JP5970435B2 - Urea water tank - Google Patents

Description

  The present invention relates to a urea water tank, and more particularly to a urea water tank provided with a water level gauge that allows the stored water level to be visually observed from the outside.

  A vehicle equipped with a diesel engine is provided with a tank for storing urea water in order to purify the exhaust of the engine.

  This tank has a thawing pipe inside because urea water may freeze when used in a cryogenic region. Further, a level gauge (water level meter) for confirming the amount of liquid is provided on the outer surface of the tank (see, for example, Patent Document 1).

JP 2006-200521 (paragraphs 0014, 0016, FIG. 1, FIG. 3)

  When such a prior art tank is used in a cryogenic region, the level gauge provided on the outer surface of the tank is exposed to the outside air, so the heat from the thawing pipe that is at a certain distance from the level gauge The urea water frozen inside the level gauge may not be thawed. In such a case, the level gauge cannot perform its function.

  The present invention has been made based on the above matters, and an object thereof is to provide a urea water tank capable of thawing the urea water frozen inside the water level gauge.

In order to achieve the above object, the first invention is a urea water tank provided with a water level gauge on the outer surface of the tank body, which allows the stored urea water level to be visually observed from the outside, and is disposed in the tank body. A metal pipe for heating the urea water, a metal mounting member provided at an end of the water level meter for attaching the water level meter to a side surface of the tank main body, and one end located in the tank main body. The metal heat transfer member provided on the side surface portion of the tank body so that the other end is connected to the mounting member, and the metal member connecting the one end of the heat transfer member and the metal pipe for heating. The mounting member has a flow passage for urea water circulation in the central portion thereof, and at least two of the heat transfer members provided on the side surface portion of the tank body are connected to the left and right portions thereof, respectively. It is characterized by having a mounting portion .

The second invention is characterized in that, in the first invention, a metal member covering the outer peripheral surface is further provided at the lower end of the water level gauge.

Furthermore, a third invention is characterized in that, in the first or second invention, the metal pipe for heating is disposed along the bottom surface portion and the side surface portion in the tank body. .

  According to the present invention, the metal attachment member provided at the end of the water level meter is connected to the metal pipe for heating in the tank body via the metal heat transfer member provided in the tank body. Heat for heating can be efficiently transmitted to the mounting member, and the urea water frozen in the water level meter can be thawed. As a result, even when used in a cryogenic region where the urea water is frozen, the water level of the urea water in the tank body can be confirmed by the water level gauge.

1 is a side view of a hydraulic excavator to which a first embodiment of a urea water tank of the present invention is applied. It is a front view which shows 1st Embodiment of the urea water tank of this invention mounted in the hydraulic shovel shown in FIG. It is the vertical side view which looked at 1st Embodiment of the urea water tank of this invention shown in FIG. 2 from the III-III arrow. It is an enlarged front view which shows the water level meter which comprises 1st Embodiment of the urea water tank of this invention shown in FIG. It is the longitudinal cross-sectional view which looked at the water level meter which comprises 1st Embodiment of the urea water tank of this invention shown in FIG. 4 from the VV arrow. It is the longitudinal cross-sectional view which looked at the water level meter which comprises 1st Embodiment of the urea water tank of this invention shown in FIG. 4 from the VI-VI arrow. It is the cross-sectional view which looked at the water level meter which comprises 1st Embodiment of the urea water tank of this invention shown in FIG. 4 from the VII-VII arrow. It is an enlarged front view which shows the water level meter which comprises 2nd Embodiment of the urea water tank of this invention. It is the longitudinal cross-sectional view which looked at the water level meter which comprises 2nd Embodiment of the urea water tank of this invention shown in FIG. 8 from the IX-IX arrow. It is the cross-sectional view which looked at the water level meter which comprises 2nd Embodiment of the urea water tank of this invention shown in FIG. 8 from the XX arrow.

