JP2010127201A - Urea replenishing part structure - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide urea replenishing part structure, replenishing urea into a urea tank, responding to a plurality of ways of replenishment. <P>SOLUTION: A lower male screw part 46 formed to a connector member 44 is screwed into a lower female screw part 42 formed to an inlet pipe body 34, and a connector member 44 is attached to the inlet pipe body 34. A female screw formed to a connected part of an exclusive bottle is screwed with a side male screw part 52 formed to the connector member 44. When the connected part is connected to an upper end part of the connector member 44, urea can be replenished from the exclusive bottle to the urea tank 14. When the connector member 44 is removed from the inlet pipe body 34, the urea can be replenished by inserting a nozzle for replenishing urea into the inlet pipe body 34. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a urea supply unit structure for supplying urea to a urea tank.

  As a urea replenishing portion structure for replenishing urea to a urea tank, in Patent Document 1, an adapter is fitted into a cylindrical pipe inlet so that a coupling portion of a refilling injector of the adapter and a coupling portion of a tank inlet adapter are connected. The structure is described.

By the way, the urea supply to the actual urea tank has various supply forms such as a case where the urea supply is performed from a dedicated bottle in addition to a case where the urea is supplied from a supply nozzle (so-called supply gun), a hose of a supply can, or the like. Therefore, it is desirable to be able to replenish urea corresponding to these plurality of replenishment modes.
Special table 2007-518636

  In view of the above facts, an object of the present invention is to obtain a urea replenishing portion structure capable of replenishing a urea tank with urea corresponding to a plurality of replenishing modes.

  In the first aspect of the present invention, an inlet pipe main body whose lower end is connected to a urea tank and a urea replenishing pipe member is inserted into an opening portion at the upper end so that urea can be replenished, and the upper end side of the inlet pipe main body And a connecting member that is removably attached to the connecting member for supplying urea, which is different from the pipe member, to the opening portion so that urea can be supplied.

  In this urea replenishing portion structure, a connecting member is detachably attached to the upper end side of the inlet pipe body. With the connecting member removed, urea can be supplied to the urea tank by inserting a urea supply pipe member into the opening at the upper end of the inlet pipe body.

  In a state where the connecting member is attached to the inlet pipe body, urea can be replenished by connecting a connected member for urea replenishment different from the pipe member to the opening of the connecting member. That is, urea can be supplied from different supply members depending on whether the connection member is not connected to the inlet pipe body or not.

  According to a second aspect of the present invention, in the first aspect of the present invention, the lid member that closes the opening portion of the inlet pipe main body or the connecting member, the lid member is provided, and is discharged from the urea tank. A filter member that adsorbs and decomposes ammonia gas; and a detection member that is provided on the lid member downstream of the filter member in the discharge direction of the ammonia gas and detects ph of the ammonia gas.

  This lid member closes the inlet pipe main body or the opening of the connecting member, thereby making it possible to suppress inadvertent urea leakage and gas diffusion in the urea tank.

  In addition, ammonia gas may be generated in the urea tank. This ammonia gas is adsorbed and decomposed by the filter member before being discharged outside through the inlet pipe body. Thereby, discharge | emission to the exterior of ammonia gas is suppressed.

  A detection member for detecting ph of the ammonia gas is provided on the lid member downstream of the filter member in the ammonia gas discharge direction. Therefore, when the filter member can no longer adsorb / decompose ammonia gas, or when the ability of the filter member decreases, this can be recognized by the change in ph of the detection member.

  According to a third aspect of the present invention, in the second aspect of the present invention, the pressure difference between the inside and the outside of the urea tank is provided in the lid member upstream of the filter member in the ammonia gas discharge direction. And an internal pressure adjusting valve that adjusts the internal pressure of the urea tank.

  The internal pressure adjusting valve is closed when the pressure difference between the inside and outside of the urea tank is within a predetermined range, and suppresses the discharge of ammonia gas. When the internal pressure adjusting valve is opened, the internal pressure of the urea tank can be adjusted. Since the internal pressure adjusting valve is provided upstream of the filter member in the ammonia gas discharge direction, the ammonia gas that has passed through the internal pressure adjusting valve when the valve is opened can be adsorbed and decomposed by the filter member.

  Since the present invention has the above-described configuration, urea can be supplied to the urea tank corresponding to a plurality of supply modes.

