Water hammer arrestor

Abstract

The utility model relates to the field of fluid pipeline system discloses a water hammer elimination jar, including first chamber, first chamber is set up with the water inlet and outlet, second chamber is set up with pressure regulating mouth, and second chamber is used for accommodating positive pressure gas. The inlet and outlet passage is linked with first chamber and second chamber, and at least part inlet and outlet passage is formed into throttle section. The closing valve core is arranged in the inlet and outlet passage, when first chamber is filled with liquid, closes the inlet and outlet passage. The throttling device is arranged in the throttle section and can be telescopic along the axial direction of the inlet and outlet passage, when the closing valve core opens the inlet and outlet passage and the pressure in first chamber rises, the throttling device is elongated / contraction, to reduce the flow area of first inlet and outlet passage. The water hammer elimination jar can reduce the dissolution and consumption of gas, thereby avoiding the need to frequently supplement the air pressure in the water hammer elimination jar, the operation and maintenance cost are lower, and can prevent the water hammer of pressure rise.

Description

Technical Field

[0001] This utility model relates to the field of water pipeline technology, and in particular to a water hammer elimination tank. Background Technology

[0002] In water pipeline systems, when unexpected situations occur, such as a sudden stop of the delivery pump or a sudden closure of a valve in the pipeline, a transient state of rapid changes in fluid flow and pressure will occur. This phenomenon is called water hammer. When water hammer occurs, the rapid change in fluid flow in the pipe will cause the propagation of pressure waves, resulting in a rapid rise / fall in pressure within the pipe. In some cases, the pipeline may even collapse or be damaged due to the pressure waves.

[0003] To reduce or avoid losses caused by water hammer, water hammer protection devices such as water hammer elimination tanks or two-way pressure regulating towers are generally installed in the pump water delivery pipeline system. By supplying water to the pipeline to replenish pressure and absorbing water in the pipeline, the excessive pressure in the pipeline can be relieved, which can reduce the water hammer phenomenon caused by the rapid change of fluid flow in the pipeline.

[0004] Existing water hammer suppression tanks are typically pressure tanks with an elastic inner liner. They work by using pressurized compressed gas pre-filled between the inner liner and the tank body to compress the inner liner. When the external pipeline pressure is too high, the inner liner expands to absorb water; when the external pipeline pressure is low, the compressed gas compresses the inner liner to replenish water and pressurize the external pipeline, thus counteracting pressure fluctuations in the external pipeline. However, on the one hand, the inner liner needs to be made of an expensive, elastic pressure-bearing material, resulting in a high cost for the water hammer suppression tank. On the other hand, the inner liner is at risk of rupture and damage when absorbing excessive pressure in the pipeline, causing the water hammer suppression tank to fail in its protection of the pipeline.

[0005] In response, patent CN112066260B provides a pressure tank that divides the tank cavity into a first liquid chamber and a first gas chamber using a partition. The partition has through holes, and a first sealing element is used to either block or release the through holes. This pressure tank provides a tankless design to eliminate water hammer. However, in this structure, the first sealing element blocks the through holes as the liquid level rises. When filling the tank and pipelines with water, the liquid level in the first liquid chamber rises rapidly, easily causing water hammer and damaging the pressure tank. Furthermore, the sealing element may not respond quickly enough, leading to water entering the first gas chamber. Utility Model Content

[0006] This utility model provides a water hammer elimination tank, the purpose of which is to overcome the above-mentioned problems existing in the prior art.

[0007] To achieve this objective, the present invention adopts the following technical solution:

[0008] A water hammer elimination tank includes a first chamber, a second chamber, an inlet and outlet passage, a shut-off valve core, and a throttling device. The first chamber has an inlet and outlet, and the second chamber has a pressure regulating port; the second chamber is used to contain positive pressure gas. The inlet and outlet passage connects the first and second chambers, and at least a portion of the inlet and outlet passage forms a throttling section. The shut-off valve core is disposed in the inlet and outlet passage and closes the passage when the first chamber is filled with liquid. The throttling device is disposed in the throttling section and is axially expandable and contractible along the inlet and outlet passage. When the shut-off valve core opens the inlet and outlet passage and the pressure in the first chamber increases, the throttling device extends / contracts to reduce the flow area of ​​the first inlet and outlet passage.

