JP2578173B2 - Hot water mixing equipment - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a hot and cold water mixing apparatus for mixing hot water and water to obtain an appropriate temperature.

2. Description of the Related Art Conventionally, there has been a water / water mixing apparatus of this kind as shown in FIG. 5 (for example, Japanese Utility Model Laid-Open No. 55-59223). Fifth
In the figure, a hot water inlet 41, a water inlet 42 and a mixed hot water outlet 43
A hot water side valve body 45, a hot water side valve seat 46, a water side valve body 47, and a water side valve seat 48 are provided inside a valve frame body 44 having The hot water side valve element 45 and the water side valve element 47 are mounted on a shaft 49 and driven by a motor 52 via a linear motion converter 50 and a gear 51 provided outside. Near the outlet 43 of the mixed hot water, a temperature detector 53 for detecting the temperature of the mixed hot water is provided.
The controller 55 compares the mixed hot water temperature set value set by the mixed hot water temperature setter 54 with the mixed hot water temperature value detected by the temperature detector 53, and controls the motor 52. Further, one end of a mixed hot water pipe 56 is connected to the outlet 43 of the mixed hot water, and a faucet 57 is provided at the other end. Then, when the faucet 57 is opened and the mixed hot water temperature setting device 54 sets the mixed hot water temperature, the controller 55 compares the value of the temperature detector 53 with the set value of the mixed hot water temperature as a signal, and calculates the temperature deviation between the two. The drive of the motor 52 is controlled so as to eliminate the gap, and the gap between the hot water side valve body 45 and the hot water side valve seat 46 and the gap between the water side valve body 47 and the water side valve seat 48 are adjusted.

However, in the above-described structure, the malfunction of the controller 55 or the motor 52 during use, or the temperature detector
When the hot water side valve body 45 is fully opened and the water side valve body 47 is driven to fully close regardless of the mixed hot water temperature set value due to a defect of the hot water 53, only high temperature hot water flows out of the faucet 57 of the mixed hot water pipe 56. As a result, there is a problem that a danger such as a burn occurs.

An object of the present invention is to solve the above-mentioned problem, and to provide a highly safe hot-water mixing apparatus that does not cause danger such as burns as a structure in which only high-temperature hot water does not flow even if a malfunction or the like occurs. It is assumed that.

Means for Solving the Problems In order to solve the above problems, the hot and cold water mixing device of the present invention is
A hot water flow path connected to the hot water supply path, a water flow path connected to the water supply path, a hot water valve seat and a hot water valve body facing the hot water flow path, and water facing the water flow path. A side valve seat and a water-side valve body, a mixing channel in which hot water and water flow together, a hot water temperature detector provided in the mixing channel, and an opening degree of the hot-side valve seat and the hot-side valve body And a shaft and a drive motor for adjusting the degree of opening between the water-side valve seat and the water-side valve body, and the water-side valve body is provided with a cutout portion such as a flat surface or a convex portion or a concave portion in the water-side valve seat. When the hot water valve seat and the hot water valve body are in the open state and the water water valve seat and the water water valve body come into contact with each other and become fully closed, the water water valve seat and the water A water passage portion through which a certain amount of water flows is formed between the side valve body.

Operation In the above configuration, if the controller, hot water temperature detector, etc. are normal, the amount of water and the amount of hot water are controlled in accordance with the temperature set value, and the hot water is discharged as the mixed hot water temperature according to the set value, and the control is erroneously operated in the event of an error. Even when the hot water side valve element is fully opened and the water side valve element is in the fully closed state, a certain amount of water flows from the water passage at the contact portion between the water side valve seat and the water side valve element. Mixing with hot water, as a result, even if a malfunction occurs, hot water alone is not discharged, and the maximum value of the hot water temperature is lowered, so that danger such as burns can be prevented.

Embodiment Hereinafter, an embodiment of the present invention will be described with reference to the drawings.

