JP2568856Y2 - Valve device - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a tap water tap, a hot / cold water mixing tap, a flow switching tap for a hot water washer for a toilet bowl, and a valve device for stopping or controlling the flow of various fluids.

[0002]

2. Description of the Related Art Generally, a valve device for mixing hot and cold water among valve devices for faucet used for domestic water supply will be described with reference to FIGS. The housing 1 has a hot water outlet 2 on a side surface thereof, and the base 12 has inlets 3, 4 for supplying water or hot water in communication with a water pipe or a water heater.

The valve housing recess 5 of the housing 1
The valve body 6, the valve body 7, and the guide ring 8 are housed on the base 12 in a state of being overlapped in order from the bottom, and a lever for operating the valve is provided on a lever holder 9 rotatably held at the upper inside of the housing 1. 10 are attached.

Here, the valve element 6 is fixed to the base 12 by fitting the inner surface of the housing 1 and a projection 11 provided on the base 12, and a pair of inflow passages 13 and 14 are formed by a predetermined arrangement of the valve element 7. It is formed in a C shape so as to communicate with the outflow channel 2 and the inflow channels 3 and 4 on one side. Further, the valve element 7 has a columnar shape smaller in diameter than the inner diameter of the valve storage recess 5, is sandwiched between the guide ring 8 and the valve element 6, and is slidable with respect to the valve element 6 and the guide ring 8. At the same time, a flow path 15 communicating with the outflow path 2 by cutting out a sliding surface for the valve element 6 is provided.

Further, a rubber O-ring 19 is incorporated in the upper part of the guide ring 8, and a rubber O-type packing 16 is incorporated between the valve element 6 and the base 12. The base 12 and the valve body 6, the valve body 6 and the valve body 7, and the valve body 7 and the guide ring 8 are pressed against and sealed by the elasticity of the seal 16 and the packing 16. The valve body 7 and the lever 10 are connected to the lever holder 9 by pins 18.
The valve body 7 is driven by vertically moving and rotating the lever 10, and the hot water / cold water and the mixed water are driven by the displacement of the flow passage 15. Removal and plugging can be performed.

FIGS. 1 and 2 show a closed state in which the valve element 7 is displaced most to the right in the figure and the flow passage 15 is not in communication with either of the two inflow passages 13 and 14. FIG. It shows the position of the valve body 7 that communicates with one of the inflow passages 13 and shows a state where hot or cold water is taken out alone. FIG.
Indicates a position of the valve body 7 in which the flow passage 15 communicates with both the inflow passages 13 and 14, and indicates a state in which the mixed water is taken out.

The above-described valve device adjusts the flow rate or changes the flow path according to the state of the sliding between the planar sliding surfaces of the valve element 6 and the valve element 7.
It can be used not only for hot water / cold water mixing taps, but also for switching the flow path of a hot water washer installed in a toilet or the like.

The valve 6 or 7 of such a valve device
It is either molded in ceramic, other fluorine resins, resin or molybdenum disulfide having the self-lubricating property, such as ultra high molecular weight polyethylene, of a resin filled with filler to increase the lubricity, such as carbon (e.g. real Japanese Patent Laid-Open No. 63-36765).

Further, the inventor of the present invention has proposed that the resin component constituting the valve body is a mixture of a polyetherimide resin, a polyethersulfone resin and carbon fibers, glass fibers, and an appropriate powdered filler. Resin 35-90
% By weight and carbon fibers having an average fiber diameter of 8 μm or less.
% By weight of a resin composition (Japanese Patent Application No. 1-106887).
No. 1) and proposed a resin composition comprising 25 to 80% by weight of a polyphenylene sulfide resin and 20 to 75% by weight of carbon fibers having an average fiber diameter of 8 μm or less (Japanese Patent Application No. 1-10686).

[0010]

However, since the sliding surfaces between the pair of valve bodies are formed of flat surfaces, even if there is a slight deviation in flatness due to a processing error, the liquid-tightness is obtained. Hydraulic pressure of 17.5kgf /
There is a problem that the liquid leaks in a water stoppage test in cm ² .

