Cartridge

Abstract

To prevent a welded part from coming into contact with a seal member for sealing a case even when a liquid storage bag stored in the case of a cartridge in a state where the welded part is folded is deformed with consumption of liquid.SOLUTION: A cartridge including a liquid containing bag, a case having a containing portion capable of containing the liquid containing bag, and a seal member for sealing an opening of the containing portion, the cartridge being capable of supplying a liquid contained in the liquid containing bag to an outside, the liquid containing bag includes a first welding portion formed on a first side facing the first inner wall surface, a second welding portion formed on a second side facing the second inner wall surface, and a lead-out port provided in the first welding portion and capable of leading out the liquid to an outside, the lead-out port is fixed to the first inner wall surface, and the second inner wall surface protrudes toward an inside of the containing portion, A regulating portion that is interposed between the second welding portion and the seal member and regulates movement of the second welding portion in a direction toward the seal member is provided.SELECTED DRAWING: Figure 3

Description

[Technical Field]

[0001] The present invention relates to a cartridge for containing a liquid. [Background technology]

[0002] Inkjet recording devices are equipped with cartridges that contain ink, supply ink from the cartridge to a recording head, and eject the ink from the recording head onto a recording medium such as paper, thereby performing recording on the recording medium. The cartridge is a liquid container that contains ink to be supplied to the recording head and is detachable from the recording device. Some cartridges have an ink bag made of a flexible material housed inside a case, and the ink is housed inside the ink bag. For example, in the cartridge disclosed in Patent Document 1, the ink bag is housed in a box-shaped first case that is open on one side, and a film is airtightly bonded to the edge of the opening of the first case to form an airtight space inside the first case, and a second case is attached to cover the film.

[0003] The ink bag is formed by welding together films made of flexible material at their peripheries. The welded part forms a protrusion that protrudes outward from the bag part that contains the ink. This welded part cannot contain ink, but the shape of the welded part determines the outer shape of the ink bag. The case that contains the ink bag requires space to accommodate the welded part, which reduces the ratio of the amount of ink that can be contained to the volume of the case (volume efficiency). [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Japanese Patent Application Publication No. 2016-187877 Summary of the Invention [Problem to be solved by the invention]

[0005] To improve volumetric efficiency, it is conceivable to fold the welded portion and store it in the case, but the ink bag inside the case deforms as ink is consumed, and the folded welded portion may come into contact with the film sealing the case and damage the film.

[0006] To prevent a liquid containing bag housed in a cartridge case with the welded portion folded from coming into contact with a sealing member that seals the case, even if the liquid containing bag is deformed as the liquid is consumed. [Means for solving the problem]

[0007] The present invention provides a liquid containing bag formed into a bag shape by welding flexible members; a case having a storage portion capable of storing the liquid storage bag; a sealing member that seals the opening of the storage portion; a cartridge capable of supplying the liquid contained in the liquid containing bag to an outside, The storage portion has a first inner wall surface and a second inner wall surface facing the first inner wall surface, The liquid containing bag is a first welded portion formed on a first side facing the first inner wall surface; a second welded portion formed on a second side facing the second inner wall surface; an outlet provided in the first welded portion and capable of discharging liquid to the outside; and The outlet is fixed to the first inner wall surface, The second inner wall surface has a protrusion protruding toward the inside of the accommodating portion and interposed between the second welded portion and the seal member to restrict movement of the second welded portion in a direction toward the seal member. The cartridge is characterized by being provided with a regulating portion. [Effects of the Invention]

[0008] According to the present invention, even if a liquid containing bag housed in a cartridge case with the welded portion folded is deformed as the liquid is consumed, the welded portion can be prevented from coming into contact with the sealing member that seals the case. [Brief explanation of the drawings]

[0009] [Figure 1] FIG. 2 is a perspective view of the cartridge of the first embodiment. [Figure 2] FIG. 2 is an exploded view of the cartridge of the first embodiment. [Figure 3] FIG. 2 is a perspective view showing the internal structure of the cartridge of the first embodiment. [Figure 4] FIG. 2 is a cross-sectional view of the cartridge of the first embodiment. [Figure 5] FIG. 10 is a top view showing the internal structure of the cartridge of Example 2. [Figure 6] FIG. 10 is a cross-sectional view of a cartridge according to a third embodiment. [Figure 7] FIG. 10 is a cross-sectional view of a cartridge according to a fourth embodiment. [Figure 8] FIG. 10 is an exploded view of the cartridge of Example 4. DETAILED DESCRIPTION OF THE INVENTION

[0010] Hereinafter, exemplary embodiments for carrying out the present invention will be described with reference to the drawings. However, the dimensions, materials, shapes, and relative positions of the components described in the following examples may be changed as appropriate depending on the configuration of the device to which the present invention is applied and various conditions, and the scope of the present invention is not intended to be limited to the following examples. In the following description, components having the same function will be given the same numbers in the drawings, and their description may be omitted.

