JP2011257039A - Drain recovery apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a drain recovery apparatus in which a drain in a drain reservoir part is made to flow into a bucket, consequently the bucket is reliably and quickly sank to normally operate the apparatus.SOLUTION: The drain recovery device includes: a tank body 1; the bucket 9 disposed in the tank body 1 to maintain a gap; a drain inflow pipe 3; a drain outflow pipe 4 with a suction port 4a placed in the bucket 9; and a pressurization valve 7 and an exhaust valve 8 which are opened or closed in accordance with floating up or sinking of the bucket 9. An annular large-diameter peripheral wall 10 which is located and expanded in association with the floating up or sinking stroke of the bucket 9 and has an inner diameter larger than the inner diameter of the lower part of the tank body, is formed in the upper part of the tank body 1, thereby forming the drain reservoir part 11 in a space between the outer circumference face of the floated up bucket 9 and the inner circumference face of the annular large-diameter peripheral wall 10. The drain reservoir part 11 secures drain of such a volume that the bucket 9 loses buoyancy and sinks at once by the drain flowing in the space at a time and having such a volume.

Description

  The present invention relates to a drain recovery device that recirculates drain discharged from steam utilizing equipment that uses steam as a heat source to a boiler, or recirculates drain that is low-pressure drain and cannot be recovered at a predetermined place by self-pressure. Is.

  Conventionally, this kind of drain recovery device includes a device related to the present applicant as shown in Non-Patent Document 1, for example. In this drain recovery device, the tank body is formed in a substantially vertical cylindrical shape. Normally, an upward bucket or a downward bucket is used for the drain recovery device. Here, the drain recovery device using the upward bucket is shown in FIG. 4 and its structure and operation state will be described. That is, the drain recovery device includes a vertical cylindrical tank main body a in which drain discharged from the steam utilization device is stored, a bucket b disposed in the tank main body a and having an open upper surface, and a tank main body a. A drain inflow pipe c connected to the tank body a, a suction outlet e connected to the tank body a in the bucket b and discharging the drain in the bucket b, and a bucket provided in the tank body a. and a pressurizing valve g and an exhaust valve h that are opened and closed via a link mechanism f attached to the tank body a as b rises or falls.

  Then, the drain flows into the tank body a through the drain inflow pipe c. This drain initially accumulates in the gap S between the tank body a and the bucket b, and the bucket b rises due to its buoyancy as the drained drain increases. At this time, the pressurizing valve g is closed and the exhaust valve h is open. In this state, when the water level of the drain further rises, the bucket b finally reaches the upper end position as shown by the chain line in FIG. 4, and the drain flows into the bucket b from the upper end edge. Thereby, the buoyancy of the bucket b is lost and the bucket b sinks as shown by the solid line in FIG. Along with this, the pressurizing valve g is opened via the link mechanism f, the pressurized gas flows into the tank body a, and the exhaust valve h is closed at the same time. In this way, the pressure in the tank body a is increased, and the drain in the bucket b is discharged to the outside of the tank body a through the drain outlet pipe d. When the drain in the bucket b is discharged, the bucket b gains buoyancy and rises again, and the inflowing drain increases to wait for the drain to flow into the bucket b.

Taiyo Valve Co., Ltd., main production item “Drain recovery machine”, [online], [Search June 2, 2010], Internet <URL: http: // www. ovk. jp / doren. html>

  However, in the conventional drain recovery device, the amount of drain in the tank main body a increases, the bucket b floats and reaches the upper end position, and if further drain flows into the tank main body a in this state, the bucket Drain begins to flow into b from its upper edge. At this time, if the amount of drain flowing into the bucket b is little by little, the bucket b sinks in proportion to the weight of the drained drain, so that the sinking amount is also small. Here, since the pressurizing valve g is opened via the link mechanism f in conjunction with the lowering operation of the bucket b, if the lowering operation of the bucket b is slow, the opening degree of the pressurizing valve g is small and the tank body a is moved. The amount of the pressurized gas flowing in becomes very small, and it becomes difficult to obtain a pressure sufficient to discharge the drain accumulated in the bucket b to the outside through the drain outlet pipe d.

