armatures, solenoid valves, injectors, engines and motor vehicles

Abstract

The present disclosure provides a armature, an electromagnetic valve, an oil injector, an engine and a power vehicle. The armature comprises a guide portion extending in a first direction, and a tail portion located at one end of the guide portion and extending in a second direction perpendicular to the first direction, wherein: the size of the tail portion in the second direction is greater than the size of the guide portion in the second direction; the guide portion is adapted to be slidingly fitted with a guide hole provided on the electromagnetic valve; and the side of the tail portion away from the guide portion is adapted to apply a force to a corresponding sealing component. The embodiments of the present disclosure can reduce the axial size and radial size of the electromagnetic valve.

Description

TECHNICAL FIELD

[0001] The present disclosure relates to the technical field of engines, and in particular to an armature, an electromagnetic valve, an oil injector, an engine, and a power vehicle. BACKGROUND

[0002] The high-pressure common rail electronic injection technology refers to a fuel supply mode in which the generation of injection pressure and the injection process are completely separated from each other in a closed loop system composed of a high-pressure oil pump, a pressure sensor, and an electronic control unit (ECU). It is a fuel supply mode in which high-pressure fuel is delivered by a high-pressure oil pump to a common fuel supply pipe, and the injection process is precisely controlled by the oil pressure in the common fuel supply pipe, so that the high-pressure pipe pressure is independent of the engine speed, and the degree of change of the diesel engine fuel supply pressure with the engine speed can be greatly reduced.

[0003] The oil injector is a key component in the high-pressure common rail system. By controlling the opening and closing of the oil injector, individual injection of each cylinder can be achieved.

[0004] The opening and closing state of the oil injector is mainly realized by an electromagnetic valve. The existing electromagnetic valve has a demand for further improvement in size and cost.

[0005] Therefore, it is necessary to propose a new technical scheme to solve at least one of the above technical problems. SUMMARY

[0006] In order to overcome at least one aspect of the technical problems in the prior art, the present disclosure is proposed.

[0007] According to one aspect of an embodiment of the present disclosure, an armature is provided, comprising: a guide portion extending in a first direction; a tail portion located at one end of the guide portion and extending in a second direction perpendicular to the first direction, wherein: the size of the tail portion in the second direction is greater than the size of the guide portion in the second direction; the guide portion is adapted to be in sliding fit with a guide hole provided on an electromagnetic valve; and the side of the tail portion away from the guide portion is adapted to apply a force to a sealing member corresponding thereto.

[0008] According to another aspect of an embodiment of the present disclosure, an electromagnetic valve is provided, comprising an electromagnetic valve body and the aforementioned armature, the electromagnetic valve body being provided with a guide hole, and the guide portion of the armature being in sliding fit with the guide hole.

[0009] According to another aspect of an embodiment of the present disclosure, an oil injector is provided, comprising the aforementioned electromagnetic valve and a sealing member, and the tail portion of the armature of the electromagnetic valve being adapted to apply a force to the sealing member.

[0010] According to another aspect of an embodiment of the present disclosure, an engine is provided, comprising the aforementioned oil injector.

[0011] According to another aspect of embodiments of the present disclosure, there is provided a power vehicle comprising the aforementioned engine. BRIEF DESCRIPTION OF DRAWINGS

[0012] The above and other aspects and features of the present disclosure will become apparent from the following description of embodiments, taken in conjunction with the accompanying drawings, which show, by way of example, the principles of the present disclosure.

[0013] Figure 1 is a sectional view of a known electromagnetic valve;

[0014] Figure 2 is a sectional view of an electromagnetic valve and parts cooperating therewith according to one embodiment of the present disclosure;

[0015] Figure 3 is Figure 2 is a sectional view of the electromagnetic valve and parts cooperating therewith in Fig. 1 from another perspective;

[0016] Figure 4 shows the state of parts of the electromagnetic valve in energized and de-energized states;

[0017] Figure 5 is a schematic view of an armature according to one embodiment of the present disclosure;

[0018] Figure 6 is a schematic view of an armature and sealing parts according to another embodiment of the present disclosure;

[0019] Figure 7 is an exploded schematic view of an electromagnetic valve body according to one embodiment of the present disclosure.

