JP4154709B2 - Electric hot water mixing valve - Google Patents

Description

[0001]
[Industrial application fields]
The present invention mixes hot water heated by a heating device such as electricity, oil, gas, etc. with tap water by a mixing valve to control the hot water at a predetermined temperature, and this hot water is consumed by a consuming unit such as a bathtub or currant. In particular, the present invention relates to an electric hot and cold water mixing valve in which temperature control of the hot water is mainly performed electrically.
[0002]
[Prior art]
A conventional electric hot and cold water mixing valve is shown in FIG.
Reference numeral 1 denotes a valve body having a flow passage 1A drilled in the vertical direction. A first valve hole 2A connected to the tap water channel 2 is opened on the left side above the flow passage 1A, and the first valve hole 2A. A second valve hole 3A that is continuous with the high-temperature water channel 3 opens toward the flow path 1A on the right side of the lower side.
According to the above, tap water flows into the flow path 1A from the first valve hole 2A, and high-temperature water flows into the flow path 1A from the second valve hole 3A. The channel 1A on the downstream side of the hole 3A is a mixed channel 4 in which tap water and high-temperature water are mixed and flow down.
Reference numeral 5 denotes a cylindrical valve body. The upper end 5A of the valve body 5 controls the opening degree of the first valve hole 2A with respect to the flow path 1A, and the lower end 5B of the valve body 5 is the flow path 1A of the second valve hole 3A. Controls the opening relative to.
Then, when the valve body 5 moves upward in FIG. 2, the opening of the first valve hole 2A is reduced by the upper end 5A, the amount flowing into the tap water flow path 1A is reduced, and the second valve hole 3A. Is increased by the lower end 5B, and the amount flowing into the high-temperature water flow path 1A is increased.
On the other hand, when the valve body 5 moves downward in FIG. 2, the opening degree of the first valve hole 2A is increased by the upper end 5A to increase the amount flowing into the tap water flow path 1A and the second valve hole. The opening degree of 3A is decreased by the lower end 5B, and the amount flowing into the high-temperature water flow path 1A is decreased.
6 is a wax member disposed in the mixed hot water passage 4 including the flow path 1A. The wax member 6 senses the temperature of the hot water flowing in the mixed hot water channel 4 and the output rod 6A expands and contracts in the vertical direction in the figure. The movement of the output rod 6A is transmitted to the valve body 5.
Reference numeral 7 denotes a motor disposed on the upper portion of the valve body 1. The rotation of the motor 7 is decelerated by a speed reducer, and the output rod 7A is moved in the vertical direction in the figure, and the movement of the output rod 7A is transmitted to the valve body 5. Is done.
According to the above, the opening degree control of the valve body 5 with respect to the first valve hole 2A and the second valve hole 3A is first performed by displacing the output rod 7A according to the current value input to the motor 7, Second, the wax member 6 senses the temperature of the hot water flowing through the mixed hot water passage 4 and the output rod 6A is displaced, and this displacement is transmitted to the valve body 5. Accordingly, the temperature of the hot water flowing through the mixed hot water passage 4 is corrected to a predetermined temperature.
[0003]
[Problems to be solved by the invention]
According to the conventional electric hot / cold water mixing valve, it is difficult for the wax member 6 to stably and accurately sense the temperature of the hot water flowing in the mixed hot water passage 4.
That is, the wax member 6 needs to output the output signal of the wax member 6 to the valve body 5 via the output rod 6A. According to this, the wax member 6 is preferably disposed in the vicinity of the valve body 5. It is.
On the other hand, the tap water controlled by the valve body 5 and flowing into the mixed hot water passage 4 from the first valve hole 2A and the high-temperature water flowing into the mixed hot water passage 4 from the second valve hole 3A are in the vicinity of the valve body 5 ( In other words, in the vicinity of the first valve hole 2A and the second valve hole 3A), the mixing of tap water and high-temperature water is in a state where the mixing is insufficient, and when the wax member 6 senses the temperature of the tap water, If the temperature of the hot water flowing in the hot water channel 4 is detected to be lower, and the wax member 6 detects the temperature of the hot water, the temperature of the hot water flowing in the mixed hot water channel 4 is detected to be higher.
