Injector and engine

Abstract

This utility model discloses an injector and an engine. The injector includes a nozzle body, an intermediate body, a needle valve, and a valve seat. The nozzle body has a cavity. At least a portion of the intermediate body is located within the cavity and is connected to the nozzle body. The needle valve is located within the cavity. The needle valve has a degree of freedom of movement along the axial direction of the nozzle body. The needle valve has a first end near the intermediate body and a second end opposite to the first end. The valve seat is located within the cavity. The first end of the valve seat is located within the cavity, and when the nozzle body is in a non-injecting state, the second end contacts the valve seat, and the valve seat is movably connected to the nozzle body. This movable connection between the valve seat and the nozzle body allows for adjustment of the needle valve's stroke, reducing the probability of the needle valve's stroke exceeding the design or specified stroke error range, lowering the injector's scrap rate, and resulting in a high yield and low cost for the injector.

Description

Technical Field

[0001] This utility model belongs to the field of automotive technology, and in particular relates to an injector and an engine. Background Technology

[0002] The methanol injector is an important component of the methanol engine fuel supply system. Its main function is to inject methanol fuel into the engine cylinder in the form of atomized particles to ensure the normal operation of the engine.

[0003] like Figure 1 As shown, in the prior art, the methanol injector 100 includes a nozzle body 103 with an inner cavity, an intermediate body 101, a needle valve 104, a valve seat 105, and an elastic element 102. The intermediate body 101, needle valve 104, and valve seat 105 are arranged along the axial direction of the nozzle body 103. The intermediate body 101 and the nozzle body 103 of the methanol injector 100 are connected together by an interference fit, and the valve seat 105 and the nozzle body 103 are connected together by welding, resulting in the non-adjustable stroke of the needle valve 104. Because the stroke of the needle valve 104 is not adjustable, if the stroke of the needle valve 104 exceeds the design or specified stroke error range, the injector 100 will be scrapped, resulting in a low yield and high cost. Utility Model Content

[0004] This utility model aims to at least partially solve one of the technical problems in the related art.

[0005] An injector, comprising:

[0006] A nozzle body having a cavity;

[0007] An intermediate body, at least a portion of which is located within the cavity, is connected to the nozzle body;

[0008] A needle valve, located within the cavity, having a degree of freedom of movement along the axial direction of the nozzle body, having a first end near the intermediate body and a second end opposite to the first end; and

[0009] A valve seat is located inside the cavity. When the injector is in a non-injecting state, the second end contacts the valve seat, and the valve seat is movably connected to the nozzle body.

[0010] In some embodiments, a clamping cap is further included, which is connected to the nozzle body and contacts the valve seat, at least a portion of which is located in the cavity, and the thickness of the portion of the clamping cap located in the cavity is adjustable.

[0011] In some embodiments, the tight cap is detachably connected to the nozzle body.

[0012] In some embodiments, the tight cap is provided with a positioning groove, and one end of the nozzle body near the tight cap is inserted into the positioning groove.

[0013] In some embodiments, a tightening cap and an adjusting shim are also included, the tightening cap being detachably connected to the nozzle body and the adjusting shim being located within the cavity.

[0014] In some embodiments, multiple adjustment shims are provided, and at least two of the adjustment shims have different thicknesses.

[0015] In some embodiments, the adjusting shim is located between the valve seat and the tightening cap, with one side of the adjusting shim contacting the valve seat and the other side of the adjusting shim contacting the tightening cap.

[0016] In some embodiments, the adjusting shim is located between the intermediate body and the needle valve, and one side of the adjusting shim is in contact with the needle valve.

[0017] In some embodiments, an elastic element is further included, at least a portion of which is located in the cavity and is connected to the needle valve.

[0018] An engine includes an injector and a cylinder as described above, the injector being disposed in the cylinder.

[0019] This utility model provides an injector and an engine. The injector includes a nozzle body, an intermediate body, a needle valve, and a valve seat. The nozzle body has a cavity. At least a portion of the intermediate body, the needle valve, and the valve seat are located within the cavity. The intermediate body is connected to the nozzle body. The needle valve has a degree of freedom of movement along the axial direction of the nozzle body. The needle valve has a first end near the intermediate body and a second end opposite to the first end. When the nozzle body is in a non-injecting state, the second end contacts the valve seat. The valve seat is movably connected to the nozzle body. This movable connection between the valve seat and the nozzle body allows for adjustment of the needle valve's stroke, reducing the probability of the needle valve's stroke exceeding the design or specified stroke error range, lowering the injector's scrap rate, and resulting in a high yield and low cost for the injector. Attached Figure Description

[0020] To more clearly illustrate the technical solutions in the embodiments of this application, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0021] Figure 1 This is a schematic diagram of the structure of an existing injector;

[0022] Figure 2This is a schematic diagram of the structure of the injector provided in some embodiments of this utility model;

[0023] Figure 3 This is a cross-sectional view of the injector provided in some embodiments of this utility model.

