Water hammer eliminating tank

Abstract

The invention relates to the field of fluid pipeline systems, and discloses a water hammer eliminating tank which comprises a first cavity, a water inlet and a water outlet are formed in the first cavity, a pressure regulating opening is formed in a second cavity, and the second cavity is used for containing positive pressure gas. The air inlet and outlet channel is communicated with the first cavity and the second cavity, and at least part of the air inlet and outlet channel forms a throttling section. The shut-off valve element is arranged in the air inlet and outlet channel, and when the first cavity is filled with liquid, the air inlet and outlet channel is closed. The throttling device is arranged in the throttling section and can stretch out and draw back in the axial direction of the air inlet and exhaust channel, and when the valve element is shut off to open the air inlet and exhaust channel and the pressure in the first cavity is increased, the throttling device stretches out or draws back to reduce the flow area of the first air inlet and exhaust channel. According to the water hammer eliminating tank, gas dissolution and consumption can be reduced, so that the situation that gas pressure needs to be frequently supplemented into the water hammer eliminating tank is avoided, the operation and maintenance cost is lower, and a boosting water hammer can be protected.

Description

Technical Field

[0001] The present invention relates to the technical field of water pipelines, and in particular, to a water hammer elimination tank. Background Art

[0002] In a water pipeline system, when an unexpected situation occurs, such as a sudden stop of a transfer pump or a sudden closure of a valve in the pipeline, a transient state of a sharp change in the flow rate and pressure of the fluid will occur in the pipeline, and this phenomenon is called water hammer. When water hammer occurs, the sharp change in the flow rate of the fluid in the pipe will cause the propagation of pressure waves, resulting in a rapid increase / decrease in the pipe pressure, and even the pipeline may collapse or be damaged due to the pressure waves.

[0003] In order to reduce or avoid the losses caused by water hammer hazards, generally, a water hammer protection device such as a water hammer elimination tank or a two-way pressure regulating tower is set in the pump water pipeline system. By supplying water and pressurizing to the pipeline and absorbing the water in the pipeline, the excessive pressure in the pipeline can be relieved, and the water hammer phenomenon caused by the sharp change in the fluid flow rate in the pipeline can be alleviated.

[0004] Among them, the existing water hammer elimination tanks are usually pressure tanks with elastic inner liners. By pre-charging pressurized compressed gas between the inner liner and the tank body to squeeze the capsule inner liner, the inner liner can expand and absorb water when the external pipeline pressure is too high, and when the external pipeline pressure is relatively low, the compressed gas squeezes the inner liner to supply water and pressurize to the external pipeline, so as to offset the pressure fluctuation of the water in the external pipeline. However, on the one hand, the inner liner needs to use elastic pressure-bearing materials, which are expensive, resulting in a high cost of the water hammer elimination tank. On the other hand, there is a risk of rupture and damage when the inner liner absorbs the excessive pressure in the pipeline, resulting in the failure of the water hammer elimination tank to protect the pipeline.

[0005] In response to this, Patent CN112066260B provides a pressure tank. The pressure tank cavity is divided into a first liquid cavity and a first gas cavity by a partition plate. A through hole is provided on the partition plate, and a first plugging member is provided to plug or release the through hole. That is, this pressure tank provides a water hammer elimination tank without an inner liner. However, the first plugging member in this structure plugs the through hole as the liquid level rises. When filling water into the tank body and the pipeline, the liquid level in the first liquid cavity of this pressure tank rises relatively fast, which is likely to cause water hammer to damage the pressure tank, and there may be a situation where water enters the first gas cavity due to the untimely response of the plugging member. Summary of the Invention

[0006] The present invention provides a water hammer elimination tank, aiming to overcome the above problems existing in the prior art.

[0007] To achieve this purpose, the present invention adopts the following technical solutions:

[0008] A water hammer elimination tank, comprising a first chamber, a second chamber, an air inlet and outlet passage, a shut-off valve core and a throttling device. Among them, the first chamber is provided with a water inlet and outlet, the second chamber is provided with a pressure regulating port, and the second chamber is used for accommodating positive pressure gas. The air inlet and outlet passage communicates the first chamber and the second chamber, and at least part of the air inlet and outlet passage is formed as a throttling section. The shut-off valve core is arranged in the air inlet and outlet passage, and when the first chamber is filled with liquid, the air inlet and outlet passage is closed. The throttling device is arranged in the throttling section and can expand and contract along the axial direction of the air inlet and outlet passage. When the shut-off valve core opens the air inlet and outlet passage and the pressure in the first chamber increases, the throttling device expands / contracts to reduce the flow area of the first air inlet and outlet passage.

