Water-saving tools

Abstract

Not only does it provide sufficient water-saving effects, it also reduces noise and vibrations when water flows through it, and prevents clogging caused by foreign matter such as red rust and limescale. [Solution] A water-saving device 1 that is incorporated into a faucet, shower head, pipe, pipe joint, or valve to reduce the amount of water flow, the water-saving device 1 having a cylindrical water-saving portion 1a and The flange 1b is integrally formed on the outer peripheral surface of the inlet side of the water-saving section 1a, and the protrusion 1c is integrally formed on the end surface of the inlet side of the water-saving section 1a and protrudes upstream of the water-saving section 1a. At least two through-holes 1d are formed in the protrusion 1c and the water-saving portion 1a from the surface of the protrusion 1c toward the outlet end face of the water-saving portion 1a.

Description

[Technical Field]

[0001] This invention relates to an improvement to a water-saving device that is installed inside a kitchen or bathroom faucet, a bathroom shower head, a water supply pipe, a pipe joint, a toilet flush valve, etc., to reduce the amount of water used and achieve a water-saving effect. This water-saving device not only achieves sufficient water-saving effects, but also reduces noise and vibration when water flows through, and prevents clogging due to foreign matter such as red rust and limescale. [Background technology]

[0002] Conventionally, this type of water-saving device has thin, through-holes to restrict the amount of water flowing through, and known water-saving devices include those with a flat, planar inlet end face (e.g., Patent Document 1) and those with a concave inlet end face (e.g., Patent Document 2).

[0003] That is, as shown in Figure 11, the former water-saving device 10 consists of a cylindrical water-saving section 10a and a flange section 10b formed integrally on the outer peripheral surface of the inlet side of the water-saving section 10a, and two water-passing holes 10c are formed in the water-saving section 10a in a flared shape, penetrating from the inlet side to the outlet side.

[0004] As shown in Figure 12, the latter water-saving device 10 comprises a cylindrical water-saving section 10a and a flange section 10b formed integrally with the inlet-side outer peripheral surface of the water-saving section 10a. Recesses 10d are formed on the inlet-side end face and outlet-side end face of the water-saving section 10a, respectively, and the inlet-side recess 10d and the outlet-side recess 10d are connected by two water-passing holes 10c.

[0005] Both of the water-saving devices 10 are incorporated into faucets, shower heads, etc., and are capable of reducing the amount of water used by passing water through narrow water holes 10c.

[0006] However, the former water-saving device 10 has a flat inlet end face, so when the flowing water enters the water passage hole 10c of the water-saving device 10, most of the water collides perpendicularly with the flat inlet end face of the water-saving device 10, causing impact noise and vibration. In particular, when the water pressure is high, this impact noise and vibration become louder, and the noise and vibration when water flows can become annoying. Furthermore, the former water-saving device 10 has a problem in that the inlet opening of the narrow water-passing hole 10c is formed on the flat inlet end surface of the water-saving section 10a, making it difficult for water to flow smoothly into the water-passing hole 10c.

[0007] On the other hand, the latter water-saving device 10 has an inlet opening of the water passage 10c formed in a recess 10d on the inlet end face of the water-saving section 10a. This allows the flowing water to smoothly pass through the recess 10d and into the water passage 10c. However, if foreign matter such as rust or limescale that is larger than the inner diameter of the water passage 10c flows in, the foreign matter will accumulate in the recess 10d and clog the water passage 10c. In this case, problems such as a significant drop in the amount of water discharged or no water coming out will occur. [Prior art documents] [Patent documents]

[0008] [Patent Document 1] Registered Utility Model No. 2562283 [Patent Document 2] Registered Utility Model No. 3006850 Summary of the Invention [Problem to be solved by the invention]

[0009] The present invention was made in consideration of these problems, and its purpose is to provide a water-saving device that not only provides sufficient water-saving effects, but also reduces noise and vibration when water flows through it, and prevents clogging due to foreign matter such as red rust and limescale. [Means for solving the problem]

