External foam pump convenient to assemble

Abstract

The external foam pump convenient to assemble comprises a shell, a pressing head, an air pump piston assembly, a liquid pump piston assembly and a plastic spring, the air pump piston assembly comprises an air cylinder, an annular base and an annular piston, the air cylinder is fixed below the shell, and the top of the annular base is inserted into the pressing head and communicated with a foam channel; the bottom of the air cylinder is fixed above the annular piston which abuts against the inner wall of the air cylinder. The liquid pump piston assembly comprises a liquid inlet barrel, a piston seat, a piston rod and a piston barrel, the liquid inlet barrel is fixed to the bottom of the air cylinder and is integrated with the air cylinder, the bottom of the piston seat is inserted into the top of the liquid inlet barrel, the top of the piston barrel is inserted into the annular seat, the bottom of the piston barrel movably sleeves the piston seat, and the piston rod is sleeved with the piston barrel. According to the external foam pump, through a multi-position inserting structure, assembling is easier and more convenient, and through the adoption of the plastic spring, recycling is easier.

Description

Technical Field

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

[0002] Chinese patent CN220683350U discloses an external spring foam pump, in which the external spring is a metal spring. When recycling, the spring needs to be separated from the pump body, which makes recycling difficult. At the same time, the presence of components such as sealing rings increases the difficulty of assembling the foam pump. 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 foam pump that is easy to assemble, so as to solve the problems of recycling and assembly difficulties.

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

[0005] The invention relates to an external foam pump which is easy to assemble, comprising a shell, a pressing head, an air pump piston assembly, a liquid pump piston assembly and a plastic spring, wherein the pressing head can be movably pressed at the top of the shell, and a foam channel is provided in the pressing head; the air pump piston assembly comprises a cylinder, an annular seat and an annular piston, wherein the cylinder is fixed below the shell, the top of the annular seat is inserted in the pressing head and connected to the foam channel, and the bottom is fixed above the annular piston, and the annular piston abuts against the inner wall of the cylinder; the liquid pump piston assembly comprises a liquid inlet cylinder, a piston seat, a piston rod and a piston cylinder, wherein the liquid inlet cylinder is fixed to the bottom of the cylinder and is an integral structure with the cylinder, the bottom of the piston seat is inserted in the top of the liquid inlet cylinder, the top of the piston cylinder is inserted in the annular seat, the bottom is movably sleeved on the piston seat, the piston rod is sleeved in the piston cylinder, and its bottom is inserted and confined in the piston seat; the plastic spring is sleeved outside the piston cylinder and compressed in the cylinder.

[0006] Furthermore, a receiving groove is provided at the bottom of the cylinder, and a spring seat is fixed in the receiving groove; a fixing seat is provided on the upper outer wall of the piston cylinder, and the bottom of the plastic spring abuts against the spring seat, and the top abuts against the fixing seat.

[0007] Furthermore, a partition is provided on the spring seat, and the partition is arranged between the piston cylinder and the plastic spring.

[0008] Furthermore, a fixing seat is provided on the upper outer wall of the piston cylinder, and a first annular groove is opened on the upper part of the fixing seat; a first downward retaining ring is provided on the bottom surface of the annular piston, and a second downward retaining ring is provided on the bottom surface of the annular seat, the first retaining ring is against the inner wall of the first annular groove, and the second retaining ring is squeezed between the first retaining ring and the piston cylinder.

[0009] Furthermore, a clamping block is provided at the bottom of the piston rod, and a limiting block is provided in the piston seat to resist the clamping block.

[0010] Furthermore, a tapered portion is provided at the top of the piston rod, and the cross section of the outer wall of the tapered portion gradually decreases from top to bottom; a boss is provided inside the piston cylinder, and the cross section of the boss gradually increases from top to bottom, and the tapered portion slides along the boss.

[0011] Furthermore, the top surface of the annular piston is provided with an upward third retaining ring, the cross section of the third retaining ring is conical, and the bottom surface of the annular seat is provided with a downward second annular groove, and the third retaining ring is clamped into the second annular groove.

