JPH07317929A - Three way motor-operated valve - Google Patents

Abstract

PURPOSE:To improve the operating accuracy of a valve body, by absorbing an inertial rotation amount of a motor owing to an inertia after the driving motor is rotated to a specific position so as to turn off a power source, with the idle running scope of an intermittent movement transmitting means. CONSTITUTION:A voltage is applied to an electric connector 66 in order to convert the position of a three way solenoid valve 31, and a microswitch is operated to drive a driving motor 51. And the motor 51 stops when it comes to a specific position, but the motor 51 does not stop instantly by an inertia, and rotates excessively a little by the inertia. As a result, the driving section 60 of a Geneva mechanism (an intermittent movement transmitting means) continues the rotation together with the motor 51. However, since the driven section 61 of the Geneva mechanism is provided with an idle running scope to the driving section 60, the rotation is not transmitted. Consequently, a valve 37 stops in the condition to make a flow passage 37a coinside to openings 34 and 33 perfectly.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a three-way electric valve for switching and operating a flow path of a fluid flowing in a pipe, and more particularly to a drive shaft of a motor and a valve shaft of a three-way ball valve using a spherical valve element in a valve portion. And a three-way motorized valve for switching the valve by a changeover switch that performs a switching action in cooperation with the rotation of the valve shaft.

[0002]

2. Description of the Related Art FIGS.
FIG. 13 shows a conventional three-way motorized valve disclosed in Japanese Patent No. 8821, FIG. 13 is a sectional view showing the structure of the three-way motorized valve, FIG. 14 is a sectional view taken along line DD of FIG. 13, and FIG. FIG. 16 is a wiring diagram of a three-way motorized valve. 13 to 16, 1 is a valve body, 2, 3, 4 are openings, 5 is a valve shaft, and 6 is a packing inserted between the valve shaft 5 and the valve body 1. Reference numeral 7 denotes a spherical valve body having an L-shaped through hole 7a at a substantially central portion, and is housed in the valve body 1 in a state of being sandwiched by valve seats 8 and 9 from both sides. Reference numeral 10 is a drive motor, which is a motor mount 11 and a heat insulating plate 12.
It is attached to the valve body 1 by the main mount 13 via. The drive shaft 14 of the drive motor 10 is the clutch 1
It is connected to the valve shaft 5 via 5a and 15b.
Incidentally, 16 is a casing. Also, the clutch 15a
As shown in FIG. 15, a cam portion 17 having a recess 17a is provided at one location on the circumference, while the motor mount 1
In FIG. 1, 9 microswitches 18a and 18b each performing an ON-OFF action in cooperation with the cam portion 17 are provided.
They are installed 0 degrees apart.

Next, the operation will be described. In the connection diagram shown in FIG. 16, 19 is a power supply, 20 is a control switch,
First, as shown in FIGS. 13 to 14, the opening 2 and the opening 3 are formed.
When the control switch 20 and the contact are connected,
On the side, the microswitch 18a is the recess 1 of the cam 17.
7a, in the OFF state, while the micro switch 18
b is in the ON state. From this state, the control switch 20
Is switched to the contact 22 side, the supply circuit I to the drive motor 10 is closed, and the drive motor 10 starts reverse driving. When the valve shaft 5 rotates 90 degrees and the valves are switched so that the opening 2 and the opening 4 are communicated with each other, the concave portion 17a of the cam 17 comes to the position of the micro switch 18b, so that it is turned off. , The supply circuit I is opened, and the drive motor 10 is stopped. At this time, the micro switch 18
Since a is removed from the concave portion 17a of the cam 17, it is in an ON state. Next, to switch back to the original position, the control switch 20 is switched to the contact 21 side, and this time the circuit I
When I is closed, the drive motor 10 rotates in the forward direction. By such an operation, the flow path of the fluid in the valve can be switched.

