CN117899311A - Backflow preventing structure of injection device and injection device - Google Patents

Abstract

The invention relates to a backflow preventing structure of a spraying device and the spraying device. The backflow prevention structure is arranged in the containing cavity of the injection device and separates the containing cavity to form a first flow channel and a second flow channel which are distributed along the liquid injection direction; it comprises the following steps: a body including a channel; a seal forming a seal at least one of the channels; when the spraying device sprays to generate hydraulic force, the sealing element acts under the hydraulic force to open the channel, so that liquid flows along the first flow channel, the channel and the second flow channel in one way in sequence; when the hydraulic force is removed, the seal is reset. The backflow preventing structure is used for opening the channel when the spraying device sprays to generate hydraulic acting force, automatically closing the channel when the spraying device does not spray, preventing external air and/or bacteria from entering the containing cavity, improving the sanitation of stored liquid, and preventing inaccurate liquid metering caused by the fact that air enters the containing cavity when the spraying device absorbs liquid.

Description

Backflow preventing structure of injection device and injection device

Technical Field

The invention relates to the technical field of atomizers, in particular to a backflow preventing structure of a spraying device and the spraying device.

Background

The atomizing spraying device is a structure capable of atomizing and spraying liquid, and when the atomizing spraying device is used for atomizing a medicine, the medicine is sprayed into atomized particles, and the atomized particles directly enter the lower respiratory tract along with the natural breathing of a patient, so that the purposes of diminishing inflammation, eliminating phlegm, relieving asthma and the like are achieved.

The existing atomizing and spraying device has the defects that residual liquid medicine at the nozzle is easy to flow back after spraying is finished or external air is easy to enter the sprayer body from the nozzle, so that bacteria in the atomizing and spraying device grow to pollute the contained liquid, and meanwhile, when the atomizing and spraying device absorbs liquid, the external air is easy to enter a metering chamber to enable liquid medicine to be metered inaccurately.

Disclosure of Invention

Based on the above-mentioned drawbacks of the prior art, it is an object of the present invention to provide a backflow preventing structure of an injection device, which is used to open a channel of the injection device when the injection device generates hydraulic force, close the channel when the injection device does not spray, prevent external air and/or bacteria from entering a cavity, improve the sanitation of stored liquid, and prevent inaccurate liquid metering caused by air entering the cavity when the injection device sucks liquid.

Another object of the present invention is to provide an ejector device that can improve the sealing property of the inside thereof, thereby improving the sanitation of liquid storage and improving the accuracy of liquid metering at the time of liquid suction.

Therefore, the invention provides the following technical scheme.

The invention provides a backflow preventing structure of an injection device, which is used for being arranged in a containing cavity of the injection device and separating the containing cavity to form a first flow channel and a second flow channel which are distributed along the injection direction of liquid; it comprises the following steps:

A body including a channel;

A seal forming a seal at least one of the channels;

Wherein when the spraying device sprays to generate hydraulic force, the sealing piece opens the channel under the hydraulic force so as to enable liquid to flow unidirectionally along the first flow channel, the channel and the second flow channel in sequence; when the hydraulic force is removed, the passage is closed.

Preferably, the seal is movably disposed within the passage, the seal moving position under the hydraulic force to open the passage.

Preferably, the backflow preventing structure further comprises an elastic piece, wherein two ends of the elastic piece are respectively connected with the inner wall surface of the channel and the sealing piece;

the sealing element compresses the elastic element to move the position under the hydraulic acting force, and returns under the elastic acting force of the elastic element after the hydraulic acting force is removed.

Preferably, the channel is provided with a limiting part, and the limiting part is used for limiting when the sealing element is reset.

Preferably, the seal is an elastomer, the seal being an interference fit with the channel.

Preferably, the seal is configured to at least partially elastically deform under the hydraulic force to open the passage.

Preferably, the sealing member is sleeved on the outer peripheral surface of the body and seals the outlet of the channel. Preferably, one end of the sealing member is embedded into the body to be fixedly connected with the body; and/or

The inner wall surface of the sealing element and one of the outer peripheral surfaces of the body form a clamping protrusion, the other one forms a clamping groove, and the sealing element is fixedly connected with the body through the matching of the clamping protrusion and the clamping groove.

