JP4873055B2 - Mixing valve - Google Patents

Description

  The present invention relates to a mixing valve and a water heater using the mixing valve.For example, in a water heater having a hot water storage tank and supplying hot water that has been boiled up to a bathtub or a general faucet, it is set from the outside by a remote controller or the like. The present invention also relates to a hot water mixing valve for stably supplying hot water having a desired temperature.

  15 to 17 are views showing a conventional hot and cold water mixing valve disclosed in Japanese Utility Model Laid-Open No. 62-119586. In FIG. 15, 1 is a valve box, 2, 3 is an inlet port, and 4 is an outlet port. The valve chamber 1a between the inlet ports 2 and 3 of the valve box 1 is formed in a cylindrical shape, and the cylindrical valve body 5 having an outer shape that matches the inner diameter of the valve chamber 1a rotates in a watertight manner. Arranged to be possible. A drive shaft 7 of a stepping motor 6 provided on the upper end surface of the valve box 1 is fixed to the center of one end portion 5a of the valve body 5, and the other end portion 5b is opened to communicate with the outlet port 4. . Further, as shown in FIG. 16, openings 5 c and 5 d are formed at two locations on the peripheral surface of the valve body 5, one opening 5 c communicates with the inlet port 2, and the other opening 5 d It communicates with the inlet port 3.

  When the valve body 5 is rotated by the stepping motor 6, the opening area of the inlet ports 2 and 3 changes, so that water flowing into the valve chamber 1a from the inlet ports 2 and 3 through the openings 5c and 5d and The hot water flow rate changes. As shown in the flow rate characteristic diagram of FIG. 17, the flow rate of water and hot water changes as the rotation angle θ of the valve body 5 is changed by the stepping motor 6. Works to decrease. Further, when the stepping motor 6 is rotated in the reverse direction, the water flow rate is decreased and the hot water flow rate is increased. The hysteresis appears in the flow characteristics due to the backlash of the reduction gear of the stepping motor.

Japanese Utility Model Sho 62-119586

  The conventional hot and cold water mixing valve is configured as described above, and as shown in FIG. 17, it can be seen that the linearity with respect to the valve body rotation angle θ is not particularly good in the flow rate characteristic on the hot water side. For example, since the inlet ports 2 and 3 of hot water and water are arranged so as to face each other from the front, when the inlet port 2 starts to open and the opening area of the inlet port 3 is reduced, the inlet port 3 A large pressure loss occurs due to a frontal collision between the water flow flowing into the opening 5c of the valve body 5 from 2 and the flow of hot water flowing into the opening 5d of the valve body 5 from the inlet port 3, and the dynamic pressure due to the water flow is inflow of hot water. This is considered to be caused by a marked increase in the decreasing gradient of the hot water flow rate with respect to the rotation angle of the valve body 5. If the dynamic pressure of the hot water is greater, the water side linearity will be worse.

  Further, as shown in FIG. 17, the flow rate rises slowly when the flow passage cross-sectional area is small on the hot water side and the water side. For this reason, for example, after the hot water side is first fully opened from the initial state, When trying to obtain hot water with a predetermined temperature by gradually increasing the cross-sectional area, the rise of the flow rate on the water side is slow, so that the rise time of the temperature control is slow and the response is poor. Moreover, there was a similar problem when the water side was fully opened first.

In the conventional hot and cold water mixing valve, the shapes of the openings 5c and 5d of the valve body 5 are both circular, and the cross-sectional area of one flow path is reduced by the rotation of the valve body, and the cross-sectional area of the other flow path is reduced. Is increased, the cross-sectional area ratio R (R = S / S ₀ , S: channel cross-sectional area at the rotation angle θ, S ₀ : inlet cross-sectional area of the inlet port). ) With respect to the rotation angle θ of the valve body (ΔR / Δθ) is greatly different between the water side and the hot water side with respect to the rotation angle θ, and the flow rate distribution ratio changes rapidly with respect to the rotation angle. There was a problem that the linearity of control deteriorated.

  In addition, the pressure loss coefficient is large in the region where the cross-sectional area ratio R of the flow path is small. Further, as the operation of the mixing valve, when the cross-sectional area of one flow path is decreased by the rotation of the valve body, the cross-sectional area of the other flow path is increased. For this reason, the flow rate of water (or hot water) flowing in from the flow path having the smaller cross-sectional area becomes significant due to the interaction with the influence of the dynamic pressure of the fluid on the other side. For this reason, in the region where the channel cross-sectional area is small, there is a valve body angle range in which water (or hot water) does not flow through this channel even though the channel exists. There is a problem that the effective valve body rotation angle range that functions as a hot and cold mixing valve is narrowed, and the accuracy of temperature control deteriorates.

Thus, in the conventional hot and cold water mixing valve, the linearity of the mixing flow rate of hot water with respect to the rotation angle of the valve body 5 is poor, and therefore linearity is not obtained in the temperature control of the mixed water with respect to the rotation angle of the valve body 5. There was a problem of poor temperature controllability. In addition, there is a problem that the rise time of the temperature control is slow and the responsiveness is poor.
Also, due to this, when the above mixing valve is used in a water heater or the like, it takes a long time to obtain mixed water having a desired temperature set from the outside by a remote controller or the like, or the mixed water discharged There was a problem that the temperature of hunting was not stable due to hunting.

