JP2007118310A - Puncture sealant supplying and extracting device of tire - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To impart both of the charging function and extracting function of a puncture sealant in an integrated system. <P>SOLUTION: This puncture sealant supplying and extracting device includes a pressure-resistant bottle 2, a device main body 3 to which the pressure-resistant bottle 2 can be attached and a supply hose means 4A for supplying the puncture sealant A housed in the pressure-resistant bottle 2 to a tire or extracting the same from the tire. The device body 3 is equipped with a Venturi flow channel 40 having a Venturi part 41, the second flow channel 18 extending from the Venturi flow channel 40 to reach the inside of the pressure-resistant bottle 2 and the third flow channel 19 which extends from the inside of the pressure-resistant bottle 2 and to which one end of the supply hose means 4A is connected. The Venturi flow channel 40 has an upstream flow channel part 42 reaching an air intake port 20 and a downstream flow channel part 43 reaching an on-off part 22 on both sides of the Venturi part 41 and is continued to the main flow channel part 43 at a position separated from the Venturi part 41 by a small distance L through the second flow channel 18. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  TECHNICAL FIELD The present invention relates to a tire puncture sealant feeding and extraction device that enables a puncture sealant to be loaded into a punctured tire or a puncture sealant loaded into the tire to be removed.

  As such an apparatus, one having a structure as shown in FIG. 7 has been proposed (see, for example, Patent Documents 1 and 2). In this apparatus a, a plastic container b that can be easily deformed is used, and the container b is squeezed (pressed) by hand to load the puncture sealing agent into the tire T (FIG. 7A). Thereafter, the container b is removed, a separate compressor is connected to the tire T and pumped up, and then the tire T is run, whereby the puncture hole is quickly sealed with the puncture sealing agent. This method is sometimes called a separation system.

  Then, the tire T that has been repaired urgently is brought into a tire repair place such as an automobile maintenance shop at an appropriate time, and is replaced with a new tire. At this time, it is necessary to remove the puncture sealing agent from the tire T, and as a result, as shown in FIG. 7B, the device a used at the time of loading is reused. Specifically, the hose c of the apparatus a is inserted into the tire from the valve mounting hole T1 from which the air valve is removed, and the container b is repeatedly deformed / returned by hand, and the puncture is caused by the suction force generated at that time. The sealing agent can be collected in the container b.

  On the other hand, as an emergency repair method for puncture, in addition to the separation system, a tire and a compressor are connected to a metal pressure vessel using a hose, and high pressure air from the compressor is supplied to the pressure vessel. It has been proposed that the puncture sealing agent in the tire is pumped into the tire and then the tire is automatically pumped up by the high-pressure air that flows subsequently (for example, Patent Document 3). This method may be referred to as an integrated system.

JP 2003-127242 A JP 2004-114524 A JP 2000-108215 A

  However, in the integrated system, since a high-pressure container is used, it is difficult to adopt a method for repeatedly deforming / returning the container as described above. Therefore, the integrated system has a problem that a suction device for removing the sealing agent is required separately.

  Therefore, in the Japanese Patent Application No. 2004-190045, as shown in FIG. 8A, the present inventor provided a venturi flow path in which a venturi section e1 having a narrow flow path diameter is provided in an air flow path connected to a high-pressure air source d. A device body using e is proposed. In this apparatus main body, the venturi flow path e and the inside of the pressure-resistant bottle f are connected by the flow path g extending from the venturi portion e1. When the other end e2 of the venturi flow passage e is closed, high-pressure air flows from the venturi section e1 through the flow passage g into the pressure resistant bottle f, and the puncture sealing agent in the pressure resistant bottle f is put into the tire. The tire can be pumped up by high-pressure air that is pumped and subsequently flows. When the other end e2 of the venturi flow passage e is opened, high-pressure air is discharged from the other end e2, and the negative pressure generated in the venturi portion e1 at that time reduces the pressure in the pressure-resistant bottle f, thereby puncture sealing in the tire. It becomes possible to suck the agent into the pressure-resistant bottle f and extract it.

