CN110882071A

CN110882071A - Nozzle assembly of pneumatic dental sand blasting device

Info

Publication number: CN110882071A
Application number: CN201811056773.6A
Authority: CN
Inventors: 刘伟; 刘军
Original assignee: SIFANG MEDICAL INSTRUMENTS CO Ltd HANGZHOU
Current assignee: SIFANG MEDICAL INSTRUMENTS CO Ltd HANGZHOU
Priority date: 2018-09-11
Filing date: 2018-09-11
Publication date: 2020-03-17

Abstract

The invention aims to provide a nozzle assembly of a pneumatic dental sand blasting device and a processing method thereof, wherein the processing cost is reduced. A nozzle component of a pneumatic dental sand blasting device comprises a shell, a gas pipeline, a water pipeline and a nozzle, wherein the gas pipeline and the water pipeline are respectively fixed with the nozzle; one end of the shell is connected with the nozzle, and the other end of the shell is a joint part; the shell is provided with a water inlet of a water pipeline; the shell comprises an outer shell and an inner frame, and the inner frame is arranged in the outer shell; the joint part is arranged at one end of the inner frame, the gas pipeline penetrates through the other end of the inner frame and is locked, and the combination of the gas pipeline and the inner frame locks the nozzle, the shell and the inner frame.

Description

Nozzle assembly of pneumatic dental sand blasting device

Technical Field

The invention relates to the field of dental medical instruments, in particular to a nozzle assembly of a pneumatic dental sand blasting device.

Background

Tooth cleaning is a good tooth health care means and is also the primary measure for treating periodontal disease. The regular tooth cleaning can not only thoroughly remove dental plaque and calculus on teeth, keep the periodontal tissue healthy and prevent and treat periodontal diseases. In addition, when teeth are cleaned, small and inconspicuous odontopathy such as hidden decayed teeth can be easily found, and the aim of early detection and early treatment can be achieved.

The sand blasting tooth cleaning is to clean tea dirt, smoke dirt and substance soft dirt attached to teeth by adding high-pressure water to pearl salt, and the teeth cleaned by sand blasting are very smooth and are not easy to deposit dental calculus again, so that the tooth cleaning and the sand blasting are generally recommended to be carried out in a combined manner.

The pneumatic dental sand blasting device performs tooth treatment through a jet of abrasive powder mixed with air and water, and comprises a machine body assembly and a nozzle assembly, wherein the machine body assembly is connected with the nozzle assembly in a plug-in mode;

the machine body assembly comprises an integrated powder container (also called sand chamber) for storing a predetermined amount of powder, an air supply line for pressurizing air and connected to the inside of the powder container, a delivery line for delivering the powder mixed with air, a water supply line connected to a water source, and a machine body joint connected to a nozzle; one end of the conveying line is connected into the powder container, and the other end of the conveying line is exposed out of the machine body joint; a water outlet of a water supply line is formed in the joint part of the machine body, two sealing rings are axially arranged on the joint of the machine body, and the water outlet is arranged between the two sealing rings;

the nozzle assembly comprises a nozzle housing, a nozzle, a water output line and an air powder output line, the nozzle is provided with a water channel and an air powder channel, and the air powder channel is arranged in the water channel; the nozzle is provided with a water inlet of a water output line and a gas inlet of an air powder output line, and the nozzle shell is hermetically connected with the machine body joint; when the head assembly and the nozzle assembly are connected, the conveying line is connected with the air powder output line.

When the sand blasting machine is used, the machine body assembly and the nozzle assembly are inserted in place, and a water containing gap is formed in the area in front of the two sealing rings; pressurized air and water are input, air powder is sprayed out of the air powder channel through the conveying line and the air powder output line, and water is sprayed out of the water channel through the water supply line, the water containing gap and the water output line.

The prior sand blasting machine has the following defects: 1. the machine body joint and the part connected with the machine body joint in the nozzle shell are made of metal materials, the manufacturing cost is high, and after the machine body joint and the nozzle shell are pulled out and inserted for many times, abrasion occurs between the metals, so that the connection between the machine body assembly and the nozzle assembly is loosened. 2. After the transmission line and the air powder output line are pulled out and inserted for many times, the connection tightness is reduced, and sand leakage and sand blockage are easy to occur. 3. The water channel is annular, and rivers are the annular scattering, and the jet force is less.

Disclosure of Invention

The invention aims to provide a nozzle assembly of a pneumatic dental sand blasting device and a processing method thereof, wherein the processing cost is reduced.

A nozzle component of a pneumatic dental sand blasting device comprises a shell, a gas pipeline, a water pipeline and a nozzle, wherein the gas pipeline and the water pipeline are respectively fixed with the nozzle; one end of the shell is connected with the nozzle, and the other end of the shell is a joint part; the shell is provided with a water inlet of a water pipeline.

The joint part connects the nozzle assembly with the machine body assembly in a sealing manner to form a working sand blasting machine. After the nozzle assembly is connected with the machine body assembly, a water pipeline water spray nozzle of the machine body assembly is connected with a water pipeline water inlet of the nozzle assembly through a sealed containing cavity or space, so that water flow is conveyed from the machine body assembly to the nozzle assembly and then is sprayed out from the nozzle. After the nozzle assembly and the machine body assembly are connected in a sealing mode, the gas pipeline of the machine body assembly is connected with the gas pipeline of the nozzle assembly in a sealing mode, and the powder-air mixture is conveyed to the nozzle assembly from the machine body assembly and then sprayed out from the nozzle. The air nozzle in the nozzle has an inner air nozzle and a water outlet outside the air nozzle.

Shell body

Preferably, the housing and the nozzle are removably engaged, the gas conduit has a threaded portion, the housing has a baffle through which the gas conduit passes and is locked, and the combination of the gas conduit and the housing locks the nozzle and the housing.

As a preferable scheme: the shell comprises an outer shell and an inner frame, and the inner frame is arranged in the outer shell; one end of the inner frame is a joint part, the other end of the inner frame is a baffle plate, the gas pipeline penetrates through the other end of the inner frame and is locked, and the combination of the gas pipeline and the inner frame locks the nozzle, the shell and the inner frame. The gas pipeline of the nozzle assembly penetrates through the connecting end of the inner frame and is communicated with the gas pipeline of the machine body assembly. The outer shell, the inner frame and the nozzle are three independent parts, and the inner frame, the outer shell and the nozzle are combined together while being locked between the gas pipeline and the inner frame.

Preferably, the inner frame includes a barrel, a joint part is provided at a first end of the barrel, and a baffle plate having a through hole for allowing the gas pipe to pass therethrough is provided at a second end opposite to the first end.

Preferably, the inner frame is provided with a locking piece, and the locking piece is tightly matched with the gas pipeline. Preferably, the locking member and the gas pipe are locked by a slope, a key fit, etc.

Preferably, the nozzle assembly is provided with a locking member, the locking member abuts against the baffle plate of the inner frame, and the locking member is fixedly connected with the gas pipeline through a thread pair or is tightly matched with the gas pipeline; the gas conduit has a connecting end exposed from the retaining member. The retaining member is a separate component from the inner frame, and during assembly, the gas conduit is connected to the retaining member and the gas conduit after passing through the retaining plate of the inner frame, and when the retaining member abuts against the inner frame, the retaining member is connected to the gas conduit. Preferably, the locking member is a nut, and the gas pipeline is provided with a threaded section. The nut is engaged with the threaded section. Inner tower and gas pipeline are locked with the retaining member to combine nozzle, shell and inner tower into nozzle assembly, nozzle assembly during the equipment as long as loosen the retaining member can realize the dismantlement to nozzle assembly, be convenient for maintenance and change part.

As preferred scheme, the water inlet of water pipeline is located interior frame, has the sealing washer between interior frame and the water pipeline. The water pipeline is bent to avoid the inner frame, one part of the water pipeline is positioned between the inner frame and the shell, and the sealing ring not only prevents water from entering the area between the inner frame and the shell, but also plays a role in positioning the water pipeline and fixes one end of a water inlet of the water pipeline. Preferably, the stack shell of interior frame has the portion of holding that holds the water pipeling, and the portion of holding is the breach of seting up on the stack shell surface, or the portion of holding is the hole of seting up on the stack shell, and the portion of holding communicates with the water inlet. The containing part plays a limiting role in the water pipeline, and the water inlet end of the water pipeline is fixed by the sealing ring.

As the preferred scheme, the outer surface of the inner frame is provided with a first step, and the inner surface of the outer shell is provided with a second step matched with the first step; the second step is adjacent to the nozzle relative to the first step. The first step moves the housing against the second step in a direction closer to the nozzle as the locking member engages the gas conduit. Preferably, the first step and the second step are both annular steps.