[0004]

Since the conventional three-way motorized valve is constructed as described above, the micro switch 1 by the cam 17 is used to stop the valve shaft 5 by rotating 90 degrees.
Power supply O to drive motor 10 by switching between 8a and 18b
Since the FF is used, the drive motor 10 continues to rotate due to the inertia unless the microswitches 18a and 18b are turned off unless the drive motor 10 having a very low rotation speed and low inertia is used.
The recess 17a of 7 has passed through the microswitch,
The micro switch is turned on again and the drive motor 1
There was a problem that 0 started rotating again. Further, it is possible to obtain only the state in which the opening 2 and the opening 3 are communicated with each other or the state in which the opening 2 and the opening 4 are communicated with each other. The opening 3 is in communication with the opening 3, or the opening 2 is the opening 3
However, there is a problem in that it is not possible to obtain a state of being communicated with both the opening 4 and the opening 4, and the state of communication is limited. In addition, the spherical valve body 7 is in the valve body 1, and the valve seat 8,
Since it is sandwiched and supported by 9, there is no clear center of rotation, and the center of rotation of the valve body 7 and the center of rotation of the valve shaft 5 do not exactly match due to variations in the processing dimensions of the valve component parts. During the rotation of 5, the twisting occurs at the fitting portion of the valve shaft 5 and the valve body 7, and therefore the drive motor 1
There is also a problem that 0 becomes an overloaded state and cannot be operated, and a gap is created between the valve body 7 and the valve seat 9 to cause fluid leakage. Further, in order to stop the valve body 7 at a predetermined position, it is necessary to attach components such as a micro switch for detecting the position of the valve body 7 to the predetermined four types of positions, and the operation of the position detection component at each position. There is also a problem that it takes a long time to assemble, because it is necessary to sequentially attach and fix them while checking.

The present invention has been made in order to solve the above-mentioned problems, and it is possible to surely switch four communication states to three opening portions and to improve the operating accuracy of the valve body. And to obtain a three-way motorized valve that is easy to assemble.

[0006]

A three-way motorized valve according to the present invention comprises a drive motor capable of rotating in the forward and reverse directions, two through holes on the same shaft, and a through hole provided in a direction perpendicular to the shaft. A three-way motorized valve including a fluid passage and a valve body having a T-shaped passage connected as necessary, wherein the drive motor rotates the valve body to switch the fluid passage. The means for transmitting a force to the valve body is an intermittent motion transmitting means having a driving node and a driven node and transmitting intermittent motion from the driving node moving at a constant speed to the driven node. .

Further, a forward / reverse rotation field winding is provided with a forward rotation field winding and a reverse rotation field winding, and the forward rotation field winding and the reverse rotation field winding of the drive motor are selected. The contact switching means for performing and the contact switching means for turning on / off the power source of the drive motor are provided as a pair corresponding to the stop position of the valve body,
The contact of the contact switching means is opened and closed by a cam that is rotated with the rotation of the valve body to open and close the contact of the contact switching means.

Further, a field winding for forward rotation and a field winding for reverse rotation are provided, and a plurality of phases corresponding to the stop position of the valve body are interlocked with the rotation of the valve body rotated by a drive motor capable of forward and reverse rotation. An encoder that outputs a signal indicating the position of the valve element and a signal indicating the stop range of the valve element, and a position switching signal that commands the encoder signal and the stop position of the valve element are input,
A rotation direction logic circuit that outputs a signal that determines the rotation direction of the drive motor that drives the valve body, and a position switching signal that commands the encoder signal and the stop position of the valve body are input, and the drive motor is driven or A motor drive logic circuit that outputs a signal for determining stop, and a drive signal that receives each output of the rotation direction logic circuit and the motor drive logic circuit as an input and outputs a forward rotation drive signal or a reverse rotation drive signal corresponding to the signal. Circuit and the output of the drive signal circuit as inputs, and are connected to the forward rotation field winding or the reverse rotation field winding of the drive motor, respectively, and the forward rotation field winding is responsive to the signal of the drive circuit. Alternatively, the operation of the drive motor is controlled by a control circuit composed of a switching element that conducts or blocks the current of the field winding for reverse rotation.

[0009]

In the three-way motorized valve according to the present invention, the valve body having the T-shaped passage is rotated in the valve body by the drive motor so that the three openings can be switched to four communication states. In the motor-operated valve, the drive motor rotates to a predetermined position and the drive motor power supply is turned off.
Since the inertial rotation amount of the drive motor due to inertia is absorbed within the idling range of the intermittent motion transmitting means after the shift to F, the valve shaft does not advance beyond a predetermined position and the valve body stops at a predetermined stop position. To do.

