Plastic elastic reset mechanism and pressing pump comprising same

Abstract

A plastic elastic reset mechanism is used in a pressing pump and comprises at least one elastic strip. The elastic strip comprises an interface, the interface divides the elastic strip into an inner side part and an outer side part, when the elastic strip is pressed and deformed, the inner side part is subjected to extrusion force, the outer side part is subjected to drawing force, and the acting force borne by the elastic strip at the interface is zero. And in the same cross section of the elastic strip, the cross section area of one side of the inner side part is smaller than that of one side of the outer side part. The structure of the plastic elastic reset mechanism can reduce the pressing force required by downward pressing, and meanwhile, the plastic elastic reset mechanism rebounds quickly and can ensure that the plastic elastic reset mechanism rebounds in place. The invention further relates to a pressing pump comprising the plastic elastic reset mechanism.

Description

Technical Field

[0001] The present application relates to a product dispensing device, which is used for dispensing liquid or semi-liquid products from a container. The product dispensing device is particularly a fully plastic press pump, and the present application specifically relates to an improvement on a plastic elastic reset mechanism of the press pump. Background Art

[0002] Press pumps are widely used in the packaging of liquid or semi-liquid products in fields such as daily chemical products, food, and medicine. With the continuous improvement of environmental protection requirements, higher environmental protection requirements are also put forward for product packaging. These packaging materials should at least meet at least one of the requirements of reusability, recyclability, and degradability. Among these packages, the most difficult part to recycle is the press pump, because the press pump includes a metal spring, which is used to restore the press pump to its standby position after dispensing the product. However, due to the presence of the metal spring, the metal spring needs to be removed when recycling the press pump, which increases the difficulty of recycling the press pump.

[0003] In order to meet environmental protection requirements, some companies have begun to try to produce all-plastic pumps, using plastic elastic reset mechanisms (plastic springs) to replace metal springs. In this way, all parts of the pump can be made of plastic, so that the pump can be easily recycled as a whole. However, the technology of existing all-plastic pumps is still immature, mainly because the elastic force of the plastic elastic reset mechanism used is difficult to meet the use requirements. Specifically, the pressing force to be applied when pumping the product is larger than that of the metal spring, and the rebound force of the elastic reset mechanism after the pressing force is removed is smaller. Therefore, the existing all-plastic pumps have the problem of heavy pressing feel, slow reset, and even incomplete rebound.

[0004] Therefore, in the field of all-plastic press pumps, there is a need to further improve the structure of the elastic reset mechanism in the press pump, in order to solve the problems of high pressing force and rebound in the existing press pumps mentioned above. Summary of the invention

[0005] This application is made to solve the problems existing in the prior art mentioned above. The purpose of this application is to provide an improved plastic elastic reset mechanism for a fully plastic press pump, which can be pressed down and deformed under a relatively small pressure and has better resilience.

[0006] The present application provides a plastic elastic reset mechanism, which is used in a press pump. The plastic elastic reset mechanism includes at least one elastic strip, and the elastic strip includes a dividing interface, which divides the elastic strip into an inner part and an outer part, wherein when the elastic strip is deformed by pressure, the inner part is subjected to an extrusion force, the outer part is subjected to a tensile force, and the force applied to the elastic strip at the dividing interface is zero. The elastic strip is configured such that, in the same cross section of the elastic strip, the cross-sectional area of ​​one side of the inner part is smaller than the cross-sectional area of ​​one side of the outer part.

[0007] When the plastic elastic reset mechanism is deformed by pressure, the inner part thereof is subjected to an extrusion force, which is the main force that makes the user feel heavy when pressing, while the tensile force on the outer part helps to generate the rebound force required for reset. Therefore, by making the cross-sectional area of ​​one side of the inner part smaller than the cross-sectional area of ​​one side of the outer part, it helps to reduce the extrusion force generated in the plastic elastic reset mechanism when pressing downward, thereby reducing the required pressing force. On the other hand, the increase in the cross-sectional area of ​​the outer part helps to generate the rebound force required for rebound. In this way, the structure of the plastic elastic reset mechanism can reduce the pressing force required for downward pressing, and at the same time, the plastic elastic reset mechanism rebounds quickly and can ensure that it rebounds in place.

[0008] Preferably, the cross-sectional area of ​​the middle portion of the elastic strip is the largest, and the cross-sectional area of ​​the elastic strip decreases toward both ends of the elastic strip.

