reserve tank

Abstract

The utility model discloses a kind of reserve tanks. Provide a kind of while being able to ensure the assembly easiness of O-ring, the reserve tank that O-ring can be inhibited from falling off from cover when cover is removed from tank body. The reserve tank of the utility model has: tank body, it has the substantially cylindrical shape cylinder portion of injection inlet formation in radial inner side;Cover, it can be closed injection inlet by substantially cylindrical shape closure portion is inserted into cylinder portion;And O-ring, it is embedded in the groove formed in the outer circumferential surface of closure portion, in order to keep O-ring closure portion has located more than groove and protruding flange portion to radial outer side axial front end side, the length of the outer circumference of flange portion is set to the length of easily assembling O-ring to closure portion, flange portion has the shape different according to circumferential from the center axis of closure portion to radial outer end distance, if the average of the distance is set as reference radius, it is provided with the distance greater than the reference radius large diameter portion.

Description

Technical Field

[0001] This utility model relates to a storage tank equipped with an O-ring. Background Technology

[0002] Patent Document 1 discloses a storage tank comprising: a tank body having a cylindrical portion with a circular inlet for injecting liquid formed radially inward; a lid having a generally cylindrical closing portion; and an O-ring inserted into a groove formed on the outer circumferential surface of the lid's closing portion. This storage tank allows the inlet to be closed by inserting the lid's closing portion into the cylindrical portion of the tank body. Furthermore, by closing the lid in this way, the O-ring embedded in the groove of the lid's closing portion seals the connection between the lid's closing portion and the cylindrical portion of the tank body. To retain the O-ring in the groove, a flange portion is provided in the lid's closing portion, located further axially towards the front end of the groove and protruding radially outward.

[0003] Patent Document 1: Japanese Patent Application Publication No. 2005-220846 Utility Model Content As with the storage tank disclosed in Patent Document 1, when a flange is provided on the axial front end side of the sealing portion of the lid, the flange is typically formed so that its radial outer end is rounded. In such a storage tank, when the O-ring is inserted into the groove during manufacturing, the O-ring needs to be temporarily stretched so that the flange can pass through the inner side of the O-ring. Therefore, if the outer diameter of the flange is set too large, it is difficult to assemble the O-ring due to the elongation characteristics of the O-ring. To prevent this problem, the outer diameter of the flange is set to a size that facilitates the assembly of the O-ring.

[0004] However, by setting the outer diameter of the flange to a size that facilitates the assembly of the O-ring, the flange sometimes passes through the inside of the O-ring and the O-ring falls off the cover when the lid is removed from the can body for inspection or maintenance.

[0005] Therefore, the purpose of this utility model is to provide a storage tank that can ensure the ease of assembly of the O-ring while preventing the O-ring from falling off the lid when the lid is removed from the tank body.

[0006] The storage tank of this utility model is characterized by comprising: a tank body having a cylindrical portion having a generally cylindrical shape with a circular inlet for injecting liquid formed radially inward; a cover having a generally cylindrical closure portion capable of closing the inlet by inserting the closure portion into the cylindrical portion; and an O-ring embedded in a groove formed on the outer circumferential surface of the closure portion, sealing the closure portion and the cylindrical portion when the closure portion is inserted into the cylindrical portion, wherein, in order to maintain the O-ring, the closure portion has a flange portion located further axially towards the front end of the groove and protruding radially outward toward the bottom surface of the groove, the outer circumferential length of the flange portion is set to a length that facilitates the assembly of the O-ring to the closure portion, the flange portion having a shape in which the distance from the central axis of the closure portion to the radially outer end varies circumferentially, and if the average value of the distance is set as a reference radius, then a large-diameter portion having a distance greater than the reference radius is provided.

[0007] Utility Model Effect This invention provides a storage tank that ensures ease of O-ring assembly while preventing the O-ring from falling off the lid when removing the lid from the tank body. Attached Figure Description

[0008] Figure 1 This is a cross-sectional view showing the shape of the cylindrical portion of the tank body and the closing portion of the lid of the storage tank according to the first embodiment.

