Water hammer eliminating tank and water conveying pipeline system

Abstract

The invention discloses a water hammer eliminating tank and a water conveying pipeline system with the water hammer eliminating tank, which can quickly respond to and relieve the overpressure and negative pressure conditions of an external pipeline, and is lower in cost and higher in reliability due to the adoption of a liner-free design, and the safety problems of liner breakage and the like are avoided. The water hammer eliminating tank comprises a tank body, a valve, a liquid level detection device and a control unit. Wherein the tank body is provided with a first through hole and a second through hole, the first through hole is higher than the second through hole, the second through hole is used for being communicated with an external pipeline, and when the first through hole and the second through hole are both closed, the tank body is sealed. The valve corresponds to the first through hole, the liquid level detection device is used for detecting the liquid level height in the tank body, and the control unit is in communication connection with the liquid level detection device and the valve, receives the detection result of the liquid level detection device and controls the valve to open / close the first through hole according to the detection result of the liquid level detection device.

Description

Technical Field

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

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

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

[0004] Among them, the existing water hammer eliminator is usually a pressure tank with an elastic inner liner. By pre-filling the compressed gas with pressure between the inner liner and the tank body to squeeze the capsule inner liner, the inner liner can expand and absorb water when the pressure in the external pipeline is too high. When the pressure in the external pipeline is low, the compressed gas squeezes the inner liner to replenish 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 eliminator. On the other hand, the inner liner is at risk of rupture and damage when absorbing excessive pressure in the pipeline, resulting in failure of the water hammer eliminator to protect the pipeline. Summary of the invention

[0005] The present invention provides a water hammer elimination tank and a water delivery pipeline system, the purpose of which is to overcome the above-mentioned problems existing in the prior art.

[0006] To achieve this object, the present invention adopts the following technical solutions:

[0007] The first aspect of the present invention provides a water hammer elimination tank, comprising a tank body, a valve, a liquid level detection device and a control unit. The tank body has a first through hole and a second through hole, the first through hole is higher than the second through hole, the second through hole is used to communicate with an external pipeline, and the tank body is sealed when the first through hole and the second through hole are both closed. The valve is arranged corresponding to the first through hole, the liquid level detection device is used to detect the liquid level in the tank body, the control unit is connected to the liquid level detection device and the valve for communication, receives the detection result of the liquid level detection device, and controls the valve to open / close the first through hole according to the detection result of the liquid level detection device.

[0008] It should be noted that those skilled in the art will understand that the "valve" in the present invention can be any valve structure with the function of opening and closing the first through hole, for example, it can be a single valve structure with opening and closing functions, or it can be a valve group structure formed by a combination of multiple valves of the same type or different types, without limitation here.

[0009] As an optional technical solution, the control unit is configured as follows: when the liquid level detection device detects that the liquid level in the tank body reaches a first liquid level height, the control valve closes the first through hole; when the liquid level detection device detects that the liquid level in the tank body is lower than the first liquid level height, the control valve opens the first through hole, and the height of the first liquid level is not higher than the lowest point of the first through hole.

[0010] When the pressure in the external pipeline is too high, the fluid in the external pipeline enters the tank body through the second through hole, the liquid level rises, and the control unit obtains the detection signal of the liquid level detection device in real time or at a fixed time. When the liquid level detection device detects that the liquid level in the tank body rises to the first liquid level height, the control unit generates and sends an instruction to close the first through hole. The valve receives the instruction sent by the control unit and closes the first through hole. At this time, the first through hole is closed, and the second through hole is submerged by the fluid, so that a closed air cavity is formed above the liquid level, and the air in the air cavity can be continuously compressed to balance the excess pressure in the pipeline.

[0011] When the pressure in the external pipeline decreases or even negative pressure occurs, the compressed air squeezes the fluid in the tank body, and the fluid quickly flows out through the second through hole to replenish the pressure in the external pipeline. The control unit obtains the detection signal of the liquid level detection device in real time or at a fixed time. When the liquid level detection device detects that the liquid level in the tank body drops below the first liquid level height, the control unit generates and sends an instruction to open the first through hole. The valve receives the instruction sent by the control unit and opens the first through hole, and the gas enters the tank body to ensure the air pressure in the tank body, so that the fluid can continue to flow out to replenish the pressure of the external pipeline.

