JP4805088B2 - Hot water tap - Google Patents

Description

  The present invention is configured to urge a movable valve body provided in the faucet body so as to be movable in the axial direction from both sides in the axial direction by a temperature-sensitive spring and a bias spring made of a shape memory material. It relates to hot and cold water mixing taps.

  This type of hot and cold water mixing valve is composed of a water side valve seat and a hot water side valve seat provided in the faucet body, and an axial line coaxially in the faucet body so as to selectively contact and separate these valve seats. A movable valve body movably provided in the direction, a hot water inflow chamber and a hot water mixing chamber formed in the water faucet body upstream and downstream of the movable valve body, and the movable valve body as a hot water side valve. A temperature-sensitive spring made of a shape memory material provided on the hot water / water mixing chamber side so as to be biased in a direction approaching the seat; and the movable valve body is made to oppose the biasing force of the temperature-sensitive spring to the water-side valve seat A bias spring provided on the hot water inflow chamber side so as to be biased in a direction approaching, and a cylindrical housing provided at one end of the faucet body and movably accommodating the movable valve body in an axial direction; A temperature adjustment handle (hereinafter referred to as a temperature adjustment handle) housed in the cylindrical housing. A temperature adjusting plug rod (hereinafter referred to as a temperature adjustment plug rod) that rotates in conjunction with the rotation operation, and a female screw member that is threadedly engaged with a male screw portion formed on the temperature adjustment plug rod. And a cylindrical moving member that moves in the axial direction in the cylindrical housing, and the bias spring is expanded and contracted by moving the moving member in the axial direction to move the movable valve body in the axial direction. The water discharge temperature is adjustable.

  In the conventional hot and cold water mixing tap having the above-described configuration, the mutual contact surface for preventing the temperature adjusting plug rod and the cylindrical housing is perpendicular to the axial direction in which the movable valve body moves. Was composed.

  By the way, in this kind of hot and cold water mixing tap, in the state where the movable valve body is located in a high temperature water discharge region, the temperature sensitive spring is greatly compressed, and the urging force of the temperature sensitive spring is significantly increased. The urging force of the temperature-sensitive spring and the accumulated force of the bias spring are summed up to exert a strong axial force on the moving member in the cylindrical housing, and this strong axial force causes the moving member to pass through the female screw member and the male screw portion. A rotational force acts on the temperature adjustment plug rod that is screwed together, and the temperature adjustment plug rod rotates unexpectedly, and the movable valve element is separated from the water side valve seat at the time of this temperature adjustment plug rod. As a result, cold water flows into the hot / cold water mixing chamber, and the water discharge temperature adjusted (set) in the high temperature water discharge area cannot be maintained easily. In particular, the male thread portion formed on the temperature adjusting plug rod is often composed of, for example, a double thread having a large lead so as to reduce the operation load for temperature adjustment as much as possible. For this reason, in order to bring out the function of preventing the temperature control plug bar from being removed, the conventional hot and cold water mixing plug has a limited inner diameter so that the temperature control plug bar and the cylindrical housing are brought into contact with each other at surfaces perpendicular to the axial direction. Because the contact area of both contact surfaces is small and the rotational friction resistance between both contact surfaces cannot be sufficiently large, the temperature adjusting plug rod is more likely to rotate along with the action of the axial force, and this is caused by this rotation. There is a problem that the occurrence of such a bad situation is unavoidable.

  As a means for preventing the rotation of the temperature control plug bar, such a problem that the conventional general hot and cold water mixing plug has, between the surfaces perpendicular to the axial direction of the temperature control plug bar and the cylindrical housing, A compression coil spring is interposed so as to oppose the biasing force of the temperature-sensitive spring, so that the biasing force of the temperature-sensitive spring and the accumulated force of the bias spring can be obtained while the movable valve body is positioned in a high temperature water discharge area. There has been proposed a technique in which the axial force acting on the moving member is weakened by phase reduction to prevent rotation of the temperature adjusting plug rod (see, for example, Patent Document 1).

