阅读说明：本技术 压力平衡的抽液泵 (Pressure-balanced liquid pump ) 是由 张旭辉 林炉强 于 2019-01-30 设计创作，主要内容包括：本发明公开一种压力平衡的抽液泵,包括泵主体、活塞构件、单向进液阀、单向出液阀、进液内管、单向进气密封阀及进液外管,泵主体具有进液口、出液口及活塞口,活塞构件的活塞空间连通活塞口,单向进液阀包括进液塞体及进液弹性件,进液塞体顶抵于进液口,单向出液阀包括出液塞体及出液弹性件,出液塞体顶抵于出液口的外侧,进液内管的进液通道的一端连通于进液口,单向进气密封阀与进液内管之间的气流方向反向于进液通道的进液方向,进液外管的进液部连通进液内管的进液通道的另一端,进气部与进液内管夹合形成进气通道。本发明的压力平衡的抽液泵,在输出液体的过程中,不仅容器的内外压力保持稳定,且每次输出的液体量为稳定的固定值。(The invention discloses a pressure-balanced liquid pump, which comprises a pump main body, a piston member, a one-way liquid inlet valve, a one-way liquid outlet valve, a liquid inlet inner tube, a one-way air inlet sealing valve and a liquid inlet outer tube, wherein the pump main body is provided with a liquid inlet, a liquid outlet and a piston port, the piston space of the piston member is communicated with the piston port, the one-way liquid inlet valve comprises a liquid inlet plug body and a liquid inlet elastic piece, the liquid inlet plug body is propped against the liquid inlet, the one-way liquid outlet valve comprises a liquid outlet plug body and a liquid outlet elastic piece, the liquid outlet plug body is propped against the outer side of the liquid outlet, one end of a liquid inlet channel of the liquid inlet inner tube is communicated with the liquid inlet, the airflow direction between the one-way air inlet sealing valve and the liquid inlet inner tube is opposite to. The liquid pump with balanced pressure not only keeps the internal and external pressure of the container stable, but also ensures that the liquid quantity output each time is a stable fixed value in the process of outputting the liquid.)

1. A pressure balanced pump draw, comprising:

the pump comprises a pump main body, a piston and a pump cover, wherein a main space is arranged in the pump main body, and is provided with a liquid inlet, a liquid outlet and a piston port;

a piston member including a piston cylinder having a piston space communicating with the main space through the piston port, and a piston rod slidably provided in the piston space in an extending direction of the piston cylinder;

the one-way liquid inlet valve comprises a liquid inlet plug body and a liquid inlet elastic piece connected with the liquid inlet plug body, the liquid inlet plug body abuts against the liquid inlet, and the liquid inlet elastic piece abuts against the pump main body;

the one-way liquid outlet valve comprises a liquid outlet plug body and a liquid outlet elastic piece connected with the liquid outlet plug body, the liquid outlet plug body is abutted against the liquid outlet, and the liquid outlet elastic piece is abutted against the pump main body;

the liquid inlet inner pipe is provided with a liquid inlet channel, and one end of the liquid inlet channel is communicated with the liquid inlet;

the one-way air inlet sealing valve is sleeved outside the liquid inlet inner pipe, and the airflow direction between the one-way air inlet sealing valve and the liquid inlet inner pipe is opposite to the liquid inlet direction of the liquid inlet channel; and

the feed liquor outer tube, the feed liquor inner tube and the one-way air inlet seal valve set up in within the feed liquor outer tube, the feed liquor outer tube have into liquid portion and encircle the portion of admitting air of portion of admitting liquid, the portion of admitting liquid intercommunication the other end of the feed liquor passageway of feed liquor inner tube, the portion of admitting air with the feed liquor inner tube presss from both sides and closes and form the inlet channel, the portion of admitting air has air inlet and the gas outlet of intercommunication inlet channel, the one-way air inlet seal valve set up in the air inlet reaches between the gas outlet.

2. The aspiration pump of claim 1, wherein the piston member further comprises a retraction spring disposed between the piston cylinder and the piston pusher.

3. The aspiration pump of claim 1, wherein the plunger rod has at least one snap arm and the plunger cylinder has at least one snap groove, the snap arm slidably snap-fitting into the snap groove.

