WO2013170615A1

WO2013170615A1 - Press-type liquid pump

Info

Publication number: WO2013170615A1
Application number: PCT/CN2012/087774
Authority: WO
Inventors: 丁要武
Original assignee: Ding Yaowu
Priority date: 2012-05-16
Filing date: 2012-12-28
Publication date: 2013-11-21
Also published as: CN103420021B; CN103420021A

Abstract

A press-type liquid pump comprising a fixed unit and a movable unit making a reciprocative movement relative to the fixed unit. The reciprocative movement is implemented jointly by a pressing force exerted by a user onto the movable unit and by a flexible resetting apparatus allowing the movable unit to reset relative to the fixed unit when the pressing force is withdrawn. In a case when no pressing force is being applied onto the movable unit, the liquid pump is capable of changing between a first position and a second position, where the flexible resetting apparatus is in an unloaded state when in the first position, and where the flexible resetting apparatus is in a preloaded state while in the second position. The liquid pump, prior to first use and when not in use, allows the flexible resetting apparatus to relax, thus preventing same from being in a loaded state for an extended period of time, and delaying the occurrence of creep and fatigue failure of the apparatus.

Description

Press type liquid pump

This invention relates to the field of liquid pumps, and more particularly to a push-type liquid pump. Background technique

The push-type liquid pump is typically mounted at the opening of the container for pumping the liquid product within the container out of the container for use by a user's manual pressing operation. The liquid pump usually has an elastic return device for returning the pressure head to its original position after the user removes the downward pressure on the pump head, and simultaneously sucks the liquid product in the container during the head reset process. The liquid pump is stored in the reservoir for the next pumping.

In conventional push-type liquid pumps, the elastic return device is typically preloaded between the active unit of the pump (usually including the indenter and piston rod) and the stationary unit (usually including the cylinder) to ensure adequate spring force. The active unit is returned to its original position relative to the fixed unit after the user removes the downward pressing force. However, the long-term loading of the elastic return device causes the creep and fatigue failure of the elastic device, and eventually the rebound force is insufficient to return the movable unit to the position, which affects the liquid discharge amount of the liquid pump.

In addition, the conventional push type liquid pump mostly uses a metal spring as an elastic returning device, as shown in Fig. 49. The metal spring 1010 used in such a liquid pump is susceptible to rust due to moisture or contact with liquid, and the rusted spring affects the quality of the product (including the quality of the spring and the quality of the liquid product in the container). Moreover, the cost of the metal spring is relatively high, and when the liquid pump is recycled, the metal spring and other plastic components need to be disassembled for separate recovery, which greatly increases the recovery cost.

Another push type liquid pump is a bellows type plastic spring pump, as shown in Fig. 50, which utilizes the elastic force generated by the deformation of the bellows 1110 to provide the power of the push type liquid pump to reset. However, such a bellows type plastic spring inherently has a problem of insufficient elastic force. In the case where the liquid product is relatively viscous or the amount of pumping liquid required is large, it is inevitable that rebounding is difficult or even impossible to rebound. The problem affects the use of consumers. In addition, in order for the liquid pump to rebound in place during use, the bellows must be preloaded so that it undergoes a certain preload deformation before use, but with prolonged placement or changes in ambient temperature The bellows spring is prone to creep, which causes the original reserved elastic deformation to disappear, resulting in a decrease in resilience. There is also a push type liquid pump which is a neck sleeve type plastic spring pump, as shown in Fig. 51.

Disclosed in US 6,223,954. A disadvantage of the spring 1210 used in such a liquid pump is that a large downforce is required to bend the spring when the indenter is near the top dead center of the pressing stroke, and when the indenter is near the dead center of the pressing stroke The resilience that the plastic spring can provide is too small, resulting in a slow reset or even a complete reset. Moreover, from the appearance, the sleeve spring is disposed above the mouthpiece of the liquid pump, so that the upper portion of the mouthpiece is particularly thick, and becomes larger after being pressed, which is very unattractive. Summary of the invention

In view of the above problems in the prior art, it is an object of the present invention to provide a push-type liquid spring which can delay creep and fatigue failure of an elastic return device.

Another object of the present invention is to provide a full plastic push type liquid pump, which can solve the problems that the metal spring is not easy to be disassembled, difficult to recover, high in cost, and easy to pollute the environment, and can solve the problem of the existing plastic spring liquid pump pressing. Feeling heavy and lack of resilience.

According to one aspect of the invention, a push-type liquid pump is provided for mounting to a container for pumping a liquid product within the container to the exterior of the container, the liquid pump comprising a fixed relative to the container And a movable unit capable of reciprocating relative to the fixed unit, wherein the liquid product is pumped to the outside of the container by the reciprocating motion, and the reciprocating motion is applied by the user at the activity a pressing force on the unit to move the movable unit relative to the fixed unit along a longitudinal axis of the liquid pump and to cause the movable unit to be along the longitudinal axis relative to the pressing force after the pressing force is removed The elastic force of the elastic reset device of the fixed unit reset is synergistically realized. The improvement of the liquid pump is that, in the absence of the pressing force applied to the movable unit, the liquid pump can be switched between a first position and a second position, in the first position The elastic reset device is in an unloaded state, and in the second position, the elastic reset device is in a preloaded state.

With the liquid pump of the present invention, the liquid pump can be in a first position in which the elastic returning device is in an unloaded state and a second position in which the elastic restoring device is in a preloaded state, in the case where no pressing force is applied to the movable unit. The conversion allows the elastic reset device to be relaxed without the use of a liquid pump, preventing it from being loaded for a long period of time, delaying the occurrence of creep and fatigue failure.

According to another aspect of the present invention, a push-type liquid pump is provided for mounting on a container to pump a liquid product in the container to the outside of the container, the liquid pump including being held relative to the container a fixed fixing unit and an active unit capable of reciprocating relative to the fixed unit Passing the reciprocating motion to effect pumping of the liquid product to the exterior of the container, the reciprocating motion being applied by the user on the movable unit such that the movable unit is along the longitudinal axis of the liquid pump relative to The pressing force of the movement of the fixed unit and the elastic force of the elastic returning device for resetting the movable unit relative to the fixed unit along the longitudinal axis after the pressing force is removed, the fixing unit includes a mouthpiece for securing the liquid pump to the container and a cylinder fixedly coupled to the mouthpiece below the mouthpiece, the movable unit including a pressure head positioned above the mouthpiece for a user to press and A piston rod connected to the indenter is fixed below the indenter. The improvement of the liquid pump is that the elastic returning device is a plastic elastic compression device mounted between the piston rod and the cylinder under the dental sleeve, the plastic elastic compression device comprising at least one substantially curved shape The elastic strip has an upper end that focuses on the piston rod and a lower end that focuses on the cylinder such that movement of the piston rod relative to the cylinder along the longitudinal axis elastically compresses the elastic strip.

