JP6033007B2 - Valve self-excited vibration evaluation apparatus and valve self-excited vibration evaluation method - Google Patents

Description

  The present invention relates to a valve self-excited vibration evaluation apparatus and a valve self-excited vibration evaluation method for evaluating self-excited vibration of a flow control valve when a flow control valve is applied to piping.

  In general, when designing a piping system, the flow control function is often required in designing the piping system, and by installing a flow control valve in the piping system and setting a variable pipe resistance, the above Fulfill the demands of However, since the flow regulating valve reduces the pressure in the piping system and converts the energy of the fluid into other energy such as vibration and heat, fatigue failure and noise due to vibration using the valve as an excitation source occur. There is a case.

  Conventionally, for example, Patent Document 1 describes performing performance evaluation of valves used in piping systems of various plants. The valve performance evaluation method described in Patent Document 1 measures the three-dimensional shape inside a pipe and a valve used in a plant, and then creates a database of the three-dimensional shape inside the pipe and the valve. The target valve and piping are extracted from the 3D shape database and the target valve and piping are combined. Then, the computational fluid dynamics method is applied to the valve-piping model, and the target of performance evaluation is applied. A Cv value is calculated, and then a database of the calculated Cv value is created. Furthermore, the valve performance evaluation method described in Patent Document 1 applies a computational fluid dynamics method to the valve-pipe model, calculates the cavitation coefficient of the valve, and then determines the presence or absence of cavitation from the cavitation coefficient. Next, the occurrence of self-excited vibration of the valve is predicted by using different calculation formulas of critical flow velocities depending on the presence or absence of cavitation.

JP 2012-032168 A

  As described in Patent Document 1 described above, systematic examination on the vibration of the valve prevents vibration caused by cavitation. However, the vibration of the valve is not only due to cavitation, but also, for example, self-excited vibration generated by the valve body continuously contacting the valve seat due to the fluid gap flow between the valve body and the valve seat. There is a strong desire to evaluate self-excited vibration at the design stage. In addition, although it is shown in patent document 1 that generation | occurrence | production of a self-excited vibration is shown, the self-excited vibration in patent document 1 originates in cavitation.

  This invention solves the subject mentioned above, and it aims at providing the valve self-excited vibration evaluation apparatus and valve self-excited vibration evaluation method which can evaluate the self-excited vibration of a flow regulating valve.

  In order to achieve the above object, the valve self-excited vibration evaluation apparatus according to the first invention is selected according to a self-excited vibration database having a self-excited vibration characteristic map corresponding to various flow control valves and a predetermined piping system. The self-excited vibration characteristic map of the flow control valve is acquired from the self-excited vibration database, and the self-excited vibration of the flow control valve when the selected flow control valve is applied to a predetermined use condition. And a control unit for determining the presence or absence of occurrence.

  According to this valve self-excited vibration evaluation device, the flow control valve can be evaluated by determining whether or not self-excited vibration of the flow control valve selected according to a predetermined piping system has occurred.

  In the valve self-excited vibration evaluation device according to the second invention, in the first invention, when the selected flow regulating valve generates self-excited vibration, the control unit applies a measure for preventing the self-excited vibration. It is characterized by.

  According to this valve self-excited vibration evaluation device, when self-excited vibration is generated in the flow rate adjusting valve, a design that prevents the self-excited vibration can be performed by taking measures to prevent this.

  A valve self-excited vibration evaluation device according to a third aspect of the present invention is the first or second aspect of the present invention, further comprising a cavitation database having a cavitation characteristic map corresponding to the various flow rate regulating valves, and the control unit includes a predetermined piping system The cavitation characteristic map of the flow rate adjustment valve selected according to the flow rate is obtained from the cavitation database, and whether or not cavitation of the flow rate adjustment valve occurs when applied to the usage conditions of the selected flow rate adjustment valve. It is characterized by determining.

  According to this valve self-excited vibration evaluation apparatus, it is determined whether or not the self-excited vibration of the flow rate adjusting valve selected according to the predetermined piping system has occurred, and the flow rate adjusting valve selected according to the predetermined piping system By determining the presence or absence of the occurrence of cavitation, the flow rate adjustment valve can be evaluated.

  The valve self-excited vibration evaluation device according to a fourth aspect of the present invention is characterized in that, in the third aspect, when the selected flow regulating valve generates cavitation, the control unit applies a measure for preventing cavitation. .

