A pressure-preserving pump and energy-saving supercharger utilizing the residual pressure of a municipal water supply network and its working method

Abstract

The present invention discloses a pressure-preserving pump energy-saving supercharger utilizing the residual pressure of a municipal water supply network and a working method thereof, belonging to the field of secondary water supply superchargers. A pressure-preserving pump energy-saving supercharger utilizing the residual pressure of a municipal water supply network makes full use of the energy of the municipal residual pressure to do work, driving two strokes of the piston cylinder in the supercharger. The area of the upper end of the piston cylinder is n times that of the lower end area. Then, the hydraulic work done in the upper chamber will generate a pressure n times that of the municipal residual pressure in the lower chamber, realizing pressurized water supply without consuming electric energy. For the working water after the utilization of the residual pressure, the municipal residual pressure is also used to do work to drive the reverse stroke of the piston, and the working water after doing work in the upper chamber is injected into the water tank. Although the pressure in the upper chamber during the second stroke of the piston cylinder is #imgabs0# of the municipal residual pressure, it is sufficient to send the water stored in the upper chamber into the non-pressure water tank. The supercharger of the present invention is particularly suitable for green water supply without power consumption during the small-flow water use period at night in buildings and communities.

Description

Technical Field

[0001] The present invention belongs to the field of energy-saving and pressurizing for serving secondary water supply, and in particular to an energy-saving pressurizing device and a working method for maintaining a pump by utilizing the residual pressure of a municipal water supply network. Background Art

[0002] Due to rapid urban development, increased building density and water loads, and the delayed renovation of municipal water supply networks, the pressure in the municipal network (hereinafter referred to as residual pressure) has dropped, making it unable to meet the needs of direct water supply for older residential communities. To prevent impact on the municipal network, water supply companies have restricted users from using superimposed pressure water supply. As a result, many older residential communities use a "tank (pool) + frequency conversion" system for secondary water supply to regulate and boost pressure. When water from the municipal network is introduced into the tanks, the residual pressure is wasted and cannot be utilized. During low-flow nighttime periods, water pumps operate inefficiently or even ineffectively. For example, in one residential community, the low-flow period lasts from 1:00 AM to 5:00 AM, accounting for 16.7% of the total time and 0.8% of the total water consumption, but the pump power consumption accounts for 11.1% of the total daily power consumption.

[0003] Therefore, for the commonly used "water tank (pool) + frequency conversion" storage and pressure-boosting secondary water supply for buildings and communities, there is an urgent need for an energy-saving booster without external power during the night time period of trace water use, which can not only meet the user's stable pressure water supply but also avoid frequent starting and closing of water pumps to reduce energy consumption and carbon emissions. Summary of the Invention

[0004] The purpose of the present invention is to overcome the above technical shortcomings of the existing "water tank + frequency conversion" secondary water supply method, and to provide an energy-saving booster and working method that utilizes the residual pressure of the municipal water supply network to maintain the pump.

[0005] In order to achieve the above object, the present invention adopts the following technical solutions:

[0006] An energy-saving booster utilizing the residual pressure of a municipal water supply network to maintain a pump comprises a cylinder, a cylinder cover plate being provided on the top of the cylinder, a piston barrel being provided in the cylinder, a control rod being provided in the piston barrel, an auxiliary positioning plate being provided at the bottom of the control rod, an upper cover being provided on the top of the piston barrel, the control rod extending through the upper cover to the outside of the cylinder cover plate, a three-way reversing valve being provided on the cylinder cover plate, a reversing plate being provided on the top of the control rod extending to the outside of the cylinder cover plate, and the reversing plate being located inside the three-way reversing valve;

[0007] The valve body of the three-way reversing valve is provided with upper and lower baffles, which divide the three-way reversing valve into three compartments, namely upper, middle and lower. The three compartments are respectively provided with connection ports.

[0008] The cylinder block includes upper and lower parts. The lower part of the cylinder block is provided with an inward-facing end surface, which is in contact with the barrel of the piston cylinder; the upper cover of the piston cylinder is in contact with the barrel wall of the upper part of the cylinder block, and the area of the upper cover of the piston cylinder is larger than the bottom area; the bottom of the lower part of the cylinder block is provided with a pressurized water outlet pipe, and a check valve for water outlet is arranged in the pressurized water outlet pipe. One side of the lower part of the cylinder block is provided with a lower cavity water filling pipe, and a check valve for water inlet is arranged in the lower cavity water filling pipe. One side of the upper part of the cylinder block close to the lower part is provided with a middle cavity ventilation pipe;

[0009] The cylinder block cover plate is provided with an upper cavity connecting pipe, and the other end of the upper cavity connecting pipe is connected to the middle connecting port of a three-way reversing valve; the lower connecting port of the three-way reversing valve is connected to a three-way reversing valve water inlet pipe, and the upper connecting port of the three-way reversing valve is connected to a water tank inlet pipeline;

[0010] When the piston cylinder descends at the highest position of the cylinder block, as the piston cylinder descends, the upper cover of the piston cylinder abuts against the auxiliary positioning plate, and then the control rod descends accordingly. As the piston cylinder continues to descend, the upper cover of the piston cylinder contacts the end surface at the lower part of the cylinder block cover plate. The piston cylinder descends to the lowest position. At this time, the reversing plate of the control rod is located at the lower baffle of the three-way reversing valve, and the three-way reversing valve water inlet pipe at the lower interface of the three-way reversing valve is separated from the cavity of the cylinder block;