The present invention also provides a push-type liquid pump for mounting to a container for pumping a liquid product in the container to the outside of the container, the liquid pump comprising a fixing unit that is fixed relative to the container and An activity unit capable of reciprocating relative to the fixed unit, the pumping of the liquid product to the outside of the container by the reciprocating motion, the reciprocating motion being applied by the user on the movable unit Pressing force of the movable unit relative to the fixed unit along the longitudinal axis of the liquid pump and for resetting the movable unit relative to the fixed unit along the longitudinal axis after the pressing force is removed The elastic force of the elastic return device is synergistically achieved, the fixation unit comprising a mouthpiece for securing the liquid pump to the container, the movable unit comprising a pressure head located above the mouthpiece for the user to press. The improvement of the liquid pump is that the elastic return device is a plastic elastic compression device mounted between the ram and the mouthpiece, the plastic elastic compression device comprising at least two evenly spaced apart around the longitudinal axis An elastic strip, the upper end of each of the elastic strips is focused on the indenter, and the lower end is focused on the mouthpiece such that movement of the indenter relative to the mouthpiece along the longitudinal axis elastically compresses the elastic strip And the line of action of the resultant force of the elastic forces generated by the elastic strips always coincides with the longitudinal axis; each of the elastic strips is generally curved, and each of the elastic strips from the upper end to the uncompressed The ratio of the length of the lower end along the length of the arc to its distance along the longitudinal axis is in the range of greater than 1 and less than π/2.

The present invention also provides a push-type liquid pump for mounting to a container for pumping a liquid product in the container to the outside of the container, the liquid pump comprising a fixing unit that is fixed relative to the container and An active unit capable of reciprocating relative to the fixed unit, by the reciprocating motion Evacuating the liquid product to the exterior of the container, the reciprocating motion being applied by the user on the movable unit to move the movable unit relative to the stationary unit along a longitudinal axis of the liquid pump The pressing force and the elastic force of the elastic returning device for resetting the movable unit relative to the fixed unit along the longitudinal axis after the pressing force is removed, the fixing unit comprising a pump for the liquid a dental sleeve fixed to the container and a cylinder bracket fixed relative to the dental sleeve, wherein the cylinder bracket is mounted with a bellows cylinder, a lower end of the bellows cylinder is fixed to the cylinder bracket, and the movable unit is located An indenter above the mouthpiece for the user to press, the upper end of the bellows cylinder being fixed relative to the indenter. The improvement of the liquid pump is that the elastic returning device is a plastic elastic compression device mounted between the cylinder bracket and the indenter under the dental sleeve, the plastic elastic compression device comprising at least one substantially arc a resilient strip having an upper end that focuses on the upper end of the bellows cylinder and a lower end that focuses on the cylinder bracket such that movement of the indenter relative to the cylinder bracket along the longitudinal axis The elastic strip is elastically compressed, and the line of action of the resultant force of the elastic force generated by the elastic strip always coincides with the longitudinal axis.

The present invention also provides a push-type liquid pump for mounting to a container for pumping a liquid product in the container to the outside of the container, the liquid pump comprising a fixing unit that is fixed relative to the container and An activity unit capable of reciprocating relative to the fixed unit, the pumping of the liquid product to the outside of the container by the reciprocating motion, the reciprocating motion being applied by the user on the movable unit Pressing force of the movable unit relative to the fixed unit along the longitudinal axis of the liquid pump and for resetting the movable unit relative to the fixed unit along the longitudinal axis after the pressing force is removed The elastic force of the elastic return device is synergistically achieved, the fixing unit comprising a dental mouthpiece for fixing the liquid pump to the container and a piston rod fixed relative to the dental sleeve, the movable unit comprising a top of the dental mouthpiece The indenter pressed by the user and the cylinder fixedly coupled to the indenter. The improvement of the liquid pump is that the elastic returning device is a plastic elastic compression device mounted between the cylinder and the piston rod under the dental sleeve, the plastic elastic compression device comprising at least one substantially curved shape An elastic strip, the upper end of the elastic strip is focused on the cylinder, and the lower end is focused on the piston rod such that movement of the cylinder relative to the piston rod along the longitudinal axis elastically compresses the elastic strip, And the line of action of the resultant force of the elastic force generated by the elastic strip always coincides with the longitudinal axis.

By using the above-mentioned liquid pump of the present invention, since the elastic reset device made of plastic is used, the problem that the metal spring is difficult to be disassembled, difficult to recover, high in cost, and easy to pollute the environment is solved. Due to the use of the elastic resetting device in the form of an arc-shaped elastic strip, the problem of the heavy pressure and the resilience of the existing plastic spring liquid pump is also solved.

In addition, the elastic return device of the present invention is disposed at a position below the mouthpiece, which is concealed in the product container in normal use, and is not exposed, thereby not only preventing the elastic return device from being damaged by external impact, but also It also helps to improve the aesthetics of the product container in which the liquid pump is installed.

Other features and advantages of the invention will be apparent from the description of the exemplary embodiments. DRAWINGS

BRIEF DESCRIPTION OF THE DRAWINGS Figure 1 is a cross-sectional view showing a push type liquid pump in a state of a lock head (indenter lock) according to a first embodiment of the present invention;

Figure 2 is a cross-sectional view of the liquid pump of Figure 1 in an unlocked state;

Figure 3 is a cross-sectional view of the liquid pump of Figure 1 in a depressed state;

Figure 4 is an exploded perspective view of the liquid pump shown in Figure 1;

Figure 5 is a different view of the elastic reset device of the liquid pump shown in Figure 1;

Figure 6 is a different view of the piston rod of the liquid pump of Figure 1, the piston rod including the cam action mechanism of the present invention;

Figure 7 is a different view of the cylinder of the liquid pump of Figure 1;

Figure 8 is a cross-sectional view showing a push-type liquid pump in a state of a lock according to a second embodiment of the present invention; Figure 9 is a cross-sectional view showing the liquid pump of Figure 8 in an unlocked state;

Figure 10 is a cross-sectional view showing the liquid pump of Figure 8 in a depressed state;

Figure 11 is a different view of the elastic reset device of the liquid pump shown in Figure 8;

Figure 12 is a different view of the cylinder of the liquid pump of Figure 8;

Figure 13 is a cross-sectional view showing the push-type liquid pump in a state of a lock according to a third embodiment of the present invention; Figure 14 is a cross-sectional view showing the liquid pump of Figure 13 in an unlocked state;

Figure 15 is a cross-sectional view showing the liquid pump of Figure 13 in a depressed state;

Figure 16 is a different view of the bellows of the liquid pump shown in Figure 13;

Figure 17 is a different view of the elastic reset device of the liquid pump shown in Figure 13;

Figure 18 is a different view of the cylinder of the liquid pump of Figure 13, the cylinder including another form of cam action mechanism of the present invention; Figure 19 is a cross-sectional view showing a push-type liquid pump in a state of a lock according to a fourth embodiment of the present invention; Figure 20 is a cross-sectional view showing the liquid pump of Figure 19 in an unlocked state;

Figure 21 is a cross-sectional view showing the liquid pump of Figure 19 in a depressed state;