  According to this valve self-excited vibration evaluation device, when self-excited vibration occurs in the flow rate adjustment valve, it is possible to perform a design that prevents self-excited vibration by taking measures to prevent this, and in the flow rate adjustment valve, When cavitation occurs, a design that prevents cavitation can be performed by taking measures to prevent this.

  In order to achieve the above object, the valve self-excited vibration evaluation method of the fifth invention uses a valve self-excited vibration evaluation apparatus including a self-excited vibration database having self-excited vibration characteristic maps corresponding to various flow rate adjusting valves. A valve self-excited vibration evaluation method, wherein a self-excited vibration characteristic map of the flow rate adjusting valve selected according to a predetermined piping system is acquired from the self-excited vibration database, and the selected flow rate adjusting valve is The method includes a step of determining whether or not self-excited vibration of the flow rate adjusting valve is generated when applied to a use condition.

  According to this valve self-excited vibration evaluation method, the flow control valve can be evaluated by determining whether or not self-excited vibration of the flow control valve selected according to a predetermined piping system has occurred.

  The valve self-excited vibration evaluation method of the sixth invention further includes a step of applying a measure for preventing self-excited vibration when the selected flow regulating valve generates self-excited vibration in the fifth invention. Features.

  According to this valve self-excited vibration evaluation method, when self-excited vibration is generated in the flow rate adjusting valve, a design that prevents the self-excited vibration can be performed by taking measures to prevent this.

  The valve self-excited vibration evaluation method according to a seventh aspect of the present invention is the valve self-excited vibration evaluation device according to the fifth or sixth aspect, further comprising a cavitation database having a cavitation characteristic map in the various flow rate regulating valves. The cavitation characteristic map of the flow regulating valve selected according to the piping system is acquired from the cavitation database, and the occurrence of cavitation of the flow regulating valve when applied to the usage conditions of the selected flow regulating valve. The method further includes a step of determining presence or absence.

  According to this valve self-excited vibration evaluation method, it is determined whether or not the self-excited vibration of the flow rate adjusting valve selected according to the predetermined piping system has occurred, and the flow rate adjusting valve selected according to the predetermined piping system By determining the presence or absence of the occurrence of cavitation, the flow rate adjustment valve can be evaluated.

  The valve self-excited vibration evaluation method according to an eighth aspect of the present invention is the seventh aspect of the invention, in which the treatment for preventing cavitation is applied when the selected flow regulating valve generates cavitation under the use condition of the predetermined piping system. The method further includes a step.

  According to this valve self-excited vibration evaluation method, when self-excited vibration occurs in the flow regulating valve, it is possible to perform a design that prevents self-excited vibration by taking measures to prevent this, and When cavitation occurs, a design that prevents cavitation can be performed by taking measures to prevent this.

  According to the present invention, the self-excited vibration of the flow regulating valve can be evaluated.

FIG. 1 is a configuration diagram of a valve self-excited vibration evaluation apparatus according to Embodiment 1 of the present invention. FIG. 2 is a schematic diagram showing a system diagram of the piping system. FIG. 3 is a conceptual diagram of a self-excited vibration characteristic map of a self-excited vibration database included in the storage unit of the valve self-excited vibration evaluation apparatus according to Embodiment 1 of the present invention. FIG. 4 is a conceptual diagram of a self-excited vibration characteristic map of a self-excited vibration database included in the storage unit of the valve self-excited vibration evaluation apparatus according to Embodiment 1 of the present invention. FIG. 5 is a conceptual diagram of a self-excited vibration characteristic map of a self-excited vibration database included in the storage unit of the valve self-excited vibration evaluation apparatus according to Embodiment 1 of the present invention. FIG. 6 is a flowchart showing a processing procedure of the valve self-excited vibration evaluation device according to the first embodiment of the present invention. FIG. 7 is a flowchart showing a processing procedure of the valve self-excited vibration evaluation apparatus according to the modification of the first embodiment of the present invention. FIG. 8 is a configuration diagram of a valve self-excited vibration evaluation device according to Embodiment 2 of the present invention. FIG. 9 is a conceptual diagram of a cavitation characteristic map of a cavitation database included in the storage unit of the valve self-excited vibration evaluation device according to the second embodiment of the present invention. FIG. 10 is a conceptual diagram of a cavitation characteristic map of a cavitation database included in the storage unit of the valve self-excited vibration evaluation device according to the second embodiment of the present invention. FIG. 11 is a conceptual diagram of a cavitation characteristic map of a cavitation database included in the storage unit of the valve self-excited vibration evaluation device according to the second embodiment of the present invention. FIG. 12 is a flowchart showing a processing procedure of the valve self-excited vibration evaluation device according to the second embodiment of the present invention. FIG. 13: is a flowchart which shows the process sequence of the work plan assistance apparatus in the nuclear installation which concerns on the modification of Embodiment 2 of this invention.

