CN213975249U - Pump head structure for emulsion tank - Google Patents

Abstract

The utility model relates to a pump head structure for emulsion jar, it includes the lid, with the lid head cap that slides and be connected, return down the gum cover that resets that backstop and bottom and lid are connected, be provided with the stop cock in the head cap, and set up the infusion passageway with external intercommunication in the stop cock, the gum cover top that resets is provided with the backstop ring, the gum cover that resets all has elasticity with the backstop ring, backstop ring cover is located on the stop cock, and the infusion passageway passes through backstop ring and negative pressure chamber intercommunication, set up negative pressure chamber and the drainage mouth that communicates with negative pressure chamber in the gum cover that resets, the gum cover that resets takes place deformation and negative pressure chamber capacity and reduces when the head cap slides, the drainage mouth is through the straw intercommunication in backstop and the bottle down, lower backstop is used for making liquid one-way entering negative pressure chamber in the bottle. This application has the effect that reduces the influence of liquid pressure surge to the pump head in order to prolong pump head life.

Description

Pump head structure for emulsion tank

Technical Field

The application relates to the field of pump heads, in particular to a pump head structure for an emulsion tank.

Background

The pump is an apparatus for transferring or pressurizing liquid, and the pump head refers to a structure for extruding liquid on the top of a bottle body such as cosmetics, shampoo and spray or a tank body such as a lotion tank.

The pump head of the emulsion tank generally comprises a sealing cover 1, a piston 12, a spring 13, a nozzle 14, a suction pipe 15, an upper one-way valve 16 and a lower one-way valve 17, wherein the sealing cover 1 is used for being connected with a bottle body, a cavity 11 is formed in the sealing cover 1, a channel communicated with the cavity 11 is formed in the nozzle 14, and the piston 12 and the nozzle 14 are fixed and slidably arranged in the cavity 11. The upper one-way valve 16 is covered on the opening of one end of the nozzle 14, the lower one-way valve 17 is covered on the opening of the top end of the suction pipe 15, one end of the suction pipe 15 is communicated with the lower one-way valve 17, the other end is inserted under the liquid level of the liquid in the bottle, and the two ends of the spring 13 are respectively connected with the sealing cover 1 and the nozzle 14.

The lower check valve 17 is provided to allow one-way flow of water into the cavity 11, and the upper check valve 16 is provided to allow one-way ejection of water from the cavity 11 out of the nozzle 14. When the user presses the nozzle 14, the air in the cavity 11 is exhausted out of the cavity 11 along the upper one-way valve 16, then the user releases the nozzle 14, the nozzle 14 is reset under the action of the spring 13, the cavity 11 generates negative pressure to enable the liquid in the bottle body to enter the cavity 11 along the lower one-way valve 17, and when the user presses the nozzle 14 again, the liquid is sprayed out along the built-in channel of the nozzle 14, so that the liquid pumping effect is achieved.

In view of the above-mentioned related technologies, the inventor believes that there is a defect that the pressure in the cavity 11 rises suddenly when the nozzle 14 is pressed down with force, so that the upper check valve 16 is easily damaged by the violent impact of the water flow, thereby affecting the next liquid pumping and shortening the service life of the pump head.

SUMMERY OF THE UTILITY MODEL

In order to reduce the influence of liquid pressure surge to the pump head, extension pump head life, this application provides a pump head structure for emulsion jar.

The application provides a pair of pump head structure for emulsion jar adopts following technical scheme:

the utility model provides a pump head structure for emulsion jar, includes the lid and slides the first cap of being connected with the lid, still includes the gum cover that resets that ends contrary spare and bottom and lid are connected down, be provided with the stop cock in the first cap, and set up the infusion passageway with external intercommunication in the stop cock, the gum cover top that resets is provided with the check ring, and the gum cover that resets all has elasticity with the check ring, and the check ring cover is located on the stop cock, and the infusion passageway passes through check ring and negative pressure chamber intercommunication, sets up negative pressure chamber and the drainage mouth that communicates with negative pressure chamber in the gum cover that resets, the gum cover that resets takes place deformation and negative pressure chamber capacity and reduces when the head cap slides, the drainage mouth is through the straw intercommunication in end contrary spare and the bottle down, just end contrary spare is used for making the interior one-way negative pressure chamber that gets into of liquid of bottle down.

