A valve stem, water gas control valve, endoscope operation unit, and endoscope

Abstract

The embodiment of the present application provides a valve rod, a water and gas control valve, a scope operating part and a scope, and relates to the technical field of the scope. The valve rod comprises a first valve rod section, a second valve rod section and a third valve rod section, a first sealing ring is sleeved on the first valve rod section, the second valve rod section is detachably connected to the first valve rod section, a second sealing ring is sleeved on the second valve rod section, and the third valve rod section is detachably connected to the second valve rod section, and a third sealing ring is sleeved on the third valve rod section. The embodiment of the present application can reduce damage to each sealing ring, so that the valve body and the valve rod have better sealing performance, thereby preventing the phenomenon of liquid leakage or air leakage.

Description

Technical Field

[0001] This application relates to the field of endoscope technology, and in particular to a valve stem, a water-air control valve, an endoscope operating part, and an endoscope. Background Technology

[0002] The water-air control valve is a structural component in an endoscope used to control the on / off state of the air and water circuits. The water-air control valve typically includes a valve stem and a valve body. The purpose of switching between the air and water circuits can be achieved by moving the valve stem inside the valve body.

[0003] To prevent air or water leakage, multiple sealing rings are typically installed around the outer circumference of the valve stem. These sealing rings are spaced apart along the axial direction of the valve stem, ensuring a tight connection between the valve stem and the valve body during movement. The valve stem is usually a one-piece, rod-shaped structure of a certain length. During the installation of the sealing rings, they need to be fitted from the end of the valve stem. The sealing rings must withstand significant tension or experience considerable friction with the valve stem surface to achieve proper assembly. This process can affect the performance of the sealing rings, thereby reducing the sealing effect between the valve stem and the valve body. Utility Model Content

[0004] This application provides a valve stem, a water / gas control valve, an endoscope operation, and an endoscope, which can reduce damage to various sealing rings, thereby improving the sealing performance between the valve body and the valve stem and preventing liquid or gas leakage.

[0005] The first aspect of this application provides a valve stem, comprising:

[0006] A first valve stem section, on which a first sealing ring is fitted;

[0007] The second valve stem section is detachably connected to the first valve stem section, and a second sealing ring is fitted on the second valve stem section;

[0008] The third valve stem section is detachably connected to the second valve stem section, and a third sealing ring is fitted on the third valve stem section. The first sealing ring, the second sealing ring and the third sealing ring are spaced apart along the axial direction of the valve stem.

[0009] According to the valve stem described in the first aspect of this application, the valve stem is designed in a segmented manner, consisting of a first valve stem segment, a second valve stem segment, and a third valve stem segment. During the overall assembly of the valve stem, the first sealing ring, the second sealing ring, and the third sealing ring can be assembled onto the first valve stem segment, the second valve stem segment, and the third valve stem segment respectively, and then the connection of the first valve stem segment, the second valve stem segment, and the third valve stem segment can be completed. During the entire assembly process of the valve stem, the tension or friction experienced by each sealing ring can be significantly reduced, thereby reducing damage to each sealing ring and resulting in better sealing performance between the valve body and the valve stem, thus preventing leakage of liquid or air.

[0010] In one possible implementation, the first valve stem segment and the second valve stem segment can be connected by at least one of butt joint or plug joint; the second valve stem segment and the third valve stem segment can be connected by at least one of butt joint or plug joint.

[0011] In one possible implementation, the second valve stem segment includes a first end and a second end, the first end being inserted into the first valve stem segment and the second end being inserted into the third valve stem segment.

[0012] In one possible implementation, the first valve stem segment includes a first insertion channel, with the first end inserted into the first insertion channel, and the third valve stem segment includes a second insertion channel, with the second end inserted into the second insertion channel.

[0013] In one possible implementation, the second valve stem segment includes a first segment, a second segment, and an intermediate segment connected between the first segment and the second segment, the end of the first segment forming the first end, the end of the second segment forming the second end, the first segment being threadedly connected to the first insertion channel, and the second segment being threadedly connected to the second insertion channel.

[0014] In one possible implementation, the first sealing ring is disposed at the end of the first valve stem segment, the second sealing ring is disposed on the second segment of the second valve stem segment, the outer diameter of the second segment gradually decreases in the direction away from the first end, and the third sealing ring is disposed at the end of the third valve stem segment.

[0015] In one possible implementation, a pressure relief channel is formed inside the second valve stem section, the pressure relief channel including a pressure relief inlet and a pressure relief outlet, the pressure relief inlet being located between the first seal and the second sealing ring, and the pressure relief outlet being located at the first end.

[0016] In one possible implementation, the valve stem further includes a guide member sleeved on the second valve stem segment, the guide member being positioned close to either the first or second sealing ring.

[0017] In one possible implementation, a first limiting part is provided on the first valve stem segment, and a second limiting part is provided on the second valve stem segment. The first limiting part is used to abut against a third limiting part on the valve body, and the second limiting part is used to abut against a fourth limiting part on the valve body.