  The present invention has been made to solve the above-described problems, and shows a smooth change in the characteristics of the mixed liquid with respect to the rotation angle of the valve body, and has a good controllability and a good responsiveness. The purpose is to provide.

  Furthermore, it aims at providing the water heater from which the smooth temperature change is stably obtained with respect to the rotation angle of a valve body.

The mixing valve of the present invention includes a valve box having a first fluid inlet, a second fluid inlet, and a discharge port for discharging a fluid mixture of the first fluid and the second fluid, A valve body that is rotatably installed in the valve box and has a plurality of openings provided in accordance with the positions of the introduction ports and the discharge ports, and a valve body drive body that rotationally drives the valve body. In the mixing valve, the inlet of the first fluid and the inlet of the second fluid are arranged so as to be shifted with respect to the flowing direction of the mixed fluid, and the valve body is adapted to the position of each inlet. (1) When one opening is in a fully open position, the other opening is in a position that is not fully closed or fully open. (2) One opening is fully closed. In the position where the other opening is not fully open, and (3) valve body (3-1) In the range from the position where one opening is fully open to the position where the other opening is fully open, the opening area monotonously decreases from the position where one opening is fully open. Then, the first range in which the opening area of the other opening monotonously increases, and (3-2) outside the first range, when the opening area monotonously decreases from the position where one opening is fully open, the other The opening area of the first opening also monotonously decreases and the second range is fully closed, and (3-3) the first range and the second range are opened from the position where the other opening is fully open. When the area decreases monotonously, the opening area of one of the openings also decreases monotonously and has a third range that is fully closed .

  Moreover, the water heater of this invention uses the mixing valve of the said structure for the mixing valve which mixes hot water and water.

As described above, according to the mixing valve of the present invention, the first fluid introduction port, the second fluid introduction port, and the discharge port for discharging the mixed fluid of the first fluid and the second fluid. A valve body having a plurality of openings provided in rotation according to the positions of the inlets and the discharge ports, and the valve body. In the mixing valve including the valve body driving body, the first fluid introduction port and the second fluid introduction port are arranged to be shifted with respect to the flowing direction of the mixed fluid. The opening provided in each of the valve bodies in accordance with the position is (1) When one opening is in a position where it is fully open, the other opening is in a position where it is not fully closed and fully open, (2) When one opening is in a fully closed position, the other opening is not fully open And (3) in the rotational position of the valve body, (3-1) in the range from the position where one opening is fully open to the position where the other opening is fully open, one opening is fully open. A first range in which the opening area of the other opening monotonously increases when the opening area monotonously decreases from the position, and (3-2) a position where one opening is fully open outside the first range. When the opening area decreases monotonically, the opening area of the other opening also decreases monotonously and becomes fully closed, and (3-3) outside the first range and the second range, When the opening area monotonously decreases from the position where the opening is fully open, the opening area of one opening also monotonously decreases and has a third range in which the opening is fully closed, so that by the dynamic pressure of the fluid flowing out from the inlet The degree to which one flow directly interferes with the other flow is reduced. With respect to the rotation angle, excellent linearity of the mixed flow rate changes of the two fluids, the characteristic change of smooth mixture with respect to the rotation angle of the valve body is obtained, it is possible to provide a control with good mixing valve. Also, it is possible to enlarge the effective valve body rotating angle range of the control, it is possible to control with high accuracy.

It is a section lineblock diagram showing a schematic structure of a hot and cold water mixing valve by Embodiment 1 of the present invention. It is sectional drawing which shows the valve body rotation operation | movement of the hot and cold water mixing valve by Embodiment 1 of this invention. It is a figure which shows the flow volume characteristic of the hot and cold water mixing valve by Embodiment 1 of this invention. It is a figure which shows the relationship between the cross-sectional area ratio of the flow path in the hot water mixing valve by Embodiment 1 of this invention, and a valve body rotation angle. It is a figure which shows the relationship between the valve body rotation angle and mixed water temperature in the hot and cold water mixing valve by Embodiment 1 and Embodiment 2 of this invention. It is a cross-sectional block diagram which shows schematic structure of the hot-water / water mixing valve by Embodiment 2 of this invention. It is a figure which shows the flow volume characteristic of the hot and cold water mixing valve by Embodiment 2 of this invention. It is a figure which shows the relationship between the valve body rotation angle and the change rate of cross-sectional area ratio in the hot / cold water mixing valve by Embodiment 2 of this invention. It is a cross-sectional block diagram which shows schematic structure of the hot-water / water mixing valve by Embodiment 3 of this invention. It is sectional drawing which shows the valve body rotation operation | movement of the hot and cold water mixing valve by Embodiment 3 of this invention. It is a figure which shows the flow volume characteristic of the hot and cold water mixing valve by Embodiment 3 of this invention. It is a figure which shows the relationship between the valve body rotation angle and mixed water temperature in the hot / cold water mixing valve by Embodiment 3 of this invention. It is a cross-sectional block diagram which shows schematic structure of the hot-water / water mixing valve by Embodiment 5 of this invention. It is a flowchart figure which shows operation | movement of the hot and cold water mixing valve concerning Embodiment 5 of this invention. It is a cross-sectional block diagram which shows the structure of the conventional hot water mixing valve. It is sectional drawing which shows the structure of the valve body in the conventional hot water mixing valve. It is a figure which shows the flow volume characteristic of the conventional hot water mixing valve.