  With this proposed device body, it is possible to switch between loading and unloading of the puncture sealant with a single touch in an integrated system, without increasing the device cost or complicating the device structure. In addition, it is possible to obtain an advantage that the dedicated suction device is unnecessary and the economy can be improved.

  On the other hand, when this proposed apparatus main body is plastic-molded, as shown in FIG. 8 (B), the pins p1 and p2 for forming the venturi flow path e and the pin p3 for forming the flow path g are provided on the mold. It is necessary to incorporate it. Here, the pins p1 and p2 can be connected to each other by fitting the tip portions. However, since the constricted portion p1a for forming the venturi portion e1 provided on one pin p1 has a small diameter, it is difficult in terms of strength to connect with the tip portion p3a of the pin p3 for forming the flow path g. The constricted part p1a and the tip part p3a are forced to be connected by the face-to-face contact. As a result, at the time of molding, there is a problem that burrs are generated at the abutting portion and a smooth air flow is prevented. In addition, it is necessary to lengthen the constricted portion p1a for abutment with the tip portion p3a, and therefore, the constricted portion p1a is bent by the pressure at the time of molding, thereby inhibiting the strength and durability of the mold. There is also the danger of doing.

  Therefore, the present invention provides an apparatus main body that can easily perform plastic molding without producing burrs and lowering the strength and durability of the mold while exhibiting the advantages equivalent to or more than the proposed apparatus main body. An object of the present invention is to provide a puncture sealant supply and extraction device for the tire used.

In order to achieve the above object, the invention of claim 1 of the present application is directed to supply of a puncture sealant for a tire that enables the puncture sealant to be loaded into the punctured tire or to be removed from the tire. A sampling device,
A pressure-resistant bottle that can store puncture sealants, a device body that can be equipped with this pressure-resistant bottle,
And a feed hose means for feeding the puncture sealing agent contained in the pressure bottle to the tire or pulling it back,
The apparatus main body is
A first flow path in which an air intake port that can be connected to a high-pressure air source is arranged at one end and an opening / closing portion that can be opened and closed is arranged at the other end;
A second flow path extending from a conduction port intersecting the first flow path and reaching the inside of the attached pressure-resistant bottle;
And the second flow path is a third flow path that communicates only inside the pressure-resistant bottle and has a connection port extending from the inside of the pressure-resistant bottle and connected to the feeding hose means at one end. With
In addition, the first flow path is a venturi flow in which an upstream main flow path section leading to the air intake port and a downstream main flow path section reaching the opening / closing section are provided on both sides of the venturi section having a reduced diameter. Road and
The conduction port is formed in the downstream main flow path part and at a position spaced a small distance L from the venturi part.

According to a second aspect of the present invention, the venturi flow path is characterized in that the venturi section and the downstream main flow path section are connected via a step surface perpendicular to the flow path length direction.
In the invention of claim 3, the venturi flow path has a diameter D1 of the downstream main flow path portion of 2 to 4 mm, a diameter D2 of the venturi portion of 1 to 2 mm, and a ratio D1 / of the diameters D1 and D2. D2 is set to 1.5 to 2.5.
According to a fourth aspect of the present invention, the second flow path includes a taper hole extending from the conduction port while expanding the diameter, and a straight hole-shaped flow path body extending from the taper hole to the inside of the pressure bottle. And the diameter d1 of the flow path body is 2 to 4 mm, and the diameter d2 of the conduction port is 1 to 2 mm.
According to a fifth aspect of the invention, the small distance L is larger than 0.5 times the diameter d2 of the conduction port and not more than 3.0 mm.
According to a sixth aspect of the present invention, the apparatus main body includes an attachment recess for fixing the neck portion of the pressure-resistant bottle and a boss portion that rises from the bottom surface of the attachment recess and extends into the neck portion. An air intake port at one end of the second flow path and a sealing agent outlet at one end of the third flow path are opened at the upper surface of the boss portion.
According to a seventh aspect of the present invention, the apparatus body includes an annular wall portion that rises from the bottom surface and surrounds the boss portion, and opens the air intake port between the annular wall portion and the boss portion. The tire puncture sealing agent feeding and extraction device according to claim 6, wherein a cap that covers the air intake port and the sealing agent outlet port is detachably fitted to the annular wall portion.