[0009] According to the technical solution of the present invention, first, by filling the second chamber with pressurized gas, and arranging a shut-off valve core in the air inlet and outlet passage provided between the first chamber and the second chamber, when the first chamber is not filled with water, the first chamber and the second chamber are communicated, and when the first chamber is filled with water, the air inlet and outlet passage between the first chamber and the second chamber is closed. At this time, the gas in the second chamber will not contact the water in the first chamber during the normal operation stage of the water conveyance pipeline, which can reduce the dissolution and consumption of gas, thereby avoiding the need to frequently replenish air pressure into the second chamber of the water hammer elimination tank, and making the operation and maintenance costs of the water hammer elimination tank lower.

[0010] In addition, by forming a part of the air inlet and outlet passage as a throttling section, and using the throttling device to cooperate with the throttling section correspondingly to change the flow area of the air inlet and outlet passage, when the water hammer elimination tank is running and debugging and the first chamber is initially filled with water, or when the external waterway first undergoes a pressure drop and then a water pressure increase occurs, the liquid level in the first chamber rises. When the shut-off valve core opens the air inlet and outlet passage and the pressure in the first chamber increases, the throttling device reduces the flow area of the first air inlet and outlet passage, so that the gas discharge speed in the first chamber becomes slower, which can avoid the liquid level in the first chamber rising too fast, prevent the generation of closing water hammer when the shut-off valve core closes the air inlet and outlet passage, and thus has a good anti-water hammer impact effect on the water hammer elimination tank itself and a better buffering effect on the boosting water hammer. In addition, since the rising speed of the liquid level in the first chamber is controlled to be relatively slow, the shut-off valve core can respond in time to close the air inlet and outlet passage when the first chamber is filled with water, reducing the risk of the liquid in the first chamber entering the second chamber.

[0011] Finally, for the situation where the liquid level in the first chamber rises rapidly, such as when filling water into the waterway and the water hammer elimination tank, the pressure in the first chamber increases, so that the gas in the first chamber can only be discharged slowly, which can reduce the rising speed of the liquid level in the first chamber, and thus can respond in time when the first chamber is filled with water, the shut-off valve core closes the air inlet and outlet passage, reducing the risk of the liquid in the first chamber entering the second chamber.

[0012] As an alternative technical solution, the throttling device includes an elastic telescopic mechanism and a movable valve flap. Among them, the elastic telescopic mechanism includes an elastic member and a guide rod. The guide rod is fixed in the intake and exhaust passage and arranged along the axial direction of the intake and exhaust passage. The elastic member is arranged around the outer periphery of the guide rod, and the first end of the elastic member is fixed to the end of the guide rod. The movable valve flap is arranged in the throttling section of the intake and exhaust passage, and is movably sleeved on the surface of the guide rod and abuts against the second end of the elastic member.

[0013] According to the alternative technical solution, the movable valve flap is arranged in the intake and exhaust passage and has a large fluid resistance. Therefore, when there is a pressure difference between the first chamber and the second chamber, the movable valve flap will tend to move to the side with lower pressure. On this basis, through the limit of the elastic telescopic mechanism, the movable valve flap can move in the throttling section as the gas flow pressure changes, so as to change the flow area of the intake and exhaust passage. There is no need to separately set up communication devices such as sensors and controllers, the cost is low, and the regulation of the pressure change of the external pipeline is also more sensitive.

[0014] As an alternative 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 alternative technical solution, the movable valve flap is arranged in the conical flow channel, and the gap between the outer edge of the movable valve flap and the inner surface of the conical flow channel forms a flow channel. When the movable valve flap moves axially in the conical flow channel, the flow area of the gap between the outer edge of the movable valve flap and the inner surface of the conical flow channel changes.

[0016] As an alternative technical solution, the throttling section includes a channel body and an annular hollow plate. Among them, the annular hollow plate is fixed to the inner wall of the channel body and is arranged with a gap from the inner wall of the channel body, and the movable valve flap is arranged in the annular hollow plate.

[0017] According to this alternative technical solution, the movable valve flap is arranged in the annular hollow plate. The annular hollow plate is divided into upper and lower two regions by the movable valve flap. One region is a ventilation region, and the other region is an adjustment region. The first chamber and the second chamber are communicated through the ventilation region. When the movable valve flap moves axially in the conical flow channel, the ratio of the ventilation region to the adjustment region changes, thereby changing the area of the ventilation region, that is, changing the flow area at this place.

