Mixing device, bottle unit, and flat tire repair kit

Abstract

The invention provides a mixing device, a bottle unit and a flat tire repair kit capable of efficiently repairing a flat tire of an object. A mixing device is provided with: a mixing chamber having a space for mixing a flat tire repair liquid and compressed air; a first inlet for supplying compressed air to the mixing chamber; a second inlet for supplying the puncture repair liquid to the mixing chamber (8); and the outlet is used for discharging the mixture of the flat tire repair liquid and the compressed air from the mixing chamber. The second inlet is provided with a flow path including a first portion open to the mixing chamber and a second portion on the upstream side of the first portion. The first portion has a first flow path cross-sectional area. The second portion has a second flow path cross-sectional area greater than the first flow path cross-sectional area. The flow path includes a stepped portion that discontinuously changes a flow path cross-sectional area between the first portion and the second portion.

Description

Technical Field

[0001] The invention relates to a mixing device for mixing a flat tire repair fluid with compressed air, a bottle unit comprising the mixing device, and a flat tire repair kit comprising the bottle unit. Background Art

[0002] Conventionally, there are known puncture repair kits for repairing a punctured tire or other object. For example, Patent Document 1 below proposes a puncture repair kit for repairing a punctured tire by sequentially injecting a puncture repair fluid and compressed air into the punctured object using compressed air from a compressor.

[0003] Patent Document 1: Japanese Patent Application Publication No. 2017-056662

[0004] However, the flat tire repair kit of Patent Document 1 sequentially injects flat tire repair liquid and compressed air into a flat tire object, so the time required for flat tire repair tends to be longer, and further improvement is required in terms of efficiency of flat tire repair. Summary of the invention

[0005] The present invention has been made in view of the above-mentioned actual situation, and a main object of the present invention is to provide a mixing device, a bottle unit, and a flat tire repair kit that can efficiently repair a flat tire of an object.

[0006] The mixing device of the present invention is used to mix a flat tire repair liquid with compressed air, wherein the device comprises: a mixing chamber having a space for mixing the flat tire repair liquid with the compressed air; a first inlet for supplying the compressed air to the mixing chamber; a second inlet for supplying the flat tire repair liquid to the mixing chamber; and an outlet for discharging the mixture of the flat tire repair liquid and the compressed air from the mixing chamber, wherein the second inlet comprises a flow path, the flow path comprising: a first portion opening at the mixing chamber, and a second portion on the upstream side of the first portion, the first portion having a first flow path cross-sectional area, the second portion having a second flow path cross-sectional area larger than the first flow path cross-sectional area, and the flow path comprising a stepped portion, the stepped portion causing the flow path cross-sectional area to change discontinuously between the first portion and the second portion.

[0007] The mixing device of the present invention can efficiently repair a tire blowout of an object by having the above-mentioned structure. BRIEF DESCRIPTION OF THE DRAWINGS

[0008] Figure 1 It is a cross-sectional view showing one embodiment of the flat tire repair kit of the present invention.

[0009] Figure 2 It is a partially cutaway perspective view of a mixing device.

[0010] Figure 3 is a top view of the mixing device.

[0011] Figure 4 It is a top view of the mixing device of the second embodiment.

[0012] Figure 5 It is a partially cutaway perspective view of a mixing device according to a third embodiment.

[0013] Figure 6 It is a top view of the mixing device of the fourth embodiment.

[0014] Figure 7 It is a top view of the mixing device of the fifth embodiment.

[0015] Explanation of reference numerals: 4 ... mixing device; 8 ... mixing chamber; 9 ... first inlet; 10 ... second inlet; 11 ... outlet; 12 ... flow path; 12a ... first portion; 12b ... second portion; 12c ... stepped portion. DETAILED DESCRIPTION

[0016] Hereinafter, one embodiment of the present invention will be described in detail based on the drawings.

