A new air pressure reducing valve

Abstract

The utility model relates to a novel air pressure reducing valve belongs to pressure reducing valve technical field. The pressure reducing valve includes valve body, the valve body includes valve cover and lower valve body, and the lower valve body is opened gas flow cavity, and is opened vertical valve cavity along the vertical center with gas flow cavity intercommunication, and is provided with the valve core subassembly and separates gas flow cavity, and the valve core subassembly top is connected with valve rod, the valve cover top end assembly fixed valve cover, the vertical valve cavity top sliding connection has the piston, the valve core subassembly valve rod top end and the bottom surface center of piston abut, the center of piston is opened overflow hole, and the valve cavity of valve cover is provided with double -deck spring coaxially, and double -deck spring bottom end is connected with the piston, and top end connection has spring seat, and the lateral wall of valve cover is opened and penetrates the pressure relief hole. The utility model discloses the pressure reducing valve in the design is provided with double -deck spring, can realize the fine adjustment to piston pressure to guarantee the pressure stability of pressure reducing valve outlet, and the use reliability of pressure reducing valve is improved greatly.

Description

Technical Field

[0001] This utility model relates to the field of pressure reducing valve technology, specifically to a novel air pressure reducing valve. Background Technology

[0002] A pressure reducing valve is a valve that reduces the inlet pressure to a desired outlet pressure by adjustment, and automatically maintains a stable outlet pressure by relying on the energy of the medium itself. From a fluid mechanics perspective, a pressure reducing valve is a throttling element with variable local resistance. That is, by changing the throttling area, the flow velocity and kinetic energy of the fluid are altered, resulting in different pressure losses, thereby achieving pressure reduction. Then, through the adjustment of the control and regulation system, the fluctuations in the downstream pressure are balanced with the spring force, keeping the downstream pressure constant within a certain error range.

[0003] For example, patent CN222686982U discloses an air filter pressure reducing valve. This valve achieves gas filtration and improves the service life of the filter by setting a guide plate, guide vanes, and filter screen at the air inlet end of the valve. However, like existing pressure reducing valves, this patent has a feedback air passage at the air outlet end, which generates thrust on the diaphragm assembly. The feedback efficiency of a single feedback air passage is low, resulting in insufficient sensitivity of the pressure reducing valve. Moreover, a single feedback air passage is prone to impact damage to the diaphragm, affecting its service life. Furthermore, when the pressure in the air outlet section increases, the feedback pressure also acts on the top surface of the valve core, causing the valve core to move downward, opening the valve port and forming continuous air intake, which affects the pressure reduction effect in the air outlet section. Summary of the Invention

[0004] To address the problems in the existing technology, this utility model patent designs a new type of air pressure reducing valve to solve the problems of low response and adjustment sensitivity, easy impact on the service life of the diaphragm, and poor pressure reduction effect at the outlet of the existing pressure reducing valve.

[0005] The technical solution adopted in this utility model is as follows: The pressure reducing valve includes a valve body, which includes a valve cover and a lower valve body. A gas flow chamber is opened at the lower part of the lower valve body, and a vertical valve chamber is opened at the upper part along the vertical center, communicating with the gas flow chamber. A valve core assembly is provided in the vertical valve chamber to divide the gas flow chamber into an inlet section and an outlet section. The valve core assembly is slidably connected vertically in the vertical valve chamber, and a return spring is provided at its bottom, connected to the bottom surface of the lower valve body, and a valve stem is connected at its top. The top of the vertical valve chamber of the lower valve body is a piston chamber, in which a piston is slidably connected. The valve core assembly... The top of the rod passes into the piston chamber and abuts against the center of the bottom surface of the piston. An overflow hole is opened at the center of the piston. The gas outlet section of the gas flow chamber is connected to the piston chamber through an exhaust hole. A double-layer spring is coaxially arranged inside the valve cover. The double-layer spring includes an outer large spring and an inner small spring. The bottom end of the double-layer spring is connected to the piston, and the top end is connected to a spring seat. An internal threaded through hole is opened at the center of the valve cover, and an adjusting bolt is threadedly connected thereto. The bottom end of the adjusting bolt abuts against the central concave hole on the top surface of the spring seat. A through pressure relief hole is opened on the side wall of the valve cover.

