Heat pipe vacuum filling packaging control system and control method

Abstract

The present invention relates to a heat pipe vacuum filling and packaging control system and control method, and belongs to the field of heat pipe filling technology. The heat pipe vacuum filling and packaging system mainly includes a system sealing unit, a vacuum unit, a filling unit and a packaging unit. The photoelectric sensing switch is actuated, the induction heat pipe is installed, and after the inflation solenoid valve is opened, compressed gas is sent into the airbag to inflate the airbag, and the airbag expands to achieve system sealing. The vacuum solenoid valve and the vacuum pump are opened to vacuum the system; after the system is vacuumed, the filling regulating valve is opened to fill the heat pipe with working fluid; the oil cylinder pushes the movable sealing module forward, and the movable sealing module and the fixed sealing module clamp the heat pipe filling tube and seal it; after the heat pipe packaging is completed, the working fluid is recovered and blown away. The present invention realizes the automated control of the processes of system sealing, vacuuming, heat pipe filling, packaging, residual working fluid recovery, and blowing away, and the heat pipe vacuum packaging effect is good, and the working life of the heat pipe is significantly increased.

Description

Technical Field

[0001] The present invention relates to the technical field of heat pipe filling, and in particular to a heat pipe vacuum filling packaging control system and a control method. Background Art

[0002] Currently, waste heat resources in my country account for 23%-67% of total energy consumption, with a recoverable rate of 65%, indicating enormous potential for recovery. The remaining waste heat resources, which remain largely unrecovered, primarily consist of medium- and low-temperature waste heat. Due to their dispersed distribution and relatively low temperatures, recovery of these waste heat resources is difficult, placing high demands on the heat transfer efficiency and economic costs of recovery equipment. This presents a major bottleneck in the recovery of these waste heat resources.

[0003] A heat pipe is a high-efficiency heat exchange element that vaporizes and condenses the heat pipe medium. It has a series of advantages such as high heat transfer efficiency, simple structure, stable performance, no power required, no moving parts, high reliability, compact structure, wide applicable temperature range, low thermal resistance, and small temperature difference.

[0004] In the prior art, there are two main methods for filling heat pipes: 1. Boiling exhaust method; 2. Vacuum filling method. The boiling exhaust method makes it difficult to accurately control the filling amount of the working fluid, but the working fluid filling time is shorter. The vacuum filling method can accurately control the filling amount of the working fluid, but it requires the use of a vacuum pump unit and a quantitative filling pump. Each quantitative filling pump can only achieve quantitative filling for one heat pipe at a time, which is costly and takes a long time to fill. In addition, the existing vacuum packaging technology for heat pipes is not up to standard. After most heat pipes have been working for a period of time, the vacuum cannot be maintained and they cannot work normally.

[0005] The heat pipe filling and packaging process includes several steps. The existing filling and packaging process has a low degree of automation, and the various steps cannot be connected quickly and accurately, resulting in low production efficiency and quality of heat pipes. Summary of the Invention

[0006] The technical problem to be solved by the present invention is to provide a heat pipe vacuum filling packaging control system and control method to achieve automatic control of heat pipe filling and improve the production efficiency of heat pipes.

[0007] To solve the above technical problems, according to one aspect of the present invention, a heat pipe vacuum filling and packaging control system is provided, comprising a PLC controller, a system sealing control unit, a vacuuming control unit, a filling control unit, and a packaging control unit;

[0008] The system sealing control unit includes a photoelectric sensor switch, an air compressor, an airbag, an air compressor outlet pressure sensor, and an inflation solenoid valve. The airbag is located at the interface between the heat pipe perfusion tube and the perfusion pipeline, and the system is sealed by the airbag expansion. The airbag is connected to the air compressor outlet via the inflation pipeline. The photoelectric sensor is located at the heat pipe installation position to sense whether the heat pipe is installed. The air compressor pressure sensor is located on the inflation pipeline at the air compressor outlet to obtain the air compressor outlet pressure. The inflation solenoid valve is located on the inflation pipeline between the air compressor outlet pressure sensor and the airbag to start or stop inflation of the airbag. The air compressor and inflation solenoid valve are respectively connected to the PLC controller as actuators. The air compressor outlet pressure sensor is connected to the signal input terminal of the PLC controller.