[0012] Only by detecting the liquid level height can the overpressure and reduction of the external fluid be controlled. The number of liquid level detection devices is reduced, which saves costs. It can ensure that when the air pressure in the tank body drops to atmospheric pressure, external air can be introduced to supplement the pressure. The pressure of the compressed air in the tank body can be utilized to the greatest extent, while keeping the fluid flowing out of the tank body continuously and smoothly.

[0013] As an optional technical solution, the water hammer elimination tank also includes a safety valve, which is arranged at the top of the tank body and communicates with the inside of the tank body. The safety valve can be opened when the pressure in the tank body is too high to release the excessive pressure in the tank body and avoid rupture caused by excessive pressure in the tank body.

[0014] As an optional technical solution, the control unit is also communicated with the safety valve, and the control unit is also configured to: when the liquid level detection device detects that the liquid level in the tank body reaches a second liquid level height, control the safety valve to open; when the liquid level detection device detects that the liquid level in the tank body is lower than the second liquid level height, control the safety valve to close, and the second liquid level height is greater than the first liquid level height.

[0015] When the pressure in the external pipeline is too high and the first through hole is closed, the liquid level in the tank body continues to rise, and the air cavity in the tank body is continuously compressed. In this case, if the air pressure in the air cavity in the tank body is too high, it may cause overpressure or even rupture of the tank body. Generally speaking, when the pressure in the tank body exceeds the critical value, the safety valve will open automatically, but there is also a certain risk of failure in the pressure detection in the tank body. On this basis, in order to further ensure the safety of the tank body and avoid overpressure of the tank body, the liquid level detection device is combined. When the liquid level detection device detects that the liquid level in the tank body is higher than the second liquid level height, it is considered that the compressed gas pressure in the air cavity has reached the critical value, and the control unit controls the safety valve to open, thereby ensuring the safe operation of the tank body through the dual judgment of pressure and liquid level height.

[0016] As an optional technical solution, the liquid level detection device includes a liquid level meter, which is arranged on one side of the outside of the tank body, the upper part of the liquid level meter is connected to the upper part of the tank body, and the lower part of the liquid level meter is connected to the lower part of the tank body. The liquid level meter can truly reflect the liquid level in the tank body, and the external liquid level meter allows the user to see the liquid level in the tank body more intuitively.

[0017] As an optional technical solution, the liquid level detection device also includes a liquid level sensor, which is arranged in the tank body or the liquid level gauge and can more accurately detect and send the liquid level height information in the tank body.

[0018] As an optional technical solution, the liquid level sensor is a displacement sensor, and the liquid level sensor is any one or more combinations of a magnetostrictive liquid level detector, a photoelectric liquid level sensor, an ultrasonic liquid level sensor, and a float type liquid level sensor.

[0019] As an optional technical solution, the liquid level detection device further includes a liquid level sensor, which is arranged on the inner wall of the tank body and / or the top of the liquid level gauge, and the transmitting end of the liquid level sensor faces downward. Thus, only one liquid level sensor is needed to detect the changes of the liquid level in the tank body at multiple heights.

[0020] As an optional technical solution, the valve is an electric butterfly valve, which can respond to the command of the control unit more quickly to open / close the first through hole.

[0021] The second aspect of the present invention further provides a water pipeline system, wherein the water pipeline system comprises a water hammer elimination tank according to any of the above technical solutions.

[0022] Beneficial effects of the present invention:

[0023] According to the water hammer elimination tank and water delivery pipeline system provided by the present invention, when the pressure in the external pipeline is too high, the fluid in the external pipeline enters the tank body through the second through hole, and the liquid level rises. According to the detection result of the liquid level detection device, the control unit can generate and send an instruction to close the first through hole. The valve receives the instruction sent by the control unit and closes the first through hole. At this time, the first through hole is closed and the second through hole is submerged by the fluid, thereby forming a closed air cavity above the liquid level. The air in the air cavity can be continuously compressed to balance the excess pressure in the pipeline.