  In addition, a rotation resistance mechanism such as a ratchet is interposed between surfaces perpendicular to the axial direction of the temperature adjusting plug rod and the cylindrical housing, or the urging force of the rotation resistance mechanism and the temperature sensitive spring is used. A coexisting compression coil spring is also proposed (for example, see Patent Document 2).

  JP 2005-133848 A   JP 2003-28337 A

  However, in the case of the conventionally proposed hot and cold water mixing plugs shown in Patent Document 1 and Patent Document 2, a compression coil spring, a ratchet, or the like is provided between surfaces perpendicular to the axial direction of the temperature control plug bar and the cylindrical housing. In order to incorporate the rotation resistance mechanism or both of them, it is necessary to provide an axial space for the assembly on the cylindrical housing side, and this cylindrical housing has a large axial length. However, there is a problem that the shaft length increases in size. In addition, since the number of built-in parts for preventing rotation of the temperature adjusting plug rod increases, there is a problem that the cost is easily increased from the viewpoint of production and assembly.

  The present invention has been made in view of the above circumstances, and its purpose is to reduce costs and reduce the overall size without using any special parts for preventing rotation of the temperature control plug rod. An object of the present invention is to provide a hot and cold water mixing tap capable of reliably and stably maintaining the water discharge temperature adjusted (set) in the high temperature water discharge area.

  In order to achieve the above-mentioned object, a hot and cold water mixing valve according to the present invention includes a water side valve seat and a hot water side valve seat provided in a faucet body, and the above-mentioned valve seats so as to be selectively contacted and separated. A movable valve body provided coaxially in the faucet body so as to be movable in the axial direction, and a hot water inflow chamber and a hot water mixing chamber formed in the water faucet body on the upstream side and downstream side of the movable valve body, respectively A temperature sensitive spring made of a shape memory material provided on the hot water / water mixing chamber side so as to bias the movable valve body in a direction approaching the hot water valve seat, and a biasing force of the temperature sensitive spring A bias spring provided on the hot water inflow chamber side to urge the movable valve body in a direction approaching the water side valve seat, and the movable valve body provided at one end of the faucet body are moved in the axial direction. A cylindrical housing that can be accommodated and rotation of a temperature control handle that is accommodated in the cylindrical housing A temperature adjusting plug rod that rotates in conjunction with the operation, and a female screw member that engages with a male screw portion formed on the temperature adjusting plug rod, and moves axially in the cylindrical housing as the plug rod rotates. A cylindrical moving member, and the bias spring is expanded and contracted by moving the moving member in the axial direction to move the movable valve body in the axial direction so that the discharge temperature of the hot / cold water can be adjusted. In the hot and cold water mixing plug, the mutual contact surface for preventing the temperature adjusting plug rod and the cylindrical housing is formed as a tapered surface inclined in the axial direction so that the diameter gradually increases toward the movable valve body. It is a feature.

  In the present invention, the mutual contact surface for preventing the temperature control plug rod and the cylindrical housing is formed on the tapered surface inclined in the axial direction so as to gradually increase in diameter toward the movable valve body as described above. Even without increasing the diameter and axial length, the contact area of both the contact surfaces is increased, and the wedge effect is also expressed by utilizing the biasing force of the temperature-sensitive spring to sufficiently secure the rotational friction resistance between both surfaces. be able to. Therefore, the combination of parts such as a coil spring and a ratchet, such as a coil spring and a ratchet, and the installation space are not required between both sides, and the diameter of the cylindrical housing and the shortened shaft length are combined. The urging force of the temperature-sensitive spring and the accumulating force of the bias spring are greatly increased while the movable valve element is located in the hot water discharge area, while reducing the cost and miniaturization of the manufacturing and assembly surfaces Even if a strong rotational force acts on the temperature adjustment plug rod due to the sum of the above, the rotational friction resistance developed between the two surfaces sufficiently overcomes the rotational force, and the temperature adjustment plug rod rotates unexpectedly. This can be surely prevented, and thereby, it is possible to reliably and stably maintain the water discharge temperature adjusted (set) in the warm water discharge area.

