A test device and test method for sand-laden seawater erosion of valve ports

Abstract

A test device and test method for sand-laden seawater erosion of valve ports, comprising a water pump, one end of which is connected to a water tank, and the other end of which is connected in series via a pipeline with a check valve, a filter and a sand mixing device. A circular ring structure is fixedly installed transversely on one end of the sand mixing device, and a P cavity is formed inside the sand mixing device. The device also comprises a conical cylinder, the large end of the conical cylinder is arranged in the P cavity, the small end of the conical cylinder extends into the circular ring structure, and a V cavity is formed inside the circular ring structure. A connecting rod is fixed to the outside of the large end of the conical cylinder, and the connecting rod passes through the sand mixing device and is connected to the output end of an electric cylinder. A hole is provided on the ring wall of the circular ring structure located in the V cavity area, and the hole is connected to a sand suspension tank via a pipeline. At the same time, the sand suspension tank is connected to the P cavity of the sand mixing device through a hard pipe. The end face of the circular ring structure facing away from the conical cylinder is connected to a concentration measuring tank, and the concentration measuring tank is connected to the valve to be tested. A laser particle size analyzer is provided at the bottom of the concentration measuring tank, and the operation is reliable and convenient.

Description

Technical Field

[0001] The invention relates to the technical field of deep sea test devices, in particular to a test device and a test method for sand-laden seawater erosion of a valve port. Background Art

[0002] There are a large number of suspended sand particles in seawater. The diameter and concentration of suspended sand vary greatly in different sea areas. When designing seawater hydraulic valves, in addition to considering the rated pressure and rated flow, it is also necessary to screen the valve port material to resist erosion by sandy seawater. In addition, after the valve is manufactured, the life of the valve port under the erosion condition of sandy seawater must be measured.

[0003] Erosion testing machines currently available mainly include tube flow, rotary, and jet types. The jet type mixes water and mortar at a nozzle and then sprays it onto the test piece. The rotary type places the test piece on a rotating disk and rotates it within the mixed mortar, generally only simulating laminar flow of the mixed mortar on the test piece's surface. The tube flow type generally uses a pump to spray the mixed mortar onto the test piece, as exemplified by the "Pipeline Erosion Corrosion Test System."

[0004] For seawater hydraulic valves, the diameter and concentration of suspended sediment in seawater passing through the valve port vary greatly in different sea areas. Therefore, an erosion test device is needed to adjust the diameter and concentration of suspended sediment during the test.

[0005] For seawater hydraulic valves, in actual use, the pressure difference between the inlet and outlet of the valve port is its rated working pressure, and the seawater flow rate through the valve port is its rated flow rate. Existing erosion testing machines all test specimens in an atmospheric environment and cannot accurately simulate the pressure and flow rate through the valve port. Therefore, the selection of valve port materials is not very accurate. Therefore, an erosion testing device is needed to operate the valve port at the rated pressure and rated flow rate during the erosion test.

[0006] After manufacturing, seawater hydraulic valves must undergo long-term testing at rated pressure, rated flow, and in sand-laden seawater of a certain concentration and diameter to accurately measure the valve port life. Therefore, an erosion test device is required, in which vulnerable components are isolated from the sand-laden seawater to ensure the reliability of the entire test device.

[0007] In summary, for seawater hydraulic valves, a test device for the erosion of valve ports by sandy seawater is required, which has the following functions: the diameter and concentration of suspended sand can be adjusted; the erosion test can be carried out at the rated pressure and flow of the valve port; and the vulnerable parts need to be isolated from the sandy seawater to ensure the reliability of the entire device. Summary of the Invention

[0008] In response to the shortcomings of the above-mentioned existing production technology, the applicant provides a test device and test method for sand-containing seawater erosion of valve ports, thereby effectively solving the problems that traditional erosion testing machines cannot solve. Erosion tests can be carried out reliably and long-term under rated pressure and flow, and the diameter and concentration of suspended sand can be easily adjusted.

