Water hammer eliminating tank

Abstract

The invention discloses a water hammer eliminating tank, and relates to the technical field of water delivery pipelines, the water hammer eliminating tank comprises a first chamber, a second chamber and an air intake and exhaust unit, the air intake and exhaust unit is provided with an air intake channel and an air exhaust channel, and the first chamber and the second chamber are communicated through the air intake channel and the air exhaust channel; the cross sectional area of the air inlet channel is larger than that of the exhaust channel, and when the difference value obtained by subtracting the pressure of the first cavity from the pressure of the second cavity is not larger than the preset pressure difference, the air inlet channel is closed; when the difference value obtained by subtracting the pressure of the first cavity from the pressure of the second cavity is larger than the preset pressure difference, the air inlet channel is opened, and the air inlet and outlet unit further comprises a shut-off valve element which is arranged at the position of the air outlet channel and closes the air outlet channel when the first cavity is filled with liquid. The water hammer eliminating tank can absorb pressure boosting water hammers generated by an external water path and supplement pressure for pressure reducing water hammers generated by the external water path, and a good pipeline water hammer protection effect is achieved.

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 the sudden stop of a transfer pump or the sudden closing of a valve in the pipeline, a transient state of rapid changes 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 rapid change in the flow rate of the fluid in the pipe will cause the propagation of pressure waves, resulting in a rapid rise / fall in the pipe pressure, and even the pipeline may collapse or be damaged due to the pressure wave.

[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 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 rapid 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 to 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 the external pipeline, thereby offsetting 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 to the inner liner when absorbing 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. A through hole is provided on the partition, and a first plugging member is provided to plug or release the plugging of the through hole. That is, this pressure tank provides a water hammer elimination tank without an inner liner. However, in this structure, the first plugging member 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 easy to generate water hammer and 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 and an air intake and exhaust unit. 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 filled with positive pressure gas inside. The air intake and exhaust unit has an air intake channel and an air exhaust channel. The first chamber and the second chamber are communicated via the air intake channel and the air exhaust channel. The cross-sectional area of the air intake channel is larger than that of the air exhaust channel. When the difference between the pressure in the second chamber and the pressure in the first chamber is not greater than a preset pressure difference, the air intake channel is closed; when the difference between the pressure in the second chamber and the pressure in the first chamber is greater than the preset pressure difference, the air intake channel is opened. It is worth mentioning that the air intake and exhaust unit further includes a shut-off valve core disposed at the air exhaust channel. When the first chamber is filled with liquid, the air exhaust channel is closed.

[0009] According to the technical solution of the present invention, firstly, by filling the second chamber with positive pressure gas, and when the first chamber is not filled with water, the first chamber and the second chamber are communicated. When the first chamber is filled with water, the first chamber and the second chamber are cut off, so that the boost water hammer generated by the external water circuit can be absorbed and the pressure of the external water circuit can be supplemented for the depressurization water hammer generated by the external water circuit, playing a good role in protecting the pipeline water hammer.

[0010] Then, by providing two channels with different cross-sections (the air intake channel and the air exhaust channel) to communicate the first chamber and the second chamber, and when the external water circuit has a depressurization water hammer, the air intake channel with a larger cross-section is kept open to ensure that the pressure in the external water circuit can be quickly and timely supplemented. When the external water circuit has a boost water hammer, the air intake channel with a larger cross-section is closed, and the air exhaust channel with a smaller cross-section is kept open. The gas in the first chamber cannot be quickly discharged into the second chamber, so as to avoid generating a boost water hammer due to the rapid rise of the liquid level and filling the first chamber, thus having a better protection effect on the boost water hammer.

[0011] Finally, for the situation where the liquid level in the first chamber rises rapidly, such as when filling the water circuit and the water hammer elimination tank, only the air exhaust channel with a smaller cross-section is used for exhausting gas, which can reduce the rising speed of the liquid level in the first chamber, so that the shut-off valve core can respond in time to close the air exhaust channel when the first chamber is filled with water, reducing the risk of the liquid in the first chamber entering the second chamber.

