JP5060874B2 - Ball valve - Google Patents

Description

The present invention relates to a ball valve used as a three-way switching ball valve or a four-way switching ball valve for switching a flow path of a hot water supply system.

Conventionally, a four-way of a ball valve, the fluid flowing from the inlet to the switching or change the route leading to each of the three-way switching ball valve, or three outlet to switch or change the route leading to each of the two outlet A switching ball valve is used.

Such a ball valve is used for a unit bath, for example, and is applied to a circulation path that circulates by adjusting the temperature of hot water in a bathtub with a hot water supply unit. In the case of a four-way switching ball valve , hot water flowing through the circulation path is supplied by switching to a bathtub, a hot water supply unit, or the outside and one of three routes.

FIG. 3 is a partially sectional side view showing an example of this type of conventional ball valve , and FIG. 4 is a plan view of a motor mounting portion of the ball valve of FIG. This ball valve is configured as a three-way switching ball valve , and a spherical valve body 10 is rotatably supported in a valve chamber 21 formed in the valve case 20. The valve body 10 is formed with a flow path including an inflow path 11 and an outflow path 12 connected to the inflow path 11. In the valve case 20, an inflow port 22 connected to the inflow passage 11 is formed, and a first outflow port 23 is formed as an outflow port.

  A second outlet 24, which is another outlet, is connected to the valve case 20. The base end portion 25 of the second outlet 24 is welded to the valve case 20 by, for example, ultrasonic welding. The annular welded portion 25a on the base end portion 25 side is welded to the annular welded portion 22a on the valve case 20 side. An annular valve body contact portion 25b is formed inside the welded portion 25a, and the spherical valve body 10 is in contact with the valve body contact portion 25b.

  A geared motor 30 as a drive unit for rotationally driving the valve body 10 is attached to the motor mounting part 26 of the valve case 20. The valve shaft 31 connected to the output shaft of the geared motor 30 extends through a through hole 27 formed in the motor mounting portion 26 of the valve case 20, and the tip is connected to the valve body 10. By driving the geared motor 30, the rotation of the valve shaft 31 is transmitted to the valve body 10, and the valve body 10 rotates in the valve chamber 21.

  The valve shaft 31 is formed with circumferential grooves 32 at a plurality of locations (two locations in the axial direction in the illustrated example), and O-rings 33 are fitted into the circumferential grooves 32. The O-ring 33 is in pressure contact with the inner peripheral surface of the through hole 27 and prevents the hot water in the valve chamber 21 from leaking outside through the through hole 27.

By rotating the valve body 10, the outflow path 12 of the valve body 10 is communicated with the first outlet 23 or the second outlet 24, so that the inlet 22 is connected to the first outlet 23 through the flow paths 11 and 12. Any one of the second outlets 24 can be selectively communicated. An example of this type of ball valve is disclosed in Patent Document 1.

  The valve case 20 is molded from a resin such as SPS (syndiotactic polystyrene resin) that is lightweight and excellent in heat resistance and chemical resistance, for example. By achieving uniformity, molding defects called sink marks are prevented from occurring during molding. It should be noted that a reinforcing rib is provided at a location where the strength is insufficient due to the thinning, thereby improving the strength.

  As shown in FIG. 4, the motor mounting portion 26 of the valve case 20 is formed with the outer peripheral edge portion 2 and the bearing portion 5 that rotatably supports the valve shaft 31 with substantially the same width. Of the outer peripheral edge portion 2, two corner portions 2 a and 2 b are provided with pin holes 3 and 3 into which positioning pins provided on the geared motor 30 are inserted, and the positioned geared motor 30 is attached to the motor mounting portion 26. Mounting holes 4 and 4 are formed into which fixing tools for fixing are inserted. The peripheral surfaces of the pin holes 3 and the attachment holes 4 are formed as flat surfaces that are continuous with the outer peripheral edge 2.

  In the case of the motor mounting portion 26, a meat stealer (indicated by hatching) 6 is provided, leaving the outer peripheral edge portion 2 including the corner portions 2 a and 2 b and the bearing portion 5. In order to compensate for the lack of strength due to the provision of the meat stealing 6, the bearing portion 5 is formed with a plurality of ribs 7 extending radially outward. The plurality of ribs 7 are formed so as to couple the bearing portion 5 and the outer peripheral edge portion 2. The top surface of the rib 7 is formed flush with the top surface of the outer peripheral edge portion 2 including the corner portions 2a and 2b and the bearing portion 5 so as to come into contact with the bottom surface of the geared motor 30 without a gap.

By the way, when it reinforces by providing the rib 7 regarding such a molded article, since the joint part 8 of the bearing part 5 and the rib 7 becomes thicker than the other part around it, the molten resin is solidified. Sinking may occur due to contraction of the skin. When this sink mark is generated on the inner peripheral surface of the bearing portion 5, it becomes impossible to secure a seal by the O-ring 33 provided between the valve shaft 31 and the bearing portion 5, which causes fluid leakage.
Japanese Unexamined Patent Publication No. 2004-278631 (paragraphs 0003 to 0005, 0017 to 0019, FIGS. 2 to 4)

Accordingly, an object of the present invention is to prevent fluid leakage due to sink marks during molding in a ball valve in which a valve body having a through hole through which a valve shaft for rotating a valve body passes is a resin molded product. .

