CN112618773B

CN112618773B - Negative pressure aerosol sterilizer for dentistry

Info

Publication number: CN112618773B
Application number: CN202011577238.2A
Authority: CN
Inventors: 苏俊锋; 丁晓东; 闵昌林; 黄伟忠
Original assignee: Jiangsu Juguang Photoelectric Technology Co ltd
Current assignee: Jiangsu Juguang Photoelectric Technology Co ltd
Priority date: 2020-12-28
Filing date: 2020-12-28
Publication date: 2022-05-06
Anticipated expiration: 2040-12-28
Also published as: CN112618773A

Abstract

The invention relates to a dental negative-pressure aerosol disinfection machine which comprises a main machine shell, wherein a vertical support pipe is upwards arranged on the main machine shell, a balance universal joint device is arranged at the top of the support pipe, a hard arm pipe is arranged on the balance universal joint device, the rear end of the hard arm pipe is hermetically connected with a downward rear hose through an elbow, the lower end of the rear hose extends into the main machine shell from the top of the main machine shell, the front end of the hard arm pipe is hermetically connected with a front hose, the front end of the front hose is connected with an aerosol collecting cover, and the middle section in the main machine shell is provided with an ultraviolet lamp tube, a primary screen, a high-efficiency filter screen and a turbo fan which are sequentially arranged from top to bottom. The dental negative-pressure aerosol sterilizer can quickly collect and isolate a large amount of aerosol generated during treatment of dental patients and gas exhaled by the patients, and perform dynamic, safe and thorough sterilization and purification treatment, and has the advantages of timeliness, convenience, safety and high efficiency.

Description

Negative pressure aerosol sterilizer for dentistry

Technical Field

The invention relates to a dental negative pressure aerosol sterilizer, and belongs to the field of medical sterilizing instruments.

Background

At present, the spreading speed of infectious diseases is very high, particularly, infectious sources are spread through air, spray, aerosol and the like, and oral, nasal and respiratory infectious diseases seriously threaten high-risk groups, particularly the health of medical care personnel. When a clinical dentist carries out treatment on a dental patient and the respiratory tract infectious patient is rescued, the risk of exhaled gas and coughed aerosol infection of the patient is the greatest, the medical care personnel only protect the respiratory tract infectious diseases and the aerosol by using a mask, and no effective protection means exists all the time. The dynamic air sterilizer widely used clinically at present can only sterilize the whole room, can achieve certain effect after repeated circulation, and cannot meet the clinical requirements at present. Particularly, recently, the new crown virus has a serious epidemic situation, and many dental clinics stop the patient visit, so that it is necessary to find a method for dynamically, safely and thoroughly sterilizing aerosol and infectious sources of respiratory infectious diseases generated during the treatment of dental patients in a short time and has important clinical significance.

Disclosure of Invention

The invention aims to overcome the defects and provide the dental negative-pressure aerosol disinfection machine which can quickly collect and isolate a large amount of aerosol generated during treatment of dental patients and gas exhaled by the patients, dynamically, safely and thoroughly disinfect and purify the aerosol, and is timely, convenient, safe and efficient.

The purpose of the invention is realized as follows:

a dental negative-pressure aerosol disinfection machine comprises a main case, wherein a main handle is arranged on the main case, a vertical lower guide pipe is arranged at the upper section in the main case, the top of the lower guide pipe is positioned on the top surface of the main case, a locking sleeve is arranged at the top of the lower guide pipe, an upright support pipe is upwards arranged in the lower guide pipe, the upright support pipe can slide up and down along the lower guide pipe and can be locked by the locking sleeve, a balance universal joint device is arranged at the top of the upright support pipe, a hard arm pipe is arranged on the balance universal joint device, the rear end of the hard arm pipe is hermetically connected with a downward rear hose through an elbow, the lower end of the rear hose extends into the main case from the top of the main case, a front hose is hermetically connected at the front end of the hard arm pipe, an aerosol collecting cover is connected at the front end of the front hose, and a cover handle is arranged at the connection position of the front hose and the aerosol collecting cover; the bottom of host computer shell is provided with the truckle, the middle section in the host computer shell is provided with from last ultraviolet tube, the just net of imitating, high-efficient filter screen and the turbofan of arranging extremely down in proper order.

