All-plastic pressing pump
By employing a plastic elastic reset mechanism and rib design in the all-plastic push pump, the problem of sealing failure in the all-plastic push pump is solved, achieving sealing and leak-proof effects even when the pressure head is not fully reset.
Patent Information
- Application Number
- CN202422676175.6
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-11-04
- Publication Date
- 2026-01-27
- Estimated Expiration
- 2034-11-04
AI Technical Summary
The pressure head of the all-plastic push pump failed to fully return to the top dead center of the stroke, resulting in seal failure and problems such as product leakage or water entering the container.
The elastic reset mechanism, made of plastic, forms a sealing fit with the outer sleeve by setting ribs on the inner sleeve, ensuring that the seal can still be achieved when the pressure head is not fully reset. Combined with the balanced air hole design, it prevents product leakage.
It effectively prevents water from entering the pump and prevents product leakage, ensuring the sealing of the product inside the container and meeting the environmental protection requirements of all-plastic pumps.
Smart Images
Figure CN223832576U_ABST
Abstract
Description
Technical Field
[0001] This application relates to the field of product dispensing devices, and more specifically to an all-plastic push-button pump. Background Technology
[0002] Press pumps are widely used in the packaging containers of daily chemical products such as shower gel and shampoo to dispense the product from the container for consumer use.
[0003] Traditional push-pump pumps use a metal spring as an elastic reset mechanism. When the pump head is at its top dead center, the spring's elastic force presses the upper edge of the piston against the cylinder head or cylinder top, sealing the pump neck. Simultaneously, the spring presses the piston downwards against the piston head, sealing the upper check valve. This spring's elastic force achieves a good seal between the pump head nozzle and neck, helping to prevent product leakage when the pump is in its upper standby position.
[0004] Currently, to meet increasingly stringent environmental protection requirements, all-plastic pumps are being promoted. These pumps use a plastic elastic return mechanism instead of a metal spring. However, the elasticity of the plastic elastic return mechanism is weaker than that of a metal spring, and due to the inherent properties of plastic, the elasticity gradually diminishes with repeated use, resulting in the pump head not fully returning to its top dead center after use. This incomplete return of the pump head further leads to an incomplete seal at the pump neck and nozzle. An unsealed pump neck can cause water to enter the container during showering, contaminating the product inside. Alternatively, if the container with the pump is tilted or placed flat, product inside the container or the pump cylinder may leak through the unsealed pump neck.
[0005] Therefore, there is a need in this field to further improve the press pump to solve the problem of preventing water ingress and leakage when the press pump head is not fully reset to its top dead center. Utility Model Content
[0006] This application is made to address the problems existing in the prior art described above. The purpose of this application is to provide a structurally improved push pump that includes a resilient reset mechanism made of plastic, which can still achieve a seal at the pump neck when the pump head fails to fully return to its top dead center.
[0007] This application discloses an all-plastic push-button pump, which includes a movable part, a fixed part, and an elastic reset mechanism. The movable part is capable of reciprocating relative to the fixed part along the axial direction of the all-plastic push-button pump. The elastic reset mechanism is made of plastic material and is supported between the movable part and the fixed part. The movable part includes a pressure head, and an inner sleeve is formed below the pressure head. The fixed part includes a toothed sleeve, and an outer sleeve is formed on the upper part of the toothed sleeve. The inner sleeve can fit into the outer sleeve. A rib is formed on the inner sleeve, the outer diameter of which is larger than the inner diameter of the outer sleeve and also larger than the outer diameter of the inner sleeve except for the rib. The rib is configured such that a sealing fit can be formed between the inner surface of the outer sleeve of the toothed sleeve and the outer surface of the rib when the pressure head is reset to the top dead center of the stroke and when the pressure head is not fully reset to the top dead center of the stroke.
[0008] In the aforementioned all-plastic push pump, even if the pressure head is not fully reset to its top dead center, the outer sleeve of the toothed sleeve can still fit seamlessly with the ribs on the inner sleeve, thereby ensuring a seal between the pressure head and the toothed sleeve, preventing water from entering the push pump, and also preventing product leakage.
