An outlet valve full closure jump auxiliary machine protection system and method

Abstract

This invention belongs to the field of auxiliary equipment protection and control technology, and relates to an auxiliary equipment protection system and method for tripping when the outlet valve is fully closed. The system includes a signal acquisition unit, a runtime sequence control unit, an outlet valve full-closure timing control unit, an outlet valve status anti-jitter and anomaly detection unit, an anomaly alarm unit, and a multi-condition tripping integrated unit. By acquiring the auxiliary equipment operating status, outlet valve position, upstream pressure, and downstream flow signals, and after delay processing to avoid startup and instantaneous interference, it uses a combination of NOT gates and pulse logic to identify valve status anomalies, and combines this with S-R triggers to implement alarms and interlocking. Finally, it generates a tripping command based on multi-condition logic integration. This invention solves the problems of false tripping, failure to tripping, and unknown anomalies that easily occur under traditional single-point signal or combinational logic, significantly improving the reliability and safety of the auxiliary equipment protection system.

Description

Technical Field

[0001] This invention belongs to the field of auxiliary machine protection and control technology, and relates to an auxiliary machine protection system and method for fully closing and tripping an outlet valve. Background Technology

[0002] In the field of auxiliary equipment operation control, the status monitoring of outlet valves is a crucial link in ensuring the safe and stable operation of equipment. Currently, when auxiliary equipment such as pumps and fans operate for extended periods with their outlet valves fully closed, the inability to properly discharge the medium can easily lead to equipment overload, resulting in component damage or even system failure.

[0003] Meanwhile, existing protection logic still has significant shortcomings in dealing with abnormal signal conditions, making it difficult to balance reliability and safety. For example, some systems use tripping judgment logic based on a single-point signal of the fully closed outlet valve. Although the structure is simple, it is easily affected by signal jitter or external electromagnetic interference in actual operation, frequently causing protection malfunctions and unnecessary shutdowns. Furthermore, when faults such as open circuits or loose connections occur in the signal transmission line, this logic cannot accurately identify the true state, which can easily lead to protection failure to operate, causing auxiliary equipment to continue running under dangerous conditions and further increasing the risk of equipment damage.

[0004] To improve reliability, existing technologies also employ a combination of inverted logic for the fully closed and fully open signals of the auxiliary machine outlet valve, attempting to reduce the probability of erroneous operation through dual-signal interlocking. However, this method may still falsely trigger protection actions when the fully closed and fully open signals of the outlet valve synchronously reverse due to equipment malfunction or communication failure. More seriously, when valve position feedback becomes disordered, resulting in an abnormal state where both the fully closed and fully open signals are true simultaneously, this logic cannot effectively identify and respond correctly, leaving a protection blind spot and affecting the operational stability of the entire system. Summary of the Invention

[0005] This invention provides an auxiliary machine protection system and method for fully closing and tripping outlet valves, which solves the problems of false tripping, failure to tripping, and unknown abnormalities that are prone to occur under traditional single-point signals or combinational logic, and significantly improves the reliability and safety of the auxiliary machine protection system.

[0006] To achieve the above objectives, the present invention employs the following technical solution: In a first aspect, the present invention provides an auxiliary machine protection system for a fully closed outlet valve, comprising: The signal acquisition unit is used to acquire auxiliary machine operation feedback signals, auxiliary machine outlet door fully closed signals, auxiliary machine outlet door fully open signals, auxiliary machine outlet door high pressure signals, and auxiliary machine outlet door low flow signals. The operation sequence control unit is connected to the signal acquisition unit and is used to perform delayed closing processing on the auxiliary machine operation feedback signal and output a stable operation signal for the auxiliary machine. The exit door fully closed timing control unit is connected to the signal acquisition unit and is used to perform delayed closing processing on the auxiliary machine exit door fully closed signal and output the exit door continuously fully closed signal. The exit door status anti-jitter and abnormal detection unit is connected to the signal acquisition unit. It is used to perform negation and pulse processing on the fully open signal of the auxiliary machine exit door, and to logically combine it with the fully closed signal of the auxiliary machine exit door to output the exit door status jitter and abnormal signal. An abnormal alarm unit is connected to the exit door status anti-shaking and abnormal detection unit, and is used to output an alarm signal and a non-logic interlocking signal when the exit door status shaking and abnormal signal is valid. The multi-condition tripping integrated unit is connected to the runtime sequence control unit, the outlet gate fully closed sequence control unit, the abnormal alarm unit, and the signal acquisition unit. It is used to generate an auxiliary machine tripping signal based on the auxiliary machine stable operation signal, the outlet gate continuously fully closed signal, the non-logic interlocking signal, the high pressure signal before the auxiliary machine outlet gate, and the low flow signal after the auxiliary machine outlet gate.