Embodiment 1 FIG.
Embodiment 1 of the present invention will be described below with reference to the drawings.
FIG. 1A is a cross-sectional configuration diagram showing a schematic configuration of a hot and cold mixing valve according to Embodiment 1 of the present invention, and FIG. 1B is a cross-sectional view taken along line BB in FIG. In FIG. 1, 11 is a valve box, 12 is a water inlet, 13 is a hot water inlet, and the inlets 12 and 13 are arranged to be shifted with respect to the flowing direction of hot water so that the inlets do not face each other. Has been. Reference numeral 14 denotes a discharge port for hot water introduced from the water introduction port 12 and the hot water introduction port 13. The valve chamber 11a between the inlets 12 and 13 of the valve box 11 is formed in a cylindrical shape. The cylindrical shape of the valve chamber 11a has an outer diameter that matches the inner diameter or is slightly smaller than the inner diameter. The valve body 15 is rotatably arranged. A drive shaft 17 connected to a stepping motor (not shown) mounted on the upper portion of the valve box 11 is provided at one end portion 15 a of the valve body 15, the central axis of which is the central axis of the cylindrical portion of the valve body 15. It is formed to match. Further, the other end 15 b of the valve body 15 is open and communicates with the hot water discharge port 14. Reference numeral 18 denotes a screw hole for fixing the stepping motor to the valve box. The valve body 15 is fixed in the valve chamber 11a of the valve box 11 by a valve body presser 19 so that a vertical displacement does not occur. Further, the sliding surfaces of both end portions 15a and 15b of the valve body 15 are formed of a material having a low frictional resistance, such as a tetrafluoroethylene resin, as a member for relaxing resistance during rotation of the valve body 15. Washers 20 and 21 are arranged. Reference numeral 22 denotes an O-ring for maintaining watertightness between the valve body drive shaft 17 and the valve body presser 19 and corresponds to the rotating portion of the valve body drive shaft 17. Therefore, in this embodiment, as shown in FIG. It is arranged. Reference numeral 23 denotes an O-ring for maintaining watertightness between the valve box 11 and the valve body presser 19, and reference numeral 24 denotes an O-ring for maintaining watertightness between the valve chamber 11a and the valve body 15. 100 is a mixing valve.

As shown in FIGS. 1A and 1B, openings 15 c and 15 d are formed at two locations on the peripheral surface of the valve body 15, and the opening 15 c formed on the one end 15 a side of the valve body 15. Is connected to the water inlet 12, and an opening 15 d formed on the other end 15 b side of the valve body 15 is in communication with the hot water inlet 13. The water inlet 12 is more like a stepping motor than the hot water inlet 13. It is arranged at a close position. An O-ring 24 is disposed on the other end 15b side of the valve body 15, that is, on the peripheral surface of the valve body 15 close to the hot water discharge port 14, and hot water from the gap between the valve chamber 11a and the valve body 15 to the hot water discharge port 14 is disposed. This prevents the leakage of the rotation center axis of the valve body 15 and prevents the valve body 15 from shaking.
In the first embodiment, the openings 15c and 15d provided in the valve body 15 each have a fan shape in which a semicircle and a triangle are combined. Regarding the water side opening 15c, all of the water side flow path formed by the water inlet 12 and the valve body opening 15c and the hot water side flow path formed by the hot water inlet 13 and the valve body opening 15d are all present. With the closed state as the initial state, the triangular portion is formed such that the apex of the triangle is positioned in the direction in which the valve body rotation angle increases (indicated by the arrow in the figure) from this state. Conversely, with respect to the hot water side opening 15d, a semicircular portion is formed in the direction in which the valve body rotation angle increases from the initial state. That is, when the flow path area formed by the water (hot water) inlet and the valve body opening is small, the flow path is formed by the semicircular portion of the valve body opening.

Next, the rotation operation of the valve body 15 will be described in detail with reference to a cross-sectional view (FIG. 2) viewed from the line AA in FIG. In the figure, 15c1 is a triangular portion of the opening 15c, 15c2 is a semicircular portion of the opening 15c, 15d1 is a triangular portion of the opening 15d, and 15d2 is a semicircular portion of the opening 15d.
FIG. 2A shows a state in which the valve body is in the initial state. In this case, as described above, the openings 15c and 15d provided in the valve body 15 are not in communication with the hot water inlets 12 and 13 and are fully closed. FIG. 2B is a diagram showing a state in which the valve body 15 is rotated in the direction of the arrow from the initial state to fully open the water-side flow path. At this time, with respect to the hot water side flow path, the opening 15d of the valve body 15 and the hot water inlet 13 of the valve box are not in communication and are still in a fully closed state. FIG. 2C shows a state in which the rotation angle is further increased and the hot water side flow path is opened, and the open area ratios of the hot water side and the water side flow path are equalized. In FIG.2 (d), a hot water side flow path will be fully open, and a water side flow path will be in a fully closed state.
In the hot / cold water mixing valve 100 shown in the first embodiment, the hot / cold water mixing operation is performed in the above valve body rotation angle range. That is, the rotation direction of the valve body 15 from the initial state is such that, after the opening ratio of the water-side inlet 12 is increased from the initial state to the fully open state, the opening ratio of the hot water-side inlet 13 is increased. The direction is to increase.

