Metering valve and aerosol-type product

Abstract

To provide a metering valve and an aerosol-type product, capable of suppressing a decrease in the ratio of the actual injection amount to the expected injection amount according to the volume of a metering chamber, even when the volume of the metering chamber is increased, while reducing the possibility that the injection force temporarily weakens during injection.SOLUTION: A metering valve 20 of an aerosol-type product using a liquified gas as a propellant has a partition 24a for partitioning the inside of a metering chamber 20a formed inside the metering valve 20. The partition 24a is shorter than the shortest length at which a phenomenon that injection force during the injection of the propellant temporarily weakens occurs.SELECTED DRAWING: Figure 2

Description

[Technical field]

[0001] The present invention relates to a metered dose valve for an aerosol product in which a liquefied gas is used as a propellant, and to an aerosol product. [Background technology]

[0002] The inventors of the present application discovered that when the volume of the metering chamber of a metering valve of an aerosol product using liquefied gas as a propellant is increased in order to increase the amount of spray per shot, the larger the volume of the metering chamber, the smaller the ratio of the actual amount of spray to the amount of spray expected according to the volume of the metering chamber.The inventors of the present application discovered that even if the volume of the metering chamber of the metering valve is increased, the decrease in the ratio of the actual amount of spray to the amount of spray expected according to the volume of the metering chamber can be suppressed by providing a partition within the metering chamber.

[0003] 2. Description of the Related Art Conventionally, metered dose valves having a partition provided within a metered dose chamber are known (see, for example, Patent Documents 1 and 2). [Prior art documents] [Patent documents]

[0004] [Patent Document 1] JP 2008-207873 A [Patent Document 2] JP 2018-034805 A Summary of the Invention [Problem to be solved by the invention]

[0005] However, the inventors of the present application have discovered a problem in that when a partition is provided in the metering chamber of a metering valve of an aerosol product that uses liquefied gas as a propellant, the force of the spray may temporarily weaken during spraying.

[0006] Therefore, the present invention aims to provide a metered dose valve and an aerosol product that can reduce the possibility of the spray force temporarily weakening during spraying, while suppressing a decrease in the ratio of the actual spray amount to the spray amount expected according to the volume of the metered dose chamber, even if the volume of the metered dose chamber is increased. [Means for solving the problem]

[0007] The metered dose valve of the present invention is a metered dose valve for an aerosol product using liquefied gas as a propellant, and is characterized in that it has a partition that separates a metered dose chamber formed inside the metered dose valve, and the length of the partition is shorter than the shortest length at which the force of the propellant temporarily weakens during spraying.

[0008] With this configuration, the metering valve of the present invention has a partition in the metering chamber, so even if the volume of the metering chamber is increased, the decrease in the ratio of the actual injection amount to the injection amount expected according to the volume of the metering chamber can be suppressed. Also, the metering valve of the present invention has a partition in the metering chamber that is shorter than the shortest length at which the injection force temporarily weakens during injection of the propellant, so the possibility of the injection force temporarily weakening during injection can be reduced. Therefore, even if the volume of the metering chamber is increased, the metering valve of the present invention can reduce the possibility of the injection force temporarily weakening during injection while suppressing the decrease in the ratio of the actual injection amount to the injection amount expected according to the volume of the metering chamber.

[0009] In the metered dose valve of the present invention, the partition may have a length of 6.75 mm or more.

[0010] With this configuration, the metering valve of the present invention is provided with a partition having a length of 6.75 mm or more within the metering chamber, so that even if the volume of the metering chamber is increased, the decrease in the ratio of the actual injection amount to the injection amount expected according to the volume of the metering chamber can be effectively suppressed.

[0011] In the metered dose valve of the present invention, the length of the partition may be equal to or greater than the distance between the base of the partition and the surface of the metered dose chamber facing the tip of the partition minus 17.35 mm.

[0012] With this configuration, the metering valve of the present invention has a partition within the metering chamber whose length is at least the distance between the base of the partition and the surface of the metering chamber facing the tip of the partition minus 17.35 mm, so that even if the volume of the metering chamber is increased, the decrease in the ratio of the actual injection amount to the injection amount expected according to the volume of the metering chamber can be effectively suppressed.

