Sand tank for regulating sand output under constant pressure

Abstract

The utility model relates to dental technology field, concretely relates to a sand tank of sand output under regulation of constant pressure, including jar body, lid, screw cap, sealing element, propelling rod, sand pipe, hopper, sand pipe, base, valve mounting piece, duckbill check valve, sand storage jar is connected with instrument in use, compressed gas enters jar body inner chamber, and sand powder is lifted, the compressed gas flow of air inlet can not have the influence of stirring to the sand powder of storage area outside the clearance because of the splay mouth of sand pipe bottom can be completely covered into the air inlet. And this splay mouth can expand the venturi effect. Thus sand powder flows down from the clearance and is not affected by the airflow of air inlet and produces a uniform sand inlet to flow into the mixing area with constant amount. At the same time, the screw cap is rotated, the sand pipe is moved upward, and the sand outlet gap will become larger, and a larger sand output can be obtained, thereby solving the problems of insufficient sand output regulation freedom and more sand powder residues at the bottom of the existing sand storage device.

Description

Technical Field

[0001] This utility model relates to the field of dental technology, and in particular to a sand jar that adjusts the sand output under constant pressure. Background Technology

[0002] Dental air polishing equipment uses compressed gas (usually air) to lift sand powder from a storage tank. The sand powder is then transported to the air polishing handle through an air outlet. The high-speed airflow impacts the tooth surface, thereby removing plaque, soft deposits, early tartar, tobacco stains, tea stains, and other substances from the supragingival and subgingival tooth surfaces.

[0003] Currently, most sand storage tanks adjust their sand output indirectly using variable pressure. This means that the output changes as the pressure of the injected compressed gas changes, but the output cannot be directly adjusted under constant pressure. Therefore, existing powder tanks on the market suffer from insufficient freedom in adjusting the output under constant pressure, making them unsuitable for treating complex conditions during sandblasting.

[0004] To address the issues of insufficient flexibility in adjusting the sand output of existing sand storage tanks and excessive sand residue at the bottom of the container, this invention provides a sand storage tank with a novel sand output adjustment method and a novel bottom structure. Utility Model Content

[0005] The purpose of this invention is to provide a sand tank that can adjust the sand output under constant pressure, in order to solve the problems of insufficient freedom in adjusting the sand output of existing sand storage devices and excessive sand powder residue at the bottom of the container.

[0006] To achieve the above objectives, this utility model provides a sand jar for adjusting the sand output under constant pressure, including a jar body, a lid, a spiral cap, a sealing element, a push rod, a sand inlet pipe, a funnel, a sand outlet pipe, a base, a valve mounting element, and a duckbill one-way valve. The sand inlet pipe has an eight-shaped opening area and a sand outlet.

[0007] The lid is installed on the tank body, and the lid and the screw cap are fixed with a shaft retainer; the funnel is installed inside the tank body, the seal is installed on the inner wall of the lid, an adjusting nut is placed in the square grid of the seal, the push rod passes through the central hole of the seal and is connected to the sand guide pipe shaft pin, the funnel is eccentrically assembled with the sand outlet pipe, the base is installed at the bottom of the tank body, the valve mounting part is installed on the base, and the duckbill one-way valve is installed on the valve mounting part.

[0008] The lower wall of the square groove of the seal and the inner wall of the cover form the movable space of the adjusting nut.

[0009] The adjusting nut has a spiral feature one, and the spiral cap has a spiral feature two, with the spiral feature one and the spiral feature two engaging.

[0010] The tank body, the side wall of the funnel, and the figure-eight opening area form a sand powder storage area; the inner wall of the sand guide pipe and the bottom of the funnel combine to form a mixing area, and the bottom of the mixing area has an air inlet.

[0011] The square sidewall of the adjusting nut engages with the square grid to restrict the rotation of the adjusting nut.

[0012] This invention relates to a sand container for adjusting sand output under constant pressure. During use, the sand container is connected to the instrument, and compressed gas enters the inner cavity of the container, agitating the sand powder. Because the V-shaped opening at the bottom of the sand inlet completely covers the air inlet, the compressed airflow at the inlet will not agitate the sand powder in the storage area outside the gap. Furthermore, this V-shaped opening amplifies the Venturi effect. Thus, the sand powder flows down from the gap without being affected by the airflow at the inlet, resulting in a uniform sand inlet and a constant flow into the mixing area. Therefore, a uniform sand output can be obtained under constant or varying pressure. Simultaneously, rotating the screw cap moves the sand inlet pipe upwards, increasing the sand outlet gap and resulting in a larger sand output. Conversely, reversing the screw cap decreases the sand outlet gap, resulting in a smaller sand output. This forms a device with uniform and adjustable sand output, thus solving the problems of insufficient freedom in adjusting the sand output and excessive sand powder residue at the bottom of existing sand containers. Attached Figure Description

[0013] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the accompanying drawings used in the description of the embodiments or the prior art will be briefly introduced below.

