WO2022022308A1 - 具有弹性活塞的液体泵及其制造方法 - Google Patents

具有弹性活塞的液体泵及其制造方法 Download PDF

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Publication number
WO2022022308A1
WO2022022308A1 PCT/CN2021/107007 CN2021107007W WO2022022308A1 WO 2022022308 A1 WO2022022308 A1 WO 2022022308A1 CN 2021107007 W CN2021107007 W CN 2021107007W WO 2022022308 A1 WO2022022308 A1 WO 2022022308A1
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WIPO (PCT)
Prior art keywords
piston
piston rod
liquid pump
mold
cylinder
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Application number
PCT/CN2021/107007
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English (en)
French (fr)
Inventor
丁要武
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丁要武
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Publication of WO2022022308A1 publication Critical patent/WO2022022308A1/zh

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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
    • B05B11/00—Single-unit hand-held apparatus in which flow of contents is produced by the muscular force of the operator at the moment of use
    • B05B11/01—Single-unit hand-held apparatus in which flow of contents is produced by the muscular force of the operator at the moment of use characterised by the means producing the flow
    • B05B11/10—Pump arrangements for transferring the contents from the container to a pump chamber by a sucking effect and forcing the contents out through the dispensing nozzle
    • B05B11/1001—Piston pumps
    • B05B11/1023—Piston pumps having an outlet valve opened by deformation or displacement of the piston relative to its actuating stem
    • B05B11/1026—Piston pumps having an outlet valve opened by deformation or displacement of the piston relative to its actuating stem the piston being deformable and its deformation allowing opening of the outlet
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
    • B05B11/00—Single-unit hand-held apparatus in which flow of contents is produced by the muscular force of the operator at the moment of use
    • B05B11/01—Single-unit hand-held apparatus in which flow of contents is produced by the muscular force of the operator at the moment of use characterised by the means producing the flow
    • B05B11/10—Pump arrangements for transferring the contents from the container to a pump chamber by a sucking effect and forcing the contents out through the dispensing nozzle
    • B05B11/1001—Piston pumps
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C39/00—Shaping by casting, i.e. introducing the moulding material into a mould or between confining surfaces without significant moulding pressure; Apparatus therefor
    • B29C39/02—Shaping by casting, i.e. introducing the moulding material into a mould or between confining surfaces without significant moulding pressure; Apparatus therefor for making articles of definite length, i.e. discrete articles
    • B29C39/10—Shaping by casting, i.e. introducing the moulding material into a mould or between confining surfaces without significant moulding pressure; Apparatus therefor for making articles of definite length, i.e. discrete articles incorporating preformed parts or layers, e.g. casting around inserts or for coating articles
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
    • B05B11/00—Single-unit hand-held apparatus in which flow of contents is produced by the muscular force of the operator at the moment of use
    • B05B11/01—Single-unit hand-held apparatus in which flow of contents is produced by the muscular force of the operator at the moment of use characterised by the means producing the flow
    • B05B11/10—Pump arrangements for transferring the contents from the container to a pump chamber by a sucking effect and forcing the contents out through the dispensing nozzle
    • B05B11/1042—Components or details
    • B05B11/1043—Sealing or attachment arrangements between pump and container
    • B05B11/1046—Sealing or attachment arrangements between pump and container the pump chamber being arranged substantially coaxially to the neck of the container
    • B05B11/1047—Sealing or attachment arrangements between pump and container the pump chamber being arranged substantially coaxially to the neck of the container the pump being preassembled as an independent unit before being mounted on the container

Definitions

  • the present invention relates to a liquid pump for pumping product from a container, in particular a liquid pump with a resilient piston.
  • liquid pump On packaging containers of daily chemical products such as shampoos, shower gels, or the like, a liquid pump is often installed for pumping the product out of the container for consumer use.
  • the so-called “liquid pump” includes a pump mechanism that can pump any fluid or semi-fluid product, including liquids, emulsions, suspensions, and the like.
  • Figures 14a and 14b show an exemplary prior art liquid pump 1, wherein the liquid pump 1 shown in Figure 14a is in an up position and the liquid pump 1 shown in Figure 14a is in a down position.
  • the liquid pump 1 generally includes a head 10 , a mouthpiece 20 , a cylinder 30 and a piston rod 40 .
  • the tooth sleeve 20 is connected with the cylinder 30
  • the piston rod 40 is connected under the pressure head 10 and extends into the cylinder 30 .
  • a piston 50 is provided at the lower end of the piston rod 40 . More specifically, the piston 50 is sleeved on the concave portion of the lower end of the piston rod 40 .
  • a through hole is formed at the part of the piston rod 40 where the piston 50 is provided, which communicates with the cavity inside the piston rod 40 .
  • the piston 50 covers the through hole on the piston rod 40, so that the upper one-way valve 51 is in the closed position, and as shown in FIG. 14b, when the ram 10 is pressed down, the piston The rod 40 then moves downward.
  • the piston 50 is deformed, and the through hole on the piston rod 40 is opened, so that the upper check valve 51 is opened.
  • the middle part of the piston is clamped in the concave part of the piston rod.
  • the pressure head is pressed down, the middle part of the piston is not easily deformed, so that the upper one-way valve is not easy to open, or the consumer needs to apply Only a larger pressing force can make the upper one-way valve open, thus affecting the consumer's use experience.
  • the difficulty or delay in opening the upper one-way valve can potentially lead to risks such as suffocation of the liquid pump and backflow of the lower one-way valve.
  • An object of the present invention is to provide a liquid pump with an improved structure, which can easily open its upper one-way valve during being pressed. Furthermore, the liquid pump of the present invention can also be easily installed.
  • the liquid pump of the present invention includes a pressure head, a tooth sleeve and a cylinder, a piston rod is connected below the pressure head, the tooth sleeve and the air cylinder are connected together, and the lower end of the piston rod extends into the cylinder, a depression is formed on the piston rod, and a depression is formed on the piston rod.
  • At least one through hole extending from the outer surface of the piston rod to the inner cavity of the piston rod is formed in the part, wherein an elastic piston is sleeved at the recessed part of the piston rod, and the piston comprises: a lower ring located at the lower part of the piston , the lower ring has a first outer diameter; and the joint portion has a second outer diameter smaller than the first outer diameter, so that the joint portion is recessed inward relative to the lower ring to form a thin-walled portion, and the joint portion and the piston rod are in contact with each other.
