One-way valve with limiting device and pressing pump comprising one-way valve

Abstract

A one-way valve comprises a plastic valve bead, a valve seat and a limiting device. The limiting device comprises an elastic part, and one end of the elastic part is provided with a contact part. The limiting device is arranged in the mode that in the first position, the limiting device does not make contact with the plastic valve bead or makes contact with the plastic valve bead but does not exert acting force on the plastic valve bead, and when the plastic valve bead moves from the closed first position to the opened second position under the action of the acting force of the product, the plastic valve bead is matched with the contact part. And when the acting force is removed, the plastic valve bead is pressed to a third position under the elastic force action of the elastic part, and the third position is located between the first position and the second position and is close to the first position. The one-way valve is used for the pressing pump and can be closed in time after a product stops flowing, and therefore the problems that the pressing pump is large in air compression frequency, small in pump output and the like are solved. The invention further relates to the pressing pump comprising the limiting device.

Description

Technical Field

[0001] The present application belongs to the field of product dispensing devices, and in particular relates to a press pump for dispensing liquid or semi-liquid products from a container, and in particular to the design of a one-way valve in the press pump. Background Art

[0002] A press pump is usually installed on the packaging container of daily chemical products such as shampoo and shower gel. By pressing the press pump, the liquid or semi-liquid product in the container is pumped out for consumers to use. In the press pump, an elastic reset mechanism is provided to restore the press pump to its original position after pumping the product once for the next pumping. In the process of the press pump returning to its original position, the internal volume of the cylinder of the press pump increases, causing the pressure inside the cylinder to drop, and a pressure difference is generated with the pressure of the product in the container. Under the action of the pressure difference, the one-way valve arranged on the passage between the container and the inside of the cylinder in the press pump opens, thereby allowing the product in the container to flow into the cylinder for the next pumping.

[0003] During the application of the compression pump, it was found that for some products with high viscosity due to special formula, the compression pump with existing structure will show some problems during use. One of the problems is that when pumping products with high viscosity, the pumping volume of the product often becomes smaller, and the number of air pressure is also relatively high, and sometimes even no material is discharged. These problems are particularly obvious for all-plastic pumps with plastic elastic reset mechanisms.

[0004] The applicant has found through research that one of the reasons for the above problems is that the valve components of the one-way valve are usually of low density. Specifically, for environmental protection and cost-saving considerations, the valve components of the one-way valve are usually in the form of plastic valve beads. The density of the plastic valve bead is relatively small compared to products with higher viscosity. Therefore, after the one-way valve is opened to allow the viscous product to enter the cylinder, the plastic valve bead returns to the valve seat slowly under the action of the buoyancy of the product, and may even float in the viscous product or adhere to the side wall of the product channel. This causes the valve components of the one-way valve to fall back lagging or even not falling back, which causes the compression pump to fail to work properly thereafter.

[0005] Therefore, in the field of compression pumps, there is a need for further improving the structure of compression pumps to overcome at least one of the above-mentioned technical problems. Summary of the invention

[0006] This application is made to solve the problems existing in the above-mentioned prior art. The purpose of this application is to provide a one-way valve for a press pump with an improved structure, which can ensure that the one-way valve is closed in time, especially when pumping products with high viscosity, thereby solving the problem of frequent air compression and reduced pumping volume.

[0007] A one-way valve, the one-way valve comprises a valve member and a valve seat, the valve member is a plastic valve ball, the plastic valve ball can move between a first position matched with the valve seat and a second position away from the valve seat, in the first position, the plastic valve ball matches with the valve seat, so that the one-way valve is closed, in the second position, the plastic valve ball leaves the valve seat, so that the one-way valve is opened. The one-way valve comprises a limiting device, the limiting device comprises an elastic part, one end of the elastic part is provided with a contact part, wherein the limiting device is arranged so that in the first position, the limiting device does not contact with the plastic valve ball, or contacts with the plastic valve ball but does not apply an action force to the plastic valve ball, when the plastic valve ball moves from the first position to the second position under the action of the product, the plastic valve ball matches with the contact part, thereby causing the elastic part to be compressed and deformed, when the action force is removed, the plastic valve ball is pressed down to a third position under the action of the elastic force of the elastic part, and the third position is between the first position and the second position and close to the first position.

