JP4457059B2 - Fluid flow direction indicator - Google Patents

Description

  The present invention relates to a fluid flow direction display device in which the flow direction of a fluid flowing in a fluid flow channel can be visually observed from the outside.

  A pneumatic circuit that supplies compressed air from a compressed air source to a driving device such as a pneumatic cylinder is provided with control devices such as a pressure control valve that adjusts the pressure of the compressed air and a directional control valve that switches a flow path. In order to construct a pneumatic circuit by connecting fluid operating devices composed of a drive device and a control device to each other, piping composed of a tube or the like is used. Similarly, a control device such as a pressure regulating valve is used in a hydraulic circuit for supplying hydraulic oil pressurized by a pressurization source to a drive device, and a fluid operation device including the drive device and the control device is also used. The hydraulic circuit is configured by being connected to each other by piping. Furthermore, when water is supplied from the supply source side to the water supply member, pipes for water supply are used. Fluid guide pipes that guide liquids such as hydraulic pressure and water and gases such as air include tubes and hoses made of flexible materials such as rubber and soft resins, and metals and hard resins. There are pipes that are formed.

  When such a fluid guide pipe is connected to a fluid operating device composed of a drive device or a control device, the joint is attached to the fluid operating device, and a joint is also used when connecting pipes to each other. It also functions as a fluid guide tube that guides the fluid.

In order to display the flow direction of the water in the pipe on the valve connected to the pipe that supplies water from the supply source, that is, the water supply side to the water supply area, as shown in Patent Document 1, a flow direction detection device is provided. Has been developed.
JP 2003-329188 A

  However, as in the above-described conventional flow direction detection device, the fluid pressure introduced into the conduit through each conduit opening by attaching two conduits to the conduit in communication with each other in the flow path. If the sphere is moved by the sphere, when the flow is stopped from the state where the water was flowing, the sphere will hold the position, so this is applicable when the water is always flowing in either direction. However, it cannot be applied to a fluid circuit in which the flow may be stopped because it cannot be detected whether the flow is stopped. In addition, if a flow path that bypasses the pipeline is formed by connecting the water conduit outside the pipeline, and a sphere is incorporated in the flow channel, the pipeline is not placed in a fixed posture. Depending on the direction of the water conduit, it may be difficult to see the position of the detour sphere from the outside.

  An object of the present invention is to detect whether or not a fluid is flowing inside a fluid guide tube, and to make it possible to visually confirm the direction when the fluid is flowing.

  Another object of the present invention is to detect whether or not a fluid is flowing in the fluid guide tube from any direction, regardless of the arrangement state of the fluid guide tube, and in the case where the fluid is flowing. Is to be able to observe from the outside.

  A fluid flow direction display device according to the present invention is a fluid flow direction display device that displays a fluid flow direction in a fluid flow path, and an outer cylinder that forms an outline of the fluid flow direction display device, An inner cylinder provided inside the outer cylinder, in which the fluid flow path is formed, a storage chamber formed between the inner cylinder and the outer cylinder, and an axial direction in the storage chamber And a display member that divides the storage chamber into a first fluid chamber on one axial end side and a second fluid chamber on the other axial end side, and communicates with the first fluid chamber A forward communication hole that is formed in the inner cylindrical body and supplies the fluid flowing in the forward direction through the fluid flow path to the first fluid chamber; and the inner cylindrical body communicated with the second fluid chamber. A reverse communication hole for supplying a fluid flowing in the reverse direction in the fluid flow path to the second fluid chamber And when the fluid flows into the first fluid chamber, the display member is allowed to move to a forward display position, and when the fluid flows into the second fluid chamber, A spring member that allows the display member to move to a reverse display position and moves the display member to a neutral position when no fluid is flowing, and is provided on the outer cylinder so that the display member is displayed externally. A neutral position display unit that displays that the display member is in the neutral position, a forward display unit that displays that the forward position is present, and the reverse direction The display member is provided with a reverse direction display unit for indicating that the position is reached.

  The fluid flow direction display device of the present invention is characterized in that a guide surface for guiding fluid to the first fluid chamber and a guide surface for guiding fluid to the second fluid chamber are provided on the inner cylinder. And

  The fluid flow direction display device of the present invention is characterized in that the display window is formed by a member having transparency.

  In the fluid flow direction display device of the present invention, an arrow indicating a forward fluid flow is marked on the forward direction display section, and an arrow indicating a backward fluid flow is marked on the reverse direction display section. Features.

  The fluid flow direction display device of the present invention is characterized in that the neutral position display unit, the forward direction display unit, and the reverse direction display unit have different colors.

