JPH0322611Y2 - - Google Patents

Description

[Detailed description of the invention] [Purpose of the invention] Industrial application field The present invention relates to a solenoid valve for controlling the flow of pressurized fluid, and in particular to a reversible solenoid valve that can perform stable control even when the flow direction is reversed. Regarding valves.

2. Description of the Related Art Electromagnetic valves are often used in refrigerant circuits of air conditioners due to their ease of control. Among these, in air conditioners that switch between cooling and heating, the flow direction of the refrigerant is reversed by switching, so it is desirable that the solenoid valve for controlling the flow rate of the refrigerant is also reversible.

When an ordinary single-seat solenoid valve is used as such a reversible solenoid valve, the valve body is constantly urged toward the valve seat by a strong spring that prevents it from opening even when reverse pressure is applied. Therefore, depending on the direction of fluid flow, the valve body must be opened against the forces of both the fluid pressure and the spring, and the electromagnetic actuator must be large and powerful. In addition, a double-seat valve, such as the one disclosed in Utility Model Application Publication No. 56-91965 (Fig. 3), has two valve bodies coaxially connected and two valve bodies facing in the same direction. In a solenoid valve that is moved to open and close at the same time with respect to the valve seat, the fluid pressure is balanced, so there is no need for a strong spring to close the valve, and the solenoid actuator has the advantage that it can be small. However, the disadvantage is that the structure is complex and adjustment is difficult.

In addition, first and second valve seats made of a non-magnetic material are fixed to the pipe body with a gap between them, and a ball valve made of a magnetic material is placed in the pipe body between the two valve seats. A reversible magnetic valve in which a magnetic force source having a magnetic axis perpendicular to the axial direction of the tubular body is provided at an intermediate position between both valve seats outside the tubular body so that it can be energized or deenergized in the direction of the magnetic axis. −
152988). However, this has the problem of unstable operation when the flow rate is large, and when the fluid pressure is high, it is difficult to open and close the valve unless the magnetic force source used to attract the ball valve is made extremely strong. Therefore, it was not practical for use in the refrigerant circuit of ordinary air conditioners.

On the other hand, gate valve type solenoid valves, for example,
In the one disclosed in No. 53171 (Figure 4), etc.
Although it is possible to make the electromagnetic actuator small regardless of the flow direction, it has the disadvantage that the size of the port is limited because it cannot have a large lift amount, and it can only be used when the flow rate is small.

Therefore, when the flow rate is large and the flow direction is reversed, a method has been used in which two electromagnetic valves are used in parallel in opposite directions.

Problems to be Solved As described above, using two electromagnetic valves in combination requires a large equipment volume and complicates piping, which is not economical. Therefore, an object of the present invention is to provide a reversible electromagnetic valve that can control a large flow rate using a small electromagnetic actuator.

[Structure of the idea]

Means for Solving the Problems The object of the present invention as described above is to provide a valve main body in which the valve seat surfaces are provided parallel to the opposing inner walls of the valve chamber so that the axes of the ports are the same; a valve body holding means that holds the valve body between the valve seat surfaces so as to be freely movable only in a direction parallel to the axis; and an electromagnetic actuator that can move the valve body holding means only in a direction perpendicular to the axis. This is achieved by a reversible electromagnetic valve that is provided with a valve body and configured such that the center of the valve body is located on the axis at one operating end of the electromagnetic actuator.

The valve body used in the solenoid valve of the present invention is held so that it can move freely toward and away from the valve seat, and is formed so that it can close the port provided in the valve seat. It may also be in the form of a column with both end faces being flat or spherical.

The means for holding the valve body has a shape that does not restrict the valve body from moving in a direction parallel to the axis of the port, but only restricts movement in a direction perpendicular to this. and
For example, it may be in the shape of a frame.

Function In the reversible solenoid valve of the present invention, when fluid flows when the center of the valve body is on the common axis of the ports, the valve body is pushed by the fluid and approaches one of the valve seats. When the port is closed, the pressure difference between the inflow fluid and the outflow fluid causes the fluid to be pressed against the port. When the valve body holding means is moved by the electromagnetic actuator parallel to the valve seat, that is, perpendicularly to the axis common to the two ports, the valve body leaves the position on the axis of the port. opens and fluid flows, the pressure difference between the fluids disappears, and the valve body returns to its floating state.