  DESCRIPTION OF EMBODIMENTS Embodiments (embodiments) for carrying out the present invention will be described in detail with reference to the drawings. The present invention is not limited by the contents described in the following embodiments. The constituent elements described below include those that can be easily assumed by those skilled in the art and those that are substantially the same. Furthermore, the constituent elements described below can be appropriately combined.

[Embodiment 1]
FIG. 1 is a configuration diagram of a valve self-excited vibration evaluation apparatus according to the present embodiment, and FIG. 2 is a schematic diagram showing a system diagram of a piping system. The valve self-excited vibration evaluation apparatus 1 according to the present embodiment is for evaluating a flow rate adjusting valve 8 arranged in a pipe 7 as shown in FIG. 2 when designing various plants (for example, nuclear power generation facilities). is there.

  As shown in FIG. 1, the valve self-excited vibration evaluation device 1 includes a computer 2, an image display device (display unit) 5, and an input device 6. The computer 2 includes a control unit 3 and a storage unit 4. The control unit 3 is, for example, a CPU (Central Processing Unit). The control unit 3 receives an instruction or data input from the input device 6. As an example, the storage unit 4 is a hard disk device or a semiconductor storage device. The storage unit 4 may be connected to the computer 2 through a communication line (for example, a data server). The image display device 5 has a screen 5D, and displays an image, mainly a system diagram of the piping system to be designed (see FIG. 2), on the screen 5D. The input device 6 inputs use conditions of the flow rate adjusting valve 8 provided in the pipe 7 in the piping system to be designed. The operating conditions of the flow rate adjusting valve 8 mainly include a valve opening degree corresponding to the pipe flow rate and a valve differential pressure corresponding to the pipe pressure. In the present embodiment, the input device 6 includes a keyboard 6K and a mouse 6M, but the input device 6 is not limited to these.

  Here, in the system diagram of the piping system, as shown in FIG. 2, at least a pump 9 for circulating a fluid through the piping 7 is provided, and a flow rate adjusting valve 8 for adjusting the flow rate of the fluid is provided at the piping 7. Yes.

  In this embodiment, the valve self-excited vibration evaluation apparatus 1 uses the self-excited vibration database 4A to evaluate self-excited vibration of the flow rate adjusting valve 8 arranged in a predetermined piping system. The self-excited vibration database 4A is stored in the storage unit 4 of the valve self-excited vibration evaluation apparatus 1 as shown in FIG.

  3 to 5 are conceptual diagrams of self-excited vibration characteristic maps of a self-excited vibration database included in the storage unit of the valve self-excited vibration evaluation apparatus according to the present embodiment. The self-excited vibration database 4A has self-excited vibration characteristic maps S1, S2, and S3 corresponding to various flow rate adjusting valves, as shown in FIGS. In the present embodiment, examples of three self-excited vibration characteristic maps S1, S2, and S3 are shown in FIGS. The self-excited vibration characteristic maps S1, S2, and S3 are generated in the region A where self-excited vibration occurs and the self-excited vibration obtained by performing a test in advance in relation to the valve opening degree and the valve differential pressure of the flow regulating valve 8. A region B that is not to be displayed is shown. The self-excited vibration characteristic maps S1, S2, and S3 indicate a region C that is not confirmed in the test but is estimated that no self-excited vibration is generated because there is no gap flow between the valve body and the valve seat. . Although not clearly shown in the figure, the self-excited vibration characteristic maps S1, S2, and S3 are not automatically confirmed from other test conditions even if a gap flow exists between the valve body and the valve seat, although not confirmed in the test. The region where no excitation vibration is estimated is shown. The self-excited vibration is not generated based on cavitation, but refers to, for example, vibration generated by the valve body continuously contacting the valve seat due to the fluid gap flow between the valve body and the valve seat. .

