Silencing check valve

Abstract

The utility model belongs to the technical field of valves, and particularly relates to a silencing check valve which is characterized in that guide positioning rods are arranged on the outer side of a guide rod, a plurality of guide positioning rods are evenly arranged in the circumferential direction, the upper ends of the guide rod and the guide positioning rods are fixedly connected with a guide connecting plate, a guide positioning frame is arranged below the guide connecting plate, and the guide positioning frame is fixedly connected with the guide rod. The guide positioning frame is fixedly connected with the guide sleeve, side guide sleeves are arranged between the guide positioning frame and the guide positioning rods, the lower ends of the guide rods and the lower ends of the guide positioning rods are connected with the valve clack, and the guide positioning rods are sleeved with springs respectively. The utility model has the advantages that the spring matrix structure enables the support of the spring to be more stable, and the noise generated by the shaking of the valve clack in the opening process of the valve is reduced; due to a synchronous guiding and positioning structure, the stability of a valve clack movement mechanism is improved, and noise generated when the valve is at the maximum opening degree is reduced; the valve clack structure of the welding structure reduces noise generated by valve clack shaking under the influence of fluid pressure waves.

Description

Technical Field

[0001] This utility model belongs to the field of valve technology, and in particular relates to a silent check valve. Background Technology

[0002] A check valve is a valve whose opening and closing element is a circular valve disc that relies on its own weight and the pressure of the medium to prevent backflow. It is also called a non-return valve, one-way valve, reflux valve, or isolation valve. The valve disc movement is divided into lift type and swing type. Check valves are commonly used as foot valves in pumping devices to prevent water backflow. When used in combination with a gate valve, a check valve can provide safety isolation, but its disadvantages include high resistance and poor sealing when closed. The function of a check valve is to allow the medium to flow in only one direction and prevent flow in the opposite direction. This type of valve usually operates automatically. Under the pressure of fluid flowing in one direction, the valve disc opens; when the fluid flows in the opposite direction, the fluid pressure and the weight of the valve disc act on the valve seat, thus cutting off the flow. The noise generated by a check valve during operation is mainly due to imbalance in the flow passage or improper installation, which can produce large pressure waves, causing the valve core to vibrate or pulsate, resulting in noise. At the same time, an unreasonable gap between the valve core and the valve seat can also cause pressure waves during fluid transition, thus causing noise.

[0003] Chinese utility model patent application number 201520552518.6 discloses a check valve sealing structure and a silent check valve using this sealing structure. The valve plate includes a valve plate with a sealing surface for sealing with a valve port. The valve plate has a sealing ring mounting groove with an opening on the sealing surface, surrounding the valve port and containing a sealing ring. The valve body has a valve port and a check valve sealing structure that seals with the valve port. The check valve sealing structure includes a valve plate with a sealing ring mounting groove, in which the sealing ring is located. In this check valve structure, a single spring is used as the force source for valve disc reset. Because the valve disc is much larger in diameter than the spring, the valve disc easily vibrates under the pressure wave of the fluid, generating noise, thus the noise reduction effect is not ideal.

[0004] Chinese utility model patent application number 202320065257.X discloses a high-performance buffer and noise-reducing check valve, including a valve body with an inlet port and an outlet port. Several flow-diverting ribs are provided on the inner peripheral wall of the valve body at the outlet port. A connecting bushing for buffering flow obstruction and enhancing the check seal strength is movably connected at the inlet port. A check assembly for preventing backflow of the medium is provided inside the valve body. The check assembly consists of a valve core, a valve disc, and an elastic element. A fixing block is provided inside the connecting bushing to facilitate the movable connection of the valve core. A sealing assembly is provided between the connecting bushing and the inner peripheral wall of the valve body. In this structure, the valve disc is engaged with the valve body through the valve core at both the top and bottom, which can minimize noise. However, the structure at the inlet end becomes more complex, and noise can still be generated when fluid flows through. Utility Model Content

[0005] The purpose of this utility model is to provide a silent check valve that overcomes the shortcomings of existing technologies. It employs a spring matrix structure to reduce the dimensional difference between the valve disc and the spring support range, thereby reducing noise generated by valve disc vibration during valve opening. It also uses a synchronous guiding and positioning structure to reduce noise when the valve is at its maximum opening. The welded valve disc structure improves the valve disc's own strength and reduces the impact of fluid pressure waves. The arc-shaped design of the valve disc facing the inlet ensures unobstructed flow within the valve body, reducing fluid resistance and eliminating noise generated during fluid passage. A rubber sealing ring is provided between the valve disc and the valve seat to reduce noise during check valve reset.