[0011] When the piston cylinder ascends at the lowest position of the cylinder block, as the piston cylinder ascends, the bottom of the piston cylinder abuts against the auxiliary positioning plate, and then the control rod ascends accordingly. As the piston cylinder continues to ascend, the piston cylinder contacts the cylinder block cover plate. The piston cylinder ascends to the highest position. At this time, the reversing plate of the control rod is located at the upper baffle of the three-way reversing valve, and the water tank inlet pipeline at the upper interface of the three-way reversing valve is separated from the cavity of the cylinder block.

[0012] Furthermore, the bottom of the cylinder block is provided with a base.

[0013] The installation method of the pressure-preserving pump energy-saving booster using the residual pressure of the municipal water supply network described in the present invention: Connect the pressurized water outlet pipe to the terminal user network, connect the lower cavity water filling pipe and the three-way reversing valve water inlet pipe to the municipal tap water, connect the water tank inlet pipeline to the water tank, and connect the middle cavity ventilation pipe to the atmosphere.

[0014] The working method of the pressure-preserving pump energy-saving booster using the residual pressure of the municipal water supply network described in the present invention realizes pressurized water supply through the descent of the piston cylinder;

[0015] Realize water filling and water drainage through the ascent of the piston cylinder.

[0016] Furthermore, the realization of pressurized water supply through the descent of the piston cylinder is specifically as follows:

[0017] Municipal tap water enters the three-way reversing valve through the inlet pipe of the three-way reversing valve, passes through the upper cavity connecting pipe and the cover plate into the upper cavity of the cylinder block. Under the action of the residual pressure in the pipe network, pressurized water enters the upper cavity of the cylinder block, and the volume expands, pushing the piston cylinder downward. The piston cylinder moves downward, and the cylinder block below the piston cylinder. The cavity between the piston cylinder and the lower end face of the cylinder block is exhausted through the middle cavity vent pipe, and the volume shrinks. The lower cavity of the cylinder block is compressed by the downward movement of the piston cylinder, so that the water in the lower cavity of the cylinder block is pressurized, and the pressurized water is supplied to users through the pressurized outlet pipe and the check valve.

[0018] When the piston cylinder moves downward to the lowest position, the pressurized water supply working condition ends. At this time, the control rod moves downward to the lowest position along with the piston cylinder, and the reversing plate in the three-way reversing valve reaches the lower baffle, and the inlet pipe of the three-way reversing valve is cut off from the cylinder block. At the same time, the reversing plate leaves the upper baffle of the three-way reversing valve, and the water inlet pipe of the water tank is connected to the cylinder block.

[0019] Furthermore, the water filling and draining are realized by the upward movement of the piston cylinder, specifically as follows:

[0020] Municipal tap water enters the lower cavity of the cylinder block through the lower cavity filling pipe and the check valve under the action of the residual pressure in the pipe network. The lower cavity of the cylinder block is filled with water and the piston cylinder moves upward. The cavity between the piston cylinder and the lower end face of the cylinder block inhales and expands through the middle cavity vent pipe. The original pressurized water in the cylinder block above the piston cylinder flows into the water inlet pipe of the water tank through the cavity connecting pipe on the cover plate and the three-way reversing valve, and the non-pressurized working water is drained into the water tank.

[0021] When the piston cylinder moves upward to the cover plate and reaches the highest position, at this time, the control rod also reaches the highest position, the reversing plate reaches the upper baffle of the three-way reversing valve, the inlet three-way reversing valve inlet pipe of the three-way reversing valve is connected to the cylinder block, and the water inlet pipe of the water tank is cut off from the cylinder block, and the water filling and draining working condition ends.

[0022] Furthermore, two of the pressure pump energy-saving superchargers using the residual pressure of the municipal water supply network are combined and operated in parallel. The position of the piston cylinder at the start of work is controlled by the hydraulic pressure difference. The upper cover of the piston cylinder of one supercharger is located at the cover plate, and the upper cover of the piston cylinder of the other supercharger is located at the lower end face of the cylinder block.

[0023] Furthermore, the pressure increase value of the two superchargers adopts a 0.05 MPa pressure difference, so that one supercharger is in the pressurized water supply working condition, and the other supercharger is in the water filling and draining working condition, and they operate alternately to achieve uninterrupted pressurized water supply.

[0024] Furthermore, it is used in cooperation with the pneumatic water tank to achieve uninterrupted pressurized water supply.

[0025] Compared with the prior art, the present invention has the following beneficial effects:

[0026] An energy-saving supercharger that utilizes the residual pressure of the municipal water supply network to maintain pumping power. This system fully utilizes the energy of the municipal residual pressure to generate power, driving the piston cylinder within the supercharger through two strokes. The area of the upper end of the piston cylinder is several times that of the lower end. The hydraulic work in the upper chamber generates a pressure in the lower chamber that is several times higher than the municipal residual pressure, achieving direct pressurized water supply. The working water after the residual pressure is utilized also drives the piston in a reverse stroke under the same municipal residual pressure, injecting the working water after the upper chamber has been worked into the water tank. Although the upper chamber pressure during the second stroke of the piston cylinder is lower than the municipal residual pressure, it is sufficient to deliver the working water to the pressureless water tank. This supercharger is suitable for green water supply in residential areas during low-flow periods at night, with no electricity consumption.

