KR20190051872A - Apparatus and method for supporting maintenance of valve - Google Patents

Abstract

In particular, the efficiency of maintenance work of the valve is improved with respect to handling of the bellows valve.
The valves of the maintenance candidates are the bellows valves A, C, and M (S201). Information about the maximum frictional force of the bellows valves A, C, and M is calculated as the diagnostic index F of the bellows valves A, C, and M based on the openness measurement data D1 and the pressure measurement data D2 of the bellows valves A, , And presents it to the operator as an index indicating the suspicion of bellows breakage (S203 to S206). If the calculated diagnostic index F is less than or equal to the diagnostic index threshold value, the bellows valve is determined as a valve requiring maintenance (a valve suspected to be broken in the bellows) and presented to the operator (S208 to S210).

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a valve maintenance support apparatus,

The present invention relates to a valve maintenance assisting apparatus and method for supporting a bellows valve having a bellows type bellows (bellows seal) provided so as to surround the outer circumference of a valve shaft coupled to a valve body.

[0003] Valves used in plants of petroleum and chemical industries in the past have to be particularly careful about safety, and therefore, regular maintenance is performed. Fig. 12 shows an example of a valve (control valve) used in a petroleum and chemical plant.

The valve 100 includes a valve body 101, a positioner 102, and an actuator 103. The actuator 103 has a spring type diaphragm structure and displaces the diaphragm 103a of the diaphragm 103a against the force of the spring 103b in accordance with the air pressure Po supplied from the positioner 102, (Stem) 104 is moved up and down to adjust the opening degree of the valve (the gap between the valve body 105 and the seat ring 106). That is, it regulates the flow of the fluid.

The positioner 102 detects the lift position of the valve shaft 104, that is, the actual opening degree of the valve, from the rotational angle position of the feedback lever 107 connected to the valve shaft 104, And supplies the air pressure Po corresponding to the difference in degrees to the manipulating device 103. [

In this valve 100, a bellows type bellows (bellows seal) 108 is provided on the outer periphery of the valve shaft 104 coupled to the valve body 105 to prevent external leakage of the fluid. The bellows 108 is made of a metal material having corrosion resistance and is provided so as to surround the outer circumference of the valve shaft 104 in a lower flange 109 connected to the valve body 101.

In the lower flange 109, the bellows 108 has a bellows ring 111 fitted to the valve shaft 104, and a bellows flange 112 interposed between the lower flange 109 and the upper flange 110 Respectively. A gland packing 113 is provided in the upper flange 110 between the outer circumferential surface of the valve shaft 104 and the inner circumferential surface of the upper flange 110 to further prevent leakage of the fluid.

A valve 100 having such a bellows type bellows 108 is called a bellows valve (for example, see Patent Document 1). Hereinafter, the bellows valve is denoted by reference symbol VB to distinguish it from the valve 100 of another type. In the following description, the valve 100 refers to a valve including a bellows valve VB.

In addition, the valve 100 may be provided with a reverse operation actuator or a manual operation actuator. The inverse operation actuator presses the opening degree of the valve in the closing direction by the force of the spring, like the bellows valve VB shown in Fig. In the case of the normal operation device, the opening degree of the valve is urged in the opening direction by the force of the spring. In the bellows valve VB shown in Fig. 12, although the actuator 103 is operated by the air pressure, there is a type in which the actuator 103 is operated by the hydraulic pressure.

In a plant equipped with such a valve, it is necessary to efficiently maintain a large number of valves. In order to improve the efficiency of the maintenance work, valve stick slip detection (see, for example, Patent Document 2), valve hunting detection (Refer to Document 3), and detection of valve scale attachment (see, for example, Patent Document 4).

Japanese Patent Application Laid-Open No. 2007-154929 Japanese Patent No. 3254624 Japanese Patent Application Laid-Open No. 2015-114942 Japanese Patent Application Laid-Open No. 2015-114943

However, there is no upper limit that can be said to be complete or sufficient regarding safety and maintenance efficiency. A large number of valves such as a petroleum and chemical plant are used. Therefore, the efficiency of the maintenance work is required to be further improved.

An object of the present invention is to provide a valve maintenance support apparatus and method capable of improving a maintenance operation efficiency of a valve, particularly when handling a bellows valve have.

