Fluid on-off structure and dental sand blasting equipment

Abstract

The utility model discloses a fluid on-off structure and dental sandblasting equipment, the fluid on-off structure comprises: an on-off assembly and a piston assembly, the on-off assembly is provided with a piston cavity, the inner wall of the piston cavity is provided with a target receiving groove, the piston end of the piston assembly is used for moving in the radial direction of the piston cavity, and when the piston end of the piston assembly moves, the target receiving groove is formed in the inner wall of the piston cavity. The residual powder of the sand powder fluid between the piston end and the inner wall of the piston cavity can be squeezed into the target storage groove, namely the target storage groove can collect the residual powder of the sand powder fluid. According to the fluid on-off structure and the dental sand blasting equipment, the influence of the powder of the sand powder fluid on the movement of the piston end of the piston assembly in the piston cavity can be reduced, so that the accuracy of controlling the on-off of the sand powder fluid is improved.

Description

Technical Field

[0001] This utility model relates to the field of dental medical device technology, and in particular to a fluid flow control structure and a dental sandblasting device. Background Technology

[0002] Currently, in dentistry, air polishing involves using compressed air to propel air polishing powder onto the tooth surface. This powder, combined with a liquid medium, uses kinetic energy to impact plaque and tartar on the tooth surface, thus cleaning the teeth.

[0003] In practical applications, dental blasting equipment needs to be able to quickly control the start and stop of blasting powder. Therefore, a fluid flow control structure is required between the powder chamber and the nozzle in the dental blasting equipment. This fluid flow control structure uses air pressure to push the piston end of the piston assembly to move within the piston cavity of the flow control component, controlling whether the through hole on the piston end can communicate with the through hole of the flow control component, thereby controlling the flow of powder fluid.

[0004] However, in actual operation, after repeatedly controlling the flow of sand and powder fluid, sand and powder particles can enter between the piston end of the piston assembly and the inner wall of the on / off component. This increases the friction between the piston end and the inner wall of the on / off component, affecting the movement of the piston end within the piston cavity and resulting in low accuracy in controlling the flow of sand and powder fluid. Therefore, reducing the impact of sand and powder particles on the movement of the piston end within the piston cavity to improve the accuracy of controlling the flow of sand and powder fluid has become an urgent problem to be solved. Utility Model Content

[0005] This utility model discloses a fluid flow control structure and a dental sandblasting device, which can reduce the influence of sand powder fluid on the piston end of the piston assembly moving in the piston cavity, thereby improving the accuracy of controlling the flow of sand powder fluid.

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

[0007] A switching assembly has a piston cavity, and a fluid through hole is provided in the radial direction perpendicular to the piston cavity. The fluid through hole communicates with the piston cavity. A target receiving groove is provided on the inner wall of the piston cavity. The fluid through hole communicates with an external sandblasting guide pipe. The sandblasting guide pipe is used to transport sand powder fluid.

[0008] A piston assembly, wherein the piston end of the piston assembly has a piston through hole, the piston end of the piston assembly contacts the inner wall of the piston cavity, and the piston end of the piston assembly is used to move radially in the piston cavity to allow the fluid through hole to communicate through the piston through hole, or to block the communication of the fluid through hole by the piston end.

[0009] The target receiving trough is used to collect residual powder from the sand and powder fluid in the piston cavity.

[0010] As an optional implementation, in an embodiment of the first aspect of this utility model, the target storage slot includes a first storage slot and a second storage slot, and the on / off component includes:

[0011] The outer shell has the piston cavity. A first fixing groove and a first receiving groove are provided on the first inner surface of the piston cavity. A second fixing groove and a second receiving groove are provided on the second inner surface of the piston cavity. The first inner surface and the second inner surface are two inner surfaces opposite to the piston cavity. The first receiving groove is connected to the first fixing groove, and the second receiving groove is connected to the second fixing groove.

[0012] A first sealing element is disposed in the first fixing groove, and the first sealing element has a first through hole, which communicates with the sandblasting guide pipe body.

[0013] The second sealing element is disposed in the second fixing groove and has a second through hole, which communicates with the sandblasting guide pipe body.

[0014] The piston end of the piston assembly contacts the first seal and the second seal respectively. The piston end of the piston assembly is used to move in the piston cavity to make the first through hole and the second through hole communicate through the piston through hole, or to make the piston end block the communication between the first through hole and the second through hole. The first storage groove and the second storage groove of the outer shell are both used to collect the residual powder of the sand and powder fluid in the piston cavity.

[0015] As an optional implementation, in an embodiment of the first aspect of the present invention, the first storage groove includes a first sub-storage groove and a second sub-storage groove. The first sub-storage groove is disposed at a first end of the first fixing groove, and the second sub-storage groove is disposed at a second end of the first fixing groove. The first end and the second end of the first fixing groove are opposite ends of the first fixing groove in the radial direction of the piston cavity.

[0016] As an optional implementation, in an embodiment of the first aspect of the present invention, the second storage groove includes a third sub-storage groove and a fourth sub-storage groove. The third sub-storage groove is disposed at the first end of the second fixing groove, and the fourth sub-storage groove is disposed at the second end of the second fixing groove. The first end and the second end of the second fixing groove are opposite ends of the second fixing groove in the radial direction of the piston cavity.

