JP2018084285A - Mixing valve unit - Google Patents

Abstract

PROBLEM TO BE SOLVED: To integrate a part including a mixing valve with a part including a solenoid valve.SOLUTION: A mixing valve unit is provided integrally with: a water supply passage 3 through which low-temperature water passes; a hot water passage 4 through which high-temperature water passes; a mixing valve M for mixing low-temperature water with high-temperature water; a hot water tapping passage 18 through which mixed hot water adjusted by the mixing valve M passes; a bypass passage 8 of which one end side is communicated to the water supply passage 3 and the other end side is communicated to the hot water tapping passage 18; and a solenoid valve EV which closes the bypass passage 8 during energization and opens the bypass passage during non-energization.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a mixing valve unit.

  In the hot water supply system disclosed in Patent Document 1 below, a water supply pipe connected to the upper water inlet side of the mixing valve and a hot water pipe connected to the hot water outlet side of the mixing valve are connected by a bypass pipe. The bypass pipe is provided with a solenoid valve that shuts off the flow path of the bypass pipe when energized. FIG. 6 is a diagram showing an outline of the above system for reference.

  With such a configuration, when energized, water and hot water are mixed by the mixing valve MV and supplied to the bathtub 52 and the like through the hot water pipe 50 and the mixing pipe 51. Moreover, since the solenoid valve EV installed in the bypass pipe 53 opens the flow path of the bypass pipe 53 at the time of a power failure, the hot water sent from the heat storage tank at the time of a power failure is in a state where a certain amount of low-temperature water is reliably mixed. 52. Therefore, even during a power outage, hot water can be supplied using hot water stored in the heat storage tank while reliably preventing high temperature hot water, and the usability of the hot water supply system can be improved.

JP 2003-42540 A

  However, with the above configuration, the mixing valve MV and the electromagnetic valve EV are configured separately. Therefore, not only the number of parts increases, but also the outlet of the mixing valve MV and the outlet of the electromagnetic valve EV must be connected by piping such as the hot water outlet pipe 50 and the bypass pipe 53, respectively. In addition, the supply of low temperature water to high temperature hot water tends to be delayed due to the presence of connection piping. That is, there was a problem that the response of mixing water with high-temperature hot water deteriorated.

  The present invention has been completed based on the above-described circumstances. For example, when a power failure occurs, a mixing valve unit capable of mixing water in a short time with high response to high-temperature hot water. The purpose is to provide.

  The mixing valve unit of the present invention includes a water supply passage through which low temperature water passes, a hot water passage through which high temperature water passes, a mixing valve that mixes the low temperature water and the high temperature water, and mixed hot water adjusted by the mixing valve. A hot water passage through which the water passes, a bypass passage whose one end communicates with the water supply passage and the other end communicates with the hot water passage, and an electromagnetic on-off valve which closes the bypass passage when energized and opens when not energized. It is characterized by being provided.

According to the present invention, since the bypass path is normally closed by the electromagnetic on-off valve, the water and hot water are adjusted from the outlet with the mixing condition adjusted by the mixing valve.
As described above, the electromagnetic on-off valve normally keeps the bus path closed, but in the unlikely event of a power failure, the bypass is opened so that hot water is mixed through the bypass. be able to. Therefore, high temperature hot water does not occur in a situation not intended by the user. At this time, the bypass path and the hot water path are not connected via a pipe as in the prior art, but in the present invention, the entire mixing valve unit is integrated and the bypass path and the hot water path do not pass through the pipe. Since it is directly connected, water can be mixed in a short time with high response to hot water.

It is sectional drawing which shows the valve opening state of a solenoid valve in the mixing valve unit which concerns on a present Example. It is the sectional view on the AA line of FIG. 1, and shows the state which the mixing valve fully opened the high temperature hot water side. Similarly, the mixing valve shows a state in which the hot and cold water sides are each half open. Similarly, the mixing valve shows a state where the low temperature water side is fully opened. Cross section of the mixing valve unit showing the closed state of the solenoid valve It is a figure which shows the conventional hot-water supply system.

A preferred embodiment of the present invention will be described.
(1) The electromagnetic on-off valve in the mixing valve unit of the present invention may be a pilot-type electromagnetic on-off valve.