[0007] Preferably, the delay duration of the runtime sequence control unit is set according to the time required for the auxiliary machine to switch from a stopped state to a stable operating state when it starts up.

[0008] Preferably, the delay duration of the outlet valve fully closed timing control unit is set according to the safe time threshold for continuous operation of the auxiliary machine when the outlet valve is fully closed.

[0009] Preferably, the exit door status anti-shake and anomaly detection unit includes: The NOT gate logic subunit is used to perform a NOT operation on the fully open signal of the auxiliary machine's outlet gate to generate a non-fully open signal of the outlet gate. A pulse generation subunit, connected to the NOT gate logic subunit, is used to generate a pulse signal with a set pulse width for the not fully open signal of the output gate; The first logic AND sub-unit is used to perform a logic AND operation between the pulse signal and the auxiliary machine outlet door fully closed signal; The second logic AND subunit is used to perform a logic AND operation on the auxiliary machine outlet door fully closed signal and the outlet door fully open signal. The logic OR subunit is used to perform a logic OR operation on the outputs of the first logic AND subunit and the second logic AND subunit to generate the exit gate status jitter and abnormal signal.

[0010] Preferably, the pulse width of the pulse signal generated by the pulse generation subunit is set according to the normal stroke time required for the auxiliary machine outlet valve to move from the fully open state to the fully closed state.

[0011] Preferably, the abnormal alarm unit includes a set / reset trigger and an alarm device. Its set terminal receives the exit door status jitter and abnormal signal, and its reset terminal receives the manual reset fault signal. One output terminal of the set / reset trigger is connected to the alarm device, and the other output terminal is inverted by a NOT gate to generate the non-logic blocking signal.

[0012] Preferably, the multi-condition tripping integrated unit includes: The first logic OR subunit is used to perform a logic OR operation on the high pressure signal before the auxiliary machine outlet gate and the low flow signal after the auxiliary machine outlet gate to generate an abnormal pressure or flow auxiliary signal. The second logic OR subunit is used to perform a logic OR operation on the non-logic interlock signal and the pressure or flow abnormality auxiliary signal. The AND logic subunit is used to generate the final auxiliary machine trip signal by performing an AND operation on the auxiliary machine stable operation signal, the outlet gate continuously fully closed signal, and the output result of the second OR logic subunit.

[0013] Preferably, the pulse width setting value of the pulse signal generated by the pulse generation subunit is less than the normal travel time required for the auxiliary machine outlet valve to move from the fully open state to the fully closed state.

[0014] Preferably, the abnormal alarm unit further includes a manual reset interface for receiving an external manual reset fault signal; when the set reset trigger is set due to the exit door status jitter and the abnormal signal being valid, it is reset by the manual reset fault signal.

[0015] Secondly, the present invention provides a method for protecting auxiliary equipment from complete shutdown of an outlet valve, comprising the following steps: Collect auxiliary machine operation feedback signals, auxiliary machine outlet gate fully closed signal, auxiliary machine outlet gate fully open signal, auxiliary machine outlet gate high pressure signal and auxiliary machine outlet gate low flow signal. The auxiliary machine operation feedback signal is processed by delay closure to generate a stable operation signal for the auxiliary machine; The auxiliary machine outlet door fully closed signal is delayed and closed to generate an outlet door continuously fully closed signal; The signal of the fully open auxiliary machine outlet door is subjected to NOT and pulse processing, and the processed signal is logically combined with the signal of the fully closed auxiliary machine outlet door to generate outlet door status jitter and abnormal signals. When the exit door status jitter and abnormal signal are valid, an alarm signal and a non-logic interlock signal are generated; The auxiliary machine trip signal is generated by logically synthesizing the stable operation signal of the auxiliary machine, the continuously fully closed signal of the outlet gate, the non-logic interlocking signal, the high pressure signal before the auxiliary machine outlet gate, and the low flow signal after the auxiliary machine outlet gate.