  In particular, in the present invention, even when the male screw portion formed on the temperature adjusting plug rod is composed of a double thread having a large lead so that the operation load for temperature adjustment can be reduced as much as possible (Claim 4), both sides as described above. It is possible to prevent the rotation of the temperature adjusting plug rod with the rotational friction resistance that is expressed in the middle, and thereby it is possible to achieve both the ease of the temperature adjustment operation and the stable maintenance of the adjusted water discharge temperature.

In the present invention, the mutual contact taper surface for preventing the temperature control plug rod and the cylindrical housing is preferably set to an inclination angle in the range of 20 to 60 degrees with respect to the axis of the movable valve body. Item 2).
By the way, if the inclination angle of the tapered surface is set to a value exceeding 60 degrees, the wall thickness of the annular wall portion on the cylindrical housing side that prevents and supports the temperature adjusting plug rod is reduced, and a strong axial force (axial load) is obtained. ), There is a problem in strength that the annular wall portion is easily deformed, and in order to eliminate such a problem in strength, if the wall thickness of the annular wall portion is increased, a corresponding amount of cylinder The shaft length of the housing is increased, which is an obstacle to downsizing the entire hot and cold water mixing tap.
Further, when the inclination angle of the tapered surface is set to be less than 20 degrees, the load applied perpendicularly to the annular wall portion of the cylindrical housing with respect to the axial load increases, and the tapered surface on the cylindrical housing side is easily bent. As a result, it becomes easier to rotate on the contrary than the case where the temperature control plug bar is a vertical surface.

  As described above, in consideration of all of the strength, axial length (space), and predetermined rotation prevention function of the cylindrical housing, it is most preferable to set the inclination angle of the tapered surface to 45 degrees. Item 3).

  Further, as the bias spring used in the present invention, the movable valve body is brought into contact with the hot water side valve seat more than the spring constant when the movable valve body is moved to an intermediate position between the hot water side valve seat and the water side valve seat. It is desirable that the spring constant is composed of a single spring having at least two stages of large and small spring constants so that the spring constant when moved to the vicinity is increased. By using a single bias spring with a large and small two-stage spring constant that operates irregularly according to the water discharge temperature adjustment by rotating the temperature adjustment handle in this way, the water discharge temperature is adjusted near the middle temperature water discharge area. In addition to being able to maintain the temperature stably, in the high-temperature water discharge area, it is possible to sufficiently counteract the urging force of the temperature-sensitive spring whose urging force is increased by compression with the urging force of the bias spring. It is possible to enhance the anti-rotation function of the adjusting plug rod and to maintain the intended high temperature water discharge temperature. Moreover, the change in the spring constant of the bias spring can suppress the occurrence of vibration due to the resonance of the bias spring with the temperature-sensitive spring.

  As the single bias spring having the above-mentioned two large and small spring constants, a coil spring spirally wound at an unequal pitch in the moving direction of the movable valve element (Claim 5), or the moving direction of the movable valve element Any of the conical springs (Claim 6) wound at an equal pitch or substantially the same pitch and with the diameter gradually changed in the moving direction may be used. From the viewpoint of maintaining the same axis and manufacturing and processing, it is more preferable to use a coil spring wound spirally at an unequal pitch.

Embodiments of the present invention will be described below.
FIG. 1 shows an overall cross-sectional view of a hot and cold water mixing tap A that is installed on a wall surface of a bathroom, for example, and supplies and discharges water, hot water, or hot water mixed water to a water discharge pipe such as a shower head or a faucet.

  In FIG. 1, reference numeral 1 denotes a tubular faucet body, which is provided with a switching handle 2 that supplies water, hot water or mixed water to one end thereof and has a discharge / water stop function and a flow rate adjusting function. Further, a temperature control handle 3 having a function of adjusting the temperature of the hot / cold water is provided. The temperature control handle 3 and the switching handle 2 are configured to be rotatable around the axis X of the faucet body 1 during operation. The faucet body 1 has an insertion opening 1a for a switching unit 4 (described later) at one end, and an insertion opening 1b for a temperature control unit 6 (described later) at the other end.

