JP2676885B2 - Hot water mixing equipment - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a hot water mixing apparatus that adjusts a mixing ratio of hot water and water to obtain an optimum mixed hot water temperature.

2. Description of the Related Art Conventionally, this type of hot and cold water mixing apparatus is as shown in FIG.

In FIG. 3, reference numeral 1 denotes a hot water flow path, 2 denotes a water flow path, and an automatic pressure regulating valve 3 is provided in association with each flow path. The automatic pressure regulating valve 3 includes a hot water side valve body 4 and a hot water 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. It comprises a valve seat 7, a valve shaft 8 connecting the hot water side valve body 4 and the water side valve body 6, and a piston 9 which operates with a pressure difference between the primary pressure PH <b> 1 and the PC <b> 1 after decompression of hot water and water. Thus, even if the pressure of hot water or water changes suddenly, the automatic pressure regulating valve 3 moves at that pressure, and acts so that the secondary pressure PH2 of the hot water and water and PC2 are always kept equal. The mixing ratio of hot water and water is varied by moving the temperature control valve 12 energized by the motor 11 left and right to change the mixing temperature. Reference numeral 13 denotes a mixing section of hot water and water. After mixing, the hot water is discharged through a flow rate control opening / closing valve 14, and its temperature is detected by a thermistor 15, its flow rate is detected by a flow rate sensor 16, The controller 18 energizes the motor 11 and the flow control on-off valve 14 so as to match the above.

DISCLOSURE OF THE INVENTION Problems to be Solved by the Invention However, in the above-described configuration, the power supply to the motor is stopped and the temperature control valve 12 maintains its position during a power failure. At this time, if the supplied hot water temperature rises or the water pressure changes, the hot water discharge temperature rises, which is dangerous.

An object of the present invention is to solve the above-mentioned conventional problems, and to improve safety because the hot side valve body is almost fully closed by the biasing force of the biasing means when the supply of the driving force of the variable bias means is stopped. To do.

Means for Solving the Problems In order to solve the above problems, a hot and cold water mixing apparatus according to the present invention includes a hot water flow path and a water flow path, and a hot water valve body that changes the mixing ratio by adjusting the flow rates of the hot water flow path and the water flow path. And a water-side valve element, and the hot-water valve element and the water-side valve element are connected by a valve shaft, and the valve shaft is provided and is operated by the pressure difference between the outlet pressures of the hot-water valve element and the water-side valve element. A piston, a biasing unit that biases the valve shaft, and a variable bias unit that applies a variable bias force that opposes the force of the biasing unit, and the force of each of the variable bias unit and the biasing unit is A structure in which a pressure adjusting operation is performed based on an outlet pressure applied to the piston at a position where the pressure is balanced, and when the supply of the driving force of the variable bias means is stopped, the biasing means drives the hot side valve body to be in a substantially fully closed state. There is.

With the above configuration, when the supply of the driving force of the variable bias means is stopped, the hot side valve is almost fully closed by the urging force of the urging means.

Embodiment Hereinafter, an embodiment of the present invention will be described with reference to the drawings. FIG. 1 is a cross-sectional view of the hot and cold water mixing apparatus, and the same parts as those in FIG. 3 are denoted by the same reference numerals.

Reference numeral 19 denotes an urging unit, and 20 denotes a variable bias unit that applies a variable bias force in opposition to the force of the urging unit 19. The variable bias means 20 includes a plunger 21 made of a magnetic material,
Waterproof and insulated coil around the plunger 21
22 and the coil 22 is connected to the control means 23. The tapping temperature is detected by the temperature detecting means 24, the set temperature is set by the temperature setting means 25, and a signal is sent to the control means 23, respectively.

 Next, the operation of the configuration of the present invention will be described.

When a current is applied to the coil 22 from outside the control means 23, the plunger 21 made of a magnetic material applies a bias force to the valve shaft 8 according to Fleming's law. When the biasing force and the urging force of the urging means 19 are balanced, the automatic pressure regulating valve balances.

Therefore, the balance point of the automatic pressure regulating valve 3 can be moved by changing the current flowing through the coil 22.

For example, when the current is small, the force of the urging means 19 is stronger, so that the water-side valve body 6 opens more than the hot-water-side valve body 4, and the tapping temperature decreases.

When the current is increased, the plunger 21 is pushed out against the force of the urging means 19, so that the hot-water-side valve body 4 opens, and as a result, the hot-water tapping temperature increases.