In order to solve the above problem, it is considered that the wax member 6 is separated from the valve body 5, but according to this, the total length of the wax member 6 including the output rod 6 </ b> A becomes long, and the wax is connected when connected to the valve body 5. It is necessary to increase the rigidity of the member 6, and it is also necessary to newly manufacture the wax member 6 based on a special specification. Since the standard wax member cannot be used, the component cost is significantly increased.
In addition, it is considered to provide a thermistor that senses the temperature in the hot water channel 4 in the mixed hot water channel 4, outputs the temperature state to the motor 7, and corrects the opening degree of the valve body 5. Since the temperature state in the mixed hot water passage 4 is not uniform, it is still difficult to accurately correct the opening degree of the valve body 5 even if the temperature is detected.
[0004]
The present invention has been made in view of the above problems, and a main object of the present invention is to provide an electric hot and cold water mixing valve capable of controlling the high temperature of hot water flowing through the mixed hot water passage 4 extremely accurately and stably.
[0005]
[Means for solving the problems]
In order to achieve the above object, the electric hot / cold water mixing valve according to the present invention controls the hot water channel and the opening of the tap water channel by a valve body driven by the output rod of the motor and the output rod of the wax member,
A valve body that supplies hot water of a predetermined temperature toward the mixed hot water path;
A flow rate detection tube including a flow sensor that detects and outputs the flow rate of the hot water flowing in the flow path;
It provided a temperature sensing tube body comprising a thermistor which detects and outputs the temperature of the hot water flowing in the flow path, the individually
The mixed hot water passage of the valve main body, the flow passage of the flow rate detection tube body, and the flow passage of the temperature detection tube body are connected and arranged in a straight line from upstream to downstream in the fluid flow direction, and the flow rate detection tube The body flow path is characterized in that a plurality of spiral walls are disposed in the upstream flow path, and the flow sensor is disposed in the flow path downstream of the spiral wall.
[0006]
[Action]
Openings of the high temperature water channel and the tap water channel are controlled by a valve body that is operated in combination by an output rod of the motor and the wax member, and the mixed hot water is supplied to the mixed hot water channel. In the flow path of the flow rate detection tube, the mixed hot water flowing in the mixed hot water passage is first stirred by a plurality of spiral walls to form a swirl flow, and secondly, the flow sensor is swirled by the swirl flow stirred in the above. The hot water is further stirred and the hot water and the tap water are sufficiently mixed, and the hot water temperature is detected by a thermistor in the temperature detection tube and output.
Moreover, the mixed hot water passage of the valve body, the flow passage of the flow rate detection tube body, and the flow passage of the temperature detection tube body are arranged in a straight line, and there is little pressure loss of hot water flowing through the flow passage, and the temperature gradient in the flow passage is reduced. Small deterrence.
[0007]
【Example】
An embodiment of the electric hot / cold water mixing valve according to the present invention will be described below with reference to FIG.
The electric hot / cold water mixing valve has the same structure as that shown in FIG. 2, and a flow path 1A is formed in the valve body 1 in the vertical direction, and a first valve hole 2A connected to the tap water channel 2 on the upper left side thereof. The second valve hole 3A connected to the high-temperature water channel 3 is opened on the right side below, and the mixed hot water channel 4 is opened downward from the second valve hole 3A.
[0008]
Reference numeral 10 denotes a flow rate detection tube body that is formed by penetrating a flow path 11 in the vertical direction. A plurality of spiral walls 12 are disposed upstream of the flow path 11 and the flow path 11 on the downstream side of the spiral wall 12 is provided. A flow sensor 13 is arranged. In the flow sensor 13, a plurality of blades 13B are attached to the rotating shaft 13A, a magnet 13K is disposed on the outer periphery of the blade 13B, and a hall element 13D is disposed on the flow rate detection tube 10 facing the magnet.