[0020] In the drawings: 11, electromagnetic valve body; 12, coil; 13, armature; 14, valve needle; 100, armature; 110, guide portion; 120, tail portion; 200, electromagnetic valve body; 210, guide hole; 211, spring; 220, adjusting washer; 230, pole shoe; 240, needle foot support; 250, skeleton; 260, coil; 270, housing, 280, plastic material; 290, accommodating cavity; 300, oil return hole; 320, support ring; 330, orifice valve; 331, oil passage; 340, sealing parts. DETAILED DESCRIPTION

[0021] The following description of embodiments of the present disclosure with reference to the accompanying drawings is intended to explain the general inventive concept of the present disclosure and is not to be understood as a limitation of the present disclosure. All other embodiments that can be derived by those skilled in the art from the embodiments disclosed in the present disclosure fall within the scope of the present disclosure.

[0022] Figure 1 is a sectional view of a known electromagnetic valve. As Figure 1As shown, the electromagnetic valve includes an electromagnetic valve body 11, an armature 13, and a valve needle 14. The armature 13 and the valve needle 14 are in a split structure and are fixedly connected. The valve needle 14 extends in a vertical direction and is located in a vertically arranged guide sleeve (not shown in the figure), and the two are in sliding fit, guiding the valve needle 14 and the armature 13 to move in the vertical direction. The electromagnetic valve body 11 includes a coil 12. When the coil 12 is de-energized, no magnetic force is generated, and the armature 13 is spaced apart from the lower end surface of the electromagnetic valve body 11 under the downward resistance of a spring (not shown) in the electromagnetic valve body 11. When the coil 12 is energized, a magnetic force is generated, attracting the armature 13 to move upward, so that the armature 13 contacts the lower end surface of the electromagnetic valve body 11 (i.e. Figure 1 The position state shown in the figure). It is easy to understand that by controlling the on-off state of the coil 12, the position state of the armature 13 and the valve needle 14 can be changed, and then the injection state of the injector can be controlled.

[0023] Figure 1 As shown in the electromagnetic valve, the guide structure of the armature 13 is located outside the electromagnetic valve body 11, which causes the electromagnetic valve to have a large axial size, and then causes the injector to have a large axial size.

[0024] Figure 2 is a cross-sectional view of an electromagnetic valve according to an embodiment of the present disclosure. Figure 3 is Figure 2 is a cross-sectional view of the electromagnetic valve in Figure 3 and Figure 2 The observation angles in

[0025] Referring to Figure 2 , Figure 3 and Figure 5 , an embodiment of the present disclosure provides an armature 100. The armature 100 includes a guide portion 110 and a tail portion 120. The guide portion 110 extends in a first direction (for example, a vertical direction in Figure 2 . The tail portion 120 extends in a second direction (for example, a horizontal direction in the figure). As shown in Figure 2 and Figure 3 , the tail portion 120 is located at the lower end of the guide portion 110. The size of the tail portion 120 in the second direction (for example, the horizontal direction in Figure 2 ) is greater than the size of the guide portion 110 in the second direction (for example, the horizontal direction in Figure 2 ).

[0026] As shown in Figure 2 and Figure 3 , the electromagnetic valve body 200 is provided with a guide hole 210. The guide portion 110 can be located in the guide hole 210 and in sliding fit with the guide hole 210, to guide the movement of the armature 100 as a whole in the first direction or the vertical direction.

[0027] As shown in Figure 2 , Figure 3 and Figure 5 , the surface of the tail portion 120 on the side away from the guide portion 110 of the armature 100 (e.g. the lower surface in Figure 2 , Figure 3 and Figure 5 ) can apply a pressing force in the first direction to the sealing member 340, thereby controlling the opening or closing of the oil passage 331 in the orifice valve 330.

[0028] In the present disclosure, a component extending in a certain direction can mean that the dimension of the component in the direction is greater than the dimension of the component in other directions.