Preferably, the balance universal joint device comprises a vertical rotating shaft and a vertical rotating shaft, the vertical rotating shaft is vertically arranged in an upper end hole of the vertical supporting pipe and can rotate in the upper end hole of the vertical supporting pipe, a longitudinal hole is formed in the upper end of the vertical rotating shaft, the vertical rotating shaft is arranged in the longitudinal hole, a transverse support plate is arranged above the vertical rotating shaft, the support plate is rotatably connected with the vertical rotating shaft through the longitudinal rotating shaft, a cam plate is arranged on the right side of the vertical rotating shaft and comprises a vertical mounting section, a leftward embedding section is arranged at the top of the mounting section, an adjusting section is obliquely arranged at the lower end of the mounting section towards the right lower side, a rightward convex cam section is arranged at the lower end of the adjusting section, the lower end of the cam section abuts against the right side wall of the vertical rotating shaft towards the left, the mounting section of the cam plate is fixed on the right side wall of the upper section of the vertical rotating shaft through a leftward fastening screw, an embedding groove is formed in the right side wall of the upper section of the vertical rotating shaft, the embedding section of the cam plate is embedded in the embedding groove, the support plate is fixedly connected with the hard arm pipe, a longitudinal spring shaft is arranged on the right section of the support plate, a downward torsion spring is connected to the spring shaft, a foot at the upper end of the torsion spring abuts against the bottom surface of the support plate, a foot at the lower end of the torsion spring is provided with a leftward arc-shaped convex block, and the arc-shaped convex block is in sliding contact with the cam plate.

Preferably, the damping plate is sleeved on the longitudinal rotating shaft between the vertical rotating shaft and the support plate.

Preferably, the cam section comprises an upper cam section, a lower cam section and an inflection point between the upper cam section and the lower cam section, the lower part of the lower cam section is connected with the cam jacking section, the convex surface of the upper cam section faces obliquely upward, and the convex surface of the lower cam section faces obliquely downward.

Preferably, a pressure regulating jackscrew from left to right is arranged in the vertical rotating shaft corresponding to the left side of the regulating section of the cam plate, and the right end of the pressure regulating jackscrew penetrates through the vertical rotating shaft to abut against the left side wall of the regulating section.

Preferably, the aerosol collecting cover comprises an outer cover shell, the outer cover shell is provided with a horn opening which inclines downwards, an inner cover plate is arranged at the middle upper section of the opening of the outer cover shell, the inner cover plate retracts a certain distance relative to the outer edge of the opening of the outer cover shell, a positive-negative ion generator is arranged on the back surface of the inner cover plate, a connecting pipe is arranged at the connection position of the rear end of the outer cover shell, the front end of the connecting pipe is inserted into the outer cover shell, the rear end of the connecting pipe extends to the rear side of the outer cover shell, a drainage water retaining brim which inclines upwards and rightwards is arranged on the inner wall of the outer cover shell at the position corresponding to the lower part of the front end of the connecting pipe, an arc-shaped notch is arranged at the bottom of the inner cover plate, a plurality of outer edge air suction slotted holes which are annularly arranged are arranged on the annular edge of the front outer edge of the inner cover plate, a plurality of inner air suction holes which are linearly arranged at intervals are arranged on the outer edge air suction slotted holes and form a circle with the inner air suction slotted holes, the base of inner cover plate is provided with limit baffle downwards, the opening part hypomere of outer housing is provided with can dismantle the ponding box of connection, the ponding box has two ponding grooves that the opening makes progress, and two ponding grooves are interior ponding groove and outer ponding groove respectively, the baffle in the middle of interior ponding groove and the outer ponding groove is called the location division board, and the baffle is called interior baffle in addition of the inboard of interior ponding groove, and the baffle is called outer baffle in addition in the outer ponding groove outside.

