Temperature control device for a polarizing device

Abstract

The application belongs to the technical field of electronic component manufacturing equipment, and particularly relates to a temperature control device of a polarization device, which comprises a polarization container, a polarization clamp, an insulating medium, a temperature increasing system, a temperature decreasing system, a PLC control circuit and a pressurizing system. The heating pipe is arranged in the polarization container filled with the insulating medium. The power regulator controls the output power of the heating pipe. When the temperature approaches the set temperature, the power of the heating pipe gradually decreases to achieve the purpose of accurate temperature control. The temperature uniformity of the insulating medium at different positions is achieved by increasing the heating pipe loop. After the insulating medium reaches the required temperature, the temperature control instrument sends a signal to the PLC control circuit. The pressurizing system applies voltage at a set voltage increasing speed. After the set maximum voltage reaches the pressure maintaining time, the temperature decreasing system is started. The insulating medium is input to the external circulation pipeline through the circulating oil pump, flows through the evaporator and returns to the polarization container. Compared with the traditional polarization device, the temperature control precision is high, and the temperature increasing and decreasing speed is fast.

Description

Technical Field

[0001] This invention belongs to the technical field of electronic component manufacturing equipment, and specifically relates to a temperature control device for polarization equipment. Background Technology

[0002] Piezoelectric ceramics typically require polarization to achieve the desired piezoelectric properties. The coercive field of ceramic materials generally decreases with increasing temperature. Therefore, maintaining a relatively high polarization temperature (130℃~160℃) and applying a certain DC high voltage at this temperature makes it easier to fully polarize the ceramic and obtain good piezoelectric properties. However, after polarization at a high temperature and the DC high voltage is removed, the high temperature causes depolarization, resulting in a loss of piezoelectric properties. To avoid or reduce this loss, the polarization temperature needs to be cooled to a certain level (usually 50℃~70℃) while maintaining the polarization voltage. Removing the applied voltage at this point reduces the loss of piezoelectric properties; this process is called temperature-controlled polarization in industrial production.

[0003] During piezoelectric ceramic polarization, silicone oil or transformer oil is generally used as the insulating medium. There are three main methods for heating the insulating medium: 1. Heating with an electric furnace at the bottom of the polarization tank (polarization container); 2. Heating with an infrared heating plate at the bottom of the polarization tank (polarization container); 3. Heating with an induction cooker at the bottom of the polarization tank (polarization container). Cooling of the insulating medium is mainly done by fan cooling, which typically takes about 75 minutes to cool from a high temperature to 50℃~70℃. Including the heating and pressure holding time, the entire temperature-controlled polarization process takes about 1.5 hours.

[0004] In response to the polarization methods described above and considering the problems discovered in actual production, the inventors believe that the following defects exist: ① The heating method for the insulating medium described above suffers from severe temperature transfer lag and poor temperature control accuracy during heating, making it prone to overheating; ② The temperature within the polarization tank is uneven, with some areas experiencing excessively high temperatures, leading to aging, thickening, and even smoking of the insulating medium under high temperature and pressure, resulting in high heating energy consumption; ③ Low cooling efficiency leads to excessively long cooling times. While ensuring the ceramic components can withstand the temperature cooling without cracking, the cooling rate should be as fast as possible; ④ The forced-air cooling fan in the polarization tank is usually located on the upper side of the workstation, posing certain safety hazards and resulting in an unclean work surface. Summary of the Invention

[0005] The technical problem solved by this invention is mainly the insufficient accuracy and cooling efficiency of existing polarization temperature control methods. It provides a novel polarization temperature control device applicable to the automatic polarization of all piezoelectric ceramic components. This device offers high temperature control accuracy, uniform temperature of the insulating medium, and advantages such as energy saving, reduced consumption, safety, and reliability, significantly improving equipment utilization efficiency.

[0006] This invention provides the following technical solution:

[0007] A temperature control device for a polarization apparatus includes a polarization container, a polarization clamp, an insulating medium, a heating system, a cooling system, a PLC control circuit, and a pressurization system. The heating system includes a temperature probe, a heating tube, a temperature controller, a power regulator, and an audible and visual alarm module.

