Inverted extrusion pump

Abstract

The utility model discloses an inverted extrusion pump which comprises a pump body, an upper extrusion head and an extrusion nozzle, the pump body is provided with an exhaust channel, a liquid discharge channel, a first foaming cavity, a foaming outlet and a liquid feeding channel, and a suction pipe at the lower end of the pump body is only in contact with air and is communicated with the exhaust channel when inverted. The two channels comprise at least one L-shaped cavity channel, and the tail ends of the two channels are opposite and communicated with the first foaming cavity; the lower end of the upper liquid channel is connected with the foaming outlet, and the upper end of the upper liquid channel is connected with the extrusion nozzle. Gas passes through the suction pipe and the exhaust channel, and liquid passes through the liquid discharge channel, is relatively converged after passing through the L-shaped cavity channel, enters the first foaming cavity to be fully mixed and foamed, and then is discharged from the extrusion nozzle through the liquid feeding channel. The pump is free of flow division of gas and liquid, sufficient in hedging and sufficient in foaming time, is adaptive to inverted extrusion, and produces abundant, uniform and fine bubbles.

Description

Technical Field

[0001] This utility model relates to the field of liquid pump technology, and in particular to an inverted extrusion pump. Background Technology

[0002] A foam pump is a type of pump that produces foam. Its working principle is based on the negative pressure formed around the liquid column after the liquid is ejected at high speed. The negative pressure attracts air into the mixing part, causing the air and liquid to mix again and quickly pass through the mesh to form foam.

[0003] For example, Chinese patent application number CNCN2006201099138, entitled "Foam Pump," includes a pump head, a foaming net disposed inside the pump head's outlet tube, a threaded part of the upper end of the pump head fitted with the threaded part, a body fixedly connected to the threaded part at the upper opening end, and a glass bead disposed at the liquid inlet of the body. In this type of structure, because the foaming net is inside the pump head's outlet tube, the liquid and gas mix and foam at this point, resulting in a short and rapid foaming time before the foam is squeezed out. Moreover, the foaming net is confined inside the pump head's outlet tube, resulting in a small foaming space. Therefore, foam pumps of this type generally have low foaming volume and insufficiently fine and uniform foaming.

[0004] To address the above issues, we offer a solution. Utility Model Content

[0005] This utility model aims to solve at least one of the technical problems existing in the prior art. To this end, this utility model proposes an inverted extrusion pump, and the technical solution adopted is as follows:

[0006] An inverted extrusion pump includes a pump body with an extrusion head at the top and an extrusion nozzle on the extrusion head. The pump body includes an exhaust channel, a liquid discharge channel, a first foaming chamber, a foaming outlet, and a liquid inlet channel. The lower end of the foaming outlet is connected to the first foaming chamber. A suction tube is connected to the lower end of the pump body, and the suction tube is only in contact with air when the pump body is inverted. The lower end of the exhaust channel is connected to the suction tube. Both the exhaust channel and the liquid discharge channel include at least one L-shaped cavity, and the ends of the exhaust channel and the liquid discharge channel are arranged opposite to each other. The ends of the exhaust channel and the liquid discharge channel are connected to the first foaming chamber. Gas and liquid enter the ends of the exhaust channel and the liquid discharge channel after passing through the L-shaped cavities, and the two converge and enter the first foaming chamber. The lower end of the liquid inlet channel is connected to the foaming outlet, and the upper end is connected to the extrusion nozzle.

[0007] According to an embodiment of the present invention, an inverted extrusion pump includes a discharge head, a cavity therein, a central tube inside the cavity, the central tube extending upward to form an air outlet, and the bottom of the central tube connected to a suction pipe; a liquid outlet is provided on the pump body around the air outlet, and the liquid outlet is connected to a drainage channel.