[0017] As an optional implementation, in an embodiment of the first aspect of this utility model, the outer casing includes:

[0018] The first base has a third through hole, and the connecting side of the first base is provided with a first piston groove. The inner surface of the first piston groove is provided with a first fixing groove and a first receiving groove. The third through hole communicates with the first fixing groove, and the first through hole of the first seal is opposite to the third through hole of the first base.

[0019] 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 receiving groove on its inner surface. The fourth through hole communicates with the second fixing groove, and the second through hole of the second seal is opposite to the fourth through hole of the second base.

[0020] The connecting side of the first base is disposed opposite to the connecting side of the second base, and the connecting side of the first base is connected to the connecting side of the second base, so that the first piston groove and the second piston groove form the piston cavity.

[0021] As an optional implementation, in an embodiment of the first aspect of this utility model, the structure further includes:

[0022] 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 seal respectively.

[0023] 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 first seal respectively.

[0024] As an optional implementation, in an embodiment of the first aspect of this invention, the piston assembly includes:

[0025] A cylinder block having a pressure chamber;

[0026] A piston rod body has a piston through hole at its piston end. The piston rod body is disposed in the pneumatic chamber. The outer shell body is disposed in the pneumatic chamber at one end near the piston end of the piston rod body. The piston end of the piston rod body is in contact with the first sealing element and the second sealing element, respectively.

[0027] The cylinder body is used to control the air pressure in the air chamber to push the piston end 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, or the piston end blocks the connection between the first through hole and the second through hole.

[0028] As an optional implementation, in an embodiment of the first aspect of this utility model, the plug body includes:

[0029] A stopper rod base is disposed inside the air pressure chamber, and the circumferential direction of the stopper rod base contacts the inner wall of the air pressure chamber to seal the air pressure chamber;

[0030] A stopper rod body is disposed on the side of the stopper rod base away from the interior of the air pressure chamber, and the stopper rod body has a fixed through cavity;

[0031] A sealing sheet having a piston through hole, the sealing sheet being disposed in the fixed through cavity, a first side of the sealing sheet contacting the first sealing element, and a second side of the sealing sheet contacting the second sealing element, wherein the first side and the second side of the sealing sheet are two opposite sides of the sealing sheet;

[0032] The cylinder body is used to push the piston rod base by controlling the air pressure in the air pressure chamber, 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, or the piston end blocks the connection between the first through hole and the second through hole.

[0033] As an optional implementation, in an embodiment of the first aspect of this utility model, the constituent materials of the sealing sheet, the first sealing element, and the second sealing element are all ceramic materials.

[0034] Secondly, this utility model discloses a dental air-blasting device, the device comprising:

[0035] The fluid on / off structure as described in the first aspect of this utility model;

[0036] A piston controller is connected to the piston assembly and is used to control the movement of the piston end of the piston assembly in the piston cavity;

[0037] The sandblasting guide pipe body is connected to the fluid through hole of the on / off assembly.

[0038] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0039] The fluid switching structure provided by this utility model, by setting a target collection groove on the inner wall of the piston cavity of the switching component, when the piston end of the piston assembly moves radially in the piston cavity, can squeeze the residual powder of the sand and powder fluid between the piston end and the inner wall of the piston cavity into the target collection groove. The target collection groove can collect the residual powder of the sand and powder fluid, thereby reducing the influence of the powder of the sand and powder fluid on the movement of the piston end of the piston assembly in the piston cavity, thereby improving the accuracy of controlling the switching of the sand and powder fluid.

[0040] The dental sandblasting device provided by this utility model adopts the above-mentioned fluid on / off structure. By setting a target collection groove on the inner wall of the piston cavity of the on / off component, when the piston end of the piston assembly moves radially in the piston cavity, the residual powder of the sand powder fluid between the piston end and the inner wall of the piston cavity can be squeezed into the target collection groove. The target collection groove can collect the residual powder of the sand powder fluid, thereby reducing the influence of the sand powder fluid on the movement of the piston end of the piston assembly in the piston cavity, thereby improving the accuracy of controlling the on / off of the sand powder fluid. Attached Figure Description

[0041] Figure 1 This is a schematic diagram of a specific embodiment of the fluid on / off structure in this utility model;

[0042] Figure 2 This is a schematic diagram of another specific embodiment of the fluid on / off structure in this utility model;

[0043] Figure 3 This is a schematic diagram of the structure of the first base and the first sealing element in the fluid switching structure of this utility model;

[0044] Figure 4 This is a schematic diagram of the second base and the second sealing element in the fluid flow switching structure of this utility model;

[0045] Figure 5 This is a cross-sectional structural diagram of a specific embodiment of the fluid flow switching structure of this utility model.

[0046] The meanings of the reference numerals in the attached figures are as follows:

[0047] The components include: on / off assembly 100, housing 110, first base 111, second base 112, first seal 120, second seal 130, piston assembly 200, cylinder body 210, piston rod body 220, piston rod base 221, piston rod body 222, sealing plate 223, first flow guide joint 300, and second flow guide joint 400. Detailed Implementation

[0048] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0049] In this invention, 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 invention 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.

[0050] Furthermore, in addition to indicating direction 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 utility model according to the specific circumstances.

[0051] 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 utility model based on the specific circumstances.

