CN114537879A

CN114537879A - Push type liquid pump

Info

Publication number: CN114537879A
Application number: CN202011350922.7A
Authority: CN
Inventors: 丁要武
Original assignee: Individual
Current assignee: Individual
Priority date: 2020-11-26
Filing date: 2020-11-26
Publication date: 2022-05-27
Also published as: WO2022111176A1

Abstract

A push type liquid pump comprising: the pressing head is provided with a piston rod; a tooth socket; the cylinder is connected with the tooth socket, one end of the piston rod is connected with the pressure head, and the other end of the piston rod extends into the cylinder; and the elastic resetting device comprises at least one elastic strip and is arranged between the pressure head and the tooth socket so as to apply upward bias force to the pressure head. The elastic reset device can be provided with a loosening structure, so that the linear distance between two ends of the elastic strip is larger than that in the opening state when the push type liquid pump is in the locking state. Therefore, the problem of yield deformation of the elastic resetting device can be solved. In addition or alternatively, a first deformation receptacle is provided on the pressure head, into which the elastic strip of the elastic return device enters at least partially when the elastic strip is deformed and bent. The press type liquid pump with the structure allows the diameter of the pressure head/tooth socket to be smaller, so that the appearance is attractive, and raw materials can be saved.

Description

Push type liquid pump

Technical Field

The invention relates to a liquid pump for pumping a product from a container, in particular to a pressing type liquid pump with an upper lock head.

Background

On packaging containers for household products such as shampoos, shower milks or similar products, liquid pumps are often fitted for pumping the product out of the container for use by the consumer. As used herein, the term "liquid pump" includes any pump mechanism capable of pumping any flowable or semi-flowable product, including liquids, emulsions, suspensions, and the like.

The push type liquid pump on the existing market mostly adopts a metal spring to realize the reset of the liquid pump. Metal springs, however, have some drawbacks, such as the metal springs being susceptible to moisture or rusting due to contact with the liquid product in the container. The rusted spring is rusted off, so that the liquid pump cannot work normally. Moreover, rust from a rusted spring can contaminate the product liquor in the container. If the stainless steel spring is adopted to prevent the spring from rusting, the cost of the liquid pump is increased, and when the liquid pump needs to be recycled, the spring and other plastic parts of the liquid pump need to be disassembled and separated and recycled respectively, so that the recycling cost and difficulty of the liquid pump are increased.

In view of the above-mentioned drawbacks of the metal springs, emulsion pumps using plastic springs, which may take various forms such as bellows type, spiral type, elastic strip type, etc., are currently on the market. Plastic has a large difference in properties, particularly in spring force, compared to metal materials such as stainless steel, and thus plastic springs are often larger in size than metal springs to obtain spring force comparable to metal springs.

In practical applications, plastic springs present some limitations. Specifically, first, the plastic spring is easily deformed after being pressed for a long time, causing deterioration of the elastic force of the spring, thereby causing the liquid pump to fail to operate normally.

In addition, a relatively large plastic spring tends to be disposed in the neck of the liquid pump, limited by the size of the neck of the container. Moreover, even if the plastic spring is disposed at the neck of the liquid pump, the plastic spring is exposed only outside the neck of the liquid pump in order to accommodate the space required for deformation of the plastic spring. Such an arrangement can detract from the aesthetic appearance of the fluid pump, and the exposed plastic spring can be easily damaged during shipping. However, if the plastic spring is covered with a large sleeve, the appearance becomes bulky, and the material used for manufacturing the spring is large, which increases the manufacturing cost.

Accordingly, there is a need in the art for a structurally improved liquid pump that overcomes at least one of the technical problems discussed above.

Disclosure of Invention

The present invention has been made to solve at least one of the above problems occurring in the prior art. The invention aims to provide a pressing type liquid pump with an improved structure, which can reduce or delay the problem that an elastic resetting device fails due to yield deformation. Alternatively or additionally, a push-type liquid pump is provided that allows the pressure head and mouthpiece to be made of smaller diameter, while allowing a resilient return means, such as a plastic spring, to be deformed without being constrained by the pressure head and mouthpiece sleeve.

The push type liquid pump of the present invention comprises: the pressing head is provided with a piston rod and can rotate between a first position and a second position, when the pressing head is located at the first position, the pressing type liquid pump is in a locking state, and when the pressing head is located at the second position, the liquid pump is in an opening state; the tooth socket is internally provided with a cylinder cover part; the cylinder is connected with the tooth socket, one end of the piston rod is connected with the pressure head, and the other end of the piston rod extends into the cylinder; and the elastic resetting device comprises at least one elastic strip and a supporting part and is arranged between the pressure head and the tooth socket so as to apply upward bias force to the pressure head, and the lower end of the at least one elastic strip is connected to the supporting part. Wherein, be provided with the protruding portion on facing or cylinder cap portion, the supporting part supports and leans on the protruding portion to, be provided with at the bottom of supporting part and loosen the structure, in the locking state, loosen the structure and support and lean on in the protruding portion, make to be first linear distance between the both ends of at least one elastic strip, and in the open mode, it staggers to loosen structure and protruding portion, makes to be second linear distance between the both ends of at least one elastic strip, wherein first linear distance is greater than second linear distance.