Further, since the contact switching means automatically sets the rotation direction when the valve body rotates from the current stop position to the next stop position, selection of a path in which the valve body switching time is always the shortest. , Or a route that does not pass through a position that is not desirable to pass as a switching route is automatically set.

Further, the rotation direction logic circuit calculates a position switching signal for instructing the stop position of the valve body and an encoder signal which is a position signal of the valve body by a predetermined logic and outputs a signal indicating the rotation direction. The motor drive logic circuit logically operates the position switching signal and the encoder signal and outputs a signal for driving the motor until the encoder outputs a position signal of the valve body corresponding to the switching signal. Also, the drive motor of the three-way electric valve is controlled by the drive signal circuit which logically operates the forward rotation drive signal or the reverse rotation drive signal according to the signal output from the motor drive logic circuit.

[0012]

Embodiments of the present invention will be described below. Example 1. 1 to 11 show a three-way motorized valve according to Embodiment 1 of the present invention. FIG. 1 is a vertical sectional view showing the structure of the three-way motorized valve, and FIG. 2 is a vertical sectional view taken along the line AA in FIG. Three
1 is a horizontal cross-sectional view taken along the line BB in FIG. 1, FIG. 4 is a horizontal cross-sectional view taken along the line CC in FIG. 1, and FIG. 5 is a connection diagram of the three-way motorized valve.
In the figure, 31 is a valve body, 32, 33 and 34 are openings provided in valve seats 38, 39 and 40 described later at 90 degree intervals, and 35 is a valve shaft with respect to the valve body 31 by a retaining ring 36. It is locked out. A spherical valve element 37 has a T-shaped passage 37a composed of two through-holes on the same axis and a through-hole in the direction perpendicular to the axis, and valve seats 38, 39,
The valve body 3 is sandwiched by 40 and 41.
It is housed in 1. 42 is the valve shaft 35 and the valve body 37
Is an intermediate shaft forming an Oldham's shaft coupling that absorbs the axial deviation between the valve shaft 35 and the valve element 37 between and. Other universal shaft joints, such as rubber shaft joints, metal spring shaft joints, and flexible shafts may be used. 43 is a packing O inserted between the valve body 31 and the valve shaft 35.
Rings 44, 45, 46, and 47 are packing O-rings inserted between the valve body 31 and the valve seats 38, 39, 40, and 41. Reference numeral 48 is a packing O-ring inserted between the screw 50 and a plate 50 fixed to the valve body 31.
Reference numeral 51 is a forward rotation field winding 51a and a reverse rotation field winding 51b.
A direct current motor is generally used as a drive motor having a rotary shaft 52, which is a gear, and meshes with a large gear side 53a of a spur gear 53. Then, the small gear side 53b of the spur gear 53 is transmitted to the driving node 60 of the Geneva mechanism through the planetary gear mechanism including the planetary gears 54, 55 and 56, the sun gears 57 and 58, and the internal gear 59. . 6
1 is a follower of the Geneva mechanism which is an intermittent motion transmission means,
One end 61a of the central shaft is fitted to the valve shaft 35, and cams 63a to 63h corresponding to the micro switches 62a to 62h, which are contact switching means for detecting the position of the valve body 37, are provided on the other end 61b side. It is installed.

The Geneva mechanism is a follower 6 of the Geneva mechanism.
1 is used for intermittent movement, and details are shown in FIG. When the driving joint 60 of the Geneva mechanism rotates, the driven joint 61 is guided by the circumferential portion of the driving joint 60 and is driven by the driven portion 6.
1 is transmitted. With the movement of the pin 60a which is engaged with the groove portion 61b of the driven joint 61 and rotates the plane portion of the driving joint 60, the driven joint 61 makes an intermittent motion. In addition, 64 is a center shaft for the driving joint of the planetary gear mechanism and the Geneva mechanism, 65 is a plate for preventing the planetary gear 54 from falling off, 6
Reference numeral 6 is an electrical connector, and 67 is a casing.