According to the configuration as described above, the electromagnetic on-off valve is not a direct acting type electromagnetic on-off valve, but opens with a weak force, that is, a type that does not require a large pressure difference between the front and back of the valve body when the valve body is opened. Therefore, the pressure difference (pressure loss) between the primary side and the secondary side of the electromagnetic on-off valve can be reduced. For this reason, since the water mixed at the time of a power failure etc. is hold | maintained in the state with comparatively high pressure, hot water can be stirred favorably.
(2) The mixing valve unit of the present invention includes a first casing in which a housing chamber for housing the water supply channel, the hot water channel, and the mixing valve body of the mixing valve is formed, the bypass channel, the hot water channel, and the electromagnetic It is preferable to have a structure including a second casing that accommodates the first on-off valve and has a valve seat that is opened and closed by the electromagnetic on-off valve and can be assembled to the first casing.
According to the above configuration, since the casing of the mixing valve unit is divided into two parts and can be assembled to each other, it is possible to avoid complication of the casing configuration.
(3) In the first casing, the water supply channel and the hot water channel are formed to be substantially coaxially opposed to each other, and in the second casing, the hot water supply channel is substantially orthogonal to an axis formed by the water supply channel and the hot water channel. The bypass passage is bent at a substantially right angle, the upstream portion is formed substantially orthogonal to the axis of the water supply passage and substantially parallel to the axis of the tap water passage, and the downstream portion is formed of an axis of the water supply passage. It is good to form so that it may be substantially parallel and may be substantially orthogonal to the axis line of the said hot water outlet.

  If it is the above structures, a water supply path and a hot water supply path can be connected by the bypass path of a short diameter path. Therefore, it contributes to increasing the mixing response of hot water, and the entire mixing valve unit can be made compact.

<Example>
Next, an embodiment embodying the mixing valve unit of the present invention will be described with reference to the drawings.
The mixing valve unit U of the present embodiment includes first and second casings 1 and 2 each formed of a synthetic resin material. Inside the first casing 1, a water supply channel 3 through which low-temperature water passes and a hot water channel 4 through which high-temperature water passes are formed. As shown in FIGS. 1 to 5, the water supply channel 3 and the hot water channel 4 in the present embodiment face each other almost coaxially with a storage chamber 6 for storing the mixing valve body 5 of the mixing valve M interposed therebetween.

  One end side of the water supply pipe 7 constituting the water supply path 3 is connected to a water supply source (not shown), and the other end side communicates with the storage chamber 6. In the middle of the water supply pipe 7, a bypass passage introduction opening 9, which will be described later, opens in a circular shape on the lower surface in the drawing.

  The hot water pipe 10 constituting the hot water channel 4 is formed with substantially the same inner diameter as the water supply pipe 7. One end side of the hot water pipe 10 is connected to a hot water source (not shown) (for example, a hot water storage tank), and the other end side communicates with the storage chamber 6.

  The peripheral wall constituting the storage chamber 6 is provided with a water supply channel side opening 11 and a hot water channel side opening 12 for communicating the inside of the storage chamber 6 with the water supply channel 3 and the hot water channel 4 respectively. Both the water supply channel side opening 11 and the hot water channel side opening 12 are arranged almost coaxially with the water supply channel 3 and the hot water channel 4, that is, substantially coaxial with each other. It opens with almost the same diameter.

As shown in FIG. 2 and the like, the inner peripheral surface of the peripheral wall of the storage chamber 6 constitutes a part of the peripheral surface. As described above, the mixing valve body 5 is accommodated in the accommodating chamber 6 so as to be rotatable around the axis. The rotating shaft 5A of the mixing valve body 5 is connected to a valve motor 13 (stepping motor) that can rotate forward and reverse.
In the first casing 1, a mounting portion 14 protrudes from the upper surface of the portion constituting the storage chamber 6, and a valve motor 13 for driving the mixing valve body 5 is mounted. The mounting portion 14 has an inner / outer double cylinder structure arranged coaxially, and the central axis thereof is orthogonal to the axes of the water supply pipe 7 and the hot water pipe 10. Of these, both ends in the axial direction of the inner cylindrical portion are open.

  A rotating shaft 5A formed in the mixing valve body 5 passes through the inner cylinder portion in a rotatable manner. A seal ring 15 is fitted in two stages on the outer peripheral surface of the rotating shaft 5A, and the mixing valve body 5 can rotate in a sealed state. The rotating shaft 5 </ b> A is formed so as to project from the center of the ceiling wall of the mixing valve body 5, and the projecting end is connected to a drive unit (not shown) of the valve motor 13. The valve motor 13 is connected to a control device (not shown), and the rotation direction and the rotation angle of the mixing valve body 5 are controlled by a control signal from the control device.

