JPS6137509B2 - - Google Patents

Description

[Detailed Description of the Invention] This invention relates to a flow control valve, and more specifically,
The inside of the control unit body is divided into an atmospheric pressure chamber and a negative pressure chamber by a partition, and an atmospheric passage is provided through which the atmosphere and the negative pressure chamber communicate through a valve device, and the opening and closing of this valve device is controlled by the displacement of the mover. A control mechanism is provided on the negative pressure chamber side, and this control mechanism opens and closes the atmospheric passage to introduce atmospheric air into the negative pressure chamber and adjust the pressure inside the negative pressure chamber, thereby controlling the amount of operation of the partition. death,
This relates to a flow control valve in which a valve body is provided on the atmospheric pressure chamber side, which controls the flow area of the fluid passage in the valve box adjacent to the atmospheric pressure chamber by interlocking with the operating amount of the partition, and is particularly applicable to gasoline engines. It is preferably used in exhaust gas recirculation amount control devices, secondary air supply devices, and the like.

Conventionally, this type of flow control valve has, as shown in FIG. The valve body 18 is normally biased toward the valve body 18 by a spring 127. Negative pressure chamber 10 includes mover 126 and control mechanism 2
The atmosphere passage 41 and the communication hole 122 are sealed by a sealing material 30 provided between the bodies 25 of
and communicates with the atmosphere via a filter 116. A pressure regulating valve 114 consisting of a valve seat 113, a pressure regulating valve body 114a and a spring 115 is housed in the internal passage 40, and the pressure regulating valve body 114a is normally seated on the valve seat 113 by the spring 115. 41 is closed, but valve body 1
The pressure regulating valve body 11 is
When 4a is pushed up, the negative pressure chamber 10 can be opened to the atmosphere via the atmospheric passage 41.

However, since the conventional flow control valve is complex and has relatively large moving parts, its control mechanism must be considerably large, which, together with the position of the filter 116, hinders the overall compactness and cost reduction of the device. Ta. Furthermore, since the movable element 126 has a large mass, quick responsiveness cannot be obtained.

In view of the above points, the present invention provides an atmospheric pressure passage within the partition so as to communicate between the atmospheric pressure chamber and the negative pressure chamber, and connects the atmospheric pressure chamber to the negative pressure chamber via a valve device provided in the atmospheric passage. A filter for filtering the air introduced into the atmosphere is provided on the atmospheric pressure chamber side bordering the valve device in the atmospheric passage, and an opening/closing means is provided at the end of the mover so that it can come into contact with the valve device. The purpose is to make the device more compact and improve responsiveness.

Hereinafter, an embodiment embodying the present invention will be described with reference to the drawings. 1 is a valve seat 4 in which an inlet 2 at the lower end and a discharge outlet 3 that is perpendicular to the inlet 2 are connected to a valve seat 4 within the inlet 2. A fluid passage 1a is formed in which the suction port 2 and the discharge port 3 communicate with each other. Reference numeral 5 denotes a control unit body of a flow rate control valve provided adjacently on the valve box 1, and 6 a partition portion in which the inner circumference of a ring-shaped diaphragm 7 is clamped by a pair of upper and lower clamping plates 8 and 9. The two clamping plates 8 and 9 are made separable, and the outer circumferential part of the diaphragm 7 made of rubber or the like is clamped to the inner circumferential part of the control body 5, so that both the upper and lower chambers 10 are connected to the inside of the body 5. , 11.

Reference numeral 12 denotes a valve hole provided through the center of the upper clamping plate 8 of the partition portion 6, and a valve seat 13 is formed at the upper end thereof facing downward. 14 is the partition portion 6
The valve device is normally seated on the valve seat 13 by the biasing force of a spring 15 supported approximately at the center of the lower clamping plate 9; It is a ring-shaped filter that is clamped between 8 and 9, and a filter chamber 17 is formed on its inner and outer peripheries, and the valve hole 12 of the upper clamping plate 8 and the filter chamber 17 are communicated with each other.

Reference numeral 18 denotes a valve body provided downward from approximately the center of the lower clamping plate 9 of the partition portion 6, and is moved up and down by a guide 19 provided at the connecting portion between the valve box 1 and the control body 5. a spring that is guided and inserted into the valve box 1 and supported within the negative pressure chamber 10 that is the upper chamber of the control body 5 so as to bias the upper clamping plate 8 of the partition section 6 downward; 20, which is normally seated against the valve seat 4 within the valve body 1.

Reference numeral 21 denotes a plurality of openings transparently provided in the lower part of the control unit body 5, and the lower chamber 11 in the body 5.
is communicated with the atmosphere to make the lower chamber 11 an atmospheric pressure chamber. Reference numeral 22 denotes a plurality of communication holes transparently provided in the lower clamping plate 9 of the partition section 6, which are connected to the atmospheric pressure chamber 1.
1 and the filter chamber 17 are communicated with each other.

Reference numeral 23 is a conduit connected to the negative pressure chamber 10 of the control unit body 5, and communicates this with a negative pressure source.

Note that the communication hole 22, the filter chamber 17, and the valve hole 12 form an atmospheric passage 6a that communicates the atmospheric pressure chamber 11 and the negative pressure chamber 10.

Reference numeral 24 denotes a control mechanism provided at the upper part of the control unit body 5, which urges the movable element 26 downward by a spring 27 at the upper part of the body 25, and a rod part 26a provided at the end thereof as an opening/closing means. is capable of contacting the valve device 14 of the partition portion 6, and an excitation coil 29 is provided within the body 25 so as to correspond to the outer periphery of the magnetic body 28 provided on the upper part of the movable element 26.
A sealing material 30 connected between the movable element 26 and the body 25 at a position below the magnetic body 28 isolates the negative pressure chamber 10 from the atmosphere above the sealing material 30.

