Medical dental three-purpose gun

Abstract

A medical dental three-purpose gun comprises a gun body, a main outlet and a conveying structure are arranged on the gun body, and the conveying structure comprises a first channel, a second channel and a valve; the valve comprises a valve body, a pressure spring, a valve sealing ring and a valve rod, a valve cavity is formed in the valve body, the upper end of the valve cavity is a penetrating opening, and the lower end of the valve cavity is provided with a valve inlet; the lower end of the valve rod sequentially penetrates through the penetrating opening, the valve cavity and the valve inlet and then is provided with a valve sealing ring. The pressure spring is arranged in the valve cavity; and a first sealing surface is arranged on the valve body. When a medical worker releases the valve rod, the first sealing face is used for limiting the valve sealing ring from entering the valve inlet and achieving sealing of the valve inlet, the valve sealing ring does not need to enter the valve inlet through the structure, the probability that the valve sealing ring is scratched and damaged is effectively avoided, and then the purpose of prolonging the service life of the dental three-purpose gun is achieved.

Description

Technical Field

[0001] The utility model relates to the technical field of dental instruments, in particular to a medical dental three-purpose gun. Background Art

[0002] The dental three-purpose spray gun is a cleaning tool used in dental oral treatment. It can achieve treatment functions such as spraying liquid, jet or atomization into the patient's mouth by controlling the ejection of media such as liquid and gas.

[0003] like Figure 1-2 As shown, the existing dental three-purpose gun usually includes a gun body Ⅰ1', a handle Ⅰ2' installed on one end of the gun body Ⅰ1' and a spray rod installed on the other end of the gun body Ⅰ1', wherein the gun body Ⅰ1' is provided with a total outlet Ⅰ11' and two conveying structures, the input end of the spray rod is connected to the total outlet Ⅰ11', the conveying structure includes a first channel Ⅰ12', a second channel Ⅰ13' and a valve for controlling the conduction and disconnection of the first channel Ⅰ12' and the second channel Ⅰ13', the first channel Ⅰ12' is connected to the total outlet Ⅰ11'; the valve includes a valve body Ⅰ3', a compression spring Ⅰ4', a valve sealing ring Ⅰ5' and a valve stem Ⅰ6', the valve body Ⅰ3' is installed in the switch slot of the gun body Ⅰ1', and the A valve cavity Ⅰ31' is provided in the valve body Ⅰ3' which is penetrated from top to bottom, and the upper and lower ends of the valve cavity Ⅰ31' are respectively a through-port and a valve inlet; a valve outlet corresponding to the first channel Ⅰ12' is provided on the outer side of the valve body Ⅰ3'; one end of the valve stem Ⅰ6' extends out of the gun body Ⅰ1', and the other end is installed with the valve sealing ring Ⅰ5' after passing through the through-port, the valve cavity Ⅰ31' and the valve inlet in sequence; the compression spring Ⅰ4' is sleeved on the valve stem Ⅰ6', the upper end of the compression spring Ⅰ4' extends into the valve cavity Ⅰ31' and abuts against the upper supporting surface of the valve stem Ⅰ6', and the lower end abuts against the bottom surface of the switch groove in the switch groove, and the valve sealing ring Ⅰ5' is located between the thread pitches of the compression spring Ⅰ4'.

[0004] The medical staff presses the valve stem Ⅰ6' downward, and the compression spring Ⅰ4' is compressed. At the same time, the valve sealing ring Ⅰ5' on the valve stem Ⅰ6' moves downward to withdraw from the valve inlet position, and the valve inlet is blocked, so that the medium in the second channel Ⅰ13' can enter the first channel Ⅰ12', and then flow to the spray rod at the total outlet Ⅰ11'; after the medical staff releases the valve stem Ⅰ6', the compression spring Ⅰ4' expands and resets, driving the valve sealing ring Ⅰ5' to squeeze into the valve inlet to realize the closure of the valve inlet, so that the medium cannot continue to flow to the first channel Ⅰ12'.

