Range hood

Abstract

The utility model discloses a range hood, which comprises a box body, the fan system is arranged in the box body and is provided with a volute, an impeller arranged in the volute and a motor, and a rotating shaft of the motor is connected with the impeller; the piston cylinder is arranged in the box body; the piston inner cover is arranged in the piston cylinder in a sliding manner, and a closed piston cavity is formed between the piston inner cover and the piston cylinder; the piston inner cover is connected with a rotating shaft of the motor through a transmission part, and the transmission part is arranged to be capable of converting rotating power of the rotating shaft of the motor into the mode that the piston inner cover slides back and forth relative to the piston cylinder, so that the size of the piston cavity is alternately increased and decreased; the air inlet end of the air inlet pipe is located inside or outside the box body, and the air outlet end of the air inlet pipe is opened on the cavity wall of the piston cavity and is provided with a first valve for opening and closing the opening of the air outlet end; an air inlet end opening of the air outlet pipe is formed in the cavity wall of the piston cavity and is provided with a second valve for opening and closing the air inlet end opening, and an exhaust end of the air outlet pipe corresponds to the impeller or / and the volute. The utility model is favorable for cleaning the fan system.

Description

Technical Field

[0001] The utility model belongs to the technical field of kitchen appliances, and in particular relates to a range hood. Background Art

[0002] A range hood is a kitchen appliance that purifies the kitchen environment. It uses the negative pressure generated by the internal fan system to suck the fumes generated by cooking into the housing of the range hood, separate and purify the fumes in the housing, and then discharge them from the smoke outlet on the top of the housing. For example, the structures disclosed in the Chinese utility model patent "Ranger hood" with patent number 202322101902.1 (authorization announcement number CN220355500U) and the Chinese utility model patent "Side-suction range hood" with patent number 202222837318.8 (authorization announcement number CN218864276U).

[0003] When the range hood is in use, oil will adhere to the fan system, affecting the normal operation of the fan system. For this reason, the fan system needs to be cleaned. For example, Chinese utility model patent No. 202222853169.4 "A Range Hood" (authorization announcement No. CN218864280U) discloses a range hood, including a fan system and a cleaning device for cleaning the fan system, wherein the fan system includes a volute, an air inlet is formed on the volute, and the cleaning device includes: a liquid storage box for storing a cleaning medium; a water inlet pipe, the water inlet pipe comprising a water inlet pipe input end and a water inlet pipe output end, the water inlet pipe input end being communicated with the inner side of the liquid storage box, the water inlet pipe output end being arranged at the air inlet of the fan system, so that the negative pressure generated at the air inlet can attract the cleaning medium in the liquid storage box; a drain pipe, the drain pipe comprising a drain pipe input end and a drain pipe output end, the drain pipe input end being communicated with the inner side of the bottom of the volute, the drain pipe output end being able to communicate with the liquid storage box, so that the positive pressure generated at the bottom of the volute can press out the cleaning medium in the liquid storage box.

[0004] During actual use, the oil adheres to the fan system, making it difficult to clean, and the cleaning effect needs to be further improved. Utility Model Content

[0005] The technical problem to be solved by the utility model is to provide a range hood which is conducive to cleaning the fan system in view of the current status of the prior art.

[0006] The technical solution adopted by the utility model to solve the above technical problems is: a range hood, comprising:

[0007] The box body is hollow inside to form a chamber with a smoke inlet and a smoke outlet;

[0008] The fan system is arranged in the chamber and comprises a volute, an impeller arranged in the volute and a motor, wherein the rotating shaft of the motor is connected to the impeller and is used to drive the impeller to rotate, thereby driving the oil smoke airflow to be sucked in through the smoke inlet of the box body and discharged through the smoke outlet;

[0009] It is characterized by also including:

[0010] A piston cylinder is disposed in the box;

[0011] A piston inner cover is slidably disposed in the piston cylinder and forms a sealed piston cavity with the piston cylinder; the piston inner cover is connected to the rotating shaft of the motor via a transmission member, and the transmission member is arranged to convert the rotational power of the motor rotating shaft into a reciprocating sliding motion of the piston inner cover relative to the piston cylinder so that the volume of the piston cavity is alternately expanded and reduced;

