Heat recovery oil smoke exhaust device for public kitchen

Abstract

The utility model relates to the technical field of smoke exhaust equipment, in particular to a heat recovery smoke exhaust device for a public kitchen, which comprises a heat exchange component, a smoke exhaust component and a smoke exhaust component, the heat exchange component comprises two heat exchange boxes, the two heat exchange boxes are communicated through a heat pipe, and a bypass pipe is arranged on each of two sides of each heat exchange box; the cleaning assembly can clean the heat pipe through steam; the airflow control assembly is used for controlling an airflow path. By arranging the airflow control assembly, the two ends of the heat exchange box can be sealed at the same time, airflow turbulence generated when smoke is exhausted and fresh air enters is reduced, and the exhaust and air inlet efficiency is guaranteed; by adding the heat preservation layer, heat exchange between the heat exchange assembly and external air can be reduced, heat loss is reduced, and the heat exchange efficiency is improved; by arranging the cleaning assembly, steam is used for cleaning the heat pipe, oil sludge attached to the surface can be removed, and the heat exchange efficiency is prevented from being reduced; by arranging the waste liquid recycling assembly, cleaning waste liquid can be collected, and environmental pollution is reduced.

Description

Technical Field

[0001] This utility model relates to the field of smoke extraction equipment technology, specifically a heat recovery smoke extraction device for public kitchens. Background Technology

[0002] Public kitchens, such as commercial or school cafeterias, typically use exhaust systems that directly draw air outwards, using negative pressure to remove fumes. After treatment, the fumes are released into the atmosphere. Public kitchens have a large exhaust volume, drawing out a significant amount of indoor air during operation. This necessitates a fresh air system to inject a large amount of outside air to replenish the emptied air. In winter, when indoor temperatures are low, the influx of cold air causes a drop in indoor temperature, increasing the load on the heating system and energy consumption, while the heat from the expelled fumes is wasted.

[0003] In the prior art, there are technologies that utilize heat pipe heat exchangers to recover heat from exhaust air and heat fresh air. For example, CN213019790U discloses a rooftop exhaust heat recovery unit for kitchens. This unit uses built-in heat pipes to achieve heat exchange between exhaust air and fresh air, reducing energy consumption. By setting a bypass ventilation path, a bypass mode is added, which can bypass the heat pipe heat exchanger and avoid excessively high indoor temperatures in summer due to heat recovery. A cleaning switch is set up to use nozzles to clean the dust accumulated on the surface of the heat pipes.

[0004] However, in actual use, the following shortcomings exist. First, in the exhaust duct, the bypass port is located at the exhaust outlet, which easily creates turbulence in the exhaust airflow at the heat exchanger exhaust inlet, affecting exhaust efficiency. Second, although the exhaust airflow is treated, it still contains a certain amount of oil fumes, which adhere to the surface of the heat exchange tubes and turn into sludge. Water flow can only wash away the surface dust, but cannot wash away the sludge. The cleaning effect is not ideal. Utility Model Content

[0005] To overcome the above shortcomings, this utility model provides a heat recovery and fume extraction device for public kitchens.

[0006] The technical solution of this utility model is:

[0007] A heat recovery fume extraction system for public kitchens includes:

[0008] A heat exchange assembly includes two heat exchange boxes stacked one on top of the other. The lower heat exchange box is used to pass oil fumes, and the upper heat exchange box is used to pass fresh air. The two heat exchange boxes are connected by a heat pipe, and a bypass pipe is provided on each side of the heat exchange box.

[0009] A cleaning assembly, comprising a steam cleaning assembly and a waste liquid recovery assembly, wherein the steam cleaning assembly is capable of cleaning the heat pipe using steam;

[0010] The airflow control assembly includes four air collection hoods, each of which simultaneously covers the heat exchange box and the ends of the bypass pipes on both sides. Two dampers are rotatably installed inside each air collection hood, and each damper is connected to a drive structure for driving the dampers to rotate, thereby closing the heat exchange box or bypass pipes.

