CN218328513U

CN218328513U - Ventilation unit is used in laboratory convenient to filter and collect dust

Info

Publication number: CN218328513U
Application number: CN202222357207.7U
Authority: CN
Inventors: 胡登虎
Original assignee: Shanghai Junbao Environmental Technology Engineering Co ltd
Current assignee: Shanghai Junbao Environmental Technology Engineering Co ltd
Priority date: 2022-09-05
Filing date: 2022-09-05
Publication date: 2023-01-17
Anticipated expiration: 2032-09-05

Abstract

The utility model discloses a ventilation unit is used in laboratory convenient to filter and collect dust, including the air-supply line, the back of air-supply line runs through and installs the filter screen, the mounting panel is installed in the outside of air-supply line, the back mounted of air-supply line has the ventilation pipe, and the ventilation pipe is located the back of filter screen, the internally mounted of ventilation pipe has the ventilation motor, the top of ventilation pipe is run through and is installed the oral siphon, the top of ventilation pipe is run through and is installed the breakwater, and the breakwater is located the front of oral siphon, the utility model discloses an install the filter screen, the filter screen can filter the dust, and staff operation control ware control filters the telescopic link and drives and filter sharp piece and clear away the dust, and the telescopic link drives the switch board simultaneously operation control ware control, makes the air-supply line communicate each other with collecting the box, promotes the fixed block afterwards, makes the fixed block remove fixedly, will collect the box through the handle afterwards and take off, reaches the purpose of filtering the dust and collecting.

Description

Ventilation unit is used in laboratory convenient to filter and collect dust

Technical Field

The utility model relates to a ventilation unit technical field specifically is a ventilation unit is used in laboratory convenient to filter and collect dust.

Background

Ventilation unit is one of the necessary device in laboratory workplace, and ventilation unit can exchange the inside air in laboratory and external air, and often can produce a large amount of dust because of the experiment and float in the air in the laboratory, and in view of this, traditional device is not perfect enough, lacks the device that can make things convenient for the staff to filter and collect the dust, and a ventilation unit is used in laboratory convenient to filter and collect the dust can provide convenient for the staff.

The prior art ventilation device has the following defects:

patent documents: CN216522180U a realize fixed point and concentrate carminative laboratory ventilation unit, "includes the slide rail, the quantity of slide rail is two, the left and right sides face of slide rail inner wall respectively with the mutual joint in left and right ends of two-way lead screw, the right-hand member of two-way lead screw is connected with the left end transmission of motor, the lower surface of movable block inner wall and the mutual overlap joint of lower surface of two lantern rings, the one side that two lantern rings were kept away from mutually respectively with the one end fixed connection of two electric putter opposite faces. This realize fixed point and concentrate carminative laboratory ventilation unit, through setting up two-way lead screw, the lantern ring, movable block and first vent, made things convenient for this exhaust device to induced draft to the appointed region and discharged, when avoiding causing the energy to consume, also improved this ventilation unit's work efficiency, effectually prevented that harmful gas from giving off to whole laboratory in to the possibility that harmful gas caused the injury to operating personnel has been reduced.

However, the ventilation device of the above publication mainly considers the problem of air suction and discharge for a designated area, and there is no device which can facilitate filtering and collecting dust for workers, which is troublesome.

In view of this, it is necessary to develop a ventilation device for a laboratory, which is convenient for dust filtering and collecting, so that the ventilation device can be convenient for workers to filter and collect dust, and convenience is provided for the workers.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide a ventilation unit is used in laboratory convenient to filter and collect dust to solve the problem that proposes in the above-mentioned background art.

In order to achieve the above object, the utility model provides a following technical scheme: a ventilation device convenient for filtering and collecting dust for a laboratory comprises an air inlet pipe, wherein a filter screen is installed on the back surface of the air inlet pipe in a penetrating mode, an installation plate is installed on the outer side of the air inlet pipe, a ventilation pipe is installed on the back surface of the air inlet pipe and located on the back surface of the filter screen, a ventilation motor is installed inside the ventilation pipe, a water inlet pipe is installed on the top of the ventilation pipe in a penetrating mode, a water baffle is installed on the top of the ventilation pipe in a penetrating mode and located on the front surface of the water inlet pipe;

the front of filter screen is connected with the filtration telescopic link, and filters the telescopic link and be connected with the top inner wall of air-supply line, the bottom of filtering the telescopic link is installed and is filtered sharp piece, and filters the surface contact of sharp piece and filter screen, the bottom of air-supply line is connected with collects the box, the bottom of collecting the box is connected with the handle, the diapire inboard of collecting the box is connected with collects the telescopic link.

