A gas purification device

Abstract

The present invention discloses a gas purification device, which includes a housing, and an air inlet and an air outlet are provided on the housing; an activated carbon purification mechanism is arranged in the housing, and the activated carbon purification mechanism includes an activated carbon layer and a temperature control component for controlling the temperature of the activated carbon layer. When the gas to be treated flowing through the housing passes through the activated carbon layer for adsorption and purification treatment, the temperature control component controls the activated carbon layer to be at a first temperature, and the first temperature is higher than the dew point temperature of the gas to be treated. The gas purification device of the present invention utilizes activated carbon to adsorb and purify gas when the temperature is higher than the dew point, which can effectively avoid condensation of the humid gas when passing through the activated carbon layer, avoid the liquid generated by condensation from blocking the micropores of the activated carbon layer, ensure that the activated carbon layer has good adsorption activity and smoothness, and ensure the purification effect.

Description

Technical Field

[0001] The present invention relates to the technical field of gas purification treatment, and particularly to a gas purification device. Background Art

[0002] In daily production and life, there are many activity scenarios that generate harmful gases. The direct emission of harmful gases causes serious environmental pollution. Therefore, it is usually necessary to purify the gas to reduce pollution and meet the requirements of green environmental protection. Cooking is an important part of daily life. Cooking generates a large amount of fumes. Fumes are the products of volatilized oils, organic substances and their heating decomposition or cracking during food cooking and processing. They are a mixture generated by a series of reactions of cooking oil and food at high temperatures. Fume gas contains a variety of toxic and harmful components, and the components are very complex. There are both organic fumes generated by the physical and chemical reactions of oils, proteins and raw materials and seasonings under heating conditions, and there are also high-molecular compounds formed by the decomposition, oxidation and polymerization of liquid droplets splashing and oil materials decomposing during the heating operation. Therefore, the existing state includes both suspended particulate matter and gaseous organic pollutants, which are mainly divided into unsaturated hydrocarbons, saturated hydrocarbons, benzene series, polycyclic aromatic hydrocarbons, heterocyclic compounds, alcohols, aldehydes, etc., and are also accompanied by a large amount of combustion waste gas. The main components of combustion waste gas are carbon dioxide, carbon monoxide and sulfur dioxide, etc., forming a three-state pollution of gas, liquid and solid. The rapidly developing catering industry and household kitchens generate a large amount of fumes, and the emission of fumes causes increasingly serious environmental pollution, and harmful gases pose a serious threat to human health.

[0003] In the prior art, an oil fume extractor is usually used to extract and discharge fumes. The most traditional method is to extract the fumes into the flue for centralized discharge, reducing the pollution of the fumes in the kitchen and protecting the health of the people in the kitchen. However, the traditional oil fume extractor does not have a purification function, and the external discharge will still cause pollution to the external environment. Later, the oil fume extractor was added with a purification treatment function, mainly including inertial separation, electrostatic deposition, and filtration adsorption methods. Inertial separation usually uses centrifugal separation. The separation and purification efficiency is low and the effect is poor. It can only remove some solid pollutants limitedly. Electrostatic deposition is to introduce the fumes into a high-voltage electric field, make the particles in the fume gas charged, and move towards the dust collecting electrode under the action of the electric field force. After deposition, it is removed from the fumes. However, the electrostatic deposition device is difficult to clean and is prone to secondary pollution, thus affecting the purification effect. Filtration adsorption is to use an adsorption medium to adsorb and remove the pollutants in the fumes. The adsorption medium usually uses a polymer composite material. In order to ensure the filtration effect, the pores of the adsorption medium are small, which is easy to be blocked, resulting in a large air flow pressure drop during the extraction process, affecting the extraction efficiency and purification effect of the fumes. The service life of the adsorption medium is short, and it needs to be replaced regularly, with high use costs and complex maintenance and replacement. Summary of the Invention

[0004] The technical problem to be solved and the technical task proposed by the present invention are to improve the prior art and provide a gas purification device to solve the problems of poor purification effect and low efficiency of the gas purification treatment device in the current technology.

[0005] To solve the above technical problems, the technical solution of the present invention is:

[0006] A gas purification device, comprising:

[0007] A housing, provided with an air inlet and an air outlet on the housing;

[0008] An activated carbon purification mechanism arranged in the housing, the activated carbon purification mechanism includes an activated carbon layer and a temperature control component for controlling the temperature of the activated carbon layer. When the gas to be treated flowing through the housing passes through the activated carbon layer for adsorption purification treatment, the temperature control component controls the activated carbon layer to be at a first temperature, and the first temperature is higher than the dew point temperature of the gas to be treated.

[0009] The gas purification device of the present invention uses activated carbon for adsorption purification treatment. Activated carbon has a large adsorption capacity and high efficiency, and can effectively adsorb and remove pollutants in the gas, including sulfur dioxide, suspended particulate matter, organic pollutants, etc. in oil fume, so that the pollutants are separated from the gas to achieve the purpose of purification, with good purification effect. And the activated carbon adsorbs and purifies the gas at the first temperature, so as to effectively avoid condensation when the humid gas passes through the activated carbon layer, avoid the liquid generated by condensation from blocking the micropores of the activated carbon layer, ensure good smoothness of the activated carbon layer, avoid excessive air flow pressure drop during the purification process, reduce the required air supply power, ensure long-term and stable purification effect, extend the service life of the activated carbon layer, and reduce the maintenance and replacement cost.

[0010] Further, the first temperature is 30 - 50 °C. The dew point temperature of the gas is not only related to the temperature, but also related to the moisture content in the gas. Generally speaking, the higher the moisture content, the higher the dew point, and the lower the moisture content, the lower the dew point. When the activated carbon layer is at 30 - 50 °C, it can effectively ensure that it is higher than the dew point temperature of the gas to be treated, thus avoiding blockage of the activated carbon layer caused by condensation, and at the same time avoiding oxidation of the activated carbon layer caused by too high temperature for a long time, extending the service life of the activated carbon layer, and ensuring the purification efficiency of the activated carbon layer.

[0011] Further, the temperature control component controls the activated carbon layer to be at a second temperature for desorption. When the activated carbon layer adsorbs too many pollutants and reaches the saturated state, it can no longer carry out effective purification adsorption. The activated carbon layer is heated to be regenerated, so as to avoid directly replacing the activated carbon layer, reduce the use cost, and achieve the purpose of circular use, economy and environmental protection. Through heating, the pollutants undergo a decomposition reaction to generate small molecules and desorb, so that the activated carbon resumes its activity and can be used for purification adsorption again.

[0012] Further, the second temperature is 100 - 200 °C, which ensures that the activated carbon can be desorbed and activated, while also preventing the activated carbon from being oxidized, thus ensuring the purification performance of the activated carbon layer.

[0013] Further, the activated carbon layer is in a cylindrical structure. The air flow can pass through the activated carbon layer from the inside to the outside or from the outside to the inside of the cylindrical structure for adsorption and purification. The cylindrical activated carbon layer has a compact structure and good stability, with a large interaction area for gas passage in a limited space, improving the purification efficiency. The gas to be treated passes through the activated carbon layer from the inside to the outside of the cylindrical activated carbon layer for adsorption and purification treatment, which facilitates the uniform passage of the gas through the entire cylindrical activated carbon layer, improving the effective utilization rate of the activated carbon layer and the purification efficiency.

[0014] Further, the temperature control component includes a heat source for heating the activated carbon layer, and the heat source uses an electric heating element. In the present invention, the activated carbon layer is heated by setting a heat source independent of the activated carbon layer. The heat source can heat the activated carbon layer by means of convection, radiation or conduction. The implementation is convenient and simple, and it is easy to accurately control the temperature of the activated carbon layer, ensuring the adsorption activity and air flow smoothness of the activated carbon layer.

[0015] Further, the electric heating element includes one or a combination of an electric heating wire, a PTC ceramic heating element, a silicon carbide rod, an infrared heater, and a microwave heating device, which can be flexibly selected according to actual needs. When setting the electric heating element, it is necessary to ensure that the electric heating element does not hinder the air flow smoothness of the activated carbon layer.

