WO2022165995A1

WO2022165995A1 - All-plastic pressure pump

Info

Publication number: WO2022165995A1
Application number: PCT/CN2021/088725
Authority: WO
Inventors: 李再; 赵秦波
Original assignee: 余姚市丹丹喷雾器有限公司
Priority date: 2021-02-07
Filing date: 2021-04-21
Publication date: 2022-08-11
Also published as: CN112810992A

Abstract

The present application relates to the field of pumps and relates to a full-plastic pressure pump, comprising a base made of a plastic material, the base being provided with a pump cavity, and a liquid inlet and a liquid outlet communicated with the pump cavity, a pressure seat being slidably connected to the base, a piston being connected to the pressure seat; a plastic elastic member being provided between the pressure seat and the base, the plastic elastic member comprising a first mounting portion connected to the pressure seat, a second mounting portion connected to the base, and an elastic portion connecting the first mounting portion and the second mounting portion, the cross-sectional dimensions of the first mounting portion and the second mounting portion being different, the plastic elastic member being integrally formed of a TPE material, and a first one-way structure, a second one-way structure, the pressure seat, and the piston being made of plastic. In present all-plastic pressure pump, metal and glass components in a pressure pump are replaced with plastic components, thereby facilitating secondary recycling; the plastic elastic member made of a TPE material is provided, so that the full-plastic pressure pump has the characteristics of high elasticity, high resilience, and high sealing performance; through sealing of the liquid inlet is achieved by means of a valve needle, so that the full-plastic pressure pump has high sealing performance.

Description

An all-plastic press pump

technical field

The present application relates to the field of pumps, in particular to an all-plastic press pump.

Background technique

The press pump is a manual pump used for pumping liquids, and the liquid is released every time it is pressed. The press pump is mostly used for sprayers, foam pumps, or containers for shampoo and other lotions.

In order to realize the function of pumping liquid, the press pump is equipped with a pump chamber and a piston inside, and a one-way valve is set at the inlet and outlet of the pump chamber. Pumping, the piston is reset by a spring, and the spring is made of metal.

In view of the above-mentioned related technologies, the inventor believes that the pump body of the press pump is made of plastic material, and the plastic components of the press pump are mostly, and the plastic can be melted and recycled after being discarded. However, the metal spring must be separated from the plastic pressing the pump before the plastic can be melted, which has the disadvantage of being difficult to recycle.

SUMMARY OF THE INVENTION

In order to reduce the difficulty of recycling the press pump, the present application provides an all-plastic press pump.

An all-plastic press pump provided by the application adopts the following technical solutions:

An all-plastic pressing pump, comprising a base made of plastic material, a pump cavity, a liquid inlet and a liquid outlet communicating with the pump cavity are arranged inside the all-plastic pressing pump, and the liquid inlet is provided with a first one-way structure, so the The liquid outlet is provided with a second one-way structure. The first one-way structure and the second one-way structure make the liquid flow in one direction along the liquid inlet, the pump cavity and the liquid outlet, and the base is slidably connected with a pressing The pressing seat is connected with a piston, and the piston is slidably connected with the cavity wall of the pump cavity; a plastic elastic member is arranged between the pressing seat and the base, and the plastic elastic member includes a first mounting part connected with the pressing seat , the second installation part connected with the base, the elastic part connecting the first installation part and the second installation part, the cross-sectional dimensions of the first installation part and the second installation part are different, the plastic elastic part is made of TPE material It is integrally formed, and the first one-way structure, the second one-way structure, the pressing seat and the piston are all made of plastic.