[0005] However, although the above structure can effectively control the output of the medium, it is found that the technical solution still has certain shortcomings during use. For example, the valve seal ring Ⅰ5' needs to be squeezed into the valve inlet position to close the valve inlet. When the valve seal ring Ⅰ5' enters the valve inlet position, the valve seal ring Ⅰ5' is easily scratched by the corners formed by the connection position between the lower end surface of the valve body Ⅰ3' and the wall surface of the valve inlet, resulting in accelerated wear of the valve seal ring Ⅰ5', thereby affecting the closing effect of the valve inlet and causing the medium to leak easily. In addition, the valve seal ring Ⅰ5' is also located at the pitch position of the compression spring Ⅰ4'. When the compression spring Ⅰ4' is compressed, the compression spring Ⅰ4' will squeeze the valve seal ring Ⅰ5', further accelerating the wear speed of the valve seal ring Ⅰ5', thereby further affecting the closing effect of the valve inlet. Utility Model Content

[0006] In order to overcome the deficiencies of the prior art, the utility model provides a medical dental three-purpose gun.

[0007] The technical solution adopted by the utility model to solve its technical problems is:

[0008] A medical dental three-purpose gun comprises a gun body, the gun body is provided with a main outlet and a conveying structure, the conveying structure comprises a first channel, a second channel and a valve, the first channel is connected with the main outlet;

[0009] The valve comprises a valve body, a compression spring, a valve sealing ring and a valve stem. A valve cavity is arranged in the valve body, the upper end of the valve cavity is a through-hole, and the lower end is provided with a valve inlet; a valve outlet communicating with the first channel and the valve cavity is arranged on the outer side of the valve body; a valve sealing ring is installed on the lower end of the valve stem after passing through the through-hole, the valve cavity and the valve inlet in sequence; the characteristics are:

[0010] The compression spring is arranged in the valve cavity, and the upper and lower ends of the compression spring are respectively in contact with the valve stem and the valve cavity;

[0011] The valve body is provided with a first sealing surface for limiting the valve sealing ring from entering the valve inlet and cooperating with the valve sealing ring to seal the valve inlet. The first sealing surface is arranged below the valve inlet and around the periphery of the valve inlet.

[0012] In the utility model, a lower supporting surface located above the valve inlet is provided in the valve cavity, an upper supporting surface above the lower supporting surface is provided on the valve stem, and the upper and lower ends of the compression spring respectively abut against the upper supporting surface and the lower supporting surface.

[0013] In the utility model, the top surface of the valve sealing ring is a second sealing surface for fitting with the first sealing surface, the second sealing surface is arranged around the valve stem, and the first sealing surface and the second sealing surface are both planes.

[0014] In the utility model, a switch groove is provided on the gun body, one end of the switch groove is a switch notch penetrating the gun body, the valve body is installed in the switch groove with its lower end abutting against the bottom surface of the switch groove, and the upper end of the valve stem extends out of the gun body through the switch notch; the input end of the first channel penetrates the groove surface of the switch groove, the output end of the second channel is a movable channel connected to the other end of the switch groove, and the valve sealing ring closes and opens the valve inlet by moving in the movable channel.

[0015] In the utility model, an avoidance communication groove is provided in the middle position of the outer side of the valve body, the avoidance communication groove is arranged around the outer circumference of the valve body, the output end of the valve outlet is connected to the avoidance communication groove, and the avoidance communication groove is configured to always maintain communication with the input end of the first channel.

[0016] In the utility model, the valve stem includes an operating head, a first guide portion, a linkage rod and a mounting head which are sequentially connected from top to bottom. The top of the operating head is located outside the gun body, the compression spring is sleeved on the linkage rod, and the valve sealing ring is sleeved on the mounting head.

[0017] In the utility model, a first groove is provided on the outer peripheral surface of the mounting head and is arranged around the mounting head in a circumferential direction. The inner ring of the valve sealing ring is matched and embedded in the first groove. The cross-sectional shape of the valve sealing ring and the cross-sectional shape of the first groove are both square.

[0018] In the utility model, the valve also includes a lower sealing ring mounted on the valve body, and a lower groove located below the avoidance connecting groove is provided on the outer side of the valve body. The outer ring of the lower sealing ring abuts against the groove wall of the switch groove, and the inner ring is embedded in the lower groove. The lower sealing ring is used to cooperate and seal with the lower outer side of the valve body and the groove wall of the switch groove.

[0019] In the utility model, the valve also includes a second sealing ring, which is sleeved on the first guide portion of the valve stem, the outer ring of the second sealing ring abuts against the groove wall of the switch groove, the inner ring of the second sealing ring abuts against the outer peripheral surface of the first guide portion, and the bottom surface of the second sealing ring abuts against the top surface of the valve body.

