CN216689588U - Connecting pipe structure for reducing volume of air tank - Google Patents

Abstract

The utility model discloses a connecting pipe structure for reducing the volume of an air tank, which comprises a water supply pipeline and the air tank, wherein the water supply pipeline is arranged below the air tank, the air tank is arranged above the water supply pipeline, the water supply pipeline and the air tank are communicated through a connecting pipe, the connecting pipe is provided with an eccentric half ball valve for cutting off the hydraulic connection between the air tank and the water supply pipeline when the air tank is overhauled, a check valve is arranged between the eccentric half ball valve and the air tank, the action direction of the check valve is opened when the air tank supplies water to the water supply pipeline, and a valve plate of the check valve is provided with a plurality of orifices. When the water pump accident outage, the check valve is opened and is supplemented water in the water supply pipeline, and during the water body backward flow in the water supply pipeline, when pressure in the water supply pipeline is slightly greater than the air tank water pressure, the check valve is closed, and the backward flow water body passes through the orifice and gets into the air tank, because the orifice fault area is less, makes the water body that gets into in the air tank less, thereby reaches the purpose that reduces the air tank volume.

Description

Connecting pipe structure for reducing volume of air tank

Technical Field

The utility model relates to the technical field of hydraulic and hydroelectric engineering, in particular to a connecting pipe structure for reducing the volume of an air tank.

Background

Diversion project is the most direct and effective way to solve the problem of uneven space-time distribution of water resources, and is the main way to supply water to water-deficient cities and regions in all countries of the world. The water supply pipeline can change the flow rate in the pipeline during the power-off closing process of the water pump, so that the pressure of the water supply pipeline changes, and the transition of the pressure in the pipeline changing along with the change of the flow rate is called a hydraulic transition process. The water hammer is a common physical phenomenon in a water delivery device and is very harmful to the safe and stable operation of a pipe network, and pipe explosion accidents happen occasionally due to improper setting of water hammer protection technical measures.

In order to ensure the safe operation of the water pump of the water diversion and adjustment engineering with long-distance pressure water delivery and the water outlet pipeline behind the pump or the tunnel structure, various types of water attack protection facilities are generally required to be arranged on the water delivery pipeline. The air tank has the characteristics that the minimum water hammer pressure can be prevented from being lowered too low, the maximum water hammer pressure can be prevented from being increased too much, and the water hammer protection reliability is high, the air tank can be arranged in a pump room or in the air next to the pump room, water-vapor separation is realized for the air tank adopting a liner type, the air supplementing frequency of the air tank reaches once a year or even longer, the daily maintenance and overhaul are very convenient, therefore, the air tank is applied to the diversion project more and more, and particularly, the air tank can be preferably selected as a first-selected water hammer protection measure for the diversion project with high water supply guarantee rate.

But the initial gas volume in traditional air tank is great, and directly links to each other with the connecting pipe directly and cause the installation volume of air tank great, and engineering cost is higher, also is not favorable to arranging in the pump house. Meanwhile, the change of the internal water pressure in the water supply pipeline shows obvious difference along with the arrangement difference of the water supply pipeline, and the traditional air tank cannot be well adapted to the characteristic, so that the popularization and the use of the air tank are further limited. If the volume of the air tank can be reduced without reducing its water hammer prevention effect, construction costs can be reduced and the air tank can be used in more water supply works.

Disclosure of Invention

The utility model aims to provide a connecting pipe structure for reducing the volume of an air tank, which is based on the difference between the negative pressure wave reduction amplitude and the positive pressure wave amplification of a water supply pipeline in long-distance water diversion engineering water supply, adopts an arrangement structure with the water flow impedance difference of an air inlet tank and an air outlet tank, reduces the volume of the air tank on the premise of not reducing the water hammer protection effect, reduces the engineering cost and can ensure that the air tank can be applied to more water supply engineering.

