JP2001146974A - Solenoid valve - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a solenoid valve of simple and small structure and improved in lessening the power consumption required to make valve changing-over and also the heat emission of the electromagnetic driving part. SOLUTION: A valve housing 11 is furnished with a first valve chest 12 and second valve chest 13, a first input/output port 14 in communication to the first valve chest, a second 15 and a third input/output port 16 in communication to the second valve chest 13, and a valve port 15 to put the first valve chest 12 in communication with the second valve chest 13. The arrangement further includes a first valve element to open and close the valve port with its movement in the valve lift direction and a working rod 26 installed in the valve housing 11 and connected to the first valve element 22 in such a way as movable in the valve lift direction, and the rod 26 is furnished with a second value element 28 of slide valve type which opens and closes third input/output port 29 with its movement in the valve lift direction. The valve housing 11 is furnished with an electromagneic driving means 33 to drive the rod 11 in steps in the valve lift direction.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electromagnetic valve for switching a fluid flow path (electromagnetic flow path switching valve), and more particularly to a three-position switching method for switching three fluid flow paths by two valve bodies. Type solenoid valve.

[0002]

2. Description of the Related Art As a flow path switching valve for switching a hydraulic flow path of a hydraulic device or a refrigerant flow path of a refrigeration cycle device such as an air conditioner, an electromagnetically driven flow switching valve, a so-called solenoid valve There is. 2. Description of the Related Art There are various types of electromagnetic valves used in hydraulic equipment and refrigeration cycle devices, for example, two valve bodies are individually driven by electromagnetic driving means having two electromagnetic coils and two plungers. There is a three-position type in which switching of three fluid flow paths is performed in three modes.

[0003]

The conventional three-position solenoid valve which can switch the three fluid flow paths in three modes has a problem that the number of parts is large, the structure is complicated, and the size is increased. is there. In addition, since the structure is complicated, it is difficult to dispose the electromagnetic coil and the like at a suitable position. Therefore, the electromagnetic driving efficiency is low, and the power consumption required for switching the valve increases. In addition, as a result, the amount of heat generated by the electromagnetic drive unit increases, and it is necessary to consider heat radiation of the electromagnetic drive unit.

The present invention has been made in view of such a problem, and has as its object to simplify the structure, reduce the size, and further reduce the power consumption required for valve switching.
An object of the present invention is to provide an electromagnetic valve improved so that the amount of heat generated by the electromagnetic drive unit is reduced.

[0005]

In order to achieve the above object,
An electromagnetic valve according to the present invention includes a first valve chamber, a second valve chamber, a first inlet / outlet port communicating with the first valve chamber, and second and third ports communicating with the second valve chamber. Entrance and exit ports of the first
A valve housing formed with a valve port for communicating the valve chamber with the second valve chamber, a first valve element for opening and closing the valve port by movement in a valve lift direction, and connection with the first valve element. And an operating rod provided in the valve housing so as to be movable in the valve lift direction, and the third inlet / outlet port is opened and closed by movement of the operating rod in the valve lift direction. It is characterized by having a second valve body and electromagnetic driving means fixed to the valve housing and driving the operating rod stepwise in the valve lift direction.

In a preferred specific embodiment of the solenoid valve according to the present invention, the first valve body is constituted by a ball valve body, and the third inlet / outlet port is provided in the second valve chamber. The second valve body is formed of a slide-type valve body that opens to the peripheral surface and slides on the inner peripheral surface of the second valve chamber to open and close the third inlet / outlet port. It is characterized by.

In a preferred specific embodiment of the electromagnetic valve according to the present invention, the electromagnetic driving means comprises first and second electromagnetic coils provided in the valve lift direction, a fixed suction element, A first plunger driven in the valve lift direction by excitation of a first electromagnetic coil; and a second plunger driven in the valve lift direction by excitation of the second electromagnetic coil.
A first plunger and a built-in spring, and the first and second electromagnetic coils are energized and de-energized to move the operating rod differently in the valve lift direction.
, And between the second position and the third position, and the operating rod is moved between the first position, the second position and the third position.
The opening and closing of the valve port and the opening and closing of the third inlet / outlet port are performed by the first valve body and the second valve body by being selectively located at any one of the following positions: I do.

In a preferred specific form of the solenoid valve according to the present invention, the first plunger and the second plunger are arranged coaxially side by side in the valve lift direction. A magnetic insulator is provided between the second plunger and the second plunger.