The operation of such a solenoid valve is exactly the same even if the direction of fluid flow is reversed.

Example Examples of the reversible solenoid valve of the present invention are shown in FIGS. 1 and 2.

1 is a valve body, and valve seats 12 and 13 are provided on opposing inner walls of a valve chamber 11. Ports 14 and 15 are symmetrically formed in the valve seats 12 and 13. 16 and 17 are fluid conduits. 2 is a spherical valve body, 3 is a plunger, 4 is an attractor, and 5 is a solenoid coil.

The plunger 3 is provided with a valve body holding portion 32 following the neck portion 31, and a through hole 33 having a diameter slightly larger than the diameter of the valve body 2 is formed in the valve body holding portion 32. The valve body 2 can freely move in the axial direction within the through hole 33. Further, the neck portion 31 is loosely fitted into the ring-opening stopper 6, and limits the vertical movement range of the plunger 3.

7 is a plunger spring that pushes down the plunger 3, and 8 is a balance spring that pushes back the plunger 3.

In this solenoid valve, when the solenoid coil 5 is not energized, the common axis of the ports 14 and 15 and the axis of the through hole 33 are in the same position.
The center of the valve body 2 is also on these axes, and the valve body 2 is pushed by the inflowing fluid and moves toward the outflow side port. When fluid flows in from the conduit 17 and flows out from the conduit 16, the valve body 2 closes the port 14, but is pressed against the port 14 by the pressure difference between the fluid inflow side and the outflow side, and the valve is closed. maintain the condition.

Next, when the solenoid coil 5 is energized, the plunger 3 is attracted and moves, and stops when it hits the stopper 6. At this time, the valve body 2 is pushed upward and rolled out of the port, allowing the fluid to flow freely.

In the solenoid valve of this example, the plunger 3 does not come into contact with the suction element 4 when the valve is opened or closed, so no suction noise is generated, and the plunger 3 is supported by the plunger spring 7 and the counterbalance spring 8. Therefore, by slowly changing the excitation current to the solenoid coil 5, the valve can be opened and closed slowly.

In the solenoid valve of the present invention, the plunger 3 may be attracted to the attractor 4 without using the stopper 6, and in this case, not only DC operation but also AC operation is possible. Furthermore, by not using the balance spring 8 and using the bottom surface of the valve chamber 11 as a stopper against which the plunger 3 comes into contact, an even simpler structure can be achieved.

[Effect of idea]

The reversible solenoid valve of the present invention has a simple structure, can be driven by a small electromagnetic actuator, and operates reliably in exactly the same way even when the direction of fluid flow changes, without the risk of malfunction. Therefore, the electromagnetic valve itself is small in size, requires less driving power, and has the advantage of being economical.

[Brief explanation of the drawing]

FIG. 1 is a longitudinal sectional view showing the structure of an example of the reversible solenoid valve of the present invention. Figure 2a is a side view of the plunger, Figure 2b is a plan view of the stopper, and Figure 2c is a side view of the plunger.
is a sectional view of the stopper. FIG. 3 is a longitudinal sectional view of an example of a conventional two-seat electromagnetic valve, and FIG. 4 is a longitudinal sectional view of an example of a conventional electromagnetic gate valve. DESCRIPTION OF SYMBOLS 1... Valve body, 11... Valve chamber, 12, 13... Valve seat, 14, 15... Port, 16, 17... Fluid conduit, 2... Valve body, 3... Plunger, 31... Neck,
32...Valve body holding part, 33...Through hole, 4...Suction element, 5
... Solenoid coil, 6... Stopper, 7... Plunger spring, 8... Balance spring.

Claims (1)

[Scope of utility model registration request] The valve body is formed such that the valve seat surfaces are parallel to each other on the opposing inner walls of the valve chamber so that the axes of the ports are the same, and the valve body can freely move only in the direction parallel to the axis between the valve seat surfaces. and an electromagnetic actuator capable of moving the valve body holding means only in a direction perpendicular to the axis,
A reversible electromagnetic valve configured such that the center of the valve body is located on the axis at one operating end of the electromagnetic actuator.