JP7699894B2 - Mixing valve device - Google Patents

Description

Patent Law Article 30, Paragraph 2 applied "Product Guide / Price List (April 2021 Edition)" (electronic data) released on March 1, 2021 https://www.venn.co.jp/ https://www.venn.co.jp/content/download/6545/143032/file/2021 April Edition Product Guide Price List.pdf "Product Guide / Price List (April 2021 Edition)" (paper media) distributed on March 26, 2021 (issued on March 28, 2021)

The present invention relates to a mixing valve device that mixes water and steam to produce hot water.

Conventionally, as a mixing valve device of this type, for example, the type described in JP-A-63-225772 (Patent Document 1) has been known and is the mainstream. FIG. 11 shows a conventional type mixing valve device Sa created by the present inventor in accordance with the technology described in Patent Document 1. This conventional type mixing valve device Sa is equipped with a main body 1 having a mixing chamber 10 that mixes water flowing in from a water inlet 11 and steam flowing in from a steam inlet 12 and discharges them to an outlet (located in the front-to-back direction of the drawing). The main body 1 is provided with a water inlet chamber 16 formed across one wall 14 on the water inlet 11 side that forms the mixing chamber 10, and this one wall 14 is formed with a water inlet port 17 for allowing water to flow from the water inlet chamber 16 into the mixing chamber 10. The main body 1 is also provided with a steam inlet chamber 18 formed across the other wall 15 on the steam inlet 12 side that forms the mixing chamber 10, and this other wall 15 is formed with a valve port 20 through which steam can flow into the mixing chamber 10. The steam inlet chamber 18 is provided with a valve body 22 that opens and closes the valve port 20, and a coil spring 23 that biases the valve body 22 in the closing direction. The one wall 14 is provided with a valve rod 25 that is inserted into a through hole 24 provided in the one wall 14 so as to be movable forward and backward, one end of which supports the valve body 22 and the other end of which faces the water inlet chamber 16. The water inlet chamber 16 is provided with a forward and backward movement mechanism 30 that is connected to the other end of the valve rod 25 and moves the valve body 22 via the valve rod 25 against the biasing force of the coil spring 23 by water flowing into the water inlet chamber 16 to open the valve port 20, and moves the valve body 22 and the valve rod 25 by the biasing force of the coil spring 23 to close the valve port 20.

The forward/backward movement mechanism 30 is composed of a piston 31 to which the other end of the valve rod 25 is attached, and a cylinder portion 32 that constitutes part or all of the water inlet chamber 16 and in which the piston 31 can slide forward and backward. The water inlet chamber 16 is composed of an upper chamber 34 on the side of one wall 14 where the water inlet 17 is located, and a lower chamber 35 separated by the piston 31. An upper inlet 36 through which water flows in is formed in the upper chamber 34, and a lower inlet 37 through which water flows in is formed in the lower chamber 35. The pressure difference between the water flowing into the upper chamber 34 and the water flowing into the lower chamber 35 causes the valve rod 25 to move forward and backward via the piston 31, opening and closing the valve orifice 20 with the valve body 22. In the mixing valve device published in JP Patent Publication 63-225772 (Patent Document 1), the forward/backward movement mechanism is composed of a diaphragm rather than a piston.

In addition, a stroke adjustment mechanism 40 for adjusting the stroke of the valve body 22 is provided on the upper part of the main body 1. The stroke adjustment mechanism 40 is provided with an adjustment rod 41 that is provided coaxially with the valve rod 25 and penetrates the wall part constituting the steam inlet chamber 18, and is provided so as to be movable forward and backward by a screw means, and has a lower end surface against which the upper end surface of the valve body 22 can abut, and a handle 42 that is provided on the outside of the wall part constituting the steam inlet chamber 18 and is connected to the upper end side of the adjustment rod 41, and that moves the adjustment rod 41 forward and backward by rotating the adjustment rod 41. Furthermore, a water flow adjustment mechanism 50 is provided on the water inlet 11 side of the main body 1, and uses a needle valve 52 to adjust the flow rate of water flowing from the upper inlet 36 into the upper chamber 34.

