One-way air intake valve

Abstract

The utility model relates to a one -way air inlet valve, including upper valve body, valve core subassembly and lower valve body, upper valve body is connected with lower valve body thread, still be equipped with air inlet and sealed cavity on lower valve body, air inlet and sealed cavity intercommunication, the caliber of air inlet is smaller than sealed cavity, the top surface of lower valve body is equipped with annular clamping groove, valve core subassembly includes valve core seat, spring and valve core, and valve core seat integrative includes through -hole, spring seat and plug hiding cavity. Its through spring's elasticity realizes the close cooperation of plug, sealing washer and sealed cavity, effectively prevents the gas counterflow under normality. When gas pressure exceeds spring elasticity, the plug is pressed into the plug hiding cavity, avoids the sealing washer responsible for the airtightness direct contact high pressure gas, makes the sealing washer have longer service life, and the gas is discharged from the valve core exhaust hole first, and then reaches the valve body cavity, and finally is discharged from the valve body exhaust port, realizes the function of one -way air inlet.

Description

Technical Field

[0001] This utility model relates to a one-way air intake valve. Background Technology

[0002] A one-way intake valve, also known as a check valve, is a key component widely used in fluid piping systems (such as air compressors, internal combustion engine intake systems, vacuum equipment, and medical respiratory devices). Its core function is to allow fluid (usually gas) to flow in one direction and effectively prevent backflow, thereby ensuring the stability, efficiency, and safety of the system.

[0003] According to Chinese Patent No. CN 220930275 U, a one-way inflation valve for an inflatable life-saving device relies on a spring pressed between the one-way valve core and the spring seat. Under the spring's reaction force, the sealing gasket on the one-way valve core presses against the pipe connector, sealing the life raft. Traditional one-way valves typically use sealing gaskets made of flexible, airtight materials like rubber. While these meet basic sealing requirements, when the valve core is exposed to high-pressure gases (such as carbon dioxide or nitrogen), the sealing gasket directly withstands the gas impact and is easily torn apart. This significantly shortens the valve core's lifespan, requiring frequent replacement of consumables like the sealing gasket, thus consuming more manpower and resources.

[0004] Therefore, a new one-way intake valve solution is needed that can ensure excellent sealing performance while having the advantages of high pressure resistance and long service life, in order to overcome the above-mentioned defects of the existing technology. Utility Model Content

[0005] The purpose of this invention is to provide a one-way air intake valve to address the shortcomings of the aforementioned background technology.

[0006] To achieve the above objectives, this utility model designs a one-way air intake valve, comprising an upper valve body, a valve core assembly, and a lower valve body. The upper and lower valve bodies are threadedly connected. The lower valve body also has an air inlet and a sealing cavity, which are connected. The diameter of the air inlet is smaller than that of the sealing cavity. The top surface of the lower valve body has an annular groove. The valve core assembly includes a valve core seat, a spring, and a valve core. The outer side of the valve core seat has a valve core thread. The top of the inner wall of the upper valve body has a through-hole thread that mates with the valve core thread. The valve core seat is fixed to the upper valve body by the engagement of the valve core thread and the through-hole thread. The valve core seat is an integral structure, including a through-hole, a spring seat, and a plug-in cavity. The outer diameter of the bottom surface of the valve core seat mates with the annular groove. After the valve body is assembled, the bottom of the valve core seat is inserted into the annular groove, thereby preventing gas backflow. A valve core vent hole is provided above the bottom of the valve core seat. The valve core consists of a valve stem and a plug. The spring is sleeved around the valve stem, with one end pressing against the spring seat and the other end pressing against the top of the plug. The plug has a groove in the upper part, and a valve core sealing ring is installed in the groove. The sealing cavity and the plug fit together to accommodate the plug, allowing the plug to move longitudinally within the sealing cavity. The valve core sealing ring is interference-fitted with the inner wall of the sealing cavity. The diameter of the through hole matches the valve stem, allowing the valve stem to move freely within the through hole. Under normal conditions, the spring uses its own elastic force to push the plug into the sealing cavity, with the bottom surface of the plug pressing against the bottom annular surface of the sealing cavity. The diameter of the plug concealment cavity is the same as that of the sealing cavity, which can accommodate the plug. When the gas pressure exceeds the spring force, the plug is pressed into the plug concealment cavity, and the gas is discharged from the valve core vent hole.

[0007] A further option is to integrally incorporate a longitudinal hexagonal prism on the outer surface of the valve core seat, allowing it to be easily screwed into the through-hole thread during assembly via a screwing operation.

[0008] A further option is to provide a valve body exhaust port at the top of the upper valve body. After the gas is discharged from the valve core exhaust hole, it reaches the valve body cavity formed by the inner wall of the upper valve body, the upper surface of the lower valve body, and the outer wall of the valve core assembly, and finally is discharged from the valve body exhaust port.

[0009] A further improvement is that the upper valve body, which is designed to be airtight, has a sealing groove at the connection with the lower valve body. Correspondingly, the lower valve body is fitted with a valve body sealing ring. When the upper and lower valve bodies are combined, the valve body sealing ring and the sealing groove are interference-fitted, ensuring the airtightness of the valve body.