4. The liquid pump according to claim 1, wherein the liquid inlet elastic member of the one-way liquid inlet valve is arranged to have a compression direction equivalent to a liquid inlet direction of the liquid inlet passage.

5. The aspiration pump of claim 1, wherein the pump body extends from the outlet to form an outlet tube, and the one-way outlet valve is disposed at an end of the outlet tube.

6. The liquid pump according to claim 5, wherein the liquid outlet elastic member of the one-way liquid outlet valve is arranged to have a compression direction equal to the liquid outlet direction of the liquid outlet pipe body.

7. The liquid pump according to claim 1, wherein the pump main body further includes a combined upper cover and a combined lower cover, the combined upper cover and the combined lower cover are clamped to form the main space, the liquid inlet is disposed on the combined upper cover, and the liquid outlet is disposed on the combined lower cover.

8. The aspiration pump of claim 7, wherein the one-way intake valve further comprises a support member disposed between the upper and lower covers, and the intake elastic member of the one-way intake valve is disposed in the support member.

9. The liquid pump according to claim 1, further comprising a container opening sealing plug sleeved outside the liquid inlet portion of the liquid inlet outer tube, wherein the air outlet is communicated between the container opening sealing plug and the liquid inlet portion.

10. The aspiration pump of claim 1, wherein the pump body further comprises at least one pump body retention clip disposed on a side of the pump body.

Technical Field

The present invention relates to an infusion pump, and more particularly, to a pressure balanced infusion pump.

Background

An infusion pump is a device used to move fluids. The common spring pump has a liquid inlet pipe and a liquid outlet pipe communicated with the liquid inlet pipe, and a check valve is arranged between the liquid inlet pipe and the liquid outlet pipe. The liquid in the container is gradually output through the liquid inlet pipe and the liquid outlet pipe by using the piston to compress the space to change the pressure in the space, and the piston is reset by using the spring. The mechanical structure is not easy to damage and can be repeatedly used for a long time.

However, when the fluid is pumped from the container and delivered to another place through the liquid pump, the pressure inside the container is gradually reduced, which makes the pumping more difficult and the amount of the liquid delivered per pumping is unstable. If the container or the flow path is provided with a hole to supplement the pressure inside the container from the outside atmosphere, the liquid may leak from the hole, which may affect the outside environment and may cause damage.

Disclosure of Invention

The invention aims to provide a liquid pump which can keep the pressure balance inside and outside a container, output stable liquid quantity and is safe and leak-proof.

To achieve at least the above objects, the present invention provides a pressure-balanced pump for liquid extraction, comprising: the pump comprises a pump main body, a piston and a pump cover, wherein a main space is arranged in the pump main body, and is provided with a liquid inlet, a liquid outlet and a piston port; the piston component comprises a piston cylinder body and a piston push rod, the piston cylinder body is provided with a piston space communicated with the main space through a piston port, and the piston push rod is arranged in the piston space in a sliding manner along the extending direction of the piston cylinder body; the one-way liquid inlet valve comprises a liquid inlet plug body and a liquid inlet elastic piece connected with the liquid inlet plug body, the liquid inlet plug body is abutted against the liquid inlet, and the liquid inlet elastic piece is abutted against the pump main body; the one-way liquid outlet valve comprises a liquid outlet plug body and a liquid outlet elastic piece connected with the liquid outlet plug body, the liquid outlet plug body is propped against the liquid outlet, and the liquid outlet elastic piece is propped against the pump main body; the liquid inlet inner pipe is provided with a liquid inlet channel, and one end of the liquid inlet channel is communicated with the liquid inlet; the one-way air inlet sealing valve is sleeved outside the liquid inlet inner pipe, and the airflow direction between the one-way air inlet sealing valve and the liquid inlet inner pipe is opposite to the liquid inlet direction of the liquid inlet channel; and the liquid inlet outer pipe is provided with a liquid inlet part and an air inlet part surrounding the liquid inlet part, the liquid inlet part is communicated with the other end of the liquid inlet channel of the liquid inlet inner pipe, the air inlet part and the liquid inlet inner pipe are clamped to form an air inlet channel, the air inlet part is provided with an air inlet and an air outlet which are communicated with the air inlet channel, and the one-way air inlet sealing valve is arranged between the air inlet and the air outlet.