[0011] Example 1 The cartridge of Example 1 is used as an ink tank to be mounted in a liquid ejection device such as an inkjet printer. Note that the ink in Example 1 is an example of a liquid that can be stored in the cartridge of the present invention, and the cartridge of the present invention is not limited to ink and can also be applied to liquids other than ink.

[0012] FIG. 1 is a perspective view of a cartridge 10 of Example 1. FIG. 2 is an exploded view of the cartridge 10 of Example 1. In the following description, the longitudinal direction of the cartridge 10 is defined as the X direction, the lateral direction as the Y direction, and the thickness direction as the Z direction. The cartridge 10 has a substantially rectangular parallelepiped shape, and the X direction, Y direction, and Z direction are perpendicular to one another. Note that the shape of the cartridge 10 described in Example 1 is an example, and the shape of the cartridge of the present invention is not limited to a rectangular parallelepiped shape. Note that a regulating portion 15, which will be described later, is not shown in FIG. 2.

[0013] The cartridge 10 has a housing 11 that houses an ink bag 14, which is a liquid containing bag that stores ink, and a film-like sealing member 12 provided inside the housing 11. An example of the material of the housing 11 is resin. The housing 11 has a box-shaped case 20 that is open on one side in the Z direction, and a cover 19 that is a lid member that covers the opening of the case 20. The cartridge 10 is capable of supplying ink, which is a liquid contained in the ink bag 14, to the outside.

[0014] The case 20 has a storage section 31 capable of storing the ink bag 14. The storage section 31 has an opening 40 on one side in the thickness direction (Z direction) of the ink bag 14. The seal member 12 seals the opening 40 of the storage section 31 of the case 20. The storage section 31 has an upper wall 35 which is a first inner wall surface, and a lower wall 33 which is a second inner wall surface facing the first inner wall surface. The storage section 31 also has a first side wall 341 which is a third inner wall surface extending in a direction intersecting the upper wall 35 and the lower wall 33, and a second side wall 342 which is a fourth inner wall surface facing the first side wall 341.

[0015] The ink bag 14 is a liquid containing bag formed by joining flexible material by heat welding or the like. The ink bag 14 has a generally rectangular shape overall, with a first welded portion 17 formed along a first side 170 extending in the X direction and a second welded portion 18 formed along a second side 180 on the opposite side in the Y direction from the first side 170. The first side 170 of the ink bag 14 faces the upper wall 35 of the case 20, and the second side 180 faces the lower wall 33 of the case 20. A flow path forming member 13 having an outlet 16 through which liquid can be discharged to the outside is welded to the first welded portion 17.

[0016] The first welded portion 17 and the second welded portion 18 are formed by welding a flexible material, and are planar protrusions that protrude outward (in the Y direction) from the bag portion 30 that stores the ink. The first welded portion 17 and the second welded portion 18 are portions of the ink bag 14 that cannot store ink, but they define the outer shape of the ink bag 14. The storage portion 31 in the case 20 that stores the ink bag 14 has a volume that can store the first welded portion 17 and the second welded portion 18.

[0017] 2, the ink bag 14 is accommodated in the accommodation section 31 with the second welded section 18 bent in the Z direction from the second side 180 toward the sealing member 12. Therefore, the tip 32 of the second welded section 18 extends in a direction parallel to the Z direction or nearly parallel to the Z direction from the bag section 30 toward the sealing member 12 inside the housing 11.