[0024] When the pressure in the external pipeline decreases or even negative pressure occurs, the compressed air squeezes the fluid in the tank body, and the fluid quickly flows out through the second through hole to replenish the pressure in the external pipeline. The liquid level in the tank body decreases. According to the detection result of the liquid level detection device, the control unit can generate and send an instruction to open the first through hole. The valve receives the instruction sent by the control unit and opens the first through hole. The gas enters the tank body to ensure the air pressure in the tank body, so that the fluid can continue to flow out to replenish the pressure of the external pipeline. The water hammer elimination tank can automatically and quickly respond to alleviate the overpressure and pressure reduction of the external pipeline without manual operation. In addition, due to the use of a liner-free design, the cost is lower, safety issues such as liner rupture are avoided, and reliability is higher. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 It is a structural schematic diagram of a water hammer elimination tank provided in the first embodiment of the present invention.

[0026] Figure 2 Schematic diagram of a control module of a control unit in a second embodiment of the present invention.

[0027] Figure 3-6 It is a schematic diagram of the state change of a water hammer elimination tank provided by the second embodiment of the present invention.

[0028] Figure 7 It is a structural schematic diagram of a water hammer elimination tank provided in the third embodiment of the present invention.

[0029] Figure 8 It is a structural schematic diagram of a water hammer elimination tank provided in the fourth embodiment of the present invention.

[0030] Fig. 9 It is a structural schematic diagram of another water hammer elimination tank provided in the fourth embodiment of the present invention.

[0031] Description of reference numerals:

[0032] 100-external pipeline;

[0033] 1-tank body; 11-first through hole; 12-second through hole; 13-air cavity; 2-valve; 3-liquid level detection device; 31-liquid level gauge; 32-liquid level sensor; 4-control unit; 41-receiving module; 42-comparison module; 43-command module; 5-safety valve. DETAILED DESCRIPTION

[0034] The present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It is to be understood that the specific embodiments described herein are only used to explain the present invention, rather than to limit the present invention. It should also be noted that, for ease of description, only parts related to the present invention, rather than all structures, are shown in the accompanying drawings.

[0035] In the description of the present invention, unless otherwise clearly specified and limited, the terms "connected", "connected", and "fixed" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0036] In the present invention, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may include that the first and second features are in direct contact, or may include that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, a first feature being "above", "above" and "above" a second feature includes that the first feature is directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. A first feature being "below", "below" and "below" a second feature includes that the first feature is directly below and obliquely below the second feature, or simply indicates that the first feature is lower in level than the second feature.

[0037] In the description of this embodiment, the terms "upper", "lower", "left", "right" and other directions or positional relationships are based on the directions or positional relationships shown in the drawings, and are only for the convenience of description and simplification of operation, rather than indicating or implying that the device or element referred to must have a specific direction, be constructed and operate in a specific direction, and therefore cannot be understood as limiting the present invention. In addition, the terms "first" and "second" are only used to distinguish in the description and have no special meaning.

[0038] First embodiment

[0039] Figure 1Schematic diagram of the structure of a water hammer elimination tank provided by the first embodiment of the present invention. Figure 1 As shown, the water hammer elimination tank includes a tank body 1, a valve 2, a liquid level detection device 3 and a control unit 4. The valve 2 is used to control the opening and closing of the through hole on the upper part of the tank body 1, the liquid level detection device 3 is used to detect the liquid level in the tank body 1, and the control unit 4 is connected to the valve 2 and the liquid level detection device 3 for communication, and controls the opening and closing of the valve 2 according to the detection structure of the liquid level detection device 3.

