Sealed fluid on-off structure and dental sand blasting equipment

Abstract

The utility model discloses a sealed type fluid on-off structure and dental sand blasting equipment, the fluid on-off structure comprises an outer shell, a first sealing assembly, a second sealing assembly and a piston assembly, a pre-pressing part of the first sealing assembly applies a pre-tightening force to a sealing surface of the first sealing assembly, and a pre-pressing part of the second sealing assembly applies a pre-tightening force to a sealing surface of the second sealing assembly; the pre-pressing part of the first sealing assembly applies pre-tightening force to the sealing face of the first sealing assembly, the pre-pressing part of the second sealing assembly applies pre-tightening force to the sealing face of the second sealing assembly, and the piston end of the piston assembly makes contact with the sealing face of the first sealing assembly and the sealing face of the second sealing assembly. The first sealing assembly and the second sealing assembly can exert pressure towards the piston end, and therefore sealing can be achieved between the first sealing assembly and the piston end and between the second sealing assembly and the piston end. According to the sealed fluid on-off structure and the dental sand blasting equipment, the air tightness of the fluid on-off structure can be improved, so that the accurate control of starting and stopping of sand blasting powder spraying is realized.

Description

TECHNICAL FIELD

[0001] The utility model relates to dental medical instrument technical field especially, relate to a sealed fluid on-off structure and dental sand blasting equipment. BACKGROUND

[0002] At present, sand blasting scaling in dentistry is through compressed air to drive sand blasting powder to spray to the tooth surface, and then combines with the liquid medium sprayed with the sand blasting powder, can impact the dental plaque and calculus on the tooth surface with certain kinetic energy, so as to achieve the effect of cleaning the tooth surface.

[0003] In practical application, the dental sand blasting equipment needs to be able to control the rapid response of the start and stop of the sand blasting powder, so a control fluid on-off structure needs to be configured between the sand powder cavity and the nozzle in the dental sand blasting equipment.

[0004] However, in actual operation, since the dental sand blasting equipment needs to push the sand blasting powder from the sand powder cavity to the nozzle by the air pressure generated by compressed air, when the sand blasting powder passes through the fluid on-off structure, the fluid on-off structure will have low air tightness under the action of the above air pressure, resulting in that the channel of the fluid on-off structure cannot be sealed when it is turned off, and the sand blasting powder will still be sprayed out, thereby causing the start and stop of the sand blasting powder cannot be accurately controlled. Therefore, how to improve the air tightness of the fluid on-off structure to realize the accurate control of the start and stop of the sand blasting powder has become a problem to be solved. UTILITY MODEL CONTENTS

[0005] The utility model embodiment discloses a sealed fluid on-off structure and dental sand blasting equipment, which can improve the air tightness of the fluid on-off structure to realize the accurate control of the start and stop of the sand blasting powder.

[0006] In order to achieve the above purpose, in the first aspect, the utility model discloses a sealed fluid on-off structure, which comprises:

[0007] The outer shell has a piston cavity;

[0008] The first sealing assembly is arranged on the first inner surface of the piston cavity, the pre-pressing part of the first sealing assembly applies a pre-tightening force to the sealing surface of the first sealing assembly, and the first sealing assembly has a first through hole;

[0009] A second sealing assembly is arranged on a second inner surface of the piston cavity, the second sealing assembly has a pre-pressing part, the pre-pressing part of the second sealing assembly applies a pre-tightening force to a sealing surface of the second sealing assembly, and the second sealing assembly has a second through hole; wherein the first inner surface and the second inner surface are two inner surfaces opposite to each other in the piston cavity, the sealing surface of the first sealing assembly and the sealing surface of the second sealing assembly are arranged opposite to each other, and the first through hole and the second through hole are arranged opposite to each other.

[0010] A piston assembly has a piston end with a piston through hole, the piston end of the piston assembly is in contact with the sealing surface of the first sealing assembly and the sealing surface of the second sealing assembly respectively, and 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 make the piston end block the communication between the first through hole and the second through hole.

[0011] As an optional implementation, in the embodiment of the first aspect of the utility model, the first sealing assembly comprises:

[0012] A first pre-pressing part is arranged on the first inner surface of the piston cavity, and the first pre-pressing part has a first sub-through hole.

[0013] A first sealing part is arranged on a side of the first pre-pressing part away from the first inner surface of the piston cavity, and the first sealing part has a second sub-through hole; wherein the first sub-through hole and the second sub-through hole are arranged opposite to each other, the first sub-through hole and the second sub-through hole communicate to form the first through hole, the sealing surface of the first sealing assembly is a sealing surface of the first sealing part, and the sealing surface of the first sealing part is a side of the first sealing part away from the first pre-pressing part.

[0014] As an optional implementation, in the embodiment of the first aspect of the utility model, the second sealing assembly comprises:

[0015] A second pre-pressing part is arranged on the second inner surface of the piston cavity, and the second pre-pressing part has a third sub-through hole.

[0016] A second seal is arranged on the side of the second pre-pressing 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 oppositely arranged, and the third sub-through hole and the fourth sub-through hole are communicated 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-pressing member; and the sealing surface of the second seal is oppositely arranged with the sealing surface of the first seal.

[0017] As an optional implementation, in the embodiment of the first aspect of the utility model, the outer shell comprises:

[0018] A first base has a third through hole, and a connecting side of the first base is provided with a first piston groove; the third through hole is communicated with the first piston groove; the first pre-pressing member and the first seal are sequentially arranged on the inner surface of the first piston groove; and the first sub-through hole of the first pre-pressing member, the second sub-through hole of the first seal and the third through hole of the first base are oppositely arranged in pairs.

[0019] A second base has a fourth through hole, and a connecting side of the second base is provided with a second piston groove; the fourth through hole is communicated with the second piston groove; the second pre-pressing member and the second seal are sequentially arranged on the inner surface of the second piston groove; and the third sub-through hole of the second pre-pressing member, the fourth sub-through hole of the second seal and the fourth through hole of the second base are oppositely arranged.

