JPH0432267B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Technical Field The present invention relates to an improvement in a three-way valve that is used, for example, in a compressor of a variable capacity type vehicle air conditioner and selectively supplies high pressure and low pressure to one pressure supply target device. It is something.

Prior Art Various types of three-way valves have been proposed, and FIG. 1 shows a sectional view of a conventional three-way valve, which is the subject of the present invention. The core 7 is fitted into the cylinder 6, and the hollow plunger 10 is loosely fitted into the cylinder 6.
A spring 12 is inserted into the plunger 10 and applies an urging force to press the valve elements 11 and 13, whose movement in the axial direction is restricted by the flanges provided at both ends of the plunger 10, against the flanges. Said cylinder 6
Screw or insert the flanges 1 and 2 on both ends of the
A nozzle 9 is inserted into the flange 2 on the side where the plunger 10 is loosely fitted, and when the electromagnetic coil 16 fitted on the outer periphery of the cylinder does not operate, the valve 13 provided on the end face of the plunger 10 is always inserted into the nozzle. A biasing force is applied by a spring 14 so as to be pressed against 9. In such a valve, the gap t between the plunger 10 and the core 7 is the plunger installation dimension l1, the plunger dimension l2, the dimension a from the cylinder end face to the core, the dimension b from the cylinder end face to the brim, and the dimension from the flange end face to the nozzle. c,
Assuming plunger body length d and plunger claw thickness e, t=l1-l2 l1=a-b+c l2=d-e t=a-b+c-(d-e), and the maximum value of the gap t is the standard dimension. When the sum of the dimensional tolerances at five locations is the maximum value, the coil capacity is the same as the spring 1 even when the gap t is the maximum.
2 and 14 to bring the core 7 and plunger 10 into sufficient contact with each other, the larger the tolerance, the larger the capacity of the electromagnetic coil 1.
In order to reduce the capacity of the electromagnetic coil 16, weakening the springs 12 and 14 will cause vibrations. It has the disadvantage that resonance is likely to occur when the current is applied.

Purpose of the Invention In the present invention, by reducing the tolerance width of the gap t, the maximum stroke of the plunger is reduced, and the capacity of the electromagnetic coil is reduced without weakening the spring, thereby reducing power consumption and reducing vibration in the device. An object of the present invention is to provide a three-way valve that does not easily cause resonance even when the valve is bent.

Structure of the Invention In order to reduce the maximum value of the gap t between the plunger and the core, the nozzle member is formed into a flat plate, and is sandwiched between the flange and the cylinder, and the nozzle end is configured by an annular groove of the flat plate member, The surfaces of the nozzle members other than the nozzle end are in surface contact with the end face of the plunger when the electromagnetic coil is not activated, and the valve element loosely fitted in the plunger is in contact with the end face of the plunger when the nozzle member is separated from the end face of the plunger due to the biasing force of the spring inside the plunger. ,
The upper surface of the valve element is provided so as to slightly protrude from the end surface of the plunger.

With the above configuration, the gap t between the plunger and the core becomes t=A-B, where A is the distance from the cylinder end face to the core end face, and B is the plunger length, and can be set using two dimensions, A and B. , it is possible to reduce the influence of dimensional tolerances.

Embodiment FIG. 2 shows an electromagnetic coil 1 in an embodiment of the present invention.
6 is not in operation, and will be described below with reference to the figures.

In the figure, 1 and 2 are flanges, flange 1 has a first passage 3, and flange 2 has a second passage 4.
A third passage 5 is opened, the flanges 1 and 2 are fitted on both ends of the cylinder 6, and the flange 2 clamps the flat nozzle member 9 between the ends of the cylinder 6. It is screwed onto the cylinder 6 as shown in FIG. An electromagnetic coil 1 is attached to the outer circumference of the cylinder 6.
A core 7 is press-fitted into the cylinder 6 on the flange 1 side, a valve seat 8 is formed on the flange 2 side of the core 7, and a passage communicates between the first passage 3 and the inside of the cylinder 6 in the axial direction. has. Furthermore, plunger 10
is loosely fitted into the cylinder 6, and the spring 14
A biasing force is applied to press the nozzle surface. Further, the plunger 10 has a space in the internal axial direction, and valves 11 and 13 whose outward movement in the axial direction is regulated by flanges provided at both ends of the space, and the valves 11 and 13 are moved between the valves 11 and 13 by the flanges provided at both ends of the space. A spring 12 is inserted that provides a biasing force to press the . Said valve 13
is a convex valve, and when the plunger 10 is apart from the nozzle member 9, the upper end surface is the same as the plunger 1.
It has a shape that slightly protrudes from the end surface of 0. The nozzle member 90 has a nozzle end 92 formed by an annular groove 91.
is formed. The present embodiment is configured as described above, and when the electromagnetic coil 16 is not in operation, the end face of the nozzle member 90 and the end face of the plunger 10 come into surface contact with each other due to the biasing force from the spring 14. The valve element 13 slightly protruding from the plunger 10 is pressed by the nozzle end 92 provided on the nozzle member 90, thereby compressing the spring 12 and forming the same surface as the end face of the plunger. 4 is closed, and the first passage 3 and the third passage 5 are communicated with each other. When the electromagnetic coil 16 is in operation, the plunger 10 is in close contact with the core 7, the valve seat 8 is pressed against the valve element 11, and the first passage 3
is closed, and the second passage 4 and third passage 5 are communicated with each other.

Effects of the invention By fixing the nozzle end face on the same plane as the cylinder end face, the gap t between the plunger and the core can be determined by the difference between the distance A between the cylinder end face and the core end face and the plunger length B, and the tolerance of the gap t The factors that affect the magnetic field are reduced, the maximum gap can be reduced, and the attraction force of the electromagnetic coil can be suppressed to the minimum necessary, which is effective in downsizing the electromagnetic coil and reducing power consumption. Since they are in contact, they are less likely to resonate due to vibrations.

[Brief explanation of drawings]

FIG. 1 shows a sectional view of a conventional device, and FIG. 2 shows a sectional view of an embodiment of the present invention. 1...Flange, 2...Flange, 6...Cylinder,
7... Core, 9... Nozzle member, 10... Plunger,
13... Valve, 90... Nozzle member, 91... Annular groove,
92...Nozzle end.

Claims (1)

[Claims] 1 In a cylinder in which a first passage and a second passage are provided at both ends of the cylinder, and a third passage is provided in the side wall,
A plunger that selectively closes either the first passage or the second passage is loosely fitted, the plunger is biased in one direction by a spring, and an electromagnetic coil is fitted on the outer periphery of the cylinder. In the valve, an upper surface of a sealing member, which is a valve element, is disposed on the end surface of the plunger so as to be retractable and slightly protrude from the end surface of the plunger, and a nozzle member corresponding to the sealing member has a flat plate shape, and an annular shape is provided on the flat plate surface. A three-way valve characterized in that the nozzle end is formed by carving a groove.