In this mixing valve device Sa, the water inlet 17 is provided at equal intervals on a circumference centered on the axis of the through hole 24 in the one wall 14 near the through hole 24. The valve port 20 is formed in a valve seat body 100 attached to the other wall 15 via a screw means. The valve seat body 100 is formed in a cylindrical shape coaxial with the valve rod 25, and the valve port 20 that the valve body 22 opens and closes is formed on one end side, and multiple outlets 101 through which steam flows out from the valve port 20 are provided on the outer periphery of the other end side. In addition, the other end side of the valve seat body 100 is inserted and supported by a cylindrical protrusion 102 that is coaxial with the through hole 24 protruding from the inside of the water inlet 17 of the one wall 14 so as not to block the outlet 101. In addition, the other end side of the valve seat body 100, where the outlet 101 is located, is surrounded at a distance by a cylindrical outer wall 103 that is coaxial with the through hole 24.

When mixing water and steam to generate hot water in this mixing valve device Sa, the handle 42 of the stroke adjustment mechanism 40 is operated to move the adjustment rod 41 back and forth to adjust the stroke of the valve body 22 to the required stroke, and the needle valve 52 of the water volume adjustment mechanism 50 is operated to adjust the amount of water to the upper chamber 34 of the water inlet chamber 16 to the required water volume. In this state, water is allowed to flow from the water inlet 11 and steam is allowed to flow from the steam inlet 12. Water from the water inlet 11 flows into the upper chamber 34 and lower chamber 35 of the water inlet chamber 16, and the water that flows into the upper chamber 34 flows into the mixing chamber 10 from the water inlet 17. Due to the pressure difference between the water flowing into the upper chamber 35 and the water flowing into the lower chamber 35, a force acts on the piston 31 in the direction of the valve rod 25, and the valve body 22 is moved through the valve rod 25 against the biasing force of the coil spring 23, and the valve port 20 opens. As a result, steam flows in through the valve port 20 of the valve seat body 100, flows out through the outlet 101, flows into the mixing chamber 10, and mixes with the water that flows in through the water inlet 17 to become hot water, which is then discharged from the outlet (not shown).

Japanese Unexamined Patent Publication No. 63-225772

However, this conventional type of mixing valve device Sa had a problem in that the pressure fluctuation of the hot water flowing out from the outlet was often large, causing instability. The reason for this is thought to be that when steam flows in from the valve port 20 of the valve seat body 100 and enters the mixing chamber 10 from the outlet 101, the steam is concentrated at the outlet 101, and the steam flow becomes so strong that it immediately collides with the water from the water inlet 17, pushing the water back toward the water inlet 17. This blocks the inflow of water, causing a phenomenon in which water cannot flow sufficiently into the mixing chamber 10.

The present invention was made in consideration of the above problems, and aims to provide a mixing valve device that suppresses and stabilizes pressure fluctuations in the hot water flowing out from the outlet.

In order to achieve the above object, the mixing valve device of the present invention has a mixing chamber which mixes water flowing in from a water inlet and steam flowing in from a steam inlet and discharges the mixed water to an outlet, a water inlet is formed in one wall of the mixing chamber on the water inlet side for allowing water to flow into the mixing chamber, and a valve port which is opened and closed by a valve body and allows steam to flow into the mixing chamber when the valve body is open is formed in the other wall of the mixing chamber on the steam inlet side,
A movable disk is provided in the mixing chamber while facing the valve port.

With this, when water and steam are mixed to generate hot water, water is flowed from the water inlet and steam is flowed from the steam inlet. Water from the water inlet flows into the mixing chamber through the water inlet, and steam flows into the mixing chamber through the valve port of the valve seat body, and is mixed with the water flowing in from the water inlet to become hot water, which is then discharged from the outlet. In this case, a disk facing the valve port is provided in the mixing chamber, so that the steam flowing in from the valve port collides with this disk, and therefore the steam flow can be weakened at once. In addition, the steam is not concentrated as in the conventional system, but is evenly dispersed around the disk, and the steam is then mixed with the water. Since the steam is mixed without immediately colliding with the water flowing in from the water inlet, the pressure fluctuation of the hot water can be suppressed and the hot water can be stabilized. Moreover, since the disk moves in the mixing chamber, the disk acts as a cushion, which can also weaken the steam flow, and in this respect, the pressure fluctuation of the hot water can be suppressed and the hot water can be stabilized.

If necessary, a valve rod is provided, which is inserted into a through hole provided in the one wall, one end of which supports the valve body, and the other end of which is connected to a forward/reverse mechanism and is moved forward/reverse by the forward/reverse mechanism to open and close the valve body, the water outlet is formed near the through hole in the one wall, the disk is formed in a disk shape of a size facing the water outlet, an insertion hole is formed in the center of the disk through which the valve rod is inserted, and the disk is inserted into the valve rod and can move along the valve rod. As a result, the disk faces the water outlet, so that it is possible to reliably prevent steam from directly colliding with the water outlet, and pressure fluctuations can be further suppressed. In addition, since the disk is supported by having the insertion hole inserted through the valve rod, the disk is guided by the valve rod when moving , so that the movement of the disk can be stabilized.

