CN114602867A

CN114602867A - Foam generating device and cleaning machine

Info

Publication number: CN114602867A
Application number: CN202210304164.8A
Authority: CN
Inventors: 田玮; 徐俊翊; 周枫; 缪新宇; 许志伟; 胡彦滨
Original assignee: Nilfisk Advance AS
Current assignee: Nilfisk AS
Priority date: 2022-03-25
Filing date: 2022-03-25
Publication date: 2022-06-10

Abstract

The application provides a foam generating device and cleaning machine, foam generating device includes: the foaming pipe (2), the front end of the foaming pipe (2) is provided with a jet flow shape limiting part, and the jet flow shape limiting part limits a channel through which foam passes; a front end rotating case (6), the front end rotating case (6) being connected to the foam tube (2) so as to be rotatable with respect to the foam tube (2); and the pressure application part (71), the pressure application part (71) can be movably connected to the foaming tube (2) along the axial direction (A) of the foaming tube (2) relative to the jet flow shape limiting part, when the pressure application part (71) moves to one side of the axial direction of the jet flow shape limiting part, the pressure application part (71) can apply force to the jet flow shape limiting part to deform the jet flow shape limiting part, and when the pressure application part (71) moves to the other side of the axial direction of the jet flow shape limiting part, the pressure application part (71) can release or reduce the force to the jet flow shape limiting part to restore the jet flow shape limiting part.

Description

Foam generating device and cleaning machine

Technical Field

The application relates to a foam generating device and a cleaning machine.

Background

The cleaning machine is a device which uses the mixed liquid of water and cleaning agent as cleaning medium and utilizes high-pressure water flow to clean the surface of an object. The cleaning machine comprises a foam generating device, and the foam generating device can mix the mixed liquid of water and the cleaning agent with air to form foam and spray the foam.

Disclosure of Invention

The application aims at providing a foam generating device and a cleaning machine comprising the same, so that the foam generating device can adjust the shape of a sprayed foam jet.

The application provides a foam generating device, includes:

the foaming pipe is provided with a jet flow shape limiting part at the front end, and the jet flow shape limiting part limits a channel through which foam passes;

a front end rotating case rotatably connected to the foaming tube with respect to the foaming tube; and

a pressing portion connected to the foaming tube so as to be movable in an axial direction of the foaming tube with respect to the jet flow shape defining portion,

when the pressure part moves towards one side of the axial direction of the jet flow shape limiting part, the pressure part can apply force to the jet flow shape limiting part to deform the jet flow shape limiting part,

when the pressure part moves towards the other side of the jet flow shape limiting part in the axial direction, the pressure part can release or reduce the force on the jet flow shape limiting part to restore the jet flow shape limiting part.

In at least one embodiment, the present invention further comprises a sleeve, the pressing portion is provided to the sleeve, the sleeve and the front end rotation case are engaged by a screw, the sleeve is slidably fitted with the foaming tube in the axial direction with respect to the foaming tube, and thereby rotating the front end rotation case can move the pressing portion in the axial direction with respect to the jet flow shape defining portion.

In at least one embodiment, the pressure applying part is fixedly coupled to the front end rotating shell, and the front end rotating shell is screw-coupled to the foaming tube, so that rotating the front end rotating shell can move the pressure applying part in the axial direction with respect to the jet flow shape defining part.

In at least one embodiment, the jet shape defining portion has a force receiving surface in contact with the pressing portion, the force receiving surface being inclined with respect to the axial direction.

In at least one embodiment, the jet shape defining portion is a duck bill including two lips, and a radial distance of the force-receiving surface gradually increases in a direction from a base end to a front end of the duck bill.

In at least one embodiment, the foaming tube has a foaming tube ring groove formed in an outer periphery thereof, the front end rotary shell is inserted with a pin partially received in the foaming tube ring groove, and the pin relatively fixes and rotates the front end rotary shell and the foaming tube in the axial direction.

In at least one embodiment, the foam generating apparatus further comprises a middle rotating shell sleeved on the foam tube, and the middle rotating shell and the foam tube are torsionally connected so that the foam tube can rotate together with the middle rotating shell to change the angle of the jet flow shape defining portion.

In at least one embodiment, the foam generating apparatus further includes a foaming body, and a snap ring, the foaming body is sleeved with the foaming tube, the snap ring is connected to the foaming tube, and the snap ring relatively fixes the foaming tube and the foaming body in the axial direction and enables the foaming tube and the foaming body to rotate relatively.