[0009] According to the technical solution of this utility model, firstly, by filling the second chamber with pressurized gas, and by installing a shut-off valve core in the air intake and exhaust channel between the first and second chambers, the first and second chambers are connected when the first chamber is not filled with water, and the air intake and exhaust channel between the first and second chambers is closed when the first chamber is filled with water. At this time, the gas in the second chamber will not come into contact with the water in the first chamber during the normal operation of the water pipeline, which can reduce the dissolution and consumption of the gas, thereby avoiding the need to frequently replenish the gas pressure in the second chamber of the water hammer elimination tank, making the operation and maintenance cost of the water hammer elimination tank lower.

[0010] Furthermore, by forming a throttling section within the intake and exhaust channels, and utilizing a throttling device in conjunction with this section to alter the flow area of ​​the intake and exhaust channels, when the water hammer elimination tank is initially filled with water during operation and commissioning, or when the external water circuit experiences a pressure drop followed by a rise in the ejection water pressure, the liquid level in the first chamber rises. When the shut-off valve core opens the intake and exhaust channels and the pressure in the first chamber increases, the throttling device reduces the flow area of ​​the first intake and exhaust channels, thus slowing down the gas discharge rate from the first chamber. This prevents the liquid level in the first chamber from rising too quickly, preventing water hammer from occurring when the shut-off valve core closes the intake and exhaust channels. This provides a good water hammer impact protection for the water hammer elimination tank itself and a better buffering effect against pressurized water hammer. Additionally, because the liquid level rise rate in the first chamber is controlled to be relatively slow, the shut-off valve core can respond promptly to close the intake and exhaust channels when the first chamber is filled with water, reducing the risk of liquid from the first chamber entering the second chamber.

[0011] Finally, in cases where the liquid level in the first chamber rises rapidly, such as when the water circuit and water hammer elimination tank are filled with water, the pressure in the first chamber increases, causing the gas in the first chamber to be discharged slowly. This reduces the rate at which the liquid level rises in the first chamber, allowing for a timely response when the first chamber is filled with water. The valve core is then shut off to close the inlet and outlet channels, reducing the risk of liquid in the first chamber entering the second chamber.

[0012] As an optional technical solution, the throttling device includes an elastic telescopic mechanism and a movable valve disc. The elastic telescopic mechanism includes an elastic element and a guide rod. The guide rod is fixed within the intake and exhaust channels and arranged axially along the intake and exhaust channels. The elastic element is arranged around the outer periphery of the guide rod, and its first end is fixed to the end of the guide rod. The movable valve disc is disposed within the throttling section of the intake and exhaust channels, movably fitted onto the surface of the guide rod, and abuts against the second end of the elastic element.

[0013] According to the optional technical solution, the movable valve disc is located within the intake and exhaust channels, exhibiting significant fluid resistance. Therefore, when a pressure difference exists between the first and second chambers, the movable valve disc tends to move towards the side with lower pressure. Furthermore, the limiting mechanism of the elastic telescopic mechanism allows the movable valve disc to move within the throttling section as the gas flow pressure changes, thereby altering the flow area of ​​the intake and exhaust channels. This eliminates the need for additional sensors, controllers, or other communication equipment, resulting in lower costs and more sensitive control over pressure changes in external pipelines.

[0014] As an optional technical solution, the throttling section is a conical flow channel, and the inner diameter of the end of the conical flow channel facing the first chamber is larger than the inner diameter of the end of the conical flow channel facing the second chamber.

[0015] According to the optional technical solution, the movable valve disc is placed in the conical flow channel, and the gap between the outer edge of the movable valve disc and the inner surface of the conical flow channel forms a flow channel. When the movable valve disc moves axially in the conical flow channel, the flow area of ​​the gap between the outer edge of the movable valve disc and the inner surface of the conical flow channel changes.

[0016] As an optional technical solution, the throttling section includes a channel body and an annular perforated plate. The annular perforated plate is fixed to the inner wall of the channel body with a gap between it and the inner wall of the channel body, and the movable valve disc is disposed inside the annular perforated plate.

[0017] According to the optional technical solution, the movable valve disc is set in the annular hollow plate, which is divided into two areas by the movable valve disc: an upper and lower area, one area being the ventilation area and the other area being the adjustment area. The first chamber and the second chamber are connected through the ventilation area. When the movable valve disc moves axially in the conical flow channel, the ratio of the ventilation area to the adjustment area changes, thereby changing the area of ​​the ventilation area, that is, changing the flow area at that location.

