Foam pump with external spring

Abstract

The utility model discloses a foam pump with an external spring, which relates to the technical field of foam pumps and comprises an outer cover, a pressing head, an air cylinder, a liquid pump barrel, an air pump piston and a liquid pump piston component, the pressing head is arranged at the top of the outer cover, the air cylinder is fixedly connected with the outer cover, the liquid pump barrel is connected with the bottom of the air cylinder, and the top of the air pump piston is sleeved in the pressing head. The bottom of the air pump piston abuts against the inner wall of the air cylinder, the top of the liquid pump piston assembly is arranged in the air pump piston in a sleeved mode, the bottom of the liquid pump piston assembly is installed at the connecting position of the air cylinder and the liquid pump cylinder, and the liquid pump piston assembly is sleeved with a spring. Linkage of the pressing head and the liquid pump piston assembly is achieved, foam discharging of the foam pump is achieved, and assembling is simpler.

Description

Technical Field

[0001] The utility model relates to the technical field of foam pumps, in particular to an external spring foam pump. Background Art

[0002] Chinese patent CN220683350U discloses an external spring foam pump, the spring inside of which is not in the liquid pump chamber, so the spring will not directly contact the liquid and has a longer service life. At the same time, its air pump piston assembly moves with the pressing piece and plays a role in pushing the liquid pump piston assembly. However, the air pump piston assembly includes two components, an annular blade and an annular piston. During production and assembly, the two need to be assembled into one and then assembled with the liquid pump piston assembly. The assembly steps are cumbersome, and the air pump piston assembly needs to move in the receiving groove with the help of a resistance rod to push the liquid pump piston assembly, which places high requirements on assembly accuracy. Utility Model Content

[0003] In view of the defects of the prior art mentioned above, the purpose of the utility model is to provide an external spring foam pump to solve the problem of difficult assembly of the air pump piston assembly.

[0004] The purpose of the utility model is achieved by the following technical solutions:

[0005] An external spring foam pump comprises an outer cover, a pressing head, a cylinder, a liquid pump barrel, an air pump piston and a liquid pump piston assembly, wherein the pressing head is arranged on the top of the outer cover, the cylinder is fixedly connected to the outer cover, the liquid pump barrel is connected to the bottom of the cylinder, the top of the air pump piston is sleeved in the pressing head, the air pump piston moves with the pressing head, the bottom of the air pump piston abuts against the inner wall of the cylinder, the top of the liquid pump piston assembly is sleeved in the air pump piston, the liquid pump piston assembly moves with the air pump piston, and the bottom is installed at the connecting position of the cylinder and the liquid pump barrel, a spring is arranged on the outer sleeve of the liquid pump piston assembly, and the spring moves with the liquid pump piston assembly in the cylinder.

[0006] Furthermore, the liquid pump piston assembly includes a piston seat and a piston rod sleeved in the piston seat, the top of the piston seat is sleeved in the air pump piston, a sealing ring is provided at the top of the liquid pump barrel, the bottom of the sealing ring seals the liquid pump barrel, and the top of the sealing ring is sleeved on the bottom of the piston seat and seals the bottom of the piston seat.

[0007] Furthermore, the sealing ring is hollow inside, the bottom of the piston rod is sleeved outside the sealing ring, a limit block is provided inside the sealing ring, the bottom end of the piston rod is restricted in the liquid pump barrel by the limit block, and the bottom of the piston seat moves under the guidance of the top of the sealing ring.

[0008] Further, a protruding vertical rib is provided on the piston rod. In the non-pressed state, the vertical rib does not contact the limit block. When the liquid pump piston assembly moves downward, the vertical rib can abut against the limit block and drive the sealing ring to move downward.

[0009] Further, a spring seat is fixed to the bottom of the cylinder, a limit ring is fixed to the top of the liquid pump piston assembly, the top of the spring abuts against the limit ring and the bottom is arranged in the spring seat. An annular first assembly strip is fixedly provided upward on the outer periphery of the limit ring, and an annular first assembly hole is provided at the bottom of the air pump piston. The first assembly strip is fixed in the first assembly hole.

