JP2019044708A - Fluid valve device - Google Patents

Abstract

To provide a fluid valve device capable of improving maintainability of a fluid tank.SOLUTION: A fluid valve device includes a casing 10 which is provided in an oil tank 100 for storing working fluid and has a strainer arrangement space S1 in an inside thereof, and a strainer 50 which is detachably attached to the strainer arrangement space S1. When the strainer 50 is attached to the casing 10, a magnet holding tool 80 presses a check valve 40 to an open position against energizing force of a coil spring 43 so that a drain hole 34 is opened. When the strainer 50 is detached from the casing 10, the magnet holding tool 80 is separated from the check valve 40 and the coil spring 43 energizes the check valve 40 to a close position so that the drain hole 34 is closed.SELECTED DRAWING: Figure 6

Description

  The present invention relates to a fluid valve device attached to a fluid tank which stores fluid.

  2. Description of the Related Art Conventionally, a fluid tank for storing a fluid such as water, hydraulic oil, or fuel is provided with a filter device for filtering the fluid, and is widely used in various industrial fields. The filter device is configured to include a filter element as a detachable member that is detachably mounted in the fluid tank (see, for example, Patent Document 1). In the above-mentioned patent document 1, a filter element which is detachably attached in the oil tank from an opening formed on the side surface under the oil tank (fluid tank) liquid surface storing the hydraulic oil (fluid) and filters the hydraulic oil is provided. Have been described.

JP, 2006-35985, A

  Since the filter element may cause problems such as clogging due to long-term use, it is necessary to periodically perform maintenance such as inspection and replacement. However, in the filter device of the above configuration, when the filter element is removed in a state where the hydraulic oil is stored in the oil tank, a problem occurs that the hydraulic oil in the oil tank leaks from the opening to the outside. Therefore, in the related art, since it was necessary to remove the filter element after temporarily removing the hydraulic oil stored in the oil tank, there has been a problem that the maintainability is lowered.

  The present invention has been made in view of such problems, and an object of the present invention is to provide a fluid valve device capable of improving the maintainability of a fluid tank.

In order to solve the above-mentioned subject, a fluid valve device concerning the present invention is provided in a fluid tank (for example, oil tank 100 in an embodiment) which stores fluid, and accommodation space (for example, a strainer in an embodiment) is arranged inside A fluid valve device comprising: a casing member (for example, a casing 10 in the embodiment) having a space S1); and a detachable member (for example, a strainer 50 in the embodiment) detachably attached to the accommodation space The casing member is provided in the casing main body in which the opening (for example, drain hole 34 in the embodiment) for communicating the inside of the accommodation space and the inside of the fluid tank is formed, and the casing main body is provided with the opening An open / close valve movable between an open position for opening and a closed position for closing the opening (for example, an embodiment A check valve 40) and biasing means (for example, a coil spring 43 in the embodiment) provided on the casing main body to bias the on-off valve to the closed position; An operation unit (for example, the screen 72 in the embodiment) which performs a predetermined operation by being inserted and in contact with a fluid, and an operation unit (for example, an operation unit provided on one end side of the detachable member and capable of contacting the on-off valve) Magnet holder 80) in the embodiment, and when the detachable member is attached to the casing member, the operating portion presses the on-off valve to the open position against the biasing force of the biasing means. The opening portion is opened, and the operating portion is separated from the on-off valve when the detachable member is removed from the casing member. By biasing the on-off valve to the closed position, wherein the opening is configured to be closed.

  In the above-described invention, the detachable member is a filter element (for example, the strainer 50 in the embodiment) having a filter medium (for example, the screen 72 in the embodiment) for filtering a fluid as the action portion. The detachable member is disposed in the accommodation space, and divides the accommodation space into a pre-filtration space (for example, inflow space S2 in the embodiment) and a post-filtration space (for example, outflow space S3 in the embodiment). It is preferable that the fluid can be filtered by passing the fluid from the pre-filtering space to the post-filtering space through a filter medium.

