Fluid connection / disconnection control structure and air-powder polishing apparatus

Abstract

Disclosed is a fluid connection / disconnection control structure. The fluid connection / disconnection control structure comprises: a sealing device (100) and a driving assembly (200), wherein a target through hole (010) is provided in the sealing device (100); the driving assembly (200) has a sealing portion, a piston through hole (020) is provided in the sealing portion, and at least one surface contact seal is formed between the sealing portion and the sealing device (100); and the driving assembly (200) is used for driving the sealing device and / or the sealing portion, such that the piston through hole (020) is connected to or disconnected from the target through hole (010). Neither the sealing device nor the sealing portion of the fluid connection / disconnection control structure is easily worn. Further disclosed is an air-powder polishing apparatus using the fluid connection / disconnection control structure.

Description

A fluid on / off control structure and a sandblasting dental cleaning device Technical Field

[0001] This application relates to the field of dental medical device technology, and in particular to a fluid on / off control structure and a sandblasting dental cleaning device. Background Technology

[0002] In dentistry, air polishing involves using compressed air to propel air polishing powder (the main components of which are usually sodium bicarbonate, glycine, or erythritol) onto the tooth surface. This powder, combined with a liquid medium (usually water), is used to impact plaque and tartar on the tooth surface with a certain amount of kinetic energy, thereby cleaning the tooth surface.

[0003] In practical applications, dental air blasting equipment consists of an air blasting unit and an air blasting gun, which are connected by pipes. After the dental air blasting unit stops, the air blasting gun will continue to blast because there is still a certain amount of air pressure inside, which is not conducive to rapid response control. Therefore, an on / off control structure needs to be arranged between the air blasting chamber (compressed air and air blasting mixing chamber) and the nozzle (fluid ejection component) to facilitate the rapid cut-off of air blasting.

[0004] In current applications, the on / off control structure between the sand powder chamber and the nozzle is a pinch valve. Its working principle involves a drive mechanism using thrust to press a lever against a flexible hose, compressing and deforming the hose to cut off the fluid inside. However, because the pinch valve controls on / off flow through compression, and the internal fluid contains sand particles that can rub against and cut the hose, the hose is prone to wear and leakage, resulting in poor airtightness and low reliability of the sandblasting dental cleaning equipment. Therefore, improving the airtightness of the fluid on / off control structure, as well as increasing its reliability and service life, has become an urgent problem to be solved. Summary of the Invention

[0005] This application discloses a fluid on / off control structure and a sandblasting dental cleaning device, which can improve the airtightness of the fluid on / off control structure to achieve rapid response and precise control of the sandblasting powder fluid, and has high reliability and long service life.

[0006] To achieve the above objectives, in a first aspect, this application discloses a fluid on / off control structure, the structure comprising:

[0007] A sealing device having a target through hole;

[0008] A drive assembly having a sealing portion having a piston through hole, and at least one surface contact seal between the sealing portion and the sealing device; the drive assembly is used to drive the sealing device and / or the sealing portion to move so that the piston through hole and the target through hole are connected or offset.

[0009] Secondly, this application discloses an air-blasting dental cleaning device, comprising:

[0010] Equipment body;

[0011] The fluid on / off control structure as described in the first aspect of this application is installed on the device body.

[0012] Compared with the prior art, the beneficial effects of this application are as follows:

[0013] The fluid on / off control structure provided in this application controls the movement of the sealing device and / or sealing part through the drive component, so that the target through hole on the sealing device and the sealing part are connected or disconnected. During this process, the sealing device and sealing part are not easily deformed by external force, that is, the sealing device and sealing part are not easily worn, thereby improving the airtightness of the fluid on / off control structure, and making it more reliable and longer in service life.

[0014] The fluid on / off control structure provided in this application adopts the above-mentioned fluid on / off control structure. By driving the component, the movement of the sealing device and / or the sealing part is controlled, so that the target through hole on the sealing device and the sealing part are connected or disconnected. During this process, the sealing device and the sealing part are not easily deformed by external force, that is, the sealing device and the sealing part are not easily worn, thereby improving the airtightness of the fluid on / off control structure and making it more reliable and longer in service life. Attached Figure Description

[0015] Figure 1 is a schematic diagram of the fluid on / off control structure of this application;

[0016] Figure 2 is a schematic diagram of the first embodiment of the fluid on / off control structure in this application;

[0017] Figure 3 is a schematic diagram of a specific embodiment of the fluid on / off control structure in this application;

[0018] Figure 4 is a schematic diagram of the first pre-compression member and the first sealing member of the fluid on / off control structure in this application;

[0019] Figure 5 is a structural schematic diagram of the second pre-compression member and the second sealing member of the fluid on / off control structure in this application;

[0020] Figure 6 is a cross-sectional structural schematic diagram of a specific embodiment of the fluid on / off control structure in this application;

[0021] Figure 7 is a schematic diagram of the structure of the fluid on / off control structure of this application with the target receiving tank configured;

[0022] Figure 8 is a schematic diagram of a specific embodiment of the fluid on / off control structure of this application, in which a first receiving groove and a second receiving groove are configured.

[0023] Figure 9 is a front view of the first base and the first seal in the fluid on / off control structure of this application;

[0024] Figure 10 is a front view of the second base and the second seal in the fluid on / off control structure of this application;

[0025] Figure 11 is a schematic diagram of the structure of the fluid on / off control structure of this application with the target powder discharge port configured;

[0026] Figure 12 is a schematic diagram of the outer shell, the first flow guide joint and the second flow guide joint of the fluid on / off control structure of this application;

[0027] Figure 13 is a schematic diagram of the structure of the first base in the fluid on / off control structure of this application;

[0028] Figure 14 is a schematic diagram of the second base in the fluid on / off control structure of this application;

[0029] Figure 15 is a cross-sectional structural schematic diagram of a specific embodiment of the fluid on / off control structure of this application, in which a first sealing ring and a second sealing ring are configured.

[0030] Figure 16 is a side view of a specific embodiment of the fluid on / off control structure in this application;

[0031] Figure 17 is a schematic diagram of the buffer component configured in the fluid on / off control structure of this application;

[0032] Figure 18 is a schematic diagram of the structure of the piston rod base, piston rod body, sealing plate and spring spring in the fluid on / off control structure of this application;

[0033] Figure 19 is a cross-sectional structural schematic diagram of a first specific embodiment of the fluid on / off control structure of this application with a buffer component configured in the fluid on / off control structure.

[0034] Figure 20 is a cross-sectional structural schematic diagram of a second specific embodiment of the fluid on / off control structure of this application, in which a buffer component is configured.

[0035] Figure 21 is a cross-sectional view of a third specific embodiment of the fluid on / off control structure of this application, which includes a buffer component.

[0036] Figure 22 is a cross-sectional structural schematic diagram of a specific embodiment of the fluid on / off control structure of this application, which is driven by an electromagnet.

[0037] Figure 23 is a schematic diagram of the fluid on / off control structure of this application with a quick-connect base configured;

[0038] Figure 24 is a structural schematic diagram of the connection end of the quick-connect base and the connection end of the cylinder body in the fluid on / off control structure of this application.

[0039] Figure 25 is a schematic diagram of the quick-connect base in the fluid on / off control structure of this application;

[0040] Figure 26 is a schematic diagram of the cylinder block in the fluid on / off control structure of this application;

[0041] Figure 27 is a front view of a specific embodiment of the fluid on / off control structure in this application;

[0042] Figure 28 is a schematic diagram of the second embodiment of the fluid on / off control structure in this application;

[0043] Figure 29 is a schematic diagram of the third embodiment of the fluid on / off control structure of this application.

[0044] The meanings of the reference numerals in the attached drawings are as follows: Target through hole 010, First through hole 011, Second through hole 012, Piston through hole 020, Target storage groove 030, First storage groove 031. First sub-storage slot 0311, second sub-storage slot 0312, second storage slot 032, third sub-storage slot 0321, fourth sub-storage slot 0322, target powder discharge port 040, first powder discharge port 041, first powder discharge slot 0411, second powder discharge slot 0412, second powder discharge port 042, third powder discharge slot 0421, fourth powder discharge slot 0422, piston cavity 050, first piston groove 051, second piston groove 052, third through hole 061, fourth through hole 062, first fixing groove 071, second fixing groove 072, first powder cleaning port 081, second powder cleaning port 082, vent 083, air guide port 084, first connecting part 085, second connecting part 086, base connecting hole 087, first connecting hole 0871, second connecting hole 0872, cylinder connecting hole 088, third connecting hole 0881, Fourth connecting hole; 0882, Sealing device 100, First sealing assembly 110, First pre-tightening component 111, First sealing component 112, Second sealing assembly 120, Second pre-tightening component 121, Second sealing component 122, Drive assembly 200, Cylinder body 210, Plug rod body 220, Plug rod base 221, Plug rod body 222, Sealing plate 223, First spring-loaded component 230, Cylinder body 240, Second spring-loaded component 250, Electromagnet 260, Outer shell 300, First base 310, Second base 320, First flow guide connector 401, Second flow guide connector 402, First sealing ring 501, Second sealing ring 502, Sealing rubber ring 503, Buffer assembly 600, First buffer component 610, Second buffer component 620, Third buffer component 630, Fourth buffer component 640, Quick-connect base 700. Detailed Implementation

[0045] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0046] In this application, the terms "upper," "lower," "left," "right," "front," "rear," "top," "bottom," "inner," "outer," "middle," "vertical," "horizontal," "lateral," and "longitudinal" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. These terms are primarily for the purpose of better describing this application and its embodiments, and are not intended to limit the indicated device, element, or component to having a specific orientation, or to be constructed and operated in a specific orientation.

[0047] Furthermore, in addition to indicating location or positional relationship, some of the aforementioned terms may also have other meanings. For example, the term "above" may also be used in some cases to indicate a certain dependency or connection relationship. Those skilled in the art can understand the specific meaning of these terms in this application based on the specific circumstances.

[0048] Furthermore, the terms "installation," "setup," "equipped with," "connection," and "linked" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral structure; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium, or an internal connection between two devices, components, or parts. Those skilled in the art can understand the specific meaning of these terms in this application based on the specific circumstances.

[0049] Furthermore, the terms "first," "second," etc., are primarily used to distinguish different devices, elements, or components (which may be the same or different in specific type and construction), and are not intended to indicate or imply the relative importance or quantity of the indicated devices, elements, or components. Unless otherwise stated, "a plurality of" means two or more.

[0050] The technical solution of this application will be further described below with reference to the embodiments and accompanying drawings.

[0051] In dentistry, air polishing involves using compressed air to propel air polishing powder (the main components of which are usually sodium bicarbonate, glycine, or erythritol) onto the tooth surface. This powder, combined with a liquid medium (usually water), is used to impact plaque and tartar on the tooth surface with a certain amount of kinetic energy, thereby cleaning the tooth surface.

[0052] In practical applications, dental air blasting equipment consists of an air blasting unit and an air blasting gun, which are connected by pipes. After the dental air blasting unit stops, the air blasting gun will continue to blast because there is still a certain amount of air pressure inside, which is not conducive to rapid response control. Therefore, an on / off control structure needs to be arranged between the air blasting chamber (compressed air and air blasting mixing chamber) and the nozzle (fluid ejection component) to facilitate the rapid cut-off of air blasting.

[0053] In current applications, the on / off control structure between the sand powder chamber and the nozzle is a pinch valve. Its working principle involves a drive mechanism using thrust to press a lever against a flexible hose, compressing and deforming the hose to cut off the fluid inside. However, because the pinch valve controls on / off flow through compression, and the internal fluid contains sand particles that can rub against and cut the hose, the hose is prone to wear and leakage, resulting in poor airtightness and low reliability of the sandblasting dental cleaning equipment. Therefore, improving the airtightness of the fluid on / off control structure, as well as increasing its reliability and service life, has become an urgent problem to be solved.

[0054] In response, this application discloses a fluid on / off control structure and a sandblasting dental cleaning device, which can improve the airtightness of the fluid on / off control structure to achieve rapid response and precise control of the sandblasting powder fluid, and has high reliability and long service life.

[0055] As shown in Figure 1, this application discloses a fluid flow control structure, which includes a sealing device 100 and a drive assembly 200. The sealing device 100 has a target through hole 010; the drive assembly 200 has a sealing part, and a piston through hole 020 is provided on the sealing part. The sealing part and the sealing device 100 have at least one surface contact seal; the drive assembly 200 is used to drive the sealing device 100 and / or the sealing part to connect or offset the piston through hole 020 and the target through hole 010.