[0016] Compared with the prior art, the present invention has the following beneficial effects: This invention avoids false tripping caused by auxiliary machine startup or instantaneous signal interference by introducing runtime sequence control and outlet gate full-closure sequence control mechanisms. By inverting the outlet gate full-open signal and generating a pulse signal, combined with AND / OR logic, it effectively avoids the signal transition period during the normal valve closing process, preventing misjudgment. At the same time, it can identify the abnormal state where the outlet gate is fully closed and fully open simultaneously, and realize alarm locking and logic interlocking through a set-reset trigger. This solves the problems of false operation, failure to operate, and unknown anomalies that are prone to occur under traditional single-point signal or combination logic, and significantly improves the reliability and safety of the auxiliary machine protection system. Attached Figure Description

[0017] To more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of the present invention and should not be regarded as a limitation on the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0018] Figure 1 This is a flowchart of an auxiliary machine protection method for fully closing and tripping an outlet valve according to the present invention. Detailed Implementation

[0019] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. The components of the embodiments of the present invention described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0020] Therefore, the following detailed description of the embodiments of the invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the invention without inventive effort are within the scope of protection of the invention.

[0021] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0022] In the description of the embodiments of the present invention, it should be noted that if terms such as "upper," "lower," "horizontal," or "inner" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the product of the invention is in use, they are only for the convenience of describing the present invention 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, and therefore should not be construed as a limitation of the present invention. Furthermore, terms such as "first" and "second" are only used to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0023] Furthermore, the use of the term "horizontal" does not imply that the component must be absolutely horizontal, but rather that it can be slightly tilted. For example, "horizontal" simply means that its direction is more horizontal than "vertical," and does not mean that the structure must be completely horizontal, but can be slightly tilted.

[0024] In the description of the embodiments of the present invention, it should also be noted that, unless otherwise explicitly specified and limited, the terms "set," "install," "connect," and "link" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in the present invention according to the specific circumstances.

[0025] The present invention will now be described in further detail with reference to the accompanying drawings: The first objective of this invention is to provide an auxiliary machine protection system for fully closed outlet valves, comprising: The signal acquisition unit is used to acquire auxiliary machine operation feedback signals, auxiliary machine outlet door fully closed signals, auxiliary machine outlet door fully open signals, auxiliary machine outlet door high pressure signals, and auxiliary machine outlet door low flow signals. The operation sequence control unit is connected to the signal acquisition unit and is used to perform delayed closing processing on the auxiliary machine operation feedback signal and output a stable operation signal for the auxiliary machine. The exit door fully closed timing control unit is connected to the signal acquisition unit and is used to perform delayed closing processing on the auxiliary machine exit door fully closed signal and output the exit door continuously fully closed signal. The exit door status anti-jitter and abnormal detection unit is connected to the signal acquisition unit. It is used to perform negation and pulse processing on the fully open signal of the auxiliary machine exit door, and to logically combine it with the fully closed signal of the auxiliary machine exit door to output the exit door status jitter and abnormal signal. An abnormal alarm unit is connected to the exit door status anti-shaking and abnormal detection unit, and is used to output an alarm signal and a non-logic interlocking signal when the exit door status shaking and abnormal signal is valid. The multi-condition tripping integrated unit is connected to the runtime sequence control unit, the outlet gate fully closed sequence control unit, the abnormal alarm unit, and the signal acquisition unit. It is used to generate an auxiliary machine tripping signal based on the auxiliary machine stable operation signal, the outlet gate continuously fully closed signal, the non-logic interlocking signal, the high pressure signal before the auxiliary machine outlet gate, and the low flow signal after the auxiliary machine outlet gate.