Preferably, the sealing member is an end cover structure, and the end cover structure covers the end part of the body.

Preferably, the seal comprises at least two sealing flaps which close to seal the channel and which are openable under the hydraulic force to open the channel.

Preferably, the seal is a seal core having an aperture configured to allow liquid to pass through the seal core under hydraulic force and not allow liquid to flow back through the seal core after the hydraulic force is removed.

Preferably, a flow restrictor is provided in the channel.

The present invention also provides an injection device comprising:

A cavity;

The backflow preventing structure according to any one of the above, wherein the backflow preventing structure is disposed in the cavity.

Preferably, the spraying device further comprises a nozzle and a spraying main body, and the spraying main body and the nozzle enclose to form the containing cavity.

The invention has the following technical effects:

According to the injection device provided by the invention, the backflow preventing structure is arranged, the backflow preventing structure is opened when the injection device injects to generate hydraulic acting force, and the channel is closed when the injection device does not inject, so that liquid and gas do not circulate between the first flow channel and the second flow channel in the injection device, the phenomenon that external air and/or bacteria enter the containing cavity to pollute the contained liquid is avoided, and inaccurate metering caused by the fact that air enters the containing cavity when the injection device absorbs liquid is avoided. By designing the backflow preventing structure into the assembly structure of the body, the sealing element and the elastic element, the switching speed of the backflow preventing structure between the opening state and the closing state is greatly improved. The seal is constructed to at least partially elastically deform under hydraulic force to open the passage, and is simple in structure and easy to assemble.

Drawings

Fig. 1 is a sectional view showing a part of the structure of an ejector in a closed state of a backflow preventing structure in a first embodiment of the present invention;

Fig. 2 is an exploded view showing a part of the structure of the ejector device in the first embodiment of the present invention;

FIG. 3 is a cross-sectional view of an exploded construction of a nozzle and a spray body in a first embodiment of the present invention;

fig. 4 is a structural cross-sectional view of a backflow preventing structure in a second embodiment of the present invention;

fig. 5 is a sectional view showing a part of the structure of the injection device in a closed state of the backflow preventing structure in the second embodiment of the present invention;

Fig. 6 is a sectional view showing a part of the structure of the spraying device in an opened state of the backflow preventing structure in the second embodiment of the present invention;

Fig. 7 is a structural cross-sectional view of a backflow preventing structure in a third embodiment of the present invention;

Fig. 8 is a sectional view showing a part of the structure of the injection device in a closed state of the backflow preventing structure in the third embodiment of the present invention;

Fig. 9 is a structural cross-sectional view of a backflow preventing structure in a fourth embodiment of the present invention;

Fig. 10 is a sectional view showing a part of the structure of the injection device in a closed state of the backflow preventing structure in the fourth embodiment of the present invention;

fig. 11 is a schematic perspective view of a backflow preventing structure in a fifth embodiment of the present invention;

Fig. 12 is a structural cross-sectional view of a backflow preventing structure in a sixth embodiment of the present invention;

fig. 13 is a schematic view showing an assembled structure of a flow restrictor and a backflow preventing structure in a seventh embodiment of the present invention;

Fig. 14 is a schematic perspective view of a part of the structure of the ejector of the present invention.

Description of the reference numerals

1. A nozzle; 11. a boss; 12. a first chamber; 13. a second chamber;

2. a spray body; 21. a groove; 22. a third chamber; 23. a fourth chamber;

3. A backflow preventing structure; 31. a body; 311. a channel; 3111. an outlet; 3112. a limit part; 312. a narrow body portion; 313. a wide body portion; 32. a seal; 33. an elastic member;

4. A backflow preventing structure; 41. a body; 411. a channel; 4111. an outlet; 42. a seal;

5. A backflow preventing structure; 51. a body; 511. a channel; 52. a seal; 521. clamping the bulge;

6. A backflow preventing structure; 61. a body; 611. a channel; 62. a seal; 621. a cover body; 622. a wall body;

7. a backflow preventing structure; 71. a body; 72. a seal; 721. sealing the flaps;

8. A backflow preventing structure; 81. a body; 811. a channel; 82. a seal;

9. A flow restrictor.

Detailed Description

In order to make the technical scheme and the beneficial effects of the application more obvious and understandable, the following detailed description is given by way of example. Unless defined otherwise, technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs.

