Device and method for testing hydraulic friction resistance of alarm valve

Abstract

The invention relates to the technical field of hydraulic friction resistance testing, and discloses an alarm valve hydraulic friction resistance testing device and a method thereof.The alarm valve hydraulic friction resistance testing device comprises a testing table, a first gate valve, a processing screen and a second gate valve. When water is mixed in the cavity chamber, generated reverse force enables the limiting block on one side to be in an opening and swinging state, water power is blocked and does not easily flow back to penetrate through the limiting block, and the situation that the friction resistance test of the differential pressure measurer in the horizontal pipe is affected by water backflow is prevented; and the magnet strip and the magnet in the fixing ring repel each other and shake, so that the impact force of water after the friction resistance test is reduced, the water flow is buffered by the limiting block and the buffer structure, and meanwhile, the backflow caused by the hedging of the left and right sides of the water flow is reduced, and the influence of the water backflow on the friction resistance test structure is prevented.

Description

Technical Field

[0001] The invention relates to the technical field of hydraulic friction test, in particular to an alarm valve hydraulic friction test device and a method thereof. Background Art

[0002] The alarm valve is installed in the sample pipeline and opened to the "fully open" position. The distance between the pressure holes on both sides of the valve is equal to the distance between the pressure holes in the straight pipe section. The water flow rate through the valve is maintained at a certain value. The pressure difference between the pressure holes on both sides of the valve and the pressure difference of the pressure control in the straight pipe section are measured by the differential pressure measuring device, and the hydraulic friction resistance is obtained by subtracting them. However, when hydraulic circulation is carried out in multiple pipes for friction resistance test, the water flows in multiple pipes are easy to mix and impact each other and interfere with the flow direction, and then when water in different directions impacts each other, it is easy for the water to flow back to one side. Therefore, the backflow of water is easy to increase the pressure of the subsequent circulating water and affect the detection of the differential pressure detector, and it is easy to cause the value of the friction resistance test to deviate and affect the test results. Summary of the invention

[0003] The present invention provides an alarm valve hydraulic friction test device and method thereof, which overcome the shortcomings described in the background technology.

[0004] The technical solution adopted by the present invention to solve its technical problem is: A hydraulic friction test device for an alarm valve comprises a test bench, a first gate valve, a processing screen and a second gate valve, wherein the first gate valve is arranged inside the test bench, the second gate valve is embedded in the test bench and connected to the first gate valve pipeline, the processing screen is arranged on the surface of the test bench and connected to the electrical signal in the test bench, the upper end of the second gate valve is connected to the external alarm valve pipeline, the pipeline diameter of the second gate valve decreases from left to right, and four second gate valves of the same size are provided and arranged equidistantly; The test bench is provided with a pipe arrangement structure, a metal pipe, a flow meter and a water outlet pipe. The upper and lower ends of the pipe arrangement structure are respectively connected to the lower end of the second gate valve and the upper end of the metal pipe. The flow meter is arranged on the side of the metal pipe, and the flow meter is connected in series with the electrical signal of the processing screen. The lower end of the metal pipe is connected to the water outlet pipe, and the water outlet pipe is connected to the first external gate valve. The metal pipe is provided with a plurality of pipes, and the pipe arrangement structure at the upper end of each metal pipe is connected with four second gate valves of the same diameter. The four second gate valves are respectively connected to multiple or single alarm valve pipes, and the four second gate valves introduce hydraulic pressure into the alarm valve and introduce friction test into the pipe arrangement structure. The pipe arrangement structure is provided with a joint pipe, a test pipe, a differential pressure measuring device and a sealing connecting pipe. The joint pipe is arranged at the middle lower end of the test pipe. The upper end of the test pipe is provided with four equidistantly arranged sealing connecting pipes, and a corresponding differential pressure measuring device is provided on the inner side of the test pipe directly below each sealing connecting pipe. Another differential pressure measuring device is provided toward the middle of the test pipe with a distance equal to the diameter of the test pipe. The two differential pressure measuring devices detect the water pressure difference and transmit the electrical signal to the processing screen.