[0012] As a preferred technical solution, the air intake and exhaust unit includes a one-way air intake device. The one-way air intake device is disposed at the air intake channel. The one-way air intake device includes a valve seat, a sealing valve flap and an elastic normally closed mechanism. The valve seat is fixed in the air intake channel. A valve seat inlet is opened in the middle of the valve seat. The sealing valve flap is disposed on the side of the valve seat close to the first chamber and is pressed and sealed with the valve seat inlet. The elastic normally closed mechanism includes an elastic member and a pull rod. The elastic member is fixed on one side of the valve seat. One end of the pull rod is fixed to the elastic member, and the other end passes through the valve seat inlet and is fixed to the sealing valve flap, so that the sealing valve flap is pressed against the valve seat inlet.

[0013] According to this preferred technical solution, when the pressure in the first chamber rises to a point where the pressure difference between the second chamber and the first chamber is less than or equal to the elastic force of the elastic member on the sealing valve flap, the elastic member remains contracted, pressing the sealing valve flap tightly against the inlet of the valve seat, and the air intake passage remains closed; when the pressure in the first chamber drops to a point where the pressure difference between the second chamber and the first chamber is greater than the elastic force of the elastic member on the sealing valve flap, the elastic member stretches, and the sealing valve flap leaves the valve seat, thereby opening the air intake passage. In this way, when the pressure in the first chamber drops to a certain extent, the one-way air intake device can automatically respond and open.

[0014] As a preferred technical solution, the inner diameter of the exhaust passage is 1.6 - 5 mm.

[0015] According to this preferred technical solution, if the inner diameter of the exhaust passage is too large, it cannot achieve the technical effect of slow exhaust. If the inner diameter of the exhaust passage is too small, the air in the first chamber cannot be discharged in time, easily leading to overpressure in the first chamber. Setting the exhaust passage within the range of 1.6 - 5 mm can achieve the effect of slow exhaust while ensuring the pressure-bearing reliability of the first chamber.

[0016] As a preferred technical solution, the shut-off valve core includes a valve flap and a floating body. Among them, there is an exhaust port in the exhaust passage, and the valve flap is arranged on the side of the exhaust port facing the direction of gravity. The floating body is linked with the valve flap and applies its own gravity to the valve flap. When the liquid level rises to the position where the floating body is located, the floating body rises with the liquid level, driving the valve flap to press tightly against the exhaust port.

[0017] According to this preferred technical solution, the shut-off valve core can automatically respond and close the exhaust passage as the liquid level rises, without the need for additional communication control, with a fast response speed and a low failure risk.

[0018] As a preferred technical solution, the exhaust passage is formed in a way that penetrates the sealing valve flap, and the shut-off valve core is correspondingly arranged on the side of the sealing valve flap facing the direction of gravity.

[0019] According to this preferred technical solution, integrating the one-way air intake unit, the exhaust passage, and the shut-off valve core into a whole is convenient for installation and the structure is more compact.

[0020] As a preferred technical solution, the water hammer elimination 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. The pressure regulating unit can keep the gas pressure in the second chamber stable when the gas pressure in the second chamber fluctuates.

[0021] As a preferred technical solution, the water hammer elimination tank includes a tank body, and the tank body is divided by a partition to form a first chamber and a second chamber.

[0022] According to this preferred technical solution, only one tank partition can form two independent chambers, making the structure of the water hammer eliminator tank more compact.

[0023] As a preferred technical solution, the water hammer eliminator tank includes a first tank and a second tank that are independently arranged. The inside of the first tank is the first chamber, and the inside of the second tank is the second chamber. The first tank and the second tank are connected through an air inlet and exhaust pipe, and an air inlet and exhaust unit is arranged at the air inlet and exhaust pipe.

[0024] According to this preferred technical solution, by setting two independent pressure-bearing tanks, it is more suitable for scenarios where a water hammer eliminator tank with a larger volume is required, and there is no need to weld partitions, and the seal between the two chambers is more reliable.

[0025] As a preferred technical solution, the first tank and the second tank are arranged vertically along the gravity direction, with the second tank arranged above the first tank, or the first tank and the second tank are arranged adjacent to each other horizontally.

[0026] As a preferred technical solution, the water hammer eliminator tank further includes a safety valve, and the safety valve is respectively and correspondingly connected to the first chamber and the second chamber.

[0027] According to this preferred technical solution, by respectively and correspondingly connecting two safety valves to the first chamber and the second chamber, the overall safety of the water hammer eliminator tank can be improved. Description of the Drawings

[0028] Figure 1 is a schematic structural diagram of a water hammer eliminator tank provided by an embodiment of the present invention;

[0029] Figure 2 and Figure 3 are different situations where the first chamber and the second chamber are arranged in two independent tanks provided by an embodiment of the present invention;

[0030] Figures 4 - 7 are schematic structural diagrams of four different air inlet and exhaust units provided by an embodiment of the present invention.