  In the fluid flow direction display device of the present invention, the fluid flow path is formed inside a joint that connects a pipe to a fluid working device.

  In the fluid flow direction display device of the present invention, the fluid flow path is formed inside a joint that connects pipes to each other.

  The fluid flow direction display device of the present invention is characterized in that the fluid flow path is formed inside a pipe.

  According to the present invention, the neutral position indicator of the display member is observed from the outside through the display window when no fluid flows in the fluid flow path, and depending on the direction when the fluid flows in the fluid flow path. Since the flow direction indicator is observed from the outside through the display window, it is detected whether or not the fluid is flowing in the fluid flow path, and in the case of the flow, the direction is provided on the outer cylinder. It can be visually confirmed by the position of the display member through the display window.

  By providing a guide surface for guiding the fluid to the first fluid chamber and a guide surface for guiding the fluid to the second fluid chamber on the inner cylinder, the fluid flowing through the fluid flow path can be reliably transferred to each fluid chamber. Can be supplied. Colors can be added to the neutral position display part, forward direction display part and reverse direction display part on the display member, and the forward direction display part and the reverse direction display part should be replaced with color or in addition to this, an arrow should be marked. The position of the display member can be easily confirmed from the outside.

  Since the display member is provided in the storage chamber formed between the outer cylinder and the inner cylinder, and the display member is displayed outside through the display window, the direction of the outer cylinder is determined. Even if it faces, the position of the display member can be easily confirmed from the outside through the display window.

  The flow direction display device of the present invention can be incorporated in the middle of a piping path as a joint for connecting a pipe such as a hose to a fluid operating device, a joint for connecting pipes to each other, and the pipe itself.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. In each of the illustrated embodiments, members having a common function are denoted by the same reference numerals.

  FIG. 1 is a longitudinal sectional view showing a joint provided with a fluid flow direction display device according to an embodiment of the present invention, and FIG. 2 is a transverse sectional view seen from the direction of line 2-2 in FIG. . A joint 10 shown in FIG. 1 is a straight-type pipe joint, and is attached to a fluid operation device such as a drive device or a control device that constitutes a pneumatic circuit as a fluid pressure circuit. A tube 11 as a pipe is connected to the joint 10. It is designed to be removably connected. The joint 10 has a cylindrical first joint structure 13 attached to the fluid operating device 12, and the inside of the first joint structure 13 is communicated with the fluid flow path 14. The first joint component 13 is provided with a male screw 15 that is screwed to the fluid operating device 12. A cylindrical second joint structural body 16 is assembled to the first joint structural body 13.

  The second joint component 16 includes an inner cylindrical body 17 having a fluid flow path 14 formed therein, and a large-diameter base end 18 integrated therewith. An outer cylindrical body that forms a cylindrical accommodation chamber 21 with the inner cylindrical body 17 when the first joint structural body 13 is assembled to the first joint structural body 13 as shown in the figure. 22 is provided integrally. The outer cylindrical body 22 forms an outer shell of the joint 10.

  In order to fasten the first joint component 13 and the second joint component 16, a male screw that is screw-coupled to a female screw formed on the first joint component 13 is provided on the outer periphery of the distal end portion of the inner cylinder 17. 23 is formed, and a seal member 24 that contacts the end of the outer cylindrical body 22 is attached to the second joint component 16 in order to prevent fluid from leaking from the inside of the storage chamber 21.

  The tube 11 is configured to be connected to the second joint structure 16 in a state where the tube 11 is in contact with an abutting surface 25 formed on the second joint structure 16, and the tube 11 is connected to the second joint structure 16. When connected to the body 16, the fluid flow path in the tube 11 is in communication with the fluid flow path 14 in the joint 10. The base end portion 18 of the second joint component 16 incorporates an annular sealing material 26 made of rubber that contacts the outer peripheral surface of the tube 11 to prevent fluid leakage, and is adjacent to the sealing material 26 and has an annular shape. The lock claw 27 is incorporated, and the sealing material 26 and the lock claw 27 are attached to the second joint component 16 by a fixing ring 28 fitted to the base end portion 18. An engaging claw 28 a is provided on the outer peripheral surface of the fixing ring 28, and when the fixing ring 28 is fitted to the base end portion 18, the engaging claw 28 a engages with a concave groove formed in the base end portion 18. Thus, the fixing ring 28 is prevented from coming off from the second joint structure 16.

