CN206954844U - Foam pump - Google Patents

Abstract

The utility model discloses foam pump, solves the problems, such as the free space deficiency in emulsion room, and can not 360 degree of the shortcomings that going out liquid, its drip irrigation device is, it is equipped with retainer ring and is connected to perforation to seal the seal of perforation, some inner peripheral surfaces for being connected to retainer ring are equipped with the lateral wall of seal so that seal has the elastic valve for being connected to perforation trend, foam pump of the present utility model, seal is set to be pressed in all the time on the pump housing by the elastic valve between retainer ring and seal, it is closed valve, spring is placed on outside simultaneously, the space-consuming of emulsion room can be reduced, to increase the free space of emulsion room, and then lift the liquid outlet quantity of foam pump；Liquid outside emulsion room can enter emulsion room by the interval of retainer ring and seal；Elastic valve can make seal keep abutting state with perforation, so that seal can seal perforation, avoid the liquid in emulsion room by perforating away, in any use direction, be had an impact all without to sealing.

Description

Foam pump

Technical field

It the utility model is related to liquid discharging device using it, more particularly to foam pump.

Background technology

The emulsion articles for use such as the bath oil sold on open market, shampoo, Cleansing Foam, the essence that washes the dishes, are that emulsion is canned In container.In use, or directly remove bottle cap and topple over emulsion, or pressing pressure head outflow emulsion.No matter which kind of method, outflow Emulsion is thick liquid emulsion, whole to be attached directly on washings with sticking together without foam, is not easy to wash washing open.

Notification number be CN2497879 utility model patent disclose a kind of Foam emulsion pump, it include shower nozzle, bottle cap, One-way piston, conduit, spring, the pump housing, upper check valve and lower check valve.The middle part of conduit is provided with the annular wing, the conduit annular wing with Upper part is stretched into the through hole of one-way piston and coordinated with via clearance, conduit lower end stretch into the emulsion room of pump housing bottom and with The internal diameter of emulsion room is slidably matched；Spring is housed between conduit lower end and emulsion room；Band filter is provided between one-way piston top and shower nozzle The net post of net；Sealing ring is provided between the lower surface of the annular wing and one-way piston of conduit；Guide pillar of the upper end with infundibulate valve head Stretched into from conduit upper shed in conduit, the valve head of guide pillar upper end is more than the upper shed of conduit, and the upper shed of conduit and valve head are formed Upper check valve；It is covered with emulsion room above the bead of lower check valve and is axially provided with the spring base that through hole is radially provided with side opening, is led Post lower end is stretched into the axially extending bore of spring base.

Above-mentioned Foam emulsion pump, its operation principle are specific as follows：When with hand, shower nozzle is depressed, shower nozzle drives one-way piston Move downward, the annular wing that one-way piston lower surface presses to conduit makes conduit also move downward, the emulsion top valve opening in emulsion room Head to net post direction spray, while air chamber internal pressure increase, make conduit overcome spring upward pressure and relative to one-way piston to Lower motion, occurs gap between the annular wing and the one-way piston lower surface of conduit, and the pressure-air in air chamber is rapidly through the gap And the gap between conduit and one-way piston through hole internal diameter sprays to net post and is mixed to form foam with the emulsion sprayed out of conduit. After the hand of pressing shower nozzle is unclamped, the air pressure news speed in one side air chamber declines, and conduit will unidirectionally live under spring force Top has simultaneously closed off the gap of the annular wing and one-way piston lower surface to plug upwards, is negative pressure in air chamber, and the air outside air chamber is through bottle The gap between gap and one-way piston and pump housing air chamber internal diameter between lid and shower nozzle is entered in air inlet chamber；On the other hand, lead The upper shed that valve head on post closes conduit makes to produce negative pressure in emulsion room, and the bead of lower check valve opens up, newborn in bottle Liquid is inhaled into emulsion room in case next time uses when depressing shower nozzle.Wherein whole work process, the ring packing muscle of conduit lower end It is all located in emulsion room, that is to say, that air chamber and emulsion room are isolation all the time.This just makes each work week of Foam emulsion pump Phase sucks or the air and the deal of emulsion that spray be just as, namely ensure that the air and emulsion of each work period Mixed proportion be identical；And the mixing of air and emulsion is when shower nozzle is pressed, and is gone out when going out emulsion Air, what it is plus mixing is compressed air, enables air to be sufficiently mixed with emulsion, improves the quality of foam.