[0040] Among them, the tank body 1 is a hollow normal pressure or pressure container. The material and structure of the tank body 1 are not limited here. Technical personnel in this field can choose according to needs. For example, the tank body 1 can be a cast iron tank body, a stainless steel tank body, a resin tank body, etc., and can also be vertical, horizontal or other irregular shapes. The above all belong to the protection scope of the present invention.

[0041] The tank body 1 has a first through hole 11 and a second through hole 12, and the second through hole 12 can be connected to the external pipeline 100. The arrangement positions, opening shapes and sizes of the first through hole 11 and the second through hole 12 are not limited here, and it is only necessary that the first through hole 11 is higher than the second through hole 12. The accompanying drawings show an example in which the first through hole 11 and the second through hole 12 are both opened on one side of the tank body 1, which is more convenient for processing and user operation.

[0042] In addition, when the first through hole 11 and the second through hole 12 are both closed, the tank body 1 is sealed. Those skilled in the art will appreciate that this does not limit the tank body 1 to have only the first through hole 11 and the second through hole 12. In other embodiments, the tank body 1 may also have other openings provided with sealing measures. In some implementations, the tank body 1 may also have an inspection hole with a sealing flange provided thereon. In this case, as long as the first through hole 11 and the second through hole 12 are both closed, the tank body 1 can be sealed; or in other implementations, the tank body 1 may also have a safety hole provided with a safety valve, which remains normally closed during normal use. As long as the first through hole 11 and the second through hole 12 are both closed, the tank body 1 can be sealed, all of which fall within the protection scope of the present invention.

[0043] Generally speaking, when the external pipeline 100 maintains normal pressure, a certain amount of fluid (usually liquid or solid-liquid mixture) is stored in the tank body 1, which submerges the second through hole 12, so that when the pressure of the external pipeline 100 decreases, water is supplied to the external pipeline 100 in time to replenish the pressure. When the first through hole 11 is closed and the second through hole 12 is submerged by the fluid, the air in the upper part of the tank body 1 cannot be discharged, forming a closed air cavity 13 (see attached Figure 4 ).

[0044] The valve 2 is arranged corresponding to the first through hole 11, and is used to control the opening and closing of the first through hole 11. The valve 2 can be directly arranged at the first through hole 11, or it can also be arranged on the pipe extending from the first through hole 11. In both cases, the valve 2 can control the opening and closing of the first through hole 11, and it belongs to the protection scope of the present invention. In this embodiment, the valve 2 can be any valve 2 structure with the function of opening and closing the first through hole 11, and can be a separate valve 2 structure with automatic opening and closing function (such as a gate valve, a butterfly valve, an air valve, a check valve, etc.), or it can also be a valve group structure formed by a combination of multiple valves of the same type or different types (such as a combination of an electric shut-off valve and a check valve, etc.), which is not limited here. Preferably, the valve 2 can use an electric butterfly valve, which can respond to the command of the control unit 4 more quickly to open / close the first through hole 11.

[0045] The liquid level detection device 3 is used to detect the liquid level in the tank body 1. Those skilled in the art can freely select the type of the liquid level detection device 3 according to the needs, for example, it can include any one or more combinations of a magnetostrictive liquid level detector, a photoelectric liquid level detector, an ultrasonic liquid level detector, and a float liquid level detector. The liquid level detection device 3 can be set on the outside of the tank body 1 to facilitate the user to observe the liquid level in the tank body 1 more intuitively. Alternatively, in other embodiments, the liquid level detection device 3 can also be set inside the tank body 1 to avoid damage due to bad weather, and the detection result is more accurate and reliable.

[0046] The control unit 4 is connected to the liquid level detection device 3 and the valve 2 in communication. The control unit 4 can be mounted on the water hammer elimination tank, or can be set separately from the tank body 1, which is not limited here. The control unit 4 can receive the detection result of the liquid level detection device 3 in real time or at a fixed time, and compare the detection result of the liquid level detection device 3 with the preset value, and generate a control instruction of "opening the first through hole 11" or "closing the first through hole 11" according to the comparison result, and send the control instruction to the valve 2. After the valve 2 receives the control instruction, it executes to open the first through hole 11 or close the first through hole 11.

