TW202235839A - Wear condition prediction device, prediction method, and prediction program - Google Patents

Abstract

The present invention addresses the problem of providing a prediction device, a prediction method, and a prediction program that make it possible to predict the wear condition of a seal member in a shaft seal device without disassembling the shaft seal device. In order to solve the problem described above, a prediction device, and a prediction method and a prediction program related to the prediction device are provided. The prediction device comprises a wear condition prediction means to which a shaft seal device is attached. The shaft seal device includes: a seal member including a fixed side member having a sliding surface and a rotary side member having a sliding surface; and a pressing part that applies pressing force so that the sliding surface of the fixed side member and the sliding surface of the rotary side member are in close contact. The wear condition prediction means predicts the wear condition of the seal member on the basis of a change in the pressure inside a fluid chamber in which a fluid moves. According to the present invention, it is possible to predict the wear condition of the seal member on the basis of a change in the pressure inside the fluid chamber due to the wear of the seal member. This makes it possible to accurately predict the wear condition of the seal member without disassembling the shaft seal device.

Description

Forecasting device, forecasting method and forecasting program

The present invention relates to a predicting device, predicting method and predicting program for predicting the wear state of a sealing member in a shaft sealing device. This application claims priority based on Japanese Patent Application No. 2021-025742 filed on February 19, 2021. The entire content of this Japanese application is incorporated by reference in this specification.

In general, a shaft seal is installed on the rotary shaft of a fluid machine for fluid transfer to prevent fluid inside the machine from leaking to the outside or gas (air) or liquid from outside the machine to flow into the machine.

As one of such shaft sealing devices, what is called a mechanical seal is known. A general mechanical seal is equipped with a sealing member composed of a rotating ring and a fixed ring. The elastic force of a spring such as a coil spring is used to make the rotating ring and the fixing ring in a state of close contact, and the rotating ring is driven to make it relatively Rotate, thereby improving the sealing performance of the sealing member and suppressing the leakage of fluid.

Here, the rotating ring in the mechanical seal rotates with the rotating shaft and rubs against the fixed ring, so the surfaces (sliding surfaces) that the rotating ring and the fixed ring are in close contact with each other gradually wear out. If the wear of the rotating ring or the fixed ring is serious, the tight contact between the rotating ring and the fixed ring cannot be maintained, the sealing performance is reduced, or cracks occur in the rotating ring or the fixed ring, thereby causing fluid leakage. Therefore, it is better to accurately grasp the state of the mechanical seal.

For example, Patent Document 1 describes a device that analyzes high-frequency vibrations generated by a mechanical seal using a high-frequency vibration sensor and evaluates the sliding state of the mechanical seal. [Prior Art Literature]

[Patent Document 1] Japanese Patent Laid-Open No. 62-226033

[Problem to be solved by the invention]

However, although the device described in Patent Document 1 has been improved so as not to be affected by noise generated by bearings other than the mechanical seal, fluid sound, etc., it may not be possible to completely remove the noise. Therefore, if one wants to use the device described in Patent Document 1 to grasp the state of the mechanical seal, there will be many problems in terms of conditions related to use or operation when it is practically used. Places that generate noise from other devices, etc.

Currently, means for accurately grasping the state of the mechanical seal from the outside has not yet been established, and the actual situation is to replace the mechanical seal periodically or after a fluid leak occurs. In particular, mechanical seals sometimes need to be disassembled for inspection and replacement, and high precision is also required for installation work, so there is a problem that the burden on operators involved in maintenance work is heavy. Therefore, it is sought to reduce the burden and reduce the burden on operators related to maintenance work by accurately judging the wear state of the seal member in the shaft seal device such as the mechanical seal from the outside to properly grasp the replacement time of the seal member. cost.

Therefore, an object of the present invention is to provide a prediction device, a prediction method, and a prediction program capable of predicting the wear state of a seal member in a shaft seal device without disassembling the shaft seal device. [Technical means to solve the problem]

As a result of intensive research by the present inventors on the above-mentioned subject, the focus is on a phenomenon that occurs when wear occurs in the seal member in the shaft seal device, that is, the pressure change inside the fluid chamber in which the shaft seal device is installed, The inventors have found that the wear state of the sealing member can be predicted based on this pressure change, and have completed the present invention. That is, the present invention is a prediction device, a prediction method, and a prediction program described below.

The prediction device of the present invention for solving the above-mentioned problems is a device for predicting the wear state of a sealing member in a shaft sealing device, and is characterized in that the shaft sealing device includes: a sealing member having a fixed side having a sliding surface The component and the rotating side member having a sliding surface; and the pressing part, which is pressed in such a manner that the sliding surface of the fixed side member and the sliding surface of the rotating side member are in close contact, the predicting device is provided with a wear state predicting means, The wear state predicting means predicts the wear state of the sealing member according to the pressure change inside the fluid chamber in which the shaft seal device is installed and the fluid moves inside. According to the predicting device of the present invention, the seal is predicted according to the pressure change that occurs inside the fluid chamber where the shaft sealing device is installed due to the wear of the sealing member (not the shaft sealing device itself) in the shaft sealing device. The wear state prediction means of the wear state of the member can accurately predict the wear state of the seal member without dismantling the shaft seal device, so that the replacement timing of the seal member can be properly grasped. In addition, it is possible to reduce the operator's burden and cost related to the maintenance work of the shaft sealing device.

