JPH0218863Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to an electromagnetic negative pressure control valve.

Conventionally, various types of electromagnetic negative pressure control valves have been proposed as valves that proportionally control the output negative pressure using electric signals, but all of these valves have limited output negative pressure that is controlled according to the product size. The pressure was low.

An object of the present invention is to provide an electromagnetic negative pressure control valve that is compact and capable of obtaining high output negative pressure by having a compact valve section.

In order to achieve this objective, the present invention has a valve body having a negative pressure input port, an atmospheric input port, and an output port, a cup-shaped plunger disposed within the body, and a cup-shaped plunger that is fitted into the mouth of the plunger and integrated into the valve body. a non-magnetic sheet member, which is fixed to the plunger and has an opening on its side surface, and has an inner circumferential portion of a diaphragm whose outer circumferential portion is fixed to the body, and has an opening on a side surface; a poppet valve biased by a spring so as to come into contact with the valve seat of the formed negative pressure input port; a solenoid portion disposed coaxially with the plunger and controlled to be excited in accordance with an electric signal; and an axis of the solenoid portion. an adjuster steering core disposed at the center to be movable in the axial direction opposite to the plunger and adjusting the initial gear length with the plunger; fixing the body and the solenoid portion; and a magnetic circuit for the plunger, the solenoid, and the core. In the electromagnetic negative pressure control valve comprising a yoke member that also serves as a bracket, the plunger is press-molded and has a flange portion on a side surface,
The non-magnetic sheet member is also molded into a cup shape and press-formed, and the inner peripheral part of the diaphragm is baked and fixed to the outer peripheral surface, and the side surface is connected to the atmospheric air input port. The poppet valve can be brought into contact with the valve seat surface of the poppet valve, and the poppet valve is made of a non-metallic molded product and is biased to come into contact with the valve seat with a relatively light force. The atmosphere from the atmosphere input port is connected to the output port, but when current flows through the solenoid, the plunger is attracted to the core and moves, and eventually the poppet valve comes into contact with the side of the non-magnetic sheet member, causing the atmosphere to flow through the output port. The passage is closed, and the poppet valve is moved by being pushed against the side surface of the non-magnetic sheet member to open the valve seat of the negative pressure input port, and negative pressure is introduced into the output port.

As a result, the negative pressure side chamber of the diaphragm changes from atmospheric pressure to negative pressure, so the diaphragm pulls the plunger toward the negative pressure side chamber overcoming the suction force with the core, and the poppet valve pulls the valve seat of the negative pressure input port. closes and opens the atmospheric passage, allowing atmospheric air to flow to the output port. The above operation is repeated so that the current applied to the solenoid section, that is, the electromagnetic force, and the negative pressure generated by the diaphragm are balanced. When the electromagnetic force and negative pressure are balanced, both the atmospheric and negative pressure valves are closed and a constant negative pressure value is maintained, so the output negative pressure can be proportionally controlled according to the current.

As described above, the plunger and non-magnetic sheet member of the present invention are press-molded and thin-walled, so they can be constructed compactly, and the plunger and non-magnetic sheet member are press-formed and can be cut. Since the diaphragm's inner circumference is baked and fixed to the outer circumferential surface of the non-magnetic sheet member, and the poppet valve is made of a non-metallic molded product, Since it is urged to contact the valve seat with a relatively light force (installation load of about 15g or less), the valve part can be configured very compactly, and the effective area of the diaphragm can also be made smaller. , it is possible to obtain high output negative pressure with an ultra-small size, and it is possible to significantly reduce costs.

An embodiment of the present invention will be described below with reference to the drawings. The figure is a side sectional view of an electromagnetic negative pressure control valve showing an embodiment of the present invention. In the figure, a bobbin 2 made of resin is fitted around the outer periphery of an adjusting core 1 made of a magnetic material, and a solenoid coil 3 connected to an appropriate power source is wound on the bobbin 2. Further, the outer yoke 4 and the plate yoke 5 made of magnetic material, the core 1, and the coil 3 constitute an electromagnet section whose excitation is controlled according to an electric signal, and the coupling of the electromagnet section to the valve body 6 is as follows. This is achieved by the yokes 4 and 5 and the connecting member 7.

