Spring set, and press pump comprising same

Abstract

A spring set for a press pump, and a press pump comprising a spring set. The spring set comprises at least two elastic layers including a first elastic layer and a second elastic layer, wherein the first elastic layer comprises at least one arcuate first elastic strip, and the second elastic layer comprises at least one arcuate second elastic strip; the first elastic strip has a first upper end and a first lower end, and the second elastic strip has a second upper end and a second lower end; and the first elastic strip and the second elastic strip are configured such that, when the spring set is pressed, the direction of the resultant force of the elastic force of the first elastic strip is in a straight line with the direction of the resultant force of the elastic force of the second elastic strip. The structure of the spring set is conducive to improving the overall elastic force of the spring set.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of product dispensing devices, and in particular, to a press pump for pumping a product out of a product container, and especially, to a design of a structure of a return spring in the press pump.BACKGROUND

[0002] In fields such as daily chemicals, pharmaceuticals, and food, a press pump is widely used as a product dispensing device to dispense a product out of a container for use by consumers. A return spring is usually provided in the press pump, and the return spring resets the press pump after being pressed to pump out the product, so as to be ready for the next use.

[0003] Springs used in conventional press pumps are metal springs, such as stainless steel springs. However, since the other parts of the press pump are made of plastic, when the press pump needs to be recycled and reused after the product in the container is completely used, the spring made of metal needs to be disassembled from the other parts of the press pump, which leads to problems such as a low recycling efficiency of the press pump.

[0004] In order to improve the recycling rate of press pumps, attempts have been made in the industry to replace metal springs with plastic springs. However, the existing press pumps with plastic springs have been found to present some of the following problems during use. First, a plastic spring has a lower elastic force than a metal spring, and is prone to a phenomenon in which the press pump fails to fully reset, and a user is required to apply a larger force during pressing, and the amount of the product pumped out per pressing is relatively small. Second, a larger deformation space is required by the plastic spring, and thus the press pump using the plastic spring generally has a relatively large volume, but the efficiency of converting its deformation into a resilience force is relatively low. Moreover, the plastic spring is prone to yielding deformation after being subjected to a pressing force for a long time, thereby further weakening the resilience force of the plastic spring and even causing the plastic spring to fail. Therefore, a plastic spring can withstand fewer pressing cycles than a metal spring.

[0005] Therefore, there is a need in the art for further improving a press pump, and especially a spring structure in the press pump, which can allow a spring to be made of plastic while overcoming technical problems existing in the existing plastic springs, such as a large volume, a low resilience force conversion efficiency, and reduced pressing cycles.SUMMARY

[0006] The present application is provided to solve the above problems existing in the prior art. An object of the present application is to provide a spring set with an improved structure, which can be made of plastic, and also can overcome the above technical problems existing in plastic springs of the prior art.

[0007] The present application provides a spring set for a press pump, the spring set including at least two elastic layers, the at least two elastic layers including a first elastic layer and a second elastic layer, the first elastic layer including at least one arcuate first elastic strip, the second elastic layer including at least one arcuate second elastic strip, the first elastic strip having a first upper end and a first lower end, and the second elastic strip having a second upper end and a second lower end. The first elastic strip and the second elastic strip are configured such that, when the spring set is pressed, a direction of a resultant force of an elastic force of the first elastic strip is in a straight line with a direction of a resultant force of an elastic force of the second elastic strip.

[0008] With the spring set with such a structure, and especially the configuration of the first and second elastic strips as described above, the elastic forces of the corresponding elastic strips in the first elastic layer and the second elastic layer can be effectively superimposed, improving the efficiency of converting the deformation of the elastic strip into the elastic force and thus improving the overall elastic force of the spring set. In this way, the spring set can generate a sufficient elastic force even when made of plastic.

[0009] In a preferred structure, the first lower end of the first elastic strip and the second upper end of the corresponding second elastic strip are aligned with each other or directly connected to each other. As a result, the directions of the resultant forces of the elastic forces of the respective elastic strips in the first elastic layer and the second elastic layer are in the straight line, so as to facilitate the effective superimposition of the elastic forces.

[0010] Further preferably, the first upper end and the first lower end of the first elastic strip and the second upper end and the second lower end of the corresponding second elastic strip are arranged in the straight line.