[0018] As an optional technical solution, the gap between the movable valve disc and the throttling section is set.

[0019] According to the optional technical solution, the gap between the movable valve disc and the throttling section ensures that the throttling section still has a certain ventilation area even when the movable valve disc is completely closed. This prevents the movable valve disc from completely closing the inlet and outlet passages before the gas in the first chamber is completely discharged, thus avoiding premature blockage and water hammer. In addition, the gap between the movable valve disc and the throttling section prevents jamming caused by frictional resistance between the movable valve disc and the inner surface of the throttling section.

[0020] As an optional technical solution, the shut-off valve core includes a float and a shut-off valve disc, which are placed sequentially from top to bottom in the intake and exhaust channels along the direction of gravity. A switch valve seat is also fixed in the intake and exhaust channels, with a valve seat inlet in the middle. When the shut-off valve core closes the intake and exhaust channels, the valve seat inlet and the shut-off valve disc form a sealing pair.

[0021] According to the optional technical solution, the shut-off valve core can automatically respond and seal the air intake and exhaust channels as the liquid level rises, without the need for additional communication control, and has a fast response speed and low failure risk.

[0022] As an optional technical solution, the shut-off valve disc is provided with a micro-venting channel, and the float is located on the side of the micro-venting channel near the first chamber.

[0023] According to the optional technical solution, when a small amount of air accumulates in the first chamber, the liquid level drops slightly and the float falls. However, the shut-off valve disc is still pressed against the valve seat inlet by the pressure in the first chamber. Therefore, by providing a micro-venting channel in the shut-off valve disc, micro-venting can be maintained under these circumstances. Furthermore, by setting the float and the micro-venting channel in a corresponding manner, liquid can be further prevented from flowing into the second chamber through the micro-venting channel.

[0024] As an optional technical solution, the water hammer elimination tank also includes an overpressure relief structure, which is connected to the first chamber and the second chamber respectively.

[0025] According to the optional technical solution, the overpressure relief structure is connected to the first chamber and the second chamber respectively. When the pressure exceeds the safe pressure threshold, a part of the medium pressure can be released through the overpressure relief structure, which can improve the overall safety of the water hammer elimination tank.

[0026] As an optional technical solution, the water hammer elimination tank also includes a pressure regulating unit, which is connected to a pressure regulating port and is used to charge / release air into the second chamber to regulate the pressure in the second chamber.

[0027] According to the optional technical solution, the pressure regulating unit can fill or release air into the second chamber to keep the air pressure in the water hammer elimination tank stable at the pressure required for the working condition.

[0028] As an optional technical solution, the water hammer elimination tank includes a tank body, and the tank body is divided into a first chamber and a second chamber by a partition.

[0029] According to the optional technical solution, two independent chambers can be formed by using only one tank body, making the structure of the water hammer elimination tank more compact.

[0030] As an optional technical solution, the water hammer elimination tank includes a first tank and a second tank that are independently set up. The first tank has a first chamber inside, and the second tank has a second chamber inside. The first tank and the second tank are connected by an inlet and outlet pipe, and the inlet and outlet channel is set at the inlet and outlet pipe.

[0031] According to the optional technical solution, by setting up two independent pressure tanks, it is more suitable for scenarios that require the use of a larger volume water hammer elimination tank, and there is no need to weld partitions. The sealing and structural strength between the two chambers are also more reliable. Attached Figure Description

[0032] Figure 1 This is a schematic diagram of the structure of a water hammer elimination tank provided in an embodiment of the present invention;

[0033] Figure 2 and Figure 3 This refers to different scenarios in which the first chamber and the second chamber are located in two separate tanks in this utility model embodiment;

[0034] Figure 4 This is a schematic diagram of a specific throttling section and throttling device provided in the second embodiment of this utility model;

[0035] Figure 5 and Figure 6 These are schematic diagrams of two specific throttling sections and throttling devices provided in the third embodiment of this utility model.

