JPH04347497A - Washing body collecting device for tube type heat exchanger - Google Patents

Abstract

PURPOSE:To provide a washing bodies collecting device for tube type heat exchanger, which is capable of recovering washing bodies with a high recovery rate against the temporary inflow of large amount of dropped substance as well as the deviated flow and high-speed flow from upstream side in a cooling water system. CONSTITUTION:The title device is provided with a flow regulating member 5, a shielding member 8 for directing a flow toward a central part and a collecting lattice 2 having a slanted angle larger than the same of prior art.

Description

[Detailed description of the invention]

0001

[Industrial Application Field] The present invention is a tubular heat exchanger for cleaning the inside of a heat transfer tube of a heat exchanger by putting a cleaning body such as a sponge ball into cooling water, and then collecting the cleaning body. The present invention relates to a cleaning body collection device.

0002

[Prior Art] A conventional device is disclosed in Japanese Patent Application Laid-Open No. 58-18641.
As described in Publication No. 1, the lower part of the collection grid is used as a collection container, and a guide member is provided in the range of the obliquely extending end of the collection container,
Filter devices are known in which the width of the guide member is narrower than the spacing of the side walls of the collection container and is oriented in the direction of the outlet of the cleaning member, separating the cleaning member from the cooling water flow. However, this known technology has two drawbacks: that the cleaning member can be stably collected against drifting flow from the upstream side, and that a large amount of foreign matter (for example, fallen shellfish from the cooling water outflow wall surface) is temporarily collected from the upstream side.
There was a problem in that the cleaning member outlet, which opens toward the upstream side, was blocked by the inflow of the cleaning member.

On the other hand, as described in Japanese Utility Model Application Publication No. 62-192098, the cleaning body collected at the downstream end of the grid is sucked upstream, and the cleaning body extraction tube is inserted into the space narrowed by the collection grid. A cleaning body collection device configured to be installed is known.

[0004] However, this known technique does not take into account the point of stably collecting the cleaning body against drifting flows from the upstream side and temporary high flow velocities.

[0005]

[Problems to be Solved by the Invention] The problem with the above conventional technology is that stable collection cannot be achieved due to the fact that cleaning bodies adhere to the collection grid in the case of drifting flow from the upstream side and high flow rate operation. Sufficient consideration has not been given to the fact that the cleaning body outlet is blocked due to the temporary inflow of a large amount of foreign matter, and there is a problem that the cleaning body recovery performance (cleaning body recovery rate) decreases. Ta.

The object of the present invention is to improve the technical drawbacks of the known examples and to satisfy the requirements, the cleaning body does not adhere to or stagnate on the collection grid, it can collect stably, and a large amount of foreign matter can be collected. Even if water flows in, the cleaning body outlet will not be blocked.
It is an object of the present invention to provide a tubular heat exchange cleaning body collection device that can obtain a high cleaning body recovery rate.

[0007]

[Means for solving the problem] In order to stably collect the cleaning body against the above-mentioned uneven flow on the upstream side, a space between the collection grids is provided along the center which roughly bisects the cooling water flow path. A rectifying member was installed.

In addition, in order to prevent the cleaning body outlet from being blocked due to a large amount of foreign matter temporarily flowing in from the upstream side, a rectifying part vane is provided at the lower end of the rectifying member, and the cleaning body is A cleaning body extraction tube was installed on the upstream side.

[0009] Furthermore, in order to prevent the cleaning body from being caught between the many crosspieces forming the grid and reducing the collection efficiency, the inclination of the collection grid is made larger than in the prior art.

Furthermore, by directing the upstream flow toward the inlet of the cleaning body extraction pipe and making it intersect with the straight flow, the flow near the collection grid is made turbulent, thereby preventing the cleaning body from adhering to the collection grid. In order to prevent this and increase the cleaning body recovery efficiency, a shielding member with a certain degree of inclination was installed above the collection grid.

[0011]

[Operation] The rectifying member functions to rectify the flow line on the inlet side of the body of the cleaning body collecting device against the drifting flow from the upstream side. As a result, the cleaning body flows straight into the collector body along the rectified streamlines, and the cleaning body flows toward the cleaning body extraction pipe inlet due to the streamlines that have passed through the shielding member. , the component flowing perpendicularly to the collection grid surface becomes smaller, and it is possible to prevent the cleaning body from adhering to and stagnation on the collection grid surface. Furthermore, even if the cleaning body adheres to or stagnates on the collection grid surface, by making the straight flow intersect with the streamline that has passed through the shielding member, the flow near the collection grid can be made turbulent, and the cleaning body can be removed. Can be done.

[0012] The cleaning body extraction pipe that sucks up the cleaning body to the upstream side has an extraction port facing the downstream side, so even if a large amount of foreign matter temporarily flows in from the upstream side, the foreign matter will not flow along the main stream. captured by a collection grid. Thereby, only the cleaning body can be sucked up at the cleaning body extraction port.