[0026] The signal acquisition unit, as the front-end sensing module of the entire system, is responsible for acquiring five key signals from field instruments and switching nodes in real time: the auxiliary machine operation feedback signal usually comes from the current detection device of the motor primary circuit or the operating status flag bit in the DCS system, which is used to reflect whether the auxiliary machine is currently in a powered-on state; the auxiliary machine outlet gate fully closed signal and the auxiliary machine outlet gate fully open signal are digital input signals provided by the valve position limit switch, which respectively indicate whether the outlet valve is completely closed or completely open; the high pressure signal before the auxiliary machine outlet gate is generally monitored by the pressure transmitter and output as a high-level signal after comparison with a set threshold, indicating that the back pressure on the outlet side is too high; the low flow signal after the auxiliary machine outlet gate comes from the flow meter or differential pressure device, which is triggered when the fluid delivery volume is lower than the safety threshold.

[0027] The runtime sequence control unit receives the auxiliary machine operation feedback signal from the signal acquisition unit and performs a delayed closing process on it. The so-called delayed closing means that when the operation feedback signal changes from "stop" to "run", a preset time delay is required before the auxiliary machine is considered to have entered a stable operating state and a high-level auxiliary machine stable operation signal is output. The purpose is to avoid the risk of false tripping caused by the outlet valve not opening in time at the moment of auxiliary machine startup.

[0028] The outlet gate fully closed timing control unit also employs a delayed closing mechanism, but its input signal is the auxiliary machine outlet gate fully closed signal. This unit starts a timer after detecting a valid fully closed signal, and only outputs an "outlet gate continuously fully closed signal" if the signal remains valid for more than a set time limit. This delay setting is determined based on the safe operating time allowed for the auxiliary machine in the outlet gate closed state; for example, some water pumps allow short-term valve closure operation for no more than 5 minutes. The outlet gate status anti-jitter and anomaly detection unit performs logical reconstruction processing on the outlet gate fully open signal. First, it performs a "NOT" operation on the signal, converting the "fully open" state to a "not fully open" state. Then, it pulses the "not fully open" signal, generating a pulse signal with a certain width. This pulse signal represents the transient process of transitioning from "fully open" to "not fully open." Next, it performs a logical AND operation between this pulse signal and the original auxiliary machine outlet gate fully closed signal, and simultaneously performs another AND operation between the "fully open" signal and the "fully closed" signal. Finally, it performs a logical OR operation on the results of the two AND operations, outputting the outlet gate status jitter and anomaly signal. This composite logic structure can temporarily shield the influence of intermediate transition states during normal valve switching (such as from fully open to fully closed), preventing misjudgment due to the temporary coexistence of two limit signals; more importantly, when both "fully open" and "fully closed" signals are true at the same time (such as sensor failure or line crosstalk), the unit can still output an abnormal status signal to indicate that an abnormality exists.

[0029] The abnormal alarm unit receives the aforementioned outlet valve status jitter and abnormal signals, and triggers the set-reset (SR) trigger to set when the signals are valid, thereby outputting an alarm signal to remind operators to check the valve status or sensor health. Simultaneously, this set signal is inverted to generate a non-logic interlocking signal, which participates in the final tripping logic. This design implements a hierarchical response mechanism of first alarming, then interlocking, and finally tripping, enhancing human-machine collaboration capabilities. Furthermore, this alarm status can be cleared by an external manual reset signal, ensuring that the system can restore normal logical judgment functions after the fault is cleared.

