Negative pressure tank and emergency spraying system

Abstract

The utility model belongs to the technical field of safety protection of gas collection stations in mountainous areas, and particularly relates to a negative pressure tank and an emergency spraying system. The negative pressure tank comprises a tank body, a water inlet and a water outlet, the water inlet and the water outlet are communicated with the tank body, a partition plate is arranged in the tank body and divides an inner cavity of the tank body into a first cavity used for being communicated with the conveying pump through the water outlet and a second cavity communicated with the water inlet, and the volume of the first cavity is larger than that of the second cavity. And an overflowing channel for communicating the first chamber with the second chamber is arranged on the partition plate or between the partition plate and the top of the tank body. The inner cavity of the tank body is divided into the first cavity and the second cavity through the partition plate, so that the volume of the first cavity is larger than that of the second cavity, the pumping-out phenomenon of the conveying pump during water conveying is avoided, and the water conveying continuity is improved; during working, water flows through the second cavity and then is injected into the first cavity through the flow channel, water flow impact is relieved, the liquid impact phenomenon is avoided, then stable liquid flow can be provided for the downstream, and the continuous conveying stability of water conveying is improved.

Description

Technical Field

[0001] The utility model belongs to the technical field of safety protection of gas gathering stations in mountainous areas, and specifically relates to a negative pressure tank and an emergency spraying system. Background Art

[0002] The emergency sprinkler system is an important safety protection facility for high-sulfur natural gas gathering stations. For gas gathering stations built at high altitudes in mountainous areas, their valve control systems, centrifugal pumps, water storage tanks (i.e., negative pressure tanks), water pools and other equipment and facilities are mostly installed at low altitudes in the mountainous areas. Fire emergency sprinkler heads are connected to centrifugal pumps and other components through pipes and valves. When a sudden fire or high-sulfur natural gas leaks at a gas gathering station, the centrifugal pump must be remotely started at the gas gathering station to transport the water in the water pool to the high-altitude gas gathering station in the shortest possible time. Emergency sprinklers are used to extinguish fires, reduce temperatures, and dilute high-sulfur hydrogen natural gas, thereby reducing personal injury, property losses, and environmental pollution caused by accidents.

[0003] In the existing emergency sprinkler system used in mountainous areas, due to the large height difference between the fire emergency sprinkler head and equipment and facilities such as centrifugal pumps and water pools, the liquid reflux force in the pipeline is large after the pump is stopped. At the same time, emergency sprinklers are mostly in a long-term pump-stop waiting state. Although a one-way valve is set in the pipeline to block the reflux, the one-way valve seal will age and fail in the long-term shutdown state, resulting in leakage, causing the water in the pipeline to gradually flow back to the pool through the centrifugal pump through the water tank. In the long-term pump-stop liquid reflux state, the centrifugal pump is easy to enter the air, resulting in the need to add water to the water tank before starting the centrifugal pump each time, causing the centrifugal pump to be unable to start automatically, and thus unable to start the pump remotely and quickly; after stopping the pump, the outlet valve of the centrifugal pump is generally closed to prevent water from flowing back into the pool, and the outlet valve needs to be opened on site before the next pump is started. In summary, in the current emergency sprinkler system, it is necessary to perform the operation of priming the pump or opening the control valve on site before starting the pump. The process is cumbersome, the operation time is long and labor-intensive, and there is a risk of long emergency response time.

[0004] In order to avoid the pump priming operation before each use of the centrifugal pump, the Chinese utility model patent with authorization announcement number CN212672064U and authorization announcement date March 9, 2021 discloses a vacuum water suction auxiliary device for a centrifugal pump, including a water storage tank, the lower part of the water storage tank is connected to the water inlet pipe of the centrifugal pump, the upper part of the water storage tank is connected to the upper end of the water pumping pipe, the lower end of the water pumping pipe is directly connected to the water pool, a water supply pipe is installed on the top surface of the water storage tank, the water supply pipe is connected to the water supply pipeline, a water supply valve is installed in the water supply pipe, and an exhaust valve is also installed on the top surface of the water storage tank.

