JP6468411B1 - Double strainer type filter - Google Patents

Abstract

Provided is a double strainer type filter capable of easily removing foreign matters remaining on a strainer. The filter 10 can be switched to a state in which the upstream valve body 3 and the downstream valve body 4 are moved synchronously, or a state in which the upstream valve body 3 and the downstream valve body 4 are moved independently from each other, In the state in which the switching mechanism 5 disposed between the first screw feed mechanism Ms and the second screw feed mechanism 2Ms is provided and the upstream valve body 3 and the downstream valve body 4 are moved independently from each other, one filtration chamber By closing the inlet 1Ka of Ra, partially opening the outlet 2Ka of one filtration chamber Ra, and allowing the fluid to flow into one filtration chamber Ra from the outlet 2Kb of the other filtration chamber Rb, The strainer 2 disposed in the filtration chamber Ra can be backwashed. Thereby, it is possible to clean the strainer 2 without removing it from the casing 1.

Description

  The present invention relates to a double strainer type filter. In particular, the present invention relates to a structure of a double strainer type filter in which a set of strainers is arranged in parallel inside a casing via a partition wall.

  For example, in a thermal power plant, a large amount of seawater or river water is used to cool a plurality of cooling pipes arranged inside a condenser. By the way, since seawater or river water contains various foreign substances such as shellfish and algae, the intake system for cooling water such as seawater is provided with a filter to collect these foreign substances.

  In general, such a filter employs a system in which a strainer made of a filter net is disposed inside a casing and water is passed through the strainer to remove foreign matter. However, if such a filter is operated for a long period of time, the strainer may be clogged with foreign matter, or the foreign matter may stay inside the strainer, and the water supply capacity to the condenser may be reduced. . As a result, the operation of the thermal power plant may be stagnant.

  By the way, since a thermal power plant is required to operate at all times, when one set of strainers is placed inside the filter and foreign matter is filtered by one strainer, the other strainer can be maintained. A double strainer type double strainer type filter is disclosed (for example, see Patent Document 1).

Japanese Utility Model Publication No. 52-57378

  FIG. 10 is a plan view showing a configuration of a double strainer type filter according to the prior art, and shows a principal part in a cross-sectional view. FIG. 11: is a left view which shows the structure of the double strainer type filter by a prior art, and has shown the principal part with the longitudinal cross-sectional view. FIG. 12 is a front view showing the configuration of a conventional double strainer type filter. 10 to 12 of the present application correspond to FIGS. 1 to 3 of Patent Document 1. FIG.

  Referring to FIGS. 10 to 12, a conventional double strainer type filter (hereinafter simply referred to as a filter) 9 includes a casing 1 and a pair of truncated cylindrical strainers 8 and 8. The casing 1 includes a casing main body 11, an upstream bonnet 12, and a downstream bonnet 13. The casing 1 includes a pair of disk-shaped top covers 14a and 14b and a pair of cylindrical bottom covers 15a and 15b.

  Referring to FIG. 10 or FIG. 11, the casing body 11 has a pair of filtration chambers Ra and Rb partitioned by a partition wall Bh formed in a parallel state. Strainers 8 and 8 are installed in the filtration chambers Ra and Rb.

  Referring to FIG. 10 or FIG. 11, the upstream bonnet 12 is attached to one end surface of the casing body 11. The upstream bonnet 12 opens the inside so as to easily conduct a fluid such as seawater flowing from the upstream Su side. The upstream bonnet 12 circulates the fluid guided from the upstream Su side to the filtration chamber Ra or the filtration chamber Rb.

  Referring to FIGS. 10 to 12, the downstream bonnet 13 is attached to the other end face of the casing body 11. The downstream bonnet 13 opens the inside so that a fluid such as seawater flowing from the filtration chamber Ra or the filtration chamber Rb can easily flow out. And the downstream bonnet 13 can flow out to the downstream Sd side in a state where the fluid flowing from the filtration chamber Ra or the filtration chamber Rb collects foreign matter.

  Referring to FIGS. 10 to 12, the pair of top covers 14 a and 14 b are detachably fixed to the upper surface of the casing body 11. One top cover 14a seals the upper opening of the filtration chamber Ra. When one top cover 14a is removed from the casing body 11, the strainer 8 installed in the filtration chamber Ra can be taken out. Then, the foreign matter remaining on the strainer 8 can be removed.