[0010] In order to achieve the above object, the invention of claim 1 of the present invention is a water-saving device that is incorporated into a faucet, shower head, pipe, pipe joint, or valve to reduce the amount of water used, the water-saving device comprising a cylindrical water-saving section, a flange portion integrally formed on the outer peripheral surface of the inlet side of the water-saving section, and a protrusion formed integrally on the inlet side end surface of the water-saving section and protruding upstream of the water-saving section, the protrusion and the water-saving section having at least two through-holes formed from the surface of the protrusion toward the outlet side end surface of the water-saving section, and at least one of the water-saving section (1a), flange portion (1b), and protrusion (1c) being made of resin. The resin is, for example, polycarbonate.

[0011] The invention of claim 2 of the present invention is a water-saving device that is incorporated into a faucet, shower head, pipe, pipe joint, or valve to reduce the amount of water used, and the water-saving device comprises a cylindrical water-saving section, a flange section formed integrally with the outer peripheral surface of the inlet side of the water-saving section, and a protrusion formed integrally with the inlet side end surface of the water-saving section and protruding upstream of the water-saving section, and a single through-hole is formed in the protrusion and water-saving section from the top of the protrusion to the outlet side end surface of the water-saving section, and at least one of the water-saving section (1a), flange section (1b), and protrusion (1c) is formed from resin. The resin is, for example, polycarbonate.

[0012] The invention of claim 3 of the present invention is characterized in that, in the invention described in claim 1 or claim 2, the shape of the protrusion is conical or hemispherical, and the protrusion is formed at a position on the axis of the water-saving section.

[0013] The invention of claim 4 of the present invention is characterized in that in the invention described in claim 1, at least two water passage holes are arranged parallel to the axis of the water-saving section and at equal angular intervals around the axis of the water-saving section.

[0014] The invention of claim 5 of the present invention is characterized in that in the invention described in claim 1, at least two water passage holes are arranged at equal angular intervals around the axis of the water-saving section and in a diverging pattern.

[0015] The invention of claim 6 of the present invention is characterized in that, in the invention described in claim 1, at least two water passage holes are arranged at equal angular intervals around the axis of the water-saving section and in a diverging pattern, and the inlet opening and outlet opening of each water passage hole are positioned circumferentially of the protrusion and the water-saving section and offset in the same direction. [Effects of the Invention]

[0016] The water-saving device according to claim 1 or claim 2 of the present invention is configured such that a protrusion is formed on the inlet end face of a cylindrical water-saving section, protruding toward the upstream side of the water-saving section, and the protrusion and the water-saving section are each formed with at least two through-holes extending from the surface of the protrusion toward the outlet end face of the water-saving section, or one through-hole extending from the top of the protrusion toward the outlet end face of the water-saving section.When the water-saving device is incorporated into a faucet, shower head, etc. and water is turned on, the water passes through the two water-passage holes of the water-saving device, which increases the water flow rate, providing a feel that is no different from conventional use, and also reducing the amount of water used, resulting in a sufficient water-saving effect. Furthermore, the water-saving device according to claim 1 or 2 of the present invention has a protrusion on the inlet end face of the water-saving section, and the inlet opening of the water passage hole is formed on the surface or top of the protrusion, so even if foreign matter such as red rust or limescale larger than the inner diameter of the water passage hole flows in, the foreign matter will not remain on the protrusion but will slide off the protrusion and remain at the base end of the protrusion. As a result, the inlet opening of the water passage hole of the water-saving device according to claim 1 or 2 of the present invention is less likely to become clogged with foreign matter such as red rust, reducing the occurrence of problems such as a significant decrease in the amount of water discharged or a lack of water.

[0017] In addition to the above-mentioned effects, the water-saving devices according to claims 3 to 6 of the present invention can also achieve the following excellent effects. In other words, the water-saving device according to claim 3 of the present invention has a conical or hemispherical protrusion formed on the inlet end face of the water-saving section, and the inlet opening of the water passage hole is formed on the surface or top of the protrusion. Therefore, when the flowing water enters the water passage hole, some of the water collides with the inclined conical or hemispherical surface of the protrusion, slowing down the water, reducing the collision noise and impact, and reducing noise and impact when the water passes through.