  The lock claw 27 is formed of a spring material such as stainless steel, and has an outer piece 27 a that contacts the inner peripheral surface of the second joint component 16 and an inner piece 27 b that bites into the outer periphery of the tube 11. 27 a and the inner piece 27 b are integrated with each other via a folded portion 27 c on the opening side of the second joint component 16. In the lock claw 27, the inner piece 27b is elastically deformed in the radial direction starting from the folded portion 27c, and the tip of the inner piece 27b bites into the tube 11 and applies a tightening force to the tube 11. In order to release the fastening force of the inner piece 27b to the tube 11 and remove the tube 11 from the joint 10, an open ring 29 is slidably fitted in the inner side of the fixing ring 28, A tapered portion 29a is provided at the tip of the release ring 29 to elastically deform the inner piece 27b radially outward when the release ring 29 is pushed into the inside, and to prevent the release ring 29 from slipping out of the fixing ring 28. A stopper 29 b that engages with the fixing ring 28 is provided.

  Therefore, in a state where the release ring 29 is pulled out to a position where the stopper 29 b of the release ring 29 engages with the fixing ring 28, the tube 11 is placed inside the second joint component 16 until it abuts against the abutment surface 25. When inserted, the inner piece 27 b of the lock claw 27 bites into the tube 11 by elastic force, and the tube 11 is fastened to the joint 10. When removing the tube 11 from the joint 10, the tube 11 can be removed from the joint 10 by pushing the release ring 29 and elastically deforming the inner piece 27 b of the lock claw 27 radially outward. As described above, the joint 10 shown in FIG. 1 is a quick joint that allows the tube 11 to be easily detached by pushing the opening ring 29.

  The accommodation chamber 21 formed between the outer surface of the inner cylinder 17 and the inner surface of the outer cylinder 22 has a cylindrical shape as shown in FIG. The display member 30 is mounted so as to be movable in the axial direction. The display member 30 causes the storage chamber 21 to have a first fluid chamber 31 on one end side in the axial direction of the display member 30 and a second fluid on the other end side in the axial direction. The fluid chamber 32 is partitioned.

  In FIG. 1, when the flow of the fluid in the left direction is the forward direction, that is, the forward direction as indicated by the arrow A, and the flow of the fluid in the right direction is the reverse direction as indicated by the arrow B, the inside of the inner cylinder 17 is directed in the forward direction. A forward communication hole 33 for supplying a flowing fluid to the first fluid chamber 31 is formed in the inner cylinder 17, and a reverse communication for supplying a fluid flowing in the reverse direction in the inner cylinder 17 to the second fluid chamber 32. A hole 34 is formed in the inner cylinder 17. In the illustrated case, each of the communication holes 33 and 34 is provided four by 90 degrees in the circumferential direction, but the number of the communication holes 33 and 34 may be arbitrary.

  As shown in FIG. 1, a spring member 35 made of a compression coil spring is disposed in each fluid chamber 31, 32, and a spring force toward the neutral position is applied to the display member 30 by both spring members 35. It has been. Therefore, when a fluid flows in the forward direction A in the fluid flow path 14, the display member 30 is resisted against the spring force by the pressure of the fluid flowing into the first fluid chamber 31 through the forward communication hole 33. 1, the spring member 35 allows the display member 30 to move to the forward position. On the other hand, when the fluid flows in the reverse direction B in the fluid flow path 14, the display member 30 is resisted against the spring force by the pressure of the fluid flowing into the second fluid chamber 32 through the reverse direction communication hole 34. 1, the spring member 35 allows the display member 30 to move to the reverse position.

  Here, in order to more smoothly guide the fluid in each flow direction to the forward communication hole 33 and the reverse communication hole 34, for example, the forward communication hole 33 and the reverse communication hole of the inner cylinder 17 are provided. 34 may be provided with an annular protrusion or a partial protrusion protruding radially inward. In this case, the projections exert a throttling effect on the fluid in each flow direction, and by this throttling effect, a differential pressure is obtained between the forward communication hole 33 and the reverse communication hole 34, respectively. In the flow direction, the fluid can be more smoothly guided to the forward communication hole 33 and the reverse communication hole 34.

  In order to view the position of the display member 30 from the outside, the outer cylindrical body 22 is provided with a display window 36 in an annular shape, and the position of the display member 30 is displayed to the outside through the display window 36. The display window 36 is formed in an annular shape by a transparent member such as glass or transparent resin, and the display window 36 made of a transparent material is bonded to the center portion of the outer cylindrical body 22 with an adhesive, thereby A display window 36 is provided on the entire circumference of the cylindrical body 22.

  FIG. 3 is a perspective view showing the display member 30. On the outer peripheral surface of the display member 30, a neutral position display unit 40 is provided in the center in the axial direction. The neutral position display unit 40 is configured so that no fluid flows in the fluid flow path 14 as shown in FIG. When the display member 30 is in the neutral position, the position corresponds to the display window 36. On the one side in the axial direction of the neutral position display section 40, a forward direction display section 41 for displaying that the fluid is flowing in the forward direction indicated by the arrow A in FIG. On the other side in the axial direction of the position display unit 40, a reverse direction display unit 42 that displays that the fluid is flowing in the reverse direction indicated by the arrow B in FIG.

