A safety breathing valve online monitoring device and monitoring method

Abstract

The present invention provides a safe type of online monitoring device and monitoring method for breathing valves. The device is equipped with a set of monitoring interfaces on each side of the breathing valve where the valve disc contacts the valve seat, and each set of monitoring interfaces is respectively connected to the corresponding transmission pipe, and the other end of the transmission pipe is connected to the output end of the one-way valve, and the input end of the one-way valve is connected to the inflation pipe. The transmission pipe and the inflation pipe are respectively equipped with pressure transmitters, and the inflation pipe is connected to the inflation mechanism. The method includes the following steps: 1. Installation and connection of components; 2. Monitoring of normal working conditions; 3. Detection of faults. The device adopts pneumatic transmission to replace electrical components and connecting wires to realize monitoring and fault detection of the operating conditions of the breathing valve, and will not generate electrical short circuits or electric sparks. It has good safety. The method can be used to implement centralized monitoring of all breathing valves in the tank area, and can automatically detect the performance of the valve disc movement regularly, and timely discover and handle faults such as valve disc adhesion and jamming.

Description

Technical Field

[0001] The invention relates to the field of petrochemical equipment and automation control, and in particular to an online monitoring device and a monitoring method for a safety breathing valve. Background Art

[0002] As an important accessory to protect the safety of storage tanks, the breathing valve is a safe and energy-saving device that maintains the air pressure balance of the storage tank and reduces the volatilization of the medium. The breathing valve is generally installed on the top of the storage tank, and uses the positive and negative pressure valve disc to automatically control the exhaust and intake of the storage tank, so that the air pressure inside and outside the tank is balanced, thereby protecting the storage tank. In the past, when testing the breathing valve, maintenance and repair personnel usually disassembled and inspected it regularly at the installation site, or disassembled it and transported it to the manufacturer for testing and maintenance. The testing cycle was long, the cost was high, the labor intensity was high, and the data storage and analysis could not be completed.

[0003] At present, the existing online testing system for tank breathing valves in China can perform regular online testing and self-inspection on the breathing valves, but its signal transmission method is electrical signal transmission. Since electrical equipment or components such as travel switches and communication modules need to be installed on the breathing valves, electrical short circuits, electric sparks and other hazards may occur during use, which is not conducive to the safety of the tanks and is difficult to realize productization. Summary of the invention

[0004] The purpose of the present invention is to provide a safe breathing valve online monitoring device and monitoring method. The technical problems that the present invention needs to solve are: 1. Using pneumatic transmission to eliminate the risk of sparks in the storage tank; 2. Realizing online monitoring and fault detection of the breathing valve when the breathing valve is in operation, and improving the operation management and maintenance efficiency of the breathing valve while ensuring safety.

[0005] The design concept of the present invention is: 1. A set of monitoring interfaces are installed on each side of the exhalation end valve disc and the inhalation end valve disc that contact the corresponding valve seat. Each set of monitoring interfaces is connected to the inflation pipeline and the inflation mechanism through a transmission pipe. Pneumatic components are used to replace the electrical components and connecting wires in the prior art to prevent electrical short circuits or electric sparks generated by electrical components; 2. A pneumatic transmission pipe is used to replace the electrical signal transmission in the prior art, and the working condition of the breathing valve is monitored by measuring and analyzing the air pressure and its changes in the transmission pipe; 3. A detection command is issued manually or automatically by the monitoring mechanism to check whether the valve disc can be opened normally.

[0006] To achieve the above object, the technical solution of the present invention is:

[0007] A safety type breathing valve online monitoring device comprises a monitoring interface, a transmission pipe, a pressure transmitter, a one-way valve, an inflation pipe, an inflation mechanism and a monitoring mechanism. The device is provided with a set of monitoring interfaces on the side where the exhalation end valve disc of the breathing valve contacts the exhalation end valve seat, and on the side where the inhalation end valve disc contacts the inhalation end valve seat. Each set of monitoring interfaces is respectively connected to the corresponding transmission pipe, the other end of the transmission pipe is connected to the output end of the one-way valve, the input end of the one-way valve is connected to the inflation pipe, the transmission pipe and the inflation pipe are respectively provided with pressure transmitters, and the inflation pipe is connected to the inflation mechanism.

