Foam shield nozzle

Abstract

The invention discloses a foam shield sprayer which comprises a liquid inlet section, a foaming cavity and a liquid outlet section which are sequentially connected, a spinning disk is installed in the foaming cavity and extends in a spiral shape, a plurality of through holes are formed in the spinning disk, and at least one part of fluid sprayed into the foaming cavity from the liquid inlet section can impact on the spinning disk; the fluid impacted on the spinning disk can spirally flow towards the liquid outlet section along the spinning disk, so that the fluid in the foaming cavity is spirally disturbed and mixed; through the arrangement of the through holes, the flowing direction of part of fluid can be changed, so that the fluid in different flowing directions collides with one another, bubbles in the fluid can be cut, water and air are mixed more sufficiently, and the foaming rate is further increased.

Description

Technical Field

[0001] The invention relates to a foam shield, in particular to a foam shield nozzle. Background Art

[0002] Most of the foam shield nozzles on the market rely on brushes to generate foam. This structure will cause the foam liquid to be not fully utilized and thus cause waste. Some foam shield nozzles use filters to generate foam. After long-term use, the filter is prone to produce ditches or accumulation of some solid impurities, resulting in a decrease in the water flow rate of the filter, which seriously affects the use effect and liquid output. Summary of the invention

[0003] The present invention aims to solve at least one of the above-mentioned technical problems in the related art to a certain extent. To this end, the present invention provides a foam shield spray head.

[0004] To achieve the above object, the technical solution of the present invention is as follows:

[0005] The foam shield nozzle according to the first aspect of the present invention comprises a liquid inlet section, a foaming chamber and a liquid outlet section connected in sequence, a swirl sheet is installed in the foaming chamber, the swirl sheet extends in a spiral shape, and a plurality of through holes are provided on the swirl sheet, and at least a portion of the fluid sprayed from the liquid inlet section into the foaming chamber can impact on the swirl sheet.

[0006] The foam shield nozzle according to the embodiment of the present invention has at least the following beneficial effects: the fluid impacting the swirl sheet can flow in a spiral direction along the swirl sheet toward the liquid outlet section, and the fluid in the foaming chamber is spirally disturbed and mixed; the provision of the through holes can change the flow direction of part of the fluid so that fluids in different flow directions collide with each other, and can also cut the bubbles in the fluid, so that the water-gas mixing is more complete, and the foaming rate is further improved.

[0007] According to some embodiments of the present invention, the axial direction of each through hole is parallel to the axis of the swirl plate.

[0008] According to some embodiments of the present invention, the swirl sheet extends spirally around a cylindrical space, the end of the liquid inlet section connected to the foaming chamber is the water outlet end, the maximum inner diameter of the foaming chamber is larger than the inner diameter of the water outlet end, the cylindrical space is located within the axial projection range of the water outlet end, the diameter of the cylindrical space is smaller than the inner diameter of the water outlet end, and the axial projection of the edge of the water outlet end is aligned with the surface of the swirl sheet.

[0009] According to some embodiments of the present invention, the outer edge of the swirl sheet abuts against the inner wall of the foaming cavity, or there is a gap between the outer edge of the swirl sheet and the inner wall of the foaming cavity.

[0010] According to some embodiments of the present invention, a first hole shoulder is formed at the transition position between the liquid outlet section and the foaming cavity, a second hole shoulder is formed at the transition position between the water outlet end and the foaming cavity, and the swirl sheet is axially clamped between the first hole shoulder and the second hole shoulder.

[0011] According to some embodiments of the present invention, the inner diameter of the water outlet end is larger than the minimum inner diameter of the liquid outlet section, and the diameter of the columnar space is smaller than the minimum inner diameter of the liquid outlet section.

[0012] According to some embodiments of the present invention, a plurality of ribs are provided on the inner wall of one end of the liquid outlet section close to the swirl plate, and the ribs are spaced apart in sequence along the circumference of the liquid outlet section, and at least a portion of the ribs are located on the spiral extension path of the swirl plate.

[0013] According to some embodiments of the present invention, the liquid inlet section includes an incident zone and a Venturi channel, the Venturi channel is located between the incident zone and the foaming chamber, the negative pressure zone of the Venturi channel is provided with an air suction channel, and at least a portion of the fluid sprayed from the Venturi channel into the foaming chamber can impact on the swirl sheet.

