JP5989935B1 - Piston valve bracket and piston valve bracket fixing structure - Google Patents

Abstract

The bracket (1) to which the present invention is applied is a plate-like body in which holes and long holes are formed in a metal main body (9). The main body (9) has a valve-side fixing piece (10) and a sensor-side fixing piece (11), and is a structure connected by two connecting pieces (12). Further, the main body (9) is formed with a central gap (13) surrounded by a valve-side fixing piece (10), a sensor-side fixing piece (11) and two connecting pieces (12). The valve side fixing piece (10) is formed with a screw hole (14), two long holes (15) and a long hole (16). The sensor side fixing piece (11) has a screw hole (17), two long holes (18) and a long hole (19).

Description

  The present invention relates to a piston valve bracket and a piston valve bracket fixing structure. More specifically, the present invention relates to a piston valve bracket and a piston valve bracket fixing structure that are excellent in heat dissipation and durability, and that allow a proximity sensor for detecting movement of the piston valve to be stably attached.

  Various piston valves that control the movement of fluid by the movement of the piston are used. The control target of the valve is not only water but also high-temperature and high-pressure steam, high-viscosity fluid, corrosive fluid, and the like, and is provided in a piping path or the like.

  For example, Patent Document 1 describes a piston valve that controls the supply of a high-viscosity adhesive used in an automobile body assembly line. In this way, a special fluid can be controlled by the piston valve.

  In addition, a proximity sensor may be attached to the piston valve in order to visually check the ON and OFF states that are linked to the opening and closing of the piston valve. More specifically, a metal bar indicator is attached to the piston, and the movement of the indicator is confirmed by detection of a proximity sensor.

  In order to avoid interference with the internal structure of the piston valve, the proximity sensor is mounted outside the piston valve body. For example, a hole is provided in the piston valve, and the indicator protrudes from the hole or is accommodated inside the hole according to the movement of the piston, and a proximity sensor is attached via a bracket in the vicinity of the position protruding from the hole.

  The bracket for attaching the proximity sensor to the piston valve is attached between the proximity sensor and the piston valve body using a fixing device such as a screw. This bracket has a shape as shown in FIG.

  As shown in FIG. 5, the bracket 100 has a valve fixing screw hole 101 and a sensor fixing screw hole 102. The valve fixing screw hole 101 has a screw fixing tap formed in a valve body (not shown).

  A screw fixing tap 103 is also formed in the sensor fixing screw hole 102. That is, the valve fixing screw and the sensor fixing screw are attached to the bracket 100 in directions opposite to each other.

JP 2012-145130 A

  However, when high-temperature and high-pressure steam is controlled by a piston valve, the piston valve itself is heated to high temperature. At that time, heat is transmitted through a valve fixing screw connecting the bracket and the piston valve body, and the temperature around the screw of the bracket is also about 100 ° C.

  As a result, heat is transferred to the proximity sensor side via the bracket, and the vicinity of the proximity sensor also becomes high temperature. The heat resistance temperature of a general proximity sensor is around 70 ° C., and there is a problem that the proximity sensor is destroyed by heat from steam. Moreover, since proximity sensors with high heat resistance are expensive, it is difficult to adopt them for highly versatile piston valves.

  In addition, it is considered that the material forming the bracket is a resin such as a plastic having a low thermal conductivity. However, when the resin material is used, the shape cannot be maintained by being deformed by high heat. Further, it is difficult to perform tapping for fixing the screw, and fixing using another member such as a nut is possible, but there is a problem that the number of members increases. Furthermore, there was a possibility that the strength would be insufficient.

  The present invention was devised in view of the above points, and has a piston valve bracket and a piston that are excellent in heat dissipation and durability, and that can stably attach a proximity sensor for detecting the movement of the piston valve. It aims at providing the fixation structure of the bracket for valves.

  In order to achieve the above object, a bracket for a piston valve according to the present invention includes a first member having a first through-hole and a first protrusion continuously provided at an end of the first member. A first projecting piece, a second projecting piece connected to the end of the first member opposite to the first projecting piece, substantially in parallel with the first projecting piece, and in the same direction; And a second member having a second through-hole formed in the inner peripheral surface thereof and having a thread groove formed therein, the first protruding piece and the second protruding piece being provided continuously.

  Here, the bracket can be fixed to the valve via the first member by the first member in which the first through hole is formed. That is, for example, tapping is performed on the side of the piston valve main body, and the bracket can be fixed to the piston valve using screws.