  The switching unit 4 that can be connected to the switching handle 2 is inserted and arranged in the faucet body 1 through the opening 1 a so as to be coaxial with the axial core X of the faucet body 1. Reference numeral 5 denotes a switching display ring. The temperature control unit 6 that can be connected to the temperature control handle 3 is inserted and arranged in the faucet body 1 through the opening 1b so as to be coaxial with the axis X of the faucet body 1.

  The faucet body 1 is connected to a hot water connection port 8 in which a hot water pipe joint 7 is detachably attached so as to communicate with a hot water pipe (not shown), and water so as to communicate with a water pipe (not shown). A water connection port 10 on which a piping joint 9 is detachably mounted and a shower hose connection port 12 on which an L-shaped shower hose coupling 11 is detachably mounted are formed on the upper surface side of the cylinder wall. On the lower surface side of the cylindrical wall, there is a water discharge pipe connection port to which a water discharge pipe joint (not shown) is detachably attached. In FIG. 1, a solid line arrow 111 indicates a water inflow path that flows from the water pipe into the faucet body 1, and a solid line arrow 112 indicates an annular flow path of water that flows in an annular manner in the faucet body 1. , 113 is formed from the hot water inlet chamber S to the movable valve body through the gap between the movable valve body described later and the hot water side valve seat described later. A hot water inflow path leading to the hot water mixing chamber R through the central hole is shown, and an alternate long and short dash line arrow 114 indicates a water inflow path from the water annular channel 112 to the hot water mixing chamber R.

  Reference numeral 15 denotes a cylindrical outer case of the switching unit 4, which is provided in the faucet body 1 in a horizontally placed state coaxial with the faucet body 1. The outer case 15 is made of resin, and is fixed to the inner wall of the tubular faucet body 1 in a watertight state via a seal member 16 such as an O-ring. The water is between the outer case 15 and the faucet body 1. An annular channel 112 is formed. The outer case 15 has a communication hole that communicates the hot / cold water mixing chamber R and the water discharge pipe connection port, and a communication hole that communicates the hot / water mixing chamber R and the shower hose connection port.

  Reference numeral 17 denotes a cylindrical inner case of the switching unit 4, which is provided in the outer case 15 in a horizontally placed state coaxial with the faucet body 1. The inner case 17 is formed with a water discharge pipe communicating notch and a shower hose communicating notch, and a metal switching valve 18 as a cylindrical rotating member provided in the inner case 17 is used to switch the switching handle 2. Is switched around the axis X of the faucet body 1 to the water discharge pipe side or the shower hose side via the switching plug bar 19 via the water discharge pipe communication notch or the shower hose communication notch of the inner case 17. It is configured.

  On the other hand, as shown in FIG. 2, the temperature control unit 6 mainly has an end portion that abuts on the end portion of the outer case 15 of the switching unit 4 so as to be sealable, and the water control unit 6 is interposed between the water faucet body 1. A cylindrical outer case 20 forming the annular flow path 112 and a cylindrical housing 21 provided in the outer case 20 are provided. The tubular housing 21 has a tubular valve body housing member 23 for housing the movable valve body 22 so as to be movable in the axial direction, and a horizontal axis coaxial with the faucet body 1 between the temperature control handle 3 and the movable valve body 22. A cylindrical fixed guide member 24 provided in a standing state and a cylindrical connection member 25 provided so as to connect both the members 23 and 24 so as to be sealable from the inside. The valve body housing member 23 has a part of the hot / cold water mixing chamber R formed on the switching unit 4 side via the movable valve body 22 and is formed on the temperature control unit 6 side via the movable valve body 22. And a temperature-sensitive spring 27 made of a shape memory material for biasing the movable valve body 22 in a direction approaching the ring-shaped hot water side valve seat 26, and a part of the hot water mixing chamber R. Have. The hot water side valve seat 26 is formed on one end face of the connecting member 25 on the side where the movable valve body 22 faces.