[0020] Wherein, the connecting side of the first base is oppositely arranged with 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.

[0021] As an optional implementation, in the embodiment of the first aspect of the utility model, the inner surface of the first piston groove of the first base is provided with a first fixing groove; the third through hole is communicated with the first fixing groove; the first pre-pressing member and the first seal are sequentially arranged in the first fixing groove; and the sealing surface of the first seal is flush with the inner surface of the first piston groove.

[0022] The inner surface of the second piston groove of the second base is provided with a second fixing groove; the fourth through hole is communicated with the second fixing groove; the second pre-pressing member and the second seal are sequentially arranged in the second fixing groove; and the sealing surface of the second seal is flush with the inner surface of the second piston groove.

[0023] As an optional implementation, in the embodiment of the first aspect of the utility model, the structure further comprises:

[0024] The first flow guide joint is arranged at the third through hole of the first base, and the interfaces of the first flow guide joint are respectively communicated with the third through hole of the first base, the first sub-through hole of the first pre-pressing part and the second sub-through hole of the first sealing part;

[0025] The second flow guide joint is arranged at the fourth through hole of the second base, and the interfaces of the second flow guide joint are respectively communicated with the fourth through hole of the second base, the third sub-through hole of the second pre-pressing part and the fourth sub-through hole of the second sealing part.

[0026] As an optional implementation, in the embodiment of the first aspect of the utility model, the constituent material of the first pre-pressing part and the constituent material of the second pre-pressing part are respectively soft material or elastic material.

[0027] As an optional implementation, in the embodiment of the first aspect of the utility model, the piston assembly comprises:

[0028] The cylinder body has a gas pressure cavity;

[0029] The piston rod body has a piston through hole at the piston end, the piston rod body is arranged in the gas pressure cavity, and the piston end of the piston rod body is respectively in contact with the sealing surface of the first sealing assembly and the sealing surface of the second sealing assembly;

[0030] The cylinder body is used to control the gas pressure of the gas pressure cavity to drive 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 communicated through the piston through hole, or the piston end blocks the communication between the first through hole and the second through hole.

[0031] As an optional implementation, in the embodiment of the first aspect of the utility model, the piston rod body comprises:

[0032] The piston rod base is arranged in the gas pressure cavity, and the circumference of the piston rod base is in contact with the inner wall of the gas pressure cavity to seal the gas pressure cavity;

[0033] The piston rod body is arranged on the side of the piston rod base away from the inside of the gas pressure cavity, and the piston rod body has a fixed through cavity;

[0034] A sealing sheet having a piston through hole, the sealing sheet is arranged in the fixed through cavity, a first side of the sealing sheet is in contact with a sealing surface of the first sealing assembly, a second side of the sealing sheet is in contact with a sealing surface of the second sealing assembly, the first side of the sealing sheet and the second side of the sealing sheet are two opposite sides of the sealing sheet;

[0035] Wherein, the cylinder body is used for pushing the plug rod base by controlling the air pressure of the air pressure cavity, 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.

[0036] Secondly, the utility model discloses a dental sand blasting equipment, the equipment includes:

[0037] The sealing type fluid on-off structure as claimed in the first aspect of the utility model;

[0038] A piston controller is connected with the piston assembly, and is used for controlling the movement of the piston end of the piston assembly in the piston cavity.

[0039] A sand blasting flow guide pipe body is communicated with the first through hole of the first sealing assembly and the second through hole of the second sealing assembly respectively.

[0040] Compared with the prior art, the utility model has the beneficial effects that:

[0041] The sealing type fluid on-off structure provided by the utility model has the following advantages: the pre-pressing part of the first sealing assembly exerts a pre-tightening force on the sealing surface of the first sealing assembly, the pre-pressing part of the second sealing assembly exerts a pre-tightening force on the sealing surface of the second sealing assembly, the piston end of the piston assembly is in contact with the sealing surface of the first sealing assembly and the sealing surface of the second sealing assembly respectively, and the pre-tightening force of the first sealing assembly and the second sealing assembly enables the first sealing assembly and the second sealing assembly to exert a pre-tightening force towards the piston end, so that the first sealing assembly and the second sealing assembly can be sealed with the piston end respectively, thereby improving the air tightness of the fluid on-off structure and realizing accurate control of the starting and stopping of the sand blasting powder.

[0042] The dental sand blasting equipment provided by the utility model has the advantages that the sealing type fluid on-off structure is adopted, the pre-tightening part of the first sealing assembly exerts a pre-tightening force on the sealing surface of the first sealing assembly, the pre-tightening part of the second sealing assembly exerts a pre-tightening force on the sealing surface of the second sealing assembly, the piston end of the piston assembly is in contact with the sealing surface of the first sealing assembly and the sealing surface of the second sealing assembly respectively, the pre-tightening force of the first sealing assembly and the second sealing assembly enables the first sealing assembly and the second sealing assembly to exert a pre-tightening force towards the piston end, and the first sealing assembly and the second sealing assembly can be sealed from the piston end, thereby improving the air tightness of the fluid on-off structure and realizing accurate control of the dental sand blasting equipment on the starting and stopping of the sand blasting powder. BRIEF DESCRIPTION OF DRAWINGS

[0043] Figure 1 It is a structure schematic view of the sealing type fluid on-off structure in the utility model;

[0044] Figure 2 It is a structure schematic view of the first pre-tightening part and the first sealing part of the sealing type fluid on-off structure in the utility model;

[0045] Figure 3 It is a structure schematic view of the second pre-tightening part and the second sealing part of the sealing type fluid on-off structure in the utility model;

[0046] Figure 4 It is a sectional structure schematic view of one specific embodiment of the sealing type fluid on-off structure in the utility model;

[0047] Figure 5 It is a structure view of the plug rod body in the sealing type fluid on-off structure in the utility model.

