Adjustable opening pressure check valve

Abstract

This invention discloses an adjustable opening pressure check valve, relating to the field of valve technology. The adjustable opening pressure check valve includes a valve body, a positioning plate, a valve core, a pressure regulating structure, and a pressure applying structure. The pressure regulating structure includes a pressure regulating screw and a locking nut. The positioning plate has a first threaded hole and a flow hole. The pressure regulating screw is threaded into the first threaded hole and can be adjusted axially. A pressure regulating part is provided at the end of the pressure regulating screw away from the valve core. The locking nut has a second threaded hole and is threadedly connected to the pressure regulating screw to lock it to the positioning plate. When adjusting, the operator directly rotates the pressure regulating screw through the pressure regulating part. The pressure regulating screw rotates and moves axially, thereby pressing against the pressure applying structure. The compression of the pressure applying structure changes, and the pressure acting on the valve core changes simultaneously. The opening pressure of the check valve increases or decreases accordingly, allowing the check valve to handle different fluids and pressure requirements, thus improving its applicability.

Description

Technical Field

[0001] This invention relates to the field of valve technology, and in particular to a one-way valve with adjustable opening pressure. Background Technology

[0002] A check valve is a fluid control device primarily used to control the flow of fluids (such as liquids or gases) in only one direction, preventing reverse flow. These valves are commonly used in many industries and engineering applications, such as hydraulic systems, piping systems, pumping stations, and various mechanical equipment.

[0003] A check valve typically consists of a valve body, a valve core, and a pressure-applying structure. The valve body contains a channel with a stop flange formed in the channel wall, through which fluid flows. Under normal operating conditions, when the fluid pressure reaches the check valve's opening pressure, the valve core is pushed away from the stop flange, allowing fluid to pass through the valve. When the fluid stops flowing or flows in reverse, the valve core automatically closes under the force of the pressure-applying structure, preventing reverse flow.

[0004] However, the pressure-applying structure of existing check valves is usually a spring. One end of the spring is fixed relative to a positioning plate fixed to the wall of the fluid channel, and the other end abuts against the valve core. The maximum distance between the positioning plate and the valve core is constant, so the maximum length of the spring is constant, and the opening pressure value of the check valve is constant. As a result, the check valve has poor applicability and can only be used for a specific scenario. Summary of the Invention

[0005] The main objective of this invention is to provide a check valve with adjustable opening pressure, aiming to improve the applicability of check valves with adjustable opening pressure.

[0006] To achieve the above objectives, the present invention provides a one-way valve with adjustable opening pressure, comprising:

[0007] The valve body has a fluid channel, and the wall of the fluid channel is provided with a stop flange and a plurality of guide ribs, one end of the plurality of guide ribs being connected to one side of the stop flange.

[0008] The positioning plate has a first threaded hole and a flow hole. The periphery of the positioning plate is connected to the wall of the fluid channel and is located at the end of the guide rib away from the stop flange.

[0009] The valve core, the outer periphery of which is slidably engaged with a plurality of guide ribs;

[0010] A pressure regulating structure, comprising a pressure regulating screw and a locking nut, wherein the pressure regulating screw is threadedly engaged with a first threaded hole and is axially movable and adjustable, and a pressure regulating portion is provided at the end of the pressure regulating screw away from the valve core; the locking nut is provided with a second threaded hole and threadedly connected to the pressure regulating screw to lock the pressure regulating screw to the positioning plate; and,

[0011] A pressure-applying structure is installed under pressure between the valve core and the pressure regulating screw. The pressure-applying structure has a tendency to extend along the direction of the fluid channel, so that one edge of the valve core abuts against the stop flange.

[0012] In some embodiments of the present invention, the pressure regulating screw includes a rod body and a head connected to one end of the rod body. The radial dimension of the head is larger than that of the first threaded hole. The rod body is threadedly engaged with the first threaded hole, and the head is connected to the pressure applying structure.

