Fully plastic single-material pressure pump

Abstract

The full plastic single-material pressure pump includes a pressure head (1), a pump housing (2), a lock cap (3), a lock cover (21), a pump rod (4), a spring (5), a check valve (7), a piston (6), and a liquid introduction pipe (8), all made of the same type of plastic material. The lock cap (3) is inserted and connected to the upper end of the pump housing (2). The pump housing (2) has an upper pump chamber (22) and a lower pump chamber (23). The lock cover (21) is installed between the upper pump chamber (22) and the lower pump chamber (23). The upper end of the pump rod (4) is inserted into and fixed in the pressure head (1), the pump rod (4) passes through the lock cover (21) and extends into the lower pump chamber (23), a spring (5) is installed in the upper pump chamber (22), a suction passage (41) is opened in the pump rod (4), a liquid inlet (42) that communicates the suction passage (41) with the lower pump chamber (23) is installed at the lower end of the pump rod (4), and a piston (6) is located in the lower pump chamber (23) and is fitted onto the outside of the pump rod (4) to move up and down together with the pump rod (4).

Description

[Technical Field]

[0001] The present invention relates to a pressure pump related technical field, and more particularly to a pressure pump made entirely of a single plastic material. [Background technology]

[0002] Pressure pumps have been widely used in daily chemical products, bringing convenience to our lives. Conventional pressure pumps generally use metal springs as the pressure head rebound devices and glass beads as one-way sealing members, so conventional pressure pumps generally contain plastic, metal, and glass components, which require dismantling and further sorting for recycling, which is inconvenient and increases the labor costs of recycling.

[0003] Although the all-plastic pressure pump solves the problem of disassembly and sorting by using all-plastic material components, in actual application, each component of a conventional all-plastic pressure pump generally uses various types of plastics, such as PP, PE, TPE, etc., and different types of plastic materials have different melting points and crystallization properties and are not compatible with each other. In the actual recycling process, the content of different types of plastic materials in the recycled materials is not constant. If they are directly mixed and recycled without sorting, the mechanical properties and appearance properties of the recycled mixed materials will all be significantly reduced. Although there are various sorting methods, the sorting process is time-consuming and costly, and the materials are still always mixed together during the recycling process, so the performance of the mixed and recycled plastic products is much worse than before.

[0004] The present invention was created in response to these circumstances. Summary of the Invention [Problem to be solved by the invention]

[0005] In view of this, one object of the present invention is to provide a pressure pump made entirely from a single plastic material, which does not require disassembly or sorting, is easy to recover, and reduces recovery costs. [Means for solving the problem]

[0006] The technical solution adopted by the present invention to solve the technical problem is as follows:

[0007] The all-plastic single-material pressure pump includes a pressure head, a pump housing, a lock cap, a lock cover, a pump rod, a spring, a check valve, a piston, and a liquid inlet pipe, all of which are made of the same plastic material. The lock cap is inserted and connected to the upper end of the pump housing. The pump housing has an upper pump chamber and a lower pump chamber. The lock cover is installed between the upper pump chamber and the lower pump chamber. The upper end of the pump rod is inserted and fixed to the pressure head. The pump rod passes through the lock cover and extends into the lower pump chamber. The spring is installed in the upper pump chamber. A suction passage is opened in the pump rod. A liquid inlet is installed at the lower end of the pump rod, connecting the suction passage with the lower pump chamber. The piston is located in the lower pump chamber and fitted on the outside of the pump rod to move up and down with the pump rod. The check valve is located at the lower end of the lower pump chamber. The liquid inlet pipe is inserted and connected to the lower end of the pump housing.

[0008] Preferably, the pressing head, pump housing, lock cap, lock cover, pump rod, spring, check valve, piston and liquid introduction pipe are all made of PE or PP material.

[0009] Preferably, a gasket is provided inside the locking cap, and the gasket is made from the same type of plastic material as the locking cap.

[0010] Preferably, a locking structure is provided on the outer wall of the pump housing to limit the vertical movement of the lock cap.

[0011] Preferably, the locking structure includes a fastening groove installed on the pump housing, a locking convex ring, and a fastening ring installed on the lock cap, the upper side of the locking convex ring being provided with a tapered surface that gradually widens from top to bottom, and the inner surface of the fastening ring that approaches the pump housing is a tapered surface that gradually widens from top to bottom.

