Hot and cold water mixing faucet

Abstract

A hot and cold water mixing faucet that can easily form an appropriate sealing structure is provided. The hot and cold water mixing faucet (1) comprises a cylinder (2), a hot water supply port (21), a cold water supply port (22), a mixing portion (3), a first discharge port (23), a second discharge port (24), and a switching valve (4). The switching valve (4) comprises a switching outer cylinder (41) and a switching inner cylinder (42), and a guide passage (41c) is provided between the cylinder (2) and the switching outer cylinder (41) for guiding water discharged from the cold water supply port (22) to the mixing portion (3). The switching outer cylinder (41) has a first connecting hole (41a) and a second connecting hole (41b), and the switching inner cylinder (42) has a first selection hole (42a) and a second selection hole (42b). The inner circumferential surface of the cylinder (2) and the outer circumferential surface of the switching outer cylinder (41) are inclined so that the first annular seal (51) and the second annular seal (52) provided between the cylinder (2) and the switching outer cylinder (41) are inclined in a manner gradually approaching the central axis of the cylinder (2) relative to the insertion direction of the switching valve (4) into the cylinder (2).

Description

Technical Field

[0001] The invention relates to a hot and cold water mixing faucet. Background Art

[0002] In the past, there is a known hot and cold water mixing faucet that can adjust the mixing ratio of hot and cold water and discharge it (see, for example, Patent Document 1). Hot and cold water mixing faucets are generally installed in kitchens, bathrooms, hotel bathrooms, and toilets in department stores, airports, etc.

[0003] The shape of a hot and cold water mixing faucet itself is not to mention, and in some cases, a sense of luxury is also required in order to enhance the atmosphere of various installation locations.

[0004] In addition, by molding the cylindrical body as the outer shell, the requirements for strength against excessive water pressure generated when water hammer occurs, etc., and the requirements for durability against rapid temperature changes caused by cold water and hot water are fully met.

[0005] However, when the cylinder is molded, a hot and cold water mixing unit, a switching valve for switching faucets and showers, etc. are built into the cylinder, and the inner circumferential surface of the cylinder is used as a hot water side passage, a cold water side passage, and a mixed hot and cold water passage. Therefore, in order to ensure the sealing, the assembly of the hot and cold water mixing unit, and the formation of the passage, various mechanical processing is required inside the shell.

[0006] For example, if the casting surface is used as it is, sealing cannot be ensured, the hot and cold water mixing part cannot be assembled, or a uniform passage cannot be formed. Therefore, cutting, turning, grinding, etc. are required inside the cylinder to form holes for accommodating the hot and cold water mixing part, grooves for arranging O-rings, etc.

[0007] Machining such as cutting, turning, and grinding of holes and grooves can be easily performed on the outside of the cylinder, but the tools used are limited inside the cylinder, and so-called deburring must be performed inside, which requires special tools and complicated manufacturing processes. In other words, complicated machining must be performed inside the cylinder.

[0008] In addition, the cylinder formed by the casting is heavier than it seems, and the weight needs to be considered in its transportation / handling and installation works. Moreover, the heat capacity of the casting is small and lacks heat insulation. Therefore, if a hot water flow path is provided inside the cylinder, the temperature of the cylinder surface may be locally high, making it difficult to use. Therefore, it is required to design a mixing part at the inlet of the hot water so that the hot water can be mixed with water while the hot water flows in, instead of providing a hot water flow path in the cylinder. In order to meet such requirements, in Patent Document 1, the cylinder as the outer shell is made of resin.

[0009] Prior art literature

[0010] Patent Literature

[0011] Patent Document 1: (Japanese) Patent Publication No. 6-294475 Summary of the invention

[0012] Technical problem to be solved by the invention

[0013] In a bathroom using a hot and cold water mixing faucet with a barrel as a shell formed by a casting, a hot water supply port, two discharge ports to a faucet, a shower, etc., and a cold water supply port are arranged in sequence. Therefore, even if the barrel as the shell is made of resin, in order to facilitate the replacement operation with the existing casting molded product, it is necessary to arrange the hot water supply port, the discharge port, and the cold water supply port in the order. In this case, it is necessary to provide a guide passage for guiding water to the hot water supply port side where the mixing portion is arranged. At this time, it is necessary to surround the discharge port and seal the outer peripheral surface of the barrel and the switching valve to prevent cold water from mixing with the discharge port to the faucet and the shower in the guide passage.