By means of the liquid pump with the structure, particularly the structure arrangement of the elastic resetting device, the elastic resetting device can be better accommodated in the process of product transportation, and in addition, the problem that the elastic resetting device is subjected to yielding deformation due to long-time compression can be avoided or alleviated.

Preferably, the support portion is provided to be elastically deformable, and the support portion may be substantially divided into two parts, i.e., a connection portion connected to the lower end of the at least one elastic strip and a remaining portion other than the connection portion, and the above-mentioned relief structure is formed in the remaining portion, and in the locked state, the relief structure abuts against the projection to make the support portion take the initial state, and in the open state, the relief structure is offset from the projection, and the connection portion abuts against the projection to make the support portion deform.

Specifically, the loosening structure is a hinge portion formed in a portion of the support portion other than the connection portion.

Alternatively, in another structure, the supporting portion is a sheet that is easily elastically deformed, and the loosening structure is constituted by a portion of the supporting portion in the form of the sheet other than the connecting portion.

Alternatively, in still another structure, the loosening structure is a recess formed in a portion of the support portion other than the connecting portion.

It is also preferable that a projection is formed on a bottom of the support portion of the elastic restoring means, and the relaxing structure is formed by a portion of the support portion other than the projection.

On the other hand, as an additional or alternative structure to the loosening structure in the elastic resetting device described above, a first deformation receiving portion may be further provided on the pressing head, into which the elastic strip of the elastic resetting device at least partially enters when the elastic strip is deformed and bent.

Here, the provision of the deformation accommodation may be used in combination with the specific structure of the elastic return means described above, or both may be applied independently of each other in different embodiments. That is, the push type liquid pump may include: the pressing head is provided with a piston rod; a tooth socket; the cylinder is connected with the tooth socket, one end of the piston rod is connected with the pressure head, and the other end of the piston rod extends into the cylinder; and the elastic resetting device comprises at least one elastic strip and is arranged between the pressure head and the tooth socket so as to apply upward bias force to the pressure head, wherein a first deformation accommodating part is arranged on the pressure head, and when the elastic strip of the elastic resetting device is deformed and bent, the elastic strip at least partially enters the first deformation accommodating part.

With the above-structured press-type liquid pump, the elastic restoring means can be hidden in the indenter and/or the mouthpiece during storage and transportation, and deformation of the elastic restoring means can be at least partially received by the first deformation receiving portion during press use. Therefore, it is possible to allow the head to be made smaller in diameter, so that the overall appearance of the liquid pump is beautiful, and further, the raw material can be saved.

In a specific configuration, the ram includes a ram outer sleeve, and the first deformation accommodating portion includes at least one of the following structures formed on the ram outer sleeve:

at least one first notch portion, wherein in a use state, the first notch portion is aligned with a corresponding one of the elastic strips, and when the elastic strip is deformed, the elastic strip can partially pass through the first notch portion;

at least one first window portion, wherein, in a use state, the first notch portion is aligned with a corresponding one of the elastic strips, and when the elastic strip is deformed, the elastic strip can partially pass through the first notch portion; and

at least one enlarged portion, wherein in a use state, the enlarged portion is aligned with a corresponding one of the elastic strips, and the elastic strips are at least partially receivable in the enlarged portion when the elastic strips are deformed.

Preferably, the mouthpiece includes a mouthpiece sleeve, and a second deformation receptacle is formed on the mouthpiece sleeve, the second deformation receptacle being aligned with the first deformation receptacle. The second deformation containing part is matched with the first deformation containing part to contain the deformation of the elastic reset device.

In a particular configuration, the second deformation receptacle comprises at least one of the following structures formed on the mouthpiece sleeve:

at least one second notch portion, wherein in a use state, the second notch portion is aligned with a corresponding one of the elastic strips, and when the elastic strip is deformed, the elastic strip can partially pass through the second notch portion; and

at least one second window, wherein in a use state, the second window is aligned with a corresponding one of the elastic strips, and when the elastic strips are deformed, the elastic strips can partially pass through the second window.

Preferably, the pressing type liquid pump further comprises a synchronous rotating mechanism configured such that the elastic restoring means can rotate together with the pressing head relative to the mouthpiece.

Specifically, the ram includes a ram inner sleeve disposed inside the ram outer sleeve coaxially with the ram outer sleeve, and the synchronous rotation mechanism includes:

at least one rib formed on the outer surface of the ram inner sleeve or the piston rod; and

at least one groove formed on the elastic resetting device, and the groove is matched with the convex strip.