[0027] A working method of an energy-saving booster that utilizes the residual pressure of a municipal water supply network to maintain a pump, utilizing the residual pressure of the municipal network to drive a piston cylinder to move up and down. The piston cylinder completes a working cycle with two up and down strokes. The municipal residual pressure energy that was previously wasted is utilized to drive the booster to increase water pressure and to fill and discharge water.

[0028] Furthermore, in order to overcome the intermittent boosting caused by the alternating operation of the two strokes of a supercharger, the air pressure water tank is coordinated to work together, or the two cylinders are combined to achieve continuous water supply during the period of trace water use at night, avoiding frequent starting and stopping and inefficient operation of the water pump during this period, and achieving the purpose of energy saving and pump protection. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 is a cross-sectional view of the present invention;

[0030] Figure 2 The cross-sectional view of the piston cylinder of the present invention at different positions, wherein: Figure 2 (a) The cross-sectional view of the piston cylinder during its downward movement. Figure 2 (b) The cross-sectional view of the piston cylinder when it reaches the lowest point. Figure 2 (c) The cross-sectional view of the piston cylinder during its upward movement. Figure 2 (d) A cross-sectional view of the piston cylinder as it ascends to its highest point;

[0031] Figure 3 This is a structural diagram of two energy-saving boosters operating in parallel using the residual pressure of the municipal water supply network to maintain pumping;

[0032] Figure 4 This is the first installation method of the present invention;

[0033] Figure 5 This is the second installation method of the present invention.

[0034] Wherein: 1. Cylinder block; 2. Piston barrel; 3. Cylinder block cover plate; 4. Upper chamber connecting pipe; 5. Reversing plate; 6. Three-way reversing valve; 7. Control rod; 8. Auxiliary positioning plate; 9. Lower chamber water filling pipe; 10. Inlet check valve; 11. Three-way reversing valve inlet pipe; 12. Booster outlet pipe; 13. Outlet check valve; 14. Middle chamber vent pipe; 15. Water tank inlet pipe; 16. Cylinder block upper chamber; 17. Cylinder block middle chamber; 18. Cylinder block lower chamber; 19. Base; 20. Booster inlet; 01. Low-level water tank inlet pipe; 02. Low-level water tank; 03. Frequency conversion pump; 04. Pneumatic water tank; 05. User pipe network; 06. Water using facilities; 07. Pressure sensor; 08. Electric control cabinet; 09. Energy-saving booster using the residual pressure of the municipal pipe network to protect the pump; 009. Two energy-saving boosters using the residual pressure of the municipal pipe network to protect the pump operate in parallel. Detailed implementation mode

[0035] In order to enable those skilled in the art to better understand the solution of the present invention, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative work shall fall within the protection scope of the present invention.

[0036] It should be noted that the terms "first", "second", etc. in the specification and claims of the present invention and the above-mentioned drawings are used to distinguish similar objects, and do not have to be used to describe a specific order or sequence. It should be understood that such data can be interchanged under appropriate circumstances so that the embodiments of the present invention described herein can be implemented in an order other than those illustrated or described herein. In addition, the terms "comprising" and "having" and any variations thereof are intended to cover non-exclusive inclusion. For example, a process, method, system, product or device comprising a series of steps or units does not have to be limited to those steps or units clearly listed, but may include other steps or units not clearly listed or inherent to these processes, methods, products or devices.

[0037] The purpose of the present invention is to overcome the defects of the "water tank + frequency conversion" method for secondary water supply, and provide an energy-saving booster that uses the residual pressure of the municipal pipe network to protect the pump with reasonable structural design and stable and reliable performance. It uses the residual pressure of the municipal pipe network to do work, uses the water tank to receive the working water after doing work for water storage, and does not consume external power to achieve pressurized water supply, protecting the pump from inefficient or ineffective operation and frequent start-stop, and saving energy and reducing consumption.

[0038] The following further describes the present invention in detail with reference to the accompanying drawings:

[0039] See Figure 1 ,Figure 1 This is a sectional view of the energy-saving booster for protecting pumps by utilizing the residual pressure of the municipal water supply network of the present invention. The booster of the present invention is vertically installed inside the pump house. The energy-saving booster for protecting pumps by utilizing the residual pressure of the municipal water supply network of the present invention includes a cylinder block 1. A cylinder block cover plate 3 is provided at the top of the cylinder block 1, and a base 19 is provided at the bottom of the cylinder block 1. A piston cylinder 2 is provided inside the cylinder block 1. A control rod 7 is provided inside the piston cylinder 2. An auxiliary positioning plate 8 is provided at the bottom of the control rod 7. An upper cover is provided at the top of the piston cylinder 2. The control rod 7 passes through the upper cover and extends outside the cylinder block cover plate 3. A three-way reversing valve 6 is provided on the cylinder block cover plate 3. A reversing plate 5 is provided at the top of the control rod 7 extending outside the cylinder block cover plate 3. The reversing plate 5 is located inside the three-way reversing valve 6. Inside the valve body of the three-way reversing valve 6, there are two upper and lower baffles. The two baffles divide the three-way reversing valve 6 into upper, middle, and lower compartments, and connecting ports are provided in the upper, middle, and lower compartments respectively. The cylinder block 1 includes upper and lower parts. The lower part of the cylinder block 1 has an inward end face, which is in contact with the barrel wall of the piston cylinder 2. The upper cover of the piston cylinder 2 is in contact with the barrel wall of the upper part of the cylinder block 1. The area of the upper cover of the piston cylinder 2 is larger than the bottom area. According to the movement of the piston cylinder 2, the cylinder block is divided into an upper cylinder chamber 16, a middle cylinder chamber 17, and a lower cylinder chamber 18. The chamber above the upper cover of the piston cylinder 2 is used as the upper cylinder chamber 16. The chamber between the lower part of the upper cover of the piston cylinder 2 and the lower part of the cylinder block 1 is used as the middle cylinder chamber 17. The chamber of the lower part of the cylinder block 1 is the lower cylinder chamber 18. A pressurized water outlet pipe 12 is provided at the bottom of the lower cylinder chamber 18. A water outlet check valve 13 is provided inside the pressurized water outlet pipe 12. A lower chamber water filling pipe 9 is provided on one side of the lower cylinder chamber 18. An inlet check valve 10 is provided inside the lower chamber water filling pipe 9. A middle chamber vent pipe 14 is provided on one side of the middle cylinder chamber 17. An upper chamber connecting pipe 4 is provided on the cylinder block 1. The other end of the upper chamber connecting pipe 4 is connected to the middle connecting port of the three-way reversing valve 6. The lower connecting port of the three-way reversing valve 6 is connected to a three-way reversing valve inlet pipe 11. The upper connecting port of the three-way reversing valve 6 is connected to a water tank inlet pipe 15. The water tank inlet pipe 15 is connected to a water tank. The three-way reversing valve inlet pipe 11 and the lower chamber water filling pipe 9 are both connected to the municipal tap water. When the piston cylinder 2 moves downward in the cylinder block 1, as the piston cylinder 2 moves downward, the upper cover of the piston cylinder 2 abuts against the auxiliary positioning plate 8, and then the control rod 7 moves downward accordingly. As the piston cylinder 2 continues to move downward, the upper cover of the piston cylinder 2 contacts the end face at the lower part of the cylinder block cover plate 3. The piston cylinder 2 moves downward to the lowest position. At this time, the reversing plate 5 of the control rod 7 is located at the lower baffle of the three-way reversing valve 6, and the three-way reversing valve inlet pipe 11 at the lower interface of the three-way reversing valve 6 is separated from the chamber of the cylinder block 1.

[0040] When the piston cylinder 2 moves upward in the cylinder block 1, as the piston cylinder 2 moves upward, the bottom of the piston cylinder 2 abuts against the auxiliary positioning plate 8, and then the control rod 7 moves upward accordingly. As the piston cylinder 2 continues to move upward, the piston cylinder 2 contacts the cylinder block cover plate 3. The piston cylinder 2 moves upward to the highest position. At this time, the reversing plate 5 of the control rod 7 is located at the upper baffle of the three-way reversing valve 6, and the water tank inlet pipe 15 at the upper interface of the three-way reversing valve 6 is separated from the chamber of the cylinder block 1.

[0041] The lower cavity boosting pressure and the cylinder block upper cavity water discharge pressure of the present invention are as follows:

[0042] During the boosting water supply process of the first stroke, the vertical force on the piston cylinder is balanced, then:

[0043] p0𝑆1 = p2𝑆2, that is, p2 = p0𝑆1 / 𝑆2

[0044] During the water filling and discharging condition process of the second stroke, the vertical force on the piston cylinder is balanced, then:

[0045] p0𝑆2 = p1𝑆1, that is, p1 = p0𝑆2 / 𝑆1

[0046] In the formula: p0 - municipal pipe network pressure, MPa; p2 - lower cavity boosting pressure, MPa;

[0047] 𝑆1 - upper end area of the piston cylinder, ㎡; 𝑆2 - lower end area of the piston cylinder, ㎡, 𝑆1 > 𝑆2;

[0048] P1 - cylinder block upper cavity water discharge pressure, MPa. The area of the upper cover of the piston cylinder 2 is n times the area of the bottom of the piston cylinder 2, n ≥ 2.