[0013] In some embodiments of the present invention, the pressure regulating part is a polygonal groove formed on the end face of the rod.

[0014] In some embodiments of the present invention, an annular assembly step is formed around the periphery of the head, and the pressure-applying structure is a compression spring, one end of which is fitted onto the annular assembly step.

[0015] In some embodiments of the present invention, the annular assembly step is provided with at least two levels.

[0016] In some embodiments of the present invention, the pressure regulating structure further includes a retaining ring, and a second annular groove is provided on the periphery of the rod body. The retaining ring is installed in the second annular groove to restrict the rod body from moving towards the valve core.

[0017] The locking nut has an assembly groove at one axial end, and the bottom of the assembly groove has a second threaded hole. The assembly groove is aligned with the second annular retaining groove, and the retaining ring is assembled in the assembly groove.

[0018] In some embodiments of the present invention, when the head abuts against the positioning plate, the distance between the retaining ring and the positioning plate reaches a maximum value a, and the distance between the two ends of the pressure-applying structure connecting the head and the valve core reaches a maximum value b. The ratio of a to b is: 1 / 4 ≤ a / b ≤ 1 / 2.

[0019] In some embodiments of the present invention, the pressure regulating structure further includes an annular retaining spring, a first annular groove is formed on the wall of the fluid channel, the first annular groove is spaced apart from the plurality of guide ribs, the annular retaining spring is installed in the first annular groove, and the positioning plate is located between the annular retaining spring and the end faces of the plurality of guide ribs.

[0020] In some embodiments of the present invention, the annular retaining ring is a double-layer helical retaining ring.

[0021] In some embodiments of the present invention, the positioning plate has spaced positioning grooves on the periphery of the side facing the valve core, and one end of the guide rib is fitted into one of the positioning grooves.

[0022] In practical applications, the adjustable opening pressure check valve of the present invention allows fluid to enter through one side of the valve core in the fluid channel. When the fluid pressure reaches the opening pressure of the valve core, the valve core is pushed open, allowing the fluid to pass through the gap between the valve core and the stop flange, and then flow out through the flow hole from the other end of the fluid channel.

[0023] The operator can adjust the pressure of the pressure-applying structure by manipulating the pressure regulating mechanism, thereby changing the opening pressure of the valve core. Specifically, during adjustment, the pressure regulating screw is rotated directly through the pressure regulating part. The screw rotates and moves axially, thus pressing against the pressure-applying structure. The compression of the pressure-applying structure changes, and the pressure acting on the valve core changes simultaneously. The opening pressure of the adjustable-opening-pressure check valve increases or decreases accordingly, allowing it to handle different fluids and pressure requirements, thus improving its applicability. Attached Figure Description

[0024] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without creative effort.

[0025] Figure 1 A schematic diagram of the structure of an embodiment of the adjustable opening pressure check valve provided by the present invention from a certain perspective;

[0026] Figure 2 A schematic diagram of the structure of an embodiment of the adjustable opening pressure check valve provided by the present invention from another perspective;

[0027] Figure 3 A cross-sectional view of an embodiment of the adjustable opening pressure check valve provided by the present invention;

[0028] Figure 4 Another cross-sectional view of an embodiment of the adjustable opening pressure check valve provided by the present invention;

[0029] Figure 5 A cross-sectional view from another perspective of an embodiment of the adjustable opening pressure check valve provided by the present invention;

[0030] Figure 6 A schematic diagram of the valve body of the one-way valve with adjustable opening pressure provided by the present invention;

[0031] Figure 7 A schematic diagram of the locking nut of the adjustable opening pressure check valve provided by the present invention;

[0032] Figure 8 This is a schematic diagram of the valve body of the adjustable opening pressure check valve provided by the present invention from another perspective.