[0018] The water-saving device according to claim 4 of the present invention has at least two water holes that are parallel to the axis of the water-saving section and are arranged at equal angular intervals around the axis of the water-saving section, thereby achieving a sufficient flow rate and reducing the amount of water without changing the force of the water. Furthermore, even if one water hole is blocked by foreign matter such as red rust, the amount of water will not drop to zero.

[0019] The water-saving device according to claim 5 of the present invention has at least two water-passing holes arranged at equal angular intervals around the axis of the water-saving part and diverging toward the end, so that the water discharged from each water-passing hole spreads and flows along the inner wall surface of the spout, etc., so that the water flow is less turbulent, has a rectifying effect, and does not generate noise or vibration. Furthermore, even though the water volume is restricted by the water-passing holes, the lack of water volume is not visually perceived.

[0020] The water-saving device according to claim 6 of the present invention has at least two water-passing holes arranged at equal angular intervals around the axis of the water-saving part and diverging toward the end, and the inlet and outlet openings of each water-passing hole are arranged circumferentially around the protrusion and the water-saving part and offset in the same direction, so that the water discharged from each water-passing hole is twisted into a spiral flow, eliminating noise. Furthermore, even though the water volume is restricted by the water-passing holes, the water can be sufficiently diffused within the spout, etc., so that the visual impression of a small amount of water is not given. [Brief explanation of the drawings]

[0021] [Figure 1] 1 shows a water-saving device according to a first embodiment of the present invention, in which (A) is an enlarged front view of the water-saving device, (B) is an enlarged side view of the water-saving device, (C) is an enlarged plan view of the water-saving device, and (D) is an enlarged bottom view of the water-saving device. [Figure 2] FIG. 2 is a cross-sectional view taken along line I-I in FIG. [Figure 3] FIG. 2 is a cross-sectional view taken along line 1-1 in FIG. [Figure 4] FIG. 2 is an exploded perspective view showing the position where the water-saving device is installed in the faucet. [Figure 5] 1 shows a water-saving device according to a second embodiment of the present invention, in which (A) is an enlarged front view of the water-saving device, (B) is an enlarged side view of the water-saving device, (C) is an enlarged plan view of the water-saving device, and (D) is an enlarged bottom view of the water-saving device. [Figure 6] FIG. 5(B) is a cross-sectional view taken along line H-H in FIG. 5(C). [Figure 7] 1 shows a water-saving device according to a third embodiment of the present invention, in which (A) is an enlarged front view of the water-saving device, (B) is an enlarged side view of the water-saving device, (C) is an enlarged plan view of the water-saving device, and (D) is an enlarged bottom view of the water-saving device. [Figure 8] FIG. 7(C) is a cross-sectional view taken along line 2-2 of FIG. [Figure 9] 10A shows a water-saving device according to a fourth embodiment of the present invention, in which (A) is an enlarged front view of the water-saving device, (B) is an enlarged plan view of the water-saving device, and (C) is an enlarged bottom view of the water-saving device. [Figure 10] FIG. 9B is a cross-sectional view taken along the line HO-HO in FIG. [Figure 11] FIG. 10 is an enlarged front view of a conventional water-saving device. [Figure 12] FIG. 10 is an enlarged vertical cross-sectional view showing another example of a conventional water-saving device. DETAILED DESCRIPTION OF THE INVENTION