[0018] The containing section 31 is formed in a box shape by a lower wall 33, a first side wall 341, a second side wall 342, an upper wall 35, and a bottom wall 37, and can contain the ink bag 14 inside. The lower wall 33 and the upper wall 35 face each other in the Y direction and each extend flatly in the XZ directions. The first side wall 341 and the second side wall 342 face each other in the X direction and each extend flatly in the YZ directions. The bottom wall 37 extends flatly in the XY directions. A recess 36 is formed in the center of the upper wall 35 in the X direction, and the flow path forming member 13 is contained in the recess 36. The flow path forming member 13 is fixed to the upper wall 35 of the case 20 by snap fitting or press fitting.

[0019] The flexible member that makes up the ink bag 14 can be made to have a layered structure that includes a highly flexible material that is easily deformed, thereby improving the ease of disposable liquid. For example, the flexible material can be made to have a layered structure that includes nylon, which increases impact resistance, an aluminum layer that prevents evaporation of the liquid, and polyethylene film, which is a highly flexible material.

[0020] The flow path forming member 13 is preferably made of the same material as the layer forming the inside of the ink bag 14. This allows the flow path forming member 13 to be welded to the ink bag 14 by heat welding or the like. In addition, by making the ink bag 14 into a gusset bag shape, the volume can be increased.

[0021] The seal member 12 is welded to the end face 21 (end face perpendicular to the Z direction) of the opening 40 of the case 20. This makes the storage section 31, which is the area of ​​the case 20 where the ink bag 14 is stored, a sealed space.

[0022] Fig. 3 is a perspective view showing the internal structure of the cartridge 10 of Example 1. Fig. 4 is a cross-sectional view of the cartridge 10 taken along line AA in Fig. 3. Note that the seal member 12 and the cover 19 are omitted from Fig. 3. The cover 19 is also omitted from Fig. 4.

[0023] The lower wall 33 is provided with a restricting portion 15 that protrudes in the Y direction from the end in the Z direction (the end on the sealing member 12 side) toward the inside of the storage section 31. The restricting portion 15 has a shape like an eave on the lower wall 33. In other words, a recess 38 is formed by the restricting portion 15, the lower wall 33, and the lower part of the bottom wall 37 (the part close to the lower wall 33 in the Y direction). The depth of the recess 38 in the Y direction is determined by the width of the restricting portion 15 in the Y direction. The lower part of the ink bag 14 (the part close to the lower wall 33 in the Y direction) is inserted into the recess 38. 4, the restricting portion 15 is interposed between the tip 32 of the second welded portion 18 and the seal member 12, and the movement of the second welded portion 18 in the direction toward the seal member 12 is restricted.

[0024] If the ink bag 14 moves within the storage section 31 of the case 20 or if the ink bag 14 deforms as ink is consumed, the second welded section 18 on the opposite side moves because the flow path forming member 13 of the first welded section 17 of the ink bag 14 is fixed to the case 20. Even in such a case, the tip 32 of the second welded section 18 abuts against the restricting section 15, and is restricted from moving toward the seal member 12. This prevents the tip 32 of the second welded section 18 from coming into contact with the seal member 12 and damaging it.

[0025] If the width a of the restricting portion 15 in the Y direction is at least equal to or greater than the thickness (size in the Y direction) of the second welded portion 18 in the bent state, it is possible to prevent the tip 32 from moving toward the seal member 12. In other words, the restricting portion 15 protrudes to a position closer to the upper wall 35 (first inner wall surface side) than the position of the tip 32 of the second welded portion 18 bent toward the seal member 12. It is more preferable that the width a of the restricting portion 15 in the Y direction is greater than the size of the range in the Y direction over which the tip 32 of the second welded portion 18 can move.

[0026] Because the flow path forming member 13 of the first welded portion 17 of the ink bag 14 is fixed to the case 20, as ink is consumed, the ink bag 14 may be deformed and warped upward toward the seal member 12. If the range in the Y direction within which the tip 32 of the second welded portion 18 can move due to this warping is d, then as long as the width a in the Y direction of the restricting portion 15 is d or greater (d≦a), the tip 32 can be prevented from coming into contact with the seal member 12 due to the warping.

[0027] Furthermore, by providing the restricting portion 15, when attaching the ink bag 14 to the case 20, the ink bag 14 is inserted into the recess 38 formed by the restricting portion 15. To ensure good operability, it is preferable that there be a gap between the Y-direction end 15a of the restricting portion 15 and the upper wall 35 that is at least larger than the size of the ink bag 14 in the thickness direction (Z direction). In other words, when the size of the ink bag 14 in the short side direction (Y direction) is b and the thickness (size in the Z direction) of the ink bag 14 is c, it is preferable that a≦bc.