[0018] In one possible implementation, the valve stem further includes a venting seal ring fitted onto the second valve stem segment, the venting seal ring being disposed between the first seal ring and the second seal ring, and the venting seal ring including a venting inclined wall inclined to the axial direction.

[0019] A second aspect of this application provides a water-gas control valve, comprising:

[0020] The valve body has a moving channel and an air inlet, an air outlet, a water inlet, and a water outlet communicating with the moving channel;

[0021] The valve stem is movably disposed within the moving channel, and the valve stem has at least a first position on its moving path that connects the air inlet and the air outlet and disconnects the water inlet and the water outlet, and a second position that disconnects the air inlet and the air outlet and connects the water inlet and the water outlet.

[0022] According to the water-gas control valve described in the second aspect of this application, the water-gas control valve includes a valve body and a valve stem. The movement of the valve stem within the valve body allows for the selective transmission of gas or water to the endoscope body. Because the valve stem employs a segmented design, the assembly of the sealing ring is simplified, reducing damage to the sealing ring and resulting in better sealing performance between the valve body and the valve stem, thereby preventing leakage of liquid or gas.

[0023] In one possible implementation, the valve stem is provided with a first limiting part and a second limiting part, the valve body is provided with a third limiting part and a fourth limiting part, and the water-gas control valve further includes an elastic element for holding the valve stem in the first position. When the valve stem is in the first position, the first limiting part abuts against the third limiting part, and when the valve stem is in the second position, the second limiting part abuts against the fourth limiting part.

[0024] In one possible implementation, the air outlet, the air inlet, the water outlet, and the water inlet are arranged sequentially from top to bottom. When the valve stem is in the first position, the air outlet and the air inlet are located between the first sealing ring and the second sealing ring, the water outlet is located between the second sealing ring and the third sealing ring, and the water inlet is located below the third sealing ring. When the valve stem is in the second position, the air outlet and the air inlet are blocked by the third limiting part and the fourth limiting part, and the water outlet and the water inlet are located between the second sealing ring and the third sealing ring.

[0025] A third aspect of this application provides an endoscope operating unit, including the water and air control valve described in the second aspect.

[0026] The fourth aspect of this application provides an endoscope including the endoscope operating section described in the third aspect. Attached Figure Description

[0027] The accompanying drawings, which are incorporated in and form part of this specification, illustrate embodiments consistent with this application and, together with the description, serve to explain the principles of this application.

[0028] Figure 1 A schematic diagram of the structure of an endoscope provided according to an embodiment of this application is shown;

[0029] Figure 2 A schematic diagram of the structure of an endoscope operating section provided according to an embodiment of this application is shown;

[0030] Figure 3 This diagram shows an assembly schematic of a water vapor control valve on an endoscope operating section according to an embodiment of this application;

[0031] Figure 4 A schematic diagram of the structure of a water-gas control valve according to an embodiment of this application is shown;

[0032] Figure 5 A schematic diagram of a valve stem according to an embodiment of this application is shown;

[0033] Figure 6 An exploded schematic diagram of a valve stem provided according to an embodiment of this application is shown.

[0034] Figure label:

[0035] 100-Valve body; 101-Moving channel; 102-Air inlet; 103-Air outlet; 104-Water inlet; 105-Water outlet; 110-First valve body; 120-Second valve body; 130-Third limiting part; 140-Fourth limiting part; 131-Second flange; 141-Second inclined surface;

[0036] 200-Valve stem; 201-First limiting part; 202-Second limiting part; 2011-First flange; 2021-First inclined surface; 210-First valve stem section; 220-Second valve stem section; 230-Third valve stem section; 240-First sealing ring; 250-Second sealing ring; 260-Third sealing ring; 270-Ventilation sealing ring; 280-Plug assembly; 290-Guide component; 211-First insertion channel; 221-First end; 222-Second end; 223-First section; 224-Second section; 225-Intermediate section; 226-Pressure relief channel; 231-Second insertion channel; 271-Ventilation inclined wall; 2261-Pressure relief inlet; 2262-Pressure relief outlet;

[0037] 300 - Elastic component;

[0038] 10-Outer shell;

[0039] 20 - Water and gas control valve;

[0040] 30 - Air delivery channel;

[0041] 40 - Water guiding channel;

[0042] 1000-Endoscope main unit;

[0043] 2000 - Endoscope interface device; 2100 - Light guide section; 2200 - Endoscope operating section; 2300 - Insertion section;

[0044] 3000 - Endoscope body;

[0045] 1-Endoscope.

[0046] The accompanying drawings have illustrated specific embodiments of this application, which will be described in more detail below. These drawings and descriptions are not intended to limit the scope of the concept in any way, but rather to illustrate the concept of this application to those skilled in the art through reference to specific embodiments. Detailed Implementation

[0047] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0048] An endoscope is a mechanical device with an image sensor, optical lens, and optical illumination. It allows for the observation, diagnosis, and treatment of organs such as the intestines and stomach. To assist the optical lens in capturing images, endoscopes typically also have interfaces for supplying water, air, or a mixture of both, as well as suction interfaces for drawing water or air. In short, an endoscope is a structure that integrates multiple functions.