[0010] Further, a second assembly hole is provided on the limit ring. A second assembly strip and a third assembly strip are fixed to the bottom of the first assembly strip. The second assembly strip is fixed in the second assembly hole, the third assembly strip abuts against the air pump piston, and the second assembly strip and the third assembly strip are respectively arranged on both sides of the first assembly strip.

[0011] Further, the first assembly strip, the second assembly strip and the third assembly strip are of an integral structure.

[0012] Further, a groove is provided at the bottom of the cylinder, and the spring seat is fixed in the groove.

[0013] Further, a friction net is fixed in the pressing head. The bottom of the friction net is sleeved on the top of the air pump piston, and a limit shoulder for restricting the movement of the friction net is provided above the friction net in the pressing head.

[0014] Further, a limit cavity is provided in the liquid pump cylinder, and a glass ball is provided in the limit cavity. The glass ball can block or not block the limit cavity.

[0015] Further, a foam channel is provided in the pressing head, and the top of the air pump piston is sleeved in the foam channel.

[0016] Compared with the prior art, the present utility model uses an air pump piston with an integral structure to connect the pressing head and the liquid pump piston assembly at the same time, so that the air pump piston moves together with the pressing head, and the liquid pump piston assembly moves together with the air pump piston, realizing the linkage of the pressing head and the liquid pump piston assembly, realizing the foaming of the foam pump, and the assembly is simpler. Description of the Drawings

[0017] Figure 1 is a schematic structural diagram of an external spring foam pump without an annular blade of the present utility model;

[0018] Figure 2 is a sectional view of an external spring foam pump without an annular blade of the present utility model;

[0019] Figure 3 is Figure 2 an enlarged view of area A in it;

[0020] Figure 4 is a schematic structural view of the air pump piston in the present utility model;

[0021] Figure 5 is a sectional view of the air pump piston in the present utility model;

[0022] Figure 6 is a sectional view of the connection position between the cylinder and the liquid pump cylinder in the present utility model;

[0023] Figure 7 is a schematic structural view of the piston rod in the present utility model.

[0024] In the figure: 1. Outer cover; 2. Pressing head; 3. Cylinder; 4. Liquid pump cylinder; 5. Air pump piston; 6. Liquid pump piston assembly; 601. Piston seat; 602. Piston rod; 7. Spring; 8. Sealing ring; 9. Limiting block; 10. Spring seat; 11. Limiting ring; 12. First assembly strip; 13. First assembly hole; 14. Second assembly hole; 15. Second assembly strip; 16. Third assembly strip; 17. Groove; 18. Friction net; 19. Limiting shoulder; 20. Limiting cavity; 21. Glass ball; 22. Foam channel; 23. Tapered block; 24. Vertical rib. Detailed implementation manners

[0025] In order to make the technical problems, technical solutions and beneficial effects solved by the utility model more clear and understandable, the following further describes the utility model in conjunction with the accompanying drawings and embodiments.

[0026] As Figures 1 to 7 shown, the present utility model provides an external spring foam pump, which includes an outer cover 1, a pressing head 2, a cylinder 3, a liquid pump cylinder 4, an air pump piston 5 and a liquid pump piston assembly 6. The pressing head 2 is arranged on the top of the outer cover 1. The cylinder 3 is fixedly connected to the outer cover 1. The liquid pump cylinder 4 is connected to the bottom of the cylinder 3. The top of the air pump piston 5 is sleeved in the pressing head 2. The air pump piston 5 moves with the pressing head 2. The bottom of the air pump piston 5 abuts against the inner wall of the cylinder 3. The top of the liquid pump piston assembly 6 is sleeved in the air pump piston 5. The liquid pump piston assembly 6 moves with the air pump piston 5 and is installed at the connection position between the cylinder 3 and the liquid pump cylinder 4 at the bottom. A spring 7 is sleeved outside the liquid pump piston assembly 6. The spring 7 moves with the liquid pump piston assembly 6 in the cylinder 3.