[0016] Further, the temperature control component includes a temperature control power supply, and the temperature control power supply is electrically connected to the activated carbon layer to energize the activated carbon layer. In the present invention, the activated carbon layer is heated by energizing it. The resistance of the activated carbon itself is very large and the conductivity is low. When a low-voltage current is passed through the activated carbon layer by using the temperature control power supply, the activated carbon layer can heat itself. Compared with using an additional heat source to heat the activated carbon layer, the working principle is different, and the implementation is more convenient and simple, and the structure is more compact. When an additional heat source conducts heat to the activated carbon layer, there is a problem of energy transfer rate, and the energy of the heat source cannot be fully transferred to the activated carbon layer, resulting in large energy loss and high energy consumption. The temperature control power supply can realize the temperature rise of the activated carbon layer by being electrically conducted to the activated carbon layer through a cable. It has high energy utilization rate, low power consumption and is easy to maintain.

[0017] Further, an insulating net is provided on the outer surface of the activated carbon layer. Since the activated carbon layer is in an energized state, the insulating net is used for insulation to avoid accidental contact and improve safety. Moreover, the mesh structure of the insulating net does not impede the airflow, ensuring good air circulation and purification efficiency.

[0018] Further, the temperature control component further includes a control unit and a temperature sensor provided on the activated carbon layer. The control unit receives the monitoring information of the temperature sensor to adjust the power of the temperature control component to maintain the temperature of the activated carbon layer stable, ensuring the temperature stability of the activated carbon layer, avoiding the situation where the temperature is too low to effectively prevent condensation, and also avoiding the situation where the temperature is too high, increasing power consumption or causing oxidation loss of the activated carbon layer.

[0019] Further, the temperature control component further includes a gas state sensor provided on the air outlet side and / or the air inlet side of the activated carbon layer. The gas state sensor includes at least one of an air volume and pressure sensor and a humidity sensor. The control unit receives the monitoring information of the gas state sensor to enable the temperature control component to adjust the temperature of the activated carbon layer. The dew point temperature of the gas is related not only to the temperature but also to the moisture content in the gas. The moisture content in the gas to be treated fluctuates, that is, the dew point temperature fluctuates. If the activated carbon layer is kept at the same temperature value all the time, condensation may occur when the moisture content in the gas to be treated fluctuates and increases, resulting in blockage of the activated carbon layer, affecting air circulation and purification efficiency. The air volume and pressure sensor is used to monitor the air volume and pressure of the airflow after passing through the activated carbon layer, so as to reflect the blockage condition of the activated carbon layer. If the air volume and pressure decrease within a short time, it indicates that condensation causes blockage. The temperature control component raises the temperature of the activated carbon layer to effectively heat the condensation on the activated carbon layer to evaporate, dry the activated carbon layer to restore its adsorption activity and permeability, and restore the high-efficiency purification effect. The gas condition on the air outlet side or the air inlet side can also be detected by the humidity sensor. When the humidity sensor is located on the air outlet side, if the humidity is lower than the preset value, it indicates that condensation has occurred at the activated carbon layer for the gas to be treated, resulting in a decrease in the moisture content. Therefore, the temperature control component raises the temperature of the activated carbon layer to avoid condensation and ensure the air circulation during the entire purification process. When the humidity sensor is located on the air inlet side, the temperature control component automatically adjusts the temperature of the activated carbon layer according to the real-time humidity of the gas to be treated, effectively avoiding the occurrence of condensation.

[0020] Furthermore, an electrostatic purification mechanism for purifying the gas to be treated is also provided inside the housing. The present invention adopts a combination of activated carbon adsorption and electrostatic purification treatment, effectively improving the purification effect. The electrostatic purification mechanism uses a high-voltage electrostatic field to ionize the gas to be treated, charge the pollutants, and under the action of the electric field force, the pollutants move towards the electrodes of the electrostatic field and adhere to the static electrodes and deposit, realizing the separation of pollutants and gas, with high purification efficiency and good effect.

[0021] Furthermore, the electrostatic purification mechanism includes an electrostatic power supply and an electrostatic unit. The electrostatic unit includes two layers of mesh layers separated by insulation. The positive and negative poles of the electrostatic power supply are respectively connected to a mesh layer to form an electrostatic positive pole and an electrostatic negative pole. The gas to be treated passes through the mesh holes of the electrostatic unit for purification treatment. The electrostatic unit structure adopted by the present invention is simple and compact. Since the electrostatic positive pole and the electrostatic negative pole are mesh layers, they have very good air flow smoothness. The resistance of the gas to be treated passing through the electrostatic positive pole and the electrostatic negative pole is small, realizing a filtering and purification effect of low resistance and high adsorption, which can reduce the required air supply power and the overall energy consumption of the gas purification device. The high-voltage electrostatic field between the electrostatic positive pole and the electrostatic negative pole effectively ionizes the gas to be treated. After the pollutants are charged, they are adsorbed onto the electrostatic positive pole and the electrostatic negative pole under the action of the electric field force. The pollutants continuously accumulate on the electrostatic positive pole and the electrostatic negative pole, growing from small to large, and then fall from the electrostatic positive pole and the electrostatic negative pole under the action of their own weight, realizing efficient purification.

[0022] Furthermore, the electrostatic positive pole and the electrostatic negative pole are bent into a serrated structure, which can increase the effective contact area between the electrostatic positive pole, the electrostatic negative pole and the air flow passing through the two, improving the purification and adsorption effect. At the same time, the serrated structure forms several grooves, and the pollutants can accumulate along the grooves. The pollutants with large accumulation can fall along the grooves, reducing the residue of pollutants and being beneficial to the cleaning of the electrostatic positive pole and the electrostatic negative pole.

[0023] Furthermore, the surfaces of the electrostatic positive pole and the electrostatic negative pole are covered with an insulating coating, improving the electrical insulation isolation effect between the electrostatic positive pole and the electrostatic negative pole, ensuring a stable high-voltage electrostatic field between the electrostatic positive pole and the electrostatic negative pole, thus ensuring the purification effect and improving safety, avoiding the situation of electric leakage and accidental contact. The insulating coating is polytetrafluoroethylene, and the adsorbed medium is more likely to detach, which is beneficial to self-cleaning.

[0024] Furthermore, the electrostatic unit also includes a first insulating isolation layer arranged between the electrostatic positive pole and the electrostatic negative pole. The first insulating isolation layer is a mesh layer, ensuring stable electrical insulation isolation between the electrostatic positive pole and the electrostatic negative pole, ensuring a stable high-voltage electrostatic field between the electrostatic positive pole and the electrostatic negative pole, and thus ensuring a stable electrostatic purification effect.

[0025] Further, the electrostatic unit is wound into a single-layer cylindrical structure; or, several electrostatic units are respectively wound into single-layer cylindrical structures with different diameters, and then sleeved together to form a multi-layer ring-shaped cylindrical structure; or, the electrostatic unit is spirally wound to form a cylindrical structure, and the cylindrical structure includes an area where at least two layers of electrostatic units overlap in the radial direction. The air flow can pass through the electrostatic unit from the inside to the outside of the cylindrical structure for adsorption and purification, or from the outside to the inside of the cylindrical structure for adsorption and purification. The cylindrical structure has good stability and a compact structure, with a large interaction area for gas to pass through in a limited space, improving the purification efficiency. Moreover, the multi-layer ring-shaped cylindrical structure has multiple layers of electrostatic units in the radial direction, that is, the gas has to pass through multiple layers of electrostatic units, thereby undergoing multiple electrostatic purification processes to improve the purification effect; similarly, the cylindrical structure formed by spiral winding has an area where the electrostatic units overlap, and the gas has to pass through multiple layers of electrostatic units for multiple electrostatic purification processes, effectively improving the purification effect. And the spiral winding method is more convenient and fast to prepare, and can be formed in one winding, while the multi-layer ring-shaped cylindrical structure needs to separately manufacture multiple single-layer cylindrical structures, and the preparation is relatively more cumbersome. Moreover, in the spiral winding method, there is only one electrostatic positive electrode and one electrostatic negative electrode as a whole, and the electrostatic power supply can form a high-voltage electrostatic field with the least number of circuits, while the multi-layer ring-shaped cylindrical structure has multiple electrostatic positive electrodes and multiple electrostatic negative electrodes, and the electrostatic power supply needs more circuits to be respectively connected to these electrostatic positive electrodes and electrostatic negative electrodes, the circuit is relatively complex, the structure is not compact, and the cost is higher than that of the spiral winding method.

[0026] Further, a second insulating isolation layer is provided between the overlapping electrostatic units. The second insulating isolation layer is a mesh layer, which improves the electrical insulation isolation effect between the electrostatic positive electrode and the electrostatic negative electrode, ensures the formation of a stable high-voltage electrostatic field between the electrostatic positive electrode and the electrostatic negative electrode, and ensures the purification effect.