By adopting the technical scheme, when a user presses the head cap, the reset rubber sleeve is extruded and deformed, so that the capacity of the negative pressure cavity is reduced, the pressure is increased, air or liquid pushes the check ring to expand under the pressure action, a gap for gas or liquid to flow is formed between the inner wall of the check ring and the outer wall of the limiting bolt, an annular channel is formed, the infusion channel and the negative pressure cavity are communicated, and the liquid is led into the infusion channel from the negative pressure cavity and is ejected; the liquid impacts along the gap between the check ring and the limiting bolt when impacting, so that the direct impact on the check ring is reduced, the check ring is prevented from being damaged, and the service life of the pump head is prolonged; when the user loosens the head cap, the reset rubber sleeve resets under the action of the elasticity of the user, so that the capacity of the negative pressure cavity is increased, the pressure is reduced, a negative pressure environment is generated, at the moment, the liquid in the bottle enters the negative pressure cavity through the lower check piece, and the circulation is repeated, so that the pumping of the liquid in the bottle is realized.

Preferably, a liquid discharge hole for communicating the negative pressure cavity with the infusion channel is formed in the reset rubber sleeve, a check rod penetrates through the liquid discharge hole, the top end of the check rod is connected with the head cap, and a flow limiting ring with the outer diameter larger than the opening diameter of the liquid discharge port is fixedly sleeved on the bottom end of the check rod.

By adopting the technical scheme, when the head cap is pressed down, the non-return rod slides along with the head cap, the reset rubber sleeve generates compression deformation at the moment, the length of the liquid discharge hole is shortened, and the opening of the liquid discharge hole originally blocked by the flow limiting ring is opened at the moment, so that the negative pressure cavity is communicated with the liquid discharge hole and the infusion channel, and liquid is conveniently led out from the negative pressure cavity; and when the resetting rubber sleeve resets, the opening edge of the liquid discharge hole is propped against the flow-limiting ring again, so that the negative pressure cavity is prevented from being influenced by air intake to form a negative pressure environment.

Preferably, an installation groove is formed in the head cap, and the top end of the reset rubber sleeve is in inserting fit with the installation groove.

By adopting the technical scheme, the top end of the reset rubber sleeve is in plug-in fit with the mounting groove, so that the reset rubber sleeve is convenient to mount, and the transverse deflection of the reset rubber sleeve is reduced by the contact between the mounting groove and the peripheral side wall of the reset rubber sleeve, so that the stability of the reset rubber sleeve is improved; meanwhile, the reset rubber sleeve closes the bottom opening of the infusion channel, so that liquid leakage is avoided, and the sealing performance is improved.

Preferably, the circumferential side wall of the non-return rod is provided with protruding strips along the length direction, and at least two protruding strips are distributed at intervals along the circumferential direction of the non-return rod.

Through adopting above-mentioned technical scheme, the sand grip is along non return rod circumference interval distribution to this makes and forms the passageway that supplies the liquid circulation between the adjacent sand grip, promotes the flux of liquid, makes the outage shrink and hinder the liquid circulation when avoiding resetting the gum cover and receiving the extrusion.

Preferably, be provided with the flange on the outside bottom edge of headgear, an organic whole is provided with the snap ring on the opening inner wall in lid top, and the snap ring all is the ring form with the flange, and flange and snap ring butt when the headgear is connected the back flange and is located the snap ring below and headgear slides.

Through adopting above-mentioned technical scheme, when the head cap inserts in the opening of pipe form lid top in the flange surpassed the snap ring and got into in the lid to restrict the head cap in the lid, and realize that the head cap is connected with the vertical slip of lid.