  Since the present invention is configured as described above, it is possible to provide both a loading function and a sampling function of a puncture sealing agent in an integrated system without causing an increase in apparatus cost and complexity of the apparatus structure. Yes, it can increase added value and improve usability. In addition, it can greatly contribute economically, such as eliminating the need for a dedicated suction device.

  Here, the venturi flow path includes a main flow path section on the downstream side of the venturi section, and the main flow path section and the second flow path are connected to each other at a small distance from the venturi section. When the other end side of the venturi channel is open, high-speed air passing through the venturi portion spreads rapidly in the main channel portion immediately after passing and is negatively adjoined by the vortex generated at that time in the vicinity of the venturi portion. Pressure can be generated. Therefore, similarly to the proposed apparatus main body, the pressure bottle can be decompressed through the second flow path, and the puncture sealing agent in the tire can be sucked out.

  In the present invention, the second flow path intersects not the venturi section but the large diameter main flow path section. Therefore, when the apparatus main body is molded by plastic, it is possible to connect the tip of the second flow path forming pin with the thick pin for forming the main flow path portion by fitting, generation of burrs, and strength of the mold. In addition, the apparatus main body can be easily formed by plastic molding without causing deterioration of durability.

Hereinafter, an embodiment of the present invention will be described with reference to the drawings.
FIG. 1 is a cross-sectional view illustrating a case where the puncture sealing agent feeding and extraction device of the present invention is used for emergency repair of puncture, and FIG. 2 is an enlarged cross-sectional view showing the main part thereof.

  As shown in FIG. 1, a puncture sealing agent feeding / extracting device 1 (hereinafter referred to as device 1) includes a pressure-resistant bottle 2 that can accommodate a puncture-sealing agent A, and a device main body 3 to which the pressure-resistant bottle 2 can be attached. A supply hose means 4A for supplying (or removing) the puncture sealing agent A in the pressure-resistant bottle 2 to the tire T is provided.

  The pressure-resistant bottle 2 is preferably a bottle-shaped pressure-resistant container having a pressure resistance of 800 kPa or more, and an outlet 2A1 for taking out the sealing agent is opened at the tip of the neck 2A.

  Next, as shown in FIG. 2, the apparatus main body 3 has, for example, a cylindrical body 12 and a mounting recess that is integrally formed with the body 12 and that inserts and fixes the neck 2 </ b> A of the pressure bottle 2. 13 and. In this example, the body 12 has a stepped column shape with a large diameter on one end side (the upper end side in FIG. 2), and the mounting recess 13 is recessed on the end surface on the large diameter side (the upper end surface in FIG. 2). Has been established. The mounting recess 13 includes an inner screw for screwing the neck 2 </ b> A of the pressure bottle 2 on the inner wall surface. Further, a packing material 14 is interposed between the bottom surface of the mounting recess 13 and the neck 2A, and the take-out port 2A1 is hermetically closed.

  Further, in the present embodiment, the mounting recess 13 has, for example, a cylindrical boss portion 15 that rises from the bottom surface and reaches the neck portion 2A of the pressure-resistant bottle 2, and an annular wall portion 7 that surrounds the periphery of the boss portion 15. Is protruding. The annular wall 7 is elastically fitted with a cap 6 that prevents the puncture sealing agent A in the pressure-resistant bottle 2 from flowing out during storage or the like.

  The body 12 has a first flow path 17 in which an air intake port 20 that can be connected to the high-pressure air source 5 is disposed at one end, and an opening / closing portion 22 that can be opened and closed is disposed at the other end. The second flow path 18 extending from the conduction port 16 intersecting with the first flow path 17 and reaching the inside of the pressure bottle 2 and the second flow path 18 communicate with each other only inside the pressure bottle 2 and A third flow path 19 is formed that extends from the inside of the pressure-resistant bottle 2 and is provided with a connection port 27A to which the feeding hose means 4A is connected at one end.