Above-mentioned foam pump, its liquid outlet quantity are determined by unclamping the amount of liquid being sucked into after shower nozzle in emulsion room every time, But spring and spring base are equipped with emulsion room, greatly reduce the actual space available of emulsion room, so as to limit into Enter to the liquid capacity in emulsion room, and then reduce the liquid outlet quantity of foam pump, therefore certain room for improvement also be present.

Utility model content

The purpose of this utility model is to provide a kind of foam pump that can increase liquid outlet quantity.

Above-mentioned technical purpose of the present utility model technical scheme is that：

A kind of foam pump, including shower nozzle, bottle cap, upper piston, conduit and the pump housing；The pump housing is a hollow body, its Including the air chamber being from top to bottom sequentially communicated and emulsion room, the internal diameter of the air chamber is more than the internal diameter of emulsion room；The upper piston Through hole is provided with along the direction of motion and is fixed on below shower nozzle, and the external diameter of the upper piston and the internal diameter of air chamber match；The bottle The axial upper shed for offering perforate and covering in air chamber of lid, which is sentenced, limits the upward maximum displacement of upper piston；The shower nozzle passes through bottle The perforate of lid is stretched in air chamber, and the outer peripheral face of the conduit is provided with the annular wing, and the conduit is located at the part above the annular wing Stretch in the through hole of upper piston and coordinate with via clearance, the lower end of the conduit stretch in emulsion room and with emulsion room Interior wall slip coordinates, and the bottom of the emulsion room offers perforation, and the inner peripheral surface of the emulsion room is in the position card close to bottom Embedded with retainer ring, it is equipped with the retainer ring and is connected to perforation to seal the seal of perforation, the lateral surface of the seal Interval is maintained between the inner peripheral surface of retainer ring, is equipped with the lateral wall of the seal and some is connected to the interior of retainer ring Side face is so that seal has the elastic valve for being connected to perforation trend；Being provided between the upper end and emulsion room of the conduit makes work The lower surface of plug keeps mutually abutting the elastic component of state with the annular wing.

Using such scheme, by the elastic valve between retainer ring and seal replace spring in original emulsion room and Spring base, the space-consuming of emulsion room can be effectively reduced, so as to increase the free space in emulsion room, and then lift foam pump Liquid outlet quantity；And the liquid outside emulsion room can be entered in emulsion room by the interval between retainer ring and seal；Elasticity Valve can drive seal to keep mutual with perforation and abut state, so that seal can seal perforation, avoid in emulsion room Liquid is by perforating away；Simultaneously seal and can under the impact of liquid, overcome elastic valve elastic force and perforation produce between Gap, so that the liquid outside emulsion room can be entered in emulsion room by the gap, so as to play a part of one-way conduction；Elasticity Part can be such that the annular wing is not being abutted mutually between the lower surface of upper piston in the case of by external force, so that upper piston and annular There is one-way conduction between the wing.

Preferably, the seal is in the form of annular discs, its external diameter is more than the aperture of perforation；The bottom surface and edge of the emulsion room The edge direction of perforation is surrounded with bulge loop；The inside edge at the lower surface edge and bulge loop upper surface of the seal abuts against.

Using such scheme so that seal can seal perforation completely；Bulge loop can extend to the opening of perforation more Add close to the position of seal so that seal can be more prone to abut against with perforation, so as to the closure speed of lift-off seal part Degree, at the same can also lift-off seal part and perforation between sealing property.

Preferably, the lower surface edge of the seal has the first scarf；The inner side of the bulge loop upper surface Edge has the second scarf abutted against with the first scarf.

Using such scheme, the cooperation between the first scarf and the second scarf, by increasing capacitance it is possible to increase in seal and bulge loop Contact area between lateral edges, the sealing property of further lift-off seal part；Meanwhile between being produced between seal and perforation After gap, the cooperation between the first scarf and the second scarf can make the gap outwards keep certain angle of inclination, so that Liquid outside emulsion room can be entered in emulsion room with the angle, can increase liquid inlet volume, and and can makes the liquid of entrance more It is uniformly smooth, it is not easily blocked.

Preferably, if dry elasticity valve is in arranged at equal intervals, and each elastic valve is in strip setting, and along retainer ring Inner side cambered surface bending；Maintain interval between the outer peripheral face of the elastic valve and the inner peripheral surface of retainer ring, the elastic valve it is interior Interval is maintained between side face and the outer peripheral face of seal；One end of the elastic valve passes through fix bar and the outer peripheral face of seal Mutually fixed, the other end is mutually fixed by fixed block and the inner peripheral surface of retainer ring.