Figure 22 is a different view of the piston head of the liquid pump shown in Figure 19;

23a-d are different views of the elastic returning device of the liquid pump of Fig. 19, which together with the piston head of Fig. 22 also constitute a cam acting mechanism of still another form of the present invention;

Figure 23e is a perspective view of a variation of the elastic returning device shown in Figures 23a-d;

Figure 24 is a different view of another variation of the elastic returning device of Figure 23;

Figure 25 is a cross-sectional view showing a push-type liquid pump in a state of a lock according to a fifth embodiment of the present invention; Figure 26 is a cross-sectional view showing the liquid pump of Figure 25 in a depressed state;

Figure 27a-d are different views of the elastic resetting device of the liquid pump shown in Figure 25;

Figure 27e-f is a different view of a modification of the elastic returning device shown in Figures 27a-d; Figure 28 is a cross-sectional view of the push-type liquid pump in a locked state according to a sixth embodiment of the present invention;

Figure 29 is a cross-sectional view showing the liquid pump of Figure 28 in a depressed state;

Figure 30 is a different view of the elastic returning device of the liquid pump shown in Figure 28;

Figure 31 is a different view of a variation of the elastic returning device of Figure 30;

Figure 32 is a different view of the cylinder of the liquid pump shown in Figure 28;

Figure 33 is a side elevational view of the push-type liquid pump in a locked state in accordance with a seventh embodiment of the present invention; Figure 34 is a side elevational view of the liquid pump of Figure 33 in an unlocked state;

Figure 35 is a cross-sectional view showing the liquid pump of Figure 33 in a depressed state;

Figure 36 is a different view of the elastic reset device of the liquid pump shown in Figure 33, the elastic reset device; Figure 37 is a cross-sectional view of the push-type liquid pump in a lock state according to the eighth embodiment of the present invention;

Figure 38 is a side elevational view of the liquid pump of Figure 37 in an unlocked state;

Figure 39 is a cross-sectional view showing the liquid pump of Figure 37 in a depressed state;

Figure 40 is a different view of the piston rod of the liquid pump shown in Figure 37;

Figure 41 is a different view of the elastic tension spring bracket of the liquid pump of Figure 37, which together with the piston rod of Figure 37 also constitutes a cam action mechanism of still another form of the present invention;

Figure 42 is an assembly view of the piston rod, the elastic tension spring bracket and the elastic tension spring of the liquid pump shown in Figure 37; Intention

Figure 43 is a cross-sectional view showing the push type liquid pump in an unpressed state according to a ninth embodiment of the present invention;

Figure 44 is a cross-sectional view showing the liquid pump of Figure 43 in a depressed state;

Figure 45 is a perspective view of the elastic reset device of the liquid pump shown in Figure 43;

Figure 46 is a perspective view of the cylinder holder of the liquid pump shown in Figure 43;

Figure 47 shows different elevational shapes of the elastic strips that can be used in the elastic return device of the present invention; Figure 48 shows different cross-sectional shapes of the elastic strips that can be used in the elastic return device of the present invention; Figure 49 is a prior art a cross-sectional view of a push-type liquid pump;

Figure 50 is a cross-sectional view of another prior art push type liquid pump;

Figure 51 is a cross-sectional view of still another prior art push type liquid pump. detailed description

First, hereby, by the way, "upper" and "lower" as described herein are placed in a vertical orientation relative to the liquid pump (ie, the direction in which the liquid pump is set to its longitudinal axis coincides with the vertical direction) And ok.

First embodiment

Referring to Figures 1 to 7, there is shown a push type liquid pump of a first embodiment of the present invention. The push-type liquid pump is mounted to a container (not shown) to pump the liquid product in the container to the outside of the container. In general, the liquid pump includes a stationary unit that is fixed relative to the container and a movable unit that is reciprocable relative to the stationary unit by which pumping of the liquid product to the exterior of the container is achieved. The reciprocating motion is applied by the user to the movable unit to press the movable unit relative to the fixed unit along the longitudinal axis A of the liquid pump and to remove the movable unit relative to the fixed unit along the longitudinal axis A after the pressing force is removed The elastic force of the reset elastic reset device is synergistically realized. In this embodiment, the fixation unit includes a mouthpiece 140 for securing the liquid pump to the container and a cylinder 130 fixedly coupled to the mouthpiece 140 below the mouthpiece 140, and the movable unit includes an indenter positioned above the mouthpiece 140 for the user to press 120 and a piston rod 150 fixedly coupled to the indenter under the indenter 120.

In accordance with one aspect of the invention, the elastic return device is a plastic compression device 110 that is mounted between the piston rod 150 and the cylinder 130 below the mouthpiece 140, the plastic elastic compression device 110 including two symmetrically disposed about the longitudinal axis A. Elastic strip 111, the upper end of each elastic strip 111 is focused On the piston rod 150, and the lower end is focused on the cylinder 130, so that the movement of the piston rod 150 along the longitudinal axis A relative to the cylinder 130 elastically compresses the elastic strip 111, and the line of action of the resultant force of the elastic force generated by the elastic strip 111 is always with the longitudinal axis. A coincides. Since the elastic compression device is made of plastic, the liquid pump can be free of any metal material, which is very advantageous for product recovery. In addition, by arranging the elastic compression device 110 at a position below the mouthpiece 140, the elastic compression device can be prevented from being exposed to the outside of the liquid pump and the container, thereby improving the overall aesthetics of the product.

Each of the elastic strips 111 has an arc shape, and preferably, when uncompressed, the ratio of the length of each of the elastic strips 111 from the upper end to the lower end thereof along the length of the curved line in the direction of the longitudinal axis A is greater than 1. It is less than π/2. Such an arc structure helps to obtain a higher elastic utilization rate of the elastic strip, and does not appear to be excessively required for the elastic strip near the top dead center of the pressing stroke and is provided by the elastic strip near the lower end of the pressing stroke. The situation is too small.

Due to the curved shape, each elastic strip 111 is adapted to deform in the plane in which the arc is located. In this embodiment, the plane of deformation is the plane through the longitudinal axis Α. Each of the elastic strips has a substantially semi-circular cross section, as shown in Figure 5e, but may be other suitable shapes.

The lower ends of the two elastic strips 111 are fixed to the base 112, which is formed with a central through hole 113 for the passage of the piston rod 150. The susceptor 112 is also used as a cylinder plug that seals the opening of the cylinder 130.

The cylinder 130 is substantially cylindrical, and an upper end thereof is formed with an annular flange 133 for fixing to the opening of the container through the mouthpiece 140. The lower portion of the cylinder 130 forms a reservoir 131 for storing the liquid product sucked from the container. The upper portion of the cylinder 130 is formed with hollow portions 132 which are diametrically opposed to each other for deforming the elastic strip 111 of the elastic compression device 110 radially outward as shown in Fig. 3.

