An injection valve for a multi-point injection engine equipped with a mixer

Abstract

The present application discloses an injection valve of a multi-point injection engine equipped with a mixer, comprising a multi-point injection valve body and a mixer. The mixer is fixed to the lower end of the multi-point injection valve body. An annular cavity of the mixer and a cross injection frame are arranged in the mixer. The inner hole of the multi-point injection valve body is communicated with the annular cavity of the mixer. The cross end of the cross injection frame is fixed to the inner side of the annular cavity of the mixer. On the inner wall of the annular cavity of the mixer, a plurality of injection holes 1 radially penetrating toward the inner side are evenly arranged along the circumferential direction, and the injection hole 1 is inclined toward the air intake direction of the intake manifold. The inner hole of the annular cavity of the mixer is communicated with the inner holes of the two cross sides of the cross injection frame. The two cross sides are provided with a plurality of evenly distributed injection holes 2 penetrating along the direction of the cross side where the vertical hole is located. The air is first mixed with the fuel gas ejected from the first injection hole once, and then mixed with the fuel gas ejected from the second injection hole, so that the air and the fuel gas are evenly mixed in the mixer.

Description

Technical Field

[0001] The invention relates to an injection valve of a multi-point injection engine equipped with a mixer, belonging to the field of gas engines. Background Art

[0002] Gas engines generally refer to engines that use natural gas as fuel and have been widely used in daily social production. According to the way the mixture is formed, gas engines are generally divided into single-point injection engines and multi-point injection engines. A multi-point injection gas engine is a gas engine that injects natural gas at a pressure of 3 bar to 5 bar into the intake manifold, forms a uniform mixture with the incoming air, and then inhales it into the cylinder to ignite and perform work. Compared with traditional low-pressure gas engines, multi-point injection gas engines have the advantages of fast torque response, low exhaust temperature, and reduced risk of backfire in gas engines.

[0003] In a multi-point injection gas engine, high-pressure gas forms a mixture with air in the intake manifold, and the intake manifold structure is generally short, and there is often insufficient space and time for the gas and air to be fully mixed. This will cause the mixture to enter the cylinder to be unevenly mixed, resulting in poor combustion conditions in the cylinder and reduced thermal efficiency. At the same time, due to the dynamic changes in gas pressure, the injection accuracy is insufficient, resulting in large changes in the concentration of the mixture, which leads to poor work done in the cylinder. Summary of the invention

[0004] The purpose of the present invention is to provide an injection valve for a multi-point injection engine, in which an annular injection channel is added to an intake manifold, a cross injection channel is connected to the annular injection channel, the annular injection channel is provided with radial injection holes inclined toward the air intake direction, and the cross injection channel is provided with injection holes perpendicular to the cross sides of the channel.

[0005] The technical solution of the present invention is implemented as follows: an injection valve of a multi-point injection engine equipped with a mixer, comprising a multi-point injection valve body 1, a mixer 2, a gas pressure sensor 5, an injection valve controller 6, an injection valve needle 7, and a connecting valve seat 9. The connecting valve seat 9 is fixed on the mixer 2, and the connecting valve seat 9 fixes the lower end of the multi-point injection valve body 1. A mixer annular cavity 14 and a cross injection rack 15 are arranged in the mixer 2. The inner hole of the multi-point injection valve body 1 is communicated with the mixer annular cavity 14 in the mixer 2. The cross end of the cross injection rack 15 is fixed on the inner side of the mixer annular cavity 14. On the inner side wall of the mixer annular cavity 14, a plurality of injection holes 1 are evenly distributed along the circumferential direction and penetrate radially toward the inside, and the injection hole 1 is inclined toward the air intake direction of the intake manifold 17. The intake manifold 17 includes an intake manifold 1 and an intake manifold 2. The two sides of the mixer 2 are respectively It is fixedly connected to one end of intake manifold one and one end of intake manifold two, the other end of intake manifold one is fixedly connected to the intake main pipe, and the other end of intake manifold two is fixedly connected to the cylinder 19. The mixer annular cavity 14 is coaxially arranged with the intake manifold 17, and the multi-point injection valve body 1 is vertically arranged with the intake manifold 17. The inner hole of the mixer annular cavity 14 is connected with the inner holes of the two cross sides of the cross injection frame 15, and the two cross sides are provided with multiple injection holes 2 uniformly distributed along the cross side direction where the vertical holes are located; the inner cavity of the multi-point injection valve body 1 is provided with a gas pressure sensor 5 for detecting the pressure of the gas, and the middle part of the inner cavity of the multi-point injection valve body 1 is also provided with an injection valve needle 7, and the injection valve needle 7 is connected with the injection valve controller 6 through a line to control the opening time of the injection valve needle 7, and the injection valve controller 6 is connected with the driving computer 10 through a line.