[0008] According to an embodiment of the present invention, an inverted extrusion pump includes a pump body comprising a foaming body, the foaming body comprising an inner cylinder, a middle cylinder, and an outer cylinder, wherein a first foaming cavity is located within the middle cylinder cavity; an air outlet communicates with the inner cylinder cavity, and a liquid outlet communicates with the outer cylinder cavity; an L-shaped liquid guide groove communicating with the outer cylinder cavity and the first foaming cavity is provided on the cylinder wall of the middle cylinder on the side facing the first foaming cavity, and an L-shaped air guide groove communicating with the inner cylinder cavity and the first foaming cavity is provided on the cylinder wall of the inner cylinder on the side facing the first foaming cavity; the ends of the liquid guide groove and the ends of the air guide groove are arranged opposite to each other; a foaming outlet is provided on the foaming body, with its lower part directly facing the first foaming cavity; the middle tube, air outlet, middle cylinder cavity, and air guide groove communicate to form an exhaust channel; the liquid outlet, outer cylinder cavity, and liquid guide groove communicate to form a discharge channel; and the discharge head and the foaming body are assembled in alignment.

[0009] According to an embodiment of the present invention, an inverted extrusion pump is provided on the side of the discharge head, the end air inlet is provided, the end air inlet extends laterally through the discharge head to form an end air inlet chamber, and the end of the end air inlet chamber is connected to the middle tube.

[0010] According to an embodiment of the present invention, an inverted extrusion pump is provided with a third air inlet at its upper end. The third air inlet extends downward into the outer cylinder cavity and is directly opposite the end air inlet below it.

[0011] According to an embodiment of the present invention, an inverted extrusion pump is provided in the foam body, the PE elastic valve including a pair of elastic valve plates respectively corresponding to the third air inlet and the foam outlet.

[0012] According to an embodiment of the present invention, an inverted extrusion pump includes a base sleeve with a base cavity. A second air inlet is provided on the outer periphery of the upper end of the base sleeve, and the second air inlet is connected downward to the base cavity. A second foaming cavity is provided in the middle of the upper end of the base cavity, and the upper end of the second foaming cavity is connected upward. The foaming body is assembled in the base cavity and the foaming outlet is provided corresponding to the second foaming cavity.

[0013] According to an embodiment of the present invention, an inverted extrusion pump includes an upper sleeve and a base sleeve having an upper sleeve cavity. The upper sleeve has a first air inlet hole on its upper outer periphery, which is connected downward to the upper sleeve cavity. A third foaming cavity is provided in the middle of the upper end of the upper sleeve cavity, and the upper end of the third foaming cavity is open upward. The base sleeve is assembled in the upper sleeve cavity, and a second foaming cavity is provided corresponding to the third foaming cavity.

[0014] According to an embodiment of the present invention, an inverted extrusion pump is provided in the third foaming chamber, and the upper end of the second foaming chamber is connected to the third foaming chamber through the guide tube.

[0015] According to an embodiment of the present invention, an inverted extrusion pump has an extrusion nozzle located at the upper end of an extrusion head; an extrusion head seat is provided at the lower part of the extrusion head, the extrusion head seat including an extrusion seat sleeve and an extrusion inner sleeve, the extrusion seat sleeve being installed outside an upper seat sleeve, the first air inlet being directly opposite the inner cavity of the extrusion seat sleeve, and the third foaming chamber being directly opposite the inner cavity of the extrusion inner sleeve; the extrusion nozzle is connected downward to the inner cavity of the extrusion inner sleeve; the second foaming chamber, the guide tube, the third foaming chamber, and the inner cavity of the extrusion inner sleeve are connected to form an upper liquid channel.

[0016] An extrusion bottle comprising an inverted extrusion pump as described in any of the preceding claims.

[0017] Compared with the prior art, the beneficial effects of this utility model are:

[0018] In this invention, air is discharged through a suction tube and an exhaust channel, and liquid is discharged through a drainage channel. Both the exhaust channel and the drainage channel include at least one L-shaped cavity, and their ends are positioned opposite each other. Since there is only one exhaust channel and one drainage channel, the gas and liquid are not separated during discharge. After discharge, sufficient gas and liquid meet and counteract each other, which can quickly converge to form rich and fine foam. After convergence, the foam enters the first foaming chamber and the liquid inlet channel for full convergence, providing sufficient foaming time. The foam pump provided by this invention is suitable for inverted extrusion, has good foaming effect, and produces rich, uniform, and fine foam. Attached Figure Description