[0014] Figure 1 This is a schematic diagram of the structure of a sand jar that adjusts the sand output under constant pressure according to this utility model.

[0015] Figure 2 This is a cross-sectional view of a sand jar that adjusts the sand output under constant pressure according to this utility model.

[0016] Figure 3 and Figure 4 This is a schematic diagram showing different gap sizes.

[0017] Figure 5 This is a schematic diagram of the lower wall of the grid groove and the square grid.

[0018] Figure 6 This is a schematic diagram of the square sidewalls and the spiral feature.

[0019] Figure 7 This is a schematic diagram of spiral feature two.

[0020] In the diagram: 1-Screw cap, 2-Lid, 3-Adjusting nut, 4-Propeller rod, 5-Seal, 6-Tank body, 7-Sand siphon pipe, 8-Function funnel, 9-Sand outlet pipe, 10-Air inlet, A-Mixing zone, 11-Duckbill check valve, 12-Sealing ring, 13-Base, 14-Valve mounting component, 101-Screw feature two, 201-Lid inner wall, 301-Square side wall, 302-Screw feature one, 501-Lower wall of square groove, 502-Square grid, 601-Sand powder storage area, 701-Side wall of figure-eight opening, 702-Figure-eight opening area, 703-Inner wall of sand siphon pipe, 801-Side wall of funnel, 901-Sand outlet pipe opening, a-Gap. Detailed Implementation

[0021] The embodiments of this utility model are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain this utility model, and should not be construed as limiting this utility model.

[0022] Please see Figures 1-7 This utility model provides a sand jar for adjusting the sand output under constant pressure, including a jar body 6, a lid 2, a spiral cap 1, a sealing element 5, a push rod 4, a sand inlet pipe 7, a funnel 8, a sand outlet pipe 9, a base 13, a valve mounting element 14, and a duckbill one-way valve 11. The sand inlet pipe 7 has an eight-shaped opening area 702 and a sand outlet 901.

[0023] The cover 2 is installed on the tank body 6, and the cover 2 and the screw cap 1 are fixed with a shaft retainer; the funnel 8 is installed inside the tank body 6, the sealing element 5 is installed on the inner wall 201 of the cover 2, the adjusting nut 3 is placed in the square grid 502 of the sealing element 5, the push rod 4 passes through the central hole of the sealing element 5 and is connected to the sand guide pipe 7 with a shaft pin, the funnel 8 is eccentrically assembled with the sand outlet pipe 9, the base 13 is installed at the bottom of the tank body 6, the valve mounting part 14 is installed on the base 13, and the duckbill one-way valve 11 is installed on the valve mounting part 14.

[0024] The lower wall 501 of the square groove of the sealing element 5 and the inner wall 201 of the cover 2 form the movable space of the adjusting nut 3.

[0025] The adjusting nut 3 has a spiral feature 302, and the spiral cap 1 has a spiral feature 101. The spiral feature 302 and the spiral feature 101 are engaged.

[0026] The tank body 6, the side wall 801 of the funnel 8 and the figure-eight opening area 702 form a sand powder storage area 601; the inner wall 703 of the sand guide pipe 7 and the bottom of the funnel 8 combine to form a mixing area A, and the bottom of the mixing area A has an air inlet 10.

[0027] The square sidewall 301 of the adjusting nut 3 cooperates with the square grid 502 to restrict the rotation of the adjusting nut 3.

[0028] In this embodiment, when the sand storage device is working, the sand powder flows from the gap a formed between the side wall of the funnel 8 and the sand inlet pipe 7 to the bottom air inlet 10; thereby blowing the sand powder into the sand inlet pipe 7 and into the top of the inner cavity, realizing a constant airflow of sand powder, with no residual powder at the bottom; then the sand powder is discharged from the outlet of the air outlet pipe at the top of the inner cavity.

[0029] An "eight-shaped" opening is provided at the bottom of the sand inlet pipe 7, with a gap a between the side wall 701 of this opening and the side wall of the funnel 8. Furthermore, a mixing zone is formed within the space of the sand inlet pipe 7 and the lower side wall of the funnel 8, including the air inlet 10. Therefore, gap a is the channel through which powder flows into the air inlet 10 within the tank 6. The size of gap a determines the amount of powder flowing into the mixing zone. Thus, the amount of sand output is determined by gap a. The sand inlet pipe 7 is fixed to the push rod 4 at the top of the cover 2. The push rod 4 is then connected to the adjusting nut 3. The up-and-down movement is controlled by rotating the screw cap 1 at the top of the cover 2, causing the size of the "eight-shaped" side wall 701 and the side wall of the funnel 8 to change accordingly. When the adjusting rod is at its lowest position, rotating the knob moves the adjusting rod upwards, increasing gap a. Conversely, decreasing gap a. This provides an adjustable flow channel space with adjustable gap a, allowing for adjustment of the sand output within a certain range for the powder-air mixture.

