A pressure pump made entirely from a single plastic material

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 technical field related to pressure pumps, 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, and bring convenience to our lives. Conventional pressure pumps generally use metal springs as the rebounding devices of pressure heads and glass beads as the one-way sealing members, so that conventional pressure pumps generally contain plastic, metal and glass components, and need to be disassembled and then classified for recycling when they are recycled, which is inconvenient and increases the labor costs of recycling.

[0003] The full plastic pressure pump has solved the problem of dismantling and sorting by adopting parts made of full plastic materials, but in actual application, each part of the traditional full 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 performance, 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 be greatly reduced. Although there are various sorting methods, the sorting process is time-consuming and costly, and they are still always mixed with each other during the recycling process, and 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 of the objects of the present invention is to provide a pressure pump made entirely from a single plastic material, which does not require dismantling or sorting, is easy to recover, and reduces recovery costs. [Means for solving the problem]

[0006] The technical solutions adopted by the present invention to solve the technical problems are as follows:

[0007] The full 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 introduction pipe, which are all made of the same kind of plastic material, the lock cap being inserted and connected to the upper end of the pump housing, the pump housing having an upper pump chamber and a lower pump chamber, the lock cover being installed between the upper pump chamber and the lower pump chamber, the upper end of the pump rod being inserted and fixed to the pressure head, the pump rod passing through the lock cover and extending into the lower pump chamber, the spring being installed in the upper pump chamber, a suction passage being opened in the pump rod, and a liquid inlet communicating the suction passage and the lower pump chamber being installed at the lower end of the pump rod, the piston being 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 being located at the lower end of the lower pump chamber, and the liquid introduction pipe being 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 tube are all made of PE or PP material.

[0009] Preferably, a gasket is provided inside the locking cap, the gasket being manufactured from the same plastic material as the locking cap.

[0010] Preferably, a locking structure is provided on an 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 is provided with a tapered surface gradually expanding from top to bottom, and the inner surface of the fastening ring approaching the pump housing is a tapered surface gradually expanding from top to bottom.

[0012] Preferably, an upper stopper base and a lower stopper base are provided above and below the liquid inlet on the pump rod, 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 realize a sealed connection, when the lower stopper base is pushed upward by the seal ring, it cuts off the communication between the suction passage and the lower pump chamber, when the pump rod moves downward, the lower stopper base detaches from the seal ring downward and connects the suction passage to the lower pump chamber through the liquid inlet, and the upper stopper base can be pushed by the piston after moving downward a certain distance, pushing the piston to move downward together.

[0013] Preferably, the piston is provided with an inner sleeve that engages with the pump rod, the seal ring is provided at the lower end of the inner sleeve, the inner sleeve engages with the upper stopper base via its upper end surface and is sealed when the upper stopper base is pressed downward to 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 interferes with the outer wall of the pump rod.

[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 cup body and the lower cup body, all of which are elastic, the upper cup body and the lower cup body being molded into a cup shape that is symmetrical vertically, the inner diameters of the upper cup body and the lower cup body gradually expand from the end approaching the straight cylinder to the other end, and external convex portions are provided at the ends of the upper cup body and the lower cup body 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 have elasticity, the upper bowl body and the lower bowl body being vertically symmetrical, the upper bowl body being molded as a bowl-shaped structure having a large upper end and a small lower end, the lower bowl body being molded as a bowl-shaped structure having a small upper end and a large 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 a resilient plastic ring having an opening on its side and a reinforcing rib on the outer surface of the resilient plastic ring.

[0018] Preferably, a buckle capable of preventing the press head from being pressed downward is removably connected between the lock cap and the press head on the pump rod, and the buckle is manufactured from the same type of plastic material as the lock cap. Effect 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, and the pump does not need to be disassembled or separated after being recycled, and does not need to be sorted into different plastic materials. The liquid plastic can be directly melted and re-injected into other products for reuse, which reduces the difficulty and cost of recycling. [Brief description of the drawings]

[0020] [Figure 1] FIG. 1 is a schematic diagram of the overall structure of the present invention. [Diagram 2] FIG. 2 is a cross-sectional view of the present invention. [Diagram 3] FIG. 2 is an exploded view of the present invention. [Figure 4] FIG. 3 is an enlarged schematic view of part A in FIG. 2. [Diagram 5] FIG. 2 is a schematic diagram of the structure of a pump rod. [Figure 6] FIG. 3 is an enlarged schematic view of part B in FIG. [Figure 7] FIG. 2 is a structural schematic diagram of a first embodiment of a spring. [Figure 8] FIG. 4 is a structural schematic diagram of a second embodiment of the spring; [Figure 9] FIG. 11 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 PREFERRED EMBODIMENTS

