Secondary water supply equipment

Abstract

The utility model relates to secondary water supply equipment, which solves the problems of large hydraulic loss, large energy consumption, easy influence on water outlet pressure and the like in the prior art, and adopts the technical scheme that the secondary water supply equipment comprises a plurality of groups of water pumps and water flow branches respectively connected with water inlets and water outlets of each group of water pumps, the water flow branches comprise a water inlet branch, a water outlet branch and a main pipeline, the main pipeline is respectively communicated with the corresponding water flow branches, and the main pipeline comprises a water inlet main pipe and a water outlet main pipe which are respectively matched with the water inlet branch and the water outlet branch. The flow guide blocks are matched with the water flow branches in a one-to-one correspondence mode, the outer surfaces, facing the water flow branches, of the flow guide blocks are in a spherical arc shape, and the spherical arc-shaped surfaces of the flow guide blocks are used for guiding water flow to enter and exit from the corresponding water flow branches in a circular arc shape. The device has the effects of reducing hydraulic loss, reducing overall energy consumption, ensuring the water pressure of discharged water and meeting the water demand.

Description

Technical Field

[0001] This utility model relates to the field of mechanical equipment for water supply, and in particular to a secondary water supply equipment. Background Technology

[0002] Existing secondary water supply equipment includes multiple pump sets (i.e., water pumps, or pump assemblies), water flow branches connected to the inlet and outlet of each pump (each branch has various corresponding functional components, such as butterfly valves, check valves, flexible joints, etc.), and a main pipeline connected to each corresponding water flow branch. The pump sets are generally arranged in parallel, with the outlet of each outlet water flow branch connected to the outlet pipe of the main pipeline, and the inlet of each inlet water flow branch connected to the inlet pipe of the main pipeline. The water flow branches have smaller diameters, the main pipeline has a larger diameter, adjacent water flow branches (both for inlet and outlet) are evenly spaced, and all are directly and perpendicularly connected to their corresponding main pipeline.

[0003] Problems with existing secondary water supply equipment: 1. The main pipeline and water flow branches are connected perpendicularly. Water flow in the main pipeline (i.e., the inlet pipeline) makes a right-angle turn into the water flow branches, or water flow in the water flow branches makes a right-angle turn into the main pipeline (i.e., the outlet pipeline), resulting in significant hydraulic losses. 2. Butterfly valves, check valves, and flexible joints are installed on the water flow branches. The valve plate in the butterfly valve is a rotating structure. When fully open, the valve plate is parallel to the water flow and lies across the middle of the flow channel, obstructing fluid flow and causing hydraulic losses. The check valve is a lifting structure. Its valve core moves up and down along the central valve stem on the valve seat and is pre-tensioned by a spring. It requires a certain pressure to open. The fluid must overcome the pressure and push the valve core to move, obstructing fluid flow and causing hydraulic losses. Although the flexible joint has no obstructions in the middle, its inner cavity is bulging outward in the middle and relatively narrow at both ends, forming vortices in the outward bulge of the flexible joint, which cause hydraulic losses. This cumulative hydraulic loss at each stage increases the overall hydraulic losses of the secondary water supply system, significantly impacting its performance. In practical applications, this not only increases energy consumption but also easily leads to insufficient pressure at the water supply terminal, failing to meet actual usage needs and thus affecting people's domestic and industrial water use. Summary of the Invention

[0004] The purpose of this utility model is to solve the above-mentioned problems existing in the prior art by providing a secondary water supply device that reduces hydraulic loss, lowers overall energy consumption, ensures water pressure, and meets water demand.

