JP2009174690A - Valve body structure for valve device and its manufacturing method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a valve body structure for a valve device and its manufacturing method, capable of integrating an inner machine part which is a metallic part and a resin valve body by a simple and inexpensive process, by using ultrasonic welding of mutual resins. <P>SOLUTION: A valve seat member 5 is constituted by forming a resin layer 31 in advance by insert molding on the outside of a metallic annular valve seat 30 for providing an annular valve seat 5a. The resin layer 31 is desirably made of the same resin as the valve body 2. While applying ultrasonic vibration generated by an ultrasonic hone to the valve seat 30, the valve seat member 5 is pushed in a pipe connecting part 3 of the valve body 2, so that a resin part dimensionally overlapping with the resin layer 31 and the valve body 2 is melted by frictional heat and is integrated in cooling. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a valve body structure for a valve device as a composite part formed by joining a metal part and a resin part, and a method for manufacturing the same.

  Conventionally, in the case of joining metal parts as a joining for integrating parts, a technique of press-fitting one part into the other part is often used. In the case of an integral connection between a metal part and a resin part, an insert molding method is used in which the metal part is integrated with the resin when the resin is cured by placing the metal in a mold and pouring the resin around it. It has been.

  There is a technique of inserting after assembling the parts to be included. In this method, the outer shape of the metal part is made larger than the inner diameter of the resin part, the metal part is vibrated, and the metal part is placed in the resin part while melting the resin where the diameter overlaps. And combine. This technique is also called insert molding in a broad sense. This approach has the disadvantage that the molten resin must be contained somewhere. In addition, this method has a problem that the position accuracy must be relied on a jig. When such a manufacturing method is applied to, for example, the manufacture of a valve, a phenomenon in which molten resin jumps out as a burr occurs, which may cause valve leakage or a seal failure. There is also a problem that it is difficult to obtain positional accuracy (lateral direction).

As a temperature-type expansion valve, the throttle mechanism is controlled in accordance with the temperature of the valve body, the orifice, the valve body, and the operating rod for operating the valve body, and the refrigerant sent from the evaporator toward the compressor. There is proposed a control mechanism, in which an orifice formed of a metal member is fixed to a valve body formed of resin by insert molding (see Patent Document 1).
Further, by defining a valve hole in the metal valve seat member and providing a cylindrical part formed with a male screw on the outer peripheral surface, and screwing the cylindrical part into a valve hole pilot hole formed in the housing body made of synthetic resin, There has been proposed a temperature expansion valve that is intended to fix the position of the valve seat member to the housing body after the molding is completed with higher precision than in the case of insert molding without complicating the molding structure of the housing body. (See Patent Document 2).
JP 09-089154 A JP 11-325308 A

  For example, for a valve with a valve seat (valve seat) that contacts and separates, such as a flow control valve, if the valve seat is made of resin, depending on the fluid to be handled, it tends to be subject to erosion and corrosion. Since it is soft when made, it wears due to repeated contact and separation of the valve body. Therefore, the valve seat is required to be made of metal. In addition, a feed screw mechanism is used as a means for driving the valve body. However, if the screw part is made of resin, it may be worn out, resulting in deterioration of operation and controllability of the flow rate due to wear. It is hoped that. When a metal screw is first placed in a mold and molded with resin, if the outer diameter of the internal parts such as a valve stem or coil is larger than the inner diameter of the threaded part, the parts such as male screws and springs that make up the screw moving mechanism It becomes difficult to incorporate later.

  Therefore, in the valve body structure for the valve device and the manufacture thereof, the valve body structure for the valve device as an integrated composite part is obtained by combining the internal part that is a metal part and the valve body that is a resin part. Therefore, there is a problem to be solved in terms of devising a technique that can utilize ultrasonic welding between resins, instead of directly integrating the internal parts and the valve body.

  An object of the present invention is for a valve device that can integrate an internal machine component, which is a metal component, and a valve body, which is a resin component, with a simple and inexpensive process by utilizing ultrasonic welding between resins. It is providing the valve main body structure and its manufacturing method.

  In order to solve the above-described problems, a method for manufacturing a valve body structure for a valve device according to the present invention includes forming a resin layer in advance at a site where the internal machine component is to be joined to the valve body, and the resin layer and the valve It is characterized in that the main body is joined by ultrasonic welding.

  In the valve body structure for a valve device according to the present invention, the inner machine part and the valve body are joined by ultrasonic welding of a resin layer formed on the inner machine part to the valve body. It is characterized by being.