[0014] According to some embodiments of the present invention, the Venturi channel includes a mixing zone, a flow plate, the negative pressure zone and a rectifying zone arranged in sequence along the axial direction, the mixing zone is connected to the incident zone, the flow plate is provided with a plurality of flow holes, the aperture of the flow holes is smaller than the minimum inner diameter of the mixing zone, the aperture of the flow holes is smaller than the minimum inner diameter of the negative pressure zone, the rectifying zone is connected to the foaming chamber, and the end of the rectifying zone close to the foaming chamber is the water outlet end of the Venturi channel.

[0015] According to some embodiments of the present invention, a first liquid inlet and a second liquid inlet are provided on the incident area.

[0016] According to some embodiments of the present invention, the inner diameter of the rectifying zone is smaller than the inner diameter of the negative pressure zone, and the transition position between the rectifying zone and the negative pressure zone is in a shrinking shape that gradually shrinks toward the rectifying zone.

[0017] Additional aspects and advantages of the present invention will be given in part in the following description and in part will be obvious from the following description, or will be learned through practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] The above and / or additional aspects and advantages of the present invention will become apparent and easily understood from the description of the embodiments in conjunction with the following drawings, in which:

[0019] FIG1 is a cross-sectional view of the internal structure of a foam shield nozzle;

[0020] FIG2 is a cross-sectional view of the internal structure of the foam shield nozzle from another perspective;

[0021] FIG3 is a schematic diagram of the structure of a swirl sheet;

[0022] FIG4 is a top view of the swirl plate in the axial direction;

[0023] FIG. 5 is an axial cross-sectional view of the foam shield nozzle.

[0024] Figure numerals: liquid inlet section 100; incident area (101); first liquid inlet 110; second liquid inlet 120; Venturi channel 200; water outlet 201; negative pressure area 210; suction channel 211; mixing area 220; flow plate 230; flow hole 231; rectification area 240; foaming cavity 300; liquid outlet section 400; convex rib 410; swirl sheet 500; through hole 510; cylindrical space 520; first hole shoulder 601; second hole shoulder 602. DETAILED DESCRIPTION

[0025] Embodiments of the present invention are described in detail below, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to be used to explain the present invention, and should not be construed as limiting the present invention.

[0026] The invention relates to a foam shield nozzle, comprising a liquid inlet section 100, a foaming cavity 300 and a liquid outlet section 400.

