JP3791046B2 - Seal structure and hot water mixing apparatus using the same - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a seal structure having a sliding portion in the axial direction and a hot water mixing technique for adjusting a mixing ratio of hot water and water to obtain an appropriate temperature.
[0002]
[Prior art]
Conventionally, as a hot and cold water mixing apparatus having this type of seal structure, there has been one as shown in FIG. 8 (for example, JP-A-6-147333).
[0003]
In FIG. 8, a water inlet 1a and a hot water inlet 1b are opened in the peripheral wall of the housing 1 at intervals in the axial direction, and a mixed water outlet 1c is opened downstream from the inlets 1a and 1b. It is. The water inlet 1a communicates with the water supply chamber in the main body of the hot water mixing apparatus, and similarly, the hot water inlet 1b and the mixed water outlet 1c communicate with the hot water chamber and the mixing chamber, respectively. It is discharged from the discharge end.
[0004]
Inside the housing 1, a water valve seat 2 and a hot water valve seat 3 are provided on the water inlet 1a side and the hot water inlet 1b side, respectively. Between the water valve seat 2 and the hot water valve seat 3, a temperature regulating valve body 4 having a substantially H-shaped vertical cross section that is movable in the axial direction is incorporated. The valve body 4 has both ends in the axial direction as seating surfaces of the water valve seat 2 and the hot water valve seat 3, and a communication port 4b is opened in a partition wall 4a that partitions the water side and the hot water side. An annular packing 5 is incorporated around the valve body 4, and the packing 5 is brought into close contact with the inner wall of the housing 1 to shut off the water side and the hot water side.
[0005]
The interior of the housing 1 is partitioned into a water chamber 1d and a hot water chamber 1e by a valve body 4, and a mixing chamber 1f is formed downstream of these. Then, a sleeve 6 whose one end abuts against the partition wall 4a of the valve body 4 is incorporated from the mixing chamber 1f to the water chamber 1d. The sleeve 6 has an opening 6a for water in the peripheral wall facing the water chamber 1d, and a communication port for the partition wall 4a. It is formed in the inner diameter surrounding 4b. Then, the water chamber 1d, the hot water chamber 1e and the mixing chamber 1f are communicated with each other by the sleeve 6, and water and hot water in a quantity ratio corresponding to the valve opening degree of the valve body 4 with respect to the water valve seat 2 and the hot water valve seat 3 are mixed. To 1f.
[0006]
The mixing chamber 1f incorporates a shape memory alloy spring 7 having one end abutting against the inner wall of the housing 1 and the other end fitted into the end face of the sleeve 6. The spring 7 has a function of expanding and contracting according to the temperature of the mixed water passing through the mixing chamber 1f and shifting the valve body 4 so that the temperature of the discharged mixed water is maintained at the set temperature.
[0007]
The position of the valve body 4 is set by a handle 8 a of the spindle 8 screwed to the housing 1. One end of the spindle 8 is connected to the spring 7 via a slip washer, and the valve body 4 is set to a position corresponding to the set temperature value via the spring 7 by moving in the axial direction by operating the handle 8a. Further, a bias spring 9 for urging the valve body 4 in the opposite direction to the spring 7 is incorporated in the hot water chamber 1e, and this bias spring 9 has a function of moving the valve body 4 to the water valve seat 2 side, and sets the temperature. The position of the valve body 4 is balanced with respect to the spring 7, so that the mixing ratio of hot water and water is adjusted.
[0008]
However, in the configuration as described above, the packing 5 is integrated with the valve body 4 as shown in FIG. 9, so that the acting force F due to the differential pressure between the water supply pressure Pc and the hot water supply pressure PH pushes the valve body 4. Thus, the configuration as shown in FIG. 10 has been proposed due to the adverse effect of deviating from the set temperature. In FIG. 10, an annular recess 1h is provided in the inner wall guide 1g, and the packing 5 is fitted and held in the recess 1h, and the valve body 4 is pushed by the differential pressure between the water supply pressure Pc and the hot water supply pressure PH. It is explained that the value of the force F becomes zero and the set temperature can be stably maintained. Further, in order to reduce the sliding frictional force of the valve body 4 moving between the water inlet 1a and the hot water inlet 1b, the cross-sectional shape is a shape as shown in FIGS. 11 (a) to 11 (c) instead of the packing 5. A configuration in which a resin seal ring 10 is provided has also been proposed. In FIG. 11, reference numeral 10 a denotes a protrusion that contacts the inner wall of the housing 1, and the contact area is reduced to reduce the sliding frictional force.
[0009]
[Problems to be solved by the invention]
However, in reality, the structure shown in FIG. 10 does not have a configuration in which the effective pressure receiving area for pressing the valve body 4 by the action of the feed water pressure Pc and the hot water supply pressure PH is not zero. The acting force F due to the differential pressure of the pressure PH was not zero.
[0010]
Further, in the conventional hot and cold water mixing apparatus as described above, since the sliding frictional force of the packing 5 that shuts and seals between the water inlet 1a and the hot water inlet 1b is large, the force generated by the spring 7 and the bias spring 9 of the shape memory alloy It is necessary to reduce temperature hysteresis and temperature deviation by measures such as increasing both.
[0011]
For example, in FIG. 8, when the valve body 4 is stable at a position where the forces of the shape memory alloy spring 7 and the bias spring 9 are balanced, if the feed water pressure Pc changes and the temperature of the mixing chamber 1f changes, the shape changes. As the temperature of the spring 9 of the memory alloy changes, the force of the spring 9 should change, and the valve body 4 should be moved to maintain the set temperature. Migration is inhibited. 9 and 10, since the sliding surface with the packing 5 is a large diameter seal portion that is almost the same as the outer diameter of the valve body 4, the sliding frictional force due to the packing 5 is large. Similarly, the movement of the valve body 4 is inhibited by the sliding frictional resistance of the packing 5.
[0012]
Therefore, if the amount of change in the force of the spring 9 accompanying the temperature change is increased, the influence of the sliding friction due to the packing 5 can be relatively reduced. However, both the shape memory alloy spring 7 and the bias spring 9 have become thick and large springs in order to greatly change the generated force of the spring 9 with temperature change.
[0013]
Accordingly, the hot water / water mixing device is increased in size, the heat capacity of the thick and large shape memory alloy spring 7 is increased, the response time is delayed, the shape memory alloy spring 9 and the hot water / water mixing device are increased in cost, and the set temperature is increased. When changing, there were many problems such as heavy operation of the handle 8a.
[0014]
In addition, when the resin seal ring 10 is used as shown in FIG. 11, the valve body 4 is locked when scales or dust bite between the inner wall of the housing 1 and the protrusion 10 a when the valve body 4 slides. There is a problem in that the temperature cannot be adjusted because a gap is formed between the inner wall of the housing 1 and the protrusion 10a and leakage occurs between hot and cold water.