  FIG. 1 shows a urea replenishing part structure 32 according to an embodiment of the present invention. FIG. 2 schematically shows the overall configuration of the urea tank system 12 to which the urea replenishing portion structure 32 is applied.

  The urea tank system 12 has a urea tank 14 that can store urea. The urea replenishing portion structure 32 of the present embodiment has a urea replenishing nozzle 16 (see FIG. 5), a replenishing can bellows hose 18 (see FIG. 6, these nozzles 16 and the bellows hose 18) with respect to the urea tank 14. In addition to the “urea replenishment tube member” according to the present invention, the connected portion 20 of the dedicated bottle (see FIG. 9) is connected to the “urea replenishment portion 20” according to the present invention. It corresponds to an example of “connected member”), and urea can be replenished. The diameters of the urea replenishing nozzle 16 and the replenishing can bellows hose 18 are standardized. In addition, the connected portion 20 of the dedicated bottle also has a standardized outer diameter, inner diameter, and shape of a female screw 54 described later. Urea accommodated in the urea tank 14 is pumped up in the urea supply pipe 24 by the urea transfer pump 22, further injected into the exhaust pipe 30 by the urea injection valve 25, and sent to the SCR catalyst 26. The SCR catalyst 26 purifies nitrogen oxides in the exhaust gas sent from the engine 28 through the exhaust pipe 30.

  The urea tank 14 is connected to the lower end side of a substantially cylindrical inlet pipe body 34. On the upper end side of the inlet pipe main body 34, as shown in FIG. 1, an enlarged diameter portion 36 having a diameter larger than that of the lower end portion side is formed. As shown in FIG. 5, the inner diameter of the enlarged diameter portion 36 is an inner diameter that allows the urea replenishing nozzle 16 to be inserted from the insertion hole 38 (opening portion) at the upper end. Further, as shown in FIG. The inside diameter of the bellows hose 18 of the urea replenishing can can be inserted. At this time, a gap is formed between the inner peripheral surface of the enlarged diameter portion 36 of the inlet pipe main body 34 and the outer peripheral surface of the nozzle 16 or the bellows hose 18, so that the gas in the urea tank 14 is externally supplied when urea is supplied. It is possible to escape.

  In the insertion hole 38 of the inlet pipe main body 34, a gradually increasing portion 40 having an inner diameter gradually increasing toward the upper end is formed to facilitate insertion of the nozzle 16 and the bellows hose 18. Further, a lower female screw portion 42 in which the diameter of the cylindrical shape of the inlet pipe body 34 is locally reduced is formed in the enlarged diameter portion 36 at a position on the lower end side by a predetermined distance from the insertion hole 38.

  A connector member 44 is partially inserted into the insertion hole 38 of the inlet pipe main body 34 and is detachably attached. The connector member 44 is formed in a substantially cylindrical shape and has an upper end and a lower end opened. A lower male screw portion 46 that is screwed into the lower female screw portion 42 is formed at the lower end portion.

  An annular flange 48 is formed radially outward from a substantially middle portion in the longitudinal direction of the connector member 44, and an O-ring 50 is attached to the lower surface side of the flange 48. When the connector member 44 is inserted into the insertion hole 38 of the inlet pipe body 34 and screwed in, the O-ring 50 comes into close contact with the gradually increasing portion 40 to limit the insertion range of the connector member 44 to a certain level. A gap with the inlet pipe body 34 is closed.

  An upper male screw portion 52 is formed at the upper end portion of the connector member 44. As shown in FIG. 9, the upper male screw portion 52 is screwed with a female screw 54 formed on the connected portion 20 of the dedicated bottle. When the connected portion 20 of the dedicated bottle is thus connected to the upper end portion (opening portion) of the connector member 44, urea can be supplied from the dedicated bottle to the urea tank 14 through the connector member 44 and the inlet pipe body 34. It becomes.

  As shown in FIG. 1, the handle member 56 is put on the connector member 44 when urea is not supplied to the urea tank 14. The handle member 56 includes a disc portion 58 that covers the upper end of the connector member 44, a cylindrical portion 60 that extends downward from the periphery of the disc portion 58, and a convex portion 56 </ b> T at the upper end of the disc portion 58. The disk portion 58 and the convex portion 56T close the opening at the upper end of the connector member 44.

