JPS6334382A - Valve gear - Google Patents

Abstract

PURPOSE:To prevent overload from being imposed in succession, by installing a stopper device, preventing a valve from being driven by overreaching a valve closing point or its fully opening point, and also a step-out type motor. CONSTITUTION:Both tappet valve bodies 28 and 29 are driven by a hot-water side motor 34 and a water side motor 35 using a stepping motor or a step-out type motor installed in the outside after being decelerated by reduction gears 36 and 37 via shafts 32 and 33. When they continue to operate even if a control system gets out of order and the hot-water side motor 34 and the water side motor 35 go beyond a microswitch operating point, a pin 64 comes into contact with an end 65 or 66 of a notch 63, stopping the motion. When the pin 64 is made contact with the end 65 or 66 and overload is imposed, it is stepped out at once whereby driving torque decreases sharply so that an output shaft is no longer rotated.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to electrically driven valve systems for controlling fluids.

2. Description of the Related Art Conventionally, there has been a hot water mixing device of this type as shown in FIG. (For example, Japanese Patent Application Laid-Open No. 61-112879) In FIG.
A hot water valve 4 is provided in the middle of each of the valves 4 and is formed into a cylindrical shape so as to be rotatable about a vertical rotation axis. The water valve 2 and the hot water valve 4 are driven by a drive unit 5 via a rotation reduction element of a motor 6. The mixed hot water is supplied through the mixed hot water flow path 7,
The mixed water temperature is detected by a temperature sensor 8. The signal from the temperature sensor 8 is sent to the control section 9, where it is compared with a set temperature, and both moving parts 5 are controlled so that the set temperature is obtained. Now, in the water valve 2 and the hot water valve 4, the rotating shafts 10 of the driving part 5 are connected to each other in an integral rotational manner, and the water valve 2 is driven by the driving part 5 to rotate in forward and reverse directions, so that the mixed hot water flows. The opening ratio of the notched opening 11 with respect to the valve seat hole 12 on the side of the passage 7 is increased or decreased.

Similarly, the hot water valve 4 is driven by the drive unit 5 to rotate in forward and reverse directions to increase or decrease the opening ratio of the notched opening 13 with respect to the valve seat hole 14 of the mixed hot water flow path 7. The drive unit 5 outputs the driving force of the motor 6 to the rotary shaft 10 via a deceleration element, and regulates the rotation direction of the water valve 2 and the hot water valve 4 so that the opening ratios of both valves do not increase or decrease at the same time. At the same time, the aperture ratio of one is increased or decreased relative to the other. This adjusts the opening ratio of both valves, and adjustably controls the ratio of water and hot water that reach the mixing vortex flow path, that is, the temperature of the mixed hot water.

Problems to be Solved by the Invention However, the above configuration has the following problems.

(1) Water valve 2 and hot water valve 4 are not equipped with a stopper that allows the valve to be driven beyond a predetermined range, so if the control system fails, there is a risk that the water valve 2 and hot water valve 4 will rotate continuously in one direction, resulting in hot water It was dangerous because water and water were supplied alternately.

(2) Since the water valve 2 and hot water valve 4 do not have a stopper or a means to detect the fully closed point or fully open point, the valves open when the pressure is low or the set temperature is close to the water temperature or hot water temperature. This caused the valve to enter a region with low valve sensitivity, and the temperature of the mixed hot water fluctuated greatly when the pressure fluctuated or when the supply water temperature or hot water temperature suddenly changed.

Also, when starting hot water supply with the valve fully closed, if there is a difference in the closing positions of water valve 2 and hot water valve 4, hot water may come out first or water may come out first, resulting in a large mixed water temperature. It fluctuated.

(3) The water valve 2 and the hot water valve 4 have a cylindrical shape, and there is a gap between them and the surrounding valve seats, making it difficult to clean water, and if used for a long period of time, water may be contained in the hot water. A lock phenomenon occurred in which the scale component precipitated and the valve stopped moving, and if an attempt was made to forcefully turn the valve, the motor 6 and drive unit 5 were damaged.

The present invention is intended to solve these conventional problems, and aims to provide a valve device which is excellent in safety and does not cause damage to data or the like even in the worst case.

Means for Solving the Problems In order to solve the above problems, the valve device of the present invention includes a valve and a stopper means for preventing the valve from being driven past the closing point or the full opening point of the valve. , and a step-out type motor whose driving force is reduced by overload as a motor for driving the valve.

According to the above-described structure, when the valve is driven beyond the fully closed point or fully open point or both, an overload is applied temporarily by the stopper means, and the motor immediately steps out and the driving force is reduced. This reduces the risk of continuous overload, preventing damage to various parts, and ensuring that the valve is fully open.

This is to ensure safety by preventing the motor from being driven beyond the fully closed point.