[0047] For example, a preset liquid level value is stored in the control unit 4. The control unit 4 obtains the detection result of the liquid level in the tank 1 by the liquid level detection device 3 every 5 seconds, and the control unit 4 compares the detection result with the preset liquid level value. When the detection result of the liquid level detection device 3 is greater than or equal to the liquid level value, the control unit 4 generates a control instruction of "closing the first through hole 11" and sends the control instruction to the valve 2. The valve 2 receives the control instruction and closes the first through hole 11. When the detection result of the liquid level detection device 3 is less than the liquid level value, the control unit 4 generates a control instruction of "opening the first through hole 11" and sends the control instruction to the valve 2. The valve 2 receives the control instruction and opens the first through hole 11.

[0048] In another example, the control unit 4 stores two preset liquid level values ​​(a first height and a second height, the size relationship between the two is not limited). The control unit 4 obtains the detection result of the liquid level in the tank body 1 by the liquid level detection device 3 every 5 seconds. When the valve 2 is open, the control unit 4 compares the detection result with the preset first height. When the detection result of the liquid level detection device 3 is greater than or equal to the first height, the control unit 4 generates a control instruction of "closing the first through hole 11" and sends the control instruction to the valve 2. The valve 2 receives the control instruction and closes the first through hole 11. When the valve 2 is closed, the control unit 4 compares the detection result with the preset second height. When the detection result of the liquid level detection device 3 is less than the second height, the control unit 4 generates a control instruction of "opening the first through hole 11" and sends the control instruction to the valve 2. The valve 2 receives the control instruction and opens the first through hole 11.

[0049] The above two examples of control procedures of the control unit 4 both belong to the protection scope of the present invention.

[0050] Specifically, during the use of the water hammer elimination tank provided in this embodiment, when the pressure in the external pipeline 100 is too high, the fluid in the external pipeline 100 enters the tank body 1 through the second through hole 12, and the liquid level rises. According to the detection result of the liquid level detection device 3, the control unit 4 can generate and send an instruction to close the first through hole 11, and the valve 2 receives the instruction sent by the control unit 4 and closes the first through hole 11. At this time, the first through hole 11 of the tank body 1 is closed, and the second through hole 12 is submerged by the fluid, so that a closed air cavity 13 is formed above the liquid level, and the air in the air cavity 13 can be continuously compressed by the fluid entering the tank body 1, balancing the excess pressure in the external pipeline 100 until the pressure of the external pipeline 100 returns to normal.

[0051] When the pressure in the external pipeline 100 decreases or even forms a negative pressure, the compressed air in the air chamber 13 of the tank body 1 squeezes the fluid in the tank body 1, and the fluid quickly flows out through the second through hole 12 to supplement the pressure of the external pipeline 100. The liquid level in the tank body 1 decreases. According to the detection result of the liquid level detection device 3, the control unit 4 can generate and send an instruction to open the first through hole 11. The valve 2 receives the instruction sent by the control unit 4 and opens the first through hole 11, and gas enters the tank body 1 to ensure the air pressure in the tank body 1, so that the fluid can continuously flow out to supplement the pressure of the external pipeline 100 until the pressure of the external pipeline 100 returns to normal.

[0052] In this embodiment, the water hammer elimination tank can automatically respond to relieve the overpressure and depressurization conditions of the external pipeline 100, without manual control, which is more convenient. And due to the adoption of the non-inner-liner design, the cost is lower, avoiding safety problems such as the rupture of the inner liner, and the reliability is higher.

[0053] Second embodiment

[0054] On the basis of the first embodiment, the second embodiment of the present invention provides a more specific control process of the control unit 4.

