Reducing agent supply device

Abstract

To provide a reducing agent supply device that can be miniaturized and has excellent maintainability.SOLUTION: A reducing agent supply device 10 includes: a nozzle unit 11 for adjusting a flow rate of a reducing agent to be supplied to an NOx emission control catalyst device 2; and a pump unit 12 for supplying a reducing agent to the nozzle unit 11. The nozzle unit 11 and the pump unit 12 are arranged in positions offset from each other in top view.SELECTED DRAWING: Figure 3

Description

Technical Field

[0001] The present invention relates to a reducing agent supply device that supplies a reducing agent to a NOx purification catalyst device mounted on a ship or the like.

Background Art

[0002] A NOx purification catalyst device mounted on a ship or the like requires the supply of a reducing agent (for example, aqueous urea). Patent Document 1 discloses a reducing agent supply device (aqueous urea supply device) including a flow meter and an air supply unit disposed within a frame body, and a pump unit disposed outside the frame body.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] In the prior art as shown in Patent Document 1, it is necessary to provide a reducing agent supply device for each NOx purification catalyst device, and complicated work for connecting each unit is required in each reducing agent supply device. Conventionally, connecting each unit by piping has been performed at a shipyard, but in some cases, there are pipes in which air is likely to accumulate.

[0005] In addition, in order to enable the NOx purification catalyst device to be mounted on a smaller ship, it is desirable to arrange the reducing agent supply device compactly. However, even if the reducing agent supply device is arranged compactly, it is necessary to avoid deterioration of maintainability due to compactification.

[0006] The present invention has been made in view of the above problems, and an object thereof is to provide a reducing agent supply device that can be made compact and has excellent maintainability.

Means for Solving the Problem

[0007] In order to solve the above problems, a reducing agent supply device according to a first aspect of the present invention is a reducing agent supply device that supplies a reducing agent to an exhaust gas purification device, and includes a reducing agent flow rate adjustment unit that adjusts the flow rate of the reducing agent supplied to the exhaust gas purification device, and a reducing agent pumping unit that supplies the reducing agent to the reducing agent flow rate adjustment unit. The reducing agent flow rate adjustment unit and the reducing agent pumping unit are arranged at positions offset from each other in a top view.

[0008] According to the above configuration, since the reducing agent flow rate adjustment unit and the reducing agent pumping unit are offset from each other in a top view, when performing maintenance work from above the reducing agent supply device, in the relationship between the reducing agent flow rate adjustment unit and the reducing agent pumping unit, one of the reducing agent flow rate adjustment unit and the reducing agent pumping unit does not obstruct access to the other, and the maintainability of the reducing agent supply device is improved.

[0009] Further, in the above reducing agent supply device, the reducing agent pumping unit may be configured to be arranged at a position lower than the reducing agent flow rate adjustment unit.

[0010] According to the above configuration, by arranging the heavy reducing agent pumping unit at a low position, the assembly of the reducing agent pumping unit during maintenance becomes easy. Further, since the reducing agent flow rate adjustment unit and the reducing agent pumping unit are offset from each other, even if the reducing agent spills from the reducing agent flow rate adjustment unit during maintenance, it is possible to suppress the spilled reducing agent from adhering to the reducing agent pumping unit which is an electrical device.

[0011] Further, the above reducing agent supply device may further include a gas purification unit that purifies the gas supplied to the reducing agent flow rate adjustment unit, and the gas purification unit may be configured to be arranged below the reducing agent flow rate adjustment unit.

[0012] According to the above configuration, by arranging the gas purification unit, which is not an electrical device, below the reducing agent flow rate adjustment unit, there is no particular problem even if the reducing agent is applied to the gas purification unit during maintenance of the reducing agent flow rate adjustment unit. With such an arrangement, the space in the reducing agent supply device can be effectively utilized.

[0013] Further, the reducing agent supply device may include a reducing agent inlet for connecting a reducing agent tank to the reducing agent pumping unit, a reducing agent outlet for connecting the exhaust gas purification device to the reducing agent flow rate adjustment unit, and a gas inlet for connecting an air tank or a compressor to the gas purification unit. The reducing agent inlet, the reducing agent outlet, and the gas inlet may be provided on the same side surface of the reducing agent supply device.

