JP5840392B2 - Switching valve and pump system - Google Patents

Description

  The present invention relates to a switching valve that controls a fluid by moving a sliding body, and a pump system including the switching valve.

  2. Description of the Related Art Conventionally, there is a switching valve that is attached to a pipe through which a fluid flows and can stop a fluid or change a flow rate by moving a sliding body. Patent Document 1 describes a slide valve as a switching valve that can change the flow rate according to the amount of movement of a sliding body. Patent Document 2 describes a rotary valve as a switching valve that can change the flow rate according to the amount of movement (the amount of rotation) when the sliding body is rotated.

Japanese Utility Model Publication No. 61-55556 Japanese Utility Model Publication No. 64-25575

  However, the switching valve basically has only a function of permitting the blocking or passage of fluid. In addition, it is possible to adjust the flow rate by adjusting the moving amount of the sliding body as in Patent Documents 1 and 2, but it takes time to investigate the relationship between the moving amount and the flow rate, and the flow rate is arbitrarily set It was also difficult to control. Further, it has not been possible to perform fine control of the fluid flow, such as permitting flow in only one direction or permitting (filtering) only a part of the elements constituting the fluid.

  The present invention has been made paying attention to such problems existing in the prior art, and an object of the present invention is to provide a switching valve that can easily control the flow of fluid and a pump system including the switching valve. It is to provide.

In order to achieve the above object, the invention according to claim 1 is a switching valve arranged in an entire flow path through which a fluid flows, and a plurality of switching flow paths that constitute a part of the entire flow path are provided. comprising a slide movable relative to said overall flow path, wherein the sliding body, once moved, as the switching flow path constituting a part of the overall flow path, for switching provided in the sliding body the channel is configured to be switched to different switching flow path, wherein the sliding body each switching passage of, and the flow passage control member having different functions are provided, the overall flow path The fluid flowing into the volumetric pump is configured to be transferred by a volumetric pump, and one of the plurality of switching flow paths provided in the sliding body is a part of an inflow path through which the fluid flows into the volumetric pump. And a plurality of switching members provided on the sliding body One of the paths constitutes a part of a discharge path through which fluid is discharged from the positive displacement pump, and the sliding body, when moved, forms a part of the inflow path and the switching flow path The gist is to simultaneously switch the switching channels constituting a part of the discharge channel .

According to a second aspect of the present invention, in the switching valve disposed in the entire flow path through which the fluid flows, a plurality of switching flow paths that constitute a part of the entire flow path are provided and moved relative to the entire flow path A switching passage provided in the sliding body as a switching passage constituting a part of the entire passage when the sliding body is moved. In each switching flow path of the sliding body, a flow path control member having a different function is provided, and the fluid flowing in the entire flow path is One of a plurality of switching flow paths provided in the sliding body constitutes a part of an inflow path through which a fluid flows into the volumetric pump, and the sliding body One of the plurality of switching channels provided in the A filter that constitutes a part of a discharge path through which fluid is discharged from the pump and permits fluid having particles of a predetermined size or less to flow to either the inflow path or the discharge path is attached. In addition, a check valve that allows a fluid to flow into the positive displacement pump is attached to the switching flow path that constitutes a part of the inflow path as the flow path control member. A check valve that allows a fluid to be discharged from the volumetric pump is attached to the switching flow path that constitutes a part as the flow path control member, and when the sliding body is moved, The switching flow path that forms part of the inflow path and the switching flow path that forms part of the discharge path are simultaneously switched, and when switched, the switching flow path that forms part of the inflow path In A check valve that allows the fluid to be discharged from the displacement pump is attached as the flow path control member, while the switching flow path that constitutes a part of the discharge path has a fluid flowing to the volume pump. The gist is that a check valve that permits inflow is attached as the flow path control member.
Invention according to claim 3, in the invention of claim 1 or claim 2, wherein the sliding body, the entire flow switching channel other than switching channel which constitutes a part of the path and the switching the flow path control member provided in use flow path with are configured so as to be exposed to the outside of the overall flow path, the flow path control member which is exposed to the outside, that is replaceably configured The gist.

According to a fourth aspect of the present invention, in the invention according to any one of the first to third aspects, the flow path control member is a check that allows a fluid to flow only in a predetermined direction. The gist is that it is a valve.

The invention according to claim 5 is the gist of the invention according to claim 1 , wherein the flow path control member is a filter that allows a fluid having particles of a predetermined size or less to flow. To do.

A sixth aspect of the invention is characterized in that, in the invention of the first aspect, the flow path control member is a fixed orifice that allows a fluid having a flow rate equal to or lower than a predetermined flow rate to flow.

The invention according to claim 7, the overall flow path through which fluid flows, a switching valve for switching the switching flow path constituting a part of the overall flow path, a displacement pump for transporting the fluid flowing in the overall flow path the in either the entire flow path, the pump system comprising a filter, a to allow the flow of fluid having a predetermined size or less of the particles, the said switching valve, wherein the overall flow path one part switching flow path configuration provided with a plurality of, sliding body movable is provided to the overall flow path, one of the plurality of switching flow path provided on the sliding body, the volume with the fluid to the pump constitutes a part of the inflow path for flowing said one of the plurality of switching flow path provided on the sliding body is a part of the discharge passage in which the fluid is discharged from the displacement pump And a switching channel that forms part of the inflow channel While the check valve that allows fluid to flow into the displacement pump is mounted, said the switching flow path constituting a part of the discharge passage permits that the fluid is discharged from the displacement pump check valve is mounted, the sliding body, when being moved, the inflow passage part switching channel configuring and switching passage constituting a part of the discharge path other simultaneously each of with switching the switching flow path, when switched, the the switching flow path constituting a part of the inflow path, wherein the flow passage control member is a check valve that allows fluid to be discharged from the displacement pump while attached as the the switching flow path constituting a part of the discharge passage, the check valve that allows fluid to the displacement pump flows is attached as the flow passage control member The gist.

  According to the present invention, the flow of fluid can be easily finely controlled.

(A) is a block diagram of a pump system, (b) is a block diagram of a rotary valve, (c) is a block diagram of a rotary valve. The perspective view of a volumetric pump. AA sectional view taken on the line. BB sectional drawing. The exploded perspective view of a rotary valve. (A) is a top view of the positive displacement pump in a normal state, (b) is a cross-sectional view taken along line AA in a normal state, and (c) is a cross-sectional view taken along line BB in a normal state. (A) is a top view of the positive displacement pump during backwashing, (b) is a cross-sectional view taken along line AA during backwashing, and (c) is a cross-sectional view taken along line BB during backwashing. (A) is a top view of the positive displacement pump at the time of replacement, (b) is a sectional view taken along the line AA during replacement, and (c) is a sectional view taken along the line BB during replacement. The block diagram which shows an example of the conventional pump system. The block diagram which shows an example of the conventional pump system. The block diagram which shows an example of the conventional pump system. (A) And (b) is a block diagram of the rotary valve of another example. (A)-(c) is a block diagram of the rotary valve of another example. The disassembled perspective view of the rotary valve of another example.

Hereinafter, an embodiment in which the present invention is embodied in a rotary valve which is a kind of switching valve will be described with reference to FIGS.
A pump system 10 schematically illustrated in FIG. 1A includes a tubular inflow path 12 into which a fluid from a first pool 11 in which dirty liquid containing (a lot of) impurities is collected, and a flow path. And a tubular discharge passage 15 for discharging the clean liquid not containing impurities (to a small amount) to the external second pool 14. The pump system 10 is a closed circuit, and the fluid flowing in the pump system 10 (flow path) does not come into contact with the atmosphere. A suction filter 16 that permits a fluid having particles having a predetermined size or less to flow is attached in the middle of the inflow path 12. As a result, particles larger than a predetermined size included in the fluid flowing in from the first pool 11 are filtered until they flow through the inflow path 12 and reach the volume pump 13. That is, the dirty liquid is filtered to become a clean liquid.

