A zone cooling system simulation test device and test method

Abstract

The application provides a regional cooling system simulation test device and a test method, similarity of hydraulic characteristics is adopted to construct a scale test device, a real cooling system is replaced to carry out control strategy simulation test, steady-state flow distribution test of multiple users and dynamic flow balance test of multiple working conditions are simulated, static pressure loss or pipeline resistance loss along the way is simulated by adopting a serpentine pipe, real local throttle loss of cooling equipment is simulated by adopting a throttle orifice plate, scale and cost of the test device are reduced, the regional cooling system is simulated, the test device occupies small space, valves and sensors are arranged to facilitate operation and inspection, the test device is simple to build and install, a debugging period is short, and the test device tests an optimal control strategy of an automatic regulating valve.

Description

Technical Field

[0001] This invention relates to the field of shipbuilding and marine engineering manufacturing technology, specifically to a regional cooling system simulation test device and test method. Background Technology

[0002] Large marine transport platforms such as engineering vessels, marine engineering projects, luxury cruise ships, and military ships are equipped with numerous and diverse pieces of equipment that require seawater cooling to ensure normal operation. These devices are widely distributed across the ship, with significant differences in the required cooling water volume and supply pressure, and operate under various conditions.

[0003] There are two common design schemes for ship cooling systems: one is independent cooling for individual equipment; the other is to divide the ship's cooling equipment into zones, with centralized cooling for equipment in local areas. Independent cooling schemes are simpler and have fewer technical problems, but they result in a large number and variety of cooling water pumps throughout the ship, increasing the number of systems and management workload. In contrast, zone cooling schemes reduce the number of seawater cooling systems and overcome the disadvantages of independent cooling schemes.

[0004] Currently, most zone cooling systems use manually controlled valves. During system commissioning, manual valve adjustment has drawbacks such as being time-consuming, increasing difficulty with a larger number of devices, and becoming more complex with increasing system complexity. If many devices in the zone cooling system operate under different conditions simultaneously, the system balance needs to be manually adjusted again when the operating conditions change. Manual adjustment is time-consuming, labor-intensive, and difficult. Summary of the Invention

[0005] To test the control strategy, all equipment requiring cooling in the regional cooling system was brought together for joint debugging tests. Therefore, the technical problem that this invention needs to solve is:

[0006] 1. The flow characteristics of each branch are highly coupled with the opening of the regulating valve, so that a change in one affects the whole system;

[0007] 2. At the same time, there is a certain lag in the flow response. After the valve opening is adjusted to the correct position, the flow rate needs a certain amount of time to respond and stabilize.

[0008] 3. The equipment being cooled is large in size, making it inconvenient to move and install;

[0009] 4. The large number of cooling devices, arranged on multiple decks on the actual ship, places high demands on the joint commissioning and testing site;

[0010] 5. The valves and sensors in the test system are widely distributed, making them difficult to operate and read data.

[0011] 6. The setup and debugging cycle of the joint testing system is long.

[0012] To address the aforementioned technical problems, the present invention provides a regional cooling system simulation test apparatus, comprising:

[0013] One end of the centrifugal pump discharge pipe, one end of the bypass branch, one end of the first cooling branch, one end of the second cooling branch, and one end of the third cooling branch are all connected to the water tank. The other end of the centrifugal pump discharge pipe is connected to the other end of the bypass branch and one end of the main pipe, respectively. The other end of the main pipe is connected to the other end of the first cooling branch, the other end of the second cooling branch, and the other end of the third cooling branch, respectively.

[0014] The first, second, and third cooling branches are all equipped with static balancing valves, flow meters, and remote-controlled flow regulating valves.

[0015] The first cooling branch, the second cooling branch, and the third cooling branch are each connected to the same number of sub-branches as the equipment being cooled. Each sub-branch is equipped with a static balancing valve, a pressure sensor, and a flow meter.

[0016] The main pipeline is equipped with a flow meter;

[0017] The bypass branch is equipped with a flow meter, a remote-controlled flow regulating valve, and a pressure sensor;

[0018] A centrifugal pump is installed in the centrifugal pump discharge line;

[0019] The centrifugal pump discharge pipe draws cooling water from the water tank at one end, which flows into the main pipeline and the bypass branch. The cooling water flowing into the bypass branch returns to the water tank, and the cooling water flowing into the main pipeline returns to the water tank through the first cooling branch, the second cooling branch, the third cooling branch, and the corresponding sub-branch.

[0020] The control console controls the activation of static balancing valves, remote flow regulating valves, and centrifugal pumps to control the corresponding pipeline flow. Based on the data collected from flow meters and pressure sensors, it compares whether the corresponding pipelines have reached the user's preset values. It also constructs scaled-down tests using the similarity of hydraulic characteristics to simulate steady-state flow distribution tests of multiple cooling devices and dynamic flow balance tests under multiple operating conditions. Based on the cycle and step size of the remote flow regulating valves and the time taken for the flow meters and pressure sensors to reach the user's preset values ​​during the test, it formulates the optimal valve control strategy.