[0019] The above and / or additional aspects and advantages of this utility model will become apparent and readily understood from the description of the embodiments taken in conjunction with the following drawings, in which:

[0020] Figure 1 This is a three-dimensional schematic diagram of an extrusion bottle using an inverted extrusion pump in an embodiment of this utility model;

[0021] Figure 2 This is a cross-section of the extruded bottle using an inverted extrusion pump in an embodiment of this utility model. Figure 1 ;

[0022] Figure 3 This is a cross-section of the extruded bottle using an inverted extrusion pump in an embodiment of this utility model. Figure 2 ;

[0023] Figure 4 for Figure 2 A magnified view of a portion of the image;

[0024] Figure 5 for Figure 3 A magnified view of a portion of the image;

[0025] Figure 6 Disassembly of the extrusion bottle using the inverted extrusion pump in this embodiment of the invention. Figure 1 ;

[0026] Figure 7 Disassembly of the extrusion bottle using the inverted extrusion pump in this embodiment of the invention. Figure 2 ;

[0027] Figure 8 This is a three-dimensional schematic diagram of the base sleeve of the inverted extrusion pump in an embodiment of this utility model. Figure 1 ;

[0028] Figure 9 This is a three-dimensional schematic diagram of the base sleeve of the inverted extrusion pump in an embodiment of this utility model. Figure 2 ;

[0029] Figure 10 This is a three-dimensional schematic diagram of the foam body of the inverted extrusion pump in an embodiment of the present invention. Figure 1 ;

[0030] Figure 11 This is a three-dimensional schematic diagram of the foam body of the inverted extrusion pump in an embodiment of the present invention. Figure 2 ;

[0031] Figure 12 This is a three-dimensional schematic diagram of the discharge head of the inverted extrusion pump in an embodiment of the present invention. Figure 1 ;

[0032] Figure 13 This is a three-dimensional schematic diagram of the discharge head of the inverted extrusion pump in an embodiment of the present invention. Figure 2 .

[0033] Explanation of key component symbols:

[0034] 10. Bottle body; 20. Extruder head; 21. Extrusion nozzle; 30. Straw; 40. Discharge head; 41. Middle tube; 42. Air outlet; 43. Liquid outlet; 44. End air inlet; 45. End air inlet chamber; 50. Foaming body; 51. Inner cylinder; 52. Middle cylinder; 53. Outer cylinder; 54. First foaming chamber; 55. Liquid guide groove; 56. Air guide groove; 57. Foaming outlet; 58. Third air inlet; 60. PE elastic valve; 70. Base sleeve; 71. Base cylinder cavity; 72. Second air inlet; 73. Second foaming chamber; 80. Upper seat sleeve; 81. Upper seat cylinder cavity; 82. First air inlet; 83. Third foaming chamber; 90. Extruder head seat; 91. Extrusion seat sleeve; 92. Extrusion inner sleeve; 100. Guide tube. Detailed Implementation

[0035] The embodiments of this utility model are described in detail below. Examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout.

[0036] The orientation shown in the accompanying drawings should not be construed as limiting the specific protection scope of this utility model, but is only for reference and understanding of preferred embodiments. The product components shown in the drawings can be changed in position, increased in number, or simplified in structure.

[0037] The “connection” described in the specification and the “connection” relationship between the components shown in the accompanying drawings can be understood as a fixed connection, a detachable connection, or a connection that forms an integral unit; it can be a direct connection or a connection through an intermediate medium. Those skilled in the art can understand the connection relationship according to the specific circumstances and can derive different implementation methods such as screwing, riveting, welding, snap-fitting, or embedding to suitably replace the connection.

[0038] The directional terms such as up, down, left, right, top, and bottom mentioned in the instruction manual and the directions shown in the attached drawings indicate that the components can directly contact each other or contact each other through other features; for example, "up" can mean directly above or diagonally above, or it simply means above other objects; other directions can be understood by analogy.

[0039] The materials used to manufacture solid-shaped parts as shown in the specification and drawings may be metallic, non-metallic, or other synthetic materials. The machining processes used for solid-shaped parts may include stamping, forging, wire cutting, laser cutting, casting, injection molding, CNC milling, 3D printing, machining, etc. Those skilled in the art may adapt or combine the above materials and manufacturing processes according to different processing conditions, costs, and precision requirements.