Preferably, a liquid outlet communicated with the suction pipe is formed in the bottom of the cover body, the lower backstop comprises a movable plug covering the liquid outlet, and an elastic part is connected between the movable plug and the cover body.

By adopting the technical scheme, the elastic piece is used for realizing the reset of the movable plug, when the pressure of the negative pressure cavity is smaller than a set pressure value, the liquid in the bottle overcomes the elastic force of the elastic piece to enable the movable plug and the liquid outlet to generate a gap, so that the liquid enters the negative pressure cavity; and under other states, the movable plug supports the liquid outlet tightly through the elastic sheet, and the liquid in the negative pressure cavity is prevented from returning to the bottle.

Preferably, the elastic piece comprises an elastic sheet fixed to the side wall of the movable plug, and the other end of the elastic sheet extending along the circumferential direction of the movable plug is connected with the cover body.

Through adopting above-mentioned technical scheme, the shell fragment is used for realizing reseing of activity stopper, and the shell fragment extends along activity stopper circumference, can promote the sensitivity that the activity stopper responded negative pressure chamber pressure variation when providing the support to the activity stopper.

Preferably, a slot is formed in the cover body, the bottom end of the reset rubber sleeve is in plug-in fit with the slot, a check ring is sleeved on the outer side wall of the negative pressure cavity on the reset rubber sleeve, and the check ring is in clamping fit with the slot.

Through adopting above-mentioned technical scheme, keep off the snare and locate on the gum cover that resets and lie in the lateral wall in negative pressure chamber to this provides the holding power when the gum cover deformation that resets outwards bulges, avoids the gum cover that resets excessively to warp and damage on the one hand, and on the other hand avoids the gum cover that resets to take place the skew and makes the capacity variation range in negative pressure chamber reduce and lead to out the liquid volume and reduce, avoids the local deformation aggravation of gum cover that resets to produce the crease and damage simultaneously.

Drawings

FIG. 1 is a schematic diagram of a pump head according to the background art of the present application;

FIG. 2 is a schematic diagram of the overall structure of an embodiment of the present application;

FIG. 3 is a schematic diagram of an exploded structure of an embodiment of the present application, showing primarily a backstop rod;

FIG. 4 is a schematic cross-sectional view of the pump head structure of the embodiment of the present application along the radial direction of the cover, mainly showing the negative pressure chamber;

fig. 5 is a schematic structural diagram of a fixing ring according to an embodiment of the present application.

Description of reference numerals: 1. sealing the cover; 11. a cavity; 12. a piston; 13. a spring; 14. a nozzle; 15. a straw; 16. an upper one-way valve; 17. a lower check valve; 2. a cover body; 21. mounting grooves; 22. a liquid outlet; 23. a circular groove; 24. a slot; 25. a snap ring; 3. a head cap; 31. a fluid infusion channel; 32. a flange; 4. an upper backstop; 41. a limit bolt; 42. a non-return lever; 421. a convex strip; 43. a flow-limiting ring; 44. an adjustment section; 5. a lower backstop; 51. a movable plug; 52. an elastic member; 53. a fixing ring; 6. resetting the rubber sleeve; 61. a negative pressure chamber; 62. a drainage opening; 63. a non-return ring; 64. a drain hole; 65. a retainer ring; 66. and (5) a rubber ring.

Detailed Description

The present application is described in further detail below with reference to the accompanying drawings.

The embodiment of the application discloses pump head structure for emulsion jar. Referring to fig. 2 and 3, the pump head structure for the emulsion tank includes a cover body 2, a head cap 3, an upper backstop 4, a lower backstop 5 and a reset rubber sleeve 6, wherein the bottom of the cover body 2 is provided with internal threads for being in threaded fit with the internal threads at the bottle mouth of the bottle body, thereby connecting the pump head structure and the bottle body. The reset rubber sleeve 6 has elasticity, the top end of the reset rubber sleeve is connected with the head cap 3, and the bottom end of the reset rubber sleeve is connected with the cover body 2.