[0031] Description of the Reference Numerals:

[0032] 1 - First chamber, 11 - Water inlet and outlet;

[0033] 2 - Second chamber, 21 - Pressure regulating port;

[0034] 3 - Intake and exhaust unit, 31 - Intake channel, 32 - Exhaust channel, 321 - Exhaust port, 33 - Shut-off valve core, 331 - Valve flap, 332 - Floating body, 34 - Unidirectional intake device, 341 - Valve seat, 342 - Sealing valve flap, 343 - Elastic member, 344 - Pull rod, 35 - First housing, 36 - Second housing, 37 - Connecting pipe, 38 - Bypass pipe;

[0035] 4 - Partition board; 5 - First tank body; 6 - Second tank body; 7 - Intake and exhaust pipeline; 8 - Safety valve. Detailed implementation manners

[0036] The present invention will be further described in detail below with reference to the 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 convenience of description, only the parts related to the present invention are shown in the drawings, rather than all the structures.

[0037] In the description of the present invention, unless otherwise clearly defined and limited, the terms "connected", "connected to", and "fixed" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or integrated; it can be a mechanical connection or an electrical connection; it can be directly connected, or indirectly connected through an intermediate medium, and it can be the communication inside two elements or the interaction relationship between two elements. 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 situations.

[0038] 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 merely indicates 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 merely indicates that the horizontal height of the first feature is lower than that of the second feature.

[0039] 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 drawings. It is only for the convenience of description and simplifying the operation, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it cannot be understood as a limitation to the present invention. In addition, the terms "first" and "second" are only used for distinction in description and have no special meaning.

[0040] Figure 1This is a schematic structural diagram of a water hammer elimination tank provided by an embodiment of the present invention. Combining Figure 1 Looking at it, the water hammer elimination tank includes two chambers (a first chamber 1 and a second chamber 2), which are independently arranged between the two chambers and are communicated via an air inlet and exhaust unit 3.

[0041] Among them, the first chamber 1 is provided with a water inlet and outlet 11, which is communicated with an external pipeline for replenishing liquid to the external pipeline or accommodating 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. 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 the gas 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. 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.

[0042] It should be noted that Figure 1 The case where the same tank body is separated by a partition 4 to form a first chamber 1 and a second chamber 2 is illustrated by way of example. In the above manner, only one tank body needs to be separated to form two independent chambers. Further, by opening holes in the partition 4, the air inlet and exhaust unit 3 can be arranged at the holes in the partition 4, 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 placement method between the two tank bodies is not limited herein. For example, the two tank bodies can be arranged horizontally side by side, obliquely, vertically, etc., and the above all fall within the protection scope of the present invention.

[0043] Figure 2 and Figure 3 respectively show different situations 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 (a first tank body 5 and a second tank body 6) 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 4, and the seal between the two chambers is more reliable. Here, the case where the tank body where the first chamber 1 is located is the first tank body 5 and the tank body where the second chamber 2 is located is the second tank body 6 is taken as an example for illustration. According to the actual installation environment requirements, as Figure 2 shown, the first tank body 5 and the second tank body 6 can be arranged horizontally side by side, and the tops of the first tank body 5 and the second tank body 6 are communicated by an air inlet and exhaust pipeline 7. The air inlet and exhaust pipeline 7 is a pressure-bearing pipe, and the air inlet and exhaust unit 3 can be arranged at the air inlet and exhaust pipeline 7.

[0044] Or, as Figure 3As shown, the first tank body 5 and the second tank body 6 can also be stacked along the gravity direction. Specifically, the second tank body 6 can be arranged in a way that it is stacked above the first tank body 5, and the top of the first tank body 5 is communicated with any part of the second tank body 6 through the air inlet and exhaust pipeline 7. In the figure, an example is shown where the air inlet and exhaust pipeline 7 is communicated with the middle part of the side surface of the second tank body 6. In this way, the air inlet and exhaust unit 3 can be arranged on one side of the second tank body 6, so that the up-and-down structure of the first tank body 5 and the second tank body 6 can be more compact, reducing the height of the overall device. In some other embodiments, the top of the first tank body 5 and the bottom of the second tank body 6 can also be communicated, and the air inlet and exhaust unit 3 is arranged between the first tank body 5 and the second tank body 6 stacked up and down, which can reduce the length of the pressure-bearing pipe and improve the pressure-bearing reliability of the overall device.

