Water hammer eliminator

Abstract

The utility model discloses a water hammer eliminator, which belongs to the technical field of pipeline protection accessories, and adopts the technical scheme that the water hammer eliminator comprises a sleeve, a joint, a sealing element and a piston, the sleeve is provided with a pipe orifice and a sealing part, an inner cavity is arranged between the pipe orifice and the sealing part, the joint is connected with the pipe orifice, and the joint is provided with a water inlet runner communicated with the inner cavity; the sealing piece is arranged in the inner cavity and seals the sealing part, the piston is arranged in the inner cavity in a sliding mode, and buffer gas is filled between the sealing piece and the piston. The buffer gas filled in the inner cavity is sealed through the sealing piece and the piston, so that the buffer gas in the inner cavity can be prevented from slowly leaking from the sealing part, and the air tightness of the sleeve is effectively ensured; the water hammer arrestor is convenient to assemble and suitable for most water hammer arresters, the original structure and production process of the casing pipe are not damaged, and upgrading or further research and development of the casing pipe which is produced and stored are not affected.

Description

Technical Field

[0001] The utility model belongs to the technical field of pipeline protection accessories, and particularly relates to a water hammer arrester. Background Art

[0002] Water hammer, also known as water shock, refers to the phenomenon that the flow rate of water or other liquids changes suddenly and the pressure fluctuates greatly during the transportation process due to the sudden opening and closing of valves or the sudden start and stop of water pumps. Taking positive water hammer as an example, when water hammer occurs, a water flow shock wave will be generated due to the inertia of the fluid. This large fluctuation of pressure shock wave can easily cause the pipeline to rupture due to local overpressure and damage the water-using equipment in the pipeline.

[0003] A Chinese patent with announcement number CN205298936U discloses a water hammer absorber, including a sleeve, one end of which is a sealing end integrally connected to the sleeve, a sleeve head is sleeved on the outside of the other end of the sleeve, a piston assembly is slidably connected inside the sleeve, gas is filled between the piston assembly and the sealing section, and a joint is threadedly connected on the sleeve head. The joint is connected to a conveying pipeline, and when the pressure of the flowing medium in the conveying pipeline changes, the flowing medium applies pressure to the piston assembly through the joint, causing the piston assembly to slide toward the inside of the sleeve and further compress the gas in the sleeve, and the air pressure in the sleeve is used to counteract the pressure of the flowing medium, so that the piston assembly slides axially in the sleeve to achieve dynamic balance, thereby balancing the pressure change of the flowing medium in the conveying pipeline and the fluctuation amplitude of the flowing medium, and avoiding water hammer phenomenon in the conveying pipeline.

[0004] The material of the above-mentioned casing is copper, carbon steel or cast iron, so that the sealing end and the casing can be integrally formed, and the airtightness inside the casing can be ensured without the use of welding process; however, the water hammer absorber made of copper is relatively expensive and has poor market competitiveness, and carbon steel and cast iron are prone to rust when in contact with water for a long time. Therefore, most of the current casings are produced using corrosion-resistant stainless steel pipe sections, which have a predetermined length and are penetrated at both ends. One end needs to be processed by high-frequency heating and sealing using a stainless steel pipe sealing machine to form the above-mentioned sealing end, but after sealing, only the flatness of the outer end of the stainless steel pipe can be ensured, and the inside of the pipe section is still relatively rough, and there is a phenomenon that the tiny gap at the sealing point will slowly leak. Limited by the existing detection means, it is currently difficult to detect whether there is a slow leak at the sealing point of the pipe section. Directly using this kind of pipe section as the casing of the water hammer eliminator, the gas filled in the casing will gradually leak over time, resulting in reduced working performance of the water hammer eliminator and affecting its service life.

[0005] In addition, the water hammer preventer and the piping system provided with the water hammer preventer disclosed in the Chinese patent with the announcement number CN211260008U specifically disclose a water hammer preventer, i.e., a water hammer eliminator, which uses a threaded plug to seal the end of the casing, but still cannot completely eliminate the problem of slow leakage of gas inside the casing. Utility Model Content

[0006] The purpose of the utility model is to propose a water hammer eliminator in view of the above problems existing in the prior art. The technical problem to be solved by the utility model is: how to effectively ensure the air tightness of the casing.

