Fluid atomizing mechanical nozzle

Abstract

A fluid atomizing mechanical nozzle, relating to a nozzle, comprising a valve body with a fluid inlet, a liquid passing sheet, a spring, a valve needle, a swirl seat, and a valve seat. A valve needle through hole Ⅰ is provided in the middle of the liquid passing sheet. The front end of the swirl seat has a counterbore, which is sleeved on the rear end of the valve seat. A valve needle through hole Ⅱ is provided in the middle of the rear end of the swirl seat, and swirl holes are evenly distributed around the valve needle through hole Ⅱ. The valve needle through hole Ⅱ and the swirl holes are respectively communicated with the counterbore; the spring is installed between the bottom end of the liquid passing sheet and the swirl seat; a swirl chamber Ⅲ communicated with the swirl holes of the swirl seat is further provided at the rear end of the valve seat, and the swirl chamber Ⅲ is communicated with the swirl chamber Ⅰ at the front end of the valve seat. Through the change of pressure difference and the centrifugal action, the present invention improves the conical atomization effect of the fluid, increases the atomization angle and area, can work stably in high-temperature and high-speed gases for a long time, effectively prevents the fluid from blocking the spray holes due to high-temperature coking, and thus prolongs the service life of the product.

Description

Technical Field

[0001] The present invention relates to a nozzle, in particular to a fluid atomizing mechanical nozzle. Background Art

[0002] Diesel particulate matter and diesel exhaust pollutants are increasingly polluting the earth's environment and affecting human health. Since Stage VI, DPF has been used to control soot particulate emissions. The particulate matter in the original system accumulates in the particulate filter, which will cause the exhaust back pressure of the diesel engine to increase. When the exhaust back pressure reaches a certain level, the performance of the diesel engine begins to deteriorate. Therefore, it is necessary to regularly remove the carbon soot particles to restore the particulate filter to its original working state. Therefore, a DPF (Diesel Particulate Filter) is added to the National VI system to capture and collect the carbon soot particles, and then a mechanical nozzle is added as the main component of the injection system to burn the collected carbon soot and other substances. At present, the mechanical nozzle has become a part of the DPF injection system, which can meet the requirements of the National VI emission regulations and effectively reduce the content of carbon soot particulate matter in the exhaust pollutants. However, the currently used mechanical nozzles cannot meet the requirements of atomization quality, atomization angle, and atomization area. The invention patent with the authorization announcement number of "CN207178000U" discloses a fuel nozzle for a DPF regeneration system. The sealing form between the valve stem and the valve seat of this nozzle helps to prevent carbon deposition. However, this nozzle still has the following disadvantages: (1) There is a risk of poor atomization; (2) There is a risk of unstable flow rate; (3) The injection angle cannot be adjusted; (4) There is a risk of flow rate fluctuation caused by the side holes being blocked by the spring. Summary of the Invention

[0003] The technical problem to be solved by the present invention is to provide a fluid atomizing mechanical nozzle to ensure the atomization effect, atomization angle, atomization area, and flow rate accuracy of the fluid, so that the atomizing mechanical nozzle can work effectively in high-temperature and high-speed gases for a long time.

[0004] The solution to the above technical problem is: A fluid atomizing mechanical nozzle includes a valve body with a fluid inlet, a spring, a valve needle, and a valve seat. The valve seat is installed at the front end of the valve body, and the valve needle is installed in the valve seat and can slide up and down in the valve seat. The front end of the valve needle is in sealing cooperation with the swirl chamber Ⅰ at the front end of the valve seat. The fluid atomizing mechanical nozzle further includes a liquid passing sheet and a swirl seat. The middle of the liquid passing sheet is provided with a valve needle through hole Ⅰ. The front end of the swirl seat has a counterbore, which is sleeved at the rear end of the valve seat. The middle of the rear end of the swirl seat is provided with a valve needle through hole Ⅱ, and swirl holes are evenly distributed around the valve needle through hole Ⅱ. The valve needle through hole Ⅱ and the swirl holes are respectively communicated with the counterbore. The spring is installed between the bottom end of the liquid passing sheet and the swirl seat. The rear end of the valve seat is also provided with a swirl chamber Ⅲ communicated with the swirl holes of the swirl seat, and the swirl chamber Ⅲ is communicated with the swirl chamber Ⅰ at the front end of the valve seat.