Next, the operation of the flow control valve configured as described above will be explained.

When a device (not shown) causes a current to flow through the excitation coil 29 according to the state in which negative pressure is introduced into the negative pressure chamber 10, the movable element 26 moves to the excitation coil 29.
The magnetic body 28 is pulled up to a position where its attractive force is balanced by the elastic force of the spring 27, and
The valve element 18 similarly moves upward as the partition part 6 moves upward against the bias of the spring 20, and the valve seat 4 in the valve body 1 moves upward.
opens, and the suction port 2 and discharge port 3 communicate with each other.

When the valve device 14 comes into contact with the rod portion 26a of the movable member 26 as the partition portion 6 moves upward, it moves down against the bias of the spring 15 and is pulled away from the valve seat 13 to open. Then, the atmosphere is introduced into the negative pressure chamber 10 through the atmospheric pressure chamber 11, the communication hole 22, the filter chamber 17, and the valve hole 12, so the negative pressure in the negative pressure chamber 10 becomes small, and the partition part 6 is pressed against the spring. The valve device 14 is moved downward by the biasing force 20 to close the valve seat 13, and the valve seat 4 in the valve body 1 is also closed by the valve body 18.

When the valve seat 13 is closed and the negative pressure in the negative pressure chamber 10 increases again, the partition portion 6 moves upward and the valve body 18 opens the valve seat 4.

Therefore, if the coil current of the excitation coil 29 is changed, the vertical position of the movable element 26 will also be changed.
Following this vertical movement amount, the valve body 18 connected to the partition portion 6 is also displaced in the same way as in the case described above, and the movement amount of the valve body 18, that is, the flow path area of the fluid passage 1a can be controlled.

As described in detail above, the flow control valve according to the present invention has the atmospheric passage 6a communicating the atmospheric pressure chamber and the negative pressure chamber.
is provided in the partition part 6, and the atmospheric passage 6a
A filter 16 for filtering the air introduced through the valve device 14 provided inside the air passage 6a is provided on the side of the atmospheric pressure chamber 11 bordering on the valve device 14,
Valve device 14 with opening/closing means provided at the end of movable element 26
It is characterized by being able to come into contact with. Therefore, the mover 26 is significantly simplified and the control mechanism 24
This has the effect of making it more compact and the structure simpler. Furthermore, since the movable element 26 is simplified, its mass is significantly reduced and responsiveness is significantly improved. For these reasons, the energy required for control is also reduced. Furthermore, the flow of air from the atmospheric pressure chamber 11 to the negative pressure chamber 10 via the atmospheric passage 6a in the partition 6 tends to cause air flow around the outer periphery of the valve box 1, which also has a cooling effect on the valve box 1. .

Further, since the filter 16 is located inside the partition 6, the structure is simpler and more compact than in the case where the filter 16 is located outside the partition 6, and there is an effect of eliminating dirt caused by mud or the like. Furthermore, since the filter 16 is clamped by the clamping plates 8 and 9 which clamp the diaphragm 7 of the partition section 6, there is an effect that the filter 16 can be easily assembled.

[Brief explanation of the drawing]

Figure 1 is a sectional view showing a conventional flow control valve, Figure 2 is a sectional view showing a conventional flow control valve.
The figure is a sectional view showing a flow control valve according to the present invention. Valve box...1, fluid passage...1a, valve seat...4, control body...5, partition...6, atmospheric passage...6a, diaphragm...7, clamping plate...8, 9, negative pressure chamber...10,
Atmospheric pressure chamber...11, valve hole...12, valve seat...13, valve device...14, filter...16, 116, filter chamber...17, valve body...18, communication hole...22, 122, control mechanism...24.

Claims (1)

[Scope of Claims] 1. The interior of the control unit body is divided into an atmospheric pressure chamber and a negative pressure chamber by a partition, and an atmospheric passage is provided through which the atmosphere and the negative pressure chamber communicate with each other via a valve device. A control mechanism is provided on the negative pressure chamber side that controls the opening and closing of the air passage by the displacement of the mover, and this control mechanism opens and closes the atmospheric passage to introduce atmospheric air into the negative pressure chamber and adjust the pressure in the negative pressure chamber. A flow rate system with a valve element on the atmospheric pressure chamber side that controls the operating amount of the partition and controls the flow area of the fluid passage in the valve box adjacent to the atmospheric pressure chamber by interlocking with the operating amount of the partition. In the control valve, the atmospheric passage that communicates the atmospheric pressure chamber and the negative pressure chamber is provided in the partition, and the atmospheric air introduced from the atmospheric pressure chamber to the negative pressure chamber is filtered through a valve device in the atmospheric passage. A flow control valve characterized in that the filter is provided on the atmospheric pressure chamber side bordering the valve device in the atmospheric passage, and the opening/closing means is provided at the end of the movable member so as to be able to come into contact with the valve device. 2. The flow control valve according to claim 1, wherein the filter is located inside the partition. 3. Claim 2, in which the filter is clamped by a clamping plate that clamps the diaphragm of the partition part.
Flow control valve as described in Section. 4. The atmospheric passage consists of a communication hole made through one of the clamping plates facing the atmospheric pressure chamber, a filter chamber containing a filter, and a valve hole bored through the other clamping plate facing the negative pressure chamber. 3. The flow control valve according to claim 3, wherein the valve device is provided within the valve hole.