[0013] In the metered dose valve of the present invention, the length of the partition may be greater than or equal to the distance between the base of the partition and the surface of the metered dose chamber facing the tip of the partition, divided by 24.1 and multiplied by 6.75.

[0014] With this configuration, the metering valve of the present invention has a partition within the metering chamber whose length is greater than or equal to the distance between the base of the partition and the surface of the metering chamber facing the tip of the partition, divided by 24.1 and multiplied by 6.75, so that even if the volume of the metering chamber is increased, the decrease in the ratio of the actual injection amount to the injection amount expected according to the volume of the metering chamber can be effectively suppressed.

[0015] In the metered dose valve of the present invention, the length of the partition may be greater than or equal to the length at which the rate of change per unit length of the ratio of the actual injection amount to the expected injection amount according to the volume of the metered dose chamber is 0.

[0016] With this configuration, the metering valve of the present invention has a partition within the metering chamber that is longer than the length at which the rate of change per unit length of the ratio of the actual injection amount to the expected injection amount according to the volume of the metering chamber is zero, so that even if the volume of the metering chamber is increased, the decrease in the ratio of the actual injection amount to the expected injection amount according to the volume of the metering chamber can be effectively suppressed.

[0017] In the metered dose valve of the present invention, the volume of the metered dose chamber may be 2 cc or more.

[0018] With this configuration, the metering valve of the present invention can reduce the possibility of the injection force temporarily weakening during injection, while suppressing any decrease in the ratio of the actual injection amount to the injection amount expected according to the volume of the metering chamber, even if the volume of the metering chamber is 2 cc or more.

[0019] The aerosol product of the present invention is characterized by comprising the metered dose valve described above.

[0020] With this configuration, the aerosol product of the present invention can reduce the possibility of the spray force temporarily weakening during spraying, while suppressing a decrease in the ratio of the actual spray amount to the expected spray amount according to the volume of the metering chamber, even if the volume of the metering chamber of the metering valve is increased. Effect of the Invention

[0021] The metered dose valve and aerosol product of the present invention can reduce the possibility of the spray force temporarily weakening during spraying, while suppressing a decrease in the ratio of the actual spray amount to the expected spray amount according to the volume of the metered dose chamber, even if the volume of the metered dose chamber is increased. [Brief description of the drawings]

[0022] [Figure 1] 1 is a side cross-sectional view of an aerosol product according to one embodiment of the present invention. [Diagram 2] 2 is a side cross-sectional view of the metered dose valve shown in FIG. 1 with the stem not depressed. [Diagram 3] FIG. 3 is a side cross-sectional view of the metered dose valve shown in FIG. 2 with the stem depressed. [Figure 4] 1A is a side cross-sectional view of a metered dose valve without a partition, and FIG. 1B is a side cross-sectional view of a metered dose valve with a partition. [Diagram 5]5(a) and 5(b) are side cross-sectional views of a metered dose valve having a longer partition than that shown in FIG. 4(b), and FIG. 5(b) are side cross-sectional views of a metered dose valve having a longer partition than that shown in FIG. [Figure 6] 5(a) and 6(b) are cross-sectional side views of a metered dose valve having a longer partition than that shown in FIG. 5(b) and FIG. 6(b), respectively. [Figure 7] 7(a) and 7(b) are side cross-sectional views of a metered dose valve having a longer partition than that shown in FIG. 6(b), and FIG. 7(b) are side cross-sectional views of a metered dose valve having a longer partition than that shown in FIG. [Figure 8] (a) A diagram showing the results of a volumetric test on the metered dose valve shown in Figure 4(a). (b) A diagram showing the results of a volumetric test on the metered dose valve shown in Figure 4(b). (c) A diagram showing the results of a volumetric test on the metered dose valve shown in Figure 5(a). (d) A diagram showing the results of a volumetric test on the metered dose valve shown in Figure 5(b). [Figure 9] (a) A diagram showing the results of a volumetric test on the metered dose valve shown in Figure 6(a). (b) A diagram showing the results of a volumetric test on the metered dose valve shown in Figure 6(b). (c) A diagram showing the results of a volumetric test on the metered dose valve shown in Figure 7(a). (d) A diagram showing the results of a volumetric test on the metered dose valve shown in Figure 7(b). [Figure 10] (a) A diagram showing the results of a normal operation test on the metered dose valve shown in Figure 4(a). (b) A diagram showing the results of a normal operation test on the metered dose valve shown in Figure 4(b). (c) A diagram showing the results of a normal operation test on the metered dose valve shown in Figure 5(a). (d) A diagram showing the results of a normal operation test on the metered dose valve shown in Figure 5(b). [Figure 11] (a) A diagram showing the results of a normal operation test on the metered dose valve shown in Figure 6(a). (b) A diagram showing the results of a normal operation test on the metered dose valve shown in Figure 6(b). (c) A diagram showing the results of a normal operation test on the metered dose valve shown in Figure 7(a). (d) A diagram showing the results of a normal operation test on the metered dose valve shown in Figure 7(b). [Figure 12] FIG. 8 is a diagram showing the injection rate and injection state of the metered valve shown in FIGS. 4 to 7. [Figure 13] FIG. 13 is a diagram showing the relationship between the length of the partition and the injection ratio shown in FIG. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0023] Hereinafter, an embodiment of the present invention will be described with reference to the drawings.