  On the other hand, the inside of the tank body a becomes higher than the inflow pressure due to the pressurized gas flowing into the tank body a, and the drain cannot flow into the tank body a any more via the drain inflow pipe c. Incidentally, a check valve is attached to the tank body side of the drain inflow pipe c so that the pressure in the tank body a does not leak to the inflow side. If the inflow of the drain into the tank main body a stops, the inflow of the drain into the bucket b also stops, and the bucket b no longer sinks. That is, there is a problem that the equilibrium state is maintained and the operation becomes impossible, and normal operation cannot be performed. These problems are caused by a necessary amount of drain not being ensured between the inner peripheral surface of the tank main body a and the outer peripheral surface of the bucket b.

  Therefore, the present invention has been made to solve the above-described problem, and regardless of the amount of drain that flows in, the drain is allowed to flow into the bucket at once, and a drain having a capacity that allows the bucket to lose buoyancy and sink at once is secured. An object of the present invention is to provide a drain collecting device which forms a drain reservoir and allows the drain of the drain reservoir to flow into the bucket so that the bucket can settle down quickly and reliably and can operate normally. It is what.

  In order to achieve such an object, the drain recovery apparatus of the present invention includes a tank main body in which drain discharged from steam utilization equipment is stored, and an outer peripheral surface in the tank main body and an inner peripheral surface of the tank main body. A bucket with an upper surface opened so as to maintain a gap, a drain inflow pipe connected to the tank body, and a suction port connected to the tank body located in the bucket. A drain outlet pipe for discharging only the drain; and a pressure valve and an exhaust valve which are provided in the tank body and are opened and closed via a link mechanism attached to the tank body as the bucket floats or sinks. The drain flows into the tank body through the inflow pipe, and the drain flows into the floated bucket, so that the bucket loses buoyancy and sinks, via the link mechanism. The pressurizing valve is opened and the exhaust valve is closed, and the tank body is filled with pressurized gas through the pressurizing valve, and the drain in the bucket is placed outside the tank body through the suction port of the drain outlet pipe. A drain collecting device for discharging, and forming an annular large-diameter peripheral wall having an inner diameter larger than an inner diameter of a lower portion, which is expanded at a position corresponding to a stroke in which the bucket floats or sinks at an upper portion of the tank body, A drain reservoir is formed between the outer peripheral surface of the bucket and the inner peripheral surface of the annular large-diameter peripheral wall to secure a drain of a capacity that flows into the bucket at once and loses buoyancy and sinks all at once. It is characterized by that.

  The drain collecting apparatus according to the present invention forms an annular large-diameter peripheral wall having an inner diameter larger than the inner diameter of the lower portion, which is expanded at a position corresponding to a stroke in which the bucket floats or sinks at the upper portion of the tank body, A drain reservoir portion is formed between the inner peripheral surface of the annular large-diameter peripheral wall and in which a drain having a capacity that flows into the bucket at a time and loses buoyancy and sinks at once is secured. Therefore, the drain of the drain reservoir can be continuously flowed in from the upper end edge while lowering the bucket into the floated bucket, so that the bucket loses its buoyancy and sinks all at once. The drainage is discharged. In this way, normal operation of the drain recovery device is performed.

The perspective view of the drain collection | recovery apparatus which concerns on this invention. The longitudinal cross-sectional view which shows the same effect | action. The longitudinal cross-sectional view which shows the same effect | action. The longitudinal cross-sectional view of the conventional drain collection | recovery apparatus.

  Hereinafter, the best embodiment of the drain recovery apparatus according to the present invention will be described in detail with reference to the drawings. FIG. 1 is a perspective view of a drain collecting apparatus according to the present invention, and FIG. 2 is a longitudinal sectional view showing the same operation. The drain collecting device is composed of a vertical cylindrical tank body 1 whose inside is sealed by covering and fixing a cover plate 2 on the opened upper surface. The drain recovery apparatus according to the present invention operates, for example, various steam using devices using steam generated from a boiler (not shown), and when drained from the steam using device is recirculated to the boiler. Alternatively, it is used for recovering low-pressure drain.