Next, the volume pump 13 will be described in detail with reference to FIGS.
As shown in FIG. 2, the volumetric pump 13 is a bellows type volumetric pump 13 and includes a bellows-shaped bellows (expandable tube) 21 whose capacity changes. This bellows 21 is open only at one end. The bellows 21 is driven (expanded / contracted) by a driving force applied from a power source such as an induction motor 22 provided in the positive displacement pump 13. That is, when the driving force is applied, the capacity in the bellows 21 is changed, and the inflow (suction) and discharge of the fluid are performed. The induction motor 22 is provided with a speed reducer 23, and the driving force is adjusted by the speed reducer 23.

  A rotary valve 24 as a switching valve is attached to the inlet of the bellows 21. As shown in FIGS. 3 and 4, the rotary valve 24 includes a base 31 attached to the opening 21 a of the bellows 21, a sliding body 32 that is rotatably fixed to the base 31, and a sliding body 32 as a base. A connecting portion 33 that is fixed to 31 and connected to the inflow passage 12 and the discharge passage 15 is provided.

  As shown in FIGS. 3 and 4, the base portion 31 is formed in a bottomed cylindrical shape in which one side is opened in order to close the opening 21 a of the bellows 21. Then, the base 31 is configured so that the bottom 31a prevents the opening 21a of the bellows 21 (that is, the bottom 31a is the top in FIGS. 3 and 4 while the opening 31b is the bottom (the bellows 21 side). And fixed to the bellows 21. In addition, the internal diameter of the opening part 31b of the base 31 is formed larger than the outer diameter of the opening 21a of the bellows 21, as shown in FIG.

  In FIG. 3, two communication holes 34 a and 34 b are formed through the upper portion (bottom portion 31 a) of the base portion 31 so as to communicate with the opening 21 a of the bellows 21 when the base portion 31 is attached to the bellows 21. ing. That is, when the base 31 is attached to the bellows 21, two communication holes 34a and 34b communicating with the inside of the bellows 21 are formed. As shown in FIG. 5, a fixing shaft 35 for fixing the connecting portion 33 to the base portion 31 is erected on the bottom portion 31 a of the base portion 31 so as not to be aligned on the same line. A screw hole (female screw) 36 for screwing a screw (male screw) is provided in the upper part of the fixed shaft 35 along the vertical direction (extension / contraction direction of the bellows 21) in FIG. The fixed shaft 35 is provided on the opposite surface of the bellows 21.

  And the sliding body 32 formed in the column shape is rotatably fixed to one of the fixed shafts 35 of the base 31. More specifically, one of the fixed shafts 35 becomes a rotary shaft 35a to which the sliding body 32 is rotatably fixed, while the two fixed shafts excluding the fixed shaft 35 of the fixed shaft 35 that becomes the rotary shaft 35a. 35 b and 35 c are provided at positions where they do not interfere with the sliding body 32. That is, one of the fixed shafts 35 is also used as the rotating shaft 35 a of the sliding body 32. The rotation body 35a is inserted into an attachment hole 32a formed through the center of the sliding body 32 (the center of the circle) along the vertical direction, so that the sliding body 32 is rotatably fixed. Further, the distance from the rotation shaft 35 a to the other fixed shafts 35 b and 35 c is arranged to be larger than the radius of the sliding body 32. In other words, the radius of the sliding body 32 is formed to be smaller than the distance from the rotation shaft 35a to the other fixed shafts 35b and 35c. The rotating shaft 35a is provided at a substantially central portion of the base portion 31 with respect to the other fixed shafts 35b and 35c.

  The sliding body 32 is provided with a plurality of switching channels (four in this embodiment) 41a to 41d. The switching channels 41a to 41d are formed so as to penetrate along the same direction as the formation direction of the communication holes 34a and 34b formed in the base portion 31 (in the vertical direction in this embodiment). The distance from the switching flow paths 41a to 41d to the rotation shaft 35a and the distance from the communication holes 34a and 34b to the rotation shaft 35a are formed to coincide with each other.

  When the sliding body 32 is rotated to a predetermined position, as shown in FIG. 3, any one of the switching channels 41a to 41d coincides with the position of the communication holes 34a and 34b, and the communication holes 34a and 34b. The sliding body 32 is configured to communicate with the. That is, when the sliding body 32 is rotated to a predetermined position, the switching channels 41a to 41d can communicate with the inside of the bellows 21 through the communication holes 34a and 34b.

  More specifically, the communication holes 34a and 34b provided in the base 31 are formed so as to be symmetric about the rotation shaft 35a. In other words, a pair of communication holes 34a and 34b are provided so as to be positioned 180 degrees opposite to each other about the rotation shaft 35a. The distances from the rotation shaft 35a to the communication holes 34a and 34b are the same. On the other hand, the switching channels 41a to 41d are also formed to be symmetric with respect to the rotation shaft 35a (that is, the mounting hole 32a into which the rotation shaft 35a is inserted). That is, four switching channels 41a to 41d are provided at intervals of 90 degrees around the rotation shaft 35a. The distances from the rotation shaft 35a to the switching channels 41a to 41d are the same. For this reason, when the sliding body 32 is rotated to a predetermined position, two of the switching channels 41a to 41d coincide with the positions of the two communication holes 34a and 34b, respectively, and the communication holes 34a and 34b. And communicate with each other. More specifically, two communication channels 41 a and 41 c (or switching channels 41 b and 41 d) that are symmetric with respect to the rotation axis 35 a at 180 degrees are two communication channels provided in the base 31. The holes 34a and 34b are configured to communicate with each other.

  As described above, the distance between the communication holes 34a and 34b provided in the base 31 and the angle around the rotation shaft 35a, the distance between the paired switching channels 41a to 41d and the rotation shaft 35a as the center. The angle to be matched was made to match. The paired switching channels 41a to 41d are in communication with the switching channels 41a to 41d that coincide with (communicate with) the communication hole 34a when the sliding body 32 is disposed at a predetermined position. The switching channels 41a to 41d that coincide with (communicate with) the hole 34b. In the present embodiment, the switching channel 41a and the switching channel 41c, or the switching channel 41b and the switching channel 41d.

  Further, as shown in FIG. 5, on the outer surface of the sliding body 32, a handle (handle) for rotating the sliding body 32 around the rotation shaft 35a (that is, the mounting hole 32a into which the rotation shaft 35a is inserted). 42 is attached. By moving the handle 42, the sliding body 32 rotates while sliding with respect to the base portion 31. In the present embodiment, the fixed shafts 35b and 35c are provided so as not to interfere with the handle 42 so that the sliding body 32 can be rotated at least 180 degrees or more.

  The sliding body 32 has a flat surface in contact with the base 31 so as to be in close contact with the base 31. Further, the surface of the base portion 31 in contact with the sliding body 32 is similarly formed as a flat surface and surrounds the outer periphery of the communication holes 34 a and 34 b along the outer periphery of the communication holes 34 a and 34 b on the upper surface of the base portion 31. Further, an annular seal member 37 made of rubber is attached. For this reason, when the sliding body 32 is attached to the base 31, the sliding body 32 and the base 31 come into close contact with each other.

  As described above, the seal member 37 is attached along the outer peripheries of the communication holes 34a and 34b, and the sliding body 32 and the base 31 are configured to be in close contact with each other, so that the communication holes 34a and 34b are positioned at the positions. When the paired switching channels 41a to 41d are made to coincide with each other, fluid can be prevented from leaking from between the base portion 31 and the sliding body 32. That is, when the positions of the paired switching channels 41a to 41d are made to coincide with the positions of the communication holes 34a and 34b, the switching channels 41a to 41d paired with the communicating holes 34a and 34b can be communicated. it can. Thus, when the sliding body 32 is rotated to a predetermined position, the paired switching flow paths 41a to 41d can communicate with the inside of the bellows 21 through the communication holes 34a and 34b.

  A check valve (check valve) 44 is attached to each of the switching channels 41a to 41d as a duckbill-shaped channel control member having a hollow portion with an open end 43. The check valve 44 is composed of one part. In addition, the check valve 44 is configured such that two sides are formed on the side surface, and the two surfaces intersect at the tip (so that the tip is thin), and the tip is open. Yes. Therefore, when the check valve 44 receives pressure from the front end direction (when the pressure from the front end direction is stronger than the pressure from the rear end direction), the check valve 44 has a check performance due to the pressing force applied to the two surface portions. Has come to demonstrate.