[0005] The above-mentioned technical objective of this utility model is mainly achieved through the following technical solution: a secondary water supply device, comprising several sets of water pumps, water flow branches respectively connected to the inlet and outlet of each set of water pumps, each water flow branch including an inlet branch and an outlet branch, and a main pipeline respectively connected to each of the corresponding water flow branches, the main pipeline including an inlet main pipe and an outlet main pipe respectively cooperating with the inlet branch and the outlet branch, characterized in that several guide blocks are provided on the inner wall of the main pipeline, each guide block corresponding to one of the water flow branches, the outer surface of the guide block facing the water flow branch is spherical, and the spherical surface of the guide block is used to guide the water flow in and out of the corresponding water flow branch in an arc shape. The guide blocks are used to change the direction of water flow from the main inlet pipe into the branch inlet pipe, gradually directing the water flow towards the branch inlet pipe to form a curved flow, thus solving the hydraulic loss problem caused by the water flow turning at a right angle into the branch inlet pipe. At the same time, the guide blocks are also used to change the direction of water flow from the branch inlet pipe into the main outlet pipe, gradually directing the water flow towards the outlet direction of the main outlet pipe to form a curved flow, thus solving the hydraulic loss problem caused by the water flow turning at a right angle into the main outlet pipe. This effectively reduces the hydraulic loss during the operation of the secondary water supply equipment, and also effectively reduces the energy consumption of the secondary water supply equipment during operation.

[0006] As a further improvement and supplement to the above technical solution, this utility model adopts the following technical measures: the connection end between the water flow branch and the main pipeline is a bend, and the spherical arc curvature of the guide block is adapted to the bending amplitude of the connection end, so that the flow channel in the main pipeline and the interior of the corresponding water flow branch form a smoothly curved flow channel. By setting the bend and cooperating with the guide block, the bending guidance of the bend and the bending guidance of the outer surface of the guide block allow the water flow to form a smoothly curved water flow channel in the pipe section of the main pipeline corresponding to the bend and the guide block, thereby further solving the problem of water flow loss, further effectively reducing the hydraulic loss when the secondary water supply equipment is working, and effectively reducing the energy consumption when the secondary water supply equipment is working.

[0007] Preferably, a flexible joint is provided on the water flow branch, and an axial expansion component is provided in the inner cavity of the flexible joint. The inner cavity of the axial expansion component is adapted to the shape of the inner cavity of the corresponding main pipeline. The axial expansion component is used to keep the main pipeline cylindrical within the inner cavity of the flexible joint, and at the same time, it is used to flexibly connect the two ends of the flexible joint. The two ends of the flexible joint are respectively used to connect rigid components (such as ball valves, eccentric reducing short pipes, or rigid water pipes). Due to the flexible characteristics of the flexible joint, the coaxiality requirement of the rigid components connected at both ends is reduced during connection, thereby facilitating efficient connection. Because the inner cavity of a flexible joint is shaped like a waist drum, bulging outward in the middle and relatively narrow at both ends, fluid tends to form vortices in the outward bulging part of the flexible joint. These vortices cause hydraulic losses in the water flow. Therefore, by setting up an axial expansion component, not only can the waist drum-shaped inner cavity of the flexible joint be changed to a cylindrical shape, avoiding the phenomenon of vortices caused by the expansion of the diameter of the waist drum-shaped part, thus helping to reduce hydraulic losses, but it also ensures that the flexible joint can smoothly connect the corresponding components at both ends, ensuring connection reliability and efficiency.

[0008] Preferably, the axial telescopic assembly includes a first telescopic cylinder and a second telescopic cylinder that are plugged into each other. The fixed ends of the first and second telescopic cylinders have outwardly turned flanges and are positioned opposite each other. The outwardly turned flanges are clamped between corresponding components of the main pipeline and are fixedly connected by a connector. The cylindrical portions of the first and second telescopic cylinders are disposed in the inner cavity of the flexible joint and are plugged into each other. After the axial telescopic assembly is installed, the first and second telescopic cylinders can expand and contract to a certain extent (generally the amplitude is not large, so that the first and second telescopic cylinders can always maintain a plugged relationship, thereby ensuring that the flow channel in the flexible joint is a cylindrical flow channel, that is, the flow channel formed by the first and second telescopic cylinders) so that the flexible joint can smoothly connect the corresponding components at both ends.