[0033] Explanation of icon numbers:

[0034] 100. Adjustable opening pressure check valve; 11. Valve body; 111. Fluid passage; 112. Stop flange; 113. Guide rib; 114. First annular groove; 12. Valve core; 13. Pressure regulating structure; 131. Pressure regulating screw; 1311. Rod body; 1312. Head; 1313. Annular assembly step; 1314. Pressure regulating part; 1315. Second annular groove; 132. Positioning plate; 1321. Flow hole; 1322. Positioning groove; 1323. First threaded hole; 133. Locking nut; 1331. Assembly groove; 1332. Liquid drainage hole; 1333. Second threaded hole; 134. Annular snap ring; 135. Snap ring; 14. Pressure application structure.

[0035] The realization of the objective, functional features and advantages of the present invention will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation

[0036] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present invention.

[0037] It should be noted that if the embodiments of the present invention involve directional indicators (such as up, down, left, right, front, back, etc.), the directional indicators are only used to explain the relative positional relationship and movement of the components in a specific posture. If the specific posture changes, the directional indicators will also change accordingly.

[0038] Furthermore, if the embodiments of this invention involve descriptions such as "first" or "second," these descriptions are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined with "first" or "second" may explicitly or implicitly include at least one of those features. Additionally, the use of "and / or" or "and / or" throughout the text includes three parallel solutions. For example, "A and / or B" includes solution A, solution B, or a solution where both A and B are satisfied simultaneously. Furthermore, the technical solutions of the various embodiments can be combined with each other, but this must be based on the ability of those skilled in the art to implement them. When the combination of technical solutions is contradictory or impossible to implement, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection claimed by this invention.

[0039] Please see Figures 1 to 3 This invention proposes a one-way valve 100 with adjustable opening pressure, comprising a valve body 11, a positioning plate 132, a valve core 12, a pressure regulating structure 13, and a pressure applying structure 14. The valve body 11 has a fluid channel 111, and the wall of the fluid channel 111 is provided with a stop flange 112 and multiple guide ribs 113, one end of each guide rib 113 being connected to one side of the stop flange 112. The periphery of the positioning plate 132 is connected to the wall of the fluid channel and is located at the end of the guide ribs 113 away from the stop flange 112. The outer periphery of the valve core 12 is slidably engaged with the multiple guide ribs 113. The pressure regulating structure 13 includes a pressure regulating screw 131 and a locking nut 133. The positioning plate 132 has a first threaded hole 1323 and a flow hole 1321. The pressure adjusting screw 131 is threadedly engaged with the first threaded hole 1323 and can be adjusted axially. The end of the pressure adjusting screw 131 away from the valve core 12 is provided with a pressure adjusting part 1314. The locking nut 133 is provided with a second threaded hole 1333 and is threadedly connected to the pressure adjusting screw 131 to lock the pressure adjusting screw 131 to the positioning plate 132. The pressure applying structure 14 is installed under pressure between the valve core 12 and the pressure adjusting screw 131. The pressure applying structure 14 has a tendency to extend along the extension direction of the fluid channel 111 so that one side edge of the valve core 12 abuts against the stop flange 112.

[0040] The valve body 11 is made of rigid material, generally metal, but plastic can also be used to cope with scenarios with low fluid pressure. There are generally at least three guide ribs 113 in the valve body 11. The at least three guide ribs 113 are evenly spaced around the valve core 12 to ensure the stability of the valve core 12 when sliding. Due to the presence of the guide ribs 113, a gap is formed between the periphery of the valve core 12 and the inner wall of the valve core 12 to allow fluid to flow.

[0041] The valve core 12 generally includes a rigid valve seat and a sealing gasket connected to one side of the valve seat. The valve seat is slidably connected to the guide rib 113, and the sealing gasket is used to abut against the stop flange 112 to block the fluid passage. The aforementioned pressure-applying structure 14 can specifically adopt a compression spring, a bellows, or two magnetically repelling structural components, which can generate continuous pressure on the positioning plates 132 at both ends and the valve core 12, and can produce deformation to restore its original shape.