Alternatively, in another specific structure, the ram includes a ram inner sleeve disposed inside the ram outer sleeve coaxially with the ram outer sleeve, and the synchronous rotation mechanism includes:

at least one slot formed on the outer surface of the ram inner sleeve or piston rod; and

at least one protrusion formed on the resilient return means, the slot mating with the protrusion.

Preferably, an alignment indicating structure is provided between the indenter and the mouthpiece to indicate that the first deformation-receiving portion and the second deformation-receiving portion are aligned with each other.

Drawings

There is shown in the drawings, which are incorporated herein by reference, non-limiting preferred embodiments of the present invention, the features and advantages of which will be apparent. Wherein:

fig. 1a is a sectional view of a liquid pump of a first embodiment of the present invention.

Fig. 1b is a partially cut-away perspective view of the liquid pump shown in fig. 1 a.

Fig. 2a is a cross-sectional view taken along line a-a in fig. 1 a.

Fig. 2B is a cross-sectional view taken along line B-B in fig. 1B.

Fig. 3a and 3b are a side view and a front view, respectively, showing the liquid pump of fig. 1a and 1b in a standby position.

Fig. 4a and 4b are a side view and a front view, respectively, showing the liquid pump of fig. 1a and 1b in a depressed position.

Fig. 5a shows a front view of the elastic return means of the liquid pump shown in fig. 1a and 1 b.

Fig. 5b shows a perspective view of the elastic return means shown in fig. 5a, wherein the elastic return means 140 is in a relaxed state.

Fig. 5c shows a perspective view of the elastic return means shown in fig. 5a, wherein the elastic return means 140 is in a compressed state.

Fig. 6a shows a bottom view of the head of the liquid pump shown in fig. 1a and 1 b.

Figure 6b shows a perspective view of the indenter shown in figure 6 a.

FIG. 7a shows a cross-sectional view of a mouthpiece of the liquid pump shown in FIGS. 1a and 1 b.

Figure 7b illustrates a perspective view of the mouthpiece shown in figure 7 a.

Figure 8a shows a front view of the head of a liquid pump of a second embodiment of the present invention.

Figure 8b shows a perspective view of the ram shown in figure 8 a.

FIG. 9a shows a cross-sectional view of a mouthpiece of a liquid pump of a second embodiment of the present invention.

Figure 9b illustrates a perspective view of the mouthpiece shown in figure 9 a.

Figure 10a shows a bottom view of the head of a liquid pump of a third embodiment of the present invention.

Figure 10b shows a perspective view of the ram shown in figure 10 a.

Figure 10c shows a perspective view of the indenter shown in figure 10a from another angle.

Fig. 11 shows a sectional view of a liquid pump of a fourth embodiment of the present invention.

FIG. 12 illustrates a cross-sectional view of the head of the liquid pump illustrated in FIG. 11.

Fig. 13 shows a cross-sectional view of the piston rod of the liquid pump shown in fig. 11.

Fig. 14 shows a front view of another elastic return means usable in the liquid pump of the present invention, in which the elastic strips of the elastic return means are arranged symmetrically.

Fig. 15a shows a sectional view of a liquid pump of a fifth embodiment of the present invention, in which the liquid pump is in a locked state.

Fig. 15b shows another cross-sectional view of the liquid pump shown in fig. 15a, wherein the liquid pump is in an open state.

Fig. 16 is a perspective view showing a state in which a pressing head and an elastic restoring means are mounted together in the liquid pump shown in fig. 15a and 15 b.

Fig. 17a shows a perspective view of the elastic return means in the liquid pump shown in fig. 15a and 15 b.

Fig. 17b shows a front view of the elastic return means of fig. 17 a.

Figure 18a shows a cross-sectional view of a mouthpiece in the liquid pump shown in figures 15a and 15 b.

Figure 18b illustrates a perspective cutaway view of the mouthpiece shown in figure 18 a.

Fig. 19a shows a perspective view of the elastic return means in a deformed configuration.

Fig. 19b shows a schematic view of the structural switching of the elastic return means shown in fig. 19a between the open state and the locked state of the liquid pump.

Fig. 20 shows a schematic view of the structural switching of the elastic return means of another variant between the open state and the locked state of the liquid pump.

Fig. 21 shows a front view of the elastic return means in a further variant.

Detailed Description

In order to facilitate understanding of the present invention, specific embodiments thereof will be described in detail below with reference to the accompanying drawings. It is to be understood that only the preferred embodiment of the present invention has been shown in the drawings and should not be considered as limiting the scope of the invention. Various obvious modifications, variations and equivalents of the present invention may be made by those skilled in the art on the basis of the embodiments shown in the drawings, and the technical features in the different embodiments described below may be arbitrarily combined with each other without contradiction, and these are within the scope of the present invention.