  • At least one through hole is matched to form an upper one-way valve of the liquid pump.
  • the joint portion of the piston and the piston rod is in the form of a thin-walled portion, which is more easily deformable than the existing piston, thereby helping to easily open the one-way valve thereon.
  • the piston with the thin-walled portion is easier to install on the piston rod, and is less likely to be damaged during the installation process.
  • the piston also has an upper ring located on the upper part of the piston, the joint part is located on the upper ring and the lower ring, wherein the upper ring has a third outer diameter, and the third outer diameter is smaller than the first outer diameter and larger than the second outer diameter.
  • the connection between the piston and the piston rod can be made more stable by the upper ring.
  • a convex ring is formed on the inner surface of the upper ring, and a groove is formed on the piston rod.
  • the convex ring is embedded in the groove.
  • the ring-groove arrangement may facilitate a sealing fit between the upper portion of the piston and the piston rod.
  • a stepped portion is formed on the piston rod, the stepped portion is located above the piston, and when the indenter is at the top dead center of its stroke, the stepped portion is in contact with the mouthpiece. Thereby, the ram is prevented from continuing its upward movement beyond the top dead center of its stroke.
  • the lower ring of the piston includes a sealing surface, and when the ram moves to the top dead center of its stroke, the sealing surface is in contact with the part of the tooth sleeve that protrudes into the cylinder. This sealing surface helps prevent product leakage.
  • the liquid pump further includes a cylinder head, the cylinder head is mounted on the tooth sleeve, and the lower ring of the piston includes a sealing surface, when the pressure head moves to its stroke top dead center, the sealing surface and the cylinder head are in contact with each other. The parts that protrude into the cylinder are in contact.
  • a demolding aid portion is also formed on the piston, and the demolding assist portion helps to peel the piston from the piston rod after the piston is formed.
  • the demolding aid may be a groove or a boss formed on the upper surface of the lower ring of the piston.
  • the liquid pump further includes a piston head, and the piston rod, piston and piston head are assembled together to form a piston assembly.
  • the inner wall of the cylinder is formed with: an upper raised portion, when the ram is at the top dead center of its stroke, the upper raised portion is in contact with the piston; and/or a lower raised portion, when the ram is at its stroke.
  • the lower protrusion is in contact with the piston.
  • the upper bulge and the lower bulge can increase the friction force between the piston and the inner wall of the cylinder, thereby further contributing to the deformation of the piston and improving the sensitivity of the upper one-way valve.
  • the piston rod mold includes the mold core and the outer mold;
  • a piston mold is sleeved at the position of the concave portion of the piston rod for molding the piston, and the piston mold includes a radially inwardly extending insert, and the shape of the insert corresponds to the shape of the joint portion of the piston;
  • this method adopts the secondary molding process, so that the piston can be easily formed on the piston rod, avoiding the forced diameter expansion of the piston when the piston is sleeved on the piston rod, and can also easily form a thin film on the piston. wall.
  • the piston rod is made of a first molding material and the piston is made of a second molding material.
  • the molding temperature of the first molding material is higher than the molding temperature of the second molding material; and/or the first molding material and the second molding material are difficult to adhere together. This facilitates peeling the piston from the piston rod after molding is complete, preventing them from sticking together.
  • the mold used for molding the piston rod especially the position on the mold corresponding to the part of the piston rod that will be in contact with the piston. Polished. In this way, the surface of the produced piston rod, especially the surface of the part in contact with the piston, can be made smoother, thereby facilitating the separation of the piston and the piston rod from each other.
  • Figure 1a shows a cross-sectional view of the liquid pump of the first embodiment of the present invention, wherein the liquid pump is at the top dead center of its stroke.
  • Fig. 1b shows another cross-sectional view of the liquid pump of the first embodiment of the present invention, wherein the liquid pump is in a depressed state.
  • Figure 2a shows a cross-sectional view of the piston rod and piston assembly of the liquid pump of Figures 1a and 1b with the piston in an undeformed state.
  • Figure 2b is another cross-sectional view of the piston rod and piston assembly shown in Figure 2a with the piston deformed so that the upper one-way valve opens.
  • Fig. 2c is a partial enlarged view of part I in Fig. 2b.
  • Figure 3a is a front view of the piston rod of the first embodiment.
  • Figure 3b is a cross-sectional view of the piston rod shown in Figure 3a.
  • Figure 3c is a perspective view of the piston rod shown in Figure 3a.
  • Figure 4a is a cross-sectional view of the piston of the first embodiment.
  • Figure 4b is a perspective view of the piston shown in Figure 4a.
  • Fig. 5 is a cutaway perspective view of a piston of a modified structure.
  • Fig. 6a shows a cross-sectional view of the liquid pump according to the second embodiment of the present invention, wherein the state where the pressure head is initially depressed is shown.
  • Fig. 6b shows another cross-sectional view of the liquid pump of the second embodiment, which shows the initial reset state of the head.
  • FIG. 7 shows a cross-sectional view of the piston assembly of the liquid pump of the second embodiment.
  • FIG. 8 shows a cross-sectional view of the piston rod of the piston assembly shown in FIG. 7 .
  • FIG. 9 shows a cross-sectional view of the piston of the piston assembly shown in FIG. 7 .
  • FIG. 10 shows a cross-sectional view of the piston head of the piston assembly shown in FIG. 7 .
  • FIG. 11 shows a cross-sectional view of the cylinder of the liquid pump of the second embodiment.
  • Figure 12 shows a cross-sectional view of a piston assembly of a modified configuration.
  • Figure 13 shows a cross-sectional view of a piston assembly of another modification.
  • Fig. 14a shows a cross-sectional view of a conventional liquid pump in an upper standby state.
  • Figure 14b shows another cross-sectional view of the liquid pump of Figure 14a in a depressed state.
  • Figures 1a-5 show a liquid pump 100 of a first embodiment of the present invention.
  • the liquid pump 100 generally includes a head 110 , a mouthpiece 120 , a cylinder 130 and a piston rod 140 .
  • the tooth sleeve 120 and the cylinder 130 are connected together, one end of the piston rod 140 is connected to the lower part of the pressing head 110 , and the other end extends into the cylinder 130 .
  • a piston 150 is provided on one end of the piston rod 140 that protrudes into the cylinder 130 .