[0022] DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. 1 to 3 show a water-saving device 1 according to a first embodiment of the present invention. The water-saving device 1 is integrally formed from a metal material such as brass, stainless steel, or bronze, or a plastic material such as polyvinyl chloride, polyester, or polypropylene. The water-saving device 1 comprises a cylindrical water-saving section 1a, a flange section 1b integrally formed on the inlet-side outer peripheral surface of the water-saving section 1a (the outer peripheral surface of the upper end of the water-saving section 1a shown in FIG. 1(A)), and a protrusion 1c integrally formed on the inlet-side end surface of the water-saving section 1a (the upper end surface of the water-saving section 1a shown in FIG. 1(A)) and protruding toward the upstream side of the water-saving section 1a (the upper side of FIGS. 1(A) and (B)). Two through-holes 1d are formed in the protrusion 1c and the water-saving section 1a, extending from the surface of the protrusion 1c toward the outlet-side end surface of the water-saving section 1a (the lower end surface of the water-saving section 1a shown in FIG. 1(A)).

[0023] In this embodiment, the water-saving portion 1a, the flange portion 1b, and the protrusion portion 1c are all molded (formed) from a resin, for example, polycarbonate. At least one of the water-saving portion (1a), the flange portion (1b) and the protrusion (1c) may be made of polycarbonate. In this way, by using polycarbonate, it is possible to realize a water-saving device that is durable, lightweight, and weather-resistant, and is also environmentally friendly. In addition, the use of polycarbonate allows for flexible formation of a variety of shapes, enhancing design and functionality. The flange portion 1b is for fixing the water-saving device 1 inside a faucet, shower head, or the like, and is attached to the inside of the faucet or the base of the shower head via a packing.

[0024] The protrusion 1c is formed in a conical shape slightly smaller than the outer diameter of the water-saving portion 1a, and is formed on the inlet end face of the water-saving portion 1a and on the axis a of the water-saving portion 1a.

[0025] Furthermore, the two water passage holes 1d are formed with the same inner diameter, are parallel to the axis a of the water-saving section 1a, and are disposed at equal angular intervals around the axis a of the water-saving section 1a. Therefore, the inlet openings of the two water passage holes 1d are concentrically arranged at intervals of 180° on the surface of the conical protrusion 1c, and the outlet openings of the two water passage holes 1d are concentrically arranged at intervals of 180° on the outlet end face of the water-saving section 1a, facing the inlet openings.

[0026] In the first embodiment, the diameter of the water-saving section 1a is set to 12 mm, the outer diameter of the flange section 1b is set to 15.5 mm, the inner diameter of each water passage hole 1d is set to 5 mm, the outer diameter of the base end of the conical protrusion 1c is set to 9.5 mm, the inclination angle of the surface of the conical protrusion 1c is set to 20°, and the thickness of the water-saving section 1a is set to 7 mm.

[0027] When using the water-saving device 1 configured in this manner, it can be incorporated into the inside of a faucet in a kitchen or bathroom, the inside of the base of a bathroom shower head, the inside of a water supply pipe, etc. For example, when using the water-saving device 1 with a faucet 2 of a general structure, the water-saving device 1 can be incorporated into the connection between the faucet body 2a and the spout 2b of the faucet 2, as shown in Figure 4.

[0028] Thus, with the faucet 2 incorporating the water-saving device 1 of the above-described configuration, when the faucet 2 is opened, water passes through the two water holes 1d of the water-saving device 1, which increases the water flow rate, providing a feeling of use that is the same as conventional devices, while also reducing the amount of water used and achieving a sufficient water-saving effect. Furthermore, the water-saving device 1 has a conical protrusion 1c formed on the inlet end face of the water-saving section 1a, and the inlet opening of the water passage hole 1d is formed on the surface of the protrusion 1c. Therefore, when water flows into the water passage hole 1d, a portion of the water collides with the inclined conical surface of the protrusion 1c, thereby slowing down the water, reducing the collision noise and impact and reducing noise and impact when the water flows through. Furthermore, in this water-saving device 1, the inlet opening of the water passage hole 1d is formed on the surface of a conical protrusion 1c formed on the inlet end face of the water-saving section 1a, so even if foreign matter such as red rust or limescale that is larger than the inner diameter of the water passage hole 1d flows in, the foreign matter will not remain on the protrusion 1c but will slide off the protrusion 1c and remain on the base end side of the protrusion 1c. As a result, in this water-saving device 1, the inlet opening of the water passage hole 1d is less likely to be blocked by foreign matter such as red rust, and problems such as a significant decrease in the amount of water discharged or a lack of water coming out are less likely to occur.

