CN215982026U - Water hammer protection device for long-distance heat supply pipe network - Google Patents

Abstract

The utility model relates to the technical field of long-distance heat supply, in particular to a water hammer protection device for a long-distance heat supply pipe network, wherein a flat plate base and a flat plate base a are respectively welded on the top surfaces of elbows at two ends of a corner pipe section of a square compensator, and the flat plate base a are welded with two ports of an externally-connected inverted U-shaped corner pipe section; the utility model utilizes the special structure of the long-distance pipeline network to achieve dynamic pressure reduction and prevent the occurrence of water hammer, and once the water hammer occurs, the pressure is quickly released to avoid the damage and propagation of the water hammer.

Description

Water hammer protection device for long-distance heat supply pipe network

Technical Field

The utility model relates to the technical field of long-distance heat supply, in particular to a water hammer protection device for a long-distance heat supply pipe network.

Background

The water hammer is also called water hammer, and refers to a hydraulic transient process of pressure alternation caused by the sharp change of liquid flow velocity in a pressure pipeline; for urban long-distance heat supply pipe transportation, two water hammer phenomena exist, namely, water hammer caused by suddenly cutting off a water flow passage, such as rapidly closing a valve in an accident; the other is a cut-off closing water hammer, also called a burst water hammer, which is mainly generated when water is recovered into liquid after being largely vaporized, and after the water hammer is generated, a high-pressure mechanical wave is formed, and is transmitted, reflected and superposed in a pipeline at a speed close to the sound velocity, and the pressure change which is sharply increased causes damage to the pipeline, so that many technicians begin to research the protection technology of the water hammer.

For example, chinese patent document CN 201720072161.0 discloses a long-distance high-lift large-diameter pipeline water delivery system with a water hammer eliminating function, which comprises a water hammer eliminating pipeline, a water delivery pipeline, a T-shaped pipeline, a production water outlet tank and a production water inlet tank, wherein the production water inlet tank is respectively connected with the water hammer eliminating pipeline and the water delivery pipeline, the T-shaped pipeline has three branch pipelines, a first branch pipeline is connected with the water delivery pipeline, a second branch pipeline is connected with the water hammer eliminating pipeline, a third branch pipeline is connected with a production water tank, a water hammer preventing valve, a manual ball valve and a pressure transmitter are sequentially installed on the water hammer eliminating pipeline from the production water inlet tank to the production water tank, an electric butterfly valve, a centrifugal pump, an electric pump control valve and an electric hydraulic ball valve are sequentially installed on the water delivery pipeline from the production water inlet tank to the production water tank, the water hammer eliminating pipeline of the centrifugal pump is lapped with the water hammer eliminating pipeline to prevent and eliminate the water hammer, the whole system can run safely and stably.

For another example, chinese patent document CN 201921483766.4 discloses a long-distance water pipe line water hammer eliminating device, which includes a valve barrel and a top cover, the top cover is installed on the upper end of the valve barrel, the bottom circumference outer wall of the top cover and the top circumference outer wall of the valve barrel are both sleeved with connecting rings, two the connecting rings pass through nut fixed connection, a valve body reinforcing device is added on the air valve of the long-distance water pipe line water hammer eliminating device, and the bottom of the novel valve body reinforcing device is fixed on the top cover, and the novel valve body reinforcing device can play a reinforcing role in the air valve after being installed, and the normal installation of the air valve on the connecting head fixed on the top cover can not be affected, and the air valve can be more firmly connected with the connecting head on the top cover by increasing the novel valve body reinforcing device, so that the air valve and the air valve can be caused by strong air pressure when the whole long-distance water pipe line water hammer eliminating device is used The loose condition is generated at the connecting head.

For another example, chinese patent document CN202010816766.2 discloses a valve for preventing a hammer effect, which includes a valve body, a valve core, a trip lever, and a buffer mechanism. The valve body extends along the horizontal direction, the valve core is arranged in the channel, the pulling rod is arranged on the valve core and penetrates through the valve body so as to drive the valve core to rotate in the valve body when the valve core rotates under stress, and then the valve body is opened or closed. The buffer mechanism comprises a main shaft, a limited slip bulge, a plurality of water baffles, a limited sliding groove and a water baffle return device. A plurality of gear rolling grooves are formed in the side wall of the main shaft, a rack is fixedly mounted on one side wall of each gear rolling groove, and the slip limiting protrusions are arranged on the surfaces of the meshing teeth of the racks. A plurality of breakwaters are perpendicular to the main shaft and evenly distributed along the circumference of main shaft, and the gear is installed to the inboard friction of breakwater, and the gear meshes with the rack, and the limit slide groove sets up in the surface of gear, and the limit is slided in the arch inserts the limit slide groove to hinder the gear for the rack along the width direction removal of rack. The reliability of the valve for preventing the water hammer effect is improved, and the structure is compact. The basic idea of the water hammer protection technology disclosed above is to reduce pressure or relieve pressure, which is widely and widely adopted in practical applications.

