Testing device and testing method for valve port eroded by sand-containing seawater

Abstract

The test device comprises a water pump, one end of the water pump is connected with a water tank, the other end of the water pump is sequentially connected with a check valve, a filter and a sand mixing device in series through a pipeline, a circular ring structure is transversely and fixedly installed at one end of the sand mixing device, and a P cavity is formed in the sand mixing device. 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, a V cavity is formed in the circular ring structure, a connecting rod is fixed outside the large end of the conical cylinder, the connecting rod penetrates through the sand mixing device and then is connected with the output end of the electric cylinder, and a hole is formed in the ring wall of the circular ring structure located in the V cavity area. The hole is connected with a suspended sand tank through a pipeline, the suspended sand tank is communicated with a P cavity of the sand mixing device through a hard pipe, the end face, deviating from the conical cylinder, of the circular ring structure is connected to a concentration measuring tank, the concentration measuring tank is communicated with a valve to be tested, and a laser particle analyzer is arranged at the bottom of the concentration measuring tank.

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-containing seawater erosion of a valve port. Background Art

[0002] There are a large number of suspended sand particles in seawater. In different sea areas, the diameter and concentration of suspended sand vary greatly. 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 the erosion of the valve port by sandy seawater. In addition, after the valve is manufactured, it is also necessary to measure the life of the valve port under the erosion condition of sandy seawater.

[0003] Erosion test machines in the prior art mainly include pipe flow type, rotary type and jet type. The jet type is to mix water and mortar at the nozzle and then spray it onto the test piece; the rotary type is to place the test piece on a rotating disk and rotate it in the mixed mortar, which can generally only simulate the laminar flow of the mixed mortar on the surface of the test piece; the pipe flow type generally uses a pump to spray the mixed mortar onto the test piece, such as "A Pipeline Erosion Corrosion Experiment System".

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

[0005] For seawater hydraulic valves, in actual use, the inlet and outlet pressure difference of the valve port is its rated working pressure, and the seawater flow rate through the valve port is its rated flow rate. The existing erosion testers test the specimens in the 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 test device is needed. When performing the erosion test, the valve port works at the rated pressure and rated flow rate.

[0006] For seawater hydraulic valves, after manufacturing, long-term tests must be carried out at rated pressure, rated flow, and in sandy seawater of a certain concentration and diameter to accurately measure the valve port life. Therefore, an erosion test device is required, whose vulnerable parts are isolated from the sandy 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 needed, 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 rate 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 view of the shortcomings in the above-mentioned existing production technology, the applicant provides a test device and a 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 for a long time under rated pressure and flow, and the diameter and concentration of suspended sand can be easily adjusted.

[0009] The technical solution adopted by the present invention is as follows:

[0010] A test device for sand-containing seawater erosion of valve ports comprises a water pump, one end of the water pump is connected to a water tank, the other end of the water pump is connected in series with a check valve, a filter and a sand mixing device in sequence through a pipeline, and a safety valve is connected to the pipeline between the water pump and the check valve; a circular ring structure is fixedly installed transversely on one end of the sand mixing device, a P cavity is formed inside the sand mixing device, and a conical cylinder is also included, 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 outside the large end of the conical cylinder, the connecting rod passes through the sand mixing device and then connects to the output end of an electric cylinder, a hole is arranged on the ring wall of the circular ring structure located in the V cavity area, the hole is connected to a sand suspension tank through a pipeline, and 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 away from the conical cylinder is connected to a concentration measurement tank, the concentration measurement tank is connected to a valve to be tested, and a laser particle size analyzer is arranged 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 arranged inside the suspended sand tank, and the flexible film divides the inside 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 erosion of a valve port by sand-containing seawater 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: start of the experiment;

[0027] The water at the pump outlet enters the P chamber through the check valve and filter, then enters the concentration measurement tank through the V chamber, and then 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, the erosion test can be easily and reliably carried out under rated pressure and flow rate for a long time, and the diameter and concentration of suspended sand can be conveniently adjusted.

[0030] The present invention mixes water and sand before the tested valve port, thereby ensuring that the precision components, i.e., the water pump and the safety valve, do not contact the sandy seawater, thereby ensuring that the whole device can operate the tested valve port at the rated pressure and flow rate for a long time; the present invention adopts a gap ring to change the flow rate of the main pipeline, and 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 pipeline, so that the suspended sand is sucked into the main pipeline, and the flow area of ​​the gap ring is adjusted by the electric cylinder, thereby adjusting the flow rate in the gap ring, thereby changing the pressure difference between the main pipeline and the gap ring, and then adjusting the speed at which the suspended sand is sucked into the main pipeline, thereby adjusting the suspended sand concentration, and because the electric cylinder responds quickly and has a wide operating frequency, the whole device can quickly and in real time adjust the suspended sand concentration. 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] Among them: 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 implementation of the present invention will be described below in conjunction with the accompanying drawings.

