Disc Valve

Abstract

To provide a disc valve in which polishing burrs never occur even in a synthetic resin-based disc valve of a disc valve device that switching a flow path and a flow rate in a refrigerant valve device, a human body local cleaning device or the like.SOLUTION: A disc valve 1 is a synthetic resin disc valve that is used in a disc valve device that switches a flow path and a flow rate of fluid, and slides with a mating disc valve. The sliding surface of the disc valve 1 is a polished surface 3 on which at least one recess part 4 of a groove part and a hole part into which the fluid is introduced is formed. The disc valve 1 has an inclined part 6 inclined by 10 to 25 degrees with respect to the polished surface 3 around the opening part of the recess part 4 on the polished surface 3.SELECTED DRAWING: Figure 3

Description

[Technical field]

[0001] The present invention relates to a disk valve for use in a human body local cleansing device, a refrigerant valve device, etc. [Background technology]

[0002] Disk valve devices that switch flow paths and flow rates are used in refrigerant valve devices, human body local cleansing devices, etc. (Patent Document 1, Patent Document 2) In this disk valve device, a valve body is slidably disposed on a valve seat, and grooves and holes that serve as flow paths are formed in the valve seat and the valve body.

[0003] The sliding surfaces of the valve seat and valve disc are precisely polished to prevent fluid leakage and to reduce sliding torque. The valve seat and valve disc are injection molded from a sliding synthetic resin to facilitate the formation of complex shapes and to reduce sliding torque.

[0004] However, when the sliding surfaces of the synthetic resin valve seat and valve body are polished, polishing burrs are generated in the grooves and holes formed in the valve seat and valve body, which reduce the opening area of ​​the grooves and holes. The polishing burrs may reduce the flow rate or may come off during use and become stuck in the sliding surfaces. For this reason, it is necessary to remove the polishing burrs.

[0005] Patent Document 1 discloses providing a recessed portion at the opening of the orifice to prevent the opening of the orifice from being narrowed or blocked by grinding burrs. [Prior art documents] [Patent documents]

[0006] [Patent Document 1] Patent No. 5615993 [Patent Document 2] JP 2011-42981 A Summary of the Invention [Problem to be solved by the invention]

[0007] However, while providing a recessed portion at the opening of the orifice as in Patent Document 1 can prevent a decrease in flow rate, it cannot eliminate the generation of grinding burrs, and therefore does not eliminate the risk of the grinding burrs coming off during use. If the grinding burrs get caught in the sliding surface between the valve seat and the valve body, the sliding surface may be scratched and liquid may leak. In addition, in a human body local cleaning device, there is a concern that the peeled off grinding burrs may clog the tip hole of the cleaning nozzle, reducing its function, and may have an effect on the human body.

[0008] When synthetic resin disc valves are polished in this way, polishing burrs are generated at the openings of the grooves and holes. To avoid problems caused by polishing burrs, shot blasting, barrel tumblers, and manual deburring are required, but this increases costs. For example, polishing burrs on the outer periphery of the sliding surface can be removed with a barrel tumbler, but polishing burrs in holes can only be removed by brushing.

[0009] An object of the present invention is to provide a disk valve that does not produce grinding burrs even if it is a disk valve made of synthetic resin for a disk valve device that switches flow paths and flow rates in a refrigerant valve device, a human local cleansing device, etc. [Means for solving the problem]

[0010] The disk valve of the present invention is used in a disk valve device that switches the flow path and flow rate of a fluid, and is a disk valve made of synthetic resin that slides against a mating disk valve, the sliding surface of the disk valve being a polished surface on which at least one recess of a groove or hole into which the fluid is introduced is formed, and the disk valve has an inclined portion around the opening of the recess in the polished surface, the inclined portion being inclined at an angle of 10 degrees to 25 degrees with respect to the polished surface.

[0011] The width of the inclined portion on the polishing surface is characterized by being in the range of 5 μm to 500 μm.