By adopting the above technical solution, when the pressing seat is pressed, the piston slides in the pump cavity, and the one-way pumping of the liquid is realized through the action of the first one-way structure and the second one-way structure. Reset provides restoring force. When the plastic elastic member is compressed, the elastic portion mainly produces deformation and generates a restoring force, and the first mounting portion or the second mounting portion can also generate deformation to assist in generating the restoring force. The plastic elastic parts of TPE material have good fatigue resistance, so that the all-plastic pressure pump has the characteristics of high resilience and fatigue resistance. The all-plastic press pump replaces the traditional metal spring with plastic elastic parts, and the rest of the components can be made of plastic. After recycling the press pump, it does not need to be disassembled and separated, and can be directly melted into liquid plastic and re-injected into other products for use, reducing recycling Difficulty of use.

Optionally, the plastic elastic member is a cylindrical structure with open ends and closed side walls.

By adopting the above technical solution, the plastic elastic member with the closed side wall has better waterproof and dustproof capabilities, and the external dust and sewage are not easy to enter into the pressing pump. On the other hand, the plastic elastic parts have more solid parts, so that the plastic elastic parts have higher resilience and explosive force.

Optionally, the pressing seat is fixedly connected with a valve stem made of plastic material, the first one-way structure includes a valve needle, the valve needle is arranged at the end of the valve stem facing the liquid inlet, and the valve needle can pass through the valve. Slide to close or open the fluid inlet.

By adopting the above technical solution, when the valve stem moves toward the liquid inlet, the valve needle is inserted into the liquid inlet to close the liquid inlet. The liquid inlet is connected, and if the pressure in the pump chamber is negative at this time, the liquid in the pump chamber will not flow out through the liquid inlet. The valve needle and the liquid inlet are combined to form the first one-way structure. The plastic valve needle replaces the conventional glass sphere for sealing, which is convenient for the recycling of the pressing pump. The valve needle straight-through seal is adopted, so that this press pump has high sealing performance.

Optionally, the pressing seat is fixedly connected with a valve stem made of plastic material, the piston is sleeved outside the valve stem and is slidably connected with the valve stem, the pressing seat is provided with a pressing portion, and the valve stem is provided with a limiting portion. , the pressing part and the limiting part are respectively located on both sides of the sliding direction of the piston, and the pressing part and the limiting part limit the sliding range of the piston relative to the valve stem; the second one-way structure includes a A communication port, a movable gap formed between the limiting portion and the piston, the communication port communicates the liquid outlet and the movable gap, and the piston can slide relative to the valve stem to open or close the movable gap.

By adopting the above technical solution, when the user presses the pressing seat, the pressing part and the valve stem move towards the pump chamber. Due to the frictional force between the piston and the seat, the piston will not move temporarily, and the valve stem will move relative to the piston. The gap is opened, and the active gap will conduct the pump cavity and the liquid outlet. When the valve rod slides away from the pump chamber, due to the friction between the piston and the base, the piston will not move temporarily, and the valve rod will move relative to the piston. As the valve rod continues to move, the limit part abuts the piston and The piston is driven to move and the active gap is closed. To sum up, the second one-way structure realizes the one-way conduction function, and the second one-way structure is made of plastic.

Optionally, the end of the piston facing the liquid outlet is provided with a first insert groove into which the pressure supply portion is inserted, the piston is provided with a convex ring facing the pressure portion, and a sliding seal is established between the piston and the pressure portion through the convex ring. .

By adopting the above technical solution, a sliding seal is established between the piston through the convex ring and the pressure part, so that when the piston slides relative to the valve stem, the liquid is not easy to leak out of the pump cavity through the space between the piston and the pressure part. At the same time, the pressing part is inserted and matched with the first inserting groove, which improves the stability of the pressing part driving the piston to move.

Optionally, the base includes a pump body and a gland, the pump cavity is located in the pump body, the end of the pump body facing away from the liquid inlet is open, and the gland is located at the opening of the pump body facing away from the liquid inlet. and fixed with the pump body, the gland restricts the separation of the piston from the pump body.

By adopting the above technical solution, when the pump body and the gland are separated, the disassembly and assembly of the piston is facilitated; when the pump body and the gland are installed, the gland restricts the separation of the piston and the pump body, thereby improving the structural stability of the pressing pump.