[0015]
Furthermore, when the seal ring 10 or the packing 5 is increased in thickness in the radial direction and interference occurs, the sliding frictional force of the valve body 4 may be significantly increased. That is, there is a problem that the dimensional accuracy of the inner diameter of the housing 1, the groove diameter of the valve body 4 and the thickness of the seal ring 10 is required, and the manufacturing cost is increased.
[0016]
The present invention solves the above-described problems, and provides a seal structure capable of reliably sealing without increasing the sliding frictional force in the axial direction even if the radial interference of the elastic seal member increases. This is the first issue.
[0017]
Another object of the present invention is to provide a hot and cold water mixing device that can effectively make the temperature sensitive body spring and the bias spring thin and small, has a quick response, is compact, and can be operated with a small driving force.
[0018]
A third problem is to provide a seal structure or a hot and cold mixing device that can be set accurately without damaging the elastic seal member during assembly, has good assembly properties, and is easy to maintain such as replacement of the elastic seal member. Yes.
[0019]
It is a fourth object to provide a compact seal structure or a hot and cold mixing device that is excellent in slidability and sealability between the valve element and the elastic seal member without requiring dimensional accuracy.
[0020]
Further, the fifth problem is to provide a compact sealing structure or a hot and cold water mixing device that improves the dimensional accuracy of the interference and is excellent in sliding and sealing properties between the valve body and the elastic sealing member even under high pressure. .
[0021]
[Means for Solving the Problems]
In order to solve the above-described problems, the present invention provides a holding groove provided on a part of the sliding guide surface for holding the elastic seal member, and a slide provided on the outer peripheral surface of the shaft member and sliding on the elastic seal member. An elastic seal member is provided that includes a moving groove, a holding portion held in the holding groove, and an elastic sliding portion that suppresses an increase in sliding frictional force in the axial direction due to an increase in the radial interference of the valve body. Is. Accordingly, the sliding groove can reduce the sliding diameter of the shaft member and reduce the absolute value of the sliding friction force, and the elastic sliding portion can suppress the increase in the sliding friction force in the axial direction due to an increase in interference. Is.
[0022]
DETAILED DESCRIPTION OF THE INVENTION
In order to solve the above-mentioned problems, the seal structure according to the first aspect of the present invention includes a housing in which a first fluid inlet and a second fluid inlet are axially spaced from each other in a circumferential wall, A shaft member that moves in the axial direction using the inner wall of the housing between the fluid inlet and the second fluid inlet as a sliding guide surface, and a holding groove that is provided in a part of the sliding guide surface and holds an elastic seal member And a sliding groove that is provided on the outer peripheral surface of the shaft member and slides against the elastic seal member, The housing is separable into a first fluid member having a first fluid inlet and a second fluid member having a second fluid inlet, from the first fluid member and the second fluid member. Forming a holding groove, The elastic seal member is constituted by a holding portion that is held in a holding groove, and an elastic sliding portion that suppresses an increase in sliding frictional force in the axial direction due to an increase in the radial interference of the shaft member.
[0023]
According to the above invention, the sliding diameter of the shaft member is reduced by the sliding groove and the absolute value of the sliding friction force can be reduced, and the increase in the sliding friction force in the axial direction due to the increase of interference is suppressed by the elastic sliding portion. Therefore, a sufficient interference can be secured, sealing can be performed reliably, and slidability can be maintained.
[0024]
According to a second aspect of the present invention, there is provided a hot and cold water mixing apparatus comprising: a housing in which a first fluid inlet through which water flows in and a second fluid inlet through which hot water flows are opened in a peripheral wall at an interval in an axial direction; A substantially cylindrical valve body that adjusts the mixing ratio of hot water and water with the inner wall of the housing between the water inlet and the hot water inlet as a sliding guide surface so as to be movable in the axial direction, and a valve on the water inlet side A water valve seat facing one end surface in the axial direction of the body, a hot water valve seat facing the other end surface in the axial direction of the valve body on the hot water inlet side, a mixed water outlet provided on the downstream side of the water valve seat, A temperature-sensitive body spring that urges the valve body in a direction that reduces the ratio of hot water as the temperature of the mixed water increases, a bias spring that urges the valve body in the opposite direction to the temperature-sensitive body spring, and two springs An urging force adjusting means for adjusting at least one of the urging forces to adjust the mixing temperature, and a portion of the sliding guide surface; Has a holding groove for holding a resilient sealing member, the sliding groove to slide relative provided elastic sealing member on the outer peripheral surface of a substantially cylindrical valve body, The housing is separable into a first fluid member having a first fluid inlet and a second fluid member having a second fluid inlet, from the first fluid member and the second fluid member. Forming a holding groove, The elastic seal member is composed of a holding portion that is held in a holding groove and an elastic sliding portion that suppresses an increase in sliding frictional force in the axial direction due to an increase in the radial interference of the valve element.
[0025]
In the above invention, the substantially cylindrical valve body slides and moves in the axial direction to a position where the temperature sensing body spring and the biasing force of the bias spring are balanced, resulting in a mixed water temperature set by the biasing force adjusting means. The elastic seal member provided on the outer peripheral surface of the substantially cylindrical valve body is held in the holding groove on the inner wall of the housing, and the sliding groove on the outer peripheral surface of the valve body is the elastic sliding portion of the elastic seal member. It moves relative to the sliding. Here, the sliding groove of the valve body that slides with the elastic seal member is thinner than the outer diameter of the valve body, so that the sliding contact surface becomes thinner and smaller, and the sliding frictional force with this elastic seal member can be reduced. The elastic sliding portion of the elastic seal member acts to suppress an increase in sliding frictional force in the axial direction due to an increase in interference. Therefore, the valve body can be driven with a small biasing force for both the temperature-sensitive body spring and the bias spring. From this, the temperature sensing spring and the bias spring are thin and small springs that act to operate with a small heat capacity and a high thermal response speed with respect to temperature changes, and to make the hot and cold mixing device small and compact.
[0026]
And above Claim 1 or 2 In the invention, at the time of assembling the valve body and the elastic seal member, first, the elastic seal member is fitted into the valve body, and then the valve body is set in either the first fluid member or the second fluid member. The member and the second fluid member Mating Thus, since the housing is formed, there is no need to press-fit the elastic seal member for assembly, and the elastic seal member can be reliably set without being damaged. Also, for maintenance such as when the elastic seal member deteriorates after long-term use, the elastic seal material can be easily replaced by dividing the housing.
[0027]
Claims 3 In the sealing structure of the invention described in (1), the elastic sealing member is constituted by a sealing layer having a substantially circular cross-sectional outer peripheral portion and an O-ring having a large number of hollow portions inside the sealing layer.