[0012] The disk valve is a molded article of a resin composition, and the resin composition is characterized in that it uses polyphenylene sulfide resin (PPS resin) or polyether ether ketone resin (PEEK resin) as a base resin.

[0013] The resin composition is characterized in that it further contains a polytetrafluoroethylene resin (PTFE resin).

[0014] The resin composition further comprises a spherical filler.

[0015] The resin composition is characterized in that it does not contain a fibrous filler. Effect of the Invention

[0016] The disk valve of the present invention is a disk valve made of synthetic resin, and its sliding surface is a polished surface in which at least one of a groove portion and a hole portion into which a fluid is introduced is formed, and the opening of the recess in the polished surface has an inclined portion inclined at 10 degrees to 25 degrees with respect to the polished surface, so that no grinding burrs are generated. Therefore, problems caused by grinding burrs peeling off during use are eliminated. That is, scratches on the sliding surface caused by grinding burrs biting into the sliding surface of the disk valve and the mating disk valve are prevented, and liquid leakage can be prevented. In addition, for example, when used in a human body local washing device, it is possible to prevent the peeled grinding burrs from clogging the tip hole of the washing nozzle and causing a decrease in function, and further, the effect on the human body is eliminated.

[0017] Since the width of the inclined portion on the polished surface is in the range of 5 μm to 500 μm, unnecessary interference with the mating disk valve can be prevented, and as a result, liquid leakage can be prevented.

[0018] The disc valve is a molded article of a resin composition, which uses PPS resin or PEEK resin as the base resin. As such, the resin composition has excellent sliding properties, low oil absorption and water absorption, excellent oil resistance and water resistance, and is easy to polish.

[0019] Since the resin composition further contains a PTFE resin, the sliding properties can be further improved by polishing or the like.

[0020] Since the resin composition further contains spherical filler, the spherical filler exposed on the sliding surface easily falls off and liquid is retained in the recesses left by the fallen filler, creating a lubricating effect in the liquid, resulting in even better sliding characteristics.

[0021] Since the resin composition does not contain a fibrous filler, the surface roughness of the polished surface can be made uniform, and the quality is stable. [Brief description of the drawings]

[0022] [Figure 1] FIG. [Diagram 2] FIG. [Diagram 3] FIG. 4 is an enlarged cross-sectional view of an inclined portion of a recess; [Figure 4] FIG. [Diagram 5] FIG. 4 is a cross-sectional view of a through hole formed in a disk-shaped molded body. [Figure 6] FIG. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0023] A human body local cleansing device 14 to which the disk valve of the present invention is applied will be described with reference to Fig. 6. The human body local cleansing device 14 comprises a housing 15 having a disk valve device 21 therein as a flow path switching means, and a drive device 16 for driving the flow path switching means in the housing 15. The flow path switching means provided inside the housing 15 is composed of a valve body 1 and a valve seat 2, which will be described later. The housing 15 is also connected to a cleansing water supply device 17 for supplying cleansing water into the housing 15, a human body local cleansing nozzle 18 for spraying the cleansing water supplied from the cleansing water supply device 17 onto the human body locals, a nozzle cleansing water discharge section 19 for cleaning the human body local cleansing nozzle 18, and a drain section 20 from which the cleansing water is discharged.

[0024] The human body local cleansing device 14 is configured to switch the flow path within the housing 15 by driving the flow path switching means inside the housing 15 with a drive device 16, and to flow the cleansing water from the cleansing water supply device 17 to either the human body local cleansing nozzle 18 or the nozzle cleansing water discharge section 19.

[0025] As shown in Fig. 6, in a disk valve device 21, a valve disc 1 (movable disc) and a valve seat 2 (fixed disc) are arranged so that their sliding surfaces can slide freely against each other. The valve disc 1 rotates around the center of its circular shape as the rotation axis, and the holes and grooves of the valve disc 1 and the valve seat 2 overlap or shift with each other, thereby switching the water flow path and flow rate. The disk valve of the present invention may be the valve disc or the valve seat in a disk valve device.