[0009] In this way, the elastic strip is formed into a shape that is wide in the middle and narrow at both ends, which makes the elastic strip easier to deform, can reduce the resistance pressure generated by the elastic strip during pressing, and thus improve the problem of heavy hand feeling for users.

[0010] In an exemplary configuration, in a relaxed state, when viewed from the front of the elastic strip, the elastic strip is arcuate. Additionally or alternatively, in a relaxed state, when viewed from the side of the elastic strip, the elastic strip is arcuate.

[0011] Preferably, the elastic reset mechanism includes at least one connecting ring and a plurality of elastic strips, wherein one end of the elastic strip is connected to the connecting ring, so that the plurality of elastic strips are connected together through the connecting ring. For example, it may include two upper and lower connecting rings, wherein the upper ends of the plurality of elastic strips are connected to the upper connecting ring, and the lower ends are connected to the lower connecting ring.

[0012] Preferably, a groove is provided in the elastic strip, and at least one connecting rib is provided in the groove, and the connecting rib extends from the inner boundary of the groove to the outer boundary of the groove, wherein the inner boundary of the groove is close to or located in the inner part, and the outer boundary of the groove is close to or located in the outer part. The structure of the groove and the connecting rib can further help reduce the pressure resistance generated when the plastic elastic reset mechanism is compressed and increase the resilience.

[0013] Preferably, a plurality of connecting ribs are arranged in the groove.

[0014] The cross-sectional shape of the elastic strip can be set according to actual needs. For example, the cross-sectional shape of the elastic strip is selected from the following shapes: circular, elliptical, rectangular, polygonal, or a combination of at least two of these shapes.

[0015] The present application also relates to a pressing pump, which includes a movable part and a fixed part, wherein the pressing pump includes a plastic elastic reset mechanism as above, one end of the plastic elastic reset mechanism is supported on the movable part, and the other end is supported on the fixed part.

[0016] In a further specific structure, the movable part includes a pressure head and a piston rod connected to the lower part of the pressure head, and the fixed part includes a toothed sleeve and a cylinder fixedly connected together, and a piston is provided at the lower end of the piston rod and extends into the cylinder, and the piston is sealed with the inner wall of the cylinder. Among them, one end of the elastic reset mechanism is supported on the pressure head or the piston rod, and the other end of the elastic reset mechanism is supported on the toothed sleeve or the cylinder. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The accompanying drawings show non-limiting preferred implementation structures of the present application, and the features and advantages of the present application can be more clearly seen in conjunction with the accompanying drawings.

[0018] Figure 1 A schematic cross-sectional view of a compression pump of the present application is shown.

[0019] Figure 2a Shows Figure 1 A three-dimensional view of the elastic return mechanism of the first embodiment of the pressing pump.

[0020] Figure 2b Shows Figure 2a Front view of the elastic reset mechanism.

[0021] Figure 2c Shown along Figure 2b A side view of the elastic reset mechanism as seen from the direction indicated by arrow B.

[0022] Figure 3-Figure 12 Shown along Figure 2c Various exemplary cross-sectional shapes of the elastic strip of the elastic reset mechanism obtained by line AA in FIG.

[0023] Fig.13a A three-dimensional view of an elastic strip of an elastic reset mechanism according to a second embodiment of the present application is shown.

[0024] Fig.13b Shown along Fig.13a A cross-sectional view of the elastic strip obtained along line CC in FIG.

[0025] (Explanation of symbols)

[0026] 1 Press the pump

[0027] 10 pressure head

[0028] 20 braces

[0029] 30 cylinders

[0030] 40 piston rod

[0031] 41 Piston

[0032] 50 Elastic reset mechanism

[0033] 51 elastic strips

[0034] 52 connection ring

[0035] 53 limit part

[0036] 54 inner part

[0037] 55 Outer part

[0038] 56 grooves

[0039] 57 Connecting ribs

[0040] L dividing line DETAILED DESCRIPTION

[0041] The specific implementation of the present invention will be described in detail below in conjunction with the accompanying drawings. It should be understood that the drawings only show preferred embodiments of the present invention, which do not constitute a limitation on the scope of the present invention. Those skilled in the art can make various obvious modifications, variations, and equivalent substitutions to the present invention based on the embodiments shown in the drawings, and the technical features of the different embodiments described below can be arbitrarily combined with each other without contradiction, which all fall within the scope of protection of the present invention.