Referring to fig. 3 and 4, the head cap 3 is connected with the cover body 2 in a sliding manner, a transfusion channel 31 is arranged in the head cap, and a negative pressure cavity 61 is arranged in the reset rubber sleeve 6. When a user presses the head cap 3, the reset rubber sleeve 6 deforms and the reset rubber sleeve 6 is extruded and deformed, so that the capacity of the negative pressure cavity 61 is reduced, the pressure is increased, and air or liquid enters the infusion channel 31 through the upper backstop 4 under the action of the pressure and is sprayed out; when the user loosens the head cap 3, the reset rubber sleeve 6 resets under the action of the elasticity of the user, so that the capacity of the negative pressure cavity 61 is increased, the pressure is reduced, at the moment, the liquid in the bottle enters the negative pressure cavity 61 through the lower check piece 5, and the liquid in the bottle is pumped in a circulating reciprocating manner.

Wherein, the bottom opening of the head cap 3 is circular, the bottom edge of the outer side is integrally provided with an annular flange 32, the inner wall of the top opening of the cover body 2 is integrally provided with a snap ring 25, and the snap ring 25 and the flange 32 are both annular. And the head cap 3 and the cover body 2 are both made of plastic materials, therefore, when the head cap 3 is inserted into the opening at the top of the circular tube-shaped cover body 2, the flange 32 crosses the snap ring 25 to enter the cover body 2, thereby limiting the head cap 3 in the cover body 2 and realizing the vertical sliding connection of the head cap 3 and the cover body 2.

The infusion channel 31 is L-shaped, the bottom opening of the infusion channel is circular and is opposite to the top end of the reset rubber sleeve 6, the upper backstop 4 comprises a limit bolt 41 which is connected with the inner wall of the cover body 2 at the turning part of the infusion channel 31, and the limit bolt 41 is circular tube-shaped and is integrally formed with the cover body 2. The top end of the reset rubber sleeve 6 is integrally provided with an elastic check ring 63, the check ring 63 is sleeved on the limit bolt 41, when the inner diameter of the check ring 63 is enlarged due to the increase of the pressure in the negative pressure cavity 61, an annular channel for communicating the transfusion channel 31 with the negative pressure cavity 61 is formed between the check ring 63 and the peripheral side wall of the limit bolt 41, and when the pressure in the negative pressure cavity 61 is not enough to expand the check ring 63, the annular channel is closed, so that the air backflow is avoided, and the liquid pumping is realized.

The top of the resetting rubber sleeve 6 is positioned between the check ring 63 and the negative pressure cavity 61 and is provided with a circular liquid discharge hole 64, the negative pressure cavity 61 and the transfusion channel 31 are communicated through the liquid discharge hole 64, the upper check piece 4 further comprises a check rod 42, the check rod 42 is in a circular rod shape and penetrates through the liquid discharge hole 64, and the top end of the check rod is inserted into an opening of the limiting bolt 41 and is in interference fit or bonded and fixed with the limiting bolt 41. The end of the non-return rod 42 inserted into the negative pressure cavity 61 is fixedly sleeved with a flow limiting ring 43, the flow limiting ring 43 and the non-return rod 42 are integrally formed, and the outer diameter of the flow limiting ring 43 is larger than the diameter of the liquid discharge port and is used for controlling the opening and closing of the liquid discharge port.

The circumferential side wall of the check rod 42 is integrally provided with protruding strips 421 along the length direction thereof, and at least two protruding strips 421 are arranged at intervals along the circumferential direction of the check rod 42. One side of sand grip 421 and outage 64 inner wall butt to this supports gum cover 6 that resets, makes to form the passageway that supplies the liquid circulation between the adjacent sand grip 421, promotes the flux of liquid, makes the outage 64 shrink when avoiding resetting gum cover 6 and hinder the liquid circulation.