[0024] Marker explanation:

[0025] 10. Injector;

[0026] 1. Intermediate body; 11. First plane;

[0027] 2. Elastic components;

[0028] 3. Nozzle body; 31. Cavity;

[0029] 4. Needle valve; 41. Mounting groove; 42. Second plane;

[0030] 5. Valve seat;

[0031] 6. Adjusting shims; 61. Clearance holes;

[0032] 7. Tightening cap; 71. Positioning groove; 72. Flow hole;

[0033] h1, Adjust the thickness of the shim;

[0034] h2, the thickness of the portion located in the cavity. Detailed Implementation

[0035] The present application will now be described in further detail with reference to the accompanying drawings and embodiments. It should be particularly noted that the following embodiments are for illustrative purposes only and do not limit the scope of the application. Similarly, the following embodiments are only some, not all, embodiments of the present application, and all other embodiments obtained by those skilled in the art without inventive effort are within the scope of protection of the present application.

[0036] The terms "first," "second," and "third" used in the embodiments of this application are for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Therefore, a feature defined as "first," "second," or "third" may explicitly or implicitly include at least one of that feature. In the description of this application, "multiple" means at least two, such as two, three, etc., unless otherwise explicitly specified. All directional indications (such as up, down, left, right, front, back, etc.) in the embodiments of this application are only used to explain the relative positional relationships and movement of components in a specific posture (as shown in the figures). If the specific posture changes, the directional indication will also change accordingly. The terms "comprising" and "having," and any variations thereof, in the embodiments of this application are intended to cover non-exclusive inclusion. For example, a process, method, system, product, or device that includes a series of steps or units is not limited to the listed steps or units, but may optionally include steps or units not listed, or may optionally include other steps or components inherent to these processes, methods, products, or devices.

[0037] Please see Figure 2 and Figure 3 On one hand, this utility model provides an injector 10. The injector 10 includes a nozzle body 3, an intermediate body 1, a needle valve 4, and a valve seat 5. The nozzle body 3 has a cavity 31. At least a portion of the intermediate body 1 is located within the cavity 31, and the intermediate body 1 is connected to the nozzle body 3. The needle valve 4 is located within the cavity 31. The needle valve 4 has a degree of freedom of movement along the axial direction of the nozzle body 3. The needle valve 4 has a first end near the intermediate body 1 and a second end disposed opposite to the first end. The valve seat 5 is located within the cavity 31. When the injector 10 is in a non-injecting state, the second end contacts the valve seat 5, and the valve seat 5 is movably connected to the nozzle body 3.

[0038] Specifically, the nozzle body 3 has a cavity 31, within which the needle valve 4 can move axially along the nozzle body 3. The needle valve 4 has a first position and a second position. When the injector 10 is in a non-injection state, the needle valve 4 is in the first position, with its second end contacting the valve seat 5. A gap exists between the needle valve 4 and the intermediate body 1, meaning the needle valve 4 and the intermediate body 1 are spaced apart. In the first position, the injector 10 does not inject fuel. When the needle valve 4 moves away from the first position, the injector 10 can inject fuel. When the needle valve 4 moves to the second position, it contacts the intermediate body 1, and a gap exists between the needle valve 4 and the valve seat 5, meaning the needle valve 4 and the valve seat 5 are spaced apart.

[0039] The stroke of needle valve 4: the distance between the upper and lower dead points of any point on needle valve 4 of injector 10. A first plane 11 is provided on the end face of needle valve 4 near the intermediate body 1, and a second plane 42 is provided on the end face of intermediate body 1 near needle valve 4. The first plane 11 and the second plane 42 are arranged in parallel. Therefore, the stroke of needle valve 4 can also be expressed as the distance between the first plane 11 and the second plane 42.

[0040] In some embodiments, the intermediate body 1 is connected to the nozzle body 3 by an interference fit. Of course, the intermediate body 1 can also be connected to the nozzle body 3 in other ways. For example, the intermediate body 1 can be connected to the nozzle body 3 by welding.