Preferably, a positioning rib plate is arranged in the shell and is in contact with the inner frame, and the positioning rib plate is spaced from the first step. When the combination of the inner frame, the shell and the nozzle is completed, the positioning rib plates and the inner frame are mutually squeezed tightly, so that the inner frame, the gas pipeline and the water pipeline are prevented from shaking. Preferably, the number of the positioning rib plates is multiple, and the plurality of the positioning rib plates are uniformly arranged along the periphery of the inner frame. Preferably, the barrel body of the inner frame is cylindrical, and the contact surface of the positioning rib plate and the inner frame is arc-shaped. Thereby increasing the contact area of the inner frame and the positioning rib plate and improving the positioning stability of the inner frame.

Preferably, the housing and the nozzle are each a separate removable component. Therefore, the shell, the inner frame and the nozzle are independent parts respectively and can be replaced respectively, the parts can be maintained and replaced conveniently, the parts can be manufactured respectively, the structure of a single part is simplified, and the manufacturing cost is reduced.

Preferably, one end of the shell is abutted against the nozzle, and a limiting part for preventing the shell and the nozzle from rotating mutually is arranged between the combining surfaces of the shell and the nozzle. Therefore, after the shell is combined with the nozzle, the shell and the nozzle do not rotate and move, and the stability of the nozzle assembly is kept.

In another preferred embodiment, the housing and the nozzle are fixedly connected, or the housing and the nozzle are integrated. The shell and the nozzle are fixed or integrated, the assembling process is simplified, and the reliability of the connection of the shell and the nozzle is high.

Clamp spring

When the nozzle assembly is combined with the machine body assembly, a C-shaped clamp spring is arranged between the nozzle assembly and the machine body assembly, and the clamping connection of the nozzle assembly and the machine body assembly is realized by utilizing the deformation of the clamp spring.

As the preferred scheme, a C-shaped clamp spring is arranged between the nozzle assembly and the machine body assembly, and two ends of the clamp spring are passivated. If the end is spherical, cambered or chamfered, the end is passivated.

Preferably, the snap spring is mounted at the joint part of the inner frame. The body assembly is provided with a clamp spring groove matched with the clamp spring.

Preferably, each end of the clamp spring is respectively an inclined surface, and the inclined surfaces face the machine body assembly. The inclined plane faces the machine body assembly, and the inclined plane and the inner ring of the clamp spring form an obtuse angle. The inner ring has a small diameter and the outer ring has a large diameter. The inclined plane reduces the wearing and tearing between jump ring and the organism subassembly.

Preferably, the edge of the bevel is a smooth curved surface. When smooth curved surfaces such as bulb, cambered surface are arranged at the two ends of the clamp spring, no cutting is carried out between the clamp spring and the machine body assembly, so that the clamp spring and the machine body assembly can be prevented from being worn mutually when the nozzle assembly is connected with the machine body assembly in a plug-in mode.

Nozzle with a nozzle body

The water and air mixture is sprayed from a nozzle, which is connected to the water and gas conduits, respectively, and which is fixed to the housing.

Preferably, the nozzle comprises a body and a nozzle pipe, the nozzle is respectively connected with the water pipeline and the gas pipeline, the nozzle is provided with a water spraying channel and a gas spraying channel, the gas spraying channel is arranged inside the gas spraying channel, and the water spraying channel is arranged outside the gas spraying channel; the body is tightly matched with the nozzle pipe, a water spraying channel is arranged in the nozzle pipe, a water inlet part and a water guide part are arranged between the nozzle pipe and the body, and the water inlet part is communicated with the water guide part to form the water spraying channel. The areas of the nozzle pipe except the water inlet and spray channel are attached to the body, water can be sprayed out from the outlet of the water spray channel, fixed-point and uniform water outlet is achieved, and the force of spraying water outwards is improved.

Preferably, the water guide part has a plurality of water guide parts, the outlet of the water guide part is used as the outlet of the water spraying channel, and the outlets of the water guide parts are uniformly distributed around the air spraying channel.

Preferably, the body of the nozzle has a water pipe connection passage and a gas pipe connection passage, the water pipe connection passage is fixed with the water pipe, and the gas pipe connection passage is fixed with the gas pipe.

Preferably, the body of the nozzle is provided with a nozzle pipe mounting hole, the nozzle pipe is inserted into the nozzle pipe mounting hole, and the nozzle pipe is tightly matched with the body.

Preferably, the body of the nozzle is formed by MIM injection molding, and the water pipe connecting passage, the air pipe connecting passage and the steel pipe accommodating cavity are formed during injection molding. Accomplish the MIM of body and mould plastics the back, reuse laser welding links to each other water pipeling and water piping connection passageway, links to each other gas pipeline and trachea connecting channel with laser welding, and the steel pipe that impresses nozzle pipe holds the intracavity, nozzle pipe and body interference fit.

In other embodiments, the nozzle has a connector having an air pipe interface, a water pipe interface, and a nozzle pipe interface, the air pipe interface and the water pipe interface are respectively communicated with the nozzle pipe interface, and the connection portion of the air pipe interface and the nozzle pipe interface is staggered with the connection portion of the water pipe interface and the nozzle pipe interface.

When the nozzle is manufactured, the nozzle pipe is fixed in the nozzle pipe connector, an air inlet and a water inlet part are arranged between the nozzle pipe and the nozzle pipe connector, the air inlet is communicated with the air pipe connector and the air injection channel, and the water inlet part is communicated with the water pipe connector and the water injection channel. The connecting piece accomplishes the back with water pipeling, gas pipeline, nozzle union coupling, carries out the moulding plastics of nozzle body, and the nozzle pipe all laminates with the body except that the region of advancing the water spray passageway, and water can only be outwards spout from the water spray passageway, realizes fixed point, even play water, improves the outside strength that sprays of water.

In other embodiments, the gas pipeline, the water pipeline and the nozzle pipe are wrapped on the body of the nozzle, the gas pipeline is provided with a mounting hole, the nozzle pipe is inserted into the mounting hole, and the gas pipeline is communicated with the gas injection channel; the water pipeline is provided with a water spraying opening penetrating through the water pipeline, and the nozzle pipe penetrates through the water spraying opening and the water spraying opening is aligned to the water inlet part.

When the nozzle is manufactured, the nozzle pipe penetrates through a water spray nozzle of a water pipeline and then is inserted into a mounting hole of a gas pipeline, then the nozzle is subjected to injection molding, areas of the nozzle pipe except a water inlet and outlet channel are attached to the body, water can be sprayed out from the water inlet and outlet channel, fixed-point and uniform water outlet is achieved, and the force of water spraying out is improved.

Preferably, the nozzle has an extension connected to the housing, the extension and the nozzle forming a positioning step therebetween. As long as the size change appears between the nozzle and the extension section, a positioning step can appear. When the shell is pressed against the positioning step, the shell is combined with the nozzle in place.

Preferably, the limiting member is disposed between the extending section and the housing, the extending section is inserted into the housing, the limiting member is a protrusion and a groove that are matched with each other, the protrusion is located on the extending section, the groove is located on the housing, or the protrusion is located on the housing, and the groove is located on the extending section. When the projection is inserted into the groove, the rotational freedom of the nozzle and the housing is unified.

Preferably, the protrusion is a rectangular block, and the groove is a rectangular groove.

Preferably, the limiting members are multiple, and the multiple limiting members are uniformly distributed between the housing and the extension section.

Nozzle pipe

The mixture of powder and air is ejected from the inner cavity of the nozzle tube and the water flow is ejected between the nozzle tube and the nozzle.

As a preferred scheme, the nozzle pipe is in a hollow cylindrical shape, the nozzle pipe is provided with an air inlet hole, a water inlet part and a water guide part, the air inlet hole is communicated with the inner cavity of the nozzle pipe, the water inlet part and the water guide part are isolated from the inner cavity of the nozzle pipe, and the water inlet part is positioned between the water pipeline and the water guide part; the outlet of the inner cavity of the nozzle pipe is used as an air nozzle of the nozzle, and the outlet of the water guide part is used as a water spraying port of the nozzle. After the nozzle pipe is matched with the body of the nozzle, the water inlet part and the water guide part are matched with the body of the nozzle to form a water spraying channel, and the water inlet part is used as an inlet of the water spraying channel.

The water inlet part divides the pipe body into an air pipe connecting section and a water guide section, the air inlet hole is positioned in the air pipe connecting section, and the water guide part is positioned in the water guide section.