And seted up circular mounting groove 21 in the hood 3, the mounting groove 21 opening just is relative with the gum cover 6 that resets down, and it cooperates with one section grafting that is located the outage 64 outside on the gum cover 6 that resets to this installation of convenient gum cover 6 that resets, and reduce the lateral deflection that resets gum cover 6 through the mounting groove 21 and the contact of the 6 week lateral walls of gum cover that resets, promote the stability that resets gum cover 6.

The bottom of the resetting rubber sleeve 6 is provided with a drainage port 62, one side of the drainage port 62 is communicated with the negative pressure cavity 61, the inner diameter of the drainage port 62 is smaller than the minimum inner diameter of the negative pressure cavity 61, the other side of the drainage port is communicated with the lower backstop 5 and is communicated with the suction pipe 15 in the bottle body through the lower backstop 5, and therefore the function of leading liquid in the bottle into the negative pressure cavity 61 is achieved.

The negative pressure cavity 61 of the resetting rubber sleeve 6 is in a circular truncated cone shape or a cylindrical shape, so that the side wall of the resetting rubber sleeve 6 is uniformly deformed and generates an annular convex part when the head cap 3 is pressed down, and the crease caused by excessive local deformation is reduced. And the thickness of the side wall of the resetting rubber sleeve 6 at the negative pressure cavity 61 is smaller than the thickness of the side wall of the liquid discharge hole 64 and the drainage port 62, so that the negative pressure cavity 61 of the resetting rubber sleeve 6 is easier to deform than other positions, the capacity of the negative pressure cavity 61 is convenient to compress, a negative pressure environment for sucking liquid is generated in the process of capacity change of the negative pressure cavity 61, and the liquid discharge amount is improved.

The fixed cover in the gum cover 6 bottom that resets is equipped with rubber ring 66, rubber ring 66 and the gum cover 6 integrated into one piece that resets, and is located the below of snap ring 25 in the lid 2 and has seted up circular shape slot 24, and rubber ring 66 is pegged graft with slot 24 and is cooperated. The outer side wall of the negative pressure cavity 61 on the resetting rubber sleeve 6 is sleeved with a check ring 65, the check ring 65 is made of plastic materials, and the outer ring wall of the check ring is in clamping fit with the inner wall of the slot 24. Specifically, an organic whole is provided with the bulge loop on the outer lane wall of retaining ring 65, an organic whole is provided with the spacing ring on the slot 24 inner wall, the spacing ring all is the ring form with the bulge loop, back in retaining ring 65 inserted slot 24, bulge loop roof and spacing loop diapire butt, retaining ring 65 diapire and the butt of rubber ring 66 roof, rubber ring 66 diapire and the butt of slot 24 diapire to this carries out spacingly to retaining ring 65 through the spacing loop, and retaining ring 65 is spacing to rubber ring 66, thereby fixed gum cover 6 and the lid 2 that resets. Meanwhile, the retainer ring 65 provides lateral supporting force when the resetting rubber sleeve 6 deforms and protrudes outwards, so that on one hand, the resetting rubber sleeve 6 is prevented from being damaged due to excessive deformation, and on the other hand, the resetting rubber sleeve 6 is prevented from being deviated, so that the volume change amplitude of the negative pressure cavity 61 is reduced, and the liquid output is reduced.

Referring to fig. 4 and 5, a circular groove 23 is formed at the bottom of the cover body 2, a liquid outlet 22 communicated with the straw 15 is formed in the bottom wall of the circular groove 23, a fixing ring 53 made of plastic material is inserted into the circular groove 23, the lower backstop 5 comprises a movable plug 51 arranged in the fixing ring 53, the movable plug 51 is hemispherical, the spherical surface of the movable plug 51 is downward covered on the liquid outlet 22, the movable plug 51 is used for controlling the opening and closing of the liquid outlet 22, and the movable plug 51 in fig. 4 is in a deformation state. An elastic piece 52 is connected between the movable plug 51 and the fixing ring 53, the elastic piece 52 is used for realizing the reset of the movable plug 51, and the elastic piece is an arc-shaped elastic piece made of plastic.