If necessary, the water inlet ports may be provided at four or more equal intervals on a circumference centered on the axis of the through hole. By providing four or more water inlets at equal intervals, the inflow of water is dispersed, further suppressing pressure fluctuations. Eight or more ports are preferable.

If necessary, a stopper is provided on the one wall side of the disk, the lower surface of which abuts against the one wall side and which forms a gap between the outer periphery of the disk and the one wall side through which water can pass. Even if the disk is pushed by steam and the stopper abuts against the one wall side, there is a gap on the outer periphery of the disk, so water can pass through, ensuring mixing with the steam.

More specifically, a protrusion in which the valve rod through hole is formed is provided on the mixing chamber side of the one wall, the water flow port is formed around the protrusion, a cylindrical upright wall is provided on the mixing chamber side of the one wall around the water flow port and coaxial with the through hole, a cylindrical stopper is provided on the one wall side of the disk, in which the insertion hole is formed and whose lower surface hits the upper surface of the protrusion to stop the downward movement of the disk, and a cylindrical hanging wall is provided on the one wall side of the outer periphery of the disk, which has a lower end surface facing the upper end surface of the upright wall when the stopper hits the protrusion to form a gap through which water can flow out, and is coaxial with the insertion hole. Even if the disk is pushed by steam and the stopper hits the protrusion, there is a gap on the outer periphery of the disk, so that water can pass through, and mixing with steam can be ensured. In addition, water from the water flow port is evenly dispersed from the upper end surface of the upright wall toward the periphery, so mixing with steam can also be ensured in this respect.

If necessary, a cylindrical outer wall that is higher than the standing wall and is coaxial with the through hole is provided on the mixing chamber side of the one wall and around the standing wall. This allows the water that passes through the gap on the outer periphery of the disk to mix with the steam while hitting the outer wall, making it possible to mix with the steam more reliably.

More specifically, the device is provided with a main body having a mixing chamber for mixing water flowing in from a water inlet and steam flowing in from a steam inlet as necessary and discharging the resulting mixture to an outlet, the main body is provided with a water inlet chamber formed across one wall on the water inlet side that forms the mixing chamber, and a water inlet is formed in the one wall for allowing water to flow from the water inlet chamber into the mixing chamber, the main body is provided with a steam inlet chamber formed across the other wall on the steam inlet side that forms the mixing chamber, and a valve opening is formed in the other wall through which steam can flow into the mixing chamber, and the steam inlet chamber is provided with a valve opening. A valve body is provided to open and close the valve port, and a coil spring is provided to bias the valve body in the closing direction. A valve rod is provided which is inserted into a through hole in one of the walls so as to be movable back and forth, with one end supporting the valve body and the other end facing the water inlet chamber. A forward and backward movement mechanism is provided which is connected to the other end of the valve rod and moves the valve body via the valve rod against the biasing force of the coil spring by water flowing into the water inlet chamber to open the valve port, and moves the valve body and valve rod by the biasing force of the coil spring to close the valve port.

If necessary, the forward and backward movement mechanism is configured to include a piston to which the other end of the valve rod is attached, and a cylinder portion that constitutes part or all of the water inlet chamber and in which the piston can slide forward and backward, the water inlet chamber is configured to be composed of an upper chamber on one wall side where the water outlet is located, and a lower chamber partitioned by the piston, an upper inlet is formed through which water flows into the upper chamber, and a lower inlet is formed through which water flows into the lower chamber, and the valve rod is moved forward and backward via the piston due to the pressure difference between the water flowing into the upper chamber and the water flowing into the lower chamber, and the valve orifice is opened and closed by the valve element. The piston and cylinder can smooth the movement of the valve rod and valve element.

Furthermore, if necessary, a water volume adjustment mechanism is provided on the water inlet side of the main body to adjust the flow rate of water flowing from the upper inlet into the upper chamber. This allows the amount of hot water to be adjusted.

Furthermore, if necessary, a stroke adjustment mechanism for adjusting the stroke of the valve body is provided, and the stroke adjustment mechanism is configured to include an adjustment rod that is provided coaxially with the valve rod and penetrates the wall portion constituting the steam inlet chamber, and is movable back and forth by a screw means, and has a lower end surface against which the upper end surface of the valve body can abut, and a handle that is provided on the outside of the wall portion constituting the steam inlet chamber and is connected to the upper end side of the adjustment rod, and that moves the adjustment rod back and forth by rotating the adjustment rod. The temperature of the hot water can be adjusted.

