CN205240242U - Press press pump - Google Patents

Abstract

The utility model provides a press press pump includes: the cylinder, the facing, the cylinder is connected on the facing, pressure head, pressure head have outer lane and inner circle, and inner circle downwardly extending is connected with the facing to the inside of cylinder, outer lane, and the piston, hinge joint is in the lower part of inner circle, wherein, the pressure head can and be opened and move between the position at latched position, and at latched position, the outer lane of pressure head is fixed on the facing, is opening the position, the pressure head upward movement for the outer lane breaks away from the contact with the facing, and the lower extreme of inner circle still extends to the inside of facing or cylinder. The utility model discloses a press press pump simple structure, and the easy molding of each part.

Description

Pressing pump

Technical field

The utility model relates to a kind of Pressing pump, relates in particular to a kind of Pressing pump of four formulas.

Background technology

Traditional push type liquor pump or emulsion pumps are made up of multiple parts conventionally. For example, Fig. 6 a and 6b show oneAt present common push type liquor pump 100 on the market, this liquor pump comprises pressure head 110 and the piston rod 120 being connected with pressure head,Piston rod 120 is gone forward side by side into cylinder 130 from pressure head 110 downsides to downward-extension, is connected with piston 140 in the lower end of piston rod 120. LiquidBody pump 100 also comprises cylinder head 150 and facing 160. Cylinder head 150 is arranged on cylinder 130, and is connected with facing 160, toothOn cover 160, have internal thread, this internal thread matches with the external screw thread of vessel port place that aforesaid liquid pump is installed, and thus willLiquor pump is arranged on container.

Except above-mentioned critical piece, traditional push type liquor pump also comprises spring 170, pad, ball180 other auxiliary components such as grade.

For the traditional liquid pump shown in Fig. 6 a and 6b, its complex structure, number of parts is many, and therefore assembly technology is alsoMore complicated, thus production efficiency is low, and production cost is high. And, in use, because its number of parts is many, mutuallyBetween annexation complexity, the risk therefore breaking down also rises, and causes its service life not long.

Even, if client need to be with look part, need by parts such as pressure head, facing, cylinder head, cylinder, piston rods allBe made into band look part, this has further improved complexity and the production cost produced.

As the improvement of the traditional push type liquor pump to said structure complexity, someone has proposed a kind of new liquid recentlyPump configuration, it has greatly reduced the quantity of part. Fig. 7 a and 7b show the structural representation of this liquor pump 100 '. From figureVisible, this liquor pump comprises pressure head 110 ', is connected to the piston rod 120 ' of pressure head 110 ' below, facing 130 ' and cylinder 140 ',Wherein the effect of original cylinder head is played on the top of facing 130 ', is connected to the top of cylinder 140 '.

The liquid pump structure of this structure is simple, and its main part mainly comprises four, i.e. pressure head 110 ', piston rod120 ', facing 130 ' and cylinder 140 ', therefore number of parts reduces, and its assembling is also simplified. But, because part reduces, forGuarantee to realize the function of liquor pump, the structure of each part is designed to be more complicated, and the particularly structure of piston rod, as figureShown in 7a and 7b, its two diameter is larger, and mid diameter is less, therefore needs during fabrication to make Hough (half) mould. HoughThe difficulty of processing of mould is larger, and working (machining) efficiency is not high yet, and therefore the production efficiency of part is lower all the time.

Therefore, still need a kind of Pressing pump that improves structure that has, so that manufacture and assembling.

Utility model content

The state of the art of the utility model based on above made, and its objective is a kind of improved Pressing pump is provided,This Pressing pump number of parts is few, and each design of part is simple, thereby can efficiently and at low cost manufacture this Pressing pump.

Above-mentioned purpose of the present utility model is by following a kind of Pressing pump, and this Pressing pump comprises:

Cylinder;

Facing, cylinder is connected on facing;

Pressure head, pressure head has outer ring and inner ring, and inner ring extends downwardly into the inside of cylinder, and outer ring is connected with facing; WithAnd

Piston, piston is connected to the bottom of inner ring;

Wherein, pressure head can move between latched position and open position, and in latched position, the outer ring of pressure head is fixed onOn facing, at open position, pressure head moves upward, and outer ring is departed from and the contacting of facing, and the lower end of inner ring still extends toThe inside of described facing or the inside of described cylinder.