The elastic pieces are distributed at equal angular intervals along the circumferential direction of the movable plug 51, one end of each elastic piece is integrally formed with the movable plug 51, and the other end of each elastic piece extends along the circumferential direction of the movable plug 51 and is fixedly bonded with the inner ring wall of the fixing ring 53. The setting of a plurality of shell fragments can make the atress of activity stopper 51 all directions keep even to reduce the angle deflection of activity stopper 51, avoid activity stopper 51 and liquid outlet 22 to produce the gap and lead to the pump head inefficacy. The non-return rod 42 comprises an adjusting section 44 positioned at the bottom of the non-return rod, the adjusting section 44 is vertically opposite to the movable plug 51, and the adjusting section 44 is abutted to the movable plug 51 when the head cap 3 slides, so that the movable plug 51 is pushed to return to a specified position again, the position deviation caused by long-term use of the movable plug 51 and the fixed ring 53 is avoided, and the effect of one-way drainage is avoided being influenced.

The implementation principle of the pump head structure for the emulsion tank in the embodiment of the application is as follows: when a user presses the head cap 3, the reset rubber sleeve 6 is extruded and deformed, and on one hand, the side wall of the negative pressure cavity 61 protrudes outwards, so that the side wall of the negative pressure cavity 61 is folded, and the capacity of the negative pressure cavity 61 is reduced, and the pressure is increased. On the other hand, the length of the side wall of the liquid discharge hole 64 is shortened, so that a gap is formed between the restrictor ring 43 and the liquid discharge hole 64, air or liquid enters the liquid discharge hole 64 under pressure, the check ring 63 expands, and finally the liquid or air enters the liquid feed passage 31 and is discharged. At this time, the movable plug 51 closes the liquid outlet 22 under the pressure action of the negative pressure cavity 61 and the elastic force of the elastic sheet.

When the user loosens the head cap 3, the reset rubber sleeve 6 resets under the action of the self elastic force, the capacity of the negative pressure cavity 61 is increased, the pressure is reduced, the check ring 63 is closed under the action of the internal and external pressure difference and the self elastic force, and the flow limiting ring 43 is abutted against the edge of the liquid discharge port again, so that the air is prevented from flowing back into the negative pressure cavity 61. Meanwhile, the pressure in the negative pressure cavity 61 is reduced, so that pressure difference is generated on two sides of the movable plug 51, at the moment, the liquid in the bottle overcomes the elastic force of the elastic sheet to push the movable plug 51 to float upwards, and the liquid enters the negative pressure cavity 61 along the gap. Because the liquid impacts along the gap between the check ring 63 and the limit bolt 41 during impact, the direct impact on the check ring 63 is reduced, the check ring 63 is prevented from being damaged, and the service life of the pump head is prolonged.

During installation, a user firstly inserts the fixing ring 53 into the circular groove 23, so that the movable plug 51 covers the liquid outlet 22. Then the reset rubber sleeve 6 is inserted into the slot 24, so that the rubber ring 66 is in inserted fit with the slot 24; then, the retainer ring 65 is sleeved on the reset rubber sleeve 6, and the retainer ring 65 is pressed downwards to enable the convex ring to enter the lower part of the limiting ring, so that the bottom of the reset rubber sleeve 6 is fixed. Then the top end of the non-return rod 42 is inserted into the limit bolt 41 of the head cap 3 for fixing, the head cap 3 is inserted into the top opening of the cover body 2, at this time, the adjusting section 44 of the non-return rod 42 passes through the liquid discharge hole 64 to enter the negative pressure cavity 61, simultaneously, the non-return ring 63 enters the liquid conveying channel 31, and simultaneously, the flange 32 is inserted below the snap ring 25, thus completing the assembly.