[0036] Explanation of reference numerals in the attached figures:

[0037] 1. First chamber; 11. Inlet and outlet;

[0038] 2. Second chamber; 21. Pressure regulating port;

[0039] 3. Intake and exhaust channels; 31. Throttling section; 31a. Conical flow channel; 31b. Channel body; 31c. Annular perforated plate; 32. Switch valve seat;

[0040] 4. Shut-off valve core; 41. Float; 42. Shut-off valve disc; 43. Micro-venting channel;

[0041] 5. Throttling device; 51. Elastic telescopic mechanism; 511. Elastic element; 512. Guide rod; 52. Movable valve disc.

[0042] 6. Overpressure relief structure; 7. Baffle; 8. First tank; 9. Second tank. Detailed Implementation

[0043] The present invention will now be described in further detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present invention and not intended to limit it. Furthermore, it should be noted that, for ease of description, the accompanying drawings show only the parts relevant to the present invention, not the entire structure.

[0044] In the description of this utility model, unless otherwise explicitly specified and limited, the terms "connected," "linked," and "fixed" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0045] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0046] In the description of this embodiment, the terms "upper," "lower," "left," and "right," etc., refer to the orientation or positional relationship shown in the accompanying drawings. They are used only for ease of description and simplification of operation, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model. In addition, the terms "first" and "second" are only used for distinction in description and have no special meaning.

[0047] First Embodiment

[0048] Figure 1This utility model provides a water hammer elimination tank, comprising a first chamber 1, a second chamber 2, an inlet / outlet channel 3, a shut-off valve core 4, and a throttling device 5. The first chamber 1 has an inlet / outlet 11, and the second chamber 2 has a pressure regulating port 21. The second chamber 2 is used to contain positive pressure gas. The first chamber 1 and the second chamber 2 are connected via the inlet / outlet channel 3. The shut-off valve core 4 and the throttling device 5 are both located within the inlet / outlet channel 3. By controlling the flow area of ​​the inlet / outlet channel 3, or by controlling the opening and closing of the inlet / outlet channel 3, the gas flow between the first chamber 1 and the second chamber 2 can be adjusted.

[0049] The first chamber 1 has an inlet / outlet 11 connected to an external pipeline for replenishing liquid to the external pipeline or accommodating overpressurized liquid in the external pipeline. The inlet / outlet 11 can be located anywhere within the first chamber 1; to prevent splashing when water enters the chamber, it can be located at the bottom of the first chamber 1. The second chamber 2 has a pressure regulating port 21. The second chamber 2 can contain positive pressure gas. Positive pressure gas can be introduced into the second chamber 2 through the pressure regulating port 21, and gas can also be released through the pressure regulating port 21 to maintain stable gas pressure within the second chamber 2. Preferably, a pressure regulating unit can be connected to the outside of the second chamber 2. This pressure regulating unit can be a pressurizing mechanism, such as an air compressor, to pressurize the second chamber 2 when the gas pressure inside the second chamber 2 is insufficient.

[0050] It is important to note that Figure 1 The example illustrates a case where a single tank is divided by a partition 7 to form a first chamber 1 and a second chamber 2. This method allows for the creation of two independent chambers using only one tank. Furthermore, by creating openings in the partition 7, the air intake / exhaust channel 3, the shut-off valve core 4, and the throttling device 5 can be positioned at these openings, resulting in a more compact structure for the water hammer elimination tank. However, the invention is not limited to this. The first chamber 1 and the second chamber 2 can also be housed within independent tanks, and the position and connection method between the two tanks are not limited. For example, the two tanks can be arranged horizontally side-by-side, inclined, or vertically, all of which fall within the scope of protection of this invention.

[0051] Figure 2 and Figure 3 The illustrations show different scenarios where the first chamber 1 and the second chamber 2 are located in two separate tanks (first tank 8 and second tank 9). This arrangement is more suitable for scenarios requiring a larger volume of water hammer elimination tank, eliminates the need for welded partition 7, and improves the sealing and structural strength between the two chambers. An example is provided here where the first chamber 1 is located in tank 8 and the second chamber 2 is located in tank 9. Depending on the actual installation environment requirements, such as… Figure 2As shown, the first tank 8 and the second tank 9 can be arranged horizontally side by side, and the tops of the first tank 8 and the second tank 9 can be connected by a pressure pipe. The inlet and outlet passage 3, the shut-off valve core 4 and the throttling device 5 can be set at the pressure pipe.