  • the piston 150 is a deformable elastic piston. During the process of pressing the pressure head 110 downward as shown in FIG. Through holes in rod 140. It can be seen that the piston 150 cooperates with the through hole on the piston rod 140 to form the upper one-way valve 160 of the liquid pump 100 .
  • Figures 2a and 2b show cross-sectional views of the piston rod 140 and piston 150 assembled together, and Figure 2c shows a partial enlarged view of part I in Figure 2b.
  • the middle portion of the piston 150 in the liquid pump 100 in the longitudinal direction is in the form of a thin-walled portion 153 formed by being hollowed out in the radial direction.
  • the thin-walled portion 153 is easily deformed, thereby exposing the through hole provided on the piston rod 140 ( FIG. 2 b ), thereby allowing products to pass through the through hole as shown in the figure into the inner cavity of the piston rod 140 as indicated by arrow A of , and can then be dispensed out of the container through the ram 110 .
  • the piston rod 140 includes a concave portion 141 disposed near the lower end, and at least one through hole 142 is formed at the concave portion 141.
  • the through hole 142 extends from the outer surface of the piston rod 140 to the cavity inside the piston rod 140, thereby Create a channel for product entry.
  • two or more through holes 142 may be included, and these through holes 142 are arranged spaced apart from each other around the circumference of the piston rod 140 , preferably, the through holes 142 are arranged at equal intervals.
  • the piston rod 140 is further formed with a step portion 143, for example, the step portion 143 is located above the piston 150.
  • the step portion 143 can be connected with the piston rod 140.
  • the mouthpiece 120 is in contact to prevent the ram 110 and the piston rod 140 from continuing to move upward.
  • FIG. 4a and 4b show a cross-sectional view and a perspective view, respectively, of the piston 150 disposed on the piston rod 140.
  • FIG. The piston 150 has a lower ring 151 located at the lower part, an upper ring 152 located at the upper part, and a joint part therebetween, and the joint part is fitted with the concave part 141 on the piston rod 140 .
  • the lower ring 151 of the piston 150 has a larger first outer diameter
  • the joint portion has a second outer diameter
  • the second outer diameter is smaller than the first outer diameter of the lower ring 151
  • the upper ring 152 has a third outer diameter
  • the The third outer diameter is smaller than the first outer diameter and larger than the second outer diameter.
  • the joint portion is a thin-walled portion 153 formed by hollowing out radially inward, or the thin-walled portion 153 is a radially inward concave structure.
  • the thin-walled portion 153 is easier to deform.
  • the lower ring 151 of the piston 150 further includes a sealing surface 155 , and the sealing surface 155 is formed on the upper part of the lower ring 151 .
  • the sealing surface 155 may come into contact with the portion of the mouthpiece 120 that protrudes into the cylinder 130, as shown in FIG. 1a. In this way, at top dead center, a seal is formed between the piston 150 and the socket 120 to help prevent product in the cylinder 130 located below the piston 150 from leaking out from the point of contact between the piston 150 and the cylinder 130.
  • the piston rod 140 is injection molded in a mold.
  • a mold for injection molding of the piston rod 140 includes a core and an outer mold, and a molding material is injected into the cavity between the core and the outer mold, and the molding material is cured to form a blank for the piston rod 140 .
  • the outer mold is removed while the mold core remains in the resulting piston rod 140 .
  • a mold for forming the piston 150 is placed on the position of the concave portion 141 of the molded piston rod 140 .
  • the mold for forming the piston 150 has a radially inwardly extending insert, the shape of which corresponds to the concave shape of the thin-walled portion 153 of the piston 150 .
  • the molding material for forming the piston 150 is injected into the mold.
  • the molding material for forming the piston 150 is different from the molding material for forming the piston rod 140, especially their molding temperature is greatly different.
  • the molding material used to form the piston rod 140 has a higher molding temperature, while the molding material used to form the piston 150 has a lower molding temperature.
  • the material used to form the piston 150 and the material used to form the piston rod 140 have poor adhesion properties to each other. In this way, it may be facilitated to separate the piston 150 and the piston rod 140 from each other after the piston 150 is molded.
  • FIG. 5 also shows a perspective cutaway view of a further preferred piston 150 . It is shown that a groove 154 is formed on a portion of the thin-walled portion 153 of the piston 150, such as the groove 154 formed in the upper surface of the lower ring 151 as shown in the figure.
  • the groove 154 may include several discrete grooves distributed around the circumference, or an annular groove formed continuously extending along the circumference. Alternatively, in other embodiments, the grooves 154 shown in the figures may also be replaced by protrusions.
  • the friction force between the piston 150 and the mold can be increased when the piston 150 is demolded after molding, thereby helping to peel the piston 150 from the piston rod 140 at the same time of demolding .
  • the mold for molding the piston rod 140 may be polished, for example, the part of the mold corresponding to the part where the piston rod 140 will be in contact with the piston 150
  • the part of the mold corresponding to the outer surface of the recessed part 141 of the piston rod 140 is polished, so that the smoothness of the molded piston rod 140 in this part can be improved, thereby helping to remove the piston 150 from the piston rod 150.
  • the piston rod 140 is peeled off.
  • the piston 150 is formed on the piston rod 140 by an over-injection molding process. In this way, it is not necessary to mount the piston 150 on the piston rod 140 by forcibly expanding the diameter as in the prior art, and this method can also easily form the thin-walled portion 153 on the piston 150 .
  • the mouthpiece 120 is a one-piece mouthpiece.
  • a cylinder head may also be included, the cylinder head is mounted with the tooth sleeve, and the part of the cylinder head that protrudes into the cylinder 130 is.
  • the above-mentioned sealing surface 155 may be in contact with the portion of the cylinder head that protrudes into the interior of the cylinder 130 .
  • Figures 6a-11 show a liquid pump 200 of a second embodiment of the present invention.
  • the technical features of the second embodiment that are different from the first embodiment will be mainly described, unless there is a contrary description in the following content or conflicts with other technical features, in the first embodiment
  • the described features are also applicable to the second embodiment and will not be described in detail here.
  • the liquid pump 200 generally includes a ram 210, a mouthpiece 220, a cylinder 230 and a piston assembly 240.
  • the mouthpiece 220 is connected with the cylinder 230 .
  • One end (upper end) of the piston assembly 240 is connected to the lower part of the ram 210 , and the other end (lower end) extends into the cylinder 230 .
  • FIG. 7 A cross-sectional view of the piston assembly 240 is shown in FIG. 7 .