  Here, as shown in an enlarged view in FIG. 3, the first flow path 17 has an upstream main flow path section 42 that reaches the air intake port 20 on both sides of the venturi section 41 with a reduced diameter (flow path diameter). And a linear venturi channel 40 provided with a downstream main channel 43 reaching the opening / closing unit 22.

  In this example, the opening / closing part 22 is an opening / closing tool comprising a lid body 21, and the opening / closing of the exhaust port 23 opened on the other end side can be freely switched by attaching / detaching the opening / closing part 22. In this example, the air intake port 20 is formed as a connection port of the hose connection portion 26 to which one end of the supply hose means 4B for the high-pressure air extending from the high-pressure air source 5 is connected, but via the supply hose means 4B. It may be a connecting part that directly connects the high-pressure air source 5 without any problem.

  In the venturi flow path 40, the venturi section 41 and at least the downstream main flow path section 43 are connected in a stepped manner via a step surface 44 perpendicular to the flow path length direction. In this example, the main flow passage portion 42 and the main flow passage portion 43 have the same diameter, and the venturi portion 41 and the main flow passage portions 42 and 43 are connected to each other in a step shape through a step surface 44. ing. The main channel portion 42 and the main channel portion 43 may have different diameters, and the upstream main channel portion 42 and the venturi portion 41 can be smoothly connected by a tapered slope.

  The conduction port 16 where the venturi flow path 40 and the second flow path 18 intersect is formed in the downstream main flow path portion 43 and at a position separated from the venturi portion 41 by a small distance L. In other words, the small distance L is a distance from the downstream end of the venturi portion 41 to the center of the conduction port 16, and the small distance L is preferably set to 3.0 mm or less. This is because the high-pressure air from the high-pressure air source 5 passes through the venturi section 41 at a high speed when the opening / closing section 22 is open in the venturi flow path 40. The high-speed air rapidly spreads in the main flow path portion 43 immediately after passing, and at that time, an air vortex is generated at a position near the venturi portion 41. The vortex can generate a negative pressure in the vicinity, and a large negative pressure can be applied to the conduction port 16 by setting the small distance L to 3.0 mm or less.

  Next, the second flow path 18 extends upward from the conduction port 16 through the trunk portion 12, and the air inlet 24 at the upper end thereof is on the bottom surface of the mounting recess 13 and the boss portion 15. An opening is formed between the annular wall portion 7. The second flow path 18 includes a tapered hole portion 18A extending from the conduction port 16 while expanding in diameter, and a straight hole-shaped flow path body 18B extending from the tapered hole portion 18A to the air inlet 24. .

  Next, the third flow path 19 extends downward from the sealing agent outlet 25 opened at the upper end of the boss portion 15, and the lower end thereof is a hose connection portion to which one end of the feeding hose means 4 </ b> A is connected. 27 communication ports 27A.

  The air inlet 24 and the sealing agent outlet 25 are opened in the pressure bottle 2, so that the second and third flow paths 18 and 19 can communicate with each other only inside the pressure bottle 2.

  In this example, the sealing agent outlet 25 is formed as a central opening at the tip of the boss 15 rising along the axial center of the body 12.

  In the apparatus 1 of the present invention, the apparatus main body 3 is stored on-board with the pressure bottle 2 attached in advance. At the time of repairing the puncture, only piping work between the apparatus 1 and the high-pressure air source 5 by the hose means 4A and piping work between the apparatus 1 and the tire T by the hose means 4A are performed at the repair site. Therefore, it is necessary to prevent the puncture sealing agent A in the pressure-resistant bottle 2 from flowing into the second and third flow paths 18 and 19 during on-vehicle storage. For this purpose, the cap 6 is fitted to the annular wall portion 7 so as to cover the air inlet 24 and the sealing agent outlet 25 and hermetically close. In this example, a projecting plug body 6A for closing the sealing agent outlet 25 is provided on the bottom surface 6S of the cap 6 to further improve the airtightness.