2 to 4 show typical positions as the rotational position of the mixing valve body 5. Actually, the mixing valve body 5 can be held at any position between the position shown in FIG. 2 and the position shown in FIG. 2 shows the hot water side fully open position where the inlet 16 faces only the hot water channel 4 side, and FIG. 3 shows the hot water where the inlet 16 faces half of the hot water channel 4 and the water supply channel 3 respectively. 4 is a half-open position, and FIG. 4 is a water-side full-open position where the inlet 16 faces only the water supply channel 3 side.
The main body portion 5B of the mixing valve body 5 is formed in a substantially cylindrical shape including a ceiling wall and a side wall, and is accommodated in close contact with the peripheral wall of the accommodation chamber 6. The axis of the main body 5B of the mixing valve body 5 is orthogonal to the axes of the water supply channel 3 and the hot water channel 4, and the axes of each other intersect each other.
In the side wall of the main body portion 5 </ b> B in the mixing valve body 5, the above-described inlet 16 for introducing high temperature water or low temperature water into the mixing valve body 5 is opened. As shown in FIGS. 2 to 4, the inflow port 16 is formed over an angular range corresponding to a substantially half circumference of the side wall of the main body 5 </ b> B. Further, the main body portion 5B of the mixing valve body 5 is opened downward in the figure, and communicates with the hot water outlet 18 through the outlet 17 that opens at the end of the second casing 2.

  The first casing 1 is formed with first and second connecting portions 19 and 20 projecting so as to surround portions where the introduction opening 9 and the opening of the main body portion 5B of the mixing valve body 5 face each other. Both connecting portions 19 and 20 are arranged adjacent to each other on substantially the same height surface in the first casing 1 with no height difference. These are both formed into a short cylindrical shape having the same depth, and a part of the circumferential surface is connected to each other. The second casing 2 can be assembled via both connecting portions 19 and 20.

  The second casing 2 is formed with a tapping pipe 21 having a tapping path 18 inside. The outlet pipe 21 is assembled to the first casing 1 so as to be substantially coaxial with the rotating shaft 5A of the mixing valve body 5. One end of the hot water discharge pipe 21 is connected to the second connecting portion 20 in a sealed state via an O-ring 44. An outlet 17 that communicates with the inside of the mixing valve body 5 is opened at one end of the hot water discharge pipe 21, and a pipe that communicates with the bathtub 45 or the like can be connected to the other end.

  Further, a bypass passage 8 for bypassing the water supply passage 3 and the hot water supply passage 18 is provided inside the second casing 2. The water supply connection pipe 22 constituting the upstream portion of the bypass path 8 is assembled to the first casing 1 so as to be substantially orthogonal to the axis of the water supply path 3 and substantially parallel to the axis of the tap water pipe 21. One end of the water supply connecting pipe 22 is connected to the first connecting portion 19 in a sealed state via an O-ring 23.

  The other end portion of the water supply connection pipe 22 is integrally connected to a joint portion 24 that constitutes an intermediate portion of the bypass path 8. A cylindrical tube wall 25 is provided in the joint portion 24 in the illustrated lateral direction. That is, the axis of the cylinder wall 25 is set to be substantially orthogonal to the axis of the water supply connecting pipe 22, and a valve seat 26 is formed at the tip of the cylinder wall 25. In the joint portion 24, an annular space 27 is formed around the cylindrical wall 25 and communicates with the upstream portion of the bypass path 8. The cylindrical wall 25 is open at both ends in the axial direction, and the inside forms an intermediate portion of the bypass path 8.

  From the side surface of the joint portion 24, a hot water connection pipe 28 constituting a downstream portion of the bypass path 8 is integrally formed and connected to the hot water pipe 18 in the middle of the hot water pipe 21. The hot water connection pipe 28 is substantially coaxial with the cylindrical wall 25 and is formed with substantially the same hole diameter.

  In the joint portion 24, an annular protrusion 29 is formed in a ring shape at the end opposite to the hot water connection pipe 28. Here, a mechanism in the pilot type electromagnetic valve EV used in the present embodiment is provided. Part EM is attached. The mechanism part EM includes a yoke 30, a coil 32 wound around the bobbin 31, a plunger 33 that can move along the central axis of the bobbin 31, and the like. A pilot valve 36 that opens and closes a pilot hole 35 of the diaphragm valve 34 is attached to the shaft end of the plunger 33. The flow direction of the current supplied to the coil is a direction in which the plunger 33 is moved to the diaphragm valve 34 side. That is, the pilot valve 36 closes the pilot hole 35 when the coil is energized.