[0056] In this embodiment, referring to FIG1, the sealing device 100 has a target through hole 010, and the sealing part of the driving assembly 200 has a piston through hole 020. The driving assembly 200 can drive its sealing part and / or sealing device 100, so that the sealing part and sealing device 100 move relative to each other in the vertical direction, thereby connecting or misaligning the piston through hole 020 with the target through hole 010. When the piston through hole 020 is aligned with the target through hole 010, the sand powder fluid can flow through the target through hole 010 and the piston through hole 020; when the piston through hole 020 is misaligned with the target through hole 010, the sealing part can block the flow of the sand powder fluid.

[0057] As can be seen, the fluid on / off control structure of this application can control the movement of the sealing device 100 and / or the sealing part through the drive component 200, so that the target through hole 010 on the sealing device 100 is connected or disconnected from the piston through hole 020 on the sealing part. During this process, the sealing device 100 and the sealing part are not easily deformed due to external force, that is, the sealing device 100 and the sealing part are not easily worn, thereby improving the airtightness of the fluid on / off control structure, and making it more reliable and longer in service life.

[0058] As shown in Figure 2, in an optional embodiment, the target through hole 010 includes: a first through hole 011 and a second through hole 012; wherein, the driving assembly 200 is used to drive the sealing device 100 and / or the sealing part so that the piston through hole 020 is connected or offset between the first through hole 011 and the second through hole 012.

[0059] In this embodiment, referring to FIG2, the sealing device 100 has a first through hole 011 on the left and a second through hole 012 on the right in the left-right horizontal direction. The sealing part of the driving assembly 200 is provided with a piston through hole 020. The sealing part is disposed between the two through holes on the sealing device 100. The driving assembly 200 can drive its sealing part and / or sealing device 100, so that the sealing part and sealing device 100 move relative to each other in the vertical direction, thereby connecting or offsetting the piston through hole 020 between the first through hole 011 and the second through hole 012. When the piston through hole 020 is aligned and connected with the first through hole 011 and the second through hole 012 respectively, the sand powder fluid can flow through the first through hole 011, the piston through hole 020 and the second through hole 012; when the piston through hole 020 is offset from the first through hole 011 and the second through hole 012, the sealing part can block the connection between the first through hole 011 and the second through hole 012, thereby blocking the flow of sand powder fluid.

[0060] As can be seen, this optional embodiment can also control the movement of the sealing device 100 and / or the sealing part through the drive component 200, so that the first through hole 011 and the second through hole 012 on the sealing device 100 are connected or disconnected. During this process, the sealing device 100 and the sealing part are not easily deformed due to external force, that is, the sealing device 100 and the sealing part are not easily worn, thereby improving the airtightness of the fluid flow control structure.

[0061] As shown in Figure 3, in an optional embodiment, the fluid on / off control structure further includes a housing 300, which has a piston cavity 050; the sealing device 100 includes: a first sealing assembly 110 and a second sealing assembly 120, the first sealing assembly 110 being disposed on a first inner surface of the piston cavity 050, the first sealing assembly 110 having a pre-tightening portion, the pre-tightening portion of the first sealing assembly 110 applying a pre-tightening force to the sealing surface of the first sealing assembly 110, and the first sealing assembly 110 having a first through hole 011; the second sealing assembly 120 being disposed on a second inner surface of the piston cavity 050, the second sealing assembly 120 having a pre-tightening portion, the pre-tightening portion of the second sealing assembly 120 applying a pre-tightening force to the sealing surface of the second sealing assembly 110, and the first sealing assembly 120 having a first through hole 011; the second sealing assembly 120 being disposed on a second inner surface of the piston cavity 050, the second sealing assembly 120 having a pre-tightening portion, the pre-tightening portion of the second sealing assembly 120 applying a pre-tightening force to the sealing surface of the second sealing assembly 110, and the second ... A pre-tightening force is applied to the sealing surface of the second sealing assembly 120, which has a second through hole 012. The first inner surface and the second inner surface are two inner surfaces opposite to the piston cavity 050. The sealing surfaces of the first sealing assembly 110 and the second sealing assembly 120 are arranged opposite to each other, and the first through hole 011 and the second through hole 012 are arranged opposite to each other. The sealing part of the drive assembly 200 contacts the sealing surfaces of the first sealing assembly 110 and the second sealing assembly 120 respectively. The sealing part of the drive assembly 200 is used to move in the piston cavity 050 so that the first through hole 011 and the second through hole 012 communicate through the piston through hole 020, or so that the sealing part blocks the communication between the first through hole 011 and the second through hole 012.

[0062] In this optional embodiment, referring to FIG3, the outer casing 300 has a vertically oriented piston cavity 050, the upper and lower ends of which are connected to the outside of the outer casing 300. The left and right inner walls of the outer casing 300 are respectively the first inner surface and the second inner surface of the piston cavity 050, that is, the first inner surface and the second inner surface of the piston cavity 050 are two opposing inner surfaces of the piston cavity 050.

[0063] The first sealing assembly 110 is disposed on the first inner surface of the piston cavity 050. The pre-tightening portion of the first sealing assembly 110 is located on the left side of the first sealing assembly 110, and the sealing surface of the first sealing assembly 110 is the right side surface of the first sealing assembly 110. The second sealing assembly 120 is disposed on the second inner surface of the piston cavity 050. The pre-tightening portion of the second sealing assembly 120 is located on the right side of the second sealing assembly 120, and the sealing surface of the second sealing assembly 120 is the left side surface of the second sealing assembly 120. The first through hole 011 of the first sealing assembly 110 and the second through hole 012 of the second sealing assembly 120 are correspondingly arranged to each other in the left-right lateral direction.

[0064] In some embodiments, the sealing portion of the drive assembly 200 has a piston through-hole 020 arranged laterally. The internal shape of the piston cavity 050 is determined by the shape of the sealing portion; that is, the internal shape of the piston cavity 050 needs to conform to the shape of the sealing portion so that the sealing portion can move up and down in the piston cavity 050, and during the movement, the sealing portion can contact the sealing surfaces of the first sealing assembly 110 and the second sealing assembly 120 respectively. When the sealing portion of the drive assembly 200 moves up and down in the piston cavity 050, if the piston through-hole 020 on the sealing portion is aligned and connected with the first through-hole 011 and the second through-hole 012, then the first through-hole 011 and the second through-hole 012 can communicate through the piston through-hole 020, and fluid can flow through the first through-hole 011, the piston through-hole 020, and the second through-hole 012. If the piston through-hole 020 on the sealing portion is not aligned with the first through-hole 011 and the second through-hole 012, then the sealing portion can block the communication between the first through-hole 011 and the second through-hole 012.

[0065] In some embodiments, the first sealing assembly 110, by its pre-compression portion facing the first inner surface of the piston cavity 050, allows its sealing surface to be subjected to a rightward pre-compression force. Simultaneously, the second sealing assembly 120, by its pre-compression portion facing the second inner surface of the piston cavity 050, allows its sealing surface to be subjected to a leftward pre-compression force. Since the sealing portions of the drive assembly 200 can contact the sealing surfaces of the first sealing assembly 110 and the second sealing assembly 120 respectively, the first and second sealing assemblies 110 and 120 can apply pressure to the sealing portion of the intermediate drive assembly 200. In summary, regardless of whether the drive assembly 200 is in motion, the first and second sealing assemblies 110 and 120 can be pre-compressed onto the sealing portion of the drive assembly 200, enabling a seal between the first and second sealing assemblies 110 and the sealing portion, thereby improving the airtightness of the fluid flow control structure.

[0066] As can be seen, this optional embodiment can also use the pre-tightening part of the first sealing component 110 and the second sealing component 120 to apply pressure to the sealing part, so that the first sealing component 110 and the second sealing component 120 can respectively seal with the sealing part, thereby improving the airtightness of the fluid flow control structure and ensuring precise control of the start and stop of sandblasting powder spraying.

[0067] As shown in Figure 4, in an optional embodiment, the first sealing assembly 110 includes a first pre-compression member 111 and a first sealing member 112. The first pre-compression member 111 is disposed on the first inner surface of the piston cavity 050 and has a first sub-through hole; the first sealing member 112 is disposed on the side of the first pre-compression member 111 away from the first inner surface of the piston cavity 050 and has a second sub-through hole; wherein the first sub-through hole and the second sub-through hole are disposed opposite to each other and communicate with each other to form a first through hole 011, the sealing surface of the first sealing assembly 110 is the sealing surface of the first sealing member 112, and the sealing surface of the first sealing member 112 is the side of the first sealing member 112 away from the first pre-compression member 111.

[0068] In this optional embodiment, referring to Figures 3 and 4, a first pre-compression member 111 and a first sealing member 112 are sequentially provided on the first inner surface of the piston cavity 050. The first pre-compression member 111 has an expansion potential energy toward the first sealing member 112 under the constraint of the first inner surface, so that the first sealing member 112 can be subjected to a pre-compression force from the first pre-compression member 111, thereby enabling the first sealing member 112 to apply pressure to the sealing part of the drive assembly 200, thereby enabling a seal to be achieved between the first sealing member 112 and the sealing part.

[0069] In some embodiments, the first sub-through hole of the first pre-tightening member 111 and the second sub-through hole of the first sealing member 112 are correspondingly arranged and interconnected, and the interconnected first sub-through hole and second sub-through hole are the aforementioned first through hole 011. The sealing surface of the first sealing member 112 is located on the right side of the first sealing member 112, and the first sealing member 112 contacts the sealing portion of the drive assembly 200 through its sealing surface.

[0070] As can be seen, this optional embodiment can also apply a pre-tightening force to the first seal 112 through the first pre-tightening member 111, so that the first seal 112 can apply pressure to the sealing part of the drive assembly 200, thereby achieving a seal between the first seal 112 and the sealing part, thereby improving the airtightness of the fluid flow control structure.

[0071] As shown in Figure 5, in an optional embodiment, the second sealing assembly 120 includes a second pre-compression member 121 and a second sealing member 122. The second pre-compression member 121 is disposed on the second inner surface of the piston cavity 050 and has a third sub-through hole; the second sealing member 122 is disposed on the side of the second pre-compression member 121 away from the second inner surface of the piston cavity 050 and has a fourth sub-through hole; wherein the third sub-through hole and the fourth sub-through hole are disposed opposite to each other and communicate to form a second through hole 012, and the sealing surface of the second sealing member 122 is the side of the second sealing member 122 away from the second pre-compression member 121, and the sealing surface of the second sealing member 122 is disposed opposite to the sealing surface of the first sealing member 112.

[0072] In this optional embodiment, referring to Figures 2 and 5, a second pre-compression member 121 and a second sealing member 122 are sequentially provided on the second inner surface of the piston cavity 050. The second pre-compression member 121, constrained by the second inner surface, has an expansion potential energy toward the second sealing member 122, allowing the second sealing member 122 to receive a pre-compression force from the second pre-compression member 121. This enables the second sealing member 122 to apply pressure to the sealing portion of the drive assembly 200, thereby achieving a seal between the second sealing member 122 and the sealing portion.

[0073] In some embodiments, the third sub-through hole of the second pre-tightening member 121 and the fourth sub-through hole of the second sealing member 122 are correspondingly arranged and interconnected, and the interconnected third and fourth sub-through holes are the aforementioned second through hole 012. The sealing surface of the second sealing member 122 is located on the left side of the second sealing member 122, that is, the sealing surface of the second sealing member 122 is opposite to the sealing surface of the first sealing member 112, and the second sealing member 122 contacts the sealing part of the drive assembly 200 through its sealing surface.

[0074] As can be seen, this optional embodiment can also apply a pre-tightening force to the second seal 122 through the second pre-tightening member 121, so that the second seal 122 can apply pressure to the sealing part of the drive assembly 200, thereby achieving a seal between the second seal 122 and the sealing part, thereby improving the airtightness of the fluid flow control structure.

[0075] In an optional embodiment, the materials of the first pre-compression member 111 and the second pre-compression member 121 are soft materials or elastic materials, respectively.