Moreover, as an embodiment of the prediction device of the present invention, it is characterized by further comprising a wear state display unit for displaying the wear state of the sealing member. According to this feature, the operator can accurately grasp the state and wear tendency of the seal member in the shaft seal device, and can appropriately judge the subsequent response.

Furthermore, as an embodiment of the predicting device of the present invention, the wear state predicting means includes fluid temperature measuring means for measuring the temperature of the fluid. According to this feature, by measuring the temperature of the fluid itself moving in the fluid chamber, the temperature change of the fluid can be grasped, and the accompanying pressure change inside the fluid chamber can be easily detected, thereby applying it to the prediction of the wear state of the sealing member middle. In addition, the quality control of the fluid can be performed together with the prediction of the wear state of the sealing member.

Furthermore, as an embodiment of the predicting device of the present invention, the wear state predicting means includes fluid flow rate measuring means for measuring the flow rate of the fluid. According to this feature, by measuring the flow rate of the fluid itself moving inside the fluid chamber, it is possible to grasp the change in the flow rate of the fluid, and easily detect the accompanying pressure change inside the fluid chamber, thereby applying it to the wear state of the sealing member. Forecasting. In addition, the quality control of the fluid can be performed together with the prediction of the wear state of the sealing member.

In addition, as an embodiment of the prediction device of the present invention, it is characterized in that it further includes pressure detection means for detecting the degree of pressure of the pressure part. According to this feature, by further providing the pressing degree detection means, it is possible to grasp the force of the pressing part of the fixed side member and the rotating side member, so that the wear state of the sealing member can be predicted more accurately without disassembling the shaft seal device, thereby enabling The replacement timing of the sealing member can be grasped more appropriately. In addition, it is possible to further reduce the operator's burden and reduce the cost related to the maintenance work of the shaft sealing device.

The prediction method of the present invention to solve the above-mentioned problems is a method for predicting the wear state of a sealing member in a shaft sealing device, and is characterized in that the shaft sealing device includes: a sealing member having a fixed side with a sliding surface The component and the rotating side member having a sliding surface; and the pressing part, which is pressed in such a way that the sliding surface of the fixed side member and the sliding surface of the rotating side member are in close contact, the prediction method is provided with a wear state prediction step, In the wear state predicting step, the wear state of the sealing member is predicted from the pressure change inside the fluid chamber in which the shaft seal device is installed and the fluid moves inside. According to the prediction method of the present invention, the pressure of the sealing member is predicted based on the pressure change that occurs inside the fluid chamber in which the shaft sealing device is installed due to wear of the sealing member (not the shaft sealing device itself) in the shaft sealing device. In the wear state predicting step of the wear state, the wear state of the seal member can be accurately predicted without disassembling the shaft seal device, so that the replacement timing of the seal member can be appropriately grasped. In addition, it is possible to reduce the operator's burden and cost related to the maintenance work of the shaft sealing device.

The prediction program of the present invention to solve the above-mentioned problems is a program for predicting the wear state of a sealing member in a shaft sealing device, and is characterized in that the shaft sealing device includes: a sealing member having a fixed side having a sliding surface The member and the rotating side member having a sliding surface; and the pressing part, which is pressed in such a way that the sliding surface of the fixed side member and the sliding surface of the rotating side member are in close contact, the prediction program executes the wear state prediction process. In this wear state prediction process, the wear state of the sealing member is predicted from the pressure change occurring inside the fluid chamber in which the shaft seal device is installed and the fluid moves inside. According to the prediction program of the present invention, the sealing member is predicted by performing the prediction according to the pressure change occurring inside the fluid chamber in which the shaft sealing device is installed due to wear of the sealing member (not the shaft sealing device itself) in the shaft sealing device The wear state prediction processing of the wear state can accurately predict the wear state of the seal member without disassembling the shaft seal device, so that the replacement timing of the seal member can be appropriately grasped. In addition, it is possible to reduce the operator's burden and cost related to the maintenance work of the shaft sealing device. [Effect of Invention]

According to the present invention, it is possible to provide a prediction device, a prediction method, and a prediction program capable of predicting the wear state of a seal member in a shaft seal device without disassembling the shaft seal device.

Hereinafter, the prediction device, prediction method, and prediction program of the present invention will be described in detail with reference to the drawings. In addition, the predicting device described in the embodiment is merely an example for explaining the predicting device in the present invention, and is not limited thereto. In addition, the prediction method and prediction program of the present invention are replaced with the following description of the configuration and operation of the prediction device.

The present invention is a device, method and program for predicting the wear state of a sealing member in a shaft sealing device. Here, the shaft sealing device in the present invention is installed on a rotating shaft in various machines such as a fluid machine for transferring fluid to prevent fluid from leaking from inside the machine and fluid from flowing in from outside the machine. In addition, as the shaft sealing device in the present invention, as long as it includes a sealing member and a pressing part described later and can prevent fluid leakage in the rotating shaft, the specific configuration other than the sealing member and the pressing part is not particularly limited. . For example, the shaft seal device in the present invention includes those provided with various incidental structures known as mechanical seals. In addition, as a machine provided with the shaft sealing device in the present invention, as long as it has a rotating shaft and requires sealing performance in the rotating shaft, as long as it further includes a fluid chamber in which fluid moves inside, it is not particularly limited. limited. For example, a compressor, a slurry pump, etc. are mentioned as an apparatus which installs the shaft sealing device in this invention.