Using such scheme, the elastic valve that curved strip is set can increase its deformation range, and increase seal is with wearing Hole separates caused gap, while can reduce the coefficient of elasticity of elastic valve, so that seal can be more prone to be rushed to open, Gap is produced so as to be more easy to and perforate；And the gap between elastic valve and seal and retainer ring is bigger, make the liquid passed through Body flow is bigger；If by dry elasticity valve arranged at equal intervals, being more uniformly stressed for seal can be made, so as to enter in retainer ring Row is not susceptible to uniformity that is crooked, and then ensureing feed liquor when being axially moved.

It is preferably, fluted in being opened up close to the end face of conduit on the seal.

Using such scheme, after the space in emulsion room is compressed, the liquid in emulsion room is compressed, close so as to extrude The end face of sealing, the inside edge of bulge loop can be firmly pressed on, to seal perforation；Now groove can strengthen emulsion room Impact of the interior liquid to seal end face, power is compressed to perforation with lift-off seal part, so as to increase between seal and perforation Sealing.

Preferably, the inner peripheral surface of the emulsion room is provided with the upper end for being connected in retainer ring in the position ring close to its bottom The snap ring in face.

Using such scheme, snap ring can effectively limit axial location of the retainer ring in emulsion room, and then make seal The bottom of emulsion room can be stably installed at.

Preferably, the upper and lower sides of the snap ring offer arc surface.

Using such scheme, arc surface plays guiding function so that retainer ring can more easily in clamping to snap ring, from And lift the installation effectiveness of snap ring.

Preferably, one end on the conduit close to emulsion room is provided with the lower piston being placed in emulsion room, it is described The external diameter of lower piston and the internal diameter of emulsion room match；Also include the endoporus and conduit for being from the bottom up arranged in lower piston successively Lower end and the guide pillar for being connected in conduit lower end；Between the lateral wall of the guide pillar and the madial wall of conduit and the endoporus of lower piston Maintain gap.

Using such scheme, lower piston can increase the sealing between the lateral wall of conduit lower end and emulsion chamber interior walls, Axial location between lower piston and conduit lower end can effectively be limited by guide pillar so that conduit can be by guide pillar stably Lower piston is driven to carry out the linear reciprocating motion of axial direction, so that the space in emulsion room is by conduit during being compressed, emulsion Indoor liquid can only between the lateral wall and the madial wall of conduit and the endoporus of lower piston of guide pillar by and can not be under By and then making space in emulsion room liquid will not be revealed during by compression between piston and emulsion room.

Preferably, the bottom of the emulsion room is plugged with the suction pipe for being communicated in perforation.

Using such scheme, the liquid in body can be fully drawn by suction pipe emulsion room, without by bottle The influence of middle liquid level.

In summary, the utility model has the advantages that：Pass through the elastic valve generation between retainer ring and seal For the spring and spring base in original emulsion room, the space-consuming of emulsion room can be effectively reduced, so as to increase in emulsion room Free space, and then lifted foam pump liquid outlet quantity；And the liquid outside emulsion room can be by between retainer ring and seal Interval enter in emulsion room；Elastic valve can drive seal to keep mutual with perforation and abut state, so that seal energy Perforation is enough sealed, avoids the liquid in emulsion room by perforating away；Seal and can overcomes bullet under the impact of liquid simultaneously Property valve elastic force and produce gap with perforation so that the liquid outside emulsion room can be entered by the gap in emulsion room, from And play a part of one-way conduction；Elastic component can make the annular wing not in the case of by external force between the lower surface of upper piston Mutually abut, so as to which there is one-way conduction between upper piston and the annular wing.

Brief description of the drawings

Fig. 1 is the sectional view of the present embodiment；

Fig. 2 is the enlarged diagram in A portions shown in Fig. 1；

Fig. 3 is the enlarged diagram in B portions shown in Fig. 1；

Fig. 4 is the explosive view of the present embodiment；

Fig. 5 is the plan of seal in the present embodiment.