[0076] In this optional embodiment, referring to FIG6, both the first pre-compression member 111 and the second pre-compression member 121 can be selected as hollow annular gaskets made of soft or elastic materials. The hollow portion in the middle of the annular gasket is the first sub-through hole of the first pre-compression member 111 or the second pre-compression member 121 having a third sub-through hole. Since soft or elastic materials have expansion potential energy under compression, the pre-compression force on the first seal 112 or the second seal 122 can be increased, thereby increasing the pressure applied to the sealing portion of the drive assembly 200 and ensuring the sealing performance between the first seal 112 and the second seal 122 and the sealing portion.

[0077] As can be seen, this optional embodiment can also improve the airtightness of the fluid flow control structure by using soft or elastic materials as the constituent materials of the first pre-clamping member 111 and the second pre-clamping member 121.

[0078] As shown in Figures 6, 13 and 14, in an optional embodiment, a first fixing groove 071 is provided on the first inner surface of the piston cavity 050, and a second fixing groove 072 is provided on the second inner surface of the piston cavity 050; wherein, the first sealing component 110 is disposed in the first fixing groove 071, and the second sealing component 120 is disposed in the second fixing groove 072.

[0079] In this optional embodiment, a first fixing groove 071 is provided on the first inner surface, and a second fixing groove 072 is provided on the second inner surface. The first sealing component 110 is disposed in the first fixing groove 071 on the first inner surface, that is, the first fixing groove 071 can fix the first sealing component 110; the second sealing component 120 is disposed in the second fixing groove 072 on the second inner surface, that is, the second fixing groove 072 can fix the second sealing component 120.

[0080] As can be seen, this optional embodiment can also fix the first sealing component 110 through the first fixing groove 071 on the first inner surface and fix the second sealing component 120 through the second fixing groove 072 on the second inner surface, so that the first sealing component 110 and the second sealing component 120 will not detach due to being limited when the sealing part of the drive component 200 moves up and down, thereby ensuring the reliability of the fluid flow control structure for fluid flow control.

[0081] As shown in Figure 7, in an optional embodiment, a target collection groove 030 is provided on the inner wall of the piston cavity 050 of the outer shell 300. The first through hole 011 and the second through hole 012 are respectively connected to the external sandblasting guide pipe. The sandblasting guide pipe is used to transport sand powder fluid, and the target collection groove 030 is used to collect the residual powder of the sand powder fluid in the piston cavity 050.

[0082] In this optional embodiment, the first through hole 011 of the first sealing assembly 110 and the second through hole 012 of the second sealing assembly 120 are both connected to an external sandblasting guide pipe. The sandblasting guide pipe can transport the sand powder fluid to be used for sandblasting dental cleaning. The sandblasting guide pipe is divided into a front section and a rear section. The front section can transport the sand powder fluid to the fluid on / off control structure, and the rear section can transport the sand powder fluid to the nozzle of the sandblasting dental cleaning device. The front and rear sections of the sandblasting guide pipe are each connected to the corresponding through hole. It can be understood that the flow direction of the sand powder fluid in the fluid on / off control structure depends on how the front and rear sections of the sandblasting guide pipe are connected to the first through hole 011 and the second through hole 012. The connection method of the first through hole 011 and the second through hole 012 to the front and rear sections of the sandblasting guide pipe can be adaptively set according to the actual required sand powder fluid flow direction.

[0083] A target collection groove 030 is provided on the inner wall of the piston cavity 050 of the outer casing 300. The target collection groove 030 is connected to the piston cavity 050. When the sealing part of the drive assembly 200 moves up and down in the piston cavity 050, it can push the residual powder of the sand and powder fluid between the sealing part and the inner wall of the piston cavity 050 into the target collection groove 030. That is, the target collection groove 030 can collect the residual powder of the sand and powder fluid, thereby reducing the friction between the sealing part of the drive assembly 200 and the sealing surfaces of the first sealing assembly 110 and the second sealing assembly 120, thereby reducing the influence of the sand and powder fluid powder on the movement of the sealing part of the drive assembly 200 in the piston cavity 050, and thus improving the accuracy of controlling the flow of sand and powder fluid.

[0084] As can be seen, this optional embodiment can also provide a target collection groove 030 on the inner wall of the piston cavity 050, so that when the sealing part of the drive assembly 200 moves radially in the piston cavity 050, it can squeeze the residual powder of the sand and powder fluid between the sealing part and the sealing surfaces of the first sealing assembly 110 and the second sealing assembly 120 into the target collection groove 030. That is, the residual powder of the sand and powder fluid is collected by the target collection groove 030, thereby reducing the influence of the sand and powder fluid powder on the movement of the sealing part of the drive assembly 200 in the piston cavity 050, thereby improving the accuracy of controlling the on and off of the sand and powder fluid.

[0085] As shown in Figure 8, in an optional embodiment, the target storage groove 030 includes a first storage groove 031 and a second storage groove 032; the first storage groove 031 is provided on the first inner surface of the piston cavity 050, and the second storage groove 032 is provided on the second inner surface of the piston cavity 050; the first storage groove 031 is connected to the first fixing groove 071, and the second storage groove 032 is connected to the second fixing groove 072; both the first storage groove 031 and the second storage groove 032 are used to collect residual powder of the sand and powder fluid in the piston cavity 050.

[0086] In this optional embodiment, a first storage groove 031 is provided on the first inner surface, and a second storage groove 032 is provided on the second inner surface. The first storage groove 031 is connected to a first fixing groove 071 on the first inner surface, and the second storage groove 032 is connected to a second fixing groove 072 on the second inner surface.

[0087] When the sealing part of the drive assembly 200 moves up and down in the piston cavity 050, it can push the residual powder of the sand and powder fluid between the sealing part and the first sealing assembly 110 into the first receiving groove 031, and push the residual powder of the sand and powder fluid between the sealing part and the second sealing assembly 120 into the second receiving groove 032. This reduces the friction between the sealing part of the drive assembly 200 and the sealing surfaces of the first sealing assembly 110 and the second sealing assembly 120, thereby reducing the influence of the sand and powder fluid powder on the movement of the sealing part of the drive assembly 200 in the piston cavity 050.

[0088] As can be seen, this optional embodiment can also collect residual powder of sand and powder fluid through the first collection groove 031 and the second collection groove 032, thereby reducing the friction between the sealing part of the drive assembly 200 and the sealing surfaces of the first sealing assembly 110 and the second sealing assembly 120, thereby reducing the influence of the powder of sand and powder fluid on the movement of the sealing part of the drive assembly 200 in the piston cavity 050, and thus improving the accuracy of controlling the on and off of sand and powder fluid.

[0089] As shown in Figure 9, in an optional embodiment, the first storage groove 031 includes a first sub-storage groove 0311 and a second sub-storage groove 0312. The first sub-storage groove 0311 is disposed at the first end of the first fixing groove 071, and the second sub-storage groove 0312 is disposed at the second end of the first fixing groove 071. The first end and the second end of the first fixing groove 071 are opposite ends of the first fixing groove 071 in the radial direction of the piston cavity 050.

[0090] In this optional embodiment, referring to Figure 9, the upper end of the first fixing groove 071 is provided with a first sub-storage groove 0311, and the lower end of the first fixing end is provided with a second sub-storage groove 0312. Both the first sub-storage groove 0311 and the second sub-storage groove 0312 are connected to the first fixing groove 071. It can be understood that the size and shape of the first sub-storage groove 0311 and the second sub-storage groove 0312 can be configured according to the actual needs of storing residual powder. As shown in Figure 9, both the first sub-storage groove 0311 and the second sub-storage groove 0312 can be horizontally arranged elliptical grooves.

[0091] When the first seal 112 is disposed in the first fixing groove 071, the upper first sub-receiving groove 0311 is divided into a left groove and a right groove, and the lower second sub-receiving groove 0312 is also divided into a left groove and a right groove. When the sealing part of the drive assembly 200 moves upward relative to the outer shell 300 in the piston cavity 050, it can push the residual powder of the sand and powder fluid between the sealing part and the first inner surface of the piston cavity 050 into the upper first sub-receiving groove 0311; when the sealing part of the drive assembly 200 moves downward relative to the outer shell 300 in the piston cavity 050, it can push the residual powder of the sand and powder fluid between the sealing part and the first inner surface of the piston cavity 050 into the lower second sub-receiving groove 0312.

[0092] Meanwhile, by setting the first sub-storage groove 0311 and the second sub-storage groove 0312, the contact area between the first sealing member 112 and the inner wall of the first fixing groove 071 is reduced, thereby reducing the friction between the first sealing member 112 and the inner wall of the first fixing groove 071, so that the first sealing member 112 can move smoothly in the radial direction of the first fixing groove 071, which facilitates the disassembly, maintenance and upkeep of the first sealing member 112.

[0093] As can be seen, this optional embodiment can also collect residual powder of the sand and powder fluid between the sealing part and the first sealing member 112 through the first sub-collecting groove 0311 and the second sub-collecting groove 0312, thereby reducing the influence of the sand and powder fluid powder on the movement of the sealing part of the drive assembly 200 in the piston cavity 050, and thus improving the accuracy of controlling the on and off of the sand and powder fluid. At the same time, by setting the first sub-collecting groove 0311 and the second sub-collecting groove 0312, the friction between the first sealing member 112 and the inner wall of the first fixing groove 071 can also be reduced, so that the first sealing member 112 can move smoothly in the radial direction of the first fixing groove 071, and facilitate the disassembly, maintenance and upkeep of the first sealing member 112.

[0094] As shown in Figure 10, in an optional embodiment, the second storage groove 032 includes a third sub-storage groove 0321 and a fourth sub-storage groove 0322. The third sub-storage groove 0321 is disposed at the first end of the second fixing groove 072, and the fourth sub-storage groove 0322 is disposed at the second end of the second fixing groove 072. The first end and the second end of the second fixing groove 072 are opposite ends of the second fixing groove 072 in the radial direction of the piston cavity 050.

[0095] In this optional embodiment, referring to FIG10, a third sub-storage groove 0321 is provided at the upper end of the second fixing groove 072, and a fourth sub-storage groove 0322 is provided at the lower end of the second fixing end. Both the third sub-storage groove 0321 and the fourth sub-storage groove 0322 are connected to the second fixing groove 072. It can be understood that the size and shape of the third sub-storage groove 0321 and the fourth sub-storage groove 0322 can be configured according to the actual needs of storing residual powder. For example, as shown in FIG10, both the third sub-storage groove 0321 and the fourth sub-storage groove 0322 can be horizontally arranged elliptical grooves.

[0096] When the second seal 122 is disposed in the second fixing groove 072, the upper third sub-receiving groove 0321 is divided into a left groove and a right groove, and the lower fourth sub-receiving groove 0322 is also divided into a left groove and a right groove. When the sealing part of the drive assembly 200 moves upward relative to the outer shell 300 in the piston cavity 050, it can push the residual powder of the sand and powder fluid between the sealing part and the second inner surface of the piston cavity 050 into the upper third sub-receiving groove 0321; when the sealing part of the drive assembly 200 moves downward relative to the outer shell 300 in the piston cavity 050, it can push the residual powder of the sand and powder fluid between the sealing part and the second inner surface of the piston cavity 050 into the lower fourth sub-receiving groove 0322.

[0097] Meanwhile, by setting the third sub-storage groove 0321 and the fourth sub-storage groove 0322, the contact area between the second sealing member 122 and the inner wall of the second fixing groove 072 is reduced, thereby reducing the friction between the second sealing member 122 and the inner wall of the second fixing groove 072, so that the second sealing member 122 can move smoothly in the radial direction of the second fixing groove 072, which facilitates the disassembly, maintenance and upkeep of the second sealing member 122.

[0098] As can be seen, this optional embodiment can also collect residual powder of the sand and powder fluid between the sealing part and the second sealing member 122 through the third sub-collecting groove 0321 and the fourth sub-collecting groove 0322, thereby reducing the influence of the sand and powder fluid powder on the movement of the sealing part of the drive assembly 200 in the piston cavity 050, and thus improving the accuracy of controlling the on / off of the sand and powder fluid. At the same time, by setting the third sub-collecting groove 0321 and the fourth sub-collecting groove 0322, the friction between the second sealing member 122 and the inner wall of the second fixing groove 072 can also be reduced, so that the second sealing member 122 can move smoothly in the radial direction of the second fixing groove 072, and facilitate the disassembly, maintenance and upkeep of the second sealing member 122.

[0099] As shown in Figure 11, in an optional embodiment, the outer shell 300 is provided with a target powder discharge port 040 in the radial direction of the piston cavity 050. The target powder discharge port 040 communicates with the piston cavity 050 and is used to provide a discharge channel for the residual powder of the sand and powder fluid in the piston cavity 050 to be discharged to the outside of the outer shell 300.