[0052] Or, such as Figure 3 As shown, the first tank 8 and the second tank 9 can also be stacked along the direction of gravity. Specifically, the second tank 9 can be stacked on top of the first tank 8, and the top of the first tank 8 can be connected to any part of the second tank 9 through a pressure-bearing pipe. The figure shows an example of connecting the pressure-bearing pipe to the middle of the side of the second tank 9. In this way, the intake and exhaust channels 3, the shut-off valve core 4, and the throttling device 5 can be set on one side of the second tank 9, thereby making the upper and lower structures of the first tank 8 and the second tank 9 more compact and reducing the overall height of the device. In some other embodiments, the top of the first tank 8 and the bottom of the second tank 9 can also be connected, and the intake and exhaust channels 3, the shut-off valve core 4, and the throttling device 5 can be set between the upper and lower stacked first tank 8 and second tank 9, which can reduce the length of the pressure-bearing pipe and improve the overall pressure-bearing reliability of the device.

[0053] Furthermore, since the water hammer elimination tank is a pressure vessel containing a pressure medium, in order to improve safety, the water hammer elimination tank is also equipped with an overpressure relief structure 6. The overpressure relief structure 6 can be a safety valve or a water hammer relief valve. Considering that the water hammer elimination tank in this embodiment has two pressurized chambers (first chamber 1 and second chamber 2), two overpressure relief structures 6 can be set, and the two overpressure relief structures 6 can be respectively connected to the first chamber 1 and the second chamber 2, thereby improving the overall safety of the water hammer elimination tank.

[0054] Furthermore, the water hammer elimination tank also includes a shut-off valve core 4 disposed at the exhaust channel, which closes the exhaust channel when the first chamber 1 is filled with liquid. The specific structure of the shut-off valve core 4 is not limited here; any valve core capable of closing the exhaust channel when the first chamber 1 is filled with liquid is applicable to this invention. For example, in some embodiments, the shut-off valve core 4 can be a float. The gravity parameter of the float prevents the gas from causing it to float, while the rising liquid level causes the float to float and close the exhaust channel, thus enabling the exhaust channel to be closed when the first chamber 1 is filled with liquid. Alternatively, in other embodiments, the shut-off valve core 4 can include an electronic control valve and a liquid level sensor. When the liquid level sensor detects that the liquid level in the first chamber 1 has reached the top, the electronic control valve closes the exhaust channel. All of the above fall within the protection scope of this invention.

[0055] It is worth mentioning that in this embodiment, the intake and exhaust passage 3 connects the first chamber 1 and the second chamber 2, and at least a portion of the intake and exhaust passage 3 is formed as a throttling section 31. Correspondingly, a throttling device 5 is also provided in the throttling section 31. The throttling device 5 is provided in the throttling section 31 and can extend and retract along the axial direction of the intake and exhaust passage 3. When the shut-off valve core 4 opens the intake and exhaust passage 3 and the pressure in the first chamber 1 increases, the throttling device 5 extends / contracts to reduce the flow area of ​​the first intake and exhaust passage 3.

[0056] The structure of the throttling device 5 and the throttling section 31 is not limited here. The throttling device 5 only needs to have a valve disc that cooperates with the throttling section 31, and control the movement of the valve disc in the throttling section 31 to change the flow area of ​​the throttling section 31 accordingly. In some specific embodiments, the throttling device 5 may include an elastic telescopic mechanism 51 and a movable valve disc 52. The elastic telescopic mechanism 51 includes an elastic element 511 and a guide rod 512. The guide rod 512 is fixed in the intake and exhaust passage 3 and arranged along the axial direction of the intake and exhaust passage 3. The elastic element 511 is arranged around the outer periphery of the guide rod 512, and the first end of the elastic element 511 is fixed to the end of the guide rod 512. The movable valve disc 52 is arranged in the throttling section 31 of the intake and exhaust passage 3, and is movably fitted onto the surface of the guide rod 512 and abuts against the second end of the elastic element 511. The movable valve disc 52 is located within the intake and exhaust channels 3. Affected by fluid pressure, when there is a pressure difference between the first chamber 1 and the second chamber 2, the movable valve disc 52 tends to move towards the side with lower pressure. Furthermore, through the force of the elastic telescopic mechanism 51, the movable valve disc 52 can move within the throttling section 31 as the gas flow pressure changes, thereby altering the flow area of ​​the intake and exhaust channels 3. This eliminates the need for additional sensors, controllers, or other communication equipment, resulting in lower costs and more sensitive control over pressure changes in external pipelines.

