Heat treatment device for iron core of mutual inductor

Abstract

The utility model discloses a mutual inductor iron core heat treatment device, which relates to the technical field of mutual inductor iron core production equipment, and comprises a heating box, one end of the heating box is provided with an opening, the opening is detachably connected with a sealing cover, and a ceramic fiber sealing gasket is arranged between the sealing cover and the opening. A sealing cover is arranged in the heating box, a supporting assembly is arranged between the sealing cover and the inner wall of the heating box, the supporting assembly is sleeved with a mutual inductor iron core, a spiral coil is arranged in the heating box, the two ends of the spiral coil penetrate through the heating box and are electrically connected with an externally-arranged controller, and the mutual inductor iron core is located in the spiral coil; the heating box is connected with a vacuumizing valve, an inflation valve, a pressure transmitter and an exhaust valve, and the pressure transmitter is electrically connected with the controller. According to the device, the heating speed of the iron core of the mutual inductor can be increased, and the pressure in the device cannot be too high.

Description

TECHNICAL FIELD

[0001] The utility model relates to the technical field of mutual inductor core production equipment, and particularly relates to a mutual inductor core heat treatment device. BACKGROUND

[0002] The mutual inductor core is a component in the mutual inductor, and the mutual inductor core generally undergoes the following manufacturing process: winding the strip into a core, and heating (annealing or tempering) the core for setting treatment.

[0003] The patent with the publication number CN213507103U discloses a tempering equipment for mutual inductor cores, which can be used for heating and setting the mutual inductor cores. When in use, the heating cover heats the sealing cover, the sealing cover heats the inert gas inside it, and the inert gas heats the mutual inductor core. The working mode of heating the mutual inductor core by the inert gas results in a slow heating speed of the mutual inductor core, which affects the work efficiency.

[0004] The inventor has found that the internal pressure of the sealing cover increases during the heating process, and when the internal pressure exceeds a certain value, it may exceed the limit of the sealing strip or magnetic adsorption and overcome the weight of the sealing cover, lift the sealing cover, and cause the inert gas to be discharged from the bottom opening of the sealing cover. The above phenomenon may occur multiple times during the entire heating process, causing external air to easily enter the sealing cover and causing the surface of the mutual inductor core to oxidize.

[0005] Therefore, it is necessary to develop a mutual inductor core heat treatment device to address the above-mentioned defects. UTILITY MODEL CONTENTS

[0006] The utility model aims to provide a mutual inductor core heat treatment device that can improve the heating speed of the mutual inductor core and prevent the pressure inside the device from being too high.

[0007] To solve the above technical problems, the utility model adopts the following technical solutions:

[0008] The utility model discloses a mutual inductor core heat treatment device, including the heating box, one end of the heating box is equipped with the opening, the opening is detachably connected with the cover, the cover and the opening between be provided with ceramic fiber gasket, the cover and the inner wall between the heating box are provided with support assembly, the mutual inductor core is set on the support assembly, the heating box is provided with helical coil, the both ends of the helical coil are respectively penetrated the heating box and with the controller of outside setting electric connection, the mutual inductor core is located in the helical coil;

[0009] The heating box is connected with a vacuum valve for vacuumizing the inside of the heating box, a gas filling valve for filling protective gas, a pressure transmitter for monitoring the internal pressure of the heating box and an exhaust valve for reducing the internal pressure of the heating box, and the pressure transmitter is electrically connected with the controller.

[0010] Optionally, the support assembly comprises a support rod, the plurality of transformer cores are sequentially sleeved on the support rod, a first pipe body is fixed on the cover, one end of the support rod is inserted into the first pipe body and is in interference fit, a second pipe body is fixed on the inner wall of the heating box away from the cover, and the other end of the support rod is detachably inserted into the second pipe body.