  In addition, the proximity sensor can be fixed to the bracket by the second member in which the second through hole having a thread groove formed on the inner peripheral surface is formed. That is, for example, by providing a screw penetration hole in the proximity sensor, inserting the screw into the hole of the proximity sensor, and fixing the tip of the screw in the second through hole, the proximity sensor is placed between the screw and the bracket. It can be clamped and fixed. The proximity sensor means a sensor that can detect the proximity of a metal material by a change in an electrical signal.

  Further, the first projecting piece connected to the end of the first member and the end of the first member opposite to the first projecting piece are substantially parallel to and in the same direction as the first projecting piece. The second projecting piece connected to the second projecting member and the second projecting member having both ends connected to the first projecting piece and the second projecting piece are arranged between the first member and the second member. A gap having the first protruding piece and the second protruding piece as ends is formed. As a result, the heat dissipation of the entire bracket is improved. Further, the heat conduction from the first member side to the second member side is via the first protruding piece or the second protruding piece. More specifically, it is transmitted through the end of the bracket, and requires more time for heat transfer than a flat plate shape without a gap, and is a peripheral region of the second through hole that fixes the proximity sensor. Can be difficult to reach high temperatures.

  Moreover, when a long hole is formed in the 1st member, the area in which the space | gap in the area of the whole bracket was formed becomes large, and it can improve heat dissipation further.

  Further, when a long hole having a short side with a length smaller than the diameter of the first through hole is formed in the first member, it is possible to eliminate misuse of inserting a screw into the long hole. That is, since the first through hole is a screw hole and the short side of the long hole is smaller than the diameter of the first through hole, the portion of the piston valve body side tapped through the long hole Incorrect attachment of the screws to the screws will not occur.

  Moreover, when a long hole is formed in the 2nd member, the area in which the space | gap was formed in the area of the whole bracket becomes large, and it can improve heat dissipation further.

Further, when the first member, the first projecting piece, the second projecting piece, and the second member are formed of a metal having a thermal conductivity of 30 W · m ⁻¹ · K ⁻¹ or less, the first member The efficiency of heat conduction from the member side to the second member side can be sufficiently lowered, and the peripheral region of the second through-hole for fixing the proximity sensor can be further prevented from becoming high temperature.

  Further, when the length in the longitudinal direction of the first projecting piece and the second projecting piece is 12 times the length in the width direction of the first projecting piece and the second projecting piece, the strength of the bracket It becomes a structure that can sufficiently secure In addition, the efficiency of heat conduction from the first member side to the second member side is sufficiently lowered, and the peripheral region of the second through hole for fixing the proximity sensor is further unlikely to become high temperature. it can. That is, the width of the first projecting piece and the second projecting piece is narrow, and the heat conduction path can be made smaller. Moreover, the length of the longitudinal direction of the 1st protrusion piece and the 2nd protrusion piece is long, and time will be required for heat conduction.

  Further, the thickness of the first member, the first protruding piece, the second protruding piece, and the second member is four times the length in the width direction of the first protruding piece and the second protruding piece. Thus, the structure can sufficiently secure the strength of the bracket.

  Further, when the first member, the first protruding piece, the second protruding piece, and the second member are formed of austenitic stainless steel or martensitic stainless steel, the second member is connected to the second member from the first member side. The efficiency of heat conduction to the member side can be sufficiently lowered, and the peripheral region of the second through hole for fixing the proximity sensor can be made more unlikely to become high temperature. More specifically, the value of the heat transfer efficiency is significantly lower than that of iron or carbon steel used as a bracket material.

  In order to achieve the above object, a piston valve bracket according to the present invention includes a first member having a first through hole and a first member connected to an end of the first member. A projecting piece of the first member, a second projecting piece connected to the end of the first member opposite to the first projecting piece, substantially parallel to the first projecting piece and in the same direction, and both ends Includes a second member which is connected to the first projecting piece and the second projecting piece and has a second through hole.

  Here, the proximity sensor can be fixed to the bracket by the second member having the second through hole formed on the inner peripheral surface. That is, for example, by providing a screw penetration hole in the proximity sensor, inserting a screw through the hole of the proximity sensor, inserting a screw through the second through hole, and fixing the tip of the screw with a nut, The proximity sensor can be attached to the bracket with screws and nuts.

