A fast-response solid-state relay

Abstract

The present invention relates to the technical field of solid-state relays, and discloses a fast-response solid-state relay, comprising a housing, a circuit board module, a heat sink and a fan are fixedly installed inside the housing, an installation cavity is opened inside the housing, a movable disk is slidably installed in the installation cavity, a connecting spring for suspending the movable disk is arranged in the installation cavity, a connecting shaft is fixedly installed at the lower end of the movable disk, a fixed sleeve is fixedly installed at the bottom end of the connecting shaft, a first coil and a second coil are respectively embedded inside the fixed sleeve, an iron ring is fixedly installed in the installation cavity, and the connecting shaft passes through the iron ring. The present invention controls the on-off of two first terminals through signals from four second terminals, and the four second terminals receive feedback signals of temperature and load, and execute the action of cutting off the high-voltage circuit in a manner of sliding the movable disk up and down, so as to meet the use requirement that the input end of the solid-state relay drives a large current load with a tiny control signal, and achieve the effect of fast response at the same time.

Description

Technical Field

[0001] The present invention relates to the technical field of solid-state relays, and in particular to a fast-response solid-state relay. Background Art

[0002] A solid-state relay is a contactless switch composed of a microelectronic circuit, discrete electronic devices, and power electronic power devices. The input end of the solid-state relay uses a tiny control signal to directly drive a large current load. The load current is large and easily causes high temperature. In order to solve the heat dissipation problem, in the prior art, a patent document with a publication number of CN112309767B discloses a solid-state relay with integrated heat dissipation, including a circuit board and a thyristor, and also includes a heat dissipation support plate, a heat sink and a cover. The heat sink is arranged on the heat dissipation support plate, and the cover is arranged on the heat dissipation support plate through a connecting piece. The side wall of the cover and the side wall of the heat dissipation support plate form an installation cavity. The thyristor is located in the installation cavity and connected to the heat dissipation support plate. The circuit board is arranged on the heat dissipation support plate and located in the installation cavity. The heat dissipation structure in this application is integrated with the thyristor and circuit board of the relay, and the assembly is more convenient and quick.

[0003] There are two main reasons for the heating of solid-state relays. On the one hand, it is due to the poor heat dissipation of the solid-state relay itself. On the other hand, it is due to changes in the load end, which causes current fluctuations in the load circuit, resulting in a large amount of electrical energy being converted into heat energy, seriously affecting the operating stability and safety of the solid-state relay. Existing solid-state relays are inconvenient to process temperature and load feedback signals, resulting in slow response speed. Summary of the invention

[0004] The purpose of the present invention is to solve the problem that the existing solid-state relays are inconvenient to process temperature and load feedback signals, resulting in slow response speed, and to propose a fast-response solid-state relay.

[0005] In order to achieve the above-mentioned purpose, the present invention adopts the following technical scheme: a fast-response solid-state relay, comprising a shell, in which a circuit board module, a heat sink and a fan are fixedly installed respectively, an installation cavity is opened inside the shell, a movable disk is slidably installed in the installation cavity, a connecting spring for suspending the movable disk is arranged in the installation cavity, a connecting shaft is fixedly installed at the lower end of the movable disk, a fixed sleeve is fixedly installed at the bottom end of the connecting shaft, a first coil and a second coil are respectively embedded in the interior of the fixed sleeve, an iron ring is fixedly installed in the installation cavity, and the connecting shaft passes through the iron ring.

[0006] The surface of the movable disk is fixedly mounted with a first electrode ring, a second electrode ring and a plurality of electrode sheets arranged in a ring shape, a first movable terminal and a second movable terminal are elastically and movably mounted inside the mounting cavity, and both the first movable terminal and the second movable terminal are in sliding contact with the surface of the movable disk, a rotating column is rotatably mounted in the mounting cavity, a plurality of first magnetic blocks are embedded on the surface of the rotating column, a fixed sleeve is sleeved on the surface of the rotating column, and the fan drives the rotating column to rotate synchronously through a transmission assembly.