  In other words, the fluid is allowed to pass only in a predetermined direction (direction toward the front end, forward direction). In other words, the check valve 44 allows fluid to flow freely under a differential pressure in the forward direction, while suppressing the inflow of fluid under a differential pressure in the reverse direction. Thereby, in the forward direction, the check valve 44 allows a fluid flow by opening a port provided at the tip. On the other hand, when flowing in the reverse direction, the check valve 44 is pressed in the horizontal direction in the lateral direction, the mouth is closed and sealed, and the flow of the fluid is suppressed.

  And in this embodiment, as shown in FIG.1 and FIG.5, it becomes the direction opposite to the direction of the check valve 44 attached to the switching flow paths 41a-41d located in the 180 degree opposite side centering on the rotating shaft 35a. As described above, the check valve 44 is attached to the switching channels 41a to 41d. That is, the check valve 44 in the forward direction and the check valve 44 in the reverse direction are attached to the pair of switching flow paths 41a to 41d as a pair. That is, when the switching channels 41a to 41d communicate with the communication holes 34a and 34b, they are attached so that one of them is in the forward direction and the other is in the reverse direction.

  In the present embodiment, the check valve 44 is mounted in the same direction as one of the adjacent check valves 44 in the circumferential direction around the rotation shaft 35a, and is mounted in a different direction from the other. Specifically, when the tip (forward direction) of the check valve 44 attached to the switching channel 41a is on the bellows 21 side (lower side), the counter valve 44 is counterclockwise about the rotation shaft 35a. A check valve 44 is attached to the adjacent switching channel 41b so as to be in the same direction as the direction of the check valve 44 attached to the switching channel 41a. That is, the forward direction of the check valve 44 attached to the switching channel 41b is on the bellows 21 side (lower side).

  The switching channel 41c located next to the switching channel 41b when it is counterclockwise about the rotating shaft 35a has a direction opposite to the direction of the check valve 44 attached to the switching channel 41b. A check valve 44 is attached so that That is, the forward direction of the check valve 44 attached to the switching channel 41c is on the opposite side (upper side) from the bellows 21.

  The switching channel 41d located next to the switching channel 41c when it is counterclockwise about the rotating shaft 35a has the same direction as the direction of the check valve 44 attached to the switching channel 41c. A check valve 44 is attached so that That is, the forward direction of the check valve 44 attached to the switching channel 41c is on the opposite side (upper side) from the bellows 21. In FIG. 1, the flow path connected to the inflow path 12 or the discharge path 15 is indicated by a solid line, while the flow path connected to the bellows 21 side is indicated by a broken line.

  The diameters of the switching flow paths 41 a and 41 b in which the tip (forward direction) of the check valve 44 is downward (base 31 side) are the diameters of the engaging protrusions 47 provided at the lower periphery of the check valve 44. It is formed smaller than. Then, on the upper surface of the sliding body 32, the engagement recesses 46 are provided on the outer periphery of the switching channels 41a and 41b, as shown in FIG. 4, and the check is inserted into the switching channels 41a and 41b. The engaging projection 47 of the valve 44 is engaged. Therefore, the check valve 44 inserted into the switching channels 41a and 41b can be attached and detached from above the sliding body 32.

  The diameters of the switching channels 41c and 41d in which the tips (forward direction) of the switching channels 41c and 41d are upward (on the connection portion 33 side) are the engagement convex portions provided on the periphery of the check valve 44. It is formed approximately the same as the diameter of 47 (more specifically, slightly larger). Thereby, the engagement convex part 47 of the check valve 44 is not engaged with the switching channels 41c and 41d, and the check valve 44 is inserted to the lower ends of the switching channels 41c and 41d. In addition, a fixing member 48 formed in a cylindrical shape is inserted into the switching channels 41c and 41d from above the check valve 44 inserted into the switching channels 41c and 41d. The outer diameter of the fixing member 48 is formed to be substantially the same as the inner diameter of the switching channels 41c and 41d, and is engaged with the lower end of the fixing member 48 and the engaging convex portion 47 of the check valve 44. Further, the inner diameter of the fixing member 48 is formed. That is, the check valve 44 is configured to be accommodated inside the fixing member 48 except for the engaging convex portion 47. Further, the heights (vertical heights) of the switching channels 41 c and 41 d are substantially the same as the combined value of the height of the fixing member 48 and the thickness of the engaging protrusion 47. Thereby, as shown in FIGS. 3 and 4, the fixing member 48 fixes the check valve 44 by sandwiching the engagement convex portion 47 of the check valve 44 with the base portion 31. Therefore, the check valve 44 inserted into the switching channels 41 c and 41 d can be attached and detached together with the fixing member 48 from above the sliding body 32. From the above, it is possible to attach and detach the check valve 44 from above the positive displacement pump 13 no matter what direction the check valve 44 is attached.

  And the connection part 33 is attached to the base 31 from the upper side (opposite the surface which contact | connects the base 31) where the sliding body 32 was rotatably fixed. The connection portion 33 is fixed to the base portion 31 so as to sandwich the sliding body 32 by screwing screws 49 into the screw holes 36 formed in the fixed shaft 35. Moreover, the lower surface (surface which contacts the sliding body 32) of the connection part 33 is formed in the plane. And on the upper surface (surface which contacts the connection part 33) of the sliding body 32, it forms cyclically | annularly with rubber | gum so that the outer periphery of switching flow path 41a-41d may be enclosed along the outer periphery of switching flow path 41a-41d. A sealing member 50 is installed. For this reason, when the connecting portion 33 is fixed to the base portion 31, the sliding body 32 and the connecting portion 33 are in close contact with each other and are sealed so that no fluid flows between the sliding body 32 and the connecting portion 33.

  The connecting portion 33 is formed with four through holes 51a to 51d penetrating in the vertical direction (that is, the same direction as the forming direction of the switching flow paths 41a to 41d). The through holes 51a to 51d are formed at equal intervals around the rotation shaft 35a (the insertion hole 55 into which the rotation shaft 35a is inserted). That is, the through holes 51a to 51d are formed at intervals of 90 degrees around the rotation shaft 35a. The through holes 51a to 51d are formed so that the distances from the rotation shaft 35a are equal. As described above, the through holes 51a to 51d are arranged so that their positions coincide (communicate) with all the switching channels 41a to 41d.

  And when the connection part 33 is fixed to the base part 31, as shown in FIG. 3, two through-holes 51a and 51c of the through-holes 51a to 51d are connected to the communication holes 34a and 34b formed in the base part 31. Are arranged to match each other. An inflow side connection pipe 52 for communicating with the inflow passage 12 is attached to the through hole 51a of the connection portion 33 whose position coincides with the communication hole 34a formed in the base portion 31. Further, a discharge side connection pipe 53 for communicating with the discharge path 15 is attached to the through hole 51 c of the connection portion 33 whose position coincides with the communication hole 34 b formed in the base portion 31.

  For this reason, when the flow paths 41a to 41d for switching are made to coincide with the positions of the through holes 51a to 51d provided in the connection portion 33, they are arranged at the positions of the through holes 51a to which the inflow side connection pipes 52 are attached. The switching channels 41 a to 41 d are part of the inflow channel 12. Thereby, the inflow path 12 communicates with the inside of the bellows 21 through the communication hole 34 a of the base 31. Further, the switching flow paths 41 a to 41 d arranged at the positions of the through holes 51 c to which the discharge side connection pipe 53 is attached become a part of the discharge path 15. As a result, the discharge path 15 communicates with the inside of the bellows 21 through the communication hole 34 b of the base 31.