Optionally, a ventilation gap is provided between the pressing seat and the base, and an inner ventilation hole is provided on the outer wall of the base; when the piston moves in the direction of the liquid inlet, the ventilation gap communicates with the inner cavity through the pump body. The air holes are connected, and when the piston moves toward the liquid outlet, the side walls of the piston face and close the inner air hole.

By adopting the above technical solution, when the pressing seat moves toward the pump body, the piston slides through the inner vent hole, and the outside air communicates with the inside of the bottle through the ventilation gap, the inner cavity of the pump body, and the inner vent hole, so that the air pressure inside and outside the bottle is balanced. The liquid in the bottle can be easily drawn out. When the pressing seat moves away from the pump body, the piston closes the inner vent hole through the side wall, the air in the bottle does not circulate with the outside world, and the evaporation loss of the liquid in the bottle is reduced.

Optionally, the piston includes a sliding sleeve connected with the valve stem, a sealing part in contact with the inner wall of the pump cavity, and a connecting part connecting the sliding sleeve and the sealing part, and the sealing part includes a first sealing part close to the liquid outlet. , Close to the second sealing part of the liquid inlet, the outer diameter of the first sealing part gradually expands towards the liquid outlet, and the outer diameter of the second sealing part gradually expands towards the liquid inlet; After the piston moves in the direction of the liquid outlet, the inner vent hole faces between the first sealing part and the second sealing part.

By adopting the above technical solution, the edges of the end portions of the first sealing portion and the second sealing portion that are away from each other are pressed against the inner wall of the pump body to form a double-layer seal and improve the sealing effect. The side wall of the piston faces and closes the inner vent hole, the inner vent hole faces the position between the first sealing part and the second sealing part, the first sealing part and the second sealing part cooperate, and the sealing effect of the inner vent hole is better .

Optionally, the material of the valve stem and the valve needle is PP, and the material of the piston is PE.

By adopting the above technical solutions, the materials of PP and PE are safe and non-toxic, and can be fused after melting.

Optionally, the inner wall of the liquid inlet is provided with fixed protrusions along the circumferential direction.

By adopting the above technical solution, the liquid inlet is used for inserting the suction pipe, and the fixing protrusion is used for pressing against the outer wall of the suction pipe, so as to improve the stability of the installation of the suction pipe.

To sum up, the present application includes at least one of the following beneficial technical effects:

1. Use plastic to replace the parts of the press pump containing metal and glass materials, which is convenient for secondary recovery and recycling;

2. By setting the plastic elastic parts of TPE material, the all-plastic press pump has the characteristics of high explosive force, high resilience and high sealing performance;

3. The valve needle straight-through seal is adopted at the liquid inlet, so that the all-plastic press pump has high sealing performance.

Description of drawings

FIG. 1 is a perspective view of an all-plastic press pump according to an embodiment of the present application.

Figure 2 is an exploded view of the embodiment.

FIG. 3 is a cross-sectional view of the embodiment.

FIG. 4 is an enlarged view of part A in FIG. 3 .

FIG. 5 is a first use state diagram of the embodiment.

FIG. 6 is a second use state diagram of the embodiment.

Description of reference numerals: 1. Base; 2. Pressing seat; 3. Plastic elastic part; 10. Liquid inlet; 21. Liquid outlet; 11. Pump body; 12. Gland; 101. Fixed protrusion; 13. Pump chamber; 4. Piston; 22. Raised edge; 31. First mounting part; 32. Second mounting part; 33. Elastic part; 5. Valve stem; 51. Liquid outlet channel; 52. Valve needle; 41. Slide sleeve; 421, first sealing part; 422, second sealing part; 43, connecting part; 23, pressing part; 53, limiting part; 44, first inserting groove; 45, second inserting groove; 411, convex ring 54, communication port; 55, activity clearance; 231, convex part; 34, outer ventilation hole; 121, boss; 6, ventilation clearance; 111, inner ventilation hole.