The above embodiments are preferred embodiments of the present application, and the protection scope of the present application is not limited by the above embodiments, so: all equivalent changes made according to the structure, shape and principle of the present application shall be covered by the protection scope of the present application.

Claims (8)

1. The utility model provides a pump head structure for emulsion jar, includes lid (2) and slides head cap (3) of being connected with lid (2), its characterized in that: also comprises a lower backstop (5) and a reset rubber sleeve (6) with the bottom connected with the cover body (2), a limit bolt (41) is arranged in the head cap (3), a transfusion channel (31) communicated with the outside is arranged in the limit bolt (41), a non-return ring (63) is arranged at the top end of the reset rubber sleeve (6), the reset rubber sleeve (6) and the non-return ring (63) have elasticity, the non-return ring (63) is sleeved on the limit bolt (41), the transfusion channel (31) is communicated with the negative pressure cavity (61) through a non-return ring (63), the reset rubber sleeve (6) is internally provided with the negative pressure cavity (61) and a drainage port (62) communicated with the negative pressure cavity (61), when the head cap (3) slides, the reset rubber sleeve (6) deforms and the capacity of the negative pressure cavity (61) is reduced, the drainage port (62) is communicated with a suction pipe (15) in the bottle body through a lower backstop (5), and the lower backstop (5) is used for enabling the liquid in the bottle body to enter the negative pressure cavity (61) in a one-way mode.

2. A pumphead structure for an emulsion tank as recited in claim 1, further comprising: a liquid discharge hole (64) used for communicating the negative pressure cavity (61) with the liquid conveying channel (31) is formed in the resetting rubber sleeve (6), a check rod (42) penetrates through the liquid discharge hole (64), the top end of the check rod (42) is connected with the head cap (3), and a flow limiting ring (43) with the outer diameter larger than the opening diameter of the liquid discharge port is fixedly sleeved on the bottom end of the check rod.

3. A pumphead structure for an emulsion tank as recited in claim 1, further comprising: an installation groove (21) is formed in the head cap (3), and the top end of the reset rubber sleeve (6) is in plug-in fit with the installation groove (21).

4. A pumphead structure for an emulsion tank as recited in claim 2, further comprising: convex strips (421) are arranged on the peripheral side wall of the non-return rod (42) along the length direction of the non-return rod, and at least two convex strips (421) are distributed at intervals along the peripheral direction of the non-return rod (42).

5. A pumphead structure for an emulsion tank as recited in claim 1, further comprising: be provided with flange (32) on the outside bottom edge of headgear (3), an organic whole is provided with snap ring (25) on lid (2) open-top inner wall, and snap ring (25) all are the ring form with flange (32), and flange (32) and snap ring (25) butt when headgear (3) is connected back flange (32) with lid (2) and is located snap ring (25) below and headgear (3) slip.

6. A pumphead structure for an emulsion tank as recited in claim 1, further comprising: the bottom of the cover body (2) is provided with a liquid outlet (22) communicated with the suction pipe (15), the lower backstop (5) comprises a movable plug (51) covering the liquid outlet (22), and an elastic part (52) is connected between the movable plug (51) and the cover body (2).

7. A pumphead structure for an emulsion tank as recited in claim 6, further comprising: the elastic piece (52) comprises an elastic sheet fixed with the peripheral side wall of the movable plug (51), and the other end of the elastic sheet extending along the circumferential direction of the movable plug (51) is connected with the cover body (2).

8. A pumphead structure for an emulsion tank as recited in claim 1, further comprising: offer slot (24) in lid (2), the cooperation of pegging graft with slot (24) is overlapped in gum cover (6) bottom that resets, the cover is equipped with retaining ring (65) on the lateral wall that lies in negative pressure chamber (61) on gum cover (6) that resets, retaining ring (65) and slot (24) joint cooperation.

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