[0009] The vacuum control unit includes a vacuum pump, a vacuum solenoid valve, and a vacuum gauge; the vacuum pump is connected to the perfusion pipeline via a vacuum pipeline; the vacuum solenoid valve and vacuum gauge are both arranged on the vacuum pipeline and are respectively connected to the PLC controller;

[0010] The filling control unit includes a liquid storage tank, a filling regulating valve, and an electromagnetic flowmeter; the liquid storage tank is connected to the heat pipe filling pipe through a filling pipeline, and the filling regulating valve and the electromagnetic flowmeter are both arranged on the filling pipeline and respectively connected to the PLC controller;

[0011] ——The packaging control unit includes an oil cylinder, a movable sealing module, a fixed sealing module, a front limiter and a rear limiter; the movable sealing module and the fixed sealing module are respectively arranged on both sides of the heat pipe perfusion tube, the movable sealing module is connected to the oil cylinder piston rod, and the movement of the oil cylinder piston drives the movable sealing module forward or backward; the front limiter and the rear limiter are respectively connected to the PLC controller.

[0012] Furthermore, the heat pipe vacuum filling packaging control system also includes a working fluid recovery control unit; the working fluid recovery control unit includes a solution recovery pump, a recovery tank, a recovery solenoid valve, a deflation solenoid valve and a recovery pipeline pressure sensor; the solution recovery pump is connected to the recovery tank, the recovery tank is connected to the perfusion pipeline through a recovery pipeline, the recovery solenoid valve and the recovery pipeline pressure sensor are arranged on the recovery pipeline and are respectively connected to the PLC controller; the deflation solenoid valve is arranged on the inflation pipeline between the inflation solenoid valve and the airbag.

[0013] Furthermore, the heat pipe vacuum filling packaging control system also includes a working fluid blowing control unit, which includes a purge solenoid valve connected to the PLC controller, the purge solenoid valve is arranged on the purge pipeline, and the purge solenoid valve is connected to the timer.

[0014] Furthermore, in the system sealing control unit, the inflation solenoid valve is connected to a timer.

[0015] Furthermore, the packaged control unit also includes a hydraulic station tank, a hydraulic station motor and a three-position four-way valve; the hydraulic station tank and the cylinder are connected through a hydraulic oil circuit, the hydraulic station motor is arranged on the hydraulic oil circuit at the outlet end of the hydraulic station tank, the three-position four-way valve is arranged on the hydraulic oil circuit between the hydraulic station motor and the cylinder, and the hydraulic station motor and the three-position four-way valve are connected to the PLC controller as actuators.

[0016] Furthermore, the filling control unit also includes a spare flow meter arranged on the filling pipeline and connected to the PLC controller.

[0017] According to another aspect of the present invention, a heat pipe vacuum canning packaging control method is provided, which adopts the heat pipe vacuum filling and packaging control system described above, including a sealing control method, a vacuuming control method, a canning control method, a packaging control method, a working medium recovery control method, and a working medium blowing control method;

[0018] The system sealing control method includes the following steps: first, a photoelectric sensor switch is actuated and the induction heat pipe is installed; second, whether the air compressor outlet pressure is higher than a preset value is determined; third, if it is higher than the preset value, the inflation solenoid valve is opened, compressed gas is sent into the airbag, and the airbag is inflated at a timed interval. The airbag expands to achieve system sealing; fourth, when the inflation solenoid valve is closed at the end of the timed interval;

[0019] The vacuuming control method comprises the following steps: first, after the inflation solenoid valve is closed, the vacuum solenoid valve and the vacuum pump are opened to vacuumize the system; second, when the vacuum degree in the vacuum pipe is lower than the optimal filling vacuum degree, the vacuum solenoid valve and the vacuum pump are closed, and the system vacuuming is completed;

[0020] The filling control method includes the following steps: first, when the system is vacuumed, the filling regulating valve is opened to fill the heat pipe with working fluid; second, when the cumulative filling flow rate reaches 90% of the optimal filling volume of the heat pipe, the opening of the filling regulating valve is reduced to 1.3 times the lowest range of the electromagnetic flowmeter, and low-flow filling is continued until the optimal filling volume of the heat pipe reaches 100%, and the filling is completed;

[0021] The packaging control method includes the following steps: first, when the heat pipe filling is completed, controlling the hydraulic station motor and the three-position four-way valve to pump hydraulic oil from the hydraulic station tank into the forward oil filling port of the oil cylinder, pushing the movable sealing module forward, and when the movable sealing module touches the front limiter, the movable sealing module and the fixed sealing module clamp and cut off the heat pipe filling tube to seal it; second, controlling the hydraulic station motor and the three-position four-way valve to pump hydraulic oil from the hydraulic station tank into the rearward oil filling port of the oil cylinder, causing the movable sealing module to retreat, and when the movable sealing module touches the rear limiter, the PLC controller turns the three-position four-way valve to the middle position, the oil cylinder stops running, and the packaging is completed;

[0022] The working fluid recovery control method comprises the following steps: first, when the rear limiter is actuated, the recovery solenoid valve and the solution recovery pump are opened, and the working fluid remaining in the pipeline is recovered to the recovery tank; second, when the pressure in the recovery pipeline is lower than the optimal recovery pressure, the venting solenoid valve is actuated, and the working fluid recovery is completed;

[0023] The working medium purge control method controls the purge solenoid valve to open when the air release solenoid valve is actuated, and performs timed purge on the system; when the timer ends, the purge is completed.