[0007] The above technical objectives of the utility model can be achieved through the following technical solutions:

[0008] A water hammer arrester comprises a sleeve, a joint, a seal and a piston, wherein the sleeve has a pipe mouth and a sealing portion, an inner cavity is provided between the pipe mouth and the sealing portion, the joint is connected to the pipe mouth, and the joint has a water inlet channel connected to the inner cavity; the seal is arranged in the inner cavity and seals the sealing portion, the piston is slidably arranged in the inner cavity, and a buffer gas is filled between the seal and the piston.

[0009] Through the above technical scheme, the buffer gas filled in the inner cavity passes through the seal and the piston seal. When the piston absorbs the force of the water hammer and slides toward the seal, the buffer gas can provide buffering for the piston. The utility model can prevent the buffer gas in the inner cavity from slowly leaking from the sealing part, thereby ensuring the service life of the water hammer arrester, and is more convenient to assemble. It is suitable for most water hammer arresters without destroying the original structure and production process of the sleeve, and does not affect the upgrade of the sleeve that has been produced and in stock.

[0010] In the above water hammer arrester, a sealing groove is provided on the side of the sealing member, a sealing ring is arranged in the sealing groove, and the outer ring of the sealing ring is tightly pressed against the inner cavity. The sealing ring can further improve the sealing performance of the sealing member to the sealing portion.

[0011] In the above-mentioned water hammer arrester, the sealing member is provided with a clearance groove on the side of the sealing portion. The clearance groove can make way for the bumps and burrs at the inner end of the sealing portion, and can also accommodate the residual gas between the sealing portion and the sealing member, so that the sealing member can be installed in the inner cavity more easily.

[0012] In the above-mentioned water hammer arrester, a gasket is provided between the joint and the piston, and the inner end of the joint limits the axial position of the gasket. The gasket has a central hole connected to the water inlet channel, and the diameter of the central hole is smaller than the diameter of the inner end of the water inlet channel. The water flow at the inner end of the water inlet channel can directly act on the gasket, and the gasket pushes the piston as a whole to slide toward the sealing part, thereby preventing the piston from being greatly deformed by the water hammer (referring to the lower end of the piston tilting toward the central axis), and further ensuring the airtightness of the buffer gas in the inner cavity.

[0013] In the above water hammer arrester, the piston is provided with a groove connected to the central hole, which facilitates the expansion of the piston from the center to the outside, so that the gap between the piston and the inner cavity is reduced, thereby ensuring the airtightness of the buffer gas in the inner cavity.

[0014] In the above water hammer arrester, the diameter of the groove is greater than or equal to the diameter of the central hole. The groove can not only provide water flow, but also prevent the end of the piston close to the gasket from irregular and severe deformation, thereby ensuring the working performance of the piston.

[0015] In the above-mentioned water hammer arrester, the outer wall of the piston is in contact with the inner cavity via an O-ring 1. The O-ring 1 can ensure the airtightness between the piston and the inner cavity without affecting the normal sliding of the piston.

[0016] In the above water hammer arrester, an annular groove is formed on the piston. When the piston is affected by the water hammer and expands from the center outward, the annular groove can be squeezed, thereby further improving the air tightness between the piston and the inner cavity.

[0017] In the above water hammer arrester, a protrusion is provided on the end of the piston facing the sealing member.

[0018] In the above water hammer arrester, the joint is provided with an assembly groove, the pipe mouth is connected to the assembly groove, the pipe mouth and the assembly groove are closed by extrusion or riveting, which reduces the connection difficulty between the sleeve and the joint and facilitates production.

[0019] In summary, the beneficial effects of the present invention compared with the prior art are as follows:

[0020] 1. The buffer gas filled in the inner cavity is sealed by the seal and piston, which can prevent the buffer gas in the inner cavity from slowly leaking from the sealing part, effectively ensuring the air tightness of the casing, and thus ensuring the service life of the water hammer eliminator;

[0021] 2. Water hammer can directly act on the gasket, pushing the piston to slide toward the seal through the gasket, thereby absorbing the force of water hammer, effectively avoiding the piston from being greatly deformed by water hammer, and ensuring the airtightness of the buffer gas in the inner cavity;

[0022] 3. This water hammer arrester is easy to assemble and is suitable for most water hammer arresters. It does not damage the original structure and production process of the casing and does not affect the upgrade or further research and development of the casing that has been produced and in stock. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It is a schematic diagram of the external structure of the embodiment;

[0024] Figure 2 for Figure 1 A cross-sectional schematic diagram of

[0025] Figure 3 It is a schematic diagram of the explosion structure of the casing and the joint;

[0026] Figure 4 is a schematic diagram of the structure of the seal;

[0027] Figure 5 Schematic diagram of the explosion structure of the piston and gasket.