  • the piston assembly 240 includes a piston rod 241 , a piston 242 and a piston head 244 .
  • the piston rod 241 and the piston head 244 are connected together, and after being connected, a recessed portion is formed, which is similar to the recessed portion 141 in the first embodiment.
  • a through hole 245 is formed on the piston rod 241 or the piston head 244, and the position of the through hole 245 is set so that after the piston rod 241 and the piston 242 are connected together, the through hole 245 is exposed.
  • a through hole 245 is formed in the piston head 244 on a portion of the piston head 244 that does not overlap the piston rod 241 in the mounted state.
  • the through hole 245 may also be formed on the piston rod 241 and located on a portion of the piston rod 241 that does not overlap with the piston head 244 in the installed state.
  • through holes may be formed on the piston rod 241 and the piston head 244 respectively, and when the piston rod 241 and the piston head 244 are connected to each other, the respective through holes of the piston rod 241 and the piston head 244 are aligned with each other, to form the through hole 245 of the assembled piston assembly 240 .
  • the through hole 245 cooperates with the joint portion of the piston 242 to form an upper one-way valve of the liquid pump 200 .
  • the piston assembly 240 also includes a piston 242, which is basically the same in structure as the piston 150 in the first embodiment, for example, it also includes a thin-walled portion 243 formed approximately in the longitudinal middle portion of the piston 242, and the thin-walled portion 243 also passes through It is formed by hollowing out radially inward, and in the installed state, the thin-walled portion 243 cooperates with the concave portion formed after the piston rod 241 and the piston head 244 are connected, so as to play the role of the joint portion of the piston 242. effect.
  • a piston 242 which is basically the same in structure as the piston 150 in the first embodiment, for example, it also includes a thin-walled portion 243 formed approximately in the longitudinal middle portion of the piston 242, and the thin-walled portion 243 also passes through It is formed by hollowing out radially inward, and in the installed state, the thin-walled portion 243 cooperates with the concave portion formed after the piston rod 241 and the piston head 244 are connected, so as to play the role
  • the piston rod 241 , the piston 242 and the piston head 244 may be separately molded and then assembled together to form the piston assembly 240 .
  • the piston 242 can be sleeved on one of the piston rod 241 and the piston head 244, and then connected to the other one of the piston rod 241 and the piston 242. , it is not necessary to forcibly expand the diameter of the piston 242 during this process.
  • the piston assembly 240 can also be manufactured by the over-injection molding process disclosed above in the first embodiment.
  • the piston rod 241 may be molded first, then the piston 242 may be molded on the piston rod 241 , and the prefabricated piston head 244 may be attached to the piston rod 241 .
  • the piston 242 can be molded on the molded piston head 244, and then the piston head 244, together with the piston 242, can be attached to the pre-fabricated piston rod 241.
  • an upper raised portion 231 and a lower raised portion 232 are further formed on the inner wall of the cylinder 130 .
  • Each of the upper convex portion 231 and the lower convex portion 232 may be in the form of a continuous convex ring, or may be in the form of discontinuous protrusions distributed along the circumferential direction of the cylinder 230 .
  • the upper protruding portion 231 and the lower protruding portion 232 are arranged so that when the ram 210 is at the top dead center of its stroke, the upper protruding portion 231 and the piston 242, especially the lower protruding portion of the piston 242 with a larger diameter, are arranged so that The rings are in contact, and when the ram 210 is at the bottom dead center of its stroke, the lower boss 232 is in contact with the piston 242 , especially the lower ring of the piston 242 having a larger diameter.
  • the upper protruding portion 231 is in contact with the piston 242, which increases the friction between the piston 242 and the inner wall of the cylinder 230, so that the piston 242 can deform more quickly and open the upper one-way valve .
  • the lower protrusion 232 is in contact with the piston 242, increasing the friction between the piston 242 and the inner wall of the cylinder 230, so that the piston 242 can be more Deform quickly to close the upper one-way valve.
  • the upper one-way valve can be opened or closed in a faster response through the arrangement of the upper raised portion 231 and the lower raised portion 232 .
  • FIGS 12 and 13 show other possible modifications of the piston assembly in the liquid pump of the present invention.
  • the piston 350 mounted on the piston rod 340 includes a lower ring 351 having a larger diameter and a joint portion 352 having a smaller diameter.
  • the joint portion 352 is matched with the concave portion of the piston rod 340 , and is a thin-walled portion concave radially inward relative to the lower ring 351 .
  • the lower ring 351 of the piston 350 is generally in the form of a cone. When the pressure head of the liquid pump is pressed, the lower ring 351 of the piston 350 will be more easily deformed upward, so that the upper one-way valve can be opened more quickly.
  • the piston 450 mounted on the piston rod 440 includes a lower ring 451, an upper ring 452 and a joint 453 between the lower ring 451 and the upper ring 452, the joint 453 is similar to that in the first and second embodiments, and the thin-walled portion is formed by being recessed inward in the radial direction.
  • a convex ring 454 is formed on the inner side of the upper ring 452 , and correspondingly, a groove 441 is formed on the piston rod 440 . After the molding is completed, the convex ring 454 of the piston 450 is inserted into the groove 441 of the piston rod 440 . The sealing fit between the upper part of the piston 450 and the piston rod 440 can be facilitated by the cooperation between the convex ring 454 and the groove 441 .

