JPH0112037Y2 - - Google Patents

Description

[Detailed explanation of the idea] The present invention relates to a flow control solenoid valve.

A flow rate control solenoid valve has a valve body interlocked with a sliding plunger that is excited by an electromagnet, and the valve body slides inside a guide sleeve to control the flow rate. The disadvantage of this type of valve is that it has large sliding resistance, increases the size of the electromagnet, and requires a coil spring in addition to the valve body and guide sleeve, making it expensive.

Therefore, it is an object of the present invention to provide a flow rate control solenoid valve that eliminates this problem by utilizing a valve body that controls the flow rate by changing the pitch of a coil spring, as disclosed in Japanese Patent Application Laid-Open No. 70917/1983.

In order to achieve this object, the present invention provides a flow path 4 equipped with connection ports 4a and 4c that open in intersecting directions.
A plunger 2 that slides when excited by an electromagnet 1, and a resilient coil spring 3 whose one end is closed by the plunger 2 and whose path is the other end and the pitch interval are provided in a casing A. , the other end of the coil spring is placed on a seat 4b formed in one connection port 4a of the flow path 4, and the plunger 2 is connected to a plunger extending beyond the other connection port 4c of the flow path 4. It is fitted into the insertion tube 4d.

In the illustrated example, the electromagnet 1 is inserted into the insertion tube 4d.
It was set up so as to surround the outer periphery of.

Since the present invention is constructed as described above, the first
As shown in the figure, the fluid in the flow path 4 flows between the pitch intervals and the other end of the coil spring 3 as a passage, but when the electromagnet 1 is excited, the plunger 2 flows as shown in FIG.
When the coil spring 3 is compressed, the flow rate of the fluid becomes regulated by the narrowed pitch interval of the coil spring 3. That is, the flow rate is regulated by the pitch interval of the coil spring 3, which is compressed in response to changes in the current applied to the electromagnet 1.

In this way, according to the present invention, a plunger 2 that is magnetized by an electromagnet 1 and slides inside a cylinder A provided with a flow path 4 and provided with connection ports 4a and 4c that open in intersecting directions; A resilient coil spring 3 is provided, whose inner diameter is closed at one end by the plunger 2, and whose passage is the other end of the inner diameter and the pitch interval. A seat portion 4b formed at one connection port 4a of the flow path 4
At the same time, the plunger 2 is inserted into a plunger insertion tube 4d extending beyond the other connection port 4c of the passage 4, thereby controlling the flow rate by changing the pitch interval using the spring. A flow rate control solenoid valve is obtained, and the flow rate can be easily controlled without requiring parts such as a valve body or a guide sleeve as in the conventional example described above.Moreover, the coil spring 3 can return the plunger 2 to its original position. Since it also functions as a spring for returning, there is no need to provide a separate return spring, which reduces the number of parts.Furthermore, since the drive unit consisting of the coil spring and plunger 2 is housed in the casing A, only one part of the drive unit can be used. Compared to a device in which the device protrudes outside the casing, there is less sliding resistance, sealing, etc. is easier, and the entire device can be made smaller.

[Brief explanation of the drawing]

The drawings show one embodiment of the present invention; FIG. 1 is a sectional view showing the inactive state, and FIG. 2 is a sectional view showing the operating state. 1...Electromagnet, 2...Plunger, 3...Coil spring.

Claims (1)

[Scope of utility model registration request] A plunger 2 that slides when excited by an electromagnet 1 is disposed in a housing A provided with a flow path 4 having connection ports 4a and 4c that open in intersecting directions;
A resilient coil spring 3 is provided, one end of which is closed, and the other end and the pitch interval serve as a passage, and the other end of the coil spring is a seat portion 4b formed at one connection port 4a of the flow path 4. The flow rate control solenoid valve is constructed by placing the plunger 2 in a plunger insertion tube 4d extending beyond the other connection port 4c of the flow path 4.