Pressure limiting control mechanism and peak shifting water storage and supply system comprising same

Abstract

The utility model provides a pressure-limiting control mechanism and an off-peak water storage and supply system including the same, the pressure-limiting control mechanism includes: a first control valve including a first valve body, a valve core and a first piston movably arranged in the valve core, a piston cavity is formed between one end of the first piston and the inner wall of the valve core, and the other end is provided with a conduction hole communicated with a leading-in end and the piston cavity in a penetrating manner; the first piston blocks the water inlet end of the first valve body under the elastic action of the first elastic piece; the second control valve comprises a second valve body and a second piston which are respectively connected with the piston cavity and the water outlet end of the first valve body through a communication channel and a drainage channel, a guide hole communicated with the communication channel and the drainage channel is formed in the second valve body, the second piston comprises a plugging part and a pressed part which are arranged at an interval, and the water outlet end of the communication channel is located between the guide hole and the pressed part; and the second piston blocks the guide hole through the blocking part under the elastic action of the second elastic piece. The water storage work of the regulation and storage water tank can be controlled to be automatically started and stopped along with the pressure of a municipal pipe network in a mechanical control mode for peak shifting water storage.

Description

Technical Field

[0001] This utility model relates to the field of water storage and supply systems, specifically to a pressure limiting control mechanism and a peak-shaving water storage and supply system including the same. Background Technology

[0002] Municipal water supply networks connect households to provide water for daily life. Since residents' daily routines are largely similar, water consumption varies significantly across the entire city. To prevent water shortages during peak hours when municipal network pressure is low, which could disrupt cooking and bathing, residential communities and other densely populated areas typically have regulating water tanks. These tanks provide secondary water supply to residents during peak hours, alleviating water pressure and ensuring a stable water supply.

[0003] As for the water storage tank, not only does the water volume need to be adjusted according to parameters such as the occupancy rate of residents, the timing of water storage should also be preferred during the off-peak period of the municipal water supply network, so as to avoid storing water during the peak period of the municipal water supply network and competing for the water supply of the municipal water supply network, which would lead to a further drop in the water pressure of the municipal water supply network and affect the water use of other residents.

[0004] To address this, existing water storage tanks primarily rely on water pressure sensors to detect the water supply pressure of the municipal water network they are connected to, determining whether the network is operating during peak or off-peak periods. When the detected pressure exceeds a set value, it's considered an off-peak period, and the tank's inlet valve opens to store water. Conversely, when the pressure falls below the set value, it's considered a peak period, and the inlet valve closes, preventing water storage. However, due to the risk of sensor malfunction and misjudgment, it's difficult to ensure the tank stores water at the precise time, necessitating frequent manual maintenance and testing to maintain stability.

[0005] The research objective of this utility model is to design a pressure limiting control mechanism that can stably determine the timing of water storage in a water storage tank, and a staggered peak water storage and supply system including the aforementioned problems in the existing technology. Utility Model Content

[0006] To address the problems existing in the prior art, this utility model provides a staggered peak water storage and supply system, which can effectively solve the problems existing in the prior art.

[0007] The technical solution of this utility model is:

[0008] A pressure limiting control mechanism, comprising:

[0009] The first control valve includes a first valve body with an inlet end connected to the corresponding municipal pipe network and an outlet end connected to the inlet end of the corresponding regulating water tank, as well as a valve core disposed in the first valve body and a first piston movably disposed in the valve core. One end of the first piston forms a piston cavity with the inner wall of the valve core, and the other end is provided with a conduction channel connecting the inlet end and the piston cavity. The first piston is blocked at the inlet end of the first valve body by the elastic force of the first elastic element.

[0010] The second control valve includes a second valve body that connects the piston chamber and the outlet of the first valve body through a connecting channel and a drain channel, respectively, and a second piston movably disposed within the second valve body. The second valve body is provided with a guide hole connecting the connecting channel and the drain channel. The second piston includes a blocking part and a pressure receiving part spaced apart. The outlet of the connecting channel is located between the guide hole and the pressure receiving part. The second piston is subjected to the elastic force of a second elastic element and blocks the guide hole through the blocking part. The elastic force of the second elastic element is set to a limited pressure value.

