Piezoelectric oil sprayer

Abstract

An annular concave part used for being connected with the lower end of an electromagnetic valve assembly in a clamped mode is formed in the upper end face of a shell, the upper end of an oil injector body is located in the annular concave part, an upper edge wall is arranged on the annular concave part, threads are arranged on the outer side of the upper edge wall, and a limiting ring is arranged on the lower side of the electromagnetic valve assembly. An inner edge extending inwards is arranged at the upper end of the barrel-shaped connecting piece, threads are arranged on the inner side of the barrel-shaped connecting piece, the lower end of the electromagnetic valve assembly is inserted into the annular concave, the lower end face of the limiting ring abuts against the upper end face of the upper edge wall, and a knob of the barrel-shaped connecting piece is in threaded connection with the outer side of the upper edge wall. The utility model has the advantages of simple structure, convenience and quickness in installation, few parts and good sealing performance after installation.

Description

Technical Field

[0001] The utility model relates to a piezoelectric fuel injector. Background Art

[0002] All gasoline engines produced nowadays have injectors (except motorcycles). Injectors are commonly known as fuel injection nozzles. Simply put, the function of the injector on a gasoline engine is to change a certain amount of fuel from liquid to mist, and then mix it with air; the electronically controlled injector generally contains a valve column, a spring top column, a valve core, a spring, and a valve seat (including a sealing steel ball). The spring top column is inside the valve column and presses against one end of the spring, and the other end of the spring presses against the valve core. A coil is provided outside the electronically controlled injector. The working principle is that when the coil is not energized, the valve core of the electronically controlled injector presses against the sealing steel ball under the combined action of high-pressure gasoline and the spring, and the oil circuit is blocked. When the coil is energized, magnetic force is generated, the valve core moves, and the high-pressure gasoline is ejected after passing through the sealing steel ball.

[0003] The existing piezoelectric injector has a complex installation structure and poor sealing performance. Utility Model Content

[0004] In order to solve the above problems, a piezoelectric injector is specially made.

[0005] To achieve the above-mentioned purpose, the present invention is solved through the following technical solutions: a piezoelectric injector, comprising a shell, an injector body and a solenoid valve assembly, the injector body is arranged in the shell, and the upper end surface of the shell is provided with an annular recess for clamping and connecting the lower end of the solenoid valve assembly, the upper end of the injector body is located in the annular recess, the annular recess is provided with an upper edge wall, the outer side of the upper edge wall is provided with a thread, a limit ring is provided on the lower side of the solenoid valve assembly, a cylindrical connecting piece is sleeved on the lower side of the solenoid valve assembly, and the upper end of the cylindrical connecting piece is provided with an inner edge extending inward, the inner side of the cylindrical connecting piece is provided with a thread, the lower end of the solenoid valve assembly is inserted into the annular recess, the lower end surface of the limit ring is against the upper end surface of the upper edge wall, and the knob of the cylindrical connecting piece is threadedly connected to the outer side of the upper edge wall.

[0006] Furthermore, corresponding first grooves are provided on the lower end surface of the limiting ring and the upper end surface of the upper wall, and a first sealing ring is provided in the first groove.

[0007] Furthermore, the first groove is provided on the upper end surface of the upper wall, the lower half of the first sealing ring is embedded in the first groove, and the lower half of the first sealing ring protrudes from the upper end surface of the upper wall.

[0008] Furthermore, corresponding second grooves are provided on the upper end surface of the limiting ring and the lower end surface of the inner edge, and a second sealing ring is provided in the second groove.

[0009] Furthermore, the second groove is a trapezoidal groove, and the cross-section of the second sealing ring is dovetail-shaped.

[0010] Furthermore, the second groove is arranged on the upper end surface of the limiting ring, the dovetail portion of the lower end of the second sealing ring is arranged in the second groove, and the arc portion of the upper end of the second sealing ring protrudes from the upper end surface of the limiting ring.

[0011] Furthermore, the inner side of the inner edge is arc-shaped.

[0012] The utility model has the advantages of simple structure, convenient and quick installation, fewer parts, and good sealing after installation. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 This is a schematic structural diagram of the utility model.

[0014] Figure 2 This is an enlarged view of part A. DETAILED DESCRIPTION

[0015] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments.

[0016] Example 1 Refer to the attached Figure 1-2 A piezoelectric injector comprises a shell 1, an injector body 2 and a solenoid valve assembly 3. The injector body is arranged in the shell, and the upper end surface of the shell is provided with an annular recess 4 for engaging and connecting the lower end of the solenoid valve assembly. The upper end of the injector body is located in the annular recess, and the annular recess is provided with an upper wall 5, and the outer side of the upper wall is provided with a thread. A limit ring 6 is provided on the lower side of the solenoid valve assembly, and a cylindrical connecting piece 7 is sleeved on the lower side of the solenoid valve assembly, and the upper end of the cylindrical connecting piece is provided with an inner edge 8 extending inward, and the inner side of the cylindrical connecting piece is provided with a thread. The lower end of the solenoid valve assembly is inserted into the annular recess, and the lower end surface of the limit ring is against the upper end surface of the upper wall. The knob of the cylindrical connecting piece is threadedly connected to the outer side of the upper wall.

