JPS5821070A - Port switching solenoid valve - Google Patents

Abstract

PURPOSE:To dispense with precise finishing work of components by arranging a valve body which accomodates a spool and a valve seat, in a composition of two divid halves, in such a way as combining one valve body half with the other half, while adjusting the position of a valve seat during visual recognition of the relative position between these halves. CONSTITUTION:When two valve body halves 10a, 10b are combined, an inflow pipe 20 is pressed into a port P, located in a central position of a valve hole half 12a of one valve body half 10a, and an internal valve seat block 17 is fixed to the valve body half 10a. Subsequently, the position of a spool 15 in the valve hole half 12a of an external valve seat block 18 is adjusted. Then, the valve body half 10a is combined fluid-tight with the other valve body half 10b by means of a bolt and the like through a packing 22, while an end board 13 is connected fluid tight to one end of a valve body 10 through a packing 22, and further an electromagnet 11 is connected to the other end.

Description

[Detailed description of the invention]

The present invention relates to a 9J exchange solenoid valve. An example of a conventional boat switching solenoid valve is the one shown in Figure 1. The illustrated boat switching solenoid valve is a spool valve Je that is slidably installed in the valve hole of the valve body I.
&, the spool valve J has two land valves, j,
Metom and B connected to the actuator, L and P connected to the fluid source, and the tank! A drain &-) T is provided on the valve body I, and when the electromagnet 4 is energized, the spool valve J moves against the biasing force of the return spring 7, and the land of the spool valve J is moved.
! The configuration is such that one of Metom, B is switched to the boat P, and the other is connected to &-)T depending on the position of the boat. However, in such a conventional #Bow F switching solenoid valve, in order to ensure the switching of If the diameter of each hole is not precisely manufactured, for example, as shown in Fig. 1, the land 3 will cut off the communication between the boat T and the boat B, and the land I will be connected to the boat B &-).
Even if you switch the spool valve Jt to the position that cuts off communication with P. Liquid leaks from the gap between the land and the valve hole, making sure the boat is l! Since it is not often possible to carry out inspections, it is necessary to strictly set the clearance between the diameter of the valve hole and the diameter of the land, which results in a very high cost. The present invention has been made by focusing on one point in contrast to the conventional art, and the valve body is made into a bipartite imm structure, and when the two valve body halves are assembled, the inside of the valve hole half of one valve body half is removed. The above problem is solved by configuring the valve seat so that it can be freely adjusted in a position that produces the desired action while visually confirming the line of contact between the valve seat and the valve plate of the spool. The purpose is to Hereinafter, the present invention will be explained based on the drawings. 2 and 3 are diagrams showing one embodiment of the present invention. First, the structure will be described. Reference numeral 10 indicates a valve body of the dowel switching solenoid valve according to the present invention, and // indicates a normal electromagnet attached to one part of the valve body 10. The valve body has a valve hole, and an actuator such as a flow rate needle is connected to this valve hole.