[0048] Among them, the meaning of the reference signs is as follows:

[0049] The shell body 100, the first base 101, the second base 102, the first sealing assembly 200, the first pre-tightening part 201, the first sealing part 202, the second sealing assembly 300, the second pre-tightening part 301, the second sealing part 302, the piston assembly 400, the cylinder body 410, the plug rod body 420, the plug rod base 421, the plug rod body 422, the sealing sheet 423, the first flow guide connector 500, the second flow guide connector 600. DETAILED DESCRIPTION

[0050] The technical solutions in the embodiments of the present application will be clearly and completely described with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative labor fall within the scope of the present application.

[0051] In the present application, the terms "upper", "lower", "left", "right", "front", "back", "top", "bottom", "inner", "outer", "middle", "vertical", "horizontal", "lateral", "longitudinal" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings. These terms are mainly used to better describe the present application and its embodiments, and are not used to limit the indicated devices, elements or components to necessarily have a specific orientation, or to be constructed and operated in a specific orientation.

[0052] In addition, in addition to being used to indicate the orientation or positional relationship, the above-mentioned terms can also be used to indicate other meanings, for example, the term "upper" can also be used to indicate a certain dependent relationship or connection relationship in some cases. For those of ordinary skill in the art, the specific meaning of these terms in the present application can be understood according to the specific circumstances.

[0053] In addition, the terms "mounting", "setting", "providing", "connecting", "connecting" should be broadly understood. For example, it can be fixedly connected, detachably connected, or integrally constructed; it can be mechanically connected, or electrically connected; it can be directly connected, or indirectly connected through an intermediate medium, or internal communication between two devices, elements or components. For those of ordinary skill in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0054] In addition, the terms "first", "second" and the like are mainly used to distinguish different devices, elements or components (the specific types and structures can be the same or different), and are not used to indicate or imply the relative importance and quantity of the indicated devices, elements or components. Unless otherwise stated, the meaning of "multiple" is two or more.

[0055] The technical solutions of the present application will be further described below with reference to the embodiments and drawings.

[0056] At present, sandblasting and scaling in dentistry is achieved by spraying sandblasting powder onto the tooth surface driven by compressed air, and then combining with the liquid medium sprayed with the sandblasting powder to impact the dental plaque and dental calculus on the tooth surface with a certain kinetic energy, so as to clean the tooth surface.

[0057] In practical applications, the dental sandblasting equipment needs to be able to control the start and stop of the sandblasting powder with fast response, so a structure for controlling the on-off of the fluid needs to be arranged between the sand powder cavity and the nozzle in the dental sandblasting equipment.

[0058] However, in actual operation, since the dental sandblasting equipment needs to use the air pressure generated by compressed air to push the sandblasting powder from the sand powder cavity to the nozzle, under the action of the above-mentioned air pressure, the fluid on-off structure will have low air tightness when the sandblasting powder passes through the fluid on-off structure, resulting in that the channel of the fluid on-off structure cannot be sealed when it is turned off, and the sandblasting powder will still be sprayed out, thereby causing the start and stop of the sandblasting powder cannot be accurately controlled. Therefore, how to improve the air tightness of the fluid on-off structure to accurately control the start and stop of the sandblasting powder has become a problem to be solved.

[0059] To this end, the utility model discloses a sealed fluid on-off structure and dental sandblasting equipment, which can improve the air tightness of the fluid on-off structure to accurately control the start and stop of the sandblasting powder.

[0060] As shown in Figure 1 The utility model discloses a sealed fluid on-off structure, which comprises an outer shell 100, a first sealing assembly 200, a second sealing assembly 300 and a piston assembly 400. The outer shell 100 has a piston cavity. The first sealing assembly 200 is arranged on the first inner surface of the piston cavity. The first sealing assembly 200 has a pre-pressing part. The pre-pressing part of the first sealing assembly 200 applies a pre-tightening force to the sealing surface of the first sealing assembly 200. The first sealing assembly 200 has a first through hole. The second sealing assembly 300 is arranged on the second inner surface of the piston cavity. The second sealing assembly 300 has a pre-pressing part. The pre-pressing part of the second sealing assembly 300 applies a pre-tightening force to the sealing surface of the second sealing assembly 300. The second sealing assembly 300 has a second through hole. The first inner surface and the second inner surface are two opposite inner surfaces of the piston cavity. The sealing surface of the first sealing assembly 200 and the sealing surface of the second sealing assembly 300 are oppositely arranged. The first through hole and the second through hole are oppositely arranged. The piston end of the piston assembly 400 has a piston through hole. The piston end of the piston assembly 400 is in contact with the sealing surface of the first sealing assembly 200 and the sealing surface of the second sealing assembly 300 respectively. The piston end of the piston assembly 400 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 block the communication between the first through hole and the second through hole.

[0061] In this embodiment, refer to Figure 1The outer shell 100 has a piston cavity longitudinally extending from top to bottom, and the top end and the bottom end of the piston cavity are communicated with the outside of the outer shell 100. The left and right inner walls of the outer shell 100 are respectively the first inner surface and the second inner surface of the piston cavity, i.e. the first inner surface and the second inner surface of the piston cavity are two inner surfaces opposite to each other.

[0062] The first sealing assembly 200 is arranged on the first inner surface of the piston cavity, and the pre-pressing part of the first sealing assembly 200 is located on the left side of the first sealing assembly 200. The sealing surface of the first sealing assembly 200 is the right side surface of the first sealing assembly 200. The second sealing assembly 300 is arranged on the second inner surface of the piston cavity, and the pre-pressing part of the second sealing assembly 300 is located on the right side of the second sealing assembly 300. The sealing surface of the second sealing assembly 300 is the left side surface of the second sealing assembly 300. The first through hole of the first sealing assembly 200 and the second through hole of the second sealing assembly 300 are arranged corresponding to each other in the left-right transverse direction.