Embodiments Hereinafter, embodiments of the present invention will be explained based on the accompanying drawings. In FIG. 1, the hot water and water supplied through the hot water flow path 16 and the water flow path 1T enter the valve body 18, and the check valve 19.2
Pressure balance valve 21 that balances the pressure of 0, hot water and water
It then reaches the hot water side valve 22 and the water side valve 23. The hot water side valve 22 and the water side valve 23 have the same structure, and the valve holding cylinder 24.
A flat plate-shaped fixed valve body 26.2 made of ceramic is inside 25.
7 and the valve body 28.29 are housed, and the plate that serves both as a biasing force to increase water-stopping performance and as a rotation stopper also utilizes a biasing force of 30°31 to connect the fixed valve body 26.27. Valve body 28.2
9 is in close contact. The valve body 28, 29 is the valve holding cylinder 24
．． 25 with a slight gap, and the back surface is in contact with a backup ring 30, 31 made of a material with good sliding properties that receives vertical force. Valve body 28.
29 is a hot water side motor a4 using a stepping motor, which is an externally provided electric drive means and is a step-out type motor, via a shaft 32.33 having a diameter smaller than that of the valve body 28.29. and the water side motor 35, the reduction gear 36
．． It is decelerated and driven at 37.

The shaft 32.33 is sealed by an O-ring 38.39. Further, the valve position detectors 4o and 41 detect the fully open point and the fully closed point of the valve. The temperature of the mixed water is determined by thermistor 4.
2, and the flow rate of the mixed hot water is detected by a flow rate sensor 43. The mixed hot water passes through a mixed hot water flow path 44 and is supplied from a hot water supply port 45 to the target of hot water supply. In the vicinity of the hot water supply port 45, there is a device that instructs the start and stop of hot water supply, the mixed water temperature, the mixed flow rate, and the integrated value of the mixed flow rate, and also uses signals from the mixed hot water temperature, mixed flow rate, and valve position detectors 40 and 41. Setting device 4 that displays the
6 is provided. Thermistor 42, flow sensor 43
, the valve position detectors 40, 41, and the setting device 46 are transmitted to the controller 47, and the controller 7 controls the display of the hot water side motor 34, the water side motor 35, and the setting device 46.

Figure 2 shows the fixed valve bodies 26°27 of the hot water side valve 22 and the water side valve 23.
and details of the valve body 28 and 29 are shown. Fixed valve body 26.27
The valve body 28, 29 is formed into a disk shape having the same shape, and has a fan-shaped opening 48°, 49°, 50, 51. The rear surface has a groove 53 into which the tip 52 of the shaft 32.33 and the leaf spring 30.31 fit. Although the grooves of the fixed valve bodies 26 and 27 are not visible due to the drawing, they are formed similarly to the grooves 5a of the valve operating bodies 28 and 29. The fixed valve body 26.27 and the valve operating body 28.29 are.

The inner surfaces 54 and 55 are polished to the extent that they stick to each other and are configured to slide in close contact.

FIG. 3 shows details of the valve position detector 40,41.

A cam 56 is provided on the shaft 32.33, and the protrusion 5
7 contacts a microswitch 58 for detecting the fully closed point and a microswitch 59 for detecting the fully open point, electrically detects the position, and transmits a signal to the controller 47. The controller contains a microcomputer and controls the hot water side motor 34 and the water side motor 35 without using a D/A converter.

The positions of the microswitches 58 and 59 are adjusted by the fine adjustment means 60.
．． 61 allows fine adjustment.

FIG. 4 shows details of the stopper means. Valve holding cylinder 24,
A notch 63 is provided in the plug portion 62 of 25, and the shaft 32 is provided with a notch 63.
, a3 constitutes a stopper means by abutting against the ends 65, 66 of the notch 6a. If the control system malfunctions and the hot water side motor 34 or water side motor 35 continues to move even beyond the operating point of the microswitch 58,59, the pin 64 will close at the end 65 or 66 of the notch 6a.
stops moving when it comes into contact with. Since the hot water side motor 34 and the water side motor 35 are configured with stepping motors, if the pin 64 comes into contact with the end 65 or 66 and an overload is applied, it will immediately step out and the driving torque will decrease sharply, causing the output shaft to It will stop rotating. Therefore, the reduction gear a6.37
Torque is not continuously applied to the pin 64, etc., and these parts are not damaged. Even if the valve operating body 28 or 29 were to lock, torque would not continue to be applied to each part.

Next, the operation of this embodiment will be explained. When the hot water supply is normally stopped, the protrusion 57 contacts the microswitch 58 that detects the fully closed point, and the valve operating bodies 28, 29 of the hot water side valve 22 and the water side valve 23 are connected to the fixed valve body 26. 27 is closed, the flow of hot water and water is stopped, and the hot water side motor 34 and water side motor 35 are also stopped. When the mixed hot water temperature, mixed flow rate, and mixed flow rate are set using the setting device 46 and the start of hot water supply is instructed, the hot water side valve 22 and the water side valve 23 begin to open. At this time, the full closing point of the hot water side valve 22 and the water side valve 23 is.

