Reagent injector

Abstract

An injector (110, 400, 600, 800, 900) for injecting a reagent has a first injector body (202, 402) defining a first end (805) and a second end (807). The first injector body (202, 402) further has an outlet opening (228, 428) located proximal to the second end (807). The injector (110, 400, 600, 800, 900) also has a valve assembly (216, 412) that is at least partially enclosed by the first injector body (202, 402). The valve assembly (216, 412) is configured to selectively discharge the reagent through the outlet port (228, 428) of the first body (202, 402). The injector (110, 400, 600, 800, 900) further comprises a cover element (801) coupled to the first injector body (202, 402) and designed to at least partially cover the second end (807) of the first injector body (202, 402).The cover element (801) has an integral flange section (803) for attaching the injector (110, 400, 600, 800, 900) to a component.

Description

[0001] This application claims priority over US patent application no. 16 / 044,980, filed on July 25, 2018, which is incorporated herein in its entirety by reference. TECHNICAL AREA

[0002] The present disclosure relates to injectors and in particular an injector for injecting a reagent into an exhaust stream of an engine. BACKGROUND

[0003] Lean-burn engines offer improved fuel efficiency by operating with an excess of oxygen, meaning a greater amount of oxygen than is required for complete combustion of the available fuel. Such engines are said to run "lean" or with a "lean mixture." However, this improved fuel economy compared to combustion in non-lean engines is offset by undesirable pollutant emissions, particularly nitrogen oxides (NOx).

[0004] A method used to reduce NOx emissions from lean-burn engines is known as selective catalytic reduction (SCR). When SCR is used, for example, to reduce NOx emissions from a diesel engine, an atomized reagent is injected into the engine's exhaust stream depending on one or more selected engine operating parameters, such as exhaust temperature, engine speed (rpm), or engine load, measured by engine fuel flow, turbocharger boost pressure, or exhaust NOx mass flow. The reagent / exhaust mixture is passed through a reactor containing a catalyst, such as activated carbon or metals like platinum, vanadium, or tungsten, which are capable of reducing the NOx concentration in the presence of the reagent. Typically, an injector is used to inject the reagent into the engine's exhaust stream.

[0005] An injector for injecting a reagent is already known from US2014054394A1. This injector has an injector body with an outlet opening. A valve assembly, which is at least partially enclosed by the injector body, is operatively connected to the outlet opening.

[0006] Aqueous urea solution is known as an effective reagent in SCR systems for diesel engines. However, the use of such an aqueous urea solution has many disadvantages. One of these disadvantages is the expansion of the aqueous urea solution when frozen, due to ice formation. Aqueous urea solution can be prone to freezing in certain situations, such as cold weather. The expansion of the aqueous urea solution when frozen can damage one or more components of the injector. The injector may then need to be repaired or replaced, resulting in downtime and increased costs. Freezing of the reagent can also lead to injector malfunction, resulting in undesirable deposits in the exhaust system. Similarly, any other fluid supply component can be damaged by freezing.

[0007] Accordingly, it may be desirable to provide an improved reagent injector that addresses some or all of these problems. SUMMARY

[0008] In one aspect of the present disclosure, an injector for injecting a reagent is provided. The injector comprises a first injector body defining a first end and a second end. The first injector body further comprises an outlet port located proximal to the second end. The injector further comprises a valve assembly that is at least partially enclosed by the first injector body. The valve assembly is configured to selectively dispense the reagent through the outlet port of the first injector body. The injector further comprises a cover element coupled to the first injector body and configured to at least partially cover the second end of the first injector body. The cover element has an integral flange section for attaching the injector to a component.

[0009] In another aspect of the present disclosure, an injector for injecting a reagent is provided. The injector comprises a first injector body defining a first end and a second end. The first injector body further comprises an outlet opening located proximal to the second end. The injector further comprises a second injector body coupled to the first injector body. The second injector body includes a reagent tube. The injector further comprises a valve assembly that is at least partially enclosed by the first injector body. The valve assembly is configured to selectively dispense the reagent through the outlet opening of the first injector body. The injector further comprises a cover element coupled to the first injector body and configured to at least partially cover the second end of the first injector body.The cover element has an integral flange section for attaching the injector to a component.

[0010] In one aspect of the present disclosure, an injector for injecting a reagent is provided. The injector comprises a first injector body defining a first end and a second end. The first injector body further comprises an outlet opening located proximal to the second end. The injector further comprises a second injector body coupled to the first injector body. The second injector body comprises a reagent tube. The injector further comprises a valve assembly that is at least partially enclosed by the first injector body. The valve assembly is configured to selectively dispense the reagent through the outlet opening of the first injector body. The injector further comprises a cover element coupled to the first injector body. The cover element has a shell section configured to at least partially cover the second end of the first injector body.The shell section and the first injector body define a fluid chamber. The cover element also has a flange section for attaching the injector to a component. The flange section is integrally formed with the shell section.

[0011] Further features and aspects of the present revelation will become apparent from the following description and the accompanying drawings. List of characters Fig. Figure 1 is a schematic diagram showing an exemplary exhaust aftertreatment system with a reagent injector according to one aspect of the present disclosure; Fig. Figure 2 is a perspective view of the reagent injector according to one aspect of the present disclosure; Fig. Figure 3 is a top view of the reagent injector. Fig. 2; Fig. Figure 4 is a cross-sectional view of the reagent injector made of Fig. 2; Fig. Figure 5 is another cross-sectional view of the reagent injector. Fig. 2; Fig. Figure 6 is another cross-sectional view of the reagent injector. Fig. 2; Fig. Figure 7 is a cross-sectional view of the reagent injector made of Fig. 2 in an extended configuration according to one aspect of the present disclosure; Fig. Figure 8 is a perspective view of a reagent injector according to another aspect of the present disclosure; Fig. Figure 9 is a cross-sectional view of the reagent injector made of Fig. 8; Fig. Figure 10 is another cross-sectional view of the reagent injector made of Fig. 8; Fig. Figure 11 is a cross-sectional view of the reagent injector made of Fig. 8 in an extended configuration according to one aspect of the present disclosure; Fig. Figure 12 is a cross-sectional view of a reagent injector according to another aspect of the present disclosure; Fig. Figure 13 is a cross-sectional view of the reagent injector made of Fig. 12 in an extended configuration according to one aspect of the present disclosure; Fig. Figure 14 is a perspective view of a reagent injector according to another aspect of the present disclosure; Fig. Figure 15 is a perspective view of a cover element of the reagent injector according to another aspect of the present disclosure; Fig. Figure 16 is a cross-sectional view of the reagent injector made of Fig. 14; Fig. Figure 17 is a cross-sectional view of the reagent injector made of Fig. 14 in an extended configuration according to one aspect of the present disclosure; and Fig. Figure 18 is a perspective view of a reagent injector according to another aspect of the present disclosure. DETAILED DESCRIPTION

[0012] Exemplary embodiments will now be described in more detail with reference to the accompanying drawings.

[0013] It should be noted that, although the present teachings can be described in connection with diesel engines and the reduction of nitrogen oxide (NOx) emissions, they can be used in connection with any one of several exhaust streams, such as, as non-limiting examples, those from gasoline, turbine, fuel cell, jet, or any other energy source that produces an exhaust stream. Furthermore, the present teachings can be used in connection with the reduction of any one of several undesirable emissions.

[0014] Where possible, the same reference symbols are used across drawings to designate the same or identical parts. Fig. Figure 1 illustrates an example exhaust system 100 for an engine 102 In Fig. 1 denotes solid lines between elements of the exhaust system 100 Fluid lines, while dashed lines indicate electrical connections. The engine 102 may be associated with a fuel source that, after consumption, produces exhaust gases that enter an exhaust pipe or exhaust line. 106 with an exhaust aftertreatment system 108 be released. The exhaust aftertreatment system 108 can an exhaust gas treatment component 112 exhibiting features downstream of the motor 102 is arranged. In the illustrated embodiment, the exhaust gas treatment component has 112 a component 114for selective catalytic reduction (SCR). The SCR component 114 It can include a catalyst bed for the catalytic reduction of NOx emissions in the exhaust gas stream. In other embodiments, the exhaust gas treatment component can 112 However, they also feature a diesel oxidation catalyst (DOC) and a diesel particulate filter (DPF). The exhaust aftertreatment component 112 It can also include components such as a temperature boosting device or a burner. 116 exhibit a temperature of the exhaust pipe 106 to increase the flowing exhaust gases. Increasing the exhaust gas temperature is advantageous for achieving the activation of the catalyst in the exhaust aftertreatment component. 112 in cold weather conditions and when starting the engine 102 and to initiate a regeneration of the exhaust gas treatment component 112 , if the exhaust gas treatment component 112 has a DPF.

[0015] To reduce the engine 102 To support the reduction of generated emissions, the exhaust aftertreatment system 108 an injector 110 for the periodic dosing of an exhaust aftertreatment fluid or reagent into the exhaust stream of the engine 102 up. The injector 110 can occur upstream of the exhaust gas treatment component 112 The injector is located and operational, ready to inject the reagent into the exhaust stream. 110 is connected to a supply line 124 in fluid connection with a reagent tank 120 and a pump 122 Optionally, a filter (not shown) can be installed between the pump. 122 and the reagent tank 120The reagent may be a urea solution, diesel exhaust fluid (DEF), AdBlue®, or similar. It should also be noted that one or more reagents may be available in the system and can be used individually or in combination. While it is in Fig. 1 a single injector 110 illustrated, however, several such injectors are also possible. 110 within the scope of the present disclosure. In a further embodiment, the injector can 110 It can also be used with an air-assisted injector.

[0016] The required amount of reagent can vary depending on the load, engine revolutions per minute (rpm), engine speed, exhaust gas temperature, exhaust gas flow rate, fuel injection timing, air pressure, relative humidity, engine coolant temperature, exhaust gas recirculation (EGR) rate, and the desired NOx reduction. A NOx sensor or gauge 118 is located downstream of the SCR component. 114 The NOx sensor 118 is positioned. It is operational and can output a signal indicating the exhaust NOx content to an engine control unit (ECU) 126. All or some of the engine operating parameters can be controlled by the ECU. 126 via an engine / vehicle data bus to an electronic injection control unit 128 will be delivered. The electronic injection control 128 can also be part of the ECU 126It may contain exhaust gas temperature, exhaust gas flow rate, and exhaust gas back pressure, which can be measured by appropriate sensors (not shown). The electronic injection control 128 can the injector 110 control the injection of the reagent into the engine's exhaust stream 102 to regulate.

[0017] Temperature-sensitive reagents, such as aqueous urea, tend to solidify at elevated temperatures of 300°C to 650°C, which can occur in an engine exhaust system. It may be desirable to keep the reagent below 140°C, and preferably in a lower operating range between 5°C and 95°C, to ensure that urea solidification is prevented. If the formation of solidified urea is allowed, it can contaminate moving parts, openings, and passages of the injector. 110 Contaminated. To maintain lower operating temperatures, the injector can 110It is supplied with a fluid that acts as a coolant. In the illustrated embodiment, the fluid differs from the reagent and is supplied by a cooling system. 130 supplied. In one embodiment, the cooling system 130 It could be an engine cooling system and include various components such as a radiator, a fan, a fluid tank, fluid lines, one or more valves, etc. In such a case, the fluid can be water or an aqueous solution. The fluid can be supplied to the injector. 110 via a fluid supply line 132 be supplied. A fluid return line 134 enables the fluid to be returned to the cooling system 130 for cooling and recirculation. In the fluid supply line. 132 and / or the fluid return line 134 One or more components (e.g., valves, filters, etc.) can be provided. In one embodiment, the cooling system can130 a separate pump to supply the injector 110 with the fluid. The pump can be controlled based on the temperature of the reagent.

[0018] Even if in Fig. 1. A separate cooling system 130 for the injector 110 As illustrated, alternative cooling configurations can also be considered within the scope of this disclosure. In one embodiment, the reagent can be placed inside the injector. 110 The water is recirculated to provide cooling. Instead of the cooling system 130 A return line (not shown) can be connected between the injector. 110 and the reagent tank 120 Provisions are made to allow reagent recirculation. The injector configuration 110 This can vary accordingly.