Preferably, the water guide part is arranged along the axial direction of the nozzle pipe, the water guide part is provided with a plurality of water guide parts, and the plurality of water guide parts are uniformly distributed along the circumference of the nozzle pipe. The part of the water guide section except the water guide part is contacted with the nozzle, and water flow is intensively sprayed out from the water guide part, so that the water flow spraying force is improved, and the water flow is uniformly sprayed out at fixed points.

Preferably, the water guide part is a groove opened on the surface of the nozzle pipe. The cross section of the water guide part is rectangular, semicircular, arc-shaped, V-shaped, U-shaped, L-shaped, trapezoidal and the like.

Or the water guide part is positioned on the water guide section, the water guide section is prismatic, the side surface of the water guide section is used as the water guide part, and the water guide section is internally connected with the excircle of the nozzle pipe. Preferably, the water conducting section is a regular prism. Preferably, the edges of the water guide section are rounded. The prismatic water diversion section is convenient to process, the single-point water yield is stable, and the water yield is high. Preferably, the nozzle pipe is a cylinder with equal outer diameter, and the water inlet part is a circle of concave ring opened on the outer surface of the nozzle pipe. Preferably, the end of the water diversion section is provided with an extension section, the extension section is in a cylindrical ring shape, and the extension section is smaller than the pipe body. Therefore, an annular gap is formed between the extension section and the nozzle, and water flows out through the fixed point of the water guide part and then is converged into a ring at the extension section. When the nozzle is used, the water flow of all the diversion trenches is converged into a beam and then is sprayed out. The length of the extension section does not consume the strength of water flow jet, and the water flow can be converged into a bundle to be jetted.

Preferably, the body of the nozzle pipe is in interference fit with the steel pipe connecting channel of the connecting piece, the air pipe connecting section and the water inlet part are positioned in the connecting piece, and part of the water guide section is exposed out of the connecting piece.

Gas pipeline

The gas pipeline of the nozzle assembly is connected with the gas pipeline of the machine body assembly to form a conveying line for conveying the powder-air mixture.

Preferably, gas conduit one end is fixed with the nozzle, and the other end is the linkage segment that is used for linking to each other with the organism subassembly, has the locking portion with the casing fastening on the gas conduit, and locking portion is adjacent with the linkage segment.

Preferably, the locking portion is externally threaded. The nut is arranged in the shell and engaged with the locking part to achieve the purpose of locking the gas pipeline and the shell.

Preferably, the gas pipeline comprises a pipe body and a connector, the connector is fixed with the pipe body, and the locking part and the connecting section are arranged on the connector. The gas pipeline is formed by combining the connector and the pipe body, the pipe body can still adopt the existing gas pipeline, and only the locking part (such as external threads) needs to be processed on the connector, so that the manufacturing cost is reduced.

Preferably, the locking portion of the connecting head is enlarged relative to the connecting section. Thus, a limit step can be formed between the connecting section and the locking section. The limit step may be an inclined surface. When the connecting section is matched with the machine body assembly, the connecting section is locked at the position of the limiting step through the inclined plane.

Anti-blocking sand blasting machine

The sand blasting machine comprises a machine body assembly and a nozzle assembly, wherein the nozzle assembly and the machine body assembly are respectively provided with respective gas pipelines, a sealing cylinder is arranged between the gas pipeline of the nozzle assembly and the gas pipeline of the machine body assembly and is respectively in sealing connection with the two gas pipelines, and the common connection mode of the machine body assembly and the nozzle assembly with a gap between the two gas pipelines is plug-in connection.

The gas pipeline of the nozzle assembly is connected with the sealing barrel in a sealing mode, the gas pipeline of the engine body assembly is also connected with the sealing barrel, and the sealing barrel serves as a middle cavity to be communicated with the two gas pipelines. The sealing cylinder is of a pipe type with openings at two ends, and connecting parts which are in sealing fit with the two gas pipelines are respectively arranged at two ends of the sealing cylinder. Preferably, a transition cavity is arranged between the gas pipeline of the nozzle assembly and the gas pipeline of the machine body assembly, and the transition cavity is an inner cavity of the sealing cylinder. The export of transition chamber links up with the gas piping of nozzle assembly, and the entry of transition chamber links up with the gas piping of organism subassembly. The connection means that when the air flow enters the transition cavity from the air pipeline of the body assembly, the transition cavity has no obstruction to the air flow, and when the air flow enters the air pipeline of the nozzle assembly from the transition cavity, the air pipeline of the nozzle assembly blocks the air flow object.

As a preferred scheme, two ends of the sealing cylinder are respectively provided with connecting parts which are in sealing fit with the two gas pipelines, wherein one connecting part is a fixed end connecting part, the other connecting part is an inserting end connecting part, the fixed end connecting part is provided with a groove, and the gas pipeline connected with the fixed end connecting part is provided with a bulge which can be embedded into the groove; the connection part of the inserting end is a cavity which is tightly matched with another gas pipeline.

Preferably, the outer end part of the connection part of the plug end is provided with a guide inclined plane.

Preferably, the sealing cylinder is a tube body made of wear-resistant elastic materials such as a silicone tube, a latex tube or a rubber tube.

Preferably, the fixed end connecting part is connected with a gas pipeline of the machine body assembly, and the machine body assembly is provided with a protective shell for wrapping the sealing cylinder in the machine body assembly; the plug end connecting part is connected with a gas pipeline of the nozzle assembly. The protective shell and the gas pipeline clamp the sealing cylinder between the protective shell and the gas pipeline, so that the sealing cylinder has the existing flexibility in a plug-in type with the gas pipeline of the nozzle assembly to realize sealing connection, and has the rigidity to avoid the connection failure caused by the deformation of the sealing cylinder.

Preferably, the connection part of the insertion end is provided with a guide inclined plane. The guide inclined plane is matched with the limit step, and when the gas pipeline is inserted in place, the limit step is close to the guide inclined plane. The contact area of the two inclined surfaces is increased, and the reliability of sealing is improved.

Or the fixed end connecting part is connected with the gas pipeline of the nozzle assembly, and the inserting end connecting part is connected with the gas pipeline of the machine body assembly.

Sand blasting machine

In the using process of the sand blasting machine, the nozzle assembly and the machine body assembly need to be capable of freely and relatively rotating, so that the joint part of the nozzle assembly and the joint part of the machine body assembly need to meet the concentricity requirement after assembly, and the smooth degree of rotation can be ensured.

The pneumatic dental sandblasting machine comprises a nozzle assembly and a machine body assembly, wherein the machine body assembly is provided with a step, and a matching surface matched with the step is arranged on the nozzle assembly; the step or step surface is a plastic piece.

Preferably, the number of the steps is multiple, and the steps are concentric; each step corresponds to one mating surface. Preferably, there are two steps. The two concentric steps support the matching of the nozzle assembly and the machine body assembly, the circle center connecting line of the two steps is used as an axis, and the nozzle assembly and/or the machine body assembly rotate around the axis. Thereby guarantee in the course of the work, the sand cavity of organism subassembly is up all the time, and the air powder mixture can be carried smoothly.

Preferably, a sealing ring for sealing water flow is arranged on the machine body assembly and is positioned between the two concentric steps. That is, the two concentric steps have a certain span, increasing the concentric mating area of the body assembly and the nozzle assembly.

Preferably, the step is a tapered step and the mating surface is a ramp.

Preferably, the matching surface of the nozzle assembly is arranged at the joint part of the nozzle assembly, the step of the machine body assembly is arranged at the joint part of the machine body assembly, the joint part of the nozzle assembly is a plastic part, and the joint part of the machine body assembly is an integrally formed metal part. The joint part of the nozzle assembly is positioned on the inner frame, the inner frame is independent from the shell, and the inner frame can be made of plastic, so that the joint part is made of plastic. At this time, the joint portion of the body assembly only needs to be integrally formed with two concentric steps. The mode of two concentric steps is formed integrally, the direct concentricity of the two steps is reliable, and the processing is convenient.

Or the matching surface of the nozzle assembly is a metal piece, and the step of the machine body assembly is a plastic piece. Preferably, the body assembly comprises a metal fitting body and plastic collars, each plastic collar forming a step, the plastic collars being secured to the fitting body. The plastic lantern ring is fixed on the joint body in the modes of interference fit, bonding, thermoplastic or injection molding and the like.

When the joint part of the nozzle assembly and the joint part of the machine body assembly are both metal pieces, in order to avoid the metal surface from being directly contacted to generate severe abrasion, two plastic lantern rings are arranged on the joint part of the machine body assembly, the plastic lantern rings are contacted with the joint part of the nozzle assembly, and a gap is reserved between the area of the joint part of the machine body assembly except the plastic lantern rings and the joint part of the nozzle assembly. Therefore, the concentricity of the two metal surfaces is prevented from being increased due to direct abrasion.

