JP2013078393A - Air mixing injector - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a novel air mixing injector which can take out even a small amount of content liquids in a state that the liquids are mixed with air.SOLUTION: The novel air mixing injector comprises: a piston shaft 3 which has a first piston 2 for pressure-feeding air in a first syringe and pushes out the air; an elastic member 5 supported toward a cylinder 1c inside the first syringe 1; a check valve 6 which has a valve body 6 for closing an internal passage r1 by a biasing force of the elastic member 5, forms a filling space S1 of the air pushed out by the first piston 2 together with the valve body 6a between the first syringe 1 and itself, and has a pressure-receiving face for opening the valve body 6a while withstanding the biasing force of the elastic member 5 by receiving a rise of the internal pressure of the filling space S1; and a second syringe 7 which has a second piston 8 movable by the air pushed out by the opening of the valve body 6a as an biasing force, and has an air passage r2 therein which mixes air for imparting the biasing force to the second piston 8 into the content liquids in a filling space S2 which is formed between the second piston 8 and itself.

Description

  The present invention relates to an air mixing type ejector capable of ejecting a content liquid obtained by pushing a piston into a syringe and mixing air to the outside.

  As a conventional air mixing type ejector, a spray nozzle is attached to the tip of a syringe so that when the piston is pushed in, the content liquid can be sprayed by mixing the air with the content liquid of the syringe. (For example, refer to Patent Document 1).

JP 2001-137344 A

  However, the conventional air mixing type ejector fills a syringe as an operation instrument with the content liquid, and mists the content liquid pushed out by the piston in the syringe through a spray nozzle attached to the tip of the syringe. Is. For this reason, if the syringe is downsized for the purpose of spraying a small amount, the usability deteriorates, so that it is not suitable for spraying a small amount of the content liquid.

  An object of the present invention is to provide a novel air mixing type ejector that can take out a small amount of content liquid in a mixed state with air.

  The air mixing type ejector of the present invention has a piston shaft that has a first piston that pumps air in a first syringe and pushes out the air, and a valve body that is closed by an urging force of an elastic member, together with the valve body A pressure receiving surface is provided between the first syringe and the first syringe so as to form a space filled with the air pushed out by the first piston and open the valve body against the urging force of the elastic member in response to an increase in the internal pressure of the filling space. And a second piston that is movable between the non-return valve and the air pushed out by opening the valve body as an urging force. The air flow path for mixing the air that gives the urging force is provided with a second syringe formed inside.

  If an air flow path distribute | circulates the air extruded by opening a non-return valve to the filling space of the content liquid formed between the said 2nd piston and the 2nd syringe through the 2nd piston. Good. For this reason, the air flow path can be formed entirely or locally in the axial direction. Similarly, even if it is formed all around the axis, it can be formed at one place in the circumferential direction or at a plurality of places at intervals in the circumferential direction. As an air flow path, it can be set as the groove part formed in the internal peripheral surface of a 2nd syringe, for example.

  The second piston and the second syringe can be detachably provided to the first syringe. Moreover, in this invention, a 2nd syringe can also be provided so that it cannot be removed with respect to a 1st syringe.

  In the present invention, when the piston is pushed in and the first piston in the first syringe is operated, the first piston fills the air in the first syringe between the first syringe and the check valve. By pushing into the space, the internal pressure of the filling space can be increased. When the check valve opens as the internal pressure increases, compressed air is pushed out to the second syringe. Thereby, while being able to move the 2nd piston in the said 2nd syringe, this compressed air is the filling space formed between the 2nd piston and the 2nd syringe through the air flow path formed in the 2nd syringe. Can be mixed with the content liquid. Therefore, according to the present invention, the content liquid mixed with air can be taken out in a volume corresponding to the second syringe by a simple operation of simply pushing the piston shaft.