[0014] However, in order to seal the two outlets of the faucet and the shower outlet arranged at a distance in the circumferential direction of the cylinder, two annular seals need to be arranged at a distance in the circumferential direction on the circumferential surface of the cylinder to surround the outlets respectively.

[0015] Here, in a sealing structure using a general O-ring, since it is arranged circumferentially on the outer periphery of the switching valve, a step portion is formed axially between the two sealing components, shortening the insertion distance at which the sealing ring begins to be compressed between the cylinder and the switching valve, thereby preventing the sealing component from rolling up during insertion.

[0016] However, when the sealing component is arranged on the circumferential surface of the cylinder in a manner to surround the discharge port so as to avoid blocking the flow of water through the guide passage, when the switching valve with the sealing component is to be inserted into the cylinder, the insertion distance becomes longer, and there is a concern that the sealing component may be twisted or rolled up, or the sealing component may be damaged, resulting in a reduction in the sealing performance of the sealing component. Therefore, there is a problem of deterioration in the assemblability of the switching valve installed with the sealing component.

[0017] The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a hot and cold water mixing faucet capable of improving the assemblability of a switching valve to which a sealing member is attached.

[0018] Means for solving problems

[0019] [1] In order to achieve the above-mentioned object, the present invention is a hot and cold water mixing faucet (for example, the hot and cold water mixing faucet 1 of the embodiment. The same shall apply hereinafter). It is characterized by comprising: a cylinder (for example, the cylinder 2 of the embodiment. The same shall apply hereinafter). A hot water supply port, which passes through the outer circumference and inner circumference of the cylinder and guides hot water into the cylinder (for example, the hot water supply port 21 of the embodiment. The same shall apply hereinafter). A cold water supply port, which passes through the outer circumference and inner circumference of the cylinder and guides cold water into the cylinder (for example, the cold water supply port 22 of the embodiment. The same shall apply hereinafter). A mixing portion, which is arranged on the cylinder. In the embodiment, the cold and hot water are mixed in a temperature-adjustable manner (for example, the mixing portion 3 of the embodiment. The same below); a first discharge port, which passes through from the inner circumference to the outer circumference of the cylinder and can discharge the cold and hot water discharged from the mixing portion (for example, the first discharge port 23 of the embodiment. The same below); a second discharge port, which passes through from the inner circumference to the outer circumference of the cylinder and can discharge the cold and hot water discharged from the mixing portion (for example, the second discharge port 24 of the embodiment. The same below); and a switching valve, which is inserted into the cylinder and freely selects the first discharge port and the second discharge port (for example, the switching valve 4 of the embodiment. The switching valve comprises a switching outer cylinder (for example, the switching outer cylinder 41 of the embodiment. The same below.) and a switching inner cylinder rotatably arranged in the switching outer cylinder (for example, the switching inner cylinder 42 of the embodiment. The same below.), a guide passage is provided between the cylinder body and the switching outer cylinder, and the guide passage guides the water introduced from the cold water supply port to the mixing part (for example, the guide passage 41c of the embodiment. The same below.), the switching outer cylinder comprises a first connecting hole connected to the first discharge port (for example, the first connecting hole 41a of the embodiment. The same below.) and a connecting hole connected to the second discharge port The switching inner cylinder is rotatably arranged relative to the switching outer cylinder, and has a selection hole (for example, the first selection hole 42a and the second selection hole 42b of the embodiment. The same below.) for freely selecting one of the first connecting hole and the second connecting hole by rotating the switching inner cylinder, and a first annular seal (for example, the first annular seal 51 of the embodiment. The same below.) and a second annular seal (for example, the second annular seal 52 of the embodiment. The same below.) are provided between the cylinder body and the switching outer cylinder.), the first annular seal is sealed liquid-tightly to prevent the cold and hot water flowing between the first connecting hole and the first discharge port from leaking into the guide passage, the second annular seal is sealed liquid-tightly to prevent the cold and hot water flowing between the second connecting hole and the second discharge port from leaking into the guide passage, the inner circumferential surface of the cylinder and the outer circumferential surface of the switching outer cylinder are inclined so that the first annular seal and the second annular seal are inclined in a manner that gradually approaches the central axis of the cylinder (for example, the central axis L0 of the embodiment. The same applies hereinafter) relative to the insertion direction of the switching valve into the cylinder.