[0011] Preferably, the heat exchange box and bypass pipe are wrapped with an insulation layer, which is used to reduce heat exchange between the heat exchange components and the outside.

[0012] Preferably, the steam cleaning assembly includes a steam pipe that extends through a bypass pipe below into a heat exchange box below. The steam pipe has several nozzles arranged vertically on it and is used to introduce steam.

[0013] Preferably, the waste liquid recovery assembly includes a waste liquid tank, which is located at the bottom of the heat exchange box below and on both sides of the heat pipe, and the waste liquid tank is lower than the inner bottom surface of the heat exchange box.

[0014] Preferably, waste liquid boxes are connected to both sides of the waste liquid tank via waste liquid pipes, and the waste liquid boxes are slidably connected to the bypass pipe below.

[0015] Preferably, the damper is rotatably installed inside the air collecting hood via a drive shaft, and the upper and lower adjacent drive shafts are connected by a coupling. A limiting rod is provided on the rear side of the damper, which is used to prevent the air collecting hood from deforming and to limit the rotation angle of the damper.

[0016] Preferably, the drive structure is located on the bottom surface of the lower air collecting shroud and connected to two drive shafts inside the air collecting shroud, for driving the two drive shafts to rotate simultaneously in opposite directions.

[0017] Compared with the prior art, the beneficial effects of this utility model are:

[0018] This invention, by setting up an airflow control component, can simultaneously seal both ends of the heat exchange box, reducing airflow turbulence during flue gas exhaust and fresh air intake, thus ensuring exhaust and intake efficiency; by adding an insulation layer, it can reduce heat exchange between the heat exchange components and the outside air, reducing heat loss and improving heat exchange efficiency; by setting up a cleaning component, it can use steam to clean the heat pipes, removing the sludge adhering to the surface and preventing a decrease in heat exchange efficiency; by setting up a waste liquid recovery component, it can collect cleaning waste liquid, reducing environmental pollution. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0020] Figure 2 This is an exploded view of the overall structure of this utility model;

[0021] Figure 3 This is an exploded view of the cleaning component structure in this utility model;

[0022] Figure 4 This is an exploded view of the airflow control component structure in this utility model;

[0023] Figure 5 for Figure 4 Enlarged schematic diagram of the structure at point A in the middle.

[0024] The meanings of the labels in the diagram are as follows:

[0025] 1. Heat exchange assembly; 11. First heat exchange box; 12. Second heat exchange box; 13. Heat pipe; 14. Bypass pipe; 15. Insulation layer;

[0026] 2. Cleaning components; 21. Steam pipe; 22. Nozzle; 23. Waste liquid tank; 24. Waste liquid pipe; 25. Waste liquid box;

[0027] 3. Airflow control components; 31. Air collection hood; 32. Limiting rod; 33. Air damper; 34. Drive shaft; 35. Primary power source; 36. Transmission structure; 37. Coupling. Detailed Implementation

[0028] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0029] Example 1:

[0030] Please see Figure 1-5 The present invention will describe the above technical solution in detail through the following embodiments:

[0031] A heat recovery fume extraction system for public kitchens includes:

[0032] Heat exchange assembly 1 includes two heat exchange boxes stacked one on top of the other. The lower heat exchange box is used to pass oil fumes, and the upper heat exchange box is used to pass fresh air. The two heat exchange boxes are connected by a heat pipe 13. A bypass pipe 14 is provided on each side of the heat exchange box.

[0033] The heat exchange box includes a first heat exchange box 11 and a second heat exchange box 12. Both the first heat exchange box 11 and the second heat exchange box 12 are made of galvanized steel sheet, which is bent and welded. The first heat exchange box 11 is located above the second heat exchange box 12. The first heat exchange box 11 is used to pass fresh air, and the second heat exchange box 12 is used to pass treated oil fumes.