[0028]
In the above invention, the O-ring has a dimensional variation in the O-ring inner diameter, wire diameter, valve groove sliding groove diameter, or housing sliding guide surface diameter, and the compression interference increases. Since the inside is hollow, an increase in the pressing force to the valve body or the housing is suppressed as compared with a normal O-ring, so that the sliding frictional force in the axial direction of the valve body does not increase. In addition, since the outer peripheral seal layer has a substantially circular shape, a reliable seal can be achieved in the same manner as a normal O-ring.
[0029]
Hereinafter, a first embodiment of the present invention will be described with reference to FIG. FIG. 1 is a sectional view of a hot and cold water mixing apparatus according to a first embodiment of the present invention.
[0030]
In the figure, the peripheral wall of the housing 11 is provided with a water inlet 12 that is a first fluid inlet through which water flows in at an interval in the axial direction and a hot water inlet 13 that is a second fluid inlet through which hot water flows. While being opened, a mixed water outlet 14 is opened on the downstream side communicating with the inlets 12 and 13. The water inlet 12 communicates with the water chamber 15 in the main body of the hot water mixing apparatus, and similarly, the hot water inlet 13 and the mixed water outlet 14 communicate with the hot water chamber 16 and the mixing chamber 17, respectively. Thus, the mixed water reaches the mixed water outlet 14.
[0031]
In the housing 11, a water valve seat 18 and a hot water valve seat 19 are provided on the water inlet 12 side and the hot water inlet 13 side, respectively. Between the water valve seat 18 and the hot water valve seat 19, a valve body 20, which is a substantially cylindrical shaft member that is movable in the axial direction and adjusts the mixing ratio of hot water and water, is incorporated.
[0032]
Also, a temperature sensing body spring 21 that biases the valve body 20 in a direction that reduces the ratio of hot water as the temperature of the mixed water increases, and a bias that biases the valve body 20 in a direction opposite to the temperature sensing body spring 21. The urging force adjusting means 23 for adjusting the mixing temperature by varying the urging force of at least one of the two springs 21 and 22 in a configuration in which the valve body 20 is moved and positioned by balance of the force with the spring 22 is shown in FIG. In this embodiment, the bias spring 22 is adjusted. That is, when the handle 24 is rotated, the feed screw 25 is rotated, and the movable spring receiver 26 is advanced and retracted in the axial direction, and the biasing force of the bias spring 22 is adjusted.
[0033]
A holding groove 28 provided in a part of the sliding guide surface 27 that guides the outside of the valve body 20 with the inner wall of the housing 11 is a concave groove into which an outer periphery of an O-ring 29 that is an elastic seal member is fitted. The holding groove 28 holds the O-ring 29 in a fixed position even when the valve body 20 moves in the axial direction.
[0034]
Further, the sliding groove 30 provided on the outer peripheral surface of the substantially cylindrical valve body 20 has an outer diameter that is substantially the same as the inner diameter of the elastic seal member 29, and the maximum movement in the axial direction of the valve body 20 within the width of the O-ring 29. It is the structure which has the width | variety which added the width | variety. The temperature-sensitive body spring 21 can be a shape memory alloy spring, a bimetal spring, or the like. In particular, the shape memory alloy spring is preferable in terms of the generated force against a temperature change.
[0035]
As shown in FIG. 2, which is a partially enlarged cross-sectional view of FIG. 1, a seal layer 29a is formed on the O-ring 29 so that the shape of the O-ring 29 is the same as that of a normal O-ring. A large number of hollow portions 29b are provided therein. Here, the O-ring 29 has a radial interference due to the holding groove 28 and the sliding groove 30 so that there is no leakage between the hot and cold water. In the O-ring 29, the holding portion 29c is on the upper side of the seal layer 29a held in the holding groove 28, and the elastic sliding portion 29d is composed of the lower side of the seal layer 29a and a hollow portion 29b. Although not shown in FIG. 1, 31 and 32 in FIG. 2 are spring receiving rings.
[0036]
The operation in the above configuration will be described. Water and hot water are respectively supplied from the water inlet 12 and the hot water inlet 13, and the gap between the valve body 20 and the water valve seat 18 and the gap between the valve body 20 and the hot water valve seat 19 are described. Accordingly, it flows into the mixing chamber 31 while being mixed. The urging force of the temperature sensing spring 21 provided in the mixing chamber 17 changes according to the temperature, and the substantially cylindrical valve element 20 is located at a position where the urging force of the temperature sensing spring 21 and the bias spring 22 is balanced. By sliding and moving in the axial direction, the mixed water temperature set by the urging force adjusting means 23 is reached. At this time, the O-ring 29 provided on the outer peripheral surface of the substantially cylindrical valve body 20 is held in the holding groove 28 on the inner wall of the housing 11, and the sliding groove 30 on the outer peripheral surface of the valve body 20 is elastically sealed. It moves relative to the member 29 while sliding. Here, the outer diameter portion of the valve body 20 slides to such an extent that it lightly contacts the sliding guide surface 27 that is the inner wall of the housing 11, and the sliding frictional force is small, and the valve body 20 slides with the O-ring 29. Since the sliding groove 30 is thinner than the outer diameter of the valve body 20, the sliding contact surface becomes smaller and smaller, and the sliding frictional force with the O-ring 29 is also smaller. Accordingly, the valve body 20 can be driven with a small biasing force for both the temperature-sensitive body spring 21 and the bias spring 22. Therefore, since the temperature sensing spring 21 and the bias spring 22 can be made thin and small, the heat capacity is small, and the heat sensing spring 21 and the bias spring 22 operate sensitively and quickly with respect to temperature changes.
[0037]
In addition, since the O-ring 29 is provided with a large number of hollow portions 29b, dimensional variations occur in the wire diameter and inner diameter of the O-ring 29, the diameter of the sliding guide surface, the diameter of the sliding groove 30, and the like. Even if the interference of the O-ring is increased, an increase in reaction force accompanying an increase in the compressive strain is suppressed. That is, even if the interference of the O-ring 29 is increased, the pressing force of the O-ring 29 against the sliding groove 30 is significantly suppressed as compared with the normal O-ring, and thus the sliding frictional force of the valve body 20 is suppressed. . Further, a sealing layer 29a is provided on the outer periphery of the O-ring 29 so as to be substantially circular like a normal O-ring, and the hollow portion 29b does not open on the surface of the O-ring 29, so that a seal between hot water and water is ensured. It can be done.