  In addition, since the second piston is operated by the air pushed out by the first piston, the second syringe and the second piston can be adopted as a mechanism for filling and pumping the content liquid. As a mechanism to drive, a 1st syringe and a 1st piston are employable. In this case, only the mechanism for filling and pumping the content liquid, that is, only the second syringe and the second piston can be reduced without downsizing the mechanism for driving the second piston. Therefore, the present invention is effective when it is desired to take out only a small amount of the content liquid mixed with air without impairing operability.

It is an exploded view which shows the state which decomposed | disassembled the cartridge type spray syringe which is the 1st form of this invention into the cartridge and the operating instrument in a partial cross section. FIG. 2 is a plan view, a rear view, and a perspective view, respectively, of the fixing member according to the embodiment. In the check valve according to the embodiment, (a) to (d) are a plan view, a rear view, a side view and a perspective view, respectively, shown in partial cross section. It is a partially expanded sectional view of FIG. It is an expanded sectional view which shows the state immediately after operating the 2nd piston by spraying the piston shaft which concerns on the same form, and spraying the content liquid. It is an expanded sectional view showing the state where the 2nd piston is operated by pushing in the piston shaft concerning the form, and the contents liquid is sprayed. (a) is a perspective view which shows the 2nd piston which concerns on the form with an O-ring, (b) is the O-ring of the state pushed in in the 2nd syringe, when assembling a 2nd piston to a 2nd syringe It is a perspective view which shows the state of this with a 1st piston. It is a figure which shows the state which is spraying the content liquid by pushing in the piston shaft which concerns on the same form in a partial cross section. It is a figure which shows the state which removed the cartridge after using the same form and pulled back the piston shaft in a partial cross section. It is a 1st piston which concerns on the same form, Comprising: (a), (b) is the top view, respectively, and XX sectional drawing of (a). The piston shaft according to the embodiment, wherein (a) is a view showing the piston shaft in a partial cross section, (b) is a view taken along arrow D of (a), and (c) is a YY cross section. It is a figure and (d) is a figure which shows the modification of the same piston shaft in the YY cross section of (a). It is a partially expanded sectional view of FIG. It is a figure which shows the cartridge type spray syringe which is the 2nd form of this invention in a partial cross section. It is a figure which shows the integral spray injector which is the 3rd form of this invention in a partial cross section.

  Hereinafter, with reference to drawings, various forms of an air mixing type ejector which is the present invention are explained in detail.

  FIG. 1 shows a cartridge-type spray injector I1 used for spraying nasal drops, which is a first embodiment of the present invention, in a state where it is disassembled into a cartridge A and an operation instrument B.

  Reference numeral 1 denotes a first syringe. The first syringe 1 is integrally provided with a cylindrical body portion 1c having a diameter smaller than that of the body portion 1a via an annular shoulder portion 1b formed at one end of the hollow body portion 1a. An internal passage r1 that leads to a space formed inside the trunk portion 1a is formed inside the cylindrical body portion 1c. Further, the first syringe 1 is provided with a finger hook 1d.

  Reference numeral 2 denotes a first piston. The first piston 2 is slidably held inside the body portion 1 a of the first syringe 1, thereby pumping the air in the first syringe 1. Reference numeral 3 denotes a piston shaft. The first piston 2 is fixed to the piston shaft 3. Thereby, the 1st piston 2 can push out the air in the 1st syringe 1 to the internal channel | path r1 of the cylinder part 1c by pressing the flange 3f provided in the piston shaft 3. FIG.

  Reference numeral 4 denotes a fixing member fixed in the first syringe 1. The fixing member 4 has a partition wall 4a that bisects the inside of the body portion 1a. As shown in FIG. 2, a peripheral wall 4c stands up together with the shaft portion 4b on the partition wall 4a. In addition, four through holes 4d (indicated by way of example only in one place in the figure) are formed in the partition wall 4a inside the peripheral wall 4c. As a means for fixing the fixing member 4 in the first syringe 1, for example, an annular protrusion 4e is formed on the outer periphery of the fixing member 4, and the annular protrusion 4e is formed on the first syringe 1 as shown in FIG. Some are fitted into an annular recess n formed on the inner peripheral surface.