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

[0022] 1 to 4, the full plastic single-material pressure pump 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, which are all made of the same kind 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, and the upper end of the pump rod 4 is connected to the pressure head 1, which is made of the same kind of plastic material. 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 that connects the suction passage 41 and the lower pump chamber 23 is installed at the lower end of the pump rod 4. The 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. The check valve 7 is located at the lower end of the lower pump chamber 23. The liquid introduction 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 made of the same type of plastic material, so it does not need to be disassembled or separated after recycling, and does not need to select different plastic materials, and can be directly melted into liquid plastic 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 the contents being polluted when metal springs are used.

[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, so that the gasket 31 can achieve 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, which prevents the pump housing 2 and the lock cap 3 from loosening and falling off, improving the stability of the connection.

[0027] 2 to 4, the locking structure includes a fastening groove 25 installed on the pump housing 2, a locking protruding ring 24, and a fastening ring 32 installed on the locking cap 3, the upper side of the locking protruding ring 24 is provided with a tapered surface gradually expanding from top to bottom, and the inner surface of the fastening ring 32 approaching the pump housing 2 is a tapered surface gradually expanding from top to bottom. In the process of assembling the locking cap 3 and the pump housing 2, the assembly work can be completed by fitting the locking cap 3 onto the pump housing 2 from top to bottom and inserting the fastening ring 32 into the fastening groove 25, which is simple and convenient, and after the assembly is completed, the locking protruding ring 24 can limit the up and down movement of the locking cap 3, which is simple in structure, convenient and reliable. When the fastening ring 32 is inserted into the fastening groove 25 from top to bottom, the inner surface of the fastening ring 32 approaching the pump housing 2 comes into contact with the upper tapered surface of the locking convex ring 24, pressing the fastening ring 32 so that it can be smoothly inserted downward into the fastening groove 25, so that there is no significant delay in the process of the fastening ring 32 being inserted into the locking convex ring 24, making the assembly work of the locking cap 3 and the pump housing 2 easier and smoother.

[0028] As shown in FIG. 2, FIG. 5 and FIG. 6, the pump rod 4 is provided with an upper stopper base 43 and a lower stopper base 44 above and below the liquid inlet 42, respectively. 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 realize 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 the pressing head 1 is pressed downward, the lower stopper base 44 is pressed downward to seal the lower stopper base 44. The upper stopper base 43 is detached from the sealing ring 61, and the suction passage 41 is connected to the lower pump chamber 23 through the liquid inlet 42, and the upper stopper base 43 is pushed by the piston 6 after moving downward a certain distance, and the piston 6 is pushed downward together, so that the liquid in the lower pump chamber 23 begins to be pumped out through the suction passage 41, and after the pressed pressing head 1 is released, the pump rod 4 pops up and moves upward due to the elastic action of the spring 5, and presses the bottom of the sealing ring 61 through the lower stopper base 44 to pull the piston 6 upward, so that negative pressure is generated inside the lower pump chamber 23, the check valve 7 opens, and the liquid in the bottle flows into the lower pump chamber 23 through the liquid introduction pipe 8. The piston 6 movement structure consisting of the pump rod 4 and the 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 with 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 with 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 step-shaft structure which is larger at the top and smaller at the bottom, and the outer diameter of the pump rod 4 corresponding to the upper stopper base 43 is larger than the outer diameter of the pump rod 4 corresponding to the lower stopper base 44. The inner hole of the inner sleeve 62 is larger at the top and smaller at the bottom, and is intended to allow the lower stopper base 44 to pass from top to bottom to restrict 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, so the structure is simple and the assembly is easy.

[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 FIG. 7, as a first embodiment of the spring 5, the spring 5 has a hollow structure penetrating vertically, and includes an upper cup body 51, a lower cup body 52, and a straight cylinder body 53 connecting the upper cup body 51 and the lower cup body 52, all of which have elasticity. The upper cup body 51 and the lower cup body 52 are formed into a cup shape that is symmetrical vertically, the inner diameters of the upper cup body 51 and the lower cup body 52 gradually expand from the end approaching the straight cylinder 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 away from the straight cylinder body 53, thereby providing 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 have elasticity, and upper bowl body 55 and lower bowl body 56 are vertically symmetrical, upper bowl body 55 is molded as a bowl-shaped structure which is large at the top and small at the bottom, and lower bowl body 56 is molded as a bowl-shaped structure which is small at the top and large at the bottom, and the bottom end of upper bowl body 55 is joined to the top end of lower bowl body 56, resulting in a simple structure and good elasticity.