[0100] In this optional embodiment, referring to FIG11, the outer casing 300 has a target powder discharge port 040 longitudinally formed on its outer wall, which communicates with the piston cavity 050. Since the sealing part of the drive assembly 200 moves vertically within the piston cavity 050, and the target powder discharge port 040 is formed along the movement trajectory of the sealing part, when the sealing part of the drive assembly 200 moves within the piston cavity 050, it can squeeze the residual powder of the sand and powder fluid between the sealing part and the inner wall of the piston cavity 050 into the target powder discharge port 040. That is, the residual powder of the sand and powder fluid can be discharged from the piston cavity 050 through the target powder discharge port 040, thereby reducing the influence of the sand and powder fluid powder on the movement of the sealing part of the drive assembly 200 within the piston cavity 050, preventing the sealing part of the drive assembly 200 from getting stuck in the piston cavity 050, and thus improving the reliability of the fluid flow control structure.

[0101] As can be seen, this optional embodiment can also discharge residual powder of the sand and powder fluid between the sealing part and the inner wall of the piston cavity 050 through the target powder discharge port 040 by opening a target powder discharge port 040 in the radial direction of the outer shell 300 along the piston cavity 050. This reduces the influence of the powder of the sand and powder fluid on the movement of the sealing part of the drive assembly 200 in the piston cavity 050, thereby improving the reliability of the fluid flow interruption structure.

[0102] As shown in Figure 12, in an optional embodiment, the target powder discharge port 040 includes a first powder discharge port 041 and a second powder discharge port 042; the outer shell 300 is provided with the first powder discharge port 041 and the second powder discharge port 042 in the radial direction of the piston cavity 050. The first powder discharge port 041 and the second powder discharge port 042 are arranged opposite to each other. Both the first powder discharge port 041 and the second powder discharge port 042 are connected to the piston cavity 050. Both the first powder discharge port 041 and the second powder discharge port 042 are used to discharge the residual powder of the sand and powder fluid in the piston cavity 050 to the outside of the outer shell 300.

[0103] In this optional embodiment, referring to FIG12, the outer shell 300 has a first powder discharge port 041 and a second powder discharge port 042 longitudinally opened on the upper and lower sides of its outer wall. The first powder discharge port 041 and the second powder discharge port 042 are both connected to the piston cavity 050 inside the outer shell 300. The first powder discharge port 041 and the second powder discharge port 042 are arranged opposite each other with the central axis of the piston cavity 050 as the center of symmetry.

[0104] Since the sealing part of the drive assembly 200 moves up and down in the piston cavity 050, and the first powder discharge port 041 and the second powder discharge port 042 are opened along the movement trajectory of the sealing part, when the sealing part of the drive assembly 200 moves in the piston cavity 050, it can squeeze the residual powder of the sand and powder fluid between the sealing part and the inner wall of the piston cavity 050 into the first powder discharge port 041 and the second powder discharge port 042. That is, the residual powder of the sand and powder fluid can be discharged from the piston cavity 050 through the first powder discharge port 041 and the second powder discharge port 042. This reduces the influence of the sand and powder fluid powder on the movement of the sealing part of the drive assembly 200 in the piston cavity 050, prevents the sealing part of the drive assembly 200 from getting stuck in the piston cavity 050, and thus improves the reliability of the fluid flow interruption structure. It is understandable that the first powder outlet 041 and the second powder outlet 042 can both be set as rectangular openings or rounded openings with their long sides located in the vertical direction. As long as the first powder outlet 041 and the second powder outlet 042 are set along the movement trajectory of the sealing part in the piston cavity 050, the shapes of the first powder outlet 041 and the second powder outlet 042 can be adaptively adjusted according to actual needs.

[0105] As can be seen, this optional embodiment can also provide a first powder discharge port 041 and a second powder discharge port 042 along the radial direction of the piston cavity 050 in the outer shell 300. When the sealing part of the drive assembly 200 moves in the radial direction of the piston cavity 050, the residual powder of the sand and powder fluid between the sealing part and the inner wall of the piston cavity 050 can be discharged from the piston cavity 050 through the first powder discharge port 041 and the second powder discharge port 042. This can reduce the influence of the powder of the sand and powder fluid on the movement of the sealing part of the drive assembly 200 in the piston cavity 050, thereby improving the reliability of the fluid flow interruption structure.

[0106] As shown in Figure 12, in an optional embodiment, the outer casing 300 includes a first base 310 and a second base 320. The first base 310 has a third through hole 061. A first piston groove 051 is provided on the connecting side of the first base 310. A first fixing groove 071 and a first storage groove 031 are provided on the inner surface of the first piston groove 051. A first row of powder grooves 0411 is provided at the first end of the first piston groove 051, and a second row of powder grooves 0412 is provided at the second end of the first piston groove 051. The third through hole 061 communicates with the first fixing groove 071. A first sealing assembly 110 is disposed in the first fixing groove 071. The first through hole 011 of the first sealing assembly 110 and the third through hole 061 of the first base 310 are arranged opposite each other. The second base 320 has a fourth through hole 062. A second piston groove 052 is provided on the connecting side of the second base 320. A second fixing groove 072 and a second storage groove 032 are provided on the inner surface of the second piston groove 052. A third row of powder grooves 0421 is provided at the first end of the second piston groove 052, and a fourth row of powder grooves 0412 is provided at the second end of the second piston groove 052. The powder trough 0422 has a fourth through hole 062 that communicates with the second fixing groove 072; the second sealing assembly 120 is disposed in the second fixing groove 072, and the second through hole 012 of the first sealing assembly 110 is disposed opposite to the fourth through hole 062 of the second base 320; wherein, the first end and the second end of the first piston groove 051 are the two opposite ends of the first piston groove 051, and the first end and the second end of the second piston groove 052 are the two opposite ends of the second piston groove 052; the connecting side of the first base 310 is disposed opposite to the connecting side of the second base 320, and the connecting side of the first base 310 is connected to the connecting side of the second base 320, so that the first piston groove 051 and the second piston groove 052 form a piston cavity 050, so that the first row of powder troughs 0411 and the third row of powder troughs 0421 form a first powder outlet 041, and so that the second row of powder troughs 0412 and the fourth row of powder troughs 0422 form a second powder outlet 042.

[0107] In this optional embodiment, referring to FIG12, the outer casing 300 can be divided into a first base 310 on the left side and a second base 320 on the right side. The connecting side of the first base 310 is located on the right side of the first base 310, and the connecting side of the second base 320 is located on the left side of the second base 320.

[0108] Referring to Figure 13, a first piston groove 051 is provided on the connecting side of the first base 310. A first powder groove 0411 and a second powder groove 0412 are respectively provided at the left and right ends of the first piston groove 051. The inner surface of the first piston groove 051 is the first inner surface of the piston cavity 050. Referring to Figure 6, a first fixing groove 071 is provided on the inner surface of the first piston groove 051. A first pre-compression member 111 and a first sealing member 112 are sequentially disposed in the first fixing groove 071, so that the first fixing groove 071 can fix the first pre-compression member 111 and the first sealing member 112.

[0109] Referring to Figure 14, a second piston groove 052 is provided on the connecting side of the second base 320. A third row of powder grooves 0421 and a fourth row of powder grooves 0422 are respectively opened at the left and right ends of the second piston groove 052. The inner surface of the second piston groove 052 is the second inner surface of the aforementioned piston cavity 050. Referring also to Figure 6, a second fixing groove 072 is provided on the inner surface of the second piston groove 052. The second pre-compression member 121 and the second sealing member 122 are sequentially disposed in the second fixing groove 072, so that the second fixing groove 072 can fix the second pre-compression member 121 and the second sealing member 122.

[0110] Referring to Figure 12, the connecting side of the first base 310 is connected to the connecting side of the second base 320, such that the first piston groove 051 of the first base 310 and the second piston groove 052 of the second base 320 enclose the piston cavity 050, the first powder groove 0411 of the first base 310 and the third powder groove 0421 of the second base 320 enclose the first powder outlet 041, and the second powder groove 0412 of the first base 310 and the fourth powder groove 0422 of the second base 320 enclose the second powder outlet 042. It can be understood that the shape of the first piston groove 051 and the shape of the second piston groove 052 are determined by the shape of the sealing portion of the drive assembly 200, as described with reference to the internal shape of the piston cavity 050.

[0111] In some embodiments, referring to FIG13, the first base 310 is further provided with a third through hole 061, and the third through hole 061 of the first base 310 is arranged opposite to and communicates with the first sub-through hole of the first pre-compression member 111 and the second sub-through hole of the first sealing member 112. Referring to FIG14, the second base 320 is further provided with a fourth through hole 062, and the fourth through hole 062 of the second base 320 is arranged opposite to and communicates with the third sub-through hole of the second pre-compression member 121 and the fourth sub-through hole of the second sealing member 122.

[0112] Referring to Figure 9, the inner surface of the first piston groove 051 of the first base 310 is further provided with a first sub-storage groove 0311 and a second sub-storage groove 0312 as described in the above embodiment. Referring to Figure 10, the inner surface of the second piston groove 052 of the second base 320 is further provided with a third sub-storage groove 0321 and a fourth sub-storage groove 0322 as described in the above embodiment. It is understandable that when setting the first sub-storage slot 0311, the second sub-storage slot 0312, the third sub-storage slot 0321, and the fourth sub-storage slot 0322, it is necessary to ensure that the first sealing member 112 swings at a radial angle of ≤5 degrees in the first fixed slot 071 to ensure the positional accuracy between the center of the first through hole 011 of the first sealing member 112 and the center of the third through hole 061 of the first base 310, and to ensure that the second sealing member 122 swings at a radial angle of ≤5 degrees in the second fixed slot 072 to ensure the positional accuracy between the center of the second through hole 012 of the second sealing member 122 and the center of the fourth through hole 062 of the second base 320112.

[0113] As shown in Figure 6, in an optional embodiment, the fluid flow control structure further includes a first flow guide connector 401 and a second flow guide connector 402. The first flow guide connector 401 is disposed at the third through hole 061 of the first base 310, and the interface of the first flow guide connector 401 is connected to the third through hole 061 of the first base 310 and the first through hole 011 of the first sealing assembly 110, respectively. The second flow guide connector 402 is disposed at the fourth through hole 062 of the second base 320, and the interface of the second flow guide connector 402 is connected to the fourth through hole 062 of the second base 320 and the second through hole 012 of the second sealing assembly 120, respectively.

[0114] In this optional embodiment, the first flow guide 401 is connected to the third through hole 061 of the first base 310, so that the interface of the first flow guide 401 communicates with the third through hole 061 of the first base 310, the first sub-through hole of the first pre-compression member 111, and the second sub-through hole of the first seal member 112, respectively. The second flow guide 402 is connected to the fourth through hole 062 of the second base 320, so that the interface of the second flow guide 402 communicates with the fourth through hole 062 of the second base 320, the third sub-through hole of the second pre-compression member 121, and the fourth sub-through hole of the second seal member 122, respectively. The first flow guide 401 and the second flow guide 402 can be connected to an external sandblasting guide pipe, allowing the fluid transported by the sandblasting guide pipe to enter and exit the fluid flow control structure.

[0115] As can be seen, this optional embodiment can also introduce and discharge the sandblasting fluid that needs to be controlled through the first flow guide 401 and the second flow guide 402, ensuring that the sandblasting fluid will not overflow when it is transported to and discharged from the fluid flow control structure, thereby improving the stability of the sandblasting fluid transportation.

[0116] As shown in Figure 15, in an optional embodiment, a first sealing ring 501 is provided between the outer shell 300 and the side of the first sealing component 110 and the side of the second sealing component 120, respectively.

[0117] In this optional embodiment, referring to FIG15, a first sealing ring 501 is provided between the side of the first sealing member 112 and the first fixing groove 071 on the housing 300, and between the side of the second sealing member 122 and the second fixing groove 072 on the housing 300. The first sealing ring 501 can prevent sand and powder fluid from flowing into the first fixing groove 071 and the second fixing groove 072 of the housing 300.

[0118] As shown in Figure 15, in an optional embodiment, a second sealing ring 502 for sealing is provided between the sealing part and the first sealing component 110 and the second sealing component 120 respectively.

