DE102013019885B4 - Pressure control valve - Google Patents

Abstract

Pressure regulating valve (10) for regulating the pressure of a fluid (70), comprising - a valve housing (12) with a housing cover (14), - a valve body (16) which is connected to a membrane (22) which is in a first chamber (36) is arranged in the valve housing (12), the valve body (16) having a closure element (24) at one end (20), and a spring element (26) which is supported on the valve housing (12), a force is exerted on the membrane (22), with an outlet connection (30) having a valve seat (32) at one end arranged in the valve housing (12), which can be closed by the closure element (24), whereby a discharge of the fluid (70 ) is controllable, wherein a separating base (34) is arranged between the first (36) and a second chamber (38), the valve body (16) being guided through a guide opening (40) in the separating base (34), and wherein a Rinsing medium (72) from the first chamber (36) through at least one in the partition oden (34) arranged opening (46) is led to the second chamber (38), wherein the valve housing is divided into two chambers (36, 38) which communicate with one another, in particular via an annular gap, the fluid to be regulated (70 ) is introduced into the second chamber (38) via an inflow connection (28), the flushing medium being supplied via a flushing medium connection (42) arranged on the first chamber (36).

Description

Technical area

The invention relates to a pressure control valve, in particular for crankcase ventilation of the internal combustion engine of a motor vehicle.

State of the art

Pressure control valves are used, for example, in the ventilation line between the crankcase and the intake pipe or air filter of an internal combustion engine. The aim here is not to let the pressure or negative pressure in the container to be vented rise above a predetermined value.

In practical operation, gas, known as blow-by gas, is sucked through the pressure control valve built into the ventilation line between the intake manifold and the crankcase of the internal combustion engine. During the operation of the internal combustion engine, there should always be a slight negative pressure in the crankcase so that no blow-by gases containing oil can reach the outside through the seals, for example, and pollute the environment.

On the other hand, the specified negative pressure value should not be significantly undercut, because otherwise incorrect air would be sucked into the crankcase unintentionally through leaks.

The writing DE 20 2006 017 813 U1 shows an internal combustion engine with a ventilation device for its crankcase and with a ventilation line through which fresh air can be introduced into the crankcase as scavenging air. The ventilation line is provided with an adjustment device with which the flow cross-section of the ventilation line can be changed in the sense that the flow cross-section is smaller at low load and / or speed of the internal combustion engine and the flow cross-section is larger at high load and / or speed of the internal combustion engine.

From the DE 10 2008 061 753 A1 a pressure regulating valve is known which comprises a valve housing which is composed of a particularly cup-shaped lower housing part and a housing cover. The housing has an inflow nozzle opening into the lower housing part and an outflow nozzle opening out of the lower housing part, the nozzle end of which is arranged centrally within the valve housing and is designed as a valve seat.

The pressure control valve further comprises a clamped diaphragm valve body, sealed at its edge in a groove between the housing cover and the housing lower part, which divides the valve housing into a valve chamber and a ventilation chamber, wherein the ventilation chamber can be connected to the atmosphere via a ventilation duct. The membrane has a valve plate facing the valve seat at the nozzle end. The pressure regulating valve further comprises a compression spring which is supported on the bottom of the lower housing part and exerts a force on the membrane in the direction of the housing cover. The relatively aggressive blow-by gases reach the membrane when the pressure control valve is in operation and can thus influence its material in the long term.

Disclosure of the invention

The object of the invention is therefore to create a pressure control valve which, when operating an internal combustion engine, achieves a long service life even with fuels of poor quality.

According to one aspect of the invention, the aforementioned object is achieved in a pressure regulating valve for regulating the pressure of a fluid in that, in a valve housing, a separating base is arranged between a first and a second chamber, a valve body being guided through a guide opening in the separating base, and wherein a rinsing medium is guided to the second chamber through at least one opening arranged in the partition.

Favorable configurations and advantages of the invention emerge from the further claims, the description and the drawing.

A pressure regulating valve for regulating the pressure of a fluid is proposed, which comprises a valve housing with a housing cover, and a valve body which is connected to a membrane which is arranged in a first chamber in the valve housing, the valve body having a closure element at one end having, and wherein a force is exerted on the membrane via a spring element which is supported on the valve housing. Furthermore, an outflow nozzle has a valve seat at one end arranged in the valve housing, which valve seat can be closed by the closure element and whereby a discharge of the fluid can be regulated. A separating base is arranged between the first and a second chamber, the valve body being guided through a guide opening in the separating base, and a flushing medium being guided to the second chamber through at least one opening arranged in the separating base.

