JP2015183570A - Air blowing system with fretting preventing function - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent fretting of an air blower in stopping.SOLUTION: An air blowing system includes a plurality of air blowers F1 and F2, a plurality of first ducts 10 respectively connected to the air flowers F1 and F2, a second duct 11 with which the first ducts 10 are merged and extended toward an air blowing target A, and a bypass system X for sending a part of wind from the air blower in driving to the air blower in stopping when driving of one of the air blowers F1 and F2 is stopped.

Description

  The present invention is a blower system including a plurality of blowers, a plurality of first ducts connected to each of the plurality of blowers, and a second duct obtained by merging the plurality of first ducts. The present invention relates to a blower system with a function to prevent fretting.

  Conventionally, provided with a plurality of blowers, a plurality of first ducts connected to each of the plurality of blowers, and a second duct obtained by joining the plurality of first ducts, the first duct, There is known a blower system that sends air to a blow target via two ducts and cools the blow target.

  Hereinafter, a power plant equipped with this type of blower system will be described as an example. As shown in FIG. 3, the power plant includes a boiler A installed on a foundation B and a blower system for cooling the boiler A. The symbol V in the figure is a burner.

  As shown in FIG. 4, the blower system includes a plurality of first ducts 10 and 10 connected to each of the fans F1 and F2 and a second duct 11 in which the plurality of first ducts 10 and 10 are merged. . 3 and 4, for convenience, two blowers F1 and F2 are illustrated.

  Each blower F1, F2 has a blade W. The plurality of fans F1 and F2 include those that are driven in a normal state and those that are stopped. Further, the blower F2 that is stopped in the normal state is driven during maintenance instead of the blower F1 that is driven in the normal state.

  The first duct 10 has a pressure regulating valve 100 on the exhaust side of the fans F1 and F2. A check valve 101 is provided on the outlet side of the pressure regulating valve 100. The check valve 101 controls the flow direction in which the wind from the fans F1 and F2 can be sent.

  The second duct 11 joins the wind of the first duct 10 and sends it to the boiler A.

  Of the plurality of fans F, at least one fan F1 is driven in a normal state, and the remaining fans F2 are stopped. On the other hand, at the time of maintenance, the blower F1 that has been driven is stopped, and at least one of the blower F2 to be stopped is driven.

Utility Model Registration No. 2564731

  By the way, the vibration of the blower F1 being driven is transmitted to the blower F2 being stopped via the blower system 1 and the foundation B of the blowers F1 and F2. For this reason, the shaft of the blower F1 that is stopped and the bearing are concentrated and contacted at the same position, and the shaft is damaged by this contact and separation (so-called fretting occurs).

  Then, an object of this invention is to provide the ventilation system with a fretting prevention function which can prevent the fretting of the air blower in the stop in view of the said problem.

  A blower system with a fretting prevention function according to the present invention is a second duct in which a plurality of blowers, a plurality of first ducts connected to each of the blowers, and a plurality of first ducts are joined, A second duct extending toward the fan, and a bypass system that sends a part of the wind from the driving fan to the stopping fan when driving of at least one of the plurality of fans is stopped Prepare.

  According to such a configuration, when the drive of at least one of the plurality of fans is stopped by the bypass system, a part of the air sent from the drive side is sent to the stop side. Due to a part of the air sent from the drive side, the stopped air blower rotates at a slow speed. Thereby, the local contact / separation of the axis | shaft of the air blower which is stopped by the vibration of the air blower being driven is prevented, and fretting can be prevented.

  In this case, the bypass system includes a first bypass duct connecting at least one first duct and at least one other first duct or a fan connected to the other first duct, and at least the first duct. A second bypass duct connecting any one of the other first ducts and at least one of the first ducts or a fan connected to the at least one of the first ducts; Correspondingly, it is preferable to include switching means for switching the air flow path in the bypass system to one of the first bypass duct and the second bypass duct.

  According to such a configuration, the first bypass duct connects at least one of the first ducts to at least one of the other first ducts or the blower connected to the other first duct. The second bypass duct connects the at least one other first duct to at least one first duct or the blower connected to the at least one first duct. And by the switching means, the ventilation path in the bypass system is switched to either the first bypass duct or the second bypass duct in correspondence with the driven blower.