[0008] The monitoring interface in the device includes a valve and an air chamber, and the valve opens or closes synchronously with the action of the corresponding expiratory end valve disc or inspiratory end valve disc. The number of monitoring interfaces in each group is generally 1-12, preferably 3-6.

[0009] The pressure transmitter and the inflation mechanism in the device are connected to the monitoring mechanism via data lines respectively.

[0010] A method for online monitoring of a safety breathing valve, the method comprising the following steps:

[0011] 1. Installation and connection of components: A set of monitoring interfaces are installed on the side where the expiratory end valve disc and the expiratory end valve seat of the breathing valve are in contact, and on the side where the inhalation end valve disc and the inhalation end valve seat are in contact. Each set of monitoring interfaces is connected to the corresponding transmission pipe, and the other end of the transmission pipe is connected to the output end of the one-way valve. The input end of the one-way valve is connected to the inflation pipe. Pressure transmitters are installed on the transmission pipe and the inflation pipe respectively. The inflation pipe is connected to the inflation mechanism. The pressure transmitter and the inflation mechanism are connected to the monitoring mechanism with data cables respectively.

[0012] 2. Monitoring of normal working conditions: Under normal circumstances, the valve disc at the exhalation end and the valve disc at the inhalation end of the breathing valve are both in a closed state, and the valve in the monitoring interface is also in a closed state. The inflation pipe injects compressed air of set air pressure into the transmission pipe through a one-way valve to maintain a certain working air pressure in the air chamber in the transmission pipe and the monitoring interface; the working air pressure under normal circumstances is generally 0.12MPa~2.50MPa, and the preferred working air pressure is 0.15MPa~0.50MPa. The normal fluctuation range of air pressure generally does not exceed ±5%;

[0013] When the expiratory end valve disc or the inspiratory end valve disc of the breathing valve is opened, the valve in the corresponding monitoring interface is opened synchronously, and the compressed air in the air chamber of the transmission pipe and the monitoring interface is released rapidly. Since the air supply of the one-way valve is lower than the compressed air release speed, the air pressure in the transmission pipe drops. When the air pressure in the transmission pipe drops beyond the normal fluctuation range, the monitoring mechanism displays that the working state of the expiratory end valve disc or the inspiratory end valve disc is open;

[0014] When the expiratory end valve disc or the inspiratory end valve disc of the breathing valve is closed, the valve in the corresponding monitoring interface is closed synchronously, and the inflation mechanism injects compressed air into the transmission pipe and the air chamber in the monitoring interface through the inflation pipe and the one-way valve. The air pressure in the transmission pipe and the air chamber in the monitoring interface gradually rises to the normal working air pressure and tends to be stable. The monitoring mechanism displays that the working state of the expiratory end valve disc or the inspiratory end valve disc is closed;

[0015] 3. Fault detection: During fault detection, the inflation mechanism increases the air pressure in the inflation pipe according to the set program, and the compressed gas is injected into the air chamber in the transmission pipe and the monitoring interface through the one-way valve. When the air pressure in the air chamber in the monitoring interface reaches or exceeds the detection pressure, the corresponding expiratory end valve disc and / or inhalation end valve disc are pushed open by the pressure generated by the compressed air, and the compressed air in the air chamber in the monitoring interface and the transmission pipe is quickly released. By analyzing the air pressure and its changes in the transmission pipe and the inflation pipe, check whether the expiratory end valve disc and / or the inhalation end valve disc can be opened normally. The detection pressure is generally 0.20MPa to 2.50MPa, preferably 0.50MPa to 1.00MPa;

[0016] During use, the monitoring mechanism is connected to the pressure transmitter and the inflation mechanism through a data line. The monitoring mechanism is used to receive, store, and display the air pressure and its changes in the transmission pipe and the inflation pipe, analyze the operating conditions of the breathing valve, display fault information and send out sound and light alarm signals when a fault occurs, and complete the fault detection function by manually or periodically issuing test instructions.