In particular, the closure element is arranged in the second chamber in the valve housing. The fluid to be controlled is via a Inflow nozzle introduced into the second chamber and discharged again from the second chamber via an outflow nozzle, inflow and outflow nozzle being arranged on the second chamber. Alternatively, the supply and discharge of the fluid can also take place via an integrated channel. The rinsing medium is supplied via a rinsing medium connector arranged on the first chamber.

The basic structure of the pressure regulating valve described, which can be arranged, for example, in a fluid line, in particular in a crankcase ventilation line, corresponds to a conventional pressure regulating valve, in particular consisting of a membrane, spring element and valve seat. In the solution according to the invention, the valve housing is divided into two chambers, for example, via an inserted partition, which can communicate with one another, in particular via an annular gap. The first chamber is sealed against the environment with a movable membrane which is arranged at one end of a valve body and which is supported against the partition base with a spring element, for example a compression spring. A very small volume flow of fresh air or flushing medium, such as an inert gas, is introduced into this first chamber. The flushing medium is taken from the intake of an internal combustion engine, for example, upstream of a turbocharger and / or downstream of a throttle valve by means of a check valve, depending on the load condition, and is fed to the valve housing via a flushing medium connection located on the first chamber. The volume flow is selected to be just large enough that the fluid, in particular the blow-by gas of the crankcase ventilation, cannot reach the membrane in the first chamber as a result of diffusion or convection due to the membrane movement. This represents a great advantage of such a pressure regulating valve as described, since there are currently no membrane materials that have sufficient media resistance to the aggressive blow-by gas for worldwide use. Especially in countries with poor fuel quality, the blow-by gas can have very aggressive properties compared to the previously used membrane materials such as. B. fluorosilicones have. As a result of the solution according to the invention, the membrane is no longer permanently contaminated with blow-by gas. Chemical aging of the membrane caused by blow-by gases is thus effectively reduced.

The spring element can advantageously be supported on the partition base. Since the valve body moves through a guide opening in the partition base and the guide opening tightly encloses the valve body shaft, it is expedient to support the spring element, which can be in the form of a compression spring, on the partition base itself. As a result, stable valve spring travel can also be set and a corresponding pressure calibration for the pressure control is made possible.

The valve seat can always be open when the membrane is at rest. As a result, the drainage nozzle is open when idle. In practical operation, blow-by gas is sucked through the pressure regulating valve built into the vent line between the intake manifold and the crankcase of the internal combustion engine. During operation, there should always be a slight negative pressure in the crankcase so that no oil-containing blow-by gases can escape through the seals and pollute the environment. On the other hand, the specified negative pressure value must not be significantly undercut, because otherwise incorrect air would be sucked into the crankcase unintentionally through leaks. This means that if there is a greater negative pressure in the suction line, the membrane of the pressure control valve is sucked in by the negative pressure in the drain connection and the valve body closes the drain connection with the closure element, which can be a valve plate.

The opening in the dividing base, through which the flushing medium is guided into the second chamber, can advantageously be formed by a gap between the dividing base and the valve body. Since the opening should be small enough that no blow-by gas from the crankcase can reach the membrane, the gap that the guide opening in the partition plate must have so that the valve body can move therein is typically sufficient as a flushing medium duct. The exact dimensions depend on the overall dimensions of the pressure control valve in its pressure limit values.

The opening can expediently comprise at least one compensating bore in the partition, in particular it can be formed by the compensating bore. Should the annular gap of the guide opening in the partition plate not be sufficient for a certain pressure design of the pressure control valve to allow sufficient flushing medium to pass through, additional compensating bores can provide an additional supply of the flushing medium supply to the second chamber. The number and size of the balancing bores also depends on the exact pressure design of the pressure control valve.

The closure element can advantageously be designed as a cone or truncated cone and seal the valve seat tightly. Such an embodiment has the advantage that a cone shape or truncated cone shape can close a round valve seat in a self-centering manner and thus the tightness of the pressure control valve in the closed state can easily be ensured. Alternatively this can However, the closure element can also be designed with a different suitable sealing geometry.

A flushing medium connector for supplying the flushing medium can advantageously be connected to an intake tract of an internal combustion engine. The flushing medium is taken from the intake of an internal combustion engine, for example, upstream of a turbocharger and / or downstream of a throttle valve by means of a check valve, depending on the load condition. In this way, a defined air supply is obtained, which has already passed through appropriate filter stages and cannot bring any additional dirt or moisture into the drainage connection.

In an advantageous embodiment, the flushing medium can be supplied via a flow restrictor. In this way, it can be ensured that the flushing medium can reach the first chamber of the pressure regulating valve through the flushing medium connector at a defined pressure and that there are defined conditions for the flushing medium supply of the pressure regulating valve during operation on the crankcase ventilation. The flow restrictor can be arranged on the flushing medium connector, for example. Alternatively, the throughflow throttle can also be integrated into the flushing medium connector or the valve housing.