[0049] To simplify the structure and ensure smooth air and water supply, the endoscope operating unit is typically equipped with a water-air control valve. This valve connects to both the air pump and the water supply unit, allowing both gas and water to enter. The water-air control valve is a structural component in the endoscope used to control the on / off flow of air and water. It typically consists of a valve stem and a valve body. Movement of the valve stem within the valve body switches between the air and water pathways, allowing selective delivery of either gas or water to the endoscope.

[0050] In related technologies, to prevent air or water leakage, multiple sealing rings are typically installed around the outer circumference of the valve stem. These sealing rings are spaced apart along the axial direction of the valve stem, ensuring a tight connection between the valve stem and the valve body during movement. The valve stem is usually a one-piece, rod-shaped structure of a certain length. During the installation of the sealing rings, they need to be fitted from the end of the valve stem. The sealing rings must withstand significant tension or experience considerable friction with the valve stem surface to achieve proper assembly. This process can affect the performance of the sealing rings, thereby reducing the sealing effect between the valve stem and the valve body.

[0051] Based on the above situation and problems, this application provides a valve stem with a segmented design. The valve stem may include multiple valve stem segments, which can be combined and connected to form a whole valve stem.

[0052] Understandably, since the valve stem consists of multiple valve stem segments, when it is necessary to assemble the sealing ring, the sealing ring can be first assembled onto each valve stem segment, and then the valve stem segments can be connected into a whole valve stem to achieve the assembly of the sealing ring. The valve stem segments have a smaller axial dimension than the whole valve stem, which can avoid the sealing ring from being subjected to large tension or large friction, reduce damage to the sealing ring, and thus improve the sealing effect between the valve stem and the valve body.

[0053] The following embodiments will illustrate the main design concept of the valve stem in this application from scenarios such as endoscope, endoscope operating part, and water-gas control valve.

[0054] Based on the above-mentioned valve stem, this application embodiment also provides a water-gas control valve, which includes the above-mentioned valve body and valve stem. By moving the valve stem in the valve body, the water-gas control valve can control the opening and closing of the gas path and the opening and closing of the water path, so that gas or water can be selectively transmitted to the endoscope body.

[0055] The water-gas control valve in this embodiment adopts a segmented design for the valve stem, which simplifies the assembly of the sealing ring and reduces damage to the sealing ring. This results in better sealing performance between the valve body and the valve stem, thereby preventing liquid or gas leakage.

[0056] Based on the aforementioned water and gas control valve, this application embodiment also provides an endoscope operation unit 2200, which includes the aforementioned water and gas control valve and can effectively prevent leakage of liquid or gas.

[0057] Figure 1 A schematic diagram of the structure of an endoscope 1 provided according to an embodiment of this application is shown.

[0058] This application embodiment also provides an endoscope 1, which includes the endoscope operation unit 2200 described above.

[0059] Please refer to Figure 1 The endoscope 1, as a core device for medical diagnosis and treatment, mainly includes an endoscope main unit 1000, an endoscope interface device 2000, and an endoscope body 3000. During treatment, the endoscope main unit 1000 is located outside the human body, while the endoscope body 3000 can be inserted into the human body. The endoscope body 3000 and the endoscope main unit 1000 are connected through the endoscope interface device 2000. The endoscope interface device 2000 may include a light guide 2100, an endoscope operation unit 2200, and an insertion unit 2300. The light guide 2100 can be inserted into the endoscope main unit 1000, and the insertion unit 2300 can be inserted into the cavity of the corresponding organ in the human body. The endoscope main unit 1000 is typically equipped with an image processor, a light source assembly, and an air pump, while the light guide section 2100 is typically equipped with an imaging fiber optic assembly, a light guide assembly, and the aforementioned interfaces, and the endoscope body 3000 is equipped with an optical lens and other structures.

[0060] When the endoscope is working, the light source component in the endoscope host 1000 can transmit the light source to the endoscope body 3000 through the endoscope body interface device 2000, and the air pump and other components in the endoscope host 1000 can introduce gas into the endoscope body 3000 through the endoscope body interface device 2000.

[0061] The specific structures of the endoscope host 1000, the endoscope interface device 2000, and the endoscope body 3000 can be referred to in related technologies, and this application does not limit them.

[0062] Figure 2 A schematic diagram of the structure of an endoscope operation unit 2200 provided according to an embodiment of this application is shown; Figure 3 A schematic diagram of the assembly of a water vapor control valve 20 on an endoscope operating section 2200 according to an embodiment of this application is shown.

[0063] In the embodiments of this application, please refer to Figure 2 and Figure 3 The endoscope operating unit 2200 includes a housing 10 and a water / air control valve 20 nested within the housing 10. Furthermore, the endoscope operating unit 2200 also includes an air guide channel 30 and a water guide channel 40 (see reference). Figure 4 ).