In above-mentioned Pressing pump structure of the present utility model, even the inner ring of pressure head pressure head during in use location stillExtend to the inside of cylinder, so just piston can be directly connected to is the inner ring bottom of pressure head on pressure head, specifically. ByThis, omitted the structure of piston rod. And the structure of pressure head of having integrated piston rod function is also fairly simple, be easy to molded, andBe convenient to assembling.

A kind of connected mode between piston and the inner ring of pressure head is on the outer surface of the bottom of inner ring, to be provided with protrudingRing, is provided with scrobicular ring in the interior perimeter surface on the top of piston, and bulge loop and scrobicular ring match.

Or the setting position exchange of bulge loop and scrobicular ring, is provided with scrobicular ring on the outer surface of the bottom of inner ring that is, livesIn the interior perimeter surface on the top of plug, be provided with bulge loop, institute's scrobicular ring and bulge loop match.

In one, preferably in structure, facing has facing endoporus, and the top of inner ring is formed with protruding sealing surface, sealingFace is configured to, and under the state at pressure head in latched position, the inner surface of sealing surface and facing endoporus is sealed and matched. Like this,When pressure head is during in latched position, can prevent from residing in liquid in cylinder from the slot leakage between inner ring and facing.

At another kind, preferably in structure, piston has the first reducing diameter part, accommodates the first valve pearl in the first reducing diameter part,To form upper valve, and/or there is the second reducing diameter part in the body of cylinder, in the second reducing diameter part, accommodate second valve pearl, to formLower valve. Like this, by form reducing diameter part in piston and/or cylinder, to form valve seat, the structure that this can simplify mould, is easy toPart molded.

As travel stop, in facing endoporus, be formed with stage portion, in the time that ram movement arrives stroke top dead centre, pistonUpper surface contact with stage portion, stop further motion upwards of pressure head.

Preferably, in the inwall above the first reducing diameter part and at piston, be provided with the first valve pearl stopping means, and/Or in the inwall above the second reducing diameter part and at cylinder body, be provided with second valve pearl stopping means. The spacing dress of this valve pearlPut and can prevent that valve pearl from dropping out from valve seat.

Further, the first valve pearl stopping means and/or second valve pearl stopping means are sickle shaped. For this kind of structureValve pearl stopping means, by falculate shape, makes this stopping means have certain elasticity. Like this, part is being enteredWhen row is molded, can prevent that stopping means is drawn the distortion of collapsing in the process of the demoulding.

For sealing effectiveness is further provided, the body of cylinder is arranged to comprise upper body and lower body, itsIn, lower body partly extends to upper body inside, thereby lower body extend to part in upper body outsideBetween the interior perimeter surface of perimeter surface and upper body, form annular space; And piston has skirt section, skirt section is by from pistonOuter surface extends radially outwardly, forms to downward-extension; Wherein, the part that extends into upper body of lower bodyOn outer surface, be formed with annular protrusion, under the state at pressure head in latched position, interior perimeter surface and the annular protrusion in skirt sectionSealing contact.

In addition, in the interior perimeter surface of the outer ring of pressure head, be provided with internal thread, on the outer surface of facing, be provided with external screw thread,Internal thread and external screw thread match, and internal thread and external screw thread be configured to, under the state at pressure head in latched position, and interior spiral shellLine is completely in external screw thread below.

Preferably, internal thread herein and/or external screw thread are strong demoulding screw thread, form by forced stripper mechanism modeScrew thread.

In another kind of preferred construction, described facing comprises upside minor diameter and downside major diameter portion, described external screw threadBe formed in described upside major diameter part, and, at outer surface and the described upside minor diameter of described downside major diameter portionOn levelling bench between portion, be formed with annular protrusion with raising up, wherein, when described pressure head is in described latched positionTime, the interior perimeter surface of described annular protrusion and the outer surface of described outer ring contact with each other, or, described annular protrusionGap between interior perimeter surface and the outer surface of described outer ring is little of following degree, that is, described gap can stop because of instituteState outer ring radial and outward deformation and described internal thread and described external screw thread are thrown off mutually.

Such contact or less interstitial structure between interior perimeter surface by annular protrusion and the outer surface of outer ring,Can improve under the state of latched position pressure head from the facing required pulling-out force of leaving behind, exist thereby further improve emulsion pumpsReliability in the processes such as transport.

Brief description of the drawings

Fig. 1 a shows the profile of Pressing pump of the present utility model, and wherein this presses pump head in latched position.