  Referring to FIGS. 10 to 12, the other top cover 14b seals the opening at the top of the filtration chamber Rb. When the other top cover 14b is removed from the casing body 11, the strainer 8 installed in the filtration chamber Rb can be taken out. Then, the foreign matter remaining on the strainer 8 can be removed. Although the top cover 14a and the top cover 14b are the same, they are distinguished by changing the reference numerals for convenience of explanation.

  Referring to FIG. 11 or FIG. 12, the pair of bottom covers 15 a and 15 b are fixed to the bottom surface of the casing body 11. The pair of bottom covers 15a and 15b constitute part of the filtration chambers Ra and Rb. The pair of bottom covers 15a and 15b has a bottom plate 151 attached to the bottom.

  Referring to FIG. 11 or FIG. 12, when one bottom plate 151 is removed from the bottom cover 15a, foreign substances such as shellfish and algae staying at the bottom of the filtration chamber Ra can be discharged together with the fluid from the discharge port 15v. When the other bottom plate 151 is removed from the bottom cover 15b, foreign matter such as shellfish and algae staying at the bottom of the filtration chamber Rb can be discharged together with the fluid from the discharge port 15v.

  11 or 12, the pair of bottom covers 15a and 15b fixes a pair of stands 17 and 17 to the outer periphery thereof. The filter 9 can be supported on the installation surface by fixing these stands 17 and 17 to the installation surface using anchor bolts.

  Referring to FIG. 11 or FIG. 12, the filter 9 includes a communication rod 16. The communication rod 16 communicates the bottom cover 15a and the bottom cover 15b. On the path of the communication rod 16, a gate valve 16v is provided. When the gate valve 16v is opened, the fluid in the filtration chamber Ra and the fluid in the filtration chamber Rb can be mutually circulated. When the gate valve 16v is closed, the flow of the fluid in the filtration chamber Ra and the fluid in the filtration chamber Rb can be blocked.

  Referring to FIG. 10 or FIG. 11, the filter 9 further includes an upstream valve body 3 and a downstream valve body 4. The upstream valve body 3 is disposed between the upstream bonnet 12 and one end face of the casing body 11. The upstream valve body 3 is disposed so as to be capable of reciprocating between the filtration chamber Ra and the filtration chamber Rb by a first screw feed mechanism 1Ms described later. The downstream valve body 4 is disposed between the downstream bonnet 13 and the other end surface of the casing body 11. The downstream valve body 4 is disposed so as to reciprocate between the filtration chamber Ra and the filtration chamber Rb by a second screw feed mechanism 2Ms described later.

  With reference to FIG. 10 or FIG. 11, in a state where the upstream valve body 3 has moved to the filtration chamber Rb side, the upstream valve body 3 closes the inlet 1Kb of the filtration chamber Rb, thereby circulating from the upstream Su side. Can be prevented from flowing into the filtration chamber Rb. In the state where the upstream valve body 3 has moved to the filtration chamber Rb side, the upstream valve body 3 opens the inlet 1Ka of the filtration chamber Ra, so that the fluid flowing from the upstream Su side can flow into the filtration chamber Ra.

  With reference to FIG. 10 or FIG. 11, in the state where the upstream valve body 3 has moved to the filtration chamber Ra side, the upstream valve body 3 can open the inlet 1Kb of the filtration chamber Rb, and the upstream valve body 3 is filtered. The inlet 1Ka of the chamber Ra can be closed.

  With reference to FIG. 10 or FIG. 11, in the state where the downstream valve body 4 has moved to the filtration chamber Rb side, the downstream valve body 4 closes the outlet 2Kb of the filtration chamber Rb, so that it is accommodated in the filtration chamber Rb. Can be prevented from flowing out to the downstream Sd side. In the state where the downstream valve body 4 has moved to the filtration chamber Rb side, the downstream valve body 4 opens the outlet 2Ka of the filtration chamber Ra, so that the fluid flowing from the upstream Su side through the filtration chamber Ra is allowed to flow. It can flow out to the downstream Sd side.

  With reference to FIG. 10 or FIG. 11, in the state where the downstream valve body 4 has moved to the filtration chamber Ra side, the downstream valve body 4 can open the outlet 2Ka of the filtration chamber Rb, and the downstream valve body 4 is filtered. The outlet 2Ka of the chamber Ra can be closed.

  10 to 12, the filter 9 includes a first screw feed mechanism 1Ms and a second screw feed mechanism 2Ms. The first screw feed mechanism 1Ms can reciprocate the upstream valve body 3 between the filtration chamber Ra and the filtration chamber Rb. The second screw feed mechanism 2Ms can reciprocate the downstream valve body 4 between the filtration chamber Ra and the filtration chamber Rb.