According to the above, when the fluid flows toward the flow channel 11 from top to bottom, the spiral wall 12 converts the flow of fluid flowing through the channel 11 into the swirl flow, thereby wings 13B rotary shaft The rotation is based on 13A, and this rotation is detected and output from the magnet 13K by the Hall element 13D.
[0009]
Reference numeral 20 denotes a temperature detection tube body that is formed by penetrating the flow path 21 in the vertical direction. The tip of the thermistor 22 is opened toward the flow path 21, and the temperature of the fluid flowing in the flow path 21 is It is detected and output by the thermistor 22.
[0010]
And according to the electric hot and cold water mixing valve according to the present invention, the upper part of the flow path 11 of the flow rate detection tube body 10 is connected to the mixed hot water path 4 opened at the lower end of the valve body 1, and the temperature is set below the flow path 11. The upstream of the detection tube 20 is connected.
In this example, the lower part of the mixed hot water passage 4 and the upper part of the flow path 11 are connected by a cylindrical joint member 40 having a smaller diameter than the flow path, and the flow path 21 is inserted and connected below the flow path 11.
What is important here is that, firstly, in the fluid flow direction, from the upstream side toward the downstream side, the mixed hot water path of the valve body 1, the flow path 11 of the flow rate detection tube 10, and the flow path of the temperature detection tube 20 21. Secondly, the mixed hot water path 4 of the valve body 1, the flow path 11 of the flow rate detection pipe body 10, and the flow path 21 of the temperature detection pipe body 20 are in a straight line. Is to be placed.
[0011]
Next, the operation will be described.
When a drive signal is input to the motor 7, the motor 7 operates according to the drive signal to operate the valve body 5 via the output rod 7A, and from the tap water channel 2 according to the opening degree of the first valve hole 2A. Tap water is supplied into the flow path 1A and high temperature water is supplied from the high temperature water path 3 into the flow path 1A according to the opening of the second valve hole 3A.
These tap water and high-temperature water are mixed in the mixed hot water channel 4 and controlled to warm water, the wax member 6 operates according to the temperature of the warm water, and the opening degree of the valve body 5 is controlled to the temperature via the output rod 6A. It is corrected. (This action is the same as before)
[0012]
The hot water in the mixed hot water passage 4 of the valve body 1 flows into the flow path 11 of the flow rate detection tube 10 and flows downward from above, and at this time, the hot water is swirled by the spiral wall 12, The swirl flow rotates the blade 13B as the flow sensor 13, and a flow rate signal is output from the Hall element 13D to the outside.
Such a flow rate signal is used in the control of hot water supply to a bath or hot water supply to a currant.
[0013]
Next, the hot water in the flow path 11 flows down in the flow path 21 of the temperature detection tube 20 , and this hot water is detected by the thermistor 22 and output.
[0014]
Here, when attention is paid to the hot water flowing into the flow path 21 of the temperature detection tube 20, the hot water in which the mixing of the hot water and the tap water is insufficient and non-uniform in the mixed hot water passage 4 of the valve body 1 is a homogeneous hot water are thoroughly mixed in the flow test Dekantai 10..
That is, when the hot water flows down the flow path 11 of the flow rate detection tube 10, the hot water is swirled by the spiral wall 12 on the upstream side, and then the warm water is stirred on the downstream side by the swirl flow. The hot water is further agitated by the rotation of the blade 13B, and is sufficiently agitated in two stages by these , so that it is sufficiently mixed to become uniform warm water.
Then, the uniformly mixed warm water flows into the flow path 21 of the temperature detection tube body 20, and the temperature of the warm water is detected by the thermistor 22, so that the temperature of the warm water formed in the electric mixing valve is increased. Can be detected very accurately.
Then, when this accurate temperature signal is fed back from the thermistor 22 to the motor 7, the valve body 5 can perform an appropriate opening correction according to the hot water temperature, and is thus controlled to a predetermined temperature. The hot water can be supplied accurately and stably.