[0006] Furthermore, the top of the valve core assembly is a sealing disc, and a sealing gasket is provided on the top surface of the sealing disc. The cross-section of the valve core assembly is T-shaped, and the diameter of its top sealing disc is larger than that of the lower part of the valve core assembly.

[0007] Furthermore, a locking nut is threaded onto the adjusting bolt, and the locking nut is located on the outside of the valve cover.

[0008] Furthermore, a valve seat is fixed in the gas flow chamber of the lower valve body by a washer through a hole, dividing the gas flow chamber into an upper outlet and a lower inlet section. A valve port is opened in the center of the valve seat, and the valve stem of the valve core assembly passes through the valve port. The sealing disc of the valve core assembly can completely seal the bottom surface of the valve port of the valve seat.

[0009] Furthermore, the lower valve body has a guide plate fixed to the bottom center of the piston chamber by a washer through a hole. The guide plate has a through guide hole at the center and multiple through vent holes around the guide hole. The top of the valve stem of the valve core assembly passes upward through the guide hole at the center of the guide plate.

[0010] Furthermore, a limiting groove is opened at the bottom center of the lower valve body, and the bottom section of the valve core assembly is slidably connected in the limiting groove. A washer and a small K-type sealing ring are fixed in the limiting groove through a hole to seal the valve core assembly. The bottom end of the reset spring is fixed at the bottom of the limiting groove.

[0011] Furthermore, the valve cover is provided with internally threaded screw holes at the pressure relief holes. There are multiple pressure relief holes, which are symmetrically distributed around the screw holes. An overflow washer and a sealing plate are connected to the screw holes by threaded semi-circular head screws. The sealing plate can completely cover the surrounding pressure relief holes.

[0012] Furthermore, a sealing gasket is provided on the bottom surface of the overflow hole at the center of the piston. After the top surface of the valve stem abuts against the bottom surface of the piston, the bottom opening of the overflow hole can be completely sealed.

[0013] Furthermore, the piston has a circumferential groove on its outer periphery, and a large K-shaped sealing ring is embedded in the groove.

[0014] Furthermore, the valve core assembly and the valve stem have interconnecting cavities inside, the cavity inside the valve stem has a connecting opening on the middle side of the valve stem, the cavity inside the valve core assembly connects to the bottom end of the valve core assembly, and the return spring is located in the cavity at the bottom of the valve core assembly.

[0015] Compared to existing technologies, the advancements of this novel air pressure reducing valve, as designed in this utility model patent, lie in: The pressure reducing valve of this invention features a double-layer spring within its valve cover. This double-layer spring comprises a large spring and a small spring with different elastic forces. The double-layer spring allows for more precise adjustment of the piston thrust, improving the accuracy of the pressure reducing valve control. A guide plate is installed within the lower valve body of the pressure reducing valve, and the guide plate also has a through-hole. The feedback air pressure from the outlet section can pass through the vent hole into the piston chamber, where it, together with the exhaust hole, sends the feedback air pressure into the piston chamber, generating a feedback thrust on the piston and improving the sensitivity of the pressure reducing valve to overpressure feedback. An enlarged-diameter sealing disc is installed at the top of the valve core assembly of the pressure reducing valve. The air pressure in the intake section can exert an upward thrust on the bottom surface of the sealing disc. A through cavity is provided between the valve stem and the valve core assembly. The bottom end of the valve core assembly forms a piston chamber with the sealing limiting groove. Feedback air pressure can pass through this cavity to the bottom end of the valve core assembly, thus creating air pressure balance on both sides of the valve core assembly after it completely seals the valve port. This prevents the air pressure in the outlet section from pushing the valve core assembly away from the valve seat, affecting the pressure reduction effect. A sealing plate is provided at the pressure relief hole of the valve cover. The sealing plate does not affect the air outlet of the pressure relief hole and also prevents external dust from entering the valve cavity of the valve cover through the pressure relief hole. The pressure reducing valve provided by this utility model patent seals the valve port seat through a horizontally placed valve seat and the valve core assembly located in the intake section below the valve seat. This allows a stable air pressure to be formed in the outlet section when the valve seat and overflow hole are closed. The magnitude of this air pressure can be adjusted by rotating the adjusting bolt. Attached Figure Description

[0016] Figure 1 This is a structural schematic diagram of a new type of air pressure reducing valve.