[0049] The working principle of the present invention is to generate an upper and lower pressure difference through the unequal areas of the upper and lower parts of the piston cylinder. When the piston cylinder moves downward to boost water supply and reaches the lowest position, the water supply is paused and automatically converted to water filling in the lower cavity and the piston cylinder moves upward. The water in the cylinder block upper cavity is discharged into the water tank. When returning to the original working position, the water inlet channel to the water tank is automatically closed and the municipal water inlet is opened, entering the boosting water supply condition, and cycling alternately to achieve the functions of energy saving and pump protection. The specific working process is as follows:

[0050] This supercharger is installed in the secondary water supply pump house with the traditional "water tank + frequency conversion". The water tank vacates the spare storage capacity, and the piston cylinder sliding assembly of the supercharger is worked on by the municipal residual pressure, realizing the reciprocating cycle of two strokes, and automatically and smoothly intermittently pressurizing water supply. The first stroke: the piston cylinder 2 moves downward to pressurize the water supply condition. The tap water from the municipal pipe network enters the upper cavity 16 of the cylinder block through the three-way reversing valve 6 and the cover plate 3. Due to the unequal areas of the upper and lower parts of the piston cylinder, the pressure difference between the upper and lower parts of the piston cylinder increases to the threshold value, and the piston cylinder 2 moves downward to pressurize the water in the lower cavity 18 of the cylinder block through the pressurized water outlet pipe 12 at the bottom of the cylinder block and supply it to the user pipe network 05; when the piston cylinder 2 moves downward to the lowest position, the upper cavity 16 of the cylinder block is filled with water, and all the stored water in the lower cavity 18 of the cylinder block is pressurized and supplied to the user, and the first stroke ends. The second stroke: the piston cylinder 2 moves upward to fill and drain water condition. The reversing plate 5 in the three-way reversing valve 6 closes the channel leading to the upper cavity 16 of the piston cylinder block, and the upper cavity of the cylinder block loses pressure. The tap water from the municipal pipe network enters the lower cavity 18 of the cylinder block through the lower cavity water filling pipe 9 and the check valve 10 on it. As the lower cavity 18 of the cylinder block is filled with water, the piston cylinder 2 moves upward, and the water in the upper cavity 16 of the cylinder block enters the water tank. When the piston cylinder 2 rises to the highest position, the lower cavity 18 of the cylinder block is filled with water, and all the water in the upper cavity 16 of the cylinder block is drained into the water tank. The reversing plate 5 in the three-way reversing valve closes the water inlet pipe 15 of the water tank, opens the pressurized tap water from the municipal pipe network to enter the upper cavity 16 of the cylinder block through the water inlet pipe 11 of the three-way reversing valve and the upper cavity connecting pipe 4, and is converted to the pressurized water supply condition of the first stroke. The cycle alternates to achieve the functions of energy saving and pump protection.

[0051] See Figure 2 , Figure 2 is a schematic structural diagram of the two-stroke cycle of the present invention, in which, Figure 2 (a) During the downward movement of the piston cylinder, that is, during the first stroke, the first stroke is: the municipal tap water enters the three-way reversing valve 6 through the water inlet pipe 11 of the three-way reversing valve, passes through the upper cavity connecting pipe 4, and passes the pressurized water through the cover plate 3 and enters the upper cavity 16 of the cylinder block. Under the action of the residual pressure of the pipe network, the upper cavity 16 of the cylinder block enters the pressurized water and the volume expands, pushing the piston cylinder 2 downward to compress the middle cavity 17 and the lower cavity 18 of the cylinder block. The non-pressurized middle cavity 17 of the cylinder block discharges air through the middle cavity vent pipe 14, and the volume shrinks; the lower cavity 18 of the cylinder block is compressed by the downward movement of the piston cylinder 2, so that the water in the lower cavity 18 of the cylinder block is pressurized, and the pressurized water in the lower cavity 18 of the cylinder block is supplied to the user and the pneumatic water tank through the pressurized water outlet pipe 12 and the check valve 13. When the piston cylinder 2 moves downward to the lowest position, the pressurized water supply condition ends. Figure 2 (b) When the piston cylinder moves downward to the lowest position, corresponding to the end of the first stroke and the start of the second stroke, at this time, the control rod 7 moves downward to the lowest position along with the piston cylinder 2, and the reversing plate 5 in the three-way reversing valve 6 reaches the lower baffle, and the water inlet pipe 11 of the three-way reversing valve is cut off from the cylinder block 1; while the reversing plate5 leaves the upper baffle of the three-way reversing valve 6, and the water inlet pipe 15 of the water tank is connected to the cylinder block 1; Figure 2(c) During the upward movement of the piston cylinder, it corresponds to the second stroke. Municipal tap water fills the lower chamber 18 of the cylinder block. The pressurized water in the lower chamber 18 of the cylinder block drives the piston cylinder 2 to move upward. The upper chamber 16 of the cylinder block discharges water. Under the action of the residual pressure, municipal tap water enters the lower chamber 18 of the cylinder block through the lower chamber filling pipe 9 and the inlet check valve 10. As the lower chamber 18 of the cylinder block fills with water, the piston cylinder 2 quickly moves upward. The middle chamber 17 of the cylinder block inhales and expands through the middle chamber ventilation pipe 14. The original pressurized water in the upper chamber 16 of the cylinder block flows into the water tank inlet pipe 15 through the upper chamber connection pipe 4 on the cover plate 3 and the three-way reversing valve 6, discharging the non-pressurized working water into the water tank. When the piston cylinder 2 moves upward to the cover plate 3 and reaches the highest position, at this time, the control rod 7 also reaches the highest position, and the reversing plate 5 reaches the upper baffle of the three-way reversing valve 6. The inlet of the three-way reversing valve of the water inlet three-way reversing valve 11 is connected to the cylinder block 1, and the connection between the water tank inlet pipe 15 and the cylinder block 1 is cut off, and the water filling and discharging working condition ends. Figure 2 (d) The piston cylinder moves upward to the highest position, corresponding to the end of the second stroke and the start of the third stroke. Next, it switches to the pressurized water supply working condition of the first stroke and circulates repeatedly.