As explained above, according to the mixing valve device of the present invention, a disk facing the valve port is provided in the mixing chamber, so that the steam flowing in from the valve port collides with this disk, and therefore the steam flow can be weakened in an instant, and the steam is not collected as in the conventional device, but is evenly dispersed around the disk, and then mixed with the water, so that the steam does not immediately collide with the water flowing in from the water inlet, and thus the pressure fluctuation of the hot water can be suppressed and the water can be stabilized. Moreover, since the disk moves in the mixing chamber, the disk acts as a cushion, which also weakens the steam flow, and in this respect the pressure fluctuation of the hot water can be suppressed and the water can be stabilized.

1 is a perspective view showing a mixing valve device according to an embodiment of the present invention; 1 is an exploded perspective view showing a mixing valve device according to an embodiment of the present invention; 2 is a cross-sectional view taken along line AA in FIG. 1 , showing the mixing valve device according to the embodiment of the present invention in a fully open state of the valve body. 2 is a cross-sectional view taken along line BB in FIG. 1 , showing the mixing valve device according to the embodiment of the present invention in a fully open state of the valve body. 1A and 1B show a mixing valve device according to an embodiment of the present invention with a valve body in a fully closed state, where FIG. 1A is a cross-sectional view taken along line AA in FIG. 1, and FIG. 1A and 1B show a main part of a mixing valve device according to an embodiment of the present invention, in which FIG. 1A shows the bottom surface of a disk, and FIG. 1 is an enlarged cross-sectional view showing a main part of a mixing valve device according to an embodiment of the present invention. FIG. 2 is a diagram showing a test device used in test examples of the mixing valve device according to the embodiment and the comparative example of the present invention. FIG. 1 is a graph showing test results (1), (2), and (3) of the mixing valve device according to the embodiment of the present invention in comparison with test results (1), (2), and (3) of the mixing valve device according to the comparative example. FIG. 11 is a graph showing test results (4), (5), and (6) of the mixing valve device according to the embodiment of the present invention in comparison with test results (4), (5), and (6) of the mixing valve device according to the comparative example. FIG. 1 is a cross-sectional view showing a conventional type mixing valve device (a comparative example related to a test example).

Hereinafter, a mixing valve device according to an embodiment of the present invention will be described in detail with reference to the accompanying drawings. Note that the same components as those described above will be denoted by the same reference numerals.
As shown in Figures 1 to 7, a mixing valve device S according to an embodiment of the present invention mixes water and steam to produce hot water, and is equipped with a metal body 1 having a mixing chamber 10 that mixes water flowing in from a water inlet 11 and steam flowing in from a steam inlet 12 and discharges the mixed water to an outlet 13.

As shown in Fig. 1 or 2, the main body 1 is provided with a lower body 2, an inner body 3 assembled to the lower body 2, an upper body 5 fixed to the lower body 2 by bolts 4 via packing 4a, and a cover 7 fixed to the upper body 5 by bolts 6 via packing 6a along the vertical base axis P. The lower body 2 has a water inlet 11 and a steam inlet 12 formed on one axis Q perpendicular to the base axis P, and the upper body 5 has two outlets 13 formed on the other axis R perpendicular to the base axis P, above one axis Q of the water inlet 11 and the steam inlet 12. The one axis Q and the other axis R are perpendicular to each other when viewed from above. Both outlets 13 may be made effective, or one of them may be blocked with a plug 8 (Figs. 4, 5(b) and 7) to make only one effective. In the embodiment, only one is made effective. The mixing chamber 10 is surrounded by one wall 14 formed by the inner body 3 and the other wall 15 formed by the inner surface of the upper body 5.

The main body 1 is provided with a water inlet chamber 16 formed across one wall 14 on the water inlet 11 side forming the mixing chamber 10, and this one wall 14 is formed with a water inlet 17 for allowing water to flow from the water inlet chamber 16 into the mixing chamber 10. The water inlet 17 is provided at equal intervals on a circumference with the base axis P as its axis, and four or more (eight in the embodiment) are provided. The main body 1 is also provided with a steam inlet chamber 18 formed across the other wall 15 on the steam inlet 12 side forming the mixing chamber 10, and this other wall 15 is formed with a valve port 20 with the base axis P as its axis through which steam can flow into the mixing chamber 10. The valve port 20 is formed in a valve seat body 21 attached to the other wall 15 via a screw means. The valve seat body 21 is formed in a cylindrical shape with the base axis P as its axis, and the valve port 20 is formed on one end side, and the other end side is formed to expand downward.

