JPH086831B2 - Control device for electric three-way valve - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to control of an electric three-way valve, and is suitable for use in controlling an electric three-way valve for switching fluids such as a hot water heater.

[0002]

2. Description of the Related Art A hot water heater is shown as an example of an electric three-way valve. A hot water heating device including two radiators includes an electric three-way valve that switches hot water heated by a heating unit to one radiator or the other radiator. Some electric three-way valves switch a flow path by pressing a valve body against a valve body (a part of the branch pipe) inside the branch pipe.

[0003]

The electric three-way valve for pressing the valve body against the valve body to switch the flow path is operated when the operation is stopped while hot water is supplied to only one radiator, that is, the valve body. When the electric three-way valve is stopped while the valve body is pressed against the valve body, if the electric three-way valve is not used for a long time in that state, the valve body and the valve body may stick. Also, during operation, the valve body is strong against the valve body.
When pressed, the valve body and valve body are
There is a possibility that they will stick together.

[0004]

SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances, and an object of the present invention is, for example, in the case where a stopped state of operation continues.
The valve body can be branched without using an electric three-way valve for a long period of time.
It does not stick to the pipe, and the valve disc is
The purpose of the present invention is to provide a control device for an electric three-way valve in which the branch pipe and the branch pipe do not stick together .

[0005]

The control device for the electric three-way valve of the present invention employs the following technical means. The control device for the electric three-way valve includes one inflow port for inflowing a fluid, and two outflow ports for outflowing the fluid inflowing from the inflow port,
Inside, an inlet communicating with the inlet, a branch pipe provided with two outlets respectively communicating with the two outlets, movably arranged in the branch pipe, and surrounding one or the other of the two outlets pressed against the said one of the two outlets, or the valve body which closes the other, and an electric three-way valve having a pulse motor for moving the valve body in the branch pipe, before
And a controller for controlling the position of the valve body by controlling the pulse motor . Further, in this control device, when the operation is stopped, the position of the valve body is set so that the fluid flowing from the inlet is 2
The pulse mode should be adjusted so that it will flow to both outlets.
Provided with a means for preventing that controls over data, in operation
The pulse motor is controlled to
Target position when blocking one or the other of the two outlets
2nd sticking prevention which returns the above-mentioned pulse motor several pulses after reaching
A stop means is provided.

[0006]

[0007]

When the operation is stopped, that is, when the electric three-way valve is not controlled by the control device, the sticking prevention means of the control device controls the pulse motor so that the position of the valve body is set to two Position to flow to both exits. In addition, during operation, that is, electric three-way by the control device
With the valve controlled, one of the two outlets is
The valve body reaches the target position when closing one side or the other.
After that, the second sticking prevention means of the control device operates the pulse motor several times.
Ruth return to prevent the valve body from being pressed hard against the branch pipe.
Gu

[0008]

[Effects of the Invention] Since the valve body is separated from the branch pipe during the operation stop , even if the electric three-way valve is not used for a long time,
The valve body is reliably prevented from sticking to the branch pipe.

During operation, the valve body can be prevented from being strongly pressed against the branch pipe, and the sticking due to the valve body being strongly pressed against the branch pipe can be prevented.

[0010]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, a control device for an electric three-way valve according to the present invention will be described with reference to the drawings based on an embodiment applied to a hot water heating device.

[Structure of Embodiment] FIGS. 1 to 5 show a first embodiment of the present invention. FIG. 2 is a hot water circuit diagram of a hot water heating apparatus, and FIG. 3 is a schematic block diagram of a control apparatus. The hot water heating device 1 includes an outdoor unit 3 including a heating unit 2 that heats hot water (heat medium, for example, water mixed with an antifreeze liquid), an indoor heater 5 including a radiator 4 for indoor heating, and an indoor heater. A floor heating radiator 6 such as a hot water mat laid on the floor or a hot water panel installed in the floor. The heating means 2 of the present embodiment is a combustion device 7 that burns fuel such as gas or kerosene.
And an outdoor heat exchanger 8 for exchanging heat generated by the combustion device 7 with hot water. The outdoor heat exchanger 8 and the indoor heating radiator 4 are connected by a hot water pipe 9 to form a hot water circuit. The hot water pipe 9 has a pump 10 for circulating the hot water and a pressure tank for storing the hot water.
11 are provided. A floor heating radiator 6 is connected to the hot water circuit in parallel with the room heating radiator 4. At the branch portion between the indoor heating radiator 4 and the floor heating radiator 6, hot water introduced from the outdoor heat exchanger 8 can be switched to the indoor heating radiator 4 or the floor heating radiator 6 and supplied. An electric three-way valve 12 is provided. Electric three-way valve 12 of this embodiment
In addition to switching hot water, the hot water can be simultaneously sent to both the indoor heating radiator 4 and the floor heating radiator 6, and at that time, the indoor heating radiator 4 and the floor heating radiator 6 It is possible to change the supply rate to the.