[0055] Figure 2 It is a schematic diagram of the control module of the control unit in the second embodiment of the present invention. Combining Figure 1 and Figure 2 it can be seen that the control unit 4 at least includes: a receiving module 41, a comparison module 42 and an instruction module 43. Among them, the receiving module 41 is communicatively connected to the liquid level detection device 3 and is used to obtain the detection result H1 of the liquid level detection device 3 in real time or at regular intervals. The comparison module 42 stores a preset first liquid level height H2 and is used to compare the detection result H1 with the first liquid level height H2. The instruction module 43 generates a control instruction according to the comparison result of the comparison module 42. Specifically, when the detection result is greater than or equal to the first liquid level height (H1≥H2), a control instruction to close the first through hole 11 is sent to the valve 2; when the detection result is less than the first liquid level height (H1<H2), a control instruction to open the first through hole 11 is sent to the valve 2.

[0056] Hereinafter, combining Figure 1 and Figure 3-6 will be used to describe in detail the structural changes of the water hammer elimination tank provided in this embodiment during the water hammer prevention process.

[0057] Specifically, during the use of the water hammer elimination tank provided in this embodiment, first, as Figure 1 shown, when the pressure in the external pipeline 100 is too high, the fluid in the external pipeline 100 enters the tank body 1 through the second through hole 12, and the liquid level rises. At this time, the valve 2 keeps the first through hole 11 open. As Figure 3As shown in FIG. 1 , when the liquid level rises to the first liquid level, the control unit 4 generates and sends an instruction to close the first through hole 11, and the valve 2 receives the instruction sent by the control unit 4 and closes the first through hole 11. At this time, the first through hole 11 is closed, and the second through hole 12 is submerged by the fluid, so that a closed air cavity 13 is formed above the liquid level, as shown in FIG. Figure 4 As shown, the air in the air chamber 13 can be continuously compressed to balance the excess pressure in the pipeline.

[0058] like Figure 4 and Figure 5 As shown, when the pressure in the external pipeline 100 decreases or even a negative pressure occurs, the compressed air squeezes the fluid in the tank body 1, and the fluid quickly flows out through the second through hole 12 to supplement the pressure of the external pipeline 100. Figure 5 and Figure 6 As shown, when the liquid level detection device 3 detects that the liquid level in the tank body 1 drops below the first liquid level height, the control unit 4 generates and sends an instruction to open the first through hole 11, the valve 2 receives the instruction sent by the control unit 4, and opens the first through hole 11, and the gas enters the tank body 1 to ensure the air pressure in the tank body 1, so that the fluid can continue to flow out to replenish the pressure of the external pipeline 100.

[0059] In this embodiment, only one liquid level height needs to be detected to realize control over both overpressure and reduction of external fluid. The number of liquid level detection devices 3 is smaller, which saves cost and can ensure that when the air pressure in the tank body 1 drops to atmospheric pressure, external air can be introduced to supplement the pressure. The pressure of the compressed air in the tank body 1 can be utilized to the greatest extent while keeping the fluid flowing out of the tank body 1 continuously and smoothly.

[0060] Third embodiment

[0061] The third embodiment of the present invention further provides a water hammer elimination tank with a safety valve 5 on the basis of the first embodiment or the second embodiment. The remaining structures are the same as those of the first embodiment or the second embodiment and are not described in detail herein.

[0062] When the pressure in the external pipeline 100 is too high and the first through hole 11 is closed, the liquid level in the tank body 1 continues to rise, and the air cavity 13 in the tank body 1 is continuously compressed. In this case, if the air pressure in the air cavity 13 in the tank body 1 is too high, the tank body 1 may be over-pressurized or even ruptured.

[0063] In this regard, Figure 7 Schematic diagram of the structure of the water hammer elimination tank provided by the third embodiment of the present invention. Figure 7As shown, the water hammer elimination tank also includes a safety valve 5, which is arranged at the top of the tank body 1 and is connected to the inside of the tank body 1. The safety valve 5 can be opened when the pressure in the tank body 1 is too high to release the excessive pressure in the tank body 1 and avoid rupture caused by excessive pressure in the tank body 1.