The technical scheme adopted by the utility model for solving the technical problems is as follows: the utility model provides a reduce volumetric connecting pipe structure of air tank, including water supply pipe and air tank, water supply pipe is under, the air tank is last, through the connecting pipe intercommunication between water supply pipe lateral wall and the air tank, the connecting pipe sets up the eccentric half ball valve that is used for cutting off air tank and water supply pipe hydraulic connection when the air tank overhauls, be equipped with the check valve between eccentric half ball valve and the air tank, the check valve direction of action is opened for the air tank when supplying water toward water supply pipe, the check valve plate is equipped with a plurality of orifice.

Preferably, the cross-sectional area of the connecting pipe is 25% -35% of the cross-sectional area of the water supply pipeline.

Preferably, the diameter of each orifice is 5cm, and the total area of the orifices is 15% of the cross-sectional area of the connecting pipe.

Preferably, the overflowing diameter of the eccentric half-ball valve is not smaller than that of the connecting pipe.

The working process of the utility model is as follows: when the system normally works, the eccentric half ball valve for overhauling is in a full-open state, and the head loss is almost 0. When the water pump is in power failure due to accident, the check valve is opened to supply water into the water supply pipeline. During the water body backward flow in the water supply pipeline, when the pressure in the water supply pipeline is slightly greater than the air tank water body pressure, the check valve is closed, and the backward flow water body passes through the orifice and gets into the air tank, because the orifice cross-sectional area is less for the water body that gets into in the air tank is less, thereby reaches the purpose that reduces the air tank volume.

The utility model has the beneficial effects that:

1. when the water pump accident outage, the check valve is opened and is supplemented water in the water supply pipeline, and during the water body backward flow in the water supply pipeline, when pressure in the water supply pipeline is slightly greater than the air tank water pressure, the check valve is closed, and the backward flow water body passes through the orifice and gets into the air tank, because the orifice fault area is less, makes the water body that gets into in the air tank less, thereby reaches the purpose that reduces the air tank volume.

2. The utility model has convenient construction, and is particularly flexible in arrangement for water supply engineering with obvious difference between the amplitude reduction of negative pressure waves of pipelines and the amplitude increase of positive pressure waves of pipelines.

3. The volume of the air tank is reduced, the manufacturing cost of the air tank is reduced, and meanwhile, the peak clipping effect is obvious, the structure is simple, and the engineering benefit is obvious.

Drawings

FIG. 1 is a schematic view of the present invention.

Fig. 2 is a partially enlarged view of a in fig. 1.

Fig. 3 is a schematic structural view of a check valve plate.

The labels in the figure are: 1. a water supply pipeline; 2. an air tank; 3. a connecting pipe; 4. overhauling the eccentric half-ball valve; 5. a check valve; 6. a check valve plate; 7. an orifice.

Detailed Description

The present invention will be further described with reference to the structures or terms used herein. The description is given for the sake of example only, to illustrate how the utility model may be implemented, and does not constitute any limitation on the utility model.

The air tank connecting structure of the diversion and regulation engineering device with the characteristic that the reduction amplitude of the negative pressure wave of the pipeline is larger than the increase amplitude of the positive pressure wave of the pipeline is taken as an example for explanation.

As shown in fig. 1-3, this embodiment is a connecting pipe structure for reducing the volume of an air tank, including a water supply pipe 1 and an air tank 2, the water supply pipe 1 is located below, the air tank 2 is located above, the side wall of the water supply pipe 1 is communicated with the air tank 2 through a connecting pipe 3, the connecting pipe 3 is provided with an eccentric half ball valve 4 for cutting off the hydraulic connection between the air tank and the water supply pipe 1 when the air tank is overhauled, a check valve 5 is arranged between the eccentric half ball valve 4 and the air tank 2, the check valve 5 is opened when the air tank 2 supplies water to the water supply pipe 1, and a valve plate 6 of the check valve is provided with a plurality of orifices 7.