Hereinafter, embodiments of a urea water tank of the present invention will be described with reference to the drawings.
1 to 7 show a first embodiment of a urea water tank according to the present invention. FIG. 1 is a side view of a hydraulic excavator to which the first embodiment of the urea water tank according to the present invention is applied. 2 is a front view showing a first embodiment of the urea water tank of the present invention mounted on the hydraulic excavator shown in FIG. 1, and FIG. 3 is a first embodiment of the urea water tank of the present invention shown in FIG. Fig. 4 is an enlarged front view showing the water level meter constituting the first embodiment of the urea water tank of the present invention shown in Fig. 2, and Fig. 5 is Fig. 4. FIG. 6 is a longitudinal sectional view of a water level meter constituting the first embodiment of the urea water tank of the present invention shown in the V-V direction, and FIG. FIG. 7 shows a first embodiment of the urea water tank of the present invention shown in FIG. 4. The water level gauge is a cross-sectional view seen from VII-VII arrow.

  In FIG. 1, a hydraulic excavator 1 includes a traveling body 2, a revolving body 3 that is turnably mounted on the traveling body 2, and a work front 4 that is installed on the front side of the revolving body 3 so as to be able to be raised and lowered. .

  The traveling body 2 is rotatably supported on the track frame 5, the drive wheel 6 rotatably supported on the rear end (left side in FIG. 1) of the track frame 5, and the front end (right side in FIG. 1) of the track frame 5. And a crawler belt 8 wound around the driving wheel 6 and the idler wheel 7.

  The work front 4 includes a boom 9 attached to the revolving body 3 so as to be able to be lifted and lowered by a boom cylinder 9a, an arm 10 attached to the boom 9 so as to be rotatable by an arm cylinder 10a, and a arm 10 that can be turned by a bucket cylinder 11a. And a bucket 11 provided at the tip.

  The swivel body 3 is mounted on the traveling body 2 so as to be swivelable. The swivel frame 12 is provided on the left front side of the swivel frame 12 (on the right side in the drawing in FIG. 1). 12 is provided with a machine room 16 in which equipment such as a diesel engine 14 and a hydraulic pump 15 is housed, and a counterweight 17 provided at the rear end of the swivel frame 12.

  The exhaust pipe 18 of the diesel engine 14 is provided with a NOx purification device 30 for purifying the exhaust. The NOx purification device 30 includes a cylindrical container 31 provided in the exhaust pipe 18 of the diesel engine 14, a urea selective reduction catalyst 32 disposed upstream of the exhaust in the container 31, and a downstream of the urea selective reduction catalyst 32. And an oxidation catalyst 33 arranged on the side.

  A urea water injection valve (not shown) is provided in the exhaust pipe 18 on the upstream side of the urea selective reduction catalyst 32. The urea water injection valve is connected via a urea water supply pipe 35 to a urea water tank 40 that stores urea water described later. In this example, the urea water tank 40 is installed on the right front side of the swivel frame 12 (the right side on the front side in FIG. 1). The urea water supply pipe 35 has a urea water suction pipe 35 a (see FIG. 3) disposed in the urea water tank 40. A supply pump 36 is provided in the urea water supply pipe 35.

  The NOx purification device 30 injects urea water pressurized by the supply pump 36 into the exhaust pipe 18 by a urea water injection valve (not shown), and uses the ammonia generated from the urea water to select the urea selective reduction catalyst 32. Thus, the nitrogen oxide in the exhaust gas is reduced and decomposed into water and nitrogen, and the remaining ammonia that cannot be reacted with the nitrogen oxide is oxidized and decomposed by the oxidation catalyst 33.

Next, a first embodiment of the urea water tank of the present invention will be described with reference to FIGS. In FIG. 2 and FIG. 3, those reference numerals same sign-shown in FIG. 1, since the same parts, and a detailed description thereof will be omitted.

  2 and 3, the urea water tank 40 includes a resin tank main body 41 including a bottom surface portion 42, a top surface portion 43, and a side surface portion 44 provided between the bottom surface portion 42 and the top surface portion 43. I have. The side surface portion 44 of the tank body 41 includes a front side surface portion 45 (right side in FIG. 3), a rear side surface portion 46 (left side in FIG. 3), a left side surface portion 47 (right side in FIG. 2), and a right side surface portion 48 (left side in FIG. 2). It consists of

  A projecting portion 45 a that projects to the front side (right side in FIG. 3) with respect to the front side surface portion 45 is formed at a substantially central portion in the width direction (left-right direction in FIG. 2) of the front side surface portion 45. A water supply port 49 is provided in the upper part of the overhanging portion 45a. A cap 50 for closing the water supply port 49 is detachably attached to the water supply port 49.