[0011] More preferably, the straight line is parallel to an axis of the spring set. In this way, the elastic force of the first elastic strip in the first elastic layer and the elastic force of the second elastic strip in the second elastic layer can both be effectively superimposed, reducing or substantially eliminating force components that would counteract each other.

[0012] Preferably, the spring set includes an upper fixing portion located at a top of the spring set and a lower fixing portion located at a bottom of the spring set.

[0013] Further, the spring set can further include at least one intermediate fixing portion arranged between two adjacent elastic layers of the at least two elastic layers.

[0014] In addition to the arrangement where the corresponding first elastic strip and second elastic strip are aligned with each other, the first elastic strip and the second elastic strip may be arranged such that the first lower end of the first elastic strip and the second upper end of the corresponding second elastic strip abut against the intermediate fixing portion and are arranged in a staggered manner.

[0015] A piston rod hole is formed in each of the upper fixing portion, the lower fixing portion and the intermediate fixing portion for a piston rod of the press pump to pass through, where at least one of the first elastic strip and the second elastic strip is close to the piston rod hole. In this way, a larger deformation space can be provided for the elastic strip.

[0016] Alternatively, a piston rod hole is formed in each of the upper fixing portion, the lower fixing portion and the intermediate fixing portion for a piston rod of the press pump to pass through, where a projection of at least one of the first elastic strip and the second elastic strip on a plane perpendicular to an axis of the spring set has a curved shape, is close to the piston rod hole, and extends around the piston rod hole. Such a structure is also conducive to providing a larger deformation space for the elastic strip.

[0017] The upper fixing portion, the lower fixing portion and the intermediate fixing portion are formed in one or a combination of a circular shape, an elliptical shape, and a polygonal shape.

[0018] Preferably, a hinge connection portion is provided on at least one of the first upper end, the first lower end, the second upper end and the second lower end.

[0019] Preferably, at least one of the at least two elastic layers includes a limit mechanism for limiting a maximum deformation of the spring set. In this way, the risk of yielding of the spring set caused by excessive deformation can be reduced.

[0020] A specific implementation structure of the limit mechanism includes at least one limit support rod, the limit support rod having one end fixedly connected to an intermediate fixing portion between two adjacent elastic layers, and the other end as a free end.

[0021] The present application relates to another spring set for a press pump, the spring set including at least two elastic layers, the at least two elastic layers including a first elastic layer and a second elastic layer, the first elastic layer including at least one first elastic strip, and the second elastic layer including at least one second elastic strip. At least one of the at least two elastic layers includes a limit mechanism, the limit mechanism defining a minimum height of the elastic layer corresponding to the limit mechanism when being compressed and deformed.

[0022] By defining the minimum height of the elastic layer when being compressed, that is, limiting a maximum deformation of the corresponding elastic layer, the limit mechanism can reduce the risk of yielding deformation of the spring set under compression.

[0023] The limit mechanism can include at least one limit support rod, the limit support rod having one end as a fixed end fixedly connected to the corresponding elastic layer, for example, to an intermediate fixing portion between two elastic layers, or to an elastic strip, and the other end as a free end.

[0024] Further disclosed is a press pump, including a movable part and a fixed part. The press pump includes a spring set as described above, a top of the spring set is supported on the movable part, and a bottom of the spring set is supported on the fixed part.

[0025] Specifically, the fixed part includes a press head and a piston rod connected to a lower portion of the press head, and the fixed part includes a threaded collar and a cylinder fixedly connected together, the piston rod extending into the cylinder.

[0026] Preferably, a piston rod hole is formed in each of the upper fixing portion, the lower fixing portion and the intermediate fixing portion of the spring set, a slot is formed in the piston rod hole, a rib is formed on an outer surface of the piston rod, and a shape of the rib matches a shape of the slot. With the fit between the slot and the rib, a relative position between the spring set and the piston rod can be fixed, avoiding a relative rotation between the spring set and the piston rod.