In order to achieve the above object, the present invention provides a bellows valve for a bellows valve that includes a bellows-shaped bellows provided to surround the outer periphery of a valve shaft, The valve maintenance support apparatus 200 according to the present invention is a valve maintenance support apparatus 200 for measuring the opening degree of a bellows valve that is supplied from an opening degree measurement section 21 for measuring the degree of opening of a bellows valve, (1) for storing pressure measurement data (D2) transmitted from a pressure measuring unit (22) for measuring a pressure Po of the pressure measurement unit A diagnostic index calculation section (3) for calculating information on the maximum frictional force of the bellows valve as a diagnostic index (F) of the bellows valve, And a diagnostic index presentation unit (4) for presenting a diagnostic index of the delivered bellows valve.

In the present invention, the measured value data storage unit stores the measured value data of the opening degree from the opening degree measurement unit and the pressure measurement value data from the pressure measurement unit. The diagnostic index calculator calculates information on the maximum frictional force of the bellows valve as a diagnostic index of the bellows valve, based on the openness measurement value data and the pressure measurement data stored in the measurement data storage.

In the bellows valve, when a break occurs in the bellows (a hole is bored in the bellows), the force of distorting the bellows is reduced. The reduction in the force for distorting the bellows is represented by a decrease in the maximum frictional force of the bellows valve (the maximum frictional force occurring between the valve shaft and the bellows valve), and the diagnostic index of the bellows valve thus calculated is reduced. The diagnostic index of the calculated bellows valve is presented to the operator as an indicator of the suspicion of the bellows rupture.

In the above description, the constituent elements in the drawings corresponding to the constituent elements of the invention are indicated by reference numerals with parentheses.

As described above, according to the present invention, the information on the maximum frictional force of the bellows valve is calculated as the diagnostic index of the bellows valve on the basis of the openness measurement value data and the pressure measurement data, and the calculated index of the bellows valve, It is possible to improve the maintenance efficiency of the valve when handling the bellows valve, especially when the bellows valve is handled.

Fig. 1 is a diagram showing a state before compression of the bellows and a state after compression when the rupture does not occur.
Fig. 2 is a diagram showing a state before compression of the bellows and a state after compression when the rupture is generated.
3 is a block diagram showing the configuration of the main part of the valve maintenance support apparatus according to the first embodiment of the present invention.
4 is a flowchart showing a state in which the measured value data of the opening degree and the measured pressure value data are accumulated in the measured value data storage unit of the valve maintenance support apparatus.
5 is a diagram exemplifying a change in valve opening degree (?) And air pressure (Po) in one up-and-down movement when the valve operating device is an inverse operating actuator.
6 is a diagram exemplifying a change in valve opening degree (?) And a change in air pressure (Po) in one up-and-down movement in a case where a manipulating device of a valve is a coarse manipulating device.
7 is a flowchart for explaining the operation of the valve maintenance support apparatus.
Fig. 8 is an image diagram showing an example of a valve arrangement of a plant to be maintained. Fig.
9 is a diagram showing a change in the maximum frictional force of the valve (bellows valve) over time.
10 is a diagram showing a display example of a diagnosis index of a maintenance candidate valve (bellows valve).
11 is a diagram exemplifying a plant according to the second embodiment of the present invention and a configuration of the device management system (the mounting example of the first embodiment).
12 is a diagram showing an example of a control valve (bellows valve).

[Principle of the invention]

The inventor has noted that, in the case of a bellows valve using a bellows (bellows seal), when the bellows is partially broken (a hole is formed in the bellows), a force for distorting the bellows is reduced.

In other words, when a break is generated with respect to a force required to distort the entire bellows in a normal bellows, a force for elastically deforming the broken portion is not required properly. Therefore, a total amount necessary to distort the bellows The power of the power source decreases. For example, when the bellows is distorted like a compression spring, a force for elastically deforming the opening portion caused by the breaking is unnecessary.

Fig. 1 schematically shows the state before and after compression of the bellows in the case where no breakage occurs. Fig. 1 (a) shows the state before compression, and Fig. 1 (b) shows the state of the bellows after compression. If there is no break in the bellows, a force of single line strain is required at all bending points.