[0017] Compared with the prior art, the present invention has the following positive effects:

[0018] 1. The device adopts pneumatic transmission to replace the electrical components and connecting wires in the prior art to monitor the operating conditions of the breathing valve and detect faults. Therefore, no electrical short circuit or electric spark will occur during the working process, which has good safety.

[0019] 2. The device can be used to monitor the working condition of the breathing valve online. When injecting or extracting the medium into the tank, it can prevent the tank from being damaged due to excessive pressure difference between the inside and outside. It can also manually or regularly automatically detect the performance of the valve disc at the exhalation end and the valve disc at the inhalation end, so as to timely discover and deal with valve disc adhesion, blocking and other faults;

[0020] 3. This method can use a set of inflation mechanism and inflation pipeline to monitor multiple nearby breathing valves in parallel, saving equipment investment and reducing construction difficulty;

[0021] 4. This method can be used to network multiple monitoring devices through wired or wireless communication networks, so that all breathing valves in the tank area can be centrally monitored, and data can be shared with third-party systems such as production scheduling management systems to improve the level of information management. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 , Schematic diagram of the connection of the online monitoring device for the safety breathing valve;

[0023] Figure 2 , Installation and connection diagram of the online monitoring device for safety breathing valve Figure 1 ;

[0024] Figure 3 , Installation and connection diagram of the online monitoring device for safety breathing valve Figure 2 .

[0025] In the figure: 1. expiratory end valve seat, 2. expiratory end valve disc, 3. inhalation end valve seat, 4. inhalation end valve disc, 101. monitoring interface, 102. transmission pipe, 103. pressure transmitter, 104. one-way valve, 105. inflation pipe, 106. inflation mechanism, 201. data line, 202. monitoring mechanism. DETAILED DESCRIPTION

[0026] The technical solution of the present invention is further described clearly and completely below in conjunction with the accompanying drawings and embodiments.

[0027] See attached Figure 1-2 The device is provided with a set of monitoring interfaces 101 on the side where the expiratory end valve disc 2 contacts the expiratory end valve seat 1, and on the side where the inhalation end valve disc 4 contacts the inhalation end valve seat 3. Each set of monitoring interfaces 101 is respectively connected to the corresponding transmission pipe 102. The other end of the transmission pipe 102 is connected to the output end of the one-way valve 104. The input end of the one-way valve 104 is connected to the inflation pipe 105. The transmission pipe 102 and the inflation pipe 105 are respectively provided with pressure transmitters 103. The inflation pipe 105 is connected to the inflation mechanism 106.

[0028] The monitoring interface 101 in the device includes a valve and an air chamber, and the valve is opened or closed synchronously with the action of the corresponding expiratory end valve disc 2 or inspiratory end valve disc 4. The number of each group of monitoring interfaces 101 is generally 1 to 12.

[0029] The pressure transmitter 103 and the inflation mechanism 106 in the device are connected to the monitoring mechanism 202 via data lines 201 respectively.

[0030] The method for online monitoring of safety breathing valves includes the following steps:

[0031] 1. Installation and connection of components: A set of monitoring interfaces 101 are installed on the side where the expiratory end valve disc 2 and the expiratory end valve seat 1 of the breathing valve are in contact, and on the side where the inhalation end valve disc 4 and the inhalation end valve seat 3 are in contact. Each set of monitoring interfaces 101 is respectively connected to the corresponding transmission pipe 102. The other end of the transmission pipe 102 is connected to the output end of the one-way valve 104. The input end of the one-way valve 104 is connected to the inflation pipe 105. The transmission pipe 102 and the inflation pipe 105 are respectively equipped with pressure transmitters 103. The inflation pipe 105 is connected to the inflation mechanism 106. The pressure transmitter 103 and the inflation mechanism 106 are respectively connected to the monitoring mechanism 202 by a data line 201.