[0027] The air pump piston 5 moves together with the pressing head 2. The liquid pump piston assembly 6 moves together with the air pump piston 5. The spring 7 compresses and moves within the cylinder 3. The air pump piston 5 is an integral structure that simultaneously connects the pressing head 2 and the liquid pump piston assembly 6. Even without a ring vane, it can simultaneously link the pressing head 2 and the liquid pump piston assembly 6 to achieve foam pumping, making the assembly simpler and more convenient.

[0028] Reference Figure 2 , the liquid pump piston assembly 6 includes a piston seat 601 and a piston rod 602 sleeved within the piston seat 601. The top of the piston seat 601 is sleeved within the air pump piston 5. A sealing ring 8 is provided at the top of the liquid pump cylinder 4. The bottom of the sealing ring 8 seals the liquid pump cylinder 4. The top of the sealing ring 8 is sleeved on the bottom of the piston seat 601 and seals the bottom of the piston seat 601. Under the sealing of the bottom of the sealing ring 8, the liquid in the liquid pump cylinder 4 can only enter within the sealing ring 8 and will not enter the cylinder 3. Under the sealing of the top of the sealing ring 8, the liquid that enters within the sealing ring 8 can only enter between the piston seat 601 and the piston rod 602. The liquid enters the liquid pump piston assembly 6 after passing through the inside of the sealing ring 8 from the liquid pump cylinder 4. The spring 7 is sleeved outside the liquid pump piston assembly 6. Therefore, the spring 7 does not directly contact the liquid, and the spring 7 will not be corroded by the liquid, resulting in a longer service life.

[0029] The inside of the sealing ring 8 is hollow. The bottom of the piston rod 602 is sleeved outside the sealing ring 8. A limiting block 9 is provided within the sealing ring 8. The bottom end of the piston rod 602 is restricted within the liquid pump cylinder 4 by the limiting block 9. The bottom of the piston seat 601 moves under the guidance of the top of the sealing ring 8. That is to say, although the bottom of the piston seat 601 is sealed by the sealing ring 8, the piston seat 601 is still movable relative to the sealing ring 8.

[0030] It should be noted that a tapered block 23 is provided at the bottom end of the piston rod 602. The top surface of the tapered block 23 abuts against and seals the bottom surface of the limiting block 9. The limiting block 9 separates the piston rod 602 and the tapered block 23, ensuring that the tapered block 23 can only move below the limiting block 9.

[0031] Reference Figure 7, there is a protruding vertical rib 24 on the piston rod 602. In the un-pressed state, the vertical rib 24 does not contact the limit block 9, that is to say, there is a certain distance between the vertical rib 24 and the limit block 9 at this time. When the liquid pump piston assembly 6 moves downward, the vertical rib 24 moves downward, the conical block 23 disengages from the limit block 9, and the liquid begins to enter between the piston seat 601 and the piston rod 602. When the vertical rib 24 abuts against the limit block 9, the vertical rib 24 can drive the sealing ring 8 to continue moving downward. At this time, the vertical rib 24 does not completely seal the limit block 9, and the liquid can still enter between the piston seat 601 and the piston rod 602 through the gap between the vertical rib 24 and the limit block 9; when the liquid pump piston assembly 6 moves upward under the action of the spring 7, the conical block 23 at the bottom of the piston rod 602 will push the sealing ring 8 to move upward again until the sealing ring 8 stops moving when it abuts against the spring seat 10.