[0042] In practical applications, the adjustable opening pressure check valve 100 of the present invention allows fluid to enter through one side of the valve core 12 in the fluid channel. When the pressure of the fluid reaches the opening pressure of the valve core 12, the valve core 12 is pushed open, and the fluid can then pass through the gap between the valve core 12 and the stop flange 112, and then flow out through the flow hole 1321 from the other end of the fluid channel.

[0043] The operator can adjust the pressure of the pressure-applying structure 14 by operating the pressure regulating structure 13, thereby changing the opening pressure value of the valve core 12. Specifically, during adjustment, the pressure regulating screw 131 is rotated directly through the pressure regulating part 1314. The pressure regulating screw 131 rotates and moves axially, thereby pressing against the pressure-applying structure 14. The compression of the pressure-applying structure 14 changes, and the pressure acting on the valve core 12 changes simultaneously. The opening pressure of the check valve also increases or decreases accordingly, enabling the check valve to cope with different fluids and different pressure requirements, thus increasing its applicability.

[0044] Furthermore, in some embodiments of the present invention, the pressure regulating screw 131 includes a rod body 1311 and a head 1312 connected to one end of the rod body 1311. The radial dimension of the head 1312 is larger than that of the first threaded hole 1323. The rod body 1311 is threadedly engaged with the first threaded hole 1323, and the head 1312 is connected to the pressure applying structure 14. The head 1312 can restrict the pressure regulating screw 131 from disengaging from the first threaded hole 1323 of the positioning plate 132 during rotation. Furthermore, the larger head 1312 facilitates connection to the pressure applying structure 14 and can match a larger pressure applying structure 14. This results in a larger area of ​​pressure applying structure 14 acting on the valve core 12, which helps prevent the valve core 12 from tilting and improves the stability of the one-way valve.

[0045] The aforementioned adjustment part is used to facilitate the operator's rotation of the pressure regulating screw 131. The structure of the adjustment part varies; for example, it can be configured as a torsion bar protruding from opposite sides of the pressure regulating screw 131, allowing the operator to rotate the screw 131. Preferably, in some embodiments of the present invention, the pressure regulating part 1314 is a polygonal groove formed on the end face of the rod 1311. This configuration avoids the outward protrusion of part of the pressure regulating screw 131, which could obstruct the operator's adjustment of the locking nut 133. Furthermore, it avoids obstructing fluid flow and prevents the pressure regulating screw 131 from being subjected to additional fluid impact forces, thus extending its service life.

[0046] In some embodiments of the present invention, an annular assembly step 1313 is formed around the periphery of the head 1312, and the pressure-applying structure 14 is a compression spring, one end of which is fitted onto the annular assembly step 1313. This arrangement makes assembly convenient; simply fitting one end of the compression spring onto the annular assembly step 1313 is sufficient. Furthermore, the annular assembly step 1313 effectively restricts radial movement of the compression spring, preventing it from twisting and falling off.

[0047] Furthermore, in some embodiments of the present invention, the annular assembly step 1313 is provided with at least two levels. This allows the annular assembly step 1313 of different levels to accommodate compression springs of different sizes, and also enables nested installation of multiple compression springs, ensuring the stability of the multiple compression springs during operation and preventing interference between adjacent compression springs.

[0048] To prevent the operator from over-tightening the pressure regulating bolt during adjustment, which could compress the pressure applying structure 14 to near its limit, restricting the movement range of the valve core 12 and thus affecting the flow rate of the check valve, in some embodiments of the present invention, the pressure regulating structure 13 further includes a retaining ring 135. A second annular groove 1315 is provided on the circumference of the rod body 1311, and the retaining ring 135 is installed in the second annular groove 1315 to restrict the movement of the rod body 1311 towards the valve core 12. An assembly groove 1331 is provided at one axial end of the locking nut 133, and a second threaded hole 1333 is provided at the bottom of the assembly groove 1331. The assembly groove 1331 is aligned with the second annular groove 1315, and the retaining ring 135 is assembled in the assembly groove 1331.