[0027] Further, the second insulating isolation layer is spirally wound together with the electrostatic unit, improving the preparation convenience. The electrostatic positive electrode, the first insulating isolation layer, the electrostatic negative electrode, and the second insulating isolation layer are combined together to form a four-layer laminated structure, which is convenient for processing. And the second insulating isolation layer covers the entire inner wall surface and the entire outer wall surface of the cylindrical structure. The second insulating isolation layer makes the inside and the outside of the cylindrical structure electrically insulated, thereby improving the safety and avoiding the situation of electric leakage and accidental contact.

[0028] Further, the gas to be treated passes through the electrostatic unit from the inside to the outside of the electrostatic unit of the cylindrical structure for adsorption and purification treatment, which is convenient for the gas to uniformly pass through the electrostatic unit of the entire cylindrical structure, improving the effective utilization rate of the electrostatic unit and the purification efficiency.

[0029] Furthermore, the activated carbon layer in a cylindrical structure surrounds the outer periphery of the electrostatic unit in a cylindrical structure. The gas to be treated passing through the electrostatic unit then continues to pass outward through the activated carbon layer for purification treatment. The structure is compact, occupying a small space. The area of the activated carbon layer and the electrostatic unit for gas purification treatment is large, improving the purification efficiency. The present invention adopts a combination of activated carbon adsorption and electrostatic purification treatment. First, the electrostatic unit effectively removes pollutants with larger particle sizes, which can reduce the purification treatment pressure of the subsequent activated carbon layer, reduce the occurrence of blockage of the activated carbon layer, ensure the smoothness of air flow, enable the entire purification process to proceed stably, ensure the purification effect, and the gas cleanliness obtained by the two purification methods is high and does not need to be discharged externally, thus not causing pollution to the external environment.

[0030] Furthermore, it further includes an impeller driven by a motor. The impeller is arranged at the axis of the electrostatic unit in a cylindrical structure. The axis of the electrostatic unit in a cylindrical structure is a cavity. The impeller device arranged here does not occupy additional space and the structure is compact. The rotation axis of the impeller is along the axis of the electrostatic unit in a cylindrical structure, and the impeller is a centrifugal impeller with axial air inlet and radial air outlet. The impeller is used to generate an air flow that enters the electrostatic unit in a cylindrical structure from the axial end side of the electrostatic unit in a cylindrical structure and then exits radially outward. Under the action of the impeller, the gas to be treated is sucked into the interior of the electrostatic unit in a cylindrical structure from the axial end side of the electrostatic unit in a cylindrical structure, and then flows radially outward through the electrostatic unit in a cylindrical structure. After passing through the purification treatment of the electrostatic unit, the gas continues to flow outward through the activated carbon layer for adsorption purification treatment. The gas passes through the purification treatment of the electrostatic unit and the activated carbon layer successively, effectively improving the purification effect.

[0031] Furthermore, it further includes a liquid supply mechanism. The liquid supply mechanism includes a liquid supply head that supplies liquid to the impeller. The impeller centrifugally throws out the liquid conveyed by the liquid supply head towards the radial outside. The liquid supply mechanism is used to humidify the gas to be treated. After the liquid is mixed with the gas to be treated, it can play a role in cooling the gas. At the same time, the liquid is mixed with the pollutants in the gas to be treated. After the pollutants are mixed into the atomized liquid, they can be better accumulated, which is beneficial to improving the effect of electrostatic purification treatment. When the gas to be treated carrying the atomized liquid passes through the electrostatic unit, the water mist particles containing pollutants are charged and thus adsorbed onto the positive and negative electrodes of the electrostatic unit. The water mist particles continuously accumulate from small particles into large particles, and then fall downward along the electrostatic unit under the action of their own weight, which can clean the electrostatic unit and prevent the electrostatic unit from being blocked, thereby maintaining the long-term and stable purification efficiency of the electrostatic unit. Moreover, the liquid supply head of the present invention faces the impeller, so that the liquid can be evenly distributed in the entire circumference under the centrifugal action of the impeller, which can improve the atomization effect of the liquid. At the same time, the gas to be treated is also centrifuged out under the action of the impeller, so that the gas to be treated and the atomized liquid can fully and evenly contact and mix at the radial outer periphery of the impeller, thereby effectively improving the purification treatment effect.

[0032] Furthermore, the liquid supply mechanism further includes a liquid storage tank, a pump, and a collection tank arranged below the electrostatic unit. The liquid storage tank, the pump, the liquid supply head, and the collection tank are connected by pipelines to conduct circulating liquid supply, recycle the liquid, reduce costs, and save energy and protect the environment.

[0033] Furthermore, a number of liquid flow channels are arranged on the impeller at intervals along the circumference of the impeller. The outlets of the liquid flow channels face the radial outside of the impeller, and the liquid supply head faces the inlets of the liquid flow channels on the radially inner side of the impeller. The liquid ejected from the liquid supply head flows along the liquid flow channels and then is centrifugally thrown out from the outlets of the liquid flow channels. Due to the high-speed rotation of the impeller, the liquid ejected from the liquid supply head will fully collide and spatter into fine particles in the liquid flow channels and then be ejected from the outlets of the liquid flow channels, which can improve the atomization degree of the liquid and make the liquid more evenly distributed in the circumference, improving the mixing sufficiency of the gas to be treated and the atomized liquid. The liquid flow channels also play an effective role in collecting and guiding the liquid, enabling the liquid to be fully centrifugally thrown out towards the radial outside, avoiding partial liquid concentration in the radial central area of the impeller, and improving the utilization rate of the liquid.

[0034] Furthermore, the caliber width of the liquid flow channel gradually decreases towards the radially outer side. According to the relationship between flow rate and flow velocity, when the flow rate is constant, the smaller the cross-sectional area, the faster the flow velocity. The inlet of the liquid flow channel near the radially inner side is wider, which is convenient for fully receiving the liquid ejected by the liquid supply head. The outlet of the liquid flow channel near the radially outer side is smaller, which increases the velocity of the centrifuged liquid, and can strengthen the collision and sputtering of the liquid ejected by the liquid supply head in the liquid flow channel, improving the atomization degree, so that the liquid thrown out from the outlet of the liquid flow channel can more uniformly and fully impact and mix with the gas to be treated, improving the gas-liquid mixing adequacy.

[0035] Furthermore, the outlet of the liquid flow channel is in a slit shape, which can increase the velocity of the centrifugally thrown-out liquid, enabling the liquid to better impact and mix with the gas to be treated, and improving the gas-liquid mixing adequacy.

[0036] Furthermore, several tooth-shaped protrusions are provided on the edge of the slit-shaped outlet. The tooth-shaped protrusions play a role in dividing the liquid thrown out from the slit-shaped outlet, making the liquid more dispersed. The liquid thrown out from the outlet impacts with the tooth-shaped protrusions, improving the atomization effect, and thus can improve the mixing adequacy of the liquid and the gas.

[0037] Furthermore, the impeller is provided with a partition layer perpendicular to its rotation axis. One side of the partition layer is provided with a liquid flow channel, and the other side of the partition layer is provided with blades for axial air intake and radial air outlet. Using the partition layer to relatively separate the functional part of centrifuging the liquid and the functional part of centrifuging the gas can prevent the liquid from directly passing through the impeller axially, avoiding the impact of the liquid and the gas to be treated in the central area of the impeller, which may cause the liquid to fail to contact the impeller and thus cannot be effectively centrifuged out. The partition layer enables the liquid and the gas to be treated to be centrifuged out separately and then impact and mix at the radially outer periphery of the impeller, improving the gas-liquid mixing adequacy.

[0038] Furthermore, an inner guide cover located at the center of the impeller rotation and an outer guide cover surrounding the outer periphery of the inner guide cover are provided on the impeller. A wind channel that turns from the axial direction to the radially outer side is formed between the inner guide cover and the outer guide cover. Blades distributed along the circumferential direction of rotation are provided between the inner guide cover and the outer guide cover, which can better enable the gas to be treated to enter the electrostatic unit inside the cylindrical structure axially and then be centrifuged out and pass through the electrostatic unit towards the radially outer side, effectively improving the stability of the air flow.