  On the other hand, when the connection portion 33 is fixed to the base portion 31, a cap 54 for closing the through holes 51b and 51d is attached to the upper portions of the two through holes 51b and 51d among the through holes 51a to 51d. The cap 54 is configured to be removable from above. Therefore, when the switching flow paths 41a to 41d are made to coincide with the positions of the through holes 51a to 51d provided in the connection portion 33, the through hole 51b to which the inflow side connection pipe 52 and the discharge side connection pipe 53 are not attached. , 51d, the switching channels 41a to 41d are exposed to the outside by removing the cap 54. That is, the switching flow paths 41a to 41d are part of the inflow path 12 or the discharge path 15 when arranged at the positions of the through holes 51b and 51d to which the inflow side connection pipe 52 and the discharge side connection pipe 53 are not attached. It is comprised so that exposure to the exterior of a flow path and the volumetric pump 13 is not carried out.

  Next, the operation of the pump system 10 in the normal state will be described. In the normal state, as shown in FIGS. 1A and 6, the switching flow path 41 a to which the check valve 44 in which the forward direction is the inner side (lower side) of the bellows 21 is mounted is an inflow path. 12 (that is, communicating with the inflow side connecting pipe 52, the through hole 51a, and the communication hole 34a). Further, in the normal state, as shown in FIG. 6, the switching channel 41 c on which the check valve 44 whose forward direction is the opposite side (upper side) of the bellows 21 is mounted is a part of the discharge channel 15 ( That is, it is communicated with the discharge side connection pipe 53, the through hole 51c, and the communication hole 34b).

  When the induction motor 22 starts to be driven and the bellows 21 extends, the volume of the bellows 21 increases. At this time, a check valve 44 whose forward direction is the inner side of the bellows 21 is attached to the switching channel 41 a that is a part of the inflow channel 12, while it is a part of the discharge channel 15. A check valve 44 whose forward direction is outside the bellows 21 is attached to the switching channel 41c. For this reason, the rotary valve 24 restricts the inflow of the fluid from the second pool 14 while permitting the inflow of the fluid from the first pool 11. That is, the fluid from the first pool 11 flows into the bellows 21. In addition, when the fluid is allowed to flow from the first pool 11 into the bellows 21 via the inflow passage 12, impurities are filtered by the suction filter 16 to become a clean liquid.

  When the bellows 21 is contracted by the driving force of the induction motor 22, the volume of the bellows 21 is reduced. At this time, a check valve 44 whose forward direction is the inner side of the bellows 21 is attached to the switching channel 41 a that is a part of the inflow channel 12, while it is a part of the discharge channel 15. A check valve 44 whose forward direction is outside the bellows 21 is attached to the switching channel 41c. For this reason, the rotary valve 24 permits the discharge of the fluid to the second pool 14, while suppressing the discharge of the fluid to the first pool 11. That is, the fluid in the bellows 21 is discharged to the second pool 14. As a result, the dirty liquid in the first pool 11 is filtered, becomes a clean liquid, and is discharged into the second pool 14.

  By the way, when the dirty liquid is transferred by the volume pump 13 and filtered by the suction filter 16 in this way, impurities gradually accumulate in the filter. When impurities accumulate, the amount of flowing fluid passes or the inflow pressure of the volumetric pump 13 must be increased, and the efficiency of filtration deteriorates. For this reason, it is necessary to backwash the suction filter 16 periodically by reversing the flow of the fluid in the pump system 10.

Here, the backwashing method of the suction filter 16 will be described.
First, as shown in FIG. 1B and FIG. 7A, the slide body 32 is rotated 90 degrees counterclockwise from the normal state by using the handle 42 provided on the slide body 32. In addition, this state rotated 90 degree | times is hereafter shown as a backwashing state. Accordingly, as shown in FIGS. 7B and 7C, the switching channel 41 d to which the check valve 44 whose forward direction is the outside (upper side) of the bellows 21 is mounted is the inflow channel 12. (That is, communicating with the inflow side connecting pipe 52, the through hole 51a, and the communication hole 34a). Further, in the backwashing state, the switching flow path 41b to which the check valve 44 whose forward direction is the inner side (lower side) of the bellows 21 is attached is a part of the discharge path 15 (that is, the discharge side connection pipe 53). , Communicating with the through hole 51c and the communication hole 34b).

  In this backwashing state, when the induction motor 22 starts driving and the bellows 21 extends, the volume of the bellows 21 increases. At this time, a check valve 44 whose forward direction is outside the bellows 21 is attached to the switching flow path 41d that is a part of the inflow path 12, while it is a part of the discharge path 15. A check valve 44 whose forward direction is the inside of the bellows 21 is attached to the switching channel 41b. For this reason, the rotary valve 24 restricts the inflow of the fluid from the first pool 11 while permitting the inflow of the fluid from the second pool 14. That is, the fluid from the second pool 14 flows into the bellows 21. In the backwashing state, the second pool 14 contains a fluid (such as a cleaning liquid or a clean liquid) for backwashing the suction filter 16.

  When the bellows 21 is contracted by the driving force of the induction motor 22, the volume of the bellows 21 is reduced. At this time, a check valve 44 whose forward direction is outside the bellows 21 is attached to the switching flow path 41d that is a part of the inflow path 12, while it is a part of the discharge path 15. A check valve 44 whose forward direction is the inside of the bellows 21 is attached to the switching channel 41b. For this reason, the rotary valve 24 permits the discharge of the fluid to the first pool 11, while suppressing the discharge of the fluid to the second pool 14. That is, the fluid in the bellows 21 passes through the inflow path 12 and is discharged to the first pool 11. At this time, the fluid flows backward from the positive displacement pump 13 side to the first pool 11 side. At this time, impurities accumulated in the suction filter 16 are also washed away by the passage of the fluid and cleaned.

  As described above, the direction of the check valve 44 can be changed by rotating the sliding body 32 without replacing the check valve 44. Therefore, the direction of the check valve 44 can be easily changed by the rotary valve 24 without stopping the pump system 10 and disassembling, and the labor of backwashing can be reduced.

  In addition, as described above, when the dirty liquid is transferred by the volumetric pump 13 and filtered by the suction filter 16, even if the impurities are filtered by the suction filter 16, it is removed by the suction filter 16 if used for a long time. Dirt that cannot be removed accumulates in the check valve 44 that suppresses the flow of fluid. If the check valve 44 is contaminated, the amount of fluid flowing will increase, or the inflow pressure of the positive displacement pump 13 will have to be increased, which may reduce the efficiency of filtration. Therefore, it is necessary to replace the check valve 44 periodically.

Next, a method for replacing the check valve 44 will be described.
First, as shown in FIG. 1C and FIG. 8A, the slide body 32 is rotated 90 degrees clockwise from the normal state by using the handle 42 provided on the slide body 32. This state rotated 90 degrees is hereinafter referred to as an exchange state. As a result, as shown in FIGS. 8B and 8C, the switching flow path 41b in which the check valve 44 whose forward direction is the inner side (lower side) of the bellows 21 is mounted is an inflow path. 12 (that is, communicating with the inflow side connecting pipe 52, the through hole 51a, and the communication hole 34a). Further, in the exchange state, the switching flow path 41d, to which the check valve 44 whose forward direction is the outer side (upper side) of the bellows 21 is mounted, is a part of the discharge path 15 (that is, the discharge side connection pipe 53, the through Hole 51c and communication hole 34b).

  In this exchange state, the direction of the check valve 44 is the same as in the normal state. For this reason, as in the normal state, the dirty liquid in the first pool 11 is filtered to become a clean liquid and discharged to the second pool 14.

  On the other hand, in the exchange state, as shown in FIG. 8C, the switching channel 41 a communicates with the through hole 51 b of the connection portion 33. In this state, when the cap 54 is removed, the check valve 44 attached to the switching channel 41a is exposed to the outside. For this reason, the operator can remove the check valve 44 from above and then attach the cleaned check valve 44.

  Similarly, in the exchange state, as shown in FIG. 8C, the switching channel 41 c communicates with the through hole 51 c of the connection portion 33. In this state, when the cap 54 is removed, the check valve 44 attached to the switching channel 41c is exposed to the outside. For this reason, the operator can remove the check valve 44 from above and then attach the cleaned check valve 44.

  Then, after the check valve 44 is replaced, the normal state can be restored by rotating the sliding body 32. As described above, in the exchange state, the check valve 44 can be exchanged while filtering the fluid. For this reason, since the check valve 44 is replaced, the fluid filtering operation is not interrupted, and the efficiency of the operation can be improved.