[0005] A better technical solution: the test tube is provided with a horizontal tube, a cavity, a conduit, a limit block and a buffer structure, the buffer structure is located inside the cavity and is arranged on the inner side of the middle of the horizontal tube, the conduit is arranged at the lower end of the middle of the horizontal tube, and the cavity in the middle of the horizontal tube is located directly above the conduit, the limit block is arranged on the inner side of the horizontal tube, and two limit blocks are provided and symmetrically distributed with the cavity as the center, the four sealing connecting pipes arranged at the upper end of the horizontal tube pass water from the left and right sides of the horizontal tube to the cavity, and when water flows, the water passes through the limit block on one side under the flow inertia and enters the cavity.

[0006] A preferred technical solution: A limit block is provided at the lower end of each metal tube near the machine, and the limit block in the metal tube prevents the water in the machine from flowing back quickly upward.

[0007] A better technical solution: the limit block is provided with a fixed ring, a support frame, a fixed ring and a rotating plate. The fixed ring is fitted on the inner side of the fixed ring. The support frame is arranged in a "cross" shape on the inner side of the fixed ring. There are four rotating plates, and the four rotating plates are distributed in a ring and fit on the side of the support frame. Each rotating plate repels and swings against the side of the fixed ring.

[0008] A better technical solution: the rotating plate is provided with a fan-shaped plate, a magnet strip, and a rubber strip. The magnet strip is arranged at the arc-shaped edge of the fan-shaped plate. A magnet is arranged inside the fixed ring corresponding to the magnet strip. The magnet and the magnet strip have the same magnetic properties and repel movement, and open the side gap between the fan-shaped plate and the fixed ring. The fan-shaped plate is arranged on the side of the rubber strip, and the rubber strip is attached to the side of the support frame. The fan-shaped plate is curved in an arc with the rubber strip as the center.

[0009] A preferred technical solution: There are eight fan-shaped plates, and every two of the fan-shaped plates form a quarter of the size of a circle. When water flows into the fixed ring, the two fan-shaped plates bend and swing around the rubber strip.

[0010] A preferred technical solution: the buffer structure is provided with a corrugated rod, a rubber plate, and a circular hole. The corrugated rod is provided with sixteen and is symmetrically distributed on the left and right sides of the circular hole. The outer third of the upper half of the circular hole is arranged on the inner side of the horizontal tube. The rubber plate is located inside the circular hole, and the limit blocks on the left and right sides of the cavity move toward the buffer structure. The water passes through the circular hole in the rubber plate and drives the rubber plate to swing.

[0011] Based on the above content, the present invention also proposes a test method for a hydraulic friction device of an alarm valve, the test method comprising the following specific steps: S1: First, the alarm valve pipeline is connected to the second gate valve and the valve switch is opened, and the valve of the first gate valve on the side of the test bench is manually opened and closed. After water is passed through the alarm valve, water flows through the second gate valve into the drainage structure in the test bench, and the friction resistance is tested at the drainage structure position; S2: When the water is tested for friction resistance in the pipe structure, the water flows from the sealed pipe to the test pipe, and the four sealed pipes are used to simulate the state of hydraulic flow. The flow conditions of the four sealed pipes include the following three conditions: the two sealed pipes on one side of the test pipe guide the water in the same direction and interfere with each other; a single sealed pipe flows in the test pipe; the sealed pipes on the left and right sides of the test pipe guide the water to the middle of the test pipe and impact each other. The two differential pressure measuring devices under the sealed pipe in the test pipe are used to test the water flow conditions in the three conditions. Therefore, during the friction resistance test, water enters the test pipe from the sealed pipe and vertically impacts the differential pressure measuring device directly below and tests the differential pressure. The differential pressure of the water flowing to the middle of the test pipe after being blocked is detected by another differential pressure measuring device. The differential pressure of the differential pressure measuring device directly below the sealed pipe is subtracted from the differential pressure of the other differential pressure measuring device to obtain the friction resistance value. S3: When the water on one side of the test tube flows to the middle of the test tube, the water pushes the limit block on one side to enter the cavity, and flows relatively smoothly in the cavity under the obstruction of the buffer structure, so that the water turns to the direction of the guide tube and flows from the joint pipe into the metal pipe. When the water flows from the left and right sides of the horizontal pipe to the cavity position, the water flows on the left and right sides pass through the buffer structure of the limit block in the cavity and impact each other. The irregular impact of the water flows on the left and right sides is slowed down under the obstruction and swing of the buffer structure.