[0045] Furthermore, since it is a pressure vessel with pressurized gas stored inside, a safety valve 8 generally needs to be set for the water hammer elimination tank. Considering that the water hammer elimination tank in this embodiment has two pressurized chambers (the first chamber 1 and the second chamber 2), two safety valves 8 can be set, and the two safety valves 8 are respectively and correspondingly communicated with the first chamber 1 and the second chamber 2, so as to improve the overall safety of the water hammer elimination tank.

[0046] As Figure 4 shown, the air inlet and exhaust unit 3 has an air inlet channel 31 and an air exhaust channel 32. The air inlet channel 31 and the air exhaust channel 32 are two parallel flow channels. The first chamber 1 and the second chamber 2 are communicated through the air inlet channel 31 and the air exhaust channel 32, that is, the first chamber 1 and the second chamber 2 can be separately communicated by the air inlet channel 31 or can be separately communicated by the air exhaust channel 32. Specifically, when the difference between the pressure of the second chamber 2 and the pressure of the first chamber 1 is not greater than the preset pressure difference, the air inlet channel 31 is closed; when the difference between the pressure of the second chamber 2 and the pressure of the first chamber 1 is greater than the preset pressure difference, the air inlet channel 31 is opened.

[0047] Furthermore, the air inlet and exhaust unit 3 further includes a shut-off valve core 33 arranged at the air exhaust channel 32. When the first chamber 1 is filled with liquid, the air exhaust channel 32 is closed. The specific structure of the shut-off valve core 33 is not limited here, and any valve core that can close the air exhaust channel 32 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 33 can be a floating ball. Gas cannot make the floating ball float up, and the rising liquid level will make the floating ball float up to close the air exhaust channel 32, so as to be able to close the air exhaust channel 32 when the first chamber 1 is filled with liquid. Or, in some other embodiments, the shut-off valve core 33 can be an electronic control valve and a liquid level sensor. When it is detected that the liquid level of the first chamber 1 reaches the top, the electronic control valve closes the air exhaust channel 32. The above all belong to the protection scope of the present invention.

[0048] In the above manner, when the external waterway pressure drops (for example, when the water pump suddenly stops), the pressure in the first chamber 1 decreases until the difference between the pressure in the second chamber 2 and the pressure in the first chamber 1 is greater than the preset pressure difference, that is, when the pressure in the first chamber 1 decreases to the point where the pressure difference between the second chamber 2 and the first chamber 1 is greater than the preset pressure difference, the air intake passage 31 opens. At this time, since the liquid in the first chamber 1 is not full, the exhaust passage 32 also remains open. The pressurized gas in the second chamber 2 enters the first chamber 1 through the air intake passage 31 and the exhaust passage 32, and presses the water in the first chamber 1 towards the water inlet / outlet 11. Thus, the water in the first chamber 1 replenishes the external waterway, increasing the pressure in the external waterway and reducing the pressure drop head caused by the pump stop.

[0049] When the pressure in the first chamber 1 increases, for example, after a pressure-reducing water hammer occurs, a part of the liquid will be transmitted back to the first chamber 1 in the form of a pressure-increasing wave, thereby increasing the pressure in the first chamber 1. When the difference between the pressure in the second chamber 2 and the pressure in the first chamber 1 is less than or equal to the preset pressure difference, that is, when the pressure in the first chamber 1 rises to the point where the pressure difference between the first chamber 1 and the second chamber 2 is less than or equal to the preset pressure value, the air intake passage 31 closes. Before the liquid level in the first chamber 1 rises to fill the first chamber 1, the exhaust passage 32 remains open. The liquid level in the first chamber 1 rises and presses the gas in the first chamber 1 back into the second chamber 2 through the exhaust passage 32. Until the liquid level in the first chamber 1 rises to fill the first chamber 1, the shut-off valve core 33 blocks the exhaust passage 32, completely separating the first chamber 1 from the second chamber 2. During this process, by absorbing the high-pressure energy of the pressure-increasing wave with the pressurized gas in the second chamber 2, the pressure-increasing water hammer caused by the pressure-increasing wave can be eliminated. Thus, the water hammer elimination tank provided in this embodiment can automatically complete the water hammer protection work.