[0006] To achieve the above objectives, this utility model employs the following technical solution:

[0007] A silent check valve includes a valve body, a valve seat, a valve disc, a spring, a rubber sealing ring, a guide sleeve, a guide rod, and a bracket. The valve body contains the valve seat and valve disc, with the valve seat located on the valve body at the inlet end. The guide sleeve is connected to the valve body at the outlet end via the bracket, and is centrally located. A guide rod is located inside the guide sleeve, with its bottom end connected to the valve disc. A guide positioning rod is located on the outer side of the guide rod. Multiple guide positioning rods are evenly arranged circumferentially. The upper ends of the guide rods and guide positioning rods are fixedly connected to a guide connecting plate. A guide positioning frame is located below the guide connecting plate, and is fixedly connected to the guide sleeve. A side guide sleeve is provided between the guide positioning frame and each guide positioning rod. The lower ends of the guide rods and guide positioning rods are connected to the valve disc. A spring is fitted onto each guide positioning rod.

[0008] Furthermore, the number of guide positioning rods is 2-4.

[0009] Furthermore, the side guide sleeve is fixedly connected to the guide positioning frame via a pressure cap.

[0010] Furthermore, the valve disc is a welded assembly, including an arc panel, a frame, a reinforcing plate, vertical ribs, and a mounting plate. The frame is connected to the edge of the arc panel, and a reinforcing plate is connected between the frames. Vertical ribs are provided between the arc panel and the reinforcing plate. A mounting plate is provided above the reinforcing plate. The mounting plate is welded to the frame by a continuous weld. The mounting plate is provided with mounting holes for connecting guide rods and guide positioning rods.

[0011] Furthermore, the rubber sealing ring is connected to the edge of the valve disc by a pressure plate and screws, the contact surface between the rubber sealing ring and the valve seat is a bevel, and a wear-resistant alloy layer is welded onto the contact surface of the valve seat.

[0012] Furthermore, the valve seat and valve body are clearance-fitted, and an O-ring is provided between the valve seat and the valve body.

[0013] Furthermore, the convex surface of the arc panel faces the water inlet side and has a thickness of 3-6 mm.

[0014] Compared with the prior art, the beneficial effects of this utility model are:

[0015] 1) By adopting a spring matrix structure, the size difference between the valve disc and the spring assembly support range is reduced, the spring support is more stable, thereby reducing the noise generated by valve disc vibration during valve opening;

[0016] 2) By adopting a structure of multiple synchronous guide positioning rods, the stability of the valve disc movement mechanism is improved, and the noise of the valve at its maximum opening is reduced;

[0017] 3) By adopting a welded valve disc structure, the strength and structural stability of the valve disc are significantly improved, and the noise generated by valve disc vibration under the influence of fluid pressure waves is reduced.

[0018] 4) By adopting an arc-shaped design with the valve disc facing the water inlet, the flow channel inside the valve body at the water inlet is unobstructed, reducing the resistance to fluid flow and eliminating the noise generated when the fluid flows through.

[0019] 5) By providing a rubber sealing ring between the valve disc and the valve seat, the noise during check valve reset can be effectively reduced. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of an embodiment of the present invention, showing the off position;

[0021] Figure 2 This is a schematic diagram of the open position structure of an embodiment of this utility model;

[0022] Figure 3 yes Figure 1 Top view;

[0023] In the diagram: 1-valve seat, 2-O-ring seal, 3-valve body, 4-valve disc, 5-rubber seal, 6-pressure plate, 7-screw, 8-guide rod, 9-spring, 10-guide positioning frame, 11-guide connecting plate, 12-screw, 13-pressure cap, 14-side guide sleeve, 15-guide sleeve, 16-bracket, 17-guide positioning rod, 18-arc panel, 19-frame, 20-reinforcing plate, 21-vertical rib, 22-mounting plate. Detailed Implementation

[0024] The technical solution of this utility model will be clearly and completely described below with reference to specific embodiments. Obviously, the described embodiments are some embodiments of this utility model, but not all embodiments.

[0025] To more clearly illustrate the specific embodiments of this utility model or the technical solutions in the prior art, the specific embodiments used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the specific embodiments described below are some embodiments of this utility model. For those skilled in the art, other specific embodiments can be obtained based on these specific embodiments without creative effort.

[0026] The components of the present invention described and shown in the specific embodiments herein can be arranged and designed in numerous different configurations. Therefore, the following detailed description of the embodiments of the present invention provided in the specific embodiments is not intended to limit the scope of the claimed invention, but only to illustrate selected embodiments of the invention.