[0012] Preferably, the pump rod is provided with an upper stopper base and a lower stopper base above and below the liquid inlet, the piston is located between the upper stopper base and the lower stopper base and can move up and down between the upper stopper base and the lower stopper base, the piston is provided with a seal ring that can be fitted with the lower stopper base to achieve a sealed connection, when the lower stopper base is pushed up by the seal ring, it cuts off the communication between the suction passage and the lower pump chamber, and when the pump rod moves down, the lower stopper base disengages from the seal ring and connects the suction passage with the lower pump chamber via the liquid inlet, and the upper stopper base can be pushed by the piston after moving downward a certain distance, pushing the piston downward together.

[0013] Preferably, the piston is provided with an inner sleeve that fits with the pump rod, the seal ring is provided at the lower end of the inner sleeve, the inner sleeve fits with the upper stopper base via its upper end surface and is sealed when the upper stopper base is pressed downward toward the upper end of the inner sleeve, and a convex ring is provided at the upper end of the inner sleeve that protrudes inward and fits with the outer wall of the pump rod in an interference fit.

[0014] Preferably, the spring is injection molded.

[0015] Preferably, the spring has a hollow structure that penetrates vertically and includes an upper cup body, a lower cup body, and a straight cylinder connecting the upper and lower cup bodies, all of which are elastic, and the upper and lower cup bodies are molded symmetrically in the vertical direction into a cup shape, the inner diameters of the upper and lower cup bodies gradually expand from the end approaching the straight cylinder to the other end, and external convex portions are installed at the ends of the upper and lower cup bodies that are away from the straight cylinder.

[0016] Preferably, the spring has a hollow structure penetrating vertically and includes an upper bowl body and a lower bowl body, both of which are elastic, the upper bowl body and the lower bowl body being vertically symmetrical, the upper bowl body being shaped as a bowl with a larger upper end and a smaller lower end, and the lower bowl body being shaped as a bowl with a smaller upper end and a larger lower end, and the lower end of the upper bowl body being joined to the upper end of the lower bowl body.

[0017] Preferably, the spring is an elastic plastic annular member having openings on its side, and a reinforcing rib on the outer surface of the elastic plastic annular member.

[0018] Preferably, a buckle capable of preventing the pressure head from being pushed downward is removably connected between the lock cap and the pressure head on the pump rod, and the buckle is made of the same type of plastic material as the lock cap. [Effects of the Invention]

[0019] Compared with the prior art, the beneficial effects of the present invention are as follows: all components of the present invention are made of a single type of plastic material, so there is no need to disassemble or separate the pump after recycling, and there is no need to sort out different plastic materials. The liquid plastic can be directly melted and injected into other products, reducing the difficulty and cost of recycling. [Brief explanation of the drawings]

[0020] [Figure 1] 1 is a schematic diagram of the overall structure of the present invention; [Figure 2] 1 is a cross-sectional view of the present invention. [Figure 3] FIG. 1 is an exploded view of the present invention. [Figure 4] FIG. 3 is an enlarged schematic view of part A in FIG. 2. [Figure 5] FIG. 2 is a structural schematic diagram of a pump rod. [Figure 6] FIG. 3 is an enlarged schematic view of part B in FIG. 2. [Figure 7] FIG. 2 is a structural schematic diagram of a first embodiment of the spring; [Figure 8] FIG. 10 is a structural schematic diagram of a second embodiment of the spring; [Figure 9] FIG. 10 is a structural schematic diagram of a third embodiment of the spring; [Figure 10] FIG. 4 is a cross-sectional view of a second embodiment of the present invention. DETAILED DESCRIPTION OF THE INVENTION

[0021] The following will more clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the drawings.

[0022] 1 to 4, the pressure pump made of a single plastic material according to the present invention includes a pressure head 1, a pump housing 2, a lock cap 3, a lock cover 21, a pump rod 4, a spring 5, a check valve 7, a piston 6, and a liquid introduction pipe 8, all of which are made of the same plastic material. The lock cap 3 is inserted and connected to the upper end of the pump housing 2, the pump housing 2 having an upper pump chamber 22 and a lower pump chamber 23, the lock cover 21 being disposed between the upper pump chamber 22 and the lower pump chamber 23, and the upper end of the pump rod 4 is connected to the pressure head 1, a pump housing 2, a lock cap 3, a lock cover 21, a pump rod 4, a spring 5, a check valve 7, a piston 6, and a liquid introduction pipe 8. The pump rod 4 passes through the lock cover 21 and extends into the lower pump chamber 23. The spring 5 is installed in the upper pump chamber 22. The pump rod 4 has a suction passage 41 formed therein. The lower end of the pump rod 4 has a liquid inlet 42 connecting the suction passage 41 with the lower pump chamber 23. The piston 6 is located in the lower pump chamber 23 and fitted onto the outside of the pump rod 4, moving up and down along with the pump rod 4. The check valve 7 is located at the lower end of the lower pump chamber 23. The liquid inlet pipe 8 is inserted into and connected to the lower end of the pump housing 2.

