JP2004232780A - Selector valve - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a selector valve having high durability, functional stability and workability. <P>SOLUTION: This selector valve is composed of a valve element 10 having channels 11, 12, a valve case 20 having a valve chest 21 for rotatably accommodating the valve element 10, and an inflow port 22 and a plurality of outflow ports 23-25 formed on the valve case 20. The inflow port and any one of the outflow ports are communicated by the channel by the rotation of the valve element 10. The valve case 20 and the valve element 10 are sealed by a packing 41 mounted on the valve case. A slide contact part with the valve element 10, of the packing 41 partially has a film layer 42 of Teflon (R). <P>COPYRIGHT: (C)2004,JPO&NCIPI

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a switching valve, and more particularly to a switching valve having a valve chamber in which a valve element is rotatably housed.
[0002]
[Prior art]
Conventionally, as a switching valve, for example, a four-way switching valve for a unit bus is disclosed in Patent Document 1 below.
[0003]
[Patent Document 1]
JP 2000-18405 A
FIG. 5 schematically shows an example of a unit bath described in the above-mentioned publication. Usually, the unit bus includes devices such as a hot water supply unit A, a bathtub B, a four-way switching valve V, and a filter C. , And each device is connected by a pipeline. In a normal operation, the unit bath returns hot water in the bathtub B to the bathtub B via the hot water supply unit A, the filter C, and the four-way switching valve V (the flow of hot water is indicated by an arrow (I)). The hot water supply unit A adjusts the hot water temperature to maintain the hot water temperature in the bathtub B at a suitable temperature for bathing.
[0005]
The filter C is for filtering the hot and cold water circulating in the main circulation path (I). However, if the hot and cold water is circulated, the filter C may be stained with dirt, dust, etc. There is a risk of becoming. Therefore, it is necessary to periodically clean the filter C. In this case, the four-way switching valve V is switched, and the hot water is returned to the bathtub B without being returned to the bathtub B. The hot water is circulated so as to be guided to the four-way switching valve V through the filter C while raising the temperature.
As a result, the filter C is washed by circulating high-temperature hot and cold water for a required time, and when the washing is completed, the four-way switching valve V is switched to discharge the washing hot water from the filter C to the outside through the four-way switching valve V. I do.
[0006]
The four-way switching valve V is configured to be able to switch the hot and cold water of the unit bath to three routes of a main circuit, a cleaning circuit and an external discharge, and has one inlet 101 and three outlets, ie, three outlets. , A washing outlet 102, a return outlet 103, and a discharge outlet 104.
[0007]
FIG. 6 is a longitudinal sectional view showing an example of the four-way switching valve V. The four-way switching valve V includes a valve case 112, a gear motor 120 disposed on the valve case 112, A ball-shaped valve element 130 disposed in a valve chamber 115 in a valve case 112, and a screw provided on a left side opening 115 a of the valve case 112 to hold the ball-shaped valve element 130 in the valve chamber 115. A holding sheet 136 screwed into the joint 136a and a valve cover 113 for closing the left side opening 115a are provided. The valve case 112 has one inflow port 101 at a lower portion and two outflow ports 104 and 102 at side portions, and an outflow port (washing outflow port) 102 and an outflow port (discharge outflow port) 104. Are arranged 90 degrees out of phase. Further, one outlet (return outlet) 103 is also formed in the valve cover 113.
[0008]
The ball-shaped valve element 130 is provided with an inflow path 131 and an outflow path 132 having a circular cross section that merge near the center thereof. The inflow path 131 is always connected to the inflow port 101, The passage 132 is arranged so as to be alternatively connected to the three outlets 102, 103, 104.
[0009]
The ball-shaped valve element 130 is driven to rotate by a geared motor 120 via a valve shaft 125, and the unit bus is selected from three routes of a main circuit (I), a cleaning circuit (II), and an external discharge (III). The rotational position can be set so that the switching can be changed temporarily. The hot and cold water flowing from the inflow port 101 of the valve case 112 is guided from the inflow path 131 of the ball-shaped valve element 130 to the outflow path 132, and is rotated by the ball-shaped valve element 130 to change the switching position. One of the three outlets 102, 103, and 104 so as to flow through one of three routes: a main circuit (I), a cleaning circuit (II), or an external discharge (III). The four-way switching valve V functions as switching means for the respective circulation paths of the unit bus.
[0010]
Further, in the four-way switching valve V, a plurality of packings 141 and 142 are interposed at a contact portion between the ball-shaped valve element 130 in the valve chamber 115, the valve case 112 and the holding sheet 136, and the valve is connected at the contact portion. Leakage of hot water from the chamber 115 to each of the three outlets 102, 103, 104 or each of the three outlets 102, 103, 104 to the valve chamber 115 is prevented.
[0011]
[Problems to be solved by the invention]
In such prior art, packing is used as the sealing material of the valve body as described above, but the packing is made of an elastic body, and the fluid sometimes contains foreign matter. As a result, the packing may be damaged due to long-term use, and not only the sealing function may be reduced, but also the support function of the valve body may be reduced.