[0008] The cooling system includes an external circulation pipeline, an external circulation inlet baffle, a heat transfer oil pump, an oil pump frequency converter motor, an evaporator, an external circulation filter, an evaporator fan, a digital flow meter, an external circulation outlet valve, and an external circulation inlet valve.

[0009] The heating tube is built into a polarization container, which contains an insulating medium. A polarization fixture is mounted above the polarization container. The polarization fixture includes a high-voltage electric field negative copper plate, a high-voltage electric field positive copper plate, and a high-voltage electric field negative copper probe. The high-voltage electric field negative copper plate is mounted above the high-voltage electric field positive copper plate. A piezoelectric element is mounted on the high-voltage electric field positive copper plate, and the high-voltage electric field negative copper probe is mounted on the piezoelectric element. An evaporator fan is located at the bottom of the polarization container.

[0010] Preferably, the insulating medium is silicone oil.

[0011] Preferably, one end of the temperature control probe extends into the polarization container, and the other end extends outward. The temperature control probe is electrically connected to the temperature control instrument, the power regulator, and the audible and visual alarm module. The power regulator is electrically connected to the heating tube.

[0012] Preferably, the external circulation pipelines are located on both sides of the polarization container and connected to the polarization container, with one end of the external circulation pipeline on one side having an external circulation inlet baffle.

[0013] Preferably, one end of the external circulation pipeline on one side of the polarization container is connected to an external circulation inlet valve, a digital flow meter is connected to one side of the external circulation inlet valve, a heat transfer oil pump is connected to one side of the digital flow meter, an oil pump frequency conversion motor is connected above the heat transfer oil pump, and an evaporator is connected to one side of the heat transfer oil pump.

[0014] Preferably, one end of the external circulation pipeline on the other side of the polarization container is connected to an external circulation outlet valve, one side of the external circulation outlet valve is connected to an external circulation filter, one side of the external circulation filter is connected to the evaporator, and one side of the evaporator is equipped with an evaporator fan.

[0015] Preferably, the external circulation pipeline is provided with multiple external circulation inlets and external circulation outlets on both sides of the polarization container. The external circulation inlets are all located on the bottom side of the polarization container, and the external circulation outlets are all located on the top side of the polarization container.

[0016] Preferably, the heating element is a multi-stage S-shaped heating element.

[0017] In summary, compared with the prior art, the above-described technical solutions conceived by this invention can achieve the following beneficial effects:

[0018] 1) Precisely control the heating and cooling rates of the insulating medium during polarization to reduce temperature deviations in the insulating medium and improve operational efficiency and consistency of polarization performance;

[0019] 2) Furthermore, the present invention can set the heating and cooling rates as needed according to different polarization targets, which greatly improves the applicability of the device and has obvious technical advantages compared with traditional temperature-controlled polarization processes. Attached Figure Description

[0020] Figure 1 This is a front view schematic diagram of the polarization device of the present invention in operation;

[0021] Figure 2 This is a schematic diagram of the temperature control polarization process of the temperature control device of the present invention;

[0022] Figure 3 This is a schematic diagram of the heating system of the temperature control device of the present invention;

[0023] Figure 4 This is a schematic diagram of the cooling system of the temperature control device of the present invention;

[0024] Figure 5 This is a cross-sectional view of the polarization container of the present invention;

[0025] Figure 6 This is a schematic diagram of the bottom air-cooling system of the polarization container in the cooling system of the present invention;

[0026] Figure 7 This is a schematic diagram of the combination of the heating system and the cooling system of the present invention;

[0027] Figure 8 This is a schematic diagram of the temperature control device for the original polarization equipment.

