DE102019216118A1 - VALVE MODULE FOR A PUMP FOR CONDUCTING FLUID IN AN EXHAUST GAS TREATMENT SYSTEM - Google Patents

Abstract

The various embodiments herein provide a valve module 106 for a pump 102 for directing fluid in an exhaust aftertreatment system 100. The valve module 106 includes a housing 212 with a base 218 and a side wall 220 extending therefrom. The side wall 220 comprises at least a first pair of channels 214 and a second pair of channels 216, which are designed to be in flow communication with a tank 112 or the supply unit 114. The valve module 106 further includes a cam disc 210 that is positioned and rotatable in the housing 212. A valve plate 202 encloses the cam disc 210 in the housing 212. The valve plate 202 includes a first pair of valves 204 and a second pair of valves 206, which correspond to the first pair of channels 214 and the second pair of channels 216, respectively. A magnetic drive unit 110 is designed to operate the valve module 106.

Description

Field of the Invention:

The present invention relates to a valve module for a pump for guiding fluid in an exhaust gas aftertreatment system.

Background of the Invention:

The patent specification US2010212303 discloses an apparatus for injecting an additive into the exhaust system of a motor vehicle. The device for injecting a liquid additive comprises an additive tank which is connected by an additive pipe to an injector positioned in the exhaust system of the vehicle in question, a stroke and pressure displacement pump being provided on the additive pipe, said pump being a cylinder and a piston, which defines a pressure chamber in the cylinder, and wherein an electrical actuator is coupled to the piston to cause it to retract, thereby drawing additive out of the tank into the chamber and at the same time compressing a spring acting on the piston , so that the forward movement of the piston, which supplies the injection valve with additive, takes place under controlled pressure by the spring.

Figure list

• 1 stellt ein Blockdiagramm des Ventilmoduls gemäß einer Ausführungsform der vorliegenden Erfindung dar;
• 2 stellt eine auseinandergezogene Ansicht des Ventilmoduls gemäß einer Ausführungsform der vorliegenden Erfindung dar;
• 3 stellt die Zufuhr von Fluid durch das Ventilmodul gemäß einer Ausführungsform der vorliegenden Erfindung dar, und
• 4 stellt das Spülen von Fluid durch das Ventilmodul gemäß einer Ausführungsform der vorliegenden Erfindung dar.

An embodiment of the disclosure will be described with reference to the following accompanying drawings:

• 1 FIG. 13 illustrates a block diagram of the valve module according to an embodiment of the present invention;
• 2nd FIG. 12 illustrates an exploded view of the valve module according to an embodiment of the present invention;
• 3rd FIG. 12 illustrates the supply of fluid through the valve module according to an embodiment of the present invention, and
• 4th FIG. 14 illustrates the flushing of fluid through the valve module according to an embodiment of the present invention.

Detailed description of the embodiments:

1 FIG. 3 illustrates a block diagram of the valve module according to an embodiment of the present invention. The valve module 106 is for an exhaust gas aftertreatment system 100 shown. It becomes a pump 102 , which can be a rotary lobe pump or a reciprocating pump. A two-way arrow next to the pump 102 indicates that a reciprocating pump (such as a diaphragm pump) is used / being considered for purposes of illustration. A chamber 104 the pump 102 stands with the valve module 106 in fluid communication. The valve module 106 is in 2nd described in more detail. The valve module 106 is also with lines 108 which is the fluid or the diesel exhaust fluid (DEF) or a urea solution between a tank 112 and the feed unit 114 direct, coupled. The feed unit 114 is a metering module / injector that is attached to an exhaust pipe (not shown) of a vehicle. The valve module 106 is powered by a drive unit 110 operated.

2nd FIG. 12 illustrates an exploded view of the valve module according to an embodiment of the present invention. It becomes the valve module 106 for the pump 102 for directing the fluid in the exhaust aftertreatment system 100 provided. The valve module 106 includes a housing 212 with a base 218 and a side wall 220 that extends from it. The side wall 220 includes at least a first pair of channels 214 and a second pair of channels 216 which are designed with a fluid source or a fluid tank 112 or the feed unit 114 to be in flow communication. The valve module 106 is through a cam disk 210 that in the housing 212 positioned and rotatable. A valve plate 202 encloses the cam disc 210 in the housing 212 . The cam disc 210 is in a warehouse 230 positioned. The valve plate 202 includes a first pair of valves 204 and a second pair of valves 206 that are the first pair of channels 214 or the second pair of channels 216 correspond. Furthermore, there is at least a first magnet 226 in the cam disc 210 positioned. The drive unit 110 is designed to the cam disc 210 by the at least one first magnet 226 without any contact with the housing 212 to operate. The drive unit 110 is a magnetic drive unit 110 .

A circumferential profile of the cam disc 210 is designed to have one channel each from the first pair of channels 214 and the second pair of channels 216 with one channel each from the first pair of valves 204 and the second pair of valves 206 fluid coupling. To achieve this, the cam disc is 210 with a recess on two sides, which forms a kind of cavity.

