Liquid injection valve seat, oil injector and fuel oil engine

Abstract

The utility model relates to the technical field of fuel injectors, in particular to a liquid injection valve seat, a fuel injector and a fuel engine. The liquid spraying valve seat comprises a body, a cavity with one open end is formed in the body, and the cavity is internally provided with a guiding face, a liquid spraying face and a liquid spraying face. The flow channel is concavely arranged in the direction away from the rotation axis of the liquid spraying valve seat relative to the guide surface; the annular sealing surface is arranged at one end far away from the opening of the cavity; the spraying hole is formed in an area enclosed by the annular sealing surface; the guide face, the annular sealing face and the side face of the flow channel are all parts of rotation faces, and the axis of each rotation face is parallel to the direction of the rotation axis of the liquid spraying valve seat. The liquid spraying valve seat can be machined and formed without the help of a mold, the degree of freedom is high, the number of machining steps is relatively small, machining is easy, and the requirements for the working environment and the spraying precision of the liquid spraying valve seat can be met.

Description

Technical Field

[0001] The utility model relates to the technical field of fuel injectors, in particular to a liquid injection valve seat, a fuel injector and a fuel engine. Background Art

[0002] The high-pressure fuel injector is one of the important parts in modern fuel direct injection engines. It can accurately supply the fuel required by the fuel engine under various working conditions, and fully atomize the fuel to form a good combustible mixture. Its working performance has a vital impact on the power performance and emissions of the engine. The high-pressure fuel injector is composed of multiple components, including a needle valve, a valve seat and a valve sleeve connected to the valve seat. In order to better limit the movement of the needle valve and ensure the sealing of the injector when it is closed, a guide rib is generally provided on the inner wall of the valve seat of the injector to guide the movement of the needle valve. The guide rib is a convex structure, and the concave structure between adjacent guide ribs is a flow channel, which is a channel for the flow of fuel. The needle valve reciprocates along the axial direction of the valve sleeve under the guidance of the guide rib to realize the opening and closing of the injector. When the bottom outer wall of the needle valve is separated from the bottom seal of the valve seat, the injector is in an open state, and the fuel can reach the spray hole through the flow channel and spray the fuel to the outside world from the spray hole. When the needle valve contacts the bottom seal of the valve seat, the injector is in a closed state.

[0003] Due to the existence of two complex structures, namely the flow channel and the guide rib, in the current mass production of the valve seat, the main body is generally produced by metal injection molding, that is, injecting metal powder and adhesive into the mold, and the spray hole is processed by laser drilling. The metal injection molding process is relatively complex. First, it has high requirements on raw materials, and it is necessary to strictly control the selection of metal powder and the proportion of adhesive. Second, it has high requirements on processing technology, and the control of temperature, pressure and time in the removal of adhesive and sintering process is more stringent. Third, the valve seat of metal injection molding is sintered by metal powder, and there are certain pores inside the valve seat, which makes the mechanical properties of the valve seat lower than those of the same type of refined steel. In addition, the compatibility of the mold used for injection molding is low. However, based on the working environment of the injector valve seat and the requirements of injection accuracy, the valve seat needs to have high dimensional accuracy, corrosion resistance, temperature resistance and wear resistance. Therefore, the technical barriers and costs of the existing valve seat processing and production using the metal injection molding process are relatively high, and further optimization is needed. Utility Model Content

[0004] In view of the above shortcomings of the prior art, the purpose of the utility model is to provide a liquid injection valve seat, a fuel injector and a fuel engine, which can reduce the processing steps of the liquid injection valve seat, reduce the processing cost, and improve the comprehensive working performance of the liquid injection valve seat.

[0005] To achieve the above-mentioned purpose and other related purposes, the utility model provides a liquid spray valve seat, including a body, a cavity with an open end formed in the body, and a guide surface is arranged in the cavity;

[0006] The flow channel is recessed relative to the guide surface in a direction away from the rotation axis of the liquid injection valve seat;

[0007] An annular sealing surface is arranged at an end away from the opening of the cavity;

[0008] A spray hole is arranged in the area enclosed by the annular sealing surface;

[0009] The guide surface, the annular sealing surface and the side surface of the flow channel are all part of the revolving surface, and the axis of each revolving surface is parallel to the revolving axis direction of the liquid injection valve seat.