  According to the valve main body structure for the valve device and the manufacturing method thereof, the resin layer is formed in advance on the inner machine part, which is a metal part, by a technique such as insert molding. The inner part with the resin layer thus manufactured is attached to the valve body, which is a resin part, using the ultrasonic welding, which is a conventional resin-to-resin bonding method, as it is. By coupling, the valve body and the internal parts are coupled.

  Since the valve body structure for a valve device and the manufacturing method thereof according to the present invention are configured as described above, the conventional ultrasonic welding technique that can be applied to resins is used as it is, and is a metal part. It is possible to weld and integrate the resin layer provided on the internal machine parts and the valve body which is a resin part. As a result, the valve body structure for the valve device in which the internal machine parts are coupled to the valve body is obtained. Obtainable. As a manufacturing method, such a valve body structure can be manufactured at a low cost by a simple process of welding resins together.

  Hereinafter, embodiments of a valve body structure for a valve device and a manufacturing method thereof according to the present invention will be described with reference to the accompanying drawings. FIG. 1 is a longitudinal sectional view showing an example of a flow regulating valve to which a valve body structure according to the present invention is applied.

  A flow rate adjustment valve 1 shown in FIG. 1 is a hot water valve that is interposed in the middle of a hot water piping system such as a heating device and performs flow rate adjustment, and includes a holder portion 2b that houses a drive mechanism including a drive shaft 8 and the like. The valve body 2, pipe connection parts 3, 4 provided so as to be substantially perpendicular to the valve body 2, and an electric motor 14 such as a pulse motor mounted and fixed via a flange 11 at the top of the valve body 2. I have. The flow rate adjusting valve 1 is fixed to the mounting portion 12 having a rectangular shape in a top view by using a rivet 13 or the like in the flange 11.

  Inside the valve body 2, a valve chamber 6 is formed so as to communicate with the inlet-side flow path 3 a of the pipe connection portion 3 and the inlet-side flow path 4 a of the pipe connection portion 4. The flow regulating valve 1 is further slidably supported in the upper opening of the valve body 2 and is driven by an electric motor 14. A valve body 19 is fixed to the lower end of the valve stem 15. And a valve seat member 5 including an annular valve seat 5a which is fixed to the opening of the valve main body 2 on the pipe connection portion 3 side. The upper portion of the valve chamber 6 is closed by an O-ring 16 and a ring 18. The ring 18 is made of resin and is fixed to the valve body 2 by ultrasonic welding.

  An intermediate portion of the valve stem 15 is slidably supported on the valve body 2 via an O-ring 16 and a ring 18, and the upper end of the valve stem 15 is expanded in diameter to form an annular protrusion 15a. 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 through the rigid sphere 20, and the upper end portion of the drive shaft 8 is connected to the electric motor 14. The rotating shaft 9 is engaged. The drive shaft 8 is screwed with a male screw portion 8 a and is screwed into a 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 mounted in a compressed state 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 stem 15 is provided with a shaft end portion 15c for fixing the valve body 19 at a lower portion. The valve body 19 is formed in a ring shape with a rubber material, a synthetic resin such as a fluororesin, or a metal such as SUS. It has the valve member 19a which can close a valve when it contacts 5a.

  Next, the operation of the flow rate adjusting valve 1 will be described. Water from the supply source of the heating equipment or fluid such as hot water is supplied from the inlet-side passage 3a, passes through the gap between the annular valve seat 5a and the valve member 19a of the valve body 19, and then passes through 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 based on a rotation control signal such as a pulse signal, the rotating shaft of the electric motor 14 rotates and the drive shaft 8 screwed with the rotating shaft 9 rotates. . The drive shaft 8 itself moves up and down due to its rotation, and moves the valve rod 15 up and down via the rigid sphere 20. The valve stem 15 moves up and down by an amount proportional to the control amount of the rotation control signal, adjusts the gap width between the valve seat 15a and the valve member 19a, and adjusts the flow rate of the fluid flowing through this gap. .

  In the flow control valve 1 described above, the valve body 2 and the valve seat member 5 fixed thereto, and the valve body 2 and the drive shaft guide member 10 coupled thereto correspond to the valve body structure according to the present invention. To do. The valve seat member 5 and the drive shaft guide member 10 are internal parts in the flow control valve 1. The valve body 2 and the valve seat member 5 coupled thereto, or the valve body 2 and the drive shaft guide member 10 coupled thereto are configured as composite parts in which metal parts and resin parts are integrated.