  Further, in the above-mentioned invention, the casing member has an attachment / detachment hole (for example, strainer attachment / detachment hole 22 in the embodiment) for communicating the housing space with the outside, and the attachment / detachment member passes the attachment / detachment hole A connecting portion which can be inserted into the housing space and in which the detachable member is formed with an outer peripheral surface which is screwed or fitted to the inner peripheral surface of the detachable hole when the detachable member is attached to the casing member For example, a seal member for sealing between the inner peripheral surface and the outer peripheral surface between the inner peripheral surface of the attaching / detaching hole and the outer peripheral surface of the connection portion. (For example, an O-ring 66 in the embodiment is provided, and a fluid discharge groove (for example, a discharge groove 59 in the embodiment) extending along the mounting / removing direction of the mounting / demounting member is formed on the outer peripheral surface of the connection portion. The When the detachable member is removed from the casing member, the fluid remaining in the accommodation space can be discharged to the outside through the fluid discharge groove after the sealing state by the seal member is released. It is preferable to be configured.

  According to the fluid valve device of the present invention, when the detachable member is attached to the casing member, the operating portion presses the on / off valve against the biasing force of the biasing means to the open position, thereby opening the casing main body. Is opened, and when the detachable member is removed from the casing member, the opening of the casing main body is closed by the operating portion being separated from the on-off valve and the biasing means biasing the on-off valve to the closed position. By configuring, it is possible to prevent the fluid stored in the fluid tank from leaking to the outside at the time of replacement / inspection of the detachable member such as the filter element and the detection sensor, so that the maintainability of the fluid tank is improved. Is possible.

  Further, in the above invention, when the detachable member is removed from the casing member, the fluid remaining in the storage space can be discharged to the outside through the fluid discharge groove after the sealing state by the seal member is released. With this configuration, the fluid does not scatter on the floor surface or the like when the detachable member is removed, and the fluid can be easily discharged.

It is a sectional view showing a drain filter device concerning this embodiment. It is sectional drawing which shows the casing of the said drain filter apparatus. It is a half sectional view showing the strainer of the above-mentioned drain filter device. It is sectional drawing which shows the state which has inserted the said strainer in the said casing. It is sectional drawing which shows the state which the external thread part of the said strainer is screwing together with the internal thread part of the said casing. It is a sectional view showing the state where the above-mentioned strainer was attached to the above-mentioned casing. It is sectional drawing which shows the said casing after the said strainer is removed. It is sectional drawing which shows the modification of the said drain filter apparatus.

Hereinafter, preferred embodiments of the present invention will be described with reference to the drawings. The drain filter device 1 to which the fluid valve device according to the present invention is applied is shown in FIG. 1 to FIG. 3, and the entire configuration of the drain filter device 1 will be described first with reference to these drawings. In the following, for convenience of explanation, referring to the arrangement posture of the drain filter device 1 shown in FIG. 1, the vertical and horizontal arrow directions shown in the drawing will be referred to as vertical and horizontal directions.

  The drain filter device 1 is a filter device disposed in the oil tank 100 for filtering hydraulic oil (drain oil discharged from a hydraulic pump) returned from the outside. The oil tank 100 is installed in a working machine (not shown) and stores hydraulic oil supplied to various hydraulic devices provided in a predetermined hydraulic circuit. The oil tank 100 is formed in a box shape, and can store a predetermined amount of hydraulic oil therein. In the oil tank 100, although not shown, in addition to the above-mentioned drain filter device, a suction filter device for filtering hydraulic oil drawn into the hydraulic pump, and hydraulic actuators (hydraulic cylinders (hydraulic cylinders, hydraulic motors) Various filter devices such as a return filter device for filtering hydraulic oil (return oil) which is pumped back to the

  The drain filter device 1 mainly includes a casing 10 horizontally installed on the side wall 101 of the oil tank 100 and having a strainer disposition space S1 therein, and a strainer (oil strainer) 50 detachably attached to the casing 10. Configured

  The casing 10 includes a flange 20 fixed to the side wall 101 of the oil tank 100 and a casing main body 30 integrally joined to the flange 20 and horizontally disposed in the oil tank 100.