In the description of the present invention, unless explicitly defined otherwise, terms such as "center", "longitudinal", "lateral", "length", "width", "thickness", "height", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", etc., refer to an orientation or positional relationship based on that shown in the drawings, and are merely for convenience of simplifying the description of the present invention, and do not indicate that the apparatus or element referred to must have a specific orientation, be constructed and operated in a specific orientation, i.e., are not to be construed as limiting the present invention.

In the present invention, the terms "first", "second" are used for descriptive purposes only and are not to be construed as relative importance of the features indicated or the number of technical features indicated. Thus, a feature defining "first", "second" may explicitly include at least one such feature. In the description of the present invention, "plurality" means at least two; "plurality" means at least one; unless otherwise specifically defined.

In the present invention, the terms "mounted," "connected," "secured," "disposed," and the like are to be construed broadly, unless otherwise specifically limited. For example, "connected" may be fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, or can be communicated between two elements or the interaction relationship between the two elements. The specific meaning of the above terms in the present invention can be understood by those of ordinary skill in the art according to the specific circumstances.

In the present invention, unless explicitly defined otherwise, a first feature "on", "above", "over" and "above", "below" or "under" a second feature may be that the first feature and the second feature are in direct contact, or that the first feature and the second feature are in indirect contact via an intermediary. Moreover, a first feature "above," "over" and "on" a second feature may be that the first feature is directly above or obliquely above the second feature, or simply indicates that the level of the first feature is higher than the level of the second feature. The first feature being "under", "below" and "beneath" the second feature may be the first feature being directly under or obliquely below the second feature, or simply indicating that the level of the first feature is less than the level of the second feature.

First embodiment

The following describes in detail the injection device according to the first embodiment of the present invention with reference to fig. 1 to 3 and 14.

In this embodiment, as shown in fig. 1 and 14, the spraying device includes a nozzle 1, a spraying main body 2, and a backflow preventing structure 3, where the nozzle 1 and the spraying main body 2 enclose a cavity; the backflow preventing structure 3 is arranged in the containing cavity and separates the containing cavity to form a first flow passage and a second flow passage which are distributed along the liquid spraying direction.

In the present embodiment, as shown in fig. 1, the backflow preventing structure 3 includes a body 31 and a seal 32, the body 31 including a passage 311, the seal 32 forming a seal in the passage 311. The sealing member 32 cooperates with the body 31, so that when the spraying device is in a non-use state, liquid and gas do not circulate between the first flow channel and the second flow channel, namely, a seal is formed in the containing cavity, so that external air and/or bacteria can be prevented from entering the containing cavity to pollute the contained liquid (for example, liquid medicine), and when the spraying device absorbs liquid, inaccurate metering caused by the air entering the containing cavity is avoided. When the spraying device sprays to generate hydraulic force, the sealing element 32 acts under the hydraulic force to open the channel 311, so that the liquid flows along the first flow channel, the channel 311 and the second flow channel in one way in sequence, and finally mist is sprayed out from the nozzle 1; when the hydraulic force is removed, the seal 32 is reset to again seal the channel 311 in situ, preventing backflow of liquid at the nozzle 1 and preventing external air and/or bacteria from entering the chamber.

As shown in fig. 1 and 3, one end of the injection main body 2 is of an open structure, and the outer circumferential surface of the nozzle 1 is in interference fit with the inner wall of the open structure of the injection main body 2, so that the nozzle 1 is fixedly connected with the injection main body 2. Of course, the end of the jet body 2 may be inserted into the nozzle 1.