Therefore, in order to improve the sealing function of the valve body, for example, as shown in FIG. 7, packing is not used, and at least a sliding contact portion 20a of the valve case 20 with the valve body 10 is made of an elastic material capable of sealing. Is also conceivable. However, although this means also improves the sealing performance, it may reduce the function of supporting the valve element.
As another means, as shown in FIG. 8, a means for integrally forming a resin film, for example, a Teflon film 143, on the entire sliding contact side of the ball-shaped valve body on the packing 141, 142 side is also conceivable. According to the method, the slidability with respect to the ball-shaped valve body is improved, but the sealing property may be reduced.
[0012]
SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a sealing portion which performs a leakage preventing action on a sliding contact portion of a packing to a valve body with a sliding contact portion having low sliding resistance. With the above configuration, it is an object to provide a switching valve having excellent sealing performance and sliding performance.
[0013]
[Means for Solving the Problems]
In order to achieve the above object, the switching valve according to the present invention has taken the following measures.
The switching valve according to claim 1 includes a valve body having a flow path, a valve case having a valve chamber in which the valve body is rotatably housed, an inlet formed in the valve case, and a plurality of outlets. A switching valve for rotating the valve body to allow the inflow port and any one of the outflow ports to communicate with each other through the flow path, and to seal between the valve case and the valve body by packing mounted on the valve case. Wherein a coating layer made of a synthetic resin is formed on a part of the packing in sliding contact with the valve element.
With such a feature, the film layer has a function of supporting the valve body, and the sliding contact portion on which the film layer is not formed has a sealing function.
[0014]
According to a second aspect of the present invention, there is provided the switching valve according to the first aspect, wherein the sliding contact portion is provided at two locations, and a film layer is formed at one location.
With such a feature, it is possible to provide a switching valve having a packing layer whose configuration and processing are simple.
According to a third aspect of the present invention, there is provided the switching valve according to the first aspect, wherein the sliding contact portions at other locations are seal portions.
With such a feature, it is possible to provide a switching valve in which the film layer has a function of supporting the valve body, and the sliding contact portions at the other locations have a packing (seal) function.
[0015]
According to a fourth aspect of the present invention, the switching valve includes a valve body having a flow path, a valve case having a valve chamber in which the valve body is rotatably housed, an inlet formed in the valve case, and a plurality of outlets. A switching valve for rotating the valve body to allow the inflow port and any one of the outflow ports to communicate with each other through the flow path, and to seal between the valve case and the valve body by packing mounted on the valve case. Wherein the packing has a seal portion and a sliding portion and is brought into sliding contact with the valve body.
With such a feature, the packing can be provided with both a sealing property and a sliding property with respect to the valve element.
According to a fifth aspect of the present invention, there is provided the switching valve according to the fourth aspect, wherein the sliding portion is formed with a film layer made of a synthetic resin.
With such a feature, the film layer can have a function of supporting the valve element.
The switching valve according to claim 6 is the switching valve according to claim 2 or 5, wherein the film layer is Teflon.
Due to such features, the coating can be easily processed and a durable coating layer can be obtained.
[0016]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, an embodiment of a switching valve of the present invention will be described in detail with reference to the drawings. FIG. 1 is a partially detailed view of the packing of the switching valve according to the present invention (enlarged portion A in FIG. 2), FIG. 2 is a longitudinal sectional view of the switching valve, FIG. 3 is a horizontal sectional view of the switching valve, and FIG. Is a longitudinal sectional view of the packing. 1 to 3, the same parts as those in FIGS. 4 and 5 are denoted by the same reference numerals, and description thereof is omitted.
[0017]
As shown in FIGS. 2 and 3, the switching valve according to the present embodiment has a spherical valve body 10 in which a flow path including an inflow path 11 and an outflow path 12 is formed. The valve case 20 has an inlet 22 and three outlets 23, 24, 25 formed in the valve case 20. The valve body 10 is supported and sealed by a packing 41 provided in the valve case 20. What is done and that the inflow port 22 and the outflow ports 23, 24, 25 can be selectively communicated by the flow paths 11, 12 are basically the same as those of the prior art.
[0018]
The configuration of the switching valve according to the present embodiment is such that when the packing 41 mounted on the valve case 20 seals between the valve case 20 and the valve body 10, two sliding contact portions of the ring-shaped packing 41 with the valve body 10 are provided. One of the ring-shaped sliding contact portions 41b shown in FIG. 4 is that a hard synthetic resin layer, for example, a Teflon (PTFE) layer 42 made of Teflon is formed.
One embodiment of the shape of the packing 41 in the switching valve according to the present invention will be described with reference to FIGS. FIG. 1 is a detailed view of a packing showing the embodiment, and FIG. 4 is a longitudinal sectional view of the packing.
In FIG. 1, reference numeral 41 denotes a packing, which is formed in a block shape as a whole. Reference numeral 10 denotes a ball valve that comes into contact with the packing 41. The packing 41 comes into sliding contact with the ball valve 10 at two sliding contact portions 41a and 41b. That is, the sliding contact portion 41a is a sealing portion that mainly ensures the sealing performance, and the sliding contact portion 41b is a sliding portion that mainly ensures the sliding performance with the ball valve 10.