In the above-mentioned embodiment, the Geneva mechanism is used as the one in which the driving joint 60 and the driven joint 61 are intermittently moved, but any intermittent gear such as an intermittent gear device or an intermittent pin gear device may be used. Further, in the above-described embodiment, the drive motor 51 is the drive motor having the forward rotation field winding 51a and the reverse rotation field winding 51b. The rotation direction of the drive motor may be switched between normal rotation and reverse rotation by changing the polarity of the winding. In addition, FIG. 6 is a flow path diagram showing a communication state of the openings at each position of the valve,
Further, FIG. 7 is a cam configuration diagram showing the relationship between the cam shape and the micro switch when the rotation direction of the valve body at the time of switching is set as shown in Table 1 below, and shows the case where the valve is in position I. .

[0015]

[Table 1]

Every other one of the above-mentioned cams 63a to 63h, a cam 63a, a cam 63c, a cam 63e and a cam 6 are provided.
One concave portion is provided on the outer circumference of 3g, and the concave portions are respectively cam 63a and cam 63c, cam 63c and cam 63, respectively.
e, the cam 63e and the cam 63g are provided with cams displaced by 90 degrees. In this way, the cams provided with recesses every other one are arranged by shifting by 90 degrees so that the cams with openings other than the specified ones can be temporarily distributed in the process of switching to the openings with the specified valve. It is arranged to avoid
However, if the opening may be temporarily allowed to flow, recesses may be provided on the outer circumference of one cam at positions displaced by 90 degrees. Further, although the cams 63a to 63h use eight types of cams, this satisfies the condition shown in Table 1 that when the above-mentioned valves are switched, those with openings other than the predetermined ones do not flow even temporarily. This is the required configuration.

The operation of the three-way motorized valve configured as described above will be described. In the connection diagram shown in FIG. 5, a voltage is currently applied to the A terminal of the electric connector 66, and the valve is in the position I in which the opening 32 and the opening 34 are in communication with each other. To switch the valve from this state to position III, for example, the voltage at the A terminal of the electrical connector 66 is OF
After setting to F, a voltage may be applied to the E terminal, and the voltage of the E terminal enters the micro switch 62f via the micro switch 62e in the ON state. Here, since the micro switch 62f forms a circuit on the side of the field winding 51a for forward rotation, the drive motor 51 starts rotating to the side of forward rotation. Then, the valve goes through the state of midway position II, the valve shaft 35 rotates 180 degrees, and the valve opens the opening 32 and the opening 33.
When the state of the position III is communicated with and, the micro switch 62e is turned off, and the drive motor 51
The voltage to is cut off. However, the drive motor 51 does not immediately stop due to the inertia, and continues to rotate slightly. However, at this time, the driving node 60 of the Geneva mechanism continues to rotate in accordance with the rotation of the drive motor 51, but the driven node 61 does not continue to rotate because the driving node 60 is in the idling range, and the valve element 37 is not connected to the passage 37a. Openings 32, 33
Stops at the position where is completely matched.

Next, in order to switch the valve from the state of position III to the position of position II again, for example, the voltage of the E terminal of the electric connector 66 is turned off and then the voltage is applied to the C terminal. The voltage at the C terminal enters the micro switch 62d via the micro switch 62c. At this time, at the time of switching from position I to position III, the cams 63a to 63h are
Since all of them also rotate 180 degrees in the forward rotation direction at the same time, the micro switch 62d is switched to the field winding 51b for reverse rotation, so that the drive motor 51 starts rotating to the reverse rotation side. When the valve shaft 35 is rotated by 90 degrees and the valve is in the state of position II in which the opening 32, the opening 33, and the opening 34 are simultaneously connected, the micro switch 62c
Turns off and the voltage to the drive motor 51 is cut off.
At this time as well, the drive motor 51 does not immediately stop due to inertia, but the passage 37a of the valve body 37 also stops at a position completely aligned with the openings 32, 33 and 34 due to idling of the Geneva mechanism. Although the micro switch is used as the contact switching means in the above embodiment, an optical switch or a proximity switch may be used.