[0010] A further proposed solution is to have external threads on the outer surface of the upper valve body, which serve to connect to the intake system.

[0011] A further solution is to have internal threads on the inner wall of the lower valve body at the bottom, which are used to connect to the air outlet system.

[0012] A further improvement is that the valve core sealing ring and the valve body sealing ring described in this utility model are made of fluororubber material.

[0013] This invention discloses a one-way air intake valve that uses the spring force to achieve a tight fit between the plug, sealing ring, and sealing cavity, effectively preventing gas backflow under normal conditions. When the gas pressure exceeds the spring force, the plug is pressed into the plug concealment cavity, preventing the sealing ring responsible for airtightness from directly contacting the high-pressure gas, thus extending the sealing ring's service life. The gas first exits from the valve core exhaust port, then reaches the valve body cavity, and finally exits from the valve body exhaust port, achieving the one-way air intake function. Attached Figure Description

[0014] Figure 1 This is a half-section exploded view of this utility model. Figure 2 This is a cross-sectional schematic diagram of the present invention in its general state. Figure 3 This is a cross-sectional schematic diagram of the present invention in its working state. Figure 4 This is a schematic diagram of the airflow direction under the working condition of this utility model. Figure 5 This is a schematic diagram of the valve core seat described in this utility model. Figure 6 This is a bottom view of the valve core seat described in this utility model. Figure 7 This is a top view of the valve core seat described in this utility model. Explanation of reference numerals in the attached drawings: Upper valve body 1, through hole thread 11, upper valve body internal thread 12, valve body cavity 13, valve body exhaust port 14, sealing groove 15, upper valve body external thread 16, valve core assembly 2, valve core seat 21, valve core thread 211, spring seat 212, plug concealment cavity 213, through hole 214, valve core exhaust hole 215, valve core seat outer wall section a 216, valve core seat outer wall section b 217, spring 22, valve core 23, valve stem 231, plug 232, valve core sealing ring 233, lower valve body 3, lower valve body external thread 31, lower valve body internal thread 32, air inlet 33, sealing cavity 34, annular groove 35, valve body sealing ring 36. Detailed Implementation

[0015] The preferred embodiments of the present invention will be described below with reference to the accompanying drawings. It should be understood that the preferred embodiments described herein are for illustration and explanation only and are not intended to limit the present invention.

[0016] Example 1.

[0017] This embodiment describes a one-way intake valve; please refer to [reference needed]. Figure 1 , Figure 2 , Figure 3 and Figure 4 The system includes an upper valve body 1, a valve core assembly 2, and a lower valve body 3. The upper valve body 1 integrally includes an internal thread 12, and the lower valve body 3 integrally includes an external thread 31. The upper valve body 1 and the lower valve body 3 are threaded together by the engagement of the internal thread 12 and the external thread 31. To ensure airtightness between the valve bodies, the upper valve body 1 has a sealing groove 15 at the connection with the lower valve body 3. Correspondingly, the lower valve body 3 is fitted with a valve body sealing ring 36 made of fluororubber. When the upper valve body 1 and the lower valve body 3 are combined, the valve body sealing ring 36 is press-fitted with the sealing groove 15. The lower valve body 3 has an air inlet 33 and a sealing cavity 34, which are interconnected, and the diameter of the air inlet 33 is smaller than that of the sealing cavity 34. The top surface of the lower valve body 3 has an annular groove 35. In addition, the inner wall of the bottom of the lower valve body 3 has an internal thread 32 for connecting to the air outlet system. The outer surface of the upper valve body 1 is provided with an external thread 16 for fixing the one-way intake valve to the intake system. The top of the upper valve body 1 is also provided with a valve body exhaust port 14. The valve body cavity 13 is formed by the inner wall of the upper valve body 1, the upper surface of the lower valve body 3 and the outer wall of the valve core assembly 2, and the gas is finally discharged from the valve body exhaust port 14.

[0018] Please refer to Figure 1 and Figure 2 The valve core assembly 2 is the core functional unit, including a valve core seat 21, a spring 22, and a valve core 23. The valve core seat 21 is fixed to the upper valve body 1 by engaging with the through hole thread 11 on the top of the inner wall of the upper valve body 1 through the valve core thread 211 on its outer side.

[0019] Please refer to Figure 2 , Figure 5 , Figure 6 and Figure 7 For ease of assembly, the valve core seat 21 integrally includes a hexagonal cross-section valve core seat outer wall section a 216 for easy tool turning, specifically a longitudinal hexagonal prism structure, with a circular cross-section valve core seat outer wall section b 217 integrally formed below it. The integral structure of the valve core seat 21 also includes an upper through hole 214, a middle spring seat 212, and a lower plug concealment cavity 213. The outer diameter of the bottom of the valve core seat 21 mates with the annular groove 35 of the lower valve body 3. After the valve body is assembled, the bottom of the valve core seat 21 is inserted into the annular groove 35 to prevent gas backflow. The valve core seat outer wall section b 217 is provided with a valve core vent hole 215.