[0009] In one specific structure, a raised rib is formed at the lower end of the inner sleeve.
[0010] More specifically, in the axial direction of the all-plastic push pump, the length of the raised rib is greater than the length of the contact portion between the outer sleeve and the raised rib. This larger length of the raised rib helps ensure a sealing fit between the inner sleeve of the press head and the outer sleeve of the toothed sleeve even when the press head has not fully returned to its original position.
[0011] Preferably, a vertical facet is formed on one of the outer surface of the rib and the inner surface of the outer sleeve. For example, in one embodiment, the vertical facet may be formed on the outer surface of the rib. Of course, the case where the vertical facet is formed on the outer sleeve is also within the scope of this application.
[0012] Preferably, a transition portion is provided between the rib and the rest of the inner sleeve, the outer surface of which has one of the following shapes: a bevel, an arc, or a combination of a bevel and an arc. For example, the rib may include a vertical portion, and a bevel, particularly a long bevel, is formed between the rest of the inner sleeve and the rib as a transition portion. This transition portion guides the resetting movement of the indenter relative to the aligner toward its top dead center, facilitating the return of the indenter to its top dead center.
[0013] Preferably, the outer diameter of the inner sleeve, excluding the rib, is smaller than the inner diameter of the inner sleeve. This way, when the pressure head is pressed down so that the inner surface of the outer sleeve of the dental prosthesis passes over the rib, a gap is formed between the pressure head and the dental prosthesis, allowing air to enter the pump through this gap, thereby balancing the pressure inside and outside the container.
[0014] Specifically, the all-plastic press pump also includes: a cylinder, which is fixedly connected to the toothed sleeve, and a balance air hole is formed on the side wall of the cylinder; a piston rod, one end of which is connected to the press head, and a piston is provided on the other end of the piston rod and extends into the cylinder, with the outer ring of the piston sealingly engaging with the inner surface of the cylinder. The outer ring of the piston includes an upper sealing ring and a lower sealing ring, and the balance air hole is positioned such that when the press head returns to the top dead center of its stroke and when the press head has not fully returned to the top dead center of its stroke, the balance air hole is located between the upper and lower sealing rings.
[0015] This balancing vent design prevents product from leaking into the cylinder through the balancing vent when the container is bumped or placed horizontally.
[0016] Specifically, the position of the balancing air hole is set such that when the pressure head returns to the top dead center of the stroke, the distance between the balancing air hole and the lower sealing ring is less than the distance between the balancing air hole and the upper sealing ring. Attached Figure Description
[0017] The accompanying drawings illustrate a non-limiting preferred embodiment of the present invention. The features and advantages of the present invention become more apparent when viewed in conjunction with the drawings. Specifically:
[0018] Figure 1 A schematic cross-sectional view of the press pump of this application is shown, wherein the press head of the press pump is at the top dead center of its stroke.
[0019] Figure 2 It shows Figure 1 A cross-sectional view of the pressure head of a press pump.
[0020] Figure 3 It shows Figure 1 A cross-sectional view of the toothed fitting of the press pump.
[0021] Figure 4 It shows Figure 1 A magnified view of part I in the image.
[0022] Figure 5 Another cross-sectional view of the press pump of this application is shown, wherein the press head of the press pump is in a state where it has not been fully reset to the top dead center of its stroke.
[0023] Figure 6 It shows Figure 5 A magnified view of part III in the image.
[0024] Figure 7 Another cross-sectional view of the press pump of this application is shown, wherein the press head of the press pump is in the process of being pressed down.
[0025] Figure 8 It shows Figure 7A magnified view of part V in the image, showing a gap between the inner sleeve of the indenter and the outer sleeve of the dental aligner.
[0026] Figure 9 Another cross-sectional view of the press pump of this application is shown, wherein the press head of the press pump is at the bottom dead center of its stroke.
[0027] Figure 10 It shows Figure 1 A magnified view of part II in the image.
[0028] Figure 11 It shows Figure 5 A magnified view of part IV in the image.