(not shown), a boat p connected to a fluid source, and a drain gate T and e connected to a tank. 11 According to the present invention, the valve body is divided into two parts, for example, as shown in FIG.
Open &-)P in the axial center of the valve body half 10
Bottom and B are placed at positions spaced inwardly and outwardly from the center of the valve hole half portion txb of b, respectively. The valve body 1017) on the side opposite to the electromagnet // is provided with a tail plate /J attached to the valve body 1017), and the valve hole /2 is opened in the same ring shape. The X pool 7B has two valve plates made of elastic material such as rubber.
la, /lb @Fixed by snap cylinders t4a and lib at positions spaced apart from each other in the axial direction. In the valve hole 12, there are two valve plates /#&, /Ib lia and Ili! of spool lj. I, valve plate/la
, a hollow cylindrical inner valve seat block /7 having annular inner valves /7a, /7b on both sides in the axial direction, to which the inner end surfaces of the valve plates zaa,
Two outer valve dust blocks lI are arranged outside of nb and have annular outer valves ml /j&, /Ib with which the outer end surfaces of each valve plate abut. These outer valve seat blocks lz4+: formed center hole/denihide spool l! It is inserted freely and supported so that it can slide freely. However, in this specification - "
The terms "inside" and "outside" refer to the side closest to the center of the valve body in the axial direction as "inside" and the side far away from the center of the valve body as "outside." According to the illustrated embodiment, two valve body halves 10h elo
When assembling parts b, press fit the inflow pipe There is also an inflow pipe
is press-fitted, thus causing the inflow pipe to act as a positioning pin to fix the inner valve seat block/7 to the valve body half 10IL.@ Next, when sliding the spool/j in one direction, one valve plate, For example, the outer 11g111 surface of the valve plate/IIL is in contact with the outer valve seat/111 of one outer valve seat block/l, and the inner surface of the valve plate l-a is the inner valve seat of the inner valve dust block/7. 77a to ■, the inner end surface of the other valve plate l comes into contact with the inner valve 11nb of the inner valve seat block n, and the outer end surface of the valve plate l is in contact with the outer side of the other valve seat block/l. When sliding the spool /j in the opposite direction so that it separates from the outer valve seat tzb, the inner ttim surface of the valve plate 1a touches the inner valve seat of the inner valve seat block /7. a, and outside the valve plate l reference a @! 21II surface is separated from the outer valve seat lIa of one outer valve seat block /l, and the outer iI trend surface of the other valve plate l comes into contact with the outer valve Ill/Kb of the other outer valve seat plotter n. , and the inner end surface of the valve plate tab is the inner valve seat block/? Inner valve of @n
The valve hole half l of each outer valve seat block is spaced apart from b.
Adjust the position in la, and fix to the valve body half 10& by caulking or the like at each adjusted position. After this adjustment, the other valve body half tMl^ is fluid-tightly assembled to the valve body half 10& with bolts etc. via the para-middle n, and the valve body 10
An end plate 13 is fluid-tightly connected to one end of the magnet via a parallel pin JJI, and an electromagnet // is fluid-tightly connected to the opposite end. Outer valve seat of Gaiki Benho Block II/j! , A counterbore with a diameter larger than the center hole is formed at the end on the lTo side, and an annular hole is formed between it and the spool /3. Furthermore, a through hole n is formed in the spool lj, and this through hole n is communicated with the drain boat T of the valve body 10. 1. ' Horizontal holes x and JJ communicating with this through hole n are formed on the outside of the valve plates /I& and nb of the spool, respectively. The return spring l placed on the svA of the spool /j on the side of the electromagnet // pushes the normal spool lS to the right position shown in the figure, and the fluid source connection &-) P communicates with the actuator connection terminal tom, and the actuator B The spool ls is held in a position where it communicates with the drain mate T. Next, the above! The operation of the solenoid valve will be explained below. When the electromagnet 11 is off, as described above, due to the spring force of the 13-turn spring 1, the outer end surface of the valve plate 1 contacts the outer valve @/g&, and the inner li end surface of the valve plate 4a contacts the inner valve @m. At the same time, the inner end surface of the valve plate tub comes into contact with the inner valve @ /7b, and the outer end surface of the valve plate l contacts the inner valve @ /7b.
The surface is spaced apart from the outer valve *txb. Therefore, fluid source connection &-) P to internal valve seat block/? The fluid flowing into the hollow internal space through the horizontal hole 1 flows into the space inside the valve hole lλ through the gap between the inner glans surface of the valve plate l and the internal valve seat 77, and then flows into the space inside the valve hole l Through the boat, the liquid flows into an inlet (not shown) of an actuator, such as a flow needle.゛The fluid discharged from the discharge port of this actuator and flowing into the actuator connection boat H must pass through the space inside the valve hole L and the outer surface of the valve L and the outer surface of the outer valve II/Ib, and then flow to the outside. It flows into the annular space b of the valve seat block it, then flows into the through hole n of the spool 110 via the horizontal hole B of the spool lj, and is then discharged to the drainmate T. On the other hand, when the electromagnet // is on, the spool /j moves to the left in FIG. The inner end surface of the valve plate/-b moves away from the inner valve @nb, and the inner side m [Il of the valve plate/Ia moves away from the inner valve @nb.
7a, and the outer side 12II1 of the valve plate 1 is spaced apart from the outer valve @ tlh is. Therefore fluid #I! lI
Continuation &-) Fluid flowing from P into the internal space of the inner valve seat/7b passes through the air between the valve fi tab and the inner valve seat/7b, flows to the actuator connection boat B, and returns to the original discharge of the actuator. The fluid directed to the outlet (illff not shown) and discharged from the original outlet of the actuator enters the actuator connecting boat and then passes through the gap between the valve plate la and the outer valve seat/fa into the annular space. Xa, further passes through the horizontal hole S1 through hole n formed in the spool lj, and is returned to the tank by the drain &- Since the position can be adjusted while visually checking, there is no need to strictly set the clearance between the valve plate and the valve seat, and costs can be significantly reduced. In addition, although the above-mentioned actual jlIfR has been described with respect to a switching solenoid valve with one boat, the present invention is not limited to this and can be applied to a switching solenoid valve with even more boats. As explained above, according to the present invention, the valve body has a bipartite structure that accommodates the spool and the valve seat, and the positions of the valve plate of the spool and the valve seat are located within the early part of the valve hole of one half of the valve body. Since the position of the valve seat can be adjusted while visually confirming the relationship, and the other half of the valve body is assembled after adjustment, there is no need to strictly finish the accuracy of each component, and the position of the valve seat can be easily adjusted. This can be done easily and reliably, and it is possible to provide an inexpensive directional control valve that operates reliably. By making the blind valve plate an elastic body, the inner valve w of the valve plate
Since the position of the valve seat or the outside valve dust is adjusted by absorbing the adjustment error of the valve seat position, it is not necessary to adjust the valve seat mounting position as strictly as possible, and the adjustment becomes easier.