[0029] Figures 5 and 6 show a water-saving device 1 according to a second embodiment of the present invention. This water-saving device 1 is integrally formed from the same metal or plastic material as the water-saving device 1 shown in Figure 1, and comprises a cylindrical water-saving section 1a, a flange 1b integrally formed on the outer periphery of the inlet side of the water-saving section 1a, and a protrusion 1c integrally formed on the inlet side end face of the water-saving section 1a and protruding upstream of the water-saving section 1a. Two through-holes 1d are formed in the protrusion 1c and the water-saving section 1a from the surface of the protrusion 1c toward the outlet side end face of the water-saving section 1a. In this water-saving device 1, the two water-holes 1d are inclined with respect to the axis a of the water-saving section 1a, and the configurations of the water-saving section 1a, flange 1b, and protrusion 1c are similar to those of the water-saving device 1 shown in Figure 1.

[0030] The two water passage holes 1d are formed with the same inner diameter and are arranged at equal angular intervals around the axis a of the water-saving section 1a, diverging toward the end. Therefore, the inlet openings of the two water passage holes 1d are arranged concentrically at 180° intervals on the surface of the conical protrusion 1c and close to the axis a of the water-saving section 1a, and the outlet openings of the two water passage holes 1d are arranged concentrically at 180° intervals on the outlet-side end face of the water-saving section 1a and spaced apart from the axis a of the water-saving section 1a.

[0031] In the second embodiment, the diameter of the water-saving section 1a is set to 11 mm, the outer diameter of the flange section 1b is set to 15.5 mm, the inner diameter of each water passage hole 1d is set to 4 mm, the outer diameter of the base end of the conical protrusion 1c is set to 7.5 mm, the inclination angle of the surface of the conical protrusion 1c is set to 20°, and the thickness of the water-saving section 1a is set to 7 mm.

[0032] The water-saving device 1 configured as described above can achieve the same effects as the water-saving device 1 shown in Fig. 1. Moreover, because the two water-passing holes 1d in this water-saving device 1 are formed in a diverging shape, the water discharged from each water-passing hole 1d spreads and flows along the inner wall surface of the spout 2b, etc., resulting in little disturbance to the water flow, a rectifying effect, and no noise or vibration. Furthermore, even though the water volume is restricted by the water-passing holes 1d, the lack of water volume is not visually perceived.

[0033] 7 and 8 show a water-saving device 1 according to a third embodiment of the present invention. This water-saving device 1 is integrally formed from the same metal or plastic material as the water-saving device 1 shown in Fig. 1, and comprises a cylindrical water-saving section 1a, a flange 1b integrally formed on the outer periphery of the inlet side of the water-saving section 1a, and a protrusion 1c integrally formed on the inlet side end face of the water-saving section 1a and protruding upstream of the water-saving section 1a. Two through-holes 1d are formed in the protrusion 1c and the water-saving section 1a from the surface of the protrusion 1c toward the outlet side end face of the water-saving section 1a. In this water-saving device 1, the two water-passing holes 1d are inclined with respect to the axis a of the water-saving section 1a and twisted circumferentially around the water-saving section 1a. The configurations of the water-saving section 1a, flange 1b, and protrusion 1c are similar to those of the water-saving device 1 shown in Fig. 1.

[0034] The two water passage holes 1d are formed with the same inner diameter and are arranged at equal angular intervals around the axis a of the water-saving section 1a, diverging toward the end, with the inlet and outlet openings of each water passage hole 1d being arranged circumferentially of the protrusion 1c and the water-saving section 1a and offset in the same direction. Therefore, the inlet openings of the two water passage holes 1d are arranged concentrically at 180° intervals on the surface of the conical protrusion 1c and close to the axis a of the water-saving device 1, and the outlet openings of the two water passage holes 1d are arranged concentrically at 180° intervals on the outlet-side end face of the water-saving section 1a, spaced apart from the axis a of the water-saving section 1a and offset in the circumferential direction of the water-saving section 1a.