Fig. 1 b shows another profile of Pressing pump of the present utility model, and wherein this presses pump head in opening positionPut.

Fig. 2 a shows the profile of pressing pump head of the present utility model.

Fig. 2 b shows the enlarged drawing of the part A of pressure head shown in Fig. 2 a.

Fig. 3 a shows the profile of the piston of Pressing pump of the present utility model.

Fig. 3 b shows the top view of piston shown in Fig. 3 a.

Fig. 4 a shows the profile of the facing of Pressing pump of the present utility model.

Fig. 4 b shows the front view of the part B of facing shown in Fig. 4 a.

Fig. 5 a shows the profile of the cylinder of Pressing pump of the present utility model.

Fig. 5 b shows the sectional view obtaining along the line I-I in Fig. 5 a.

Fig. 6 a and 6b show the Pressing pump of the prior art of a type.

Fig. 7 a and 7b show the Pressing pump of the prior art of another kind of type.

Detailed description of the invention

Describe detailed description of the invention of the present utility model in detail below in conjunction with accompanying drawing 1a～5b. Should understand accompanying drawingShown in be only preferred embodiment of the present utility model, it does not form the restriction to scope of the present utility model. AbilityThe technical staff in territory can be on the basis of embodiment shown in the drawings to the utility model carry out various apparent amendments,Modification, equivalence are replaced, within these all drop on protection domain of the present utility model.

The "up" and "down" using in this is also noted that literary composition etc. is with respect to Pressing pump about the term of directionBe placed with and be vertically oriented (be Pressing pump be configured to its axis direction consistent with vertical direction) and determine.

As shown in Fig. 1 a and 1b, Pressing pump 1 of the present utility model comprises pressure head 10, facing 20, cylinder 30 and piston 40. ShouldIn Pressing pump 1, be also provided with spring 50, under the effect of this spring 50, the pressure head 10 of Pressing pump 1 can be from the lock shown in Fig. 1 aAllocation moves to the open position shown in Fig. 1 b. Below in conjunction with accompanying drawing, each component part of Pressing pump 1 is said in detailBright.

Fig. 2 a shows the sectional view of the pressure head 10 of Pressing pump 1, and Fig. 2 b is the partial enlarged drawing of the part A in Fig. 2 a.As shown in Figure 2 a, pressure head 10 comprises outlet 11, outer ring 12 and inner ring 13, wherein, and the shape that outer ring 12 and inner ring 13 are tubular, andForm coaxially, in inner ring 13, be formed with inner chamber, this inner chamber is connected with the fluid passage in outlet 11, thereby from being provided withThe liquid of the container of Pressing pump 1 of the present utility model can be via the inner chamber of inner ring 13 from exporting 11 outflows.

In the utility model, inner ring 13 obtains longer to downward-extension than outer ring 12, thereby at the mounted shape of Pressing pump 1Under state, this inner ring 13 extends to cylinder 30 inside. And, on the outer peripheral face of the bottom of inner ring 13, being provided with bulge loop 131, this is protrudingRing 131 matches (as shown in Figure 3 a) with the scrobicular ring of formation on piston 40, thereby piston 40 directly can be connected to inner ring 13Bottom.

On the outer peripheral face on the top of inner ring 13, be formed with protruding sealing surface 132 (clearlying show that in Fig. 2 b). WhenPressure head 10 is in the time of latched position shown in Fig. 1 a, and sealing surface 132 is sealed and matched with the endoporus of facing 20.

Fig. 3 a shows the sectional view of piston 40, and Fig. 3 b shows the top view of piston 40. As shown in Figure 3 a, piston 40Body comprise piston top 41, piston bottom 42 and the intermediate tapered between piston top 41 and piston bottom 4243, wherein, piston top 41 has larger internal diameter, and piston bottom 42 has less internal diameter, the internal diameter of intermediate tapered 43From piston top 41 taper to the less internal diameter of piston bottom 42 downwards compared with large diameter, thereby form the upper valve of Pressing pump 1Valve seat, the first valve pearl 61 can be arranged in this valve seat, to form the upper valve of Pressing pump 1.

On the inner surface on piston top 41, be formed with scrobicular ring 411, as described above, in this scrobicular ring 411 and pressure head 10The bulge loop 131 enclosing on 13 lower, outer perimeter faces matches, thereby piston 40 and the inner ring 13 of pressure head 10 are linked together.