The above operation is repeated to switch the valve element. When the valve shaft 35 rotates, the valve shaft 35
Even if eccentricity exists in the center of rotation of the valve element 37 and the valve element 37, the eccentricity is absorbed by the action of the Oldham's shaft coupling mechanism by the intermediate shaft 42, so that a prying force is generated between the valve shaft 35 and the valve element 37. Therefore, it is possible to prevent the drive motor from being overloaded. Further, the valve body 37 is kept in contact with the valve seats 38, 39, 40, and 41 evenly, so that the sealed state between the valve body 37 and the valve seats 38 to 41 is always kept in the optimum state. be able to. Further, in FIG. 5, B, D, F and H of the electrical connector 66 are shown.
If a lamp circuit is connected to the terminal of, the position of the valve can be displayed by a lamp, and the switching state of the three-way valve can be monitored from a remote place. Further, the lamp may be a colored lamp or a light emitting diode.

Due to the above, 4 for 3 openings of the valve
Two communication states are obtained, and the passage of the valve body is accurately stopped at the position where the passage is completely aligned with the opening. Also,
When switching from the current valve body position to the next position, the rotation direction of the valve body and the intermediate path can be arbitrarily set.

Example 2. FIG. 8 is a control circuit diagram of a three-way motorized valve according to the second embodiment of the present invention. In FIG. 8, X1
˜X4 is a position switching signal for instructing the valve body 37 to set the position I to position IV, Y is an output signal of an encoder described later, and four-phase signals A to D indicating the position of the valve body and stopping of the valve body 37 The electric signal is composed of a signal Z indicating the range, and is an electric signal which changes to the H level or the L level in the pattern shown in FIG. 9 in synchronization with the rotation of the valve body 37 and the change to the positions I to IV. Reference numeral 80 designates the signals X and Y as input, and logically operates the input Y as shown in FIG. 10 to generate signals M, N, O and P, and when the input X1 is input, the signal M is input and the input X2.
Is input, a signal N is input, an input X3 is input, a signal O is input, and an input X4 is input, a signal P is output signal U (H level: A rotation direction logic circuit for selecting and outputting (forward rotation, L level: reverse rotation), 81 receives the signals X and Y, and FIG.
Input Y is logically operated to generate signals Q, R, S, and T, and when input X1 is input, signal Q is input, when input X2 is input, signal R is input, and input X3 is input. A motor that selects and outputs the signal S as the output signal V when the input X4 is input as the output signal V (H level: drive, L level: stop) that indicates the drive / stop of the valve body. A drive logic circuit 82 receives the signal U and the signal V, and outputs a forward drive signal Wa or a reverse drive signal Wb corresponding to the signal U only when the signal V is at the H level. A transistor for turning on / off a current of a field winding for forward rotation, which will be described later, by the signal Wa.
Reference numeral 4 is a transistor which is a switching element for conducting / cutting off a current in a field winding for reverse rotation, which will be described later, in response to the signal Wb.
Reference numeral 5 denotes a three-way motorized valve, which outputs an encoder 86 that outputs a signal Y including four-phase signals A to D shown in FIG. 9 and a signal Z indicating a stop range of the valve body, an armature winding 87a, and a field winding for forward rotation. Line 87
and a drive motor (direct current) 87 including a field winding 87c for reverse rotation. Reference numeral 88 is a DC power supply that supplies electric power to a motor 87 that drives the valve element of the three-way motorized valve.

