Impeller and foam pump

Abstract

The invention relates to the technical field of foam pumps, and discloses an impeller and a foam pump, the impeller comprises a front ceramic piece, a rear ceramic piece and a metal framework, the front ceramic piece comprises a front cover plate, blades and guide blades which are connected in sequence; the rear ceramic piece comprises a rear cover plate, the rear cover plate is arranged on the side, away from the blades, of the front cover plate and spliced with the front cover plate, and a fixing cavity is formed between the rear cover plate and the front cover plate. The metal framework comprises a first supporting piece, a second supporting piece and a third supporting piece which are connected, the first supporting piece is arranged in the fixing cavity, the second supporting piece is embedded in the blade, and the third supporting piece is embedded in the guide blade. According to the invention, the front ceramic piece and the rear ceramic piece are respectively and integrally formed, and when the front ceramic piece and the rear ceramic piece need to be connected, the front cover plate and the rear cover plate are spliced; after the front ceramic piece and the rear ceramic piece are integrally formed respectively, the metal framework is embedded into the blades and the guide vanes, and then the front cover plate and the rear cover plate are spliced.

Description

Technical Field

[0001] The invention relates to the technical field of foam pumps, and in particular to an impeller and a foam pump. Background Art

[0002] In the mining process, foam pumps are mainly used in flotation process. Through their special design, they can effectively transport ore slurry containing foam and eliminate the foam in the slurry to ensure the smooth progress of the process.

[0003] A foam pump generally includes a pump body and an impeller built into the pump body. The foam-containing slurry is transported by the rotating impeller and the foam in the slurry is eliminated. In the existing foam pump, in order to guide the foam in the slurry into the pump body, a guide vane is provided on the impeller, and the guide vane extends into the inlet of the pump body.

[0004] In a foam pump provided with guide vanes, since the guide vanes extend from the impeller toward the inlet of the pump body, the guide vanes deviate from the impeller, and may break when colliding with particles in the slurry. Summary of the invention

[0005] The purpose of the present invention is to overcome the above technical deficiencies and to provide an impeller and a foam pump to solve the technical problem that the guide vanes in the prior art may break.

[0006] In order to achieve the above technical objectives, the present invention adopts the following technical solutions: In a first aspect, the present invention provides an impeller, comprising: A front ceramic part, including a front cover plate, blades and guide vanes connected in sequence; A rear ceramic component, comprising a rear cover plate, the rear cover plate being arranged on a side of the front cover plate away from the blades and being spliced ​​with the front cover plate, with a fixing cavity being formed between the rear cover plate and the front cover plate; and The metal frame comprises a first support member, a second support member and a third support member which are connected to each other. The first support member is arranged in the fixing cavity, the second support member is embedded in the blade, and the third support member is embedded in the guide vane.

[0007] In one embodiment, the impeller further includes a first adhesive layer, which is built into the fixing cavity and connects the front cover plate and the rear cover plate.

[0008] In one embodiment, the first adhesive layer is disposed in the gap between the second support member and the blade.

[0009] In one embodiment, the first support member and the second support member are integrally formed, and the third support member and the second support member are separately formed.

[0010] In one embodiment, one section of the third support member is built into the guide vane, and another section extends into the blade and is connected to the second support member, and the size of the portion of the third support member extending from the guide vane to the blade gradually decreases.

[0011] In one embodiment, the second support member is provided with a mounting hole, the mounting hole is communicated with the fixing cavity, and the mounting hole passes through a side of the second support member away from the rear cover plate; The third support member is a soft frame, which is inserted into the mounting hole and passes through the second support member through the mounting hole.

[0012] In one embodiment, the mounting hole passes through the first support member, and the soft skeleton extends into the fixing cavity through the mounting hole.

[0013] In a second aspect, the present invention further provides a foam pump, comprising a pump housing and the impeller as described above, wherein the pump housing is provided with an inlet, the impeller is built into the pump housing, and the guide vane extends into the inlet.