[0064] The water-gas control valve 20 includes a valve body 100 and a valve stem 200. The valve body 100 surrounds the outer periphery of the valve stem 200. The valve body 100 has a moving channel 101. The valve stem 200 adopts the above-mentioned segmented design.

[0065] The valve body 100 also has an air inlet 102 (see reference). Figure 4 ), air outlet 103, water inlet 104 (for reference) Figure 4 The air inlet 102 and the air outlet 103 are connected to form an air passage, and the water inlet 104 and the water outlet 105 are connected to form a water passage. The opening and closing of the air passage and the water passage can be controlled by the movement of the valve stem 200 in the valve body 100, so that gas or water can be selectively transmitted to the endoscope body.

[0066] Therefore, the valve stem 200 in this embodiment has at least a first position on the moving path that connects the air inlet 102 and the air outlet 103 and disconnects the water inlet 104 and the water outlet 105, and a second position that disconnects the air inlet 102 and the air outlet 103 and connects the water inlet 104 and the water outlet 105.

[0067] Therefore, when the valve stem 200 is in the first position, the air passage is connected and the water passage is disconnected, allowing gas to be delivered to the endoscope body 3000. When the valve stem 200 is in the second position, the air passage is disconnected and the water passage is connected, allowing water to be delivered to the endoscope body 3000.

[0068] Under normal circumstances, valve stem 200 should remain in the first position. When water needs to be introduced, valve stem 200 can be switched to the second position. The position can be switched by the operator pressing one end of the valve stem 200 that extends out of the endoscope operating part 2200.

[0069] In this embodiment, to keep the valve stem 200 in the first position, an elastic element 300 can be provided between the valve body 100 and the valve stem 200. The elastic force of the elastic element 300 can drive the valve stem 200 to remain in the first position. The following embodiment provides information on the arrangement of the elastic element 300.

[0070] In this embodiment, the water-gas control valve 20 includes a valve body 100 and a valve stem 200. The movement of the valve stem 200 within the valve body 100 allows for the selective transmission of gas or water to the endoscope body 3000. Because the valve stem 200 employs a segmented design, the assembly of the sealing ring is simplified, reducing damage to the sealing ring and resulting in better sealing performance between the valve body 100 and the valve stem 200, thus preventing leakage of liquid or gas.

[0071] In some embodiments, the valve body 100 may also adopt a segmented design, for example, in Figure 3 In the example shown, the valve body 100 includes a first valve body 110 and a second valve body 120, wherein the first valve body 110 and the second valve body 120 can be connected by means of threaded connection or other methods. The segmented design can simplify the overall manufacturing and assembly of the valve body 100.

[0072] Furthermore, as can be seen from the following embodiments, the segmented design also facilitates the formation of a third limiting portion 130 and / or a fourth limiting portion 140 inside the valve body 100, which can be understood with reference to the following embodiments.

[0073] In some embodiments, please refer to Figure 3 The valve stem 200 is provided with a first limiting part 201 and a second limiting part 202, the valve body 100 is provided with a third limiting part 130 and a fourth limiting part 140, and the water-gas control valve 20 also includes an elastic member 300 for keeping the valve stem 200 in the first position.

[0074] It should be noted that the first limiting part 201 and the second limiting part 202 are located at different positions on the valve stem 200, for example, in Figure 3 In the example shown, the first limiting part 201 is located at a higher position, and the second limiting part 202 is located at a lower position. Here, "high" can be understood as... Figure 3 The coordinate system can be understood as follows, where the Z direction can represent the height direction. Similarly, the third limit part 130 and the fourth limit part are located at different positions on the valve body 100, for example, in... Figure 3In the example shown, the third limiting part 130 is located at a higher position, and the fourth limiting part 140 is located at a lower position.

[0075] It is understandable that the main function of the first limiting part 201, the second limiting part 202, the third limiting part 130, and the fourth limiting part 140 is to limit the extreme positions of the valve stem 200, thereby limiting the movement stroke of the valve stem 200 on the one hand, and preventing the valve stem 200 from exceeding the predetermined movement stroke on the other hand. The aforementioned first position and second position are the two extreme positions of the valve stem 200.

[0076] As described above, the elastic element 300 can be connected between the valve body 100 and the valve stem 200. For example, the elastic element 300 can be connected between the valve body 100 and the valve stem 200 in a compressed state. The elastic restoring force of the elastic element 300 can drive the valve stem 200 to have a tendency to move relative to the valve body 100. Under this tendency, the valve stem 200 can remain in the first position.

[0077] When the valve stem 200 is in the first position, the first limiting part 201 abuts against the third limiting part 130, and when the valve stem 200 is in the second position, the second limiting part 202 abuts against the fourth limiting part 140.