In figure：1st, shower nozzle；2nd, bottle cap；3rd, upper piston；4th, conduit；5th, the pump housing；6th, air chamber；7th, emulsion room；8th, through hole；9th, ring The shape wing；10th, perforate；11st, retainer ring；12nd, seal；13rd, elastic valve；14th, elastic component；15th, bulge loop；16th, the first scarf； 17th, the second scarf；18th, fix bar；19th, fixed block；20th, groove；21st, snap ring；22nd, arc surface；23rd, lower piston；24th, lead Post；25th, suction pipe；26th, limited block；27th, buckle；28th, net post.

Embodiment

The utility model is described in further detail below in conjunction with accompanying drawing.

This specific embodiment is only that it is not to limitation of the present utility model, ability to explanation of the present utility model Field technique personnel can make the modification of no creative contribution to the present embodiment as needed after this specification is read, but As long as all protected in right of the present utility model by Patent Law.

A kind of foam pump disclosed in the present embodiment, as shown in figure 1, including shower nozzle 1, bottle cap 2, upper piston 3, conduit 4 and pump Body 5；The pump housing 5 is a hollow body, and it includes the air chamber 6 being from top to bottom sequentially communicated and emulsion room 7.Wherein, air chamber 6 is interior Footpath is more than the internal diameter of emulsion room 7, and both are in be arranged concentrically.

Upper piston 3 is provided with through hole 8 along the direction of motion and is fixed on the lower section of shower nozzle 1, and the external diameter of upper piston 3 is interior with air chamber 6 Footpath matches so that can be in the state sealed against each other between the two.Bottle cap 2 axially offers perforate and covers in the upper of air chamber 6 Opening is to limit the upward maximum displacement of upper piston 3.Shower nozzle 1 is stretched in air chamber 6 by the perforate of bottle cap 2, outside conduit 4 Side face is equipped with the annular wing 9.Conduit 4 is stretched in the through hole 8 of upper piston 3 and between through hole 8 positioned at the part of the annular top of the wing 9 Gap coordinates, and the lower end of conduit 4 stretches in emulsion room 7 and coordinated with the interior wall slip of emulsion room 7, while the lower end position of conduit 4 In close to the position on the top of emulsion room 7.

As shown in Fig. 2 one end on conduit 4 close to emulsion room 7 is provided with the lower piston 23 being placed in emulsion room 7, under The external diameter of piston 23 and the internal diameter of emulsion room 7 match.Also include being arranged in the endoporus of lower piston 23 successively from the bottom up and leading The lower end of pipe 4 and the guide pillar 24 for being connected in the lower end of conduit 4.The lower end of the guide pillar 24 is fixed with for the spacing of support lower piston 23 Block 26, the upper end of guide pillar 24 are extended with buckle 27, and the buckle 27 wears and is connected among the inner circle of conduit 4, to limit lower live Position to axial between plug 23 and conduit 4.

Gap is maintained between the lateral wall of guide pillar 24 and the madial wall of conduit 4 and the endoporus of lower piston 23, for Liquid passes through.

As shown in figure 3, the bottom of emulsion room 7 offers perforation 10, the bottom of emulsion room 7, which is plugged with, is communicated in perforation 10 Suction pipe 25.The inner peripheral surface of emulsion room 7 has retainer ring 11 in the position inlay card close to bottom, and the internal diameter of the retainer ring 11 is more than perforation 10 aperture.The inner peripheral surface of emulsion room 7 is provided with the snap ring for the upper surface for being connected in retainer ring 11 in the position ring close to its bottom 21.The upper and lower sides of snap ring 21 offer arc surface 22.

It is equipped with retainer ring 11 and is connected to perforation 10 to seal the seal 12 of perforation 10, the seal 12 is in disk Shape, its end face perpendicular to emulsion room 7 length direction, and positioned at retainer ring 11 center；The external diameter of seal 12 simultaneously More than the aperture of perforation 10.Fluted 20 are opened up in the end face close to conduit 4 on seal 12, the groove 20 is preferably disposed on close The end face center of sealing 12.

The bottom surface of emulsion room 7 is simultaneously surrounded with bulge loop 15 along the edge direction of perforation 10, the lower surface edge of seal 12 with The inside edge of the upper surface of bulge loop 15 abuts against.Further, the lower surface edge of seal 12 has the first scarf 16；The inside edge of the upper surface of bulge loop 15 offers the second scarf 17 abutted against with the first scarf 16.

