JP2009030696A - Flow control valve - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a flow control valve formed of less number of parts, simply structured, manufacturable at low cost, and having high reliability. <P>SOLUTION: In this flow control valve 1, when a valve stem 15 having a valve element 19 is moved in the axial direction of the valve stem, the valve element approaches and is separated from a valve seat 5a positioned in a valve body 2 for flow control. The flow control valve 1 comprises guide means 15a, 2, 18 for guiding the valve stem in the axial direction while restraining the movement of the valve stem in the direction vertical to the axial direction of the valve stem between two points separated a predetermined distance from each other in the axial direction of the valve stem. Only one O-ring 16 may be attached to surely restrain the movement of the valve stem in the direction vertical to the axial direction while the flow control valve is used. As the quantity of O-rings is reduced, the sliding area between the O-ring and the valve stem can be reduced, and the drive power of the flow control valve can be reduced. When the valve stem is formed in a cylindrical shape, L/D is desirably 1.2 to 5, where the outer diameter of the valve stem is D and the predetermined distance is L. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a flow rate adjusting valve that opens and closes a valve body by an electric motor such as a pulse motor.

  Conventionally, for example, a flow rate adjusting valve as shown in FIG. 4 is used as a hot water valve for adjusting a flow rate by interposing it in a hot water piping system such as a heating device. The flow rate adjusting valve 61 includes a pipe body 63 provided with pipe connection parts 63 and 64, a valve chamber 66 and a holder 68 on the upper part, a pulse motor mounted on the holder 68 via a synthetic resin insulating flange 72, and the like. An electric motor 73, a valve rod 75 mounted in the valve main body 62 and driven by the electric motor 73, a valve body 76 fixed to the lower end of the valve rod 75, and an annular valve seat formed in the valve main body 62 And a valve opening / closing section including 65.

Next, the operation of the flow rate adjustment valve 61 will be described. Water from the supply source of the heating equipment or fluid such as hot water is supplied from the inlet-side flow path 63a, passes through the gap between the valve seat 65 and the valve body 76, and then flows through the valve chamber 66 to the outlet-side flow. It is sent to a device such as a heater through the path 64a. At this time, when the electric motor 73 such as a pulse motor is appropriately rotated by a pulse signal or the like, the rotating shaft 71 of the electric motor 73 rotates and the driving shaft 69 engaged with the rotating shaft 71 is rotated. The rotation of the drive shaft 69 causes the drive shaft 69 itself to move up and down, thereby moving the valve rod 75 up and down. The valve stem 75 moves in the vertical direction by an amount proportional to the amount of the pulse signal, adjusts the gap width between the valve seat 65 and the lower part of the valve body 76, and adjusts the flow rate of the fluid flowing through the gap. .
JP 2005-325887 A

  However, the conventional flow rate adjusting valve has a large number of parts and a complicated structure such that three O-rings 78 to 80 are used or the valve main body 62 and the holder 68 are connected using a lock nut 81. Therefore, there is room for improvement in manufacturing cost and device reliability.

  Therefore, the present invention has been made in view of the problems in the conventional flow rate regulating valve, and has a reduced manufacturing cost and a high device reliability by reducing the number of parts and simplifying the structure. It aims at providing a flow regulating valve.

  In order to achieve the above object, according to the present invention, a valve stem having a valve body moves in the axial direction of the valve stem so that the valve body comes into contact with and separates from a valve seat located inside the valve body. A flow regulating valve that regulates the flow rate of the valve stem while restricting movement in a direction perpendicular to the axial direction of the valve stem between two points that are separated by a predetermined distance in the axial direction of the valve stem. Guide means for guiding in the axial direction of the rod is provided.

  And according to the present invention, the guiding means regulates the movement of the valve stem in a direction perpendicular to the axial direction of the valve stem between two points separated by a predetermined distance in the axial direction of the valve stem. Since the valve stem can be guided in the axial direction, the movement of the valve stem in a direction perpendicular to the axial direction of the valve stem can be reliably restricted during use of the flow regulating valve. A plurality of O-rings that have been conventionally used to regulate the above can be made into one. Further, as the number of O-rings is decreased, the sliding area between the O-ring and the valve stem can be reduced, so that the driving power of the flow rate adjusting valve can also be reduced.