The steam inlet chamber 18 is provided with a valve body 22 with an axis P as its axis for opening and closing the valve port 20, and a coil spring 23 with an axis P as its axis for biasing the valve body 22 in the closing direction. The one wall 14 is provided with a valve rod 25 with an axis P as its axis, one end of which supports the valve body 22 and the other end of which faces the water inlet chamber 16, which is inserted in a through hole 24 provided in the one wall 14 so as to be movable forward and backward. The valve rod 25 has an axis P and supports the valve body 22 and the other end of which faces the water inlet chamber 16. The water inlet chamber 16 is provided with a forward and backward movement mechanism 30 that is connected to the other end of the valve rod 25 and moves the valve body 22 through the valve rod 25 against the biasing force of the coil spring 23 by water flowing into the water inlet chamber 16 to open the valve port 20, while moving the valve body 22 and the valve rod 25 by the biasing force of the coil spring 23 to close the valve port 20.

The forward/backward movement mechanism 30 is configured with a piston 31 with its axis on the base axis P to which the other end of the valve rod 25 is attached, and a cylinder portion 32 composed of an internal body 3 with its axis on the base axis P that constitutes part or all of the water inlet chamber 16 (part of the upper side in the embodiment) and on which the piston 31 can slide forward and backward. Reference numeral 33 denotes an O-ring provided on the outer periphery of the piston 31. The water inlet chamber 16 is composed of an upper chamber 34 on the side of one wall 14 where the water inlet 17 is located, and a lower chamber 35 separated by the piston 31. The upper chamber 34 is formed with an upper inlet 36 through which water flows in, and the lower chamber 35 is formed with a lower inlet 37 through which water flows in. The pressure difference between the water flowing into the upper chamber 34 and the water flowing into the lower chamber 35 causes the valve rod 25 to move forward and backward via the piston 31, opening and closing the valve orifice 20 with the valve body 22.

In addition, a stroke adjustment mechanism 40 is provided on the upper part of the main body 1 to adjust the stroke of the valve body 22. The stroke adjustment mechanism 40 is provided with an adjustment rod 41 that is provided through the cover 7, which is the wall part constituting the steam inlet chamber 18, coaxially with the valve rod 25 (with the base axis P as the axis) and is provided so as to be movable forward and backward by a screw means and has a lower end surface 41a against which the upper end surface 22a of the valve body 22 can abut, and a handle 42 that is provided on the outside of the wall part constituting the steam inlet chamber 18 and is connected to the upper end side of the adjustment rod 41 to rotate the adjustment rod 41 to move the adjustment rod 41 forward and backward. 43 is a packing that seals the cover 7 and the adjustment rod 41, and 44 is a retaining nut for the packing 43 that is screwed into the female thread of the cover 7 via a retaining ring 45.

A water flow rate adjustment mechanism 50 is provided on the water inlet 11 side of the main body 1 to adjust the flow rate of water flowing from the upper inlet 36 into the upper chamber 34. The water flow rate adjustment mechanism 50 consists of a holder 51 fixed to the upper body 5 by a screw means, a well-known needle valve 52 that is screwed into the holder 51 via a screw means so that it can move forward and backward, and a lock nut 53 that is provided on the upper end side of the needle valve 52 via a screw means and locks the needle valve 52 at the required screw-in position. Reference numeral 54 denotes an O-ring for sealing that is fitted onto the needle valve 52.

In this mixing valve device S, a disk 60 that can move while facing the valve port 20 is provided in the mixing chamber 10. In detail, as described above, the water inlet 17 is provided in the vicinity of the through hole 24 of the one wall 14, and four or more (eight in the embodiment) water inlet ports 17 are provided at equal intervals on a circumference centered on the axis of the through hole 24 (with the base axis P as the axis). The disk 60 is formed in a disk shape of a size that faces the water inlet port 17. An insertion hole 61 through which the valve rod 25 is inserted is formed in the center of the disk 60, and the disk 60 is provided so as to be movable along the valve rod 25 with the insertion hole 61 inserted through the valve rod 25.