[0012] An air inlet pipe, whose air inlet end is located inside or outside the box body, whose air outlet end opens on the cavity wall of the piston cavity and is provided with a first valve for opening and closing the air outlet end opening, wherein the first valve is arranged to open when the volume of the piston cavity expands and to close when the volume of the piston cavity decreases;

[0013] An air outlet pipe, whose air inlet end opens on the cavity wall of the piston cavity and is provided with a second valve for opening and closing the air inlet end opening, whose air outlet end is arranged corresponding to the impeller and / or volute, and the second valve is arranged to close when the volume of the piston cavity expands and open after the volume of the piston cavity decreases.

[0014] In this way, the rotation of the motor shaft can drive the piston inner cover to move back and forth, so that the volume of the piston chamber in the piston cylinder is alternately expanded and reduced. When the volume of the piston chamber expands, the airflow inside or outside the box can be sucked into the piston chamber through the intake pipe. When the volume of the piston chamber is reduced, this part of the inhaled gas is compressed. When it is compressed to a certain pressure, the second valve on the outlet pipe opens, and the compressed airflow sprays to the impeller and / or the volute through the outlet pipe. Moreover, since the temperature of the compressed airflow increases, the pressure increases, and the flow rate is faster, the cleaning effect on oil stains is better.

[0015] At the same time, the utility model utilizes the motor in the fan system to drive the piston inner cover, and there is no need to set up an additional driving mechanism.

[0016] Preferably, a filter is provided at the air inlet end of the air inlet pipe and / or the air outlet end of the air outlet pipe. The design of the filter can prevent oil from entering the air inlet pipe and the air outlet pipe.

[0017] Preferably, the piston inner cover is arranged in the piston cylinder in a manner that it can slide up and down, and the air outlet end of the air inlet pipe and the air inlet end of the air outlet pipe are both opened on the top wall of the piston cylinder and opposite to the piston inner cover.

[0018] Furthermore, the air inlet end of the air inlet pipe and the air outlet end of the air outlet pipe are arranged vertically upward or inclined upward.

[0019] Furthermore, the air inlet end of the air inlet pipe and the air outlet end of the air outlet pipe are inclined upward, and the angle between them and the horizontal plane is ≥30°, so as to prevent oil stains from entering the pipe.

[0020] Furthermore, the length of the air inlet pipe is shorter than the length of the air outlet pipe, and the air inlet end of the air inlet pipe is located below the air outlet end of the air outlet pipe.

[0021] Preferably, the edge of the piston inner cover is spaced opposite to the inner wall of the piston cylinder, and the distance between the two is 0.3-0.5 mm;

[0022] The edge of the lower port of the piston cylinder is folded and extended inwardly to form a folded edge, and the width of the folded edge in the extending direction is 1 to 2 mm.

[0023] The folded edge can be used to store a certain amount of lubricating oil and can limit the inner cover of the piston to prevent the inner cover of the piston from falling off during the sliding process.

[0024] In the above solution, preferably, the piston cylinder is located at the inner periphery of the impeller, and the exhaust end of the exhaust pipe is located at the inner periphery of the impeller and is 50-100 mm away from the inner circumference of the impeller, thereby ensuring that the normal operation of the impeller is not affected and a certain cleaning effect is ensured.

[0025] Preferably, the diameter of the air outlet pipe is consistent with that of the air inlet pipe, and both are 10-20 mm, so as to ensure a certain airflow input and output.

[0026] In the above schemes, preferably, the transmission member includes a cam and a connecting rod, the first end of the cam is circumferentially sleeved on the outer circumference of the motor shaft, and the second end of the cam is connected to the first end of the connecting rod.

[0027] A first plug-in column and a first plug-in hole are provided on the connecting rod, and the plug-in direction is consistent with the extension direction of the motor shaft; the second end of the connecting rod and the piston inner cover are provided with a second plug-in column and a second plug-in hole, and the plug-in direction is consistent with the extension direction of the motor shaft.

