A gas control valve applied to a dental treatment device

Abstract

An air control valve for use in dental treatment equipment includes a valve seat and a core seat, with the core seat installed within a mounting hole in the valve seat. An air inlet chamber and an air outlet chamber are provided between the inner wall of the mounting hole and the outer wall of the core seat. The outer wall of the valve seat has an air inlet communicating with the air inlet chamber and an air outlet communicating with the air outlet chamber. A valve core is installed within a telescopic hole in the core seat, the telescopic hole including a blocking section, an air outlet section, and an air inlet section connected sequentially along the axial direction. The air inlet section has an air inlet port communicating with the air inlet chamber, and the air outlet section has an air outlet port communicating with the air outlet chamber. The front end of the valve core extends out of the valve seat through a through-hole. This separate structure combining the valve seat and core seat allows the valve seat to be injection molded or cast from low-cost materials, reducing the amount of brass used. Furthermore, since the valve seat is injection molded or cast, complex precision machining is unnecessary, improving production efficiency and achieving the goal of reducing raw material and manufacturing costs, effectively meeting the needs of large-scale production.

Description

Technical Field

[0001] This utility model relates to the field of dental treatment equipment technology, and specifically to a gas control valve applied to dental treatment equipment. Background Technology

[0002] The instrument table of dental treatment equipment holds a pneumatic handpiece via a hanger base, and a hanger valve is installed on the hanger base to control the air supply to the pneumatic handpiece.

[0003] For example, Chinese utility model patent with patent number CN202420136582.5 discloses a dental treatment instrument table, whose valve structure includes a generally square integral valve body. This valve body is usually made of brass. In this way, the characteristics of brass being easy to precision machine can be used to process complex internal cavities and channels, while the good wear resistance and self-lubricating properties of brass can also be used to ensure the reliability of the internal spindle during long-term and frequent operation.

[0004] However, this unibody brass valve body structure requires multiple precision machining processes such as milling and drilling on the brass blank, necessitating specialized equipment and multiple clamping operations, which increases manufacturing costs and labor time, resulting in high per-piece processing costs. Furthermore, as brass is a relatively expensive metal, the use of brass as a whole also increases raw material costs, making this technical solution economically suitable only for small-batch production, severely limiting its cost control and promotion potential in large-scale market applications. Utility Model Content

[0005] In order to overcome the shortcomings of the prior art, this utility model provides a gas control valve for use in dental treatment equipment.

[0006] The technical solution adopted by this utility model to solve its technical problem is: A gas control valve for use in dental treatment equipment, characterized in that: it includes a valve seat and a core seat, wherein the front and rear ends of the valve seat are respectively provided with a through hole and a mounting hole, and the through hole and the mounting hole are axially connected; The core seat is installed in the mounting hole; an air inlet chamber and an air outlet chamber are provided between the inner wall of the mounting hole and the outer wall of the core seat; the outer wall of the valve seat is provided with an air inlet communicating with the air inlet chamber and an air outlet communicating with the air outlet chamber. The core seat is provided with a telescopic hole, and a valve core is installed in the telescopic hole. The telescopic hole includes a blocking section, an outlet section, and an inlet section that are connected sequentially along the axial direction. The inlet section is provided with an inlet hole that communicates with the inlet chamber, and the outlet section is provided with an outlet hole that communicates with the outlet chamber. One end of the blocking section passes through the core seat and corresponds to the through hole. The front end of the valve core passes through the through hole and extends out of the valve seat. An elastic element is installed in the telescopic hole to push the valve core out of the valve seat using elastic force. The telescopic hole is provided with a mating position for cooperating with the valve core to realize the opening and closing between the outlet section and the inlet section.

[0007] In this invention, a pressure handle is hinged to the valve seat for pushing the valve core back into the telescopic hole.

[0008] In this utility model, the valve core includes a valve stem that is telescopically and slidably fitted in the telescopic hole and a sealing element fitted outside the valve stem. The front end of the valve stem extends out of the valve seat through the through hole. The mating position includes a sealing ring surface located between the air outlet section and the air inlet section.