[0049] With the above solution, the retaining ring 135 is installed in the second annular groove 1315, which restricts the rod 1311 from moving closer to the valve core 12. This helps to prevent the pressure regulating screw 131 from over-compressing the pressure applying structure 14 (such as a compression spring) under pressure. On the one hand, it can protect the pressure applying structure 14, and on the other hand, it can ensure the maximum movement of the valve core 12.

[0050] In some embodiments of the present invention, the wall of the assembly groove 1331 is provided with a liquid-repellent hole 1332 to prevent liquid from accumulating in the assembly groove 1331.

[0051] Please see Figure 4 In some embodiments of the present invention, when the head 1312 abuts against the positioning plate 132, the distance between the retaining ring 135 and the positioning plate 132 reaches a maximum value 'a', and the distance between the two ends of the pressure-applying structure 14 connecting the head 1312 and the valve core 12 reaches a maximum value 'b'. The ratio of 'a' to 'b' is: 1 / 4 ≤ a / b ≤ 1 / 2. Specifically, it can be 1 / 4, 1 / 3, 2 / 5, 1 / 2, etc. By keeping the values ​​of 'a' and 'b' within an appropriate range, it can ensure that the pressure-applying structure 14 maintains stable performance during compression and expansion, avoiding performance degradation or damage to the pressure-applying structure 14 due to excessive compression. It also avoids the problem that when the distance between the retaining ring 135 and the positioning plate 132 reaches a relatively small maximum value 'a', the pressure applied by the pressure-applying structure 14 to the valve core 12 does not change much during the switching of the two extreme positions of the pressure regulating screw 131 in the axial direction, resulting in an insignificant adjustment effect.

[0052] Please see Figures 5 to 7 There are various specific implementations for fixing the positioning plate 132 inside the valve body 11. For example, the periphery of the positioning plate 132 is threadedly connected to the inner wall of the valve body 11. Preferably, in some embodiments of the present invention, the pressure regulating structure 13 further includes an annular retaining spring 134. A first annular groove 114 is formed on the wall of the fluid channel 111. The first annular groove 114 is spaced apart from a plurality of guide ribs 113. The annular retaining spring 134 is installed in the first annular groove 114, and the positioning plate 132 is limited between the annular retaining spring 134 and the end faces of the plurality of guide ribs 113. The positioning plate 132 has high installation stability and is convenient for assembly and maintenance.

[0053] The annular retaining ring 134 can be a common single-layer retaining ring, but in some embodiments of the present invention, the annular retaining ring 134 is a double-layer helical retaining ring. Compared with a single-layer retaining ring, the double-layer helical retaining ring provides a stronger clamping force, which can more stably fix the positioning plate 132 and prevent it from moving or rotating within the fluid channel 111. Furthermore, when using a double-layer helical retaining ring, the requirements for the dimensional and positional accuracy of the first annular groove 114 are lower, resulting in lower manufacturing costs.

[0054] In some embodiments of the present invention, the positioning plate 132 has spaced positioning grooves 1322 on its periphery facing the valve core 12, and one end of a guide rib 113 is fitted into one of the positioning grooves 1322. This allows the guide rib 113 to circumferentially limit the positioning plate 132, preventing the positioning plate 132 from rotating due to fluid impact, which could lead to wear and abnormal noise in the pressure regulating structure 13 and the pressure applying structure 14. Furthermore, when the operator rotates the pressure regulating screw 131, there is no need to fix the positioning plate 132, facilitating adjustment.

[0055] Please see Figure 8 In some embodiments of the present invention, the guide rib 113 is configured as a strip-shaped rib with a fan-shaped cross-section. The arc c of the fan-shaped cross-section of the guide rib 113 is not less than π / 12 and not greater than π / 4, specifically π / 12, π / 8, π / 6, π / 4, etc. This ensures that the guide rib 113 provides stable support for the sliding of the valve core 12, preventing it from tilting, and also ensures the flow area of ​​the fluid channel, allowing the fluid to pass smoothly.

