KR20180021300A - Compressed air recirculation valve - Google Patents

Abstract

The present invention relates to a compressed air recirculation valve capable of preventing damage and noise due to a pulsating wave by bypassing compressed air in an intake line connecting an intercooler and a turbocharger when a throttle valve is shut off and the compressor operates normally. The present invention has a valve which opens or closes the intake hole and a solenoid to operate the valve. The valve comprises: a shield coupled to the bottom of the solenoid and having a chamber therein; a poppet coupled through the shield and moved by the solenoid; a sealing seal which seals between the shield and the poppet. The poppet includes: an outer housing which penetrates the shield; an inner housing formed inside the outer housing; a through hole formed along the periphery of the inner housing; and a rubber seal provided at a lower end of the outer housing.

Description

[0001] COMPRESSED AIR RECIRCULATION VALVE [0002]

The present invention relates to a compressed air recirculation valve installed in a turbocharged engine, and more particularly to a recirculation valve for bypassing compressed air in an intake line connecting an intercooler and a turbocharger.

Generally, a CNG engine using CNG (Compressed Natural Gas) is equipped with a turbocharger for supercharging the intake air supplied to the intake manifold.

The turbocharger is composed of a compressor installed in the intake line and a turbine installed in the exhaust line, and the compressor and the turbine are installed in one shaft. The turbine is rotated by the pressure of the exhaust gas discharged from the engine through the exhaust line, and the compressor rotates by the turbine and compresses the intake air passing through the intake line.

The air compressed by the compressor of the turbocharger is cooled while passing through the intercooler, and then flows into the intake manifold when the throttle valve is opened. In the CNG engine, the amount of air compressed by the turbocharger is controlled to control the output of the engine. Further, when the accelerator pedal is operated, the final output of the engine is controlled in accordance with the amount of compressed air flowing into the intake manifold while the throttle valve is opened or closed or the opening amount of the throttle valve is controlled.

However, in the case of the CNG engine, there is an interval in which the throttle valve is closed because the driver does not step on the accelerator pedal during a period in which the output suddenly drops after acceleration. In this section, the flow of compressed air through the throttle valve is temporarily blocked, and the compressor normally operates (rotates).

In this way, when the throttle valve is shut off and the compressor operates normally, the pressure between the turbocharger and the throttle valve suddenly fluctuates and a pulse wave is generated inside the intake line. The pulsating waves are transmitted along the intake line to the intercooler and / or the turbocharger to damage the components and generate surge noise.

In order to solve the above problems, when the throttle valve abruptly closes, compressed air in the intake line is bypassed to minimize the pressure fluctuation and thus the occurrence of the pulsating wave, to prevent damage to the intercooler and the turbocharger, There has been developed a compressed air recirculation valve capable of suppressing the generation of the compressed air.

Korean Registered Patent No. 10-1490918 (Feb.

SUMMARY OF THE INVENTION The present invention has been made in order to solve the above problems of the prior art, and it is an object of the present invention to provide an air conditioner which is capable of bypassing a throttle valve and bypassing compressed air in an intake line connecting an intercooler and a turbocharger, And to provide a compressed air recirculation valve capable of preventing the above-mentioned problems.

In order to achieve the above object, the compressed air recirculation valve according to the present invention is a valve that bypasses compressed air flowing through an intake port and prevents the compressed air from flowing back to the turbocharger. The construction of the valve is made up of a valve for opening or closing the intake port, and a solenoid for actuating the valve.

The valve includes a shield which is coupled to a lower end of the solenoid and has a chamber formed therein, a poppet which penetrates through the shield and moves by the solenoid, and a sealing seal which seals between the shield and the poppet do.

The poppet includes an outer housing penetrating the shield, an inner housing formed inside the outer housing, a through hole formed along the periphery of the inner housing, and a rubber seal provided at a lower end of the outer housing.

The outer housing is formed in a cylindrical shape, and the inner housing is formed in a tapered shape that extends upward from an inner lower end of the outer housing, and has a smaller diameter toward the upper portion.

The outer housing includes a cylindrical body, a first flange formed around the upper end of the body, and a second flange formed around the lower end of the body. At this time, the outer diameter of the body is formed to be equal to or smaller than the inner diameter of the air inlet.

The inner wall of the outer housing includes a large diameter portion connected to the chamber, and a small diameter portion having a smaller diameter than the large diameter portion and extending the inner housing. A seating portion is formed between the large-diameter portion and the small-diameter portion, and a spring that elastically supports the poppet downward is seated on the seating portion.

A coupling ring for coupling with the solenoid is formed at an upper end of the inner housing, and the through hole extends from the coupling ring to the seating portion.