[0038]
Further, the structure in which the holding groove 28 is formed in the housing 11 and the sliding groove 30 is formed in the valve body 20 has the effect of reducing the sliding friction force while ensuring the sealing performance, and the supply pressure of hot water or water. With respect to the fluctuation, the opening degree of the valve body 20 can be automatically corrected, and there is a specific effect that the mixing temperature performance can be stabilized. For example, when the supply water pressure of the water inlet 12 fluctuates due to opening / closing of other plugs, etc., the amount of water flowing into the mixing chamber 31 fluctuates according to the water pressure if the opening between the water valve seat 18 and the valve body 20 remains unchanged. As a result, the mixing ratio of hot water and water fluctuates and the mixed water temperature also fluctuates. However, when the supply water pressure rises, the water pressure in the sliding groove 30 of the valve body 20 also rises, and the elastic seal member 29 is fixed to the housing 11, so the water pressure in the sliding groove 30 It acts to bias the valve seat 18 side. Since the flow velocity between the valve body 20 and the water valve seat 18 is fast and the flow velocity within the sliding groove 30 is slow, the pressure between the valve body 20 and the water valve seat 18 is more slid according to Bernoulli's theorem. Lower than the pressure inside. Therefore, if the supply water pressure increases, the force for urging the valve body 20 toward the water valve seat 18 increases, and if the supply water pressure decreases, the force for urging the valve body 20 toward the water valve seat 18 will increase. Decrease. This also works on the hot water side. That is, the opening degree of the valve body 20 is automatically corrected so as to cancel the influence on the supply pressure fluctuation on both the hot water side and the water side.
[0039]
In other words, the temperature of the mixed water fluctuates and the temperature is transmitted to the temperature sensing spring 21, and the original action of moving the valve body 20 to keep the set temperature by changing the biasing force of the temperature sensing spring 21 is the temperature. In contrast to the correction operation after the fluctuation, the movement of the valve body 20 is corrected by the fluctuation pressure of the supply pressure before the temperature fluctuation occurs, so the temperature fluctuation can be prevented and suppressed in advance, and the stable temperature performance is achieved. can get.
[0040]
The spring receiving rings 31 and 32 prevent unnecessary torsion and twisting of the temperature sensing spring 21 and the bias spring 22 so that the valve body 32 can operate more stably and ensure an excellent temperature control function. It is.
[0041]
According to the first embodiment of the present invention, the holding groove 28 for holding the elastic seal member 29 in a part of the sliding guide surface 27 of the housing 11 and the sliding groove 30 on the outer peripheral surface of the valve body 20 are provided. According to the configuration, the sliding frictional resistance of the valve body 20 can be reduced, and the thin and small temperature-sensitive spring 21 can be formed. Therefore, it has excellent thermal response and operates quickly and sensitively to fluctuations in supplied hot water temperature and pressure. In addition, there is an effect that a stable mixing temperature can be obtained by automatically correcting the opening degree of the valve body 20 by the supply pressure fluctuation.
[0042]
Moreover, even if the interference of the O-ring increases, the O-ring 29 has a structure in which the outer peripheral portion of the O-ring 29 has a substantially circular shape and a large number of hollow portions 29b in the seal layer 29a. Since the increase in the sliding friction force can be suppressed, the allowable dimensions such as the wire diameter and inner diameter of the O-ring 29, the diameter of the sliding guide surface, and the diameter of the sliding groove 30 can be expanded while maintaining the above-described effects. . Accordingly, since dimensional accuracy is not required, mass productivity is improved and cost can be reduced.
[0043]
Furthermore, since the force of the two springs 21 and 22 can be reduced, the rotating operation of the handle 24 of the urging force adjusting means 23 is light and easy to operate, and a small and compact hot and cold water mixing device can be obtained.
[0044]
In the embodiment of FIG. 1, the case where the manual handle 24 is used as the urging force adjusting means 23 has been described. However, the same effect can be obtained not only by such manual operation but also by an electric drive means such as a motor. Can do.
[0045]
Next, a second embodiment of the present invention will be described with reference to FIG. FIG. 3 is a cross-sectional view of the main part of the hot and cold water mixing apparatus according to the second embodiment of the present invention.
[0046]
In FIG. 3, 33 is a housing, and the housing 33 is screwed. Mating The first fluid member 34 has a first fluid inlet that can be attached and detached, and the second fluid member 35 has a second fluid inlet. A water inlet 36 and a hot water inlet 37 are opened in the circumferential wall of the housing 33 at intervals in the axial direction, and a mixed water outlet 38 is provided on the downstream side communicating with the inlets 36 and 37. The water inlet 36 communicates with a water chamber 39 in the main body of the hot water mixing apparatus, and similarly, the hot water inlet 37 and the mixed water outlet 38 communicate with the hot water chamber 40 and the mixing chamber 41, respectively, via the mixing chamber 41. Thus, the mixed water reaches the mixed water outlet 38. A temperature detecting means 42 for detecting the temperature of the mixed water is provided in the middle of the flow path from the mixing chamber 41 to the mixed water outlet 38.
[0047]
Inside the housing 33, a water valve seat 43 and a hot water valve seat 44 are provided on the water inlet 36 side and the hot water inlet 37 side, respectively. Between the water valve seat 43 and the hot water valve seat 44, a substantially cylindrical valve body 45 that is movable in the axial direction and adjusts the mixing ratio of hot water and water is incorporated.
[0048]
In addition, a temperature sensing spring 46 that biases the valve body 45 in a direction that reduces the ratio of hot water as the temperature of the mixed water increases, and a bias that biases the valve body 45 in a direction opposite to the temperature sensing spring 46. The valve body 45 is moved and positioned by the balance of the force with the spring 47, and at least one of these two springs 46 and 47 is electrically biased as an urging force adjusting means for adjusting the mixing temperature by varying the urging force. The force adjusting means 48 is configured to adjust the bias spring 47 in the embodiment of FIG. That is, when the output shaft 50 of the motor 49 which is the electrical biasing force adjusting means 48 is rotated, the screw shaft 51 is rotated, and the movable spring receiver 52 is advanced and retracted in the axial direction, and the biasing force of the bias spring 47 is adjusted. .
[0049]
Further, the sliding guide surface 53 that guides the outside of the valve body 45 with the inner wall of the housing 33 and the holding groove 54 provided in a part of the sliding guide surface 53 are centered on the holding groove 54 and the water side is the first side. The fluid member 34 and the hot water side are constituted by a second fluid member 35. That is, the holding groove 54 can be divided from its center. The holding groove 54 is a concave groove into which a holding portion 56 provided on the outer peripheral side of the elastic seal member 55 is fitted. With this holding groove 54, even if the valve body 45 moves in the axial direction, the elastic seal member 55 is in a fixed position. Is retained. The elastic seal member 55 has a substantially Y-shaped cross section as shown in FIG. 4 which is a partially enlarged cross-sectional view of FIG. In addition, the other two pieces on the inner peripheral side of the portion 56 are elastic sliding portions 58 that slide with the sliding grooves 57 of the valve body 45.
[0050]
The sliding groove 57 provided on the outer peripheral surface of the substantially cylindrical valve body 45 has an outer diameter larger than the inner diameter of the elastic sliding portion 58 of the elastic seal member 55 and has a valve body 45 in the width of the elastic sliding portion 58. It is the structure which has the width | variety which added the maximum movement width | variety of this axial direction. Here, the interference of the elastic seal member 55 is absorbed not by the compressive strain of the holding portion 56 but by the bending strain of the elastic sliding portion 58. As the temperature sensing spring 46, a shape memory alloy spring, a bimetal spring, or the like can be used. In particular, the shape memory alloy spring is preferable in terms of a generating force with respect to temperature change.