According to one embodiment of the present invention, the drive unit comprises 110 a drive pulley 222 that are outside the case 212 is positioned. At least a second magnet 228 is on one surface of the drive pulley 222 leading to the housing 212 points, attached such that the at least one first magnet 226 and the at least one second magnet 228 attract each other. The at least one first magnet 226 is on one Surface of the cam disc 210 that go to the base 218 points through slots 208 attached through. If a north pole of the at least one first magnet 226 to the base 218 points, the south pole of the at least one second magnet 228 externally to the base 218 , which creates the attraction. An actuator 224 is with the drive pulley 222 for turning the cam disc 210 coupled in a first position for supplying the fluid and in a second position for flushing the fluid. The actuator 224 is a stepper motor or another motor.

According to one embodiment of the present invention, the drive unit 110 that the drive pulley 222 includes, annular and is around the housing 212 positioned around. The drive unit 110 further includes electromagnets arranged in the annular region. The electromagnets act as the actuator 224 . The way in which the electromagnets are energized decides the direction of rotation of the cam disc 210 . A controller controls the power supply to the electromagnets. Here are at least two first magnets 226 in the cam disc 210 provided such that the at least two magnets face the side wall 220 point. Different poles of the at least two first magnets 226 are arranged alternately.

3rd illustrates the fluid supply through the valve module according to an embodiment of the present invention. The first pair of channels 214 and the second pair of channels 216 are on an opposite side of the side wall 220 intended. The channels are referred to as bores for ease of explanation and are not intended to be construed in a manner that is outside the scope of the invention. In the case 212 includes the first pair of channels 214 a first hole 312 and a second hole 314 , and the second pair of channels 216 includes a third hole 316 and a fourth hole 318 . Equally includes in the valve plate 202 the first pair of valves 204 a first pressure valve 302 and a second pressure valve 304 and the second pair of valves 206 comprises a first supply valve 306 and a second supply valve 308 . The first pair of channels 214 is with the tank 112 flow coupled, and the second pair of channels 216 is with the feed unit 114 flow coupled.

The cam disc is in a first position 210 arranged so that the first hole 312 is closed, the second hole 314 is open, the third hole 316 is open and the fourth hole 318 closed is. The second suction valve 304 stands through the second hole 314 with the tank 112 in fluid communication, and the first supply valve 306 stands with the feed unit 114 in fluid communication. A first flow path (shown by the dashed arrow) is between the tank 112 to the feed unit 114 through the valve module 106 and the chamber 104 the pump 102 produced. If the pump 102 the suction stroke, the fluid is now in the chamber 104 through the second suction valve 304 sucked and pressurized during the feed stroke and through the first feed valve 306 left out. This is the operation of the pump 102 ended in a forward direction.

Both the first pair of channels 214 as well as the second pair of channels 216 is independent with the tank 112 or the feed unit 114 connected.

4th FIG. 5 illustrates the flushing of fluid through the valve module according to an embodiment of the present invention 3rd is in 4th a second position of the cam disc 210 shown. The flush request is received by the controller. The controller controls the actuator 224 for the corresponding rotation of the cam disc 210 to reach the second position. The first hole 312 is open, the second hole 314 is closed, the third hole 316 is closed and the fourth hole 318 is opened. This creates a second flow path (shown with a dashed arrow) between the tank 112 and the feed unit 114 produced. The fluid now flows in the reverse direction to the tank 112 . The cam disc 210 is rotated to a certain degree (such as 90 degrees). The first suction valve is now in place 302 and the feed unit 114 through the second position in fluid communication and the second supply valve 308 and the tank 112 are in flow communication. Now when the pump 102 performs the suction stroke, fluid from the supply unit 114 through the first suction valve 302 into the chamber 104 sucked and pressurized during the feed stroke and through the second feed valve 308 in the tank 112 left out. This is the operation of the pump 102 ended in the reverse direction.

The cam disc 210 is moved against a spring so that the cam disc 210 is returned to a standard position. The default position is the first position or the second position. The first position and the second position correspond to the feed position and the rinsing position or vice versa.

According to one embodiment of the present invention, all channels are 214 of the first pair in the side wall 220 interconnected such that they have a single channel coming out of the housing 212 leads out, form. With reference to 3rd or 4th are two openings in the outer surface of the housing 212 for the first pair of channels 214 visible. Instead of two openings provided, it is also possible to use a single opening. This is the first hole 312 and the second hole 314 in the side wall 220 connected with each other. All channels are alike 216 of the second pair in the side wall 220 interconnected such that they have a single channel coming out of the housing 212 leads out, form.

In one embodiment, the at least one first magnet comprises 226 just a circular magnet. In a further embodiment, the at least one first magnet comprises 226 two semicircular magnets. In yet another embodiment, the at least one first magnet comprises 226 three arc-shaped magnets that form a circular shape. In yet another embodiment, the at least one first magnet comprises 226 four magnets arranged as an arc of four sectors forming a circle, and the like. In yet another embodiment, the at least one first magnet comprises 226 more than four magnets, which are arranged in a suitable manner.