[0020] In the utility model, the valve further comprises a limit ring which prevents the valve body from moving in the direction of the switch notch. The limit ring is sleeved on the first guide portion of the valve stem and abuts against the top surface of the second sealing ring.

[0021] Beneficial effects of the utility model: The utility model is provided with a first sealing surface on the valve body for limiting the valve seal ring from entering the valve inlet and cooperating with the valve seal ring to block the valve inlet. When the medical staff releases the valve stem, the first sealing surface is used to limit the valve seal ring from entering the valve inlet, and the valve inlet is closed by cooperating with the valve seal ring and the first sealing surface. This structure allows the valve seal ring to not enter the valve inlet, effectively avoiding the probability of the valve seal ring being scratched and damaged, so that the valve seal ring can stably play the role of blocking the valve inlet when the medical staff does not operate the valve stem, avoiding the medium from leaking from the second channel and flowing to the spray rod of the dental three-in-one gun, thereby achieving the purpose of extending the service life of the dental three-in-one gun. In addition, the compression spring can be in the valve cavity all the time, so that the compression spring cannot contact the valve seal ring, thereby avoiding the problem of the valve seal ring being crushed by the compression spring, and further extending the service life of the dental three-in-one gun. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] The utility model is further described below in conjunction with the accompanying drawings and embodiments:

[0023] Figure 1 A three-dimensional diagram of an existing dental three-purpose gun;

[0024] Figure 2 The present invention is a schematic diagram of the installation of a valve in an existing dental three-purpose gun;

[0025] Figure 3 It is a structural schematic diagram of this embodiment;

[0026] Figure 4 This is the valve installation diagram of this embodiment;

[0027] Figure 5 is a three-dimensional diagram of the valve in this embodiment;

[0028] Figure 6 Schematic diagram of the internal structure of the valve of this embodiment;

[0029] Figure 7 Schematic diagram of the cross section of the valve body in this embodiment. DETAILED DESCRIPTION

[0030] In order to make the purpose, technical solution and advantages of the embodiments of the present utility model clearer, the technical solution in the embodiments of the present utility model will be clearly and completely described below in conjunction with the drawings in the embodiments of the present utility model.

[0031] It should be noted that if the embodiments of the present invention involve directional indications (such as up, down, left, right, front, back, top, bottom, inside, outside, vertical, horizontal, longitudinal, counterclockwise, clockwise, circumferential, radial, axial...), then the directional indication is only used to explain the relative position relationship, movement status, etc. between the components in a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly.

[0032] In addition, if there are descriptions involving "first" or "second" etc. in the embodiments of the utility model, the descriptions of "first" or "second" etc. are only used for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" or "second" may explicitly or implicitly include at least one of the features. In addition, the technical solutions between the various embodiments can be combined with each other, but they must be based on the ability of ordinary technicians in the field to implement them. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such combination of technical solutions does not exist and is not within the scope of protection required by the utility model.

[0033] Reference Figure 3-7 A medical dental three-purpose gun comprises a gun body 1, a handle 2 installed at one end of the gun body 1 and a spray rod installed at the other end of the gun body 1, the gun body 1 is provided with a total outlet 11 and two conveying structures, the input end of the spray rod is connected with the total outlet 11, it is a conventional technology to install the spray rod on the gun body 1 and make it connected with the total outlet 11, so the spray rod is not shown in the drawings; the two conveying structures are used to convey liquid and gas respectively, the conveying structure comprises a first channel 12, a second channel 13 and a valve 3, the total outlet 11, the first channel 12 and the second channel 13 are all opened on the gun body 1, the first channel 1 2 is connected with the main outlet 11; the valve 3 comprises a valve body 31, a compression spring 32, a valve sealing ring 33 and a valve stem 34; the valve body 31 is installed in the gun body 1; a valve cavity 311 is arranged in the valve body 31; the upper end of the valve cavity 311 is a through-opening, and the lower end is provided with a valve inlet 312; the outer side of the valve body 31 is provided with a valve outlet 313 connecting the first channel 12 and the valve cavity 311; the upper end of the valve stem 34 extends out of the gun body 1, and the lower end is provided with the valve sealing ring 33 after passing through the through-opening, the valve cavity 311 and the valve inlet 312 in sequence, so that the valve sealing ring 33 is located below the valve body 31.