[0009] Preferably, the axial length of the first telescopic cylinder is greater than the axial length of the second telescopic cylinder. The first telescopic cylinder extends from one axial end to the other axial end of the flexible inner cavity of the flexible joint, so that the inner cavity of the first telescopic cylinder forms the water flow inner cavity of the corresponding part of the water flow branch. The insertion portion of the first and second telescopic cylinders mates with the wall portion of the flexible joint. The greater axial length of the first telescopic cylinder ensures that the insertion portion between the first and second telescopic cylinders is located on the wall portion of the flexible joint, avoiding insertion within the cavity portion of the flexible joint. This improves the reliability of the insertion between the first and second telescopic cylinders and prevents separation during telescopic movement.

[0010] Preferably, a check valve is installed on the water flow branch. The check valve includes a check valve seat, a pivot mounted on the check valve seat, and a check plate mounted on the pivot. The pivot is positioned to mate with the side of the flow channel in the water flow branch. The shape of the check plate is adapted to the cross-section of the flow channel. The side of the check plate is fixed to the pivot. When the check plate opens the flow channel, it fits against the side wall of the flow channel. When the check plate closes the flow channel, it transversely cuts off the flow channel. Using a check valve with a swing-type check plate that rotates at one end instead of a butterfly valve ensures hydraulic efficiency by preventing the check plate from obstructing the flow channel when it opens.

[0011] Preferably, the water inlet branch includes a connecting elbow, a ball valve, a flexible joint, and an eccentric reducing short pipe connected in sequence. The bent end of the connecting elbow is connected to the main water inlet pipe, the straight part of the connecting elbow is connected to the ball valve, one end of the eccentric reducing short pipe is connected to the flexible joint, and the other end is connected to the water inlet of the water pump.

[0012] Preferably, the outlet branch includes a connecting bend, a ball valve, a flexible joint, and a concentric reducing bend connected in sequence. The bent end of the connecting bend is connected to the main outlet pipe, the straight section of the connecting bend is connected to the ball valve, one end of the concentric reducing bend is connected to the flexible joint, and the other end is connected to the outlet end of the water pump.

[0013] Preferably, all components in the inlet branch and the outlet branch are flanged, and the outward flange of the flexible joint on the water flow branch is clamped and fixed between the flanges on adjacent components.

[0014] Preferably, the main outlet pipe is equipped with a pressure sensor, an electrical contact pressure gauge, and a pressure tank, all of which are connected to the corresponding water pump via control signals. The pressure sensor is used to detect the water pressure in the main outlet pipe and control the operation of the water pump; the electrical contact pressure gauge is used to protect against overpressure in the main outlet pipe; the pressure tank is also connected to the control signals of the pressure sensor and the electrical contact pressure gauge to regulate the pressure fluctuations of the pressure sensor and the electrical contact pressure gauge, so as to smooth the pressure signal and absorb water hammer waves.

[0015] The beneficial effects of this utility model are as follows: 1. By setting the guide block to change the direction of water flow, a smooth curved flow channel is formed between the water branch and the main pipeline, solving the problem of hydraulic loss caused by the right-angle turn of the water flow into the outlet main pipeline, thereby effectively reducing hydraulic loss during the operation of the secondary water supply equipment and also effectively reducing the energy consumption of the secondary water supply equipment. 2. The axial expansion component set in the flexible joint not only changes the waist-drum-shaped inner cavity of the flexible joint to a cylindrical shape, avoiding the phenomenon of vortex caused by the expansion of the diameter of the waist-drum part, thus helping to reduce hydraulic loss, but also ensures that the flexible joint can smoothly connect the corresponding components at both ends, ensuring connection reliability and efficiency. 3. The use of a check valve with a swing-type check plate that rotates at one end to replace the butterfly valve, when the check plate opens the flow channel, the check plate fits against the side wall of the flow channel, avoiding the check structure that is horizontal in the middle of the flow channel and avoiding hydraulic loss caused by the check structure that is horizontal in the middle of the flow channel, thus helping to ensure hydraulic efficiency. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the structure of this utility model.

[0017] Figure 2 yes Figure 1 Another view of the structure is shown in the diagram.