[0019] In some situations, for example at cold ambient temperatures, this can cause problems for the injector. 110The added reagent tends to freeze. Reagents such as aqueous urea tend to expand during freezing. This expansion in the frozen state is due to the formation of ice. Such expansion of the reagent can, due to the pressure exerted by the ice, damage one or more components of the injector. 110 damage. The injector 110 According to the present disclosure, it has a freeze protection function which, in an extended configuration, can allow expansion of the reagent, preventing damage to the injector. 110 This is prevented. The freeze protection function can also allow the injector to... 110 returns to a normal configuration when the reagent (i.e., the ice) has thawed.

[0020] The injector 110 will be with reference to Fig. 2 to Fig. 7 further described. The injector 110is used to inject a reagent into the exhaust stream of the engine. 102 (in Fig. (1 shown) provided. The injector 110 features a first injector body 202 (hereinafter referred to as “first body 202”), a second injector body 204 (hereinafter referred to as "second body 204"), a spring element 206 , an electrical connection box 210 (hereinafter referred to as "connection housing 210"), a fluid inlet pipe 212 , a fluid outlet pipe 214 and a valve assembly 216 up. The injector 110 can define a longitudinal axis 'L' that runs along a length of the injector 110 extends.

[0021] The first body 202 can be essentially hollow and at least partially encloses the valve assembly 216 Furthermore, the first body 202 It should be open at one top and one bottom end. A top cap 218can the upper end of the first body 202 at least partially cover the lower end of the first body. 202 can be achieved through a lower cap 220 It must be covered. A mounting flange. 222 Furthermore, at the lower end, it is connected to the first body 202 connected. The first body 202 features an extended section 223 for coupling with the mounting flange 222 up. The mounting flange 222 defines multiple flange openings 224 The flange openings 224 enable the attachment of the mounting flange 222 on the exhaust pipe 106 (in Fig. (1 shown) via mechanical fasteners such as screws. In an alternative embodiment, the mounting flange can be 222 with the first body 202 to be holistically educated. The first body 202 It also has a section of cable at the lower end. 226up. The section of the line 226 can have a hollow configuration. The line section 226 defines an outlet opening 228 for dispensing the reagent. The lower cap 220 and the mounting flange 222 can be done via various methods with the first body 202 be joined, for example by welding, brazing, adhesives, mechanical fasteners, interference fit, etc. In one embodiment, the lower cap 220 and / or the mounting flange 222 solvable with the first body 202 be connected.

[0022] The first body 202 It also has an upper section 227 up. The upper section 227 has a connection opening 229 for mounting the connection housing 210 through these. The extended section 223 can be removed from the upper section 227 extend from. The section of the line226 can also be removed from the upper area 227 extend from the top cap 218 can be found on the upper section 227 be arranged.

[0023] In the illustrated embodiment, the first body 202 Furthermore, there is a recessed section near the lower end. 230 on. The in-depth section 230 and the bottom cap 220 can together form a fluid chamber 232 define. The fluid chamber 232 can the line section 226 at least partially surrounded. The first body 202 It also features a pair of recording sections. 234 for at least partial accommodation of the fluid inlet and outlet pipes 212, 214. The intake sections 234 can be designed as rounded projections extending from the first body 202 extend from. The recording sections 234 can on an outer surface of the first body 202They are arranged at an angular distance from each other. The fluid inlet and outlet pipes 212 and 214 can be connected to the respective receiving sections. 234 of the first body 202 They can be joined by various methods, for example by welding, brazing, adhesives, mechanical fasteners, interference fits, etc. In one embodiment, the fluid inlet and outlet pipes 212, 214 can be detachably connected to the first body. 202 be connected. The recording sections 234 can also be in relation to the longitudinal axis 'L' of the injector 110 The fluid inlet and outlet pipes 212 and 214 can therefore also be inclined with respect to the longitudinal axis 'L'.

[0024] The fluid inlet and outlet pipes 212 and 214 can be hollow pipes through which a fluid can flow. The fluid inlet and outlet pipes 212 and 214 can be connected to the fluid chamber. 232are in fluid contact. Furthermore, the fluid inlet pipe defines 212 a fluid inlet 236 , which is in fluid connection with the fluid chamber 232 is arranged. Similarly, the fluid outlet pipe defines 214 a fluid outlet 238 , which is in fluid connection with the fluid chamber 232 is arranged. The fluid inlet 236 It can be configured to receive a fluid that is different from the reagent. In one embodiment, the fluid can be a coolant (e.g., water). The fluid inlet 236 Can the fluid from the cooling system 130 (in Fig. (shown in 1) via the fluid supply line 132 absorb. The absorption and discharge of the fluid are in Fig. 3 marked by the arrows 'A1'. Furthermore, the fluid outlet 238 the fluid into the fluid return line 134 discharge. The fluid can pass through the fluid inlet pipe. 212 into the fluid chamber232 flow, as through an exemplary fluid flow path 'F' in Fig. 5 indicated. A fluid passage 239 of the fluid inlet pipe 212 can be done with an angled drill hole 245 of the first body 202 in fluid contact. The angled bore 245 is connected to the fluid chamber 232 in fluid connection. Furthermore, the fluid can be in the fluid chamber. 232 the injector 110 through the fluid outlet pipe 214 exit. A flow path (not shown) of the fluid outlet pipe. 214 can be combined with another angled bore (not shown) of the first body 202 in fluid contact. This angled bore can be connected to the fluid chamber. 232 are in fluid contact. The fluid in the fluid chamber 232 can the line section 226 of the first body 202 cooling. This allows one or more components of the valve assembly to be cooled. 216, which are at least partially located in the section of the line 226 They are absorbed and cooled. This is done through the pipe section. 226 The flowing reagent can also be cooled. This can prevent solidification of the reagent due to high temperatures in the exhaust system. 100 Essentially, it prevents and improves the operational capability of the injector. 110 .

[0025] The second body 204 a test tube 240 up. The test tube 240 It can be essentially aligned parallel to the longitudinal axis 'L'. Furthermore, the test tube can 240 It should be essentially hollow and have open ends. The test tube 240 Can the reagent be supplied via the supply line? 124 from the pump 122 (in Fig. (1 shown) record. The test tube 240 Furthermore, the reagent is taken at a reagent inlet. 241 up. The test tube 240 an intake filter 242on, through which the reagent flows. The second body 204 Furthermore, it has a flange section 243 on, which extends from the test tube 240 extends from the flange section. 243 can have a stepped configuration and features a top surface 244 on.

[0026] In one embodiment, the second body 204 in relation to the first body 202 be mobile. Furthermore, the second body can 204 be movable along an axial direction 'D' which is essentially parallel to the longitudinal axis 'L' of the injector 110 The spring element 206 is between the first body 202 and the second body 204 positioned. Furthermore, the spring element can 206 the second body 204 movable with the first body 202 connect. In one embodiment, the spring element can be 206It is essentially a flat spring. Furthermore, the spring element can 206 be formed by at least one stamping or forming process. In a further embodiment, the spring element can 206 The spring element must be made of a metal or a metal alloy. 206 has a main section 246 , at least one elongated section 248 and at least one intermediate section 250 on, which between the main section 246 and at least one elongated section 248 is arranged. In the illustrated embodiment, the spring element has 206 a pair of elongated sections 248 and a couple of intermediate sections 250 In an alternative embodiment, each of the two elongated sections can 248 have a zigzag shape to allow for additional movement of the second body 204 to enable. Each of the two intermediate sections250 is between the main section 246 and a corresponding elongated section 248 arranged. The main section 246 is on the flange section 243 of the test tube 240 arranged. Furthermore, the main section 246 against the top 244 of the flange section 243 pressed. In another embodiment, the main section 246 with an essentially circular area of ​​the flange section 243 of the test tube 240 be connected. The main section 246 can have a ring-shaped form that has a main opening 252 defined. Even if, in the illustrated embodiment, the main opening 252 which has an essentially circular shape, other shapes of the main opening are possible 252 to be considered within the scope of the present disclosure. Such forms of main opening 252They can be polygonal, elliptical, etc. The main opening 252 is at least partially around the test tube 240 arranged around it. The test tube 240 can therefore pass through the main opening 252 extend through it. In one embodiment, the main section 246 on the flange section 243 of the second body 204 be pressed on. In other embodiments, the main section can be 246 through various processes such as welding, brazing, adhesives, mechanical fasteners, etc. on the second body 204 be attached. In another embodiment, the main section 246 solvable with the second body 204 be connected.

[0027] The intermediate sections 250 can originate from diametrically opposed sides of the main section 246extend from. In an undeformed or normal state, each of the intermediate sections has 250 a curved shape that extends from the main section 246 extends upwards and then to the respective elongated section 248 curves downwards. In particular, each intermediate section shows 250 a first section 250a , which differs from the main section 246 extends upwards, and a second section 250b up, which curves downwards and onto the respective elongated section 248 meets. In one embodiment, the first section can 250a have an essentially planar shape. The first section 250a is furthermore, in the undeformed state or in the undeformed configuration with an angle 'Ag' (in Fig. 6 shown) in relation to the main section 246 inclined. The second section 250b It has a curved shape and connects the first section 250awith the respective elongated section 248 Each intermediate section 250 is designed to deform in order to accommodate the movement of the second body 204 relative to the first body 202 to enable this. In particular, each intermediate section deforms. 250 , to initiate a movement of the second body 204 away from the first body 202 to enable movement along the axial direction 'D'. In the deformed state or deformed configuration, as shown in Fig. 7 shown, the first section 250a essentially parallel to the main section 246 aligned, i.e., the angle between them is essentially zero. After each intermediate section 250 is deformed or bent to a point where the first section 250a essentially parallel to the main section 246 If the spring element is aligned 206the maximum axial movement of the second body 204 relative to the first body 202 limit. A distance 'D1' (in Fig. (as shown in 7) can be the maximum axial movement of the second body 204 relative to the first body 202 correspond. The distance 'D1' can be the distance between the second body. 204 and the rod piece 256 be.

[0028] Each elongated section 248 A first region 248a , a second region 248b and a third region 248c on, which between the first and second region 248a , 248b is arranged. The first region 248a extends from the second section 250b of the respective intermediate section 248 out. The second region 248b can with the first body 202 be connected. The first region 248a and the second region 248bEach can have a substantially planar shape. In the illustrated embodiment, a width 'W1' (in Fig. 2 shown) of the first region 248a greater than a width 'W2' of the second region 248b Furthermore, the third region 248c a tapered form and connects the first region 248a with the second region 248b In one embodiment, the second region 248b of the elongated section 248 by welding with the first body 202 connected. In other embodiments, the second region can 248b through various processes such as brazing, mechanical fasteners, adhesives, etc. with the first body 202 be connected. In some embodiments, the first and / or third region may be connected. 248a , 248c of the elongated section 248 also through various processes with the first body 202be connected. In another embodiment, each elongated section can be 248 with the first body 202 be detachably connected by any non-permanent joining method. Such a detachable connection can make it possible to separate the second body. 204 from the first body 202 to remove in order to facilitate the maintenance and / or replacement of one or more internal components (e.g., the valve assembly). 216 ) of the injector 110 to enable this. In another embodiment, each elongated section can 248 with the first body 202 be connected by a snap connection.

[0029] In one embodiment, the spring element 206 pre-tensioned to form the second body 204 in the direction of the first body 202 to pre-tension. In another embodiment, the spring element 206 furthermore configured so that it is the valve assembly 216in the direction of the first body 202 pre-tensions or presses. The second body 204 can react to the expansion of the reagent during freezing against the preload of the spring element. 206 move the spring element 206 is furthermore configured to ensure maximum movement of the second body in response to the expansion of the reagent during freezing. 204 relative to the first body 202 limited. In particular, the spring element 206 exert a preload force 'Fb' against a pressure 'P' exerted by the reagent during freezing. The reagent can expand in the frozen state due to ice formation. The expansion of the reagent is thus caused by the expansion of ice. The pressure 'P' is exerted by ice that forms as the reagent freezes. In one embodiment, it can limit the movement of the second body. 204to be a final attack.

