CN110230832B

CN110230832B - Telescopic negative pressure range hood

Info

Publication number: CN110230832B
Application number: CN201910570060.XA
Authority: CN
Inventors: 艾祎璠; 艾俊亭
Original assignee: Individual
Current assignee: Individual
Priority date: 2019-06-27
Filing date: 2019-06-27
Publication date: 2020-06-30
Anticipated expiration: 2039-06-27
Also published as: CN110230832A

Abstract

The invention discloses a telescopic negative pressure range hood which can solve the problems that when the existing negative pressure range hood is used, the distance between an exhaust hood and a cooking bench is fixed due to the fact that the position of the exhaust hood is fixed, the oil smoke absorption effect is reduced due to the fact that the distance is limited even if the suction force is strong, the angle cannot be adjusted due to the fact that the position of the exhaust hood is fixed, and the existing exhaust hood does not have the function of adjusting the direction and the angle to meet the requirement that oil smoke can be exhausted by the exhaust hood even if the trend of the oil smoke is changed by wind. Including the top case of installation negative pressure air fan, the base of petticoat pipe is taken out in installation and be located the overhead guard between top case, the base, be provided with the air inlet duct on the overhead guard lateral wall, negative pressure air fan installs inside the air inlet duct, install the air inlet duct on the air inlet duct lateral wall, install the filter screen on the air inlet duct, the hydraulic pump that is located the overhead guard top is installed to top bottom of the case portion, the hydraulic pump top is connected with an exhaust duct who is connected with negative pressure air fan.

Description

Telescopic negative pressure range hood

Technical Field

The invention relates to the field of range hoods, in particular to a telescopic negative pressure range hood.

Background

The kitchen ventilator is also called as a range hood, and is a kitchen appliance for purifying the kitchen environment. The smoke exhaust ventilator is installed above a kitchen range, waste burnt by the range and oil smoke harmful to human bodies and generated in the cooking process can be rapidly exhausted out of the range, pollution is reduced, air is purified, the existing smoke exhaust ventilator is mostly a negative pressure smoke exhaust ventilator, a negative pressure motor with high rotating speed is adopted to match with a large-diameter wind wheel, an ultra-strong negative pressure area is manufactured during operation, airflow rises more quickly and violently, strong suction force is formed, the oil smoke can escape everywhere, and a good oil absorption effect is achieved. However, current negative pressure smoke ventilator still has certain defect when using, thereby it is fixed with the top of a kitchen range to extract air cover rigidity, so even suction is powerful, also can be limited to the reason of distance and lead to the reduction of oil absorption cigarette effect, and extract air cover rigidity also can't carry out angle adjustment, it is well known, the kitchen is inside temperature when using is higher, the user often can open the kitchen window, the wind of blowing in from the window can influence the trend of oil smoke this moment, and current smoke ventilator extract air cover does not possess the adjustment direction angle and satisfies the demand that even the oil smoke is changed the trend and also can be taken away by the extract air cover.

Patent publication No. CN101646904B discloses a smoke ventilator, compares with this application, and the smoke ventilator that the comparison document provided can't solve this application and propose: when the existing negative pressure range hood is used, the distance between the exhaust hood and the cooking bench is fixed, so that even if the suction force is strong, the oil fume absorption effect is reduced due to the fact that the distance is limited, and the exhaust hood is fixed in position and cannot be adjusted in angle, so that the existing exhaust hood does not have the problem that the direction angle is adjusted to meet the requirement that the oil fume can be extracted by the exhaust hood even if the trend of the oil fume is changed by wind.

Disclosure of Invention

The invention aims to provide a telescopic negative pressure range hood, which can solve the problems that when the existing negative pressure range hood is used, the position of an air exhaust cover is fixed, so that the distance between the air exhaust cover and a cooking bench is fixed, the oil fume suction effect is reduced due to the fact that the distance is limited even if the suction force is strong, the angle adjustment cannot be carried out due to the fixed position of the air exhaust cover, and the air exhaust cover of the existing range hood does not have the direction angle adjustment to meet the requirement that the oil fume can be exhausted by the air exhaust cover even if the trend of the oil fume is changed by wind.