  Further, the first bypass duct is connected to the casing of any one of the blowers so as to be blown to a position where the blades of the blower are rotated toward the rotation direction of blowing toward the first duct, and the second bypass duct It is preferable that the duct is connected to the casing of any one other blower so that air can be blown to a position where the blades of the blower are rotated toward the rotation direction of blowing air toward the first duct.

  According to such a configuration, the first bypass duct is connected to the casing of any one of the blowers so that the fan can be blown to a position where the blades of the blower are rotated toward the rotation direction of blowing toward the first duct. Drive because the second bypass duct is connected to the casing of any one other blower so that air can be blown to a position where the blades of the blower are rotated toward the rotation direction for blowing air toward the first duct. A part of the air sent from the blower in the middle causes the blades of the blower that is stopped to rotate in the forward direction (the same direction as during driving), the suction side of the blower that is stopped becomes negative pressure, and the exhaust side Become positive pressure. That is, the direction of the wind from the stopped blower becomes the same as the direction of the wind from the driven blower to the blow target. Thereby, it can prevent that the wind which flows toward the 2nd duct from the 1st duct connected to the air blower currently driven | sucking is suck | inhaled by the 1st duct connected to the air blower currently stopped. Thereby, required ventilation can be performed with respect to the second duct.

  As described above, according to the present invention, fretting of a stopped blower can be prevented.

FIG. 1 is a schematic configuration diagram showing a blower system with a fretting prevention function according to an embodiment of the present invention. FIG. 2: is a schematic block diagram which shows the modification of the ventilation system with a fretting prevention function of the air blower based on the embodiment. FIG. 3 is a schematic configuration diagram showing the arrangement relationship between a plurality of blowers and blow targets. FIG. 4 is a schematic configuration diagram showing a blower system for a conventional blow target.

  A blower system with a fretting prevention function according to an embodiment of the present invention will be described with reference to FIG. In FIG. 1, the same reference numerals as those in FIG. 4 denote the same or corresponding parts, and description of these parts is omitted, and different points will be described. In this embodiment, the power plant shown in FIG. 3 will be described as an example. In FIG. 1, two fans are illustrated for convenience.

  The blower system 1 with a fretting prevention function according to the present embodiment, as shown in FIG. 1, blows out from the drive side when driving of at least one of the plurality of blowers F1, F2 is stopped. Is provided with a bypass system X for sending a part of the system to the stop side.

  The bypass system X includes a first bypass duct 1 that connects one first duct 10 and the other first duct 10, and a second bypass duct that connects the other first duct 10 and the first duct 10. 2 is provided. Moreover, the 1st bypass duct 1 and the 2nd bypass duct 2 share a part, and become an H-type path | route. Specifically, each of the first bypass duct 1 and the second bypass duct 2 has a crank shape.

  The first bypass duct 1 has one first duct 10 between the outlet port of one pressure regulating valve 100 and the inlet port of one check valve 101, the exhaust side of the other blower F2, and the other pressure. The other duct 10 between the inlet port of the regulating valve 100 is connected.

  The first bypass duct 1 is connected to the first pressure regulating valve 1 a connected to one first duct 10, and to the first pressure regulating valve 1 a and to the other first duct 10. And a second pressure regulating valve 1b.

  The first pressure regulating valve 1 a has an inlet port connected to one first duct 10 between the outlet port of one pressure regulating valve 100 and the inlet port of one check valve 101.

  The second pressure regulating valve 1b has an outlet port connected to the other duct 10 between the exhaust side of the other blower F2 and the inlet port of the other pressure regulating valve 100. The outlet port of the first pressure regulating valve 1 a and the inlet port of the second pressure regulating valve 1 b are connected by the first bypass duct 1.

  The second bypass duct 2 includes the other first duct 10 between the outlet port of the other pressure regulating valve 100 and the inlet port of the other check valve 101, the exhaust side of one blower F2, and one pressure. One duct 10 between the inlet port of the regulating valve 100 is connected.

  The second bypass duct 2 is connected to the first pressure regulating valve 2a connected to the other first duct 10 and to the first pressure regulating valve 2a and to the first first duct 10. And a second pressure regulating valve 2b.

  The first pressure regulating valve 2 a has an inlet port connected to the first duct 10 between the outlet port of one pressure regulating valve 100 and the inlet port of one check valve 101.

  The second pressure regulating valve 2b has an outlet port connected to one duct 10 between the exhaust side of one blower F1 and the inlet port of one pressure regulating valve 100. The outlet port of the first pressure regulating valve 2 a and the inlet port of the second pressure regulating valve 2 b are connected by the second bypass duct 2.

