodiment of the present invention;

fig. 5 is a cross-sectional view of a heating catalytic module of a catalytic combustion module of a range hood according to an embodiment of the present invention.

Detailed Description

The invention is described in further detail below with reference to the accompanying examples.

Referring to fig. 1 and 2, a range hood includes a range hood main body 1, a smoke exhaust pipe 2 disposed on the range hood main body 1, and a filtering and purifying assembly, the range hood main body 1 includes a smoke collecting hood 11, a box 12 disposed above the smoke collecting hood 11, and a fan 13 disposed in the box 12, the smoke collecting hood 11 is provided with an air inlet 111, the box 12 is provided with an air outlet 121, and the smoke exhaust pipe 2 is used for receiving oil smoke gas flow exhausted from the air outlet 121.

The filtering and purifying assembly comprises a first-stage filtering and purifying module 31 arranged at the air inlet 111, in the embodiment, a double-layer metal oil net is adopted, first particulate matters are removed through a collision method, the particle size of the particulate matters is more than 10 microns, the removal rate can reach 70%, and the oil smoke rate is 1-1.5 m/s.

The filtering and purifying assembly further comprises a second-stage filtering and purifying module 32 arranged between the air inlet 111 and the fan 12, in the embodiment, a UV lamp tube capable of generating ozone is adopted, and second particulate matters are oxidized and decomposed by the generated ozone, the particle size of the particulate matters is 10-2 μm, and the oil smoke speed is 1.5-2 m/s.

The filtering and purifying assembly further comprises a third-stage filtering and purifying module 33 arranged on the smoke exhaust pipe 2 and a fourth-stage filtering and purifying module 34 arranged at the outlet of the smoke exhaust pipe 2. In this embodiment, the third filtering and purifying module 33 is a catalytic combustion module for catalytically combusting third particles, which are gaseous pollutants with a particle size less than 2 μm. The fourth stage filtering and purifying module 34 may adopt an activated carbon composite filter screen to remove the residual gaseous pollutants.

By adopting the range hood, the filtering and purifying assembly can basically remove pollutants in oil smoke gas flow through graded filtering, so that gas passing through the fourth-stage filtering and purifying module 34 can be discharged into a room, and internal circulation is realized.

Referring to fig. 2 to 5, the third stage filtering and purifying module 33 includes a first housing 331, an adsorption concentration module 332 and a heating catalyst module 333 disposed in the first housing 331. The first housing 331 has first and second

opposing openings

3311 and 3312, the first opening 3311 being located upstream of the second opening 3312 in the path of the cooking fumes. The smoke exhaust pipe 2 includes a first pipe 21 and a second pipe 22, wherein the first pipe 21 is connected between the first opening 3311 of the first casing 331 and the air outlet 121 of the range hood body 1, and the second pipe 22 is connected with the second opening 3312 of the first casing 331.

The first opening 3311 is provided with a first check valve 334, and the second opening 3312 is provided with a second check valve 335, wherein the first check valve 334 can only be opened towards the first casing 331, so that the oil fume flow can only be discharged into the first casing 331 from the range hood main body 1, and the second check valve 335 can only be opened towards the second pipeline 22, so that the oil fume flow can only be discharged into the second pipeline 22 from the casing 1.

The adsorption concentration module 332 adopts zeolite or activated carbon adsorption, and the heating catalysis module 333 is arranged at the upstream of the adsorption concentration module 332. The heating catalyst module 333 includes a second housing 3331, a heating member 3332, a fan 3333 and a catalyst attachment block 3334 are provided in the second housing 3331, and opposite ends of the second housing 3331 are opened to form a soot inlet 3335 and a soot outlet 3336 for allowing a flow of soot to pass therethrough. The heating member 3332 may be a resistance wire, and the heating member 3332, the fan 3333 and the catalyst attachment block 3334 are sequentially disposed from the soot inlet 3335 to the soot outlet 3336, and the catalyst attachment block 3334 is used to attach a catalyst, such as a noble metal, thereto. The fan 3333 is preferably an axial flow fan.