[0041] In summary, the injector 10 provided by this utility model includes a nozzle body 3, an intermediate body 1, a needle valve 4, and a valve seat 5. The nozzle body 3 has a cavity 31. At least a portion of the intermediate body 1, the needle valve 4, and the valve seat 5 are all located within the cavity 31. The intermediate body 1 is connected to the nozzle body 3. The needle valve 4 has a degree of freedom of movement along the axial direction of the nozzle body 3. The needle valve 4 has a first end near the intermediate body 1 and a second end opposite to the first end. When the nozzle body 3 is in a non-spraying state, the second end contacts the valve seat 5. The valve seat 5 is movably connected to the nozzle body 1. The movable connection between the valve seat 5 and the nozzle body 3 of this injector 10 allows for adjustment of the stroke of the needle valve 4, reducing the probability that the stroke of the needle valve 4 exceeds the design or specified stroke error range, reducing the scrap rate of the injector 10, and resulting in a high yield and low cost for the injector 10.

[0042] In some embodiments, a tightening cap 7 is also included, which is connected to the nozzle body 3 and contacts the valve seat 5. At least a portion of the tightening cap 7 is located in the cavity 31, and the thickness h2 of the portion of the tightening cap 7 located in the cavity 31 is adjustable.

[0043] The nozzle body 3 has an opening at one end along its axial direction, and the tight cap 7 is located at the opening and connected to the nozzle body 3.

[0044] The cap 7 is provided with a flow hole 72. By providing the flow hole 72, the fuel injection can be prevented from being blocked. When the needle valve 4 leaves the first position, the fuel can be injected from the injector 10 through the flow hole 72.

[0045] In some embodiments, the flow hole 72 is a circular hole. Of course, in other embodiments, the flow hole 72 may also be an elliptical hole or a polygonal hole.

[0046] Furthermore, the flow hole 72 is a stepped hole.

[0047] In some embodiments, the clamping cap 7 is detachably connected to the nozzle body 3. By making the clamping cap 7 detachably connected to the nozzle body 3, the valve seat 5 and the nozzle body 3 can be movably connected by replacing different clamping caps 7.

[0048] In some embodiments, multiple tightening caps 7 are provided, and at least two tightening caps 7 have different thicknesses h2 in the portions located within the cavity 31. By providing multiple tightening caps 7 and ensuring that the thickness h2 of the portions located within the cavity 31 of at least two tightening caps 7 is different, the stroke of the needle valve 4 can be adjusted by replacing different tightening caps 7 during use, making the operation convenient and quick. In use, a suitable tightening cap 7 is selected as needed and connected to the nozzle body 3 to adjust the stroke of the needle valve 4. By replacing the tightening cap 7 with a portion of greater thickness h2 within the cavity 31, the stroke of the needle valve 4 is shortened; by replacing the tightening cap 7 with a portion of smaller thickness within the cavity 31, the stroke of the needle valve 4 is increased.

[0049] The number of tight caps 7 can be set to two, three, or more.

[0050] The thickness h2 of the portion of at least two tight caps 7 located in the cavity 31 is different. This can be understood as the thickness h2 of the portion of any two tight caps 7 located in the cavity 31 being different. Of course, when there are three or more tight caps 7, the thickness h2 of the portion of two tight caps 7 located in the cavity 31 may be different, while the thickness h2 of the portion of some tight caps 7 located in the cavity 31 may be equal.

[0051] Of course, in other embodiments, the tightening cap 7 can also be fixedly connected to the nozzle body 3. For example, the tightening cap 7 can be fixedly connected to the nozzle body 3 by welding. When the tightening cap 7 is fixedly connected to the nozzle body 3, one end of the tightening cap 7 located within the cavity 31 is provided with a telescopic part. The length of the telescopic part along the axial direction of the nozzle body 3 can be adjusted. By adjusting the length of the telescopic part, the stroke of the needle valve 4 can be adjusted. For example, the telescopic part can be a telescopic cylinder.

[0052] In some embodiments, the tightening cap 7 is threadedly connected to the nozzle body 3. This threaded connection allows for a convenient and quick detachable connection between the tightening cap 7 and the nozzle body 3. When the tightening cap 7 needs to be replaced, it can be simply unscrewed from the nozzle body 3, making the operation simple.

[0053] The threaded connection between the cap 7 and the nozzle body 3 is just one implementation method for achieving a detachable connection between them. In other embodiments, the cap 7 and the nozzle body 3 can also be detachably connected by a snap-fit ​​mechanism. Specifically, one of the cap 7 and the nozzle body 3 has a snap-fit, and the other has a slot. The snap-fit ​​engages with the slot, allowing the cap 7 to be detachably connected to the nozzle body 3 via a snap-fit ​​connection. Of course, the cap 7 and the nozzle body 3 can also be detachably connected by inserting one of them into the other.

