JPH0760089A - Steam and water mixer - Google Patents

Abstract

(57) [Summary] [Purpose] In a mixer that mixes water and steam to produce hot water, while improving thermal efficiency, reliability is improved without causing damage to parts, and hammer noise, vibration, etc. To prevent the occurrence of. As a steam blowing device 30 of a mixer 20, one end communicates with a steam inlet 25, a protective pipe 32 having a steam jetting hole 31 on a peripheral wall, and a protective pipe 32 mounted inside the protective pipe 32, through which steam passes And a porous member 33 having possible pores.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a mixer used in, for example, an automatic hot water supply system to directly mix steam and water to produce hot water.

[0002]

2. Description of the Related Art Heretofore, there has been known a mixer for efficiently producing hot water by directly mixing steam and water. An example of this kind of mixer is shown in FIG.

In the mixer 20 shown in FIG. 4, water W is introduced from a water inlet 22 into a mixing chamber 21 for mixing steam and water.
Will be introduced. In addition, a pipe-shaped steam blowing device 30 having a large number of small holes 23 is inserted in the mixing chamber 21, and the steam S introduced from the steam inlet 25 enters the mixing chamber 21 from the small holes 23 in a bubble state. Blown out. Then, in the mixing chamber 21, the water W and the steam S are mixed and the temperature is raised, and the hot water H
And is taken out from the hot water outlet 26.

By the way, in the above mixer 20, hot water H
In order to keep the temperature of 1 constant, the supply amount of the steam S is adjusted by the steam amount adjusting valve 8. Here, if the blowing speed of the steam S blown out from the small holes 23 is reduced to some extent,
The noise such as a hammer sound generated when the blown steam is instantaneously condensed is reduced, and the steam S having a slow blowing speed is also generated.
Since the flow of water W is less likely to be disturbed by the steam S
Since the water and the water W are locally and uniformly mixed, the hot water supply temperature is stable. However, in the conventional mixer, when the supply amount of the steam S is increased, the blowing speed of the steam S blown out from the small holes 23 is increased, so that the noise is increased,
There was a problem that the hot water supply temperature became unstable.

Therefore, the applicant of the present application has previously filed Japanese Patent Application No.
No. 324780 proposes a mixer capable of solving the above-mentioned problems by controlling the steam blowing speed according to the supply amount of steam S.

The contents of the proposal are, as shown in FIG. 3, an introduction pipe portion 27 having a water introduction port 22 and a steam introduction port 25.
And a mixing pipe part 28 having a mixing chamber 21 and a hot water discharge port 26 are assembled with a bolt (not shown) to form a main body case 24 of the mixer, and a steam blowing device is provided inside the main body case 24. 30 is provided. Also, this steam blowing device 30
Is a tubular body 30A having both ends in the longitudinal direction opened and a plurality of vapor passage holes a and b provided upstream and downstream of the peripheral wall, and has a diameter smaller than that of the tubular body 30A, and has a cotter pin 30B inside thereof. The tubular body 30A is composed of a coil spring 30C which is attached so as to be capable of expanding and contracting via a pressure receiving member 30D which is provided on the tip side of the coil spring 30C.
One end side in the length direction of is connected to the steam introducing port 25 of the introducing pipe portion 27 so as to communicate with it, and the cylindrical body 30A is positioned inside the mixing pipe portion 28.

In the above mixer 20, the steam inlet 2
The coil spring 30C expands and contracts in accordance with the pressure of the steam S supplied from the coil 5, and the gap between the coils is adjusted to a large or small size. From this gap to the mixing chamber 21 via the vapor passage holes a and b. The rate of blown steam is controlled.
For example, when the supply amount of the steam S increases, the steam pressure in the coil spring 30C rises, and the pressure received by the pressure receiving member 30D becomes large. Along with this, the coil spring 30C expands and the gap between the coils increases. Is increased, it is possible to suppress an increase in the blowing speed of the steam S, and as a result, it is possible to reduce noise and stabilize the hot water supply temperature.