[0012] Furthermore, a friction net is inserted into the top of the annular seat, and the friction net is arranged in the foam channel.

[0013] Furthermore, a limiting member and a blocking ball are provided in the liquid inlet cylinder, and the limiting member restricts the blocking ball in the liquid inlet cylinder.

[0014] Furthermore, the top surface of the pressing head is provided with anti-slip grooves.

[0015] The beneficial effects of the utility model are as follows: the utility model makes assembly easier by adopting a multi-position insertion structure, and makes recycling easier by adopting a plastic spring. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a schematic diagram of the structure of the external foam pump of the utility model which is easy to assemble;

[0017] Figure 2 It is a cross-sectional view of the external foam pump of the utility model which is easy to assemble;

[0018] Figure 3 yes Figure 2 A magnified image of area A;

[0019] Figure 4 The utility model is a cross-sectional exploded view of an external foam pump which is easy to assemble.

[0020] In the figure: 1. shell; 2. pressing head; 3. plastic spring; 4. foam channel; 5. cylinder; 6. annular seat; 7. annular piston; 8. liquid inlet cylinder; 9. piston seat; 10. piston rod; 11. piston cylinder; 12. accommodating groove; 13. spring seat; 14. fixing seat; 15. first annular groove; 16. partition; 17. first retaining ring; 18. second retaining ring; 19. clamping block; 20. limiting block; 21. conical part; 22. boss; 23. third retaining ring; 24. second annular groove; 25. friction net; 26. limiting piece; 27. blocking ball; 28. anti-slip pattern. DETAILED DESCRIPTION

[0021] In order to make the technical problems, technical solutions and beneficial effects solved by the utility model more clearly understood, the utility model is further described below in conjunction with the accompanying drawings and embodiments.

[0022] like Figure 1-4 As shown, the utility model provides an external foam pump that is easy to assemble, including a shell 1, a pressing head 2, an air pump piston assembly, a liquid pump piston assembly and a plastic spring 3. The pressing head 2 can be movably pressed at the top of the shell 1, and a foam channel 4 is opened in the pressing head 2; the air pump piston assembly includes a cylinder 5, an annular seat 6 and an annular piston 7, the cylinder 5 is fixed below the shell 1, the top of the annular seat 6 is inserted in the pressing head 2 and connected to the foam channel 4, and the bottom is fixed above the annular piston 7, and the annular piston 7 against the inner wall of the cylinder 5; the liquid pump piston assembly includes a liquid inlet cylinder 8, a piston seat 9, a piston rod 10 and a piston barrel 11, the liquid inlet cylinder 8 is fixed to the bottom of the cylinder 5 and is an integral structure with the cylinder 5, the bottom of the piston seat 9 is inserted in the top of the liquid inlet cylinder 8, the top of the piston barrel 11 is inserted in the annular seat 6, the bottom is movably sleeved on the piston seat 9, the piston rod 10 is sleeved in the piston barrel 11, and its bottom is inserted and confined in the piston seat 9; the plastic spring 3 is sleeved outside the piston barrel 11 and is compressed in the cylinder 5.

[0023] The above-mentioned insertions all adopt interference fit. When assembling the foam pump, first insert the piston seat 9 on the top of the liquid inlet cylinder 8. Except for the inserted part, the upper part of the piston seat 9 is located in the cylinder 5. The piston rod 10 is sleeved in the piston tube 11 and its bottom is sleeved on the piston seat 9. Then the plastic spring 3 is sleeved outside the piston tube 11, and then the annular seat 6 and the annular piston 7 are fixed. Then the top of the piston tube 11 is inserted into the annular seat 6. Finally, the cylinder 5, the outer shell 1 and the pressing head 2 are assembled in sequence. Although the foam pump has many parts, compared with the prior art, the assembly is simpler. At the same time, the plastic spring 3 is used instead of the metal spring, which is convenient for recycling and more environmentally friendly.