[0064] Generally speaking, when the pressure in the tank body 1 exceeds the critical value, the safety valve 5 will automatically open, but there is also a certain risk of failure in the pressure detection in the tank body 1. On this basis, in order to further ensure the safety of the tank body 1 and avoid overpressure in the tank body 1, the control unit 4 is also connected to the safety valve 5 for communication. Furthermore, the control unit 4 is also configured to: when the liquid level detection device 3 detects that the liquid level in the tank body 1 reaches the second liquid level height H3, control the safety valve 5 to open; when the liquid level detection device 3 detects that the liquid level in the tank body 1 is lower than the second liquid level height H3, control the safety valve 5 to close, and the second liquid level height H3 is greater than the first liquid level height H2.

[0065] In this embodiment, when the liquid level detection device 3 detects that the liquid level in the tank body 1 is higher than the second liquid level height, it is considered that the compressed gas pressure in the air cavity 13 has reached a critical value, and the control unit 4 controls the safety valve 5 to open, thereby ensuring the safe operation of the tank body 1 through dual judgments of pressure and liquid level height.

[0066] Fourth embodiment

[0067] The fourth embodiment of the present invention provides a water hammer elimination tank structure with a more preferred liquid level detection device on the basis of the first embodiment, the second embodiment or the third embodiment, and the remaining structures are the same as the first embodiment, the second embodiment or the third embodiment, and will not be described in detail here.

[0068] Figure 8 Schematic diagram of the structure of a water hammer elimination tank provided by the fourth embodiment of the present invention. Figure 8 As shown, the liquid level detection device includes a liquid level meter 31 and a liquid level sensor 32. The liquid level meter 31 is arranged on one side outside the tank body 1, the upper part of the liquid level meter 31 is connected to the upper part of the tank body 1, and the lower part of the liquid level meter 31 is connected to the lower part of the tank body 1. The liquid level sensor 32 can be arranged in the tank body, or, in some preferred embodiments, the liquid level sensor 32 can be arranged in the liquid level meter 31.

[0069] In this embodiment, the liquid level gauge 31 can truly reflect the liquid level height in the tank body 1, and the external liquid level gauge 31 allows the user to more intuitively see the liquid level height in the tank body 1. Setting the liquid level sensor 32 in the liquid level gauge 31 also makes it easier to repair and replace the liquid level sensor 32.

[0070] The liquid level sensor 32 can be any one or more combinations of a magnetostrictive liquid level detector, a photoelectric liquid level sensor, an ultrasonic liquid level sensor, and a float liquid level sensor. Fig. 9 As shown, the liquid level sensor 32 can be a photoelectric liquid level sensor or an ultrasonic liquid level sensor, and the photoelectric liquid level sensor or the ultrasonic liquid level sensor can be set on the top inner wall of the tank body 1 and / or the liquid level meter 31, with the transmitting end facing downward. On the one hand, the photoelectric liquid level sensor or the ultrasonic liquid level sensor is more accurate in dynamically monitoring the rise and fall of the liquid level, and can quickly capture the rise and fall of the liquid level. In addition, only one photoelectric liquid level sensor or ultrasonic liquid level sensor is needed to detect all liquid level changes in the liquid level meter 31, and to obtain the changes of the liquid level in the tank body 1 at multiple heights.

[0071] In other embodiments of the present invention, a water pipeline system having a water hammer elimination tank in any of the above embodiments is also provided.

[0072] For example, the water delivery pipeline system may include a water suction pipe, a pump front valve, a water suction pump, a pump rear valve, a water delivery pipe, and a water delivery valve connected in sequence. The second through hole 12 of the water hammer elimination tank is connected to the downstream of the water suction pump.

[0073] In some cases, such as when the water suction pump stops unexpectedly, the pressure in the water pipe drops suddenly, and the fluid stored in the water hammer elimination tank is replenished into the water pipe through the second through hole 12 to compensate for the pressure drop caused by the pump stop. The liquid level in the water hammer elimination tank also continues to drop. When it drops to the first liquid level height H2, the air in the air cavity 13 is almost equal to the atmospheric pressure. The control unit 4 controls the valve 2 to open the second through hole 12, and air is replenished to ensure that the fluid can be continuously supplied to the water pipe.