[0054] In some embodiments, the tightening cap 7 is provided with a positioning groove 71, and one end of the nozzle body 3 near the tightening cap 7 is inserted into the positioning groove 71. By providing the positioning groove 71 on the tightening cap 7, on the one hand, it is convenient to insert one end of the tightening cap 7 into the cavity 31, and on the other hand, it is more convenient to realize the threaded connection between the tightening cap 7 and the nozzle body 3.

[0055] Furthermore, the positioning groove 71 is provided with a first groove wall and a second groove wall. The end of the nozzle body 3 near the tight cap 7 is located between the first groove wall and the second groove wall. The outer side wall of the nozzle body 3 faces the first groove wall, and the inner side wall of the nozzle body 3 faces the second side wall. The first groove wall is provided with an internal thread, and the outer side wall of the nozzle body 3 is provided with an external thread, so as to realize the threaded connection between the tight cap 7 and the nozzle body 3.

[0056] In some embodiments, a tightening cap 7 and an adjusting shim 6 are also included. The tightening cap 7 is detachably connected to the nozzle body 3, and the adjusting shim 6 is located within the cavity 31. By providing the tightening cap 7 and the adjusting shim 6, the tightening cap 7 is detachably connected to the nozzle body 3, and the adjusting shim 6 is located within the cavity 31, a movable connection between the valve seat 5 and the nozzle body 3 can be achieved.

[0057] In some embodiments, multiple adjusting shims 6 are provided, with at least two adjusting shims 6 having different thicknesses h1. By providing multiple adjusting shims 6 and ensuring that at least two adjusting shims 6 have different thicknesses h1, the stroke of the needle valve 4 can be adjusted by replacing different tightening caps 7 or using different numbers of adjusting shims 6, making the operation convenient and quick. In use, a suitable adjusting shim 6 is selected as needed, or an appropriate number of adjusting shims 6 are used, and the adjusting shims 6 are placed in the cavity 31 to adjust the stroke of the needle valve 4. By replacing with a thicker adjusting shim 6 or using more adjusting shims 6, the stroke of the needle valve 4 can be shortened; by replacing with a thinner adjusting shim 6 or using fewer adjusting shims 6, the stroke of the needle valve 4 can be increased.

[0058] The number of shims 6 can be set to two, three, or more.

[0059] At least two adjusting shims 6 have different thicknesses h1. This can be understood as any two adjusting shims 6 having different thicknesses h1. Of course, when there are three or more adjusting shims 6, it is possible that two of the adjusting shims 6 have different thicknesses h1, while some of the adjusting shims 6 have the same thickness h1.

[0060] The adjusting shim 6 is a cylindrical structure. Of course, in other embodiments, the adjusting shim 6 can also be an elliptical cylindrical structure or a polygonal prism structure.

[0061] It is understandable that the multiple adjusting shims 6 can all be cylindrical structures or multiple adjusting shims 6 can all be elliptical cylindrical structures. Of course, it is also possible that some adjusting shims 6 are cylindrical structures and the rest are elliptical cylindrical structures.

[0062] In some embodiments, the adjusting shim 6 is located between the valve seat 5 and the tightening cap 7, with one side of the adjusting shim 6 contacting the valve seat 5 and the other side of the adjusting shim 6 contacting the tightening cap 7. By placing the adjusting shim 6 between the valve seat 5 and the tightening cap 7, and ensuring that one side of the adjusting shim 6 contacts the valve seat 5 and the other side contacts the tightening cap 7, the distance between the tightening cap 7 and the valve seat 5 can be adjusted when the adjusting shim 6 is replaced, thereby adjusting the distance between the intermediate body 1 and the valve seat 5, and thus adjusting the stroke of the needle valve 4.

[0063] In some embodiments, the adjusting shim 6 is located between the intermediate body 1 and the needle valve 4, with one side of the adjusting shim 6 in contact with the needle valve 4. By placing the adjusting shim 6 between the intermediate body 1 and the needle valve 4, and ensuring that one side of the adjusting shim 6 is in contact with the needle valve 4, the distance between the adjusting shim 6 and the intermediate body 1 can be adjusted when the adjusting shim 6 is replaced, thereby adjusting the stroke of the needle valve 4.

[0064] In some embodiments, the adjusting shim 6 is provided with a clearance hole 61. By providing the clearance hole 61 on the adjusting shim 6, it is possible to avoid obstructing the injector 10 from injecting fuel.

[0065] In some embodiments, the clearance hole 61 is a circular hole. Of course, in other embodiments, the clearance hole 61 may also be an elliptical hole or a polygonal hole.