[0021] Preferably, the main pipeline is further provided with a serpentine pipe, the number of which is determined by calculating the resistance data of the serpentine pipe based on the simulated pipeline friction loss characteristics, in order to simulate static pressure loss or pipeline friction loss.

[0022] Preferably, the sub-branch is further provided with a throttling orifice plate, the opening size of which is determined according to the simulated local resistance loss characteristics of the cooled equipment, so as to simulate the real local throttling loss of the cooling equipment.

[0023] Preferably, the parameters of the centrifugal pump and the pipe diameter of the centrifugal pump discharge pipe are determined by a scaled-down test based on the principle of similarity of hydraulic characteristics.

[0024] Preferably, each of the sub-branch, the first cooling branch, the second cooling branch, the third cooling branch, the bypass branch, and the centrifugal pump discharge pipeline is equipped with a shut-off check valve for unidirectional flow of cooling water.

[0025] Preferably, the static balancing valve is a flange-type static balancing valve. Before installation, it is pre-adjusted using professional equipment according to the flow rate and pressure difference requirements of the first, second, and third cooling branches to ensure that the pressure on both sides of the flange-type static balancing valve is relatively balanced.

[0026] Preferably, the control console includes a computer, a PLC controller, and a switching power supply, and has three input interfaces: AC380V, AC220V, and DC24V, to reduce interference between input currents and ensure the accuracy of test data.

[0027] Preferably, the console further includes a human-machine interface for acquiring user-inputted preset values ​​and displaying data from the pressure sensor and flow meter, the motor operating status of the centrifugal pump, the opening and closing status of the static balancing valve, and the opening and closing status of the remote-controlled flow regulating valve.

[0028] The present invention also provides a method for simulating a regional cooling system, which uses a regional cooling system simulation test device as described above, and includes the following steps:

[0029] The steady-state flow distribution test for multiple cooled devices is as follows:

[0030] The console acquires the user-preset value and controls the remote flow regulating valve of the bypass branch to open, closes the remote flow regulating valves of the first, second, and third cooling branches, starts the centrifugal pump, and adjusts the remote flow regulating valve of the bypass branch according to the user-preset value. When the cooling water in the water tank flows into the centrifugal pump discharge pipe and then into the main pipeline, the flow meter data of the main pipeline and the pressure sensor data of the bypass branch are at the user-preset value. The remote flow regulating valves of the first, second, and third cooling branches are gradually opened and the remote flow regulating valves of the bypass branch are adjusted in coordination. The flow meter data of the cooled equipment in the first, second, and third cooling branches and the sub-branches of each branch are gradually stabilized to the user-preset value. The period and step size of the remote flow regulating valve, and the time taken for the flow meter and pressure sensor to reach the user-preset value are observed and recorded.

[0031] After stopping the centrifugal pump and closing the remote flow control valve at the control console, the user preset value is acquired again. After the flow meter data of the main pipeline and the pressure sensor data of the bypass branch reach the user preset value, the remote flow control valves of the first cooling branch and the third cooling branch are gradually opened and the remote flow control valves of the bypass branch are adjusted in coordination. It is observed whether the flow meter data of the cooled equipment in the first cooling branch, the third cooling branch and each branch can be stabilized to the user preset value and the deviation is within 0±5%. The cycle and step size of the remote flow control valve, and the time taken for the flow meter and pressure sensor to reach the user preset value are observed and recorded.

[0032] After stopping the centrifugal pump and closing the remote flow control valve at the control console, the user preset value is acquired again. After the flow meter data of the main pipeline and the pressure sensor data of the bypass branch reach the user preset value, the remote flow control valves of the second and third cooling branches are gradually opened and the remote flow control valves of the bypass branch are adjusted in coordination. It is observed whether the flow meter data of the cooled equipment in the second and third cooling branches and each branch can be stabilized to the user preset value and the deviation is within 0±5%. The cycle and step size of the remote flow control valve, and the time taken for the flow meter and pressure sensor to reach the user preset value are observed and recorded.

[0033] The multi-condition dynamic flow balance test is as follows:

[0034] After the first, second, and third cooling branches are stable, close the sub-branches corresponding to the even-numbered devices in the first cooling branch and the sub-branches corresponding to the odd-numbered devices in the second cooling branch. At this time, the flow meters will change. Adjust the remote flow regulating valves on the bypass branch, the first cooling branch, the second cooling branch, and the third cooling branch, and observe whether the flow meter data of the cooled devices in the first, second, and third cooling branches and the sub-branches can be stabilized to the user preset value and the deviation is within 0±5%. Observe and record the cycle and step size of the remote flow regulating valve, and the time taken for the flow meter and pressure sensor to reach the user preset value.

