Water hammer eliminator

Abstract

The utility model relates to the technical field of pipe fitting manufacturing, in particular to a water hammer eliminator which comprises a pipe body and an installation cover fixedly arranged at one end of the pipe body, an installation sinking groove is formed in a piston, an impact opening communicated with the bottom side of the installation sinking groove is formed in the pipe body, and the piston and a spring are arranged in the installation sinking groove; a sealing gasket is fixedly arranged on the inner wall of the installation sinking groove, an elastic boss capable of conducting elastic deformation is fixedly arranged on the side face, away from the piston, of the sealing gasket, and a containing cavity allowing the piston to be placed in is formed in the side face, facing the installation cover, of the elastic boss. The two sides of the piston abut against the spring and the inner wall of the containing cavity respectively, and the spring is used for extruding the piston and the elastic boss so that the outer side face of the elastic boss can abut against the bottom side of the installation sinking groove. In the application, the inner wall of the mounting sinking groove is blocked by the sealing gasket, so that water cannot penetrate through the sealing gasket and the elastic boss to enter the cavity provided with the spring and the piston, and the possibility that the spring is corroded is further reduced.

Description

Technical Field

[0001] The present application relates to the technical field of pipe fitting manufacturing, and in particular to a water hammer arrester. Background Art

[0002] PPR pipes are commonly used plastic pipes, offering corrosion resistance, high temperature resistance, and high pressure resistance. They are widely used in water supply, drainage, heating, and other fields. However, in PPR piping systems, operations such as the rapid opening and closing of water pumps and valves can cause water hammer, which can impact and damage the piping system. Therefore, installing water hammer arresters in PPR piping systems has become a necessary protective measure.

[0003] In related art, a piston-type water hammer arrester primarily consists of a sealed container containing a chamber filled with pressurized gas, a slidable piston, and a spring. When water hammer occurs, a shock wave acts on the piston, causing it to move, dissipating the energy generated by the water hammer and eliminating it. Subsequently, the spring forces the piston back to its initial position, preparing for the next water hammer event.

[0004] However, in practice, wear and tear over time create a gap between the piston and the inner wall of the container. This gap allows pressurized water to enter the container cavity during water hammer. This can increase resistance to piston movement, potentially causing it to become stuck or damaged, and can also corrode the gas and other components within the container, such as the spring. This can severely impact the performance and service life of the water hammer arrester, leaving room for improvement. Utility Model Content

[0005] The purpose of this application is to provide a water hammer arrester to solve the problem in the above-mentioned related art that the piston may be worn, causing water to enter the container cavity, affecting the performance and service life of the water hammer arrester.

[0006] The water hammer arrester provided in this application adopts the following technical solution:

[0007] A water hammer eliminator comprises a tube body and a mounting cover fixed at one end of the tube body, a mounting groove is provided on the side of the tube body facing the mounting cover, an impact port connected to the bottom side of the mounting groove is provided on the side of the tube body away from the mounting cover, a piston for sealing the impact port and a spring for squeezing the piston are provided in the mounting groove; a sealing gasket is fixed on the inner wall of the mounting groove, an elastic boss capable of elastic deformation is fixed on the side of the sealing gasket away from the piston, and an accommodating cavity for the piston to be placed is provided on the side of the elastic boss facing the mounting cover; two sides of the piston are respectively in contact with the spring and the inner wall of the accommodating cavity, and the spring is used to squeeze the piston and the elastic boss so that the outer side surface of the elastic boss is tightly pressed against the bottom side of the mounting groove.

[0008] By adopting the above technical solution, when the water hammer arrester is used, both ends of the pipe body are pre-connected to the corresponding PPR pipes. When water hammer occurs, water pressure is injected into the impact port. The water pressure overcomes the pressure of the spring and impacts the elastic boss and piston, causing the outer surface of the elastic boss to deform. After the water hammer is eliminated, the piston and elastic boss return to their original position under the action of the spring. The installation of the sealing gasket blocks the inner wall of the mounting trough, preventing water from passing through the sealing gasket and elastic boss into the cavity where the spring and piston are installed. This reduces the possibility of spring corrosion and improves the performance and service life of the water hammer arrester.