  In the flow regulating valve, the guide means includes an annular protrusion protruding in a direction perpendicular to the axial direction of the valve stem at an end different from the end of the valve stem having the valve body, and the annular protrusion A first guide portion comprising an inner peripheral surface that slides in contact with the outer peripheral surface of the portion and guides the valve stem in the axial direction; and an axial direction in which the valve stem is slid in contact with the outer peripheral surface of the intermediate portion of the valve stem. And a second guide part having an inner peripheral surface for guiding the outer peripheral surface of the annular guide part of the first guide part and the inner peripheral surface of the second guide part arranged at a predetermined distance from each other. Can be configured. According to this structure, a part of guide means can be comprised using a valve stem.

  Further, in the flow rate adjusting valve, the guide means has an inner peripheral surface that slides on the outer peripheral surface of the valve rod and guides the valve rod in the axial direction, and the shaft of the valve rod on the inner peripheral surface is provided. The length in the direction can be the predetermined distance. According to this, the guide means can be configured to be, for example, a ring-shaped member and fixed to the valve body or the like.

  Furthermore, in the flow rate adjusting valve, when the valve stem is formed in a cylindrical shape, the outer diameter of the valve stem is D, and the predetermined distance is L, L / D is 1.2 or more and 5 or less. be able to. If L / D is less than 1.2, it is not easy to restrict the movement of the valve stem in the direction perpendicular to the axial direction. On the other hand, when L / D exceeds 5, it is necessary to increase the length of the valve stem.

  Further, in the flow rate adjusting valve, a screw mechanism that contacts the valve stem and moves the valve stem in the axial direction can be provided, and a female screw portion constituting the screw mechanism can be integrally formed on the valve body. Thereby, it is not necessary to separately form the member having the female screw portion and the valve main body, and the number of parts of the flow rate adjusting valve can be reduced.

  Furthermore, in the flow rate adjusting valve, the valve main body includes a flange portion for fixing the flow rate adjusting valve to the mounting portion, and a holder portion for accommodating the drive mechanism of the flow rate adjusting valve, the flange portion and the holder The part can be formed integrally with the valve body. By forming the holder part and the flange part integrally with the valve body, the number of parts of the flow rate adjusting valve can be reduced.

  Further, in the flow rate adjusting valve, the valve seat member including the valve seat can be separated from the valve body. Thereby, it can respond easily to various uses by combining a valve main body as a common component, and a valve seat member which has a different valve seat opening area.

  As described above, according to the present invention, it is possible to provide a flow regulating valve with a small number of parts, a simple structure, low manufacturing cost, and high device reliability.

  Next, embodiments of the present invention will be described with reference to the drawings.

  FIG. 1 shows a first embodiment of a flow rate adjusting valve according to the present invention. This flow rate adjusting valve 1 is composed of pipe connecting portions 3 and 4, a valve chamber 6, a drive shaft 8 and the like. A valve main body 2 having a holder portion 2b for accommodating a drive mechanism, an electric motor 14 such as a pulse motor mounted and fixed via a flange 11 on the upper portion of the valve main body 2, and an electric motor 14 mounted in the valve main body 2 A valve stem 15 to be driven, a valve body 19 fixed to the lower end of the valve stem 15, a valve seat member 5 fixed to an opening of the valve chamber 6 on the pipe connection portion 3 side and including an annular valve seat 5 a Is provided. In the flow rate adjusting valve 1, the flange 11 is fixed to a mounting portion 12 having a rectangular shape when viewed from above using a rivet 13 or the like.

  The valve body 2 is made of, for example, a material such as brass, and includes a flange 11 on the upper portion. An electric motor 14 such as a pulse motor is placed and fixed on the flange 11. The valve body 2 is provided with pipe connection portions 3 and 4 so as to be substantially perpendicular to each other, and is connected to the inlet side flow passage 3a of the pipe connection portion 3 and the inlet side flow passage 4a of the pipe connection portion 4. A chamber 6 is formed inside the valve body 2. The upper portion of the valve chamber 6 is closed by an O-ring 16 and a stainless steel ring 18. A valve body 19 is disposed in the valve chamber 6, and the valve body 19 is attached and fixed to a valve stem 15 that is slidably supported in the upper opening of the valve body 2.