  Since the first screw feed mechanism 1Ms and the second screw feed mechanism 2Ms are configured in the same manner, the configuration of the screw feed mechanism will be mainly described as a representative of the second screw feed mechanism 2Ms.

  Referring to FIGS. 10 to 12, the second screw feed mechanism 2Ms includes a feed screw Sf, a gear box Bg, and a handle Hd. Both ends of the feed screw Sf are rotatably held by the downstream bonnet 13. Further, the feed screw Sf is screwed with a female screw portion 41 protruding to the back side of the downstream valve body 4. When the feed screw Sf is rotated, the downstream valve body 4 can be moved along the feed screw Sf.

  Referring to FIGS. 10 to 12, both ends of the feed screw Sf are rotatably held by the upstream bonnet 12. Further, the feed screw Sf is screwed with a female screw portion 31 protruding to the back side of the upstream valve body 3. When the feed screw Sf is rotated, the upstream valve body 3 can be moved along the feed screw Sf.

  Referring to FIGS. 10 to 12, the gear box Bg includes a pair of bevel gears (not shown) that mesh with each other. One bevel gear (not shown) is fixed to the central axis of the handle Hd. The other bevel gear (not shown) is fixed to the extension shaft of the feed screw Sf. A pair of bevel gears (not shown) can transmit the rotation of the handle Hd to the feed screw Sf.

  Referring to FIG. 10, the filter 9 further includes a connecting rod Rc. The connecting rod Rc is disposed between the pair of gear boxes Bg and Bg. The connecting rod Rc can transmit the rotation of one handle Hd to the other handle Hd.

  When the one handle Hd is rotated in one direction from the state shown in FIG. 10, the upstream valve body 3 and the downstream valve body 4 can be moved to the filtration chamber Ra side in conjunction with each other. And the opening of the both ends of filtration chamber Ra can be closed. On the other hand, when one handle Hd is rotated in the other direction from the state in which the upstream valve body 3 and the downstream valve body 4 close the openings at both ends of the filtration chamber Ra, the upstream valve body 3 and the downstream valve body 4 can be linked to move to the filtration chamber Rb side. And the opening of the both ends of filtration chamber Rb can be closed.

  In this way, the filter 9 moves the upstream valve body 3 and the downstream valve body 4 in conjunction with each other by rotating the one handle Hd or the other handle Hd in the normal direction or the reverse direction. The inlets 1Ka and 1Kb and the outlets 2Ka and 2Kb of the chamber Rb can be alternatively opened and closed.

  Referring to FIG. 10 or FIG. 11, the strainer 8 has an upper surface opened and an outer periphery formed by a metal mesh 81 or the like. Further, the strainer 8 is configured with a perforated plate 82 at the bottom. Furthermore, the strainer 8 is provided with a U-shaped suspension handle 83 at the top.

  With reference to FIG. 10 or FIG. 11, in a state where the inlet 1Kb of the filtration chamber Rb and the outlet 2Kb of the filtration chamber Rb are closed, the fluid flowing in from the upstream Su side flows into the strainer 8 disposed in the filtration chamber Ra. After flowing from the upper surface to the inside and collecting foreign matter inside the strainer 8, it can flow out to the downstream Sd side. And the fluid by which the foreign material was collected can be supplied to a condenser, for example as a cooling medium.

  Referring to FIG. 10 or FIG. 11, when a fluid flows into the filtration chamber Ra and a water pressure on the upstream Su side and a differential pressure on the downstream Sd side are generated, the strainer 8 disposed in the filtration chamber Ra is clogged. Since the foreign matter is generated and foreign matter is generated at the bottom of the strainer 8, the upstream valve body 3 and the downstream valve body 4 are moved to the filtration chamber Ra side, and the foreign matter is filtered on the filtration chamber Rb side. While the foreign matter is being filtered on the filtration chamber Rb side, the foreign matter remaining on the strainer 8 disposed inside the filtration chamber Ra is removed.

  Referring to FIG. 10 or FIG. 11, when removing the foreign matter remaining in the strainer 8 disposed inside the filtration chamber Ra, conventionally, the top cover 14 a is removed from the casing body 11 (see FIG. 12), and the ceiling is removed. The strainer 8 disposed inside the filtration chamber Ra is lifted by using a crane or a chain block to remove foreign matters.