[0008]

However, according to the mixer 20 described above, the coil spring 30C slides inside the tubular body 30A while expanding and contracting in accordance with the supply amount of the steam S. , The coil spring 30
It was found that there was a problem that the durability of C deteriorated and it was damaged with long-term use. Further, when the coil spring 30C expands with an increase in the steam supply amount, the gap between the coils becomes large, and the steam S contacts the water W in a large bubble state and condenses. It was also found that there is a problem that noise and vibration occur, which adversely affects the piping system and peripheral equipment.

The present invention has been made in view of the above problems, and its purpose is to improve reliability without causing damage to parts while reducing noise and stabilizing hot water supply temperature. The purpose is to provide a steam and water mixer.

[0010]

In order to achieve the above object, the steam blowing device used in the mixer of the first invention is composed of a porous member having pores through which steam passes.

Further, in the second aspect of the present invention, the steam blowing device has a protective tube having one end communicating with the steam introducing port and having a steam ejection hole in at least the peripheral wall of the peripheral wall and the other end wall, and the protective tube. And a porous member having pores that allow vapor to pass therethrough, which is attached to the inside of the portion provided with the vapor ejection holes.

[0012]

According to the first aspect of the invention, even if the amount of steam supplied to the mixing chamber increases, the steam is gradually blown out into the mixing chamber while passing through the pores of the porous member. In addition, the steam is divided into small bubbles when passing through the pores of the porous member, and the steam and water come into contact with each other in the small bubble state. Therefore, noise such as a hammer sound is reduced to reduce discomfort, and vibration caused by the hammer sound is prevented from occurring, so that the piping system and peripheral devices are not adversely affected. Further, since the steam blowing speed becomes slower, the flow of water is less likely to be disturbed by the steam, and as a result, the steam and water are locally and uniformly mixed, and the hot water supply temperature is stabilized. Furthermore, in the above-mentioned configuration, since a sliding component such as a coil spring is not used, the reliability can be improved without causing damage to the component.

According to the second aspect of the invention, since the porous member is protected by the protective tube, the reliability of the mixer is further improved.

[0014]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 2 shows an example of an automatic hot water supply system to which the mixer of the present invention is applied. In FIG. 2, a tank 1 is provided with a float valve 2 for keeping the water level constant, and Cold water C from the water supply pipe 3 to the tank 1 by the valve 2
The flow rate is controlled. Also, the tank 1
A circulation path 4 is provided in the circulation path 4, and a mixer 20 is provided in the circulation path 4.
A pump 5 for supplying water W is installed.

Further, the mixer 20 has a temperature sensor 6
Is provided, and the opening of the steam amount adjusting valve 8 is adjusted by the output from the controller 7 based on the detection result to control the supply amount of the steam S from the steam pipe 9 to the mixer 20. There is. Further, the mixer 20 is provided with a hot water discharge pipe 10, a discharge pipe 11 for extracting the hot water H to the outside is branched and connected to the discharge pipe 1, and
The tip 12 of 0 is inserted in the tank 1.

As shown in FIG. 1, the mixer 20 comprises a main body case 24 and a steam blowing device 30, and since the main body case 24 is the same as that shown in FIG. 3, the same or equivalent. The same reference numerals are given to the parts and the details thereof will be omitted, and the steam blowing device 30 will be described. This steam blowing device 30 has a cylindrical protective tube 32 having both upper and lower ends opened in the longitudinal direction and a large number of steam jetting holes 31 provided on the peripheral wall, and the steam jetting hole 31 facing the inside of the protective tube 32. It is composed of a cylindrical porous member 33 which is arranged in a circular shape.