[0005] A further technical solution of the present invention is that a spring installation step Ⅰ is provided at the bottom end of the liquid passing sheet, and a spring installation step Ⅱ is provided on the outer circumferential surface at the rear end of the swirl seat. The spring is installed between the spring installation step Ⅰ and the spring installation step Ⅱ.

[0006] A further technical solution of the present invention is that a valve needle automatic centering groove is further provided on the outer circumference of the valve needle through hole Ⅰ in the middle of the liquid passing sheet. The valve needle automatic centering groove is a V-shaped groove or an inner spherical surface groove.

[0007] A further technical solution of the present invention is that the liquid passing sheet is also provided with a first notch extending radially through the outer circumference of the liquid passing sheet and the valve needle through hole Ⅰ.

[0008] A further technical solution of the present invention is that the first notch is a long strip-shaped through groove.

[0009] A further technical solution of the present invention is that the liquid passing sheet is also provided with a second notch on its outer circumference. The second notch is an arc-shaped notch.

[0010] A further technical solution of the present invention is that the swirl chamber Ⅲ of the valve seat is a conical surface or an inner spherical surface structure, and a communicating swirl chamber Ⅱ is also provided between the swirl chamber Ⅲ and the swirl chamber Ⅰ.

[0011] A further technical solution of the present invention is that the swirl chamber Ⅰ at the front end of the valve seat is a conical surface or an inner spherical surface structure; the front end of the valve needle is provided with a conical surface or an outer spherical surface structure that matches the swirl chamber Ⅰ.

[0012] A further technical solution of the present invention is that the clearance value of the mating surface between the swirl chamber Ⅰ at the front end of the valve seat and the front end of the valve needle is between 0 and 5 mm, and different spray angles can be adjusted by adjusting different clearance values.

[0013] A further technical solution of the present invention is that a metal filter screen is installed in the fluid inlet of the valve body. The metal filter screen is a stainless steel filter screen.

[0014] Due to the adoption of the above structure, compared with the prior art, the fluid atomizing mechanical nozzle of the present invention has the following beneficial effects:

[0015] 1. Ensure the atomization effect of the fluid

[0016] The present invention comprises a valve body with a fluid inlet, a spring, a valve needle, a valve seat, a fluid passage plate, and a swirl seat. The front end of the swirl seat has a countersunk hole that is sleeved onto the rear end of the valve seat. A valve needle through-hole II is provided in the middle of the rear end of the swirl seat, and swirl holes are evenly distributed around the valve needle through-hole II. The valve needle through-hole II and the swirl holes are each connected to the countersunk hole. The rear end of the valve seat also has a swirl chamber III that is connected to the swirl hole of the swirl seat. This swirl chamber III is also connected to the swirl chamber I at the front end of the valve seat. During operation, fluid flows through the swirl hole of the swirl seat to the swirl chamber of the valve seat for mixing and acceleration. The centrifugal force of the fluid is then increased by the force of the three swirl chambers. In this structure, the greater the force applied to the fluid, the better the atomization effect. The valve needle is pushed to overcome the spring and open the valve to produce a conical atomized spray.

[0017] In addition, the valve seat of the present invention does not need to be provided with side holes, thereby preventing the side holes from being blocked by the spring after the valve needle opens at high flow rates, causing flow fluctuations and affecting the atomization quality of the product.

[0018] 2. Guaranteed spray angle and spray area

[0019] The valve seat conical surface or inner spherical surface structure and the valve needle outer spherical surface or conical surface structure provided at the front end of the nozzle of the present invention can be adjusted in coordination. By adjusting different gap values, the injection angle can be adjusted, thereby ensuring the adjustment of the injection angle and injection area.