  However, foreign object removal work using heavy machinery such as an overhead crane or chain block has a problem that it involves many work processes and high work costs. There has been a demand for a double strainer type filter that can reduce the work process and reduce the work cost when removing foreign matters remaining on the strainer. The above can be said to be the subject of the present invention.

  The present invention has been made in view of such problems, and is a double strainer type filter that can maintain the other strainer when filtering foreign matter with one strainer. An object of the present invention is to provide a double strainer type filter that can easily remove residual foreign matters.

  The present inventor connects the drain pipe to the bottom of the strainer, makes it possible to collect foreign matter from the strainer, and makes it possible to backwash from the outer periphery of the strainer to the inside, thereby easily removing foreign matter remaining on the strainer. Based on this, the inventors have invented the following new double strainer type filter.

  (1) A double strainer type filter according to the present invention has a pair of filtration chambers having one end opened so that the fluid can be guided from the upstream side, the other end opened easily to flow the fluid downstream, and partitioned by a partition wall. In parallel, a strainer disposed inside the filtration chamber, for filtering the fluid from the upstream side and flowing out to the downstream side, and the inlets of the pair of filtration chambers are alternatively closed Alternatively, the upstream valve body movable between the inlets of the pair of filtration chambers and the outlets of the pair of filtration chambers can be alternatively closed or opened, and the outlets of the pair of filtration chambers A downstream valve body movable between the first valve feed mechanism, a first screw feed mechanism for moving the upstream valve body, a second screw feed mechanism for moving the downstream valve body, the upstream valve body, and the downstream A state in which the side valve body is moved synchronously, or the upstream side valve body and the lower side A switching mechanism disposed between the first screw feeding mechanism and the second screw feeding mechanism, and a one disposed at the bottom of the pair of filtration chambers so that the side valve bodies can be switched to a state in which the side valve bodies are moved independently of each other. A set of drainage pipes, and a gate valve that is disposed on the path of the drainage pipes and can be opened and closed in a state of discharging the fluid from the filtration chamber and a state of preventing draining of the fluid from the filtration chamber, In a state where the upstream valve body and the downstream valve body are moved independently from each other, the inlet of one of the filtration chambers is closed, the outlet of one of the filtration chambers is partially opened, and the other By allowing a fluid to flow into one of the filtration chambers from the outlet of the filtration chamber, the strainer disposed in one of the filtration chambers can be backwashed.

  (2) One of the filtration chambers that backwashes the strainer opens a gate valve of one of the drainage pipes, and the other filtration chamber that passes the strainer passes through the other drainage pipe. The gate valve is preferably closed.

  (3) It is preferable to arrange | position the collection tank which can collect | recover only the foreign material contained in the fluid discharged | emitted from the said drain pipe at the front-end | tip part of the said drain pipe.

  (4) The strainer has an opening on the top surface, a water introduction opening for guiding the fluid, a metal mesh that forms an outer periphery and collects foreign matters contained in the fluid, a perforated plate that forms a bottom surface, and a bottom portion of the perforated plate It is preferable that it has the saucer which is arrange | positioned below and opposes the center opening of the said perforated panel.

  In the double strainer type filter according to the present invention, in the state where the upstream valve body and the downstream valve body are moved independently from each other, the inlet of one filtration chamber is closed and the outlet of the one filtration chamber is partially closed. The strainer disposed in one filtration chamber can be back-washed by allowing the fluid to flow into one filtration chamber from the outlet of the other filtration chamber. Thereby, the foreign matter remaining on the strainer can be easily removed without lifting the strainer from the casing.

It is a top view which shows the structure of the double strainer type filter by one Embodiment of this invention, and has shown the principal part with the cross-sectional view. It is a left view which shows the structure of the double strainer type filter by the said embodiment, and has shown the principal part with the longitudinal cross-sectional view. It is a front view which shows the structure of the double strainer type filter by the said embodiment. It is a front view which shows the structure of the strainer with which the double strainer type filter by the said embodiment is equipped. It is AA arrow sectional drawing of FIG. It is a partial front view which shows the structure of the double strainer type filter by the said embodiment, and the downstream valve body is the state figure which opened the outflow port of one filtration chamber, and closed the outflow port of the other filtration chamber. It is a partial front view which shows the structure of the double strainer type filter by the said embodiment, and the downstream valve body partially opened the outflow port of one filtration chamber, and the state which opened the outflow port of the other filtration chamber substantially FIG. It is the front view which expanded the switching mechanism with which the double strainer type filter by the above-mentioned embodiment was expanded, and is the state figure which canceled the connection of one connecting rod and the other connecting rod. It is the front view which expanded the switching mechanism with which the double strainer type filter by the embodiment was equipped, and is the state figure which connected one connecting rod and the other connecting rod. It is a top view which shows the structure of the double strainer type filter by a prior art, and has shown the principal part with the cross-sectional view. It is a left view which shows the structure of the double strainer type filter by a prior art, and has shown the principal part with the longitudinal cross-sectional view. It is a front view which shows the structure of the double strainer type filter by a prior art.