[0028] As an example, the outer dimensions of the case 20 were 120 mm in the X direction, 85 mm in the Y direction, and 25 mm in the Z direction. The length a of the restricting portion 15 extending in the Y direction from the bottom wall 33 was set to 7 mm. The ink bag 14, when housed in the housing portion 31 of the case 20, had an X direction dimension of 110 mm, a Y direction dimension b of 55 mm, and a Z direction dimension c of 20 mm. The width of the first welded portion 17 of the ink bag 14 was set to 5 mm, and the width of the second welded portion 18 was set to 10 mm. In this case, d was 2 mm. Therefore, the width a of the restricting portion 15 was 2 mm≦a≦35 mm.

[0029] By providing the restricting portion 15 on the case 20, the following effects can be obtained.

[0030] When the second welded portion 18 of the ink bag 14 is folded and stored in the case 20 of the housing 11, the tip 32 of the second welded portion 18 hits the restricting portion 15, preventing it from reaching the seal member 12. This prevents damage to the seal member 12.

[0031] When the ink bag 14 is about to be deformed so as to be warped upward toward the seal member 12 due to consumption of ink in the ink bag 14, the part of the ink bag 14 near the second welded part 18 hits the restricting part 15, and the warping deformation can be suppressed.

[0032] By forming the restricting portion 15 into a planar shape extending in the XY direction, the seal member 12 can be welded. This allows for a shorter time than when the seal member 12 is welded only to the end surface 21 of the case 20. In comparison, the seal member 12 can be welded to the case 20 more firmly.

[0033] Although the first embodiment shows an example in which the restricting portion 15 is provided continuously over the entire area in the X direction along the second side 180, the restricting portion 15 may be provided partially in the X direction. Also, a plurality of restricting portions 15 may be provided along the second side 180 at intervals in the X direction.

[0034] Example 2 A second embodiment will be described. Detailed description of the same configuration as in the first embodiment will be omitted. Fig. 5 is a top view showing the internal structure of the cartridge 10 of the second embodiment. Note that the seal member 12 and the cover 19 are not shown in Fig. 5.

[0035] In the second embodiment, the restricting portion 15 has a first restricting portion 151 that protrudes in the Y direction from the Z-direction end of the bottom wall 33 toward the inside of the storage portion 31, as in the first embodiment. The restricting portion 15 further has second restricting portions 152 that protrude in the X direction from the Z-direction end of the first side wall 341 and the second side wall 342 toward the inside of the storage portion 31. The second restricting portion 152 is interposed between the second welded portion 18 and the seal member 12 to restrict movement of the second welded portion 18 in a direction toward the seal member 12. The second restricting portion 152 may be provided in the lower portion of the first side wall 341 and the second side wall 342 (parts of the side closer to the bottom wall 33 in the Y direction).

[0036] When the ink in the ink bag 14 is consumed, the ink bag 14 warps upward, which occurs when the entire ink bag 14 becomes rounded toward the outlet 16. According to the configuration of the second embodiment, it is possible to suppress movement not only of the side in the longitudinal direction (X direction) where the second welded portion 18 is located, but also of the side in the lateral direction (Y direction) where the gusset portion is located. Therefore, it is possible to more reliably suppress movement of the second welded portion 18, and more reliably suppress contact between the tip 32 of the second welded portion 18 and the seal member 12, which is caused by the warping of the ink bag 14 when the ink in the ink bag 14 is consumed.

[0037] Example 3 A third embodiment will now be described. Detailed descriptions of the same configurations as those of the first and second embodiments will be omitted. Figure 6 is a cross-sectional view showing the internal structure of the cartridge 10 of the third embodiment. The cross-sectional view of Figure 6 is taken at the same position as line AA in Figure 3. The cover 19 is not shown in Figure 6.

[0038] In the third embodiment, the restricting portion 15 has a first restricting portion 151 that protrudes from the Z-direction end of the lower wall 33 toward the inside of the storage portion 31, similar to the first embodiment. The restricting portion 15 further has a third restricting portion 153 that protrudes from a Y-direction end 151a of the first restricting portion 151 (the end on the upper wall 35 side (first inner wall surface side)) toward the inside of the storage portion 31 in the Z direction.