In at least one embodiment, the snap ring includes a radially extending portion and a connecting portion, the foaming body is provided at an outer circumference thereof with a foaming body ring groove,

the radially extending portion is connected to the connecting portion, which extends in the circumferential direction of the foam tube, passes through the foam tube in the radial direction of the foam tube and is partially accommodated in the foam body ring groove.

The application also provides a cleaning machine, which comprises the foam generating device in any one of the technical schemes.

By adopting the technical scheme, the pressure applying part can move along the axial direction of the foaming pipe, and can accurately apply pressure to the jet flow shape limiting part, so that the shape of the jet flow is accurately adjusted.

Drawings

Fig. 1 shows a schematic structural view of a foam generating device according to an embodiment of the present application.

Fig. 2 shows an axial sectional view along a vertical plane of a foam-generating device according to an embodiment of the application.

Fig. 3 shows an axial cross-sectional view of a part of a foam-generating device according to an embodiment of the application, in a horizontal plane.

Fig. 4 shows a cross-sectional view of a foam generating device according to an embodiment of the present application.

Fig. 5 shows a schematic structural view of a foaming body of a foam generating device according to an embodiment of the present application.

Fig. 6 shows a schematic structural view of a foaming tube of a foam generating device according to an embodiment of the present application.

Fig. 7 shows a schematic structural view of a snap ring of a foam generating apparatus according to an embodiment of the present application.

Fig. 8 shows a schematic structural view of a sleeve of a foam generating device according to an embodiment of the present application.

Fig. 9 shows a partial cross-sectional view of a foam generating device according to another embodiment of the present application.

Description of the reference numerals

1 foaming body 11 cleaning agent channel 12 air inlet channel 121 air inlet plug 13 diluent channel 14 liquid outlet channel 15 mounting tube 151 air hole 16 foaming body ring groove

2 foaming pipe 21 foaming pipe body 211 through hole 22 foaming steel wool 23 spray head 24 duck mouth part 241 lip 242 stress surface 25 convex rib 26 slide groove 27 clamping part 28 foaming pipe ring groove

3 Venturi tube

4 fixed shell

5 middle rotating shell 51 slot

6 pin shaft of pin hole 62 of front rotating shell 61

7 sleeve 71 pressure applying part 72 projection

8-snap ring 81 radially extending portion 82 connecting portion

100 joint

The A axis C circumferential direction R radial direction.

Detailed Description

In order to more clearly illustrate the above objects, features and advantages of the present application, a detailed description of the present application is provided in this section in conjunction with the accompanying drawings. This application is capable of embodiments in addition to those described herein, and is intended to cover such departures from the present disclosure as come within known or customary practice in the art to which this application pertains and which fall within the limits of the appended claims. The protection scope of the present application shall be subject to the claims.

As shown in fig. 1 to 8, the present application proposes a foam generating apparatus including a foaming body 1, a foaming tube 2, a venturi tube 3, a fixed case 4, a middle rotating case 5, a front rotating case 6, and a sleeve 7.

The foaming body 1 and the venturi tube 3 are both attached to the foaming tube 2. The foaming tube 2 sequentially passes through the fixed shell 4, the middle rotating shell 5 and the front rotating shell 6 in the axial direction A. The middle rotating case 5 and the front rotating case 6 can independently rotate with respect to the fixed case 4, respectively, with the fixed case 4 as a reference. By rotating the middle rotating shell 5, the angle of the foaming tube 2 relative to the fixed shell 4 can be adjusted, and the angle of the sprayed foam liquid column (also called jet flow) will change; by rotating the front end rotating shell 6, the shape of the liquid outlet end (also referred to as the jet shape defining portion) of the foaming tube 2 is changed, and the shape of the sprayed foam liquid column is changed.

(foam body)

As shown in fig. 2 to 5, particularly in fig. 5, the foaming body 1 includes a detergent passage 11, an air inlet passage 12, a high-pressure liquid passage 13, and a liquid outlet passage 14, and the detergent passage 11, the air inlet passage 12, the high-pressure liquid passage 13, and the liquid outlet passage 14 may communicate crosswise. With the entire foam generating apparatus (or its length direction, axial direction a) horizontally arranged as a reference, the detergent passage 11 and the air intake passage 12 may extend in the vertical direction (up-down direction in fig. 5), and the high-pressure liquid passage 13 and the liquid outlet passage 14 may extend in the horizontal direction (left-right direction in fig. 5).

