A valve seat and high-pressure oblique-entry nozzle

Abstract

The present invention discloses a valve seat, wherein a vacuum groove is formed on the cavity wall of the first sealing cavity near the nozzle hole. By setting the vacuum groove, when a high-speed fluid medium rotates along the cavity wall of the first sealing cavity and flows toward the nozzle hole, the high-speed fluid medium drives the air in the vacuum groove to form a cyclone, thereby forming a negative pressure state. In the process of forming the cyclone, the air enters the nozzle hole together with the fluid medium, and finally forms a mist-like spray. In this process, the cyclonic turbulence of the air in the vacuum groove can carry away the residual part of the fluid medium on the inverted cone surface or spherical arc surface structure below the sphere after the sphere contacts and seals with the inverted cone surface or spherical arc surface structure, thereby avoiding residual fluid medium, and further reducing the blockage of the nozzle hole by impurities after hardening and drying, thereby affecting the atomization effect.

Description

Technical Field

[0001] The invention relates to the technical field of nozzles, and in particular to a valve seat and a high-pressure oblique-entry nozzle using the valve seat. Background Art

[0002] The nozzle is one of the key components of the electronic fuel injection engine, and its performance will seriously affect the engine performance. The existing nozzle is generally a simple electromagnetic valve structure. For example, CN2016209634863 discloses a urea nozzle, which includes a shell, a valve body is arranged in the shell, a coil assembly is arranged between the valve body and the shell, an adjustment sleeve and a valve core are arranged in the valve body, and the valve core can slide in the valve body. A spring fixing seat is arranged in the adjustment sleeve, and an elastic member is arranged between the spring fixing seat and the valve core. A sphere is arranged between the front end of the valve core through the partition and the nozzle, and the sphere is a whole sphere or a partial sphere. A plurality of spray holes are arranged in the circumference of the valve core. A storage cavity is arranged between the valve core, the partition and the nozzle. A connecting groove for connecting the storage cavity with the nozzle is arranged on the partition. The nozzle includes an inverted cone structure and a nozzle hole that are connected to each other. The sphere cooperates with the inverted cone structure to realize the opening and closing of the nozzle. The spring fixing seat is a stepped structure, and its front end diameter is smaller than the rear end. Its front end is a cylindrical structure, and its rear end is an unclosed cylindrical structure. One end of the spring fixing seat contacts one end of the spring, and the other end of the spring contacts the valve core. In the above structure, the partition can also be called a valve seat or other names. When the electromagnetic coil assembly is energized, suction is generated, the needle valve is sucked up, and the corresponding ball leaves the inverted cone surface or spherical arc surface structure of the spray hole. At this time, the nozzle is opened, and the fuel and other media flow through the gap between the ball and the inverted cone surface or spherical arc surface structure and are sprayed out at high speed through the nozzle hole to form a mist. However, in practice, after the nozzle has been used for a long time, some oil will remain on the inverted cone surface or spherical arc surface structure below the ball after the contact and sealing between the ball and the inverted cone surface or spherical arc surface structure, which is easy to form a large amount of insoluble and interconnected polymerized network viscous substances. The substance gradually accumulates and eventually adheres to the inverted cone surface or spherical arc surface structure, forming surface coking, and eventually blocking or partially blocking the nozzle hole, affecting the spray effect. Summary of the invention

[0003] In order to solve the above technical problems, the present invention provides a valve seat, which includes: a valve seat body; a first cylindrical cavity, a vortex cavity, a first sealing cavity and a nozzle hole which are interconnected are formed in the valve seat body, and a vacuum groove is formed on the cavity wall of the first sealing cavity near the nozzle hole; a table-like structure with one end small and the other end large is formed on the upper part of the valve seat body, and the table-like structure forms an inclined side surface, and the inclined side surface is connected to the vortex cavity through at least one guide hole, and at the same time, the angle between the central axis of the guide hole and the radial surface of the first cylindrical cavity is greater than 0 degrees.

[0004] Furthermore, the swirl chamber is a first frustum chamber, a second cylindrical chamber, a first cone chamber and a first inverted frustum chamber which are interconnected; wherein the diameter of the second cylindrical chamber is greater than the diameter of the first cylindrical chamber.

[0005] Furthermore, there are 6 guide holes, and the 6 guide holes are evenly arranged.

[0006] Furthermore, the guide hole is arranged obliquely downward, deviating from the axial section of the first cylindrical cavity.

[0007] Furthermore, the guide hole comprises two sections of cylindrical holes that are connected to each other, wherein the diameter of the cylindrical hole close to the inclined side surface is larger than the diameter of the cylindrical hole far from the inclined side surface.

[0008] Furthermore, the nozzle hole is arranged obliquely.