The sliding contact portion 41b has a flat portion 43a of the first convex portion 43 of the packing 41 and a resin film layer 42 such as Teflon formed on a rising portion 43b, and a corner formed by the flat portion 43a and the rising portion 43b. It consists of.
Further, the sliding contact portion 41a is configured by a corner portion of the second convex portion 44 which is continuous with the first convex portion 43 through the first convex portion 43 and the step portion. In FIGS. 1 and 4, reference numeral 45 denotes a projection for maintaining a sealing property with the valve case 20.
[0019]
The Teflon layer 42 as the resin coating layer is integrally formed on a packing 41 made of rubber (for example, EPDM) by baking. The sliding contact portion 41a on which the Teflon layer 42 is not formed is configured as a seal portion, and the sliding contact portion 41b on which the Teflon layer 42 is formed is configured as a support portion of the valve body 10. It goes without saying that the cross-sectional shape of the packing 41, the cover range of the Teflon layer 42, the thickness of the layer, and the like can be variously changed.
[0020]
Further, although the embodiment of the present invention relates to a switching valve, it goes without saying that the present invention can be applied to other valve balls.
[0021]
【The invention's effect】
As can be understood from the above description, the switching valve according to the present invention has the above-described configuration, and the hard component resin formed on a part of the sliding contact portion of the packing, in particular, the Teflon film layer has the function of supporting the valve element. By providing a sealing function to the sliding contact portion where no film layer is formed, a switching valve having high durability, reliability, and workability can be obtained.
In addition, the sliding contact portion of the packing is formed at two places, and a film layer is formed at one of the sliding contact portions, and the sliding contact portions at the other positions are formed as seal portions, thereby forming a packing layer that is easy to configure and process. be able to.
[Brief description of the drawings]
FIG. 1 is a detailed view of a main part (packing) showing an embodiment of a switching valve according to the present invention.
FIG. 2 is a vertical sectional view of the switching valve.
FIG. 3 is a horizontal sectional view of the switching valve.
FIG. 4 is a vertical sectional view of a packing of the switching valve.
FIG. 5 is a schematic diagram of a hot water supply system of a unit bath having a reheating function in which a switching valve is used.
FIG. 6 is a longitudinal sectional view of a conventional switching valve.
FIG. 7 is a cross-sectional view showing another sealing means in a valve body support portion of the switching valve.
FIG. 8 is a sectional view showing another shape of the packing of the switching valve.
[Explanation of symbols]
A: Hot water supply unit B: Bathtub C: Filter V ... (four-way) switching valve 10: Valve body, ball valve (this invention)
11, 12 ... flow path 20 ... valve case 20a ... sliding contact part 21 ... valve chamber 22 ... inlet 23 ... (first) outlet 24 ... (second) outlet 25 ... ( 3) Outflow port 41, packing 41a, sliding contact part (seal part) 41b, sliding contact part (sliding part)
42 synthetic resin film (Teflon) layer 43 first convex part 43a flat part 43b rising part 44 second convex part 101 inflow port 102 first (for cleaning) Outlet 103 ··· Second (for return) outlet 104 ··· Third (for discharge) outlet 112 ··· Valve case 113 ··· Valve cover 115 ··· Valve chamber 115a ··· Left side opening 120 ···モ ー タ ー Motor 125 ・ Valve shaft 130 ボ ー ル Ball-shaped valve 131 流入 Inflow passage 132 流出 Outflow passage 136 ・ Holding sheet 136 a ・ Threaded portion 141, 142 パ ッ Packing 143 テ Teflon layer

Claims (6)

A valve body having a flow path, a valve case having a valve chamber in which the valve body is rotatably housed, and an inlet and a plurality of outlets formed in the valve case, the rotation of the valve body A switching valve for connecting the inflow port and any one of the outflow ports with the flow path and sealing between the valve case and the valve body by a packing mounted on the valve case; A switching valve characterized in that a coating layer made of synthetic resin is formed on a part of the contact portion. 2. The switching valve according to claim 1, wherein the sliding contact portion has two portions, and a film layer is formed on one of the two portions. 2. The switching valve according to claim 1, wherein the sliding portion at the other position is a seal portion. A valve body having a flow path, a valve case having a valve chamber in which the valve body is rotatably housed, and an inlet and a plurality of outlets formed in the valve case, the rotation of the valve body A switching valve that allows the inflow port and any one of the outflow ports to communicate with each other through the flow path, and that seals between the valve case and the valve element with a packing mounted on the valve case, wherein the packing includes a sealing portion and A switching valve having a sliding portion and slidingly contacting the valve body. The switching valve according to claim 4, wherein the sliding portion is formed with a film layer made of a synthetic resin. The switching valve according to claim 2 or 5, wherein the coating layer is Teflon (registered trademark; the same applies hereinafter).

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