[0011] Optionally, the support assembly comprises a support rod, the plurality of transformer cores are sequentially sleeved on the support rod, a first pipe body is fixed on the cover, one end of the support rod is rotatably connected with the first pipe body; a motor is fixed on the outer wall of the heating box away from the cover, an output shaft of the motor penetrates through the heating box and is detachably connected with one end of the support rod away from the cover.

[0012] Optionally, the surface of the support rod is coated with a high-temperature insulating layer.

[0013] Optionally, a spacer made of ceramic or mica is arranged between adjacent transformer cores, and the spacer is sleeved on the support rod.

[0014] Optionally, the support rod is made of high-temperature-resistant ceramic or quartz material.

[0015] Optionally, the heating box and the cover are made of high-temperature-resistant ceramic or refractory bricks.

[0016] Optionally, the exhaust valve is an electric valve, and the electric valve is electrically connected with the controller.

[0017] Optionally, a temperature transmitter for monitoring the temperature inside the heating box is further included, and the temperature transmitter is electrically connected with the controller.

[0018] Optionally, the first pipe body is integrally formed with the heating box and is made of the same material, and the second pipe body is integrally formed with the cover and is made of the same material.

[0019] Compared with the prior art, the beneficial technical effects of the present application are as follows:

[0020] The transformer core is subjected to electromagnetic induction heating by the spiral coil, which greatly improves the heating speed and significantly improves the work efficiency, compared with the indirect heating mode by inert gas in the prior art.

[0021] The sealing between the heating box and the cover is ensured by a ceramic fiber sealing gasket, and the exhaust is performed through an exhaust valve, so that external air cannot enter the inside of the heating box during use, and oxidation of the transformer core is avoided.

[0022] In the scheme with the motor, the motor drives the support rod to rotate, and drives the transformer core to rotate at a rotation speed of 5 to 10 revolutions per minute, so that the core is heated more uniformly, and the consistency of the heat treatment effect is ensured.

[0023] The temperature transmitter monitors the temperature inside the heating box in real time, feeds back the temperature information to the controller, the controller adjusts the heating power of the spiral coil according to the temperature information, and the temperature is accurately controlled; the linkage of the pressure transmitter and the exhaust valve realizes automatic adjustment of the air pressure in the heating box, the whole device is high in intelligent degree, easy to operate, and the stability and reliability of the heat treatment process are ensured. BRIEF DESCRIPTION OF DRAWINGS

[0024] The utility model will be further described in connection with the drawings.

[0025] Figure 1 It is the front view structural schematic diagram of the utility model not having the motor;

[0026] Figure 2 It is Figure 1 The internal structure schematic diagram of the utility model not having the motor;

[0027] Figure 3 It is the internal structure schematic diagram of the utility model having the motor;

[0028] Figure 4 It is the sectional view structural schematic diagram of the support assembly.

[0029] The figure mark explanation: 100, heating box;110, cover;120, vacuumizing valve;130, inflation valve;140, pressure transmitter;150, exhaust valve;200, transformer core;300, spiral coil;400, support rod;500, motor;600, spacer;700, temperature transmitter. DETAILED DESCRIPTION

[0030] The core of the utility model is to provide a kind of transformer core heat treatment device, can improve the heating speed of transformer core and can make the pressure in device not too high.

[0031] The technical scheme in the embodiments of the utility model will be described clearly and completely in connection with the drawings in the embodiments of the utility model, apparently, the described embodiment is only a part of the embodiment of the utility model, not all the embodiment.Based on the embodiment in the utility model, all other embodiments obtained by the person skilled in the art without making creative labor belong to the range of protection of the utility model.