  An opening 43a through which various pipes and sensors to be described later can be collectively inserted is provided in the front side portion of the upper surface portion 43 of the tank body 41 in the substantially central portion in the width direction. A lid 51 is detachably attached to the opening 43 a of the upper surface portion 43.

  The lid 51 is assembled with a urea water suction pipe 35a, a temperature sensor 52 for measuring the temperature of the urea water in the tank body 41, and a heating pipe 53 for heating the urea water.

  For example, as shown in FIG. 3, the urea water suction pipe 35 a passes through the opening 43 a of the upper surface portion 43 of the tank body 41 and hangs down to the vicinity of the bottom surface portion 42.

  For example, the temperature sensor 52 passes through the opening 43 a of the upper surface portion 43 and hangs down to the vicinity of the bottom surface portion 42.

  For example, the warming pipe 53 is inserted into the opening 43a of the upper surface part 43 and extends vertically along the urea water suction pipe 35a and the temperature sensor 52, and the vertical pipe part 53a. It is comprised by the bending piping part 53b bent toward the back side part 46 side (left side of FIG. 3).

  In the heating pipe 53, for example, engine cooling water of the diesel engine 14 (see FIG. 1) is circulated as a urea water heating fluid. By disposing the heating pipe 53 in the vicinity of the urea water suction pipe 35a, the inability to supply urea water to the urea water injection valve (not shown) due to freezing of the urea water in the urea water suction pipe 35a is prevented. Yes.

  Inside the tank body 41, a metal pipe 54 for heating urea water is disposed along the upper surface portion 43, the front surface portion 45, the bottom surface portion 42, and the rear surface portion 46. For example, one end of the metal pipe 54 is connected to the heating pipe 53 outside the tank body 41. The metal pipe 54 is connected to the front surface portion 45 via a connecting member 55 described later at a lower portion along the front surface portion 45. By disposing the metal pipe 54 in the vicinity of the bottom face portion 42 and the side face portion 44 of the tank body 41, the urea water in a region that is difficult to thaw with the heat from the heating pipe 53 is thawed with the heat of the metal pipe 54.

  As shown in FIGS. 2 and 3, a water level gauge 70 is provided on the outer surface of the front side surface 45 of the tank body 41 in the vicinity of the overhanging portion 45 a so that the stored urea water level can be visually observed from the outside. Yes. A member for transmitting the heat of the metal pipe 54 for heating to the water level gauge 70 is provided at a portion of the front side surface portion 45 provided with the water level gauge 70.

Next, a detailed configuration of a water level meter and a member for heat transfer to the water level meter constituting the first embodiment of the urea water tank of the present invention will be described with reference to FIGS. Note that, in FIGS. 4-7, those reference numerals same sign-shown in FIGS. 1-3, because it is same parts, and a detailed description thereof will be omitted.

  4 and 5, the water level gauge 70 has a transparent cylindrical water level gauge main body 71 that is disposed on the outer surface side of the side surface portion 44 of the tank main body 41 and extends in the vertical direction. As the water level gauge main body 71, for example, a transparent rubber tube is used. At both ends of the water level gauge main body 71, metal attachment members 72 for attaching the end of the water level gauge main body 71 to the front side face portion 45 of the tank main body 41 are provided. The upper and lower ends of the water level gauge main body 71 are fastened with clips 73.

  The attachment member 72 includes a substantially rectangular parallelepiped attachment portion 72a extending in the left-right direction, a connection portion 72b extending upward or downward from the central portion in the left-right direction of the attachment portion 72a, and connected to the end of the water level meter main body 71. It consists of A flow passage 72c for circulating urea water is provided in the central portion in the left-right direction of the attachment portion 72a and the connection portion 72b. As shown in FIGS. 6 and 7, bolt insertion holes 72d are provided in the left and right portions of the attachment portion 72a.