[0024] Furthermore, when the control program is running, the maximum value Pmax and the minimum value Pmin of the air compressor outlet pressure when the timer is turned on are collected, and the vacuuming time t1, the packaging time t2, the residual working fluid recovery time t3, and the purge time t4 are timed using a counter and a timer; if Pmax-Pmin>0.1MPa or t1, t2, t3, t4 are greater than the set working time, the alarm program is immediately started, the actuator is reset, and the corresponding power supply is disconnected.

[0025] The present invention can realize the automatic control of the processes including system sealing, vacuuming, heat pipe filling, heat pipe packaging, residual working medium recovery, and residual working medium blowing during the heat pipe manufacturing process. The automatic control of the heat pipe vacuum packaging of the present invention has a good effect and significantly increases the service life of the heat pipe.

[0026] The present invention has a wide range of applications. For heat pipes with different volumes and different filling volume requirements, relevant parameters can be changed on a touch screen or a host computer to manufacture heat pipes of different sizes. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] The drawings herein are used to provide further illustration of the present invention and constitute a part of this application. The illustrative embodiments of the present invention and their description are used to explain the present invention and do not constitute improper limitations on the present invention.

[0028] Figure 1 Schematic diagram of the control system of the present invention.

[0029] Figure 2 This is a control principle block diagram of the present invention.

[0030] Figure 3 This is a flow chart of the control method of the present invention.

[0031] 1-PLC controller; 2-infusion pipeline; 3-small liquid storage tank; 4-liquid level gauge for small liquid storage tank; 5-working fluid pump; 6-large liquid storage tank; 7-liquid level gauge for large liquid storage tank; 8-electromagnetic flowmeter; 9-backup flowmeter; 10-vacuum pump; 11-vacuum gauge; 12-vacuum solenoid valve; 13-vacuum pipeline; 14-liquid filling regulating valve; 15-purge pipeline; 16-purge solenoid valve; 17-solution recovery pump; 18-recovery pipeline pressure sensor; 19-recovery solenoid valve; 20-recovery pipeline; 21-Filling pipeline; 22-Deflation solenoid valve; 23-Inflation solenoid valve; 24-Air compressor outlet pressure sensor; 25-Air compressor; 26-Recovery tank; 27-Hydraulic pipeline; 28-Cylinder; 29-Front limiter; 30-Rear limiter; 31-Movable sealing module; 32-Airbag; 33-Inflation pipeline; 34-Heat pipe filling pipe; 35-Fixed sealing module; 36-Hydraulic station motor; 37-Hydraulic station oil tank; 38-Three-position four-way valve; 39-Photoelectric sensor switch; 40-Heat pipe. DETAILED DESCRIPTION

[0032] In order to make those skilled in the art better understand the present invention, the present invention is further clearly and completely described below in conjunction with the accompanying drawings and embodiments. It should be noted that, unless there is a conflict, the features in the embodiments and examples of this application can be combined with each other.

[0033] A preferred embodiment of the present invention provides a heat pipe vacuum filling and packaging control system, comprising a PLC controller 1, a system sealing control unit, a vacuuming control unit, a filling control unit, and a packaging control unit.

[0034] like Figure 1 As shown, in this embodiment, the control system primarily consists of a PLC controller, human-machine interface, sensors, and actuators. The actuators include solenoid valves, a working fluid pump, a vacuum pump, a solution recovery pump, an air compressor, and a hydraulic station motor. Sensors include a flow meter, a vacuum gauge, a pressure sensor, a photoelectric sensor, and a liquid level gauge. Data collected by sensors at various locations enables online monitoring and real-time control of the heat pipe's automated vacuum filling and packaging process, generating automatic alarms.

[0035] The system sealing control unit includes a photoelectric sensor switch 39 , an air compressor 25 , an air bag 32 , an air compressor outlet pressure sensor 24 and an inflation solenoid valve 23 .

[0036] The airbag 32 is arranged at the interface between the heat pipe perfusion pipe 34 and the perfusion pipeline 21. The system is sealed by the expansion of the airbag 32; the airbag 32 is connected to the outlet end of the air compressor 25 through the inflation pipeline 33.

[0037] The photoelectric sensor switch 39 is provided at the installation position of the heat pipe 40 and is used to sense whether the heat pipe is installed.