Sand cavity of sand blasting machine

As the preferred scheme, the sand cavity of the sand blasting machine is internally provided with a marking line with the maximum powder adding amount. The maximum add power marker line may indicate the maximum amount of powder that the customer has when adding.

As the preferred scheme, a pressurized air conveying pipe and a gas pipeline are arranged in the sand cavity, the pressurized air conveying pipe 14 is provided with an air outlet, and the gas pipeline is provided with an air powder inlet; the marker line is lower than the air outlet hole and the air powder inlet. The phenomenon that powder (sand powder) enters the pressurized air conveying pipeline 14 and the gas pipeline due to too much powder adding of a client is avoided, and sand blockage is caused.

Preferably, the inner surface of the sand chamber is spherical.

Preferably, the body assembly of the sand blasting machine is provided with a mounting part of a sand cavity, the sand cavity is embedded into and fixed on the mounting part, and the sand cavity is provided with a top edge higher than the mounting part; the sand blasting machine is provided with a sand cavity cover, the installation part is provided with a connection part matched with the sand cavity cover, and the sand cavity cover is provided with a sealing ring. After the sand cavity cover and the mounting part are connected in place, the sealing ring is compressed between the sand cavity cover and the top edge. The topside in sand chamber exceeds the installation department, avoids the powder in the sand chamber to fall into in the gap of sand chamber and installation department junction.

Preferably, the outlet aperture of the pressurized air delivery conduit 14 and the air powder inlet of the gas conduit are below the top edge of the sand chamber. The air outlet and the air powder inlet are located in the sand cavity, so that all powder (or called sand powder) in the sand cavity can be dispersed by the aid of pressurized air, the powder filled each time can be used up, and the use-up rate of the pre-filled powder in the sand cavity is improved.

Preferably, the sand chamber has an outwardly extending outer rim, the mounting portion being within the area covered by the outer rim. So, the junction between sand chamber and the installation department is hidden completely in the sand chamber, and during the dusting, the powder can not fall into the connection region between sand chamber and the installation department yet. Preferably, the mounting part and the sand chamber cover are connected by a thread pair.

Preferably, the sand chamber cover has a transparent window. The marking line is in the visible range of the window.

The invention has the advantages that: 1. the shell, the inner frame and the nozzle are three mutually independent parts and can be made of different materials, so that the manufacturing cost is reduced. 2. The inner frame can be made of plastic materials, the joint part is also a plastic part, the plastic joint part of the nozzle assembly is connected with the machine body assembly in a plug-in mode, and abrasion between the nozzle assembly and the machine body assembly is reduced by utilizing self-lubrication and abrasion resistance of the plastic materials. 3. The clamping spring is passivated at the end, so that abrasion among the clamping spring, the machine body assembly and the nozzle assembly is avoided or reduced, and the service time of precise combination of the machine body assembly and the nozzle assembly is prolonged. 5. The nozzle conducts the water flow directionally through the water guide part, so that the sprayed water flow is uniform and the force is concentrated. 6. A sealing cylinder is arranged between the gas pipeline of the machine body assembly and the gas pipeline of the nozzle assembly and is respectively connected with the two gas pipelines in a sealing way, the two gas pipelines are not in direct contact, and the gas pipelines are not abraded; the gas pipeline is a rigid part, the sealing cylinder is a flexible part, the sealing cylinder has good wear resistance and is not easy to deform, and the inserting times of the nozzle assembly and the machine body assembly are increased; the service life of the sand blasting machine is prolonged, and no sand leakage or blockage is guaranteed. 7. The machine body component and the nozzle component are matched through concentric steps, and the machine body component and the nozzle component can rotate smoothly and relatively.

Drawings

FIG. 1 is a schematic view of a nozzle assembly.

Fig. 2 is a sectional view of fig. 1.

Fig. 3 is a schematic view of the internal frame.

Fig. 4 is a schematic view of the position of the water outlet on the body assembly.

Fig. 5 is a schematic view of a housing, in which (a) is a front view of the housing, (b) is a sectional view a-a of (a), (c) is the housing from one perspective, and (d) is the housing from another perspective.

Fig. 6 is a perspective view of the nozzle.

Fig. 7 is a cross-sectional view of a nozzle.

Fig. 8 is a cross-sectional view of a second nozzle with a connector.

Fig. 9 is a sectional view of a third nozzle.

FIG. 10 is a schematic view of a nozzle tube, wherein (a) is a schematic view of a nozzle tube of one configuration, (b) is a schematic view of a nozzle tube of a second configuration, and (c) is a schematic view of a nozzle tube of a third configuration.

Fig. 11 is a schematic view of a circlip.

Fig. 12 is a water jet comparison diagram of a nozzle, in which (a) is a water jet diagram of a nozzle of the related art and (b) is a water jet diagram of a nozzle of the present invention.

Fig. 13 is a schematic view of a gas pipeline.

Fig. 14 is a schematic view of a coupling head of a gas pipe.

Fig. 15 is a schematic view of a water pipe.

Fig. 16 is a schematic view of a nut.

Fig. 17 is a schematic view of the connection of the gas conduits of the block assembly and the nozzle assembly.

Fig. 18 is a cross-sectional view of a sealing cartridge.

Fig. 19 is an enlarged view of a portion K of fig. 17.

Fig. 20 is a schematic view of a sand chamber.

Detailed description and specific embodiments

The invention is described in detail below with reference to the accompanying drawings:

the dental blasting machine carries out tooth treatment through an abrasive powder jet flow mixed with air and water, and the dental blasting machine comprises a machine body assembly and a nozzle assembly, wherein the machine body assembly is connected with the nozzle assembly in a plug-in mode.

Nozzle assembly

In some embodiments, as shown in fig. 1 and 2, a nozzle assembly of a pneumatic dental blasting apparatus includes a housing 1, a gas pipe 2, a water pipe 3, and a nozzle 4, the gas pipe 2 and the water pipe 3 being fixed to the nozzle 4, respectively; one end of the shell 1 is connected with the nozzle 4, and the other end is a joint part; the housing 1 has an inlet 301 for the water conduit 3.

The joint part connects the nozzle assembly with the machine body assembly in a sealing manner to form a working sand blasting machine. After the nozzle assembly is connected with the machine body assembly, the water outlet 12 (shown in fig. 4) of the water pipeline of the machine body assembly is connected with the water inlet 301 (shown in fig. 1-3) of the water pipeline of the nozzle assembly through a sealed cavity or space, so that water flow is conveyed from the machine body assembly to the nozzle assembly and then sprayed out from the nozzle. After the nozzle assembly and the machine body assembly are connected in a sealing mode, the gas pipeline of the machine body assembly is connected with the gas pipeline 2 of the nozzle assembly in a sealing mode, and the powder-air mixture is conveyed to the nozzle assembly from the machine body assembly and then sprayed out from the nozzle. The air nozzle 4 has an inner air nozzle and a water outlet outside the air nozzle.

Shell body

The casing forms nozzle assembly's outward appearance, and among the sand blasting machine, casing one end sets up the nozzle, and organism subassembly is connected to the other end, and the sand blasting machine is when using, and the casing is handed to the doctor. The shell and the nozzle are in direct contact with the oral cavity of a human body, and one person needs to use one machine, so that the shell and the nozzle need to be sterilized after each use.

In some embodiments, as shown in FIG. 2, the housing 1 and the nozzle 4 are removably mated, the housing 1 has a baffle through which the gas conduit 2 passes and is locked, and the combination of the gas conduit 2 and the housing 1 locks the nozzle 4 and the housing 1.

In some embodiments, as shown in fig. 3 and 5, the housing 1 comprises an outer shell 101 and an inner frame 102, the inner frame 102 being inside the outer shell 101; the joint part is provided at one end of the inner frame 102, the gas pipe 2 passes through the other end of the inner frame 102 and is locked, and the combination of the gas pipe 2 and the inner frame 102 locks the nozzle 4, the outer case 101, and the inner frame 102. The gas pipeline of the nozzle assembly penetrates through the connecting end of the inner frame and is communicated with the gas pipeline of the machine body assembly. The outer casing 101, the inner frame 102 and the nozzle 4 are three separate parts, and the inner frame 102, the outer casing 101 and the nozzle 4 are joined together while locking between the gas pipe and the inner frame.