[0029] (Symbol Explanation)
[0030] 1. Press pump
[0031] 10 pressure heads
[0032] 11 Inner Sleeve
[0033] 12 convex ribs
[0034] 13 Vertical face
[0035] 14 bevel section
[0036] 20 braces
[0037] 21-inch coat
[0038] 30 cylinders
[0039] 31 cylinder head
[0040] 32-cylinder block
[0041] 33 Balanced pores
[0042] 40 Elastic Reset Mechanism
[0043] 50 piston rod
[0044] 51 Piston
[0045] 52 Upper sealing ring
[0046] 53 Lower sealing ring Detailed Implementation
[0047] The specific embodiments of this utility model will now be described in detail with reference to the accompanying drawings. It should be understood that the embodiments shown in the drawings are merely preferred embodiments of this utility model and do not constitute a limitation on the scope of this utility model. Those skilled in the art can make various obvious modifications, variations, and equivalent substitutions to this utility model based on the embodiments shown in the drawings. Furthermore, without contradiction, the technical features in the different embodiments described below can be arbitrarily combined with each other, all of which fall within the protection scope of this utility model.
[0048] Figure 1 A schematic cross-sectional view of the structure of the press pump 1 of this application is shown. The press pump 1 includes a press head 10 and a toothed sleeve 20, which are engaged together and can move up and down relative to each other. Figure 1 In the diagram, the push pump 1 is in the state where its pressure head 10 has returned to the top dead center. The push pump 1 also includes a cylinder 30, which is fixedly connected to the toothed sleeve 20.
[0049] In the exemplary structure shown in the figure, cylinder 30 includes cylinder head 31 and cylinder body 32. Cylinder head 31 is fixed to the dental brace 20 by means such as snap-fit, and cylinder body 32 is connected below cylinder head 31. Alternatively, in other alternative structures, cylinder 30 may be a single integrally formed component that is fixedly connected to the dental brace 20 at the upper part, and such a structure is also within the scope of this application.
[0050] A piston rod 50 is connected to or provided on the lower inner side of the dental brace 20. One end of the piston rod 50 is connected to the dental brace 20, and the other end is provided with a piston 51 that extends into the internal space of the cylinder 30, and the piston 51 is in a sealing fit with the inner wall of the cylinder 30. Specifically, the piston 51 has an inner ring and an outer ring, and its outer ring is in a sealing fit with the inner wall of the cylinder 30.
[0051] The press pump 1 also includes a resilient reset mechanism 40, which is supported between the press head 10, which is a movable component, and the cylinder 30, which is a fixed component. In this application, the resilient reset mechanism 40 is made of plastic material.
[0052] Figure 2 It shows Figure 1 A schematic cross-sectional view of the pressure head 10 of the press pump 1. An inner sleeve 11 is formed at the lower part of the pressure head 10, and a rib 12 is provided on the inner sleeve 11. In the structure shown, the rib 12 is formed at or near the lower end of the inner sleeve 11. Furthermore, the outer diameter of the rib 12 is set to be larger than the outer diameter of the rest of the inner sleeve 11.
[0053] exist Figure 3 It shows Figure 1A schematic cross-sectional view of the toothed sleeve 20 of the press pump 1. An outer sleeve 21 is formed on the upper part of the toothed sleeve 20. The inner sleeve 11 of the press head 10 can extend into and fit into the outer sleeve 21.
[0054] Figure 4 It shows Figure 1 A magnified view of part I. From Figure 4 As can be seen more clearly, the rib 12 preferably includes a vertical portion 13, wherein, when the pressure head 10 is at its top dead center position, the inner surface of the outer sleeve 21 contacts the outer surface of the rib 12 on the inner sleeve 11. Furthermore, the inner diameter of the outer sleeve 21 is set to be slightly smaller than the outer diameter of the rib 12 portion of the inner sleeve 11, thereby forming an interference fit between the inner surface of the outer sleeve 21 and the outer surface of the rib 12 of the inner sleeve 11, thus forming a seal.