  2 and 3 are views for explaining an embodiment of a manufacturing method in which a valve seat member 5 which is a metal part of the flow control valve 1 shown in FIG. 1 is coupled to a resin valve body 2. FIG. 3A is an enlarged cross-sectional view of a main part showing a state before joining, and FIG. 2B is an enlarged cross-sectional view showing a state after joining. As shown in FIG. 2, before assembling the valve body 2, the valve seat member 5 is resin-molded by insert molding on the outside of a metal annular valve seat 30 providing an annular valve seat. The layer 31 is formed in advance. The resin layer 31 is preferably made of the same resin as the valve body 2. In this embodiment, the pipe connecting portion 3 of the valve body 2 is formed with two step portions 32 and 33 whose inner diameter is enlarged with respect to the outer side. Correspondingly, the valve seat member 5 is also a valve. The outer diameter of the end portion far from the chamber 6 is widened. The two-stepped portion is not an essential structure and may be formed in a stepped portion having a single-step end as shown in FIG. 4 as will be described later.

  The resin material constituting the valve body 2 and the resin layer 31 can be a component made of PPS (polyphenylene sulfide resin) or SPS (syndiotactic polystyrene resin). Moreover, as a metal component which comprises the valve seat 30, it can be made by plating stainless steel or brass. As the resin layer applied to the metal part, such a metal can be coated with the above PPS or SPS resin.

  As shown in FIG. 3, regarding the outer shape of the valve seat 30 covered with the resin layer 31, the diameter of the cylindrical surface side surface 31 b of the resin layer 31 in the small diameter portion 5 b due to the step structure is the step portion 32 in the valve body 2. Further, it is set to be equal to the diameter of the cylindrical inner peripheral surface 32 b continuous with the valve chamber 6 on the far side. In addition, the diameter of the cylindrical side surface 31c of the resin layer 31 in the large-diameter portion 5c by the step structure is a cylindrical inner peripheral surface formed between the step portion 32 and the step 33 in the valve body 2. It is set equal to the diameter of 32c. Therefore, the side surfaces 31b and 31c serve as guide surfaces of the valve seat 30 with respect to the valve body 2 in cooperation with the inner peripheral surfaces 32b and 32c. When the valve seat member 5 is inserted into the valve main body 2 from the opening end side facing the pipe connection portion 3 and pushed into the valve body 2, the valve seat member 5 is moved by the guide surfaces in the two regions spaced in the pushing direction. Guided. This guide is ensured before and after the subsequent ultrasonic welding, and the radial deflection of the valve seat member 5 with respect to the valve body 2 is extremely reduced, and positioning can be performed accurately.

  In the step portion 32 of the valve body 2, a step surface 32a that intersects the inner peripheral surface 32b at a right angle and expands in an annular shape in the radial direction and a tapered surface 32d that connects the step surface 32a to the inner peripheral surface 32c are formed. Yes. On the other hand, in the valve seat member 5, the resin layer 31 is an end surface 31a that intersects the small diameter portion 5b and the large diameter portion 5c at a right angle, and a portion that is previously retracted corresponding to the tapered surface 32d is formed. Absent. Therefore, when the valve seat member 5 is pushed into the valve main body 2 and placed at a predetermined coupling position, overlapping portions 31e and 32e are generated at the corner portions of the resin layer 31 and the step portion 32.

  When the valve seat member 5 is inserted from the opening side of the pipe connecting portion 3 and the side surfaces 31b and 31c, which are guide surfaces, are pushed into the inner peripheral surfaces 32b and 32c of the valve body 2 while being pushed in, the corner portions of the resin layer 31 are formed. It abuts against the tapered surface portion 32d of the stepped portion 32 at the overlapping portion 31a. An ultrasonic horn is applied to the valve seat member 5 (from below in the state shown in the figure), and the ultrasonic vibration generated by the ultrasonic horn in that state is applied to the valve seat 30, while the valve seat member 5 is further moved to the valve body. Push into 2. At this time, overlapping portions 31e and 32e between the resin layer 31 and the valve body 2 are melted and melted by frictional heat. Excess molten resin flows in a gap formed slightly between the valve seat member 5 and the valve body 2. The pushing of the valve seat member 5 into the pipe connecting portion 3 is limited by the contact of the end surface 31a of the valve seat member 5 with the stepped surface 32a of the valve body 2, and the pushing position is the pipe connecting portion 3 of the valve seat member 5. The valve seat member 5 and the valve body 2 are integrated when the resin is cooled. As described above, the valve seat member 5 moves in the radial direction and the pushing direction with respect to the valve body 2 by the guide by the side surfaces 31b and 31c and the inner peripheral surfaces 32b and 32c and the contact between the end surface 31a and the step surface 32a. Positioning is performed with high accuracy.