Preferably, the left side of the air inlet pipe is connected with a controller, the bottom of the air inlet pipe is connected with a protection net in a penetrating mode, and the protection net is located on the front face of the collecting box.

Preferably, the top of the collecting telescopic rod is connected with a switch board, the switch board is in penetrating connection with the bottom of the air inlet pipe, the bottom of the air inlet pipe is connected with a group of supporting blocks, the supporting blocks are located on two sides of the collecting box, the inner sides of the supporting blocks are in penetrating connection with fixing blocks, and the tops of the fixing blocks are in contact with the bottom of the collecting box.

Preferably, a plurality of mounting holes are formed in the front surface and the back surface of the mounting plate in a penetrating manner.

Preferably, the back of the ventilation pipe is connected with a ventilation net.

Preferably, the outside of ventilation motor is connected with the support ring, and the top and the bottom of support ring are connected with a plurality of bracing pieces, and the other end of bracing piece is connected with the inner wall of ventilation pipe, and the output of ventilation motor is connected with the rotary rod, and the outside of rotary rod is connected with rotatory flabellum.

Preferably, the outside of oral siphon is connected with the solenoid valve that entries, and the bottom through connection of ventilation pipe has the outlet pipe, and the outlet pipe is located rotating fan's bottom, and the outside of outlet pipe is connected with out the water solenoid valve, and goes out the water solenoid valve and be located the bottom of ventilation pipe, and the outside of outlet pipe is connected with solid fixed ring, and solid fixed ring is connected with the left side of ventilation pipe.

Preferably, the top of breakwater is connected with the dog, the top of dog is connected with the connecting rod, the bottom of connecting rod is connected with the support telescopic link, the top through connection of ventilation pipe has the division board, and the division board is located the back of oral siphon, the inboard of division board runs through and has seted up connecting groove, the bottom through connection of ventilation pipe has the connecting plate, semicircular groove has been seted up to the inboard of connecting plate, a set of fixed slot has been seted up to the inner wall of ventilation pipe, and the top of fixed slot link up with the top of ventilation pipe mutually, the opening has been seted up to the bottom of fixed slot, and the opening is located the outside of connecting plate.

Compared with the prior art, the beneficial effects of the utility model are as follows:

1. the utility model discloses an install the filter screen, the filter screen can provide the circulation passageway for the air, can adsorb the dust in the interception air simultaneously, the staff can operation controller control filter the telescopic link and stretch out and draw back, it can drive the filter tip piece together to clear away the work and drive the dust together to the dust on filter screen surface to make the filter telescopic link, the staff can operation controller control collection telescopic link simultaneously and stretch out and draw back, it can drive the flush mounting plate of switch board together to make the air-supply line communicate with collection box each other to make the collection telescopic link, make the dust can be filtered the tip piece and drive and get into and collect in the collection box and collect, the staff need promote the fixed block afterwards, make the fixed block remove and remove the fixed to collecting the box in the supporting shoe, the staff can take off the collection box through the handle afterwards, reach the mesh of filtering and collecting the dust, it is convenient to provide for the staff.

2. The utility model discloses an install the breakwater, the staff can be linked together external water source and oral siphon, a plurality of support telescopic link extensions of operation controller control afterwards, make a plurality of support telescopic links can drive the breakwater, division board and connecting plate together inwards move, make the breakwater can remove and contact the diapire of ventilation pipe along the fixed slot, make the division board can remove and make connecting groove contact the surface of rotary rod along the fixed slot, make the connecting plate can pass through opening rebound and along the connecting groove rebound of division board, make semicircular groove can contact the surface of rotary rod, make division board and connecting plate can fix the rotary rod through connecting groove and semicircular groove, and make ventilation motor and positive space be separated, the staff can operation controller control the oral siphon to open by the solenoid valve afterwards, make external water source can get into in the ventilation pipe through the oral siphon and by the breakwater, division board and connecting plate keep apart, make the water source can carry out cleaning work to the pairing rotation, operation controller control the oral siphon to close the oral siphon and control the outlet pipe afterwards, make the outlet pipe take impurity away from the intraductal through the outlet pipe, make the device can obtain the function of clean rotation, it is convenient for the staff to provide the flabellum for the staff.