[0052] See Figure 3 , Figure 3 is the structural diagram of two energy-saving superchargers using the residual pressure of the municipal water supply network to protect the pump and operate in parallel. The two superchargers are No. 1 and No. 2 respectively. The upper interfaces of the three-way reversing valves 6 of No. 1 and No. 2 are respectively connected to water tanks. The middle interfaces of the three-way reversing valves 6 of No. 1 and No. 2 are respectively connected to the corresponding upper chambers 16 of the cylinder blocks through the upper chamber connection pipes 4. The lower interfaces of the three-way reversing valves 6 of No. 1 and No. 2 are both connected to the tap water of the municipal water supply network. The lower chamber filling pipes 9 of the lower chambers 18 of the cylinder blocks of No. 1 and No. 2 are also both connected to municipal tap water. The pressurized water outlet pipes 12 of the cylinder blocks of No. 1 and No. 2 are connected and then supplied to users. By controlling the initial state of the piston cylinder, the two piston cylinders are respectively located at the highest and lowest positions, and the two connected superchargers alternately perform the working conditions of pressurized water supply and water filling and discharging to achieve uninterrupted pressurized water supply.

[0053] See Figure 4 , Figure 4 is the first installation method of the present invention. The original "water tank + frequency conversion" secondary water supply system includes: low-level water tank inlet pipe 01, low-level water tank 02, frequency conversion pump 03, pneumatic water tank 04, user water supply network 05, water-using facilities 06, pressure sensor 07, and electrical control cabinet 08. To install and add the "energy-saving supercharger using the residual pressure of the municipal water supply network to protect the pump" 09, a total of 3 pipe sections A, B, and C need to be added, that is, 1 supercharger inlet pipe section and 2 supercharger outlet pipe sections. The first pipe section A to be installed is: open a branch port on the pipe section from the municipal water supply network to the water tank, install the supercharger inlet pipe section, and connect the municipal tap water to Figure 1The water inlet 20 of the supercharger; The second pipe section B installed is: starting from the check valve 13 at the outlet of the supercharger, and ending after the check valve of the water pump outlet pipe; The third pipe section C installed is: starting from the water tank inlet pipe 15 at the top of the supercharger cylinder block and connecting to the water tank to terminate. When the water level in the water tank is at the highest level and there is no tank volume to receive the drainage from the upper cavity of the supercharger cylinder block, the supercharger stops working. When water is sucked from the water tank by the variable frequency pump for pressurization and supplied to users, after the water level in the water tank drops, the supercharger can restart working. The supercharger can replace the inefficient operation of the water pump during the low-flow water use period at night, and at the same time use the pneumatic water tank to compensate for the intermittent pressurization defect of the supercharger to achieve continuous water supply.

[0054] See Figure 5 , Figure 5 This is the second installation method of the present invention, that is, two superchargers are in parallel. The original "water tank + variable frequency" secondary water supply system includes: the low-level water tank inlet pipe 01, the low-level water tank 02, the variable frequency pump 03, the pneumatic water tank 04, the user pipe network 05, the water using facilities 06, the pressure sensor 07, and the electrical control cabinet 08. Two parallel energy-saving superchargers using the residual pressure of the municipal pipe network to protect the pump 009 require the installation of 3 pipe sections A, B, and C, that is, 1 supercharger inlet pipe section and 2 supercharger outlet pipe sections. The first pipe section A installed is: open a branch port on the pipe section from the municipal water supply pipe network into the water tank, install the supercharger inlet pipe section, and connect the municipal tap water to the water inlet 20 of the supercharger in the supercharger; The second pipe section B installed is: starting from the check valve 13 at the outlet of the supercharger, and ending after the check valve of the water pump outlet pipe; The third pipe section C installed is: starting from the water tank inlet pipe 15 at the top of the supercharger cylinder block and connecting to the water tank to terminate. When the water level in the water tank is at the highest level and there is no tank volume to receive the drainage from the upper cavity of the supercharger cylinder block, the supercharger stops working. When water is sucked from the water tank by the variable frequency pump for pressurization and supplied to users, after the water level in the water tank drops, the supercharger can restart working. The two connected superchargers alternately carry out the processes of pressurized water supply and water filling and drainage to achieve continuous water supply.