[0009] In this utility model, the valve stem includes a drive rod and a guide rod connected sequentially along the axial direction. The drive rod is slidably matched in the air-blocking section and one end extends out from the through hole. The guide rod is slidably disposed in the air outlet section and the air inlet section, and its outer wall is slidably engaged with the inner wall of the air inlet section. The outer wall of the guide rod is provided with a ventilation recess. The sealing element is a sealing rubber ring fitted outside the guide rod.

[0010] In this invention, a drive sealing ring is fitted around the drive rod, and the drive sealing ring is used to make contact with the inner wall of the air-blocking section.

[0011] In this utility model, the outer wall of the core seat is provided with an air inlet annular groove and an air outlet annular groove, wherein the air inlet annular groove and the inner wall of the mounting hole combine to form the air inlet cavity, and the air outlet annular groove and the inner wall of the mounting hole form the air outlet cavity.

[0012] In this utility model, the valve seat is provided with an air inlet connector and an air outlet connector integrally formed therewith. The air inlet extends through the air inlet connector, and the air outlet extends through the air outlet connector.

[0013] In this utility model, the core seat is fitted with a plurality of mounting sealing rings arranged from front to back. The air inlet chamber is located between adjacent mounting sealing rings, and the air outlet chamber is located between adjacent mounting sealing rings. The air inlet chamber and the air outlet chamber are isolated by at least one of the mounting sealing rings.

[0014] In this utility model, the valve seat is provided with a locking elongated hole, the length of which extends from front to back, and the core seat is provided with a locking screw hole for engaging with the locking elongated hole, and a fastening bolt threaded into the locking elongated hole is inserted therethrough.

[0015] In this invention, the valve seat is formed by injection molding or casting; and / or, the core seat is made of brass.

[0016] The beneficial effects of this utility model are as follows: This utility model adopts a split structure combining a valve seat and a core seat, which allows the valve seat to be injection molded or cast from low-cost materials, reducing the amount of brass used. Moreover, since the valve seat is injection molded or cast, there is no need for complex precision machining, which improves production efficiency and achieves the goal of reducing raw material and manufacturing costs, effectively meeting the needs of large-scale production. Attached Figure Description

[0017] The present invention will be further described below with reference to the accompanying drawings and embodiments: Figure 1 A 3D view of the air control valve; Figure 2 Cross-section of the control valve Figure 1 ; Figure 3 Cross-section of the control valve Figure 2 ; Figure 4 This is a schematic diagram of the valve core and its seat assembly. Figure 5 Explosion of the gas control valve Figure 1 ; Figure 6 Explosion of the gas control valve Figure 2 . Detailed Implementation

[0018] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings.

[0019] It should be noted that if any directional indication (such as up, down, left, right, front, back, top, bottom, inside, outside, vertical, horizontal, longitudinal, counterclockwise, clockwise, circumferential, radial, axial, etc.) is involved in the embodiments of this utility model, the directional indication is only used to explain the relative positional relationship and movement of each component in a certain specific posture (as shown in the figure). If the specific posture changes, the directional indication will also change accordingly.

[0020] Furthermore, unless otherwise explicitly specified and limited, the terms "set up," "install," "connect," and "link" should be interpreted broadly. For example, they can refer to a fixed connection using welding, a detachable connection using bolts, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0021] Furthermore, if the embodiments of this utility model involve descriptions such as "first" or "second," such descriptions are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, features defined with "first" or "second" may explicitly or implicitly include at least one of those features. Additionally, the technical solutions of the various embodiments can be combined with each other, but this must be based on the ability of those skilled in the art to implement them. When the combination of technical solutions is contradictory or impossible to implement, such a combination of technical solutions should be considered non-existent and not within the scope of protection claimed by this utility model.

[0022] Reference Figure 1-6 A control valve for use in dental treatment equipment includes a valve seat 1 formed by injection molding or casting and a core seat 2 made of brass. The valve seat 1 has a through hole 11 and a mounting hole 12 at its front and rear ends, respectively, with the through hole 11 axially connected to the mounting hole 12. The valve seat 1 can be made of engineering plastic, aluminum alloy, or stainless steel, preferably aluminum alloy, which is lightweight, has low casting cost, and high strength. The core seat 2 is made of brass, utilizing the easy processing and wear resistance of brass to ensure the processing quality of the core seat 2 and its long-term stable use. The core seat 2 is fixedly installed in the mounting hole 12. The inner wall of the mounting hole 12 is sealed to the outer wall of the core seat 2 and has an air inlet chamber 100 and an air outlet chamber 200. The outer wall of the valve seat 1 has an air inlet 13 communicating with the air inlet chamber 100 and an air outlet 14 communicating with the air outlet chamber 200.