The water hammer protection technology is a short-distance pipe network, and the reason that the long-distance heat supply pipe network generates the water hammer is that not only the valve is closed by mistake and the heat supply system is easy to vaporize when the working temperature is high, but also the problem of low-pressure vaporization of the water in the heat supply network is most concerned. Because collapsing the water hammer may result in an instantaneous pressure of 5MPa to 10MPa, or even higher. In addition, for long-distance heat supply pipelines, height difference exists, and due to large topographic height difference, pressure bearing at each position of the pipe network is different, and pressure bearing of a low-position pipe network is large. When the working pressure of the system is high, the pipeline strength is usually small in reserve and is easy to damage. Therefore, for long-distance heat supply pipelines, accidents such as dynamic hydraulic impact of water hammer and the like are easy to happen, high attention is paid to dynamic hydraulic analysis, and corresponding measures are taken to improve the reliability of a long-distance heat supply and delivery system.

Disclosure of Invention

Aiming at the defects, the utility model aims to achieve dynamic pressure reduction by utilizing the special structure of the long-distance pipeline network and prevent the water hammer phenomenon; and the problem that once the water hammer occurs, the pressure is quickly released to avoid the damage and the propagation of the water hammer is solved.

In order to achieve the purpose, the utility model provides the following technical scheme:

a water hammer guard for a long haul heating network, comprising: the top surfaces of elbows at two ends of a corner pipe section (5) of the square compensator (1) are respectively welded with a flat base (2) and a flat base a (8), and the flat base (2) and the flat base a (8) are welded with two ports of an external inverted U-shaped corner pipe section (6).

The technical scheme of the utility model is further improved as follows: and a round hole (10) is formed in the body of the flat base (2) and the flat base a (8) in a penetrating manner.

The technical scheme of the utility model is further improved as follows: dull and stereotyped base (2) adaptation installation pressure release top cap (3), pressure release top cap (3) upper surface connection spring (4) one end, spring (4) other end are fixed at external inverted U-shaped corner pipe section (6) inner wall.

The technical scheme of the utility model is further improved as follows: the pressure adjusting block (9) is installed on the flat base a (8) in a matched mode, the upper surface of the pressure adjusting block (9) is connected with the spring a (7), and the extending section of the spring a (7) penetrates through a round hole (10) of the flat base a (8) to be connected with the inner wall of the externally-connected inverted U-shaped corner pipe section (6).

The technical scheme of the utility model is further improved as follows: the flat base (2) is integrally formed, the middle part of the flat base is convex, a round hole (10) formed in the flat base is located in the middle of the convex, and at least two circular rings (12) are arranged on the outer surface of the convex.

The technical scheme of the utility model is further improved as follows: pressure release top cap (3) are the shape of falling U, and its pressure release top cap inner wall top sets up ring (12), and ring (12) support pastes in the convex top in flat base (2) middle part.

The technical scheme of the utility model is further improved as follows: the flat base a (8) and the pressure adjusting block (9) are respectively provided with at least one circular ring (12), and the circular ring (12) of the pressure adjusting block (9) is close to the circular hole (10).

The technical scheme of the utility model is further improved as follows: the diameter of the flat base (2) and the flat base a (8) abuts against the inner wall of the externally-connected inverted U-shaped corner pipe section (6).

The technical scheme of the utility model is further improved as follows: the ring (12) is internally provided with a rubber ring sleeve (11).

The technical scheme of the utility model is further improved as follows: the spring (4) is the same as the spring a (7) and the connection direction is vertical.

Compared with the prior art, the water hammer protection device for the long-distance heat supply pipe network has the following beneficial effects:

1. the utility model provides a water hammer protection device for a long-distance heat supply pipe network, which is characterized in that a pressure relief top cover is connected with a spring with pretightening force, and the pressure relief top cover is downwards buckled on a flat base and is provided with a circular ring installation rubber ring sleeve for sealing; the pressure regulating block is connected with the spring with pretightening force and used for checking accumulated water and changing the waveform of water hammer propagation, and the pressure relief is quick in the operation of a heat supply network system, so that the influence of the water hammer on the system is reduced, the damage of the water hammer is avoided, and the pressure regulating block is simple to install, convenient to construct and easy to operate.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.

Fig. 1 is a schematic structural view of a water hammer protection device for a long-distance heat supply pipe network.

Fig. 2 is a partially enlarged schematic structural view of the flat base and the pressure relief cover in fig. 1.

Fig. 3 is a partially enlarged structural schematic diagram of the flat base a and the pressure adjusting block in fig. 1.