  When the valve body 15 is rotated by the stepping motor from the reference position in the initial state, the water inlet 12, the hot water inlet 13, and the valve are within the valve body rotation angle range shown in FIGS. The area of the flow path formed between the body openings 15c and 15d varies depending on the rotation angle of the valve body, and passes through the valve body openings 15c and 15d from the water inlet 12 and the hot water inlet 13 in the valve chamber 11a. The flow rate of water and hot water flowing into the water changes. As can be seen from FIG. 2, in this embodiment, the water side channel is first opened and water is flown, and then the hot water side channel is gradually opened to change the hot water mixture ratio to the desired temperature. The valve is operated to raise the temperature. As a result, hot water is not discharged immediately after opening the faucet or shower, and accidents such as burns can be avoided.

  Moreover, in this Embodiment, the water inlet 12 and the hot water inlet 13 are arrange | positioned at fixed intervals with respect to the flow direction of mixed water so that a mutual inlet may not oppose. Therefore, the dynamic pressure of the fluid from the water inlet 12 and the hot water inlet 13 does not cause one flow to directly interfere with the other flow, and thereby the hot water / water mixing ratio with respect to the rotational angle of the valve body with respect to the rotational angle. Excellent linearity, enabling smooth mixing temperature change with respect to the rotation angle of the valve body.

  Further, as described above, there is a valve body angle range in which the pressure loss is large and water (or hot water) does not flow in the region where the cross-sectional area ratio R of the flow path is small. Since the introduction port 12 and the hot water introduction port 13 are arranged at a certain interval with respect to the flowing direction of the mixed water so that the introduction ports do not face each other, the water introduction located upstream is provided. When the cross-sectional area ratio of the mouth 12 is large and the flow-path cross-sectional area ratio of the hot water inlet 13 located on the downstream side is small, that is, when the rotation angle is small, hot water is sucked in from the upstream. Conversely, a phenomenon occurs in which hot water having a flow rate larger than the original flow rate flows from the hot water inlet 13. As a result, the effect that the rise time of the temperature control is accelerated can be obtained.

FIG. 3 shows an example of the valve body rotation angle dependence of the flow rate of hot water flowing into the valve chamber 11a when the valve body rotation angle when the water side inlet 12 is fully open is 0 degree. is there. In FIG. 3, the solid line is the flow rate characteristic of the first embodiment, and the broken line (comparative example) is that the positions of the inlets 12 and 13 are the same as those of the first embodiment, and the positions of the inlets 12 and 13 are the same. In addition, the flow characteristics obtained when the shapes of the openings 15c and 15d formed in the valve body 15 are the same circle as the cross-sectional shapes of the water inlet 12 and the hot water inlet 13, respectively. In the hot and cold water mixing valve 100 having the valve body openings 15c and 15d according to the first embodiment, the shapes of the openings 15c and 15d are as shown in FIG. When the valve cross-sectional area is smaller than the opening cross-sectional area of the introduction port, and the valve body is rotated in the direction of mixing water and hot water from the position where one of the flow paths is fully open, the valve Since the apex of the triangular part is arranged in the body rotation direction, the valve body rotation angle region in the vicinity where the flow rate introduced from each flow path of hot water and water takes the maximum value (when fully open) Is smaller than that of the comparative example having the same valve body opening shape as that of the hot water inlet (FIG. 3), and its cross-sectional area ratio R is also small (FIG. 4). For the fluid, the flow distribution ratio is substantially reduced compared to the comparative example. Result, the effect of the rise time is faster the temperature control of the relative change in the rotation angle.
FIG. 5 is a test result showing the relationship between the valve body rotation angle and the mixed water temperature in the first embodiment and the comparative example. At this time, the temperatures of hot water and water introduced into the mixing valve are 90 ° C. and 20 ° C., respectively. In the hot and cold water mixing valve having the shape of the valve body opening according to the first embodiment, a hot water supply temperature range of 30 to 60 ° C. that is generally required can be controlled at a valve body rotation angle of 7 to 72 degrees, It can be seen that the rise time of the temperature control is faster than that in the case of the hot and cold water mixing valve of the comparative example (valve body rotation angle 12 to 69 degrees), and the valve body rotation angle range effective for temperature control can be expanded. Therefore, in the case of the first embodiment, since the rise of the temperature change is fast, it is possible to perform the temperature control with good responsiveness and high accuracy.

In the above embodiment, each of the openings 15c and 15d has a fan shape in which a semicircle and a triangle are combined, but may have a shape in which a substantially triangle and a substantially semicircle are combined.
The opening 15c, 15d form of, without a fan shape, or may be shaped to have an opening cross-sectional area S ₀ is smaller than the opening cross-sectional area of the inlet.

Embodiment 2. FIG.
6A is a cross-sectional configuration diagram showing a schematic configuration of a hot and cold mixing valve according to Embodiment 2 of the present invention, and FIG. 6B is a cross-sectional view taken along line BB in FIG. 6A. In FIG. 6, the same or equivalent members as those in the hot and cold water mixing valve according to Embodiment 1 are given the same reference numerals as those in FIG.