[0018] As an alternative technical solution, the movable valve flap is arranged with a gap from the throttling section.

[0019] According to an alternative technical solution, a clearance is provided between the movable valve flap and the throttling section, which can ensure that even when the movable valve flap is fully closed, there is still a certain ventilation area in the throttling section, preventing the intake and exhaust passage from being completely closed by the movable valve flap before the gas in the first chamber is fully discharged, thus avoiding premature blockage and the generation of closing water hammer. Additionally, leaving a clearance between the movable valve flap and the throttling section can prevent jamming between the movable valve flap and the inner surface of the throttling section due to frictional resistance.

[0020] As an alternative technical solution, the shut-off valve core includes a float and a shut-off valve flap. The shut-off valve flap and the float are sequentially arranged in the intake and exhaust passage from top to bottom along the direction of gravity. A switch valve seat is also fixed in the intake and exhaust passage, and a valve seat inlet is opened in the middle of the switch valve seat. When the shut-off valve core closes the intake and exhaust passage, the valve seat inlet and the shut-off valve flap form a sealing pair.

[0021] According to an alternative technical solution, the shut-off valve core can automatically respond to the rising liquid level and seal the intake and exhaust passage, without the need for additional communication control, with a fast response speed and a low failure risk.

[0022] As an alternative technical solution, a micro-exhaust passage is provided on the shut-off valve flap, and the float is arranged on the side of the micro-exhaust passage close to the first chamber.

[0023] According to an alternative technical solution, when a small amount of air accumulates in the first chamber, the liquid level drops slightly, the float falls, and the shut-off valve flap is still pressed against the valve seat inlet by the pressure in the first chamber. Therefore, by providing a micro-exhaust passage in the shut-off valve flap, micro-exhaust can be maintained in this case, and by correspondingly arranging the float and the micro-exhaust passage, it can further prevent liquid from flowing into the second chamber through the micro-exhaust passage.

[0024] As an alternative technical solution, the water hammer eliminator tank further includes an overpressure relief structure, which is correspondingly connected and communicated with the first chamber and the second chamber respectively.

[0025] According to an alternative technical solution, by correspondingly connecting and communicating the overpressure relief structure with the first chamber and the second chamber respectively, when the pressure exceeds the safety 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 eliminator tank.

[0026] As an alternative technical solution, the water hammer eliminator tank further includes a pressure regulating unit, which is connected to the pressure regulating port and is used to charge / discharge gas into the second chamber to adjust the pressure in the second chamber.

[0027] According to an alternative technical solution, the pressure regulating unit can charge or discharge gas into the second chamber to keep the air pressure in the water hammer eliminator tank stable at the pressure required for the working condition.

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

[0029] According to the alternative technical solution, only one tank body is divided to form two independent chambers, making the structure of the water hammer elimination tank more compact.

[0030] As an alternative technical solution, the water hammer elimination tank includes an independently arranged first tank body and a second tank body. The inside of the first tank body is the first chamber, the inside of the second tank body is the second chamber, and the first tank body and the second tank body are communicated via an air inlet and exhaust pipe, and an air inlet and exhaust passage is arranged at the air inlet and exhaust pipe.

[0031] According to the alternative technical solution, by arranging two independent pressure-bearing tanks, it is more suitable for scenarios where a water hammer elimination tank with a larger volume is required, and there is no need to weld a partition plate. The sealing performance and structural strength between the two chambers are also more reliable. Description of the Drawings

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

[0033] Figure 2 and Figure 3 are different situations where the first chamber and the second chamber are arranged in two independent tank bodies in an embodiment of the present invention;

[0034] Figure 4 is a schematic structural diagram of a specific throttle section and throttle device provided by the second embodiment of the present invention;

[0035] Figure 5 and Figure 6 are schematic structural diagrams of two specific throttle sections and throttle devices provided by the third embodiment of the present invention.

[0036] Description of the Reference Numerals:

[0037] 1. First chamber, 11. Water inlet and outlet;

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

[0039] 3. Air inlet and exhaust passage, 31. Throttle section, 31a. Conical flow channel, 31b. Channel main body, 31c. Annular hollow plate, 32. Switch valve seat;

[0040] 4. Shut-off valve core, 41. Float, 42. Shut-off valve flap, 43. Micro air exhaust channel;

[0041] 5. Throttle device, 51. Elastic telescopic mechanism, 511. Elastic member, 512. Guide rod, 52. Movable valve flap; 6. Overpressure relief structure; 7. Partition plate; 8. First tank body; 9. Second tank body. Detailed Implementation Manner

[0042] The present invention will be further described in detail below with reference to the accompanying drawings and embodiments. It can be understood that the specific embodiments described herein are only used to explain the present invention, rather than limiting the present invention. In addition, it should be noted that, for the sake of convenience of description, only the parts related to the present invention are shown in the accompanying drawings, rather than all the structures.