Syndeton between the inner ring 13 of piston 40 and pressure head 10 also can be passed through suitable change. For example, can be at pistonOn the outer peripheral face on 40 piston top 41, form bulge loop, and on the inner peripheral surface of the bottom of inner ring 13, form the scrobicular ring matching;Or, can between piston top 41 and inner ring 13, connect threadably, internal thread and external screw thread are for example set respectively, doFor the replacement to bulge loop/concave ring structure.

Preferably, in order to prevent the first valve pearl 61 from the deviating from compared with large diameter one end of intermediate tapered 43, on piston top41 and intermediate tapered 43 between transition part place be provided with at least one first valve pearl limiting component 44. From Fig. 3 a,A first exemplary valve pearl limiting component 44 can be sickle shaped, and this falculate shape is given the first valve pearl limiting component 44Elasticity to a certain degree.

On the outer peripheral face of piston 40, for example transition part place between piston top 41 and intermediate tapered 43 is provided withSkirt section 45, first this skirt section 45 extends radially outwardly from the outer peripheral face of piston 40, then to downward-extension, thereby round piston 40The outer peripheral face of body is formed as tubular structure, thereby limits between the outer peripheral face of body of piston 40 and the inner peripheral surface in skirt section 45Go out annular space 46. This skirt section 45 preferably with the body coaxial line of piston 40.

Fig. 4 a shows the sectional view of the facing 20 of Pressing pump 1, and Fig. 4 b shows part B in Fig. 4 a, i.e. facing 20The amplification front elevation of upside minor diameter 21. As shown in Fig. 4 a, the primary structure of facing 20 comprise upside minor diameter 21 and underSide major diameter portion 22.

In upside minor diameter 21, be formed with facing endoporus 212, the inner ring 13 of pressure head 10 can prolong through this facing endoporus 212Reach cylinder 30 inside. On the outer surface of upside minor diameter 21 downsides, be formed with external screw thread 211, this external screw thread 211 canMatch with the internal thread 121 forming in the interior perimeter surface in outer ring 12 of pressure head 10, thereby pressure head 10 is remained in latched position.

Preferably, the external screw thread 211 of facing 20 and the internal thread of pressure head 10 121 are the screw thread that strong stripping means forms.

In addition, in the facing endoporus 212 of upside minor diameter 21, also can be formed with at least one stage portion 213. Work as pressure10 while moving upward to its top dead centre under the effect of spring 50, is connected to piston 40 on inner ring 13 lower ends of pressure head 10Upper surface will contact with this stage portion 213, thereby stop pressure head 10 further to move upward, thus this stage portion 213 and pistonMatching in 40 upper surface, forms stop bit mechanism, goes out as shown in Figure 1 b.

On the inner surface of downside major diameter portion 22, be formed with internal thread 221, with this internal thread 221 accordingly, be provided withThe oral area of the container (not shown) of Pressing pump 1 of the present utility model can be provided with external screw thread, when passing through large the downside of facing 20The internal thread 221 of diameter portion 22 matches with the external screw thread of container finish, facing 20 is installed on container, thereby make whole byPress pump 1 is installed on container.

Further, the approximate horizontal between outer surface and the upside minor diameter 21 of downside major diameter portion 22 is flatOn platform, be formed with annular protrusion 23 with raising up. As the sectional view of Fig. 4 a is clearly shown that, annular protrusion 23 comprisesOuter wall, inwall and be connected to outer wall and inwall between connecting portion, thereby at the inner annular spaces that form of annular protrusion 23, shouldAnnular space is for being connected between facing 20 and cylinder 30, and this will be described in more detail below.

In addition, protuberance 23 is also arranged to further, when pressure head 10 is during in latched position, the outer ring 12 of pressure headBetween the interior perimeter surface (being the interior perimeter surface of annular protrusion 23) of the inwall of the annular protrusion 23 of outer surface and facing 20Contact with each other, or gap between this interior perimeter surface and outer surface is enough little, little of stoping outer ring 12 radially outwardBe deformed to the degree that internal thread 121 and external screw thread are thrown off mutually. Like this, in the time that pressure head 10 is subject to pulling force upwards, internal thread121 and external screw thread 211 can be because of outwards distortion slippage mutually of outer ring 12.