[0020] According to the present invention, since the inner circumferential surface of the cylinder and the outer circumferential surface of the switching outer cylinder are inclined so that the first annular seal and the second annular seal gradually approach the central axis of the cylinder as they approach the front of the insertion direction of the switching valve into the cylinder, when the switching valve is inserted into the cylinder, the friction between the cylinder and the switching outer cylinder via the first annular seal and the second annular seal can be suppressed at the beginning of insertion.

[0021] Moreover, when the switching valve is inserted into the cylinder, the first annular seal and the second annular seal can be firmly compressed by the cylinder and the switching valve. Therefore, according to the present invention, when the switching valve is inserted into the cylinder, the first annular seal and the second annular seal are difficult to roll up, and a suitable sealing structure can be easily formed, thereby improving the assembly performance of the switching valve equipped with the sealing component.

[0022] [2] In addition, in the present invention, it is preferred that a protrusion (for example, the first protrusion 61, the second protrusion 62, and the third protrusion 63 of the embodiment, and the same applies hereinafter) is provided in the guide passage so that the inner peripheral surface of the cylinder body contacts the outer peripheral surface of the switching outer cylinder.

[0023] Here, when the guide passage is formed wide to ensure the amount of water, there is a concern that the contact portion between the cylinder and the switching outer cylinder is small, and the switching outer cylinder is eccentric relative to the cylinder under the elastic force of the first annular seal and the second annular seal, and the first annular seal and the second annular seal are not properly compressed between the cylinder and the switching outer cylinder. If the first annular seal and the second annular seal are not properly compressed, the water in the guide passage is accidentally mixed with the cold and hot water discharged from the first discharge port and the second discharge port, and the temperature of the mixed water adjusted to an appropriate temperature in the mixing part is lowered.

[0024] According to the present invention, even if the guide passage is formed wider to ensure the amount of water, the cylinder and the switching outer cylinder can be firmly in contact via the protrusion, so the first annular seal and the second annular seal can be appropriately compressed, and the water in the guide passage can be prevented from accidentally mixing with the cold and hot water discharged from the first discharge port and the second discharge port.

[0025] [3] In addition, in the present invention, it is preferred that the inclination angles of the first annular seal and the second annular seal be set larger than the draft angle of the inner circumferential surface of the cylinder required when the cylinder is formed. According to the present invention, the assembly performance of the switching valve equipped with the sealing component can be further improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 It is an explanatory diagram schematically showing a hot and cold water mixing faucet according to an embodiment of the invention.

[0027] Figure 2 It is a cross-sectional view schematically showing the switching valve according to the present embodiment.

[0028] Figure 3 It is an explanatory diagram showing a first communication hole and a second communication hole of a hot and cold water mixing faucet according to a first example of the present embodiment.

[0029] Figure 4 This is an explanatory diagram showing a side surface of the switch outer cylinder of the first embodiment.

[0030] Figure 5 This is an explanatory diagram showing a side surface of the switch outer cylinder of the first embodiment.

[0031] Figure 6 This is an explanatory diagram showing the switching outer cylinder of the first embodiment from the center axis direction.

[0032] Figure 7 It means Figure 6 An explanatory diagram of a cross section of the switching outer cylinder of the first embodiment taken along line VII-VII. DETAILED DESCRIPTION

[0033] A hot and cold water mixing faucet according to an embodiment of the present invention will be described with reference to the drawings. Figure 1: is a drawing schematically showing a hot and cold water mixing faucet 1 of the present embodiment. The hot and cold water mixing faucet 1 of the present embodiment comprises: a cylindrical body 2 made of resin; a mixing section 3, which is arranged in the body 2, and the compression amount (initial load, initial deflection) of a temperature-sensitive spring (not shown) whose spring constant changes depending on temperature is adjusted by a pinching section 3a, so that the mixing ratio of hot and cold water can be changed to adjust the temperature; and a switching valve 4 inserted in the body 2. Hot water and cold water are respectively put into the mixing section 3 from the outer circumference to the inner side, and the hot and cold water are mixed inside the mixing section 3. The mixed water mixed in the mixing section 3 is supplied to the inner side of the switching valve 4 (the switching inner cylinder described later). It should be noted that in the mixing section 3, a temperature-sensitive component can be used to replace the temperature-sensitive spring in the temperature sensing, and the temperature-sensitive component uses wax. The configuration of the mixing section 3 only needs to be able to mix hot and cold water and adjust to an appropriate temperature.