[0051]
Further, the temperature setting means 59 for setting the target value of the mixed water temperature, and the electrical biasing force adjustment means 49 are controlled based on the temperature detected by the temperature detection means 42 and the target value set by the temperature setting means 59. The electronic control means 60 is provided.
[0052]
In the above configuration, water and hot water are supplied from the water inlet 36 and the hot water inlet 37, respectively, and mixing is performed according to the gap between the valve body 45 and the water valve seat 43 and the gap between the valve body 45 and the hot water valve seat 44. It flows into the chamber 41 while being mixed. The urging force of the temperature sensing spring 46 provided in the mixing chamber 41 changes according to the temperature, and the substantially cylindrical valve element 45 is located at a position where the urging force of the temperature sensing spring 46 and the bias spring 47 is balanced. By sliding and moving in the axial direction, the temperature of the mixed water becomes a temperature corresponding to the biasing force of the bias spring 47 determined by changing the position of the movable spring receiver 52 by the electrical biasing force adjusting means 48. At this time, the holding portion 56 of the elastic seal member 55 provided on the outer peripheral surface of the substantially cylindrical valve body 45 is held in the holding groove 54 on the inner wall of the housing 33, and the sliding groove on the outer peripheral surface of the valve body 45. 57 moves relative to the elastic sliding portion 58 of the elastic seal member 55 while sliding. Here, the outer diameter portion of the valve body 45 slides to such an extent that it is in light contact with the sliding guide surface 53 that is the inner wall of the housing 33, and this sliding frictional force is small, and the elastic sliding portion 58 of the elastic seal member 55. Since the sliding groove 57 of the valve body 45 that slides is thinner than the outer diameter of the valve body 45, the sliding contact surface becomes thinner and smaller, and the sliding frictional force with the elastic seal member 55 is also smaller. Therefore, both the temperature sensing spring 46 and the bias spring 47 can drive the valve body 45 with a small biasing force. Therefore, since the temperature sensing spring 46 and the bias spring 47 can be made thin and small, the heat capacity is small, and the heat sensing spring 46 and the bias spring 47 operate quickly and sensitively to temperature changes.
[0053]
Even if the thickness and inner diameter of the elastic seal member 55, the diameter of the sliding guide surface 53, the diameter of the sliding groove 30 and the like are varied, and the interference of the elastic seal member 55 is increased, the elastic seal member 55 is interference. Since the increase is absorbed not by the compressive strain but by the bending strain of the elastic sliding portion 58, the increase of the reaction force accompanying the increase of the interference is suppressed. That is, even if the interference of the elastic seal member 55 increases, the pressing force of the elastic sliding portion 58 against the sliding groove 30 is suppressed, so that the sliding frictional force of the valve body 20 is suppressed.
[0054]
Further, since the elastic sliding portion 58 is pressed inward by the pressure of water and hot water from the outer peripheral side and comes into close contact with the sliding groove 57, it has a good sealing property and scales and dust are not easily bitten. By the way, if the thickness of the elastic sliding part is thin (preferably 0.2 mm to 1 mm), even if dust or scale bites, the elastic sliding part is adapted to the shape, and the sealing property can be secured, The sliding frictional force does not increase and the valve element can be prevented from locking. The holding part 56 comprises a holding groove 54 made up of the first fluid member 34 and the second fluid member 35 so as to be in close contact with the holding groove. Mating This prevents leakage from the gap and leakage on the outer peripheral side of the elastic seal member 55. Therefore, the first fluid member 34 and the second fluid member 35 Mating There is no need for sealing tape or packing.
[0055]
Since the housing 33 can be divided into the first fluid member 34 and the second fluid member 35, at the time of assembly, the elastic seal member 55 is first set in the sliding groove 57 of the valve body 45, and the holding member 56 holds the valve body 45. The first fluid member 34 is inserted into the holding groove 56 of the second fluid member 35. Fitting You just need to match. Therefore, it is not necessary to press-fit the elastic seal member 55 from the sliding guide surface 53, and damage to the elastic seal member 55 can be prevented. Further, even if the elastic seal member 55 is deteriorated and needs to be replaced after being used for a long time, the valve body 45 does not have to be forcibly removed if the first fluid member 34 is removed. Maintenance can be performed without damaging the 33 sliding guide surfaces 53.
[0056]
Further, the structure in which the holding groove 54 is formed in the housing 33 and the sliding groove 57 is formed in the valve body 45, in addition to the effect of reducing the sliding frictional force while ensuring the sealing performance, There is a specific effect that the opening degree of the valve body 45 can be automatically corrected with respect to the fluctuation and the mixing temperature performance can be stabilized. For example, when the supply water pressure at the water inlet 36 varies due to opening / closing of other plugs, etc., the amount of water flowing into the mixing chamber 41 varies according to the water pressure if the opening between the water valve seat 43 and the valve body 45 remains unchanged. As a result, the mixing ratio of hot water and water fluctuates and the mixed water temperature also fluctuates. However, when the supply water pressure rises, the water pressure in the sliding groove 57 of the valve body 45 also rises, and the elastic seal member 55 is fixed to the housing 47, so the water pressure in the sliding groove 57 It acts to urge the valve seat 43 side. Since the flow velocity between the valve body 45 and the water valve seat 43 is fast and the flow velocity in the sliding groove 37 is slow, the pressure between the valve body 45 and the water valve seat 43 is more slid according to Bernoulli's theorem. Lower than the pressure inside. Therefore, if the supply water pressure increases, the force that urges the valve body 45 toward the water valve seat 43 increases, and if the supply water pressure decreases, the force that urges the valve body 45 toward the water valve seat 43 side increases. Decrease. This also works on the hot water side. That is, the opening degree of the valve body 57 is automatically corrected so as to cancel the influence on the supply pressure fluctuation on both the hot water side and the water side.
[0057]
In other words, the temperature of the mixed water fluctuates and the temperature is transmitted to the temperature sensing spring 46, and the original action of moving the valve element 45 to keep the set temperature by changing the biasing force of the temperature sensing spring 46 is the temperature. In contrast to the correction operation after the fluctuation, the movement of the valve body 45 is corrected by the fluctuation pressure of the supply pressure before the temperature fluctuation occurs, so that the temperature fluctuation can be suppressed and prevented in advance.
[0058]
Furthermore, even when a temperature deviation occurs due to hysteresis of the temperature sensing spring 46 or slight sliding friction of the valve body 45, the temperature detection means 42 detects the temperature of the mixed water and feeds it back to the electronic control means 60. Since the electronic control unit 60 controls the electrical biasing force adjusting unit 48 in a direction to eliminate the deviation as compared with the temperature set by the temperature setting unit 59, a temperature deviation with respect to the temperature set by the temperature setting unit 59, Stable temperature performance with very little so-called temperature offset can be obtained.