Detailed ways

The present application will be further described in detail below in conjunction with accompanying drawings 1-6.

The embodiment of the present application discloses an all-plastic press pump. 1 and 2, the all-plastic press pump includes a base 1, a press base 2 slidably connected to the base 1, and the sliding direction of the press base 2 is along the length direction of the base 1, wherein the base 1 is used to fix the bottle, and the press base 2 Used for manual pressing by the user. A plastic elastic member 3 of TPE material is arranged between the pressing base 2 and the base 1 . When the pressing base 2 is pressed, the plastic elastic member 3 elastically deforms, and the restoring force of the plastic elastic member 3 drives the pressing base 2 away from the base 1 . The base 1, the pressing seat 2, and the plastic elastic member 3 are all cylindrical, and the axes of the three coincide. There is a liquid outlet 21 .

2 and 3 , the base 1 includes a pump body 11 and a gland 12 . The interior of the pump body 11 is hollow, and the liquid inlet 10 is provided in the pump body 11 . The liquid inlet 10 is used for the insertion of the suction pipe. The inner wall of the liquid inlet 10 is provided with a fixed protrusion 101 along the circumferential direction. The fixed protrusion 101 is in the shape of an inverted tooth. stability.

The liquid inlet 10 communicates with the inner cavity of the pump body 11 , and the part of the hollow part of the pump body 11 close to the liquid inlet 10 is the pump cavity 13 . The end of the pump body 11 facing away from the liquid inlet 10 is open, the gland 12 is located at the opening of the pump body 11 away from the liquid inlet 10 , the gland 12 partially extends into the pump body 11 , and the gap between the gland 12 and the pump body 11 is Secured by snap-fit. A piston 4 is slidably arranged in the pump body 11. The sliding direction of the piston 4 is along the length direction of the base 1. The piston 4 is in sliding contact with the inner wall of the pump body 11 through the outer side wall to establish a sliding seal. The pump cavity 13 is located at the piston 4 and the liquid inlet 10. In between, after the piston 4 and the gland 12 are sequentially installed on the pump body 11 , the gland 12 protrudes from the inner wall of the pump body 11 , and the gland 12 restricts the separation of the piston 4 from the pump body 11 .

Referring to FIG. 3 , the plastic elastic member 3 is a cylindrical structure with open ends and closed side walls. The plastic elastic member 3 is sleeved outside the pressing seat 2 . The end of the pressing seat 2 facing away from the base 1 is integrally fixed with a raised edge 22 . The plastic elastic member 3 includes a first mounting portion 31 connected with the pressing base 2, a second mounting portion 32 connected with the base 1, and an elastic portion 33 connecting the first mounting portion 31 and the second mounting portion 32. The first mounting portion The cross-sectional outer diameter of 31 is smaller than the cross-sectional outer diameter of the second mounting portion 32, the cross-sectional inner diameter of the first mounting portion 31 is smaller than the cross-sectional inner diameter of the second mounting portion 32, and the diameter of the second mounting portion 32 is away from the first mounting portion 32. The direction of the portion 31 is further tapered. The plastic elastic member 3 is integrally formed of TPE material. When the plastic elastic member 3 is compressed, the elastic portion 33 mainly generates deformation and generates a restoring force, and the second mounting portion 32 also generates deformation to assist in generating the restoring force. The plastic elastic part 3 made of TPE material is soft to the touch, and has good fatigue resistance and temperature resistance, and the side wall of the plastic elastic part 3 is closed, so that the all-plastic pressure pump has the characteristics of high resilience, high sealing performance and fatigue resistance .

