JP2013185638A - Seal member, and tank unit having the same - Google Patents

Abstract

To provide a sealing member capable of reliably keeping a tank airtight without increasing the number of parts, and a tank unit having the sealing member.
A seal member 101 includes an annular elastic member 110 and a U-shaped cross-section attached to the annular elastic member 110 so as to accommodate the inner edge portion of the annular elastic member 110 inside the entire circumference and to expose the outer edge portion. A ring-shaped sealing member 120. A pair of annular projecting portions 112 and 113 projecting away from each other in the axial direction D2 orthogonal to the radial direction D1 are integrally formed on the outer edge portion of the annular elastic member 110 over the entire circumference of the annular elastic member. Is provided.
[Selection] Figure 4

Description

  The present invention relates to, for example, a seal member that seals between a tank and an attachment body attached to the tank, and a tank unit including the seal member.

  A fuel tank that stores fuel such as high-pressure liquefied gas is provided with a liquid level sensor that detects the remaining amount in the fuel tank, and the fuel tank and the liquid level sensor constitute a tank unit. (For example, patent document 1).

  A conventional tank unit is shown in FIG. The tank unit 801 in FIG. 7 includes a liquid tank 802, a liquid level sensor 807, and a seal member 850.

  The liquid tank 802 is provided with a circular opening 802a communicating between the inside and the outside, and a flange receiving member 803 is provided so as to close the opening 802a. The flange receiving member 803 is made of, for example, a metal having high corrosion resistance such as stainless steel, and has a disk-like bottom wall 804 having the same diameter as the opening 802a and a peripheral wall erected from the periphery of the bottom wall 804. 805, and is formed in a substantially vessel shape having a circular shape in plan view. A circular through hole 804 a is formed in the center portion of the bottom wall 804. The flange receiving member 803 is disposed by being fitted into the opening 802a of the liquid tank 802, and the outer peripheral surface of the peripheral wall 805 is fixed to the periphery of the opening 802a by welding.

  The liquid level sensor 807 has a case 810 made of a metal having high corrosion resistance such as stainless steel, for example. The case 810 is provided with a case main body 808 formed in a substantially cylindrical shape, and a flange 809 provided at the upper end of the case main body 808. The case main body 808 is formed to have the same diameter as the circular through hole 804a, and the flange 809 is formed to have the same diameter as the inner diameter of the peripheral wall 805 of the flange receiving member 803.

  In the liquid level sensor 807, the case main body 808 is inserted into the circular through hole 804a, and the flange 809 is accommodated inside the peripheral wall 805, and fixed to the flange receiving member 803. When the liquid level sensor 807 is attached to the flange receiving member 803 in this way, an annular receiving space 806 for receiving a seal member 850 described later is formed between them.

  The seal member 850 is made of a rubber-like material having elasticity such as nitrile rubber (NBR), chloroprene rubber (CR), or silicone rubber. The seal member 850 has an elliptical cross section over the entire circumference. It is formed in an annular shape.

  As shown in FIG. 8, the seal member 850 is sandwiched between the bottom wall 804 of the flange receiving member 803 and the case 810 of the liquid level sensor 807, and elastically collapses in the storage space 806 up and down. It is housed in a deformed state. As a result, the seal member 850 seals the gap between the flange receiving member 803 and the liquid level sensor 807, and maintains the airtightness in the liquid tank 802.

  However, in the case where the liquid stored in the liquid tank 802 is corrosive to the material of the seal member 850 (including the property of the material such as alteration and solubility, and the property of changing the state), the seal is used. In the member 850, the liquid or the gas vaporized from the liquid may be touched and corroded. Therefore, in such a case, instead of the seal member 850, as shown in FIG. 9, for example, a cross section made of a synthetic resin material having corrosion resistance to the liquid such as polytetrafluoroethylene (PTFE). A U-shaped annular sealing member 863 is combined with an annular spring 861 composed of a metal spring housed inside the annular sealing member 863 in order to supplement the elasticity of the annular sealing member 863. A seal member 860 was used.

  According to the seal member 860, the annular sealing member 863 has corrosion resistance, and the annular spring 861 presses the annular sealing member 863 against the flange receiving member 803 and the liquid level sensor 807 from the inside. The air tightness in the liquid tank 802 was kept while preventing this.

