All-plastic foam pump with external spring

Abstract

The utility model discloses an external spring all-plastic foam pump which comprises a shell, a pressing piece arranged on the top of the shell and a pump body, the pump body comprises an air cylinder, a liquid inlet barrel, a plastic spring, an air pump piston assembly and a liquid pump piston assembly, the air cylinder is fixedly connected with the shell, and the liquid inlet barrel is fixedly connected to the bottom of the air cylinder. The air pump piston assembly is arranged in the air cylinder and moves along with the pressing piece, the liquid pump piston assembly moves along with the air pump piston assembly, the plastic spring is arranged outside the liquid pump piston assembly, liquid flows into the liquid pump piston assembly and does not make direct contact with the plastic spring, and the problems that the plastic spring is corroded and the like are solved. Meanwhile, the plastic spring adopts a mode that the elastic units are connected through the connecting seats, compression of the elastic units is supported through the connecting seats, and the service life of the plastic spring is prolonged.

Description

Technical Field

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

[0002] Chinese patent CN220663455U discloses an all-plastic foam pump. Although its spring is made of plastic material, its plastic spring contacts liquid during use and there is a risk of corrosion by liquid. In addition, Chinese patent CN220683350U discloses an external spring foam pump. Its internal spring is placed outside the liquid pump chamber. Although it does not contact liquid and has a longer service life, its spring is made of metal material. When recycling the foam pump, the metal spring needs to be disassembled separately and then recycled separately from the plastic shell. Due to the unique structure of the foam pump, it is troublesome to disassemble the metal spring, and the recycling of the foam pump is relatively difficult. Utility Model Content

[0003] In view of the defects of the above-mentioned prior art, the purpose of the utility model is to provide an all-plastic foam pump with an external spring, which solves the problem that the external spring foam pump is difficult to recycle and has a longer service life.

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

[0005] An external spring all-plastic foam pump comprises a shell, a pressing piece arranged on the top of the shell and a pump body, wherein the pump body comprises a cylinder, a liquid inlet cylinder, a plastic spring, an air pump piston assembly and a liquid pump piston assembly, wherein the cylinder is fixedly connected to the shell, the liquid inlet cylinder is fixedly connected to the bottom of the cylinder, the air pump piston assembly is in the cylinder and moves with the pressing piece, and the liquid pump piston assembly moves with the air pump piston assembly;

[0006] A through hole is provided in the middle of the plastic spring, and the plastic spring is sleeved on the liquid pump piston assembly through the through hole. The plastic spring is telescopic between the air pump piston assembly and the bottom of the cylinder, and includes a plurality of connecting seats and an elastic unit fixed between adjacent connecting seats.

[0007] Furthermore, the elastic unit includes a first compression plate, a second compression plate and a connecting plate, the first compression plate is in a “>” shape, the second compression plate is in a “<” shape, the first compression plate and the second compression plate are arranged in mirror symmetry, the connecting plate fixedly connects the first compression plate and the second compression plate, and the first compression plate, the second compression plate and the connecting plate are in an “X” shape after being connected.

[0008] Furthermore, the topmost connecting seat is fixed on the air pump piston assembly, the bottom of the cylinder is provided with a spring seat, and the bottommost connecting seat is fixed on the spring seat.

[0009] Furthermore, the first compression plate and the second compression plate each include a compression plate A and a compression plate B, and the compression plate A and the compression plate B are fixedly connected and arranged in a mirror-symmetrical manner along the connection position; a hollow structure is opened in the middle of the first compression plate and the second compression plate, and the hollow structure is arranged in a mirror-symmetrical manner along the connection position of the compression plate A and the compression plate B.

[0010] Furthermore, in the same elastic unit, the connection position of the compression plate A and the compression plate B on the first compression plate is recorded as position A, the connection position of the compression plate A and the compression plate B on the second compression plate is recorded as position B, and the connecting plate fixes the connection between position A and position B.

[0011] Furthermore, a foam channel is provided in the pressing member, and the foam channel is connected to the liquid pump piston assembly and the liquid inlet cylinder.

[0012] Furthermore, the air pump piston assembly includes an annular seat and an annular piston, the annular piston moves with the pressing piece, the annular seat is arranged in the annular piston and rests against the top of the plastic spring, the annular piston and the cylinder cavity form an air pump chamber, and the annular piston is provided with a vent hole.

[0013] Furthermore, the liquid pump piston assembly includes a piston seat and a piston rod sleeved in the piston seat, the piston seat is arranged below the air pump piston assembly, and the plastic spring is sleeved outside the piston seat.