  FIG. 4 shows another embodiment of the valve body structure according to the present invention, which is similar to the valve seat portion of FIG. That is, in the embodiment shown in FIGS. 2 and 3, the two-stage steps 32 and 33 are formed in the pipe connection portion 3, but in the embodiment shown in FIG. Correspondingly, the valve seat member 35 is also formed in a straight cylindrical shape. By making the diameter of the inner peripheral surface of the valve body 2 the same as the outer diameter of the resin layer 37 of the valve seat member 35, the valve seat member 35 is guided when being pushed into the valve body 2 (pipe connection portion 3). Is done. The structure for obtaining the coupling is the same as the structure shown in FIG. 3 and will not be described in detail. However, when contacting the corner of the stepped portion 36 and the corner of the valve seat member 35 on the valve body 2 side, An overlapping portion is provided, and the valve body 2 and the valve seat member 35 can be joined by welding at the overlapping portion.

  5 and 6 are diagrams illustrating another embodiment of a manufacturing method in which the drive shaft guide member 10 that is a metal part of the flow control valve 1 shown in FIG. 1 is coupled to the resin valve body 2. FIG. 6A is an enlarged cross-sectional view of a main part showing a state before joining, and FIG. 6B is an enlarged cross-sectional view showing a state after joining. As shown in FIG. 5, the drive shaft guide member 10 has a resin layer 41 formed in advance on an outer peripheral side of a metal female screw body 40 before assembly to the valve body 2. It is configured. The resin layer 41 is preferably made of the same resin as the valve body 2. The holder part 2b of the valve body 2 is formed with stepped parts 42 and 43 whose inner diameter is enlarged with respect to the outside. It is the step 42 that is used for the coupling. After coupling the drive shaft guide member 10 to the valve body 2, the drive shaft 8 having the male screw portion 8 a is screwed to the female screw body 40.

  Since the outer diameter dimension of the female screw body 40 provided with the resin layer 41 is formed to be the same as the diameter of the inner peripheral surface 42b between the step portions 42 and 43 of the valve body 2, the side face 41b of the female screw body 40 is formed. Is a guide surface when the female screw body 40 is pushed into the valve body 2 in the same manner as the inner peripheral surface 42b. A stepped surface 42 a and a tapered surface 42 d are formed at the corners of the stepped portion 42 of the valve body 2. On the other hand, the resin layer 41 of the female screw body 40 has a straight shape and is not formed with a preliminary relief corresponding to the tapered surface 42d. Therefore, when the drive shaft guide member 10 is inserted from the opening end side facing the holder 2 b, the corner of the resin layer 41 abuts against the corner of the step 42.

  The procedure for obtaining the bond is the same as the structure shown in FIG. 3 or FIG. That is, there are provided overlapping portions 41e, 42e that overlap each other at the corner of the step 42 on the valve body 2 side and the corner of the drive shaft guide member 10. An ultrasonic horn is applied to the female female screw body 40 (from above in the state shown in the figure), and the ultrasonic shaft generated by the ultrasonic horn is applied to the female screw body 40 while the drive shaft guide member 10 is moved to the valve body 2. When the resin is pushed into the holder 2b, the resin in the overlapping portions 41e and 42e that overlap in dimension between the resin layer 41 and the valve body 2 is melted and melted by frictional heat. The pushing of the drive shaft guide member 10 into the valve body 2 is limited by pushing until the end surface 41a and the stepped surface 42a come into contact with each other, and the push position is set as a fixed position in the holder 2b of the drive shaft guide member 10. The When the molten resin is solidified by cooling, the drive shaft guide member 10 is coupled to the valve body 2 by welding at the overlapping portions 41e and 42e.

  As described above, the drive shaft guide member 10 is highly accurate in both the radial direction and the pushing direction with respect to the valve body 2 by the guide by the side surface 41b and the inner peripheral surface 42b and the contact of the end surface 41a and the stepped surface 42a. Positioning is done. In addition, a resin layer is formed in advance on the metal drive shaft guide member, and the resin layer and the valve body made of resin are joined by ultrasonic welding by melting and solidifying the resin, so that the process is simple and inexpensive. A valve body structure for a valve device can be obtained.