Further, the outer circumferential surface of the nozzle 1 is provided with a boss 11, and the inner wall of the open structure is provided with a groove 21, so that the nozzle 1 and the injection main body 2 are stably and fixedly connected through the clamping connection of the boss 11 and the groove 21. Of course, the fixed connection of the nozzle 1 and the spray body 2 may also include a screw connection, a fastener connection, or other connection means.

As shown in fig. 1, the backflow preventing structure 3 is provided in the nozzle 1 to simplify the assembly of the backflow preventing structure 3.

Further, as shown in fig. 1 and 3, the nozzle 1 is provided with a first chamber 12 and a second chamber 13 distributed in the ejection direction, the width of the first chamber 12 being larger than the width of the second chamber 13; the backflow preventing structure 3 comprises a narrow body 312 and a wide body 313, an outlet 3111 of the channel 311 is arranged on the narrow body 312, the outer peripheral surface of the wide body 313 is in interference fit with the cavity wall of the first chamber 12, and the outer wall of the backflow preventing structure 3 and the cavity wall of the second chamber 13 together form a second flow channel so as to ensure that liquid in the first flow channel must enter the second flow channel after passing through the channel of the body 31. Of course, the width of the first chamber 12 may also be equal to or smaller than the width of the second chamber 13, and the structural design of the backflow preventing structure 3 may be matched with the nozzle 1.

Further, as shown in fig. 1 and 3, the ejection body 2 is provided with a third chamber 22, a fourth chamber 23 distributed in the ejection direction, the width of the fourth chamber 23 being larger than the width of the third chamber 22; the nozzle 1 is partially arranged in the fourth chamber 23, and one end of the nozzle 1 is abutted against the bottom wall of the fourth chamber 23 to play a role in positioning during the assembly process of the nozzle 1; the third chamber 22 constitutes a first flow path. Of course, the width of the fourth chamber 23 may also be equal to or smaller than the width of the third chamber 22, as long as the structural design of the nozzle 1 matches that of the ejection body 2.

Further, as shown in fig. 1, one end face of the backflow preventing structure 3 abuts against the cavity wall of the fourth chamber 23, and the other end face of the backflow preventing structure 3 abuts against the cavity wall of the first chamber 12. When the backflow preventing structure 3 is assembled, the backflow preventing structure 3 is placed in the nozzle 1, then the nozzle 1 is assembled with the injection main body 2, the backflow preventing structure 3 can be fixed in the containing cavity, and the backflow preventing structure 3 is simple and quick to assemble.

As shown in fig. 1 and 2, the nozzle 1 is located above the spraying main body 2, the top wall of the nozzle 1 is provided with a plurality of spray holes, and the outlet 3111 of the channel 311 is arranged on the side wall of the body 31, so as to extend the length of the second flow channel, and facilitate uniform spraying. Of course, the outlet 3111 of the channel 311 may also be provided on the top wall of the body 31.

Further, the number of the outlets 3111 may be one, two, three or more, and preferably, the plurality of outlets 3111 are provided at regular intervals in the circumferential direction of the body 31, which is advantageous in improving uniformity of liquid ejection.

In one embodiment, the seal 32 is movably disposed in the channel 311, and the seal 32 moves position under hydraulic force to open the channel 311, and the seal 32 is simple to assemble and has good sealing performance.

Further, in one embodiment, as shown in fig. 1 and 2, the backflow preventing structure 3 further includes an elastic member 33, and both ends of the elastic member 33 are respectively connected to the inner wall surface of the passage 311 and the sealing member 32. When the injection device injects to generate hydraulic force, the sealing element 32 compresses the elastic element 33 under the hydraulic force to move the position, and after the hydraulic force is removed, the compressed elastic element 33 rebounds, the sealing element 32 is restored under the elastic force of the elastic element 33, and the channel is sealed at the position, so that the channel is closed.

By providing the elastic member 33, the inside of the passage 311 can be sealed more stably under the abutting force of the elastic member 33; in addition, the seal 32 can be quickly restored under the rebound force of the elastic member 33, greatly improving the switching rate of the two states of the seal 32.