In the following detailed description of the present invention, terms indicating directions and orientations such as "upper" and "lower" are used with reference to the orientation of the liquid pump shown in the drawings. It will be appreciated that the orientation of the liquid pump may vary depending on the particular application.

< first embodiment >

Fig. 1-7b show a liquid pump 100 according to a first embodiment of the invention. The liquid pump 100 includes a ram 110, a mouthpiece 120, a cylinder 130 and a resilient return means 140. A piston rod 150 is provided on the ram 110. The mouthpiece 120 and the cylinder 130 are connected together, and one end of the piston rod 150 is connected to the lower portion of the ram 110, and the other end thereof extends into the cylinder 130. Resilient return means 140 is provided between the ram 110 and the mouthpiece 120 to apply an upward biasing force to the ram 110 so that the ram 110 returns to its top dead centre of travel when the user removes the pressing force.

The structure of each component of the liquid pump 100 will be described in detail below.

< elastic restoring device >

Fig. 5a to 5c show the elastic strip 141 in the liquid pump 100 of the first embodiment shown in fig. 1a and 1 b.

As shown, the resilient return means 140, for example a plastic spring, has at least one, preferably a plurality of resilient strips 141. In the preferred construction of the illustrated resilient return means 140, the resilient return means 140 may further comprise one or both of an upper retainer ring 143 and a lower retainer ring 144. The upper end of the elastic strip 141 is fixedly coupled to the upper fixing ring 143, and the lower end of the elastic strip 141 is fixedly coupled to the lower fixing ring 144. As can be seen in fig. 1a, the upper retaining ring 143 abuts on the indenter 110 and the lower retaining ring 144 abuts on the mouthpiece 120, whereby the resilient return means 140 exerts a biasing force between the indenter 110 and the mouthpiece 120.

In a further preferred construction, a groove 142 is provided on the upper retainer ring 143 and/or the lower retainer ring 144, and the groove 142 cooperates with a rib 114, which will be described later, to constitute a synchronous rotation mechanism.

Of course, the arrangement of the upper and lower fixing rings 143 and 144 is optional, that is, the upper and lower fixing rings 143 and 144 may be omitted. At this time, the upper end of the elastic strip 141 may be connected to the indenter 110, and the lower end of the elastic strip 141 may be connected to the mouthpiece 120. One of the connection of the upper end of the elastic strip 141 to the indenter 110 and the connection of the elastic strip 141 to the mouthpiece 120 is a fixed connection, and the other is a relatively movable contact. The structure of such a resilient return means 140 is also within the scope of the present invention.

In the configuration shown in the figures, the elastic return means 140 comprise two elastic strips 141 arranged at 180 ° from each other. The two elastic strips 141 are arranged crosswise to each other, i.e. as can be seen more clearly in fig. 5a, and the two elastic strips 141 are deformed in two mutually parallel planes, as shown in fig. 5b and 5 c.

In addition to this, the elastic return means 140 can also take other forms, for example, the elastic return means 140 can comprise two elastic strips 141 arranged symmetrically to each other, and the two elastic strips 141 can be deformed in the same plane, the elastic return means 140 being as shown in fig. 14.

< indenter >

Fig. 6a and 6b show a bottom view and a perspective view, respectively, of the head 110 of the liquid pump 100 of the first embodiment.

Ram 110 includes a ram outer sleeve 111 and a ram inner sleeve 112, and the piston rod 150 described above is attached to ram inner sleeve 112 (shown in figure 1 a). Ram outer sleeve 111 and ram inner sleeve 112 are preferably disposed substantially coaxially. The ram outer sleeve 111 is provided with at least one first notched portion 113. Of course, the number of the first notched portions 113 may be set according to actual needs, and particularly, the number of the first notched portions 113 corresponds to the number of the elastic strips 141 of the elastic restoring device 140, for example, the number of the first notched portions 113 is equal to or greater than the number of the elastic strips 141.

The position of the first notch 113 also corresponds to the position of the elastic strip 141. For example, the elastic restoring means 140 shown in the drawings includes two elastic strips 141 spaced 180 ° apart from each other, and accordingly, two first cut-out portions 113 spaced 180 ° apart from each other are formed on the indenter outer sleeve 111 of the indenter 110, and each elastic strip 141 is aligned with the corresponding first cut-out portion 113.

To ensure that the resilient strips 141 are aligned with the corresponding first notches 113, it is preferred that a rib 114 be formed on the outer surface of the ram inner sleeve 112 of the ram 110, the rib 114 engaging the groove 142 on the resilient return means 140 as described above. In this way, when the pressing head 110 is rotated to switch the pressing head 110 between the locking state and the use state, the elastic restoring means 140 can be rotated together with the pressing head 110, so that the elastic bars 141 are always aligned with the corresponding first notch portions 113.

< mouthpiece >

Figures 7 a-7 b show a cross-sectional view and a perspective view, respectively, of mouthpiece 120 of liquid pump 100 of the first embodiment.