[0034] The cylinder 2 includes: a hot water supply port 21 that passes through from the outer circumference to the inner circumference of the cylinder 2; a cold water supply port 22 that passes through from the outer circumference to the inner circumference of the cylinder 2 at a distance from the hot water supply port 21 in the extension direction of the central axis L0 of the cylinder 2; a first discharge port 23 that is arranged between the hot water supply port 21 and the cold water supply port 22 and passes through from the inner circumference to the outer circumference of the cylinder 2 toward the downward direction; and a second discharge port 24 that passes through from the inner circumference to the outer circumference of the cylinder 2 toward the rear side at a circumferentially staggered position relative to the first discharge port 23.

[0035] The hot water supply port 21 is supplied with hot water from a hot water supply device (not shown). The cold water supply port 22 is supplied with cold water from a water pipe (not shown). The hot and cold water discharged from the mixing unit 3 are discharged from the first discharge port 23 and the second discharge port 24. The first discharge port 23 is connected to a faucet (not shown), and the second discharge port 24 is connected to a shower (not shown).

[0036] Reference Figure 2 , the switching valve 4 includes a switching outer cylinder 41 made of resin and arranged in the cylinder body 2 to prevent rotation, and a switching inner cylinder 42 made of metal or resin and arranged rotatably in the switching outer cylinder 41. The switching outer cylinder 41 is provided with a first communication hole 41a ( Figure 3 ), and a second communication hole 41 b that penetrates from the inner circumferential surface to the outer circumferential surface in a manner that is spaced apart from the first communication hole 41 a in the direction of the central axis L0 of the cylinder 2 and also spaced apart in the circumferential direction of the cylinder 2.

[0037] Here, the resin used as the material of the cylinder 2 and the switching outer cylinder 41 can be a plastic having excellent heat resistance, dust resistance, chemical resistance, and flame resistance. If expressed in numerical values, a plastic having a tensile strength of about 50 MPa or more, an impact strength of about 50 J / m or more, and a heat deformation temperature of about 100° C. or more can be used. For example, polyamide (PA), polycarbonate (PC), polyoxymethylene (POM), modified polyphenylene ether (PPE), polyester, polyphenylene sulfide (PPS), polyarylate (PAR), polyetherimide (PES), and the like can be used.

[0038] (PEI), polysulfone (PSF), polyethersulfone (PES), polyetherketone (PEK), polyetheretherketone (PEEK), polyimide (PI), polyamideimide (PAI), fluororesins, liquid crystal plastics, thermosetting resins with excellent impact resistance and chemical resistance, glass fiber resins, etc.

[0039] The switching inner cylinder 42 is provided with a first selection hole 42a penetrating from the inner circumference to the outer circumference, and a second selection hole 42b penetrating from the inner circumference to the outer circumference with a gap between the first selection hole 42a in the direction of the central axis L0 and in the circumferential direction of the switching inner cylinder 42. A gripping portion 42c is provided at the end of the switching inner cylinder 42 on the opposite side to the mixing portion 3, and the switching inner cylinder 42 can be rotated relative to the switching outer cylinder 41 by rotating the gripping portion 42c.

[0040] The switching inner cylinder 42 is switchable among three positions: a first communication position in which the first selection hole 42a is connected to the first communicating hole 41a and the communication between the second selection hole 42b and the second communicating hole 41b is blocked; a water stop position in which the communication between the first selection hole 42a and the first communicating hole 41a is blocked and the communication between the second selection hole 42b and the second communicating hole 41b is also blocked; and a second communication position in which the communication between the first selection hole 42a and the first communicating hole 41a is blocked and the second selection hole 42b and the second communicating hole 41b are connected.

[0041] As described later, since the first communication hole 41 a communicates with the first discharge port 23 and the second communication hole 41 b communicates with the second discharge port 24 , the switching valve 4 freely selects the first discharge port 23 and the second discharge port 24 by rotating the switching inner tube 42 relative to the switching outer tube 41 .