[0014] Furthermore, a glass ball and a limit block are provided in the liquid inlet cylinder, and the limit block is used to limit the glass ball from escaping from the liquid inlet cylinder.

[0015] Furthermore, a friction net is fixed on the upper part of the air pump piston assembly.

[0016] The beneficial effects of the utility model are:

[0017] 1. The plastic spring is placed outside the liquid pump piston assembly. The liquid flows into the liquid pump piston assembly without directly contacting the plastic spring, which will not cause corrosion to the plastic spring. At the same time, the plastic spring adopts a method of connecting the elastic unit with multiple connecting seats, and the connecting seats are used to support the compression of the elastic unit, thereby increasing the support of the plastic spring and prolonging the service life of the plastic spring.

[0018] 2. A plastic spring is used instead of a metal spring. The plastic spring has good elasticity and stability. At the same time, the plastic spring is made of the same plastic material as the foam pump, which is convenient for recycling and more environmentally friendly. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1This is a schematic diagram of the structure of the external spring all-plastic foam pump of the utility model;

[0020] Figure 2 This is the front view of the external spring all-plastic foam pump of the utility model;

[0021] Figure 3 It is a cross-sectional view of the external spring all-plastic foam pump of the utility model;

[0022] Figure 4 It is a structural schematic diagram of the plastic spring in the utility model;

[0023] Figure 5 This is the front view of the plastic spring in the utility model;

[0024] Figure 6 It is a front view of the elastic unit in the utility model;

[0025] Figure 7 It is a side view of the plastic spring in the utility model;

[0026] Figure 8 It is a top view of the plastic spring in the utility model.

[0027] In the figure: 1. shell; 11. internal thread; 2. pressing piece; 21. pressing head; 22. foam channel; 3. pump body; 31. cylinder; 32. liquid inlet cylinder; 33. plastic spring; 331. through hole; 332. connecting seat; 333. elastic unit; 3331. first compression plate; 3332. second compression plate; 3333. connecting plate; 3334. compression plate A; 3335. compression plate B; 3336. hollow structure; 3337. position A; 3338. position B; 34. air pump piston assembly; 341. annular seat; 342. annular piston; 343. air pump chamber; 35. liquid pump piston assembly; 351. piston seat; 352. piston rod; 4. glass ball; 5. limit block; 6. friction net; 7. spring seat. DETAILED DESCRIPTION

[0028] 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.

[0029] Example 1

[0030] like Figure 1-8As shown, this embodiment provides an external spring all-plastic foam pump, including an outer shell 1, a pressing piece 2 arranged on the top of the outer shell 1 and a pump body 3, the pump body 3 includes a cylinder 31, a liquid inlet tube 32, a plastic spring 33, an air pump piston assembly 34 and a liquid pump piston assembly 35, the cylinder 31 and the outer shell 1 are fixedly connected, the liquid inlet tube 32 is fixedly connected to the bottom of the cylinder 31, the air pump piston assembly 34 is in the cylinder 31 and moves with the pressing piece 2, and the liquid pump piston assembly 35 moves with the air pump piston assembly 34.

[0031] A through hole 331 is provided in the middle of the plastic spring 33, and the plastic spring 33 is sleeved on the liquid pump piston assembly 35 through the through hole 331. The plastic spring 33 is retracted between the air pump piston assembly 34 and the bottom of the cylinder 31, and includes multiple connecting seats 332 and elastic units 333 fixed between adjacent connecting seats 332.

[0032] The plastic spring 33 is externally arranged outside the liquid pump piston assembly 35. When liquid flows into the liquid pump piston assembly 35, it will not directly contact the plastic spring 33, and will not cause corrosion and other problems to the plastic spring 33. At the same time, the plastic spring 33 adopts a method of connecting the elastic unit 333 with multiple connecting seats 332, and the connecting seat 332 is used to support the compression of the elastic unit 333, thereby increasing the supporting stability of the plastic spring 33 and increasing the service life of the plastic spring 33.

[0033] Furthermore, the elastic unit 333 includes a first compression plate 3331, a second compression plate 3332 and a connecting plate 3333. The first compression plate 3331 is in the shape of a “>”, the second compression plate 3332 is in the shape of a “<”, the first compression plate 3331 and the second compression plate 3332 are arranged in mirror symmetry, and the connecting plate 3333 fixedly connects the first compression plate 3331 and the second compression plate 3332. The first compression plate 3331, the second compression plate 3332 and the connecting plate 3333 are connected to form an “X” shape.

[0034] The plurality of connection seats 332 and the elastic unit 333 are integrally formed of plastic material, and the plastic spring 33 is an integrally formed structure. Further, the top connection seat 332 is fixed on the air pump piston assembly 34, and the bottom of the cylinder 31 is provided with a spring seat 7, and the bottom connection seat 332 is fixed on the spring seat 7.