[0052] 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.

[0053] The technical solution of this utility model will be further described below with reference to the embodiments and accompanying drawings.

[0054] Currently, in dentistry, air polishing involves using compressed air to propel air polishing powder onto the tooth surface. This powder, combined with a liquid medium, uses kinetic energy to impact plaque and tartar on the tooth surface, thus cleaning the teeth.

[0055] In practical applications, dental blasting equipment needs to be able to quickly control the start and stop of blasting powder. Therefore, a fluid flow control structure is required between the powder chamber and the nozzle in the dental blasting equipment. This fluid flow control structure uses air pressure to push the piston end of the piston assembly to move within the piston cavity of the flow control component, controlling whether the through hole on the piston end can communicate with the through hole of the flow control component, thereby controlling the flow of powder fluid.

[0056] However, in actual operation, after repeatedly controlling the flow of sand and powder fluid, sand and powder particles can enter between the piston end of the piston assembly and the inner wall of the on / off component. This increases the friction between the piston end and the inner wall of the on / off component, affecting the movement of the piston end within the piston cavity and resulting in low accuracy in controlling the flow of sand and powder fluid. Therefore, reducing the impact of sand and powder particles on the movement of the piston end within the piston cavity to improve the accuracy of controlling the flow of sand and powder fluid has become an urgent problem to be solved.

[0057] In response, this utility model discloses a fluid flow control structure and a dental sandblasting device, which can reduce the influence of the sand powder fluid on the piston end of the piston assembly moving in the piston cavity, thereby improving the accuracy of controlling the flow of sand powder fluid.

[0058] like Figure 1 As shown, this utility model discloses a fluid flow control structure, which includes a flow control component 100 and a piston assembly 200. The flow control component 100 has a piston cavity, and a fluid through-hole is provided in the radial direction perpendicular to the piston cavity. The fluid through-hole communicates with the piston cavity, and a target collection groove is provided on the inner wall of the piston cavity. The fluid through-hole communicates with an external sandblasting guide pipe; wherein, the sandblasting guide pipe is used to transport sand powder fluid. The piston end of the piston assembly 200 has a piston through-hole, and the piston end of the piston assembly 200 contacts the inner wall of the piston cavity. The piston end of the piston assembly 200 is used to move radially in the piston cavity to allow the fluid through-hole to communicate, or to block the communication of the fluid through-hole; wherein, the target collection groove is used to collect residual powder of the sand powder fluid in the piston cavity.

[0059] In this embodiment, refer to Figure 1The on / off assembly 100 has a piston cavity arranged vertically, with both the upper and lower ends of the piston cavity communicating with the outside of the on / off assembly 100. The on / off assembly 100 has fluid through holes in the left and right directions, which are divided into a left through hole and a right through hole. Both the left and right through holes of the fluid through hole communicate with the middle piston cavity, and the fluid through holes are connected to the external sandblasting guide pipe.

[0060] The top of the piston assembly 200 is the piston end. The piston end of the piston assembly 200 has piston through holes on its left and right sides. The piston end of the piston assembly 200 is located within the piston cavity and contacts the inner wall of the piston cavity. The piston end of the piston assembly 200 can move up and down within the piston cavity. If the piston through hole on the piston end is aligned with the fluid through hole, the left and right through holes of the fluid through hole are connected through the piston through hole on the piston end, allowing the sand powder fluid to flow through the fluid through hole. If the piston through hole on the piston end is not aligned with the fluid through hole, the non-through hole portion of the piston end can block the connection between the left and right through holes of the fluid through hole, preventing the sand powder fluid from flowing through the fluid through hole.

[0061] The on / off assembly 100 has a target collection groove on the inner wall of the piston cavity. The target collection groove is connected to the piston cavity. When the piston end of the piston assembly 200 moves up and down in the piston cavity, it can push the residual powder of the sand and powder fluid between the piston end and the inner wall of the piston cavity into the target collection groove. That is, the target collection groove can collect the residual powder of the sand and powder fluid, thereby reducing the friction between the piston end of the piston assembly 200 and the inner wall of the on / off assembly 100. This reduces the influence of the sand and powder fluid powder on the movement of the piston end of the piston assembly 200 in the piston cavity, thereby improving the accuracy of controlling the on / off of the sand and powder fluid.

[0062] As can be seen, the fluid switching structure of this utility model can, by setting a target collection groove on the inner wall of the piston cavity of the switching component 100, squeeze the residual powder of the sand and powder fluid between the piston end and the inner wall of the piston cavity into the target collection groove when the piston end of the piston assembly 200 moves radially in the piston cavity. That is, the target collection groove can collect the residual powder of the sand and powder fluid, thereby reducing the influence of the powder of the sand and powder fluid on the movement of the piston end of the piston assembly 200 in the piston cavity, thereby improving the accuracy of controlling the switching of the sand and powder fluid.