[0039] Furthermore, an annular cover is provided which surrounds the outer periphery of the impeller and is spaced apart from the outer periphery of the impeller. A flow guiding channel is formed between the annular cover and the impeller. The gas and liquid centrifugally thrown out by the impeller impinge on the annular cover and sputter and disperse, which can promote better uniform mixing of the gas and liquid. And a gas-liquid mixing region similar to a water film is formed in the flow guiding channel, which can enable the gas to be treated passing through the gas-liquid mixing region to be more fully mixed with the liquid to form a gas-liquid mixture, improving the subsequent purification treatment effect.

[0040] Furthermore, the outlet of the flow guiding channel faces the axis of the cylindrical electrostatic unit. Thus, the gas-liquid mixture flowing out from the flow guiding channel can flow better along the axis of the cylindrical electrostatic unit, enabling the gas-liquid mixture to cover the entire axial region of the cylindrical electrostatic unit, improving the full utilization degree of the electrostatic unit, thereby improving the purification efficiency, avoiding the gas-liquid mixture from passing through locally through the electrostatic unit, and avoiding increasing the local burden of the electrostatic unit and reducing the purification effect.

[0041] Furthermore, a plurality of air guiding vanes are arranged at intervals along the circumferential direction of the impeller in the flow guiding channel. The air guiding vanes are inclined to the rotation axis of the impeller. The air flow generated by the rotation of the impeller towards the radially outer side has a certain degree of rotation and is difficult to pass through the electrostatic unit vertically, resulting in a large energy loss, a large air flow pressure drop, reducing the purification efficiency, and requiring a large air supply power to ensure the normal operation of the equipment. In the present invention, the air guiding vanes are used to straighten the air flow, enabling the air flow to pass through the electrostatic unit vertically well, reducing the loss of wind pressure, and reducing the power required to ensure the normal operation of the gas purification device.

[0042] Furthermore, the air outlet is arranged on the side where the air inlet is located. The purified gas is discharged from the air outlet and can be inhaled again from the air inlet, thereby realizing cyclic purification, improving the purification effect, without the need to exhaust gas externally, and effectively reducing pollution.

[0043] Furthermore, the gas to be treated purification device is installed on the cooking stove, the air inlet faces the cooking stove, the air outlet faces the cooking stove and the air flow discharged from the air outlet forms an air curtain for isolating the cooking stove. The gas purification device of the present invention is used in a cooking environment to purify oil fume. After the oil fume is effectively purified, clean gas is obtained, without the need for external exhaust, without causing pollution to the environment, without the need to drill holes in the wall, with low cost, more convenient to install and use. The clean gas discharged from the air outlet forms an air curtain, and the air curtain is located between the personnel and the cooking stove, playing a role in isolating the oil fume, avoiding the adverse effects of the oil fume on the personnel, ensuring the physical health of the personnel. The air curtain can also play a role in reducing heat transfer, reducing the impact of the heat during cooking on the personnel. The air curtain avoids the escape of the oil fume, ensuring that all the oil fume generated during cooking can be inhaled from the air inlet, improving the sufficiency of the oil fume purification.

[0044] Further, a wind equalizing plate is provided at the air inlet. By using the wind equalizing plate to expand the covered area, the gas in a large area can be effectively inhaled, avoiding the escape of some gas to be treated and improving the purification sufficiency.

[0045] Compared with the prior art, the advantages of the present invention are as follows:

[0046] The gas purification device of the present invention uses activated carbon to adsorb and purify the gas at a temperature higher than the dew point, which can effectively avoid the condensation of humid gas when passing through the activated carbon layer, prevent the liquid generated by condensation from blocking the micropores of the activated carbon layer, ensure that the activated carbon layer has good adsorption activity and smoothness, avoid excessive air flow pressure drop during the purification process, reduce the required air supply power, ensure a long-term and stable purification effect, extend the service life of the activated carbon layer, and reduce the maintenance and replacement cost;

[0047] Adopting the combination of activated carbon adsorption and electrostatic purification treatment to further improve the purification effect. The electrostatic unit effectively removes pollutants with larger particle sizes, reduces the purification treatment pressure of the subsequent activated carbon layer, reduces the occurrence of blockage of the activated carbon layer, ensures the smoothness of air flow, enables the entire purification process to proceed stably, ensures the purification effect, and the gas obtained by the two purification methods has a high cleanliness;

[0048] The liquid supply mechanism is used to effectively cool the gas to be treated. After the gas to be treated is mixed with the mist liquid, it is easier to purify and remove pollutants, and the liquid can be used to clean the electrostatic unit, effectively avoiding the blockage of the electrostatic unit, thereby maintaining the long-term and stable purification efficiency of the electrostatic unit;

[0049] The gas discharged from the air outlet can be inhaled again for cyclic purification, without the need to exhaust gas externally, and will not cause pollution to the external environment. BRIEF DESCRIPTION OF THE DRAWINGS

[0050] Figure 1 It is a schematic structural diagram of the first embodiment of the gas purification device;

[0051] Figure 2 It is another schematic structural diagram of the first embodiment of the gas purification device;

[0052] Figure 3 It is a schematic structural diagram of the second embodiment of the gas purification device;

[0053] Figure 4 It is a schematic structural diagram of the third embodiment of the gas purification device;

[0054] Figure 5 It is a schematic structural diagram of the fourth embodiment of the gas purification device;

[0055] Figure 6 It is the first schematic structural diagram of the electrostatic unit;

[0056] Figure 7 It is the second structural schematic diagram of the electrostatic unit;

[0057] Figure 8 It is the third structural schematic diagram of the electrostatic unit;

[0058] Figure 9 It is the three-dimensional schematic diagram of the third structure of the electrostatic unit;

[0059] Figure 10 It is for Figure 5 the structural schematic diagram of the impeller in

[0060] Figure 11 It is the three-dimensional structural schematic diagram of the impeller;

[0061] Figure 12 It is the structural schematic diagram of the impeller with the top plate layer removed.

[0062] In the figure:

[0063] 1. Housing; 11. Air inlet; 12. Air outlet; 13. Air distribution plate; a. Activated carbon purification mechanism; a1. Activated carbon layer; a2. Electric heating wire; a3. PTC ceramic heating element; a4. Control unit; a5. Temperature sensor; a6. Gas state sensor; a7. Temperature control power supply; a8. Insulation net; a9. Conductive sheet; b. Electrostatic purification mechanism; b1. Electrostatic power supply; b2. Electrostatic unit; b3. Electrostatic positive electrode; b4. Electrostatic negative electrode; b5. First insulating isolation layer; b6. Second insulating isolation layer; c. Impeller; c1. Liquid flow channel; c2. Interlayer; c3. Blade; c4. Top plate layer; c5. Flow channel blade plate; c6. Tooth-like protrusion; c7. Inner guiding cover; c8. Outer guiding cover; c9. Annular cover; c10. Diversion channel; c11. Air guiding blade; d1. Liquid supply head; d2. Liquid storage tank; d3. Pump; d4. Collection tank; e. Cooking range; f. Air curtain. Detailed implementation manners

[0064] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0065] A gas purification device disclosed in an embodiment of the present invention can effectively remove gas, liquid, and solid impurities in oil fume, improve the purification efficiency and purification effect, effectively reduce the occurrence of blockage, ensure the smoothness of the air flow during the entire purification process, ensure the long-term stability of the purification process, maintain a long replacement cycle, have a long service life, and low cost.

[0066] Embodiment 1

[0067] As Figure 1 and Figure 2 shown, a gas purification device mainly includes a housing 1 and an activated carbon purification mechanism a provided in the housing 1. An air inlet 11 and an air outlet 12 are provided on the housing 1. The activated carbon purification mechanism a includes an activated carbon layer a1 and a temperature control component for controlling the temperature of the activated carbon layer a1. When the gas to be treated flowing through the housing 1 passes through the activated carbon layer a1 for adsorption and purification treatment, the temperature control component controls the activated carbon layer a1 to be at a first temperature, and the first temperature is higher than the dew point temperature of the gas to be treated. A fan can be provided in the housing 1 to suck the gas from the air inlet 11, then flow through the housing and pass through the activated carbon layer a1, and finally discharge from the air outlet 12. Alternatively, an air supply mechanism can be externally connected to the air inlet 11 or the air outlet 12 of the housing 1 to form a stable air flow passing through the housing.