The respective passages of the foaming body 1 of the present application are not limited to the above arrangement. For example, the air intake passage 12 may also extend in the horizontal direction with reference to the cleaning agent passage 11 extending vertically, that is, the air intake passage 12 may extend to the side of the foam generating apparatus rather than upward as shown in fig. 5. In this way, an angle of about 90 degrees may be formed between the air intake passage 12 and the cleaning agent passage 11.

The cleaning agent channel 11 is used for passing cleaning agent such as soap liquid, the cleaning agent channel 11 can extend downwards from the intersection position of the plurality of channels, the cleaning agent channel 11 can be communicated with a cleaning agent container through a pipeline, and the cleaning agent container can contain cleaning agent such as soap liquid.

The intake passage 12 may extend upward from the intersection of the plurality of passages, an intake plug 121 (see fig. 2) may be installed in the intake passage 12, for example, by threads, the intake plug 121 may be moved along the intake passage 12 by rotating the intake plug 121, and the opening degree of the intake port at the end of the intake passage 12 may be changed, thereby adjusting the intake air flow rate.

The high pressure fluid passage 13 may be connected with a joint 100, the joint 100 may be used for connecting a water pipe, and the high pressure fluid passage 13 is used for passing a high pressure fluid such as high pressure water, thereby generating a negative pressure to suck the cleaning agent out of the cleaning agent passage 11.

The cleaning agent, the high-pressure liquid and the air can flow out through the liquid outlet channel 14 after the foaming body 1 is mixed (foamed).

The end of the outlet channel 14 is provided with a mounting tube 15, the mounting tube 15 may be cylindrical, the end of the mounting tube 15 may be sleeved on the radial outer side of the wall defining the outlet channel 14, and the mounting tube 15 is used for mounting and accommodating the venturi tube 3 (see fig. 2 and 3). The mounting tube 15 is provided with an air hole 151, the air hole 151 being located on the upstream side of the venturi tube 3, and air introduced through the air hole 151 can be used to mix with liquid to generate bubbles.

The mounting tube 15 is provided with a foam body ring groove 16 on the outer periphery thereof, and the foam body ring groove 16 accommodates a radially extending portion 81 (see fig. 7 and 3) of a snap ring 8 described later so that the foam tube 2 is rotatably mounted to the foam body 1 via the snap ring 8 and the foam tube 2 and the foam body 1 are restricted from being relatively fixed in the axial direction a.

(foaming tube)

As shown in fig. 2 to 4 and 6, and particularly in fig. 6, foam tube 2 includes foam tube main body 21, foam steel wool 22, and spray head 23. The foam tube main body 21 is cylindrical, and the front end of the foam tube main body 21 has an opening through which foam is discharged. The foaming steel wool 22 and the spray head 23 are both arranged inside the foaming pipe main body 21, the spray head 23 is positioned at the front end of the foaming steel wool 22, and liquid and gas can be mixed by the foaming steel wool 22 to be foamed into foam, and then are sprayed out through the spray head 23.

The foaming tube main body 21 is fitted to the outer side in the radial direction of the mounting tube 15, and the foaming tube main body 21 is connected to the foaming body 1 so as to be rotatable with respect to the foaming body 1.

Referring to fig. 3 and 7, the snap ring 8 includes a radially extending portion 81 and a connecting portion 82, the radially extending portion 81 is connected to the connecting portion 82, the connecting portion 82 may have an arc shape extending in the circumferential direction C of the foam tube 2, and the connecting portion 82 may have a central angle greater than or equal to 180 degrees, so that the snap ring 8 is easily connected to the foam body 1, for example, the connecting portion 82 may have a semi-arc shape having a central angle of 180 degrees. The radial extension portions 81 may be provided in two, and the two radial extension portions 81 may be connected to both ends of the connecting portion 82 and extend in the radial direction R of the foam tube main body 21.

As shown in fig. 2 to 4 and 6, the side wall of the foam tube main body 21 is provided with a through hole 211 for passing the radially extending portion 81 of the snap ring 8 therethrough, and the snap ring 8 is connected to the foam tube 2 by passing the radially extending portion 81 through the through hole 211. The radially extending portion 81 can pass through the through hole 211 and be fitted into the foam body ring groove 16 (see fig. 5), thereby restricting the movement of the foam tube main body 21 in the axial direction a with respect to the foam body 1 and enabling the foam tube main body 21 to rotate about the axis of the foam tube 2 with respect to the foam body 1.