  By providing such a cap 6, the puncture sealing agent A can be stored in the pressure-resistant bottle 2 without leaking even when stored in-vehicle with the apparatus main body 3 and the pressure-resistant bottle 2 attached in advance. it can. Therefore, in this example, the work of attaching the pressure-resistant bottle 2 and the apparatus main body 3 at the puncture repair site becomes unnecessary, and the work at the site can be simplified, and troubles such as spillage and leakage of the puncture sealing agent A accompanying the attachment work are eliminated. be able to.

  Next, the usage method of the apparatus 1 at the time of puncture repair is demonstrated.

  First, at the puncture repair site, as shown in FIG. 1, the high pressure air source 5 and the tire T are connected to the apparatus main body 3 with a pressure bottle through the hose means 4B and 4A, respectively. Thereafter, the high-pressure air source 5 is activated.

  At this time, the exhaust port 23 of the venturi channel 40 is closed by the opening / closing part 22. Therefore, the high-pressure air from the high-pressure air source 5 can flow into the cap 6 from the air inlet 24 through the supply hose means 4B, the air intake port 20, the venturi section 41, and the second flow path 18. As a result, the internal pressure in the cap 6 rises, and the cap 6 is lifted and automatically removed from the annular wall portion 7. As a result, the air inlet 24 is opened, and high-pressure air flows into the pressure-resistant bottle 2. The puncture sealing agent A in the pressure-resistant bottle 2 is fed to the tire T through the sealing agent outlet 25, the third flow path 19, the connection port 27A, and the feeding hose means 4A by the inflowing high-pressure air. The Further, after the supply of the puncture sealing agent A, the high-pressure air continues to flow, and the tire T can be automatically pumped up.

Here, as shown in FIG. 5A, the lifting force F1 to the cap 6 by the high-pressure air is obtained by the following equation (1). Therefore, the cap 6 can be removed from the annular wall portion 7 by setting the fitting force of the cap 6 to be smaller than the lifting force F1.
F1 = P1 × π (Y / 2) ² ---- (1)
P1 is the high pressure air pressure, π is the circular ratio, and Y is the diameter of the annular wall 7. In this example, since the diameter Y can be secured relatively large, the fitting force can also be set to a large value. Therefore, the sealing performance between the cap 6 and the annular wall portion 7 can be sufficiently improved, and the puncture sealant A can be prevented from leaking due to temperature rise or vibration during on-vehicle storage.

Further, the cap 6 is provided with a plug 6A for closing the sealing agent outlet 25. Here, at the time of puncture repair, when the residual pressure P2 remains in the tire, when piping to the tire T, a lifting force F2 (shown in FIG. 5B) to the cap 6 is applied by the residual pressure P2. . This lifting force F2 is expressed by the following equation (2). The inner diameter y of the sealing agent outlet 25 is sufficiently smaller than the diameter Y of the annular wall portion 7. Accordingly, the lifting force F2 can be suppressed to be lower than the lifting force F1, the cap 6 can be prevented from coming off due to the residual pressure P2, and the backflow of the puncture sealing agent A to the high-pressure air source 5 can be suppressed.
F2 = P2 × π (y / 2) ² ---- (2)

  In order to suppress this back flow more reliably, it is preferable to set the ratio Y / y between the diameter Y and the inner diameter y to 2 or more. The upper limit of the ratio Y / y is not particularly limited, but the ratio Y / y is preferably 30 or less from the viewpoint of designing the pressure bottle 2 to have a diameter of about 30 to 50 mm.