Hereinafter, embodiments for carrying out the present invention will be described with reference to the drawings.
[Configuration of double strainer type filter]
First, the configuration of a double strainer type filter according to an embodiment of the present invention will be described. In addition, since the effect | action of the component which has the code | symbol same as the code | symbol attached | subjected by the prior art makes the same action, description may be abbreviate | omitted below.

  1 to 3, a double strainer type filter (hereinafter simply referred to as a filter) 10 according to an embodiment of the present invention includes a casing 1 and a pair of truncated cylindrical strainers 2 and 2. Yes. The casing 1 includes a casing main body 11, an upstream bonnet 12, and a downstream bonnet 13. The casing 1 includes a pair of disk-shaped top covers 14a and 14b and a pair of cylindrical bottom covers 15a and 15b.

(Structure of casing)
Referring to FIG. 1 or FIG. 2, the casing body 11 has a pair of filtration chambers Ra and Rb partitioned by a partition wall Bh formed in a parallel state. And strainers 2 and 2 are installed in these filtration chambers Ra and Rb.

  Referring to FIG. 1 or FIG. 2, the upstream bonnet 12 is attached to one end surface of the casing body 11. The upstream bonnet 12 opens the inside so as to easily conduct a fluid such as seawater flowing from the upstream Su side. The upstream bonnet 12 circulates the fluid guided from the upstream Su side to the filtration chamber Ra or the filtration chamber Rb.

  Referring to FIGS. 1 to 3, the downstream bonnet 13 is attached to the other end surface of the casing body 11. The downstream bonnet 13 opens the inside so that a fluid such as seawater flowing from the filtration chamber Ra or the filtration chamber Rb can easily flow out. And the downstream bonnet 13 can flow out to the downstream Sd side in a state where the fluid flowing from the filtration chamber Ra or the filtration chamber Rb collects foreign matter.

  As described above, referring to FIGS. 1 to 3, the casing 1 has one end opened so that the fluid can be guided from the upstream side, and the other end opened easily to allow the fluid to flow downstream. The casing 1 has a pair of filtration chambers Ra and Rb partitioned by a partition wall Bh in a parallel state.

  Referring to FIGS. 1 to 3, the pair of top covers 14 a and 14 b are detachably fixed to the upper surface of the casing body 11. One top cover 14a seals the upper opening of the filtration chamber Ra. When one top cover 14a is removed from the casing body 11, the strainer 2 installed in the filtration chamber Ra can be taken out. And the foreign material remaining on the strainer 2 can be removed.

  However, referring to FIG. 1 or FIG. 2, the strainer 2 installed in the filtration chamber Ra can remove foreign matters remaining on the strainer 2 by backwashing, as will be described later, so that one top cover 14a is removed. Many are unnecessary.

  1 to 3, the other top cover 14b seals the opening at the top of the filtration chamber Rb. When the other top cover 14b is removed from the casing body 11, the strainer 2 installed in the filtration chamber Rb can be taken out. And the foreign material remaining on the strainer 2 can be removed.

  However, referring to FIG. 1 or FIG. 2, the strainer 2 installed in the filtration chamber Rb can remove foreign matter remaining on the strainer 2 by backwashing, as will be described later, so that the other top cover 14b can be removed. Many are unnecessary.

  Referring to FIG. 2 or FIG. 3, the pair of bottom covers 15 a and 15 b are fixed to the bottom surface of the casing body 11. The pair of bottom covers 15a and 15b constitute part of the filtration chambers Ra and Rb. The pair of bottom covers 15a and 15b has a bottom plate 152 attached to the bottom. The bottom plate 152 has a hole communicating with the discharge port 15v at the center.

(Composition of discharge tank)
Referring to FIG. 2 or FIG. 3, a pair of drain pipes 18 and 18 are arranged at the bottom of the pair of filtration chambers Ra and Rb. The base end portion of the drain pipe 18 is fixed to the bottom plate 152. In the course of the drain pipe 18, a gate valve 18 v that can open and close the flow path of the drain pipe 18 is arranged.