The front end of the foam tube main body 21 forms a duck-bill portion 24, the duck-bill portion 24 includes two lips 241, and foam can be ejected from between the two lips 241. The lip 241 may have elasticity or the lip 241 may be elastically connected to the foam tube main body 21, and the two lips 241 may be elastically deformed to change a distance between the two lips 241. It is understood that the lip 241 may have elasticity itself or may be connected to an elastic portion having elasticity. The lip 241 has a force receiving surface 242 that contacts a pressing portion 71 (see fig. 8) described later, and the force receiving surface 242 is inclined with respect to the axial direction a. The force-bearing surfaces 242 diverge the duck-bill 24 in a direction from the base end to the tip end of the duck-bill 24, and more specifically, the distance between the two force-bearing surfaces 242 gradually increases.

The periphery of the foam tube main body 21 is provided with a convex rib 25, the rib 25 can extend in the axial direction a of the foam tube main body 21, and the rib 25 is used for being engaged with the middle rotating shell 5, so that the foam tube main body 21 and the middle rotating shell 5 can rotate together.

The foam tube main body 21 is provided at its outer periphery with a slide groove 26, the slide groove 26 being extendable in the axial direction a of the foam tube main body 21, the slide groove 26 being adapted to engage with the sleeve 7 so that the sleeve 7 is slidable along the slide groove 26 (in the axial direction a).

The foam tube main body 21 may be provided with a catching portion 27, and the catching portion 27 is used to connect the middle rotating case 5 to the foam tube main body 21. It will be appreciated that the snap-in portion 27 may be resilient and not suitable for withstanding large forces, the snap-in portion 27 primarily secures the central rotating shell 5 and the foam tube body 21 to each other in the axial direction a; and the torsion-resistant connection of the middle rotating shell 5 and the foaming tube main body 21 is mainly realized through the convex rib 25, and the convex rib 25 is matched with the middle rotating shell 5 to ensure that the foaming tube main body 21 and the middle rotating shell 5 can rotate together, so that the foam generating device is more reliable or durable.

It should be understood that the snap-in portion 27 may also be omitted in case the central swivel shell 5 can be axially fixed in other ways; in this case, the card slot 51 described later is also omitted.

The foam tube main body 21 is provided at its outer periphery with a foam tube ring groove 28, the foam tube ring groove 28 is adapted to be fitted with a pin 62, and the pin 62 is partially received in the foam tube ring groove 28, so that the front end rotary case 6 can rotate relative to the foam tube main body 21 and cannot move in the axial direction a relative to the foam tube main body 21.

(Venturi tube)

As shown in fig. 2, the venturi tube 3 is disposed inside the mounting pipe 15 such that the venturi tube 3 is located at the front end (right side in fig. 2) of the liquid outlet passage 14. There is a gap between the rear end of the venturi tube 3 and the end of the outlet channel 14 so that air from the air holes 151 can enter the venturi tube 3 through the gap.

(stationary case)

As shown in fig. 2, the fixing case 4 may be fitted over the outside of the foaming body 1.

(middle rotating case)

As shown in fig. 1 to 4, the middle rotating shell 5 is sleeved on the radial outer side of the foaming tube 2, the middle rotating shell 5 is provided with a clamping groove 51, and the clamping portion 27 of the foaming tube 2 can be embedded into the clamping groove 51, so that the middle rotating shell 5 is connected to the foaming tube 2.

The internal week of middle part rotation shell 5 is provided with protruding muscle 25 complex recess, and protruding muscle 25 embedding recess can make the middle part rotate casing 5 and drive foaming pipe 2 and rotate together, makes duckbilled portion 24 change angle, and then changes the angle of the efflux that jets out through duckbill portion 24. For example, the passage defined by duckbill 24 shown in figure 2 extends in a horizontal direction, and rotating central rotating housing 5 by 90 degrees changes the passage defined by duckbill 24 to extend in a vertical direction; the duckbill 24 as shown emits a fan-shaped jet, so that the change in angle of the jet causes the fan-shaped jet to be emitted in the proper attitude.

(front end rotating case)

As shown in fig. 1 to 3, the front end rotary shell 6 is fitted around the outer side of the foaming tube 2 in the radial direction, and the front end rotary shell 6 is located in front of the middle rotary shell 5. The front end rotary case 6 is provided with a pin hole 61, and the pin hole 61 is used for mounting a pin 62. As previously described, pin 62 is partially received in foam tube groove 28 so that front end rotating shell 6 can rotate relative to foam tube body 21 and cannot move in axial direction a relative to foam tube body 21.