[0078] As mentioned above, a segmented design for the valve body 100 simplifies its manufacturing process. Specifically, because the third limiting part 130 needs to abut against the first limiting part 201, and the fourth limiting part 140 needs to abut against the second limiting part 202, both the third limiting part 130 and the fourth limiting part 140 need to protrude from the inner wall of the valve body 100, which poses a challenge to the molding process. With a segmented design, the third limiting part 130 can be formed on one component of the valve body 100, for example, on the first valve body 110, and the fourth limiting part 140 can be formed on another component of the valve body 100, for example, on the second valve body 120. This allows for the separate molding of the third limiting part 130 and the fourth limiting part 140, thus simplifying the manufacturing process of the valve body 100.

[0079] In some embodiments, please refer to Figure 3 The second limiting part 202 is a first inclined surface 2021 formed on the valve stem 200. The first inclined surface 2021 can be a stepped surface. The fourth limiting part 140 is a second inclined surface 141 formed on the valve body 100. The second inclined surface 141 can also be a stepped surface.

[0080] It is understandable that when the valve stem 200 switches from the first position to the second position, the first inclined surface 2021 will come into contact with the second inclined surface 141, which can alleviate the impact between the valve stem 200 and the valve body 100, reduce vibration, and prevent damage to the valve stem 200 and the valve body 100.

[0081] In some embodiments, please refer to Figure 3 The first limiting part 201 is a first flange 2011 formed on the valve stem 200, and the second limiting part 202 is a second flange 131 formed on the valve body 100. The first flange 2011 and the second flange 131 have sufficient stability when they abut, and the first flange 2011 and the second flange 131 are easier to manufacture.

[0082] Figure 4 A schematic diagram of the structure of a water-gas control valve 20 provided according to an embodiment of this application is shown.

[0083] In some embodiments, please refer to Figure 3 and Figure 4 The air outlet 103, air inlet 102, water outlet 105, and water inlet 104 are arranged sequentially from top to bottom. When the valve stem 200 is in the first position, the air outlet 103 and air inlet 102 are located between the first sealing ring 240 and the second sealing ring 250, the water outlet 105 is located between the second sealing ring 250 and the third sealing ring 260, and the water inlet 104 is located below the third sealing ring 260. When the valve stem 200 is in the second position, the air outlet 103 and air inlet 102 are blocked by the third limiting part 130 and the fourth limiting part 140, and the water outlet 105 and water inlet 104 are located between the second sealing ring 250 and the third sealing ring 260.

[0084] The first sealing ring 240, the second sealing ring 250 and the third sealing ring 260 mentioned above are components that are spaced apart on the valve stem 200. Please refer to the following embodiments concerning the valve stem 200.

[0085] The arrangement of the above-mentioned air outlet 103, air inlet 102, water outlet 105 and water inlet 104, and their relationship with the first sealing ring 240, the second sealing ring 250 and the third sealing ring 260, can form a structure with the air passage above and the water passage below, which can further prevent air or liquid leakage.

[0086] Specifically, when the valve stem 200 is in the first position, the outlet 103 and the inlet 102 are connected and form an air passage. This air passage is located between the first sealing ring 240 and the second sealing ring 250. When gas enters the valve body 100 from the inlet 102, the gas is located between the first sealing ring 240 and the second sealing ring 250, allowing the gas to be discharged from the outlet 103. On the other hand, since the inlet 102 is located below the outlet 103, combined with the rising characteristic of gas, the gas can move upwards and eventually be discharged from the outlet 103.

[0087] As can be seen from the following embodiments, a vent sealing ring 270 is also provided on the valve stem 200. The vent sealing ring 270 is located between the first sealing ring 240 and the second sealing ring 250. During the process of gas being introduced and the gas moving from bottom to top, the gas can break open the vent sealing ring 270, thereby further preventing gas leakage.

[0088] Furthermore, when it is not necessary to introduce gas into the endoscope body 3000, as can be seen from the following embodiments, a pressure relief channel 226 is also provided on the valve stem 200. This pressure relief channel 226 can be specifically provided on the second valve stem section 220 of the valve stem 200. After opening the pressure relief channel 226, gas can be discharged from the water-gas control valve 20 through the pressure relief channel 226. The opening and closing of the pressure relief channel 226 can be achieved by the plug assembly 280 provided on the valve stem 200.

[0089] Furthermore, when the valve stem 200 is in the first position, the inlet 104 and the outlet 105 are separated by the third sealing ring 260, thus disconnecting the water passage.

[0090] When the valve stem 200 is in the second position, the air outlet 103 and the air inlet 102 are blocked by the third limiting part 130 and the fourth limiting part 140. At this time, the water inlet 104 and the water outlet 105 formed on the valve body 100 are both located between the second sealing ring 250 and the third sealing ring 260. The water inlet 104 and the water outlet 105 are connected to form a water passage. During the process of water entering, the second sealing ring 250 and the third sealing ring 260 can prevent water leakage.

[0091] Figure 5 A schematic diagram of a valve stem 200 according to an embodiment of this application is shown; Figure 6 An exploded schematic diagram of a valve stem 200 provided according to an embodiment of this application is shown.