Reference numbers in the figures: 1-a square compensator; 2-a flat bed base; 3-pressure relief top cover; 4-a spring; 5-corner pipe section; 6-externally connecting an inverted U-shaped corner pipe section; 7-spring a; 8-plate base a; 9-a pressure regulating block; 10-a circular hole; 11-rubber ferrule; 12-circular ring.

Detailed Description

The technical solution of the present invention will be clearly and completely described by the following detailed description. It is to be understood that the described embodiments are merely exemplary of the utility model, and not restrictive of the full scope of the utility model. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

As shown in figures 1-3, the utility model welds two ports of an external inverted U-shaped corner pipe section (6) on the top surfaces of elbows at two ends of a corner pipe section (5) of a square compensator (1), because the elbow of the square compensator (1) is stressed greatly and cannot adopt conventional welding treatment, the top surfaces of the elbows at two ends of the square compensator (1) are cut and respectively welded with an upper flat base (2) and a flat base a (8); preferably, the diameter of the flat base (2) and the flat base a (8) abuts against the inner wall of the externally-connected inverted U-shaped corner pipe section (6). A round hole (10) is formed in the body of the flat base (2) on one side of the heat supply fluid inlet in a penetrating mode, the flat base (2) is installed with a pressure relief top cover (3) in a matching mode, the upper surface of the pressure relief top cover (3) is connected with one end of a spring (4), and the other end of the spring (4) is fixed to the inner wall of an externally-connected inverted U-shaped corner pipe section (6); a round hole (10) is formed in a body of a flat base (8) on one side of a heat supply fluid outlet in a penetrating mode, a pressure adjusting block (9) is installed on the flat base a (8) in a matching mode, the upper surface of the pressure adjusting block (9) is connected with a spring a (7), and an extension section of the spring a (7) penetrates through the round hole (10) of the flat base a (8) to be connected with the inner wall of an external inverted U-shaped corner pipe section (6). When heat supply fluid enters the square compensator (1), and the fluid moves upwards, the direction of the fluid is exactly aligned with the direction of the spring (4) fixed on the pressure relief top cover (3), and when the square compensator (1) absorbs cold and heat deformation of the pipeline in the axial direction, the transverse direction and the angular direction, the stress can still be kept aligned, so that the accurate setting of the pretightening force of the spring is solved. The design pressure of a general heat supply hot water medium is less than or equal to 2.5Mpa, the design temperature is less than or equal to 200 ℃, the temperature of a long-distance hot water heat supply system is generally less than or equal to 150 ℃, the directions of heat supply fluid and a spring (4) of a pressure relief top cover (3) are consistent, and the decomposition of the pressure in other directions is avoided, so that the pre-tightening force of the spring (4) is set to be 1.6-3 times of the design pressure of a heat supply pipeline, namely 4-7.5 Mpa, and the pressure is set to ensure that the heat supply fluid cannot enter an externally-connected inverted U-shaped corner pipe section (6) through the pressure relief top cover (3) in normal operation; on the other hand, the pressure relief top cover (3) is prevented from frequently moving, when the pipeline pressure is high, the pressure relief top cover (3) can be frequently opened by the heat supply fluid, so that a part of the heat supply fluid enters the external inverted U-shaped corner pipe section (6), and the heat supply fluid does not enter the external inverted U-shaped corner pipe section (6) in the normal operation process.

As shown in figure 2, the middle of the flat plate base (2) is convex and integrally formed, a round hole (10) formed in the middle of the flat plate base is located in the convex middle, at least two circular rings (12) are arranged on the outer surface of the convex for sealing, the pressure relief top cover (3) is inverted U-shaped, the circular rings (12) are arranged above the inner wall of the pressure relief top cover, the circular rings (12) abut against the convex upper portion of the middle of the flat plate base (2), rubber ferrules (11) are arranged in the circular rings (12) in a matched mode, and fluid is further prevented from entering the external inverted U-shaped corner pipe section (6) through radial and transverse sealing. When a water hammer occurs, the pressure of the pipeline can be increased rapidly and even exceeds dozens of times of normal pressure, once the pressure exceeds 2 times of the set pressure, the pressure relief top cover (3) moves upwards, and a part of heat supply fluid enters the externally connected inverted U-shaped corner pipe section (6) so as to achieve the purpose of pressure relief.