[0028] Compared with the prior art, the utility model has the advantages that the piston inner cover can be driven to move back and forth by the rotation of the motor shaft, so that the volume of the piston chamber in the piston cylinder is alternately expanded and reduced. When the volume of the piston chamber is expanded, the airflow inside or outside the box can be sucked into the piston chamber through the intake pipe. When the volume of the piston chamber is reduced, this part of the sucked gas is compressed. When it is compressed to a certain pressure, the second valve on the outlet pipe opens, and the compressed airflow is sprayed to the impeller and / or the volute through the outlet pipe. Moreover, since the temperature of the compressed airflow is increased, the pressure is increased, and the flow rate is faster, the cleaning effect on oil stains is better.

[0029] At the same time, the utility model utilizes the motor in the fan system to drive the piston inner cover, and there is no need to set up an additional driving mechanism. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 It is a structural schematic diagram of an embodiment of the utility model;

[0031] Figure 2 It is a cross-sectional view of an embodiment of the utility model (the cross-section is a vertical plane extending front and back);

[0032] Figure 3 Another cross-sectional view of an embodiment of the utility model (the cross-section is a vertical plane extending left and right);

[0033] Figure 4 for Figure 3 Enlarged view of part A in the middle. DETAILED DESCRIPTION

[0034] The present invention will be described in further detail below in conjunction with the accompanying drawings.

[0035] like Figures 1 to 4 As shown, a preferred embodiment of a range hood of the utility model is shown, and the range hood comprises a housing 1, a fan system 2, and a cleaning device for cleaning the fan system 2.

[0036] The box body 1 is hollow inside to form a chamber 10 , a front side wall of the chamber 10 is provided with a smoke inlet 10 a , and a top wall of the chamber 10 is provided with a smoke outlet 10 b .

[0037] The fan system 2 is disposed in the chamber 10 and comprises a volute 21, an impeller 22 disposed in the volute 21, and a motor 23. The motor shaft 231 is connected to the impeller 22 and is used to drive the impeller 22 to rotate, thereby driving the oil smoke flow to be sucked in from the smoke inlet 10a of the box body 1 and discharged from the smoke outlet 10b. The fan system 2 in this embodiment is a prior art and will not be described in detail here.

[0038] The cleaning device comprises a piston cylinder 3 , a piston inner cover 4 , an air inlet pipe 6 and an air outlet pipe 7 .

[0039] The piston cylinder 3 is vertically arranged in the box body 1 , inside the impeller 22 , and above the motor shaft 231 .

[0040] The piston inner cover 4 can be slidably placed in the piston cylinder 3 and form a sealed piston chamber 30 between the piston inner cover 4 and the motor shaft 231 through a transmission member 5, and the transmission member 5 is arranged to convert the rotational power of the motor shaft 231 into a rotation of the piston inner cover 4 relative to the piston cylinder 3 so that the volume of the piston chamber 30 is alternately expanded and reduced. In this embodiment, the edge of the piston inner cover 4 is spaced relative to the inner wall of the piston cylinder 3, and the spacing between the two is 0.3-0.5 mm (can be any value between 0.3-0.5 mm, such as 0.3, 0.4, 0.5 mm, etc.); the edge of the lower port of the piston cylinder 3 is folded and extended inward to form a folded edge 31, and the width of the folded edge 31 in the extension direction is 1-2 mm (can be any value between 1-2 mm, such as 1, 1.2, 1.5, 2 mm, etc.) to prevent the piston inner cover 4 from accidentally detaching from the piston cylinder 3. The transmission member 5 includes a cam 51 and a connecting rod 52. The first end of the cam 51 is sleeved on the outer periphery of the motor shaft 231 along the circumferential direction. The second end of the cam 51 and the first end of the connecting rod 52 are provided with a first plug-in column 511 and a first plug-in hole 521, and the plug-in direction is consistent with the extension direction of the motor shaft 231. The second end of the connecting rod 52 and the piston inner cover 4 are provided with a second plug-in column 41 and a second plug-in hole 522, and the plug-in direction is consistent with the extension direction of the motor shaft 231. Therefore, the rotation of the motor shaft 231 can drive the piston inner cover 4 to move back and forth. For details, please refer to Figure 2 , 4 .

