Nozzle

Abstract

The utility model provides a nozzle which comprises a shell and a rotational flow piece, the shell is provided with a through hole, the through hole comprises a first mixing hole section, a second mixing hole section and a spraying hole section located between the first mixing hole section and the second mixing hole section, and the hole diameter of the first mixing hole section and the hole diameter of the second mixing hole section are both larger than the hole diameter of the spraying hole section. The rotational flow piece is located on the side, away from the spray hole section, of the first mixing hole section, a liquid inlet hole is formed in the rotational flow piece, the rotational flow piece can enable liquid entering from the liquid inlet hole to form rotational flow in the first mixing hole section, the shell is further provided with an air inlet hole, and an air outlet of the air inlet hole is formed in the inner circumferential face of the first mixing hole section. According to the nozzle, liquid can form fog drops with the small particle size, the fog drops can have the high spraying speed, and therefore the good dust suppression effect can be achieved. And an air compressor does not need to be additionally arranged to provide power for the gas, so that the energy consumption and the cost can be reduced.

Description

Technical Field

[0001] The present application relates to the technical field of dust control, and in particular to a nozzle. Background Art

[0002] Some operating steps in the material transfer process will generate dust. When dust is generated, turn on the spray dust suppression equipment, and mist droplets will be sprayed out from the nozzle of the spray dust suppression equipment. The mist droplets will combine with the raised dust and condense and fall to the ground, thereby achieving the purpose of dust suppression.

[0003] Nozzles mainly come in two forms: dual-fluid and single-fluid. At present, dual-fluid nozzles use compressed air and water, and the atomization energy mainly comes from compressed air. The disadvantage is that an additional air compressor is required to provide power for the air, which has high energy consumption and cost. In addition, the compressed air energy is limited, resulting in a low spray speed. Therefore, when falling at a high drop or when the external wind is strong, the droplets are easily blown away, so the dust suppression effect is not good. Single-fluid nozzles only use high-pressure water, and the atomization energy comes from a water pump. The disadvantage is that the droplets produced are larger in size and do not combine well with dust, resulting in poor dust suppression effect.

[0004] In view of this, how to improve the nozzle structure to enhance the dust suppression effect is a technical problem that needs to be solved by technical personnel in this field. Utility Model Content

[0005] To solve the above problems, the present application provides a nozzle, which includes a shell and a swirl member, the shell is provided with a through hole, the through hole includes a first mixing hole section, a second mixing hole section and a spray hole section located between the first mixing hole section and the second mixing hole section, the aperture of the first mixing hole section and the aperture of the second mixing hole section are both larger than the aperture of the spray hole section, the swirl member is located on the side of the first mixing hole section away from the spray hole section, the swirl member is provided with a liquid inlet hole, and the swirl member can make the liquid entering from the liquid inlet hole form a swirl in the first mixing hole section, the shell is also provided with an air inlet hole, and the air outlet of the air inlet hole is formed on the inner circumferential surface of the second mixing hole section.

[0006] In one embodiment of the nozzle, the swirl element includes a plurality of liquid inlet holes, each of which is evenly spaced around the entire circumference of the central axis of the through hole, each of the liquid inlet holes is inclined at the same angle relative to the central axis of the through hole, the liquid outlet of each of the liquid inlet holes is closer to the central axis of the through hole than the liquid inlet, the liquid outlet is formed on an end face of the swirl element close to the first mixing hole section, and the liquid inlet is formed on the other end face of the swirl element away from the first mixing hole section.

[0007] In one implementation manner of the nozzle, the range of the angle α between the central axis of each of the liquid inlet holes and the central axis of the through hole is: 20°≤α≤35°.

[0008] In one embodiment of the nozzle, an end surface of the swirl element close to the first mixing hole segment is a conical surface, and a large diameter end of the conical surface is farther away from the first mixing hole segment than a small diameter end.

[0009] In one embodiment of the nozzle, the shell is provided with a plurality of the air inlet holes, and the air inlet holes are evenly spaced around the entire circumference of the central axis of the through hole, each of the air inlet holes is inclined at the same angle relative to the central axis of the through hole, and the axial distance between the air outlet of the air inlet hole and the spray hole section is greater than the axial distance between the air inlet of the air inlet and the spray hole section.

[0010] In one implementation manner of the nozzle, the range of the angle β between the central axis of each of the air inlet holes and the central axis of the through hole is: 60°≤β≤75°.