[0030] The valve assembly 216 (in Fig. 4 to Fig. 7 shown) has an electromagnet 254 , a piece of rod 256 , an outer pipe 258 , an inner tube 260 , a valve element 262 , a return spring 264 , a seating element 266 , a nozzle section 268 and an end element 270 in one embodiment, the valve assembly can be 216 This involves a removable or replaceable modular assembly. The valve assembly 216 It can therefore be removed from the injector if needed. 110 can be removed and replaced by another valve assembly. In alternative embodiments, the valve assembly 216 possibly not from the injector 110 removable. The valve assembly 216 is configured to selectively expel the reagent through the outlet opening. 228of the first body 202 hands over.

[0031] The electromagnet 254 has a coil 272 , a coil former 274 , a pipe 276 and an end cap 278 up. The electromagnet 254 can within the first body 202 be arranged. The coil 272 includes one around the coil body 274 wound wire coil. The tube 276 surrounds the coil body 274 at least partially. The pipe 276 can on one shoulder of the first body 202 be stored. The end cap 278 covers the coil body 274 and the pipe 276 at least partially from above. The end cap 278 and the pipe 276 can create a flux frame of the electromagnet 254 form. The connection housing 210 is with the electromagnet 254 connected. In particular, the connection housing 210with the flux frame of the electromagnet 254 be connected. In a groove of the terminal housing. 210 can a retaining ring 280 be provided for. The retaining ring 280 can also be located on another shoulder of the first housing 202 be stored. The retaining ring 280 can the connection housing 210 within the first housing 202 to hold and / or support. In another embodiment, the connection housing can 210 on the electromagnet 254 be molded. In other embodiments, the connection housing can be 210 through various processes such as welding, brazing, mechanical fasteners, adhesives, interference fits, etc. with the electromagnet 254 be connected. In one embodiment, the connection housing 210 Solvable with an electromagnet 254 be connected. The power supply to the coil 272can be done via one or more wires (not shown) passing through the terminal box 210 run. The coil 272 can in response to a signal from the electronic injection control 128 be excited. In addition, a sealing element is required. 282 (e.g. an O-ring) between the pipe 276 and the first body 202 installed. The sealing element 282 can prevent the reagent and / or exhaust gases from escaping.

[0032] The rod piece 256 can be at least partially within the electromagnet 254 and the connection housing 210 It should be recorded. The rod piece. 256 defines a bore running through this 284 In the illustrated embodiment, the bore is 284 for a countersink hole. The hole 284 stands with a passage 286 of the test tube 240in fluid compound. Furthermore, the test tube 240 at least partially in a wider section of the borehole 284 of the rod piece 256 recorded. Between the second body 204 and the valve assembly 216 is a sealing element 287 arranged. In particular, the sealing element 287 between the test tube 240 and the rod piece 256 arranged. In another embodiment, the sealing element can 287 between the first body 202 and the second body 204 be arranged. The sealing element 287 It could be an O-ring. Furthermore, the sealing element... 287 in a groove 289 of the rod piece 256 included. In an alternative embodiment, the sealing element can 287 in a groove (not shown) of the test tube 240 be included. The sealing element 287Can the reagent leak from the injector? 110 prevent. The second body 204 including the test tube 240 can occur in response to an expansion of the reagent during freezing relative to the first body 202 be moved. The spring element 206 can the axial movement of the second body 204 limit. In a displaced state, as in Fig. Figure 7 shows the test tube 240 and the rod piece 256 an expansion chamber 291 Define between themselves. The expansion chamber 291 This allows the reagent to expand during freezing. The expansion chamber 291 It can therefore serve as a reservoir for the freezing reagent. In particular, the expansion chamber can 291They serve as a reservoir for ice that forms when the reagent freezes. Since the ice can expand, it can damage various components of the injector. 110 This can be prevented. Furthermore, the sealing element can 287 a leakage of the reagent from the expansion chamber 291 prevent. A volume of the expansion chamber 291 It can be optimized to allow sufficient expansion of ice formed in the frozen state of the reagent.

[0033] The inner tube 260 defines a pipe bore 288 , which is connected with the drilling 284 of the rod piece 256 in fluid contact. In one embodiment, the inner tube 260 , the rod piece 256 and the test tube 240 be aligned coaxially to each other. In one embodiment, the inner tube 260 made of a magnetic material (for example, stainless steel) 430) be manufactured so that the electrical excitation of the coil 272 a magnetic field is generated that the inner tube 260 in the direction of the rod piece 256 urges.

[0034] The return spring 264 is between the respective shoulders of the rod section 256 and the inner tube 260 recorded. Furthermore, the inner tube 260 in the outer pipe 258 Included. The outer pipe 258 is at least partially in the electromagnet 254 and the section of the line 226 of the first body 202 recorded. The inner tube 260 further defines several pipe holes 292 . At the pipe holes 292 These could be through holes located on a wall of the inner pipe. 260 are defined. In one embodiment, the inner tube can be 260 two such pipe holes 292 exhibiting diametrically opposed features. The pipe holes 292can create a fluid connection between the pipe bore 288 and a pipe chamber 294 enable. The pipe chamber 294 can be at least partially achieved by drilling a hole in the outer pipe 258 be defined.

[0035] The valve element 262 is connected to the inner tube at one end 260 connected. The valve element 262 can be joined to the inner tube via various methods such as welding, adhesives, interference fits, brazing, mechanical fasteners, etc. 260 be connected. The valve element 262 may also have a flange that forms one end of the inner tube 260 supports. The return spring 264 Normally, the inner tube is pushed 260 and the valve element 262 against a valve seat of the seat element 266 In a closed position, a plug section of the valve element is located. 262on the valve seat and closes a seat opening of the seat element. 266 The plug section can be attached to one end of a valve stem of the valve element. 262 be arranged. When the coil is excited 272 can the inner tube 260 in the direction of the rod piece 256 move, thereby moving the valve element 262 from the seating element 266 is moved away. The plug section of the valve element. 262 It is thus shifted away from the valve seat in an open position. In the open position, the reagent can pass through the seat opening of the seat element. 266 flow.

[0036] The nozzle section 268 can be attached to the seating element 266 adjacent. The nozzle section 268 This can atomize the reagent flowing through it. Thus, the nozzle section can 268 to create a spray mist from the reagent. The end element 270 can the nozzle section 268inside the outer tube 258 support. The end element 270 It further defines a bore through which the atomized reagent can flow. The reagent spray can be expelled through the outlet opening. 228 of the first body 202 leak if the injector 110 the reagent in the exhaust stream or flow of the engine 102 gives (in Fig. 1 shown).

[0037] During operation of the injector 110 The reagent is introduced at the reagent inlet. 241 recorded. An exemplary reagent flow path 'R' is shown in Fig. Figure 6 shows the reagent flowing through the inlet filter. 242 and the passage 286 of the test tube 240 The reagent continues to flow into the borehole. 284 of the rod piece 256 and into the pipe bore 288 of the inner tube 260 The reagent can enter the inner tube 260 through the pipe holes 290exit and enters the pipe chamber 294 one. In the closed position of the valve element 262 can the plug section of the valve element 262 prevent the reagent from escaping the tube chamber 294 exits. The return spring 264 the valve element pushes 262 into the closed position. When the coil is excited 272 can the inner tube 260 against the rod piece 256 be forced. The inner tube 260 can the valve element 262 contrary to the preload of the return spring 264 from the seating element 266 move away. The plug section of the valve element. 262 is therefore from the valve seat of the seat element 266 be moved away. In the open position of the valve element. 262 Can the reagent pass through the opening of the seat element? 266 into the nozzle section 268 flow. The reagent can pass through the nozzle section.268 be atomized. The atomized reagent can then be used in the injector. 110 through the bore of the end element 270 and the outlet opening 228 of the first body 202 It is released in the form of a spray mist. The reagent spray mist can enter the engine's exhaust stream. 102 enter and upon passing the SCR component 114 to enable selective catalytic reduction (SCR) of NOx emissions in the exhaust stream. If injection of the reagent into the exhaust stream is not required, the coil can 272 be switched off. The return spring 264 can the valve element 262 move into the closed position when no opposing electromagnetic force is present.

[0038] The injector 110 can be caused by the fluid inlet 236 of the fluid inlet pipe 212 The absorbed fluid is cooled, as seen through the fluid flow path 'F' in Fig. 5 shown. Furthermore, the fluid in the fluid chamber 232 the injector 110 through the fluid outlet pipe 214 exit. The fluid in the fluid chamber 232 can the line section 226 of the first body 202 cooling. The volume of the fluid in the fluid chamber 232 It can be optimized to ensure efficient cooling. Thus, one or more components of the valve assembly can be optimized. 216 , which are at least partially located in the section of the line 226 They are recorded and cooled. This is in the tube chamber. 294 The reagent can also be cooled. This can prevent solidification of the reagent due to high temperatures in the exhaust system. 100 essentially prevent it.

[0039] In a normal position of the second body 204 is as in Fig. Figure 6 illustrates the spring element 206 so pre-tensioned that it forms the second body 204in the direction of the first body 202 Pre-tensioned. This can correspond to an unfrozen state of the reagent. In the normal position, the flange section can 243 of the second body 204 furthermore, on one end of the rod piece 256 The reagent can expand when frozen. In the illustrated embodiment, the injector can 110 The reagent is essentially rigid in the radial direction. Consequently, it can expand along the axial direction 'D'. Furthermore, due to this expansion, the freezing reagent can exert a pressure 'P' on the second body. 204 exert, thereby the second body 204 along the axial direction 'D' from the first body 202 is displaced. The pressure 'P' can be exerted by expanding ice that forms in the frozen state of the reagent. The spring element 206 It also deforms to accommodate the movement of the second body204 to enable along the axial direction 'D'. In particular, the intermediate sections can 250 of the spring element 206 deform to change the movement of the second body 204 relative to the first body 202 to enable this. The spring element 206 However, the applied preload force 'Fb' can influence the movement of the second body. 204 limit and the second body 204 in the (in Fig. 7 shown) distance 'D1' from the end of the rod piece 256 Hold. This can be an extended position or configuration of the second body. 204 correspond to the preload force 'Fb' exerted by the spring element. 206 The force exerted due to the preload can thus counteract the pressure 'P' exerted by the reagent in its frozen state. The force exerted by the movement of the second body 204 formed expansion chamber 291It can also provide space for the reagent to expand during freezing. The sealing element 287 Can the reagent leak from the injector? 110 prevent this. During subsequent thawing of the reagent, it may contract. The pressure 'P' may then no longer be exerted on the second body. 204 exerted. The spring element 206 can the second body 204 in the direction of the first body 202 Pre-tension after the ice has thawed. In particular, the spring element can 206 the second body 204 move and the second body 204 towards the end of the rod section 256 hold onto.

[0040] The injector 110 Thus, a spring element can be 206 They feature comprehensive freeze protection, which allows for safe reagent expansion during freezing. This prevents damage to the injector. 110This is essentially prevented by the freezing reagent. Furthermore, the sealing element can be used to prevent this. 287 Leakage of the reagent is prevented. After the reagent has thawed, the spring element moves. 206 the second body 204 furthermore, into its normal position.

[0041] Fig. 8 to Fig. Figure 11 illustrates an injector. 400 according to another aspect of the present disclosure. The injector 400 can be used to inject a reagent into the exhaust stream of the engine. 102 (in Fig. (1 shown) is provided. The injector 400 features a first injector body 402 (hereinafter referred to as “first body 402”), a second injector body 404 (hereinafter referred to as "second body 404"), a spring element 406 , a reagent outlet tube 408 , an electrical connection box 410(hereinafter referred to as "connection housing 410") and a valve assembly 412 up. The injector 400 can define a longitudinal axis 'L1' that runs along a length of the injector 400 extends.

[0042] The first body 402 can be essentially hollow and at least partially encloses the valve assembly 412 Furthermore, the first body 402 an upper section 414 and a lower section 416 up. The upper section 414 It may be open at one end. A top cap 418 can the upper end of the upper section 414 at least partially cover the upper section. 414 can have an essentially cylindrical shape. Furthermore, the lower section can 416 have a tapered shape. The first body 402 It also features a mounting flange 422on. In the illustrated embodiment, the mounting flange 422 with the first body 402 integrally designed. The mounting flange 422 defines multiple flange openings 424 The flange openings 424 enable the attachment of the mounting flange 422 on the exhaust pipe 106 (in Fig. 1 shown) via mechanical fasteners such as screws.

