CN211253606U - Emulsion pump with enhanced suction - Google Patents

Abstract

An emulsion pump comprising: a ram having a ram tip for discharging feed liquid; the tooth socket is used for closing the bottle mouth; the cylinder is internally provided with a one-way valve; the piston assembly reciprocates in the cylinder, is connected to the pressure head and comprises a piston and a piston rod, the piston is slidably sleeved on the piston rod, the piston is in contact fit with the inner wall of the cylinder, and a sealing structure is arranged between the piston rod and the piston; and the return spring is used for returning the piston assembly, wherein the sealing structure comprises a first sealing surface on the piston rod and a second sealing surface on the piston, and the first sealing surface and the second sealing surface are arranged on the side surfaces of the piston rod and the piston. The utility model discloses a latex pump has adopted novel side seal between piston rod and piston, so strengthened the suction of whole latex pump to avoid the pneumatics or go out the not enough problem of liquid.

Description

Emulsion pump with enhanced suction

Technical Field

The utility model relates to a lotion pump that the daily use chemical field used, more specifically relates to a lotion pump with reinforcing suction.

Background

In order to facilitate use, a lotion pump (or a pressing pump) is used in a plurality of daily chemical products. The user only needs to press the pressure head of emulsion pump can come out the feed liquid ration pump sending in the bottle, very convenient and fast. Such emulsion pumps need to have good suction. If the suction force of the emulsion pump is not good, the time of using the emulsion pump is increased. In this case, the user may not pump the liquid even after pressing several times, or the amount of the liquid may be insufficient even if the liquid is pumped. Such operational problems may cause a bad user experience.

In particular, there is a type of lotion pump in which a piston assembly includes a piston rod and a piston, and the piston rod is manufactured separately from the piston and then assembled together. In the emulsion pump, the piston rod can be divided into two parts of the connecting conduit and the piston head, or can be a single-piece piston rod which integrates the two parts of the connecting conduit and the piston head into a whole. In the case of a single-piece piston rod, a slider (or called slide core) structure is required during molding through a mold, so that a parting line (or called flash) is left on the piston rod. Parting lines left on the piston rod can affect the sealing fit of the piston rod to the piston. If the sealing fit between the piston rod and the piston is not good, the problem of weak suction force of the emulsion pump can be caused.

SUMMERY OF THE UTILITY MODEL

In order to overcome the above disadvantages, an object of the present invention is to provide a lotion pump with enhanced suction, which can avoid the shortage of suction caused by the sealing defects between the piston and the piston rod.

In order to achieve the above object, the utility model provides a lotion pump, include: a ram having a ram tip for discharging feed liquid; the tooth socket is used for closing the bottle mouth; the cylinder is internally provided with a one-way valve; the piston assembly reciprocates in the cylinder, is connected to the pressure head and comprises a piston and a piston rod, the piston is slidably sleeved on the piston rod, the piston is in contact fit with the inner wall of the cylinder, and a sealing structure is arranged between the piston rod and the piston; and the reset spring is used for resetting the piston assembly, and is characterized in that the sealing structure comprises a first sealing surface on the piston rod and a second sealing surface on the piston, and the first sealing surface and the second sealing surface are arranged on the side surfaces of the piston rod and the piston.

Preferably, a constriction is provided between the head and the shaft of the piston rod, on which constriction the piston is axially movable relative to one another.

Preferably, the first sealing surface is arranged on the outer side of the piston rod head, and the second sealing surface is arranged on the inner side of the lower part of the piston inner ring.

Preferably, the first sealing surface and said second sealing surface are perpendicular surfaces.

Preferably, at least one of the first sealing surface and the second sealing surface is provided as a chamfer.

Preferably, a down stop for the piston is provided on the piston rod and the piston.

Preferably, a protrusion is provided on the inner ring of the piston, a flange is provided at the head of the piston rod, and the protrusion and the flange form a downward stopper structure of the piston.

Preferably, the cylinder further comprises a spring seat disposed in the cylinder for supporting the return spring.