Fig. 5 a shows the sectional view of the cylinder 30 of Pressing pump 1 of the present utility model, and Fig. 5 b is along the line in Fig. 5 aThe cut away view that I-I obtains. According to the example arrangement of the cylinder 30 shown in Fig. 5 a, cylinder 30 comprises installation portion 31 and is connected to peaceDress portion 31 below cylinder bodies, this cylinder body further comprises upper body 32, pars intermedia 33 and lower body 34, wherein,Pars intermedia 33 partly extends to upper body 32 inside, thereby in the outer surface of pars intermedia 33 and the interior week of upper body 32Between surface, form annular space. And, stretch at pars intermedia 33 on the outer surface of part of upper body 32 and be also formed withAt least one annular protrusion 332. As shown in Figure 1a, when pressure head 10 is during in latched position, the skirt section 45 of piston 40 extends toIn this annular space between portion's body 32 and pars intermedia 33, and realize sealing contact by this annular protrusion 332.

Between pars intermedia 33 and lower body 34, be formed with stage portion 36, another that this stage portion can support spring 50End.

In lower body 34, comprise convergent portion 341, the internal diameter of this convergent portion 341 convergent from top to bottom, presses thereby formThe valve seat of the lower valve of press pump 1, second valve pearl 62 can be placed on this valve seat. And, similar with upper valve described above, forPrevent that second valve pearl 62 from deviating from, above convergent portion 341, be also provided with at least one second valve pearl limiting section 35, this is second years oldIt is sickle-shaped that valve pearl limiting section 35 is for example also. Preferably, as shown in the I-I profile in Fig. 5 b, can arrange multiple secondValve pearl limiting section 35, these second valve pearl limiting sections 35 circumferentially distribute along the inwall of lower body 34.

Get back to Fig. 1 a and 1b, below by the phase describing in further detail between each parts of Pressing pump 1 of the present utility modelMutually position and annexation, and the operating principle of Pressing pump 1 is described.

As shown in Figure 1a, the pressure head 10 of Pressing pump 1 is in latched position. Wherein, the inner ring 13 of pressure head 10 is through facing 20Facing endoporus 212 extend to cylinder 30 inside, and the internal thread 121 of the outer ring 12 of pressure head 10 and the upside minor diameter of pressure head 10External screw thread 211 in portion 21 matches. Piston 40 is connected to the bottom of inner ring 13 by above-described mode.

The installation portion 31 of cylinder 30 is inserted in the interior annular space of annular protrusion 23 of facing 20, and by installingCooperation between scrobicular ring 231 in bulge loop 311 and annular protrusion 23 in portion 31 and fixing.

Between piston 40 and cylinder 30, be provided with spring 50. Specifically, one end of spring 50 is received within piston 40Skirt section 45 and the body of piston 40 between in the annular space 46 that forms, and the other end of spring 50 is bearing in cylinder 30In stage portion 36 between pars intermedia 33 and lower body 34. Certainly, spring 50 also can be by conventional knot in other this areaStructure is arranged in Pressing pump 1, and applies bias force upwards to piston 40 and then to pressure head 10.

In the state shown in Fig. 1 a, spring 50 is in compressed state, thereby piston 40 is applied to biasing upwardsPower, but due between the external screw thread 211 in the upside minor diameter 21 of the internal thread 121 on the outer ring 12 of pressure head 10 and facing 20Cooperation, make pressure head 10 overcome this bias force of spring 50 and remain in latched position.

Now, as shown in Figure 1a, the sealing surface 132 on the inner ring 13 of pressure head 10 is tight with the facing endoporus 212 of facing 20Contact, is sealed and matched thereby form. In addition upper body 32 and pars intermedia 33 that, cylinder 30 is inserted in the skirt section 45 of piston 40 stretch intoIn the annular space forming between part in this upper body 32, and the interior perimeter surface in skirt section 45 and stretching of pars intermedia 33Enter annular protrusion 332 close contacts of the part place formation of upper body 32, thereby form additional being sealed and matched. At this,The interior perimeter surface in skirt section 45 is preferably the smooth face of cylinder. Further, the lower end of piston 40 extends to the bottom of cylinder 30In body 34, and the external diameter of the lower end of piston 40 preferably equals or is slightly larger than the internal diameter of lower body 34, thereby provides into oneThe sealing effectiveness of step.

Further preferably, in latched position, the internal thread 121 on the outer ring 12 of pressure head 10 is screwed into facing 20 completelyThe outer surface of upside minor diameter 21 on the below of external screw thread 211, in other words, in latched position, internal thread 121 does not haveUpwards exceed the part of external screw thread 211.