[0035] After stopping the centrifugal pump and closing the remote flow control valve at the control console, and once the first, second, and third cooling branches have stabilized, close the sub-branches corresponding to the cooled equipment with odd-numbered sequence numbers in the first cooling branch, and close the sub-branches corresponding to the cooled equipment with even-numbered sequence numbers in the second cooling branch. At this time, the flow meter will change. Adjust the remote flow control valves on the bypass branch, the first cooling branch, the second cooling branch, and the third cooling branch, and observe whether the flow meter data of the cooled equipment in the first, second, and third cooling branches and the sub-branches of each branch can stabilize to the user preset value, and the deviation is within 0±5%. Observe and record the cycle and step size of the remote flow control valve, and the time taken for the flow meter and pressure sensor to reach the user preset value.

[0036] After stopping the centrifugal pump and closing the remote flow control valve at the control console, and after the first, second, and third cooling branches have stabilized, close the sub-branch corresponding to the cooled equipment in the first cooling branch. At this time, the flow meter will change. Adjust the remote flow control valves on the bypass branch, the second cooling branch, and the third cooling branch, and observe whether the data of the flow meter of the cooled equipment in the second and third cooling branches and the sub-branch of each branch can stabilize to the user preset value, and the deviation is within 0±5%. Observe and record the cycle and step size of the remote flow control valve, and the time taken for the flow meter and pressure sensor to reach the user preset value.

[0037] The optimal valve control strategy is formulated based on data from steady-state flow distribution tests and dynamic flow balance tests under multiple operating conditions for multiple cooled equipment.

[0038] Preferably, the method includes: if the data of the flow meter of the cooled equipment fails to stabilize to the user preset value and / or exceeds the deviation, adjusting the corresponding remote-controlled flow regulating valve until it stabilizes to the user preset value and meets the deviation.

[0039] The present invention proposes a regional cooling system simulation test device and test method, which uses automatic control to solve the problems faced by manually adjusting the regional cooling system, so as to conduct regional multi-user steady-state flow distribution test, multi-condition dynamic flow balance test and other tests, to verify the effectiveness and reliability of the control strategy and to mitigate technical risks in advance. Attached Figure Description

[0040] Figure 1 A schematic diagram of a regional cooling system simulation test device provided in an embodiment of the present invention;

[0041] Figure 2 A flowchart illustrating the operation of activating all three cooling branches in a regional cooling system simulation test method provided in an embodiment of the present invention.

[0042] Figure 3 This is a flowchart illustrating the operation of opening the first and third cooling branches in a regional cooling system simulation test method provided by an embodiment of the present invention.

[0043] Figure 4 This is a flowchart illustrating the operation of activating the second and third cooling branches in a regional cooling system simulation test method provided in an embodiment of the present invention.

[0044] Figure 5 This is a flowchart of the operation process of the multi-condition dynamic flow balance test 1 provided in an embodiment of the present invention;

[0045] Figure 6 This is a flowchart of the operation process for the multi-condition dynamic flow balance test 2 provided in an embodiment of the present invention;

[0046] Figure 7 This is a flowchart of the multi-condition dynamic flow balance test 3 provided in an embodiment of the present invention;

[0047] Figure label:

[0048] 1-Control console, 2-Centrifugal pump, 3-Stop check valve, 4-Flow meter, 5-Stop valve

[0049] 6-Remote control flow regulating valve, 7-Pressure sensor, 8-Static balance valve, 9-Throttle orifice plate, 10-Serpentine tube. Detailed Implementation

[0050] The present invention will be further illustrated below with reference to specific embodiments. It should be understood that these embodiments are for illustrative purposes only and are not intended to limit the scope of the invention. Furthermore, it should be understood that after reading the teachings of this invention, those skilled in the art can make various alterations or modifications to the invention, and these equivalent forms also fall within the scope defined by the appended claims.

[0051] This invention provides a regional cooling system simulation test device, including: a control console 1, a centrifugal pump 2, a check valve 3, a flow meter 4, a shut-off valve 5, a remote-controlled flow regulating valve 6, a pressure sensor 7, a static balancing valve 8, an orifice plate 9, a serpentine pipe 10, and a water tank, among other basic components. The number of branches varies among different regional cooling systems; a schematic diagram of a typical regional cooling system simulation test device is shown below. Figure 1The typical area cooling system simulation test device includes a main pipeline and multiple branch pipelines. From bottom to top, the branch pipelines are divided into a centrifugal pump discharge pipeline, a bypass branch, a first cooling branch, a second cooling branch, and a third cooling branch. Each of the first, second, and third cooling branches has a different number of cooling water users (equipment being cooled). The first cooling branch contains 1 to 6 users, the second cooling branch contains 7 to 8 users, and the third cooling branch contains 9 to 11 users.