[0017] In the diagram, 1 is the lower valve body, 3 is the valve cover, 4 is the valve core assembly, 5 is the piston, 6 is the spring seat, 7 is the adjusting bolt, 11 is the guide plate, 12 is the valve seat, 13 is the small K-type sealing ring, 14 is the sealing washer, 15 is the hole retaining ring, 16 is the O-type sealing ring, 17 is the exhaust hole, 18 is the air inlet section, 19 is the air outlet section, 21 is the pressure relief hole, 22 is the semi-circular head screw, 23 is the overflow washer, 24 is the sealing plate, 41 is the valve stem, 42 is the return spring, 51 is the overflow hole, 52 is the large K-type sealing ring, 61 is the large spring, 62 is the small spring, and 71 is the lock nut. Detailed Implementation

[0018] The present invention will be further described below with reference to the accompanying drawings and specific embodiments. The technical solutions in the embodiments of the present invention will be clearly and completely described. The described embodiments are merely some, not all, of the embodiments of the present invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative effort are within the scope of protection of the present invention.

[0019] like Figure 1 As shown, this utility model patent designs an embodiment of a novel air pressure reducing valve. In this embodiment, the pressure reducing valve includes a valve body, which includes a valve cover 3 and a lower valve body 1. The lower part of the lower valve body 1 has a gas flow chamber, and the upper part has a vertical valve chamber along the vertical center, which communicates with the gas flow chamber. The valve cover 3 is assembled and fixed on the upper side of the lower valve body 1, coaxially arranged with the vertical valve chamber of the lower valve body 1, and fixed by a plurality of symmetrically arranged hexagonal screws. The top of the vertical valve chamber of the lower valve body 1 is a piston chamber, and the gas outlet section 19 of the gas flow chamber is connected to the piston chamber through an exhaust port 17.

[0020] A piston 5 is slidably connected inside the piston chamber. A groove is formed along the circumferential periphery of the piston 5, and a large K-shaped sealing ring 52 is embedded in the groove to seal the piston 5 against the side wall of the piston chamber. The top of the valve stem 41 of the valve core assembly 4 penetrates into the piston chamber and abuts against the center of the bottom surface of the piston 5. An overflow hole 51 is formed at the center of the piston 5, and a sealing gasket is provided on the bottom surface of the overflow hole 51. After the top surface of the valve stem 41 abuts against the bottom surface of the piston 5, the bottom opening of the overflow hole 51 can be completely sealed.

[0021] A double-layer spring is coaxially arranged inside the valve cover 3. The double-layer spring consists of an outer large spring 61 and an inner small spring 62. The bottom end of the double-layer spring is connected and fixed to the piston 5, and the top end is connected and fixed to the spring seat 6. An internally threaded through hole is opened at the center of the valve cover 3, and an adjusting bolt 7 is threadedly connected thereto. A circular concave hole is opened in the top surface of the spring seat 6. The bottom end of the adjusting bolt 7 abuts against the concave hole in the center of the top surface of the spring seat 6. Rotating the adjusting bolt 7 downwards can push the spring seat 6 downwards. A locking nut 71 is threadedly connected to the adjusting bolt 7. The locking nut 71 is located on the outside of the valve cover 3. After the adjusting bolt 7 is adjusted into place, rotating the locking nut 71 limits the adjustment bolt 7.

[0022] The lower valve body 1 has a guide plate 11 fixed to the bottom center of its piston chamber by a washer 15 through a hole. The guide plate 11 has a through guide hole at its center and multiple through vent holes around the guide hole. The top end of the valve stem 41 of the valve core assembly 4 passes through the guide hole at the center of the guide plate 11.

