CN102288384A - Large-scale unsteady flow decompression box - Google Patents

Abstract

The invention belongs to the field of hydraulic test equipment, and is a large-scale non-constant flow decompression box for a laboratory, including an upstream reservoir box, a downstream reservoir box, a test section and a computer, and also includes a gas collection tank, a vacuum pump, a reservoir suction pipe and The suction pipe of the test section, the gas collection tank is connected to the vacuum pump, the reservoir suction pipe and the test section suction pipe are connected to the gas collection tank; the reservoir suction pipe is connected to the upstream reservoir tank and the downstream reservoir tank, and the downstream suction branch pipe is equipped with a downstream reservoir Exhaust pipe gate valve; the exhaust pipe of the test working section is connected to the test working section, on which there is a gate valve for the exhaust pipe of the test working section; the downstream reservoir tank is provided with a downstream reservoir inlet pipe, and the downstream reservoir inlet pipe is provided with a downstream reservoir inlet valve. The invention is easy to operate, does not need to install a water pump in the return water pipeline, can provide large flow and unsteady flow, and can solve the technical problems of cavitation damage of the water pump in the decompression experiment and cannot simulate the continuous process of the unsteady flow of the prototype; The pressure box adjusts the water pump of the upstream and downstream water flow, which saves civil engineering workload and investment; simplifies the test process, saves water and electricity costs and test time.

Description

Large non-constant flow decompression box

technical field

The invention belongs to the field of hydraulic test equipment, and relates to a decompression box, in particular to a large unsteady flow decompression box for a laboratory.

Background technique

At present, in the hydraulic laboratory, the common decompression box is composed of the test section, the vacuum system, and the water supply and return pipeline (the water pump system must be installed). During the test, the opening and closing equipment can only be fixed, which is inconvenient to adjust. Generally only constant flow decompression tests can be carried out. There are differences between the test simulation and the unsteady flow continuous process of the prototype, especially the water pump system installed in the water supply and return pipeline, in order to avoid cavitation damage, it must be buried 10 meters below the test working section, which increases the workload and difficulty of civil engineering. Therefore need a kind of unsteady flow decompression box that is easy to operate, does not set up water pump in the return water pipeline, can provide large flow.

Contents of the invention

The technical problem to be solved by the present invention is: Aiming at the shortcomings of the above prior art, a large non-constant flow decompression tank is proposed, which is easy to operate, does not need to install a water pump in the return water pipeline, can provide large flow and non-constant flow, and can solve the problem of In the decompression experiment, the cavitation damage of the water pump and the unsteady flow continuous process of the prototype cannot be simulated.

The technical scheme that the present invention solves above technical problem is:

A large unsteady flow decompression tank, including an upstream reservoir tank, a downstream reservoir tank, a test section and a computer, a model is arranged in the test section, the upstream reservoir box and the downstream reservoir box are connected through a return pipe, and the upstream The reservoir tank is connected to the model of the test working section through the water inlet pipe, and the model of the test working section is connected to the downstream reservoir tank through the water outlet pipe. The return pipe gate valve; the connection between the model and the water inlet pipe is equipped with a model control valve, and the model control valve is connected with a hydraulic opening and closing system to control its continuous opening, an upstream water level sensor is installed in the upstream reservoir tank, and a downstream water level sensor is installed in the downstream reservoir tank. The upstream water level sensor, downstream water level gauge and hydraulic opening and closing system are connected to the computer; it also includes the gas collection tank, vacuum pump, reservoir suction pipe and test section suction pipe, the gas collection tank is connected to the vacuum pump, the reservoir suction pipe is connected to the test work section The air extraction pipes are all connected to the gas collection tank; the reservoir air extraction pipes are connected to the upstream reservoir tank and the downstream reservoir tank, and there are upstream and downstream reservoir air pressure communication gate valves on it (reservoir air extraction pipe), and the upstream and downstream reservoir air pressure communication gate valves are connected to the upstream reservoir tank The connected reservoir air extraction pipe is connected to the gas collection tank through the upstream air extraction branch pipe. The upstream air extraction pipe gate valve is installed on the upstream air extraction branch pipe. The gas branch pipe is connected to the gas collection tank, and the downstream gas extraction branch pipe is provided with a gate valve of the downstream reservoir gas extraction pipe; the gas extraction pipe of the test working section is connected to the test working section, and (the gas extraction pipe of the test working section) is provided with a gate valve of the gas extraction pipe of the test working section The downstream reservoir box is provided with a downstream reservoir inlet pipe, and the downstream reservoir inlet pipe is provided with a downstream reservoir inlet valve.