[0035] Taking the elastic unit 333 at the top as an example, the elastic unit 333 is in the shape of an "X" in the main viewing direction. The two ends of the top of the "X" are fixed to the top connecting seat 332, and the two ends of the bottom are fixed to the next connecting seat 332. The connecting piece 3333 is located at the intersection of the "X".

[0036] The first compression plate 3331 includes a compression plane A and a compression plane B facing each other, wherein the compression plane B faces the second compression plate 3332. When the plastic spring 33 is compressed, the compression plane A is folded in half and contacts each other. The upper part of the compression plane B contacts the topmost connecting seat 332, and the lower part contacts the next connecting seat 332. Thus, the elasticity and support of the elastic unit 333 have good stability.

[0037] Furthermore, the first compression plate 3331 and the second compression plate 3332 both include a compression plate A3334 and a compression plate B3335, which are fixedly connected and mirror-symmetrically arranged along the connection position, and the first compression plate 3331 and the second compression plate 3332 have the same structure, and the compression plate A3334 and the compression plate B3335 are connected to form a ">" shape or a "<" shape, and the compression plate A3334 and the compression plate B3335 are folded in half when compressed.

[0038] A hollow structure 3336 is provided in the middle of the first compression plate 3331 and the second compression plate 3332. The hollow structure 3336 is arranged mirror-symmetrically along the connection position of the compression plate A 3334 and the compression plate B 3335. The hollow structure 3336 can reduce the amount of raw materials used for the plastic spring 33 and also facilitate the liquid pump piston assembly 35 to pass through the plastic spring 33.

[0039] Furthermore, in the same elastic unit 333, the connection position of the compression plate A3334 and the compression plate B3335 on the first compression plate 3331 is recorded as position A3337, the connection position of the compression plate A3334 and the compression plate B3335 on the second compression plate 3332 is recorded as position B3338, and the connecting plate 3333 fixes the connection between position A3337 and position B3338.

[0040] In the same elastic unit 333, there are two connecting pieces 3333, one connecting piece 3333 is fixedly connected to the same end of the position and the position B3338, and the other connecting piece 3333 is fixedly connected to the position A3337 and the other end of the position B3338. The connecting piece 3333 connects the first compression piece 3331 and the second compression piece 3332 together, and also serves as a compression support point for the first compression piece 3331 and the second compression piece 3332 during compression.

[0041] The plurality of connection seats 332 are all annular, so that the liquid pump piston assembly 35 can pass through the plastic spring 33. There are four elastic units 333, and two adjacent elastic units 333 are arranged in mirror symmetry along the connection seat 332 therebetween.

[0042] Example 2

[0043] like Figure 1-8As shown, this embodiment provides an external spring all-plastic foam pump, which, based on Embodiment 1, also includes the following specific structure.

[0044] The inner wall of the housing 1 is provided with an internal thread 11, and the housing 1 is threadedly connected to a plastic bottle containing liquid. The pressing member 2 comprises a pressing head 21, and a foam channel 22 is provided in the pressing head 21, and the foam channel 22 communicates with a liquid pump piston assembly 35 and a liquid inlet cylinder 32.

[0045] The air pump piston assembly 34 includes an annular seat 341 and an annular piston 342. The annular piston 342 moves with the pressing piece 2. The annular seat 341 is sleeved in the annular piston 342 and rests against the top of the plastic spring 33. The annular piston 342 and the inner cavity of the cylinder 31 form an air pump chamber 343. The annular piston 342 is provided with a vent hole.

[0046] The liquid pump piston assembly 35 includes a piston seat 351 and a piston rod 352 sleeved in the piston seat 351 . The piston seat 351 is arranged below the air pump piston assembly 34 , and the plastic spring 33 is sleeved outside the piston seat 351 .

[0047] Furthermore, a glass ball 4 and a limit block 5 are provided in the liquid inlet cylinder 32 , and the limit block 5 is used to limit the glass ball 4 from escaping from the liquid inlet cylinder 32 .

[0048] Furthermore, a friction net 6 is fixed on the upper part of the air pump piston assembly 34 to make the foam denser.

[0049] Working principle: When the pressing head 21 is pressed, the plastic spring 33 is compressed; when the pressing stops, the plastic spring 33 begins to reset, and the glass ball 4 moves upward under the action of the pressure difference, and the liquid enters the liquid inlet cylinder 32 and the liquid pump piston assembly 35. At the same time, the outside air enters the air pump chamber 343 through the vent, and then enters the top of the liquid pump piston assembly 35 through the gap. The gas and liquid converge above the liquid pump piston assembly 35 to form foam, and finally come out from the foam channel 22.