Further, the elastic member 33 is a spring.

In still another embodiment, the backflow preventing structure 3 may not be provided with the elastic member 33, the sealing member 32 may be maintained at the sealing position by its own weight, and the sealing member 32 may be moved under the hydraulic force to open the passage 311; when the hydraulic force is removed, the seal 32 may return under its own weight.

Further, as shown in fig. 1, the channel 311 is provided with a limiting portion 3112, and the limiting portion 3112 is used for limiting when the sealing member 32 is reset, so as to ensure that the sealing member 32 can be reset to the original position after the hydraulic force is removed, and prevent the sealing member 32 from being misplaced or separated from the channel 311, so as to ensure tightness of the channel 311.

Further, the stopper 3112 is configured as a convex structure protruding from the inner wall surface of the passage 311. It should be understood that the limiting portion 3112 may be configured in other configurations, for example, may be configured as a stepped structure for limiting formed by the inner wall of the channel 311.

In one embodiment, the seal 32 is an elastomer and the seal 32 is an interference fit with the channel 311 to achieve a seal with a simple assembly. Because the seal 32 is resilient, it can deform under external forces to facilitate movement of the seal 32 within the channel 311.

In yet another embodiment, the sealing member 32 may be in clearance fit with the channel 311, and an end surface of the sealing member 32 facing the first flow channel abuts against the limiting portion 3112 to form a seal. The seal 32 can move smoothly in the passage 311 under the hydraulic force, and when the hydraulic force is removed, the seal 32 is restored to be abutted against the stopper 3112.

Further, the sealing member 32 is a silicone member or a rubber member, and has good elasticity and sealing property.

Second embodiment

A spraying device according to a second embodiment of the present invention will be described with reference to fig. 4 to 6.

The injection device of this embodiment is identical to the injection device of the first embodiment in terms of its structural parts, and the differences between the two embodiments will be mainly described below.

In the present embodiment, as shown in fig. 5 and 6, the injection device includes a nozzle 1, an injection main body 2, and a backflow preventing structure 4; the backflow preventing structure 4 includes a body 41 and a seal member 42, and the body 41 includes a passage 411.

In the present embodiment, the structure and the assembly method of the seal member 42 are different from those of the first embodiment. Seal 42 is configured to at least partially elastically deform under hydraulic force to open channel 411. The seal 42 is simple in construction and more labor-saving in opening the passage, which matches the wider range of injection pressures used.

In an embodiment, as shown in fig. 4 to 6, the sealing member 42 is sleeved on the outer peripheral surface of the body 41, and seals the outlet 4111 of the channel 411, so that the channel 411 is closed, and the sealing member 42 is assembled simply, conveniently and without dislocation. It should be appreciated that the seal member 42 may also be a sheet-like structure that abuts against the outer peripheral surface of the body 41 to seal the outlet 4111.

Further, as shown in fig. 4 and 5, one end of the sealing member 42 is embedded into the body 41 to be fixedly connected with the body 41, so that the sealing member 42 is firmly connected with the body 41, and as shown in fig. 6, when the sealing member 42 is elastically deformed under the action of hydraulic pressure, the sealing member 42 can be prevented from being dislocated relative to the body 41, so that the tightness of the sealing member 42 against the outlet 4111 is prevented from being affected.

Third embodiment

A third embodiment of the injection device according to the present invention will be described with reference to fig. 7 to 8.

The configuration of the injection device of the present embodiment is substantially the same as that of the injection device of the second embodiment, and differences between the two embodiments will be mainly described below.

In the present embodiment, as shown in fig. 8, the spraying device includes a nozzle 1, a spraying body 2, and a backflow preventing structure 5; the backflow preventing structure 5 includes a body 51 and a seal 52, and the body 51 includes a passage 511.

In the present embodiment, the connection between the body 51 and the seal 52 is different from the second embodiment. One of the inner wall surface of the seal member 52 and the outer peripheral surface of the body 51 forms a catching protrusion, and the other forms a catching groove, so that the seal member 52 is fixedly connected with the body 51 by the cooperation of the catching protrusion and the catching groove.