[0034] Furthermore, the compression spring 32 is arranged in the valve cavity 311, and the upper and lower ends of the compression spring 32 are respectively abutted against the valve stem 34 and the valve cavity 311. For example, the valve cavity 311 is provided with a lower supporting surface located above the valve inlet 312, and the valve stem 34 is provided with an upper supporting surface above the lower supporting surface. The upper and lower ends of the compression spring 32 are respectively abutted against the upper supporting surface and the lower supporting surface, so that the compression spring 32 can always be in the valve cavity 311, and the compression spring 32 cannot contact the valve sealing ring 33, thereby avoiding the problem of the valve sealing ring 33 being damaged by the compression spring 32.

[0035] Furthermore, the valve body 31 is provided with a first sealing surface 314 for limiting the valve sealing ring 33 from entering the valve inlet 312 and cooperating with the valve sealing ring 33 to seal the valve inlet 312. The first sealing surface 314 is arranged below the valve inlet 312 and around the outer periphery of the valve inlet 312. When the medical staff releases the valve stem 34, the valve stem 34 drives the valve sealing ring 33 to move upward under the elastic force of the compression spring 32 until it abuts against the first sealing surface 314 and closes the valve inlet 312, thereby limiting the valve seal from entering the valve inlet 312 by utilizing the first sealing surface 314. When the sealing ring 33 enters the valve inlet 312, the valve inlet 312 is closed by utilizing the cooperation between the valve sealing ring 33 and the first sealing surface 314. This structure allows the valve sealing ring 33 to not enter the valve inlet 312, effectively avoiding the chance of the valve sealing ring 33 being damaged by scratches, so that the valve sealing ring 33 can stably play the role of sealing the valve inlet 312 when the medical staff does not operate the valve stem 34, thereby preventing the medium from leaking from the second channel 13 and flowing to the spray rod of the dental three-way gun, thereby achieving the purpose of extending the service life of the dental three-way gun.

[0036] As a preferred embodiment, the top surface of the valve sealing ring 33 is a second sealing surface 331 for fitting with the first sealing surface 314, and the second sealing surface 331 is arranged around the valve stem 34. The first sealing surface 314 and the second sealing surface 331 are both planes, and the first sealing surface 314 and the second sealing surface 331 are parallel to each other. Therefore, when the second sealing surface 331 of the valve sealing ring 33 abuts against the first sealing surface 314, the contact area between the two is large, thereby improving the effect of closing the valve inlet 312.

[0037] As a preferred embodiment, a switch slot 14 is provided on the gun body 1, one end of the switch slot 14 is a switch notch penetrating the gun body 1, the valve body 31 is installed in the switch slot 14 and its lower end abuts against the bottom surface of the switch slot 14, and the upper end of the valve stem 34 extends out of the gun body 1 through the switch notch; the input end of the first channel 12 is arranged to pass through the slot surface of the switch slot 14, and the output end of the second channel 13 is an active channel 131 connected to the other end of the switch slot 14, and the valve sealing ring 33 closes and opens the valve inlet 312 by moving in the active channel 131.

[0038] As a preferred embodiment, a bypass communication groove 315 is provided at the middle position of the outer side of the valve body 31, and the bypass communication groove 315 is arranged around the outer periphery of the valve body 31. The output end of the valve outlet 313 is connected to the bypass communication groove 315, and the bypass communication groove 315 is configured to always maintain communication with the input end of the first channel 12. Through the above-mentioned structural arrangement, after the valve body 31 is installed in the switch groove 14, no matter which angle the valve body 31 is rotated to, the valve outlet 313 can maintain communication with the first channel 12 under the action of the bypass communication groove 315.

[0039] As a preferred embodiment, the valve stem 34 includes an operating head 341, a first guide portion 342, a linkage rod 343 and a mounting head 344 which are integrally formed and connected in sequence from top to bottom. The top of the operating head 341 is located outside the gun body 1, so that medical staff can press the operating head 341 to control the entire valve stem 34 to move downward; the upper support surface is the bottom surface of the first guide portion 342, and the compression spring 32 is mounted on the linkage rod 343.