[0026] As an example of the disk valve of the present invention, Fig. 1 shows a valve disc 1 and Fig. 2 shows a valve seat 2. Note that the following description will be given using the valve seat in Fig. 2, but the same applies to the valve disc in Fig. 1. Fig. 2 is illustrated so that the sliding surface that slides against the valve disc can be seen. This sliding surface is a polished surface 3 that has been polished smoothly by a mechanical method such as a double-sided grinder. Hereinafter, the sliding surface will also be referred to as the polished surface.

[0027] As shown in Fig. 2, grooves and holes of various shapes that form a fluid flow path are formed on the sliding surface (polished surface 3) of the valve seat 2. The grooves are recesses that do not penetrate to the non-sliding surface side, and the holes are recesses that penetrate to the non-sliding surface side, and hereinafter the grooves and holes are collectively referred to as recesses 4. The opening periphery 5 of the recess 4 is provided with a slope at a predetermined angle. Here, the opening periphery 5 refers to the boundary area between the polished surface 3 and the inner edge of the recess 4, and means an area with a width of 1 mm or less that exists on the edge of the recess 4 when the polished surface 3 is viewed in a plan view.

[0028] 3 shows an enlarged cross section of the periphery of the opening of the recess 4 of the valve seat 2 (not shown) in the thickness direction of the valve seat 2. The angle θ of the inclined portion 6 around the opening means the interior angle that the inclined portion 6 makes with respect to the sliding surface (polished surface 3).

[0029] The angle θ is 10 degrees to 25 degrees, and preferably 15 degrees to 25 degrees. If the angle θ is less than 10 degrees, it is difficult to control the inclination remaining after polishing, and if it is more than 25 degrees, it is difficult to prevent the generation of polishing burrs. The reason why it is difficult to control the inclined portion remaining after polishing is that the dimension of the width w of the inclined portion remaining on the polished surface changes significantly due to polishing, so high accuracy is required for controlling the amount of polishing. The angle θ may be 10 degrees to 25 degrees, and may be constant around the entire circumference of the recess 4, or may be set to be different depending on the location. It may also be set to be different for each recess.

[0030] The width w of the inclined portion on the polished surface 3 is in the range of 5 μm to 500 μm, preferably in the range of 5 μm to 300 μm, and more preferably in the range of 5 μm to 100 μm. The width w is the horizontal length of the inclined portion 6 when viewed from a cross section in the thickness direction of the valve seat 2, which is divided into the depth direction and the horizontal direction, and is the radial length from the inner edge of the recess 4 when the polished surface 3 is viewed in a plan view. If the width w is smaller than 5 μm, it is difficult to visually confirm the presence or absence of the inclination, and the polishing process takes time. If it is larger than 500 μm, it may cause liquid leakage in some cases. The width w may be constant around the entire circumference of the recess 4, or may be set to be different depending on the location. It may also be set to be different for each recess.

[0031] The disk valve is an injection molded article of a resin composition, and contains a base resin having sliding properties. Examples of the base resin that can be used include polyacetal resin, polyimide resin, polyamide resin, fluororesin, PPS resin, and PEEK resin. In particular, PPS resin and PEEK resin are preferred because they have low oil absorption and water absorption, excellent oil resistance and water resistance, and are easy to polish. The resin composition may be composed of only the base resin (100% base resin), or the base resin may be appropriately mixed with a filler such as the solid lubricant or spherical filler described below.

[0032] As the filler, it is preferable to mix a solid lubricant such as graphite, molybdenum disulfide, or PTFE resin in order to improve the lubrication properties. Among them, PTFE resin is preferable because of its excellent lubricity. The solid lubricant can be mixed in an amount of 5 to 60 parts by weight, preferably 10 to 45 parts by weight, and more preferably 20 to 30 parts by weight, per 100 parts by weight of the base resin. If it is less than 5 parts by weight, it is difficult to obtain an improved lubricity effect, and if it exceeds 60 parts by weight, it is difficult to prevent the occurrence of polishing burrs even if an inclination of 10 degrees to 25 degrees is formed with respect to the polishing surface.