[0068] When the gas to be treated passes through the activated carbon layer a1, the pollutants therein are effectively adsorbed and removed, thereby achieving purification. And the activated carbon is at a temperature higher than the dew point, thus effectively avoiding condensation of the gas when passing through the activated carbon layer and avoiding the liquid generated by condensation from blocking the micropores of the activated carbon layer. Specifically, the first temperature is 30 - 50°C. The dew point temperature of the gas is related to the temperature and moisture content. Generally, the dew point is below 30°C. Therefore, heating the activated carbon layer a1 to 30 - 50°C can ensure that it is higher than the dew point to avoid condensation, and at the same time avoid the activated carbon layer a1 being oxidized due to being at too high a temperature for a long time, thereby prolonging the service life of the activated carbon layer.

[0069] After the activated carbon layer a1 has been working for a long time, it will also reach a saturated state due to adsorbing too many pollutants. After the activated carbon reaches a saturated state, it can no longer achieve an effective adsorption and purification effect. The new activated carbon layer a1 can be directly replaced, but the use cost is high. In order to reduce the cost, the temperature control component is used to desorb and regenerate the activated carbon layer. The temperature control component controls the activated carbon layer a1 to be at a second temperature for desorption. Specifically, the second temperature is 100 - 200°C, so that a part of the organic matter adsorbed on the activated carbon boils and vaporizes for desorption, and a part of the organic matter undergoes a decomposition reaction to generate small molecules for desorption. Finally, the regeneration of the activated carbon layer is realized, and it can be normally used for adsorption and purification treatment again.

[0070] In this embodiment, the activated carbon layer a1 is a flat sheet layer. The temperature control component includes a heat source for heating the activated carbon layer a1. The heat source is a heating mechanism independent of the activated carbon layer a1. The heat source heats the activated carbon layer by means of convection, radiation or conduction. For the convenience of control, the heat source adopts an electric heating element, and the electric heating element includes one or more combinations of an electric heating wire, a PTC ceramic heating element, a silicon carbide rod, an infrared heater, and a microwave heating device. Specifically, asFigure 1 As shown, the heating wire a2 is woven into a net shape and covers the surface of the activated carbon layer a1 or is pre-embedded in the activated carbon layer a1. The heating wire a2 does not interfere with the smoothness of the air flow, thus ensuring the purification efficiency while heating the activated carbon layer a1; such as Figure 2 As shown, when using the PTC ceramic heating element a3, the PTC ceramic heating element a3 is arranged on the side of the activated carbon layer a1 perpendicular to the air flow direction, avoiding hindering the passage of gas through the activated carbon layer a1. A heat preservation structure can also be arranged outside the PCT ceramic heating element to reduce heat dissipation, thereby reducing energy consumption and usage costs.

[0071] Moreover, the temperature control component further includes a control unit a4 and a temperature sensor a5 arranged on the activated carbon layer a1. The control unit a4 receives the monitoring information of the temperature sensor a5 to adjust the power of the temperature control component to maintain the stable temperature of the activated carbon layer a1. Since the specific water content of the gas to be treated is different, the dew point is also different. It can flexibly adjust and maintain the temperature of the activated carbon layer a1 according to the specific conditions of different gases to be treated, effectively avoiding blockage caused by condensation while reducing energy consumption, and having strong flexible applicability.

[0072] Furthermore, the temperature control component further includes a gas state sensor a6 arranged on the outlet side and / or the inlet side of the activated carbon layer a1. The gas state sensor a6 includes at least one of a wind volume and wind pressure sensor and a humidity sensor. The control unit a4 receives the monitoring information of the gas state sensor to enable the temperature control component to adjust the temperature of the activated carbon layer a1.

[0073] The wind volume and wind pressure sensor and the humidity sensor are arranged on the outlet side of the activated carbon layer a1. When the water content in the gas to be treated fluctuates, it is easy to have a situation where the water content is high for a period of time and low for a period of time. If the activated carbon layer a1 is maintained at the same temperature all the time, when the temperature is set too low, condensation will occur on the activated carbon layer a1 when the water content of the gas to be treated becomes high, resulting in blockage. When the temperature is set too high, the energy consumption required to heat the activated carbon layer a1 will be high, and the usage cost will increase. Therefore, the wind volume and wind pressure sensor is used to monitor the wind volume and wind pressure of the air flow after passing through the activated carbon layer, which can reflect the blockage condition of the activated carbon layer. The humidity sensor monitors the humidity state of the gas after passing through the activated carbon layer a1, which can reflect whether condensation occurs and causes the gas humidity to decrease. If the wind volume and wind pressure decrease within a short period of time, it means that the water content of the gas to be treated has become high and condensation has occurred, resulting in blockage. The temperature control component raises the temperature of the activated carbon layer, thereby effectively heating the condensation on the activated carbon layer to evaporate it, restoring the adsorption activity and smoothness of the activated carbon layer, and the temperature control component reduces the temperature of the activated carbon layer to the normal value, thereby effectively reducing the overall energy consumption;

[0074] The humidity sensor can be set on the intake side of the activated carbon layer a1 to detect the condition of the gas to be treated. The temperature control component automatically adjusts the temperature of the activated carbon layer a1 according to the real-time humidity of the gas to be treated, effectively avoiding the occurrence of condensation and keeping the activated carbon in the best working state all the time.

[0075] Embodiment 2

[0076] As Figure 3 shown, the difference from Embodiment 1 is that the temperature control component uses a temperature control power supply a7, and the temperature control power supply a7 is electrically connected to the activated carbon layer a1 to energize the activated carbon layer a1. The resistance of the activated carbon layer a1 is very large and the conductivity is low. When a low-voltage current is applied to the activated carbon layer a1, the activated carbon layer a1 can heat itself. Different from using an additional heat source to conduct heat to the activated carbon layer, in this embodiment, the activated carbon layer a1 is heated by itself through the method of energization, which is more convenient and simple to implement, the structure is more compact, the energy utilization rate is high, and the power consumption is low. In order to improve safety, an insulating net a8 is arranged on the outer surface of the activated carbon layer a1 to avoid the situation of accidental contact and electric shock.

[0077] In this embodiment, the activated carbon layer a1 has a cylindrical structure. Conductive sheets a9 are respectively inserted at both axial ends of the cylindrical activated carbon layer a1, and the conductive sheets a9 at both ends are respectively electrically connected to the positive and negative electrodes of the temperature control power supply a7, so as to realize the application of a low-voltage current to the activated carbon layer a1. Specifically, the conductive sheet a9 at one end of the activated carbon layer a1 is cylindrical, and the conductive sheet at the other end is annular, which can be stably connected to the activated carbon layer a1, thus ensuring the reliability of electrical conduction and avoiding the situation of poor contact, and ensuring that the activated carbon layer a1 can be heated normally and the temperature can be accurately controlled.

[0078] The structure of the cylindrical activated carbon layer a1 is compact, and it has a large interaction area for gas to pass through in a limited space, improving the purification efficiency. The gas to be treated passes through the activated carbon layer a1 from the inside to the outside of the cylindrical activated carbon layer a1 for adsorption and purification treatment. Specifically, one axial end of the cylindrical activated carbon layer a1 is closed, the other axial end is open and communicated with the air inlet 11 of the shell, and the circumferential outer periphery of the cylindrical activated carbon layer a1 is communicated with the air outlet 12. A fan is arranged at the opening of the cylindrical activated carbon layer a1 to introduce the gas to be treated into the inside of the cylindrical activated carbon layer a1, and then the fan centrifugally discharges the gas to be treated radially outward, so that the gas to be treated passes through the activated carbon layer a1 radially outward in the entire circumference of the cylindrical activated carbon layer a1, thereby realizing adsorption and purification, and the purified gas is discharged from the air outlet 12.