Fig. 2 shows a state before compression of the bellows and a state after compression when the rupture occurs. When the bellows is broken, a force for elastically deforming is not required at the broken portion (opening portion), and the force for distorting the bellows is reduced.

The decrease in the force for distorting the bellows appears as a decrease in the maximum frictional force of the bellows valve (the maximum frictional force occurring between the valve shaft and the valve shaft), considering the attachment state of the bellows. The inventor has conceived that it is possible to estimate whether or not there is a doubt in the bellows by presenting information on the maximum frictional force of the bellows valve to the operator as a diagnostic index of the bellows valve. This makes it possible to improve the efficiency of the maintenance work of the valve, especially when handling the bellows valve.

[Embodiment 1]

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. 3 is a block diagram showing the configuration of the main part of the valve maintenance support apparatus according to the first embodiment of the present invention. Here, in order to simplify the explanation, it is assumed that the case of the ID (identification information) of the valve is simpler than that used in the actual plant.

The valve maintenance support apparatus 200 of the present embodiment is implemented by a hardware consisting of a processor and a storage device and a program for realizing various functions in cooperation with the hardware, and includes a measurement data storage section 1, A diagnostic index calculation unit 3, a diagnostic index presentation unit 4, a determination unit 5, a threshold storage unit 6, and a determination result presentation unit 7 are provided.

In the valve maintenance support apparatus 200, the measured value data D1 stored in the measured value data storage unit 1 and the pressure measurement data D1 transmitted from the open degree measurement unit 21 of the valve 100 used in the plant 22) of the pressure measurement value data D2.

That is, the valve 100 used in the plant has an opening degree measuring section 21 for measuring the opening degree? Of the valve, a pressure measuring section 22 for measuring the air pressure Po supplied to the operation device of the valve, . The opening degree measurement section 21 transmits the measured degree of opening? To the valve maintenance assist device 200 as the degree of opening measurement data D1 and the pressure measurement section 22 measures the measured air pressure Po To the valve maintenance support apparatus 200 as the pressure measurement data D2.

When the valve maintenance support apparatus 200 receives the opening degree measurement data D1 from the opening degree measurement section 21 (YES in step S101) as shown in the flowchart of FIG. 4, (Step S102). When receiving the pressure measurement data D2 from the pressure measurement section 22 (YES in step S103), the CPU 11 stores the measurement data D1 And stores the measured pressure value data D2 in the measured value data storage unit 1 (step S104).

5 shows the valve opening degree? (Opening degree measured value data D1) and the air pressure Po (pressure measurement data (?)) In one up-and-down movement when the operation device of the valve 100 is the inverse operation device. 6 shows an example of the change of the valve opening degree [theta] (the opening degree measurement data D1) in one up-and-down movement in the case where the operation device of the valve 100 is a coarse manipulating device, The change of the air pressure Po (pressure measurement data D2) is exemplified.

In the present embodiment, the measured value data D1 and the measured pressure value data D2 are stored in the measured value data storage unit 1 from the opening degree measurement unit 21 and the pressure measurement unit 22 of the valve 100 It is periodically transmitted and accumulated as time-series data.

In the present embodiment, a large number of valves 100 including a bellows valve VB (Fig. 12) are provided in the plant, and the degree of opening from the valves 100-1 to 100- It is assumed that the measurement data D1 (D1 _{1 to} D1 _N ) and the pressure measurement data D2 (D2 _{1 to} D2 _N ) are accumulated in the measurement data storage unit 1 in association with the ID of the valve.

Hereinafter, with reference to the flowchart shown in Fig. 7, the operation of the valve maintenance support apparatus 200 will be described in detail while exchanging the functions of the respective parts.

The operator sets the valves of the maintenance candidates among the valves 100-1 to 100-N to be measured as the measurement targets of the valves 100-1 to 100-N installed in the plant, (Step S201).

In this case, the ID of the valve registered as the maintenance candidate valve (hereinafter also referred to as the valve ID) is stored in the valve ID storage unit 2 of the valve maintenance support apparatus 200.

For example, it is assumed that there are 26 valves 100 in the plant, and "A", "B", "C", ..., "M" , &Quot; Y ", and " Z " When valves A, M, and C are defined as maintenance candidate valves, the operator inputs "A", "M", and "C" as valve IDs.