[0005] However, in the above scheme, since the water outlet of the pumping pipe is located at the upper part of the tank body, after the pump is started normally, there is a large height difference between the pumped water and the liquid level in the tank body, which will cause impact on the water body in the tank body and form liquid hammer phenomenon, which can easily cause large fluctuations in the liquid level, thereby causing the water flow entering the centrifugal pump to be unstable, thereby affecting the continuous delivery stability of the centrifugal pump, and causing fluctuations in the operating current, affecting the service life of the power supply line. Utility Model Content

[0006] The purpose of the utility model is to provide a negative pressure tank to solve the problem that the water flow of the centrifugal pump is unstable due to the liquid hammer phenomenon caused by the water discharge of the water pumping pipe impacting the water in the tank body, thereby affecting the poor continuous delivery stability of the centrifugal pump and the fluctuation of the operating current. The purpose of the utility model is also to provide an emergency sprinkler system to solve the same problem as above.

[0007] In order to achieve the above purpose, the negative pressure tank in the utility model adopts the following technical solutions:

[0008] A negative pressure tank comprises a tank body and a water inlet and a water outlet connected to the tank body, wherein a partition is arranged inside the tank body, and the partition divides the inner cavity of the tank body into a first chamber for connecting with a delivery pump through the water outlet and a second chamber connected with the water inlet, wherein the volume of the first chamber is greater than the volume of the second chamber, and a flow channel for connecting the first chamber and the second chamber is arranged on the partition or between the partition and the top of the tank body.

[0009] Furthermore, the tank body includes a cylindrical section and a semicircular body portion, and the height of the partition does not exceed the height of the cylindrical section.

[0010] Furthermore, the central axes of the water inlet and the water outlet are at the same height.

[0011] Furthermore, the first chamber and the second chamber are both equipped with a drain valve.

[0012] Furthermore, a liquid level gauge is installed on the outer wall of the tank body.

[0013] Furthermore, a pressure gauge is provided on the tank body.

[0014] The beneficial effect of the utility model is that: the utility model is based on the improvement of the existing technology, by arranging a partition in the tank body of the negative pressure tank to separate the inner cavity of the tank body into a first chamber connected to the water outlet and a second chamber connected to the water inlet, and the volume of the first chamber is larger than the volume of the second chamber, and the first chamber and the second chamber are connected through a flow channel arranged on the partition or between the partition and the top of the tank body. After the pump priming operation is performed for the first time, since the volume of the first chamber is larger than that of the second chamber, when the pump is started again, the delivery pump can first extract the water in the first chamber, and then form a negative pressure in the negative pressure tank under the suction action of the delivery pump, so that water is continuously supplied to the negative pressure tank from the external water source, thereby avoiding the delivery pump from being evacuated when delivering water, thereby ensuring the continuity of water delivery; when in use, the water entering from the water inlet flows through the second chamber through the partition barrier, and then flows over the partition into the first chamber, thereby slowing down the impact of the water flow, thereby avoiding the occurrence of liquid hammer, and thereby providing a stable liquid flow for the downstream delivery pump, thereby improving the continuous delivery stability of the delivery pump, thereby also avoiding fluctuations in the operating current; after the pump is stopped, the partition can prevent the liquid from flowing back, thereby blocking and forming effective water storage in the first chamber, so that the centrifugal pump is filled with liquid, and then there is no need to perform pump priming when the centrifugal pump is started again, thereby improving the pump starting efficiency.

[0015] In order to achieve the above purpose, the emergency sprinkler system in the utility model adopts the following technical solutions:

[0016] An emergency sprinkler system comprises a water reservoir, a negative pressure tank, a centrifugal pump, a sprinkler head and a connecting pipeline. The negative pressure tank comprises a tank body and a water inlet and a water outlet which are connected to the tank body. A partition is arranged in the tank body. The partition divides the inner cavity of the tank body into a first chamber which is connected to a delivery pump through the water outlet and a second chamber which is connected to the water inlet. The volume of the first chamber is greater than that of the second chamber. A flow passage which is used to connect the first chamber and the second chamber is arranged on the partition or between the partition and the top of the tank body.

[0017] Furthermore, the tank body includes a cylindrical section and a semicircular body portion, and the height of the partition does not exceed the height of the cylindrical section.