[0057] In this embodiment, firstly, by filling the second chamber 2 with pressurized gas, and by installing a shut-off valve core 4 in the air intake and exhaust channel 3 between the first chamber 1 and the second chamber 2, the first chamber 1 and the second chamber 2 are connected when the first chamber 1 is not filled with water, and the air intake and exhaust channel 3 between the first chamber 1 and the second chamber 2 is closed when the first chamber 1 is filled with water. At this time, the gas in the second chamber 2 will not come into contact with the water in the first chamber 1 during the normal operation of the water pipeline, which can reduce the dissolution and consumption of the gas, thereby avoiding the need to frequently replenish the gas pressure in the second chamber 2 of the water hammer elimination tank, making the operation and maintenance cost of the water hammer elimination tank lower.

[0058] In addition, by forming a portion of the intake and exhaust passage 3 into a throttling section 31, and by using the throttling device 5 in conjunction with the throttling section 31 to change the flow area of ​​the intake and exhaust passage 3, when the water hammer elimination tank is initially filled with water during operation and commissioning, or when the external water circuit experiences a pressure drop followed by a rise in the launch water pressure, the liquid level in the first chamber 1 rises. At this time, the shut-off valve core 4 opens the intake and exhaust passage 3, and the pressure in the first chamber 1 rises. The throttling device 5 reduces the flow area of ​​the first intake and exhaust passage 3, thereby slowing down the gas discharge speed of the first chamber 1. This can prevent the liquid level in the first chamber 1 from rising too quickly and prevent the shut-off valve core 4 from generating a shut-off water hammer when closing the intake and exhaust passage 3. Thus, the water hammer elimination tank itself has a good water hammer impact effect and a better buffering effect against pressurized water hammer. In addition, since the rate of liquid level rise in the first chamber 1 is controlled to be relatively slow, the shut-off valve core 4 can respond in time to close the air intake and exhaust passage 3 when the first chamber 1 is filled with water, thereby reducing the risk of liquid in the first chamber 1 entering the second chamber 2.

[0059] Finally, in the case of a rapid rise in the liquid level in the first chamber 1, such as when the water circuit and water hammer elimination tank are filled with water, the pressure in the first chamber 1 rises rapidly, causing the gas in the first chamber 1 to be discharged slowly. This reduces the rate at which the liquid level rises in the first chamber 1, allowing for a timely response when the first chamber 1 is filled with water. The valve core 4 is then shut off to close the inlet and outlet passages 3, reducing the risk of liquid in the first chamber 1 entering the second chamber 2.

[0060] Second Embodiment

[0061] Compared to the first embodiment, the second embodiment of this utility model provides a more detailed structure of the throttling section 31 and the throttling device 5. Other undescribed structures are the same as in the first embodiment and will not be repeated here.

[0062] Figure 4 This is a schematic diagram of the structure of a specific throttling section 31 and throttling device 5 provided in the second embodiment of this utility model. Figure 4 As shown, the throttling section 31 can be formed as a tapered flow channel 31a, with the inner diameter of the end of the tapered flow channel 31a facing the first chamber 1 being larger than the inner diameter of the end of the tapered flow channel 31a facing the second chamber 2. The movable valve disc 52 is placed in the tapered flow channel 31a, and the gap between the outer edge of the movable valve disc 52 and the inner surface of the tapered flow channel 31a forms a flow channel. When the movable valve disc 52 moves axially in the tapered flow channel 31a, the flow area of ​​the gap between the outer edge of the movable valve disc 52 and the inner surface of the tapered flow channel 31a changes.

[0063] When the shut-off valve core 4 opens the intake and exhaust passage 3 and the pressure in the first chamber 1 increases, the gas in the first chamber pushes the movable valve disc 52 upward. The movable valve disc 52 moves towards the second chamber 2 along the central axis of the conical flow channel 31a. Preferably, the inner diameter of the end of the conical flow channel 31a facing the first chamber 1 can be set to be larger than the inner diameter of the end of the conical flow channel 31a facing the second chamber 2. When the movable valve disc 52 moves towards the second chamber 2, the gap area between the movable valve disc 52 and the inner surface of the conical flow channel 31a decreases, that is, the flow area of ​​the intake and exhaust passage 3 decreases.

