JP7339074B2 - Condition monitoring device for pump and pump provided with same - Google Patents

Description

The present invention relates to a technique for monitoring pump status.

For example, slurry pumps for pumping high-concentration or corrosive slurries may suffer from premature wear of wetted parts, entrapment or clogging of foreign matter, and significant performance degradation. Therefore, it is necessary to prepare for sudden maintenance on a daily basis.
On the other hand, when parts are replaced early because they dislike sudden responses, they often miss the optimum maintenance cycle. For this reason, both users and manufacturers must always have a large inventory of parts and maintenance support personnel, and the current situation is that maintenance costs and running costs are increasing.

JP-A-2008-261668 (paragraphs 0011 and 0016)

On the other hand, in order to monitor the state of the pump, it has been common for a long time to attach a pressure gauge to the suction pipe and the discharge pipe connected to the pump (see, for example, Patent Document 1). In order to obtain the information, it is necessary to attach the pressure sensor to the wetted part of the pump or a place as close as possible to the wetted part.
However, in the high-concentration/corrosive slurry pump, there is a problem that wear advances from the mounting hole of the pressure sensor. Therefore, it is practically difficult to attach a pressure sensor to the wetted portion of the slurry pump itself.
Therefore, the present invention has been made by paying attention to such problems, and provides a slurry pump that can monitor the state of the pump itself even if it is a slurry pump that pumps high-concentration slurry or corrosive slurry. An object of the present invention is to provide a condition monitoring device and a pump equipped with the same.

In order to solve the above-described problems, a pump condition monitoring device according to one aspect of the present invention has a casing in which the inner surface of the wetted portion of the casing is lined with a soft rubber, or a soft rubber liner is included inside the casing. A condition monitoring device for use in a pump that monitors the state of the pump, comprising pressure sensors embedded in the soft rubber at a plurality of locations away from the inner surface of the wetted portion of the soft rubber, and the plurality of locations. and a state information detection unit that detects information related to the state of the pump based on the pressure information acquired by the pressure sensor.

According to the pump condition monitoring device according to one aspect of the present invention, the pressure sensors embedded in the soft rubber separated from the liquid contact surface of the soft rubber lining or liner are arranged at a plurality of locations on the inner surface of the liquid contact portion. The state information detection unit can detect information regarding the state of the pump based on the pressure information acquired by the pressure sensors at the plurality of locations.
Therefore, even in a slurry pump for pumping high-concentration slurry or corrosive slurry, the inner surface of the wetted part of the casing is lined with soft rubber or the inner surface of the casing contains a liner made of soft rubber. By using the pump condition monitoring device according to one aspect of the present invention, it is possible to monitor the condition of the pump itself, such as abnormal internal pressure of the pump, degradation of pump performance, and wear.

Further, in order to solve the above problems, a pump according to one aspect of the present invention is a pump in which the inner surface of the wetted portion of the casing is lined with soft rubber, or a liner made of soft rubber is included inside the casing. and is equipped with a pump condition monitoring device according to an aspect of the present invention.
According to the pump according to one aspect of the present invention, since the pump state monitoring device according to one aspect of the present invention is installed, the state of the pump itself can be monitored.

As mentioned above, the present invention allows the status of the pump itself to be monitored.

1 is a schematic longitudinal sectional view illustrating an embodiment of a pump provided with a pump condition monitoring device according to one aspect of the present invention; FIG. FIG. 2 is a schematic diagram of a pressure sensor used in the pump condition monitoring device of FIG. 1, where (a) is a front view thereof and (b) is a ZZ sectional view of (a).

An embodiment of the present invention will be described below with appropriate reference to the drawings. The example of this embodiment is an example in which a pump condition monitoring device according to an embodiment of the present invention is installed in a centrifugal pump used as a high-concentration/corrosive slurry pump.
Note that the drawings are schematic. Therefore, it should be noted that the relationship, ratio, etc. between the thickness and the planar dimensions are different from the actual ones, and the drawings include portions where the relationship and ratio of the dimensions are different from each other.
Further, the embodiments shown below are examples of devices and methods for embodying the technical idea of the present invention. etc. are not specified in the following embodiments.

As shown in FIG. 1, this centrifugal pump 1 has a casing 5 provided in front of a frame (not shown). The frame is provided with a bearing portion that rotatably supports the drive shaft 4 via bearings that are spaced apart in the longitudinal direction.
A semi-open impeller 2 housed inside a casing 5 is fixed to the tip of the drive shaft 4 . The impeller 2 has a substantially disk-shaped base portion 2b, and a plurality of blades 2c projecting axially forward are formed integrally with the base portion 2b.