  In addition, it is preferable to set the fitting force of the cap 6 so that the cap 6 is removed when the internal pressure P1 is in a range of 100 to 300 kPa. That is, the internal pressure P1 is released when the pressure is 300 kPa or less, but it is preferable that the internal pressure P1 is not removed when it is less than 100 kPa. If it is removed at less than 100 kPa, the sealing performance becomes insufficient, and the puncture sealing agent A may leak during storage on the vehicle. If the pressure cannot be removed even at 300 kPa, it is necessary to unnecessarily increase the pressure resistance of the components such as the pressure bottle 2, the apparatus body 3, and the hose means 4A and 4B. Therefore, it is disadvantageous in terms of cost. In addition, it is necessary to prevent the puncture sealing agent A from flowing back to the high-pressure air source 5 even when piped to a tire that is used at a high internal pressure such as a heavy load tire. Therefore, it is also preferable that the cap 6 is fitted with such a strength that the residual pressure P2 is not removed when the residual pressure P2 is less than 800 kPa.

  The diameter Y of the annular wall portion 7 is preferably 10 to 40 mm, and if it is less than 10 mm, the lifting force F1 cannot be secured sufficiently large. Therefore, it is necessary to set the fitting force of the cap 6 to be low, and the sealing property tends to be insufficient. On the contrary, if it exceeds 40 mm, the apparatus main body 3 becomes large and wastes storage space.

  The inner diameter y of the sealing agent outlet 25 is preferably 0.5 to 5.0 mm. If the inner diameter y is less than 0.5 mm, the puncture sealing agent A is solidified at the sealing agent outlet 25 during feeding. As a result, the third flow path 19 may be clogged. If it exceeds 5.0 mm, the lifting force F2 generated by the residual pressure P2 increases. That is, the cap 6 is likely to come off, which may cause a back flow of the puncture sealing agent A. From such a viewpoint, the diameter Y is more preferably 20 to 30 mm, and the inner diameter y is more preferably 1 to 3 mm.

  Next, the usage method of the apparatus 1 at the time of extracting the puncture sealing agent A in a tire in a tire repair place etc. is demonstrated.

  As shown in FIG. 6, the same piping as that at the time of puncture repair is performed on the apparatus 1, the pressure bottle 2 is turned upside down, and the opening / closing part 22 is opened, so that the exhaust port 23 of the venturi channel 40 is opened. open. Further, after removing the air valve of the tire T to expose the valve mounting hole T1, the other end of the feeding hose means 4A is inserted from the valve mounting hole T1.

  In this state, the high-pressure air source 5 is operated. The high pressure air is exhausted from the air outlet 23 through the venturi flow path 40 and the exhaust outlet 23. At this time, as described above, at the position near the venturi section 41, the high-speed air that has passed through the venturi section 41 suddenly spreads in the main flow path section 43 to generate a vortex, and as a result, a negative pressure is also generated at the vicinity position. be able to. As a result, the negative pressure acts on the second flow path 18, the pressure bottle 2, the third flow path 19, and the supply hose means 4 </ b> A through the conduction hole 16 opened in the vicinity position, and The puncture sealing agent A in the tire T can be sucked and extracted from the other end of the feeding hose means 4A. The sucked puncture sealing agent A is automatically collected in the pressure-resistant bottle 2.

  Next, when the apparatus main body 3 is formed by plastic injection molding, the molding die includes pins Q1 and Q2 for forming the venturi flow path 40 and a second flow path as shown in FIG. At least a pin Q3 for forming 18 is used. At this time, one pin Q2 has a small-diameter portion Q2b for forming the venturi portion 41 protruding from the tip of the main portion Q2a on the large-diameter side, and the tip of the small-diameter portion Q2b and the tip of the pin Q1 are Can be connected by concavity and convexity fitting. On the other hand, in the present invention, the second flow path 18 is connected not to the venturi section 41 but to the main flow path section 43 on the large diameter side. That is, the pin Q3 is connected to the main portion Q2a instead of the small diameter portion Q2b of the pin Q2. Since the main portion Q2a has a larger diameter than the small-diameter portion Q2b, the main portion Q2a can be easily connected to the side surface by fitting unevenness. Accordingly, it is possible to prevent the occurrence of burrs at each connection position during molding. Further, since it is not connected to the small diameter portion Q2b, the small diameter portion Q2b can be shortened, and the bending and deformation of the small diameter portion Q2b due to molding pressure can be prevented. Is also possible.