[0040] Furthermore, the valve seal ring 33 is sleeved on the mounting head 344. For example, a first groove is provided on the outer peripheral surface of the mounting head 344 and is arranged circumferentially around the mounting head 344. The inner ring of the valve seal ring 33 is matched and embedded in the first groove. In addition, in order to reduce the probability of the valve seal ring 33 slipping off the mounting head 344, the cross-sectional shape of the valve seal ring 33 and the cross-sectional shape of the first groove are both square.

[0041] As a preferred embodiment, the valve 3 also includes a lower sealing ring 35 mounted on the valve body 31, and a lower groove located below the avoidance connecting groove 315 is provided on the outer side of the valve body 31, and the outer ring of the lower sealing ring 35 abuts against the groove wall of the switch groove 14, and the inner ring is embedded in the lower groove. The lower sealing ring 35 is used to cooperate and seal with the lower outer side of the valve body 31 and the groove wall of the switch groove 14 to reduce the probability of the medium in the avoidance connecting groove 315 leaking from therebetween.

[0042] As a preferred embodiment, the valve 3 also includes a second sealing ring 36, which is sleeved on the first guide portion 342 of the valve stem 34, and the outer ring of the second sealing ring 36 abuts against the groove wall of the switch groove 14, and the inner ring of the second sealing ring 36 abuts against the outer peripheral surface of the first guide portion 342, thereby reducing the probability of the medium in the avoidance connecting groove 315 leaking from the upper outer side of the valve body 31 and the groove wall of the switch groove 14; the bottom surface of the second sealing ring 36 abuts against the top surface of the valve body 31, so that the second sealing ring 36 is used to close the through-hole located on the top surface of the valve body 31, thereby reducing the probability of the medium flowing out of the through-hole; and the second sealing ring 36 and the first guide portion 342 are interference fit, thereby reducing the probability of the medium flowing out from between the first sealing ring and the first guide portion 342.

[0043] As a preferred embodiment, the valve 3 also includes a limit ring 37 that prevents the valve body 31 from moving in the direction of the switch gap. The limit ring 37 is mounted on the first guide portion 342 of the valve stem 34 and abuts against the top surface of the second sealing ring 36, so that the second sealing ring 36 limits the valve body 31 and prevents the valve body 31 from moving in the direction of the switch gap; the outer peripheral surface of the first guide portion 342 is in sliding contact with the inner ring surface of the limit ring 37, so that the valve stem 34 can move relative to the second sealing ring 36.

[0044] Furthermore, the limiting ring 37 is provided with a limiting clamping position 371, and the gun body 1 is provided with a clamping member 4 clamped in the limiting clamping position 371. In this embodiment, the clamping member 4 can be a latch pin inserted into the gun body 1 or a bolt threadedly connected to the gun body 1, and the limiting clamping position 371 surrounds the outer ring surface of the limiting ring 37, so that the clamping member 4 can be quickly inserted into the limiting clamping position 371, thereby improving the matching efficiency of the clamping member 4 and the limiting clamping position 371.

[0045] As a preferred embodiment, the handle 2 is provided with a accommodating cavity that is penetrated therein, a second internal threaded hole is provided at one end of the accommodating cavity, the gun body 1 is integrally provided with a gun body threaded section 10 that is threadedly matched with the second internal threaded hole, the input end of the second channel 13 is arranged through the end surface of the gun body threaded section 10, the input end of the second channel 13 is the first internal threaded hole, and the first internal threaded hole is cooperated and connected with a pipe joint 5 located in the accommodating cavity.

[0046] The above description is only a preferred embodiment of the present invention. Any technical solution that achieves the purpose of the present invention by substantially the same means shall fall within the protection scope of the present invention.

Claims

1. A medical dental three-purpose gun, comprising a gun body (1), the gun body (1) being provided with a main outlet (11) and a delivery structure, the delivery structure comprising a first channel (12), a second channel (13) and a valve (3), the first channel (12) being in communication with the main outlet (11); The valve (3) comprises a valve body (31), a compression spring (32), a valve sealing ring (33) and a valve stem (34); a valve cavity (311) is provided in the valve body (31); the upper end of the valve cavity (311) is a through-hole, and the lower end is provided with a valve inlet (312); the outer side of the valve body (31) is provided with a valve outlet (313) communicating with the first channel (12) and the valve cavity (311); the lower end of the valve stem (34) is provided with a valve sealing ring (33) after passing through the through-hole, the valve cavity (311) and the valve inlet (312) in sequence; the characteristics are: The compression spring (32) is arranged in the valve cavity (311), and the upper and lower ends of the compression spring (32) are respectively in contact with the valve stem (34) and the valve cavity (311); The valve body (31) is provided with a first sealing surface (314) for limiting the valve sealing ring (33) from entering the valve inlet (312) and capable of cooperating with the valve sealing ring (33) to seal the valve inlet (312); the first sealing surface (314) is arranged below the valve inlet (312) and around the periphery of the valve inlet (312).