[0040] This utility model provides an inverted extrusion pump, such as Figures 1 to 13As shown, it includes a pump body, with an extrusion head 20 on the upper part of the pump body, and an extrusion nozzle 21 on the extrusion head 20; the pump body includes an exhaust channel, a liquid discharge channel, a first foaming chamber 54, a foaming outlet 57, and a liquid inlet channel; the lower end of the foaming outlet 57 is connected to the first foaming chamber 54; a suction tube 30 is connected to the lower end of the pump body, and the suction tube 30 is only in contact with air when the pump body is inverted, and the lower end of the exhaust channel is connected to the suction tube 30; both the exhaust channel and the liquid discharge channel include at least one L-shaped cavity, and the ends of the exhaust channel and the liquid discharge channel are arranged opposite to each other, and the ends of the exhaust channel and the liquid discharge channel are connected to the first foaming chamber 54, and the gas and liquid enter the ends of the exhaust channel and the liquid discharge channel after passing through the L-shaped cavity respectively, and the two converge and enter the first foaming chamber 54; the lower end of the liquid inlet channel is connected to the foaming outlet 57, and the upper end is connected to the extrusion nozzle 21.

[0041] This invention also provides an extrusion bottle using the aforementioned inverted extrusion pump, such as... Figures 1 to 5 As shown, the inverted extrusion pump is installed at the mouth of the extrusion bottle.

[0042] Under normal conditions, the lower end of the straw 30 connects to the body of the extrusion bottle and extends to the bottom of the bottle body 10. In use, the bottle body 10 is inverted. The liquid inside flows towards the side of the bottle body 10 closest to the inverted extrusion pump under gravity, and the air inside the bottle is expelled to the bottom of the bottle body 10. At this time, the end of the straw 30 is located at the bottom of the bottle body 10 and is only in contact with the air. Pressing / squeezing the bottle body 10 compresses the air inside the bottle and expels it through the end of the straw 30 towards the top of the straw 30, towards the exhaust channel. The liquid inside the bottle is also squeezed out and discharged towards the drain. After entering the exhaust channel and the liquid discharge channel respectively, the gas and liquid pass through the L-shaped cavity and then enter the end of the exhaust channel and the liquid discharge channel respectively. After exiting the end, they converge and enter the first foaming chamber 54. Since there is only one exhaust channel and one liquid discharge channel, the gas and liquid will not be separated when they are discharged. After being discharged, the gas and liquid meet and collide, which can quickly converge to form rich and fine foam and gather in the first foaming chamber 54. Then, it is squeezed out in the first foaming chamber 54 and sprayed out through the foaming outlet 57 and the liquid inlet channel to the extrusion nozzle 21.

[0043] In this invention, air is discharged through the straw 30 and the exhaust channel, and liquid is discharged through the drain channel. Both the exhaust channel and the drain channel include at least one L-shaped cavity, and their ends are arranged opposite to each other. Since there is only one exhaust channel and one drain channel, the gas and liquid are not separated during discharge. After discharge, sufficient gas and liquid meet and counteract each other, which can quickly converge to form rich and fine foam. After convergence, the foam enters the first foaming chamber 54 and the liquid inlet channel for full convergence, providing sufficient foaming time. The foam pump provided by this invention is suitable for inverted extrusion, has good foaming effect, and produces rich, uniform, and fine foam.

[0044] In a further embodiment, such as Figure 2 , 3 As shown in Figures 4, 5, 6, 7, 12, and 13, the pump body includes a discharge head 40, which has a cavity inside. A central tube 41 is located within the cavity, extending upwards to form an air outlet 42. The air outlet 42 connects to an air outlet channel, and the bottom of the central tube 41 is connected to a suction tube 30. A liquid outlet 43 is located on the pump body around the air outlet 42, connecting to a liquid discharge channel. During extrusion, air is forced into the suction tube 30 and then discharged through the air outlet 42 to the exhaust channel, while liquid is forced through the liquid outlet 43 into the liquid discharge channel.