  Referring to FIG. 2 or FIG. 3, when one gate valve 18v is opened, foreign matter such as shellfish and algae staying at the bottom of the filtration chamber Ra can be discharged together with the fluid. When one of the gate valves 18v is closed, the fluid can be prevented from being discharged from the filtration chamber Ra. When the other gate valve 18v is opened, foreign substances such as shellfish and algae staying at the bottom of the filtration chamber Rb can be discharged together with the fluid. When the other gate valve 18v is closed, the fluid can be prevented from being discharged from the filtration chamber Rb.

  Referring to FIG. 2 or FIG. 3, a recovery rod 19 is disposed at the tip of the drain pipe 18. The recovery rod 19 can recover foreign matter contained in the fluid discharged from the drain pipe 18.

(Configuration of upstream valve body and downstream valve body)
Referring to FIG. 1 or FIG. 2, the filter 10 further includes an upstream valve body 3 and a downstream valve body 4. The upstream valve body 3 is disposed between the upstream bonnet 12 and one end face of the casing body 11. The upstream valve body 3 is disposed so as to be capable of reciprocating between the filtration chamber Ra and the filtration chamber Rb by the first screw feed mechanism 1Ms.

  Referring to FIG. 1 or FIG. 2, the downstream valve body 4 is disposed between the downstream bonnet 13 and the other end surface of the casing body 11. The downstream valve body 4 is disposed so as to be capable of reciprocating between the filtration chamber Ra and the filtration chamber Rb by the second screw feed mechanism 2Ms.

(Configuration of first screw feed mechanism and second screw feed mechanism)
Referring to FIGS. 1 to 13, the filter 10 includes a first screw feed mechanism 1Ms and a second screw feed mechanism 2Ms. The first screw feed mechanism 1Ms can reciprocate the upstream valve body 3 between the filtration chamber Ra and the filtration chamber Rb. The second screw feed mechanism 2Ms can reciprocate the downstream valve body 4 between the filtration chamber Ra and the filtration chamber Rb.

  Referring to FIG. 1 or FIG. 2, the first screw feed mechanism 1Ms includes a feed screw Sf, a gear box Bg, and a handle Hd. Both ends of the feed screw Sf are rotatably held by the upstream bonnet 12. Further, the feed screw Sf is screwed with a female screw portion 41 protruding to the back side of the upstream valve body 3. When the feed screw Sf is rotated, the upstream valve body 3 can be moved along the feed screw Sf.

  1 to 3, the second screw feed mechanism 2Ms includes a feed screw Sf, a gear box Bg, and a handle Hd. Both ends of the feed screw Sf are rotatably held by the downstream bonnet 13. Further, the feed screw Sf is screwed with a female screw portion 41 protruding to the back side of the downstream valve body 4. When the feed screw Sf is rotated, the downstream valve body 4 can be moved along the feed screw Sf.

(Configuration of switching mechanism)
Next, the configuration of the switching mechanism 5 according to the embodiment will be described. Referring to FIG. 1, the filter 10 further includes a switching mechanism 5. The switching mechanism 5 is disposed between the gear box Bg of the first screw feed mechanism 1Ms and the gear box Bg of the second screw feed mechanism 2Ms.

  Referring to FIG. 1 or FIG. 8 and FIG. 9, the switching mechanism 5 includes a first connecting rod 51, a second connecting rod 52, and a butterfly bolt 5b. One end of the first connecting rod 51 is connected to the central axis of one handle Hd. When one handle Hd is rotated, the rotation can be transmitted to the first connecting rod 51.

  Referring to FIG. 1, FIG. 8, and FIG. 9, the second connecting rod 52 has the other end connected to the central axis of the other handle Hd. When the other handle Hd is rotated, the rotation can be transmitted to the second connecting rod 52.

  Referring to FIG. 1 or FIG. 8 and FIG. 9, the first connecting rod 51 has a large-diameter joint 51j at the other end. The joint 51j opens a hole 51h into which one end of the second connecting rod 52 can be introduced and fitted.

  With reference to FIG. 1 or FIG. 8, in the state which fitted the end part of the 2nd connecting rod 52 to the joint part 51j, and has arrange | positioned the 1st connecting rod 51 and the 2nd connecting rod 52 on the same axis | shaft, 51j and the one end part of the 2nd connecting rod 52 are mutually connected so that free rotation. Thereby, one handle Hd and the other handle Hd can be rotated independently of each other. That is, the upstream valve body 3 and the downstream valve body 4 can move independently of each other.