JP 2000-292243 A

  However, when a high-pressure gas such as liquefied petroleum gas is stored in the liquid tank 802, the gas vaporized in the liquid tank 802 contacts the annular sealing member 863 at a high pressure. Therefore, there is a problem in that the airtightness in the liquid tank 802 cannot be maintained sufficiently. Moreover, in order to prevent such a problem, although the structure which adds another seal member on the outer side of the seal member 860 and raises airtightness can be considered, a number of parts will increase and manufacturing cost will increase. There was another problem.

  The present invention aims to solve this problem. That is, an object of the present invention is to provide a seal member that can reliably keep the airtightness of a tank without increasing the number of parts, and a tank unit having the seal member.

  In order to achieve the above object, the invention described in claim 1 is characterized in that an annular elastic member and one of the inner edge portion and the outer edge portion of the annular elastic member are accommodated inside the entire circumference and the other portion. An annular sealing member attached to the annular elastic member so as to expose the annular elastic member, the other portion of the annular elastic member is separated from each other in the axial direction. A pair of annular projecting portions projecting from each other are integrally provided over the entire circumference of the annular elastic member.

  The invention described in claim 2 is the invention described in claim 1, wherein the pair of annular protrusions are formed such that respective tips are outside the outer surface of the annular sealing member facing the axial direction. It is characterized by being.

  The invention described in claim 3 is characterized in that, in the invention described in claim 1 or 2, the annular sealing member has a corrosion resistance to a substance to be sealed. Is.

  In order to achieve the above object, the invention described in claim 4 includes a tank provided with an opening, an attachment body attached to the tank so as to close the opening, and the tank and the attachment. An annular seal member sandwiched so as to surround the opening between the body and the body, wherein the seal member comprises the seal member according to any one of claims 1 to 3. The annular sealing member is arranged so that the outer surface facing in the radial direction faces the space communicated in the tank, and the pair of annular projecting portions are clamped in the axial direction. It is a tank unit characterized by being made.

  According to a fifth aspect of the present invention, in the invention intended for the fourth aspect, an end surface of the other portion of the annular elastic member is disposed in contact with the tank or the attachment body. It is a feature.

  According to the invention described in claim 1, the annular elastic member and one of the inner edge portion and the outer edge portion of the annular elastic member are accommodated inside the entire circumference and the other portion is exposed. An annular sealing member having a U-shaped cross section attached to the annular elastic member, wherein the other portion of the annular elastic member protrudes away from each other in the axial direction. Since the part is integrally provided over the entire circumference of the annular elastic member, the seal member is, for example, crushed in the axial direction between the tank and the mounting body attached to the tank and sandwiched. The outer surfaces of the annular sealing member facing in the axial direction and the pair of annular protrusions abut against the tank and the mounting body, so that the annular elastic member is deformed by the stress of elastic deformation. In addition to urging from the side toward the outside, the pair of annular protrusions can be urged to the tank and the mounting body, thereby sealing the tank and the mounting body at two locations. . Therefore, since a double hermetic structure can be achieved with only one seal member, the gas that has permeated through the annular sealing member can be stopped by the pair of annular protrusions, so that the tank can be used without increasing the number of parts. Can be kept airtight.

  According to the invention described in claim 2, the pair of annular protrusions are formed with their respective ends being outside the outer surface facing the axial direction of the annular sealing member. It is reliably crushed and pinched, so that the airtightness of the tank can be maintained more reliably.

  According to the invention described in claim 3, since the annular sealing member has corrosion resistance to the substance to be sealed, it is possible to prevent the sealing member from being corroded. The airtightness of the can be kept more reliably.

  According to the invention described in claim 4, the seal member is configured by the seal member according to any one of claims 1 to 3, and the outer surface facing the radial direction in the annular sealing member is placed in the tank. The seal member is disposed so as to face the communicated space, and is sandwiched between the pair of annular protrusions so as to be crushed in the axial direction. Between the two outer surfaces facing the axial direction of the annular sealing member and the pair of annular protrusions abut against the tank and the mounting body. In addition to urging the annular sealing member from the inside to the outside due to the stress of elastic deformation, the pair of annular protrusions are urged to the tank and the attachment body, so that there is a gap between the tank and the attachment body. It can be sealed in two places. Therefore, since a double hermetic structure can be achieved with only one seal member, the gas that has permeated through the annular sealing member can be stopped by the pair of annular protrusions, so that the tank can be used without increasing the number of parts. Can be kept airtight.