[0063] Further, the piston end of the piston assembly 400 has a piston through hole arranged in the left-right transverse direction. The cavity shape of the piston cavity is determined by the shape of the piston end of the piston assembly 400, i.e. the cavity shape of the piston cavity needs to conform to the shape of the piston end of the piston assembly 400, so that the piston end of the piston assembly 400 can move up and down in the piston cavity, and the piston end of the piston assembly 400 can be in contact with the sealing surface of the first sealing assembly 200 and the sealing surface of the second sealing assembly 300 respectively during the movement.

[0064] When the piston end of the piston assembly 400 moves 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, at this time the first through hole and the second through hole can be communicated through the piston through hole, and the 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, the non-through hole part of the piston end can block the communication between the first through hole and the second through hole.

[0065] Further, the first sealing assembly 200 is arranged with the pre-pressing portion thereof towards the first inner surface of the piston cavity, so that the sealing surface of the first sealing assembly 200 can be subjected to a right pre-tightening force, and the second sealing assembly 300 is arranged with the pre-pressing portion thereof towards the second inner surface of the piston cavity, so that the sealing surface of the second sealing assembly 300 can be subjected to a left pre-tightening force. Since the piston end of the piston assembly 400 can be in contact with the sealing surface of the first sealing assembly 200 and the sealing surface of the second sealing assembly 300 respectively, the first sealing assembly 200 and the second sealing assembly 300 can apply pressure to the piston end of the piston assembly 400. In summary, whether the piston assembly 400 is in a motion state or not, the first sealing assembly 200 and the second sealing assembly 300 can be pre-pressed onto the piston end of the piston assembly 400, so that the first sealing assembly 200 and the second sealing assembly 300 can be sealed with the piston end respectively, thereby improving the air tightness of the fluid on-off structure.

[0066] It can be seen that the sealing type fluid on-off structure can be arranged with the pre-pressing portion of the first sealing assembly 200 towards the first inner surface of the piston cavity, the pre-pressing portion of the second sealing assembly 300 towards the second inner surface of the piston cavity, and the piston end of the piston assembly 400 in contact with the sealing surface of the first sealing assembly 200 and the sealing surface of the second sealing assembly 300 respectively. Through the pre-pressing portion of the first sealing assembly 200 and the second sealing assembly 300, the first sealing assembly 200 and the second sealing assembly 300 can apply pressure towards the piston end, so that the first sealing assembly 200 and the second sealing assembly 300 can be sealed with the piston end respectively, thereby improving the air tightness of the fluid on-off structure, and realizing accurate control of starting and stopping of sand blasting powder.

[0067] As shown in FIG. 1, Figure 2 In an optional embodiment, the first sealing assembly 200 comprises a first pre-pressing member 201 and a first sealing member 202. The first pre-pressing member 201 is arranged on the first inner surface of the piston cavity, and the first pre-pressing member 201 has a first sub-through hole. The first sealing member 202 is arranged on the side of the first pre-pressing member 201 away from the first inner surface of the piston cavity, and the first sealing member 202 has a second sub-through hole. The first sub-through hole and the second sub-through hole are oppositely arranged, and the first sub-through hole and the second sub-through hole are communicated to form a first through hole. The sealing surface of the first sealing member 202 is the side of the first sealing member 202 away from the first pre-pressing member 201.

[0068] In this optional embodiment, referring to Figure 1 , Figure 2A first pre-compression member 201 and a first sealing member 202 are sequentially provided on the first inner surface of the piston cavity. The first pre-compression member 201 has an expansion potential energy toward the first sealing member 202 under the limitation of the first inner surface, so that the first sealing member 202 can be subjected to the pre-compression force from the first pre-compression member 201, thereby enabling the first sealing member 202 to apply pressure to the piston end of the piston assembly 400, and thus enabling the first sealing member 202 to seal with the piston end.

[0069] Furthermore, the first sub-through hole of the first pre-compression member 201 and the second sub-through hole of the first sealing member 202 are correspondingly arranged and interconnected, and the interconnected first sub-through hole and second sub-through hole are the aforementioned first through hole. The sealing surface of the first sealing member 202 is located on the right side of the first sealing member 202, and the first sealing member 202 contacts the piston end of the piston assembly 400 through its sealing surface.

[0070] As can be seen, this optional embodiment can also apply a pre-tightening force to the first seal 202 through the first pre-tightening member 201, so that the first seal 202 can apply pressure to the piston end of the piston assembly 400, thereby achieving a seal between the first seal 202 and the piston end, thereby further improving the airtightness of the fluid flow interruption structure.

[0071] like Figure 3 As shown, in an optional embodiment, the second sealing assembly 300 includes a second pre-compression member 301 and a second sealing member 302. The second pre-compression member 301 is disposed on the second inner surface of the piston cavity and has a third sub-through hole; the second sealing member 302 is disposed on the side of the second pre-compression member 301 away from the second inner surface of the piston cavity 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, and the sealing surface of the second sealing member 302 is the side of the second sealing member 302 away from the second pre-compression member 301, and the sealing surface of the second sealing member 302 is disposed opposite to the sealing surface of the first sealing member 202.

[0072] In this optional embodiment, refer to Figure 1 , Figure 3 A second pre-compression member 301 and a second sealing member 302 are sequentially provided on the second inner surface of the piston cavity. The second pre-compression member 301 has an expansion potential energy toward the second sealing member 302 under the limitation of the second inner surface, so that the second sealing member 302 can be subjected to the pre-compression force from the second pre-compression member 301, thereby enabling the second sealing member 302 to apply pressure to the piston end of the piston assembly 400, and thus enabling the second sealing member 302 to seal with the piston end.