[0092] In the embodiments of this application, please refer to Figure 3 , Figure 5 and Figure 6The valve stem 200 includes a first valve stem section 210, a second valve stem section 220, and a third valve stem section 230.

[0093] A first sealing ring 240 is fitted on the first valve stem section 210. A second valve stem section 220 is detachably connected to the first valve stem section 210 and is fitted with a second sealing ring 250. A third valve stem section 230 is detachably connected to the second valve stem section 220 and is fitted with a third sealing ring 260.

[0094] It is understandable that the length of the first valve stem section 210 is less than the overall length of the valve stem 200. The first sealing ring 240 can be fitted onto the first valve stem section 210 from the end of the first valve stem section 210. For example, the first sealing ring 240 can be fitted onto the end of the first valve stem section 210, thereby reducing damage to the first sealing ring 240.

[0095] For the second valve stem section 220, its length is less than the overall length of the valve stem 200. The second sealing ring 250 can be fitted onto the second valve stem section 220 from the end of the second valve stem section 220, thereby reducing damage to the first sealing ring 240.

[0096] For the third valve stem section 230, its length is less than the overall length of the valve stem 200. The third sealing ring 260 can be fitted onto the third valve stem section 230 from the end of the third valve stem section 230, thereby reducing damage to the third sealing ring 260.

[0097] The first sealing ring 240, the second sealing ring 250 and the third sealing ring 260 are arranged at intervals along the axial direction of the valve stem 200. The combination of the three can achieve a seal between the valve stem 200 and the valve body 100.

[0098] In this embodiment, the valve stem 200 is designed in segments, consisting of a first valve stem segment 210, a second valve stem segment 220, and a third valve stem segment 230. During the overall assembly of the valve stem 200, the first sealing ring 240, the second sealing ring 250, and the third sealing ring 260 can be first assembled onto the first valve stem segment 210, the second valve stem segment 220, and the third valve stem segment 230, respectively. Then, the connection of the first valve stem segment 210, the second valve stem segment 220, and the third valve stem segment 230 is completed. Throughout the assembly process of the valve stem 200, the tension or friction experienced by each sealing ring can be significantly reduced, thereby minimizing damage to each sealing ring. This results in better sealing performance between the valve body 100 and the valve stem 200, preventing liquid or gas leakage.

[0099] As described above, the first limiting part 201 can be formed on the first valve stem section 210, the first sealing ring 240 can be located at the end of the first valve stem section 210, and the first limiting part 201 is located above the first sealing ring 240.

[0100] To achieve the assembly of the first sealing ring 240, a first groove can be provided on the first valve stem section 210, and the first sealing ring 240 can be embedded in the first groove.

[0101] Similarly, a second groove can be provided on the second valve stem section 220, and the second sealing ring 250 can be embedded in the second groove.

[0102] Furthermore, the aforementioned second limiting portion 202 may be formed on the second valve stem section 220, and the second limiting portion 202 is located above the second sealing ring 250.

[0103] Similarly, a third groove can be provided on the third valve stem section 230, and the third sealing ring 260 can be embedded in the third groove.

[0104] In some embodiments, the first valve stem segment 210 and the second valve stem segment 220 may be connected by at least one of butt joint or plug joint; the second valve stem segment 220 and the third valve stem segment 230 may be connected by at least one of butt joint or plug joint.

[0105] It should be noted that butt joint refers to the connection between two components using their end faces, such as two end faces fitting together, while plug joint refers to one component being able to be inserted into the other. Taking the first valve stem segment 210 and the second valve stem segment 220 as examples, a strong adhesive can be applied to the end faces of the first valve stem segment 210 and the second valve stem segment 220 to achieve butt joint, or they can be butt jointed by welding. When plug joint is required, a slot or similar structure can be added to the first valve stem segment 210 so that the second valve stem segment 220 can be inserted into the first valve stem segment 210.

[0106] In some embodiments, please refer to Figure 3 , Figure 5 and Figure 6 The second valve stem section 220 includes a first end 221 and a second end 222. The first end 221 is inserted into the first valve stem section 210, and the second end 222 is inserted into the third valve stem section 230.

[0107] By inserting the two ends of the second valve stem section 220 into the first valve stem section 210 and the third valve stem section 230 respectively, the overall structural strength of the valve stem 200 along the axial direction can be guaranteed.

[0108] In some embodiments, please refer to Figure 3 , Figure 5 and Figure 6 The first valve stem section 210 includes a first insertion channel 211, and a first end 221 is inserted into the first insertion channel 211. The third valve stem section 230 includes a second insertion channel 231, and a second end 222 is inserted into the second insertion channel 231.

[0109] Therefore, both the first valve stem section 210 and the third valve stem section 230 can be designed as hollow cylindrical structures, which can simplify the manufacturing of the first valve stem section 210 and the third valve stem section 230.