[The first embodiment] Fig. 1 is a schematic explanatory diagram showing the configuration of a shaft sealing device and a predicting device in a first embodiment of the present invention. As shown in Figure 1, the predicting device 1A in this embodiment is provided with a wear state predicting means 2, and the wear state predicting means 2 is aimed at the fluid chamber 102 installed in the machine 100 where the fluid moves inside and In the shaft sealing device 10 including the sealing member 20 and the pressing portion 30 , the wear state of the sealing member 20 is predicted based on the pressure change inside the fluid chamber 102 . In addition, in FIG. 1 , the right side with respect to the wall surface W of the machine 100 represents the housing 101 side of the machine, and is a rotary drive unit (not shown) connected to the rotary shaft R. On the other hand, the left side with respect to the wall surface W of the machine indicates the side of the fluid chamber 102 where the fluid moves.

The machine 100 in this embodiment is not particularly limited as long as it is equipped with a fluid chamber 102 and the shaft seal device 10 is installed. As shown in FIG. Take it as an example of a negative pressure state. Specific examples of the machine 100 include those in which powder and liquid are transferred in a state of agitation and mixing, such as a slurry pump, or examples in which powder and liquid are introduced and agitated and mixed, such as a dispersing device. In such a machine 100, it is preferable to maintain a negative pressure state in the fluid chamber 102 in order to quickly introduce the powder and ensure the mixing efficiency of the slurry and the stability of the slurry. In particular, when the machine 100 is a dispersing device (Jet Paster (registered trademark) manufactured by Nihon Spindle Manufacturing Co., Ltd., etc.) that disperses based on cavitation and shear force, in order to perform stable It is important to maintain the fluid chamber 102, which also functions as a mixing section for introducing powder and liquid, in a negative pressure state. In addition, the means for bringing the fluid chamber 102 into a negative pressure state is not particularly limited. For example, an example of connecting a decompression mechanism such as a decompression pump to the fluid chamber 102, or setting a cavitation-generating structure in the fluid chamber 102, and using the cavitation effect to make the inside of the fluid chamber 102 Examples of decompression due to fluid movement, etc.

As shown in FIG. 1 , the shaft sealing device 10 in this embodiment includes a sealing member 20 and a pressing portion 30. The sealing member 20 is provided on the rotating shaft R of the machine and has a fixed side member 21 having a sliding surface 21a. The pressing portion 30 presses the rotating side member 22 having the sliding surface 22 a such that the sliding surface 21 a of the fixed side member 21 and the sliding surface 22 a of the rotating side member 22 are in close contact with each other. In addition, the shaft sealing device 10 in the present embodiment makes the sliding surface 21a of the fixed-side member 21 and the sliding surface 22a of the rotating-side member 22 closely contact with the pressing portion 30, and improves the performance by driving the rotating-side member 22 to rotate. The sealing performance of the sealing member 20 can prevent the leakage and inflow of fluid from between the sliding surface 21a and the sliding surface 22a. Each configuration of the shaft sealing device 10 will be described below.

The sealing member 20 includes a fixed-side member 21 and a rotating-side member 22 . The fixed-side member 21 and the rotating-side member 22 are arranged coaxially and concentrically with the rotation axis R, and are arranged so that their sliding surfaces 21 a and 22 a face each other. As the fixed-side member 21 and the rotating-side member 22 in this embodiment, as long as the sliding surfaces 21a and 22a face each other, and the sliding surfaces 21a and 22a are relatively rotated and slid by the rotating drive of the rotating-side member 22, by It only needs to be able to prevent fluid leakage, and the specific structure is not particularly limited. For example, as shown in FIG. 1 , the following examples can be cited: the fixed side member 21 is configured to be able to move in the axial direction in the machine 100 by a housing 23 fixed to the fluid The moving fluid chamber 102 is separated from the wall surface W of the casing 101 . On the other hand, the rotating side member 22 is fixed to the rotating shaft R by the supporting member 24 . In addition, the fixed-side member 21 and the rotating-side member 22 in the present embodiment are not limited to the example shown in FIG. 1 , and known structures as a stationary ring and a rotating ring in mechanical seals may be used.

The materials of the fixed-side member 21 and the rotating-side member 22 are also not particularly limited, and materials generally used in mechanical seals may be used in consideration of mechanical strength, wear resistance, self-lubricating property, thermal conductivity, and the like. Specifically, for example, in addition to hard materials such as silicon carbide (SiC) and tungsten carbide (WC), other hard materials such as ceramics (chromium oxide or aluminum oxide) can be used. Also, those that can improve the lubricity of the sliding surface by providing a soft material such as carbon or resin on the surface of a hard material or a metal material (stainless steel, etc.).

The pressing portion 30 is used to press such that the sliding surface 21 a of the fixed-side member 21 and the sliding surface 22 a of the rotating-side member 22 come into close contact. The pressing portion 30 is not particularly limited as long as it is used to press the fixed-side member 21 or the rotating-side member 22 , and there are no particular limitations on the means or structure related to the pressing. For example, as the pressing part 30, as shown in FIG. 1, the example which uses the spring mechanism 31, such as a coil spring arrange|positioned in the case 23, is mentioned. At this time, in FIG. 1 , the fixed-side member 21 is pressed toward the rotating-side member 22 by the elastic force of the spring mechanism 31 . In addition, in FIG. 1, although the example which presses from the side of the fixed side member 21 toward the side of the rotation side member 22 is shown as the pressing part 30, it is not limited to this. As the pressing part 30, the example which presses from the rotation-side member 22 side toward the fixed-side member 21 side may be sufficient.