[0119] In this optional embodiment, referring to FIG15, a second sealing ring 502 may be provided between the first sealing member 112 and the second sealing member 122 and the sealing portion, respectively. The middle portion of the second sealing ring 502 is designed as a through hole. Grooves for installing the sealing rings may be formed on the sealing surfaces of the first sealing member 112 and the second sealing member 122 facing the middle sealing portion. The through holes on the second sealing ring 502 are respectively aligned with the second sub-through holes of the first sealing member 112 and the fourth sub-through holes of the second sealing member 122 to ensure that the second sealing ring 502 does not block the fluid passages between the second sub-through holes and the fourth sub-through holes and the piston through hole 020, respectively. By providing the second sealing ring 502, the gap between the sand powder fluid flowing into the sealing portion and the first sealing member 112 and the second sealing member 122 can be effectively reduced, thereby reducing the friction between the sealing portion of the drive assembly 200 and the sealing surfaces of the first sealing member 112 and the second sealing member 122.

[0120] In an optional embodiment, the sealing surface roughness of the sealing part, the first sealing member 112 and the second sealing member 122 of the sealing device 100 is less than Ra0.2μm, the material hardness is greater than 500HV, and the flatness of the contact surface between the sealing device 100 and the sealing part is less than 0.005mm.

[0121] As shown in Figure 6, in an optional embodiment, the drive assembly 200 includes a cylinder body 210, a piston rod body 220, and a first spring member 230. The cylinder body 210 has a cylinder cavity and a vent 083; a sealing part is disposed on the piston rod body 220, which is disposed in the cylinder cavity, and the sealing part of the piston rod body 220 contacts the sealing surface of the first sealing assembly 110 and the sealing surface of the second sealing assembly 120 respectively; a first spring member 230 is disposed between the piston rod body 220 and the outer shell 300 in the cylinder cavity; wherein, the cylinder body 210 is used to introduce gas into the cylinder cavity through the vent 083, so that the introduced gas acts on the piston rod body 220 to push the sealing part of the piston rod body 220 to move in the piston cavity 050, so that the first through hole 011 and the second through hole 012 are connected through the piston through hole 020; the first spring member 230 is used to reset the piston rod body 220 so that the sealing part on the piston rod body 220 blocks the connection between the first through hole 011 and the second through hole 012.

[0122] In this optional embodiment, a vent 083 is provided at the bottom end of the cylinder body 210. The cylinder body 210 has a cylinder cavity with a radial direction running vertically. The vent 083 communicates with the cylinder cavity. The piston rod 220 is disposed in the cylinder cavity of the cylinder body 210, and the sealing part of the piston rod 220 is located in the upper part of the piston rod 220. The air supply device can supply air to the cylinder cavity inside the cylinder body 210 through the vent 083 of the cylinder body 210 to push the piston rod 220 to move longitudinally, thereby driving the sealing part of the piston rod 220 to move longitudinally in the piston cavity 050. A first spring-loaded member 230 is also provided between the piston rod 220 and the outer shell 300. The first spring-loaded member 230 can reset the piston rod 220 when the air supply device does not supply air to the cylinder cavity of the cylinder body 210. Since the sealing part of the piston rod body 220 has a piston through hole 020, when the air supply device vents air and drives the sealing part of the piston rod body 220 to move upward in the piston cavity 050, if the piston through hole 020 on the sealing part is aligned with the first through hole 011 and the second through hole 012, then the first through hole 011 and the second through hole 012 can be connected through the piston through hole 020, and the sandblasting fluid can flow through the first through hole 011, the piston through hole 020 and the second through hole 012; if the air supply device does not vent air to the cylinder cavity of the cylinder body 210, then the first spring member 230 resets the piston rod body 220, at which time the piston through hole 020 on the sealing part is misaligned with the first through hole 011 and the second through hole 012 respectively, and the non-through hole part of the sealing part can block the connection between the first through hole 011 and the second through hole 012.

[0123] As can be seen, this optional embodiment can also control the vertical movement of the sealing part of the piston rod body 220 in the piston cavity 050 by pressurizing the cylinder cavity through the cylinder body 210 and resetting the first spring member 230, thereby improving the operability and accuracy of controlling the flow of fluid, and thus improving the precision of controlling the start and stop of sandblasting powder spraying.

[0124] In an optional embodiment, the design value of the bottom surface area of ​​the sealing end of the plug body 220 increases with the increase of the elastic coefficient of the first spring member 230.

[0125] In this optional embodiment, referring to Figure 6, the sealing end of the plug rod 220 is located in the lower part of the plug rod 220, and the required design value of the bottom surface area of ​​the sealing end of the plug rod 220 is related to the elastic coefficient of the first rebound member 230. When the elastic coefficient of the first rebound member 230 increases, the bottom surface area of ​​the designed sealing end of the plug rod 220 increases accordingly. To ensure that the first rebound member 230 has sufficient rebound force to smoothly push the plug rod 220 to accurately reset during the rebound process, it is necessary to increase the elastic coefficient of the first rebound member 230 to increase the rebound force of the first rebound member 230. At this time, due to the increase in the elastic coefficient of the first rebound member 230, a larger thrust is required when the air supply device is ventilated so that the plug rod 220 can compress the first rebound member 230 upward. Let the thrust on the sealing end of the piston rod 220 be F = P × S, where P is the air pressure in the cylinder cavity of the cylinder body 210 and S is the bottom surface area of ​​the sealing end of the piston rod 220. To avoid wasting the venting gas, P needs to be a fixed value. In order to increase F, the design value of S needs to be increased accordingly to ensure that the air supply device has enough thrust to push the sealing end of the piston rod 220 to compress the first spring member 230.

[0126] As can be seen, this optional embodiment can also increase the design value of the bottom surface area of ​​the sealing end of the plug rod 220 as the elastic coefficient of the first rebound member 230 increases, so as to ensure that the air supply device has sufficient thrust to push the sealing end of the plug rod 220 to compress the first rebound member 230, and to ensure that the rebound force of the first rebound member 230 can smoothly push the plug rod 220 to accurately reset, thereby improving the accuracy of controlling the flow of sand powder fluid.

[0127] As shown in Figure 16, in an optional embodiment, the cylinder body 210 is provided with a first powder cleaning port 081 and a second powder cleaning port 082, both of which are connected to the cylinder cavity.

[0128] In this optional embodiment, referring to FIG16, the cylinder body 210 has a first powder cleaning port 081 and a second powder cleaning port 082 longitudinally formed on its outer wall. Both the first powder cleaning port 081 and the second powder cleaning port 082 communicate with the cylinder cavity inside the cylinder body 210. The first powder cleaning port 081 is arranged opposite to the first powder discharge port 041, and the second powder cleaning port 082 is arranged opposite to the second powder discharge port 042. This allows residual powder discharged from the first powder discharge port 041 to be cleaned through the first powder cleaning port 081, and residual powder discharged from the second powder discharge port 042 to be cleaned through the second powder discharge port 082. Thus, cleaning can be conveniently performed without the need to remove the cylinder body 210. It is understood that the shapes of the first powder cleaning port 081 and the second powder cleaning port 082 can be adapted to meet the needs of actual cleaning work. For example, both the first powder cleaning port 081 and the second powder cleaning port 082 can be set as horizontal rounded corner openings.

[0129] As can be seen, this optional embodiment can also clean the residual powder discharged from the first powder discharge port 041 and the second powder discharge port 042 through the first powder discharge port 081 and the second powder discharge port 082, without the need to remove the cylinder body 210, thereby improving the convenience of cleaning the fluid flow and cut-off structure.

[0130] As shown in Figure 17, in an optional embodiment, the fluid on / off control structure further includes a buffer assembly 600. The buffer assembly 600 is disposed at the sealing end of the piston rod 220, and / or at the end of the outer casing 300 facing the vent 083 and on the inner wall of the cylinder cavity of the cylinder body 210 near the vent 083. The buffer assembly 600 is used to buffer the collision between the cylinder body 210 and the outer casing 300 when the sealing end of the piston rod 220 moves in the cylinder cavity.

[0131] In this optional embodiment, referring to FIG17, the buffer assembly 600 can be disposed on the sealing end of the piston rod 220, or on the bottom end of the outer housing 300 and the inner wall of the bottom end of the cylinder cavity of the cylinder body 210, or the buffer assembly 600 can be disposed at all of the above locations. When the sealing end of the piston rod 220 moves in the cylinder cavity, the buffer assembly 600 can buffer the collision between the sealing end of the piston rod 220 and the cylinder body 210, thereby reducing the wear caused by the collision between the piston rod 220 and the outer housing 300 and the cylinder body 210, extending the service life of the on / off control structure, and also reducing the noise generated by the collision between the piston rod 220 and the outer housing 300 and the cylinder body 210.

[0132] As can be seen, this optional embodiment can also buffer the collision generated by the plug rod 220 through the buffer assembly 600, reduce the wear of the components related to the on / off control structure, extend the service life of the on / off control structure, and reduce the noise generated when the on / off control structure is working.

[0133] As shown in Figure 6, in an optional embodiment, the stopper rod body 220 includes: a stopper rod base 221, a stopper rod body 222, and a sealing plate 223. A piston rod base 221 is disposed within the cylinder cavity, and the circumference of the piston rod base 221 contacts the inner wall of the cylinder cavity to seal the cylinder cavity. A piston rod body 222 is disposed on the side of the piston rod base 221 away from the vent 083, and the piston rod body 222 has a fixed cavity. A sealing plate 223 is the sealing part of the drive assembly 200, and the sealing plate 223 has a piston through hole 020. The sealing plate 223 is disposed in the fixed cavity, and the first side of the sealing plate 223 contacts the sealing surface of the first sealing assembly 110, and the second side of the sealing plate 223 contacts the sealing surface of the second sealing assembly 120. The first side and the second side of the sealing plate 223 are two opposite sides of the sealing plate 223. The cylinder body 210 is used to introduce gas into the cylinder cavity through the vent 083 to push the piston rod base 221 and drive the sealing plate 223 to move in the piston cavity 050 so that the first through hole 011 and the second through hole 012 are connected through the piston through hole 020.

[0134] In this optional embodiment, referring to FIG6, the piston rod base 221 is disposed in the cylinder cavity, and the circumference of the piston rod base 221 contacts the inner wall of the cylinder cavity so that the lower side of the piston rod base 221 seals the cylinder cavity. Referring to FIG18, the piston rod body 222 is disposed on the upper side of the piston rod base 221. The piston rod body 222 is a frame-shaped limiting device, the middle part of which has a fixed through cavity. The fixed through cavity communicates with the outside of the piston rod body 222 through the left and right sides. The first spring member 230 is sleeved on the piston rod body 222. The lower end of the first spring member 230 contacts the upper side of the piston rod base 221, and the upper end of the first spring member 230 contacts the lower side of the outer shell 300.

[0135] Referring to Figure 6, the sealing plate 223 is the sealing part described in the above embodiment. The piston rod body 222 fixes the sealing plate 223 in the fixed through cavity of the piston rod body 222. The first side of the sealing plate 223 is located on its left side, and the second side of the sealing plate 223 is located on its right side. The first side of the sealing plate 223 contacts the sealing surface of the first sealing member 112, and the second side of the sealing plate 223 contacts the sealing surface of the second sealing member 122. The sealing plate 223 has a piston through hole 020 that connects the left and right sides.

[0136] In some embodiments, the air supply device pressurizes the cylinder cavity by supplying air to the cylinder cavity through the air vent 083 of the cylinder body 210, thereby pushing the piston rod base 221 to move upward longitudinally. This causes the piston rod body 222 and the sealing plate 223 to move upward in the piston cavity 050, so that the piston through hole 020 of the sealing plate 223 is aligned with the first through hole 011 and the second through hole 012, respectively. That is, at this time, the first through hole 011 and the second through hole 012 can be connected through the piston through hole 020, and the sandblasting fluid can flow through the first through hole 011, the piston through hole 020 and the second through hole 012. If the air supply device does not supply air to the cylinder cavity of the cylinder body 210, the first spring-loaded member 230 pushes the piston rod base 221 downward to reset the piston rod body 222 and the sealing plate 223. At this time, the piston through hole 020 on the sealing plate 223 is misaligned with the first through hole 011 and the second through hole 012 respectively, and the non-through hole part of the sealing plate 223 can block the communication between the first through hole 011 and the second through hole 012.