  Furthermore, as shown in FIG. 4, the fixing member 4 supports the elastic member 5 toward the cylindrical portion 1c between the shaft portion 4b and the peripheral wall 4c. The elastic member 5 is an elastic member that can be deformed and restored, and includes, for example, a spring as illustrated.

  Reference numeral 6 denotes a check valve that causes the air pushed out by the first piston 2 to be compressed air and communicates with the internal passage r1 of the cylindrical portion 1c. The check valve 6 has a valve body 6a that opens and closes the internal passage r1, and the valve body 6a is integrally provided with an outer cylinder portion 6c via an annular wall 6b. Thereby, the check valve 6 is slidably held inside the body portion 1 a of the first syringe 1.

  The check valve 6 has a cylindrical portion 6d that hangs down from the annular wall 6b. The elastic member 5 elastically supports the check valve 6 with respect to the fixed member 4 by being arranged inside the cylindrical portion 6d. Further, as shown in FIG. 3, the check valve 6 is formed with four through holes 6 e (indicated by way of example only in one place in the drawing). As shown in FIG. 4, the cylindrical portion 6d is slidably held inside the peripheral wall 4c, thereby forming a passage for guiding air from the through hole 4d to the through hole 6e.

  In addition, the check valve 6 forms a filling space S1 of air pushed out by the first piston 2 between the valve body 6a and the first syringe 1, and receives the internal pressure of the filling space S1. f is provided. As shown in FIG. 4, the check valve 6 normally closes the internal passage r <b> 1 by the urging force of the elastic member 5 (FIG. 3A shows a seal portion 6 f that is sealed by the valve body 6 a). As a result, the air pushed into the filling space S1 loses the escape space and is compressed. Further, when the internal pressure of the filling space S1 rises due to the air guided through the through hole 6e, the internal pressure rises and the valve body 6a is opened against the urging force of the elastic member 5 as shown in FIG. be able to. Thereby, high compressed air can be sent out via the check valve 6.

  The operation instrument B is configured as described above, while the cartridge A is configured as follows.

  The code | symbol 7 is a 2nd syringe with which a content liquid is filled. The second syringe 7 has a flange portion 7 a that is fixed to the first syringe 1. The first syringe 1 is provided with a distal outer cylinder 1e that surrounds the cylindrical portion 1c. The flange portion 7a functions as a screw portion, and is detachably screwed with a screw portion 1s formed inside the distal end outer cylinder 1e. Thereby, the 2nd syringe 7 can be made to mount | wear with the cartridge A with respect to the operating tool B like illustration by screwing together with the 1st syringe 1. FIG.

  Reference numeral 8 denotes a second piston slidably disposed in the second syringe 7. As shown in FIG. 7, the second piston 8 has an annular recess 8a that circulates around the axis O8. The annular recess 8a partitions the body portion of the second piston 8 into an upper body portion 8b and a lower body portion 8c. An annular seal member 9 such as an O-ring is retained in the annular recess 8a.

  As shown in FIG. 1, the second piston 8 forms a space (filling space) S <b> 2 for filling the content liquid with the second syringe 7. The filling space S2 is in an initial state in which the piston shaft 3 is not pushed in, or in an initial stage in which the piston shaft 3 is pushed in, and in a state in which the internal passage r1 is closed by the check valve 6 (initial pushing stage). As shown in FIG. 4, the sealing member 9 is sealed from the inner passage r1 by sealing between the inner peripheral surface of the second syringe 7. For this reason, when the valve body 6a is opened by the further pushing of the piston shaft 3 as shown in FIG. 5, the second piston 8 uses the compressed air pushed out through the internal passage r1 as a biasing force to be described later. It moves toward the exit 7c (see FIG. 8).