[0007] Two first wiring terminals of the high-voltage circuit and four second wiring terminals of the low-voltage circuit are respectively installed on the surface of the shell. The on and off of the two first wiring terminals are controlled by signals from the four second wiring terminals. The four second wiring terminals receive feedback signals of temperature and load, so that the solid-state relay can identify the temperature and load feedback signals and protect the operation safety of the load end.

[0008] Preferably, the second connection terminals of the four low-voltage circuits include a first terminal, a second terminal, a third terminal and a fourth terminal, the two electrodes of the fan are electrically connected to the first terminal and the second terminal respectively, the two electrodes of the input circuit board module are electrically connected to the first terminal and the second active terminal respectively, and the first active terminal is electrically connected to the second terminal.

[0009] The movable disk is embedded with an adjustable resistor, which includes a plurality of resistance wires with different resistance values, the plurality of resistance wires are radially arranged, the ends of the plurality of resistance wires facing the axis of the movable disk are electrically connected to the second electrode ring, and the ends of the plurality of resistance wires away from the axis of the movable disk are electrically connected to each electrode sheet.

[0010] A thermistor is fixedly mounted on the surface of the heat sink. The thermistor, the first coil and the second coil are connected in series to form a detection circuit. Two ends of the detection circuit are electrically connected to the first movable terminal and the second movable terminal respectively.

[0011] Preferably, a magnetic sleeve is fixedly mounted on the upper end of the movable disk, a third coil is fixedly mounted in the mounting cavity, the third coil is arranged outside the magnetic sleeve, and electrodes at both ends of the third coil are electrically connected to the third terminal and the fourth terminal respectively.

[0012] The solid-state relay also includes an end detection component, which includes a fixed ring and a rotating ring. A fourth coil is embedded in the fixed ring, and a plurality of second magnetic blocks are embedded on the surface of the rotating ring. The end detection component is installed on the load device. The end detection component can monitor changes in the load and provide feedback signals for the solid-state relay.

[0013] Preferably, a threaded hole is provided on the upper surface of the shell, and an adjusting screw is threadedly installed in the threaded hole, the bottom end of the adjusting screw is a hexagonal structure, the top end of the magnetic sleeve is provided with a hexagonal hole, the connecting spring is arranged in the magnetic sleeve, the bottom end of the hexagonal structure of the adjusting screw is slidably inserted in the hexagonal hole, and the bottom end of the adjusting screw is rotatably connected to the top end of the connecting spring, and the adjusting screw can be rotated to adjust the resistance value of the movable disk.

[0014] Preferably, an air inlet cavity and a heat dissipation cavity connected to the outside are opened inside the shell, the heat sink is fixedly installed in the heat dissipation cavity, the fan is fixedly installed in the air inlet cavity, and the air outlet end of the fan faces the heat sink, and a hexagonal shaft is fixedly installed on the rotating end of the fan, and the fan box heat sink blows air to accelerate the heat dissipation of the heat sink.

[0015] Preferably, the transmission assembly includes a first synchronous wheel and a second synchronous wheel rotatably installed in the shell, the first synchronous wheel and the second synchronous wheel are driven by a synchronous belt, an insertion hole is opened at the bottom end of the first synchronous wheel, the hexagonal shaft is slidably inserted in the insertion hole of the first synchronous wheel, and the rotating column is fixedly installed at the upper end of the second synchronous wheel, so that the fan drives the rotating column to rotate synchronously through the transmission assembly.

[0016] The present invention has the following beneficial effects:

[0017] 1. The solid-state relay proposed in the present invention controls the on and off of the two first terminals through the signals of the four second terminals, and the four second terminals receive feedback signals of temperature and load, that is, when the internal temperature of the solid-state relay is too high or the load end is overloaded, the high-voltage circuit is cut off by sliding the movable disk up and down, which meets the use requirement of the input end of the solid-state relay to drive a large current load with a tiny control signal, and achieves a fast response effect.