[0015]
Further, according to the fact that the mixed hot water path 4 (flow path 1A) of the valve body 1, the flow path 11 of the flow rate detection tube body 10, and the flow path 21 of the temperature detection tube body 20 are arranged in a straight line, And the temperature gradient can be reduced, which is suitable as a hot and cold mixing valve.
[0016]
In addition, the electric hot / cold water mixing valve is prepared individually in advance by a valve body 1 having a valve body 5, a flow rate detection pipe body 10 having a spiral wall 12 and a flow sensor 13, and a temperature detection pipe body 20 having a thermistor 22. it is, if then possibly formed integrally connected at one in which could greatly improve the wearability and maintenance for hot-water supply system in a bath automatic water heater, or generally common water heater kitchen or the like used.
[0017]
【The invention's effect】
As described above, according to the electric hot / cold water mixing valve according to the present invention, the valve body 5 driven by the output rod 7A of the motor 7 and the output rod 6A of the wax member 6 through the high temperature water channel 3 and the opening of the tap water channel 2. Controlled by
A valve body 1 for supplying hot water of a predetermined temperature toward the mixed hot water passage 4 ;
A flow rate detection tube 10 comprising a flow sensor 13 for detecting and outputting the flow rate of hot water flowing in the flow path 11;
Provided a temperature detecting tube 20 provided with a thermistor 22 which detects and outputs the temperature of the hot water flowing through the flow path 21, the individual,
A mixed hot water passage 4 of the valve body, the flow passage 11 of the flow rate detecting pipe body 10, a flow path 21 of the temperature detecting tube 20, connects disposed on a straight line toward the downstream than upstream in the flow direction of the fluid In addition, in the flow path 11 of the flow rate detection tube body, a plurality of spiral walls 12 are arranged in the flow path 11 on the upstream side, and the flow sensor is arranged in the flow path 11 on the downstream side of the spiral wall 12. The temperature of the hot water flowing in the hot water mixing valve can be detected stably and accurately by the thermistor, and this enables accurate temperature correction to the valve body by the motor, so that the predetermined hot water is more stable and accurate than the hot water mixing valve. Can supply.
In addition, the hot and cold water mixing valve is provided with a valve body 1 having a valve body 5, a flow rate detection tube 10 having a spiral wall 12 and a flow sensor 13, and a temperature detection body 20 having a thermistor 22, and they Ru can greatly improve the wearability and maintenance of the hot-water supply system because it is arranged integrally connected. Furthermore, since the flow paths of the valve main body, the flow rate detection tube body, and the temperature detection tube body are arranged in a straight line, the pressure loss and the temperature gradient can be reduced, which is suitable as a hot water mixing valve.
[Brief description of the drawings]
FIG. 1 is a longitudinal sectional view showing an embodiment of an electric hot and cold water mixing valve according to the present invention.
FIG. 2 is a longitudinal sectional view showing a conventional hot and cold water mixing valve.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Valve body 4 Mixed hot water channel 10 Flow rate detection tube 11 Flow path 13 Flow sensor 20 Temperature detection tube 21 Flow path

Claims (1)

The high temperature water channel (3) and the opening of the tap water channel (2 ) are controlled by the valve body (5) driven by the output rod (7A) of the motor (7 ) and the output rod (6A) of the wax member (6). And
A valve body (1) for supplying hot water of a predetermined temperature toward the mixed hot water passage (4) ;
A flow rate detection tube (10) comprising a flow sensor (13) for detecting and outputting the flow rate of hot water flowing in the flow path (11);
Provided temperature detecting pipe body comprising a thermistor (22) that detects and outputs the temperature of the hot water flowing through the flow channel (21) and (20), the individual,
The mixed hot water passage (4) of the valve body, the flow passage (11) of the flow rate detection tube (10), and the flow passage (21) of the temperature detection tube (20) are arranged upstream from the upstream in the fluid flow direction. A plurality of spiral walls (12) are arranged in the upstream flow path (11) in the flow path (11) of the flow rate detection tube body, and are connected and arranged in a straight line toward the downstream. 12) An electric hot and cold water mixing valve, wherein the flow sensor is disposed in a flow path (11) on the downstream side of 12).

Images