[0033] In addition, by including spherical fillers such as spherical graphite and glass beads as fillers, the sliding properties in liquid can be stabilized. The reason for this is that the spherical fillers are ground into hemispheres by polishing, which makes them more likely to fall off from the sliding surface, and the hemispherical spherical fillers exposed on the sliding surface fall off by post-treatment such as barrel tumbler, and liquid is held in the recesses of the fallen fillers during use, resulting in a lubricating effect in liquid. The amount of the spherical fillers is 5 to 30 parts by weight, preferably 5 to 20 parts by weight, based on 100 parts by weight of the base resin. If it is less than 5 parts by weight, it is difficult to obtain an improved lubricity effect, and if it exceeds 30 parts by weight, the wear resistance may decrease.

[0034] As the spherical filler, glass beads are preferably used. The average particle size of the glass beads is not particularly limited, but is preferably 5 μm to 100 μm, and more preferably 5 μm to 50 μm. The average particle size of the glass beads is, for example, a number average particle size calculated from the particle size measured by extracting the glass beads to be measured from an image obtained by observation with an electron microscope.

[0035] Furthermore, the resin composition preferably does not contain a fibrous filler such as glass fiber, carbon fiber, etc. If a fibrous filler is contained, there is a risk that the surface roughness after polishing will become non-uniform.

[0036] Considering these points, the resin composition for forming the disk valve is particularly preferably one that contains a PPS resin or PEEK resin as a base resin, 20 to 30 parts by weight of PTFE resin, 5 to 20 parts by weight of glass beads, and no fibrous filler, per 100 parts by weight of the base resin.Furthermore, it is preferable that the average particle size of the glass beads is 5 μm to 50 μm.

[0037] The disk valve device of the present invention is a synthetic resin disk valve device that switches the flow path and flow rate of a fluid, and is composed of a valve body and a valve seat that slide against each other, and each sliding surface of the valve body and the valve seat is a polished surface on which at least one of a groove and a hole into which the fluid is introduced is formed, and the valve body and the valve seat have an inclined portion inclined at 10 degrees to 25 degrees with respect to the polished surface around the opening of the recess in each polished surface. In this case, the valve body and the valve seat are each composed of the above-mentioned disk valve of the present invention.

[0038] In the disk valve device of the present invention, the valve body and the valve seat are both molded bodies of a resin composition. The resin compositions may be the same or different from each other. Different resin compositions mean that the compositions are different, and include not only cases where the raw materials constituting the valve body and the valve seat are different, but also cases where the raw materials are the same but have different composition ratios. For example, the base resin of the valve body may be PPS resin, and the base resin of the valve seat may be PEEK resin. EXAMPLES

[0039] In order to investigate the relationship between the angle of inclination of the periphery of the opening of the recess with respect to the polished surface of the disc valve and the occurrence of polishing burrs, the following test was carried out using a disc-shaped molded body simulating a disc valve.

[0040] Test Example 1 An injection molded body (diameter Φ20mm, thickness 4mm) was obtained by injection molding using a resin composition containing 100 parts by weight of PPS resin, 25 parts by weight of PTFE resin, and 15 parts by weight of glass beads (average particle size 20-30μm). Both sides of the obtained injection molded body were polished by a predetermined amount using a double-sided grinder. After polishing, the abrasive grains adhering to the surface of the injection molded body were removed by barrel polishing to obtain a disk-shaped molded body.

[0041] Figure 4 shows plan views of the front and back of the obtained disk-shaped molded product. Here, the surface on which the inclined portions are formed in Examples 1 to 4 and Comparative Examples 1 and 2 described below is referred to as the front, and the surface on which the inclined portions are formed in Comparative Examples 3 to 8 is referred to as the back. Figure 4(a) is the front view, and Figure 4(b) is the back view. As shown in FIG. 4, the front and back surfaces of the disk-shaped molded body 7 are each formed with through holes (recesses) 8-13 having a diameter of 1.5 mm, and the periphery of the opening of each of the front and back surfaces of the through holes 8-13 is inclined at a predetermined angle shown in Table 1 with respect to the surface.