Specifically, as shown in fig. 7, the inner wall surface of the seal 52 forms a catching protrusion 521, and the outer peripheral surface of the body 51 forms a catching groove. The clamping protrusion 521 is in interference fit with the clamping groove, so that the firmness and the tightness of the connection between the sealing element 52 and the body 51 are improved, and in addition, the clamping protrusion 521 is conveniently clamped into the clamping groove due to the elasticity of the sealing element 52.

Fourth embodiment

A fourth embodiment of the injection device according to the present invention will be described with reference to fig. 9 to 10.

The configuration of the injection device of the present embodiment is substantially the same as that of the injection device of the second embodiment, and differences between the two embodiments will be mainly described below.

In the present embodiment, as shown in fig. 10, the spraying device includes a nozzle 1, a spraying body 2, and a backflow preventing structure 6; the backflow preventing structure 6 includes a body 61 and a seal 62, and the body 61 includes a passage 611.

In the present embodiment, the connection between the body 61 and the seal 62 is different from the second embodiment. As shown in fig. 9, the sealing member 62 is an end cover structure, the end of the body 61 is covered by the end cover structure, and the sealing member 62 is easy and convenient to assemble.

Further, as shown in fig. 9, the seal 62 includes a cover 621 and a wall 622, the inner surface of the cover 621 abuts against the end face of the body 61, and the wall 622 wraps around the outer peripheral face of one end of the body 61 and seals the outlet of the passage 611. The nozzle 1 is abutted against the outer surface of the cover body, so that the displacement of the sealing member 62 relative to the body 61 is limited, and the dislocation of the sealing member 62 is prevented. When the injection device injects, a hydraulic force is generated, under which the lower end of the wall 622 deforms outwardly in the injection direction, thereby opening the passage 611.

Fifth embodiment

A fifth embodiment of the injection device according to the present invention will be described with reference to fig. 11.

The configuration of the injection device of the present embodiment is substantially the same as that of the injection device of the second embodiment, and differences between the two embodiments will be mainly described below.

In the present embodiment, the spraying device includes a nozzle 1, a spraying body 2, and a backflow preventing structure 7.

In the present embodiment, the structure of the backflow preventing structure 7 is different from that of the second embodiment. As shown in fig. 11, the backflow preventing structure 7 includes a body 71 and a seal 72, the body 71 being provided with a passage; the seal 72 includes at least two sealing flaps 721, the at least two sealing flaps 721 closing to seal the channel, and the at least two sealing flaps 721 being capable of opening to open the channel under hydraulic force. When the hydraulic force is removed, the open sealing flaps 721 return to the original state to seal the channel.

Further, in an embodiment where the body 71 and the seal 72 are two separate components, the seal 72 may be disposed within or at the outlet or at the inlet of the channel.

In still another embodiment, the backflow preventing structure 7 is an integrally formed elastic body structure, so that the overall structure of the backflow preventing structure 7 can be simplified without assembly, and the backflow preventing structure is easy to manufacture. Specifically, the backflow preventing structure 7 is integrally a rubber member or a silicone member, which is provided with a channel, and at least two sealing flaps 721 are configured on the backflow preventing structure 7 by cutting or other processing manners, so as to form an outlet of the channel capable of conducting unidirectionally.

Further, the number of the sealing flaps 721 is three, and the sealing flaps are easy to open under hydraulic force while being good in sealing performance.

Sixth embodiment

An injection device according to a sixth embodiment of the present invention will be described with reference to fig. 12.

The injection device of the present embodiment is substantially the same as the injection device of at least one of the first to fifth embodiments, and the differences will be mainly described below.

In the present embodiment, as shown in fig. 12, the backflow preventing structure 8 includes a body 81 and a seal 82, and the body 81 includes a passage 811. Seal 82 is a seal core, and the aperture of seal 82 is configured to allow liquid to pass through seal 82 under hydraulic force and not allow liquid to flow back through seal 82 when the hydraulic force is removed.