[0030] When the operator performs sandblasting for dental cleaning, the sand storage tank is connected to the instrument. Compressed gas enters the inner cavity of the tank 6, raising the sand powder. Because the V-shaped opening at the bottom of the sand inlet pipe 7 completely covers the air inlet 10, the compressed airflow from the air inlet 10 will not agitate the sand powder in the storage area outside gap a. Furthermore, this V-shaped opening amplifies the Venturi effect. Thus, the sand powder flows down from gap a without being affected by the airflow from the air inlet 10, resulting in a uniform sand inlet that flows into the mixing area A at a constant rate. Therefore, a uniform sand output can be obtained under constant or varying pressure. Simultaneously, rotating the screw cap 1 moves the sand inlet pipe 7 upwards, increasing the sand outlet gap a and resulting in a larger sand output. Conversely, reversing the screw cap 1 decreases the sand outlet gap a, resulting in a smaller sand output. This creates a device with uniform and adjustable sand output, thus solving the problems of insufficient freedom in adjusting the sand output and excessive sand powder residue at the bottom of existing sand storage devices.

[0031] Example 1

[0032] The lower part of the sand-drawing pipe has a V-shaped opening, which can amplify the Venturi effect; and there is a gap between the circular V-shaped opening and the sloping wall of the circular funnel. For example... Figure 3 The gap allows sand powder to flow into the air inlet at a constant rate. The lower dimension of the V-shaped opening should be at least three times larger than the outlet dimension. The edge features completely cover the airflow area of ​​the air inlet; the sand powder flowing down the gap is unaffected by the airflow from the air inlet, resulting in a uniform sand inlet. Therefore, a uniform sand output can be obtained. The gap can be between 0.6 and 3.5 mm, with an optimal recommended gap between 1.2 and 3 mm.

[0033] The mixing zone is formed by the bottom sidewall of the funnel and the inner sidewall of the sand guide pipe, creating a turbulent airflow area. After entering the mixing zone through the gap, the sand powder is agitated and mixed by the compressed air from the inlet. It is then guided upwards through the small orifice inside the sand guide pipe and flows out from the top of the pipe.

[0034] Example 2

[0035] Initially, the sand outlet gap is small, obstructing some powder flow and resulting in a small sand output. When the rotating cap is turned, the double-helix feature of the cap causes the sand adjusting nut to rotate. However, the square groove of the seal restricts the sand adjusting nut to move upwards along this groove, thus moving the sand guide tube upwards. The sand outlet gap will then widen. This increases the amount of powder flowing into the mixing zone, resulting in a larger sand output (e.g., ...). Figure 3 , Figure 4 The double-helix feature of the screw cap uses a large pitch P=4.0mm, allowing the sand guide tube to shift 4.0mm with each rotation of the screw cap. This results in a wide range of adjustable sand discharge gaps. Therefore, the movement of the sand adjusting nut within the lower wall of the seal's inner groove and the inner wall of the cover adjusts the range of sand discharge.

[0036] The above-disclosed embodiments are merely one or more preferred embodiments of this application and should not be construed as limiting the scope of this application. Those skilled in the art can understand that all or part of the processes for implementing the above embodiments and equivalent changes made in accordance with the claims of this application still fall within the scope of this application.

Claims

1. A sand jar for adjusting sand output under constant pressure, characterized in that, It includes a tank body, a lid, a screw cap, a seal, a push rod, a sand-drawing pipe, a funnel, a sand-discharge pipe, a base, a valve mounting component, and a duckbill check valve. The sand-drawing pipe has an eight-shaped opening area and a sand-discharge port. The lid is mounted on the tank body, and the lid and the screw cap are fixed together using a shaft retainer. The funnel is mounted inside the tank body, the seal is mounted on the inner wall of the lid, and an adjusting nut is placed in the square grid of the seal. The push rod passes through the central hole of the seal and is connected to the sand-feeding pipe shaft pin. The funnel and the sand-discharging pipe are eccentrically assembled. The base is mounted on the bottom of the tank body, the valve mounting piece is mounted on the base, and the duckbill one-way valve is mounted on the valve mounting piece. The lower wall of the square groove of the seal and the inner wall of the cover form the movable space for the adjusting nut; The adjusting nut has a spiral feature one, and the spiral cap has a spiral feature two, with the spiral feature one and the spiral feature two engaging. The tank body, the side wall of the funnel, and the V-shaped opening area form a sand powder storage area; the inner wall of the sand guide pipe and the bottom of the funnel combine to form a mixing area, and the bottom of the mixing area has an air inlet; The square sidewall of the adjusting nut engages with the square grid to restrict the rotation of the adjusting nut.

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