  Here, the lower body portion 8 c of the second piston 8 has an outer diameter dimension set smaller than an inner diameter dimension of the second syringe 7. For this reason, the lower body 8 c of the second piston 8 forms an annular gap C 1 with respect to the inner peripheral surface of the second syringe 7.

  Further, an air flow path r2 is formed inside the second syringe 7. The air flow path r2 circulates the compressed air pushed out by opening the check valve 6. The compressed air is pumped from the internal passage r1 through the air flow path r2 to the content liquid filling space S2. For this reason, the air flow path r2 has a reduced diameter (inclined) with respect to the inner peripheral surface of the second syringe 7 as a whole, for example, the inner peripheral surface of the second syringe 7 shown in FIG. It may be formed so as to include a portion to be formed, or may be formed at a local position in the whole along the axis O direction. Similarly, even if it is formed all around the axis O, it can be formed at one place in the circumferential direction or at a plurality of places at intervals in the circumferential direction. In this embodiment, a plurality of grooves 7b extending along the axis O are formed as the air flow path r2.

  As shown in FIG. 4, the gap between the gap C1 and the groove portion 7b is initially blocked by the seal member 9 as shown in FIG. 4. When the valve body 6a is opened as shown in FIG. It moves toward the spout 7c by the compressed air from r1. When the seal member 9 is positioned on the groove 7b by this movement, as shown in the figure, the compressed air pushed out from the first piston 2 through the internal passage r1 is pushed out from the gap C1 into the filling space S2 through the groove 7b. As a result, it is mixed with the content liquid in the filling space S2. As a result, the content liquid filled in the filling space S2 is mixed with the compressed air that gives the urging force to the second piston 8, and is jetted out in a mist from the jet port 7c toward the outside. Can do.

  When the movement of the second piston 8 is larger, when the lower body portion 8c passes the groove portion 7b as shown in FIG. 6, the compressed air pushed out from the first piston 2 through the internal passage r1 is It is extruded directly into the filling space S2 through only the groove 7b.

  Further, the second piston 8 is prevented from coming off from the second syringe 7 by an annular member 10 fixed inside the second syringe 7. Further, as shown in FIG. 7, the second piston 8 has a longitudinal groove 8d formed in the annular recess 8a, and the step surface 8e of the lower body portion 8c has an axis O8 at the position of the longitudinal groove 8d. A concave shape is formed along the direction toward the pressure receiving surface 8 f of the second piston 8. In this case, when the second piston 8 is assembled to the second syringe 7, the sealing member 9 slides with the second syringe 7 from the state shown by the two-dot chain line in FIG. Even if it is rolled as shown by the two-dot chain line, after assembling, the vertical groove 8d serves as an underpass by returning to the state shown by the two-dot chain line in FIG. Thus, air can be introduced from the gap C1.

  In this invention, if the piston shaft 3 is pushed in and the 1st piston 2 in the 1st syringe 1 is operated, the said 1st piston 2 will change the air in the 1st syringe 1 into the 2nd syringe 7, and the check valve 6. The internal pressure of the filling space S1 can be increased by pushing it out into the filling space S1 formed between the two. When the check valve 6 is opened as the internal pressure increases, the compressed air is pushed out to the second syringe 7 through the internal passage r1. The compressed air moves the second piston 8 in the second syringe 7 and is pushed out into a filling space S2 formed between the second piston 8 through an air flow path r2 formed in the second syringe 7. . As a result, as shown in FIG. 8, the content liquid filled in the filling space S2 is mixed with the compressed air from the check valve 6, and at a stretch from the jet outlet 7c toward the outside. Can be spouted. Therefore, according to the present invention, the content liquid mixed with air can be taken out in a volume corresponding to the second syringe 7 by a simple operation of simply pushing the piston shaft 3.