  The diaphragm valve 34 includes a diaphragm 37 and a hard resin disk member 38. The diaphragm 37 is integrally formed of a soft resin, and a bending allowance portion 37A is formed on the peripheral edge portion. The disk member 38 and the diaphragm 37 are assembled by allowing the disk member 38 to pass through two locations near the central portion and the peripheral portion of the diaphragm 37 in a retaining state.

  A shaft portion 38A extends in the center of the disk member 38 along the axial direction, and a shaft hole 39 passes through the center shaft. One end side of the shaft hole 39 opens to the inside of the cylindrical wall 25, and the other end side is narrowed to a diameter smaller than that of the shaft hole 39 to form the pilot hole 35 described above. The pilot hole 35 communicates with a back pressure chamber 40 that is defined on one side of the diaphragm 37 (side facing the mechanism). Further, a small hole 41 passes through the peripheral edge of the disk member 38 along the thickness direction. The small hole 41 communicates the upstream portion of the bypass passage 8 and the back pressure chamber 40.

  The diaphragm 37 is attached to the disk member 38 so as to be exposed on the side facing the cylinder wall 25. In this embodiment, the diaphragm 37 is seated when the coil 32 is energized to hold the electromagnetic valve EV in a closed state.

  In the cylindrical wall 25, a main spring 42 that urges the diaphragm valve 34 in the opening direction is interposed between the root portion of the cylindrical wall 25 and the shaft portion of the disk member 38. In addition, a subspring 43 is interposed between the disc member 38 and the pilot valve 36 to urge the pilot valve 36 in the direction of opening the pilot hole 35.

  Next, the function and effect of the present embodiment configured as described above will be described. For example, when a curan (not shown) is operated to supply hot water to a bathtub, the solenoid valve EV is energized to the coil. Then, since the plunger 33 is displaced in a direction approaching the diaphragm 37, the pilot hole 35 is closed by the pilot valve 36. Along with this, the pressure in the back pressure chamber 40 is increased, and as a result, the diaphragm valve 34 is pushed against the spring force of the main spring 42, so that the valve seat 26 is seated and the electromagnetic valve EV is closed. The bypass path 8 is held in a closed state. On the other hand, in the mixing valve M, the drive of the valve motor 13 is controlled based on a command from the control device, and the rotational position of the mixing valve body 5 is adjusted. That is, in the mixing valve M, as shown in FIGS. 2 to 4, the size of the angle range in which the inlet 16 of the mixing valve body 5 communicates with the warm water channel 4 or the water supply channel 3 is instructed. Based on this, the mixing ratio of hot water and water is adjusted. Thus, the hot water mixed at a predetermined ratio inside the mixing valve body 5 flows down the hot water supply path 18 through the outlet and is supplied to the bathtub.

  By the way, in the present embodiment, the energized closed type solenoid valve EV is used in the middle of the bypass path 8, but the energized open type solenoid valve is used in the middle of the water supply path without the bypass path 8. Is assumed. And the case where a power failure occurs in the middle of supplying hot water through the mixing valve M is further assumed. In that case, since the electromagnetic valve is closed, water is not mixed, and hot water is supplied in a situation unexpected by the user.

  However, in this embodiment, when a power failure occurs while hot water is being supplied, the solenoid valve EV is opened and the supply of low-temperature water is continued. That is, when energization to the coil is stopped, the pilot valve 36 is lifted by the spring force of the subspring 43 and the pilot hole 35 is opened. As a result, the hot water in the back pressure chamber 40 flows to the secondary side (inside the cylindrical wall 25, the downstream side of the bypass path 8) through the pilot hole 35 and the shaft hole 39, so that the pressure in the back pressure chamber 40 decreases. . Thereby, since the spring force of the main spring 42 is won, the diaphragm valve 34 is separated from the valve seat 26 and the electromagnetic valve EV is opened.