The purpose of the invention can be realized by the following technical scheme:

a retractable negative pressure smoke exhaust ventilator comprises a top box for mounting a negative pressure fan, a base for mounting a smoke exhaust hood and a top cover positioned between the top box and the base, wherein an air inlet groove is formed in the side wall of the top box, the negative pressure fan is mounted inside the air inlet groove, the air inlet cover is mounted on the side wall of the air inlet groove, a filter screen is mounted on the air inlet cover, a hydraulic pump positioned above the top cover is mounted at the bottom of the top box, an air exhaust pipeline connected with the negative pressure fan is connected to the top of the hydraulic pump, the air exhaust pipeline penetrates through the hydraulic pump and is connected with a first corrugated pipe positioned at the bottom of the hydraulic pump, a hydraulic telescopic rod connected into the base is connected to the bottom of the hydraulic pump, the bottom end of the hydraulic telescopic rod is connected with a movable cover positioned inside the base, a lamp groove is formed, the first corrugated pipe is connected with a second corrugated pipe in the movable cover, the second corrugated pipe is connected with the air exhaust cover, and an air pump is mounted on the side wall of the movable cover;

a smoke exhaust hood is arranged at the bottom of the smoke exhaust hood, a detachable oil box is arranged at the bottom of the smoke exhaust hood, the middle parts of four sides of the top of the air exhaust cover are respectively provided with a hanging slot, four telescopic pipes which can be pulled out and inserted are respectively connected with the four hanging slots, the tops of the four telescopic pipes are all fixed on the inner wall of the movable cover, each telescopic pipe comprises a vertical section, an arc-shaped section and a pneumatic telescopic joint, the vertical section and the arc section are respectively positioned at the head end and the tail end of the telescopic pipe, a vertical pneumatic telescopic rod is connected between the vertical section and the middle part of the telescopic pipe, an arc pneumatic telescopic rod is connected between the arc section and the middle part of the telescopic pipe, a pneumatic telescopic joint connected into the hanging slot is connected on the side wall of the arc section, the vertical pneumatic telescopic rod, the arc-shaped pneumatic telescopic rod and the pneumatic telescopic joint are all connected with the air pump through an independent conduit.

Preferably, the negative pressure fan is connected with the air exhaust cover through an air exhaust pipeline, a first corrugated pipe and a second corrugated pipe which are connected.

Preferably, the movable cover is movably connected with the base through a hydraulic telescopic rod, and the first corrugated pipe stretches when the movable cover moves in the base.

Preferably, the air exhaust cover is hung and connected at a fixed position inside the movable cover through four telescopic pipes initially, when the air exhaust cover needs to be adjusted, the air exhaust cover is movably connected with the movable cover through the telescopic pipes, and the second corrugated pipe stretches when the air exhaust cover moves.

Preferably, the pneumatic expansion joint is matched with the hanging slot, and after the pneumatic expansion joint is connected into the hanging slot, the expansion pipe is stably connected with the air exhaust cover.

Preferably, the air exhaust cover is movably connected with the movable cover in the vertical direction through a vertical pneumatic telescopic rod of the telescopic pipe, and the air exhaust cover is movably connected with the movable cover in the same direction as the arc section through an arc pneumatic telescopic rod of the telescopic pipe.

Preferably, two of the four telescopic tubes face the same direction, and the other two of the four telescopic tubes face the other direction.

Preferably, the use method of the negative pressure range hood comprises the following specific steps:

the method comprises the following steps: when the range hood is started, a negative pressure area and suction force are generated through the negative pressure fan, so that oil smoke is sucked into the exhaust hood after being filtered by the exhaust hood, then is transmitted to the first corrugated pipe through the second corrugated pipe by the exhaust hood, flows to the air inlet groove along the exhaust pipeline after passing through the first corrugated pipe, and is finally discharged from the direction of discharging the exhaust hood;

step two: when the distance from the exhaust hood to the cooking bench needs to be adjusted, the hydraulic telescopic rod is driven by the hydraulic pump to stretch, the hydraulic telescopic rod drives the exhaust hood to move up and down in the stretching process, and the first corrugated pipe stretches and shortens along with the movement of the movable hood when the exhaust hood is driven by the hydraulic telescopic rod to adjust the height, so that the distance from the exhaust hood to the cooking bench is adjusted;

step three: when the direction of the air exhaust cover needs to be adjusted according to the flow direction of oil smoke, the air pump drives the vertical pneumatic telescopic rod to extend to push the air exhaust cover out of the movable cover, then the pneumatic telescopic joints at the bottoms of two telescopic pipes with the same air pump driving direction contract, the direction of the two unselected telescopic pipes is the same as the flow direction of the oil smoke, the contraction of the pneumatic telescopic joints is used for extracting the bottom ends of the telescopic pipes from the interior of the hanging slot, at the moment, the air exhaust cover and the movable cover are hung and connected through the two telescopic pipes which are still connected to the interior of the hanging slot, then the air pump drives the arc-shaped pneumatic telescopic rods at the bottoms of the other two telescopic pipes to stretch, and therefore the air exhaust cover is driven to move in an arc-shaped;

