A compression pump

Abstract

This invention discloses a push-button pump, the key technical features of which are: a pump housing, a piston, a pump rod, and a pressing sleeve; a pump chamber is provided inside the pump housing, and the piston is disposed within the pump chamber and connected to the inner wall of the pump chamber; the first end of the pump rod is connected to the piston, and the pressing sleeve is fitted around the outer periphery of the second end of the pump rod, forming a gap between the pressing sleeve and the pump rod; the inner periphery of the pressing sleeve and the outer periphery of the pump rod are interlocked, achieving bidirectional movement limitation along the length of the pump rod. This invention can maintain stable and smooth piston operation during the pressing process.

Description

Technical Field

[0001] This invention relates to the field of pump technology, and more specifically, to a push-button pump. Background Technology

[0002] The press pump is the core component of press-type packaging bottles such as emulsion bottles. The press pump is integrated and installed at the bottle cap, which can realize the dispensing of emulsions and other paste or liquid materials, greatly improving the convenience of use for users.

[0003] Chinese invention patent CN210455794U discloses a novel emulsion bottle pump core. Its key technical features include a pressing sleeve, a connecting rod, a connector, and a pump body. The connecting rod is inserted into the pressing sleeve and is rotatably locked to the pressing sleeve. A piston is sleeved on the lower end of the connecting rod. A water sealing chamber is provided at the lower end of the pump body. A water sealing plate is installed in the water sealing chamber. A liquid suction port is provided below the water sealing chamber. The connector is pressed and inserted into the pump body. The pressing sleeve is inserted into the connector. A spring is sleeved on the pressing sleeve. The spring is located between the pressing sleeve and the connector.

[0004] The piston is a key component in the entire pump core structure. It pumps liquid by creating a sealed piston movement between itself and the inner wall of the pump body. The seal between the piston and the pump body is crucial for the normal operation of the entire pump.

[0005] In current push-button pumps, the pressing sleeve and connecting rod are fixed together, with the two achieving a snug fit through interference. During use, the pressing sleeve drives the connecting rod, which in turn drives the piston to produce a pumping action.

[0006] However, if the pressure applied to the pressing sleeve is tilted at a certain angle, the tilted pressing sleeve will cause the connecting rod to tilt and wobble synchronously. The wobble of the connecting rod will then cause the piston to float and wobble accordingly. This can easily lead to a certain amount of floating wobble between the piston and the inner wall of the pump body, which may affect the sealing state between the piston and the inner wall of the pump body during piston movement.

[0007] To avoid potential leakage between the piston and the pump body wall, the fitting precision of the piston and other components needs to be improved. Higher precision would reduce the runout caused by the press sleeve, connecting rod, and piston. However, improving the fitting precision of the mating parts would significantly increase the production cost of the press pump, and would not effectively solve the aforementioned problems.

[0008] Therefore, a new solution is needed to address this problem. Summary of the Invention

[0009] The purpose of this invention is to solve the above-mentioned problems by providing a press pump that can maintain stable and smooth piston operation during the pressing process.

[0010] The above-mentioned technical objective of the present invention is achieved through the following technical solution: a press pump, comprising a pump housing, a piston, a pump rod, and a press sleeve, wherein the pump housing is provided with a pump pressure chamber, the piston is disposed in the pump pressure chamber and connected to the inner wall of the pump pressure chamber; the first end of the pump rod is connected to the piston, the press sleeve is sleeved on the outer periphery of the second end of the pump rod, and a relatively movable gap is formed between the inner periphery of the press sleeve and the outer periphery of the pump rod; the press sleeve and the pump rod are engaged with each other to realize bidirectional linkage along the length direction of the pump rod.

[0011] The present invention is further configured such that the inner circumference of the pressing sleeve is provided with a limiting protrusion, and the outer circumference of the pump rod is provided with a limiting groove; the limiting protrusion is engaged in the limiting groove and has a movable space along the length direction of the pump rod.