[0009] Figure 2 This is a diagram showing the shape of the flange portion of the lid of the storage tank according to the first embodiment.

[0010] Figure 3 This is a diagram showing the shape of the flange portion of the lid of the storage tank according to the second embodiment.

[0011] Figure 4 This is a diagram showing the shape of the flange portion of the lid of the storage tank according to the third embodiment.

[0012] Figure 5 This is a diagram showing the shape of the flange portion of the lid of the storage tank according to the fourth embodiment.

[0013] Figure 6 This is a diagram showing the shape of the flange portion of the lid of the storage tank according to the fifth embodiment. Detailed Implementation

[0014] <First Embodiment> The following is for reference. Figures 1-2 The storage tank 10 of the first embodiment will be described. Figure 1 This is a cross-sectional view showing the shape of the cylindrical portion 11 of the tank body 1 and the closing portion 21 of the cover 2 of the storage tank 10. (Example) Figure 1As shown, the storage tank 10 includes: a tank body 1 having a cylindrical portion 11 of a generally cylindrical shape with a circular inlet for injecting liquid formed on the radially inner side; a cover 2 having a generally cylindrical closure portion 21; and an O-ring 3.

[0015] A groove 22, recessed radially inward, is formed on the outer peripheral surface of the closing portion 21 of the cover 2. To retain the O-ring 3 within the groove 22, the closing portion 21 of the cover 2 has a flange portion 23 that protrudes radially outward from the bottom surface 22a of the groove 22 and is located further axially towards the front end of the groove 22. A conical surface 24, whose outer diameter decreases to a conical shape towards the axial front end, is formed on the axial front end of the flange portion 23. Furthermore, a plane 25 perpendicular to the central axis of the closing portion 21 is formed at the axial front end of the closing portion 21 of the cover 2.

[0016] The O-ring 3 is embedded in the groove 22. The cap 2 can close the injection port by inserting the sealing part 21 into the cylindrical part 11 of the can body 1. When the cap 2 is closed in this way, and the sealing part 21 of the cap 2 is inserted into the cylindrical part 11 of the can body 1, the O-ring 3 is deformed and crushed radially along the sealing part 21, thus sealing the gap between the sealing part 21 and the cylindrical part 11.

[0017] When manufacturing the storage tank 10, when assembling the O-ring 3 to the closing portion 21 of the cover 2, the O-ring 3 abuts against the conical surface 24 of the closing portion 21 of the cover 2 and is pushed axially into the groove 22. Thus, the O-ring 3 extends to a length exceeding the outer circumference of the flange portion 23, and the O-ring 3 extends beyond the flange portion 23 into the groove 22. Once the O-ring 3 enters the groove 22, it retracts to its normal length and abuts against the bottom surface 22a of the groove 22. Thus, when the O-ring 3 is embedded in the groove 22, the O-ring 3 is held by the flange portion 23, so that the O-ring 3 remains in place even when... Figure 1 Even when gravity is applied downwards, it will not fall.

[0018] Figure 2 This is a diagram showing the shape of the flange 23 of the cover 2 of the storage tank 10. Figure 2 Indicates from Figure 1 Observe the bottom side to see the state of the O-ring 3 assembled into the cover 2 of the closure part 21. For example... Figure 2 As shown, the outer periphery of the flange 23 is formed by a gentle curve, and the length of the outer periphery of the flange 23 is set to a length that facilitates assembly when the O-ring 3 is assembled to the closing part 21 of the cover 2. Therefore, the storage tank 10 ensures the ease of assembly of the O-ring 3.

[0019] Furthermore, the flange portion 23 has a shape in which the distance from the central axis of the closure portion 21 to the radially outer end varies depending on the circumferential direction. Moreover, if the average distance from the central axis of the closure portion 21 to the radially outer end is set as the reference radius, the flange portion 23 has three large-diameter portions 26 at which the distance from the central axis of the closure portion 21 to the radially outer end of the flange portion 23 is greater than the reference radius. Thus, since the flange portion 23 has three large-diameter portions 26, the O-ring 3 can be prevented from falling off the cover 2 when the cover 2 is removed from the tank body 10.