  In order to achieve the above object, the piston valve bracket fixing structure according to the present invention includes a first screw, a second screw that can be fitted to a predetermined proximity sensor, and the first screw. A first member in which a first through-hole that can be fitted is formed; a first projecting piece continuously provided at an end of the first member; and the first projecting of the first member. A second projecting piece connected to the end opposite to the first piece in a direction substantially parallel to and in the same direction as the first projecting piece, and both ends connected to the first projecting piece and the second projecting piece. And a piston valve bracket having a second member having a second through hole formed with a thread groove on the inner peripheral surface and capable of fixing the second screw.

  Here, the bracket can be fixed to the piston valve by the first screw. That is, for example, tapping can be performed on the valve body side, and the first screw can be fitted into the first through hole of the first member and fixed to the valve body.

  In addition, by a second member that can be fitted to a predetermined proximity sensor, and a second member in which a thread groove is formed on the inner peripheral surface and a second through-hole that can fix the second screw is formed, The proximity sensor can be fixed to the bracket. That is, for example, by providing a screw penetration hole in the proximity sensor, inserting the screw into the hole of the proximity sensor, and fixing the tip of the screw in the second through hole, the proximity sensor is placed between the screw and the bracket. It can be clamped and fixed. The proximity sensor means a sensor that can detect the proximity of a metal material by a change in an electrical signal.

  Further, the first projecting piece connected to the end of the first member and the end of the first member opposite to the first projecting piece are substantially parallel to and in the same direction as the first projecting piece. The second projecting piece connected to the second projecting member and the second projecting member having both ends connected to the first projecting piece and the second projecting piece are arranged between the first member and the second member. A gap having the first protruding piece and the second protruding piece as ends is formed. As a result, the heat dissipation of the entire bracket is improved. Further, the heat conduction from the first member side to the second member side is via the first protruding piece or the second protruding piece. More specifically, it is transmitted through the end of the bracket, and requires more time for heat transfer than a flat plate shape without a gap, and is a peripheral region of the second through hole that fixes the proximity sensor. Can be difficult to reach high temperatures.

The bracket for a piston valve according to the present invention is excellent in heat dissipation and durability, and can be stably attached with a proximity sensor for detecting the movement of the piston valve.
The piston valve bracket fixing structure according to the present invention is excellent in heat dissipation and durability, and can be stably attached with a proximity sensor for detecting the movement of the piston valve.

It is the figure (a) which shows the state which the indicator protruded outside the valve | bulb, and the figure (b) which shows the state where the indicator was accommodated inside the valve | bulb. It is the schematic which shows the 1st Embodiment of this invention. It is the side view (a) which shows the state which the indicator protruded outside the valve | bulb, and the side view (b) which shows the state where the indicator was accommodated inside the valve | bulb. It is the front view (a) which shows the state which the indicator protruded the outer side of the valve | bulb, and the front view (b) which shows the state in which the indicator was accommodated inside the valve | bulb. It is the schematic (a) which shows the 2nd Embodiment of this invention, and the schematic (b) which shows the 3rd Embodiment of this invention. It is a schematic plan view which shows the structure of the conventional bracket.

Hereinafter, a first embodiment of the present invention will be described with reference to the drawings for understanding of the present invention.
FIG. 1A is a diagram illustrating a state in which the indicator protrudes outside the valve, and FIG. 1B is a diagram illustrating a state in which the indicator is accommodated inside the valve. In addition, the structure shown below is an example of this invention and the content of this invention is not limited to this.

  FIG. 1 shows a positional relationship between a piston valve, an indicator, and a bracket 1 as an example of a bracket to which the present invention is applied. A piston valve 2 shown in FIG. 1A includes a cylindrical cylinder 3, a piston 4 accommodated in the cylinder 3, and a valve portion 5.

  The cylinder 3 has a yoke stand 21. The piston 4 has a structure integrated with the stem 22.

  In the piston valve 2, the piston 4 is driven up and down in the cylinder 3 to open and close the valve unit 5, and the movement of high-temperature steam flowing through a piping path (not shown) connected to the valve unit 5 is controlled. Will be. 1A shows the opened state of the valve unit 5 (when ON), and FIG. 1B shows the closed state 2 of the valve unit 5 (when OFF).

  A metal indicator 6 is attached to the end of the piston 4, and the indicator 6 moves up and down in conjunction with the movement of the piston 4. Further, a through hole 7 is formed on the side surface of the cylinder 3, and the tip of the indicator 6 is configured to protrude outside the cylinder 3 through the through hole 7.