[0055] The axial length of the contact portion between the outer sleeve 21 and the rib 12 is less than the axial length of the rib 12, thus maintaining a sealed fit between the outer sleeve 21 and the rib 12 within a predetermined range of motion of the pressure head 10 relative to the toothed sleeve 20 in the axial direction (i.e., the up-down direction in the figure). In this way, even if the pressure head 10 cannot fully return to its top stop due to insufficient elasticity of the plastic elastic reset mechanism 40, a sealed fit can still be formed between the pressure head 10 and the toothed sleeve 20 to prevent water from entering the press pump 1 and to prevent product leakage to the outside through the gap between the pressure head 10 and the toothed sleeve 20.
[0056] For example, in Figure 5 Another cross-sectional view of the press pump 1 is shown, in which the press head 10 is shown not having returned to its top dead center position, while Figure 6 This shows Figure 5 The enlarged view of Part III shows that even when the pressure head 10 has not returned to its top dead center, the inner surface of the outer sleeve 21 can still engage with the rib 12 on the inner sleeve 11.
[0057] Preferably, the outer diameter of the inner sleeve 11, excluding the rib 12, is smaller than the outer diameter of the rib 12 and also smaller than the inner diameter of the outer sleeve 21. Thus, as... Figure 7 and 8 As shown, when the pressure head 10 is pressed down, causing the outer sleeve 21 of the brace 20 to pass over the vertical face 13 of the rib 12, a gap is formed between the outer sleeve 21 and the inner sleeve 11. Air from outside the pressure pump 1 can flow into the pressure pump 1 through this gap to balance the pressure inside and outside the pressure pump 1. The air flowing into the pressure pump 1 from the outside through the gap... Figure 8 The arrow A is used to represent this symbol.
[0058] Continue pressing down on the pressure head 10 as... Figure 9 As shown, when it reaches the lower limit of its stroke, a gap is always maintained between the outer sleeve 21 and the rib 12 to allow air to pass through.
[0059] Optionally, return Figure 4 The inner sleeve 11 of the indenter 10 is provided with a beveled portion 14, which connects the rib 12 and the other parts of the inner sleeve 11 to form a transition surface between them. During the upward return of the indenter 10 to its top dead center, the beveled portion 14 guides the upward relative movement of the indenter 10 with respect to the dental aligner 20, thereby facilitating the return of the indenter 10 to its top dead center position.
[0060] It should be noted that the vertical facet 13 described above does not necessarily have to be formed on the rib 12 of the inner sleeve 11; it can also be formed on the inner surface of the outer sleeve 21. Furthermore, the axial length of the vertical facet 13 formed on the inner surface of the outer sleeve 21 is greater than the axial length of the contact portion between the vertical facet 13 and the rib 12 of the inner sleeve 11.
[0061] like Figure 10 and 11 As shown more clearly, a balance vent 33 is formed on the side wall of the cylinder 30. For example, this balance vent 33 may be formed on the side wall of the cylinder body 32. The outer ring of the piston 51 includes an upper sealing ring 52 and a lower sealing ring 53, which are in a sealing fit with the inner wall of the cylinder 30. Figure 10 As shown, the position of the balance air hole 33 in the cylinder 30 is selected such that when the pressure head 10 is at its top dead center, the balance air hole 33 is located between the upper sealing ring 52 and the lower sealing ring 53.
[0062] Furthermore, when the pressure head 10 is at its top dead center, the distance between the balance vent 33 and the lower sealing ring 53 is less than the distance between the balance vent 33 and the upper sealing ring 52; that is, the balance vent 33 is closer to the lower sealing ring 53. Thus, even when the pressure head 10 cannot fully return to its top dead center position, the cylinder 30 remains between the upper sealing ring 52 and the lower sealing ring 53. Figure 11 As shown, this prevents the product in the container from entering the cylinder 30 of the press pump 1 through the balancing vent 33 when the container is knocked over or placed horizontally.
[0063] The specific implementation structure of this application has been described in detail above with reference to the accompanying drawings. Those skilled in the art will understand that the structure shown in the figures does not constitute a limitation of this application, and other obvious modifications, variations, and combinations can be made based on the disclosed structure, and these are still within the scope of this application.