In the control circuit configured as described above,
For example, when the valve is switched to the position III when the valve body is in the position I, when the position switching signal X3 is input, the rotation direction logic circuit 80 selects the pattern of the signal O of FIG. 10 to indicate the normal rotation direction. H level output signal U
Is output. At the same time, the motor drive logic circuit 81 selects the pattern of the signal S in FIG. 11 and outputs the H level output signal U indicating the movement. Therefore, the motor drive logic circuit 82
Are signals Wa and L of H level than the signals U and V
The level signal Wb is output to turn on the transistor 83 and turn off the transistor 84. As a result, the DC winding 88 causes the armature winding 8 to pass through the transistor 83.
7a, a current flows through the field winding 87b for forward rotation, the motor 87 rotates in the forward rotation direction, and the valve element moves from position I to position I.
Move from I to position III. When the valve body reaches the position III, the signal V becomes L level, the signal Wa becomes L level, the transistor 83 is cut off, and the rotation of the motor 87 and the movement of the valve body are stopped.
If the valve body goes beyond the stop range of position III to the position IV side due to inertia energy of the valve body or the like, the signal U becomes L level indicating reverse rotation, and the motor drive logic circuit 82 outputs an L level signal. The signal Wb of Wa and H level is output, and the transistor 83 is cut off.
The transistor 84 is turned on. As a result, DC power supply 8
8 through the transistor 84 through the armature winding 87
a, current flows through the field winding 87c for reverse rotation, the motor 87 rotates in the reverse direction, and the valve body returns to the stop range of position III.

Similarly, when the valve body is moved from a certain position state other than the above to another position, the signals M, N, O, P and the motor in the rotation direction logic circuit 80 are similarly changed by the switching signals X1 to X4. The purpose can be achieved by selecting the signals Q, R, S, T in the drive logic circuit 81 and driving the motor 87. Further, the content of the logical operation of the rotation direction logic circuit 80 is an example for realizing the moving direction of the valve body shown in Table 1, but it can be easily realized for other arbitrary moving directions by changing the logical operation content. You can

The control circuit for controlling the operation of the drive motor for the three-way motorized valve may be constituted by the following control circuit. As shown in FIG. 12, the control circuit of the drive motor is connected to the shaft of the valve body, and an encoder 86 for outputting a rotational position signal of the valve body and a position of the valve body are inputted with a command signal and the encoder signal. The output of the motor drive circuit 90 and the motor drive circuit 90 that outputs a drive signal for rotating the drive motor 87a by comparing the signal deviation with a predetermined reference deviation to determine the necessity of rotation of the valve body The drive signal is input to the winding 87 of the drive motor 87a.
b, 87c, which are connected in series and are set in advance in the direction of rotation (H /
Transistor 83, 84 for driving the motor according to W or ROM).

As described above, the stop position of the valve element can be easily set, and the rotation direction of the valve element can be easily set and changed. Further, even if the motor-operated valve is replaced by changing the model and specifications of the motor-operated valve, it can be easily dealt with by changing the setting of the control circuit input condition.

[0026]

As described above, according to the present invention, in the three-way electric valve that rotates the valve body having the T-shaped passage to switch the passage of the fluid, the valve body passes from the drive motor through the intermittent motion transmitting means. Since it is configured to rotate with respect to the opening, it is possible to accurately stop at the position where the passage of the valve body is completely aligned with the opening and obtain the maximum communication state with respect to the predetermined opening.

Further, a motor equipped with a field winding for forward rotation and a field winding for reverse rotation is used as a drive motor, and two contact switching means are provided for each stop position of the valve body, one of which is provided. The contact switching means selects either the forward rotation field winding or the reverse rotation field winding, and the other contact switching means is connected so as to turn on / off the power supply of the drive motor to connect them together with the valve shaft. Since it is configured to operate with a rotating cam, it is possible to arbitrarily set the rotation direction of the valve element and the intermediate path when switching from the current position to the next position by changing the shape of the cam. The effect is obtained.

Further, an encoder for detecting the position of the valve body, a motor drive logic circuit and a rotation direction logic circuit for logically operating the position switching input signal and the encoder signal and outputting a signal indicating the movement and movement direction of the valve body. Since it is possible to control the drive motor that rotates the valve body, the stop position of the valve body can be easily set, and the rotation direction of the valve body can also be easily set and changed, and in the specifications of the electric three-way valve, Alternatively, it is possible to easily respond to a change in model.

[Brief description of drawings]

FIG. 1 is a vertical sectional view showing a three-way motorized valve according to a first embodiment of the present invention.

FIG. 2 is a vertical sectional view taken along the line AA in FIG.

3 is a cross-sectional view taken along the line BB in FIG.

4 is a cross-sectional view taken along the line CC in FIG.

FIG. 5 is a connection diagram of the three-way motorized valve according to the first embodiment of the present invention.