In some embodiments, the through hole is provided with a locking member, and the locking member is tightly matched with the gas pipeline; or the through hole is in interference fit with the gas pipeline. Such as locking the locking member with the gas pipe through an inclined plane, key matching, etc. Alternatively, as shown in fig. 2 and 16, the nozzle assembly is provided with a locking member 7, the locking member 7 is abutted against a baffle 1022 of the inner frame, the locking member 7 is fixedly connected with the gas pipeline through a thread pair, or the locking member 7 is tightly matched with the gas pipeline; the gas duct has a connection end that exposes the retaining member 7. This locking element 7 is a separate part from the inner frame and during assembly, the gas pipe is connected to the gas pipe by means of the locking element 7 after it has been passed through the inner frame baffle, indicating that the locking element 7 is connected in place with the gas pipe when the locking element 7 is held against the inner frame. The locking piece 7 is a nut, and a threaded section is arranged on the gas pipeline. The nut is engaged with the threaded section.

The locking piece and the gas pipeline are used for locking the shell and the nozzle, so that the shell, the inner frame and the nozzle can be made of different materials respectively. For example: the nozzle is made by MIM metal injection molding, and the shell and the inner frame are made of PEAK and/or PPSU high-temperature resistant sterilization materials. The nozzle assembly needs to be sterilized after each use, the outer shell and the inner frame made of PAEK and PPSU high-temperature sterilization materials are heated to 200 times and 500 times, and the outer shell and the inner frame are likely to be damaged and broken, and the MIM injection-molded nozzle is not basically damaged under high-temperature sterilization, so that the locking assembly mode is used, when the outer shell and/or the inner frame are damaged, only the damaged part needs to be replaced, the nozzle can still be continuously used, and the use cost for the nozzle is reduced.

Adopt with gas pipeline interference fit's mode, manufacturing cost practices thrift and simple to operate, nevertheless can cause the casing internal stress change and lead to the fracture in the high temperature sterilization process. The nut is fastened by the aid of the nut, the nut is meshed with the thread section through the thread pair, internal stress is avoided, breakage of the shell can be reduced, and the service life of the nozzle assembly is prolonged.

Inner frame

The inner frame is used for pressing the outer shell towards the direction of the nozzle, is matched with the gas pipeline to lock the nozzle and the shell, and contains the water pipeline.

In some embodiments, as shown in fig. 3, the inner frame 102 includes a barrel, a joint portion 1021 is provided at a first end of the barrel, and a baffle is provided at a second end 1022 of the barrel, the baffle having a through hole 1024 for allowing the gas pipe 2 to pass therethrough. In some embodiments, as shown in fig. 3 and 5, the outer surface of the inner frame 102 is provided with a first step 1023, and the inner surface of the outer housing is provided with a second step 1012 matching the first step 1023; the second step 1012 is adjacent to the nozzle 4 opposite to the first step 1023. With the locking member 7 engaged with the gas conduit, the first step 1023 moves the housing against the second step 1012 in a direction closer to the nozzle 4. The first step 1023 and the second step 1012 are both annular steps.

In some embodiments, as shown in fig. 17, the water inlet 301 of the water pipe 3 is provided in the inner frame 102, and the sealing ring 8 is provided between the inner frame 102 and the water pipe 3. As shown in fig. 15, the water pipe 3 is bent to avoid the inner frame 102, a portion of the water pipe 3 is positioned between the inner frame 102 and the outer shell 1, and the packing 8 serves to fix an end of the water inlet of the water pipe 3 by positioning the water pipe 3 in addition to preventing water from entering the region between the inner frame 102 and the outer shell 1. As shown in fig. 3, the barrel of the inner frame 102 has an accommodating part 1025 for accommodating a water pipe, the accommodating part 1025 is a notch opened on the surface of the barrel, or the accommodating part 1025 is a hole opened on the barrel, and the accommodating part 1025 is communicated with the water inlet. The portion 1025 holds plays limiting displacement to the water pipeline, holds by the end of intaking of the fixed water pipeline of sealing washer 8 at last, as shown in fig. 17, and the end of intaking of water pipeline sets up sealing washer 8.

Outer casing

The outer housing forms the exterior of the nozzle assembly, the outer housing positioning the inner frame and the nozzle.

In some embodiments, as shown in fig. 2, one end of the housing 1 abuts against the nozzle 4, and a limiting member for preventing the housing 1 and the nozzle 4 from rotating relative to each other is disposed between the joint surfaces of the housing 1 and the nozzle 4. Therefore, after the housing 1 and the nozzle 4 are combined, the housing 1 and the nozzle 4 do not rotate and displace, and the stability of the nozzle assembly is kept. As shown in fig. 5 (d) and 6, the projection 1013 is provided on the housing 101, the recess 4032 matching the projection 1013 is provided on the nozzle 4, and the projection 1013 is provided in the recess 4032 to restrict the rotational freedom between the housing 101 and the nozzle 4.

In some embodiments, as shown in fig. 5, a positioning rib 1011 is disposed inside the housing 101, the positioning rib 1011 contacts the inner frame 102, and the positioning rib 1011 is spaced apart from the first step 1012. When the combination of the inner frame 102, the outer shell 101 and the nozzle 4 is completed, the positioning ribs 1011 and the inner frame 102 are squeezed against each other, and the inner frame 102, the gas pipeline 2 and the water pipeline 3 are prevented from shaking. The number of the positioning rib plates 1011 is plural, and the plurality of the positioning rib plates 1011 are uniformly arranged along the periphery of the inner frame. The barrel of the inner frame 102 is cylindrical, and the contact surface of the positioning rib plate 1011 and the barrel is arc-shaped. Thereby increasing the contact area between the inner frame 102 and the positioning rib 1011 and improving the positioning stability of the inner frame 102.

Nozzle with a nozzle body

In some embodiments, as shown in fig. 8 and 10, the nozzle has a water spray passage a and a gas injection passage B, the gas injection passage B being internal and the water spray passage a being external to the gas injection passage B; the water spray passage a is formed by communicating the water inlet portion 4022 with the water guide portion 4023, and there are a plurality of water guide portions 4023, and an outlet of each water guide portion 4023 serves as an outlet of one water spray passage a.

As shown in fig. 7, 8 and 10, the nozzle 4 includes a body 401 and a nozzle pipe 402, the nozzle is connected to the water pipe 3 and the gas pipe 2, respectively, the nozzle 4 has a water spraying passage a and a gas spraying passage B, the gas spraying passage B is inside, and the water spraying passage a is outside the gas spraying passage B; the body 401 is tightly matched with the nozzle pipe 402, a water spraying channel A is arranged in the nozzle pipe, a water inlet part 4022 and a water guide part 4023 are arranged between the nozzle pipe 402 and the body 401, and the water inlet part 4022 is communicated with the water guide part 4023 to form the water spraying channel A.

The water guide portions 4023 are plural, and outlets of the water guide portions 4023 are uniformly distributed around the air blowing passage B. The area of the nozzle pipe 4 except the water inlet and outlet channel A is attached to the body, water can be sprayed out of the water outlet channel A only, fixed-point and uniform water outlet is achieved, the outward spraying force of the water is improved, the spraying range of water flow and sand particles is focused, and the tooth cleaning efficiency is improved. The cleaning efficiency is improved, the natural sand blasting time is shortened, and the loss of the sand powder is reduced.

As shown in fig. 7, the body 401 of the nozzle has a water pipe connection passage 4012 and a gas pipe connection passage 4011, the water pipe connection passage 4012 is fixed to the water pipe 3, and the gas pipe connection passage 4011 is fixed to the gas pipe 2. The body 401 of the nozzle has a nozzle pipe mounting hole 4013, the nozzle pipe 402 is inserted into the nozzle pipe mounting hole 4013, and the nozzle pipe 402 is tightly fitted to the body 401. As shown in fig. 6, the nozzle has an extension 403 connected to the housing, the extension 403 and the body 401 forming a positioning step 4031 therebetween. The positioning step 4031 may occur whenever there is a dimensional change between the body 401 and the extension 401. The housing 101 is shown in position with the nozzle 4 when the housing 101 is against the retaining step 4031.

As shown in fig. 5 (d) and fig. 6, the limiting member is disposed between the extending section and the housing, the extending section is inserted into the housing, the limiting member is a protrusion 1013 and a groove 4032 that are matched with each other, the protrusion 4031 is located in the extending section, the groove is located in the housing, or the protrusion is located in the housing, and the groove is located in the extending section. When the projection is inserted into the groove, the rotational freedom of the nozzle and the housing is unified. The protrusion is a rectangular block, and the groove is a rectangular groove. The locating parts are multiple and evenly distributed between the shell and the extension section.