[0012] S4: When water flows to the limit block, it pushes the fan-shaped plate to bend and swing with the rubber strip as the central axis, and reduces the resistance to water flow through the deformation of the fan-shaped plate to prevent the impact on the friction test of the pressure difference measuring device in the test tube. At the same time, water hits the fan-shaped plate from the other side in the opposite direction, and the magnet strip on the fan-shaped plate repels the fixed ring to make the fan-shaped plate open and swing, slowing down the impact of water flow on the left and right sides, preventing water from flowing back into one side, and then the water is buffered in the cavity and turned to flow into the conduit.

[0013] S5: The four sealed connecting pipes and the test pipe form three flow conditions, and the pressure difference detection is performed on the different flow conditions of water. The water flows from the middle of the test pipe to the metal pipe at the lower end, and the flow meter on the side of the metal pipe measures the water flow, so that the water is discharged in the outlet pipe toward the first gate valve.

[0014] Compared with the prior art, this technical solution has the following advantages: When a single alarm valve is connected to the two sealed pipes on the same side and in the same direction for water to flow, the water passes through the limit block on one side of the horizontal pipe, and the limit block on the other side blocks and guides the water to flow to the conduit, thereby preventing the water from flowing back to the other side of the horizontal pipe. When the water flows from the left and right sides of the test pipe to the middle of the empty chamber, the water flows through the two limit blocks and enters the empty chamber. The reverse force generated when the water is mixed in the empty chamber causes the limit block on one side to be in an open swinging state. At this time, the water force is blocked and it is not easy to flow back through the limit block, thereby preventing the backflow of water from affecting the friction test of the pressure difference measuring device in the horizontal pipe.

[0015] When water flows in the present invention, the two fan-shaped plates are pushed to bend and swing with their respective corresponding rubber strips, and the magnet strips and the magnets in the fixed ring repel and shake each other, thereby reducing the impact force of water after the friction test, wherein the impact force at the position of the limit block under the flow inertia of water is small and does not affect the pressure difference detection of water by the pressure difference measuring device in the horizontal pipe, so that water flows out stably from the four rotating plates on the side of the support frame, and when the water hits the fan-shaped plate on the other side, it drives the magnet strips on the fan-shaped plate to repel the magnets in the fixed ring, so that the fan-shaped plate shakes while preventing water from flowing back. Therefore, the present invention reduces the backflow caused by the impact of the left and right sides of the water flow while buffering the water flow with the limit block and the buffer structure, thereby preventing water backflow from affecting the friction test structure. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] The present invention will be further described below in conjunction with the accompanying drawings and embodiments.

[0017] Figure 1 This is an overall diagram of the present invention.

[0018] Figure 2 A side view of the test bench.

[0019] Figure 3 It is a three-dimensional schematic diagram of the pipe arrangement structure.

[0020] Figure 4 A schematic cross-sectional view of the test tube.

[0021] Figure 5 A side view of the test tube.

[0022] Figure 6 It is a three-dimensional schematic diagram of the limit block.

[0023] Figure 7A three-dimensional schematic diagram of a rotating plate.

[0024] Figure 8 A three-dimensional schematic diagram of the buffer structure.

[0025] In the figure: test bench-1, first gate valve-2, processing screen-3, second gate valve-4, pipe structure-11, metal pipe-12, flow meter-13, water outlet pipe-14, machine-15.

[0026] Connecting pipe-111, testing pipe-112, differential pressure measuring device-113, sealing connecting pipe-114.

[0027] Horizontal tube-21, cavity-22, conduit-23, limit block-24, buffer structure-25.

[0028] Fixed ring-241, support frame-242, fixed ring-243, rotating plate-244.

[0029] Fan-shaped plate-2441, magnet strip-2442, rubber strip-2443.