  On the inner peripheral surface of the disc portion 58, a female screw 62 that is screwed into the upper male screw portion 52 of the connector member 44 is formed. When the female screw 62 is screwed into the upper male screw portion 52 and the handle member 56 is screwed into the connector member 44, the disk portion 58 is positioned at the upper end of the connector member 44. At this time, the length of the cylindrical portion 60 is determined so that the cylindrical portion 60 does not inadvertently contact the flange 48 of the connector member 44. Further, the loosening torque when loosening the female screw 62 from the upper male screw portion 52 is set smaller than the loosening torque when loosening the lower male screw portion 46 from the lower female screw portion 42.

  The center of the disc portion 58 of the handle member 56 is opened in a circular shape, and the filter member 64 is attached to the inside of the opening. Further, an internal pressure adjusting valve body 66 is provided below the filter member 64 and is integrated with the filter member 64. The internal pressure adjusting valve body 66 is a so-called two-way valve body in which a positive pressure valve 68 and a negative pressure valve 70 are arranged in parallel as viewed in the gas flow direction inside and outside the urea tank 14. When the inside of the urea tank 14 becomes a high pressure (positive pressure) that is a predetermined value or more relative to the outside, the positive pressure valve 68 is opened, and conversely, the inside of the urea tank 14 is relative to the outside. When a low pressure (negative pressure) exceeding a predetermined value is reached, the negative pressure valve 70 is opened. By opening the positive pressure valve 68 or the negative pressure valve 70, it is possible to suppress the discharge of ammonia gas while maintaining the internal pressure of the urea tank 14 within a predetermined range. The valve opening pressures of the positive pressure valve 68 and the negative pressure valve 70 are not particularly limited, but are set to about 3 to 5 kPa, for example.

  A photocatalytic filter 72 is accommodated inside the filter member 64. For example, when the positive pressure valve 68 is opened, the photocatalytic filter 72 adsorbs and decomposes the ammonia gas passing through the photocatalytic filter 72 to suppress the discharge of the ammonia gas to the outside. The upper plate 74 of the filter member 64 and the convex portion 56T at the upper end of the handle member 56 are formed of a transparent member in the present embodiment, and are configured to transmit external light and reach the photocatalytic filter 72.

  A ph test paper 76 is attached to the upper surface of the upper plate 74 (transparent portion) of the handle member 56 so that a change in ph due to ammonia gas can be visually recognized by a predetermined color reaction. That is, when ammonia gas passes through the filter member 64 due to a decrease in the adsorption / decomposition capability of the photocatalytic filter 72, the color of the ph test paper 76 changes. As a result, it is possible to visually know that the ammonia gas has passed through the filter member 64, in other words, that the decomposition capability of the photocatalytic filter 72 has decreased. As the ph test paper 76, a litmus test paper can be used. Moreover, it is not limited to the thing made from paper, The structure which apply | coats ph test liquid may be sufficient. A phenolphthalein solution can be used as the ph test solution. Furthermore, as a photocatalyst, titanium oxide generally used in applications such as deodorization is suitable, but is not limited thereto.

  In the present embodiment, as shown in FIG. 10, the upper plate 74 of the filter member 64 is formed with a fitting claw 78 that partially projects outward in the radial direction. A fitting recessed portion 80 into which the fitting claw 78 can be fitted is formed in the opening portion of 58. The filter member 64 can be easily attached to and detached from the handle member 56 by a so-called snap fit by fitting the fitting claw 78 into the fitting recessed portion 80 while slightly bending it. Instead of such a snap fit, the filter member 64 may be detachably attached to the handle member 56 by screw fastening.

  An O-ring 82 is attached to the outer periphery of the filter member 64. The O-ring 82 is in close contact with the connector member 44 when the handle member 56 is attached, and closes the gap between the handle member 56 and the connector member 44.

  A lock member 84 is attached to the outside of the handle member 56. The lock member 84 includes an annular ring portion 86 that surrounds the cylindrical portion 60 of the handle member 56, and a plurality of engagement legs (four equally in the circumferential direction in this embodiment) extending downward from the ring portion 86. 88. The lock member 84 does not rotate relative to the handle member 56 in the circumferential direction of the handle member 56, and slides relative to the handle member 56 in the longitudinal direction of the handle member 56.