[0043] The lower section 416 defines an outlet opening 428 for the release of the reagent into the exhaust gas stream. The upper section 414 of the first body 402 has a connection opening 429 for mounting the connection housing 410 through these. The first body 402 It also features a recording section 434 for at least partial absorption of the reagent outlet tube 408 up. The recording section 434can be in relation to the longitudinal axis 'L1' of the injector 400 be inclined. The reagent outlet tube 408 It should therefore also be inclined with respect to the longitudinal axis 'L1'. The reagent outlet tube 408 can be done via various methods with the first body 402 be connected, for example by welding, brazing, adhesives, mechanical fasteners, interference fit, etc. In one embodiment, the reagent outlet tube 408 solvable with the first body 402 be connected. The reagent outlet tube 408 furthermore, it has a flange section arranged on it. 910 up. The flange section 910 has a top 911 on.

[0044] The reagent outlet tube 408 It can be a hollow tube through which the reagent can flow. The reagent outlet tube 408 defines a reagent outlet 436 , which is in fluid connection with a reagent chamber 438of the first body 402 is arranged. Furthermore, the reagent outlet is 436 to the exhaust pipe 106 (shown in FIG.) spaced apart, with the reagent chamber 438 is located between them. In the illustrated embodiment, the reagent outlet can be 436 an orifice that prevents the reagent from being discharged from the reagent outlet tube 408 controls. The reagent chamber 438 can be done through the lower section 416 be defined. A flow passage 437 (in Fig. 9 shown) of the reagent outlet tube 408 can be done with an angled drill hole 439 of the first body 402 in fluid contact. The angled bore 439 can be done with the test chamber 438 in fluid connection. Furthermore, the reagent outlet can 436 discharge the fluid into a return line (not shown) that connects to the reagent tank 120 (in Fig. (shown in 1) is connected. The reagent in the test chamber 438 can one or more components of the valve assembly 412 at least partially surround and cool one or more components. Furthermore, a volume of the reagent can be placed in the test chamber. 438 be optimized to provide efficient cooling of one or more components of the valve assembly 412 to ensure.

[0045] The second body 404 a test tube 440 up. The test tube 440 can be essentially aligned parallel to the longitudinal axis 'L1'. Furthermore, the test tube can 440 It should be essentially hollow and have open ends. The test tube 440 Can the reagent be supplied via the supply line? 124 from the pump 122 (in Fig. (1 shown) record. The test tube 440 Furthermore, the reagent is taken at a reagent inlet. 441 up. The test tube440 an intake filter 442 on, through which the reagent flows. The second body 404 Furthermore, it has a flange section 443 on, which extends from the test tube 440 extends from the flange section. 443 has a top 444 The configuration of the reagent inlet and outlet as shown in Fig. 8 to Fig. Figure 11 is shown as an example, and alternative configurations are possible within the scope of this disclosure. For example, the test tube 440 have a reagent outlet, while the tube 408 may have a reagent inlet.

[0046] In one embodiment, the second body 404 in relation to the first body 402 be mobile. Furthermore, the second body can 404 be movable along an axial direction 'Da' which is essentially parallel to the longitudinal axis 'L1' of the injector 400The spring element 406 is between the first body 402 and the second body 404 positioned. Furthermore, the spring element can 406 the second body 404 movable with the first body 402 connect. In one embodiment, the spring element can be 406 It is essentially a flat spring. Furthermore, the spring element can 406 be formed by at least one stamping or forming process. In a further embodiment, the spring element can 406 The spring element must be made of a metal or a metal alloy. 406 has a main section 446 , at least one elongated section 448 and at least one intermediate section 450 on, which between the main section 446 and at least one elongated section 448 is arranged. In the illustrated embodiment, the spring element has406 a pair of elongated sections 448 and a couple of intermediate sections 450 In an alternative embodiment, each of the two elongated sections can 448 have a zigzag shape to allow for additional movement of the second body 404 to enable. Each of the two intermediate sections 450 is between the main section 446 and a corresponding elongated section 448 arranged. The main section 446 is on the flange section 443 of the test tube 440 arranged. Furthermore, the main section 446 against the top 444 of the flange section 443 pressed. In another embodiment, the main section 446 with an essentially circular area of ​​the flange section 443 of the test tube 440 be connected. The main section 446can have a ring-shaped form that has a main opening 452 defined. Even if, in the illustrated embodiment, the main opening 452 which has an essentially circular shape, other shapes of the main opening are possible 452 to be considered within the scope of the present disclosure. Such forms of main opening 452 They can be polygonal, elliptical, etc. The main opening 452 is at least partially around the test tube 440 arranged around it. The test tube 440 can therefore pass through the main opening 452 extend through it. In one embodiment, the main section 446 on the flange section 443 of the second body 404 be pressed on. In other embodiments, the main section can be 446 through various processes such as welding, brazing, adhesives, mechanical fasteners, etc. on the second body 404be attached. In another embodiment, the main section 446 solvable with the second body 404 be connected.

[0047] The intermediate sections 450 can originate from diametrically opposed sides of the main section 446 extend from. In an undeformed or normal state, each of the intermediate sections has 450 a curved shape that extends from the main section 446 extends upwards and then to the respective elongated section 448 curves downwards. In particular, each intermediate section shows 450 a first section 450a , which differs from the main section 446 extends upwards, and a second section 450b up, which curves downwards and onto the respective elongated section 448 meets. In one embodiment, the first section can 450a have an essentially planar shape. The first section450a is furthermore, in its undeformed state or in its undeformed configuration with an angle 'Ah' (in Fig. 10 shown) in relation to the main section 446 inclined. The second section 450b It has a curved shape and connects the first section 450a with the respective elongated section 448 Each intermediate section 450 is designed to deform in order to accommodate the movement of the second body 404 relative to the first body 402 to enable this. In particular, each intermediate section deforms. 450 , to initiate a movement of the second body 404 away from the first body 402 to enable movement along the axial direction 'Da'. In the deformed state or deformed configuration as in Fig. The first section is shown in section 11. 450a essentially parallel to the main section 446aligned, i.e., the angle between them is essentially zero. After each intermediate section 450 is deformed or bent to a point where the first section 450a essentially parallel to the main section 446 If the spring element is aligned 406 the maximum axial movement of the second body 404 relative to the first body 402 limit. A distance 'D2' (in Fig. (11 shown) can be the maximum axial movement of the second body 404 relative to the first body 402 correspond. The distance 'D2' can be the distance between the second body. 404 and the rod piece 456 be.

[0048] Each elongated section 448 It has a substantially planar shape. In one embodiment, each elongated section 448 by welding with the first body 402connected. In other embodiments, each elongated section can 448 through various processes such as brazing, mechanical fasteners, adhesives, etc. with the first body 402 be connected. In another embodiment, each elongated section can be 448 with the first body 402 be detachably connected by any non-permanent joining method. Such a detachable connection can make it possible to separate the second body. 404 from the first body 402 to remove in order to facilitate the maintenance and / or replacement of one or more internal components (e.g., the valve assembly). 412 ) of the injector 400 to enable this. In another embodiment, each elongated section can 448 with the first body 402 be connected by a snap connection.

[0049] In one embodiment, the spring element 406pre-tensioned to form the second body 404 in the direction of the first body 402 to pre-tension. In another embodiment, the spring element 406 furthermore configured so that it is the valve assembly 412 in the direction of the first body 402 pre-tensions or presses. The second body 404 can react to the expansion of the reagent during freezing against the preload of the spring element. 406 move the spring element 406 is furthermore configured to ensure maximum movement of the second body in response to the expansion of the reagent during freezing. 404 relative to the first body 402 limited. In particular, the spring element 406exert a preload force 'Fs' against a pressure 'Pa' exerted by the reagent during freezing. The reagent can expand in the frozen state due to ice formation. The expansion of the reagent thus occurs due to the expansion of ice. The pressure 'Pa' is exerted by ice that forms as the reagent freezes. In one embodiment, this can limit the movement of the second body. 404 to be a final attack.

[0050] The valve assembly 412 (in Fig. 9 to Fig. (11 shown) has an electromagnet 454 , a piece of rod 456 , an outer pipe 458 , an inner tube 460 , a valve element 462 , a return spring 464 , a seating element 466 , a nozzle section 468 and an end element 470 in one embodiment, the valve assembly can be 412This involves a removable or replaceable modular assembly. The valve assembly 412 It can therefore be removed from the injector if needed. 400 The valve assembly can be removed and replaced with a different valve assembly. 412 is configured to selectively expel the reagent through the outlet opening. 428 of the first body 402 emits. The electromagnet 454 has a coil 472 , a coil former 474 , a pipe 476 and an end cap 478 up. The electromagnet 454 can within the first body 402 be arranged. The structures and functionalities of the various components of the valve assembly. 412 and the electromagnet 454 They are largely similar to those of the valve assembly 216 or the electromagnet 254 , which above with reference to Fig. 2 to Fig. 7 were described. Therefore, some details of the valve assembly will not be discussed. 412 and the electromagnet 454 not included in the present disclosure.

[0051] A retaining ring 480 can the connection housing 410 within the first housing 402 to hold and / or support. Additionally, it includes a sealing element. 482 (e.g. an O-ring) between the pipe 476 and the first body 402 installed. The sealing element 482 can prevent the reagent from leaking out. The rod piece 456 defines a bore running through this 484 The drilling 484 stands with a passage 486 of the test tube 440 in fluid compound. Furthermore, the test tube 440 at least partially in the borehole 484 of the rod piece 456 recorded.

[0052] Between the second body 404 and the valve assembly412 is a sealing element 487 arranged. Specifically, the sealing element is 487 between the test tube 440 and the rod piece 456 arranged. In an alternative embodiment, the sealing element can 487 between the first body 402 and the second body 404 be arranged. The sealing element 487 It could be an O-ring. Furthermore, the sealing element... 487 in a groove 489 of the test tube 440 recorded. The sealing element 487 Can the reagent leak from the injector? 400 impede.

[0053] The second body 404 including the test tube 440 can in response to an expansion of the reagent during freezing from the first body 402 be moved. The spring element 406 can the axial movement of the second body 404 limit. In a displaced state, such as in Fig. Figure 11 shows the test tube 440 and the rod piece 456 an expansion chamber 491 Define between themselves. The expansion chamber 491 This allows the reagent to expand during freezing. The expansion chamber 491 It can therefore serve as a reservoir for the freezing reagent. Specifically, the expansion chamber can 491 They serve as a reservoir for ice that forms when the reagent freezes. Since the ice can expand, it can damage various components of the injector. 400 This can be prevented. Furthermore, the sealing element can 487 a leakage of the reagent from the expansion chamber 491 prevent. A volume of the expansion chamber 491 It can be optimized to allow sufficient expansion of ice formed in the frozen state of the reagent.

[0054] The inner tube 460 defines a pipe bore 488, which is connected with the drilling 484 of the rod piece 456 in fluid contact. In one embodiment, the inner tube 460 , the rod piece 456 and the test tube 440 be aligned coaxially with each other. The return spring 464 is between the respective shoulders of the rod section 456 and the inner tube 460 recorded. Furthermore, the inner tube 460 in the outer pipe 458 Included. The outer pipe 458 is at least partially in the electromagnet 454 and the lower section 416 of the first body 402 recorded. The inner tube 460 further defines several pipe holes 492 The pipe holes 492 can create a fluid connection between the pipe bore 488 and a pipe chamber 494 enable. The pipe chamber 494 can be at least partially achieved by drilling a hole in the outer pipe 458be defined. The outer tube 458 It also has a hole 496 up, which is between the pipe chamber 494 of the outer tube 458 and the test chamber 438 of the first body 402 establishes a fluid compound. The reagent in the reagent chamber 438 can one or more components of the valve assembly 412 cool.

[0055] The valve element 462 is connected to the inner tube at one end 460 connected. The return spring 464 Normally, the inner tube is pushed 460 and the valve element 462 against a valve seat of the seat element 466 In a closed position, a plug section of the valve element is located. 462 on the valve seat and closes a seat opening of the seat element. 466 When the coil is excited 472 can the inner tube 460 in the direction of the rod piece 456move, thereby moving the valve element 462 from the seating element 466 is moved away. The plug section of the valve element. 462 It is thus shifted away from the valve seat in an open position. In the open position, the reagent can pass through the seat opening of the seat element. 466 flow.