As described above in detail, the present embodiment has the following effects.
(1) In the rotary valve 24, a sliding body provided with a plurality of switching channels 41a to 41d is rotatably provided. Then, by using the handle 42 to rotate and move the sliding body 32, the switching channels 41 a to 41 d can be arbitrarily changed to a part of the inflow path 12 or the discharge path 15. Since the switching valves 41a to 41d are each equipped with a check valve 44, the direction of the check valve 44 (direction allowing fluid flow) can be easily achieved by rotating the sliding body 32. Can be switched. Therefore, by using the rotary valve 24 to switch the switching channels 41a to 41d, the check valve 44 accommodated in the switching channels 41a to 41d can be easily switched, and the fluid can be easily Can be controlled. That is, the flow direction of the fluid can be easily changed.

  (2) The check valve 44 attached to the switching passages 41a to 41d communicating with the through holes 51b and 51d that do not constitute part of the inflow passage 12 or the discharge passage 15 is removed by removing the cap 54. Can be exposed to. The check valve 44 can be replaced by switching so as to be exposed to the outside. Moreover, when exchanging, the forward direction of the check valve 44 (direction in which fluid flow is permitted) can be set to different directions (or the same direction). When the sliding body 32 is moved and the switching channels 41a to 41d are exposed by being positioned (communicated) in the through holes 51b and 51d, the other switching channels 41a to 41d are connected to the inflow channel 12. And a part of the discharge path 15. For this reason, the fluid flow (system) is not stopped during maintenance such as replacement, cleaning, and inspection of the check valve, so that productivity can be improved. Further, it is not necessary to disassemble the pump system 10, and the check valve 44 can be easily removed, so that the maintenance work time can be shortened.

  (3) The pair of switching channels 41a to 41d provided on the sliding body 32 can be made to coincide with the communication holes 34a and 34b. Then, the switching flow paths 41a to 41d that are paired with the communication holes 34a and 34b constitute part of the inflow path 12 or the discharge path 15, respectively. As a result, the switching channels 41 a to 41 d that become a part of the inflow path 12 and the switching channels 41 a to 41 d that become a part of the discharge path 15 can be switched simultaneously by simply moving the sliding body 32. For this reason, the trouble at the time of switching can be saved rather than the case of switching one by one. Further, the switching channels 41 a to 41 d that are part of the inflow channel 12 and the switching channels 41 a to 41 d that are part of the discharge channel 15 can be switched simultaneously. For this reason, the check valve 44 installed in the switching channels 41 a to 41 d constituting a part of the inflow passage 12 and the check installed in the switching channels 41 a to 41 d constituting a part of the discharge passage 15. The forward direction of the valve 44 can be changed simultaneously. Thereby, the suction filter 16 can be back-washed almost without stopping the volume pump 13. Further, the check valve 44 installed in the switching flow paths 41 a to 41 d constituting a part of the inflow path 12 and the switching for constituting a part of the discharge path 15 without changing the forward direction of the check valve 44. The check valve 44 installed in the flow paths 41a to 41d can be changed at the same time. Thereby, the check valve 44 can be exposed and exchanged with the volume pump 13 almost stopped. Therefore, work can be performed efficiently.

  (4) By the way, conventionally, a pump system 100 as shown in FIG. 9 has been known. More specifically, the pump system 100 as shown in FIG. 9 includes a tubular inflow passage 102 through which fluid from the first pool 101 in which dirty liquid containing (a lot of) impurities is collected flows in a normal state. . The pump system 100 also includes a volumetric pump 103 that transfers the fluid in the flow path, and a tubular discharge path 105 that discharges clean liquid not containing impurities (less) to the external second pool 104. Yes. A suction filter 106 that allows a fluid having particles having a predetermined size or less to flow is attached in the middle of the inflow path 102. As a result, particles larger than a predetermined size contained in the fluid flowing in from the first pool 101 are filtered until they flow through the inflow path 102 and reach the volumetric pump 103. In addition, a check valve 107 that permits passage of fluid from the outside to the inside of the volume pump 103 is attached to the inlet (inlet on the dirty liquid side) of the volume pump 103. Similarly, a check valve 108 that permits passage of fluid from the inside of the volume pump 103 to the outside is attached to the outlet of the volume pump 103 (outlet on the clean liquid side). For this reason, when the suction filter 106 is back-washed with the conventional pump system 100, it takes time and effort to stop the pump system 100 and to change the directions of the check valve 107 and the check valve 108. In addition, when the check valve 107 and the check valve 108 are replaced, it is necessary to stop the pump system 100, which is troublesome. Therefore, by adopting the pump system 10 as in this embodiment, the check valve 44 can be easily replaced, and the suction filter 106 can be easily backwashed.

  (5) Conventionally, a pump system 200 as shown in FIG. 10 has been known. More specifically, a pump system 200 as shown in FIG. 10 includes a tubular inflow path 202 into which a fluid from the first pool 201 in which dirty liquid containing (a lot of) impurities is collected and a flow path in a normal state. The volumetric pump 203 for transferring the fluid is provided. In addition, the pump system 200 includes a tubular discharge path 205 for discharging clean liquid that does not contain impurities (small amount) to the external second pool 204. A suction filter 206 that permits fluid having particles having a predetermined size or less to flow is attached in the middle of the inflow path 202. As a result, particles larger than a predetermined size included in the fluid flowing in from the first pool 201 are filtered until they flow through the inflow path 202 and reach the volumetric pump 203. Further, a check valve 207 that permits passage of fluid from the outside to the inside of the volume pump 203 is attached to the inlet of the volume pump 203 (inlet on the dirty liquid side). Similarly, a check valve 208 that permits passage of fluid from the inside of the volume pump 203 to the outside is attached to the outlet of the volume pump 203 (outlet on the clean liquid side).

  The pump system 200 is provided with a reverse cleaning pipe and a switching valve. More specifically, an inflow path side switching valve 209 is provided in the middle of the inflow path 202. One switching destination of the inflow path side switching valve 209 is connected to a pipe connected to the inlet of the volumetric pump 203, while the other switching destination is connected to a pipe connected to the outlet of the volumetric pump 203. ing. The inflow path side switching valve 209 can switch the piping so as to connect the inflow path 202 to either the inlet or the outlet of the volumetric pump 203. A discharge path side switching valve 210 is provided in the middle of the discharge path 205. One switching destination of the discharge path side switching valve 210 is connected to a pipe connected to the inlet of the volumetric pump 203, while the other switching destination is connected to a pipe connected to the outlet of the volumetric pump 203. ing. The discharge path side switching valve 210 can switch the piping so that the discharge path 205 is connected to either the inlet or the outlet of the volumetric pump 203. During normal use (when dirty liquid is filtered), the inflow path side switching valve 209 is switched to connect the inflow path 202 to the inlet of the volumetric pump 203, and the discharge path side switching valve 210 is discharged. The path 205 is switched to connect with the outlet of the volumetric pump 203.

  When the suction filter 206 is back-washed with such a pump system 200, the inflow path side switching valve 209 and the discharge path side switching valve 210 may be switched without stopping the pump system 200, respectively. That is, the inflow path side switching valve 209 is switched to connect the inflow path 202 to the outlet of the volumetric pump 203, and the discharge path side switching valve 210 is switched to connect the discharge path 205 to the inlet of the volumetric pump 203. However, such a pump system 200 has a problem that the number of pipes and switching valves increases. Furthermore, in such a pump system 200, when the check valve 207 and the check valve 208 are replaced, it is necessary to stop the pump system 200, which is troublesome. Therefore, by adopting the pump system 10 as in this embodiment, the check valve can be easily replaced. In addition, the number of pipes and switching valves for performing the back cleaning can be reduced. Therefore, the pump system 10 can be reduced in size and the cost can be reduced.