[0014] According to the above configuration, by providing the inlet and outlet portions of the reducing agent and air in the reducing agent supply device on the same side surface, it is possible to easily attach and detach the pipes connected to these inlet and outlet portions, and the efficiency of maintenance of the reducing agent supply device can be improved.

[0015] Further, in the reducing agent supply device, a relay pipe connecting the reducing agent inlet and the reducing agent pumping unit is arranged with a gap between the reducing agent inlet and the reducing agent pumping unit, and a reducing agent purification unit for purifying the reducing agent may be installed in the relay pipe.

[0016] According to the above configuration, by installing a reducing agent purification unit in the relay pipe, even if the reducing agent spills during maintenance of the reducing agent purification unit (for example, replacement of the urea filter), problems such as the spilled reducing agent reaching the reducing agent pumping unit can be prevented.

[0017] Further, the reducing agent supply device may further include a gas flow rate adjustment unit for controlling the flow of the gas that has passed through the gas purification unit, and the gas flow rate adjustment unit may be arranged above the reducing agent pumping unit. Alternatively, the reducing agent supply device may further include a terminal housing unit electrically connected to the gas flow rate adjustment unit, and the terminal housing unit may be arranged above the reducing agent pumping unit.

[0018] According to the above configuration, even if the gas flow rate adjusting part or the terminal accommodating part is disassembled or the like during maintenance, the reducing agent will not drip. By arranging the gas flow rate adjusting part or the terminal accommodating part above the reducing agent pumping part, while effectively using the space above the reducing agent pumping part, it is possible to compactly arrange the units in the reducing agent supply device.

[0019] Also, in order to solve the above problems, a reducing agent supply device which is a second aspect of the present invention is a reducing agent supply device that supplies a reducing agent to an exhaust gas purification device, and includes a reducing agent flow rate adjusting part that adjusts the flow rate of the reducing agent supplied to the exhaust gas purification device, and a reducing agent pumping part that supplies the reducing agent to the reducing agent flow rate adjusting part. The reducing agent flow rate adjusting part and the reducing agent pumping part are arranged such that the reducing agent pumping part is positioned lower than the reducing agent flow rate adjusting part and partially overlaps in a top view. At the overlapping portion of the reducing agent flow rate adjusting part and the reducing agent pumping part in the top view, non-electrical system components are arranged between the reducing agent flow rate adjusting part and the reducing agent pumping part.

[0020] According to the above configuration, even if the reducing agent spills from the reducing agent flow rate adjusting part during maintenance, the spilled reducing agent will land on the non-electrical system components, and it is possible to suppress the spilled reducing agent from directly adhering to the reducing agent pumping part.

[0021] Further, the reducing agent supply device can be configured to have a bottom member below the reducing agent flow rate adjusting part and the reducing agent pumping part.

[0022] According to the above configuration, by arranging a bottom member below the reducing agent flow rate adjusting part and the reducing agent pumping part, even if the reducing agent spills during maintenance of these units or the like, it can be received by the bottom member, and the outflow of the reducing agent to other places can be prevented.

[0023] Further, in the above reducing agent supply device, each unit included in the reducing agent supply device can be configured to be attached to the device frame.

[0024] According to the above configuration, by fixedly arranging and packaging each unit with respect to the device frame and optimally arranging each unit within the package, a compact arrangement becomes possible. Further, the packaged reducing agent supply device enables centralized maintenance and can be removed as a package for maintenance outside the installation location.

Effects of the Invention

[0025] Even when the reducing agent supply device of the present invention is made compact by arranging each unit in close proximity, the maintainability of the reducing agent supply device can be improved by offsetting the reducing agent flow rate adjustment unit and the reducing agent pumping unit, which are the main component units, in a top view.