[0064] Furthermore, the gap between the movable valve disc 52 and the inner wall at the minimum inner diameter of the conical flow channel 31a can be further configured. This gap ensures that even when the movable valve disc 52 is completely closed, the throttling section 31 still has a certain ventilation area. This prevents the movable valve disc 52 from completely closing the inlet and outlet channels 3 before the gas in the first chamber 1 is completely discharged, thus avoiding premature blockage and water hammer. Additionally, the gap between the movable valve disc 52 and the throttling section 31 prevents jamming due to frictional resistance between them.

[0065] Third Embodiment

[0066] Compared to the first embodiment, the third embodiment of this utility model provides a more detailed structure of the throttling section 31 and the throttling device 5. Other undescribed structures are the same as in the first embodiment and will not be repeated here.

[0067] Figure 5 and Figure 6 This is a schematic diagram of the structure of two specific throttling sections 31 and throttling devices 5 provided in the third embodiment of this utility model. (See attached diagram.) Figure 5 and 6 As shown, the throttling section 31 includes a channel body 31b and an annular perforated plate 31c. The annular perforated plate 31c is fixed to the inner wall of the channel body 31b and has a gap with it. A movable valve disc 52 is disposed within the annular perforated plate 31c. The movable valve disc 52 divides the annular perforated plate 31c into upper and lower regions: a ventilation region and a regulating region. The first chamber 1 and the second chamber 2 are connected via the ventilation region. When the movable valve disc 52 moves axially within the conical flow channel 31a, the ratio of the ventilation region to the regulating region changes, thereby altering the area of ​​the ventilation region, i.e., changing the flow area at that location.

[0068] To ensure rapid depressurization of the first chamber 1, the end of the annular perforated plate 31c facing the second chamber 2 can be sealed and fixed to the inner wall of the intake and exhaust channel 3. When the shut-off valve core 4 opens the intake and exhaust channel 3 and the pressure in the first chamber 1 increases, the gas in the first chamber pushes the movable valve disc 52 upward, and the movable valve disc 52 moves towards the second chamber 2, which reduces the ventilation area, i.e., reduces the flow area of ​​the intake and exhaust channel 3.

[0069] Optionally, the movable valve disc 52 can be spaced apart from the annular perforated plate 31c. This gap between the movable valve disc 52 and the throttling section 31 ensures that the throttling section 31 still has a certain ventilation area even when the movable valve disc 52 is completely closed. This prevents the movable valve disc 52 from completely closing the inlet and outlet passages 3 before the gas in the first chamber 1 is completely discharged, thus avoiding premature blockage and water hammer. Furthermore, the gap between the movable valve disc 52 and the throttling section 31 prevents jamming due to frictional resistance between them.

[0070] Fourth embodiment

[0071] Compared to the first embodiment, the fourth embodiment of this utility model provides a more detailed structure of the shut-off valve core 4. Other undescribed structures are the same as in the first embodiment and will not be repeated here.

[0072] The shut-off valve core 4 can be a float, a hemispherical valve disc, or a disc-shaped valve disc, which is not limited here. The shut-off valve disc 42 is set at the inlet and outlet passage 3. When the first chamber 1 is filled with water, the shut-off valve disc 42 closes the inlet and outlet passage 3. Preferably, the shut-off valve core 4 is a float. The shut-off valve core 4 can automatically respond and seal the inlet and outlet passage 3 as the liquid level rises, without the need for additional communication control, with fast response speed and low failure risk.

[0073] refer to Figure 4 and Figure 5 The shut-off valve core 4 may further include a float 41 and a shut-off valve disc 42, which are arranged sequentially from top to bottom in the intake and exhaust channels 3 along the direction of gravity. A switch valve seat 32 is also fixed in the intake and exhaust channels 3, with a valve seat inlet in the middle. When the shut-off valve core 4 closes the intake and exhaust channels 3, the valve seat inlet and the shut-off valve disc 42 form a sealing pair. Furthermore, the shut-off valve disc 42 is provided with a micro-exhaust channel 43, and the float 41 is located on the side of the micro-exhaust channel 43 near the first chamber 1.

[0074] When a small amount of air accumulates in the first chamber 1, the liquid level drops slightly, the float 41 falls, and the shut-off valve disc 42 is still pressed against the valve seat inlet by the pressure in the first chamber 1. Therefore, by providing a micro-venting channel 43 in the shut-off valve disc 42, a micro-venting can be maintained in this situation. Furthermore, by setting the float 41 in correspondence with the micro-venting channel 43, liquid can be further prevented from flowing into the second chamber 2 through the micro-venting channel 43.