[0056] The nozzle section 468 can be attached to the seating element 466 adjacent. The nozzle section 468 This can atomize the reagent flowing through it. The end element 470 can the nozzle section 468 inside the outer tube 458 support. The end element 470 It further defines a bore through which the atomized reagent can flow. The reagent spray can be expelled through the outlet opening. 428 of the first body 402 leak if the injector 400 the reagent in the exhaust stream or flow of the engine 102 gives (in Fig. 1 shown).

[0057] During operation of the injector 400 The reagent is introduced at the reagent inlet. 441 An example reagent flow path 'R1' is shown in Fig. Figure 9 shows the reagent flowing through the inlet filter. 442 and the passage 486 of the test tube 440 The reagent continues to flow into the borehole. 484 of the rod piece 456 and into the pipe bore 488 of the inner tube 460 The reagent can enter the inner tube 460 through the pipe holes 490 exit and enters the pipe chamber 494 one. In the closed position of the valve element 462 can the plug section of the valve element 462 prevent the reagent from escaping the tube chamber 494 exits. The return spring 464 the valve element pushes 462 into the closed position. When the coil is excited 472 can the inner tube 460 against the rod piece456 be forced. The inner tube 460 can the valve element 462 contrary to the preload of the return spring 464 from the seating element 466 move away. The plug section of the valve element. 462 is therefore from the valve seat of the seat element 466 be moved away. In the open position of the valve element. 462 Can the reagent pass through the opening of the seat element? 466 into the nozzle section 468 flow. The reagent can pass through the nozzle section. 468 The reagent is atomized. The atomized reagent can then be injected into the injector. 400 through the bore of the end element 470 and the outlet opening 428 of the first body 402 It is released in the form of a spray mist. The reagent spray mist can enter the engine's exhaust stream. 102 enter and upon passing the SCR component 114to enable selective catalytic reduction (SCR) of NOx emissions in the exhaust stream. If injection of the reagent into the exhaust stream is not required, the coil can 472 be switched off. The return spring 464 can the valve element 462 move into the closed position when no opposing electromagnetic force is present.

[0058] As indicated by the reagent flow path 'R1', the reagent can be in the tube chamber 494 through the hole 496 into the test chamber 438 flow. The reagent in the test chamber 438 can one or more components of the valve assembly 412 Cool. A shape and / or dimensions of the hole. 496 can be adapted to the cooling requirements of the valve assembly 412 The volume of the reagent in the test chamber must be selected. 438 It can also be optimized to ensure efficient cooling.

[0059] In a normal position of the second body 404 is as in Fig. 10 illustrates the spring element 406 so pre-tensioned that it forms the second body 404 in the direction of the first body 402 Pre-tensioned. This can correspond to an unfrozen state of the reagent. In the normal position, the flange section can 443 of the second body 404 furthermore, on one end of the rod piece 456 The reagent can expand when frozen. In the illustrated embodiment, the injector can 400 The reagent is essentially rigid in the radial direction. Consequently, it can expand along the axial direction 'Da'. Furthermore, due to this expansion, the freezing reagent can exert a pressure 'Pa' on the second body. 404 exert, thereby the second body 404 along the axial direction 'Da' from the first body 402is displaced. The pressure 'Pa' can be exerted by expanding ice that forms in the frozen state of the reagent. The spring element 406 It also deforms to accommodate the movement of the second body 404 to enable along the axial direction 'Da'. Specifically, the intermediate sections can 450 of the spring element 406 deform to change the movement of the second body 404 relative to the first body 402 to enable this. The spring element 406 However, the applied preload force 'Fs' can influence the movement of the second body. 404 limit and the second body 404 in the (in Fig. 11) distance 'D2' from the end of the rod piece 456 Hold. This can be an extended position or configuration of the second body. 404 correspond to the preload force 'Fs' exerted by the spring element. 406The force exerted due to the preload can thus counteract the pressure 'Ps' exerted by the reagent in its frozen state. The force exerted by the movement of the second body 404 formed expansion chamber 491 It can also provide space for the reagent to expand during freezing. The sealing element 487 Can the reagent leak from the injector? 400 prevent this. During subsequent thawing of the reagent, it may contract. The pressure 'Pa' may then no longer be applied to the second body. 404 exerted. The spring element 406 can the second body 404 in the direction of the first body 402 Pre-tension after the ice has thawed. Specifically, the spring element can 406 the second body 404 move and the second body 404 towards the end of the rod section 456 hold onto.

[0060] The injector400 Thus, a spring element can be 406 They feature comprehensive freeze protection, which allows for safe reagent expansion during freezing. This prevents damage to the injector. 400 This is essentially prevented by the freezing reagent. Furthermore, the sealing element can be used to prevent this. 487 Leakage of the reagent is prevented. After the reagent has thawed, the spring element moves. 406 the second body 404 furthermore, into its normal position.

[0061] The injector 400 as in Fig. 8 to Fig. Figure 11 is only an example, and alternative configurations are possible within the scope of this disclosure. For example, instead of the second body 404 the reagent outlet tube 408 in relation to the first body 402 be movable. Furthermore, a spring element (not shown) can restrict the reagent outlet tube. 408in the direction of the first body 402 Pre-tensioning. The spring element can also counteract the movement of the reagent outlet tube in response to the expansion of the reagent during freezing. 408 limit. The spring element can also limit the reagent outlet tube. 408 move into a normal position once the reagent has thawed. Thus, the present disclosure does not relate to movement in the axial direction 'Da' of the injector. 400 The movement is limited to allow expansion of the reagent in the frozen state. Instead, the movement can be oriented at any angle relative to the longitudinal axis 'L1'.

[0062] In another embodiment, both the second body 404 as well as the reagent outlet tube 408 in relation to the first body 402 be flexible. The injector 400 It can then have two spring elements. One spring element can be attached to the second body. 404are used while the other spring element is on the reagent outlet tube 408 can be used.

[0063] Fig. 12 and Fig. Figure 13 illustrates cross-sectional views of an injector. 600 according to another aspect of the present disclosure. The injector 600 It is essentially similar in structure and function to the one described above with reference to Fig. 2 to Fig. 7 described injector 110 Similar components were therefore given similar reference numerals. A spring element 602 of the injector 600 However, it can also be used as an upper cap for the first body. 202 have an effect. In particular, the spring element can 602 various parts of the valve assembly 216 within the first body 202 hold. The spring element 602 is between the first body 202 and the second body 204 positioned. The spring element 602can also the second body 204 movable with the first body 202 connect. In one embodiment, the spring element can be 602 It is a generally flat spring. Furthermore, the spring element can 602 be formed by at least one stamping or forming process. In a further embodiment, the spring element can 602 The spring element must be made of a metal or a metal alloy. 602 has at least one main section 604 , at least one intermediate section 606 , at least one elongated section 608 and at least one cap section 610 in one embodiment the spring element 602 have an essentially axisymmetrical configuration. In particular, the spring element can 602 essentially symmetrical about the longitudinal axis 'L' of the injector 600be. In alternative embodiments, the spring element can 602 a couple of intermediate sections 606 , which differ from the main section 604 extend from, and a couple of elongated sections 608 exhibiting features that differ from the respective intermediate sections. 606 extend from. In another embodiment, the spring element 602 several intermediate sections 606 exhibit, with each intermediate section 606 from a separate main section (not shown). Furthermore, each of the elongated sections can 608 from a corresponding intermediate section 606 extend from. Thus, the intermediate sections 606 and the elongated sections 608 not connected. The intermediate sections 606 and the elongated sections 608can be bent or deformed away from each other, thereby hindering the maintenance and / or replacement of one or more internal components (e.g., the valve assembly). 216 ) of the injector 600 is made possible.

[0064] The main section 604 is on the flange section 243 of the test tube 240 arranged. Furthermore, the main section 604 against the top 244 of the flange section 243 pressed. The top 244 may have a lip contour, so that the main section 604 on the second body 204 snaps or locks into place. This also allows the second body to rotate. 204 This can be prevented. In another embodiment, the main section 604 with an essentially circular area of ​​the flange section 243 of the test tube 240 be connected. The main section 604can have a ring-shaped form that has a main opening 612 defined. The main opening 612 is at least partially around the test tube 240 arranged around. In an alternative embodiment, the main section 604 It may not have a completely enclosed opening. For example, the main opening may not 612 It should be essentially U-shaped. The test tube 240 can therefore pass through the main opening 612 extend through it. In one embodiment, the main section 604 on the flange section 243 of the second body 204 be pressed on. In other embodiments, the main section can be 604 through various processes such as welding, brazing, adhesives, mechanical fasteners, etc. on the second body 204 be attached. In another embodiment, the main section 604 solvable with the second body204 be connected.

[0065] The intermediate section 606 can deviate from the main section 604 extend from. In another embodiment, the main section 604 an end or an extension of the intermediate section 606 his, that or the with the second body 204 is in contact. In an undeformed or normal state, as in Fig. 12 shown, the intermediate section 606 a curved shape that extends from the main section 604 extends upwards and then becomes an elongated section 608 curves downwards. In a deformed state or configuration, as in Fig. 13 shown, part of the intermediate section 606 essentially parallel to the main section 604 aligned. After the intermediate section 606 is deformed or bent to a point where the part of the intermediate section 606essentially parallel to the main section 604 If the spring element is aligned 602 the maximum axial movement of the second body 204 relative to the first body 202 limit. A distance 'D3' (in Fig. (13 shown) can be the maximum axial movement of the second body 204 relative to the first body 202 correspond. The distance 'D3' can be the distance between the second body. 204 and the rod piece 256 be.

[0066] The elongated section 608 extends from the intermediate section 606 out. The intermediate section 606 Thus, one can distinguish between the main section 604 and the elongated section 608 be arranged. Furthermore, the elongated section can 608 with the rod piece 256 be connected. In one embodiment, the elongated section 608 by welding to the rod piece 256connected. In other embodiments, the elongated section can 608 through various methods such as brazing, mechanical fasteners, adhesives, etc. with the rod piece 256 be connected. In another embodiment, the elongated section can be 608 with the rod piece 256 be detachably connected by any non-permanent joining method. Such a detachable connection can make it possible to separate the second body. 204 from the first body 202 to remove in order to facilitate the maintenance and / or replacement of one or more internal components (e.g., the valve assembly). 216 ) of the injector 600 to enable this. In another embodiment, the elongated section 608 with the rod piece 256 be connected by a snap connection.

[0067] The cap section 610 extends from the elongated section 608out and is essentially normal to the longitudinal axis 'L' of the injector 600 aligned. The elongated section 608 Thus, one can thus choose between the intermediate section 606 and the cap section 610 be arranged. The cap section 610 covers the upper end of the first body 202 at least partially. In one embodiment, the cap section 610 by welding with the first body 202 connected. In other embodiments, the cap section can be 610 through various processes such as brazing, mechanical fasteners, adhesives, etc. with the first body 202 be connected. In another embodiment, the cap section can be 610 with the first body 202 be detachably connected by any non-permanent joining method. Such a detachable connection can make it possible to separate the second body. 204 from the first body202 to remove in order to facilitate the maintenance and / or replacement of one or more internal components (e.g., the valve assembly). 216 ) of the injector 600 to enable this. In another embodiment, the cap section 610 with the first body 202 be connected by a snap connection.

[0068] In one embodiment, the spring element 602 pre-tensioned to form the second body 204 in the direction of the first body 202 to pre-tension. In another embodiment, the spring element 602 furthermore configured so that it is the valve assembly 216 in the direction of the first body 202 pre-tensions or presses. The second body 204 can react to the expansion of the reagent during freezing against the preload of the spring element. 602 move the spring element 602is furthermore configured to ensure maximum movement of the second body in response to the expansion of the reagent during freezing. 204 relative to the first body 202 limited. In particular, the spring element 602 A preload force 'F1' is exerted against the pressure 'P' exerted by the reagent during freezing. The reagent can expand in the frozen state due to ice formation. The expansion of the reagent is therefore caused by the expansion of ice. The pressure 'P' is exerted by ice that forms as the reagent freezes. The spring element 602 can also be configured to be the upper end of the first body 202 at least partially covers it.

