injection valve

Abstract

The utility model relates to a kind of injection valves, comprising: valve pipe fittings, it forms the valve passage that axially penetrates valve pipe fittings;Valve seat, it forms the valve seat passage that axially penetrates valve seat, valve seat sealingly engages to the one axial end of valve pipe fittings, so that valve seat passage is fluidly communicated with valve passage;Orifice plate, it includes at least one spray hole and the peripheral region around the at least one spray hole;And engagement pipe fittings, it is connected to orifice plate and detachably sealingly engaged to the one axial end of valve pipe fittings, so that the peripheral region of orifice plate contacts valve seat and the at least one spray hole is fluidly communicated with valve seat passage.In the injection valve provided in the utility model, engagement pipe fittings and orifice plate connected to engagement pipe fittings can be replaced with low maintenance cost and high efficiency.

Description

Technical Field

[0001] This utility model relates to the field of valve technology, specifically to a jet valve. Background Technology

[0002] Injection valves are widely used. For example, when an injection valve is used in a fuel injection system, the fluid to be injected by the injection valve can be fuel. As another example, when an injection valve is used in a selective catalytic reduction (SCR) urea injection system, the fluid to be injected by the injection valve can be a urea solution.

[0003] Taking the injection valve used in an SCR urea injection system as an example, insufficient urea solution injection or cessation of injection due to clogging of the orifice plate of the injection valve is a very frequent failure mode of the injection valve. The main reasons include: high-temperature crystallization of residual urea solution. Specifically, urea solution undergoes a pyrolysis reaction at high temperatures, decomposing into ammonia and ammonium hydrogen cyanide gas. These gases recrystallize at high temperatures to form solid particles. In addition, colloidal substances such as biuret and triuret in urea are also prone to crystallization at sustained high temperatures, adhering to the orifice plate and causing blockage; the orifice plate made of 304 stainless steel plate corrodes and rusts; and the injection valve is installed in the exhaust pipe, and the backflow that may occur after the injection valve finishes may cause particulate matter and impurities in the exhaust pipe to enter and block the orifice plate.

[0004] Currently, the injection valve integrates the orifice plate with other components, meaning that if the injection valve fails due to blockage of the orifice plate's nozzles, the entire valve must be replaced, resulting in high maintenance costs. Utility Model Content

[0005] One object of this invention is to provide an injection valve that overcomes the aforementioned defects.

[0006] According to one aspect of the present invention, a jet valve is provided, comprising: a valve fitting forming a valve passage axially extending through the valve fitting; a valve seat forming a valve seat passage axially extending through the valve seat, the valve seat being sealed to an axial end of the valve fitting such that the valve seat passage is in fluid communication with the valve passage; an orifice plate including at least one nozzle and a peripheral region surrounding the at least one nozzle; and a connecting fitting connected to the orifice plate and removably sealed to the axial end of the valve fitting such that the peripheral region of the orifice plate contacts the valve seat and the at least one nozzle is in fluid communication with the valve seat passage.

[0007] Optionally, the valve seat is inserted into one axial end of the valve fitting, and a portion of the valve seat extends from the one axial end of the valve fitting to contact the peripheral area of ​​the orifice plate.

[0008] Optionally, the connecting pipe fitting is detachably and sealingly connected around one axial end of the valve fitting via a threaded connection coated with thread-locking adhesive; or the connecting pipe fitting is detachably and sealingly connected around one axial end of the valve fitting via a threaded connection and an elastic seal disposed between the connecting pipe fitting and the one axial end of the valve fitting.

[0009] Optionally, the fitting includes a main pipe section and a support ring connected to the main pipe section, the support ring protruding radially inward relative to the main pipe section to form a radial engagement surface close to the main pipe section, and the peripheral area of ​​the orifice plate being welded to the radial engagement surface of the support ring.

[0010] Optionally, the fitting includes a main pipe section and a support ring connected to the main pipe section, the support ring protruding radially inward relative to the main pipe section to form a radial engagement surface close to the main pipe section, and the peripheral area of ​​the orifice plate is sealed to the radial engagement surface of the support ring by a sealant.

[0011] Optionally, the support ring may also include a sealant groove recessed relative to the radial engagement surface for receiving sealant.

[0012] Alternatively, the peripheral area of ​​the orifice plate may be welded to one end face of the connecting pipe fitting, or the orifice plate may be integrally formed into the connecting pipe fitting.