  As shown in FIGS. 6A and 6B, openings 15 c and 15 d are formed at two locations on the peripheral surface of the valve body 15, and the opening 15 c formed on the one end 15 a side of the valve body 15. Is connected to the water inlet 12, and an opening 15 d formed on the other end 15 b side of the valve body 15 is in communication with the hot water inlet 13. The water inlet 12 is more like a stepping motor than the hot water inlet 13. It is arranged at a close position. The member configuration is exactly the same as that of the mixing valve 100 shown in the first embodiment. In the second embodiment, the openings 15c and 15d provided in the valve body 15 each have a shape similar to a home base in which a rectangle and a triangle are combined. Regarding the water side opening 15c, the water side flow path formed by the water inlet 12 and the valve body opening 15c and the hot water side flow path formed by the hot water inlet 13 and the valve body opening 15d are both fully closed. In this state, the triangular portion is formed such that the apex of the triangle is located in the direction in which the valve body rotation angle increases (clockwise in the configuration shown in FIG. 6). Conversely, with respect to the hot water side opening 15d, one side of the rectangular portion is formed in the direction in which the valve body rotation angle increases from the initial state. That is, when the flow path area formed by the water (hot water) inlet and the valve body opening is small, the flow path is formed by the rectangular portion of the valve body opening. In addition, about the rotation direction of the valve body 15 at the time of starting, like the above-mentioned Embodiment 1, after the opening rate of the water side inlet 12 first increases from the initial state and becomes a full open state, The direction is such that the aperture ratio of 13 increases. The details of the rotation operation of the valve body are exactly the same as the hot water / water mixing valve shown in the first embodiment.

  When the valve body 15 is rotated by the stepping motor from the reference position that is the initial state, within the range of the valve body rotation angle shown in FIGS. 2A to 2D (however, in the case of the second embodiment, 15c2 Is a rectangular portion of the opening 15c, and 15d2 is a rectangular portion of the opening 15d.), The flow path area formed between the water inlet 12 and the hot water inlet 13 and the valve body openings 15c, 15d is a valve. The amount of water and hot water flowing into the valve chamber 11a from the water inlet 12 and the hot water inlet 13 through the valve body openings 15c and 15d changes depending on the rotation angle of the body. Also in the present embodiment, after the water side channel is first opened and water flows, the valve that gradually opens the hot water side channel and raises the mixed water temperature to the desired temperature while changing the hot water mixing ratio. It is a body movement.

FIG. 7 shows the valve body rotation of the flow rate of hot water flowing into the valve chamber 11a when the rotation angle of the valve body when the water side inlet is fully open is 0 degree in the hot water / water mixing valve configured as described above. It represents an example of angle dependency. In addition, the broken line (comparative example) of FIG. 7 is the same as the characteristic shown in Embodiment 1, and the shape of the opening part formed in the valve body is the same as the cross-sectional shape of the water inlet 12 and the hot water inlet 13, respectively. This is a flow rate characteristic obtained when the shape is circular. As shown in FIG. 7, in the hot and cold water mixing valve 100 having the valve body openings 15c and 15d according to the second embodiment, compared with the comparative example having the same circular valve body opening shape as the hot water inlet, The flow rate in the valve body rotation angle region in the vicinity where the flow rate introduced from each flow path of the water reaches the maximum value is suppressed, and in the valve body rotation angle region in which the flow rate of either hot water or water is reduced It can be seen that the linearity of the hot water flow rate is greatly improved.
That is, in the present embodiment, the valve body opening has a triangular portion and a rectangular portion, and as shown in FIG. 6, when the inlet is fully open, the flow passage cross-sectional area of the inlet is the opening of the inlet. Since the shape is smaller than the cross-sectional area, the flow rate in the valve body rotation angle region in the vicinity where the flow rate introduced from each flow path of hot water and water takes the maximum value is suppressed, and is the same as in the first embodiment. In addition, there is an effect that the rise time of the temperature control with respect to the change of the rotation angle becomes faster.
Further, in the hot and cold water mixing valve according to the second embodiment, as shown in FIG. 8, when the cross-sectional area of one flow path decreases and the cross-sectional area of the other flow path increases due to the rotation of the valve body, Valve body rotation angle of flow path cross-sectional area ratio R (R = S / S ₀ , S: flow cross-sectional area at rotation angle θ, S ₀ : open cross-sectional area of introduction port) with reference to the opening cross-sectional area of the mouth Since the rate of change with respect to θ (ΔR / Δθ) shows almost the same value on the water side and the hot water side with respect to the rotation angle θ, the ratio of the channel cross-sectional area of the water side and the hot water side changes smoothly. As a result, there is an effect that the linearity of the temperature control is excellent. In FIG. 8, the broken lines indicate the rate of change (ΔR / Δθ) of the cross-sectional area ratio R with respect to the valve body rotation angle θ in the comparative example in which the shapes of the openings 5c and 5d of the valve body 5 are both circular. However, it can be seen that the rate of change is greatly different for each rotation angle θ between the water side and the hot water side. Therefore, the flow rate distribution ratio changes rapidly with respect to the rotation angle, and the linearity of the temperature control is not good.
In FIG. 8, when the flow passage cross-sectional area on the hot water side is small (when the rotation angle θ is small), in the second embodiment, the rate of change of the cross-sectional area ratio R of the flow passage with respect to the valve body rotation angle θ ( ΔR / Δθ) is larger than that of the comparative example, and accordingly, the rise of the hot water flow rate is higher in the home base shape of the second embodiment than in the comparative example having a circular opening. Therefore, since the temperature of the mixed water rises at a small rotation angle, the rise time of the temperature control is fast, and the effect that the valve body rotation angle range effective for the temperature control can be expanded is also obtained.