  The neutral position display unit 40 is, for example, black, the forward direction display unit 41 is green, and the reverse direction display unit 42 is red. Whether or not the fluid flows in the fluid flow path 14 based on the position of the display member 30 in the axial direction, and if so, the direction of the flow is the forward direction A in FIG. Whether it is B can be visually observed from the outside. However, each color is an example, and any color can be given to each display unit 40 to 42 as long as the color is vivid and visible so that the position of the display member 30 from the outside can be visually observed. Further, the neutral position display unit 40 can color only the forward direction display unit 41 and the reverse direction display unit 42 as the background color of the material constituting the display member 30 without adding color to the neutral position display unit 40. You may make it attach.

  As shown in FIG. 3, the forward direction display unit 41 and the reverse direction display unit 42 are marked with arrows 43a and 43b indicating the flow direction of the fluid in addition to the colors, and the direction of the fluid from the direction of the arrows 43a and 43b. The flow direction can be visually confirmed from the outside. However, only the arrows 43a and 43b may be marked on both the display units 41 and 42 without coloring each display unit.

  As described above, the fluid flow direction can be visually observed from the outside through the display window 36 provided in an annular shape on the outer cylinder 22, so that the display member 30 can be viewed from any direction regardless of the arrangement state of the joint 10. By observing the position, it is possible to detect whether or not the fluid is flowing, and to confirm the flow direction.

  FIG. 4 is a cross-sectional view corresponding to a portion corresponding to FIG. 2, showing a modification of the outer cylinder 22 of the joint 10 shown in FIGS. 1 to 3. The outer cylinder 22 of the joint 10 is provided with six display windows 36 at predetermined intervals in the circumferential direction, and each display window 36 is transparent to a through-hole formed in the outer cylinder 22. It is formed by embedding a material. Other structures are the same as those of the above-described embodiment. Thus, even if the outer cylinder 22 is provided with a plurality of display windows 36 at predetermined intervals in the circumferential direction, the joint 10 is attached to the fluid operating device in any arrangement state as in FIG. However, the flow state of the fluid can be confirmed from the outside by any one of the display windows 36. Moreover, since the display window 36 is formed leaving the outer cylinder 22 at a predetermined interval in the circumferential direction, the strength of the outer cylinder 22 can be improved. Note that the number of display windows 36 is not limited to six and may be an arbitrary number.

  FIG. 5 and FIG. 6 are longitudinal sectional views showing joints provided with a fluid flow direction display device according to another embodiment of the present invention. In these figures, the joint 10 shown in FIGS. A portion corresponding to FIG. 1 is shown.

  In the joint 10 shown in FIG. 5, the outer cylindrical body 22 is provided integrally with the second joint constituent body 16, and the inner cylindrical body 17 having the fluid flow path 14 on the inner side thereof is provided integrally with the first joint constituent body 13. It has been. As shown in FIGS. 1 and 5, the inner cylinder 17 is integrally provided on one of the first joint component 13 and the second joint component 16, and the outer cylinder 22 is integrally provided on the other. be able to.

  In the joint 10 shown in FIG. 6, the outer tubular body 22 is integrally provided with the second joint component 16 and the pipe portion 17 a is integrally provided, and the pipe portion 17 b is integrally formed with the first joint component 13. When the first joint component 13 and the second joint component 16 are fastened, the tip surface 44a of each pipe part 17a and the tip surface 44b of the pipe part 17b are abutted. Thus, the inner cylinder 17 is assembled, and the fluid flow path 14 is formed inside thereof. In this case, a sealing material 45 is incorporated between both the tip surfaces 44a and 44b to prevent fluid from flowing into the storage chamber 21 from between the tip surfaces. In the joint 10 shown in FIGS. 5 and 6, the first joint component 13 is formed with a male screw 23 that is screw-coupled to a female screw formed at the end of the outer cylindrical body 22. Further, an annular protrusion or a partial protrusion protruding radially inward may be provided between the forward communication hole 33 and the reverse communication hole 34.

  FIG. 7 is a longitudinal sectional view showing a joint provided with a fluid flow direction display device according to another embodiment of the present invention. This joint 10 connects two tubes 11 as pipes to each other. And is formed by fastening the first joint component 13 and the second joint component 16, and the tube 11 is detachable from the first and second joint components 13 and 16, respectively. It comes to be attached to. Each of the first and second joint components 13 and 16 has a quick joint structure similar to the second joint component 16 shown in FIG. An outer cylindrical body 22 that forms the outline of the joint 10 is integrally provided, and an inner cylindrical body 17 in which the fluid flow path 14 is formed is integrally provided in the other second joint component 16.