The mouthpiece 120 includes a mouthpiece sleeve 121, and at least one second gap portion 122 is formed on the mouthpiece sleeve 121. The specific number and arrangement position of the second cut-out portions 122 correspond to the first cut-out portions 113 on the indenter 110.

For example, in the structure shown in the figures, the indenter outer sleeve 111 of the indenter 110 includes two first cut-out portions 113 spaced 180 ° apart from each other, and correspondingly, two second cut-out portions 122 spaced 180 ° apart from each other are formed on the mouthpiece sleeve 121 of the mouthpiece 120. In the use state of the liquid pump 100, the first notched portion 113 of the indenter 110 is aligned with the second notched portion 122 of the mouthpiece 120, thereby allowing the elastic strip 141 of the elastic return device 140 to pass through the first notched portion 113 and the second notched portion 122 when deformed.

To indicate to the user that the first and second

cutaway portions

113, 122 are aligned, an alignment indicating structure (not shown), such as a bump-and-dimple arrangement, may be provided between the ram 110 and the mouthpiece 120, and when the ram 110 is rotated to a position such that its first cutaway portion 113 is aligned with the second cutaway portion 122 of the mouthpiece 120, the bump will mate with the dimple, and will typically make a slight "click" to indicate that the first and second

cutaway portions

113, 122 are aligned. In addition, other conventional alignment indicating structures may be employed to indicate the alignment between the first and

second notch portions

113 and 122.

< operation >

The operation of the liquid pump 100 of the present invention will be described with reference to fig. 1a to 4 b. As shown in fig. 1a and 2a, in the initial state, the biasing force of the elastic return means 140 causes the ram 110 to be at its top dead center position of travel, at which time the elastic return means 140 is accommodated in the space enclosed by the ram outer sleeve 111 of the ram 110. Also, as more clearly shown in fig. 3a and 3b, the first and second notched

portions

113 and 122 may be offset from each other.

Next, the indenter 110 is rotated such that the first notched portion 113 of the indenter 110 is aligned with the second notched portion 122 of the mouthpiece 120, as shown in FIGS. 1b and 2 b. Next, the pressing head 110 is pressed downward, so that the elastic strip 141 of the elastic restoring means 140 is deformed and bent. The deformed and bent elastic strip 141 can pass through the first and

second notch portions

113 and 122 aligned with each other, as can be seen more clearly in fig. 4a and 4 b.

Therefore, the first and second cut-out

portions

113 and 122 allow the elastic strip 141 of the elastic restoring device 140 located inside the outer sleeve 111 of the pressing head 110 to be deformed outward without being restricted by the pressing head 110 when the pressing head 110 is pressed downward, and after use, the elastic strip 141 can be restored to its original shape and hidden inside the outer sleeve 111 of the pressing head without affecting the appearance of the liquid pump 100.

< second embodiment >

Fig. 8a to 9b show the specific structure of the head 210 and the mouthpiece 220 of the liquid pump of the second embodiment of the present invention. In the following description of the second embodiment, the technical features of the second embodiment different from those of the first embodiment will be mainly described, and unless there is a contrary description in the following or conflicting with other technical features, the features described in the first embodiment are also applicable to the second embodiment, and will not be described in detail herein.

Fig. 8a and 8b show a head 210 of a liquid pump of a second embodiment. The ram 210 includes a ram outer sleeve 211 and a ram inner sleeve 212, with at least one first window 213 disposed in the ram outer sleeve 211. Preferably, two or more first window portions 213 are provided on the ram outer sleeve 211, spaced apart from each other. The first window portions 213 are equally spaced apart from each other. Of course, the intervals between the first window portions 213 may not be equal.

Fig. 9a and 9b show a mouthpiece 220 of a liquid pump of a second embodiment. At least one second window portion 222 is provided on the mouthpiece sleeve 221 of the mouthpiece 220. The number and the arrangement positions of the second window portions 222 correspond to the first window portions 213 on the ram 210. For example, the number of the second window portions 222 may be equal to the number of the first window portions 213, and in the use state, each second window portion 222 is aligned with its corresponding first window portion 213, so that the elastic strip of the deformed elastic return device can pass through the first window portion 213 and the second window portion 222, i.e., is not limited by the outer sleeve 211 of the indenter 210.

< third embodiment >

Fig. 10a to 10c show a specific structure of a head 310 of a liquid pump of a third embodiment of the present invention. In the following description of the third embodiment, technical features of the third embodiment different from those of the first and second embodiments will be mainly described, and unless there is a contrary description in the following or conflicting with other technical features, the features described in the first and second embodiments are also applicable to the third embodiment, and will not be described in detail herein.