[0032] 2. Monitoring of normal working conditions: Under normal circumstances, the valve disc 2 at the exhalation end and the valve disc 4 at the inhalation end of the breathing valve are both in a closed state, and the valve in the monitoring interface 101 is also in a closed state. The inflation pipe 105 injects compressed air of a set air pressure into the transmission pipe 102 through the one-way valve 104, so that a certain working air pressure is maintained in the air chambers in the transmission pipe 102 and the monitoring interface 101; the working air pressure is generally 0.12MPa to 2.50MPa, and the normal fluctuation range of the air pressure generally does not exceed ±5%;

[0033] When the expiratory end valve disc 2 or the inspiratory end valve disc 4 of the breathing valve is opened, the corresponding valve in the monitoring interface 101 is opened synchronously, and the compressed air in the air chamber of the transmission pipe 102 and the monitoring interface 101 is released rapidly. Since the air supply of the one-way valve 104 is lower than the compressed air release speed, the air pressure in the transmission pipe 102 drops. When the air pressure in the transmission pipe 102 drops beyond the normal fluctuation range, the monitoring mechanism 202 displays that the working state of the expiratory end valve disc 2 or the inspiratory end valve disc 4 is open.

[0034] When the expiratory end valve disc 2 or the inspiratory end valve disc 4 of the breathing valve is closed, the valve in the corresponding monitoring interface 101 is closed synchronously, and the compressed air is injected into the transmission tube 102 and the air chamber in the monitoring interface 101 through the inflation tube 105 and the one-way valve 104 by the inflation mechanism 106. The air pressure in the air chamber in the transmission tube 102 and the monitoring interface 101 gradually rises to the normal working air pressure and tends to be stable, and the monitoring mechanism 202 shows that the working state of the expiratory end valve disc 2 or the inspiratory end valve disc 4 is closed;

[0035] 3. Fault detection: During fault detection, the inflation mechanism 106 increases the air pressure in the inflation tube 105 according to the set program, and the compressed gas is injected into the air chambers in the transmission tube 102 and the monitoring interface 101 through the one-way valve 104. When the air pressure in the air chamber in the monitoring interface 101 reaches or exceeds the detection air pressure, the corresponding expiratory end valve disc 2 and / or inhalation end valve disc 4 are pushed open by the pressure generated by the compressed air, and the compressed air in the air chamber in the monitoring interface 101 and the transmission tube 102 is quickly released. By analyzing the air pressure and its changes in the transmission tube 102 and the inflation tube 105, it is checked whether the expiratory end valve disc 2 and / or the inhalation end valve disc 4 can be opened normally. The detection air pressure is generally 0.20MPa to 2.50MPa.

[0036] During use, the monitoring mechanism 202 is connected to the pressure transmitter 103 and the inflation mechanism 106 via the data line 201. The monitoring mechanism 202 is used to receive, store, and display the air pressure and its changes in the transmission tube 102 and the inflation tube 105, analyze the operating conditions of the breathing valve, display fault information and send out sound and light alarm signals when a fault occurs. The monitoring mechanism 202 can complete the fault detection function by manually or automatically issuing test instructions.

[0037] Embodiment 1

[0038] Under normal circumstances, the exhalation end valve disc 2 and the inhalation end valve disc 4 of the breathing valve are both in a closed state, and the valve in the monitoring interface 101 is also in a closed state. The inflation tube 105 injects compressed air of a set air pressure into the transmission tube 102 through the one-way valve 104, so that a certain working air pressure is maintained in the air chambers in the transmission tube 102 and the monitoring interface 101. The working air pressure is generally 0.12MPa to 2.50MPa, preferably 0.15MPa to 0.50MPa, and the normal fluctuation range of the air pressure generally does not exceed ±5%.