  Next, the detailed structure of the heat transfer member constituting the first embodiment of the urea water tank of the present invention will be described with reference to FIGS.

  In FIG. 5, urea water circulation holes 45 b are formed at the attachment positions of the upper and lower attachment members 72 provided on the water level gauge main body 71 in the front side surface portion 45 of the tank main body 41. The circulation hole 45 b includes a large diameter portion that opens to the outer surface of the front side surface portion 45 and a small diameter portion that opens to the inner surface of the front side surface portion 45. A seal member 57 is inserted into the large diameter portion of the circulation hole 45b.

  As shown in FIGS. 5 to 7, metal heat transfer members 58 are provided at positions separated from the upper and lower flow holes 45 b in the front side surface portion 45 in the left-right direction. The heat transfer member 58 has a columnar shape extending in the front-rear direction of the tank body 41 (the left-right direction in FIGS. 5 and 6 and the up-down direction in FIG. 7), and is integrally formed with the tank body 41 by means such as insert molding. As shown in FIGS. 6 and 7, the heat transfer member 58 has one end (the left side in FIG. 6, the lower side in FIG. 7) positioned in the tank body 41 and the other end (the right side in FIG. 6, the upper side in FIG. 7). ) Is located on substantially the same plane as the outer surface of the front side surface portion 45. Screw holes 58a are formed at both ends of the heat transfer member 58, respectively.

  Bolts 74 inserted into the respective bolt insertion holes 72d of the attachment member 72 are respectively screwed into the screw holes 58a on the other end side of each heat transfer member 58, and the left and right portions of the attachment portion 72a of the attachment member 72 are heat transfer members. The other end of 58 is connected. The attachment member 72 presses the seal member 57 inserted into the flow hole 45 b of the front side surface portion 45. The seal member 57 prevents urea water from leaking out of the tank body 41 from the gap between the front side surface portion 45 and the mounting member 72.

  Bolts 56 are respectively screwed into the screw holes 58a on one end side (the left side in FIG. 6 and the lower side in FIG. 7) of the two lower heat transfer members 58 provided on the front side surface 45, and the connecting member 55 is It is connected to one end of the heat transfer member 58. The connecting member 55 is made of a metal plate and has one end formed in a semicircular shape in the longitudinal section. The connecting member 55 fixes the metal pipe 54 at this semicircular arc-shaped portion, and connects one end of the heat transfer member 58 and the heating metal pipe 54.

  In the urea water tank 40 configured as described above, as shown in FIG. 5, the interior of the water level meter main body 71 is inside the tank main body 41 via the flow passage 72 c of the mounting member 72 and the flow hole 45 b of the front side surface portion 45. Communicating with Thus, the urea water in the tank main body 41 can be circulated inside the water level meter main body 71, and the urea water level in the tank main body 41 can be visually recognized from the outside.

  Further, as shown in FIGS. 6 and 7, the lower metal attachment member 72 provided in the water level gauge main body 71 includes two lower metal heat transfer members 58 provided in the front side surface portion 45 and It is connected to a metal pipe 54 for heating through a metal connecting member 55. For this reason, the heat of the metal pipe 54 is efficiently transmitted to the mounting member 72.

  As described above, according to the first embodiment of the urea water tank of the present invention, the metal mounting member 72 provided at the end of the water level gauge 70 is provided with the metal heat transfer provided in the tank body 41. Since it is connected to the heating metal pipe 54 in the tank main body 41 via the member 58, the heat for heating can be efficiently transmitted to the mounting member 72, and the urea water frozen inside the water level gauge 70 can be transferred. Can be thawed. As a result, even when used in a cryogenic region where urea water freezes, the water level meter 70 can confirm the water level of the urea water in the tank body 41.

  Moreover, according to this Embodiment, since the attachment member 72 is provided with the attaching part 72a which the two heat transfer members 58 connect, compared with the case where the one heat transfer member 58 connects with the attachment member 72, The heat transfer area from the metal pipe 54 to the mounting member 72 increases, and the heat of the metal pipe 54 can be efficiently transmitted to the mounting member 72.

