Safety protection loop of speed regulator
By introducing redundant power-loss shutdown solenoid valve and energy storage capacitor design into the speed controller safety protection circuit, the problem of low reliability of power-loss shutdown solenoid valve is solved, and the safety and reliability of the speed controller system is improved.
Patent Information
- Application Number
- CN202422356244.5
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-09-25
- Publication Date
- 2025-07-25
- Estimated Expiration
- 2034-09-25
AI Technical Summary
In the existing speed controller safety protection circuit, the power-loss shutdown solenoid valve has low reliability, which is prone to long-term power-on, causing coil heating and valve core jamming, affecting the safe operation of the system.
A safety protection circuit including light emitting diodes, resistors, energy storage capacitors and power-off shutdown relays was designed, and a power-off shutdown solenoid valve connected in parallel with emergency shutdown was added, which improves reliability through redundant shutdown function, and the power-off shutdown solenoid valve does not need to be charged for a long time.
It improves the reliability of the power-loss shutdown solenoid valve, enhances the safety and reliability of the speed regulator system, and avoids the problems of coil heating and valve core jamming caused by long-term power-on.
Smart Images
Figure CN223156698U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of governor safety protection, in particular to a safety protection circuit of a governor. Background Technique
[0002] The SDGJ-II power-off shutdown module is mainly applied to the governor system that requires shutdown when the AC and DC power supply systems disappear simultaneously in a power plant. After the AC power supply and DC power supply in the power plant disappear together, the governor automatically triggers the power-off shutdown solenoid valve, enabling the governor to enter the shutdown process, and sending the contact signal of the Jsd power-off relay to the central control system of the power plant. Most of the existing power-off shutdown schemes adopt the method of a solenoid valve with a single electromagnet spring self-resetting. When working normally, the solenoid valve is energized for a long time. When the AC and DC power supplies disappear simultaneously, the solenoid valve relies on the spring to switch the oil circuit for commutation to shut down. In this method, the valve core and coil of the solenoid valve are energized for a long time, which easily causes the coil to heat up and the valve core to jam, affecting safe operation and reducing reliability.
[0003] In view of this, it is necessary to provide a new safety protection circuit for a governor to overcome the above defects. Content of the Utility Model
[0004] The purpose of the utility model is to provide a safety protection circuit for a governor, which adds a power-off shutdown solenoid valve in parallel with the emergency shutdown. In the event of an accident of the governor, the function of redundant shutdown is added, and the power-off shutdown solenoid valve does not need to be energized for a long time, improving the reliability of the power-off shutdown solenoid valve and enhancing the safety and reliability of the entire governor system.
[0005] To achieve the above purpose, the technical solution provided by the utility model is realized as follows: A safety protection circuit for a governor includes a light-emitting diode D1, a light-emitting diode D2, a diode D3, a diode D4, a diode D7, a resistor R4, a light-emitting diode D6, an energy storage capacitor C1, a power-off shutdown relay Jsd, a switch K1, and a power-off shutdown solenoid valve Fsd;
[0006] The anode of the light-emitting diode D1 is electrically connected to the anode of the diode D3. The cathode of the light-emitting diode D1 is grounded. The cathode of the diode D3 is electrically connected to the first end of the resistor R4 and the first common terminal contact Jsd-1-A4 of the power-off shutdown relay Jsd. The second end of the resistor R4 is electrically connected to the anode of the light-emitting diode D6. The cathode of the light-emitting diode D6 is electrically connected to the negative electrode of the energy storage capacitor C1, the withdrawal contact, and the coil of the power-off shutdown relay Jsd and is grounded.
[0007] The positive electrode of the energy storage capacitor C1 is electrically connected to the first normally closed contact A5 of the power-loss shutdown relay Jsd. The normally closed contact A5 is electrically connected to the first common terminal contact Jsd-1-A4 or the first normally open contact A6 of the power-loss shutdown relay Jsd. The first normally open contact A6 is electrically connected to the input contact. The switch K1 is electrically connected to the coil of the power-loss shutdown relay Jsd and can be electrically connected to the input contact or the output contact.