[0010] As one of the embodiments of the present case, at least two guide surfaces are provided above the annular sealing surface, and the flow channel is formed on the inner wall of the cavity between two adjacent guide surfaces.

[0011] As one of the embodiments of the present case, it is characterized in that the guide surface and the annular sealing surface are connected via a first connecting surface, and the first connecting surface is a part of the revolving surface.

[0012] As one of the embodiments of this case, it is characterized in that the flow channel includes:

[0013] A first wall surface, the first wall surface located between two adjacent guide surfaces being a part of a revolving surface;

[0014] A second connecting surface, one end of the second connecting surface is connected to the first wall surface, the other end of the second connecting surface is connected to the first connecting surface, and the second connecting surface is a part of the revolving surface.

[0015] As one of the embodiments of the present case, the first connecting surface and the guide surface, the first connecting surface and the edge of the annular sealing surface, the second connecting surface and the first wall surface, and the second connecting surface and the first connecting surface are all smoothly connected.

[0016] As one of the embodiments of the present case, the first connecting surface is tangent to the guide surface; the second connecting surface is tangent to the first wall surface; and the second connecting surface is tangent to the first connecting surface.

[0017] As one of the embodiments of the present case, the first connecting surface is a single or multiple tangent spherical surfaces; the second connecting surface is a single spherical surface or a combination of multiple spherical surfaces or a parabolic structure.

[0018] As one of the embodiments of the present case, the annular sealing surface is formed in a curved or spherical shape protruding toward the rotation axis direction of the liquid injection valve seat.

[0019] To achieve the above-mentioned purpose and other related purposes, the utility model provides a fuel injector, comprising: a needle valve;

[0020] The inlet part is the entrance for the fuel to be input into the fuel injector;

[0021] a conveying portion, communicating with the inlet portion, and

[0022] The above-mentioned liquid injection valve seat communicated with the delivery portion, wherein:

[0023] The delivery portion is used to deliver the fuel input from the inlet portion to the injection valve seat; when the bottom of the needle valve is out of contact with the annular sealing surface of the injection valve seat, the injection valve seat is configured to be able to deliver the fuel delivered by the delivery portion to the spray hole through the flow channel, and spray it to the outside through the spray hole.

[0024] In order to achieve the above-mentioned object and other related objects, the utility model provides a fuel engine, including the above-mentioned fuel injector.

[0025] To summarize, the utility model sets the guide surface, the annular sealing surface, and the side surface of the flow channel as part of the rotating surface, and makes the axis of each rotating surface parallel to the direction of the rotating axis of the valve seat, so that the cavity of the liquid spray valve seat can be easily machined, such as by a milling cutter or a customized molding knife adapted to the rotating surface of the inner surface of the cavity. Compared with the liquid spray valve seat processed by metal injection molding, the liquid spray valve seat is processed by mechanical processing, which does not require the aid of a mold and has a high degree of freedom; there is no need to perform processes such as degreasing and sintering, and the processing steps are relatively few, and the processing is relatively easy; compared with the material of metal injection molding which is sintered from metal powder, the steel used in the mechanical processing process has higher mechanical properties and can meet the working environment and injection accuracy requirements of the liquid spray valve seat, and the mechanical processing process has low technical barriers and low processing costs, which is conducive to the mass production of liquid sprayers. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0027] Figure 1 This is a schematic diagram of the structure of the liquid spray valve seat involved in the utility model;

[0028] Figure 2 This is a schematic diagram of the structure of the needle valve involved in the utility model located in the liquid injection valve seat;

[0029] Figure 3 This is a schematic diagram of the overall structure of the fuel injector involved in the utility model;

[0030] Figure 4 for Figure 3 A local enlarged view of point A;

[0031] Figure 5 This is a cross-sectional view of the liquid injection valve seat before improvement of the utility model;

[0032] Figure 6 This is a top view of the liquid injection valve seat before improvement of the utility model;

[0033] Figure 7 for Figure 2 A top view of

[0034] Figure 8 The change in the cross-sectional area of ​​the flow channel after the liquid sprayer of the utility model is opened;