Abstract

一种液体泵（100）及其制造方法，液体泵（100）包括压头（110）、牙套（120）和气缸（130），压头（110）的下方连接有活塞杆（140），活塞杆（140）上设置有弹性的活塞（150），牙套（120）和气缸（130）连接在一起。活塞（150）包括：位于活塞（150）的下部的下圈（151），其具有第一外径；以及结合部，其具有小于第一外径的第二外径，从而结合部相对于下圈（151）向内凹陷而形成薄壁部（153），且结合部与活塞杆（140）的至少一个通孔（142）相配合，形成液体泵（100）的上单向阀（160）。采用二次成型工艺，将活塞（150）形成在活塞杆（140）上。

Description

具有弹性活塞的液体泵及其制造方法 技术领域
本发明涉及一种用于从容器泵送产品的液体泵，特别地涉及一种带有弹性活塞的液体泵。
背景技术
在诸如洗发水、沐浴乳之类的日化产品或类似产品的包装容器上，常常安装有液体泵，用于从容器中将产品泵送出来以供消费者使用。此处，所谓的“液体泵”包括可以泵送任何具有流动性或半流动性产品的泵机构，包括液体、乳液、悬浮液等。
图14a和14b示出了一种示例性的现有液体泵1，其中，在图14a中示出的液体泵1处于上位状态，而图14a中示出的液体泵1处于下压状态。如图所示，液体泵1总体上包括压头10、牙套20、气缸30和活塞杆40。牙套20与气缸30连接在一起，活塞杆40连接在压头10的下方，并伸入到气缸30内。在活塞杆40的下端设置有活塞50。更具体地，该活塞50套设在活塞杆40下端的凹陷部上。在活塞杆40的设置有活塞50的部分处形成有通孔，与活塞杆40内部的空腔连通，该通孔与活塞50相配合，构成该液体泵1的上单向阀51。在图14a所示的上位状态中，活塞50覆盖活塞杆40上的通孔，从而该上单向阀51处于关闭位置，而如图14b所示的，当向下按压压头10时，活塞杆40随之向下运动，在此过程中，由于活塞50与气缸30的内壁之间的摩擦力，活塞50变形，打开活塞杆40上的通孔，从而上单向阀51打开。
在实践中发现，上述结构的液体泵存在一些问题。比如，在该液体泵中，活塞的中部卡装于活塞杆的凹陷部中，在向下按压压头时，活塞的中部不易变形，导致上单向阀不容易打开，或者说需要消费者施加较大的按压力才能使得上单向阀打开，从而影响了消费者的使用体验。而且上单向阀打开困难或迟滞还会潜在地导致液体泵闷气、其下单向阀回流等风险。
另外，从图中可以看到，为了确保活塞在活塞杆上的位置能够被限制在一定的范围之内，活塞配合在活塞杆的凹陷部中，这对活塞的安装也提出了挑战。在 安装现有的该类型液体泵的过程中，需要将活塞强行扩径，以使得活塞能够套上活塞杆的凹陷部上方或下方的较大直径部分，然后再朝着凹陷部滑移，以进入到凹陷部中。此种装配对于装配人员来说费时费力，而且在安装过程中，由于活塞被强行扩径，因此存在活塞在安装过程中受损的风险，进而会影响液体泵的功能的正常实现。
因此，在本领域中，仍存在对改进结构的液体泵的需求，以克服以上所述的至少一个技术问题。
发明内容
本发明是为了解决以上的现有技术中所存在的问题中的至少一个而作出的。本发明的目的是提供一种具有改进结构的液体泵，该液体泵在被按压过程中能够容易地打开其上单向阀。另外进一步地，本发明的液体泵还能够容易地安装。
本发明的液体泵包括压头、牙套和气缸，压头的下方连接有活塞杆，牙套和气缸连接在一起，且活塞杆的下端延伸到气缸内部，在活塞杆上形成有凹陷部，在凹陷部中形成有从活塞杆的外表面延伸到活塞杆的内部空腔的至少一个通孔，其中，在活塞杆的凹陷部处套设有弹性的活塞，活塞包括：位于活塞的下部的下圈，下圈具有第一外径；以及结合部，结合部具有小于第一外径的第二外径，从而结合部相对于下圈向内凹陷而形成薄壁部，且结合部与活塞杆的至少一个通孔相配合，形成液体泵的上单向阀。
对于上述结构的液体泵来说，活塞与活塞杆的结合部呈薄壁部的形式，从而与已有的活塞相比更易变形，从而有助于容易地打开其上单向阀。而且，具有薄壁部的活塞更易安装在活塞杆上，且在安装过程中不易损坏。
进一步地，活塞还具有位于活塞的上部的上圈，结合部位于上圈和下圈，其中，上圈具有第三外径，第三外径小于第一外径且大于第二外径。可通过该上圈使活塞与活塞杆的连接更加稳定。
较佳地，在上圈的内表面上形成有凸环，在活塞杆上形成有凹槽，当活塞安装在活塞杆上时，凸环嵌入在凹槽中。该凸环-凹槽结构可有助于活塞的上部与活塞杆之间的密封配合。
较佳地，在活塞杆上形成有台阶部，台阶部位于活塞上方，且当压头处 于其行程上止点时，台阶部与牙套相接触。由此，防止压头越过其行程上止点而继续向上运动。
较佳地，活塞的下圈上包括密封面，当压头运动到其行程上止点时，密封面与牙套的伸入到气缸中的部分相接触。该密封面有助于防止产品的泄漏。
在另一种结构中，液体泵还包括气缸盖，气缸盖安装在牙套上，并且，活塞的下圈上包括密封面，当压头运动到其行程上止点时，密封面与气缸盖的伸入到气缸中的部分相接触。
较佳地，在活塞上还形成有脱模辅助部，脱模辅助部有助于在活塞成型之后使活塞从活塞杆剥离。例如，该脱模辅助部可以是形成在活塞的下圈的上表面上的凹槽或凸起部。
在一种替代结构中，液体泵还包括活塞头，活塞杆、活塞和活塞头组装在一起，形成活塞组件。
较佳地，气缸的内壁上形成有：上凸起部，当压头处于其行程上止点时，上凸起部与活塞相接触；和/或下凸起部，当压头处于其行程下止点时，下凸起部与活塞相接触。该上凸起部和下凸起部可增加活塞与气缸内壁之间的摩擦力，从而进一步有助于活塞变形，提高上单向阀的灵敏度。
还涉及一种制造上述液体泵的方法，其中，通过如下步骤来形成活塞杆和活塞：
在活塞杆模具中模制活塞杆，活塞杆模具包括模芯和外模；
在制成活塞杆之后，去除外模，将模芯保留在所制成的活塞杆之中；
在活塞杆的凹陷部的位置处套上活塞模具，用于模制活塞，活塞模具包括径向向内延伸的插片，插片的形状对应于活塞的结合部的形状；
在制成活塞之后，将活塞模具和活塞杆模具的模芯从活塞杆和活塞上脱下。
可以看到，该方法采用二次成型工艺，使活塞能够容易地形成在活塞杆上，避免了将活塞套装到活塞杆上时对活塞的强行扩径，并且还能够容易地在活塞上形成薄壁部。