  Also in this type of joint 10, as in the case shown in FIG. 5, the inner cylindrical body 17 is integrally provided on one first joint structural body 13, and the outer cylindrical body 22 is disposed on the other second joint structural body. 16 may be integrally provided. Further, an annular protrusion or a partial protrusion protruding radially inward may be provided between the forward communication hole 33 and the reverse communication hole 34.

  FIG. 8 is a longitudinal sectional view showing a joint provided with a fluid flow direction display device according to another embodiment of the present invention. In this joint 10, both fluid chambers 31, 32 of the joint 10 described above are shown. The spring member 35 is provided on the other end of the display member 30 facing the one fluid chamber 32, and the other end of the spring member 35 is engaged with the spring member 35. One end portion is provided to be engaged with the proximal end side of the tube portion 17b. Therefore, in the case shown in FIG. 8, when one spring member 35 generates both a tensile force and a compressive force and the natural length of the spring member 35, that is, when no spring force is applied, the display member 30 is neutral. It comes to be a position.

  As described above, the spring member 35 that applies a spring force toward the neutral position to the display member 30 and sets the display member 30 to the neutral position when no fluid is flowing through the fluid flow path 14 is provided with both coil springs. May be mounted in the fluid chambers 31 and 32, one coil spring may be mounted in one fluid chamber, and various types such as a leaf spring other than the coil spring may be used. be able to.

  In the display device shown in FIG. 8, the forward communication hole 33 and the reverse communication hole 34 are each inclined in a direction approaching the display member 30 toward the radially outer side of the inner cylindrical body 17. The fluid flowing in A is made easy to flow into the first fluid chamber 31, and the fluid flowing in the reverse direction B is made easy to flow into the second fluid chamber 32. In each of the above-described embodiments, the communication holes 33 and 34 may be inclined as in the case shown in FIG. Further, an annular protrusion or a partial protrusion protruding radially inward may be provided between the forward communication hole 33 and the reverse communication hole 34.

  The display member 30 shown in FIG. 8 is provided with an outer sealing material 37 for sealing between the outer surface of the display member 30 and the inner surface of the outer cylindrical body 22, and the inner surface of the display member 30 and the outer surface of the fluid guide tube 17. An inner sealing material 38 for sealing the gap is attached, and each of the outer sealing material 37 and the inner sealing material 38 is provided at both ends of the display member 30, but only at one end. You may make it provide. Moreover, you may make it provide each sealing material 37 and 38 in the flow direction display apparatus of each embodiment mentioned above.

  FIG. 9 is a longitudinal sectional view showing a joint provided with a fluid flow direction display device according to another embodiment of the present invention. The basic structure of this display device is the same as that shown in FIG. 5, and the outer surface of the inner cylindrical body 17 and the inner surface of the outer cylindrical body 22 are provided between both end surfaces of the display member 30 and the respective spring members 35. A sealing material 39 is provided for sealing. In FIG. 9, the sealing material 39 may be disposed only on one end of the display member 30. Further, an annular protrusion or a partial protrusion protruding radially inward may be provided between the forward communication hole 33 and the reverse communication hole 34.

  As described above, the fluid flow direction display device according to the present invention includes a joint 10 for connecting the tube 11 constituting the pipe line to the fluid operating device as shown in FIG. 1 to FIG. 6 and FIG. As shown in the figure, by incorporating two tubes 11 into a joint 10 for mutual connection, it is detected whether or not a fluid is flowing inside the joint 10 and, if it is flowing, the direction from the outside It can be confirmed visually. The structure of the joint is not limited to the illustrated quick joint, and the display device of the present invention can be applied to other types of joints such as a screw-type pipe joint, a bite-type joint, and a flare-type pipe joint.

  FIG. 10 and FIG. 11 are longitudinal sectional views showing pipes provided with a fluid flow direction display device according to another embodiment of the present invention, and each display device is a fluid flow path 14 for guiding fluid. The present invention is applied to the pipe provided with the inner cylinder 17.

  The inner cylinder 17 is formed of metal, hard resin, or the like, and as shown in the drawing, an outer cylinder 22 that forms an outline of the fluid flow direction display device is provided on the outer side via an annular spacer 46. A cylindrical storage chamber 21 is formed between the outer cylinder 22 and the inner cylinder 17. However, the spacer 46 may be formed integrally with the outer cylindrical body 22.