  The flange 20 is provided with a fixed cylindrical portion 21 formed in a hollow cylindrical shape, and an annular collar portion 28 protruding to the outer peripheral side of the fixed cylindrical portion 21. The flange 20 is attached to a tank hole penetrated by the side wall 101 of the oil tank 100. At the center of the fixed cylindrical portion 21, a strainer attaching / detaching hole 22 which can penetrate the strainer 50 through in the left-right direction is provided. The strainer attaching / detaching hole 22 constitutes a part of the strainer disposition space S1. A female screw portion 23 is formed on the inner peripheral surface of the fixed cylindrical portion 21 coaxially with the strainer mounting hole 22. An external thread 26 is formed on the outer peripheral surface of the fixed cylindrical portion 21 to be screwed with the female screw 25 of the lock nut 24. The fixed cylindrical portion 21 is inserted into the tank hole of the oil tank 100 and the flange 28 is formed. With the side wall 101 of the oil tank 100 sandwiched between the screw and the lock nut 24, the female screw portion 25 of the lock nut 24 is screwed to the male screw portion 26 of the fixed cylindrical portion 21. The flange 20 (casing 10) is fixed to 101. At the right end of the fixed cylindrical portion 21, a step 27 to which the left end of the casing main body 30 is joined is formed.

  The casing main body 30 is formed in a hollow cylindrical shape and has a pipe member 31 whose left and right ends are open, and a disk shape joined to the right end of the pipe member 31 to close the right open end of the pipe member 31 End plate 32 of FIG. The pipe member 31 is a hollow cylindrical pipe formed of, for example, a synthetic resin material or a metal material. The pipe member 31 is formed in a size capable of accommodating the strainer 50 (the protector 71 and the screen 72) described later. The axial center of the end plate 32 is formed with an axial hole 33 penetrating to the front and back. Further, in the end plate 32, a plurality of drain holes 34 which are penetrated to the front and back around the shaft hole 33 are formed at equal intervals in the circumferential direction. The drain hole 34 serves as a flow port for hydraulic oil that connects the inside of the strainer disposition space S1 and the inside of the oil tank 100. A check valve 40 for opening and closing the drain hole 34 is attached to the end plate 32. The right side surface of the end plate 32 is formed as a seating surface 35 on which the check valve 40 can be abutted (seatable).

The check valve 40 includes a shaft 41 slidably inserted into the shaft hole 33 of the end plate 32, and a valve body 42 fixed to the right end of the shaft 41 for opening and closing the plurality of drain holes 34 of the end plate 32. It is configured with. The check valve 40 is biased leftward by the elastic force of a coil spring 43 supported across the end plate 32 and the shaft 41.

  The shaft 41 is inserted into the axial hole 33 of the end plate 32 and slidably mounted in the axial direction (left and right direction). The shaft 41 is formed using a hexagonal bolt. The valve body 42 is formed in a disk shape having a size that can close the plurality of drain holes 34 by abutting on the seat surface 35 of the end plate 32. A screw hole passing through the front and back is formed at the center of the valve body 42, and the screw portion of the shaft 41 is screwed into the screw hole of the valve body 42, whereby the valve body 42 and the shaft 41 are integrated. Be done. One end of the coil spring 43 is supported by a nut 44 screwed to the shaft 41, and the other end is supported by the left end surface of the end plate 32, and interposed between the two in a compressed state. Thus, the check valve 40 is always biased in the left direction (valve closing direction). In the check valve 40 having such a configuration, the valve body 42 is in contact with the seating surface 35 of the end plate 32 to close the plurality of drain holes 34 and the valve body 42 is separated from the seating surface 35 of the end plate 32 It is movable between an open position where the plurality of drain holes 34 are opened.

  The strainer 50 is a filter element configured to include a head 60 connected to the drain pipe 110 and a strainer main body 70 integrally joined to the head 60. The strainer 50 is attached to the strainer disposition space S1 of the casing 10 in the left-right direction (horizontal direction).