At this time, the pressing portion 30 is designed to apply a force P toward the fixed-side member 21 (or the rotating-side member 22) so that the sliding surface 21a of the fixed-side member 21 and the sliding surface 22a of the rotating-side member 22 maintain a close contact state and can Swipe relative to rotation.

In addition, the structure of the shaft sealing device 10 in this embodiment is not limited to the example shown in FIG. 1 . Fig. 2 is a schematic explanatory diagram showing another aspect of the shaft sealing device in this embodiment. For example, as shown in FIG. 2 , a support member 25 provided instead of the housing 23 to support the fixed side member 21 may be mentioned. The support member 25 is arranged such that the end portion on the side opposite to the side on which the fixed-side member 21 is arranged (the right side in FIG. 2 ) contacts the pressing portion 30 (spring mechanism 31 ). Thereby, the support member 25 is pressed by the pressing part 30 (spring mechanism 31), and the fixed-side member 21 is pressed toward the rotation-side member 22. As shown in FIG. In addition, the shape, number, and arrangement of the spring mechanisms 31 at this time are not particularly limited. As shown in FIG. 2 , it may be an example in which a plurality of spring mechanisms 31 are provided, or an example in which the entire support member 25 can be pressed by only one spring mechanism 31 may be used. Compared with the shaft sealing device 10 shown in FIG. 1 , the parts of the shaft sealing device 10 in FIG. 2 are simpler in structure, and thus have the advantage of being able to reduce costs related to manufacturing or assembly.

Here, the sealing member 20 of the shaft sealing device 10 is relatively rotating and sliding due to the sliding surfaces 21a and 22a of the fixed-side member 21 and the rotating-side member 22, so the sliding surface 21a and/or the sliding surface 22a will be gradually worn out with use. . If the sliding surface 21a and/or the sliding surface 22a in the sealing member 20 wears out, the close contact state between the fixed side member 21 and the rotating side member 22 will not be maintained, and the sealing performance of the sealing member 20 will decrease, resulting in fluid leakage. . In addition, the mechanical strength of the fixed-side member 21 and the rotating-side member 22 decreases due to abrasion of the seal member 20 , and cracks are likely to occur, thereby causing fluid leakage. Therefore, by predicting the wear state of the seal member 20 of the shaft sealing device 10 using the prediction device 1A in this embodiment, the maintenance work of the shaft sealing device 10 can be performed at an appropriate timing.

The predicting device 1A in this embodiment is provided with a wear state predicting means 2. The wear state predicting means 2 predicts the sealing member for the above-mentioned shaft sealing device 10 according to the pressure change of the fluid chamber 102 in which the fluid moves. The steps of the wear state.

If the wear of the sealing member 20 is severe, cracks are likely to occur in the fixed-side member 21 and/or the rotating-side member 22 due to the friction of the sliding surfaces 21a and 22a. If a crack occurs in the sealing member 20, the sealing performance of the sealing member 20 will decrease. At this time, in the fluid chamber 102 in a negative pressure state, the gas in the housing 101 will flow into the fluid chamber 102 through the crack, so The pressure (decompression degree) of the fluid chamber 102 rises rapidly. Therefore, as the wear state predicting means 2 in this embodiment, it is possible to predict the wear state of the sealing member 20 by detecting the pressure change of the fluid chamber 102 and using the detection result. The prediction of the wear state based on the prediction device 1A of this embodiment is preferably performed while the machine 100 is running. In addition, when the machine 100 is a dispersing device such as Jet Paster (registered trademark), which disperses based on the action of cavitation and shear force, by using the machine 100 to inject powder into the process of making the slurry, and Prediction is performed during the circulation of the slurry (during circulation operation), so that the wear state of the sealing member 20 can be predicted with good accuracy.

As an example of the wear state prediction means 2, for example, as shown in FIG. 1 , the following can be mentioned: a pressure gauge M1 is provided in the fluid chamber 102 to measure the pressure P1 in the fluid chamber 102, and the measured value is collected and analyzed. The change of pressure P1 can be detected directly by the information about the change over time. That is, as the wear state predicting means 2, the following can be mentioned: the measuring part 2a is equipped with the pressure gauge M1 of the pressure P1 of the measuring fluid chamber 102; Calculate the value obtained by M1). Also, as the measurement unit 2a and the calculation unit 2b, for example, those provided with a calculation device that executes programs necessary for data acquisition or data calculation (comparison calculation, etc.) using a processor such as a CPU can be mentioned. Here, the program for operating the measurement unit 2a and the calculation unit 2b corresponds to the prediction program in this embodiment.