[0009] The technical solutions adopted in the present invention are as follows:

[0010] A test device for erosion of valve ports by sand-laden seawater comprises a water pump, one end of the water pump being connected to a water tank, the other end of the water pump being connected in series with a check valve, a filter and a sand mixing device through a pipeline, and a safety valve being connected to the pipeline between the water pump and the check valve; a circular ring structure being fixedly installed transversely on one end of the sand mixing device, a P cavity being formed inside the sand mixing device, and a conical cylinder being further comprised, the large end of the conical cylinder being arranged in the P cavity, the small end of the conical cylinder extending into the circular ring structure to form a V cavity inside the circular ring structure, a connecting rod being fixed on the outside of the large end of the conical cylinder, the connecting rod passing through the sand mixing device and then connected to the output end of an electric cylinder, a hole being provided on the ring wall of the circular ring structure located in the V cavity area, the hole being connected to a sand suspension tank through a pipeline, and at the same time, the sand suspension tank being connected to the P cavity of the sand mixing device through a hard pipe, the end face of the circular ring structure facing away from the conical cylinder being connected to a concentration measurement tank, the concentration measurement tank being connected to the valve to be tested, and a laser particle size analyzer being provided at the bottom of the concentration measurement tank.

[0011] Its further technical solution is:

[0012] The sand mixing device is an internal pressure resistant container, and the working pressure of the sand mixing device is the same as the rated pressure of the valve to be tested.

[0013] The valve to be tested is a sequence valve, which is provided with a P port and an O port. The P port is connected to a concentration measuring tank, and the O port is connected to a manual pump.

[0014] The suspended sand tank is an internal pressure-resistant container, and the working pressure of the suspended sand tank is the same as the rated pressure of the valve to be tested.

[0015] A flexible film is provided inside the suspended sand tank, which divides the interior of the suspended sand tank into chamber A and chamber B. Chamber A is connected to chamber P inside the sand mixing device through a hard pipe, and chamber B is connected to the hole through a pipeline.

[0016] The A cavity and the B cavity are distributed vertically.

[0017] The concentration measuring tank is an internal pressure resistant container, and the working pressure of the concentration measuring tank is the same as the rated pressure of the valve to be tested.

[0018] The bottom of the concentration measuring tank is provided with transparent glass.

[0019] A test method for a test device for sand-laden seawater erosion of a valve port comprises the following steps:

[0020] S1: Preparation;

[0021] Prepare a ball mill, grind the sand to the required diameter in advance, and then add it into chamber B of the sand suspension tank;

[0022] S2: Installation work;

[0023] Connect the water inlet of the valve to be tested to the concentration measuring tank;

[0024] S3: deployment work;

[0025] Adjust the speed of the water pump so that the outlet flow of the water pump is the rated flow of the valve to be tested;

[0026] S4: Experiment starts;

[0027] The water at the pump outlet enters the P cavity through the check valve and filter, then enters the concentration measurement tank through the V cavity, and finally flows out through the valve port of the valve to be tested.

[0028] The beneficial effects of the present invention are as follows:

[0029] The present invention has a compact and reasonable structure and is easy to operate. By redesigning the entire test device and cooperating with each other, it is possible to conveniently carry out erosion tests at rated pressure and flow for a long time and reliably, and to achieve convenient adjustment of suspended sand diameter and concentration.

[0030] The present invention mixes water and sand before the test valve port, ensuring that precision components - water pumps and safety valves - do not contact sand-containing seawater, thereby ensuring that the entire device can operate the test valve port at rated pressure and flow for a long time; the present invention adopts a gap ring to change the flow velocity of the main line. According to the Bernoulli equation and the flow continuity equation, the internal pressure of the gap ring is lower than the pressure of the main line, so that suspended sand is sucked into the main line. The flow area of ​​the gap ring is adjusted by the electric cylinder, thereby adjusting the flow velocity inside the gap ring, thereby changing the pressure difference between the main line and the gap ring, and then adjusting the speed at which the suspended sand is sucked into the main line, thereby adjusting the suspended sand concentration. Since the electric cylinder responds quickly and has a wide operating frequency, the entire device can quickly adjust the suspended sand concentration in real time. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Figure 1 It is a structural schematic diagram of the present invention.

[0032] Figure 2 For the partial view of the present invention Figure 1 .

[0033] Figure 3 For the partial view of the present invention Figure 2 .

[0034] Figure 4 This is an application diagram of the present invention.