Preferably, the rear end of the connecting pipe is provided with a sealing ring groove backwards, and the front end of the front hose is inserted into the sealing ring groove.

Preferably, the outer edge suction slot holes are narrow slot type holes arranged at intervals.

Preferably, the front surface of the limit baffle is provided with a first magnet, and the back surface of the positioning partition plate is provided with a second magnet.

Preferably, the bell-mouth outer ring of the outer casing is provided with a bearing platform, and the lower end of the water accumulation box is placed on the bottom bearing platform of the outer casing.

Compared with the prior art, the invention has the beneficial effects that:

the dental negative-pressure aerosol sterilizer can quickly collect and isolate a large amount of aerosol generated during treatment of dental patients and gas exhaled by the patients, and perform dynamic, safe and thorough sterilization and purification treatment, and has the advantages of timeliness, convenience, safety and high efficiency.

Drawings

Fig. 1 is a schematic structural view of a dental negative pressure aerosol sterilizer.

Fig. 2 is a schematic view of fig. 1 with the host housing portion removed.

FIG. 3 is a schematic view of a balanced gimbal arrangement.

Fig. 4 is a cross-sectional view of fig. 4 of the balanced gimbal assembly.

Fig. 5 is a sectional view of the balanced gimbal assembly in another state.

Fig. 6 is a schematic view of a cam plate.

Fig. 7 is a cross-sectional view of the cam plate.

Figure 8 is a schematic view of an aerosol collection hood.

Fig. 9 is a schematic view of fig. 8 with the inner shroud and the water retention box removed.

Figure 10 is a cross-sectional view of an aerosol collection hood.

Fig. 11 is a partially enlarged view of fig. 10 at a.

Wherein:

main chassis 1

Main unit handle 2

Rear hose 3

Vertical supporting tube 4

Balance universal joint device 5, support plate 5.1, spring shaft 5.2, longitudinal rotation shaft 5.3, damping sheet 5.4, torsion spring 5.5, cam plate 5.6, mounting section 5.61, embedding section 5.62, adjusting section 5.63, cam section 5.64, cam upper section 5.641, cam lower section 5.642, inflection point 5.643, cam tightening section 5.644, vertical rotation shaft 5.7, fastening screw 5.8 and pressure regulating jackscrew 5.9

Hard arm tube 6

Front hose 7

Cover handle 8

The device comprises an aerosol collecting cover 9, an outer cover shell 9.1, a connecting pipe 9.11, a sealing ring groove 9.12, an inner cover plate 9.2, an outer edge air suction groove hole 9.21, an inner air suction hole 9.22, a limit baffle plate 9.23, a first magnet 9.24, a water accumulation box 9.3, an inner water accumulation groove 9.31, an outer water accumulation groove 9.32, a positioning partition plate 9.33, an inner baffle plate 9.34, an outer baffle plate 9.35, a second magnet 9.36, a positive and negative ion generator 9.4 and a drainage water retaining brim 9.5

Display screen 10

Caster 11

Lock sleeve 12

Along the lower guide tube 13

Ultraviolet lamp tube 14

Primary net 15

High efficiency strainer 16

Turbo fan 17

An electronic control box 18.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious 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. 1-11, the dental negative pressure aerosol sterilizer of the present invention comprises a main machine housing 1, a main machine handle 2 is arranged on the main machine housing 1, a vertical lower guide tube 13 is arranged at the upper section in the main machine housing 1, the top of the lower guide tube 13 is positioned on the top surface of the main machine housing 1, a locking sleeve 12 is arranged at the top of the lower guide tube 13, a vertical supporting tube 4 is arranged in the lower guide tube 13, the vertical supporting tube 4 can slide up and down along the lower guide tube 13 and can be locked by the locking sleeve 12, the top height of the vertical supporting tube 4 can be adjusted by adjusting the locking sleeve 12, a balance universal joint device 5 is arranged at the top of the vertical supporting tube 4, a hard arm tube 6 is arranged on the balance universal joint device 5, the rear end of the hard arm tube 6 is hermetically connected with a downward rear hose 3 through an elbow, the lower end of the rear hose 3 extends into the main machine housing 1 from the top of the main machine housing 1, the front end of the hard arm pipe 6 is hermetically connected with a front hose 7, the front end of the front hose 7 is connected with an aerosol collecting cover 9, and a cover handle 8 is arranged at the joint of the front hose 7 and the aerosol collecting cover 9; the side of host computer shell 1 is provided with display screen 10, the bottom of host computer shell 1 is provided with truckle 11, middle section in the host computer shell 1 is provided with from last ultraviolet tube 14, the just net 15 of imitating, high-efficient filter screen 16 and the turbofan 17 of arranging down in proper order, hypomere in the host computer shell 1 is provided with automatically controlled box 18.