step four: finally, when the air exhaust cover needs to be reset, the air pump is controlled to drive the extended arc-shaped pneumatic telescopic rod to contract and reset, the pneumatic telescopic joint at the bottom of the non-extended telescopic pipe is driven to reset through the air pump and pushed into the hanging slot, at the moment, the four telescopic pipes are hung and connected with the air exhaust cover again, and the air pump is driven to control the four vertical pneumatic telescopic rods to reset, so that the air exhaust cover is taken into the movable cover again.

The invention has the beneficial effects that: the movable cover is connected with the hydraulic telescopic rod, and the movable cover can drive the exhaust cover and the exhaust hood to move up and down in the base, so that the range hood can be started up in the use process, the hydraulic telescopic rod is driven to stretch by the hydraulic pump, the hydraulic telescopic rod drives the exhaust cover to move up and down in the stretching process, the height of the exhaust cover can be adjusted, the distance from the exhaust cover to a cooking bench can be adjusted by the hydraulic pump in the use process of the range hood, and more oil smoke can be exhausted;

because the air exhaust cover is connected with the movable cover through four extension tubes, four hanging slots corresponding to the positions of the extension tubes are arranged at the top of the air exhaust cover, the extension tubes are divided into a vertical section and an arc section, the vertical section is connected with a vertical pneumatic telescopic rod, the arc section is connected with the arc pneumatic telescopic rod, so that the air exhaust cover can drive the vertical pneumatic telescopic rod to extend through an air pump to push the air exhaust cover out of the movable cover in the air exhaust process, then the pneumatic telescopic joints at the bottoms of two extension tubes with the same driving direction of the air pump are controlled to contract through a PLC (programmable logic controller), the direction of the two unselected extension tubes is the same as the flow direction of oil smoke, the bottom ends of the extension tubes are drawn out of the hanging slots by utilizing the contraction of the pneumatic telescopic joints, at the moment, the air exhaust cover and the movable cover are, utilize the PLC controller to control the air pump drive the arc pneumatic telescopic link of two other flexible pipe bottoms flexible to the motion that the arc orbit was done along arc pneumatic telescopic link's direction to drive the cover of bleeding comes to be close to the flow direction of oil smoke, thereby can be more direct and comprehensive take away the oil smoke, effectively avoid blowing the condition that leads to the oil smoke not taken away by the smoke ventilator accuracy because of windowing.

Drawings

In order to facilitate understanding for those skilled in the art, the present invention will be further described with reference to the accompanying drawings.

FIG. 1 is a schematic view of the overall structure of the present invention;

FIG. 2 is an exploded view of the present invention;

FIG. 3 is a schematic view of a movable cover according to the present invention;

FIG. 4 is a schematic view of the structure of the extraction hood of the present invention;

FIG. 5 is a schematic view of a telescopic tube according to the present invention;

FIG. 6 is a schematic view of the pneumatic expansion joint of the present invention after being extended;

in the figure: 1. a top box; 2. an air intake hood; 3. a top cover; 4. a base; 5. a smoke exhaust hood; 6. filtering with a screen; 7. an air inlet groove; 8. a negative pressure fan; 9. a lamp slot; 10. a movable cover; 11. an air extraction hood; 12. an oil box; 13. a hydraulic pump; 14. an air extraction pipeline; 15. a first bellows; 16. a hydraulic telescopic rod; 17. an air pump; 18. a second bellows; 19. a telescopic pipe; 20. hanging the slot; 21. a vertical section; 22. an arc-shaped section; 23. a vertical pneumatic telescopic rod; 24. an arc-shaped hydraulic telescopic rod; 25. a pneumatic expansion joint; 26. a conduit.