Drawings

Fig. 1 is a perspective view of the present invention;

FIG. 2 is a schematic view of the inner structure of the air inlet pipe of the present invention;

FIG. 3 is a schematic view of the bottom structure of the air inlet pipe of the present invention;

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

fig. 5 is a schematic diagram of the structure of the isolation board of the present invention.

In the figure: 1. an air inlet pipe; 101. a controller; 102. a protection net; 2. a filter screen; 201. filtering the telescopic rod; 202. filtering the sharp block; 203. a collection box; 204. a grip; 205. collecting the telescopic rods; 206. a switch plate; 207. a supporting block; 208. a fixed block; 3. mounting a plate; 301. mounting holes; 4. a vent pipe; 401. a ventilation net; 5. a ventilation motor; 501. a support ring; 502. a support bar; 503. rotating the rod; 504. rotating the fan blades; 6. a water inlet pipe; 601. an inlet electromagnetic valve; 602. a water outlet pipe; 603. a water outlet electromagnetic valve; 604. a fixing ring; 7. a water baffle; 701. a stopper; 702. a connecting rod; 703. supporting the telescopic rod; 704. a separator plate; 705. a connecting groove; 706. a connecting plate; 707. a semicircular groove; 708. fixing grooves; 709. and (4) opening.

Detailed Description

The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts belong to the protection scope of the present invention.

In the description of the present invention, it should be noted that the terms "upper", "lower", "inner", "outer", "front end", "rear end", "both ends", "one end", "the other end" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplification of description, but do not indicate or imply that the device or element to which the reference is made must have a specific orientation, be constructed in a specific orientation, and be operated, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and the like are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.

In the description of the present invention, it is to be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "disposed," "connected," and the like are to be construed broadly, and for example, "connected" may be either fixedly connected or detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present invention can be understood as a specific case by those skilled in the art.

Referring to fig. 1, 2, 3, 4 and 5, a ventilation device for a laboratory is provided to facilitate dust filtration and collection;

the air inlet pipe comprises an air inlet pipe 1, wherein a controller 101 is connected to the left side of the air inlet pipe 1, a protection net 102 is connected to the bottom of the air inlet pipe 1 in a penetrating manner, the protection net 102 is positioned on the front side of a collection box 203, the air inlet pipe 1 can support the controller 101 and the protection net 102, the controller 101 can control a filtering telescopic rod 201, a collection telescopic rod 205, a ventilation motor 5, a water inlet electromagnetic valve 601, a water outlet electromagnetic valve 603 and a support telescopic rod 703 to start, the protection net 102 can protect the air inlet pipe 1 and prevent impurities from entering the air inlet pipe 1 to be damaged, a filter screen 2 is installed on the back side of the air inlet pipe 1 in a penetrating manner, a mounting plate 3 is installed on the outer side of the air inlet pipe 1, a plurality of mounting holes 301 are formed in the front side and the back side of the mounting plate 3 in a penetrating manner, the air inlet pipe 1 can support the filter screen 2 and the mounting plate 3, the filter screen 2 can filter dust, and the mounting plate 3 can install the device at a working place through the mounting holes 301, the ventilating pipe 4 is installed on the back of the air inlet pipe 1, the ventilating pipe 4 is located on the back of the filter screen 2, the ventilating net 401 is connected to the back of the ventilating pipe 4, the air inlet pipe 1 can support the ventilating pipe 4, the ventilating pipe 4 can provide a channel for the device to be connected with the outside, the ventilating net 401 can prevent external impurities from entering the device to be damaged, the ventilating motor 5 is installed inside the ventilating pipe 4, the supporting ring 501 is connected to the outside of the ventilating motor 5, the supporting rods 502 are connected to the top and the bottom of the supporting ring 501, the other end of each supporting rod 502 is connected with the inner wall of the ventilating pipe 4, the output end of the ventilating motor 5 is connected with a rotating rod 503, the rotating blades 504 are connected to the outside of the rotating rod 503, the ventilating pipe 4 can support the supporting rods 502, the supporting rods 502 can support the supporting ring 501, and the supporting ring 501 can support the ventilating motor 5, ventilation motor 5 can start and drive rotary rod 503 and rotating fan blade 504 and rotate under controller 101's control, the top of ventilation pipe 4 is run through and is installed oral siphon 6, the top of ventilation pipe 4 is run through and is installed breakwater 7, and breakwater 7 is located oral siphon 6's front, ventilation pipe 4 can provide the support for oral siphon 6 and breakwater 7, oral siphon 6 can provide the water source of clean rotating fan blade 504, breakwater 7 can prevent that water source contact ventilation motor 5 and other devices from producing the damage.