  The head 60 is formed in a hollow cylindrical shape using a metal material such as an aluminum alloy, and the drain pipe 110 connected to the drain circuit of the above-described hydraulic pump can be connected. In the axial center of the head 60, an inflow hole 61 through which the hydraulic oil (drain oil) discharged from the drain pipe 110 passes is formed to pass through right and left. On the outer peripheral surface of the head 60, in order from left to right, a nut portion 62 with which a fastening tool is engaged, a disk-like washer portion 63 that abuts on the left end of the flange 20, and an internal thread of the flange 20 An external thread portion 64 screwed with the portion 23 and a tip end cylindrical portion 65 to which the left end of the strainer main body 70 is joined are formed. Between the washer portion 63 and the male screw portion 64, a first annular groove 67 in which an O-ring 66 as a sealing member is mounted is recessed. When the strainer 50 is attached to the casing 10, the O-ring 66 is in close contact with the outer peripheral surface of the head 60 and the inner peripheral surface of the flange 20, and seals between the two in a fluid-tight manner. Further, in the middle of the distal end cylindrical portion 65, a second annular groove 69 in which an O-ring 68 as a sealing member is mounted is recessed. The O-ring 68 is in close contact with the outer peripheral surface of the head 60 and the inner peripheral surface of the strainer main body 70 to seal the outer peripheral surface of the head 60 and the inner peripheral surface of the strainer main body 70 in a liquid tight manner.

  The strainer main body 70 includes a cylindrical protector 71, a cylindrical screen 72 disposed on the inner circumferential surface side of the protector 71, and an end plate 73 for holding the protector 71 and the right end of the screen 72. A plurality of magnets 76 disposed in the inner space of the protector 71 and the screen 72, and a magnet holder 80 connected to the end plate 73 and holding the plurality of magnets 76 at a constant interval are configured. .

  The protector 71 is an outer cylinder member formed by forming a metal perforated plate (punching metal) having a large number of through holes 71a (only a part of which is shown in FIG. 3) in a cylindrical shape. The outer diameter of the protector 71 is smaller than the inner diameter of the pipe member 31, and a predetermined outflow space (outside space) S3 is defined between the outer peripheral surface of the protector 71 and the inner peripheral surface of the pipe member 31. Be done. The outflow space S3 communicates with the inside of the oil tank 100 through a plurality of drain holes 34 formed in the end plate 32.

The screen 72 is a filter medium formed by forming a nonmagnetic metal mesh such as stainless steel having a large number of fine meshes 72a (only a part of which is shown in FIG. 3) in a cylindrical shape. The screen 72 is stretched along the inner peripheral surface of the protector 71 using joining means such as spot welding, and a predetermined inflow space (inner space) S2 is defined by the inner peripheral surface of the screen 72. Is made. The inflow space S2 communicates with the drain pipe 110 (the drain circuit of the hydraulic pump) through the inflow hole 61 of the head 60. The inflow space S2 and the outflow space S3 are formed by separating the protector 71 and the screen 72. The inflow space S2 is a pre-filtering space through which the hydraulic oil (hydraulic oil before filtration) flows before passing through the screen 72. S3 is a post-filtering space through which the hydraulic oil (the hydraulic oil after filtration) after passing through the screen 72 flows.

  The end plate 73 is an annular member that forms the bottom of the strainer 50, and is formed of a combination of two plates (a first plate 74 and a second plate 75). The end plate 73 holds the protector 71 and the screen 72 in a state of being held between the outer peripheral portions of the first plate 74 and the second plate 75.

  The magnet 76 magnetically adsorbs and captures metal powder mixed in the hydraulic oil. The plurality of magnets 76 are arranged at regular intervals by a magnet holder 80 described later. The magnet 76 is a permanent magnet formed in an annular shape, and for example, a rare earth magnet, an alloy magnet, a ferrite magnet or the like can be applied.

  The magnet holder 80 is disposed on the center axis of the strainer 50 by being screwed into the pop nut 81 provided at the axial center position of the end plate 73 and fastening the two plates 74 and 75 and the pop nut 81. A bolt 82, a plurality of spacers 83 disposed on the front and back of each magnet 76 in a state of being inserted into the bolt 82, and a plurality of magnets 76 in an axial direction are equally spaced in a state of being inserted into the bolt 82 And a plurality of spacers 84.

  The pop nut 81 is a fastener that can be crimped from one direction using a tool such as a riveter. With the two plates 74 and 75 being inserted through the pop nut 81, the two plates 74 and 75 can be obtained by axially squeezing and caulking the pop nut 81 (by buckling). It fixes in the state clamped by the crimping part of the pop nut 81. As shown in FIG. A reinforcement washer 77 is simultaneously crimped to the pop nut 81 together with the two plates 74 and 75.