When the heating system normally operates, heating fluid is decompressed by each corner pipe section in the inverted U shape of the direction compensator (1) in sequence, and the fluid cannot enter the externally connected inverted U-shaped corner pipe section (6); when a water hammer occurs, a large amount of heating fluid enters the externally connected inverted U-shaped corner pipe section (6), the pressure of the externally connected inverted U-shaped corner pipe section (6) also rises sharply at the moment, the entering heating fluid needs to be checked in time, when the pressure in the externally connected inverted U-shaped corner pipe section (6) is higher than the pre-tightening force of the spring a (7), the pressure adjusting block (9) runs downwards, because the water hammer enters the externally connected inverted U-shaped corner pipe section (6) under the condition of the highest pressure point, the pressure in the externally connected inverted U-shaped corner pipe section (6) is higher than the highest pressure of the water hammer as more and more heating fluid enters the externally connected inverted U-shaped corner pipe section (6), the pressure is transmitted in the form of pressure waves as the pressure of the water hammer is a wave form, when the pressure in the externally connected inverted U-shaped corner pipe section (6) is higher than the pre-tightening force of the spring a (7), the pressure adjusting block (9) runs downwards at an uneven speed, this is due to the fact that the open spaces are not of uniform size, which results in a pressure that also varies with time, but this varying waveform is different from the waveform of a normal operation of the water hammer. After pressure regulating block (9) opened, the partial fluid direction of the pressure regulating block (9) that the heating fluid flows out is just opposite with the direction of water hammer, and two strands of fluid mix, and opposite direction, the wave form is different, subducts the highest pressure of water hammer to reduce the destructive power of water hammer, also reduced water hammer propagation velocity simultaneously, thereby the safety of guarantee heat supply pipe network.

As shown in figure 3, when the heating system normally works, heating fluid does not enter the external inverted U-shaped corner pipe section (6), at least one circular ring (12) is respectively arranged on the flat base a (8) and the pressure adjusting block (9), the position of the circular ring (12) of the pressure adjusting block (9) is close to the circular hole (10), the circular ring (12) is internally matched with the rubber ring sleeve (11) for sealing, and meanwhile, in order to rapidly check the fluid of the external inverted U-shaped corner pipe section (6), the pretightening force of the spring a (7) is set to be 0.40.4-1 times of the design pressure of the heating pipeline, namely 1-2.5 MPa. The above-mentioned embodiments are merely illustrative of the preferred embodiments of the present invention, and do not limit the scope of the present invention, and various modifications and improvements of the technical solution of the present invention by those skilled in the art without departing from the spirit of the present invention should fall within the protection scope defined by the appended claims.

Claims (10)

1. A water hammer protector for long distance heating pipe network, its characterized in that includes: the top surfaces of elbows at two ends of a corner pipe section (5) of the square compensator (1) are respectively welded with a flat base (2) and a flat base a (8), and the flat base (2) and the flat base a (8) are welded with two ports of an external inverted U-shaped corner pipe section (6).

2. The water hammer prevention device for a long distance heating pipe network of claim 1, wherein: and a round hole (10) is formed in the body of the flat base (2) and the flat base a (8) in a penetrating manner.

3. The water hammer prevention device for a long distance heating pipe network of claim 1, wherein: dull and stereotyped base (2) adaptation installation pressure release top cap (3), pressure release top cap (3) upper surface connection spring (4) one end, spring (4) other end are fixed at external inverted U-shaped corner pipe section (6) inner wall.

4. The water hammer prevention device for a long distance heating pipe network of claim 1, wherein: the pressure adjusting block (9) is installed on the flat base a (8) in a matched mode, the upper surface of the pressure adjusting block (9) is connected with the spring a (7), and the extending section of the spring a (7) penetrates through a round hole (10) of the flat base a (8) to be connected with the inner wall of the externally-connected inverted U-shaped corner pipe section (6).

5. The water hammer prevention device for a long distance heating pipe network of claim 1, wherein: the flat base (2) is integrally formed, the middle part of the flat base is convex, a round hole (10) formed in the flat base is located in the middle of the convex, and at least two circular rings (12) are arranged on the outer surface of the convex.

6. The water hammer prevention device for a long distance heating pipe network of claim 3, wherein: pressure release top cap (3) are the shape of falling U, and its pressure release top cap inner wall top sets up ring (12), and ring (12) support pastes in the convex top in flat base (2) middle part.

7. The water hammer prevention device for a long distance heating pipe network of claim 4, wherein: the flat base a (8) and the pressure adjusting block (9) are respectively provided with at least one circular ring (12), and the circular ring (12) of the pressure adjusting block (9) is close to the circular hole (10).

8. The water hammer prevention device for a long distance heating pipe network of claim 1, wherein: the diameter of the flat base (2) and the flat base a (8) abuts against the inner wall of the externally-connected inverted U-shaped corner pipe section (6).

9. The water hammer prevention device for a long distance heating pipe network of claim 5, wherein: the ring (12) is internally provided with a rubber ring sleeve (11).

10. The water hammer prevention device for a long distance heating pipe network of claim 4, wherein: the spring (4) is the same as the spring a (7) and the connection direction is vertical.

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