The shield includes a body having the chamber formed therein, and a fixing jaw formed at a lower end of the body and provided with the sealing seal.

The sealing seal includes a first sealing lip contacting the inner wall of the shield and a second sealing lip contacting the outer wall of the poppet.

According to the present invention configured as described above, when the solenoid is operated, the poppet moves and opens the intake port so that compressed air in the intake line is bypassed through the intake port without flowing back to the turbocharger side. Therefore, it is possible to prevent the occurrence of the pulsating wave due to the pressure fluctuation of the intake line, to prevent the intercooler and the turbocharger from being damaged, and to suppress the occurrence of the surge noise.

Further, the present invention is characterized in that the chamber provided inside the shield is partitioned from the intake port side by the poppet, and a through hole is formed in the poppet so as to form pressure balance on the intake port side, so that the operational resistance of the poppet due to the pressure difference between the chamber and the inlet port It is possible to improve the operating performance of the valve.

1 is a cross-sectional view of a compressed air recirculation valve in accordance with an embodiment of the present invention;
2 is an enlarged view of a portion of a compressed air recirculation valve according to an embodiment of the present invention;
3 is a perspective view of a poppet of a compressed air recirculation valve in accordance with an embodiment of the present invention.
4 is a partial cross-sectional perspective view of a poppet of a compressed air recirculation valve in accordance with an embodiment of the present invention.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Referring to the accompanying drawings, embodiments of the present invention will be described in detail. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings.

The compressed air recirculation valve according to an embodiment of the present invention bypasses the compressed air in the intake line when the pressure of the intake line connecting the intercooler and the turbocharger is abruptly changed to prevent generation of the pulsating wave, And more particularly, to a recirculation valve capable of eliminating damage and noise of a recirculation valve.

As shown in Fig. 1, the compressed air recirculation valve 1 according to the present embodiment is installed in a bypass piping 3 connected to an intake line (not shown). An intake port 5 connected to an intake line (not shown) is formed in the lower portion of the bypass pipeline 3, and a compressed air recirculation valve 1 for opening or closing the intake port 5 is provided in the upper portion. At this time, the intake port 5 is formed so as to protrude inward of the bypass pipe 3 in order to improve the opening / closing performance by the compressed air recirculation valve 1.

The compressed air recirculation valve 1 comprises a valve 100 for opening or closing the intake port 5 and a solenoid 200 for actuating the valve 100.

The valve 100 includes a shield 110 coupled to the lower end of the solenoid 200, a poppet 120 coupled to the plunger 270 of the solenoid 200 and passing through the shield 110, And a sealing seal 150 interposed between the shield 110 and the poppet 120. The spring 140 is installed between the body 110 and the poppet 120,

Referring to FIGS. 2 to 4, each of the components 110 to 150 constituting the valve 100 will be described in more detail.

The shield 110 includes a hollow body 112 extending up and down. A chamber 114, which is an operating space of the poppet 120, is formed inside the body 112. A flange 116 is formed around the upper end of the body 112 for coupling with the solenoid 200. The flange 116 is bent outward (radially outward) from the upper end of the body 112 and a coupling protrusion 117 is formed on the upper surface of the flange 116 to be inserted into the coupling groove 218 of the solenoid 200 . Around the lower end of the body 112, a fixing jaw 118 for mounting the sealing seal 150 is bent inward (radially inward) of the body 112. At this time, a gap 119 is formed between the fixing jaw 118 and the poppet 120 to prevent interference with the fixing jaws 118 when the poppet 120 moves (ascends and descends).

A stopper 219 is provided in the coupling groove 218 of the solenoid 200. The stopper 219 is in the shape of a cylinder extending downward from the upper surface of the coupling groove 218 and its lower end is in contact with the sealing seal 150 provided on the fixing step 118. Such a stopper 219 prevents the sealing seal 150 from flowing during the movement of the poppet 120, thereby improving the sealing effect of the sealing seal 150.

The poppet 120 is a double structure composed of an outer housing 121 passing through the shield 110 and an inner housing 131 provided inside the outer housing 121. At this time, the outer housing 121 and the inner housing 131 are integrally connected to each other through a lower end.

The outer housing 121 is formed in a cylindrical shape. That is, the outer housing 121 includes a vertically extending cylindrical body 122. A first flange 123 is provided around the upper end of the body 122 and a second flange 124 is provided around the lower end.