[0063] like Figure 2As shown, in an optional embodiment, the target storage slot includes a first storage slot and a second storage slot, and the on / off assembly 100 includes: a housing 110, a first seal 120, and a second seal 130. The housing 110 has a piston cavity, with a first fixing groove and a first storage slot on the first inner surface of the piston cavity, and a second fixing groove and a second storage slot on the second inner surface of the piston cavity. The first inner surface and the second inner surface are two opposing inner surfaces of the piston cavity. The first storage slot communicates with the first fixing groove, and the second storage slot communicates with the second fixing groove. The first seal 120 is disposed in the first fixing groove and has a first through hole communicating with the sandblasting guide pipe. The second seal 130 is disposed in the second fixing groove. In the groove, the second seal 130 has a second through hole, which communicates with the sandblasting guide tube body; wherein, the piston end of the piston assembly 200 contacts the first seal 120 and the second seal 130 respectively, and the piston end of the piston assembly 200 is used to move in the piston cavity to make the first through hole and the second through hole communicate through the piston through hole, or to make the piston end block the communication between the first through hole and the second through hole; the first receiving groove and the second receiving groove of the outer shell 110 are both used to collect residual powder of the sand powder fluid in the piston cavity.

[0064] In this optional embodiment, refer to Figure 2 The outer casing 110 has a vertically extending piston cavity, the upper and lower ends of which are connected to the outside of the outer casing 110. The left and right inner walls of the outer casing 110 are respectively the first inner surface and the second inner surface of the piston cavity, that is, the first inner surface and the second inner surface of the piston cavity are two opposing inner surfaces of the piston cavity. The first inner surface is provided with a first fixing groove and a first receiving groove, and the second inner surface is provided with a second fixing groove and a second receiving groove. The first receiving groove is connected to the first fixing groove, and the second receiving groove is connected to the second fixing groove.

[0065] The first seal 120 is disposed in the first fixing groove of the first inner surface, and the right side surface of the first seal 120 is the sealing surface of the first seal 120. The second seal 130 is disposed in the second fixing groove of the second inner surface, and the left side surface of the second seal 130 is the sealing surface of the second seal 130. The piston end of the piston assembly 200 contacts the sealing surfaces of the first seal 120 and the second seal 130 respectively. The first through hole of the first seal 120 and the second through hole of the second seal 130 are arranged correspondingly to each other in the left-right lateral direction.

[0066] When the piston through-hole on the piston end of the piston assembly 200 is misaligned with the first through-hole of the first seal 120 and the second through-hole of the second seal 130, the piston end will block the communication between the first and second through-holes, preventing the sand powder fluid from flowing from the first through-hole through the second through-hole or vice versa. When the piston through-hole on the piston end of the piston assembly 200 is aligned with the first through-hole of the first seal 120 and the second through-hole of the second seal 130, that is, the first and second through-holes can be connected through the piston through-hole of the sealing plate 223, the sand powder fluid can flow through the first through-hole, the piston through-hole, and the second through-hole.

[0067] When the piston end of the piston assembly 200 moves up and down in the piston cavity, it can push the residual powder of the sand and powder fluid between the piston end and the first inner surface of the piston cavity into the first receiving groove, and push the residual powder of the sand and powder fluid between the piston end and the second inner surface of the piston cavity into the second receiving groove. This reduces the friction between the piston end of the piston assembly 200 and the first and second inner surfaces, thereby further reducing the influence of the sand and powder fluid powder on the movement of the piston end of the piston assembly 200 in the piston cavity.

[0068] As can be seen, this optional embodiment can also collect residual powder of sand and powder fluid through the first and second collection grooves, thereby reducing the friction between the piston end of the piston assembly 200 and the first and second inner surfaces, respectively, thereby further reducing the influence of the powder of sand and powder fluid on the movement of the piston end of the piston assembly 200 in the piston cavity, and thus further improving the accuracy of controlling the on / off of sand and powder fluid.

[0069] like Figure 3 As shown, in an optional embodiment, 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.

[0070] In this optional embodiment, refer to Figure 3 The upper end of the first fixed groove is provided with a first sub-storage groove, and the lower end of the first fixed end is provided with a second sub-storage groove. Both the first and second sub-storage grooves are connected to the first fixed groove. It can be understood that the size and shape of the first and second sub-storage grooves can be configured according to the actual needs for storing residual powder, such as... Figure 3 Both the first and second sub-storage slots can be horizontally arranged elliptical grooves.

[0071] When the first seal 120 is disposed in the first fixed groove, the upper first sub-receiving groove is divided into a left groove and a right groove, and the lower second sub-receiving groove is also divided into a left groove and a right groove. When the piston end of the piston assembly 200 moves upward relative to the outer shell 110 in the piston cavity, it can push the residual powder of the sand and powder fluid between the piston end and the first inner surface of the piston cavity into the upper first sub-receiving groove; when the piston end of the piston assembly 200 moves downward relative to the outer shell 110 in the piston cavity, it can push the residual powder of the sand and powder fluid between the piston end and the first inner surface of the piston cavity into the lower second sub-receiving groove.

[0072] Meanwhile, by setting the first sub-storage groove and the second sub-storage groove, the contact area between the first sealing member 120 and the inner wall of the first fixing groove is reduced, thereby reducing the friction between the first sealing member 120 and the inner wall of the first fixing groove, so that the first sealing member 120 can move smoothly in the radial direction of the first fixing groove, which facilitates the disassembly, maintenance and upkeep of the first sealing member 120.