[0018] 2. The solid-state relay proposed in the present invention, when operating normally, the first movable terminal and the second movable terminal realize circuit conduction by contacting with the first electrode ring. At this time, a control signal is introduced to the first terminal and the second terminal to realize the passage of the two first wiring terminals;

[0019] During normal operation, if the internal temperature of the solid-state relay suddenly rises, or the load is overloaded, even if the control signals of the first terminal and the second terminal are not cut off, the solid-state relay performs the upward movement of the movable disk, so that the first movable terminal and the second movable terminal are in an open circuit state, thereby cutting off the passage of the two first wiring terminals. When the internal temperature of the solid-state relay drops, or the load returns to normal, the movable disk resets, so that the first movable terminal and the second movable terminal are automatically turned on, and the two first wiring terminals are turned on, which has the function of real-time detection of the internal temperature and load changes of the fixed relay;

[0020] When the fixed relay is started, if the fan does not start normally, the two first terminals are connected in a short time, and then the solid-state relay performs the downward movement of the movable disk, so that the first movable terminal and the second movable terminal are in an open-circuit state, thereby cutting off the passage of the two first terminals. It has the function of startup self-check, avoids high temperature burning of the relay, and is safer to use.

[0021] 3. The solid-state relay proposed in the present invention is provided with a floating movable disk. When the power is turned on and the solid-state relay is operated normally, the upper end of the movable disk is subjected to the downward pressure (F pressure) of the connecting spring and the third coil, and the movable disk is subjected to the upward magnetic thrust (F magnetism) of the second coil. F combination and F magnetism reach a dynamic balance state. When the fan speed fluctuates, the load end speed fluctuates, or the heat sink temperature fluctuates, the size of F combination and F magnetism also changes accordingly, that is, F combination ≠ F magnetism. At this time, the movable disk moves upward or downward to achieve the effect of cutting off the circuit of the first movable terminal and the second movable terminal until the fan speed, the load end speed, or the heat sink temperature returns to the preset range, and the movable disk is reset to achieve the conduction of the circuit of the first movable terminal and the second movable terminal, that is, the function of real-time detection of the internal temperature and load changes of the fixed relay is realized, and the safety is higher.

[0022] It should be noted that since the up and down movement of the movable disk is a dynamic and gradual process, the displacement of the movable disk is linearly related to the fan speed, load end speed, and heat sink temperature change, and has the characteristics of fast response speed and quietness.

[0023] 4. The solid-state relay proposed in the present invention sets an adjustable resistor in the movable disk. When the adjusting screw is rotated, the adjusting screw presses down or stretches the connecting spring, and the elastic force of the connecting spring can be adjusted. The movable disk rotates to different angles with the adjusting screw, and the second movable terminal contacts different electrode sheets, which can change the resistance between the first movable terminal and the second movable terminal, so that the size of Fcombination and Fmagnetic can be adjusted, and differential adjustment can be performed according to usage requirements to meet the control requirements of different load circuits. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 A schematic diagram of the three-dimensional structure of the solid-state relay proposed by the present invention;

[0025] Figure 2 This is a schematic diagram of the front cross-section structure of the solid-state relay proposed by the present invention;

[0026] Figure 3 A schematic diagram of the three-dimensional structure of the movable disk proposed by the present invention (I);

[0027] Figure 4 Schematic diagram of the three-dimensional structure of the movable disk proposed by the present invention (II);

[0028] Figure 5 for Figure 2A magnified schematic diagram of the local structure;

[0029] Figure 6 A wiring diagram of four second wiring terminals proposed by the present invention;

[0030] Figure 7 This is a schematic diagram of the front cross-section structure of the fixing ring proposed by the present invention;

[0031] Figure 8 The schematic diagram of the solid-state relay circuit proposed by the present invention (I);

[0032] Fig. 9 The schematic diagram of the solid-state relay circuit proposed by the present invention (II);

[0033] Fig.10 A schematic diagram of a solid-state relay circuit proposed in the present invention (III);

[0034] Fig.11 This is a schematic diagram of the solid-state relay circuit proposed in the present invention (IV).