[0024] The bottom of the cylinder 5 is provided with a receiving groove 12, in which a spring seat 13 is fixed; the upper outer wall of the piston cylinder 11 is fixed with a fixing seat 14, the bottom of the plastic spring 3 abuts against the spring seat 13, and the top of the plastic spring 3 abuts against the bottom surface of the fixing seat 14. The plastic spring 3 has a certain elasticity, so the top and bottom of the plastic spring 3 can be fixed or not, and it only needs to limit the telescopic position.

[0025] A partition plate 16 is fixed on the spring seat 13, and the partition plate 16 is arranged between the piston cylinder 11 and the plastic spring 3. The bottom of the piston cylinder 11 is limited between the outer wall of the piston seat 9 and the partition plate 16, so that the piston cylinder 11 is guided to a certain extent when it moves up and down to avoid deviation during movement.

[0026] A first annular groove 15 is formed on the upper portion of the fixing seat 14 ; a first downward retaining ring 17 is fixed to the bottom surface of the annular piston 7 , and a second downward retaining ring 18 is fixed to the bottom surface of the annular seat 6 ; the first retaining ring 17 abuts against the inner wall of the first annular groove 15 , and the second retaining ring 18 is squeezed between the first retaining ring 17 and the piston cylinder 11 .

[0027] During assembly, first put the second snap ring 18 into the first snap ring 17, then insert the first snap ring 17 into the first annular groove 15, and then press the annular seat 6 downward so that the second snap ring 18 is gradually inserted between the first snap ring 17 and the piston cylinder 11. Under the pressure of the second snap ring 18, the first snap ring 17 is tightly pressed against the inner wall of the first annular groove 15, so that the annular seat 6, the annular piston 7 and the piston cylinder 11 are assembled together.

[0028] A clamping block 19 is fixed to the bottom of the piston rod 10 , and a limiting block 20 is fixed in the piston seat 9 to resist the clamping block 19 . Under the action of the limiting block 20 , the piston rod 10 will not escape from the piston seat 9 .

[0029] A tapered portion 21 is provided at the top of the piston rod 10 , and the cross section of the outer wall of the tapered portion 21 gradually decreases from top to bottom; a boss 22 is provided inside the piston cylinder 11 , and the cross section of the boss 22 gradually increases from top to bottom, and the tapered portion 21 slides along the boss 22 .

[0030] During assembly, the piston rod 10 is inserted from the top of the piston cylinder 11 , and under the action of external force, the bottom of the piston rod 10 is inserted into the piston seat 9 , and the tapered portion 21 slides along the boss 22 and gradually contacts the boss 22 .

[0031] A third snap ring 23 pointing upward is fixed to the top surface of the annular piston 7. The cross section of the third snap ring 23 is conical, that is, the cross section gradually increases from top to bottom. A second annular groove 24 pointing downward is provided on the bottom surface of the annular seat 6. The third snap ring 23 is clamped into the second annular groove 24. When the third snap ring 23 is clamped into the second annular groove 24 until it can no longer move, a fixed connection is achieved between the annular piston 7 and the annular seat 6.

[0032] A friction net 25 is inserted into the top of the annular seat 6 and fixed in the foam channel 4. The friction net 25 makes the foam denser.

[0033] A limit piece 26 and a blocking ball 27 are provided in the liquid inlet cylinder 8. The limit piece 26 restricts the blocking ball 27 in the liquid inlet cylinder 8. During the pressing process, the pressure in the cylinder 5 gradually changes, and the blocking ball 27 follows the change of air pressure to block or not block the liquid inlet cylinder 8, thereby achieving liquid discharge or no liquid discharge.

[0034] The top surface of the pressing head 2 is provided with anti-skid patterns 28, which can effectively prevent the hand from slipping when pressing.

[0035] The utility model makes assembly easier by adopting a multi-position insertion structure, and makes recycling easier by adopting a plastic spring 3.

[0036] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention shall fall within the protection scope of the present invention.