[0027] See Figure 1-3This is a schematic diagram of an embodiment of a silencer check valve of this utility model, including a valve body 3, a valve seat 1, a valve disc 4, a spring 9, a rubber sealing ring 5, a guide sleeve 15, a guide rod 8, and a bracket 16. The valve body 3 is provided with a valve seat 1 and a valve disc 4. The valve seat 1 is located on the valve body 3 at the water inlet end. The guide sleeve 15 is connected to the valve body 3 at the water outlet end through the bracket 16. The guide sleeve 15 is centered. The guide sleeve 15 is provided with a guide rod 8. The bottom end of the guide rod 8 is connected to the valve disc 4. The outer side of the guide rod 8 is provided with a guide positioning rod 17. The number of guide positioning rods 17 is 2-4, preferably 2. Two guide positioning rods 17 are evenly arranged around the circumference. The upper ends of the guide rods 8 and 17 are fixedly connected to the guide connecting plate 11 by screws 12. A guide positioning frame 10 is provided below the guide connecting plate 11. The guide positioning frame 10 is fixedly connected to the guide sleeve 15. A side guide sleeve 14 is provided between the guide positioning frame 10 and each guide positioning rod 17. The lower ends of the guide rods 8 and 17 are connected to the valve disc 4. A spring 9 is fitted on each guide positioning rod 17. The side guide sleeve 14 is fixedly connected to the guide positioning frame 10 by a pressure cap 13. The rubber sealing ring 5 is connected to the edge of the valve disc 4 by a pressure plate 6 and screws 7. The contact surface between the rubber sealing ring 5 and the valve seat 1 is beveled, and a wear-resistant alloy layer is welded onto the contact surface of the valve seat 1. The rubber sealing ring 5 has a lip-shaped structure and is set along the edge of the valve disc 4 for easy maintenance and replacement, while also reducing collision noise when the valve is closed. To prevent the rubber sealing ring 5 from breaking and falling off after long-term use, a hard sealing strip is also provided on the edge of the valve disc 4. When the rubber sealing ring 5 falls off, the hard sealing strip and the valve seat 1 can still achieve a seal, but the noise will be slightly louder than when the rubber sealing ring 5 is present. At this time, the fall off of the rubber sealing ring 5 can be detected in time, and replacement and repair can be arranged.

[0028] For ease of maintenance, the valve seat 1 and the valve body 3 are clearance-fitted, and an O-ring 2 is provided between the valve seat 1 and the valve body 3 to ensure sealing performance.

[0029] In this embodiment, the valve disc 4 is a welded assembly, including an arc panel 18, a frame 19, a reinforcing plate 20, vertical ribs 21, and a mounting plate 22. The frame 19 is connected to the edge of the arc panel 18, and the reinforcing plate 20 is connected between the frames 19. Vertical ribs 21 are provided between the arc panel 18 and the reinforcing plate 20. The mounting plate 22 is provided above the reinforcing plate 20. The mounting plate 22 is welded to the frame 19 by a continuous weld. The mounting plate 22 has mounting holes for connecting the guide rod 8 and the guide positioning rod 17. This welded valve disc structure significantly improves the strength and structural stability of the valve disc, thereby reducing the noise generated by valve disc vibration under the influence of fluid pressure waves. The convex surface of the arc panel 18 faces the water inlet side and has a thickness of 3-6 mm. When the fluid flows along the surface of the arc panel 18, the occurrence of turbulence can be minimized, thereby significantly reducing the noise generated when the fluid passes through. The flow channel in the valve body at the water inlet end is unobstructed, which helps to reduce the resistance to fluid passage and also helps to reduce noise.

[0030] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A silent check valve, comprising a valve body, a valve seat, a valve disc, a spring, a rubber sealing ring, a guide sleeve, a guide rod, and a bracket, wherein the valve body contains a valve seat and a valve disc, the valve seat is located on the valve body at the inlet end, the guide sleeve is connected to the valve body at the outlet end via the bracket, the guide sleeve is centrally located, and a guide rod is provided inside the guide sleeve, the bottom end of the guide rod being connected to the valve disc, characterized in that, The outer side of the guide rod is provided with a guide positioning rod, and multiple guide positioning rods are evenly arranged around the circumference. The upper ends of the guide rod and the guide positioning rod are fixedly connected to the guide connecting plate. A guide positioning frame is provided below the guide connecting plate. The guide positioning frame is fixedly connected to the guide sleeve. A side guide sleeve is provided between the guide positioning frame and each guide positioning rod. The lower ends of the guide rod and the guide positioning rod are connected to the valve disc. A spring is respectively sleeved on each guide positioning rod.

2. The silencer check valve according to claim 1, characterized in that, The number of guide positioning rods is 2-4.

3. The silencer check valve according to claim 1, characterized in that, The side guide sleeve is fixedly connected to the guide positioning frame via a pressure cap.

4. The silencer check valve according to claim 1, characterized in that, The valve disc is a welded assembly, including an arc panel, a frame, a reinforcing plate, vertical ribs, and a mounting plate. The frame is connected to the edge of the arc panel, and a reinforcing plate is connected between the frames. Vertical ribs are provided between the arc panel and the reinforcing plate. A mounting plate is provided above the reinforcing plate. The mounting plate is welded to the frame by a continuous weld. The mounting plate is provided with mounting holes for connecting guide rods and guide positioning rods.

5. A silencer check valve according to claim 1, characterized in that, The rubber sealing ring is connected to the edge of the valve disc by a pressure plate and screws. The contact surface between the rubber sealing ring and the valve seat is a bevel, and a wear-resistant alloy layer is welded onto the contact surface of the valve seat.

6. A silencer check valve according to claim 1, characterized in that, The valve seat and valve body are clearance-fitted, and an O-ring is provided between the valve seat and the valve body.

7. A silencer check valve according to claim 4, characterized in that, The convex surface of the arc panel faces the water inlet side and has a thickness of 3-6mm.

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