[0011] The water flow and water pressure at the inlet end are sequentially transmitted through the conduction channel, piston chamber, and connecting channel to the guide hole and the pressure receiving part. When the water pressure at the inlet end is greater than the limited pressure value, the second piston is pressed away from the guide hole, and the first piston is disengaged from or blocks the water inlet end of the first valve body as the water pressure in the piston chamber changes.

[0012] Furthermore, an adjusting screw is screwed through the side wall of the second valve body, located on the side of the pressure-bearing part away from the guide hole. The inner end of the adjusting screw is provided with a limiting cover with an opening spacing corresponding to the pressure-bearing part. The second elastic element is a second spring with its two ends connected to the pressure-bearing part and the limiting cover respectively. The screwing depth of the adjusting screw is used to adjust the elastic force of the second spring.

[0013] Furthermore, the inner wall of the valve body is recessed and has a guide groove corresponding to the guide hole on the side away from the blocking part. The second piston also includes a guide rod with one end laterally sealed and slidably inserted into the guide groove and the other end laterally penetrating the guide hole. The blocking part and the pressure-bearing part are spaced apart at the other end of the guide rod in the direction away from the guide hole. The pressure-bearing part is a flexible sleeve that is connected to the inner wall of the second valve body on its outer periphery.

[0014] Furthermore, a pressure-bearing cavity is formed between the guide hole and the pressure-bearing part, and the pressure-bearing cavity includes a guide area whose inner diameter gradually increases toward the flexible sleeve.

[0015] Furthermore, the second valve body is sealed and fixed on the outer wall of the first valve body. The side wall of the valve core is provided with a connecting pipe that penetrates the side wall of the first valve body and the side wall of the second valve body. The connecting pipe forms the connecting channel. The side walls of the first valve body and the second valve body are respectively provided with drainage holes, and the two drainage holes form the drainage channel.

[0016] Furthermore, the valve core is provided with an opening on one side corresponding to the inlet end, and the other end of the first piston passes through the opening and extends toward the inlet end to form an elongated conductive portion, and the middle of the conductive portion is provided with an elongated conductive channel.

[0017] Furthermore, the inner end of the first piston is recessed to form an inner groove, and the first elastic element is configured as a first spring with one end connected to the inner groove and adapted to the inner diameter of the inner groove, and the other end gradually shrinking away from the bottom of the inner groove and connected to the middle of the inner wall of the valve core.

[0018] A peak-shaving water storage and supply system, characterized in that it includes:

[0019] The regulating water tank has an outlet for supplying water to residents.

[0020] As described above, in the pressure limiting control mechanism, the outlet end of the first valve body is connected to the inlet end of the regulating water tank.

[0021] Furthermore, it also includes a manual control valve and an electric regulating valve that are sequentially connected between the inlet end and the water inlet end of the first valve body and are used to control the opening and closing of the inlet end, respectively. The outlet end of the water storage tank is connected to the user's main pipeline through a variable frequency speed regulation water supply device.

[0022] Furthermore, an electromagnetic valve for controlling the opening and closing of the inlet of the regulating water tank is provided between the outlet end of the first valve body and the inlet end of the regulating water tank. A float valve that is communicatively connected to the electromagnetic valve is provided inside the regulating water tank. The regulating water tank is connected to a water level pressure sensor for detecting the water level and a drain electric valve for controlling drainage.