Since the fine adjustment means 60 and 61 are adjusted so as to damage the seal between the fixed valve bodies 26 and 27 and the valve operating bodies 28 and 29, the hot water may start coming out first or the water may start coming out first. Therefore, the mixed water temperature does not fluctuate greatly during opening. The mixing flow rate is determined by comparing the signal from the flow rate sensor 43 and the set value of the setting device 46, and the mixing water temperature is determined by comparing the signal from the flow rate sensor 43 and the setting value by the setting device 46.
The set values of are compared, and the opening degrees of the hot water side valve 22 and the water side valve 23,
The flow rate ratio is adjusted by controller 47.

Regarding scale build-up during long-term use, fixed valve body 26
．． There is no scale adhesion between the valve body 27 and the valve body 28, 29 due to the close sliding movement.

Although there is a possibility that scale may be deposited between the valve operating body 28.29 and the valve holding cylinder 24.25, the O-ring 65.66 and backup ring 30.31 provided around the fixed valve body 26.27 prevent the hot water from being removed. This scale precipitation is prevented because the structure prevents water from entering. Even if a lock occurs due to scale buildup, the hot water side motor 34 and the water side motor 35 use stepping motors, which are step-out type motors, so overload will not continue. There is no damage to any parts.

During operation, when the pressure is low, when the set temperature is close to the water temperature or hot water temperature, or when the mixed flow rate is large, the protrusion 57 of the cam 56 comes into contact with the microswitch 59 that detects the fully open point, and the valve closes. Since it is prevented from entering a region with low sensitivity, the mixed water temperature will not change significantly even if the pressure fluctuates or the supply water temperature or hot water temperature changes suddenly. In addition, even if the control system malfunctions and the microswitches 58 and 59 become ineffective, the hot water side valve 22 and the water side valve 23 can be stopped by the action of the pin 64 and end portion 65, 66, which serve as stopper means. , the danger of alternate supply of hot water and water is prevented.

When the stop of hot water supply is instructed by the setting device 46, the hot water side valve 22 and the water side valve 23 are closed. At this time of closing,
The same goes for when opening, but the mixing ratio of hot water and water is maintained at an appropriate level. When closed, the fixed valve body 26,27 and the valve operating body 28,29.

The openings 48.49 and 50.51 are mutually closed, and water is cut off. The water stop property at this time is fixed valve body 26.27
The valve body 28, 29 has a flat plate shape, and its inner surface 54.
55 is polished to a flat surface and polished to the level that they stick to each other, making it extremely good and easy to manufacture.

The advantages of this embodiment are that since the motors 34 and 35 are stepping motors, digital control by a microcomputer can be easily performed without the need for a D/A converter, and that the valve is a hot water mixing valve. In particular, the stopper means can prevent the danger of hot water being supplied in the event of a failure of the control system, etc., and since the valves 22 and 23 are rotary valves, the rotation of the motor 34 and 35 can be converted into linear motion. The advantage is that it can be driven without using a mechanism and the configuration is simplified.

In the above embodiment, the valve bodies 28 and 29 are rotationally driven by the hot water side motor 34 and the water side motor 35, but they may be linearly driven or a combination of rotation and linear motion. It may be in any format. Another possible method is to drive the hot water side valve 22 and the water side valve 23 with one motor and provide a separate valve for controlling the flow rate. The motors 34, 35 may also be other step-out type motors, for example synchronous motors.

Furthermore, the present invention is not limited to hot water mixing valves, but can also be applied to a wide range of general electrically driven valves.

Effects of the Invention As described above, the valve device of the present invention provides the following effects.

(1) Even if the control system that controls the motor fails, the stopper means prevents the valve from being driven, so the flow rate does not exceed or fall below the intended flow rate, and is safe. It can be a valve device.

(2) When the motor comes into contact with the stopper means, the motor loses synchronization, so torque is not continuously applied, and damage to various parts can be avoided, and the motor itself will not burn out.

(3) Even if the valve part is locked due to scale build-up, the motor can similarly be prevented from stepping out and continuous torque being applied.

[Brief explanation of drawings]

FIG. 1 is a partially cutaway sectional view of a valve device according to an embodiment of the present invention, FIG. 2 is a perspective view showing details of the valve portion of the device, and FIG.
4 is a perspective view showing a stopper means of the same device, and FIG. 5 is a partially cutaway sectional view showing a conventional valve device. 22... Hot water side valve (valve), 23... Water side valve (valve). 34...Hot water side motor (motor), 35...
... Water side motor (motor), 64 ... Pin (stopper means), 65.66 ... End (stopper means). Name of agent: Patent attorney Toshio Nakao and 1 other person 2nd
Figure 3 ^2 Figure 4

Claims (4)

[Claims] (1) A valve, a stopper means for preventing the valve from being driven past the closing point or the fully open point, or both, and a step-out type that reduces the driving force due to an overload that drives the valve. A valve device equipped with a motor. (2) The valve device according to claim 1, wherein the motor is a stepping motor. (3) The valve device according to claim 1 or 2, wherein the valve is a hot water mixing valve. (4) The valve device according to claim 1 or 2, wherein the valve is a rotary valve.