  (6) Conventionally, a pump system 300 as shown in FIG. 11 has been known. More specifically, a pump system 300 as shown in FIG. 11 includes a tubular inflow path 302 into which a fluid from the first pool 301 into which dirty liquid containing (many) impurities is collected and a flow path in a normal state. The displacement pump 303 for transferring the fluid is provided. Further, the pump system 300 includes a tubular discharge path 305 for discharging clean liquid that does not contain impurities (small amount) to the external second pool 304. In the middle of the inflow path 302, a suction filter that allows a fluid having particles of a predetermined size or less to flow is attached. As a result, particles larger than a predetermined size included in the fluid flowing in from the first pool 301 are filtered until they flow through the inflow path 302 and reach the volumetric pump 303. In addition, a check valve 307 that permits passage of fluid from the outside to the inside of the volume pump 303 is attached to the inlet of the volume pump 303 (inlet on the dirty liquid side). Similarly, a check valve 308 that permits passage of fluid from the inside of the volume pump 303 to the outside is attached to the outlet of the volume pump 303 (outlet on the clean liquid side).

  The pump system 300 is provided with an air generator for backwashing, piping, and a switching valve. More specifically, a reverse cleaning switching valve 309 is provided in the middle of the inflow path 302. One switching destination of the reverse cleaning switching valve 309 is connected to a pipe connected to the inlet of the positive displacement pump 303, while the other switching destination is connected to a pipe connected to the air generator 310. ing. In addition, a stop switching valve 311 is provided in the middle of the inflow path 302 to cut off the connection between the volume pump 303 and the suction filter during backwashing. When the suction filter is backwashed with such a pump system 300, the backwashing switching valve 309 and the stop switching valve 311 may be switched. That is, the reverse cleaning switching valve 309 is switched so as to connect the inflow path 302 to the air generator 310.

  Further, the pump system 300 is provided with a reserve volume pump 312, a pipe and a switching valve that are used when the check valves 307 and 308 are replaced. More specifically, an inflow passage side switching valve 313 is provided in the middle of the inflow passage 302. One switching destination of the inflow passage side switching valve 313 is connected to a pipe connected to the inlet of the volumetric pump 303, while the other switching destination is a pipe connected to the inlet of the spare volumetric pump 312. It is connected. The inflow path side switching valve 313 can switch the piping so as to connect the inflow path 302 to either the inlet of the volumetric pump 303 or the inlet of the spare volumetric pump 312. Further, a discharge path side switching valve 314 is provided in the middle of the discharge path 305. One switching destination of the discharge path side switching valve 314 is connected to a pipe connected to the outlet of the volumetric pump 303, while the other switching destination is a pipe connected to the outlet of the spare volumetric pump 312. It is connected. The discharge path side switching valve 314 can switch the pipe so that the discharge path 305 is connected to either the outlet of the volumetric pump 303 or the outlet of the auxiliary volumetric pump 312. During normal use (when dirty liquid is filtered), the inflow path side switching valve 313 is switched to connect the inflow path 302 to the inlet of the volumetric pump 303, and the discharge path side switching valve 314 is discharged. The path 305 is switched to connect to the outlet of the volumetric pump 203.

  When the check valve 307 and the check valve 308 are exchanged in such a pump system 300, the inflow path side switching valve 313 and the discharge path side switching valve 314 are respectively switched and connected to the reserve volume pump 312. That is, at the time of replacement, the inflow path side switching valve 313 is switched so as to connect the inflow path 302 to the inlet of the reserve volume pump 312, and the discharge path side switching valve 314 is connected to the outlet of the reserve volume pump 312. It has been switched to connect. Thereby, the positive displacement pump 303 is not used, and the check valve 307 and the check valve 308 can be replaced or cleaned without stopping the pump system.

  However, such a pump system 300 has a problem that the volumetric pump, the piping, and the switching valve in the system increase during backwashing and replacement of the check valves 307 and 308, resulting in a complicated system. . Therefore, by adopting the pump system 10 as in this embodiment, the check valve can be easily replaced. In addition, it is possible to reduce the number of piping and switching valves for performing backwashing and check valve replacement. Therefore, the pump system 10 can be reduced in size and the cost can be reduced.

(Second embodiment)
Next, a second embodiment embodying the present invention will be described. In addition, the same code | symbol as 1st embodiment is attached | subjected to the structure similar to 1st embodiment, the detailed description and drawing are abbreviate | omitted or simplified.

In the present embodiment, the communication holes 34a and 34b provided in the base 31 are provided at positions 120 degrees (or 240 degrees) apart from the rotation shaft 35a.
The sliding body 32 of the present embodiment is provided with three switching channels 141a to 141c. When the sliding body 32 is rotated to a predetermined position, any one of the switching channels 141a to 141c matches the position of the communication holes 34a and 34b, and the sliding body communicates with the communication holes 34a and 34b. 32 is configured. That is, when the sliding body 32 is rotated to a predetermined position, the switching channels 141a to 141c can communicate with the inside of the bellows 21 through the communication holes 34a and 34b.

  More specifically, the switching channels 141a to 141c are formed at an equal angle with the rotation shaft 35a (that is, the mounting hole 32a into which the rotation shaft 35a is inserted) as the center. That is, three switching channels 141a to 141c are provided at intervals of 120 degrees around the rotation shaft 35a. For this reason, when the sliding body 32 is rotated to a predetermined position, two of the switching channels 141a to 141c coincide with the positions of the two communication holes 34a and 34b, respectively, and the communication holes 34a and 34b. And communicate with each other.

  As described above, the distance between the communication holes 34a and 34b provided in the base 31 and the angle around the rotation shaft 35a, the distance between the paired switching channels 141a to 141c, and the rotation shaft 35a. The angle to be matched was made to match. In this embodiment, the switching channels 141a to 141c to be paired are switching channels 141a that coincide with (communicate with) the communication holes 34a when the sliding body 32 is arranged at a predetermined position. To 141c and switching channels 141a to 141c that coincide with (communicate with) the communication hole 34b. In the present embodiment, the switching channel 141a and the switching channel 141b, the switching channel 141b and the switching channel 141c, or the switching channel 141a and the switching channel 141c are used.

  In this embodiment, as shown in FIG. 12, a check valve 44 whose forward direction is the inner side (lower side) of the bellows 21 is attached to the two switching channels 141a to 141c. A check valve 44 whose forward direction is the outside (upper side) of the bellows 21 is attached to the flow paths 141a to 141c. Specifically, a check valve 44 whose forward direction is the inner side (lower side) of the bellows 21 is attached to the switching channel 141a. A check valve 44 whose forward direction is the inner side (lower side) of the bellows 21 is attached to the switching channel 141b. A check valve 44 whose forward direction is the outside (upper side) of the bellows 21 is attached to the switching channel 141c.

  In addition, although not shown, the connection portion 33 is formed with three through holes formed at equal intervals around the rotation shaft 35a so as to correspond to the switching channels 141a to 141c. That is, the three through holes are formed at intervals of 120 degrees around the rotation shaft 35a. In the present embodiment, when the connecting portion 33 is fixed to the base portion 31, a cap 54 for closing the through hole is formed only on the upper portion of one through hole that does not constitute a part of the inflow passage 12 or the discharge passage 15. It is attached.

  Next, the operation of the pump system 10 in the normal state will be described. In the normal state, as shown in FIG. 12A, the switching channel 141 a to which the check valve 44 whose forward direction is the inner side (lower side) of the bellows 21 is attached is one of the inflow channels 12. Has become a department. Further, in the normal state, as shown in FIG. 12A, the switching flow path 141 c to which the check valve 44 whose forward direction is the outside (upper side) of the bellows 21 is mounted is a part of the discharge path 15. It has become.

  When the induction motor 22 starts to be driven and the bellows 21 extends, the volume of the bellows 21 increases. At this time, the rotary valve 24 restricts the inflow of fluid from the second pool 14 while permitting the inflow of fluid from the first pool 11. That is, the fluid from the first pool 11 flows into the bellows 21.

  When the bellows 21 is contracted by the driving force of the induction motor 22, the volume of the bellows 21 is reduced. At this time, the rotary valve 24 permits the fluid to be discharged to the second pool 14, while suppressing the discharge of the fluid to the first pool 11. That is, the fluid in the bellows 21 is discharged to the second pool 14. As a result, the dirty liquid in the first pool 11 is filtered, becomes a clean liquid, and is discharged into the second pool 14.