[0023] Therefore, the beneficial effects of this utility model are:

[0024] 1. By adding the first control valve and the second control valve, the water flow and pressure at the inlet end, i.e. the water flow and pressure of the municipal pipe network, can be transmitted sequentially through the transmission channel, piston chamber, and connecting channel to the guide hole and the pressure receiving part. When the water pressure at the inlet end is greater than the limit pressure value, it means that the water pressure of the municipal pipe network is relatively large, and it can be judged that the whole is in the low peak water use period. At this time, the second piston is pressed and overcomes the elastic force of the second elastic element and disengages from the guide hole. The connecting channel and the drainage channel are connected through the guide hole. The water flow flows through the drainage channel towards the outlet end of the second valve body, and then towards the inlet end of the regulating water tank. After the second piston opens, the first piston disengages from or blocks the inlet of the first valve body as the water pressure in the piston chamber changes. Specifically, when the storage tank needs to store water, the water flow from the drainage channel can be smoothly discharged to the outlet of the second valve body and then stored in the storage tank via the inlet. At this time, the water volume in the piston chamber decreases and the water pressure is less than that at the inlet. Therefore, the first piston is pressed against the elastic force of the first elastic element and disengages from the inlet of the first valve body. The inlet is connected to the inlet of the storage tank via the inlet and outlet of the first valve body to further store water in the storage tank. When the storage tank does not need to store water, since both the inlet and outlet of the storage tank are full of water, the drainage channel cannot drain water. At this time, the water volume in the piston chamber remains unchanged and the water pressure is not less than that at the inlet. Therefore, the pressure on both sides of the first piston is the same, and it still blocks the inlet of the first valve body. When the water pressure at the inlet is lower than the limit pressure value, it indicates that the municipal water network pressure is low, suggesting that the entire system is in a peak water usage period. At this time, the water pressure transmitted to the second valve body is insufficient to open the second piston, and the first piston will not open either. Therefore, the pressure limiting control mechanism remains closed, and the water storage tank stops storing water. By setting the pressure limiting control mechanism to a limit pressure value for the elastic force of the second elastic element, and then transmitting the water pressure at the inlet through the transmission channel, piston chamber, and connecting channel, the mechanical structure controls the opening and closing of the second piston based on the municipal water network pressure, which in turn controls the opening and closing of the first piston. Ultimately, this allows the water storage tank to automatically open and close according to the municipal water network pressure for off-peak water storage. This mechanical control method, which directly uses the water pressure at the municipal water network inlet as the trigger pressure for piston opening and closing, offers significantly greater stability compared to existing control methods that rely on pressure sensors. It greatly reduces the risk of misjudgment, ensures the water storage tank stores water at the precise time, and reduces maintenance difficulty.

[0025] 2. By adding adjusting screws and limit covers, the elastic force of the second spring can be adjusted by adjusting the screw depth. This allows for setting appropriate limit pressure values ​​based on the municipal water pressure values ​​in different regions. The elastic force of the second elastic element can then be adjusted to match the limit pressure value by adjusting the screws, thus making the staggered peak water storage and supply system applicable to different regions and improving its adaptability.

[0026] 3. By guiding the sliding of one end of the guide rod through the guide groove and flexibly limiting the other end of the guide rod with the flexible sleeve, the stability of the second piston during lateral sliding can be greatly improved, avoiding radial displacement when the second piston is pressed out of the guide hole, ensuring that it always slides in a straight lateral direction, thereby improving the stability of the second piston in sealing and opening the guide hole.

[0027] 4. By adding a guide zone, the water flow entering the pressure chamber can be mainly guided to squeeze the flexible sleeve, and the force-bearing area of ​​the flexible sleeve is increased. This avoids the water pressure driving force being excessively affected by the reaction force of the flexible sleeve, and improves the stability and accuracy of the water pressure acting on the pressure-bearing part.

[0028] 5. By directly connecting the first valve body and the second valve body, the length of the connecting channel and the drainage channel can be shortened to the maximum extent, thereby improving the efficiency of the water pressure at the inlet end being transmitted to the pressure chamber through the transmission channel, piston chamber, and connecting channel, improving the efficiency of the water flow in the second valve body being discharged to the outlet end of the second valve body through the drainage channel, and further improving the linkage efficiency between the first control valve and the second control valve, improving the overall opening and closing efficiency of the pressure limiting control mechanism controlled by the water pressure at the inlet end, and reducing the delay of peak water storage in the regulating water tank.