[0069] The second body 204 including the test tube 240 can occur in response to an expansion of the reagent during freezing relative to the first body 202can be displaced axially. The spring element 602 can a maximum axial movement of the second body 204 limit. In a displaced state, such as in Fig. As shown in 13, the test tube 240 and the rod piece 256 an expansion chamber 614 Define between themselves. The expansion chamber 614 This allows the reagent to expand during freezing. The expansion chamber 614 It can therefore serve as a reservoir for the freezing reagent. Specifically, the expansion chamber can 614 They serve as a reservoir for ice that forms when the reagent freezes. Since the ice can expand, it can damage various components of the injector. 600 This can be prevented. Furthermore, the sealing element can 287 a leakage of the reagent from the expansion chamber 614 prevent. A volume of the expansion chamber 614It can be optimized to allow sufficient expansion of ice formed in the frozen state of the reagent.

[0070] In a normal position of the second body 204 as in Fig. The spring element is illustrated in 12. 602 so pre-tensioned that it forms the second body 204 in the direction of the first body 202 Pre-tensioned. This can correspond to an unfrozen state of the reagent. In the normal position, the flange section can 243 of the second body 204 furthermore, on one end of the rod piece 256 The reagent can expand when frozen. In the illustrated embodiment, the injector can 600 The reagent is essentially rigid in the radial direction. Consequently, it can expand along the axial direction 'D'. Furthermore, due to this expansion, the freezing reagent can exert a pressure 'P' on the second body. 204exert, thereby the second body 204 along the axial direction 'D' from the first body 202 is displaced. The pressure 'P' can be exerted by expanding ice that forms in the frozen state of the reagent. The spring element 602 It also deforms to accommodate the movement of the second body 204 to enable movement along the axial direction 'D'. In particular, the intermediate section can 606 of the spring element 602 deform to change the movement of the second body 204 relative to the first body 202 to enable this. The spring element 602 However, the applied preload force 'F1' can limit the maximum movement of the second body. 204 limit and the second body 204 in the (in Fig. 13) distance 'D3' from the end of the rod piece 256 Hold. This can be an extended position or configuration of the second body. 204correspond to the preload force 'F1', which is exerted by the spring element. 602 The force exerted due to the preload can thus counteract the pressure 'P' exerted by the reagent in its frozen state. The force exerted by the movement of the second body 204 formed expansion chamber 614 It can also provide space for the reagent to expand during freezing. The sealing element 287 Can the reagent leak from the injector? 600 prevent this. During subsequent thawing of the reagent, it may contract. The pressure 'P' may then no longer be exerted on the second body. 204 exerted. The spring element 602 can the second body 204 in the direction of the first body 202 Pre-tension after the ice has thawed. Specifically, the spring element can 602 the second body 204 move and the second body 204towards the end of the rod section 256 hold onto.

[0071] The injector 600 Thus, a spring element can be 602 They feature comprehensive freeze protection, which allows for safe reagent expansion during freezing. This prevents damage to the injector. 600 This is essentially prevented by the freezing reagent. Furthermore, the sealing element can be used to prevent this. 287 Leakage of the reagent is prevented. After the reagent has thawed, the spring element moves. 602 the second body 204 furthermore, into its normal position. The spring element 602 can also be used as an upper cap for the first body 202 works.

[0072] Fig. Figure 14 illustrates a perspective view of an injector. 800 according to another aspect of the present revelation. Fig. Figure 15 illustrates a perspective view of a cover element. 801 of the injector 800 according to one embodiment of the present disclosure. Fig. 16 and Fig. Figure 17 shows cross-sectional views of the injector. 800 The injector 800 It is essentially similar in structure and function to the one described above with reference to Fig. 2 to Fig. 7 described injector 110 Similar components were therefore given similar reference numerals. A spring element 802 of the injector 800 However, it can also be used as an upper cap for the first body. 202 serve. Furthermore, the injector has 800 the cover element 801 up, which is attached to the first body 202 is coupled. The cover element 801 features an integral flange section 803 to attach the injector 800 on a component. Furthermore, the first body defines202 a first end 805 and a second end opposite to the first end 807 Both the first and the second end 805 , 807 can be open. Furthermore, the first end can be 805 and the second end 807 with respect to the longitudinal axis 'L' of the injector 800 be spaced apart from each other. In particular, the first and second ends can be spaced apart. 805 , 807 axial ends of the injector 800 be. The first end 805 can be an upper end and is located proximal to the second body 204 The second ending 807 It can be a lower end and borders the cover element. 801 on. The first end 805 This can also include inserting and / or removing the valve assembly. 216 from the injector 800 enable. The in-depth section 230 is at the second end 807 arranged. The section of the line 226of the injector 800 can also be at the second end 807 be arranged and extend from the recessed section 230 out. The outlet opening 228 is proximal to the second end 807 of the first body 202 arranged. Furthermore, the outlet opening 228 through the section of the line 226 defined. The cover element 801 is designed so that it is the second end 807 of the injector 800 at least partially covers it.

[0073] The spring element 802 is between the first body 202 and the second body 204 positioned. The spring element 802 is designed in such a way that it allows movement of the second body 204 relative to the first body 202 This is made possible by the expansion of the reagent during freezing. The spring element 802 can the first end 805 of the injector 800at least partially cover. Furthermore, the spring element can 802 various parts of the valve assembly 216 within the first body 202 hold. The spring element 802 is between the first body 202 and the second body 204 positioned. The spring element 802 can also the second body 204 movable with the first body 202 connect. The second body 204 is therefore movable to the first body 202 coupled. In the illustrated embodiment, as shown in Fig. 16 shown, the spring element 802 a first spring part 802A and a second spring part 802B up. The first and second spring part 802A , 802B can be separate components and are independent of each other with the first body 202 and the second body 204connected. In one embodiment, the first and second spring parts are connected. 802A , 802B Each solvable with the first body 202 and the second body 204 connected. The first and second spring parts 802A , 802B can on the first and second body 202 , 204 snap together. In particular, the first and second spring parts can 802A , 802B Each should be a deformable clip, which is attached to the first body by respective snap connections. 202 and on the second body 204 are attachable. Furthermore, the first and second spring parts can be used. 802A , 802B each slightly from the injector 800 removed by removing the first and second spring parts 802A , 802B each from the longitudinal axis 'L' of the injector 800deformed. This can necessitate the maintenance and / or replacement of one or more internal components (e.g., the valve assembly). 216 ) facilitate. In one embodiment, the first and second spring parts can 802A , 802B of the spring element 802 Each can be a generally flat spring. Furthermore, the first and second spring parts can 802A , 802B Each part may be formed by at least one stamping or forming process. In a further embodiment, the first and second spring parts can be 802A , 802B be made of a metal or metal alloy. The first and second spring parts 802A , 802B each have a main section 804 , an intermediate section 806 , a first elongated section 808 , a second intermediate section 810 and a second elongated section 812 on.

[0074] The main section804 each of the first and second spring parts 802A , 802B is on the flange section 243 of the test tube 240 arranged. Furthermore, the main section 804 against the top 244 of the flange section 243 pressed. The top 244 may have a lip contour, so that the main section 804 on the second body 204 snaps or locks into place. This also allows the second body to rotate. 204 This can be prevented. In another embodiment, the main section 804 with an essentially circular area of ​​the flange section 243 of the test tube 240 be connected. In the main section 804 It could be a circular segment. The main sections 804 of the first and second spring part 802A , 802B together define a main opening 814The main opening 814 is at least partially around the test tube 240 arranged around. In one embodiment, the main section 804 It may not have a completely enclosed opening. For example, the main opening may not 814 It should be essentially U-shaped. The test tube 240 can therefore pass through the main opening 814 extend through it. In one embodiment, the main section 804 a curved end (not shown) to secure the corresponding first and second spring parts 802A , 802B on the second body 204 exhibit. Furthermore, the first and second spring parts can 802A , 802B by bending away the relevant main sections 804 from the longitudinal axis 'L' of the injector 800 from the second body 204 be removed.

[0075] The first intermediate section 806each of the first and second spring parts 802A , 802B can deviate from the main section 804 extend from. In another embodiment, the main section 804 an end or an extension of the first intermediate section 806 his, that or the with the second body 204 is in contact. In an undeformed or normal state, as in Fig. 16 shown, the first intermediate section 806 a curved shape that extends from the main section 804 extends upwards and then to the first elongated section 808 curves downwards. In a deformed state or configuration, as in Fig. 17 shown, part of the first intermediate section 806 essentially parallel to the main section 804 aligned. After the first intermediate section 806is deformed or bent to a point where the part of the first intermediate section 806 essentially parallel to the main section 804 If the spring element is aligned 802 the maximum axial movement of the second body 204 relative to the first body 202 limit. A distance 'D4' (in Fig. (17 shown) can be the maximum axial movement of the second body 204 relative to the first body 202 correspond. The distance 'D4' can be the distance between the second body. 204 and the rod piece 256 be.

[0076] The first elongated section 808 each of the first and second spring parts 802A , 802B extends from the first intermediate section 806 out. The first intermediate section 806 Thus, one can distinguish between the main section 804 and the first elongated section 808be arranged. Furthermore, the first elongated section can 808 Solvable with the rod piece 256 be connected. Such a detachable connection can make it possible to connect the second body. 204 from the first body 202 to remove in order to facilitate the maintenance and / or replacement of one or more internal components (e.g., the valve assembly). 216 ) of the injector 800 to enable this. In a further embodiment, the first elongated section can 808 with the rod piece 256 be connected by a snap connection. Furthermore, the first elongated section can 808 from the rod piece 256 bent away or deformed to allow maintenance of one or more core components of the injector 800 to enable.

[0077] The second intermediate section 810 each of the first and second spring parts 802A , 802Bextends from the first elongated section 808 out. The first intermediate section 806 can therefore be located at one end of the first elongated section 808 be arranged while the second intermediate section 810 at the opposite end of the first elongated section 808 It can be arranged. In particular, the first elongated section can 808 between the first and second intermediate section 806 , 810 be arranged. The second intermediate sections 810 of the first and second spring part 802A , 802B can be used together as an upper cap for the first body 202 have an effect. In particular, the second intermediate sections cover 810 at least partially the first end 805 of the first body 202 off. The second intermediate section 810 Thus, a cap section of each of the first and second spring parts can be removed. 802A , 802Bbe. The second intermediate section 810 can have a curved shape that extends from the first elongated section 808 extends downwards and then essentially perpendicular to the longitudinal axis 'L' of the injector 800 is aligned. The second intermediate section 810 It can also be curved to fit the second elongated section. 812 to meet. The first end 805 of the first body 202 It can be rounded or chamfered to match the curved shape of the second intermediate sections. 810 of the first and second spring part 802A , 802B to comply. The second intermediate section 810 can be solved with the first body 202 be connected. Such a detachable connection can make it possible to connect the second body. 204 from the first body 202 to remove in order to facilitate the maintenance and / or replacement of one or more internal components (e.g., the valve assembly). 216) of the injector 800 to enable this. In another embodiment, the second intermediate section can 810 with the first body 202 be connected by a snap connection. Furthermore, the second intermediate section can 810 from the first body 202 bent away or deformed to allow maintenance of one or more core components of the injector 800 to enable.

[0078] The second elongated section 812 each of the first and second spring parts 802A , 802B extends from the second intermediate section 810 out. Furthermore, the second elongated section can 812 solvable with the first body 202 be connected. Such a detachable connection can make it possible to separate the second elongated section. 812 from the first body 202to remove in order to facilitate the maintenance and / or replacement of one or more internal components (e.g., the valve assembly). 216 ) of the injector 800 to enable this. In a further embodiment, the second elongated section can 812 with the first body 202 be connected by a snap connection. Furthermore, the second elongated section can 812 from the first body 202 bent away or deformed to allow maintenance of one or more core components of the injector 800 to enable this. In one embodiment, the second elongated section can 812 having a curved end (not shown) that forms a lip (not shown) of the first body 202 intervenes to engage the corresponding first and second spring part 802A , 802B on the first body 202 to secure.