[0028] The markings in the image are as follows:

[0029] 1-Polarized container; 2-Heating tube; 3-Temperature controller; 4-Temperature probe; 5-Power regulator; 6-External circulation pipeline; 7-External circulation inlet baffle; 8-Heat transfer oil pump; 9-Oil pump variable frequency motor; 10-Evaporator; 11-External circulation filter; 12-Evaporator fan; 14-Insulating medium; 15-High voltage electric field positive electrode copper plate; 16-High voltage electric field negative electrode copper plate; 17-Piezoelectric element; 18-High voltage negative electrode copper probe; 19-External circulation inlet of medium; 20-External circulation outlet of medium; 21-Heater; 22-Side upper air-cooled electric fan; 23-Audible and visual alarm module; 24-Digital flow meter; 25-External circulation outlet valve; 26-External circulation inlet valve. Detailed Implementation

[0030] The specific embodiments of the present invention are described in detail below with reference to the accompanying drawings, so that those skilled in the art can more clearly understand how to practice the present invention. Although the present invention has been described in conjunction with its preferred embodiments, these embodiments are merely illustrative and not intended to limit the scope of the invention.

[0031] As attached Figure 8 As shown, the original polarization equipment temperature control device has a side-mounted upper-level air-cooled electric fan 22 installed on one side for cooling. The heater 21 is installed below the polarization container 1, and its heater 21 is heated by an electric furnace, infrared heating plate, or induction cooker. The original temperature control device has problems such as severely delayed temperature transfer, uneven temperature inside the polarization container, excessively long cooling time, certain safety hazards in the installation position of the air-cooled fan, and an unclean working surface.

[0032] Based on the optimization plan, and in conjunction with the attached... Figure 1-7 As shown, a temperature control device for a polarization device includes a polarization container 1, a polarization clamp, an insulating medium 14, a heating system, a cooling system, a PLC control circuit, and a pressurization system. The pressurization system is equipped with an overcurrent protection device. The heating system includes a temperature control probe 4, a heating tube 2, a temperature controller 3, a power regulator 5, and an audible and visual alarm module 23.

[0033] The cooling system includes an external circulation pipeline 6, an external circulation inlet baffle 7, a heat transfer oil pump 8, an oil pump frequency converter motor 9, an evaporator 10, an external circulation filter 11, an evaporator fan 12, a digital flow meter 24, an external circulation outlet valve 25, and an external circulation inlet valve 26.

[0034] The heating tube 2 is built into the polarization container 1, and the polarization container 1 is provided with an insulating medium 14. A polarization fixture is mounted on top of the polarization container 1. The polarization fixture includes a high-voltage electric field negative electrode copper plate 16, a high-voltage electric field positive electrode copper plate 15, and a high-voltage electric field negative electrode copper probe 18. The high-voltage electric field negative electrode copper plate 16 is mounted on top of the high-voltage electric field positive electrode copper plate 15. A piezoelectric element 17 is provided on the high-voltage electric field positive electrode copper plate 15. The high-voltage electric field negative electrode copper probe 18 is mounted on the piezoelectric element 17. An evaporator fan 12 is provided at the bottom of the polarization container 1.

[0035] Specifically, the insulating medium 14 is made of silicone oil, and the polarization container 1 has a capacity of 15L-20L. Preferably, the capacity of the polarization container 1 is 18L.

[0036] Specifically, one end of the temperature control probe 4 extends into the polarization container 1, and the other end extends outward. The temperature control probe 4 is electrically connected to the temperature control instrument 3, the power regulator 5, and the audible and visual alarm module 23. The power regulator 5 is electrically connected to the heating tube 2. When the temperature control instrument 3 is controlling the temperature, it selects the output of the temperature control instrument 3 (4~20) mA to trigger the power regulator 5 (phase shift trigger) to supply power to the heating tube 2, so that the temperature control accuracy reaches within ±1℃.

[0037] Specifically, the external circulation pipes 6 are located on both sides of the polarization container 1 and are connected to the polarization container 1. One end of the external circulation pipe 6 on one side is provided with an external circulation inlet baffle 7. Preferably, the external circulation pipe 6 is made of seamless copper pipe with a diameter of 18mm.