[0014] In one embodiment, the pump casing includes a first metal shell, a second metal shell, a third metal shell, a front guard plate, a volute and a rear guard plate. The first metal shell, the second metal shell and the third metal shell are connected in sequence. The first metal shell and the third metal shell are arranged at both ends of the second metal shell. The front guard plate is connected to the first metal shell, the volute is connected to the second metal shell, and the rear guard plate is connected to the third metal shell. The front guard plate and the rear guard plate are respectively arranged at both ends of the volute and enclose a accommodating cavity. The front guard plate forms the inlet connected to the accommodating cavity, and the rear guard plate forms a fixing hole connected to the accommodating cavity.

[0015] In one embodiment, the front guard plate and the first metal shell, the volute and the second metal shell, and the rear guard plate and the third metal shell are bonded by a third adhesive layer.

[0016] Compared with the prior art, the impeller and foam pump provided by the present invention are provided with guide vanes, which can extend into the inlet of the pump body, guide the foam in the slurry into the pump body, and preliminarily break the foam in the slurry; by setting the material of the front cover plate, blades, guide vanes and rear cover plate to ceramic, the ceramic has high structural strength and wear resistance, and can withstand the wear and corrosion of high-speed flowing slurry; ceramic has high hardness but is brittle, for this reason, in the present invention, a metal skeleton is provided, the metal skeleton has good impact resistance and strength, can enhance the impact resistance of the front cover plate, blades, guide vanes and rear cover plate, and avoid the guide vanes and blades from breaking; at the same time, the metal skeleton is connected with the front cover plate, blades, guide vanes and rear cover plate, which can more effectively disperse and transmit the load, so that when the entire impeller is subjected to external force, the load can be more evenly distributed, reducing local stress concentration.

[0017] In the present invention, the front ceramic part and the rear ceramic part are respectively integrally formed. When it is necessary to realize the connection between the front ceramic part and the rear ceramic part, the front cover plate and the rear cover plate can be spliced. At the same time, since the front cover plate and the rear cover plate are spliced, after the front ceramic part and the rear ceramic part are respectively integrally formed, the metal skeleton can be embedded in the blades and guide vanes, and then the front cover plate and the rear cover plate can be spliced. After splicing, the metal skeleton can be encapsulated in the impeller, which reduces the processing difficulty of the impeller and facilitates production. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 is a structural schematic diagram of a foam pump provided by an embodiment of the present invention; Figure 2 It is a schematic structural diagram of a pump housing in a foam pump provided by an embodiment of the present invention; Figure 3 is a schematic structural diagram of an impeller provided by an embodiment of the present invention; Figure 4 is a schematic structural diagram of an impeller provided by an embodiment of the present invention; Figure 5 yes Figure 4 A local enlarged schematic diagram of point A in the middle.

[0019] Description of reference numerals: Front ceramic part 1; front cover plate 11; blade 12; guide vane 13; cavity 14; rear ceramic part 2; rear cover plate 21; back rib 22; metal frame 3; first support member 31; second support member 32; third support member 33; mounting hole 34; first adhesive layer 4; pump casing part 5; first metal shell 51; second metal shell 52; third metal shell 53; front guard plate 54; volute 55; rear guard plate 56; second adhesive layer 57; fixed cavity a. DETAILED DESCRIPTION

[0020] In order to make the purpose, technical solution and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0021] In order to solve the technical problem that guide blades may break in the prior art, the present invention provides an impeller and a foam pump, which can prevent the guide blades from breaking.

[0022] It should be noted that the impeller in the present invention is used for but not limited to foam pumps, etc. For the convenience of explanation, in the present invention, only the application of the impeller to the foam pump is used as an example for explanation, and the principle of applying the impeller to other types of equipment is essentially the same as the principle applied to the foam pump, which will not be repeated here.