[0018] Furthermore, the central axes of the water inlet and the water outlet are at the same height.

[0019] Furthermore, the first chamber and the second chamber are both equipped with a drain valve.

[0020] Furthermore, a liquid level gauge is installed on the outer wall of the tank body.

[0021] Furthermore, a pressure gauge is provided on the tank body.

[0022] Furthermore, the connecting pipeline includes a water supply pipeline connecting the centrifugal pump to the sprinkler head, and a check valve is provided in the water supply pipeline.

[0023] Furthermore, the connecting pipeline also includes an overflow pipeline connecting the water delivery pipeline and the water reservoir, and an overflow valve is provided in the overflow pipeline.

[0024] Furthermore, the connecting pipeline also includes a bypass pipeline connecting the water delivery pipeline and the water reservoir, and a bypass valve is provided in the bypass pipeline.

[0025] The beneficial effects of the utility model are as follows: the utility model is improved based on the prior art, and the inner cavity of the tank body is divided into a first chamber and a second chamber by a partition, and the volume of the first chamber is made larger than that of the second chamber, thereby avoiding the phenomenon of emptying the delivery pump when delivering water, and ensuring the continuity of the water delivery; when working, it first flows through the second chamber and then enters the first chamber through the flow channel, which slows down the impact of the water flow, thereby avoiding the occurrence of liquid hammer, and further can provide a stable liquid flow for the downstream delivery pump, improve the continuous delivery stability of the delivery pump, and further avoid the fluctuation of the operating current; after stopping the pump, the partition can be used to block and form effective water storage in the first chamber, so that the centrifugal pump is filled with liquid, and then when the centrifugal pump is started again, there is no need to implement pump filling, which improves the subsequent pump start-up efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 It is a structural schematic diagram of the emergency sprinkler system in the utility model.

[0027] In the figure: 100, gas gathering station; 1, water storage tank; 2, filter; 3, first check valve; 4, negative pressure tank; 5, centrifugal pump; 6, second pressure gauge; 7, outlet valve; 8, second check valve; 9, bypass valve; 10, sprinkler head; 11, control switch; 12, overflow valve; 13, control cabinet; 14, first pipeline; 15, bypass pipeline; 16, overflow pipeline; 17, second pipeline;

[0028] 401. Partition; 402. Water filling valve; 403. First chamber; 404. Second chamber; 405. Liquid level gauge; 406. First pressure gauge; 407. First drain valve; 408. Air outlet valve; 409. Second drain valve; 410. Water outlet flange; 411. Water inlet flange. DETAILED DESCRIPTION

[0029] The features and performance of the present invention are further described in detail below in conjunction with the embodiments.

[0030] The utility model provides a negative pressure tank, which divides the inner cavity of the tank body into a first chamber and a second chamber by a partition, and makes the volume of the first chamber larger than that of the second chamber, thereby avoiding the phenomenon of emptying the delivery pump when delivering water, and ensuring the continuity of the delivered water; when working, the water first flows through the second chamber and then enters the first chamber through the flow channel, which slows down the impact of the water flow, thereby avoiding the occurrence of liquid hammer, and further can provide a stable liquid flow for the downstream delivery pump, improve the continuous delivery stability of the delivery pump, and avoid the fluctuation of the operating current; after stopping the pump, the partition can prevent the water in the pipeline and the pump from flowing back, thereby blocking the formation of effective water storage in the first chamber with a liquid level higher than the partition, so that the centrifugal pump is filled with liquid, and then there is no need to implement pump filling when the centrifugal pump is started again, thereby improving the subsequent pump starting efficiency.

[0031] Embodiment of the emergency sprinkler system in the utility model:

[0032] like Figure 1 As shown, in this embodiment, the emergency sprinkler system includes a water reservoir 1, a negative pressure tank 4, a delivery pump and a sprinkler head 10.