  According to the fifth aspect of the present invention, since the end surface of the other part of the inner edge portion and the outer edge portion of the annular elastic member is disposed in contact with the tank or the mounting body, the radius of the annular sealing member When the outer surface facing the direction receives the pressure of the gas in the tank, the annular elastic member is crushed in the radial direction, so that the force that expands the axial elastic member in the axial direction works, and the axial direction of the annular sealing member is Both facing outer surfaces and the pair of annular projecting portions are more strongly brought into contact with the tank and the mounting body, so that the airtightness of the tank can be more reliably maintained.

1 is a front view (including a partial cross-sectional view) illustrating a tank unit according to an embodiment of the present invention. It is a top view of the liquid level sensor with which the tank unit of FIG. 1 is provided. It is a partial side view of the liquid level sensor of FIG. (A) is a perspective view which shows the sealing member of one Embodiment of this invention, (b) is sectional drawing which follows the XX line of (a). It is an expanded sectional view of accommodation space vicinity in the tank unit of FIG. (A) is a perspective view which shows the structure of the modification of the sealing member of FIG. 4, (b) is sectional drawing which follows the YY line of (a). It is a partial cross section figure of the conventional tank unit. It is an expanded sectional view of accommodation space vicinity in the tank unit of FIG. It is an expanded sectional view of accommodation space vicinity in the conventional tank unit of other composition.

  Hereinafter, a tank unit according to an embodiment of the present invention and a seal member included in the tank unit will be described with reference to FIGS. In the present embodiment, the tank unit stores liquefied petroleum gas.

  A tank unit (indicated by reference numeral 201 in the figure) of one embodiment of the present invention has a liquid tank 1 and a liquid level sensor 7 as an attachment body.

  The liquid tank 1 has a tank body 2 and a flange receiving member 3. The tank body 2 is made of, for example, a metal having corrosion resistance such as stainless steel, and is formed in a hollow box shape. A circular opening 2 b that communicates the inside and outside of the tank body 2 is provided in the upper wall 2 a of the tank body 2.

  The flange receiving member 3 is made of, for example, a metal having high corrosion resistance, such as stainless steel, and stands from a disc-shaped bottom wall 4 having the same diameter as the opening 2 b of the tank body 2 and a peripheral edge of the bottom wall 4. It is formed in a substantially vessel shape having a circular shape in plan view, provided with a peripheral wall 5 provided. A circular through hole 4c is formed in the central portion of the bottom wall 4 as an opening that penetrates the upper surface 4a and the lower surface 4b. The flange receiving member 3 is disposed by being fitted into the opening 2b of the tank body 2, and the outer peripheral surface of the peripheral wall 5 is fixed to the peripheral edge of the opening 2b by welding. Thereby, the space between the tank body 2 and the flange receiving member 3 is hermetically sealed. On the upper surface 4 a of the bottom wall 4 of the flange receiving member 3, a notch portion 4 d that is notched stepwise is formed over the entire circumference of the peripheral edge of the circular through hole 4 c.

  The liquid level sensor 7 includes a case 10, a pointer mechanism unit 30, a drive mechanism unit 50, and a float unit 70.

  The case 10 is made of, for example, a metal having corrosion resistance such as stainless steel, and the upper case portion 11 and the lower case portion 21 are fixed to each other by screws 12.

  The upper case portion 11 includes a substantially bottomed cylindrical upper portion 11a and a substantially cylindrical lower portion 11b having a smaller diameter than the upper portion 11a coaxially stacked on the bottom surface of the upper portion 11a. It has been. The outer diameter of the upper portion 11 a is the same as the inner diameter of the peripheral wall 5 of the flange receiving member 3. The outer diameter of the lower portion 11 b is the same as the diameter of the circular through hole 4 c in the bottom wall 4 of the flange receiving member 3. The upper portion 11 a constitutes a flange portion in the case 10.

  The upper case portion 11 is opened downward as an inner space of the lower portion 11b and a first accommodating chamber 14 that is a substantially cylindrical space opened upward as an inner space of the upper portion 11a. And a second storage chamber 15 which is a substantially cylindrical space. In the first storage chamber 14, a pointer mechanism unit 30 described later is stored. The second storage chamber 15 stores a drive magnet 52 described later.