[0073] Further, the third sub-through hole of the second pre-tightening member 301 and the fourth sub-through hole of the second sealing member 302 are arranged corresponding to each other and communicate with each other, and the communicated third sub-through hole and fourth sub-through hole are the second through hole described above. The sealing surface of the second sealing member 302 is located on the left side of the second sealing member 302, that is, the sealing surface of the second sealing member 302 is arranged opposite to the sealing surface of the first sealing member 202, and the second sealing member 302 contacts the piston end of the piston assembly 400 through the sealing surface thereof. Among them, the first sealing member 202 and the second sealing member 302 can be selected as ceramic sheets made of ceramic materials.

[0074] It can be seen that the optional embodiment can also apply a pre-tightening force to the second sealing member 302 through the second pre-tightening member 301, so that the second sealing member 302 can apply pressure to the piston end of the piston assembly 400, thereby realizing the sealing between the second sealing member 302 and the piston end, and further improving the air tightness of the fluid on-off structure.

[0075] As shown in Figure 2 and Figure 3 , in an optional embodiment, the outer shell 100 includes a first base 101 and a second base 102. The first base 101 has a third through hole, and the connecting side of the first base 101 is provided with a first piston groove, the third through hole and the first piston groove communicate, the first pre-tightening member 201 and the first sealing member 202 are arranged on the inner surface of the first piston groove in sequence, and the first sub-through hole of the first pre-tightening member 201, the second sub-through hole of the first sealing member 202 and the third through hole of the first base 101 are arranged opposite to each other in pairs; the second base 102 has a fourth through hole, and the connecting side of the second base 102 is provided with a second piston groove, the fourth through hole and the second piston groove communicate, the second pre-tightening member 301 and the second sealing member 302 are arranged on the inner surface of the second piston groove in sequence, and the third sub-through hole of the second pre-tightening member 301 and the fourth sub-through hole of the second sealing member 302 are arranged opposite to the fourth through hole of the second base 102; wherein the connecting side of the first base 101 and the connecting side of the second base 102 are arranged opposite to each other, and the connecting side of the first base 101 and the connecting side of the second base 102 are connected, so that the first piston groove and the second piston groove form a piston cavity.

[0076] In this optional embodiment, referring to Figure 1 , Figure 2 and Figure 3 , Figure 1 , the left half of the outer shell 100 can be divided into Figure 2 the first base 101, and the right half of the outer shell 100 can be divided into Figure 3 the second base 102.

[0077] The connecting side of the first base 101 is located on the right side surface of the first base 101, and the connecting side of the first base 101 is provided with a first piston groove, the inner surface of the first piston groove is the first inner surface of the piston cavity, and the inner surface of the first piston groove is sequentially provided with a first pre-pressing part 201 and a first sealing part 202. The connecting side of the second base 102 is located on the left side surface of the second base 102, and the connecting side of the second base 102 is provided with a second piston groove, the inner surface of the second piston groove is the second inner surface of the piston cavity, and the inner surface of the second piston groove is sequentially provided with a second pre-pressing part 301 and a second sealing part 302.

[0078] The connecting side of the first base 101 is connected with the connecting side of the second base 102, so that the first piston groove of the first base 101 and the second piston groove of the second base 102 form the piston cavity, that is, the piston end of the piston assembly 400 can move up and down in the first piston groove and the second piston groove. It can be understood that the shape of the first piston groove and the shape of the second piston groove can be referred to the description of the cavity shape of the piston cavity, that is, the shape of the first piston groove and the shape of the second piston groove are determined by the shape of the piston end of the piston assembly 400.

[0079] Further, referring to Figure 2 , the first base 101 is also provided with a third through hole, and the third through hole of the first base 101 is in communication with the first sub-through hole of the first pre-pressing part 201 and the second sub-through hole of the first sealing part 202. Figure 3 , the second base 102 is also provided with a fourth through hole, and the fourth through hole of the second base 102 is in communication with the third sub-through hole of the second pre-pressing part 301 and the fourth sub-through hole of the second sealing part 302.

[0080] It can be seen that the optional embodiment can also form a piston cavity by the first piston groove of the first base 101 and the second piston groove of the second base 102, so that the piston end of the piston assembly 400 can move in the first piston groove and the second piston groove.

[0081] As Figure 2 and Figure 3 shown, in an optional embodiment, the inner surface of the first piston groove of the first base 101 is provided with a first fixed groove, the third through hole is in communication with the first fixed groove, the first pre-pressing part 201 and the first sealing part 202 are sequentially arranged in the first fixed groove, and the sealing surface of the first sealing part 202 is flush with the inner surface of the first piston groove; the inner surface of the second piston groove of the second base 102 is provided with a second fixed groove, the fourth through hole is in communication with the second fixed groove, the second pre-pressing part 301 and the second sealing part 302 are sequentially arranged in the second fixed groove, and the sealing surface of the second sealing part 302 is flush with the inner surface of the second piston groove.

[0082] In this optional embodiment, a first fixing groove is provided on the inner surface of the first piston groove, and a first pre-compression member 201 and a first sealing member 202 are disposed in the first fixing groove. The first pre-compression member 201 and the first sealing member 202 are sequentially disposed on the inner surface of the first fixing groove, so that the first fixing groove can fix the first pre-compression member 201 and the first sealing member 202. A second fixing groove is provided on the inner surface of the second piston groove, and a second pre-compression member 301 and a second sealing member 302 are disposed in the second fixing groove. The second pre-compression member 301 and the second sealing member 302 are sequentially disposed on the inner surface of the second fixing groove, so that the second fixing groove can fix the second pre-compression member 301 and the second sealing member 302.

[0083] Furthermore, the sealing surface of the first seal 202 is flush with the inner surface of the first piston groove, and the sealing surface of the second seal 302 is flush with the inner surface of the second piston groove, so that the piston end of the piston assembly 400 can move up and down in the first piston groove and the second piston groove, and the first seal 202 can contact the piston end of the piston assembly 400 through its sealing surface, and the second seal 302 can contact the piston end of the piston assembly 400 through its sealing surface.