  FIG. 6 is a flowchart showing a processing procedure of the valve self-excited vibration evaluation device according to the present embodiment. As shown in FIG. 6, first, the flow rate adjusting valve 8 applied to a predetermined piping system is selected (step S1). Selection of the flow rate adjusting valve 8 can be performed by the operator in consideration of, for example, the valve capacity and the flow rate adjustment width, depending on the flow rate and pressure of the piping system. Then, the operator inputs using the keyboard 6K of the input device 6, for example, in order to set the usage condition of the selected flow rate adjusting valve 8 (step S2). In addition, selection of the flow regulating valve 8 in step S1 can also select the thing suitable for the said use condition by setting the use condition of the flow control valve 8 in step S2. In this case, the storage unit 4 of the valve self-excited vibration evaluation apparatus 1 includes a flow rate adjustment valve database in which the flow rate adjustment valve 8 and its use conditions are associated with each other. The unit 3 reads the flow rate adjustment valve database from the storage unit 4 and selects the flow rate adjustment valve 8 corresponding to the use condition.

  When the use condition of the flow rate adjusting valve 8 is input in step S2, the control unit 3 reads the self-excited vibration database 4A from the storage unit 4 and the self-excited vibration characteristic map S1, corresponding to the selected flow rate adjusting valve 8. From S2 and S3, it is determined whether or not the self-excited vibration of the flow rate adjusting valve 8 is generated when the selected flow rate adjusting valve 8 is applied to the use conditions (step S3). That is, the control unit 3 applies the valve opening and the valve differential pressure, which are the use conditions of the flow rate adjusting valve 8, to the self-excited vibration characteristic maps S1, S2, and S3. Whether or not self-excited vibration is generated is determined based on whether or not each region A, B, and C in S2 and S3.

  As described above, the valve self-excited vibration evaluation apparatus 1 according to the present embodiment corresponds to the self-excited vibration database 4A having the self-excited vibration characteristic maps S1, S2, and S3 corresponding to the various flow rate adjusting valves 8 and a predetermined piping system. The self-excited vibration characteristic maps S1, S2, and S3 of the selected flow rate adjusting valve 8 are acquired from the self-excited vibration database 4A, and the flow rate adjustment when the selected flow rate adjusting valve 8 is applied to a predetermined use condition. And a control unit 3 that determines whether or not the self-excited vibration of the valve 8 is generated.

  Further, the valve self-excited vibration evaluation method of the present embodiment uses the valve self-excited vibration evaluation apparatus 1 including the self-excited vibration database 4A having the self-excited vibration characteristic maps S1, S2, and S3 corresponding to the various flow rate adjusting valves 8. This is a valve self-excited vibration evaluation method, wherein self-excited vibration characteristic maps S1, S2, S3 of the flow rate adjusting valve 8 selected according to a predetermined piping system are acquired from the self-excited vibration database 4A, and the selected flow rate adjustment is performed. A step of determining whether or not the self-excited vibration of the flow regulating valve 8 is generated when the valve 8 is applied to a predetermined use condition.

  According to the valve self-excited vibration evaluation device 1 and the valve self-excited vibration evaluation method, by determining whether or not self-excited vibration of the flow rate adjusting valve 8 selected according to a predetermined piping system has occurred, the flow rate adjusting valve 8 evaluations can be performed.

  FIG. 7 is a flowchart showing a processing procedure of the valve self-excited vibration evaluation device according to the modification of the present embodiment. In this modified example, the valve self-excited vibration evaluation device 1 of the present embodiment is used. As a processing procedure thereof, when self-excited vibration occurs as a result of self-excited vibration evaluation, a measure for preventing the self-excited vibration is performed. Do.

  As shown in FIG. 7, first, the flow rate adjusting valve 8 applied to a predetermined piping system is selected (step S1). Selection of the flow rate adjusting valve 8 can be performed by the operator in consideration of, for example, the valve capacity and the flow rate adjustment width, depending on the flow rate and pressure of the piping system. Then, the operator inputs using the keyboard 6K of the input device 6, for example, in order to set the usage condition of the selected flow rate adjusting valve 8 (step S2). In addition, selection of the flow regulating valve 8 in step S1 can also select the thing suitable for the said use condition by setting the use condition of the flow control valve 8 in step S2. In this case, the storage unit 4 of the valve self-excited vibration evaluation apparatus 1 includes a flow rate adjustment valve database in which the flow rate adjustment valve 8 and its use conditions are associated with each other. The unit 3 reads the flow rate adjustment valve database from the storage unit 4 and selects the flow rate adjustment valve 8 corresponding to the use condition.