[0035] Fig. 9 This is a pressure cloud diagram of the flow field in the liquid spray valve seat after the liquid sprayer of the utility model is opened;

[0036] Explanation of component numbers: main body 1, cavity 11, guide rib 110, guide surface 111, flow channel 112, first wall surface 1121, second connecting surface 1122, annular sealing surface 113, spray hole 114, first connecting surface 115, needle valve 2, valve stem 21, valve ball 22, inlet portion 3, conveying portion 4, inner support rod 41, valve sleeve 42. DETAILED DESCRIPTION

[0037] The following describes the implementation of the present invention through specific examples, and those skilled in the art can easily understand other advantages and effects of the present invention from the contents disclosed in this specification. The present invention can also be implemented or applied through other different specific implementations, and the details in this specification can also be modified or changed in various ways based on different viewpoints and applications without departing from the spirit of the present invention. It should be noted that the following embodiments and the features in the embodiments can be combined with each other without conflict. It should also be understood that the terms used in the embodiments of the present invention are intended to describe specific implementation schemes, rather than to limit the scope of protection of the present invention. The test methods for which specific conditions are not specified in the following examples are usually carried out under conventional conditions or under the conditions recommended by the manufacturers.

[0038] See also Figures 1 to 9. It should be noted that the structures, proportions, sizes, etc. illustrated in the drawings of this specification are only used to match the contents disclosed in the specification for people familiar with this technology to understand and read, and are not used to limit the limiting conditions for the implementation of the utility model, so they have no substantial technical significance. Any modification of the structure, change in the proportional relationship, or adjustment of the size, without affecting the effects and purposes that can be achieved by the utility model, should still fall within the scope of the technical content disclosed by the utility model. At the same time, the terms such as "upper", "lower", "left", "right", "middle" and "one" quoted in this specification are only for the convenience of description, and are not used to limit the scope of the implementation of the utility model. Changes or adjustments in their relative relationships should also be regarded as the scope of the implementation of the utility model without substantially changing the technical content.

[0039] When numerical ranges are given in the embodiments, it should be understood that unless otherwise specified in the present invention, both endpoints of each numerical range and any value between the two endpoints can be selected. Unless otherwise defined, all technical and scientific terms used in the present invention are in accordance with the prior art mastery of those skilled in the art and the description of the present invention, and any prior art methods, equipment and materials similar or equivalent to the methods, equipment and materials in the embodiments of the present invention can also be used to implement the present invention.

[0040] See also Figure 1 The utility model provides a liquid spray valve seat, comprising a body 1, wherein a cavity 11 with an open end is formed in the body 1, and the cavity 11 is provided with: a guide surface 111;

[0041] The flow channel 112 is recessed relative to the guide surface 111 and is arranged in a direction away from the rotation axis of the liquid injection valve seat;

[0042] An annular sealing surface 113 is provided at an end away from the opening of the cavity 11;

[0043] The spray hole 114 is arranged in the area enclosed by the annular sealing surface 113;

[0044] The guide surface 111 , the annular sealing surface 113 and the side surface of the flow channel 112 are all part of the revolving surface, and the axis of each revolving surface is parallel to the revolving axis of the liquid injection valve seat.

[0045] Please note that Figure 1-4 ,in, Figure 1 and Figure 2The dotted line in is the rotation axis of the liquid spray valve seat; the liquid spray valve seat is a component used in conjunction with the needle valve 2, and both are part of the liquid sprayer; the needle valve 2 includes a valve stem 21 and a valve ball 22 arranged at one end of the valve stem 21, and the valve ball 22 can reciprocate in the cavity 11 of the liquid spray valve seat to realize the opening and closing of the spray hole 114 and to spray the liquid in the liquid sprayer to the outside. According to the size, number, arrangement position, direction, shape and other parameters of the spray hole 114, a liquid spray with a specific shape and injection rate can be formed, such as Figure 3-4 As shown, the fuel injection function of the fuel injector in the fuel engine is realized; the spray hole 114 is located on the bottom surface of the cavity 11 below the annular sealing surface 113; the inner wall of the cavity 11 is also provided with a guide rib 110, and the guide surface 111 is provided on the guide rib 110. The guide rib 110 is used to guide the needle valve 2 when it moves up and down in the cavity 11. The guide surface 111 on the guide rib 110 contacts the surface of the valve ball 22 when guiding the needle valve 2; the flow channel 112 is located on the inner wall of the cavity 11, and is located between the inner wall of the cavity 11 and the valve ball 22. Between the outer walls of the needle valve 2, the flow channel 112 is used for liquid to flow from the open end of the spray valve seat to the spray hole 114. The direction of the flow channel 112 is parallel to the central axis direction of the sprayer. The guide surface 111 is a surface protruding outward relative to the flow channel 112. The valve ball 22 at the lower part of the needle valve 2 can contact the guide surface 111. The guide surface 111 is configured to guide the needle valve 2 to reciprocate in the cavity 11, so that the needle valve 2 contacts and seals with the annular sealing surface 113 or separates to realize the opening and closing of the spray hole 114, thereby realizing the spraying function of the sprayer.