Referring to fig. 2 and 3, a ventilation device for a laboratory for filtering and collecting dust conveniently;

the air inlet pipe comprises a filter screen 2, a filter telescopic rod 201 is connected to the front side of the filter screen 2, the filter telescopic rod 201 is connected with the inner wall of the top of an air inlet pipe 1, a filter tip block 202 is installed at the bottom of the filter telescopic rod 201, the filter tip block 202 is contacted with the surface of the filter screen 2, a collection box 203 is connected to the bottom of the air inlet pipe 1, a handle 204 is connected to the bottom of the collection box 203, a collection telescopic rod 205 is connected to the inner side of the bottom wall of the collection box 203, a switch board 206 is connected to the top of the collection telescopic rod 205, the switch board 206 is in penetrating connection with the bottom of the air inlet pipe 1, a group of supporting blocks 207 is connected to the bottom of the air inlet pipe 1, the supporting blocks 207 are located on two sides of the collection box 203, a fixed block 208 is connected to the inner side of the supporting block 207 in penetrating connection, the top of the fixed block 208 is contacted with the bottom of the collection box 203, the air inlet pipe 1 can provide support for the filter screen 2, the filter telescopic rod 201 and the supporting blocks 207, the telescopic filtering rod 201 can provide support for the filtering tip block 202, the supporting block 207 can provide support for the fixing block 208, the fixing block 208 can fix the collecting box 203, the collecting box 203 can provide support for the handle 204, the telescopic collecting rod 205 and the switch board 206, the filtering net 2 can provide a circulation channel for air and can adsorb and intercept dust in the air, a worker can operate the controller 101 to control the telescopic filtering rod 201 to stretch, so that the telescopic filtering rod 201 can drive the filtering tip block 202 to clean dust on the surface of the filtering net 2 together under the action of external force and drive the dust to move together under the action of external force, meanwhile, the worker can operate the controller 101 to control the telescopic collecting rod 205 to stretch, so that the telescopic collecting rod 205 can drive the switch board 206 to move together under the action of external force and the air inlet pipe 1 and the collecting box 203 are communicated with each other, make the dust can be driven by filtering sharp piece 202 and get into and collect in the box 203 under the effect of external force, the staff need promote fixed block 208 afterwards, make fixed block 208 remove in supporting shoe 207 and remove the fixed to collecting box 203 under the effect of external force, the staff can take off collecting box 203 under the effect of external force through handle 204 afterwards.