[0029] 6. By extending the length of the transmission channel, the water pressure at the inlet end gradually stabilizes after flowing through the transmission channel for a certain distance, ensuring stable water pressure entering the piston chamber. At the same time, it can prevent water from flowing into or out of the piston chamber quickly, which could cause sudden pressure changes in the piston chamber and damage to the first piston, thus improving the overall stability of the first control valve.

[0030] 7. By using the conical structure design of the first spring, the stability of the first piston when it disengages from the water inlet end of the first valve body is improved, avoiding the situation where the first piston opens rapidly and forms water hammer in the first valve body due to the high pressure at the inlet end, thus improving the stability of the first piston's movement and thereby improving the overall stability of the first control valve. Attached Figure Description

[0031] Figure 1 This is a schematic diagram of a peak-shaving water storage and supply system.

[0032] Figure 2 This is a cross-sectional structural diagram of a pressure limiting control mechanism.

[0033] Figure 3 for Figure 2 A schematic diagram of the structure when the water pressure at the inlet is greater than the limit pressure value and the water storage tank needs to store water, i.e., when both the first piston and the second piston are open.

[0034] Figure 4 for Figure 3A partially enlarged schematic diagram of the second control valve.

[0035] Figure 5 for Figure 2 A schematic diagram of the structure when the water pressure at the inlet is greater than the limit pressure value and the water storage tank does not need to store water, i.e., when the second piston is open and the first piston is not open.

[0036] Figure 6 for Figure 2 A schematic diagram of the structure when the water pressure at the inlet is less than the limit pressure value, that is, when neither the first piston nor the second piston is open. Detailed Implementation

[0037] To facilitate understanding by those skilled in the art, the structure of this utility model will now be described in further detail with reference to the accompanying drawings:

[0038] refer to Figure 1-6 A pressure limiting control mechanism, comprising:

[0039] The first control valve 1 includes an inlet end 5 connected to the corresponding municipal pipe network at the inlet end and a first valve body 11 connected to the inlet end of the corresponding regulating water tank 6 at the outlet end, as well as a valve core 12 disposed in the first valve body 11 and a first piston 13 movably disposed in the valve core 12. One end of the first piston 13 forms a piston cavity 14 between itself and the inner wall of the valve core 12, and the other end is provided with a conduction channel 131 that connects the inlet end 5 and the piston cavity 14. The first piston 13 is blocked at the inlet end of the first valve body 11 by the elastic force of the first elastic element 15.

[0040] The second control valve 2 includes a second valve body 21 that connects the piston chamber 14 and the outlet end of the first valve body 11 through a connecting channel 3 and a drain channel 4, respectively, and a second piston 22 movably disposed within the second valve body 21. The second valve body 21 is provided with a guide hole 211 that connects the connecting channel 3 and the drain channel 4. The second piston 22 includes a blocking part 221 and a pressure receiving part 222 that are spaced apart. The outlet end of the connecting channel 3 is located between the guide hole 211 and the pressure receiving part 222. The second piston 22 is subjected to the elastic force of a second elastic member 23 and blocks the guide hole 211 through the blocking part 221. The elastic force of the second elastic member 23 is set to a limited pressure value.