As shown, in the third embodiment, the head 310 of the liquid pump includes a head outer sleeve 311 and a head inner sleeve 312, with at least one, and preferably two or more, enlarged portions 313 formed on the head outer sleeve 311. These enlarged portions 313 may be equally spaced from one another, such as shown in the figures where two enlarged portions 313 are formed on indenter outer sleeve 311 that are spaced 180 ° apart from one another. Of course, the spacing between enlarged portions 313 may be different and are within the scope of the present invention.

Corresponding to the enlarged portion 313, the notch portions (e.g., second notch portion 122) and/or window portions (e.g., second window portion 222) disclosed above in the first embodiment may be provided on the mouthpiece of the liquid pump, the number and positions of which may correspond to the enlarged portion 313 on the head 310, and in the use state, the notch portions and/or window portions are aligned with the enlarged portion 313.

Thus, in the use state, when the ram 310 is pressed downward, the deformed elastic strip of the elastic return means may pass through the notch portion and/or the window portion on the mouthpiece into the enlarged portion 313.

< fourth embodiment >

Fig. 11-13 illustrate a liquid pump 400 according to a fourth embodiment of the present invention. In the following description of the fourth embodiment, technical features of the fourth embodiment different from those of the first to third embodiments will be mainly described, and unless there is a contrary description in the following or conflicting with other technical features, the features described in the first to third embodiments are also applicable to the fourth embodiment, and will not be described in detail herein.

The liquid pump 400 of the fourth embodiment includes a head 410, a mouthpiece 420, and a cylinder 430. Ram 410 includes ram outer sleeve 411 and piston rod 450 is mounted inside ram outer sleeve 411. At least one cut-out portion 413, preferably two or more cut-out portions 413, are formed on the ram outer sleeve 411, the specific number and position of which correspond to the number and position of the elastic strips of the elastic restoring means 440.

In addition, in the structure of the liquid pump 400 of the fourth embodiment shown in the drawings, the mouthpiece 420 does not have a mouthpiece sleeve. Thus, in the use state of the liquid pump 400, the notched portion 413 is aligned with the elastic strip of the elastic restoring means 440, and when the pressing head 410 is pressed down, the elastic strip of the elastic restoring means 440 is deformed to pass through the notched portion 413.

In addition, as shown in fig. 13, a protrusion 451 is formed on the piston rod 450, and it cooperates with a corresponding groove on the elastic restoring means 440 to function as a synchronous rotation mechanism.

< fifth embodiment >

Fig. 15a to 21 show a liquid pump 500 of a fifth embodiment of the present invention. In the following description of the fifth embodiment, technical features of the fifth embodiment different from those of the first to fourth embodiments will be mainly described, and unless there is a contrary description in the following or conflicting with other technical features, the features described in the first to fourth embodiments are also applicable to the fifth embodiment, and will not be described in detail herein.

Fig. 15a shows a cross-sectional view of the liquid pump 500 of the fifth embodiment in a locked state. Similar to the previous embodiment, the liquid pump 500 includes a ram 510, a mouthpiece 520, a cylinder 530 and a resilient return 540. A piston rod 550 is connected below the ram 510. Fig. 15b shows the configuration when the liquid pump 500 is switched to the open state.

As shown in fig. 16, the elastic return means 540 is fitted over the piston rod 550 and rotates with the ram 510 by the same or similar structure as the synchronous rotation mechanism described in the above embodiment.

As shown in fig. 17a and 17b, the elastic restoring means 540 includes at least one, preferably a plurality of elastic strips 541 (two elastic strips 541 are shown), one end (lower end in the figure) of each elastic strip 541 is connected to the supporting portion 542, and at least one projection 543 is provided at the bottom of the supporting portion 542.

Fig. 18a and 18b show the structure of the mouthpiece 520, wherein inside the mouthpiece inner sleeve 522 of the mouthpiece 520 a cylinder head portion 521 is connected, which cylinder head portion 521 covers the cylinder 530 in the mounted state, as shown in fig. 15a and 15 b. In the construction shown in the figures, the cylinder head portion 521 is integrally formed in the mouthpiece inner sleeve 522 of the mouthpiece 520, although it will be appreciated by those skilled in the art that a cylinder head portion 521 separate from the mouthpiece 520 may be provided and that the cylinder head portion 521 is attached to the mouthpiece 520 in a variety of conventional known manners.

A protrusion 523 is formed on the cylinder head portion 521 of the mouthpiece 520, and the protrusion 523 preferably protrudes radially, but may protrude in other manners, such as axially upward from an outer peripheral edge of an upper surface of the cylinder head portion 521, or the like. The protrusion cooperates with a projection 543 on the resilient return means 540. When the liquid pump 500 is in the locked state shown in fig. 15a, the bump 543 and the protrusion 523 are staggered, and when the liquid pump 500 is switched to the open state (or standby state) shown in fig. 15b, the bump 543 and the protrusion 523 are aligned, so that the bump 543 and the protrusion 523 are abutted against each other, and the linear distance between the two ends of the elastic strip 541 of the elastic resetting device 540 is reduced. In other words, in the locked state shown in fig. 15a, the linear distance between the two ends of the elastic strip 541 of the elastic return means 540 is longer than the linear distance between the two ends in the open state shown in fig. 15b, so that the elastic return means 540 is relaxed in the locked state of the liquid pump 500. The difference in the length of the linear distance between the two ends of the elastic strip 541 in the two states is H shown in fig. 17 b.