[0009] Optionally, the tube body is provided with a fixed groove on the inner wall of the installation groove, and a nest is embedded on the inner wall of the fixed groove; the inner side surface of the nest is provided with an internal thread, and the installation cover is fixed with a fixing part on the side facing the tube body, and the outer periphery of the fixing part is provided with an external thread that matches the internal thread of the nest.

[0010] By adopting the above technical solution, due to the coordinated arrangement of the nesting and fixing parts, a detachable connection between the mounting cover and the tank body is achieved, which facilitates subsequent disassembly, inspection and maintenance of the water hammer arrester.

[0011] Optionally, a retaining ring is fixed on the inner edge of the opening of the nest away from the mounting cover, and an installation gap for inserting a sealing gasket is preset between the retaining ring and the fixing part, and the side of the fixing part away from the mounting cover is pressed against one side of the sealing gasket.

[0012] By adopting the above technical solution, due to the setting of the retaining ring, during the installation process of the sealing gasket, the sealing gasket is placed inside the nest in advance. When the fixing part is screwed into the nest, the fixing part is pressed against the side of the sealing gasket away from the installation cover, thereby realizing a detachable connection of the sealing gasket, which is convenient for subsequent regular inspection and replacement of the sealing gasket.

[0013] Optionally, a guide rod is fixedly provided on the side of the piston facing the spring, the spring is sleeved on the outer circumference of the guide rod, and a guide sleeve for the guide rod to pass through is fixedly provided on the side of the mounting cover facing the piston.

[0014] By adopting the above technical solution, due to the provision of the guide rod and the guide sleeve, the possibility of misalignment or deviation of the spring and the piston during the sliding process is reduced, and the stability of the piston during the sliding process is improved.

[0015] Optionally, a limit sleeve is provided on the outer circumference of the mounting cover, a positioning protrusion is provided on the side of the limit sleeve facing the mounting cover, and a positioning groove for the positioning protrusion to be placed is provided on the mounting cover; a limit rod is fixed to the end of the guide rod away from the piston, the diameter of the limit rod is smaller than the outer diameter of the guide rod, a limit hook is fixed on the outer circumference of the limit rod, a positioning through hole is provided on the positioning protrusion for the limit hook to pass through and slide, and a limiting ring groove is provided on the inner edge of the opening of the positioning through hole away from the tube body, which abuts against one side of the limit hook.

[0016] By adopting the above technical solution, due to the coordinated arrangement of the limit rod and the limit sleeve, during the sliding process of the piston, the limit rod slides synchronously in the positioning through hole, and the limiting hook is used to limit the sliding stroke of the piston, thereby reducing the possibility of permanent deformation or damage to the spring and the elastic boss caused by excessive sliding of the piston, thereby extending the service life of the water hammer eliminator.

[0017] Optionally, a cover plate is provided on the limit sleeve, and a receiving groove for the cover plate to be placed is provided on the side of the limit sleeve away from the mounting cover. A fixing rod is fixed on the side of the cover plate facing the limit sleeve, and the end of the fixing rod is connected to the limit hook passing through the positioning through hole.

[0018] By adopting the above technical solution, the upper opening of the positioning through hole is protected due to the installation of the cover plate, reducing the possibility of external impurities clogging the positioning through hole and thus affecting the sliding of the guide rod on the piston.

[0019] Optionally, a deformation gap is preset between the outer peripheral surface of the elastic boss and the inner wall of the mounting groove.

[0020] By adopting the above technical solution, due to the setting of the deformation gap, when the elastic boss is deformed by the impact of water pressure, there is enough gap to facilitate the deformation of the elastic boss, thereby extending the service life of the elastic boss.

[0021] Optionally, a drain pipe communicating with the deformation gap is fixedly provided on the outer periphery of the tube body.

[0022] By adopting the above technical solution, due to the arrangement of the drain pipe on the pipe body, when water hammer occurs, excess water can be discharged in time through the drain pipe, thereby reducing the damage to the pipeline caused by the water hammer phenomenon and extending the service life of the water hammer eliminator.

[0023] In summary, this application includes at least one of the following beneficial technical effects:

[0024] 1. Due to the setting of the sealing gasket, the inner wall of the installation trough is blocked, so that water cannot pass through the sealing gasket and the elastic boss into the cavity where the spring and piston are installed, thereby reducing the possibility of corrosion of the spring and improving the performance and service life of the water hammer arrester.