[0023] Furthermore, the core seat 2 is provided with a telescopic hole, and a telescopic valve core is installed in the telescopic hole. The telescopic hole includes an air-blocking section 21, an air-out section 22, and an air-in section 23 connected sequentially along the axial direction. The air-in section 23 is provided with an air-inlet hole 24 communicating with the air-inlet chamber 100, and the air-out section 22 is provided with an air-outlet hole 25 communicating with the air-outlet chamber 200. One end of the air-blocking section 21 passes through the core seat 2 and corresponds to the through-hole 11. The front end of the valve core passes through the through-hole 11 and extends out of the valve seat 1. The valve seat 1 is hinged with a handle 3 for pushing the valve core back into the telescopic hole. In other embodiments, the valve core can also be directly contacted with the handpiece of the dental treatment device to achieve the action. An elastic element 4 is installed in the telescopic hole to push the valve core out of the valve seat 1 using elastic force. The telescopic hole is provided with a mating position for cooperating with the valve core to realize the opening and closing between the air-out section 22 and the air-inlet section 23.

[0024] Furthermore, the valve core includes a valve stem 5 that is telescopically and slidably fitted in the telescopic hole and a sealing element 6 fitted outside the valve stem 5. The front end of the valve stem 5 extends out of the valve seat 1 through the through hole 11. The mating position includes a sealing ring surface 300 located between the air outlet section 22 and the air inlet section 23. When the valve stem 5 is pushed back by the pressure handle 3 until the sealing element 6 is tightly attached to the sealing ring surface 300, the passage between the air outlet section 22 and the air inlet section 23 is disconnected, and the elastic element 4 is compressed. When the external force is removed, the elastic element 4 resets and pushes the valve stem 5 to extend, causing the sealing element 6 to separate from the mating position and reconnecting the air outlet section 22 and the air inlet section 23.

[0025] In this embodiment, the outer surface of the valve seat 1 is integrally formed with a lightweight groove 15, which is used to reduce the overall weight of the air valve and the cost of manufacturing materials.

[0026] In this embodiment, the valve stem 5 includes a drive rod 51 and a guide rod 52 connected sequentially along the axial direction. The drive rod 51 is slidably matched in the air-blocking section 21 and one end extends out from the through hole 11. The guide rod 52 is slidably disposed in the air outlet section 22 and the air inlet section 23, and its outer wall is slidably engaged with the inner wall of the air inlet section 23. A venting recess 53 is provided on the outer wall of the guide rod 52, and a venting channel 400 is formed between the venting recess 53 and the inner wall of the air outlet section 22. When the air outlet section 22 is connected to the air inlet section 23, the gas flows into the air inlet section 23, then flows through the venting channel 400 to the air outlet section 22, and then flows from the air outlet section 22 to the air outlet 14, thereby realizing the venting function.

[0027] In this embodiment, the sealing element 6 is a sealing ring outside the guide rod 52. The guide rod 52 is provided with a first annular groove 54 for installing the sealing ring, and the inner ring of the sealing ring is embedded in the first annular groove 54.

[0028] In this embodiment, the elastic element 4 is a compression spring, with one end pressing against the rear end of the valve stem 5 and the other end abutting against the inner wall end face of the air intake section 23. Furthermore, to improve the fit between the elastic element 4 and the valve stem 5, a spring positioning protrusion protrudes from the rear end of the valve stem 5. This spring positioning protrusion is inserted into the inner coil of the compression spring, thereby positioning them relative to each other.

[0029] In this embodiment, a drive sealing ring 7 is fitted around the drive rod 51. The drive sealing ring 7 is used to fit and contact the inner wall of the air-blocking section 21 to prevent gas leakage from the air-blocking section 21. Furthermore, a second annular groove 55 is provided on the outer periphery of the drive rod 51, and the inner ring of the drive sealing ring 7 is embedded in the second annular groove 55.