(Sleeve)

As shown in fig. 2, 3 and 8, the sleeve 7 is sleeved on the radial outer side of the duckbill part 24, and the sleeve 7 has a pressing part 71, and the pressing part 71 can contact the force bearing surface 242 of the duckbill part 24 so as to press the duckbill part 24. The sleeve 7 is slidably connected to the foam tube 2 in the axial direction a of the foam tube 2. Specifically, the inner periphery of the sleeve 7 is provided with, for example, a convex portion 72 in the form of a convex strip, and the convex portion 72 is engaged with the slide groove 26 of the foam tube 2 so that the sleeve 7 can slide along the slide groove 26 without being rotatable relative to the foam tube 2.

When the sleeve 7 moves forwards along the axial direction A (for example, the right side in the figure 2), the duck-bill part 24 is pressed to generate elastic deformation and close gradually; when the sleeve 7 moves backward (for example, to the left in fig. 2) in the axial direction a, the sleeve 7 releases or reduces the pressure on the duck-bill portion 24 to restore the duck-bill portion 24 to the open state. The cross-section of the passage defined by the duck-bill 24 is changed by the deformation of the two lips 241, so that the shape of the jet emitted through the duck-bill 24 is changed.

The front end rotates shell 6 and sleeve 7 can screw-thread fit, rotates the front end and rotates shell 6 and can control sleeve 7 and remove along axial A, and then adjusts the opening degree of duckbilled portion, because the front end rotates 6 rotatory a week of shell, the distance that sleeve 7 removed along axial A only is the helical pitch of screw thread, and the opening degree of duckbilled portion 24 can be adjusted more accurately to the fluidic shape of accurate regulation.

In addition, since the sleeve 7 is enclosed inside the front end rotary shell 6, the front end rotary shell 6 is defined by the pin 62 and the foaming tube ring groove 28 in the position in the axial direction a, in the process that the sleeve 7 is driven to move in the axial direction a relative to the duckbill portion 24, the front end rotary shell 6 does not displace in the axial direction a relative to the middle rotary shell 5 and the fixed shell 4, and the front end rotary shell 6 and the middle rotary shell 5 are kept close to each other, so that the foam generating device has good sealing performance and high reliability as a whole.

In another embodiment, as shown in fig. 9, the outer periphery of foam tube 2 is threaded, foam tube 2 is threadedly engaged with tip turn shell 6, and tip turn shell 6 can be moved relative to foam tube 2 in axial direction a while rotating tip turn shell 6. Since the front end rotary shell 6 also moves relative to the foam tube 2 in the axial direction a during rotation, the foam generating device in another embodiment does not include the pin hole and pin shaft of the previous embodiment, and the foam tube does not need to be provided with a foam tube ring groove. The pressing portion 71 is fixedly connected to the inner wall of the front end rotation case 6, and the pressing portion 71 may be formed integrally with the front end rotation case 6. The pressing part 71 is located at the radial outer side of the duck-bill part 24, the force bearing surface of the duck-bill part 24 can be a conical surface, and the surface of the pressing part 71 facing the force bearing surface can be a circular arc surface, so that the pressing part 71 can rotate relative to the duck-bill part 24. During movement of the pressing portion 71 in the axial direction a, the duckbill portion 24 may be pressed to deform the duckbill portion 24. In the forward moving process of the front end rotating shell 6, the pressing part 71 gradually presses the duck bill part 24 to gradually close the duck bill part 24, and in the backward moving process of the front end rotating shell 6, the pressing part 71 can gradually release or reduce the pressing of the duck bill part 24 to open the duck bill part 24.

The present application is described in detail using the above embodiments, but the following points are also described here.

(1) In the above embodiment, the snap ring 8 has two radial extensions 81, however, the present application is not limited thereto, and in other possible embodiments, the radial extensions may be provided more, for example, 3.

(2) In the above embodiment, the duckbill 24 includes two lips 241, however, the present application is not limited thereto. The duck bill is merely an example of the jet shape defining portion of the present application. For example, the jet shape defining portion may include more lips. For example, in one example, the jet shape defining portion may include three or four lips so that a jet of, for example, a Y-shape or a cross-shape may be ejected. In this case, the force receiving surface 242 may be a part of a conical surface, and the inner circumferential surface of the pressing portion may be, for example, circular.