[0042] <First Embodiment>

[0043] Figure 1 The exemplary structures of the pressing pump 1 and its elastic restoring mechanism 50 according to the first embodiment of the present application, as well as various variations of the elastic restoring mechanism 50 are shown.

[0044] Figure 1 2 is a cross-sectional view showing a schematic structure of a pressing pump 1 of the present application. The pressing pump 1 includes a pressing head 10, a toothed sleeve 20 and a cylinder 30. The toothed sleeve 20 is fixedly connected to the cylinder 30, and a piston rod 40 is connected to the lower part of the pressing head 10, wherein the upper end of the piston rod 40 is connected to the pressing head 10, and a piston 41 is provided on the lower end of the piston rod 40 and extends into the interior of the cylinder 30. A sealing fit is formed between the outer ring of the piston 41 and the inner surface of the cylinder 30.

[0045] The ram 10 and the piston rod 40 are the movable parts of the press pump 1, and the mouthpiece 20 and the cylinder 30 are the fixed parts of the press pump 1. The ram 10 and the piston rod 40 can reciprocate in the up and down directions relative to the mouthpiece 20 and the cylinder 30. As the ram 10 and the piston rod 40 reciprocate relative to the mouthpiece 20 and the cylinder 30, the product contained in the cylinder 30 can be dispensed through the channel in the piston rod 40 and the pressure nozzle of the ram 10 that are interconnected.

[0046] The pressing pump 1 further includes an elastic reset mechanism 50, which is supported between a movable part and a fixed part of the pressing pump 1. For example, the upper end of the elastic reset mechanism 50 is supported on the pressing head 10 or the piston rod 40, and the lower end of the elastic reset mechanism 50 is supported on the mouthpiece 20 or the cylinder 30. When the user removes the pressing force applied to the pressing head 10 after the product is pumped, the elastic reset mechanism 50 can move the pressing head 10 and the piston rod 40 upward to restore to their standby position, waiting for the next pumping.

[0047] In the present application, the elastic reset mechanism 50 is made of plastic, and thus is a plastic elastic reset mechanism. The elastic reset mechanism 50 includes at least one, and preferably a plurality of, elastic strips 51. When the pressure head 10 is pressed downward, the elastic strip 51 will be deformed by pressure, for example, it will bend under pressure and the curvature will become larger. In this process, a rebound force is accumulated in the elastic strip 51. When the user removes the pressing force, the rebound force in the elastic strip 51 will cause the pressure head 10 and the piston rod 40 to rebound upward.

[0048] Figure 2a-2c 3D, front and side views of the elastic reset mechanism 50 are shown respectively, wherein the elastic reset mechanism 50 is in its unstressed state. It can be seen that, preferably, in the unstressed state, when viewed from the front of the elastic reset mechanism 50, the elastic reset mechanism 50 is in an arch shape, such as Figure 2b As shown. Further preferably, as Figure 2c As shown, when viewed from the side of the elastic restoring mechanism 50 , the elastic restoring mechanism 50 is also in an arcuate shape.

[0049] In the exemplary structure shown in the figure, the elastic reset mechanism 50 is a double-layer spring structure, which includes a first group of elastic strips 51 located at the top and a second group of elastic strips 51 located at the bottom. The elastic reset mechanism 50 preferably also includes a plurality of connecting rings 52, and the ends of each elastic strip 51 are connected to the connecting rings 52, so that the elastic strips 51 can be connected together.

[0050] Of course, the elastic reset mechanism 50 in the pressing pump 1 of the present application can also be a single-layer spring structure. In addition, the connecting ring 52 is also an optional structure, and the two ends of the elastic strip 51 can be directly supported or connected to the movable part and the fixed part of the pressing pump 1 respectively.

[0051] Preferably, the elastic reset mechanism 50 may also include a limiting portion 53, and the pressing pump 1 limits the deformation degree of the elastic strip 51 when the elastic reset mechanism 50 is pressed. In the exemplary structure shown in the figure, the limiting portion 53 is a slender rod extending from the connecting ring 52, one end of which is connected to the connecting ring 52 and the other end is a free end. As the elastic reset mechanism 50 is compressed and deformed, the distance between the two connecting rings 52 at both ends of the elastic strip 51 is reduced until the free end of the limiting portion 53 contacts the connecting ring 52 arranged opposite thereto, and further deformation of the elastic reset mechanism 50 will be prevented.