  That is, in FIGS. 1A and 1B, a part of the indicator 6 protrudes outside the piston valve 2 when the valve unit 5 is in an open state (when ON). Further, the indicator 6 is housed inside the piston valve 2 when the valve unit 5 is in the closed state 2 (OFF).

  A bracket 1 and a proximity sensor 8 are attached in the vicinity of the through hole 7 of the cylinder 3. The proximity sensor 8 can detect the presence of a metal body approaching the sensor due to a change in an electrical signal without contacting the detection target. The proximity sensor 8 can use a known proximity sensor.

  The proximity sensor 8 fixed to the bracket 1 detects the indicator 6 that protrudes outside the piston valve 2.

  FIG. 2 is a schematic diagram showing the first embodiment of the present invention. As shown in FIG. 2, the bracket 1 is a plate-like body in which holes and long holes are formed in a metal main body 9.

  The main body 9 has a valve-side fixing piece 10 and a sensor-side fixing piece 11, and has a structure in which these are connected by two connecting pieces 12. Further, the main body 9 is formed with a central gap 13 surrounded by the valve side fixing piece 10, the sensor side fixing piece 11 and the two connecting pieces 12.

  The valve side fixing piece 10 is formed with a screw hole 14, two long holes 15 and a long hole 16. A screw that can be fitted to the diameter of the screw hole 14 is inserted into the screw hole 14. The screw hole 14 is provided on the side surface of the cylinder 3 of the piston valve 2 and can be fixed to the tap groove. That is, the bracket 1 is fixed to the cylinder 3 through screws.

  The sensor side fixing piece 11 is formed with a screw hole 17, two long holes 18 and a long hole 19. The screw hole 17 is tapped so that a screw groove can be fixed. Further, the proximity sensor 8 is provided with a hole through which a screw can pass, and the tip of the screw that passes through the proximity sensor 8 is fixed in the screw hole 17. That is, the proximity sensor is fixed to the bracket 1 via the screw.

  Here, the screw hole 17 does not necessarily have to be tapped so that the screw thread groove can be fixed. For example, the screw hole 17 may be a through hole that does not cut a thread groove, and a structure in which the tip of the screw is fixed with a nut may be employed. However, it is preferable that the screw hole 17 is tapped so that the screw thread groove can be fixed, because the number of members required for fixing can be reduced by using no nut.

  The main body 9 is made of austenitic stainless steel (SUS304), and its thermal conductivity is 15 (W / (m · K)). The main body 9 has a short side of 21 mm, a long side of 50 mm, and a thickness of 2 mm. In addition, the short side of the central gap 13, that is, the length of the continuous piece 12 indicated by the symbol X is 6 mm, and the width of the continuous piece 12 indicated by the symbol Y is 0.5 mm.

The diameter of the screw hole 14 of the valve side fixing piece 10 is 4.2 mm, and the length of the short side of the two long holes 15 and 16 indicated by the symbol Z is 3.8 mm.
Is formed.

  In addition, the total area of the central gap 13, the screw hole 14, the long hole 15, the long hole 16, the screw hole 17, the long hole 18 and the long hole 19 in the plan view is the short side and the long side of the main body 9. Equivalent to about 50% of the area multiplied by. That is, a gap is formed in about half of the main body 9.

  Here, the two long holes 15 and the long holes 16 do not necessarily have to be formed in the valve side fixing piece 10. However, from the point of improving the heat dissipation of the bracket 1, it is preferable that the two long holes 15 and the long holes 16 are formed in the valve side fixing piece 10.

  Further, it is not always necessary to form the two long holes 18 and the long holes 19 in the sensor side fixing piece 11. However, in order to improve the heat dissipation of the bracket 1, it is preferable that the two long holes 18 and 19 are formed in the sensor side fixing piece 11.

  In addition, the main body 9 is not necessarily formed of austenitic stainless steel (SUS304), and any metal material having low thermal conductivity can be adopted. For example, martensitic stainless steel (SUS410) can also be used.

  The dimensions of the main body 9 are not limited to 21 mm for the short side, 50 mm for the long side, and 2 mm for the thickness, and can be appropriately changed according to the size of the piston valve or the proximity sensor.

  Further, the dimensions of the main body 9 are not necessarily limited to the thickness of the main body 9 being limited to 2 mm and the width of the connecting piece 12 being limited to 0.5 mm. However, it is preferable that the thickness of the main body 9 is 2 mm and the width of the connecting piece 12 is 0.5 mm from the viewpoint that the strength of the bracket can be sufficiently secured.