[0033] As shown in FIG. 9, as a third embodiment of the spring 5, the spring 5 is an elastic plastic ring member with an opening on the side, which has a simple structure and good elasticity. A reinforcing rib 57 is 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 removably connected between the lock cap 3 and the press head 1 on the pump rod 4, which can prevent the press head 1 from being pressed downward. The buckle 9 is made of the same plastic material as the lock cap 3, and can prevent the user from accidentally pressing the press 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 essentially the same means are within the protection scope of the present invention.

Claims

1. A pressure pump made 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 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 and fixed to the pressure head (1). The pump rod (4) is , passing through the lock cover (21) and extending 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) communicating the suction passage (41) with the lower pump chamber (23) is installed at the lower end of the pump rod (4), the piston (6) is located in the lower pump chamber (23) and fitted onto the outside of the pump rod (4) to move up and down together 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).

2. The full plastic single-material pressure pump according to claim 1, characterized in that 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. The pressure pump made of a single material made of full plastic as described in claim 1, characterized in that a gasket (31) is installed inside the lock cap (3), and the gasket (31) is manufactured from the same type of plastic material as the lock cap (3).

4. 2. The pressure pump made of a single plastic material as claimed in claim 1, characterized in that a locking structure is provided on an outer wall of the pump housing (2) to limit the vertical movement of the lock cap (3).

5. The pressure pump made entirely of a single plastic material as described in claim 4, characterized in that the locking structure includes a fastening groove (25) installed on the pump housing (2), a locking protruding ring (24), and a fastening ring (32) installed on the lock cap (3), the upper side of the locking protruding ring (24) is provided with a tapered surface gradually expanding from top to bottom, and the inner surface of the fastening ring (32) approaching the pump housing (2) is a tapered surface gradually expanding 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) in 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 into the lower stopper base (44) to realize a sealed connection, and when the lower stopper base (44) is pushed up by the seal ring (61), the piston (6) moves forward.

2. The pressure pump made of a single plastic material as claimed in claim 1, characterized in that when the communication between the suction passage (41) and the lower pump chamber (23) is cut off and the pump rod (4) moves downward, the lower stopper base (44) is detached from the seal ring (61) downward, and the suction passage (41) is communicated with the lower pump chamber (23) through the liquid inlet (42), and the upper stopper base (43) can be pushed by the piston (6) after moving downward a certain distance, and can push the piston (6) to move downward together.

7. 7. The pressure pump made 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 with 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 to the upper end of the inner sleeve (62), and a convex ring (63) that protrudes inward and is provided at the upper end of the inner sleeve (62) and fits with the outer wall of the pump rod (4) in an interference fit.

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

9. The pressure pump made entirely of a single plastic material as described in claim 8, characterized in that the spring (5) has a hollow structure penetrating vertically, and includes an upper cup body (51), a lower cup body (52), and a straight cylinder (53) connecting the upper cup body (51) and the lower cup body (52), all of which have elasticity, the upper cup body (51) and the lower cup body (52) being molded vertically symmetrically into a cup shape, the inner diameters of the upper cup body (51) and the lower cup body (52) gradually expanding from the end approaching the straight cylinder (53) to the other end, and an outer convex portion (54) is provided at the end of the upper cup body (51) and the lower cup body (52) away from the straight cylinder (53).

10. 9. The pressure pump made entirely of a single plastic material as claimed in claim 8, characterized in that the spring (5) has a hollow structure penetrating vertically, and includes an upper bowl body (55) and a lower bowl body (56), both of which have elasticity, the upper bowl body (55) and the lower bowl body (56) being vertically symmetrical, the upper bowl body (55) being molded as a bowl-shaped structure having a large upper end and a small lower end, the lower bowl body (56) being molded as a bowl-shaped structure having a small upper end and a large lower end, and the lower end of the upper bowl body (55) and the upper end of the lower bowl body (56) being joined to each other.

11. The pressure pump made of a single material made of all plastic as described in claim 8, characterized in that the spring (5) is an elastic plastic annular member having an opening on its side, and a reinforcing rib (57) is provided on the outer surface of the elastic plastic annular member.

12. The full plastic single-material pressure pump as described in claim 1, characterized in that a buckle (9) capable of preventing the pressure head (1) from being pressed downward is removably connected between the lock cap (3) and the pressure head (1) on the pump rod (4), and the buckle (9) is manufactured from the same type of plastic material as the lock cap (3).

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