Full-automatic system for closed cooling tower coil pipe pressure test

Abstract

The utility model relates to the technical field of cooling towers, in particular to a full-automatic system for closed cooling tower coil pipe pressure testing. Comprising a pressure test water tank, a control unit and a safety protection device, the safety protection device comprises a safety guardrail, a safety door, a safety ground mat placing area and a safety protection net, and the pressure test water tank used for placing a coil pipe is arranged in the safety guardrail; the safety door comprises an outer safety door arranged on the safety fence and two inner safety doors located between the safety fence and the pressure test water tank, a safety ground mat placement area is arranged between the two inner safety doors and located near the pressure test connector, and the inner wall of the pressure test water tank is connected with a safety protection net. According to the utility model, an automatic pressure test mode is adopted, the opening and closing of the valve are all controlled by the electric valve, the speed is fast, and the accuracy is high.

Description

Technical Field

[0001] This utility model relates to the field of cooling tower technology, specifically to a fully automatic system for pressure testing of closed-loop cooling tower coils. Background Technology

[0002] In the field of industrial technology, circulating cooling water is commonly used to cool large industrial equipment or to lower indoor temperatures in central air conditioning systems. After the chilled water exchanges heat with the equipment, hot water is sent at high speed through pipes to a cooling tower. There, it undergoes further heat exchange before being returned to the refrigeration equipment for recycling. This process primarily relies on a fan continuously operating at the top of the cooling tower, combined with a spray system to continuously dissipate heat from the packing module and coil module on one side.

[0003] Currently, in cooling tower production, the coil pressure testing process is crucial to the performance of the cooling tower. Inaccurate coil pressure test results will directly lead to water leakage and water energy loss, reduced thermal performance, and failure of energy-saving parameters, thus failing to meet design and customer requirements. Traditional manual pressure testing devices require employees to manually operate the valves, making it difficult for them to control the gas pressure entering the coil. They need to manually observe the pressure value and adjust the valve opening and closing as needed. Ordinary pressure testing tubes age after prolonged use and are not resistant to high pressure, posing significant safety risks. How to efficiently meet the coil production process according to design requirements and ensure leak-free coils is a major challenge currently faced. Utility Model Content

[0004] The purpose of this invention is to solve the above-mentioned technical problems and provide a fully automatic system for pressure testing of closed cooling tower coils.

[0005] The technical solution adopted by this utility model to achieve the above-mentioned objectives is: a fully automatic system for pressure testing of closed-loop cooling tower coils, characterized in that: it includes a pressure testing water tank, a control unit, and a safety protection device. The safety protection device includes a safety railing, a safety door, a safety mat placement area, and a safety net. The inside of the safety railing is the pressure testing water tank for placing the coils. The safety door includes an outer safety door opened on the safety railing and two inner safety doors located between the safety railing and the pressure testing water tank. The safety mat placement area is located between the two inner safety doors and is near the pressure testing joint. The inner wall of the pressure testing water tank is connected to the safety net. The control unit connected to the coils is provided on the outside of the pressure testing water tank. The control unit includes connected air lines A and B. Air line A includes a ball valve No. 1 and a main test air line, a main nitrogen air line, and a main test gas exhaust air line connected in parallel thereafter. Air line B includes a ball valve No. 4 and a backup test air line, a backup nitrogen air line, and a backup test gas exhaust air line connected in parallel thereafter.

[0006] The main test gas line is equipped with electronic pressure sensor No. 1. The A gas line is connected to the test coil through electronic pressure sensor No. 1 on one side of ball valve No. 1. The main nitrogen gas line is equipped with ball valve No. 2 and nitrogen pressure reducing valve No. 1. The A gas line is directly connected to the outlet after being connected to nitrogen pressure reducing valve No. 1 through ball valve No. 2. The main test gas exhaust gas line is equipped with ball valve No. 3 and silencer No. 1. The A gas line is connected to silencer No. 1 through ball valve No. 3.

[0007] The backup test gas line is equipped with electronic pressure sensor No. 2. The B gas line is connected to the test coil via electronic pressure sensor No. 2 on one side of ball valve No. 4. The backup nitrogen gas line is equipped with ball valve No. 5 and nitrogen pressure reducing valve No. 2. The B gas line is directly connected to the outlet after being connected to nitrogen pressure reducing valve No. 2 via ball valve No. 5. The backup test gas exhaust gas line is equipped with ball valve No. 6 and silencer No. 2. The B gas line is connected to silencer No. 2 via ball valve No. 6.

[0008] The system also includes an emergency stop switch, which is used to trigger system depressurization and disconnect the safety door from the pressure testing system in emergency situations.