  When the use condition of the flow rate adjusting valve 8 is input in step S2, the control unit 3 reads the self-excited vibration database 4A from the storage unit 4 and the self-excited vibration characteristic map S1, corresponding to the selected flow rate adjusting valve 8. From S2 and S3, it is determined whether or not the self-excited vibration of the flow rate adjusting valve 8 is generated when the selected flow rate adjusting valve 8 is applied to the use conditions (step S3). That is, the control unit 3 applies the valve opening and the valve differential pressure, which are the use conditions of the flow rate adjusting valve 8, to the self-excited vibration characteristic maps S1, S2, and S3. Whether or not self-excited vibration is generated is determined based on whether or not each region A, B, and C in S2 and S3.

  As a result of determining whether or not self-excited vibration has occurred in step S3, when self-excited vibration occurs (step S4: Yes), the control unit 3 performs a measure to prevent self-excited vibration (step S5). Specifically, an orifice is arranged at a site on the downstream side of the fluid of the flow rate adjusting valve 8 in the pipe 7. The orifice generates a differential pressure in the piping system. In order to reduce the differential pressure burden of the flow rate adjusting valve 8, the orifice is self-excited, for example, by increasing the valve opening degree under the use condition of the flow rate adjusting valve 8. Prevent vibration. Thus, the measure for preventing self-excited vibration reduces the differential pressure burden on the flow regulating valve. In order to reduce the differential pressure burden on the flow rate adjusting valve, the diameter of the pipe 7 or the head of the pump 9 may be lowered without being limited to the installation of the orifice. Further, as a measure for preventing self-excited vibration, the pipe 7 and the flow rate adjusting valve 8 may be physically and firmly pressed so as to suppress the vibration itself. Further, the flow rate adjusting valve 8 may be replaced with another one. And after performing the measure which prevents self-excited vibration in step S5, this process is complete | finished. On the other hand, as a result of determining whether or not self-excited vibration is generated in step S3, when the self-excited vibration is not generated (step S4: No), this process is ended.

  Thus, in the valve self-excited vibration evaluation device 1 of the present embodiment, when the selected flow rate adjusting valve 8 generates self-excited vibration, the control unit 3 applies a measure for preventing self-excited vibration.

  In addition, the valve self-excited vibration evaluation method of the present embodiment further includes a step of applying a measure for preventing self-excited vibration when the selected flow regulating valve 8 generates self-excited vibration.

  According to the valve self-excited vibration evaluation device 1 and the valve self-excited vibration evaluation method, when self-excited vibration is generated in the flow rate adjusting valve 8, a design is performed to prevent the self-excited vibration by taking measures to prevent this. It becomes possible.

[Embodiment 2]
FIG. 8 is a configuration diagram of the valve self-excited vibration evaluation device according to the present embodiment. In addition to the first embodiment, the valve self-excited vibration evaluating apparatus 1 of the present embodiment is different in that the cavitation of the flow rate adjusting valve 8 arranged in a predetermined piping system is evaluated using the cavitation database 4B. Therefore, in the second embodiment described below, the same parts as those in the first embodiment are denoted by the same reference numerals, and the description thereof is omitted.

  As shown in FIG. 8, the valve self-excited vibration evaluation device 1 includes a computer 2, an image display device (display unit) 5, and an input device 6. The computer 2 includes a control unit 3 and a storage unit 4. The storage unit 4 stores a self-excited vibration database 4A and a cavitation database 4B.

9 to 11 are conceptual diagrams of cavitation characteristics maps of a cavitation database included in the storage unit of the valve self-excited vibration evaluation device according to the present embodiment. The cavitation database 4B has cavitation characteristic maps C1, C2, and C3 corresponding to various flow rate adjustment valves, as shown in FIGS. In the present embodiment, examples of three cavitation characteristic maps C1, C2, and C3 are shown in FIGS . The cavitation characteristic maps C1, C2, and C3 indicate the relationship between the cavitation coefficient of the flow rate adjusting valve 8 and the valve opening. 9 to 11, “●” is a critical cavitation coefficient, and indicates a cavitation coefficient that causes cavitation that generates maximum vibration with the opening of the valve. Further, “Δ” is an initial cavitation coefficient, and indicates a cavitation coefficient at which cavitation starts to occur with the valve opening. “■” is a choke cavitation coefficient, and indicates a cavitation coefficient that causes cavitation when the valve opening is choked.