[0040] like Figure 1-Figure 4 As shown, the test device for the erosion of valve ports by sand-containing seawater of the present embodiment 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 transversely fixedly installed at one end of the sand mixing device 6, a P cavity is formed inside the sand mixing device 6, and the sand mixing device 6 also comprises a conical cylinder 7, the large end of the conical cylinder 7 is arranged in the P cavity, the small end of the conical cylinder 7 extends into the circular ring structure 602, and is inside the circular ring structure 602. A V-cavity is formed in the part, a connecting rod 8 is fixed to the outside of the large end of the conical cylinder 7, and the connecting rod 8 is connected to the output end of the electric cylinder 9 after passing through the sand mixing device 6. A hole 603 is arranged on the ring wall of the circular 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 circular ring structure 602 facing away from the conical cylinder 7 is connected to the concentration measuring tank 12, and the concentration measuring tank 12 is connected to the valve to be tested 14. A laser particle size analyzer 13 is arranged 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 14 to be tested.

[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 , and the flexible film 1101 divides the inside of the sand suspension tank 11 into a cavity A and a cavity B. Cavity A is connected to cavity P inside the sand mixing device 6 through a hard tube 10 , and cavity B is connected to the hole 603 through a pipeline.

[0045] The A cavity and the B cavity 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 14 to be tested.

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

[0048] The test method of the test device for the sand-containing seawater erosion of valve ports of 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 rotation speed of the water pump 2 so that the outlet flow of the water pump 2 is the rated flow of the valve 14 to be tested;

[0055] S4: start of the experiment;

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

[0057] An embodiment of a test device for sand-containing 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, the working pressure of which is the rated pressure of the sequence valve 15, and a transparent glass 1201 is provided on it to facilitate the laser particle size analyzer 13 to detect the suspended sand concentration in the water.

[0060] The sand mixing device 6 is an internal pressure resistant container, and its working pressure is the rated pressure of the sequence valve 15. The sand mixing device 6 is provided with a circular ring structure 602, and there is a certain volume of a cavity (P cavity) inside the sand mixing device 6. The conical cylinder 7 is a conical structure, and its large end is in the P cavity, and the small end extends into the interior of the circular ring structure 602 (the conical cavity formed by the two is recorded as a V cavity); the connecting rod 8 passes through the wall of the sand mixing device 6 and is radially sealed with the wall, one end of which is connected to the large end of the conical cylinder 7, and the other end is connected to the electric cylinder 9; a hole 603 is provided on the ring wall of the circular ring structure 602 in the V cavity area.

[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 arranged 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 annular structure 602 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 the ocean water depth 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 the B cavity of the sand suspension tank 11;

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

[0067] Finally: the water at the outlet of the water pump 2 enters the P chamber through the check valve 4 and the filter 5, then enters the concentration measuring tank 12 through the V chamber, 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, the pressure of which is P1 and the flow rate is V1; select the cross-section at the center of the hole 603 in the V-cavity, the pressure of which 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 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 rates flowing through the two cross sections are 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 measurement 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 reliability of the long-term operation 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 tested sequence valve 15 can be subjected to erosion tests under sandy seawater of expected concentration and diameter, at rated flow and rated pressure for a long time, 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 form of modification 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 in that: 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 transversely on one end of the sand mixing device (6), a P cavity is formed inside the sand mixing device (6), and a conical cylinder (7) is also included, the large end of the conical cylinder (7) is arranged in the P cavity, the small end of the conical cylinder (7) extends into the circular ring structure (602), and a V cavity is formed inside the circular ring structure (602), and the conical 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 arranged 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 surface 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 arranged at the bottom of the concentration measurement tank (12).

2. A test device for valve port erosion by sandy seawater as claimed in 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 (14) to be tested.

3. A test device for valve port erosion by sandy seawater as claimed in 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, the P port is connected to a concentration measuring tank (12), and the O port is connected to a manual pump (16).

4. A test device for valve port erosion by sandy seawater as claimed in 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 (14) to be tested.

5. The test device for valve port erosion by sandy seawater according to claim 1, characterized in that: A flexible film (1101) is arranged 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. A test device for valve port erosion by sandy seawater as claimed in claim 5, characterized in that: The A cavity and the B cavity are distributed vertically.

7. A test device for valve port erosion by sandy seawater as claimed in 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 (14) to be tested.

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

9. A test method for the test device for erosion of valve ports by sandy seawater as claimed in 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 chamber of the sand suspension tank (11); S2: Installation work; Connecting 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 equal to the rated flow rate of the valve (14) to be tested; S4: start of the experiment; The water at the outlet of the water pump (2) enters the P chamber through the check valve (4) and the filter (5), then enters the concentration measurement tank (12) through the V chamber, and then flows out through the valve port of the valve to be tested (14).

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