[0038] Specifically, one end of the external circulation pipe 6 on one side of the polarization container 1 is connected to an external circulation inlet valve 26, and a digital flow meter 24 is connected to one side of the external circulation inlet valve 26. A heat transfer oil pump 8 is connected to one side of the digital flow meter 24. Preferably, the heat transfer oil pump 8 operates at a speed of 2800 r / min, has a flow rate of 30 L / min, and a temperature resistance of 300℃. An oil pump frequency converter motor 9 is connected above the heat transfer oil pump 8, and an evaporator 10 is connected to one side of the heat transfer oil pump 8. The heat transfer oil pump 8 is installed at the outlet end of the evaporator 10, enabling... To effectively reduce the circulating operating temperature of the heat transfer oil pump 8, the evaporator 10 preferably has a size of (280×230×105) mm, and the oil pump variable frequency motor 9 preferably has a stepless speed regulation within the range of (200~940) r / min, which can control the operating flow rate of the heat transfer oil pump 8 between (2.1~10.1) L / min. The circulating flow rate of the silicone oil can be monitored in real time by a digital flow meter 24. When the silicone oil passes through the external circulation inlet baffle 7, the disturbance to the silicone oil in the polarization container 1 can be greatly reduced.

[0039] Specifically, one end of the external circulation pipe 6 on the other side of the polarization container 1 is connected to an external circulation outlet valve 25, and an external circulation filter 11 is connected to one side of the external circulation outlet valve 25. Preferably, the external circulation filter 11 is a stainless steel filter with a filtration accuracy of 40μm. One side of the external circulation filter 11 is connected to the evaporator 10, and an evaporator fan 12 is installed on one side of the evaporator 10. Preferably, the evaporator fan 12 has a voltage of 220V stepless speed regulation.

[0040] Specifically, the external circulation pipeline 6 is provided with multiple external circulation inlets 19 and external circulation outlets 20 on both sides of the polarization container 1. The external circulation inlets 19 are all located on the bottom side of the polarization container 1, and the external circulation outlets 20 are all located on the top side of the polarization container 1.

[0041] Specifically, the heating tube 2 is a multi-stage S-shaped heating tube, the power of the heating tube 2 is selected from 1.5kw to 3kw, the diameter of the heating tube 2 is 8mm to 16mm, and preferably, the power of the heating tube 2 is selected from 2kw, the material of the heating tube 2 is stainless steel, and the diameter is 12mm, so as to keep the temperature deviation of the silicone oil in the polarization container 1 less than ±1℃.

[0042] The temperature control process of the temperature control device of the present invention is described below:

[0043] The heating element 2 of the heating system is built into the polarization container 1. After the insulating medium 14 is injected, the output power of the heating element 2 is controlled by the power regulator 5. When the set temperature is approached, the power of the heating element 2 gradually decreases to achieve precise temperature control. Temperature uniformity at different locations of the insulating medium 14 is achieved by increasing the number of heating element 2 circuits. Silicone oil is preferably used as the insulating medium 14. After the required temperature is reached, the temperature controller 3 sends a signal to the PLC control circuit, and the pressurization system begins to apply voltage at the set pressurization rate. After the set maximum voltage is maintained for the set time, the cooling system starts, using the thermal oil pump 8 to pump the insulating medium 14 into the evaporator 10, and then back into the polarization container 1, achieving rapid cooling of the insulating medium 14. The cooling rate can be controlled by the flow rate of the thermal oil pump 8 and the power of the evaporator fan 12.

[0044] After the temperature of the insulating medium 14 inside the polarization container 1 drops to the set temperature, the temperature control instrument 3 sends a signal to disconnect the pressurization system. After full discharge, the piezoelectric element 17 is removed, completing the polarization process.

[0045] It should be noted that setting the external circulation inlet baffle 7 can greatly reduce the fluctuation of the liquid level of the insulating medium 14 in the polarization container 1; if a piezoelectric element 17 breaks down during the polarization process, the pressurization system will disconnect the voltage of the corresponding branch through the overcurrent protection device to ensure the continuity of the polarization process.