[0013] Optionally, the valve seat includes a main segment and an engagement ring connected to the main segment. A portion of the main segment adjacent to the engagement ring forms a radially narrowed section of the valve seat passage for closure by a ball valve of the injection valve. The engagement ring extends axially downward relative to the main segment to form a radially widened section of the valve seat passage for alignment with the at least one nozzle of the orifice plate.

[0014] Optionally, the injection valve further includes: a ball valve disposed within a valve seat passage; and a valve stem disposed within a valve passage, one axial end of the valve stem being fixed to the ball valve, wherein the valve stem is formed by rolling a sheet metal plate to form a valve stem passage and a slot axially penetrating the valve stem, the slot being in fluid communication with the valve stem passage.

[0015] Optionally, the injection valve further includes: a support sleeve fixed within a valve passage; and an armature ring movably inserted into the support sleeve, the other axial end of the valve stem being fixed to the armature ring, the armature ring including a clamping protrusion extending axially downward from one axial end of the armature ring and extending from the support sleeve passage to clamp the other axial end of the valve stem, thereby facilitating the sealing connection of the clamping protrusion and the armature ring to the valve stem by welding.

[0016] In the injection valve provided by this utility model, since the connecting pipe is detachably and sealingly connected to one axial end of the valve pipe, when the fluid injection volume is insufficient or even stops due to blockage of at least one nozzle of the orifice plate for various reasons, the connecting pipe and the orifice plate connected to the connecting pipe can be replaced with low maintenance cost and high efficiency.

[0017] Other features and advantages of the present invention will become clear from the following detailed description of exemplary embodiments of the present invention with reference to the accompanying drawings. Attached Figure Description

[0018] The accompanying drawings, which form part of this specification, illustrate embodiments of the present invention and, together with the specification, serve to explain the principles of the present invention.

[0019] Figure 1 This is a longitudinal sectional view of an injection valve according to one embodiment of the present invention, wherein the upper right portion of the injection valve, divided by dashed lines, is shown simplified in an external view.

[0020] Figure 2 yes Figure 1 A longitudinal sectional view of the lower axial end of the injection valve, wherein the orifice plate assembly of the injection valve has been removed.

[0021] Figure 3 yes Figure 1 A longitudinal sectional view of the orifice plate assembly of the injection valve.

[0022] Figure 4 This is a longitudinal sectional view of the lower axial end of the injection valve according to another embodiment of the present invention.

[0023] Figure 5 This is a longitudinal sectional view of the orifice plate assembly of the injection valve according to yet another embodiment of the present invention.

[0024] Figure 6 This is a longitudinal sectional view of the lower axial end of the injection valve according to yet another embodiment of the present invention.

[0025] Figure 7 This is a longitudinal sectional view of the lower axial end of the injection valve according to yet another embodiment of the present invention. Detailed Implementation

[0026] In this document, common techniques and structures of injection valves known to those skilled in the art may not be discussed in detail, but where appropriate, these techniques and structures should be considered part of the instruction manual.

[0027] For ease of description, based on the flow direction of the fluid to be ejected by the ejector valve (e.g., Figure 1Arrow A indicates the direction of flow of the fluid ejected by the injection valve. "Up" indicates the direction of flow of the fluid ejected by the injection valve. "Down" indicates the direction of flow of the fluid ejected by the injection valve. "Inner" and "outer" are defined based on the axis of the injection valve. "Inner" indicates the direction radially closer to the axis of the injection valve. "Outer" indicates the direction radially away from the axis of the injection valve. The axis of the injection valve is substantially coincident with or substantially consistent with the axes of the various components constituting the injection valve, which will be described below.

[0028] In this document, the term "detachable" means that the two parts can be separated from each other without using tools and / or without damaging the respective structure and mating surfaces of the two interlocking parts.

[0029] In this article, the term "connected" to component B may mean that component A and component B are formed as a single unit, or it may mean that component A and component B are formed separately but joined together by various suitable means.