[0059]
In addition, since the sliding frictional force of the valve body 45 is small as described above, the temperature sensing spring 46 and the bias spring 47 can be made thin and have a small biasing force, so that the driving force of the electrical biasing force adjusting means 48 can also be reduced. For example, it can be a small low torque motor.
[0060]
According to the second embodiment of the present invention, both the temperature sensing spring 46 and the bias spring 47 can drive the valve element 45 with a small urging force, and the electric urging force adjusting means 48 with a small driving force can respond quickly. The mixing temperature can be controlled. In addition, since the electronic control means 60 controls the electrical biasing force adjusting means 48 based on the temperature detected by the temperature detecting means 42 and the target value set by the temperature setting means 59, the effect that stable temperature control can be performed. There is.
[0061]
Even if the thickness and inner diameter of the elastic seal member 55, the diameter of the sliding guide surface 53, the diameter of the sliding groove 30 and the like vary, and the interference of the elastic seal member 55 increases, the elastic seal member 55 is increased. Since the increase in the interference is absorbed not by the compressive strain but by the bending strain of the elastic sliding portion 58, the increase in the reaction force accompanying the increase in the interference is suppressed. That is, even if the interference of the elastic seal member 55 is increased, the pressing force of the elastic sliding portion 58 against the sliding groove 30 is suppressed, so that the sliding frictional force of the valve body 20 is suppressed, and the above effect is achieved with dimensional accuracy. It can be realized without requiring.
[0062]
Furthermore, the sealing property is good, and it is difficult for the scale and dust to bite, and even if the dust or scale is bitten, the sealing property can be secured, the sliding frictional force does not increase, and the valve body can be prevented from being locked.
[0063]
Since the housing 33 can be divided into the first fluid member 34 and the second fluid member 35, it is not necessary to press-fit the elastic seal member 55 from the sliding guide surface 53 at the time of assembly, thereby preventing the elastic seal member 55 from being damaged. it can. Further, since the elastic seal member 55 and the valve body 45 need not be forcibly removed when the elastic seal member 55 and the valve body 45 are attached or detached, the valve body 45 or the sliding guide surface 53 of the housing 33 can be easily damaged. Maintenance can be performed.
[0064]
Next, a third embodiment of the present invention will be described with reference to FIG. FIG. 5 is a partially enlarged cross-sectional view of a hot and cold water mixing apparatus according to a third embodiment of the present invention. The third embodiment differs from the second embodiment in that an arcuate fixing portion 61 protruding in the axial direction from the holding portion 56 of the elastic seal member, and holding the fixing portion 61 in the radial direction of the holding portion. In other words, the radial holding groove 62 for preventing the deviation is provided, and the arc surface of the fixing portion 61 is in close contact with the radial holding groove 62.
[0065]
In the above configuration, the fixing portion 61 is held in the radial holding groove 62 of the first fluid member 34 and the second fluid member 35, so that the positioning can be easily performed during assembly, and the radial displacement can be prevented during setting. Does not occur. Accordingly, the shaft of the valve body 45 is less likely to be displaced with respect to the shafts of the temperature sensitive body spring 46, the bias spring 47, and the sliding guide portion 53, preventing the valve body 45 from being inclined and the interference of the elastic seal member 55. Therefore, it is possible to prevent an increase in the sliding resistance of the valve body and improve the reliability of the seal. Moreover, the water side pressure is high, and the first fluid member 34 and the second fluid member 35 Mating When a high pressure is applied to the outer peripheral portion of the elastic seal member 55 through the gap, the elastic seal member 55 tends to collapse inward, but the fixing portion 61 is held by the radial holding portion 62, so the elastic seal member 55 is held. There is no slipping out of the groove 54 or inward. That is, even if force is applied from the outer peripheral portion of the elastic seal member 55, the interference does not increase, and an increase in sliding frictional force can be prevented. Further, the sealing is performed by both the holding groove 54 and the radial holding groove 62 of the elastic seal member 55, so that the reliability of the seal can be improved.
[0066]
According to the third embodiment of the present invention, since the shaft of the valve body 45 is prevented and the interference of the elastic seal member 55 is made uniform, an increase in the sliding resistance of the valve body can be prevented and the reliability of the seal can be increased. Can be improved.
[0067]
In addition, since the elastic seal member 55 is not detached from the holding groove 54 or displaced inward, the interference does not increase even if a force is applied from the outer peripheral portion of the elastic seal member 55, thereby preventing an increase in sliding frictional force. Can do.
[0068]
In the second and third embodiments, by using grease between the sliding groove 57 and the sliding elastic portion 58, the sliding friction force can be further reduced, and the sliding groove 57 and the sliding elastic portion 58 can be reduced. Scales and garbage can be prevented from biting between the two. In addition, since the sealing property is good, the outflow of grease can be suppressed, and the sliding frictional force can be reduced over a long period of time.
[0069]
FIG. 6 is a sectional view of an automatic pressure regulating valve 63 having a seal structure showing a fourth embodiment of the present invention, and FIG. 7 is a partially enlarged sectional view of FIG. In the figure, reference numeral 64 denotes a housing, and a water inlet 65 serving as a first fluid inlet and a hot water inlet 66 serving as a second fluid inlet are provided on the peripheral wall of the housing 64 at intervals in the axial direction. . The water inlet 65 communicates with the water outlet 69 via the water primary chamber 67 and the water secondary chamber 68 in the main body of the automatic pressure regulating valve 63, and similarly, the hot water inlet 66 is the hot water primary chamber 70 and the hot water secondary chamber 71. To the hot water outlet 72. Inside the housing 64, a water valve seat 73 is provided at the boundary between the water primary chamber 67 and the water secondary chamber 68, and a water valve seat 74 is provided at the boundary between the hot water primary chamber 70 and the hot water secondary chamber 71.
[0070]
A shaft member 75 connects a water side valve body 76 that separates the water primary chamber 67 and the water secondary chamber 68, a hot water side valve body 77 that separates the hot water primary chamber 70 and the hot water secondary chamber 71, and the center of the shaft member 75. Is provided with a sliding portion 79 that slides on the sliding guide surface 78 of the housing 64. The water side valve body 76 and the hot water side valve body 77 can move in the axial direction between the water valve seat 73 and the hot water valve seat 74, and the primary side pressures of water and hot water respectively according to the lift amount. The pressure is reduced. Further, the outer diameter of the sliding portion 79 and the outer diameter of the water side valve body 76 and the hot water side valve body 77 are made substantially the same, and the pressure receiving area of the sliding portion 79 and the water side valve in the water primary chamber 67 and the hot water primary chamber 70 are set. The primary chamber pressure receiving areas of the body 76 and the hot water side valve body 77 are substantially matched to eliminate the influence of the primary pressure.