Further, the pore size of the seal 82 is 0.5 μm to 100 μm, preferably 5 μm to 50 μm, more preferably 5 μm to 15 μm, to ensure that the seal 82 has good liquid passage under hydraulic force and good sealing after the hydraulic force is removed, to further prevent reverse ingress of outside air and bacteria.

Further, the seal 82 is made of a polymeric material, preferably a polymeric hydrophobic material, and more preferably ultra high molecular weight polyethylene (UHMWPE, ultra high molecular weight polyethylene). Due to the limitation of the material of the sealing member 82, when a certain liquid pressure difference exists on both sides of the sealing member 82, the liquid can pass through the sealing member 82 and further flow out of the channel 811, and when the hydraulic force is removed, the liquid cannot pass through the inside of the sealing member 82.

Further, in one embodiment, as shown in FIG. 12, a seal 82 is disposed within the channel 811.

In another embodiment, the seal 82 may be provided to cover the outlet of the channel.

In yet another embodiment, the seal 82 may be provided to cover the entrance of the channel.

Further, the sealing member 82 may be secured to the body by, but not limited to, welding or bonding.

Further, the seal 82 may be applied in combination with any of the first to fifth embodiments to improve the sealing of the passage.

Seventh embodiment

An injection device according to a seventh embodiment of the present invention will be described with reference to fig. 13.

The injection device of the present embodiment is substantially the same as at least one of the first to sixth embodiments in structure, and the differences will be mainly described below.

In an embodiment, a flow restrictor 9 is further disposed in the channel of the body to control the flow of the liquid in the channel, thereby ensuring the spraying effect of the nozzle.

Further, as shown in fig. 13, taking the structure of the body 51 in the third embodiment as an example, at least one rib (not shown) is disposed on the inner wall surface of the channel 511 of the body 51, so as to abut against at least one outer surface of the flow-limiting member 9, so that a buffer flow channel is formed between the inner wall surface of the channel 511 and the flow-limiting member 9, and the size of the buffer flow channel is adjusted by the size design of the rib, so as to adjust the flow-limiting effect of the flow-limiting member 9. It will be appreciated that the restriction may also be created by providing a passageway in the restriction 9.

It will be appreciated that the flow restrictor 9 may be used in combination with any of the seals of the first to sixth embodiments to control the flow rate of liquid within the channel.

In any of the above embodiments, the seal is provided only at a certain position of the passage, but the present invention is not limited thereto, and the seal may be provided at a plurality of positions of the passage at the same time, for example, at the inlet and outlet of the passage at the same time, or at the inside and outlet of the passage at the same time. The sealing elements at different positions can be the same sealing element or different sealing elements.

By adopting the technical scheme, the spraying device provided by the invention has at least the following advantages:

(1) In the injection device, the backflow preventing structure comprises the main body and the sealing piece, when the injection device is in a non-use state, liquid and gas do not circulate between the first flow passage and the second flow passage in the injection device, so that the liquid contained in the cavity is prevented from being polluted due to the fact that external air and/or bacteria enter the cavity, and inaccurate metering caused by the fact that air enters the cavity when the injection device absorbs liquid is avoided. When the spraying device sprays to generate hydraulic force, the sealing element acts under the hydraulic force to open the channel of the main body, so that smooth spraying is ensured.

(2) In a preferred scheme, the backflow preventing structure is designed into an assembly structure of the body, the sealing piece and the elastic piece, so that the switching speed of the backflow preventing structure between the opening state and the closing state can be greatly improved.

(3) In a preferred embodiment, the seal is configured to at least partially elastically deform under hydraulic force to open the passage, is simple in construction and easy to assemble.

(4) In a preferred scheme, the backflow prevention structure further comprises a flow limiting piece to control the flow of liquid in the channel, and further the spraying effect of the nozzle is guaranteed.

It should be understood that the above examples are illustrative and are not intended to encompass all possible implementations encompassed by the claims. Various modifications and changes may be made in the above embodiments without departing from the scope of the disclosure. Likewise, the individual features of the above embodiments can also be combined arbitrarily to form further embodiments of the invention which may not be explicitly described. Therefore, the above examples merely represent several embodiments of the present invention and do not limit the scope of protection of the patent of the present invention.