According to another aspect of the invention, the liquid pump can be in the first position (or state) in the absence of a pressing force applied to the movable unit (i.e., the indenter 120 and the piston rod 150), that is, in the unused state. And switching between the second position in which the elastic compression device 110 is in an unloaded state, and in the second position, the elastic compression device is in a preloaded state. In this embodiment, the conversion of the liquid pump between the first position and the second position is accomplished by rotating the ram 120 and the piston rod 150 90 degrees about the longitudinal axis A relative to the mouthpiece 140.

The piston rod 150 is formed with a flange 151 having bearing faces 152 and 153 at different heights in the direction of the longitudinal axis A. In this embodiment, the support surface 152 at a higher height and the support surface 153 at a lower height are each divided into two sections which are opposed to each other in the diametrical direction of the piston rod 150, The support surface 152 and the support surface 153 are offset from each other by 90 degrees in the rotational direction of the piston rod 150. The bearing faces 152 and 153 are for engaging the upper ends of the elastic strips 111 of the elastic compression device 110 to serve as the upper point of the elastic compression device. There is a bevel for the transition between the bearing surface 152 and the bearing surface 153 so that the upper end of the elastic strip 111 is transferred between the two bearing surfaces.

When the support surface 152 at a higher height is engaged with the upper ends of the two elastic strips 111, the elastic strip

The 111 is in a relaxed state such that the elastic compression device 110 is in an unloaded state. When the piston rod 150 is rotated 90 degrees so that the lower bearing surface 153 is engaged with the upper ends of the two elastic strips 111, the elastic strips 111 are slightly compressed, so that the elastic compression device 110 is in a preloaded state.

In this embodiment, the flange 151 having the bearing faces 152 and 153 corresponds to a cam member which, together with the upper end of the elastic compression device 110, constitutes a camming mechanism responsive to the movable unit (indenter 120 and The rotation of the piston rod 150) about the longitudinal axis causes the elastic compression device 110 to compress or expand longitudinally.

Two protruding ribs 54 are formed on the piston rod 150 at positions corresponding to the lower-level bearing surface 153, and the protruding ribs can correspond to the two formed by the plugs in the central through-hole 113 of the base 112 of the elastic compression device 110. The groove 113 cooperates to prevent the ram 120 from being depressed when the rib 154 is offset from the groove 113 (when the liquid pump is in the lock state), and allows the pressure when the rib 154 is aligned with the groove 113. The head 120 is depressed (the liquid pump is now unlocked). In this embodiment, the first position of the elastic compression device in the unloaded state corresponds to the state of the lock, and the second position of the elastic compression device in the preloaded state corresponds to the unlocked state.

When the liquid pump is not in use, the ram 120 (i.e., the piston rod 150) can be rotated to the lock state, so that the liquid pump is in the first position where the elastic compression device 110 is not loaded, so that the elastic compression device 110 can be relaxed. When the liquid pump is required to be used, the ram 120 can be rotated to the unlocked state, so that the liquid pump is in the second position in which the elastic compression device 110 is preloaded, thereby facilitating the elastic compression device 110 to apply a restoring force to the piston rod 150. .

In addition, the liquid pump has other components such as a piston 60 and a one-way ball valve 70, which are well known in the art. All parts of the liquid pump can be made of plastic material for easy recycling.

Second embodiment

Referring now to Figures 8-12, there is shown a push-type liquid pump in accordance with a second embodiment of the present invention. The general structure of the push type liquid pump is substantially the same as that of the first embodiment. Specifically, the liquid pump generally includes components such as a plastic elastic compression device 210, a ram 220, a cylinder 230, a mouthpiece 240, and a piston rod 250. Unlike the first embodiment, the lower end of the elastic compression device 210 includes a base 212 that connects the lower end of the elastic strip 211. The base is in the form of a ring that supports the tab 234 formed on the outer periphery of the lower portion of the cylinder 230. on. In this case, a separate cylinder plug 235 is required to seal the opening of the cylinder, and the cylinder plug 235 is formed with a center through hole through which the piston rod 250 passes.

As shown in Fig. 12, the upper portion of the cylinder 230 is formed with hollow portions which are diametrically opposed to each other.

232, for allowing the two elastic strips 211 of the elastic compression device 210 to pass from the inside of the cylinder to the outside of the cylinder.

With this embodiment, since the lower end of the elastic compression device 210 is focused on the lower portion of the cylinder 230, instead of focusing on the opening portion of the upper portion of the cylinder as in the first embodiment, it is not necessary to make the length of the cylinder Long to ensure that the elastic compression device has a sufficiently long elastic strip. In this way, the length of the cylinder can be shortened and the length of the entire liquid pump can be shortened.

Third embodiment

Referring next to Figures 13-18, there is shown a push type liquid pump of a third embodiment of the present invention. The liquid pump generally includes components such as a plastic elastomeric compression device 310, a ram 320, a bellows cylinder 330, a braces 340, and a cylinder bracket 345. In the liquid pump, the movable unit includes a ram 320, and the fixed unit includes a mouthpiece 340 and a cylinder holder 345 integrally formed with the mouthpiece.

The plastic elastic compression device 310 includes two arc-shaped elastic strips 311 symmetrically disposed about the longitudinal axis A of the liquid pump and a base 312 connecting the upper ends of the two elastic strips 311. Each of the elastic strips 311 is adapted to deform in the plane of the arc and the plane passes through the longitudinal axis A. Such a configuration causes the line of action of the resultant force of the elastic force generated by the elastic strip 311 to always coincide with the longitudinal axis A. The base 312 has an upwardly extending connecting sleeve 315 for drivingly coupling with a downwardly extending connecting conduit 321 formed on the ram 320 so that rotation of the ram 320 can drive elastic compression. Device 310 rotates. The lower end of the elastic strip 311 is formed with a guiding bevel 316 in the same rotational direction about the longitudinal axis, which serves as a cam surface as will be described later.

The upper end 331 of the bellows cylinder 330 is coupled to the base 312 of the elastic compression device 310, and the lower end 332 is fixed to the cylinder bracket 345 such that the bellows cylinder 330 can be expanded and contracted with the up and down movement of the indenter 320, thereby achieving pumping action. .

As shown in Fig. 18, the cylinder holder 345 includes a substantially circular bottom plate 346 having two through holes 347 formed in the diametrical direction of the circular bottom plate. The through hole 347 is sized to allow the elastic strip 311 of the elastic compression device 310 to pass.

In the first position of the liquid pump, the indenter 320 is in a locked state, ie, not in relation to the mouthpiece 340 Pressed down (the specific structure is not mentioned here). At this time, the elastic strip 311 of the elastic compression device 310 slightly protrudes from the through hole 347 formed in the bottom plate 346 of the cylinder holder 345, and thus is in an unloaded state. When the ram 320 is rotated by an angle (e.g., 90 degrees) to switch the liquid pump from the first position to the second position, the ram 320 is shifted to the unlocked position, i.e., can be pressed downward relative to the mouthpiece 340. At this time, the elastic compression device 310 is rotated correspondingly such that the lower end of the elastic strip 311 is removed from the through hole 347 under the guidance of the guiding slope 316, and abuts against the upper surface of the bottom plate 346 to slightly compress the elastic strip 311. . Thus, the elastic compression device 310 is switched to the preloaded state.