[0073] As can be seen, this optional embodiment can also collect residual powder of the sand-powder fluid between the piston end and the first inner surface of the piston cavity through the first and second sub-collecting grooves, thereby further reducing the influence of the sand-powder fluid powder on the movement of the piston end of the piston assembly 200 in the piston cavity, and thus further improving the accuracy of controlling the flow of the sand-powder fluid. At the same time, by setting the first and second sub-collecting grooves, the friction between the first seal 120 and the inner wall of the first fixing groove can also be reduced, so that the first seal 120 can move smoothly in the radial direction of the first fixing groove, which facilitates the disassembly, maintenance and repair of the first seal 120.

[0074] like Figure 4 As shown, in an optional embodiment, 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.

[0075] In this optional embodiment, refer to Figure 4 The upper end of the second fixing groove is provided with a third sub-storage groove, and the lower end of the second fixing groove is provided with a fourth sub-storage groove. Both the third and fourth sub-storage grooves are connected to the second fixing groove. It can be understood that the size and shape of the third and fourth sub-storage grooves can be configured according to the actual needs for storing residual powder, such as... Figure 4 Both the third and fourth sub-storage slots can be horizontally arranged elliptical grooves.

[0076] When the second seal 130 is disposed in the second fixed groove, the upper third sub-receiving groove is divided into a left groove and a right groove, and the lower fourth sub-receiving groove is also divided into a left groove and a right groove. When the piston end of the piston assembly 200 moves upward relative to the outer shell 110 in the piston cavity, it can push the residual powder of the sand and powder fluid between the piston end and the second inner surface of the piston cavity into the upper third sub-receiving groove; when the piston end of the piston assembly 200 moves downward relative to the outer shell 110 in the piston cavity, it can push the residual powder of the sand and powder fluid between the piston end and the second inner surface of the piston cavity into the lower fourth sub-receiving groove.

[0077] Meanwhile, by setting the third and fourth sub-storage slots, the contact area between the second seal 130 and the inner wall of the second fixing slot is reduced, thereby reducing the friction between the second seal 130 and the inner wall of the second fixing slot, so that the second seal 130 can move smoothly in the radial direction of the second fixing slot, which facilitates the disassembly, maintenance and upkeep of the second seal 130.

[0078] As can be seen, this optional embodiment can also collect residual powder of the sand-powder fluid between the piston end and the second inner surface of the piston cavity through the third and fourth sub-collection grooves, thereby further reducing the influence of the sand-powder fluid powder on the movement of the piston end of the piston assembly 200 in the piston cavity, and thus further improving the accuracy of controlling the on / off of the sand-powder fluid. At the same time, by providing the third and fourth sub-collection grooves, the friction between the second seal 130 and the inner wall of the second fixing groove can also be reduced, so that the second seal 130 can move smoothly in the radial direction of the second fixing groove, which facilitates the disassembly, maintenance and upkeep of the second seal 130.

[0079] like Figure 5 As shown, in an optional embodiment, the outer casing 110 includes: a first base 111 and a second base 112. The first base 111 has a third through hole, and a first piston groove is provided on the connecting side of the first base 111. A first fixing groove and a first receiving groove are provided on the inner surface of the first piston groove. The third through hole communicates with the first fixing groove, and the first through hole of the first sealing member 120 is opposite to the third through hole of the first base 111. The second base 112 has a fourth through hole, and a second piston groove is provided on the connecting side of the second base 112. A second fixing groove and a second receiving groove are provided on the inner surface of the second piston groove. The fourth through hole communicates with the second fixing groove, and the second through hole of the second sealing member 130 is opposite to the fourth through hole of the second base 112. The connecting side of the first base 111 is opposite to the connecting side of the second base 112, and the connecting side of the first base 111 is connected to the connecting side of the second base 112, so that the first piston groove and the second piston groove form a piston cavity.

[0080] In this optional embodiment, refer to Figure 5The outer casing 110 can be divided into a first base 111 on the left side and a second base 112 on the right side. The connecting side of the first base 111 is located on the right side of the first base 111, and the connecting side of the first base 111 is provided with a first piston groove, a first sub-storage groove and a second sub-storage groove. A first sealing element 120 is provided in the first piston groove. The connecting side of the second base 112 is located on the left side of the second base 112, and the connecting side of the second base 112 is provided with a second piston groove, a third sub-storage groove and a fourth sub-storage groove. A second sealing element 130 is provided in the second piston groove.

[0081] The connecting side of the first base 111 is connected to the connecting side of the second base 112, so that the first piston groove of the first base 111 and the second piston groove of the second base 112 enclose the piston cavity, that is, the piston end of the piston assembly 200 can move up and down in the first piston groove and the second piston groove.

[0082] Furthermore, the first base 111 is also provided with a third through hole, and the third through hole of the first base 111 is opposite to and communicates with the first through hole of the first seal 120. The second base 112 is also provided with a fourth through hole, and the fourth through hole of the second base 112 is opposite to and communicates with the second through hole of the second seal 130.

[0083] When setting the first, second, third, and fourth sub-storage slots, it is important to ensure that the swing angle of the first seal 120 in the radial direction of the first fixed slot is ≤5 degrees, so as to ensure the positional accuracy between the center of the first through hole of the first seal 120 and the center of the third through hole of the first base 111, and to ensure that the swing angle of the second seal 130 in the radial direction of the second fixed slot is ≤5 degrees, so as to ensure the positional accuracy between the center of the second through hole of the second seal 130 and the center of the fourth through hole of the second base 112.