[0013] Furthermore, the rectifier vane provided at the lower end of the rectifier member has a gap between it and the collection grid that is larger than the maximum diameter of the cleaning body.
They are placed at appropriate intervals. As a result, large inflow foreign particles are captured between the rectifier vanes and the collection grid, and only the cleaning material flows into the duct and is sucked up by the cleaning material extraction pipe, so the extraction port will not be clogged. do not have.

[0014] Furthermore, since the inclination of the collection grid was made larger than that of the prior art, it was necessary to extend the body length of the collection device, but since a shielding member was provided above the collection grid, the body length of the collection device was can be made equal to or lower than that of the prior art.

[0015]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to FIGS. 1 to 7. In these figures, the cleaning body collection device mainly includes a body 1, a collection grid 2 for preventing cleaning bodies from flowing downstream, and a cleaning body extraction pipe 3 for collecting cleaning bodies.
, a duct 4 for guiding the cleaning body to the extraction pipe, a rectifying member 5 for rectifying streamlines, a rectifying vane 6 for trapping inflow foreign matter, and the like. The body 1 has a flange structure at both ends so that it can be connected to a cooling water pipe from a condenser (not shown). A cleaning body extraction pipe 3 is installed in the center of the body 1 in the axial direction, and a flange is attached to the outer end of the body to be connected to a cleaning body circulation system (not shown). The inner end of the body opens toward the downstream side of the cooling water, and serves as a cleaning body extraction port 7 facing a duct 4 formed by a pair of collection gratings.

The duct 4 has a substantially flat plate-like cross section, and its lowermost end is a flat plate facing the cleaning body extraction port 7 of the cleaning body extraction pipe 3, and the width of the duct 4 and the cleaning body extraction pipe are The inner diameters of No. 3 are large enough to allow a cleaning object s such as a sponge ball to easily pass through.

The collection grid 2 has a large number of bars arranged side by side at appropriate intervals along the flow direction of the cooling water, connected to the duct 4 at the lower end, and arranged symmetrically on the upstream side of the flow. These crosspieces extend from the duct 4 toward the upstream side at the cleaning body collection position, and are inclined at appropriate angles so that the opposing collection grids 2, 2 form a V-shape. A shielding member 8 is installed at the upper end. The shielding member 8 is in almost contact with the inner wall of the body 1, and the cleaning body s flows in the direction of the cleaning body extraction port 7 due to the streamline passing through the shielding member 8, so that it does not touch the collection grid 2. , the component flowing at right angles becomes smaller, and it is possible to prevent the cleaning body s from adhering to the collection grid 2 and becoming stagnant. Furthermore, even if the cleaning body s adheres to the collection grid 2 and stagnates, by intersecting the straight flow and the streamline that passed through the shielding member 8, the flow near the collection grid 2 is made turbulent, and the cleaning body s can be removed. Further, a collection grid shaft 9 is fixed to the collection grid 2, and one end of this collection grid shaft 9 protrudes outside the body 1, and a collection grid handle 10 is attached to the collection grid shaft 9.
is connected to. Therefore, this collection grid handle 10
The collection grid 2 can be swung by operating the . When collecting the cleaning body, the collecting grid 2 is made into a V-shape, and when not collecting it, it is made into a V-shape (dotted chain line). A vertical flat plate 11 is provided close to the crosspiece at the side edge of the collection grid 2.

The rectifying member 5 is formed along the center that roughly bisects the cooling water channel in the space between the collecting grids 2, and is connected to the cleaning body extraction pipe 3 at the center of the body 1, and the other end is connected to the cleaning body extraction pipe 3. are connected to the vertical flat plate 11. Therefore, the rectifying member 5 acts to rectify the streamlines on the inlet side of the body of the cleaning body collection device against the drifting flow from the upstream side, and even if the cleaning body adheres to the collection grid surface and stagnates, the rectification member By making the rectilinear flow rectified by the member 5 intersect with the streamline passing through the shielding member 8, the flow near the collection grid is made turbulent, and the cleaning body can be removed.

On the other hand, a rectifying vane 6 is provided at the downstream end of the rectifying member 5, and maintains an interval at which it can easily roll within the duct 4, and forms both slopes in a valley shape with the lowest point at the center. The lowermost end thereof is connected to the cleaning body extraction port 7 at the inner end of the body of the cleaning body extraction pipe 3. Therefore, the flow on the collection grid surface and in the duct 4 is disturbed by the rectifier vane 6, and it is possible to prevent the cleaning body from adhering to the grid or stagnation in the duct 4. Moreover, since the extraction port 7 of the cleaning body extraction pipe 3 that sucks up the cleaning body toward the upstream side faces the downstream side, even if a large amount of foreign matter, etc. temporarily flows in from the upstream side, the foreign matter will flow along the main stream. Only the cleaning body is captured by the collection grid 2 and sucked up by the extraction tube 3.