  Furthermore, according to the present embodiment, since the metal pipe 54 is disposed along the front surface 45, the bottom surface 42, and the rear surface 44, the side surface of the tank body 41 that is not easily thawed by the outside air in a cryogenic region. The urea water in the vicinity of 44 can be thawed by the heat of the metal pipe 54.

Next, a second embodiment of the urea water tank of the present invention will be described with reference to FIGS.
FIGS. 8 to 10 show a second embodiment of the urea water tank of the present invention, and FIG. 8 is an enlarged front view showing a water level meter constituting the second embodiment of the urea water tank of the present invention. FIG. 9 is a longitudinal sectional view of the water level meter constituting the second embodiment of the urea water tank of the present invention shown in FIG. 8 as viewed from the arrow IX-IX, and FIG. 10 is the urea of the present invention shown in FIG. It is the cross-sectional view which looked at the water level meter which comprises 2nd Embodiment of a water tank from the XX arrow. In FIG. 8 through FIG. 10, those reference numerals same sign-shown in FIGS. 1 to 7, since the same parts, and a detailed description thereof will be omitted.

  In the second embodiment of the urea water tank of the present invention, the attachment member 92 is connected to one heat transfer member 88, and the bolt insertion hole 92d of the attachment member 92 is a flow passage for urea water circulation. The point which comprises a part and the point in which the heat-transfer member 88 has the flow hole for urea water distribution | circulation differ from 1st Embodiment mentioned above.

  Specifically, in FIGS. 8 and 9, each mounting member 92 is provided with one bolt insertion hole 92d that penetrates in the front-rear direction (left-right direction in FIG. 9). The attachment member 92 is provided with a passage 92e that extends in the vertical direction and communicates the bolt insertion hole 92d with the inside of the water level gauge main body 71. The bolt insertion hole 92d and the passage 92e constitute a flow passage for urea water circulation.

  Next, the detailed structure of the heat transfer member which comprises 2nd Embodiment of the urea water tank of this invention is demonstrated using FIG.9 and FIG.10.

  9 and 10, one heat transfer member 88 is provided at each attachment position of the upper and lower attachment members 92 provided on the water level gauge main body 71 in the front side surface portion 45 of the tank main body 41. The heat transfer member 88 is formed with a first flow hole 88a penetrating in the axial direction (left-right direction in FIG. 9, up-down direction in FIG. 10). A female screw is formed on the inner peripheral surface of the first flow hole 88a. A portion of the heat transfer member 88 located in the tank body 41 is formed with a second flow hole 88b penetrating in the radial direction (perpendicular to the plane of FIG. 9, left and right in FIG. 10). The first flow hole 88a and the second flow hole 88b constitute a flow hole for urea water flow.

  A bolt 86 inserted into the bolt insertion hole 92d of the attachment member 92 is screwed into the female thread portion on the other end side (the right side in FIG. 9 and the upper side in FIG. 10) of the first flow hole 88a of the heat transfer member 88. The attachment member 92 is connected to the other end of the heat transfer member 88.

  A communication hole 86 a is formed in the bolt 86. The communication hole 86a extends in the axial direction of the bolt (the left-right direction in FIG. 9, the up-down direction in FIG. 10), opens in the distal end surface thereof, and the radial direction of the bolt from the base end side of the axial hole (see FIG. 9 is a radial hole that extends in the direction perpendicular to the plane of FIG. 9 and the horizontal direction in FIG.

  In a state where the bolt 86 is inserted into the bolt insertion hole 92d of the mounting member 92 and screwed into the other end side of the heat transfer member 88, the interior of the water level gauge main body 71 includes the passage 92e of the mounting member 92 and the bolt insertion hole 92d. And the first flow hole 88a of the heat transfer member through the communication hole 86a of the bolt 86.

  A bolt 86 is screwed into the female thread portion on one end side (the left side in FIG. 9, the lower side in FIG. 10) of the first flow hole 88 a of the lower heat transfer member 88 provided in the front side surface 45. The connecting member 55 is connected to one end of the heat transfer member 88.

  In a state where the bolt 86 is screwed to one end side of the heat transfer member 88, the inside of the tank body 41 is connected to the heat transfer member 88 via the second flow hole 88 b of the heat transfer member 88 and the communication hole 86 a of the bolt 86. It communicates with the first flow hole 88a.