The present invention solves the above-mentioned problems and prevents the valve device from completely leaking a fluid having a hydraulic pressure of 17.5 kgf / cm ² without a slight error in the machining accuracy of the valve body. An object of the present invention is to make water or a flow rate adjustable so as to satisfy practical reliability.

[0012]

In order to solve the above-mentioned problems, in the present invention, a notch or an opening is provided in a valve element fixed inside a housing and a movable valve element slidably superimposed on the valve element. In a valve device that performs water stoppage or flow rate adjustment by displacement of the pair of valve bodies,
At least one of the pair of valve elements is a synthetic resin valve element, and the sliding contact surface of the synthetic resin valve element with the other valve element has a smooth central part 3 to 5 μm higher than the outer peripheral edge. It adopted the structure formed at the middle and high.

[0013]

In the valve device according to the present invention, when a pair of valve bodies are combined in the housing, the smooth middle sliding surface of the synthetic resin valve body is formed into the shape of the sliding surface of the other valve body. Correspondingly elastically deforms and closely contacts to increase the surface pressure. Therefore, slight deviation in flatness due to an error in machining accuracy of the valve
Even if there is, no gap is formed between the two valve bodies under the use condition of the required hydraulic pressure, and the liquid does not leak.

[0014]

An embodiment of the present invention will be described below with reference to the drawings. As shown in FIG. 1, in the embodiment, a valve body 6 made of high-hard ceramics and having a flow path 13 and 14 and a valve body 7 made of self-lubricating synthetic resin are sequentially stacked on a base 12 inside a housing 1. The sliding surface of the cylindrical valve element 7 having a diameter of about 28 mm and having a notch at the bottom with the valve element 6 is wrapped or polished so that the central portion is 3 to 3 mm from the outer peripheral edge.
It was formed at a smooth height of 5 μm.

The lever holder 9 rotatably held inside the upper portion of the housing 1 is made of polyacetal resin, and a pin 18 is horizontally mounted on the lever holder 9 to link the link rod 1 with the lever.
7 and the lever 10 are connected. A ring-shaped stepped concave portion 9a is formed on the lower end surface of the lever holder 9, and an O-ring 19 and a guide ring 8 made of ultra-high molecular polyethylene are accommodated inside the ring-shaped concave portion 9a. An oil retaining groove 8a is formed and these are brought into sliding contact with each other in a liquid-tight manner. The molding materials of the valve body 6 and the valve body 7 may be exchanged with each other, and the sliding surface of the valve body 6 may be made a smooth middle height.

The molding material of the valve body 7 used in the present invention may be, for example, the following resin composition (1). Polyphenylene sulfide resin 60% by weight, carbon fiber 20% by weight, mica 20% by weight Polyetheretherketone resin 60% by weight, carbon fiber 20% by weight, mica 20% by weight Polyphenylene sulfide resin 50% by weight, glass beads 50% by weight [Experiment Example 1 and Experimental Example 2] The valve body 7 is formed from the resin composition having the self-lubricating property described above, and the sliding contact surface of the resin valve is brought into close contact with the lapping plate by an automatic lapping machine (manufactured by NTN Corporation). Then, the sliding surface was polished while rotating the resin valve to form a smooth middle height. Then, the unevenness of the surface of the valve element 7 was examined with a surface roughness measuring instrument (Tallysurf 6: trade name) by running a measuring terminal in the diameter direction, and the results are shown in FIGS. 6a and 6b, respectively. As a result, in the case of Experimental Example 1, the central portion was formed to be about 5 μm higher than the periphery, and in the case of Experimental Example 2 was formed to be about 3 μm higher, so that it was formed at a smooth middle height.