[0084] As can be seen, this optional embodiment can also fix the first pre-compression member 201 and the first sealing member 202 through the first fixing groove of the first base 101, and fix the second pre-compression member 301 and the second sealing member 302 through the second fixing groove of the second base 102. This ensures that the first pre-compression member 201, the first sealing member 202, the second pre-compression member 301 and the second sealing member 302 will not disengage when the piston end of the piston assembly 400 moves up and down due to the limiting effect, thereby further ensuring the reliability of the fluid flow control structure in controlling the fluid flow.

[0085] like Figure 4 As shown, in an optional embodiment, the sealed fluid flow control structure further includes: a first flow guide connector 500 and a second flow guide connector 600. The first flow guide connector 500 is disposed at the third through hole of the first base 101, and the interface of the first flow guide connector 500 is connected to the third through hole of the first base 101, the first sub-through hole of the first pre-compression member 201, and the second sub-through hole of the first sealing member 202, respectively; the second flow guide connector 600 is disposed at the fourth through hole of the second base 102, and the interface of the second flow guide connector 600 is connected to the fourth through hole of the second base 102, the third sub-through hole of the second pre-compression member 301, and the fourth sub-through hole of the second sealing member 302, respectively.

[0086] In the optional embodiment, the first flow guide joint 500 is connected with the third through hole of the first base 101, so that the interface of the first flow guide joint 500 is in communication with the third through hole of the first base 101, the first sub-through hole of the first pre-tightening member 201 and the second sub-through hole of the first sealing member 202 respectively. The second flow guide joint 600 is connected with the fourth through hole of the second base 102, so that the interface of the second flow guide joint 600 is in communication with the fourth through hole of the second base 102, the third sub-through hole of the second pre-tightening member 301 and the fourth sub-through hole of the second sealing member 302 respectively. The first flow guide joint 500 and the second flow guide joint 600 can be connected with the external fluid flow guide pipe, so that the fluid conveyed by the fluid flow guide pipe can be introduced into and discharged from the fluid on-off structure.

[0087] It can be seen that the optional embodiment can also introduce and discharge the sandblasting fluid which needs to be controlled on-off through the first flow guide joint 500 and the second flow guide joint 600, so as to ensure that the sandblasting fluid does not overflow when being conveyed to the fluid on-off structure and discharged from the fluid on-off structure, thereby improving the stability of the sandblasting fluid conveying.

[0088] In an optional embodiment, the constituent material of the first pre-tightening member 201 and the constituent material of the second pre-tightening member 301 are soft material or elastic material respectively.

[0089] In the optional embodiment, referring to Figure 4 , the first pre-tightening member 201 and the second pre-tightening member 301 can be selected as a hollow annular gasket with soft material or elastic material as the constituent material. The middle hollow part of the annular gasket is the first sub-through hole of the first pre-tightening member 201 or the third sub-through hole of the second pre-tightening member 301. Since the soft material or the elastic material has expansion potential under compression, the pre-tightening force on the first sealing member 202 or the second sealing member 302 can be improved, so as to improve the pressure applied to the piston end of the piston assembly 400, and further ensure the sealing between the first sealing member 202 and the second sealing member 302 and the piston end. It can be understood that, taking the first fixed groove of the first base 101 as an example, the first sealing member 202 placed in the first fixed groove can compress the first pre-tightening member 201 under the limiting of the inner surface of the first fixed groove, so that the first pre-tightening member 201 has expansion potential. The second fixed groove of the second base 102 is the same.

[0090] It can be seen that the optional embodiment can also use soft material or elastic material as the constituent material of the first pre-tightening member 201 and the second pre-tightening member 301, so as to further improve the air tightness of the fluid on-off structure.

[0091] As Figure 4As shown, in one optional embodiment, the piston assembly 400 comprises a cylinder body 410 and a plunger body 420. The cylinder body 410 has a gas pressure cavity; the plunger body 420 has a piston end with a piston through hole, the plunger body 420 is arranged in the gas pressure cavity, and the piston end of the plunger body 420 is in contact with the sealing surface of the first sealing assembly 200 and the sealing surface of the second sealing assembly 300 respectively; wherein the cylinder body 410 is used to push the piston end of the plunger body 420 to move in the piston cavity by controlling the gas pressure of the gas pressure cavity, so as to make the first through hole and the second through hole communicate through the piston through hole, or make the piston end block the communication between the first through hole and the second through hole.

[0092] In this optional embodiment, the plunger body 420 is arranged in the gas pressure cavity of the cylinder body 410, and the cylinder body 410 pushes the plunger body 420 to move longitudinally up and down by means of ventilating and pressurizing the gas pressure cavity, so as to drive the piston end of the plunger body 420 to move longitudinally up and down in the piston cavity formed by the first piston groove and the second piston groove. Since the piston end of the plunger body 420 is provided with a piston through hole, when the piston end of the plunger body 420 is driven to move longitudinally 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, at this time the first through hole and the second through hole can communicate 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, the non-through hole part of the piston end can block the communication between the first through hole and the second through hole.

[0093] It can be seen that this optional embodiment can also push the plunger body 420 to move longitudinally up and down by means of ventilating and pressurizing the gas pressure cavity of the cylinder body 410, so as to drive the piston end of the plunger body 420 to move longitudinally 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 communication of the fluid, and further improving the accuracy of controlling the start and stop of the sandblasting powder.

[0094] As Figure 4 and Figure 5As shown, in one optional embodiment, the plug rod body 420 comprises a plug rod base 421, a plug rod body 422 and a sealing sheet 423. The plug rod base 421 is arranged in the air pressure cavity, and the circumferential surface of the plug rod base 421 is in contact with the inner wall of the air pressure cavity to seal the air pressure cavity; the plug rod body 422 is arranged on the side of the plug rod base 421 away from the inside of the air pressure cavity, and the plug rod body 422 has a fixed through cavity; the sealing sheet 423 has a piston through hole, and the sealing sheet 423 is arranged in the fixed through cavity, the first side surface of the sealing sheet 423 is in contact with the sealing surface of the first sealing assembly 200, the second side surface of the sealing sheet 423 is in contact with the sealing surface of the second sealing assembly 300, and the first side surface of the sealing sheet 423 and the second side surface of the sealing sheet 423 are two opposite side surfaces of the sealing sheet 423; wherein the air cylinder body 410 is used to push the plug rod base 421 by controlling the air pressure of the air pressure cavity to drive the sealing sheet 423 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.