FIG. 1 is a longitudinal sectional view showing a hot water mixing apparatus according to an embodiment of the present invention, FIGS. 2 (a) and 2 (b) show a water side valve element of the hot water mixing apparatus, and FIG. (B) is a side view, and FIG. 3 is a configuration diagram showing a hot water supply device using the hot water mixing device.
In the hot water supply apparatus shown in FIG. 3, the water supplied from the water pipe 1 is depressurized by the pressure reducing check valve 2, sent to the heat source unit 4 by the water supply pipe 3a, and heated by the heat source unit 4 to make hot water. Hot water is led to a hot water mixing device 6 through a hot water supply pipe 5. On the other hand, water is guided from the branch water supply pipe 3b branched from the water supply pipe 3a to the hot water mixing device 6 after the pressure reducing check valve 2, and the hot water and the water are mixed by the hot water mixing device 6. The mixed hot water passes through the mixing hot water supply pipe 7 and the taps 8a, 8 at the terminals.
lead to b. A temperature setting device 9 is provided in the vicinity of the faucet 8a.
It is configured to tell.

The hot water mixing device 6 has a hot water side flow path 12 at one end inside the valve frame 11, a water side flow path 13 at the other end, a mixing flow path 14 near the center, and a hot water side. A hot water side valve seat 15 is provided downstream of the flow path 12, and a water side valve seat 16 is provided downstream of the water side flow path 13, and the mixing is performed between the hot side valve seat 15 and the water side valve seat 16. Channel
A hot / water mixing chamber 17 leading to 14 is formed. A hot-water-side valve element 18 is disposed on the hot-water-side valve seat 15 such that a sealing surface 18a of the hot-water-side valve element 18 is urged by a hot-water-side spring 19 to abut thereon. The water-side valve body 20 is biased by a water-side spring 22 between the limb 21 and the water-side valve body 20.
Positioning is performed so that a is fully opened when a contacts the hot water side valve seat 15. The hot water side valve element 18 and the water side valve element 20 are both shafts.
The shaft 23 is driven by a rotational motion of a drive motor 24 via a cam 25, is converted into a linear motion by a screw 26, and moves in a thrust direction. When the shaft 23 moves in the direction of arrow M, the hot water side valve body 18 is pushed by the tip of the shaft 23 and moves in the opening direction, and at the same time, the water side valve body 20 moves together with the shaft 23 in the closing direction. The mixing channel 14 is provided with a thermistor 27 for detecting the temperature of the mixed hot water. 9 is a temperature setting device and 10 is a controller. Also, the hot water supply pipe 5 is provided in the hot water flow path 12, the branch water supply pipe 3b is provided in the water flow path 13, and the mixed hot water supply pipe 7 is provided in the mixing flow path 14.
Are connected respectively. Hot water flowing from the hot-water-side flow path 12 and water flowing from the water-side flow path 13 are mixed in the hot-water mixing chamber 17, flow as mixed hot water into the mixing flow path 14, and the temperature is detected by the thermistor 27. The temperature set by the setting device 9 is compared with the controller 10, and the motor 24 is driven to move the hot water side valve body 18 and the water side valve body 20 so that they match to control the hot water side flow rate and the water side flow rate. I do. 28 is a hot water side micro switch, hot water side valve element 18
Is activated when it contacts the hot water side valve seat 15, and 29 is a water side micro switch, which is activated when the water side valve body 20 comes into contact with the water side valve seat 16.

As shown in FIG. 2, the water-side valve body 20 has a substantially truncated conical side surface, and the large-diameter end has a spring seat 30 fitted with the water-side spring 22, and the small-diameter end 31. Is formed so as to be in contact with the limb 21, and on the inclined surface of the truncated cone, a contact surface 33 having a predetermined width in a cross shape around the axis of the shaft hole 32 is in close contact with the curved surface of the water-side valve seat 16. And a portion between adjacent contact surfaces 33 is formed on a flat surface 34. Therefore, the water side valve element 20
Abuts against the water-side valve seat 16, only the contact surface 33 of the water-side valve body 20 is in close contact with the water-side valve seat 16, and the flat surface 34 is the water-side valve seat 16.
The water-side valve seat 16 and the water-side valve body 20 are not completely closed.