活塞杆由第一模制材料制成，活塞由第二模制材料制成。其中较佳地，第一模制材料的成型温度高于第二模制材料的成型温度；和/或，第一模制材 料和第二模制材料难以粘附在一起。这样，可便于在模制完成之后将活塞从活塞杆剥离，避免它们粘在一起。
进一步较佳地，为了避免活塞杆和活塞粘在一起，还可以对用于模制活塞杆的模具进行抛光，特别是对模具上与活塞杆的将与活塞相接触的部分相对应的位置进行抛光处理。这样，可使所制成的活塞杆的表面、特别是与活塞相接触部分的表面更加光滑，从而有助于活塞与活塞杆相互分离。
附图说明
附图中示出了本发明的非限制性的较佳实施结构，结合附图，可使本发明的特征和优点更加明显。其中：
图1a示出了本发明的第一实施例的液体泵的剖视图，其中液体泵处于其行程上止点处。
图1b示出了本发明的第一实施例的液体泵的另一剖视图，其中液体泵处于被下压的状态。
图2a示出了图1a和1b的液体泵的活塞杆和活塞的组件的剖视图，其中活塞处于未变形状态。
图2b是图2a所示的活塞杆和活塞的组件的另一剖视图，其中活塞变形，从而上单向阀打开。
图2c是图2b中的部分I的局部放大图。
图3a是第一实施例的活塞杆的正视图。
图3b是图3a所示的活塞杆的剖视图。
图3c是图3a所示的活塞杆的立体图。
图4a是第一实施例的活塞的剖视图。
图4b是图4a所示的活塞的立体图。
图5是一种变型结构的活塞的剖切立体图。
图6a示出了本发明的第二实施例的液体泵的剖视图，其中示出了压头被初始下压的状态。
图6b示出了第二实施例的液体泵的另一剖视图，其中示出了压头初始复位的状态。
图7示出了第二实施例的液体泵的活塞组件的剖视图。
图8示出了图7所示的活塞组件的活塞杆的剖视图。
图9示出了图7所示的活塞组件的活塞的剖视图。
图10示出了图7所示的活塞组件的活塞头的剖视图。
图11示出了第二实施例的液体泵的气缸的剖视图。
图12示出了一种变型结构的活塞组件的剖视图。
图13示出了另一种变型结构的活塞组件的剖视图。
图14a示出了一种现有的液体泵的剖视图，其中该液体泵处于上位的待用状态。
图14b示出了图14a的液体泵的另一剖视图，其中该液体泵处于被下压的状态。
具体实施方式
为了便于理解本发明，下面将结合附图对本发明的具体实施方式进行详细描述。应当理解，附图中所示的仅仅是本发明的较佳实施例，其不应理解为对本发明的范围的限制。本领域的技术人员可以在附图所示的实施例的基础上对本发明进行各种显而易见的修改、变型、等效替换，并且在不相矛盾的前提下，以下所描述的不同实施例中的技术特征可以互相任意地组合，而这些都落在本发明的范围之内。
在以下的对本发明的具体描述中，所使用的诸如“上”、“下”之类的表示方向和朝向的用语是以图中所示的液体泵的朝向为基准的。应理解，该液体泵的朝向有可能根据具体的应用场合而有所改变。
<第一实施例>
图1a－5示出了本发明的第一实施例的液体泵100。如图1a和1b所示，液体泵100总体上包括压头110、牙套120、气缸130和活塞杆140。牙套120和气缸130连接在一起，活塞杆140的一端连接在压头110的下部，另一端伸入到气缸130之内。在活塞杆140的伸入到气缸130内部的一端上设置有活塞150。该活塞150为可变形的弹性活塞，在如图1b所示地向下按压压头110 的过程中，活塞150与气缸130的内壁之间的摩擦力使得活塞150能够变形，从而露出设置在活塞杆140上的通孔。由此可见，活塞150和活塞杆140上的通孔相配合，构成液体泵100的上单向阀160。
图2a和图2b示出了装配在一起的活塞杆140和活塞150的截面图，图2c则示出的是图2b中的部分I的局部放大图。可以看到，液体泵100中的活塞150沿纵向的中间部分呈沿着径向被掏空而形成的薄壁部153的形式。在活塞杆140随着压头110向下运动的过程中，该薄壁部153容易变形，从而露出设置在活塞杆140上的通孔(图2b)，进而允许产品经由该通孔如图中的箭头A所示地进入活塞杆140的内腔中，然后可以通过压头110分配到容器外。
图3a-3c示出了活塞杆140的具体结构。活塞杆140包括设置在下端附近的凹陷部141，在该凹陷部141处形成有至少一个通孔142，通孔142从活塞杆140的外表面一直延伸到活塞杆140内的空腔中，从而形成供产品进入的通道。在较佳的实施结构中，可以包括两个或更多个通孔142，这些通孔142围绕着活塞杆140的周向相互间隔开地布置，优选的是通孔142等间距地布置。
较佳地，该活塞杆140上还形成有台阶部143，该台阶部143例如位于活塞150的上方，当压头110连通活塞杆140一起处于其行程上止点时，该台阶部143可以与牙套120相接触，以阻止压头110和活塞杆140继续向上运动。
图4a和4b分别示出了设置在活塞杆140上的活塞150的剖视图和立体图。活塞150具有位于下部的下圈151、位于上部的上圈152以及位于它们之间的结合部，该结合部配合于活塞杆140上的凹陷部141。活塞150的下圈151具有较大的第一外径，结合部具有第二外径，该第二外径小于下圈151的第一外径，并且，上圈152具有第三外径，该第三外径小于第一外径，且大于第二外径。在本发明中，结合部呈径向向内掏空而形成的薄壁部153，或者说该薄壁部153呈径向向内的内凹结构。与现有技术中的弹性活塞相比，该薄壁部153更易于变形。
活塞150的下圈151上还包括密封面155，密封面155形成在下圈151的上部。当压头110和活塞杆140向上运动到其行程上止点时，密封面155可与牙套120的伸入到气缸130中的部分相接触，如图1a所示。这样，在上止点处，在活塞150和牙套120之间形成密封，以有助于防止在气缸130中位于活 塞150下方的产品从活塞150和气缸130之间相接触的位置泄露出来。
下面将描述本发明的液体泵100中的活塞杆140和活塞150的优选形成方法。
首先，在模具中注塑成型活塞杆140。用于活塞杆140的注塑成型的模具包括模芯和外模，将模制材料注入到模芯和外模之间的模腔中，并使该模制材料固化，形成活塞杆140的坯件。在活塞杆140注塑成型完成之后，去除外模，同时将模芯保留在所得到的活塞杆140中。