[0032] In the description of this utility model, it should be understood that the terms "upper", "lower", "front", "rear", "left", "right", "top", "bottom", "inner", "outer", "middle", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0033] In one specific embodiment of this utility model, such as Figures 1 to 4 As shown, the device includes a heating box 100, with an opening at one end. A cover 110 is detachably connected to the opening via bolts. A ceramic fiber sealing gasket is provided between the cover 110 and the opening. A support assembly is provided between the cover 110 and the inner wall of the heating box 100. A current transformer core 200 is fitted onto the support assembly. A spiral coil 300 is provided inside the heating box 100. Both ends of the spiral coil 300 pass through the heating box 100 and are electrically connected to an external controller. The controller can control the current magnitude and frequency of the spiral coil 300, thereby precisely controlling the heating power and realizing electromagnetic induction heating of the current transformer core 200. The current transformer core 200 is located inside the spiral coil 300.

[0034] The heating chamber 100 is equipped with a vacuum valve 120 for evacuating the interior of the heating chamber 100, an inflation valve 130 for filling with protective gas, a pressure transmitter 140 for monitoring the internal air pressure of the heating chamber 100, and an exhaust valve 150 for reducing the internal air pressure of the heating chamber 100. The pressure transmitter 140 is electrically connected to the controller.

[0035] In one specific embodiment of this utility model, such as Figure 1 , 2 As shown in Figure 4, this is the setting method of the support component in the technical solution without motor 500. The support component includes a support rod 400, multiple current transformer cores 200 are sequentially sleeved on the support rod 400, a first tube is fixed on the cover 110, one end of the support rod 400 is inserted into the first tube and interference fits, a second tube is fixed on the inner wall of the heating box 100 away from the cover 110, and the other end of the support rod 400 is detachably inserted into the second tube.

[0036] In one specific embodiment of this utility model, such as Figure 3 and 4As shown, this is the arrangement of the support assembly in the technical solution with motor 500. The support assembly includes a support rod 400, multiple current transformer cores 200 are sequentially sleeved on the support rod 400, and a first tube is fixed on the cover 110. One end of the support rod 400 is rotatably connected to the first tube. The motor 500 is fixed on the outer wall of the heating box 100 away from the cover 110. The output shaft of the motor 500 passes through the heating box 100 and is detachably connected to the end of the support rod 400 away from the cover 110. One end of the support rod 400 has a socket with a regular polygonal cross-section. The output shaft of the motor 500 matches the socket, so that the output shaft of the motor 500 can drive the support rod 400 to rotate by a snap-fit ​​and achieve a detachable connection. Compared with the previous support component setup, during the heating process, the motor 500 drives the support rod 400 to rotate, and the support rod 400 drives the current transformer core 200 to rotate. The support rod 400 rotates at a speed of 5 to 10 revolutions per minute to ensure that the current transformer core 200 is heated evenly.

[0037] In one specific embodiment of this utility model, the surface of the support rod 400 is coated with a high-temperature insulating layer. The high-temperature insulating layer is not limited to magnesium oxide or mica, and prevents the transformer core 200 from directly contacting the support rod 400, which could lead to a short circuit.

[0038] In one specific embodiment of this utility model, such as Figures 2 to 4 As shown, ceramic or mica spacers 600 are provided between adjacent transformer cores 200, and the spacers 600 are sleeved on the support rod 400. The spacers 600 prevent the transformer cores 200 from contacting each other and reduce eddy current losses.

[0039] In one specific embodiment of this utility model, the support rod 400 is made of high-temperature resistant ceramic or quartz material. High-temperature resistant ceramics such as silicon nitride, alumina, or quartz, as the material for making the support rod 400, have the characteristics of high temperature resistance, non-magnetic properties, and low coefficient of thermal expansion, thus avoiding magnetic field interference and high-temperature deformation.

[0040] In one specific embodiment of this utility model, the heating box 100 and the cover 110 are made of high-temperature resistant ceramics or refractory bricks.

[0041] In one specific embodiment of this utility model, the exhaust valve 150 is an electric valve, which is electrically connected to the controller. The pressure transmitter 140 is electrically connected to the controller and can feed back the air pressure information inside the heating chamber 100 to the controller in real time. Since the exhaust valve 150 is an electric valve and electrically connected to the controller, the controller can automatically control the opening and closing of the exhaust valve 150 based on the air pressure information fed back by the pressure transmitter 140, in order to maintain the stability of the air pressure inside the heating chamber 100 and prevent the heating chamber 100 from deforming or breaking.