To achieve the above object, a ball valve according to the invention, the inlet and a plurality of outlet and a resin molded article formed of the valve case, be rotated is rotatably disposed within the valve casing the flow Bei example a ball valve for selectively communicating the inlet to one of said outlet, is driven to rotate the ball valve body by a motor mounted on a motor mounting portion provided continuously to the valve casing by a ball valve, the valve casing includes a bearing portion of the annular having a through hole which the valve shaft rotating the ball valve element extends, and a plurality of thinned formed around the said bearing portion, said It has a rib for a plurality of reinforcement extending outwardly from the outer periphery of the bearing portion, each of said ribs are continuous with the bearing part via a bridge portion of the fan shape, each of the bridge portions The motor equipment It is characterized in that the small thinned cylindrical in depth corresponding to the thickness of the part is formed.

According to this ball valve , a small-wall stealer that reduces the wall thickness is formed at the coupling portion between the reinforcing rib and the bearing portion. There is no sink on the inner peripheral surface of the through-hole that would occur when it was formed to be significantly thicker, and it is possible to prevent the fluid in the valve case from leaking outside through the through-hole. it can.

Hereinafter, embodiments of a ball valve according to the present invention will be described with reference to the accompanying drawings. FIG. 1 is a side view showing a part of the ball valve of the present embodiment in section, and FIG. 2 is a plan view of a motor device portion of the ball valve of FIG. In the ball valve shown in FIGS. 1 and 2, the same reference numerals as those in FIGS. 3 and 4 are used for the same structure as the conventional ball valve shown in FIGS.

According to the ball valve 1 shown in FIGS. 1 and 2, the thickness of the four coupling portions 8 where the four ribs 7 extending radially outward from the bearing portion 5 are coupled to the bearing portion 5 is reduced in thickness. A small meat steal 9 to be reduced is formed. The small meat steal 9 is formed so as to extend vertically in the central portion of the coupling portion 8. As shown in the cross-sectional view of FIG. 1, the small meat stealer 9 is formed in a cylindrical shape with a depth corresponding to the thickness of the motor mounting portion 26 from the upper surface of the motor mounting portion 26.

  Therefore, in the coupling portion 8, the bearing portion 5 is connected to the rib portion 7 via the fan-shaped bridge portions 8a and 8a that are part of the cylinder, and the coupling portion 8 is significantly thicker than the surroundings. Never become. Therefore, it is possible to avoid the occurrence of sink marks when the resin is cooled and solidified.

In this ball valve , sink marks do not appear on the inner peripheral surface of the bearing portion 5 during injection molding. As a result, there is no gap between the O-ring 33 attached to the valve shaft 31 and the inner peripheral surface of the bearing portion 5, or the seal pressure does not lead to seal leakage.

It is a figure which shows one Embodiment of the ball valve by this invention, Comprising: It is a side view which shows a part in cross section. It is a top view of the motor mounting part of the ball valve shown in FIG. It is a figure which shows an example of the conventional ball valve , Comprising: It is a side view which shows a part in cross section. It is a top view of the motor mounting part of the ball valve shown in FIG.

DESCRIPTION OF SYMBOLS 1 Ball valve 2 Outer peripheral edge part 2a, 2b Corner part 3 Pin hole 4 Mounting hole 5 Bearing part 6 Thin part 7 Rib 8 Coupling part 9 Small stealing 10 Valve body 11 Inflow path 12 Outflow path 20 Valve case 21 Valve chamber 22 Flow Inlet 22a Welded portion 23 First outlet 24 Second outlet 25 Base end portion 25a Welded portion 25b Valve body abutting portion 26 Motor mounting portion 27 Through hole 30 Geared motor 31 Valve shaft 32 Circumferential groove 33 O-ring

Claims (3)

Inlet and a plurality of outlet and a resin molded article formed of the valve casing, selectively the inlet to one of said outlet by rotating is rotatably disposed within the valve casing e Bei a ball valve element to communicate, a ball valve that rotates the ball valve body by a motor mounted on a motor mounting portion provided continuously on the valve casing,
It said valve casing includes a bearing portion of the annular having a through hole which the valve shaft rotating the ball valve element extends, and a plurality of thinned formed around the bearing portion, out of the outer periphery of the bearing portion It has a plurality of ribs for reinforcement that extends towards each of the ribs is continuous with the bearing part via a bridge portion of the fan-shaped, the thickness of the motor mounting section in each of the bridge portions A ball valve characterized in that a cylindrical thin wall stealer is formed at a depth corresponding to . The ball valve according to claim 1, wherein a gap between an inner peripheral surface of the through hole and the valve shaft is sealed by a sealing member such as an O-ring. The ball valve according to claim 1 or 2, wherein a plurality of the ribs are formed so as to extend radially from the outer periphery of the bearing portion.

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