[0030] refer to Figure 1 The injection valve 10 includes an upper valve fitting 12 (also referred to as a valve body) and a lower valve fitting 14. The upper valve fitting 12 forms an upper valve passage axially extending through the upper valve fitting 12. The lower valve fitting 14 forms a lower valve passage axially extending through the lower valve fitting 14. The upper valve fitting 12 can be sealingly engaged with the lower valve fitting 14 so that the upper valve passage is in fluid communication with the lower valve passage. Generally, the upper valve fitting 12 can be made of plastic, while the lower valve fitting 14 can be made of metal. After the relevant components of the injection valve (described below) are placed in the lower valve passage, the upper valve fitting 12 can be overmolded onto the upper axial end 14a of the lower valve fitting 14. For example, the outer peripheral wall of the upper axial end 14a of the lower valve fitting 14 includes a serrated section 16. The plastic used to manufacture the upper valve fitting 12 can flow in liquid form into the serrated section 16 during the overmolding process to achieve a sealed connection between the upper valve fitting 12 and the lower valve fitting 14 after the plastic used to manufacture the upper valve fitting 12 has cured and to prevent the upper valve fitting 12 from detaching from the lower valve fitting 14.

[0031] Specifically, the lower valve fitting 14 may include: a first pipe region 20, the first pipe region 20 including the upper axial end 14a of the lower valve fitting 14, and the first pipe region 20 forming a first section of the lower valve passage; a second pipe region 22 connected from below the first pipe region 20 to the first pipe region 20, the second pipe region 22 including the lower axial end 14b of the lower valve fitting 14, and the second pipe region 22 forming a second section 24 of the lower valve passage, the diameter of the first section of the lower valve passage being larger than the diameter of the second section 24 of the lower valve passage; and a transition pipe region 26 located between the first pipe region 20 and the second pipe region 22, the transition pipe region 26 forming an upper radial support surface located within the first section of the lower valve passage.

[0032] The injection valve 10 may further include an electromagnetic device and a support sleeve 28. The electromagnetic device includes an electromagnetic coil 30 and a coil housing 32 that seals the electromagnetic coil 30. The coil housing 32 forms a coil housing channel axially extending through the coil housing 32, and the support sleeve 28 extends through the coil housing channel. The outer peripheral surface of the coil housing 32 may at least partially contact the inner peripheral wall of the first pipe region 20 and / or the inner peripheral surface of the coil housing 32 may at least partially contact the outer peripheral wall of the support sleeve 28. The coil housing 32 may also include a protrusion 34 extending downward relative to the lower end surface of the coil housing 32, the protrusion 34 contacting the upper radial support surface of the transition pipe region 26. Moreover, the lower axial end 12a of the upper valve fitting 12 may also include a lower radial support surface 18, and when the upper valve fitting 12 is sealed to the lower valve fitting 14, the upper end surface of the coil housing 32 may contact the lower radial support surface 18 on the lower axial end 12a of the upper valve fitting 12, thereby fixing the electromagnetic device within the first section of the lower valve channel.

[0033] The support sleeve 28 forms an axially penetrating support sleeve channel, and the support sleeve 28 is partially fixed within the second section 24 of the upper valve channel, the coil housing channel, and the lower valve channel. The outer peripheral wall of the support sleeve 28 can at least partially contact the inner peripheral wall of the upper valve fitting 12, the inner peripheral surface of the coil housing 32, and the inner peripheral wall of the second pipe section 22.

[0034] Optionally, an elastic seal 36, such as a sealing ring or gasket, can be provided between the protrusion 34 of the coil housing 32 and the outer peripheral wall of the support sleeve 28 to ensure a sealed engagement between the coil housing 32 and the lower valve fitting 14 to the support sleeve 28. For example, the elastic seal 36 fills the space defined by the protrusion 34, the upper radial support surface of the transition pipe region 26, and the outer peripheral wall of the support sleeve 28. Thus, the support sleeve passage and the lower valve passage are isolated from the outside of the injection valve 10.

[0035] The injection valve 10 may further include a core ring 40 and an armature ring 42 disposed radially opposite to the electromagnetic device within the support sleeve channel. The lower axial end face of the core ring 40 and the upper axial end face of the armature ring 42 are axially separated by a certain working air gap 44 (the actual working air gap is at the micrometer level; for clarity, it is shown as...). Figure 1 (Exaggerated display) That is to say, the armature ring 42 is located below the core ring 40. The core ring 40 forms an axially penetrating core ring channel. The armature ring 42 forms an axially penetrating armature ring channel. The core ring channel is in fluid communication with the armature ring channel. The core ring 40 is fixed within the support sleeve channel; for example, the outer peripheral surface of the core ring 40 may at least partially contact the inner peripheral wall of the support sleeve 28.