[0027] As shown in Fig. 1, Fig. 2 and Fig. 3, the foam shield nozzle can be assembled in sequence by multiple sections of pipe bodies, and the liquid inlet section 100, the foaming chamber 300 and the liquid outlet section 400 arranged in sequence are formed inside the pipe body. In this embodiment, the liquid inlet section 100, the foaming chamber 300 and the liquid outlet section 400 are coaxially arranged. External water and foaming agent enter the foam shield nozzle through the liquid inlet section 100. It can be that the liquid inlet section 100 includes an incident area 101 and a venturi channel 200. The venturi channel 200 is connected between the incident area 101 and the foaming chamber 300. The first liquid inlet 110 and the second liquid inlet 120 are provided on the incident area 101, and the first liquid inlet 110 is used to connect to the external water supply system, such as tap water. The second liquid inlet 120 is used to connect the foaming agent box. The mixed liquid formed by water and foaming agent flows from the incident area 101 to the venturi channel 200. The venturi channel 200 can be composed of a conventional entry section, a constriction section, a throat section, and a flaring section. The flaring section forms a negative pressure zone 210, and an air suction channel 211 is provided on the side wall of the tube body at the corresponding position of the negative pressure zone 210. When the mixed liquid flows in the venturi channel 200, a venturi effect is generated, and the negative pressure zone 210 in the venturi channel 200 sucks the air outside the foam shield nozzle into the negative pressure zone 210 through the air suction channel 211. The air and the mixed liquid are initially mixed in the venturi channel 200 to form a liquid-gas mixed fluid, and the foaming agent is initially foamed under the action of water-gas mixing. The fluid is sprayed from the venturi channel 200 into the foaming chamber 300. A swirl sheet 500 is installed in the foaming chamber 300, and the swirl sheet 500 can be a sheet of metal material or plastic material, and the swirl sheet 500 extends in a spiral shape. The axial direction of the swirl sheet 500 is consistent with the axial direction of the foaming chamber 300. The swirl sheet 500 is provided with a plurality of through holes 510, and the through holes 510 penetrate the swirl sheet 500 in the thickness direction. The fluid in the venturi channel 200 is sprayed toward the foaming chamber 300. After the fluid enters the foaming chamber 300, at least a portion of the fluid can impact on the swirl sheet 500. The fluid impacting the swirl sheet 500 can flow in a spiral direction along the swirl sheet 500 toward the liquid outlet section 400, and the fluid in the foaming chamber 300 is subjected to spiral disturbance and mixing. At the same time, part of the fluid will pass through each through hole 510, and the fluid passing through the through hole 510 will impact the fluid on the side of the swirl sheet 500 facing the liquid outlet section 400. The two streams of fluid collide to form foam, and different through holes 510 form different streams of water, causing the fluid to collide multiple times in the foaming chamber 300 to be fully foamed. On the one hand, the through hole 510 can change the flow direction of part of the fluid so that the fluids with different flow directions collide with each other. On the other hand, the through hole 510 can cut the bubbles in the fluid, so that the water and gas are mixed more fully, and the foaming rate is further improved. The foam finally enters the liquid outlet section 400 from the foaming chamber 300 and is discharged out for use. The fluid can be efficiently foamed in the foaming chamber 300. The formed foam will not be hindered by the filter screen provided in the prior art when entering the liquid outlet section 400 from the foaming chamber 300.

[0028] Among them, the through holes 510 on the swirl plate 500 can be oriented in different directions, that is, the axial direction of some through holes 510 can be parallel to the axial direction of the swirl plate 500, and the axial direction of some through holes 510 can intersect with the axial direction of the swirl plate 500, and the angles of intersection can be different. In this way, the various streams of fluid can intersect with each other and foam more fully. In this embodiment, the axial direction of each through hole 510 is parallel to the axis of the swirl plate 500, and the fluid flows in a directional manner after passing through each through hole 510, reducing turbulence, and ensuring that the foam can be output to the liquid outlet section 400 at a stable speed while ensuring the foaming rate.

[0029] In some specific embodiments of the present invention, as shown in Figures 2, 3, 4 and 5, the swirl sheet 500 spirally extends around a cylindrical space 520, and the cylindrical space 520 forms a passage in the axial direction of the swirl sheet 500. One end of the venturi channel 200 connected to the foaming chamber 300 is the water outlet 201. Among them, the foaming chamber 300 can be a cylindrical cavity with equal diameters at all places, or a conical cavity with a variable inner diameter. The water outlet 201 can be a cylindrical port with equal diameters at all places, or a conical port. The maximum inner diameter of the foaming chamber 300 is greater than the inner diameter of the water outlet 201. The cylindrical space 520 is located within the axial projection range of the water outlet 201. Preferably, the cylindrical space 520 and the water outlet 201 are coaxially arranged. The diameter of the cylindrical space 520 is smaller than the inner diameter of the water outlet 201, and the axial projection of the edge of the water outlet 201 is aligned with the surface of the swirl sheet 500. The fluid is sprayed into the foaming chamber 300 from the outlet end, and part of the fluid will impact the swirl plate 500, while part of the fluid will directly enter the columnar space 520. Under the spiral flow guiding action of the swirl plate 500, the fluid flowing through the columnar space 520 will also flow in a vortex-like manner; at the same time, since the axial obstruction of the fluid flowing through the columnar space 520 is relatively small, the formed foam is accelerated to flow toward the liquid outlet section 400 under the drive of the fluid flow rate in the columnar space 520. Among them, when the fluid flows along the swirl plate 500, it will impact the inner wall of the foaming chamber 300 under the centrifugal action, and the outer edge of the swirl plate 500 abuts against the inner wall of the foaming chamber 300, or there is a gap of no more than 2 mm between the outer edge of the swirl plate 500 and the inner wall of the foaming chamber 300, and the gap is preferably less than 2 mm, which can ensure that the fluid impacting the inner wall of the foaming chamber 300 continues to flow along the swirl plate 500 to mix and foam.