[0042] 5 shows, as an example of a cross-sectional view of a through hole, a cross section in the thickness direction of the disc-shaped molded body 7 of the through hole 12 in which the inclined portion of Comparative Example 1 is formed. The inclined portion of Comparative Example 1 is formed on the front side of the through hole 12, and the inclined portion of Comparative Example 5 is formed on the back side. Note that the angle of inclination of the polished surface after polishing does not change before and after polishing because the surface before polishing is polished horizontally.

[0043] The presence or absence of polishing burrs on each inclined portion of the disk-shaped molded body 7 was confirmed using a microscope (magnification: 100 times). The results are shown in Table 1.

[0044] [Table 1]

[0045] The presence or absence of grinding burrs on the inclined portion was evaluated by counting the number of disk-shaped molded products having grinding burrs out of 10 for each test, and judging based on the following criteria. 〇: No burrs after polishing △: 1 to 9 polishing burrs ×: All pieces have burrs

[0046] As shown in Table 1, by forming an inclined portion at an angle of 10 degrees to 25 degrees with respect to the polished surface around the opening of the through hole as a recess in the polished surface, the generation of polishing burrs could be prevented.

[0047] Test Example 2 Next, an injection molded body was molded using a PEEK resin not containing a filler (a resin composition consisting of only PEEK resin) in the same mold as in Test Example 1. This injection molded body was polished on both sides in the same manner as in Test Example 1, and abrasive grains adhering to the surface of the injection molded body were removed by barrel polishing. The obtained disk-shaped molded body was observed under a microscope (magnification 100 times) to confirm the presence or absence of polishing burrs on each inclined portion. As a result of the confirmation, it was confirmed that the state of the polishing burrs had exactly the same tendency as in Table 1. [Industrial Applicability]

[0048] The disk valve of the present invention is a disk valve made of synthetic resin, but does not produce burrs that occur when polishing a flat surface, eliminating problems caused by burrs peeling off during use. It can therefore be widely used as a disk valve for refrigerant valve devices, human local cleansing devices, etc. [Explanation of symbols]

[0049] 1 Valve body (disc valve) 2 Valve seat (disc valve) 3 Polished surface 4 Recess 5. Opening perimeter 6 Slope 7 Disc-shaped molding 8~13 Through holes 14. Human body part washing device 15. Cabinet 16 Drive unit 17 Cleaning water supply device 18. Body part washing nozzle 19 Cleaning water discharge section 20 Drainage section 21 Disc valve device

Claims

1. A synthetic resin disk valve used in a disk valve device that switches the flow path and flow rate of a fluid and slides against a mating disk valve, the sliding surface of the disk valve is a polished surface having at least one recess of a groove or a hole into which the fluid is introduced; The disk valve is characterized in that the polishing surface has an inclined portion around the opening of the recess, the inclined portion being inclined at an angle of 10 degrees to 25 degrees with respect to the polishing surface, thereby preventing the occurrence of polishing burrs around the opening, and therefore no polishing burrs are present on the inclined portion after polishing.

2. 2. The disk valve according to claim 1, wherein the width of the inclined portion on the polished surface is in the range of 5 μm to 500 μm.

3. The disk valve is a molded article of a resin composition, 3. The disk valve according to claim 1, wherein the resin composition has a base resin selected from the group consisting of polyphenylene sulfide resin and polyether ether ketone resin.

4. 4. The disk valve according to claim 3, wherein the resin composition further contains a polytetrafluoroethylene resin.

5. 5. The disk valve according to claim 3, wherein the resin composition further contains a spherical filler.

6. 6. The disk valve according to claim 3, wherein the resin composition does not contain a fibrous filler.

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