[0079] Embodiment 3

[0080] As Figure 4As shown, an activated carbon purification mechanism a and an electrostatic purification mechanism b are arranged in the housing 1, and the electrostatic purification mechanism b and the activated carbon purification mechanism a are arranged in sequence along the direction of the air flow in the housing. The electrostatic purification mechanism uses a high-voltage electrostatic field to ionize the gas to be treated, charge the pollutants, and make the pollutants move towards the electrodes of the electrostatic field under the action of the electric field force and deposit on the static electrodes, realizing the separation of pollutants and gas. First, the electrostatic unit effectively removes pollutants with larger particle sizes, which can reduce the purification pressure of the subsequent activated carbon layer, reduce the occurrence of blockage of the activated carbon layer, ensure the smoothness of air flow, enable the entire purification process to proceed stably, and ensure the purification effect. The activated carbon purification mechanism a adopted in this embodiment is as specifically described in Embodiment 1;

[0081] The electrostatic purification mechanism b adopted in this embodiment specifically includes an electrostatic power supply b1 and an electrostatic unit b2. The electrostatic unit b2 includes two layers of mesh layers separated by insulation. The positive and negative electrodes of the electrostatic power supply b1 are respectively connected to a mesh layer to form an electrostatic positive electrode b3 and an electrostatic negative electrode b4. The electrostatic positive electrode b3 and the electrostatic negative electrode b4 are parallel to each other to ensure the uniformity and stability of the high-voltage electrostatic field between the electrostatic positive electrode b3 and the electrostatic negative electrode b4. The gas to be treated passes through the mesh holes of the electrostatic unit b2 for purification treatment. Since the electrostatic positive electrode and the electrostatic negative electrode are mesh layers, they have very good air flow smoothness, the resistance of the gas to be treated passing through the electrostatic positive electrode and the electrostatic negative electrode is small, realizing the filtration and purification effect of low resistance and high adsorption, which can reduce the required air supply power and reduce the overall energy consumption of the gas purification device;

[0082] An insulating coating is covered on the surfaces of the electrostatic positive electrode b3 and the electrostatic negative electrode b4. The insulating coating is sprayed on the electrostatic positive electrode b3 and the electrostatic negative electrode b4 by spraying. The insulating coating can adopt PTFE material to ensure the electrical insulation stability between the electrostatic positive electrode b3 and the electrostatic negative electrode b4;

[0083] In order to further ensure the electrical insulation stability between the electrostatic positive electrode b3 and the electrostatic negative electrode b4, the electrostatic unit b2 further includes a first insulating isolation layer b5 arranged between the electrostatic positive electrode b3 and the electrostatic negative electrode b4. The first insulating isolation layer b5 is a mesh layer. The first insulating isolation layer b5 can be specifically made of materials such as PTFE, PP, and PVC, effectively preventing the direct electrical conduction between the electrostatic positive electrode b3 and the electrostatic negative electrode b4. Specifically, the electrostatic positive electrode and the electrostatic negative electrode can be closely attached to the first insulating isolation layer. The first insulating isolation layer plays a role in shaping, enabling the electrostatic positive electrode and the electrostatic negative electrode to maintain a stable positional relationship, that is, the electrostatic positive electrode and the electrostatic negative electrode are stably and parallelly spaced apart, thereby ensuring the stability of the high-voltage electrostatic field generated between the electrostatic positive electrode and the electrostatic negative electrode, and further ensuring the stability of the purification effect. The structure is simple, compact, and occupies a small volume.

[0084] Embodiment 4

[0085] As shown Figures 5 to 12 As shown, the gas purification device is applied to the stove e to purify the fumes generated during cooking. Specifically, the housing device is above the stove, and an activated carbon purification mechanism a and an electrostatic purification mechanism b are arranged in the housing 1;

[0086] The electrostatic purification mechanism b includes an electrostatic power supply b1 and an electrostatic unit b2. The electrostatic unit b2 includes two layers of mesh layers separated by insulation. The positive and negative electrodes of the electrostatic power supply are respectively connected to one mesh layer to form an electrostatic positive electrode b3 and an electrostatic negative electrode b4. The gas to be treated passes through the mesh holes of the electrostatic unit b2 for purification. The surfaces of the electrostatic positive electrode b3 and the electrostatic negative electrode b4 are covered with an insulating coating, and the insulating coating uses PTFE material. The electrostatic unit b2 further includes a first insulating isolation layer b5 arranged between the electrostatic positive electrode b3 and the electrostatic negative electrode b4. The first insulating isolation layer b5 is a mesh layer, and the first insulating isolation layer b5 can be specifically made of materials such as PTFE, PP, and PVC;

[0087] In this embodiment, as shown Figure 6 As shown, the electrostatic unit b2 is wound into a single-layer cylindrical structure, and the gas passes through the single-layer electrostatic unit b2 when flowing radially;

[0088] Or, as shown Figure 7 As shown, several electrostatic units b2 are respectively wound into single-layer cylindrical structures with different diameters, and then sleeved together to form a multi-layer ring-shaped cylindrical structure. The multi-layer ring-shaped cylindrical structure has multiple layers of electrostatic units b2 in the radial direction. That is to say, when the gas flows radially, it has to pass through multiple layers of electrostatic units b2, so as to perform multiple electrostatic purification treatments, which can effectively improve the purification effect;

[0089] Or, as shown Figure 8 and Figure 9As shown, the electrostatic unit b2 is spirally wound to form a cylindrical structure. The cylindrical structure includes a region where at least two layers of electrostatic units b2 overlap in the radial direction. A second insulating layer b6 is provided between the overlapping electrostatic units b2. The second insulating layer b6 is a mesh layer and can be made of materials such as PTFE, PP, and PVC to improve the electrical insulation effect between the positive and negative electrodes of the static electricity. The second insulating layer b6 is spirally wound together with the electrostatic unit b2. The combination of the positive electrode of the static electricity, the first insulating layer, the negative electrode of the static electricity, and the second insulating layer forms a four-layer laminated structure, which can be formed by one winding, and the preparation is convenient and fast. The unfolded length of the second insulating layer b6 is greater than the unfolded length of the electrostatic unit b2, and the second insulating layer b6 covers the entire inner wall surface and the entire outer wall surface of the cylindrical structure, so that the electrostatic unit b2 as a whole can be effectively electrically isolated from the outside, avoiding the danger of electric leakage and improving the safety of use. The spirally wound method has only one positive electrode and one negative electrode of the static electricity as a whole, and the static electricity source can form a high-voltage electrostatic field with the least number of lines.

[0090] The above three structural forms can all be collectively referred to as the electrostatic unit b2 of the cylindrical structure. The activated carbon purification mechanism a adopts the technical solution described in the second embodiment and is in the form of a cylindrical activated carbon layer a1 surrounding the outer periphery of the electrostatic unit b2 of the cylindrical structure. The gas to be treated passes from the inside to the outside of the electrostatic unit b2 of the cylindrical structure to perform adsorption and purification treatment, and then the air flow continues to flow radially outward to pass through the activated carbon layer a1 for adsorption and purification treatment.

[0091] Specifically, the axis of the electrostatic unit b2 of the cylindrical structure is along the vertical direction, and the axis of the activated carbon layer a1 of the cylindrical structure is also along the vertical direction. The housing 1 wraps around the outer periphery of the electrostatic unit b2 of the cylindrical structure and the activated carbon layer a1 of the cylindrical structure. An air inlet 11 is provided at the lower side of the housing 1 at the axial center position of the lower end of the electrostatic unit b2 of the cylindrical structure. The air inlet 11 faces the cooking range e and can effectively collect the cooking fumes generated on the cooking range e.

[0092] As Figure 5 、 Figures 10 to 12 As shown, an impeller c driven by a motor is provided at the air inlet 11 at the axial center position of the electrostatic unit b2 of the cylindrical structure. The rotation axis of the impeller c is along the axis of the electrostatic unit b2 of the cylindrical structure, and the impeller c is a centrifugal impeller with axial air inlet and radial air outlet. The impeller c pumps the gas to be treated into the electrostatic unit b2 of the cylindrical structure from the axial end side of the electrostatic unit b2 of the cylindrical structure, and then the impeller c centrifugally throws the gas to be treated radially outward, so that the gas to be treated sequentially passes through the electrostatic unit b2 and the activated carbon layer a1 radially outward.

[0093] A liquid supply mechanism is also provided inside the housing. The liquid supply mechanism includes a liquid supply head d1 that supplies liquid to the impeller c. The impeller c centrifugally throws out the liquid conveyed by the liquid supply head d1 towards the radial outside. Thus, the gas to be treated centrifugally thrown out by the impeller c collides and mixes with the liquid centrifugally thrown out by the impeller c. After the pollutants are mixed into the liquid, they can be better accumulated, which is beneficial to improving the effect of electrostatic purification treatment. When the gas to be treated carrying the atomized liquid passes through the electrostatic unit b2, the water mist particles containing pollutants are charged and thus adsorbed onto the positive electrode and negative electrode of the electrostatic unit b2. The water mist particles continuously accumulate from small particles into large particles, and then fall downward along the electrostatic unit b2 under the action of their own weight, which can play a role in cleaning the electrostatic unit b2, avoiding blockage of the electrostatic unit b2, and thus maintaining the long-term stable purification efficiency of the electrostatic unit b2. And, in this embodiment, as Figure 8 shown, the positive electrode b3 and negative electrode b4 of the electrostatic are also bent into a serrated structure, which can increase the effective contact area between the positive electrode, negative electrode and the air flow passing through the two. The serrated structure forms several vertical grooves on the surfaces of the positive electrode b3 and negative electrode b4 of the electrostatic. The water mist particles mixed with pollutants can accumulate along the grooves and finally accumulate into large droplets, which can smoothly fall along the grooves, avoiding blockage and having a good self-cleaning effect.