[0030] The multi-condition tripping integrated unit, as the final decision-making module of the system, integrates the output signals of multiple front-end units and the original acquired signals, and performs comprehensive logical operations. Specifically, this unit first performs a logical OR operation on the high pressure signal before the auxiliary machine outlet gate and the low flow signal after the auxiliary machine outlet gate to form a "pressure or flow abnormality auxiliary signal" to indicate whether there is a blockage or transmission failure at the outlet end. Then, this auxiliary signal and a non-logical interlocking signal are input into a logical OR gate. The output of this OR gate, along with the stable operation signal of the auxiliary machine and the continuously closed signal of the outlet gate, are input into a logical AND gate to finally generate the auxiliary machine tripping signal. This means that a tripping action will only be triggered when multiple conditions are met simultaneously: the auxiliary machine is operating stably, the outlet gate is continuously closed, and there are conditions such as high outlet pressure, low flow, or non-logical interlocking. This multi-condition coupling mechanism significantly improves the fault tolerance and accuracy of the tripping logic, effectively preventing unplanned shutdowns caused by erroneous single signal activation.

[0031] The delay duration of the runtime sequence control unit is set according to the time required for the auxiliary machine to switch from a stopped state to a stable operating state during startup, thereby effectively eliminating the risk of false tripping caused by the outlet valve not opening in time during the startup phase. The "delay duration" is set based on the actual time period from when the auxiliary machine receives the startup command until its mechanical system reaches its rated speed, its electrical parameters tend to stabilize, and its fluid system establishes basic circulation capability. This time can be obtained through on-site commissioning and measurement, or it can be estimated based on the startup curve provided by the equipment manufacturer, with a certain margin reserved to accommodate fluctuations under different operating conditions.

[0032] The delay time of the outlet valve fully closed timing control unit is set according to the safe time threshold for continuous operation of the auxiliary machine when the outlet valve is fully closed, so as to ensure that the system can still trigger the protection action in time when the valve is in the closed state for a long time, and avoid equipment damage caused by the auxiliary machine due to pressure buildup, overheating or dry running.

[0033] The exit door status anti-shake and anomaly detection unit includes: The NOT gate logic subunit is used to perform a NOT operation on the fully open signal of the auxiliary machine's outlet gate to generate a non-fully open signal of the outlet gate. A pulse generation subunit, connected to the NOT gate logic subunit, is used to generate a pulse signal with a set pulse width for the not fully open signal of the output gate; The first logic AND sub-unit is used to perform a logic AND operation between the pulse signal and the auxiliary machine outlet door fully closed signal; The second logic AND subunit is used to perform a logic AND operation on the auxiliary machine outlet door fully closed signal and the outlet door fully open signal. The logic OR subunit is used to perform a logic OR operation on the outputs of the first logic AND subunit and the second logic AND subunit to generate the exit gate status jitter and abnormal signal.

[0034] The NOT gate logic subunit receives a fully open signal from the field auxiliary valve outlet. This signal is typically a digital input indicating whether the valve is fully open. The NOT gate logic subunit performs a logical inversion operation on this signal, generating a partially open outlet valve signal. This signal is high when the valve is not fully open. This process provides the basis for subsequent pulse generation and logic combination. The pulse generation subunit is connected to the output of the NOT gate logic subunit and receives the partially open outlet valve signal, generating a pulse signal with a fixed pulse width. This pulse signal is triggered when the partially open outlet valve signal changes from low to high, and automatically resets after a preset duration. The function of this pulse is to simulate the normal travel time window required for the valve to switch from fully open to fully closed. During this period, the appearance of a fully closed outlet valve signal is considered abnormal.

[0035] The first logic AND subunit is used to perform a logical AND operation between the pulse signal output by the pulse generation subunit and the auxiliary machine outlet door fully closed signal. When the outlet door is closing, the pulse signal is valid (high level). If the outlet door fully closed signal is detected at this time, the AND operation result is true, indicating that the current state is in the transition phase of the closing process, which is an unexpected behavior.

[0036] The second logic AND subunit directly performs a logical AND operation on the auxiliary machine outlet gate fully closed signal and the outlet gate fully open signal. This path does not involve pulse delay and reflects the instantaneous state where both signals are true simultaneously. When the valve has been operating stably but "fully closed" and "fully open" signals coexist for an extended period, it indicates a possible signal contradiction.

[0037] The OR subunit receives the outputs from the first AND subunit and the second AND subunit, performs a logical OR operation on them, and finally generates exit gate status jitter and abnormal signals. If either path output is valid, it is determined that the exit gate status is abnormal or is in a monitored abnormal process, and this signal will be sent to the abnormal alarm unit. Through this dual-path design, the system can both detect signal jitter during normal closing and capture coexisting abnormal states, improving the robustness of the judgment.