[0030] Corrugated rod-251, rubber sheet-252, round hole-253. DETAILED DESCRIPTION

[0031] like Figures 1 to 8 As shown, the present invention proposes an alarm valve hydraulic friction test device, including a test bench 1, a first gate valve 2, a processing screen 3 and a second gate valve 4, wherein the first gate valve 2 is arranged inside the test bench 1, the second gate valve 4 is embedded in the test bench 1 and connected to the first gate valve 2 pipeline, the processing screen 3 is arranged on the surface of the test bench 1 and connected to the electrical signal in the test bench 1, the upper end of the second gate valve 4 is connected to the external alarm valve pipeline, the pipeline diameter of the second gate valve 4 decreases from left to right, and four second gate valves 4 of the same size are provided and arranged equidistantly; The test bench 1 is provided with a pipe arrangement structure 11, a metal pipe 12, a flowmeter 13 and a water outlet pipe 14. The upper and lower ends of the pipe arrangement structure 11 are respectively connected to the lower end of the second gate valve 4 and the upper end of the metal pipe 12. The flowmeter 13 is arranged on the side of the metal pipe 12, and the flowmeter 13 is connected in series with the electrical signal of the processing screen 3. The lower end of the metal pipe 12 is connected to the water outlet pipe 14, and the water outlet pipe 14 is connected to the external first gate valve 2. There are several metal pipes 12, and the pipe arrangement structure 11 at the upper end of each metal pipe 12 is connected to four second gate valves 4 of the same diameter. The four second gate valves 4 are respectively connected to multiple or single alarm valve pipelines, and the four second gate valves 4 introduce hydraulic pressure into the alarm valve and are introduced into the pipe arrangement structure 11 for friction resistance testing.

[0032] In addition, the alarm valve connected to the second gate valve 4 is suitable for alarm valves such as wet alarm valves, dry alarm valves, deluge alarm valves, fire signal butterfly valves and action devices, and according to the different diameters of the second gate valve 4, it is suitable for alarm valve products with DN25, 32, 40, 50, 65, 80, 100, 125, 150, 200, and 250 calibers.

[0033] Among them, the pipe arrangement structure 11 is provided with a joint pipe 111, a test pipe 112, a pressure difference measuring device 113 and a sealing pipe 114. The joint pipe 111 is arranged at the middle lower end of the test pipe 112. The upper end of the test pipe 112 is provided with four equidistantly arranged sealing pipes 114, and the inner side of the test pipe 112 directly below each sealing pipe 114 is provided with a corresponding pressure difference measuring device 113. In addition, another pressure difference measuring device 113 with a diameter of the test pipe 112 is provided toward the middle direction of the test pipe 112. The two pressure difference measuring devices 113 detect the water pressure difference and transmit the electrical signal to the processing screen 3, and obtain the friction data by subtracting the water pressure difference.

[0034] Among them, the test tube 112 is provided with a horizontal tube 21, a cavity 22, a conduit 23, a limit block 24 and a buffer structure 25. The buffer structure 25 is located inside the cavity 22 and is arranged on the inner side of the middle of the horizontal tube 21. The conduit 23 is arranged at the lower end of the middle of the horizontal tube 21, and the cavity 22 in the middle of the horizontal tube 21 is located directly above the conduit 23. The limit block 24 is arranged on the inner side of the horizontal tube 21, and two limit blocks 24 are provided and symmetrically distributed with the cavity 22 as the center. The four sealing connecting pipes 114 arranged at the upper end of the horizontal tube 21 pass water from the left and right sides of the horizontal tube 21 to the cavity 22. When water flows, the water passes through the limit block 24 on one side under the flow inertia and enters the cavity 22.

[0035] In addition, a limit block 24 is provided at the lower end of each metal tube 12 near the machine platform 15 , and the limit block 24 in the metal tube 12 prevents the water in the machine platform 15 from flowing back quickly upward.

[0036] Among them, the limit block 24 is provided with a fixed ring 241, a support frame 242, a fixed ring 243 and a rotating plate 244. The fixed ring 241 is arranged on the inner side of the fixed ring 243, and the support frame 242 is arranged on the inner side of the fixed ring 241 in a "cross" shape. There are four rotating plates 244, and the four rotating plates 244 are distributed in a ring and fitted on the side of the support frame 242. Each rotating plate 244 repels and swings with the side of the fixed ring 241.