  The lower case portion 21 is formed in a cylindrical shape that is long and has a smaller diameter than the lower portion 11b. Bearing portions 22 and 23 that pivotally support a shaft 51 of a drive mechanism portion 50 to be described later are provided inside the one end portion 21 a and the other end portion 21 b of the lower case portion 21. Further, a flange 24 is provided on one end 21 a of the lower case portion 21 over the entire outer peripheral surface. The outer diameter of the flange 24 is formed to be the same as the outer diameter of the one end portion 11 c of the upper case portion 11 (that is, the outer diameter of the lower portion 11 b of the upper case portion 11).

  The flange 24 is superimposed on the one end portion 11 c of the upper case portion 11, and is fixed to the one end portion 11 c with the screw 12. Thereby, the opening of the second storage chamber 15 is closed by the lower case portion 21.

  The pointer mechanism unit 30 includes a base 31, a pointer unit 35, and a cover 49.

  The base 31 is formed in a disk shape having the same outer diameter as that of the first storage chamber 14 using, for example, a synthetic resin. On the peripheral edge of the upper surface 31a of the base 31, an index 31c such as a scale line or a number indicated by a pointer unit 35 described later is formed. In addition, a pointer unit accommodation chamber 32 which is a substantially cylindrical space opened upward is formed at the center of the upper surface 31a of the base 31. A columnar convex portion 33 is formed on the bottom surface 32 a of the pointer unit accommodation chamber 32. The lower surface 31 b of the base 31 is formed in the same shape as the bottom surface of the first storage chamber 14, and when the base 31 is stored in the first storage chamber 14, the lower surface 31 b of the base 31 is changed to the first storage chamber 14. Closely overlaps the bottom. The base 31, the pointer unit accommodation chamber 32, and the convex portion 33 are arranged so as to be coaxial with each other. The base 31 is fixedly stored in the first storage chamber 14.

  The pointer unit 35 includes a pointer portion 36 and a driven magnet 41.

  The pointer portion 36 includes a pointer portion main body 37 and a pointer 40 that are integrally formed using, for example, a synthetic resin. The pointer unit body 37 is formed in a substantially bottomed cylindrical shape having an outer diameter slightly smaller than the diameter of the pointer unit accommodation chamber 32. A concave portion 38 in which the convex portion 33 of the pointer unit accommodation chamber 32 is rotatably fitted is provided at the central portion of the bottom wall 37 a of the pointer portion main body 37. Further, a bottom wall through hole 39 into which a later-described stop pin 47 is inserted is provided at the center of the bottom wall 37a. The pointer 40 is extended in a rod shape toward the radially outer side of the pointer portion main body 37 at the opening side end portion of the peripheral wall 37 b of the pointer portion main body 37.

  The driven magnet 41 is formed in a substantially cylindrical shape having the same outer diameter as the inner diameter of the pointer part main body 37, and is fixedly housed inside the pointer part main body 37. A magnet through hole 42 is provided in the axial direction at the center of the driven magnet 41. When the driven magnet 41 is accommodated in the pointer part main body 37, the magnet through hole 42 overlaps the bottom wall through hole 39 of the pointer part main body 37 and communicates with each other. The driven magnet 41 is magnetically coupled (magnetically coupled) to a drive magnet 52 described later.

  The pointer unit 35 is accommodated in the pointer unit accommodating chamber 32 such that the convex portion 33 is positioned inside the concave portion 38. Then, when the stop pin 47 is inserted into the magnet through hole 42 and the bottom wall through hole 39 and the tip of the stop pin 47 is fixed to the convex portion 33 of the base 31, the pointer unit 35 is attached to the base 31 in a freely rotatable manner. It is done. The pointer 40 of the pointer unit 35 is disposed on the upper surface 31a of the base 31, and indicates an index 31c corresponding to the rotation position (that is, the measurement amount). The pointer unit 35 is rotated in accordance with the rotation of the drive magnet 52 that is magnetically coupled to the driven magnet 41.

  The cover 49 is made of, for example, a transparent synthetic resin and is directed downward over the disk-shaped upper wall portion 49a having the same outer diameter as the first storage chamber 14 and the entire periphery of the upper wall portion 49a. The peripheral wall part 49b stood up and the shielding part 49c provided in the center part of the upper wall part 49a are provided. The cover 49 is housed in the first housing chamber 14 so that the front end of the peripheral wall portion 49b (that is, the end opposite to the upper wall portion 49a) faces the base 31. The cover 49 is made of light-shielding paint so that the indicator 31c formed on the upper surface 31a of the base 31 and the pointer 40 of the pointer unit 35 are visually recognized when viewed from above, and the pointer body 37 and the driven magnet 41 are not visually recognized. The formed shielding part 49c is provided in the central part of the upper wall part 49a.