The balance universal joint device 5 comprises a vertical rotating shaft 5.7 and a vertical rotating shaft 5.7, the balance universal joint device is vertically arranged in an upper end hole of the vertical supporting tube 4, the vertical rotating shaft 5.7 can rotate in the upper end hole of the vertical supporting tube 4, a longitudinal hole is formed in the upper end of the vertical rotating shaft 5.7, a longitudinal rotating shaft 5.3 is arranged in the longitudinal hole, a transverse support plate 5.1 is arranged above the vertical rotating shaft 5.7, the support plate 5.1 is rotatably connected with the vertical rotating shaft 5.7 through the longitudinal rotating shaft 5.3, a damping sheet 5.4 is sleeved on the longitudinal rotating shaft 5.3 between the vertical rotating shaft 5.7 and the support plate 5.1, a cam plate 5.6 is arranged on the right side of the vertical rotating shaft 5.7, the cam plate 5.6 comprises a vertical mounting section 5.61, a leftward embedding section 5.62 is arranged at the top of the mounting section 5.61, an adjusting section 5.63 is obliquely arranged on the lower side of the right lower end of the mounting section 5.61, a rightward protruding cam section 5.63 rightwards is arranged on the lower end of the adjusting section 5.64, the mounting section 5.61 of the cam plate 5.6 is fixed on the right side wall of the upper section of the vertical rotating shaft 5.7 through a leftward fastening screw 5.8, the right side wall of the upper section of the vertical rotating shaft 5.7 is provided with an embedding groove, the embedding section 5.62 of the cam plate 5.6 is embedded in the embedding groove, the cam section 5.64 comprises an upper cam section 5.641, a lower cam section 5.642, an inflection point 5.643 between the upper cam section 5.641 and the lower cam section 5.642, the lower part of the lower cam section 5.642 is connected with a top cam section 5.644, the convex surface of the upper cam section 5.641 faces obliquely upward, the convex surface of the lower cam section 5.642 faces obliquely downward, a rightward pressure regulating top wire 5.9 is arranged in the vertical rotating shaft 5.7 corresponding to the left side of the regulating section 5.63 of the cam plate 5.6, the right end of the pressure regulating top wire 5.9 penetrates through the left side wall of the regulating section 5.63 of the vertical rotating shaft 5.7, the bracket plate 5.1 is fixedly connected with the hard arm pipe 6, the front section (corresponding to the right arm pipe) of the hard arm 5.6) is provided with a front section 2, downward torsion springs 5.5 are connected to the spring shafts 5.2, the feet at the upper ends of the torsion springs 5.5 abut against the bottom surface of the support plate 5.1, the feet at the lower ends of the torsion springs 5.5 are provided with leftward arc-shaped convex blocks, and the arc-shaped convex blocks are in sliding contact with the cam plates 5.6 to play a role in adjusting balance pressure in the sliding process.

