JP2827685B2 - Hot water mixing equipment - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a hot water mixing apparatus for controlling the flow rates of hot water and water.

[0002]

2. Description of the Related Art FIG. 4 shows an example in which this type of flow control device is conventionally applied to a hot and cold water mixing device.
(For example, JP-A-1-313279). In FIG. 4, 1 is a hot water flow path, 2 is a water flow path, and an automatic pressure regulating valve 3 is provided in connection with each flow path. The automatic pressure regulating valve 3 includes a hot water side valve body 4 and a hot side valve seat 5 for reducing the primary pressure PH1 of the hot water flow path 1, a water side valve body 6 for reducing the primary pressure PC1 of the water flow path 2, and a water side. A valve seat 7, a valve shaft 8 connecting the hot water side valve element 4 and the water side valve element 6, and a primary pressure P of hot water and water provided in a cylinder 9.
H1. The automatic pressure regulating valve 3 is moved by the pressure of the hot water or the water even if the pressure of the hot water or the water suddenly changes, and the secondary pressure PH2 of the hot water and the water of the PC2
And always keep the same. In addition, the valve shaft 8
Is provided at one end thereof, and the bias means 10 is provided so as to sandwich the bobbin 11 connected to the end of the valve shaft 8 and the coil 12 wound on the bobbin 11 and insulated. The coil 12 is connected to a control means 18 via a flexible portion 14.

When a current flows from the control means 18 to the coil 12, the current crosses the magnetic field generated by the permanent magnet 13, so that a bias force is applied to the valve shaft 8 by Fleming's law. For this reason, the automatic pressure adjustment point is shifted by the amount of the bias force. For example, the secondary pressure PH2 and the PC2 of hot water and water are constantly adjusted at a point of 2: 1. As a result, the tapping temperature becomes high. . Thus, the temperature of the mixed hot water is changed by changing the current to the coil 12. Reference numeral 19 denotes a mixing section of hot water and water. After mixing, the hot water is discharged through a flow rate control opening / closing valve 20, and its temperature is detected by a mixed hot water temperature detecting means (for example, a thermistor) 15 and its flow rate is detected by a flow rate detecting means 16 The control means 18 biases the bias means 10 and the flow rate control on / off valve driving means 21 to adjust the temperature so as to match the value of the setting means 17.

[0004]

However, in the above configuration, the ratio between the displacement amount of the valve body and the flow rate (hereinafter referred to as valve sensitivity) is equal between the hot-side valve body and the water-side valve body. When hot water is supplied to the hot water side when the temperature of the hot water is high, hunting may be caused by hot water temperature control. This is because under the above conditions, the flow rate of the hot water must be minutely controlled, making it difficult to stably adjust the hot water temperature, and making the shower uncomfortable due to fluctuations in the hot water temperature during use. was there.

The present invention solves the above-mentioned problems of the prior art, and aims to stabilize the temperature of mixed hot water.

[0006]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, a hot water mixing apparatus according to the present invention is characterized in that a water valve body for adjusting a water flow rate and a change rate of the flow rate with respect to a displacement amount of the valve body are the water valve body. It is provided with a smaller hot water valve body, a valve shaft for integrally connecting the two valve bodies, and a variable operating force generating means for operating the both valve bodies.

[0007]

With the above arrangement, the valve shaft is operated by the variable operating force generating means to move both the hot and cold valve bodies to adjust the mixing ratio.

[0008]

An embodiment of the present invention will be described below with reference to the drawings. In FIG. 1, the mixing valve main body 22 has a hot water flow path 23 and a water flow path 24, a variable operation force generating means 25 is provided on the water flow path 24 side, and has an iron core 26 and a coil 27. It is electrically connected to hot water supply controller 28.
The lower end of the iron core 26 is in contact with the upper end of a valve shaft 29, and a water valve body 30 and a hot water valve body 31 are fixed to the valve shaft 29, and the valve shaft 2
Moves together with 9. The water valve body 30 and the hot water valve body 31 are
And the hot water valve port 33 respectively to adjust the flow rates of hot water and water. The elevation angle θh of the valve of the hot water valve body 31 is smaller than the elevation angle θw of the water valve body 30. Since the valve diameter is almost equal between the hot water side and the water side, the valve sensitivity of the hot water side valve body is lower. Mixing valve body 22
Is provided with a cylinder 34 having substantially the same cross-sectional area as the water valve port 32 and the hot water valve port 33. I have. Reference numeral 36 denotes a main spring which acts on the valve shaft 29 in the upward direction in the figure. Water valve body 30 and hot water valve body 31
There are variable valve bodies 39 and 40 supported by springs 37 and 38 on the downstream side to form a variable throttle. Variable valve element 3
The water and hot water that have passed through 9 and 40 are mixed by a mixing section 41, the temperature of the hot water is detected by a temperature detector 42, and the signal is calculated by a hot water supply controller 28.