In this embodiment, the bottom plate of the cylinder holder 345 having the through hole 347 and the lower end of the elastic compression device 310 with the guiding bevel 316 constitute a camming mechanism that surrounds the longitudinal direction in response to the movable unit (indenter 320). The rotation of the axis A causes the elastic compression device 310 to compress or expand longitudinally.

In the second position in which the elastic compression device 310 is in the preloaded state, the ram 320 can reciprocate under the action of the pressing force applied by the user and the upward return of the elastic compression device 310, thereby implementing the pumping function.

Fourth embodiment

Referring now to Figures 19-24, there is shown a push-type liquid pump in accordance with a fourth embodiment of the present invention. Similar to the structure of the above-described embodiment, the push-type liquid pump generally includes a fixed unit that is fixed relative to the container and a movable unit that can reciprocate relative to the fixed unit, by which the liquid product is made to the outside of the container. Pumping. In this embodiment, the fixation unit includes a mouthpiece 440 for securing the liquid pump to the container and a cylinder 430 fixedly coupled to the mouthpiece below the mouthpiece 440, and the movable unit includes an indenter positioned above the mouthpiece 440 for the user to press 420 and a piston rod 450 attached to the ram under the ram 420.

The elastic return device is a plastic compression device 410 made of plastic that is mounted between the piston rod 450 and the cylinder 430 under the mouthpiece 440. Specifically, the elastic compression device 410 is housed in the cylinder 430 with its lower end abutting against the lower end of the cylinder 430 and its upper end abutting against the lower end of the piston rod 450. The plastic elastic compression device 410 includes two elastic strips 411 symmetrically disposed about a longitudinal axis A. The upper ends of each of the elastic strips 411 are connected by an upper base 412a in the form of a ring, and the lower end is connected by a lower base 412b in the form of a ring. The movement of the piston rod 450 in the longitudinal axis A direction relative to the cylinder 430 elastically compresses the elastic strip 411, and the line of action of the resultant force of the elastic force generated by the elastic strip 411 always coincides with the longitudinal axis A.

Each of the elastic strips 411 has a radially inwardly concave arc shape, and preferably, when uncompressed, each The ratio of the length of the root elastic strip 411 from the upper end to the lower end along the length of the arc and its distance in the longitudinal axis A direction is in a range of more than 1 and less than π/2. When compressed, the two elastic strips 411 are deformed in the same plane through the longitudinal axis Α.

The ring of the lower base 412b is generally rectangular, and the ring of the upper base 412a is generally circular. The ring of the lower base 412b extends generally in a plane, but the rings of the upper base 412a do not extend in the same plane. Specifically, the ring of the upper base 412a has two bearing faces 413 at a higher height in the direction of the longitudinal axis A and two bearing faces 414 at a lower height, the bearing faces 413 and the bearing faces 414 in the direction of rotation The phase difference is approximately 90 degrees. Moreover, the higher bearing surface 413 and the lower bearing surface 414 are more smoothly connected by the transition ramp.

In the case where no pressing force is applied to the movable unit (ie, the indenter 420 and the piston rod 450), that is, in the unused state, the liquid pump can be switched between the first position and the second position, at the first In position, the resilient compression device 410 is in an unloaded state, and in the second position, the resilient compression device 410 is in a preloaded state. In this embodiment, the conversion of the liquid pump between the first position and the second position is accomplished by rotating the indenter 420 and the piston rod 450 about the longitudinal axis A by approximately 90 degrees relative to the mouthpiece 440.

The piston rod 450 includes a piston head 451 at its lower end which is generally T-shaped as shown in FIG. The piston head 451 includes an engaging rod portion 453 at a lower portion thereof and a connecting barrel portion 452 at an upper portion thereof. The connecting barrel portion 452 is for connection with the main body portion of the piston rod 450. The engaging rod portion 453 is formed at its lower side and at both ends of the rod with a joint portion 454 for engaging the upper base 412a of the elastic compression device 410. When the liquid pump is in the first position, i.e., the lock state, the engagement portion 454 of the piston head 451 of the piston rod 450 engages the lower bearing surface 414 of the upper base 412a of the resilient compression device 410, thus causing the elastic compression device 410. The elastic strip 411 is relaxed, and thus the elastic compression device 410 is in an unloaded state. When the ram 420 and the piston rod 450 are rotated 90 degrees to switch the liquid pump from the first position to the second position, the engaging portion 454 of the piston rod 450 engages with the higher bearing surface 413 of the elastic compression device 410, thus The elastic strip 411 is compressed, and thus the elastic compression device 410 is in a preloaded state.

In this embodiment, the upper surfaces of the bearing surfaces 413 and 414 having different heights of the elastic compression device 410 constitute a cam surface, and the engaging portion 454 of the cam surface and the lower end of the piston rod 450 constitutes a cam action mechanism. The mechanism compresses or stretches the elastic compression device 410 longitudinally in response to rotation of the movable unit (indenter 420 and piston rod 450) about the longitudinal axis A.

In the second position where the elastic compression device 410 is in the preloaded state, the indenter 420 can The pressing action applied by the user and the upward recovery of the elastic compression device 410 reciprocate to achieve the pumping function.

Figure 23e shows a variation of the elastic compression device of the fourth embodiment. In this variation of the elastic compression device 410', four elastic strips 411' are equally spaced around the circumferential direction, and the lower base 412b' is also circular as the upper base 412a'.

Figure 24 shows yet another variation of the elastic compression device. In the elastic compression device 410" of this variation, the configuration of the upper base 412a" and the lower base 412b" is the same as that of the fourth embodiment, except that the two elastic strips 411 are disposed in response to the pressing The elastic deformation of the pressure P is not in the plane passing through the longitudinal axis, that is, the two elastic strips 411" are respectively deformed in different planes, which allows the two elastic strips 411 to have a greater degree of deformation which overlap each other. , as shown in Figure 24c. Of course, the two elastic strips 411" are still symmetrically arranged about the longitudinal axis A such that the resultant line of force of the resultant spring always coincides with the longitudinal axis A.

Fifth embodiment

Referring next to Figures 25-27, there is shown a push type liquid pump of a fifth embodiment of the present invention. The general structure of the liquid pump is similar to that of the fourth embodiment except that the liquid pump does not have a function of switching the elastic compression device between the unloaded state and the preloaded state, and the structure of the elastic compression device is also different.

Specifically, the liquid pump generally includes components such as an elastic compression device 510, a pressure head 520, a cylinder 530, a mouthpiece 540, and a piston rod 550. The piston rod 550 has a piston head 551 that engages the resilient compression device 510. Since the liquid pump does not have a function of switching the elastic compression device between the unloaded state and the preloaded state, the piston rod 550 and the elastic compression device 510 do not need to have the cam action mechanism in the fourth embodiment.