[0008] For such a one-way valve structure, when used for the first time, the one-way valve opens under the action of product pressure, and the valve member moves upward and contacts the limit device, causing the elastic part of the limit device to be deformed under pressure. At this time, the limit device can limit the distance that the plastic valve bead floats under the action of a product with a relatively high viscosity. When the product stops flowing, the elastic force of the elastic part presses the plastic valve bead down and returns it to a position near the valve seat. When used next time, the limit device can quickly return the plastic valve bead to a position that matches the valve seat. In this way, it helps to close the one-way valve in time, thereby solving the problem of a large number of air compressions and a reduced pumping volume in subsequent operations caused by the untimely closure of the one-way valve. This effect of the one-way valve is particularly useful for a press pump that uses a plastic spring as an elastic reset mechanism.

[0009] Optionally, the limiting device further comprises a base, and the other end of the elastic part is connected to the base. The limiting device can be fixed in the pressing pump through the base, for example, fixed on the position of the cylinder of the pressing pump.

[0010] In a specific structure, the elastic part includes at least one elastic strip. Preferably, it may include at least three elastic strips. Alternatively, the elastic part may also adopt other elastically deformable structures, such as a spiral shape.

[0011] Preferably, the contact portion is formed as a claw, and at least three claws are arranged on the side of the claw facing the plastic valve ball. When the plastic valve ball abuts against the contact portion in the form of the claw, a hollow product channel is formed between the plastic valve ball and the claw, and such a structure can reduce the resistance when the product flows through.

[0012] The present application also relates to a press pump, which includes a pressure head, a toothed sleeve and a cylinder, wherein the toothed sleeve and the cylinder are fixedly connected, a piston rod is connected to the lower part of the pressure head, a piston is provided on one end of the piston rod and extends into the cylinder, and the piston is sealed with the inner wall of the cylinder. The press pump also includes a one-way valve as described above. The one-way valve may be at least one of an upper one-way valve and a lower one-way valve of the press pump.

[0013] In one exemplary configuration, a valve seat of the one-way valve is formed on an inner wall of the cylinder.

[0014] Alternatively, the pressing pump also includes an elastic reset mechanism, one end of which is directly or indirectly supported by the pressure head, the other end of which is fixedly connected to the lower part of the cylinder, and the valve seat of the one-way valve is formed on the inner surface of the other end of the elastic reset mechanism.

[0015] In an exemplary structure, the limiting device is mounted on or integrally formed with the inner wall of the cylinder.

[0016] Preferably, the one-way valve further comprises a radial limiting structure, which is formed on the inner surface of one of the elastic reset mechanism, the piston rod and the cylinder and is located above the valve seat, and is configured to limit the radial position of the plastic valve ball. The radial limiting structure helps guide the plastic valve ball to move up and down, and the plastic valve ball will not deviate too much from the central axis of the pressing pump.

[0017] In a specific structure, the radial limiting structure includes at least three radial limiting ribs. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] The accompanying drawings show non-limiting preferred implementation structures of the present invention, and the features and advantages of the present invention can be more clearly seen in conjunction with the accompanying drawings.

[0019] Figure 1 A cross-sectional view of the compression pump of the present application is shown, wherein the compression pump is in its lower locking state.

[0020] Figure 2 Shows Figure 1 A partial enlarged view of part A in FIG. 1 , which is the part of the pressing pump including the one-way valve.

[0021] Figure 3a to 3c The front view, cross-sectional view and stereoscopic view of the limit device of the one-way valve are respectively shown.

[0022] Figure 4 It is a cross-sectional view schematically showing the matching state between the limit device and the valve member of the one-way valve.

[0023] Figure 5A partial cross-sectional view of a portion of a one-way valve is shown that shows another embodiment of a pressing pump of the present application, wherein radial limiting ribs are shown.

[0024] (Explanation of symbols)

[0025] 1 pump

[0026] 10 pressure head

[0027] 20 braces

[0028] 30 cylinders

[0029] 40 piston rod

[0030] 41 Piston

[0031] 42 flange

[0032] 50 Check valve

[0033] 51 valve parts

[0034] 52 valve seat

[0035] 53 radial limit rib

[0036] 60 elastic reset mechanism

[0037] 70 limit device

[0038] 71 base

[0039] 72 Elastic part

[0040] 73 claws

[0041] 74 claws DETAILED DESCRIPTION

[0042] The specific implementation of the present invention will be described in detail below in conjunction with the accompanying drawings. It should be understood that the drawings only show preferred embodiments of the present invention, which do not constitute a limitation on the scope of the present invention. Those skilled in the art can make various obvious modifications, variations, and equivalent substitutions to the present invention based on the embodiments shown in the drawings, and the technical features of the different embodiments described below can be arbitrarily combined with each other without contradiction, which all fall within the scope of protection of the present invention.