  Further, the length of the continuous piece 12 is not necessarily limited to 6 mm and the width to 0.5 mm. That is, the length of the continuous piece 12 need not be set to 12 times the length of the width. However, it is preferable that the length of the continuous piece 12 is 6 mm and the width is 0.5 mm from the viewpoint of reducing the heat conduction efficiency and ensuring the strength of the bracket 1.

  Moreover, the diameter of the screw hole 14 is not necessarily 4.2 mm, and the lengths of the long holes 15 and 16 on the short side are not necessarily 3.8 mm. However, it is preferable that the diameter of the screw hole 14 is larger than the length of the long side 15 and the long hole 16 on the short side side from the point that erroneous insertion in the long hole of the screw does not occur.

  Hereinafter, heat conduction in the bracket 1 to which the present invention is applied will be described.

  As described above, the piston valve 2 controls the movement of high-temperature steam by opening and closing the valve unit 5. Therefore, the inside of the cylinder 3 becomes high temperature, and the heat of the cylinder 3 is transmitted to the bracket 1 via a screw that fixes the bracket 1 to the cylinder 3.

  In the bracket 1, heat is transferred from the cylinder 3 to the portion of the screw hole 14 of the valve side fixing piece 10 that comes into contact with the screw. Further, on the bracket 1, heat moves in the left-right direction from the screw hole 14 toward the connecting pieces 12 at both ends as viewed in FIG. 2, and the side of the sensor-side fixing piece 11 takes the connecting piece 12 as a path. Heat is transmitted to.

  In the sensor side fixing piece 11, heat moves from both end sides toward the central screw hole 17, and finally the heat reaches the vicinity of the proximity sensor 8.

  Here, in the bracket 1, since the central gap 13 is formed, heat transmitted to the main body 9 can be efficiently radiated. Moreover, heat dissipation is further improved by forming each screw hole and long hole.

  In the bracket 1, the two connecting pieces 12 of the main body 9 play a large role in reducing the heat transfer efficiency of the bracket 1. First, the continuous pieces 12 are located at both ends on the main body 9, and in order for heat to move from the screw hole 14 portion to the sensor side fixed piece 11 side, it is necessary to be transmitted to the continuous piece 12 side. is there. Since this moving distance is generated, heat is hardly transmitted.

  In addition, since the width of the continuous piece 12 is as thin as 0.5 mm, the path through which heat is transmitted becomes small, and the heat is more difficult to move to the sensor side fixed piece 11 side. Yes.

  As described above, the 0.5 mm width is not limited to a numerical value, but is set within a range in which the strength of the bracket 1 can be secured. More specifically, it is changed with the numerical value of the length of 6 mm of the continuous piece 12. If this length is doubled, the width of the continuous piece 12 can be doubled. When the length of the continuous piece 12 is doubled, the short side and the long side of the main body 9 can be increased.

  The bracket 1 is made of austenitic stainless steel, and its thermal conductivity is a low value of 15 (W / (m · K)). The numerical value of this thermal conductivity is low carbon steel (thermal conductivity: 57-60 W / (m · K)) or medium carbon steel (thermal conductivity: 44 W / (m), which has been adopted as a material for conventional brackets.・ It is much smaller than K)). Therefore, also in the material, the bracket has a low heat conductivity and a high heat dissipation.

  As described above, the bracket 1 to which the present invention is applied has low heat conduction efficiency toward the sensor side fixing piece 11 and is excellent in heat dissipation.

The flow of detection of ON and OFF in the piston valve 2 to which the bracket 1 described above is attached will be described.
FIG. 3 is a side view (a) showing a state in which the indicator protrudes to the outside of the bulb and a side view (b) showing a state in which the indicator is accommodated inside the bulb. FIG. 4 is a front view (a) showing a state where the indicator protrudes to the outside of the bulb and a front view (b) showing a state where the indicator is housed inside the bulb.

  As shown in FIG. 3A, when the piston (not shown in the figure) is lowered and the valve portion is in the ON state, the indicator 6 is lowered in conjunction with the movement of the piston. A part of the indicator 6 protrudes outside the cylinder 3 through the through hole 7 of the cylinder 3.

  A proximity sensor 8 is attached to the cylinder 3 via the bracket 1 at a portion where the tip of the indicator 6 protrudes. The proximity sensor 8 reacts to the metal indicator 6 and can detect the protruding state without contact with the indicator 6.