In addition, the wear state predicting means 2 is not limited to the means of directly detecting the change of the pressure P1, and other means may be used to detect the pressure change in the fluid chamber. For example, when the pressure (decompression degree) in the fluid chamber 102 increases, the temperature and the flow rate of the fluid moving in the fluid chamber 102 also change. More specifically, for example, if a crack occurs in the sealing member 20, the sealing performance of the sealing member 20 will decrease, gas (air) will flow into the fluid chamber 102, and the temperature of the fluid will drop. Furthermore, since the gas (air) flows into the fluid chamber 102, a space is created in the slurry and pulsation occurs, so that the delivery of the fluid becomes unstable and the flow rate decreases. Therefore, as another example of the wear state predicting means 2, in addition to the means of directly detecting the change of the pressure P1, it is also possible to include: a fluid temperature measuring means for measuring the temperature of the fluid in the fluid chamber 102 or a means for measuring the temperature of the fluid in the fluid chamber 102; Fluid flow rate measuring means for the flow rate of the fluid in the chamber 102. Here, as the wear state predicting means 2, the following may be used: instead of the pressure gauge M1, a temperature measuring device (thermometer, temperature sensor, etc.) for measuring the temperature of the fluid is provided or the flow rate of the fluid is measured. The flow measurement device (flow meter, etc.) of the present invention indirectly detects the change of the pressure P1 by collecting and analyzing the information related to the change of the measured value over time. That is, as the wear state predicting means 2, the following ones can be enumerated: the measuring unit is equipped with a measuring device for measuring the temperature or flow rate of the fluid in the fluid chamber 102; get the value. In addition, the measurement unit and the calculation unit at this time may be executed by the prediction program in this embodiment. Thereby, fluid quality control can be performed together with the prediction of the wear state of a sealing member.

In the wear state predicting means 2, as an example related to the collection and analysis of information on the time-dependent change of the pressure P1, when the value of the pressure P1 obtained by the measuring unit exceeds a preset threshold value, An example in which the wear state of the sealing member 20 is predicted to be quite severe. Also, as another example, it can be mentioned that the value of the pressure P1 obtained by the measuring unit is compared with the value obtained by the previous measurement, and when the change exceeds a preset threshold value, it is predicted that the sealing member 20 is an example where the state of wear is quite serious. In addition, as long as the threshold value set here is at least the value related to the upper limit among the values related to the upper limit and the lower limit of the pressure P1, it is sufficient to set both.

In addition, a notification unit may be further provided in the wear state prediction means 2 to urge the operator to carry out maintenance work. The notification unit is to send the results of collection and analysis of information related to the change of pressure P1 over time, and the need for inspection. Notice or warning about maintenance related to replacement. Thereby, the timing of inspection and replacement of the sealing member 20 can be grasped appropriately and easily.

As described above, using the prediction device 1A of this embodiment and the prediction method and prediction program related to the prediction device 1A, by providing the wear state prediction means for the shaft seal device installed in the fluid chamber in which the fluid moves inside, it is possible to A wear state of the seal member is predicted from a change in pressure occurring inside the fluid chamber due to wear occurring in the seal member. This makes it possible to accurately predict the wear state of the seal member without disassembling the shaft seal device, and to appropriately grasp the replacement timing of the seal member. In addition, it is possible to reduce the operator's burden and cost related to the maintenance work of the shaft sealing device. Moreover, the predicting device 1A of this embodiment and the predicting method and predicting program related to the predicting device 1A are especially suitable for use in machines equipped with shaft sealing devices, that is, fluid chambers such as slurry pumps or dispersing devices. In the case of a machine that is in a negative pressure state and is used for stirring and mixing powder and liquid.

[Second Embodiment] Fig. 3 is a schematic explanatory diagram showing the configuration of a prediction device in a second embodiment of the present invention. 4 is a schematic explanatory diagram showing another aspect of the prediction device in the second embodiment of the present invention. As shown in FIGS. 3 and 4 , the prediction device 1B of the second embodiment is provided with a wear state display unit 4 for displaying the wear state of the sealing member 20 relative to the prediction device 1A of the first embodiment. In addition, description of the same configuration as that of the first embodiment will be omitted. In addition, FIG. 3 and FIG. 4 show a different configuration of the wear state display unit 4 .

The wear state display part 4 in this embodiment is used to display the wear state of the sealing member 20 . Here, "displaying the wear state of the sealing member 20" includes displaying that the sealing member 20 is in a normal state (unworn state) in addition to displaying that the sealing member 20 is worn to the extent that it needs to be replaced immediately, or that although it is not necessary Replacement, but the seal member 20 has started to wear.

As an example of the wear state display unit 4, as shown in FIG. 3 , the following can be mentioned: a display 40 is connected to the wear state predicting means 2, and displays the wear of the sealing member 20 obtained by the wear state predicting means 2. State-related data (prediction results); and the control unit 41 controls the content and display mode displayed by the display 40 .

Here, as the content displayed by the display 40 and the control part 41, the value of the pressure P1 in the fluid chamber 102 measured by the pressure gauge M1 in the measuring part 2a is mentioned, for example. Also, at this time, it is preferable to change the display mode according to the value of the pressure P1 so that the operator can easily grasp the prediction result related to the wear state of the sealing member 20 . In addition to gradually changing the color in the frame 42 (for example, when the value of the pressure P1 is displayed in the frame 42 on the display 40 and the pressure P1 is within the critical value, that is, when the sealing member 20 is in a normal state (not yet worn out) ), the frame 42 is displayed in blue (or green), when the pressure P1 tends to drop, the frame 42 is displayed in yellow, when the pressure P1 exceeds the critical value, that is, when it is judged that the sealing member 20 has In addition to displaying the inside of the frame 42 in red at the time of abrasion), fonts or sizes of displayed numerical values are gradually changed according to the value of the pressure P1. In addition, it is preferable that the wear state display unit 4 also has the function related to the above-mentioned notification unit. That is, it can be mentioned that when the pressure P1 exceeds the critical value, the wear state of the sealing member 20 is quite serious, and when the sealing member 20 needs to be replaced, in addition to displaying the inside of the frame 42 in red, maintenance such as replacement will also be required. Notifications or warnings are displayed on the message column 43 on the display 40 to urge the operator to perform maintenance work and the like.