[0046] See also Figure 5-6 Since the guide ribs 110 and the flow channel 112 in the existing liquid injection valve seat have complex structures, such as the several surfaces forming the flow channel 112 and the guide ribs 110 are plane or irregular surfaces, and the joints of the several surfaces are sharp, they cannot be formed by mechanical processing. Therefore, the general mass production of liquid injection valve seats can only be carried out by metal injection molding, which is not only complex but also has many defects; therefore, please refer to Figure 1-2Under the premise of not changing the normal use function of the liquid spray valve seat, through improvement, the guide surface 111, the annular sealing surface 113, and the side of the flow channel 112 are all set as part of the rotating surface, and the axis of each rotating surface is parallel to the direction of the rotating axis of the liquid spray valve seat, so that the cavity 11 of the liquid spray valve seat can be easily machined, such as machining the liquid spray valve seat by a milling cutter or a customized molding knife adapted to the rotating surface of the inner surface of the cavity 11. Compared with the liquid spray valve seat processed by metal injection molding, the liquid spray valve seat is processed by mechanical machining, which does not require the aid of a mold and has a high degree of freedom; there is no need to perform processes such as degreasing and sintering, the processing steps are relatively few, and the processing is relatively easy; compared with the material of metal injection molding, which is sintered from metal powder, the mechanical properties of the steel used in the mechanical machining process are higher, which can meet the working environment and injection accuracy requirements of the liquid spray valve seat, and the technical barriers and processing costs of the mechanical machining process are low, which is conducive to the mass production of liquid sprayers.

[0047] Furthermore, the liquid injection valve seat may also be processed by precision electrochemical machining.

[0048] See also Figure 1-2 Furthermore, the annular sealing surface 113 is a revolving surface with a step, so that the sealing performance at the annular sealing surface 113 can be improved.

[0049] The specific machining process steps are as follows: the cavity 11 in the liquid injection valve seat is processed by a machining process. First, a forming cutter is used to turn out a barrel-shaped guide surface 111, a first connecting surface 115, an annular sealing surface 113, and the bottom surface of the cavity 11 below the annular sealing surface 113; then a milling cutter corresponding to the shape of the second connecting surface 1122 is used to turn out the flow channel 112, thereby completing the mechanical processing of the cavity 11 in the liquid injection valve seat.

[0050] See also Figure 1-2 As one of the embodiments of the present case, at least two guide surfaces 111 are provided above the annular sealing surface 113 , and the flow channel 112 is formed on the inner wall of the cavity 11 between two adjacent guide surfaces 111 .

[0051] It should be noted that the guide surface 111 is arranged above the annular sealing surface 113, so that the guide surface 111 will not affect the sealing effect of the annular sealing surface 113. If the flow channel 112 is arranged away from the guide surface 111, the flow channel 112 needs to be processed separately after the guide surface 111 is processed, and the processing steps will increase, which increases the processing cost. However, by providing at least two guide surfaces 111, the accuracy of the guide surface 111 in guiding the movement of the valve ball 22 is improved, and the sealing performance of the valve ball 22 when it cooperates with the annular sealing surface 113 is improved. By forming the flow channel 112 between the two guide surfaces 111, the flow channel 112 can be processed at the same time as the two guide surfaces 111 are processed, thereby reducing the machining steps.