[Brief explanation of the drawing]

Figure 1 is a diagrammatic longitudinal cross-sectional view of a conventional 1m-)
Figure 2 is a longitudinal cross-sectional view of an embodiment of the Mei IJ solenoid valve according to the present invention, and Figure 2 is an exploded perspective view of the valve body of the device shown in Figure 2. ◎ 10 ... Valve body, 10! h5) ob-... Valve body half, tl-... Electromagnet, /J... Valve hole, zaa,
tJb-... Valve hole half, /J... End plate, l reference a
, nb--valve plate, tk----2 pool, /7 ・
・Inside・'Valve seat pua tsua, #a, nb-*e
Inside story benten, /I-...outside ts+m-t. Ivy, /j&, /Ib...Outer valve seat, 1...Inflow, pipe, I...Inner side hole of valve seat block, u, a'.
・Putskin, n...-Through hole in sp-, Jl,, Z
j... II hole of spool, xb... Annular space, l... Return splicida, B... Actuator connection boat, P... Fluid source connection port, T...
・Drainmate・ Figure 1 Figure 2

Claims (1)

[Claims] L: A valve body, a spool that is slidably housed in a valve hole formed in the valve body and is biased in one direction by a spring, and a spool that resists the biasing force of the spring. an electromagnet connected to the actuator, a boat connected to a fluid source, a drainmate connected to a tank, and at least two electromagnets connected to the actuator by movement of the spool; and %J
at least two spools disposed in relation to the axial direction of the spool so as to communicate at least one of the boats with the boat connected to the fluid source and the remaining boats with the drain boat; a boat switching solenoid valve comprising: one valve body half that is fluid-tightly combined with each other to form the valve body; and one valve body half when the two valve body halves are combined. Two or more inner valve dusts fixed at predetermined positions within the valve hole half of the half, and a position where the other surface of the valve plate faces the inner valve dust and abuts to produce a desired action within the valve hole half. A mate switching solenoid valve, characterized in that it has at least one pair of outer valve slippers that can be adjustably attached to the valve. 2. The mate switching solenoid/valve according to claim 1, wherein the valve plate has elasticity.