Next, a back washing method for the suction filter 16 will be described.
First, as shown in FIG. 12B, the slide body 32 is rotated 120 degrees counterclockwise from the normal state by using the handle 42 provided on the slide body 32. Hereinafter, this state rotated by 120 degrees is referred to as a backwash state. As a result, the switching flow path 141c to which the check valve 44 whose forward direction is the outside (upper side) of the bellows 21 is mounted is a part of the inflow path 12. Further, in the backwashing state, the switching channel 141 b in which the check valve 44 whose forward direction is the inner side (lower side) of the bellows 21 is mounted is a part of the discharge channel 15.

  In this backwashing state, when the induction motor 22 starts driving and the bellows 21 extends, the volume of the bellows 21 increases. At this time, the rotary valve 24 restricts the inflow of fluid from the first pool 11, while permitting the inflow of fluid from the second pool 14. That is, the fluid from the second pool 14 flows into the bellows 21.

  When the bellows 21 is contracted by the driving force of the induction motor 22, the volume of the bellows 21 is reduced. At this time, the rotary valve 24 permits the discharge of the fluid to the first pool 11, while suppressing the discharge of the fluid to the second pool 14. That is, the fluid in the bellows 21 passes through the inflow path 12 and is discharged to the first pool 11. At this time, the fluid flows backward from the positive displacement pump 13 side to the first pool 11 side. At this time, impurities accumulated in the suction filter 16 are also washed away by the passage of the fluid and cleaned.

  As described above, the direction of the check valve 44 can be changed by rotating the sliding body 32 without replacing the check valve 44. Therefore, the direction of the check valve 44 can be easily changed by the rotary valve 24 without stopping the pump system 10 and disassembling, and the labor of backwashing can be reduced.

As described above in detail, this embodiment has the following effects in addition to the effects of the first embodiment.
(7) The sliding body 32 is provided with three switching channels 141a to 141c. For this reason, compared with the case where four switching channels are provided, the thickness (diameter size) of the pipes of the switching channels 141a to 141c can be increased, and the amount of flowing fluid is increased. be able to.

  (8) The check valve 44 attached to the switching flow path 141a that is a part of the inflow path 12 is the same as the check valve 44 that is mounted to the switching flow path 141c that is a part of the discharge path 15. In comparison, it is easier to get dirty. Therefore, in the backwashing state, the check valve 44 mounted on the switching channel 141a is exposed to the outside so that it can be replaced. As a result, the suction filter 16 can be backwashed, and the check valve 44 mounted on the switching channel 141a can be replaced, thereby improving work efficiency.

(Third embodiment)
Next, a third embodiment embodying the present invention will be described. In addition, the same code | symbol as 1st embodiment is attached | subjected to the structure similar to 1st embodiment, the detailed description and drawing are abbreviate | omitted or simplified.

  In the present embodiment, the communication holes 34a and 34b provided in the base 31 are provided at positions 120 degrees (or 240 degrees) apart from the rotation shaft 35a. In addition, the sliding body 32 of the present embodiment is provided with three switching channels 141a to 141c. About these arrangement | positioning, since it is the same as that of 2nd embodiment, detailed description is abbreviate | omitted.

  And in this embodiment, as shown to Fig.13 (a), the check valve 44 from which the forward direction becomes the inner side (downside) of the bellows 21 is attached to one switching flow path 141a-141c. A check valve 44 whose forward direction is the outside (upper side) of the bellows 21 is attached to the two switching channels 141a to 141c. Specifically, a check valve 44 whose forward direction is the inner side (lower side) of the bellows 21 is attached to the switching channel 141a. A check valve 44 whose forward direction is the outside (upper side) of the bellows 21 is attached to the switching channel 141b. A check valve 44 whose forward direction is the outside (upper side) of the bellows 21 is attached to the switching channel 141c.

  In addition, although not shown, the connection portion 33 is formed with three through holes formed at equal intervals around the rotation shaft 35a so as to correspond to the switching channels 141a to 141c. That is, the three through holes are formed at intervals of 120 degrees around the rotation shaft 35a. In the present embodiment, when the connecting portion 33 is fixed to the base portion 31, a cap 54 for closing the through hole is formed only on the upper portion of one through hole that does not constitute a part of the inflow passage 12 or the discharge passage 15. It is attached.

  Next, the operation of the pump system 10 in the normal state will be described. In the normal state, as shown in FIG. 13A, the switching channel 141 a to which the check valve 44 whose forward direction is the inner side (lower side) of the bellows 21 is attached is one of the inflow channels 12. Has become a department. Further, in the normal state, as shown in FIG. 13A, the switching flow path 141 c on which the check valve 44 whose forward direction is the outer side (upper side) of the bellows 21 is mounted is a part of the discharge path 15. It has become.

  When the induction motor 22 starts to be driven and the bellows 21 extends, the volume of the bellows 21 increases. At this time, the rotary valve 24 restricts the inflow of fluid from the second pool 14 while permitting the inflow of fluid from the first pool 11. That is, the fluid from the first pool 11 flows into the bellows 21.

  When the bellows 21 is contracted by the driving force of the induction motor 22, the volume of the bellows 21 is reduced. At this time, the rotary valve 24 permits the fluid to be discharged to the second pool 14, while suppressing the discharge of the fluid to the first pool 11. That is, the fluid in the bellows 21 is discharged to the second pool 14. As a result, the dirty liquid in the first pool 11 is filtered, becomes a clean liquid, and is discharged into the second pool 14.

Next, a back washing method for the suction filter 16 will be described.
First, as shown in FIG. 13B, the slide body 32 is rotated 120 degrees clockwise from the normal state using the handle 42 provided on the slide body 32. Hereinafter, this state rotated by 120 degrees is referred to as a backwash state. Thereby, the switching flow path 141b in which the check valve 44 whose forward direction is the outer side (upper side) of the bellows 21 is mounted is a part of the inflow path 12. Further, in the backwashing state, a switching flow path 141 a in which a check valve 44 whose forward direction is the inner side (lower side) of the bellows 21 is mounted is a part of the discharge path 15.

  In this backwashing state, when the induction motor 22 starts driving and the bellows 21 extends, the volume of the bellows 21 increases. At this time, the rotary valve 24 restricts the inflow of fluid from the first pool 11, while permitting the inflow of fluid from the second pool 14. That is, the fluid from the second pool 14 flows into the bellows 21.

  When the bellows 21 is contracted by the driving force of the induction motor 22, the volume of the bellows 21 is reduced. At this time, the rotary valve 24 permits the discharge of the fluid to the first pool 11, while suppressing the discharge of the fluid to the second pool 14. That is, the fluid in the bellows 21 passes through the inflow path 12 and is discharged to the first pool 11. At this time, the fluid flows backward from the positive displacement pump 13 side to the first pool 11 side. At this time, impurities accumulated in the suction filter 16 are also washed away by the passage of the fluid and cleaned.

By the way, when exchanging the bellows 21, it is necessary to prevent the fluid from flowing out from the inflow path 12 and the discharge path 15.
In this case, the handle 42 provided on the sliding body 32 is used to rotate the sliding body 32 counterclockwise 120 degrees from the normal state as shown in FIG. It is possible to prevent fluid from flowing out of the passage 15. Hereinafter, this state rotated 120 degrees counterclockwise is referred to as a stopped state. As a result, the switching flow path 141c to which the check valve 44 whose forward direction is the outside (upper side) of the bellows 21 is mounted is a part of the inflow path 12. Further, in the backwashing state, the switching channel 141 b in which the check valve 44 whose forward direction is the outside (upper side) of the bellows 21 is mounted is a part of the discharge channel 15. Thereby, it can suppress that the liquid from the inflow path 12 or the discharge path 15 flows out by the check valve 44, respectively.

As described above in detail, this embodiment has the following effects in addition to the effects of the first embodiment and the effect (8) of the second embodiment.
(9) The check valve 44 attached to the switching flow path 141a that is a part of the inflow path 12 is the same as the check valve 44 mounted to the switching flow path 141c that is a part of the discharge path 15. In comparison, it is easier to get dirty. Therefore, in the stop state, the check valve 44 mounted on the switching channel 141a is exposed to the outside so that it can be replaced. As a result, the bellows 21 can be replaced, and the check valve 44 mounted on the switching channel 141a can be replaced, thereby improving work efficiency.