[0029] In the present disclosure, the second direction is perpendicular to the first direction. The second direction can not be only one direction, but include multiple directions in the same plane, and accordingly, the tail portion 120 can extend in each direction in the plane. Exemplarily, the projection of the tail portion 120 in the first direction can be circular.

[0030] In the embodiments of the present disclosure, the guide portion 110 of the armature 100 can be arranged in the guide hole 210 of the electromagnetic valve body 200, without the need to additionally arrange a guide structure outside the electromagnetic valve body 200, which is advantageous to reduce the axial dimension (i.e. the dimension along the first direction in the figure) of the electromagnetic valve. By reducing the axial dimension of the electromagnetic valve, the manufacturing cost of the electromagnetic valve can be reduced.

[0031] For the electromagnetic valve in Figure 1 , the lower end surface of the valve needle 14 is used to apply a force to the sealing member (not shown). In the embodiments of the present disclosure, the lower surface of the tail portion 120 is used to apply a force to the sealing member 340. In the case that the radial dimension of the valve needle 14 in Figure 1 is close to the radial dimension of the guide portion 110 in the embodiments of the present disclosure, since the dimension of the tail portion 120 in the second direction in the figure (i.e. the maximum horizontal dimension of the cross section of the tail portion 120) in the embodiments of the present disclosure is greater than the dimension of the guide portion 110 in the second direction in the figure (i.e. the maximum horizontal dimension of the cross section of the guide portion 110), the embodiments of the present disclosure can provide a larger surface area for applying a force to the sealing member, without the need that the cross sectional dimension of the guide portion 110 in the second direction in the figure is greater than the cross sectional dimension of the sealing member. In this way, in the case that the required surface area of the sealing member is certain, the embodiments of the present disclosure allow the guide portion 110 to have a smaller horizontal dimension, which is advantageous to reduce the radial dimension (i.e. the dimension along the second direction in the figure) of the electromagnetic valve. By reducing the radial dimension of the electromagnetic valve, the manufacturing cost of the electromagnetic valve can be reduced.

[0032] In an alternative embodiment, the tail portion 120 and the guide portion 110 are integrally formed. With the integrally formed structure, the mounting connection (e.g. press fitting and welding) process of the split structure can be eliminated, and the processing is facilitated, and the processing time and cost can be saved. As can be appreciated by those skilled in the art, the tail portion 120 and the guide portion 110 can also be split structures, and then assembled together through mounting connection.

[0033] In an alternative embodiment, as shown in Figure 2 , Figure 3 and Figure 5 the side (e.g. the lower side in the figure) of the tail portion 120 away from the guide portion 110 is provided with a receiving cavity 290. The sealing member 340 is at least partially located in the receiving cavity 290. The inner surface of the receiving cavity 290 can contact and press down the sealing member 340, so as to apply a force to the sealing member 340. In the embodiment of the present disclosure, the lower side of the tail portion 120 is provided with a recessed receiving cavity. In other alternative embodiments, the lower side of the tail portion 120 can also be a flat surface, or other recessed shapes, etc. Those skilled in the art can set the shape of the lower side of the tail portion according to actual conditions.

[0034] In an alternative embodiment, as shown in Figure 2 , Figure 3 and Figure 5 the portion of the inner surface of the receiving cavity 290 in contact with the sealing member 340 is a conical surface, and the portion of the outer surface of the sealing member 340 in contact with the receiving cavity 290 is a spherical surface. In an alternative embodiment, as shown in Figure 6 the portion of the inner surface of the receiving cavity 290 in contact with the sealing member 340 is a flat surface. In other embodiments, although not shown, the portion of the inner surface of the receiving cavity 290 in contact with the sealing member 340 can be a spherical surface. By using the spherical-spherical, spherical-flat or conical-spherical cooperation, even if there are manufacturing errors or installation errors and other interference factors, the receiving cavity 290 and the sealing member 340 can still be fully contacted. In addition to the above shapes, those skilled in the art can set the shape of the inner surface of the receiving cavity and the outer surface of the sealing member according to actual conditions.