A valve stem 5 made of plastic material is passed through the pressing seat 2 . The axis of the valve stem 5 coincides with the axis of the pressing seat 2. The end of the valve stem 5 passes through the gland 12 and then extends into the pump body 11. The outer wall of the valve stem 5 and the pressing seat 2 are fixed by clamping, and the valve stem 5 A liquid outlet channel 51 is provided inside to communicate with the liquid outlet 21 . The base 1 is provided with a first one-way structure and a second one-way structure. The first one-way structure and the second one-way structure make the liquid flow in one direction along the liquid inlet 10 , the pump cavity 13 and the liquid outlet 21 .

The first one-way structure is close to the liquid inlet 10. The first one-way structure includes a valve needle 52 that is integrally fixed with the valve stem 5. The valve needle 52 is fixed on the end of the valve stem 5 facing the liquid inlet 10. When the pressing seat 2 slides, the valve needle 52 can close or open the liquid inlet 10 by sliding. In the specific setting, when the pressing seat 2 overcomes the elastic force of the plastic elastic member 3 and moves toward the pump body 11, the valve needle 52 is inserted into the liquid inlet 10 and closes the liquid inlet 10; when the pressing seat 2 moves away from the pump body 11 When moving to the limit, the end of the valve needle 52 is just separated from the pump body 11 so that the liquid inlet 10 and the pump cavity 13 are connected.

Referring to FIG. 4 , the piston 4 includes a sliding sleeve 41 connected with the valve stem 5 , a sealing part in contact with the inner wall of the pump chamber 13 , and a connecting part 43 connecting the sliding sleeve 41 with the sealing part. The piston 4 is sleeved on the valve through the sliding sleeve 41 outside the stem 5 and can slide relative to the valve stem 5 . The end of the pressing seat 2 facing the pump chamber 13 is integrally fixed with a pressing portion 23 , and the pressing portion 23 surrounds the outer circumferential side wall of the valve stem 5 in a ring shape; the end portion of the valve stem 5 close to the pump chamber 13 is integrally fixed with a limiting portion 53 , the limiting portion 53 protrudes out of the side wall of the valve stem 5 along the circumferential direction of the valve stem 5 . The pressing portion 23 and the limiting portion 53 are respectively located on both sides of the sliding direction of the piston 4. The pressing portion 23 and the limiting portion 53 limit the sliding range of the piston 4 relative to the valve stem 5, so that only a small amount of movement between the piston 4 and the valve stem 5 can be achieved. relative sliding.

The end of the piston 4 facing the liquid outlet 21 is provided with a first inserting groove 44 into which the pressure supply portion 23 is inserted, and the first inserting groove 44 is an annular groove. When the piston 4 slides relative to the valve stem 5, the pressing portion 23 is in sliding contact with the groove wall of the first inserting groove 44; when the pressing portion 23 moves toward the pump chamber 13, the pressing portion 23 abuts the first inserting groove 44 through the end The bottom of the groove pushes the piston 4 to move, and the cooperation between the pressing part 23 and the first insert groove 44 improves the sliding stability of the piston 4 . The end of the piston 4 facing the liquid inlet 10 is provided with a second inserting groove 45 into which the limiting portion 53 is inserted. When the valve rod 5 moves toward the liquid outlet 21 , the cooperation between the limiting portion 53 and the second insert groove 45 improves the sliding stability of the piston 4 .

The outer side wall of the sliding sleeve 41 is provided with a convex ring 411 facing the pressing part 23 . The convex ring 411 is integrally formed with the sliding sleeve 41 , and the piston 4 abuts the pressing part 23 through the convex ring 411 , so that a sliding seal is established between the piston 4 and the pressing part 23 . The sealing part includes a first sealing part 421 close to the liquid outlet 21 and a second sealing part 422 close to the liquid inlet 10 . The outer diameter of the second sealing portion 422 gradually expands in the direction of the direction. The edges of the end portions of the first sealing portion 421 and the second sealing portion 422 away from each other are pressed against the inner wall of the pump body 11 to form a double-layered seal and improve the sealing effect. The sealing part cooperates with the convex ring 411 , so that a sliding sealing structure is formed between the piston 4 and the pressing part 23 and between the piston 4 and the pump body 11 , and the liquid in the pump chamber 13 will not leak to the other side of the piston 4 .