Brief Description of the Drawings

[0026]

Figure 1

Figure 2

Figure 3

Figure 4

Figure 5

Figure 6

Figure 7

Modes for Carrying Out the Invention

[0027] 〔Embodiment 1〕 Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. FIG. 1 is a schematic configuration diagram showing an exhaust gas purification system including a reducing agent supply device 10 according to the present embodiment. The exhaust gas purification system shown in FIG. 1 is mounted on, for example, a ship, and generally includes a diesel engine 1, a NOx purification catalyst device (exhaust gas purification device) 2, and a reducing agent supply device 10.

[0028] The diesel engine 1 is a propulsion engine that generates a driving force for propelling the ship or a power generation engine that generates a driving force for a generator that supplies electric power used inside the ship. The NOx purification catalyst device 2 is provided in the exhaust path 3 of the diesel engine 1 and is a device that purifies NOx (nitrogen oxides) contained in the exhaust gas generated by the diesel engine 1 by catalytic reduction. When a plurality of diesel engines 1 are provided, a NOx purification catalyst device 2 is provided for each diesel engine 1. The system of FIG. 1 illustrates a configuration including two diesel engines 1 and two NOx purification catalyst devices 2 each.

[0029] The NOx purification catalyst device 2 requires a reducing agent supplied from the outside in the process of purifying NOx. The reducing agent used here is a liquid, usually aqueous urea. The reducing agent supply device 10 supplies a reducing agent to the NOx purification catalyst device 2.

[0030] The reducing agent supply device 10 mainly includes a nozzle unit (reducing agent flow rate adjustment unit) 11, a pump unit (reducing agent pumping unit) 12, and an air treatment unit (gas purification unit) 13. The nozzle unit 11 includes a flow meter and is a unit that adjusts the flow rate of the reducing agent supplied to the NOx purification catalyst device 2. The nozzle unit 11 is provided in the same number (two in the example of FIG. 1) as the NOx purification catalyst device 2 that receives the supply of the reducing agent from the reducing agent supply device 10. Further, the nozzle unit 11 is composed of a urea flow meter side portion 111 and a display portion 112, and the urea flow meter side portion 111 and the display portion 112 are connected to each other by their respective flange portions.

[0031] The pump unit 12 is a unit that feeds the reducing agent to the nozzle unit 11. The air treatment unit 13 is a unit that purifies the assist air sent to the reducing agent injector 4 (has a filter function for the assist air). The pump unit 12 and the air treatment unit 13 are each provided in the reducing agent supply device 10.

[0032] Subsequently, the specific configuration of the reducing agent supply device 10 according to Embodiment 1 will be described. FIG. 2 is a perspective view of the reducing agent supply device 10 according to Embodiment 1. FIG. 3 is a front view of the reducing agent supply device 10 according to Embodiment 1. FIG. 4 is a top view of the reducing agent supply device 10 according to Embodiment 1. FIG. 5 is a right side view of the reducing agent supply device 10 according to Embodiment 1. FIG. 6 is a left side view of the reducing agent supply device 10 according to Embodiment 1. Here, the front of the reducing agent supply device 10 refers to the direction in which the visible area of the reducing agent supply device 10 is the widest when the shape of the reducing agent supply device 10 is regarded as a substantially rectangular parallelepiped.

[0033] The reducing agent supply device 10 shown in FIGS. 2 to 6 includes units such as a terminal box (terminal housing part) 14, a bubble removing device 15, a metering valve 16, and a gas flow rate adjusting part 17 in addition to the nozzle unit 11, the pump unit 12, and the air treatment unit 13. The terminal box 14 is a unit that houses terminals in the reducing agent supply device 10 (for example, control terminals of solenoid valves included in the gas flow rate adjusting part 17 described later). The bubble removing device 15 is a device that removes bubbles of the reducing agent sent from the pump unit 12 toward the nozzle unit 11. The metering valve 16 is a unit that controls the surplus reducing agent not used in the nozzle unit 11 (the reducing agent returned from the pump unit 12 to the reducing agent tank). The gas flow rate adjusting part 17 controls the flow of air that has passed through the air treatment unit 13, and is a unit composed of a solenoid valve and a flow meter for switching between an assist mode (a mode in which compressed air is sent as assist air to the nozzle unit 11) and a purge mode (a mode in which compressed air in the piping is exhausted).