As shown in Figure 1 b, make between the internal thread 121 of pressure head 10 and the external screw thread 211 of facing 20 de-by rotary press head 10Open, pressure head 10 is upwards pushed away by spring 50 together with piston 40, until the facing endoporus of the upper surface of piston 40 and facing 20The stage portion 213 of 212 interior formation contacts. Thus, by the upper surface of piston 40 and contacting of stage portion 213, limit pressure head10 stroke top dead centre. Now, the pressure head 10 of Pressing pump 1 is in an open position.

In open position, when the bias force that overcomes spring 50 as end user is pressed pressure head 10 downwards, cylinder 30 and pistonSpace between 40 is compressed, thereby the fluid pressure in this space rises, and the first valve pearl 61 is upwards pressed, and opens thusValve, the second valve pearl 62 of lower valve under the effect of fluid pressure against valve seat, thereby make lower valve in closed condition. ByThis, under pressure, the liquid between cylinder 30 and piston 40 flows in the cavity in inner ring 13 via upper valve, and via going outFlow out fluid passage in mouth 11. Now, in the process that pressure head 10 and piston 40 move downward, due to the external diameter quilt in skirt section 45Be arranged to equal or be slightly larger than the internal diameter of the upper body 32 of cylinder 30, therefore between skirt section 45 and upper body 32, form closeSealing-in is touched, and guarantees thus the pressure in the space between cylinder 30 and piston 40.

Then, end user removes the pressing force being applied on pressure head 10, and pressure head 10 and piston 40 are under the effect of spring 50Move upward. In this process, the first valve pearl 61 falls back in the valve seat that the intermediate tapered 43 of piston 40 forms, thereby onValve cuts out. Along with pressure head 10 and piston 40 rise, space between cylinder 30 and piston 40 increases, and pressure wherein subtracts thusLittle, thus second valve pearl 62 rises under the effect of container internal pressure, opens lower valve, allows the liquid in container to add to gasIn space between cylinder 30 and piston 40, to distribute Pressing pump 1 in the time pressing pressure head 10 next time.

Above preferred embodiments of the present utility model be have been described in detail. It will be apparent to those skilled in the art that alsoCan carry out other distortion and amendment to the utility model, and not exceed scope of the present utility model. For example,, except describing aboveIn preferred embodiments, outside already mentioned mode of texturing, also can carry out following distortion to the utility model.

In above-mentioned preferred embodiment, realize tooth by the annular protrusion 23 of facing 20 and the installation portion 31 of cylinder 30Connection between cover 20 and cylinder 30. As an alternative, can omit this installation portion, the direct outer surface at cylinder bodyUpper formation external screw thread, and on facing 20, for example on the inner surface of upside minor diameter 21, form internal thread, by inside and outside spiral shellCooperation between line realizes the connection between facing 20 and cylinder 30.

In addition, in the structure of the cylinder 30 shown in Fig. 5 a, cylinder body is shown as has three parts that diameter is different,Be upper body 32, pars intermedia 33 and lower body 34, the wherein diameter maximum of upper body 32, the diameter of lower body 34 isLittle, and the diameter of pars intermedia 33 is between two parties, and stage portion between pars intermedia 33 and lower body 34 can be used to one of support springEnd. And in another structure, can cancel pars intermedia 33 these structures, that is, cylinder body only includes upper body and bottom basisBody, the diameter of lower body is less than the diameter of upper body, and a part for lower body stretches into upper body inside. Be placed in useIn the structure of support spring, an annular protruding rib can be set in lower body simply.

Three places that mentioned in above preferred embodiment under the lock-out state of pressure head 10 are sealed and matched, that is, and and inner ring 13Between the facing endoporus of sealing surface and facing 20, the interior perimeter surface in skirt section 45 and the annular protrusion 332 of pars intermedia 33 of piston 40Between and sealing between the bottom of piston 40 and the inner surface of the lower body 34 of cylinder 30 contact. Art technology peopleMember is known, this three place optionally one that is sealed and matched.

In preferred embodiment of the present utility model, the limiting component of valve pearl is sickleshaped, but also can adopt in prior artThe shape that other is conventional or structure.

Except spring, also can make otherwise pressure head to upper offset, for example, can arrange be connected in pressure head inElastic sheet material between circle and/or piston and cylinder inner wall, even can utilize the pressure of the liquid self being stored in cylinder.