At least two heating catalyst modules 333 may be provided, each heating catalyst module 333 extending along the soot flow path, and the two heating catalyst modules 333 are preferably in the same position on the soot flow path. The soot inlet 3335 and the soot outlet 3336 of the two heating and catalyzing modules 333 are oppositely arranged, that is, the soot inlet 3335 of one heating and catalyzing module 333 faces upstream and the soot outlet 3336 faces downstream, while the soot inlet 3335 of the other heating and catalyzing module 333 faces downstream and the soot outlet 3336 faces upstream. Through the arrangement mode, air convection can be enhanced, gas flow in the second shell 3331 is accelerated, and meanwhile heating and catalyzing efficiency is improved. Other arrangements of the two heated catalyst modules 333 are possible, as long as convection is possible.

In the control method of the range hood, the catalytic combustion module adopts a method of adsorption and desorption firstly, and the method comprises the following steps:

1) the range hood normally works, the fan 13 is started, the oil smoke gas flow is sucked from the air inlet 111, and enters the fan 13 after being filtered and purified by the first-stage filtering and purifying module 31 and the second-stage filtering and purifying module 32, in the process, large particle pollutants can be removed by the double-layer metal oil net, the adhesion of the large particle pollutants to the surface of the UV lamp tube is reduced, then the UV lamp tube generates ozone, the gaseous pollutants with smaller particles are oxidized and decomposed, the oil smoke gas flow is pretreated, and the burden on the rear-end catalytic combustion module is reduced; then, the centrifugal action of the fan 13 is used for further separating the particle pollutants in the air, and then when the air passes through the third-stage filtering and purifying module 33, the third particulate matters with small particle sizes are adsorbed on the adsorption concentration module 332 (adsorption mode), and finally, the air is further filtered by the fourth-stage filtering and purifying module 34 and then discharged;

2) after the range hood works for a period of time (which may be a single working period of time, or a plurality of times of accumulated working periods of time, which may be set by a user, or may be determined by detecting the adsorption concentration module 332 through a sensor, at this time, the adsorption concentration module 332 in the third stage filtration and purification module 33 is already approaching saturation, so that the desorption catalysis mode is started, the adsorption concentration module 332 obtains the adsorption capacity again, and the gaseous pollutants are completely decomposed into water and carbon dioxide; specifically, the method comprises the following steps:

2.1) the range hood body 1 of the range hood stops working, the air inlet 111 and the air outlet 121 are closed, the heating catalytic module 333 of the third-stage filtering and purifying module 33 is opened, the heating element 3332 starts heating, the fan 3333 starts to operate, air flow is sucked into the heating catalytic module 333 from the oil fume inlet 3335 and then is exhausted from the oil fume outlet 3336, so that the temperature inside the first shell 331 of the whole third-stage filtering and purifying module 33 rises;

2.2) the gaseous pollutants adsorbed on the adsorption concentration module 332 begin to be desorbed and then enter the heating catalytic module 333 for catalytic combustion, and the heat generated by the catalytic combustion can help to maintain the temperature inside the third stage filtration and purification module 33;

2.3) the convection circulation operation is performed for a period of time, the gaseous pollutants adsorbed on the adsorption concentration module 332 are completely catalyzed and decomposed, and then the third stage filtration and purification module 33 stops operating;

2.4) the gas in the first casing 331 of the third stage filtering and purifying module 33 is slowly and naturally cooled and discharged when the range hood main body 1 works next time.

In the step 2), due to the arrangement of the two check valves, the first opening 3311 and the second opening 3312 of the first casing 331 are closed, so that the inside of the first casing 331 of the third-stage filtering and purifying module 33 is in a substantially closed state to ensure the catalytic combustion, and the oil smoke gas flow can be cooled and then discharged out of the first casing 331 under the pressure of the oil smoke discharged when the range hood main body 1 operates.