(3) In the above embodiment, the force-receiving surface 242 gradually expands the duckbill portion 24 in the direction from the base end to the tip end of the duckbill portion 24, but the present application is not limited thereto, and the force-receiving surface may gradually expand the duckbill portion in the direction from the base end to the tip end of the duckbill portion (i.e., the distance between the two force-receiving surfaces gradually decreases).

While the present application has been described in detail with reference to the above embodiments, it will be apparent to those skilled in the art that the present application is not limited to the embodiments described in the present specification. The present application can be modified and implemented as a modified embodiment without departing from the spirit and scope of the present application defined by the claims. Therefore, the description in this specification is for illustrative purposes and does not have any limiting meaning for the present application.

Claims

1. A foam generating device, comprising:

a foaming tube (2), the front end of the foaming tube (2) being provided with a jet shape defining portion defining a passage through which foam passes;

a front end rotating case (6), the front end rotating case (6) being rotatably connected to the foaming tube (2) with respect to the foaming tube (2); and

a pressure application portion (71), the pressure application portion (71) being connected to the foaming tube (2) so as to be movable in an axial direction (A) of the foaming tube (2) relative to the jet flow shape defining portion,

when the pressure part (71) moves to one side of the jet flow shape limiting part in the axial direction, the pressure part (71) can apply force to the jet flow shape limiting part to deform the jet flow shape limiting part,

when the pressure part (71) moves to the other side of the jet flow shape limiting part in the axial direction, the pressure part (71) can release or reduce the force on the jet flow shape limiting part to restore the jet flow shape limiting part.

2. Foam-generating device according to claim 1, characterized in that it further comprises a sleeve (7), said pressure-exerting portion (71) being provided to said sleeve (7), said sleeve (7) and said front-end rotation housing (6) being screw-fitted, said sleeve (7) being fitted with said foaming tube (2) slidably in said axial direction (a) with respect to said foaming tube (2), so that rotating said front-end rotation housing (6) moves said pressure-exerting portion (71) in said axial direction (a) with respect to said jet-shape defining portion.

3. Foam-generating device according to claim 1, characterized in that the pressure portion (71) is fixedly connected to the front end rotation housing (6), the front end rotation housing (6) and the foaming tube (2) being screw-engaged, whereby rotating the front end rotation housing (6) enables the pressure portion (71) to move in the axial direction (a) relative to the jet shape defining portion.

4. Foam-generating device according to claim 1, characterized in that the jet-shape defining part has a force-bearing surface in contact with the pressure-exerting part (71), which force-bearing surface is inclined with respect to the axial direction (a).

5. The foam generating device as claimed in claim 4, wherein the jet-shaped defining portion is a duckbill portion (24) including two lips (241), and a radial distance of the force-receiving surface (242) is gradually increased in a direction from a base end to a front end of the duckbill portion (24).

6. Foam-generating device according to claim 1, characterized in that the foaming tube (2) is provided with a foaming tube ring groove (28) on its periphery, the front end rotating shell (6) is inserted with a pin (62), the pin (62) is partially accommodated in the foaming tube ring groove (28), and the pin (62) makes the front end rotating shell (6) and the foaming tube (2) relatively fixed and relatively rotatable in the axial direction (a).

7. Foam-generating device according to claim 1, characterized in that it further comprises a central rotating shell (5), said central rotating shell (5) being sleeved on said foaming tube (2), said central rotating shell (5) being connected with said foaming tube (2) in a torsionally rigid manner, so that said foaming tube (2) can rotate together with said central rotating shell (5) and the angle of said jet-shaped defining portion is changed.

8. The foam generating device as recited in any one of claims 1 to 7, characterized in that the foam generating device further comprises a foaming body (1) and a snap ring (8), the foaming tube (2) is sleeved on the foaming body (1), the snap ring (8) is connected to the foaming tube (2), and the snap ring (8) enables the foaming tube (2) and the foaming body (1) to be relatively fixed and relatively rotatable in the axial direction (A).

9. Foam-generating device according to claim 8, characterized in that the snap ring (8) comprises a radial extension (81) and a connecting portion (82), the foaming body (1) being provided with a foaming body ring groove (16) at its outer circumference,

the radially extending portion (81) is connected to the connecting portion (82), the connecting portion (82) extends in the circumferential direction (C) of the foam tube (2), and the radially extending portion (81) passes through the foam tube (2) extending in the radial direction (R) of the foam tube (2) and is partially accommodated in the foam body groove (16).

10. A cleaning machine comprising a foam generating device as claimed in any one of claims 1 to 9.