[0006] The radial angle between the injection hole 1 and the mixer annular chamber 14 is a, and the value range of a is 5° to 20°.

[0007] The mixer 2 is provided with a mixer conical sealing surface 11 , and the lower end of the multi-point injection valve body 1 is in close contact and sealed with the mixer conical sealing surface 11 .

[0008] The air inlet of the multi-point injection valve body 1 is connected to the gas output device.

[0009] The value of a is 13°.

[0010] Compared with the prior art, the present invention has the following positive effects:

[0011] The device adds a mixer on the basis of a general multi-point high-pressure injection valve. The added mixer structure allows the injected high-pressure fuel gas to be fully mixed with the air in the intake manifold to form a relatively uniform mixed gas, which then enters the cylinder for combustion and work. The mixer and the injection valve are connected as a whole through threaded connection and conical surface sealing. A fuel pressure control mechanism and a pressure difference adjustment mechanism are arranged in the injection valve body, which improves the accuracy of the amount of natural gas injected by the fuel injection valve and is more conducive to controlling the concentration of the mixed gas. The mixer and the intake manifold are connected by a flange, which has good sealing performance and is convenient and quick to install. The structure of the present invention greatly improves the accuracy of the fuel gas injection amount, improves the uniformity of the mixed gas, and thus improves the working stability and thermal efficiency of the engine. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 It is a schematic diagram of the overall structure of the multi-point injection valve body and the mixer.

[0013] Figure 2 It is a schematic diagram of the structure of the mixer installed on the intake manifold.

[0014] Figure 3 This is a schematic diagram of the air intake direction on the intake manifold.

[0015] Figure 4 It is a schematic diagram of the gas mixing direction of the mixer on the intake manifold.

[0016] Figure numerals: 1—multi-point injection valve body, 2—mixer, 3—gas inlet, 5—gas pressure sensor, 6—injection valve controller, 7—injection valve needle, 9—connecting valve seat, 10—on-board computer (ECU), 11—conical sealing surface of mixer, 14—annular cavity of mixer, 15—cross injection rack, 16—intake main pipe, 17—intake manifold, 18—injection valve assembly, 19—cylinder, 20—air inflow direction of intake manifold, 21—inclination direction of outer cylindrical injection hole of mixer, 22—mixed gas outflow direction, 23—gas ejection direction of cross injection rack. DETAILED DESCRIPTION

[0017] Combination Figures 1 to 4The present invention discloses an injection valve for a multi-point injection engine equipped with a mixer, comprising a multi-point injection valve body 1, a mixer 2, a gas pressure sensor 5, an injection valve controller 6, an injection valve needle 7, and a connecting valve seat 9. The mixer 2 is provided with a mixer conical sealing surface 11, and the lower end of the multi-point injection valve body 1 is sealed with the mixer conical sealing surface 11. The mixer 2 is fixed with a connecting valve seat 9, and the connecting valve seat 9 fixes the lower end of the multi-point injection valve body 1. The mixer 2 is provided with a mixer annular cavity 14 and a cross injection rack 15. The inner hole of the multi-point injection valve body 1 is connected with the mixer annular cavity 14 in the mixer 2. The cross end of the cross injection rack 15 is fixed to the inner side of the mixer annular cavity 14. On the inner side wall of the mixer annular cavity 14, a plurality of injection holes that penetrate radially inward are evenly distributed along the circumferential direction. 1, and the injection hole 1 is inclined toward the air intake direction of the intake manifold 17, the intake manifold 17 includes an intake manifold 1 and an intake manifold 2, the two sides of the mixer 2 are respectively fixedly connected to one end of the intake manifold 1 and one end of the intake manifold 2, the other end of the intake manifold 1 is fixedly connected to the intake manifold, and the other end of the intake manifold 2 is fixedly connected to the cylinder 19, the mixer annular cavity 14 is coaxially arranged with the intake manifold 17, the multi-point injection valve body 1 is vertically arranged with the intake manifold 17, the radial direction of the injection hole 1 and the mixer annular cavity 14 is angle a, the value range of a is 5° to 20°, for example, 13°, the inner hole of the mixer annular cavity 14 is connected to the inner holes of the two cross sides of the cross injection frame 15, and the two cross sides are provided with a plurality of injection holes 2 uniformly distributed and penetrating along the cross side direction where the vertical hole is located.