[0038] An air compressor outlet pressure sensor 24 is provided on the inflation pipe at the outlet of the air compressor 25. The air compressor outlet pressure sensor 24 collects the outlet pressure of the air compressor 25. The air compressor outlet pressure sensor 24 is connected to the PLC controller 1, and the PLC detects whether the outlet pressure of the air compressor 25 is higher than a preset value.

[0039] The inflation solenoid valve 23 is installed on the inflation line 33 between the air compressor outlet pressure sensor 24 and the airbag 32. The air compressor 25 and the inflation solenoid valve 23 are connected to the PLC controller as actuators. The PLC controller controls the air compressor 25 and the inflation solenoid valve 23 to start or stop inflation of the airbag 32.

[0040] The inflation solenoid valve 23 is connected to a timer to inflate the airbag 32 at a fixed time.

[0041] When the system sealing control unit is used to control the system sealing, the photoelectric sensor switch 39 is actuated to sense the installation of the heat pipe 40; it is determined whether the outlet pressure of the air compressor 25 is higher than a preset value. In this embodiment, the preset value is selected to be 0.5 MPa; if it is higher than the preset value, the inflation solenoid valve 23 is opened to send compressed gas into the airbag 32, and the airbag 32 is inflated at a timed manner. The airbag 32 expands and seals the interface between the heat pipe perfusion pipe 34 and the perfusion pipeline. When the timing ends, the inflation solenoid valve 23 is closed, and the system sealing is completed.

[0042] Among them, the vacuum control unit includes a vacuum pump 10, a vacuum solenoid valve 12 and a vacuum gauge 11; the vacuum pump 10 is connected to the perfusion pipeline 21 through a vacuum pipeline 13, and the vacuum solenoid valve 12 and the vacuum gauge 11 are both arranged on the vacuum pipeline 13 and are respectively connected to the PLC controller 1.

[0043] The system is vacuumed using the aforementioned vacuum control unit. The vacuum pump 10 is preferably a rotary vane vacuum pump, and the vacuum gauge 11 is preferably a resistance vacuum gauge. Once the system is sealed, the vacuum solenoid valve 12 and vacuum pump 10 are opened to evacuate the system. When the vacuum level within the system piping falls below the optimal filling vacuum, the vacuum solenoid valve 12 and vacuum pump 10 are closed, completing the system evacuation.

[0044] Among them, the filling control unit includes a liquid storage tank, a filling regulating valve 14 and an electromagnetic flowmeter 8; the liquid storage tank is connected to the heat pipe filling pipe 34 through the filling pipeline 21, and the filling regulating valve 14 and the electromagnetic flowmeter 8 are both arranged on the filling pipeline 21 and are respectively connected to the PLC controller 1.

[0045] A backup flow meter 9 is provided on the perfusion pipeline 21 and is connected to the PLC controller.

[0046] More specifically, in the filling unit, the liquid storage tanks include a small liquid storage tank 3 and a large liquid storage tank 6, which are connected by an infusion line 2, on which a working fluid pump 5 is provided. A small liquid storage tank level gauge 4 is provided on the small liquid storage tank 3, and a large liquid storage tank level gauge 7 is provided on the large liquid storage tank 6. Both the small liquid storage tank level gauge 4 and the large liquid storage tank level gauge 7 are connected to a PLC controller 1.

[0047] The filling control unit described above controls the system's filling process. After the system is evacuated, the filling control valve 14 is opened to fill the heat pipe 40 with the working fluid. Preferably, when the cumulative filling flow rate reaches 90% of the heat pipe's optimal filling volume, the opening of the filling control valve 14 is reduced to 1.3 times the minimum range of the electromagnetic flowmeter 8, and low-flow filling is continued until the heat pipe reaches 120% of its optimal filling volume, completing the process.

[0048] The package control unit includes an oil cylinder 28 , a movable sealing module 31 , a fixed sealing module 35 , a front stopper 29 and a rear stopper 30 .

[0049] The movable sealing module 31 and the fixed sealing module 35 are respectively arranged on either side of the heat pipe injection tube 34. The movable sealing module 31 is connected to the piston rod of the oil cylinder 28. The front end of the movable sealing module 31 is provided with a φ12mm arc surface that mates with the fixed sealing module 35. The movable sealing module 31 is fixed to the front end of the piston rod of the oil cylinder 28. The oil cylinder 28 drives the movable sealing module 31 forward or backward, achieving solid-phase welding of the heat pipe injection tube 34 through hydraulic power.