[0038] The pulse width of the pulse signal generated by the pulse generation subunit is set according to the normal travel time required for the auxiliary machine outlet valve to move from the fully open state to the fully closed state, so that no false alarm or false tripping will occur during the normal closing stroke of the valve; at the same time, when there is a situation of "not fully open" and "fully closed" within this time window, potential signal contradictions or equipment abnormalities can be effectively identified, thereby triggering an alarm.

[0039] The abnormal alarm unit includes a set / reset trigger and an alarm device. Its set terminal receives the exit door status jitter and abnormal signal, and its reset terminal receives the manual reset fault signal. One output terminal of the set / reset trigger is connected to the alarm device, and the other output terminal is inverted by a NOT gate to generate the non-logic lockout signal.

[0040] A set-reset trigger is a digital logic element with bistable characteristics. It can switch from one stable state to another and maintain that state under external stimulation until a reverse reset command is received. The set terminal of the trigger is connected to the exit gate status bounce and abnormal signal. When this signal is valid, the trigger is set and enters the alarm state. An alarm device is connected to the output terminal of the set-reset trigger to activate an audible and visual alarm or other forms of warning output after the trigger is set, such as a light panel alarm in a DCS system or a pop-up notification on an HMI interface, thereby providing operators with intuitive and timely fault information.

[0041] The output of the set-reset trigger is connected to an inverting gate to generate a non-logic latching signal. This signal is one of the key enable conditions in the tripping logic, and its level directly depends on whether the trigger has been set. When the trigger is not set, the non-logic latching signal is high (allowing passage), and subsequent logic is not latched; once the trigger is set, the non-logic latching signal becomes low (forming a latch), and subsequent logic is latched, thus blocking the path to release the tripping condition. In addition, the reset terminal is used to receive manual reset fault signals, which originate from reset commands issued by the operator through a local or remote operating interface, such as pressing the "Fault Reset" button on the control cabinet or clicking the "Confirm and Clear Alarm" option in the monitoring software. Only after maintenance personnel confirm that the on-site situation is safe and actively perform the reset operation will the set-reset trigger exit the set state and restore the normal logic path.

[0042] The multi-condition tripping integrated unit includes: The first logic OR subunit is used to perform a logical OR operation on the high pressure signal before the auxiliary machine outlet and the low flow signal after the auxiliary machine outlet to generate an auxiliary signal for pressure or flow abnormality. These two signals respectively represent the potential risk of pressure buildup and loss of conveying capacity on the auxiliary machine outlet side, which are typical manifestations of abnormal load. By combining them through an "OR" logic, it means that as long as either high pressure or low flow occurs, it is determined that there is an operational risk, and thus a unified auxiliary signal for pressure or flow abnormality is generated.

[0043] The second logic OR subunit is used to perform a logical OR operation on the non-logic interlock signal and the pressure or flow abnormality auxiliary signal; a valid non-logic interlock signal indicates that the system has no abnormal outlet gate status; while the pressure or flow abnormality auxiliary signal indicates that the actual operating parameters deviate from the safe range. If any of the above signals is true, the second logic OR subunit outputs a high level.

[0044] The AND logic subunit is used to generate the final auxiliary machine trip signal based on the AND operation of the auxiliary machine stable operation signal, the outlet valve continuously fully closed signal, and the output of the second OR logic subunit. The valid auxiliary machine stable operation signal indicates that the equipment has left the start-up transition phase and entered the normal operating range, at which point the protection function should be activated; the valid outlet valve continuously fully closed signal indicates that the valve has been closed for an extended period, which may lead to pump overheating or mechanical damage. The pulse width setting value of the pulse signal generated by the pulse generation subunit is less than the normal travel time required for the auxiliary machine outlet valve to move from the fully open state to the fully closed state, so as to ensure that the system will not misjudge an abnormal state due to the instantaneous "fully closed" signal during the normal closing process of the valve.