[0042] In one specific embodiment of this utility model, a temperature transmitter 700 is further included for monitoring the internal temperature of the heating chamber 100. The temperature transmitter 700 is electrically connected to the controller. The temperature transmitter 700 can monitor the temperature inside the heating chamber 100 in real time and feed the temperature information back to the controller. The controller adjusts the heating power of the spiral coil 300 according to the feedback information to achieve precise temperature control.

[0043] In one specific embodiment of this utility model, the first tube body and the heating box 100 are integrally formed and made of the same material, and the second tube body and the cover 110 are integrally formed and made of the same material.

[0044] The technical solution without motor 500 is as follows: The current transformer core 200 is fitted onto the support rod 400, and adjacent current transformer cores 200 are separated by spacers 600. Then, the support rod 400 is moved by the cover 110 to insert the support rod 400 into the second tube. A ceramic fiber sealing gasket is placed between the cover 110 and the opening. Then, the cover 110 and the heating box 100 are fixed together with bolts. Vacuum valve 120 is connected to an external vacuum device to evacuate the heating chamber 100. When pressure transmitter 140 detects that the pressure inside the heating chamber 100 reaches the set vacuum level, the vacuuming is complete, and vacuum valve 120 is closed. An external protective gas supply device then fills the heating chamber 100 with nitrogen or argon gas through charging valve 130. When pressure transmitter 140 detects that the pressure inside the heating chamber 100 reaches the set value (e.g., atmospheric pressure or 0.1 to 0.8 MPa), charging is complete, and charging valve 130 is closed. The controller then energizes the spiral coil 300, thereby electromagnetically inducing heating of the transformer core 200. Temperature transmitter 700 monitors the temperature inside the heating chamber 100 in real time and feeds the temperature information back to the controller. The controller adjusts the heating power of the spiral coil 300 based on the feedback information to achieve precise temperature control. The exhaust valve 150 is an electric valve that is electrically connected to the controller. The controller can automatically control the opening and closing of the exhaust valve 150 based on the air pressure information fed back by the pressure transmitter 140, so as to maintain the stability of the air pressure inside the heating box 100.

[0045] The technical solution with motor 500 is used as follows: the current transformer core 200 is fitted onto the support rod 400, and adjacent current transformer cores 200 are separated by spacers 600. Then, the support rod 400 is inserted into the output shaft of motor 500. A ceramic fiber sealing gasket is placed between the cover 110 and the opening. The support rod 400 is inserted into the first tube body. Then, the cover 110 and the heating box 100 are fixed together with bolts. Vacuum valve 120 is connected to an external vacuum device to evacuate the heating chamber 100. When pressure transmitter 140 detects that the pressure inside the heating chamber 100 reaches the set vacuum level, the vacuuming is complete, and vacuum valve 120 is closed. An external protective gas supply device fills the heating chamber 100 with nitrogen or argon gas through charging valve 130. When pressure transmitter 140 detects that the pressure inside the heating chamber 100 reaches the set value (e.g., atmospheric pressure or 0.1 to 0.8 MPa), charging is complete, charging valve 130 is closed, and the controller energizes the spiral coil 300 to electromagnetically heat the transformer core 200. During heating, motor 500 drives support rod 400 to rotate, which in turn drives the transformer core 200 to rotate at a speed of 5 to 10 revolutions per minute, ensuring uniform heating of the transformer core 200. The temperature transmitter 700 can monitor the temperature inside the heating chamber 100 in real time and feed the temperature information back to the controller. The controller adjusts the heating power of the spiral coil 300 according to the feedback information to achieve precise temperature control. The exhaust valve 150 is an electric valve and is electrically connected to the controller. The controller can automatically control the opening and closing of the exhaust valve 150 according to the air pressure information fed back by the pressure transmitter 140 to maintain the stability of the air pressure inside the heating chamber 100.