[0018] The inner cavity of the multi-point injection valve body 1 is provided with a gas pressure sensor 5 for detecting the pressure of the gas. The middle part of the inner cavity of the multi-point injection valve body 1 is also provided with an injection valve needle 7, which is connected to the injection valve controller 6 through a line to control the opening time of the injection valve needle 7.

[0019] The air inlet of the multi-point injection valve body 1 is connected to the gas output device.

[0020] The injection valve controller 6 is connected to an on-board computer (ECU) 10 via a line.

[0021] Working principle:

[0022] When the ECU calculates that the fuel gas needs to be injected, it sends a signal to open the injection valve needle 7 and an opening duration signal to the injection valve controller 6. After receiving the signal, the injection valve controller 6 opens the injection valve needle 7 for the set time, and the fuel gas flowing into the injection valve body 1 from the fuel gas inlet 3 passes through the injection valve needle 7 and is injected into the mixer 2. The fuel gas injected into the mixer 2 is ejected along the injection hole 1 set on the mixer annular cavity 14 and the injection hole 2 of the cross injection frame 15, as shown in FIG. Figure 3 , Figure 4As shown, the gas ejected from the second injection hole is in a cross injection rack gas ejection direction 23, which is at an angle of 90° to the air inflow direction 20 of the intake manifold. The gas ejected from the first injection hole is in an inclined direction 21 of the outer circle injection hole of the mixer, which is at an angle of 90°+a to the air inflow direction 20 of the intake manifold. The directions of the gas ejected from the first injection hole and the second injection hole are different, so that the air and the gas are mixed twice, that is, the air is first mixed with the gas ejected from the first injection hole once, and then mixed with the gas ejected from the second injection hole, so that the air and the gas are evenly mixed in the mixer 2.

Claims

1. An injection valve for a multi-point injection engine equipped with a mixer, characterized in that: The invention comprises a multi-point injection valve body (1), a mixer (2), a gas pressure sensor (5), an injection valve controller (6), an injection valve needle (7), and a connecting valve seat (9). The connecting valve seat (9) is fixed on the mixer (2), and the connecting valve seat (9) fixes the lower end of the multi-point injection valve body (1). A mixer annular cavity (14) and a cross injection rack (15) are arranged in the mixer (2). The inner hole of the multi-point injection valve body (1) is communicated with the mixer annular cavity (14) in the mixer (2). The cross end of the cross injection rack (15) is fixed on the inner side of the mixer annular cavity (14). A plurality of injection holes are evenly distributed along the circumferential direction and penetrate radially inwardly on the inner side wall of the mixer annular cavity (14), and the injection holes are arranged in a radial direction. The perforation 1 is inclined toward the air intake direction of the intake manifold (17), the intake manifold (17) comprises an intake manifold 1 and an intake manifold 2, the two sides of the mixer (2) are respectively fixedly connected to one end of the intake manifold 1 and one end of the intake manifold 2, the other end of the intake manifold 1 is fixedly connected to the intake manifold, and the other end of the intake manifold 2 is fixedly connected to the cylinder (19), the mixer annular cavity (14) is coaxially arranged with the intake manifold (17), the multi-point injection valve body (1) is vertically arranged with the intake manifold (17), the inner hole of the mixer annular cavity (14) is connected with the inner holes of the two cross sides of the cross injection frame (15), and the two cross sides are provided with a plurality of injection holes 2 uniformly distributed and penetrating along the direction of the cross side where the vertical hole is located; The inner cavity of the multi-point injection valve body (1) is provided with a gas pressure sensor (5) for detecting the pressure of the gas. The middle part of the inner cavity of the multi-point injection valve body (1) is also provided with an injection valve needle (7). The injection valve needle (7) is connected to the injection valve controller (6) through a line to control the opening time of the injection valve needle (7). The injection valve controller (6) is connected to the driving computer (10) through a line.

2. The injection valve of a multi-point injection engine equipped with a mixer according to claim 1, characterized in that: The angle between the injection hole 1 and the radial direction of the mixer annular chamber (14) is a, and the value range of a is 5° to 20°.

3. The injection valve of a multi-point injection engine equipped with a mixer according to claim 2, characterized in that: The mixer (2) is provided with a mixer conical sealing surface (11), and the lower end of the multi-point injection valve body (1) is in close contact and sealed with the mixer conical sealing surface (11).

4. The injection valve of a multi-point injection engine equipped with a mixer according to any one of claims 1 to 3, characterized in that: The air inlet of the multi-point injection valve body (1) is connected to a gas output device.

5. The injection valve of a multi-point injection engine equipped with a mixer according to claim 2 or 3, characterized in that: The value of a is 13°.

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