  On the other hand, the fixed guide member 24 has a temperature adjustment plug rod 28 that is rotated in conjunction with the rotation operation of the temperature adjustment handle 3, and two leads having a large lead formed on the distal end side of the temperature adjustment plug rod 28. A bottomed cylindrical moving member 29 having a female screw member 34 screwed into a male screw portion 30 made of a screw and moving in the axial direction coming into and out of contact with the movable valve body 22 as the temperature adjusting plug rod 28 rotates. Is housed. Then, in the hot water inflow chamber S on the opposite side to the temperature-sensitive spring 27 of the movable valve body 22 so as to bias the movable valve body 22 toward the water side valve seat 31, specifically, the fixed guide member 24. A bias spring 32 is provided between the connection members 25. The bias spring 32 is interposed between one end surface of the moving member 29 and a spring receiving member 33 attached to the inside of the distal end surface of the movable valve body 22. The water-side valve seat 31 is formed at the inner peripheral small diameter position which is a step portion of the valve body housing member 23. Then, each time the set temperature of the hot / cold water is adjusted, the temperature adjustment handle 3 is rotated to expand / contract the bias spring 32 in the axial direction so as to adjust and set the discharge temperature of the hot / cold water that is the set temperature. A temperature adjusting plug rod 28 and a moving member 29 are provided.

  In the hot and cold mixing tap A having the above-described basic configuration, the mutual contact surfaces 28a and 24a for preventing the temperature adjusting plug rod 28 and the annular wall portion 24A of the fixed guide member 24 in the cylindrical housing 21 are provided with the movable valve. It is formed in the taper surface which inclines in an axial direction so that it may become a large diameter gradually toward the body 22 side. These tapered surfaces 28 a and 24 a are set to an inclination angle θ in the range of 20 to 60 degrees with respect to the axis of the movable valve body 22, that is, the axis X of the faucet body 1. Here, when the strength of the fixed guide member 24 of the cylindrical housing 21, the axial length (space), and the anti-rotation function by the rotational friction resistance are comprehensively considered, the most preferable inclination angle θ is 45 degrees. A watertight seal ring 35 is interposed between the outer peripheral surface of the temperature adjusting plug rod 28 connected to both the tapered surfaces 28 a and 24 a and the inner peripheral surface of the cylindrical housing 21.

  As described above, the mutual contact surfaces 28a, 24a for preventing contact between the temperature adjusting plug rod 28 and the fixed guide member 24 of the cylindrical housing 21 are inclined 45 degrees in the axial direction so that the diameter gradually increases toward the movable valve body 22 side. In the hot and cold water mixing tap A formed on the tapered surface having the angle θ, the contact area of both the contact surfaces 28a and 24a is increased and the temperature sensitive without increasing the diameter and the axial length of the fixed guide member 24. By utilizing the biasing force of the spring 27, the wedge effect is also exhibited and the rotational frictional resistance between the both surfaces 28a, 24a can be remarkably increased. Therefore, there is no need to incorporate a part such as a coil spring or a ratchet or other rotational resistance mechanism between the both surfaces 28a and 24a, and no space for the assembly, and the fixed guide member 24 and the cylindrical housing 21 can be made smaller in diameter and shorter in length. While the manufacturing and assembling surface of the mixing plug A as a whole is reduced in cost and size, the temperature of the movable valve body 22 is remarkably increased in a state where the movable valve body 22 is positioned in a high temperature water discharge area. Even if a strong axial force acts on the moving member 29 in accordance with the sum of the force and the accumulated force of the bias spring 32 and a strong rotational force acts on the temperature adjusting plug rod 28 by the axial force, the both surfaces 28a, 24a It is possible to overcome the rotational force sufficiently with the rotational friction resistance between them and to reliably prevent the temperature control plug rod 28 from rotating, thereby ensuring that the water discharge temperature adjusted (set) in the hot water discharge region is It is possible to maintain constant good

  Further, as the bias spring 32 in the hot and cold mixing tap A having the above-described basic configuration, as shown in FIG. 3, unequal pitches in the moving direction of the movable valve body 22 (P1 ≠ P2 ≠ P3 ≠ P4 ≠ A single coil spring produced by spirally winding with P5 ≠ P6 ≠ P7) is used, so that in a water discharge region higher than 40 ° C. than the spring constant at the set temperature around 40 ° C. The spring constant at the set temperature near the maximum temperature is increased. Specifically, the bias spring (coil spring) 32 used in this embodiment is a SUS wire having a wire diameter of 1.6 mm, the effective pitch of the fine pitch portion at both ends in the length direction is 1.25 T, and the intermediate coarse pitch The coil is spirally wound so that the effective number of turns is 2.50 T, the total number of turns is 5.75 T (each seat is 1 T), the coil outer diameter D is Φ12.4 ± 0.1 mm, and the total length L is 20.67 mm. It is made by turning.