In a preferred specific embodiment of the solenoid valve according to the present invention, the first valve body is provided in the first valve chamber and urged in a valve closing direction by a valve closing spring. The operating rod has a connecting portion that passes through the valve port and is connected to the first valve body.
And the first electromagnetic coil and the second
In the state where both of the electromagnetic coils are non-excited, the operating rod is positioned at the first position, and when only the first electromagnetic coil is in the excited state, the operating rod is positioned at the second position, When the first electromagnetic coil and the second electromagnetic coil are both in an excited state, the operating rod is located at the third position, and in a state where the operating rod is located at the first position, The first valve element opens the valve port away from the valve port against the spring force of the valve closing spring, and the second valve element is located at a position away from the third inlet / outlet port. In the state where the third inlet / outlet port is opened and the operating rod is located at the second position, the first valve body is moved from the valve port against the spring force of the valve closing spring. The valve port is opened while maintaining the separated state, and the second valve element is The aligned with the inlet and outlet ports 3
When the operating rod is located at the third position, the first valve body is engaged with the valve port by the spring force of the valve closing spring. And the second valve element opens the third inlet / outlet port away from the third inlet / outlet port.

According to the electromagnetic valve configured as described above, the first valve body moves in the valve lift direction by the stepwise movement of the operating rod by the electromagnetic driving means in the valve lift direction to open and close the valve port. And the second valve body provided on the operating rod is the third valve body.
Open and close the entrance and exit ports. Thereby, the first switching mode in which the valve port and the third inlet / outlet port are both opened and the first inlet / outlet port communicates with both the second inlet / outlet port and the third inlet / outlet port; A second switching mode in which only the inlet / outlet port of No. 3 is closed and the first inlet / outlet port communicates only with the second inlet / outlet port;
A third switching mode in which the entrance / exit port of the second communication port communicates only with the third entrance / exit port can be selectively obtained.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, an embodiment of a solenoid valve according to the present invention will be described in detail with reference to the drawings. 1 to 3 are sectional views showing three different switching operation states of the solenoid valve according to the present invention, and FIG. 4 is an exploded perspective view of a valve body of the solenoid valve according to the present invention. In these figures, the solenoid valve according to the present invention is generally indicated by reference numeral 10 as a whole. The solenoid valve 10 has a valve housing 11 fitted and mounted in a valve mounting hole 51 formed in a device case 50 of a hydraulic device or a refrigeration cycle device.

The valve housing 11 is made of metal such as brass, and has a first valve chamber 12 and a second valve chamber 12 having a circular cross section.
, A first inlet / outlet port 14 constantly communicating with the first valve chamber 12, and a second inlet / outlet port 14 constantly communicating with the second valve chamber 13.
, A third inlet / outlet port 16 opened on the inner peripheral surface of the second valve chamber 13, and a first valve chamber 12 and a second valve chamber 13 at a center position of the valve housing 11. And a valve port 17 communicating with the valve.

A filter 18 is connected to the first inlet / outlet port 14.
The first inlet / outlet port 14 communicates with a first flow path 52 formed in the equipment case 50, and the second inlet / outlet port 14
The third inlet / outlet port 15 and the third inlet / outlet port 16 communicate with the second channel 53 and the third channel 54 formed in the equipment case 50, respectively.

The valve housing 11 and the equipment case 50
Between them, O-rings 19, 20, 21 for hermetic sealing between the respective inlet / outlet ports and the flow paths are mounted. The first valve chamber 12 and the first inlet / outlet port 14 are provided on the bottom side of the valve housing 11. Inside the first valve chamber 12, a ball valve body made of a steel ball that opens and closes the valve port 17 (the The first valve body 22 is disposed so as to be movable in the valve lift direction (vertical direction in FIGS. 1 to 3).

On the bottom side of the valve housing 11, a spring receiving member 24 having a groove-shaped communicating portion 23 formed on the outer periphery of a cylindrical shape is fixed, and between the spring receiving member 24 and the ball valve body 22. A valve closing spring 25 using a compression coil spring is attached. The valve closing spring 25 urges the ball valve body 22 in the valve closing direction, that is, in the upward direction as viewed in FIGS.

When the ball valve body 22 is opened, the fluid from the first flow path 52 flows from the first valve chamber 12 to the second valve chamber via the inlet / outlet port 14 and the groove-shaped communication portion 23. 13. The operating rod 2 is provided in the second valve chamber 13.
The sixth cylindrical portion 26a is provided so as to be movable in the axial direction, in other words, in the valve lift direction. The operating rod 26 is urged upward by a compression coil spring 27 provided in the second valve chamber 13, and has a small-diameter connecting portion 26 b at the lower end portion that passes through the valve port 17 and abuts on the ball valve body 22. It has integrally.