[0050] Specifically, in this embodiment, the cross-sectional area of the intake passage 31 is larger than that of the exhaust passage 32. Thus, when the pressure in the first chamber 1 decreases to a value such that the pressure difference between the second chamber 2 and the first chamber 1 is greater than a preset pressure difference, the intake passage 31 opens, and a large amount of gas in the second chamber 2 surges into the intake passage 31 and the exhaust passage 32, thereby enabling rapid pressure replenishment for the external water circuit. When the pressure in the first chamber 1 increases to a value such that the pressure difference between the first chamber 1 and the second chamber 2 is less than or equal to the preset pressure value, the intake passage 31 closes, and the gas in the first chamber 1 is only discharged through the exhaust passage 32. Since the cross-sectional area of the exhaust passage 32 is small, the gas in the first chamber 1 cannot be discharged quickly. Especially in the case where the liquid level in the first chamber 1 rises rapidly, such as when filling water into the water circuit and the water hammer elimination tank, since the air in the first chamber 1 can only be discharged slowly, a high-pressure airbag can be formed at the top of the first chamber 1, reducing the rising speed of the liquid level in the first chamber 1, thereby preventing the generation of pressure-increasing water hammer in the first chamber 1, protecting the water hammer elimination tank, and the shut-off valve core 33 can respond in a timely manner to close the exhaust passage 32 when the first chamber 1 is filled with water.

[0051] Wherein, the size and shape of the exhaust passage 32 are not limited herein. Optionally, the inner diameter of the exhaust passage 32 is in the range of 1.6 - 5 mm. If the inner diameter of the exhaust passage 32 is too large, the technical effect of fast inflow and slow discharge cannot be achieved. If the inner diameter of the exhaust passage 32 is too small, the air in the first chamber 1 cannot be discharged in time, easily leading to overpressure in the first chamber 1. Setting the exhaust passage 32 within the range of 1.6 - 5 mm can achieve the effect of fast inflow and slow discharge while ensuring the pressure-bearing reliability of the first chamber 1.

[0052] It should be noted that the preset pressure value is not limited herein, and those skilled in the art can freely select it according to requirements. In some embodiments, the preset pressure value can be set to 0, that is, when the pressure in the second chamber 2 is not greater than the pressure in the first chamber 1, the intake passage 31 closes; when the pressure in the second chamber 2 is greater than the pressure in the first chamber 1, the intake passage 31 opens. In other embodiments, a sealing valve flap 342 is provided at the intake passage 31, and the sealing valve flap 342 is pressed and sealed by an elastic member 343 (which can be a spring, for example). Therefore, as long as the pressure difference obtained by subtracting the pressure in the first chamber 1 from the pressure in the second chamber 2 can overcome the elastic force of the elastic member 343, the sealing valve flap 342 can be opened. Thus, those skilled in the art can adjust the preset pressure value by controlling the elastic force of the elastic member 343.

[0053] In this embodiment, first, the second chamber 2 is filled with pressurized gas. When the first chamber 1 is not filled with water, the first chamber 1 and the second chamber 2 are connected. When the first chamber 1 is filled with water, the first chamber 1 and the second chamber 2 are cut off. Thus, the pressure-increasing water hammer generated in the external water circuit can be absorbed and the pressure of the pressure-decreasing water hammer generated in the external water circuit can be compensated, playing a very good role in protecting the pipeline water hammer.

[0054] Then, by providing two channels with different cross-sections (the air intake channel 31 and the exhaust channel 32) to connect the first chamber 1 and the second chamber 2, and when a pressure-decreasing water hammer occurs in the external water circuit, the air intake channel 31 with a larger cross-section is kept open to ensure that the pressure in the external water circuit can be quickly and timely replenished. When a pressure-increasing water hammer occurs in the external water circuit, the air intake channel 31 with a larger cross-section is closed, while the exhaust channel 32 with a smaller cross-section is kept open. The gas in the first chamber 1 cannot be quickly discharged into the second chamber 2, thus avoiding the generation of a pressure-increasing water hammer due to the rapid rise of the liquid level and filling of the first chamber 1, and thus having a better protection effect on the pressure-increasing water hammer.