[0064] For example, the cylinder 30 shown in the figure includes a cylinder head 31 and a cylinder body 32, while a one-piece cylinder 30 formed integrally is also within the scope of this application.
[0065] The rib 12 is shown in the figure as being formed near the lower end of the inner sleeve 11. Alternatively, the rib 12 can also be provided at other locations on the inner sleeve 11, as long as it is ensured that the outer sleeve 21 engages with the rib 12 when the pressure head 10 is at or near its top dead center.
[0066] The vertical facet 13 can be disposed within the rib 12 or on the inner surface of the outer sleeve 21. Alternatively, other structures and shapes can be formed in the rib 12 as alternatives to the vertical facet 13. For example, a tapered shape can be formed on the outer surface of the rib 12, such as an overall inclined or curved surface, and the outer diameter of a predetermined length of the inclined or curved surface in the axial direction is greater than the inner diameter of the outer sleeve 21, and this predetermined length is greater than the axial length of the portion of the outer sleeve 21 in contact with the rib 12.
[0067] For example, the beveled portion 14 can be replaced by an arc surface. Alternatively, the transition surface between the rib 12 and the rest of the inner sleeve 11 can be a combination of beveled and arc surfaces.
Claims
1. A fully plastic push-button pump, comprising a movable part, a fixed part, and an elastic reset mechanism, wherein the movable part is capable of reciprocating relative to the fixed part along the axial direction of the pump, the elastic reset mechanism is made of plastic material and supported between the movable part and the fixed part, the movable part includes a pressure head, an inner sleeve is formed below the pressure head, the fixed part includes a toothed sleeve, an outer sleeve is formed on the upper part of the toothed sleeve, and the inner sleeve is capable of fitting into the outer sleeve, characterized in that... A raised rib is formed on the inner sleeve. The outer diameter of the raised rib is larger than the inner diameter of the outer sleeve and also larger than the outer diameter of the other parts of the inner sleeve except for the raised rib. The raised rib is configured to form a sealing fit between the inner surface of the outer sleeve of the dental aligner and the outer surface of the raised rib when the pressure head is reset to the top dead center of the stroke and when the pressure head is not fully reset to the top dead center of the stroke.
2. The all-plastic push-pump as described in claim 1, characterized in that, The rib is formed at the lower end of the inner sleeve.
3. The all-plastic push-pump as described in claim 1, characterized in that, In the axial direction of the all-plastic press pump, the length of the rib is greater than the length of the contact portion between the outer sleeve and the rib.
4. The all-plastic push-pump as described in claim 1, characterized in that, A vertical facet is formed on one of the outer surface of the rib and the inner surface of the outer sleeve.
5. The all-plastic push-pump as described in claim 1, characterized in that, A transition portion is provided between the rib and other parts of the inner sleeve, and the outer surface of the transition portion has one of the following shapes: a slope, an arc surface, and a combination of a slope and an arc surface.
6. The all-plastic push-pump as described in claim 1, characterized in that, The outer diameter of the portion of the inner sleeve other than the rib is smaller than the inner diameter of the inner sleeve.
7. The all-plastic push-pump as described in any one of claims 1 to 6, characterized in that, The fixing part also includes a cylinder, which is fixedly connected to the dental brace, and a balance air hole is formed on the side wall of the cylinder; The movable part also includes a piston rod, one end of which is connected to the pressure head, and the other end of which is provided with a piston that extends into the cylinder. The outer ring of the piston is sealed to the inner surface of the cylinder. The piston's outer ring includes an upper sealing ring and a lower sealing ring, and the balance vent is positioned such that when the pressure head returns to the top dead center of the stroke and when the pressure head has not fully returned to the top dead center of the stroke, the balance vent is located between the upper sealing ring and the lower sealing ring.
8. The all-plastic push-pump as described in claim 7, characterized in that, The position of the balancing air hole is set such that when the pressure head returns to the top dead center of the stroke, the distance between the balancing air hole and the lower sealing ring is less than the distance between the balancing air hole and the upper sealing ring.