[0008] The anode of the light-emitting diode D2 is electrically connected to the anode of the diode D4. The cathode of the diode D4 is electrically connected to the cathode of the diode D3 and the coil of the power-loss shutdown relay Jsd. The coil of the power-loss shutdown relay Jsd is grounded.
[0009] Preferably, the safety protection circuit of the speed governor further includes a diode D5. The anode of the diode D5 is electrically connected to the cathode of the diode D3. The cathode of the diode D5 is electrically connected to the first end of the resistor R4.
[0010] Preferably, the safety protection circuit of the speed governor includes a resistor R1, a resistor R2, and a resistor R3. The resistor R1 is electrically connected between the anode of the light-emitting diode D1 and the anode of the diode D3, and the resistor R1 is electrically connected to the AC24V power supply A1 output by the speed governor AC power supply. The resistor R2 is electrically connected between the anode of the light-emitting diode D2 and the anode of the diode D4, and the resistor R2 is electrically connected to the AC24V power supply A2 output by the speed governor AC power supply. The resistor R3 is electrically connected between the cathode of the diode D5 and the first end of the resistor R4.
[0011] Preferably, the safety protection circuit of the speed governor further includes a diode D7. The cathode of the diode D7 is electrically connected to the cathode of the diode D4. The anode of the diode D7 is electrically connected to the coil of the power-loss shutdown relay Jsd and is grounded.
[0012] Compared with the prior art, the beneficial effects are as follows: An additional power-loss shutdown solenoid valve in parallel with the emergency shutdown is added. In the event of an accident of the speed governor, a redundant shutdown function is added. Moreover, the power-loss shutdown solenoid valve does not need to be energized for a long time, which improves the reliability of the power-loss shutdown solenoid valve and enhances the safety and reliability of the entire speed governor system.
[0013] Other features and advantages of the present utility model will be described in the following description, and some will be obvious from the description, or can be understood through the implementation of the present utility model. The features and advantages of the present utility model can be realized and obtained through the elements and combinations specifically pointed out in the appended claims. These and other features of the present utility model will become more clear and understandable according to the following description and the appended claims, or can be understood through the implementation of the embodiments described in the present utility model. Brief Description of the Drawings
[0014] In order to more clearly illustrate the technical solutions of the embodiments of the present utility model, the drawings required for use in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of the present utility model, and therefore should not be regarded as limiting the scope. For those of ordinary skill in the art, without creative efforts, other related drawings can also be obtained based on these drawings.
[0015] Figure 1 It is the circuit diagram of the safety protection circuit of the speed governor provided for the present utility model. Detailed Embodiments
[0016] In order to make the objectives, technical solutions and beneficial technical effects of the present utility model clearer and more understandable, the present utility model will be further described in detail below in conjunction with the drawings and specific embodiments. It should be understood that the specific embodiments described in this specification are only for explaining the present utility model and not for limiting the present utility model.
[0017] It should be understood that the orientation or positional relationship indicated by the terms "upper", "lower", "front", "rear", "left", "right", "top", "bottom", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present utility model 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 should not be construed as a limitation of the present utility model.
[0018] It should also be noted that unless otherwise clearly specified and limited, terms such as "installation", "connection", "connection", "fixation", "setting", etc. should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or integrated; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two elements or the interaction relationship between two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be determined according to specific circumstances.
[0019] Please refer to Figure 1, the present utility model provides a safety protection circuit for a governor, including a light-emitting diode D1, a light-emitting diode D2, a diode D3, a diode D4, a diode D7, a resistor R4, a light-emitting diode D6, an energy storage capacitor C1, a power-off shutdown relay Jsd, a switch K1, and a power-off shutdown solenoid valve Fsd;
[0020] The anode of the light-emitting diode D1 is electrically connected to the anode of the diode D3. The cathode of the light-emitting diode D1 is grounded. The cathode of the diode D3 is electrically connected to the first end of the resistor R4 and the first common terminal contact Jsd-1-A4 of the power-off shutdown relay Jsd. The second end of the resistor R4 is electrically connected to the anode of the light-emitting diode D6. The cathode of the light-emitting diode D6 is electrically connected to the negative electrode of the energy storage capacitor C1, the withdrawal contact, and the coil of the power-off shutdown relay Jsd and is grounded.