  A display member 30 is mounted in the storage chamber 21 so as to be movable in the axial direction as in the above-described embodiment, and the storage chamber 21 is partitioned into first and second fluid chambers 31 and 32 by the display member 30. The display member 30 is formed of a cylindrical member as in the case shown in FIG.

  10 and 11, forward communication holes 33 for supplying fluid flowing in the forward direction to the first fluid chamber 31 are formed in the inner cylindrical body 17 as indicated by an arrow A, and in the reverse direction as indicated by an arrow B. A reverse communication hole 34 for supplying a flowing fluid to the second fluid chamber 32 is formed in the inner cylinder body 17. A compression coil spring is disposed as a spring member 35 in each of the fluid chambers 31 and 32 positioned on both sides of the display member 30. A spring force toward the neutral position is applied to the display member 30 by both spring members 35. It has been. Accordingly, when a fluid flows in the forward direction A in the fluid flow path 14, the display member 30 moves to the left in the figure against the spring force by the pressure of the fluid. On the other hand, when the fluid flows in the reverse direction B in the fluid flow path 14, the display member 30 is resisted against the spring force by the pressure of the fluid flowing into the second fluid chamber 32 through the reverse direction communication hole 34. Move right.

  In order to view the position of the display member 30 from the outside, the outer cylindrical body 22 is provided with a display window 36 in an annular shape, and the position of the display member 30 is displayed to the outside through the display window 36. As in the case shown in FIG. 2, the display member 36 is not provided on the outer peripheral surface of the display member 30 when no fluid flows in the fluid flow path 14 and the display member 30 is in the neutral position as shown in FIG. A neutral position display section 40 corresponding to is provided at the axial center, and fluid flows in the fluid flow path 14 in the direction indicated by arrow A in FIG. 1 on one axial side of the neutral position display section 40. The forward direction display part 41 which displays that is being provided is provided. Further, a reverse direction display unit 42 is provided on the other axial side of the neutral position display unit 40 to display that the fluid is flowing in the reverse direction B in FIG. Even when the display device is incorporated in the pipe as described above, a plurality of display windows 36 may be provided in the outer cylindrical body 22 as shown in FIG. 4, and the display window 36 is formed of an annular transparent member. You may make it do.

  In the display device shown in FIG. 10, a protrusion 48a having a guide surface 47a for guiding the fluid flowing in the forward direction A through the fluid flow path 14 to the first fluid chamber 31, and the fluid flowing in the reverse direction B as the second fluid. A protrusion 48 b having a guide surface 47 b for guiding to the chamber 32 is provided on the inner surface of the inner cylindrical body 17.

  On the other hand, in the display device shown in FIG. 11, the guide surface 49 a that guides the fluid flowing in the forward direction A through the fluid flow path 14 to the first fluid chamber 31, and the fluid flowing in the reverse direction B in the second fluid chamber 32. Guide surfaces 49b are respectively provided on the inner surface of the inner cylinder 17, and the respective guide surfaces 49a, 49b are inclined so that the downstream side of the fluid flow approaches the fluid chambers 31, 32, respectively. It is connected to the inner surface of the communication holes 33 and 34.

  In addition to the protrusions 48a and 48b having the guide surfaces 47a and 47b as shown in FIG. 10, guide surfaces 49a and 49b made of inclined surfaces may be provided as shown in FIG. In the display device shown in FIGS. 10 and 11, as shown in FIG. 1, the radial communication holes 33 and 34 may be provided without providing guide surfaces, and the forward communication holes 33 and the reverse communication holes may be provided. An annular protrusion that protrudes radially inward may be provided between the hole 34 and the hole 34. Further, seal members 37 and 38 may be provided on the outer and inner sides of the display member 30 of the display device shown in FIGS. 10 and 11 as shown in FIG. 8, and both ends of the display member 30 are shown in FIG. The sealing material 39 may be disposed on the surface.

  1 to 9, the projections 48a and 48b having the guide surfaces 47a and 47b shown in FIG. 10 may be provided on the inner surface of the inner cylinder 17, and the guide surfaces 49a and 48b shown in FIG. 49b may be provided on the inner cylinder 17. Further, the inner cylindrical body 17 may be provided with protrusions 48a and 48b having both guide surfaces 47a and 47b and guide surfaces 49a and 49b.

  As shown in FIG. 10 and FIG. 11, if the display device of the present invention is applied to a pipe for guiding a fluid, the pipe is visually observed from the outside to detect whether or not the fluid is flowing inside the pipe. If so, the direction can be detected.

  FIG. 12 and FIG. 14 are longitudinal sectional views showing pipes provided with fluid flow direction display devices according to other embodiments of the present invention, respectively. Each display device pipes the outer cylindrical body 22 itself. The present invention is applied as follows.