The protective tube 32 is fixed at its one end on the opening side to an elbow portion 27a which communicates with the steam introducing port 25 of the introducing pipe portion 27 by a screw 32a.
Is entirely located in the mixing chamber 21 in the mixing pipe portion 28, and a cap 34 is attached to the other end side of the protection pipe 32.

Further, the porous member 33 is, for example,
Made of stainless steel porous mesh, diameter 1 ~
It has a large number of pores of about 40 μm through which vapor can pass.

As shown in the figure, the steam ejection holes 31 may be formed at regular intervals in the lengthwise direction of the protection tube 32. In that case, the steam is upstream (see the figure). Since it is introduced into the steam blowing device 30 from the lower side), the amount of steam ejected from the steam ejecting hole 31 on the upstream side (lower side) is
The amount is larger than the amount of steam ejected from the steam ejection holes 31 on the downstream side (the upper side in the figure). Therefore, the steam ejection holes 31 are
If it is formed so that the interval is large on the upstream side and small on the downstream side, or if the opening diameter is small on the upstream side and the opening diameter is large on the downstream side, The amount of steam blown from the steam ejection holes 31 into the mixing chamber 21 is made uniform in the length direction of the protection tube 32, and the mixing chamber 2
It is possible to uniformly mix the steam S and the water W in the unit 1 and smoothly raise the temperature.

A spiral projection 28a is formed on the inner peripheral wall of the introduction pipe portion 28 so as to enhance the mixing efficiency of the steam S and the water W supplied into the mixing chamber 21.

Further, in the embodiment shown in FIG. 1, a valve seat 35a is provided at a connecting portion between the elbow portion 27a of the introduction pipe portion 27 and the protection pipe 32, and a valve box 35c having a plurality of communication holes 35b on a peripheral wall thereof. And the valve seat 3 provided in the valve box 35c through the spring 35d.
The check valve 35 is provided with a spherical valve 35e that is biased to come into contact with the seat surface of 5a.

When steam is supplied from the steam inlet 25, the valve 3 is resisted against the spring 35d.
5e is separated from the seat surface of the valve seat 35a, so that the steam from the steam inlet port 25 is transferred to the valve box 35.
It is introduced into the mixing chamber 21 from each communication hole 35b of c. On the other hand, with the closing of the steam amount adjusting valve 8, the steam inlet 2
When the steam supply from 5 is stopped, the spring 35d presses the valve 35e against the seat surface of the valve seat 35a so that the valve 35e contacts the back surface of the steam from the inside of the protection pipe 32 to the steam inlet 25 side. Prevent.

Next, the operation of the above configuration will be described. First, the cold water C flowing into the tank 1 from the water supply pipe 3 in FIG. 2 is sent from the circulation path 4 into the mixing chamber 21 through the water inlet 22 of the mixer 20 in FIG. 1 by the pump 5. On the other hand, the steam S is introduced from the steam pipe 9 in FIG. 2 through the steam amount adjusting valve 8 into the protection pipe 32 from the steam inlet 25 of the mixer 20 in FIG. The steam S is blown out from each of the pores of the porous member 33 into each of the mixing chambers 21 through each of the steam ejection holes 31 of the protection pipe 32, and the steam S and the water W are mixed. Then, the temperature of the water W rises,
Part of the warm water H is taken out from the take-out pipe 11 of FIG.
The surplus hot water H is collected in the tank 1. Here, when the temperature detected by the temperature sensor 6 has not reached the set temperature set by the user, the output from the controller 7 is adjusted to increase the opening degree of the steam amount adjusting valve 8,
By increasing the supply amount of the steam S, the temperature of the hot water H is controlled to be the set temperature.