  As described above, the hot water in the water supply passage 3 passes through the bypass passage 8 through the introduction opening 9, flows into the hot water discharge pipe 21, and hot water is mixed inside the hot water discharge pipe 21. Thus, even if a power failure occurs during the use of high-temperature water, the bypass path 8 is opened, so that hot water can be mixed through the bypass path 8. Therefore, high temperature hot water does not occur in a situation not intended by the user. At this time, the bypass path 8 and the hot water path 18 are not connected via a pipe as in the conventional case, but in the present invention, the entire mixing valve unit U is integrated so that the bypass path 8 and the hot water path 18 are connected. Since it is directly connected without going through the piping, it is possible to mix water in a short time with high response to high temperature water. There are also the following effects. In the present embodiment, hot water can be mixed in the middle of the hot water outlet 18, but in the conventional case, the hot water mixing part is performed at the end of the pipe connected to the hot water outlet 18 as shown in FIG. 6. . It is desirable that the hot water and water are well stirred in the mixed hot water used, but in the conventional case, the hot water mixing position must be close to the use position, and the path required for the stirring accordingly. Must be shortened. On the other hand, in the present embodiment, the hot water mixing position is far from the use position, and the path required for stirring can be made longer accordingly. As a result, in the present embodiment, the hot water is stirred well, which can contribute to reducing the temperature unevenness of the mixed hot water used as much as possible.

  Further, as a type of the electromagnetic valve EV, in this embodiment, a pilot type is adopted instead of a so-called direct acting type. As is well known, the direct acting type generally has a large pressure loss, whereas the pilot type can operate the diaphragm valve 34 with a weak force. That is, since the pilot type solenoid valve EV has a low pressure loss, this is also advantageous in effectively realizing the mixing of the low temperature water with the high temperature water.

  Further, in this embodiment, when the mixing valve is unitized, the casing is divided into first and second members and assembled together. For this reason, compared with the case where a casing is formed with a single member, the structure of the 1st and 2nd casing can be simplified, and the mold structure can also be simplified correspondingly.

  Furthermore, in contrast to the first casing 1 in which the water supply passage 3 and the hot water passage 4 are concentrically opposed to each other, the second casing 2 forms a hot water discharge passage 18 so as to be substantially orthogonal to the axis of the first casing 1, and is bypassed. The path 8 is formed by cranking. For this reason, the bypass path 8 can be formed as short as possible. Accordingly, the mixing valve unit U as a whole can be made compact while contributing to increasing the mixing response of the hot water.

<Other embodiments>
The present invention is not limited to the embodiments described with reference to the above description and drawings. For example, the following embodiments are also included in the technical scope of the present invention.
(1) In the above embodiment, the water supply channel 3 and the hot water channel 4 are arranged so as to be concentrically opposed in the same plane with the mixing valve M interposed therebetween, but they are not necessarily concentrically opposed in the same plane. Also good.
(2) In the said Example, although the mixing valve unit U showed the form comprised combining two casings, you may make it comprise three or more casings.

DESCRIPTION OF SYMBOLS 1 ... 1st casing 2 ... 2nd casing 3 ... Water supply path 4 ... Warm water path 8 ... Bypass path 34 ... Diaphragm valve 35 ... Pilot hole 36 ... Pilot valve EV ... Electromagnetic valve (electromagnetic on-off valve)
M ... Mixing valve U ... Mixing valve unit

Claims (4)

A water supply channel through which low-temperature water passes;
A hot water channel through which hot water passes,
A mixing valve for mixing the low-temperature water and the high-temperature water;
A hot water passage through which the mixed hot water adjusted by the mixing valve passes,
A bypass path with one end side communicating with the water supply path and the other end side communicating with the tap water path;
An electromagnetic on-off valve that closes the bypass when energized and opens when de-energized;
And a mixing valve unit.   The mixing valve unit according to claim 1, wherein the electromagnetic on-off valve is a pilot-type electromagnetic on-off valve. A first casing in which a housing chamber for housing the water supply channel, the hot water channel, and a mixing valve body of the mixing valve is formed;
A valve seat that houses the bypass passage, the hot water passage, and the electromagnetic on-off valve and that is opened and closed by the electromagnetic on-off valve is formed, and includes a second casing that can be assembled to the first casing. The mixing valve unit according to claim 1 or 2. In the first casing, the water supply channel and the hot water channel are formed substantially concentrically and opposed to each other,
In the second casing, the hot water supply passage is formed so as to be substantially orthogonal to an axis formed by the water supply passage and the hot water passage, the bypass passage is bent at a substantially right angle, and an upstream portion is substantially orthogonal to the axis of the water supply passage. And the downstream portion is formed substantially parallel to the axis of the water supply passage and substantially orthogonal to the axis of the discharge passage. 3. The mixing valve unit according to 3.

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