[0024] First, the configuration of an aerosol product according to one embodiment of the present invention will be described.

[0025] FIG. 1 is a side cross-sectional view of an aerosol product 10 according to the present embodiment.

[0026] As shown in FIG. 1, an aerosol product 10 comprises a container 11 for storing liquefied gas as a propellant 90, a metered-dose valve 20 attached to the container 11 for spraying the propellant 90 in the container 11, and an actuator 12 attached to the metered-dose valve 20 for spraying the propellant 90 sprayed from the metered-dose valve 20.

[0027] 1, the actuator 12 is button-shaped, but may be in a shape other than a button shape, for example, the actuator 12 may be a spout shape.

[0028] Fig. 2 is a side cross-sectional view of the metered dose valve 20 when the stem 26 is not depressed. Fig. 3 is a side cross-sectional view of the metered dose valve 20 when the stem 26 is depressed.

[0029] As shown in FIG. 2 and FIG. 3, the metered dose valve 20 has a metered dose chamber 20a formed therein.

[0030] The metered quantity valve 20 comprises a mounting cup 21 attached to the opening of the container 11 (see FIG. 1), a packing 22 for sealing the gap between the opening of the container 11 and the mounting cup 21, a housing 23 held by the mounting cup 21, a volumetric tank 24 attached to the housing 23 for increasing the volume of the metered quantity chamber 20a, a bottom cover 25 attached to the volumetric tank 24 for sealing the opening of the volumetric tank 24, a stem 26 guided by the mounting cup 21 and the housing 23 so as to be movable in the extension direction of the stem 26, and the housing 23 connected to the stem 26 so as to be movable in the extension direction of the stem 26. It is equipped with an auxiliary stem 27 guided by the booster tank 24 and the bottom lid 25, a stem rubber 28 that is clamped by the mounting cup 21 and the housing 23 to close the gap between the stem 26 and the auxiliary stem 27, a cup rubber 29 that is clamped by the mounting cup 21 and the housing 23 to close the gap between the stem 26 and the auxiliary stem 27 when the stem 26 is pressed down, a spring 30 that is supported by the bottom lid 25 to bias the auxiliary stem 27, a bush 31 that is attached to the bottom lid 25 to clamp the cup rubber 29 between it and the bottom lid 25, and a dip tube 32 that is attached to the bush 31 to take the propellant 90 (see Figure 1) in the container 11 into the metered quantity valve 20.

[0031] The metered volume chamber 20a is formed by the housing 23, the increase tank 24, the bottom cover 25, the stem 26, the auxiliary stem 27, the stem rubber 28, and the cup rubber 29. The volume of the metered volume chamber 20a is about 2 cc.

[0032] The housing 23 has guide portions 23a at six positions spaced equally apart in the circumferential direction about the central axis, which guide the movement of the stem 26 by contacting the outer circumferential surface of the stem 26. The housing 23 also has bypass passages 23b, each having a diameter of, for example, 1 mm, which connect the space on the guide portion 23a side with the space on the auxiliary stem 27 side, at three positions spaced equally apart in the circumferential direction about the central axis.

[0033] The increase tank 24 is provided with a cylindrical partition 24a that separates the inside of the metered amount chamber 20a.