[0023] See also Figure 3 , Figure 3 Schematic diagram of the structure of an impeller in an embodiment of the present invention, an impeller includes a front ceramic part 1, a rear ceramic part 2 and a metal frame 3, the front ceramic part 1 includes a front cover plate 11, blades 12 and guide vanes 13 connected in sequence; the rear ceramic part 2 includes a rear cover plate 21, the rear cover plate 21 is arranged on the side of the front cover plate 11 away from the blades 12, and is spliced ​​with the front cover plate 11, and a fixed cavity a is formed between the rear cover plate 21 and the front cover plate 11; the metal frame 3 includes a first support member 31, a second support member 32 and a third support member 33 connected to each other, the first support member 31 is arranged in the fixed cavity a, the second support member 32 is embedded in the blade 12, and the third support member 33 is embedded in the guide vane 13.

[0024] Specifically, by setting the guide vane 13, the guide vane 13 can extend into the inlet of the pump body, can guide the foam in the slurry into the pump body, and preliminarily break the foam in the slurry; by setting the material of the front cover plate 11, the blades 12, the guide vanes 13 and the rear cover plate 21 to ceramic, the ceramic has high structural strength and wear resistance, and can withstand the wear and corrosion of the high-speed flowing slurry; the ceramic has high hardness but the material is relatively brittle, for this reason, in the present invention, a metal skeleton 3 is set, the metal skeleton 3 has good impact resistance and strength, can enhance the impact resistance of the front cover plate 11, the blades 12, the guide vanes 13 and the rear cover plate 21, and avoid the guide vanes 13 and the blades 12 from breaking; at the same time, the metal skeleton 3 is connected to the front cover plate 11, the blades 12, the guide vanes 13 and the rear cover plate 21, which can more effectively disperse and transfer the load, so that when the entire impeller is subjected to external force, the load can be more evenly distributed, reducing local stress concentration.

[0025] In the present invention, the front ceramic part 1 and the rear ceramic part 2 are respectively integrally formed. When it is necessary to realize the connection between the front ceramic part 1 and the rear ceramic part 2, the front cover plate 11 and the rear cover plate 21 can be spliced. At the same time, since the front cover plate 11 and the rear cover plate 21 are spliced, after the front ceramic part 1 and the rear ceramic part 2 are respectively integrally formed, the metal skeleton 3 can be embedded in the blades 12 and the guide vanes 13, and then the front cover plate 11 and the rear cover plate 21 can be spliced. After splicing, the metal skeleton 3 can be encapsulated in the impeller, which reduces the processing difficulty of the impeller and facilitates production.

[0026] It should be understood that the connection between the front cover plate 11 and the rear cover plate 21 can be achieved by bolt connection, screw connection, snap connection, bonding, etc. Figure 3 and Figure 5 As shown, in one of the embodiments, the impeller further includes a first adhesive layer 4 , which is built into the fixing cavity a and connects the front cover plate 11 and the rear cover plate 21 .

[0027] By setting the first adhesive layer 4, the first adhesive layer 4 is built into the fixed cavity a, so that the connection between the front cover plate 11 and the rear cover plate 21 can be achieved. At the same time, the first adhesive layer 4 can also fill the gap between the front cover plate 11 and the rear cover plate 21 to achieve a stable connection between the metal frame 3 and the front cover plate 11 and the rear cover plate 21.

[0028] The first adhesive layer 4 is formed by injecting adhesive into the fixing cavity a and then curing it.

[0029] In order to embed the second support member 32 into the blade 12, there may be a gap between the second support member 32 and the blade 12. The existence of the gap will affect the connection strength between the second support member 32 and the blade 12, and affect the strength of the blade 12. For this reason, a first adhesive layer 4 is provided in the gap between the second support member 32 and the blade 12.