[0110] In some specific embodiments, the second valve stem section 220 includes a first section 223, a second section 224, and an intermediate section 225 connecting the first section 223 and the second section 224. The end of the first section 223 forms a first end 221, and the end of the second section 224 forms a second end 222. The first section 223 is threaded into the first insertion channel 211, and the second section 224 is threaded into the second insertion channel 231.

[0111] The use of threaded connections simplifies the overall assembly of the valve stem 200 and improves the connection strength between different parts of the valve stem 200.

[0112] In some embodiments, please refer to Figure 3 , Figure 5 and Figure 6 The first sealing ring 240 is disposed at the end of the first valve stem section 210, the second sealing ring 250 is disposed on the second section 224 of the second valve stem section 220, the outer diameter of the second section 224 gradually decreases in the direction away from the first end 221, and the third sealing ring 260 is disposed at the end of the third valve stem section 230.

[0113] Understandably, since both the first sealing ring 240 and the third sealing ring 260 are located at the ends of their respective valve stem segments 200, their assembly is simplified, reducing damage to these components. Similarly, for the second sealing ring 250, because the outer diameter of the second segment 224 gradually decreases away from the first end 221, it is easy to assemble into the designated position even if the second sealing ring 250 is not located at the end of the second valve stem segment 220. This avoids friction between the second sealing ring 250 and the second valve stem segment 220, further reducing damage to the second sealing ring 250.

[0114] In some embodiments, please refer to Figure 3 , Figure 5 and Figure 6The second valve stem section 220 has a pressure relief channel 226 inside. The pressure relief channel 226 includes a pressure relief inlet 2261 and a pressure relief outlet 2262. The pressure relief inlet 2261 is located between the first seal and the second sealing ring 250, and the pressure relief outlet 2262 is located at the first end 221.

[0115] As described above, when the valve stem 200 is in the first position and gas is not required, the plug assembly 280 at the first end 221 can be opened, thereby opening the pressure relief channel 226. At this time, gas can be discharged from the water-gas control valve 20 along the pressure relief channel 226. When gas needs to be introduced, the plug assembly 280 can be plugged into the first end 221 of the second valve stem section 220.

[0116] The plug assembly 280 can be made of an elastic material, such as silicone or rubber.

[0117] In some embodiments, please refer to Figure 3 , Figure 5 and Figure 6 The valve stem 200 also includes a guide 290, which is sleeved on the second valve stem section 220 and is located near the first sealing ring 240 or the second sealing ring 250.

[0118] The guide member 290 serves to guide the valve stem 200 to move within the valve body 100 and to support the valve stem 200, thereby preventing the valve stem 200 from swaying during movement and improving the stability of the valve stem 200's movement.

[0119] In this embodiment, the guide member 290 can be mechanically connected to the valve stem 200. The guide member 290 can be located at both ends of the middle section 225, so that the guide member 290 can be close to the first sealing ring 240 and the second sealing ring 250.

[0120] In some specific embodiments, the guide member 290 may be made of materials such as plastic, and the surface of the guide member 290 facing the valve body 100 may be made smooth by surface treatment process.

[0121] In some embodiments, please refer to Figure 3 , Figure 5 and Figure 6 A first limiting part 201 is provided on the first valve stem section 210, and a second limiting part 202 is provided on the second valve stem section 220. The first limiting part 201 is used to abut against the third limiting part 130 on the valve body 100, and the second limiting part 202 is used to abut against the fourth limiting part 140 on the valve body 100.

[0122] The configuration and function of the first limiting part 201, the second limiting part 202, the third limiting part 130 and the fourth limiting part 140 can be referred to the above embodiments, and will not be repeated here.

[0123] In some embodiments, please refer to Figure 3 , Figure 5 and Figure 6 The valve stem 200 also includes a vent sealing ring 270, which is sleeved on the second valve stem section 220 and is located between the first sealing ring 240 and the second sealing ring 250. The vent sealing ring 270 includes a vent inclined wall 271 that is inclined in the axial direction.

[0124] As can be seen from the previous embodiments, the function of the vent sealing ring 270 is to form a certain obstruction to the gas. Only after the gas breaks through the vent sealing ring 270 can the gas enter the outlet 103, thereby further preventing the occurrence of gas leakage.

[0125] To facilitate the opening of the vent seal 270 by gas, the vent seal 270 includes a vent inclined wall 271 inclined to the axial direction. The vent inclined wall 271 allows gas to impact the vent seal 270 with a larger effective area, reducing the obstruction of the vent seal 270 to the gas and ensuring that the gas can open the vent seal 270 under normal conditions. On the other hand, the vent inclined wall 271 can also be used in conjunction with the aforementioned embodiment that uses the first inclined surface 2021 as the second limiting part 202 and the second inclined surface 141 as the fourth limiting part, so that when the valve stem 200 is in the second position, the vent inclined wall 271 can further enhance the effect of the second limiting part 202 and the fourth limiting part 140 in blocking the gas passage.

[0126] To enable the installation of the vent seal ring 270, a fourth groove can be provided on the second valve stem section 220, and the vent seal ring 270 can be nested in the fourth groove.