[0046] The various embodiments in this specification are described in a progressive manner, with each embodiment focusing on its differences from other embodiments. Similar or identical parts between embodiments can be referred to interchangeably, and the embodiments can be combined with each other. For the apparatus disclosed in the embodiments, since it corresponds to the method disclosed in the embodiments, the description is relatively simple; relevant parts can be referred to in the method section.

[0047] The above embodiments are merely preferred embodiments of the present utility model and are not intended to limit the scope of the present utility model. Various modifications and improvements made by those skilled in the art to the technical solutions of the present utility model without departing from the spirit of the present utility model should fall within the protection scope defined by the claims of the present utility model.

Claims

1. A heat treatment device for a current transformer core, characterized in that, The device includes a heating box (100), one end of which has an opening. A cover (110) is detachably connected to the opening. A ceramic fiber sealing gasket is provided between the cover (110) and the opening. A support assembly is provided between the cover (110) and the inner wall of the heating box (100). A current transformer core (200) is sleeved on the support assembly. A spiral coil (300) is provided inside the heating box (100). Both ends of the spiral coil (300) pass through the heating box (100) and are electrically connected to an external controller. The current transformer core (200) is located inside the spiral coil (300). The heating chamber (100) is equipped with a vacuum valve (120) for evacuating the heating chamber (100), an inflation valve (130) for filling with protective gas, a pressure transmitter (140) for monitoring the internal air pressure of the heating chamber (100), and an exhaust valve (150) for reducing the internal air pressure of the heating chamber (100). The pressure transmitter (140) is electrically connected to the controller.

2. The transformer core heat treatment device according to claim 1, characterized in that: The support assembly includes a support rod (400), a plurality of current transformer cores (200) are sequentially sleeved on the support rod (400), a first tube is fixed on the cover (110), one end of the support rod (400) is inserted into the first tube and interference fits, a second tube is fixed on the inner wall of the heating box (100) away from the cover (110), and the other end of the support rod (400) is detachably inserted into the second tube.

3. The transformer core heat treatment device according to claim 2, characterized in that: The support assembly includes a support rod (400), and a plurality of current transformer cores (200) are sequentially sleeved on the support rod (400). A first tube is fixed on the cover (110), and one end of the support rod (400) is rotatably connected to the first tube. A motor (500) is fixed on the outer wall of the heating box (100) away from the cover (110). The output shaft of the motor (500) passes through the heating box (100) and is detachably connected to one end of the support rod (400) away from the cover (110).

4. The transformer core heat treatment apparatus according to claim 2 or 3, characterized in that: The surface of the support rod (400) is coated with a high-temperature insulating layer.

5. The transformer core heat treatment apparatus according to claim 2 or 3, characterized in that: A ceramic or mica spacer (600) is provided between adjacent current transformer cores (200), and the spacer (600) is sleeved on the support rod (400).

6. The transformer core heat treatment apparatus according to claim 2 or 3, characterized in that: The support rod is made of high-temperature resistant ceramic or quartz material.

7. The transformer core heat treatment apparatus according to claim 1, characterized in that: The heating box (100) and the cover (110) are made of high-temperature resistant ceramics or refractory bricks.

8. The transformer core heat treatment apparatus according to claim 1, characterized in that: The exhaust valve (150) is an electric valve, and the electric valve is electrically connected to the controller.

9. The transformer core heat treatment apparatus according to claim 1, characterized in that: It also includes a temperature transmitter (700) for monitoring the internal temperature of the heating chamber (100), the temperature transmitter (700) being electrically connected to the controller.

10. The transformer core heat treatment apparatus according to claim 2, characterized in that: The first tube body is integrally formed with the heating box (100) and made of the same material, and the second tube body is integrally formed with the cover (110) and made of the same material.

Images