Water hammer impact eliminating device for conveying pipeline

Abstract

The utility model discloses a conveying pipeline water hammer impact eliminating device which comprises a preheater, a first pipeline, a second pipeline, a third pipeline and a reaction kettle, the preheater is connected with the first pipeline, the reaction kettle is connected with the third pipeline, and the two ends of the second pipeline are connected with the first pipeline and the third pipeline respectively. A liquid storage bend is connected between the first pipeline and the second pipeline, a one-way valve and a water hammer eliminator are arranged on the first pipeline in series, and an expansion bend is connected between the third pipeline and the second pipeline. According to the water hammer impact eliminating device for the conveying pipeline, the influence caused by negative pressure of the conveying pipeline can be reduced through the liquid storage bend, the stress of the conveying pipeline can be effectively reduced through the expansion bend, and meanwhile the water hammer eliminator and the one-way valve can eliminate the impact generated by the change of the flow speed of mixed stock solution in the conveying pipeline; therefore, adverse effects caused by rapid change of the flow speed of the mixed stock solution are eliminated, the risk of breakage and leakage of a conveying pipeline is avoided, and noise and vibration can be reduced.

Description

TECHNICAL FIELD

[0001] The utility model relates to chemical liquid raw material conveying system technical field, especially relates to a conveying pipeline water hammer impact elimination device. BACKGROUND

[0002] Water hammer is also called water strike, is water (or other liquid) in the conveying process, due to the valve sudden opening or closing, water pump sudden stop, suddenly open and close guide vane etc. Reason, the flow rate suddenly changes, and the pressure produces the phenomenon of large amplitude fluctuation. In the polystyrene production system, the mixed raw liquid will be conveyed from the preheater to the reaction kettle, and the conveying is also carried out by pipeline conveying.

[0003] However, in the prior art, the conveying pipeline between the preheater and the reaction kettle is directly connected with the two, and the pressure wave propagation and rebound caused by the sudden change of the flow state of the mixed raw liquid in the conveying pipeline can cause the occurrence of water hammer phenomenon, thereby bringing many hazards to the conveying pipeline, such as:

[0004] 1. Water hammer can produce sudden and strong pressure impact, so that the conveying pipeline and the system inside bear the pressure exceeding the design bearing capacity, which can cause pipeline rupture, pipeline joint loosening, valve damage and other equipment damage accidents; 2. The impact force generated by water hammer can cause the joints, sealing elements and pipeline connections in the pipeline system to leak or leak; 3. The pressure wave propagation and rebound caused by water hammer can produce intense vibration and noise, and these noises and vibrations can have adverse effects on the surrounding equipment, structure and personnel. UTILITY MODEL CONTENT

[0005] The utility model aims at providing a conveying pipeline water hammer impact elimination device which can reduce the risk of pipeline rupture and leakage, and reduce noise and vibration.

[0006] To solve the above technical problems, the utility model can adopt the following technical scheme to realize:

[0007] A conveying pipeline water hammer impact elimination device, comprising a preheater, a first pipeline, a second pipeline, a third pipeline and a reaction kettle, the discharge end of the preheater is connected with the first pipeline, the feed end of the reaction kettle is connected with the third pipeline, the two ends of the second pipeline are connected with the first pipeline and the third pipeline respectively, a liquid storage bend is connected between the first pipeline and the second pipeline, a water hammer eliminator and a check valve are arranged in series on the first pipeline, and the water hammer eliminator is located between the liquid storage bend and the check valve, and an expansion bend is connected between the third pipeline and the second pipeline.

[0008] In one of the embodiments, the water hammer eliminator comprises an eliminator body, a piston and an elastic member, the piston is arranged inside the eliminator body, and the side wall of the piston is in sliding seal with the inner wall of the eliminator body, thereby the inside of the eliminator body is divided into a closed cavity and an open cavity, and the elastic member is arranged in the closed cavity, one end of the elastic member is in abutment with the piston, and the other end of the elastic member is in abutment with the inner wall of the eliminator body.

[0009] In one of the embodiments, the eliminator body is provided with a vent hole in communication with the closed cavity.