Claims (14)

1. The backflow preventing structure of the spraying device is characterized in that the backflow preventing structure (3, 4, 5, 6, 7, 8) is arranged in a containing cavity of the spraying device and separates the containing cavity to form a first flow channel and a second flow channel which are distributed along the liquid spraying direction; it comprises the following steps:

A body (31, 41, 51, 61, 71, 81) comprising a channel (311, 411, 511, 611, 811);

A seal (32, 42, 52, 62, 72, 82) forming a seal at least one of the channels (311, 411, 511, 611, 811);

Wherein when the spraying device sprays to generate hydraulic force, the sealing element (32, 42, 52, 62, 72, 82) opens the channel (311, 411, 511, 611, 811) under the hydraulic force so as to enable liquid to flow unidirectionally along the first flow channel, the channel and the second flow channel in sequence; when the hydraulic force is removed, the passage is closed.

2. Backflow prevention structure of a spraying device according to claim 1, characterized in that the sealing member (32) is movably arranged in the passage (311), the sealing member (32) moving position under the hydraulic force to open the passage (311).

3. The backflow preventing structure of the injection device according to claim 2, wherein the backflow preventing structure (3) further comprises an elastic member (33), both ends of the elastic member (33) being connected to the inner wall surface of the passage (311) and the sealing member (32), respectively;

Wherein the seal member (32) compresses the elastic member (33) under the hydraulic force to move the position, and returns under the elastic force of the elastic member (33) to close the passage after the hydraulic force is removed.

4. A backflow preventing structure of a spraying device according to claim 3, characterized in that the passage (311) is provided with a stopper (3112), and the stopper (3112) is adapted to be stopped when the seal (32) is reset.

5. The backflow preventing structure of the injection device according to claim 4, wherein the seal (32) is an elastomer, and the seal (32) is interference-fitted with the passage (311).

6. Backflow prevention structure of a spraying device according to claim 1, characterized in that the seal (42, 52, 62, 72) is configured to at least partially elastically deform under the hydraulic force to open the channel (411, 511, 611).

7. The backflow preventing structure of the injection device according to claim 6, wherein the sealing member (42, 52, 62) is fitted around the outer circumferential surface of the body (41, 51, 61) and seals the outlet of the passage (411, 511, 611).

8. The backflow preventing structure of the spraying device according to claim 7, wherein one end of the sealing member (42) is embedded in the body (41) to be fixedly connected with the body (41); and/or

One of the inner wall surface of the sealing member (52) and the outer peripheral surface of the body (51) forms a clamping protrusion (521), and the other forms a clamping groove, so that the sealing member (52) is fixedly connected with the body (51) through the matching of the clamping protrusion (521) and the clamping groove.

9. The backflow preventing structure of the injection device according to claim 7, wherein the seal member (62) is an end cap structure that is provided to cover an end portion of the body (61).

10. The backflow prevention structure of the injection device according to claim 6, wherein the seal (72) includes at least two sealing flaps (721), the sealing flaps (721) being closed to seal the passage, and the at least two sealing flaps (721) being openable to open the passage under the hydraulic force.

11. The backflow prevention structure of the injection device according to claim 1, wherein the seal (82) is a seal core having an aperture configured to allow liquid to pass through the seal core under hydraulic force and not allow liquid to flow back through the seal core after the hydraulic force is removed.

12. Backflow prevention structure of a spraying device according to any of the claims 1-11, characterized in that a flow restrictor (9) is provided in the channel (311, 411, 511, 611, 811).

13. A spray device, the spray device comprising:

A cavity;

Backflow prevention structure according to any one of claims 1-12, said backflow prevention structure (3, 4, 5, 6, 7, 8) being arranged in said cavity.

14. The spraying device according to claim 13, characterized in that it further comprises a nozzle (1) and a spraying body (2), said spraying body (2) enclosing with said nozzle (1) forming said cavity.