[0034] Each unit included in the reducing agent supply device 10 is attached to a frame-shaped or box-shaped device frame 20, and its positional relationship is fixed. Moreover, they are appropriately connected via pipes (such as a reducing agent pipe and an air pipe). Thus, the configuration of fixedly arranging each unit on the device frame 20 is suitable because it is easy to remove and maintain only one unit from the reducing agent supply device 10. However, each unit in the reducing agent supply device 10 can also be fixedly arranged with respect to each other by connection via pipes. Therefore, in the reducing agent supply device 10, the device frame 20 is not essential.

[0035] Also, the reducing agent supply device 10 sends a reducing agent and assist air to the NOx purification catalyst device 2. However, the reducing agent tank for storing the reducing agent and the air tank for storing the compressed air serving as the assist air do not have to be built into the reducing agent supply device 10 and may be externally attached to the reducing agent supply device 10. The reducing agent supply device 10 in FIGS. 2 to 6 exemplifies a type with an externally attached reducing agent tank and air tank, and the illustration of the reducing agent tank and air tank is omitted. However, it is possible to detachably attach the externally attached reducing agent tank and air tank outside the device frame 20 (for example, on the back side of the device frame 20). Further, the compressed air serving as the assist air may be sent to the NOx purification catalyst device 2 by a compressor instead of from the air tank.

[0036] The reducing agent supply device 10 is packaged by fixedly arranging each unit with respect to the device frame 20, and a compact arrangement is also possible by arranging each unit optimally within the package. Therefore, the reducing agent supply device 10 is easy to mount on a small ship, and since it can be mounted on the ship as a package, the work of pipe-connecting each unit at the shipyard becomes unnecessary. Furthermore, the reducing agent supply device 10 enables centralized maintenance due to packaging, and it is also possible to perform maintenance outside the installation location by removing the entire package.

[0037] Furthermore, in the reducing agent supply device 10, a device is provided to avoid deterioration of maintainability when arranging each unit compactly. That is, when trying to arrange each unit in the reducing agent supply device 10 compactly, it is necessary to arrange the respective units in close proximity. However, if one tries to access a certain unit for maintenance, other units may get in the way and make access difficult. Alternatively, if the reducing agent (urea water) leaks from a unit during maintenance, there is also a problem that the leaked reducing agent may get on other units (especially electrical equipment) and cause malfunctions. The reducing agent supply device 10 according to the present embodiment has a configuration for solving these problems.

[0038] First, at least the urea flow meter side portion 111 of the nozzle unit 11 and the pump unit 12 are arranged at offset positions from each other in a top view of the reducing agent supply device 10. Furthermore, it is preferable that at least the urea flow meter side portion 111 of the nozzle unit 11 and the pump unit 12 are also arranged at offset positions from each other in a front view of the reducing agent supply device 10. In the reducing agent supply device 10 of this example, at least the urea flow meter side portion 111 of the nozzle unit 11 and the pump unit 12 are arranged in an offset manner in both the top view and the front view.

[0039] Note that since at least the urea flow meter side portion 111 of the nozzle unit 11 and the pump unit 12 have different shapes, they will not be completely overlapped when viewed from any direction. Therefore, the offset arrangement of at least the urea flow meter side portion 111 of the nozzle unit 11 and the pump unit 12 means a state where the units do not completely overlap or only a partial overlap is allowed when viewed from a certain direction. Also, the state where only a partial overlap is allowed means a state where, for each of at least the urea flow meter side portion 111 of the nozzle unit 11 and the pump unit 12, the overlapping area of one unit with respect to the other unit is 35% or less (more preferably 30% or less) of the total area of that unit.

[0040] When the nozzle unit 11 and the pump unit 12 are offset from each other in a top view and maintenance work is to be performed from above the reducing agent supply device 10, in the relationship between the nozzle unit 11 and the pump unit 12, one unit does not interfere with access to the other unit, and the maintainability of the reducing agent supply device 10 is improved. Similarly, if the nozzle unit 11 and the pump unit 12 are offset from each other in a front view, the maintainability is improved in maintenance work from the front.