[0055] Finally, for the case where the liquid level in the first chamber 1 rises rapidly, such as when filling the water circuit and the water hammer eliminator tank, only exhaust air through the exhaust channel 32 with a smaller cross-section, which can reduce the rising speed of the liquid level in the first chamber 1. Thus, the shut-off valve element 33 can respond in time to close the exhaust channel 32 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.

[0056] Figures 4 - 7 Four different structures of the intake and exhaust unit 3 are illustrated by way of example. Hereinafter, Figures 4 - 7 The one-way air intake device 34 and the shut-off valve element 33 structures of the four different intake and exhaust units 3 will be described in more detail by way of example. Other structures not described are the same as those above and will not be elaborated here.

[0057] As Figures 4 - 7 shown, the one-way air intake device 34 is arranged at the air intake channel 31. The one-way air intake device 34 includes a valve seat 341, a sealing valve flap 342 and an elastic normally closed mechanism. Among them, the valve seat 341 is fixed in the air intake channel 31. A valve seat inlet is opened in the middle of the valve seat 341. The sealing valve flap 342 is arranged on the side of the valve seat 341 close to the first chamber 1 and is tightly sealed with the valve seat inlet. The elastic normally closed mechanism includes an elastic member 343 and a pull rod 344. The elastic member 343 is fixed on one side of the valve seat 341. One end of the pull rod 344 is fixed to the elastic member 343, and the other end passes through the valve seat inlet and is fixed to the sealing valve flap 342 so that the sealing valve flap 342 is tightly pressed against the valve seat inlet.

[0058] Specifically, when the pressure in the first chamber 1 rises to the point where the pressure difference between the second chamber 2 and the first chamber 1 is less than or equal to the elastic force of the elastic member 343 on the sealing valve flap 342, the elastic member 343 remains contracted, pressing the sealing valve flap 342 tightly against the valve seat inlet, and the intake passage 31 remains closed; when the pressure in the first chamber 1 drops to the point where the pressure difference between the second chamber 2 and the first chamber 1 is greater than the elastic force of the elastic member 343 on the sealing valve flap 342, the elastic member 343 stretches, and the sealing valve flap 342 leaves the valve seat 341, thereby opening the intake passage 31.

[0059] The shut-off valve core 33 includes a valve flap 331 and a floating body 332. Among them, a floating ball is taken as an example in the drawings for illustration, and floating bodies 332 of other shapes are also applicable to the present invention. Among them, an exhaust port 321 is provided in the exhaust passage 32, and the valve flap 331 is arranged on the side of the exhaust port 321 facing the direction of gravity. The floating body 332 is linked with the valve flap 331 and applies its own gravity to the valve flap 331. When the liquid level rises to the position where the floating body 332 is located, the floating body 332 rises with the liquid level, driving the valve flap 331 to press tightly against the exhaust port 321. This shut-off valve core 33 can automatically respond to the rising liquid level, without the need for additional communication control, with a fast response speed and a low failure risk.

[0060] As Figure 2 and 4 shown, the intake passage 31 and the one-way intake unit can be arranged in the first housing 35, the shut-off valve core 33 and the exhaust passage 32 can be arranged in the second housing 36, and the bottom of the first housing 35 is communicated with the first chamber 1, the top of the first housing 35 is communicated with the second chamber 2, and the middle and lower parts of the second housing 36 are communicated with the middle and lower parts of the first housing 35 through a connecting pipe 37, and the top of the second housing 36 is communicated with the top of the first housing 35 through a bypass pipe 38. Thus, the one-way intake unit and the shut-off valve core 33 can be separately repaired and replaced, which is more convenient for later maintenance.

[0061] As Figure 5 shown, the intake passage 31 and the one-way intake unit, the exhaust passage 32 and the shut-off valve core 33 can also be arranged in the first housing 35. Among them, the exhaust passage 32 is formed in a way that penetrates the sealing valve flap 342, and the shut-off valve core 33 is arranged on the side of the sealing valve flap 342 facing the direction of gravity corresponding to the exhaust passage 32. The intake passage 31, the exhaust passage 32, the one-way intake unit and the shut-off valve core 33 are integrated in the same housing, so that only the two ends of the housing need to be directly installed in the connecting pipeline between the first chamber 1 and the second chamber 2 through two flanges, which is convenient for installation and the structure is more compact.