In the above hot water mixing apparatus 6, when a predetermined temperature is set by the temperature setting device 9 and the faucet 8a or 8b is opened, the hot water flow path 12
The hot water and the water flow into the water side flow path 13 and the mixed hot water temperature detected by the thermistor 27 and the mixed hot water temperature signal set by the temperature setting device 9 are compared by the controller 10 until the mixing ratio at which the deviation disappears. The hot-water-side valve element 18 and the water-side valve element 20 are drive-adjusted, and hot water is discharged from the faucets 8a, 8b as hot water having a set predetermined temperature. In the unlikely event that an abnormality occurs in the thermistor 27, the controller 10, the motor 24, or the like, it is driven more than necessary, the hot water side valve element 18 is fully opened, and the water side valve element
Even if 20 moves to the fully closed state, the water side valve
Has a flat surface 34, so that four gap-like water passage portions 35
Is formed, so that the flow rate of the water side flow path 13 does not become zero,
Dimensionally stable water passage formed by flat surface 34 and water-side valve seat 16
The amount of water flows according to the area of 35. Since a plurality of flat surfaces 34 are provided, the flow to the mixing channel 14 is substantially uniform over the entire circumference, and the mixing characteristics are good. Therefore, it is possible to maintain a certain mixing ratio and prevent tapping of hot water only, that is, hot tapping, thereby preventing danger such as burns.

In this embodiment, the water-side valve body is provided with a cut-out portion such as a plane as a means for forming the water passage portion. However, the same applies to a structure in which the water-side valve seat has a partial convex portion or a concave portion. The effect of is demonstrated.

Next, as an example, a general petroleum boiler is used as the heat source unit 4, and tapping temperature characteristics when an abnormality occurs are shown in FIG. 4 in relation to the flow rate and tapping temperature. In this embodiment, I is II
Fig. 5 shows the case of the conventional hot and cold water mixing apparatus shown in Fig. 5, where A is a region where heat source heating is ON and OFF, and B is a region where the heat source is continuously heated. As is apparent from FIG. 4, the present embodiment does not discharge hot water.

Effect of the Invention As described above, the hot and cold water mixing device of the present invention, even if any malfunction occurs due to the occurrence of abnormalities in the thermistor, controller, motor, etc. during use, without hot water tapping, There is no danger of burns, and it is extremely safe.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view showing a hot water mixing apparatus according to one embodiment of the present invention, and FIGS. 2 (a) and 2 (b) show a water-side valve element of the hot water mixing apparatus, and FIG. ) Is a side view, FIG. 3 is a configuration diagram of a hot water supply device using the hot water mixing device, FIG. 4 is a tap water temperature characteristic diagram when the hot water mixing device is abnormal, and FIG. 5 is a schematic diagram of a conventional hot water mixing device. It is sectional drawing. 3b: Branch water supply pipe (water supply path), 5: Hot water supply pipe (hot water supply path), 6: Hot water mixing device, 12: Hot water side flow path, 13: Water side flow path, 14: Mixing Flow path, 15: Hot water side valve seat, 16: Water side valve seat, 18: Hot water side valve element, 20: Water side valve element, 23: Shaft, 24
…… Drive motor, 27 …… Thermistor (hot water temperature detector), 35
…… Waterway section.

Continuation of the front page (72) Inventor Tetsuya Ueda 1006 Kazuma Kadoma, Kadoma, Osaka Pref. Matsushita Electric Industrial Co., Ltd. , U)

Claims (1)

(57) [Claims] 1. A hot water side flow path connected to a hot water supply path, a water side flow path connected to a water supply path, a hot water side valve seat and a hot side valve body facing the hot water side flow path, and a water side flow. A water-side valve seat and a water-side valve body facing the path, a mixing flow path in which hot water and water merge and flow, a hot water temperature detector provided in the mixing flow path; and the hot-water valve seat and the hot-water valve A shaft and a drive motor for adjusting the degree of opening with the body and the degree of opening between the water-side valve seat and the water-side valve body; Or provide a recess,
When the hot-side valve seat and the hot-side valve body are in the open state, and when the water-side valve seat and the water-side valve body come into contact with each other and become fully closed, the water-side valve seat and the water-side A hot and cold water mixing device having a water passage portion through which a predetermined amount of water flows between the valve body and the valve body.