[0011] In one embodiment of the nozzle, the nozzle comprises a filter element, and the filter element is located on a side of the swirl element away from the first mixing hole section.

[0012] In one embodiment of the nozzle, the through hole comprises a mounting hole section, the mounting hole section is located on a side of the first mixing hole section away from the spray hole section, and the swirl element and the filter element are assembled in the mounting hole section.

[0013] In one embodiment of the nozzle, the through hole further includes a first transition hole section and a second transition hole section, the first transition hole section is located between the spray hole section and the first mixing hole section, the aperture of the first transition hole section gradually decreases from the first mixing hole section to the spray hole section, the second transition hole section is located between the spray hole section and the second mixing hole section, the aperture of the second transition hole section gradually increases from the spray hole section to the second mixing hole section.

[0014] In one embodiment of the nozzle, the through hole further comprises an outlet hole section, the outlet hole section is located on a side of the second mixing hole section away from the spray hole section, and the aperture of the outlet hole section gradually increases in a direction away from the second mixing hole section.

[0015] The nozzle provided in the present application can make the liquid form droplets with smaller particle size and can make the droplets have a higher ejection speed, so as to achieve a better dust suppression effect. In addition, there is no need to configure an additional air compressor to provide power for the gas, thus reducing energy consumption and cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 A cross-sectional view of an embodiment of a nozzle provided in the present application;

[0017] Figure 2 for Figure 1 Right view of Figure 2 The filter is hidden in the

[0018] The following are the descriptions of the reference numerals:

[0019] 1 housing, 11 through hole, 111 first mixing hole section, 112 second mixing hole section, 113 spray hole section, 114 mounting hole section, 115 first transition hole section, 116 second transition hole section, 117 outlet hole section, 118 third transition hole section, 12 air inlet;

[0020] 2 swirl element, 21 liquid inlet hole;

[0021] 3 filter elements. DETAILED DESCRIPTION

[0022] In order to enable those skilled in the art to better understand the technical solution of the present application, the present application is further described in detail below in conjunction with the accompanying drawings and specific implementation methods.

[0023] like Figure 1 and Figure 2 As shown, the nozzle housing 1 and the swirl element 2 provided by the present application.

[0024] The housing 1 is provided with a through hole 11, which at least includes a first mixing hole section 111, a second mixing hole section 112 and a spray hole section 113. The spray hole section 113 is located between the first mixing hole section 111 and the second mixing hole section 112. The aperture of the first mixing hole section 111 is larger than the aperture of the spray hole section 113. The aperture of the second mixing hole section 112 is also larger than the aperture of the spray hole section 113. The housing 1 is also provided with an air inlet 12. The air outlet of the air inlet 12 is formed on the inner circumferential surface of the second mixing hole section 112. The air inlet of the air inlet can be formed on the outer circumferential surface of the housing 1.

[0025] The swirl element 2 is located on the side of the first mixing hole section 111 away from the spray hole section 113 (i.e. Figure 1 The swirl element 2 is provided with a liquid inlet hole 21, through which liquid can enter the interior of the housing 1. The swirl element 2 can make the liquid entering from the liquid inlet hole 21 form a swirl in the first mixing hole section 111.

[0026] When the nozzle of the above structure is working, liquid (such as water) enters the liquid inlet hole 21, and then accelerates into the first mixing hole section 111 from the liquid outlet of the liquid inlet hole 21. Under the swirl effect of the swirl element 2, the liquid forms a swirl in the first mixing hole section 111, and the liquid flow is accelerated due to the swirl effect. Then, the vortex-shaped accelerated liquid flow further enters the spray hole section 113. Since the aperture of the spray hole section 113 is smaller than the aperture of the first mixing hole section 111, the liquid flow is accelerated again due to the reduction of the flow area, and then The accelerated liquid flow further enters the second mixing hole section 112. Since the aperture of the second mixing hole section 112 is larger than the spray hole section 113, a negative pressure is generated near the outlet of the spray hole section 113 at the moment when the liquid flow enters the second mixing hole section 112 from the spray hole section 113, so that gas (such as air) is sucked into the second mixing hole section 112. The incoming gas collides with the liquid flow in the second mixing hole section 112, so that the liquid flow is broken into small-size droplets. Due to the above-mentioned multiple acceleration effects, the droplets can be sprayed out at high speed.