The housing cover can advantageously have a ventilation opening to the environment. This means that the ambient pressure is available as a reference for the pressure control valve, which is applied to the outside of the membrane. In this respect, the pressure control valve regulates the pressure in the crankcase ventilation in relation to the external ambient pressure. Also, no additional supply lines for the ambient pressure need to be brought up to the pressure control valve.

In an advantageous embodiment, the movement of the valve body can run centrally along an axis of the valve housing. A centrally symmetrical design of the pressure control valve has a particularly favorable mode of operation in operation due to the symmetry of the arrangement. The design for given pressure conditions is thus easily possible. Spring elements, for example in the form of compression springs, are available and the construction of the entire pressure control valve can be designed in this way.

For this purpose, an inlet connection for feeding the fluid can expediently be arranged eccentrically to the axis. Since the flow ratios are to be designed so favorably if the valve body runs, for example, in an axis of the valve housing, the inflow connection is arranged favorably offset to this in order to also represent a favorable possibility of mounting the pressure control valve.

Advantageously, an outflow nozzle for discharging the fluid can then open centrally in the axis into the valve seat. In this way, the outflow of the fluid from the second chamber into the outflow connector is favorable, since the symmetry of the arrangement favors a simple control behavior of the pressure control valve.

The pressure control valve can advantageously be used for crankcase ventilation of an internal combustion engine. By supplying the first chamber of the pressure control valve with a flushing medium according to the invention, contamination of the relatively sensitive membrane with aggressive blow-by gases is reduced and thus a long service life of such a pressure control valve in the crankcase ventilation is promoted.

However, the use of the pressure control valve for other applications is by no means excluded. In applications in which the fluid to be regulated could have certain harmful effects on the membrane of the pressure regulating valve, for example through aggressive gases or moisture, the use of the pressure regulating valve according to the invention is advantageously conceivable.

Figure list

Further advantages emerge from the following description of the drawings. Exemplary embodiments of the invention are shown in the drawing. The drawing, the description and the claims contain numerous features in combination. The person skilled in the art will expediently also consider the features individually and combine them into useful further combinations.

• 1 ein Druckregelventil nach einem Ausführungsbeispiel der Erfindung.

It shows as an example:

• 1 a pressure control valve according to an embodiment of the invention.

Embodiment of the invention

The only 1 shows only an example and is not to be understood as limiting.

1 describes a pressure control valve 10 according to an embodiment of the invention. The pressure control valve 10 includes a valve housing 12 with a housing cover 14th , and a valve body 16 , which with a membrane 22nd at one end 18th connected in a first chamber 36 in the valve housing 12 is arranged, the valve body 16 at another end 20th a closure element 24 having, and wherein a spring element 26th , which is on the valve housing 12 supports a force on the diaphragm 22nd is exercised. The pressure control valve also includes 10 an inflow nozzle 28 for the supply of a fluid 70 , in particular the blow-by gases from a crankcase of an internal combustion engine, into the valve housing 12 , a drainage nozzle 30th for the drainage of the fluid 70 from the valve body 12 , which on one in the valve housing 12 arranged end a valve seat 32 has, which by the closure element 24 is lockable. Here are the inflow nozzles 28 and the drainage nozzle 30th in a second chamber 38 in the valve body 12 arranged while between the first and second chambers 36 , 38 a partition 34 is arranged, the valve body 16 through a guide opening 40 in the partition 34 is performed, and wherein a flushing medium 72 by one at the first chamber 36 arranged flushing medium nozzle 42 through one in the partition 34 arranged opening 46 to the second chamber 38 to be led.

The spring element 26th , which is designed in the form of a compression spring, is on the partition 34 supported. The valve seat 32 is in the resting state of the membrane 22nd open. The opening 46 for the supply of the flushing medium 72 from the flushing medium connector 42 into the second chamber is through a gap 44 , for example an annular gap, between the partition 34 and the valve body 16 , in the illustrated embodiment of the guide opening 40 , educated. Alternatively, the opening 46 at least one compensating hole 48 in the partition 34 include, in particular through the compensating bore 48 be educated.

The closure element 24 of the pressure control valve 10 can be designed in a cone shape or with another suitable sealing geometry and closes the valve seat 32 tight. The closure element can have a conical shape or a truncated cone shape 24 the round valve seat 32 self-centering and thus the tightness of the pressure regulating valve 10 ensure when closed.