[0137] As can be seen, this optional embodiment can also fix the sealing plate 223 in the fixed cavity of the piston rod body 222 through the piston rod body 222, so that the sealing plate 223 will not be dislodged from the piston cavity 050 when it moves up and down in the piston cavity 050 due to the limitation, thereby ensuring the reliability of the fluid on / off control structure in controlling the fluid on / off.

[0138] As shown in Figures 6 and 18, in an optional embodiment, the first spring 230 is a spring in a helical shape and arranged axially along the cylinder cavity; wherein, the design value of the bottom surface area of ​​the piston rod base 221 increases with the increase of the spring wire diameter of the first spring 230.

[0139] In this optional embodiment, referring to Figures 6 and 18, the first spring 230 can be selected as a spring arranged in a spiral shape along the cylinder cavity axis. The spring is sleeved on the piston rod body 222, and the lower end of the spring contacts the upper side of the piston rod base 221, while the upper end of the spring contacts the lower side of the outer casing 300.

[0140] Since a larger spring wire diameter results in a higher overall spring constant, the rebound force of the first rebound member 230 is correspondingly greater. To ensure that the first rebound member 230 has sufficient rebound force during the rebound process to smoothly push the piston rod base 221 to the bottom of the cylinder cavity, so that the piston through hole 020 of the sealing plate 223 is accurately aligned with the fluid through hole of the outer casing 300, the spring wire diameter of the first rebound member 230 needs to be increased. Accordingly, according to the description of the above embodiment, to ensure that the air supply device has sufficient thrust to push the piston rod base 221 to compress the first rebound member 230, the design value of the bottom surface area of ​​the piston rod base 221 needs to increase with the increase of the spring wire diameter of the first rebound member 230.

[0141] As can be seen, this optional embodiment can also increase the spring force of the first spring member 230 by increasing the spring wire diameter of the first spring member 230, thereby ensuring that the first spring member 230 has sufficient spring force to smoothly push the stopper rod base 221 to reset during the springback process.

[0142] As shown in Figure 19, in an optional embodiment, the buffer assembly 600 includes a first buffer 610 and a second buffer 620. The first buffer 610 is disposed on the surface of the piston rod base 221 facing the vent 083, and is used to buffer the impact of the piston rod base 221 on the cylinder body 210 when it moves in the cylinder cavity; the second buffer 620 is disposed on the surface of the piston rod base 221 away from the vent 083, and is used to buffer the impact of the piston rod base 221 on the outer casing 300 when it moves in the cylinder cavity.

[0143] In this optional embodiment, referring to FIG19, a first buffer 610 is provided on the lower surface of the piston rod base 221. When the piston rod base 221 moves downward in the cylinder cavity and collides with the bottom of the cylinder cavity, the first buffer 610 can buffer the collision, thereby reducing the wear caused by the collision between the piston rod base 221 and the cylinder body 210, and reducing the noise generated after the collision. A second buffer 620 is provided on the upper surface of the piston rod base 221. When the piston rod base 221 moves upward in the cylinder cavity and collides with the bottom of the outer casing 300, the second buffer 620 can buffer the collision, thereby reducing the wear caused by the collision between the piston rod base 221 and the outer casing 300, and reducing the noise generated after the collision.

[0144] As can be seen, this optional embodiment can also reduce the wear caused by the collision between the piston rod base 221 and the cylinder body 210 and the outer shell 300, respectively, by setting the first buffer 610 on the surface of the piston rod base 221 facing the vent 083 and the second buffer 620 on the surface of the piston rod base 221 away from the vent 083, thereby extending the service life of the on / off control structure and reducing the noise generated by the on / off control structure during operation.

[0145] As shown in Figure 20, in an optional embodiment, the buffer assembly 600 includes a third buffer 630 and a fourth buffer 640. The third buffer 630 is disposed on the inner wall of the cylinder cavity of the cylinder body 210 near the vent 083, and is used to buffer the impact of the piston rod base 221 on the cylinder body 210 when it moves in the cylinder cavity; the fourth buffer 640 is disposed on the surface of the outer shell 300 facing the vent 083, and is used to buffer the impact of the piston rod base 221 on the outer shell 300 when it moves in the cylinder cavity.

[0146] In this optional embodiment, referring to FIG20, a third buffer 630 is provided at the bottom of the inner wall of the cylinder cavity of the cylinder body 210. When the piston rod base 221 moves downward in the cylinder cavity and collides with the bottom of the cylinder cavity, the third buffer 630 can buffer the collision, thereby reducing the wear caused by the collision between the piston rod base 221 and the cylinder body 210, and reducing the noise generated after the collision. A fourth buffer 640 is provided on the lower surface of the outer shell 300. When the piston rod base 221 moves upward in the cylinder cavity and collides with the bottom of the outer shell 300, the fourth buffer 640 can buffer the collision, thereby reducing the wear caused by the collision between the piston rod base 221 and the outer shell 300, and reducing the noise generated after the collision.

[0147] As can be seen, this optional embodiment can also reduce the wear caused by the collision between the piston rod base 221 and the cylinder body 210 and the outer shell 300, respectively, by setting the third buffer 630 on the inner wall of the cylinder cavity of the cylinder body 210 near the air vent 083 and the fourth buffer 640 on the surface of the on / off assembly facing the air vent 083, thereby extending the service life of the on / off control structure and reducing the noise generated when the on / off control structure is working.

[0148] It is understood that the first buffer 610, the second buffer 620, the third buffer 630, and the fourth buffer 640 included in the buffer assembly 600 can be adaptively configured according to the actual needs for collision buffering. For example, in a specific embodiment, as shown in FIG21, the first buffer 610, the second buffer 620, the third buffer 630, and the fourth buffer 640 included in the buffer assembly 600 can be configured simultaneously, and each can be configured in the corresponding position described in the above optional embodiments. When configured simultaneously, the buffering effect can be improved to reduce the damage caused by collision.

[0149] In an optional embodiment, a sealing ring 503 is provided circumferentially on the piston rod base 221, and the sealing ring 503 contacts the inner wall of the cylinder cavity to seal the cylinder cavity.

[0150] In this optional embodiment, referring to FIG22, the sealing ring 503 is circumferentially located on the piston rod base 221 and contacts the inner wall of the cylinder cavity of the cylinder body 210. When the air supply device vents air into the cylinder cavity of the cylinder body 210, the sealing ring 503 can ensure the sealing of the cylinder cavity below the piston rod base 221.

[0151] As can be seen, this optional embodiment can also seal the cylinder cavity through the sealing ring 503, so that the cylinder cavity can have sufficient air pressure to push the piston rod base 221 to move upward, thereby improving the reliability of the fluid on / off structure in controlling the flow of sand powder fluid.

[0152] As shown in Figure 22, in an optional embodiment, the drive assembly 200 includes a cylinder body 240, a piston rod body 220, a second spring-loaded element 250, and an electromagnet 260. The piston rod body 220, the second spring-loaded element 250, and the electromagnet 260 are disposed in the cylinder cavity of the cylinder body 240, and the second spring-loaded element 250 is disposed between the piston rod body 220 and the electromagnet 260. The piston rod body 220 includes a piston rod base 221, a piston rod body 222, and a sealing plate 223. The piston rod base 221 is made of ferromagnetic material and is disposed in the cylinder cavity, with its circumference in contact with the inner wall of the cylinder cavity. The piston rod body 222 is disposed on the side of the piston rod base 221 away from the electromagnet 260, and has a fixed through cavity. The sealing plate 223 is the sealing part of the drive assembly 200, and has a piston through hole 020. The sealing plate 223 is disposed in the fixed through cavity, with its first side contacting the sealing surface of the first sealing assembly 110, and its second side contacting the sealing surface of the first sealing assembly 110. The sealing surfaces of the two sealing assemblies 120 are in contact, and the first side and the second side of the sealing plate 223 are two opposite sides of the sealing plate 223; wherein, the electromagnet 260 is used to push the piston rod base 221 by magnetic force, so as to drive the sealing plate 223 to move in the piston cavity 050, so that the first through hole 011 and the second through hole 012 are connected through the piston through hole 020; the second spring member 250 is used to reset the piston rod base 221, so that the sealing plate 223 blocks the connection between the first through hole 011 and the second through hole 012.

[0153] In this optional embodiment, referring to FIG22, the drive assembly 200 may include: a cylinder 240, a piston rod body 220, a second spring-loaded element 250, and an electromagnet 260. The piston rod body 220 consists of a piston rod base 221, a piston rod body 222, and a sealing plate 223. The piston rod base 221 on the piston rod body 220 is made of ferromagnetic material, and the second spring-loaded element 250 is disposed between the piston rod base 221 and the electromagnet 260.

[0154] When the electromagnet 260 is energized, the piston rod base 221 is attracted and moves toward the electromagnet 260, thereby driving the piston rod body 222 and the sealing plate 223 to move toward the electromagnet 260, so that the piston through hole 020 on the sealing plate 223 is connected to the first through hole 011 and the second through hole 012 respectively; when the electromagnet 260 is de-energized, under the action of the second spring member 250, the piston through hole 020 is misaligned with the first through hole 011 and the second through hole 012.

[0155] As can be seen, this optional embodiment can also control the movement of the plug rod 220 by means of the magnetic force control of the electromagnet 260, thereby controlling the on / off of the fluid on / off control structure, thus realizing rapid response and precise control of the sandblasting powder on / off.

[0156] As shown in Figure 23, in an optional embodiment, the fluid on / off control structure further includes a quick-connect base 700. The quick-connect base 700 is connected to an external air supply device, and the connecting end of the quick-connect base 700 has a first connecting portion 085 and an air guide port 084; wherein, the connecting end of the cylinder body 210 has a second connecting portion 086 and an air vent 083, the air vent 083 is in communication with the cylinder cavity, the second connecting portion 086 of the cylinder body 210 is detachably connected to the first connecting portion 085 of the quick-connect base 700, and the air vent 083 of the cylinder body 210 is disposed opposite to the air guide port 084 of the quick-connect base 700; the air supply device is used to supply air to the cylinder cavity through the air guide port 084 and the air vent 083.

[0157] In this optional embodiment, the top of the quick-connect base 700 is its connecting end, and the connecting end of the quick-connect base 700 has a first connecting portion 085 and an air vent 084. The bottom end of the cylinder body 210 is its connecting end, and the connecting end of the cylinder body 210 has a second connecting portion 086 and an air vent 083, and the air vent 083 communicates with the cylinder cavity of the cylinder body 210.

[0158] The first connecting portion 085 of the quick-connect base 700 can be detachably connected to the second connecting portion 086 of the cylinder body 210. In the event of maintenance, the fluid flow control structure can be quickly disassembled from the quick-connect base 700 and the cylinder body 210 to perform maintenance on its various components, thereby improving the efficiency of maintenance. After the quick-connect base 700 is connected to the cylinder body 210, the air inlet 084 of the quick-connect base 700 is aligned with the air outlet 083 of the cylinder body 210, allowing air from the air supply device to be delivered to the air outlet 083 of the cylinder body 210 through the air inlet 084 of the quick-connect base 700.

[0159] In some embodiments, the air supply device can supply air to the cylinder cavity inside the cylinder body 210 through the air inlet 084 of the quick-connect base 700 and the air outlet 083 of the cylinder body 210, so as to control the on / off state between the sealing plate 223 and the first seal 112 and the second seal 122 respectively.

[0160] As can be seen, this optional embodiment can also be detachably connected to the first connecting part 085 of the quick-connect base 700 and the second connecting part 086 of the cylinder body 210. When maintenance is required, the fluid switching structure can quickly disassemble the quick-connect base 700 and the cylinder body 210 to maintain the various components of the fluid switching structure, thereby improving the efficiency of maintaining the various components of the fluid switching structure and achieving the effect of rapid maintenance.

[0161] As shown in Figure 24, in an optional embodiment, the first connecting part 085 includes a base connecting hole 087, and the second connecting part 086 includes a cylinder connecting hole 088. The base connecting hole 087 and the cylinder connecting hole 088 are detachably connected by screws.

[0162] In this optional embodiment, referring to FIG24, the first connecting portion 085 of the quick-connect base 700 has a base connecting hole 087, and the second connecting portion 086 of the cylinder body 210 has a cylinder connecting hole 088. When the base connecting hole 087 and the cylinder connecting hole 088 are aligned, the base connecting hole 087 and the cylinder connecting hole 088 can be detachably connected by screws, thereby realizing the connection between the quick-connect base 700 and the cylinder body 210.