[0055] Taking the pressure increase multiple as 3 as an example, that is, the residual pressure of the municipal pipe network is 0.2 MPa, the required pressure of the user pipe network is 0.6 MPa, and the pressure ratio is 1:3. Then the area at the upper end of the upper cavity of the supercharger piston cylinder is 3 times the area at the lower end, that is, the water inflow into the upper cavity of the cylinder block is 3 times the pressurized water supply volume from the lower cavity of the supercharger cylinder block. For example: The supercharger takes 4 m 3 of water from the municipal pipe network, and the supercharger supplies 1 m 3 of water to users. 3 m 3 of water needs to enter the upper cavity of the cylinder block to drive the piston cylinder to do work. In the second stroke, this 3 m 3 of working water after doing work needs to be completely discharged from the upper cavity of the cylinder block and stored in the water tank. The working water received by the water tank is finally pressurized by the variable frequency pump and supplied to the user pipe network to vacate the water tank volume to continue to receive the unpressurized working water discharged from the upper cavity of the supercharger. Suppose the daily water consumption of the community is 100 m3 , the energy of the residual pressure of the municipal pipe network can be utilized to do work for pressurized water supply of 25 m 3 , and the total amount of water discharged into the water tank by the booster is 3 times the water supply: 3 × 25 = 75 m 3 , the non-pressurized water in the water tank needs to be pressurized by the variable frequency pump unit to supply the user pipe network. The energy saving rate of the booster is about 25%. Therefore, the booster cannot completely replace the pump unit, but works together to play a certain role in energy saving and pump protection.

[0056] The booster of the present invention works together with the water tank and the variable frequency pump. The water tank receives the discharge of the working water of the booster, and the variable frequency pump runs regularly to supply the water discharged by the booster, emptying the inventory of the water tank to serve the discharge of the working water of the booster. The working water stored in the water tank that has lost residual pressure is not contaminated and must be pressurized by the variable frequency pump to supply the user pipe network.

[0057] The above content is only to illustrate the technical idea of the present invention and cannot be used to limit the protection scope of the present invention. Any modification made on the basis of the technical solution according to the technical idea proposed by the present invention falls within the protection scope of the claims of the present invention.

Claims

1. A pressure-preserving pump and energy-saving supercharger utilizing the residual pressure of a municipal water supply network, characterized in that, It includes a cylinder block (1), a cylinder block cover plate (3) is provided at the top of the cylinder block (1), a piston cylinder (2) is provided inside the cylinder block (1), a control rod (7) is provided inside the piston cylinder (2), an auxiliary positioning plate (8) is provided at the bottom of the control rod (7), an upper cover is provided at the top of the piston cylinder (2), the control rod (7) passes through the upper cover and extends outside the cylinder block cover plate (3), a three-way reversing valve (6) is provided on the cylinder block cover plate (3), a reversing plate (5) is provided at the top of the control rod (7) extending outside the cylinder block cover plate (3), and the reversing plate (5) is located inside the three-way reversing valve (6); Inside the valve body of the three-way reversing valve (6), there are upper and lower baffle plates. The two baffle plates divide the three-way reversing valve (6) into upper, middle, and lower compartments, and the upper, middle, and lower compartments are respectively provided with pipe connection ports; The cylinder block (1) includes upper and lower parts. The lower part of the cylinder block (1) is provided with an inward end face, and this end face is in contact with the barrel of the piston cylinder (2); the upper cover of the piston cylinder (2) is in contact with the barrel wall of the upper part of the cylinder block (1), and the area of the upper cover of the piston cylinder (2) is larger than the bottom area; at the bottom of the lower part of the cylinder block (1), there is a pressurized water outlet pipe (12), and a water outlet check valve (13) is installed on the pressurized water outlet pipe (12). On one side of the lower part of the cylinder block (1), there is a lower cavity water filling pipe (9), and a water inlet check valve (10) is installed on the lower cavity water filling pipe (9). On one side of the upper part of the cylinder block (1) near the lower part, there is a middle cavity ventilation pipe (14); An upper cavity connecting pipe (4) is provided on the cylinder block cover plate (3), and the other end of the upper cavity connecting pipe (4) is connected to the middle connection port of the three-way reversing valve (6); the lower connection port of the three-way reversing valve (6) is connected to a three-way reversing valve inlet pipe (11), and the upper connection port of the three-way reversing valve (6) is connected to a water tank inlet pipe (15); When the piston cylinder (2) descends from the highest position in the cylinder block (1), as the piston cylinder (2) descends, the upper cover of the piston cylinder (2) abuts against the auxiliary positioning plate (8), and then the control rod (7) descends accordingly. As the piston cylinder (2) continues to descend, the upper cover of the piston cylinder (2) contacts the end face at the lower part of the cylinder block cover plate (3), and the piston cylinder (2) descends to the lowest position. At this time, the reversing plate (5) of the control rod (7) is located at the lower baffle plate of the three-way reversing valve (6), and the three-way reversing valve inlet pipe (11) at the lower interface of the three-way reversing valve (6) is blocked from the upper cavity of the cylinder block (1); When the piston cylinder (2) ascends from the lowest position in the cylinder block (1), as the piston cylinder (2) ascends, the bottom of the piston cylinder (2) abuts against the auxiliary positioning plate (8), and then the control rod (7) ascends accordingly. As the piston cylinder (2) continues to ascend, the upper cover of the piston cylinder (2) contacts the cylinder block cover plate (3), and the piston cylinder (2) ascends to the highest position. At this time, the reversing plate (5) of the control rod (7) is located at the upper baffle plate of the three-way reversing valve (6), and the water tank inlet pipe (15) at the upper interface of the three-way reversing valve (6) is blocked from the upper cavity of the cylinder block (1); A base (19) is provided at the bottom of the cylinder block (1); The installation method of the energy-saving booster pump using the residual pressure of the municipal water supply network is as follows: Specifically, connect the pressurized water outlet pipe (12) to the terminal user water supply network (05), connect the lower chamber water filling pipe (9) and the three-way valve inlet pipe (11) to the municipal tap water inlet pipe, connect the water tank inlet pipe (15) to the water tank, and connect the middle chamber vent pipe (14) to the atmosphere.