In some embodiments, as shown in fig. 7, the body of the nozzle is formed by MIM injection molding, which forms a water pipe connection 4012, a gas pipe connection 4011, and a steel pipe receiving chamber 4013. Accomplish the MIM of body and mould plastics the back, reuse laser welding links to each other water pipeline and water piping connection passageway, links to each other gas pipeline and trachea connecting channel with laser welding, holds the chamber 4013 with nozzle pipe 402 impressed steel pipe in, nozzle pipe 402 and body interference fit.

In other embodiments, as shown in fig. 8, the nozzle has a connector 10, the connector 10 has an air pipe connector 1001, a water pipe connector 1002 and a nozzle pipe connector 1003, the air pipe connector and the water pipe connector are respectively communicated with the nozzle pipe connector, and the connection part of the air pipe connector and the nozzle pipe connector is staggered with the connection part of the water pipe connector and the nozzle pipe connector.

When the nozzle is manufactured, the nozzle pipe 402 is fixed in the nozzle pipe connector 1003, the air inlet hole is communicated with the air pipe connector and the air injection channel B, and the water inlet portion 4022 is communicated with the water pipe connector and the water injection channel A. Connecting piece 10 and water pipeling, gas pipeline, nozzle union coupling accomplish the back, carry out the moulding plastics of nozzle body, the nozzle pipe all laminates with the body except that the region of advancing water spray channel A, and water can only be outwards spout from water spray channel A, realizes fixed point, even play water, improves the outside strength that sprays of water.

In other embodiments, as shown in fig. 10, the gas pipeline, the water pipeline and the nozzle pipe are fixed to the nozzle body, the gas pipeline is provided with a mounting hole, the nozzle pipe is inserted into the mounting hole, and the gas pipeline is communicated with the gas injection channel B; the water pipeline is provided with a water jet penetrating through the water pipeline, and the nozzle pipe penetrates through the water jet and the water jet is aligned with the water inlet portion 4022.

When the nozzle is manufactured, the nozzle pipe penetrates through a water spray nozzle of a water pipeline and then is inserted into a mounting hole of a gas pipeline, then the nozzle is subjected to injection molding, the areas of the nozzle pipe except the water inlet and outlet channel A are attached to the body, water can only be sprayed out from the water inlet and outlet channel A, fixed-point uniform water outlet is achieved, and the force of water spraying outwards is improved.

Nozzle pipe

In some embodiments, as shown in fig. 10, the nozzle pipe 402 is a hollow cylinder with the same outer diameter, the nozzle pipe 402 is provided with an air inlet 4021, an air inlet 4022 and a water guide 4023, the air inlet 4021 is communicated with an inner cavity of the nozzle pipe 402, the air inlet 4022 and the water guide 4023 are isolated from the inner cavity of the nozzle pipe 402, and the air inlet 4022 is located between the water pipe and the water guide 4023; the outlet of the inner cavity of the nozzle pipe 402 serves as an air outlet of the nozzle 4, and the outlet of the water guide 4023 serves as a water jet of the nozzle.

In some embodiments, as shown in fig. 10 (a), the sectional shape of the water guide portion is rectangular, semicircular, arc-shaped, V-shaped, U-shaped, L-shaped, trapezoidal, or the like.

As shown in fig. 10 (b), the end of the water guiding section is provided with an extension section 4024, the extension section is cylindrical, and the extension section is smaller than the pipe body. Therefore, an annular gap is formed between the extension section and the nozzle, and water flows out through the fixed point of the water guide part and then is converged into a ring at the extension section. When the nozzle is used, the water flow of all the diversion trenches is converged into a beam and then is sprayed out. The length of the extension section does not consume the strength of water flow jet, and the water flow can be converged into a bundle to be jetted.

The pipe body of the nozzle pipe is in interference fit with the steel pipe connecting channel of the connecting piece, the air pipe connecting section and the water inlet part are positioned in the connecting piece, and part of the water guide section is exposed out of the connecting piece.

As shown in fig. 10 (c), the water guide section is prism-shaped, the side surface of the water guide section serves as a water guide part, and the water guide section is inscribed with the outer circle of the nozzle pipe. The water diversion section is a regular prism; the edge of the water guide section is a round angle. When the nozzle pipe is embedded in the nozzle body, a channel allowing the water flow channel to flow is formed between the water guide part and the body. The prismatic water diversion section is convenient to process, the water yield of the single-point waterline is large, and the cleaning efficiency is high.

Gas pipeline

The gas pipeline of the nozzle assembly is connected with the gas pipeline of the machine body assembly to form a conveying line for conveying the powder-air mixture. In some embodiments, the gas pipe 2 has one end fixed to the nozzle and the other end being a connection section for connection to the body assembly, and the gas pipe has a locking portion fastened to the housing adjacent to the connection section. The locking portion is an external thread. The nut is arranged in the shell and engaged with the locking part to achieve the purpose of locking the gas pipeline and the shell. The locking portion may be integral with the gas conduit.

In some embodiments, as shown in fig. 13, the gas pipe 2 includes a pipe body 201 and a connector 202, the connector 202 is fixed to the pipe body 201, and the locking portion 2021 and the connecting portion 2022 are disposed on the connector 202. The gas pipeline 2 is formed by combining the connector 202 and the pipe body 201, the existing gas pipeline can still be adopted as the pipe body, and only the locking part (such as external threads) needs to be processed on the connector 202, so that the manufacturing cost is reduced.

As shown in fig. 14, the locking portion 2021 of the connection head 202 is enlarged relative to the connection section 2022. Thus, a limit step can be formed between the connecting section 2022 and the locking section 2021. The limiting step is 2023 inclined plane. When the connecting section is matched with the machine body assembly, the limiting step 2023 is locked through the inclined plane.

Clamp spring

When the nozzle assembly is combined with the machine body assembly, a C-shaped clamp spring 9 is arranged between the nozzle assembly and the machine body assembly, and the clamping connection of the nozzle assembly and the machine body assembly is realized by utilizing the deformation of the clamp spring 9.

In some embodiments, a C-shaped clamp spring 9 is arranged between the nozzle assembly and the machine body assembly, and two ends of the clamp spring 9 are passivated. If the end is spherical, cambered or chamfered, the end is passivated.

The clamp spring 9 is arranged at the joint part of the inner frame. The body assembly is provided with a clamp spring groove matched with the clamp spring 9.

As shown in fig. 11, each end of the snap spring 9 is respectively an inclined surface facing the body component. The inclined plane faces the machine body assembly, and the inclined plane and the inner ring of the clamp spring 9 form an obtuse angle. The inner ring has a small diameter and the outer ring has a large diameter. The inclined plane reduces the abrasion between the clamp spring 9 and the machine body assembly.

The edge of the inclined plane is a smooth curved surface. When smooth curved surfaces such as bulb, cambered surface are in the both ends of jump ring 9, do not have the cutting between jump ring 9 and the organism subassembly, therefore when nozzle assembly and organism subassembly plug-in connection, can avoid jump ring 9 and organism subassembly wearing and tearing each other.

Sealing cylinder

The sealing cylinder 5 is used as a part for connecting and sealing the gas pipeline of the nozzle assembly and the gas pipeline of the machine body assembly, and the purposes of preventing sand blockage and leakage in the process of conveying the air powder mixture are achieved. The sealing cylinder 5 is made of flexible materials, and the sealing cylinder 5 is connected with the gas pipeline in a sealing mode. For example, the sealing cylinder 5 is a silica gel cylinder, and the sealing cylinder 5 is connected with the gas pipeline 2 in a sealing manner. The outside of the sealed cylinder 5 is provided with a connecting shell. The connecting shell plays a role in supporting the sealing barrel and avoiding sand leakage or sand blockage caused by deformation of the sealing barrel due to the insertion of the machine body assembly and the gas pipeline.

In some embodiments, as shown in fig. 18, the sealing cylinder 5 includes a plug end connection 501 and a fixed end connection 502 at both ends, and a transition cavity 503, the transition cavity 503 is located between the plug end connection 501 and the fixed end connection 502, the plug end connection 501 is connected with a connection section of a gas pipe of the nozzle assembly, and the fixed end connection 502 is used for connecting with the gas pipe of the machine body assembly.

The sealing cylinder 5 is a tube body made of wear-resistant elastic materials such as a silicone tube, a latex tube or a rubber tube.

That is to say, the gas pipeline of organism subassembly and the gas pipeline of nozzle assembly do not direct contact, but respectively in the contact of sealed section of thick bamboo, and sealed section of thick bamboo is made for flexible material, and sealed section of thick bamboo has good wearability and has good elastic deformation and the ability of recovering deformation, postpones to leak sand, the stifled sand appearance.