[0032] Reference Figure 2 and Figure 6 , a spring seat 10 is fixed at the bottom of the cylinder 3, a limit ring 11 is fixed at the top of the liquid pump piston assembly 6, the limit ring 11 is fixed on the piston seat 601, the top of the spring 7 abuts against the limit ring 11 and the bottom is fixedly arranged in the spring seat 10. An annular first assembly strip 12 is fixedly arranged upward on the outer periphery of the limit ring 11, and an annular first assembly hole 13 is arranged at the bottom of the air pump piston 5. The first assembly strip 12 is fixed in the first assembly hole 13. The first assembly hole 13 and the first assembly strip 12 cooperate to fix the air pump piston 5 and the liquid pump piston assembly 6, ensuring that the liquid pump piston assembly 6 moves with the air pump piston 5.

[0033] A second assembly hole 14 is formed in the limit ring 11. A second assembly strip 15 and a third assembly strip 16 are fixed at the bottom of the first assembly strip 12. The second assembly strip 15 is fixed in the second assembly hole 14, and the third assembly strip 16 abuts against the air pump piston 5. The second assembly strip 15 and the third assembly strip 16 are respectively arranged on both sides of the first assembly strip 12. Further, the first assembly strip 12, the second assembly strip 15 and the third assembly strip 16 are of an integral structure. Further, a groove 17 is arranged at the bottom of the cylinder 3, and the spring seat 10 is fixed in the groove 17.

[0034] The air pump piston 5 and the liquid pump piston assembly 6 are jointly fixed by the first assembly strip 12 and the second assembly strip 15. The third assembly strip 16 increases the fixing area between the first assembly strip 12 and the air pump piston 5, enhancing the stability. The first assembly strip 12, the second assembly strip 15 and the third assembly strip 16 jointly fix the air pump piston 5 and the liquid pump piston assembly 6, with strong stability. After assembling the air pump piston 5 and the liquid pump piston assembly 6 first, and then installing them into the cylinder 3, the assembly is simple, there is no assembly error problem, and it is more reliable.

[0035] Inside the pressing head 2, a friction net 18 is fixedly installed. The bottom of the friction net 18 is sleeved on the top of the air pump piston 5. Above the friction net 18, the pressing head 2 is provided with a limiting shoulder 19 that restricts the movement of the friction net 18.

[0036] Furthermore, a limiting cavity 20 is provided inside the liquid pump cylinder 4. Inside the limiting cavity 20, a glass ball 21 is provided. The glass ball 21 can move inside the limiting cavity 20 according to the air pressure change. The glass ball 21 can block or not block the limiting cavity 20, thereby realizing whether the liquid pump cylinder 4 allows liquid to pass through.

[0037] Furthermore, a foam channel 22 is provided inside the pressing head 2. The top of the air pump piston 5 and the friction net 18 are both sleeved inside the foam channel 22.

[0038] Working principle: Press the pressing head 2, the air pump piston 5 and the liquid pump piston assembly 6 move, and the spring 7 is compressed. When the pressing stops, the spring 7 resets. Under the action of the pressure difference, the glass ball 21 moves upward and no longer blocks the bottom opening of the limiting cavity 20. The liquid enters the liquid pump cylinder 4 and then enters the liquid pump piston assembly 6. At this time, the gas enters above the liquid pump piston assembly 6 and converges with the liquid inside the liquid pump piston assembly 6 above the liquid pump piston assembly 6 to form foam, and the foam finally discharges from the foam channel 22.

[0039] The air pump piston 5 with an integrated structure of the present utility model is simultaneously connected to the pressing head 2 and the liquid pump piston assembly 6, so that the air pump piston 5 moves together with the pressing head 2, and the liquid pump piston assembly 6 moves together with the air pump piston 5, realizing the linkage of the pressing head 2 and the liquid pump piston assembly 6, realizing the foam pumping of the foam pump, and the assembly is simpler.

[0040] The above are only the preferred embodiments of the present utility model and are not intended to limit the present utility model. Any modifications, equivalent replacements, and improvements made within the spirit and principle of the present utility model shall fall within the protection scope of the present utility model.