[0035] Including: 1. Water tank; 2. Water pump; 3. Safety valve; 4. Check valve; 5. Filter; 6. Sand mixing device; 7. Conical cylinder; 8. Connecting rod; 9. Electric cylinder; 10. Hard pipe; 11. Suspended sand tank; 12. Concentration measuring tank; 13. Laser particle size analyzer; 14. Test valve; 15. Sequence valve; 16. Manual pump

[0036] 602, ring structure; 603, hole;

[0037] 1101, flexible film;

[0038] 1201. Transparent glass. DETAILED DESCRIPTION

[0039] The specific embodiments of the present invention will be described below with reference to the accompanying drawings.

[0040] like Figures 1-4 As shown, the test device for sand-laden seawater erosion of valve ports in this embodiment includes a water pump 2, one end of which is connected to a water tank 1, and the other end of the water pump 2 is connected in series with a check valve 4, a filter 5 and a sand mixing device 6 through a pipeline, and a safety valve 3 is connected to the pipeline between the water pump 2 and the check valve 4; a circular ring structure 602 is fixedly installed at one end of the sand mixing device 6, and a P cavity is formed inside the sand mixing device 6, and further includes a tapered cylinder 7, the large end of the tapered cylinder 7 is arranged in the P cavity, and the small end of the tapered cylinder 7 extends into the circular ring structure 602 and is inside the circular ring structure 602. A V-cavity is formed in the interior, and a connecting rod 8 is fixed to the outside of the large end of the conical cylinder 7. The connecting rod 8 passes through the sand mixing device 6 and is connected to the output end of the electric cylinder 9. A hole 603 is provided on the ring wall of the circular ring structure 602 located in the V-cavity area. The hole 603 is connected to the sand suspension tank 11 through a pipeline. At the same time, the sand suspension tank 11 is connected to the P cavity of the sand mixing device 6 through a hard pipe 10. The end face of the circular ring structure 602 facing away from the conical cylinder 7 is connected to the concentration measuring tank 12. The concentration measuring tank 12 is connected to the valve to be tested 14. A laser particle size analyzer 13 is provided at the bottom of the concentration measuring tank 12.

[0041] The sand mixing device 6 is an internal pressure resistant container, and the working pressure of the sand mixing device 6 is the same as the rated pressure of the valve to be tested 14 .

[0042] The valve to be tested 14 is a sequence valve 15 , which is provided with a P port and an O port. The P port is connected to the concentration measuring tank 12 , and the O port is connected to the manual pump 16 .

[0043] The sand suspension tank 11 is an internal pressure-resistant container, and the working pressure of the sand suspension tank 11 is the same as the rated pressure of the valve to be tested 14 .

[0044] A flexible film 1101 is provided inside the sand suspension tank 11 , which divides the interior of the sand suspension tank 11 into chamber A and chamber B. Chamber A is connected to chamber P inside the sand mixing device 6 through a hard tube 10 , and chamber B is connected to the hole 603 through a pipeline.

[0045] Cavity A and cavity B are distributed up and down.

[0046] The concentration measuring tank 12 is an internal pressure-resistant container, and the working pressure of the concentration measuring tank 12 is the same as the rated pressure of the valve to be tested 14 .

[0047] The bottom of the concentration measurement tank 12 is provided with a transparent glass 1201 .

[0048] The test method of the test device for sand-laden seawater erosion of valve ports in this embodiment includes the following steps:

[0049] S1: Preparation;

[0050] Prepare a ball mill, grind the sand to the required diameter in advance, and then add it into the B cavity of the sand suspension tank 11;

[0051] S2: Installation work;

[0052] Connect the water inlet of the valve to be tested 14 to the concentration measuring tank 12;

[0053] S3: deployment work;

[0054] Adjust the speed of the water pump 2 so that the outlet flow of the water pump 2 is the rated flow of the valve to be tested 14;

[0055] S4: Experiment starts;

[0056] The water at the outlet of the water pump 2 enters the P cavity through the check valve 4 and the filter 5, then enters the concentration measuring tank 12 through the V cavity, and then flows out through the valve port of the valve to be tested 14.

[0057] An embodiment of a test device for sand-laden seawater erosion of valve ports according to the present invention is as follows:

[0058] It mainly includes a water tank 1, a water pump 2, a safety valve 3, a check valve 4, a filter 5, a sand mixing device 6, a conical cylinder 7, a connecting rod 8, an electric cylinder 9, a hard pipe 10, a sand suspension tank 11, a concentration measuring tank 12, a laser particle size analyzer 13, a sequence valve 15, and a manual pump 16.