  The bolt 82 is screwed to the pop nut 81 and is disposed at the center (axial center position) of the end plate 73 via the pop nut 81. Therefore, the bolt 82 is disposed on the same axis as the shaft 41 of the check valve 40. Three magnets 76, six spacers 83, and three spacers 84 are inserted through the bolts 82 in a predetermined arrangement order.

  The spacer 83 is formed in a thin disk shape having an inner and outer diameter substantially the same as the inner and outer diameters of the magnet 76, and is disposed so as to cover the entire front and back of the magnet 76.

  The spacer 84 is an elongated cylindrical member for holding the plurality of magnets 76 at a constant interval, and has an axial length corresponding to the interval.

  In the magnet holder 80 having such a configuration, the right end portion (right end portion of the bolt 82) of the magnet holder 80 resists the check valve 40 against the biasing force of the coil spring 43 when the strainer 50 is attached to the casing 10. It plays a role of pressing in the valve opening direction (right direction). That is, the magnet holder 80 functions as an operation unit for opening the check valve 40.

  Next, in order to facilitate understanding of the present embodiment, an operation of the drain filter device 1 will be described with additional reference to FIGS. 4 to 7.

  First, the procedure for attaching the strainer 50 to the casing 10 will be described. Before the strainer 50 is attached to the casing 10, the check valve 40 is in a closed position in contact with the seating surface 35 of the end plate 32 under the elastic force of the coil spring 43. Drain hole 34 is closed.

  First, as shown in FIG. 4, in order to attach the strainer 50 to the casing 10, the strainer 50 is straightly inserted into the strainer disposition space S1 of the casing 10 with the horizontal posture. Subsequently, as shown in FIG. 5, the strainer 50 is further inserted into the casing 10, and the male screw portion 64 of the head 60 reaches the female screw portion 23 of the flange 20. The male screw portion 64 of the head 60 is screwed into the female screw portion 23 of the flange 20 while being rotated. At this time, when the magnet holder 80 (bolt 82) of the strainer 50 abuts on the shaft 41 of the check valve 40, the strainer 50 receives the elastic force (spring load) of the coil spring 43 via the shaft 41. When the strainer 50 is further pushed into the casing 10 against this, the check valve 40 is pushed in the valve opening direction (right direction). As a result, the check valve 40 is separated from the seat 35, and the plurality of drain holes 34 formed in the end plate 32 are opened. Then, as shown in FIG. 6, the strainer 50 is further inserted, and when the washer portion 63 of the head 60 abuts against the left end surface of the flange 20, the O ring 66 attached to the head 60 is pressed and elastically deformed. Thus, the O-ring 66 is in close contact with the head 60 and the flange 20 to provide a fluid-tight seal between the strainer 50 and the casing 10. As a result, the strainer 50 is completely attached to the casing 10. As described above, in the state where the strainer 50 is attached to the casing 10, the inside of the strainer arrangement space S1 and the inside of the oil tank 100 communicate with each other through the drain hole 34. The hydraulic oil can be distributed between the two. Further, in a state where the strainer 50 is attached to the casing 10, the strainer arrangement space S1 is separated from the protector 71 and the screen 72 and is connected to the dirty side (inflow space S2) connected to the drain pipe 110 and the oil tank 100. It is divided into a clean side (flow space S3) to be connected.

  Subsequently, the flow of the hydraulic oil (drain oil) filtered by the strainer 50 attached to the casing 10 as described above will be described. In FIG. 6, the flow of hydraulic oil (drain oil) is represented by arrow F.

  Among the hydraulic oil supplied from the oil tank 100 to the hydraulic pump, the hydraulic oil (drain oil) drained by the hydraulic pump is returned from the drain pipe 110 to the drain filter device 1. The hydraulic oil returned to the drain filter device 1 is introduced into the inner space (inflow space S2) of the strainer 50 and flows from the inner peripheral side to the outer peripheral side of the screen 72, but mixed with the hydraulic oil at this time Foreign matter such as metal powder is filtered by the screen 72. The hydraulic oil thus filtered flows into the outer space (outflow space S3) of the strainer 50 through a large number of through holes 71a formed in the protector 71 (punching metal). In addition, since the outer peripheral surface of the screen 72 is in close contact with the inner peripheral surface of the protector 71, the hydraulic fluid does not significantly deform even if hydraulic fluid flows from the inner inflow space S2 to the outer outflow space S3. Then, the hydraulic oil (the hydraulic oil cleaned by the screen 72) that has flowed into the outflow space S3 is introduced into the oil tank 100 through the plurality of drain holes 34 in the fully open state.