[0052] One end of the centrifugal pump discharge pipe, one end of the bypass branch, one end of the first cooling branch, one end of the second cooling branch, and one end of the third cooling branch are all connected to the water tank. The other end of the centrifugal pump discharge pipe is connected to the other end of the bypass branch and one end of the main pipe, respectively. The other end of the main pipe is connected to the other end of the first cooling branch, the other end of the second cooling branch, and the other end of the third cooling branch, respectively.

[0053] The main pipeline is equipped with a flow meter 4 and multiple serpentine tubes 10. The flow meter 4 is located at the other end of the first cooling branch, the other end of the second cooling branch, and the other end of the third cooling branch.

[0054] The first, second, and third cooling branches are each equipped with a static balancing valve 8, a flow meter 4, and a remote-controlled flow regulating valve 6. The remote-controlled flow regulating valve 6 is connected to the inlet of a sub-branch corresponding to the first, second, and third cooling branches to control the number of devices being cooled. Each sub-branch is equipped with a static balancing valve 8, a throttling orifice plate 9, a flow meter 4, a pressure sensor 7, and a shut-off check valve 3. The outlets of multiple sub-branches are combined according to the corresponding first, second, and third cooling branches and are connected to the shut-off check valve 3 respectively.

[0055] The bypass branch is equipped with a flow meter 4, a shut-off valve 5, a remote-controlled flow regulating valve 6, a pressure sensor 7, and a shut-off check valve 3.

[0056] The centrifugal pump discharges cooling water from the water tank at one end of the pipeline, which then flows into the main pipeline and the bypass branch. The cooling water flowing into the bypass branch returns to the water tank, while the cooling water flowing into the main pipeline flows back to the water tank through the first cooling branch, the second cooling branch, the third cooling branch, and the corresponding sub-branch.

[0057] The parameters of centrifugal pump 2 and the pipe diameter of the centrifugal pump discharge pipeline were determined by scale-down tests based on the principle of similarity of hydraulic characteristics.

[0058] The bypass branch adjusts the flow rate into the main pipeline by regulating the remote flow regulating valve 6, which in turn regulates the flow rate into the first cooling branch, the second cooling branch, and the third cooling branch, so as to ensure that the water volume of each branch meets the system test requirements.

[0059] The number of serpentine tubes 10 is determined based on the friction loss characteristics of the simulated pipeline, calculated using serpentine tube resistance data.

[0060] The opening size of the throttling orifice plate 9 is determined based on the simulated local resistance loss characteristics of the cooled equipment.

[0061] The remote-controlled flow regulating valve 6 is an electric flow regulating valve. The electric flow regulating valve is connected to the control console 1. The control console 1 controls the electric flow regulating valve to regulate the flow changes of the bypass branch, the first cooling branch, the second cooling branch and the third cooling branch, simulating the multi-user steady-state flow distribution test and the multi-condition dynamic flow balance test.

[0062] The static balancing valve 8 is a flange type, which ensures that the system is in a static balanced state after operation. During installation, it is pre-adjusted using professional equipment according to the flow rate and pressure difference requirements of the first, second, and third cooling branches to ensure that the pressure on both sides is relatively balanced.

[0063] Control console 1, acting as the control unit, is connected to the centrifugal pump, pressure sensor 7, flow meter 4, centrifugal pump 2, shut-off check valve 3, shut-off valve 5, remote-controlled flow regulating valve 6, and static balancing valve 8. By acquiring data from pressure sensor 7 and flow meter 4, it adjusts centrifugal pump 2, shut-off check valve 3, shut-off valve 5, remote-controlled flow regulating valve 6, and static balancing valve 8 to achieve automatic system control. Control console 1 mainly consists of a computer, PLC controller, and switching power supply. Internally, control console 1 has three input interfaces: AC380V, AC220V, and DC24V. A series of protective measures reduce interference between input currents, ensuring the accuracy of test data.

[0064] The human-machine interface of console 1 displays the real-time pressure and flow values ​​of the main pipeline, bypass branch, first cooling branch, second cooling branch, third cooling branch, and multiple sub-branches; the motor operating status of centrifugal pump 2; the opening and closing status of check valve 3, shut-off valve 5, remote control flow regulating valve 6, and static balance valve 8; the pressure parameter setting box for the main pipeline; the flow value setting boxes for the bypass branch, first cooling branch, second cooling branch, and third cooling branch; and the motor speed setting box for the centrifugal pump.

[0065] This invention also provides a method for simulating a regional cooling system, using a regional cooling system simulation test apparatus as described above, comprising the following steps:

[0066] 1) Multi-user steady-state traffic allocation test.

[0067] All three cooling branches (first, second, and third) were turned on to conduct a multi-user steady-state flow distribution test. Figure 2 As shown.