[0017] Figure 1 FIG. 2 is a cross-sectional view showing the tire blowout repair kit 1 according to the present embodiment. Figure 1 As shown, the flat tire repair kit 1 is suitable for filling a flat tire repair fluid R and compressed air A into an object T such as a flat tire, for example.

[0018] The flat tire repair kit 1 of the present embodiment includes: a bottle unit 2 for discharging a mixture of a flat tire repair liquid R and compressed air A toward an object T; and a compressor 3 for supplying compressed air A. The bottle unit 2 of the present embodiment includes: a mixing device 4 for mixing the flat tire repair liquid R and the compressed air A; and a container 5 for containing the flat tire repair liquid R. The mixing device 4 includes, for example, an adapter member 6 mounted on the container 5, and a cap member 7 mounted on the adapter member 6.

[0019] Such a bottle unit 2 facilitates the installation of the mixing device 4 and the container 5, which helps to shorten the time required for repairing a flat tire. In addition, the mixing device 4 can pre-mix the flat tire repair liquid R and the compressed air A before filling the object T, which can shorten the time required for repairing a flat tire. In addition, the mixing device 4 is not limited to such a form, and for example, it can also be an integrally molded product in which the adapter component 6 and the cover component 7 are integrated.

[0020] The container 5 has, for example, a mouth portion 5a for containing the flat tire repair fluid R in the container 5. The container 5 contains, for example, the flat tire repair fluid R from the mouth portion 5a. The mouth portion 5a has, for example, a film (not shown) for airtightly retaining the contained flat tire repair fluid R.

[0021] The mixing device 4 is preferably attached to the mouth 5a of the container 5. Such a container 5 does not need to form a separate outlet for taking out the flat tire repair liquid R, which contributes to a reduction in manufacturing cost.

[0022] The mixing device 4 of the present embodiment includes a mixing chamber 8 having a space for mixing the flat tire repair liquid R and the compressed air A. The mixing chamber 8 includes, for example, a top surface 8a located at the top when the mixing device 4 is mounted on the container 5 and used for flat tire repair, a bottom surface 8b located at the bottom, and a side surface 8c connecting the top surface 8a and the bottom surface 8b. The mixing chamber 8 has, for example, a cylindrical space in which the top surface 8a and the bottom surface 8b are circular.

[0023] The mixing device 4 of this embodiment includes a first inlet 9 for supplying compressed air A to the mixing chamber 8 and a second inlet 10 for supplying the flat tire repair liquid R to the mixing chamber 8. The first inlet 9 is communicated with, for example, a compressor 3 as a compressed air source. The second inlet 10 is communicated with, for example, a container 5 containing the flat tire repair liquid R.

[0024] Such a mixing device 4 can generate a mixture by causing the mixing chamber 8 to repeatedly be in a positive pressure state and a negative pressure state by pulsating the compressed air A supplied from the compressor 3 , thereby causing the flat tire repair fluid R in the container 5 to drip from the second inlet 10 into the mixing chamber 8 .

[0025] The mixing device 4 preferably includes an outlet 11 for discharging the mixture of the flat tire repair liquid R and the compressed air A from the mixing chamber 8. Such a mixing device 4 can supply the mixture of the flat tire repair liquid R and the compressed air A to the object T, and can shorten the time required for flat tire repair compared to the case where the flat tire repair liquid R and the compressed air A are supplied sequentially.

[0026] The first inlet 9 and the outlet 11 are provided, for example, in the cover member 7. The first inlet 9 and the outlet 11 of this embodiment are provided on the bottom surface 8b. The second inlet 10 is provided, for example, in the partition wall 6a of the adapter member 6. The second inlet 10 of this embodiment is provided on the top surface 8a.

[0027] Such a mixing device 4 discharges the mixture of the puncture repair fluid R dripping from the second inlet 10 located at the upper side and the compressed air A from the outlet 11 located at the lower side, thereby suppressing the accumulation of the dripping puncture repair fluid R and efficiently generating the mixture.