[0033] Among them, the delivery pump is a centrifugal pump 5, the water reservoir 1 arranged at a low position is connected to the water inlet of the negative pressure tank 4 through the first pipeline 14, the water outlet of the negative pressure tank 4 is connected to the centrifugal pump 5, the centrifugal pump 5 is connected to the sprinkler head 10 arranged in the high-position gas gathering station 100 through the second pipeline 17, and the centrifugal pump 5 delivers water to the sprinkler head 10 through the second pipeline 17; the emergency sprinkler system also includes a remote control switch 11 arranged in the gas gathering station 100 and a control cabinet 13 arranged next to the water reservoir 1, and the remote control switch 11 is controlled by the control cabinet 13 to connect to the centrifugal pump 5.

[0034] In the first pipeline 14 from the water reservoir 1 to the negative pressure tank 4, a filter 2 for filtering impurities in the water reservoir 1 and a first check valve 3 for preventing backflow are arranged along the water flow direction.

[0035] In the second pipeline 17 from the centrifugal pump 5 to the sprinkler head 10, an outlet valve 7 for controlling the water delivery of the centrifugal pump 5 and a second check valve 8 for preventing backflow are also arranged in sequence; a second pressure gauge 6 is also arranged in the second pipeline 17 between the outlet valve 7 and the centrifugal pump 5 to monitor the pressure in the second pipeline 17.

[0036] The second pipeline 17 is also connected to the bypass pipeline 15 and the overflow pipeline 16 .

[0037] Among them, one end of the bypass pipeline 15 is connected to the second pipeline 17, and the other end is connected to the water reservoir 1. A bypass valve 9 is provided on the bypass pipeline 15, which is used to open the bypass valve 9 to return water to the water reservoir 1 during maintenance or debugging of the pipeline pressure.

[0038] The overflow pipeline 16 is arranged in parallel with the bypass pipeline 15, one end of the overflow pipeline 16 is connected to the second pipeline 17, and the other end is connected to the water reservoir 1. The overflow pipeline 16 is provided with an overflow valve 12, which is used to automatically open the overflow valve 12 to discharge the water in the second pipeline 17 into the water reservoir 1 when the pressure of the second pipeline 17 increases due to accidental closure or blockage of the sprinkler head 10. When the pressure of the second pipeline 17 exceeds the set value, the overflow valve 12 is automatically opened to discharge the water in the second pipeline 17 into the water reservoir 1, thereby reducing the pressure of the second pipeline 17 and the second check valve 8 and other components.

[0039] The negative pressure tank 4 is a vertical negative pressure tank 4, which includes a tank body and a water inlet and a water outlet connected to the tank body. Specifically, the tank body includes a lower cylindrical section and an upper semicircular section. The semicircular section and the cylindrical section are sealed and connected to form a pressure tank body. A water inlet flange 411 and a water outlet flange 410 connected to the inner cavity of the tank body are respectively arranged at relative positions on both sides of the bottom of the tank body. The water inlet flange 411 constitutes the water inlet of the tank body, and the water outlet flange 410 constitutes the water outlet of the tank body.

[0040] In this embodiment, a partition 401 is provided in the tank body, and the partition 401 divides the inner cavity of the tank body into a first chamber 403 connected to the centrifugal pump 5 through the water outlet flange 410 and a second chamber 404 connected to the water inlet flange 411. The first chamber 403 and the second chamber 404 are connected through a flow passage provided between the partition 401 and the top of the tank body. The first chamber 403 and the second chamber 404 are connected through the flow passage, so that the water flowing in from the water inlet flange 411 will first flow through the second chamber 404 until its liquid level reaches the flow passage, and then be injected into the first chamber 403 through the flow passage, which slows down the impact of water flow, thereby avoiding the occurrence of liquid hammer phenomenon, and then can provide a stable liquid flow for the downstream centrifugal pump 5, improve the continuous delivery stability of the centrifugal pump 5, and avoid the fluctuation of the operating current.

[0041] In this embodiment, the height of the partition 401 does not exceed the height of the cylindrical section of the tank body. Specifically, the height of the partition 401 is consistent with the height of the cylindrical section. In this way, a gap is formed between the partition 401 and the inner wall of the semicircular body, and the gap constitutes a flow passage. The gap facilitates the air in the tank body to gather at the top of the tank body, and at the same time, it is also convenient for water to flow from the second chamber 404 to the first chamber 403 through the gap. Setting the height of the partition 401 to be equal to the height of the cylindrical section facilitates setting the volume of the first chamber 403 and the second chamber 404.