[0074] In other cases, such as when the water valve is suddenly closed, the pressure in the water pipe rises suddenly, and the fluid in the water pipe enters the water hammer elimination tank through the second through hole 12, thereby absorbing the pressure increase in the water pipe caused by the sudden closing of the valve, and the liquid level in the water hammer elimination tank also rises accordingly. When it rises to the first liquid level height H2, the control unit 4 controls the valve 2 to close the second through hole 12, and a closed air cavity 13 is formed inside the tank body 1. The air cavity 13 can be continuously compressed to further absorb the excess pressure in the water pipe.

[0075] Obviously, the above embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the embodiments of the present invention. For those skilled in the art, various obvious changes, readjustments and substitutions can be made without departing from the protection scope of the present invention. It is not necessary and impossible to list all the embodiments here. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the claims of the present invention.

Claims

1. A water hammer elimination tank, characterized in that: include: A tank body (1) having a first through hole (11) and a second through hole (12), wherein the first through hole (11) is higher than the second through hole (12), and the second through hole (12) is used to communicate with an external pipeline (100); when the first through hole (11) and the second through hole (12) are both closed, the tank body (1) is sealed; A valve (2) disposed corresponding to the first through hole (11); A liquid level detection device (3) for detecting the height of the liquid level in the tank body (1); A control unit (4) is connected to the liquid level detection device (3) and the valve (2) for communication, receives a detection result of the liquid level detection device (3), and controls the valve (2) to open / close the first through hole (11) according to the detection result of the liquid level detection device (3).

2. The water hammer elimination tank according to claim 1, characterized in that: The control unit (4) is configured as follows: When the liquid level detection device (3) detects that the liquid level in the tank body (1) reaches a first liquid level height, the valve (2) is controlled to close the first through hole (11); When the liquid level detection device (3) detects that the liquid level in the tank body (1) is lower than the first liquid level height, the valve (2) is controlled to open the first through hole (11), The height of the first liquid level is not higher than the lowest point of the first through hole (11).

3. The water hammer elimination tank according to claim 2, characterized in that: Also includes: A safety valve (5) is arranged at the top end of the tank body (1) and is communicated with the interior of the tank body (1).

4. The water hammer relief tank according to claim 3, characterized in that: The control unit (4) is also in communication with the safety valve (5), and the control unit (4) is also configured to: When the liquid level detection device (3) detects that the liquid level in the tank body (1) reaches a second liquid level height, the safety valve (5) is controlled to open; When the liquid level detection device (3) detects that the liquid level in the tank body (1) is lower than the second liquid level height, the safety valve (5) is controlled to close. The second liquid level height is greater than the first liquid level height.

5. The water hammer elimination tank according to any one of claims 1 to 4, characterized in that: The liquid level detection device comprises: a liquid level meter (31) arranged on one side outside the tank body (1), the upper part of the liquid level meter (31) being connected to the upper part of the tank body (1), and the lower part of the liquid level meter (31) being connected to the lower part of the tank body (1).

6. The water hammer relief tank according to claim 5, characterized in that: The liquid level detection device further comprises: a liquid level sensor (32) arranged in the tank body (1) or the liquid level meter (31).

7. The water hammer relief tank according to claim 6, characterized in that: The liquid level sensor (32) is any one or more combinations of a magnetostrictive liquid level detector, a photoelectric liquid level sensor (32), an ultrasonic liquid level sensor (32), and a float type liquid level sensor (32).

8. The water hammer relief tank according to claim 5, characterized in that: The liquid level detection device further comprises: a liquid level sensor (32), wherein the liquid level sensor (32) is arranged on the top inner wall of the tank body (1) and / or the liquid level meter (31), and the transmitting end of the liquid level sensor (32) faces downward.

9. The water hammer relief tank according to any one of claims 1 to 4, characterized in that: The valve (2) is an electric butterfly valve.

10. A water pipeline system, characterized in that: A water hammer elimination tank as described in any one of claims 1 to 9.

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