[0045] The second objective of this invention is to provide a method for protecting auxiliary equipment from complete shutdown of the outlet valve, such as... Figure 1 As shown, it includes the following steps: Collect auxiliary machine operation feedback signals, auxiliary machine outlet gate fully closed signal, auxiliary machine outlet gate fully open signal, auxiliary machine outlet gate high pressure signal and auxiliary machine outlet gate low flow signal. The auxiliary machine operation feedback signal is processed by delay closure to generate a stable operation signal for the auxiliary machine; The auxiliary machine outlet door fully closed signal is delayed and closed to generate an outlet door continuously fully closed signal; The signal of the fully open auxiliary machine outlet door is subjected to NOT and pulse processing, and the processed signal is logically combined with the signal of the fully closed auxiliary machine outlet door to generate outlet door status jitter and abnormal signals. When the exit door status jitter and abnormal signal are valid, an alarm signal and a non-logic interlock signal are generated; The auxiliary machine trip signal is generated by logically synthesizing the stable operation signal of the auxiliary machine, the continuously fully closed signal of the outlet gate, the non-logic interlocking signal, the high pressure signal before the auxiliary machine outlet gate, and the low flow signal after the auxiliary machine outlet gate.

[0046] In this context, NOT represents a NOT gate; AND represents an AND gate; OR represents an OR gate; and SR represents a set / reset flip-flop, with S being the set input and R being the reset input.

[0047] This invention acquires basic state information through signal acquisition, avoids the impact of startup transients through delay processing, eliminates signal jitter and conflict interference through pulse and logic combinations, achieves human-machine collaborative response by combining alarm interlocking, and finally makes a reliable tripping decision based on the superposition of multiple conditions. This method not only solves the problem of false tripping or failure to trip caused by the failure of a single signal in traditional protection, but also enhances the ability to identify and respond to abnormal operating conditions, significantly improving the safety of auxiliary equipment operation and the overall intelligence level of the system.

[0048] The above are merely preferred embodiments of the present invention and are not intended to limit the present invention. Various modifications and variations can be made to the present invention by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. An auxiliary machine protection system for fully closed outlet valves, characterized in that, include: The signal acquisition unit is used to acquire auxiliary machine operation feedback signals, auxiliary machine outlet door fully closed signals, auxiliary machine outlet door fully open signals, auxiliary machine outlet door high pressure signals, and auxiliary machine outlet door low flow signals. The operation sequence control unit is connected to the signal acquisition unit and is used to perform delayed closing processing on the auxiliary machine operation feedback signal and output a stable operation signal for the auxiliary machine. The exit door fully closed timing control unit is connected to the signal acquisition unit and is used to perform delayed closing processing on the auxiliary machine exit door fully closed signal and output the exit door continuously fully closed signal. The exit door status anti-jitter and abnormal detection unit is connected to the signal acquisition unit. It is used to perform negation and pulse processing on the fully open signal of the auxiliary machine exit door, and to logically combine it with the fully closed signal of the auxiliary machine exit door to output the exit door status jitter and abnormal signal. An abnormal alarm unit is connected to the exit door status anti-shaking and abnormal detection unit, and is used to output an alarm signal and a non-logic interlocking signal when the exit door status shaking and abnormal signal is valid. The multi-condition tripping integrated unit is connected to the runtime sequence control unit, the outlet gate fully closed sequence control unit, the abnormal alarm unit, and the signal acquisition unit. It is used to generate an auxiliary machine tripping signal based on the auxiliary machine stable operation signal, the outlet gate continuously fully closed signal, the non-logic interlocking signal, the high pressure signal before the auxiliary machine outlet gate, and the low flow signal after the auxiliary machine outlet gate.

2. The auxiliary machine protection system for fully closed and tripped outlet valve according to claim 1, characterized in that, The delay duration of the runtime sequence control unit is set according to the time required for the auxiliary machine to switch from a stopped state to a stable operating state when it starts up.

3. The auxiliary machine protection system for fully closed and tripped outlet valve according to claim 1, characterized in that, The delay duration of the outlet valve fully closed timing control unit is set according to the safe time threshold for continuous operation of the auxiliary machine when the outlet valve is fully closed.