When the height of the front end of the hard arm pipe 6 needs to be adjusted downwards, the front section of the hard wall pipe 6 is directly pressed down, the foot at the lower end of the torsion spring 5.5 can slide on the upper cam section 5.641 of the cam plate 5.6, the torsion spring 5.5 can store certain pressure along with the continuous pressing of the front section of the hard wall pipe 6, the balance pressure can be adjusted through the torsion spring 5.5 in the process, when the front end of the hard arm pipe 6 is adjusted to be too low, namely the foot at the lower end of the torsion spring 5.5 passes through the inflection point 5.643 to reach the lower cam section 5.642, if the pressing-down process is continued, the foot at the lower end of the torsion spring 5.5 is matched with the lower cam section 5.642 and keeps the balance pressure, if the pressing-down pressure is suddenly cancelled, the foot at the lower end of the torsion spring 5.5 can be ensured not to instantaneously return to the upper cam section 5.641 due to the existence of the inflection point 5.643, and therefore, the whole process can keep certain balance. When the balanced gimbal device 5 is used for a long time. No matter the elasticity of the torsion spring 5.5 or the elasticity of the arc-shaped convex block or the elasticity of the cam plate 5.6 has certain loss, at the moment, the pressure regulating jackscrew 5.9 is ejected rightwards, so that the pressure regulating jackscrew 5.9 ejects the regulating section 5.63 rightwards by a small distance, and the distance between the cam section 5.64 and the arc-shaped convex block of the foot at the lower end of the torsion spring 5.5 is reduced, thereby compensating the loss of the elasticity.

The aerial fog collecting cover 9 comprises an outer cover shell 9.1, the outer cover shell 9.1 is provided with a horn opening which inclines downwards, the upper section of the opening of the outer cover shell 9.1 is provided with an inner cover plate 9.2, the inner cover plate 9.2 retracts for a distance relative to the outer edge of the opening of the outer cover shell 9.1, the back of the inner cover plate 9.2 is provided with a positive-negative ion generator 9.4, the rear end junction of the outer cover shell 9.1 is provided with a connecting pipe 9.11, the front end of the connecting pipe 9.11 is inserted into the outer cover shell 9.1, the rear end of the connecting pipe 9.11 extends to the rear part of the outer cover shell 9.1, the rear end of the connecting pipe 9.11 is provided with a sealing ring groove 9.12 backwards, the front end of a front hose 7 is inserted into the sealing ring groove 9.12, a cover handle 8 is fixed outside the connecting pipe 9.11, the inner wall of the outer cover shell 9.1 at the corresponding part below the front end of the connecting pipe 9.11 is provided with a drainage right eaves 9.5 which inclines upwards, the water baffle 9.2 is provided with an arc-shaped gap, the annular edge of the front outer edge of the inner cover plate 9.2 is provided with a plurality of outer edge air suction slotted holes 9.21 which are annularly arranged, the outer edge air suction slotted holes 9.21 are narrow groove-shaped holes which are arranged at intervals, the front outer edge bottom edge of the inner cover plate 9.2 is provided with a plurality of inner air suction holes 9.22 which are linearly arranged at intervals, the outer edge air suction slotted holes 9.21 and the inner air suction holes 9.22 enclose into a circle, the bottom edge of the inner cover plate 9.2 is downwards provided with a limit baffle 9.23, the front surface of the limit baffle 9.23 is provided with a first magnet 9.24, the lower section of the opening of the outer cover plate 9.1 is provided with a water accumulation box 9.3 which can be detachably connected, the bell mouth outer ring of the outer cover plate 9.1 is provided with a bearing platform, the lower end of the water accumulation box 9.3 is placed on the bottom bearing platform of the outer cover plate 9.1, the water accumulation box 9.3 is provided with two water accumulation grooves with upward openings, the two water accumulation grooves are respectively an inner water accumulation groove 9.31 and an outer water accumulation groove 9.32, the partition plate in the middle of the inner water accumulation groove 9.31 and the outer water accumulation groove is called as a positioning partition plate 33.32, the other baffle plate on the inner side of the inner water accumulation groove 9.31 is called an inner baffle plate 9.34, the other baffle plate on the outer side of the outer water accumulation groove 9.32 is called an outer baffle plate 9.35, the back surface of the positioning partition plate 9.33 is provided with a second magnet 9.36, when the water accumulation box 9.3 is installed on the outer housing 9.1, the water accumulation box corresponds to the arc-shaped gap, the positioning partition plate 9.33 is in magnetic fit with the limiting baffle plate 9.23, a seal is formed at the joint, the inner water accumulation groove 9.31 and the outer water accumulation groove 9.32 are respectively positioned on the inner side and the outer side of the inner housing 9.2, the inner baffle plate 9.34 is positioned below the drainage water retaining eave 9.5 and is attached to the inner wall of the outer housing 9.1, and the outer baffle plate 9.35 is positioned below the outer side of the inner housing 9.2.