  Referring to FIG. 8 or FIG. 9, the joint portion 51j opens an insertion hole through which the screw portion 5ms of the butterfly bolt 5b can be inserted in the outer circumferential direction. The joint portion 51j is provided with a female screw portion that can be screwed with the screw portion 5ms of the butterfly bolt 5b coaxially with the insertion hole. On the other hand, at one end portion of the second connecting rod 52, an insertion hole through which the screw portion 5ms of the butterfly bolt 5b can be inserted is opened in the outer peripheral direction.

  Referring to FIG. 9, the threaded portion 5 ms of the butterfly bolt 5 b is fastened to the female threaded portion of the joint portion 51 j in a state where the insertion hole of the joint portion 51 j is aligned with the insertion hole of one end portion of the second connecting rod 52. Thus, the first connecting rod 51 and the second connecting rod 52 can be integrally rotated around their axes. That is, the upstream valve body 3 and the downstream valve body 4 can move in synchronization.

  As described above, referring to FIG. 1 or FIG. 8 and FIG. 9, the switching mechanism 5 is in a state of moving the upstream valve body 3 and the downstream valve body 4 synchronously, or the upstream valve body 3 and the downstream side. It is possible to switch to a state in which the valve bodies 4 are moved independently of each other.

(Strainer configuration)
Next, the configuration of the strainer 2 according to the embodiment will be described. Referring to FIG. 2 or FIG. 4 and FIG. 5, the strainer 2 has a water introduction opening 21 and a wire mesh 22. The water guide opening 21 opens to the upper surface of the strainer 2 and can guide the fluid. The metal mesh 22 forms the outer periphery of the strainer 2 and can collect foreign substances contained in the fluid.

  Referring to FIG. 2 or FIG. 4 and FIG. 5, the strainer 2 has a circular perforated plate 23 and a hat-shaped receiving tray 24. The perforated plate 23 has a plurality of holes through which foreign matter having a relatively large specific gravity can pass (see FIG. 5). The tray 24 is disposed below the bottom of the perforated plate 23. The tray 24 is opposed to the central opening 23 h of the perforated plate 23.

  Referring to FIG. 2 or FIG. 4, the strainer 2 is provided with a U-shaped spring handle 25 at the top. By installing the strainer 2 on the bottom cover 15a and fixing the top cover 14a to the casing body 11, the strainer 2 can be pressed against the bottom of the bottom cover 15a by the spring action of the spring handle 25. Similarly, by installing the strainer 2 on the bottom cover 15b and fixing the top cover 14b to the casing body 11, the strainer 2 can be pressed against the bottom of the bottom cover 15b by the spring action of the spring handle 25.

[Operation of double strainer type filter]
Next, the operation and effect of the double strainer type filter 10 according to the embodiment will be described.

  Referring to FIG. 1 or FIG. 2, when a fluid pressure passes through the filtration chamber Ra and a water pressure on the upstream Su side and a differential pressure on the downstream Sd side are generated, the strainer 2 disposed in the filtration chamber Ra is clogged. Since the foreign matter is generated and foreign matter is generated at the bottom of the strainer 2, the upstream valve body 3 and the downstream valve body 4 are moved to the filtration chamber Ra side, and the foreign matter is filtered on the filtration chamber Rb side. Then, while the foreign matter is being filtered on the filtration chamber Rb side, the foreign matter remaining on the strainer 2 disposed inside the filtration chamber Ra is removed.

  Referring to FIG. 2, in order to remove foreign matter remaining on the strainer 2 disposed inside the filtration chamber Ra, the upstream valve body 3 and the downstream valve body 4 are moved independently of each other. (See FIG. 1 or FIG. 2), the connection of the first connecting rod 51 and the second connecting rod 52 is released (see FIG. 8).

  Next, referring to FIG. 1 or FIG. 2, one handle Hd is rotated to close the inflow port 1Ka of one filtration chamber Ra. Further, the other handle Hd is rotated to partially open the outlet 2Ka of one filtration chamber Ra (see FIG. 1 or FIG. 7).

  In the state shown in FIG. 1 or FIG. 7, a part of the fluid flowing out from the outlet 2Kb of the other filtration chamber Rb to the downstream Sd side flows into one filtration chamber Ra (see FIG. 1). The strainer 2 disposed in the filtration chamber Ra can be backwashed. Thereby, the foreign material adhering to the outer periphery of the strainer 2 arrange | positioned at one filtration chamber Ra can be removed.