[0052] See also Figure 7 As one of the embodiments of the present case, four or five guiding surfaces 111 are evenly arranged in the cavity 11, and the flow channel 112 is located between two adjacent guiding surfaces 111. The number of the flow channels 112 corresponds to the number of the guiding surfaces 111, so as to improve the spraying effect of the sprayer.

[0053] See also Figure 1-2 7. As one of the embodiments of the present case, the guide surface 111 and the annular sealing surface 113 are connected via a first connecting surface 115, and the first connecting surface 115 is a part of the revolving surface.

[0054] It should be noted that by making the first connecting surface 115 between the guide surface 111 and the annular sealing surface 113 a part of the revolving surface, the machining between the guide surface 111 and the annular sealing surface 113 is facilitated, which is beneficial to the molding of the liquid injection valve seat.

[0055] See also Figure 1-2 7. As one embodiment of the present invention, the flow channel 112 includes:

[0056] A first wall surface 1121, the first wall surface 1121 located between two adjacent guide surfaces 111, is a part of a revolving surface;

[0057] The second connecting surface 1122 has one end connected to the first wall surface 1121 , and the other end connected to the first connecting surface 115 , and the second connecting surface 1122 is a part of the revolving surface.

[0058] It should be noted that by making the flow channel 112 and the second connecting surface 1122 between the flow channel 112 and the first connecting surface 115 part of the revolving surface, the mechanical processing of the entire flow channel 112 is facilitated, which is further beneficial to the processing and forming of the liquid injection valve seat.

[0059] See also Figure 1-2 7. As one of the embodiments of the present case, the axes of the rotating surfaces of the guide surface 111 and / or the first connecting surface 115 and / or the annular sealing surface 113 and / or the bottom surface of the cavity 11 below the annular sealing surface 113 are coaxially arranged, thereby facilitating the machining of the guide surface 111, the first connecting surface 115, the annular sealing surface 113, and the bottom surface of the cavity 11 below the annular sealing surface 113, and improving the machining efficiency.

[0060] See also Figure 1-2 7. As one of the embodiments of the present case, the first connecting surface 115 and the guide surface 111, the first connecting surface 115 and the edge of the annular sealing surface 113, the second connecting surface 1122 and the first wall surface 1121, and the second connecting surface 1122 and the first connecting surface 115 are all smoothly connected.

[0061] It should be noted that the injection pressure of a general high-pressure fuel injector is between 10MPa and 35MPa. When the fuel flows in the flow channel 112, once the cross-sectional area of ​​the flow channel 112 changes suddenly or the cross-sectional area is a convex structure, severe turbulence is easily generated, which makes the flow of the fuel more disturbed and unstable, thereby affecting the injection performance of the fuel. Therefore, by making each surface in the cavity 11 smoothly connected, such as Figure 8 As shown, when the injector is turned on, the cross-sectional area of ​​the fuel flowing along the flow channel 112 changes smoothly without a sudden change point, such as Fig. 9 As shown, this will make the pressure of the fuel inside the injector relatively stable and gentle during high-pressure fuel injection, thereby making the flow stability of the fuel inside the injection valve seat in the flow channel 112 high, which can effectively improve the accuracy of the fuel injection amount and the stability of the fuel injection position and spray shape, and help improve the stability and consistency of fuel engine combustion.

[0062] See also Figure 1-2 As one of the embodiments of the present case, the first connecting surface 115 and the edge of the annular sealing surface 113 are connected by an arc chamfer, thereby improving the smoothness of the connection between the first connecting surface 115 and the annular sealing surface 113, which is beneficial to improving the accuracy of the fuel injection amount and the stability of the fuel injection position and spray shape, thereby improving the comprehensive performance of the injector.

[0063] See also Figure 1-2 7. As one of the embodiments of the present case, the first connecting surface 115 is tangent to the guide surface 111 ; the second connecting surface 1122 is tangent to the first wall surface 1121 ; the second connecting surface 1122 is tangent to the first connecting surface 115 .

[0064] It should be noted that by making the various surfaces in the cavity 11 tangentially connected, the smoothness between the various surfaces in the cavity 11 can be further improved, thereby further improving the flow stability of the fuel in the flow channel 112, thereby improving the stability and consistency of the fuel engine combustion.