[0043] In the description of the present invention, unless otherwise clearly defined and limited, the terms "connected", "connected to", and "fixed" shall be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or integrated; it may be a mechanical connection or an electrical connection; it may be directly connected or indirectly connected through an intermediate medium, and it may be the internal communication of two components or the interaction relationship between two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0044] In the present invention, unless otherwise clearly defined and limited, the first feature being "above" or "below" the second feature may include the direct contact between the first and second features, or may include the situation where the first and second features are not in direct contact but in contact through other features therebetween. Moreover, the first feature being "above", "over", and "on" the second feature includes that the first feature is directly above and obliquely above the second feature, or simply means that the horizontal height of the first feature is higher than that of the second feature. The first feature being "below", "under", and "beneath" the second feature includes that the first feature is directly below and obliquely below the second feature, or simply means that the horizontal height of the first feature is lower than that of the second feature.

[0045] In the description of this embodiment, the orientation or positional relationship such as "above", "below", "left", and "right" is based on the orientation or positional relationship shown in the accompanying drawings. It is only for the convenience of description and simplifying the operation, rather than indicating or implying that the device or component referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation to the present invention. In addition, the terms "first" and "second" are only used for distinction in description and do not have special meanings.

[0046] First Embodiment

[0047] Figure 1A water hammer elimination tank provided by an embodiment of the present invention includes a first chamber 1, a second chamber 2, an air inlet and outlet passage 3, a shut-off valve core 4, and a throttling device 5. Among them, the first chamber 1 is provided with a water inlet and outlet 11, the second chamber 2 is provided with a pressure regulating port 21, the second chamber 2 is used to accommodate positive-pressure gas, the first chamber 1 and the second chamber 2 are communicated via the air inlet and outlet passage 3, and both the shut-off valve core 4 and the throttling device 5 are arranged in the air inlet and outlet passage 3, and the gas flow between the first chamber 1 and the second chamber 2 is adjusted by controlling the flow area of the air inlet and outlet passage 3, or by controlling the on-off of the air inlet and outlet passage 3.

[0048] Among them, the first chamber 1 is provided with a water inlet and outlet 11, which is communicated with an external pipeline and used to supplement liquid to the external pipeline or accommodate the overpressure liquid in the external pipeline. The water inlet and outlet 11 can be arranged at any part of the first chamber 1. In order to prevent water from splashing when entering the chamber, the water inlet and outlet 11 can be arranged at the bottom of the first chamber 1. The second chamber 2 is provided with a pressure regulating port 21, and positive-pressure gas can be accommodated in the second chamber 2. Positive-pressure gas can be filled into the second chamber 2 through the pressure regulating port 21, or air can be released through the pressure regulating port 21 to maintain the air pressure stability in the second chamber 2. Preferably, a pressure regulating unit can be communicated outside the second chamber 2, and the pressure regulating unit can be a pressurizing mechanism, such as an air compressor, to pressurize the second chamber 2 when the gas pressure in the second chamber 2 is insufficient.

[0049] It should be noted that Figure 1 illustrates the case where the same tank body is separated by a partition 7 to form the first chamber 1 and the second chamber 2. In the above way, only one tank body separation can form two independent chambers. Further, by opening holes in the partition 7, the air inlet and outlet passage 3, the shut-off valve core 4, and the throttling device 5 can be arranged at the holes in the partition 7, making the structure of the water hammer elimination tank more compact. However, the present invention is not limited thereto. The first chamber 1 and the second chamber 2 can also be arranged in independent tank bodies, and the positions and connection manners between the two tank bodies are not limited herein. For example, the two tank bodies can be arranged horizontally side by side, obliquely, vertically, etc., and the above all belong to the protection scope of the present invention.