[0056] The above description is merely an exemplary embodiment of the present invention and does not limit the patent scope of the present invention. Any equivalent structural transformations made using the contents of the present invention's specification and drawings under the technical concept of the present invention, or direct / indirect applications in other related technical fields, are included within the patent protection scope of the present invention.

Claims

1. A one-way valve with adjustable opening pressure, characterized in that, include: The valve body has a fluid channel, and the wall of the fluid channel is provided with a stop flange and a plurality of guide ribs, one end of the plurality of guide ribs being connected to one side of the stop flange. The positioning plate has a first threaded hole and a flow hole. The periphery of the positioning plate is connected to the wall of the fluid channel and is located at the end of the guide rib away from the stop flange. The valve core has a sliding fit between its outer periphery and a plurality of guide ribs. The positioning plate has spaced positioning grooves on its periphery facing the valve core. One end of a guide rib is fitted into a positioning groove to restrict the rotation of the positioning plate. The guide rib has a fan-shaped cross section, and the arc c of the fan-shaped interface is not less than π / 12 and not greater than π / 4. The pressure regulating structure includes a pressure regulating screw, a locking nut, and a ring retaining ring. The pressure regulating screw is threaded into the first threaded hole and can be adjusted axially. The end of the pressure regulating screw away from the valve core has a pressure regulating part. The locking nut has a second threaded hole and is threaded to the pressure regulating screw to lock it to the positioning plate. The pressure regulating screw includes a rod body. The pressure regulating structure also includes a retaining ring. A second annular groove is formed on the circumference of the rod body, and the retaining ring is installed in the second annular groove. The axial direction of the locking nut... One end of the upper part is provided with an assembly groove, and the bottom of the assembly groove is provided with a second threaded hole. The assembly groove is aligned with the second annular retaining groove. The retaining ring is assembled in the assembly groove to restrict the movement of the rod towards the valve core. The groove wall of the assembly groove is provided with a liquid-repellent hole. The wall surface of the fluid channel is provided with a first annular retaining groove. The first annular retaining groove is spaced apart from a plurality of guide ribs. The annular retaining spring is installed in the first annular retaining groove. The positioning plate is located between the annular retaining spring and the end faces of the plurality of guide ribs; and... A pressure-applying structure is installed under pressure between the valve core and the pressure regulating screw. The pressure-applying structure has a tendency to extend along the extension direction of the fluid channel, so that one edge of the valve core abuts against the stop flange. The pressure regulating screw also includes a head connected to one end of the rod body. The head is connected to the pressure applying structure. An annular assembly step is formed around the periphery of the head. The pressure applying structure is a compression spring. There are multiple compression springs. One end of the compression spring is fitted onto the annular assembly step. The annular assembly step has at least two levels. Different levels of the annular assembly step are adapted to compression springs of different sizes.

2. The one-way valve with adjustable opening pressure as described in claim 1, characterized in that, The radial dimension of the head is larger than that of the first threaded hole, and the rod body is threadedly engaged with the first threaded hole.

3. The one-way valve with adjustable opening pressure as described in claim 1, characterized in that, The pressure regulating part is a polygonal groove formed on the end face of the rod.

4. The one-way valve with adjustable opening pressure as described in claim 1, characterized in that, When the head abuts against the positioning plate, the distance between the retaining ring and the positioning plate reaches the maximum value a, and the distance between the two ends of the pressure-applying structure connecting the head and the valve core reaches the maximum value b. The ratio of a to b is: 1 / 4 ≤ a / b ≤ 1 / 2.

5. The one-way valve with adjustable opening pressure as described in claim 1, characterized in that, The ring snap ring is a double-layered helical snap ring.

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