[0020] 3. Ensure fluid flow accuracy

[0021] The valve seat of the present invention does not need to be provided with side holes, which not only can omit the step of processing the side holes during processing, but also can prevent the side holes of the valve seat from restricting the sliding of the valve stem due to burrs and affecting the flow accuracy.

[0022] 4. Enhance the effectiveness

[0023] The present invention can improve the atomization quality of the sprayed fluid, increase the spray angle, increase the spray area and other effects, so that the sprayed fluid can effectively and fully react, thereby enhancing the effect.

[0024] 5. Able to work stably for a long time in high temperature and high speed gas

[0025] The present invention increases the flow rate of the fluid through the swirl structure to quickly remove heat, so that the mechanical nozzle can work stably for a long time in high-temperature, high-speed gas, effectively preventing the fluid from clogging the spray hole due to high-temperature gelation, and extending the service life of the product.

[0026] 6. Good sealing effect

[0027] The front end of the atomizing mechanical nozzle of the present invention is provided with a valve seat conical surface or spherical surface structure and a valve needle spherical surface or conical surface structure, which can play a role in liquid sealing; in addition, a metal filter screen is installed in the fluid inlet of the valve body of the present invention. Compared with the cloth filter screen of the prior art, the metal filter screen is not easy to fall off and damage, and its sealing effect is better.

[0028] 7. It can solve the problem of poor consistency of atomization quality and flow rate when the valve needle opens and closes

[0029] The flow-through piece of the present invention is provided with a first notch and a second notch. When the flow-through piece slides under hydraulic pressure on the valve needle, it can maintain balanced sliding left and right, reducing the problem that the sliding friction of the flow-through piece increases due to the lateral force when unilateral force is applied, which affects the consistency of atomization quality and flow rate when the valve needle opens and closes.

[0030] 8. The structure is reliable

[0031] The bottom end of the liquid passing piece of the present invention is provided with a spring installation step Ⅰ, and the outer circumferential surface of the rear end of the swirl seat is provided with a spring installation step Ⅱ. The spring is installed between the spring installation step Ⅰ and the spring installation step Ⅱ, and the flow rate can be adjusted by adjusting the spring force of the spring.

[0032] The liquid passing piece of the present invention is also provided with a valve needle automatic centering groove on the outer circumference of the valve needle through hole Ⅰ, and the valve needle automatic centering groove can make the valve needle automatically find the center and position.

[0033] Therefore, the structure of the present invention is relatively reliable.

[0034] 9. Prevent liquid leakage, high-temperature coking and jamming of the valve needle

[0035] The atomizing mechanical nozzle of the present invention is sealed by a conical surface, which can prevent liquid leakage, high-temperature coking and jamming of the valve needle.

[0036] Next, in combination with the drawings and embodiments, the technical features of the fluid atomizing mechanical nozzle of the present invention will be further described. Description of the Drawings

[0037] Figure 1 : Schematic structural diagram of the fluid atomizing mechanical nozzle of the present invention;

[0038] Figure 2 : Figure 1 Enlarged view of part A of

[0039] Figure 3 : Figure 4 Bottom view of

[0040] Figure 4 : Main view cross-sectional view of the liquid passing piece described in the first embodiment;

[0041] Figure 5: Front view cross-sectional view of the swirl seat described in Embodiment 1;

[0042] Figure 6 : Figure 5 Top view of;

[0043] Figure 7 : Structural schematic diagram of the valve needle described in Embodiment 1;

[0044] Figure 8 : Structural schematic diagram of the valve seat described in Embodiment 1;

[0045] In the above-mentioned drawings, the reference numerals are explained as follows:

[0046] 1 - Metal filter screen,

[0047] 2 - Valve body,

[0048] 3 - Liquid passing sheet, 301 - Valve needle through hole Ⅰ, 302 - Spring installation step Ⅰ,

[0049] 303 - Valve needle automatic centering groove, 304 - First notch, 305 - Second notch,

[0050] 4 - Spring,

[0051] 5 - Valve needle,

[0052] 6 - Swirl seat, 601 - Counterbore, 602 - Valve needle through hole Ⅱ, 603 - Swirl hole, 604 - Spring installation step Ⅱ,