[0079] The cover element 801 has a shell section 818and the flange section 803 on, which is connected to the shell section 818 is integrally formed. The flange section 803 can detach from the shell section 818 extend outwards. The shell section 818 is designed so that it has the second end 807 of the first body 202 at least partially covers the shell section. 818 can have an essentially axisymmetric configuration. In particular, the shell section can 818 essentially symmetrical about the longitudinal axis 'L' of the injector 800 be. Furthermore, the shell section defines 818 of the cover element 801 a cover opening running through it 820 The cover opening 820 can be placed in the middle of the shell section 818 be positioned. The cover opening 820 is designed to cover the line section 226 of the injector 800at least partially absorbs. In particular, the cover opening can 820 an end 822 of the line section 226 record. The section of the line 226 can also be attached to the end 822 have an adjacent step, so that the pipe section 226 on the shell section 818 can be supported. In the illustrated embodiment, the cover opening 820 Essentially circular. The cover opening 820 However, it can take any suitable form to accommodate the pipe section. 226 at least partially to be incorporated therein. In one embodiment, the shell section can 818 on the section of the line 226 be pressed on. In particular, an inner diameter of the shell section may be required. 818 , which opens the cover 820 defined, towards the end 822 of the line section 226 be pressed on. Between the shell section818 and an outer diameter of the second end 807 of the first body 202 A clearance fit may be provided. In another embodiment, the shell section 818 furthermore, at one or more weld points or points with the pipe section 226 be welded. In particular, the shell section may be welded. 818 at a first welding point 826 with the line section 226 be welded. In other embodiments, the shell section can be 818 through various other methods such as brazing, mechanical fasteners, adhesives, etc. with the first body 202 be connected. The shell section 818 can be used as a bottom cap or connection cover for the injector. 800 have an effect. Furthermore, the first body 202 and the shell section 818 together a fluid chamber 824 define. The fluid chamber824 can the line section 226 at least partially surrounded. In particular, the shell section can 818 , the in-depth section 230 and the section of the line 226 the fluid chamber 824 Define the fluid inlet and outlet pipes 212, 214 of the injector. 800 can be used with the fluid chamber 824 in fluid contact. In particular, the fluid inlet 236 (in Fig. 3 shown) of the fluid inlet pipe 212 in fluid connection with the fluid chamber 824 arranged. Similarly, the fluid outlet is 238 (in Fig. 3 shown) of the fluid outlet pipe 214 in fluid connection with the fluid chamber 824 arranged. The fluid inlet 236 It can be configured to receive a fluid that is different from the reagent. In one embodiment, the fluid can be a coolant (e.g., water). The fluid inlet 236Can the fluid from the cooling system 130 (in Fig. (shown in 1) via the fluid supply line 132 absorb. The fluid passage 239 (in Fig. 5 shown) of the fluid inlet pipe 212 can be done with the angled drill hole 245 (in Fig. 5 shown) of the first body 202 in fluid contact. The angled bore 245 can be used with the fluid chamber 824 in fluid contact. Furthermore, the fluid can be in the fluid chamber. 824 the injector 800 through the fluid outlet pipe 214 exit. A flow path (not shown) of the fluid outlet pipe. 214 can be combined with another angled bore (not shown) of the first body 202 in fluid contact. This angled bore can be connected to the fluid chamber. 824 are in fluid contact. The fluid chamber 824 can be used as a cooling chamber for one or more components of the injector 800act. The cooling function of the fluid chamber 824 can essentially be the cooling function of the fluid chamber 232 (in Fig. 5 shown) of the injector 110 resemble.

[0080] The flange section 803 can be used with the shell section 818 of the cover element 801 be integrally formed. Thus, the cover element can 801 both a connection cover and a mounting flange or mounting bracket for the injector 800 in a one-piece construction. The cover element 801 It can be manufactured by stamping or investment casting. Furthermore, the cover element can... 801 be made of a metal or metal alloy. The flange section 803 can be a complex thin-walled mounting plate that extends from an outer part of the shell section 818 extends from the flange section 803further defines at least one mounting opening or mounting hole 828 In the illustrated embodiment from Fig. The flange section has 15 803 three mounting holes 828 open each of the mounting holes 828 It has a circular shape. However, each of the mounting holes can be used. 828 Depending on the requirements, they can have any other shape. The mounting holes 828 can enable the flange section 803 and thus the injector 800 to attach it to a component using mechanical fasteners such as screws. The component could be the exhaust pipe. 106 (in Fig. 1 shown) of the exhaust system 100 act. In one embodiment, the flange section 803 at one or more weld points or points with the first body 202 be welded. In particular, the flange section may be welded. 803at a second welding point 830 with an extended section 823 of the first body 202 be welded. In other embodiments, the flange section can be 803 through various other methods such as brazing, mechanical fasteners, adhesives, etc. with the first body 202 be connected.

[0081] Since the shell section 818 and the flange section 803 are integrally formed, the cover element can 801 Eliminating at least one welded joint reduces assembly cycle time and associated costs. The cover element 801 It can also cause potential alignment problems (e.g., radial play) between the shell section 818 and the first body 202 eliminate any imperfections that could otherwise interfere with the welding process. The cover element 801It can also offer an additional thermal advantage by integrating the flange section 803 It cools directly. The cover element 801 This can also reduce costs, as the connection cover and mounting flange are manufactured as an integral unit and not as separate components. Even if the cover element 801 with reference to the injector 800 As described, it is conceivable that the cover element 801 into the injectors described above 110 , 400 , 600 to integrate.

[0082] In one embodiment, the first and second spring parts 802A , 802B of the spring element 802 each pre-tensioned so that they form the second body 204 in the direction of the first body 202 pre-tension. In another embodiment, the first and second spring parts 802A , 802B of the spring element 802furthermore configured so that they can be used for the valve assembly 216 in the direction of the first body 202 pre-tension or press. The second body 204 can react to the expansion of the reagent during freezing against the preload of the first and second spring parts. 802A , 802B move. The first and second spring part 802A , 802B are furthermore configured to ensure maximum movement of the second body in response to the expansion of the reagent during freezing 204 relative to the first body 202 limit. In particular, the first and second spring parts can 802A , 802Bexert a preload force 'F2' against the pressure 'P' exerted by the reagent during freezing. The reagent can expand in the frozen state due to ice formation. The expansion of the reagent is therefore caused by the expansion of ice. The pressure 'P' is exerted by ice that forms as the reagent freezes. The first and second spring parts 802A , 802B can also be configured to be the first end 805 of the first body 202 at least partially cover.

[0083] The second body 204 including the test tube 240 can occur in response to an expansion of the reagent during freezing relative to the first body 202 They can be displaced axially. The first and second spring parts 802A , 802B can achieve a maximum axial movement of the second body 204 limit. In a displaced state, as in Fig. 17 shown, the test tube 240 and the rod piece 256 an expansion chamber 832 Define between themselves. The expansion chamber 832 This allows the reagent to expand during freezing. The expansion chamber 832 It can therefore serve as a reservoir for the freezing reagent. Specifically, the expansion chamber can 832 They serve as a reservoir for ice that forms when the reagent freezes. Since the ice can expand, it can damage various components of the injector. 800 This can be prevented. Furthermore, the sealing element can 287 a leakage of the reagent from the expansion chamber 832 prevent. A volume of the expansion chamber 832 It can be optimized to allow sufficient expansion of ice formed in the frozen state of the reagent.

[0084] In a normal position of the second body 204 are, as in Fig. 16 illustrates the first and second part of the spring 802A , 802B so pre-tensioned that they form the second body 204 in the direction of the first body 202 Pre-tension. This can correspond to an unfrozen state of the reagent. In the normal position, the flange section can 243 of the second body 204 furthermore, on one end of the rod piece 256 The reagent can expand when frozen. In the illustrated embodiment, the injector can 800 The reagent is essentially rigid in the radial direction. Consequently, it can expand along the axial direction 'D'. Furthermore, due to this expansion, the freezing reagent can exert a pressure 'P' on the second body. 204 exert, thereby the second body 204 along the axial direction 'D' from the first body 202is displaced. The pressure 'P' can be exerted by expanding ice that forms in the frozen state of the reagent. The first and second spring parts 802A , 802B They each also deform to accommodate the movement of the second body 204 to enable along the axial direction 'D'. In particular, the first intermediate section can 806 each of the first and second spring parts 802A , 802B deform to change the movement of the second body 204 relative to the first body 202 to enable. The first and second spring parts 802A , 802B However, the applied preload force 'F2' can limit the maximum movement of the second body. 204 limit and the second body 204 in the (in Fig. 17 shown) distance 'D4' from the end of the rod piece 256 Hold. This can be an extended position or configuration of the second body. 204correspond to the preload force 'F2', which is determined by the first and second spring parts. 802A , 802B The force exerted due to the preload can thus counteract the pressure 'P' exerted by the reagent in its frozen state. The force exerted by the movement of the second body 204 formed expansion chamber 832 It can also provide space for the reagent to expand during freezing. The sealing element 287 Can the reagent leak from the injector? 800 prevent this. During subsequent thawing of the reagent, it may contract. The pressure 'P' may then no longer be exerted on the second body. 204 exercised. The first and second spring part 802A , 802B can the second body 204 in the direction of the first body 202 Pre-tension after the ice has thawed. In particular, the first and second spring sections can be used. 802A , 802Bthe second body 204 move and the second body 204 towards the end of the rod section 256 hold onto.

[0085] The injector 800 Thus, a spring element can be 802 They feature comprehensive freeze protection, which allows for safe reagent expansion during freezing. This prevents damage to the injector. 800 This is essentially prevented by the freezing reagent. Furthermore, the sealing element can be used to prevent this. 287 Leakage of the reagent must be prevented. After the reagent has thawed, the first and second spring parts move. 802A , 802B of the spring element 802 the second body 204 furthermore, into its normal position. The first and second spring parts 802A , 802B can also be used as an upper cap for the first body 202 have an effect. In particular, the second intermediate sections can 810of the first and second spring part 802A , 802B the first end 805 of the first body 202 at least partially cover. The second intermediate sections 810 This means that at least one core or internal component (for example, the valve assembly) can be affected. 216 ) of the injector 800 within the first body 202 Hold on. The second intermediate sections 810 can also be from the first body 202 be bent away to allow maintenance on one or more core components of the injector. 800 to enable this. In particular, the second intermediate sections can 810 to enable one or more components of the valve assembly 216 from the first body 202 to be taken.

[0086] Fig. Figure 18 illustrates a perspective view of an injector. 900 according to another aspect of the present disclosure. The injector 900It is essentially similar in structure and function to the one described above with reference to Fig. 8 to Fig. 11 described injector 400 Similar components were therefore given similar reference numerals. A spring element 902 of the injector 600 However, there is a gap between the reagent outlet tube. 408 and the first body 402 arranged. The reagent outlet tube 408 defines a pipe axis 'T' which is oriented at an angle 'Ai' relative to the longitudinal axis 'L1' of the injector. 900 is inclined. Furthermore, instead of the second body, 404 the reagent outlet tube 408 in relation to the first body 402 movable. In particular, the reagent outlet tube. 408 along an inclined direction 'Di', which runs essentially parallel to the tube axis 'T'. Thus, the movement of the reagent outlet tube 408 inclined at the angle 'Ai' with respect to the longitudinal axis 'L1'. The spring element902 connects the reagent outlet tube 408 movable with the first body 402 Furthermore, the spring element 902 pre-tensioned to secure the reagent outlet tube 408 in the direction of the first body 402 to pre-tension. The spring element 902 Furthermore, the movement of the reagent outlet tube in response to the expansion of the reagent during freezing can be observed. 408 limit the spring element 902 Furthermore, the reagent outlet tube 408 into a normal position (as in Fig. (shown in Figure 18) move the reagent when it has thawed.

[0087] In one embodiment, the spring element can be 902 It is essentially a flat spring. Furthermore, the spring element can 902 be formed by at least one stamping or forming process. In a further embodiment, the spring element can 902The spring element must be made of a metal or a metal alloy. 902 has a main section 904 , a pair of elongated sections 906 (only one in Fig. 18 shown) and a couple of intermediate sections 908 (only one in Fig. 18 shown) on, which between the main section 904 and the corresponding elongated sections 906 are arranged.