[0034] The bottom cover 25 has guide portions 25a for guiding the spring 30 when the metered quantity valve 20 is assembled, the guide portions 25a being provided at six positions at equal intervals in the circumferential direction around the central axis.

[0035] The actuator 12 (see FIG. 1) is attached to the stem 26. The stem 26 is formed with a hole 26a extending in the extension direction of the stem 26 and communicating with the actuator 12, and a stem hole 26b communicating with the hole 26a from the outer circumferential surface of the stem 26. The stem 26 is provided with an annular movement restricting portion 26c that restricts the movement of the stem 26 by contacting a stem rubber 28 when the metered dose valve 20 is in the state shown in FIG.

[0036] The auxiliary stem 27 has one guided portion 27a at each of four positions equally spaced circumferentially around the central axis, the guided portion 27a contacting the inner surface of the housing 23 so that the movement of the auxiliary stem 27 is guided by the housing 23.

[0037] The operation of the aerosol product 10 will now be described.

[0038] 2, the inside of the dip tube 32 and the inside of the metered dose chamber 20a communicate with each other via a gap between the auxiliary stem 27 and the cup rubber 29. Therefore, the liquid propellant 90 inside the container 11 is pushed by the pressure of the gaseous propellant 90 vaporized outside the metered dose valve 20 within the container 11, and is introduced from the inside of the dip tube 32 into the metered dose chamber 20a.

[0039] In the aerosol product 10, when the actuator 12 is operated to change the metered dose valve 20 from the state shown in Figure 2 to the state shown in Figure 3, the stem hole 26b communicates with the inside of the metered dose chamber 20a. Therefore, the propellant 90 in the metered dose chamber 20a is vaporized and sprayed from the actuator 12 through the stem hole 26b and hole 26a in that order from inside the metered dose chamber 20a.

[0040] When the metered dose valve 20 of the aerosol product 10 is in the position shown in FIG. 3 and the operation on the actuator 12 is released, the auxiliary stem 27 is moved by the biasing force of the spring 30 to return to the position shown in FIG. 2.

[0041] Next, a method for determining the length of the partition 24a will be described.

[0042] The inventors of the present application manufactured eight metered dose valves with partition lengths different from one another as shown in FIGS.

[0043] FIG. 4(a) is a side cross-sectional view of a metered dose valve 110 without a partition. FIG. 4(b) is a side cross-sectional view of a metered dose valve 120 with a partition. FIG. 5(a) is a side cross-sectional view of a metered dose valve 130 with a partition longer than that shown in FIG. 4(b). FIG. 5(b) is a side cross-sectional view of a metered dose valve 140 with a partition longer than that shown in FIG. 5(a). FIG. 6(a) is a side cross-sectional view of a metered dose valve 150 with a partition longer than that shown in FIG. 5(b). FIG. 6(b) is a side cross-sectional view of a metered dose valve 160 with a partition longer than that shown in FIG. 6(a). FIG. 7(a) is a side cross-sectional view of a metered dose valve 170 with a partition longer than that shown in FIG. 6(b). FIG. 7(b) is a side cross-sectional view of a metered dose valve 180 with a partition longer than that shown in FIG. 7(a).

[0044] The metered dose valve shown in Figs. 4 to 7 is in a state where the stem is not pressed down.

[0045] The volume of the metering chamber of the metering valve shown in Figs. 4 to 7 is about 2 cc.

[0046] The configuration of the metered dose valve 110 shown in FIG. 4(a) is similar to the configuration of the metered dose valve 20 shown in FIG. 2 with the partition 24a removed.

[0047] The configuration of the metered dose valve 120 shown in FIG. 4(b), the configuration of the metered dose valve 130 shown in FIG. 5(a), and the configuration of the metered dose valve 140 shown in FIG. 5(b) are each similar to the configuration of the metered dose valve 20 shown in FIG. 2, except that the partition 24a is shortened.

[0048] The metered dose valve 150 shown in FIG. 6(a) has the same configuration as the metered dose valve 20 shown in FIG.

[0049] The configuration of the metered dose valve 160 shown in FIG. 6(b) and the configuration of the metered dose valve 170 shown in FIG. 7(a) are similar to the configuration of the metered dose valve 20 shown in FIG. 2, except that the guide portion 25a is made smaller and the partition 24a is made longer.