[0035] In the third embodiment, the diameter of the water-saving section 1a is set to 11 mm, the outer diameter of the flange section 1b is set to 15.5 mm, the inner diameter of each water-passing hole 1d is set to 2.8 mm, the outer diameter of the base end of the conical protrusion 1c is set to 7.5 mm, the inclination angle of the surface of the conical protrusion 1c is set to 20°, the thickness of the water-saving section 1a is set to 7 mm, and the twist angle of each water-passing hole 1d is set to 20°.

[0036] The water-saving device 1 configured as described above can achieve the same effects as the water-saving device 1 shown in Fig. 1. Moreover, in this water-saving device 1, the two water-passage holes 1d are formed in a divergent shape and twisted in the same direction, so the water discharged from each water-passage hole 1d is twisted to form a spiral water flow, eliminating noise. Furthermore, even though the water volume is restricted by the water-passage holes 1d, the water can be sufficiently diffused within the spout 2b, etc., so the lack of water volume is not perceived visually.

[0037] 9 and 10 show a water-saving device 1 according to a fourth embodiment of the present invention. This water-saving device 1 is integrally formed from the same metal or plastic material as the water-saving device 1 shown in Fig. 1, and comprises a cylindrical water-saving section 1a, a flange 1b integrally formed on the inlet-side outer periphery of the water-saving section 1a, and a protrusion 1c integrally formed on the inlet-side end face of the water-saving section 1a and protruding upstream of the water-saving section 1a. A single through-hole 1d is formed in the protrusion 1c and the water-saving section 1a, extending from the top of the protrusion 1c to the outlet-side end face of the water-saving section 1a. This water-saving device 1 has only one water-passing hole 1d formed at the axis a of the water-saving section 1a, extending from the top of the protrusion 1c to the outlet-side end face of the water-saving section 1a. The configurations of the water-saving section 1a, flange 1b, and protrusion 1c are similar to those of the water-saving device 1 shown in Fig. 1.

[0038] In the fourth embodiment, the diameter of the water-saving portion 1a is set to 11 mm, the outer diameter of the flange portion 1b is set to 15.5 mm, the inner diameter of the water passage hole 1d is set to 8 mm, the outer diameter of the base end of the conical protrusion 1c is set to 12 mm, the inclination angle of the surface of the conical protrusion 1c is set to 20°, and the thickness of the water-saving portion 1a is set to 7 mm.

[0039] The water-saving device 1 having the above-described configuration can also achieve the same effects as the water-saving device 1 shown in FIG.

[0040] 1 to 8, two through-holes 1d are formed in the protrusion 1c and the water-saving portion 1a from the surface of the protrusion 1c toward the outlet end face of the water-saving portion 1a, but in other embodiments (not shown), three or four through-holes 1d may be formed in the protrusion 1c and the water-saving portion 1a from the surface of the protrusion 1c toward the outlet end face of the water-saving portion 1a. In this case, the water-holes 1d are naturally arranged at equal angular intervals around the circumference of the water-saving portion 1a.

[0041] In the first, second, third and fourth embodiments shown in Figures 1 to 10, the shape of the protrusion 1c is conical, but in other embodiments, although not shown, the shape of the protrusion 1c may be hemispherical.

[0042] In the first, second, third and fourth embodiments shown in Figures 1 to 10, straight water passage holes 1d are formed in the protrusion 1c and the water-saving section 1a, but in other embodiments, although not shown, tapered water passage holes 1d may be formed whose inner diameter gradually increases from the inlet side to the outlet side.

[0043] In the second embodiment shown in Fig. 5, two water passage holes 1d with an inner diameter of 4 mm are formed in the protrusion 1c and the water-saving portion 1a, but the inner diameter of the water passage holes 1d is not limited to this. For example, two water passage holes 1d with an inner diameter of 3 mm or 3.5 mm may be formed in the protrusion 1c and the water-saving portion 1a.