[0041] Also, the pump unit 12 is preferably arranged at a position lower than the nozzle unit 11. By arranging the heavy pump unit 12 at a lower position, it becomes easier to assemble the pump unit 12 during maintenance. And when the pump unit 12 is arranged at a position lower than the nozzle unit 11, if the nozzle unit 11 and the pump unit 12 are offset from each other in a top view, when disassembling the nozzle unit 11 for maintenance, even if the reducing agent spills from the nozzle unit 11, it is possible to suppress the spilled reducing agent from adhering to the pump unit 12 which is an electrical device. Thereby, the maintainability of the nozzle unit 11 in the reducing agent supply device 10 can be improved.

[0042] Second, the air treatment unit 13 is arranged below the nozzle unit 11. Since the air treatment unit 13 is not an electrical device, there is no particular problem even if the reducing agent splashes during maintenance of the nozzle unit 11 by arranging it below the nozzle unit 11. Also, when the pump unit 12 is arranged at a position lower than the nozzle unit 11, a space is generated below the nozzle unit 11, and by arranging the air treatment unit 13 in this space, the space inside the reducing agent supply device 10 can be effectively utilized.

[0043] Further, the nozzle unit 11 is preferably arranged near the outer peripheral portion of the reducing agent supply device 10 in order to facilitate connection to the NOx purification catalyst device 2. The nozzle unit 11 in this example is arranged near the right side surface of the reducing agent supply device 10 (see FIG. 3). On the other hand, the air treatment unit 13 is also preferably arranged near the outer peripheral portion of the reducing agent supply device 10 in order to facilitate connection to an external air tank. By arranging the air treatment unit 13 below the nozzle unit 11, the nozzle unit 11 and the air treatment unit 13 are arranged near the same side surface of the reducing agent supply device 10, and there is also an advantage that maintenance workers of the reducing agent supply device 10 can maintain both with little movement.

[0044] In this case, the reducing agent outlet portion 32 for connecting the NOx purification catalyst device 2 to the nozzle unit 11 and the air inlet portion (gas inlet portion) 33 for connecting the air tank to the air treatment unit 13 are preferably provided on the same side surface of the reducing agent supply device 10 (the right side surface in this example: see FIG. 6). Further, the reducing agent inlet portion 31 for connecting an external reducing agent tank to the pump unit 12 is also preferably provided on the same side surface as the reducing agent outlet portion 32 and the air inlet portion 33. Thus, by providing the inlet and outlet portions of the reducing agent and air in the reducing agent supply device 10 on the same side surface, the attachment and detachment of the pipes connected to these inlet and outlet portions can be easily performed, and the maintenance efficiency of the reducing agent supply device 10 can be improved.

[0045] Thirdly, as shown in FIG. 3, the relay pipe 41 connecting the reducing agent inlet portion 31 and the pump unit 12 is arranged substantially horizontally between the reducing agent inlet portion 31 and the pump unit 12, and a reducing agent purification portion 18 for purifying the reducing agent (having a filter function for the reducing agent) is installed in the middle of this relay pipe 41. By installing the reducing agent purification portion 18 on the relay pipe 41, even if the reducing agent spills during maintenance of the reducing agent purification portion 18 (for example, replacement of the urea filter), it is possible to prevent problems such as the spilled reducing agent reaching the pump unit 12.

[0046] Fourthly, the reducing agent supply device 10 arranges a basin-shaped (tray-shaped) bottom member 21 below the nozzle unit 11 and the pump unit 12. The bottom member 21 is preferably attached as a bottom plate that covers the entire bottom surface of the device frame 20. By arranging the bottom member 21 below the nozzle unit 11 and the pump unit 12, even if the reducing agent spills during maintenance of these units, it can be received by the bottom member 21, and the outflow of the reducing agent to other places can be prevented.