[0012] The present invention is further configured such that the limiting groove has an annular structure and the limiting protrusion has an annular structure adapted to the limiting groove.

[0013] The present invention is further configured such that the limiting protrusion has a limiting surface one facing the piston and a limiting surface two facing away from the piston; the limiting groove has a limiting surface three facing away from the piston and a limiting surface four facing the piston, the limiting surface three being opposite to the limiting surface one and the limiting surface four being opposite to the limiting surface two.

[0014] The present invention is further configured such that the limiting protrusion has a limiting surface one facing the piston, the limiting surface one being an flared shape that gradually expands towards the piston; the limiting groove has a limiting surface three opposite to the limiting surface one, the limiting surface three being an flared shape that gradually expands towards the piston, and is adapted to the limiting surface one.

[0015] The present invention is further configured such that the first end of the pump rod forms a constricted portion that gradually narrows in the direction away from the piston.

[0016] The present invention is further configured such that the limiting protrusion has a plurality of notches, and the limiting protrusion forms a plurality of annularly discontinuously distributed protrusions.

[0017] The present invention is further configured such that a groove is provided at the first end of the pump rod, the groove extends toward the second end and extends to the limiting groove.

[0018] The present invention is further configured such that the limiting groove has a bottom surface facing the inner periphery, and the limiting protrusion has a top surface facing the outer periphery; the top surface and the bottom surface face each other and form a gap.

[0019] The invention is further configured to include a spring, a one-way valve, and a mounting sleeve. The spring elastically acts on the pressing sleeve in a direction away from the piston. The pump housing has an inlet, and the one-way valve is located at the inlet and is used for unidirectional flow toward the pump chamber. The pump housing has an installation port, and the mounting sleeve has an annular structure and is installed at the installation port to press against and limit the piston. The pressing sleeve extends out of the pump housing from the inner circumference of the mounting sleeve.

[0020] The invention is further configured such that the piston has an annular structure, with its outer periphery connected to the inner wall of the pump chamber and its inner periphery sleeved around the outer periphery of the pump rod; the piston can slide and adjust along the length of the pump rod and has a sliding stroke relative to the pump rod; a limiting seat is fixedly connected to the second end of the pump rod, with a tapered protrusion between the limiting seat and the pump rod, and the sliding stroke of the piston is limited by the limiting seat and the pressing sleeve; a valve hole is provided inside the pump rod, the valve hole is open towards the second end, and a through hole communicating with the valve hole is provided on the outer periphery of the second end of the valve rod near the limiting seat; during the sliding stroke, the piston abuts against the limiting seat to close the through hole, and abuts against the pressing sleeve to open the through hole.

[0021] In summary, the present invention has the following beneficial effects:

[0022] By employing a movable linkage structure between the pressing sleeve and the pump rod, the impact of tilting and swaying on the pressing sleeve being directly transmitted to the piston is reduced, thus decreasing piston swaying and ensuring stable and normal piston operation. A clearance allows for relative movement between the pressing sleeve and the pump rod. The pressing force caused by tilting and swaying on the pressing sleeve is absorbed by the pressing sleeve's independent swaying, reducing the tilting and swaying of the pump rod, and consequently reducing the impact of the pump rod's tilting and swaying on the piston. Meanwhile, the downward pressing force of the pressing sleeve can still be transmitted through mutual resistance, ensuring stable and smooth operation of the pump rod and piston. Attached Figure Description

[0023] Figure 1 This is a perspective view of a push pump according to the present invention;

[0024] Figure 2 This is a cross-sectional view of a push pump according to the present invention;

[0025] Figure 3 This is a schematic diagram of the connection structure between the pressing sleeve and the pump rod of the present invention;

[0026] Figure 4 This is an exploded view of a push-button pump according to the present invention;

[0027] Figure 5 This is an exploded cross-sectional view of a press pump according to the present invention.