[0023] This all-plastic single-material pressure pump has components all made of the same plastic material, so there is no need to disassemble or separate the pump after recycling, and there is no need to select different plastic materials; the liquid plastic can be directly melted and injected into other products for reuse, reducing the difficulty and cost of recycling. At the same time, it avoids the problems of metal springs being easily corroded and contaminating the contents when using metal springs.

[0024] In this embodiment, the pressing head 1, pump housing 2, lock cap 3, lock cover 21, pump rod 4, spring 5, check valve 7, piston 6, and liquid introduction pipe 8 are all made of PE or PP material, which is environmentally friendly and safe.

[0025] In this embodiment, a gasket 31 is installed inside the lock cap 3, and the gasket 31 is made of the same plastic material as the lock cap 3. The gasket 31 can ensure better sealing when the lock cap 3 is connected to the bottle body, which is a daily chemical product.

[0026] As shown in Figures 2 to 4, a locking structure is provided on the outer wall of the pump housing 2 to limit the vertical movement of the lock cap 3, preventing the pump housing 2 and the lock cap 3 from loosening and falling off, thereby improving the stability of the connection.

[0027] 2 to 4, the locking structure includes a locking groove 25 installed on pump housing 2, a locking protrusion ring 24, and a locking ring 32 installed on locking cap 3. The upper side of locking protrusion ring 24 has a tapered surface that gradually widens from top to bottom, and the inner surface of locking ring 32 that approaches pump housing 2 also has a tapered surface that gradually widens from top to bottom. The assembly process between locking cap 3 and pump housing 2 is simple and convenient, as it involves simply fitting locking cap 3 onto pump housing 2 from top to bottom and inserting locking ring 32 into locking groove 25. After assembly is complete, locking protrusion ring 24 can restrict the up and down movement of locking cap 3, making the structure simple, convenient, and reliable. As the clamping ring 32 is inserted into the clamping groove 25 from top to bottom, the inner surface of the clamping ring 32 that faces the pump housing 2 comes into contact with the upper tapered surface of the locking ring 24, pressing the clamping ring 32 so that it can be smoothly inserted downward into the clamping groove 25. This prevents any significant delay in the process of inserting the clamping ring 32 into the locking ring 24, making the assembly of the locking cap 3 and the pump housing 2 easier and smoother.

[0028] As shown in Figures 2, 5 and 6, an upper stopper base 43 and a lower stopper base 44 are respectively provided above and below the liquid inlet 42 of the pump rod 4. The piston 6 is located between the upper stopper base 43 and the lower stopper base 44 and can move up and down between the upper stopper base 43 and the lower stopper base 44. The piston 6 is provided with a seal ring 61 that can be fitted with the lower stopper base 44 to achieve a sealed connection. When the pump rod 4 pops up and the lower stopper base 44 is pushed up by the seal ring 61, the communication between the suction passage 41 and the lower pump chamber 23 is cut off. When the pump rod 4 moves downward after pressing the pressing head 1 downward, the lower stopper base 44 moves downward to seal the lower stopper base 44. The upper stopper base 43 then disengages from the sealing ring 61, connecting the suction passage 41 to the lower pump chamber 23 via the liquid inlet 42. After moving downward a certain distance, the upper stopper base 43 is pressed by the piston 6, forcing the piston 6 to move downward together, causing the liquid in the lower pump chamber 23 to be pumped out through the suction passage 41. After the pressed pump head 1 is released, the elastic action of the spring 5 causes the pump rod 4 to pop up and press against the bottom of the sealing ring 61 via the lower stopper base 44, pulling the piston 6 upward. This creates negative pressure within the lower pump chamber 23, opening the check valve 7, and allowing the liquid in the bottle to flow into the lower pump chamber 23 via the liquid inlet pipe 8. The piston 6 movement structure, consisting of the pump rod 4 and piston 6, is simple, has few components, and is easy to assemble.