[0042] As another embodiment, the upper end of the partition is directly connected to the inner wall of the semicircular body of the tank, and a flow hole is set at a position at the same height as the cylindrical section. The flow hole can be a long hole or a circular hole that passes through the partition along the thickness direction of the partition; of course, the shape of the flow hole can be any geometric shape, and the size of the flow hole can be set as needed, which is not limited in this embodiment. It should be noted that the total area of ​​all flow holes is greater than or equal to the cross-sectional area of ​​the water outlet to ensure that the amount of water injected into the first chamber through the second chamber is sufficient for the centrifugal pump to use, so as to avoid the centrifugal pump from being emptied when conveying water.

[0043] In this embodiment, the volume of the first chamber 403 is greater than that of the second chamber 404. Specifically, the volume of the first chamber 403 is greater than the sum of the volumes of the second chamber 404 and the first pipeline 14 between the inlet flange and the water surface of the water reservoir 1. After the first priming operation, since the volume of the first chamber 403 is greater than that of the second chamber 404, when the pump is started again, it is ensured that there is enough water in the first chamber 403 to supply the centrifugal pump 5. The centrifugal pump 5 can first extract the water in the first chamber 403, and then under the suction action of the centrifugal pump 5, a negative pressure is formed in the negative pressure tank 4, so that water is continuously supplied from the water reservoir 1 to the negative pressure tank 4 through the first pipeline 14, avoiding the centrifugal pump 5 from being evacuated when conveying water, thereby ensuring the continuity of water conveyance.

[0044] In this embodiment, the partition 401 is located at 1 / 3 between the water inlet flange 411 and the water outlet flange 410, and is close to the water inlet flange 411. Of course, in other embodiments, the partition 401 is located between the water inlet flange 411 and the water outlet flange 410 and is close to 2 / 5 of the water inlet flange 411. It should be understood that the specific position of the partition 401 is reasonably determined according to the volume of the tank body and the amount of water required for the centrifugal pump 5 to restart the pump. Setting the position of the partition 401 close to the water inlet flange 411 helps to weaken the impact force of the incoming water through the partition 401. At the same time, since the volume of the second chamber 404 is relatively small, it can ensure that the incoming water quickly passes through the second chamber 404 and overflows the partition 401 into the first chamber 403.

[0045] In this embodiment, the central axes of the water inlet flange 411 and the water outlet flange 410 are at the same height. This can avoid a large height difference between the water inlet flange 411 and the water outlet flange 410, ensuring the stability of the water flow; at the same time, the structure of other existing water supply equipment connected to the negative pressure tank 4 can be kept unchanged. Of course, in other embodiments, the central axes of the water inlet flange 411 and the water outlet flange 410 may not be at the same height, and the height of the water inlet flange 411 is preferably such that no liquid hammer occurs, such as the position of the water inlet flange 411 is higher than the water outlet flange 410 but still lower than the height of the partition 401. The specific setting is reasonable according to actual needs, and this embodiment does not limit this.

[0046] In this embodiment, a water injection valve 402 and an air outlet valve 408 are provided on the semicircular body of the tank body. The water injection valve 402 is used to inject water into the tank body to perform the pumping operation when the centrifugal pump 5 is started for the first time; the air outlet valve 408 is provided at the top of the semicircular body of the tank body, and is used to discharge the air in the tank body of the negative pressure tank 4 during the pumping operation.

[0047] In this embodiment, a first pressure gauge 406 is further provided on the tank body, and the first pressure gauge 406 is used to monitor the negative pressure state in the tank body, thereby monitoring the working state of the emergency sprinkler system.

[0048] In order to facilitate observation of the state of water injection in the negative pressure tank 4, in this embodiment, a liquid level gauge 405 is installed on the outer wall of the negative pressure tank 4. Specifically, the liquid level gauge 405 is installed in the cylindrical section of the negative pressure tank 4 and is located in the outer wall area of ​​the first chamber 403 of the tank body. Of course, the liquid level gauge 405 can also be installed in the outer wall area of ​​the second chamber 404 of the tank body. The liquid level position in the negative pressure tank 4 can be easily obtained through the liquid level gauge 405, so as to judge whether the water injection state in the tank body meets the pump start requirement.