[0030] In this embodiment, the valve seat 1 is provided with a pressure relief hole 16, which is connected to the front end of the mounting hole 12 and located below the through hole 11. The pressure relief hole 16 is used to release the pressure that may be generated when the core seat 2 is installed into the mounting hole 12, so as to avoid the core seat 2 not being installed properly or the seal failing due to pressure accumulation. In addition, the pressure relief hole 16 can also release the air pressure that may be generated when the valve stem 5 moves to drive the sealing ring 7. Furthermore, the front end surface of the core seat 2 is also provided with a pressure relief groove 26, which is connected to the pressure relief hole 16 and the air-blocking section 21 to facilitate pressure relief.

[0031] In this embodiment, the outer wall of the core seat 2 is provided with an air inlet annular groove 27 and an air outlet annular groove 28. The air inlet annular groove 27 and the air outlet annular groove 28 are both arranged around the outer periphery of the core seat 2. The air inlet annular groove 27 and the inner wall of the mounting hole 12 combine to form the air inlet cavity 100, and the air outlet annular groove 28 and the inner wall of the mounting hole 12 form the air outlet cavity 200.

[0032] In this embodiment, the valve seat 1 is integrally formed with an air inlet connector 17 and an air outlet connector 18. The air inlet 13 extends through the air inlet connector 17, and the air outlet 14 extends through the air outlet connector 18. Both the air inlet connector 17 and the air outlet connector 18 are provided with multiple protruding retaining rings on their exteriors for securing air pipes. By integrally forming the air inlet connector 17 and the air outlet connector 18 with the valve seat 1, no external connectors are required, thereby improving assembly efficiency and reducing costs.

[0033] In this embodiment, the core seat 2 is fitted with a plurality of mounting sealing rings 8 arranged from front to back. The air inlet chamber 100 is located between adjacent mounting sealing rings 8, and the air outlet chamber 200 is located between adjacent mounting sealing rings 8. At least one mounting sealing ring 8 is used to isolate the air inlet chamber 100 and the air outlet chamber 200, thereby ensuring the sealing quality between the inner wall of the mounting hole 12 and the outer wall of the core seat 2. Furthermore, the outer wall of the core seat 2 is provided with a plurality of annular grooves 29 for mounting the sealing rings 8. The plurality of annular grooves 29 are arranged from front to back, and each annular groove 29 corresponds to a mounting sealing ring 8, effectively preventing gas leakage along the outer wall of the core seat 2.

[0034] In this embodiment, the core seat 2 is adjustablely fixed to the valve seat 1, allowing for fine-tuning of its position relative to the valve seat 1 according to different installation requirements. Specifically, the valve seat 1 has a locking elongated hole 19 extending from front to back. The core seat 2 has a locking screw hole for engaging with the locking elongated hole 19. A fastening bolt 9, threaded into the locking elongated hole 19, is inserted into the locking elongated hole 19. Loosening the fastening bolt 9 allows adjustment of the core seat 2's position within the mounting hole 12, thus eliminating the impact of casting errors on the installation quality of the core seat 2. Furthermore, one end of the locking elongated hole 19 extends through the rear end of the valve seat 1, allowing the fastening bolt 9 to be inserted into the locking elongated hole 19 without completely separating it from the core seat 2, through the through-hole at the rear end of the locking elongated hole 19.

[0035] In this embodiment, the valve seat 1 has two protruding hinge portions. One end of the pressure handle 3 extends between the two hinge portions and is hinged to the valve seat 1 by a pivot, thereby completing the installation of the pressure handle 3. In addition, the bottom of the valve seat 1 has at least two connection holes for mounting the air control valve on dental treatment equipment with bolts.

[0036] The above description is only a preferred embodiment of the present utility model. Any technical solution that achieves the purpose of the present utility model by essentially the same means shall fall within the protection scope of the present utility model.