Claims (12)

1. a Pressing pump, is characterized in that, described Pressing pump comprises:

Cylinder;

Facing, described cylinder is connected on described facing;

Pressure head, described pressure head has outer ring and inner ring, and described inner ring extends downwardly into the inside of described cylinder, described outer ring and instituteStating facing is connected; And

Piston, described piston is connected to the bottom of described inner ring;

Wherein, described pressure head can move between latched position and open position, in described latched position, and the institute of described pressure headState outer ring and be fixed on described facing, at described open position, described pressure head moves upward, make described outer ring depart from described inThe contact of facing, and the lower end of described inner ring still extends to the inside of described facing or the inside of described cylinder.

2. Pressing pump as claimed in claim 1, is characterized in that, on the outer surface of the described bottom of described inner ring, is provided withBulge loop, is provided with scrobicular ring in the interior perimeter surface on the top of described piston, and described bulge loop and described scrobicular ring match.

3. Pressing pump as claimed in claim 1, is characterized in that, on the outer surface of the described bottom of described inner ring, is provided withScrobicular ring, is provided with bulge loop in the interior perimeter surface on the top of described piston, and institute's scrobicular ring and described bulge loop match.

4. Pressing pump as claimed in claim 1, is characterized in that, described facing has facing endoporus, the top of described inner ringBe formed with protruding sealing surface, described sealing surface is configured to, under the state at described pressure head in described latched position, described inThe inner surface of sealing surface and described facing endoporus is sealed and matched.

5. Pressing pump as claimed in claim 1, is characterized in that, described piston has the first reducing diameter part, in described the first contractingIn the portion of footpath, accommodate the first valve pearl, to form upper valve, and/or there is the second reducing diameter part in the body of described cylinder, described secondIn reducing diameter part, accommodate second valve pearl, to form lower valve.

6. Pressing pump as claimed in claim 4, is characterized in that, is formed with stage portion, when described pressure in described facing endoporusWhen head moves to stroke top dead centre, the upper surface of described piston contacts with described stage portion, stops described pressure head further upwardsMotion.

7. Pressing pump as claimed in claim 5, is characterized in that, above described the first reducing diameter part and at described pistonInwall in be provided with the first valve pearl stopping means, and/or above described the second reducing diameter part and at described cylinder bodyIn inwall, be provided with second valve pearl stopping means.

8. Pressing pump as claimed in claim 7, is characterized in that, described the first valve pearl stopping means and/or described second valvePearl stopping means is sickle shaped.

9. Pressing pump as claimed in claim 1, is characterized in that, the body of described cylinder comprises upper body and bottom originallyBody, wherein, described lower body partly extends to described upper body inside, thereby described in described lower body extends toBetween the interior perimeter surface of the outer surface of the part in upper body and described upper body, form annular space; And, described inPiston has skirt section, and described skirt section is extended radially outwardly, formed to downward-extension by the outer surface from described piston; ItsIn, on the described outer surface of the described part that extends into described upper body of described lower body, be formed with convex annularRise, under the state at described pressure head in described latched position, the interior perimeter surface in described skirt section and the sealing of described annular protrusion connectTouch.

10. Pressing pump as claimed in claim 1, is characterized in that, in the interior perimeter surface of the described outer ring of described pressure head, arrangesHave internal thread, on the outer surface of described facing, be provided with external screw thread, described internal thread and described external screw thread match, and described inInternal thread and described external screw thread are configured to, and under the state at described pressure head in described latched position, described internal thread is completeIn described external screw thread below.

11. Pressing pumps as claimed in claim 10, is characterized in that, described internal thread and/or described external screw thread are the strong demouldingScrew thread.

12. Pressing pumps as claimed in claim 10, is characterized in that, described facing comprises that upside minor diameter and downside are straight greatlyFootpath portion, described external screw thread is formed in described upside major diameter part, and, at the outer surface of described downside major diameter portion andOn levelling bench between described upside minor diameter, be formed with annular protrusion with raising up,

Wherein, when described pressure head is during in described latched position, outside the interior perimeter surface of described annular protrusion and described outer ringPerimeter surface contacts with each other, or the gap between interior perimeter surface and the outer surface of described outer ring of described annular protrusion is littleTo following degree, that is, described gap can stop because of described outer ring radial and outward deformation make described internal thread and described outsideScrew thread is thrown off mutually.