[0028] In addition, even in the mixing device 4 with the outlet 11 located at the bottom, if the supply amount of the flat tire repair liquid R dripping from the second inlet 10 is excessive, there is a greater risk that the flat tire repair liquid R will accumulate in the mixing chamber 8 and the outlet 11. The accumulation of the flat tire repair liquid R may cause clogging and may become an important factor that prevents efficient repair of a flat tire of the object T.

[0029] Generally, by reducing the flow path cross-sectional area of ​​the second inlet 10, the flat tire repair fluid R can be supplied slowly. On the other hand, the second inlet 10 having a small flow path cross-sectional area is difficult to process, which is a major factor in increasing manufacturing costs, and the risk of the flat tire repair fluid R being retained in the second inlet 10 also increases.

[0030] Figure 2 4 is a partially cutaway perspective view of the mixing device 4. Figure 2 As shown, the second inlet 10 of the present embodiment has a flow path 12, and the flow path 12 includes: a first portion 12a opened in the mixing chamber 8, and a second portion 12b on the upstream side of the first portion 12a. The first portion 12a has, for example, a first flow path cross-sectional area S1. The second portion 12b preferably has a second flow path cross-sectional area S2 greater than the first flow path cross-sectional area S1. Such a second inlet 10 is easy to process and can reduce manufacturing costs.

[0031] The flow path 12 of this embodiment includes a step portion 12c that discontinuously changes the flow path cross-sectional area between the first portion 12a and the second portion 12b. Such a flow path 12 generates a pressure loss in the flow path 12, thereby suppressing the flow rate of the tire repair fluid R and enabling the tire repair fluid R to be supplied slowly.

[0032] Thus, the second inlet 10 can optimize the hourly supply amount of the flat tire repair liquid R to the mixing chamber 8, suppress excessive supply of the flat tire repair liquid R to the mixing chamber 8, and suppress retention of the dripping flat tire repair liquid R. Therefore, the mixing device 4 of the present embodiment can efficiently repair a flat tire of the object T.

[0033] As a more preferred embodiment, the first portion 12a extends with a constant first flow path cross-sectional area S1. The second portion 12b preferably extends with a constant second flow path cross-sectional area S2. Such a second inlet 10 is easy to process and can reduce manufacturing costs.

[0034] The second flow path cross-sectional area S2 is preferably 150% to 300% of the first flow path cross-sectional area S1. Since the second flow path cross-sectional area S2 is 150% or more of the first flow path cross-sectional area S1, pressure loss can be reliably generated in the flow path 12. Since the second flow path cross-sectional area S2 is 300% of the first flow path cross-sectional area S1, it is possible to suppress the accumulation of the flat tire repair fluid R at the step portion 12c and efficiently supply the flat tire repair fluid R. From this point of view, the second flow path cross-sectional area S2 is more preferably 180% to 200% of the first flow path cross-sectional area S1.

[0035] The angle θ formed between the outer peripheral surface of the second portion 12b and the step surface of the step portion 12c is preferably 30° to 140°. Since the angle θ between the second portion 12b and the step portion 12c is 30° or more, the stagnation of the puncture repair fluid R at the step portion 12c can be suppressed, and the flow rate of the puncture repair fluid R can be suppressed. Since the angle θ between the second portion 12b and the step portion 12c is 140° or less, pressure loss can be reliably generated in the flow path 12. From this point of view, the angle θ between the second portion 12b and the step portion 12c is more preferably 45° to 100°.

[0036] The flow path length L1 of the first portion 12a is preferably 10% to 70% of the total length La of the flow path 12. Since the flow path length L1 of the first portion 12a is 10% or more of the total length La of the flow path 12, pressure loss can be generated in the first portion 12a, and the flow rate of the flat tire repair fluid R in the first portion 12a can be suppressed. Since the flow path length L1 of the first portion 12a is 70% or less of the total length La of the flow path 12, pressure loss can be reliably generated in the step portion 12c. From this point of view, the flow path length L1 of the first portion 12a is more preferably 20% to 40% of the total length La of the flow path 12.

