JPH08159304A - Disk valve - Google Patents

Abstract

PURPOSE: To obtain smooth sliding characteristics for a long period of time in a disk valve formed by mutually sliding valve bodies, by forming the sliding surface of one of the valve bodies of an amorphous hard carbon film, and forming the sliding surface of the other valve body of a resin having specific Rockwell hardness. CONSTITUTION: A faucet valve which is one example among disc valves opens/ closes fluid passages 24, 34 arranged in respective valve bodies 20, 30 by moving the movable valve body 20 under such a condition that the fixed valve body 30 and the movable valve body 30 are brought in contact with each other on their sliding surfaces 21, 31, so as to control adjustment of supply fluid, switching operation into warm water and water, etc. In this case, the fixed valve body 30 is formed in such a way that the surface of a base body 32 consisting of metal such as stainless having excellent corrosion resistance, alumina- and zirconia-ceramics, etc., is coated with an amorphous hard carbon film 33. Meanwhile, the movable valve body 20 is formed in such a way that the whole base body 22 consists of resin having the Rockwell hardness of more than 100. Hereby, smooth sliding characteristics without any wear can be obtained.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a disc valve used for a faucet valve, a chemical liquid valve and the like.

[0002]

2. Description of the Related Art Conventionally, a disk valve such as a facet valve or a valve for chemical liquid is arranged in a state where a movable valve body is slidably contacted with a fixed valve body housed in the valve body, and the movable valve body is The relative movement by the operating lever controls the opening and closing of the fluid passages formed in each valve body, and adjusts the supply fluid, switches between hot water and water, or mixes them.

In addition, such a disc valve is required to have no water leakage, excellent corrosion resistance, little noise and wear even during long-term sliding, and smooth sliding characteristics. Therefore, there has been proposed today a valve body forming a disc valve, which is made of ceramics which is excellent in corrosion resistance and wear resistance and has high dimensional accuracy.

In general, however, ceramics are often inferior in self-lubricating property, and it is difficult to obtain smooth sliding characteristics by sliding valve bodies made of ceramics. Therefore, a lubricant such as silicone grease is applied between sliding contact surfaces. It is used in the condition that

[0005]

However, in the case where the lubricant is interposed between the sliding contact surfaces like the above-mentioned disc valve, the lubricant leaks out after sliding several thousand times. Along with this, the operating force of the valve element increases, and if it gets worse, phenomena such as stick-slip that causes variation in sliding resistance and suspicion that the valve elements stick to each other and cannot move will occur, making it impossible to operate the valve element. There was a problem such as.

Therefore, in order to maintain good sliding characteristics with the ceramic valve body for a long period of time, a disk valve has been proposed in which at least one of the sliding valve bodies is coated with an amorphous hard carbon film. It is (actual Kaihei 4-1086
54 publication).

However, even in such a disc valve, since both valve bodies are made of a high hardness material, there is a problem that both sliding contact surfaces are worn.

Moreover, the amorphous hard carbon film is coated in a thin film state because the adhesion to the valve body made of a different material is not so good, and as a result, the amorphous hard carbon film is made of a ceramic valve body having a high hardness. It was worn out in a short period of time due to the sliding of No. 1, increasing the sliding resistance and causing water leakage.

Further, since both the sliding contact surfaces are finished to be very smooth surfaces, there is a problem that the sliding contact surfaces are scratched with each other, and the scratching causes an abnormal noise such as a key. Therefore, the above-mentioned problems could not be satisfied even in a disc valve in which a valve body coated with an amorphous hard carbon film is combined, such as giving a person discomfort.

[0010]

In view of the above-mentioned problems, the present invention forms the sliding contact surface of one of the sliding valve bodies with an amorphous hard carbon film, and the other valve body. A disc valve is formed by forming a sliding contact surface of a body with a resin having a Rockwell hardness of 100 or more.

The resin having a Rockwell hardness of 100 or more means polyamideimide (PAI), polyimide (PI), polyphenylene sulfide (PPS), polyether ether ketone (PEE).
K), polyamide (PA), tetrafluoroethylene resin (P
It is composed of a thermoplastic resin such as TFE), polyacetal (POM), and polyphenylene oxide (PPO).

Further, the resin constituting one sliding contact surface of the disc valve according to the present invention may be a composite resin in which a filler is mixed with the above resin material.