[0068] Turn on console 1 and set the parameters through the flow rate setting boxes for bypass branch, first cooling branch, second cooling branch and third cooling branch, centrifugal pump motor speed setting box and main pipeline pressure parameter setting box on the human-machine interface.

[0069] During operation, console 1 controls the opening of the remote-controlled flow regulating valve 6 of the bypass branch, and closes the remote-controlled flow regulating valves 6 of the first, second, and third cooling branches. The stainless steel centrifugal pump 2 is started, allowing cooling water to flow into the pump's discharge pipe. Console 1 automatically adjusts the electric flow regulating valve to stabilize the pressure and flow rate of the main pipeline at the set values. Then, it automatically and gradually opens the remote-controlled flow regulating valves 6 of the first, second, and third cooling branches, coordinating with the adjustment of the bypass branch's remote-controlled flow regulating valve 6 to gradually stabilize the flow rate of the users in the first, second, and third cooling branches and their sub-branches to the set values. The flow rate of the users in the first, second, and third cooling branches and their sub-branches is observed and recorded to ensure it reaches the set values. After the test, pressing the stop button on console 1 automatically stops the centrifugal pump 2 and closes the remote-controlled flow regulating valve 6.

[0070] The first and third cooling branches are open, and the second cooling branch is closed. Figure 3 As shown.

[0071] Turn on console 1 and set the parameters through the flow rate setting boxes for bypass branch, first cooling branch and third cooling branch, centrifugal pump motor speed setting box and main pipeline pressure parameter setting box on the human-machine interface.

[0072] During operation, console 1 controls the opening of the remote-controlled flow regulating valve 6 of the bypass branch, and closes the remote-controlled flow regulating valves 6 of the first, second, and third cooling branches. The stainless steel centrifugal pump 2 is started, allowing cooling water to flow into the centrifugal pump discharge pipe. Console 1 automatically adjusts the electric flow regulating valve to stabilize the pressure and flow rate of the main pipeline at the set values. Then, it automatically and gradually opens the remote-controlled flow regulating valves 6 of the first and third cooling branches, coordinating with the adjustment of the remote-controlled flow regulating valves 6 of the bypass branch to gradually stabilize the flow rate of the users in the first and third cooling branches and their corresponding sub-branches to the set values. The flow rate of the users in the first and third cooling branches and their respective sub-branches is observed and recorded to ensure that the deviation is within 0±5%. After the test, pressing the stop button on console 1 automatically stops the centrifugal pump 2 and then closes the remote-controlled flow regulating valve 6.

[0073] The second and third cooling branches are open, while the first cooling branch is closed. Figure 4 As shown.

[0074] Turn on console 1 and set the parameters through the flow rate setting boxes for the bypass branch, the second cooling branch, and the third cooling branch, the motor speed setting box for the centrifugal pump, and the pressure parameter setting box for the main pipeline on the human-machine interface.

[0075] During operation, control console 1 opens the remote-controlled flow regulating valve 6 of the bypass branch, closes the remote-controlled flow regulating valves 6 of the first, second, and third cooling branches, and starts the stainless steel centrifugal pump 2, allowing cooling water to flow into the centrifugal pump discharge pipe. Control console 1 automatically adjusts the electric flow regulating valve to stabilize the pressure and flow rate of the main pipeline at the set values. Then, it automatically and gradually opens the remote-controlled flow regulating valves 6 of the second and third cooling branches, coordinating with the adjustment of the remote-controlled flow regulating valves 6 of the bypass branch to gradually stabilize the flow rate of the users in the second and third cooling branches and their corresponding sub-branches to the set values. Observe and record whether the flow rate of the users in the second and third cooling branches and their respective sub-branches reaches the set values, with a deviation within 0±5%. After the test, pressing the stop button on control console 1 automatically stops the centrifugal pump 2 and then closes the remote-controlled flow regulating valve 6.

[0076] 2) Dynamic flow balance test under multiple operating conditions.

[0077] After the first, second, and third cooling branches are all stable, shut down users 2, 4, and 6 in the first cooling branch and user 7 in the second cooling branch. See the operation flowchart. Figure 5 .

[0078] Turn on console 1 and set the parameters through the flow rate setting boxes for bypass branch, first cooling branch, second cooling branch and third cooling branch, centrifugal pump motor speed setting box and main pipeline pressure parameter setting box on the human-machine interface.

[0079] During operation, the control console 1 opens the remote flow regulating valve 6 of the bypass branch, closes the remote flow regulating valves 6 of the first cooling branch, the second cooling branch, and the third cooling branch, starts the centrifugal pump 2 made of stainless steel, so that cooling water flows into the centrifugal pump discharge pipe. The control console 1 automatically adjusts the electric flow regulating valve to stabilize the pressure and flow of the main pipeline at the set value, and then automatically and gradually opens the remote flow regulating valves 6 of the first cooling branch, the second cooling branch, and the third cooling branch.