In addition, you may change the said embodiment as follows.
In the above-described embodiment, the rotary valve 24 in which the sliding body 32 rotates is provided, but a slide valve that moves the sliding body in the lateral direction may be employed.

  In the above embodiment, the switching channels 41a to 41d and 141a to 141c constituting part of the inflow channel 12 and the discharge channel 15 are switched at the same time, but may be switched one by one. That is, an independent rotary valve may be provided in the inflow passage 12 and an independent rotary valve may be provided in the discharge passage 15.

  -In the said embodiment, you may provide switching valves, such as a rotary valve or a slide valve which can switch a filter in the middle of the inflow path 12 or the discharge path 15. FIG. In this case, a filter as a flow path control member is detachably provided in the switching flow path. Thereby, by moving the sliding body 32, a filter can be replaced | exchanged and it can wash | clean easily. Further, by changing the type of the filter and exchanging it, the size of the particles that are allowed to pass through can be easily changed.

  In the above embodiment, a switching valve such as a rotary valve or a slide valve is provided in the middle of the inflow path 12 or the discharge path 15 that can switch a fixed orifice that allows a fluid having a predetermined flow rate or less to flow. Also good. In this case, a fixed orifice as a flow path control member is detachably provided in the switching flow path. Thereby, the flow rate can be easily changed. Further, since the fixed orifice is configured to be detachable, it can be easily replaced and the flow rate of the fluid can be changed.

In the above embodiment, the rotary valve may be provided in a flow path other than the pump system 10.
In the above embodiment, the check valve 44, the filter, and the fixed orifice need not be detachably provided.

-In the said embodiment, you may change the flow path for switching to arbitrary numbers. For example, six switching channels may be provided.
In the above embodiment, the bellows type volumetric pump 13 is used, but a diaphragm type volumetric pump or the like may be used.

In the above embodiment, the check valve 44 may be not only a duck bill type but also a ball type or a poppet type.
In the above embodiment, the sliding body 32 has been manually switched, but may be switched by an electric motor or solenoid, or air pressure or hydraulic pressure.

  -In above-mentioned embodiment, although the sealing members 37 and 50 were formed in cyclic | annular form with rubber | gum, as long as it can seal, a material and a shape may be changed arbitrarily. The attachment position may be arbitrarily changed. For example, the sealing members 37 and 50 may have a shape as shown in FIG. 14 and may be provided with recesses in which the sealing members 37 and 50 are attached to the sliding body 32. Further, the pitch of the flow paths may be arbitrarily changed.

  DESCRIPTION OF SYMBOLS 10 ... Pump system, 11 ... 1st pool, 12 ... Inflow path, 13 ... Volume pump, 14 ... 2nd pool, 15 ... Discharge path, 16 ... Suction filter, 21 ... Bellows, 22 ... Induction motor, 23 ... Reduction gear 24 ... Rotary valve 31 ... Base part 32 ... Sliding body 33 ... Connection part 34a, 34b ... Communication hole 35 ... Fixed shaft 35a ... Rotating shaft 36 ... Screw hole 37 ... Seal member 41a-41d , 141a to 141c ... switching channel, 42 ... grip, 44 ... check valve, 46 ... engagement recess, 47 ... engagement projection, 48 ... fixing member, 49 ... screws 51a-51d ... through hole, 52 ... inflow Side connection pipe, 53 ... discharge side connection pipe, 54 ... cap, 55 ... insertion hole.

Claims (7)

In the switching valve arranged in the entire flow path through which the fluid flows,
The entire flow switching passage constituting a part of the path is provided with a plurality, comprising a sliding body movable relative to said overall flow path,
The sliding body, once moved, the as switching channel constituting a part of the overall flow path, switching flow path provided on the sliding body is configured to be switched to different switching channel And
In each switching channel of the sliding body, a channel control member having a different function is provided ,
The fluid flowing through the entire flow path is configured to be transferred by a volumetric pump,
One of the plurality of switching channels provided in the sliding body constitutes a part of an inflow path through which fluid flows into the volumetric pump, and the plurality of switching channels provided in the sliding body. One of which constitutes part of a discharge path through which fluid is discharged from the positive displacement pump;
When the sliding body is moved , the switching valve is configured to simultaneously switch a switching flow path forming a part of the inflow path and a switching flow path forming a part of the discharge path . In the switching valve arranged in the entire flow path through which the fluid flows,
The entire flow switching passage constituting a part of the path is provided with a plurality, comprising a sliding body movable relative to said overall flow path,
The sliding body, once moved, the as switching channel constituting a part of the overall flow path, switching flow path provided on the sliding body is configured to be switched to different switching channel And
In each switching channel of the sliding body, a channel control member having a different function is provided ,
The fluid flowing through the entire flow path is configured to be transferred by a volumetric pump,
One of the plurality of switching channels provided in the sliding body constitutes a part of an inflow path through which fluid flows into the volumetric pump, and the plurality of switching channels provided in the sliding body. One of which constitutes part of a discharge path through which fluid is discharged from the positive displacement pump;
A filter that allows a fluid having particles having a predetermined size or less to flow is attached to either the inflow path or the discharge path,
A check valve that allows a fluid to flow into the positive displacement pump is attached to the switching flow path that constitutes a part of the inflow path as the flow path control member, while a part of the discharge path is A check valve that allows the fluid to be discharged from the volume pump is attached to the switching flow path that is configured as the flow path control member,
When the sliding body is moved, the sliding body simultaneously switches the switching flow path that forms a part of the inflow path and the switching flow path that forms a part of the discharge path. A check valve that allows a fluid to be discharged from the volumetric pump is attached as a flow path control member to the switching flow path that forms a part of the path, while a part of the discharge path is configured A switching valve , characterized in that a check valve that allows a fluid to flow into the positive displacement pump is attached to the switching flow path as the flow path control member . The sliding body is to expose the flow path control member provided to the switching flow path and the switching flow path other than the switching flow path constituting a part of the overall flow path to the outside of the overall flow path together are configured, the flow path control member which is exposed to the outside, the switching valve according to claim 1 or claim 2, characterized in that it is replaceably configured. The switching valve according to any one of claims 1 to 3, wherein the flow path control member is a check valve that allows a fluid to flow only in a predetermined direction. The switching valve according to claim 1, wherein the flow path control member is a filter that allows a fluid having particles having a predetermined size or less to flow. The switching valve according to claim 1, wherein the flow path control member is a fixed orifice that allows a fluid having a flow rate equal to or lower than a predetermined flow rate to flow. An overall flow path through which the fluid flows;
A switching valve that switches a switching channel that forms part of the entire channel;
A displacement pump for transporting the fluid flowing in the overall flow path,
In a pump system comprising: a filter that allows a fluid having particles of a predetermined size or less to flow in any of the entire flow paths;
The said switching valve, the switching passage constituting a part of the overall flow path is provided with a plurality, sliding body movable is provided to the overall flow path,
Wherein one of the plurality of switching flow path provided on the sliding body, together with the fluid to the displacement pump constitutes a part of the inflow passage flows, a plurality of switching channels provided in the sliding body one of the form part of the discharge passage in which the fluid is discharged from the displacement pump,
Wherein the switching passage constituting a part of the inflow path, the one check valve which fluid into the volume pump is allowed to flow into is mounted, the switching passage constituting a part of the discharge path in is check valve which fluid allowed to be discharged is mounted from the displacement pump,
The sliding body has when it is moved, together with the switches the switching flow path which constitutes a part of a switching passage and the discharge passage which constitutes a part of the inflow channel to another switching passages each simultaneously, when switched, the the switching flow path constituting a part of the inlet channel, while check valve that allows fluid to be discharged from the displacement pump is attached as the flow passage control member, the the switching flow path constituting a part of a discharge path, the pump system, wherein a check valve that allows fluid to flow into the displacement pump is attached as the flow passage control member.

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