[0028] Reference numerals: 100, sleeve; 110, tube opening; 120, sealing portion; 130, inner cavity;

[0029] 200, joint; 210, water inlet channel; 220, assembly groove; 230, O-ring 2;

[0030] 300, sealing member; 310, sealing groove; 311, sealing ring; 320, clearance groove;

[0031] 400, piston; 410, protrusion; 420, O-ring 1; 430, annular groove; 440, groove;

[0032] 500, washer; 510, center hole. DETAILED DESCRIPTION

[0033] The following are specific embodiments of the present invention and the accompanying drawings to further describe the technical solution of the present invention, but the present invention is not limited to these embodiments.

[0034] A water hammer arrester, such as Figures 1 to 5As shown, it includes a sleeve 100, a joint 200, a seal 300 and a piston 400. The sleeve 100 has a pipe mouth 110 and a sealing part 120. The sleeve 100 has an inner cavity 130 between the pipe mouth 110 and the sealing part 120. The joint 200 is connected to the pipe mouth 110, and the joint 200 has a water inlet channel 210 connected to the inner cavity 130; the seal 300 is arranged in the inner cavity 130 and seals the sealing part 120. The piston 400 is slidably arranged in the inner cavity 130. Buffer gas is filled between the seal 300 and the piston 400. The buffer gas can apply a pre-tightening force to the piston 400 and the seal 300, so that the piston 400 is close to the joint 200, and the seal 300 is pressed against the inner side of the sealing part 120; the buffer gas can be dry ice, carbon dioxide gas or conventional inert gas.

[0035] like Figure 2 , Figure 4 As shown, specifically, a sealing groove 310 is provided on the side of the sealing member 300, a sealing ring 311 is provided in the sealing groove 310, and the outer ring of the sealing ring 311 is tightly pressed against the inner cavity 130. Furthermore, a clearance groove 320 is provided on the end surface of the sealing member 300 facing the sealing portion 120, and the clearance groove 320 is used to accommodate air or burrs or bumps on the inner side surface of the sealing portion 120.

[0036] A gasket 500 is arranged between the joint 200 and the piston 400, and the inner end of the joint 200 limits the axial position of the gasket 500. The gasket 500 has a central hole 510 connected to the water inlet channel 210, and the diameter of the central hole 510 is smaller than the diameter of the inner end of the water inlet channel 210. Under normal conditions, the buffer gas acts on the seal 300 and the piston 400, so that the piston 400 presses the gasket 500 against the inner end of the joint 200, and the seal 300 presses against the inner side of the sealing part 120, ensuring that the seal 300 will not be displaced after assembly. The water hammer acts on the gasket 500, thereby pushing the gasket 500 and the piston 400 to slide toward the seal 300 as a whole, avoiding the piston 400 from being greatly deformed beyond the setting due to the water hammer, or avoiding the end of the piston 400 close to the gasket 500 from being irregularly deformed, thereby ensuring the airtightness between the piston 400 and the inner cavity 130.

[0037] like Figure 2 , Figure 5 As shown, in some embodiments, the piston 400 is made of a material with elastic deformation properties such as rubber or silicone, and a protrusion 410 is provided at the end of the piston 400 facing the seal 300. The outer wall of the piston 400 is in contact with the inner cavity 130 through an O-ring 420, and the outer wall of the piston 400 is also provided with an annular groove 430 for the piston 400 to expand.

[0038] A groove 440 connected to the center hole 510 is provided at the center of the piston 400, and the diameter of the groove 440 is greater than or equal to the diameter of the center hole 510. The water flow passing through the center hole 510 can act on the groove 440, so that the piston 400 can expand and deform from the center toward the inner cavity 130, so that the O-ring 1 420 outside the piston 400 can be pressed against the inner cavity 130, and the air tightness of the piston 400 when sliding toward the sealing member 300 is improved.