[0021] The positive electrode of the energy storage capacitor C1 is electrically connected to the first normally closed contact A5 of the power-off shutdown relay Jsd. The normally closed contact A5 can be electrically connected to the first common terminal contact Jsd-1-A4 or the first normally open contact A6 of the power-off shutdown relay Jsd. The first normally open contact A6 is electrically connected to the input contact. The switch K1 is electrically connected to the coil of the power-off shutdown relay Jsd and can be electrically connected to the input contact or the withdrawal contact.
[0022] The anode of the light-emitting diode D2 is electrically connected to the anode of the diode D4. The cathode of the diode D4 is electrically connected to the cathode of the diode D3 and the coil of the power-off shutdown relay Jsd. The coil of the power-off shutdown relay Jsd is grounded.
[0023] In this way, the AC24V power supply A1 output by the governor's AC power supply is output to the light-emitting diode D1, and the light-emitting diode D1 lights up. The AC24V power supply A2 output by the governor's DC power supply is output to the light-emitting diode D2, and the light-emitting diode D2 lights up. The two 24V power supplies respectively pass through the diodes D3 and D4 to form a redundant 24V power supply. The two 24V power supplies supply power to the power-off shutdown relay Jsd alternately to make the power-off shutdown relay Jsd excited. The two 24V power supplies can also charge C1. When the charging is full, the light-emitting diode D6 lights up. The contact Jsd-1-A4 of the power-off shutdown relay Jsd is connected to the first normally closed contact A5, and the first normally closed contact A5 is connected to the energy storage capacitor C1;
[0024] When the power-off shutdown function is not required, the switch K1 is switched to the position of the withdrawal contact of the power-off shutdown solenoid valve Fsd and disconnected from the first normally open contact A6. At this time, the switch K1 is disconnected to cut off the power supply of the power-off shutdown solenoid valve Fsd;
[0025] When the power-off shutdown function is required, switch K1 is switched to the position connecting the energizing contact of the power-off shutdown solenoid valve Fsd to communicate with the first normally open contact A6. At this time, switch K1 is closed to energize the power-off shutdown solenoid valve Fsd;
[0026] When the power supply of the speed governor completely disappears, the light-emitting diodes D1 and D2 of the two 24V power supplies go out, the coil of the power-off shutdown relay Jsd loses power, the first normally closed contact A5 and the first normally open contact A6 are connected, and the energy storage capacitor C1 discharges to the coil of the power-off shutdown solenoid valve Fsd through the first normally closed contact A5, the first normally open contact A6 and switch K1. After the power-off shutdown solenoid valve is energized, the solenoid valve changes direction, which is equivalent to the emergency shutdown solenoid valve acting, causing the guide vane servomotor of the unit to shut down to the fully closed position. After the power-off shutdown solenoid valve acts, it needs to be manually reset.
[0027] When the power-off shutdown relay Jsd loses power, the second common terminal contact A7 of the power-off shutdown relay Jsd is electrically connected to the second normally closed contact A8 or the second normally open contact A9, and the power-off signal is sent to the plant central control system.
[0028] In a preferred embodiment, the safety protection circuit of the speed governor further includes a diode D5. The anode of the diode D5 is electrically connected to the cathode of the diode D3, and the cathode of the diode D5 is electrically connected to the first end of the resistor R4.
[0029] In a preferred embodiment, the safety protection circuit of the speed governor includes a resistor R1, a resistor R2, and a resistor R3; the resistor R1 is electrically connected between the anode of the light-emitting diode D1 and the anode of the diode D3, and the resistor R1 is electrically connected to the AC24V power supply A1 output by the speed governor AC power supply. The resistor R2 is electrically connected between the anode of the light-emitting diode D2 and the anode of the diode D4, and the resistor R2 is electrically connected to the AC24V power supply A2 output by the speed governor AC power supply. The resistor R3 is electrically connected between the cathode of the diode D5 and the first end of the resistor R4.
[0030] In a preferred embodiment, the safety protection circuit of the speed governor further includes a diode D7. The cathode of the diode D7 is electrically connected to the cathode of the diode D4, and the anode of the diode D7 is electrically connected to the coil of the power-off shutdown relay Jsd and grounded.