[0050] The front and rear stoppers 29 and 30 are used to limit the forward and backward movement of the movable sealing module 31. These stoppers are photoelectric sensors. When the front stopper 29 is high, the cold welding of the heat pipe perfusion pipe is completed, the oil cylinder piston stops moving forward and switches to moving backward. When the rear stopper 30 is high, the piston stops moving. The front and rear stoppers 29 and 30 are each connected to the PLC controller 1.

[0051] In addition, the packaged control unit also includes a hydraulic station tank 37, a hydraulic station motor 36, and a three-position, four-way valve 38. The hydraulic station tank 37 is connected to the oil cylinder 28 via a hydraulic oil circuit. The hydraulic station motor 36 is located on the hydraulic oil circuit at the outlet of the hydraulic station tank 37 and is connected to the PLC controller 1. The three-position, four-way valve 38 is located on the hydraulic oil circuit between the hydraulic station motor 36 and the oil cylinder 28 and is also connected to the PLC controller 1.

[0052] After the heat pipe filling is completed, the hydraulic station motor 36 is controlled to pump hydraulic oil from the hydraulic station tank 37 into the forward oil filling port of the cylinder 28, pushing the movable sealing module 31 forward. When it touches the front limiter 29, the movable sealing module 31 and the fixed sealing module 35 pinch and seal the heat pipe filling tube 34; then the hydraulic station motor 36 is controlled to pump hydraulic oil from the hydraulic station tank 37 into the rearward oil filling port of the cylinder 28, and the movable sealing module 31 retreats. When it touches the rear limiter 30, it stops retreating, and the packaging is completed.

[0053] In a preferred embodiment, the heat pipe vacuum filling packaging control system of the present invention includes a working fluid recovery control unit. The working fluid recovery control unit includes a solution recovery pump 17, a recovery tank 26, a recovery solenoid valve 19, a deflation solenoid valve 22, and a recovery pipeline pressure sensor 18. The solution recovery pump 17 is connected to the recovery tank 26, which is connected to the perfusion pipeline 21 via a recovery pipeline 20. The recovery solenoid valve 19 and the recovery pipeline pressure sensor 18 are installed on the recovery pipeline 20 and are respectively connected to the PLC controller 1. The deflation solenoid valve 22 is installed on the inflation pipeline 33 between the inflation solenoid valve 23 and the airbag 32.

[0054] After the heat pipe is packaged, the working fluid is recovered, the recovery solenoid valve 19 and the solution recovery pump 17 are opened, and the working fluid remaining in the system pipeline is recovered to the recovery tank 26; when the recovery pipeline pressure is lower than the optimal recovery pressure, the recovery solenoid valve 19 is actuated, and the working fluid recovery is completed.

[0055] In a preferred embodiment, the heat pipe vacuum filling packaging control system of the present invention includes a working fluid purge control unit. The working fluid purge control unit includes a purge solenoid valve 16 connected to the PLC controller 1. The air compressor 25 is connected to the filling pipeline 21 via the purge pipeline 15, and the purge solenoid valve 16 is disposed on the purge pipeline 15.

[0056] After the working fluid recovery is completed, the purge solenoid valve 16 is controlled to open and the system is purged regularly.

[0057] Another typical embodiment of the present invention provides a heat pipe vacuum canning packaging control method, which adopts the heat pipe vacuum filling and packaging control system described above, including a sealing control method, a vacuuming control method, a canning control method, a packaging control method, a working fluid recovery control method and a working fluid blowing control method.

[0058] The system sealing control method includes the following steps: first, the photoelectric sensor switch 39 is activated and the induction heat pipe 40 is installed; second, whether the air compressor outlet pressure is higher than a preset value is determined; third, if it is higher than the preset value, the inflation solenoid valve 23 is opened, compressed gas is sent into the airbag 32, and the airbag 32 is inflated at a timed manner. The airbag 32 expands to achieve system sealing; fourth, when the inflation solenoid valve 23 is closed at the timed end,

[0059] The vacuum control method comprises the following steps: first, after the inflation solenoid valve 23 is closed, the vacuum solenoid valve 12 and the vacuum pump 10 are opened to vacuum the system; second, when the vacuum degree in the vacuum pipe is lower than the optimal filling vacuum degree, the vacuum solenoid valve 12 and the vacuum pump 10 are closed, and the system vacuuming is completed;

[0060] The filling control method includes the following steps: first, after the system is evacuated, the filling regulating valve 14 is opened to fill the heat pipe 40 with the working medium; second, when the cumulative filling flow rate reaches 90% of the optimal filling volume of the heat pipe, the opening of the filling regulating valve 14 is reduced to 1.3 times the lowest range of the electromagnetic flowmeter, and the filling is continued at a low flow rate until the optimal filling volume of the heat pipe reaches 100%, and the filling is completed;