[0050] Figure 2 and Figure 3 respectively illustrate different cases where the first chamber 1 and the second chamber 2 are arranged in two independent tank bodies. Arranging the first chamber 1 and the second chamber 2 in two independent tank bodies (the first tank body 8 and the second tank body 9) is more suitable for scenarios where a water hammer elimination tank with a larger volume is required, and there is no need to weld the partition 7, and the sealing performance and structural strength between the two chambers are more reliable. Here, the case where the tank body where the first chamber 1 is located is the first tank body 8 and the tank body where the second chamber 2 is located is the second tank body 9 is taken as an example. According to the actual installation environment requirements, such as Figure 2As shown, the first tank body 8 and the second tank body 9 can be arranged horizontally side by side, and the tops of the first tank body 8 and the second tank body 9 are connected by a pressure-bearing pipe. The air inlet and outlet passage 3, the shut-off valve core 4 and the throttling device 5 can be arranged at this pressure-bearing pipe.

[0051] Alternatively, as Figure 3 shown, the first tank body 8 and the second tank body 9 can also be stacked along the direction of gravity. Specifically, the second tank body 9 can be arranged in a way that it is stacked above the first tank body 8, and the top of the first tank body 8 is connected to any part of the second tank body 9 through a pressure-bearing pipe. In the figure, an example shows the case where the pressure-bearing pipe is connected to the middle part of the side of the second tank body 9. In this way, the air inlet and outlet passage 3, the shut-off valve core 4 and the throttling device 5 can be arranged on one side of the second tank body 9, so that the up-and-down structure of the first tank body 8 and the second tank body 9 can be more compact, reducing the height of the overall device. In some other embodiments, the top of the first tank body 8 and the bottom of the second tank body 9 can also be connected, and the air inlet and outlet passage 3, the shut-off valve core 4 and the throttling device 5 can be arranged between the first tank body 8 and the second tank body 9 stacked up and down, which can reduce the length of the pressure-bearing pipe and improve the pressure-bearing reliability of the overall device.

[0052] Furthermore, since the water hammer elimination tank is a pressure vessel with a pressure medium stored inside, in order to improve safety, the water hammer elimination tank is also provided 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 (the first chamber 1 and the second chamber 2), two overpressure relief structures 6 can be set, and the two overpressure relief structures 6 are respectively and correspondingly connected to the first chamber 1 and the second chamber 2, so as to improve the overall safety of the water hammer elimination tank.

[0053] Furthermore, the water hammer elimination tank also includes a shut-off valve core 4 arranged at the exhaust passage. When the first chamber 1 is filled with liquid, the exhaust passage is closed. The specific structure of the shut-off valve core 4 is not limited here, and any valve core that can close the exhaust passage when the first chamber 1 is filled with liquid is applicable to the present invention. For example, in some embodiments, the shut-off valve core 4 can be a floating ball. Due to the gravity parameter of the floating ball, the gas cannot make the floating ball float up, and the rising liquid level will make the floating ball float up to close the exhaust passage, so as to be able to close the exhaust passage when the first chamber 1 is filled with liquid. Or, in some 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 of the first chamber 1 reaches the top, the electronic control valve closes the exhaust passage. The above all belong to the protection scope of the present invention.

[0054] It is worth mentioning that in this embodiment, the intake and exhaust passage 3 communicates with the first chamber 1 and the second chamber 2, and at least a part of the intake and exhaust passage 3 is formed as a throttling section 31. Correspondingly, a throttling device 5 is further provided in the throttling section 31. The throttling device 5 is arranged in the throttling section 31 and can axially expand and contract along 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 expands / contracts to reduce the flow area of the first intake and exhaust passage 3.

[0055] Among them, the structures of the throttling device 5 and the throttling section 31 are not limited herein. The throttling device 5 only needs to have a valve flap that cooperates with the throttling section 31, and a mechanism for controlling the movement of the valve flap 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 expansion and contraction mechanism 51 and a movable valve flap 52. The elastic expansion and contraction mechanism 51 includes an elastic member 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 member 511 is arranged around the outer periphery of the guide rod 512, and the first end of the elastic member 511 is fixed to the end of the guide rod 512. The movable valve flap 52 is arranged in the throttling section 31 of the intake and exhaust passage 3, and is movably sleeved on the surface of the guide rod 512 and abuts against the second end of the elastic member 511. The movable valve flap 52 is arranged in the intake and exhaust passage 3 and is affected by the fluid pressure. Therefore, when there is a pressure difference between the first chamber 1 and the second chamber 2, the movable valve flap 52 will have a tendency to move towards the side with lower pressure. On this basis, through the acting force of the elastic expansion and contraction mechanism 51, the movable valve flap 52 can move in the throttling section 31 as the gas flow pressure changes to change the flow area of the intake and exhaust passage 3. There is no need to separately install communication devices such as sensors and controllers, the cost is lower, and the regulation of the pressure change of the external pipeline is more sensitive.