Further, a stopper 62 is provided on the one wall 14 side of the disk 60, the lower surface of which abuts against the one wall 14 side and forms a gap e through which water can pass between the outer periphery of the disk 60 and the one wall 14 side. Specifically, a protruding portion 63 in which the through hole 24 of the valve rod 25 is formed is provided on the mixing chamber 10 side of the one wall 14, and the water inlet 17 is formed around this protruding portion 63. Further, a cylindrical upright wall 64 (with the base axis P as its axis) coaxial with the through hole 24 is provided on the mixing chamber 10 side of the one wall 14 and around the water inlet 17. Further, a cylindrical stopper 62 is provided on the one wall 14 side of the disk 60, the lower surface 62a of which abuts against the upper surface 63a of the protruding portion 63 to stop the downward movement of the disk 60. Furthermore, a cylindrical hanging wall 65 is provided on the one wall 14 side of the outer periphery of the disk 60, the lower end surface 65a of which faces the upper end surface 64a of the standing wall 64 to form a gap e through which water can flow out when the stopper 62 hits the protruding portion 63, and which is coaxial with the insertion hole 61 (with the base axis P as its axis). Furthermore, a cylindrical outer wall 66 is provided around the standing wall 64 on the mixing chamber 10 side of the one wall 14, the outer periphery of which is higher than the standing wall 64 and is coaxial with the through hole 24 (with the base axis P as its axis).

Therefore, when water and steam are mixed to generate hot water by the mixing valve device S according to this embodiment, the handle 42 of the stroke adjustment mechanism 40 is operated to move the adjustment rod 41 forward and backward, adjusting the stroke of the valve body 22 to the required stroke, and the needle valve 52 of the water volume adjustment mechanism 50 is operated to adjust the amount of water to the upper chamber 34 of the water inlet chamber 16 to the required water volume. In this state, water is flowed from the water inlet 11 and steam is flowed from the steam inlet 12. Water from the water inlet 11 flows into the upper chamber 34 and lower chamber 35 of the water inlet chamber 16, and the water that flows into the upper chamber 34 flows into the mixing chamber 10 from the water inlet 17, and a force in the forward direction of the valve rod 25 acts on the piston 31 due to the pressure difference between the water flowing into the upper chamber 34 and the water flowing into the lower chamber 35, and the valve body 22 is moved through the valve rod 25 against the biasing force of the coil spring 23, and the valve port 20 opens. As a result, steam flows into the mixing chamber 10 through the valve port 20 of the valve seat body 21, mixes with the water flowing in through the water inlet 17, and becomes hot water, which is then discharged from the outlet 13.

In this case, as shown in Fig. 7, a disk 60 facing the valve port 20 is provided in the mixing chamber 10, so that the steam flowing in from the valve port 20 collides with this disk 60, and therefore the steam flow can be weakened at once, and the steam is not collected as in the conventional case, but is evenly dispersed around the disk 60, and the steam is then mixed with the water, so that the steam is not immediately collided with the water flowing in from the water inlet 17, and the pressure fluctuation of the hot water can be suppressed and the hot water can be stabilized. Moreover, since the disk 60 moves in the mixing chamber 10, the disk 60 acts as a cushion, which can also weaken the steam flow, and in this respect, the pressure fluctuation of the hot water can be suppressed and the hot water can be stabilized.

In addition, since the disk 60 is formed in a disk shape with a size that faces the water inlet 17, it is possible to reliably prevent steam from directly colliding with the water inlet 17, and pressure fluctuations can be further suppressed. In addition, since the disk 60 is supported by having the valve rod 25 inserted through the insertion hole 61, the disk 60 is guided by the valve rod 25 when moving , and thus the movement of the disk 60 can be stabilized. Furthermore, since the water inlet 17 is provided at four or more equal intervals on a circumference centered on the axis of the through hole 24 (eight in the embodiment), the inflow of water into the mixing chamber 10 is dispersed, and pressure fluctuations can be further suppressed.

Furthermore, as shown in Figure 7, the disc 60 may be pushed by the steam, causing the stopper 62 to strike the protrusion 63. In this case, however, since there is a gap e on the outer periphery of the disc 60, water can pass through, ensuring that the water mixes with the steam. In addition, the water from the water outlet 17 is evenly dispersed from the upper end surface 64a of the standing wall 64 toward the periphery, ensuring that the water mixes with the steam.

Furthermore, since there is an outer wall 66 around the upright wall 64 that is taller than the upright wall 64, the water that passes through the gap e on the outer periphery of the disk 60 hits the outer wall 66 and mixes with the steam, which makes it possible to mix with the steam even more reliably.