The flushing medium nozzle 42 is conveniently over a line 52 connected to an intake tract of an internal combustion engine, wherein in the flushing medium connector 42 in 1 a flow restrictor 54 is arranged. The flushing medium 72 is for example over a line depending on the load 62 in front of a turbocharger and / or via a line 64 taken after a throttle valve, the two lines 62 , 64 each by means of a check valve 60 are secured against backflow. In this way, a defined supply of the flushing medium is obtained 72 In the exemplary embodiment shown, that is, air from an intake tract of an internal combustion engine, which has already passed through appropriate filter stages and no additional dirt or moisture in the drainage connection 30th can bring. By using the flow restrictor 54 it can be guaranteed that the flushing medium 72 with a defined pressure through the flushing medium nozzle 42 in the first chamber 36 of the pressure control valve 10 can reach and thus defined conditions for the flushing media supply of the pressure control valve 10 prevail during operation on the crankcase ventilation.

The housing cover 14th has a ventilation opening 50 to the environment. This is as a reference for the pressure control valve 10 the ambient pressure available, which is so on the outside of the membrane 22nd is applied. In this respect, the pressure control valve regulates 10 the pressure in the crankcase ventilation related to the external ambient pressure.

The movement of the valve body 16 runs centrally along an axis 56 of the valve body 12 so that the inflow nozzle 28 eccentric to the axis 56 is arranged, so also a favorable mounting option for the pressure control valve 10 depict while the drainage nozzle 30th centrally in the axis 56 in the valve seat 24 opens so that the outflow of the fluid 70 from the second chamber 38 in the drainage port 30th designed favorably, since the symmetry of the arrangement a simple control behavior of the pressure control valve 10 favored. A centrally symmetrical design of the pressure control valve 10 has a particularly favorable mode of operation during operation due to the symmetry of the arrangement. The design for given pressure conditions is thus easily possible, spring elements 26th The construction of the entire pressure control valve, for example in the form of compression springs, is available 10 can be designed so cheaply

The pressure control valve 10 in 1 is designed for use for crankcase ventilation of an internal combustion engine. By supplying the first chamber according to the invention 36 of the pressure control valve with a flushing medium 72 becomes a contamination of the relatively sensitive membrane 22nd , which consists of fluorosilicone, for example, is reduced with aggressive blow-by gases and thus a long service life of such a pressure control valve 10 favored in the crankcase ventilation.

Claims (11)

Pressure regulating valve (10) for regulating the pressure of a fluid (70), comprising - a valve housing (12) with a housing cover (14), - a valve body (16) which is connected to a membrane (22) which is in a first chamber (36) is arranged in the valve housing (12), the valve body (16) having a closure element (24) at one end (20), and a spring element (26) which is located on the valve housing (12) supported, a force is exerted on the membrane (22), wherein an outflow nozzle (30) has a valve seat (32) at one end arranged in the valve housing (12), which valve seat can be closed by the closure element (24), whereby a discharge of the fluid (70) is controllable, a partition plate (34) being arranged between the first (36) and a second chamber (38), the valve body (16) being guided through a guide opening (40) in the partition plate (34), and wherein a flushing medium (72) is fed from the first chamber (36) through at least one opening (46) arranged in the separating base (34) to the second chamber (38), the valve housing being divided into two chambers (36, 38) which communicate with one another, in particular via an annular gap, the fluid (70) to be regulated being introduced into the second chamber (38) via an inflow connection (28), the flushing medium being supplied via a flushing medium connection (36) arranged on the first chamber (36). 42) is fed. Pressure control valve according to Claim 1 , wherein the spring element (26) is supported on the partition base (34). Pressure control valve according to Claim 1 or 2 , wherein the opening (46) is formed by a gap (44) between the partition base (34) and the valve body (16). Pressure control valve according to one of the preceding claims, wherein the opening (46) comprises at least one compensating bore (48) in the dividing base (34), in particular being formed by the compensating bore (48). Pressure control valve according to one of the preceding claims, wherein the closure element (24) is designed as a cone or truncated cone and tightly closes the valve seat (32). Pressure control valve according to one of the preceding claims, wherein the flushing medium connector (42) for supplying the flushing medium (72) is connected to an intake tract of an internal combustion engine. Pressure control valve according to one of the preceding claims, wherein the housing cover (14) has a ventilation opening (50) to the environment. Pressure control valve according to one of the preceding claims, wherein the movement of the valve body (16) runs centrally along an axis (56) of the valve housing (12). Pressure control valve according to one of the preceding claims, wherein an inflow connection (28) for feeding in the fluid (70) is arranged eccentrically to the axis (56). Pressure control valve according to one of the preceding claims, wherein an outflow connector (30) for discharging the fluid (70) opens centrally in the axis (56) into the valve seat (24). Use of the pressure control valve (10) according to one of the preceding claims for crankcase ventilation of an internal combustion engine.

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