[0056] In this embodiment, first, the second chamber 2 is filled with pressurized gas, and a shut-off valve core 4 is provided in the intake and exhaust passage 3 provided between the first chamber 1 and the second chamber 2. When the first chamber 1 is not filled with water, the first chamber 1 and the second chamber 2 are communicated. When the first chamber 1 is filled with water, the intake and exhaust passage 3 between the first chamber 1 and the second chamber 2 is closed. At this time, the gas in the second chamber 2 will not contact the water in the first chamber 1 during the normal operation stage of the water conveyance pipeline, which can reduce the dissolution and consumption of the gas, thereby avoiding the need to frequently replenish the air pressure in the second chamber 2 of the water hammer elimination tank, and making the operation and maintenance costs of the water hammer elimination tank lower.

[0057] In addition, by forming a part of the intake and exhaust passage 3 into a throttling section 31, and using the throttling device 5 to cooperate with the throttling section 31 correspondingly to change the flow area of the intake and exhaust passage 3, when the water hammer elimination tank is running and debugging to initially fill water into the first chamber 1, or when the external waterway first undergoes a pressure drop and then the transmitted water pressure rises, 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, so that the gas discharge speed in the first chamber 1 slows down, which can avoid the liquid level in the first chamber 1 rising too fast and prevent the generation of closing water hammer when the shut-off valve core 4 closes the intake and exhaust passage 3, thus having a good anti-water hammer impact effect on the water hammer elimination tank itself and a better buffering effect on the boosting water hammer. In addition, since the rising speed of the liquid level in the first chamber 1 is controlled to be relatively slow, the shut-off valve core 4 can respond in time to close the intake and exhaust passage 3 when the first chamber 1 is filled with water, reducing the risk of the liquid in the first chamber 1 entering the second chamber 2.

[0058] Finally, for the case where the liquid level in the first chamber 1 rises rapidly, such as when filling water into the waterway and the water hammer elimination tank, the pressure in the first chamber 1 rises rapidly, so that the gas in the first chamber 1 can only be discharged slowly, which can reduce the rising speed of the liquid level in the first chamber 1, and thus can respond in time when the first chamber 1 is filled with water, and the shut-off valve core 4 closes the intake and exhaust passage 3, reducing the risk of the liquid in the first chamber 1 entering the second chamber 2.

[0059] Second Embodiment

[0060] Compared with the first embodiment, the second embodiment of the present invention provides a more detailed structure of the throttling section 31 and the throttling device 5. Other structures not described are the same as those in the first embodiment and will not be elaborated here.

[0061] Figure 4 It is a schematic structural diagram of a specific throttling section 31 and throttling device 5 provided by the second embodiment of the present invention. As Figure 4 shown, the throttling section 31 can be formed into a conical flow channel 31a, and the inner diameter of the end of the conical flow channel 31a facing the first chamber 1 is larger than the inner diameter of the end of the conical flow channel 31a facing the second chamber 2. The movable valve flap 52 is placed in the conical flow channel 31a, and the gap between the outer edge of the movable valve flap 52 and the inner surface of the conical flow channel 31a forms a flow channel, and when the movable valve flap 52 moves axially in the conical flow channel 31a, the flow area of the gap between the outer edge of the movable valve flap 52 and the inner surface of the conical flow channel 31a changes.

[0062] Among them, when the shut-off valve core 4 opens the air intake and exhaust passage 3 and the pressure in the first chamber 1 increases, the gas in the first chamber pushes the movable valve flap 52 upward, and the movable valve flap 52 moves toward the second chamber 2 along the central axis of the conical flow passage 31a. Preferably, the inner diameter of the end of the conical flow passage 31a facing the first chamber 1 can be set to be larger than the inner diameter of the end of the conical flow passage 31a facing the second chamber 2. When the movable valve flap 52 moves toward the second chamber 2, the clearance area between the movable valve flap 52 and the inner surface of the conical flow passage 31a decreases, that is, the flow area of the air intake and exhaust passage 3 decreases.

[0063] On this basis, further, the clearance between the movable valve flap 52 and the inner wall at the minimum inner diameter of the conical flow passage 31a can be set. Setting the clearance between the movable valve flap 52 and the minimum inner diameter of the conical flow passage 31a can ensure that even when the movable valve flap 52 is completely closed, the throttling section 31 can still have a certain ventilation area, which can prevent the movable valve flap 52 from completely closing the air intake and exhaust passage 3 when the gas in the first chamber 1 is not completely exhausted, that is, it can prevent premature blockage and the generation of closing water hammer. In addition, leaving a clearance between the movable valve flap 52 and the throttling section 31 can prevent the occurrence of jamming between the movable valve flap 52 and the inner surface of the throttling section 31 due to frictional resistance.