[0041] The air inlet end 6a of the air inlet pipe 6 is located inside the impeller 22, the air outlet end of the air inlet pipe 6 opens at the top wall of the piston chamber 30, and is provided with a first valve 61 for opening and closing the air outlet opening. The first valve 61 is arranged to open when the volume of the piston chamber 30 expands, and to close when the volume of the piston chamber 30 shrinks.

[0042] The air inlet end of the air outlet pipe 7 opens on the top wall of the piston chamber 30 and is provided with a second valve 71 for opening and closing the air inlet end opening. The exhaust end 7b of the air outlet pipe 7 is located at the inner periphery of the impeller 22 and is arranged corresponding to the impeller 22, and the second valve 71 is arranged to close when the volume of the piston chamber 30 expands and open after the volume of the piston chamber 30 shrinks.

[0043] In this embodiment, the air inlet end 6a of the air inlet pipe 6 and the exhaust end 7b of the air outlet pipe 7 are tilted upward, and the angle between the direction and the horizontal plane is ≥30°. At the same time, a filter 8 is provided at the air inlet end 6a of the air inlet pipe 6 and the exhaust end 7b of the air outlet pipe 7 to prevent oil from entering the pipe. At the same time, the length of the air inlet pipe 6 is less than the length of the air outlet pipe 7, and the air inlet end 6a of the air inlet pipe 6 is located below the exhaust end 7b of the air outlet pipe 7. The exhaust end 7b of the air outlet pipe 7 is 50 to 100 mm away from the inner circumference of the impeller 22 (can be any value between 50 and 100 mm, such as 50, 60, 80, 100 mm, etc.), so as not to affect the normal operation of the fan system and ensure the cleaning effect. The diameter of the air outlet pipe 7 is consistent with the diameter of the air inlet pipe 6, and both are 10 to 20 mm (can be any value between 10 and 20 mm, such as 10, 12, 15, 18, 20 mm, etc.).

[0044] Meanwhile, in the present embodiment, the first valve 61 and the second valve 71 are air cushion structures, and the rotation of the air cushions can be controlled according to control instructions to open or close the tube.

[0045] After the range hood is started normally, the motor 23 rotates to drive the cam 51 and the connecting rod 52 to rotate in turn, and then drives the piston inner cover 4 to slide up and down in the piston cylinder 3. When the piston inner cover 4 slides downward, the controller controls the first valve 61 at the lower end of the air inlet pipe 6 to open and the second valve 71 at the lower end of the air outlet pipe 7 to close, so that air is sucked into the piston chamber 30 under the action of atmospheric pressure; when the piston inner cover 4 starts to slide upward, the first and second valves are closed, and the air in the piston chamber 30 is compressed. When compressed to the required pressure, the second valve 71 at the lower end of the air outlet pipe 7 opens, and the compressed air flows out to the surface of the impeller 22 through the air outlet pipe 7. Since the compressed air has a higher temperature and pressure, it has a good cleaning effect on oil stains.

[0046] In the specification and claims of the present invention, terms indicating directions, such as "front", "rear", "up", "down", "left", "right", "side", "top", "bottom", etc., are used to describe various exemplary structural parts and elements of the present invention, but these terms are used here only for the purpose of convenience of description and are determined based on the exemplary orientations shown in the accompanying drawings. Since the embodiments disclosed in the present invention can be arranged in different directions, these terms indicating directions are only used as explanations and should not be regarded as limitations. For example, "up" and "down" are not necessarily limited to directions opposite to or consistent with the direction of gravity.

[0047] The term "vertical" is also used in the specification and claims of the present utility model, which means basically along the up and down direction, and is not limited to the vertical direction only, and can also be slightly inclined relative to the vertical direction.

[0048] The term "radial" is also used in the specification and claims of the present utility model, which means basically along the inward and outward direction, and is not limited to the radial direction passing through the center of the circle, and can also be slightly deviated from the radial direction.