Detailed Description

The technical solutions of the present invention will be described clearly and completely with reference to the following embodiments, and it should be understood that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

Referring to fig. 1-6, a retractable negative pressure smoke exhaust ventilator comprises a top box 1 for mounting a negative pressure fan 8, a base 4 for mounting a smoke exhaust hood 5, and a top cover 3 located between the top box 1 and the base 4, wherein an air inlet slot 7 is arranged on the side wall of the top box 1, the negative pressure fan 8 is mounted inside the air inlet slot 7, an air inlet hood 2 is mounted on the side wall of the air inlet slot 7, a filter screen 6 is mounted on the air inlet hood 2, a hydraulic pump 13 located above the top cover 3 is mounted at the bottom of the top box 1, an air exhaust pipeline 14 connected with the negative pressure fan 8 is connected at the top of the hydraulic pump 13, the air exhaust pipeline 14 penetrates through the hydraulic pump 13 and is connected with a first corrugated pipe 15 located at the bottom of the hydraulic pump 13, a hydraulic telescopic rod 16 connected into the base 4 is connected at the bottom of the hydraulic telescopic rod 16, a movable hood 10 located inside the base, an air exhaust cover 11 is arranged in the movable cover 10, a first corrugated pipe 15 is connected with a second corrugated pipe 18 in the movable cover 10, the second corrugated pipe 18 is connected with the air exhaust cover 11, and an air pump 17 is arranged on the side wall of the movable cover 10;

the bottom of the exhaust hood 11 is provided with an exhaust hood 5, the bottom of the exhaust hood 5 is provided with a detachable oil box 12, the middle parts of four sides of the top of the exhaust hood 11 are respectively provided with a hanging slot 20, four hanging slots 20 are respectively connected with an extensible pipe 19 which can be pulled out and inserted, the top parts of four extensible pipes 19 are all fixed on the inner wall of the movable hood 10, each extensible pipe 19 comprises a vertical section 21, an arc section 22, a pneumatic extensible joint 25 and a vertical section 21, the arc sections 22 are respectively located at the head end and the tail end of the telescopic pipe 19, a vertical pneumatic telescopic rod 23 is connected between the vertical section 21 and the middle part of the telescopic pipe 19, an arc pneumatic telescopic rod 24 is connected between the arc sections 22 and the middle part of the telescopic pipe 19, a pneumatic telescopic joint 25 connected into the hanging slot 20 is connected to the side wall of the arc sections 22, and the vertical pneumatic telescopic rod 23, the arc pneumatic telescopic rod 24 and the pneumatic telescopic joint 25 are all connected with the air pump 17 through an independent conduit 26.

The negative pressure fan 8 is connected with the air exhaust hood 11 through the air exhaust pipeline 14, the first corrugated pipe 15 and the second corrugated pipe 18 which are connected, when the range hood is started, the negative pressure fan 8 generates a negative pressure area and suction force, so that oil smoke is sucked into the air exhaust hood 11 after being filtered by the air exhaust hood 5, then the oil smoke is transmitted to the first corrugated pipe 15 through the air exhaust hood 11 through the second corrugated pipe 18, the oil smoke flows to the air inlet groove 7 along the air exhaust pipeline 14 after passing through the first corrugated pipe 15, and finally the oil smoke is discharged from the direction of the exhaust air inlet hood 2.

The movable cover 10 passes through swing joint between hydraulic telescoping rod 16 and the base 4, and the movable cover 10 is flexible at first bellows 15 when base 4 inside activity, make smoke ventilator can be through starting up hydraulic pump 13 in the use, it is flexible to utilize hydraulic pump 13 to drive hydraulic telescoping rod 16, hydraulic telescoping rod 16 is driving the suction hood 11 activity from top to bottom at flexible in-process, thereby can realize the adjustment to the suction hood 11 height, make smoke ventilator can adjust the distance of suction hood 11 to the top of a kitchen range through hydraulic pump 13 in the use, thereby can take away more oil smoke.

The air extraction hood 11 is hung and connected at a fixed position inside the movable hood 10 through four telescopic pipes 19 at the beginning, when the air extraction hood 11 needs to be adjusted, the air extraction hood 11 is movably connected with the movable hood 10 through the telescopic pipes 19, and the second corrugated pipe 18 stretches when the air extraction hood 11 moves.

The pneumatic expansion joint 25 is matched with the hanging slot 20, and after the pneumatic expansion joint 25 is connected into the hanging slot 20, the expansion pipe 19 is stably connected with the air suction cover 11.