[0042] A plurality of O-rings 43 are provided between the switching outer cylinder 41 and the switching inner cylinder 42 to prevent the water entering from the guide passage 41c from mixing with the mixed water discharged from the first selection hole 42a or the second selection hole 42b. Figure 2 , but can be changed appropriately.

[0043] Figure 3 to Figure 7A first example of the switching outer cylinder 41 of this embodiment is shown. Figures 3 to 7 A guide passage 41 c is provided on the outer peripheral surface of the switching outer cylinder 41 . The guide passage 41 c is recessed so as to guide the water flowing into the cylinder body 2 from the cold water supply port 22 to the mixing portion 3 and is extended toward the mixing portion 3 .

[0044] In addition, a first annular seal 51 ( Figure 7 ), the first annular seal 51 annularly blocks the switching outer cylinder 41 and the cylinder body 2 so as to guide the cold and hot water discharged from the first communication hole 41a to the first discharge port 23 without leaking to the guide passage 41c. The first annular seal 51 is configured to surround the first communication hole 41a. Here, "annular" refers to the shape of a closed circle, and does not include a shape such as a C-shaped shape.

[0045] In addition, a second annular seal 52 made of an elastic member such as rubber is provided on the outer peripheral surface of the switching outer cylinder 41, and the second annular seal 52 annularly blocks the switching outer cylinder 41 and the cylinder body 2 so as to guide the cold and hot water discharged from the second communication hole 41b to the second discharge port 24 without leaking to the guide passage 41c. The second annular seal 52 is configured to surround the second communication hole 41b. Here, "annular" refers to the shape of a closed circle, and does not include a shape such as a C-shaped shape.

[0046] In addition, the annular seal of the present embodiment is a special-shaped seal other than a circular shape, but it may also be a circular shape, and the shape may be appropriately changed. In addition, since the first annular seal 51 and the second annular seal 52 may form two circles in a manner of separating the first communicating hole 41a and the second communicating hole 41b, for example, the first annular seal 51 and the second annular seal 52 may also be connected at the outer circumference.

[0047] The first annular seal 51 and the second annular seal 52 are respectively fitted into the first seal groove 41d and the second seal groove 41e formed on the outer peripheral surface of the switching outer cylinder 41. The bottom surfaces of the first seal groove 41d and the second seal groove 41e are formed in a tapered shape that is inclined so as to gradually approach the central axis L0 of the cylinder 2 as it moves toward the front side of the insertion direction of the switching valve 4 into the cylinder 2. In addition, in the following description, the front side of the switching valve 4 insertion direction on the central axis L0 is sometimes referred to as the front end side, and the side opposite to the front end side is referred to as the base end side, and the description is appropriately made.

[0048] The first seal groove 41d and the second seal groove 41e are formed at a certain depth in the outer tapered base portion of the switching outer cylinder 41 where the first seal groove 41d and the second seal groove 41e are formed. As a result, the bottom surfaces of the first seal groove 41d and the second seal groove 41e are inclined as a whole so as to approach the central axis L0 as they go toward the front side in the insertion direction.

[0049] The inner peripheral surface of the cylinder 2 is also formed in a tapered shape in parallel with the tapered shape of the bottom surfaces of the first seal groove 41d and the second seal groove 41e (or the base portion of the switching outer cylinder 41 formed with the first seal groove 41d and the second seal groove 41e).

[0050] Thus, when the switching valve 4 is inserted into the cylinder 2 , at the start of insertion, the frictional force between the cylinder 2 and the switching outer cylinder 41 via the first annular seal 51 and the second annular seal 52 can be suppressed.

[0051] Generally speaking, when a cylindrical part is formed by injection molding, in order to easily extract the mold that determines the inner peripheral shape of the cylindrical part, a very small slope (draft angle) is sometimes formed on the inner periphery. In this embodiment, the slope of the base portion of the outer peripheral tapered shape is preferably steeper than the draft angle (larger inclination angle).

[0052] Specifically, in the cylinder 2 of the present embodiment, a draft angle may also be provided on the inner periphery of the portion where the mixing portion 3 is arranged inside. Moreover, in this case, the inclination angle of the outer periphery of the tapered base portion and the inclination angle of the inner periphery of the portion where the switching valve 4 is arranged inside the cylinder 2 are preferably set to be larger than the inclination angle of the inner periphery of the portion where the mixing portion 3 is arranged inside the cylinder 2, for example, preferably set to be greater than 2 degrees. Thus, when the switching valve 4 is inserted into the cylinder 2, the first annular seal 51 and the second annular seal 52 can be reliably prevented from biting into the opening edge of the second discharge port 24 on the inner peripheral surface of the cylinder 2, and the assemblability of the switching valve 4 installed with the first annular seal 51 and the second annular seal 52 can be further improved. In addition, in Figure 2 In the figure, the inclination angle of the cone shape is exaggerated for convenience of explanation.