Optionally, the piston member further comprises a pullback spring disposed between the piston cylinder and the piston rod.

Optionally, the piston rod has at least one latch arm, and the piston cylinder has at least one latch groove, and the latch arm is slidably latched in the latch groove.

Optionally, the liquid inlet elastic piece of the one-way liquid inlet valve is set to have a compression direction equal to the liquid inlet direction of the liquid inlet channel.

Optionally, the pump body extends from the liquid outlet to form a liquid outlet pipe body, and the one-way liquid outlet valve is disposed at one end of the liquid outlet pipe body.

Optionally, the liquid outlet elastic member of the one-way liquid outlet valve is set to have a compression direction equal to the liquid outlet direction of the liquid outlet pipe body.

Optionally, the pump body further comprises a combined upper cover and a combined lower cover, the combined upper cover and the combined lower cover are clamped to form a main space, the liquid inlet is formed in the combined upper cover, and the liquid outlet is formed in the combined lower cover.

Optionally, the one-way liquid inlet valve further comprises a supporting piece, the supporting piece is arranged between the combined upper cover and the combined lower cover, and the liquid inlet elastic piece of the one-way liquid inlet valve is arranged in the supporting piece.

Optionally, the liquid inlet device further comprises a container opening sealing plug which is sleeved outside the liquid inlet portion of the liquid inlet outer pipe, and the gas outlet is communicated between the container opening sealing plug and the liquid inlet portion.

Optionally, the pump body further comprises at least one pump body fixing buckle arranged on one side of the pump body.

Therefore, the liquid pump with balanced pressure can continuously and gradually output the liquid in the container through the pump body only by repeatedly pushing and pulling the piston push rod with external force, and the liquid amount output each time is a stable fixed value. In the process of outputting liquid, the internal and external pressures of the container are kept stable, the container is not deformed or broken, and the problem of liquid leakage does not occur in the aspect of safety.

For a better understanding of the nature and technical content of the present invention, reference should be made to the following detailed description of the invention and the accompanying drawings, which are provided for illustration purposes only and are not intended to limit the scope of the invention.

Drawings

FIG. 1 is a schematic diagram of a pressure balanced pump according to a preferred embodiment of the present invention.

Fig. 2 is an exploded view of a pressure balanced pump according to a preferred embodiment of the present invention.

FIG. 3 is a schematic cross-sectional view of a pressure balanced pump according to a preferred embodiment of the present invention.

Fig. 4-6 are schematic diagrams illustrating the operation of a pressure balanced pump according to a preferred embodiment of the present invention.

Reference numerals:

100 pressure balanced pump

1 Pump body

11 main space

12 liquid inlet

13 liquid outlet

14 piston port

15 liquid outlet pipe body

16 combination upper cover

17 combination lower cover

18 pump body fixing fastener

2 piston component

21 piston cylinder

211 piston space

212 snap groove

22 piston push rod

221 Snap arm

23 pullback spring

24 piston sealing ring

3 one-way liquid inlet valve

31 liquid inlet plug

32 liquid inlet elastic element

33 support member

4 one-way liquid outlet valve

41 liquid outlet plug body

42 liquid outlet elastic piece

5 liquid inlet inner pipe

51 liquid inlet channel

6 one-way air inlet seal valve

7 liquid inlet outer pipe

71 liquid inlet part

72 air intake part

721 air inlet

722 air inlet channel

723 air outlet

8 atomizing component

81 atomizing lid

811 opening

82 cover body sealing ring

91 sealing ring

92 container mouth sealing plug

C container

Detailed Description

For a fuller understanding of the present invention, reference should be made to the following detailed description taken in conjunction with the accompanying drawings. The purpose, characteristics and function of the present invention will be understood by those skilled in the art from the disclosure of the present specification. It is to be understood that the invention may be practiced or applied to other embodiments, and that various changes, modifications, and alterations may be made in the details of this description without departing from the spirit thereof. The drawings attached to the present invention are for simplicity and illustrative purposes only, and are not drawn to scale. The following embodiments will further explain the related art of the present invention in detail, but the disclosure is not intended to limit the claims of the present invention. The description is as follows:

as shown in fig. 1 to 3, the liquid pump 100 with pressure balance according to the present invention includes a pump body 1, a piston member 2, a one-way liquid inlet valve 3, a one-way liquid outlet valve 4, a liquid inlet inner tube 5, a one-way air inlet sealing valve 6, and a liquid inlet outer tube 7.