[0035] In an alternative embodiment, as shown in Figure 2 , Figure 3 and Figure 5As shown, the size of the accommodation cavity 290 in the second direction (e.g. the horizontal direction in the figure) (i.e. the maximum horizontal size of the cross section of the accommodation cavity 290) is greater than the size of the guide portion 110 in the second direction (e.g. the horizontal direction in the figure) (i.e. the maximum horizontal size of the cross section of the guide portion 110). In the embodiments of the present disclosure, since the accommodation cavity 290 is arranged at the tail portion 120, and the horizontal size of the tail portion 120 is greater than the horizontal size of the guide portion 110, the horizontal size of the accommodation cavity 290 can be greater than the horizontal size of the guide portion 110. In contrast, Figure 1 The lower end surface of the guide structure (i.e. the valve needle 14) in the prior art is used to apply force to the sealing member, and if an accommodation cavity is arranged at the lower end surface of the guide structure, the horizontal size of the accommodation cavity must be smaller than the horizontal size of the guide structure. Therefore, in the case of a certain horizontal size of the accommodation cavity, the embodiments of the present disclosure allow the guide portion 110 to have a smaller horizontal size, which is beneficial to reducing the radial size of the electromagnetic valve.

[0036] In optional embodiments, as shown in Figure 2 , Figure 3 and Figure 5 , the side (e.g. the lower side in the figure) of the tail portion 120, which is arranged with the accommodation cavity 290, gradually approaches the other side (e.g. the upper side in the figure) in the direction away from the accommodation cavity 290 (e.g. left or right in the figure). In other words, the thickness of the tail portion 120 gradually thins in the direction away from the accommodation cavity 290 outside the accommodation cavity 290, and this change is based on the inclination of the lower surface of the tail portion 120. In other words, the lower side of the tail portion 120 is approximately umbrella-shaped (ignoring the accommodation cavity 290). In the embodiments of the present disclosure, in the case that the armature 100 is attracted by the electromagnetic valve body 200 to contact the lower end surface of the electromagnetic valve body 200, the lower side of the tail portion 120 forms a backflow channel for oil liquid with the upper surface of the orifice plate valve 330. The above shape of the tail portion 120 is beneficial to increasing the electromagnetic force.

[0037] The embodiments of the present disclosure also provide an electromagnetic valve. As shown in Figure 2 and Figure 3 , the electromagnetic valve comprises the electromagnetic valve body 200 and the armature 100 as described above. In addition, the figure also shows some components cooperating with the electromagnetic valve, including the support ring 320, the orifice plate valve 330 and the sealing member 340. The electromagnetic valve body 200 is provided with a guide hole 210. The guide portion 110 of the armature 100 is in sliding cooperation with the guide hole 210.

[0038] Since the electromagnetic valve in the embodiments of the present disclosure comprises the armature 100 as described above, the specific structure and technical effects of the armature 100 described above also apply to the electromagnetic valve.

[0039] In the embodiments of the present disclosure, as shown in Figure 2 andFigure 3 As shown, a spring 211 is arranged in the guide hole 210. The end of the guide part 110 away from the tail part 120 (e.g. the upper end in the figure) abuts against the spring 211, so that the tail part 120 presses against the sealing member 340. An adjusting washer 220 is arranged between the upper end of the spring 211 and the bottom of the guide hole 210. Based on the thickness of the adjusting washer 220, the spring force of the spring 211 can be adjusted.

[0040] In optional embodiments, as shown in Figure 3 As shown, the electromagnetic valve body 200 is provided with an oil return hole 300, which communicates the guide hole 210 with the outside space of the electromagnetic valve body 200. During the operation of the electromagnetic valve, oil may enter the guide hole 210, causing the pressure in the oil return hole 300 to rise, and the risk that the armature 100 cannot be reset (moved upward). The embodiments of the present disclosure can communicate the guide hole 210 with the outside space by providing the oil return hole 300, so that the oil in the guide hole 210 can flow from the guide hole 210 to the outside, releasing the pressure in the guide hole 210 and ensuring that the armature 100 can be reset smoothly.