In this way, the control means 23 adjusts the current flowing through the coil 22 by inputting the signal of the temperature detecting means 24 and the signal of the temperature setting means 25 so that the hot water discharge temperature becomes the set temperature.

Further, the operation when the power supply is stopped due to the power failure (when the driving force of the variable bias means is stopped) will be described.

When the power supply is stopped, the control means 23 cannot apply the current to the coil 22 and cannot drive the plunger 21.

Therefore, the bias force as the variable bias means cannot be applied and the temperature cannot be adjusted. At this time, urging means
The valve shaft is urged by 19 and the hot water valve body is almost fully closed, so that the hot water discharge temperature will not become higher than the set temperature even if disturbance occurs (rise of hot water supply temperature, fluctuation of water pressure, etc.).

Further, in normal use, when the water pressure changes, the automatic pressure regulating valve 3 operates as in the conventional case, and the hot water valve body 4 and the water side valve body 6 are operated.
If the pressure receiving areas of the piston 9 and the piston 9 are equalized, the secondary pressures PH2 and PC2 are kept at the balance point by the biasing means 19 and the variable bias means 20.

In order for pressure regulation to be performed accurately when the water pressure fluctuates,
As shown in the characteristics of the figure, the bias force does not change depending on the piston position, but can be changed only by the current I. That is, the bias force needs to act as a bottom-up force. As means therefor, means using Fleming's law as shown in this example and various configurations such as a linear motor can be considered.

Further, since the pressure regulating valve and the temperature regulating valve can be integrated into one, the size can be reduced.

Effects of the Invention As described above, the hot and cold water mixing apparatus of the present invention includes a hot water flow path and a water flow path, and a hot water side valve body and a water side valve body that adjust the flow rate of the hot water flow path and the water flow path to change the mixing ratio. A piston that is provided on the valve shaft while connecting the hot water valve body and the water valve body with a valve shaft, and that operates by a pressure difference between the outlet pressures of the hot water valve body and the water valve body; The piston has a biasing means for biasing the shaft and a variable biasing means for imparting a variable biasing force that opposes the force of the biasing means, and the piston is provided where the respective forces of the variable biasing means and the biasing means are balanced. The pressure adjusting operation is performed based on the outlet pressure applied to the variable bias means, and when the supply of the driving force of the variable bias means is stopped, the biasing means drives the hot water side valve body to be in a substantially fully closed state. Have an effect.

(1) As a means for ensuring safety at the time of power failure, the auxiliary power supply for power failure was required in the conventional configuration, but the auxiliary power supply is not required in the configuration of the present invention, and the hot water temperature is lowered by the biasing force of the biasing means. It's safe.

(2) When the heat source is an electric water heater or the like, there is no danger of draining the hot water that has been stored by fully closing the hot water valve in the event of a power failure.

[Brief description of the drawings]

1 is a cross-sectional view of a hot water mixing apparatus according to one embodiment of the present invention, FIG. 2 is a bias force characteristic diagram of the hot water mixing apparatus, and FIG. 3 is a conventional hot water mixing apparatus having a pressure adjusting section and a temperature adjusting section. FIG. 1 hot water flow path, 2 water flow path, 4 hot water side valve element, 6
Water side valve body, 8 ... Valve shaft, 19 ... Biasing means, 20 ... Variable bias means.

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Hiroaki Yonekubo 1006 Kadoma, Kadoma City, Osaka Prefecture Matsushita Electric Industrial Co., Ltd. (56) Reference JP-A-56-129919 (JP, A) JP-A-61 -125532 (JP, A) JP 61-41088 (JP, A) JP 1-312279 (JP, A) Actually developed 62-170878 (JP, U)

Claims (1)

(57) [Claims] 1. A hot water flow path and a water flow path, a hot water side valve body and a water side valve body that adjust a flow rate of the hot water flow path and the water flow path to change a mixing ratio, the hot water side valve body and a water side valve. A piston that is connected to the body with a valve shaft and is provided on this valve shaft, and that operates by a pressure difference between the outlet pressure of the hot water valve body and the water side valve body; and a biasing means that biases the valve shaft, A variable biasing means for applying a variable biasing force opposite to the force of the biasing means, and a pressure adjusting operation is performed based on the outlet pressure applied to the piston where the respective forces of the variable biasing means and the biasing means are balanced. A hot and cold water mixing device for performing the above-mentioned operation, and when the supply of the driving force of the variable bias means is stopped, the biasing means drives the hot water side valve element to bring it to a substantially fully closed state.