[0041] The above structure, through the addition of the first control valve 1 and the second control valve 2, allows the water flow and pressure at the inlet 5, i.e. the water flow and pressure of the municipal pipe network, to be transmitted sequentially through the conduction channel 131, the piston chamber 14, and the connecting channel 3 to the guide hole 211 and the pressure receiving part 222. When the water pressure at the inlet 5 is greater than the limited pressure value, it indicates that the water pressure of the municipal pipe network is relatively high, and it can be determined that the overall water usage period is low. At this time, the second piston 22 is disengaged from the guide hole 211 after being pressed against the elastic force of the second elastic element 23. The connecting channel 3 and the drainage channel 4 are connected through the guide hole 211, and the water flow flows through the drainage channel 4 towards the outlet of the second valve body 21, and then towards the inlet of the regulating water tank 6. After the second piston 22 opens, the first piston 13 disengages from or blocks the inlet of the first valve body 11 as the water pressure in the piston chamber 14 changes. Specifically, when the regulating water tank 6 needs to store water, the water flow from the drainage channel 4 can be smoothly discharged to the outlet of the second valve body 21 and then stored in the regulating water tank 6 via the inlet. At this time, the water volume in the piston chamber 14 decreases and the water pressure is less than that at the inlet 5. Therefore, the first piston 13 is pressed against the elastic force of the first elastic element 15 and disengages from the first valve body 11. The inlet end 5 of the first valve body 11 is connected to the inlet end of the regulating water tank 6 through the inlet and outlet ends of the first valve body 11 to further store water in the regulating water tank 6. When the regulating water tank 6 does not need to store water, since both the inlet end of the regulating water tank 6 and the outlet end of the first valve body 11 are full of water, the drainage channel 4 cannot drain water. At this time, the water volume in the piston chamber 14 remains unchanged, and the water pressure is not less than that at the inlet end 5. Therefore, the pressure on both sides of the first piston 13 is the same, and it still blocks the inlet end of the first valve body 11. When the water pressure at the inlet end 5 is less than the limited pressure value, it means that the water pressure of the municipal pipe network is low, and it can be judged that it is in the peak water use period. At this time, the water pressure transmitted to the second valve body 21 is insufficient to open the second piston 22, and the first piston 13 will not open either. Therefore, the pressure limiting control mechanism is in the closed state, and the regulating water tank 6 stops storing water.

[0042] By setting the pressure limiting control mechanism, the elastic force of the second elastic element 23 is set to a limited pressure value. Then, the water pressure at the inlet end 5 is transmitted through the transmission channel 131, piston chamber 14, and connecting channel 3. This allows the mechanical structure to control the opening and closing of the second piston 22 according to the water pressure of the municipal pipeline network, and then control the opening and closing of the first piston 13. Ultimately, the water storage tank 6 can automatically open and close according to the pressure of the municipal pipeline network to achieve the purpose of staggered water storage. Compared with the existing control method that judges by pressure sensor, this mechanical control method that directly uses the water pressure at the inlet end 5 of the municipal pipeline network as the pressure to trigger the opening and closing of the piston has more significant stability, can greatly reduce the risk of judgment error, ensure that the water storage tank 6 stores water at the accurate time, and can reduce maintenance difficulty.

[0043] To improve the adaptability of the staggered peak water storage and supply system, an adjusting screw 24 is screwed through the side wall of the second valve body 21, located on the side of the pressure-bearing part 222 away from the guide hole 211. The inner end of the adjusting screw 24 is provided with a limiting cover 241 whose opening spacing corresponds to that of the pressure-bearing part 222. The second elastic element 23 is a second spring with its two ends connected to the pressure-bearing part 222 and the limiting cover 241 respectively. With the addition of the adjusting screw 24 and the limiting cover 241, the elastic force of the second spring can be adjusted by adjusting the screwing depth of the adjusting screw 24. In this way, a suitable limiting pressure value can be set according to the municipal water pressure values ​​of different regions. Then, the elastic force of the second elastic element 23 can be adjusted to the same value as the limiting pressure value by adjusting the adjusting screw 24. This makes the staggered peak water storage and supply system applicable to different regions and improves its adaptability.