3 and 4 , the second one-way structure is arranged between the piston 4 and the valve stem 5 . The second one-way structure includes a communication port 54 provided on the outer wall of the valve stem 5 and a movable gap 55 formed between the limiting portion 53 and the piston 4 . The channel 51 and the movable gap 55 communicate with each other. The movable gap 55 is switched on and off by the relative sliding of the piston 4 and the valve rod 5. When the piston 4 abuts the limiter 53 through the sliding sleeve 41, the movable gap 55 is closed; when the sliding sleeve 41 is separated from the limiter 53, the movable gap 55 is closed. The gap 55 is opened, and the movable gap 55 communicates the pump chamber 13 and the communication port 54 .

The outer wall of the pressing portion 23 is integrally formed with a raised portion 231 . The raised portion 231 is located on the side of the pressing cover 12 facing the pump chamber 13 , and the raised portion 231 provides resistance for the pressing portion 23 to pass through the pressing cover 12 . Under the elastic force of the plastic elastic member 3 , the pressing base 2 tends to pull out of the base 1 .

The outer wall of the plastic elastic member 3 is provided with an outer ventilation hole 34 , which is located at the end of the second mounting portion 32 close to the gland 12 , and the outer ventilation hole 34 communicates the inner and outer walls of the plastic elastic member 3 . The end face of the gland 12 facing the plastic elastic member 3 is provided with a boss 121 , the outer side wall of the boss 121 is close to the outer vent hole 34 , and the height of the boss 121 protruding from the end face of the pump body 11 is higher than the outer vent hole 34 . A ventilation gap 6 is provided between the pressing seat 2 and the pressing cover 12 . The ventilation gap 6 passes through both ends of the pressing cover 12 . The outer wall of the pump body 11 is provided with an inner ventilation hole 111 , and the inner ventilation hole 111 penetrates to the inner wall of the pump body 11 . The position of the inner vent hole 111 is set as follows: when the piston 4 moves in the direction of the liquid inlet 10, the ventilation gap 6 communicates with the inner vent hole 111 through the inner cavity of the pump body 11; when the piston 4 moves in the direction of the liquid outlet 21, the piston 4. The side wall faces and closes the inner vent hole 111. The inner vent hole 111 faces the position between the first sealing portion 421 and the second sealing portion 422. The first sealing portion 421 and the second sealing portion 422 cooperate to communicate with each other. The air hole 111 has a better sealing effect.

In terms of materials, the valve stem 5, the valve needle 52 and the gland 12 are made of PE, specifically HDPE; the pump body 11 and the pressing seat 2 are made of PP; the piston 4 is made of PE, specifically LDPE. The various plastic parts of the press pump can be melted together after being melted.

The implementation principle of an all-plastic press pump according to the embodiment of the present application is as follows: referring to FIG. 5 , during installation, the suction pipe is inserted into the liquid inlet 10 , the nozzle is mounted on the liquid outlet 21 , and the press pump is installed through the pump body 11 . For the bottle, the plastic elastic member 3 and the outer ventilation hole 34 are located outside the bottle, the inner ventilation hole 111 is located in the bottle, and the liquid outlet 21 is located directly above the liquid inlet 10 . The closed plastic elastic member 3 has good waterproof and dustproof capabilities, and external dust and sewage are not easy to enter the pressing pump;

When the user does not operate the pressing pump, the piston 4 closes the inner vent hole 111 through the side wall, the air in the bottle does not circulate with the outside, reducing the evaporation loss of the liquid in the bottle, and the liquid will not pass through the inner vent hole 111 to the pressing pump when the bottle is inverted. external leakage. The piston 4 abuts against the limiting portion 53 to close the movable gap 55, and the pump cavity 13 is filled with liquid.