[0044] In the third embodiment shown in Fig. 7, two water passage holes 1d with an inner diameter of 2.8 mm are formed in the protrusion 1c and the water-saving portion 1a, but the inner diameter of the water passage holes 1d is not limited to this. For example, two water passage holes 1d with an inner diameter of 1.8 mm, 2.0 mm, 2.2 mm, or 2.5 mm may be formed in the protrusion 1c and the water-saving portion 1a.

[0045] In the first, second, third and fourth embodiments shown in Figures 1 to 10, the diameter of the water-saving portion 1a is set to 11 mm or 12 mm, the outer diameter of the flange portion 1b is set to 15.5 mm, the outer diameter of the base end side of the conical protrusion 1c is set to 7.5 mm, 9.5 mm or 12 mm, the inclination angle of the surface of the conical protrusion 1c is set to 20°, and the thickness of the water-saving portion 1a is set to 7 mm, but the dimensions of the water-saving device 1 are not limited to these and may, of course, be changed as appropriate depending on the installation position of the water-saving device 1 and the amount of water saved. [Explanation of symbols]

[0046] 1 is a water-saving device, 1a is a water-saving portion, 1b is a flange portion, 1c is a protrusion, 1d is a water passage hole, and a is the axis of the water-saving portion.

Claims

1. A water-saving device (1) that is incorporated into a faucet, shower head, pipe, pipe joint, or valve to reduce the amount of water used. The water-saving device (1) is A cylindrical water-saving portion (1a); a flange portion (1b) formed integrally with the inlet side outer peripheral surface of the water-saving portion (1a); a protrusion (1c) formed integrally with the inlet end surface of the water-saving portion (1a) and protruding toward the upstream side of the water-saving portion (1a), At least two through-holes (1d) are formed in the protrusion (1c) and the water-saving portion (1a) from the surface of the protrusion (1c) toward the outlet end face of the water-saving portion (1a), At least one of the water-saving portion (1a), flange portion (1b) and protrusion portion (1c) is made of resin. A water-saving device characterized by:

2. The resin is polycarbonate. The water-saving device according to claim 1.

3. A water-saving device (1) that is incorporated into a faucet, shower head, pipe, pipe joint, or valve to reduce the amount of water used. The water-saving device (1) is A cylindrical water-saving portion (1a); a flange portion (1b) formed integrally with the inlet side outer peripheral surface of the water-saving portion (1a); a protrusion (1c) formed integrally with the inlet end surface of the water-saving portion (1a) and protruding toward the upstream side of the water-saving portion (1a), A single through-hole (1d) is formed in the protrusion (1c) and the water-saving portion (1a) from the top of the protrusion (1c) to the outlet end face of the water-saving portion (1a), At least one of the water-saving portion (1a), flange portion (1b) and protrusion portion (1c) is made of resin. A water-saving device characterized by:

4. The resin is polycarbonate. The water-saving device according to claim 3.

5. The shape of the protrusion (1c) is conical or hemispherical, and the protrusion (1c) is formed on the axis (a) of the water-saving portion (1a). The water-saving device according to claim 1,

6. At least two water passage holes (1d) are parallel to the axis (a) of the water-saving section (1a) and are arranged at equal angular intervals around the axis (A) of the water-saving section (1a). The water-saving device according to claim 1,

7. At least two water holes (1d) are arranged at equal angular intervals around the axis (a) of the water-saving section (1a) and in a diverging pattern. The water-saving device according to claim 1,

8. At least two water passage holes (1d) are arranged at equal angular intervals around the axis (a) of the water-saving portion (1a) and diverge toward the end, and the inlet opening and the outlet opening of each water passage hole (1d) are arranged in the circumferential direction of the protrusion (1c) and the water-saving portion (1a) and are shifted in the same direction.

2. The water-saving device according to claim 1.

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