[0009] Furthermore, a second inverted frustum cavity and a third cylindrical cavity are formed above the first cylindrical cavity, and the top end of the cavity wall of the third cylindrical cavity is chamfered.

[0010] Furthermore, the upper end of the terrace-like structure is chamfered.

[0011] The invention also discloses a high-pressure oblique-entry nozzle, which comprises the valve seat described above.

[0012] The above technical solution of the present invention has the following advantages compared with the prior art:

[0013] (1) The valve seat of the present invention forms a vacuum groove on the cavity wall of the first sealing cavity near the nozzle hole. By setting the vacuum groove, when the high-speed fluid medium rotates along the cavity wall of the first sealing cavity and flows toward the nozzle hole, the high-speed fluid medium drives the air in the vacuum groove to form a cyclone, thereby forming a negative pressure state. In the process of forming the cyclone, the air enters the nozzle hole together with the fluid medium, and finally forms a mist spray. In this process, the cyclonic turbulence of the air in the vacuum groove can carry away the residual part of the fluid medium on the inverted cone surface or spherical arc surface structure below the sphere after the sphere contacts and seals with the inverted cone surface or spherical arc surface structure, thereby avoiding residual fluid medium, and further reducing the hardening and drying of impurities to block the nozzle hole and affect the atomization effect.

[0014] (2) The present invention innovatively sets a terrace-shaped structure and an oblique-entry guide hole on the valve seat, and the fluid medium enters the swirl chamber obliquely downward along the guide hole, thereby forming a fluid medium flow that rotates and accelerates around the axis. In the process of forming the rotating fluid medium flow, the fluid medium merges into the swirl chamber, and the fluid medium continues to swirl in the swirl chamber, so that it enters the nozzle hole at the moment the ball is lifted, realizing atomization and achieving better effect. Furthermore, the swirl chamber is designed to be a first frustum chamber, a second cylindrical chamber, a first frustum chamber and a first inverted frustum chamber which are interconnected. The diameter of the second cylindrical chamber is larger than that of the first cylindrical chamber. At this time, the swirl chamber space becomes larger, and the chamber wall is set in a circular shape. In this space, through the swirl of the fluid medium, when the space becomes larger, a disguised pressurization is achieved, that is, when the sphere is sealed, the same pressure is achieved in the enlarged space. At this time, when the sphere is lifted, the fluid medium instantly enters the nozzle hole along the gap between the sphere and the wall of the first sealed chamber. The capacity of the large space avoids the untimely supply of the fluid medium during the time period of sphere lifting and sealing. The function of disguised pressurization is achieved by expanding the space, and then the atomization is enhanced in combination with the swirl of the fluid medium.

[0015] (3) In the valve seat of the present invention, the number of the guide holes is 6, and the 6 guide holes are evenly arranged. The above number is the optimal setting.

[0016] (4) In the valve seat of the present invention, the guide hole is arranged obliquely downward from the axial section of the first cylindrical cavity. The above arrangement will maximize the possibility of the fluid medium rotating in the vortex cavity, reduce obstacles, and provide an optimal structure for achieving rapid vortex.

[0017] (5) The valve seat of the present invention further realizes the supply of fluid medium while swirling through the two-stage setting of the guide hole with a larger front and a smaller rear, thereby ensuring the atomization effect while ensuring the pressure increase.

[0018] (6) In the valve seat of the present invention, the nozzle hole is arranged obliquely, and this arrangement further cooperates with the swirling fluid medium to achieve a better atomization effect.

[0019] (7) The spiral oblique-entry nozzle of the present invention uses the above-mentioned valve seat to reduce the residual fluid medium, thereby reducing the hardening and drying of impurities to block the nozzle hole and affect the atomization effect; at the same time, the atomization effect is enhanced by increasing the pressure through the expansion of the vortex space of the fluid medium. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the technical solutions in the specific implementation modes of the present invention, the following briefly introduces the drawings required for use in the specific implementation modes. Obviously, the drawings described below are some implementation modes of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0021] Figure 1 is a front view of the valve seat of the present invention;

[0022] Figure 2 yes Figure 1 A top-down perspective view of

[0023] Figure 3 yes Figure 1 A top view of

[0024] Figure 4 yes Figure 3 JJ-direction view;

[0025] Figure 5 yes Figure 3 QQ view;

[0026] Figure 6 is a three-dimensional diagram of the valve seat of the present invention;

[0027] Figure 7 It is a structural schematic diagram of the spiral oblique-entry nozzle of the present invention;

[0028] Figure 8 yes Figure 6 A magnified view of middle;

[0029] The reference numerals in the figure are as follows: 1-valve seat body; 2-first cylindrical cavity; 3-first sealing cavity; 4-nozzle hole; 5-vacuum groove; 6-table-shaped structure; 7-oblique side; 8-guide hole; 9-first conical cavity; 10-second cylindrical cavity; 11-first table cavity; 12-first inverted conical cavity; 13-second inverted conical cavity; 14-third cylindrical cavity; 15-positioning hole; 16-valve core; 17-sphere; 18-oil pipe body. DETAILED DESCRIPTION

[0030] The following is a clear and complete description of the content of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are part of the embodiments of the present invention, rather than all of the embodiments. The embodiments in the present invention and other embodiments obtained by ordinary technicians in this field without creative work are all within the scope of protection of the present invention.