[0049] In order to facilitate maintenance of the negative pressure tank 4 , in this embodiment, a drain valve is arranged at the bottom of the negative pressure tank 4 . Specifically, a first drain valve 407 is arranged at the bottom of the first chamber 403 , and a second drain valve 409 is arranged at the bottom of the second chamber 404 .

[0050] like Figure 1 As shown, the use process of the emergency sprinkler system provided in this embodiment is as follows:

[0051] Before starting the centrifugal pump for the first time: close the first drain valve 407 of the first chamber 403 of the negative pressure tank 4 and the second drain valve 409 of the second chamber 404, open the water filling valve 402 and the exhaust valve on the top of the negative pressure tank 4, and inject water into the negative pressure tank 4 through the water filling valve 402, and the exhaust valve simultaneously discharges the air in the negative pressure tank 4 to the outside; judge the water filling status of the first chamber 403 by observing the liquid level gauge 405, until the first chamber 403 is filled with water, that is, the pump is filled, and close the water filling valve 402 and the exhaust valve.

[0052] Pump start-up status is allowed: the first drain valve 407 and the second drain valve 409 of the negative pressure tank 4 are both kept in a closed state, the liquid level meter 405 confirms that the first chamber 403 is filled with water, the water injection valve 402 and the exhaust valve on the top of the negative pressure tank 4 are both kept in a closed state, at the same time, the bypass valve 9 of the bypass pipeline 15 and the outlet valve 7 of the centrifugal pump 5 are both in a closed state, and the overflow valve 12 is in use.

[0053] Pump start-up debugging operation: Start the remote control switch 11, adjust the outlet valve 7 of the centrifugal pump 5 on site, adjust the opening of the sprinkler head 10, and ensure that the pressure and coverage of the second pipeline 17 of the sprinkler head 10 meet the requirements. After checking that the operating status is normal, close the remote control switch 11, and keep the outlet valve 7 and the sprinkler head 10 opening in the pre-open state after debugging, and the debugging is completed.

[0054] Formal commissioning status: the water injection valve 402 of the negative pressure tank 4 is closed, the first pressure gauge 406 of the negative pressure tank 4 is in commissioning status, the liquid level gauge 405 shows that the liquid level is slightly lower than the height of the partition 401, the negative pressure tank 4 is in a state where the pump can be started, the power indicator light of the control cabinet 13 is always on, the second pressure gauge 6 is in commissioning status, the outlet valve 7 and each sprinkler head 10 of the gas gathering station 100 are in pre-opening status; the pump can be regularly turned on during daily inspections.

[0055] During use, when the centrifugal pump 5 is started and the water in the centrifugal pump 5 is transported out, the water in the first chamber 403 is first extracted, and the water level in the first chamber 403 is lowered, thereby forming a negative pressure in the tank body. The air pressure in the tank body is lower than the atmospheric pressure of the liquid surface of the water reservoir 1. At this time, the water in the water reservoir 1 enters the negative pressure tank 4 through the first pipeline 14. When the water extracted by the centrifugal pump 5 reaches a balance with the water pumped into the negative pressure tank 4, the liquid level in the negative pressure tank 4 no longer decreases, and the water in the water reservoir 1 is continuously transported to the second pipeline 17 through the centrifugal pump 5. Due to the elevation difference between the gas gathering station 100 and the water reservoir 1, when the centrifugal pump 5 stops running, the water in the second pipeline 17 between the second check valve 8 and the centrifugal pump 5 continues to flow back to the first chamber 403 under the action of the backflow force. If the liquid level in the first chamber 403 is higher than the partition 401, the water in the first chamber 403 continues to flow back to the second chamber 404 until the liquid level in the first chamber 403 gradually stops being higher than the height of the partition 401. The backflow water is effectively blocked by the partition 403, and effective water storage is formed in the first chamber 403 for restarting the centrifugal pump 5 without the need for priming operation. At the same time, when the centrifugal pump 5 stops working, the backflow force in the second pipeline 17 is relatively large. Under the action of the second check valve 8, the backflow water passes through the overflow pipeline 16 and opens the overflow valve 12 to discharge to the water reservoir 1. When the pump is stopped for a long time, if the seal of the first check valve 3 fails, the water in the second chamber 404 will seep into the water reservoir 1 through the first check valve 3. However, due to the obstruction of the partition 403, there is still enough water stored in the first chamber 403 to keep the centrifugal pump 5 in the primed state, and there is no need to perform the prime operation when the pump is started again.