[0018] Figure 3 This is a partial cross-sectional structural schematic diagram of this utility model.

[0019] Figure 4 This is another partial cross-sectional structural schematic diagram of this utility model.

[0020] Figure 5 yes Figure 3 A magnified schematic diagram of a portion of the structure.

[0021] Figure 6 yes Figure 4 A magnified schematic diagram of a portion of the structure.

[0022] Figure 7 This is another partial cross-sectional structural schematic diagram of this utility model.

[0023] Figure 8 yes Figure 7 A magnified schematic diagram of a portion of the structure.

[0024] In the diagram: 1. Water pump; 2. Inlet branch; 3. Outlet branch; 4. Inlet main pipe; 5. Outlet main pipe; 6. Guide block; 7. Flexible joint; 8. First telescopic cylinder; 9. Second telescopic cylinder; 10. Outward flange; 11. Cylinder section; 12. Check valve; 13. Check plate; 14. Pivot; 15. Connecting bend; 16. Ball valve; 17. Eccentric reducing short pipe; 18. Concentric reducing bend; 19. Pressure sensor; 20. Electrical contact pressure gauge; 21. Pressure tank. Detailed Implementation

[0025] The technical solution of this utility model will be further described in detail below through embodiments and in conjunction with the accompanying drawings.

[0026] Example: Figures 1-8 As shown, a secondary water supply device includes several sets of water pumps 1, water flow branches connected to the inlet and outlet of each set of water pumps 1, each water flow branch including an inlet branch 2 and an outlet branch 3, and a main pipeline connected to each of the corresponding water flow branches. The main pipeline includes an inlet main pipe 4 and an outlet main pipe 5 that cooperate with the inlet branch 2 and the outlet branch 3, respectively.

[0027] One difference between this technical solution and existing technologies is that several guide blocks 6 are installed on the inner wall of the main pipeline. Each guide block 6 corresponds to a water flow branch. The outer surface of the guide block 6 facing the water flow branch is spherical, and this spherical surface guides the water flow in and out of the corresponding water flow branch in an arc shape. The guide blocks 6 change the direction of water flow when it enters the inlet branch 2 from the main inlet pipe 4, gradually directing the flow towards the branch 2 and forming a curved flow, thus solving the problem of hydraulic loss caused by the right-angle turn of the water flow into the branch 2. Simultaneously, the guide blocks 6 also change the direction of water flow when it enters the outlet main pipe 5 from the outlet branch 3, gradually bending the flow towards the outlet direction of the main outlet pipe 5, thus solving the problem of hydraulic loss caused by the right-angle turn of the water flow into the outlet main pipe 5. This effectively reduces hydraulic loss during the operation of the secondary water supply equipment and also effectively reduces energy consumption during operation.

[0028] In practical applications, the guide block 6 has a shell-like structure. The guide block 6 is fixed on the inner wall of the main pipeline, and the guide block 6 and the main pipeline form a closed cavity. The shell-like structure of the guide block 6 not only helps to save material consumption, but also helps to ensure assembly reliability and stability. It also makes it easy to adjust the shape so that the water flow channel between the guide block 6, the main pipeline and the corresponding water flow branch is a smooth 90° curved water flow channel.

[0029] In practical applications, the main outlet pipe 5 is equipped with a pressure sensor 19, an electrical contact pressure gauge 20, and a pressure tank 21, all of which are connected to the corresponding water pump 1 via control signals. The pressure sensor 19 is used to detect the water pressure in the main outlet pipe 5 and control the operation of the water pump 1. The electrical contact pressure gauge 20 is used to protect against overpressure in the main outlet pipe 5. The pressure tank 21 is also connected to the pressure sensor 19 and the electrical contact pressure gauge 20 via control signals to regulate the pressure fluctuations of the pressure sensor 19 and the electrical contact pressure gauge 20, so that the pressure signal is smooth and the water hammer wave is absorbed.

[0030] Next, the above technical solution is further improved: the connection end between the water flow branch and the main pipeline is a bend, and the spherical arc surface curvature of the guide block 6 is adapted to the bending amplitude of the connection end, so that the flow channel in the main pipeline and the interior of the corresponding water flow branch form a smooth and curved flow channel.