[0065] See also Figure 1-2 7. As one of the embodiments of the present case, the first connecting surface 115 is a single or multiple tangent spherical surfaces; the second connecting surface 1122 is a single spherical surface or a combination of multiple spherical surfaces or a parabolic structure.

[0066] It should be noted that the spherical surface or the parabolic surface is a revolving surface that is easy to machine, so that the first connecting surface 115 and the second connecting surface 1122 can be easily machined, which is beneficial to reducing the processing cost of the liquid injection valve seat.

[0067] See also Figure 1-2 7. As one of the embodiments of the present case, the first wall surface 1121 is a cylindrical wall surface. The flow channel 112 structure formed by the tangential connection between the second connecting surface 1122 of a spherical or parabolic structure and the first wall surface 1121 and the first connecting surface 115 can significantly improve the stability of fuel injection, thereby effectively improving the accuracy of the fuel injection amount and the stability of the fuel injection position and spray shape, thereby improving the performance of the entire injector.

[0068] See also Figure 1-2 As one of the embodiments of the present case, the annular sealing surface 113 is formed into a curved surface or a spherical surface protruding toward the rotation axis direction of the liquid injection valve seat.

[0069] It should be noted that the annular sealing surface 113 is formed into a curved or spherical shape protruding toward the rotation axis direction of the liquid injection valve seat to cooperate with the valve ball 22 to fit the annular sealing surface 113, thereby improving the sealing performance of the annular sealing surface 113.

[0070] See also Figure 1-4 , the utility model also provides a fuel injector, comprising: a needle valve 2;

[0071] Inlet 3 is the inlet for inputting fuel into the fuel injector;

[0072] a conveying portion 4, connected to the inlet portion 3, and

[0073] The above-mentioned liquid injection valve seat communicated with the delivery part 4, wherein:

[0074] The delivery portion 4 is used to deliver the fuel input from the inlet portion 3 to the injection valve seat; when the bottom of the needle valve 2 is out of contact with the annular sealing surface 113 of the injection valve seat, the injection valve seat is configured to be able to deliver the fuel delivered by the delivery portion 4 to the spray hole 114 through the flow channel 112, and spray it to the outside through the spray hole 114.

[0075] It should be noted that the needle valve 2 includes a valve stem 21 and a valve ball 22 connected to one end of the valve stem 21, a valve sleeve 42 is welded to the open end of the liquid injection valve seat, and the upper end of the valve sleeve 42 is also sequentially provided with an inner support rod 41 and a sleeve, the inlet portion 3 can be any structure for inputting fuel into the injector, such as a sleeve; the delivery portion 4 can be any structure for delivering the fuel input from the inlet portion 3 to the liquid injection valve seat, such as an inner support rod 41 and a valve sleeve 42 or a fuel guide pipe, the valve ball 22, driven by the needle valve 2, reciprocates along the axial direction of the valve sleeve 42 under the guidance of the guide surface 111 to realize the opening and closing of the injector; when the outer wall of the valve ball 22 is separated from the annular sealing surface 113 at the bottom of the liquid injection valve seat, the injector is in In the open state; when the outer wall of the valve ball 22 contacts the annular sealing surface 113 at the bottom of the injection valve seat, the injector is in the closed state; when the injector is opened, the fuel flows into the injector through the inlet portion 3, passes through the inner support rod 41 and reaches the valve sleeve 42. At this time, the outer wall of the valve ball 22 and the annular sealing surface 113 at the bottom of the injection valve seat are separated from each other. After the fuel flows into the flow channel 112, it flows from the gap between the annular sealing surface 113 of the injection valve seat and the outer wall of the valve ball 22 to the spray hole 114, and then is sprayed out through the spray hole 114; when the outer wall of the valve ball 22 contacts the annular sealing surface 113 at the bottom of the injection valve seat, the fuel in the flow channel 112 cannot flow to the spray hole 114, and the fuel is sealed inside the injector, thereby realizing the closure of the injector;

[0076] Since the cavity 11 of the injection valve seat can be machined, the processing technology barriers and processing costs of the injector can be reduced, which is conducive to the mass production of the injector; since the first wall surface 1121, the first connecting surface 115 and the second connecting surface 1122 of the injection valve seat are smoothly connected, the stability of the fuel injection can be significantly improved, and the accuracy of the fuel injection amount and the stability of the fuel injection position and the spray shape can be effectively improved, thereby improving the performance of the entire injector.