[0062] For the case where the water hammer elimination tank has only one tank body, and the first chamber 1 and the second chamber 2 are separated by a partition 4, as Figure 6As shown, through holes can be formed in the partition plate 4 as the intake passage 31, and the exhaust passage 32 is formed in a way that penetrates the sealing valve flap 342. As Figure 7 shown, through holes with two different inner diameters can also be formed in the partition plate 4 as the intake passage 31 and the exhaust passage 32. The one-way intake unit is correspondingly arranged at the intake passage 31, and the shut-off valve core (33) is arranged in the exhaust passage (32), without the need to additionally provide a pressure-bearing housing, and the structure is simple.

[0063] 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 in 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), and positive pressure gas is filled inside the second chamber (2); An intake and exhaust unit (3) having an intake passage (31) and an exhaust passage (32), the first chamber (1) and the second chamber (2) are communicated via the intake passage (31) and the exhaust passage (32), and the cross-sectional area of the intake passage (31) is larger than the cross-sectional area of the exhaust passage (32). When the difference between the pressure of the second chamber (2) and the pressure of the first chamber (1) is not greater than a preset pressure difference, the intake passage (31) is closed; when the difference between the pressure of the second chamber (2) and the pressure of the first chamber (1) is greater than the preset pressure difference, the intake passage (31) is opened. The intake and exhaust unit (3) further includes a shut-off valve core (33) disposed at the exhaust passage (32), and when the first chamber (1) is filled with liquid, the exhaust passage (32) is closed.

2. The water hammer elimination tank according to claim 1, wherein The intake and exhaust unit (3) includes a one-way intake device (34), and the one-way intake device (34) is disposed at the intake passage (31), and the one-way intake device (34) includes: A valve seat (341) fixed inside the intake passage (31), and a valve seat inlet is opened in the middle of the valve seat (341); A sealing valve flap (342) disposed on the side of the valve seat (341) close to the first chamber (1), and is pressed and sealed with the valve seat inlet; An elastic normally closed mechanism, including an elastic member (343) and a pull rod (344), the elastic member (343) is fixed on one side of the valve seat (341), one end of the pull rod (344) is fixed to the elastic member (343), and the other end is fixed to the sealing valve flap (342) so that the sealing valve flap (342) is pressed against the valve seat inlet.

3. The water hammer elimination tank according to claim 2, characterized in that, The inner diameter of the exhaust passage (32) is 1.6 - 5 mm.

4. The water hammer elimination tank according to claim 2, characterized in that, The shut-off valve core (33) includes: a valve flap (331), an exhaust port (321) is provided in the exhaust passage (32), and the valve flap (331) is disposed on the side of the exhaust port (321) facing the direction of gravity; A floating body (332) is linked with the valve flap (331) and applies its own gravity to the valve flap (331). When the liquid level rises to the position where the floating body (332) is located, the floating body (332) rises with the liquid level and drives the valve flap (331) to be pressed against the exhaust port (321).

5. The water hammer elimination tank according to claim 4, characterized in that The exhaust passage (32) is formed in a way that penetrates the sealing valve flap (342), and the shut-off valve core (33) is correspondingly disposed on the side of the sealing valve flap (331) facing the direction of gravity with respect to the exhaust passage (32).

6. The water hammer elimination tank according to any one of claims 1-5, characterized in that, Further comprising: A pressure regulating unit, communicated with the pressure regulating port (21), for filling / venting gas into the second chamber (2) to adjust the pressure inside the second chamber (2).

7. The water hammer elimination tank according to claim 6, characterized in that, It includes a tank body, and the first chamber (1) and the second chamber (2) are separated by a partition plate (4) inside the tank body.

8. The water hammer elimination tank according to claim 6, characterized in that, It includes a separately provided first tank (5) and a second tank (6). The interior of the first tank (5) is the first chamber (1), and the interior of the second tank (6) is the second chamber (2). The first tank (5) and the second tank (6) are connected through an intake and exhaust pipeline (7), and the intake and exhaust unit (3) is arranged at the intake and exhaust pipeline (7).

9. The water hammer elimination tank according to claim 8, wherein The first tank (5) and the second tank (6) are arranged vertically along the gravity direction, and the second tank (6) is arranged above the first tank (5); Alternatively, the first tank (5) and the second tank (6) are arranged adjacent to each other horizontally.

10. The water hammer elimination tank according to any one of claims 1-5, characterized in that, It further includes: A safety valve (8) which is respectively and correspondingly connected and communicated with the first chamber (1) and the second chamber (2).

Images