[0039] like Figure 2 , Figure 3 As shown, the outer wall of the joint 200 is provided with an assembly groove 220 , and the pipe mouth 110 is located in the assembly groove 220 after closing inwards, and the joint 200 and the inner wall of the pipe mouth 110 are sealed by an O-ring 230 .

[0040] The working principle of the utility model is as follows:

[0041] The joint 200 is connected to the water pipe so that the water flow in the water pipe fills the water inlet channel 210, the center hole 510, and the groove 440; if water hammer occurs in the water pipe, the force of the water hammer acts on the gasket 500 and the groove 440 through the water inlet channel 210, and the groove 440 expands toward the inner cavity 130 and presses the O-ring 1 420 and the annular groove 430, so that the O-ring 1 420 and the outer wall of the piston 400 are pressed against the inner cavity 130, and the gasket 500 pushes the piston 400 to slide toward the sealing member 300, and the buffer gas provides buffering for the piston 400, thereby eliminating the force of the water hammer on the water pipe;

[0042] After the buffer gas absorbs the impact force of the water hammer, it pushes the piston 400 and the gasket 500 back to their original positions, so that the gasket 500 is pressed tightly against the inner end of the joint 200 again.

[0043] Among them, the buffer gas in the inner cavity 130 is sealed by the seals 300 and the piston 400 at both ends. The buffer gas in the inner cavity 130 is difficult to leak from the sealing part 120. Even if there is a slow leakage in the sealing part 120, the service life of the water hammer eliminator can be guaranteed, and the assembly is more convenient, without destroying the original structure and production process of the sleeve 100, and does not affect the further upgrade of the sleeve 100 that has been produced and in stock.

[0044] The specific embodiments described in this article are merely examples of the spirit of the utility model; technicians in the technical field to which the utility model belongs can make various modifications or additions to the described specific embodiments or replace them in a similar manner, but will not deviate from the spirit of the utility model or exceed the scope defined by the attached claims.

Claims

1. A water hammer arrester, Features: The invention comprises a sleeve (100), a joint (200), a sealing member (300) and a piston (400); the sleeve (100) has a pipe mouth (110) and a sealing portion (120); an inner cavity (130) is provided between the pipe mouth (110) and the sealing portion (120); the joint (200) is connected to the pipe mouth (110), and the joint (200) has a water inlet channel (210) which is connected to the inner cavity (130); the sealing member (300) is arranged in the inner cavity (130) and seals the sealing portion (120); the piston (400) is slidably arranged in the inner cavity (130); and a buffer gas is filled between the sealing member (300) and the piston (400).

2. The water hammer arrester according to claim 1, Features: A sealing groove (310) is provided on the side of the sealing member (300), a sealing ring (311) is provided in the sealing groove (310), and the outer ring of the sealing ring (311) is tightly pressed against the inner cavity (130).

3. The water hammer arrester according to claim 1, Features: The sealing member (300) is provided with a clearance groove (320) on the side facing the sealing portion (120).

4. The water hammer arrester according to any one of claims 1 to 3, Features: A gasket (500) is provided between the joint (200) and the piston (400), and the inner end of the joint (200) limits the axial position of the gasket (500). The gasket (500) has a center hole (510) connected to the water inlet channel (210), and the diameter of the center hole (510) is smaller than the diameter of the inner end of the water inlet channel (210).

5. The water hammer arrester according to claim 4, Features: The piston (400) is provided with a groove (440) communicating with the central hole (510).

6. The water hammer arrester according to claim 5, Features: The diameter of the groove (440) is greater than or equal to the diameter of the central hole (510).

7. The water hammer arrester according to any one of claims 1 to 3, Features: The outer wall of the piston (400) is in contact with the inner cavity (130) via an O-ring (420).

8. The water hammer arrester according to any one of claims 1 to 3, Features: The piston (400) is provided with an annular groove (430).

9. The water hammer arrester according to any one of claims 1 to 3, Features: The piston (400) is provided with a protrusion (410) at the end facing the sealing member (300).

10. The water hammer arrester according to any one of claims 1 to 3, Features: The joint (200) is provided with an assembly groove (220), and the pipe mouth (110) is connected to the assembly groove (220).

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