[0025] 2. Due to the coordinated arrangement of the limit rod and the limit sleeve, the limit rod slides synchronously in the positioning through hole during the sliding process of the piston, and the limit hook is used to limit the sliding stroke of the piston, thereby reducing the possibility of permanent deformation or damage to the spring and elastic boss caused by excessive sliding of the piston, thereby extending the service life of the water hammer arrester. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without any creative work.

[0027] Figure 1 It is a schematic diagram of the overall structure of an embodiment of the present application;

[0028] Figure 2 This is a schematic diagram of the explosion structure of an embodiment of the present application;

[0029] Figure 3 This is a partial cross-sectional structural diagram of the embodiment of the present application embodying the installation and coordination of the sealing gasket;

[0030] Figure 4 yes Figure 3 A magnified schematic diagram of part A;

[0031] Figure 5 It is a partial cross-sectional structural diagram of the embodiment of the present application showing the installation and cooperation of the piston and the spring.

[0032] In the figure, 1. tube body; 11. mounting groove; 111. annular convex ring; 12. impact port; 13. fixed groove; 14. deformation gap; 15. drain pipe; 2. mounting cover; 21. fixing part; 22. guide sleeve; 23. positioning groove; 3. piston; 31. guide rod; 32. limiting rod; 33. limiting hook; 4. spring; 5. nesting; 51. retaining ring; 6. sealing gasket; 61. elastic boss; 611. accommodating chamber; 7. limiting sleeve; 71. positioning protrusion; 711. positioning through hole; 712. limiting ring groove; 72. accommodating groove; 8. cover plate; 81. fixing rod. DETAILED DESCRIPTION

[0033] The present application is further described in detail below in conjunction with all the accompanying drawings.

[0034] Example:

[0035] Reference Figure 1 、 Figure 2 and Figure 3 A water hammer arrester includes a pipe body 1 and a mounting cover 2 fixed to one end of the pipe body 1. A mounting groove 11 is formed on the side of the pipe body 1 facing the mounting cover 2. An impact port 12 communicating with the bottom of the mounting groove 11 is formed on the side of the pipe body 1 away from the mounting cover 2. A piston 3 for sealing the impact port 12 and a spring 4 for squeezing the piston 3 are provided in the mounting groove 11.

[0036] Both ends of the pipe body 1 are connected to the corresponding PPR pipes. When water hammer occurs, water pressure is injected into the impact port 12. The water pressure overcomes the pressure of the spring 4, causing the spring 4 to be compressed and squeezed, thereby causing the piston 3 to slide inside the installation groove 11.

[0037] Reference Figure 3 The pipe body 1 is provided with a fixed sink groove 13 on the inner wall of the installation sink groove 11, and a metal nesting 5 is embedded on the inner wall of the fixed sink groove 13; the pipe body 1 is made of plastic material, and when the pipe body 1 is injection molded, the metal nesting 5 is embedded and fixed with the inner wall of the fixed sink groove 13 on the pipe body 1;

[0038] The inner side surface of the nest 5 is provided with an internal thread, and the side of the mounting cover 2 facing the tube body 1 is integrally formed with a fixing portion 21, and the outer periphery of the fixing portion 21 is provided with an external thread that matches the internal thread of the nest 5; when the mounting cover 2 is installed and fixed, the fixing portion 21 can be screwed into the inside of the nest 5.

[0039] Reference Figure 3 and Figure 4 The inner wall of the mounting groove 11 is provided with a rubber sealing gasket 6. The sealing gasket 6 is integrally formed with an elastic boss 61 capable of elastic deformation on the side away from the piston 3. The elastic boss 61 is provided with an accommodating cavity 611 for the piston 3 to be placed on the side facing the mounting cover 2.

[0040] A retaining ring 51 is integrally formed on the inner edge of the opening of the nest 5 away from the mounting cover 2. After the fixing portion 21 is screwed into the nest 5, an installation gap for the sealing gasket 6 to be placed is preset between the retaining ring 51 and the fixing portion 21; during the process of the fixing portion 21 being screwed into the nest 5, the side of the fixing portion 21 away from the mounting cover 2 is pressed against one side of the sealing gasket 6, thereby achieving the installation and fixation of the sealing gasket 6.