The air exhaust cover 11 is movably connected with the movable cover 10 in the vertical direction through a vertical pneumatic telescopic rod 23 of the telescopic pipe 19, the air exhaust cover 11 is movably connected with the movable cover 10 in the same direction as the arc section 22 through an arc pneumatic telescopic rod 24 of the telescopic pipe 19, so that when the direction of the air exhaust cover 11 is required to be adjusted according to the flow direction of oil smoke, the air pump 17 drives the vertical pneumatic telescopic rod 23 to extend to push the air exhaust cover 11 out of the movable cover 10, then the pneumatic telescopic joints 25 at the bottoms of two telescopic pipes 19 in the same driving direction of the air pump 17 contract, the directions of the two unselected telescopic pipes 19 are the same as the flow direction of the oil smoke, the bottom ends of the telescopic pipes 19 are drawn out from the interior of the hanging slot 20 by utilizing the contraction of the pneumatic telescopic joints 25, at the moment, the air exhaust cover 11 and the movable cover 10 are hung through the two, then, the air pump 17 is used to drive the arc pneumatic telescopic rods 24 at the bottoms of the other two telescopic pipes 19 to stretch, so as to drive the air extracting hood 11 to move along the arc tracks along the direction of the arc pneumatic telescopic rods 24 to approach the flow direction of the oil smoke.

Two of the four bellows 19 are oriented in the same direction and the other two are oriented in the other direction.

The use method of the negative pressure range hood comprises the following specific steps:

the method comprises the following steps: when the range hood is started, a negative pressure area and suction force are generated through the negative pressure fan 8, so that oil smoke is sucked into the exhaust hood 11 after being filtered by the exhaust hood 5, then is transmitted to the first corrugated pipe 15 through the second corrugated pipe 18 by the exhaust hood 11, flows to the air inlet groove 7 along the exhaust pipeline 14 after passing through the first corrugated pipe 15, and is finally discharged from the direction of the exhaust air inlet hood 2;

step two: when the distance from the air exhaust cover 11 to the cooking bench needs to be adjusted, the hydraulic pump 13 is used for driving the hydraulic telescopic rod 16 to stretch, the hydraulic telescopic rod 16 drives the air exhaust cover 11 to move up and down in the stretching process, and the first corrugated pipe 15 extends and shortens along with the movement of the movable cover 10 when the air exhaust cover 11 is driven by the hydraulic telescopic rod 16 to adjust the height, so that the distance from the air exhaust cover 11 to the cooking bench is adjusted;

step three: when the direction of the air extraction cover 11 needs to be adjusted according to the flow direction of oil smoke, the air pump 17 drives the vertical pneumatic telescopic rod 23 to extend to push the air extraction cover 11 out of the movable cover 10, then the pneumatic telescopic joints 25 at the bottoms of the two telescopic pipes 19 with the same driving direction of the air pump 17 contract, the directions of the two unselected telescopic pipes 19 are the same as the flow direction of the oil smoke, the bottom ends of the telescopic pipes 19 are extracted from the interior of the hanging slot 20 by utilizing the contraction of the pneumatic telescopic joints 25, at the moment, the air extraction cover 11 and the movable cover 10 are hung and connected through the two telescopic pipes 19 which are still connected in the hanging slot 20, and then the air pump 17 drives the arc-shaped pneumatic telescopic rods 24 at the bottoms of the other two telescopic pipes 19 to extend and contract, so that the air extraction cover 11 is driven to move along the;

step four: finally, when the air exhaust cover 11 needs to be reset, the air pump 17 is controlled to drive the extended arc-shaped pneumatic telescopic rod 24 to contract and reset, then the air pump 17 drives the pneumatic telescopic joint 25 at the bottom of the non-extended telescopic pipe 19 to reset and jack the bottom of the telescopic pipe into the hanging slot 20, at the moment, the four telescopic pipes 19 are hung on the air exhaust cover 11 again, and then the air pump 17 is driven to control the four vertical pneumatic telescopic rods 23 to reset, so that the air exhaust cover 11 is taken into the movable cover 10 again.

The invention has the beneficial effects that: because the movable cover 10 is connected with the hydraulic telescopic rod 16, and the movable cover 10 can drive the exhaust hood 11 and the exhaust hood 5 to move up and down in the base 4, the oil fume exhauster can start the hydraulic pump 13 in the use process, the hydraulic telescopic rod 16 is driven to stretch by the hydraulic pump 13, and the hydraulic telescopic rod 16 drives the exhaust hood 11 to move up and down in the stretching process, so that the height of the exhaust hood 11 can be adjusted, the distance from the exhaust hood 11 to a cooking bench can be adjusted by the hydraulic pump 13 in the use process of the oil fume exhauster, and more oil fume can be exhausted;