Further, the rectifier vane 6 is installed between the collecting grid 2 and the collecting grid 2 at an appropriate interval larger than the maximum diameter of the cleaning body. As a result, large inflow foreign particles are captured between the rectifier vane 6 and the collection grid 2, and only the cleaning material flows into the duct 4 and is sucked up by the cleaning material extraction pipe 3. The extraction port 7 will not be blocked.

In addition, as shown in FIG. 6, since the inclination of the collection grid 2 was made larger than that of the prior art (broken line), it was necessary to extend the body length L of the collection device, but the upper part of the collection grid 2 Since the shielding member 8 is provided, the body length L of the collection device can be made equal to or less than that of the prior art.

This effect will be explained using FIG. 7. As shown in FIG. 7, since the inclination of the collection grid 2 is made larger than that of the prior art (broken line), the component (W) flowing perpendicularly to the collection grid 2 becomes smaller, and the cleaning body s Since it is possible to prevent adhesion to and stagnation of the cleaning body, the recovery performance of the cleaning body (
The cleaning body recovery rate) is greatly improved.

[0023]

[Effects of the Invention] According to the present invention, the streamlines on the inlet side of the body of the cleaning body collection device can be rectified against the drifting flow from the upstream side, so that the cleaning body can be moved along the rectified streamlines. The cleaning body flows into the body of the collection device as a straight flow, and the streamlines passing through the shielding member cause the cleaning body to flow toward the entrance of the cleaning body extraction pipe, so that the components flowing at right angles to the collection grid surface are This makes it possible to prevent the cleaning body from adhering to and stagnation on the collecting grid surface. Furthermore, even if the cleaning body adheres to the collection grid surface and stagnates, the flow near the collection grid can be made turbulent by intersecting the straight flow and the streamlines that have passed through the shielding member.
Since the cleaning body can be removed, high recovery performance (high recovery rate) can be obtained.

[0024] Furthermore, since the rectifying vane is provided at the lower end of the rectifying member and the cleaning body is sucked upstream,
The extraction port faces downstream, and even if a large amount of foreign matter temporarily flows in from the upstream side, the foreign matter will be captured by the collection grid along the mainstream, so only the cleaning body will be exposed to the cleaning body extraction port. This prevents the extract from being sucked up and clogging the extraction port.

Furthermore, since the inclination of the collection grid was made larger than that of the prior art, it was necessary to extend the body length of the collection device, but since a shielding member was provided above the collection grid, the body length of the collection device can be made equal to or lower than that of the prior art.

[Brief explanation of the drawing]

FIG. 1 is a longitudinal sectional view showing one embodiment of the present invention.

FIG. 2 is a sectional view taken along line II-II in FIG. 1.

FIG. 3 is a sectional view taken along line III-III in FIG. 1;

FIG. 4 is a sectional view taken along line IV-IV in FIG. 1;

FIG. 5 is a partially cutaway perspective view showing the embodiment of FIG. 4;

FIG. 6 is a cross-sectional view showing the difference in inclination and body length between an embodiment of the present invention and the conventional technology.

FIG. 7 is an explanatory diagram showing the flow components to the collection grid due to the difference in slope between one embodiment of the present invention and the prior art.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1... Body, 2... Collection grid, 3... Cleaning body extraction pipe, 4... Duct, 5... Rectifying member, 6... Rectifying part vane, 7... Cleaning body extraction port, 8... Shielding member, 9... Collection grid axis , 10... Collection grid shaft handle, 11... Vertical flat plate.

Claims (3)

[Claims] Claims: 1. A collection grid provided in a cooling water flow path to collect the cleaning material that has been introduced into the cooling water and washed inside the heat exchanger tubes of a heat exchanger, and a collection grid that is collected by the collection grid. A cleaning body collection device for a tubular heat exchanger having a cleaning body extraction pipe for extracting the cleaning body into the cooling water flow path, a rectifying member formed along a center line that approximately bisects the cooling water flow path; , a rectifier vane provided at the downstream end of the rectifier member, a shielding member provided at the upstream portion of the collection grid, and an appropriate distance from the rectifier vane, and a location where the extraction pipe opening is installed. A tubular heat exchanger characterized by having a slope that slopes upstream toward the inner wall of the cooling water flow path in mutually opposite directions with the lowest point at the lowest point, and a duct that opens wide toward the upstream side of the cooling water. Cleaning body collection device for exchangers. 2. According to claim 1, the collection grid has a structure in which a large number of crosspieces are arranged side by side at appropriate intervals so as to be in contact with the duct and extend at an angle so as to expand toward the upstream side. A pair of collection gratings that are swingably supported in the cooling water flow path while facing each other while maintaining an appropriate distance from the rectifier vanes, and when the collector lengths are the same, Cleaning body collection device for tubular heat exchangers with a large inclination angle of the grid. 3. The cleaning body collection device for a tubular heat exchanger according to claim 1, wherein the shielding member provided above the collection grid is in contact with the body and has no part through which fluid passes through the pipe.