  In FIG. 12, the outer cylinder 22 is made of metal or the like, and forms the outline of the fluid flow direction display device. On the radially inner side of the outer cylindrical body 22, annular convex portions 22c and 22d projecting inward are provided, and the annular convex portions 22c and 22d are the inner sides in which the fluid flow path 14 is formed. The cylindrical body 17 is supported in the axial direction. The annular protrusions 22c and 22d are formed from the outer side of the outer cylindrical body 22 toward the inner side by pressurizing means such as roll processing. An annular display window 36 is provided in the center of the outer cylinder 22 in FIG. The display window 36 is bonded to the outer cylinder 22 with an adhesive or the like, similar to that shown in FIG.

  The inner cylindrical body 17 includes enlarged diameter portions 17a and 17b whose radial dimensions on both axial sides are enlarged, and the enlarged diameter portions 17a and 17b are axially formed with respect to the annular convex portions 22c and 22d, respectively. It is supported. A forward direction communication hole 33 and a reverse direction communication hole 34 are respectively formed in the vicinity of the enlarged diameter portions 17a and 17b in the inner cylindrical body 17, and radially inward of the forward direction communication hole 33 and the reverse direction communication hole 34. The inner portions 33a and 34a located in the position function as guide surfaces for guiding the fluid to the first and second fluid chambers 31 and 32, respectively.

  Between the outer cylindrical body 22 and the inner cylindrical body 17 is formed a cylindrical storage chamber 21 for storing the display member 30 formed of resin, metal, or the like. As shown in FIG. 13 showing a 3-3 cross section, display pieces 30a and 30b constituting a display member 30 divided into two parts in the vertical direction are accommodated slidably in the axial direction. However, the display member 30 may not be divided into the display pieces 30a and 30b but may be formed as an integral cylinder.

  On both ends of the display member 30 in FIG. 12, spring members 35 are provided that apply a spring force in the direction in which the display member 30 is in the neutral position. The display member 30 is balanced when the fluid is not flowing through the fluid flow path 14 by the spring force of the spring member 35, so that the neutral position display unit 40 faces the display window 36. The display member 30 is partitioned so as to form first and second fluid chambers 31 and 32 on both end sides thereof.

  Here, when the inner cylinder 17, the display member 30, and the spring member 35 are assembled to the outer cylinder 22, one of the annular protrusions 22 c and 22 d is formed in advance. Thereafter, the inner cylindrical body 17, the display member 30 and the spring member 35 are sequentially assembled as shown in FIG. 12 from the side where the annular convex portion of the outer cylindrical body 22 is not formed, and finally the other annular convex portion is formed. Can be assembled.

  According to the embodiment in FIG. 12 configured as described above, it is possible to obtain the same operational effects as those in the embodiment shown in FIGS. 10 and 11. Further, according to the embodiment in FIG. Since the inner cylinder 17, the display member 30 and the spring member 35 are incorporated inside the cylinder 22 and the display window 36 is provided in the outer cylinder 22, the outer periphery of the pipe is cleaned and the appearance is improved. Can do. Further, if the display member 30 is formed of resin, even if the display member 30 moves in the storage chamber 21, even if it contacts the outer cylinder 22 or the inner cylinder 17, the generation of noise due to this contact is suppressed. can do.

  As shown in the embodiment of FIG. 14, the seal member 39 may be provided on both ends of the display member 30 in the drawing, and furthermore, only on one end side of the display member 30 in the drawing. A sealing material 39 may be provided.

  In the embodiment shown in FIGS. 12 and 14, the forward communication hole 33 and the reverse communication hole 34 are formed in a circular shape in the vicinity of the enlarged diameter portions 17 a and 17 b of the inner cylindrical body 17. However, the present invention is not limited to this, and the forward communication holes 33 and the reverse communication holes 34 having a polygonal shape such as a triangle or a quadrangle may be provided, or a plurality of forward communication holes may be provided in the circumferential direction. 33 and the reverse direction communication hole 34 may be provided.

  The present invention is not limited to the above-described embodiment, and various modifications can be made without departing from the scope of the invention. For example, in each of the illustrated embodiments, compressed air is allowed to flow through the fluid flow path 14, but the display device of the present invention can also be applied when flowing a liquid such as hydraulic oil or water. it can.