[0013]

EXAMPLES Examples of the present invention will be described below.

FIG. 1 is a perspective view showing only a valve body which constitutes a facet valve which is an example of a disc valve according to the present invention. A fixed valve body 30 and a movable valve body 20 are in sliding contact with each other 21. , 31 in contact with each other, the movable valve body 20 is moved to open / close the fluid passages 24, 34 provided in the respective valve bodies 20, 30 to adjust the supply fluid and switch between hot water and water. , Or control such as mixing.

As shown in FIG. 2, the fixed valve body 30 has a metal having high mechanical strength and excellent corrosion resistance, such as stainless steel and brass, or alumina, zirconia, silicon nitride, carbonized carbon. An amorphous hard carbon film 33 is formed on the surface of a substrate 32 formed of ceramics such as silicon.
To form a sliding contact surface 31.

By the way, the amorphous hard carbon film 33 covering the surface of the substrate 32 is a carbon film called a synthetic pseudo diamond film, a diamond-like carbon film, a DLC film, an I-carbon film, or the like. It has self-lubricating property and has a Vickers hardness (Hv) of 3000 to 5000 Kg / mm ² .

Further, as a material for forming the base body 32 which constitutes the fixed valve body 30, a Vickers hardness is 1000 kg.
/ Mm ² or more, and a material having a Young's modulus of 20000 to 45000 Kg / mm ² is preferable.

Furthermore, the surface of the base 32 is a movable valve body 2.
The flatness is 3 μm or less, preferably 1 μm or less in order to prevent water leakage when sliding with 0.
Further, in order to improve the adhesion with the amorphous hard carbon film 33, the surface roughness is 0.02 to 0.5 μ in terms of center line average roughness (Ra).
It is provided in the range of m. That is, the center line average roughness (Ra)
Is less than 0.02 μm, the surface of the substrate 32 and the film 33 are
This is because a sufficient anchoring effect cannot be obtained between and and the adhesive force is weakened and the film 33 may be peeled off during sliding, and conversely, the center line average roughness (Ra) is less than 0.1. 5μ
If it is larger than m, a large number of sharp projections are formed on the sliding contact surface 31, so that the movable valve body 20 is worn and further water leakage occurs.

When the film thickness T of the amorphous hard carbon film 33 is smaller than 0.1 μm, the film 33 is worn out in a short period of time, and conversely, the film thickness T of the amorphous hard carbon film 33 is 2 μm. .0
If it is larger than μm, it takes a huge amount of time for film formation, and the film 33 may be peeled off due to the compressive stress remaining in the film 33. Therefore, it is preferable that the film thickness T of the amorphous hard carbon film 33 is in the range of 0.1 to 2.0 μm.

As a means for coating the surface of the substrate 32 with the amorphous hard carbon film 33, a thin film forming means such as a PVD method or a CVD method can be used.

On the other hand, the movable valve body 20, as shown in FIG.
The entire base 22 is formed of a resin having a Rockwell hardness of 100 or more, and as such a resin, polyamide imide (PAI), polyimide (PI), polyphenylene sulfide (PPS), polyether ether ketone (PEEK), Polyamide (PA), tetrafluoroethylene resin (PTFE), polyacetal (P
OM), polyphenylene oxide (PPO), and other thermoplastic resins.

These resins are lightweight, have excellent corrosion resistance, and have a self-lubricating action.

Therefore, in the present invention, since the sliding contact surfaces 21 and 31 having self-lubricating property can be slid together,
Due to these synergistic effects, smooth and stable sliding characteristics can be obtained. Moreover, despite the sliding between the amorphous hard carbon film 33 having high hardness and the resin having low hardness, due to the synergistic effect of the self-lubricating action of the material forming the sliding contact surfaces 21 and 31, Since the movable valve body 20 having low hardness is not worn and the amorphous hard carbon film 33 of the fixed valve body 30 is not damaged, it can be used for a long period of time.

Further, the resin forming the movable valve body 20 is
Since it can be elastically deformed, when the sliding contact surface 21 of the movable valve body 20 is deformed by slightly increasing the pressing force when slidingly contacting the fixed valve body 30, a gap is created between the sliding contact surfaces 21 and 31. Since it does not occur, water leakage does not occur.