[0043] Figure 1 The cross-sectional view of the pressing pump 1 is shown. The pressing pump 1 includes a pressing head 10, a toothed sleeve 20 and a cylinder 30. The toothed sleeve 20 is fixedly connected to the cylinder 30. A piston rod 40 is connected to the lower part of the pressing head 10, and a piston 41 is provided on one end of the piston rod 40 and extends into the cylinder 30. The piston 41 is sealed with the inner wall of the cylinder 30 and can reciprocate up and down in the cylinder 30 as the pressing head 10 and the piston rod 40 move in the up and down directions.

[0044] The pressing pump 1 further comprises a one-way valve 50, for example Figure 1 In the embodiment, the one-way valve 50 is a lower one-way valve disposed below the piston 41, and the one-way valve 50 is located in the product passage from the container into the cylinder 30. Figure 2 As shown in FIG. 1 , the one-way valve 50 comprises a valve member 51 and a valve seat 52, wherein the valve member 51 is specifically in the form of a plastic valve bead. When the valve member 51 is fitted in the valve seat 52, that is, in the Figure 2 In the state shown, the one-way valve 50 is closed. When the valve member 51 moves and breaks away from the contact with the valve seat 52, the one-way valve 50 is opened.

[0045] Back to Figure 1 The pressing pump 1 can also optionally include an elastic reset mechanism 60, one end of which (e.g., the upper end in the figure) is directly or indirectly supported on the pressure head 10, and the other end of which (e.g., the lower end in the figure) is fixedly connected to the lower part of the cylinder 30. For example, in the exemplary structure shown in the figure, a flange portion 42 is provided on the piston rod 40 connected to the lower part of the pressure head 10, and the upper end of the elastic reset mechanism 60 is supported on the flange portion 42, thereby indirectly supporting the pressure head 10 via the flange portion 42 and the piston rod 40. Of course, the elastic reset mechanism 60 can also be directly supported on the pressure head 10.

[0046] As shown in the figure, the valve seat 52 of the one-way valve 50 is formed on the inner surface of one end of the elastic reset mechanism 60 fixedly connected to the cylinder 30. Of course, the valve seat 52 can also be arranged on other fixed parts of the pressing pump 1, for example, it can be formed on the inner surface of the lower end of the cylinder 30.

[0047] When the pressure head 10 is pressed downward, the piston rod 40 and the piston 41 thereon will move downward together. In this process, the space for accommodating the product in the cylinder 30 is reduced, so that the pressure of the product in the cylinder 30 increases. Under the action of this pressure, the product in the cylinder 30 will be pumped to the pressure head 10, and then distributed to the outside from the pressure head 10. In addition, under the action of the product pressure in the cylinder 30, the valve member 51 of the one-way valve 50 remains fitted on the valve seat 52, so that the one-way valve 50 is closed, preventing the product in the container from entering the cylinder 30 through the one-way valve 50. When the pressure head 10 moves upward together with the piston rod 40 and the piston 41 thereon, the space for accommodating the product in the cylinder 30 increases, so that the pressure in the space decreases. When the pressure in the space for accommodating the product in the cylinder 30 decreases to less than the pressure in the container, the valve member 51 is separated from the valve seat 52 under the action of the pressure difference between the inside of the container and the inside of the cylinder 30, so that the one-way valve 50 opens. At this time, the product in the container is allowed to flow into the cylinder 30 through the product passage to prepare for the next product dispensing.

[0048] Furthermore, in the case where an elastic reset mechanism 60 is provided, when the pressure head 10 is pressed, the elastic reset mechanism 60 is deformed and accumulates elastic force. When the pressing force applied to the pressure head 10 is removed, the elastic force of the elastic reset mechanism 60 will cause the pressure head 10 to move upward with the piston rod 40 and the piston 41 thereon and return to its upper standby position.