[0044] To improve the stability of the second piston 22, the inner wall of the valve body is recessed with a guide groove 212 corresponding to the guide hole 211 on the side away from the blocking part 221. The second piston 22 also includes a guide rod 223 with one end laterally sealed and slidably inserted into the guide groove 212 and the other end laterally penetrating the guide hole 211. The blocking part 221 and the pressure-bearing part 222 are spaced apart at the other end of the guide rod 223 in the direction away from the guide hole 211. The pressure-bearing part 222 is configured as a flexible sleeve with its outer periphery connected to the inner wall of the second valve body 21. Specifically, the flexible sleeve can be made of elastic and flexible materials such as rubber. Thus, by guiding the sliding of one end of the guide rod 223 through the guide groove 212 and flexibly limiting the other end of the guide rod 223 through the flexible sleeve, the stability of the second piston 22 during lateral sliding can be greatly improved, avoiding radial displacement when the second piston 22 is pressed out of the guide hole 211, ensuring that it always slides in a straight lateral direction, thereby improving the stability of the second piston 22 in sealing and opening the guide hole 211.

[0045] To improve the stability of water pressure acting on the pressure-receiving part 222, a pressure-receiving cavity 25 is formed between the guide hole 211 and the pressure-receiving part 222. The pressure-receiving cavity 25 includes a guide area 251 whose inner diameter gradually increases towards the flexible sleeve. By adding the guide area 251, the water flow entering the pressure-receiving cavity 25 can be mainly guided to squeeze towards the flexible sleeve, thereby increasing the force-bearing area of ​​the flexible sleeve and preventing the driving force of the water pressure from being excessively affected by the reaction force of the flexible sleeve, thus improving the stability and accuracy of water pressure acting on the pressure-receiving part 222.

[0046] To improve the linkage efficiency between the first control valve 1 and the second control valve 2, the second valve body 21 is sealed and fixed on the outer wall of the first valve body 11. The side wall of the valve core 12 is provided with a connecting pipe 121 that penetrates the side wall of the first valve body 11 and the side wall of the second valve body 21. The connecting pipe 121 forms the connecting channel 3. The side walls of the first valve body 11 and the second valve body 21 are respectively provided with drainage holes, and the two drainage holes form the drainage channel 4. The above structure, by directly connecting the first valve body 11 and the second valve body 21, can minimize the length of the connecting channel 3 and the drainage channel 4, thereby improving the efficiency of water pressure at the inlet end 5 being transmitted to the pressure chamber 25 through the transmission channel 131, piston chamber 14, and connecting channel 3, improving the efficiency of water flow in the second valve body 21 being discharged to the outlet end of the second valve body 21 through the drainage channel 4, and further improving the linkage efficiency between the first control valve 1 and the second control valve 2, improving the overall opening and closing efficiency of the pressure limiting control mechanism controlled by the water pressure at the inlet end 5, and reducing the delay in peak water storage of the regulating water tank 6.

[0047] To improve the stability of water pressure transmission through the conduction channel 131 to the inlet end 5, the valve core 12 has an opening on one side corresponding to the inlet end 5. The other end of the first piston 13 passes through the opening and extends toward the inlet end 5 to form a long strip-shaped conduction section 132. The long strip-shaped conduction channel 131 passes through the middle of the conduction section 132. By extending the length of the conduction channel 131, the water pressure at the inlet end 5 gradually stabilizes after flowing a certain distance through the conduction channel 131, ensuring stable water pressure in the piston chamber 14. This also prevents rapid inflow or outflow of water into or out of the piston chamber 14, which could cause sudden pressure changes and damage to the first piston 13, thus improving the overall stability of the first control valve 1.

[0048] To improve the stability of the first piston 13's movement, an inner groove 133 is formed by a recess at the inner end of the first piston 13. The first elastic element 15 is configured such that one end is connected to the inner groove 133 and adapted to the inner diameter of the inner groove 133, while the other end gradually narrows away from the bottom of the inner groove 133 and connects to a first spring in the middle of the inner wall of the valve core 12. Specifically, the first spring is a conical spring. This conical structure design of the first spring improves the stability of the first piston 13 when it disengages from the inlet end of the first valve body 11, preventing water hammer formation within the first valve body 11 due to high pressure at the inlet end 5, thus improving the stability of the first piston 13's movement and consequently enhancing the overall stability of the first control valve 1.