[0045] An end air inlet 44 is provided on the side of the discharge head 40. The end air inlet 44 extends laterally through the discharge head 40 to form an end air inlet chamber 45. The end of the end air inlet chamber 45 is connected to the middle tube 41. During air return, outside air enters the end air inlet 44, then passes through the end air inlet chamber 45 into the middle tube 41, and then flows back into the extrusion bottle through the suction tube 30.

[0046] In a further embodiment, such as Figure 2 , 3As shown in Figures 4, 5, 6, 7, 10, and 11, the pump body includes a foaming body 50, which includes an inner cylinder 51, a middle cylinder 52, and an outer cylinder 53. The first foaming cavity 54 is located inside the middle cylinder 52. The air outlet 42 communicates with the inner cylinder 51, and the liquid outlet 43 communicates with the outer cylinder 53. The middle cylinder 52 has an L-shaped liquid guide groove 55 on its wall facing the first foaming cavity 54, which connects the outer cylinder 53 and the first foaming cavity 54. The inner cylinder 51 has an L-shaped liquid guide groove 55 on its wall facing the first foaming cavity 54. An L-shaped air guide groove 56 is provided on one side of the cylinder wall of cavity 54, connecting the inner cylinder 51 cavity and the first foaming cavity 54; the end of the liquid guide groove 55 and the end of the air guide groove 56 are arranged opposite each other; the foaming outlet 57 is provided on the foaming body 50, and its lower part is directly opposite the first foaming cavity 54; the middle tube 41, the air outlet 42, the middle cylinder 52 cavity and the air guide groove 56 are connected to form an exhaust channel; the liquid outlet 43, the outer cylinder 53 cavity and the liquid guide groove 55 are connected to form a liquid discharge channel; the discharge head 40 and the foaming body 50 are aligned and assembled. After being squeezed out, the gas enters the inner cylinder 51 cavity, and then enters the middle cylinder 52 cavity along the air guide groove 56. At the same time, after being squeezed out, the liquid enters the outer cylinder 53 cavity, and then enters the middle cylinder 52 cavity along the liquid guide groove 55. Finally, the two meet, collide and converge to form foam.

[0047] In a further embodiment, such as Figure 2 , 3 As shown in 4, 5, 6, 7, 10, and 11, the foam body 50 has a third air inlet 58 at its upper end. The third air inlet 58 extends downward into the cavity of the outer cylinder 53 and is directly opposite the end air inlet 44. During air return, external air enters the third air inlet 58 and then enters the end air inlet 44 through the cavity of the outer cylinder 53.

[0048] To prevent foam from flowing out after inversion and to prevent air backflow during extrusion, in a further embodiment, such as Figure 2 , 3 As shown in Figures 4 and 5, a PE elastic valve 60 is provided inside the foam body 50. The PE elastic valve 60 includes a pair of elastic valve plates, which are respectively set corresponding to the third air inlet 58 and the foam outlet 57. During extrusion, under the condition of internal extrusion pressure, the elastic valve plate at the foam outlet 57 is pushed open, and the foam can be extruded. During air recirculation, the internal negative pressure and the external air push open the elastic valve plate at the third air inlet 58, so that the air can recirculate through the third air inlet 58.

[0049] In a further embodiment, such as Figure 2 , 3As shown in Figures 4, 5, 6, 7, 8, and 9, the pump body includes a base sleeve 70, which has a base cavity 71. A second air inlet 72 is provided on the outer periphery of the upper end of the base sleeve 70, and the second air inlet 72 connects downwards to the base cavity 71. A second foaming cavity 73 is provided in the middle of the upper end of the base cavity 71, and the upper end of the second foaming cavity 73 extends upwards. The foaming body 50 is assembled inside the base cavity 71, and the foaming outlet 57 is corresponding to the second foaming cavity 73. After the foam is extruded from the foaming outlet 57, it enters the second foaming cavity 73 to foam, and finally sprays out along the upper liquid channel. During air return, external air enters the second air inlet 72, then enters the base cavity 71, and then enters the third air inlet 58.