[0046] Specifically, the maximum polarization temperature is set at T1℃, the upper limit alarm temperature is set at (T1-0.5)℃, and the lower limit alarm temperature is set at T2 (pressure holding end temperature). During heating, when the insulating medium 14 rises from room temperature to (T1-0.5)℃, the temperature controller 3 issues an alarm, reminding the operator to start applying voltage at this time, and simultaneously sends a signal to start the pressurization system. After the heat holding and pressure holding are completed, the cooling system starts working. When the insulating medium 14 drops from T1 to below T2, the temperature controller 3 sends a signal to disconnect the voltage, and after full discharge, the piezoelectric element 17 is removed for the next batch of polarization work.

[0047] The above description is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any modifications and substitutions based on the technical solutions and inventive concepts provided by the present invention should be covered within the scope of protection of the present invention.

Claims

1. A temperature control device for a polarization apparatus, comprising a polarization container (1), a polarization clamp, an insulating medium (14), a heating system, a cooling system, a PLC control circuit, and a pressurization system, characterized in that: The heating system includes a temperature control probe (4), a heating tube (2), a temperature control instrument (3), a power regulator (5), and an audible and visual alarm module (23). The cooling system includes an external circulation pipeline (6), an external circulation inlet baffle (7), a heat transfer oil pump (8), an oil pump frequency converter motor (9), an evaporator (10), an external circulation filter (11), an evaporator fan (12), a digital flow meter (24), an external circulation outlet valve (25), and an external circulation inlet valve (26). The heating tube (2) is built into the polarization container (1), and the polarization container (1) is provided with an insulating medium (14). A polarization clamp is mounted above the polarization container (1). The polarization clamp includes a high voltage electric field negative electrode copper plate (16), a high voltage electric field positive electrode copper plate (15), and a high voltage negative electrode copper probe (18). The high voltage electric field negative electrode copper plate (16) is mounted above the high voltage electric field positive electrode copper plate (15). A piezoelectric element (17) is provided on the high voltage electric field positive electrode copper plate (15). A high voltage negative electrode copper probe (18) is mounted on the piezoelectric element (17). An evaporator fan (12) is provided at the bottom of the polarization container (1). The external circulation pipes (6) are located on both sides of the polarization container (1) and connected to the polarization container (1). One end of the external circulation pipe (6) on one side is provided with an external circulation inlet baffle (7). One end of the external circulation pipe (6) on the polarization container (1) is connected to an external circulation inlet valve (26). A digital flow meter (24) is connected to one side of the external circulation inlet valve (26). A heat transfer oil pump (8) is connected to one side of the digital flow meter (24). An oil pump frequency conversion motor (9) is connected above the heat transfer oil pump (8). An evaporator (10) is connected to one side of the heat transfer oil pump (8). One end of the external circulation pipe (6) on the other side of the polarization container (1) is connected to an external circulation outlet valve (25), and an external circulation filter (11) is connected to one side of the external circulation outlet valve (25). One side of the external circulation filter (11) is connected to the evaporator (10), and an evaporator fan (12) is installed on one side of the evaporator (10).

2. The temperature control device for a polarization apparatus according to claim 1, characterized in that: The insulating medium (14) is silicone oil.

3. The temperature control device for a polarization apparatus according to claim 1, characterized in that: One end of the temperature control probe (4) extends into the polarization container (1), and the other end extends outward. The temperature control probe (4) is electrically connected to the temperature control instrument (3), the power regulator (5), and the sound and light alarm module (23). The power regulator (5) is electrically connected to the heating tube (2).

4. The temperature control device for a polarization device according to claim 1, characterized in that: The external circulation pipeline (6) is provided with multiple external circulation inlets (19) and external circulation outlets (20) on both sides of the polarization container (1). The external circulation inlets (19) are all located on the bottom side of the polarization container (1), and the external circulation outlets (20) are all located on the top side of the polarization container (1).

5. The temperature control device for a polarization apparatus according to claim 1, characterized in that: The heating tube (2) is a multi-stage S-shaped heating tube.

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