The electric three-way valve 12 used will be described. As shown in FIG. 1, the electric three-way valve 12 of this embodiment includes a branch pipe 13, a valve body 14, a valve body 15 and an electric actuator 16. The branch pipe 13 is connected to the hot water pipe 9, and is connected to the inflow port 17 connected to the outdoor heat exchanger 8 via the hot water pipe 9 and the indoor heating radiator 4 via the hot water pipe 9. A first outlet 18 and a second outlet 19 connected to the floor heating radiator 6 via the hot water pipe 9. The branch pipe 13 is a tubular body in which the valve body 14 is arranged.
A first outlet 18 and a second outlet are provided on both end side surfaces of 20, respectively.
19 is provided, and the inflow port 17 is provided on the side surface of the tubular body 20 at an intermediate position between the first outflow port 18 and the second outflow port 19. The valve body 14 has a substantially tubular shape provided in the tubular body 20 of the branch pipe 13, and has an inlet 21 communicating with the inflow port 17 on the side surface, and first and second outflow ports 18 and 19 at both ends, respectively. The first and second outlets 22 and 23 communicating with each other are provided. The valve body 15 is a valve body
Inside 14, a disk-shaped metal plate 24 movably arranged is provided, and resin packing 25 such as Teflon (trademark) provided on both surfaces of the metal plate 24. In this resin packing 25, the valve body 15 has a first outlet 22 or a second outlet 23.
When closing either one of the above, abut on the valve body 14,
It is intended to prevent hot water from leaking from the blocked outlet. The electric actuator 16 connects the valve body 15 to the valve body 14
It is to be moved inside, and is composed of a pulse motor 26, a rotating body 27 rotated by the pulse motor 26, and an operating rod 28 which converts the rotation of the rotating body 27 into a displacement amount and transmits it to the valve body 15. The pulse motor 26 of the present embodiment rotates once for 1000 pulses, and the energization is controlled by the control device 29 described below. Further, the output portion of the pulse motor 26 is provided with an idling mechanism (not shown) that idles when the valve body 15 comes into contact with the valve body 14 and cannot move. Then, depending on the valve body 15, the first outlet 22 or the second outlet 22
When the outlet 23 is closed, the pulse motor 26 is rotated a little excessively by the control device 29 so that the valve body 15 is surely closed the first outlet 22 or the second outlet 23.

A specific example will be shown. The stroke amount of the valve body 15 is 7,000 pulses by the pulse motor 26, and when closing one outlet, the stroke amount of the valve body 15 is more than 9000 pulses.
A pulse is applied and idled for 2000 pulses.

The indoor heater 5 is provided with a convection fan 30 that sucks the air in the room and blows it out into the room again. The indoor heating radiator 4 is arranged in the air flow path of the convection fan 30 in the indoor heating device 5, and the hot water supplied to the indoor heating radiator 4 and the air blown into the room are heat-exchanged. To heat the room.

Electrical components such as the combustion device 7, the pump 10, the electric three-way valve 12, the convection fan 30, and the display means 31 for displaying the operating state to the user, which are provided in the hot water heating system 1, are shown in FIG. It is controlled by the controller 29. The control device 29 of the present embodiment uses a microcomputer, and the indoor heating switch 32 operated by the user, the floor heating switch 33, the room temperature detecting means 34 for detecting the indoor temperature, the room temperature desired by the user. The room temperature setting means 35 to be set, the hot water temperature detecting means 36 for detecting the hot water temperature passing through the outdoor heat exchanger 8 and the like are provided, and the operation of each electric component of the hot water heating device 1 is controlled.

The control device 29 includes a sticking prevention means 37 for preventing sticking of the valve body 15 when the hot water heating system 1 is not operating (when the electric three-way valve 12 is not used), and the valve body 15 of the electric three-way valve 12. Exit 1
A second sticking prevention means 38 for preventing sticking of the valve body 15 when the second outlet 23 or the second outlet 23 is closed is programmed.

An example of the operation of the sticking prevention means 37 will be described with reference to the flowchart of FIG. First, in step S1, it is determined whether the heating operation has stopped. If the result of this determination is NO, the process returns to step S1. Step S1
If the result of the determination is YES, the electric three-way valve 12 is brought into the simultaneous operating state of indoor heating and floor heating in step S2, and then the process ends.