  In the flange 48 of the connector member 44, engaged holes 90 through which the engagement legs 88 can be inserted are formed at positions corresponding to the engagement legs 88. When the locking member 84 slides and moves downward, the engaging leg 88 is inserted into the engaged hole 90 and engaged (becomes locked). Therefore, when the handle member 56 is rotated in this state, the connector member 44 also rotates together. On the other hand, when the lock member 84 moves upward and comes out of the engaged hole 90 (becomes unlocked), the handle member 56 can rotate relative to the connector member 44.

  A tether member 92 is attached to the outer periphery of the lock member 84. The tether member 92 includes an annular reel portion 94, a tether body 96 wound and unwound by the reel portion 94, and a flange 98 at the tip of the tether body 96. A spring (not shown) is accommodated in the reel portion 94, and a predetermined winding force is applied to the tether body 96. With the connector member 44 removed from the inlet pipe main body 34, the tether main body 96 is unwound by a necessary length against the winding force, and the hook 98 is hooked on a predetermined latching portion (such as a hanger). Can be done.

  Next, the operation of the urea replenishing part structure 32 of this embodiment will be described.

  In the present embodiment, when urea is replenished to the urea tank 14, urea is replenished from the urea replenishing nozzle 16 or the bellows hose 18 of the replenishing can, and urea is replenished from the connected portion 20 of the dedicated bottle. Both cases can be handled.

  First, the case where urea is replenished from the urea replenishing nozzle 16 and the bellows hose 18 of the replenishing can will be described. In this case, as shown in FIG. 1, the lock member 84 is moved downward to be in the locked state. Here, when the handle member 56 is rotated, the connector member 44 is also rotated integrally. Therefore, the lower male screw portion 46 of the connector member 44 is loosened from the lower female screw portion 42 of the inlet pipe body 34, as shown in FIG. In addition, the connector member 44 can be removed from the inlet pipe body 34.

  Thus, when the connector member 44 is removed from the inlet pipe main body 34, as shown in FIG. 5, the insertion hole 38 and the enlarged diameter portion 36 having a relatively large inner diameter appear. It is possible to insert the nozzle 16 into 36 or insert the bellows hose 18 as shown in FIG. 6, and urea can be replenished to the urea tank 14. In particular, in the present embodiment, the enlarged diameter portion 36 of the inlet pipe body 34 has an inner diameter that creates a sufficient gap between the inner peripheral surface thereof and the outer peripheral surface of the nozzle 16 or the bellows hose 18. By supplying the gas in the urea tank 14 to the outside during replenishment, smooth urea replenishment is possible. For example, the flow rate of urea discharged from the nozzle 16 is faster than the flow rate of urea discharged from the bellows hose 18. Replacement is possible. At this time, the removed handle member 56 and connector member 44 can hook the hook piece 98 of the tether member 92 on the above-described hanger or the like.

  Next, the case where urea is replenished from the connected portion 20 of the dedicated bottle will be described. In this case, as shown in FIG. 7, first, the locking member 84 is moved upward to remove the engaging leg 88 from the engaged hole 90 to be in the unlocked state. When the handle member 56 is rotated and loosened in this unlocked state, the loosening torque when the female screw 62 is loosened from the upper male screw portion 52 is loosened when the lower male screw portion 46 is loosened from the lower female screw portion 42. Since it is set smaller than the torque, the handle member 56 rotates relative to the connector member 44 and loosens. As a result, as shown in FIG. 8, only the handle member 56 can be detached from the connector member 44 while maintaining the state where the connector member 44 is connected to the inlet pipe body 34.

  In this state, as shown in FIG. 9, the connected portion 20 is connected to the connector member 44 by screwing the female screw 54 formed on the connected portion 20 of the dedicated bottle into the upper male screw portion 52 of the connector member 44. It is possible to connect directly and supply urea from the dedicated bottle to the urea tank 14. Also at this time, the removed handle member 56 can hook the hook 98 of the tether member 92 on the hanger described above.

  When the urea supply to the urea tank 14 is finished, the handle member 56 is attached to the connector member 44 as shown in FIG. Thereby, the connector member 44 is attached to the inlet pipe body 34, and the handle member 56 is further attached to the connector member 44. As a result, the upper end of the connector member 44, that is, the upper end of the inlet pipe body 34 is closed (normal state). Therefore, inadvertent leakage of urea in the urea tank 14 and external discharge of gas in the urea tank 14 are suppressed.