[0030] Through the above arrangement, the first adhesive layer 4 can also fill the gap between the second support member 32 and the blade 12 to prevent the existence of the gap from affecting the support of the second support member 32 to the blade 12. At the same time, the first adhesive layer 4 can flow into the gap between the second support member 32 and the blade 12 through the fixed cavity a to facilitate the entry of the adhesive.

[0031] It should be understood that the third support member 33 can be a hard metal or a metal with a certain flexibility.

[0032] It should be understood that the first support member 31, the second support member 32 and the third support member 33 can be integrally formed or separately formed. Specifically, in one embodiment, the first support member 31 and the second support member 32 are integrally formed, and the third support member 33 and the second support member 32 are separately formed.

[0033] Since the guide vane has a three-dimensional curved structure, the third support member 33 needs to adapt to the shape of the guide vane. If the first support member 31, the second support member 32 and the third support member 33 are integrally formed, it is necessary to integrally form the third support member 33 with a complex structure, which is difficult. For this reason, in this embodiment, the first support member 31 and the second support member 32 are integrally formed, and there is sufficient structural strength between the integrally formed first support member 31 and the second support member 32, while the third support member 33 and the first support member 31 are separately formed, which can reduce the difficulty of processing the metal skeleton 3. The third support member 33 after separate forming can be connected to the second support member 32 and the first support member 31 by bonding and welding.

[0034] Since the size of the guide vane is smaller than that of the blade 12, and the third support member 33 is embedded in the guide vane, the size of the third support member 33 is limited, and the size of the connection between the third support member 33 and the second support member 32 is limited, which affects the structural strength. For this reason, in one of the embodiments, one section of the third support member 33 is built into the guide vane, and the other section extends into the blade 12 and is connected to the second support member 32, and the size of the portion of the third support member 33 extending from the guide vane to the blade 12 gradually increases.

[0035] In this embodiment, by extending the third support member 33 into the blade 12, there is sufficient space in the blade 12 so that the size of the third support member 33 can be set larger, which can increase the connection size when the third support member 33 is connected to the second support member 32, and enhance the structural strength between the second support member 32 and the third support member 33.

[0036] In one embodiment, the third support member 33 is a hard metal. At this time, the blade 12 and the guide vane 13 form a cavity 14 connected to the fixed cavity a. The blade 12 and the guide vane 13 are first formed, and then the molten metal is injected into the cavity 14. After the molten metal solidifies, a hard second support member 32 and a third support member 33 are formed, and then the hard second support member 32 is connected to the first support member 31 to form a metal skeleton 3.

[0037] In this embodiment, the third support member 33 is made of hard metal, and the second support member 32 and the third support member 33 formed after the molten metal solidifies are solidified together with the blades 12 and the guide vanes 13, so that the hard second support member 32 and the third support member 33 can enhance the impact resistance and structural strength of the blades 12 and the guide vanes 13.

[0038] Since the guide vane 13 is an arc-shaped and twisted blade 12 structure, in order to form a cavity 14 in the blade 12 and the guide vane 13, it is necessary to use a lost mold or the like, and set the lost mold in the blade 12 and the guide vane 13 before molding. During the molding process of the blade 12 and the guide vane 13, the lost mold disappears to form the cavity 14. However, the thickness of the guide vane 13 is relatively thin, and the size of the cavity 14 that can be formed is relatively small. It is not easy for the molten metal to enter the small-sized cavity 14, and it is impossible to ensure that the molten metal fills the cavity 14. Therefore, Figure 5 As shown, in one of the embodiments, the second support member 32 is provided with a mounting hole 34, the mounting hole 34 is connected to the fixing cavity a, and the mounting hole 34 passes through the side of the second support member 32 away from the rear cover plate 21; the third support member 33 is a soft skeleton, the soft skeleton is inserted into the mounting hole 34, and passes through the second support member 32 through the mounting hole 34.