  An intermediate portion of the valve stem 15 is slidably supported by the valve body 2 via an O-ring 16 and a stainless steel ring 18, and the upper end of the valve stem 15 is expanded in diameter to form an annular protrusion 15a. Yes. A concave portion 15 b is formed in the ceiling portion of the valve stem 15, and the lower end portion of the drive shaft 8 is in contact with the concave portion 15 b via the rigid sphere 20, and the upper end portion of the drive shaft 8 is connected to the electric motor 14. Is engaged with the rotary shaft 9. The drive shaft 8 is screwed with a male screw portion 8 a and is screwed into the female screw portion 10 a of the drive shaft guide member 10 fixed in the upper space of the valve body 2. A coil spring 17 is stretched between the annular protrusion 15a of the valve stem 15 and the bottom surface of the upper space of the valve body 2, and always biases the valve stem 15 upward.

  The valve seat member 5 is fixed to the pipe connecting portion 3 side of the valve chamber 6, and the annular valve seat 5 a of the valve seat member 5 has, for example, a semicircular cross-sectional shape, and the valve member 19 a of the valve body 19. Touch and separate.

  The valve stem 15 includes a shaft end portion 15c for fixing the valve body 19 at a lower portion. The valve body 19 includes a valve member 19a that contacts and closes the valve seat 5a, an outer collar 19b that holds the valve member 19a, and an inner collar 19b. A collar 19c is provided. The valve member 19a and the collars 19b and 19c are fixed to the valve stem 15 by fitting the shaft end portion 15c of the valve stem 15 to the center thereof and caulking the end of the shaft end portion 15c, for example. .

  The valve member 19a of the valve body 19 is formed in a ring shape from a synthetic resin such as a rubber material or a fluorine resin, and the outer collar 19b and the inner collar 19c are formed of stainless steel or the like. The valve member 19a is sandwiched between the inner periphery of the outer collar 19b and the outer periphery of the inner collar 19c.

  Next, the operation of the flow rate adjusting valve 1 will be described. Water from the supply source of the heating device or fluid such as hot water is supplied from the inlet-side flow path 3a and passes through the gap between the annular valve seat 5a and the valve member 19a of the valve body 19, and then the valve chamber 6 Through the outlet side flow path 4a and sent to a device such as a heater. At this time, when the electric motor 14 such as a pulse motor is appropriately rotated by a pulse signal or the like, the rotating shaft 9 of the electric motor 14 rotates and the driving shaft 8 screwed with the rotating shaft 9 is rotated. The rotation of the drive shaft 8 causes the drive shaft 8 itself to move in the vertical direction, thereby moving the valve stem 15 up and down. The valve stem 15 moves up and down by an amount proportional to the amount of the pulse signal, adjusts the gap width between the valve seat 5a and the valve member 19a, and adjusts the flow rate of the fluid flowing through the gap.

  As described above, in the flow rate adjusting valve 1, the annular protrusion 15 a of the valve rod 15 and the inner wall of the upper space of the valve body 2 constitute an upper guide portion, and face the valve chamber 6 of the valve body 2. Since the stainless steel ring 18 is disposed in the portion as a lower guide portion, these two guide portions can be guided in the axial direction while restricting the movement of the valve stem 15 in the direction perpendicular to the axial direction. During use of the regulating valve 1, the movement of the valve stem 15 in the direction perpendicular to the axial direction can be reliably restricted. As a result, two O-rings 79 and 80 used in the conventional flow rate adjusting valve 61 (see FIG. 4) can be made one (O-ring 16). Further, in the flow rate adjusting valve 1, since the stainless steel ring 18 is disposed so as to face the valve chamber 6, dezincification corrosion in which zinc contained in the brass is separated from the brass does not occur.

  Next, a second embodiment of the flow regulating valve according to the present invention will be described with reference to FIG.