[0053] 7 - Valve seat, 701 - Swirl chamber Ⅰ, 701 - Swirl chamber Ⅱ, 703 - Swirl chamber Ⅲ,

[0054] Q - Front end direction, H - Rear end direction. Detailed implementation method

[0055] Embodiment 1

[0056] Figure 1 Disclosed in is a fluid atomization mechanical nozzle, including a valve body 2 with a fluid inlet, a liquid passing sheet 3, a spring 4, a valve needle 5, a swirl seat 6, and a valve seat 7, where:

[0057] A metal filter screen 1 is installed in the fluid inlet of the valve body 2, and the metal filter screen 1 is a stainless steel filter screen.

[0058] The described valve seat 7 is installed at the front end of the valve body 2. The valve needle 5 is installed inside the valve seat 7 and can slide up and down within the valve seat 7. A swirl chamber I 701 is provided at the front end of the valve seat 7, and this swirl chamber I 701 has a conical structure. The front end of the valve needle 5 is provided with an outer spherical surface structure that cooperates with the swirl chamber I 701. The outer spherical surface structure at the front end of the valve needle 5 is in sealing cooperation with the swirl chamber I 701 at the front end of the valve seat 7. The clearance value between the conical surface of the swirl chamber I 701 at the front end of the valve seat 7 and the outer spherical surface at the front end of the valve needle 5 is between 0 and 5 mm. By adjusting different clearance values, different spray angles can be adjusted.

[0059] A valve needle through hole I 301 is provided in the middle of the liquid passing sheet 3, and a valve needle automatic centering groove 303 is further provided on the outer periphery of the valve needle through hole I 301. This valve needle automatic centering groove 303 is a V-shaped groove. This valve needle automatic centering groove 303 can enable the valve needle 5 to automatically find the center and position itself. The liquid passing sheet 3 is also provided with a first notch 304 that penetrates the outer periphery of the liquid passing sheet and the valve needle through hole I 301 along the radial direction. This first notch 304 is a long strip-shaped through groove. The liquid passing sheet 3 is also provided with a second notch 305 on its outer periphery. This second notch 305 is an arc-shaped notch. The first notch 304 and the second notch 305 can still maintain the balance and guidance of the valve needle 5 under the action of the liquid. A spring installation step I 302 is provided at the bottom end of the liquid passing sheet 3.

[0060] The front end of the described swirl seat 6 has a counterbore 601, and this counterbore 601 is sleeved on the rear end of the valve seat 7. A valve needle through hole II 602 is provided in the middle of the rear end of the swirl seat 6, and swirl holes 603 are evenly distributed around the valve needle through hole II 602. The swirl holes 603 of the swirl seat 6 are round holes. The valve needle through hole II 602 and the swirl holes 603 are respectively communicated with the counterbore 601. A spring installation step II 604 is provided on the outer circular surface at the rear end of the swirl seat 6. The described spring 4 is installed between the spring installation step I 302 and the spring installation step II 604. By adjusting the spring force of the spring 4, the flow rate can be adjusted.

[0061] The rear end of the described valve seat 7 is also provided with a swirl chamber III 703 that is communicated with the swirl holes 603 of the swirl seat 6. This swirl chamber III 703 has an inverted conical structure or an inner spherical surface structure. A swirl chamber II 702 that is communicated with each other is also provided between the swirl chamber III 703 and the swirl chamber I 701. The liquid passes through the swirl holes 601 of the swirl seat 6 and flows through the swirl chamber III 703, the swirl chamber II 702, and the swirl chamber I 701 for mixing, which can accelerate the pushing of the valve needle 5 to overcome the spring and open the valve for atomizing injection.

[0062] As a variation of the first embodiment, the swirl chamber I 701 may also be an inner spherical surface structure; the front end of the valve needle 5 may also be a conical surface structure. The cooperation mode between the swirl chamber I 701 at the front end of the valve seat 7 and the front end of the valve needle 5 may be that the conical surface structure of the swirl chamber I 701 cooperates with the conical surface or outer spherical surface structure at the front end of the valve needle 5, or the inner spherical surface structure of the swirl chamber I 701 cooperates with the conical surface or outer spherical surface structure at the front end of the valve needle 5.