[0050] The configuration of the metered dose valve 180 shown in Figure 7(b) is similar to the configuration of the metered dose valve 20 shown in Figure 2, except that the guide portion 25a has been removed, the partition 24a has been lengthened, and a guide portion that guides the spring 30 when assembling the metered dose valve 20 has been added to the partition 24a.

[0051] In the metered quantity valve shown in Figs. 4 to 7, the distance D between the base of the partition of the increasing tank and the surface of the bottom lid facing the tip of the partition is 24.1 mm.

[0052] The partition length d of the metered quantity valve 120 shown in FIG. 4(b) is 3.375 mm. The partition length d of the metered quantity valve 130 shown in FIG. 5(a) is 6.75 mm. The partition length d of the metered quantity valve 140 shown in FIG. 5(b) is 10.125 mm. The partition length d of the metered quantity valve 150 shown in FIG. 6(a) is 13.5 mm. The partition length d of the metered quantity valve 160 shown in FIG. 6(b) is 16.87 mm. The partition length d of the metered quantity valve 170 shown in FIG. 7(a) is 20.24 mm. The partition length d of the metered quantity valve 180 shown in FIG. 7(b) is 23.6 mm.

[0053] The inventors of the present application manufactured an aerosol type product equipped with a metered dose valve as shown in Figures 4 to 7, and confirmed the spray amount and spray state using the manufactured aerosol type product. The aerosol type products used to confirm the spray amount and spray state have the same configuration except for the metered dose valve.

[0054] First, the results of a test carried out to examine the volume of the metered volume chamber of the metered volume valve shown in Figs. 4 to 7 (hereinafter referred to as "volume test") will be described.

[0055] In order to check the volume of the metered chamber of the metered valve shown in Figs. 4 to 7, the inventor of the present application performed an operation of pressing the actuator of the aerosol product while shaking the aerosol product until the spraying stopped (hereinafter referred to as "shake-push"), and confirmed the spray amount and spray state. The duration of the shake-push was about 5 to about 10 seconds. The spray amount was calculated by subtracting the weight of the aerosol product after spraying from the weight of the aerosol product before spraying, and the weight of the sprayed propellant was obtained. For each of the metered valves shown in Figs. 4 to 7, shake-push was performed five times, the spray amount and spray state of each time were checked, and the average spray amount was also calculated. In addition, for the average spray amount, the volume of the propellant in a liquid state was also converted from the weight of the propellant. The spray state is a state in which a phenomenon in which the force of the spray temporarily weakens during spraying (hereinafter referred to as "breathing") occurs or not. The person who performs the test determines whether or not a breather occurs using his or her eyes and ears. For each of the metered valves shown in Figures 4 to 7, the second and subsequent tests were conducted with a sufficient time between them to reduce the influence of the previous test. The propellant used in the volumetric tests was LPG 0.39 MPa (20°C). The room temperature in the room where the volumetric tests were conducted was 26.6°C.

[0056] FIG. 8(a) is a diagram showing the results of a volumetric test on the metered dose valve 110 shown in FIG. 4(a). FIG. 8(b) is a diagram showing the results of a volumetric test on the metered dose valve 120 shown in FIG. 4(b). FIG. 8(c) is a diagram showing the results of a volumetric test on the metered dose valve 130 shown in FIG. 5(a). FIG. 8(d) is a diagram showing the results of a volumetric test on the metered dose valve 140 shown in FIG. 5(b). FIG. 9(a) is a diagram showing the results of a volumetric test on the metered dose valve 150 shown in FIG. 6(a). FIG. 9(b) is a diagram showing the results of a volumetric test on the metered dose valve 160 shown in FIG. 6(b). FIG. 9(c) is a diagram showing the results of a volumetric test on the metered dose valve 170 shown in FIG. 7(a). FIG. 9(d) is a diagram showing the results of a volumetric test on the metered dose valve 180 shown in FIG. 7(b).

[0057] From the results of the volume test shown in Figures 8 and 9, it was confirmed that the volume of the metered volume chamber of the metered volume valves shown in Figures 4 to 7 was about 2 cc. It was also confirmed that the metered volume valve 160 shown in Figure 6(b), the metered volume valve 170 shown in Figure 7(a), and the metered volume valve 180 shown in Figure 7(b) sometimes caused breathing when shaking and pushing.