In the present embodiment, it is assumed that the valves A, M, and C are the bellows valves VB as shown in FIG. 12 and are selected as the top maintenance objects in the specific periodical plant maintenance. Hereinafter, valves A, M and C are also referred to as bellows valves A, M and C, respectively.

Fig. 8 is an image diagram showing an example of a valve arrangement of a plant to be maintained. Fig. In this embodiment, the valve 100-A (bellows valve A) and the valve 100-M (bellows valve M) of the valve IDs "A" and "M" And the valve 100-C (bellows valve C) having the valve ID " C " is disposed in the flow path 11-3 having the flow path ID " 3 ".

In Fig. 8, 12-A, 12-C, and 12-M are flow meters, 13 is a tank, and 14 is a pressure transmitter. In Fig. 8, the description of valves having valve IDs other than " A ", " C ", and " M " is omitted.

A, C, and M of the maintenance candidate candidate valve stored in the valve ID storage unit 2, if there is an instruction to calculate the diagnostic index (YES in step S202) (Step S203), and the opening degree measurement data D1 and the pressure measurement value data (hereinafter referred to as " pressure measurement data ") stored in the measurement value data storage unit 1 in association with the read valve IDs " A ", & D2) (step S204).

The diagnostic index calculator 3 calculates the maximum frictional force of the bellows valves A, C, and M based on the openness measurement data D1 and the pressure measurement data D2 read from the measurement data storage unit 1 (F _A , F _C , F _M ) of the bellows valves A, C, and M (step S205).

Fig. 9 shows a change in the maximum frictional force of the bellows valve with time. The diagnostic index calculator 3 calculates the diagnostic index 3 based on the air pressure Po supplied to the manipulator required for increasing the degree of opening of the bellows valve at the same opening degree and the air pressure Po supplied to the manipulator required for decreasing the opening degree of the bellows valve The pressure difference between the supplied air pressure Po and the maximum frictional force is obtained as information on the maximum frictional force and the information on the maximum frictional force is set as the diagnostic index F of the bellows valve. For example, the immediately preceding 24 hours may be regarded as the diagnosis target period, information on the maximum frictional force within the diagnosis target period may be obtained as information on the present maximum frictional force, information on the present maximum frictional force may be transmitted to the diagnostic index F of the bellows valve do.

The diagnostic indices F (F _A , F _C , and F _M ) calculated by the diagnostic index calculator 3 are sent to the diagnostic index presentation unit 4. The diagnostic index display unit 4 presents the diagnostic index F from the diagnostic index calculator 3 to the operator as an index of the maintenance candidate valve (bellows valve), that is, as an index indicating the suspicion of bellows rupture (step S206 ).

For example, the IDs " A "," C ", and " M " of the maintenance candidate valves are associated with the bellows valves A, The numerical values of the diagnostic indices F _A , F _C , and F _M calculated by the diagnostic index calculator 3 are displayed on the display.

At this time, the diagnostic indices F _A , F _C , and F _M presented (displayed) in the diagnostic indication presentation area # 1 are indicated by the bellows valves A and C (Indicating) the state of the bellows mounted on the bellows, it is possible to quantitatively indicate the necessity of attention to the bellows to the operator who lacks knowledge on the necessity of maintenance of the bellows. Therefore, It is possible to reduce the risk of omission.

The diagnostic indexes F (F _A , F _C , and F _M ) calculated by the diagnostic index calculation unit 3 are also sent to the determination unit 5. In the threshold value storage unit 6, the lower limit value of the normal range for the diagnostic index F is stored as the diagnostic index threshold value Fth.

When the diagnostic index F is sent from the diagnostic index calculation unit 3, the judgment unit 5 reads the diagnostic index threshold value Fth stored in the threshold value storage unit 6 (step S207), and the diagnostic index calculation unit 3 Is compared with the diagnostic index threshold value Fth (step S208). In this case, the diagnostic indexes F _A , F _C , and F _M from the diagnostic index calculator 3 are compared with the diagnostic index threshold Fth.