[0027] It can be seen that the nozzle of the above structure can make the liquid form droplets with smaller particle size and can make the droplets have a higher spraying speed. The smaller the droplet size, the greater the possibility of agglomeration with dust, and the better the dust suppression effect. The higher the spraying speed, the stronger the ability of the droplets to resist wind, the less likely the droplets are to be blown away, and the better the dust suppression effect. Therefore, the nozzle of the above structure can achieve a better dust suppression effect.

[0028] In addition, the nozzle of the above structure uses the negative pressure near the outlet of the spray hole section 113 to suck the gas into the nozzle. Compared with the traditional two-fluid nozzle, there is no need to configure an additional air compressor to provide power for the gas, thereby reducing energy consumption and cost.

[0029] In one embodiment, the nozzle further comprises a filter element 3, and the filter element 3 is located on a side of the swirl element 2 away from the first mixing hole section 111 (i.e. Figure 1 The liquid first passes through the filter 3 before entering the liquid inlet hole 21 of the swirl element 2, and the filter 3 filters out impurities in the liquid to prevent the impurities from clogging the nozzle, thereby extending the service life and life of the nozzle. The filter 3 can be a mesh structure made of steel wire, of course, it can also be other structures with filtering functions, such as a woven mesh structure or a filter membrane filter cloth structure.

[0030] In one embodiment, the through hole 11 includes a mounting hole section 114, and the mounting hole section 114 is located on a side of the first mixing hole section 111 away from the spray hole section 113 (i.e. Figure 1On the right side of the first mixing hole section 111 in the installation hole section 114), the swirl element 2 and the filter element 3 are assembled in the installation hole section 114. A more convenient assembly method is to first assemble the swirl element 2 and the filter element 3 together (for example, weld them together), and then assemble the assembly in the installation hole section 114. After the swirl element 2 and the filter element 3 are assembled in the installation hole section 114, the outer periphery of the swirl element 2 and the filter element 3 fits tightly with the inner periphery of the installation hole section 114 without any gap, so as to prevent liquid from passing through the outer periphery of the swirl element 2 and the filter element 3. A limiting step can be set in the installation hole section 114, and the limiting step is aligned with one end face of the swirl element 2 ( Figure 1 The left end surface of the middle swirl member 2 is abutted against to limit the swirl member 2.

[0031] In one embodiment, the swirl element 2 includes a plurality of liquid inlet holes 21, where a plurality refers to two or more than two. In the illustrated embodiment, the swirl element 2 is provided with three liquid inlet holes 21. The liquid inlet holes 21 are evenly spaced around the entire circumference of the central axis of the through hole 11. For example, when three liquid inlet holes 21 are provided, the spacing angle between the three is 120°. Each liquid inlet hole 21 is inclined at the same angle relative to the central axis of the through hole 11. The liquid outlet of each liquid inlet hole 21 is closer to the central axis of the through hole 11 than the liquid inlet. The liquid outlet is formed on an end face of the swirl element 2 close to the first mixing hole section 111 (i.e. Figure 1 The liquid inlet is formed on the other end face of the swirl member 2 away from the first mixing hole section 111 (i.e. Figure 1 The right end face of the swirl element 2 in the middle). With this design, when the nozzle is working, the liquid is sprayed obliquely from the multiple liquid inlet holes 21 into the first mixing hole section 111, and interacts with each other in the first mixing hole section 111 to form an orderly vortex liquid flow. The swirl element 2 of this structure is simple in structure and has a good swirl effect. Of course, the swirl element 2 can also be designed as other structures, such as a volute structure.

[0032] Preferably, the angle α between the central axis of each of the liquid inlet holes 21 and the central axis of the through hole 11 is in the range of 20°≤α≤35°, which is conducive to forming a stable and orderly vortex liquid flow.