[0030] Further, as shown in FIG. 2 , a first hole shoulder 601 is formed at the transition position between the liquid outlet section 400 and the foaming cavity 300. A second hole shoulder 602 is formed at the transition position between the water outlet end 201 and the foaming cavity 300. The first hole shoulder 601 and the second hole shoulder 602 can be integrally formed in the tube wall, or can be formed by the ends of the tube sections when different tube sections are plugged into each other. The swirl plate 500 is clamped between the first hole shoulder 601 and the second hole shoulder 602 in the axial direction, so as to fix and install the swirl plate 500.

[0031] In some specific embodiments of the present invention, as shown in FIG1 , the liquid outlet section 400 can be a cylindrical cavity with a constant diameter at each location, or a cavity with a variable inner diameter, and the inner diameter of the water outlet end 201 is larger than the minimum inner diameter of the liquid outlet section 400. The diameter of the cylindrical space 520 is smaller than the minimum inner diameter of the liquid outlet section 400. When the fluid flows from the foaming cavity 300 to the liquid outlet section 400, part of the fluid will impact and rebound at the transition position between the foaming cavity 300 and the liquid outlet section 400, further mixing the fluid. The foam can be rectified after flowing from the water outlet end 201 through the foaming cavity 300 and entering the liquid outlet section 400.

[0032] Further, as shown in FIG. 2 , a plurality of convex ribs 410 are provided on the inner wall of one end of the liquid outlet section 400 close to the swirl plate 500. The convex ribs 410 protrude inwardly along the radial direction of the liquid outlet section 400, and the convex ribs 410 extend in a long strip shape along the axial direction of the liquid outlet section 400. The convex ribs 410 are sequentially spaced and distributed along the circumference of the liquid outlet section 400. At least a portion of the convex ribs 410 are located on the spiral extension path of the swirl plate 500. That is, one end of the swirl plate 500 close to the liquid outlet section 400 is the downstream end of the swirl plate 500, a portion of the convex ribs 410 are located on the downstream side of the swirl plate 500, and at least a portion of the convex ribs 410 are located on the virtual spiral line extending spirally from the downstream end of the swirl plate 500 toward the liquid outlet section 400. When the fluid flows spirally along the swirl plate 500 to the transition position between the foaming chamber 300 and the liquid outlet section 400, the fluid impact collides on the convex ribs 410, further improving the foaming rate. A portion of the fluid will also flow out of the swirl plate 500 and touch the inner wall of the tube body where the convex ribs 410 are located, and then collide with each convex rib 410 .

[0033] In some embodiments of the present invention, as shown in FIG. 1 and FIG. 2 , the venturi channel 200 includes a mixing zone 220, a flow plate 230, the negative pressure zone 210 and a rectifying zone 240 arranged in sequence along the axial direction. The mixing zone 220 is connected to the incident zone 101. The flow plate 230 is provided with a plurality of flow holes 231, and the aperture of the flow holes 231 is smaller than the minimum inner diameter of the mixing zone 220. The aperture of the flow holes 231 is smaller than the minimum inner diameter of the negative pressure zone 210. Water and foaming agent enter the mixing zone 220 for preliminary mixing, and then form a high-speed fluid through the flow holes 231 to enter the negative pressure zone 210, and the fluid forms a negative pressure in the negative pressure zone 210 to inhale the external air. The rectifying zone 240 is connected to the foaming chamber 300, and the end of the rectifying zone 240 close to the foaming chamber 300 is the water outlet end 201 of the venturi channel 200. The inner diameter of the rectifying area 240 is smaller than the inner diameter of the negative pressure area 210, and the transition position between the rectifying area 240 and the negative pressure area 210 is in a constricted shape that gradually shrinks toward the rectifying area 240. After the fluid enters the rectifying area 240 from the negative pressure area 210, it is initially rectified and then ejected into the foaming cavity 300 for foaming. Alternatively, the second hole shoulder 602 is formed at the transition position between the rectifying area 240 and the foaming cavity 300.