4. The auxiliary machine protection system for fully closed and tripped outlet valve according to claim 1, characterized in that, The exit door status anti-shake and anomaly detection unit includes: The NOT gate logic subunit is used to perform a NOT operation on the fully open signal of the auxiliary machine's outlet gate to generate a non-fully open signal of the outlet gate. A pulse generation subunit, connected to the NOT gate logic subunit, is used to generate a pulse signal with a set pulse width for the not fully open signal of the output gate; The first logic AND sub-unit is used to perform a logic AND operation between the pulse signal and the auxiliary machine outlet door fully closed signal; The second logic AND subunit is used to perform a logic AND operation on the auxiliary machine outlet door fully closed signal and the outlet door fully open signal. The logic OR subunit is used to perform a logic OR operation on the outputs of the first logic AND subunit and the second logic AND subunit to generate the exit gate status jitter and abnormal signal.

5. The auxiliary machine protection system for fully closed and tripped outlet valve according to claim 4, characterized in that, The pulse width of the pulse signal generated by the pulse generation subunit is set according to the normal stroke time required for the auxiliary machine outlet valve to move from the fully open state to the fully closed state.

6. The auxiliary machine protection system for fully closed outlet valves according to claim 1, characterized in that, The abnormal alarm unit includes a set / reset trigger and an alarm device. Its set terminal receives the exit door status jitter and abnormal signal, and its reset terminal receives the manual reset fault signal. One output terminal of the set / reset trigger is connected to the alarm device, and the other output terminal is inverted by a NOT gate to generate the non-logic lockout signal.

7. The auxiliary machine protection system for fully closed outlet valves according to claim 1, characterized in that, The multi-condition tripping integrated unit includes: The first logic OR subunit is used to perform a logic OR operation on the high pressure signal before the auxiliary machine outlet gate and the low flow signal after the auxiliary machine outlet gate to generate an abnormal pressure or flow auxiliary signal. The second logic OR subunit is used to perform a logic OR operation on the non-logic interlock signal and the pressure or flow abnormality auxiliary signal. The AND logic subunit is used to generate the final auxiliary machine trip signal by performing an AND operation on the auxiliary machine stable operation signal, the outlet gate continuously fully closed signal, and the output result of the second OR logic subunit.

8. The auxiliary machine protection system for fully closed outlet valves according to claim 1, characterized in that, The pulse width setting value of the pulse signal generated by the pulse generation subunit is less than the normal travel time required for the auxiliary machine outlet valve to move from the fully open state to the fully closed state.

9. The auxiliary machine protection system for fully closed outlet valves according to claim 1, characterized in that, The abnormal alarm unit also includes a manual reset interface for receiving an external manual reset fault signal; when the set reset trigger is set due to the exit door status jitter and the abnormal signal is valid, it is reset by the manual reset fault signal.

10. A method for protecting auxiliary equipment from complete shutdown of the outlet valve, characterized in that, The system based on any one of claims 1 to 9 includes the following steps: Collect auxiliary machine operation feedback signals, auxiliary machine outlet gate fully closed signal, auxiliary machine outlet gate fully open signal, auxiliary machine outlet gate high pressure signal and auxiliary machine outlet gate low flow signal. The auxiliary machine operation feedback signal is processed by delay closure to generate a stable operation signal for the auxiliary machine; The auxiliary machine outlet door fully closed signal is delayed and closed to generate an outlet door continuously fully closed signal; The signal of the fully open auxiliary machine outlet door is subjected to NOT and pulse processing, and the processed signal is logically combined with the signal of the fully closed auxiliary machine outlet door to generate outlet door status jitter and abnormal signals. When the exit door status jitter and abnormal signal are valid, an alarm signal and a non-logic interlock signal are generated; The auxiliary machine trip signal is generated by logically synthesizing the stable operation signal of the auxiliary machine, the continuously fully closed signal of the outlet gate, the non-logic interlocking signal, the high pressure signal before the auxiliary machine outlet gate, and the low flow signal after the auxiliary machine outlet gate.

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