The intermediate portion of the cylindrical portion 26a of the operating rod 26 has C
A peripheral groove 26c is formed, and C is formed in the peripheral groove 26c.
C-shaped slide valve element (second valve element) 28 and C that urges the slide valve element 28 in the radial direction to slidably press the slide valve element 28 against the inner peripheral surface of the second valve chamber 13. The shape spring 29 is fitted in a detented state.

The slide valve element 28 is positioned at the vertical position just aligned with the third inlet / outlet port 16 by the movement of the operating rod 26 in the valve lift direction, so that the third inlet / outlet port 16 is closed. Is closed and the third inlet / outlet port 16 is opened to the second valve chamber 13 apart from the third inlet / outlet port 16 in other vertical positions.

The slide valve element 28 and the C-shaped spring 29 do not hermetically separate the second valve chamber 13 on both upper and lower sides of these arrangements due to their shapes, as shown in FIG. Even in the position, the third inlet / outlet port 16 is connected to the second inlet / outlet port 1 below the second valve chamber 13.
5 and the state of communication with the valve port 17 are ensured.

Further, the operating rod 26 is provided with a slide formed on the valve housing 11 as a means for preventing rotation of the operating rod 26 so that the slide valve body 28 is maintained at a position correctly facing the third inlet / outlet port 16. A detent pin 31 engaging with the key groove 30 is driven and fixed.

An electromagnetic drive device 3 is mounted on a flange 32 formed on the upper end side (second valve chamber side) of the valve housing 11.
3 is attached. The electromagnetic driving device 33 includes a cylindrical outer case 34, an end cap member 35 attached to a lower end of the outer case 34, and an outer case 3.
A fixed suction element 36 serving also as an end cap airtightly attached to the upper end side of 4, and a plunger tube 37 supported by the end cap member 35 and the fixed suction element 36 and fixed to the center of the outer case 34. The lower end of the outer case 34 is caulked and connected to the flange 32, so that the case side is airtightly fixed to the valve housing 11 via the O-ring 44.

The electromagnetic driving device 33 includes a first electromagnetic coil 38 and a second electromagnetic coil 39 which are coaxially arranged outside the plunger tube 37 in the axial direction (valve lift direction) of the plunger tube 37. A first plunger 40 and a second plunger 41 provided in the plunger tube 37 so as to be coaxially slidable in the axial direction (valve lift direction) of the plunger tube 37 and slidable in the axial direction of the plunger tube 37. A plunger rod 42 with a head fitted into the center hole 40a of the first plunger 40 slidably in the valve lift direction, and a plunger rod 42 provided between the fixed suction element 36 and the plunger rod 42; A first built-in spring 43 formed by a compression coil spring that urges the first plunger 40 in a descending direction. Further, the first plunger 40 and the second plunger 4
A magnetic insulating seal member 45 and a second built-in spring 46 made of a compression coil spring are provided between the end surfaces of the first and second ends.

The upper rod 26d of the above-mentioned operating rod 26 is fitted in the center hole 41a of the second plunger 41 so as to be slidable in the valve lift direction. (Lower end).

Next, the operation of the solenoid valve 10 having the above configuration will be described. FIG. 1 shows a state where both the first electromagnetic coil 38 and the second electromagnetic coil 39 are not excited. In this state, the first and second built-in springs 43, 4
6, the first plunger 40, the second plunger
Are in the lowered position, and the spring force of the first built-in spring 43 is
The operating rod 26 is located at the lowest position where the operating rod 26 is lowered against the spring force of the compression coil spring 27 by the spring force of the first built-in spring 43, that is, the first position.

When the operating rod 26 is located at the first position, the ball valve body 22 is pushed downward by the connecting portion 26b of the operating rod 26, and the valve port 22 is pressed against the spring force of the valve closing spring 25. 17, the valve port 17 is opened, and the slide valve element 28 is located below the third inlet / outlet port 16 to open the third inlet / outlet port 16. As a result, the valve port 17 and the third inlet / outlet port 16 are both opened, and the first inlet / outlet port 14 (first flow path 52) is turned into the second inlet / outlet port 15 (second flow path 53). And the first inlet / outlet port 16 (third flow path 54) communicating with both
Is obtained.