Moreover, in this embodiment, the structure of the elastic compression device is also different from that of the fourth embodiment. As shown in Figures 27a-27d, the elastic compression device 510 comprises two arcuate elastic strips 511 arranged symmetrically about a longitudinal axis A, the upper and lower ends of which are connected together and adapted to pass through the longitudinal direction. The axis A is deformed in the same plane. Such a configuration causes the line of action of the resultant force of the elastic force generated by the elastic strip 511 to always coincide with the longitudinal axis A. Moreover, the lower ends of the two elastic strips 511 are fixed to a base 512. The base 512 includes a ring and a diametrically extending crossbar to which the lower end of the elastic strip 511 is fixed. In the mounted state, the upper ends of the elastic strips 511 of the elastic compression device 510 are coupled to abut the lower end of the piston head 551 of the piston rod 550, and the base 512 of the elastic compression device 510 is supported at the lower circular end of the cylinder 530. on. As shown in Figure 26, when the indenter 520 When pressed by the user, the piston rod 550 as the movable unit and the pressure head 520 move downward with respect to the socket 540 and the cylinder 530 as the fixed unit, and thus the elastic compression device 510 is elastically compressed and deformed, thereby applying a response to the piston rod. force.

Figures 27e and 27f show a variation of the elastic compression device of the fifth embodiment. In this variation, four elastic strips 51 are included, the upper ends of which are joined together, and the lower end of each elastic strip is connected to the annular base 512 by a radially extending crossbar. Each of the elastic strips 51 变形 can be deformed in the same plane passing through the longitudinal axis A.

Sixth embodiment

Referring next to Figures 28-32, there is shown a push type liquid pump of a sixth embodiment of the present invention. The general structure of the liquid pump is similar to that of the second embodiment except that the liquid pump does not have a function of switching the elastic compression device between the unloaded state and the preloaded state, and the structure of the elastic compression device and the cylinder is also different.

Specifically, the liquid pump generally includes components such as an elastic compression device 610, a pressure head 620, a cylinder 630, a mouthpiece 640, and a piston rod 650. Since the liquid pump does not have the function of switching the elastic compression device between the unloaded state and the preloaded state, the piston rod 650 does not have the camming mechanism in the second embodiment.

Moreover, in this embodiment, the structure of the elastic compression device is also different from that of the second embodiment. As shown in Figures 30a and 30b, the resilient compression device 610 includes only one arcuate resilient strip 611 adapted to deform in the same plane through the longitudinal axis A. The upper and lower ends of the elastic strip are respectively connected with a circular upper base 612a and a lower base 612b. The upper base 612a is sleeved on the piston rod 650 and abuts against a flange 651 formed on the piston rod. The lower base 612b is sleeved on the lower portion of the cylinder 630 and abuts against the tab 634 formed on the outer circumference of the cylinder 630. In this embodiment, since the upper end and the lower end of the elastic strip 611 abut against the piston rod 650 and the cylinder 630 through the annular bases 612a and 612b, respectively, the action line of the elastic force generated by the single elastic strip is always It coincides with the longitudinal axis A.

Figures 31a and 31b show a variation of the elastic compression device, wherein the elastic compression device 610' includes an elastic strip 61 Γ and an upper base 612a' and a lower base respectively connected to the upper and lower ends of the elastic strip, respectively 612b'. The upper base 612a' and the lower base 612b' each have an incomplete annular shape, i.e., a C shape.

Further, unlike the second embodiment, the cylinder 630 includes only one hollow portion 632 for allowing the single elastic strip 611 of the elastic compression device 610 to pass from the inside of the cylinder to the outside of the cylinder, as shown in FIG. Seventh embodiment

Referring now to Figures 33-36, there is shown a push-type liquid pump of a seventh embodiment of the present invention. As with the above embodiment, the liquid pump includes a fixed unit that is fixed relative to the container and a movable unit that can reciprocate relative to the fixed unit, wherein the fixed unit includes a mouthpiece 740 and a cylinder 730 fixed to the underside of the mouthpiece, and the movable unit A pressure head 720 and a piston rod 750 fixedly coupled to the pressure head are included.

A plastic elastic compression device 710 is mounted between the indenter 720 and the mouthpiece 740 as an elastic return device for resetting the movable unit relative to the fixed unit. The movement of the indenter 720 relative to the mouthpiece 740 in the longitudinal axis A direction causes elastic compression deformation of the elastic compression device such that the elastic compression device applies a restoring force to the indenter to reset the movable unit relative to the fixed unit. The elastic compression device 710 includes two arcuate elastic strips 711 symmetrically arranged about the longitudinal axis A, the upper ends of which are connected to the upper base 712a in the form of a ring, and the lower end is connected to the lower base 712b in the form of a ring, and is adapted to pass The longitudinal axis A is deformed in the same plane. Such a configuration causes the line of action of the resultant force of the elastic force generated by the elastic strip 711 to always coincide with the longitudinal axis A. The inner ring of the ring of the lower base 712b is formed with a plurality of teeth to prevent the lower base 712b and thus the entire elastic compression device 710 from being opposed when the ring is fitted over the toothed annular projection 741 formed on the upper surface of the mouthpiece 740. The braces 740 are rotated.

Thus, the upper end of the elastic strip 711 of the elastic compression device 710 is focused on the indenter 720, and the lower end is focused on the mouthpiece 740 such that the movement of the indenter 720 along the longitudinal axis A relative to the mouthpiece 740 causes the elastic strip 711 to elastically compress, and The line of action of the elastically compressive force of the elastic strip 711 is always collinear with the longitudinal axis A, that is, the line of action of the resultant force of the elastic forces generated by all of the elastic strips 711 always coincides with the longitudinal axis A.

Each of the elastic strips 711 has a radially outwardly concave arc shape, and when uncompressed, the ratio of the distance of each of the elastic strips 711 from the upper end to the lower end along the length of the arc and its distance along the longitudinal axis A is greater than 1 is less than π/2.

The rings of the lower base 712b are generally circular in shape and extend generally in the same plane, while the rings of the upper base 712a do not extend in the same plane. Specifically, the ring of the upper base 712a has two support faces 713 at a higher height in the direction of the longitudinal axis A and two support faces 714 at a lower height, the support faces 713 and the support faces 714 in the direction of rotation The phase difference is approximately 90 degrees. Moreover, between the higher bearing surface 713 and the lower bearing surface 714, the smoother connection is made by the slope.

In the case where no pressing force is applied to the movable unit (ie, the indenter 720 and the piston rod 750), that is, in the unused state, the liquid pump can be switched between the first position and the second position, at the first Bit Centered, the elastic compression device 710 is in an unloaded state, and in the second position, the elastic compression device

710 is in a preloaded state. In this embodiment, the conversion of the liquid pump between the first position and the second position is accomplished by rotating the ram 720 and the piston rod 750 relative to the mouthpiece 740 about the longitudinal axis A by approximately 90 degrees.