[0050] In a further embodiment, such as Figure 2 , 3 As shown in Figures 4, 5, 6, and 7, the pump body includes an upper seat sleeve 80, and a base sleeve 70 having an upper seat cavity 81. The upper seat sleeve 80 has a first air inlet 82 on its upper outer periphery, which is connected downward to the upper seat cavity 81. A third foaming cavity 83 is provided in the middle of the upper end of the upper seat cavity 81, and the upper end of the third foaming cavity 83 is connected upward. The base sleeve 70 is assembled in the upper seat cavity 81, and the second foaming cavity 73 is arranged corresponding to the third foaming cavity 83. A guide tube 100 is provided in the third foaming cavity 83, and the upper end of the second foaming cavity 73 is connected to the third foaming cavity 83 through the guide tube 100.

[0051] After the foam is extruded through the second foaming chamber 73, it enters the third foaming chamber 83 of the upper seat chamber 81 through the guide tube 100 for foaming, and finally sprays out along the upper liquid channel; during the return air, external air enters the first air inlet 82, then enters the upper seat chamber 81, and then enters the second air inlet 72.

[0052] In a further embodiment, such as Figure 2 , 3 As shown in Figures 4, 5, 6, and 7, the extrusion nozzle 21 is located at the upper end of the extrusion head 20; the lower part of the extrusion head 20 is provided with an extrusion head seat 90, which includes an extrusion seat sleeve 91 and an extrusion inner sleeve 92. The extrusion seat sleeve 91 is installed outside the upper seat sleeve 80, the first air inlet 82 is directly opposite the inner cavity of the extrusion seat sleeve 91, and the third foaming chamber 83 is directly opposite the inner cavity of the extrusion inner sleeve 92; the extrusion nozzle 21 is connected downward to the inner cavity of the extrusion inner sleeve 92. The second foaming chamber 73, the guide tube 100, the third foaming chamber 83, and the inner cavity of the extrusion inner sleeve 92 are connected to form an upper liquid channel.

[0053] After the foam is extruded through the third foaming chamber 83, it enters the inner cavity of the extrusion inner sleeve 92 and is finally ejected from the extrusion nozzle 21. During the return air process, external air enters the inner cavity of the extrusion seat sleeve 91 and then enters the first air inlet 82.

[0054] Although the present invention has been described in detail with reference to the above embodiments, it will be apparent to those skilled in the art that various changes or modifications can be made to the present invention without departing from the principles and spirit of the present invention as defined by the claims. Therefore, the detailed description of the embodiments in this disclosure is for explanation only and not for limiting the present invention, but rather the scope of protection is defined by the content of the claims.

Claims

1. An inverted extrusion pump, characterized in that, It includes a pump body, an extrusion head (20) is provided on the upper part of the pump body, and an extrusion nozzle (21) is provided on the extrusion head (20); the pump body includes an exhaust channel, a liquid discharge channel, a first foaming chamber (54), a foaming outlet (57) and a liquid inlet channel; the lower end of the foaming outlet (57) is connected to the first foaming chamber (54); a suction tube (30) is connected to the lower end of the pump body, the suction tube (30) is only in contact with air when the pump body is inverted, and the lower end of the exhaust channel is connected to the suction tube (30); both the exhaust channel and the liquid discharge channel include at least one L-shaped cavity, and the ends of the exhaust channel and the liquid discharge channel are arranged opposite to each other, and the ends of the exhaust channel and the liquid discharge channel are connected to the first foaming chamber (54); the lower end of the liquid inlet channel is connected to the foaming outlet (57), and the upper end is connected to the extrusion nozzle (21).

2. The inverted extrusion pump according to claim 1, characterized in that, The pump body includes a discharge head (40), which has a cavity inside. A middle tube (41) is provided in the cavity. The middle tube (41) extends upward to form an air outlet (42). The bottom of the middle tube (41) is connected to a suction tube (30). A liquid outlet (43) is provided on the pump body around the air outlet (42). The liquid outlet (43) is connected to the liquid discharge channel.