Referring to fig. 1, 4 and 5, a ventilation device for a laboratory for filtering and collecting dusts is provided;

comprises a water baffle 7, the outer side of an inlet pipe 6 is connected with an inlet electromagnetic valve 601, the bottom of a ventilation pipe 4 is connected with a water outlet pipe 602 in a penetrating way, the water outlet pipe 602 is positioned at the bottom of a rotating fan blade 504, the outer side of the water outlet pipe 602 is connected with a water outlet electromagnetic valve 603, the water outlet electromagnetic valve 603 is positioned at the bottom of the ventilation pipe 4, the outer side of the water outlet pipe 602 is connected with a fixing ring 604, the fixing ring 604 is connected with the left side of the ventilation pipe 4, the top of the water baffle 7 is connected with a block 701, the top of the block 701 is connected with a connecting rod 702, the bottom of the connecting rod 702 is connected with a supporting telescopic rod 703, the top of the ventilation pipe 4 is connected with a separation plate 704 in a penetrating way, the separation plate 704 is positioned at the back of the inlet pipe 6, the inner side of the separation plate 704 is provided with a connecting groove 705 in a penetrating way, the bottom of the ventilation pipe 4 is connected with a connecting plate 706 in a penetrating way, the inner side of the connecting plate 706 is provided with a semicircular groove 707, the inner wall of the ventilation pipe 4 is provided with a group of a fixing groove 708, the top of the fixing groove 708 is communicated with the top of the ventilation pipe 4, the bottom of the fixing groove 708 is provided with an opening 709, the opening 709 is located on the outer side of the connecting plate 706, the ventilation pipe 4 can provide support for the water inlet pipe 6, the water outlet pipe 602, the fixing ring 604 and the supporting telescopic rods 703, the water inlet pipe 6 can provide support for the water inlet electromagnetic valve 601, the water outlet pipe 602 can provide support for the water outlet electromagnetic valve 603, the fixing ring 604 can provide support for the water outlet pipe 602, the supporting telescopic rods 703 can provide support for the connecting rod 702 and the stoppers 701, the plurality of stoppers 701 can provide support for the water baffles 7, the isolating plates 704 and the connecting plate 706 connected with the stoppers 701, an external water source can be communicated with the water inlet pipe 6 by a worker, and then the controller 101 is operated to control the plurality of supporting telescopic rods 703 to extend to enable the plurality of supporting telescopic rods 703 to drive the water baffles 7, the water baffles 7, the partition 704 and the connecting plate 706 move inwards together, so that the water baffle 7 can move along the fixing groove 708 and contact the bottom wall of the ventilation pipe 4 under the action of external force, the partition 704 can move along the fixing groove 708 and the connecting groove 705 can contact the upper surface of the rotating rod 503 under the action of external force, the connecting plate 706 can move upwards through the opening 709 and move upwards along the connecting groove 705 of the partition 704 under the action of external force, the semicircular groove 707 can contact the lower surface of the rotating rod 503, the partition 704 and the connecting plate 706 can fix the rotating rod 503 through the connecting groove 705 and the semicircular groove 707 under the action of external force, the ventilation motor 5 is separated from the space on the front side, then a worker can operate the controller 101 to control the water inlet electromagnetic valve 601 to open the water inlet pipe 6, an external water source can enter the ventilation pipe 4 through the water inlet pipe 6 and be isolated by the water baffle 7, the partition 704 and the connecting plate 706 under the action of external force, the water source can clean the rotating fan blades 504 under the action of external force, then operate the controller 101 to control the water inlet electromagnetic valve 601 to close the water inlet pipe 6 and control the water outlet electromagnetic valve 603 to open the water outlet pipe 602, and enable the water flow to carry impurities out of the ventilation pipe 602.

The working principle is as follows: whether the device has the problem of influencing use or not is checked before the device is used, when a worker needs to use the device, the device is firstly installed at a proper working place through the installation plate 3 and the installation hole 301, then the controller 101 is operated to control the ventilation motor 5 to be started, then the controller 101 is operated to control the filtering telescopic rods 201 and the collecting telescopic rods 205 to collect dust, then the controller 101 is operated to close the ventilation motor 5 and control the plurality of supporting telescopic rods 703 to extend, and then the controller 101 is operated to control the water inlet electromagnetic valve 601 to open the water inlet pipe 6.

It will be evident to those skilled in the art that the invention is not limited to the details of the foregoing illustrative embodiments, and that the present invention may be embodied in other specific forms without departing from the spirit or essential attributes thereof. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. Any reference sign in a claim should not be construed as limiting the claim concerned.