[0039] The presence of the third restricting portion 153 restricts movement of the tip 32 of the second welded portion 18 in the Y direction. This restricts the ink bag 14 from shrinking in the direction of the outlet 16 (Y direction) when the ink in the ink bag 14 decreases. This restricts the tip 32 of the second welded portion 18 from contacting the seal member 12 when the ink bag 14 is housed in the case 20, and also restricts the tip 32 from contacting the seal member 12 due to warping of the ink bag 14 when the ink in the ink bag 14 decreases.

[0040] Example 4 Example 4 will be described. Note that detailed description of the same configurations as in Examples 1, 2, and 3 will be omitted. Figure 7 is a cross-sectional view showing the internal structure of the cartridge 10 of Example 4. The cross-sectional view of Figure 7 is taken at the same position as line AA in Figure 3. Figure 8 is an exploded view of the cartridge 10 of Example 4. Note that the cover 19 is not shown in Figure 7.

[0041] In the fourth embodiment, the housing 11 of the cartridge 10 has a case 20 that is open on both sides in the Z direction, a first cover 191 that is a lid member that covers one opening of the case 20, and a second cover 192 that is a lid member that covers the other opening. The storage section 31 of the case 20 has a first opening 41 on one side in the thickness direction (Z direction) of the ink bag 14, and a second opening 42 on the other side. A first seal member 121 is welded to an end face 21 of the first opening 41, and a second seal member 122 is welded to an end face of the second opening 42, so that the storage section 31 for the ink bag 14, which is an airtight space, is formed in the case 20.

[0042] In the fourth embodiment, the restricting portion 15 has a first restricting portion 151 that protrudes in the Y direction from one end of the bottom wall 33 in the Z direction toward the inside of the storage portion 31, as in the first embodiment, and a fourth restricting portion 154 that protrudes in the Y direction from the other end toward the inside of the storage portion 31. As in the first embodiment, the first restricting portion 151 is interposed between the second welded portion 18 and the first seal member 121 to restrict movement of the second welded portion 18 in a direction toward the first seal member 121. The second restricting portion 152 is interposed between the second welded portion 18 and the second seal member 122 to restrict movement of the second welded portion 18 in a direction toward the second seal member 122. With this structure, in a configuration in which the case 20 is sealed with the first seal member 121 and the second seal member 122, the tip 32 can be prevented from coming into contact with the first seal member 121 and the second seal member 122 regardless of the direction in which the second welded portion 18 of the ink bag 14 is folded.

[0043] The disclosure of this embodiment includes the following configuration. (Configuration 1) a liquid containing bag formed by welding flexible members; a case having a storage portion capable of storing the liquid storage bag; a sealing member that seals the opening of the storage portion; a cartridge capable of supplying the liquid contained in the liquid containing bag to an outside, The storage portion has a first inner wall surface and a second inner wall surface facing the first inner wall surface, The liquid containing bag is a first welded portion formed on a first side facing the first inner wall surface; a second welded portion formed on a second side facing the second inner wall surface; an outlet provided in the first welded portion and capable of discharging liquid to the outside; and The outlet is fixed to the first inner wall surface, A cartridge characterized in that the second inner wall surface is provided with a regulating portion that protrudes toward the inside of the storage portion and is interposed between the second welded portion and the sealing member to regulate movement of the second welded portion in a direction toward the sealing member. (Configuration 2) 2. The cartridge according to configuration 1, wherein the liquid containing bag is contained in the containing section in a state where the second welded portion is bent from the second side toward the sealing member. (Configuration 3) The cartridge according to configuration 2, wherein the restricting portion protrudes to a position closer to the first inner wall surface than the position of the tip of the second welded portion bent toward the sealing member. (Configuration 4) The cartridge according to any one of configurations 1 to 3, wherein a gap larger than the size of the liquid containing bag in the thickness direction is provided between the first inner wall surface side end of the restricting portion and the first inner wall surface (Configuration 5). 5. The cartridge according to any one of configurations 1 to 4, wherein the regulating portion is provided continuously along the second side. (Configuration 6) Any of the configurations 1 to 4, wherein the restricting portion is a plurality of restricting portions provided at intervals along the second side. 1. The cartridge according to claim 1. (Configuration 7) the accommodating portion has a third inner wall surface extending in a direction intersecting the first inner wall surface and the second inner wall surface, and a fourth inner wall surface facing the third inner wall surface, A cartridge described in any one of configurations 1 to 6, wherein at least one of the third inner wall surface and the fourth inner wall surface is provided with a second regulating portion that protrudes toward the inside of the storage portion and is interposed between the second welded portion and the sealing member to regulate movement of the second welded portion in a direction toward the sealing member. (Configuration 8) 8. The cartridge according to configuration 7, wherein the second regulating portion is provided only on a portion of the cartridge that is closer to the second inner wall surface. (Configuration 9) The cartridge according to any one of configurations 1 to 6, wherein a third restricting portion that protrudes toward the inside of the containing portion is provided at an end of the restricting portion on the side of the first inner wall surface. (Configuration 10) 10. The cartridge according to any one of configurations 1 to 9, wherein the storage section has the opening on one side of the storage section in the thickness direction of the liquid storage bag. (Configuration 11) the container has a second opening on the other side of the container in the thickness direction of the liquid containing bag, a second seal member that seals the second opening; A cartridge as described in configuration 10, wherein the second inner wall surface is provided with a fourth regulating portion that protrudes toward the inside of the storage portion and is interposed between the second welded portion and the second seal member to regulate movement of the second welded portion in a direction toward the second seal member. [Explanation of symbols]