The basic working principle of the embodiment is as follows: when the system works normally, the eccentric half ball valve 4 for overhauling is in a full-open state, and the head loss is almost 0. When the water pump outage is shut down, its water supply pipe 1 produces the negative pressure wave because of the rapid decline of flow, and when 5 downside pressures of check valve were less than upside pressure, check valve 5 opened "moisturizing" in to water supply pipe 1, slowed down the speed that the flow descends, reduced the falling amplitude of negative pressure wave to the minimum negative pressure in the water supply pipe 1 has been improved. When the positive pressure wave is transmitted to the check valve 5, the pressure rises, and when the pressure in the water supply pipeline 1 is higher than the pressure in the tank, the check valve 5 is closed because water flows into the air tank 2. At this time, part of the flow can enter the air tank 2 through the orifice 7 on the check valve 5, and can play a role of secondary peak clipping while reflecting the water hammer wave, so that not only can the increase of the positive pressure wave be reduced, but also the arrangement of the check valve 5 and the orifice 7 can accelerate the attenuation of the water hammer pressure due to the periodicity of the water hammer pressure, reduce the cycle working frequency of the air tank 2 and prolong the overhaul period of the air tank, and simultaneously, the water body entering the air tank 2 is smaller due to the smaller cross-sectional area of the orifice 7, thereby achieving the purpose of reducing the volume of the air tank 2.

The connecting pipe 3 has the functions of supplementing and draining water for the water supply pipeline 1 on one hand and can be used as an impedance hole to primarily reduce the water hammer pressure on the other hand.

The check valve 5 is operated in a direction that the air tank 2 is opened when supplying water to the water supply pipeline 1, opened when the pressure in the water supply pipeline 1 is lower than the pressure in the tank, and closed when the pressure in the water supply pipeline 1 is higher than the pressure in the tank.

As a specific example, the aperture of each orifice 7 is 5cm, the total area of the orifices 7 is about 15% of the cross-sectional area of the connecting pipe 3, and the purpose of reducing the maximum water hammer pressure of the water supply pipeline 1 can be achieved by entering the air tank 2 through the orifices 7 when the positive pressure of the water supply pipeline reaches the air tank 2. In addition, the arrangement of the throttling hole 7 can ensure that the water supply pipeline 1 automatically supplies water to the air tank 2 through the throttling hole 7 when the water supply pipeline 1 normally operates, and the air tank 2 automatically starts to operate.

As a specific embodiment, the air tank 2 and the check valve 5 can be overhauled or replaced by closing the eccentric half ball valve 4, and the overflowing diameter of the eccentric half ball valve 4 is not smaller than that of the connecting pipe 3.

Compared with the water diversion and regulation project which takes the pipeline negative pressure wave amplitude reduction smaller than the pipeline positive pressure wave amplitude as the hydraulic characteristic, the water diversion and regulation project which takes the pipeline negative pressure wave amplitude reduction larger than the pipeline positive pressure wave amplitude as the hydraulic characteristic only needs to reversely arrange the check valve 5, namely the check valve is opened when the water pressure in the water supply pipeline is larger than the pressure in the air tank. Other arrangements are identical and will not be described in detail herein.

The embodiments of the present invention are described in detail above with reference to the drawings, but the present invention is not limited to the described embodiments. It will be appreciated by those skilled in the art that various changes, modifications, substitutions and alterations can be made in the embodiments without departing from the spirit and scope of the utility model.

Claims (4)

1. The utility model provides a reduce volumetric connecting pipe structure of air tank, including water supply pipe and air tank, a serial communication port, water supply pipe is under, the air tank is last, through the connecting pipe intercommunication between water supply pipe lateral wall and the air tank, the connecting pipe sets up the eccentric half ball valve that is used for cutting off air tank and water supply pipe hydraulic connection when the air tank overhauls, be equipped with the check valve between eccentric half ball valve and the air tank, the check valve direction of action is opened for the air tank when supplying water toward water supply pipe, the check valve plate is equipped with a plurality of orifice.

2. The structure of a connection pipe for reducing the volume of an air tank as claimed in claim 1, wherein the sectional area of the connection pipe is 25% to 35% of the sectional area of a water supply pipeline.

3. A connecting pipe structure for reducing the volume of an air tank as set forth in claim 1, wherein the diameter of each orifice is 5cm, and the total area of the orifices is 15% of the cross-sectional area of the connecting pipe.

4. The structure of a connection pipe for reducing the volume of an air tank as claimed in claim 1, wherein the flow passing diameter of the eccentric half ball valve is not less than the flow passing diameter of the connection pipe.

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