[0028] Reference numerals: 1. Pump housing; 11. Inlet; 12. Mounting port; 13. Pump pressure chamber; 2. Piston; 3. Pump rod; 301. First end; 302. Second end; 31. Limiting seat; 32. Conical protrusion; 33. Valve hole; 34. Through hole; 35. Limiting groove; 351. Limiting surface three; 352. Limiting surface four; 353. Bottom surface; 36. Groove; 37. Narrowing part; 4. Pressing sleeve; 41. Limiting protrusion; 411. Limiting surface one; 412. Limiting surface two; 413. Top surface; 42. Notch; 5. Mounting sleeve; 6. One-way valve; 61. One-way plug; 62. Support ring; 63. Connecting piece; 7. Gap; 8. Movement space. Detailed Implementation

[0029] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0030] This embodiment discloses a push-button pump, such as Figure 1-5 As shown, the pump includes a pump housing 1, a piston 2, a pump rod 3, a pressing sleeve 4, a spring, a one-way valve 6, and a mounting sleeve 5. These components are combined to form a pressing pump, which can pump liquid materials by pressing.

[0031] The pump casing 1 has a cylindrical structure and a hollow pump chamber 13 inside. The pump chamber 13 has a cylindrical structure, and the piston 2 is adapted to the pump chamber 13. The piston 2 is installed inside the pump chamber 13 and forms a piston 2 connection structure with the inner wall of the pump chamber 13.

[0032] One end of the pump casing 1 has an inlet 11, and the other end has a mounting port 12. The inlet 11 allows liquid to enter the pump pressure chamber 13, while the mounting port 12 is used to install other components. A one-way valve 6 is installed at the inlet 11. The one-way valve 6 includes a support ring 62, a one-way plug 61, and a connecting piece 63. The one-way plug 61 is connected to the inner circumference of the support ring 62 through the connecting piece 63, and can realize the floating adjustment of the one-way valve 6.

[0033] The support ring 62 is embedded and fixed inside the liquid inlet 11. The one-way plug 61 has a hemispherical structure and abuts against the inside of the liquid inlet 11, achieving a pressure seal at the liquid inlet 11. During the process of liquid entering the pump chamber 13 through the liquid inlet 11, the liquid pushes open the one-way plug 61, allowing one-way liquid entry at the liquid inlet 11. During the process of the pump chamber 13 being pressurized, the liquid presses the one-way plug 61 against the liquid inlet 11, achieving one-way closure at the liquid inlet 11.

[0034] The mounting sleeve 5 has a ring-shaped structure and is installed at the mounting port 12. A portion of the mounting sleeve 5 extends into the mounting port 12, allowing for a snap-fit ​​and secure installation. The mounting sleeve 5 limits the movement of the piston 2, stably confining it within the pump chamber 13. The outer circumference of the pressing sleeve 4 matches the inner circumference of the mounting sleeve 5, enabling smooth pressing and adjustment of the pressing sleeve 4.

[0035] The pump rod 3 is arranged along the direction of movement of the piston 2. The piston 2 and the pressing sleeve 4 can be connected through the pump rod 3, so that the pressing sleeve 4 can drive the piston 2 to move. The first end 301 of the pump rod 3 extends into the piston 2 and is connected to the piston 2; the second end 302 of the pump rod 3 extends toward the pressing sleeve 4 and is connected to the pressing sleeve 4.

[0036] The piston 2 has an annular structure, with its outer circumference connected to the inner wall of the pump chamber 13, and its inner circumference fitted around the outer circumference of the pump rod 3. The piston 2 can slide and adjust along the length of the pump rod 3 and has a sliding stroke relative to the pump rod 3. During the sliding process of the piston 2 relative to the pump housing 1, the piston 2 realizes pumping.

[0037] A protruding limiting seat 31 is formed at the second end 302 of the pump rod 3. The limiting seat 31 has an annular structure and can limit the movement of the piston 2. A conical protrusion 32 runs between the limiting seat 31 and the pump rod 3. When the piston 2 moves toward the limiting seat 31, the lower end face of the piston 2 can press against the conical protrusion 32, thereby achieving a seal between the piston 2 and the pump rod 3.