Fig. 19a and 19b show a modified structure of the elastic return means 540, which comprises an elastic strip 541 ' and a support portion 542 ', while the support portion 542 ' is an elastically deformable member. Specifically, as shown in fig. 19a, the supporting portion 542 'is formed with a hinge portion 543'. Fig. 19b shows a change in the structure of the resilient return means 540' as the liquid pump 500 is switched between the locked state and the open state. As shown in the left side of fig. 19b, when the liquid pump 500 is in an open state, the portion of the support portion 542 ' connected to the elastic strip 541 ' comes into contact with the protrusion 523 in the mouthpiece 520 (or the cylinder head portion 521), causing the support portion 542 ' to be elastically deformed, thereby biasing the lower end of the elastic strip 541 ' toward the upper end, so that the elastic return means 540 ' is preloaded. When the liquid pump 500 is switched to the locked state, as shown in the right side of fig. 19b, the hinge portion 543 'of the support portion 542' comes into contact with the protrusion 523, and the support portion 542 'is restored to its unbiased initial state, for example, a state of being bent at the position of the hinge portion 543' as shown in the drawing, by the elastic force of the elastic strip 541 ', so that the linear distance between both ends of the elastic strip 541' is increased. In this way, the elastic restoring means 540' is relaxed.

Fig. 20 shows a further variant of the elastic return means 540 ", in which the elastic return means 540" are shown switched between a pre-loaded state and a relaxed state. In this configuration, the support portion 542 ″ is in the form of a sheet that is easily elastically deformable. As shown in the left side of fig. 20, when the liquid pump 500 is in the open state, the contact between the support portion 542 "and the elastic strip 541" and the projection 523 is made, so that the lower end of the elastic strip 541 "is biased toward the upper end. When the liquid pump 500 is switched to the locked state, as shown in the right side of fig. 20, the portion of the support portion 542 ″ not connected to the elastic strip 541 ″ is in contact with the protruding portion 523. Thus, under the elastic force of the elastic strip 541 ", the supporting portion 542" is restored to its relaxed initial state in which the sheet-form supporting portion 542 "is bent as shown in the drawing, so that the linear distance between both ends of the elastic strip 541" is increased.

Fig. 21 shows a further alternative construction of the elastic return means 540 "'. Wherein, the supporting portion 542 "'of the elastic restoring apparatus 540"' includes a recess portion 543 "', and the recess portion 543"' is formed at a position between the portions of the supporting portion 542 "'connected to the lower end of the elastic bar 541"'. When the recessed portion 543 "'contacts the protruding portion 523 in the locked state of the liquid pump 500, the linear distance between the two ends of the elastic strip 541"' is relatively large, and when the liquid pump 500 is in use, the recessed portion 543 "'is staggered from the protruding portion 523, so that the protruding portion 523 applies an upward biasing force to the lower end of the elastic strip 541"', the linear distance between the two ends of the elastic strip 541 "'is reduced, and the elastic resetting device 540"' is preloaded.

< other modified Structure >

The foregoing description of specific embodiments of the present invention has been presented. Obvious modifications to these embodiments will be readily apparent to those skilled in the art, and such modifications are intended to be included within the scope of the present invention.

For example, in the embodiments disclosed above, either both the indenter and the mouthpiece are provided with a notch portion or both are provided with a window portion. As will be understood by those skilled in the art, the liquid pump may be provided with both the cutout portion and the window portion, as long as the elastic strip of the elastic return device is ensured to pass through the cutout portion and the window portion when deformed. For example, a notch portion may be provided on the indenter, a window portion may be provided in the mouthpiece, or vice versa; alternatively, the indenter may include both the notched portion and the window portion, and the mouthpiece may likewise include both the notched portion and the window portion.

In the above embodiment, the synchronous rotation mechanism includes the groove 142 provided on the elastic restoring means 140 and the rib 114 provided on the ram inner sleeve 112 of the ram 110. The positions of the grooves 142 and ribs 114 can be interchanged, i.e., a protrusion can be provided on the resilient return means 140 and a slot can be provided on the ram inner sleeve 112 or the piston rod.

In addition, the structure of the piston rod 450 in the fourth embodiment may also be applied to the first to third embodiments by modification, for example, the length of the ram inner sleeve of the ram in the first to third embodiments may be shortened so that the piston rod mounted on the ram extends into the interior of the ram, specifically, into the interior of the ram outer sleeve of the ram, and further, a rib/slot structure as a synchronous rotation mechanism may be provided on the piston rod.