[0023] A valve seat 12 is fixed to the gas flow chamber of the lower valve body 1 by a washer 15 through a hole. An O-ring is provided on the bottom side of the valve seat 12 for sealing. The valve seat 12 divides the gas flow chamber into a lower inlet section 18 and an upper outlet section 19. A valve port is opened at the center of the valve seat 12. The valve stem 41 of the valve core assembly 4 passes through the valve port axis of the valve seat 12. The diameter of the valve stem 41 is smaller than that of the valve port. The top of the valve core assembly 4 is a sealing disc. A sealing gasket is provided on the top surface of the sealing disc. The cross-section of the valve core assembly 4 is T-shaped. The diameter of its top sealing disc is larger than that of the lower part of the valve core assembly. The sealing disc of the valve core assembly 4 can completely seal the bottom surface of the valve port of the valve seat 12.

[0024] The valve core assembly 4 and the valve stem 41 have interconnecting cavities inside. The cavity inside the valve stem 41 has a connecting opening on the middle side of the valve stem 41. The cavity inside the valve core assembly 4 connects to the bottom end of the valve core assembly 4. The return spring 42 is located in the cavity at the bottom of the valve core assembly 4. A limiting groove adapted to the bottom section of the valve core assembly 4 is opened at the center of the bottom of the lower valve body 1. The bottom section of the valve core assembly 4 is slidably connected in the limiting groove. A sealing gasket 14 and a small K-type sealing ring 13 are fixed to the top opening of the limiting groove through a hole using a retaining ring 15 to seal between the valve core assembly 4 and the limiting groove. The bottom end of the return spring 42 is fixed to the bottom of the limiting groove.

[0025] Additionally, a through-hole 21 is provided in the middle of the side wall of the valve cover 1. The valve cover 1 has multiple threaded screw holes at the pressure relief hole 21, symmetrically distributed around the screw holes. An overflow washer 23 and a sealing plate 24 are connected to the screw hole via a threaded semi-circular head screw 22. The sealing plate 24 completely covers the surrounding pressure relief holes 21, while allowing gas to pass through without affecting the gas outlet of the pressure relief hole 21.

[0026] When the novel air pressure reducing valve disclosed in this utility model patent is applied, rotating the adjusting bolt 7 downwards compresses the double-layer spring through the spring seat 6. The double-layer spring pushes the piston 5 downwards, thereby pushing the valve core assembly 4 downwards through the valve stem 41. The sealing disc at the top of the valve core assembly 4 leaves the valve port seat 12, and the valve port is opened. The opening degree of the valve port can be adjusted by adjusting the adjusting bolt 7. There is pressure output in the outlet section 19. At the same time, the output air pressure acts on the piston 13 through the exhaust port 17 and the through hole on the guide plate 11, generating an upward thrust. This thrust compresses the double-layer spring, causing the piston 5 and the valve core assembly 4 to move upwards, and the valve port opening degree decreases. When the pressure in the outlet section 19 reaches the set pressure, the feedback thrust on the piston 5 is balanced with the spring force of the double-layer spring. When the pressure in the outlet section 19 exceeds the set pressure, the feedback thrust increases, pushing the piston 5 to continue moving upwards away from the equilibrium position. The valve stem 41 also moves upwards, causing the valve port opening degree to continue to decrease, reducing the pressure in the outlet section 19 until the pressure on both sides is balanced. If the pressure in the outlet section 19 is still greater than the required pressure, the piston 5 continues to move upward until the bottom surface of the piston 5 separates from the top surface of the valve stem 41. The excess compressed air enters the valve chamber of the valve cover 2 through the overflow hole 51 in the center of the piston 5 and is discharged into the atmosphere through the pressure relief hole. The valve ports of the valve core assembly 4 are completely closed. Then, when the pressure in the outlet section 19 drops back to the set pressure, the piston 5 moves down again under the force of the double-layer spring and abuts against the top surface of the valve stem 41, sealing the overflow hole 51 in the center of the piston 5 and keeping the pressure in the outlet section 19 relatively stable. When the pressure in the outlet section 19 drops, the piston 5 continues to move down and pushes the valve stem 41 down to open the valve port until the pressure in the outlet section 19 and the force of the double-layer spring are balanced again.