The pump body 1 has a main space 11 therein, and the main space 11 has a liquid inlet 12, a liquid outlet 13, and a piston port 14.

The piston member 2 includes a piston cylinder 21 and a piston rod 22, and the piston cylinder 21 has a piston space 211 communicating with the main space 11 through a piston port 14. The piston push rod 22 is slidably disposed in the piston space 211 in the extending direction of the piston cylinder 21.

The one-way liquid inlet valve 3 is disposed in the main space 11, and the one-way liquid inlet valve 3 includes a liquid inlet plug 31 and a liquid inlet elastic member 32 having one end connected to the liquid inlet plug 31. The liquid inlet plug 31 is pressed against the liquid inlet 12 from the inner side of the main space 11, and the liquid inlet elastic member 32 is pressed against the inside of the pump main body 1. In this embodiment, the liquid inlet plug 31 has a spherical shape, and the liquid inlet elastic member 32 is a spring, but the present invention is not limited thereto.

The one-way liquid outlet valve 4 is arranged outside the main space 11, and the one-way liquid outlet valve 4 comprises a liquid outlet plug body 41 and a liquid outlet elastic member 42 with one end connected to the liquid outlet plug body 41. The liquid outlet plug 41 is pressed against the liquid outlet 13 from the outside of the main space 11, and the liquid outlet elastic member 42 is pressed against the inside of the pump main body 1. In this embodiment, the liquid outlet plug body 41 is spherical, and the liquid outlet elastic member 42 is a spring, however, the invention is not limited thereto.

The liquid inlet inner pipe 5 is provided with a liquid inlet channel 51, and one end of the liquid inlet channel 51 is communicated with the liquid inlet 12.

The one-way air inlet seal valve 6 is sleeved outside the liquid inlet inner pipe 5. In detail, as shown in fig. 3, the one-way inlet seal valve 6 is an annular seal member, which allows the gas/liquid to pass through from a single direction, but prevents the gas/liquid from passing through in the opposite direction. In the present invention, the one-way air intake sealing valve 6 is arranged such that the direction of the air flow between the one-way air intake sealing valve 6 and the liquid inlet inner pipe 5 is opposite to the liquid inlet direction of the liquid inlet channel 51.

The liquid inlet inner pipe 5 and the one-way air inlet sealing valve 6 are arranged in the liquid inlet outer pipe 7. The liquid inlet outer tube 7 has a liquid inlet portion 71 and an air inlet portion 72 surrounding the liquid inlet portion 71. The channel in the liquid inlet portion 71 is communicated with the other end of the liquid inlet channel 51 of the liquid inlet inner pipe 5, and the air inlet portion 72 and the liquid inlet inner pipe 5 are clamped to form an air inlet channel 722. The air inlet portion 72 has an air inlet 721 and an air outlet 723, communicates with the air inlet passage 722, and the one-way air inlet seal valve 6 is provided between the air inlet 721 and the air outlet 723.

Next, how the pressure-balanced liquid-pumping pump 100 of the present invention operates will be described with reference to fig. 4 to 6.

As shown in fig. 4, first, the liquid pump 100 with pressure balance is connected to the container C filled with liquid through the liquid inlet outer tube 7. The liquid flows into the channel in the liquid inlet part 71 and the liquid inlet channel 51 in sequence, and is blocked outside the liquid inlet 12 by the liquid inlet plug body 31. Neither the main space 11 nor the piston space 211 is now filled with liquid. Then, the piston rod 22 is pushed in the direction of the arrow in the drawing by an external force, so that the pressure inside the main space 11 is increased, the liquid inlet plug 31 inside the main space 11 is pushed more tightly, the liquid outlet plug 41 outside the main space 11 is pushed by the air pressure to be separated from the liquid outlet 13, the gas in the main space 11 is discharged from the liquid outlet 13, and the liquid outlet elastic member 42 of the one-way liquid outlet valve 4 is compressed.