[0058] Next, the results of a test carried out to examine the injection amount and injection state during normal operation of the metered valve shown in Figs. 4 to 7 (hereinafter referred to as "normal operation test") will be described.

[0059] In order to check the amount of spray and the spray state of the metered valve shown in Figs. 4 to 7 in normal operation, the inventor of the present application performed an operation of continuing to press the actuator of the aerosol product without shaking the aerosol product until spraying stopped (hereinafter referred to as "normal pressing"), and checked the amount of spray and the spray state. The duration of the normal pressing was about 2 seconds. The amount of spray was calculated by subtracting the weight of the aerosol product after spraying from the weight of the aerosol product before spraying, and the weight of the sprayed propellant was obtained. For each of the metered valves shown in Figs. 4 to 7, normal pressing was performed five times, the amount of spray and the spray state of each time were checked, and the average value of the amount of spray was also calculated. In addition, for the average amount of spraying, the volume of the propellant in a liquid state was also converted from the weight of the propellant. The spray state is a state in which a breather has occurred or not. Whether a breather has occurred or not is judged by the person who performs the test using visual and auditory senses. For each of the metered valves shown in Figs. 4 to 7, the second and subsequent tests were performed with a sufficient time from the previous test in order to reduce the influence of the previous test. The propellant used in the normal operation test was LPG 0.39MPa (20℃). The room temperature in the room where the normal operation test was conducted was 26.6℃.

[0060] FIG. 10(a) is a diagram showing the results of a normal operation test for the metered valve 110 shown in FIG. 4(a). FIG. 10(b) is a diagram showing the results of a normal operation test for the metered valve 120 shown in FIG. 4(b). FIG. 10(c) is a diagram showing the results of a normal operation test for the metered valve 130 shown in FIG. 5(a). FIG. 10(d) is a diagram showing the results of a normal operation test for the metered valve 140 shown in FIG. 5(b). FIG. 11(a) is a diagram showing the results of a normal operation test for the metered valve 150 shown in FIG. 6(a). FIG. 11(b) is a diagram showing the results of a normal operation test for the metered valve 160 shown in FIG. 6(b). FIG. 11(c) is a diagram showing the results of a normal operation test for the metered valve 170 shown in FIG. 7(a). FIG. 11(d) is a diagram showing the results of a normal operation test for the metered valve 180 shown in FIG. 7(b).

[0061] From the results of the normal operation test shown in Figures 10 and 11, it was confirmed that metered dose valve 160 shown in Figure 6(b), metered dose valve 170 shown in Figure 7(a), and metered dose valve 180 shown in Figure 7(b) may cause breathing pauses when pressed normally.

[0062] FIG. 12 is a diagram showing the ratio of the actual injection amount to the injection amount expected according to the volume of the metering chamber (hereinafter referred to as the "injection ratio") and the injection state for the metering valve 110 shown in FIGS.

[0063] In Figure 12, the injection ratio is the ratio of the average injection amount in the normal operation test to the average injection amount in the volumetric test, expressed as a percentage. In Figure 12, the injection state is indicated as having a breather if a breather occurred in at least one of the five normal operation tests.

[0064] As shown in Fig. 12, it was confirmed that the metered dose valve 110 shown in Fig. 4(a), the metered dose valve 120 shown in Fig. 4(b), the metered dose valve 130 shown in Fig. 5(a), the metered dose valve 140 shown in Fig. 5(b), and the metered dose valve 150 shown in Fig. 6(a) are metered dose valves that do not take a breath. On the other hand, it was confirmed that the metered dose valve 160 shown in Fig. 6(b), the metered dose valve 170 shown in Fig. 7(a), and the metered dose valve 180 shown in Fig. 7(b) are metered dose valves that take a breath. That is, it was confirmed that there is a high possibility that the breath will not take place even if the partition is lengthened at least up to the length of the partition of the metered dose valve 150 shown in Fig. 6(a). From the above, it was confirmed that the length of the partition of the metered dose valve 150 shown in Fig. 6(a) is shorter than the shortest length at which the force of the spray temporarily weakens during spraying of the propellant, i.e., the breath occurs.

[0065] FIG. 13 is a diagram showing the relationship between the length of the partition and the injection ratio shown in FIG.