The body 122 of the outer housing 121 has a cylindrical shape with an upper end and a lower end having the same diameter. The outer diameter of the body 122 is formed to be equal to or smaller than the inner diameter of the air inlet (5 in FIG. When the outer diameter of the body 122 is made to be equal to or smaller than the inner diameter of the intake port 5, the operating resistance due to the internal pressure of the chamber 114 (the pressure applied in the vertical axis direction to the poppet 120) can be reduced.

The first flange 123 is bent outwardly (radially outward) from the top of the body 122 and contacts the sealing seal 150 when the poppet 120 is lowered. The second flange 124 is bent outward (radially outward) from the lower end of the body 122 and contacts the intake port 5 when the poppet 120 is lowered.

A rubber seal 160 is provided on the lower surface of the second flange 124. The rubber seal 160 is a means for preventing the compressed air from leaking between the poppet 120 and the intake port 5 when the intake port 5 is closed by the poppet 120. [ At this time, the rubber seal 160 is fixed to the lower surface of the second flange 160 by an insert molding method.

On the other hand, the inner wall of the outer housing 121 is formed in a multi-stage structure including a large-diameter portion 125 and a small-diameter portion 126. The large diameter portion 125 is formed to have a larger diameter than the small diameter portion 126 and the seating portion 127 is formed between the large diameter portion 125 and the small diameter portion 126. The inner housing 121 extends upward from the small diameter portion 126 and a spring 140 is installed on the seating portion 127 to elastically support the poppet 120 downward.

The inner housing 131 has a tapered shape that extends upward from the lower inner side of the outer housing 121, that is, the small diameter portion 126, and has a smaller diameter toward the upper portion. In other words, the inner housing 131 has a conical shape in which the diameter of the upper end is smaller than the lower end and the diameter becomes smaller toward the upper end.

At the upper end of the inner housing 131, a coupling ring 132 for coupling with the plunger 270 is formed. A through hole 133 is formed on the inclined side surface of the inner housing 131 to connect the chamber 114 and the intake port 5 with each other. The through holes 133 are formed of a plurality of radially disposed along the inclined side surface of the inner housing 131. Further, the through hole 133 is formed in an elliptical shape extending from the coupling ring 132 to the seating portion 127. At this time, the through hole 133 is formed to penetrate the inclined side surface of the inner housing 131 in the vertical axis direction.

The above-mentioned through hole 133 connects the chamber 114 partitioned by the poppet 120 with the inlet 5 so that pressure balance can be achieved on both sides. Therefore, since the same pressure is applied to the chamber 114 and the inlet 5, the operating resistance due to the internal pressure of the chamber 114 (the pressure applied in the vertical axis direction to the poppet 120) can be reduced. In particular, since the through hole 133 penetrates the inclined side surface of the inner housing 131 in the vertical axis direction, the operating resistance due to the internal pressure of the chamber 114 can be completely solved.

The spring 140 is a conventional coil spring. The upper end of the spring 140 is inserted into the engagement groove 218 of the solenoid 200 and the lower end thereof is inserted into the seating portion 127 of the poppet 120. The spring 140 elastically supports the poppet 120 downward so that the intake port 5 is closed by the poppet 120.

The sealing seal 150 is a means for sealing between the shield 110 and the poppet 120. The sealing seal 150 has a V-shaped lip seal shape to seal between the shield 110 fixed to the solenoid 200 and the poppet 120 movably installed. That is, the sealing seal 150 includes a first sealing lip 152 that contacts the inner wall of the shield 110 and a second sealing lip 154 that contacts the outer wall of the poppet 120.

The structure of the solenoid 200 for operating the valve 100 will be described with reference to FIG.

The solenoid 200 includes an outer case 210 and an inner case 220 installed inside the outer case 210.

The outer case 210 has a cylindrical shape extending vertically. The upper surface and the lower surface of the outer case 210 are both closed and an opening 212 is formed at the center so that the plunger 270 can pass through. Around the upper end of the outer case 210 is provided a terminal 214 for supplying power to the solenoid 200 and a flange for fixing the compressed air recirculation valve 1 to the bypass pipe 3 216 are provided. A coupling groove 218 for mounting the shield 110 is formed on the lower surface of the outer case 210 and a stopper 219 is provided on the coupling groove 218.

An O-ring O is interposed between the outer case 210 and the bypass pipe 3. The O-ring O is inserted into a separate space provided outside the coupling groove 218 to seal between the outer case 210 and the bypass pipe 3. In addition, the outer case 210 and the shield 110 are also sealed.

The inner case 220 has a cylindrical shape in which both upper and lower surfaces are opened. The first and second latching protrusions 222 and 224 are formed on the upper and lower ends of the inner case 220, respectively. A core 250 is mounted on the first stopping jaw 222 and a plate 260 is mounted on the second stopping jaw 224.