[0038] The sliding stroke of piston 2 relative to pump rod 3 is limited by the pressure of limit seat 31 and pressing sleeve 4. The upper end of piston 2 is blocked and limited by the lower side of pressing sleeve 4, and the lower end is blocked and limited by limit seat 31 and conical protrusion 32. A valve hole 33 is opened inside pump rod 3, which is open towards the second end 302. A through hole 34 is opened on the outer periphery of the second end 302 of the valve rod near limit seat 31. The through hole 34 connects to valve hole 33, realizing communication between valve hole 33 and the outer periphery of pump rod 3.

[0039] During its sliding stroke, piston 2 moves downward relative to pump rod 3 and abuts against limit seat 31. Piston 2 then abuts against conical protrusion 32, achieving a seal between piston 2 and pump rod 3, thus closing through hole 34. After piston 2 moves upward relative to pump rod 3, piston 2 abuts against pressing sleeve 4, separating the conical protrusion and opening through hole 34, allowing liquid to be output through pump rod 3.

[0040] The spring is sleeved and installed on the outer periphery of the pressing sleeve 4 (not shown in the figure), with its two ends pressing against the stepped surfaces of the pressing sleeve 4 and the mounting sleeve 5, respectively. The spring provides elastic force to the pressing sleeve 4 in the direction away from the piston 2, allowing the pressing sleeve 4 to automatically and elastically return to its original position after being pressed. Furthermore, after the pressing sleeve 4 returns to its original position, the piston 2 is limited by the mounting sleeve 5, enabling the piston 2 to close the through hole 34 on the outer periphery of the first end 301 of the pump rod 3.

[0041] The pressing sleeve 4 and the pump rod 3 form a movable connection structure. The pressing sleeve 4 is fitted around the outer periphery of the second end 302 of the pump rod 3, and a gap 7 is formed between the inner periphery of the pressing sleeve 4 and the outer periphery of the pump rod 3, allowing the pressing sleeve 4 and the pump rod 3 to tilt and swing relative to each other. During the pressing process of the pressing sleeve 4 pressing the pump rod 3, the pump rod 3 is axially supported by the piston 2, maintaining a stable connection between the piston 2 and the pump chamber 13. That is, when the pressing sleeve 4 tilts and swings during the pressing process, the pressing sleeve 4 can drive the pump rod 3 to press down, and then during the rising process of the pressing sleeve 4, it can also drive the pump rod 3 to return, thereby maintaining the bidirectional linkage between the pressing sleeve 4 and the pump rod 3 during the pressing and lifting processes.

[0042] The inner circumference of the pressing sleeve 4 is engaged with the outer circumference of the pump rod 3, so that the pressing sleeve 4 can form a force transmission with the pump rod 3, realizing bidirectional movement limitation along the length direction of the pump rod 3.

[0043] like Figure 2-5 As shown, a limiting protrusion 41 is provided on the inner circumference of the pressing sleeve 4, and a limiting groove 35 is provided on the outer circumference of the pump rod 3. The limiting protrusion 41 and the limiting groove are adapted to each other, so that the limiting protrusion 41 can be inserted into the limiting groove 35, so that the pump rod 3 and the pressing sleeve 4 form a mutually engaging structure. The limiting protrusion 41 is smaller than the limiting groove 35, so that there is a movable space 8 between the limiting protrusion 41 and the limiting groove 35, so that a movable space 8 along the length direction of the pump rod 3 can be formed between the pressing sleeve 4 and the pump rod 3. The pressing sleeve 4 produces an adaptive tilting and swaying during the pressing process. The pressing sleeve 4 will not drive the pump rod 3 to tilt or sway. The pump rod 3 can still stably follow the movement of the piston 2, thus preventing the piston 2 from tilting or swaying, and maintaining the smooth and stable movement of the piston 2.