  FIG. 5 shows test results showing the relationship between the valve body rotation angle and the mixed water temperature in the second embodiment and the comparative example. At this time, the temperatures of hot water and water introduced into the mixing valve are 80 ° C. and 20 ° C., respectively. Thus, in the hot and cold water mixing valve having the shape of the valve body opening according to the second embodiment, a generally required hot water supply temperature range of 30 to 60 ° C. is set at a valve body rotation angle of 5 to 72 degrees. It can be controlled, and is more effective for temperature control than the case of the hot water / water mixing valve of the comparative example (valve body rotation angle 12 ° to 69 °) and the case of the first embodiment (valve body rotation angle 7 ° to 72 °). It can be seen that the valve body rotation angle range can be expanded. Therefore, in the case of the second embodiment, it is possible to perform temperature control with good responsiveness and higher accuracy.

  In the second embodiment, each of the openings 15c and 15d has a shape in which a triangle and a rectangle are combined, but may have a shape in which a substantially triangle and a rectangle are combined.

Embodiment 3 FIG.
FIG. 9A is a cross-sectional configuration diagram showing a schematic configuration of a hot and cold mixing valve according to Embodiment 3 of the present invention, and FIG. 9B is a cross-sectional view taken along line BB of FIG. 9A. In FIG. 9, the same or equivalent members as those in the hot and cold water mixing valve according to the first embodiment are denoted by the same reference numerals as those in FIG.
In the third embodiment, in the hot and cold water mixing valve having the same configuration as that of the hot and cold water mixing valve shown in the second embodiment, as shown in FIG. 10, two openings provided on the peripheral surface of the valve body 15 15c and 15d are provided at positions where one of the flow paths formed by the hot water inlets 12 and 13 is in a fully open position, and the other flow path is not fully closed or fully open. .

  Next, the operation will be described. As shown in FIGS. 9 and 10, the hot water / water mixing valve in the third embodiment has a certain flow channel opening ratio for the hot water side flow channel in a state where the flow channel on the water inlet side is fully opened. It is not fully closed. Also in the present embodiment, a state where both the water side channel and the hot water side channel are fully closed is defined as an initial state. The rotation direction of the valve body at the start is after the opening rate of the water-side inlet 12 has increased from the initial state to the fully open state, as in the hot water / water mixing valve shown in the first and second embodiments. In such a direction, the opening ratio of the hot water inlet 13 increases. The direction of rotation from the initial state is indicated by an arrow in the figure.

The above-described rotating operation of the valve body will be described in detail with reference to a cross-sectional view (FIG. 10) viewed from the line AA in FIG.
FIG. 10A shows a state in which the valve body is in the initial state. In this case, neither of the openings 15c and 15d provided in the valve body 15 communicates with the hot water inlets 12 and 13 and is in a fully closed state. FIG. 10B is a view showing a state in which the valve body 15 is rotated in the direction of the arrow from the initial state to fully open the water-side flow path. At this time, in the hot and cold water mixing valve shown in the first and second embodiments, the hot water flow path is in a fully closed state, but in the third embodiment, the position of the hot water side opening 15d is shifted. Therefore, the hot water side flow path is already open. FIG. 10 (c) shows a state in which the rotation angle is further increased and the opening ratios of the hot water side and water side flow paths become equal. In FIG. 10 (d), the hot water side channel is fully opened, but the water side channel is not fully closed in this case as well, in the point different from the mixing valve shown in the first and second embodiments. is there. When the rotation angle is further increased, the water-side flow path is fully closed as shown in FIG. 10 (e), and only hot water is introduced into the valve body 15. In the hot and cold water mixing valve shown in the third embodiment, hot water and water are mixed in the above valve body rotation angle range.

  When the valve body 15 is rotated by the stepping motor from the reference position in the initial state, the water inlet 12, the hot water inlet 13, and the valve are within the valve body rotation angle range shown in FIGS. The area of the flow path formed between the body openings 15c and 15d varies depending on the rotation angle of the valve body, and passes through the valve body openings 15c and 15d from the water inlet 12 and the hot water inlet 13 in the valve chamber 11a. The flow rate of water and hot water flowing into the water changes. FIG. 11 shows the arrangement of the valve body openings on the hot water side and the water side, and the angles formed by the central axes of the circles in contact with the triangular portions of the valve body openings from the respective positions shown in the second embodiment. In the hot water mixing valve, the flow rate of hot water flowing into the valve chamber 1a from the hot water inlets 15c and 15d with respect to the valve body rotation angle is shifted by 10 degrees (when the second embodiment is 90 degrees, the third embodiment is 100 degrees). It represents the dependency. From FIG. 11, it can be seen that the linearity of the hot water flow rate with respect to the valve body rotation angle is further improved as compared with the hot water mixing valve shown in the second embodiment.