[0027] Further, the spring set can be arranged inside a pump body of the press pump, for example, accommodated in the cylinder. Of course, the spring set can also be arranged outside the pump body, for example, arranged outside and surrounding the cylinder.BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Non-limiting preferred implementation structures of the present invention are illustrated in the accompanying drawings, and the features and advantages of the present invention will become more apparent with reference to the accompanying drawings, in which: FIG. 1 shows a cross-sectional view of a press pump having a spring set of the present application. FIG. 2a shows a perspective view of the spring set of a first embodiment of the press pump of FIG. 1. FIG. 2b shows a front view of the spring set of the first embodiment. FIG. 2c shows a cross-sectional view of the spring set taken along line A-A in FIG. 2b. FIG. 3a shows a perspective view of a spring set of a second embodiment. FIG. 3b shows a front view of the spring set of the second embodiment. FIG. 3c shows a cross-sectional view of the spring set taken along line B-B in FIG. 3b. FIG. 4a shows a perspective view of a spring set of a third embodiment. FIG. 4b shows a front view of the spring set of the third embodiment. FIG. 4c shows a side view of the spring set of the third embodiment. FIG. 5 shows a perspective view of a press pump of a fourth embodiment, where a spring set of the press pump is arranged outside a cylinder. FIG. 6 shows a perspective view of the spring set of the press pump of FIG. 5. FIGS. 7a to 7o show perspective views of some alternatively structured spring sets with a limit mechanism, where the spring set includes an intermediate fixing portion, and one end of the limit mechanism is fixedly connected to the intermediate fixing portion. FIGS. 8a to 8j show perspective views of other alternatively structured spring sets with a limit mechanism, where one end of the limit mechanism is fixedly connected to an elastic strip in a corresponding spring layer. (List of reference signs)

[0029] 10press pump 11press head 12threaded collar 13cylinder 14spring support portion 15piston rod 16rib 17piston 18through slot 19protrusion 20spring set 21upper fixing portion 22lower fixing portion 23intermediate fixing portion 24, 24'piston rod hole 25slot 31, 31'first elastic strip 32, 32'second elastic strip 33first upper end 34first lower end 35second upper end 36second lower end 37hinge connection portion 38limit support rod DETAILED DESCRIPTION OF EMBODIMENTS

[0030] Particular embodiments of the present invention are described below in detail with reference to the accompanying drawings. It should be understood that only preferred embodiments of the present invention are shown in the accompanying drawings and are not intended to constitute a limitation to the scope of the present invention. Various obvious modifications, variations and equivalent substitutions of the present invention can be made by those skilled in the art on the basis of the embodiments shown in the drawings, and the technical features in the various embodiments described below can be arbitrarily combined with each other without causing contradictions. These all fall within the scope of protection of the present invention.

[0031] In the following specific descriptions, orientational terms used such as "upper" and "lower" are based on an orientation of a press pump and a spring set thereof shown in the drawings for convenience of description. This orientation is also substantially an orientation adopted when the press pump is normally operated, and in other situations, for example, in situations such as transportation and storage of a product, the orientation of the press pump may change.<First Embodiment>

[0032] FIGS. 1 to 2b show a first embodiment of the present application. FIG. 1 shows a cross-sectional view of a press pump 10 of the present application. The press pump 10 includes a press head 11, a threaded collar 12, a cylinder 13, and a piston rod 15. The piston rod 15 is connected to a lower portion of the press head 11, and extends downward into the cylinder 13. The threaded collar 12 and the cylinder 13 are fixedly connected together, and the press head 11 is arranged to be movable in a vertical direction relative to the threaded collar 12 and the cylinder 13.

[0033] A piston 17 is provided on the piston rod 15, and the piston 17 is sealed against an inner wall of the cylinder 13, and is movable in the vertical direction relative to the inner wall of the cylinder 13. Here, the piston rod 15 may be integrally formed at the lower portion of the press head 11, or may be separately formed and then connected to the lower portion of the press head 11, which all fall within the scope of the present application.

[0034] Optionally, the press pump 10 may further include a spring support portion 14 fixedly mounted on the inner wall of the cylinder 13. It will be apparent to those skilled in the art that the spring support portion 14 may be of a structure integrally formed on the cylinder 13, or may be separately formed and mounted in the cylinder 13.