[0080] Close the sub-branches corresponding to users 2, 4, and 6 in the first cooling branch and the sub-branchovering valve corresponding to user 7 in the second cooling branch. The flow rate will change. Adjust the remote-controlled flow regulating valve 6 on the bypass branch, the first cooling branch, the second cooling branch, and the third cooling branch to stabilize the flow rate of users in the first cooling branch, the second cooling branch, the third cooling branch, and the sub-branches of each branch to the set value. Observe and record whether the flow rate of users in the first cooling branch, the second cooling branch, the third cooling branch, and the sub-branches of each branch reaches the set value; the deviation should be between 0±5%. After the test, press the stop button on control panel 1. Control panel 1 will automatically stop the centrifugal pump 2 and then close the remote-controlled flow regulating valve 6.

[0081] After the first, second, and third cooling branches are all stable, shut down users 1 and 5 in the first cooling branch and user 8 in the second cooling branch. See the operation flowchart. Figure 6 .

[0082] Turn on console 1 and set the parameters through the flow rate setting boxes for bypass branch, first cooling branch, second cooling branch and third cooling branch, centrifugal pump motor speed setting box and main pipeline pressure parameter setting box on the human-machine interface.

[0083] During operation, the control console 1 opens the remote flow regulating valve 6 of the bypass branch, closes the remote flow regulating valves 6 of the first cooling branch, the second cooling branch, and the third cooling branch, starts the centrifugal pump 2 made of stainless steel, so that cooling water flows into the centrifugal pump discharge pipe. The control console 1 automatically adjusts the electric flow regulating valve to stabilize the pressure and flow of the main pipeline at the set value, and then automatically and gradually opens the remote flow regulating valves 6 of the first cooling branch, the second cooling branch, and the third cooling branch.

[0084] Close the sub-branches corresponding to users 1 and 5 in the first cooling branch and the sub-branches corresponding to users 8 in the second cooling branch. The flow rate will change. Adjust the remote-controlled flow regulating valves 6 on the bypass branch, the first cooling branch, the second cooling branch, and the third cooling branch to stabilize the flow rate of users in the first cooling branch, the second cooling branch, the third cooling branch, and the sub-branches of each branch to the set value. Observe and record whether the flow rate of users in the first cooling branch, the second cooling branch, the third cooling branch, and the sub-branches of each branch reaches the set value; the deviation should be between 0±5%. After the test, press the stop button on control panel 1. Control panel 1 will automatically stop the centrifugal pump 2 and then close the remote-controlled flow regulating valve 6.

[0085] After the first, second, and third cooling branches are all stable, shut down the first cooling branch. See the flowchart for the operation process. Figure 7 .

[0086] Turn on console 1 and set the parameters through the flow rate setting boxes for bypass branch, first cooling branch, second cooling branch and third cooling branch, centrifugal pump motor speed setting box and main pipeline pressure parameter setting box on the human-machine interface.

[0087] During operation, the control console 1 opens the remote flow regulating valve 6 of the bypass branch, closes the remote flow regulating valves 6 of the first cooling branch, the second cooling branch, and the third cooling branch, starts the centrifugal pump 2 made of stainless steel, so that cooling water flows into the centrifugal pump discharge pipe. The control console 1 automatically adjusts the electric flow regulating valve to stabilize the pressure and flow of the main pipeline at the set value, and then automatically and gradually opens the remote flow regulating valves 6 of the first cooling branch, the second cooling branch, and the third cooling branch.

[0088] Close the first cooling branch. The flow rate will change. Adjust the remote-controlled flow regulating valves 6 on the bypass branch, second cooling branch, and third cooling branch to stabilize the flow rate for users in the second and third cooling branches and their sub-branches at the set value. Observe and record whether the flow rate for users in the second and third cooling branches and their sub-branches reaches the set value; the deviation should be within 0±5%. After the test, press the stop button on control panel 1. Control panel 1 will automatically stop the centrifugal pump 2 and then close the remote-controlled flow regulating valves 6.

[0089] Throughout the experiment, data such as the cycle and step size of the remote-controlled flow regulating valve 6 and the system settling time were measured. Based on the data obtained, the optimal valve control strategy was analyzed and formulated.

[0090] The embodiments of the present invention have the following beneficial effects:

[0091] 1) A scaled-down test device was constructed using the similarity of hydraulic characteristics to replace the real cooling system for control strategy simulation tests.

[0092] 2) The test device can simulate multi-user steady-state flow distribution test and multi-condition dynamic flow balance test.

[0093] 3) Static pressure loss or pipeline friction loss is simulated by using serpentine tubes; the actual local throttling loss of cooling equipment is simulated by using orifice plates; the scale and cost of the test device are reduced by using these technical measures, and the regional cooling system is simulated.