The ram 720 has two projections 721 on its lower side that are configured to engage the upper base 712a of the elastic compression device 710. When the liquid pump is in the first position, i.e., the lock state, the projection 721 of the ram 720 engages the lower bearing surface 714 of the upper base 712a of the elastic compression device 710, thus relaxing the elastic strip 711 of the elastic compression device 710. Thus, the elastic compression device 710 is in an unloaded state. When the ram 720 is rotated 90 degrees relative to the mouthpiece 740 to switch the liquid pump from the first position to the second position, the protrusion 721 of the ram 720 engages the upper bearing surface 713 of the upper base 712a of the elastic compression device 710. Thus, the elastic strip 711 is compressed, and thus the elastic compression device 710 is in a preloaded state.

In this embodiment, the upper surfaces of the support surfaces 713 and 714 of the elastic compression device 710 having different heights constitute a cam surface, and the cam surface and the protrusion 721 of the ram 720 constitute a cam action mechanism, and the cam action mechanism responds. The elastic compression device 710 is longitudinally compressed or stretched relative to the rotation of the movable unit (indenter 720 and piston rod 750) relative to the fixed unit (breast 740) about the longitudinal axis A.

In the second position in which the elastic compression device 710 is in the preloaded state, the indenter 720 can reciprocate under the pressing action applied by the user and the upward return of the elastic compression device 710 to effect the pumping function.

Eighth embodiment

Referring next to Figures 37-42, there is shown a push type liquid pump of an eighth embodiment of the present invention. As with the above embodiment, the liquid pump includes a fixed unit that is fixed relative to the container and a movable unit that can reciprocate relative to the fixed unit, wherein the fixed unit includes a mouthpiece 840 and a cylinder 830 fixed to the underside of the mouthpiece, and the movable unit A pressure head 820 and a piston rod 850 fixedly coupled to the pressure head are included.

An elastic returning device is mounted between the cylinder 830 and the piston rod 850 for resetting the movable unit relative to the stationary unit after the user removes the pressing action. Different from the above embodiment, the elastic returning device in this embodiment is an elastic stretching device 810. The movement of the indenter 820 and the piston rod 850 relative to the braces 840 and the cylinder 830 in the direction of the longitudinal axis A causes the elastic stretching device to elastically stretch and deform, so that the elastic stretching device 810 applies a restoring force to the indenter 820 and the piston rod 850. , resetting the active unit relative to the fixed unit. The elastic stretching device 810 includes four elastic strips 811 evenly spaced about the longitudinal axis A, the upper ends of which are coupled to the upper base 812a in the form of a ring and the lower end to the lower base 812b in the form of a ring. The upper base 812a is fixed to an upper end portion of the cylinder 830 (for example, a cylinder plug), and the lower base 812b is coupled to the piston rod 850 via a bracket 855. Such a configuration causes the line of action of the resultant force of the elastic force generated by the elastic strip 811 to always coincide with the longitudinal axis A.

The bracket 855 is generally cylindrical and sleeved on the piston rod 850. The lower end of the bracket 855 is engaged with the lower base 812b of the elastic stretching device 810, and the upper end is engaged with a pair of projections 851 formed on the piston rod 850. The pair of projections 851 project from the outer peripheral surface of the piston rod 850 in the diametrical direction. As shown in Fig. 41, the upper end of the bracket 855 has two bearing faces 856 at a higher height in the direction of the longitudinal axis A and two bearing faces 857 at a lower height, the bearing faces 856 and the bearing faces 857 are rotating The phase difference in the direction is approximately 90 degrees. Moreover, the upper support surface 856 and the lower support surface 857 are relatively smoothly connected by the inclined surface.

In the case where no pressing force is applied to the movable unit (ie, the indenter 820 and the piston rod 850), that is, in the unused state, the liquid pump can be switched between the first position and the second position, at the first In position, the elastic stretching device 810 is in an unloaded state having a length H, and in the second position, the elastic stretching device 810 is in a preloaded state, the length of which is extended to H1. In this embodiment, the conversion of the liquid pump between the first position and the second position is accomplished by rotating the ram 820 and the piston rod 850 about the longitudinal axis A by approximately 90 degrees relative to the cuff 840 and the cylinder 830.

When the liquid pump is in the first position, that is, the lock state, the projection 851 of the piston rod 850 is engaged with the lower bearing surface 857 of the upper end of the bracket 855, so that the elastic strip 811 of the elastic stretching device 810 is relaxed, thereby being elastic The stretching device 810 is in an unloaded state. When the ram 820 is rotated 90 degrees relative to the mouthpiece 840 to switch the liquid pump from the first position to the second position, the projection 851 of the piston rod 850 engages the higher bearing surface 856 of the bracket 855, thus causing the elastic strip The 811 is stretched, and thus the elastic stretching device 810 is in a preloaded state.

In this embodiment, the brackets 855 of the elastic stretching device 810 having the bearing surfaces 856 and 857 of different heights and the projections 851 of the piston rod 850 constitute a camming mechanism that responds to the movable unit (indenter) The 820 and the piston rod 850) longitudinally contract or extend the elastic stretching device 810 relative to the rotation of the fixed unit (the mouthpiece 840 and the cylinder 830) about the longitudinal axis A.

In the second position in which the elastic stretching device 810 is in the preloaded state, the indenter 820 can reciprocate under the pressing action applied by the user and the upward recovery of the elastic stretching device 810. And realize the pump pressure function. When the ram 820 is pressed down to the pressing stroke bottom dead center position, as shown in Fig. 39, the length of the elastic stretching device 810 reaches the maximum H2, at which time the elastic restoring force applied thereto also reaches the maximum.

Ninth embodiment

Referring next to Figures 43-46, there is shown a push type liquid pump of a ninth embodiment of the present invention. As with the above embodiment, the liquid pump includes a fixed unit that is fixed relative to the container and a movable unit that is reciprocable relative to the fixed unit, wherein the fixed unit includes a mouthpiece 940 and a piston rod 950 that is fixed to the mouthpiece by the piston rod bracket 945. And the movable unit includes a pressure head 920 and a cylinder 930 fixedly coupled to the pressure head.

Below the mouthpiece 940, an elastic compression device made of plastic is mounted between the cylinder 930 and the piston rod 950 for resetting the movable unit relative to the fixed unit after the user removes the pressing action. The elastic compression device 910 comprises two elastic strips 911 arranged symmetrically about a longitudinal axis A. The upper ends of the two elastic strips 911 are connected together by an upper base 912a in the form of a ring, and the lower end is connected to the lower base 912b in the form of a ring. Together, as shown in Figure 45. Such a configuration causes the line of action of the resultant force of the elastic force generated by the elastic strip 911 to always coincide with the longitudinal axis A. Preferably, each of the elastic strips 911 has an outwardly concave arc shape, and when uncompressed, the distance of each of the elastic strips 911 from the upper end to the lower end thereof along the length of the arc and the direction along the longitudinal axis A The ratio is in the range of more than 1 and less than π/2. In this embodiment, the deformation of the two elastic strips 911 is in the same plane through the longitudinal axis.