[0035] When the press head 11 is pressed downward, the press head 11 and the piston rod 15 connected to the lower portion of the press head 11 move together relative to the threaded collar 12 and the cylinder 13, so as to drive the piston 17 on the cylinder 13 to move downward while remaining sealed against the inner wall of the cylinder 13, such that a volume of the cylinder 13 is reduced, a product pressure in the cylinder 13 is increased, and under the action of the increased pressure, a product is pumped out. As can be seen, in the press pump 10 shown in the figure, the press head 11 and the piston rod 15 each are a movable part, and the threaded collar 12 and the cylinder 13 each are a fixed part.

[0036] As shown in FIG. 1, the press pump 10 further includes an elastic return mechanism, and particularly a spring set 20 shown in the figure. An upper end of the spring set 20 is supported on the press head 11, and a lower end thereof is supported on the spring support portion 14. When the press head 11 moves downward relative to the fixed part of the press pump 10 including the threaded collar 12 and the cylinder 13, the spring set 20 is compressed, accumulating a resilience force therein, and after a pressing force applied to the press head 11 is removed, the resilience force causes the press head 11 to recover to its upper standby state.

[0037] FIGS. 2a to 2c show respective views of the spring set 20 of the press pump 10 of FIG. 1. FIG. 2a shows a perspective view, FIG. 2b shows a front view, and FIG. 2c shows a cross-sectional view taken along line A-A in FIG. 2b.

[0038] The spring set 20 of the present application may be made of plastic, and has a multi-layer structure including at least two layers. In the structure shown in the figures, the spring set 20 includes a first elastic layer located at an upper portion thereof, and the first elastic layer includes at least one first elastic strip 31. The spring set 20 further includes a second elastic layer located at a lower portion thereof, and the second elastic layer includes at least one second elastic strip 32. As shown in FIG. 2b, the first elastic strip 31 in the first elastic layer and the second elastic strip 32 in the second elastic layer are specifically arcuate elastic strips. Specifically, the first elastic strip 31 has a first upper end 33 and a first lower end 34, and the second elastic strip 32 has a second upper end 35 and a second lower end 36. In the present application, the first elastic strip 31 in the first elastic layer and the second elastic strip 32 in the second elastic layer are configured such that, when the spring set 20 is pressed and compressed, a resultant force of an elastic force generated by the first elastic strip 31 is in a same straight line with a resultant force of an elastic force generated by the second elastic strip 32. In the exemplary structure shown in the figures, an intermediate fixing portion 23 is provided between the first elastic layer and the second elastic layer, the first lower end 34 of the first elastic strip 31 and the second upper end 35 of the second elastic strip 32 are connected to the intermediate fixing portion 23, and a connection position of the first lower end 34 of the first elastic strip 31 in the first elastic layer on the intermediate fixing portion 23 and a connection position of the second upper end 35 of the second elastic strip 32 in the second elastic layer corresponding to the first elastic strip 31 on the intermediate fixing portion 23 are aligned with each other along an axis of the spring set 20. Alternatively, in the case where the intermediate fixing portion 23 is not provided between the first elastic layer and the second elastic layer, the first lower end 34 of the first elastic strip 31 and the second upper end 35 of the second elastic strip 32 may be directly connected to each other.

[0039] In addition, the first elastic strip 31 and the corresponding second elastic strip 32 may also be arranged such that both the first lower end 34 of the first elastic strip 31 and the second upper end 35 of the second elastic strip 32 abut against the intermediate fixing portion 23, and the first lower end 34 and the second lower end 35 are arranged in a staggered manner. Such a structure also falls within the scope of the present application. In this case, the first elastic strips 31 in the first elastic layer may be arranged evenly spaced, and the second elastic strips 32 in the second elastic layer may also be arranged evenly spaced. This can also ensure that the elastic force generated by the first elastic layer is in the same straight line with the elastic force generated by the second elastic layer during compression.

[0040] Further, the first elastic strip 31 in the first elastic layer and the second elastic strip 32 in the second elastic layer are shaped and sized such that, when the spring set 20 is pressed, a direction of the resultant force of the elastic force of the first elastic strip 31 is in a straight line with a direction of the resultant force of the elastic force of the second elastic strip 32.