<Test Example>
The mixing valve device S provided with the disk 60 according to the above embodiment was used as an example, and the conventional type mixing valve device Sa without the disk 60 shown in Fig. 11 was used as a comparative example. A test device T shown in Fig. 8 was fabricated, and the following tests were performed on each of the mixing valve devices S and Sa. The test device T was configured by connecting a water piping 75, which is connected in order to a pressure reducing valve 71, a flow meter 72, a check valve 73, and a pressure gauge 74 from a water header 70 that stores and supplies water, to the water inlet 11 of the mixing valve device S and Sa, connecting a steam piping 84, which is connected in order to a pressure reducing valve 81, a check valve 82, and a pressure gauge 83 from a steam header 80 that stores and supplies steam generated in a boiler (not shown) to the steam inlet 12 of the mixing valve device S and Sa, and connecting a hot water piping 87, which is equipped with a pressure gauge 85 and a stop valve 86, to the outlet 13 of the mixing valve device S and Sa. A thermometer 90 was attached to the outlet 13 of the mixing valve device S and Sa.

In the test, the feed water pressure (pressure on pressure gauge 74), steam pressure (pressure on pressure gauge 83) and target hot water outlet pressure were preset to the following six set conditions, and the handle 42 was manually operated from the fully closed state (Figure 5) of the valve body 22 to the fully open state (Figures 3 and 4), gradually increasing the hot water temperature at the hot water outlet 13, and the change in the actual hot water outlet pressure (pressure gauge 85) at each temperature (thermometer 90) was measured.

Setting conditions (1) Feed water pressure 0.3 MPa, steam pressure 0.3 MPa, target hot water outlet pressure 0.2 MPa
(2) Feedwater pressure 0.3 MPa, steam pressure 0.4 MPa, target hot water outlet pressure 0.2 MPa
(3) Feedwater pressure 0.4 MPa, steam pressure 0.4 MPa, target hot water outlet pressure 0.3 MPa
(4) Feedwater pressure 0.4 MPa, steam pressure 0.5 MPa, target hot water outlet pressure 0.3 MPa
(5) Feedwater pressure 0.5MPa, steam pressure 0.5MPa, target hot water outlet pressure 0.3MPa
(6) Feedwater pressure 0.5 MPa, steam pressure 0.5 MPa, target hot water outlet pressure 0.4 MPa

The results are shown in Figures 9 and 10. In Figures 9 and 10, the symbols (1) to (6) attached to the examples and comparative examples correspond to the above-mentioned set conditions (1) to (6). From these results, it can be seen that the example with the disk 60 has extremely little change in hot water outlet pressure and is stable compared to the conventional type comparative example without the disk 60.

In the above embodiment, the disk 60 is formed in a disk shape, but this is not necessarily limited to this, and it may be formed in any shape under the condition that it faces the valve port 20, and may be modified as appropriate. Also, in the above embodiment, the forward/backward movement mechanism 30 is configured as a piston and cylinder type, but this is not necessarily limited to this, and it may be a diaphragm type instead of the piston 31, and may be modified as appropriate. Those skilled in the art can easily make many modifications to these exemplary embodiments without substantially departing from the novel teachings and effects of the present invention, and many of these modifications are included in the scope of the present invention.

S mixing valve device 1 main body 2 lower body 3 internal body 4 bolt 4a packing 5 upper body 6 bolt 6a packing 7 cover 8 plug P base axis Q one axis R other axis 10 mixing chamber 11 water inlet 12 steam inlet 13 outlet 14 one wall 15 other wall 16 water inlet chamber 17 water inlet 18 steam inlet chamber 20 valve port 21 valve seat body 22 valve body 22a upper end surface 23 coil spring 24 through hole 25 valve rod 30 forward/backward movement mechanism 31 piston 32 cylinder portion 33 O-ring 34 upper chamber 35 lower chamber 36 upper inlet 37 lower inlet 40 stroke adjustment mechanism 41 adjustment rod 41a lower end surface 42 handle 43 packing 44 retaining nut 45 retaining ring 50 water volume adjustment mechanism 51 retaining body 52 Needle valve 53 Lock nut 54 O-ring 60 Disk 61 Insertion hole 62 Stopper 62a Lower surface e Gap 63 Projection portion 63a Upper surface 64 Standing wall 64a Upper end surface 65 Hanging wall 65a Lower end surface 66 Outer wall T Test device Sa Conventional type mixing valve device 70 Water header 71 Pressure reducing valve 72 Flowmeter 73 Check valve 74 Pressure gauge 75 Water piping 80 Steam header 81 Pressure reducing valve 82 Check valve 83 Pressure gauge 84 Steam piping 85 Pressure gauge 86 Stop valve 87 Hot water piping 90 Thermometer

Claims (9)