  In the urea water tank configured as described above, as shown in FIG. 9, the interior of the water level meter main body 71 includes a passage 92 e of the mounting member 92, a bolt insertion hole 92 d, a communication hole 86 a of the bolt 86, and a heat transfer member. The tank body 41 communicates with the first and second circulation holes 88a and 88b. As a result, the urea water in the tank main body 41 can flow into the water level meter main body 71 through the first flow hole 88 a and the second flow hole 88 b of the heat transfer member 88.

  Further, the lower mounting member 92 provided in the water level meter main body 71 is connected to the heating metal pipe 54 via the one lower heat transfer member 88 and the connecting member 55 provided in the front side surface portion 45. ing.

  According to the second embodiment of the urea water tank of the present invention described above, the same effect as that of the first embodiment described above can be obtained.

  Moreover, according to this Embodiment, since the attachment member 92 is connected with the heat-transfer member 88 which has the flow hole (1st flow hole 88a and 2nd flow hole 88b) for urea water flow, Rather than transmitting the heating heat to the urea water flowing into the total 90 through the attachment member 92, the heating water does not pass through the attachment member 92 to the urea water flowing through the flow holes of the heat transfer member 88. I can tell you. For this reason, the heat of the metal pipe 54 can be efficiently transmitted from the tank body 41 to the urea water flowing to the water level gauge 90.

  In the above-described embodiment, in order to promote the thawing of the urea water frozen inside the water level meter 90, as shown in FIG. 9, a metal member 95 that covers the outer peripheral surface of the lower end portion of the water level meter main body 71. Can be provided. In FIG. 9, the metal member 95 is indicated by a two-dot chain line.

  Moreover, although the example which applied the urea water tank of this invention to the hydraulic shovel was shown in the above-mentioned embodiment, it can apply widely to the vehicle carrying a diesel engine.

  In addition, although the example which provided the water level meter 70 in the front side surface part 45 of the tank main body 41 was shown, the water level meter 70 can be provided in side surface parts 44 other than the front side surface part 45 of the tank main body 41.

  Further, in the above-described embodiment, the example in which the metal pipe 54 for heating is connected to only the lower mounting member 72 provided in the water level gauge main body 71 via the connecting member 55 is shown. The metal pipe 54 can be connected to the mounting member 72.

  In the above-described embodiment, the example in which the upper and lower attachment members 72 provided on the water level meter main body 71 are made of metal is shown. However, only the lower attachment member 72 can be made of metal.

  Moreover, in the above-mentioned embodiment, although the example which made the heat-transfer member 58 of the upper and lower sides metal was shown, only the lower heat-transfer member 58 can be made of metal.

40 Urea water tank 41 Tank body 42 Bottom surface 44 Side surface 54 Metal pipe 55 for heating 55 Connecting member 70, 90 Water level gauge 72, 92 Mounting member 72a Mounting portion 72c Flow path 58, 88 Heat transfer member 88a First flow Hole (flow hole)
88b Second flow hole (flow hole)
95 Metal parts

Claims (3)

A urea water tank equipped with a water level gauge on the outer surface of the tank body that allows the stored urea water level to be visually observed from the outside,
A metal pipe for heating urea water disposed in the tank body;
A metal mounting member provided at an end of the water level meter and mounting the water level meter to a side surface of the tank body;
A metal heat transfer member provided on the side surface of the tank body such that one end is located in the tank body and the other end is connected to the mounting member;
A metal connecting member that connects one end of the heat transfer member and the metal pipe for heating;
The attachment member has a flow passage for urea water circulation in the central portion thereof, and has attachment portions to which at least two of the heat transfer members provided on the side surface portion of the tank body are respectively connected to the left and right portions thereof. A urea water tank characterized by In the urea water tank according to claim 1 ,
A urea water tank, further comprising a metal member that covers an outer peripheral surface at a lower end portion of the water level gauge. In the urea water tank according to claim 1 or 2 ,
The urea water tank, wherein the heating metal pipe is disposed along the bottom surface and the side surface in the tank body.

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