In addition, as the content displayed via the display 40 and the control unit 41, in addition to the pressure P1, the temperature of the fluid obtained by the fluid temperature measuring means or the flow rate of the fluid obtained by the fluid flow measuring means can be cited as examples. The display of these numerical values is preferably displayed in a display mode corresponding to the prediction of the wear state of the sealing member 20 similarly to the display of the value of the pressure P1. In addition, information related to the overall operation control of the machine 100 may also be displayed on the display 40 . For example, various numerical values (pressure, temperature, rotation speed, flow rate, etc.) measured for each component (decompression pump, supply/discharge piping, etc.) related to the device 100 other than the fluid chamber 102 may be displayed together. At this time, various numerical values may be displayed together with a schematic diagram showing each configuration of the device 100 . Thereby, the operator can easily grasp the operation state of the machine 100 as a whole together with the prediction result regarding the wear state of the sealing member 20 .

As still another example of the wear state display unit 4 , as shown in FIG. 4 , an example in which an analog pressure gauge 44 is provided for the pressure gauge M1 as the wear state predicting means 2 can be given. Also, at this time, the scale part 44a of the pressure gauge 44 is used as a display mode corresponding to the prediction result related to the wear state of the sealing member 20, so that the operator can quickly and easily grasp the relationship with the wear state of the seal member 20. The predicted results are good. For example, as shown in FIG. 4 , it can be mentioned that the scale portion 44a pointed to by the pointer 44b of the pressure gauge 44 is divided into three areas, and the sealing member 20 is in a normal state (not yet worn out) in blue (or green). ), the area of the range of pressure values when the pressure P1 tends to drop is displayed in yellow, and the area of the range of pressure values when it is judged that the sealing member 20 is worn out is displayed in red to display.

As described above, with the prediction device 1B of the present embodiment, by providing the wear state display unit for displaying the prediction result related to the wear state of the seal member, the operator can accurately grasp the state of the seal member in the shaft seal device. The state and wear tendency can also be easily and appropriately judged for subsequent correspondence. In addition, it is possible to reduce the operator's burden and cost related to the maintenance work of the shaft sealing device.

[The third embodiment] Fig. 5 is a schematic explanatory diagram showing the configuration of a prediction device in a third embodiment of the present invention. 6 is a schematic explanatory diagram showing another aspect of the shaft sealing device and the predicting device in the third embodiment of the present invention. The predicting device 1C of the third embodiment is, as shown in FIGS. 5 and 6 , provided with a pressing degree detecting means 3 in addition to the wear state predicting means 2 in the predicting device 1A of the first embodiment. In addition, description of the same configuration as that of the first embodiment will be omitted. In addition, in FIG. 5 and FIG. 6, as the shaft sealing device 10, the structure of the pressing part 30 is different, and various aspects of the corresponding prediction device 1C are shown.

The predicting device 1C of the present embodiment is provided with the wear state predicting means 2 for detecting the pressure change of the fluid chamber 102 and predicting the wear state of the sealing member 20, and is further provided with the pressure detection pressing part 30. The pressure detection method of the step of degree. The pressing degree detection means 3 is used to detect the degree to which the pressing part 30 presses the fixed side member 21 or the rotating side member 22 . Here, the “degree of pressing” refers to the magnitude of the force P applied by the pressing portion 30 to bring the fixed-side member 21 and the rotating-side member 22 into close contact. In addition, the "detection of the pressing degree" includes not only directly measuring the magnitude of the force P, but also measuring parameters that affect the magnitude of the force P.

When the sealing member 20 is worn, the close contact state between the sliding surface 21a of the fixed side member 21 and the sliding surface 22a of the rotating side member 22 changes, so the pressing degree (magnitude of force P) of the pressing part 30 also changes. will change. Therefore, the wear state of the sealing member 20 can be predicted by detecting the pressing degree of the pressing portion 30 using the pressing degree detection means 3 in this embodiment.

The configuration of the pressing unit 30 that detects the degree of pressing using the prediction device 1C of this embodiment is not particularly limited. For example, in addition to the spring mechanism 31 using a coil spring or the like as shown in FIG. 5 , an example using a pressurizing mechanism 32 using high-pressure gas as shown in FIG. 6 can also be given. When high-pressure gas is used in the pressurizing mechanism 32 , when an abnormality such as a crack occurs in the sealing member 20 , the gas flows from the case 101 side to the fluid chamber 102 side, so that pressure rise can be easily detected. In addition, the structure of the pressing part 30 shown in FIG. 5 is the same example as the structure of the pressing part 30 shown in FIG. 1 in 1st Embodiment.

The pressing portion 30 shown in FIG. 5 is constituted by a spring mechanism 31 arranged in the casing 23 . The pressing part 30 in FIG. 5 uses the elastic force of the spring mechanism 31 to press the fixed-side member 21 toward the rotating-side member 22 . In addition, regarding what uses the spring mechanism 31 as the pressing part 30, you may use the structure etc. which are shown in FIG. 2 in 1st Embodiment. On the other hand, the pressing unit 30 shown in FIG. 6 is provided with a pressurizing mechanism 32 utilizing the pressure of high-pressure gas. The specific structure of the pressurizing mechanism 32 is not particularly limited as long as it can press the sealing member 20 (the fixed-side member 21 or the rotating-side member 22 ) with high-pressure gas. As an example of the pressurizing mechanism 32, for example, it can be mentioned that the high-pressure gas is supplied into the casing 101 of the airtight structure through the line L1, and the high-pressure gas is fixed to the casing 23 via the communication part 23a provided in the casing 101 to communicate with the casing 101. An example of pressing the side member 21 toward the rotation side member 22 .