In the above embodiment, a synchronous rotation mechanism is provided so that the elastic return means can rotate together with the ram, so that the elastic strip of the elastic return means is always aligned with the notch/window/enlargement on the ram. However, it is also possible to arrange the resilient return means so as not to rotate relative to the mouthpiece, but to align the notch/window/enlargement on the pressure head by rotating the pressure head.

In the above-described fifth embodiment, a protrusion 523 is provided on the cylinder head part 521 formed integrally with or separately from the mouthpiece 520 for cooperating with the support 542 of the elastic restoring means 540. In addition to being formed on cylinder head portion 521, the protrusion 523 may also be formed on other portions of mouthpiece 520, such as on an inner wall of mouthpiece inner sleeve 522 of mouthpiece 520, and so forth.

Claims

1. A push-on liquid pump, comprising: the pressing type liquid pump is arranged on the pressure head, the pressure head is provided with a piston rod and can rotate between a first position and a second position, when the pressure head is located at the first position, the pressing type liquid pump is located at a locking state, and when the pressure head is located at the second position, the liquid pump is located at an opening state; the tooth socket is provided with a cylinder cover part; the cylinder is connected with the tooth socket, one end of the piston rod is connected with the pressure head, and the other end of the piston rod extends into the cylinder; and an elastic reset device, which comprises at least one elastic strip and a supporting part and is arranged between the pressure head and the tooth socket, to apply an upward biasing force to the ram, the lower end of the at least one elastic strip being connected to the support portion, characterized in that a projection is provided on the mouthpiece or the cylinder head portion, against which the support portion abuts, and, a loosening structure is arranged at the bottom of the supporting part and is abutted against the protruding part in the locking state, so that a first linear distance is formed between two ends of the at least one elastic strip, and in the open state, the relaxed configuration is offset from the protrusion such that a second linear distance is present between the two ends of the at least one elastic strip, wherein the first linear distance is greater than the second linear distance.

2. The push type liquid pump as claimed in claim 1, wherein the support portion is elastically deformable and includes a connection portion connected to the lower end of the at least one elastic strip, the relief structure is formed in a portion of the support portion other than the connection portion, the relief structure abuts against the protrusion in the locked state so that the support portion assumes an initial state, and the relief structure is misaligned with the protrusion in the open state and the connection portion abuts against the protrusion so that the support portion is deformed.

3. The push type liquid pump as claimed in claim 2, wherein the relaxing structure is a hinge portion formed in a portion of the support portion other than the connecting portion.

4. The push type liquid pump as claimed in claim 2, wherein the supporting portion is a thin plate which is easily elastically deformed, and the relaxing structure is constituted by a portion of the supporting portion other than the connecting portion.

5. The push type liquid pump as claimed in claim 2, wherein the relief structure is a recess formed in a portion of the support portion other than the connecting portion.

6. The push type liquid pump as claimed in claim 1, wherein a projection is formed on the bottom of the supporting portion of the elastic restoring means, and the relaxed configuration is formed by a portion of the supporting portion other than the projection.

7. The fluid pump as defined in claim 1, wherein a first deformation receiving portion is provided on said head, said elastic strip of said elastic restoring means at least partially entering said first deformation receiving portion when said elastic strip is deformed and bent.

8. The push type liquid pump of claim 7 wherein the ram comprises a ram outer sleeve,

and, the first deformation accommodation portion includes at least one of the following structures formed on the ram outer sleeve:

at least one first notch portion, wherein in a use state, the first notch portion is aligned with a corresponding one of the elastic strips, and the elastic strip is partially passable through the first notch portion when the elastic strip is deformed;

9. The push type liquid pump of claim 7 wherein the mouthpiece includes a mouthpiece sleeve having a second deformable receptacle formed thereon, the second deformable receptacle being aligned with the first deformable receptacle.

10. The push type liquid pump of claim 9 wherein the second deformable receptacle comprises at least one of the following structures formed on the mouthpiece sleeve:

at least one second notch portion, wherein in a use state, the second notch portion is aligned with a corresponding one of the elastic strips, and the elastic strip is partially passable through the second notch portion when the elastic strip is deformed; and

at least one second window, wherein in a use state, the second window is aligned with a corresponding one of the elastic strips, and the elastic strip is partially passable through the second window when the elastic strip is deformed.

11. The push type liquid pump as claimed in any one of claims 1 to 7, further comprising a synchronous rotation mechanism configured such that the elastic restoring means can rotate together with the push head relative to the mouthpiece.

12. The push type liquid pump of claim 11 wherein the ram includes a ram inner sleeve disposed coaxially within the ram outer sleeve, the synchronous rotation mechanism comprising:

at least one rib formed on an outer surface of the ram inner sleeve or the piston rod; and

at least one groove formed on the elastic resetting device, wherein the groove is matched with the convex strip.