[0031] Example 1

[0032] like Figure 1-6As shown, the present embodiment discloses a valve seat, which comprises: a valve seat body 1, the shape of the valve seat body 1 is not limited, as long as it can cooperate with the structure of the nozzle to realize the function of the nozzle, such as an oil pipe body. In the present embodiment, the valve seat body 1 is preferably a columnar structure, and more preferably a cylindrical structure; the valve seat body 1 is provided with a first cylindrical cavity 2, a swirl cavity, a first sealing cavity 3 and a nozzle hole 4 which are interconnected. During use, the first cylindrical cavity 2 is in sliding contact with the ball as much as possible to ensure that the valve core does not tilt when the ball slides. The swirl cavity is arranged below the first cylindrical cavity 2, and its shape is not limited. Specific limitations, can be a regular shape, can also be an irregular shape, such as a cylindrical cavity, a spherical cavity (non-integral), a frustum cavity, a combination of multiple cavities, etc. Specifically, the swirl cavity is a first frustum cavity 9, a second cylindrical cavity 10, a first stage cavity 11 and a first inverted frustum cavity 12 that are interconnected; wherein, the first frustum cavity 9 is connected to the first cylindrical cavity 2, the diameter of the second cylindrical cavity 10 is greater than the diameter of the first cylindrical cavity 2, the first inverted frustum cavity 12 is connected to the first sealed cavity 3; the shape of the first stage cavity 11 is a deformation of the frustum cavity, that is, the cavity wall is a spherical arc, so that the fluid medium moves toward Minimize obstruction when the nozzle hole flows; the shape of the first sealed cavity 3 is a frustum or a spherical cone, and the spherical cone is a deformation of the frustum, that is, the cavity wall is a spherical arc shape; the nozzle hole 4 is directly connected to the first sealed cavity 3, and the shape of the nozzle hole 4 can be a hole-like structure of an existing oil injection hole. In this embodiment, the nozzle hole 4 is a cylinder, preferably an oblique cylinder, and the angle between its axis and the vertical direction is not specifically limited, preferably 20-40 degrees; a vacuum groove 5 is formed on the cavity wall of the first sealed cavity 3 near the nozzle hole 4, and the shape of the vacuum groove 5 is not limited. Preferably, the vacuum groove 5 is an annular A groove having a triangular cross-sectional shape, two groove sides being mutually connected vertical sides and a hypotenuse, and the other end of the hypotenuse away from the vertical side being connected to the cavity wall of the nozzle hole 4; a table-like structure 6 having one end being small and the other end being large is formed on the upper part of the valve seat body 1, and the table-like structure 6 forms an oblique side surface 7, wherein the small end is the upper end surface of the valve seat body 1, and the shape of the table-like structure 6 is not specifically limited, or the oblique side surface 7 is not specifically limited, and the lines of its cross section may be straight lines, curves, broken lines or anisotropic lines, and when the table-like structure 6 is a truncated cone, the oblique side surface 7 is a side surface of the truncated cone, and at this time, the lines of its cross section are straight lines;The inclined side surface 7 is connected to the swirl chamber through at least one guide hole 8, and the shape of the guide hole 8 is not specifically limited. Preferably, the guide hole 8 includes two sections of coaxially interconnected cylindrical holes, wherein the diameter of the cylindrical hole close to the inclined side surface 7 is greater than the diameter of the cylindrical hole away from the inclined side surface 7. The number of the guide holes 8 is not specifically limited, preferably 6, evenly arranged, and the angle between the central axis of each of the guide holes 8 and the radial surface of the first cylindrical cavity 2 is greater than 0 degrees. Further, the guide hole 8 deviates from the axial section of the first cylindrical cavity 2 and is arranged obliquely downward, which means that the guide hole 8 is obliquely When tilted downward, the axis thereof is not on any axial section of the first cylindrical cavity 2. Furthermore, when the parallel line of the central axis of the first cylindrical cavity 2 intersects the central axis of the guide hole 8, the angle between the two is 30-60 degrees. In order to facilitate processing, a second inverted frustum cavity 13 and a third cylindrical cavity 14 are formed above the first cylindrical cavity 2. The diameter of the third cylindrical cavity 14 is larger than the diameter of the first cylindrical cavity 2. The top end of the cavity wall of the third cylindrical cavity 14 is chamfered. In order to make it easier for the fluid to flow into the guide hole 8, the upper end of the terrace-shaped structure 6 on the upper part of the valve seat body 1 is chamfered. ;