[0031] In this technical solution, by setting up a bend section and cooperating with the guide block 6, the bending guidance of the bend section and the bending guidance of the outer surface of the guide block 6 can form a smooth and curved water flow channel in the pipe section of the main pipeline corresponding to the bend section and the guide block 6, thereby further solving the problem of water flow loss, further effectively reducing the hydraulic loss when the secondary water supply equipment is working, and effectively reducing the energy consumption when the secondary water supply equipment is working.

[0032] The second difference between this technical solution and the prior art is that: a flexible joint 7 is provided on the water flow branch, and an axial expansion component is provided in the inner cavity of the flexible joint 7. The inner cavity of the axial expansion component is adapted to the inner cavity shape of the corresponding main pipeline. The axial expansion component is used to keep the main pipeline in the inner cavity of the flexible joint 7 cylindrical and to flexibly connect the two ends of the flexible joint 7.

[0033] In this technical solution, the two ends of the flexible joint 7 are used to connect rigid components (such as ball valve 16, eccentric reducing short pipe 17, or rigid water pipe, etc.). Due to the flexible characteristics of the flexible joint 7, the coaxiality requirement of the rigid components connected at both ends is reduced during connection, thus facilitating efficient connection. Since the inner cavity of the flexible joint 7 is bulging outward in the middle and relatively narrow at both ends, the fluid is prone to forming vortices in the outward bulging part of the flexible joint 7. These vortices cause hydraulic losses in the water flow. Therefore, by setting the axial expansion component, not only can the inner cavity of the flexible joint 7 be changed from a drum shape to a cylindrical shape, avoiding the phenomenon of vortices caused by the expansion of the diameter of the drum-shaped part, thus helping to reduce hydraulic losses, but it also ensures that the flexible joint 7 can smoothly connect the corresponding components at both ends, ensuring connection reliability and efficiency.

[0034] In practical applications, the axial telescopic assembly includes a first telescopic cylinder 8 and a second telescopic cylinder 9 that are plugged into each other. The fixed ends of the first telescopic cylinder 8 and the second telescopic cylinder 9 have outward flanges 10 and are arranged opposite to each other. The outward flanges 10 are clamped between the corresponding components of the main pipeline and are fixedly connected by connectors. The cylindrical portion 11 on the first telescopic cylinder 8 and the cylindrical portion 11 on the second telescopic cylinder 9 are disposed in the inner cavity of the flexible joint 7 and are plugged into each other.

[0035] In this technical solution, after the axial telescopic component is set, the first telescopic cylinder 8 and the second telescopic cylinder 9 can form a certain range of expansion (generally the range is not large, so that the first telescopic cylinder 8 and the second telescopic cylinder 9 can always maintain the plug-in relationship, thereby ensuring that the flow channel in the flexible joint 7 is a cylindrical flow channel, that is, the flow channel formed by the first telescopic cylinder 8 and the second telescopic cylinder 9), so that the flexible joint 7 can smoothly connect the corresponding components at both ends.

[0036] In practical applications, to ensure the reliable cooperation between the first telescopic cylinder 8 and the second telescopic cylinder 9, the axial length of the cylindrical portion 11 of the first telescopic cylinder 8 is greater than the axial length of the cylindrical portion 11 of the second telescopic cylinder 9. The cylindrical portion 11 of the first telescopic cylinder 8 extends from one axial end to the other axial end of the flexible inner cavity of the flexible joint 7, so that the inner cavity of the cylindrical portion 11 of the first telescopic cylinder 8 forms the water flow inner cavity of the corresponding part of the water flow branch. The insertion part of the cylindrical portion 11 of the first telescopic cylinder 8 and the cylindrical portion 11 of the second telescopic cylinder 9 is aligned with the wall part of the flexible joint 7.