[0053] In addition, when the switching valve 4 is inserted into the cylinder 2, the first annular seal 51 and the second annular seal 52 can be firmly compressed by the cylinder 2 and the switching valve 4. Therefore, according to the hot and cold water mixing faucet 1 of this embodiment, when the switching valve 4 is inserted into the cylinder 2, the first annular seal 51 and the second annular seal 52 are difficult to roll up, and a suitable sealing structure can be easily formed, and the assembly property of the switching valve 4 installed with the first annular seal 51 and the second annular seal 52 into the inner cylinder 2 can be improved. In addition, in the switching valve 4, as long as the outer periphery of the base portion of the switching outer cylinder 41 forming the first sealing groove 41d and the second sealing groove 41e is tapered so that the first annular seal 51 and the second annular seal 52 are inclined, the outer periphery of the other parts can be tapered or straight (with a constant outer diameter).

[0054] In the hot and cold water mixing faucet 1 of the present embodiment, the outer peripheral surface of the switching outer cylinder 41 is provided with a first protrusion 61 , a second protrusion 62 , and a third protrusion 63 located in the guide passage 41 c so that the inner peripheral surface of the cylinder body 2 contacts the outer peripheral surface of the switching outer cylinder 41 .

[0055] The first protrusion 61 is formed relatively long in the direction of the central axis L0 of the cylinder 2, and is arranged at the approximate center of the circumferential direction of the guide passage 41c formed between the front end side of the central axis L0 of the first annular seal 51 and the second annular seal 52 in the insertion direction. The second protrusion 62 is located at the same phase as the first protrusion 61 in the circumferential direction of the switching outer cylinder 41, and is located closer to the base end side in the insertion direction than the first protrusion 61. The third protrusion 63 is located at the same phase as the first annular seal 51 in the circumferential direction of the switching outer cylinder 41, and is arranged at a distance from the second protrusion 62 in the circumferential direction of the switching outer cylinder 41. On the outer peripheral surface of the switching outer cylinder 41, the second protrusion 62 and the third protrusion 63 are arranged at a distance in the circumferential direction in a manner that divides the guide passage 41c at equal intervals in the circumferential direction.

[0056] Here, in the case where the guide passage 41c is formed widely on the circumference of the switching outer cylinder 41 in order to ensure the amount of water, there is a concern that the contact portion between the cylinder 2 and the switching outer cylinder 41 is small, and under the action of the elastic force of the first annular seal 51 and the second annular seal 52, the switching outer cylinder 41 is eccentric relative to the cylinder 2 to the side where the first annular seal 51 and the second annular seal 52 do not exist, and the first annular seal 51 and the second annular seal 52 are not properly compressed between the cylinder 2 and the switching outer cylinder 41. In the case where the first annular seal 51 and the second annular seal 52 are not properly compressed, the water in the guide passage 41c is accidentally mixed with the cold and hot water discharged from the first discharge port 23 and the second discharge port 24, and the temperature cannot be properly adjusted.

[0057] According to the hot and cold water mixing faucet 1 of the present embodiment, even if the guide passage 41c is formed wider to ensure the water volume, the cylinder 2 and the switching outer cylinder 41 can be firmly in contact via the first protrusion 61, the second protrusion 62, and the third protrusion 63, so that the eccentricity of the switching outer cylinder 41 relative to the cylinder 2 can be suppressed and the first annular seal 51 and the second annular seal 52 can be appropriately compressed, so that the water in the guide passage 41c can be prevented from accidentally mixing with the hot and cold water discharged from the first discharge port 23 and the second discharge port 24.

[0058] In addition, in the present embodiment, although it is described that the guide passage 41c and the first protrusion 61, the second protrusion 62, and the third protrusion 63 are provided on the outer peripheral surface of the switching outer cylinder 41, in the present invention, the guide passage and the protrusion may also be formed on the inner peripheral surface of the cylinder 2. However, providing the guide passage and the protrusion on the outer peripheral surface of the switching outer cylinder will make the manufacture of the hot and cold water mixing faucet easier. In addition, the position, number, size, and shape of the protrusion can be appropriately changed, and the protrusion may be omitted as long as the annular seal can be appropriately compressed.