  1 to 9, the filter 10 according to the embodiment closes the inlet 1Ka of one filtration chamber Ra in a state where the upstream valve body 3 and the downstream valve body 4 are moved independently of each other. The strainer disposed in one filtration chamber Ra is formed by partially opening the outlet 2Ka of one filtration chamber Ra and allowing the fluid to flow into one filtration chamber Ra from the outlet 2Kb of the other filtration chamber Rb. 2 can be backwashed. Thereby, the foreign matter remaining on the strainer 2 can be easily removed without lifting the strainer 2 from the casing 1.

  Referring to FIG. 2 or FIG. 3, one filtration chamber Ra that backwashes the strainer 2 opens the gate valve 18v of one drain pipe 18 and the other filtration chamber Rb that allows the strainer 2 to pass through. The gate valve 18v of the other drain pipe 18 is preferably closed. Thereby, the fluid containing a foreign substance can be discharged | emitted from one filtration chamber Ra which backwashes the strainer 2. FIG.

  Referring to FIG. 2 or FIG. 3, the filter 10 according to the embodiment has a recovery rod 19 disposed at the tip of the drain pipe 18, so that only foreign matter contained in the fluid discharged from the drain pipe 18 is removed. Can be recovered.

The double strainer type filter according to the present invention can be expected to have the following effects.
(1) The strainer cleaning cost can be reduced.
(2) The number of strainer cleaning work orders can be reduced.
(3) The strainer cleaning operation can be performed by an internal operator, and the strainer cleaning operation can be performed without being restricted by time.

DESCRIPTION OF SYMBOLS 1 Casing 1Ka Inlet of filtration chamber Ra 1Kb Inlet of filtration chamber Rb 1Ms 1st screw feed mechanism 2.2 Pair of strainers 2Ka Outlet of filtration chamber Ra 2Kb Outlet of filtration chamber Rb 2Ms 2nd screw feed mechanism 3 Upstream Side valve body 4 Downstream valve body 5 Switching mechanism 10 Filter (double strainer type filter)
18.18 A set of drain pipes 18v Gate valve Bh Bulkhead Ra / Rb Filtration chamber Sd Downstream Su Upstream

Claims (4)

One end is opened to allow water to be introduced from the upstream side, the other end is opened easily to allow the fluid to flow downstream, and a pair of filtration chambers partitioned by a partition are formed inside in a parallel state; and
A strainer that is disposed inside the filtration chamber and filters the fluid from the upstream side to flow downstream;
An upstream valve body that can selectively close or open the inlets of the pair of filtration chambers and is movable between the inlets of the pair of filtration chambers;
A downstream valve body that can selectively close or open the outlets of the pair of filtration chambers and is movable between the outlets of the pair of filtration chambers;
A first screw feed mechanism for moving the upstream valve body;
A second screw feed mechanism for moving the downstream valve body;
The first screw feed can be switched to a state in which the upstream valve body and the downstream valve body are moved synchronously or a state in which the upstream valve body and the downstream valve body are moved independently of each other. A switching mechanism disposed between the mechanism and the second screw feed mechanism;
A set of drainage pipes arranged at the bottom of a pair of filtration chambers;
A gate valve that is arranged along the path of the drain pipe and can be opened and closed in a state of discharging fluid from the filtration chamber and a state of preventing discharge of fluid from the filtration chamber;
In a state where the upstream valve body and the downstream valve body are moved independently from each other, the inlet of one of the filtration chambers is closed, the outlet of one of the filtration chambers is partially opened, and the other A double strainer type filter capable of backwashing the strainer disposed in one of the filtration chambers by allowing a fluid to flow into one of the filtration chambers from an outlet of the filtration chamber. One of the filtration chambers that backwash the strainer opens a gate valve of the one drainage pipe,
The double strainer type filter according to claim 1, wherein the other filtration chamber through which the strainer passes is closing a gate valve of the other drain pipe.   The double strainer type filter according to claim 1 or 2, wherein a collection gutter capable of collecting only foreign matters contained in the fluid discharged from the drain pipe is disposed at a distal end portion of the drain pipe. The strainer
A water introduction opening that opens to the upper surface and conducts the fluid;
A wire mesh that forms an outer periphery and collects foreign matter contained in the fluid;
A perforated plate forming a bottom surface;
The double strainer type filter according to any one of claims 1 to 3, further comprising: a receiving tray disposed below a bottom portion of the porous plate and facing a central opening of the porous plate.

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