[0064] Third Embodiment

[0065] Compared with the first embodiment, the third embodiment of the present invention provides a more detailed structure of the throttling section 31 and the throttling device 5. Other structures not described are the same as those in the first embodiment and will not be elaborated here.

[0066] Figure 5 and Figure 6 are schematic structural diagrams of two specific throttling sections 31 and throttling devices 5 provided by the third embodiment of the present invention. As Figure 5 and 6 shown, the throttling section 31 includes a channel main body 31b and an annular hollow plate 31c. Among them, the annular hollow plate 31c is fixed to the inner wall of the channel main body 31b and is provided with a clearance from the inner wall of the channel main body 31b, and the movable valve flap 52 is arranged inside the annular hollow plate 31c. The movable valve flap 52 is arranged inside the annular hollow plate 31c, and the annular hollow plate 31c is divided into upper and lower two regions by the movable valve flap 52. One region is the ventilation area, and the other region is the adjustment area. The first chamber 1 and the second chamber 2 are communicated via the ventilation area, and when the movable valve flap 52 moves axially in the conical flow passage 31a, 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 this place.

[0067] To ensure rapid pressure relief of the first chamber 1, the end of the annular hollow plate 31c facing the second chamber 2 can be hermetically fixed to the inner wall of the air inlet and exhaust passage 3. When the shut-off valve core 4 opens the air inlet and exhaust passage 3 and the pressure in the first chamber 1 increases, the gas in the first chamber pushes the movable valve flap 52 upward, and the movable valve flap 52 moves toward the second chamber 2, which can reduce the ventilation area, that is, reduce the flow area of the air inlet and exhaust passage 3.

[0068] Optionally, the movable valve flap 52 can be arranged with a gap from the annular hollow plate 31c. Arranging the movable valve flap 52 with a gap from the throttle section 31 can ensure that even when the movable valve flap 52 is fully closed, the throttle section 31 still has a certain ventilation area, which can prevent the movable valve flap 52 from completely closing the air inlet and exhaust passage 3 before the gas in the first chamber 1 is completely exhausted, that is, it can avoid premature blockage and the generation of closing water hammer. In addition, leaving a gap between the movable valve flap 52 and the throttle section 31 can prevent jamming between the movable valve flap 52 and the inner surface of the throttle section 31 due to frictional resistance.

[0069] Fourth Embodiment

[0070] Compared with the first embodiment, the fourth embodiment of the present invention provides a more detailed structure of the shut-off valve core 4. Other structures not described are the same as those in the first embodiment and will not be elaborated here.

[0071] The shut-off valve core 4 can be a floating ball, a hemispherical valve flap or a disc-shaped valve flap, which is not limited here. The shut-off valve flap 42 is arranged at the air inlet and exhaust passage 3. When the first chamber 1 is filled with water, the shut-off valve flap 42 closes the air inlet and exhaust passage 3. Preferably, the shut-off valve core 4 is a floating ball, which can automatically respond and seal off the air inlet and exhaust passage 3 as the liquid level rises, without additional communication control, with a fast response speed and a low failure risk.

[0072] Reference Figure 4 and Figure 5 As shown in [relevant figure numbers] and [relevant figure numbers], the shut-off valve core 4 can also include a float 41 and a shut-off valve flap 42. The shut-off valve flap 42 and the float 41 are sequentially arranged in the air inlet and exhaust passage 3 from top to bottom along the direction of gravity. A switch valve seat 32 is also fixed in the air inlet 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 air inlet and exhaust passage 3, the valve seat inlet and the shut-off valve flap 42 form a sealing pair. Further, a micro air exhaust passage 43 is provided on the shut-off valve flap 42, and the float 41 is arranged on the side of the micro air exhaust passage 43 close to the first chamber 1.

[0073] 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 flap 42 is still pressed tightly against the valve seat inlet by the pressure in the first chamber 1. Therefore, by providing a micro-exhaust passage 43 in the shut-off valve flap 42, micro-exhaust can be maintained in this case. By correspondingly arranging the float 41 and the micro-exhaust passage 43, it is further possible to prevent the liquid from flowing into the second chamber 2 through the micro-exhaust passage 43.