[0050] The utility model adopts a plastic spring 33 instead of a metal spring. The plastic spring 33 has good elasticity and stability. When used in a foam pump, corrosion and other problems will not occur. At the same time, the plastic spring 33 is made of the same plastic material as the foam pump, which is convenient for recycling and more environmentally friendly.

[0051] 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 spring all-plastic foam pump, characterized in that: The pump body (3) comprises a housing (1), a pressing member (2) arranged at the top of the housing (1), and a pump body (3); the pump body (3) comprises a cylinder (31), a liquid inlet cylinder (32), a plastic spring (33), an air pump piston assembly (34), and a liquid pump piston assembly (35); the cylinder (31) and the housing (1) are fixedly connected; the liquid inlet cylinder (32) is fixedly connected to the bottom of the cylinder (31); the air pump piston assembly (34) is in the cylinder (31) and moves with the pressing member (2); and the liquid pump piston assembly (35) moves with the air pump piston assembly (34); A through hole (331) is provided in the middle of the plastic spring (33); the plastic spring (33) is sleeved on the liquid pump piston assembly (35) through the through hole (331); the plastic spring (33) is telescopic between the air pump piston assembly (34) and the bottom of the cylinder (31), and comprises a plurality of connecting seats (332) and elastic units (333) fixed between adjacent connecting seats (332).

2. The external spring all-plastic foam pump according to claim 1, characterized in that: The elastic unit (333) comprises a first compression plate (3331), a second compression plate (3332) and a connecting plate (3333); the first compression plate (3331) is in a "">" shape, the second compression plate (3332) is in a "<" shape, the first compression plate (3331) and the second compression plate (3332) are arranged in a mirror-symmetrical manner, the connecting plate (3333) is fixedly connected to the first compression plate (3331) and the second compression plate (3332); the first compression plate (3331), the second compression plate (3332) and the connecting plate (3333) are in an "X" shape after being connected.

3. The external spring all-plastic foam pump according to claim 1, characterized in that: The topmost connecting seat (332) is fixed on the air pump piston assembly (34); a spring seat (7) is provided at the bottom of the air cylinder (31); and the bottommost connecting seat (332) is fixed on the spring seat (7).

4. The external spring all-plastic foam pump according to claim 2, characterized in that: The first compression plate (3331) and the second compression plate (3332) both include a compression plate A (3334) and a compression plate B (3335), wherein the compression plate A (3334) and the compression plate B (3335) are fixedly connected and arranged in a mirror-symmetrical manner along the connection position; a hollow structure (3336) is provided in the middle of the first compression plate (3331) and the second compression plate (3332), and the hollow structure (3336) is arranged in a mirror-symmetrical manner along the connection position between the compression plate A (3334) and the compression plate B (3335).

5. The external spring all-plastic foam pump according to claim 4, characterized in that: In the same elastic unit (333), the connection position of the compression plate A (3334) and the compression plate B (3335) on the first compression plate (3331) is recorded as position A (3337), and the connection position of the compression plate A (3334) and the compression plate B (3335) on the second compression plate (3332) is recorded as position B (3338), and the connecting plate (3333) fixes the connection between position A (3337) and position B (3338).

6. The external spring all-plastic foam pump according to claim 1, characterized in that: A foam channel (22) is provided in the pressing member (2), and the foam channel (22) is connected to the liquid pump piston assembly (35) and the liquid inlet cylinder (32).

7. The external spring all-plastic foam pump according to claim 1, characterized in that: The air pump piston assembly (34) comprises an annular seat (341) and an annular piston (342). The annular piston (342) moves with the pressing member (2). The annular seat (341) is sleeved in the annular piston (342) and abuts against the top of the plastic spring (33). The annular piston (342) and the inner cavity of the cylinder (31) form an air pump chamber (343). The annular piston (342) is provided with a vent hole.

8. The external spring all-plastic foam pump according to claim 1, characterized in that: The liquid pump piston assembly (35) comprises a piston seat (351) and a piston rod (352) sleeved in the piston seat (351); the piston seat (351) is arranged below the air pump piston assembly (34); and the plastic spring (33) is sleeved outside the piston seat (351).

9. The external spring all-plastic foam pump according to claim 1, characterized in that: A glass ball (4) and a limit block (5) are arranged in the liquid inlet cylinder (32), and the limit block (5) is used to limit the glass ball (4) from escaping from the liquid inlet cylinder (32).

10. The external spring all-plastic foam pump according to claim 1, characterized in that: A friction net (6) is fixed on the upper part of the air pump piston assembly (34).

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