[0061] The packaging control method includes the following steps: first, when the heat pipe filling is completed, the hydraulic station motor 36 and the three-position four-way valve 38 are controlled to pump hydraulic oil from the hydraulic station tank 37 into the forward oil filling port of the oil cylinder 28, pushing the movable sealing module 31 forward. When it touches the front limiter 29, the movable sealing module 31 and the fixed sealing module 35 pinch off and seal the heat pipe filling pipe 34; second, the hydraulic station motor 36 and the three-position four-way valve 38 are controlled to pump hydraulic oil from the hydraulic station tank 37 into the backward oil filling port of the oil cylinder 28. The movable sealing module 31 retreats. When it touches the rear limiter 30, the PLC controller 1 turns the three-position four-way valve 38 to the middle position, the oil cylinder 28 stops running, and the packaging is completed;

[0062] The working fluid recovery control method includes the following steps: first, when the rear limiter 30 is actuated, the recovery solenoid valve 19 and the solution recovery pump 17 are opened, and the working fluid remaining in the pipeline is recovered to the recovery tank 26; second, when the pressure in the recovery pipeline is lower than the optimal recovery pressure, the venting solenoid valve is actuated, and the working fluid recovery is completed;

[0063] The working medium purge control method is as follows: when the air release solenoid valve 22 is actuated, the purge solenoid valve is controlled to open, and the system is purged at a fixed time; when the timing ends, the purge is completed.

[0064] refer to Figure 2 and Figure 3 The following embodiments provide a clear and complete description of the heat pipe vacuum filling packaging control method of the present invention.

[0065] (1) Enter the mode selection at the beginning. In the initial state, the solenoid valve is normally closed, the ammonia pump, vacuum pump 10, and solution recovery pump 17 are powered off, the air compressor 25 and the hydraulic station motor 36 are powered on, the movable sealing module 31 contacts the rear limiter 30, the photoelectric sensor switch 39 is activated, the equipment is normal, the liquid level of the small liquid storage tank 3 is higher than the safety level, and the manual mode is switched to the automatic mode;

[0066] (2) Set the optimal filling vacuum degree Po, optimal filling volume Qo, and optimal recovery pressure Pr of the heat pipe on the host computer;

[0067] (3) The control system monitors the vacuum degree P3 in the vacuum pipe, the air pressure P2 at the outlet of the air compressor 25, the filling flow rate Q1, the pressure P1 in the recovery pipe, the liquid level of the large liquid storage tank 6 and the small liquid storage tank 3, and other indicators online;

[0068] (4) Press the start switch, the control system starts to run, the photoelectric sensor switch 39 is activated, the heat pipe 40 is installed, and the air compressor outlet pressure P2 is judged to be higher than 0.5MPa. If yes, the inflation solenoid valve 23 is controlled to open, and the timer is used to time the inflation solenoid valve 23 for 5s. The compressed gas is sent to the airbag 32, and the airbag 32 expands to achieve system sealing. When the timer ends, the inflation solenoid valve 23 is closed; if no, wait for the air compressor 25 to inflate;

[0069] (5) After the system is sealed, the control system controls the vacuum solenoid valve 12 and the vacuum pump 10 to open, and determines whether the vacuum degree P3 in the vacuum pipe is lower than the optimal filling vacuum degree Po. When P3 is lower than the optimal filling vacuum degree Po, the vacuum solenoid valve 12 and the vacuum pump 10 are closed, and the vacuuming process is completed;

[0070] (6) Open the filling regulating valve 14, and the heat pipe working fluid flows from the small liquid storage tank 3 along the pipeline into the heat pipe. The heat pipe working fluid filling amount is read by the control system through the data of the electromagnetic flowmeter 8 and the backup flowmeter 9. The timer interrupt program is used to calculate the cumulative flow Q1 and judge whether the cumulative flow Q1 is equal to 90% of the optimal filling amount Qo of the heat pipe. If so, the PID control program of the control system sends a command to the filling regulating valve 14 to reduce the valve opening to 1.3 times the lowest range of the Q2 electromagnetic flowmeter 8, and fill with a small flow rate to prevent overshoot from affecting the accuracy of the cumulative flow until it reaches 120% of the optimal filling amount of the heat pipe. The filling is completed;

[0071] (7) When filling is completed, the control system controls the filling regulating valve 14 to close;