[0037] In the present invention, when a single alarm valve or multiple alarm valves are connected to the second gate valve 4, the following three situations are formed for friction test: that is, the two sealed pipes 114 on the same side and in the same direction flow into the test pipe 112 to interfere with each other; water flows from the left and right sides of the test pipe 112 to the middle, and a single sealed pipe 114 is connected to the alarm valve to flow to the middle of the test pipe 112. When a single alarm valve is connected and two sealed pipes 114 on the same side and in the same direction flow water, water passes through the limit block 24 on one side of the horizontal pipe 21 and flows in the horizontal pipe 21. The limit block 24 on the other side blocks and guides the water to flow toward the conduit 23, preventing the water from flowing back to the other side of the horizontal tube 21. When the water flows from the left and right sides of the test tube 112 to the middle of the empty chamber, the water flows through the two limit blocks 24 and enters the empty chamber 22. The reverse force generated when the water is mixed in the empty chamber 22 causes the limit block 24 on one side to be in an open swinging state. At this time, the water force is blocked and it is not easy to flow back through the limit block 24, preventing the backflow of water from affecting the friction test of the differential pressure measuring device 113 in the horizontal tube 21.

[0038] Among them, the rotating plate 244 is provided with a fan-shaped plate 2441, a magnet strip 2442, and a rubber strip 2443. The magnet strip 2442 is arranged at the arc edge of the fan-shaped plate 2441. A magnet is arranged inside the fixed ring 241 corresponding to the magnet strip 2442. The magnet and the magnet strip 2442 have the same magnetic properties and repel movement, and open the side gap between the fan-shaped plate 2441 and the fixed ring 241. The fan-shaped plate 2441 is arranged on the side of the rubber strip 2443, and the rubber strip 2443 is attached to the side of the support frame 242. The fan-shaped plate 2441 is curved with the rubber strip 2443 as the center.

[0039] In addition, eight fan-shaped plates 2441 are provided, and every two fan-shaped plates 2441 form a quarter of the size of a circle. When water flows toward the fixing ring 241 , the two fan-shaped plates 2441 bend and swing around the rubber strip 2443 .

[0040] Among them, the buffer structure 25 is provided with a corrugated rod 251, a rubber plate 252, and a circular hole 253. There are sixteen corrugated rods 251, which are symmetrically distributed on the left and right sides of the circular hole 253. One-third of the outer side of the upper half of the circular hole 253 is arranged on the inner side of the horizontal tube 21. The rubber plate 252 is located inside the circular hole 253, and the limit blocks 24 on the left and right sides of the cavity 22 move water toward the buffer structure 25. Water passes through the circular hole 253 in the rubber plate 252 and drives the rubber plate 252 to swing.

[0041] In the present invention, when water flows from the left and right sides toward the buffer structure 25, the water impacts the arc-shaped block on the corrugated rod 251, and the corrugated rod 251 is driven to shake under the flow force of the water, while the rubber plate 252 swings left and right, so that the movement of the rubber plate 252 and the corrugated rod 251 buffers the impact of the water flow on the left and right sides, and makes the water flow smoothly flow through the circular hole 253 and merge, so that the buffer structure 25 in the cavity 22 reduces the impact force of the water and guides it to the conduit 23, thereby avoiding the situation that the water flows back from one side of the cavity 22.

[0042] When water flows in the present invention, the two fan-shaped plates 2441 are pushed to bend and swing with their corresponding rubber strips 2443, and the magnet strip 2442 and the magnet in the fixed ring 241 repel and shake each other, thereby reducing the impact force of the water after the friction test. Under the inertia of water flow, the impact force at the position of the limit block 24 is small and does not affect the pressure difference detection of water by the pressure difference measuring device 113 in the horizontal tube 21. Therefore, water flows out steadily on the four rotating plates 244 on the side of the support frame 242. When the water hits the fan-shaped plate 2441 on the other side, it drives the magnet strip 2442 on the fan-shaped plate 2441 to repel the magnet in the fixed ring 241, so that the fan-shaped plate 2441 shakes while preventing water from flowing back. Therefore, the present invention reduces the backflow caused by the impact of the left and right sides of the water flow while buffering the water flow with the limit block 24 and the buffer structure 25, thereby preventing water backflow from affecting the friction test structure.