It is a longitudinal cross-sectional view which shows an example of the flow regulating valve to which the valve main body structure for the valve apparatus by this invention is applied. It is a figure explaining one Embodiment of the manufacturing method which couple | bonds the valve seat member which is a metal component of the flow control valve shown in FIG. 1 with the resin-made valve main body. It is an expanded sectional view of the principal part which each shows before and after the coupling | bonding to the valve main body of the valve seat member of the flow control valve shown in FIG. It is a longitudinal cross-sectional view which shows another embodiment of the valve body structure by this invention. It is a figure explaining one Embodiment of the manufacturing method which couple | bonds the drive-shaft guide member which is a metal component of the flow regulating valve shown by FIG. 1 with the valve body made from resin. It is an expanded sectional view of the principal part which shows each before and after the coupling | bonding to the valve main body of the drive shaft guide member of the flow control valve shown in FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Flow control valve 2 Valve main body 3,4 Piping connection part 5 Valve seat member 5a Valve seat 5b Small diameter part 5c Large diameter part 6 Valve chamber 8 Drive shaft 8a Male thread part 9 Rotating shaft 10 Drive shaft guide member 10a Female thread part 14 Electric motor 15 Valve rod 19 Valve body 19a Valve member 30 Valve seat 31 Resin layer 31a End surface 31b, 31c Side surface 31e Overlapping portion 32,33 Stepped portion 32a Stepped surface 32b Inner circumferential surface 32c Inner circumferential surface 32d Tapered surface 32e Overlapped portion 36 Stepped portion 37 Resin Layer 40 Female thread body 41 Resin layer 41b Side surface 42, 43 Stepped portion 42a Stepped surface 42a 42b Inner peripheral surface 42d Tapered surface

Claims (12)

In the valve body structure for a valve device formed by combining an internal machine part that is a metal part and a resin valve body,
The valve body structure for a valve device, wherein the inner machine component and the valve body are joined by ultrasonic welding of a resin layer formed on the inner machine component to the valve body. .   The valve body structure for a valve device according to claim 1, wherein the resin layer and the valve body are formed of the same resin.   The ultrasonic welding that joins the internal machine component and the valve body is an overlapping portion formed between the resin layer and the valve body formed at the leading end of the internal machine component pushed into the valve body. The valve main body structure for a valve device according to claim 1 or 2, wherein   The inner machine component is regulated in the pushing direction with respect to the valve body by the pushing tip portion abutting against the valve body, and the inner machine part and the valve body in which the ultrasonic welding is performed are performed. 4. The valve body structure for a valve device according to claim 3, wherein the overlapping portion is formed at a corner of the pushing tip portion of the internal machine part.   5. The valve body structure for a valve device according to claim 3, wherein a side surface of the internal machine component is a guide surface with respect to a direction in which the internal machine component is pushed into the valve body.   The valve device is a flow rate adjusting valve, and the internal unit component is a valve seat that is mounted in the valve main body of the flow rate adjusting valve and is a counterpart to which a valve body contacts and separates in order to control the flow rate. The valve main body structure for a valve device according to any one of claims 1 to 5.   The valve device is a flow regulating valve, and the internal component is a female screw that is mounted in a valve main body of the flow regulating valve and that is screwed with a male screw serving as a moving screw for driving the valve body. The valve main body structure for a valve device according to any one of claims 1 to 5. In a manufacturing method of a valve body structure for a valve device in which an internal machine part that is a metal part and a resin valve body are combined,
Production of a valve body structure for a valve device, wherein a resin layer is formed in advance at a site where the inner part is to be joined to the valve body, and the resin layer and the valve body are joined by ultrasonic welding. Method.   9. The method for manufacturing a valve body structure for a valve device according to claim 8, wherein the resin layer and the valve body are made of the same resin.   By performing the ultrasonic welding at an overlapping portion formed between the resin layer and the valve body formed at the leading end portion of the inner machine part pushed into the valve body, the inner machine part and the valve body The method for manufacturing a valve body structure for a valve device according to claim 8 or 9, wherein   The overlapping portion between the inner machine component and the valve body is formed at a corner of the pushing tip of the inner machine component, and the inner machine component is brought into contact with the valve body by the pushing tip against the valve body. The method of manufacturing a valve body structure for a valve device according to claim 10, wherein the valve body structure is restricted in a pushing direction.   The method for manufacturing a valve body structure for a valve device according to claim 10 or 11, wherein the inner machine part is pushed into the valve body while being guided on a side surface of the inner machine part with respect to the valve body. .

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