[0071]
Further, the holding groove 80 provided in a part of the sliding guide surface 78 that guides the outside of the sliding portion 79 with the inner wall of the housing 64 is a holding portion formed of two pieces on the outer peripheral side of the X ring 81 that is an elastic seal member. The holding groove 80 holds the X ring 81 in a fixed position even when the sliding portion 79 (shaft member 75) moves in the axial direction.
[0072]
The sliding groove 83 provided on the outer peripheral surface of the sliding portion 79 is substantially the same as the elastic sliding portion 84 formed of two pieces on the inner diameter side of the X ring 81, and the outer diameter of the X ring 81 having interference. Thus, the X ring 81 has a width obtained by adding the maximum movement width in the axial direction of the shaft member 75 to the width of the X ring 81.
[0073]
Guide portions 85 and 86 are provided to prevent the shaft member 75 from being twisted. Reference numeral 87 denotes an insertion hole for inserting the shaft member 75 at the time of assembly. After the shaft member 75 is inserted, a plug 88 provided with a guide portion 85 is screwed.
[0074]
The operation of the present embodiment with the above configuration will be described. Considering the force applied to the shaft member 75, the water primary chamber 67 and the hot water primary chamber 70 are sealed by the X ring 81, so that the water side and the hot water side may be considered separately. The pressure receiving surface of the water primary chamber 67 in the axial direction of the water primary pressure is the surface of the sliding portion 79 and the water side valve body 76 on the primary chamber 67 side and the surface of the sliding groove 83 on the water side. The sliding portion 79 receives the pressure on the right side in the axial direction on the surface of the water side valve body 76 on the primary chamber 67 side and the surface on the sliding groove 83 water side. Since the sum of the pressure receiving area of the sliding portion 79 and the pressure receiving area of the surface on the primary chamber 67 side of the water side valve element 76 and the surface on the sliding groove 83 water side is equal and the axial force is offset, the water primary In the chamber 67, the influence of the water primary pressure on the shaft member 75 can be ignored. Here, since the force in the axial direction is considered, the pressure receiving area is an area projected onto a plane perpendicular to the axis. Similarly, the pressure receiving surface in the axial direction of the hot water primary pressure in the hot water primary chamber 70 is the surface on the primary chamber 70 side of the sliding portion 79 and the hot water side valve body 77 and the surface on the sliding groove 83 hot water side. It is the sliding portion 79 that receives pressure on the right side, and the surface on the primary chamber 70 side and the surface on the sliding groove 83 side that receives pressure on the left side in the axial direction. Since the sum of the pressure receiving area of the sliding portion 79 and the pressure receiving area of the surface on the primary chamber 70 side of the hot water side valve element 77 and the surface of the sliding groove 83 on the hot water side are equal and the axial force is offset, The influence of the hot water primary pressure in the chamber 70 on the shaft member 75 can be ignored. Therefore, the force to move in the axial direction of the shaft member 75 is only the influence of the secondary pressure received by the water side and hot water side valve bodies 76 and 77 on the water and hot water secondary chambers 68 and 71 side. That is, the secondary pressure of the water and hot water secondary chambers 68 and 71 is moved in the axial direction by the force exerted on the water side valve body and the hot water side valve bodies 76 and 77 (that is, the pressure difference between the hot water and the secondary pressure of water). Here, since the secondary side pressure receiving areas of the water side valve body 76 and the hot water side valve body 77 are equal, the shaft member 75 moves from the side where the secondary pressure of hot water and water is higher to the side where the secondary pressure is lower. The valve opening on the higher side is reduced and the valve opening on the lower pressure side is increased. Therefore, the secondary pressure decreases due to an increase in pressure loss due to the valve on the high pressure side, and the secondary pressure increases due to a decrease in pressure loss due to the valve on the low pressure side. And when the secondary side pressure of hot water and water becomes equal, all axial forces of the shaft member 75 are balanced, and the shaft member 75 stops. That is, when the pressure balance of the secondary pressure is lost, the shaft member 75 moves due to the pressure difference, and the lift of the water side valve body 76 and the hot water side valve body 77 changes accordingly, thereby changing the rate of reduction of the primary pressure. The secondary pressure is equalized.
[0075]
At this time, if the sliding resistance of the sliding portion 79 or the seal portion is large, the shaft member 75 does not move until a force exceeding the sliding resistance is applied to the shaft member 75. That is, a pressure difference corresponding to the sliding resistance is generated in the secondary side pressure, and the pressure difference increases as the sliding resistance increases.
[0076]
However, the holding portion 82 of the X ring 81 provided on the outer peripheral surface of the shaft member 75 is held in the holding groove 80 on the inner wall of the housing 64, and the sliding groove 83 on the outer peripheral surface of the shaft member 75 is formed on the X ring 81. It moves relative to the elastic sliding portion 84 while sliding. Here, the outer diameter portion of the shaft member 75 slides to such an extent that it makes a slight contact with the sliding guide surface 78 that is the inner wall of the housing 64, and this sliding frictional force is small, and the elastic sliding portion 84 of the X ring 81 Since the sliding groove 83 of the sliding shaft member 75 is thinner than the outer diameter of the sliding portion 79, the sliding contact surface becomes thinner and smaller, and the sliding frictional force with the X ring 81 is also smaller. For this reason, the pressure equalization can be accurately performed with almost no pressure difference between the water secondary pressure and the hot water secondary pressure. Further, since the sliding resistance is small, the primary pressure of water or hot water fluctuates, and even if the shaft member 75 moves, it operates sensitively and quickly.
[0077]
Even if the thickness and inner diameter of the X ring 81, the diameter of the sliding guide surface 78, the diameter of the sliding groove 83, and the like are varied, and the interference of the X ring 81 increases, the interference of the X ring 81 increases. Is absorbed not by compressive strain but by bending strain of each piece of the elastic sliding portion 84 and the holding portion 82, so that an increase in reaction force accompanying an increase in interference is suppressed. That is, even if the interference of the X ring 81 increases, the pressing force of the elastic sliding portion 84 against the sliding groove 83 is suppressed, so that the sliding frictional force of the shaft member 75 is suppressed.
[0078]
As described above, according to the present embodiment, the sliding groove 83 of the shaft member 75 that slides with the elastic sliding portion 84 of the X ring 81 is thinner than the outer diameter of the sliding portion 79. The dynamic contact surface is thin and small, and the sliding frictional force with the X-ring 81 is also small, so that the pressure difference between the water secondary pressure and the hot water secondary pressure hardly occurs, and the pressure can be equalized sensitively and accurately. .