[0043] Based on the above content, the present invention also proposes a test method for a hydraulic friction device of an alarm valve, the test method comprising the following specific steps: S1: First, the alarm valve pipeline is connected to the second gate valve 4 and the valve switch is opened, and the valve of the first gate valve 2 on the side of the test bench 1 is manually opened and closed. After water is passed through the alarm valve, water flows through the second gate valve 4 into the pipe structure 11 in the test bench 1, and the friction resistance test is carried out at the position of the pipe structure 11; S2: When the water is tested for friction in the pipe structure 11, the water flows from the sealing pipe 114 to the test pipe 112, and the four sealing pipes 114 simulate the state of hydraulic flow. The flow conditions of the four sealing pipes 114 include the following three conditions: two sealing pipes 114 on one side of the test pipe 112 guide water in the same direction and interfere with each other; a single sealing pipe 114 flows in the test pipe 112; the sealing pipes 114 on the left and right sides of the test pipe 112 guide water to the middle of the test pipe 112 and counteract each other. The friction resistance test of the water flow state in three cases is performed by two differential pressure measuring devices 113 below the sealed pipe 114 in the test pipe 112. Therefore, during the friction resistance test, water enters the test pipe 112 from the sealed pipe 114 and vertically impacts the differential pressure measuring device 113 directly below to test the differential pressure. The differential pressure of the water blocked in the test pipe 112 flowing to the middle is detected by the other differential pressure measuring device 113. The differential pressure of the differential pressure measuring device 113 directly below the sealed pipe 114 is subtracted from the differential pressure of the other differential pressure measuring device 113 to obtain the friction resistance value. S3: When the water on one side of the test tube 112 flows toward the middle of the test tube 112, the water pushes away the limit block 24 on one side and enters the cavity 22, and flows relatively smoothly in the cavity 22 under the obstruction of the buffer structure 25, so that the water turns toward the direction of the guide tube 23 and flows into the metal tube 12 from the joint pipe 111. When the water flows from the left and right sides of the horizontal tube 21 to the position of the cavity 22, the water flows on the left and right sides pass through the buffer structure 25 of the limit block 24 in the cavity 22 and impact each other, and the irregular impact of the water flows on the left and right sides is slowed down under the obstruction and swing of the buffer structure 25.

[0044] S4: When water flows to the limit block 24, the fan plate 2441 is pushed to bend and swing with the rubber strip 2443 as the central axis, and the fan plate 2441 is deformed and moved to reduce the flow resistance of water, thereby preventing the pressure difference measuring device 113 in the test tube 112 from affecting the friction test of the water force. At the same time, water impacts the fan plate 2441 from the other side in the opposite direction, and the magnet strip 2442 on the fan plate 2441 repels the fixing ring 241 to make the fan plate 2441 open and swing, thereby slowing down the impact of water flow on the left and right sides, preventing water from flowing back into one side, and then the water is buffered in the cavity 22 and then turned to flow to the conduit 23.

[0045] S5: The four sealed connecting pipes 114 and the test pipe 112 form three flow conditions, and the pressure difference detection is performed on the different flow conditions of water. The water flows from the middle of the test pipe 112 to the metal pipe 12 at the lower end of 115, and the flow meter 13 on the side of the metal pipe 12 measures the water flow, so that the water is discharged in the outlet pipe 14 toward the first gate valve 2.

[0046] The above description is only a preferred embodiment of the present invention, and therefore cannot be used to limit the scope of the present invention. That is, equivalent changes and modifications made according to the patent scope of the present invention and the contents of the specification should still fall within the scope of the present invention.