[0077] See also Figure 1-4 The utility model also provides a fuel engine, including the above-mentioned fuel injector.

[0078] It should be noted that whether it is a fuel generator or a fuel engine, an injector is generally required. By using the injector of this case, on the one hand, the processing technology barriers and processing costs of the fuel generator or fuel engine can be reduced, and on the other hand, the stability of the fuel flow in the injector can be improved, thereby effectively improving the accuracy of the fuel injection amount and the stability of the fuel injection position and spray shape, thereby improving the performance of the entire fuel engine.

[0079] In summary, the utility model effectively overcomes some practical problems in the prior art and thus has high utilization value and use significance.

[0080] The above embodiments are merely illustrative of the principles and effects of the present invention, and are not intended to limit the present invention. Anyone familiar with the technology may modify or alter the above embodiments without departing from the spirit and scope of the present invention. Therefore, all equivalent modifications or alterations made by a person of ordinary skill in the art without departing from the spirit and technical concept disclosed in the present invention shall still be covered by the claims of the present invention.

Claims

1. A liquid injection valve seat, characterized in that: The invention comprises a main body, wherein a cavity having an open end is formed in the main body, and the cavity is provided with: Guide surface; The flow channel is recessed relative to the guide surface in a direction away from the rotation axis of the liquid injection valve seat; An annular sealing surface is arranged at an end away from the opening of the cavity; A spray hole is arranged in the area enclosed by the annular sealing surface; The guide surface, the annular sealing surface and the side surface of the flow channel are all part of the revolving surface, and the axis of each revolving surface is parallel to the revolving axis direction of the liquid injection valve seat.

2. A liquid spray valve seat according to claim 1, characterized in that: At least two guide surfaces are provided above the annular sealing surface, and the flow channel is formed on the inner wall of the cavity between two adjacent guide surfaces.

3. A liquid spray valve seat according to claim 2, characterized in that: The guide surface is connected to the annular sealing surface via a first connecting surface, and the first connecting surface is a part of the revolving surface.

4. A liquid spray valve seat according to claim 3, characterized in that: The flow channel comprises: A first wall surface, the first wall surface located between two adjacent guide surfaces being a part of a revolving surface; The second connecting surface has one end connected to the first wall surface and the other end connected to the first connecting surface, and the second connecting surface is a part of the revolving surface.

5. A liquid spray valve seat according to claim 4, characterized in that: The first connecting surface and the guide surface, the first connecting surface and the edge of the annular sealing surface, the second connecting surface and the first wall surface, and the second connecting surface and the first connecting surface are all smoothly connected.

6. A liquid spray valve seat according to claim 4, characterized in that: The first connecting surface is tangent to the guide surface; the second connecting surface is tangent to the first wall surface; and the second connecting surface is tangent to the first connecting surface.

7. A liquid spray valve seat according to claim 6, characterized in that: The first connecting surface is a single or multiple tangent spherical surfaces; the second connecting surface is a single spherical surface or a combination of multiple spherical surfaces or a parabolic structure.

8. A liquid spray valve seat according to claim 1, characterized in that: The annular sealing surface is formed in a curved surface or a spherical surface protruding toward the rotation axis direction of the liquid injection valve seat.

9. A fuel injector, characterized in that: include: Needle valve; The inlet part is the entrance for the fuel to be input into the fuel injector; a conveying portion, communicating with the inlet portion, and The liquid injection valve seat according to any one of claims 1 to 8, which is connected to the delivery portion, The delivery portion is used to deliver the fuel input from the inlet portion to the injection valve seat; when the bottom of the needle valve is out of contact with the annular sealing surface of the injection valve seat, the injection valve seat is configured to be able to deliver the fuel delivered by the delivery portion to the spray hole through the flow channel, and spray it to the outside from the spray hole.

10. A fuel engine, characterized in that: Including the fuel injector as claimed in claim 9.

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