  In addition, since the second piston 8 is operated by the air pushed out by the first piston 2, the second syringe 7 and the second piston 8 can be adopted as a mechanism for filling and pumping the content liquid. As a mechanism for driving the second piston 8, the first syringe 1 and the first piston 2 can be employed. In this case, only the mechanism for filling and pumping the content liquid, that is, only the second syringe 7 and the second piston 8 can be reduced without downsizing the mechanism for driving the second piston 8. Therefore, the present invention is effective when it is desired to take out only a small amount of the content liquid mixed with air without impairing operability.

  Therefore, according to the present invention, it is possible to provide a novel air mixing type ejector that can take out a small amount of content liquid in a mixed state with air.

  Moreover, in this embodiment, as shown in FIG. 1, the second syringe 7 is provided with a sealing plug 11. The sealing plug 11 is connected via a severable connecting portion 11a. As a result, the filling space S2 is completely sealed. And the sealing stopper 11 forms the jet nozzle 7c in the front-end | tip of the 2nd syringe 7 by isolate | separating from the 2nd syringe 7 as shown in FIG. Note that the sealing plug is not a “drilling plug” as in this embodiment, and can be replaced with a cap or the like.

  By the way, in this embodiment, as shown in FIG. 9, the used cartridge A can be removed from the operation instrument B and replaced with a new cartridge A.

  However, after the piston shaft 3 is pushed in and the compressed air from the filling space S1 is pumped, the pressure in the filling space S1 decreases. close up. For this reason, as shown by the arrow in FIG. 9, even if the piston shaft 3 is to be pulled back, it is difficult to pull back the piston shaft 3 due to the negative pressure generated in the first syringe 1.

  Therefore, in this embodiment, the first piston 2 and the piston shaft 3 constitute an outside air introduction valve.

  The first piston 2 has a hollow sliding portion 2a that is slidably held inside the first syringe 1, and a valve body 2b is formed in an opening 2h formed inside the sliding portion 2a. Has been placed. As shown in FIG. 10, the valve body 2b is provided integrally with the sliding portion 2a via a connecting piece 2c. The connecting piece 2c can be deformed and restored, and contributes to the opening and closing of the valve body 2b. In addition, according to this invention, the valve body 2b is not limited to a 1-point valve like this form, For example, it can also be set as the 3-point valve which provided the connection piece 2c in three places.

  As shown in FIG. 11, the piston shaft 3 has a shaft portion 3a having a cross-sectional shape. A first flange 3b is integrally provided at one end of the shaft portion 3a. The outer diameter of the first flange 3 b is set smaller than the inner diameter of the first syringe 1. For this reason, the 1st flange 3b forms the cyclic | annular clearance gap C2 with respect to the internal peripheral surface of the 1st syringe 1, as shown in FIG.

  Further, the first flange 3b is integrally provided with a second flange 3d via a connecting portion 3c having a cross-sectional shape. The first piston 2 is fixed to the second flange 3d as a tip portion of the piston shaft 3. The first piston 2 has an annular protrusion 2d formed inside the sliding portion 2a. Thus, the first piston 2 is fixed around the second flange 3d by hooking the annular protrusion 2d to the outer peripheral edge of the second flange 3d.

  Moreover, the annular convex part 3e stands up integrally with the 2nd flange 3d. A through hole 3h is formed inside the annular convex portion 3e. Thereby, the through-hole 3h is divided into four through-holes by the connecting portion 3c (see FIG. 11B; only one place is indicated in the drawing as an example). The annular protrusion 3e functions as a valve seat on which the valve body 2b is seated, so that the through hole 3h is held in a sealed state.

  According to this configuration, when the piston shaft 3 is pushed in, the valve body 2b of the first piston 2 sits on the piston shaft 3 and seals the inside of the first syringe 1 as shown in FIG. Thereby, the air in the first syringe 1 can be pushed out by the first piston 2.