[0041] In optional embodiments, as shown in Figure 2 , Figure 3 and Figure 7 As shown, the electromagnetic valve body 200 includes a pole shoe 230 and a skeleton 250. The pole shoe 230 is provided with the guide hole 210 and the oil return hole 300. The skeleton 250 is sleeved outside the pole shoe 230 and close to the tail part 120. A coil 260 is wound on the skeleton 250. The skeleton 250 plays a role in supporting and fixing the enameled wire (i.e. the coil 260), and can isolate the enameled wire from the pole shoe 230, avoiding the occurrence of high-voltage insulation failure. The pole shoe 230 plays a role in closing the magnetic circuit.

[0042] In optional embodiments, as shown in Figure 2 , Figure 3 and Figure 7 As shown, the electromagnetic valve body 200 further includes an outer shell 270. The outer shell 270 is sleeved outside the pole shoe 230 and surrounds the coil 260 and the skeleton 250. The outer shell 270 plays a role in supporting and fixing the skeleton 250. In addition, the outer shell 270 can also play a role in closing the magnetic circuit.

[0043] In optional embodiments, the pole shoe 230 and the armature 100 are subjected to heat treatment to ensure high hardness and improve their impact resistance.

[0044] In optional embodiments, as shown in Figure 2 and Figure 3As shown, the electromagnetic valve body 200 further comprises a pin support seat 240 and a plastic coating material 280. The pin support seat 240 covers the portion lc of the pole shoe 230 away from the tail 120 (i.e. the upper part in the figure). The plastic coating material 280 at least partially covers the pin support seat 240. In addition, the plastic coating material 280 can also cover the shell 270, and fill the gaps between the shell 270 and the skeleton 250, and between the shell 270 and the pole shoe 230. The oil return hole 300 penetrates the side wall of the pin support seat 240 and the side wall of the plastic coating material 280 in addition to the side wall of the pole shoe 230. The pin support seat functions to fix and limit the pin, and also insulates the coil 260 and the pin from the pole shoe 230. The plastic coating material 280 can be made of a high-temperature resistant material (e.g. greater than 210°C). The plastic coating material 280 can seal, fix and protect the internal structure as a whole.

[0045] In addition to the above structure, although not shown, those skilled in the art can also use other forms of electromagnetic valve body structures.

[0046] Optionally, the armature 100 and the pole shoe 230 can be made of steel materials of types 1018, 16MnCrS5, #20, etc.

[0047] Figure 4 The states of the components of the electromagnetic valve in the energized state and the de-energized state are shown. As shown in Figure 2 , Figure 3 and Figure 4 , in the de-energized state (left side state in Figure 4 ), the coil 260 does not generate a magnetic force, the armature 100 only has a downward movement tendency under the elastic force of the spring 211, the tail 120 of the armature 100 presses down the sealing component 340, so that the sealing component 340 seals the oil passage 331 in the hole plate valve 330. In the energized state (right side state in Figure 4 ), the coil 260 generates a magnetic force, which generates an upward attractive force on the armature 100 that is greater than the elastic force of the spring, the armature 100 moves upward so that the upper side of the tail 120 contacts the lower end surface of the electromagnetic valve body 200, the sealing component 340 is no longer pressed down by the tail 120, so that the oil passage 331 in the hole plate valve 330 is opened.

[0048] The electromagnetic valve body 200 and the hole plate valve 330 can be provided with a support ring 320. By changing the vertical dimension of the support ring 320, the spacing distance between the electromagnetic valve body 200 and the hole plate valve 330 can be adjusted.

[0049] The embodiments of the present disclosure also provide an oil injector, which comprises the electromagnetic valve and the sealing component described above, and the tail of the armature of the electromagnetic valve is adapted to apply a force to the sealing component.

[0050] Since the fuel injector in the embodiments of the present disclosure comprises the solenoid valve described above, the specific structure and technical effects of the solenoid valve described above also apply to the fuel injector.