[0047] Fifthly, the gas flow rate adjustment unit 17 is arranged above the pump unit 12. Even if the gas flow rate adjustment unit 17 is disassembled or the like during maintenance, the liquid reducing agent will not drip. Therefore, by arranging the gas flow rate adjustment unit 17 above the pump unit 12, while effectively using the space above the pump unit 12, it is possible to compactly arrange the units in the reducing agent supply device 10.

[0048] Also, the terminal box 14 is preferably arranged above the pump unit 12. Since the reducing agent does not drip during maintenance of the terminal box 14 either, by arranging the terminal box 14 above the pump unit 12, while effectively using the space above the pump unit 12, it is possible to compactly arrange the units in the reducing agent supply device 10.

[0049] 〔Embodiment 2〕 In the above-described Embodiment 1, the pump unit 12 is arranged at a position lower than the nozzle unit 11, and in a top view of the reducing agent supply device 10, the nozzle unit 11 and the pump unit 12 are offset from each other. In this configuration, even if the reducing agent spills from the nozzle unit 11 during maintenance, it is possible to suppress the spilled reducing agent from adhering to the pump unit 12, which is an electrical device. In the present Embodiment 2, another configuration example that can suppress the spilled reducing agent from the nozzle unit 11 from adhering to the pump unit 12 will be described. FIG. 7 is a front view of the reducing agent supply device 10 according to the present Embodiment 2.

[0050] In the reducing agent supply device 10 according to the present Embodiment 2, the pump unit 12 is arranged at a position lower than the nozzle unit 11, and in a top view of the reducing agent supply device 10, the nozzle unit 11 and the pump unit 12 are arranged such that a part of them overlaps. And between the nozzle unit 11 and the pump unit 12, non-electrical components are arranged at the overlapping portion of these units in a top view. In the example of FIG. 7, a pressure switch 50 is arranged as the non-electrical component. This pressure switch 50 monitors the pressure on the outlet side of the pump unit and transmits an NG signal to the controller of the reducing agent supply device 10 when the pressure deviates from the set value.

[0051] In the reducing agent supply device 10 according to the present Embodiment 2, even if the reducing agent spills from the nozzle unit 11 during maintenance, the spilled reducing agent will fall on the non-electrical components and will not directly adhere to the pump unit 12. Thereby, similar to Embodiment 1, there is no concern that the reducing agent will fall on the pump unit 12, and the maintainability of the nozzle unit 11 is improved.

[0052] All the embodiments disclosed this time are illustrative in all respects and do not serve as a basis for a restrictive interpretation. Therefore, the technical scope of the present invention is not construed only by the above-described embodiments, but is defined based on the description in the claims. Also, all changes within the meaning and scope equivalent to the claims are included.

Description of Symbols

[0053] 1 Diesel engine 2 NOx purification catalyst device (exhaust gas purification device) 3 Exhaust path 4 Reducing agent injector 10 Reducing agent supply device 11 Nozzle unit (reducing agent flow rate adjustment part) 111 Urea flow meter side part 112 Display part 12 Pump unit (reducing agent pumping part) 13 Air treatment unit (gas purification part) 14 Terminal box (terminal housing part) 15 Bubble removal device 16 Metering valve 17 Gas flow rate adjustment part 18 Reducing agent purification part 20 Device frame 21 Bottom member 31 Reducing agent inlet part 32 Reducing agent outlet part 33 Air inlet part (gas inlet part) 41 Relay pipe 50 Pressure switch

Claims

1. A reducing agent supply device for supplying a reducing agent to an exhaust gas purification device, comprising a reducing agent flow rate adjustment unit for adjusting the flow rate of the reducing agent supplied to the exhaust gas purification device, and a reducing agent pumping unit for supplying the reducing agent to the reducing agent flow rate adjustment unit, wherein the reducing agent flow rate adjustment unit and the reducing agent pumping unit are arranged at positions offset from each other in a top view, and each unit included in the reducing agent supply device is attached to a device frame and arranged within the space of the device frame. The reducing agent supply device is characterized by this.