[0084] As can be seen, this optional embodiment can also form a piston cavity by the first piston groove of the first base 111 and the second piston groove of the second base 112, so that the piston end of the piston assembly 200 can move in the first piston groove and the second piston groove.

[0085] like Figure 5 As shown, in an optional embodiment, the fluid flow control structure further includes a first flow guide connector 300 and a second flow guide connector 400. The first flow guide connector 300 is disposed at the third through hole of the first base 111, and the interface of the first flow guide connector 300 is connected to the third through hole of the first base 111 and the first through hole of the first seal 120, respectively; the second flow guide connector 400 is disposed at the fourth through hole of the second base 112, and the interface of the second flow guide connector 400 is connected to the fourth through hole of the second base 112 and the second through hole of the first seal 120, respectively.

[0086] In this optional embodiment, the first flow guide 300 is connected to the third through hole of the first base 111, so that the interface of the first flow guide 300 communicates with the third through hole of the first base 111 and the first through hole of the first seal 120, respectively. The second flow guide 400 is connected to the fourth through hole of the second base 112, so that the interface of the second flow guide 400 communicates with the fourth through hole of the second base 112 and the second through hole of the second seal 130, respectively. The first flow guide 300 and the second flow guide 400 can be connected to an external fluid guide pipe, so that the sand and powder fluid transported by the fluid guide pipe can enter and exit the fluid on / off structure.

[0087] 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 300 and the second flow guide 400, 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 transport.

[0088] like Figure 5 As shown, in an optional embodiment, the piston assembly 200 includes a cylinder body 210 and a piston rod 220. The cylinder body 210 has a pneumatic chamber inside; the piston end of the piston rod 220 has a piston through hole, the piston rod 220 is disposed in the pneumatic chamber, and the outer shell 110 is disposed in the pneumatic chamber near the piston end of the piston rod 220. The piston end of the piston rod 220 contacts the first seal 120 and the second seal 130 respectively. The cylinder body 210 is used to control the pneumatic pressure in the pneumatic chamber to push the piston end of the piston rod 220 to move in the piston cavity, so that the first through hole and the second through hole are connected through the piston through hole, or the piston end blocks the connection between the first through hole and the second through hole.

[0089] In this optional embodiment, the piston rod 220 is disposed within the pneumatic chamber of the cylinder body 210. The cylinder body 210 pressurizes the pneumatic chamber by venting air, thereby driving the piston rod 220 to move vertically up and down, which in turn drives the piston end of the piston rod 220 to move vertically up and down within the piston cavity formed by the first piston groove and the second piston groove. When the piston end of the piston rod 220 moves within the piston cavity formed by the first piston groove and the second piston groove, it can squeeze the residual powder of the sand and powder fluid between the piston end and the inner wall of the piston cavity into the first powder discharge port and the second powder discharge port, that is, it can discharge the residual powder of the sand and powder fluid from the piston cavity through the first powder discharge port and the second powder discharge port.

[0090] Since the piston end of the piston rod body 220 is provided with a piston through hole, when the piston end of the piston rod body 220 moves vertically up and down in the piston cavity, if the piston through hole on the piston end is aligned with the first through hole and the second through hole, then the first through hole and the second through hole can be connected through the piston through hole, and the sandblasting fluid can flow through the first through hole, the piston through hole and the second through hole; if the piston through hole on the piston end is not aligned with the first through hole and the second through hole, then the non-through hole part of the piston end can block the connection between the first through hole and the second through hole.

[0091] As can be seen, this optional embodiment can also push the piston rod 220 to move vertically up and down by pressurizing the air chamber through the cylinder 210, thereby driving the piston end of the piston rod 220 to move vertically up and down in the piston cavity formed by the first piston groove and the second piston groove, thereby improving the operability and accuracy of controlling the flow of fluid.

[0092] like Figure 5 As shown, in an optional embodiment, the plunger body 220 includes: a plunger base 221, a plunger body 222, and a sealing plate 223. A stopper rod base 221 is disposed within the pneumatic chamber, and its circumference contacts the inner wall of the pneumatic chamber to seal it. A stopper rod body 222 is disposed on the side of the stopper rod base 221 away from the interior of the pneumatic chamber, and the stopper rod body 222 has a fixed through cavity. A sealing plate 223 has a piston through hole and is disposed within the fixed through cavity. The first side of the sealing plate 223 contacts the first sealing member 120, and the second side of the sealing plate 223 contacts the second sealing member 130. 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 push the stopper rod base 221 by controlling the air pressure in the pneumatic chamber, thereby causing the sealing plate 223 to move in the piston cavity, so that the first through hole and the second through hole are connected through the piston through hole, or the piston end blocks the connection between the first through hole and the second through hole.

[0093] In this optional embodiment, the piston rod base 221 is disposed in the pressure chamber, and the circumference of the piston rod base 221 contacts the inner wall of the pressure chamber, so that the lower side of the piston rod base 221 seals the pressure chamber. 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-type limiting device, and its middle part has a fixed through cavity, which communicates with the outside of the piston rod body 222 through its left and right sides. 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 120, and the second side of the sealing plate 223 contacts the sealing surface of the second sealing member 130. The sealing plate 223 has a piston through hole that communicates with the left and right sides.