[0035] In the figure: 1 housing, 2 circuit board module, 3 heat sink, 4 fan, 5 movable disk, 6 connecting spring, 7 connecting shaft, 8 fixed sleeve, 9 first coil, 10 second coil, 11 iron ring, 12 first electrode ring, 13 second electrode ring, 14 electrode sheet, 15 first movable terminal, 16 second movable terminal, 17 rotating column, 18 first magnetic block, 19 first wiring terminal, 20 second wiring terminal, 201 first terminal, 202 second terminal, 203 third terminal, 204 fourth terminal, 21 adjustable resistor, 22 thermistor, 23 magnetic sleeve, 24 third coil, 25 adjusting screw, 26 fixed ring, 27 rotating ring, 28 fourth coil, 29 second magnetic block, 30 first synchronous wheel, 31 second synchronous wheel, 32 rotating shaft of load motor. DETAILED DESCRIPTION

[0036] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments.

[0037] In the description of the present invention, it is necessary to understand that the terms "upper", "lower", "front", "back", "left", "right", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship are based on the orientation or position relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0038] Reference Figure 1-11A fast-response solid-state relay comprises a housing 1, a circuit board module 2, a heat sink 3 and a fan 4 are fixedly installed inside the housing 1, an installation cavity is opened inside the housing 1, a movable disk 5 that can float up and down is slidably installed in the installation cavity, a connecting spring 6 for suspending the movable disk 5 is arranged in the installation cavity, a connecting shaft 7 is fixedly installed at the lower end of the movable disk 5, a fixing sleeve 8 is fixedly installed at the bottom end of the connecting shaft 7, a first coil 9 and a second coil 10 are respectively embedded inside the fixing sleeve 8, an iron ring 11 is fixedly installed in the installation cavity, and the connecting shaft 7 passes through the iron ring 11, for specific reference Figure 5 .

[0039] refer to Figure 2 , Figure 3 , Figure 4 A first electrode ring 12, a second electrode ring 13 and a plurality of electrode sheets 14 arranged in a ring shape are fixedly mounted on the surface of the movable disk 5, a first movable terminal 15 and a second movable terminal 16 are elastically and movably mounted inside the mounting cavity, and both the first movable terminal 15 and the second movable terminal 16 are in sliding contact with the surface of the movable disk 5, an adjustable resistor 21 is embedded in the movable disk 5, the adjustable resistor 21 comprises a plurality of resistance wires with different resistance values, the plurality of resistance wires are radially arranged, the ends of the plurality of resistance wires facing the axis of the movable disk 5 are electrically connected to the second electrode ring 13, and the ends of the plurality of resistance wires away from the axis of the movable disk 5 are electrically connected to each electrode sheet 14 respectively.

[0040] When the movable disk 5 floats up and down, the first movable terminal 15 and the second movable terminal 16 are connected through the first electrode ring 12, or the first movable terminal 15 contacts the first electrode ring 12 and the second electrode ring 13 at the same time. At this time, the second movable terminal 16 contacts one of the electrode sheets 14, that is, the first movable terminal 15 and the second movable terminal 16 are connected through the first electrode ring 12, the second electrode ring 13 and the electrode sheet 14.

[0041] refer to Figure 2 A rotating column 17 is rotatably installed in the installation cavity, a plurality of first magnetic blocks 18 are embedded on the surface of the rotating column 17, a fixed sleeve 8 is sleeved on the surface of the rotating column 17, and the fan 4 drives the rotating column 17 to rotate synchronously through the transmission assembly, such as Figure 6 As shown, when the rotating column 17 rotates, the first coil 9 cuts the magnetic field of the first magnetic block 18 to generate an alternating current signal, and the magnitude of the current is positively correlated with the rotation speed of the rotating column 17.