A sealing cylinder is arranged between the gas pipeline of the machine body assembly and the gas pipeline of the nozzle assembly and is respectively connected with the two gas pipelines in a sealing way, the two gas pipelines are not in direct contact, and the gas pipelines are not abraded; the gas pipeline is a rigid part, the sealing cylinder is a flexible part, the sealing cylinder has good wear resistance and is not easy to deform, and the inserting times of the nozzle assembly and the machine body assembly are increased; the service life of the sand blasting machine is prolonged.

Before the sand blasting machine is used, the nozzle assembly and the machine body assembly are in butt-inserting sealing connection, and when water flows into the nozzle assembly from the machine body assembly, the water flows into a water pipeline of the nozzle assembly through a gap between the machine body assembly and the nozzle assembly. In the sand blasting machine in the prior art, a gas pipeline of a machine body assembly and a gas pipeline of a nozzle assembly are connected in a mode that two metal gas pipelines are in contact, and a sealing ring is arranged between the two gas pipelines for sealing. However, in the long-term sand blasting process, the metal pipe wall is damaged due to sand powder in the sand blasting process, and water vapor enters the connecting part of the two gas pipelines from the space between the body assembly and the nozzle assembly, so that the sand powder is agglomerated in the gas pipelines and the gas pipelines are blocked. Herein, two ends of the sealing cylinder are respectively connected with the two gas pipelines, the two gas pipelines are not contacted, and the sand powder collides when passing through the joint of the two gas pipelines is the sealing cylinder, which is equivalent to convert the impact on the metal gas pipelines into the impact on the sealing cylinder. The sealing barrel is used for realizing the transition of sand particles from the machine body assembly to the nozzle assembly, has elasticity, and can rebound when sand powder touches the wall of the sealing barrel in the sand blasting process without abrasion. The problem of breakage of the metal tube is solved, so that the life of the nozzle assembly is increased. The sealing barrel not only plays a role in sealing and isolating water vapor, but also plays a role in buffering the impact of the sand powder on the gas pipeline, so that the sand powder is smoothly transferred from the machine body assembly to the nozzle assembly.

Concentric step

In some embodiments, the body assembly of the pneumatic dental sander has a step C, and the nozzle assembly has a mating surface D that mates with the step C; the step C or the surface of the step C is a plastic piece.

Two steps C are simultaneously contacted with the corresponding matching surface D, and the two steps C are concentric; each step C corresponds to one mating surface D. The two concentric steps C support the matching of the nozzle assembly and the machine body assembly, the circle center connecting line of the two steps C is used as an axis, and the nozzle assembly and/or the machine body assembly rotate around the axis. Thereby guarantee in the course of the work, the sand cavity of organism subassembly is up all the time, and the air powder mixture can be carried smoothly.

And a sealing ring for sealing water flow is arranged on the machine body assembly and is positioned between the two concentric steps C. The step C is a conical step C, and the matching surface D is a slope.

In some embodiments, the mating surface D of the nozzle assembly is disposed on the joint portion of the nozzle assembly, the step C of the body assembly is disposed on the joint portion of the body assembly, the joint portion of the nozzle assembly is a plastic part, and the joint portion of the body assembly is an integrally formed metal part. The joint part of the nozzle assembly is positioned on the inner frame, the inner frame is independent from the shell, and the inner frame can be made of plastic, so that the joint part is made of plastic. At this time, the joint portion of the body assembly only needs to be integrally formed with two concentric steps C. The mode of two concentric steps C is formed in an integrated mode, the direct concentricity of the two steps C is reliable, and the processing is convenient.

Alternatively, in some embodiments, the mating surface D of the nozzle assembly is a metal part, and the step C of the body assembly is a plastic part. Preferably, the body assembly comprises a metal fitting body and plastic collars, each plastic collar forming a step C, the plastic collars being secured to the fitting body. The plastic lantern ring is fixed on the joint body in the modes of interference fit, bonding, thermoplastic or injection molding and the like.

Sand cavity

The sand cavity is a cavity used for storing sand powder in the sand blasting machine. The gas pipeline of forced air conveyer pipe and organism subassembly all inserts the sand intracavity, and behind the forced air entering sand chamber, the sand powder is dispersed and is formed the air powder mixture, and in the air powder mixture got into the gas pipeline, the sand powder got to be carried.

In some embodiments, as shown in FIG. 20, the sand chamber 13 of the sander has a maximum powder addition marker line 131 located therein. The maximum add power marker line may indicate the maximum amount of powder the physician has added. A pressurized air conveying pipe 14 and a gas pipeline 15 of the machine body component are arranged in the sand cavity, the pressurized air conveying pipe 14 is provided with an air outlet, and an air powder inlet is arranged on the gas pipeline 15 of the machine body component; the marker line 131 is lower than the air outlet and the air powder inlet. The phenomenon that powder (sand powder) enters the pressurized air conveying pipeline 14 and the gas pipeline due to too much powder adding of a client is avoided, and sand blockage is caused. The inner surface of the sand cavity is spherical.

The body assembly of the sand blasting machine is provided with a mounting part 16 of a sand cavity 13, the sand cavity 13 is embedded and fixed in the mounting part 16, and the sand cavity 13 is provided with a top edge 132 higher than the mounting part 16; the sand blasting machine has a sand chamber 13 cover, the mounting portion 16 has a connecting portion which is fitted with the sand chamber 13 cover, and the sand chamber 13 cover has a seal ring. After the sand chamber 13 cover is attached to the mounting portion 16, the gasket is compressed between the sand chamber 13 cover and the top edge 132. The top edge 132 of the sand chamber 13 is higher than the mounting part 16, so that powder in the sand chamber 13 is prevented from falling into a gap at the joint of the sand chamber 13 and the mounting part 16.

The outlet aperture of the pressurised air delivery conduit 14 and the air powder inlet of the gas conduit are below the top edge of the sand chamber 13. The air outlet and the air powder inlet are positioned in the sand cavity 13, so that all the powder (or called sand powder) in the sand cavity 13 can be dispersed by the aid of pressurized air, the powder filled each time can be used up, and the use-up rate of the pre-filled powder in the sand cavity 13 is improved.

The sand chamber 13 has an outwardly extending outer annular edge with the mounting portion 16 in the area covered by the outer annular edge. Thus, the sand cavity 13 completely covers the joint between the sand cavity 13 and the mounting part 16, and when powder is added, the powder cannot fall into the connecting area between the sand cavity 13 and the mounting part 16.

The mounting part 16 and the sand cavity 13 cover are connected by a screw pair. The sand chamber 13 cover has a transparent window. The marking line is in the visible range of the window.

Detachable nozzle assembly

In some embodiments, the nozzle assembly comprises a housing 1, a nozzle 4 and a gas conduit 2, the nozzle 4 being fixed to the gas conduit 2; the shell 1 is detachably matched with the nozzle 4, the gas pipeline 3 is provided with a threaded section, the shell 1 is provided with a baffle plate, the threaded section penetrates through the baffle plate and is meshed with the nut 7, and the gas pipeline 2 and the nut 7 lock the shell 1 and the nozzle 4. The threaded section 202 is disposed on the connector, and the connector is fixedly connected to the gas pipe 2. The connector is fixed in the tip of gas pipeline 2, and the connector has the linkage segment with organism subassembly intercommunication.

When the nut 7 is locked in place with the threaded section 202, the nut 7 abuts against the stop 1022. The inner diameter of the through hole is larger than the outer diameter of the threaded section 202 and the through hole is smaller than the nut 7. The end of the nut 7 abutting against the stop 1022 is a first end, and a second end of the nut 7 is provided with a force application portion. The force application part is a straight groove or a stop plane. For example, if the nut 7 is a hexagonal nut 7, each side of the nut 7 is a stop plane. For another example, the outer surface of the nut 7 has a flat surface, and the nut 7 can rotate along with the sleeve by using the sleeve matched with the shape of the nut 7 and abutting against the flat surface of the nut 7, so that the flat surface of the outer surface of the nut 7 is a stop flat surface. During assembly, the inner frame 102 is inserted into the outer shell 101, and the gas pipeline 2 is aligned to the through hole; pushing the step C of the inner frame 102 to the step C of the outer shell 101, and enabling the threaded section 202 of the gas pipeline 2 to penetrate through the through hole; the nut 7 is rotated along the threaded section 202 until the step C of the inner frame 102 and the step C of the outer shell 101 abut against each other. When the outer shell 101 and the inner frame 102 need to be disassembled, the nut 7 is unscrewed and taken out, and the outer shell 101 and the inner frame 102 can be separated, so that the nozzle 4 assembly is convenient to disassemble, maintain and replace parts.