Then, as shown in fig. 5, the piston rod 22 is pulled back, and the air pressure in the main space 11 is reduced, so that the liquid outlet plug 41 is restored to be pressed against the liquid outlet 13. When the pressure difference between the liquid pressure in the liquid inlet channel 51 and the main space 11 overcomes the elastic force of the liquid inlet elastic member 32, the liquid inlet plug 31 is pushed away from the liquid inlet 12, and the liquid in the liquid inlet channel 51 flows into the main space 11 through the liquid inlet 12 and flows into the piston space 211 through the piston port 14. At this time, the liquid inlet elastic member 32 of the one-way liquid inlet valve 3 is compressed.

On the other hand, since the liquid in the container C flows into the main space 11 through the liquid inlet channel 51, the external air enters the liquid inlet outer tube 7 through the air inlet 721 formed on the air inlet portion 72 of the liquid inlet outer tube 7, and then is additionally filled into the container C through the air inlet channel 722 and the air outlet 723 formed by the one-way air inlet sealing valve 6, the air inlet portion 72 and the liquid inlet inner tube 5 in a clamping manner, so that the internal and external pressures of the container C are kept stable. In the present embodiment, the gas outlet 723 is opened between the liquid inlet 71 and the gas inlet 72, and the gas is replenished into the container C along a channel between the outer wall of the liquid inlet 71 and the mouth of the container C through the gas outlet 723.

As shown in fig. 6, when the main space 11 and the piston space 211 are filled with liquid and the pressure difference between the inside and the outside of the main space 11 can no longer overcome the elastic force of the liquid inlet elastic member 32, the liquid inlet plug 31 pushes back against the liquid inlet 12 to prevent the liquid from flowing in. At this time, the piston rod 22 is pushed in the direction of the arrow in the drawing by an external force, so that the liquid plug 41 is pushed away from the liquid outlet 13 by the hydraulic pressure, and the liquid is discharged from the liquid outlet 13.

When the pressure of the liquid in the main space 11 can not overcome the elastic force of the liquid outlet elastic member 42, the liquid outlet plug 41 pushes the liquid outlet 13. At this time, the piston rod 22 is pulled back in the opposite direction, so that the main space 11 and the piston space 211 can be replenished with liquid.

As described above, the liquid in the container C can be continuously and gradually discharged through the pump main body 1 by repeatedly pushing and pulling the piston rod 22 with external force. In the process of outputting the liquid, the internal and external pressures of the container C are kept stable, the problem of liquid leakage is avoided, and the amount of the liquid output each time is a stable fixed value.

Further, as shown in fig. 1 to 3, in an embodiment of the present invention, the piston member 2 further includes a pull-back spring 23 disposed between the piston cylinder 21 and the piston rod 22. By means of the elastic force of the pullback spring 23, after the user pushes and presses the piston push rod 22, the stored elastic potential of the pullback spring 23 after being compressed can enable the piston push rod 22 to automatically return to the initial position, and the operation is more automatic and convenient.

Further, as shown in fig. 2 and 3, in an embodiment of the present invention, the piston member 2 further includes a piston sealing ring 24, which is sleeved on the piston rod 22, so that no gap is formed between the piston cylinder 21 and the piston rod 22, and liquid leakage is prevented.

Further, as shown in fig. 1 and 2, in an embodiment of the present invention, the piston rod 22 has at least one latching arm 221, the piston cylinder 21 has at least one latching groove 212, and the latching arm 221 is slidably latched in the latching groove 212 to prevent the piston rod 22 from separating from the piston cylinder 21.

Further, as shown in fig. 5, in one embodiment of the present invention, the liquid inlet elastic member 32 of the one-way liquid inlet valve 3 is arranged to have a compression direction equal to the liquid inlet direction of the liquid inlet passage 51. This makes it easier for the inlet elastic member 32 to be compressed by the air/liquid pressure difference.

Further, as shown in fig. 3, in an embodiment of the present invention, the pump body 1 extends from the liquid outlet 13 to form a liquid outlet tube body 15, and the one-way liquid outlet valve 4 is disposed at one end of the liquid outlet tube body 15. The liquid outlet pipe body 15 can allow the one-way liquid outlet valve 4 to be stably arranged therein. The liquid outlet pipe body 15 can be formed integrally or can be two combined components.