  FIG. 12 is a flowchart showing a processing procedure of the valve self-excited vibration evaluation device according to the present embodiment. As shown in FIG. 12, first, the flow rate adjusting valve 8 applied to a predetermined piping system is selected (step S1). Selection of the flow rate adjusting valve 8 can be performed by the operator in consideration of, for example, the valve capacity and the flow rate adjustment width, depending on the flow rate and pressure of the piping system. Then, the operator inputs using the keyboard 6K of the input device 6, for example, in order to set the usage condition of the selected flow rate adjusting valve 8 (step S2). In addition, selection of the flow regulating valve 8 in step S1 can also select the thing suitable for the said use condition by setting the use condition of the flow control valve 8 in step S2. In this case, the storage unit 4 of the valve self-excited vibration evaluation apparatus 1 includes a flow rate adjustment valve database in which the flow rate adjustment valve 8 and its use conditions are associated with each other. The unit 3 reads the flow rate adjustment valve database from the storage unit 4 and selects the flow rate adjustment valve 8 corresponding to the use condition.

  When the use condition of the flow rate adjusting valve 8 is input in step S2, the control unit 3 reads the cavitation database 4B from the storage unit 4, and from the cavitation characteristic maps C1, C2, C3 corresponding to the selected flow rate adjusting valve 8. Then, it is determined whether or not cavitation occurs in the flow rate adjusting valve 8 when the selected flow rate adjusting valve 8 is applied to the use conditions (step S11). That is, the control unit 3 calculates the cavitation coefficient of the selected flow regulating valve 8 and applies the cavitation coefficient to the cavitation characteristic maps C1, C2, and C3. Determine whether cavitation has occurred.

  Next, the control unit 3 reads the self-excited vibration database 4A from the storage unit 4, and selects the selected flow regulating valve 8 from the self-excited vibration characteristic maps S1, S2, S3 corresponding to the selected flow regulating valve 8. Whether or not the self-excited vibration of the flow rate adjusting valve 8 is generated when applied to the use conditions is determined (step S3). That is, the control unit 3 applies the valve opening and the valve differential pressure, which are the use conditions of the flow rate adjusting valve 8, to the self-excited vibration characteristic maps S1, S2, and S3. Whether or not self-excited vibration is generated is determined based on whether or not each region A, B, and C in S2 and S3. In addition, the process of step S3 and step S11 may be reverse order.

  As described above, the valve self-excited vibration evaluation device 1 according to the present embodiment further includes the cavitation database 4B having the cavitation characteristic maps C1, C2, and C3 corresponding to the various flow rate adjusting valves 8, and the control unit 3 includes predetermined piping. The cavitation characteristic maps C1, C2, and C3 of the flow rate adjusting valve 8 selected according to the system are acquired from the cavitation database 4B and applied to the use conditions of the selected flow rate adjusting valve 8. Determine whether cavitation has occurred.

  Further, in the valve self-excited vibration evaluation method of the present embodiment, the valve self-excited vibration evaluation device 1 further includes a cavitation database 4B having cavitation characteristic maps C1, C2, and C3 in various flow rate regulating valves 8, and a predetermined piping system. The cavitation characteristics map C1, C2, C3 of the flow rate adjusting valve 8 selected according to the above is acquired from the cavitation database 4B, and the cavitation of the flow rate adjusting valve 8 when applied to the usage conditions of the selected flow rate adjusting valve 8 is obtained. The method further includes the step of determining the presence or absence of the occurrence of.

  According to the valve self-excited vibration evaluation device 1 and the valve self-excited vibration evaluation method, it is determined whether or not the self-excited vibration of the flow rate adjusting valve 8 selected according to the predetermined piping system has occurred, and the predetermined piping system It is possible to evaluate the flow rate adjusting valve 8 by determining the presence or absence of the occurrence of cavitation in the flow rate adjusting valve 8 selected according to the above.

  FIG. 13 is a flowchart illustrating a processing procedure of the valve self-excited vibration evaluation device according to the modification of the present embodiment. In this modification, the valve self-excited vibration evaluation device 1 of the present embodiment is used, and as a processing procedure, when cavitation occurs as a result of the evaluation of cavitation, a measure for preventing the cavitation is performed. In this modified example, when self-excited vibration occurs as a result of evaluation of the self-excited vibration, a measure for preventing the self-excited vibration is performed.