Here, in the drain filter device 1 configured as described above, since the screen 72 is clogged (the performance of the screen 72 is degraded) due to long-term use, the strainer 50 is periodically removed for inspection It is necessary to perform maintenance such as replacement. Therefore, a procedure for removing the strainer 50 from the casing 10 will be described. The procedure for removing the strainer 50 is basically the reverse of the procedure for installing the strainer 50.

  First, the strainer 50 is pulled out of the casing 10 while rotating the strainer 50 in the anti-screwing direction to unscrew the male screw 64 of the head 60 and the female screw 23 of the flange 20. As shown in FIG. 7, when the strainer 50 is pulled out of the casing 10 and the strainer 50 separates from the shaft 41 of the check valve 40, the check valve 40 moves in the valve closing direction by the elastic force of the coil spring 43. A valve 40 abuts against the seating surface 35 of the end plate 32 to close all drain holes 34. Therefore, even if the strainer 50 is removed from the casing 10, all the drain holes 34 are closed by the check valve 40, so that the hydraulic oil stored in the oil tank 10 leaks from the drain holes 34 to the outside. It can be prevented.

  As described above, according to the drain filter device 1 of the present embodiment, when the strainer 50 is attached to the casing 10, the magnet holder 80 presses the check valve 40 to the open position against the biasing force of the coil spring 43. When the drain hole 34 of the casing 10 is opened and the strainer 50 is removed from the casing 10, the magnet holder 80 separates from the check valve 40 and the coil spring 43 biases the check valve 40 to the closed position. The hydraulic fluid stored in the oil tank 100 can be prevented from leaking to the outside at the time of replacement / inspection of the strainer 50 by closing the drain hole 34 of the oil tank 100. It becomes possible to improve maintainability.

  As a modification of the drain filter device 1, a discharge groove (notch) extending in the axial direction is recessed on the outer peripheral surface of the head 60, and the strainer 50 is removed from the casing 10 in the casing 10. The remaining hydraulic oil may be configured to be able to be discharged to the outside through the above-mentioned discharge groove (notch). Specifically, such a modification will be described with reference to FIG. In such a modification, a plurality of discharge grooves 59 extending in the axial direction (the mounting and demounting direction of the strainer 50) are formed in the portion where the male screw portion 64 of the strainer 50 is formed. FIG. 8 exemplifies two discharge grooves 59 arranged at equal intervals (intervals of 180 degrees) in the circumferential direction. When the strainer 50 is removed from the casing 10 (when the fluid tight state by the O-ring 66 is released), one of the two discharge grooves 59 is one discharge groove 59 (in FIG. 8) according to the rotational position of the strainer 50. The lower outflow groove 59a) serves as a groove for drawing out the hydraulic oil remaining in the casing 10 to the outside, and the other exhaust groove 59 (the upper exhaust groove 59b in FIG. 8) feeds air from the outside into the casing 10. It becomes a groove for introducing.

  In such a modification, when the strainer 50 is removed from the casing 10, the strainer 50 is rotated in the anti-screwing direction with respect to the casing 10 to loosen the screwing between the male screw portion 64 and the female screw portion 23. When the liquid-tight state (sealed state) by the ring 66 is released, the inside of the casing 10 communicates with the outside through the two discharge grooves 59, and the hydraulic oil remaining in the casing 10 is discharged to one discharge groove 59. Will be discharged gradually. In that case, the rotational position of the strainer 50 is adjusted, and one discharge groove 59 is disposed at the 6 o'clock position (lower end) in side view, and the other discharge groove 59 is 12 o'clock position in side view (upper end It is preferable that the hydraulic oil remaining in the casing 10 be discharged from the one discharge groove 59 to the outside quickly. In addition, since the discharge position (discharge groove 59) of the hydraulic oil remaining in the casing 10 is limited, the discharge operation (recovery operation) of the hydraulic oil becomes very easy. Then, when the force of the hydraulic oil discharged to the outside from the discharge groove 59 weakens, the strainer 50 is further rotated in the anti-screwing direction and pulled out from the casing 10, and the hydraulic oil is removed when the strainer 50 is removed. It can be easily recovered without being scattered on the floor or the like.