[0041] Reference Figure 3 A deformation gap 14 is defined between the outer surface of the elastic boss 61 and the inner wall of the mounting trough 11 to facilitate deformation of the elastic boss 61 in response to water pressure. A drain pipe 15 is fixedly provided on the outer periphery of the pipe body 1 and communicates with the deformation gap 14. This drain pipe 15 is connected to an external pipeline or water tank. When water hammer occurs, excess water can be promptly drained through the drain pipe 15, thereby minimizing damage to the pipeline caused by water hammer.

[0042] Reference Figure 3 An annular convex ring 111 is integrally formed on the bottom side of the mounting groove 11 around the inner opening of the impact port 12. When the elastic boss 61 blocks the impact port 12, the outer side surface of the elastic boss 61 is tightly pressed against the upper side surface of the annular convex ring 111.

[0043] Reference Figure 5 A guide rod 31 is integrally formed on the side of the piston 3 facing the spring 4. A guide sleeve 22, through which the guide rod 31 passes, is fixedly mounted on the side of the mounting cover 2 facing the piston 3. The spring 4 is sleeved around the outer circumference of the guide rod 31. In a compressed state, the spring 4's ends respectively abut against the inner side of the mounting cover 2 and one side of the piston 3. The other side of the piston 3 abuts against the inner wall of the accommodating chamber 611. Under normal conditions, the spring 4 compresses the piston 3 and the elastic boss 61, causing the outer side of the elastic boss 61 to abut against the bottom side of the mounting recess 11.

[0044] Reference Figure 5 A limiting sleeve 7 is sleeved on the outer periphery of the mounting cover 2, and a positioning protrusion 71 is integrally formed on the side of the limiting sleeve 7 facing the mounting cover 2, and a positioning recess 23 for the positioning protrusion 71 to be placed is opened on the mounting cover 2; a limiting rod 32 is integrally formed on the end of the guide rod 31 away from the piston 3, and the diameter of the limiting rod 32 is smaller than the outer diameter of the guide rod 31;

[0045] A stop hook 33 is fixed to the outer periphery of the stop rod 32. A positioning hole 711 is defined in the positioning projection 71, through which the stop hook 33 slides. A stop ring groove 712 is defined along the inner edge of the opening of the positioning hole 711, distal from the tube body 1, to abut against one side of the stop hook 33. This limits the sliding travel of the piston 3, reducing the possibility of excessive sliding of the piston 3 causing permanent deformation or damage to the spring 4 and the elastic boss 61, thereby extending the service life of the water hammer arrester.

[0046] Reference Figure 5 A cover plate 8 is provided on the side of the limiting sleeve 7 away from the mounting cover 2, and a receiving groove 72 for the cover plate 8 to be placed is opened on the side of the limiting sleeve 7 away from the mounting cover 2. A fixing rod 81 is integrally formed on the side of the cover plate 8 facing the limiting sleeve 7, and the fixing rod 81 is clamped and fixed with the limiting hook 33 passing through the positioning through hole 711; thereby protecting the upper side opening of the positioning through hole 711 and reducing the possibility of external impurities clogging the positioning through hole 711 and thereby affecting the sliding of the guide rod 31 on the piston 3.

[0047] The implementation principle of the embodiment of this application is:

[0048] When the water hammer arrester is used, both ends of the pipe body 1 are pre-connected to the corresponding PPR pipes. When water hammer occurs, water pressure is injected into the impact port 12. The water pressure overcomes the pressure of the spring 4 and impacts the elastic boss 61 and the piston 3. At this time, the outer peripheral surface of the elastic boss 61 is deformed. After the water hammer phenomenon is eliminated, the piston 3 and the elastic boss 61 are reset under the action of the spring 4.

[0049] Unless otherwise defined, the terms or scientific terms used in this application should have the usual meanings understood by people with ordinary skills in the field to which this application belongs. The "first", "second", "third" and similar words used in this application do not indicate any order, quantity or importance, but are only used to distinguish different components. "A" or "one" and other similar words do not indicate a quantity limit, but rather indicate the existence of at least one. "Include" or "comprising" and other similar words mean that the elements or objects appearing before "include" or "comprising" cover the elements or objects listed after "include" or "comprising" and their equivalents, and do not exclude other elements or objects. "Up", "down", "left", "right" and the like are only used to indicate relative positional relationships. When the absolute position of the described object changes, the relative positional relationship may also change accordingly.