In this way, the upstream and downstream water levels of the non-constant flow decompression tank are set in the computer. When the air pressure in the decompression tank reaches the vacuum degree required for the test, the computer sets the stroke of the hydraulic rod, sends a signal to the hydraulic opening and closing system, and the hydraulic opening and closing After receiving the signal, the system drives the hydraulic rod to move, and runs according to the stroke set by the computer; the control valve of the model in the test section is opened, and the water flows through the upstream reservoir, the water inlet pipe, the test section, and the downstream reservoir through the outlet pipe. When the water level of the downstream reservoir is equal, the unsteady flow test process is over; through the upstream and downstream reservoir air pressure connection gate valve, the downstream reservoir suction pipe gate valve, the test working section suction pipe gate valve, the upstream reservoir suction pipe gate valve, the downstream reservoir intake gate valve and the model. The gate valve on the water pipeline is linked, and the air pressure difference between the downstream reservoir and the upstream reservoir is used to realize the scheduling of the water flow from the downstream reservoir to the upstream reservoir; when the upstream and downstream water levels and vacuum degrees reach the required values for the test, the next test process begins, and so on. Realize the function of unsteady flow decompression test.

The technical scheme further defined in the present invention is:

The aforementioned large-scale non-constant flow decompression tank, the upstream reservoir tank and the downstream reservoir tank include at least two water distribution tanks, and an internal communication valve for regulating the reservoir and an internal regulating water pump for regulating the reservoir are arranged between adjacent water distribution tanks. The air pipe is directly connected or connected to the reservoir suction pipe through a branch pipe. In this way, the upstream reservoir and the downstream reservoir can achieve the purpose of fine-tuning the water level through the intercommunicating valve inside the reservoir and regulating the water pump.

The advantages of the present invention are: the present invention adjusts the water flow through the setting of various pipelines and valves, and can simulate the unsteady flow process in the laboratory, and the operation is simple; The water pump for adjusting the upstream and downstream water flow saves civil engineering workload and investment; during the test, the upstream reservoir and the downstream reservoir can achieve the purpose of fine-tuning the water level through the internal connection valve of the reservoir and adjusting the water pump, which simplifies the test process and saves water and electricity costs and tests. Time; the invention is easy to operate, does not need to install a water pump in the return water pipeline, can provide large flow and unsteady flow, and can solve the technical problems of cavitation damage of the water pump in the decompression experiment and the inability to simulate the continuous process of the unsteady flow of the prototype.

Description of drawings

Fig. 1 is a schematic elevation view of the present invention.

Figure 2 is a schematic plan view of the present invention.