[0094] Furthermore, the cylinder body 210 can push the piston rod base 221 to move vertically up and down by pressurizing the air chamber, thereby driving the piston rod body 222 and the sealing plate 223 to move vertically up and down in the piston cavity formed by the first piston groove and the second piston groove. If the piston through hole of the sealing plate 223 is aligned with the first through hole and the second through hole, then the first through hole and the second through hole can be connected through the piston through hole, and the sandblasting fluid can flow through the first through hole, the piston through hole and the second through hole; if the piston through hole of the sealing plate 223 is not aligned with the first through hole and the second through hole, then the non-through hole part of the sealing plate 223 can block the connection between the first through hole and the second through hole.

[0095] 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 leave the piston cavity when it moves up and down in the piston cavity due to the limitation, thereby ensuring the reliability of the fluid flow control structure.

[0096] In an optional embodiment, the materials used to make the sealing sheet 223, the first seal 120, and the second seal 130 are all ceramic materials.

[0097] In this optional embodiment, the sealing plate 223, the first seal 120, and the second seal 130 can all be made of ceramic material. Since the sealing plate 223 rubs against the first seal 120 and the second seal 130 when it moves within the piston cavity, using a ceramic material with excellent wear resistance can effectively reduce frictional losses between the sealing plate 223 and the first seal 120 and the second seal 130, further ensuring the airtightness of the fluid flow control structure.

[0098] As can be seen, this optional embodiment can also effectively reduce the frictional loss between the sealing sheet 223 and the first sealing element 120 and the second sealing element 130 by using ceramic materials as the constituent materials of the sealing sheet 223, the first sealing element 120 and the second sealing element 130 respectively, thereby further ensuring the airtightness of the fluid flow-off structure.

[0099] This utility model also discloses a dental sandblasting device, which includes a piston controller, a sandblasting guide tube, and the fluid on / off structure described in the above embodiments of this utility model. The piston controller is connected to the piston assembly 200 and is used to control the movement of the piston end of the piston assembly 200 in the piston cavity; the sandblasting guide tube is connected to the fluid through hole of the on / off assembly 100.

[0100] In this embodiment, the sandblasting guide pipe has a front section and a rear section. The front section of the sandblasting guide pipe is connected to the third through hole of the first base 111 and the first through hole of the first seal 120 by connecting to the first guide connector 300. The rear section is connected to the fourth through hole of the second base 112 and the second through hole of the second seal 130 by connecting to the second guide connector 400.

[0101] The piston controller is connected to the cylinder body 210. The piston controller can pressurize the air chamber of the cylinder body 210 to control the vertical movement of the sealing plate 223 in the piston cavity formed by the first piston groove and the second piston groove. The sandblasting guide pipe can transport sandblasting fluid. When the piston through hole of the sealing plate 223 is aligned with the first through hole and the second through hole, the first through hole and the second through hole can be connected through the piston through hole. The sandblasting fluid transported by the front section of the pipe can flow through the first through hole, the piston through hole and the second through hole to the rear section of the pipe. When the piston through hole of the sealing plate 223 is not aligned with the first through hole and the second through hole, the non-through hole part of the sealing plate 223 can block the connection between the first through hole and the second through hole, and the sandblasting fluid transported by the front section of the pipe cannot be transported to the rear section of the pipe.

[0102] As can be seen, in this embodiment, the dental sandblasting device can use the above-mentioned fluid on / off structure. By setting a target collection groove on the inner wall of the piston cavity of the on / off assembly 100, when the piston end of the piston assembly 200 moves radially in the piston cavity, the residual powder of the sand powder fluid between the piston end and the inner wall of the piston cavity can be squeezed into the target collection groove. Even if the target collection groove can collect the residual powder of the sand powder fluid, the influence of the powder of the sand powder fluid on the movement of the piston end of the piston assembly 200 in the piston cavity can be reduced, thereby improving the accuracy of controlling the on / off of the sand powder fluid.

[0103] The technical means disclosed in this utility model are not limited to those disclosed in the above embodiments, but also include technical solutions composed of any combination of the above technical features. It should be noted that those skilled in the art can make various improvements and modifications without departing from the principle of this utility model, and these improvements and modifications are also considered within the scope of protection of this utility model.

Claims

1. A fluid on-off structure, characterized by, The structure comprises: A switching assembly having a piston cavity, the switching assembly being provided with a fluid passage in a vertical direction of a radial direction of the piston cavity, the fluid passage being in communication with the piston cavity, an inner wall of the piston cavity being provided with a target receiving groove, and the fluid passage being in communication with an external sandblasting flow guide tube body; wherein the sandblasting flow guide tube body is used for conveying a sand powder fluid; A piston assembly, a piston end of the piston assembly having a piston passage, the piston end of the piston assembly being in contact with the inner wall of the piston cavity, and the piston end of the piston assembly being used for moving in a radial direction of the piston cavity to make the fluid passage communicate through the piston passage or to make the piston end block the communication of the fluid passage; wherein the target receiving groove is used for collecting residual powder of the sand powder fluid in the piston cavity.