In the above structure, since the temperature of the hot water H is raised to the set temperature, even if the supply amount of the steam S to the mixing chamber 21 of FIG. Since it gradually passes through the holes and is blown into the mixing chamber 21, it does not cause an increase in the vapor blowing rate, and when passing through the pores of the porous member 33, the vapor S is divided into small bubbles. Then, the steam S and the water W are brought into contact with each other in a small bubble state. Therefore, noise such as a hammer sound is reduced to reduce discomfort, and vibration due to the hammer sound is prevented from being generated, so that the circulation path 4, the hot water discharge pipe 10 and the steam amount adjusting valve 8 in FIG. It has no adverse effect. Further, since the blowing speed of the steam S becomes slower, the flow of the water W is less likely to be disturbed by the steam S, and as a result, the steam S and the water W are uniformly mixed and the hot water supply temperature is stabilized.

Further, in the above structure, since the sliding parts such as the coil springs are not used, the reliability is improved without causing damage to the sliding parts. Moreover, since the porous member 33 is protected by the protective tube 32, the reliability is further improved.

In the above embodiment, the protective tube 32 is used.
Although the steam ejection holes 31 are formed only on the peripheral wall of the cap, the steam ejection holes 31 may be provided on the cap 34 side together with the peripheral wall. In this case, the porous member 33 is provided on the inner surface side of the cap 34. Is preferred.

FIG. 3 shows another embodiment of the present invention in which the protective tube is omitted. In this embodiment, the steam blowing device 30
Includes a cylindrical porous member 33 whose both ends are open, and the entire porous member 33 is located inside the mixing chamber 21 inside the mixing pipe portion 28. One end side of the opening of the porous member 33 is attached to the peripheral surface of the check valve 35 by a plurality of screws 41, and the other end side is closed by a top plate 34A.

Also according to the embodiment of FIG. 3, the porous member 33 is used.
By the action, noise and vibration are reduced and the hot water supply temperature is stabilized.

In each of the above embodiments, the check valve 35 is provided at the connecting portion between the elbow portion 27a of the introduction pipe portion 27 and the protection pipe 32, but the check valve 35 is not always required. Absent.

[0030]

As described above, in the mixer according to the first aspect of the present invention, since the steam blowing device is composed of the porous member having the pores through which the steam can pass, noise and vibration are reduced. Also, reliability can be improved without damaging parts while stabilizing the hot water supply temperature. According to the second aspect of the present invention, which is provided with the protective tube for the porous member,
The porous member can be protected to further increase the reliability of the mixer.

[Brief description of drawings]

FIG. 1 is a vertical sectional view showing a mixer according to an embodiment of the present invention.

FIG. 2 is a piping diagram showing an automatic hot water supply system using the same mixer.

FIG. 3 is a vertical sectional view showing a mixer according to another embodiment of the present invention.

FIG. 4 is a vertical sectional view showing the previously proposed mixer.

FIG. 5 is a side view showing a conventional mixer.

[Explanation of symbols]

21 ... Mixing chamber, 22 ... Water inlet, 25 ... Steam inlet, 2
6 ... Warm water discharge port, 30 ... Steam blowing device, 31 ... Steam ejection hole, 32 ... Protective tube, 33 ... Porous member, H ... Hot water, S ...
Steam, W ... water.

Claims (2)

[Claims] 1. A water introducing port for introducing water into a mixing chamber of steam and water; and a steam blowing device which is inserted into the mixing chamber and blows out the steam introduced from the steam introducing port into the mixing chamber. And a hot water outlet for discharging hot water whose temperature has been raised, and the steam blowing device is a mixer of steam and water, comprising a porous member having pores through which steam passes. 2. A water introducing port for introducing water into a mixing chamber of steam and water; and a steam blowing device which is inserted into the mixing chamber and blows out the steam introduced from the steam introducing port into the mixing chamber. And a hot water outlet for discharging hot water whose temperature has risen, the steam blowing device has a protection tube having one end communicating with the steam inlet and having a steam ejection hole on at least a peripheral wall of the peripheral wall and the other end wall. A steam-water mixer comprising: a protective member; and a porous member that is attached to the inside of the portion of the protective tube where the steam ejection holes are provided and has pores that allow the steam to pass therethrough.