Detailed ways

Example 1

This embodiment is a large-scale non-constant flow decompression box, connected as shown in Figure 1 and Figure 2, including an upstream reservoir box 1, a downstream reservoir box 2, a test section 3 and a computer, and a model is provided in the test section 3 23. The upstream reservoir tank 1 and the downstream reservoir tank 2 are connected through the return pipe 6, the upstream reservoir tank 1 is connected to the model 23 of the test section 3 through the water inlet pipe 4, and the model 23 of the test section 3 is connected to the downstream reservoir through the outlet pipe 5 Box 2, water inlet pipe 4 is provided with inlet pipe gate valve 11, outlet pipe 5 is provided with outlet pipe gate valve 12, and return pipe 6 is provided with return pipe gate valve 13; the connection between model 23 and water inlet pipe 4 is provided with a model control valve 24. The model control valve 24 is connected with a hydraulic opening and closing system 22 that controls its continuous opening. The upstream water level sensor 25 is provided in the upstream reservoir tank 1. The downstream water level gauge 26 is provided in the downstream reservoir tank 2. The upstream water level sensor 25 and the downstream water level Meter 26 and hydraulic opening and closing system 22 are connected with computer. It also includes gas collection tank 9, vacuum pump 10, reservoir air extraction pipe 7 and test section air extraction pipe 8, air collection tank 9 is connected with vacuum pump 10, gate valve 18 is arranged on the connecting pipeline, reservoir air extraction pipe 7 and test work section air extraction pipe 8 All are connected with gas collecting tank 9. Reservoir air extraction pipe 7 is connected to upstream reservoir tank 1 and downstream reservoir tank 2, and upstream and downstream reservoir air pressure communication gate valve 14 is arranged on it. The air extraction branch pipe 28 is connected to the gas collection tank 9, and the upstream air extraction branch pipe 28 is provided with an upstream reservoir air extraction pipe gate valve 17, and the reservoir air extraction pipe 7 connected to the downstream reservoir tank 2 on the side of the upstream and downstream reservoir air pressure communication gate valve 14 passes through the downstream pumping pipe. The gas branch pipe 29 is connected to the gas collection tank 9, and the downstream air extraction branch pipe 29 is provided with a gate valve 15 of the downstream reservoir air extraction pipe. The test section air extraction pipe 8 is connected to the test work section 3, on which a test section air extraction pipe gate valve 16 is provided; the downstream reservoir box 2 is provided with a downstream reservoir air intake pipe, and the downstream reservoir air intake pipe is provided with a downstream reservoir air intake valve 19. The upstream reservoir box 1 is made up of two sub-reservoir boxes, and the internal communication valve 20 of the regulating reservoir and the internal regulating water pump 21 of the reservoir are arranged between the two sub-reservoir boxes. The downstream reservoir box 2 is made up of four sub-reservoir boxes, and the internal communication valve 20 of the regulating reservoir and the regulating water pump 21 inside the reservoir are arranged between the adjacent sub-reservoir boxes.

The working process of this embodiment is as follows:

(1) Set the water level of the upstream and downstream reservoirs of the unsteady flow decompression box in the computer;

(2) Start the vacuum pump 10, open the suction pipe gate valve 18, open the upstream and downstream reservoir air pressure communication gate valve 14, the downstream reservoir suction pipe gate valve 15, the test section suction pipe gate valve 16 and the upstream reservoir suction pipe gate valve 17, when the air pressure in the decompression box reaches the test When the vacuum degree is required, the computer controls the hydraulic opening and closing system 22, and sends a signal to the hydraulic opening and closing system 22, and the hydraulic opening and closing system 22 controls the model control valve 24 after receiving the signal;

(3) The hydraulic opening and closing system 22 drives the model control valve 24, and the water flows from the upstream reservoir tank 1, through the water inlet pipe 4, the test section 3, and the outlet pipe 5 enters the downstream reservoir 2. When the water levels of the upstream and downstream reservoirs are equal, this non- The constant flow test process is over;

(iv) Close the air pressure connecting gate valve 14 of the upstream and downstream reservoirs, the suction pipe gate valve 15 of the downstream reservoir, and the suction pipe gate valve 16 of the test section, close the water inlet pipe gate valve 11 and the water outlet pipe gate valve 12, open the return pipe gate valve 13, and open the lower reservoir air intake valve 19, The air pressure on the water surface of the downstream reservoir gradually rises. At this time, the upstream reservoir continues to evacuate, and the water surface air pressure continues to drop, that is, the vacuum degree is still rising. The water pipeline flows to the upstream reservoir to realize the scheduling of the water flow from the downstream reservoir to the upstream reservoir;