The casing 5 includes a rear body portion 5b and a front suction portion 5a. The suction portion 5a and the main body portion 5b are fixed to each other by bolts and nuts (not shown), and an accommodation space for the impeller 2 is defined therein.
A discharge port 5t is formed in the upper portion of the body portion 5b of the casing 5, and a discharge pipe 8 is connected to the discharge port 5t. A front cover 6 is attached to the front of the suction portion 5a of the casing 5. The front cover 6 is formed with a suction port 6n projecting forward along the axial direction. 7 is connected.

A liner 3 is mounted inside the casing 5 to cover the entire inner surface of the wetted portion. Instead of the liner 3, the inner surface of the liquid-contacting portion of the casing 5 may be lined with a soft rubber. In other words, the present invention can be applied to pumps in which the inner surface of the liquid-contacting portion of the casing is lined with soft rubber, or a liner made of soft rubber is included inside the casing.

Here, the soft rubber constituting the lining or liner is made of natural rubber or various synthetic rubbers (for example, acrylonitrile-butadiene rubber (NBR), butyl rubber (isobutylene-isoprene rubber (IIR)), etc.). It is appropriately selected depending on the properties (for example, the corrosiveness of the slurry, etc.).
As for the hardness of the soft rubber that constitutes the lining or liner, a type A durometer hardness of 70° or less (JIS K6253), as measured by a durometer hardness tester, is preferable. A rubber having a small compression set is suitable, and a rubber containing air bubbles, such as a sponge-like rubber, is not suitable.

In the present embodiment, the soft rubber forming the liner 3 has wear resistance superior to that of a metal material against fine particle slurry having an average particle size of about 1 mm or less. In addition, the soft rubber forming the liner 3 can cope with high-concentration, corrosive slurry by selecting an appropriate soft rubber material for corrosion resistance and chemical resistance. For this reason, a slurry pump having a rubber lining on the inner surface of the wetted part or a liner made of soft rubber inside the casing is suitable for highly concentrated and corrosive slurry.

Here, the state monitoring device 10 of the present embodiment includes pressure sensors 9A and 9B for pipe sections, a plurality of thin pressure sensors 20A, 20B, 20C, and 20D, and a controller 30 that constitutes an operating state information detection section. , has The controller 30 is an information processing device including a computer, and executes predetermined pump operating state information detection processing to detect abnormalities in the internal pressure of the pump, deterioration in performance of the pump, wear of the pump, and the like. It is configured so that the status can be monitored.
Specifically, in this embodiment, the suction pipe 7 is attached with a pressure sensor 9A for the pipe portion, and the discharge pipe 8 is attached with a pressure sensor 9B for the pipe portion. Furthermore, on the inner surface of the liquid-contacting portion of the casing 5, a plurality of thin pressure sensors 20A, 20B, 20C, and 20D are provided at an arbitrary distance from the liquid-contacting surface of the soft rubber liner 3 (four or four in this example). place).

In this embodiment, the pressure sensors 20A, 20B, 20C, and 20D are arranged at a plurality of arbitrary positions on the inner surface of the wetted part, so that the pressure information acquired by the pressure sensors 20A, 20B, 20C, and 20D at the plurality of positions is Based on this, it is configured to be able to detect in detail information related to the operating state of the centrifugal pump 1 .
As a result, the controller 30 executes the pump operating state information detection process to detect an abnormality in the internal pressure of the pump, deterioration in performance of the pump, wear of the pump, etc., and outputs the detected information to a display device such as a monitor. It is possible.

Here, in monitoring and diagnosing the pump operating state in the pump operating state information detection processing executed by the controller 30, it is not always necessary to evaluate the pump using absolute values such as pressure values. , monitoring and diagnosis are possible by evaluating relative to the initial value of the pressure when new.
Although the pressure sensors 20A, 20B, 20C, and 20D are not particularly limited, it is preferable to use a film-like thin film pressure sensor (for example, manufactured by Interlink Electronics Co., Ltd.) having a thickness of about 0.2 mm.

This type of pressure sensor includes, for example, a two-wire type pressure sensing portion 20a having a diameter of about φ5 mm and no movable portion, and a gusset portion 20f, like the pressure sensor 20 shown in FIG. As shown in FIG. 4B, the pressure sensing portion 20a has a structure in which an upper adhesive portion 20b, an upper substrate 20c, an internal adhesive portion 20d, and a lower substrate 20e are laminated in this order from the upper surface side. A portion constituted by the internal bonding portion 20d and the lower substrate 20e serves as a gusset portion 20f including wiring led out from the pressure sensing portion 20a.
The pressure-sensitive sensor 20 shown in FIG. 2 has a characteristic that the electrical resistance decreases linearly as the pressure applied to the pressure-sensitive portion 20a increases. Therefore, it can be used as a pressure sensor that has a low operating pressure, a wide sensitivity range, is thin, and is resistant to moisture, dirt, etc., and has durability.