2. A reducing agent supply device for supplying a reducing agent to an exhaust gas purification device, comprising a reducing agent flow rate adjustment unit for adjusting the flow rate of the reducing agent supplied to the exhaust gas purification device, and a reducing agent pumping unit for supplying the reducing agent to the reducing agent flow rate adjustment unit, wherein the reducing agent flow rate adjustment unit and the reducing agent pumping unit are arranged at positions offset from each other in a top view, and having a basin-shaped bottom member below the reducing agent flow rate adjustment unit and the reducing agent pumping unit. The reducing agent supply device is characterized by this.

3. A reducing agent supply device for supplying a reducing agent to an exhaust gas purification device, comprising a reducing agent flow rate adjustment unit for adjusting the flow rate of the reducing agent supplied to the exhaust gas purification device, and a reducing agent pumping unit for supplying the reducing agent to the reducing agent flow rate adjustment unit, wherein the reducing agent flow rate adjustment unit and the reducing agent pumping unit are arranged at positions offset from each other in a top view, and the reducing agent pumping unit is arranged at a position lower than the reducing agent flow rate adjustment unit, and in a top view, a part of them overlaps, and at the overlapping portion of the reducing agent flow rate adjustment unit and the reducing agent pumping unit in a top view, non-electric system components related to the control of the reducing agent supply device are arranged between the reducing agent flow rate adjustment unit and the reducing agent pumping unit. The reducing agent supply device is characterized by this.

4. A reducing agent supply device according to claim 1 or 2, wherein the reducing agent pumping section is arranged at a position lower than the reducing agent flow rate adjusting section.

5. A reducing agent supply device for supplying a reducing agent to an exhaust gas purification device, wherein a reducing agent flow rate adjusting section for adjusting the flow rate of the reducing agent supplied to the exhaust gas purification device; a reducing agent pumping section for supplying the reducing agent to the reducing agent flow rate adjusting section; the reducing agent flow rate adjusting section and the reducing agent pumping section are arranged at offset positions in a top view; further comprising a gas purification section for purifying the gas supplied to the reducing agent flow rate adjusting section; the gas purification section is arranged below the reducing agent flow rate adjusting section.

6. A reducing agent supply device according to claim 5, wherein it has a reducing agent inlet section for connecting a reducing agent tank to the reducing agent pumping section, a reducing agent outlet section for connecting the exhaust gas purification device to the reducing agent flow rate adjusting section, and a gas inlet section for connecting an air tank or a compressor to the gas purification section; the reducing agent inlet section, the reducing agent outlet section, and the gas inlet section are provided on the same side surface of the reducing agent supply device.

7. A reducing agent supply device according to claim 6, wherein an intermediate pipe connecting the reducing agent inlet section and the reducing agent pumping section is arranged with a gap between the reducing agent inlet section and the reducing agent pumping section; a reducing agent purification section for purifying the reducing agent is installed in the intermediate pipe.

8. A reducing agent supply device according to any one of claims 5 to 7, wherein it further comprises a gas flow rate adjusting section for controlling the flow of the gas that has passed through the gas purification section. The reducing agent supply device is characterized in that the gas flow rate adjusting part is arranged above the reducing agent pumping part.

9. The reducing agent supply device according to claim 8, further comprising a terminal accommodating part electrically connected to the gas flow rate adjusting part, The reducing agent supply device is characterized in that the terminal accommodating part is arranged above the reducing agent pumping part.

10. A reducing agent supply device for supplying a reducing agent to an exhaust gas purification device, a reducing agent flow rate adjusting part for adjusting the flow rate of the reducing agent supplied to the exhaust gas purification device, and a reducing agent pumping part for supplying the reducing agent to the reducing agent flow rate adjusting part, wherein the reducing agent flow rate adjusting part and the reducing agent pumping part are arranged such that the reducing agent pumping part is located at a position lower than the reducing agent flow rate adjusting part and partially overlaps in a top view, and non-electrical components related to the control of the reducing agent supply device are arranged between the reducing agent flow rate adjusting part and the reducing agent pumping part at the overlapping portion of the reducing agent flow rate adjusting part and the reducing agent pumping part in a top view.

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