  The first pressure regulating valve 1a and the second pressure regulating valve 1b of the first bypass duct 1 and the first pressure regulating valve 2a and the second pressure regulating valve 2b of the second bypass duct 2 constitute the switching means 3. The By this switching means 3, the blowing path from the blower is switched to one of the first bypass duct 1 and the second bypass duct 2 corresponding to the blower being driven.

  Below, the usage aspect of the ventilation system with a fretting prevention function concerning this embodiment is demonstrated. When one blower F1 is driving and the other blower F2 is stopped, a part of the blown air sent from the driven blower F1 is sent to the stopped blower F2 via the bypass system X. As a result, the stopped blower F2 rotates at a slow speed. As a result, local damage (fretting) of the shaft of the stopped blower F2 due to vibration of the driven blower F1 is prevented.

  As described above, according to the present invention, when driving of at least one of the plurality of fans is stopped, a part of the air sent from the driving fan is stopped via the bypass system X. Therefore, the fretting of the stopped blower can be prevented.

  In addition, this invention is not limited to the said embodiment, Of course, a various change can be added in the range which does not deviate from the summary of this invention.

  For example, in the case of the embodiment, the first bypass duct 1 of the bypass system X is connected to any one of the fans F1, and the second bypass duct 2 of the bypass system X is connected to the other fans F2. However, as shown in FIG. 2, the first bypass duct 1 can be blown to any one of the blowers so that the blades W of the blower F1 can be blown to a position where the blades W are rotated toward the first duct 10 in the rotation direction. The second bypass duct 2 is connected to the casing C1 of F1 and the second bypass duct 2 can be blown to a position where the blade W of the blower F2 is rotated in the rotation direction of blowing toward the first duct 1. You may make it connect to the casing C2 of the air blower F2.

  In this case, the blade W of the stopped blower rotates in the forward direction (the same direction as when driven) by a part of the blown air sent from the driven blower, and the suction side of the stopped blower is negative pressure And the exhaust side becomes positive pressure. That is, the direction of the wind from the stopped blower becomes the same as the direction of the wind from the driven blower to the blow target. Thereby, the wind which flows toward the 2nd duct 11 from the 1st duct 10 connected to the air blower during drive can be prevented from being sucked into the 1st duct 10 connected to the air blower currently stopped. As a result, the necessary air can be blown to the second duct 11.

  Moreover, in the case of the said embodiment, although demonstrated taking the case of two air blowers for convenience, three or more may be sufficient.

  Moreover, in the said embodiment, although the 1st bypass duct 1 and the 2nd bypass duct 2 assumed that one part was shared, each may be independent.

  X ... bypass system, 1 ... first bypass duct, 1a ... first pressure regulating valve, 1b ... second pressure regulating valve, 2 ... second bypass duct, 2a ... first pressure regulating valve, 2b ... second pressure regulating valve DESCRIPTION OF SYMBOLS 3 ... Switching means, 10 ... 1st duct, 11 ... 2nd duct, F1, F2 ... Blower, C1, C2 ... Casing, V ... Burner (blower object)

Claims (3)

A plurality of blowers;
A plurality of first ducts connected to each of the blowers;
A second duct obtained by merging a plurality of first ducts, the second duct extending toward a blow target,
A fretting system for a blower comprising: a bypass system that sends a part of wind from the driven blower to the stopped blower when driving of at least one of the plurality of blowers is stopped Blower system with prevention function.   The bypass system includes a first bypass duct connecting at least one first duct and at least one other first duct or a blower connected to the other first duct, and at least one of the above. Two other first ducts and at least one of the first ducts or a second bypass duct connected to the blower connected to at least one of the first ducts, corresponding to the fan being driven The blower system with a fretting prevention function for a blower according to claim 1, further comprising a switching unit that switches a blower path in the bypass system to one of a first bypass duct and a second bypass duct. The first bypass duct is connected to the casing of any one of the blowers so that the blades of the blower can be blown to a position where the blades of the blower are rotated toward the rotation direction of blowing toward the first duct.
The second bypass duct is connected to the casing of any one other blower so as to be blown to a position where the blades of the blower are rotated toward the rotational direction of blowing toward the first duct. A blower system with a fretting prevention function for a blower according to claim 2.

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