Preferably, the spring seat forms an upward stop for the piston.

The utility model discloses a lotion pump has adopted novel side seal between piston rod and piston, has overcome in the traditional lotion pump because use the slider shaping to form the overlap and the sealed defect that causes between the terminal surface of piston rod and piston. Thereby, a good seal can be formed between the piston and the piston rod. Further, because the sealing between the piston and the piston rod is improved, the suction force of the whole emulsion pump is enhanced, and the problem of insufficient air pressure or liquid outlet is avoided.

Drawings

FIG. 1 is a cross-sectional view of a lotion pump according to a preferred embodiment of the present invention, wherein the piston assembly of the pump is in a rebound condition;

FIG. 2 is another cross-sectional view of the lotion pump of FIG. 1, with the lotion pump in a depressed state;

FIG. 3 is a cross-sectional view of a piston and piston rod combination used in the lotion pump of FIG. 1, wherein a first sealing surface on the piston rod is in contact with and seals against a second sealing surface on the piston;

FIG. 4 is a cross-sectional view of a piston and piston rod combination used in the lotion pump of FIG. 1, with a first sealing surface on the piston rod spaced from a second sealing surface on the piston;

FIG. 5a is a cross-sectional view of a piston rod used in the lotion pump of FIG. 1;

FIG. 5b is a front view of a piston rod used in the lotion pump of FIG. 1;

FIG. 6a is a cross-sectional view of a piston used in the lotion pump of FIG. 1;

FIG. 6b is a front view of a piston used in the lotion pump of FIG. 1;

FIG. 7a is a cross-sectional view of a prior art emulsion pump wherein the piston and piston rod employ a conventional seal arrangement;

FIG. 7b is a cross-sectional view of the piston rod of the lotion pump of FIG. 7 a; and

FIG. 7c is a cross-sectional view of the piston assembly of the lotion pump of FIG. 7a having a piston rod and piston combination.

Detailed Description

The state of the art is described in detail below in connection with fig. 7a, 7b and 7 c.

Fig. 7a shows a prior art lotion pump 100. Fig. 7b shows the piston rod in the lotion pump, and fig. 7c shows the piston assembly formed by the combination of the piston rod and the piston.

Specifically, as shown in fig. 7b, a slider shaped segment 1010, having a length designated H, is provided adjacent the head of the plunger rod 101. As the name implies, a "slide molding section" is a section molded with a slide in an injection molding machine.

As shown in fig. 7c, the piston 102 is slidably fitted around the head of the piston rod 101, thereby forming a piston assembly. As can be seen, a sealing structure a may be formed between the piston 102 and the piston rod 101. The seal structure a is formed between the lower end surface of the inner ring of the piston 102 and the upper end surface of the lower stopper on the piston rod 101. The lower stop on the plunger rod 101 is formed at the end of the slider forming section 1010. due to the inherent drawbacks of the forming process, flash (or parting line) is easily formed on the plunger rod when the slider is used for forming. The flash caused by the sliding block can form a barrier when the piston 102 is in sealing contact with the piston rod 101, so that the sealing effect is obviously reduced, and the suction force of the emulsion pump is further reduced.

In order to overcome the problems, the utility model discloses seal structure between foretell piston and piston rod has improved, and then provides a lotion pump with reinforcing suction.

A lotion pump according to a preferred embodiment of the present invention will be described with reference to FIGS. 1 to 6a and 6 b. Like reference numerals in the drawings denote like parts.

Referring to fig. 1 and 2, a lotion pump according to a preferred embodiment of the present invention is shown and generally designated by the numeral 1. As shown in the figure, the emulsion pump 1 comprises a pressure head 2, a tooth socket 3, a cylinder 4, a piston assembly 5, a spring seat 6, a gasket 7, a return spring 8, a one-way valve 9, a suction pipe 10 and the like. It should be understood that emulsion pump 1 may include other components than those described above, or may omit some of the components described above. These will be referred to hereinafter.