[0020] Please refer to Figure 1 and Figure 2The valve core 23 is an integral structure, including a valve stem 231 and a plug 232. The spring 22 is sleeved around the valve stem 231, with one end abutting against the spring seat 212 and the other end abutting against the top of the plug 232. The upper part of the plug 232 has a groove, in which a valve core sealing ring 233 is embedded. The valve core sealing ring 233 is made of fluororubber material.

[0021] Please refer to Figure 2 , Figure 3 and Figure 4 The sealing cavity 34 mates with the plug 232, accommodating the plug 232 and allowing it to move longitudinally. The valve core sealing ring 233 is interference-fitted with the inner wall of the sealing cavity 34. The diameter of the through hole 214 matches the valve stem 231, ensuring that the valve stem 231 can move freely within it. The diameter of the plug concealment cavity 213 is the same as that of the sealing cavity 34, used to accommodate the plug 232. Under normal conditions, the spring 22 uses its own elastic force to push the plug 232 into the sealing cavity 34, so that the bottom surface of the plug 232 is tightly against the bottom annular surface of the sealing cavity 34, and the valve core sealing ring 233 ensures a seal, thereby effectively preventing gas backflow. When the gas pressure exceeds the spring force, the plug 232 is pressed into the plug concealment cavity 213. This design avoids the valve core sealing ring 233 directly bearing the impact of high-pressure gas, extending its service life. Subsequently, the gas enters the valve body cavity 13 through the valve core exhaust hole 215 and is finally discharged from the valve body exhaust port 14, realizing the one-way air intake function.

[0022] Finally, it should be noted that the above description is merely a preferred embodiment of this utility model and is not intended to limit the utility model. Although the utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. A one-way intake valve, comprising an upper valve body (1), a valve core assembly (2), and a lower valve body (3), wherein the upper valve body (1) and the lower valve body (3) are threadedly connected, characterized in that, The lower valve body (3) is provided with an air inlet (33) and a sealing cavity (34), which are connected. The diameter of the air inlet (33) is smaller than that of the sealing cavity (34). The top surface of the lower valve body (3) is provided with an annular groove (35). The valve core assembly includes a valve core seat (21), a spring (22), and a valve core (23). The valve core seat (21) is provided with a valve core thread (211) on its outer side. The top of the inner wall of the upper valve body (1) is provided with a through hole thread (11) that mates with the valve core thread (211). The valve core seat (21) is connected to the valve core thread (211). The valve core is fixed to the upper valve body (1) by the engagement of the valve core thread (211) and the through hole thread (11). The valve core seat (21) is an integral structure, including a through hole (214), a spring seat (212), and a plug concealment cavity (213). The outer diameter of the bottom surface of the valve core seat (21) engages with the annular groove (35). After the valve body is assembled, the bottom of the valve core seat (21) is inserted into the annular groove (35). A valve core vent hole (215) is provided above the bottom of the valve core seat (21). The valve core (23) integrally includes the valve stem (231) and the plug (232). The spring (22) is sleeved around the valve stem (231), with one end abutting against the spring seat (212) and the other end abutting against the top of the plug (232). The plug (232) has a groove in the upper part, and a valve core sealing ring (233) is provided in the groove. The sealing cavity (34) and the plug (232) are fitted together to accommodate the plug (232), allowing the plug (232) to move longitudinally within the sealing cavity (34). The valve core sealing ring (233) is press-fitted with the inner wall of the sealing cavity (34). The diameter of the through hole (214) is the same as that of the valve stem (231). 231) The valve stem (231) can move freely in the through hole (214). Under normal conditions, the spring (22) pushes the plug (232) into the sealing cavity (34) with its own elastic force. The bottom surface of the plug (232) presses against the bottom annular surface of the sealing cavity (34). The diameter of the plug concealment cavity (213) is the same as that of the sealing cavity (34) and can accommodate the plug (232). When the gas pressure exceeds the elastic force of the spring (22), the plug (232) is pressed into the plug concealment cavity (213) and the gas is discharged from the valve core exhaust hole (215).

2. A one-way intake valve according to claim 1, characterized in that, The outer surface of the valve core seat (21) integrally includes a longitudinal hexagonal prism.

3. A one-way intake valve according to claim 1, characterized in that, The upper valve body (1) is also provided with a valve body exhaust port (14) at the top. The inner wall of the upper valve body (1), the upper surface of the lower valve body (3) and the outer wall of the valve core assembly form a valve body cavity (13).

4. A one-way intake valve according to claim 1, characterized in that, The upper valve body (1) has a sealing groove (15) at the connection with the lower valve body (3). Correspondingly, the lower valve body is fitted with a valve body sealing ring (36). When the upper valve body (1) and the lower valve body (3) are combined, the valve body sealing ring (36) and the sealing groove (15) are press-fitted.

5. A one-way intake valve according to claim 1, characterized in that, The outer surface of the upper valve body (1) is provided with an external thread (16).

6. A one-way intake valve according to claim 1, characterized in that, The inner wall at the bottom of the lower valve body (3) is provided with a lower valve body internal thread (32).

7. A one-way intake valve according to claim 1, characterized in that, The valve core sealing ring (233) and the valve body sealing ring (36) are made of fluororubber material.

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