[0042] refer to Figure 2The shell 1 is provided with an air inlet cavity and a heat dissipation cavity connected to the outside, the heat sink 3 is fixedly installed in the heat dissipation cavity, the fan 4 is fixedly installed in the air inlet cavity, and the air outlet end of the fan 4 faces the heat sink 3, and the rotating end of the fan 4 is fixedly installed with a hexagonal shaft. The transmission assembly includes a first synchronous wheel 30 and a second synchronous wheel 31 rotatably installed in the shell 1. The first synchronous wheel 30 and the second synchronous wheel 31 are driven by a synchronous belt. The bottom end of the first synchronous wheel 30 is provided with an insertion hole, and the hexagonal shaft is slidably inserted in the insertion hole of the first synchronous wheel 30. The rotating column 17 is fixedly installed on the upper end of the second synchronous wheel 31.

[0043] like Figure 1 As shown, two first wiring terminals 19 for high-voltage circuits and four second wiring terminals 20 for low-voltage circuits are respectively installed on the surface of the housing 1 , wherein the four second wiring terminals 20 for low-voltage circuits include a first terminal 201 , a second terminal 202 , a third terminal 203 and a fourth terminal 204 .

[0044] refer to Figure 6 The two electrodes of the fan 4 are electrically connected to the first terminal 201 and the second terminal 202 respectively, the two electrodes of the input circuit of the circuit board module 2 are electrically connected to the first terminal 201 and the second active terminal 16 respectively, and the first active terminal 15 is electrically connected to the second terminal 202.

[0045] A thermistor 22 is fixedly mounted on the surface of the heat sink 3. The thermistor 22, the first coil 9 and the second coil 10 are connected in series to form a detection circuit. The two ends of the detection circuit are electrically connected to the first movable terminal 15 and the second movable terminal 16 respectively. It should be noted that a rectifier circuit is arranged between the first coil 9 and the second coil 10 to convert the alternating current generated by the first coil 9 into direct current and introduce it into the second coil 10. The second coil 10 is energized to generate a magnetic attraction force that is attracted to the iron ring 11. The magnetic attraction force provides an upward force F0 for the movable disk 5. The rectifier circuit is common knowledge in the electrical field and will not be elaborated here.

[0046] In this embodiment, a magnetic sleeve 23 is fixedly installed on the upper end of the movable disk 5, and a third coil 24 is fixedly installed in the installation cavity. The third coil 24 is arranged on the outside of the magnetic sleeve 23, and the electrodes at both ends of the third coil 24 are electrically connected to the third terminal 203 and the fourth terminal 204 respectively.

[0047] A threaded hole is provided on the upper surface of the shell 1, and an adjusting screw 25 is threadedly installed in the threaded hole. The bottom end of the adjusting screw 25 is a hexagonal structure, and a hexagonal hole is provided at the top of the magnetic sleeve 23. The connecting spring 6 is arranged in the magnetic sleeve 23. The bottom end of the hexagonal structure of the adjusting screw 25 is slidably inserted in the hexagonal hole, and the bottom end of the adjusting screw 25 is rotatably connected to the top end of the connecting spring 6, and the bottom end of the connecting spring 6 is fixedly connected to the upper surface of the movable disk 5. When the movable disk 5 moves downward, the connecting spring 6 is stretched, and when the movable disk 5 moves upward, the connecting spring 6 is compressed.

[0048] It should be noted that the circuit board module 2 includes an input circuit, a photocoupler and an output circuit. Figure 8 , 9 As shown in FIGS. 10 and 11 , the circuit board module 2 belongs to the conventional setting of the existing solid-state relay and will not be described in detail here.

[0049] In this embodiment, Figure 7 As shown, the solid-state relay proposed in the present invention also includes an end detection component, which includes a fixed ring 26 and a rotating ring 27. A fourth coil 28 is embedded in the fixed ring 26, and a plurality of second magnetic blocks 29 are embedded on the surface of the rotating ring 27. Taking the solid-state relay proposed in the present invention to control the rotation of the load motor as an example, the end detection component is assembled with the load motor, that is, the rotating ring 27 is fixedly mounted on the rotating shaft 32 of the load motor, and the fixed ring 26 is fixedly mounted on the housing of the load motor. It should be noted that during the rotation of the rotating ring 27, the fourth coil 28 cuts the magnetic field of the second magnetic block 29 to generate an alternating current signal, which is converted into a direct current signal I1 through a rectifier circuit. The fourth coil 28 is electrically connected to the third terminal 203 and the fourth terminal 204, and I1 is introduced into the third terminal 203 and the fourth terminal 204. Figure 6 As shown, the third coil 24 is energized to generate an electromagnetic field, and the electromagnetic field generates a magnetic repulsion force with the magnetic sleeve 23, providing a downward pressing force F1 for the movable disk 5.