Anti-blocking sand blasting machine

In some embodiments, the anti-clogging blasting machine comprises a body assembly and a nozzle assembly which are connected in a plug-in mode, the nozzle assembly and the body assembly are respectively provided with a gas pipeline, and the gas pipeline of the nozzle assembly is communicated with the gas pipeline of the body assembly through a sealing cylinder.

As shown in fig. 17, the gas pipe 2 of the nozzle assembly is hermetically connected to the sealing cylinder 6, the gas pipe 7 of the body assembly is also connected to the sealing cylinder, and the sealing cylinder serves as an intermediate chamber to communicate the two gas pipes. The sealing cylinder is of a pipe type with openings at two ends, and connecting parts which are in sealing fit with the two gas pipelines are respectively arranged at two ends of the sealing cylinder.

In some embodiments, there is a transition chamber 503 between the gas conduit of the nozzle assembly and the gas conduit of the block assembly, the transition chamber 503 being the interior chamber of the seal cartridge. The outlet of the transition chamber 503 is connected to the gas line of the nozzle assembly and the inlet of the transition chamber 503 is connected to the gas line of the block assembly. The term "connected" means that when the gas flow enters the transition chamber 503 from the gas conduit of the body assembly, the transition chamber 503 is free from blocking the gas flow, and when the gas flow enters the gas conduit of the nozzle assembly from the transition chamber 503, the gas conduit of the nozzle assembly blocks the gas flow.

In some embodiments, as shown in fig. 18, two ends of the sealing cylinder are respectively provided with a connecting portion which is in sealing fit with two gas pipelines, wherein one connecting portion is a fixed end connecting portion 502, the other connecting portion is a plugging end connecting portion 501, the fixed end connecting portion 502 has a groove, and the gas pipeline connected with the fixed end connecting portion 502 is provided with a protrusion which can be embedded into the groove; the spigot end connection 501 is a cavity that fits tightly with another gas conduit.

The outer end of the plug end connection 501 is provided with a guide slope.

In some embodiments, the sealing cylinder is a rubber cylinder or a silicone cylinder.

The fixed end connecting part 502 is connected with a gas pipeline of the machine body assembly, and the machine body assembly is provided with a protective shell for wrapping the sealing cylinder in the machine body assembly; the spigot end connection 501 is connected to the gas conduit of the nozzle assembly. The protective shell and the gas pipeline clamp the sealing cylinder between the protective shell and the gas pipeline, so that the sealing cylinder has the existing flexibility in a plug-in type with the gas pipeline of the nozzle assembly to realize sealing connection, and has the rigidity to avoid the connection failure caused by the deformation of the sealing cylinder.

The insertion end connecting portion 501 is provided with a guide slope. The guide slope is matched with the limiting step C, and when the gas pipeline is inserted in place, the limiting step C is close to the guide slope. The contact area of the two inclined surfaces is increased, and the reliability of sealing is improved.

Preferably, the sealing cartridge is arranged on the machine body assembly. Because the nozzle assembly requires one person for one machine during use, i.e., the nozzle assembly needs to be sterilized after each customer who performs blasting for tooth cleaning. The sealing cylinder is arranged on the machine body assembly, and the sealing cylinder does not limit the applicable disinfection mode of the nozzle assembly. In addition, the sealing cylinder is not disinfected by high temperature, high pressure, ultraviolet rays and the like, the service life of the sealing cylinder can be prolonged, and the sand-blasting machine is guaranteed to be free from sand leakage and sand blockage in long-term use.

Of course, it is also an option to provide the sealing cartridge on the nozzle assembly, only in a sterilization mode suitable for the sealing cartridge. In some embodiments, the fixed end connection 502 is connected to a gas conduit of the nozzle assembly and the mating end connection 501 is connected to a gas conduit of the body assembly.

Pneumatic dental sand blasting machine

As shown in fig. 16 and 19, the pneumatic dental blasting machine comprises a nozzle assembly and a machine body assembly, wherein the machine body assembly is provided with a step C, and a matching surface D matched with the step C is arranged on the nozzle assembly; the step C or the surface of the step C is a plastic piece.

Two steps C are simultaneously contacted with the corresponding matching surface D, and the two steps C are concentric; each step C corresponds to one mating surface D. The two concentric steps C support the matching of the nozzle assembly and the machine body assembly, the circle center connecting line of the two steps C is used as an axis, and the nozzle assembly and/or the machine body assembly rotate around the axis. Thereby guarantee in the course of the work, the sand cavity 13 of organism subassembly is up all the time, and the air powder mixture can be carried smoothly.

When the joint part of the nozzle assembly and the joint part of the machine body assembly are both metal pieces, in order to avoid the metal surface from being directly contacted to generate severe abrasion, two plastic lantern rings are arranged on the joint part of the machine body assembly, the plastic lantern rings are contacted with the joint part of the nozzle assembly, and a gap is reserved between the area of the joint part of the machine body assembly except the plastic lantern rings and the joint part of the nozzle assembly. Therefore, the concentricity of the two metal surfaces is prevented from being increased due to direct abrasion. The invention shown and described herein may be practiced in the absence of any element or elements, limitation or limitations, which is specifically disclosed herein. The terms and expressions which have been employed are used as terms of description and not of limitation, and there is no intention in the use of such terms and expressions of excluding any equivalents of the features shown and described or portions thereof, and it is recognized that various modifications are possible within the scope of the invention. It should therefore be understood that although the present invention has been specifically disclosed by various embodiments and optional features, modification and variation of the concepts herein described may be resorted to by those skilled in the art, and that such modifications and variations are considered to be within the scope of this invention as defined by the appended claims.

The contents of the articles, patents, patent applications, and all other documents and electronically available information described or cited herein are hereby incorporated by reference in their entirety to the same extent as if each individual publication was specifically and individually indicated to be incorporated by reference. Applicants reserve the right to incorporate into this application any and all materials and information from any such articles, patents, patent applications, or other documents.

Claims

1. A nozzle component of a pneumatic dental sand blasting device comprises a shell, a gas pipeline, a water pipeline and a nozzle, wherein the gas pipeline and the water pipeline are respectively fixed with the nozzle; one end of the shell is connected with the nozzle, and the other end of the shell is a joint part; the shell is provided with a water inlet of a water pipeline; the method is characterized in that: the shell comprises an outer shell and an inner frame, and the inner frame is arranged in the outer shell; the joint part is arranged at one end of the inner frame, the gas pipeline penetrates through the other end of the inner frame and is locked, and the combination of the gas pipeline and the inner frame locks the nozzle, the shell and the inner frame.

2. The nozzle assembly of a pneumatic dental blasting apparatus of claim 1, wherein: the inner frame is provided with a locking piece which is tightly matched with the gas pipeline.

3. The nozzle assembly of a pneumatic dental blasting apparatus of claim 1, wherein: the nozzle assembly is provided with a locking piece, the locking piece abuts against the end plate of the inner frame, and the locking piece is fixedly connected with the gas pipeline through a thread pair or is tightly matched with the gas pipeline; the gas conduit has a connecting end exposed from the retaining member.

4. The nozzle assembly of the pneumatic dental blasting apparatus of claim 2 or 3, wherein: the locking piece is a nut, and a threaded section is arranged on the gas pipeline.

5. The nozzle assembly of a pneumatic dental blasting apparatus of claim 1, wherein: the water inlet of water pipeline is located interior frame, has the sealing washer between interior frame and the water pipeline.

6. The nozzle assembly of a pneumatic dental blasting apparatus of claim 1, wherein: the outer surface of the inner frame is provided with a first step, and the inner surface of the outer shell is provided with a second step matched with the first step; the second step is adjacent to the nozzle relative to the first step.

7. The nozzle assembly of the pneumatic dental blasting apparatus of claim 6, wherein: be equipped with the location floor in the shell, location floor and interior frame contact, the location floor has the distance with first step.

8. The nozzle assembly of the pneumatic dental blasting apparatus of claim 7, wherein: the location floor has a plurality ofly, and a plurality of location floors evenly set up along interior frame around.

9. The pneumatic dental blasting apparatus nozzle assembly of claim 8, wherein: the barrel body of the inner frame is cylindrical, and the contact surface of the positioning rib plate and the inner frame is arc-shaped.

10. The nozzle assembly of a pneumatic dental blasting apparatus of claim 1, wherein: one end of the shell is propped against the nozzle, and a limiting part for preventing the shell and the nozzle from rotating mutually is arranged between the combining surfaces of the shell and the nozzle.