2. A medical dental three-in-one gun according to claim 1, characterized in that: The valve cavity (311) is provided with a lower support surface located above the valve inlet (312), the valve stem (34) is provided with an upper support surface above the lower support surface, and the upper and lower ends of the compression spring (32) respectively abut against the upper support surface and the lower support surface.

3. The medical dental three-in-one gun according to claim 1, characterized in that: The top surface of the valve sealing ring (33) is a second sealing surface (331) for contacting with the first sealing surface (314); the second sealing surface (331) is arranged around the valve stem (34); and the first sealing surface (314) and the second sealing surface (331) are both planes.

4. The medical dental three-in-one gun according to claim 1, characterized in that: The gun body (1) is provided with a switch slot (14), one end of the switch slot (14) is a switch notch penetrating the gun body (1), the valve body (31) is installed in the switch slot (14), the lower end of the valve body (31) abuts against the bottom surface of the switch slot (14), and the upper end of the valve stem (34) protrudes out of the gun body (1) through the switch notch; the input end of the first channel (12) penetrates the groove surface of the switch slot (14), the output end of the second channel (13) is a movable channel (131) connected to the other end of the switch slot (14), and the valve sealing ring (33) closes and opens the valve inlet (312) by moving in the movable channel (131).

5. The medical dental three-in-one gun according to claim 1, characterized in that: An avoidance communication groove (315) is provided at a middle position on the outer side of the valve body (31), the avoidance communication groove (315) is arranged around the outer circumference of the valve body (31), the output end of the valve outlet (313) is connected to the avoidance communication groove (315), and the avoidance communication groove (315) is configured to always maintain communication with the input end of the first channel (12).

6. The medical dental three-in-one gun according to claim 1, characterized in that: The valve stem (34) comprises an operating head (341), a first guide portion (342), a linkage rod (343) and a mounting head (344) which are connected in sequence from top to bottom. The top of the operating head (341) is located outside the gun body (1). The compression spring (32) is sleeved on the linkage rod (343). The valve sealing ring (33) is sleeved on the mounting head (344).

7. The medical dental three-in-one gun according to claim 6, characterized in that: A first groove is provided on the outer peripheral surface of the mounting head (344) and is arranged circumferentially around the mounting head (344); the inner ring of the valve sealing ring (33) is matched and embedded in the first groove; and the cross-sectional shape of the valve sealing ring (33) and the cross-sectional shape of the first groove are both square.

8. A medical dental three-in-one gun according to any one of claims 1 to 7, characterized in that: The valve (3) further comprises a lower sealing ring (35) sleeved on the valve body (31); a lower groove located below the avoidance communication groove (315) is provided on the outer side of the valve body (31); the outer ring of the lower sealing ring (35) abuts against the groove wall of the switch groove (14); the inner ring is embedded in the lower groove; the lower sealing ring (35) is used to cooperate with the lower outer side of the valve body (31) and the groove wall of the switch groove (14) to seal.

9. A medical dental three-in-one gun according to any one of claims 1 to 7, characterized in that: The valve (3) further comprises a second sealing ring (36), the second sealing ring (36) being sleeved on a first guide portion (342) of the valve stem (34), the outer ring of the second sealing ring (36) abutting against a groove wall of the switch groove (14), the inner ring of the second sealing ring (36) abutting against an outer peripheral surface of the first guide portion (342), and the bottom surface of the second sealing ring (36) abutting against a top surface of the valve body (31).

10. The medical dental three-in-one gun according to claim 9, characterized in that: The valve (3) further comprises a limit ring (37) which prevents the valve body (31) from moving in the direction of the switch notch; the limit ring (37) is sleeved on the first guide portion (342) of the valve stem (34) and abuts against the top surface of the second sealing ring (36).

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