[0041] For example, in the embodiment shown in the figures, the first lower end 34 of the first elastic strip 31 is aligned with the second upper end 35 of the second elastic strip 32, while the first upper end 33 of the first elastic strip 31 and the second lower end 36 of the second elastic strip 32 are arranged in a same straight line L with the first lower end 34 and the second upper end 35. In this way, when the spring set 20 is compressed, the direction of the elastic force of the first elastic strip 31 is along the straight line L, and the direction of the elastic force of the second elastic strip 32 is also along the straight line L, thereby making the elastic forces of the first elastic strip 31 and the second elastic strip 32 superimposed along the same straight line.

[0042] When the first upper end 33 and the first lower end 34 of each of all the first elastic strips 31 in the first elastic layer are in the same straight line with the second upper end 35 and the second lower end 36 of the second elastic strip 32 corresponding to the first elastic strip 31, the resultant force of the first elastic strips 31 in the first elastic layer will be in the same straight line with the resultant force of the second elastic strips 32 in the second elastic layer. As a result, the respective resilience forces generated by the first elastic layer and the second elastic layer can be superimposed onto each other, substantially eliminating force components that may counteract each other.

[0043] Preferably, the straight line L is parallel to the axis of the spring set 20. In this way, the elastic forces of all the first elastic strips 31 and the elastic forces of all the second elastic strips 32 are all superimposed, and force components counteracting each other in the same elastic layer and between the two elastic layers can be substantially eliminated. This is conducive to maximizing the resilience force generated when the spring set 20 is compressed.

[0044] In addition to the structures of the first elastic strip 31 and the second elastic strip 32 shown in the figures, they may also take other forms to achieve the effect that the resultant forces of the first elastic strip 31 and the second elastic strip 32 are in a straight line. For example, in the case where a plurality of first elastic strips 31 and a plurality of second elastic strips 32 are provided, the plurality of first elastic strips 31 in the first elastic layer may be symmetrically arranged in a circumferential direction, or may be arranged at equal angular intervals in the circumferential direction, and the second elastic strips 32 may also be arranged similarly. Alternatively, in the case where one first elastic strip 31 and one second elastic strip 32 are provided, the first elastic strip 31 and the second elastic strip 32 may be fitted over the piston rod 15, and the direction of the elastic force generated by the first elastic strip and the second strip when being compressed and contracted coincides with the direction of the axis of the spring set 20.

[0045] In a preferred implementation structure shown in the figures, the spring set 20 includes an upper fixing portion 21 located at a top thereof and a lower fixing portion 22 located at a bottom thereof, and preferably further includes the intermediate fixing portion 23 arranged between two adjacent elastic layers.

[0046] In the two-layer structure shown in the figures, the first upper end 33 of the first elastic strip 31 is connected to the upper fixing portion 21, and the first lower end 34 thereof is connected to the intermediate fixing portion 23. The first upper end 33 of the second elastic strip 32 is connected to the intermediate fixing portion 23, and the first lower end 34 of the second elastic strip 32 is connected to the lower fixing portion 22. The upper fixing portion 21 is supported on a lower surface of the top of the press head 11, and the lower fixing portion 22 is supported on the spring support portion 14.

[0047] Preferably, a hinge connection portion 37 is provided on at least one of the first upper end 33, the first lower end 34, the second upper end 35 and the second lower end 36. When the spring set 20 is compressed, the hinge connection portion 37 is more likely to be deformed first, thereby guiding the subsequent deformation process of the first elastic strip 31. As a result, the pressing force required to press down the spring set 20 can be reduced, facilitating operation.

[0048] In other exemplary alternative structures, the upper fixing portion 21 may also be supported on other components of the movable part of the press pump 10, such as on a stepped portion formed on the piston rod 15, and the lower fixing portion 22 may also be supported on other components of the fixed part of the press pump 10, such as on the threaded collar 12.

[0049] A piston rod hole 24 is formed in each of the upper fixing portion 21, the lower fixing portion 22 and the intermediate fixing portion 23 of the spring set 20, and the piston rod 15 can pass through these piston rod holes 24, such that the spring set 20 is arranged around the piston rod 15.