[0010] In one of the embodiments, the eliminator body comprises a shell and a cover, the cover is tightly closed and covers the open end of the shell, the piston and the elastic member are respectively arranged inside the shell, the vent hole is arranged at the top of the shell, and a connecting head is arranged at the bottom of the cover.

[0011] In one of the embodiments, the side wall of the piston is provided with a first sealing ring.

[0012] In one of the embodiments, the cover and the shell are connected by threads, and a sealing gasket is pressed and fixed.

[0013] In one of the embodiments, the outer wall of the connecting head is provided with a sealing groove, and a second sealing ring is arranged in the sealing groove.

[0014] In one of the embodiments, the top of the shell is provided with a pressure gauge.

[0015] In one of the embodiments, the elastic member is a spring. Beneficial effects

[0016] The utility model discloses a water hammer impact elimination device of conveying pipeline, through the liquid storage bend that adds between first pipeline and second pipeline, can reduce the influence that conveying pipeline negative pressure brings, and the expansion bend that adds between third pipeline and second pipeline can effectively reduce conveying pipeline stress, simultaneously, setting one-way valve and water hammer eliminator on first pipeline, through water hammer eliminator can eliminate the impact that mixed raw liquid flow rate change in conveying pipeline produces, and then eliminate the adverse effect that mixed raw liquid flow rate sharp change produces, and then combining one-way valve can ensure that mixed raw liquid does not backflow, and then greatly reduce water hammer influence, finally avoid the risk that conveying pipeline appears rupture and leakage, and can reduce the generation of noise and vibration, make mixed raw liquid from preheater to reaction kettle conveying smooth. BRIEF DESCRIPTION OF DRAWINGS

[0017] Figure 1 It is the schematic diagram of the utility model water hammer impact elimination device of conveying pipeline;

[0018] Figure 2 It is the sectional view of the utility model water hammer impact elimination device of conveying pipeline.

[0019] As shown in the drawings:

[0020] 100, preheater; 200, first pipe; 300, second pipe; 400, third pipe; 500, reactor; 600, liquid storage bend; 700, one-way valve; 800, water hammer eliminator; 810, eliminator body; 811, shell; 812, cover; 820, piston; 821, first sealing ring; 830, elastic member; 840, closed cavity; 850, open cavity; 860, through hole; 870, connecting head; 871, sealing groove; 872, second sealing ring; 880, sealing gasket; 900, expansion bend. DETAILED DESCRIPTION

[0021] In order to make the above objectives, features and advantages of the present application more apparent, specific embodiments of the present application will be described in detail below with reference to the accompanying drawings. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present application. It will be apparent, however, to one skilled in the art that the present application can be practiced without some or all of these details. In other instances, well known process steps have not been described in detail in order to avoid unnecessarily obscuring the present application. It will be apparent to one skilled in the art that the present application can be practiced without some or all of these details. In other instances, well known process steps have not been described in detail in order to avoid unnecessarily obscuring the present application.

[0022] It is to be understood that where the terms such as "fixedly" are used herein, the term "fixedly" can mean that one element is directly on another element or can mean that one element is indirectly on another element with one or more intervening elements present. It is to be understood that where the term "connected" is used herein, the term "connected" can mean that one element is directly connected to another element or can mean that one element is indirectly connected to another element through one or more intervening elements. It is to be understood that where the term "directly connected" is used herein, the term "directly connected" means that one element is connected to another element without any intervening elements present.

[0023] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used in the description of the application herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the application. As used in this description, the terms "and / or" includes any and all combinations of one or more of the associated listed items.

[0024] Reference will now be made to Figure 1The application discloses a water hammer impact eliminating device for a conveying pipeline, which comprises a preheater 100, a first pipeline 200, a second pipeline 300, a third pipeline 400 and a reaction kettle 500, the outlet end of the preheater 100 is connected with the first pipeline 200, the inlet end of the reaction kettle 500 is connected with the third pipeline 400, the two ends of the second pipeline 300 are respectively connected with the first pipeline 200 and the third pipeline 400, a liquid storage bend 600 is arranged between the first pipeline 200 and the second pipeline 300, a one-way valve 700 and a water hammer eliminator 800 are arranged in series on the first pipeline 200, the water hammer eliminator 800 is located between the liquid storage bend 600 and the one-way valve 700, and an expansion bend 900 is arranged between the third pipeline 400 and the second pipeline 300.