[0020] <Second Implementation> Next, refer to Figure 3 The storage tank 20 of the second embodiment will now be described. Except for the shape of the flange 23a of the lid 2a, the storage tank 20 has the same structure as the storage tank 10 of the first embodiment. Therefore, the shape of the flange 23a of the lid 2a will be described below, and the same symbols will be used for the parts that are the same as those in the storage tank 10 of the first embodiment, and the description will be omitted.

[0021] Figure 3 This is a diagram showing the shape of the flange 23a of the cover 2a of the storage tank 20. Figure 3 This indicates the state in which the O-ring 3 is assembled into the closing part 21a of the cover 2a. For example... Figure 3 As shown, the outer periphery of the flange 23a is formed by a gentle curve, and the length of the outer periphery of the flange 23a is set to a length that facilitates assembly when the O-ring 3 is assembled to the closing portion 21a of the cover 2a. Therefore, the storage tank 20 ensures the ease of assembly of the O-ring 3.

[0022] Furthermore, the flange portion 23a has a shape in which the distance from the central axis of the closure portion 21a to the radially outer end varies depending on the circumferential direction. Moreover, if the average distance from the central axis of the closure portion 21a to the radially outer end of the flange portion 23a is set as the reference radius, the flange portion 23a has four large-diameter portions 26a at which the distance from the central axis of the closure portion 21a to the radially outer end is greater than the reference radius. Thus, since the flange portion 23a has four large-diameter portions 26a, the O-ring 3 can be prevented from falling off the cover 2a when the cover 2a is removed from the tank body 1.

[0023] <Third Implementation> Next, refer to Figure 4 The storage tank 30 of the third embodiment will now be described. Except for the shape of the flange portion 23b of the lid 2b, the storage tank 30 has the same structure as the storage tank 10 of the first embodiment. Therefore, the shape of the flange portion 23b of the lid 2b will be described below, and the same symbols will be used for the parts that are the same as those in the storage tank 10 of the first embodiment, and the description will be omitted.

[0024] Figure 4 This is a diagram showing the shape of the flange 23b of the cover 2b of the storage tank 30. Figure 4 This indicates the state in which the O-ring 3 is assembled into the closing part 21b of the cover 2b. For example... Figure 4 As shown, the outer periphery of the flange 23b is formed by a gentle curve, and the length of the outer periphery of the flange 23b is set to a length that facilitates assembly when the O-ring 3 is assembled to the closing portion 21b of the cover 2b. Therefore, the storage tank 30 ensures the ease of assembly of the O-ring 3.

[0025] Furthermore, the flange portion 23b has a shape in which the distance from the central axis of the closure portion 21b to the radially outer end varies depending on the circumferential direction. Moreover, if the average value of the distance from the central axis of the closure portion 21b to the radially outer end of the flange portion 23b is set as the reference radius, the flange portion 23b has a large-diameter portion 26b in one location where the distance from the central axis of the closure portion 21b to the radially outer end is greater than the reference radius. Thus, since the flange portion 23b has a large-diameter portion 26b in one location, the O-ring 3 can be prevented from falling off the cover 2b when the cover 2b is removed from the tank body 1.

[0026] <Fourth Implementation> Next, refer to Figure 5 The storage tank 40 of the fourth embodiment will now be described. Except for the shape of the flange 23c of the lid 2c, the storage tank 40 has the same structure as the storage tank 10 of the first embodiment. Therefore, the shape of the flange 23c of the lid 2c will be described below, and the same symbols will be used for the parts that are the same as those in the storage tank 10 of the first embodiment, and their descriptions will be omitted.

[0027] Figure 5 This is a diagram showing the shape of the flange 23c of the cover 2c of the storage tank 40. Figure 5 This indicates the state in which the O-ring 3 is assembled into the closing part 21c of the cover 2c. For example... Figure 5 As shown, the outer periphery of the flange 23c is formed by a gentle curve, and the length of the outer periphery of the flange 23c is set to a length that facilitates assembly when the O-ring 3 is assembled to the closing portion 21c of the cover 2c. Therefore, the storage tank 40 ensures the ease of assembly of the O-ring 3.