A negative pressure input port 8, an atmospheric input port 9, and an output port 10 are formed in the valve body 6. Also, inside the valve body 6, a cup-shaped plunger 11 is provided with a spring 1 attached to the core 1.
The plunger 11 is press-molded to have a thin wall, and has a chamber 13 connected to the atmospheric input port 9 on its outer periphery. An atmospheric hole 14 is provided which communicates through the air hole 14 . 15 is core 1
a spacer covering the end face on the plunger 11 side, 1
6 and 17 are O-rings. Further, the axial position of the adjusting core 1 is adjusted through the groove 18 during assembly.

Reference numeral 19 denotes an orifice member which presses and fixes the outer peripheral portion of the diaphragm 21 into the groove of the valve body 6. Reference numeral 20 is a non-magnetic sheet member fitted and fixed to the mouth of the plunger 11 and formed into a cup shape, the side surface of which can come into contact with the valve seat surface of the poppet valve 23 and is introduced into the output port 10. It has an opening, and the inner peripheral part of the diaphragm 21 is fixed to the outer peripheral surface by baking. The poppet valve 23 is a molded product made of a non-metallic material, and is biased by a spring 22 so that the valve seat surface comes into contact with the valve seat of the negative pressure input port 8. Further, a chamber 24 communicating with the output port 10 is provided on the left side of the diaphragm 21 .

Next, to explain the function, normally the atmosphere input port 9 leads to the chamber 13, the atmosphere hole 14, and the non-magnetic sheet member 2.
Atmospheric air flows into the output port 10 through the opening in the side of 0 and the chamber 24 .

When current is passed through solenoid coil 3,
When the core 1 is excited, the spring 12
The plunger 11 is sucked against the force. When the plunger 11 is attracted and moves to the right, the non-magnetic sheet member 20 also moves to the right, and its side surface comes into contact with the valve seat surface of the poppet valve 23, closing the opening. The influx of will stop.

When the non-magnetic sheet member 20 further moves to the right, its side pushes the poppet valve 23 to the right, so that the valve seat of the negative pressure input port 8 and the valve seat surface of the poppet valve 23 are separated from each other, and the negative Pressure is introduced into output port 10 via chamber 24 . Chamber 2 like this
When 4 becomes negative pressure, chamber 13 is at atmospheric pressure, so
The diaphragm 21 moves to the left and the plunger 1
The non-magnetic sheet member 20 is moved to the left against the attraction force of 1.

Therefore, the valve seat of the negative pressure input port 8 is closed by the poppet valve 23, the atmosphere flows into the chamber 24, the negative pressure acting on the diaphragm 21 is weakened, and the plunger 11 is drawn into the core 1 again.
The above operations are repeated in sequence, and the output port 10 is always controlled to a negative pressure according to the electromagnetic force, that is, the applied current value.

[Brief explanation of the drawing]

The drawing is a side sectional view of an electromagnetic negative pressure control valve showing an embodiment of the present invention. Explanation of the main parts of the diagram, 1...Adjusting core, 2...Bobbin, 3...Solenoid coil,
4...Outer yoke, 5...Plate yoke, 6...
...Valve body, 8... Negative pressure input port, 9...
Atmospheric input port, 10... Output port, 11...
Plunger, 12...spring. 13, 24...
...Chamber, 14...Air hole, 20...Nonmagnetic sheet member, 21...Diaphragm, 22...Spring, 23...Poppet valve.

Claims (1)

[Scope of utility model registration request] A valve body having a negative pressure input port, an atmospheric input port, and an output port, a cup-shaped plunger disposed within the body, the valve body being fitted into the mouth of the plunger and fixed integrally, and having the above-mentioned A non-magnetic sheet member to which the inner circumference of a diaphragm whose outer circumference is fixed to the body and has an opening on the side surface is disposed within the plunger and is attached to a valve seat of a negative pressure input port formed in the valve body. a poppet valve urged by a spring to abut against the plunger; a solenoid section disposed coaxially with the plunger and controlled to excite in response to an electric signal; an adjusting core that is movably arranged to adjust the initial gap length with the plunger; a yoke member that also serves as a bracket for fixing the body and the solenoid part and forming a magnetic circuit for the plunger, the solenoid part, and the core; In the electromagnetic negative pressure control valve, the plunger is press-molded and has an atmospheric hole in its outer periphery that communicates with the atmospheric input port, and the non-magnetic sheet member is also formed into a cup shape and press-molded. and the inner peripheral part of the diaphragm is baked and fixed to the outer peripheral surface, and the side surface can come into contact with the valve seat surface of the poppet valve, and the poppet valve is constructed of a non-metal molded product and is relatively An electromagnetic negative pressure control valve characterized in that it is biased to contact the valve seat with a light force.