[0017] A piezoelectric fuel injector, wherein corresponding first grooves 9 are provided on the lower end surface of the limiting ring and the upper end surface of the upper wall, and a first sealing ring 10 is provided in the first groove.

[0018] A piezoelectric fuel injector has a first groove arranged on the upper end surface of an upper wall, a lower half of a first sealing ring is embedded in the first groove, and the lower half of the first sealing ring is raised from the upper end surface of the upper wall.

[0019] A piezoelectric fuel injector is provided with corresponding second grooves 11 on the upper end surface of the limiting ring and the lower end surface of the inner edge, and a second sealing ring 12 is provided in the second groove.

[0020] A piezoelectric fuel injector, wherein the second groove is a trapezoidal groove and the cross section of the second sealing ring is dovetail-shaped.

[0021] A piezoelectric fuel injector, wherein a second groove is arranged on the upper end surface of a limiting ring, a dovetail portion at the lower end of a second sealing ring is arranged in the second groove, and an arc portion at the upper end of the second sealing ring protrudes from the upper end surface of the limiting ring.

[0022] A piezoelectric fuel injector has an inner edge that is arc-shaped.

[0023] A piezoelectric fuel injector, wherein the upper end of a cylindrical connecting piece is inserted into a solenoid valve assembly from bottom to top and then riveted to form an inner edge.

[0024] A piezoelectric fuel injector, wherein the lower end of the solenoid valve assembly is columnar.

[0025] A piezoelectric fuel injector has two symmetrical vertical positioning grooves with lower openings on the outer side of the column, and the vertical positioning grooves are no higher than half of the height of the annular inner recess; a corresponding vertical positioning protrusion is provided on the inner side of the annular inner recess.

[0026] A piezoelectric fuel injector has a simple structure, is easy and quick to install, has few parts, and has good sealing performance after installation.

[0027] For those skilled in the art, it is obvious that the present invention is not limited to the details of the above-mentioned exemplary embodiments, and the present invention can be implemented in other specific forms without departing from the spirit or basic characteristics of the present invention. Therefore, no matter from which point of view, the embodiments should be regarded as exemplary and non-restrictive. The scope of the present invention is limited by the appended claims rather than the above description. Therefore, it is intended that all changes that fall within the meaning and scope of the equivalent elements of the claims are included in the present invention.

Claims

1. A piezoelectric fuel injector comprising a housing, a fuel injector body, and a solenoid valve assembly, wherein the fuel injector body is disposed within the housing, and wherein: The upper end surface of the shell is provided with an annular recess for locking and connecting the lower end of the solenoid valve assembly. The upper end of the injector body is located in the annular recess, and an upper edge wall is provided on the annular recess. A thread is provided on the outer side of the upper edge wall. A limit ring is provided on the lower side of the solenoid valve assembly. The cylindrical connecting piece is sleeved on the lower side of the solenoid valve assembly, and the upper end of the cylindrical connecting piece is provided with an inner edge extending inward, and a thread is provided on the inner side of the cylindrical connecting piece. The lower end of the solenoid valve assembly is inserted into the annular recess, and the lower end surface of the limit ring is against the upper end surface of the upper edge wall. The knob of the cylindrical connecting piece is threadedly connected to the outer side of the upper edge wall.

2. A piezoelectric fuel injector according to claim 1, characterized in that: Corresponding first grooves are provided on the lower end surface of the limiting ring and the upper end surface of the upper wall, and a first sealing ring is provided in the first groove.

3. A piezoelectric fuel injector according to claim 2, characterized in that: The first groove is arranged on the upper end surface of the upper wall, the lower half of the first sealing ring is embedded in the first groove, and the lower half of the first sealing ring is protruded from the upper end surface of the upper wall.

4. The piezoelectric fuel injector according to claim 1, characterized in that: Corresponding second grooves are provided on the upper end surface and the lower end surface of the inner edge of the limiting ring, and a second sealing ring is provided in the second groove.

5. The piezoelectric fuel injector according to claim 4, characterized in that: The second groove is a trapezoidal groove, and the cross section of the second sealing ring is dovetail-shaped.

6. The piezoelectric fuel injector according to claim 5, characterized in that: The second groove is arranged on the upper end surface of the limiting ring, the dovetail portion of the lower end of the second sealing ring is arranged in the second groove, and the arc portion of the upper end of the second sealing ring protrudes from the upper end surface of the limiting ring.

7. The piezoelectric fuel injector according to claim 1, characterized in that: The inner side of the inner edge is curved.

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