2. The fluidic on-off structure of claim 1, wherein, The target receiving groove comprises a first receiving groove and a second receiving groove, and the switching assembly comprises: An outer housing having the piston cavity, a first inner surface of the piston cavity being provided with a first fixed groove and the first receiving groove, a second inner surface of the piston cavity being provided with a second fixed groove and the second receiving groove, the first inner surface and the second inner surface being two inner surfaces opposite to each other of the piston cavity; wherein the first receiving groove is in communication with the first fixed groove, and the second receiving groove is in communication with the second fixed groove; A first sealing member arranged in the first fixed groove, the first sealing member having a first passage in communication with the sandblasting flow guide tube body; A second sealing member arranged in the second fixed groove, the second sealing member having a second passage in communication with the sandblasting flow guide tube body; wherein the piston end of the piston assembly is in contact with the first sealing member and the second sealing member respectively, the piston end of the piston assembly is used for moving in the piston cavity to make the first passage and the second passage communicate through the piston passage or to make the piston end block the communication between the first passage and the second passage; and the first receiving groove of the outer housing and the second receiving groove of the outer housing are both used for collecting residual powder of the sand powder fluid in the piston cavity.

3. The fluidic on-off structure of claim 2, wherein, The first receiving groove comprises a first sub-receiving groove and a second sub-receiving groove, the first sub-receiving groove being arranged at a first end of the first fixed groove, and the second sub-receiving groove being arranged at a second end of the first fixed groove, the first end of the first fixed groove and the second end of the first fixed groove being opposite ends of the first fixed groove in the radial direction of the piston cavity.

4. The fluidic on-off structure of claim 2, wherein, The second receiving groove comprises a third sub-receiving groove and a fourth sub-receiving groove, the third sub-receiving groove being arranged at a first end of the second fixed groove, and the fourth sub-receiving groove being arranged at a second end of the second fixed groove, the first end of the second fixed groove and the second end of the second fixed groove being opposite ends of the second fixed groove in the radial direction of the piston cavity.

5. Fluidic on-off structure according to any one of claims 2 to 4, characterized in that The outer housing comprises: The first base has a third through hole, and a first piston groove is arranged on the connecting side of the first base, and a first fixing groove and a first receiving groove are arranged on the inner surface of the first piston groove, the third through hole is communicated with the first fixing groove, and the first through hole of the first sealing element is arranged opposite to the third through hole of the first base; The second base has a fourth through hole, and a second piston groove is arranged on the connecting side of the second base, and a second fixing groove and a second receiving groove are arranged on the inner surface of the second piston groove, the fourth through hole is communicated with the second fixing groove, and the second through hole of the second sealing element is arranged opposite to the fourth through hole of the second base; The connecting side of the first base is arranged opposite to the connecting side of the second base, and the connecting side of the first base is connected with the connecting side of the second base, so that the first piston groove and the second piston groove form the piston cavity.

6. The fluidic on-off structure of claim 5, wherein, The structure further comprises: The first flow guide connector is arranged at the third through hole of the first base, and the interface of the first flow guide connector is communicated with the third through hole of the first base and the first through hole of the first sealing element respectively; The second flow guide connector is arranged at the fourth through hole of the second base, and the interface of the second flow guide connector is communicated with the fourth through hole of the second base and the second through hole of the first sealing element respectively.

7. Fluidic on-off structure according to any one of claims 2 to 4, characterized in that The piston assembly comprises: The cylinder body has a gas pressure cavity; The piston end of the plug rod body has a piston through hole, the plug rod body is arranged in the gas pressure cavity, the housing body is arranged in the gas pressure cavity and close to one end of the piston end of the plug rod body, and the piston end of the plug rod body is in contact with the first sealing element and the second sealing element respectively; The gas cylinder body is used to control the gas pressure of the gas pressure cavity to drive the piston end of the plug rod body to move in the piston cavity, so that the first through hole and the second through hole are communicated through the piston through hole, or the piston end blocks the communication between the first through hole and the second through hole.

8. The fluidic on-off structure of claim 7, wherein, The plug rod body comprises: The plug rod base is arranged in the gas pressure cavity, and the circumference of the plug rod base is in contact with the inner wall of the gas pressure cavity to seal the gas pressure cavity; The plug rod body is arranged on the side of the plug rod base away from the inside of the gas pressure cavity, and the plug rod body has a fixed through cavity; The sealing sheet has a piston through hole, the sealing sheet is arranged in the fixed through cavity, the first side surface of the sealing sheet is in contact with the first sealing element, the second side surface of the sealing sheet is in contact with the second sealing element, and the first side surface of the sealing sheet and the second side surface of the sealing sheet are opposite two side surfaces of the sealing sheet; The gas cylinder body is used to control the gas pressure of the gas pressure cavity to drive the plug rod base, so as to drive the sealing sheet to move in the piston cavity, so that the first through hole and the second through hole are communicated through the piston through hole, or the piston end blocks the communication between the first through hole and the second through hole.

9. The fluidic on-off structure of claim 8, wherein, The sealing sheet, the first seal, and the second seal are each made of a ceramic material.

10. A dental sandblasting device, characterized in that The apparatus comprises: The fluid on-off structure according to any one of claims 1 to 9; A piston controller connected to the piston assembly, the piston controller configured to control movement of a piston end of the piston assembly within the piston cavity; A sandblasting nozzle body in fluid communication with the fluid passageway of the on-off assembly.

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