[0036] The injection valve 10 may also include a valve stem 44. For example, the valve stem 44 is formed by rolling a sheet of metal to form a valve stem channel 46 and a slot 48 that axially penetrate the valve stem 44, the slot 48 being in fluid communication with the valve stem channel 46. That is, two sides of the rolled sheet of metal are close to each other but also spaced apart. Because the sheet of metal is surface-treated to be flat and burr-free, the valve stem 44 formed by rolling the sheet of metal is also flat and burr-free. The valve stem 44 may also include a plurality of orifices 50 that radially penetrate the rolled sheet of metal. The upper axial end of the valve stem 44 can be inserted into the lower axial end of the armature ring 42 to be located within the armature ring channel.

[0037] Optionally, the clamping protrusion 52 extends axially downward from the lower axial end of the armature ring 42 and extends from the support sleeve channel to clamp the upper axial end of the valve stem 44, thereby facilitating the fixing and sealing of the clamping protrusion 52 and the armature ring 42 to the valve stem 44 by welding. For example, the clamping protrusion 52 is integrally formed with the lower axial end of the armature ring 42.

[0038] The injection valve 10 may further include an adjusting sleeve 54 and a spring 56. The adjusting sleeve 54 forms an adjusting sleeve channel axially extending through the adjusting sleeve 54. The lower axial end of the adjusting sleeve 54 is inserted into the upper axial end of the core ring 40 to be located within the core ring channel. The outer peripheral wall of the lower axial end of the adjusting sleeve 54 may at least partially contact the inner peripheral wall of the upper axial end of the core ring 40. During use of the injection valve 10, the adjusting sleeve 54 is fixed relative to the core ring 40. During installation of the injection valve 10, the operator may axially move the adjusting sleeve 54 to change the depth to which the lower axial end of the adjusting sleeve 54 is inserted into the upper axial end of the core ring 40. The spring 56 may be... Figure 1 The spring 56 can be a helical spring or any other type of spring. Spring 56 is located within both the core ring channel and the armature ring channel. The upper axial end of spring 56 abuts against the lower axial end face of the adjusting sleeve 54, and the lower axial end of spring 56 abuts against the upper axial end face of the valve stem 44, thereby applying an axially downward preloaded spring force to the valve stem 44 and the armature ring 42. Therefore, the preloaded spring force can be determined based on the depth to which the lower axial end of the sleeve is inserted into the upper axial end of the core ring 40.

[0039] You can continue to refer to this. Figure 1 And such as Figure 2As shown in detail, the injection valve 10 may further include a valve seat 58, which forms a valve seat passage axially extending through the valve seat 58. The valve seat 58 can be inserted into the lower axial end 14b of the lower valve fitting 14 to be located within the lower valve passage. For example, the outer peripheral surface of the valve seat 58 can at least partially contact the inner peripheral wall of the lower valve fitting 14, and the valve seat 58 can be sealed to the lower axial end 14b of the lower valve fitting 14 by welding to ensure the stability of the position of the valve seat 58 in the injection valve 10. Thus, the valve seat passage is in fluid communication with the lower valve passage.

[0040] Continue to refer to Figure 2 The injection valve 10 may also include a ball valve 60 connected, for example welded to, the lower axial end of the valve stem 44, and the ball valve 60 is disposed within a valve seat passage. For example, the valve seat 58 includes a main segment and an engagement ring 58d connected to the main segment. Figure 2 In the diagram, the segments of the main section and the engaging ring 58d are separated by dashed lines for clear illustration. Specifically, the main section may include a first segment 58a, a second segment 58b connecting to the first segment 58a from below, and a third segment 58c connecting to the second segment 58b from below. The first segment 58a of the second valve seat 58 forms a first section of the valve seat passage, the diameter of which matches the diameter of the ball valve 60 to receive at least a majority of the ball valve 60. The second segment 58b of the valve seat 58 protrudes radially inward relative to the first segment 58a, thereby forming a second section of the valve seat passage. That is, within the second section of the valve seat passage, the ball valve 60 can be seated on the inner peripheral wall of the second segment 58b of the valve seat 58. The third segment 58c of the valve seat 58 forms the third section of the valve seat passage (also known as the radially narrowed section). The diameter of the third section of the valve seat passage is significantly smaller than the diameter of the first section of the valve seat passage, so that the ball valve 60, which sits on the inner peripheral wall of the second segment 58b of the valve seat 58, can block the third section of the valve seat passage.