[0044] The limiting groove 35 has an annular structure, and the limiting protrusion 41 has an annular structure that matches the limiting groove 35, thereby forming an annular snap-fit ​​structure between the pressing sleeve 4 and the pump rod 3, which can stably maintain the connection between the pressing sleeve 4 and the pump rod 3.

[0045] The limiting protrusion 41 has a limiting surface 411 facing the piston 2 and a limiting surface 412 facing away from the piston 2. Furthermore, the limiting groove 35 has a limiting surface 351 and a limiting surface 352. The limiting surface 351 and the limiting surface 411 face each other and can generate mutual pressure, thereby transmitting pressure in the direction of the piston 2; the limiting surface 352 and the limiting surface 412 face each other and can generate mutual pressure, thereby transmitting pressure in the direction away from the piston 2. Through the pressure transmission between the limiting surfaces, the linkage between the pressing sleeve 4 and the pump rod 3 can be achieved.

[0046] In addition, the limiting groove 35 also has a bottom surface 353 facing the inner periphery, and the bottom surface 353 has an annular structure; while the limiting protrusion 41 has a top surface 413 facing the outer periphery, and the top surface 413 also has an annular structure. The top surface 413 and the bottom surface 353 face each other and a gap 7 is formed between them. Through this gap 7, the limiting protrusion 41 and the limiting groove 35 can generate an adaptive tilting and swing, maintaining the movable linkage structure between the pressing sleeve 4 and the pump rod 3.

[0047] Furthermore, the limiting surface 411 at the limiting protrusion 41 is flared outwards, gradually widening towards the piston 2; the limiting surface 351 at the limiting groove 35 is also flared outwards, gradually widening towards the piston 2. The limiting surfaces 411 and 351 are mutually adapted to form a mutually nested conical structure. On the one hand, the conical structure allows the limiting surfaces 411 and 412 to have a certain centering effect during the pressing process of the pressing sleeve 4, thereby improving the stability of the pressing process of the pressing sleeve 4; on the other hand, the flared limiting surface 411 can form a guiding structure, and the pump rod 3 can play a guiding role during the pressing process of the pressing sleeve 4, improving the smoothness of the engagement between the two.

[0048] Furthermore, the first end 301 of the pump rod 3 forms a constricted portion 37 that gradually narrows in the direction away from the piston 2, and this constricted portion 37 can also serve as an inclined guiding structure. By adapting the constricted portion 37 with the limiting surface 411, the smoothness of the engagement between the pressing sleeve 4 and the pump body can be further improved.

[0049] Furthermore, the limiting protrusion 41 has several notches 42, which can divide the limiting protrusion 41 into several annularly distributed protrusions. The protrusions have an arc-shaped structure, and individual protrusions have a more flexible deformation range compared to the entire annular limiting protrusion ring, thereby improving the smoothness of the interlocking process between the limiting protrusion 41 and the limiting groove 35, and facilitating the assembly between the pressing sleeve 4 and the pump rod 3.

[0050] Furthermore, a slot 36 can be provided at the first end 301 of the pump rod 3. The slot 36 extends from the end face of the second end 302 toward the second end 302 of the pump rod 3, all the way to the limiting groove 35. The slot 36 divides the second end 302 of the pump rod 3 into two parts, and a deformable space is formed at the slot 36, so that the pump rod 3 can be smoothly engaged when it is inserted into the pressing sleeve 4.

[0051] The above description is merely a preferred embodiment of the present invention. The scope of protection of the present invention is not limited to the above embodiment. All technical solutions based on the concept of the present invention are within the scope of protection of the present invention. It should be noted that for those skilled in the art, various improvements and modifications that do not depart from the principles of the present invention should also be considered within the scope of protection of the present invention.