  Here, in the venturi flow path 40, as shown in FIG. 3, the diameter D1 of the downstream main flow path section 43 is 2 to 4 mm, the diameter D2 of the venturi section 41 is 1 to 2 mm, and the diameters D1 and D2 The ratio D1 / D2 is preferably in the range of 1.5 to 2.5.

  When the diameter D1 is less than 2 mm and the diameter D2 is less than 1 mm, the mold strength cannot be sufficiently maintained, and the connection between the pins Q2 and Q3 is difficult. On the contrary, if the diameter D1 exceeds 4 mm and the diameter D2 exceeds 2 mm, a high-output and large-sized high-pressure air source 5 with a large flow rate is required, which is disadvantageous in terms of economy, weight, and mounting space. Become. On the other hand, if the ratio D1 / D2 is less than 1.5, a sufficient negative pressure cannot be generated and the suction force is insufficient. On the other hand, if the ratio D1 / D2 is larger than 2.5, the diameter D2 of the venturi portion 41 needs to be set smaller than 1 mm, for example, and the mold strength is lowered and the venturi portion 41 is clogged. The fear of etc. arises. In passenger car tires, 8V1 (outside diameter 7.7 mm) is usually used for the valve. Therefore, an 8V1 screw is preferable for the connection portion of the high-pressure air source, and therefore the diameter D1 is preferably about 3 mm.

  In the second flow path 18, the diameter d1 of the flow path body 18A is preferably 2 to 4 mm, and the diameter d2 of the conduction port 16 is preferably 1 to 2 mm. If the diameter d1 is less than 2 mm, the mold strength is insufficient. Conversely, if the diameter d1 exceeds 4 mm, a high-output and large-sized high-pressure air source 5 is required due to an increase in flow rate. If the diameter d2 exceeds 2 mm, the connection between the pins Q2 and Q3 by fitting becomes difficult. Therefore, the diameter d2 is preferably 50% or less of the diameter D1, but if the diameter d2 is less than 1 mm, there is a risk of clogging.

  In order to stabilize the air flow, a ratio D1 / d1 between the diameter D1 of the main flow path portion 43 of the venturi flow path 40 and the diameter d1 of the flow path body 18A of the second flow path 18 is set to 0.9 to 0.9. It is preferable to form it with the same diameter as 1.1.

  On the other hand, if the small distance L exceeds 3.0 mm, the negative pressure does not sufficiently act on the conduction port 16 and the suction force is insufficient. Conversely, if the distance L is less than 0.5 times the diameter d2 of the conduction port 16, It is difficult to connect the pins Q2 and Q3 by fitting.

  As mentioned above, although especially preferable embodiment of this invention was explained in full detail, this invention is not limited to embodiment of illustration, It can deform | transform and implement in a various aspect.

  The apparatus main body having the structure shown in FIGS. 1 and 2 was prototyped according to the following specifications, and the suction force from the hose connection part when the opening / closing part of the venturi flow path was opened was measured. The diameter D1 in the venturi channel is 3 mm, the diameter D2 is 1.5 mm, the diameter d1 in the second channel is 3 mm, the diameter d2 is 1.5 mm, and the formation position of the conduction hole (small distance L) is 2 mm.

  For comparison, an apparatus main body having the structure shown in FIG. 8A was prototyped and its suction force was measured.

  The suction force was measured by measuring the suction height when a hose was connected to the hose connection portion of the apparatus body and water was sucked vertically. When a small air compressor was used as the high-pressure air source, the suction force of the example product was 60 cm. The sucking force of the comparative product was 50 cm when the venturi portion had no burrs and had a good finish, but tended to vary from 5 to 50 cm depending on the finished state of the burrs.