The reason why the hardness of the resin forming the base 22 is 100 or more in terms of Rockwell hardness is that when the Rockwell hardness is less than 100, the fixed valve body 30 is largely deformed when it is brought into sliding contact. Since it will bite, the sliding resistance will increase and good sliding characteristics will not be obtained, and
This is because the sliding contact surface 21 of the movable valve body 20 may be damaged by sliding with the sliding contact surface 31 made of the amorphous hard carbon film 33, and water leakage may occur. It should be noted that the movable valve body 2 can be moved even when sliding with the sliding contact surface 31 made of the amorphous hard carbon film 33.
In order to prevent scratches on the sliding contact surface 21 of 0, it is preferable that the base 22 is made of a resin having a tensile strength of 5 kg / mm ² or more in addition to the above hardness.

Further, the movable valve body 20 can be made of a composite resin in which a filler is mixed with the above resin. By using such a composite resin, the wear resistance and the self-lubricating property of the movable valve body 20 can be further improved. Can be increased.

For example, if glass fiber is used as the filler, the wear resistance of the movable valve body 20 can be further improved, and the tetrafluoroethylene resin (PTF) can be used as the filler.
By using E), MoS ₂ , carbon fiber, graphite, etc., the self-lubricating property of the movable valve body 20 can be further enhanced. However, it is preferable to keep the content of the filler up to 60% at most.

Further, in the movable valve body 20 shown in FIG. 3, the entire base body 22 is made of resin, but as shown in FIG.
The movable valve body 20 may be formed by forming the first base 22 of metal or ceramics and laminating the second base 23 of the above resin on the surface thereof.

In the embodiment of the present invention, a disk in which the sliding contact surface 31 of the fixed valve body 30 is formed of the amorphous hard carbon film 33 and the sliding contact surface 21 of the movable valve body 20 is formed of a specific resin. Although the valve has been described, conversely, the sliding contact surface 31 of the fixed valve body 30 is made of a specific resin, and
The sliding contact surface 21 may be a disk valve formed of the amorphous hard carbon film 33.

Further, in the embodiment of the present invention, only the facet valve, which is an example of the disc valve, is shown, but it goes without saying that it can be used as a disc valve such as a valve for chemical liquid.

[Experimental Example] A trialset valve as shown in FIG. 5 was prototyped and the sliding characteristics were tested.

The fixed valve body 30 constituting the Faucet valve of this experiment has a base body 32 made of alumina ceramics and an amorphous hard carbon film 33 coated on the surface thereof. Base 3
For No. 2, alumina powder having a purity of 96% was used as a starting material, 0.5% by weight of SiO ₂ and 0.2% by weight of MgO and CaO were added, respectively, and a binder was further added, and after stirring for 24 hours. Then, an alumina granule having an average particle diameter of about 3.7 μm was obtained with a spray dryer. Then, after the granulated body is molded into a predetermined disk shape by a die press, it is fired in an oxidizing atmosphere at a firing temperature of about 1600 ° C. and subjected to grinding and polishing to give an outer diameter of 32 mm,
A substrate 32 having a thickness of 5 mm and a flatness of 1 μm or less was formed.
Next, the substrate 32 is set on a substrate in a vacuum chamber, and a high frequency (13. 3) is applied between the electrodes assembled in the chamber while introducing butane (C ₄ H ₁₀ ) gas under a reduced pressure of 10 ^-2 Pa. 56 MHz), the base 32
Amorphous hard carbon film 33 with a thickness of about 0.5 μm on the surface of
To form a fixed valve body 30.

When the amorphous hard carbon film 33 was measured, the specific resistance was 10 ⁸ Ωcm and the Vickers hardness (H
v) It was 4000 kg / mm ² .

On the other hand, the movable valve body 20 is mainly composed of a polyphenylene sulfide resin (PPS) as a resin having a Rockwell hardness of 100 or more, and a polyphenylene sulfide resin (PPS) as a main component, and the resin contains 5% by volume of carbon. In addition to the fiber-added ones, three types of conventional alumina ceramics were prepared, each of which formed a disk-shaped substrate 22 having an outer diameter of 25 mm and a thickness of 7 mm, and then polished to make it flat. The degree was 1 μm or less.