[0059] The concentration measuring tank 12 is an internal pressure-resistant container, and its working pressure is the rated pressure of the sequence valve 15 . A transparent glass 1201 is provided on the tank to facilitate the laser particle size analyzer 13 to detect the suspended sediment concentration in the water.

[0060] The sand mixing device 6 is a pressure-resistant container, operating at the rated pressure of the sequence valve 15. It is equipped with a circular ring structure 602, which contains a chamber (P chamber) of a certain volume. The tapered cylinder 7 is a conical structure, with its large end located within the P chamber and its small end extending into the interior of the circular ring structure 602 (the conical chamber formed by the two is denoted as the V chamber). A connecting rod 8 passes through the wall of the sand mixing device 6 and is radially sealed against the wall. One end of the connecting rod is connected to the large end of the tapered cylinder 7 and the other end is connected to the electric cylinder 9. A hole 603 is provided on the wall of the circular ring structure 602 within the V chamber.

[0061] Among them, the sand suspension tank 11 is an internal pressure-resistant container, and its working pressure is the rated pressure of the sequence valve 15. A flexible film 1101 is provided inside the sand suspension tank 11, which divides the interior of the sand suspension tank 11 into chamber A and chamber B; chamber A is connected to chamber P inside the sand mixing device 6 through a hard pipe 10, and chamber B is connected to hole 603 through a pipeline.

[0062] Other connection relationships are as follows: the inlet and outlet of the water pump 2 are connected to the water tank 1, the water outlet is connected to the check valve 4 and the inlet of the safety valve 3, the outlet of the check valve 4 is connected to the P cavity of the sand mixing device 6 after passing through the filter 5, the other end of the ring structure 602 facing away from the conical cylinder 7 is connected to the concentration measuring tank 12, the P port of the sequence valve 15 is connected to the concentration measuring tank 12, and the O port is connected to the manual pump 16.

[0063] In this embodiment, the manual pump 16 is used to simulate ocean water pressure.

[0064] The working principle of the present invention is:

[0065] First: Use a ball mill to grind the sand to the required diameter in advance and add it into cavity B of the sand suspension tank 11;

[0066] Then: adjust the speed of water pump 2 so that its outlet flow rate reaches the rated flow rate of sequence valve 15;

[0067] Finally: the water at the outlet of the water pump 2 enters the P cavity through the check valve 4 and the filter 5, then enters the concentration measuring tank 12 through the V cavity, and then flows out through the valve port of the sequence valve 15.

[0068] The principle of suspended sand entering the V-cavity is as follows: select the cross-section at the connection between the P-cavity and the hard tube 10, where the pressure is P1 and the flow rate is V1; select the cross-section at the center of the hole 603 in the V-cavity, where the pressure is P2 and the flow rate is V2. According to the Bernoulli equation, P2 is less than P1, and the pressure difference between the two is mainly determined by the square difference between V1 and V2; since the pressure in the A-cavity is also P1, the suspended sand in the B-cavity is sucked into the V-cavity under the action of the pressure difference.

[0069] The principle of adjusting the suspended sediment concentration is as follows: the control system drives the electric cylinder 9 to extend or retract according to the suspended sediment concentration detected by the laser particle size analyzer 13, and then adjusts the degree to which the small end of the tapered cylinder 7 penetrates into the interior of the circular ring structure 602, thereby adjusting the flow area of ​​the cross section at the center of the hole 603. According to the flow continuity equation, the flow rate flowing through the two cross sections is the same, V1 remains unchanged, and V2 changes inversely with the change of the cross-sectional flow area at the center of the hole 603, thereby adjusting the value of P2, thereby adjusting the speed at which the suspended sediment in the B cavity is sucked into the V cavity. This closed-loop control can ensure that the suspended sediment concentration in the concentration measuring tank 12 is controlled at the desired value.

[0070] The filter 5 described in the present invention uses a precision filter, which can ensure that the water medium in the water pump 2 and the safety valve 3 does not contain suspended sand, thereby ensuring the long-term operational reliability of both. When the water pump 2 is selected, its rated pressure is the same as the rated pressure of the sequence valve 15, ensuring that the sequence valve 15 under test can be subjected to erosion tests under the rated flow rate and rated pressure for a long time in sand-laden seawater of the desired concentration and diameter, so as to accurately simulate its actual working conditions, accurately screen out valve seat and valve ball materials with excellent performance, and accurately measure the valve port life.