Claims

1. A push-button pump, characterized in that, The pump includes a pump housing (1), a piston (2), a pump rod (3), and a pressing sleeve (4). The pump housing (1) has a pump pressure chamber (13) inside. The piston (2) is located inside the pump pressure chamber (13) and is connected to the inner wall of the pump pressure chamber (13). The first end of the pump rod (3) is connected to the piston (2). The pressing sleeve (4) is sleeved on the outer periphery of the second end of the pump rod (3). A gap (7) is formed between the inner periphery of the pressing sleeve (4) and the outer periphery of the pump rod (3) that can move relative to each other. The pressing sleeve (4) and the pump rod (3) are interlocked to realize bidirectional linkage along the length of the pump rod (3). The inner circumference of the pressing sleeve (4) is provided with a limiting protrusion (41), and the outer circumference of the pump rod (3) is provided with a limiting groove (35); the limiting protrusion (41) is engaged in the limiting groove (35) and has a movable space (8) along the length direction of the pump rod (3); The limiting groove (35) has an annular structure, and the limiting protrusion (41) has an annular structure that matches the limiting groove (35); The limiting protrusion (41) has a limiting surface one (411) facing the piston (2), and the limiting surface one (411) is an flared shape that gradually expands towards the piston (2); the limiting groove (35) has a limiting surface three (351) opposite to the limiting surface one (411), and the limiting surface three (351) is an flared shape that gradually expands towards the piston (2) and is adapted to the limiting surface one (411); Limiting surface one (411) and limiting surface three (351) are adapted to each other to form a conical structure that is nested together; The limiting groove (35) has a bottom surface (353) facing the inner periphery, and the limiting protrusion (41) has a top surface (413) facing the outer periphery; the top surface (413) and the bottom surface (353) face each other and form a gap (7).

2. A push-button pump according to claim 1, characterized in that, The limiting protrusion (41) has a limiting surface one (411) facing the piston (2) and a limiting surface two (412) facing away from the piston (2); the limiting groove (35) has a limiting surface three (351) facing away from the piston (2) and a limiting surface four (352) facing the piston (2); the limiting surface three (351) is opposite to the limiting surface one (411), and the limiting surface four (352) is opposite to the limiting surface two (412).

3. A push-button pump according to claim 1, characterized in that, The first end of the pump rod (3) forms a constricted section (37) that gradually narrows in the direction away from the piston (2).

4. A push-button pump according to claim 1, characterized in that, The limiting protrusion (41) has several notches (42) and the limiting protrusion (41) forms several annularly discontinuously distributed protrusions.

5. A push-button pump according to claim 1, characterized in that, The pump rod (3) has a slot (36) at its first end, which extends toward the second end and extends to the limiting groove (35).

6. A push-pump according to any one of claims 1-5, characterized in that, It also includes a spring, a one-way valve (6), and a mounting sleeve (5). The spring acts elastically on the pressing sleeve (4) in the direction away from the piston (2). The pump housing (1) has an inlet (11). The one-way valve (6) is located at the inlet (11) and is used for unidirectional flow towards the pump pressure chamber (13). The pump housing (1) has an installation port (12). The mounting sleeve (5) has an annular structure and is installed at the installation port (12) to press against and limit the piston (2). The pressing sleeve (4) extends out of the pump housing (1) from the inner circumference of the mounting sleeve (5). The piston (2) has an annular structure. Its outer circumference is connected to the inner wall of the pump chamber (13), and its inner circumference is sleeved on the outer circumference of the pump rod (3). The piston (2) can slide and adjust along the length of the pump rod (3) and has a sliding stroke relative to the pump rod (3). The second end of the pump rod (3) is fixedly connected to a limiting seat (31). There is a tapered protrusion (32) between the limiting seat (31) and the pump rod (3). The sliding stroke of the piston (2) is limited by the limiting seat (31) and the pressing sleeve (4). The pump rod (3) is provided with a valve hole (33). The valve hole (33) is open towards the second end. A through hole (34) is provided on the outer circumference of the second end of the valve rod near the limiting seat (31). The piston (2) closes the through hole (34) by abutting against the limiting seat (31) and opens the through hole (34) by abutting against the pressing sleeve (4) within the sliding stroke.

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