[0094] 4) The test device occupies little space, and the valves and sensors are arranged in a way that facilitates operation and inspection.

[0095] 5) The test device is simple to set up and install, and has a short commissioning cycle.

[0096] 6) The test apparatus was used to test the optimal control strategy of the automatic regulating valve.

[0097] The key technical points of this invention are as follows:

[0098] 1) A flow balance control scheme is composed of flow regulation components such as static balancing valves, remote-controlled flow regulating valves, and flow meters.

[0099] 2) A serpentine pipe is used to simulate local pressure loss and friction loss along the pipeline.

[0100] 3) Use a throttling orifice plate to simulate the actual local throttling loss of the cooling equipment.

[0101] 4) A scaled-down test device was constructed using the similarity of hydraulic characteristics.

Claims

1. A regional cooling system simulation test device, characterized in that, include: One end of the centrifugal pump discharge pipe, one end of the bypass branch, one end of the first cooling branch, one end of the second cooling branch, and one end of the third cooling branch are all connected to the water tank. The other end of the centrifugal pump discharge pipe is connected to the other end of the bypass branch and one end of the main pipe, respectively. The other end of the main pipe is connected to the other end of the first cooling branch, the other end of the second cooling branch, and the other end of the third cooling branch, respectively. The first, second, and third cooling branches are all equipped with static balancing valves, flow meters, and remote-controlled flow regulating valves. The first cooling branch, the second cooling branch, and the third cooling branch are each connected to the same number of sub-branches as the equipment being cooled. Each sub-branch is equipped with a static balancing valve, a pressure sensor, and a flow meter. The main pipeline is equipped with a flow meter; The bypass branch is equipped with a flow meter, a remote-controlled flow regulating valve, and a pressure sensor; A centrifugal pump is installed in the centrifugal pump discharge line; The centrifugal pump discharge pipe draws cooling water from the water tank at one end, which flows into the main pipeline and the bypass branch. The cooling water flowing into the bypass branch returns to the water tank, and the cooling water flowing into the main pipeline returns to the water tank through the first cooling branch, the second cooling branch, the third cooling branch, and the corresponding sub-branch. The control console controls the activation of static balancing valves, remote flow regulating valves, and centrifugal pumps to control the corresponding pipeline flow. Based on the data collected from flow meters and pressure sensors, it compares whether the corresponding pipelines have reached the user's preset values. It also constructs scaled-down tests using the similarity of hydraulic characteristics to simulate steady-state flow distribution tests of multiple cooling devices and dynamic flow balance tests under multiple operating conditions. Based on the cycle and step size of the remote flow regulating valves and the time taken for the flow meters and pressure sensors to reach the user's preset values ​​during the tests, it formulates the optimal valve control strategy based on the data from the dynamic flow balance tests under multiple operating conditions. The multi-condition dynamic flow balance test is as follows: After the first, second, and third cooling branches are stable, close the sub-branches corresponding to the even-numbered devices in the first cooling branch and the sub-branches corresponding to the odd-numbered devices in the second cooling branch. At this time, the flow meters will change. Adjust the remote flow regulating valves on the bypass branch, the first cooling branch, the second cooling branch, and the third cooling branch, and observe whether the flow meter data of the cooled devices in the first, second, and third cooling branches and the sub-branches can be stabilized to the user preset value and the deviation is within 0±5%. Observe and record the cycle and step size of the remote flow regulating valve, and the time taken for the flow meter and pressure sensor to reach the user preset value. After stopping the centrifugal pump and closing the remote flow control valve at the control console, and once the first, second, and third cooling branches have stabilized, close the sub-branches corresponding to the cooled equipment with odd-numbered sequence numbers in the first cooling branch, and close the sub-branches corresponding to the cooled equipment with even-numbered sequence numbers in the second cooling branch. At this time, the flow meter readings will change. Adjust the remote flow control valves on the bypass branch, the first cooling branch, the second cooling branch, and the third cooling branch, and observe whether the flow meter data of the cooled equipment in the first, second, and third cooling branches and the sub-branches of each branch can stabilize to the user preset value, and the deviation is within 0±5%. Observe and record the cycle and step size of the remote flow control valve, and the time taken for the flow meter and pressure sensor to reach the user preset value. After stopping the centrifugal pump and closing the remote flow control valve at the control console, and once the first, second, and third cooling branches have stabilized, close the sub-branch corresponding to the cooled equipment in the first cooling branch. At this time, the flow meter will change. Adjust the remote flow control valves on the bypass branch, the second cooling branch, and the third cooling branch, and observe whether the flow meter data of the cooled equipment in the second and third cooling branches and the sub-branch of each branch can stabilize to the user preset value, and the deviation is within 0±5%. Observe and record the cycle and step size of the remote flow control valve, and the time taken for the flow meter and pressure sensor to reach the user preset value.