[0050] Working principle: In summary, the lower side of the movable disk 5 is subjected to the force F0 of the second coil 10, the upper side of the movable disk 5 is subjected to the force F1 of the third coil 24, and the force F of the connecting spring 6 (F refers to the tension or pressure on the movable disk 5);

[0051] refer to Figure 8 , the first terminal 201 and the second terminal 202 introduce the control signal I0, the fan 4 starts, the first active terminal 15 and the second active terminal 16 realize circuit conduction through the first electrode ring 12 and the adjustable resistor 21, and the two first connecting terminals 19 are connected. At this time, F0=F1+F;

[0052] If the temperature of the heat sink 3 is too high, the thermistor 22 is affected by the high temperature, and the resistance of the thermistor 22 decreases. At this time, the current flowing through the second coil 10 increases, that is, F0 increases, the movable disk 5 moves up, and the first movable terminal 15 and the second movable terminal 16 are separated from the first electrode ring 12 (such as Fig. 9 As shown in the figure, the input signal of the circuit board module 2 is cut off, the two first wiring terminals 19 are in an open circuit state, the load motor stops, and the fan 4 continues to operate to maintain heat dissipation. When the temperature of the heat sink 3 drops, the resistance of the thermistor 22 increases, F0 decreases, the movable disk 5 moves down, the first movable terminal 15 and the second movable terminal 16 contact the first electrode ring 12, the input signal of the circuit board module 2 is restored, the two first wiring terminals 19 are turned on again, and the load motor starts;

[0053] When the load motor is overloaded, the speed of the shaft 32 of the load motor decreases. At this time, a large amount of electrical energy is converted into heat energy. In severe cases, the load motor and the circuit board module 2 will be burned. At this time, the speed of the shaft 32 of the load motor decreases, the DC signal I1 decreases, F1 decreases, F0>F1+F, and the movable disk 5 moves up. Fig.10 As shown, the second movable terminal 16 is separated from the electrode sheet 14, the input signal of the circuit board module 2 is cut off, the two first wiring terminals 19 are in an open circuit state, and the load motor stops. Because F0 always exists, the load motor will not restart, and manual intervention is required to eliminate the fault;

[0054] When the fan 4 fails to start, the first terminal 201 and the second terminal 202 introduce the control signal I0, and the two first terminals 19 are connected. However, at this time, the first coil 9 has no induced current, F0=0, F0<F1+F, and the movable plate 5 moves down. Fig.11 As shown, the first movable terminal 15 is separated from the first electrode ring 12, the input signal of the circuit board module 2 is cut off, the two first connecting terminals 19 are converted into an open circuit state, and the load motor is stopped.

[0055] The solid-state relay proposed in the present invention is provided with a floating movable disk 5. When the power is turned on and the solid-state relay is operated normally, the upper end of the movable disk 5 is subjected to the downward pressure (F pressure = F1 + F spring) of the connecting spring 6 and the third coil 24, and the movable disk 5 is subjected to the upward magnetic thrust (F magnetism = F0) of the second coil 10. F combination and F magnetism reach a dynamic balance state. When the speed of the fan 4 fluctuates, the speed of the load motor fluctuates, or the temperature of the heat sink 3 fluctuates, the size of F combination and F magnetism also changes accordingly, that is, F combination ≠ F magnetism. At this time, the movable disk 5 moves upward or downward to achieve the effect of cutting off the circuit of the first movable terminal 15 and the second movable terminal 16, until the speed of the fan 4, the speed of the load motor or the temperature of the heat sink 3 returns to the preset range, the movable disk 5 is reset, and the circuit of the first movable terminal 15 and the second movable terminal 16 is turned on, that is, the function of real-time detection of the internal temperature and load changes of the fixed relay is realized, and the safety is higher.