[0033] In one embodiment, the housing 1 is provided with a plurality of air inlet holes 12, wherein the term "plurality" refers to two or more than two. In the illustrated embodiment, the housing 1 is provided with three air inlet holes 12. The air inlet holes 12 are evenly spaced around the entire circumference of the central axis of the through hole 11. For example, when three air inlet holes 12 are provided, the interval angle between the three is 120°. Each air inlet hole 12 is tilted at the same angle relative to the central axis of the through hole 11. The axial distance between the air outlet of each air inlet hole 12 and the spray hole section 113 is greater than the axial distance between its air inlet and the spray hole section 113. With such a design, when the nozzle is working, the gas tilts from the plurality of air inlet holes 12 into the second mixing hole section 112, interacts with each other in the second mixing hole section 112, and forms an orderly vortex-shaped airflow, which can further accelerate the liquid flow, further improve the spraying speed of the droplets, and further improve the dust suppression effect. In the illustrated embodiment, when the inlet pressure is 8 MPa, the spray velocity of the droplets can reach more than 50 m / s.

[0034] Preferably, the angle β between the central axis of each air inlet 12 and the central axis of the through hole 11 is in the range of 60°≤β≤75°. This range can not only form a stable and orderly vortex-shaped airflow to accelerate the liquid flow, but also ensure that the airflow fully collides with the liquid flow to reduce the droplet size.

[0035] In one embodiment, the swirl element 2 is close to an end surface of the first mixing hole section 111 (i.e. Figure 1 The left end face of the middle swirl element 2 is a conical surface, and the large diameter end of the conical surface is farther away from the first mixing hole section 111 ( Figure 1 The large diameter end of the middle conical surface is on the right, and the small diameter end is on the left). In this way, the conical surface can play a guiding role, which is more conducive to forming a stable and orderly vortex liquid flow.

[0036] In one embodiment, the through hole 11 includes a first transition hole section 115. The first transition hole section 115 is located between the spray hole section 113 and the first mixing hole section 111. The aperture of the first transition hole section 115 increases from the first mixing hole section 111 to the spray hole section 113 ( Figure 1 The first transition hole section 115 and the first mixing hole section 111 have substantially the same aperture at the docking position. The first transition hole section 115 and the spray hole section 113 have substantially the same aperture at the docking position. The inner circumference of the first transition hole section 115 plays a flow collecting role, so that the liquid flow can flow from the first mixing hole section 111 to the spray hole section 113 more quickly and with less kinetic energy loss, thereby facilitating the increase of the droplet spraying speed.

[0037] In one embodiment, the through hole 11 includes a second transition hole section 116. The second transition hole section 116 is located between the spray hole section 113 and the second mixing hole section 112. The aperture of the second transition hole section 116 increases from the spray hole section 113 to the second mixing hole section 112 ( Figure 1 The second transition hole section 116 and the second mixing hole section 112 have substantially the same aperture at the docking position. The second transition hole section 116 and the spray hole section 113 have substantially the same aperture at the docking position. The inner circumference of the second transition hole section 116 plays a role in expanding the flow, so that the liquid flow can be closer to the outlet of the air inlet 12 after entering the second mixing hole section 112, so that it can collide with the air flow more fully and more intensely, thereby facilitating the refinement of the droplet particle size.

[0038] In one embodiment, the through hole 11 includes an outlet hole section 117, and the outlet hole section 117 is located on a side of the second mixing hole section 112 away from the spray hole section 113 (i.e. Figure 1 The diameter of the outlet hole section 117 is along the direction away from the second mixing hole section 112 (i.e. Figure 1 The inner circumference of the outlet hole section 117 can expand the spray area of ​​the droplets, which is beneficial to improving the dust suppression effect.

[0039] In one embodiment, a third transition hole section 118 is included. The third transition hole section 118 is located between the mounting hole section 114 and the first mixing hole section 111, and the diameter of the third transition hole section 118 increases from the mounting hole section 114 to the first mixing hole section 111 (i.e. Figure 1 The third transition hole section 118 gradually narrows from right to left, and the aperture of the docking position of the third transition hole section 118 is substantially consistent with that of the mounting hole section 114. The aperture of the docking position of the third transition hole section 118 is substantially consistent with that of the first mixing hole section 111. The inner circumference of the third transition hole section 118 can play a guiding role, which is more conducive to forming a stable and orderly vortex liquid flow.

[0040] In one embodiment, the outer periphery of the housing 1 is provided with external threads, which can be screwed into the connection hole on the main body of the spray dust suppression system. A limiting step can also be provided on the outer periphery of the housing 1 to limit the screwing distance of the housing 1.

[0041] The above embodiments can be freely combined without conflict. In addition, in practical application, the droplets can reach the target spraying speed and target particle size by adjusting the aperture of each hole segment of the through hole 11, the aperture and number of the air inlet holes 12, the aperture and number of the liquid inlet holes 21, the inlet pressure, etc.