[0039] By inserting the third support member 33 into the second support member 32 through the mounting hole 34, the contact area between the third support member 33 and the second support member 32 is increased compared to the case where the end of the third support member 33 is connected to the second support member 32, which is beneficial to strengthening the connection strength between the third support member 33 and the second support member 32. At the same time, the blade 12 and the guide vane 13 form a cavity 14 connected to the fixed cavity a, and the third support member 33 is inserted into the second support member 32 through the mounting hole 34 and embedded in the guide vane 13. Since the third support member 33 adopts a flexible skeleton, the flexible skeleton can adapt to the curved shape of the guide vane 13; at the same time, if the blade 12 and the guide vane 13 are formed first, the third support member 33 made of the flexible skeleton can adapt to the shape of the cavity 14 in the guide vane 13, and bend and twist adaptively, so that the third support member 33 can enter the preset position in the guide vane 13. Compared with the method of injecting molten metal, this embodiment can avoid the problem that the molten metal cannot enter the cavity 14 in the guide vane 13.

[0040] At the same time, in the process of setting the first adhesive layer 4 into the fixed cavity a, the first adhesive layer 4 can fill the gap between the second support member 32, the third support member 33 and the inner wall of the cavity 14, and realize the connection between the blade 12 and the guide vane 13 of the second support member 32 and the third support member 33.

[0041] The third support member 33 may be a steel wire, a steel mesh, a steel sheet, etc. having a certain degree of flexibility.

[0042] In one embodiment, the mounting hole 34 passes through the first support member 31 , and the soft frame extends into the fixing cavity a through the mounting hole 34 .

[0043] Through the above arrangement, the third support member 33 is connected to the first support member 31, the second support member 32 and the first adhesive layer 4 in the fixed cavity a at the same time, and the connection between the third support member 33 and the first support member 31, the second support member 32 and the first adhesive layer 4 is strengthened, so as to strengthen the connection between the guide vane and the blade 12 and the rear cover plate 21 and the front cover plate 11; at the same time, the third support member 33 can pass through the first support member 31 and be installed in place after the first support member 31 is installed, and during the installation process, the first support member 31 and the second support member 32 can play a supporting and guiding role.

[0044] like Figure 3 As shown, in one embodiment, the rear ceramic component 2 further includes a plurality of back rib pieces 22 , which are disposed on a side of the rear cover plate 21 away from the front cover plate 11 and are spaced apart along the circumference of the rear cover plate 21 .

[0045] By providing a plurality of back ribs 22 , the structural strength of the side of the rear cover plate 21 away from the front cover plate 11 can be strengthened.

[0046] like Figure 3 As shown, in one embodiment, the rear cover plate 21 is provided with a bell mouth along the axial direction, the bell mouth passes through the rear cover plate 21, the first support member 31 is embedded in the fixing cavity a and the bell mouth, and a hub structure is formed in the bell mouth.

[0047] When it is necessary to inject adhesive into the fixing cavity a, the adhesive is injected into the fixing cavity a through the bell mouth, and the adhesive is cured to form a first adhesive layer 4.

[0048] like Figure 1 As shown, the present invention further provides a foam pump, comprising a pump housing 5 and an impeller, the pump housing 5 is provided with an inlet, the impeller is built in the pump housing 5, and the guide vane 13 extends into the inlet.

[0049] The guide vane 13 can extend into the inlet of the pump body, can guide the foam in the slurry into the pump body, and preliminarily break the foam in the slurry; like Figure 2 As shown, in one embodiment, the pump casing 5 includes a first metal shell 51, a second metal shell 52, a third metal shell 53, a front guard plate 54, a volute 55 and a rear guard plate 56. The first metal shell 51, the second metal shell 52 and the third metal shell 53 are connected in sequence. The first metal shell 51 and the third metal shell 53 are arranged at both ends of the second metal shell 52. The front guard plate 54 is connected to the first metal shell 51, the volute 55 is connected to the second metal shell 52, and the rear guard plate 56 is connected to the third metal shell 53. The front guard plate 54 and the rear guard plate 56 are respectively arranged at both ends of the volute 55 and enclose a accommodating cavity. The front guard plate 54 is formed with an inlet connected to the accommodating cavity, and the rear guard plate 56 is formed with a fixing hole connected to the accommodating cavity.