From the state of the first switching mode described above, the first
When only the first electromagnetic coil 38 is energized while the second electromagnetic coil 39 remains de-energized by the energization of the electromagnetic coil 38, as shown in FIG. The first built-in spring 43 together with the rod 42
Is attracted to the fixed adsorber 36 against the spring force. As a result, the operating rod 26 is moved upward by the spring force of the compression coil spring 27 by the amount of suction above the first plunger 40, and the operating rod 26 is located at the intermediate position, that is, the second position.

When the operating rod 26 is located at the second position, the ball valve body 22 is pushed downward by the connecting portion 26b of the operating rod 26 and is separated from the valve port 23 against the spring force of the valve closing spring 25. With the valve port 23 kept open, the slide valve body 28 is aligned with the third inlet / outlet port 16 and the third
Close the entrance / exit port 16 of the. Thereby, the third inlet / outlet port 16 (third flow path 54) is shut off, and the first inlet / outlet port 14 (first flow path 52) is connected to the second inlet / outlet port 15 (second flow path). A second switching mode is obtained which communicates only with the road 53).

From the state of the second switching mode, the first
When the second electromagnetic coil 39 is excited in addition to the first electromagnetic coil 38 by energizing the electromagnetic coil 38 and the second electromagnetic coil 39, as shown in FIG.
While the first plunger 40 is being attracted to the fixed adsorber 36 against the spring force of the first internal spring 43 together with the plunger rod 42, the second plunger 40 is connected to the spring of the second internal spring 46. It is adsorbed to the first plunger 40 against the force, and only the amount adsorbed above the second plunger 40 is
The operating rod 26 together with the plunger rod 42 includes the compression coil spring 2.
7, and the operating rod 26 is located at the highest position, that is, the third position.

When the operating rod 26 is located at the third position, the ball valve 22 is moved by the spring force of the valve closing spring 25 to the valve port 1.
7, the valve port 17 is closed, and the slide valve element 28 is separated from the third inlet / outlet port 16 to open the third inlet / outlet port 16. Thereby, the first inlet / outlet port 14 (first flow path 52) is shut off, and the second inlet / outlet port 15 (second flow path 53) is connected to the third inlet / outlet port 16 (third flow path). A third switching mode communicating with the road 54) is obtained.

When switching from the state of the third switching mode to the second switching mode, the second electromagnetic coil 39
Is stopped, and only the second electromagnetic coil 39 is turned off. As a result, the second plunger 40 descends to the original descending position, the operating rod 26 returns to the second position, and the second switching mode is obtained. Second plunger 4
The magnetic attraction of the first plunger 40 is smoothly released by the magnetic insulating seal member 45 provided between the end faces of the first plunger 40 and the second plunger 41, and the operating rod 26 is securely moved. Return to the second position.

When switching from the above-mentioned second switching mode to the first switching mode, the power supply to the first electromagnetic coil 38 is also stopped, and the first electromagnetic coil 38 is also turned off. . Thereby, the first plunger 39
Also descends to the original descending position, the operating rod 26 returns to the first position, and the first switching mode is obtained.

[0032]

As can be understood from the above description, in the solenoid valve of the present invention, the first valve body and the second valve body are moved by the stepwise movement of the operating rod by the electromagnetic drive means in the valve lift direction. Since the flow path is switched by moving in the valve lift direction, the three fluid flow paths can be switched in three modes without complicating the structure, and the first valve body and the second valve can be switched. By using a ball valve body and a slide valve body, the size can be reduced.

Further, the two electromagnetic coils and the two plungers provided in the valve lift direction are arranged coaxially with each other, so that the electromagnetic drive efficiency is improved and the power consumption required for valve switching is improved. In addition, the amount of heat generated by the electromagnetic driving unit can be reduced, and the size of the electromagnetic driving unit can be reduced.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view showing a first switching mode state of an embodiment of a solenoid valve according to the present invention.

FIG. 2 is a sectional view showing a second switching mode state of the embodiment of the solenoid valve according to the present invention.

FIG. 3 is a cross-sectional view showing a third switching mode state of one embodiment of the solenoid valve according to the present invention.

FIG. 4 is an exploded perspective view of a valve body portion of one embodiment of the solenoid valve according to the present invention.