  The drive mechanism unit 50 includes a shaft 51, a drive magnet 52, a first gear 53, and a second gear 54.

  The shaft 51 is formed in a long cylindrical shape using, for example, a metal having corrosion resistance such as stainless steel. The shaft 51 is pivotally supported on the inner side of the lower case portion 21 by the bearing portions 22 and 23 of the lower case portion 21 so as to be rotatable coaxially with the lower case portion 21. One end portion 51 a of the shaft 51 protrudes from one end portion 21 a of the lower case portion 21 and is positioned in the second storage chamber 15, and the other end portion 51 b protrudes from the other end portion 21 b of the lower case portion 21. It is positioned outside the case portion 21.

  The drive magnet 52 is formed in a disc shape (that is, a flat cylindrical shape), and is fixedly attached to one end portion 51 a of the shaft 51. The center of the drive magnet 52 is disposed on the rotation axis of the shaft 51.

  The first gear 53 is fixedly attached to the other end 51 b of the shaft 51. The rotation shaft of the first gear 53 is disposed on the rotation shaft of the shaft 51. The second gear 54 is extended to the other end 21 b of the lower case portion 21 so that the rotation axis thereof is orthogonal to the rotation axis of the first gear 53 (that is, the rotation axis of the shaft 51). The gear bearing 25 is pivotally supported by the gear bearing 25.

  The float unit 70 includes a float arm assembly 71 including a float arm 72 and a float 90, and a balancer 73.

  The float arm 72 is made of, for example, a metal having corrosion resistance such as stainless steel, and is formed in a substantially L-shaped cylindrical bar shape. One end portion 72a of the float arm 72 corresponds to a portion on the short side of the L shape, and the float 90 is attached thereto. The other end 72b of the float arm 72 corresponds to a portion near the tip of the long side of the L shape, and a balancer 73 described later is fixedly attached.

  For example, the float 90 is made of a material such as a synthetic resin or rubber that has corrosion resistance or penetration resistance to the liquid to be detected at the liquid level, and foams the material to create air (bubbles) inside. It is configured so as to be lighter than the specific gravity of the liquid to be detected at the liquid level by being solidified into a cylindrical shape in a contained state or formed into a hollow elliptical sphere shape. The float 90 is attached to one end 72 a of the float arm 72.

  In the present embodiment, the float 90 is formed of high-density polyethylene containing bubbles and solidified in a cylindrical shape, and a through hole (not shown) is provided along its axis. The float 90 is formed to be slightly shorter than the length of the L-shaped short side of the float arm 72. The float 90 is attached in a state of being sandwiched between the push nut 93 and the L-shaped bent portion 72 c of the float arm 72. Of course, the present invention is not limited to this, and the float 90 may be fixedly attached to the one end portion 72a by a fixing means such as an adhesive.

  The balancer 73 is made of, for example, a metal having corrosion resistance such as stainless steel, and is formed in a substantially cylindrical shape, and has a balancer through hole 74 through which the other end 72b of the float arm 72 is inserted along its axis. Is provided. The balancer 73 is fixed to the other end portion 72 b of the float arm 72 by brazing 77 at both ends thereof.

  The liquid level sensor 7 described above is attached to the liquid tank 1 described above. Then, when the float 90 of the liquid level sensor 7 is floated on the liquid level of the liquid in the liquid tank 1 and the float 90 is moved up and down as the liquid level rises and falls, this vertical movement is the second. The drive magnet 52 is rotated according to the amount of movement of the float 90, that is, the amount of liquid in the liquid tank 1, sequentially transmitted to the gear 54, the first gear 53 and the shaft 51. Then, the driven magnet 41 is rotated by the rotation of the drive magnet 52, and accordingly, the pointer portion 36 is also rotated, and the pointer 40 provided on the pointer portion 36 is moved to the liquid in the liquid tank 1. An index 31c corresponding to the amount is indicated.

  The liquid level sensor 7 includes a lower case 21 portion and a lower portion 11b of the upper case portion 11 that are inserted into the circular through hole 4c of the flange receiving member 3, and an upper portion 11a (that is, a flange portion) of the upper case portion 11. ) Is accommodated inside the peripheral wall 5 of the flange receiving member 3 and fixedly attached to the flange receiving member 3. As a result, the circular through hole 4 c is closed by the liquid level sensor 7. When the liquid level sensor 7 is attached to the flange receiving member 3 in this way, an annular housing space 6 for housing a seal member 101 described later is formed between them.