[0049] A peak-shaving water storage and supply system includes:

[0050] The regulating water tank 6 has an outlet for supplying water to residents.

[0051] As described above, in the pressure limiting control mechanism, the outlet end of the first valve body 11 is connected to the inlet end of the regulating water tank 6;

[0052] The control system is used to control the operation of various structures in the peak-shaving water supply system.

[0053] To further improve the water storage stability of the staggered peak water storage system, the system also includes a manual control valve 51 and an electric regulating valve 52 connected sequentially between the inlet end 5 and the water inlet end of the first valve body 11, respectively used to control the opening and closing of the inlet end 5. The outlet end of the storage tank 6 is connected to the user's main pipeline through a variable frequency speed control water supply device 7. Specifically, the variable frequency speed control water supply device 7 is an existing product, and its specific structure is not the main inventive point of this application, so it will not be described in detail. Thus, when the municipal pipeline needs maintenance or malfunction and the water storage in the storage tank 6 needs to be manually shut off, the inlet end 5 can be directly closed through the manual control valve 51 or the electric regulating valve 52, thereby stopping the water storage in the storage tank 6.

[0054] To control the water level in the regulating water tank 6, a solenoid valve 61 is provided between the outlet end of the first valve body 11 and the inlet end of the regulating water tank 6 to control the opening and closing of the inlet end of the regulating water tank 6. A float valve 62, communicatively connected to the solenoid valve 61, is provided inside the regulating water tank 6. This allows the control system to control the opening and closing of the solenoid valve 61 via signals from the float valve 62, ensuring that the regulating water tank 6 stores water at the set water level.

[0055] To ensure the water quality of the regulating water tank 6, the regulating water tank 6 is connected to a water level pressure sensor 63 for detecting the water level and a drain electric valve 64 for controlling drainage. Thus, in the event of overfilling of the water tank due to accidental factors, the excess water from the previous day can be drained from the regulating water tank 6 by closing the electric regulating valve 52 and opening the drain electric valve 64, ensuring that the water age does not exceed the prescribed time.

[0056] The above description is merely a preferred embodiment of this utility model and is not intended to limit the utility model. Various modifications and variations can be made to this utility model by those skilled in the art. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. A pressure limiting control mechanism, characterized in that, include: The first control valve (1) includes a first valve body (11) with an inlet end (5) connected to the corresponding municipal pipe network and an outlet end connected to the inlet end of the corresponding regulating water tank (6), a valve core (12) disposed in the first valve body (11), and a first piston (13) movably disposed in the valve core (12). One end of the first piston (13) forms a piston cavity (14) between the inner wall of the valve core (12), and the other end is provided with a conduction channel (131) connecting the inlet end (5) and the piston cavity (14). The first piston (13) is blocked by the elastic force of the first elastic element (15) at the inlet end of the first valve body (11). The second control valve (2) includes a second valve body (21) that connects the piston chamber (14) and the outlet of the first valve body (11) through a connecting channel (3) and a drain channel (4) respectively, and a second piston (22) that is movably disposed in the second valve body (21). The second valve body (21) is provided with a guide hole (211) that connects the connecting channel (3) and the drain channel (4). The second piston (22) includes a blocking part (221) and a pressure receiving part (222) that are spaced apart. The outlet of the connecting channel (3) is located between the guide hole (211) and the pressure receiving part (222). The second piston (22) is subjected to the elastic force of the second elastic element (23) and blocks the guide hole (211) through the blocking part (221). The elastic force of the second elastic element (23) is set to a limited pressure value. The water flow and water pressure at the inlet end (5) are transmitted sequentially through the conduction channel (131), piston chamber (14), and connecting channel (3) to the guide hole (211) and the pressure receiving part (222). When the water pressure at the inlet end (5) is greater than the limit pressure value, the second piston (22) is pressed away from the guide hole (211), and the first piston (13) is separated from or blocks the water inlet end of the first valve body (11) as the water pressure in the piston chamber (14) changes.