[0094] The liquid supply mechanism further includes a liquid storage tank d2, a pump d3 and a collection tank d4 provided below the electrostatic unit b2. The liquid storage tank d2, the pump d3, the liquid supply head d1 and the collection tank d4 are connected by pipelines to perform circulating liquid supply. A water replenishing port is provided at the upper part of the liquid storage tank d2, a sewage discharge port is provided at the lower part of the liquid storage tank, and a liquid level indicator is also provided on the liquid storage tank d2, so that the amount of liquid stored in the liquid storage tank d2 can be conveniently and intuitively grasped, and it is convenient to add in time to ensure the purification effect. The liquid storage tank d2 is in a static state and can play a role in oil-water separation. The oil floats on the top surface of the water. An oil receiving box is also provided below the liquid storage tank d2, which can receive the oil overflowing from the liquid storage tank d2 for convenient cleaning.

[0095] In this embodiment, a plurality of liquid flow channels c1 are provided on the impeller c at intervals along the circumferential direction of the impeller c. The outlets of the liquid flow channels c1 face the radially outer side of the impeller c. The liquid supply head d1 faces the inlet of the liquid flow channels c1 on the radially inner side of the impeller c. Specifically, the impeller c is provided with a partition layer c2 perpendicular to its rotation axis. The liquid flow channels c1 are provided on the top side of the partition layer c2, and blades c3 for axial air inlet and radial air outlet are provided on the lower side of the partition layer c2. The partition layer relatively separates the functional part of the centrifugal liquid and the functional part of the centrifugal gas, avoiding the impact of the liquid and the gas to be treated in the central area of the impeller, so that the liquid cannot contact the impeller and thus cannot be effectively centrifugally thrown out. After the liquid and the gas to be treated are respectively centrifugally thrown out sufficiently by the partition layer, they then collide and mix at the radially outer periphery of the impeller, improving the adequacy of the gas-liquid mixing.

[0096] Specifically, as Figures 10 to 12 shown, the impeller c is provided with a top plate layer c4 parallel to the partition layer c2 above the partition layer c2. A plurality of flow channel blade plates c5 connected between the two are provided between the top plate layer c4 and the partition layer c2. The flow channel blade plates c5 are distributed along the rotation circumference of the impeller c. The liquid flow channels c1 are formed by the regions between two adjacent flow channel blade plates c5. And the caliber width of the liquid flow channels c1 gradually decreases toward the radially outer side. Specifically, the flow channel blade plates c5 are straight plates, the flow channel blade plates c5 are inclined to the radial direction, and the flow channel blade plates c5 are spaced apart from one of the flow channel blade plates c5 on its two sides to form the liquid flow channels c1, and are spliced together with the other flow channel blade plate c5 at the end on the radially inner side of the main body to form a pointed corner portion, avoiding the liquid ejected from the liquid supply head from remaining in the central area of the impeller. The liquid flow channels c1 are triangular regions, with a narrow width at the radially outer side and a wider width at the radially inner side, which can ensure the speed of the liquid being centrifuged out. The outlets of the liquid flow channels c1 are in a slit shape, which can improve the speed of the liquid being centrifugally thrown out, enabling the liquid to better collide and mix with the gas to be treated, improving the adequacy of the gas-liquid mixing. And a plurality of tooth-shaped protrusions c6 are provided on the edge of the slit-shaped outlet of one of the flow channel blade plates c5. The tooth-shaped protrusions play a role in dividing the liquid ejected from the slit-shaped outlet, making the liquid more dispersed. The liquid ejected from the outlet collides with the tooth-shaped protrusions, improving the atomization effect.

[0097] An inner guide cover c7 located at the rotation center of the impeller c and an outer guide cover c8 surrounding the periphery of the inner guide cover c7 are provided on the impeller c. The inner guide cover c7 and the outer guide cover c8 are located below the partition layer c2. A wind channel that turns from the axial direction to the radially outer side is formed between the inner guide cover c7 and the outer guide cover c8. Blades c3 distributed along the rotation circumference are provided between the inner guide cover c7 and the outer guide cover c8, which can make the air flow turn more smoothly and enable the air flow to flow better along the radially outer side.

[0098] In this embodiment, an annular cover c9 is further provided, which surrounds the outer periphery of the impeller c and is spaced apart from the outer periphery of the impeller c. A diversion channel c10 is formed between the annular cover c9 and the impeller c. The gas and liquid centrifugally thrown out by the impeller impinge on the annular cover and are sputtered and dispersed, which can promote better uniform mixing of the gas and liquid. A gas-liquid mixing region similar to a water film is formed in the diversion channel, enabling the gas to be treated passing through the gas-liquid mixing region to be more fully mixed with the liquid to form a gas-liquid mixture, so that the gas to be treated is fully wetted, improving the subsequent purification treatment effect. The outlet of the diversion channel c10 faces the axial direction of the cylindrical electrostatic unit b2, so that the gas-liquid mixture is evenly distributed along the entire axial direction of the cylindrical electrostatic unit b2, improving the utilization efficiency of the electrostatic unit b2. Moreover, a plurality of air guide vanes c11 are arranged at intervals along the circumferential direction of the impeller c in the diversion channel c10. The air guide vanes c11 are inclined to the rotation axis of the impeller c, and the air flow is rectified by the air guide vanes, enabling the air flow to vertically pass through the electrostatic unit b2 well, reducing the loss of wind pressure and the air supply power required for the normal operation of the equipment.

[0099] In this embodiment, as Figure 5 shown, the air outlet 12 is opened on the same side as the air inlet 11, that is, the air outlet 12 is also arranged on the lower side of the housing 1. Specifically, the air outlet 12 communicates with the outer peripheral region of the activated carbon layer a1. The purified gas obtained by the activated carbon purification mechanism a and the electrostatic purification mechanism b is discharged from the air outlet. Since the air outlet is arranged on the side where the air inlet is located, the purified gas can be inhaled again from the air inlet, thus realizing cyclic purification, further improving the purification cleanliness, without the need to exhaust gas externally, effectively reducing the pollution to the outside, without the need to break walls and drill holes, with low cost and more convenient installation and use.

[0100] The air outlet 12 faces the cooking range e, and the air flow discharged from the air outlet 12 forms an air curtain f for isolating the cooking range e. Specifically, the air curtain f is located between the operator and the cooking range e, playing a role in isolating oil fume. The air outlet 12 can also be provided with a circle around the outer peripheral region of the cooking range e, so that the air curtain f can surround the entire cooking range e, effectively preventing oil fume from escaping and ensuring that all the oil fume generated during cooking can be effectively inhaled into the gas purification device through the air inlet for purification treatment. A wind equalizing plate 13 is arranged at the air inlet 11. The wind equalizing plate 13 is inclined to the vertical direction. The wind equalizing plate is used to expand the covered area, enabling the gas in a large area to be effectively inhaled, avoiding the existence of inhalation dead angles, and improving the oil fume purification effect.

[0101] The above are only the preferred embodiments of the present invention. It should be noted that the above preferred embodiments should not be construed as limiting the present invention, and the protection scope of the present invention should be subject to the scope defined by the claims. For those of ordinary skill in the art, without departing from the spirit and scope of the present invention, several improvements and modifications can also be made, and these improvements and modifications should also be regarded as within the protection scope of the present invention.