[0056] It should be noted that since the up and down movement of the movable disk 5 is a dynamic and gradual process, the displacement of the movable disk 5 is linearly related to the speed of the fan 4, the speed of the load motor, and the temperature change of the heat sink 3, and has the characteristics of fast response speed and quietness.

[0057] By setting an adjustable resistor 21 in the movable disk 5, when the adjusting screw 25 is rotated, the adjusting screw 25 presses down or stretches the connecting spring 6, and the elastic force of the connecting spring 6 can be adjusted. The movable disk 5 rotates to different angles with the adjusting screw 25, and the second movable terminal 16 contacts different electrode sheets 14, which can change the resistance value between the first movable terminal 15 and the second movable terminal 16, so that the size of Fcombination and Fmagnetic can be adjusted, and differentiated adjustments can be made according to usage requirements to meet the control requirements of different load circuits.

[0058] The solid-state relay proposed in the present invention controls the on and off of the two first terminals 19 through the signals of the four second terminals 20. The four second terminals 20 receive feedback signals of temperature and load. That is, when the internal temperature of the solid-state relay is too high or the load end is overloaded, the movable disk 5 slides up and down to cut off the high-voltage circuit, thereby meeting the use requirement of the input end of the solid-state relay to drive a large current load with a tiny control signal, and achieving a fast response effect.

[0059] Specifically, during normal operation, the first movable terminal 15 and the second movable terminal 16 are in contact with the first electrode ring 12 to achieve circuit conduction. At this time, a control signal is introduced to the first terminal 201 and the second terminal 202 to achieve a passage of the two first wiring terminals 19.

[0060] During normal operation, if the internal temperature of the solid-state relay suddenly rises, or the load is overloaded, even if the control signals of the first terminal 201 and the second terminal 202 are not cut off, the solid-state relay performs the upward movement of the movable disk 5, so that the first movable terminal 15 and the second movable terminal 16 are in an open circuit state, thereby cutting off the passage of the two first wiring terminals 19. When the internal temperature of the solid-state relay drops, or the load returns to normal, the movable disk 5 resets, so that the first movable terminal 15 and the second movable terminal 16 are automatically turned on, and the two first wiring terminals 19 are turned on, which has the function of real-time detection of the internal temperature and load changes of the fixed relay;

[0061] When the fixed relay is started, if the fan 4 does not start normally, the two first terminals 19 are turned on for a short time, and then the solid-state relay executes the downward movement of the movable disk 5, so that the first movable terminal 15 and the second movable terminal 16 are in an open-circuit state, thereby cutting off the passage of the two first terminals 19. It has the function of starting self-check, avoids high temperature burning of the relay, and is safer to use.

[0062] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical scheme and inventive concept of the present invention within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A fast-response solid-state relay, comprising a housing (1), wherein a circuit board module (2), a heat sink (3) and a fan (4) are respectively fixedly mounted inside the housing (1), and characterized in that: The housing (1) has an installation cavity formed inside, a movable disk (5) is slidably mounted inside the installation cavity, a connecting spring (6) for suspending the movable disk (5) is arranged inside the installation cavity, a connecting shaft (7) is fixedly mounted on the lower end of the movable disk (5), a fixing sleeve (8) is fixedly mounted on the bottom end of the connecting shaft (7), a first coil (9) and a second coil (10) are respectively embedded inside the fixing sleeve (8), an iron ring (11) is fixedly mounted inside the installation cavity, and the connecting shaft (7) passes through the iron ring (11); The surface of the movable disk (5) is fixedly mounted with a first electrode ring (12), a second electrode ring (13) and a plurality of electrode sheets (14) arranged in a ring shape; a first movable terminal (15) and a second movable terminal (16) are elastically and movably mounted inside the mounting cavity, and both the first movable terminal (15) and the second movable terminal (16) are in sliding contact with the surface of the movable disk (5); a rotating column (17) is rotatably mounted inside the mounting cavity, a plurality of first magnetic blocks (18) are embedded on the surface of the rotating column (17); a fixed sleeve (8) is sleeved on the surface of the rotating column (17); and the fan (4) drives the rotating column (17) to rotate synchronously via a transmission assembly; Two first wiring terminals (19) for high-voltage circuits and four second wiring terminals (20) for low-voltage circuits are respectively mounted on the surface of the housing (1).