  Although the internal pressure of the urea tank 14 varies depending on the temperature or the like, the negative pressure valve 70 and the positive pressure valve 68 constituting the internal pressure adjusting valve body 66 are opened at a predetermined valve opening pressure. That is, the negative pressure valve 70 and the positive pressure valve 68 are not opened when the change in the internal pressure of the urea tank 14 is within a predetermined range. Although ammonia gas may exist in the urea tank 14, inadvertent discharge of the ammonia gas to the atmosphere is suppressed.

  When the internal pressure of the urea tank 14 becomes lower than the external pressure by a predetermined value or more (becomes negative pressure), the negative pressure valve 70 is opened and external gas (air) flows into the urea tank 14. An excessive decrease in the internal pressure of the urea tank 14 can be suppressed.

  When the internal pressure of the urea tank 14 becomes higher than the external pressure by a predetermined value or more (positive pressure), the positive pressure valve 68 is opened and the internal gas is discharged from the urea tank 14. An excessive increase in internal pressure can be suppressed. The discharged gas may include ammonia gas in which a part of urea is hydrolyzed in the urea tank 14, but this ammonia gas is adsorbed and decomposed by the photocatalytic filter 72 of the filter member 64. Ammonia gas emission is suppressed.

  In particular, in this embodiment, the upper plate 74 of the filter member 64 and the convex portion 56T at the upper end of the handle member 56 are made transparent, so that external light reliably reaches the photocatalyst filter 72 and is adsorbed and Degradation can be accelerated.

  Note that sunlight is the most common light to irradiate the photocatalyst filter 72. For example, external light such as sunlight entering from a gap between outer panel panels of the vehicle body can be used. However, when the position of the handle member 56 is a position entering the inside of the vehicle body from the outer panel of the vehicle body, a sufficient amount of light may not reach the photocatalytic filter 72 in some cases. In this case, the position of the handle member 56 may be set so that light from a light emitting member (for example, a headlamp) attached to the vehicle body is irradiated to the photocatalytic filter 72. Further, a dedicated light emitting member for irradiating the photocatalytic filter 72 with light may be provided.

  As the photocatalytic filter 72 is used, the adsorption / decomposition capability of ammonia gas decreases. At this time, if ammonia gas is slightly discharged to the outside of the filter member 64, the ph of the ph test paper 76 rises and a predetermined color reaction occurs. In this way, by visually knowing the change in the color of the ph test paper 76, it becomes a measure of the replacement time of the filter member 64.

  As shown in FIG. 10, the filter member 64 is fitted so as to be detachable from the handle member 56 by so-called snap fit, so that the filter member 64 can be easily replaced. Of course, the filter member 64 is not limited to the snap fit. For example, even when the filter member 64 is detachably attached to the handle member 56 by screw fastening as described above, the filter member 64 can be easily replaced. is there.

  In the above description, a structure in which the connector member 44 is connected to the upper end of the inlet pipe main body 34 and the handle member 56 is attached to the connector member 44 in the normal state, that is, in the state where the urea tank 14 is not replenished with urea. As described above, for example, in a normal state, the handle member 56 is attached to the upper end of the inlet pipe main body 34 (without attaching the connector member 44) to close the insertion hole 38, and the handle member 56 is removed when urea is supplied. But you can.

  As described above, in the configuration in which the connector member 44 is not attached in the normal state, when the handle member 56 is removed, the insertion hole 38 and the enlarged diameter portion 36 having a relatively large inner diameter appear. It becomes possible to insert the nozzle 16 into 36 or the bellows hose 18. Further, after the handle member 56 is removed, the connector member 44 is attached to the upper end of the inlet pipe main body 34, so that the female screw 54 formed in the connected portion 20 of the dedicated bottle is replaced with the upper male screw portion of the connector member 44. It is possible to replenish urea from the dedicated bottle to the urea tank 14 by screwing into 52 and connecting the connected portion 20 directly to the connector member 44. Generally, when the inner diameter of the connected portion 20 is not sufficiently large with respect to the outer diameter of the nozzle 16, in the configuration in which the connector member 44 is not used as in the present embodiment, both the nozzle 16 and the connected portion 20 are provided. Although it is difficult to provide a corresponding supply unit, in this embodiment, urea can be reliably supplied from both.

  In this configuration, since the connector member 44 is not normally connected to the inlet pipe main body 34, the connector member 44 is stored inside the vehicle body, for example, in the vicinity of the inlet pipe main body 34 or in an in-vehicle tool space. It is preferable to keep it.