Claims

1. A gas purification device, characterized in that, it comprises: a housing (1), on which an air inlet (11) and an air outlet (12) are provided; an activated carbon purification mechanism (a) arranged in the housing (1), the activated carbon purification mechanism (a) includes an activated carbon layer (a1) and a temperature control component for controlling the temperature of the activated carbon layer (a1). When the gas to be treated flowing through the housing (1) passes through the activated carbon layer (a1) for adsorption purification treatment, the temperature control component controls the activated carbon layer (a1) to be at a first temperature, and the first temperature is higher than the dew point temperature of the gas to be treated; an electrostatic purification mechanism (b) for purifying the gas to be treated is further arranged in the housing (1), the electrostatic purification mechanism (b) includes a cylindrical electrostatic unit (b2), and the gas to be treated passes through the electrostatic unit (b2) from the inside to the outside of the cylindrical electrostatic unit for adsorption purification treatment. It further includes an impeller (c) driven by a motor, the impeller (c) is arranged at the axis of the cylindrical electrostatic unit (b2), the rotation axis of the impeller (c) is along the axis of the cylindrical electrostatic unit, and the impeller (c) is a centrifugal impeller with axial air inlet and radial air outlet; a plurality of liquid flow channels (c1) are arranged on the impeller (c) at intervals along the circumferential direction of the impeller (c), the outlet of the liquid flow channel (c1) faces the radial outside of the impeller (c), and the inlet of the liquid flow channel (c1) is close to the radial inside of the impeller (c); the impeller (c) is provided with a partition layer (c2) perpendicular to its rotation axis, the impeller (c) is further provided with a top plate layer (c4) parallel to the partition layer (c2), a plurality of flow channel blade plates (c5) connecting the two are arranged between the top plate layer (c4) and the partition layer (c2), the flow channel blade plates (c5) are distributed along the rotation circumference of the impeller (c), the liquid flow channel (c1) is formed by the area between two adjacent flow channel blade plates (c5), one side of the partition layer (c2) is provided with the liquid flow channel (c1), and the other side of the partition layer (c2) is provided with blades (c3) for axial air inlet and radial air outlet.

2. The gas purification device according to claim 1, characterized in that, the first temperature is 30 - 50 °C.

3. The gas purification device according to claim 1, characterized in that, the temperature control component controls the activated carbon layer (a1) to be at a second temperature for desorption.

4. The gas purification device according to claim 3, characterized in that, the second temperature is 100 - 200 °C.

5. The gas purification device according to claim 1, characterized in that, the activated carbon layer (a1) is in a cylindrical structure, and the gas to be treated passes through the activated carbon layer (a1) from the inside to the outside of the cylindrical activated carbon layer for adsorption purification treatment.

6. The gas purification device according to claim 1, characterized in that, the temperature control component includes a heat source for heating the activated carbon layer (a1), and the heat source uses an electric heating element.

7. The gas purification device according to claim 6, characterized in that, the electric heating element includes one or a combination of more of an electric heating wire, a PTC ceramic heating element, a silicon carbide rod, an infrared heater, and a microwave heating device.

8. The gas purification device according to claim 1, characterized in that, the temperature control component includes a temperature control power supply (a7), and the temperature control power supply (a7) is electrically connected to the activated carbon layer (a1) to energize the activated carbon layer (a1).

9. The gas purification device according to claim 8, characterized in that, an insulating net (a8) is arranged on the outer surface of the activated carbon layer (a1).

10. The gas purification device according to any one of claims 6 to 9, characterized in that, the temperature control component further includes a control unit (a4) and a temperature sensor (a5) arranged on the activated carbon layer (a1), and the control unit (a4) receives the monitoring information of the temperature sensor (a5) to adjust the power of the temperature control component to maintain the temperature stability of the activated carbon layer (a1).

11. The gas purification device according to claim 10, characterized in that, the temperature control component further includes a gas state sensor arranged on the gas outlet side and / or the gas inlet side of the activated carbon layer (a1), and the gas state sensor includes at least one of an air volume and air pressure sensor and a humidity sensor, and the control unit (a4) receives the monitoring information of the gas state sensor to enable the temperature control component to adjust the temperature of the activated carbon layer (a1).

12. The gas purification device according to any one of claims 1 to 9, characterized in that, the electrostatic purification mechanism (b) includes an electrostatic power supply (b1) and an electrostatic unit (b2), the electrostatic unit includes two layers of mesh layers separated by insulation, and the positive and negative electrodes of the electrostatic power supply (b1) are respectively connected to one mesh layer to form an electrostatic positive electrode (b3) and an electrostatic negative electrode (b4), and the gas to be treated passes through the mesh holes of the electrostatic unit for purification treatment.

13. The gas purification device according to claim 12, characterized in that, the electrostatic positive electrode (b3) and the electrostatic negative electrode (b4) are bent into a serrated structure.

14. The gas purification device according to claim 12, characterized in that, the surfaces of the electrostatic positive electrode (b3) and the electrostatic negative electrode (b4) are covered with an insulating coating.

15. The gas purification device according to claim 12, characterized in that, the electrostatic unit further includes a first insulating isolation layer (b5) arranged between the electrostatic positive electrode (b3) and the electrostatic negative electrode (b4), and the first insulating isolation layer (b5) is a mesh layer.

16. The gas purification device according to claim 12, characterized in that, the electrostatic unit is wound into a single-layer cylindrical structure; alternatively, several electrostatic units are respectively wound into single-layer cylindrical structures with different diameters, and then sleeved together to form a multi-layer ring-shaped cylindrical structure; alternatively, the electrostatic unit is spirally wound to form a cylindrical structure, and the cylindrical structure includes a region where at least two layers of electrostatic units overlap in the radial direction.

17. The gas purification device according to claim 16, characterized in that, A second insulating isolation layer (b6) is provided between overlapping electrostatic units, and the second insulating isolation layer (b6) is a mesh layer.

18. The gas purification device according to claim 17, characterized in that the second insulating isolation layer (b6) is wound in a spiral shape together with the electrostatic unit, and the second insulating isolation layer (b6) covers the entire inner side wall surface and the entire outer peripheral wall surface of the cylindrical structure.

19. The gas purification device according to claim 16, characterized in that the activated carbon layer (a1) in a cylindrical structure surrounds the outer periphery of the electrostatic unit in the cylindrical structure, and the gas to be treated passing through the electrostatic unit then continues to pass outwards through the activated carbon layer (a1) for purification treatment.

20. The gas purification device according to claim 1, characterized in that it further includes a liquid supply mechanism, the liquid supply mechanism includes a liquid supply head (d1) for supplying liquid to the impeller (c), the liquid supply head (d1) faces the inlet of the liquid flow channel (c1), and the impeller (c) centrifugally throws out the liquid conveyed by the liquid supply head (d1) towards the radial outside.

21. The gas purification device according to claim 20, characterized in that the liquid supply mechanism further includes a liquid storage tank (d2), a pump (d3) and a collection tank (d4) provided below the electrostatic unit, and the liquid storage tank (d2), the pump (d3), the liquid supply head (d1) and the collection tank (d4) are connected by pipelines for circulating liquid supply.

22. The gas purification device according to claim 1, characterized in that the caliber width of the liquid flow channel (c1) gradually decreases towards the radial outside.

23. The gas purification device according to claim 1, characterized in that the outlet of the liquid flow channel (c1) is in a slit shape.

24. The gas purification device according to claim 23, characterized in that several tooth-shaped protrusions (c6) are further provided on the edge of the slit-shaped outlet.

25. The gas purification device according to claim 1, characterized in that an inner guide cover (c7) located at the rotation center of the impeller (c) and an outer guide cover (c8) surrounding the periphery of the inner guide cover (c7) are provided on the impeller (c), and an air duct that turns from the axial direction to the radial outside is formed between the inner guide cover (c7) and the outer guide cover (c8), and blades (c3) distributed along the rotation circumference are provided between the inner guide cover (c7) and the outer guide cover (c8).

26. The gas purification device according to claim 1, characterized in that an annular cover (c9) surrounding the outer periphery of the impeller (c) and spaced apart from the outer periphery of the impeller (c) is further provided, and a diversion channel (c10) is formed between the annular cover (c9) and the impeller (c).

27. The gas purification device according to claim 26, characterized in that the outlet of the diversion channel (c10) faces the axial direction of the electrostatic unit in the cylindrical structure.

28. The gas purification device according to claim 27, characterized in that several air guide vanes (c11) are provided at intervals along the circumferential direction of the impeller (c) in the diversion channel (c10), and the air guide vanes (c11) are inclined to the rotation axial direction of the impeller (c).

29. The gas purification device according to claim 1, characterized in that, the air outlet (12) is arranged on the same side as the air inlet (11).

30. The gas purification device according to claim 29, characterized in that, the gas purification device is installed on the cooking range (e), the air inlet (11) faces the cooking range (e), the air outlet (12) faces the cooking range (e) and the air flow discharged from the air outlet (12) forms an air curtain (f) for isolating the cooking range (e).

31. The gas purification device according to claim 1, characterized in that, an air distribution plate (13) is arranged at the air inlet (11).

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