[0163] As can be seen, this optional embodiment can also detachably connect the base connection hole 087 and the cylinder connection hole 088 with screws, thereby improving the stability of the connection between the quick-connect base 700 and the cylinder body 210. At the same time, the detachable screw connection can also facilitate the quick disassembly of the quick-connect base 700 and the cylinder body 210 to maintain and repair the various components of the fluid flow switching structure, thereby improving the efficiency of maintaining and repairing the various components of the fluid flow switching structure.

[0164] As shown in Figures 25 and 26, in an optional embodiment, both the connecting end of the quick-connect base 700 and the connecting end of the cylinder body 210 are cylindrical structures. The cylindrical radius of the connecting end of the quick-connect base 700 is larger than the cylindrical radius of the connecting end of the cylinder body 210, so that the connecting end of the quick-connect base 700 can be fitted onto the outside of the connecting end of the cylinder body 210.

[0165] In this optional embodiment, referring to FIG25, the top connecting end of the quick-connect base 700 is cylindrical, and the bottom end of the internal cavity of the cylindrical connecting end is the air inlet 084 of the quick-connect base 700. Referring to FIG26, the bottom connecting end of the cylinder body 210 is cylindrical, and the bottom end of the cylindrical connecting end is the air vent 083 of the cylinder body 210.

[0166] Since the design value of the cylindrical radius of the quick-connect base 700 connection end is greater than the design value of the cylindrical radius of the cylinder body 210 connection end, referring to Figure 27, the connection end of the quick-connect base 700 can be sleeved on the outside of the connection end of the cylinder body 210, and the air guide port 084 of the quick-connect base 700 can be aligned with the air vent 083 of the cylinder body 210 and sealed relative to the outside, so that the air supply device can deliver the air supply to the air vent 083 of the cylinder body 210 through the air guide port 084 of the quick-connect base 700.

[0167] As can be seen, this optional embodiment improves the stability of the connection between the quick-connect base 700 and the cylinder body 210 by setting the cylindrical radius of the connecting end of the quick-connect base 700 to be larger than the outer side of the connecting end of the cylinder body 210.

[0168] As shown in Figures 25 and 26, in an optional embodiment, the base connection hole 087 includes a first connection hole 0871 and a second connection hole 0872. The first connection hole 0871 and the second connection hole 0872 are set on the cylindrical wall of the connecting end of the quick-connect base 700 with the center of the cylinder as the center and a preset connection hole angle. The cylinder connection hole 088 includes a third connection hole 0881 and a fourth connection hole 0882. The third connection hole 0881 and the fourth connection hole 0882 are set on the cylindrical wall of the connecting end of the cylinder body 210 with the center of the cylinder as the center and a connection hole angle. The first connection hole 0871 and the third connection hole 0881 are detachably connected by screws, and the second connection hole 0872 and the fourth connection hole 0882 are detachably connected by screws.

[0169] In this optional embodiment, the quick-connect base 700 has a base connection hole 087 including a first connection hole 0871 and a second connection hole 0872, and the cylinder connection hole 088 of the cylinder body 210 includes a third connection hole 0881 and a fourth connection hole 0882.

[0170] Referring to Figure 25, the first connecting hole 0871 and the second connecting hole 0872 are centered on the cylindrical center of the quick-connect base 700's connecting end and are set on the cylindrical wall of the quick-connect base 700's connecting end according to a preset connecting hole angle. Referring to Figure 26, the third connecting hole 0881 and the fourth connecting hole 0882 are centered on the cylindrical center of the cylinder body 210's connecting end and are set on the cylindrical wall of the cylinder body 210's connecting end according to the same connecting hole angle. Therefore, referring to Figure 27, it is ensured that when the quick-connect base 700's connecting end is fitted onto the outside of the cylinder body 210's connecting end, the first connecting hole 0871 is aligned with the third connecting hole 0881, and the second connecting hole 0872 is aligned with the fourth connecting hole 0882. It is understood that the preset connecting hole angle can be adaptively adjusted according to actual connecting hole setting requirements.

[0171] When the base connecting end is sleeved on the outside of the cylinder body 210 connecting end, and the first connecting hole 0871 is aligned with the third connecting hole 0881, and the second connecting hole 0872 is aligned with the fourth connecting hole 0882, the first connecting hole 0871 and the third connecting hole 0881 can be detachably connected by screws, and the second connecting hole 0872 and the fourth connecting hole 0882 can be detachably connected by screws.

[0172] As can be seen, this optional embodiment can also configure the base connection hole 087 as the first connection hole 0871 and the second connection hole 0872, and the cylinder connection hole 088 as the third connection hole 0881 and the fourth connection hole 0882. The first connection hole 0871 and the second connection hole 0872, as well as the third connection hole 0881 and the fourth connection hole 0882, are all set with the same included angle, thereby improving the stability of the connection between the quick-connect base 700 and the cylinder body 210.

[0173] As shown in Figure 28, in an optional embodiment, the sealing device 100 is a single plate, the first through hole 011 and the second through hole 012 are both provided on the plate, the sealing part is provided at the lower end of the sealing device 100, and the piston through hole 020 is a groove opened downward from the upper end of the sealing part.

[0174] In this optional embodiment, referring to FIG28, the sealing device 100 is a single plate. The first through hole 011 and the second through hole 012 are both located on this plate. The sealing part is disposed close to the lower end of the sealing device 100. The piston through hole 020 is a groove extending downwards from the upper end of the sealing part. When the lower ends of the first through hole 011 and the second through hole 012 are both located inside the piston through hole 020, they are open, allowing sand and powder fluid to pass through. When the first through hole 011 and / or the second through hole 012 are located outside the piston through hole 020, they are closed, blocking the sand and powder fluid. The surface roughness of the single plate used in the sealing device 100 is less than Ra0.8μm, its material hardness is greater than 180HV, and the flatness of the contact surface between the sealing device 100 and the sealing part is less than 0.01mm. The sealing part is also a single plate with a surface roughness less than Ra0.8μm.

[0175] As shown in Figure 29, in an optional embodiment, the sealing device 100 is a cylinder, the first through hole 011 and the second through hole 012 are provided on the side of the sealing device 100, the sealing part is a core rod provided inside the sealing device 100, and the piston through hole 020 is a through hole that radially penetrates the sealing part.

[0176] In this optional embodiment, referring to FIG29, the fluid on / off control structure includes a sealing device 100 and a drive assembly 200, the drive assembly 200 having a sealing portion, and both the sealing device 100 and the sealing portion being disposed inside the housing 300.

[0177] In some embodiments, the sealing device 100 is a ceramic cylinder, and the sealing part is a ceramic mandrel. The mandrel is fitted inside the cylinder, and the surface roughness of their mating surfaces is less than Ra 0.8 μm, the material hardness is greater than 180 HV, and the flatness of the contact surface between the sealing device 100 and the sealing part is less than 0.01 mm. A first through hole 011 and a second through hole 012 are provided on the side of the sealing device 100, extending radially along the cylinder. The two holes on the side wall are respectively the first through hole 011 and the second through hole 012. The piston through hole 020 is a through hole extending radially through the sealing part. The first through hole 011, the second through hole 012, and the piston through hole 020 are located at the same height. To save material and space, the sealing device 100 also serves as the outer shell, and the first through hole 011 and the second through hole 012 are respectively connected to the two flow guides described in the above embodiments.

[0178] In an optional embodiment, the drive assembly is one of a motor, an electromagnet, or a cylinder, used to control the rotation or movement of the sealing part.

[0179] In this optional embodiment, the driving component 200 of the cylindrical sealing device 100 can be a motor. By connecting the sealing part to the main shaft of the motor, intermediate transmission components are saved, making the structure more compact and facilitating installation inside the sand gun. The motor can drive the sealing part to rotate circumferentially inside the sealing device 100, thereby allowing the piston through hole 020 to be connected or offset between the first through hole 011 and the second through hole 012. In addition, the driving component 200 can also be an electromagnet 260 or a cylinder 210 as described in the above embodiments, controlling the movement of the sealing part through the magnetic force of the electromagnet 260 or the air pressure pushing action of the cylinder 210.

[0180] In an optional embodiment, the sealing parts of the sealing device 100 and the drive assembly 200 are made of ceramic or stainless steel.

[0181] This application also discloses a sandblasting dental cleaning device, which includes a device body and a fluid on / off control structure described in the above embodiments of this application, wherein the fluid on / off control structure is installed on the device body.

[0182] As can be seen, the air-blasting dental cleaning equipment adopts the above-mentioned fluid flow control structure. The drive component 200 controls the movement of the sealing device 100 and / or the sealing part, so that the target through hole 010 on the sealing device 100 is connected or disconnected from the piston through hole 020 on the sealing part. During this process, the sealing device 100 and the sealing part are not easily deformed by external force, that is, the sealing device 100 and the sealing part are not easily worn, thereby improving the airtightness of the fluid flow control structure and making it more reliable and longer in service life.

Claims

1. A fluid on / off control structure, comprising: A sealing device having a target through hole; A drive assembly having a sealing portion having a piston through hole, and at least one surface contact seal between the sealing portion and the sealing device; the drive assembly is used to drive the sealing device and / or the sealing portion to move so that the piston through hole and the target through hole are connected or offset.

2. The fluid shutoff control structure of claim 1, wherein, The target through-hole includes: a first through-hole and a second through-hole; wherein, the driving assembly is used to drive the sealing device and / or the sealing part so that the piston through-hole is connected or offset between the first through-hole and the second through-hole.

3. The fluid on / off control structure according to claim 2, further comprising: An outer casing having a piston cavity; The sealing device includes: A first sealing assembly is disposed on a first inner surface of the piston cavity. The first sealing assembly has a pre-tightening portion that applies a pre-tightening force to the sealing surface of the first sealing assembly. The first sealing assembly has a first through hole. The second sealing assembly is disposed on the second inner surface of the piston cavity. The second sealing assembly has a pre-tightening portion that applies a pre-tightening force to the sealing surface of the second sealing assembly. The second sealing assembly has a second through hole. The first inner surface and the second inner surface are two inner surfaces opposite to the piston cavity. The sealing surfaces of the first sealing assembly and the second sealing assembly are disposed opposite to each other. The first through hole and the second through hole are disposed opposite to each other. The sealing portion of the drive assembly contacts the sealing surfaces of the first sealing assembly and the second sealing assembly, respectively. The sealing portion of the drive assembly is used to move in the piston cavity to allow the first through hole and the second through hole to communicate through the piston through hole, or to block the communication between the first through hole and the second through hole.

4. The fluid shutoff control structure of claim 3, wherein, The first sealing assembly includes: A first pre-compression member is disposed on the first inner surface of the piston cavity, and the first pre-compression member has a first sub-through hole; A first seal is disposed on the side of the first pre-compression member away from the first inner surface of the piston cavity, and the first seal has a second sub-through hole; wherein the first sub-through hole and the second sub-through hole are disposed opposite to each other and communicate with each other to form the first through hole, the sealing surface of the first sealing assembly is the sealing surface of the first seal, and the sealing surface of the first seal is the side of the first seal away from the first pre-compression member.

5. The fluid shutoff control structure of claim 4, wherein, The second sealing assembly includes: The second pre-compression member is disposed on the second inner surface of the piston cavity, and the second pre-compression member has a third sub-through hole; The second seal is disposed on the side of the second pre-compression member away from the second inner surface of the piston cavity, and the second seal has a fourth sub-through hole; wherein the third sub-through hole and the fourth sub-through hole are disposed opposite to each other and communicate with each other to form the second through hole, the sealing surface of the second sealing assembly is the sealing surface of the second seal, the sealing surface of the second seal is the side of the second seal away from the second pre-compression member, and the sealing surface of the second seal is disposed opposite to the sealing surface of the first seal.

6. The fluid shutoff control structure of claim 5, wherein, The materials used to make the first pre-clamping component and the second pre-clamping component are soft materials or elastic materials, respectively.

7. The fluid shutoff control structure of claim 3, wherein, A first fixing groove is provided on the first inner surface of the piston cavity, and a second fixing groove is provided on the second inner surface of the piston cavity. The first sealing component is disposed in the first fixing groove, and the second sealing component is disposed in the second fixing groove.

8. The fluid shutoff control structure of claim 7, wherein, The piston cavity of the outer shell is provided with a target collection groove on its inner wall. The first through hole and the second through hole are respectively connected to the external sandblasting guide pipe. The sandblasting guide pipe is used to transport sand powder fluid, and the target collection groove is used to collect residual powder of the sand powder fluid in the piston cavity.