[0037] In addition, flow path 12 for example also can comprise the third part (omitted illustration) whose flow path cross-sectional area is greater than the second flow path cross-sectional area S2 on the upstream side of second part 12b, and flow path cross-sectional area also can change in multistage. In addition, mixing device 4 for example also can be provided with the second next door (omitted illustration) on the upstream side of next door 6a, constitute the second inlet 10 with multistage.

[0038] Figure 3 4 is a top view of the mixing device 4. Figure 2 as well as Figure 3 As shown, the second inlet 10 has a plurality of flow paths 12, and in this embodiment, has three flow paths 12. Preferably, each cross section of the flow paths 12 is circular. Such a second inlet 10 is easy to process and can reduce manufacturing costs.

[0039] The maximum inner diameter φ1 of the first portion 12a is preferably 0.5 to 1.0 mm. Since the maximum inner diameter φ1 of the first portion 12a is 0.5 mm or more, it is easy to process and helps reduce manufacturing costs. The maximum inner diameter φ1 of the first portion 12a is 1.0 mm or less, which helps to generate pressure loss in the flow path 12.

[0040] The maximum inner diameter φ2 of the second portion 12b is preferably 1.0 to 3.0 mm. Since the maximum inner diameter φ2 of the second portion 12b is 1.0 mm or more, it helps to generate pressure loss in the flow path 12. Since the maximum inner diameter φ2 of the second portion 12b is 3.0 mm or less, it is possible to suppress the accumulation of the flat tire repair fluid R at the step portion 12c, and the flat tire repair fluid R can be efficiently supplied.

[0041] like Figure 1 As shown, the mixing chamber 8 may also include, for example, a protrusion 13 protruding from the top surface 8a toward the inside of the mixing chamber 8. For example, a conical shape having the most protruding vertex is suitable as the protrusion 13. Such a protrusion 13 can make the flow inside the mixing chamber 8 directional, and can efficiently discharge the mixture of the flat tire repair fluid R and the compressed air A.

[0042] The mixing chamber 8 may have a plurality of hemispherical recesses 14 formed on at least one of the top surface 8a, the bottom surface 8b, and the side surface 8c. Such a plurality of recesses 14 helps to smooth the flow and shorten the residence time of the mixture in the mixing chamber 8.

[0043] The adapter member 6 is, for example, screwed to both the mouth 5a of the container 5 and the cover member 7. The adapter member 6 and the mouth 5a are preferably sealed by a sealing member 15. The adapter member 6 and the cover member 7 are sealed by, for example, a secondary sealing member 16. Such an adapter member 6 makes it easy to attach to the container 5 and to the cover member 7, and the airtightness after attachment is also excellent.

[0044] like Figure 1 as well as Figure 3 As shown, the adapter member 6 has, for example, a rupture portion 17, and when the adapter member 6 is mounted on the mouth 5a of the container 5, the rupture portion 17 ruptures the film (not shown) of the mouth 5a. The rupture portion 17 is preferably arranged in an arc shape when viewed from above. Such a rupture portion 17 can rupture the film of the mouth 5a when the mixing device 4 is mounted on the container 5, and can supply the flat tire repair liquid R to the mixing chamber 8.

[0045] The flow path 12 of the second inlet 10 of this embodiment is provided on the same circumference as the rupture portion 17 in a plan view. Such a second inlet 10 can supply the flat tire repair liquid R to the vicinity of the side surface 8c of the mixing chamber 8, so that the flat tire repair liquid R in the mixing chamber 8 has excellent dispersibility, which contributes to efficient generation of the mixture.