[0033] Among them, as a preferred embodiment, the valve seat body 1, the first cylindrical cavity 2, the first sealing cavity 3, the table-shaped structure 6, the first frustum cavity 9, the second cylindrical cavity 10, the first table cavity 11, the first inverted frustum cavity 12, the second inverted frustum cavity 13, and the third cylindrical cavity 14 are coaxially arranged.

[0034] It should be noted that a frustum-shaped hole is formed between the two cylindrical holes of the guide hole, and the frustum-shaped hole can be processed into a certain size, or it can be naturally formed by the drill bit during processing; in order to better achieve installation and processing, a positioning hole 15 can also be provided at the bottom of the valve seat body 1, and the angle structure on the valve seat can form a chamfer, which are common mechanical processing methods and will not be described one by one here.

[0035] Example 2

[0036] like Figure 7 and Figure 8 As shown, the present embodiment discloses a high-pressure oblique-entry nozzle, which includes an oil pipe body 18, the lower end of the oil pipe body 18 is sleeved with the outer side surface of the valve seat body 1 of the valve seat, so that the fluid enters the swirl chamber through the terrace structure 6 and then through the guide hole 8, so that the fluid rotates and flows downward in the swirl chamber, and then has more impact force, wherein the valve seat is the valve seat structure in Example 1; it also includes a valve core 16, the lower end of the valve core 16 is connected to a ball 17, the ball 17 can be selected from any existing shape of the ball, it can be a whole sphere or a part of the sphere, the ball 17 cooperates with the first sealing cavity 3 to realize the spray of the nozzle.

[0037] In addition, other structures of the nozzle, such as the shell, the electromagnetic lifting and lowering structure of the valve core, the oil inlet, the oil circuit and other structures can be those of the existing nozzles and will not be described in detail here.

[0038] It should be noted that the fluid medium in the present invention can be a liquid fluid such as oil, water, urea solution, etc. The nozzle of the present invention can be applicable to high and low pressure fluid media.

[0039] Obviously, the above embodiments are merely examples for the purpose of clear explanation, and are not intended to limit the implementation methods. For those skilled in the art, other different forms of changes or modifications can be made based on the above description. It is not necessary and impossible to list all the implementation methods here. The obvious changes or modifications derived therefrom are still within the scope of protection of the invention.

Claims

1. A valve seat, characterized in that: include: A valve seat body; a first cylindrical cavity, a swirl cavity, a first sealing cavity and a nozzle hole are formed in the valve seat body, and a vacuum groove is formed on the cavity wall of the first sealing cavity near the nozzle hole; a table-like structure with a small end and a large end is formed on the upper part of the valve seat body, and the table-like structure forms an inclined side surface, and the inclined side surface is connected to the swirl cavity through at least one guide hole, and at the same time, the angle between the central axis of the guide hole and the radial surface of the first cylindrical cavity is greater than 0 degrees; The swirl chamber is composed of a first frustum chamber, a second cylindrical chamber, a first cone chamber and a first inverted frustum chamber which are interconnected; wherein the diameter of the second cylindrical chamber is larger than the diameter of the first cylindrical chamber; the vacuum groove is an annular groove, and its cross-sectional shape is a triangle, and the two groove edges are a vertical edge and a hypotenuse which are connected to each other, and the other end of the hypotenuse away from the vertical edge is connected to the cavity wall of the nozzle hole.

2. The valve seat according to claim 1, characterized in that: There are 6 guide holes, which are evenly arranged.

3. The valve seat according to claim 1 or 2, characterized in that: The guide hole is arranged obliquely downward and deviates from the axial section of the first cylindrical cavity.

4. The valve seat according to claim 3, characterized in that: The guide hole comprises two sections of cylindrical holes that are interconnected, wherein the diameter of the cylindrical hole close to the oblique side surface is greater than the diameter of the cylindrical hole away from the oblique side surface.

5. The valve seat according to claim 4, characterized in that: The nozzle hole is arranged obliquely.

6. The valve seat according to claim 5, characterized in that A second inverted frustum cavity and a third cylindrical cavity are formed above the first cylindrical cavity, and the top end of the cavity wall of the third cylindrical cavity is chamfered.

7. The valve seat according to claim 6, characterized in that The upper end of the table-like structure is chamfered.

8. A high-pressure oblique-entry nozzle, characterized in that: Comprising the valve seat according to any one of claims 1 to 7.

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