[0050] Preferably, a rib 16 is formed on an outer surface of the piston rod 15, and the protruding strip 16 extends along an axis of the piston rod 15. Accordingly, a slot 25 is formed in the piston rod hole 24, a shape of the slot 25 matches a shape of the rib 16, and when the spring set 20 is mounted onto the piston rod 15, the rib 16 will be fitted into the slot 25. In this way, when the press head 11 and the piston rod 15 are pressed downward, if the press head 11 and the piston rod 15 are subjected to a force and rotate, the spring set 20 will rotate together with the piston rod 15. This avoids a relative rotation between the spring set 20 and the piston rod 15 during operation, which could otherwise affect the conversion efficiency of the resilience force.

[0051] FIG. 2c shows a cross-sectional view of the spring set 20 taken along line A-A in FIG. 2b. As can be seen, the first elastic strip 31 is close to the piston rod hole 24, as a result of which when the spring set 20 is mounted onto the piston rod 15, the first elastic strip 31 is arranged close to the piston rod 15. As a result, a larger deformation space can be provided for the first elastic strip 31, and accordingly the overall volume of the press pump 10 can be reduced.

[0052] Further, the second elastic strip 32 in the second elastic layer may also be arranged close to the piston rod 15, such that a larger deformation space can also be provided for the second elastic strip 32.<Second Embodiment>

[0053] FIGS. 3a to 3c show a structure of a spring set 20 of a second embodiment of the present application. The above specific structure described in the first embodiment is also applicable to the second embodiment unless otherwise described or conflicting. The following will specifically describe structural differences between the second embodiment and the first embodiment.

[0054] In the second embodiment, a projection of a first layer elastic strip 31' on a plane perpendicular to the axis of the spring set 20 has a curved shape, which is close to the piston rod hole 24' and extends around the piston rod hole 24', such that when the spring set 20 is mounted onto the piston rod 15, the first layer elastic strip 31' surrounds the piston rod 15. Such a surrounding structure is also conducive to providing a larger deformation space for the first layer elastic strip 31'.

[0055] Similarly, the second layer elastic strip 32' may also be formed as the structure extending to surround the piston rod 15.<Third Embodiment>

[0056] FIGS. 4a to 4c show a structure of a spring set 20 of a third embodiment of the present application. The above specific structures described in the first and second embodiments are also applicable to the third embodiment unless otherwise described or conflicting. The following will specifically describe structural differences between the third embodiment and the first and second embodiments.

[0057] The spring set 20 of the third embodiment includes a plurality of elastic layers, for example, a first elastic layer located at an upper portion thereof and a second elastic layer located at a lower portion thereof as shown in the figures. The first elastic layer includes at least one arcuate first elastic strip 31, and the second elastic layer includes at least one arcuate second elastic strip 32.

[0058] Further, in the third embodiment, the spring set 20 further includes a limit mechanism capable of limiting a maximum deformation of the spring set 20.

[0059] In a preferred structure shown in the figures, at least one limit support rod 38 is provided in at least one of the first elastic layer and the second elastic layer, and preferably in each elastic layer, and the limit support rod 38 is used for limiting a deformation amplitude of the first elastic strip 31 and / or the second elastic strip 32. In an exemplary structure shown in the figures, the limit support rod 38 is arranged on the intermediate fixing portion 23 between the first elastic layer and the second elastic layer. The limit support rod 38 has one end fixedly connected to the intermediate fixing portion 23, and the other end as a free end. During pressing of the spring set 20, as the spring set 20 is compressed, the free ends of the limit support rods 38 in each of the two elastic layers will respectively abut against the upper fixing portion 21 and the lower fixing portion 22, such that the spring set 20 can no longer continue to be compressed. As a result, by setting a height of the limit support rod 38, a maximum deformation of the corresponding elastic layer can be preset.

[0060] It is to be understood that the limit mechanism described above is not only applicable to the spring structure such as the illustrated spring set with arcuate elastic strips, but also applicable to other forms of spring structures, such as a spring structure including spiral elastic strips, a mesh elastic structure, etc.<Fourth Embodiment>

[0061] FIGS. 5 and 6 show a fourth embodiment of the present application. The above specific structures described in the first to third embodiments are also applicable to the fourth embodiment unless otherwise described or conflicting. The following will specifically describe structural differences between the fourth embodiment and the first to third embodiments.