[0009] This invention optimizes the traditional manual pressure testing device into an automatic one. The device employs an automatic pressure testing mode, with all valve opening and closing controlled by electric valves, ensuring high speed and accuracy. It incorporates interlocking controls for numerous valves and safety doors, and includes a safety mat. If any leakage is detected during the pressure test, the ball valve will automatically close, cutting off the air supply, while the pressure relief valve will automatically open, ensuring timely pressure release within the test pipeline. The safety mat's placement allows employees observing pressure near the test head to proactively initiate pressure relief operations, guaranteeing safety throughout the pressure testing process. Attached Figure Description

[0010] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0011] Figure 2 This is a schematic diagram of the structure of the control unit of this utility model;

[0012] In the diagram: 1. Safety railing; 2. Outer safety door; 3. Control unit; 4. Inner safety door one; 5. Inner safety door two; 6. Test pressure tank; 21. Ball valve No. 1; 22. Air circuit A; 23. Main test gas exhaust circuit; 24. Air circuit B; 25. Ball valve No. 4; 26. Electronic pressure sensor No. 2; 27. Backup nitrogen circuit; 28. Ball valve No. 5; 29. ​​Ball valve No. 6; 30. Backup test gas exhaust circuit; 31. Silencer No. 2; 32. Nitrogen pressure reducing valve No. 2; 33. Backup test gas circuit; 34. Ball valve No. 3; 35. Silencer No. 1; 36. Main nitrogen circuit; 37. Nitrogen pressure reducing valve No. 1; 38. Ball valve No. 2; 39. Main test gas circuit; 40. Electronic pressure sensor No. 1. Detailed Implementation

[0013] The present invention will now be described in detail with reference to the accompanying drawings and embodiments, but the present invention is not limited to the specific embodiments. Example

[0014] like Figures 1-2 As shown, a fully automatic system for pressure testing of closed-loop cooling tower coils includes a pressure testing water tank 6, a control unit 3, and safety protection devices. The safety protection devices include a safety railing 1, safety doors, a safety mat placement area, and a safety net. The safety railing 1 houses the pressure testing water tank 6 for coil placement. The safety doors include an outer safety door 2 on the safety railing 1 and two inner safety doors located between the safety railing 1 and the pressure testing water tank 6. The area between the two inner safety doors is the safety mat placement area. Located near the pressure test joint, the inner wall of the pressure test tank 6 is connected to a safety net; the outer side of the pressure test tank 6 is equipped with a control unit 3 connected to the coil, the control unit 3 includes connected air passage A 22 and air passage B 24; air passage A 22 includes ball valve 21 and its parallel main test air passage 39, main nitrogen air passage 36, and main test gas exhaust air passage 23; air passage B 24 includes ball valve 25 and its parallel parallel backup test air passage 33, backup nitrogen air passage 27, and backup test gas exhaust air passage 30.

[0015] The main test gas path 39 is equipped with a No. 1 electronic pressure sensor 40. The No. 1 ball valve 21 side of the A gas path 22 is connected to the coil to be tested through the No. 1 electronic pressure sensor 40. The main nitrogen gas path 36 is equipped with a No. 2 ball valve 38 and a No. 1 nitrogen pressure reducing valve 37. The A gas path 22 is connected to the No. 1 nitrogen pressure reducing valve 37 through the No. 2 ball valve 38 and then directly connected to the gas outlet. The main test gas exhaust gas path 23 is equipped with a No. 3 ball valve 34 and a No. 1 silencer 35. The A gas path 22 is connected to the No. 1 silencer 35 through the No. 3 ball valve 34.

[0016] The backup test gas path 33 is equipped with a No. 2 electronic pressure sensor 26. The No. 4 ball valve 25 side of the B gas path 24 is connected to the coil to be tested through the No. 2 electronic pressure sensor 26. The backup nitrogen gas path 27 is equipped with a No. 5 ball valve 28 and a No. 2 nitrogen pressure reducing valve 32. The B gas path 24 is connected to the No. 2 nitrogen pressure reducing valve 32 through the No. 5 ball valve 28 and then directly connected to the gas outlet. The backup test gas exhaust gas path 30 is equipped with a No. 6 ball valve 29 and a No. 2 silencer 31. The B gas path 24 is connected to the No. 2 silencer 31 through the No. 6 ball valve 29.

[0017] The system also includes an emergency stop switch, which is used to trigger system depressurization and disconnect the safety door from the pressure testing system in emergency situations.

[0018] The operating steps of this utility model are as follows:

[0019] 1. The employee opens the outer safety door 2 and enters the safety fence 1;

[0020] 2. Use a crane to hoist the coil into the test water tank 6, open the inner safety door 4, connect the test pipeline to the outlet on the coil extension pipe, and connect the safety chain to the coil;

[0021] 3. Close the outer safety door 2. The pressure testing system cannot work if the outer safety door 2 is not closed. When the pressure testing system is working, the outer safety door 2 cannot be opened. In case of emergency, the emergency stop switch can be pressed to trigger pressure relief and release the interlock.