Working principle;

1. in the course of the work, a dental negative pressure aerial fog sterilizing machine's turbofan 17 work, the during operation aerial fog is collected the cover and is produced great appeal to the air, inside ultraviolet ray disinfection room and the high-efficient net that purifies that excels in of machine is equipped with, and be equipped with the even air current layer of each circulation cross-section formation of multilayer homoflow net messenger gas, thereby make the complete machine reach best disinfection purifying effect, realize the purification performance that disinfects fast, make this machine reach the purpose that disposable disinfection purification rate is up to standard, therefore the biggest advantage of this machine is, aerial fog is collected the cover and is adopted the outer fringe slot hole structure of breathing in of the anterior outer fringe narrow groove type of inner shroud, thereby the inner shroud middle part does not establish the suction hole and makes the inspiratory flow of aerial fog collection cover outer fringe increase at double. The collecting effect of the aerial fog collecting cover is greatly improved. Meanwhile, the lower part of the aerosol collecting cover is provided with an inner and an outer water accumulating grooves. Can effectively receive and store the aerial fog, the spray condensate water and the like generated by the inner wall and the outer wall of the aerial fog collection cover. Meanwhile, the water accumulation box is provided with an inner water accumulation groove and an outer water accumulation groove. A positioning partition board is arranged between the inner water collecting tank and the outer water collecting tank. Aiming at the gas exhaled by a dental patient and aerosol generated during treatment in clinic and the like, and the gas is collected.

In the process of rescuing respiratory tract infectious patients, when the gas exhaled by the patients and the aerosol infection environment are severe, the aerosol collecting cover with strong negative pressure and large suction can timely absorb the bacteria-carrying gas in a certain distance, and the secondary pollution is avoided by once sterilizing the aerosol collecting cover with multiple composite powerful sterilizing devices in the machine to reach the standard, thereby greatly reducing the cross infection probability of clinical medical staff and providing safe and reliable environmental space for the medical staff and the patients.

2. The traditional dental treatment chair telescopic swing arm adopts a compression spring balance mechanism in the wall to control the parking position of the swing arm, but the space in the wall almost occupies the space without circulating airflow. The telescopic swing arm of the machine adopts an original pipe-arm integrated structure, utilizes a balance universal joint device, and has compact structure, portability and no influence on the space in a pipe. The torsion of the torsion spring is used for supporting the hard arm tube to achieve a state of not falling. While achieving balance within each working angle. Is provided with a fixed pressure regulating cam plate mechanism. Along with the up-and-down swing of the hard arm pipe. A leg of the spring slides on the cam plate surface. The compression amount of the torsion spring is adjusted along with the concave-convex fluctuation of the cam plate surface. Thereby achieving balance of the torsional forces. Meanwhile, a rotating shaft of the hard arm pipe is provided with a concentric damping friction plate capable of adjusting pressure, so that the up-and-down swinging electrodeless positioning of the hard arm pipe is effectively realized.

3. The traditional pipe-arm integrated structure. One is composed of multiple hard arm tubes and multiple unidirectional rotary joints. The other is formed by connecting a plurality of hollow universal joints in series. The above conventional structure. In order to solve the problem of sealing and swinging support balance. The connection of each movable joint is very tight, the swinging resistance is very large, and the movement is very inconvenient. The product adopts soft and hard tube connection and combines a torsional spring type universal joint composite structure. The structure is compact and the sealing performance is good. Flexible and convenient to use.

4. The universal joint assembly is removed from the whole machine, the hard arm tube dental treatment chair illumination lamp arm is bound, and the lamp arm can work synchronously by means of supporting and positioning of the illumination lamp arm.