  On the other hand, as shown in FIG. 3B, when the piston (not shown in the figure) is raised and the valve portion is turned off, the indicator 6 is raised in conjunction with the movement of the piston. The indicator 6 is located in the through hole 7 of the cylinder 3 and is accommodated in the cylinder 3.

  In this case, since the indicator 6 is not positioned in the vicinity of the proximity sensor 8, the metal body is not detected by the sensor. That is, an undetected state in which the indicator 6 does not protrude is shown.

  FIG. 4A shows a state in which the proximity sensor 8 detects the protrusion of the indicator 6 and the lamp 20 of the proximity sensor 8 is turned on when the valve portion is turned on. Thus, by using lighting of a lamp or the like included in the proximity sensor 8, it is possible to visually confirm a state where the bulb is ON.

  On the other hand, when the bulb is turned off, as shown in FIG. 4B, the lamp 20 of the proximity sensor 8 is not lit and is not detected. That is, since the lamp 20 is not lit, it can be confirmed that the bulb portion is OFF.

Hereinafter, the second embodiment and the third embodiment of the present invention will be described with reference to the drawings to help the understanding of the present invention.
FIG. 5 is a schematic diagram (a) showing a second embodiment of the present invention and a schematic diagram (b) showing a third embodiment of the present invention.

  The bracket 23 according to the second embodiment of the present invention shown in FIG. 5A is a plate-like body in which holes and long holes are formed in a metal main body 24. The difference from the first embodiment is that holes corresponding to the long holes 15, 18 and 19 in the first embodiment are not formed, and the portions corresponding to the connecting pieces 12 are The width is larger than that of the first embodiment. In addition, the width of the central air gap 28 described later (corresponding to the symbol X in FIG. 2) is also smaller than that in the first embodiment.

  The main body 24 has a valve-side fixing piece 25 and a sensor-side fixing piece 26, and has a structure in which these are connected by two connecting pieces 27. The main body 24 is formed with a central gap 28 surrounded by a valve-side fixing piece 25, a sensor-side fixing piece 26 and two connecting pieces 27.

  The valve side fixing piece 25 is formed with a screw hole 29 and a long hole 30. A screw that can be fitted to the diameter of the screw hole 29 is inserted into the screw hole 29, and the screw hole 29 is provided on the side surface of the cylinder 3 of the piston valve 2 and can be fixed to the tap groove. The length on the short side of the long hole 30 is formed to be smaller than the diameter of the screw hole 29.

  The sensor side fixing piece 26 has a screw hole 31 formed therein. The screw hole 31 is tapped so that a screw thread groove can be fixed. Further, the proximity sensor is provided with a hole through which a screw can pass, and in the screw hole 31, the tip of the screw passing through the proximity sensor is fixed.

  Here, the length of the short side of the long hole 30 is not necessarily formed so as to be smaller than the diameter of the screw hole 29. However, it is preferable that the length on the short side of the long hole 30 is made smaller than the diameter of the screw hole 29 from the point that erroneous insertion in the long hole of the screw does not occur.

  Further, the screw hole 31 does not necessarily need to be tapped so that the screw thread groove can be fixed. For example, the screw hole 31 may be a through hole that does not cut a thread groove, and a structure in which the tip of the screw is fixed with a nut may be employed. However, it is preferable that the screw hole 31 is tapped so that the screw thread groove can be fixed, because the number of members required for fixing can be reduced by the amount of nuts not used.

  The main body 24 is made of austenitic stainless steel (SUS304), and its thermal conductivity is 15 (W / (m · K)).

  Here, the elongated hole 30 is not necessarily formed in the valve side fixing piece 25. However, from the point of improving the heat dissipation of the bracket 23, it is preferable that the long hole 30 is formed in the valve side fixing piece 25.

  Further, the main body 24 is not necessarily formed of austenitic stainless steel (SUS304), and any metal material having low thermal conductivity can be adopted. For example, martensitic stainless steel (SUS410) can also be used.

  Subsequently, a third embodiment of the present invention will be described.

  The bracket 32 according to the third embodiment of the present invention shown in FIG. 5B is a plate-like body in which holes and long holes are formed in a metal main body 33. The difference from the first embodiment is that holes corresponding to the long holes 15, 18 and 19 in the first embodiment are not formed, and the portions corresponding to the connecting pieces 12 are The width is larger than that of the first embodiment. In addition, the width of the central gap 37 (corresponding to the symbol X in FIG. 2), which will be described later, is larger than that of the first embodiment. Further, the length on the short side of the main body 33 is larger than the length on the short side of the main body 9.