[0095] In this optional embodiment, the plug rod base 421 is arranged in the air pressure cavity, and the circumferential surface of the plug rod base 421 is in contact with the inner wall of the air pressure cavity to seal the lower side surface of the plug rod base 421. Referring to Figure 5 , the plug rod body 422 is arranged on the upper side surface of the plug rod base 421, and the plug rod body 422 is a frame type limiting device, wherein the middle part has a fixed through cavity, and the fixed through cavity is in communication with the outside of the plug rod body 422 through the left and right sides. Referring to Figure 4 , the plug rod body 422 fixes the sealing sheet 423 in the fixed through cavity of the plug rod body 422, the first side surface of the sealing sheet 423 is located on the left side, the second side surface of the sealing sheet 423 is located on the right side, the first side surface of the sealing sheet 423 is in contact with the sealing surface of the first sealing assembly 202, and the second side surface of the sealing sheet 423 is in contact with the sealing surface of the second sealing assembly 300. Wherein, the sealing sheet 423 is provided with a piston through hole in communication with the left and right sides, and the sealing sheet 423 can be made of ceramic material.

[0096] Further, the air cylinder body 410 can push the plug rod base 421 to move vertically by the way of air pressure in the air pressure cavity, thereby driving the plug rod body 422 and the sealing sheet 423 to move vertically in the piston cavity formed by the first piston groove and the second piston groove. If the piston through hole of the sealing sheet 423 is aligned with the first through hole and the second through hole, the first through hole and the second through hole can communicate through the piston through hole at this time, 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 sheet 423 is not aligned with the first through hole and the second through hole, the non-through hole part of the sealing sheet 423 can block the communication between the first through hole and the second through hole.

[0097] It can be seen that the optional embodiment can also fix the sealing sheet 423 in the fixed through cavity of the plug rod body 422 by the plug rod body 422, so that the sealing sheet 423 will not be separated from the piston cavity when moving up and down in the piston cavity due to the limiting, thereby ensuring the reliability of the fluid on-off structure in controlling the fluid on-off.

[0098] The utility model discloses still a kind of dental sand blasting equipment, it includes piston controller, sand blasting flow guide pipe body and the sealing type fluid on-off structure described in the above embodiment of the utility model. Piston controller is connected with piston assembly 400, and piston controller is used to control the piston end of piston assembly 400 movement in piston cavity;Sand blasting flow guide pipe body is communicated with the first through hole of first sealing assembly 200 and the second through hole of second sealing assembly 300 respectively.

[0099] In the embodiment, sand blasting flow guide pipe body has front section pipe body and rear section pipe body, and the front section pipe body of sand blasting flow guide pipe body is communicated with the first through hole formed by the third through hole of first base 101, first pre-pressing part 201 and first sealing member 202 by being connected with first flow guide connector 500, and the rear section pipe body is communicated with the second through hole formed by the fourth through hole of second base 102, second pre-pressing part 301 and second sealing member 302 by being connected with second flow guide connector 600.

[0100] Piston controller is connected with cylinder body 410, and piston controller can control the vertical movement of sealing sheet 423 in the piston cavity formed by first piston groove and second piston groove by the air pressure cavity ventilation of cylinder body 410. Sand blasting flow guide pipe body can transport sand blasting fluid, when the piston through hole of sealing sheet 423 is aligned with first through hole and second through hole, first through hole and second through hole can be communicated by piston through hole, and sand blasting fluid transported by front section pipe body can flow through first through hole, piston through hole and second through hole, and be transported to rear section pipe body;When the piston through hole of sealing sheet 423 is not aligned with first through hole and second through hole, the non-through hole part of sealing sheet 423 can block the communication between first through hole and second through hole, and sand blasting fluid transported by front section pipe body cannot be transported to rear section pipe body.

[0101] It can be seen that in the embodiment, the dental sandblasting equipment adopts the sealing fluid on-off structure, the pre-pressing part of the first sealing assembly 200 is arranged towards the first inner surface of the piston cavity, the pre-pressing part of the second sealing assembly 300 is arranged towards the second inner surface of the piston cavity, the piston end of the piston assembly 400 is in contact with the sealing surface of the first sealing assembly 200 and the sealing surface of the second sealing assembly 300 respectively, the pre-pressing part of the first sealing assembly 200 and the second sealing assembly 300 can apply pressure towards the piston end, the first sealing assembly 200 and the second sealing assembly 300 can be sealed with the piston end respectively, the air tightness of the fluid on-off structure is improved, and the accurate control of the dental sandblasting equipment on the starting and stopping of the sandblasting powder is realized.

[0102] The technical means disclosed in the utility model scheme is not limited to the technical means disclosed in the above-mentioned embodiments, and also includes the technical scheme composed of any combination of the above technical features. It should be pointed out that, for ordinary skilled persons in the art, without departing from the principle of the utility model, a number of improvements and refinements can be made, and these improvements and refinements are also considered to be within the protection scope of the utility model.