Here, when the diagnostic index F from the diagnostic index calculation unit 3 is equal to or less than the diagnosis index threshold value Fth (YES in step S208), the determination unit 5 determines that the valve (bellows valve) is a valve requiring maintenance (Step S209). For example, it is determined that the diagnostic indicator _A F, F _C, F _M wherein diagnostic indicator when F _M that was diagnostic indicator threshold Fth or less, the bellows valve M of the valve requires maintenance. The judgment section (5) sends the judgment result to the judgment result presentation section (7).

The determination result presentation unit 7 presents the determination result from the determination unit 5 to the operator (step S210). For example, when it is determined that the bellows valve M among the bellows valves A, C, and M, which are valves of maintenance candidates, is a valve that requires maintenance, suspicion of breakage of the bellows in the presentation area # 1 of the diagnostic index shown in Fig. The valve ID of the bellows valve M and the diagnostic index F _M are displayed in red. In this case, the valve IDs of the bellows valves A and C and the diagnostic indices F _A and F _C are displayed in black. At this time, the diagnostic index threshold value Fth used at the time of determination may be displayed in the display area # 1 of the diagnostic index.

In this embodiment, the diagnosis indexes of the maintenance candidate valves (bellows valves A, C, and M) and the determination results of whether or not the valves are maintenance-required are displayed on the display. However, they may be output to a printer or the like, .

In this embodiment, the diagnostic index F is calculated only for the valves (bellows valves A, C, and M) of the maintenance candidate in the diagnostic index calculator 3. However, , The diagnostic index F may be calculated.

In this case, in the diagnostic index display unit 4, the valve IDs of all the valves to be measured are associated with the diagnostic index F, and for example, the valves for the maintenance candidates are displayed in blue and the valves for maintenance candidates are displayed in black , And the valves that are determined to require maintenance are displayed in red as shown in FIG.

The diagnosis index threshold Fth may be appropriately determined depending on the degree of risk of breakage and the tradeoff between the risk caused by the breakage of the bellows and the maintenance cost. Further, the diagnostic index threshold Fth may be determined on the basis of the frictional force when the sliding distance accumulation value assumed to have no fracture is small (initial state).

[Embodiment 2]

Next, a valve maintenance support apparatus according to a second embodiment of the present invention will be described. The second embodiment describes a mounting example of the first embodiment. Fig. 11 is a diagram showing a configuration of a plant and its equipment management system, and the same components as those in Fig. 8 are denoted by the same reference numerals.

The plant of petroleum and chemical industry is provided with a device management system 8 for controlling and managing each device of the plant. With respect to the measurement data storage unit 1, the valve ID storage unit 2, the diagnostic index calculation unit 3, the determination unit 5, and the threshold value storage unit 6 described in the first embodiment, It is preferable to mount it on the device management system 8 side.

On the other hand, the diagnosis index presentation unit 4 and the determination result presentation unit 7 are, in principle, provided with a process that is particularly required when determining the maintenance of the valve. In addition, the maintenance person (the person in charge of the job of the maintenance management company) is generally entrusted by the plant owner company and carries out the maintenance of the plant. Therefore, on the assumption that the plant is an unspecified number of plants, the diagnostic indicator presentation unit 4 and the determination result presentation unit 7 are mounted on the portable computer 9 carried by the task person (operator) of the maintenance management company .

The computer 9 has a central processing unit (CPU), a memory and an interface. The plant management system 8 and the computer 9 of the plant are temporarily connected to each other using a communication function such as Ethernet (registered trademark) at the time of performing maintenance work.

When the operator starts the application software on the computer 9, the CPU of the computer 9 executes a process in accordance with the program stored in the memory, sends an instruction to calculate the diagnostic index to the device management system 8, (Bellows valve) of the maintenance candidate registered in the maintenance terminal 8 to determine whether or not the diagnosis index is required to be calculated and maintained. The diagnosis index of the maintenance candidate valve (bellows valve) calculated in the device management system 8 and the determination result of whether or not maintenance is required are displayed on the display of the computer 9. [

In this example, it is assumed that the maintenance candidate valve (bellows valve) is already registered in the device management system 8. However, the registration or change of the maintenance candidate valve (bellows valve) It is also possible to do.