Claims

1. A range hood, comprising: The box body (1) is hollow inside to form a chamber (10) with a smoke inlet (10a) and a smoke outlet (10b); A fan system (2) is arranged in the chamber (10) and comprises a volute (21), an impeller (22) arranged in the volute (21), and a motor (23); a motor shaft (231) is connected to the impeller (22) and is used to drive the impeller (22) to rotate, thereby driving the oil smoke flow to be sucked in through the smoke inlet (10a) of the box body (1) and discharged through the smoke outlet (10b); Features Also included are: A piston cylinder (3) is arranged in the box body (1); A piston inner cover (4) is slidably disposed in the piston cylinder (3) and forms a sealed piston chamber (30) with the piston cylinder (3); the piston inner cover (4) is connected to the motor shaft (231) via a transmission member (5), and the transmission member (5) is arranged to convert the rotational power of the motor shaft (231) into a reciprocating slide of the piston inner cover (4) relative to the piston cylinder (3), thereby causing the volume of the piston chamber (30) to alternately expand and shrink; An air inlet pipe (6), the air inlet end (6a) of which is located inside the housing (1) or outside the housing (1), the air outlet end of which opens on the cavity wall of the piston cavity (30) and is provided with a first valve (61) for opening and closing the air outlet end opening, the first valve (61) being arranged to open when the volume of the piston cavity (30) expands, and to close when the volume of the piston cavity (30) decreases; An air outlet pipe (7) has an air inlet end opening on the cavity wall of the piston cavity (30) and is provided with a second valve (71) for opening and closing the air inlet end opening, and an air outlet end (7b) is arranged corresponding to the impeller (22) and / or the volute (21), and the second valve (71) is arranged to close when the volume of the piston cavity (30) expands and to open when the volume of the piston cavity (30) decreases.

2. The range hood according to claim 1, characterized in that: A filter screen (8) is provided at the air inlet end (6a) of the air inlet pipe (6) and / or at the air outlet end (7b) of the air outlet pipe (7).

3. The range hood according to claim 1, characterized in that: The piston inner cover (4) is arranged in the piston cylinder (3) in a manner that it can slide up and down, and the outlet end of the air inlet pipe (6) and the inlet end of the air outlet pipe (7) are both opened on the top wall of the piston cylinder (3) and are opposite to the piston inner cover (4).

4. The range hood according to claim 3, characterized in that: The air inlet end (6a) of the air inlet pipe (6) and the air outlet end (7b) of the air outlet pipe (7) are arranged vertically upward or inclined upward.

5. The range hood according to claim 4, characterized in that: The air inlet end (6a) of the air inlet pipe (6) and the air outlet end (7b) of the air outlet pipe (7) are inclined upward, and the angle between them and the horizontal plane is ≥30°.

6. The range hood according to claim 4, characterized in that: The length of the air inlet pipe (6) is smaller than the length of the air outlet pipe (7), and the air inlet end (6a) of the air inlet pipe (6) is located below the air outlet end (7b) of the air outlet pipe (7).

7. The range hood according to claim 3, characterized in that: The edge of the piston inner cover (4) is spaced opposite to the inner wall of the piston cylinder (3), and the distance between the two is 0.3-0.5 mm; The edge of the lower port of the piston cylinder (3) is folded and extended inwardly to form a folded edge (31), and the width of the folded edge (31) in the extension direction is 1 to 2 mm.

8. The range hood according to claim 1, characterized in that: The piston cylinder (3) is located inside the impeller (22), and the exhaust end (7b) of the exhaust pipe (7) is located inside the impeller (22) and is 50 to 100 mm away from the inner circumference of the impeller (22).

9. The range hood according to claim 1, characterized in that: The diameter of the air outlet pipe (7) is consistent with the diameter of the air inlet pipe (6), and both are 10 to 20 mm.

10. The range hood according to any one of claims 1 to 9, characterized in that: The transmission member (5) comprises a cam (51) and a connecting rod (52); the first end of the cam (51) is circumferentially sleeved on the outer circumference of the motor shaft (231); the second end of the cam (51) and the first end of the connecting rod (52) are provided with a first plug-in column (511) and a first plug-in hole (521) that are plugged in, and the plug-in direction is consistent with the extension direction of the motor shaft (231); the second end of the connecting rod (52) and the piston inner cover (4) are provided with a second plug-in column (41) and a second plug-in hole (522) that are plug-in, and the plug-in direction is consistent with the extension direction of the motor shaft (231).

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