[0034] In the description of this specification, the description of reference terms such as "some specific embodiments" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0035] Although the embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the claims and their equivalents.

Claims

1. A foam shield nozzle, characterized in that: The invention comprises a liquid inlet section (100), a foaming chamber (300) and a liquid outlet section (400) which are connected in sequence, wherein a swirl sheet (500) is installed in the foaming chamber (300), the swirl sheet (500) extending in a spiral shape, and a plurality of through holes (510) are provided on the swirl sheet (500), so that at least a part of the fluid sprayed from the liquid inlet section (100) into the foaming chamber (300) can impact on the swirl sheet (500).

2. The foam shield nozzle according to claim 1, characterized in that: The axial direction of each through hole (510) is parallel to the axis of the swirl plate (500).

3. The foam shield nozzle according to claim 1, characterized in that: The swirl sheet (500) spirally extends around a columnar space (520); one end of the liquid inlet section (100) connected to the foaming chamber (300) is a water outlet end (201); the maximum inner diameter of the foaming chamber (300) is greater than the inner diameter of the water outlet end (201); the columnar space (520) is located within the axial projection range of the water outlet end (201); the diameter of the columnar space (520) is smaller than the inner diameter of the water outlet end (201); and the axial projection of the edge of the water outlet end (201) is aligned with the surface of the swirl sheet (500).

4. The foam shield nozzle according to claim 1 or 3, characterized in that: The outer edge of the swirl sheet (500) abuts against the inner wall of the foaming cavity (300), or there is a gap of no more than 2 mm between the outer edge of the swirl sheet (500) and the inner wall of the foaming cavity (300).

5. The foam shield nozzle according to claim 3, characterized in that: A first hole shoulder (601) is formed at a transition position between the liquid outlet section (400) and the foaming cavity (300), a second hole shoulder (602) is formed at a transition position between the water outlet end (201) and the foaming cavity (300), and the swirl sheet (500) is clamped between the first hole shoulder (601) and the second hole shoulder (602) along the axial direction.

6. The foam shield nozzle according to claim 3, characterized in that: The inner diameter of the water outlet end (201) is greater than the minimum inner diameter of the liquid outlet section (400), and the diameter of the columnar space (520) is smaller than the minimum inner diameter of the liquid outlet section (400).

7. The foam shield nozzle according to claim 1, characterized in that: A plurality of convex ribs (410) are provided on the inner wall of one end of the liquid outlet section (400) close to the swirl plate (500), the convex ribs (410) being distributed in sequence and at intervals along the circumference of the liquid outlet section (400), and at least a portion of the convex ribs (410) being located on the spiral extension path of the swirl plate (500).

8. The foam shield nozzle according to claim 1 or 3, characterized in that: The liquid inlet section (100) comprises an incident area (101) and a venturi channel (200); the venturi channel (200) is located between the incident area (101) and the foaming chamber (300); a negative pressure area (210) of the venturi channel (200) is provided with an air suction channel (211); at least a portion of the fluid sprayed from the venturi channel (200) into the foaming chamber (300) can impact on the swirl sheet (500).

9. The foam shield nozzle according to claim 8, characterized in that: The Venturi channel (200) comprises a mixing zone (220), a flow plate (230), the negative pressure zone (210) and a rectifying zone (240) arranged in sequence along the axial direction; the mixing zone (220) is connected to the incident zone (101); the flow plate (230) is provided with a plurality of flow holes (231); the aperture of the flow holes (231) is smaller than the minimum inner diameter of the mixing zone (220); the aperture of the flow holes (231) is smaller than the minimum inner diameter of the negative pressure zone (210); the rectifying zone (240) is connected to the foaming chamber (300); and the end of the rectifying zone (240) close to the foaming chamber (300) is the water outlet end (201) of the Venturi channel (200).

10. The foam shield nozzle according to claim 8, characterized in that: The incident area (101) is provided with a first liquid inlet (110) and a second liquid inlet (120).

11. The foam shield nozzle according to claim 9, characterized in that: The inner diameter of the rectifying area (240) is smaller than the inner diameter of the negative pressure area (210), and the transition position between the rectifying area (240) and the negative pressure area (210) is in a shrinking shape that gradually shrinks in the direction of the rectifying area (240).

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