2. A fast-response solid-state relay according to claim 1, characterized in that: The second connection terminals (20) of the four low-voltage circuits include a first terminal (201), a second terminal (202), a third terminal (203) and a fourth terminal (204); two electrodes of the fan (4) are electrically connected to the first terminal (201) and the second terminal (202), respectively; two electrodes of the input circuit of the circuit board module (2) are electrically connected to the first terminal (201) and the second movable terminal (16), respectively; and the first movable terminal (15) is electrically connected to the second terminal (202).

3. A fast-response solid-state relay according to claim 2, characterized in that: The movable disk (5) is embedded with an adjustable resistor (21), the adjustable resistor (21) comprising a plurality of resistance wires with different resistance values, the plurality of resistance wires being arranged radially, the ends of the plurality of resistance wires facing the axis of the movable disk (5) being electrically connected to the second electrode ring (13), and the ends of the plurality of resistance wires away from the axis of the movable disk (5) being electrically connected to the respective electrode sheets (14).

4. A fast-response solid-state relay according to claim 3, characterized in that: A thermistor (22) is fixedly mounted on the surface of the heat sink (3); the thermistor (22), the first coil (9) and the second coil (10) are connected in series to form a detection circuit; and two ends of the detection circuit are electrically connected to the first movable terminal (15) and the second movable terminal (16), respectively.

5. A fast-response solid-state relay according to claim 4, characterized in that: A magnetic sleeve (23) is fixedly mounted on the upper end of the movable disk (5), a third coil (24) is fixedly mounted in the mounting cavity, the third coil (24) is arranged outside the magnetic sleeve (23), and electrodes at both ends of the third coil (24) are electrically connected to a third terminal (203) and a fourth terminal (204), respectively.

6. A fast-response solid-state relay according to claim 5, characterized in that: A threaded hole is provided on the upper surface of the housing (1), and an adjusting screw (25) is threadedly installed in the threaded hole. The bottom end of the adjusting screw (25) is a hexagonal structure. The top end of the magnetic sleeve (23) is provided with a hexagonal hole. The connecting spring (6) is arranged in the magnetic sleeve (23). The bottom end of the hexagonal structure of the adjusting screw (25) is slidably inserted in the hexagonal hole, and the bottom end of the adjusting screw (25) is rotatably connected to the top end of the connecting spring (6).

7. A fast-response solid-state relay according to claim 6, characterized in that: The solid-state relay further comprises an end detection component, which comprises a fixed ring (26) and a rotating ring (27), a fourth coil (28) being embedded in the fixed ring (26), and a plurality of second magnetic blocks (29) being embedded on the surface of the rotating ring (27).

8. A fast-response solid-state relay according to any one of claims 1 to 7, characterized in that: The shell (1) is provided with an air inlet cavity and a heat dissipation cavity which are connected to the outside, the heat dissipation fin (3) is fixedly mounted in the heat dissipation cavity, the fan (4) is fixedly mounted in the air inlet cavity, and the air outlet end of the fan (4) faces the heat dissipation fin (3), and a hexagonal shaft is fixedly mounted on the rotating end of the fan (4).

9. A fast-response solid-state relay according to claim 8, characterized in that: The transmission assembly comprises a first synchronous wheel (30) and a second synchronous wheel (31) rotatably mounted in a housing (1); the first synchronous wheel (30) and the second synchronous wheel (31) are driven by a synchronous belt; an insertion hole is provided at the bottom end of the first synchronous wheel (30); the hexagonal shaft is slidably inserted in the insertion hole of the first synchronous wheel (30); and the rotating column (17) is fixedly mounted on the upper end of the second synchronous wheel (31).

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