[0071] The above description is an explanation of the present invention, not a limitation of the present invention. The scope of the present invention is defined in the claims. Any modifications may be made within the scope of protection of the present invention.

Claims

1. A test device for valve port erosion by sandy seawater, characterized by: The invention comprises a water pump (2), one end of the water pump (2) is connected to a water tank (1), the other end of the water pump (2) is connected in series with a check valve (4), a filter (5) and a sand mixing device (6) through a pipeline, and a safety valve (3) is connected to the pipeline between the water pump (2) and the check valve (4); a circular ring structure (602) is fixedly installed on one end of the sand mixing device (6) in a transverse direction, and a P cavity is formed inside the sand mixing device (6), and the water pump (2) further comprises a tapered cylinder (7), the large end of the tapered cylinder (7) is arranged in the P cavity, and the small end of the tapered cylinder (7) extends into the circular ring structure (602) to form a V cavity inside the circular ring structure (602), and the tapered cylinder ( A connecting rod (8) is fixed to the outside of the large end of the sand mixing device (7), and the connecting rod (8) passes through the sand mixing device (6) and is connected to the output end of the electric cylinder (9). A hole (603) is provided on the ring wall of the ring structure (602) located in the V cavity area, and the hole (603) is connected to the sand suspension tank (11) through a pipeline. At the same time, the sand suspension tank (11) is connected to the P cavity of the sand mixing device (6) through a hard pipe (10). The end face of the ring structure (602) facing away from the conical cylinder (7) is connected to the concentration measurement tank (12), and the concentration measurement tank (12) is connected to the valve to be tested (14). A laser particle size analyzer (13) is provided at the bottom of the concentration measurement tank (12).

2. The test device for valve port erosion caused by sandy seawater according to claim 1, characterized in that: The sand mixing device (6) is an internal pressure resistant container, and the working pressure of the sand mixing device (6) is the same as the rated pressure of the valve to be tested (14).

3. The device for testing valve ports eroded by sandy seawater according to claim 1, characterized in that: The valve to be tested (14) is a sequence valve (15), and the sequence valve (15) is provided with a P port and an O port, wherein the P port is connected to the concentration measuring tank (12), and the O port is connected to the manual pump (16).

4. The test device for valve port erosion caused by sandy seawater according to claim 1, characterized in that: The sand suspension tank (11) is an internal pressure-resistant container, and the working pressure of the sand suspension tank (11) is the same as the rated pressure of the valve to be tested (14).

5. The test device for valve port erosion caused by sandy seawater according to claim 1, characterized in that: A flexible film (1101) is provided inside the sand suspension tank (11), and the flexible film (1101) divides the interior of the sand suspension tank (11) into chamber A and chamber B. Chamber A is connected to chamber P inside the sand mixing device (6) through a hard tube (10), and chamber B is connected to the hole (603) through a pipeline.

6. The test device for valve port erosion caused by sandy seawater according to claim 5, characterized in that: The A cavity and the B cavity are distributed vertically.

7. The device for testing valve ports eroded by sandy seawater according to claim 1, characterized in that: The concentration measuring tank (12) is an internal pressure-resistant container, and the working pressure of the concentration measuring tank (12) is the same as the rated pressure of the valve to be tested (14).

8. The device for testing valve ports eroded by sandy seawater according to claim 1, characterized in that: The bottom of the concentration measuring tank (12) is provided with transparent glass (1201).

9. A test method for the sand-laden seawater erosion valve port test device according to claim 1, characterized in that: The steps are as follows: S1: Preparation; Prepare a ball mill, grind the sand to the required diameter in advance, and then add it into the B cavity of the sand suspension tank (11); S2: Installation work; Connect the water inlet of the valve to be tested (14) to the concentration measuring tank (12); S3: deployment work; Adjusting the rotation speed of the water pump (2) so that the outlet flow rate of the water pump (2) is the rated flow rate of the valve to be tested (14); S4: Experiment starts; The water at the outlet of the water pump (2) enters the P cavity through the check valve (4) and the filter (5), then enters the concentration measurement tank (12) through the V cavity, and then flows out through the valve port of the test valve (14).

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