  The flow rate adjusting valve 21 uses a guide member 38 instead of the annular protrusion 15a of the valve stem 15 and the stainless steel ring 18 used as the guide means in the flow rate adjusting valve 1. In addition, since components other than the valve stem 35 and the guide member 38 in the present embodiment have the same configuration as in FIG. 1, the same reference numerals as those in FIG.

  An intermediate portion of the valve stem 35 is slidably supported by the valve body 2 via the O-ring 16 and the guide portion 38, and the upper end of the valve stem 35 is expanded in diameter to form a flange portion 35a. A concave portion 35 b is formed in the ceiling portion of the valve rod 35, and the lower end portion of the drive shaft 8 is in contact with the concave portion 35 b through the rigid sphere 20. A coil spring 17 is stretched between the flange portion 35a and the bottom surface of the upper space of the valve body 2 to constantly bias the valve rod 35 upward.

  The valve stem 35 includes a shaft end portion 35c for fixing the valve body 19 at a lower portion thereof. The valve body 19 includes a valve member 19a that contacts the valve seat 5a to close the valve, and an outer collar that holds the valve member 19a. 19b and an inner collar 19c. The valve member 19a and the collars 19b and 19c are fixed to the valve rod 35 by fitting the shaft end portion 35c of the valve rod 35 to the center thereof and caulking the end of the shaft end portion 35c, for example.

  The guide member 38 is formed in a disk shape having an upper part in a cylindrical shape and a lower part in an opening, and a lower end portion of the coil spring 17 is in contact with an upper surface of the disk-like lower part. The guide member 38 is fixed to the bottom surface of the upper opening of the valve main body 2, and is guided by inserting the valve rod 35 through the through hole of the guide portion 38. A through hole 2 a that penetrates the valve body 2 in the vertical direction is provided below the guide member 38.

  The operation of the flow rate adjusting valve 21 is the same as that of the flow rate adjusting valve 1 shown in FIG. 1 and will not be described. In the present embodiment, only the guide member 38 constitutes the guide means for the valve rod 35. Therefore, the flange 35a of the valve stem 35 does not slide on the inner peripheral surface of the upper opening of the valve body 2, and is used only for the purpose of tensioning the coil spring 17. Moreover, in this Embodiment, the stainless steel ring 18 in the flow regulating valve 1 becomes unnecessary. Also in the flow regulating valve 21, since the O-ring 16 only faces the valve chamber 6 through the through hole 2a in the periphery of the valve rod 35, the sticking of the valve rod 34 due to dezincification corrosion can be prevented. .

  Next, a third embodiment of the flow regulating valve according to the present invention will be described with reference to FIG.

  This flow rate adjusting valve 41 does not use the drive shaft guide member 10 having the female screw portion 10a of the flow rate adjusting valve 1 shown in FIG. Instead of 8, there is a feature in that a drive shaft 48 in which a male screw portion 48a is screwed on an enlarged upper portion is used. In addition, since it has the structure similar to FIG. 1 about components other than the internal thread part 42a and the drive shaft 48 of the valve main body 42, the same reference number as FIG. 1 is attached | subjected and detailed description is abbreviate | omitted.

  In the present embodiment, as described above, the drive shaft guide member 10 used in the flow rate adjusting valve 1 in FIG. 1 is not required, so the number of parts can be further reduced, and the manufacturing cost of the flow rate adjusting valve can be reduced. Can be reduced. In addition to this, as the internal thread 42a is screwed into the valve body 42, the entire valve body 42 is plated with Ni-P / PTFE or the like to ensure slidability between the internal thread 42a and the external thread 48a. At the same time, it is possible to prevent parts such as brass from being exposed and to prevent dezincing corrosion.

  In each of the embodiments described above, the outer diameter of the columnar valve stems 15 and 35 is D, the distance between the annular projection 15a of the valve stem 15 and the stainless steel ring 18 in FIG. 1 is L1, and the guide in FIG. When the height of the member 38 is L2, L1 / D and L2 / D are preferably 1.2 or more and 5 or less. If L1 / D and L2 / D are less than 1.2, it is not easy to restrict the movement of the valve stems 15 and 35 in the direction perpendicular to the axial direction. On the other hand, if L / D exceeds 5, the lengths of the valve rods 15 and 35 need to be increased, which is not preferable because the flow rate adjusting valves 1 and 21 themselves are enlarged.