FIG. 6 is a flow path diagram of the three-way motorized valve according to the first embodiment of the present invention.

FIG. 7 is a cam configuration diagram showing a relationship between a cam and a micro switch of the three-way motorized valve according to the first embodiment of the present invention.

FIG. 8 is a configuration diagram showing a control circuit for a three-way motorized valve according to a second embodiment of the present invention.

FIG. 9 is an encoder signal output chart of the three-way motorized valve according to the second embodiment of the present invention.

FIG. 10 is a logical operation chart of the rotational direction logic circuit of the three-way motorized valve according to the second embodiment of the present invention.

FIG. 11 is a logical operation chart of a motor drive logic circuit for a three-way motorized valve according to a second embodiment of the present invention.

FIG. 12 is a configuration diagram showing another control circuit of the three-way motorized valve according to the second embodiment of the present invention.

FIG. 13 is a vertical cross-sectional view showing the structure of a conventional three-way motorized valve.

14 is a transverse sectional view taken along the line DD in FIG.

15 is a cross-sectional view taken along the line EE in FIG.

FIG. 16 is a wiring diagram of a conventional three-way motorized valve.

[Explanation of symbols]

 31 Valve body of three-way valve 32, 33, 34 Opening 35 Valve shaft 37 Valve body 37a Passage (T-shaped passage) 38, 39, 40, 41 Valve seat 42 Intermediate shaft 51 Drive motor 51a Forward rotation field winding 51b Field winding for reverse rotation 52 Rotating shaft of drive motor 60 Driving node of Geneva mechanism (intermittent motion transmission means) 61 Driven node of Geneva mechanism (intermittent motion transmission means) 62a to h Micro switch (contact switching means) 63a to h Cam 80 rotation direction logic circuit 81 motor drive logic circuit 82 motor drive signal circuit 83, 84 transistor (switching element) 87 drive motor 87b forward rotation field winding 87c reverse rotation field winding

Claims (3)

[Claims] 1. A T-shaped drive motor comprising a forward-reverse rotatable drive motor, two through holes on the same shaft, and a through hole provided in a direction perpendicular to the shaft, which is connected to an external fluid passage as required. A valve body having a passage, wherein in the three-way electric valve for rotating the valve body by the drive motor to switch the fluid passage, the means for transmitting the rotational force from the drive motor to the valve body is a driving node. A three-way motorized valve having a follower joint, which is an intermittent motion transmitting means for transmitting an intermittent motion from a prime mover moving at a constant speed to the follower joint. 2. A drive motor, comprising a forward rotation field winding and a reverse rotation field winding, capable of forward and reverse rotation, and selection of the forward rotation field winding and the reverse rotation field winding of the drive motor. The contact switching means for performing and the contact switching means for turning on / off the power supply of the drive motor are provided as a pair corresponding to the stop position of the valve body, and rotate with the rotation of the valve body to open / close the contact of the contact switching means. The three-way motorized valve according to claim 1, wherein the contact of the contact switching means is opened and closed by a cam formed so as to operate. 3. A plurality of phases provided with a field winding for forward rotation and a field winding for reverse rotation, interlocking with rotation of a valve body rotated by a drive motor capable of forward and reverse rotation, and corresponding to a stop position of the valve body. An encoder that outputs a signal indicating the position of the valve element and a signal indicating the stop range of the valve element, and a drive that drives the valve element by inputting the encoder signal and a position switching signal that commands the stop position of the valve element A rotation direction logic circuit that outputs a signal that determines the rotation direction of the motor, and a position switching signal that commands the stop position of the encoder signal and the valve body are input, and a signal that determines whether to drive or stop the drive motor is output. And a drive signal circuit that receives each output of the rotation direction logic circuit and the motor drive logic circuit as an input and outputs a forward rotation drive signal or a reverse rotation drive signal in response to the signal. , The output of the drive signal circuit as an input, respectively connected to the forward rotation field winding or the reverse rotation field winding of the drive motor, depending on the signal of the drive circuit, the forward rotation field winding or the reverse rotation The three-way motorized valve according to claim 1, wherein the operation of the drive motor is controlled by a control circuit configured by a switching element that conducts or blocks the current of the field winding.