[0039] When the expiratory end valve disc 2 or the inspiratory end valve disc 4 of the breathing valve is opened, the corresponding valve in the monitoring interface 101 is opened synchronously, and the compressed air in the air chamber of the transmission pipe 102 and the monitoring interface 101 is released rapidly. Since the air supply of the one-way valve 104 is lower than the compressed air release speed, the air pressure in the transmission pipe 102 decreases. When the air pressure in the transmission pipe 102 decreases beyond the normal fluctuation range, the monitoring mechanism 202 shows that the working state of the expiratory end valve disc 2 or the inspiratory end valve disc 4 is open.

[0040] When the expiratory end valve disc 2 or the inspiratory end valve disc 4 of the breathing valve is closed, the corresponding valve in the monitoring interface 101 is closed synchronously, and the inflation mechanism 106 injects compressed air into the air chambers in the transmission tube 102 and the monitoring interface 101 through the inflation tube 105 and the one-way valve 104. The air pressure in the air chambers in the transmission tube 102 and the monitoring interface 101 gradually rises to the normal working air pressure and tends to be stable. At this time, the monitoring mechanism 202 displays that the working state of the expiratory end valve disc 2 or the inspiratory end valve disc 4 is closed.

[0041] During fault detection, the inflation mechanism 106 increases the air pressure in the inflation tube 105 according to the set program, and the compressed gas is injected into the air chambers in the transmission tube 102 and the monitoring interface 101 through the one-way valve 104. When the air pressure in the air chamber in the monitoring interface 101 reaches or exceeds the detection air pressure, the corresponding expiratory end valve disc 2 and / or inhalation end valve disc 4 are pushed open by the pressure generated by the compressed air, and the compressed air in the air chamber in the monitoring interface 101 and the transmission tube 102 is rapidly released. By analyzing the air pressure and its changes in the transmission tube 102 and the inflation tube 105, it is checked whether the expiratory end valve disc 2 and / or the inhalation end valve disc 4 can be opened normally. The detection air pressure is generally 0.20MPa~2.50MPa, preferably 0.50MPa~1.00MPa.

[0042] During use, the monitoring mechanism 202 is connected to the pressure transmitter 103 and the inflation mechanism 106 via the data line 201, and is used to receive, store, and display the air pressure and its changes in the transmission tube 102 and the inflation tube 105, analyze the operating conditions of the breathing valve, display fault information and send out sound and light alarm signals when a fault occurs, and can also complete the fault detection function by manually or periodically issuing test instructions.

[0043] Embodiment 2

[0044] In actual working conditions, the appropriate inflation mechanism 106 and inflation pipe 105 in the prior art can be selected according to the number of breathing valves, pipeline volume and other parameters, and multiple breathing valves equipped with monitoring interfaces 101 are connected in parallel to the pipeline of the inflation pipe 105 through the corresponding transmission pipes 102 and one-way valves 104 (see Appendix Figure 3 ), multiple pressure transmitters 103 are correspondingly installed on the pipelines of each transmission pipe 102 and the inflation pipe 105, so that multiple breathing valves share a set of inflation mechanisms 106 and inflation pipes 105. Its working principle is the same as that of the first embodiment.

[0045] All features disclosed in this specification, or combinations of all disclosed components, except for mutually exclusive features and / or steps, can be combined in any manner. Any feature disclosed in this specification (including claims and abstract), unless otherwise stated, can be replaced by other equivalent or alternative features with similar purposes. That is, unless otherwise stated, each feature is only an example of a series of equivalent or similar features.

[0046] The above is only a non-limiting implementation mode of the present invention, and a large number of embodiments can be derived. For ordinary technicians in this field, without departing from the creative concept of the present invention and without making creative work, several modified and improved embodiments can be made, which all fall within the protection scope of the present invention.