It is a longitudinal section showing a joint provided with a fluid flow direction indicator which is one embodiment of the present invention. It is the cross-sectional view seen from the 2-2 line direction in FIG. It is a perspective view which shows the display member in FIG. 1 and FIG. It is a cross-sectional view which shows the part corresponded in FIG. 2 in the modification of the coupling shown in FIGS. It is a longitudinal cross-sectional view which shows the coupling provided with the flow direction display apparatus of the fluid which is other embodiment of this invention. It is a longitudinal cross-sectional view which shows the coupling provided with the flow direction display apparatus of the fluid which is other embodiment of this invention. It is a longitudinal cross-sectional view which shows the coupling provided with the flow direction display apparatus of the fluid which is other embodiment of this invention. It is a longitudinal cross-sectional view which shows the coupling provided with the flow direction display apparatus of the fluid which is other embodiment of this invention. It is a longitudinal cross-sectional view which shows the coupling provided with the flow direction display apparatus of the fluid which is other embodiment of this invention. It is a longitudinal cross-sectional view which shows the piping provided with the flow direction display apparatus of the fluid which is other embodiment of this invention. It is a longitudinal cross-sectional view which shows the piping provided with the flow direction display apparatus of the fluid which is other embodiment of this invention. It is a longitudinal cross-sectional view which shows the piping provided with the flow direction display apparatus of the fluid which is other embodiment of this invention. It is the cross-sectional view seen from the 3-3 line direction in FIG. It is a longitudinal cross-sectional view which shows the piping provided with the flow direction display apparatus of the fluid which is other embodiment of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Joint 12 Fluid operation apparatus 13 1st joint structure 14 Fluid flow path 15 Male thread 16 2nd joint structure 17 Inner cylinder 18 Base end part 21 Accommodating chamber 22 Outer cylinder 23 Male thread 24 Sealing material 25 Butting surface 26 Seal material 27 Lock claw 28 Fixing ring 29 Release ring 30 Display member 31 Fluid chamber 32 Fluid chamber 33 Forward communication hole 33a Inner portion (guide surface)
34 Reverse communication hole 34a Inner part (guide surface)
35 Spring member 36 Display window 37 to 39 Sealing material 40 Neutral position display part 41 Forward direction display part 42 Reverse direction display part 45 Sealing material 46 Spacer 47a, 47b Guide surface 48a, 48b Protrusion 49a, 49b Guide surface

Claims (8)

A fluid flow direction display device for displaying a fluid flow direction in a fluid flow path,
An outer cylinder that forms an outline of the fluid flow direction display device;
An inner cylinder that is provided inside the outer cylinder and in which the fluid flow path is formed;
A storage chamber formed between the inner cylinder and the outer cylinder;
A display member that is mounted in the storage chamber so as to be movable in the axial direction, and divides the storage chamber into a first fluid chamber on one axial end side and a second fluid chamber on the other axial end side;
A forward communication hole that is formed in the inner cylinder so as to communicate with the first fluid chamber, and that supplies the fluid flowing in the forward direction through the fluid flow path to the first fluid chamber;
A reverse communication hole that is formed in the inner cylindrical body in communication with the second fluid chamber, and that supplies the fluid flowing in the reverse direction through the fluid flow path to the second fluid chamber;
When the fluid flows into the first fluid chamber, the display member is allowed to move to a forward display position, and when the fluid flows into the second fluid chamber, the display is provided in the storage chamber. A spring member that allows movement of the member to a reverse display position and moves the display member to a neutral position when no fluid is flowing;
A display window provided on the outer cylinder and displaying the display member on the outside;
Have
A neutral position display section that displays that the display member is in the neutral position, a forward direction display section that displays that the forward position is present, and a display that indicates the reverse position. A fluid flow direction display device, characterized in that a reverse direction display section is provided on the display member.   2. The fluid flow direction display device according to claim 1, wherein a guide surface for guiding fluid to the first fluid chamber and a guide surface for guiding fluid to the second fluid chamber are provided on the inner cylindrical body. A fluid flow direction display device.   3. The fluid flow direction display device according to claim 1, wherein the display window is formed of a transparent member.   The fluid flow direction display device according to any one of claims 1 to 3, wherein an arrow indicating a forward fluid flow is marked on the forward direction display unit, and a reverse direction fluid is displayed on the reverse direction display unit. An arrow indicating the flow of the fluid is marked.   The fluid flow direction display device according to any one of claims 1 to 4, wherein the neutral position display unit, the forward direction display unit, and the reverse direction display unit have different colors. A fluid flow direction display device.   The fluid flow direction display device according to any one of claims 1 to 5, wherein the fluid flow path is formed inside a joint connecting a pipe to a fluid operating device. Direction display device.   The fluid flow direction display device according to any one of claims 1 to 5, wherein the fluid flow path is formed inside a joint that connects pipes to each other. .   The fluid flow direction display device according to any one of claims 1 to 5, wherein the fluid flow path is formed inside a pipe.

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