because the air exhaust cover 11 is connected with the movable cover 10 through four extension tubes 19, and four hanging slots 20 corresponding to the positions of the extension tubes 19 are arranged at the top of the air exhaust cover 11, the extension tubes 19 are divided into a vertical section 21 and an arc-shaped section 22, the vertical section 21 is connected with a vertical pneumatic telescopic rod 23, and the arc-shaped section 22 is connected with an arc-shaped pneumatic telescopic rod 24, so that the air exhaust cover 11 can drive the vertical pneumatic telescopic rod 23 to extend through an air pump 17 to push the air exhaust cover 11 out of the movable cover 10 in the air exhaust process, and then the pneumatic telescopic joints 25 at the bottoms of two extension tubes 19 with the same driving direction of the air pump 17 are controlled to contract through a PLC (programmable logic controller), the directions of the two unselected extension tubes 19 are the same as the oil fume flow direction, the bottom end of the extension tube 19 is extracted from the interior of the hanging slot 20 by utilizing the contraction of the pneumatic telescopic joints 25, at the moment, the, subsequently, utilize PLC controller control air pump 17 drive the arc pneumatic telescopic link 24 flexible of two other flexible pipe 19 bottoms to it is close to the flow direction of oil smoke to drive the motion that the arc orbit was done along the direction of arc pneumatic telescopic link 24 to extract air cover 11, thereby can be more direct and comprehensive take away the oil smoke, effectively avoid because of the condition that the windowing wind blows and leads to the oil smoke not to be taken away by smoke ventilator accuracy.

When the invention is used, firstly, the whole range hood is assembled, a negative pressure fan 8 is arranged in an air inlet groove 7, an air suction inlet of the negative pressure fan 8 is connected with an air suction pipeline 14, an air outlet of the negative pressure fan 8 is aligned with an air inlet cover 2, the air inlet cover 2 is connected with an air exhaust pipe which is guided to the outside of the range hood, then, the air suction pipeline 14 penetrates through a hydraulic pump 13 and is connected with a first corrugated pipe 15, the first corrugated pipe 15 penetrates through a movable cover 10 and is connected with a second corrugated pipe 18, the second corrugated pipe 18 is connected with an air suction cover 11, then, the air suction cover 11 is arranged in the movable cover 10, the air suction cover 11 is connected through four telescopic pipes 19, then, the movable cover 10 is arranged in a base 4 and is connected with a hydraulic telescopic rod 16, and finally, the negative pressure fan 8, the hydraulic pump 13 and an air pump 17 are all connected with an external PLC controller (model is CPM, and the product can be put into use after being assembled. When the range hood is started, the negative pressure fan 8 generates a negative pressure area and suction force, so that oil smoke is sucked into the exhaust hood 11 after being filtered by the exhaust hood 5, then is transmitted to the first corrugated pipe 15 through the second corrugated pipe 18 by the exhaust hood 11, flows to the air inlet groove 7 along the exhaust pipeline 14 after passing through the first corrugated pipe 15, and finally is discharged from the direction of the exhaust air inlet hood 2. Because the movable hood 10 is connected with the hydraulic telescopic rod 16, the movable hood 10 can drive the exhaust hood 11 and the exhaust hood 5 to move up and down in the base 4, the hydraulic pump 13 can be started by the PLC controller in the use process of the range hood, the hydraulic telescopic rod 16 is driven to stretch by the hydraulic pump 13, the hydraulic telescopic rod 16 drives the exhaust hood 11 to move up and down in the stretching process, the first corrugated pipe 15 extends and shortens along with the movement of the movable hood 10 when the exhaust hood 11 is driven by the hydraulic telescopic rod 16 to adjust the height, the height of the exhaust hood 11 can be adjusted, the distance from the exhaust hood 11 to a cooking bench can be adjusted by the hydraulic pump 13 in the use process of the range hood, and more oil smoke can be pumped; because the air exhaust cover 11 is connected with the movable cover 10 through four extension tubes 19, and four hanging slots 20 corresponding to the positions of the extension tubes 19 are arranged at the top of the air exhaust cover 11, the extension tubes 19 are divided into a vertical section 21 and an arc-shaped section 22, the vertical section 21 is connected with a vertical pneumatic telescopic rod 23, and the arc-shaped section 22 is connected with an arc-shaped pneumatic telescopic rod 24, so that the air exhaust cover 11 can drive the vertical pneumatic telescopic rod 23 to extend through an air pump 17 to push the air exhaust cover 11 out of the movable cover 10 in the air exhaust process, and then the pneumatic telescopic joints 25 at the bottoms of two extension tubes 19 with the same driving direction of the air pump 17 are controlled to contract through a PLC (programmable logic controller), the directions of the two unselected extension tubes 19 are the same as the oil fume flow direction, the bottom end of the extension tube 19 is extracted from the interior of the hanging slot 20 by utilizing the contraction of the pneumatic telescopic joints 25, at the moment, the, then, the PLC controller is used for controlling the air pump 17 to drive the arc-shaped pneumatic telescopic rods 24 at the bottoms of the other two telescopic pipes 19 to extend and retract, thereby driving the air extracting cover 11 to move along the direction of the arc-shaped pneumatic telescopic rod 24 to make an arc-shaped track to approach the flow direction of the oil smoke, thereby being capable of more directly and comprehensively exhausting the oil smoke, effectively avoiding the situation that the oil smoke is not accurately exhausted by the range hood due to the blowing of the windowing wind, finally, when the air exhaust cover 11 needs to be reset, the air pump 17 is controlled by the PLC to drive the extended arc-shaped pneumatic telescopic rod 24 to contract and reset, then the air pump 17 drives the pneumatic expansion joint 25 at the bottom of the non-extended expansion pipe 19 to reset and prop into the hanging slot 20, at the moment, the four expansion pipes 19 are hung on the air exhaust cover 11 again, and then the air pump 17 is driven to control the four vertical pneumatic telescopic rods 23 to reset, so that the air exhaust cover 11 is taken into the movable cover 10 again.