Further, FIG. 12 shows the relationship between the valve body rotation angle and the mixed water temperature in the third embodiment when the position of the opening is shifted by 10 degrees from the second embodiment and in the hot water mixing valve shifted by 20 degrees. It is shown. At this time, the temperatures of hot water and water introduced into the mixing valve are 80 ° C. and 20 ° C., respectively. From FIG. 12, when the position of the opening is shifted by 10 degrees from the second embodiment, the generally required hot water temperature range of 30 to 60 ° C. can be controlled at a valve body rotation angle of 5 to 82 degrees. It can be seen that the control can be performed at a valve body rotation angle of 5 to 91 degrees when shifted by 20 degrees. In the third embodiment, the range of the valve body rotation angle effective for temperature control can be further expanded than in the case of the hot and cold water mixing valve shown in the second embodiment (valve body rotation angle of 5 to 72 degrees). Therefore, temperature control with higher accuracy can be performed.
In addition, the valve body rotation angle range effective for temperature control is expanded by the substantially shifted angle, and as the shifted angle is increased, highly accurate temperature control becomes possible.
In the present embodiment, the arrangement of the opening on the hot water side and the water side provided in the valve body is a maximum of 20 on the basis of the arrangement of the valve body in the mixing valve shown in the first and second embodiments. Although the characteristics of the mixing valve when it is shifted to ° have been described, as described above, the control range is expanded by the shifted angle, so that the angle φ to be shifted is theoretically possible up to φ <90 °. However, if the angle φ to be shifted is too large, the cross-sectional area of the flow path when either the hot water side or the water side is fully opened becomes small and the maximum flow rate is remarkably reduced. Therefore, the actual value of φ is 60 °. It is considered that the degree is effective.

Embodiment 4 FIG.
The fourth embodiment is characterized in that, in the hot water / water mixing valve shown in the first to third embodiments, the valve box 11 is formed of a resin material by injection molding. In addition, about another structural member, since it is the same as the hot water mixing valve shown in either of Embodiment 1-3, detailed description is abbreviate | omitted. Further, the operation of the mixing valve including the rotating operation of the valve body is exactly the same as that of the hot water / water mixing valve shown in any of the first to third embodiments, and thus detailed description thereof is omitted.

  In the fourth embodiment, since a resin material is used as a material for the valve box 11 and is integrally formed by means such as injection molding, a light and inexpensive hot water / water mixing valve can be realized. Furthermore, the corrosion resistance against water can be greatly improved, and a hot and cold water mixing valve capable of stable operation over a long period of time and having high reliability can be realized. Moreover, since member structures other than the valve box 11 are the same as the hot water mixing valve shown to previous Embodiment 1-3, the effect similar to the effect obtained with these hot water mixing valves can be acquired. .

Embodiment 5 FIG.
FIG. 13 is a cross-sectional configuration diagram showing a schematic configuration of a hot and cold mixing valve according to Embodiment 5 of the present invention. In addition, the same code | symbol is attached | subjected about the same or equivalent member as the hot water mixing valve by previous Embodiment 1-4, and detailed description is abbreviate | omitted. In the present fifth embodiment, in a hot and cold water mixing valve having the same configuration as any one of the hot and cold water mixing valves shown in the third embodiment, a temperature detector 25 that detects the mixed water temperature downstream of the hot water and water discharge ports 14; A temperature setting unit 27 for setting the temperature of the mixed water from the outside, and a mixing valve controller 26 for driving the stepping motor 16 by performing comparison operation based on signals from the temperature detector 25 and the temperature setting unit 27 are provided.

Next, the operation of the present embodiment will be described.
When the desired mixed water temperature is set by the temperature setter 27, the mixed water temperature is detected by the temperature detector 25 constituted by the thermistor, and the set temperature signal of the temperature setter 27 and the detected temperature signal of the temperature detector 25 are mixed. The valve controller 26 takes in and compares them, inputs a drive signal in a direction to suppress the deviation to the stepping motor 16, and rotates the valve body 15 to adjust the flow rate ratio of hot water and water to be mixed. By repeating the operation, the obtained mixed water temperature is brought close to the set temperature. FIG. 14 is a flowchart showing the operation of the mixing valve according to the fifth embodiment of the present invention. In FIG. 14, the rotation angle of the valve body 15 is calculated in step S1, the mixed water temperature is detected in step S2, and the detected temperature T is taken in. In step S3, the set temperature Ts and the detected temperature T are compared, and the difference ΔT is calculated. If ΔT is larger than 0 in step S4, the valve body is rotated to the low temperature side (step S5), and if ΔT is smaller than 0, the valve body is rotated to the high temperature side (step S6). In step S7, it is determined whether or not the absolute value of ΔT is 20 degrees or more. If it is 20 degrees or more, the rotational movement amount of the valve body to the low temperature side or the high temperature side is set to 30 degrees in step S8. Return to, and detect the mixed water temperature again. When the absolute value of ΔT is 20 degrees or less, it is determined in step S9 whether or not the absolute value of ΔT is 10 degrees or more. When it is 10 degrees or more, the valve body is rotated to the low temperature side or the high temperature side in step S10. The moving amount is 10 degrees. Similarly, in steps S11 to S15, the absolute value of ΔT is 5 degrees or more, whether it is 3 degrees or more, and the value of the temperature difference between the set temperature is gradually lowered, and the amount of movement of the valve body at that time is reduced. decide. If the amount of rotational movement of the valve body becomes 0 degree in step S15, the rotation of the valve body is stopped in step S16. In addition, about the difference with preset temperature in step S7-step S14, and the movement amount of the valve body at that time, it does not need to be restricted to said each value.