[0046] Figure 4 FIG. 2 is a top view of a mixing device 20 according to a second embodiment. The same elements as those in the above-mentioned embodiment are denoted by the same reference numerals, and their descriptions are omitted. Figure 4 As shown, the flow path 12 of the second inlet 10 may be arranged at a position radially inward of the break portion 17, for example, when viewed from above. Such a second inlet 10 is arranged at the mouth 5a ( Figure 1 As shown in the figure, the tire puncture repair fluid R in the container 5 can be efficiently supplied to the mixing chamber 8.

[0047] Figure 5 FIG. 2 is a partially cutaway perspective view of a mixing device 30 according to a third embodiment. The same elements as those in the above-mentioned embodiment are denoted by the same reference numerals, and their descriptions are omitted. Figure 5 As shown, the mixing device 30 of the third embodiment includes a second inlet 31 for supplying the flat tire repair fluid R to the mixing chamber 8 similarly to the above-mentioned mixing device 4 .

[0048] The second inlet 31 has at least one flow path 32, and in the third embodiment, has one flow path 32. The flow path 32 of the third embodiment is a slit having a longitudinal cross section. Such a second inlet 31 can suppress clogging of the flow path 32 and efficiently supply the puncture repair fluid R even if rubber lumps are generated in the puncture repair fluid R in the container 5. In addition, the flow path 32 of the third embodiment can supply the puncture repair fluid R from the slit even when the viscosity of the puncture repair fluid R increases under low temperature conditions.

[0049] The flow path 32 of the second inlet 31 of the third embodiment includes, similarly to the flow path 12 described above, a first portion 32a opening in the mixing chamber 8, a second portion 32b on the upstream side of the first portion 32a, and at least one step 32c between the first portion 32a and the second portion 32b. Similar to the second portion 12b described above, the second flow path cross-sectional area S2 of the second portion 32b is preferably larger than the first flow path cross-sectional area S1 of the first portion 32a.

[0050] The width W1 of the first portion 32a of the slit in a direction perpendicular to the longitudinal direction is preferably 0.3 to 1.0 mm. Since the width W1 of the first portion 32a is 0.3 mm or more, processing is easy, which helps to reduce manufacturing costs. Since the width W1 of the first portion 32a is 1.0 mm or less, it helps to generate pressure loss in the flow path 32.

[0051] The width W2 of the second portion 32b of the slit in a direction perpendicular to the longitudinal direction is preferably 1.0 to 1.5 mm. Since the width W2 of the second portion 32b is 1.0 mm or more, it helps to generate pressure loss in the flow path 32. Since the width W2 of the second portion 32b is 1.5 mm or less, it is possible to suppress the accumulation of the flat tire repair fluid R at the step portion 32c, and the flat tire repair fluid R can be efficiently supplied.

[0052] The slit of the flow path 32 of the third embodiment extends linearly. Such a flow path 32 is easy to process and can reduce the manufacturing cost.

[0053] Figure 6 FIG. 4 is a top view of a mixing device 40 according to a fourth embodiment. The same elements as those in the above-mentioned embodiments are denoted by the same reference numerals, and their descriptions are omitted. Figure 6 As shown, the mixing device 40 of the fourth embodiment is provided with a device for mixing the mixing chamber 8 ( Figure 5 As shown in the figure, a second inlet 41 is provided to supply the flat tire repair fluid R.

[0054] The second inlet 41 of the fourth embodiment has a flow path 42 similarly to the second inlet 31. The flow path 42 of the fourth embodiment is a slit having a longitudinal cross section similarly to the flow path 32. Such a second inlet 41 is easy to process and can reduce manufacturing costs.

[0055] The slit of the flow path 42 of the fourth embodiment extends in a curved shape. Since such a second inlet 41 can be directed toward the side 8c ( Figure 1 Since the puncture repair liquid R is supplied near the mixing chamber 8, the dispersibility of the puncture repair liquid R in the mixing chamber 8 is excellent, which helps to efficiently generate the mixture.