  As shown in FIGS. 4A and 4B, the seal member 101 is formed in an annular shape. The seal member 101 includes an annular elastic member 110 and an annular sealing member 120.

  The annular elastic member 110 is made of an elastic material such as nitrile rubber (NBR), chloroprene rubber (CR), or silicone rubber. The annular elastic member 110 includes an elastic member main body 111 and a pair of annular protrusions 112 and 113.

  The elastic member main body 111 is formed in an annular shape (that is, a flat annular shape) having a rectangular cross section in the radial direction over the entire circumference. An annular sealing member 120, which will be described later, is attached to the inner edge portion of the elastic member main body portion 111 (that is, one portion in the claims), and the outer edge portion of the elastic member main body portion 111 (that is, in the claims). A pair of annular protrusions 112 and 113 are integrally provided.

  The pair of annular projecting portions 112 and 113 are arranged on the outer edge portions of the flat surfaces 111a and 111b facing the axial direction D2 orthogonal to the radial direction D1 in the elastic member main body 111 and extend along the circumferential direction of the elastic member main body 111. It protrudes toward the axial direction D2. That is, a pair of annular projecting portions 112 and 113 projecting away from each other in the axial direction D2 are integrally provided on the outer edge portion of the elastic member main body portion 111 over the entire circumference of the elastic member main body portion 111. Yes.

  The pair of annular protrusions 112 and 113 has a circular cross section in the radial direction D1 over the entire circumference. Of course, the cross-sectional shape of the pair of annular protrusions 112 and 113 is not limited to this, and the shape is arbitrary as long as it does not contradict the object of the present invention, such as a rectangular cross-sectional shape or a wedge-shaped cross-section. .

  The pair of annular protrusions 112 and 113 are formed with their tips 112a and 113a outside the outer surfaces 122a and 123a facing the axial direction D2 of the annular sealing member 120 described later. In other words, the height in the axial direction D2 from the planes 111a and 111b in the pair of annular protrusions 112 and 113 is higher than the height in the axial direction D2 from the planes 111a and 111b in the outer surfaces 116a and 117a. Is formed. Of course, the height of the pair of annular protrusions 112 and 113 is not limited to this, and is sandwiched between the flange receiving member 3 and the liquid level sensor 7 unless it is contrary to the object of the present invention. The shape may be any shape as long as it is crushed in the axial direction D2 and seals between the flange receiving member 3 and the liquid level sensor 7.

  The annular sealing member 120 is made of a liquid (sealing material) that is harder than the annular elastic member 110 and contained in the liquid tank 1 such as a fluororesin material such as polytetrafluoroethylene (PTFE) or perfluoroalkoxyalkane (PFA). It is a substance to be stopped, and is composed of a synthetic resin material having corrosion resistance against liquefied petroleum gas in this embodiment.

  The annular sealing member 120 is a flat (that is, the axial direction D2 length is short) cylindrical bottom wall 121, and a pair of flanges standing on both ends of the bottom wall 121 in the radial direction D1 outward. Side wall portions 122 and 123 are integrally provided, and are formed in a U-shaped cross section over the entire circumference.

  In the annular sealing member 120, the outer surface 121a of the bottom wall 121 is directed inward in the radial direction D1, and the outer surfaces 122a, 123a of the pair of side walls 122, 123 are directed in the axial direction D2. . The distance between the pair of side wall portions 122 and 123 is the same as or slightly smaller than the thickness (the length in the axial direction D2) of the inner edge portion of the elastic member main body 111.

  The annular sealing member 120 accommodates the inner edge portion of the annular elastic member 110 inside the U-shape over the entire circumference so that the center O overlaps with the annular elastic member 110 and exposes the outer edge portion of the annular elastic member 110. Are attached to the annular elastic member 110.

  The seal member 101 is sandwiched between the bottom wall 4 of the flange receiving member 3 and the case 10 of the liquid level sensor 7 so as to surround the circular through hole 4c. It is housed in an elastically deformed state so as to collapse. Further, the sealing member 101 has the outer surface 121a of the bottom wall portion 121 of the annular sealing member 120 disposed closer to the inner side portion 6a in the radial direction D1 in the accommodating space 6, that is, the outer surface 121a of the bottom wall portion 121 is arranged. The liquid tank 1 is disposed so as to face the space communicated with the liquid tank 1. Further, the seal member 101 is arranged such that an end surface 111c facing the outside in the radial direction D1 at the outer edge portion of the annular elastic member 110 (that is, the elastic member main body 111) is in contact with the notch 4d of the flange receiving member 3. . Depending on the configuration of the storage space 6, the case 10 of the liquid level sensor 7 may be disposed facing the end surface 111c. In such a case, the end surface 111c contacts the case 10.