Claims

1. The utility model provides a range hood, includes the filtration purification subassembly, the filtration purification subassembly includes catalytic combustion module, its characterized in that: the catalytic combustion module comprises a first shell (331), an adsorption concentration module (332) and a heating catalytic module (333), wherein the adsorption concentration module (332) and the heating catalytic module (333) are arranged in the first shell (331), a first opening (3311) only allowing oil smoke to flow in and a second opening (3312) only allowing oil smoke to flow out are formed in the first shell (331), when the catalytic combustion module is in an adsorption mode, the first opening (3311) and the second opening (3312) are respectively in an open state, and when the catalytic combustion module is in a desorption catalytic mode, the first opening (3311) and the second opening (3312) are respectively in a closed state to enable the first shell (331) to be closed; the heating catalytic module (333) comprises a second shell (3331), wherein a lampblack inlet (3335) and a lampblack outlet (3336) are formed in the second shell (3331), the number of the heating catalytic module (333) is two, and the lampblack inlet (3335) and the lampblack outlet (3336) of the two heating catalytic modules (333) are reversely arranged, so that convection is formed in the first shell (331).

2. The range hood of claim 1, wherein: a first check valve (334) is arranged at the first opening (3311), and a second check valve (335) is arranged at the second opening (3312).

3. The range hood of claim 1, wherein: the adsorption concentration module (332) adopts a zeolite or activated carbon adsorption module.

4. The range hood of claim 1, wherein: the oil smoke exhaust ventilator is characterized in that a heating element (3332), a fan (3333) and a catalyst attachment block (3334) attached with a catalyst are arranged in the second shell (3331), and the heating element (3332), the fan (3333) and the catalyst attachment block (3334) are sequentially arranged from an oil smoke inlet (3335) to an oil smoke outlet (3336).

5. The range hood of claim 1, wherein: the filtering and purifying assembly comprises a first-stage filtering and purifying module (31) for filtering first particles, a second-stage filtering and purifying module (32) for filtering second particles and a third-stage filtering and purifying module (33) for filtering third particles, wherein the first-stage filtering and purifying module (31), the second-stage filtering and purifying module (32) and the third-stage filtering and purifying module (33) are sequentially arranged from upstream to downstream on an oil smoke flow path, the particle sizes of the first particles, the second particles and the third particles are gradually reduced, and the catalytic combustion module is formed into the third-stage filtering and purifying module (33).

6. The range hood of claim 5, wherein: including range hood main part (1) and pipe (2) of discharging fume, air intake (111) and air outlet (121) have been seted up on range hood main part (1), pipe (2) of discharging fume is connected with air outlet (121), first order filtration purification module (31) and second level filtration purification module (32) set up on range hood main part (1), third level filtration purification module (33) set up on pipe (2) of discharging fume.

7. The range hood of claim 6, wherein: the smoke exhaust pipe (2) comprises a first pipeline (21) and a second pipeline (22), the first pipeline (21) is connected between the air outlet (121) and a first opening (3311) of the catalytic combustion module, and the second pipeline (22) is connected with a second opening (3312) of the catalytic combustion module.

8. The range hood of claim 6, wherein: and a fourth-stage filtering and purifying module (34) is arranged at the outlet of the smoke exhaust pipe (2).

9. A control method of a range hood according to any one of claims 1 to 8, characterized in that: the method comprises the following steps:

1) the range hood normally works, the oil smoke passes through the filtering and purifying assembly, the catalytic combustion module is in an adsorption mode, and the gaseous pollutants are adsorbed to the adsorption and concentration module (332);

2.1) the range hood main body (1) of the range hood stops working, the first opening (3311) and the second opening (3312) of the first shell (331) of the catalytic combustion module are closed, the heating catalytic module (333) is opened, and the oil fume flow is sucked, heated and discharged, so that the temperature in the first shell (331) rises;

2.2) the gaseous pollutants adsorbed on the adsorption concentration module (332) begin to be desorbed and then enter the heating catalytic module (333) for catalytic combustion, and the heat generated by the catalytic combustion is used for maintaining the temperature inside the first shell (331);

2.3) when the gaseous pollutants adsorbed on the adsorption concentration module (332) are completely catalytically decomposed, the catalytic combustion module stops operating;

2.4) the gas in the first shell (331) is naturally cooled and discharged when the range hood main body (1) works next time.