The preferred embodiments of the invention disclosed above are intended to be illustrative only. The preferred embodiments are not intended to be exhaustive or to limit the invention to the precise forms disclosed. Obviously, many modifications and variations are possible in light of the above teaching. The embodiments were chosen and described in order to best explain the principles of the invention and the practical application, to thereby enable others skilled in the art to best utilize the invention. The invention is limited only by the claims and their full scope and equivalents.

Claims

1. The utility model provides a retractable negative pressure smoke ventilator, includes top case (1) of installation negative pressure fan (8), base (4) of installation smoke extraction hood (5) and top cap (3) that is located between top case (1), base (4), its characterized in that, be provided with air inlet duct (7) on top case (1) lateral wall, negative pressure fan (8) are installed inside air inlet duct (7), air inlet duct (7) side wall mounting air inlet hood (2), install filter screen (6) on air inlet hood (2), hydraulic pump (13) that are located top cap (3) top are installed to top case (1) bottom, hydraulic pump (13) top is connected with an air exhaust pipeline (14) that are connected with negative pressure fan (8), air exhaust pipeline (14) run through hydraulic pump (13) and are connected with first bellows (15) that are located hydraulic pump (13) bottom, the bottom of the hydraulic pump (13) is connected with a hydraulic telescopic rod (16) connected into the base (4), the bottom end of the hydraulic telescopic rod (16) is connected with a movable cover (10) positioned inside the base (4), a lamp groove (9) is formed in the outer wall of the bottom of the base (4), an air exhaust cover (11) is installed inside the movable cover (10), the first corrugated pipe (15) is connected with a second corrugated pipe (18) inside the movable cover (10), the second corrugated pipe (18) is connected with the air exhaust cover (11), and an air pump (17) is installed on the side wall of the movable cover (10);

the exhaust hood is characterized in that an exhaust hood (5) is installed at the bottom of the exhaust hood (11), a detachable oil box (12) is installed at the bottom of the exhaust hood (5), four hanging slots (20) are arranged in the middle of four sides of the top of the exhaust hood (11), four telescopic pipes (19) capable of being pulled out and inserted are connected to the four hanging slots (20), the tops of the four telescopic pipes (19) are fixed to the inner wall of the movable hood (10), each telescopic pipe (19) comprises a vertical section (21), an arc-shaped section (22) and a pneumatic telescopic joint (25), the vertical section (21) and the arc-shaped section (22) are respectively located at the head end and the tail end of the telescopic pipe (19), a vertical pneumatic telescopic rod (23) is connected between the middle of the vertical section (21) and the middle of the telescopic pipe (19), and an arc-shaped pneumatic telescopic rod (24) is connected between the arc-shaped, the pneumatic expansion joint (25) connected into the interior of the hanging slot (20) is connected to the side wall of the arc-shaped section (22), and the vertical pneumatic expansion rod (23), the arc-shaped pneumatic expansion rod (24) and the pneumatic expansion joint (25) are connected with the air pump (17) through an independent conduit (26).