  Next, the effect | action which concerns on this invention in the tank unit 201 mentioned above is demonstrated.

  When the sealing member 101 is sandwiched between the bottom wall 4 of the flange receiving member 3 and the case 10 of the liquid level sensor 7 and is crushed vertically (in the axial direction D2), the seal member 101 is exposed to the outside of the annular sealing member 120 by stress. The surfaces 122a and 123a are urged (ie, pressed) into close contact with the bottom wall 4 and the case 10, respectively, and a pair of annular protrusions 112 and 113 are attached to the bottom wall 4 and the case 10, respectively. Since it is biased and is in close contact, the flange receiving member 3 and the liquid level sensor 7 can be sealed twice.

  Further, when the liquid in the liquid tank 1 is vaporized and the pressure in the liquid tank 1 is increased, the pressure is applied to the outer surface 121a of the annular sealing member 120 and the seal member 101 is pushed outward in the radial direction D1. Therefore, a force that expands in the axial direction D2 acts on the annular elastic member 110, and the outer surfaces 122a and 123a of the annular sealing member 120 are strongly urged by the bottom wall 4 and the case 10, respectively, so Further, the pair of annular protrusions 112 and 113 are urged strongly by the bottom wall 4 and the case 10 respectively. Thereby, between the flange receiving member 3 and the liquid level sensor 7 can be sealed more reliably.

  As described above, according to the present embodiment, the annular elastic member 110 and the cross section attached to the annular elastic member 110 so that the inner edge portion of the annular elastic member 110 is accommodated inside the entire circumference and the outer edge portion is exposed. In the sealing member 101 having the U-shaped annular sealing member 120, a pair of annular projecting portions 112 and 113 projecting away from each other in the axial direction D2 are provided on the outer edge portion of the annular elastic member 110. Since the annular elastic member 110 is integrally provided over the entire circumference, the seal member 101 is crushed and pinched in the axial direction D2 between the flange receiving member 3 and the liquid level sensor 7, Both outer surfaces 122a and 123a facing the axial direction D2 in the annular sealing member 120 and the pair of annular protrusions 112 and 113 are the flange receiving member 3 and the liquid surface. The annular elastic member 110 not only urges the annular sealing member 120 from the inner side toward the outer side due to the stress of elastic deformation, but also causes the pair of annular projecting portions 112 and 113 to move to the liquid tank 1. The liquid level sensor 7 is energized to seal the liquid tank 1 and the liquid level sensor 7 at two locations. Accordingly, since a double hermetic structure can be achieved with only one seal member 101, the gas that has permeated through the annular sealing member 120 can be stopped by the pair of annular protrusions 112 and 113, thereby increasing the number of parts. Therefore, the liquid tank 1 can be reliably kept airtight.

  In addition, since the pair of annular protrusions 112 and 113 are formed with their tips 112a and 113a outside the outer surfaces 122a and 123a facing the axial direction D2 of the annular sealing member 120, the pair of annular protrusions 112 and 113 are reliably crushed and pinched, so that the airtightness of the liquid tank 1 can be more reliably maintained.

  Further, since the annular sealing member 120 has corrosion resistance against the liquefied petroleum gas stored in the liquid tank 1, it is possible to prevent corrosion of the annular elastic member 110 and the annular sealing member 120, Therefore, the airtightness of the liquid tank 1 can be more reliably maintained.

  Further, since the end surface 111 c at the outer edge portion of the annular elastic member 110 is disposed in contact with the flange receiving member 3, the outer surface 115 a facing the inner side in the radial direction D1 of the annular sealing member 120 is the gas in the liquid tank 1. When the pressure is received, the annular elastic member 110 is crushed in the radial direction, so that a force that expands in the axial direction D2 acts on the annular elastic member 110, and both outer surfaces 122a of the annular sealing member 120 facing the axial direction D2 are applied. , 123a and the pair of annular projecting portions 112, 113 are brought into strong contact with the flange receiving member 3 and the liquid level sensor 7, so that the airtightness of the liquid tank 1 can be more reliably maintained.