[0051] In an optional embodiment, in the fuel injector, a side of the tail of the armature of the solenoid valve away from the guide part is provided with a receiving cavity, a part of the inner surface of the receiving cavity adapted to contact the sealing part is a spherical surface or a conical surface, and a part of the outer surface of the sealing part adapted to contact the receiving cavity is a spherical surface.

[0052] In an optional embodiment, referring to Figure 2 or Figure 3 the sealing part 340 is a hemisphere (or larger than a hemisphere), wherein the spherical surface is used to contact the receiving cavity 290, and the flat surface is used to seal the oil passage 331 in the orifice plate valve 330. In addition, although not shown, the sealing part 340 can also be spherical or other shapes.

[0053] Based on the above, the present disclosure proposes the following technical solutions:

[0054] 1. An armature, comprising:

[0055] a guide part extending in a first direction;

[0056] a tail located at one end of the guide part and extending in a second direction perpendicular to the first direction,

[0057] wherein:

[0058] a size of the tail in the second direction is greater than a size of the guide part in the second direction;

[0059] the guide part is adapted to be in sliding fit with a guide hole provided on a solenoid valve;

[0060] a side of the tail away from the guide part is adapted to apply a force to a corresponding sealing part.

[0061] 2. The armature according to 1, wherein:

[0062] the guide part and the tail are integrally formed.

[0063] 3. The armature according to 1, wherein:

[0064] a side of the tail away from the guide part is provided with a receiving cavity, and an inner surface of the receiving cavity is adapted to contact an outer surface of a sealing part.

[0065] 4. The armature according to 3, wherein:

[0066] A portion of the inner surface of the accommodation cavity adapted to contact the sealing member is a spherical surface or a conical surface, and a portion of the outer surface of the sealing member adapted to contact the accommodation cavity is a spherical surface.

[0067] 5. The armature according to claim 3, wherein:

[0068] The dimension of the accommodation cavity in the second direction is greater than the dimension of the guide portion in the second direction.

[0069] 6. The armature according to any one of claims 3 to 5, wherein the tail portion is provided such that one side of the accommodation cavity gradually approaches the other side in a direction away from the accommodation cavity.

[0070] 7. An electromagnetic valve comprising an electromagnetic valve main body and the armature according to any one of claims 1 to 6, the electromagnetic valve main body being provided with a guide hole, and the guide portion of the armature being in sliding fit with the guide hole.

[0071] 8. The electromagnetic valve according to claim 7, wherein:

[0072] The electromagnetic valve main body is further provided with a return hole that communicates the guide hole with an external space of the electromagnetic valve main body.

[0073] 9. The electromagnetic valve according to claim 8, wherein:

[0074] The electromagnetic valve main body includes a pole piece, and the guide hole and the return hole are provided on the pole piece.

[0075] 10. The electromagnetic valve according to claim 9, wherein:

[0076] The electromagnetic valve main body further includes a skeleton that is fitted outside the pole piece and is close to the tail portion, and a coil that is wound around the skeleton.

[0077] 11. The electromagnetic valve according to claim 10, wherein:

[0078] The electromagnetic valve main body further includes a housing that is fitted outside the pole piece and surrounds the coil and the skeleton.

[0079] 12. The electromagnetic valve according to claim 11, wherein:

[0080] The electromagnetic valve main body further includes a pin support seat that covers a portion of the pole piece away from the tail portion.

[0081] 13. The electromagnetic valve according to claim 12, wherein:

[0082] The electromagnetic valve main body further includes a plastic material that at least partially covers the pin support seat.

[0083] 14. The electromagnetic valve according to claim 13, wherein:

[0084] The potting material also fills the gap between the housing and the pole piece and / or the gap between the housing and the skeleton.

[0085] 15. The electromagnetic valve according to claim 7, wherein:

[0086] A spring is arranged in the guide hole, and an end of the guide portion away from the tail portion abuts against the spring, so that the tail portion presses against the sealing member.

[0087] 16. The electromagnetic valve according to any one of claims 7-15, wherein:

[0088] The armature and / or the pole piece is heat treated to increase the hardness.

[0089] 17. An injector comprising the electromagnetic valve according to any one of claims 7-16 and a sealing member, the tail portion of the armature of the electromagnetic valve being adapted to apply a force to the sealing member.