[0062] As can be seen from FIG. 5, in the fourth embodiment, the press pump 10 includes a spring set 20 arranged outside the cylinder 13 and around the cylinder 13. A through slot 18 is formed on the cylinder 13, a protrusion 19 is formed on the movable part of the press pump 10, for example, on an outer surface of an inner sleeve of the press head 11 or on an outer surface of the piston rod 15 connected to the press head 11, and the protrusion 19 passes through the through slot 18 on the cylinder 13 and extends outside of the cylinder 13. The upper fixing portion 21 of the spring set 20 abuts against the protrusion 19. Furthermore, the lower fixing portion 22 of the spring set 20 is fixed to the fixed part of the press pump 10, for example, to a bottom of the cylinder 13, or to a suction pipe of the press pump 10 connected to a lower end of the cylinder 13.

[0063] The preferred structures of the present application are described above. Based on the present disclosure, various obvious modifications and variations can be made by those skilled in the art.

[0064] In the structure shown in the figures, the upper fixing portion 21, the lower fixing portion 22 and the intermediate fixing portion 23 of the spring set 20 are circular. In addition, these fixing portions may also take other shapes, such as elliptical or polygonal.

[0065] The embodiment shown in the figures is exemplified by two elastic layers. In addition, the spring set 20 may also include a greater number of elastic layers, such as three layers or four layers. Accordingly, the upper fixing portion 21 is arranged at the top of the spring set 20, the lower fixing portion 22 is arranged at the bottom of the spring set 20, and the intermediate fixing portion 23 may be arranged in the middle between adjacent elastic layers.

[0066] Furthermore, any one of the upper fixing portion 21, the lower fixing portion 22 and the intermediate fixing portion 23 can be omitted. For example, when the upper fixing portion 21 is omitted, the upper end of the elastic strip of the top elastic layer can directly abut against the movable part of the press pump 10; when the lower fixing portion 22 is omitted, the lower end of the elastic strip of the bottom elastic layer can be directly fixedly connected to the fixed part of the press pump 10; and when the intermediate fixing portion 23 is omitted, corresponding upper and lower ends of the elastic strips of adjacent layers are directly connected to each other.

[0067] In an exemplary structure shown in the figures, the first elastic strip 31 in the first elastic layer and the second elastic strip 32 in the second elastic layer are identically shaped and sized, that is, they may have the same chord lengths, arc lengths, radians, and cross-sectional shapes. However, depending on different application situations and practical needs, the first elastic strip 31 and the second elastic strip 32 may also be different in at least one of these parameters, for example, having different chord lengths, different arc lengths, different radians, different cross-sectional shapes, etc. Factors to be considered when designing the shapes and sizes of the elastic strips include the viscosity of the product, pressing feel, a required rebound speed, an amount of product output to be obtained in a single pumping, etc.

[0068] The limit mechanism and specifically at least one limit support rod is mentioned in the above embodiment. It will be apparent to those skilled in the art that the arrangement of the limit mechanism may also be used in a spring set including other types of elastic strips, such as S-shaped, X-shaped, linear, or hyperbolic elastic strips. Moreover, the limit support rod can be fixedly connected to the intermediate fixing portion between two adjacent elastic layers, as shown in FIGS. 7a to 7o. Alternatively, in the case where no intermediate fixing portion is provided, the limit support rod may also be fixedly connected to an elastic strip, as shown in FIGS. 8a to 8j.

[0069] For the spring set 20, it may be formed as one piece, as shown in the figures. Alternatively, the spring set 20 may also be formed by stacking a plurality of springs. For example, the spring set as shown in FIG. 7b is formed by stacking two springs. According to the needs in specific application situations, any number of springs may be provided to be stacked to form the spring set.

Claims

1. A spring set for a press pump, comprising at least two elastic layers, the at least two elastic layers comprising a first elastic layer and a second elastic layer, the first elastic layer comprising at least one arcuate first elastic strip, the second elastic layer comprising at least one arcuate second elastic strip, the first elastic strip having a first upper end and a first lower end, and the second elastic strip having a second upper end and a second lower end, characterized in that the first elastic strip and the second elastic strip are configured such that, when the spring set is pressed, a direction of a resultant force of an elastic force of the first elastic strip is in a straight line with a direction of a resultant force of an elastic force of the second elastic strip.