[0022] 4. Navigate to the control unit 3's operating interface, select the desired program, and click "Execute." Ball valve 21 of gas line 22 automatically opens to purge gas, and electronic pressure sensor 40 displays the pressure in real time. Once the pressure reaches the program's required value, such as 2 MPa, ball valve 21 of gas line 22 automatically closes to maintain pressure. The program starts timing; after the required time, such as 20 minutes, ball valve 34 automatically opens to release gas from the coil, then automatically closes. During the pressure maintenance period, the alarm device activates. When the pressure value of electronic pressure sensor 40 decreases, for example, by 0.2 MPa, an alarm will sound to alert employees of a leak.

[0023] 5. Employees must walk back and forth within safety railing 1 to continuously observe the leakage of the coil;

[0024] 6. When employees walk into the area where the safety mat is placed between inner safety door 4 and inner safety door 5, the automatic pressure relief function will be triggered to ensure the safety of the pressure test process;

[0025] 7. Open the outer safety door 2, or trigger the safety mat to trigger the pressure relief. At this time, the employee enters the pressure test tank 6 and uses the method of spraying soapy water to perform leak detection work on the side of the coil.

[0026] 8. If a leak is found, repair it by welding. If no leak is found, wait for all the gas to escape, then use a crane to remove the coil.

[0027] 9. Open outer safety door 2 and allow employees to leave the pressure testing area.

[0028] The above description, in conjunction with preferred technical solutions, provides a further detailed explanation of this utility model. It should not be construed that the specific implementation of the utility model is limited to these descriptions. For those skilled in the art, simple deductions and substitutions can be made without departing from the concept of this utility model, and all such modifications and substitutions should be considered within the scope of protection of this utility model.

Claims

1. A fully automatic system for closed cooling tower coil pressure testing, characterized by: The test pressure tank, the control unit and the safety protection device are included, the safety protection device includes safety guardrails, safety doors, safety mat placement areas and safety nets, the inside of the safety guardrails is the test pressure tank for coil placement, the safety doors include outer safety doors opened on the safety guardrails and two inner safety doors between the safety guardrails and the test pressure tank, the safety mat placement areas are between the two inner safety doors, the safety mat placement areas are near the test pressure joints, and the inner walls of the test pressure tank are connected with the safety nets; the outer side of the test pressure tank is provided with the control unit connected with the coils, the control unit includes the A gas path and the B gas path in communication; the A gas path includes a No. 1 ball valve and a main test gas path, a main nitrogen gas path and a main test gas exhaust gas path connected in parallel behind the No. 1 ball valve; the B gas path includes a No. 4 ball valve and a standby test gas path, a standby nitrogen gas path and a standby test gas exhaust gas path connected in parallel behind the No. 4 ball valve.

2. A fully automatic system for pressure testing of closed cooling tower coils as claimed in claim 1 wherein: A No. 1 electronic pressure sensor is arranged on the main test gas path, and the No. 1 ball valve of the A gas path is connected with the coil to be tested through the No. 1 electronic pressure sensor; a No. 2 ball valve and a No. 1 nitrogen pressure reducing valve are arranged on the main nitrogen gas path, and the A gas path is connected with the No. 1 nitrogen pressure reducing valve through the No. 2 ball valve and then directly connected with the gas outlet; a No. 3 ball valve and a No. 1 silencer are arranged on the main test gas exhaust gas path, and the A gas path is connected with the No. 1 silencer through the No. 3 ball valve.

3. A fully automatic system for pressure testing of closed cooling tower coils as claimed in claim 1 wherein: A No. 2 electronic pressure sensor is arranged on the standby test gas path, and the No. 4 ball valve of the B gas path is connected with the coil to be tested through the No. 2 electronic pressure sensor; a No. 5 ball valve and a No. 2 nitrogen pressure reducing valve are arranged on the standby nitrogen gas path, and the B gas path is connected with the No. 2 nitrogen pressure reducing valve through the No. 5 ball valve and then directly connected with the gas outlet; a No. 6 ball valve and a No. 2 silencer are arranged on the standby test gas exhaust gas path, and the B gas path is connected with the No. 2 silencer through the No. 6 ball valve.

4. A fully automatic system for pressure testing of closed cooling tower coils as claimed in any one of claims 1 to 3, wherein: The system further includes an emergency stop switch for triggering system pressure relief and unlocking the interlocking of the safety doors and the test pressure system in emergency situations.

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