A mixing valve device having a mixing chamber which mixes water flowing in from a water inlet and steam flowing in from a steam inlet and discharges the mixed water to an outlet, a water inlet is formed in one wall of the mixing chamber on the water inlet side for allowing water to flow into the mixing chamber, and a valve port which is opened and closed by a valve body and allows steam to flow into the mixing chamber when the valve body is open is formed in the other wall of the mixing chamber on the steam inlet side,
a disk movable in the mixing chamber while facing the valve port ;
a valve rod is provided which is inserted into a through hole formed in the one wall, one end of which supports the valve body and the other end of which is connected to an advancing and retreating mechanism and is moved back and forth by the advancing and retreating mechanism to open and close the valve body; the water outlet is formed near the through hole in the one wall; the disk is formed in a disk shape of a size which faces the water outlet; an insertion hole through which the valve rod is inserted is formed in the center of the disk; and the disk is movable along the valve rod by inserting the valve rod through the insertion hole . 2. The mixing valve device according to claim 1 , wherein four or more of the water flow ports are provided at equal intervals on a circumference centered on the axis of the through hole. 3. The mixing valve device according to claim 1, further comprising a stopper on said one wall side of said disk, the lower surface of which abuts against said one wall side and which forms a gap between the outer periphery of said disk and said one wall side through which water can pass. 3. The mixing valve device according to claim 1, further comprising: a protruding portion on the mixing chamber side of said one wall in which a through hole for said valve stem is formed; said flow outlet is formed around said protruding portion; a cylindrical upright wall is provided on the mixing chamber side of said one wall around said flow outlet and coaxial with said through hole; a cylindrical stopper is provided on said one wall side of said disk in which said insertion hole is formed and whose lower surface abuts against an upper surface of said protruding portion to stop downward movement of said disk; and a cylindrical hanging wall is provided on one wall side of the outer periphery of the disk, said cylindrical hanging wall being coaxial with said insertion hole and having a lower end surface facing the upper end surface of said upright wall when said stopper abuts against said protruding portion to form a gap through which water can flow out . 5. The mixing valve device according to claim 4, further comprising a cylindrical outer wall, which is higher than the standing wall and coaxial with the through hole, and which is disposed around the standing wall on the mixing chamber side of the one wall. a main body having a mixing chamber for mixing water flowing in from a water inlet and steam flowing in from a steam inlet and discharging the resulting mixture to an outlet, a water inlet chamber formed in the main body across one wall on the water inlet side that forms the mixing chamber, a water flow port formed in the one wall for allowing water to flow from the water inlet chamber into the mixing chamber, a steam inlet chamber formed in the main body across another wall on the steam inlet side that forms the mixing chamber, a valve port formed in the other wall through which steam can flow into the mixing chamber, a valve body for opening and closing the valve port provided in the steam inlet chamber, a valve rod having one end which is inserted into a through hole in the one wall so as to be movable back and forth, one end of which supports the valve rod and the other end of which faces the water inlet chamber; and a forward/backward movement mechanism which is connected to the other end of the valve rod and which moves the valve rod via the valve rod against the biasing force of the coil spring by water flowing into the water inlet chamber to open the valve port, and which moves the valve rod and the valve rod by the biasing force of the coil spring to close the valve port. 7. The mixing valve device according to claim 6, wherein the advancing/retreating mechanism comprises a piston to which the other end of the valve stem is attached, and a cylinder portion which constitutes part or all of the water inlet chamber and in which the piston can slide back and forth, the water inlet chamber being composed of an upper chamber on one wall side where the water flow port is located, and a lower chamber partitioned by the piston, an upper inlet through which water flows into the upper chamber is formed, and a lower inlet through which water flows into the lower chamber is formed, and the valve stem is moved back and forth via the piston due to the pressure difference between the water flowing into the upper chamber and the water flowing into the lower chamber, thereby opening and closing the valve port by the valve body. 8. The mixing valve device according to claim 7 , further comprising a water flow rate adjusting mechanism provided on the water inlet side of the main body for adjusting the flow rate of water flowing from the upper inlet into the upper chamber. 9. The mixing valve device according to claim 6, further comprising a stroke adjustment mechanism for adjusting the stroke of the valve disc, the stroke adjustment mechanism comprising an adjustment rod that is provided coaxially with the valve stem and penetrates a wall portion constituting the steam inlet chamber, the adjustment rod being movable forward and backward by a screw means and having a lower end surface with which the upper end surface of the valve disc can abut, and a handle that is provided outside the wall portion constituting the steam inlet chamber and is linked to the upper end side of the adjustment rod for rotating the adjustment rod to move the adjustment rod forward and backward.

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