[0037] Specifically, the axial length of the cylindrical part 11 of the first telescopic cylinder 8 is greater than the axial length of the cylindrical part 11 of the second telescopic cylinder 9, so that the insertion part between the first telescopic cylinder 8 and the second telescopic cylinder 9 is located in the wall part of the flexible joint 7, avoiding insertion in the cavity part of the flexible joint 7, which helps to ensure more reliable insertion between the first telescopic cylinder 8 and the second telescopic cylinder 9 and avoids separation between them during telescopic process.

[0038] The third difference between this technical solution and the prior art is that: a check valve 12 is provided on the water flow branch, the check valve 12 includes a check valve 12 seat, a pivot 14 is provided on the check valve 12 seat, a check plate 13 is provided on the pivot 14, the pivot 14 is positioned to cooperate with the side of the flow channel in the water flow branch, the shape of the check plate 13 is adapted to the cross-section of the flow channel, the side of the check plate 13 is fixed on the pivot 14, when the check plate 13 opens the flow channel, the check plate 13 fits against the side wall of the flow channel, when the check plate 13 opens to close, the check plate 13 transversely cuts off the flow channel.

[0039] In this technical solution, a check valve 12 with a check plate 13 that rotates at one end to swing is used instead of a butterfly valve. When the check plate 13 opens the flow channel, the check plate 13 fits against the side wall of the flow channel, avoiding being horizontal in the middle of the flow channel. This avoids hydraulic loss caused by the check structure horizontal in the middle of the flow channel, which helps to ensure hydraulic efficiency.

[0040] In practical applications, the water inlet branch 2 includes a connecting bend 15, a ball valve 16, a flexible joint 7, and an eccentric reducing short pipe 17 connected in sequence. The bent end of the connecting bend 15 is connected to the main water inlet pipe 4, and the straight part of the connecting bend 15 is connected to the ball valve 16. One end of the eccentric reducing short pipe 17 is connected to the flexible joint 7, and the other end is connected to the water inlet end of the water pump 1.

[0041] In practical applications, the water outlet branch 3 includes a connecting bend 15, a ball valve 16, a flexible joint 7, and a concentric reducing bend 18 connected in sequence. The bent end of the connecting bend 15 is connected to the main water outlet 5, the straight part of the connecting bend 15 is connected to the ball valve 16, one end of the concentric reducing bend 18 is connected to the flexible joint 7, and the other end is connected to the water outlet end of the water pump 1.

[0042] In practical applications, all components in the inlet branch 2 and the outlet branch 3 are flanged connections, and the outward flange 10 on the flexible joint 7 installed on the water flow branch is clamped and fixed between the flanges on adjacent components.

[0043] The above description is merely a preferred embodiment of the present utility model and is not intended to limit the present utility model. Various modifications and variations can be made to the above embodiments. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A secondary water supply device, comprising a plurality of sets of water pumps (1), water flow branches respectively connected to the inlet and outlet of each set of water pumps (1), each water flow branch including an inlet branch (2) and an outlet branch (3), and a main pipeline respectively connected to each of the corresponding water flow branches, the main pipeline including an inlet main pipe (4) and an outlet main pipe (5) respectively cooperating with the inlet branch (2) and the outlet branch (3), characterized in that Several guide blocks (6) are provided on the inner wall of the main pipeline. Each guide block (6) corresponds to a water flow branch. The outer surface of the guide block (6) facing the water flow branch is spherical. The spherical surface of the guide block (6) is used to guide the water flow in and out of the corresponding water flow branch in an arc shape.

2. The secondary water supply equipment according to claim 1, characterized in that... The connection end between the water flow branch and the main pipeline is a bend. The spherical arc surface curvature of the guide block (6) is adapted to the bending amplitude of the connection end, so that the flow channel in the main pipeline and the interior of the corresponding water flow branch form a smooth and curved flow channel.

3. The secondary water supply equipment according to claim 1, characterized in that... A flexible joint (7) is provided on the water flow branch. An axial expansion component is provided in the inner cavity of the flexible joint (7). The inner cavity of the axial expansion component is adapted to the inner cavity shape of the corresponding main pipeline. The axial expansion component is used to keep the main pipeline cylindrical in the inner cavity of the flexible joint (7) and to make the two ends of the flexible joint (7) flexibly connected.