Claims

1. A gas control valve used in dental treatment equipment, characterized in that: It includes a valve seat (1) and a core seat (2). The valve seat (1) has a through hole (11) and a mounting hole (12) at its front and rear ends, respectively. The through hole (11) and the mounting hole (12) are axially connected. The core seat (2) is installed in the mounting hole (12); an air inlet chamber (100) and an air outlet chamber (200) are provided between the inner wall of the mounting hole (12) and the outer wall of the core seat (2); the outer wall of the valve seat (1) is provided with an air inlet (13) communicating with the air inlet chamber (100) and an air outlet (14) communicating with the air outlet chamber (200); The core seat (2) is provided with a telescopic hole, and a valve core is installed in the telescopic hole. The telescopic hole includes a blocking section (21), an outlet section (22) and an inlet section (23) connected in sequence along the axial direction. The inlet section (23) is provided with an inlet hole (24) connected to the inlet chamber (100). The outlet section (22) is provided with an outlet hole (25) connected to the outlet chamber (200). One end of the blocking section (21) passes through the core seat (2) and corresponds to the through hole (11). The front end of the valve core passes through the through hole (11) and extends out of the valve seat (1). An elastic element (4) is installed in the telescopic hole to push the valve core out of the valve seat (1) by elastic force. The telescopic hole is provided with a mating position for cooperating with the valve core to realize the opening and closing between the outlet section (22) and the inlet section (23).

2. The air control valve for use in dental treatment equipment according to claim 1, characterized in that: The valve seat (1) is hinged with a pressure handle (3) for pushing the valve core back into the telescopic hole.

3. The air control valve for use in dental treatment equipment according to claim 1, characterized in that: The valve core includes a valve stem (5) that is telescopically and slidably fitted in the telescopic hole and a seal (6) fitted outside the valve stem (5). The front end of the valve stem (5) extends out of the valve seat (1) through the through hole (11). The mating position includes a sealing annular surface (300) located between the air outlet section (22) and the air inlet section (23).

4. The air control valve for use in dental treatment equipment according to claim 3, characterized in that: The valve stem (5) includes a drive rod (51) and a guide rod (52) connected in sequence along the axial direction. The drive rod (51) is slidably matched in the air-blocking section (21) and one end extends out from the through hole (11). The guide rod (52) is slidably arranged in the air outlet section (22) and the air inlet section (23). Its outer wall is slidably matched with the inner wall of the air inlet section (23). The outer wall of the guide rod (52) is provided with a ventilation recess (53). The sealing element (6) is a sealing ring fitted outside the guide rod (52).

5. The air control valve for use in dental treatment equipment according to claim 4, characterized in that: The drive rod (51) is fitted with a drive sealing ring (7), which is used to make contact with the inner wall of the air-blocking section (21).

6. The air control valve for use in dental treatment equipment according to claim 1, characterized in that: The outer wall of the core seat (2) is provided with an air inlet annular groove (27) and an air outlet annular groove (28). The air inlet annular groove (27) and the inner wall of the mounting hole (12) are combined to form the air inlet chamber (100), and the air outlet annular groove (28) and the inner wall of the mounting hole (12) are combined to form the air outlet chamber (200).

7. The air control valve for use in dental treatment equipment according to claim 1, characterized in that: The valve seat (1) is provided with an air inlet connector (17) and an air outlet connector (18) integrally formed therewith. The air inlet (13) extends through the air inlet connector (17), and the air outlet (14) extends through the air outlet connector (18).

8. The air control valve for use in dental treatment equipment according to claim 1, characterized in that: The core seat (2) is fitted with a plurality of mounting sealing rings (8) arranged from front to back. The air inlet chamber (100) is located between adjacent mounting sealing rings (8) at the front and back, and the air outlet chamber (200) is located between adjacent mounting sealing rings (8) at the front and back. The air inlet chamber (100) and the air outlet chamber (200) are isolated by at least one of the mounting sealing rings (8).

9. A gas control valve for use in dental treatment equipment according to claim 1, characterized in that: The valve seat (1) is provided with a locking elongated hole (19), the length of which extends from front to back. The core seat (2) is provided with a locking screw hole for cooperating with the locking elongated hole (19), and a fastening bolt (9) threaded into the locking elongated hole (19) is inserted.

10. A gas control valve for use in dental treatment equipment according to any one of claims 1-9, characterized in that: The valve seat (1) is formed by injection molding or casting; and / or the core seat (2) is made of brass.

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