It is sectional drawing which shows an example of the state in which the puncture sealing agent supply and extraction apparatus of this invention is used for emergency repair of a puncture. It is sectional drawing which expands and shows the principal part. It is sectional drawing which expands and shows a venturi flow path. It is sectional drawing which shows notionally a part of metal mold | die structure in the case of plastic-molding an apparatus main body. (A), (B) is sectional drawing explaining the lifting force which acts on a cap. It is sectional drawing which shows an example of the state in which the puncture sealing agent supply and extraction apparatus of this invention is used for extraction of the puncture sealing agent in a tire. (A), (B) is sectional drawing explaining an example of a prior art. (A) is sectional drawing which shows the apparatus main body as a comparison, (B) is sectional drawing which shows notionally a part of metal mold | die structure in the case of plastic-molding it.

2 Pressure-resistant bottle 2A Neck 3 Device body 4A Supply hose means 5 High pressure air source 6 Cap 7 Annular wall 13 Mounting recess 15 Boss 16 Conducting hole 17 First flow path 18 Second flow path 18A Taper hole 18B Flow Road body 19 Third flow path 20 Air intake port 22 Opening / closing section 25 Sealing agent outlet 27A Connection port 40 Venturi flow path 41 Venturi sections 42, 43 Main flow path section 44 Step surface A Puncturing sealant T Tire

Claims (7)

A puncture sealant feeding / extraction device for a puncture sealant capable of storing the puncture sealant, which allows the puncture sealant to be loaded into the punctured tire or to be removed from the tire. , The device body to which this pressure bottle can be attached,
And a feed hose means for feeding the puncture sealing agent contained in the pressure bottle to the tire or pulling it back,
The apparatus main body is
A first flow path in which an air intake port that can be connected to a high-pressure air source is arranged at one end and an opening / closing portion that can be opened and closed is arranged at the other end;
A second flow path extending from a conduction port intersecting the first flow path and reaching the inside of the attached pressure-resistant bottle;
And the second flow path is a third flow path that communicates only inside the pressure-resistant bottle and has a connection port extending from the inside of the pressure-resistant bottle and connected to the feeding hose means at one end. With
In addition, the first flow path is a venturi flow in which an upstream main flow path section leading to the air intake port and a downstream main flow path section reaching the opening / closing section are provided on both sides of the venturi section having a reduced diameter. Road and
A tire puncture sealant feeding and extracting device, wherein the conduction port is formed in the downstream main flow path portion and at a position separated from the venturi portion by a small distance L.   2. The tire puncture sealing agent feeding device according to claim 1, wherein the venturi flow path is formed by connecting the venturi section and the downstream main flow path section through a step surface perpendicular to the flow path length direction. Feeding and extraction device.   The venturi channel has a diameter D1 of the downstream main channel portion of 2 to 4 mm, a diameter D2 of the venturi portion of 1 to 2 mm, and a ratio D1 / D2 of the diameters D1 and D2 of 1.5 to 2. 5. The tire puncture sealant feeding and extracting device according to claim 1, wherein the tire puncture sealing agent is fed and extracted.   The second flow path includes a tapered hole extending from the conduction port while expanding in diameter, and a straight hole-shaped flow path main body extending from the tapered hole to the inside of the pressure-resistant bottle. 4. The tire puncture sealant feeding and extracting apparatus according to claim 1, wherein a diameter d1 of the main body is 2 to 4 mm and a diameter d2 of the conduction port is 1 to 2 mm.   The puncture sealing agent feeding of a tire according to any one of claims 1 to 4, wherein the small distance L is greater than 0.5 times the diameter d2 of the conduction port and 3.0 mm or less. Sampling device.   The apparatus body includes an attachment recess for fixing the neck portion of the pressure-resistant bottle and a boss rising from the bottom surface of the attachment recess and extending into the neck portion, and air at one end of the second flow path on the bottom surface. The tire puncture sealant supply according to any one of claims 1 to 5, wherein an intake port and a sealing agent outlet at one end of the third flow path are opened at an upper surface of the boss portion. , Sampling device.   The apparatus main body includes an annular annular wall portion that rises from the bottom surface and surrounds the boss portion, and opens the air intake port between the annular wall portion and the boss portion. 7. The tire puncture sealant feeding / extracting device according to claim 6, wherein a cap covering the air intake port and the sealing agent outlet port is detachably fitted.

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