Claims

1. A method for online monitoring of a safety breathing valve, characterized in that: The method comprises the following steps: (1) Installation and connection of components: A set of monitoring interfaces (101) is installed on the side where the exhalation end valve disc (2) and the exhalation end valve seat (1) are in contact, and on the side where the inhalation end valve disc (4) and the inhalation end valve seat (3) are in contact. Each set of monitoring interfaces (101) is respectively connected to a corresponding transmission pipe (102). The other end of the transmission pipe (102) is connected to the output end of the one-way valve (104). The input end of the one-way valve (104) is connected to the inflation pipe (105). Pressure transmitters (103) are respectively installed on the transmission pipe (102) and the inflation pipe (105). The inflation pipe (105) is connected to the inflation mechanism (106). The pressure transmitter (103) and the inflation mechanism (106) are respectively connected to the monitoring mechanism (202) by a data line (201). (2) Monitoring of normal working conditions: Under normal circumstances, the valve disc (2) at the exhalation end and the valve disc (4) at the inhalation end of the breathing valve are both in a closed state, and the valve in the monitoring interface (101) is also in a closed state. The inflation pipe (105) injects compressed air of a set air pressure into the transmission pipe (102) through the one-way valve (104), so that a certain working air pressure is maintained in the air chamber in the transmission pipe (102) and the monitoring interface (101). The working air pressure is 0.12MPa to 2.50MPa, and the normal fluctuation range of the air pressure does not exceed ±5%; When the exhalation end valve disc (2) or the inhalation end valve disc (4) of the breathing valve is opened, the valve in the corresponding monitoring interface (101) is opened synchronously, and the compressed air in the air chamber of the transmission pipe (102) and the monitoring interface (101) is released rapidly. Since the air supply of the one-way valve (104) is lower than the compressed air release speed, the air pressure in the transmission pipe (102) decreases. When the air pressure in the transmission pipe (102) decreases beyond the normal fluctuation range, the monitoring mechanism (202) displays that the working state of the exhalation end valve disc (2) or the inhalation end valve disc (4) is open; When the exhalation end valve disc (2) or the inhalation end valve disc (4) of the breathing valve is closed, the valve in the corresponding monitoring interface (101) is closed synchronously, and the compressed air is injected into the air chamber of the transmission tube (102) and the monitoring interface (101) through the inflation tube (105) and the one-way valve (104) by the inflation mechanism (106), and the air pressure in the air chamber of the transmission tube (102) and the monitoring interface (101) gradually rises to the normal working air pressure and tends to be stable, and the monitoring mechanism (202) displays that the working state of the exhalation end valve disc (2) or the inhalation end valve disc (4) is closed; (3) Fault detection: During fault detection, the inflation mechanism (106) increases the air pressure in the inflation tube (105) according to a set program, and the compressed gas is injected into the air chambers in the transmission tube (102) and the monitoring interface (101) through the one-way valve (104). When the air pressure in the air chamber in the monitoring interface (101) reaches or exceeds the detection air pressure, the corresponding expiratory end valve disc (2) and / or inhalation end valve disc (4) are pushed open by the pressure generated by the compressed air, and the compressed air in the air chamber in the monitoring interface and the transmission tube (102) is quickly released. By analyzing the air pressure and its changes in the transmission tube (102) and the inflation tube (105), it is checked whether the expiratory end valve disc (2) and / or the inhalation end valve disc (4) can be opened normally. The detection air pressure is 0.20MPa to 2.50MPa. During use, the monitoring mechanism (202) is connected to the pressure transmitter (103) and the inflation mechanism (106) via the data line (201). The monitoring mechanism (202) is used to receive, store, and display the air pressure and its changes in the transmission tube (102) and the inflation tube (105), analyze the operating conditions of the breathing valve, display fault information and issue an audible and visual alarm signal when a fault occurs, and complete the fault detection function by manually or regularly issuing a test command.

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