  FIG. 4 is a characteristic diagram of the spring length versus the spring load of the bias spring 32 manufactured as described above. As is clear from the figure, for example, a low temperature water discharge region where the water discharge temperature is lower than 40 ° C., for example. When the load applied to the bias spring 32 by rotation of the temperature adjustment handle 3 is 38 (N), the spring length is 17.5 mm. However, when the water discharge temperature is a middle temperature water discharge region around 40 ° C., the temperature is The load applied to the bias spring 32 by the rotation of the adjustment handle 3 is 50.0 (N), and the spring length is 16.5 mm. Thus, in the low temperature and medium temperature water discharge areas, the spring length and load measurement values are spring constants located on the straight line B having substantially the same gradient, and the water discharge temperature is higher than 40 ° C. When the temperature control handle 3 rotates, the load applied to the bias spring 32 is 115.0 (N) and the spring length is 12.7 mm. That is, in the hot water discharge region, the measured values of the spring length and the load have substantially the same gradient, and the spring constant is located on the straight line C having a larger gradient than the straight line B.

  In this way, a single bias spring 32 having a two-stage spring constant is used so that the spring constant near the maximum water temperature is larger (stronger) than the spring constant near the water discharge temperature of 40 ° C., for example. As a result, in the vicinity of the middle temperature water discharge area, the biasing force (pushing back force) of the bias spring 32 when the temperature adjustment handle 3 is fully opened is maintained as the biasing force of the temperature sensing spring 27 while maintaining the stability of the water discharge temperature near 40 ° C. It is possible to sufficiently oppose, and thereby, the function of preventing the rotation of the temperature adjusting plug rod 28 by the contact between the tapered surfaces 28a and 24a described above can be enhanced and the intended high temperature water discharge temperature can be reliably maintained. In addition, by changing the spring constant of the bias spring 32, it is possible to suppress the occurrence of vibration due to the bias spring 32 resonating with the temperature-sensitive spring 27.

  In the above-described embodiment, the coil springs 32 with unequal pitches are used as a single bias spring. Instead, as shown in FIG. 5, the pitches or substantially the same in the moving direction of the movable valve element 22 are used. You may use the conical spring 42 wound by pitch and changing the diameter gradually in the moving direction. In this case, the conical spring 42 can be obtained from a spring constant at a set temperature of around 40 ° C., similarly to the coil springs (bias springs) 32 of unequal pitch shown in the above embodiment, by devising the rate of change in diameter. However, it is configured to have a two-stage spring constant such that the spring constant at a set temperature near the maximum temperature in a water discharge region higher than 40 ° C. becomes large.

  In addition, it is desirable to use engineering plastics as materials for the temperature adjusting plug rod 28 and the fixed guide member 24 of the cylindrical housing 21 in terms of strength and heat insulation. In particular, from the viewpoint of workability and heat resistance, among engineering plastics, polyacetal (POM), modified polyphenylene oxide (modified PPO), polyphenylene sulfide (PPS), polysulfone (PSF) and the like are preferable, and particularly preferable materials are hot water and water. It is polyphenylene sulfide (PPS) excellent in dimensional stability and creep property.

  Further, the male threaded portion 30 formed on the distal end side of the temperature adjusting plug rod 28 is practically composed of a double thread having an outer diameter of 13 mm and a large lead so that the operation load for temperature adjustment can be reduced as much as possible. In this case, the inclination angle θ of the tapered surfaces 28a and 24a is set to 45 degrees, although the temperature adjusting plug rod 28 is more easily rotated by using the male screw portion 30 having such a specification. Thus, it is sufficient to overcome the rotational force acting on the temperature adjusting plug rod 28 due to the strong axial force acting on the moving member 29 in accordance with the sum of the biasing force of the temperature sensing spring 27 and the accumulated force of the bias spring 32. It was confirmed that the rotational friction resistance can be expressed between the two tapered surfaces 28a and 24a and the predetermined rotation prevention function can be surely exhibited.