In the mounted state, the upper end of the elastic compression device 910 focuses on the cylinder 950, and the lower end focuses on the cylinder 930, such that the movement of the cylinder 930 along the longitudinal axis A relative to the piston rod 950 causes the elastic strip 911 of the elastic compression device 910 to elastically compress and deform. Thereby providing an elastic restoring force to the liquid pump.

The upper end of the piston rod bracket 945 is fixed to the mouthpiece 940, and the lower end has a hole 946 for fixing the piston rod 950, and the piston rod 950 is fixedly mounted in the hole 946 to maintain the fixing relative to the socket 940. A support table 947 is formed around the hole 946 for supporting the lower end of the elastic compression device 910 (i.e., the lower base 912b). The rings of the upper base 912a and the lower base 912b of the elastic compression device 910 are sleeved on the piston rod 950. The upper base 912a of the elastic compression device 910 abuts against the lower end of the cylinder 930.

Fig. 47 shows several examples of the shape of the façade of the elastic strip which can be used in the elastic returning device of the present invention, and Fig. 48 shows several examples of the sectional shape of the elastic strip which can be used in the elastic returning device of the present invention. Of course, there are many other shapes.

The invention has been described above by the description of the exemplary embodiments, but the technology in the art It will be apparent to those skilled in the art that various changes may be made in the embodiments shown. For example, in many of the illustrated embodiments, a camming mechanism for transitioning an elastic return device between an unloaded and preloaded state and a configuration of an elastic compression device as another aspect of the present invention as an aspect of the present invention They are implemented simultaneously, but they can be implemented separately in different embodiments. As another example, in the illustrated embodiment relating to the aspect of the present invention for transitioning an elastic return device between an unloaded and preloaded state, the conversion of the liquid pump between the first and second positions is through The movable unit is rotated relative to the fixed unit about the longitudinal axis, but can also be realized by other means, such as using a mechanism similar to that used in a telescopic ballpoint pen, as long as the compression of the elastic reset device can be achieved in this manner. And stretching. For another example, in the eighth embodiment, the cam surface constituting the cam action mechanism is formed on the bracket 855, but the cam surface may be formed on the piston rod 850. For another example, in most of the illustrated embodiments, an even number (eg, two, four) of elastic strips are used, but an odd number (eg, three, five) of elastic strips are also fully feasible; Whether an even number or an odd number of elastic strips can be configured such that the resultant line of force of the resultant spring force coincides with the longitudinal axis of the liquid pump. Therefore, the scope of the invention is not limited to the specific embodiments described, but the scope of the appended claims.

Claims

Claim

A push-type liquid pump for mounting to a container for pumping a liquid product in the container to the outside of the container, the liquid pump comprising a fixed unit that is fixed relative to the container and capable of being opposite Actuating the reciprocating movement unit of the fixing unit, the pumping of the liquid product to the outside of the container by the reciprocating motion, the reciprocating motion being applied by the user on the movable unit Pressing force of the movable unit relative to the fixed unit along the longitudinal axis of the liquid pump and elastic return for resetting the movable unit relative to the fixed unit along the longitudinal axis after the pressing force is removed The elastic force of the device is synergistically realized, characterized in that

The liquid pump is switchable between a first position and a second position in the absence of the pressing force applied to the movable unit, in which the elastic reset device is not loaded State, and in the second position, the elastic reset device is in a preloaded state.

2. The liquid pump according to claim 1, wherein the conversion of the liquid pump between the first position and the second position is by surrounding the movable unit with respect to the fixed unit The longitudinal axis is rotated to achieve.

The liquid pump according to claim 2, wherein one of the movable unit and the fixing unit and the elastic returning device comprise a cam action mechanism, and the cam acting mechanism is configured to be responsive to said The resilient returning means longitudinally compresses or expands the movable unit relative to rotation of the fixed unit about the longitudinal axis.

The liquid pump according to claim 3, wherein said movable unit and said elastic resetting means comprise said cam acting mechanism.

The liquid pump according to claim 4, wherein the movable unit includes a piston rod, and the cam acting mechanism is formed by a cam member formed on the piston rod and the elastic returning device The end of the cam member is formed.

The liquid pump according to claim 5, wherein the cam member includes two bearing surfaces at different heights in the longitudinal axis direction and a transition slope connecting the two bearing surfaces, A bearing surface is adapted to mate with the end of the resilient return device, the two bearing surfaces defining the first position and the second position, respectively.

The liquid pump according to claim 4, wherein the movable unit includes a piston rod, the cam action mechanism is composed of a lower end of the piston rod and the elastic reset device and the piston rod The upper surface of the lower end is configured.

The liquid pump according to claim 7, wherein said upper surface of said elastic returning means comprises a cam surface, said cam surface comprising two bearing faces at different heights in said longitudinal axis direction The bearing surface is adapted to cooperate with the lower end of the piston rod, the two bearing surfaces defining the first position and the second position, respectively.

The liquid pump according to claim 4, wherein the movable unit includes a pressing head, and the cam acting mechanism is composed of a lower end of the pressing head and a portion of the elastic returning device and the pressing head The upper surface of the lower end is configured.

The liquid pump according to claim 9, wherein said upper surface of said elastic returning means comprises a cam surface, said cam surface comprising two bearing faces at different heights in said longitudinal axis direction The bearing surface is adapted to mate with the lower end of the ram, the two bearing surfaces defining the first position and the second position, respectively.

The liquid pump according to claim 4, wherein the movable unit includes a piston rod, the elastic returning device includes a bracket fixed to an end thereof, and the cam acting mechanism is formed on the piston rod The upper projection and the cam surface formed on the bracket are formed.

The liquid pump according to claim 3, wherein the fixing unit and the elastic returning device comprise the cam acting mechanism.

The liquid pump according to claim 12, wherein the movable unit includes a pressing head for applying a downward pressure to an upper end of the bellows cylinder, the fixing unit including a lower end supporting the bellows cylinder a cylinder bracket, the upper end of the elastic return device is drivingly coupled to the indenter, the cam action mechanism is formed by a through hole and a bearing surface formed on the cylinder bracket, and the elastic reset device The through hole and the support surface are combined to form a lower end.

The liquid pump according to claim 13, wherein the through hole allows the lower end of the elastic returning device to pass, and the supporting surface is adapted to engage the lower end of the elastic returning device The lower end of the elastic returning device has a guiding slope configured to enable the lower end of the elastic returning device to move between the through hole and the supporting surface, the through hole and The bearing surfaces define the first position and the second position, respectively.

The liquid pump according to claim 1, wherein the first position corresponds to a locking position in which the movable unit cannot move relative to the fixed unit, and the second position corresponds to In the unlocked position, the active unit can be relative to the fixed unit in the unlocked position Exercise.

The liquid pump according to claim 1, wherein the elastic returning device is an elastic compressing device or an elastic stretching device.

17. The liquid pump of claim 2, wherein the switching of the liquid pump between the first position and the second position is by surrounding the movable unit with respect to the fixed unit The longitudinal axis is rotated approximately 90 degrees.