  The tank body 1 has a lower cylinder part 1a as a lower part, and an upper cylinder part 1b as an upper part connected to the upper end of the lower cylinder part 1a and having a larger diameter than the lower cylinder part 1a. The upper tube portion 1b will be described in detail later. A drain inflow pipe 3 drawn from a steam utilization device (not shown) is connected to one side of the upper cylinder portion 1b in the tank body 1 so that the drain flows into the tank body 1 or falls naturally. On the other hand, a drain outflow pipe 4 is connected to one side of the lid plate 2 for discharging only the drain of the tank body 1, particularly the drain stored in a bucket 9 described later. For this reason, the drain outlet pipe 4 is located in a bucket 9 whose suction port 4 a is disposed in the tank body 1. A gas supply pipe 5 that supplies pressurized gas into the tank body 1 and a gas discharge pipe 6 that discharges pressurized gas in the tank body 1 are connected to both sides of the center of the lid plate 2. The gas supply pipe 5 is connected to the lid plate 2 via a pressurizing valve 7, and the gas discharge pipe 6 is connected via an exhaust valve 8. The inlet of the drain inflow pipe 3 is provided in the upper cylinder portion 1b of the tank body 1 and is provided at a lower position than the cover plate 2 to reduce the inflow resistance of the drain. Further, the inlet of the drain inflow pipe 3 is positioned below the upper edge of the bucket 9 where the upper edge of the inner peripheral edge sinks to the bottom of the tank body 1.

  A bucket 9 is disposed in the tank body 1. The bucket 9 is formed of a bottomed cylinder with an upper surface 9 a opening, and enters the lower cylinder portion 1 a in the tank body 1. A slight gap S is maintained between the inner peripheral surface of the lower cylinder portion 1 a and the outer peripheral surface of the bucket 9 in the tank body 1. The drain that first flows into the tank body 1 accumulates in the gap S and rises. Therefore, the bucket 9 obtains its buoyancy by raising the water level of the drain in the tank body 1 and floats in the tank body 1. The inner diameter of the lower cylinder portion 1a in the tank body 1 is set to 204.7 mm, for example, and the height is set to 165 mm, for example. Moreover, the internal diameter of the upper cylinder part 1b in the tank main body 1 is set, for example to 254.2 mm, and the height is set to 102 mm. The bucket 9 can move up and down within the height range of the upper tube portion 1b. The drain outlet pipe 4 has a suction port 4a interposed in the bucket 9, but the bucket 9 moves up and down due to buoyancy and moves up and down, so that the operation of the drain 9 in the bucket 9 is not disturbed. The position of the suction port 4a is set so that the water can be sufficiently absorbed and discharged.

  Thus, the upper cylinder part 1b in the tank main body 1 is expanded, and the annular large-diameter peripheral wall 10 having an inner diameter larger than the inner diameter of the lower cylinder part 1a is formed. Further, the height, that is, the height 102 mm of the upper tube portion 1 b is set so as to correspond to the stroke at which the bucket 9 floats or sinks. A drain reservoir 11 is formed between the outer peripheral surface of the bucket 9 and the inner peripheral surface of the annular large-diameter peripheral wall 10. When the bucket 9 reaches the upper end position, the drain reservoir 11 secures a drain having a capacity such that the bucket 9 flows into the bucket 9 at a time and loses buoyancy and sinks at once. It is for keeping.

  A link mechanism 12 that opens and closes the pressurizing valve 7 and the exhaust valve 8 as the bucket 9 floats or sinks is provided on the back side of the lid plate 2. That is, a first support rod 13a and a second support rod 13b are respectively suspended downwardly on the back surface of the lid plate 2 so as to be close to the pressurizing valve 7 and the exhaust valve 8, and these first and second support rods 13a and 13b. The first link 14 and the second link 15 are pivotally attached to the lower end portions of the upper and lower ends, respectively, so as to freely rotate up and down. On the other hand, a vertical rod 16 is provided at the center of the inner bottom surface of the bucket 9 so as to stand upward. The vertical rod 16 protrudes upward from the upper surface of the lid plate 2. The projecting portion is inserted into a cylindrical guide tube 17 that is erected on the lid plate 2 and has a lower end that opens below the lid plate 2. Although the vertical hook 16 rises as the bucket 9 floats, the upper end of the vertical hook 16 comes into contact with the inner surface of the upper end of the guide tube 17 so that the bucket 9 stops at the upper end position. A vertical rod 16 near the back surface of the cover plate 2 is divided into an upper portion and a lower portion, and a pair of upper engagement rods 18 and 18 and lower engagement rods 19 and 19 project substantially horizontally. The upper engagement rods 18 and 18 and the lower engagement rods 19 and 19 are both provided vertically separated from each other by a predetermined distance.