2. The spring set according to claim 1, characterized in that the first lower end of the first elastic strip and the second upper end of the corresponding second elastic strip are aligned with each other or directly connected to each other.

3. The spring set according to claim 2, characterized in that the first upper end and the first lower end of the first elastic strip and the second upper end and the second lower end of the corresponding second elastic strip are arranged in the straight line.

4. The spring set according to any one of claims 1 to 3, characterized in that the straight line is parallel to an axis of the spring set.

5. The spring set according to claim 1, characterized in that the spring set comprises an upper fixing portion located at a top of the spring set and a lower fixing portion located at a bottom of the spring set.

6. The spring set according to claim 5, characterized in that the spring set comprises at least one intermediate fixing portion arranged between two adjacent elastic layers of the at least two elastic layers.

7. The spring set according to claim 6, characterized in that the first lower end of the first elastic strip and the second upper end of the corresponding second elastic strip abut against the intermediate fixing portion and are arranged in a staggered manner.

8. The spring set according to claim 6, characterized in that a piston rod hole is formed in each of the upper fixing portion, the lower fixing portion and the intermediate fixing portion for a piston rod of the press pump to pass through, wherein at least one of the first elastic strip and the second elastic strip is close to the piston rod hole.

9. The spring set according to claim 6, characterized in that a piston rod hole is formed in each of the upper fixing portion, the lower fixing portion and the intermediate fixing portion for a piston rod of the press pump to pass through, wherein a projection of at least one of the first elastic strip and the second elastic strip on a plane perpendicular to an axis of the spring set has a curved shape, is close to the piston rod hole, and extends around the piston rod hole.

10. The spring set according to claim 6, characterized in that the upper fixing portion, the lower fixing portion and the intermediate fixing portion are formed in one or a combination of a circular shape, an elliptical shape, and a polygonal shape.

11. The spring set according to claim 6, characterized in that a hinge connection portion is provided on at least one of the first upper end, the first lower end, the second upper end and the second lower end.

12. The spring set according to claim 1, characterized in that at least one of the at least two elastic layers comprises a limit mechanism for limiting a maximum deformation of the spring set.

13. The spring set according to claim 12, characterized in that the limit mechanism comprises at least one limit support rod, the limit support rod having one end fixedly connected to an intermediate fixing portion between two adjacent elastic layers of the at least two elastic layers, and the other end as a free end.

14. A spring set for a press pump, comprising at least two elastic layers, the at least two elastic layers comprising a first elastic layer and a second elastic layer, the first elastic layer comprising at least one first elastic strip, and the second elastic layer comprising at least one second elastic strip, characterized in that at least one of the at least two elastic layers comprises a limit mechanism, the limit mechanism defining a minimum height of the corresponding elastic layer after being compressed.

15. The spring set according to claim 14, characterized in that the limit mechanism comprises at least one limit support rod, the limit support rod having one end fixedly connected to the corresponding elastic layer, and the other end as a free end.

16. A press pump, comprising a movable part and a fixed part, characterized in that the press pump comprises a spring set according to claim 1 or 14, a top of the spring set is supported on the movable part, and a bottom of the spring set is supported on the fixed part.

17. The press pump according to claim 16, characterized in that the fixed part comprises a press head and a piston rod connected to a lower portion of the press head, and the fixed part comprises a threaded collar and a cylinder fixedly connected together, the piston rod extending into the cylinder.

18. The press pump according to claim 17, characterized in that the spring set comprises an upper fixing portion located at a top of the spring set, a lower fixing portion located at a bottom of the spring set, and at least one intermediate fixing portion arranged between two adjacent elastic layers of the at least two elastic layers, wherein a piston rod hole is formed in each of the upper fixing portion, the lower fixing portion and the intermediate fixing portion for the piston rod of the press pump to pass through, a slot is formed in the piston rod hole, a rib is formed on an outer surface of the piston rod, and a shape of the rib matches a shape of the slot.

19. The press pump according to claim 17, characterized in that the spring set is arranged outside the cylinder and surrounding the cylinder.

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