[0127] In the description of this application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application.

[0128] In the description of this application, it should be understood that the terms "comprising" and "having" and any variations thereof used in the embodiments of this application are intended to cover non-exclusive inclusion. For example, a process, method, system, product, or device that includes a series of steps or units is not necessarily limited to those steps or units that are explicitly listed, but may include other steps or units that are not explicitly listed or that are inherent to such process, method, product, or device.

[0129] Unless otherwise expressly specified and limited, the terms "installation," "connection," "linking," "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the connection within two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances. Furthermore, the terms "first," "second," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated.

[0130] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this application, and are not intended to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this application.

Claims

1. A valve stem, characterized in that, include: A first valve stem section, on which a first sealing ring is fitted; The second valve stem section is detachably connected to the first valve stem section, and a second sealing ring is fitted on the second valve stem section; The valve stem section is detachably connected to the second valve stem section and a third sealing ring is fitted on the third valve stem section. The first sealing ring, the second sealing ring and the third sealing ring are spaced apart along the axial direction of the valve stem.

2. The valve stem according to claim 1, characterized in that, The first valve stem segment and the second valve stem segment can be connected by at least one of butt joint or plug joint; the second valve stem segment and the third valve stem segment can be connected by at least one of butt joint or plug joint.

3. The valve stem according to claim 2, characterized in that, The second valve stem section includes a first end and a second end, the first end being inserted into the first valve stem section and the second end being inserted into the third valve stem section.

4. The valve stem according to claim 3, characterized in that, The first valve stem segment includes a first insertion channel, and the first end is inserted into the first insertion channel. The third valve stem segment includes a second insertion channel, and the second end is inserted into the second insertion channel.

5. The valve stem according to claim 4, characterized in that, The second valve stem section includes a first section, a second section, and an intermediate section connected between the first section and the second section. The end of the first section forms the first end, and the end of the second section forms the second end. The first section is threadedly connected to the first insertion channel, and the second section is threadedly connected to the second insertion channel.

6. The valve stem according to claim 5, characterized in that, The first sealing ring is disposed at the end of the first valve stem segment, the second sealing ring is disposed on the second segment of the second valve stem segment, the outer diameter of the second segment gradually decreases in the direction away from the first end, and the third sealing ring is disposed at the end of the third valve stem segment.

7. The valve stem according to claim 3, characterized in that, The second valve stem section has a pressure relief channel inside, which includes a pressure relief inlet and a pressure relief outlet. The pressure relief inlet is located between the first seal and the second sealing ring, and the pressure relief outlet is located at the first end.

8. The valve stem according to any one of claims 1 to 7, characterized in that, The valve stem further includes a guide member, which is sleeved on the second valve stem section and is positioned close to the first sealing ring or the second sealing ring.

9. The valve stem according to any one of claims 1 to 7, characterized in that, The first valve stem section is provided with a first limiting part, and the second valve stem section is provided with a second limiting part. The first limiting part is used to abut against the third limiting part on the valve body, and the second limiting part is used to abut against the fourth limiting part on the valve body.

10. The valve stem according to any one of claims 1 to 7, characterized in that, The valve stem also includes a venting sealing ring, which is sleeved on the second valve stem section and disposed between the first sealing ring and the second sealing ring. The venting sealing ring includes a venting inclined wall that is inclined to the axial direction.

11. A water-gas control valve, characterized in that, include: The valve body has a moving channel and an air inlet, an air outlet, a water inlet, and a water outlet communicating with the moving channel; And the valve stem according to any one of claims 1 to 10, wherein the valve stem is movably disposed within the moving channel, and the valve stem has at least a first position on its moving path that connects the air inlet and the air outlet and disconnects the water inlet and the water outlet, and a second position that disconnects the air inlet and the air outlet and connects the water inlet and the water outlet.

12. The water-gas control valve according to claim 11, characterized in that, The valve stem is provided with a first limiting part and a second limiting part, the valve body is provided with a third limiting part and a fourth limiting part, and the water-gas control valve further includes an elastic element for keeping the valve stem in the first position. When the valve stem is in the first position, the first limiting part abuts against the third limiting part, and when the valve stem is in the second position, the second limiting part abuts against the fourth limiting part.

13. The water-gas control valve according to claim 12, characterized in that, The air outlet, air inlet, water outlet, and water inlet are arranged sequentially from top to bottom. When the valve stem is in the first position, the air outlet and air inlet are located between the first sealing ring and the second sealing ring, the water outlet is located between the second sealing ring and the third sealing ring, and the water inlet is located below the third sealing ring. When the valve stem is in the second position, the air outlet and air inlet are blocked by the third limiting part and the fourth limiting part, and the water outlet and water inlet are located between the second sealing ring and the third sealing ring.

14. An endoscope operating unit, characterized in that, Includes the water-gas control valve according to any one of claims 11 to 13.

15. An endoscope, characterized in that, Includes the endoscope operating unit as described in claim 14.

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