The at least one second magnet 228 is in the same number as the at least one first magnet 226 chosen. In a further embodiment, the at least one second magnet comprises 228 two semicircular magnets. In yet another embodiment, the at least one second magnet comprises 228 three arc-shaped magnets that form a circular shape. In yet another embodiment, the at least one second magnet comprises 228 four magnets arranged as an arc of four sectors forming a circle, and the like. In yet another embodiment, the at least one second magnet comprises 228 more than four magnets, which are arranged in a suitable manner.

Furthermore, is between the housing 212 and the valve plate 202 a sealing ring positioned.

According to one embodiment of the present invention, a solenoid drive valve module 106 provided with loop profile. The valve module 106 is a possible replacement for an additional flushing pump used in the exhaust aftertreatment system 100 is used. This will reduce the overall cost of the system 100 reduced and the design and construction and the hydraulic circuit are simplified. The valve module 106 is a possible replacement for an existing reversing valve used in the exhaust aftertreatment system 100 is used, which further simplifies the construction and hydraulic lines. The failure rate of the reversing valve is also eliminated. The valve module 106 has a simple construction and provides a very simple flow path, which also significantly reduces ice volume expansion problems. There is more freedom of installation because the refill protection is now ensured by valve positioning.

The valve module also synchronizes 106 , which is also called a rotary adapter, with the position of the plunger (piston, diaphragm, etc.) of the pump 102 for directing fluid from the tank 112 to the feed unit 114 and in the desired direction (forward - source to feed unit 114 and reverse - feed unit 114 to the source). The valves can be left out of operation in the same position as when flushing, thereby preventing the fluid from the tank 112 into the chamber 104 the pump 102 penetrates, and thus the ice resistance of the system 100 elevated. The magnetic drive is used to actuate the valve module 106 used, eliminating the need for rotary seals, and the only seal now required is between the housing 212 and the valve plate 202 and this is just a static seal.

It is understood that embodiments that are explained in the above description are only exemplary and do not limit the scope of the present invention. Many such embodiments and other modifications and changes to the embodiment described in the description are contemplated. The scope of the invention is limited only by the scope of the claims.

QUOTES INCLUDE IN THE DESCRIPTION

This list of documents listed by the applicant has been generated automatically and is only included for the better information of the reader. The list is not part of the German patent or utility model application. The DPMA assumes no liability for any errors or omissions.

Patent literature cited

• US 2010212303 [0002]

Claims (10)

A valve module (106) for a pump (102) for directing fluid in an exhaust gas aftertreatment system (100), the valve module (106) comprising: a housing (212) having a base (218) and a side wall (220) that extend extending therefrom, the side wall (220) comprising at least a first pair of channels (214) and a second pair of channels (216) configured to be in fluid communication with a tank (112) and a feed unit (114), respectively characterized by a cam (210) positioned in the housing (212) and rotatable; a valve plate (202) enclosing the cam plate (210) in the housing (212), the valve plate (202) having a first pair of valves (204) and a second pair of valves (206) communicating with the first pair of channels (214) or the second pair of channels (216); at least a first magnet (226), which is positioned in the cam disk (210), and a drive unit (110), which is designed to operate the cam disk (210) by the at least one first magnet (226). Valve module (106) after Claim 1 wherein a circumferential profile of the cam disc (210) is configured to fluidly couple one channel each from the first pair of channels (214) and the second pair of channels (216) to the first pair of valves (204) and the second pair of valves (206), respectively . Valve module (106) after Claim 1 wherein the drive unit (110) comprises: a drive pulley (222) positioned outside the housing (212); at least one second magnet (228) which is fastened on a surface of the drive disk (222) which faces the housing (212) in such a way that the at least one first magnet (226) and the at least one second magnet (228) are connected to one another and an actuator (224) coupled to the drive plate (222) for rotating the cam plate (210) to a first position to supply the fluid and to a second position to flush the fluid. Valve module (106) after Claim 1 wherein the first pair of channels (214) and the second pair of channels (216) are provided on an opposite side of the side wall (220). Valve module (106) after Claim 1 wherein both the first pair of channels (214) and the second pair of channels (216) are independently connected to the tank (112) and the feed unit (114), respectively. Valve module (106) after Claim 1 wherein all of the channels (214) of the first pair in the side wall (220) are interconnected to form a single channel leading out of the housing (212). Valve module (106) after Claim 1 , wherein all of the channels (216) of the second pair in the side wall (220) are interconnected to form a single channel leading out of the housing (212). Valve module (106) after Claim 1 wherein the at least one first magnet (226) comprises at least four magnets. Valve module (106) after Claim 3 wherein the at least one second magnet (228) comprises at least four magnets. Valve module (106) after Claim 1 wherein a sealing ring is positioned between the housing (212) and the valve plate (202).

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