In this embodiment, pressure sensors 20 shown in FIG. embedded pressure sensors 20A, 20B, 20C, 20D having a configuration. That is, the first pressure sensor 20A is embedded in the impeller 2 at a position facing the front ends of the blades 2c. Thereby, the fluctuation state of the clearance can be detected.

The second pressure sensor 20B is embedded in the suction port 6n of the front cover 6 or in the vicinity thereof (in the example of the present embodiment, the corner portion of the suction port 6n). Further, the third pressure sensor 20C is embedded in the casing 5 at or near the lowest position (the lowest position in the example of this embodiment). The fourth pressure sensor 20D is embedded in the casing 5 at or near the discharge port 5t (in the example of the present embodiment, at a position near the discharge port 5t).

When the impeller 2 wears and the pump performance of the centrifugal pump 1 deteriorates, the pressure largely decreases mainly at the pressure sensor 20D near the discharge port 5t. Further, when the wear of the liner 3 progresses, the pressure sensors 20A, 20B, 20C, and 20D at which the wear has progressed are exposed, causing an electrical failure. It can be detected that it has reached the embedding position.

Furthermore, the remaining time until the hole finally penetrates the liner 3 can be predicted from the positions where the pressure sensors 20A, 20B, 20C, and 20D are embedded and the elapsed time until the conduction failure occurs. Therefore, according to the condition monitoring device 10 of the present embodiment, the parts replacement cycle of the centrifugal pump 1 can be optimized.
In addition to the pressure information acquired from these pressure sensors 20A, 20B, 20C, and 20D, the pressure information acquired from the pressure sensors 9A and 9B for the piping section, and the pressure information acquired from other sensors such as temperature sensors. By adding data, a more detailed operating condition of the centrifugal pump 1 can be obtained.

As described above, the pump condition monitoring device 10 of the present embodiment is a technique that can be applied to general condition monitoring of pumps. In the pump 1, it is suitable for monitoring the operating state of the pump, such as abnormal internal pressure of the pump, deterioration of pump performance, and wear. It is especially effective for maintenance of slurry pumps exposed to severe liquid quality.

Furthermore, by using the pump condition monitoring device 10 of the present embodiment, the centrifugal pump 1 can be remotely monitored, and in cooperation with other equipment, it can be used as an information transmitting device such as maintenance information of the centrifugal pump 1 such as a slurry pump. Applicable. It should be noted that the pump condition monitoring device and the pump equipped with the same according to the present invention are not limited to the above-described embodiments, and various modifications are possible without departing from the gist of the present invention. .

Reference Signs List 1 centrifugal pump 2 impeller 3 liner 4 drive shaft 5 casing 6 front cover 7 suction pipe 8 discharge pipe 9A, 9B pressure sensor (for pipe part) 10 condition monitoring device 20, 20A, 20B, 20C, 20D pressure sensor 30 controller ( state information detector)

Claims (3)

A slurry pump in which an impeller having a plurality of blades is housed inside a casing, and the inner surface of the liquid-contacting portion of the casing is lined with soft rubber or a liner made of soft rubber is enclosed inside the casing to pump out slurry. A state monitoring device used for monitoring the state of the slurry pump,
a plurality of pressure sensors embedded in different locations in the soft rubber constituting the lining or the lining or the liner, separated from the inner surface of the liquid-contacting portion of the lining or the liner ;
a state information detection unit that monitors the operating status of the slurry pump based on the pressure information acquired by the plurality of pressure sensors;
has
Among the plurality of pressure sensors embedded in the lining or liner,
The first pressure sensor is embedded at a position facing the blade front end of the impeller,
The second pressure sensor is embedded at or near the suction port of the casing,
a third pressure sensor embedded at or near the lowest position of the casing;
A fourth pressure sensor is embedded at or near the outlet of the casing,
The state information detection unit is
detecting progress of wear of the lining or the liner based on the pressure information acquired by the first to fourth pressure sensors;
When the information regarding the energization failure is obtained from any one of the first to fourth pressure sensors, based on the position where the pressure sensor is embedded and the elapsed time until the energization failure occurs, predicting the remaining time until the lining or the liner penetrates;
A state monitoring device for a pump characterized by: Further comprising a pressure sensor for a pipe portion provided in a pipe connected to the suction port and the discharge port of the slurry pump,
The state information detection unit operates the slurry pump based on pressure information obtained from the plurality of pressure sensors embedded in the lining or liner and pressure information obtained from the pressure sensor for the piping section. 2. The pump condition monitoring device according to claim 1 , which monitors the condition . A slurry pump in which an impeller having a plurality of blades is housed inside a casing, and the inner surface of the liquid-contacting portion of the casing is lined with soft rubber or a liner made of soft rubber is enclosed inside the casing to pump out slurry. and
A slurry pump equipped with the pump condition monitoring device according to claim 1 or 2 .

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