[0056] Figure 7 FIG. 5 is a top view of a mixing device 50 according to a fifth embodiment. The same elements as those in the above-mentioned embodiments are denoted by the same reference numerals, and their descriptions are omitted. Figure 7 As shown, the mixing device 50 of the fifth embodiment is provided with a device for mixing the mixing chamber 8 ( Figure 5 As shown in the figure, a second inlet 51 is provided to supply the flat tire repair fluid R.

[0057] The second inlet 51 has a plurality of flow paths 52, and in the fifth embodiment, has three flow paths 52. The flow paths 52 of the fifth embodiment are slits having a longitudinal cross section similarly to the above-mentioned flow paths 42. Such a second inlet 51 is easy to process and can reduce manufacturing costs.

[0058] The slit of the flow path 52 of the fifth embodiment extends in a curved shape. Since such a second inlet 51 can be directed toward the side 8c ( Figure 1Since the puncture repair liquid R is supplied near the mixing chamber 8, the dispersibility of the puncture repair liquid R in the mixing chamber 8 is excellent, which helps to efficiently generate the mixture.

[0059] As mentioned above, although the particularly preferred embodiment of the present invention has been described in detail, the present invention is not limited to the above-mentioned embodiment, but can be modified and implemented in various forms.

[0060] [Example]

[0061] Based on the specifications in Table 1, a prototype with Figures 1 to 3 The mixing device of the basic structure shown in FIG. 1 was used to test the supply performance of the tire repair fluid. The supply performance test method is as follows.

[0062] <Supply performance>

[0063] The prototype mixing device was installed in a container containing puncture repair fluid, and the supply amount of puncture repair fluid per unit time when the mixture was discharged by connecting to a compressor was calculated as the average value of 100 measurements. The result was expressed as an index with the comparative example as 100, and the smaller the value, the more stable the supply of puncture repair fluid and the lower the risk of retention.

[0064] The test results are shown in Table 1.

[0065]

Table 1

[0066]

[0067] The test results confirmed that the mixing device of the embodiment provides a more stable supply of the flat tire repair fluid per unit time than the comparative example, reduces the risk of the flat tire repair fluid stagnating in the mixing chamber and the outlet, and can efficiently repair the flat tire of the object.

[0068] [Note]

[0069] The present invention is as follows.

[0070] [Present invention 1] A mixing device for mixing a tire puncture repair fluid with compressed air, comprising:

[0071] a mixing chamber having a space for mixing the flat tire repair fluid with the compressed air;

[0072] a first inlet for supplying the compressed air to the mixing chamber;

[0073] a second inlet for supplying the flat tire repair fluid to the mixing chamber; and

[0074] an outlet for discharging the mixture of the flat tire repair fluid and the compressed air from the mixing chamber,

[0075] The second inlet includes a flow path including a first portion opening at the mixing chamber and a second portion upstream of the first portion.

[0076] The first portion has a first flow path cross-sectional area,

[0077] The second portion has a second flow path cross-sectional area larger than the first flow path cross-sectional area,

[0078] The flow path includes a step portion that causes a cross-sectional area of ​​the flow path to change discontinuously between the first portion and the second portion.

[0079] [Present Invention 2] The mixing device according to present invention 1, wherein:

[0080] The first portion extends with a constant first flow path cross-sectional area,

[0081] The second portion extends with a constant second flow path cross-sectional area.

[0082] [Present invention 3] The mixing device according to present invention 1 or 2

[0083] The second flow path cross-sectional area is 150% to 300% of the first flow path cross-sectional area.

[0084] [Invention 4] The mixing device according to any one of Inventions 1 to 3, wherein:

[0085] The cross section of the flow path is circular.

[0086] [Invention 5] The mixing device according to invention 4, wherein:

[0087] The maximum inner diameter of the first part is 0.5 to 1.0 mm,

[0088] The maximum inner diameter of the second part is 1.0-3.0 mm.