5. The invention can be used in a plurality of states:

the first state: the whole machine works independently.

And a second state: the balance universal joint device is removed from the whole machine, the hard arm pipe is bound with the lighting lamp arm of the dental treatment chair, and the dental treatment chair can synchronously work by means of supporting and positioning of the lighting lamp arm.

And a third state: the hard arm tube is bound with the lighting lamp arm of the dental treatment chair and supports and positions the synchronous work by the lighting lamp arm. The back hose can be removed, and the mainframe box is directly connected with the negative pressure air suction disinfection interface of the dental treatment chair.

The above are only specific application examples of the present invention, and do not limit the scope of the present invention in any way. The technical solutions formed by using equivalent transformation or equivalent substitution are all within the protection scope of the present invention.

Claims

1. The utility model provides a dentistry negative pressure aerial fog sterilizing machine, its characterized in that includes host computer shell (1), be provided with host computer handle (2) on host computer shell (1), upper segment in host computer shell (1) is provided with vertical lower stand pipe (13), and the top of lower stand pipe (13) is located host computer shell (1) top surface, and the top of lower stand pipe (13) is provided with lock sleeve (12), is equipped with upright stay tube (4) in lower stand pipe (13) to the inside, and upright stay tube (4) can be followed down stand pipe (13) and slided from top to bottom and can be locked through lock sleeve (12), upright stay tube (4) top is provided with balanced universal joint device (5), be provided with hard arm pipe (6) on balanced universal joint device (5), the rear end of hard arm pipe (6) is through an elbow sealing connection decurrent back hose (3), the lower extreme of back hose (3) stretches into in host computer shell (1) from the top of host computer shell (1), the front end of the hard arm pipe (6) is hermetically connected with a front hose (7), the front end of the front hose (7) is connected with an aerosol collecting cover (9), and a cover handle (8) is arranged at the joint of the front hose (7) and the aerosol collecting cover (9); the bottom of the main case (1) is provided with casters (11), and the middle section in the main case (1) is provided with an ultraviolet lamp tube (14), an initial net (15), a high-efficiency filter screen (16) and a turbofan (17) which are sequentially arranged from top to bottom;

the balance universal joint device (5) comprises a vertical rotating shaft (5.7) and a vertical rotating shaft (5.7), the vertical rotating shaft (5.7) is vertically installed in an upper end hole of a vertical supporting pipe (4), the vertical rotating shaft (5.7) can rotate in the upper end hole of the vertical supporting pipe (4), a longitudinal hole is formed in the upper end of the vertical rotating shaft (5.7), the longitudinal rotating shaft (5.3) is installed in the longitudinal hole, a transverse support plate (5.1) is arranged above the vertical rotating shaft (5.7), the support plate (5.1) is rotatably connected with the vertical rotating shaft (5.7) through the longitudinal rotating shaft (5.3), a cam plate (5.6) is arranged on the right side of the vertical rotating shaft (5.7), the cam plate (5.6) comprises a vertical installation section (5.61), a leftward embedded section (5.62) is arranged at the top of the installation section (5.61), an adjusting section (5.63) is obliquely arranged at the lower end of the installation section (5.61) towards the right lower side, a rightward convex cam section (5.64) is arranged at the lower end of the right side, the lower end of the cam section (5.64) is abutted against the right side wall of the vertical rotating shaft (5.7) leftwards, the mounting section (5.61) of the cam plate (5.6) is fixed on the upper right side wall of the vertical rotating shaft (5.7) through a leftward fastening screw (5.8), the upper right side wall of the vertical rotating shaft (5.7) is provided with an embedding groove, the embedding section (5.62) of the cam plate (5.6) is embedded in the embedding groove, the support plate (5.1) is fixedly connected with the hard arm pipe (6), the right section of the support plate (5.1) is provided with a longitudinal spring shaft (5.2), the spring shaft (5.2) is provided with a downward torsion spring (5.5) and abuts against the bottom surface of the foot support plate (5.1) at the upper end of the torsion spring (5.5), the foot at the lower end of the torsion spring (5.5) is provided with a leftward arc-shaped bump, and the arc-shaped bump is in sliding contact with the cam plate (5.6);

a damping fin (5.4) is sleeved on the longitudinal rotating shaft (5.3) between the vertical rotating shaft (5.7) and the support plate (5.1);

a pressure regulating jackscrew (5.9) from left to right is arranged in the vertical rotating shaft (5.7) corresponding to the left of the regulating section (5.63) of the cam plate (5.6), and the right end of the pressure regulating jackscrew (5.9) penetrates through the vertical rotating shaft (5.7) to abut against the left side wall of the regulating section (5.63).