[0090] 18. The injector according to claim 17, wherein:

[0091] An accommodating cavity is arranged on the side of the tail portion of the armature away from the guide portion in the electromagnetic valve, the inner surface of the accommodating cavity is spherical or conical at the portion adapted to contact the sealing member, and the outer surface of the sealing member is spherical at the portion adapted to contact the accommodating cavity.

[0092] The above merely illustrates the embodiments of the present disclosure, and is not used to limit the present disclosure, and any modification, equivalent replacement, improvement, etc. made by those skilled in the art without departing from the spirit and principle of the present disclosure shall be included in the scope of protection of the present disclosure.

Claims

1. An armature, comprising: The guide section extends along the first direction; The tail portion is located at one end of the guide portion and extends along a second direction perpendicular to the first direction. in: The tail portion has a larger dimension in the second direction than the guide portion has a larger dimension in the second direction; The guide portion is adapted to slide into a guide hole provided on the solenoid valve. The solenoid valve is provided with an oil return hole. One end of the oil return hole communicates with the guide hole, and the other end of the oil return hole communicates with the external space of the solenoid valve. The side of the tail portion away from the guide portion is adapted to apply a force to the corresponding sealing component.

2. The armature according to claim 1, wherein: The guide section and the tail section are integrally formed.

3. The armature according to claim 1, wherein: A receiving cavity is provided on the side of the tail portion away from the guide portion, and the inner surface of the receiving cavity is adapted to contact the outer surface of the sealing component.

4. The armature according to claim 3, wherein: The portion of the inner surface of the accommodating cavity that is suitable for contacting the sealing component is a spherical or conical surface, and the portion of the outer surface of the sealing component that is suitable for contacting the accommodating cavity is a spherical surface.

5. The armature according to claim 3, wherein: The dimension of the accommodating cavity in the second direction is greater than the dimension of the guide portion in the second direction.

6. The armature according to any one of claims 3-5, wherein, The side of the tail portion where the receiving cavity is located gradually moves towards the other side in a direction away from the receiving cavity.

7. A solenoid valve, comprising a solenoid valve body and an armature as described in any one of claims 1-6, wherein the solenoid valve body is provided with a guide hole, and the guide portion of the armature is slidably engaged with the guide hole.

8. The solenoid valve according to claim 7, wherein: The solenoid valve body includes a pole shoe, on which the guide hole and the return oil hole are provided.

9. The solenoid valve according to claim 8, wherein: The solenoid valve body also includes a frame and a coil. The frame is sleeved outside the pole shoe and close to the tail. The coil is wound around the frame.

10. The solenoid valve according to claim 9, wherein: The solenoid valve body also includes a housing, which is fitted over the pole shoe and surrounds the coil and the frame.

11. The solenoid valve according to claim 10, wherein: The solenoid valve body also includes a pin support seat, which covers the portion of the pole shoe away from the tail.

12. The solenoid valve according to claim 11, wherein: The solenoid valve body also includes a plastic coating material, which at least partially covers the pin support seat.

13. The solenoid valve according to claim 12, wherein: The plastic coating material also fills the gap between the outer shell and the pole shoe and / or the gap between the outer shell and the frame.

14. The solenoid valve according to claim 8, wherein: A spring is provided inside the guide hole, and the end of the guide portion away from the tail portion abuts against the spring so that the tail portion presses against the sealing component.

15. The solenoid valve according to any one of claims 8-14, wherein: The armature and / or the pole shoe are heat-treated to increase hardness.

16. An injector comprising a solenoid valve and a sealing component as claimed in any one of claims 7-15, wherein the tail of the armature of the solenoid valve is adapted to apply a force to the sealing component.

17. The injector according to claim 16, wherein: The armature of the solenoid valve has a receiving cavity on the side away from the guide portion at its tail end. The inner surface of the receiving cavity that is suitable for contacting the sealing component is a spherical or conical surface, and the outer surface of the sealing component that is suitable for contacting the receiving cavity is a spherical surface.

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