[0050] The examples of this specific embodiment are all preferred embodiments of this application and are not intended to limit the scope of protection of this application. Identical components are represented by the same reference numerals. Therefore, any equivalent changes made based on the structure, shape, and principle of this application should be included in the scope of protection of this application.

Claims

1. A water hammer arrester, comprising a pipe body (1) and a mounting cover (2) fixed at one end of the pipe body (1), a mounting recess (11) being provided on the side of the pipe body (1) facing the mounting cover (2), an impact opening (12) being provided on the side of the pipe body (1) away from the mounting cover (2) and communicating with the bottom side of the mounting recess (11), a piston (3) for blocking the impact opening (12) and a spring (4) for pressing the piston (3) being provided in the mounting recess (11); It is characterized in that A sealing gasket (6) is fixedly arranged on the inner wall of the installation groove (11); an elastic boss (61) capable of elastic deformation is fixedly arranged on the side of the sealing gasket (6) away from the piston (3); a receiving cavity (611) for receiving the piston (3) is provided on the side of the elastic boss (61) facing the installation cover (2); two sides of the piston (3) are respectively in contact with the spring (4) and the inner wall of the receiving cavity (611); the spring (4) is used to squeeze the piston (3) and the elastic boss (61) so that the outer side surface of the elastic boss (61) is tightly in contact with the bottom side of the installation groove (11).

2. A water hammer arrester according to claim 1, characterized in that: The pipe body (1) is provided with a fixed sink groove (13) on the inner wall of the installation sink groove (11), and a nesting (5) is embedded on the inner wall of the fixed sink groove (13); The inner side surface of the nest (5) is provided with an internal thread, the side of the mounting cover (2) facing the tube body (1) is fixed with a fixing portion (21), and the outer periphery of the fixing portion (21) is provided with an external thread matching the internal thread of the nest (5).

3. A water hammer arrester according to claim 2, characterized in that: A retaining ring (51) is fixedly arranged on the inner edge of the opening of the nest (5) away from the mounting cover (2); an installation gap for inserting the sealing gasket (6) is preset between the retaining ring (51) and the fixing portion (21); and the side of the fixing portion (21) away from the mounting cover (2) is tightly pressed against one side of the sealing gasket (6).

4. A water hammer arrester according to claim 1, characterized in that: A guide rod (31) is fixedly provided on the side of the piston (3) facing the spring (4); the spring (4) is sleeved on the outer circumference of the guide rod (31); and a guide sleeve (22) for the guide rod (31) to penetrate is fixedly provided on the side of the mounting cover (2) facing the piston (3).

5. A water hammer arrester according to claim 4, characterized in that: A limiting sleeve (7) is sleeved on the outer periphery of the installation cover (2), a positioning protrusion (71) is provided on the side of the limiting sleeve (7) facing the installation cover (2), and a positioning recess (23) is provided on the installation cover (2) for the positioning protrusion (71) to be placed therein; A limiting rod (32) is fixedly provided at the end of the guide rod (31) away from the piston (3); the diameter of the limiting rod (32) is smaller than the outer diameter of the guide rod (31); a limiting hook (33) is fixedly provided on the outer periphery of the limiting rod (32); a positioning through hole (711) is provided on the positioning protrusion (71) for the limiting hook (33) to pass through and slide; and a limiting ring groove (712) is provided on the inner edge of the opening of the positioning through hole (711) away from the tube body (1) and abuts against one side of the limiting hook (33).

6. A water hammer arrester according to claim 5, characterized in that: The limiting sleeve (7) is provided with a cover plate (8), and a receiving groove (72) for the cover plate (8) to be placed is provided on the side of the limiting sleeve (7) away from the mounting cover (2), and a fixing rod (81) is fixedly provided on the side of the cover plate (8) facing the limiting sleeve (7), and the end of the fixing rod (81) is connected to a limiting hook (33) penetrating the positioning through hole (711).

7. The water hammer arrester according to claim 1, characterized in that: A deformation gap (14) is preset between the outer peripheral surface of the elastic boss (61) and the inner wall of the mounting recess (11).

8. The water hammer arrester according to claim 1, characterized in that: A drain pipe (15) communicating with the deformation gap (14) is fixedly provided on the outer periphery of the tube body (1).

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