[0034] The heat pipe 13 is inserted from above the first heat exchange box 11, passes through the bottom of the first heat exchange box 11 and the top of the second heat exchange box 12 and enters the second heat exchange box 12.

[0035] When the flue gas passes through the second heat exchange box 12, the heat is transferred to the heat pipe 13. After the heat pipe 13 is heated, the internal heat exchange liquid evaporates and rises to the top, where it exchanges heat with the fresh air in the first heat exchange box 11, heating the fresh air. Then the heat exchange liquid cools down into a liquid and returns to the bottom.

[0036] The bypass pipe 14 is made of the same material as the first heat exchange box 11 and the second heat exchange box 12. The height of the bypass pipe 14 is the same as that of the first heat exchange box 11 and the second heat exchange box 12, and the width is half that of the first heat exchange box 11 and the second heat exchange box 12.

[0037] The heat exchange box and bypass pipe 14 are wrapped with an insulation layer 15, which is used to reduce the heat exchange between the heat exchange assembly 1 and the outside.

[0038] The insulation layer 15 can be made of rock wool or other high-temperature resistant insulation materials.

[0039] The insulation layer 15 can reduce the heat exchange between the first heat exchange box 11 and the second heat exchange box 12 and the outside air, and at the same time, it can reduce the heat exchange between the first heat exchange box 11 and the second heat exchange box 12 and the bypass pipe 14.

[0040] Cleaning component 2 includes a steam cleaning component and a waste liquid recovery component. The steam cleaning component can use steam to clean the heat pipe 13.

[0041] Steam can be generated by a steam generator, which is an existing and well-known device and therefore is not shown in the figure.

[0042] The steam cleaning assembly includes a steam pipe 21, which extends through the lower bypass pipe 14 into the lower heat exchange box. Several nozzles 22 are provided on the steam pipe 21 in the vertical direction. The steam pipe 21 is used to introduce steam.

[0043] Steam pipe 21 is connected to steam generator. After high temperature and high pressure steam is introduced into steam pipe 21, the steam can be sprayed out from nozzle 22 to clean the windward side of heat pipe 13 and remove the oil and sludge attached to the surface.

[0044] It is important to note that cleaning should be done when cooking is not in progress. Additionally, a control valve should be installed at the connection between steam pipe 21 and the steam generator; this valve must be closed when not in use to prevent backflow of flue gas.

[0045] The waste liquid recovery assembly includes a waste liquid tank 23, which is located at the bottom of the heat exchange box and on both sides of the heat pipe 13. The waste liquid tank 23 is lower than the bottom surface of the inner side of the heat exchange box.

[0046] Waste liquid tank 23 is welded to the second heat exchange box 12. The cross-section of waste liquid tank 23 is an inverted trapezoid. Waste liquid after steam cleaning will collect in waste liquid tank 23.

[0047] Waste liquid tank 23 is connected to waste liquid box 25 on both sides by waste liquid pipe 24, and waste liquid box 25 is slidably connected to bypass pipe 14 below.

[0048] Waste liquid pipe 24 is welded to waste liquid tank 23, and the head of waste liquid pipe 24 is inserted into waste liquid box 25 from the side. Waste liquid can be discharged into waste liquid box 25 through waste liquid pipe 24.

[0049] It should be noted that an electromagnetically controlled valve should be installed in the middle of the waste liquid pipe 24. The valve should be closed when not in use to prevent flue gas from entering the waste liquid box 25 from the waste liquid pipe 24, which could lead to flue gas leakage and affect heat exchange.

[0050] The waste liquid container 25 can be slidably connected to the bypass pipe 14 below via a known guide rail or other guiding structure, or it can be slidably achieved by installing casters at the bottom. These are all easily conceivable methods, so they will not be described in detail.

[0051] Waste liquid container 25 needs to be cleaned regularly.