  In the pressurizing valve 7, a first valve body 21 for opening and closing the first valve seat 20 is disposed above the first valve seat 20, and a first action piece 22 is suspended downward from the first valve body 21. Is done. The first working piece 22 penetrates the first valve seat 20 and extends downward, and a pair of upper and lower flanges 23 and 23 are provided around the lower end of the first acting piece 22 so as to be separated from each other by a predetermined distance. The exhaust valve 8 includes a second valve body 25 that opens and closes the second valve seat 24 below the second valve seat 24, and a second action piece 26 that extends downward from the second valve body 25. It is suspended. A pair of upper and lower flanges 27 and 27 are also provided around the lower end portion of the second action piece 26 so as to be separated from each other by a predetermined distance.

  The inner end portion 14 a of the first link 14 is interposed between a pair of lower engagement rods 19, 19 located at the lower portion of the vertical rod 16, and the outer end portion 14 b is also from the first valve body 21 in the pressurizing valve 7. It is interposed between a pair of flanges 23 and 23 of the suspended first action piece 22. Thereby, for example, when the vertical rod 16 rises as the bucket 9 floats, the first link 14 rotates counterclockwise in FIG. 2, and the first valve body 21 descends as the first action piece 22 descends. The first valve seat 20 is closed. On the other hand, when the vertical rod 16 descends as the bucket 9 sinks, the first link 14 rotates clockwise in FIG. 2, and the first valve element 21 rises as the first action piece 22 rises. Open the valve seat 20.

  Further, the inner end 15 a of the second link 15 is interposed between a pair of upper engaging rods 18, 18 positioned at the upper portion of the vertical rod 16, and the outer end 15 b is also from the second valve body 25 in the exhaust valve 8. It is interposed between a pair of flanges 27, 27 of the second working piece 26 that is suspended. Then, as the bucket 9 rises as the bucket 9 rises, the second link 15 rotates in the clockwise direction in FIG. 2, and the second valve body 25 descends as the second action piece 26 descends. Open the valve seat 24. In contrast, when the vertical rod 16 descends as the bucket 9 sinks, the second link 15 rotates counterclockwise in FIG. 2, and the second valve body 25 rises as the second action piece 26 rises. Then, the second valve seat 24 is closed.

  The drain recovery apparatus according to the present invention has the above-described configuration, and the operation thereof will be described next. First, the drain W that has flowed in from the drain inflow pipe 3 accumulates in the gap S between the inner peripheral surface of the lower cylinder portion 1 a and the outer peripheral surface of the bucket 9 in the tank body 1. Further, when the amount increases, the water level of the drain W is between the inner peripheral surface of the annular large-diameter peripheral wall 10 that is the upper cylindrical portion 1b in the tank body 1 and the outer peripheral surface of the bucket 9 as shown in FIG. Reach up to. Then, the bucket 9 stops at a position where it rises in proportion to its buoyancy. In this state, the first valve seat 20 of the pressurizing valve 7 is closed by the first valve body 21 via the link mechanism 12 as the bucket 9 floats, and the inflow of the pressurized gas is stopped. At the same time, the second valve seat 24 in the exhaust valve 8 is opened when the second valve body 25 is lowered. Further, the drain W does not flow into the bucket 9.

  In this state, when the drain W continuously flows into the tank body 1 through the drain inflow pipe 3, the bucket 9 reaches the upper end position of the solid line in FIG. However, the drain W continues to increase further, and finally flows into the bucket 9 from the edge of the opening 9 a at the upper end of the bucket 9. At this time, the capacity between the outer peripheral surface of the bucket 9 and the inner peripheral surface of the annular large-diameter peripheral wall 10 in the tank body 1 is such that the bucket 9 flows into the bucket 9 at once and loses buoyancy and sinks all at once. Since the drain reservoir 11 for securing the drain is formed, the drain W accumulated in the drain reservoir 11 continuously flows into the bucket 9 while lowering the bucket 9.

  As a result, the drain W accumulates at once in the bucket 9 and the buoyancy is lost at the same time, and the bucket 9 sinks from the upper end position of FIG. 3 to the bottom of the tank body 1 as shown by the solid line. Along with this, the first valve body 21 of the pressurizing valve 7 rises through the link mechanism 12, the first valve seat 20 is opened, and the pressurized gas flows into the tank body 1 from the pressurizing valve 7. Then, the pressure in the tank body 1 is increased by the pressurized gas, and the drain W in the bucket 9 is discharged to the outside of the tank body 1 through the suction port 4 a of the drain outlet pipe 4. At this time, the exhaust valve 8 is closed. Although not shown, a check valve is provided in the drain inflow pipe 3 to prevent the pressurized gas from flowing back through the drain inflow pipe 3.