  The difference between the bracket 32 of the third embodiment and the bracket 23 of the second embodiment is in the width of the central gap and the length of the short side of the main body. That is, the width of the central gap 37 is approximately twice the width of the central gap 28. The length of the short side of the main body 33 is longer than the length of the short side of the main body 24. Thereby, the continuous piece 36 of the third embodiment described later is formed longer than the continuous piece 27 of the second embodiment.

  The main body 33 has a valve-side fixing piece 34 and a sensor-side fixing piece 35, and has a structure in which these are connected by two connecting pieces 36. Further, the main body 33 is formed with a central gap 37 surrounded by the valve side fixing piece 34, the sensor side fixing piece 35 and the two connecting pieces 36.

  The valve side fixing piece 34 is formed with a screw hole 38 and a long hole 39. A screw that can be fitted to the diameter of the screw hole 38 is inserted into the screw hole 38 and is provided on the side surface of the cylinder 3 of the piston valve 2 so that the screw can be fixed to the tap groove. The length of the short side of the long hole 39 is formed to be smaller than the diameter of the screw hole 38.

  The sensor-side fixing piece 35 is formed with a screw hole 40. The screw hole 40 is tapped so that the screw thread groove can be fixed. Further, the proximity sensor is provided with a hole through which the screw can pass. In the screw hole 40, the tip of the screw passing through the proximity sensor is fixed.

  Here, the length on the short side of the long hole 39 is not necessarily formed so as to be smaller than the diameter of the screw hole 38. However, it is preferable that the length on the short side of the long hole 39 is made smaller than the diameter of the screw hole 38 from the point that erroneous insertion in the long hole of the screw does not occur.

  Further, the screw hole 40 does not necessarily have to be tapped so that the screw thread groove can be fixed. For example, the screw hole 40 may be a through hole that does not cut a thread groove, and a structure in which the tip of the screw is fixed with a nut may be employed. However, it is preferable that the screw hole 40 is tapped so that the screw thread groove can be fixed, because the number of members required for fixing can be reduced by using no nut.

  The main body 33 is made of austenitic stainless steel (SUS304), and its thermal conductivity is 15 (W / (m · K)).

  Here, the elongated hole 39 is not necessarily formed in the valve side fixing piece 34. However, from the viewpoint of improving the heat dissipation of the bracket 32, it is preferable that a long hole 39 is formed in the valve side fixing piece.

  In addition, the main body 33 is not necessarily formed of austenitic stainless steel (SUS304), and any metal material having low thermal conductivity can be adopted. For example, martensitic stainless steel (SUS410) can also be used.

  In the second embodiment and the third embodiment of the present invention as described above, the heat conduction efficiency toward the sensor-side fixing piece is achieved by providing a central air gap in the center of the main body of the bracket. Is low and has excellent heat dissipation. Particularly in the third embodiment, it is possible to further reduce the heat conduction efficiency by increasing the width of the central gap.

  Furthermore, as a fourth embodiment of the present invention, a structure in which a long hole is not provided and a central gap is formed may be employed. More specifically, the structure of the bracket 23 shown in the second embodiment of the present invention can be used as a main body without the long hole 30. In the fourth embodiment, since the central gap is provided, the heat conduction efficiency toward the sensor-side fixing piece is low, and the heat dissipation can be improved.

As described above, the piston valve bracket of the present invention is excellent in heat dissipation and durability, and can be stably attached with a proximity sensor for detecting the movement of the piston valve.
In addition, the piston valve bracket fixing structure of the present invention is excellent in heat dissipation and durability, and can be stably attached with a proximity sensor for detecting the movement of the piston valve.

  Examples of the present invention will be described below.

  For Examples 1 to 3 and Comparative Example 1 to which the present invention is applied, a proximity sensor was fixed to the piston valve via the bracket, and temperature measurement was performed with the following contents.

(1) About Examples 1 to 3 and Comparative Example 1 In this example, the bracket 23 according to the second embodiment described above is the example 1, the bracket 32 according to the third embodiment is the example 2, The bracket 1 which is the first embodiment is referred to as Example 3. Further, the bracket 100 described above was used as Comparative Example 1.