Claims

1. The utility model provides a ventilation unit is used in laboratory convenient to filter and collect dust, includes air-supply line (1), its characterized in that: the air inlet pipe is characterized in that a filter screen (2) is installed on the back face of the air inlet pipe (1) in a penetrating mode, an installation plate (3) is installed on the outer side of the air inlet pipe (1), a ventilation pipe (4) is installed on the back face of the air inlet pipe (1), the ventilation pipe (4) is located on the back face of the filter screen (2), a ventilation motor (5) is installed inside the ventilation pipe (4), a water inlet pipe (6) is installed on the top of the ventilation pipe (4) in a penetrating mode, a water baffle (7) is installed on the top of the ventilation pipe (4) in a penetrating mode, and the water baffle (7) is located on the front face of the water inlet pipe (6);

the front of filter screen (2) is connected with filters telescopic link (201), and filters telescopic link (201) and is connected with the top inner wall of air-supply line (1), the bottom of filtering telescopic link (201) is installed and is filtered sharp piece (202), and filters the surface contact of sharp piece (202) and filter screen (2), the bottom of air-supply line (1) is connected with collects box (203), the bottom of collecting box (203) is connected with handle (204), the diapire inboard of collecting box (203) is connected with collects telescopic link (205).

2. A laboratory ventilation apparatus for facilitating the filtration of collected dust according to claim 1, wherein: the left side of the air inlet pipe (1) is connected with a controller (101), the bottom of the air inlet pipe (1) is connected with a protection net (102) in a penetrating mode, and the protection net (102) is located on the front face of the collecting box (203).

3. The laboratory ventilating device for filtering and collecting dusts according to claim 1, wherein: the top of collecting telescopic link (205) is connected with switch board (206), and bottom through connection of switch board (206) and air-supply line (1), and the bottom of air-supply line (1) is connected with a set of supporting shoe (207), and supporting shoe (207) are located the both sides of collecting box (203), and the inboard through connection of supporting shoe (207) has fixed block (208), and the top of fixed block (208) and the bottom of collecting box (203) are contacted.

4. The laboratory ventilating device for filtering and collecting dusts according to claim 1, wherein: the front and the back of the mounting plate (3) are provided with a plurality of mounting holes (301) in a penetrating way.

5. The laboratory ventilating device for filtering and collecting dusts according to claim 1, wherein: the back of the ventilation pipe (4) is connected with a ventilation net (401).

6. The laboratory ventilating device for filtering and collecting dusts according to claim 1, wherein: the outside of ventilation motor (5) is connected with support ring (501), and the top and the bottom of support ring (501) are connected with a plurality of bracing pieces (502), and the other end of bracing piece (502) is connected with the inner wall of ventilation pipe (4), and the output of ventilation motor (5) is connected with rotary rod (503), and the outside of rotary rod (503) is connected with rotating fan blade (504).

7. The laboratory ventilating device for filtering and collecting dusts according to claim 1, wherein: the outside of oral siphon (6) is connected with into water solenoid valve (601), and the bottom through connection of ventilation pipe (4) has outlet pipe (602), and outlet pipe (602) is located the bottom of rotating fan blade (504), and the outside of outlet pipe (602) is connected with out water solenoid valve (603), and goes out water solenoid valve (603) and be located the bottom of ventilation pipe (4), and the outside of outlet pipe (602) is connected with solid fixed ring (604), and solid fixed ring (604) are connected with the left side of ventilation pipe (4).

8. A laboratory ventilation apparatus for facilitating the filtration of collected dust according to claim 1, wherein: the top of breakwater (7) is connected with dog (701), the top of dog (701) is connected with connecting rod (702), the bottom of connecting rod (702) is connected with support telescopic link (703), the top through connection of ventilation pipe (4) has division board (704), and division board (704) are located the back of oral siphon (6), connecting groove (705) have been run through to the inboard of division board (704), the bottom through connection of ventilation pipe (4) has connecting plate (706), semicircular groove (707) have been seted up to the inboard of connecting plate (706), a set of fixed slot (708) have been seted up to the inner wall of ventilation pipe (4), and the top of fixed slot (708) link up with the top of ventilation pipe (4) mutually, opening (709) have been seted up to the bottom of fixed slot (708), and opening (709) are located the outside of connecting plate (706).