9. The fluid shutoff control structure of claim 8, wherein, The target storage slot includes a first storage slot and a second storage slot; The piston cavity has a first receiving groove on its first inner surface and a second receiving groove on its second inner surface; the first receiving groove is connected to the first fixing groove and the second receiving groove is connected to the second fixing groove; both the first receiving groove and the second receiving groove are used to collect residual powder of the sand and powder fluid in the piston cavity.

10. The fluid on-off control structure of claim 9, wherein, The first storage slot includes a first sub-storage slot and a second sub-storage slot. The first sub-storage slot is disposed at the first end of the first fixed slot, and the second sub-storage slot is disposed at the second end of the first fixed slot. The first end and the second end of the first fixed slot are opposite ends of the first fixed slot in the radial direction of the piston cavity.

11. The fluid on-off control structure of claim 10, wherein, The second storage slot includes a third sub-storage slot and a fourth sub-storage slot. The third sub-storage slot is disposed at the first end of the second fixed slot, and the fourth sub-storage slot is disposed at the second end of the second fixed slot. The first end and the second end of the second fixed slot are opposite ends of the second fixed slot in the radial direction of the piston cavity.

12. The fluid shutoff control structure of claim 9, wherein, The outer shell is provided with a target powder discharge port in the radial direction of the piston cavity. The target powder discharge port is connected to the piston cavity and is used to provide a discharge channel for the residual powder of the sand and powder fluid in the piston cavity to be discharged to the outside of the outer shell.

13. The fluid shutoff control structure of claim 12, wherein, The target powder discharge port includes a first powder discharge port and a second powder discharge port; The outer shell is provided with a first powder discharge port and a second powder discharge port in the radial direction of the piston cavity. The first powder discharge port and the second powder discharge port are arranged opposite to each other. Both the first powder discharge port and the second powder discharge port are in communication with the piston cavity. Both the first powder discharge port and the second powder discharge port are used to discharge the residual powder of the sand and powder fluid in the piston cavity to the outside of the outer shell.

14. The fluid shutoff control structure of claim 13, wherein, The outer casing includes: A first base has a third through hole. A first piston groove is provided on the connecting side of the first base. A first fixing groove and a first storage groove are provided on the inner surface of the first piston groove. A first powder discharge groove is provided at the first end of the first piston groove, and a second powder discharge groove is provided at the second end of the first piston groove. The third through hole communicates with the first fixing groove. A first sealing component is disposed in the first fixing groove. The first through hole of the first sealing component and the third through hole of the first base are arranged opposite to each other. The second base has a fourth through hole, and a second piston groove is provided on the connecting side of the second base. The second piston groove has a second fixing groove and a second storage groove on its inner surface. The first end of the second piston groove has a third row of powder grooves, and the second end of the second piston groove has a fourth row of powder grooves. The fourth through hole communicates with the second fixing groove. The second sealing component is disposed in the second fixing groove, and the second through hole of the first sealing component is disposed opposite to the fourth through hole of the second base. Wherein, the first end of the first piston groove and the second end of the first piston groove are the two opposite ends of the first piston groove, and the first end of the second piston groove and the second end of the second piston groove are the two opposite ends of the second piston groove; the connecting side of the first base and the connecting side of the second base are arranged opposite to each other, and the connecting side of the first base and the connecting side of the second base are connected, so that the first piston groove and the second piston groove form the piston cavity, the first powder discharge groove and the third powder discharge groove form the first powder discharge port, and the second powder discharge groove and the fourth powder discharge groove form the second powder discharge port.

15. The fluid on / off control structure according to claim 14, further comprising: The first flow guide connector is disposed at the third through hole of the first base, and the interface of the first flow guide connector is connected to the third through hole of the first base and the first through hole of the first sealing assembly respectively. The second flow guide is disposed at the fourth through hole of the second base, and the interface of the second flow guide is connected to the fourth through hole of the second base and the second through hole of the second sealing assembly, respectively.

16. The fluid shutoff control structure of claim 3, wherein, The outer casing is provided with a first sealing ring between the side of the first sealing component and the side of the second sealing component.

17. The fluid shutoff control structure of claim 3, wherein, The sealing part is provided with a second sealing ring for sealing between itself and the first sealing component and the second sealing component respectively.

18. The fluid shutoff control structure of claim 3, wherein, The driving component includes: A cylinder block having a cylinder cavity and a vent; A piston rod body, wherein the sealing part is disposed on the piston rod body, the piston rod body is disposed inside the cylinder cavity, and the sealing part of the piston rod body contacts the sealing surface of the first sealing assembly and the sealing surface of the second sealing assembly respectively; The first rebound element is disposed between the piston rod body and the outer shell body in the cylinder cavity; The cylinder body is used to introduce gas into the cylinder cavity through the vent, so that the introduced gas acts on the piston rod body to push the sealing part of the piston rod body to move in the piston cavity, so that the first through hole and the second through hole are connected through the piston through hole; the first spring member is used to reset the piston rod body so that the sealing part on the piston rod body blocks the connection between the first through hole and the second through hole.

19. The fluid shutoff control structure of claim 18, wherein, The design value of the bottom surface area of ​​the sealing end of the plug rod increases with the increase of the elastic coefficient of the first rebound member.

20. The fluid shutoff control structure of claim 18, wherein, The cylinder body is provided with a first powder cleaning port and a second powder cleaning port, both of which are connected to the cylinder cavity.

21. The fluid on / off control structure according to claim 18, further comprising: A buffer assembly is provided at the sealing end of the piston rod body, and / or at the end of the outer shell body facing the vent and the inner wall of the cylinder cavity near the vent. The buffer assembly is used to buffer the collision between the cylinder cavity and the outer shell body when the sealing end of the piston rod body moves in the cylinder cavity.

22. The fluid shutoff control structure of claim 21, wherein, The piston rod body includes: A piston rod base is disposed within the cylinder cavity, and the circumferential direction of the piston rod base contacts the inner wall of the cylinder cavity to seal the cylinder cavity; A stopper rod body is disposed on the side of the stopper rod base away from the vent, and the stopper rod body has a fixed cavity; A sealing sheet, which is the sealing part of the drive assembly, has a piston through hole and is disposed in the fixed through cavity. The first side of the sealing sheet contacts the sealing surface of the first sealing assembly, and the second side of the sealing sheet contacts the sealing surface of the second sealing assembly. The first side and the second side of the sealing sheet are two opposite sides of the sealing sheet. The cylinder body is used to introduce gas into the cylinder cavity through the air inlet to push the piston rod base and drive the sealing plate to move in the piston cavity, so that the first through hole and the second through hole are connected through the piston through hole.

23. The fluid shutoff control structure of claim 22, wherein, The first rebound element is a spring with a helical shape and arranged axially along the cylinder cavity; wherein, the design value of the bottom surface area of ​​the piston rod base increases with the increase of the spring wire diameter of the first rebound element.

24. The fluid shutoff control structure of claim 22, wherein, The buffer component includes: A first buffer is disposed on the surface of the piston rod base facing the vent, and the first buffer is used to buffer the collision of the piston rod base with the cylinder body when the piston rod base moves in the cylinder cavity; The second buffer is disposed on the surface of the piston rod base away from the vent, and is used to buffer the impact of the piston rod base on the outer shell when it moves in the cylinder cavity.

25. The fluid shutoff control structure of claim 22, wherein, The buffer component includes: The third buffer is disposed on the inner wall of the cylinder cavity near the air vent end of the cylinder body. The third buffer is used to buffer the collision of the cylinder body with the piston rod base when it moves in the cylinder cavity. A fourth buffer is disposed on the surface of the outer casing facing the vent, and the fourth buffer is used to buffer the impact of the piston rod base on the outer casing when it moves in the cylinder cavity.

26. The fluid shutoff control structure of claim 22, wherein, The piston rod base is provided with a sealing ring in the circumferential direction. The sealing ring contacts the inner wall of the cylinder cavity to seal the cylinder cavity.

27. The fluid shutoff control structure of claim 3, wherein, The drive assembly includes a cylinder body, a piston rod body, a second spring-loaded component, and an electromagnet. The piston rod body, the second spring-loaded component, and the electromagnet are disposed in the cylinder cavity of the cylinder body, and the second spring-loaded component is disposed between the piston rod body and the electromagnet. The piston rod body includes: A piston rod base, the piston rod base being made of ferromagnetic material, the piston rod base being disposed in the cylinder cavity, and the circumferential direction of the piston rod base being in contact with the inner wall of the cylinder cavity; A stopper rod body is disposed on the side of the stopper rod base away from the electromagnet, and the stopper rod body has a fixed through cavity; A sealing sheet, which is the sealing part of the drive assembly, has a piston through hole and is disposed in the fixed through cavity. The first side of the sealing sheet contacts the sealing surface of the first sealing assembly, and the second side of the sealing sheet contacts the sealing surface of the second sealing assembly. The first side and the second side of the sealing sheet are two opposite sides of the sealing sheet. The electromagnet is used to push the piston rod base by magnetic force, so as to drive the sealing plate to move in the piston cavity, so that the first through hole and the second through hole are connected through the piston through hole; the second spring is used to reset the piston rod base, so that the sealing plate blocks the connection between the first through hole and the second through hole.

28. The fluid on / off control structure according to claim 18, further comprising: A quick-connect base, which is connected to an external air supply device, has a first connecting part and an air duct at the connecting end of the quick-connect base; The cylinder body has a second connecting part and a vent at its connecting end. The vent communicates with the cylinder cavity. The second connecting part of the cylinder body is detachably connected to the first connecting part of the quick-connect base. The vent of the cylinder body is opposite to the air guide port of the quick-connect base. The air supply device is used to supply air to the cylinder cavity through the air guide port and the vent.

29. The fluid shutoff control structure of claim 28, wherein, The first connecting part includes a base connecting hole, and the second connecting part includes a cylinder connecting hole. The base connecting hole and the cylinder connecting hole are detachably connected by screws.

30. The fluid shutoff control structure of claim 29, wherein, Both the connecting end of the quick-connect base and the connecting end of the cylinder body are cylindrical structures. The cylindrical radius of the connecting end of the quick-connect base is larger than the cylindrical radius of the connecting end of the cylinder body, so that the connecting end of the quick-connect base can be fitted onto the outside of the connecting end of the cylinder body.

31. The fluid shutoff control structure of claim 30, wherein, The base connection hole includes a first connection hole and a second connection hole. The first connection hole and the second connection hole are set on the cylindrical wall of the connecting end of the quick-connect base with the center of the cylinder as the center and with a preset connection hole angle. The cylinder connection hole includes a third connection hole and a fourth connection hole. The third connection hole and the fourth connection hole are set on the cylindrical wall of the connecting end of the cylinder body with the center of the cylinder as the center and with the connection hole angle. The first connecting hole and the third connecting hole are detachably connected by screws, and the second connecting hole and the fourth connecting hole are detachably connected by screws.

32. The fluid shutoff control structure of claim 1, wherein, The surface roughness of the sealing device and the sealing part is less than Ra0.2μm, the material hardness is greater than 500HV, and the flatness of the contact surface of the sealing device and the sealing part is less than 0.005mm.

33. The fluid shutoff control structure of claim 2, wherein, The sealing device is a single plate, and the first through hole and the second through hole are both provided on the plate. The sealing part is provided at the lower end of the sealing device, and the piston through hole is a groove opened downward from the upper end of the sealing part.

34. The fluid shutoff control structure of claim 2, wherein, The sealing device is a cylinder, the first through hole and the second through hole are provided on the side of the sealing device, the sealing part is a core rod provided inside the sealing device, and the piston through hole is a through hole that radially penetrates the sealing part.

35. The fluid shutoff control structure of claim 34, wherein, The drive assembly is one of a motor, an electromagnet, or a cylinder, used to control the rotation or movement of the sealing part.

36. The fluid shutoff control structure of claim 33 or 34, wherein, The surface roughness of the sealing device and the sealing part is less than Ra0.8μm, the material hardness is greater than 180HV, and the flatness of the contact surface of the sealing device and the sealing part is less than 0.01mm.

37. The fluid on / off control structure of claim 1, wherein, The sealing device and sealing part are made of ceramic or stainless steel.

38. A dental air polishing device, comprising: Equipment body; The fluid on / off control structure according to any one of claims 1 to 37, wherein the fluid on / off control structure is installed on the device body.

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