Claims

1. A sealed fluid on-off structure, characterized by, The structure comprises: an outer shell having a piston cavity; a first sealing assembly arranged on a first inner surface of the piston cavity, the first sealing assembly having a pre-pressing part that exerts a pre-tightening force on a sealing surface of the first sealing assembly, the first sealing assembly having a first through hole; a second sealing assembly arranged on a second inner surface of the piston cavity, the second sealing assembly having a pre-pressing part that exerts a pre-tightening force on a sealing surface of the second sealing assembly, the second sealing assembly having a second through hole; wherein the first inner surface and the second inner surface are two opposite inner surfaces of the piston cavity, the sealing surface of the first sealing assembly and the sealing surface of the second sealing assembly are arranged opposite to each other, and the first through hole and the second through hole are arranged opposite to each other; a piston assembly, a piston end of the piston assembly having a piston through hole, the piston end of the piston assembly being in contact with the sealing surface of the first sealing assembly and the sealing surface of the second sealing assembly respectively, the piston end of the piston assembly being 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 block the communication between the first through hole and the second through hole.

2. The sealed fluid break structure of claim 1, wherein, The first sealing assembly comprises: a first pre-pressing part arranged on the first inner surface of the piston cavity, the first pre-pressing part having a first sub-through hole; a first sealing part arranged on a side of the first pre-pressing part away from the first inner surface of the piston cavity, the first sealing part having a second sub-through hole; wherein the first sub-through hole and the second sub-through hole are arranged opposite to each other, the first sub-through hole and the second sub-through hole communicate to form the first through hole, the sealing surface of the first sealing assembly is a sealing surface of the first sealing part, and the sealing surface of the first sealing part is a side of the first sealing part away from the first pre-pressing part.

3. The sealed fluid break structure of claim 2, wherein, The second sealing assembly comprises: a second pre-pressing part arranged on the second inner surface of the piston cavity, the second pre-pressing part having a third sub-through hole; a second sealing part arranged on a side of the second pre-pressing part away from the second inner surface of the piston cavity, the second sealing part having a fourth sub-through hole; wherein the third sub-through hole and the fourth sub-through hole are arranged opposite to each other, the third sub-through hole and the fourth sub-through hole communicate to form the second through hole, the sealing surface of the second sealing assembly is a sealing surface of the second sealing part, the sealing surface of the second sealing part is a side of the second sealing part away from the second pre-pressing part, and the sealing surface of the second sealing part is arranged opposite to the sealing surface of the first sealing part.

4. The sealed fluid break structure of claim 3, wherein, The outer shell comprises: The first base has a third through hole, and a connecting side of the first base is provided with a first piston groove, the third through hole and the first piston groove are communicated, the first pre-pressing part and the first sealing part are sequentially arranged on an inner surface of the first piston groove, and a first sub-through hole of the first pre-pressing part and a second sub-through hole of the first sealing part are oppositely arranged with the third through hole of the first base; The second base has a fourth through hole, and a connecting side of the second base is provided with a second piston groove, the fourth through hole and the second piston groove are communicated, the second pre-pressing part and the second sealing part are sequentially arranged on an inner surface of the second piston groove, and a third sub-through hole of the second pre-pressing part and a fourth sub-through hole of the second sealing part are oppositely arranged with the fourth through hole of the second base; The connecting side of the first base is oppositely arranged with 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.

5. The sealed fluid break structure of claim 4, wherein, An inner surface of the first piston groove of the first base is provided with a first fixing groove, the third through hole and the first fixing groove are communicated, the first pre-pressing part and the first sealing part are sequentially arranged in the first fixing groove, and a sealing surface of the first sealing part is flush with the inner surface of the first piston groove; An inner surface of the second piston groove of the second base is provided with a second fixing groove, the fourth through hole and the second fixing groove are communicated, the second pre-pressing part and the second sealing part are sequentially arranged in the second fixing groove, and a sealing surface of the second sealing part is flush with the inner surface of the second piston groove.

6. The sealed fluid break structure of claim 5, wherein, The structure further comprises: A first flow guide connector is arranged at the third through hole of the first base, and an interface of the first flow guide connector is communicated with the third through hole of the first base, the first sub-through hole of the first pre-pressing part and the second sub-through hole of the first sealing part respectively; A second flow guide connector is arranged at the fourth through hole of the second base, and an interface of the second flow guide connector is communicated with the fourth through hole of the second base, the third sub-through hole of the second pre-pressing part and the fourth sub-through hole of the second sealing part respectively.

7. The sealed fluid break structure of claim 3, wherein, The first pre-pressing part and the second pre-pressing part are respectively made of soft material or elastic material.

8. The sealed fluid break structure according to any one of claims 1 to 7, wherein The piston assembly comprises: A cylinder body has a gas pressure cavity; A plug rod body has a piston through hole at a piston end, the plug rod body is arranged in the gas pressure cavity, and the piston end of the plug rod body is in contact with a sealing surface of the first sealing assembly and a sealing surface of the second sealing assembly respectively; The 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.

9. The sealed fluid break structure of claim 8, wherein, The plug rod body comprises: A plug rod base is arranged in the air pressure cavity, and a circumference of the plug rod base is in contact with an inner wall of the air pressure cavity to seal the air pressure cavity. A plug rod body is arranged on a side of the plug rod base away from the inside of the air pressure cavity, and the plug rod body has a fixed through cavity. A sealing sheet has a piston through hole, and the sealing sheet is arranged in the fixed through cavity. A first side of the sealing sheet is in contact with a sealing surface of the first sealing assembly, and a second side of the sealing sheet is in contact with a sealing surface of the second sealing assembly. The first side and the second side of the sealing sheet are opposite sides of the sealing sheet. The air cylinder body is used to push the plug rod base by controlling the air pressure of the air pressure cavity to drive the sealing sheet to move in the piston cavity to make the first through hole and the second through hole communicate through the piston through hole or make the piston end block the communication between the first through hole and the second through hole.

10. A dental sandblasting device, characterized in that The device comprises: The sealing type fluid on-off structure according to any one of claims 1 to 9; A piston controller is connected with the piston assembly, and the piston controller is used to control the piston end of the piston assembly to move in the piston cavity. A sand blasting flow guide pipe body is in communication with the first through hole of the first sealing assembly and the second through hole of the second sealing assembly respectively.

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