[0075] Obviously, the above embodiments of this utility model are merely examples for clearly illustrating the present utility model, and are not intended to limit the implementation of the present utility model. Those skilled in the art can make various obvious changes, readjustments, and substitutions without departing from the protection scope of this utility model. It is neither necessary nor possible to exhaustively describe all embodiments here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this utility model should be included within the protection scope of the claims of this utility model.

Claims

1. A water hammer elimination tank, characterized in that, include: The first chamber (1) is provided with inlet and outlet water outlets (11); The second chamber (2) is provided with a pressure regulating port (21), and the second chamber (2) is used to contain positive pressure gas; An intake and exhaust passage (3) connects the first chamber (1) and the second chamber (2), and at least a portion of the intake and exhaust passage (3) is formed as a throttling section (31). The shut-off valve core (4) is installed in the air intake and exhaust passage (3) to close the air intake and exhaust passage (3) when the first chamber (1) is filled with liquid. A throttling device (5) is provided in the throttling section (31) and can extend and retract along the axial direction of the intake and exhaust passage (3). When the shut-off valve core (4) opens the intake and exhaust passage (3) and the pressure in the first chamber (1) increases, the throttling device (5) extends / contracts to reduce the flow area of ​​the intake and exhaust passage (3).

2. The water hammer elimination tank according to claim 1, characterized in that, The throttling device (5) includes: The elastic telescopic mechanism (51) includes an elastic element (511) and a guide rod (512). The guide rod (512) is fixed inside the intake and exhaust channel (3) and is arranged along the axial direction of the intake and exhaust channel (3). The elastic element (511) is arranged around the outer periphery of the guide rod (512). The first end of the elastic element (511) is fixed to the end of the guide rod (512). The movable valve disc (52) is disposed in the throttling section (31) of the intake and exhaust passage (3) and is movably fitted onto the surface of the guide rod (512) and abuts against the second end of the elastic member (511).

3. The water hammer elimination tank according to claim 2, characterized in that, The throttling section (31) includes: Main body of the channel (31b); An annular perforated plate (31c) is fixed to the inner wall of the channel body (31b) and is spaced apart from the inner wall of the channel body (31b). The movable valve disc (52) is disposed inside the annular perforated plate (31c).

4. The water hammer elimination tank according to claim 3, characterized in that, The movable valve disc (52) is spaced apart from the throttling section (31).

5. The water hammer elimination tank according to any one of claims 1-4, characterized in that, The shut-off valve core (4) includes a float (41) and a shut-off valve disc (42), and the shut-off valve disc (42) and the float (41) are placed in the intake and exhaust channels (3) from top to bottom along the direction of gravity; A switch valve seat (32) is also fixed in the intake and exhaust passage (3). A valve seat inlet is opened in the middle of the switch valve seat (32). When the shut-off valve core (4) closes the intake and exhaust passage (3), the valve seat inlet and the shut-off valve disc (42) form a sealing pair.

6. The water hammer elimination tank according to claim 5, characterized in that, The shut-off valve disc (42) is provided with a micro-venting channel (43), and the float (41) is located on the side of the micro-venting channel (43) near the first chamber (1).

7. The water hammer elimination tank according to any one of claims 1-4, characterized in that, It also includes an overpressure relief structure (6), which is connected to the first chamber (1) and the second chamber (2) respectively.

8. The water hammer elimination tank according to any one of claims 1-4, characterized in that, Also includes: The pressure regulating unit is connected to the pressure regulating port (21) and is used to fill / release air into the second chamber (2) to regulate the pressure in the second chamber (2).

9. The water hammer elimination tank according to any one of claims 1-4, characterized in that, It includes a tank body, which is divided by a partition (7) to form a first chamber (1) and a second chamber (2).

10. The water hammer elimination tank according to any one of claims 1-4, characterized in that, It includes a first tank (8) and a second tank (9) that are set independently. The first tank (8) has a first chamber (1) inside, and the second tank (9) has a second chamber (2) inside. The first tank (8) and the second tank (9) are connected by an air intake and exhaust pipe, and the air intake and exhaust channel (3) is set at the air intake and exhaust pipe.

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