[0041] Optionally, the engaging ring 58d extends axially downward from the third segment 58c to form a fourth section (also known as a radially enlarged section) of the valve seat passage, the diameter of which is between the diameter of the first section and the diameter of the third section of the valve seat passage.

[0042] When the electromagnetic device or electromagnetic coil 30 is not activated, the armature ring 42 moves slightly downward (e.g., at the micrometer level) axially within the support sleeve channel due to the preloaded spring force, causing the ball valve 60 to block the valve seat channel via the valve stem 44. Specifically, the ball valve 60 blocks the third section of the valve seat channel by sitting on the inner peripheral wall of the second segment 58b of the valve seat 58. At this time, the working air gap 44 reaches its maximum. When the electromagnetic device or electromagnetic coil 30 is activated, the armature ring 42 can move slightly upward axially within the support sleeve channel under electromagnetic force, causing the ball valve 60 to leave the inner peripheral wall of the second segment 58b of the valve seat 58 via the valve stem 44. The valve seat channel opens, specifically, the third section of the valve seat channel is fluidly connected to the second section of the valve seat channel. At this time, the working air gap 44 decreases. By welding the valve seat 58 to the lower axial end 14b of the lower valve fitting 14, the stability of the position of the valve seat 58 in the injection valve 10 is ensured, which is beneficial for the armature ring 42 to reliably control the blocking and opening of the valve seat passage under such a stroke.

[0043] In this invention, the injection valve 10 may also include an orifice plate assembly.

[0044] like Figure 3 As shown in detail, the orifice plate assembly includes a connecting fitting 62, which includes a main pipe section comprising a first pipe section 62a and a second pipe section 62b connecting to the first pipe section 62a from below. Figure 3 In the diagram, the first pipe segment 62a and the second pipe segment 62b are separated by a dashed line for clear illustration. The first pipe segment 62a forms a first pipe segment channel axially penetrating the first pipe segment 62a. The second pipe segment 62b forms a second pipe segment channel axially penetrating the second pipe segment 62b. The second pipe segment channel is in fluid communication with the first pipe segment channel. The diameter of the second pipe segment channel is smaller than the diameter of the first pipe segment channel; that is, the second pipe segment 62b protrudes radially inward relative to the first pipe segment 62a to form an upper radially supporting surface 62b1.

[0045] Optionally, an internal thread 62a1 is formed on at least a portion of the inner circumferential wall of the first pipe section 62a of the connecting pipe fitting 62, while an external thread 14b1 (as shown in the image) is formed on the inner circumferential wall of the first pipe section 62a of the connecting pipe fitting 62. Figure 2 (As shown) is formed on at least a portion of the outer peripheral wall of the lower axial end 14b of the lower valve fitting 14. The external thread 14b1 of the lower valve fitting 14 and the internal thread 62a1 of the connecting fitting 62 can engage with each other until the upper radial support surface 62b1 of the second section 62b of the connecting fitting 62 contacts the lower axial end face 14b2 of the lower valve fitting 14 (as shown). Figure 2 As shown), to position the lower axial end 14b of the lower valve fitting 14 within the first pipe section channel (as shown). Figure 1 and Figure 4 (As shown).

[0046] like Figure 4 As shown, an elastic seal 63, such as a sealing ring or a sealing gasket, can be provided between the upper radial support surface 62b1 of the second pipe section 62b of the connecting pipe 62 and the lower axial end face 14b2 of the lower valve pipe 14 to ensure that the connecting pipe 62 is detachably and sealingly connected around the lower axial end 14b of the lower valve pipe 14.

[0047] Alternatively or additionally, threadlocker may be applied between the external thread 14b1 of the lower valve fitting 14 and the internal thread 62a1 of the connecting fitting 62 to ensure that the connecting fitting 62 is detachably and sealingly engaged around the lower axial end 14b of the lower valve fitting 14.

[0048] like Figure 4 As shown, and can be returned to Figure 3 The orifice plate assembly also includes an orifice plate 64 connected to the connecting pipe 62. The orifice plate 64 is, for example, substantially flat and includes a central region 64a having at least one nozzle 64a1 and a peripheral region 64b surrounding the central region 64a.