[0042] The above specific examples are used to illustrate the principles and implementation methods of the present application. The description of the above embodiments is only used to help understand the method and core ideas of the present application. It should be pointed out that for ordinary technicians in this technical field, without departing from the principles of the present application, several improvements and modifications can be made to the present application, and these improvements and modifications also fall within the scope of protection of the claims of the present application.

Claims

1. A nozzle, characterized in that: The nozzle comprises a shell (1) and a swirl member (2); the shell (1) is provided with a through hole (11); the through hole (11) comprises a first mixing hole section (111), a second mixing hole section (112) and a spray hole section (113) located between the first mixing hole section (111) and the second mixing hole section (112); the apertures of the first mixing hole section (111) and the second mixing hole section (112) are both larger than the aperture of the spray hole section (113); the swirl member (2) is located on a side of the first mixing hole section (111) away from the spray hole section (113); the swirl member (2) is provided with a liquid inlet hole (21); the swirl member (2) can cause liquid entering from the liquid inlet hole (21) to form a swirl in the first mixing hole section (111); the shell (1) is also provided with an air inlet hole (12); an air outlet of the air inlet hole (12) is formed on the inner circumferential surface of the second mixing hole section (112).

2. The nozzle according to claim 1, characterized in that The swirl element (2) comprises a plurality of liquid inlet holes (21), each of the liquid inlet holes (21) being evenly spaced around the entire circumference of the central axis of the through hole (11), each of the liquid inlet holes (21) being inclined at the same angle relative to the central axis of the through hole (11), a liquid outlet of each of the liquid inlet holes (21) being closer to the central axis of the through hole (11) than a liquid inlet, the liquid outlet being formed on an end surface of the swirl element (2) close to the first mixing hole section (111), and the liquid inlet being formed on the other end surface of the swirl element (2) away from the first mixing hole section (111).

3. The nozzle according to claim 2, characterized in that The range of the angle α between the central axis of each of the liquid inlet holes (21) and the central axis of the through hole (11) is: 20°≤α≤35°.

4. The nozzle according to claim 2, characterized in that An end surface of the swirl element (2) close to the first mixing hole section (111) is a conical surface, and the large-diameter end of the conical surface is farther away from the first mixing hole section (111) than the small-diameter end.

5. The nozzle according to any one of claims 1 to 4, characterized in that: The housing (1) is provided with a plurality of air inlet holes (12), each of the air inlet holes (12) being evenly spaced around the entire circumference of the central axis of the through hole (11), each of the air inlet holes (12) being inclined at the same angle relative to the central axis of the through hole (11), and an axial distance between an air outlet of the air inlet hole (12) and the spray hole section (113) being greater than an axial distance between an air inlet of the air inlet hole (12) and the spray hole section (113).

6. The nozzle according to claim 5, characterized in that The range of the angle β between the central axis of each air inlet hole (12) and the central axis of the through hole (11) is: 60°≤β≤75°.

7. The nozzle according to any one of claims 1 to 4, characterized in that The nozzle comprises a filter element (3), and the filter element (3) is located on a side of the swirl element (2) away from the first mixing hole section (111).

8. The nozzle according to claim 7, characterized in that The through hole (11) comprises a mounting hole section (114), the mounting hole section (114) being located on a side of the first mixing hole section (111) away from the spray hole section (113), and the swirl element (2) and the filter element (3) being assembled in the mounting hole section (114).

9. The nozzle according to claim 8, characterized in that The through hole (11) further comprises a first transition hole section (115) and a second transition hole section (116); the first transition hole section (115) is located between the spray hole section (113) and the first mixing hole section (111); the aperture of the first transition hole section (115) gradually decreases from the first mixing hole section (111) to the spray hole section (113); the second transition hole section (116) is located between the spray hole section (113) and the second mixing hole section (112); the aperture of the second transition hole section (116) gradually increases from the spray hole section (113) to the second mixing hole section (112).

10. The nozzle according to any one of claims 1 to 4, characterized in that: The through hole (11) further comprises an outlet hole section (117), the outlet hole section (117) being located on a side of the second mixing hole section (112) away from the spray hole section (113), and the hole diameter of the outlet hole section (117) gradually increases in a direction away from the second mixing hole section (112).

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