[0028] Furthermore, the flange portion 23c has a shape in which the distance from the central axis of the closure portion 21c to the radially outer end varies circumferentially. Moreover, if the average distance from the central axis of the closure portion 21c to the radially outer end of the flange portion 23c is set as the reference radius, the flange portion 23c has a large-diameter portion 26c with an arc shape in three locations where the distance from the central axis of the closure portion 21c to the radially outer end is greater than the reference radius. Thus, since the flange portion 23c has the large-diameter portion 26c in three locations, the O-ring 3 can be prevented from falling off the cover 2c when the cover 2c is removed from the tank body 1.

[0029] <Fifth Implementation> Next, refer to Figure 6 The storage tank 50 of the fifth embodiment will now be described. Except for the shape of the flange portion 23d of the lid 2d, the storage tank 50 has the same structure as the storage tank 10 of the first embodiment. Therefore, the shape of the flange portion 23d of the lid 2d will be described below, and the same symbols will be used for the parts that are the same as those in the storage tank 10 of the first embodiment, and the description will be omitted.

[0030] Figure 6 This is a diagram showing the shape of the flange 23d of the cover 2d of the storage tank 50. Figure 6 This indicates the state in which the O-ring 3 is assembled into the closing part 21d of the cover 2d. For example... Figure 6 As shown, the outer periphery of the flange 23d is formed by a gentle curve, and the length of the outer periphery of the flange 23d is set to a length that facilitates assembly when the O-ring 3 is assembled to the closing portion 21d of the cover 2d. Therefore, the storage tank 50 ensures the ease of assembly of the O-ring 3.

[0031] Furthermore, the flange portion 23d has a shape in which the distance from the central axis of the closure portion 21d to the radially outer end varies depending on the circumferential direction. Moreover, if the average value of the distance from the central axis of the closure portion 21d to the radially outer end of the flange portion 23d is taken as the reference radius, the flange portion 23d has a large-diameter portion 26d with an arc shape in one part where the distance from the central axis of the closure portion 21d to the radially outer end is greater than the reference radius. Thus, since the flange portion 23d has a large-diameter portion 26d in one part, the O-ring 3 can be prevented from falling off the cover 2d when the storage tank 50 is removed from the tank body 1.

[0032] <Supplement to the Implementation Method> The storage tank of this utility model is not limited to the above-described manner and can be implemented in various ways within the scope of the spirit of this utility model. For example, the flange portion may have five or more large-diameter portions.

[0033] Symbol Explanation 1-Tank body; 2, 2a, 2b, 2c, 2d-Lid; 3-O-ring; 10, 20, 30, 40, 50-Storage tank; 11-Cylindrical part; 21, 21a, 21b, 21c, 21d-Sealing part; 22-Groove; 22a-Bottom surface; 23, 23a, 23b, 23c, 23d-Flange part; 24-Conical surface; 25-Flat surface; 26, 26a, 26b, 26c, 26d-Large diameter part.

Claims

1. A storage tank, characterized in that, have: The main body of the tank has a cylindrical portion of a generally cylindrical shape with a circular inlet for injecting liquid formed on the radially inner side; A cap having a generally cylindrical closure portion that closes the injection port by inserting the closure portion into the cylindrical portion; and An O-ring, which is embedded in a groove formed on the outer peripheral surface of the closure portion, seals the connection between the closure portion and the cylindrical portion when the closure portion is inserted into the cylindrical portion. To maintain the closure portion of the O-ring having a flange portion located further axially towards the front end of the groove and projecting radially outward toward the bottom surface of the groove, The length of the outer periphery of the flange is set to a length that facilitates the assembly of the O-ring to the closure. The flange portion has a shape in which the distance from the central axis of the closed portion to the radial outer end varies depending on the circumferential direction. If the average value of the distance is set as the reference radius, then the flange portion has a large diameter portion where the distance is greater than the reference radius.

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