2. The pressure-preserving pump energy-saving supercharger using the residual pressure of the municipal water supply network according to claim 1, wherein The area of the upper cover of the piston cylinder (2) is n times the area of the bottom of the piston cylinder (2), where n ≥ 2.

3. A working method of the energy-saving booster for protecting pumps by utilizing the residual pressure of the municipal water supply pipe network according to claim 1, characterized in that, The residual pressure of the municipal water supply network is utilized to do work to drive the piston cylinder (2) to move downward to achieve pressurized water supply. The piston cylinder (2) moves upward to achieve water filling and water discharging.

4. The working method of the pump protection energy-saving supercharger using the residual pressure of the municipal water supply network according to claim 3, characterized in that, The specific process of achieving pressurized water supply by the downward movement of the piston cylinder (2) is as follows: Municipal tap water enters the three-way valve (6) through the three-way valve inlet pipe (11), passes through the upper chamber connecting pipe (4) and the cover plate (3) and enters the upper chamber of the cylinder block (16). Under the action of the residual pressure of the water supply network, pressurized water enters the upper chamber of the cylinder block (16) and the volume expands, pushing the piston cylinder (2) downward. The piston cylinder (2) moves downward to squeeze the lower chamber of the cylinder block (18). The downward movement of the piston cylinder (2) causes the volume of the middle chamber of the cylinder block (17) to shrink, and the air in the middle chamber of the cylinder block (17) is exhausted through the middle chamber vent pipe (14). The lower chamber of the cylinder block (18) is compressed by the downward movement of the piston cylinder (2), so that the water in the lower chamber of the cylinder block (18) is pressurized. The pressurized water is supplied to the user water supply network (05) through the pressurized water outlet pipe (12) and the outlet check valve (13). When the piston cylinder (2) moves downward to the lowest position, the pressurized water supply working condition ends. At this time, the control rod (7) moves downward to the lowest position along with the piston cylinder (2), and the reversing plate (5) in the three-way valve (6) reaches the lower baffle, and the three-way valve inlet pipe (11) is cut off from the cylinder block (1). At the same time, the reversing plate (5) leaves the upper baffle of the three-way valve (6), and the water tank inlet pipe (15) is connected to the upper chamber of the cylinder block (16).

5. The working method of the energy-saving booster for protecting pumps by using the residual pressure of the municipal water supply network according to claim 3, characterized in that, The specific process of achieving water filling and water discharging by the upward movement of the piston cylinder (2) is as follows: Municipal tap water enters the lower chamber of the cylinder block (18) through the lower chamber water filling pipe (9) and the inlet check valve (10) under the action of the residual pressure of the water supply network. The water filling of the lower chamber of the cylinder block (18) drives the piston cylinder (2) to move upward. During the upward movement of the piston cylinder (2), the lower chamber of the cylinder block (18) and the middle chamber of the cylinder block (17) expand, and the upper chamber of the cylinder block (16) is compressed. The vent pipe (14) of the middle chamber of the cylinder block (17) inhales and expands. The original stored water in the upper chamber of the cylinder block (16) above the piston cylinder (2) flows into the water tank inlet pipe (15) through the upper chamber connecting pipe (4) on the cylinder block cover plate (3) and the three-way valve (6), and the non-pressurized working water is discharged into the water tank for storage. When the upper cover of the piston cylinder (2) moves upward to the cylinder block cover plate (3) and reaches the highest position, at this time, the control rod (7) also reaches the highest position, the reversing plate (5) reaches the upper baffle of the three-way valve (6), the inlet three-way valve inlet pipe (11) of the three-way valve is connected to the cylinder block (1), and the water tank inlet pipe (15) is cut off from the cylinder block (1), and the water filling and water discharging working condition ends.

6. The working method of the pump protection and energy-saving supercharger using the residual pressure of the municipal water supply network according to claim 3, characterized in that, Combine the two energy-saving superchargers that utilize the residual pressure of the municipal water supply network to operate in parallel. Control the position of the piston cylinder (2) at the start of operation through the hydraulic pressure difference. The upper cover of the piston cylinder (2) of one supercharger is located at the cylinder block cover plate (3), and the lower cover of the piston cylinder (2) of the other supercharger is located at the end face of the lower part of the cylinder block (1).

7. The working method of the pump protection, energy conservation and supercharger utilizing the residual pressure of the municipal water supply network according to claim 3, characterized in that, It is used in conjunction with a pneumatic water tank to achieve uninterrupted pressurized and stable water supply.

8. The working method of the pump protection, energy-saving and pressure-boosting device using the residual pressure of the municipal water supply network according to claim 6, characterized in that, The pressure increase values of the two superchargers adopt a 0.05 MPa pressure difference, enabling one supercharger to be in the pressurized water supply working condition and the other supercharger to be in the water filling and draining working condition, operating alternately to achieve uninterrupted pressurized water supply.

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