2. The dental negative-pressure aerosol sterilizer as claimed in claim 1, wherein the cam section (5.64) comprises an upper cam section (5.641), a lower cam section (5.642) and an inflection point (5.643) between the upper cam section (5.641) and the lower cam section (5.642), the lower cam section (5.642) is connected with a cam jacking section (5.644), the convex surface of the upper cam section (5.641) faces obliquely upward, and the convex surface of the lower cam section (5.642) faces obliquely downward.

3. The dental negative-pressure aerosol sterilizer of claim 1, wherein the aerosol collecting hood (9) comprises an outer hood (9.1), the outer hood (9.1) has a horn opening inclined downward, an inner hood (9.2) is provided at an upper middle section of the opening of the outer hood (9.1), the inner hood (9.2) is retracted a distance from an outer edge of the opening of the outer hood (9.1), a positive and negative ion generator (9.4) is provided at a back surface of the inner hood (9.2), a connecting pipe (9.11) is provided at a rear end connection of the outer hood (9.1), a front end of the connecting pipe (9.11) is inserted into the outer hood (9.1), a rear end of the connecting pipe (9.11) extends to a rear side of the outer hood (9.1), an inner wall of the outer hood (9.1) corresponding to a lower side of the front end of the connecting pipe (9.11) is provided with a drainage eaves (9.5) inclined upward, and a water baffle (9.2) has an arc-shaped notch at a bottom, a plurality of outer edge air suction slotted holes (9.21) which are annularly arranged are arranged on the annular edge of the front outer edge of the inner cover plate (9.2), a plurality of inner suction holes (9.22) which are linearly arranged at intervals are arranged at the bottom edge of the front outer edge of the inner cover plate (9.2), a periphery is formed by the outer edge suction slot hole (9.21) and the inner suction holes (9.22), a limit baffle plate (9.23) is arranged downwards at the bottom edge of the inner cover plate (9.2), a water accumulation box (9.3) which is detachably connected is arranged at the lower section of the opening of the outer cover shell (9.1), the water accumulation box (9.3) is provided with two water accumulation grooves with upward openings, the two water accumulation grooves are respectively an inner water accumulation groove (9.31) and an outer water accumulation groove (9.32), the partition plate between the inner water collecting tank (9.31) and the outer water collecting tank (9.32) is called a positioning partition plate (9.33), the other baffle plate on the inner side of the inner water collecting tank (9.31) is called an inner baffle plate (9.34), and the other baffle plate on the outer side of the outer water collecting tank (9.32) is called an outer baffle plate (9.35).

4. A dental negative-pressure aerosol sterilizer as claimed in claim 3, wherein the rear end of the connecting tube (9.11) is provided with a sealing ring groove (9.12) at the rear, and the front end of the front hose (7) is inserted into the sealing ring groove (9.12).

5. A dental negative-pressure aerosol sterilizer as claimed in claim 3, wherein the outer peripheral suction slot holes (9.21) are narrow slot-type holes arranged at intervals.

6. A dental negative-pressure aerosol sterilizer as claimed in claim 3, wherein the front surface of the limit baffle (9.23) is provided with a first magnet (9.24), and the back surface of the positioning partition plate (9.33) is provided with a second magnet (9.36).

7. A dental negative-pressure aerosol sterilizer as claimed in claim 3, wherein the bell-mouthed outer ring of the outer housing (9.1) has a platform, and the lower end of the water-collecting box (9.3) rests on the bottom platform of the outer housing (9.1).