Next, the following practical function tests were performed on the valve bodies 7 of Experimental Examples 1 and 2. (1) Practical function test: Single lever type mixing faucet KM300 manufactured by Kitamura Valve Co., Ltd.
Using N, the valve body 6 made of ultra-high quality ceramic was slid on the valve body 7 to perform an initial torque test and a water stoppage test. In the torque test, upper and lower levers (water stoppage, flow, flow rate control) and left and right (temperature control of hot water and cold water) are measured using a digital force gauge DFG-2K manufactured by Shinpo Kogyo Co., Ltd. In the test, the lever was set at the center lower part (water stop state), and the water pressure was maximally 17.5 by a pump.
kgf / cm ² , the maximum water pressure at which no water leaked for 1 minute was measured.

In these initial tests, the torque was 5 kg.
The same single-lever mixing as the initial test on a single-lever mixing faucet endurance tester (not shown) was performed for a water-stop test with a water pressure of f · cm or less and a water stop test of 17.5 kgf / cm ² completely. The lever 10 of the stopper is connected, and the lever is moved from the upper right end Ru to the lower right end R as shown in FIG.
d (cold water) → lower left end Ld (hot water 90 ° C) → upper left end L
u (water stoppage) → lower left end Ld (hot water 90 ° C) → lower center C
d (warm water) → upper center Cu (water stop) → lower center Cd (warm water) → lower right Rd (cold water) → upper right Ru (water)
As a cycle (duration of about 25 seconds), a 200,000 cycle endurance test was performed, and the torque and water stoppage after the 100,000 and 200,000 cycle tests were confirmed in the same manner as in the initial stage.

As a result, the valve device equipped with the valve bodies 6 and 7 of the above-mentioned experimental examples 1 and 2 had a maximum of 17.5 before and after the test.
There was no leakage at a water pressure of kgf / cm ² , and the steering wheel torque was low and stable, so there was no problem in use.

Comparative Example 1 The same procedure as in Experimental Examples 1 and 2 was adopted except that the valve element 7 was molded from the resin composition having the self-lubricating property described above, and was processed by a lapping machine so that the central portion of the surface was concave. They were formed in exactly the same way and the surface roughness was measured. The result is shown in FIG. As a result,
The valve element 7 of the comparative example was formed in a smooth curved surface having a central portion recessed by about 1 μm.

Next, the above-mentioned practical functionality was performed under exactly the same conditions, but in the initial water stop test, 17.5 kgf / cm
^A water leak occurred at a water pressure of less than ² , and the subsequent durability test was stopped.

[0022]

According to the present invention, as described above, at least one of the sliding surfaces of a pair of synthetic resin valve bodies of a valve device is formed into a smooth middle-high shape so as to be brought into pressure contact with other valve bodies to improve their surface pressure. The liquid-tightness of the valve device is further improved, so that the practical water-stopping reliability of the valve device is further ensured, and in particular, 17.5 kgf /
There is an advantage that it can sufficiently withstand a water stoppage test under a hydraulic condition of cm ² .

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view of an embodiment.

FIG. 2 is a cross-sectional view illustrating an operation state of the valve body of FIG. 1;

FIG. 3 is a cross-sectional view illustrating an operation state of the valve body of FIG. 1;

FIG. 4 is a cross-sectional view illustrating an operation state of the valve body of FIG. 1;

FIG. 5 is a perspective view showing the appearance of a mixing tap.

6A is a graph showing the relationship between the surface roughness of Experimental Example 1 and the measurement distance. FIG. 6B is a graph showing the relationship between the surface roughness of Experimental Example 2 and the measurement distance.

FIG. 7 is a graph showing a relationship between a surface roughness and a measurement distance in a comparative example.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Housing 2 Outflow path 3, 4, 13, 14 Inflow path 6, 7 Valve 9 Lever holder 10 Lever 15 Flow path 16 Packing 19 O-ring

Claims (1)

(57) [Scope of request for utility model registration] 1. A notch or an opening is formed in each of a valve body fixed inside a housing and a movable valve body slidably superimposed on the valve body, and water stoppage or flow rate adjustment is performed by displacement of the pair of valve bodies. In the valve device, at least one of the pair of valve bodies is made of a synthetic resin valve body, and a sliding contact surface of the synthetic resin valve body with the other valve body is such that the center portion is closer to the outer peripheral edge. A valve device characterized by being formed at a smooth middle height of 3 to 5 μm .