  Regarding the acquisition of the temperature signal from the temperature detector 25 of the mixing valve controller 26, the temperature of the mixed water at the valve body rotation position is stabilized after the rotation operation of the valve body 15, and the temperature detector 25 detects further. This is performed after a certain time until the temperature value stabilizes. That is, temperature detection is not performed continuously, but intermittently at regular intervals. By performing such control, the temperature of the mixed water discharged from the hot water discharge port can be quickly brought close to the target temperature without causing overshoot or undershoot with respect to the set temperature. Further, since the hot and cold mixing valve itself has the configuration of the above-described Embodiment 3 (Embodiments 1 and 2 are possible), a flow characteristic having excellent linearity with respect to the valve body rotation angle can be obtained. In addition, it is possible to adjust the temperature smoothly linearly according to the rotation angle of the stepping motor 16 and the valve body 15, and it is possible to realize a water heater with excellent temperature controllability and excellent response.

In each of the above embodiments, the positions of the inlet 12 and the inlet 13 are shifted with respect to the flowing direction of the mixed fluid so that the inlets do not face each other, and the inlets are mutually However, the angle may be an angle other than 180 degrees.
Moreover, in each said embodiment, although the position of the inlet 12 and the inlet 13 is arrange | positioned so that a mutual inlet may not oppose, a part may oppose. In other words, if the position of the central axis of the introduction port at which the flow velocity of the fluid introduced from each introduction port is maximum is shifted with respect to the flowing direction of the mixed fluid, the dynamic pressure of the fluid flowing out from the introduction port The degree to which the flow directly interferes with the other flow is reduced, and this has the effect of improving the linearity of the mixed flow rate change of the two fluids with respect to the rotation angle of the valve body.

  In each of the above embodiments, water and hot water are introduced into the introduction port 12 and the introduction port 13, respectively, but two different types of fluids are caused to flow, and the mixed flow rate of the two fluids depending on the rotation angle of the valve body. Thus, a characteristic change of the mixed liquid that is smooth with respect to the rotation angle of the valve body can be obtained, and a mixing valve with good controllability and responsiveness can be provided.

  1, 11 Valve box, 1a, 11a Valve chamber, 2, 3 Inlet port, 4 Outlet port, 12 Water inlet, 13 Hot water inlet, 14 Hot water outlet, 5, 15 Valve body, 5a, 5b, 15a, 15b End, 5c, 5d, 15c, 15d Opening, 15c1, 15c1 Triangular part, 15c2, 15d2 Semicircular part, 6, 16 Stepping motor, 7, 17 Valve body drive shaft, 18 Screw hole, 19 Valve body presser, 20 , 21 Washer, 22, 23, 24 O-ring, 25 Temperature detector, 26 Mixing valve controller, 27 Temperature setting device, 100 Mixing valve.

Claims (6)

A valve box having an inlet for a first fluid, an inlet for a second fluid, and a discharge port for discharging a mixed fluid of the first fluid and the second fluid, the valve box being rotatable in the valve box In a mixing valve provided with a valve body having a plurality of openings provided according to the positions of the introduction ports and the discharge ports, and a valve body driving body for rotating the valve body,
The inlet of the first fluid and the inlet of the second fluid are arranged to be shifted with respect to the flowing direction of the mixed fluid,
The openings provided in the valve bodies in accordance with the positions of the respective inlets,
(1) one sometimes opening is positioned to be fully opened, the opening of the other side is in such have position location not fully closed and fully opened,
(2) when said one opening is positioned to be fully closed is at a position above the other opening is not fully open,
(3) At the rotational position of the valve body,
(3-1) In a range from the position where the one opening is fully open to the position where the other opening is fully open, the opening area monotonously decreases from the position where the one opening is fully open. A first range in which the opening area of the other opening monotonously increases;
(3-2) Outside the first range, when the opening area decreases monotonously from the position where the one opening is fully open, the opening area of the other opening also decreases monotonously and becomes fully closed. A range of 2,
(3-3) Outside the first range and the second range, when the opening area monotonously decreases from the position where the other opening is fully open, the opening area of the one opening also monotonously decreases. And a third range that is fully closed . The position where one opening is fully open, when the opening of the other side rotates the valve body so as to fully closed, that the rotation angle is disposed the openings so that the 60 degrees or less The mixing valve according to claim 1. The shape of the opening provided in the valve body in accordance with the position of the inlet port, to claim 1 or 2, its cross-sectional area is characterized by a shape smaller than the opening cross-sectional area of the inlet port The mixing valve described. The first fluid is water, the second fluid is hot water, the inlet close to the valve body driver is the first fluid inlet, and the other inlet is the second fluid inlet. mixing valve according to any one of claims 1 to 3, characterized in that. Mixing valve according to claim 1, any one of 4, characterized in that the valve box and the valve body is formed by resin. Mixing valve according to any one of claims 1 to 5, characterized by using the stepping motor as the valve body drive member.

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