[0052] The applicant has analyzed the stress conditions of the elastic strip 51 when it is deformed under pressure. When the elastic reset mechanism 50 is pressed, one side of the arcuate elastic strip 51 will be subjected to the tensile force, while the other side opposite thereto will be subjected to the extrusion force.

[0053] Here, the side of the elastic strip 51 subjected to the tensile force is referred to as the outer side, and the side of the elastic strip 51 subjected to the extrusion force is referred to as the inner side. Figure 3 By analyzing the cross-section of the elastic strip 51 shown, it can be seen that the tensile force on the outermost side of the elastic strip 51 is the largest, and the tensile force will gradually decrease in the direction toward the inside until it becomes zero. Then, as it continues in the inward direction, the force on the elastic strip 51 becomes an extrusion force, and the extrusion force gradually increases toward the inside. At the innermost side of the elastic strip 51, the extrusion force is the largest.

[0054] Therefore, from the cross section of the elastic strip 51, there is a dividing line L in the elastic strip 51, such as Figure 3 Schematically indicated by a dotted line in FIG. At the dividing line L, the force applied to the elastic strip 51 is zero, or the deformation of the elastic strip 51 at the dividing line L is zero. The dividing surface formed by the dividing line L of the continuous cross section of the elastic strip 51 divides the elastic strip 51 into two parts, namely, the inner part 54 and the outer part 55. When the elastic strip 51 is compressed and deformed, the inner part 54 is subjected to an extrusion force, and the outer part 55 is subjected to a tensile force.

[0055] In response to the different forces, different reaction forces are generated in the inner part 54 and the outer part 55. A resistive force is generated in the inner part 54 of the elastic strip 51, which makes the user feel heavy during the pressing process. In response to the tensile force, a rebound force is generated in the outer part 55, which can restore the elastic reset mechanism 50 to its original state after the pressing force is removed, thereby helping the pressure head 10 and the piston rod 40 to rebound to their original positions.

[0056] In the present application, the dividing line L in the cross section of the elastic strip 51 is set so that in the same cross section, the cross-sectional area of ​​the inner portion 54 is smaller than the cross-sectional area of ​​the outer portion 55, as shown in FIG. Figure 3 As shown in . Thus, the cross-sectional area of ​​the inner part 54 is small, which means that the volume of the plastic material of the inner part 54 is also relatively small. Thus, when the elastic reset mechanism 50 is pressed, the resistance pressure generated in the inner part 54 can be reduced, so that the user does not feel so heavy when pressing. In contrast, the cross-sectional area of ​​the outer part 55 is large, and the rebound force generated by its stretching is also large, which helps the pressure head 10 and the piston rod 40 to rebound to their original positions after the pressing force is removed.

[0057] The position of the dividing line L in the cross section of the elastic strip 51 can be set in a variety of ways, such as by appropriately selecting the shape of the cross section of the elastic strip 51, by setting the curvature of the bow-shaped elastic strip 51 when it is not under stress, by setting the connection points between the two ends of the elastic strip 51 and the connecting ring 52, and so on.

[0058] In the schematic structure shown in the figure, the elastic strip 51 is configured such that the cross-sectional area of ​​the longitudinal middle portion is the largest, and the cross-sectional area decreases toward the two ends of the elastic strip 51. In other words, the elastic strip 51 is formed into a shape that is wide in the middle and narrow at both ends. Such a structure can make the elastic strip 51 easier to deform, thereby reducing the resistance pressure generated by the elastic strip 51 during the pressing process, thereby improving the problem of the user's heavy hand feeling.

[0059] Furthermore, the cross-sectional shape of the elastic strip 51 can be selected from a variety of different geometric shapes, such as a rectangle, an ellipse, a circle, an I-shape, or a combination of two or more shapes. Figure 3-12 Various exemplary cross-sectional shapes of the elastic strip 51 are shown.

[0060] <Second Embodiment>

[0061] Figure 13a-13bThe exemplary structure of the elastic strip 51 of the elastic reset mechanism 50 in the second embodiment of the present application is shown. In the second embodiment, the structure of other parts of the pressing pump 1 can be the same as that of the first embodiment, and will not be described in detail here.