[0050] In the present application, the pump casing is formed by combining a metal shell with a front guard plate 54, a volute 55 and a rear guard plate 56. During use, the slurry only contacts the front guard plate 54, the volute 55 and the rear guard plate 56, which can extend the service life of the first metal shell 51, the second metal shell 52 and the third metal shell 53, and avoid the first metal shell 51, the second metal shell 52 and the third metal shell 53 from being worn and failed by the slurry.

[0051] The materials of the front guard plate 54, the volute 55 and the rear guard plate 56 can be ceramic, rubber and wear-resistant metal, etc. Specifically, in one embodiment, the front guard plate 54, the volute 55 and the rear guard plate 56 are made of sintered ceramic.

[0052] The front guard plate 54, the volute 55 and the rear guard plate 56 can be connected to the metal shell by bonding, bolts and screws.

[0053] Specifically, Figure 2 As shown, in one embodiment, the front guard plate 54 and the first metal shell 51 , the volute 55 and the second metal shell 52 , and the rear guard plate 56 and the third metal shell 53 are bonded by a second bonding layer 57 .

[0054] By setting the second adhesive layer 57, the connection between the front guard plate 54 and the first metal shell 51, the connection between the volute 55 and the second metal shell 52, and the connection between the rear guard plate 56 and the third metal shell 53 can be achieved. At the same time, the front guard plate 54, the volute 55 and the rear guard plate 56 are connected to the metal shell via the second adhesive layer 57.

[0055] The second adhesive layer 57 may be a solid adhesive or a fluid adhesive that is solidified.

[0056] It should be understood that the front guard plate 54, the volute 55 and the rear guard plate 56 can be connected by bonding, bolts, etc. Specifically, Figure 2 As shown, in one embodiment, openings are respectively provided at both ends of the volute 55, the openings are truncated cone-shaped, and the inner diameter gradually decreases in the direction close to the inside of the volute 55. The front guard plate 54 and the rear guard plate 56 are partially inserted into the openings to form a receiving cavity between the spliced ​​front guard plate 54, the volute 55 and the rear guard plate 56.

[0057] In this embodiment, the front guard plate 54 and the rear guard plate 56 cooperate with the opening to form a conical sealing structure, which can prevent the slurry from flowing out of the gap between the front guard plate 54, the volute 55 and the rear guard plate 56.

[0058] like Figure 2As shown, in one of the embodiments, the second metal shell 52 is provided with a through hole, which is connected to the interior of the second metal shell 52, the size of the peripheral walls of the front guard plate 54 and the rear guard plate 56 match the inner wall of the through hole, and the peripheral walls of the front guard plate 54 and the rear guard plate 56 fit and abut the second bonding layer 57 between the volute 55 and the second metal shell 52.

[0059] Since there is a truncated cone-shaped matching structure between the openings of the front guard plate 54 and the rear guard plate 56, when the front guard plate 54 and the rear guard plate 56 are inserted into the opening, there will be interference between the peripheral walls of the front guard plate 54 and the rear guard plate 56 and the inner wall of the through hole. For this reason, in the present embodiment, the peripheral walls of the front guard plate 54 and the rear guard plate 56 are fitted and abut the second adhesive layer 57 between the volute 55 and the second metal shell 52. The second adhesive layer 57 has a certain elasticity. When the front guard plate 54 and the rear guard plate 56 are inserted into the opening, the peripheral walls of the front guard plate 54 and the rear guard plate 56 are fitted with the second adhesive layer 57 and can drive the second adhesive layer 57 to deform to avoid interference. At the same time, the elastic abutment between the front guard plate 54 and the rear guard plate 56 and the second adhesive layer 57 can avoid the formation of a gap between the peripheral walls of the front guard plate 54 and the rear guard plate 56 and the second adhesive layer 57, thereby preventing the slurry from flowing out of the gap.