The basic working principle of pumping feed liquid by using the emulsion pump 1 is similar to that of the prior art. In short, when the pressure head 2 is pressed down, the feed liquid in the emulsion pump 1 is pumped out. When the pressure head 2 moves upwards due to the action of the return spring 8, the liquid in the bottle is sucked into the pump cavity through the suction pipe 10.

The head 2 is configured to expel the feed liquid from the mouthpiece outlet upon depression by a user. The ram 2 is connected to a piston assembly 5.

The tooth socket 3 is used for closing the bottle mouth. In particular, the mouthpiece 3 engages the mouth of the bottle by means of a coupling structure (in this embodiment an internal thread, but also non-helical reliefs or other coupling structures such as coupling teeth) and ensures sealing with the mouth of the bottle by means of a gasket 7 provided at the top of the mouthpiece.

The inner wall of the cylinder 4 is in contact engagement with the piston 52. A check valve 9 is provided in the cylinder 4. A return spring 8 is also provided within the cylinder 4 and acts on the piston assembly 5. A suction pipe 10 is provided at a lower end portion of the cylinder 4 and communicated with the bottom of the bottle body (not shown). The cylinder 4 is closed by a mouthpiece 3. It will be appreciated that a cylinder head separate from the mouthpiece 3 may be provided to close the cylinder.

The piston assembly 5 is configured to reciprocate within the cylinder 4. The piston assembly 5 is connected to the ram 2 so as to move downwardly when the ram 2 is depressed, and moves upwardly under the action of the return spring 8. It will be appreciated that a connecting conduit may additionally be provided for connecting the ram 2 and the piston assembly 5.

A spring seat 6 is preferably provided in the cylinder 4 for supporting a return spring 8. It should be understood that the spring seat 6 may also be integrally provided on the cylinder 4.

The piston assembly 5 includes a piston rod 51 and a piston 52. The piston 52 is slidably fitted over the piston rod 51. When the piston rod 51 is forced to move in the cylinder 4, the piston 52 can move up and down relative to the piston rod 51. Upon upward movement, piston 52 may engage in contact with spring seat 6, thereby preventing further upward movement of piston 52. It will be appreciated that a stop may also be provided on the inner wall of the cylinder 4 to prevent further upward travel of the piston 52. Upon downward movement, the piston 52 may engage in contact with a stop on the piston rod 51, thereby preventing further downward movement of the piston 52.

Specifically, in this embodiment, the outer ring of the piston 52 forms an upward-travel stop structure with the spring seat 6, and the projection 522 on the inner ring of the piston 52 forms a downward-travel stop structure with the flange 512 of the head portion of the piston rod 51.

Importantly, a novel seal 50 (fig. 3) can be formed between the piston rod 51 and the piston 52. The sealing structure 50 includes a first sealing surface 511 on the piston rod 51 and a second sealing surface 521 on the piston 52. The first sealing surface 511 is arranged on the outer side of the piston rod head, while the second sealing surface 521 is arranged on the inner side of the lower part of the piston inner ring. In this embodiment, the first and second sealing surfaces 511, 521 are substantially perpendicular surfaces, but it should be understood that at least one of the first and second sealing surfaces 511, 521 may be provided as an inclined surface. In some cases, the sealing effect of the sealing surface provided as a bevel may be better.

As shown in fig. 5b, a neck 510 is provided between the head and the shaft of the piston rod 51, the neck 510 corresponding to a slider molding section of the prior art, as indicated by the length H. In addition, the height (or length) dimension H1 of the first sealing surface 511 is also labeled in fig. 5 b. The piston 52 is axially movable relative to the neck 510 of the piston rod 51.

Since the first sealing surface 511 and the second sealing surface 521 are provided on the side surfaces of the piston rod 51 and the piston 52, a sealing defect caused between the end surfaces of the piston rod 51 and the piston 52 by forming flash using slider molding in the prior art is avoided.