[0052] The airflow control assembly 3 includes four air collection hoods 31, each of which covers both the heat exchange box and the ends of the bypass pipes 14 on both sides. Two dampers 33 are rotatably installed inside the air collection hood 31. The dampers 33 are connected to a drive structure, which is used to drive the dampers 33 to rotate, thereby closing the heat exchange box or the bypass pipe 14.

[0053] The air collection hood 31 is fixedly installed on the end face of the heat exchange box and the bypass pipe 14 by bolts.

[0054] The air collection hoods 31 at both ends of the first heat exchange box 11 are connected to the fresh air fan and the indoor fresh air duct through pipes, respectively.

[0055] The air collection hoods 31 at both ends of the second heat exchange box 12 are connected to the flue gas treatment equipment and the exhaust fan through pipes, respectively.

[0056] It should be noted that the flue gas needs to be treated before it can enter the heat exchange component 1 from the air collection hood 31.

[0057] The damper 33 is rotatably installed inside the air collecting cover 31 via the drive shaft 34. The upper and lower adjacent drive shafts 34 are connected by a coupling 37. A limit rod 32 is provided on the rear side of the damper 33. The limit rod 32 is used to prevent the air collecting cover 31 from deforming and to limit the rotation angle of the damper 33.

[0058] The damper 33 and the drive shaft 34 are snapped together.

[0059] The limiting rod 32 is welded and installed inside the air collector shroud 31 on the side near the heat exchange component 1 to prevent deformation of the air collector shroud 31. The outer side of the limiting rod 32 abuts against the end face of the heat exchange component 1. The spacing of the limiting rods 32 is smaller than the width of the damper 33 to prevent the damper 33 from rotating excessively, and at the same time, it works with the damper 33 to provide a sealing function.

[0060] The drive structure is located on the bottom surface of the lower air collecting shroud 31 and is connected to two drive shafts 34 inside the air collecting shroud 31, for driving the two drive shafts 34 to rotate in opposite directions simultaneously.

[0061] The drive structure includes a first power source 35, which is fixedly mounted on the bottom surface of the lower air collector shroud 31 by screws. The first power source 35 adopts a dual-shaft motor. The output shaft of the first power source 35 is connected to two transmission shafts 34 simultaneously through a transmission structure 36. The transmission structure 36 can adopt a known worm gear reducer, and the transmission shafts 34 are engaged with the worm gear.

[0062] When the first power source 35 is working, it can drive two transmission shafts 34 to rotate in opposite directions through the transmission structure 36, thereby driving the dampers 33 in the lower air collector shroud 31 to rotate in opposite directions. The rotation of the two lower transmission shafts 34 can drive the upper transmission shaft 34 to rotate through the coupling 37, thereby driving the two upper dampers 33 to rotate simultaneously.

[0063] When damper 33 covers bypass pipe 14, fresh air and flue gas pass through the first heat exchange box 11 and the second heat exchange box 12. When damper 33 covers the first heat exchange box 11 and the second heat exchange box 12, fresh air and flue gas pass through bypass pipe 14.

[0064] It should be noted that this device is for outdoor use, and the drive structure needs to be sealed and protected by a protective box or sealed enclosure to prevent rainwater from corroding the drive structure, which could cause the first power source 35 to short-circuit or the transmission structure 36 to corrode and rust.

[0065] Working principle:

[0066] In winter, the first power source 35 is controlled to operate, driving the damper 33 to rotate towards the bypass pipe 14, covering the end face of the bypass pipe 14, so that the treated flue gas passes through the second heat exchange box 12, and the fresh air passes through the first heat exchange box 11. The flue gas exchanges heat with the fresh air in the first heat exchange box 11 through the heat pipe 13, heating the fresh air, reducing indoor heat loss, and achieving the effect of energy saving.