[0049] Continue to refer to Figure 4 A portion of the valve seat 58 may extend from the lower axial end 14b of the lower valve fitting 14. When the connecting fitting 62 is detachably and sealingly engaged with the lower valve fitting 14, said portion of the valve seat 58 is received within the second pipe section passage to contact the peripheral region 64b of the orifice plate 64, thereby aligning and fluidly communicating the at least one nozzle 64a1 of the central region 64a of the orifice plate 64 with the valve seat passage (specifically, the fourth section of the valve seat passage). It is understood that the fourth section of the valve seat passage is enlarged compared to the third section to facilitate alignment with the at least one nozzle 64a1 of the central region 64a of the orifice plate 64.

[0050] Return to Figure 3 Optionally, the connecting fitting 62 further includes a support ring 62c connected to the second pipe segment 62b opposite to the first pipe segment 62a, or a support ring 62c connected from below the second pipe segment 62b. The second pipe segment 62b and the support ring 62c are separated by a dashed line for clarity. The support ring 62c protrudes radially inward relative to the second pipe segment 62b to form an axial opening and an upper radial engagement surface 62c1, that is, the diameter of the axial opening is smaller than the diameter of the second pipe segment channel.

[0051] For example, the peripheral region 64b of the orifice plate 64 can be welded to the upper radial engagement surface 62c1 of the supporting convex ring 62c. Alternatively, two or more circumferential welds can be provided at different diameters of the peripheral region 64b of the orifice plate 64 to ensure a reliable sealing engagement of the peripheral region 64b of the orifice plate 64 with respect to the second pipe segment 62b of the connecting fitting 62.

[0052] Optionally, the peripheral region 64b of the orifice plate 64 can be sealed to the upper radial engagement surface 62c1 of the support ring 62c by a sealant.

[0053] Optionally, such as Figure 5 As shown, the support ring 62c includes an annular sealant groove 66 that is recessed relative to the upper radial engagement surface 62c1 of the support ring 62c, i.e., extends axially downward, for receiving sealant.

[0054] Optionally, such as Figure 6 As shown, without the support ring 62c, the peripheral area 64b of the orifice plate 64 can also be welded to the lower end face of the second pipe section 62b.

[0055] Optionally, such as Figure 7 As shown, the orifice plate 64 can also be integrally formed on the connecting pipe 62.

[0056] It is known that the upper axial end of the upper valve fitting 12 forms an inlet to the injection valve 10 or is in fluid communication with the inlet of the injection valve 10 for receiving fluid to be injected by the injection valve 10. For example, when the injection valve 10 is used in a fuel injection system, the fluid can be fuel. As another example, when the injection valve 10 is used in an SCR urea injection system, the fluid can be urea solution. It is understood that the injection valve 10 can also be used in various other suitable injection systems.

[0057] Taking the injection valve 10 as an example in the SCR urea injection system, the injection valve 10 will be installed in the exhaust pipe. When the electromagnetic device or electromagnetic coil 30 is activated, the valve seat channel opens, and the pressurized urea solution enters from the inlet of the injection valve 10, then passes through the regulating sleeve channel, the iron core ring channel, the armature ring channel and the valve stem channel 46, and then flows out from the slot 48 of the valve stem 44 and the plurality of orifices 50 to enter the lower valve channel, and then passes through the valve seat channel and the at least one spray hole 64a1 to be sprayed into the exhaust pipe to react with the nitrogen-containing oxides in the exhaust gas flowing through the exhaust pipe.

[0058] Since the orifice plate assembly, i.e. the connecting pipe 62, is detachably sealed to the lower axial end of the valve pipe, the orifice plate assembly can be replaced at low cost and high efficiency when the at least one nozzle 64a1 of the orifice plate 64 is blocked for various reasons, resulting in insufficient urea solution injection or even cessation of injection.

[0059] While some specific embodiments of the present invention have been described in detail by way of examples, those skilled in the art should understand that the above examples are for illustrative purposes only and are not intended to limit the scope of the present invention. Those skilled in the art should understand that modifications can be made to the above embodiments without departing from the scope and spirit of the present invention. The scope of the present invention is defined by the appended claims.