2. The regional cooling system simulation test device as described in claim 1, characterized in that, The main pipeline is also equipped with a serpentine pipe. The number of serpentine pipes is determined by calculating the resistance data of the serpentine pipes based on the simulated pipeline friction loss characteristics, in order to simulate static pressure loss or pipeline friction loss.

3. The regional cooling system simulation test device as described in claim 1, characterized in that, The sub-branch is also equipped with a throttling orifice plate. The opening size of the throttling orifice plate is determined according to the local resistance loss characteristics of the simulated cooling equipment to simulate the real local throttling loss of the cooling equipment.

4. The regional cooling system simulation test device as described in claim 1, characterized in that, The parameters of the centrifugal pump and the pipe diameter of the centrifugal pump discharge pipeline were determined by scale-down tests based on the principle of similarity of hydraulic characteristics.

5. The regional cooling system simulation test device as described in claim 1, characterized in that, Each of the sub-branch, the first cooling branch, the second cooling branch, the third cooling branch, the bypass branch, and the centrifugal pump discharge pipeline is equipped with a shut-off check valve for unidirectional flow of cooling water.

6. The regional cooling system simulation test device as described in claim 1, characterized in that, The static balancing valve is a flange-type static balancing valve. Before installation, it is pre-adjusted using professional equipment according to the flow rate and pressure difference requirements of the first, second, and third cooling branches to ensure that the pressure on both sides of the flange-type static balancing valve is relatively balanced.

7. The regional cooling system simulation test device as described in claim 1, characterized in that, The control console includes a computer, a PLC controller, and a switching power supply. It has three input interfaces: AC380V, AC220V, and DC24V, to reduce interference between input currents and ensure the accuracy of test data.

8. The regional cooling system simulation test device as described in claim 7, characterized in that, The console also includes a human-machine interface for acquiring user-inputted preset values ​​and displaying data from pressure sensors and flow meters, the operating status of the centrifugal pump motor, the opening and closing status of the static balancing valve, and the opening and closing status of the remote-controlled flow regulating valve.

9. A method for simulating a regional cooling system, characterized in that, Using the regional cooling system simulation test apparatus as described in claim 1, the optimal valve control strategy further includes formulating an optimal valve control strategy based on steady-state flow distribution tests of multiple cooled devices: The steady-state flow distribution test for multiple cooled devices is as follows: The console acquires the user-preset value and controls the remote flow regulating valve of the bypass branch to open, closes the remote flow regulating valves of the first, second, and third cooling branches, starts the centrifugal pump, and adjusts the remote flow regulating valve of the bypass branch according to the user-preset value. When the cooling water in the water tank flows into the centrifugal pump discharge pipe and then into the main pipeline, the flow meter data of the main pipeline and the pressure sensor data of the bypass branch are at the user-preset value. The remote flow regulating valves of the first, second, and third cooling branches are gradually opened and the remote flow regulating valves of the bypass branch are adjusted in coordination. The flow meter data of the cooled equipment in the first, second, and third cooling branches and the sub-branches of each branch are gradually stabilized to the user-preset value. The period and step size of the remote flow regulating valve, and the time taken for the flow meter and pressure sensor to reach the user-preset value are observed and recorded. After stopping the centrifugal pump and closing the remote flow control valve at the control console, the user preset value is acquired again. After the flow meter data of the main pipeline and the pressure sensor data of the bypass branch reach the user preset value, the remote flow control valves of the first cooling branch and the third cooling branch are gradually opened and the remote flow control valves of the bypass branch are adjusted in coordination. It is observed whether the flow meter data of the cooled equipment in the first cooling branch, the third cooling branch and each branch can be stabilized to the user preset value and the deviation is within 0±5%. The cycle and step size of the remote flow control valve, and the time taken for the flow meter and pressure sensor to reach the user preset value are observed and recorded. After stopping the centrifugal pump and closing the remote flow control valve at the control console, the user preset value is acquired again. Once the flow meter data of the main pipeline and the pressure sensor data of the bypass branch reach the user preset value, the remote flow control valves of the second and third cooling branches are gradually opened, and the remote flow control valves of the bypass branch are adjusted accordingly. It is observed whether the flow meter data of the cooled equipment in the second and third cooling branches and each branch can stabilize to the user preset value, and the deviation is within 0±5%. The cycle and step size of the remote flow control valve, and the time taken for the flow meter and pressure sensor to reach the user preset value are observed and recorded.

10. The method for simulating a regional cooling system as described in claim 9, characterized in that, The method includes: if the data of the flow meter of the cooled equipment fails to stabilize to the user preset value and / or exceeds the deviation, adjusting the corresponding remote-controlled flow regulating valve until it stabilizes to the user preset value and meets the deviation.

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