Referring to FIG. 6 , when the user presses the pressing seat 2 downward, the pressing part 23 and the valve stem 5 move downward. Due to the frictional force between the piston 4 and the pump body 11, the piston 4 will not move temporarily, and the valve stem 5 The movement gap 55 opens with respect to the downward movement of the piston 4 . After the valve stem 5 moves down, the valve needle 52 is inserted into the liquid inlet 10, and the valve needle 52 closes the liquid inlet 10. As the pressing seat 2 continues to move downward, the pressing part 23 starts to drive the piston 4 to move, and the pump chamber 13 The space is compressed, and the liquid in the pump cavity 13 is discharged through the movable gap 55, the communication port 54, the liquid outlet channel 51, and the liquid outlet 21 to complete the pumping of the liquid. After the pressing seat 2 is pressed down to the bottom, the outside air communicates with the bottle through the outer vent hole 34, the inner cavity of the plastic elastic member 3, the ventilation gap 6, the inner cavity of the pump body 11, and the inner vent hole 111, so that the air pressure inside and outside the bottle is balanced. .

5 and 6 , after the user releases the pressing base 2 , the elastic force of the plastic elastic member 3 drives the pressing base 2 to move upward and reset. During the upward movement of the valve rod 5, due to the friction between the piston 4 and the pump body 11, the piston 4 will not move temporarily, and the valve rod 5 moves upward relative to the piston 4. As the valve rod 5 continues to move upward, the limit The position part 53 abuts the piston 4 and drives the piston 4 to move upward, and the movable gap 55 is closed; with the upward movement of the piston 4, a negative pressure is formed in the pump chamber 13. Under the action of the negative pressure in the cavity 13, the liquid in the suction pipe is sucked into the pump cavity 13 and stored, waiting for the next pressing.

This press pump can be used for lotion pump, spray pump, foam pump, etc. according to the application and different nozzles.

The all-plastic press pump replaces the traditional metal spring with a plastic elastic member 3, and uses the valve needle 52 to replace the glass ball to achieve one-way sealing. The first one-way structure and the second one-way structure are made of plastic, and the entire press pump is It is plastic material. After recycling the press pump, it does not need to be disassembled and separated, and can be directly melted into liquid plastic and re-injected into other products for use, which reduces the difficulty of recycling. Compared with the existing press pump, all formaldehyde-containing parts are replaced by PE material, which is environmentally friendly and non-toxic.

The above are all preferred embodiments of the present application, and are not intended to limit the protection scope of the present application. Therefore: all equivalent changes made according to the structure, shape and principle of the present application should be covered within the scope of the present application. Inside.