Next, the operation will be described. When the current is increased from the hot water supply controller 28 to the coil 27 while the hot water is flowing, a downward force is generated in the iron core 26 and the valve shaft 29 is urged downward against the force of the main spring 36. I do. As a result, the water side is closed and the hot water side is opened, and the outlet pressure of the hot water valve element 31 and the outlet pressure of the water valve element 30 change respectively, and the pressure acts on the hot water valve element 31 and the water valve element 30 to balance them. As a result, the temperature of the mixed hot water increases. When the current of the coil 27 is decreased, the water side is opened and the hot water side is closed, and as a result, the temperature of the mixed hot water is lowered. The temperature of the mixed hot water is detected by the temperature detector 42 and calculated by the hot water supply controller 28 to control the current to the coil 27. In this way, the temperature of the mixed water is kept constant.

[0010] The water temperature varies depending on the season, and the mixing ratio of the hot water and the water varies depending on the temperature of the hot water supplied by the heat source or the selection of the hot water temperature set by the user. In summer, when the water temperature and the supply water temperature are high and the set water temperature is low, the ratio of the water is low, so the flow rate of the water passing through the hot water valve body 31 is small, and the thermal energy of the water is large, so there is a slight difference in the ratio. The temperature of the mixed water changes. In the present embodiment, the hot water valve body 31
Is smaller than the water valve body 30, the hunting of the control does not occur even when the valve sensitivity is low and the flow rate of the hot water is small, and the temperature of the mixed hot water is accurately maintained equal to the set temperature. The angle on the hot water valve opening 33 side may be changed without changing the elevation angle of the hot water valve body 31.

FIG. 2 shows another embodiment of the present invention in which the elevation angle of the hot water valve body 31a is made non-linear, and the valve element is moved from two elevation angles as indicated by the elevation angles θh1 and θh2. It is configured. The elevation angle θh1 is opposite to the hot water valve opening 32 when the opening degree of the hot water valve element 31a is large, and the opening area thereof is large. . That is, both the effect of reducing the pressure loss and the effect of the adjustability are enhanced. A similar effect can be achieved by configuring the valve body with a smooth curve other than that shown in FIG.

FIG. 3 shows another embodiment of the present invention, in which a hot-water valve element is divided into 31b and 31c. Valve elements having different elevation angles are combined and operate in the same manner as in FIG. It is easy to make.

[0013]

As described above, according to the apparatus for mixing hot and cold water of the present invention, the following effects can be obtained.

(1) A water valve body for adjusting the water flow rate, a hot water valve body whose flow rate change ratio is smaller than the water valve body with respect to the displacement amount of the valve body, a valve shaft for integrally connecting both valve bodies, Since the variable operating force generating means for operating the valve element is provided, even when the flow rate of the hot water is small, the adjustability of the flow rate of the hot water is good and the temperature of the mixed hot water can be stabilized.

(2) There is no need to lower the control gain, and control responsiveness does not deteriorate.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view of a hot water mixing apparatus according to an embodiment of the present invention.

FIG. 2 is a sectional view of a main part showing another embodiment of the hot and cold water mixing apparatus.

FIG. 3 is a sectional view of a main part showing another embodiment of the hot and cold water mixing apparatus.

FIG. 4 is a cross-sectional view of a conventional flow control device.

[Explanation of symbols]

 25 Variable operating force generating means 29 Valve shaft 30 Water valve element 31 Hot water valve element

──────────────────────────────────────────────────の Continued on the front page (72) Inventor Bunichi Shiba 1006 Kazuma Kadoma, Osaka Prefecture Inside Matsushita Electric Industrial Co., Ltd. In-company (58) Field surveyed (Int.Cl. ⁶ , DB name) F16K 31/00-31/11 F16K 11/00-11/24 F24D 17/00

Claims (4)

(57) [Claims] A water valve body for adjusting a water flow rate, a hot water valve body having a flow rate change ratio smaller than the water valve body with respect to a displacement amount of the valve body, and a valve shaft connecting the both valve bodies together, A hot and cold water mixing apparatus comprising: a variable operating force generating means for operating the two valve bodies. 2. The hot and cold water mixing apparatus according to claim 1, wherein an elevation angle of the hot water valve body is smaller than an elevation angle of the water valve body. 3. The hot water mixing device according to claim 2, wherein the elevation angle of the hot water valve element changes nonlinearly. 4. The hot and cold water mixing device according to claim 2, wherein the hot water valve body is constituted by a plurality of parts having different elevation angles.