[0063] As another variation of the first embodiment, the automatic centering groove 303 of the valve needle may also be an inner spherical surface groove.

[0064] As another variation of the first embodiment, the swirl holes 603 of the swirl seat 6 may be elliptical holes, square grooves, straight holes, inclined holes, inclined grooves, etc.

Claims

1. A fluid atomizing mechanical nozzle, comprising a valve body (2) with a fluid inlet, a spring (4), a valve needle (5), and a valve seat (7). The valve seat (7) is installed at the front end of the valve body (2), the valve needle (5) is installed in the valve seat (7) and can slide up and down in the valve seat (7), and the front end of the valve needle (5) is in sealing cooperation with the swirl chamber I (701) at the front end of the valve seat (7); it is characterized in that: The described fluid atomization mechanical nozzle further includes a liquid passing sheet (3) and a swirl seat (6). A valve needle through hole I (301) is provided in the middle of the liquid passing sheet (3). The front end of the swirl seat (6) has a counterbore (601) which is sleeved on the rear end of the valve seat (7). A valve needle through hole II (602) is provided in the middle of the rear end of the swirl seat (6), and swirl holes (603) are evenly distributed around the valve needle through hole II (602). The valve needle through hole II (602) and the swirl holes (603) are respectively communicated with the counterbore (601). The spring (4) is installed between the bottom end of the liquid passing sheet (3) and the swirl seat (6). A swirl chamber III (703) communicated with the swirl holes (603) of the swirl seat (6) is further provided at the rear end of the valve seat (7), and the swirl chamber III (703) is communicated with the swirl chamber I (701) at the front end of the valve seat (7). A valve needle automatic centering groove (303) is further provided on the outer periphery of the valve needle through hole I (301) in the middle of the liquid passing sheet (3). The liquid passing sheet (3) is also provided with a first notch (304) radially penetrating through the outer periphery of the liquid passing sheet and the valve needle through hole I (301). The liquid passing sheet (3) is also provided with a second notch (305) on its outer periphery.

2. The fluid atomizing mechanical nozzle according to claim 1, characterized in that: A spring installation step I (302) is provided at the bottom end of the liquid passing sheet (3), and a spring installation step II (604) is provided on the outer circumferential surface of the rear end of the swirl seat (6). The spring (4) is installed between the spring installation step I (302) and the spring installation step II (604).

3. The fluid atomizing mechanical nozzle according to claim 1, wherein: The valve needle automatic centering groove (303) is a V-shaped groove or an inner spherical surface groove.

4. The fluid atomizing mechanical nozzle according to claim 1, characterized in that: The first notch (304) is a long strip-shaped through groove.

5. The fluid atomizing mechanical nozzle according to claim 4, wherein: The second notch (305) is an arc-shaped notch.

6. The fluid atomizing mechanical nozzle according to claim 1, characterized in that: The swirl chamber III (703) of the valve seat (7) is of an inverted cone surface or inner spherical surface structure, and a swirl chamber II (702) communicated with each other is further provided between the swirl chamber III (703) and the swirl chamber I (701).

7. The fluid atomizing mechanical nozzle according to claim 1, characterized in that: The swirl chamber I (701) at the front end of the valve seat (7) is of a conical surface or inner spherical surface structure; a conical surface or outer spherical surface structure matched with the swirl chamber I (701) is provided at the front end of the valve needle (5).

8. The fluid atomizing mechanical nozzle according to claim 1, characterized in that: The clearance value of the mating surface between the swirl chamber I (701) at the front end of the valve seat (7) and the front end of the valve needle (5) is between 0 and 5 mm, and different spray angles are adjusted by adjusting different clearance values.

9. The fluid atomizing mechanical nozzle according to any one of claims 1 to 8, characterized in that: A metal filter screen (1) is installed in the fluid inlet of the valve body (2), and the metal filter screen (1) is a stainless steel filter screen.

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