[0027] The above description is merely a preferred embodiment of the present invention and should not be construed as limiting the scope of the present invention. Any simple equivalent changes and modifications made in accordance with the claims and description of the present invention shall still fall within the scope of the present invention.

Claims

1. A novel air pressure reducing valve, characterized in that, The pressure reducing valve includes a valve body, which comprises a valve cover and a lower valve body. The lower part of the lower valve body has a gas flow chamber, and the upper part has a vertical valve chamber along its vertical center, communicating with the gas flow chamber. A valve core assembly is disposed in the vertical valve chamber, dividing the gas flow chamber into an inlet section and an outlet section. The valve core assembly is slidably connected vertically within the vertical valve chamber, and its bottom is provided with a return spring connected to the bottom surface of the lower valve body, while its top is connected to a valve stem. The top of the vertical valve chamber of the lower valve body is a piston chamber, in which a piston is slidably connected. The top end of the valve stem of the valve core assembly passes through the piston. The valve cover is fitted with a double-layer spring, which consists of an outer large spring and an inner small spring. The bottom of the double-layer spring is connected to the piston, and the top of the double-layer spring is connected to a spring seat. The valve cover has an internal threaded through hole at its center, and an adjusting bolt is threaded to it. The bottom of the adjusting bolt abuts against the central recessed hole on the top surface of the spring seat. The valve cover has a through pressure relief hole on its side wall.

2. The novel air pressure reducing valve according to claim 1, characterized in that, The top of the valve core assembly is a sealing disc, and a sealing gasket is provided on the top surface of the sealing disc. The cross-section of the valve core assembly is T-shaped, and the diameter of its top sealing disc is larger than that of the bottom of the valve core assembly.

3. The novel air pressure reducing valve according to claim 2, characterized in that, The adjusting bolt is threaded with a locking nut, which is located on the outside of the valve cover.

4. A novel air pressure reducing valve according to claim 3, characterized in that, A valve seat is fixed in the gas flow chamber of the lower valve body by a washer through a hole, dividing the gas flow chamber into an upper outlet and a lower inlet section. A valve port is opened in the center of the valve seat, and the valve stem of the valve core assembly passes through the valve port. The sealing disc of the valve core assembly can completely seal the bottom surface of the valve port of the valve seat.

5. A novel air pressure reducing valve according to claim 4, characterized in that, The lower valve body has a guide plate fixed to the bottom center of the piston chamber by a washer through a hole. The guide plate has a through guide hole at the center and multiple through vent holes around the guide hole. The top of the valve stem of the valve core assembly passes upward through the guide hole at the center of the guide plate.

6. A novel air pressure reducing valve according to claim 5, characterized in that, A limiting groove is opened at the bottom center of the lower valve body. The bottom section of the valve core assembly is slidably connected in the limiting groove. A washer and a small K-type sealing ring are fixed in the limiting groove through a hole to seal the valve core assembly. The bottom end of the reset spring is fixed at the bottom of the limiting groove.

7. A novel air pressure reducing valve according to claim 1, characterized in that, The valve cover has internally threaded screw holes at the pressure relief holes. There are multiple pressure relief holes, which are symmetrically distributed around the screw holes. An overflow washer and a sealing plate are connected to the screw holes by a threaded semi-circular head screw. The sealing plate can completely cover the surrounding pressure relief holes.

8. A novel air pressure reducing valve according to claim 1, characterized in that, A sealing gasket is provided on the bottom surface of the overflow hole at the center of the piston. After the top surface of the valve stem abuts against the bottom surface of the piston, the bottom opening of the overflow hole can be completely sealed.

9. A novel air pressure reducing valve according to claim 1, characterized in that, The piston has a circumferential groove on its outer periphery, and a large K-shaped sealing ring is embedded in the groove.

10. A novel air pressure reducing valve according to claim 6, characterized in that, The valve core assembly and valve stem have interconnected cavities inside. The cavity inside the valve stem has a connecting opening on the middle side of the valve stem. The cavity inside the valve core assembly connects to the bottom end of the valve core assembly. The return spring is located in the cavity at the bottom of the valve core assembly.

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