  When the drain W in the bucket 9 is discharged, buoyancy acts on the bucket 9 again, and the bucket 9 rises to a position that balances the buoyancy. When the bucket 9 rises, the first valve body 21 of the pressurizing valve 7 descends via the link mechanism 12 to close the first valve seat 20 and stop the inflow of pressurized gas. Further, the second valve body 25 of the exhaust valve 8 descends through the link mechanism 12 to open the second valve seat 24, and excess pressurized gas in the tank body 1 is removed from the tank body 1 through the gas discharge pipe 6. Discharge to the outside. In this way, the bucket 9 is positioned in balance with the buoyancy as shown by the chain line in FIG. Then, when the drain continuously flows into the tank body 1 through the drain inflow pipe 3, the bucket 9 rises and stops at the upper end position, and enters the bucket 9 from the edge of the opening 9 a at the upper end of the bucket 9. The drain W again flows in. Thereafter, the same operation as described above is repeated. The drain discharged from the drain recovery device is returned to a boiler (not shown).

  As described above, the drain recovery apparatus according to the present invention is configured such that the upper portion of the tank main body 1 is positioned to correspond to the stroke in which the bucket 9 floats or sinks, and expands outward. A drain having a capacity that forms a large-diameter peripheral wall 10 and flows into the bucket 9 at a time between the outer peripheral surface of the bucket 9 and the inner peripheral surface of the annular large-diameter peripheral wall 10 and the bucket 9 loses buoyancy and sinks all at once. The drain reservoir 11 is formed. Therefore, the drain of the drain reservoir 11 can be continuously flowed from the upper edge of the bucket 9 while descending into the bucket 9 that has floated, and the bucket 9 loses its buoyancy and sinks all at once. The drain in the bucket 9 is discharged. In this way, normal operation of the drain recovery device is performed.

  Further, in the present invention, the drain reservoir 11 formed on the upper portion of the tank body 1 as described above is configured so that the bucket 9 of the tank body 1 is lifted by the buoyancy of the bucket 9 that is drained and lightened. It also fulfills the function of quickly supplying the drain W downward. Furthermore, the tank main body 1 is formed by the large-diameter upper cylinder portion 1b and the small-diameter lower cylinder portion 1a. Thus, by reducing the inner diameter of the lower cylinder portion 1a, the volume in the tank main body 1 is increased. Since the operation of the drain recovery device is performed with a small volume of pressurized gas, the pressurized gas can be effectively used.

DESCRIPTION OF SYMBOLS 1 Tank main body 3 Drain inflow pipe 4 Drain outflow pipe 7 Pressurization valve 8 Exhaust valve 9 Bucket 10 Annular large-diameter peripheral wall 11 Drain reservoir 12 Link mechanism S Clearance W Drain

Claims (1)

The tank main body in which drainage discharged from the steam-utilizing device is stored, and the upper surface disposed in the tank main body so as to maintain a gap between the outer peripheral surface and the inner peripheral surface of the tank main body are opened. A bucket, a drain inflow pipe connected to the tank body, a drain outlet pipe connected to the tank body and having a suction port located in the bucket and discharging only the drain in the bucket, and provided in the tank body A pressure valve and an exhaust valve that open and close via a link mechanism that is attached to the tank body as the bucket floats or sinks;
The drain flows into the tank body through the drain inflow pipe, and the drain flows into the floating bucket, so that the bucket loses buoyancy and sinks, and the pressure valve opens through the link mechanism. The exhaust valve is closed, the pressurized gas is filled into the tank body through the pressurizing valve, and the drain in the bucket is discharged to the outside of the tank body through the suction port of the drain outlet pipe. A recovery device,
An annular large-diameter peripheral wall having an inner diameter larger than the inner diameter of the lower portion is formed by being expanded at a position corresponding to a stroke in which the bucket floats or sinks at an upper portion of the tank body, and an outer peripheral surface of the bucket and the annular large-diameter peripheral wall A drain collecting device, wherein a drain collecting portion is formed between the inner peripheral surface and a drain reservoir portion that secures a drain of a capacity that flows into the bucket at a time and loses buoyancy and sinks all at once.

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