  On the other hand, when the piston shaft 3 is pulled back, the valve body 2b of the first piston 2 is separated from the annular convex portion 3e of the piston shaft 3 by the negative pressure generated in the first syringe 1, as shown in FIG. To do. Thereby, since air from the outside is introduced into the first syringe 1 through the through hole 3h from the gap C2 between the first syringe 1 and the first flange 3b, the piston shaft 3 can be pulled back smoothly. It can be carried out. According to the present invention, as shown in FIG. 11 (d), the gap C2 is enlarged by forming the recess 3d1 on the outer edge of the second flange 3d, or the gap C2 is formed only by the recess 3d1. I can do it.

  Further, in this embodiment, the annular convex portion 3e raised from the second flange 3d is made to function as a valve seat, thereby improving the sealing performance with the valve body 2b. By omitting the protrusion 3e, the surface of the second flange 3d itself can function as a valve seat.

  FIG. 13 shows a cartridge type spray syringe I2 according to the second embodiment of the present invention. Although the 1st form mentioned above is constituted as an exchangeable cartridge type by screwing the 2nd syringe 7 with respect to the 1st syringe 1, in this form, the tip outer cylinder 1e is a screw part. Instead of 1s, it is configured as an annular recess 1n that goes around the axis O. The flange portion 7a of the first syringe 1 is detachably fitted into the annular recess 1n. Thereby, the cartridge A can be exchanged for the operating tool B. In the present embodiment, the same parts as those of the first embodiment are denoted by the same reference numerals and the description thereof is omitted.

  FIG. 14 shows an integrated spray injector I3 according to the third embodiment of the present invention, in which the second syringe 7 cannot be removed from the first syringe 1.

  In this embodiment, the flange portion 7a of the first syringe 1 is retained by being fitted into the annular recess 1n. In this case, since the syringe I3 is used up, it is not necessary to form an outside air introduction valve with the first piston 2 and the piston shaft 3 as in the first embodiment. Further, since the second syringe 7 cannot be removed, the annular member 10 for preventing the second piston 8 from coming off can be omitted.

  The above description only shows one embodiment of the present invention, and various modifications can be made within the scope of the claims. For example, according to the present invention, the content liquid can be ejected in the form of a mist or foam, but by providing a mesh or a sintered body at the spout 7c, the content liquid in which air is mixed, Further, it can be ejected in the form of bubbles. Furthermore, according to this invention, the component of each form can be diverted between each form.

  The present invention can be applied to various devices as long as it is an ejector intended to eject the content liquid mixed with air. Also, the type of contents is not limited.

DESCRIPTION OF SYMBOLS 1 1st syringe 1a trunk | drum 1b shoulder part 1c cylinder part 1d finger hook part 1e tip outer cylinder 1n annular recessed part 1s screw part 2 1st piston 2a sliding part 2b valve body 2c connection piece 2h opening part 3 piston shaft 3a shaft part 3b 1st flange 3c connection part 3d 2nd flange 3e annular convex part 3h through-hole 4 fixing member 5 elastic member 6 check valve 6a valve body 7 2nd syringe 7a flange part 7b groove part (air flow path)
7c Spout 8 Second piston 9 Seal member 10 Retaining member 11 Seal plug A Cartridge B Operating instrument C1 Crevice C2 Crevice f Pressure receiving surface r1 Internal passage r2 Air flow path S1 Filling space (air)
S2 filling space (content liquid)

Claims (2)

  A first piston that has a first piston that pumps air in the first syringe and pushes out the air, and a valve body that is closed by the urging force of the elastic member, and the first piston between the valve body and the first syringe. A check valve provided with a pressure-receiving surface that forms a filling space for the air pushed out by the air and opens the valve body against the urging force of the elastic member in response to an increase in internal pressure of the filling space, and the valve body opens Air that has a second piston that can move with the pushed-out air as an urging force, and mixes the air that gives the urging force with the liquid in the filling space formed between the second piston and the second piston. An air mixing type ejector comprising a second syringe having a flow path formed inside.   The air mixing type ejector according to claim 1, wherein the air flow path is a groove formed on an inner peripheral surface of the second syringe.

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