  Further, in this configuration, the connector member 44 is not attached to the inlet pipe body 34 in a normal state, but even in that case, the handle member 56 has an insertion hole 38 (opening portion) of the inlet pipe body 34. Can be blocked. Further, since the filter member 64 and the ph test paper 76 are provided on the handle member 56, the ammonia gas can be adsorbed and decomposed by the filter member 64 (photocatalytic filter 72), and the photocatalytic filter 72 is decomposed. It is possible to visually recognize that the ability has been reduced by the color change of the ph test paper 76.

  In the above description, the structure in which the connector member 44 is attached to the inlet pipe main body 34 is a screw structure in which the lower male screw portion 42 is screwed into the lower female screw portion 42. However, the attachment structure is not limited to this. For example, the connector member 44 may be provided with a locking projection, and the inlet pipe body 34 may have a locking recess in which the locking projection is locked.

  Further, in the above example, the connected portion 20 of the dedicated bottle is assumed as the connected member, and the upper male screw portion 52 corresponding to the female screw 54 formed in the connected portion 20 is formed in the connector member 44. However, the structure for connecting the connected member to the connector member 44 may be a desired structure corresponding to the configuration of the connected member. A new connector member different from this may be added to the connector member 44 so that another connected member can be connected.

It is sectional drawing which shows the urea replenishment part structure of one Embodiment of this invention in the cross section along the longitudinal direction of an inlet pipe main body. 1 is a schematic diagram illustrating an overall configuration of a urea tank system to which a urea replenishing unit structure according to an embodiment of the present invention is applied. It is the III-III sectional view taken on the line of FIG. 1 which shows the urea supply part structure of one Embodiment of this invention. It is sectional drawing which shows the urea supply part structure of one Embodiment of this invention in the state which removed the connector member. It is sectional drawing which shows the urea replenishment part structure of one Embodiment of this invention in the urea replenishment state from a nozzle. It is sectional drawing which shows the urea replenishment part structure of one Embodiment of this invention in the urea replenishment state from a bellows hose. It is sectional drawing which shows the urea supply part structure of one Embodiment of this invention in the unlocked state of a lock member. It is sectional drawing which shows the urea replenishment part structure of one Embodiment of this invention in the state which removed the handle member. It is sectional drawing which shows the urea replenishment part structure of one Embodiment of this invention in the urea replenishment state from the to-be-connected part of an exclusive bottle. It is sectional drawing which shows the urea replenishment part structure of one Embodiment of this invention in the state which removed the filter member from the handle member.

Explanation of symbols

12 Urea tank system 14 Urea tank 16 Nozzle (tube member for urea supply)
18 Bellows hose (tube member for urea supply)
20 Connected part (Connected member for urea supply)
22 Urea transfer pump 24 Urea supply pipe 25 Urea injection valve 26 SCR catalyst 28 Engine 30 Exhaust pipe 32 Urea supply part structure 34 Inlet pipe main body 36 Diameter expansion part 38 Insertion hole 42 Lower female screw part 44 Connector member (connection member)
46 Lower male screw portion 52 Upper male screw portion 54 Female screw 56 Handle member (lid member)
62 Female thread 64 Filter member 66 Internal pressure adjusting valve body (Internal pressure adjusting valve)
72 Photocatalyst filter 76 ph test paper (detection member)
78 Fitting claw 80 Fitted recess 84 Lock member 88 Engagement leg 90 Engaged hole 92 Tether member

Claims (3)

An inlet pipe body whose lower end is connected to a urea tank and urea is replenished by inserting a pipe member for urea replenishment into the opening at the upper end; and
A connecting member that is detachably attached to the upper end side of the inlet pipe body, and that is connected to a connecting member for urea replenishment different from the pipe member to the opening portion, so that urea can be replenished,
Urea replenishment part structure having A lid member that closes an opening portion of the inlet pipe body or the connection member;
A filter member provided on the lid member for adsorbing and decomposing ammonia gas discharged from the urea tank;
A detection member that is provided on the lid member on the downstream side in the discharge direction of the ammonia gas from the filter member, and is provided to detect ph of the ammonia gas;
The urea replenishing part structure according to claim 1, wherein: An internal pressure adjusting valve provided on the lid member on the upstream side in the discharge direction of the ammonia gas from the filter member, and opening the valve according to the pressure difference between the inside and outside of the urea tank to adjust the internal pressure of the urea tank;
The urea replenishing part structure according to claim 2 having

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