[0025] Specifically, in the embodiment, the preheater 100 is connected with the reaction kettle 500 through the first pipeline 200, the second pipeline 300 and the third pipeline 400, the liquid storage bend 600 is arranged between the first pipeline 200 and the second pipeline 300, the expansion bend 900 is arranged between the third pipeline 400 and the second pipeline 300, the positions of the liquid storage bend 600 and the expansion bend 900 are not limited and can be mutually adjusted, the first pipeline 200, the liquid storage bend 600, the second pipeline 300, the expansion bend 900 and the third pipeline 400 form a conveying pipeline, the conveying pipeline is provided with a conveying pump (not shown in the figure), the conveying pump is used for conveying mixed raw liquid in the preheater 100 to the reaction kettle 500 through the conveying pipeline, the liquid storage bend 600 can effectively reduce the influence caused by negative pressure of the conveying pipeline during the conveying process, the expansion bend 900 can reduce the stress of the conveying pipeline, thereby avoiding the breakage and leakage of the conveying pipeline and the loosening of a joint of the conveying pipeline; in addition, the one-way valve 700 and the water hammer eliminator 800 are arranged on the first pipeline 200, the water hammer eliminator 800 can eliminate the impact caused by the change of the flow rate of the mixed raw liquid in the conveying pipeline, thereby eliminating the adverse influence caused by the sharp change of the flow rate of the mixed raw liquid, the one-way valve 700 can ensure that the mixed raw liquid does not backflow (when the vacuum at the front end of the conveying pipeline cannot be reached, the mixed raw liquid will backflow, at this time, the one-way valve 700 is closed to avoid the backflow of the mixed raw liquid), thereby greatly reducing the influence of water hammer, finally avoiding the breakage and leakage risk of the conveying pipeline, and reducing the generation of noise and vibration, so that the mixed raw liquid is smoothly conveyed from the preheater to the reaction kettle.

[0026] Please refer to Figure 2In order to eliminate the impact caused by the sharp change of the flow rate of the mixed raw liquid in the conveying pipeline, the water hammer eliminator 800 in the embodiment comprises an eliminator body 810, a piston 820 and an elastic member 830. The piston 820 is arranged in the interior of the eliminator body 810, and the side wall of the piston 820 is in sliding sealing with the inner wall of the eliminator body 810, so as to divide the interior of the eliminator body 810 into a closed cavity 840 and an open cavity 850. The elastic member 830 is arranged in the closed cavity 840, and one end of the elastic member 830 abuts against the piston 820, and the other end of the elastic member 830 abuts against the inner wall of the eliminator body 810.

[0027] The eliminator body 810 is connected with the first pipeline 200, so that the open cavity 850 is in communication with the first pipeline 200. When the flow rate state of the mixed raw liquid in the conveying pipeline changes suddenly, the mixed raw liquid will act on the bottom of the piston 820 through the open cavity 850, and the piston 820 is driven to move towards the closed cavity 840 by pressure, and the elastic member 830 is extruded. The elastic member 830 is a spring, and the elastic member 830 provides a counterforce when being extruded, thereby playing a certain buffering role. In this way, the impact pressure is unloaded, the space of the conveying pipeline is increased, the pressure is balanced, the influence caused by the pressure rise is eliminated, the adverse effects of the liquid impact and the sharp change of the flow rate of the mixed raw liquid on the conveying pipeline are eliminated, the risk of rupture and leakage of the conveying pipeline is avoided, and the noise and vibration can be effectively reduced.

[0028] Since there is air in the closed cavity 840, when the piston 820 moves towards the closed cavity 840, in order to enable the piston 820 to move smoothly, the eliminator body 810 is provided with an air vent hole 860 in communication with the closed cavity 840. The air in the closed cavity 840 can be discharged outward through the air vent hole 860, so that the piston 820 will not be hindered from moving towards the closed cavity 840 due to excessive air pressure.

[0029] In order to realize the sealing sliding between the side wall of the piston 820 and the inner wall of the eliminator body 810, the first sealing ring 821 is arranged on the side wall of the piston 820. The first sealing ring 821 can be used for sealing and slidingly connecting the piston 820 and the eliminator body 810, so as to ensure that the piston 820 can alleviate the influence caused by the change of the pressure of the conveying pipeline.