[0088] The main section 904 is on the flange section 910 of the reagent outlet tube 408 arranged. Furthermore, the main section 904 against the top 911 (in Fig. 8 shown) of the flange section 910 pressed. The main section 904 can have a ring-shaped form that has a main opening 912 defined. Even if, in the illustrated embodiment, the main opening 912which has an essentially circular shape, other shapes of the main opening are possible 912 to be considered within the scope of the present disclosure. Such forms of main opening 912 They can be polygonal, elliptical, etc. The main opening 912 is at least partially around the reagent outlet tube 408 arranged around it. The reagent outlet tube 408 can therefore pass through the main opening 912 extend through it. In one embodiment, the main section 904 on the flange section 910 of the reagent outlet tube 408 be pressed on. In other embodiments, the main section can be 904 by various processes such as welding, brazing, adhesives, mechanical fasteners, etc. on the reagent outlet tube 408 be attached. In another embodiment, the main section 904 solvable with the reagent outlet tube 408be connected.

[0089] The intermediate sections 908 can originate from diametrically opposed sides of the main section 904 extend from. In an undeformed or normal state, as in Fig. 18 shown, the intermediate sections 908 Each a curved shape that extends from the main section 904 extends upwards and then to the respective elongated section 906 curves downwards. Each intermediate section 908 It is designed to deform in order to prevent movement of the reagent outlet tube. 408 relative to the first body 402 to enable this. In particular, each intermediate section deforms. 908 , to prevent movement of the reagent outlet tube 408 away from the first body 402 to enable movement along the inclined direction 'Di'. In a deformed state, the spring element can 902 the maximum movement of the reagent outlet tube408 relative to the first body 402 limit.

[0090] Each elongated section 906 It has an essentially planar shape. In the illustrated embodiment, each elongated section 906 with the recording section 434 of the first body 402 connected. In one embodiment, each elongated section is 906 by welding with the first body 402 connected. In other embodiments, each elongated section can 906 through various processes such as brazing, mechanical fasteners, adhesives, etc. with the first body 402 be connected. In another embodiment, each elongated section can be 906 with the first body 402 It must be detachably connected by any non-permanent joining method. Such a detachable connection can allow the reagent outlet tube to be removed. 408 from the first body402 to remove in order to facilitate the maintenance and / or replacement of one or more internal components of the injector. 900 to enable this. In another embodiment, each elongated section can 906 with the first body 402 be connected by a snap connection.

[0091] In one embodiment, the spring element 902 pre-tensioned to secure the reagent outlet tube 408 in the direction of the first body 402 to pre-tension the reagent outlet tube. 408 can react to the expansion of the reagent during freezing against the preload of the spring element. 902 move the spring element 902 is furthermore configured to ensure maximum movement of the reagent outlet tube in response to the expansion of the reagent during freezing. 408 relative to the first body 402 limited.

[0092] In one embodiment, a sealing element (not shown) can be placed between the reagent outlet tube. 408 and the first body 402 The sealing element can be an O-ring. The sealing element can prevent reagent from leaking out of the injector. 900 during a movement of the reagent outlet tube 408 impede.

[0093] In a normal position of the reagent outlet tube 408 is as in Fig. 18 illustrates the spring element 902 so pre-tensioned that it restricts the reagent outlet tube 408 in the direction of the first body 402 Pre-stressed. This can correspond to an unfrozen state of the reagent. The reagent can expand when frozen. Due to this expansion, the freezing reagent can exert pressure on the reagent outlet tube. 408 exert pressure, thereby affecting the reagent outlet tube 408 along the inclined direction 'Di' from the first body 402is moved away. The spring element 902 It also deforms to accommodate the movement of the reagent outlet tube. 408 to enable along the inclined direction 'Di'. In particular, the intermediate sections can 908 of the spring element 902 deform to control the movement of the reagent outlet tube 408 relative to the first body 402 to enable. A through the spring element 902 However, the applied preload force can restrict the movement of the reagent outlet tube. 408 limit and the reagent outlet tube 408 at a predetermined distance relative to the first body 402 hold. The preload force exerted by the spring element 902 The pressure exerted by the preload can thus counteract the pressure exerted by the reagent in its frozen state. This is achieved through the movement of the reagent outlet tube. 408 formed expansion chamber 291(Not shown) can also provide space for the reagent to expand during freezing. The sealing element can prevent reagent from leaking out of the injector. 900 Prevent this. If the reagent subsequently thaws, it may contract. The pressure may then no longer be applied to the reagent outlet tube. 408 exerted. The spring element 902 can the reagent outlet tube 408 in the direction of the first body 402 pre-tension after the ice has thawed.

[0094] The injector 900 Thus, a spring element can be 902 They feature comprehensive freeze protection, which allows for safe reagent expansion during freezing. This prevents damage to the injector. 900This is essentially prevented by the freezing reagent. Furthermore, the sealing element prevents the reagent from leaking out. Once the reagent has thawed, the spring element moves. 902 the reagent outlet tube 408 furthermore, into its normal position.

[0095] Although aspects of the present disclosure have been specifically shown and described with reference to the embodiments described above, it is obvious to the person skilled in the art that various additional embodiments can be considered by modifying the disclosed machines, systems, and methods without deviating from the concept and scope of protection of the disclosed invention. Such embodiments are considered to fall within the scope of protection of the present disclosure, which is determined based on the claims and any equivalents thereof. QUOTES INCLUDED IN THE DESCRIPTION

[0000] This list of documents cited by the applicant was automatically generated and is included solely for the reader's convenience. The list is not part of the German patent or utility model application. The DPMA accepts no liability for any errors or omissions. Cited patent literature

[0000] US 16044980

[0001] US 2014054394 A1

[0005]

Claims

[1] Injector (110, 400, 600, 800, 900) for injecting a reagent, wherein the injector (110, 400, 600, 800, 900) has the following: a first injector body (202, 402) defining a first end (805) and a second end (807), wherein the first injector body (202, 402) further comprises an outlet opening (228, 428) arranged proximal to the second end (807), a valve assembly (216, 412) which is at least partially enclosed by the first injector body (202, 402), wherein the valve assembly (216, 412) is configured to selectively release the reagent through the outlet port (228, 428) of the first injector body (202, 402), and a cover element (801) coupled to the first injector body (202, 402) and designed to at least partially cover the second end (807) of the first injector body (202, 402), wherein the cover element (801) has an integral flange section (803) for attaching the injector (110, 400, 600, 800, 900) to a component. [2] Injector (110, 400, 600, 800, 900) according to claim 1, wherein the cover element (801) further comprises a shell section (818) and wherein the shell section (818) and the first injector body (202, 402) further define a fluid chamber (232, 824). [3] Injector (110, 400, 600, 800, 900) according to claim 2, further comprising: a fluid inlet (236) in fluid connection with the fluid chamber (232, 824) and a fluid outlet (238) in fluid connection with the fluid chamber (232, 824). [4] Injector (110, 400, 600, 800, 900) according to claim 3, wherein the fluid inlet (236) is configured to receive a fluid that is different from the reagent. [5] Injector (110, 400, 600, 800, 900) according to claim 2, wherein the first injector body (202, 402) further comprises a conduit section (226) defining the outlet opening (228, 428), and wherein the shell section (818) of the cover element (801) further defines a cover opening (820) designed to at least partially accommodate the conduit section (226). [6] Injector (110, 400, 600, 800, 900) according to claim 1, wherein the flange section (803) of the cover element (801) further defines at least one mounting hole (828). [7] Injector (110, 400, 600, 800, 900) according to claim 1, which further comprises a second injector body (204) coupled to the first injector body (202, 402), wherein the second injector body (204) comprises a reagent tube (240). [8] Injector (110, 400, 600, 800, 900) according to claim 7, further comprising a spring element (206, 406, 602, 802) positioned between the first injector body (202, 402) and the second injector body (204), wherein the spring element (206, 406, 602, 802) is designed to allow movement of the second injector body (204) relative to the first injector body (202, 402) in response to expansion of the reagent during freezing. [9] Injector (110, 400, 600, 800, 900) for injecting a reagent, wherein the injector (110, 400, 600, 800, 900) has the following: a first injector body (202, 402) defining a first end (805) and a second end (807), wherein the first injector body (202) further comprises an outlet opening (228, 428) arranged proximal to the second end (807), a second injector body (204) coupled to the first injector body (202, 402), wherein the second injector body (202) has a test tube (240), a valve assembly (216, 412) which is at least partially enclosed by the first injector body (202, 402), wherein the valve assembly (216, 412) is configured to selectively release the reagent through the outlet port (228, 428) of the first injector body (202, 402), and a cover element (801) coupled to the first injector body (202, 402) and designed to at least partially cover the second end (807) of the first injector body (202, 402), wherein the cover element (801) has an integral flange section (803) for attaching the injector (110, 400, 600, 800, 900) to a component. [10] Injector (110, 400, 600, 800, 900) according to claim 9, wherein the cover element (801) further comprises a shell section (818) and wherein the shell section (818) and the first injector body (202, 402) further define a fluid chamber (232, 824). [11] Injector (110, 400, 600, 800, 900) according to claim 10, further comprising: a fluid inlet (236) in fluid connection with the fluid chamber (232, 824) and a fluid outlet (238) in fluid connection with the fluid chamber (232, 824). [12] Injector (110, 400, 600, 800, 900) according to claim 11, wherein the fluid inlet (236) is configured to receive a fluid that is different from the reagent. [13] Injector (110, 400, 600, 800, 900) according to claim 10, wherein the first injector body (202, 402) further comprises a conduit section (226) defining the outlet opening (228, 428), and wherein the shell section (818) of the cover element (801) further defines a cover opening (820) designed to at least partially accommodate the conduit section (226). [14] Injector (110, 400, 600, 800, 900) according to claim 9, wherein the flange section (803) of the cover element (801) further defines at least one mounting hole (828). [15] Injector (110, 400, 600, 800, 900) according to claim 9, further comprising a spring element (206, 406, 602, 802) positioned between the first injector body (202, 402) and the second injector body (204), wherein the spring element (206, 406, 602, 802) is designed to allow movement of the second injector body (204) relative to the first injector body (202, 402) in response to expansion of the reagent during freezing. [16] Injector (110, 400, 600, 800, 900) for injecting a reagent, wherein the injector (110, 400, 600, 800, 900) has the following: a first injector body (202, 402) defining a first end (805) and a second end (807), wherein the first injector body (202) further comprises an outlet opening (228, 428) arranged proximal to the second end (807), a second injector body (204) coupled to the first injector body (202, 402), wherein the second injector body (204) has a test tube (240), a valve assembly (216, 412) which is at least partially enclosed by the first injector body (202, 402), wherein the valve assembly (216, 412) is configured to selectively release the reagent through the outlet port (228, 428) of the first injector body (202, 402), and a cover element (801) coupled to the first injector body (202, 402), wherein the cover element (801) has the following: a shell section (818) designed to at least partially cover the second end (807) of the first injector body (202, 402), wherein the shell section (818) and the first injector body (202, 402) define a fluid chamber (232, 824), and a flange section (803) for attaching the injector (110, 400, 600, 800, 900) to a component, wherein the flange section (803) is integrally formed with the shell section (818). [17] Injector (110, 400, 600, 800, 900) according to claim 16, further comprising: a fluid inlet (236) in fluid connection with the fluid chamber (232, 824) and a fluid outlet (238) in fluid connection with the fluid chamber (232, 824). [18] Injector (110, 400, 600, 800, 900) according to claim 17, wherein the fluid inlet (236) is configured to receive a fluid that is different from the reagent. [19] Injector (110, 400, 600, 800, 900) according to claim 16, wherein the first injector body (202, 402) further comprises a conduit section (226) defining the outlet opening (228, 428), and wherein the shell section (818) of the cover element (801) further defines a cover opening (820) designed to at least partially accommodate the conduit section (226). [20] Injector (110, 400, 600, 800, 900) according to claim 16, further comprising a spring element (206, 406, 602, 802) positioned between the first injector body (202, 402) and the second injector body (204), wherein the spring element (206, 406, 602, 802) is designed to allow movement of the second injector body (202, 402) relative to the first injector body (204) in response to expansion of the reagent during freezing.