[0072] (8) Entering the packaging program, the control system controls the hydraulic station motor 36 to pump hydraulic oil from the hydraulic station tank 37 into the forward oil filling port of the oil cylinder 28, and the movable sealing module 31 moves forward and touches the front limiter 29. At this time, the movable sealing module 31 and the fixed sealing module 35 clamp and seal the heat pipe filling pipe; then, the control system controls the hydraulic station motor 36 to pump hydraulic oil from the hydraulic station tank 37 into the backward oil filling port of the oil cylinder 28, and the movable sealing module 31 moves backward and touches the rear limiter 30, stops moving backward, and the packaging is completed;

[0073] (9) The rear limiter 30 is activated, triggering the rising edge signal. The control system controls the residual working medium recovery solenoid valve 19 and the solution recovery pump 17 to open, and the gas phase working medium remaining in the pipeline is recovered to the recovery tank 26. It is judged whether the recovery pipeline pressure P1 is lower than the optimal recovery pressure Pr. If so, the control system controls the recovery solenoid valve and the venting solenoid valve 22 to operate.

[0074] (10) If no, continue to the previous step;

[0075] (11) The control system detects the rising edge signal of the bleed solenoid valve 22 and whether P1 is lower than the optimal recovery pressure Pr, the control system controls the purge solenoid valve 16 to open, and uses a timer to time the purge solenoid valve 16 for 12 minutes;

[0076] (12) After purging is completed, install the heat pipe again and repeat the steps.

[0077] Collect the maximum value Pmax and minimum value Pmin of the air compressor outlet pressure when the timer is turned on, and use the counter and timer to time the vacuum time t1, packaging time t2, residual working fluid recovery time t3, and purge time t4; if Pmax-Pmin>0.1MPa or t1, t2, t3, t4 are greater than the set working time, immediately start the alarm program, reset the actuator and disconnect the corresponding power supply, and display, record and save the fault information on the host computer.

[0078] The present invention realizes automatic vacuum filling and packaging of heat pipes by providing a heat pipe vacuum filling and packaging control system and control method; a PLC controller obtains and records the number of times the system completes packaging, and uses this record as the daily heat pipe manufacturing volume; and by using the PLC's timed interrupt accumulation program and PID control regulating valve to replace the expensive metering pump, the investment cost is reduced. By designing detection devices such as flow meters, vacuum gauges, pressure sensors, photoelectric induction switches and liquid level gauges, key parameters such as working fluid flow, vacuum degree, pressure, liquid level in the system are detected, thereby realizing online monitoring and real-time control of automatic vacuum filling and packaging of heat pipes.

[0079] The scope of protection claimed by the present invention is not limited to the above specific embodiments. For those skilled in the art, the present invention may have various variations and modifications. Any modifications, improvements and equivalent substitutions made within the concept and principle of the present invention should be included in the scope of protection of the present invention.

Claims

1. A heat pipe vacuum filling packaging control system, characterized by: Including PLC controller, system sealing control unit, vacuum control unit, filling control unit and packaging control unit; The system sealing control unit includes a photoelectric sensor switch, an air compressor, an airbag, an air compressor outlet pressure sensor, and an inflation solenoid valve. The airbag is located at the interface between the heat pipe perfusion tube and the perfusion pipeline, and the system is sealed by inflating the airbag. The airbag is connected to the air compressor outlet via the inflation pipeline. The photoelectric sensor is located at the heat pipe installation position to sense whether the heat pipe is installed. The air compressor outlet pressure sensor is located on the inflation pipeline at the air compressor outlet to obtain the air compressor outlet pressure. The inflation solenoid valve is located on the inflation pipeline between the air compressor outlet pressure sensor and the airbag to start or stop inflation of the airbag. The air compressor and inflation solenoid valve serve as actuators and are respectively connected to the PLC controller. The air compressor outlet pressure sensor is connected to the signal input terminal of the PLC controller. The vacuum control unit includes a vacuum pump, a vacuum solenoid valve, and a vacuum gauge; the vacuum pump is connected to the perfusion pipeline via a vacuum pipeline; the vacuum solenoid valve and vacuum gauge are both arranged on the vacuum pipeline and are respectively connected to the PLC controller; The filling control unit includes a liquid storage tank, a filling regulating valve, and an electromagnetic flowmeter; the liquid storage tank is connected to the heat pipe filling pipe through a filling pipeline, and the filling regulating valve and the electromagnetic flowmeter are both arranged on the filling pipeline and respectively connected to the PLC controller; The package control unit includes an oil cylinder, a movable sealing module, a fixed sealing module, a front stopper, and a rear stopper. The movable sealing module and the fixed sealing module are respectively arranged on both sides of the heat pipe perfusion pipe. The movable sealing module is connected to the oil cylinder piston rod. The movement of the oil cylinder piston drives the movable sealing module forward or backward. The front stopper and the rear stopper are respectively connected to the PLC controller. - A working fluid recovery control unit, comprising a solution recovery pump, a recovery tank, a recovery solenoid valve, a deflation solenoid valve, and a recovery pipeline pressure sensor; the solution recovery pump is connected to the recovery tank, which is connected to the perfusion pipeline via a recovery pipeline; the recovery solenoid valve and the recovery pipeline pressure sensor are arranged on the recovery pipeline and are respectively connected to the PLC controller; the deflation solenoid valve is arranged on the inflation pipeline between the inflation solenoid valve and the airbag; ——Working medium blowing control unit, including a purge solenoid valve connected to the PLC controller, the purge solenoid valve is arranged on the purge pipeline, and the purge solenoid valve is connected to the timer.

