JPS5856460Y2 - Teiriyuriyougatadenjiben - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a constant flow solenoid valve that maintains a constant flow rate of fluid supplied.

Conventionally used solenoid valves include:
As shown in Figure 1, there is a body 2 that has a hole 1 that matches the required flow rate and opens and closes this hole 1 with a valve body 3, but the dimensions of the hole 1 are calculated for each specified flow rate and adjusted accordingly. Since the holes must be made with a drill, the dimensional accuracy of the holes is poor due to the rotational speed of the drill and center runout, and if the body is made of die-casting, there is a risk of so-called leakage due to cutting.

On the other hand, as shown in Figure 2, some products have the hole 4 pre-drilled to a larger size, adjust the opening of this hole with the needle 5, and then lock and deliver it to the user, but while this has the advantage of being adjustable, Even if it is locked, there is a risk that the adjustment value may be distorted due to vibration or shock during transportation, and there is little need for the user to readjust it, so this adjustment function is practically used at the place of use during the period of use. Otherwise, it would be extremely wasteful in terms of cost.

Therefore, an object of the present invention is to provide an inexpensive solenoid valve that can easily and accurately obtain a desired flow rate, and that once assembled, the set flow rate does not change unless parts are replaced.
The object of the present invention is to provide a constant flow type solenoid valve that has a simple structure and can easily and reliably install a required flow rate.

The present invention is a plan in which a flow rate regulating plate with pores is placed in the fluid passage, and this is fixed in position with a valve seat that also serves as a gasket and a retaining ring, and has an end that abuts against the valve seat. The jar is used as the valve member to reduce the number of parts, and the flow rate regulating plate is appropriately selected from various pore sizes and positioned and fixed to obtain the required flow rate.

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 3 is a longitudinal sectional view of the solenoid valve of the present invention.

A cylindrical valve chamber is formed in the valve body 6 in the axial direction of the body.

The valve body is provided with a relatively large-diameter inflow passage 8 coaxially communicating with the valve chamber at the bottom of the valve chamber, and an outflow passage 9 communicating with the discharge port from the side wall of the lower portion of the valve chamber.

The inlet passage 8 is a blind hole connected to a supply fluid introduction passage above its bottom surface, and fluid is supplied from this introduction passage as shown by the arrow.

At the bottom of the valve chamber 7, a thin disk 11 having a pore 10 is placed.
A substantially ring-shaped valve seat 12 which also serves as a backing is fitted onto it, and a ring-shaped retaining ring 13 is further fitted from above for individualization.

The pore 10 at the center of the disk 11 is for setting the supply flow rate, and a plurality of types of disks with different hole diameters are prepared in advance, and the disk with the desired flow rate is installed. .

The valve seat 12 is made of a rubber material to prevent fluid from leaking from places other than the flow rate regulating hole 10, and a raised part 15 is formed on the upper edge of the central fluid circulation hole 14 so that the upper surface of the raised part is flat. The valve seat surface is

The retaining ring 13 is made to pass through the raised portion through a hole in the center, and has a large number of pawls 16 on its outer periphery, and when installed, the disc 11 and the valve seat are placed between the retaining ring 13 and the body at the bottom of the valve chamber. 12 is clamped so that it cannot be easily removed once installed.

The lower surface 18 of the plunger 17 also functions as a valve body, so when the solenoid 19 is energized, the plunger 17 is attracted to the fixed core 20, and the lower surface 18 of the plunger is separated from the raised portion 15 as shown in the figure. Inlet channel 8 and outlet channel 9
Open the flow path between.

On the other hand, when the power to the solenoid 19 is cut off, the coil spring 21
The plunger is lowered by the spring pressure, and its lower surface 18 comes into contact with the seat portion 15, closing the flow path.

When this electromagnetic valve is used to control liquid, the lower side of the pore 10 is set as the inflow side as shown in the figure, and the introduction path connects to the inflow path 8 above its bottom surface, forming a recess 22 below it. Therefore, dust etc. settles in the recess 22, so the pore 10
clogging can be prevented.

As mentioned above, according to the present invention, since the holes for flow rate regulation are made in a thin plate, the dimensional accuracy of the holes is significantly improved, and the desired flow rate can be obtained, which is particularly effective for controlling small flow rates. .

Discs are simply made by drilling small holes in a thin plate, and we can prepare a variety of discs with different hole sizes, so when we deliver the same body, we use discs with hole diameters that match the set flow rate. It is only necessary to select a valve and fix it together with a valve seat using a built-in retaining ring, making it possible to easily provide electromagnetic valves with various flow rates.

Furthermore, there is no need to perform troublesome and time-consuming flow rate adjustment after assembly, and there is no fear that the set value will be distorted due to vibration or the like after assembly.

Furthermore, the circular plate with holes is easy to manufacture, and since it serves both as a valve seat and a backing, the number of parts is reduced, and the plunger itself can be used directly as a valve member, leading to cost reduction.

[Brief explanation of the drawing]

1 and 2 are sectional views of the main parts of a conventional constant flow solenoid valve, and FIG. 3 is a longitudinal sectional view of a constant flow solenoid valve according to the present invention. In the figure, 7 is a valve chamber, 8 is an inflow path, 9 is an outflow path, and 10
is a pore, 11 is a disk, 12 is a valve seat, 13 is a retaining ring,
15 is a protuberance, 17 is a plunger, and 19 is a solenoid.

Claims (1)

[Scope of Claim for Utility Model Registration] A constant flow solenoid valve that has a flow rate regulating hole between the suction port and the discharge port, and opens and closes the flow path between the suction port and the discharge port by electromagnetic action. , a cylindrical valve chamber provided in the axial direction, an inflow path provided coaxially with the valve chamber below the valve chamber, and communicating the inflow path and the suction port above the bottom surface of the inflow path. an inlet passage; an outflow passage communicating with the discharge port above the bottom surface of the valve chamber;
a circular flow rate regulating thin plate having a flow rate regulating pore approximately in the center and disposed at the bottom of the valve chamber so that the pore communicates with the inflow passage; overlapping the flow rate regulating thin plate; The holes are arranged adjacent to each other and have an opening communicating with the pore, and the opening of the opening is on a raised flat surface at the center opposite to the regulating thin plate, and only the pore of the thin plate is provided. a valve seat that also serves as a packing so as to communicate with the valve chamber; with the flow rate regulating thin plate and the valve seat overlapped, and with the raised flat surface portion of the valve seat passing through the central opening; a ring-shaped retaining ring for fixing to the bottom portion; a retaining ring having a plurality of protrusions arranged at intervals around the outer periphery so as to engage with the side wall of the valve chamber; surface contact with the valve seat by actuation of an electromagnetic coil; a plunger having an end adapted to close or open an opening in the valve seat;