[0079]
Further, since the X ring 81 absorbs the increase in interference by not the compressive strain but the bending strain of each piece of the elastic sliding portion 84 and the holding portion 82, the elastic sliding does not occur even if the interference of the X ring 81 increases. The pressing force of the portion 84 against the sliding groove 83 is suppressed, and the sliding frictional force of the shaft member 75 can be suppressed. Accordingly, mass productivity can be improved and cost can be reduced without requiring dimensional accuracy.
[0080]
In addition to the first to fourth embodiments of the present invention, the same effect can be obtained as long as the shaft member or the valve body slides in the axial direction.
[0081]
【The invention's effect】
As described above, the seal structure of the present invention is Slid Because the sliding diameter of the shaft member is reduced by the moving groove, the absolute value of the sliding friction force can be reduced, and the elastic sliding portion acts so that the increase of the sliding friction force in the axial direction due to the increase of interference is suppressed. Sufficient interference can be secured, sealing can be performed reliably, and slidability can be maintained.
[0082]
Moreover, the hot and cold water mixing apparatus of the present invention Slid The dynamic friction force can be reduced, and the elastic sliding part of the elastic seal member acts to suppress the increase of the sliding frictional force in the axial direction by increasing the interference, so that both the temperature sensing spring and the bias spring have a small biasing force. The valve body can be driven, and the temperature sensing spring and bias spring are thin and small springs that act to operate with a small heat capacity and a high thermal response speed in response to temperature changes. It can be done.
[0083]
Further, the housing can be divided into a first fluid member and a second fluid member, and a holding groove is formed from the first fluid member and the second fluid member, so that the elastic seal member is press-fitted and assembled. Therefore, the elastic sealing member can be reliably set without being damaged. Also, for maintenance such as when the elastic seal member deteriorates after long-term use, the elastic seal material can be easily replaced by dividing the housing.
[0084]
In addition, since the elastic seal member is composed of a seal layer having a substantially circular outer peripheral portion in cross section and an O-ring having a large number of hollow portions inside the seal layer, even if the interference of compression of the O-ring increases, the internal Since this is hollow, an increase in the pressing force against the valve body or the housing is suppressed as compared with a normal O-ring, so that there is an effect that the sliding frictional force in the axial direction of the valve body is not increased. Further, since the outer peripheral seal layer is substantially circular like a normal O-ring, reliable sealing is possible.
[Brief description of the drawings]
FIG. 1 is a sectional view of a hot and cold water mixing apparatus according to a first embodiment of the present invention.
[Fig. 2] Partial enlarged sectional view of the hot water mixing device
FIG. 3 is a cross-sectional configuration diagram of the main part of a hot and cold water mixing apparatus according to a second embodiment of the present invention.
FIG. 4 is a partially enlarged sectional view of the hot water mixing device.
FIG. 5 is a partially enlarged sectional view of a hot and cold water mixing apparatus according to a third embodiment of the present invention.
FIG. 6 is a sectional view of an automatic pressure regulating valve according to a fourth embodiment of the present invention.
FIG. 7 is a partially enlarged sectional view of the automatic pressure regulating valve.
FIG. 8 is a sectional view of a conventional hot and cold water mixing device.
FIG. 9 is a partially enlarged sectional view of the hot water mixing device.
FIG. 10 is a partially enlarged sectional view of the hot water mixing apparatus.
FIG. 11 (a) is a partially enlarged cross-sectional view of a tool ring provided with a protrusion at the center of a conventional hot water mixing apparatus.
(B) Partially enlarged sectional view of a tool ring provided with protrusions at both ends of a conventional hot and cold mixing device
(C) Partial enlarged sectional view of a tool ring provided with protrusions at the center and both ends of a conventional hot water mixing apparatus
[Explanation of symbols]
11 Housing
12 Water inlet
13 Hot water entrance
14 Mixed water outlet
18 Water valve seat
19 Hot spring seat
20 Disc
21 Temperature sensing spring
22 Bias spring
23 Energizing force adjusting means
27 Sliding guide surface
28 Holding groove
29 O-ring (elastic seal member)
29c holder
29d Elastic sliding part
30 Sliding groove
48 Electric biasing force adjusting means (biasing force adjusting means)
53 Sliding guide surface
54 Holding groove
55 Elastic seal member
56 Holding part
57 Sliding groove
58 Elastic sliding part
61 Fixed part
62 Radial retaining groove
64 housing
65 Water inlet (first fluid inlet)
66 Hot water inlet (second fluid inlet)
75 Shaft member
78 Sliding guide surface
79 Sliding part
80 Holding groove
81 X ring (elastic seal member)
82 Holding part
83 Sliding groove
84 Elastic sliding part

Claims (3)

A housing in which a first fluid inlet and a second fluid inlet are axially spaced in a peripheral wall; and an inner wall of the housing between the first fluid inlet and the second fluid inlet A shaft member that moves in the axial direction using the sliding guide surface as a sliding guide surface, a holding groove that is provided in a part of the sliding guide surface and holds an elastic seal member, and an outer peripheral surface of the shaft member that is provided on the elastic seal member A sliding groove that slides relative to the housing , the housing being separable into a first fluid member having a first fluid inlet and a second fluid member having a second fluid inlet; The fluid member and the second fluid member constitute a holding groove, and the elastic seal member slides in the axial direction due to an increase in the radial interference of the shaft member and the holding portion held in the holding groove. Seal structure consisting of elastic sliding parts that suppress increase in dynamic friction force. A housing in which a first fluid inlet through which water flows in and a second fluid inlet through which hot water flows in are spaced apart in the axial direction on a peripheral wall; and the housing between the water inlet and the hot water inlet A substantially cylindrical valve body that adjusts the mixing ratio of hot water and water that is movably incorporated in the axial direction using the inner wall of the valve as a sliding guide surface, and is opposed to one end surface in the axial direction of the valve body on the water inlet side A water valve seat, a hot water valve seat facing the other end surface in the axial direction of the valve body on the hot water inlet side, a mixed water outlet provided downstream of the water valve seat, and a temperature rise of the mixed water And a bias spring that biases the valve body in a direction opposite to the temperature sensing spring, and at least one of the two springs. An urging force adjusting means for adjusting the mixing temperature by varying the urging force of the sliding guide surface; A holding groove for holding a resilient sealing member provided on, provided on the outer peripheral surface of the substantially cylindrical the valve body has a sliding groove to slide relative to the elastic sealing member, the housing first fluid A first fluid member having an inlet and a second fluid member having a second fluid inlet can be divided, and a holding groove is configured from the first fluid member and the second fluid member, The elastic sealing member is a hot and cold mixing device comprising a holding portion held in the holding groove and an elastic sliding portion that suppresses an increase in sliding frictional force in the axial direction due to an increase in the interference in the radial direction of the valve body. The seal structure according to claim 1, wherein the elastic seal member is configured by a seal layer having a substantially circular cross-sectional outer peripheral portion and an O-ring having a large number of hollow portions inside the seal layer.

Images