[0056] The emergency sprinkler system provided in the present embodiment only needs to inject water into the negative pressure tank 4 before the first use. After the pump is stopped, due to the barrier effect of the partition 401 of the negative pressure tank 4, the first chamber 403 of the negative pressure tank 4, the centrifugal pump 5 and the first pipeline 14 always retain effective water storage, thereby meeting the pump start-up requirements. At the same time, the openings of the outlet gate valve of the debugged centrifugal pump 5 and the sprinkler head 10 retain the preset openings. In case of emergency activation, the pump can be directly started remotely or on-site without the need to fill the water tank with water or open the control valve. Remote and rapid pump start-up in emergencies is achieved, the operation is simple, and the emergency response time is effectively reduced, thereby effectively reducing property losses, personal injuries and environmental pollution. At the same time, during operation, when water flows into the negative pressure tank 4, it first flows through the second chamber 404 before crossing the partition 401 and entering the first chamber 403, which reduces the hydraulic phenomenon and has a stabilizing effect on the water flow, thereby providing a stable water flow for the downstream centrifugal pump 5, improving the continuous delivery stability of the delivery pump, and improving the stability of the operating current, which helps to increase the service life of the control circuit.

[0057] Embodiment of the negative pressure tank in the utility model:

[0058] The purpose of this embodiment is to provide a negative pressure tank. Specifically, the structure of the negative pressure tank in this embodiment is consistent with the structure of the negative pressure tank in the embodiment of the emergency sprinkler system in the utility model, and will not be described in detail here.

[0059] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. The patent protection scope of the present invention shall be based on the claims. All equivalent structural changes made using the description and drawings of the present invention shall be included in the protection scope of the present invention.

Claims

1. A negative pressure tank, comprising a tank body and a water inlet and a water outlet connected to the tank body, characterized in that: A partition is provided in the tank body, which divides the inner cavity of the tank body into a first chamber for communicating with the delivery pump through the water outlet and a second chamber for communicating with the water inlet. The volume of the first chamber is greater than that of the second chamber. A flow channel for communicating the first chamber and the second chamber is provided on the partition or between the partition and the top of the tank body.

2. The negative pressure tank according to claim 1, characterized in that: The tank body comprises a cylindrical section and a semicircular body portion, and the height of the partition does not exceed the height of the cylindrical section.

3. The negative pressure tank according to claim 1 or 2, characterized in that: The central axes of the water inlet and the water outlet are at the same height.

4. The negative pressure tank according to claim 1 or 2, characterized in that: The first chamber and the second chamber are both equipped with a drain valve.

5. The negative pressure tank according to claim 1 or 2, characterized in that: The outer wall of the tank body is equipped with a liquid level meter.

6. The negative pressure tank according to claim 1 or 2, characterized in that: The tank body is provided with a pressure gauge.

7. An emergency sprinkler system, comprising a water reservoir, a negative pressure tank, a centrifugal pump, a sprinkler head and connecting pipes, characterized in that: The negative pressure tank is the negative pressure tank according to any one of claims 1 to 6.

8. The emergency sprinkler system according to claim 7, characterized in that: The connecting pipeline comprises a water supply pipeline connecting the centrifugal pump to the sprinkler head, and a check valve is arranged in the water supply pipeline.

9. The emergency sprinkler system according to claim 8, characterized in that: The connecting pipeline also includes an overflow pipeline connecting the water delivery pipeline and the water reservoir, and an overflow valve is arranged in the overflow pipeline.

10. The emergency sprinkler system according to claim 8, characterized in that: The connecting pipeline also includes a bypass pipeline connecting the water delivery pipeline and the water reservoir, and a bypass valve is arranged in the bypass pipeline.

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