2. The heat pipe vacuum filling packaging control system according to claim 1, characterized in that: In the system sealing control unit, the inflation solenoid valve is connected to the timer.

3. The heat pipe vacuum filling packaging control system according to claim 2, characterized in that: The packaged control unit also includes a hydraulic station tank, a hydraulic station motor, and a three-position four-way valve; the hydraulic station tank and the oil cylinder are connected via a hydraulic oil circuit, the hydraulic station motor is arranged on the hydraulic oil circuit at the outlet end of the hydraulic station tank, the three-position four-way valve is arranged on the hydraulic oil circuit between the hydraulic station motor and the oil cylinder, and the hydraulic station motor and the three-position four-way valve are connected to the PLC controller as actuators; The filling control unit also includes a spare flow meter arranged on the filling pipeline and connected to the PLC controller.

4. A heat pipe vacuum filling packaging control method, characterized by: The heat pipe vacuum filling and packaging control system according to claim 3 includes a sealing control method, a vacuuming control method, a filling control method, a packaging control method, a working medium recovery control method, and a working medium blowing control method; The sealing control method includes the following steps: first, a photoelectric sensor switch is actuated and the induction heat pipe is installed; second, whether the air compressor outlet pressure is higher than a preset value is determined; third, if it is higher than the preset value, the inflation solenoid valve is opened, compressed gas is fed into the airbag, and the airbag is inflated at a timed interval. The airbag expands to achieve system sealing; fourth, when the inflation solenoid valve is closed at the end of the timed interval; The vacuuming control method comprises the following steps: first, after the inflation solenoid valve is closed, the vacuum solenoid valve and the vacuum pump are opened to vacuumize the system; second, when the vacuum degree in the vacuum pipe is lower than the optimal filling vacuum degree, the vacuum solenoid valve and the vacuum pump are closed, and the system vacuuming is completed; The filling control method includes the following steps: first, when the system is vacuumed, the filling regulating valve is opened to fill the heat pipe with working fluid; second, when the cumulative filling flow rate reaches 90% of the optimal filling volume of the heat pipe, the opening of the filling regulating valve is reduced to 1.3 times the lowest range of the electromagnetic flowmeter, and low-flow filling is continued until the optimal filling volume of the heat pipe reaches 100%, and the filling is completed; The packaging control method includes the following steps: first, when the heat pipe filling is completed, controlling the hydraulic station motor and the three-position four-way valve to pump hydraulic oil from the hydraulic station tank into the forward oil filling port of the oil cylinder, pushing the movable sealing module forward, and when the movable sealing module touches the front limiter, the movable sealing module and the fixed sealing module clamp and cut off the heat pipe filling tube to seal it; second, controlling the hydraulic station motor and the three-position four-way valve to pump hydraulic oil from the hydraulic station tank into the rearward oil filling port of the oil cylinder, causing the movable sealing module to retreat, and when the movable sealing module touches the rear limiter, the PLC controller turns the three-position four-way valve to the middle position, the oil cylinder stops running, and the packaging is completed; The working fluid recovery control method comprises the following steps: first, when the rear limiter is actuated, the recovery solenoid valve and the solution recovery pump are opened, and the working fluid remaining in the pipeline is recovered to the recovery tank; second, when the pressure in the recovery pipeline is lower than the optimal recovery pressure, the venting solenoid valve is actuated, and the working fluid recovery is completed; The working medium purge control method controls the purge solenoid valve to open when the bleed solenoid valve is actuated, and the system is purged at a fixed time; when the timing ends, the purge is completed; When the control program is running, the maximum value Pmax and the minimum value Pmin of the air compressor outlet pressure when the timer is turned on are collected, and the vacuuming time t1, the packaging time t2, the residual working fluid recovery time t3, and the purge time t4 are timed using a counter and a timer; if Pmax-Pmin>0.1MPa or t1, t2, t3, t4 are greater than the set working time, the alarm program is immediately started, the actuator is reset, and the corresponding power supply is disconnected.

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