  In the present embodiment described above, the seal member 101 is attached to the annular elastic member 110 so that the annular elastic member 110 and the inner edge portion of the annular elastic member 110 are accommodated inside the entire circumference and the outer edge portion is exposed. However, the present invention is not limited to this. For example, in the housing space in which the seal member is housed, in the case where the radially outer portion is in communication with the liquid tank, as shown in FIGS. 6 (a) and 6 (b), an annular elastic member 110A and the outer edge portion (corresponding to one portion in the claims) of the annular elastic member 110A are accommodated inside the entire circumference and the inner edge portion (corresponding to the other portion in the claims) is exposed. A seal member 101A having an annular sealing member 120A having a U-shaped cross section attached to the elastic member 110 is used. In this case, the pair of annular projecting portions 112A and 113A project from the inner edge portion of the elastic member main body portion 111A so as to be separated from each other in the axial direction D2, and are provided integrally with the elastic member main body portion 111A.

  In the above-described embodiment, the tank unit 201 that stores the liquefied petroleum gas has been described. However, the present invention is not limited to this, and other than the liquefied petroleum gas, highly corrosive chemicals such as sulfurous acid and ammonia are used. Alternatively, it may contain a high-pressure liquefied gas such as propane gas or butane gas, and the type of liquid contained in the liquid tank 1 is arbitrary. However, the annular sealing member 120 of the seal member 101 needs to be made of a material having corrosion resistance to the liquid stored in the liquid tank 1.

  Further, in the above-described embodiment, the liquid level sensor 7 is provided as the attachment body. However, the attachment body is not limited to this. For example, the attachment body includes an opening such as a liquid inlet of a liquid tank. As long as it does not contradict the purpose of the present invention, such as providing a cap for closing, the type of the attachment body is arbitrary.

  In the embodiment described above, the seal member 101 is formed in an annular shape. However, the present invention is not limited to this. For example, an annular shape surrounding the circular through-hole 4c, such as a polygonal annular shape. If it is (circular), the shape of the seal member 101 is arbitrary as long as it does not contradict the object of the present invention.

  In addition, embodiment mentioned above only showed the typical form of this invention, and this invention is not limited to embodiment. That is, various modifications can be made without departing from the scope of the present invention.

1 Liquid tank
2 Tank body 2b Opening 3 Flange receiving member 4c Circular through hole (opening)
6 Storage space 7 Liquid level sensor (mounting body)
DESCRIPTION OF SYMBOLS 10 Case 72 Float arm 73 Balancer 90 Float 101, 101A Seal member 110, 110A Annular elastic member 111, 111A Elastic member main body part 111c End surface of the annular elastic member 112, 112A Annular protrusion 112a Annular protrusion tip 113, 113A Annular protrusion Portion 113a Tip of annular protrusion 120, 120A Ring-shaped sealing member 121 Bottom wall 121a Outer surface of bottom wall (outer surface facing in the radial direction)
122, 123 Side wall 122a, 123a Outer surface of side wall 201 Tank unit D1 Radial direction D2 Axial direction

Claims (5)

A ring-shaped elastic member and a U-shaped cross-section attached to the ring-shaped elastic member so that one portion of the inner edge portion and the outer edge portion of the ring-shaped elastic member is accommodated inside the entire circumference and the other portion is exposed. In a sealing member having an annular sealing member,
A seal characterized in that a pair of annular projecting portions projecting away from each other in the axial direction are integrally provided on the other portion of the annular elastic member over the entire circumference of the annular elastic member. Element.   2. The seal member according to claim 1, wherein the pair of annular projecting portions are formed with their respective distal ends outward from an outer surface of the annular sealing member facing the axial direction.   The sealing member according to claim 1, wherein the annular sealing member has corrosion resistance against a substance to be sealed. A tank provided with an opening, an attachment attached to the tank so as to close the opening, and an annular shape sandwiched between the tank and the attachment so as to surround the opening A tank unit having a seal member,
The sealing member is
It is comprised with the sealing member as described in any one of Claims 1-3,
Arranged so that the radially outer surface of the annular sealing member faces the space communicated with the tank; and
A tank unit characterized in that the pair of annular projecting portions are sandwiched so as to be crushed in the axial direction.   The tank unit according to claim 4, wherein an end surface of the other portion of the annular elastic member is disposed in contact with the tank or the attachment body.

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