[0049] In the present application, the one-way valve 50 in the pressing pump 1 further includes a limiting device 70, which is located above the valve member 51 of the one-way valve 50. When the one-way valve 50 is opened, the valve member 51 will move upward with the flow of the product and can contact the limiting device 70. When the valve member 51 contacts the limiting device 70, the limiting device 70 can limit the stroke of the valve member 51 moving upward.

[0050] Figure 3a to 3c The structure of the limiting device 70 in the present application is shown. The limiting device 70 has an optional base 71, and the elastic portion 72 extends from the base 71, and is connected to a contact portion such as a claw 73 at one end thereof away from the base 71. In the preferred structure shown in the figure, the limiting device 70 is arranged at the lower part of the cylinder 30, for example, it is integrally formed at the lower part of the cylinder 30. Alternatively, the limiting device 70 can also be arranged at other positions, for example, at the lower end of the elastic reset mechanism 60 fixedly connected to the cylinder 30.

[0051] In addition, preferably, the elastic portion 72 includes three elastic strips, and the claw 73 includes at least three claw heads 74. Of course, other numbers of elastic strips and claw heads 74 may be provided as required, which is also within the scope of the present application.

[0052] Furthermore, the installation position of the limit device 70 in the pressing pump 1 is arranged so that, before the pressure head 10 is pressed for the first time to pump the product, the valve member 51 is engaged in the valve seat 52, that is, the valve member 51 is in its closed position (or the first position), at which time the limit device 70, specifically the contact portion (claw 73) of the limit device does not contact the valve member 51, or although it contacts the valve member 51, it does not apply any force to the valve member 51.

[0053] After the product is pumped for the first time, the valve member 51 will leave the valve seat 52 and move upward as the product flows or under the pressure of the product, and then the valve member 51 will abut against the claw head 74 and compress the elastic portion 72 upward, causing the elastic portion 72 to be deformed under pressure. In this process, the valve member 51 is subjected to the upward buoyancy of the product and the downward elastic force of the deformed elastic portion 72, and these two forces will be equal in size and balanced with each other. At this time, the valve member 51, which is specifically a plastic valve ball, reaches its equilibrium position under the action of buoyancy and elastic force and can remain stationary. Therefore, the limit device 70 serves to limit the upward movement of the valve member 51, so that the valve member 51 will not leave the valve seat 52 too far. In other words, after the product is pumped for the first time, although the valve member 51 will move upward away from the valve seat 52 under the action of the buoyancy of the product, the limiting device 70 can limit the floating valve member 51 to a position (or a third position) between the position where the one-way valve 50 is closed (or the first position) and the position where the one-way valve 50 is fully opened (or the second position), and the third position is located near the valve seat 52, or closer to the first position than the second position.

[0054] When the consumer presses the pressure head 10 again to pump the product, the limiting device 70 keeps the valve member 51 at a position (third position) near the position (i.e., the first position) in cooperation with the valve seat 52, so the valve member 51 can quickly return to the position in cooperation with the valve seat 52 under the action of the limiting device 70. In other words, during the closing process of the one-way valve 50, the limiting device 70 helps the valve member 51 to return to its closed position in cooperation with the valve seat 52 more quickly, which can reduce the number of air compressions in subsequent operations and avoid a reduction in the pumping volume.

[0055] In summary, by providing the limit device 70 with the elastic part 72 of the present application, when the pressure head 10 is pressed down to pump the product, the valve member 51 can quickly return to the position where it cooperates with the valve seat 52 to close the valve. When the pressure head 10 moves upward after pumping, the product pushes the valve member 51 upward. Under the superposition of the thrust and buoyancy of the product, the valve member 51 compresses the elastic part 72 of the limit device 70 and moves the limit device 70 away from the valve seat 52, which can reduce the resistance to the flow of the product. When the product stops flowing, the elastic force of the elastic part 72 of the limit device 70 will press the valve member 51 downward until its elastic force is balanced with the buoyancy of the product, so that the valve member 51 remains in a position close to the valve seat 52, waiting for the next pumping.

[0056] In the above structure, the claw head 74 of the limit device 70 is a preferred structure. When the valve member 51 in the form of a valve ball moves upward and contacts the claw head 74, a hollow channel is formed between the valve member 51 and the claw head 74 to facilitate the passage of the product and reduce the resistance during the product flow.