Claims

1. An external spring foam pump, characterized in that: The invention comprises an outer cover (1), a pressing head (2), a cylinder (3), a liquid pump barrel (4), an air pump piston (5) and a liquid pump piston assembly (6), wherein the pressing head (2) is arranged at the top of the outer cover (1), the cylinder (3) is fixedly connected to the outer cover (1), the liquid pump barrel (4) is connected to the bottom of the cylinder (3), the top of the air pump piston (5) is sleeved in the pressing head (2), the air pump piston (5) moves with the pressing head (2), the bottom of the air pump piston (5) abuts against the inner wall of the cylinder (3), the top of the liquid pump piston assembly (6) is sleeved in the air pump piston (5), the liquid pump piston assembly (6) moves with the air pump piston (5), and the bottom is installed at the connection position between the cylinder (3) and the liquid pump barrel (4), and a spring (7) is provided on the outer sleeve of the liquid pump piston assembly (6), and the spring (7) moves in the cylinder (3) with the liquid pump piston assembly (6).

2. The external spring foam pump according to claim 1, characterized in that: The liquid pump piston assembly (6) comprises a piston seat (601) and a piston rod (602) sleeved in the piston seat (601); the top of the piston seat (601) is sleeved in the air pump piston (5); a sealing ring (8) is provided at the top of the liquid pump barrel (4); the bottom of the sealing ring (8) seals the liquid pump barrel (4); the top of the sealing ring (8) is sleeved on the bottom of the piston seat (601) and seals the bottom of the piston seat (601).

3. The external spring foam pump according to claim 2, characterized in that: The sealing ring (8) is hollow inside, the bottom of the piston rod (602) is sleeved outside the sealing ring (8), a limit block (9) is provided inside the sealing ring (8), the bottom end of the piston rod (602) is limited in the liquid pump barrel (4) by the limit block (9), and the bottom of the piston seat (601) moves under the guidance of the top of the sealing ring (8).

4. The external spring foam pump according to claim 3, characterized in that: The piston rod (602) is provided with a protruding vertical edge (24). In a non-pressed state, the vertical edge (24) does not contact the limit block (9). When the liquid pump piston assembly (6) moves downward, the vertical edge (24) can abut against the limit block (9) and drive the sealing ring (8) to move downward.

5. The external spring foam pump according to claim 1, characterized in that: A spring seat (10) is fixed at the bottom of the cylinder (3), a limiting ring (11) is fixed at the top of the liquid pump piston assembly (6), the top of the spring (7) abuts against the limiting ring (11) and the bottom is arranged in the spring seat (10), an annular first assembly strip (12) is fixed upward on the outer circumference of the limiting ring (11), an annular first assembly hole (13) is provided at the bottom of the air pump piston (5), and the first assembly strip (12) is fixed in the first assembly hole (13).

6. The external spring foam pump according to claim 5, characterized in that: The limiting ring (11) is provided with a second assembly hole (14); a second assembly bar (15) and a third assembly bar (16) are fixed to the bottom of the first assembly bar (12); the second assembly bar (15) is fixed in the second assembly hole (14); the third assembly bar (16) abuts against the air pump piston (5); and the second assembly bar (15) and the third assembly bar (16) are respectively arranged on both sides of the first assembly bar (12).

7. The external spring foam pump according to claim 6, characterized in that: The first assembly bar (12), the second assembly bar (15) and the third assembly bar (16) are an integrated structure.

8. The external spring foam pump according to claim 5, characterized in that: The bottom of the cylinder (3) is provided with a groove (17), and the spring seat (10) is fixed in the groove (17).

9. The external spring foam pump according to claim 1, characterized in that: A friction net (18) is fixed inside the pressing head (2), the bottom of the friction net (18) is sleeved on the top of the air pump piston (5), and the pressing head (2) is provided with a limiting shoulder (19) above the friction net (18) for limiting the movement of the friction net (18).

10. The external spring foam pump according to claim 1, characterized in that: A limiting cavity (20) is provided in the liquid pump barrel (4), and a glass ball (21) is provided in the limiting cavity (20). The glass ball (21) may block or not block the limiting cavity (20).

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