[0031] The general power-off shutdown scheme is to use a solenoid valve with a single electromagnet spring self-resetting method. During normal operation, the solenoid valve is energized for a long time. When the AC and DC power supplies disappear simultaneously, the solenoid valve relies on the spring to change the direction and switch the oil circuit to shut down the power-off motor module. In this method, the solenoid valve spool and coil are energized for a long time, which is likely to cause the coil to heat up and the spool to jam, affecting the safe operation and reducing the reliability.
[0032] For the safety protection circuit of the governor adopting the energy storage type power failure shutdown module of the present utility model, a power failure shutdown solenoid valve in parallel with the emergency shutdown is added. In the event of an accident of the governor, the function of redundant shutdown is added. Moreover, the power failure shutdown solenoid valve does not need to be energized for a long time, which improves the reliability of the power failure shutdown solenoid valve and enhances the safety and reliability of the entire governor system.
[0033] The present utility model is not limited solely to what is described in the specification and embodiments. Therefore, for those skilled in the art, additional advantages and modifications can be easily achieved. Thus, without departing from the spirit and scope of the general concept defined by the claims and their equivalents, the present utility model is not limited to specific details, representative devices, and the illustrated examples shown and described herein.
Claims
1. A safety protection circuit for a speed governor, characterized in that, It includes light-emitting diode D1, light-emitting diode D2, diode D3, diode D4, diode D7, resistor R4, light-emitting diode D6, energy storage capacitor C1, power-loss shutdown relay Jsd, switch K1, and power-loss shutdown solenoid valve Fsd; The anode of the light-emitting diode D1 is electrically connected to the anode of the diode D3. The cathode of the light-emitting diode D1 is grounded. The cathode of the diode D3 is electrically connected to the first end of the resistor R4 and the first common terminal contact Jsd-1-A4 of the power-loss shutdown relay Jsd. The second end of the resistor R4 is electrically connected to the anode of the light-emitting diode D6. The cathode of the light-emitting diode D6 is electrically connected to the negative electrode of the energy storage capacitor C1, the withdrawal contact, and the coil of the power-loss shutdown relay Jsd and is grounded. The positive electrode of the energy storage capacitor C1 is electrically connected to the first normally closed contact A5 of the power-loss shutdown relay Jsd. The normally closed contact A5 can be electrically connected to the first common terminal contact Jsd-1-A4 or the first normally open contact A6 of the power-loss shutdown relay Jsd. The first normally open contact A6 is electrically connected to the input contact. The switch K1 is electrically connected to the coil of the power-loss shutdown relay Jsd and can be electrically connected to the input contact or the withdrawal contact. The anode of the light-emitting diode D2 is electrically connected to the anode of the diode D4. The cathode of the diode D4 is electrically connected to the cathode of the diode D3 and the coil of the power-loss shutdown relay Jsd. The coil of the power-loss shutdown relay Jsd is grounded.
2. The safety protection circuit of the speed governor according to claim 1, characterized in that, The safety protection circuit of the speed governor further includes a diode D5. The anode of the diode D5 is electrically connected to the cathode of the diode D3. The cathode of the diode D5 is electrically connected to the first end of the resistor R4.
3. The safety protection circuit of the governor according to claim 1, characterized in that, The safety protection circuit of the speed governor includes a resistor R1, a resistor R2, and a resistor R3. The resistor R1 is electrically connected between the anode of the light-emitting diode D1 and the anode of the diode D3, and the resistor R1 is electrically connected to the AC24V power supply A1 output by the speed governor AC power supply. The resistor R2 is electrically connected between the anode of the light-emitting diode D2 and the anode of the diode D4, and the resistor R2 is electrically connected to the AC24V power supply A2 output by the speed governor AC power supply. The resistor R3 is electrically connected between the cathode of the diode D5 and the first end of the resistor R4.
4. The safety protection circuit of the speed governor according to claim 1, characterized in that, The safety protection circuit of the speed governor further includes a diode D7. The cathode of the diode D7 is electrically connected to the cathode of the diode D4. The anode of the diode D7 is electrically connected to the coil of the power-loss shutdown relay Jsd and is grounded.