Claims

1. A hydraulic friction test device for an alarm valve, characterized in that: The invention comprises a test bench (1), a first gate valve (2), a processing screen (3) and a second gate valve (4), wherein the first gate valve (2) is arranged inside the test bench (1), the second gate valve (4) is embedded in the test bench (1) and connected to the first gate valve (2) through a pipeline, the processing screen (3) is arranged on the surface of the test bench (1) and connected to an electrical signal inside the test bench (1), the upper end of the second gate valve (4) is connected to an external alarm valve pipeline, the pipeline diameters of the second gate valve (4) decrease from left to right, and four second gate valves (4) of the same size are provided and arranged equidistantly; The test bench (1) is provided with a pipe arrangement (11), a metal pipe (12), a flow meter (13) and a water outlet pipe (14); the upper and lower ends of the pipe arrangement (11) are respectively connected to the lower end of the second gate valve (4) and the upper end of the metal pipe (12); the flow meter (13) is arranged on the side of the metal pipe (12), and the flow meter (13) is connected in series with the processing screen (3) in terms of electrical signals; the lower end of the metal pipe (12) is connected to the water outlet pipe (14), and the water outlet pipe (14) is connected to an external first gate valve (2); a plurality of metal pipes (12) are provided, and the pipe arrangement (11) at the upper end of each metal pipe (12) is connected to four second gate valves (4) of the same diameter; the four second gate valves (4) are respectively connected to multiple or single alarm valve pipes; and the four second gate valves (4) introduce hydraulic pressure into the alarm valve and are introduced into the pipe arrangement (11) for internal friction resistance testing; The pipe arrangement structure (11) is provided with a joint pipe (111), a test pipe (112), a differential pressure measuring device (113) and a sealing pipe (114); the joint pipe (111) is arranged at the middle lower end of the test pipe (112); the upper end of the test pipe (112) is provided with four equidistantly arranged sealing pipes (114); the inner side of the test pipe (112) directly below each sealing pipe (114) is provided with a corresponding differential pressure measuring device (113); and another differential pressure measuring device (113) is provided in the direction of the middle of the test pipe (112) at a distance equal to the diameter of the test pipe (112); the two differential pressure measuring devices (113) detect the water pressure difference and transmit the electrical signal to the processing screen (3).

2. The hydraulic friction test device for an alarm valve according to claim 1, characterized in that: The test tube (112) is provided with a horizontal tube (21), a cavity (22), a conduit (23), a stopper (24) and a buffer structure (25); the buffer structure (25) is located inside the cavity (22) and is arranged inside the middle of the horizontal tube (21); the conduit (23) is arranged at the lower end of the middle of the horizontal tube (21); the cavity (22) in the middle of the horizontal tube (21) is located directly above the conduit (23); the stopper (24) is arranged inside the horizontal tube (21); two stopper blocks (24) are provided and are symmetrically distributed with the cavity (22) as the center; four sealing pipes (114) provided at the upper end of the horizontal tube (21) flow water from the left and right sides of the horizontal tube (21) toward the cavity (22); when water flows, the water passes through the stopper (24) on one side under the inertia of the flow and enters the cavity (22).

3. The hydraulic friction test device for an alarm valve according to claim 2, characterized in that: The limit block (24) is provided with a fixing ring (241), a support frame (242), a fixing ring (243) and a rotating plate (244); the fixing ring (241) is arranged in close contact with the inner side of the fixing ring (243); the supporting frame (242) is arranged in a "cross" shape in the inner side of the fixing ring (241); four rotating plates (244) are provided, and the four rotating plates (244) are distributed in an annular shape and in close contact with the side of the supporting frame (242); each rotating plate (244) repel and swing against the side of the fixing ring (241).

4. The hydraulic friction test device for an alarm valve according to claim 3, characterized in that: The rotating plate (244) is provided with a fan-shaped plate (2441), a magnet strip (2442), and a rubber strip (2443); the magnet strip (2442) is arranged at the arc edge of the fan-shaped plate (2441); a magnet is arranged inside the fixing ring (241) at a position corresponding to the magnet strip (2442); the magnet and the magnet strip (2442) have the same magnetic properties and repel each other, and open a gap between the side edges of the fan-shaped plate (2441) and the fixing ring (241); the fan-shaped plate (2441) is arranged on the side of the rubber strip (2443), and the rubber strip (2443) is attached to the side of the support frame (242); and the fan-shaped plate (2441) is curved in an arc shape with the rubber strip (2443) as the center.

5. The hydraulic friction test device for an alarm valve according to claim 4, characterized in that: There are eight fan-shaped plates (2441), and every two of the fan-shaped plates (2441) form a quarter of the size of a circle. When water flows toward the fixing ring (241), the two fan-shaped plates (2441) bend and swing around the rubber strip (2443).