As shown in figure 4, interval is maintained between the lateral surface of seal 12 and the inner peripheral surface of retainer ring 11, seal 12 Some inner peripheral surfaces for being connected to retainer ring 11 are equipped with lateral wall so that seal 12 has the bullet for being connected to 10 trend of perforation Property valve 13.

As shown in figure 5, if dry elasticity valve 13 is in arranged at equal intervals, its quantity is preferably three, and each elastic valve 13 is in Strip is set, and its width is less than the interval between retainer ring 11 and seal 12, and the arc of the inner side cambered surface along retainer ring 11 Spend direction bending.Meanwhile interval is maintained between the outer peripheral face of elastic valve 13 and the inner peripheral surface of retainer ring 11, elastic valve 13 it is interior Interval is maintained between the outer peripheral face of side face and seal 12, with allow the liquid to pass through seal 12 and retainer ring 11 it Between gap.

One end of elastic valve 13 is mutually fixed by fix bar 18 and the outer peripheral face of seal 12, and the other end passes through fixed block 19 Mutually fixed with the inner peripheral surface of retainer ring 11 so that the length direction of elastic valve 13 can with the outside cambered surface of seal 12 and The inner side cambered surface of retainer ring 11 is parallel to each other, and seal 12 is connected with retainer ring 11 by elastic valve 13.

Wherein, retainer ring 11, seal 12, elastic valve 13, fix bar 18 and fixed block 19 are preferably made from plastic, And it is in be wholely set.

Being provided between the upper end of conduit 4 and emulsion room 7 makes the lower surface of upper piston 3 keep mutually abutting shape with the annular wing 9 The elastic component 14 of state.The elastic component 14 is preferably stage clip, and on conduit 4, its one end is connected under the annular wing 9 compression spring sleeve End face, the other end are connected to the lower end of air chamber 6.The lower surface of air chamber 6 offers the annular groove for being surrounded on the opening of emulsion room 7 simultaneously, The lower end of stage clip is placed in the annular groove, to provide more accommodation spaces for stage clip so that stage clip by compression during, Its steel ring can be placed in annular groove, so as to lift the compression distance of stage clip, to increase stroke when conduit 4 pushes, further Lift the liquid outlet quantity of foam pump.

Specific work process is as follows：

When with hand, shower nozzle 1 is depressed, shower nozzle 1 drives upper piston 3 to move downward, and the lower surface of upper piston 3 presses to the ring of conduit 4 The shape wing 9 makes conduit 4 also move downward；Conduit 4 by lower piston 23 by the space compression in emulsion room 7, while in emulsion room 7 Groove 20 on hydraulic shock seal 12, so that seal 12 can be firmly connected on bulge loop 15, to seal perforation 10, make The liquid obtained in emulsion room 7 can only be entered in conduit 4 by the gap between guide pillar 24 and lower piston 23 and conduit 4, and Sprayed by conduit 4 to the direction of net post 28；The internal pressure increase of air chamber 6 simultaneously, make conduit 4 overcome the upward elastic force of elastic component 14 and Move downward, occur gap under the influence of air pressure between the lower surface of the annular wing 9 and upper piston 3, so that the high pressure in air chamber 6 Air sprays to net post 28 through the gap between the gap and conduit 4 and the internal diameter of 3 through hole of upper piston 8 rapidly, and with out of conduit 4 The liquid of ejection is mixed to form foam.

When unclamp pressing shower nozzle 1 hand after, conduit 4 elastic component 14 elastic force effect under reset, with drive upper piston 3 with Lower piston 23 moves up, so as to make the air pressure in air chamber 6 and emulsion room 7 decline rapidly respectively.Meanwhile the annular wing 9 with it is upper Space closure between the lower surface of piston 3, is negative pressure in air chamber 6, and the air outside air chamber 6 is through the gap between bottle cap 2 and shower nozzle 1 And the gap between upper piston 3 and the internal diameter of 5 air chamber of the pump housing 6 is entered in air inlet chamber 6.

On the other hand, due to producing negative pressure in emulsion room 7 so that seal 12 can overcome the elastic force of elastic valve 13 upward The displacement of certain distance occurs, so that seal 12 produces gap with bulge loop 15, so that the liquid outside foam pump can pass through The gap is sucked into emulsion room 7, in case next time uses.By pressing shower nozzle 1 repeatedly, the constantly output bubble of shower nozzle 1 just can be made Foam liquid.

Meanwhile the foam pump can also overcome can not 360 degree of the shortcomings that going out liquid, in any use direction, all without to sealing Have an impact.