A bobbin 230 is provided inside the inner case 220. The bobbin 230 has a hollow spool shape with flanges protruding from both ends thereof. The core 250 and the plate 260 are coupled to the upper and lower portions of the bobbin 230, respectively, and the coil 230 for generating a magnetic field is wound on the outer circumferential surface. The bobbin 230 is made of synthetic resin so as to electrically block the coil 240 and the core 250, between the coil 240 and the plate 260, and between the coil 240 and the plunger 270 .

The coil 240 generates a magnetic field around the bobbin 230 when the power is applied. The coil 240 is tightly and uniformly wound around the outer circumferential surface of the bobbin 230 to form a cylindrical shape. The magnetic field generated by the coil 240 when the power is applied is induced by the core 240 and the plate 250 to raise the plunger 270. At this time, the intensity of the magnetic field is proportional to the intensity of the current flowing along the coil 240 and the number of the coils 240 wound on the bobbin 230. Therefore, as the coil 240 is strongly energized or the coil 240 is heavily coiled, a strong magnetic field is generated, so that the movement of the plunger 270 can be reliably controlled.

The core 250 is a component for inducing a magnetic field generated in the coil 240. This core 250 consists of a flange 252 and a body 254 coupled to the flange 252. The flange 252 is a plate member having a predetermined thickness and is mounted and fixed to the first latching jaw 222 of the inner case 220. The body 254 is a cylinder having a predetermined length and is inserted into the bobbin 230. The lower end of the body 254 is formed in a taper shape having a smaller diameter toward the lower portion so that a magnetic field generated by the coil 240 can be concentrated on the lower end of the body 254. A working space 256 for reciprocating motion of the plunger 270 is formed in the body 254 and an elastic ring 258 is provided in the working space 256. The elastic ring 258 serves to prevent the impact caused by the contact with the core 250 when the plunger 270 is lifted.

The plate 260 is a component for inducing a magnetic field generated in the coil 240 together with the core 250. The plate 260 is in the shape of a disk having a predetermined thickness, and an opening 262 through which the plunger 270 passes is formed at the center thereof.

A rod 280 for guiding the movement of the plunger 270 is installed in the solenoid 200. The rod 280 is a shaft of a circular cross section having a predetermined length and extends to the plunger 270 through the core 250.

The plunger 270 is a movable iron core that reciprocates by a magnetic field generated by the coil 240. The plunger 270 has a cylindrical shape extending vertically. A guide hole 272 for inserting the rod 280 is formed in the plunger 270 and a bearing 292 is provided in the guide hole 272. The bearing 292 is in contact with the rod 280 to guide the moving direction of the plunger 270 and at the same time to reduce friction due to contact with the rod 280.

A mounting protrusion 274 for mounting the poppet 120 protrudes from the lower end of the plunger 270. The poppet 120 can be fixed by inserting the engaging ring 132 of the poppet 120 into the mounting protrusion 274 and then tightening the fixing nut 276. [ At this time, the mounting projection 274 is formed in a multi-stage so that the coupling ring 132 fitted to the mounting projection 274 is not squeezed by the fixing nut 276. In other words, the poppet 270 is rotatable with the plunger 270 installed.

A guide bush 294 is provided on the outside of the plunger 270, more specifically, in the lower end of the bobbin 230. The guide bush 294 serves to guide the movement direction of the plunger 270 from the outside of the plunger 270 and to reduce the friction.

The compressed air recirculation valve 1 having the above-described structure can relieve the operational resistance of the poppet 120 through the pressure balance between the chamber 114 and the intake port 5 and improve the responsiveness of the valve 100 have.

FIGS. 3 and 4 are graphs showing experimental results of evaluating the operability of the poppet according to the present embodiment.

Two types of poppet were prepared to evaluate the operability of the poppet according to the present embodiment. The poppet shown in Fig. 3 (a) is a poppet to which the feature according to the present embodiment is applied, and the poppet shown in Fig. 3 (b) is a normal poppet.

The outside diameter of the poppet according to the present embodiment is 21.5 mm, which is the same as the inside diameter of the inlet port, the small diameter portion is 17.5 mm smaller than the inside diameter of the inlet port, and the outside diameter of the second flange is 25.5 mm larger than the inside diameter of the inlet port. At this time, the inner housing is formed in an elliptical shape elongated from the coupling ring to the seat portion.

 On the other hand, the outer diameter of a normal poppet is 27.7 mm larger than the inner diameter of the intake port, and the small diameter portion is 21.5 mm, which is the same as the inner diameter of the intake port. At this time, a through hole having a size smaller than that of the present embodiment is formed in the inner housing.