[0059] In addition, in the present embodiment, although the outer circumferential surface of the switching outer cylinder 41 and the inner circumferential surface of the cylinder 2, i.e., the portion facing the outer circumferential surface of the switching outer cylinder 41, are described as being conical, this is not limited thereto. In the cold and hot water mixing faucet of the present invention, in a structure in which the first discharge port and the second discharge port are arranged in the circumferential direction and the first discharge port and the second discharge port are arranged at the same position in the direction of the central axis of the cylinder 2, or in a structure in which the discharge port is located between the hot water supply port and the cold water supply port and a guide passage is provided to guide water from the cold water supply port to the mixing portion arranged on the hot water supply port side, it is sufficient to provide an inclined surface in such a manner that the first annular seal and the second annular seal are arranged in an inclined manner. Therefore, for example, the inner circumferential surface of the cylinder 2 and the outer circumferential surface of the switching outer cylinder 41 may also be a pyramid shape or a wedge shape.

[0060] Description of Reference Numerals

[0061] 1 hot and cold water mixing faucet, 2 cylinder, 21 hot water supply port, 22 cold water supply port, 23 first discharge port, 24 second discharge port, 3 mixing part, 3a pinching part, 4 switching valve, 41 switching outer cylinder, 41a first communicating hole, 41b second communicating hole, 41c guide passage, 41d first sealing groove, 41e second sealing groove, 42 switching inner cylinder, 42a first selection hole, 42b second selection hole, 42c pinching part, 43 O-ring, 51 first annular seal, 52 second annular seal, 61 first protrusion, 62 second protrusion, 63 third protrusion, L0 center axis.

Claims

1. A hot and cold water mixing faucet, characterized in that: have: Cylinder; A hot water supply port, which penetrates from the outer circumference of the cylinder to the inner circumference and guides hot water into the cylinder; A cold water supply port, which penetrates from the outer peripheral surface of the cylinder to the inner peripheral surface and guides cold water into the cylinder; A mixing unit is disposed in the cylinder and mixes cold and hot water in a temperature-adjustable manner; a first discharge port, which penetrates from the inner circumference of the cylinder to the outer circumference, and can discharge the cold and hot water discharged from the mixing part; a second discharge port, which penetrates from the inner circumference of the cylinder to the outer circumference, and can discharge the cold and hot water discharged from the mixing part; as well as a switching valve inserted into the cylinder to freely select the first discharge port and the second discharge port, The switching valve includes a switching outer cylinder and a switching inner cylinder rotatably arranged in the switching outer cylinder. A guide passage is provided between the cylinder body and the switching outer cylinder, and the guide passage guides the water introduced from the cold water supply port to the mixing part. The switching outer cylinder includes a first communication hole communicating with the first discharge port and a second communication hole communicating with the second discharge port. The switching inner cylinder is rotatably arranged relative to the switching outer cylinder, and includes a selection hole for freely selecting one of the first communicating hole and the second communicating hole by rotating the switching inner cylinder. A first annular seal and a second annular seal are provided between the cylinder body and the switching outer cylinder. The first annular seal is sealed liquid-tightly to prevent the cold and hot water flowing between the first connecting hole and the first discharge port from leaking into the guide passage. The second annular seal is sealed liquid-tightly to prevent the cold and hot water flowing between the second connecting hole and the second discharge port from leaking into the guide passage. The inner circumferential surface of the cylinder and the outer circumferential surface of the switching outer cylinder are inclined so that the first annular seal and the second annular seal gradually approach the central axis of the cylinder as they approach the front in the insertion direction of the switching valve into the cylinder.

2. The hot and cold water mixing faucet according to claim 1, characterized in that: The guide passage is provided with a protrusion that allows the inner peripheral surface of the cylinder to contact the outer peripheral surface of the switching outer cylinder.

3. The hot and cold water mixing faucet according to claim 1 or 2, characterized in that: The inclination angles of the first annular seal and the second annular seal are set to be larger than a draft angle of the inner peripheral surface of the cylindrical body required when molding the cylindrical body.

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