Claims (9)

1. a kind of foam pump, including shower nozzle (1), bottle cap (2), upper piston (3), conduit (4) and the pump housing (5)；The pump housing (5) is One hollow body, it includes the air chamber (6) being from top to bottom sequentially communicated and emulsion room (7), the internal diameter of the air chamber (6) are more than The internal diameter of emulsion room (7)；The upper piston (3) is provided with through hole (8) along the direction of motion and is fixed on below shower nozzle (1), it is described on The internal diameter of the external diameter of piston (3) and air chamber (6) matches；The bottle cap (2) axially offers perforate and covers in the upper of air chamber (6) Opening is to limit the upward maximum displacement of upper piston (3)；The shower nozzle (1) stretches to air chamber (6) by the perforate of bottle cap (2) Interior, the outer peripheral face of the conduit (4) is provided with the annular wing (9), and the part that the conduit (4) is located above the annular wing (9) stretches to Coordinate in the through hole (8) of upper piston (3) and with through hole (8) gap, the lower end of the conduit (4) is stretched in emulsion room (7) simultaneously Coordinate with the interior wall slip of emulsion room (7), it is characterized in that：The bottom of the emulsion room (7) offers perforation (10), the emulsion The inner peripheral surface of room (7) has retainer ring (11) in the position inlay card close to bottom, is equipped with to be connected in the retainer ring (11) and wears Hole (10) to seal the seal (12) of perforation (10), the lateral surface of the seal (12) and the inner peripheral surface of retainer ring (11) it Between maintain interval, some inner peripheral surfaces for being connected to retainer ring (11) are equipped with the lateral wall of the seal (12) so that close Sealing (12) has the elastic valve (13) for being connected to perforation (10) trend；Set between the upper end and emulsion room (7) of the conduit (4) There is the elastic component (14) for making the lower surface of upper piston (3) keep mutually abutting state with the annular wing (9).

2. foam pump according to claim 1, it is characterized in that：The seal (12) is in the form of annular discs, and its external diameter, which is more than, to be worn The aperture in hole (10)；The bottom surface of the emulsion room (7) is simultaneously surrounded with bulge loop (15) along the edge direction of perforation (10)；The sealing The inside edge at the lower surface edge of part (12) and bulge loop (15) upper surface abuts against.

3. foam pump according to claim 2, it is characterized in that：The lower surface edge of the seal (12) has first Scarf (16)；The inside edge of bulge loop (15) upper surface offers the second beveling abutted against with the first scarf (16) Face (17).

4. foam pump according to claim 1, it is characterized in that：If dry elasticity valve (13) is in arranged at equal intervals, and each bullet Property valve (13) set in strip, and along the inner side cambered surface bending of retainer ring (11)；The outer peripheral face of the elastic valve (13) is with consolidating Determine to maintain interval between the inner peripheral surface of ring (11), between the inner peripheral surface of the elastic valve (13) and the outer peripheral face of seal (12) Maintain interval；One end of the elastic valve (13) is mutually fixed by fix bar (18) and the outer peripheral face of seal (12), another End is mutually fixed by fixed block (19) and the inner peripheral surface of retainer ring (11).

5. foam pump according to claim 1, it is characterized in that：In close to the end face of conduit (4) on the seal (12) Open up fluted (20).

6. foam pump according to claim 1, it is characterized in that：The inner peripheral surface of the emulsion room (7) is in close to its bottom Position ring is provided with the snap ring (21) for the upper surface for being connected in retainer ring (11).

7. foam pump according to claim 6, it is characterized in that：The upper and lower sides of the snap ring (21) offer arc surface (22)。

8. according to the foam pump described in any one of claim 1 to 7, it is characterized in that：Close to emulsion room (7) on the conduit (4) One end be provided with the lower piston (23) being placed in emulsion room (7), the external diameter of the lower piston (23) is interior with emulsion room (7) Footpath matches；Also include being arranged in the endoporus of lower piston (23) and the lower end of conduit (4) successively from the bottom up and being connected in conduit (4) guide pillar (24) of lower end；The endoporus of the lateral wall of the guide pillar (24) and the madial wall of conduit (4) and lower piston (23) it Between maintain gap.

9. foam pump according to claim 1, it is characterized in that：The bottom of the emulsion room (7), which is plugged with, is communicated in perforation (10) suction pipe (25).