For example, as shown in FIGS. 5 and 6 , when the pressing portion 30 applies a force P (pressure P2) from the side of the fixed side member 21 toward the side of the rotating side member 22, as the pressing degree detection means 3, the following can be mentioned: Let it be an example of the means for detecting the change of the pressure P2 at this time.

As an example of means for detecting changes in the pressure P2, for example, as shown in FIG. The part where the pressure P2 is applied by the spring mechanism 31 is provided with a pressure sensor S1 such as a piezoelectric pressure sensor to measure the pressure P2, and the pressure is directly detected by collecting and analyzing information related to changes in the measured value over time Examples of changes in P2. That is, as the pressing degree detection means 3, can enumerate: possess measuring part 3a, it is equipped with the pressure sensor S1 that measures the pressure P2 that produces by spring mechanism 31; An example of the value obtained by section 3a (pressure sensor S1). And, as another example of the means for detecting the change of pressure P2, for example, as shown in FIG. An example of measuring the pressure P3 of the high-pressure gas supplied to the pressing part 30 and indirectly detecting the change of the pressure P2 by collecting and analyzing information on the temporal change of the measured value. That is, as the pressing degree detecting means 3, it is possible to mention: a measuring part 3c, which is equipped with a pressure gauge M2 for measuring the pressure P3 of the high-pressure gas supplied to the casing 101 through the pipeline L1; and a computing part 3d, which collects An example of analyzing the value obtained by the measuring part 3c (manometer M2). In addition, in the same manner as the measurement unit 2a and the calculation unit 2b in the above-mentioned wear state predicting means 2, the data acquisition or data calculation (comparison calculation, etc.) in the measurement units 3a, 3c and calculation units 3b, 3d The program is created as a forecast program in the cost implementation mode, and the measurement units 3a, 3c and the calculation units 3b, 3d are operated by executing the forecast program.

In the pressing degree detection means 3, as an example related to the collection and analysis of information related to the time-dependent change of the pressure P2 (or pressure P3), it can be mentioned that when the pressure P2 (or pressure P3) obtained by the measuring part When the value of exceeds the preset critical value, it is predicted that the wear state of the sealing member 20 is quite serious. Also, as another example, it can be mentioned that the value of the pressure P2 (or pressure P3) obtained by the measuring unit is compared with the value obtained by the previous measurement, and when the amount of change exceeds a preset threshold value, the It is predicted that the wear state of the sealing member 20 is quite severe. In addition, as long as the critical value set here is within the value related to the upper limit and lower limit of the pressure P2 (or pressure P3) according to the change tendency of the pressure P2 fluctuating due to the wear state of the sealing member 20, at least It is enough to set one of them, or both can be set. For example, it can be mentioned that when the pressing part 30 uses the pressurizing mechanism 32 based on high-pressure gas, the pressure P3 of the high-pressure gas supplied to the pressing part 30 will tend to increase due to the wear of the sealing member 20. The threshold value related to P3 is an example of setting the value related to the upper limit.

In addition, a notification unit may be further provided in the pressing degree detection means 3 to urge the operator to carry out maintenance work. The notification unit sends the results of collection and analysis of information related to changes in pressure P2 (or pressure P3) over time. . Notice or warning that maintenance related to inspection and replacement is required. In addition, the above-mentioned wear state display unit 4 may be provided to display the wear state of the sealing member 20 based on the information obtained from the pressing degree detection means 3 . Thereby, the inspection and replacement timing of the sealing member 20 can be grasped suitably and easily.

As described above, the predicting device 1C according to the present embodiment and the predicting method and predicting program related to the predicting device 1C are further provided with a wear state predicting means in addition to predicting the wear state of the sealing member in the shaft seal device. There is a pressing degree detection means, whereby the pressing degree of the pressing portion on the fixed side member and the rotating side member can be grasped, and the wear state of the sealing member can also be predicted from the change of the pressing degree. Thereby, the wear state of the seal member can be predicted more accurately without disassembling the shaft seal device, and the replacement timing of the seal member can be grasped more appropriately. In addition, it is possible to further reduce the operator's burden and reduce the cost related to the maintenance work of the shaft sealing device.

In addition, the above-mentioned embodiment is an example of a prediction device, a prediction method, and a prediction program. The forecasting device, forecasting method, and forecasting program of the present invention are not limited to the above-mentioned embodiments, and the forecasting device, forecasting method, and forecasting program of the above-mentioned embodiments can be modified within the scope of not changing the gist described in the claims.