[0029] As shown in FIG. 6 , the piston 6 is provided with an inner sleeve 62 that fits onto the pump rod 4, and a seal ring 61 is provided at the lower end of the inner sleeve 62. The inner sleeve 62 fits onto the upper stopper base 43 via its upper end surface and is sealed when the upper stopper base 43 is pressed downward by the upper end of the inner sleeve 62. A convex ring 63 is provided at the upper end of the inner sleeve 62, protruding inward and fitting into the outer wall of the pump rod 4 with interference. The middle and lower parts of the pump rod 4 have a stepped shaft structure with a larger top and a smaller bottom, and the outer diameter of the pump rod 4 corresponding to the upper stopper base 43 is larger than that of the lower stopper base 44. The inner hole of the inner sleeve 62 is larger at the top and smaller at the bottom, allowing the lower stopper base 44 to pass from top to bottom, restricting the upper stopper base 43 from passing through. The seal ring 61 protrudes from the lower end opening of the inner sleeve 62 and allows the lower stopper base 44 to pass from top to bottom under the action of external force, resulting in a simple structure and easy assembly.

[0030] In this embodiment, the spring 5 is integrally injection molded, which is easy to produce and has high molding accuracy.

[0031] As shown in Figure 7, in a first embodiment of the spring 5, the spring 5 has a hollow structure that penetrates vertically and includes an upper cup body 51, a lower cup body 52, and a straight cylindrical body 53 that connects the upper cup body 51 and the lower cup body 52, all of which are elastic. The upper cup body 51 and the lower cup body 52 are molded symmetrically in the vertical direction and have a cup shape. The inner diameters of the upper cup body 51 and the lower cup body 52 gradually expand from the end approaching the straight cylindrical body 53 to the other end, and outer convex portions 54 are provided at the ends of the upper cup body 51 and the lower cup body 52 that are away from the straight cylindrical body 53, resulting in a simple structure and good elasticity.

[0032] As shown in FIG. 8, in a second embodiment of spring 5, spring 5 has a hollow structure penetrating vertically and includes upper bowl body 55 and lower bowl body 56, both of which are elastic. Upper bowl body 55 and lower bowl body 56 are vertically symmetrical. Upper bowl body 55 is molded as a bowl-shaped structure with a larger upper end and a smaller lower end, while lower bowl body 56 is molded as a bowl-shaped structure with a smaller upper end and a larger lower end, and the lower end of upper bowl body 55 is joined to the upper end of lower bowl body 56, resulting in a simple structure and excellent elasticity.

[0033] As shown in FIG. 9, the third embodiment of the spring 5 is an elastic plastic ring member with an opening on the side, which has a simple structure and good elasticity. Reinforcing ribs 57 are provided on the outer surface of the elastic plastic ring member to reinforce the strength of the elastic plastic ring member.

[0034] As shown in Figures 1 to 3, a buckle 9 is detachably connected between the locking cap 3 and the pressing head 1 on the pump rod 4, which can prevent the pressing head 1 from being pressed downward. The buckle 9 is made of the same type of plastic material as the locking cap 3, and can prevent a user from accidentally pressing the pressing head 1 and causing liquid leakage.

[0035] As shown in FIG. 10, in the second embodiment of the present invention, the check valve 7 is a pump bead, which is made of the same kind of plastic material as the lock cap 3 and has a simple structure.

[0036] The above is merely a preferred embodiment of the present invention, and any technical solutions that achieve the object of the present invention by basically the same means are within the protection scope of the present invention.