[0067] In summer, the first power source 35 is controlled to operate, driving the damper 33 to rotate towards the heat exchange box, covering the end faces of the first heat exchange box 11 and the second heat exchange box 12, so that flue gas and fresh air pass through the bypass pipe 14, avoiding the fresh air being heated due to heat exchange.

[0068] When there is no smoke exhaust, high-temperature and high-pressure steam can be introduced into the second heat exchange box 12 through steam pipe 21, and steam can be sprayed out through heat pipe 13 to clean the sludge covering the surface of heat pipe 13. The waste liquid after cleaning will fall into the waste liquid tank 23, and then flow into the waste liquid box 25 from the waste liquid pipe 24. The waste liquid box 25 should be cleaned regularly.

[0069] The foregoing has shown and described the basic principles, main features, and advantages of this utility model. Those skilled in the art should understand that this utility model is not limited to the above embodiments. The embodiments and descriptions in the specification are merely preferred examples and are not intended to limit the utility model. Various changes and modifications can be made to this utility model without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claimed utility model. The scope of protection of this utility model is defined by the appended claims and their equivalents.

Claims

1. A heat recovery fume extraction device for public kitchens, characterized in that, include: Heat exchange assembly (1), the heat exchange assembly (1) includes two heat exchange boxes, the two heat exchange boxes are stacked one on top of the other, the lower heat exchange box is used to pass oil fumes, the upper heat exchange box is used to pass fresh air, the two heat exchange boxes are connected by a heat pipe (13), and a bypass pipe (14) is provided on each side of the heat exchange box. Cleaning component (2), the cleaning component (2) includes a steam cleaning component and a waste liquid recovery component, the steam cleaning component is capable of cleaning the heat pipe (13) with steam; The airflow control assembly (3) includes four air collection hoods (31), each of which covers both the heat exchange box and the ends of the bypass pipes (14) on both sides. Two dampers (33) are rotatably installed inside the air collection hoods (31). The dampers (33) are connected to a drive structure, which is used to drive the dampers (33) to rotate, thereby closing the heat exchange box or the bypass pipes (14).

2. The heat recovery and fume extraction device for public kitchens as described in claim 1, characterized in that: The heat exchange box and bypass pipe (14) are wrapped with an insulation layer (15), which is used to reduce the heat exchange between the heat exchange assembly (1) and the outside.

3. The heat recovery and fume extraction device for public kitchens as described in claim 1, characterized in that: The steam cleaning assembly includes a steam pipe (21) that extends through a bypass pipe (14) below into a heat exchange box below. Several nozzles (22) are provided on the steam pipe (21) in the vertical direction. The steam pipe (21) is used to introduce steam.

4. The heat recovery and fume extraction device for public kitchens as described in claim 1, characterized in that: The waste liquid recovery assembly includes a waste liquid tank (23), which is located at the bottom of the heat exchange box below and on both sides of the heat pipe (13). The waste liquid tank (23) is lower than the bottom surface of the inner side of the heat exchange box.

5. The heat recovery and fume extraction device for public kitchens as described in claim 4, characterized in that: Waste liquid tank (23) is connected to waste liquid boxes (25) on both sides by waste liquid pipes (24), and the waste liquid boxes (25) are slidably connected to the bypass pipe (14) below.

6. The heat recovery fume extraction device for public kitchens as described in claim 1, characterized in that: The damper (33) is rotatably installed inside the air collecting cover (31) via a drive shaft (34). The upper and lower adjacent drive shafts (34) are connected by a coupling (37). A limiting rod (32) is provided on the rear side of the damper (33). The limiting rod (32) is used to prevent the air collecting cover (31) from deforming and to limit the rotation angle of the damper (33).

7. The heat recovery and fume extraction device for public kitchens as described in claim 6, characterized in that: The drive structure is located on the bottom surface of the lower air collecting hood (31) and is connected to two drive shafts (34) inside the air collecting hood (31) to drive the two drive shafts (34) to rotate simultaneously in opposite directions.

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