As shown in fig. 1, the sealing structure 50 is effective when the piston assembly 5 of the lotion pump rebounds upward, so that the passage between the piston 52 and the piston rod 51 is in a closed state until reaching the top dead center position. A good seal is formed between the piston 52 and the piston rod 51 due to the novel side seal. Because the sealing between the piston 52 and the piston rod 51 is improved, the suction force of the whole emulsion pump 1 is enhanced, thereby avoiding the problem of insufficient air pressure or liquid outlet.

The related assembly and operation of the lotion pump according to the preferred embodiment of the present invention will be described below.

In the case of the seal structure 50 of the present invention, when the piston rod 51 and the piston 52 are assembled together, the protrusion 522 of the piston 52 needs to pass over the head of the piston rod 51 and enter the constricted portion 510 of the piston rod 51 by means of the elasticity of the members.

When the user presses the pressing head 2 of the lotion pump 1 downwards, the pressing head 2 drives the piston rod 51 to move downwards. The piston 52 slides upward relative to the piston rod 51 due to the frictional force acting on the piston 52 by the inner wall of the cylinder 4. The liquid can then enter from the cylinder 4, enter into the cavity of the piston rod (also called pump cavity) through the gap between the piston 52 and the piston rod 51, and then be pumped out through the pressure nozzle of the pressure head 2.

When the user removes the pressing force on the pressure head 2, the piston assembly 5 of the emulsion pump 1 rebounds and resets upwards under the action of the return spring 8. At this time, the piston rod 51 and the piston 52 move upward by the spring force. During the upward movement, the piston 52 slides downward relative to the piston rod 51. A seal is formed between the piston 52 and the piston rod 51 by means of a sealing structure 50. At this point, the feed liquid is drawn from the bottle through the open lower one-way valve into the cylinder 4 for the next press.

While the lotion pump of the present invention has been described in connection with the preferred embodiment thereof, it will be understood that equivalent alterations and modifications will occur to those skilled in the art based on the foregoing disclosure, and for example, the upward stop structure of the piston 52 need not be the spring seat 6, but may be replaced by a stop structure formed on the cylinder 4 or an additional cylinder head. Additionally, the check valve within the cylinder may take various forms. Furthermore, the piston assembly 5 may be indirectly connected to the ram 2 via a further connecting conduit. Accordingly, the scope of the present invention should not be limited by the foregoing description, but should be defined by the appended claims.

Reference numerals:

1: emulsion pump

2: pressure head

3: tooth socket

4: cylinder

5: piston assembly

50: sealing structure

51: piston rod

510: necking down part

511: first sealing surface

512: flange

52: piston

521: second sealing surface

522: protrusion

6: spring seat

7: gasket

8: reset spring

9: one-way valve

10: suction tube

100: emulsion pump

101: piston rod

1010: slider forming section

102: a piston.

Claims (7)

1. An emulsion pump comprising: a ram having a ram tip for discharging feed liquid; the tooth socket is used for closing a bottle opening; the cylinder is internally provided with a one-way valve; the piston assembly reciprocates in the cylinder, is connected to the pressure head and comprises a piston and a piston rod, the piston is slidably sleeved on the piston rod, the piston is in contact fit with the inner wall of the cylinder, and a sealing structure is arranged between the piston rod and the piston; and a return spring for returning the piston assembly, wherein a neck part is arranged between the head part and the rod part of the piston rod, and the piston makes axial relative motion on the neck part of the piston rod.

2. The emulsion pump of claim 1, wherein the first sealing surface and the second sealing surface are perpendicular surfaces.

3. The emulsion pump of claim 1, wherein at least one of the first sealing surface and the second sealing surface is provided as a ramped surface.

4. The emulsion pump of claim 1, wherein a downstroke stop for the piston is provided on the piston rod and the piston.

5. The emulsion pump of claim 4, wherein a protrusion is provided on the inner race of the piston, and a flange is provided on the head of the piston rod, the protrusion and flange forming a downstroke stop for the piston.

6. The emulsion pump of claim 1, further comprising a spring seat disposed within the cylinder for supporting the return spring.

7. The emulsion pump of claim 6, wherein the spring seat forms an upward stop for the piston.

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