  As shown in FIG. 13, first, the flow rate adjustment valve 8 applied to a predetermined piping system is selected (step S1). Selection of the flow rate adjusting valve 8 can be performed by the operator in consideration of, for example, the valve capacity and the flow rate adjustment width, depending on the flow rate and pressure of the piping system. Then, the operator inputs the use condition of the selected flow rate adjusting valve 8 by using, for example, the keyboard 6K of the input device 6 (step S2). It should be noted that the flow rate adjustment valve 8 can be selected in step S1 by inputting the use condition of the flow rate adjustment valve 8 in step S2 and selecting a flow rate adjustment valve 8 that meets the use condition. In this case, the storage unit 4 of the valve self-excited vibration evaluation apparatus 1 includes a flow rate adjustment valve database in which the flow rate adjustment valve 8 and its use conditions are associated with each other. The unit 3 reads the flow rate adjustment valve database from the storage unit 4 and selects the flow rate adjustment valve 8 corresponding to the use condition.

  When the use condition of the flow rate adjusting valve 8 is input in step S2, the control unit 3 reads the cavitation database 4B from the storage unit 4, and from the cavitation characteristic maps C1, C2, C3 corresponding to the selected flow rate adjusting valve 8. Then, it is determined whether or not cavitation occurs in the flow rate adjusting valve 8 when the selected flow rate adjusting valve 8 is applied to the use conditions (step S11). That is, the control unit 3 calculates the cavitation coefficient of the selected flow regulating valve 8 and applies the cavitation coefficient to the cavitation characteristic maps C1, C2, and C3. Determine whether cavitation has occurred.

  As a result of determining whether or not cavitation has occurred in step S11, if cavitation occurs (step S12: Yes), the control unit 3 performs a measure to prevent cavitation (step S13). Specifically, an orifice is arranged at a site on the downstream side of the fluid of the flow rate adjusting valve 8 in the pipe 7. The orifice generates a differential pressure in the piping system, thereby reducing the differential pressure burden on the flow rate adjusting valve 8 and preventing the occurrence of cavitation. Thus, the measure for preventing cavitation reduces the differential pressure burden on the flow rate regulating valve. In order to reduce the differential pressure burden on the flow rate adjusting valve, the diameter of the pipe 7 or the head of the pump 9 may be lowered without being limited to the installation of the orifice. Further, as a measure for preventing cavitation, the pipe 7 and the flow rate adjustment valve 8 may be physically and firmly pressed so as to suppress vibration itself. Further, the flow rate adjusting valve 8 may be replaced with another one. Then, after the treatment for preventing self-excited vibration is performed in step S13, the process proceeds to step S3. On the other hand, as a result of determining whether or not self-excited vibration has occurred in step S11, if self-excited vibration does not occur (step S12: No), the process proceeds to step S3.

  Next, the control unit 3 reads the self-excited vibration database 4A from the storage unit 4, and selects the selected flow regulating valve 8 from the self-excited vibration characteristic maps S1, S2, S3 corresponding to the selected flow regulating valve 8. Whether or not the self-excited vibration of the flow rate adjusting valve 8 is generated when applied to the input use conditions is determined (step S3). That is, the control unit 3 applies the valve opening and the valve differential pressure, which are the use conditions of the flow rate adjusting valve 8, to the self-excited vibration characteristic maps S1, S2, and S3. Whether or not self-excited vibration is generated is determined based on whether or not each region A, B, and C in S2 and S3.

  As a result of determining whether or not self-excited vibration has occurred in step S3, when self-excited vibration occurs (step S4: Yes), the control unit 3 performs a measure to prevent self-excited vibration (step S5). Specifically, an orifice is arranged at a site on the downstream side of the fluid of the flow rate adjusting valve 8 in the pipe 7. The orifice generates a differential pressure in the piping system. In order to reduce the differential pressure burden of the flow rate adjusting valve 8, the orifice is self-excited, for example, by increasing the valve opening degree under the use condition of the flow rate adjusting valve 8. Prevent vibration. Thus, the measure for preventing self-excited vibration reduces the differential pressure burden on the flow regulating valve. In order to reduce the differential pressure burden on the flow rate adjusting valve, the diameter of the pipe 7 or the head of the pump 9 may be lowered without being limited to the installation of the orifice. Further, as a measure for preventing self-excited vibration, the pipe 7 and the flow rate adjusting valve 8 may be physically and firmly pressed so as to suppress the vibration itself. Further, the flow rate adjusting valve 8 may be replaced with another one. And after performing the measure which prevents self-excited vibration in step S5, this process is complete | finished. On the other hand, as a result of determining whether or not self-excited vibration is generated in step S3, when the self-excited vibration is not generated (step S4: No), this process is ended. Note that the order of the processes of Step S3 to Step S5 and Step S11 to Step S13 may be reversed. Moreover, by performing the process of step S13, the self-excited vibration may not occur. In such a case, the process of step S5 may not be performed. In addition, cavitation may not occur by performing the process of step S5. In such a case, the process of step S13 may not be performed.