[0060] like Figure 3 As shown, in one embodiment, the side of the back rib sheet 22 facing away from the front cover plate 11 is an inclined surface, and the inclined surface gradually approaches the rear guard plate 56 along the direction close to the axis of the rear cover plate 21. In this embodiment, the back rib sheet 22 gradually approaches the rear guard plate 56 along the direction of the axis close to the rear cover plate 21, so that the gap between the back rib sheet 22 and the rear guard plate 56 gradually decreases along the direction of the axis close to the rear cover plate 21, which can block the slurry from flowing toward the center of the rear guard plate 56 and prevent the slurry from flowing out from the center position of the rear guard plate 56.

[0061] The specific implementation of the present invention described above does not constitute a limitation on the protection scope of the present invention. Any other corresponding changes and modifications made based on the technical concept of the present invention should be included in the protection scope of the claims of the present invention.

Claims

1. An impeller, characterized in that: include: A front ceramic part, including a front cover plate, blades and guide vanes connected in sequence; A rear ceramic component, comprising a rear cover plate, the rear cover plate being arranged on a side of the front cover plate away from the blades and being spliced ​​with the front cover plate, with a fixing cavity being formed between the rear cover plate and the front cover plate; and The metal frame comprises a first support member, a second support member and a third support member which are connected to each other. The first support member is arranged in the fixing cavity, the second support member is embedded in the blade, and the third support member is embedded in the guide vane.

2. The impeller according to claim 1, characterized in that: It also includes a first adhesive layer, which is built in the fixing cavity and connects the front cover plate and the rear cover plate.

3. The impeller according to claim 2, characterized in that: The first adhesive layer is arranged in a gap between the second support member and the blade.

4. The impeller according to claim 2, characterized in that: The first support member and the second support member are integrally formed, and the third support member and the second support member are separately formed.

5. The impeller according to claim 4, characterized in that: One section of the third support member is built into the guide vane, and another section extends into the blade and is connected to the second support member. The size of the portion of the third support member extending from the guide vane to the blade gradually increases.

6. The impeller according to claim 4, characterized in that: The second support member is provided with a mounting hole, the mounting hole is communicated with the fixing cavity, and the mounting hole passes through a side of the second support member away from the rear cover plate; The third support member is a soft frame, which is inserted into the mounting hole and passes through the second support member through the mounting hole.

7. The impeller according to claim 6, characterized in that: The mounting hole passes through the first supporting member, and the soft frame extends into the fixing cavity through the mounting hole.

8. A foam pump, characterized in that: It comprises a pump casing and an impeller as claimed in any one of claims 1 to 7, wherein the pump casing is provided with an inlet, the impeller is built into the pump casing, and the guide vane extends into the inlet.

9. The foam pump according to claim 8, characterized in that: The pump casing comprises a first metal shell, a second metal shell, a third metal shell, a front guard plate, a volute and a rear guard plate. The first metal shell, the second metal shell and the third metal shell are connected in sequence. The first metal shell and the third metal shell are arranged at both ends of the second metal shell. The front guard plate is connected to the first metal shell, the volute is connected to the second metal shell, and the rear guard plate is connected to the third metal shell. The front guard plate and the rear guard plate are respectively arranged at both ends of the volute and enclose a accommodating cavity. The front guard plate forms the inlet communicated with the accommodating cavity, and the rear guard plate forms a fixing hole communicated with the accommodating cavity.

10. The foam pump according to claim 9, characterized in that: The front guard plate and the first metal shell, the volute and the second metal shell, and the rear guard plate and the third metal shell are bonded together by a third bonding layer.

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