2. The pressure limiting control mechanism as described in claim 1, characterized in that, The second valve body (21) is screwed through to the side wall and is provided with an adjusting screw (24) located on the side of the pressure-bearing part (222) away from the guide hole (211). The inner end of the adjusting screw (24) is provided with a limiting cover (241) with an opening spacing corresponding to the pressure-bearing part (222). The second elastic element (23) is a second spring with its two ends connected to the pressure-bearing part (222) and the limiting cover (241) respectively. The screwing depth of the adjusting screw (24) is used to adjust the elastic force of the second spring.

3. The pressure limiting control mechanism as described in claim 1, characterized in that, The inner wall of the valve body is recessed and has a guide groove (212) corresponding to the guide hole (211) on the side away from the sealing part (221). The second piston (22) also includes a guide rod (223) with one end laterally sealed and slidably inserted into the guide groove (212) and the other end laterally penetrating the guide hole (211). The sealing part (221) and the pressure-bearing part (222) are spaced apart at the other end of the guide rod (223) in the direction away from the guide hole (211). The pressure-bearing part (222) is a flexible sleeve with its outer periphery connected to the inner wall of the second valve body (21).

4. The pressure limiting control mechanism as described in claim 3, characterized in that, A pressure cavity (25) is formed between the guide hole (211) and the pressure receiving part (222), and the pressure cavity (25) includes a guide area (251) whose inner diameter gradually increases toward the flexible sleeve.

5. The pressure limiting control mechanism as described in claim 1, characterized in that, The second valve body (21) is sealed and fixed on the outer wall of the first valve body (11). The side wall of the valve core (12) is provided with a connecting pipe (121) that passes through the side wall of the first valve body (11) and the side wall of the second valve body (21). The connecting channel (3) is formed in the connecting pipe (121). The side walls of the first valve body (11) and the second valve body (21) are respectively provided with drainage holes, and the two drainage holes form the drainage channel (4).

6. The pressure limiting control mechanism as described in claim 1, characterized in that, The valve core (12) is provided with an opening on one side corresponding to the inlet end (5), and the other end of the first piston (13) passes through the opening and extends toward the inlet end (5) to form a long strip-shaped conductive part (132). The middle part of the conductive part (132) is provided with a long strip-shaped conductive channel (131).

7. The pressure limiting control mechanism as described in claim 1, characterized in that, The inner end of the first piston (13) is recessed to form an inner groove (133). The first elastic element (15) is configured such that one end is connected to the inner groove (133) and is adapted to the inner diameter of the inner groove (133), and the other end gradually shrinks away from the bottom of the inner groove (133) and is connected to the first spring in the middle of the inner wall of the valve core (12).

8. A peak-shaving water storage and supply system, characterized in that, include: The regulating water tank (6) has an outlet end for supplying water to residents; According to any one of claims 1-7, the outlet end of the first valve body (11) is connected to the inlet end of the regulating water tank (6).

9. A peak-shaving water storage and supply system as described in claim 8, characterized in that, It also includes a manual control valve (51) and an electric regulating valve (52) connected in sequence between the inlet end (5) and the water inlet end of the first valve body (11) and used to control the opening and closing of the inlet end (5). The outlet end of the water storage tank (6) is connected to the user's main pipe through a variable frequency speed regulation water supply device (7).

10. A peak-shaving water storage and supply system as described in claim 8, characterized in that, A solenoid valve (61) for controlling the opening and closing of the water inlet of the water storage tank (6) is provided between the outlet end of the first valve body (11) and the inlet end of the water storage tank (6). A float valve (62) that is communicatively connected to the solenoid valve (61) is provided inside the water storage tank (6). A water level pressure sensor (63) for detecting the water level and a drain electric valve (64) for controlling the drainage are connected to the water storage tank (6).

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