Therefore, according to the present modification, when removing the strainer 50 from the casing 10, the hydraulic oil remaining in the casing 10 can be gradually discharged from the discharge groove 59 of the strainer 50. The oil does not scatter on the floor surface or the like, and the hydraulic oil can be discharged easily. When the strainer 50 is removed from the casing 10, the hydraulic oil remaining in the casing 10 is alternately discharged from the two discharge grooves 59 while the strainer 50 is slowly rotated in the anti-screwing direction with respect to the casing 10. You may do so.

  Here, in the above-mentioned modification, although the configuration in which the two discharge grooves 59 are formed on the outer peripheral surface of the strainer 50 is illustrated, the present invention is not limited to this configuration, for example, on the outer peripheral surface of the strainer 50 Only one discharge groove 59 or three or more discharge grooves 59 may be formed. Further, in the above modification, the discharge groove 59 is formed linearly along the axial direction on the outer peripheral surface of the strainer 50, but the present invention is not limited to this configuration. For example, the discharge groove 59 is axially rotated about It may be formed in a spiral shape. Further, in the above modification, the discharge groove 59 is formed only on the outer peripheral surface (male screw portion 64) of the strainer 50, but the same discharge groove is also formed on the inner peripheral surface (female screw portion 23) of the flange 20. You may form. In that case, it is preferable to form a discharge groove at the lower end position on the inner circumferential surface 20 of the flange. According to this, when the strainer 50 is removed, when the discharge groove 59 of the strainer 50 comes to the lower end position and is aligned with the discharge groove of the flange 20 in the circumferential direction, the area of the discharge passage of hydraulic oil is expanded. As the amount of discharge of hydraulic oil increases, it is possible to discharge the hydraulic oil remaining in the casing 10 more quickly.

  Although the preferred embodiments of the present invention have been described above, the present invention is not limited to the above-described embodiments, and improvements can be made as appropriate without departing from the scope of the present invention.

  Although the filter element (strainer 50) detachably mounted on the casing 10 and filtering the hydraulic oil is described as an example of the removable member in the above embodiment, the present invention is not limited to this configuration. The present invention may be applied to various detection sensors (such as a temperature sensor for detecting the temperature of the hydraulic fluid, a viscosity sensor for detecting the viscosity of the hydraulic fluid, etc.) which are detachably mounted to the sensor 10 and detect physical properties of the hydraulic fluid. The detection sensor is provided along the axial direction on the head 60 described above, a detection unit (action unit) provided at the end of the head 60 to detect physical properties of hydraulic oil, and provided at the end of the detection unit And an operation unit for pressing the check valve 40 integrally. In such a configuration, when the detection sensor is attached to the casing 10, the operation unit presses the check valve 40 in the valve opening direction to open the plurality of drain holes 34. Thus, when the detection sensor is attached to the casing 10, the detection unit detects physical properties (for example, temperature, viscosity, etc.) of the hydraulic oil stored in the casing 10 (in the oil tank 100). On the other hand, when the detection sensor is removed from the casing 10, the coil spring 43 biases the check valve 40 in the valve closing direction by closing the operation hole from the check valve 40, thereby closing the plurality of drain holes 34. Therefore, even when the detection sensor is applied as the detachable member as described above, it is possible to prevent the hydraulic oil stored in the oil tank 100 from leaking to the outside when the detection sensor is removed from the casing 10.

  Although the check valve 40 is formed by combining two or more components (the shaft 41 and the valve body 42) in the above embodiment, the present invention is not limited to this configuration, and the check valve 40 may be a single component And may be integrally formed.