[0089] [Invention 6] In the mixing device according to any one of Inventions 1 to 3,

[0090] The flow path is a slit having a longitudinal direction in its cross section.

[0091] [Invention 7] The mixing device according to invention 6, wherein:

[0092] The slit extends in a straight line.

[0093] [Present Invention 8] The mixing device according to present invention 6, wherein:

[0094] The slit extends in a curved shape.

[0095] [Invention 9] The mixing device according to any one of inventions 6 to 8, wherein:

[0096] The width of the first portion of the slit in a direction perpendicular to the longitudinal direction is 0.3 to 1.0 mm,

[0097] The width of the second portion of the slit in a direction perpendicular to the longitudinal direction is 1.0 to 1.5 mm.

[0098] [Invention 10] The mixing device according to any one of Inventions 1 to 9, wherein:

[0099] The flow path length of the first portion is 10% to 70% of the total length of the flow path.

[0100] [Invention 11] A bottle unit comprising: the mixing device according to any one of Inventions 1 to 10, and a container containing the flat tire repair liquid, wherein:

[0101] The container has a mouth portion, and the mouth portion is used to contain the flat tire repair liquid in the interior of the container.

[0102] The mixing device is mounted on the mouth.

[0103] [Present invention 12] A tire blowout repair kit, wherein:

[0104] It comprises: the bottle unit according to the present invention 11, and a compressor for supplying the compressed air.

Claims

1. A mixing device for mixing a tire repair fluid with compressed air, characterized in that: have: a mixing chamber having a space for mixing the flat tire repair fluid with the compressed air; a first inlet for supplying the compressed air to the mixing chamber; a second inlet for supplying the flat tire repair fluid to the mixing chamber; as well as an outlet for discharging the mixture of the flat tire repair fluid and the compressed air from the mixing chamber, The second inlet has a flow path including a first portion opening at the mixing chamber and a second portion upstream of the first portion. The first portion has a first flow path cross-sectional area, The second portion has a second flow path cross-sectional area larger than the first flow path cross-sectional area, The flow path includes a step portion that causes a cross-sectional area of ​​the flow path to change discontinuously between the first portion and the second portion.

2. The mixing device according to claim 1, characterized in that The first portion extends with a constant first flow path cross-sectional area, The second portion extends with a constant second flow path cross-sectional area.

3. The mixing device according to claim 2, characterized in that The second flow path cross-sectional area is 150% to 300% of the first flow path cross-sectional area.

4. The mixing device according to any one of claims 1 to 3, characterized in that The cross section of the flow path is circular.

5. The mixing device according to claim 4, characterized in that The maximum inner diameter of the first part is 0.5 to 1.0 mm, The maximum inner diameter of the second part is 1.0-3.0 mm.

6. The mixing device according to any one of claims 1 to 3, characterized in that The flow path is a slit having a longitudinal direction in its cross section.

7. The mixing device according to claim 6, characterized in that The slit extends in a straight line.

8. The mixing device according to claim 6, characterized in that The slit extends in a curved shape.

9. The mixing device according to claim 6, characterized in that The width of the first portion of the slit in a direction perpendicular to the longitudinal direction is 0.3 to 1.0 mm, The width of the second portion of the slit in a direction perpendicular to the longitudinal direction is 1.0 to 1.5 mm.

10. The mixing device according to any one of claims 1 to 3, characterized in that The length of the flow path of the first portion is 10% to 70% of the total length of the flow path.

11. A bottle unit, comprising: The mixing device according to any one of claims 1 to 3, and the container containing the flat tire repair liquid, are characterized in that: The container has a mouth portion, and the mouth portion is used to contain the flat tire repair liquid in the container. The mixing device is mounted on the mouth.

12. A tire blowout repair kit, characterized in that: include: The bottle unit according to claim 11, and a compressor for supplying said compressed air.

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