[0030] Meanwhile, in order to facilitate the assembly of the water hammer eliminator 800, the eliminator body 810 in the embodiment comprises a shell 811 and a cover 812, the cover 812 is tightly closed on the open end of the shell 811, and the cover 812 and the shell 811 are connected by threads, and the sealing gasket 880 is pressed and fixed, the piston 820 and the elastic member 830 are respectively located inside the shell 811, the air hole 860 is arranged on the top of the shell 811, the connecting head 870 is arranged on the bottom of the cover 812, the outer wall of the connecting head 870 is provided with the sealing groove 871, and the second sealing ring 872 is arranged in the sealing groove 871.

[0031] The cover 812 and the shell 811 can be connected by threads, and the sealing between the cover 812 and the shell 811 can be ensured by the sealing gasket 870, meanwhile, the water hammer eliminator 800 can be connected with the first pipeline 200 through the connecting head 870, and the sealing between the water hammer eliminator 800 and the first pipeline 200 can be ensured by the second sealing ring 872, by fully sealing the water hammer eliminator 800, the mixed raw liquid cannot leak out from the gap of the water hammer eliminator 800, and the influence of the water hammer on the conveying pipeline can be eliminated by the water hammer eliminator 800.

[0032] Finally, in order to ensure the safety performance, the pressure gauge (not shown in the figure) is further arranged on the top of the shell 811, the pressure in the closed cavity 840 can be monitored in real time by the pressure gauge.

[0033] The basic principle and main features of the utility model and the advantages of the utility model are shown and described above. Any person skilled in the art can smoothly implement the utility model according to the drawings shown in the specification and the above description; however, any slight change, modification and equivalent change made by any person skilled in the art without departing from the technical scheme of the utility model, using the above disclosed technical content, are equivalent embodiments of the utility model; meanwhile, any equivalent change, modification and evolution of the above embodiments made according to the essential technology of the utility model are still within the protection scope of the technical scheme of the utility model.

Claims

1. A device for eliminating water hammer impact in a pipeline, characterized in that: The device comprises a preheater, a first pipeline, a second pipeline, a third pipeline and a reactor, the outlet end of the preheater is connected with the first pipeline, the inlet end of the reactor is connected with the third pipeline, and the two ends of the second pipeline are respectively connected with the first pipeline and the third pipeline; A liquid storage bend is connected between the first pipeline and the second pipeline, a one-way valve and a water hammer eliminator are arranged in series on the first pipeline, the water hammer eliminator is located between the liquid storage bend and the one-way valve, and an expansion bend is connected between the third pipeline and the second pipeline.

2. The delivery line water hammer mitigation device of claim 1, wherein: The water hammer eliminator comprises an eliminator body, a piston and an elastic member, the piston is arranged in the interior of the eliminator body, the side wall of the piston is in sliding sealing with the inner wall of the eliminator body, thereby the interior of the eliminator body is divided into a closed cavity and an open cavity, the elastic member is arranged in the closed cavity, one end of the elastic member is in abutment with the piston, and the other end of the elastic member is in abutment with the inner wall of the eliminator body.

3. The delivery line water hammer mitigation device of claim 2, wherein: The eliminator body is provided with a vent hole in communication with the closed cavity.

4. The delivery line water hammer mitigation device of claim 3, wherein: The eliminator body comprises a shell and a cover, the cover is tightly closed and covers the open end of the shell, the piston and the elastic member are respectively arranged in the interior of the shell, the vent hole is arranged at the top of the shell, and a connecting head is arranged at the bottom of the cover.

5. The delivery line water hammer mitigation device of claim 2, wherein: The side wall of the piston is provided with a first sealing ring.

6. The delivery line water hammer mitigation device of claim 4, wherein: The cover and the shell are connected by screw threads, and a sealing gasket is pressed and fixed therebetween.

7. The water hammer mitigation device of claim 4, wherein: The outer wall of the connecting head is provided with a sealing groove, and a second sealing ring is arranged in the sealing groove.

8. The water hammer mitigation device of claim 4, wherein: The top of the shell is provided with a pressure gauge.

9. The water hammer mitigation device of claim 2, wherein: The elastic member is a spring.

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