[Explanation of symbols]

 Reference Signs List 10 solenoid valve 11 valve housing 50 equipment case 12 first valve chamber 13 second valve chamber 14 first inlet / outlet port 15 second inlet / outlet port 16 third inlet / outlet port 17 valve port 22 ball valve body 25 Valve closing spring 26 Operating rod 28 Slide valve element 33 Electromagnetic drive device 34 Outer case 36 Fixed suction element 37 Plunger tube 38 First electromagnetic coil 39 Second electromagnetic coil 40 First plunger 41 Second plunger 42 Plunger rod 43 first built-in spring 45 magnetic insulating seal member 46 second built-in spring

 ────────────────────────────────────────────────── ─── Continuing on the front page (72) Inventor Masayuki Imai 7-17-24 Todoroki, Setagaya-ku, Tokyo Inside Fuji Machine Co., Ltd. F-term (reference) 3H052 AA01 BA03 BA25 BA35 CA12 CD07 DA06 EA11 EA16 3H067 AA04 AA16 BB03 BB14 CC32 CC41 DD05 DD13 DD32 EA21 FF11 GG12 GG15 GG22 GG23 3H106 DA08 DA25 DB02 DB13 DB23 DB32 DC04 DC08 DC18 DD09 EE22 EE34 GA15 GB08 GC23 GC26 KK03 KK23

Claims (5)

[Claims] 1. A first valve chamber, a second valve chamber, a first inlet / outlet port communicating with the first valve chamber, and a second and third inlet / outlet communicating with the second valve chamber. A port, a valve housing formed with a valve port communicating the first valve chamber and the second valve chamber, and a first port for opening and closing the valve port by moving in a valve lift direction.
A valve body connected to the first valve body and provided in the valve housing so as to be movable in the valve lift direction; provided on the operation rod, the valve lift direction of the operation rod A second valve body that opens and closes the third inlet / outlet port by movement of the valve; and an electromagnetic driving means that is fixed to the valve housing and that drives the operating rod stepwise in the valve lift direction. Solenoid valve characterized by the following. 2. The first valve element is constituted by a ball valve element, the third inlet / outlet port is opened on an inner peripheral surface of the second valve chamber, and the second valve element is 2. The solenoid valve according to claim 1, wherein the solenoid valve is configured by a slide-type valve body that slides in contact with an inner peripheral surface of the second valve chamber to open and close the third inlet / outlet port. 3. 3. The electromagnetic drive means includes a first and a second electromagnetic coil provided in the valve lift direction, a fixed attractor, and a drive in the valve lift direction by exciting the first electromagnetic coil. And a second plunger driven in the valve lift direction by excitation of the second electromagnetic coil.
And a built-in spring, wherein excitation of the first electromagnetic coil and the second electromagnetic coil,
By a combination of non-excitation, the operating rod is configured to be driven between a first position, a second position, and a third position that are different in the valve lift direction, and the operating rod is moved between the first position and the third position. By selectively being located at either the second position or the third position, opening and closing of the valve port and opening and closing of the third inlet / outlet port are performed by the first valve body and the second valve body. The solenoid valve according to claim 1, wherein the operation is performed. 4. The first plunger and the second plunger are coaxially arranged side by side in the valve lift direction.
4. A magnetic insulator is provided between the first plunger and the second plunger.
Solenoid valve according to the above. 5. The first valve body is provided in the first valve chamber and is urged in a valve closing direction by a valve closing spring, and the operating rod passes through the valve port and is provided in the first valve. A connection portion connected to a body, wherein the electromagnetic driving means is provided on the second valve chamber side;
When both the first electromagnetic coil and the second electromagnetic coil are not excited, the operating rod is positioned at the first position, and when only the first electromagnetic coil is excited, the operating rod is moved. Is positioned at the second position, and when the first electromagnetic coil and the second electromagnetic coil are both in the excited state, the operating rod is positioned at the third position, and the operating rod is the first position. In the position of,
The first valve element opens the valve port away from the valve port against the spring force of the valve closing spring, and the second valve element is located at a position away from the third inlet / outlet port. Open the third entrance / exit port, and in a state where the operating rod is located at the second position,
Opening the valve port while the first valve body is kept apart from the valve port against the spring force of the valve closing spring;
And, in a state where the second valve body is aligned with the third inlet / outlet port and closes the third inlet / outlet port, and the operating rod is located at the third position,
The first valve body is engaged with the valve port by the spring force of the valve closing spring to close the valve port, and the second valve body is separated from the third inlet / outlet port and the third valve body. The solenoid valve according to claim 3, wherein an inlet / outlet port is opened.