4. The secondary water supply equipment according to claim 3, characterized in that... The axial telescopic assembly includes a first telescopic cylinder (8) and a second telescopic cylinder (9) that are inserted into each other. The fixed ends of the first telescopic cylinder (8) and the second telescopic cylinder (9) have outward flanges (10) and are set opposite to each other. The outward flanges (10) are clamped between the corresponding components of the main pipeline and form a fixed connection through the connector. The cylindrical part (11) on the first telescopic cylinder (8) and the cylindrical part (11) on the second telescopic cylinder (9) are disposed in the inner cavity of the flexible joint (7) and are inserted into each other.

5. The secondary water supply equipment according to claim 4, characterized in that... The axial length of the cylindrical part (11) of the first telescopic cylinder (8) is greater than the axial length of the cylindrical part (11) of the second telescopic cylinder (9). The cylindrical part (11) of the first telescopic cylinder (8) extends from one axial end of the flexible inner cavity of the flexible joint (7) to the other axial end, so that the inner cavity of the cylindrical part (11) of the first telescopic cylinder (8) forms the water flow inner cavity of the corresponding part of the water flow branch. The insertion part of the cylindrical part (11) of the first telescopic cylinder (8) and the cylindrical part (11) of the second telescopic cylinder (9) is engaged with the wall part of the flexible joint (7).

6. The secondary water supply equipment according to any one of claims 1-5, characterized in that... A check valve (12) is provided on the water flow branch. The check valve (12) includes a check valve (12) seat and a pivot (14) on the check valve (12) seat. A check plate (13) is provided on the pivot (14). The pivot (14) is positioned to match the side of the flow channel in the water flow branch. The shape of the check plate (13) is adapted to the cross-section of the flow channel. The side of the check plate (13) is fixed on the pivot (14). When the check plate (13) opens the flow channel, the check plate (13) fits against the side wall of the flow channel. When the check plate (13) opens to close, the check plate (13) cuts off the flow channel laterally.

7. The secondary water supply equipment according to claim 6, characterized in that... The water inlet branch (2) includes a connecting bend (15), a ball valve (16), a flexible joint (7), and an eccentric reducing short pipe (17) connected in sequence. The bent end of the connecting bend (15) is connected to the main water inlet pipe (4), and the straight part of the connecting bend (15) is connected to the ball valve (16). One end of the eccentric reducing short pipe (17) is connected to the flexible joint (7), and the other end is connected to the water inlet end of the water pump (1).

8. The secondary water supply equipment according to claim 6, characterized in that... The outlet branch (3) includes a connecting bend (15), a ball valve (16), a flexible joint (7), and a concentric reducing bend (18) connected in sequence. The bent end of the connecting bend (15) is connected to the outlet main pipe (5), and the straight part of the connecting bend (15) is connected to the ball valve (16). One end of the concentric reducing bend (18) is connected to the flexible joint (7), and the other end is connected to the outlet end of the water pump (1).

9. The secondary water supply equipment according to claim 8, characterized in that... All components in the inlet branch (2) and the outlet branch (3) are connected by flanges. The outer flange (10) on the flexible joint (7) provided on the water flow branch is clamped and fixed between the flanges on the adjacent components.

10. The secondary water supply equipment according to claim 6, characterized in that... The main outlet pipe (5) is equipped with a pressure sensor (19), an electric contact pressure gauge (20), and a pressure tank (21), all of which are connected to the corresponding water pump (1) via control signals. The pressure sensor (19) is used to detect the water pressure in the main outlet pipe (5) and control the operation of the water pump (1). The electric contact pressure gauge (20) is used to protect against overpressure in the main outlet pipe (5). The pressure tank (21) is also connected to the control signals of the pressure sensor (19) and the electric contact pressure gauge (20) to adjust the pressure fluctuations of the pressure sensor (19) and the electric contact pressure gauge (20), so that the pressure signal is smooth and the water hammer wave is absorbed.

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