The operator confirms the valve (bellows valve) to be careful in the inspection of the bellows, based on the diagnosis index of the maintenance candidate valve (bellows valve) displayed on the display of the computer 9 and the judgment result of whether or not maintenance is necessary. The operator releases the connection between the computer 9 and the device management system 8.

In this manner, the valve maintenance support apparatus 200 described in the first embodiment can be applied to an actual plant.

[Extension of Embodiment]

Although the present invention has been described with reference to the above embodiments, the present invention is not limited to the above embodiments. Various changes and modifications can be made by those skilled in the art within the scope of the technical idea of the present invention.

1: Measurement data storage unit 2: Valve ID storage unit 3: Diagnostic index calculation unit 4: Diagnostic index presentation unit 5: Threshold storage unit 6: Threshold storage unit 7: And a control valve for controlling the pressure of the fluid flowing through the valve body and the pressure of the fluid flowing through the valve body. 200: Valve maintenance support device.

Claims (6)

A valve maintenance assisting device for supporting maintenance work of a bellows valve having a bellows type bellows provided to surround an outer periphery of a valve shaft coupled to a valve body,
Measurement value data for storing pressure measurement data transmitted from a pressure measurement section for measuring openness measurement data transmitted from an opening degree measurement section for measuring the opening degree of the bellows valve and fluid pressure supplied to an operation device for driving the bellows valve, A storage unit,
A diagnostic index calculator for calculating information on the maximum frictional force of the bellows valve as a diagnostic index of the bellows valve based on the opening degree measurement data and the pressure measurement data stored in the measurement data memory,
A diagnostic index display unit for displaying the diagnostic index of the bellows valve calculated by the diagnostic index calculating unit,
And a control unit for controlling the valve. The method according to claim 1,
A threshold value storage unit for storing a lower limit value of the normal range for the diagnostic index as a diagnostic index threshold value;
A determination unit that determines that the bellows valve is a valve requiring maintenance if the diagnostic index of the bellows valve calculated by the diagnostic index calculation unit is less than or equal to the diagnosis index threshold;
A determination result presentation unit for presenting the bellows valve determined to be necessary for maintenance by the determination unit
And a control unit for controlling the valve. The diagnosis apparatus according to claim 1 or 2,
The pressure of the fluid pressure supplied to the manipulator required when increasing the opening degree of the bellows valve at the same opening degree and the fluid pressure supplied to the manipulator required for reducing the opening degree of the bellows valve Wherein the diagnosis index of the bellows valve is calculated by using the vehicle as information on the maximum frictional force of the bellows valve. 3. The system according to claim 1 or 2, wherein the diagnostic-
Wherein the diagnosis index is combined with the diagnosis index of the bellows valve to suggest that the diagnosis index is targeted at the state of the bellows mounted on the bellows valve. 3. The method according to claim 1 or 2,
And a valve identification information storage unit for storing identification information of the bellows valve registered as the valve of the maintenance candidate,
Wherein the measured value data storage section stores,
A plurality of valves including the valve of the maintenance candidate are to be measured and the opening degree measurement data and the pressure measurement data are stored in association with the valve identification information for each valve to be measured,
Wherein the diagnostic index calculator comprises:
The control unit reads the identification information of the valve of the maintenance candidate stored in the valve identification information storage unit and stores the valve opening information in the storage unit in association with the read identification information to the opening degree measurement data stored in the measurement value data storage unit and the pressure measurement data And the diagnosis index is calculated for each valve of the maintenance candidate based on the diagnosis index. A valve maintenance support method for supporting a bellows valve having a bellows type bellows provided to surround an outer periphery of a valve shaft coupled to a valve body,
Pressure measurement data transmitted from a pressure measurement section for measuring the opening measurement value data transmitted from the opening degree measurement section for measuring the opening degree of the bellows valve and the fluid pressure supplied to the operation device for driving the bellows valve, In a storage unit,
A diagnostic index calculation step of calculating information on the maximum frictional force of the bellows valve as a diagnostic index of the bellows valve based on the opening degree measurement data and the pressure measurement data stored in the measurement data storage,
A diagnostic index presentation step of presenting a diagnosis index of the bellows valve calculated by the diagnostic index calculation step
Wherein the valve maintenance support method comprises:

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