[0066] As shown in Fig. 13, it was confirmed that the metered valve 130 shown in Fig. 5(a) and the metered valve 140 shown in Fig. 5(b) can obtain an injection rate almost the same as that of the metered valve 150 shown in Fig. 6(a), which is the metered valve with the highest injection rate among the metered valves that do not cause breathing. That is, when considering not only breathing but also the injection rate, it was confirmed that even if the partition length of the metered valve 150 shown in Fig. 6(a) is shortened at least to the length of the partition of the metered valve 130 shown in Fig. 5(a), an injection rate almost the same as that of the partition length of the metered valve 150 shown in Fig. 6(a) can be obtained. Note that the length of the partition of the metered valve 130 shown in Fig. 5(a) is 6.75 mm, which is the same length as the distance D minus 17.35 mm, and the same length as the distance D divided by 24.1 mm multiplied by 6.75 mm.

[0067] Furthermore, as shown in Figure 13, it was confirmed that even when the length of the partition is greater than or equal to the length at which the rate of change of the injection rate per unit length is 0, an injection rate approximately the same as that obtained when the length of the partition is the length of the partition of the metered valve 150 shown in Figure 6(a) can be obtained.

[0068] As described above, the metered dose valve 20 is provided with the partition 24a in the metered dose chamber 20a, so that even if the volume of the metered dose chamber 20a is increased, the decrease in the injection rate can be suppressed. In addition, the metered dose valve 20 can reduce the possibility of the injection rate temporarily weakening during injection when the length of the partition 24a provided in the metered dose chamber 20a is shorter than the shortest length at which a breath occurs, which is a phenomenon in which the injection rate temporarily weakens during injection of the propellant. Therefore, when the metered dose valve 20 is provided with the partition 24a in the metered dose chamber 20a that is shorter than the shortest length at which a breath occurs, the metered dose valve 20 can reduce the possibility of the injection rate temporarily weakening during injection, while suppressing the decrease in the injection rate, even if the volume of the metered dose chamber 20a is increased.

[0069] When the metering valve 20 has a partition 24a in the metering chamber 20a with a length of 6.75 mm or more, that is, the distance D minus 17.35 mm, the decrease in the injection rate can be effectively suppressed even if the volume of the metering chamber 20a is increased. Here, the distance D minus 17.35 mm is also the distance obtained by dividing the distance D by 24.1 and multiplying it by 6.75.

[0070] When the metering valve 20 is provided with a partition in the metering chamber that is longer than the length at which the rate of change of the injection rate per unit length is 0, the decrease in the injection rate can be effectively suppressed even if the volume of the metering chamber 20a is increased.

[0071] The metered quantity valve 20 can reduce the possibility of the injection force temporarily weakening during injection while suppressing a decrease in the injection rate, even if the volume of the metered quantity chamber 20a is 2 cc or more. [Explanation of symbols]

[0072] 10. Aerosol products 20. Quantitative Valve 20a Quantification room 24a Partition 90 Propellant 110, 120, 130, 140, 150, 160, 170, 180 metered dose valve

Claims

1. A metered dose valve for an aerosol product in which liquefied gas is used as a propellant, A partition is provided to separate a metering chamber formed inside the metering valve, A metered dose valve, wherein the length of the partition is shorter than the shortest length at which the force of the propellant temporarily weakens during injection.

2. 2. The metered dose valve according to claim 1, wherein the partition has a length of 6.75 mm or more.

3. 2. The metered quantity valve according to claim 1, wherein the length of the partition is equal to or greater than the distance between the base of the partition and the surface of the metered quantity chamber facing the tip of the partition minus 17.35 mm.

4. The metered quantity valve according to claim 1, characterized in that the length of the partition is equal to or greater than the distance between the base of the partition and the surface of the metered quantity chamber facing the tip of the partition divided by 24.1 and multiplied by 6.

75.

5. 2. The metering valve according to claim 1, wherein the length of the partition is equal to or greater than the length at which the rate of change per unit length of the ratio of the actual injection amount to the expected injection amount according to the volume of the metering chamber is 0.

6. 6. The metered volume valve according to claim 1, wherein the volume of the metered volume chamber is 2 cc or more.

7. 13. An aerosol product comprising the metered dose valve of claim 1.

Images