[0074] Obviously, the above embodiments of the present invention are merely examples for clearly explaining the present invention, rather than limitations on the implementation manners of the present invention. For those of ordinary skill in the art, various obvious changes, re-adjustments and substitutions can be made without departing from the protection scope of the present invention. It is not necessary and impossible to enumerate all the implementation manners here. Any modifications, equivalent substitutions and improvements made within the spirit and principle of the present invention shall be included within the protection scope of the claims of the present invention.

Claims

1. A water hammer elimination tank, characterized in that, Comprising: A first chamber (1) provided with an inlet / outlet port (11); A second chamber (2) provided with a pressure regulating port (21), the second chamber (2) being adapted to accommodate positive pressure gas; An intake / exhaust passage (3) communicating the first chamber (1) and the second chamber (2), at least a part of the intake / exhaust passage (3) being formed as a throttling section (31); A shut-off valve element (4) disposed in the intake / exhaust passage (3), which closes the intake / exhaust passage (3) when the first chamber (1) is filled with liquid; A throttling device (5) disposed in the throttling section (31) and axially telescopic along the intake / exhaust passage (3), when the shut-off valve element (4) opens the intake / exhaust passage (3) and the pressure in the first chamber (1) rises, the throttling device (5) extends / contracts to reduce the flow area of the first intake / exhaust passage (3).

2. The water hammer elimination tank according to claim 1, characterized in that, The throttling device (5) includes: An elastic telescopic mechanism (51), including an elastic member (511) and a guide rod (512), the guide rod (512) being fixed in the intake / exhaust passage (3) and disposed along the axial direction of the intake / exhaust passage (3), the elastic member (511) being disposed around the outer periphery of the guide rod (512), and a first end of the elastic member (511) being fixed to an end of the guide rod (512); A movable valve flap (52) disposed in the throttling section (31) of the intake / exhaust passage (3), and movably sleeved on the surface of the guide rod (512) and abutted against a second end of the elastic member (511).

3. The water hammer elimination tank according to claim 2, wherein, The throttling section (31) is a conical flow channel (31a), and an inner diameter of an end of the conical flow channel (31a) facing the first chamber (1) is larger than an inner diameter of an end of the conical flow channel (31a) facing the second chamber (2).

4. The water hammer elimination tank according to claim 2, characterized in that, The throttling section (31) includes: A channel main body (31b); An annular hollow plate (31c) fixed to an inner wall of the channel main body (31b) and disposed with a gap from the inner wall of the channel main body (31b), and the movable valve flap (52) is disposed in the annular hollow plate (31c).

5. The water hammer elimination tank according to claim 3 or 4, characterized in that, The movable valve flap (52) is disposed with a gap from the throttling section (31).

6. The water hammer elimination tank according to any one of claims 1-4, characterized in that The shut-off valve element (4) includes a float (41) and a shut-off valve flap (42), and the shut-off valve flap (42) and the float (41) are sequentially disposed in the intake / exhaust passage (3) from top to bottom along the gravity direction; A switch valve seat (32) is further fixed in the intake / exhaust passage (3), a valve seat inlet is opened in the middle of the switch valve seat (32), and when the shut-off valve element (4) closes the intake / exhaust passage (3), the valve seat inlet and the shut-off valve flap (42) form a sealing pair.

7. The water hammer elimination tank according to claim 6, characterized in that, A micro exhaust passage (43) is provided on the shut-off valve flap (42), and the float (41) is disposed on a side of the micro exhaust passage (43) close to the first chamber (1).

8. The water hammer elimination tank according to any one of claims 1-4, characterized in that, It further includes an overpressure relief structure (6) correspondingly communicated with the first chamber (1) and the second chamber (2) respectively.

9. The water hammer elimination tank according to any one of claims 1-4, characterized in that, It further includes: A pressure regulating unit, which is connected to the pressure regulating port (21) and is used to fill / vent the second chamber (2) to adjust the pressure in the second chamber (2).

10. The water hammer elimination tank according to any one of claims 1 to 4, characterized in that, It includes a tank body, and the first chamber (1) and the second chamber (2) are formed by being separated by a partition plate (7) inside the tank body.

11. The water hammer elimination tank according to any one of claims 1-4, characterized in that, It includes an independently arranged first tank body (8) and a second tank body (9). The inside of the first tank body (8) is the first chamber (1), and the inside of the second tank body (9) is the second chamber (2). The first tank body (8) and the second tank body (9) are connected through an air inlet and exhaust pipeline, and the air inlet and exhaust channel (3) is arranged at the air inlet and exhaust pipeline.

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