2. The retractable negative pressure range hood according to claim 1, wherein the negative pressure fan (8) is connected with the extraction hood (11) through an extraction pipeline (14), a first corrugated pipe (15) and a second corrugated pipe (18) which are connected with each other.

3. The retractable negative pressure range hood according to claim 1, wherein the movable hood (10) is movably connected with the base (4) through a hydraulic telescopic rod (16), and the first corrugated pipe (15) is retracted when the movable hood (10) moves in the base (4).

4. The retractable negative pressure range hood according to claim 1, wherein the suction hood (11) is initially suspended at a fixed position inside the movable hood (10) through four telescopic pipes (19), when the suction hood (11) needs to be adjusted, the suction hood (11) is movably connected with the movable hood (10) through the telescopic pipes (19), and the second corrugated pipe (18) is retracted when the suction hood (11) is moved.

5. The retractable negative pressure range hood according to claim 1, wherein the pneumatic expansion joint (25) is adapted to the hanging slot (20), and after the pneumatic expansion joint (25) is connected to the hanging slot (20), the expansion pipe (19) is stably connected to the suction hood (11).

6. The retractable negative pressure range hood according to claim 1, wherein the extraction hood (11) is movably connected with the movable hood (10) in the vertical direction through a vertical pneumatic telescopic rod (23) of a telescopic pipe (19), and the extraction hood (11) is movably connected with the movable hood (10) in the same direction as the arc section (22) through an arc pneumatic telescopic rod (24) of the telescopic pipe (19).

7. The retractable negative pressure range hood according to claim 1, wherein two of the four telescopic tubes (19) face the same direction, and the other two face the other direction.

8. The retractable negative pressure range hood according to claim 1, wherein the application method of the negative pressure range hood comprises the following specific steps:

the method comprises the following steps: when the range hood is started, a negative pressure area and suction force are generated through the negative pressure fan (8), so that oil smoke is sucked into the exhaust hood (11) after being filtered by the exhaust hood (5), then is transmitted to the first corrugated pipe (15) through the second corrugated pipe (18) by the exhaust hood (11), flows to the air inlet groove (7) along the exhaust pipeline (14) after passing through the first corrugated pipe (15), and is finally discharged from the direction of the exhaust air inlet hood (2);

step two: when the distance from the air extraction cover (11) to the cooking bench needs to be adjusted, a hydraulic pump (13) is used for driving a hydraulic telescopic rod (16) to stretch, the hydraulic telescopic rod (16) drives the air extraction cover (11) to move up and down in the stretching process, and when the air extraction cover (11) is driven by the hydraulic telescopic rod (16) to adjust the height, a first corrugated pipe (15) extends and shortens along with the movement of the movable cover (10), so that the distance from the air extraction cover (11) to the cooking bench is adjusted;

step three: when the direction of the air extraction cover (11) needs to be adjusted according to the flowing direction of oil smoke, the air pump (17) drives the vertical pneumatic telescopic rod (23) to extend to push the air extraction cover (11) out of the movable cover (10), then the pneumatic telescopic joint (25) at the bottoms of the two telescopic pipes (19) with the same driving direction of the air pump (17) contracts, the direction of the two unselected telescopic pipes (19) is the same as the flowing direction of the oil smoke, the bottom ends of the telescopic pipes (19) are extracted from the interior of the hanging slot (20) by utilizing the contraction of the pneumatic telescopic joint (25), at the moment, the air extraction cover (11) and the movable cover (10) are hung and connected through the two telescopic pipes (19) which are still connected in the hanging slot (20), and then the air pump (17) drives the arc-shaped pneumatic telescopic rods (24) at the bottoms of the other two telescopic pipes (19) to extend and retract, so that the air extraction cover (11) is driven to move along the direction of the arc- The direction of the solution is as follows;

step four: finally, when the air exhaust cover (11) needs to be reset, the air pump (17) is controlled to drive the extended arc-shaped pneumatic telescopic rod (24) to contract and reset, the air pump (17) is used for driving the pneumatic telescopic joint (25) at the bottom of the non-extended telescopic pipe (19) to reset and prop into the hanging slot (20), at the moment, the four telescopic pipes (19) are hung on the air exhaust cover (11) again, the air pump (17) is driven to control the four vertical pneumatic telescopic rods (23) to reset, and therefore the air exhaust cover (11) is taken into the movable cover (10) again.