[0057] Further, in Figure 5 , a partial cross-sectional view of the one-way valve 50 of another embodiment of the pressing pump 1 is shown. The one-way valve 50 further includes a plurality of radial limiting ribs 53, for example, three radial limiting ribs 53. The radial limiting ribs 53 are arranged on the inner surface of the lower end of the elastic reset mechanism 60 fixedly connected to the cylinder 30, and are located above the valve seat 52, and are used to limit the radial position of the valve member 51, so that the valve member 51 will not deviate excessively from the central axis of the cylinder 30 when moving in the up and down directions. This helps to ensure that the limiting device 70 can act on the valve member 51 and can effectively press the valve member 51 against the valve seat 52.

[0058] The above describes in detail the preferred structure of the pressing pump 1 and the one-way valve 50 therein. Those skilled in the art can make further modifications and variations based on the disclosed structure, and these modifications and variations are also within the scope of the present application.

[0059] For example, the base 71 of the limiting device 70 is an optional structure, and the upper end of the elastic portion 72 may be directly fixedly connected or integrally formed on one of the cylinder 30 and the elastic reset mechanism 60 .

[0060] In addition to the form of three or more elastic strips shown in the figure, the elastic portion 72 of the limiting device 70 can also be other structures, such as a coil spring.

[0061] In addition to the lower one-way valve shown in the figure, the pressing pump 1 may also include an upper one-way valve. The upper one-way valve may also adopt the structure of the one-way valve 50 described above, and in particular, may also include a limit device 70.

[0062] For example, in Figure 5 In the structure shown, the radial limiting ribs 53 are formed on the inner surface of the elastic reset mechanism 60. In other embodiments, the radial limiting ribs 53 can also be formed on the inner surfaces of the cylinder 30 and the piston rod 40.

Claims

1. A one-way valve, comprising a valve member and a valve seat, wherein the valve member is a plastic valve ball, and the plastic valve ball can move between a first position cooperating with the valve seat and a second position leaving the valve seat, wherein in the first position, the plastic valve ball cooperates with the valve seat, thereby the one-way valve is closed, and in the second position, the plastic valve ball leaves the valve seat, thereby the one-way valve is opened, It is characterized in that The one-way valve also includes a limit device, which includes an elastic part, and a contact part is provided at one end of the elastic part, wherein the limit device is configured so that, in the first position, the limit device does not contact the plastic valve bead, or contacts the plastic valve bead but does not apply a force to the plastic valve bead; when the plastic valve bead moves from the first position toward the second position under the action of the product, the plastic valve bead cooperates with the contact part, thereby causing the elastic part to be compressed and deformed; when the action force is removed, the plastic valve bead is pressed down to a third position under the action of the elastic force of the elastic part, wherein the third position is located between the first position and the second position, and close to the first position.

2. The one-way valve according to claim 1, characterized in that: The limiting device also includes a base, and the other end of the elastic part is connected to the base.

3. The one-way valve according to claim 1, characterized in that: The elastic portion includes at least one elastic strip.

4. The one-way valve according to claim 1, characterized in that: The contact portion is formed as a claw, and at least three claw heads are arranged on a side of the claw facing the plastic valve ball.

5. A pressing pump, comprising a pressure head, a toothed sleeve and a cylinder, wherein the toothed sleeve and the cylinder are fixedly connected, a piston rod is connected to the lower part of the pressure head, a piston is provided on one end of the piston rod and extends into the cylinder, and the piston is sealed with the inner wall of the cylinder. It is characterized in that The pressing pump further comprises a one-way valve according to any one of claims 1 to 4.

6. The pressing pump according to claim 5, characterized in that: The valve seat of the one-way valve is formed on an inner wall of the cylinder.

7. The pressing pump according to claim 5, characterized in that: The pressing pump further comprises an elastic reset mechanism, one end of which is directly or indirectly supported by the pressure head, and the other end of which is fixedly connected to the lower part of the cylinder; Wherein, the valve seat of the one-way valve is formed on the inner surface of the other end of the elastic reset mechanism.

8. The pressing pump according to claim 5, characterized in that: The limiting device is installed on or integrally formed on the inner wall of the cylinder.

9. The pressing pump according to claim 7, characterized in that: The one-way valve also includes a radial limiting structure, which is formed on the inner surface of the elastic reset mechanism, the piston rod and one of the cylinders and is located above the valve seat. The radial limiting structure is configured to limit the radial position of the plastic valve ball.

10. The pressing pump according to claim 9, characterized in that: The radial limiting structure includes at least three radial limiting ribs.

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