Claims

1. A pressure pump made entirely of a single plastic material includes a pressure head (1), a pump housing (2), a lock cap (3), a lock cover (21), a pump rod (4), a spring (5), a check valve (7), a piston (6), and a liquid introduction pipe (8), all made of the same plastic material. The lock cap (3) is inserted into and connected to the upper end of the pump housing (2). The pump housing (2) has an upper pump chamber (22) and a lower pump chamber (23). The lock cover (21) is installed between the upper pump chamber (22) and the lower pump chamber (23). The upper end of the pump rod (4) is inserted into and fixed to the pressure head (1). The pump rod (4) passes through the lock cover (21) and extends into the lower pump chamber (23), the spring (5) is installed in the upper pump chamber (22), a suction passage (41) is opened in the pump rod (4), a liquid inlet (42) is installed at the lower end of the pump rod (4) to communicate the suction passage (41) with the lower pump chamber (23), the piston (6) is located in the lower pump chamber (23) and fitted on the outside of the pump rod (4) to move up and down along with the pump rod (4), the check valve (7) is located at the lower end of the lower pump chamber (23), and the liquid introduction pipe (8) is inserted into and connected to the lower end of the pump housing (2), The spring (5) is fitted onto the outer periphery of the pump rod (4), One axial end of the spring (5) is in contact with the pressing head (1), and the other axial end is in contact with the lock cover (21). The spring (5) is an elastic plastic annular member having an opening on its side, and a first portion is formed at the edge of the opening, protruding in the radial direction of the spring (5) and extending in the axial direction of the spring (5); A reinforcing rib (57) is provided on the outer surface of the elastic plastic annular member, The reinforcing rib (57) includes a second portion extending along the axial direction of the spring (5), and two third portions connected to the second portion at the center of the axial direction of the spring (5), located on both sides of the second portion, and extending along the circumferential direction of the spring (5) relative to the second portion.

2. 2. The pressure pump made entirely of a single plastic material as claimed in claim 1, wherein the pressure head (1), pump housing (2), lock cap (3), lock cover (21), pump rod (4), spring (5), check valve (7), piston (6), and liquid introduction pipe (8) are all made of PE or PP material.

3. 2. The pressure pump made entirely of a single plastic material as claimed in claim 1, characterized in that a gasket (31) is installed inside the lock cap (3), and the gasket (31) is made of the same type of plastic material as the lock cap (3).

4. 2. The pressure pump made entirely of a single plastic material according to claim 1, wherein a locking structure is provided on the outer wall of the pump housing (2) to limit the vertical movement of the lock cap (3).

5. 5. The pressure pump made entirely of a single plastic material as claimed in claim 4, wherein the locking structure includes a locking groove (25) installed on the pump housing (2), a locking protrusion ring (24), and a locking ring (32) installed on the lock cap (3), wherein the upper side of the locking protrusion ring (24) has a tapered surface that gradually widens from top to bottom, and the inner surface of the locking ring (32) that approaches the pump housing (2) has a tapered surface that gradually widens from top to bottom.

6. An upper stopper base (43) and a lower stopper base (44) are respectively provided above and below the liquid inlet (42) on the pump rod (4), the piston (6) is located between the upper stopper base (43) and the lower stopper base (44) and can move up and down between the upper stopper base (43) and the lower stopper base (44), the piston (6) is provided with a seal ring (61) that can be fitted with the lower stopper base (44) to achieve a sealed connection, and when the lower stopper base (44) is pushed upward toward the seal ring (61), 2. The pressure pump made of a single plastic material as claimed in claim 1, wherein when the pump rod (4) moves downward, the communication between the suction passage (41) and the lower pump chamber (23) is cut off, and when the pump rod (4) moves downward, the lower stopper base (44) moves downward away from the seal ring (61), and the suction passage (41) communicates with the lower pump chamber (23) through the liquid inlet (42), and the upper stopper base (43) moves downward a certain distance and is then pushed by the piston (6) to push the piston (6) downward together.

7. 7. The pressure pump made entirely of a single plastic material as claimed in claim 6, characterized in that the piston (6) is provided with an inner sleeve (62) that fits around the pump rod (4), the seal ring (61) is provided at the lower end of the inner sleeve (62), the inner sleeve (62) fits with the upper stopper base (43) via its upper end surface and is sealed when the upper stopper base (43) is pressed downward toward the upper end of the inner sleeve (62), and the upper end of the inner sleeve (62) is provided with a convex ring (63) that protrudes inward and fits with the outer wall of the pump rod (4) in an interference fit.

8. 2. The pressure pump made of a single material of plastic as claimed in claim 1, characterized in that the spring (5) is integrally injection molded.

9. 2. The pressure pump made entirely of a single plastic material as claimed in claim 1, characterized in that a buckle (9) capable of preventing the pressure head (1) from being pushed downward is removably connected between the lock cap (3) and the pressure head (1) in the axial direction of the pump rod (4), and the buckle (9) is made of the same type of plastic material as the lock cap (3).

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