(5) During the test, the upstream reservoir and the downstream reservoir can achieve the purpose of fine-tuning the water level through the internal communication valve 20 and the regulating pump 21 of the reservoir;

(vi) When the water level of the upstream and downstream reservoirs reaches the water level required for the test, close the inlet valve 19 of the downstream reservoir, open the air pressure connecting gate valve 14 of the upstream and downstream reservoirs, the gate valve 15 of the suction pipe of the downstream reservoir and the gate valve 16 of the suction pipe of the test working section, and open the gate valve of the inlet and outlet water pipes of the model 11, 12. The vacuum pump continues to pump air to the decompression box system. When the air pressure in the decompression box reaches the vacuum degree required for the test, the next test process starts. This reciprocation realizes the non-constant flow decompression test function.

The present invention can also have other implementation modes, and all technical solutions formed by equivalent replacement or equivalent transformation fall within the protection scope of the present invention.

Claims (2)

1. large-scale unsteady flow decompression cabinet, comprise upper pond case (1), lower reservoir case (2), experiment work section (3) and computing machine, be provided with model (23) in the described experiment work section (3), described upper pond case (1) and lower reservoir case (2) are by return pipe (6) UNICOM, described upper pond case (1) connects the model (23) of described experiment work section (3) by water inlet pipe (4), the model (23) of described experiment work section (3) connects lower reservoir case (2) by rising pipe (5), described water inlet pipe (4) is provided with water inlet pipe gate valve (11), described rising pipe (5) is provided with rising pipe gate valve (12), and (6) are provided with return pipe gate valve (13) on the described return pipe; Described model (23) is provided with model by-pass valve control (24) with the junction of water inlet pipe (4), described model by-pass valve control (24) is connected with its hydraulic pressure opening/closing system (22) of opening continuously of control, be provided with upper pond level sensor (25) in the described upper pond case (1), be provided with level of tail water meter (26) in the described lower reservoir case (2), described upper pond level sensor (25), level of tail water meter (26) and hydraulic pressure opening/closing system (22) are connected with computing machine; It is characterized in that: also comprise air collector (9), vacuum pump (10), reservoir exhaust tube (7) and experiment work section exhaust tube (8), described air collector (9) is connected with vacuum pump (10), and described reservoir exhaust tube (7) all is connected with air collector (9) with experiment work section exhaust tube (8); Described reservoir exhaust tube (7) connects upper pond case (1) and lower reservoir case (2), which is provided with upstream and downstream reservoir air pressure UNICOM's gate valve (14), the reservoir exhaust tube (7) that is connected with described upper pond case (1) of described upstream and downstream reservoir air pressure UNICOM gate valve (14) one sides is connected to described air collector (9) by upstream suction branch (28), described upstream suction branch (28) is provided with upper pond exhaust tube gate valve (17), the reservoir exhaust tube (7) that is connected with described lower reservoir case (2) of described upstream and downstream reservoir air pressure UNICOM gate valve (14) one sides is connected to described air collector (9) by downstream suction branch (29), and described downstream suction branch (29) is provided with lower reservoir exhaust tube gate valve (15); Described experiment work section exhaust tube (8) connects experiment work section (3), which is provided with experiment work section exhaust tube gate valve (16); Have the lower reservoir draft tube on the described lower reservoir case (2), described lower reservoir draft tube is provided with lower reservoir gas admittance valve (19).

2. large-scale unsteady flow decompression cabinet as claimed in claim 1, it is characterized in that: described upper pond case (1) and lower reservoir case (2) all comprise two diversion boxs at least, be provided with inner coupling cock (20) of balancing reservoir and reservoir internal regulation water pump (21) between the described adjacent diversion box, described each diversion box directly is connected with reservoir exhaust tube (7) or is connected to reservoir exhaust tube (7) by arm.

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