Both valve bodies 20 thus formed,
As shown in FIG. 5, the casing 30 is set on the faucet (water faucet) while pressing the casing 30 with the axial force of 30 kgf so that the sliding contact surfaces 21 and 31 contact each other.
Under the condition that hot water at 0 ° C. was injected at a pressure of 1 kg / cm ² , the lever pressing force required to operate the operating lever 40 was measured with a push-pull gauge, and the value was measured. And

However, the evaluation standard of this experiment is that the one having an operating force of 0.7 Kgf or less after sliding 150,000 times is considered to be excellent.

The combination of both valve bodies is shown in Table 1, and the respective results are shown in FIG.

[0038]

[Table 1]

As can be seen from FIG. In 4,
Since the fixed valve body 30 was not covered with the amorphous hard carbon film 33, the movable valve body 20 was worn and the operating force became larger than 0.7 Kgf by sliding about 60,000 times. Further, in the subsequent sliding, the operating force rapidly increased, and finally the operating force increased to 1.5 Kgf.

On the other hand, sample No. In No. 3, although the fixed valve body 30 is covered with the amorphous hard carbon film 33, since the movable valve body 20 is made of alumina ceramics, high-hardness materials are slid to each other and operated by sliding 100,000 times. Power is 0.7Kg
It became larger than f, and at the same time, an abnormal noise such as squeaking was generated. In addition, the sample No. In 3, from 40,000 times to 12
There was a variation in the operating force when sliding every 10,000 times.

On the other hand, the sample No. In the first and second aspects of the present invention, the sliding contact surface 31 of the fixed valve body 30 is formed of the amorphous hard carbon film 33, and the sliding contact surface 2 of the movable valve body 20 is formed.
Since No. 1 is formed of polyphenylene sulfide resin (PPS) or this composite resin, it satisfies the standard value sufficiently and can maintain an operating force of 0.7 Kgf or less even after sliding 200,000 times. There was no sound. In particular, the sample No. In No. 1, since carbon fiber is mixed in the polyphenylene sulfide resin (PPS) that constitutes the movable valve body 20, the self-lubricating action of the movable valve body 20 can be further enhanced, and as a result, the initial sliding characteristics can be reduced to 20%. It was possible to maintain even after sliding 10,000 times.

After sliding 200,000 times, sample N
o. When the amount of wear of the sliding contact surface 21 of the movable valve body 20 according to Nos. 1 and 2 was measured, the amount of wear was only 0.5 μm or less, which was a level at which no problem occurred.

The movable valve body 20 is made of polyamideimide (PAI), polyimide (PI), polyetheretherketone (PEEK), polyamide (PA), tetrafluoroethylene resin (PTFE), polyacetal (PO).
M), polyphenylene oxite (PPO) and other resins were used and the same experiment was conducted, but the same results as this experiment were obtained.

[0044]

As described above, according to the present invention, among the valve bodies that slide with each other, the sliding contact surface of one valve body is formed of the amorphous hard carbon film, and the sliding contact surface of the other valve body is formed. Polyamideimide (PAI), polyimide (PI), or polyphenylene sulfide (PPS), polyether ether ketone (PEEK), polyamide (PA), tetrafluoroethylene resin (PTFE), polyacetal (POM), polyphenylene oxide (PPO) ), Etc., the disc valve is formed of a resin having a Rockwell hardness of 100 or more, so that the sliding contact surfaces made of low hardness resin are abraded by the synergistic effect of the self-lubricating action of both sliding contact surfaces. In addition, a very light operating force can be obtained for a long period of time without water leakage or abnormal noise.

[Brief description of drawings]

FIG. 1 is a perspective view showing only a valve body of a facet valve which is an example of a disc valve according to the present invention.

FIG. 2 is a perspective view showing only the fixed valve body of FIG.

FIG. 3 is a perspective view showing only the movable valve body of FIG.

FIG. 4 is a perspective view showing another movable valve body of FIG. 1.

FIG. 5 is a perspective view showing the structure of a facet valve used as an experimental device.

FIG. 6 is a graph showing the relationship between the number of times of operating the operating lever and the operating force in a sliding experiment.

[Explanation to Symbols] 20 movable valve body 21 sliding contact surface 22 base 24 fluid passage 30 fixed valve 31 sliding contact surface 32 base 33 amorphous hard carbon film 34 fluid passage

Claims (1)

[Claims] 1. A disc valve comprising sliding valve bodies, wherein the sliding contact surface of one valve body is formed of an amorphous hard carbon film, and the sliding contact surface of the other valve body is Rockwell hardness. A disc valve made of a resin having 100 or more.