Claims

An all-plastic pressing pump, comprising a base (1) made of plastic, a pump cavity (13), a liquid inlet (10) and a liquid outlet (21) communicating with the pump cavity (13) are provided inside the all-plastic pressing pump, The liquid inlet (10) is provided with a first one-way structure, the liquid outlet (21) is provided with a second one-way structure, and the first one-way structure and the second one-way structure make the liquid flow along the The liquid inlet (10), the pump cavity (13), and the liquid outlet (21) flow in one direction, the base (1) is slidably connected with a pressing seat (2), and the pressing seat (2) is connected with a piston (4) ), the piston (4) is slidably connected with the cavity wall of the pump cavity (13); it is characterized in that a plastic elastic member (3) is arranged between the pressing seat (2) and the base (1), and the plastic elastic The component (3) includes a first mounting portion (31) connected with the pressing seat (2), a second mounting portion (32) connected with the base (1), and the first mounting portion (31) and the second mounting portion (32). 32) The connecting elastic part (33), the cross-sectional dimensions of the first mounting part (31) and the second mounting part (32) are different, the plastic elastic part (3) is integrally formed by TPE material, and the first mounting part (31) and the second mounting part (32) The one-way structure, the second one-way structure, the pressing seat (2) and the piston (4) are all made of plastic.
An all-plastic press pump according to claim 1, characterized in that: the plastic elastic member (3) is a cylindrical structure with open ends at both ends and closed side walls.
The all-plastic pressing pump according to claim 1, characterized in that: the pressing seat (2) is fixedly connected with a valve rod (5) made of plastic material, and the first one-way structure comprises a valve needle (52) The valve needle (52) is arranged at the end of the valve stem (5) facing the liquid inlet (10), and the valve needle (52) can close or open the liquid inlet (10) by sliding.
An all-plastic pressing pump according to claim 1, characterized in that: the pressing seat (2) is fixedly connected with a valve rod (5) made of plastic material, and the piston (4) is sleeved on the valve rod (5). ) and is slidably connected with the valve stem (5), the pressing seat (2) is provided with a pressing portion (23), the valve stem (5) is provided with a limiting portion (53), the pressing portion (23), The limiting parts (53) are respectively located on both sides of the sliding direction of the piston (4), and the pressing part (23) and the limiting part (53) limit the sliding range of the piston (4) relative to the valve rod (5); the The second one-way structure includes a communication port (54) provided on the outer wall of the valve stem (5), and a movable gap (55) formed between the limiting portion (53) and the piston (4). The communication port (54) connects the The liquid outlet (21) is communicated with the movable gap (55), and the piston (4) can slide relative to the valve stem (5) to open or close the movable gap (55).
An all-plastic press pump according to claim 4, characterized in that: the end of the piston (4) facing the liquid outlet (21) is provided with a first insert groove (44) into which the pressure supply portion (23) is inserted. ), the piston (4) is provided with a convex ring (411) toward the pressing part (23), and the piston (4) establishes a sliding seal between the convex ring (411) and the pressing part (23).
The all-plastic press pump according to claim 1, characterized in that: the base (1) comprises a pump body (11) and a gland (12), and the pump cavity (13) is located in the pump body (11) Inside, the end of the pump body (11) facing away from the liquid inlet (10) is open, and the gland (12) is located at the opening of the pump body (11) facing away from the liquid inlet (10) and is connected with the pump body (11) is fixed, and the gland (12) restricts the separation of the piston (4) from the pump body (11).
The all-plastic press pump according to claim 1, characterized in that: a ventilation gap (6) is provided between the press seat (2) and the base (1), and an inner wall of the base (1) is provided with an inner wall. The ventilation hole (111); when the piston (4) moves toward the liquid inlet (10), the ventilation gap (6) communicates with the inner ventilation hole (111) through the inner cavity of the pump body (11). After the piston (4) moves in the direction of the liquid outlet (21), the side wall of the piston (4) is facing and closes the inner vent hole (111).
An all-plastic press pump according to claim 7, characterized in that: the piston (4) comprises a sliding sleeve (41) connected with the valve stem (5), and a sealing part in contact with the inner wall of the pump chamber (13) , the connecting part (43) connecting the sliding sleeve (41) with the sealing part, the sealing part comprises a first sealing part (421) close to the liquid outlet (21) and a second sealing part (421) close to the liquid inlet (10) part (422), the outer diameter of the first sealing part (421) gradually expands in the direction of the liquid outlet (21), and the outer diameter of the second sealing part (422) in the direction of the liquid inlet (10) Gradually expanding; when the piston (4) moves toward the liquid outlet (21), the inner vent hole (111) faces between the first sealing part (421) and the second sealing part (422).
An all-plastic press pump according to claim 3, characterized in that: the material of the valve stem (5) and the valve needle (52) is PP, and the material of the piston (4) is PE.
The all-plastic press pump according to claim 1, characterized in that: the inner wall of the liquid inlet (10) is provided with a fixed protrusion (101) along the circumferential direction.