  It is a whole sectional view showing an embodiment of a hot-and-water mixing tap concerning the present invention.   It is an expanded sectional view of the principal part of the hot-water and water mixing tap of embodiment same as the above.   It is an enlarged side view of the bias spring used for the hot-water and water mixing tap of embodiment same as the above.   FIG. 4 is a spring length vs. spring load characteristic diagram of the bias spring shown in FIG. 3.   It is an enlarged side view which shows the other example of the bias spring used for the hot-water and water mixing tap which concerns on this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Water faucet body 3 Temperature control handle 21 Cylindrical housing 22 Movable valve body 24 Fixed guide member 26 Hot water side valve seat 27 Temperature sensing spring 28 Temperature control plug rods 24a and 28a Mutual contact taper surface 29 Moving member 30 Male thread part 31 Valve seat 32 Bias spring 34 Female thread member S Hot water inflow chamber R Hot water mixing chamber θ Inclination angle of taper surface

Claims (7)

A water side valve seat and a hot water side valve seat provided in the faucet body, and provided so as to be movable in the axial direction on the same axis in the faucet body so as to selectively contact with and separate from both valve seats. Movable valve body, hot water inflow chamber and hot water mixing chamber formed in the faucet body on the upstream side and downstream side of the movable valve body, respectively, and biasing the movable valve body in a direction approaching the hot water side valve seat The temperature sensing spring made of a shape memory material provided on the hot water / water mixing chamber side and the movable valve body is biased in the direction approaching the water side valve seat against the biasing force of the temperature sensing spring. As described above, a bias spring provided on the hot water inflow chamber side, a cylindrical housing provided at one end of the faucet body and containing the movable valve body movably in the axial direction, and received in the cylindrical housing The temperature adjustment plug rod that rotates in conjunction with the rotation operation of the temperature adjustment handle, and this temperature A cylindrical moving member that has a female screw member that is screwed into a male screw portion formed on the adjusting plug rod, and that moves in the axial direction in the cylindrical housing as the plug rod rotates, and the axis of the moving member In the hot and cold water mixing tap configured to adjust the discharge temperature of the hot and cold mixed water by moving the movable valve body in the axial direction by expanding and contracting the bias spring by moving in a direction,
The mutual contact surface for preventing the temperature adjusting plug rod and the cylindrical housing is formed as a tapered surface inclined in the axial direction so as to gradually increase in diameter toward the movable valve body side. Mixing tap.   2. The hot and cold water according to claim 1, wherein the mutual contact taper surface for preventing the temperature adjusting plug rod and the cylindrical housing is set at an inclination angle in a range of 20 to 60 degrees with respect to the axis of the movable valve body. Mixing tap.   3. The hot and cold water mixing according to claim 1, wherein a taper surface for preventing contact between the temperature adjusting plug rod and the cylindrical housing is set at an inclination angle of 45 degrees with respect to the axis of the movable valve body. plug.   The hot and cold water mixing plug according to any one of claims 1 to 3, wherein the male screw portion formed on the temperature adjusting plug rod is composed of a double thread having a large lead.   The bias spring is when the movable valve body is moved to a position in contact with the hot water side valve seat than a spring constant when the movable valve body is moved to an intermediate position between the hot water side valve seat and the water side valve seat. The hot and cold water mixing tap according to any one of claims 1 to 4, comprising a single spring having at least two large and small spring constants so that the spring constant becomes large.   The hot and cold water mixing plug according to claim 5, wherein the bias spring is a coil spring wound spirally at an unequal pitch in the moving direction of the movable valve body.   6. The hot and cold water mixing tap according to claim 5, wherein the bias spring is a conical spring wound at an equal pitch or substantially an equal pitch in the moving direction of the movable valve body and gradually changing the diameter in the moving direction.

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