[0044] 10: cartridge, 12: sealing member, 14: ink bag, 15: restricting portion, 16: outlet port, 17: first welded portion, 18: second welded portion, 20: case, 33: bottom wall, 35: top wall, 170: first side, 180: second side

Claims

1. a liquid containing bag formed by welding flexible members; a case having a storage portion capable of storing the liquid storage bag; a sealing member that seals the opening of the storage portion; a cartridge capable of supplying the liquid contained in the liquid containing bag to an outside, the storage portion has a first inner wall surface and a second inner wall surface facing the first inner wall surface, The liquid containing bag is a first welded portion formed on a first side facing the first inner wall surface; a second welded portion formed on a second side facing the second inner wall surface; an outlet provided in the first welded portion and capable of discharging liquid to the outside; and the outlet is fixed to the first inner wall surface, A cartridge characterized in that the second inner wall surface is provided with a regulating portion that protrudes toward the inside of the storage portion and is interposed between the second welded portion and the sealing member to regulate movement of the second welded portion in a direction toward the sealing member.

2. The cartridge according to claim 1 , wherein the liquid containing bag is contained in the containing section in a state in which the second welded portion is bent from the second side toward the sealing member.

3. 3. The cartridge according to claim 2, wherein the restricting portion protrudes to a position closer to the first inner wall surface than the position of the tip of the second welded portion bent toward the sealing member.

4. A cartridge according to any one of claims 1 to 3, wherein a gap larger than the thickness of the liquid containing bag is present between the end of the regulating portion on the side of the first inner wall surface and the first inner wall surface.

5. 4. The cartridge according to claim 1, wherein the regulating portion is provided continuously along the second side.

6. 4. The cartridge according to claim 1, wherein a plurality of the regulating portions are provided at intervals along the second side.

7. the accommodation portion has a third inner wall surface extending in a direction intersecting the first inner wall surface and the second inner wall surface, and a fourth inner wall surface facing the third inner wall surface, A cartridge as described in any one of claims 1 to 3, wherein at least one of the third inner wall surface and the fourth inner wall surface is provided with a second regulating portion that protrudes toward the inside of the storage portion and is interposed between the second welded portion and the sealing member to regulate movement of the second welded portion in a direction toward the sealing member.

8. 8. A cartridge according to claim 7, wherein the second restricting portion is provided only on a portion of the cartridge that is closer to the second inner wall surface.

9. 4. The cartridge according to claim 1, wherein a third restricting portion is provided at an end of the restricting portion on the side of the first inner wall surface, the third restricting portion protruding toward the inside of the accommodating portion.

10. 4. The cartridge according to claim 1, wherein the container has the opening on one side in a thickness direction of the liquid containing bag.

11. The container has a second opening on the other side of the container in the thickness direction of the liquid containing bag. And, a second seal member that seals the second opening; A cartridge as described in claim 10, wherein the second inner wall surface is provided with a fourth regulating portion that protrudes toward the inside of the storage portion and is interposed between the second welded portion and the second seal member to regulate movement of the second welded portion in a direction toward the second seal member.

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