After the two types of poppet described above were installed in the bypass pipe, predetermined pressures (140 psi, 250 psi, and 300 psi) were applied to the inlet port to evaluate the operability of the poppet.

As shown in FIG. 4, it can be seen that the operational resistance of 0.23 N, 0.28 N, and 0.32 N is generated in the vertical axis direction when the pressure of 140 psi, 250 psi, and 300 psi is applied to the inlet port of the poppet according to the present embodiment there was.

On the other hand, in the conventional poppet, when the pressure of 140 ㎪, 250 ㎪ and 300 에 is applied to the inlet, the operating resistance of 20.72N, 37.15N and 44.60N is generated in the vertical axis direction.

As a result, the poppet according to the present embodiment realizes the pressure balance between the chamber and the inlet port as compared with the conventional art, so that the operating resistance is eliminated.

5 is a graph showing an experimental result of evaluating the responsiveness of the valve including the poppet according to the present embodiment.

To evaluate the responsiveness of the valve including the poppet according to the present embodiment, two types of poppet were prepared (see Fig. 3).

The two types of poppet described above were installed in a bypass pipe, and a predetermined pressure (1.4 to 3.0 bar) was applied to the inlet port to evaluate the responsiveness of the valve.

As shown in FIG. 5, the response of the poppet according to the present embodiment was not changed while the pressure applied through the inlet was applied from 1.4 bar to 3.0 bar. However, as the pressure applied to the inlet of the conventional poppet increased It can be seen that the response is poor.

While the present invention has been particularly shown and described with reference to preferred embodiments thereof, it is to be understood that the invention is not limited to the disclosed embodiments, but, on the contrary, is intended to cover various modifications and equivalent arrangements included within the spirit and scope of the appended claims. Those skilled in the art will understand. Therefore, the scope of protection of the present invention should be construed not only in the specific embodiments but also in the scope of claims, and all technical ideas within the scope of the same shall be construed as being included in the scope of the present invention.

1: Compressed air recirculation valve 3: Bypass piping
5: inlet port 100: valve
110: shield 120: poppet
140: spring 150: sealing seal
160: Rubber seal 200: Solenoid
210: outer case 220: inner case
230: Bobbin 240: Coil
250: core 260: plate
270: plunger 280: rod
O: O-ring

Claims (10)

A recirculation valve comprising: a valve for opening or closing an intake port; and a solenoid for actuating the valve, wherein the recirculation valve prevents the compressed air introduced through the intake port from bypassing to the turbocharger side,
The valve includes a shield which is coupled to a lower end of the solenoid and has a chamber formed therein, and a poppet which is coupled to penetrate through the shield and moves by the solenoid,
The poppet includes an outer housing that penetrates the shield, an inner housing formed inside the outer housing, a through hole formed along the periphery of the inner housing, and a rubber seal provided at a lower end of the outer housing,
And the chamber is pressure-balanced with the intake port side through the through-hole.
The method according to claim 1,
Wherein the outer housing is formed in a cylindrical shape and the inner housing has a tapered shape that extends upward from an inner lower end of the outer housing and has a smaller diameter toward an upper portion thereof.
The method of claim 2,
The outer housing includes a cylindrical body, a first flange formed around the upper end of the body, and a second flange formed around the lower end of the body,
And the outer diameter of the body is formed to be equal to or smaller than the inner diameter of the inlet port.
The method of claim 3,
Wherein the inner wall of the outer housing comprises a large diameter portion connected to the chamber and a small diameter portion having a smaller diameter than the large diameter portion and extending the inner housing,
Wherein a seating portion is formed between the large-diameter portion and the small-diameter portion, and a spring for elastically supporting the poppet downward is seated on the seating portion.
The method of claim 4,
Wherein a coupling ring for coupling with the solenoid is formed at an upper end of the inner housing, and the through hole extends from the coupling ring to the seating portion.
The method of claim 5,
Wherein the rubber seal is fixed to the lower surface of the second flange by an insert molding method.
The method according to any one of claims 1 to 6,
Wherein the valve further comprises a sealing seal for sealing between the shield and the poppet.
The method of claim 7,
Wherein the shield comprises a body in which the chamber is formed, and a fixing jaw formed at a lower end of the body and on which the sealing seal is installed.
The method of claim 8,
Wherein the sealing seal comprises a first sealing lip contacting the inner wall of the shield and a second sealing lip contacting the outer wall of the poppet.
The method of claim 9,
Wherein a stopper for preventing the flow of the sealing seal is formed at a lower end of the solenoid.

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