接着，在成型的活塞杆140的凹陷部141的位置处套上用于形成活塞150的模具。该用于形成活塞150的模具上具有径向向内延伸的插片，该插片的形状对应于活塞150的薄壁部153的内凹的形状。将用于形成活塞150的模制材料注入到模具中。此处，较佳地，用于形成活塞150的模制材料不同于形成活塞杆140的模制材料，特别是它们的成型温度有较大差异。具体来说，用于形成活塞杆140的模制材料具有更高的成型温度，而形成活塞150的模制材料的成型温度较低。更佳地，用于形成活塞150的材料与形成活塞杆140的材料相互间的粘附特性较差。这样，可便于在活塞150模制成型之后，将活塞150和活塞杆140相互剥离开。
图5还示出了进一步优选的活塞150的立体剖切图。其中显示，在活塞150的薄壁部153的部分上形成有凹槽154，例如图中所示的形成于下圈151的上表面中的凹槽154。该凹槽154可以包括围绕着周向分布的若干个离散的凹槽，或者是沿着周向连续延伸而形成的环形槽。或者，在其它实施例中，也可以用凸起部来替代图中所示的凹槽154。
通过该诸如凹槽154之类的结构，在活塞150成型之后进行脱模时，可增加活塞150与模具之间的摩擦力，从而有助于在脱模的同时将活塞150从活塞杆140剥离。
进一步较佳地，为了便于脱模时将活塞150从活塞杆140剥离，可以对用于模制活塞杆140的模具进行抛光，例如模具上与活塞杆140将与活塞150相接触的部分相对应的部分、比如与活塞杆140的凹陷部141的外表面相对应的模具部分进行抛光处理，由此可提高模制而成的活塞杆140在该部分的光洁度，从而有助于将活塞150从活塞杆140剥离。
可以看到，在本发明中，通过二次注塑成型工艺，使活塞150形成在活塞杆140上。这样，可不用如现有技术那样通过强行扩径的方式将活塞150安装到活塞杆140上，并且该方式还能够容易地在活塞150上形成薄壁部153。
另外，在图示的实施例中，牙套120为一体式的牙套。除此之外，还可包括气缸盖，该气缸盖与牙套安装在一起，并且伸入到气缸130内部的是气缸盖的部分。进而，以上所提到的密封面155可与气缸盖的伸入到气缸130内部的部分相接触。
<第二实施例>
图6a～11示出了本发明的第二实施例的液体泵200。在以下对第二实施例的描述中，将主要描述第二实施例与第一实施例不同的技术特征，除非在以下内容中有相反的描述或者与其他技术特征冲突，在第一实施例中描述的特征也都适用于第二实施例，在此不再作详细描述。
在第二实施例中，如图6a和6b中所示的，液体泵200总体上包括压头210、牙套220、气缸230和活塞组件240。牙套220与气缸230连接在一起。活塞组件240一端(上端)连接在压头210的下部，另一端(下端)伸入到气缸230内。
图7中示出了活塞组件240的剖视图。其中活塞组件240包括活塞杆241、活塞242和活塞头244。活塞杆241和活塞头244连接在一起，并且在连接好之后形成有凹陷部，该凹陷部与第一实施例中的凹陷部141相类似。
在活塞杆241或者活塞头244上形成有通孔245，且该通孔245的位置被设置成，当活塞杆241和活塞242在一起连接好之后，通孔245暴露在外。例如，如图7中所示的，通孔245形成在活塞头244上，且位于活塞头244的在安装好的状态下不与活塞杆241相重叠的部分上。
当然，在另外的变型方式中，通孔245也可形成在活塞杆241上，且位于活塞杆241的在安装好的状态下不与活塞头244相重叠的部分上。
或者，也可在活塞杆241和活塞头244上分别形成有通孔，并且在活塞杆241和活塞头244相互连接好的状态下，活塞杆241和活塞头244各自的通孔互相对准，以形成组装好的活塞组件240的通孔245。该通孔245与活塞242 的结合部相配合，形成液体泵200的上单向阀。
活塞组件240还包括活塞242，该活塞242与第一实施例中的活塞150结构基本相同，例如其也包括大致形成在活塞242的纵向中间部分的薄壁部243，该薄壁部243也通过呈径向向内掏空而形成，并且在安装好的状态下，该薄壁部243与活塞杆241和活塞头244连接好之后形成的凹陷部相配合，从而起到活塞242的结合部的作用。
在第二实施例的结构中，活塞杆241、活塞242和活塞头244可以分别模制形成，然后再组装在一起，形成活塞组件240。并且，在组装第二实施例的活塞组件240的过程中，可以将活塞242套设到活塞杆241和活塞头244中的一个上，然后再连接到活塞杆241和活塞242中的另一个上，在此过程中无需将活塞242强行扩径。
当然，也可以用以上在第一实施例中所公开的二次注塑成型工艺来制造该活塞组件240。举例来说，可以首先模制活塞杆241，然后在活塞杆241上模制活塞242，再将预先制成的活塞头244连接到活塞杆241上。或者，可以在模制好的活塞头244上模制活塞242，然后再将活塞头244连同活塞242一起连接到预先制成的活塞杆241上。
另外，如图11所示，在第二实施例的一种较佳变型方式中，在气缸130的内壁上还形成有上凸起部231和下凸起部232。上凸起部231和下凸起部232各自可以是连续的凸环的形式，或者可以是沿着气缸230的周向分布的不连续的突出部的形式。
较佳地，上凸起部231和下凸起部232设置成，当压头210处于其行程上止点时，上凸起部231与活塞242、特别是活塞242的具有较大直径的下圈相接触，而当压头210处于其行程下止点时，下凸起部232与活塞242、特别是活塞242的具有较大直径的下圈相接触。
这样，当开始按压压头210时，上凸起部231与活塞242相接触，增大活塞242与气缸230的内壁之间的摩擦力，使得活塞242能够更快地变形而打开上单向阀。而当撤去施加在压头210上的压力而使得压头210复位时，下凸起部232与活塞242相接触，增大活塞242与气缸230的内壁之间的摩擦力，使得活塞242能够更快地变形而关闭上单向阀。换言之，通过上凸起部231 和下凸起部232的设置，使得上单向阀能够更快地响应而打开或关闭。
本领域技术人员可知，图11中所示的上凸起部231和下凸起部232的结构同样可应用于第一实施例的液体泵100中。
<其它变型结构>
图12和13示出了本发明的液体泵中的活塞组件的其它可能的变型结构。
如图12所示，在第一种变型方式中，安装在活塞杆340上的活塞350包括具有较大直径的下圈351和具有较小直径的结合部352。该结合部352与活塞杆340的凹陷部相配合，并且呈相对于下圈351径向向内凹陷的薄壁部。另外，活塞350的下圈351大致呈锥形的形式。在对液体泵的压头进行按压时，活塞350的下圈351将更易向上变形，从而能够更加快速地打开上单向阀。