  In each of the above embodiments, since the valve seat member 5 is configured as a separate part from the valve body 2, even when the flow range to be controlled is different, the valve body 2 is used as a common part and the flow rate to be controlled. By selecting the valve seat member 5 having a different valve seat opening area according to the range, it is possible to easily cope with the problem.

It is a whole sectional view showing a 1st embodiment of a flow regulating valve concerning the present invention. It is a whole sectional view showing a 2nd embodiment of a flow regulating valve concerning the present invention. It is a whole sectional view showing a 3rd embodiment of a flow regulating valve concerning the present invention. It is a whole sectional view showing an example of the conventional flow control valve.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Flow control valve 2 Valve body 2a Through-hole 2b Holder part 3 Piping connection part 3a Inlet side flow path 4 Piping connection part 4a Outlet side flow path 5 Valve seat member 5a Valve seat 6 Valve chamber 8 Drive shaft 8a Male thread part 9 Rotating shaft DESCRIPTION OF SYMBOLS 10 Drive shaft guide member 10a Female thread part 11 Flange 12 Mounting part 13 Rivet 14 Electric motor 15 Valve rod 15a Annular projection part 15b Recessed part 15c Shaft end part 16 O-ring 17 Coil spring 18 Stainless steel ring 19 Valve body 19a Valve member 19b Outer collar 19c Inner collar 20 Rigid sphere 21 Flow rate adjusting valve 35 Valve rod 35a Fence 35b Concave portion 35c Shaft end 38 Guide member 41 Flow rate adjusting valve 42 Valve body 42a Female thread part 48 Drive shaft 48a Male thread part

Claims (7)

In the flow rate adjustment valve that adjusts the flow rate by moving the valve stem having a valve body in the axial direction of the valve stem so that the valve body comes in contact with and separates from the valve seat located inside the valve body.
Guiding means for guiding the valve stem in the axial direction of the valve stem while restricting movement of the valve stem in a direction perpendicular to the axial direction between two points separated by a predetermined distance in the axial direction of the valve stem. A flow rate adjusting valve comprising:   The guide means includes an annular projection that projects in a direction perpendicular to the axial direction of the valve stem at an end different from the end of the valve stem that has the valve body, and an outer peripheral surface of the annular projection. An inner peripheral surface that is in sliding contact with the outer peripheral surface of the intermediate portion of the valve rod and guides the valve rod in the axial direction by being in contact with the inner peripheral surface that guides the valve rod in the axial direction. The outer peripheral surface of the annular protrusion of the first guide portion and the inner peripheral surface of the second guide portion are arranged at a predetermined distance from each other. The flow regulating valve according to claim 1.   The guide means has an inner peripheral surface that slides in contact with the outer peripheral surface of the valve stem and guides the valve stem in the axial direction, and sets the length of the inner peripheral surface in the axial direction of the valve stem to the predetermined length. The flow regulating valve according to claim 1, wherein the flow regulating valve is a distance.   The valve stem is formed in a cylindrical shape, and L / D is 1.2 or more and 5 or less, where D is an outer diameter of the valve stem and L is the predetermined distance. 2. The flow regulating valve according to 2 or 3.   A screw mechanism that abuts on the valve stem and moves the valve stem in an axial direction of the valve stem is provided, and a female thread portion that constitutes the screw mechanism is integrally formed on the valve body. Item 5. The flow regulating valve according to any one of Items 1 to 4.   The valve body includes a flange portion for fixing the flow rate adjusting valve to the mounting portion, and a holder portion that accommodates the drive mechanism of the flow rate adjusting valve, and the flange portion and the holder portion are integrally formed with the valve body. The flow regulating valve according to any one of claims 1 to 5, wherein   The flow regulating valve according to claim 1, wherein a valve seat member including the valve seat is separate from the valve main body.

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