  Thus, in the valve self-excited vibration evaluation device 1 of the present embodiment, when the selected flow regulating valve 8 generates cavitation, the control unit 3 applies a measure for preventing cavitation.

  In addition, the valve self-excited vibration evaluation method of the present embodiment further includes a step of applying a measure for preventing cavitation when the selected flow regulating valve 8 generates cavitation.

  According to the valve self-excited vibration evaluation device 1 and the valve self-excited vibration evaluation method, when self-excited vibration is generated in the flow rate adjusting valve 8, a design is performed to prevent the self-excited vibration by taking measures to prevent this. When cavitation occurs in the flow rate adjusting valve 8, it is possible to perform a design that prevents cavitation by taking measures to prevent this.

DESCRIPTION OF SYMBOLS 1 Valve self-excited vibration evaluation apparatus 2 Computer 3 Control part 4 Memory | storage part 4A Self-excited vibration database 4B Cavitation database 5 Image display apparatus 5D Screen 6 Input device 6K Keyboard 6M Mouse 7 Piping 8 Flow control valve 9 Pump S1, S2, S3 Self Excitation vibration characteristic map C1, C2, C3 Cavitation characteristic map

Claims (8)

A self-excited vibration database having a self-excited vibration characteristic map showing a region where self-excited vibration occurs and a region where self-excited vibration does not occur in relation to predetermined use conditions of various flow rate regulating valves;
The self-excited vibration characteristic map of the flow control valve selected according to a predetermined piping system is acquired from the self-excited vibration database, and the selected flow control valve is applied to a predetermined use condition. A control unit for determining whether or not self-excited vibration of the flow regulating valve is generated;
The valve self-excited vibration evaluation apparatus characterized by including.   The valve self-excited vibration evaluation device according to claim 1, wherein when the selected flow rate adjusting valve generates self-excited vibration, the control unit applies a measure for preventing the self-excited vibration. Further comprising a cavitation database having a cavitation characteristic map indicating the presence or absence of cavitation in relation to predetermined use conditions of the various flow rate regulating valves,
The control unit acquires the cavitation characteristic map of the flow rate adjustment valve selected according to a predetermined piping system from the cavitation database, and applies the flow rate when the selected flow rate adjustment valve is applied to use conditions. The valve self-excited vibration evaluation device according to claim 1 or 2, wherein the presence or absence of occurrence of cavitation of the regulating valve is determined.   The valve self-excited vibration evaluation device according to claim 3, wherein when the selected flow rate adjusting valve generates cavitation, the control unit applies a measure for preventing cavitation. A valve self-excited vibration evaluation apparatus including a self-excited vibration characteristic map having a self-excited vibration characteristic map indicating a region where self-excited vibration occurs and a region where self-excited vibration does not occur in relation to predetermined use conditions of various flow control valves. A valve self-excited vibration evaluation method to be used,
The flow rate when the self-excited vibration characteristic map of the flow regulating valve selected according to a predetermined piping system is acquired from the self-excited vibration database and the selected flow regulating valve is applied to a predetermined use condition. A method for evaluating self-excited vibration of a valve, comprising the step of determining whether self-excited vibration of a regulating valve has occurred.   6. The valve self-excited vibration evaluation method according to claim 5, further comprising a step of applying a measure for preventing the self-excited vibration when the selected flow regulating valve generates self-excited vibration. The valve self-excited vibration evaluation device further includes a cavitation database having a cavitation characteristic map indicating whether or not cavitation has occurred in relation to predetermined use conditions of the various flow rate regulating valves,
The cavitation characteristic map of the flow control valve selected according to a predetermined piping system is acquired from the cavitation database and applied to the use conditions of the selected flow control valve. The valve self-excited vibration evaluation method according to claim 5, further comprising a step of determining whether or not the occurrence has occurred.   The valve self-excited vibration according to claim 7, further comprising a step of applying a measure for preventing cavitation when the selected flow regulating valve generates cavitation under use conditions of the predetermined piping system. Evaluation method.

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