如图13所示，在第二种变型方式中，安装在活塞杆440上的活塞450包括下圈451、上圈452和位于下圈451和上圈452之间的结合部453，该结合部453与第一和第二实施例中的相类似，通过沿着径向向内凹陷而形成薄壁部。在上圈452的内侧形成有凸环454，与之相对应地，在活塞杆440上形成有凹槽441。在成型完成之后，活塞450的凸环454嵌入到活塞杆440的凹槽441中。通过凸环454和凹槽441之间的配合，可有助于活塞450的上部与活塞杆440之间的密封配合。

Claims (11)

  1. 一种液体泵，所述液体泵包括压头、牙套和气缸，所述压头的下方连接有活塞杆，所述牙套和所述气缸连接在一起，且所述活塞杆的下端延伸到所述气缸内部，在所述活塞杆上形成有凹陷部，在所述凹陷部中形成有从所述活塞杆的外表面延伸到所述活塞杆的内部空腔的至少一个通孔，其特征在于，
    在所述活塞杆的所述凹陷部处套设有弹性的活塞，所述活塞包括：位于所述活塞的下部的下圈，所述下圈具有第一外径；以及结合部，所述结合部具有小于所述第一外径的第二外径，从而所述结合部相对于所述下圈向内凹陷而形成薄壁部，且所述结合部与所述活塞杆的所述至少一个通孔相配合，形成所述液体泵的上单向阀。
  2. 如权利要求1所述的液体泵，其特征在于，所述活塞具有位于所述活塞的上部的上圈，所述结合部位于所述上圈和所述下圈，其中，所述上圈具有第三外径，所述第三外径小于所述第一外径且大于所述第二外径。
  3. 如权利要求2所述的液体泵，其特征在于，在所述上圈的内表面上形成有凸环，在所述活塞杆上形成有凹槽，当所述活塞安装在所述活塞杆上时，所述凸环嵌入在所述凹槽中。
  4. 如权利要求1所述的液体泵，其特征在于，所述活塞的所述下圈上包括密封面，当所述压头运动到其行程上止点时，所述密封面与所述牙套的伸入到所述气缸中的部分相接触。
  5. 如权利要求1所述的液体泵，其特征在于，所述液体泵还包括气缸盖，所述气缸盖安装在所述牙套上，并且，所述活塞的所述下圈上包括密封面，当所述压头运动到其行程上止点时，所述密封面与所述气缸盖的伸入到所述气缸中的部分相接触。
  6. 如权利要求1所述的液体泵，其特征在于，在所述活塞上还形成有脱模辅助部，所述脱模辅助部有助于在所述活塞成型之后使所述活塞从所述活塞杆剥离。
  7. 如权利要求6所述的液体泵，其特征在于，所述脱模辅助部为形成在所述活塞的所述下圈的上表面上的凹槽或凸起部。
  8. 如权利要求1所述的液体泵，其特征在于，所述液体泵还包括活塞头，所述活塞杆、所述活塞和所述活塞头组装在一起，形成活塞组件。
  9. 如权利要求1所述的液体泵，其特征在于，所述气缸的内壁上形成有：
    上凸起部，当所述压头处于其行程上止点时，所述上凸起部与所述活塞相接触；和/或
    下凸起部，当所述压头处于其行程下止点时，所述下凸起部与所述活塞相接触。
  10. 一种制造如权利要求1～9中任一项所述的液体泵的方法，其特征在于，通过如下步骤来形成所述活塞杆和所述活塞：
    在活塞杆模具中模制所述活塞杆，所述活塞杆模具包括模芯和外模；
    在制成所述活塞杆之后，去除所述外模，将所述模芯保留在所制成的所述活塞杆之中；
    在所述活塞杆的所述凹陷部的位置处套上活塞模具，用于模制所述活塞，所述活塞模具包括径向向内延伸的插片，所述插片的形状对应于所述活塞的所述结合部的形状；
    在制成所述活塞之后，将所述活塞模具和所述活塞杆模具的所述模芯从所述活塞杆和所述活塞上脱下。
  11. 如权利要求10所述的方法，其特征在于，所述活塞杆由第一模制材料制成，所述活塞由第二模制材料制成，
    其中，所述第一模制材料的成型温度高于所述第二模制材料的成型温度；和/或，所述第一模制材料和所述第二模制材料难以粘附在一起。
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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1258236A (zh) * 1997-05-29 2000-06-28 雷克姆斯Sofab股份公司 活节式活塞泵
US20090140009A1 (en) * 2007-11-30 2009-06-04 Pin-Yen Chen Pump for bottle
CN102991839A (zh) * 2011-09-08 2013-03-27 丁要武 使用弹性体活塞的液体泵、活塞组件及其生产方法
CN204307157U (zh) * 2014-11-18 2015-05-06 深圳市安特高科实业有限公司 活塞组件及注射器
CN105397996A (zh) * 2015-12-15 2016-03-16 佛山市川东磁电股份有限公司 一种含有石墨烯的传感器外壳的二次成型工艺和模具结构
CN213110538U (zh) * 2020-07-31 2021-05-04 丁要武 具有弹性活塞的液体泵

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1258236A (zh) * 1997-05-29 2000-06-28 雷克姆斯Sofab股份公司 活节式活塞泵
US20090140009A1 (en) * 2007-11-30 2009-06-04 Pin-Yen Chen Pump for bottle
CN102991839A (zh) * 2011-09-08 2013-03-27 丁要武 使用弹性体活塞的液体泵、活塞组件及其生产方法
CN204307157U (zh) * 2014-11-18 2015-05-06 深圳市安特高科实业有限公司 活塞组件及注射器
CN105397996A (zh) * 2015-12-15 2016-03-16 佛山市川东磁电股份有限公司 一种含有石墨烯的传感器外壳的二次成型工艺和模具结构
CN213110538U (zh) * 2020-07-31 2021-05-04 丁要武 具有弹性活塞的液体泵

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