An example of the operation of the second sticking prevention means 38 will be described with reference to the flowchart of FIG. First, step S3
At, it is determined whether or not there is an instruction signal to close the first outlet 22. If the determination result is YES, step S
At 4, the operation signal is given to the electric actuator 16 so that the valve body 15 closes the first outlet 22. Specifically, the valve body
With the 15 being pressed against the valve body 14 around the first outlet 22, a slight excess of pulse signal (eg 2
000 pulses). Then, in step S5, the electric actuator 16 is operated by several pulses (specifically, the first outlet 22) so that the valve body 15 slightly loosens the first outlet 22.
The number of pulses is set so that the fluid does not flow into the chamber (eg, 1500 pulses), and the process is completed. In addition, the judgment result of step S3 is
In the case of NO, it is determined in step S6 whether or not there is an instruction signal to close the second outlet 23. The result of this judgment
In case of YES, the second outlet 23 is connected to the valve body in step S7.
An operation signal is applied to the electric actuator 16 so that 15 is closed. Specifically, with the valve body 15 being pressed against the valve body 14 around the second outlet 23, a slightly excessive pulse signal (for example, 2000 pulses) is applied to the electric actuator 16 so that the electric actuator 16 idles. give. Subsequently, in step S8, several pulses are applied to the electric actuator 16 to the extent that the valve body 15 slightly loosens the second outlet 23 (specifically, the number of pulses such that the fluid does not flow to the second outlet 23, for example, 1500). Pulse) give. On the other hand, if the decision result in the step S6 is NO, the process returns to the step S3.

[Operation and Effect of Embodiment] Next, the operation of the above embodiment will be briefly described. When the operation of the indoor heating or the floor heating is stopped, the valve device 15 is operated by the control device 29.
Stops at the position where it performs indoor heating and floor heating. The positions for performing indoor heating and floor heating are the inlet 21, the first outlet 22, and the inlet 21.
And the second outlet 23 are in communication with each other, the valve body 15 does not contact the valve body 14. As a result, even if the valve body 15 is left in this state for a long period of time, the valve body 15 does not stick to the valve body 14.

Further, the first outlet 22 or the second outlet 23 is connected to the valve body.
When it is closed by 15, the outlet is once closed by the electric actuator 16 and then loosened so that the fluid does not flow. As a result,
By pressing the valve body 15 strongly against the valve body 14, it is possible to eliminate the problem that the valve body 15 is fixed to the valve body 14.

[Second Embodiment] FIG. 6 shows a sectional view of an electric three-way solenoid valve according to a second embodiment. The electric three-way valve of the present embodiment uses the inside of the tubular body 20 of the branch pipe 13 as a valve body (see the first embodiment).

[0022]

[Modification] In the above embodiment, an example in which the present invention is applied to an electric three-way valve for switching hot water of a hot water heater is shown.
The present invention may be applied to an electric three-way valve that switches other fluids. In addition, the numerical values shown in the examples are merely examples used for explanation, and the present invention is not limited to the numerical values of the present example.

[Brief description of drawings]

FIG. 1 is a sectional view of an electric three-way valve according to a first embodiment.

FIG. 2 is a hot water circuit diagram of the hot water heating device.

FIG. 3 is a schematic block diagram of a control device.

FIG. 4 is a flowchart showing the operation of the sticking prevention means.

FIG. 5 is a flowchart showing the operation of the second sticking prevention means.

FIG. 6 is a sectional view of an electric three-way valve of a second embodiment.

[Explanation of symbols]

 12 Electric three-way valve 13 Branch pipe 15 Valve body 16 Electric actuator 17 Inlet 18 First outlet (two outlets) 19 Second outlet (two outlets) 21 Inlet 22 First outlet (two outlets) 23 Second outlet (two outlets) 29 Controller 37 Sticking prevention means

Claims (1)

[Claims] 1. (a) (a-1) An inflow port for inflowing a fluid, and two outflow ports for outflowing the fluid inflowing from the inflow port, and an inside port communicating with the inflow port, A branch pipe having two outlets respectively communicating with the two outlets, (a-2) movably arranged in the branch pipe, and pressed against one or the other of the two outlets, A valve body that closes one or the other of the two outlets, (a-3) a pulse motor that moves the valve body in the branch pipe.
Comprising an electric three-way valve having a motor, and a control device for controlling the position of said valve body by controlling the (b) the pulse motor, (b-1) The control device, when the operation is stopped, the valve The body is provided with sticking prevention means for controlling the pulse motor so that the fluid flowing from the inlet flows to both the two outlets, and the pulse motor is operated during operation.
Controlled by the valve body to one of the two outlets,
When closing the other side, after reaching the target position, the pulse mode
It is specially equipped with a second sticking prevention means for returning the data for several pulses.
A control device for a motorized three-way valve.