  In the above embodiment, the strainer 50 is attached to the casing 10 by screwing the male screw portion 64 of the head 60 and the female screw portion 23 of the flange 20. For example, the outer peripheral surface of the head 60 and the inner peripheral surface of the flange 20 are fitted without forming the screw portions 23 and 64 in the head 60 and the flange 20 (in this case, both are fitted) After that, the strainer 50 may be configured to be attached to the casing 10 by fastening with a bolt or the like.

  In the above embodiment, the magnet holder 80 (bolt 82) functions as an operation unit for pressing the check valve 40. However, the present invention is not limited to this configuration, and the end plate 73 presses the check valve 40. You may comprise so that it may function as an operation part for.

  In the above embodiment, as the filter material of the filter element (strainer 50), the screen 72 formed of a wire mesh or the like having a large number of fine meshes has been described as an example, but it is not limited to this configuration. A filter medium formed by pleating a nonwoven fabric or the like in a bellows shape may be applied.

  In the above embodiment, the hydraulic oil is described as an example of the liquid (fluid) stored in the fluid tank, but the present invention is not limited to this configuration. For example, other liquids such as water, lubricating oil, fuel, etc. May apply.

  Although the above-mentioned embodiment illustrated and explained the case where the fluid valve device concerning the present invention was applied to a drain filter device, it is not limited to this composition, for example, a return filter device, a suction filter device, a line filter The same effect can be obtained even when applied to other filter devices (filter devices) such as devices.

1 drain filter device 10 casing (casing member)
20 Flange 22 strainer mounting hole (mounting hole)
23 Female thread 30 Casing body 40 Check valve (open / close valve)
41 shaft 42 valve body 43 coil spring (biasing means)
50 strainer (removable member, filter element)
59 Discharge groove (fluid discharge groove)
60 head (connection)
64 Male thread 66 O-ring (seal member)
68 O-ring 70 Strainer main body 71 Protector 72 Screen (filter material)
76 Magnet 80 Magnet holder (operation part)
82 bolt (operation part)
100 oil tank (fluid tank)
S1 Strainer installation space (housing space)
S2 inflow space (space before filtration)
S3 outflow space (space after filtration)

Claims (3)

A fluid valve device comprising: a casing member provided in a fluid tank for storing fluid and having a storage space therein; and a detachable member removably attached to the storage space,
The casing member has a casing main body in which an opening for communicating the inside of the accommodation space and the inside of the fluid tank is formed, an open position provided in the casing main body and opening the opening, and the opening And a biasing means provided on the casing body to bias the on-off valve to the closing position.
The mounting and demounting member includes an operating portion which is inserted into the housing space and comes into contact with the fluid, and an operating portion which is provided at one end of the mounting and demounting member and which can be in contact with the on-off valve. ,
When the attaching / detaching member is attached to the casing member, the opening is opened by pressing the on / off valve to the open position against the urging force of the urging unit when the operation unit is attached. And
When the detachable member is detached from the casing member, the opening part is closed by the operating unit being separated from the on-off valve and the biasing unit biasing the on-off valve to the closed position. A fluid valve device, characterized in that it is configured. The attachment / detachment member is a filter element having a filter medium for filtering a fluid as the action part,
The attaching / detaching member is disposed in the housing space to divide the housing space into a pre-filtering space and a post-filtering space and pass a fluid from the pre-filtering space to the post-filtering space through the filter medium. The fluid valve device according to claim 1, characterized in that it is possible to perform fluid filtration at The casing member has a mounting and demounting hole for communicating the housing space with the outside,
The detachable member is insertable into the storage space through the detachable hole,
The mounting and demounting member has a connecting portion having an outer peripheral surface formed to be screwed or fitted to the inner peripheral surface of the mounting and demounting hole when the mounting and demounting member is mounted to the casing member.
A seal member for sealing between the inner peripheral surface and the outer peripheral surface is provided between the inner peripheral surface of the attaching / detaching hole and the outer peripheral surface of the connecting portion,
A fluid discharge groove extending along the mounting and demounting direction of the mounting and demounting member is formed on the outer peripheral surface of the connection portion,
When removing the detachable member from the casing member, the fluid remaining in the accommodation space can be discharged to the outside through the fluid discharge groove after the sealing state by the seal member is released. The fluid valve device according to claim 1 or 2, characterized in that:

Images