6. The hydraulic friction test device for an alarm valve according to claim 2, characterized in that: The buffer structure (25) is provided with a corrugated rod (251), a rubber plate (252), and a circular hole (253). The corrugated rod (251) is provided with sixteen and is symmetrically distributed on the left and right sides of the circular hole (253). One third of the outer side of the upper half of the circular hole (253) is arranged inside the horizontal tube (21). The rubber plate (252) is located inside the circular hole (253). The limit blocks (24) on the left and right sides of the hollow chamber (22) move water toward the buffer structure (25). The water passes through the circular hole (253) in the rubber plate (252) and drives the rubber plate (252) to swing.

7. A testing method for the hydraulic friction test device of an alarm valve according to claim 5, characterized in that: The test method comprises the following specific steps: S1: First, the alarm valve pipeline is connected to the second gate valve (4) and the valve switch is opened, and the valve of the first gate valve (2) on the side of the test bench (1) is manually opened and closed. After water is passed through the alarm valve, the water flows through the second gate valve (4) into the pipe arrangement structure (11) in the test bench (1), and a friction test is performed at the position of the pipe arrangement structure (11); S2: When water is tested for friction resistance in the pipe structure (11), water flows from the sealing pipe (114) to the test pipe (112), and the four sealing pipes (114) simulate the state of hydraulic flow. The flow conditions of the four sealing pipes (114) include the following three conditions: two sealing pipes (114) on one side of the test pipe (112) guide water in the same direction and interfere with each other; or a single sealing pipe (114) flows in the test pipe (112); or the sealing pipes (114) on the left and right sides of the test pipe (112) guide water to the middle of the test pipe (112) and interfere with each other. The friction resistance test is performed on the water flow states of the three conditions through two differential pressure measuring devices (113) below the sealed pipe (114) in the test pipe (112). Therefore, during the friction resistance test, water enters the test pipe (112) from the sealed pipe (114) and vertically impacts the differential pressure measuring device (113) directly below and tests the differential pressure. The differential pressure of the water flowing through the test pipe (112) after being blocked is detected by the other differential pressure measuring device (113). The differential pressure of the differential pressure measuring device (113) directly below the sealed pipe (114) is subtracted from the differential pressure of the other differential pressure measuring device (113) to obtain the friction resistance value. S3: When water on one side of the test tube (112) flows toward the middle of the test tube (112), the water pushes away the limit block (24) on one side and enters the hollow chamber (22), and flows relatively smoothly in the hollow chamber (22) under the obstruction of the buffer structure (25), so that the water turns toward the direction of the guide tube (23) and flows from the joint pipe (111) into the metal pipe (12). When water flows from the left and right sides of the horizontal pipe (21) toward the hollow chamber (22), the water flows on the left and right sides pass through the buffer structure (25) in the hollow chamber (22) of the limit block (24) and impact each other. The irregular impact of the water flows on the left and right sides is slowed down under the obstruction and swing of the buffer structure (25); S4: When water flows to the limit block (24), the fan-shaped plate (2441) is pushed to bend and swing with the rubber strip (2443) as the central axis. The fan-shaped plate (2441) is deformed and moved to reduce the flow resistance of water, thereby preventing the influence on the friction test of the pressure difference measuring device (113) in the test tube (112). At the same time, the water strikes the fan-shaped plate (2441) from the other side in the opposite direction. The magnet strip (2442) on the fan-shaped plate (2441) and the fixing ring (241) repel each other, causing the fan-shaped plate (2441) to open and swing, thereby slowing down the impact of water flow on the left and right sides, preventing water from flowing back into one side, and then the water is buffered in the cavity (22) and then turns to flow toward the guide tube (23); S5: The four sealed connecting pipes (114) and the test pipe (112) form three flow conditions, and pressure difference detection is performed on the different flow conditions of water. Water flows from the middle of the test pipe (112) to the metal pipe (12) at the lower end (115), and the flow meter (13) on the side of the metal pipe (12) measures the water flow rate, so that the water is discharged in the outlet pipe (14) toward the first gate valve (2).

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