(2) Temperature measurement conditions Proximity sensor (sensor type: GX-F8A) that detects opening and closing of the piston valve through the brackets of Examples 1 to 3 and Comparative Example 1 described above on the piston valve that controls high-temperature and high-pressure steam. 1M (manufactured by Panasonic Corporation) was fixed to the piston valve body. The temperature of each bracket mounting portion (corresponding to the screw attached to the screw hole 14 in FIG. 2) and the temperature of the sensor attaching portion (corresponding to the screw attached to the long hole 17 in FIG. 2) were measured. Temperature measurement measured the thermocouple temperature of the object location using the data logger (model | form: ZR-RX40. Made by OMRON Corporation). Operate the piston valve installed in a room temperature atmosphere of 20-28 ° C, control the steam fluid path ON and OFF, control the steam for more than 2 hours, and keep the temperature of the target location in operation Measured. The maximum temperature during the measurement time at the target location was taken as the temperature measurement result.

  Table 1 shows the results of temperature measurement in Examples 1 to 3 and Comparative Example 1. In Table 1, the temperature of the sensor mounting part temperature (2) is a part that affects the heat resistance temperature of the proximity sensor.

  As shown in Table 1, in the brackets of Examples 1 to 3, the sensor mounting part temperature (2) is lowered to a temperature around 70 ° C. and becomes lower than the sensor mounting part temperature (2) of Comparative Example 1. Was confirmed. In particular, in Example 3, the bracket mounting part temperature (1), which is greatly influenced by the temperature on the piston valve side, is as high as 88 ° C., but the sensor mounting part temperature (2) is below 70 ° C. It has become clear that the bracket has low conduction efficiency and high heat dissipation.

DESCRIPTION OF SYMBOLS 1 Bracket 2 Piston valve 3 Cylinder 4 Piston 5 Valve part 6 Indicator 7 Through-hole 8 Proximity sensor 9 Main body 10 Valve side fixed piece 11 Sensor side fixed piece 12 Connection piece 13 Central space 14 Screw hole 15 Long hole 16 Long hole 17 Screw hole 18 Long hole 19 Long hole 20 Lamp 21 Yoke stand 22 Stem 23 Bracket 24 Main body 25 Valve side fixed piece 26 Sensor side fixed piece 27 Continuous piece 28 Central gap 29 Screw hole 30 Long hole 31 Screw hole 32 Bracket 33 Main body 34 Valve side fixing piece 35 Sensor side fixing piece 36 Continuously provided piece 37 Central gap 38 Screw hole 39 Long hole 40 Screw hole

Claims (7)

A first member formed with a first through hole and a long hole having a short side whose length is smaller than the diameter of the first through hole ;
A first projecting piece connected to the end of the first member;
A second projecting piece connected to the end of the first member opposite to the first projecting piece in a direction substantially parallel to and in the same direction as the first projecting piece;
A piston valve comprising: a second member having both ends connected to the first projecting piece and the second projecting piece and having a second through-hole having a thread groove formed on an inner peripheral surface thereof; Bracket for. The second member has a long hole formed
The bracket for piston valves according to claim 1. The first member, the first protruding piece, the second protruding piece, and the second member have thermal conductivity.
30W ・ m ^-1 ・ K ^-1 Made of the following metals
The bracket for piston valves according to claim 1 or 2. The length of the first protruding piece and the second protruding piece in the longitudinal direction is the same as that of the first protruding piece and the second protruding piece.
2 times the length in the width direction of the two protruding pieces
The bracket for piston valves according to claim 3. The thickness of the first member, the first projecting piece, the second projecting piece and the second member is as follows:
It is four times the length in the width direction of the first protruding piece and the second protruding piece.
The bracket for piston valves according to claim 3 or claim 4. The first member, the first protruding piece, the second protruding piece, and the second member are formed of austenitic stainless steel or martensitic stainless steel.
The bracket for a piston valve according to claim 1, claim 2, claim 3, claim 4 or claim 5. The first screw,
A second screw that can be fitted into a predetermined proximity sensor;
A first member formed with a first through-hole into which the first screw can be fitted; a first projecting piece continuously provided at an end of the first member; and the first member. A second projecting piece connected to the end opposite to the first projecting piece substantially in parallel and in the same direction with the first projecting piece, and both ends of the first projecting piece and the first projecting piece. A bracket for a piston valve having a second member which is connected to the two projecting pieces and has a second through hole which is threaded on the inner peripheral surface and can fix the second screw. With
Piston valve bracket fixing structure.