[0062] Figure 13a-13b An alternative configuration of the elastic strip 51 of the elastic reset mechanism 50 is shown. Figure 13a-13b In the elastic strip 51 shown, a groove 56 is provided in the outer portion 55 of the elastic strip 51. For example, the groove 56 can pass through the elastic strip 51 to form a through groove. At least one, preferably a plurality of connecting ribs 57 are provided in the groove 56. These connecting ribs 57 extend from the inner boundary of the groove 56 to the outer boundary of the groove 56. The inner boundary of the groove 56 refers to the boundary of the groove 56 close to the inner portion 54 of the elastic strip 51 or located in the inner portion 54, and the outer boundary of the groove 56 refers to the boundary of the groove 56 close to the outer portion 55 of the elastic strip 51 or located in the outer portion 55. Thus, Figure 13a-13b The elastic strip 51 forms a hollow structure. The hollow structure of the elastic strip 51 helps to increase the resilience generated by the elastic strip 51 when it is bent and deformed.

[0063] On the other hand, the above-mentioned groove 56 and connecting rib 57 structure can also be formed in the inner part 54 of the elastic strip 51, that is, the inner part 54 is formed as a hollow structure, which helps to reduce the anti-pressure generated in the inner part 54 when it is pressed and deformed.

[0064] The exemplary structure of the compression pump of the present application is described in detail above. Those skilled in the art will appreciate that various obvious modifications, variations, and recombinations can be made based on the above disclosed content, and these are also within the scope of the present application.

Claims

1. A plastic elastic reset mechanism, the plastic elastic reset mechanism is used in a press pump, the plastic elastic reset mechanism comprises at least one elastic strip, the elastic strip comprises a dividing interface, the dividing interface divides the elastic strip into an inner part and an outer part, wherein: When the elastic strip is deformed by pressure, the inner part is subjected to an extrusion force, the outer part is subjected to a tensile force, and the force applied to the elastic strip at the interface is zero. The feature of the present invention is that the elastic strip is arranged so that, in the same cross section of the elastic strip, the cross-sectional area of ​​the inner part is smaller than the cross-sectional area of ​​the outer part.

2. The plastic elastic reset mechanism according to claim 1, characterized in that: The cross-sectional area of ​​the middle portion of the elastic strip is the largest, and the cross-sectional area of ​​the elastic strip decreases along the direction toward the two ends of the elastic strip.

3. The plastic elastic reset mechanism according to claim 1, characterized in that: In a relaxed state, the elastic strip is arcuate when viewed from the front of the elastic strip; and / or In a relaxed state, the elastic strip is arcuate when viewed from the side of the elastic strip.

4. The plastic elastic reset mechanism according to claim 1, characterized in that: The elastic reset mechanism includes at least one connecting ring and a plurality of the elastic strips, wherein one end of the elastic strip is connected to the connecting ring, so that the plurality of the elastic strips are connected together through the connecting ring.

5. The plastic elastic reset mechanism according to claim 1, characterized in that: A groove is provided in the elastic strip, and at least one connecting rib is provided in the groove, wherein the connecting rib extends from the inner boundary of the groove to the outer boundary of the groove, wherein the inner boundary of the groove is close to the inner part or located in the inner part, and the outer boundary of the groove is close to the outer part or located in the outer part.

6. The plastic elastic reset mechanism according to claim 5, characterized in that: A plurality of connecting ribs are arranged in the groove.

7. The plastic elastic reset mechanism according to claim 1, characterized in that: The cross-sectional shape of the elastic strip is selected from the following shapes: circular, elliptical, rectangular, polygonal, or a combination of at least two of these shapes.

8. A compression pump, comprising a movable part and a fixed part, characterized in that: The pressing pump comprises a plastic elastic reset mechanism as claimed in any one of claims 1 to 7, one end of the plastic elastic reset mechanism is supported on the movable part, and the other end is supported on the fixed part.

9. The pressing pump according to claim 8, characterized in that: The movable part includes a pressure head and a piston rod connected to the lower part of the pressure head, and the fixed part includes a toothed sleeve and a cylinder fixedly connected together. A piston is provided at the lower end of the piston rod and extends into the interior of the cylinder. The piston is sealed and matched with the inner wall of the cylinder. One end of the plastic elastic reset mechanism is supported on the pressure head or the piston rod, and the other end of the plastic elastic reset mechanism is supported on the tooth sleeve or the cylinder.

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