Claims

1. An external foam pump that is easy to assemble, characterized in that: The invention comprises a housing (1), a pressing head (2), an air pump piston assembly, a liquid pump piston assembly and a plastic spring (3); the pressing head (2) is movable and pressurized on the top of the housing (1); a foam channel (4) is provided in the pressing head (2); the air pump piston assembly comprises a cylinder (5), an annular seat (6) and an annular piston (7); the cylinder (5) is fixed below the housing (1); the top of the annular seat (6) is inserted into the pressing head (2) and communicates with the foam channel (4); the bottom of the annular seat (6) is fixed above the annular piston (7); the annular piston (7) abuts against the inner wall of the cylinder (5); the liquid pump piston The assembly comprises a liquid inlet cylinder (8), a piston seat (9), a piston rod (10) and a piston barrel (11); the liquid inlet cylinder (8) is fixed to the bottom of the cylinder (5) and is an integral structure with the cylinder (5); the bottom of the piston seat (9) is inserted into the top of the liquid inlet cylinder (8); the top of the piston barrel (11) is inserted into the annular seat (6); the bottom is movably sleeved on the piston seat (9); the piston rod (10) is sleeved in the piston barrel (11); the bottom of the piston rod (10) is inserted into and confined in the piston seat (9); the plastic spring (3) is sleeved outside the piston barrel (11) and is compressed in the cylinder (5).

2. The external foam pump that is easy to assemble according to claim 1, characterized in that: The bottom of the cylinder (5) is provided with a receiving groove (12), and a spring seat (13) is fixed in the receiving groove (12); the upper outer wall of the piston cylinder (11) is provided with a fixing seat (14), and the bottom of the plastic spring (3) abuts against the spring seat (13) and the top abuts against the fixing seat (14).

3. The external foam pump that is easy to assemble according to claim 2, characterized in that: A partition plate (16) is provided on the spring seat (13), and the partition plate (16) is provided between the piston cylinder (11) and the plastic spring (3).

4. The external foam pump that is easy to assemble according to claim 1, characterized in that: A fixing seat (14) is provided on the upper outer wall of the piston cylinder (11), and a first annular groove (15) is provided on the upper part of the fixing seat (14); a first downwardly-facing first retaining ring (17) is provided on the bottom surface of the annular piston (7), and a second downwardly-facing second retaining ring (18) is provided on the bottom surface of the annular seat (6); the first retaining ring (17) abuts against the inner wall of the first annular groove (15), and the second retaining ring (18) is squeezed between the first retaining ring (17) and the piston cylinder (11).

5. The external foam pump that is easy to assemble according to claim 1, characterized in that: A clamping block (19) is provided at the bottom of the piston rod (10), and a limiting block (20) is provided in the piston seat (9) for abutting against the clamping block (19).

6. The external foam pump that is easy to assemble according to claim 5, characterized in that: A conical portion (21) is provided at the top of the piston rod (10), and the cross section of the outer wall of the conical portion (21) gradually decreases from top to bottom; a boss (22) is provided inside the piston cylinder (11), and the cross section of the boss (22) gradually increases from top to bottom, and the conical portion (21) slides along the boss (22).

7. The external foam pump that is easy to assemble according to claim 1, characterized in that: The top surface of the annular piston (7) is provided with an upward third retaining ring (23), the cross section of the third retaining ring (23) is conical, and the bottom surface of the annular seat (6) is provided with a downward second annular groove (24), the third retaining ring (23) being clamped into the second annular groove (24).

8. The external foam pump that is easy to assemble according to claim 1, characterized in that: A friction net (25) is inserted into the top of the annular seat (6), and the friction net (25) is arranged in the foam channel (4).

9. The external foam pump that is easy to assemble according to claim 1, characterized in that: A limiting member (26) and a blocking ball (27) are provided in the liquid inlet cylinder (8), and the limiting member (26) limits the blocking ball (27) in the liquid inlet cylinder (8).

10. The external foam pump that is easy to assemble according to claim 1, characterized in that: The top surface of the pressing head (2) is provided with anti-slip grooves (28).

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