[0066] In some embodiments, the outer diameter of the adjusting shim 6 is the same as the inner diameter of the nozzle body 3.

[0067] In some embodiments, an elastic element 2 is further included, at least a portion of which is located in the cavity 31, and the elastic element 2 is connected to the needle valve 4. By providing the elastic element 2, the needle valve 4 can move axially along the nozzle body 3 under the elastic force of the elastic element 2, thereby moving the needle valve 4 from the second position to the first position.

[0068] Furthermore, the elastic element 2 is a spring.

[0069] In some embodiments, the needle valve 4 is provided with a mounting groove 41, and the elastic element 2 is partially disposed within the mounting groove 41. By providing a mounting groove 41 on the needle valve 4, the connection between the spring and the needle valve 4 can be easily achieved.

[0070] In some embodiments, the mounting groove 41 is a circular groove. Of course, in other embodiments, the mounting groove 41 may also be an elliptical groove or a polygonal groove.

[0071] In use, first fix the intermediate body 1 to the nozzle body 3, then place the needle valve 4 and valve seat 5 into the cavity 31. At this time, the adjusting shim 6 can be placed into the inner cavity, or the adjusting shim 6 can be left out. Finally, connect the tightening cap 7 to the nozzle body 3 to complete the assembly of the injector 10. Next, use a stroke detection fixture to test the stroke of the needle valve 4 of the injector 10. If the tested stroke of the needle valve 4 is less than the design value range, the stroke of the needle valve 4 can be brought within the design value range by replacing it with a thinner adjusting shim 6. If the tested stroke of the needle valve 4 is greater than the design value range, the stroke of the needle valve 4 can be brought within the design value range by replacing it with a larger adjusting shim 6.

[0072] It should be noted that the travel detection fixture is existing technology and will not be described in detail here.

[0073] The design value range is set according to the actual usage requirements of the injector 10, and no specific restrictions are imposed here.

[0074] On the other hand, this utility model also provides an engine. The engine includes the aforementioned injector 10 and a cylinder, with the injector 10 disposed in the cylinder. Because the engine includes the aforementioned injector 10, it also has the advantages of high yield and low cost.

[0075] In the description of this utility model, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this utility model and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model.

[0076] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this utility model, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0077] In this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection, an electrical connection, or a connection that allows communication between them; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0078] In this utility model, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0079] In this utility model, the terms "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., refer to a specific feature, structure, material, or characteristic described in connection with that embodiment or example, which is included in at least one embodiment or example of this utility model. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0080] Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Those skilled in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of the present invention.

Claims

1. An injector, characterized in that, include: A nozzle body having a cavity; An intermediate body, at least a portion of which is located within the cavity, is connected to the nozzle body; A needle valve is located within the cavity and has a degree of freedom of movement along the axial direction of the nozzle body. The needle valve has a first end near the intermediate body and a second end opposite to the first end. as well as A valve seat is located inside the cavity. When the injector is in a non-injecting state, the second end contacts the valve seat, and the valve seat is movably connected to the nozzle body.

2. The injector according to claim 1, characterized in that, It also includes a tightening cap, which is connected to the nozzle body and contacts the valve seat. At least a portion of the tightening cap is located in the cavity, and the thickness of the portion of the tightening cap located in the cavity is adjustable.

3. The injector according to claim 2, characterized in that, The tight cap is detachably connected to the nozzle body.

4. The injector according to claim 3, characterized in that, The tight cap is provided with a positioning groove, and one end of the nozzle body near the tight cap is inserted into the positioning groove.

5. The injector according to claim 1, characterized in that, It also includes a tightening cap and an adjusting shim, the tightening cap being detachably connected to the nozzle body, and the adjusting shim being located within the cavity.

6. The injector according to claim 5, characterized in that, The adjustment shims are provided in multiples, and at least two of the adjustment shims have different thicknesses.

7. The injector according to claim 5, characterized in that, The adjusting shim is located between the valve seat and the tightening cap, with one side of the adjusting shim contacting the valve seat and the other side of the adjusting shim contacting the tightening cap.

8. The injector according to claim 5, characterized in that, The adjusting shim is located between the intermediate body and the needle valve, and one side of the adjusting shim is in contact with the needle valve.

9. The injector according to claim 1, characterized in that, It also includes an elastic element, at least a portion of which is located in the cavity, and the elastic element is connected to the needle valve.

10. An engine, characterized in that, It includes the injector and cylinder as described in any one of claims 1-9, wherein the injector is disposed in the cylinder.

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