3. An inverted extrusion pump according to claim 2, characterized in that, The pump body includes a foaming body (50), which includes an inner cylinder (51), a middle cylinder (52), and an outer cylinder (53). The first foaming cavity (54) is located inside the middle cylinder (52). The air outlet (42) is connected to the inner cylinder (51), and the liquid outlet (43) is connected to the outer cylinder (53). The middle cylinder (52) has an L-shaped liquid guide groove (55) on its side facing the first foaming cavity (54) that connects the outer cylinder (53) and the first foaming cavity (54). The inner cylinder (51) has an L-shaped liquid guide groove (55) on its side facing the first foaming cavity (54) that connects the outer cylinder (53) and the first foaming cavity (54). An L-shaped air guide groove (56) is provided on the upper part, connecting the inner cylinder (51) cavity and the first foaming cavity (54); the end of the liquid guide groove (55) and the end of the air guide groove (56) are arranged opposite to each other; the foaming outlet (57) is provided on the foaming body (50), and its lower part is directly opposite the first foaming cavity (54); the middle tube (41), the air outlet (42), the middle cylinder (52) cavity and the air guide groove (56) are connected to form an exhaust channel; the liquid outlet (43), the outer cylinder (53) cavity and the liquid guide groove (55) are connected to form a liquid discharge channel; the discharge head (40) and the foaming body (50) are aligned and assembled with each other.

4. An inverted extrusion pump according to claim 3, characterized in that, An end air inlet (44) is provided on the side of the discharge head (40). The end air inlet (44) extends laterally through the discharge head (40) to form an end air inlet chamber (45). The end of the end air inlet chamber (45) is connected to the middle pipe (41).

5. An inverted extrusion pump according to claim 4, characterized in that, The foam body (50) has a third air inlet (58) at its upper end. The third air inlet (58) extends downward into the cavity of the outer cylinder (53) and is directly below the end air inlet (44).

6. An inverted extrusion pump according to claim 4, characterized in that, A PE elastic valve (60) is provided inside the foam body (50). The PE elastic valve (60) includes a pair of elastic valve plates, which are respectively set to the third air inlet (58) and the foam outlet (57).

7. An inverted extrusion pump according to claim 5, characterized in that, The pump body includes a base sleeve (70), the base sleeve (70) has a base cavity (71), the base sleeve (70) has a second air inlet (72) on its upper outer periphery, the second air inlet (72) is connected downward to the base cavity (71); a second foaming cavity (73) is provided in the middle of the upper end of the base cavity (71), the upper end of the second foaming cavity (73) is connected upward; the foaming body (50) is assembled in the base cavity (71) and the foaming outlet (57) is set corresponding to the second foaming cavity (73).

8. An inverted extrusion pump according to claim 7, characterized in that, The pump body includes an upper seat sleeve (80), and the base sleeve (70) has an upper seat cavity (81). The upper seat sleeve (80) has a first air inlet (82) on its upper outer periphery, and the first air inlet (82) is connected downward to the upper seat cavity (81). A third foaming cavity (83) is provided in the middle of the upper end of the upper seat cavity (81), and the upper end of the third foaming cavity (83) is connected upward. The base sleeve (70) is assembled in the upper seat cavity (81), and the second foaming cavity (73) is set corresponding to the third foaming cavity (83).

9. An inverted extrusion pump according to claim 8, characterized in that, A guide tube (100) is provided in the third foaming chamber (83), and the upper end of the second foaming chamber (73) is connected to the third foaming chamber (83) through the guide tube (100).

10. An inverted extrusion pump according to claim 8, characterized in that, The extrusion nozzle (21) is located at the upper end of the extrusion head (20); the lower part of the extrusion head (20) is provided with an extrusion head seat (90), the extrusion head seat (90) includes an extrusion seat sleeve (91) and an extrusion inner sleeve (92), the extrusion seat sleeve (91) is installed outside the upper seat sleeve (80), the first air inlet (82) is directly opposite the inner cavity of the extrusion seat sleeve (91), the third foaming chamber (83) is directly opposite the inner cavity of the extrusion inner sleeve (92); the extrusion nozzle (21) is connected downward to the inner cavity of the extrusion inner sleeve (92); the second foaming chamber (73), the guide tube (100), the third foaming chamber (83), and the inner cavity of the extrusion inner sleeve (92) are connected to form an upper liquid channel.

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