Further, as shown in fig. 4 and fig. 6, in an embodiment of the present invention, the liquid outlet elastic member 42 of the one-way liquid outlet valve 4 is disposed in a compression direction equal to the liquid outlet direction of the liquid outlet pipe body 51. This makes the hydraulic elastic member 42 more easily compressed by the air/hydraulic pressure difference.

Further, as shown in fig. 2 and 3, in an embodiment of the present invention, the liquid outlet pipe further includes an atomizing member 8 disposed at the other end of the liquid outlet pipe 51, and the atomizing member 8 is a block with a pore. Via the atomizing member 8, the liquid can be atomized by being dispersed into fine droplets.

Further, as shown in fig. 1 to 3, in an embodiment of the invention, the liquid dispensing device further includes an atomizing cover 81 and a cover sealing ring 82, the atomizing cover 81 has an opening 811 corresponding to the atomizing member 8, the atomizing cover 81 is disposed outside the liquid outlet pipe 15 and the atomizing member 8 to fix the atomizing member 8, and the cover sealing ring 82 is disposed between the atomizing cover 81 and the liquid outlet pipe 15 to prevent liquid leakage.

Further, as shown in fig. 2 and 3, in an embodiment of the present invention, the pump body 1 further includes a combined upper cover 16 and a combined lower cover 17. The combined upper cover 16 and the combined lower cover 17 are clamped to form a main space 11, the liquid inlet 12 is arranged on the combined upper cover 16, and the liquid outlet 13 is arranged on the combined lower cover 17. During assembly, the pump body 1 may be provided with a larger tank, and the one-way liquid outlet valve 4, the combined lower cover 17, the one-way liquid inlet valve 3 and the combined upper cover 16 are sequentially assembled to form the main space 11. Therefore, the one-way liquid inlet valve 3 and the one-way liquid outlet valve 4 can be embedded in the pump body 1 more easily.

Further, as shown in fig. 2 and 3, in an embodiment of the present invention, the one-way liquid inlet valve 3 further includes a supporting member 33. The supporting member 33 is disposed between the upper cover 16 and the lower cover 17, the elastic liquid inlet member 32 of the one-way liquid inlet valve 3 is disposed in the supporting member 33, and the supporting member 33 can be a pipe with a hole. Thereby, the liquid inlet elastic member 32 is secured in the support member 33, and the upper cover 16 and the lower cover 17 are spaced apart from each other to allow the air/liquid to flow from the piston space 211 into the main space 11 through the piston port 14 and from the main space 11 into the piston space 211 through the piston port 14.

Further, as shown in fig. 2 and 3, in an embodiment of the present invention, a sealing ring 91 is further included, and is sleeved between the liquid inlet inner pipe 5 and the pump body 1. Thereby, the liquid inlet inner pipe 5 and the pump body 1 can be kept tightly connected.

Further, as shown in fig. 2 and fig. 3, in an embodiment of the present invention, a container opening sealing plug 92 is further included, which is sleeved outside the liquid inlet portion 71 of the liquid inlet outer tube 7, and the air outlet 723 is communicated between the container opening sealing plug 92 and the liquid inlet portion 71. In this embodiment, gas is replenished into container C via gas outlet 723 along the path between the outer wall of liquid inlet 71 and container mouth sealing plug 92. The container mouth sealing plug 92 is used as a connecting piece for adapting the container C and the liquid inlet outer pipe 7, and has corresponding different sizes and shapes according to the size and shape of the communicating pipe diameter of the container C. Thereby, the pressure-balanced infusion pump 100 of the present invention can be adapted to a variety of different containers C.

Further, in an embodiment of the present invention, as shown in fig. 1 and 2, the pump body 1 further includes at least one pump body fixing buckle 18 disposed on one side of the pump body 1. The pump body fixing buckle 18 can fix the liquid pump 100 with balanced pressure on other devices, and the operation is more convenient and labor-saving.

While the invention has been disclosed in terms of preferred embodiments, it will be understood by those skilled in the art that the examples are illustrative only and should not be taken as limiting the scope of the invention. It should be noted that all changes and substitutions equivalent to the described embodiments are intended to be included within the scope of the present invention. Therefore, the protection scope of the present invention is defined by the following claims.