Claims

1. A jet valve (10), characterized in that, include: Valve fitting (12), which forms a valve passage axially penetrating the valve fitting (12); A valve seat (58) forming an axially extending valve seat passage, the valve seat (58) being sealingly engaged with one axial end (12a) of the valve fitting (12) such that the valve seat passage is in fluid communication with the valve passage; and An orifice plate (64) includes at least one nozzle (64a1) and a peripheral region (64b) surrounding the at least one nozzle (64a1); as well as A connecting fitting (62) is connected to the orifice plate and detachably and sealingly engaged with one axial end (12a) of the valve fitting (12) such that a peripheral region (64b) of the orifice plate (64) contacts the valve seat (58) and the at least one nozzle (64a1) is in fluid communication with the valve seat passage.

2. The injection valve (10) according to claim 1, characterized in that, The valve seat (58) is inserted into one axial end (12a) of the valve fitting (12), and a portion of the valve seat (58) extends from the one axial end (12a) of the valve fitting (12) to contact the peripheral area (64b) of the orifice plate (64).

3. The injection valve (10) according to claim 1 or 2, characterized in that, The connecting fitting (62) is detachably sealed around one axial end (12a) of the valve fitting (12) by a threaded connection coated with thread-locking adhesive. or The connecting pipe (62) is detachably sealed to the valve fitting (12) by means of a threaded connection and an elastic seal (63) disposed between the connecting pipe (62) and the valve fitting (12) at one axial end (12a).

4. The injection valve (10) according to claim 1 or 2, characterized in that, The connecting fitting (62) includes main pipe sections (62a, 62b) and a support ring (62c) connected to the main pipe sections (62a, 62b). The support ring (62c) protrudes radially inward relative to the main pipe sections (62a, 62b) to form a radial engagement surface (62c1) close to the main pipe sections (62a, 62b). The peripheral region (64b) of the orifice plate (64) is sealed to the radial engagement surface (62c1) of the support ring (62c) by welding.

5. The injection valve (10) according to claim 1 or 2, characterized in that, The connecting fitting (62) includes main pipe sections (62a, 62b) and a support ring (62c) connected to the main pipe sections (62a, 62b). The support ring (62c) protrudes radially inward relative to the main pipe sections (62a, 62b) to form a radial engagement surface (62c1) close to the main pipe sections (62a, 62b). The peripheral area (64b) of the orifice plate (64) is sealed to the radial engagement surface (62c1) of the support ring (62c) by sealant.

6. The injection valve (10) according to claim 5, characterized in that, The support ring (62c) also includes a sealant groove (66) recessed relative to the radial engagement surface (62c1) for receiving sealant.

7. The injection valve (10) according to claim 1 or 2, characterized in that, The peripheral area (64b) of the orifice plate (64) is sealed to one end face of the joint fitting (62) by welding, or the orifice plate (64) is integrally formed on the joint fitting (62).

8. The injection valve (10) according to claim 1 or 2, characterized in that, The valve seat (58) includes main segments (58a, 58b, 58c) and a connecting ring (58d) connected to the main segments (58a, 58b, 58c). A portion of the main segments (58a, 58b, 58c) adjacent to the connecting ring (58d) forms a radially narrowed section of the valve seat passage for sealing by the ball valve (60) of the injection valve (10). The connecting ring (58d) extends axially downward relative to the main segments (58a, 58b, 58c) to form a radially widened section of the valve seat passage for alignment with the at least one nozzle (64a1) of the orifice plate (64).

9. The injection valve (10) according to claim 1 or 2, characterized in that, The injection valve (10) also includes: A ball valve (60) disposed within a valve seat passage; and A valve stem (44) is disposed in a valve passage, and one axial end of the valve stem (44) is fixed to a ball valve (60). The valve stem (44) is formed by rolling a sheet metal plate to form a valve stem passage (46) and a slot (48) that axially penetrate the valve stem (44). The slot (48) is in fluid communication with the valve stem passage (46).

10. The injection valve (10) according to claim 9, characterized in that, The injection valve (10) also includes: A support sleeve (28) fixed within the valve passage; and An armature ring (42) is movably inserted into a support sleeve (28), and the other axial end of the valve stem (44) is fixed to the armature ring (42). The armature ring (42) includes a clamping protrusion (52) that extends axially downward from one axial end of the armature ring (42) and extends out from the channel of the support sleeve (28) to clamp the other axial end of the valve stem (44), thereby facilitating the sealing connection of the clamping protrusion (52) and the armature ring (42) to the valve stem (44) by welding.

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