For example, in addition to the wear state prediction means and the pressing degree detection means related to the prediction devices 1A to 1C of this embodiment, it may be further combined with a means for grasping the wear state of the sealing member. As such a means, for example, an example in which a temperature change detection means for detecting a temperature change of the pressing part or the periphery of the pressing part is further provided can be mentioned. If the wear of the sealing member is severe, not only the sealing member but also the pressing portion and the periphery of the pressing portion will undergo temperature changes due to the friction of the sliding surface. In particular, when the materials of the sealing members (fixed side member and rotating side member) are laminated with a soft material such as carbon and a hard material such as SiC or ceramics, and the soft material is used on the sliding surface side, the Hard material is exposed on the sliding surface side due to abrasion. At this time, since the hard materials slide against each other, frictional heat is more likely to be generated, and a phenomenon in which the temperature rise of the pressing part and the surrounding area of the pressing part becomes larger. Therefore, by detecting the temperature change of the pressing portion or the periphery of the pressing portion by the temperature change detecting means, it is possible to grasp the wear state of the sealing member. Here, in addition to directly measuring the temperature of the pressing part or measuring the temperature of the space around the pressing part, as the position where the temperature is measured by the temperature change detection means, especially when the slurry flows around the pressing part, it is also possible to include: An example of temperature. In addition, when measuring the temperature of the slurry, in addition to measuring the temperature of the slurry near the pressing portion, an example of measuring the temperature of the slurry on the circulation path of the slurry can be given. As described above, in addition to the wear state predicting means and the pressing degree detecting means, the detection temperature change detection means for detecting the temperature change of the pressing part or the periphery of the pressing part is further provided, whereby the sealing can be grasped with higher accuracy. The wear state of the component. [Industrial availability]

The prediction device, prediction method, and prediction program of the present invention can be suitably used in various shaft sealing devices and various machines equipped with various shaft sealing devices. In addition, the predicting device, predicting method, and predicting program of the present invention can be suitably used especially in mechanical seals and machines equipped with mechanical seals.

1A, 1B, 1C: Prediction device 2: Wear state prediction means 2a: Measurement Department 2b: Computing department 3: Press degree detection means 3a, 3c: measurement part 3b, 3d: computing department 10: Shaft seal device 20: sealing member 21: Fixed side member 21a: sliding surface 22: Rotating side members 22a: sliding surface 23: shell 23a: Connecting part 24,25: Support member 30: Pressing part 31: spring mechanism 32: Pressurization mechanism 4: Wear status display part 40: display 41: Control Department 42: frame 43: message column 44: Pressure gauge 44a: Scale part 44b: Pointer 100: machine 101: Shell 102: Fluid chamber L1: pipeline M1, M2: pressure gauge P: Force exerted by the pressing part P1~P3: pressure R: axis of rotation S1: pressure sensor W: wall

[ Fig. 1 ] is a schematic explanatory diagram showing the configuration of a shaft seal device and a prediction device in a first embodiment of the present invention. [ Fig. 2 ] is a schematic explanatory diagram showing another aspect of the shaft seal device in the first embodiment of the present invention. [FIG. 3] It is a schematic explanatory drawing which shows the structure of the prediction apparatus in the 2nd Embodiment of this invention. [ Fig. 4 ] is a schematic explanatory diagram showing another aspect of the prediction device in the second embodiment of the present invention. [ Fig. 5 ] is a schematic explanatory diagram showing the structure of a prediction device in a third embodiment of the present invention. [ Fig. 6 ] is a schematic explanatory diagram showing another aspect of the shaft sealing device and the predicting device in the third embodiment of the present invention.

Claims (7)

A predicting device is a device for predicting the wear state of a sealing member in a shaft sealing device, characterized in that, The aforementioned shaft sealing device includes: a sealing member having a fixed-side member having a sliding surface and a rotating-side member having a sliding surface; and a pressing portion that presses so that the sliding surface of the fixed-side member and the sliding surface of the rotating-side member are in close contact, The predicting device is provided with wear state predicting means, and the wear state predicting means predicts the wear state of the sealing member according to the pressure change inside the fluid chamber in which the shaft sealing device is installed and the fluid moves inside. The prediction device as described in claim 1, wherein The prediction device further includes a wear state display unit that displays a wear state of the sealing member. The prediction device as described in claim 1 or claim 2, wherein The wear state predicting means includes fluid temperature measuring means for measuring the temperature of the fluid. The prediction device as described in claim 1 or claim 2, wherein The wear state predicting means includes fluid flow measuring means for measuring the flow of the fluid. The prediction device according to any one of claim 1 to claim 4, wherein The predicting device is further provided with a degree of pressing detection means for detecting the degree of pressing of the pressing part. A prediction method is a method for predicting the wear state of a sealing member in a shaft sealing device, which is characterized in that, The aforementioned shaft sealing device includes: a sealing member having a fixed-side member having a sliding surface and a rotating-side member having a sliding surface; and a pressing portion that presses so that the sliding surface of the fixed-side member and the sliding surface of the rotating-side member are in close contact, The aforementioned predicting method is provided with a wear state predicting step. In the wear state predicting step, the wear state of the sealing member is predicted based on the pressure change inside the fluid chamber in which the shaft sealing device is installed and the fluid moves inside. A prediction program is a program used to predict the wear state of the sealing member in the shaft sealing device, which is characterized by, The aforementioned shaft seal device has: A sealing member comprising a fixed-side member having a sliding surface and a rotating-side member having a sliding surface; and a pressing portion that presses so that the sliding surface of the fixed-side member and the sliding surface of the rotating-side member are in close contact, The prediction program executes a wear state prediction process. In the wear state prediction process, the wear state of the sealing member is predicted based on the pressure change inside the fluid chamber in which the shaft seal device is installed and the fluid moves inside.

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