Urea pump mounted at bottom of urea tank

Abstract

The utility model relates to the technical field of tail gas treatment, in particular to a urea pump installed at the bottom of a urea tank, which comprises a shell, a lower shell, a urea pump chuck and an upper shell which are mutually fixed, the upper shell extends into the urea tank, the urea pump chuck is fixed to the urea tank, the upper shell is provided with a filter module, and the filter module is connected with the urea tank. And an injection pipe is arranged at the bottom of the lower shell. The urea pump is arranged at the bottom of the tank body of the urea tank, no liquid suction pipeline is exposed, the urea pump is integrally divided into an upper part and a lower part, the upper part is embedded into the urea tank, the lower part is located below the urea tank, the liquid suction pipeline is all integrated in the lower shell of the urea pump, the structure is compact, and the structure is compact. The bottom of the urea tank can be heated through the first heating module arranged in the upper part, the low-pressure flow channel and the high-pressure flow channel can be heated through the second heating module arranged in the lower part, and the requirement for unfreezing the urea flow channel in winter is met through the design mode.

Description

TECHNICAL FIELD

[0001] The utility model relates to the technical field of tail gas treatment, and particularly to a urea pump installed at the bottom of a urea tank. BACKGROUND

[0002] In recent years, with the continuous upgrading of China's diesel vehicle exhaust emission standards, more and more diesel vehicles have begun to use SCR systems for nitrogen oxide (NOx) emission control. The urea pump is a core component of the SCR system and is responsible for the injection and metering of urea.

[0003] The existing urea pumps on the domestic market are mostly installed separately from the urea tank. The urea pump is connected to the urea tank through a liquid suction line and a return line. The connection method is complex, occupies a large space, and the urea pipeline is often exposed externally, increasing the need for heating control of the liquid suction line and return line. This increases the complexity of the SCR system control and the hardware application cost, and there is a risk of difficulty in thawing when heating in winter, which also increases the system power consumption. SUMMARY

[0004] To solve the technical problems of the existing urea pump, the first aspect of the utility model provides a urea pump installed at the bottom of a urea tank, comprising:

[0005] a housing comprising a lower housing, a urea pump chuck, and an upper housing fixed to each other, the upper housing extending into the urea tank, the urea pump chuck being fixed to the urea tank, the upper housing being provided with a filter module, and the bottom of the lower housing being provided with a spray pipe;

[0006] a motor module arranged inside the upper housing;

[0007] a flow channel structure comprising a low-pressure flow channel and a high-pressure flow channel connected to the motor module, both arranged inside the lower housing, the low-pressure flow channel inlet being connected to the filter module, and the high-pressure flow channel outlet being connected to the spray pipe, the urea solution at the bottom of the urea tank being extracted by the motor module and sprayed out of the spray pipe;

[0008] a first heating module arranged inside the upper housing;

[0009] a second heating module arranged inside the lower housing;

[0010] The first heating module is located on the inner wall of the upper housing and surrounds the motor module, the filter module, and the low-pressure flow channel inlet portion, and is used for heating the bottom of the urea tank and the inlet of the filter module. The second heating module is arranged to surround the low-pressure flow channel and the high-pressure flow channel, and is used for heating the low-pressure flow channel and the high-pressure flow channel.

[0011] Preferably, the first heating module includes a first heat-conducting structure, a second heat-conducting structure, a first heating structure, and a second heating structure. The first heat-conducting structure surrounds the periphery of the motor module, and the second heat-conducting structure is disposed below the filter module.

[0012] Preferably, the first heat-conducting structure and the second heat-conducting structure include aluminum alloy heat-conducting structures, and the first heat-conducting structure and the second heat-conducting structure are an integral structure.

[0013] Preferably, the outer side of the first heat-conducting structure is provided with at least two grooves, and the first heating structure includes a PTC heating module disposed in the grooves.

[0014] Preferably, a groove is provided above the second heat-conducting structure, and the second heating structure is disposed in the groove.

[0015] Preferably, the inlet pipe of the low-pressure flow channel is connected to the outlet of the filter module, the outlet pipe of the low-pressure flow channel is connected to the inlet of the motor module, the inlet channel of the high-pressure flow channel is connected to the outlet of the motor module, a pressure sensor is provided on one side of the high-pressure flow channel, and the outlet of the high-pressure flow channel is provided with a flow channel outlet and an overflow outlet.

[0016] Preferably, the second heating module includes a third heating structure, a third heat-conducting structure, and a fourth heat-conducting structure, wherein the third heat-conducting structure and the fourth heat-conducting structure are integrally formed, the low-pressure flow channel is attached to the third heat-conducting structure, and the high-pressure flow channel is attached to the fourth heat-conducting structure.

[0017] Preferably, the third heating structure includes a PTC heating module, which is disposed on the side close to the fourth heat-conducting structure.

[0018] Compared with the prior art, the advantages of this utility model are:

[0019] The urea pump of this application is located at the bottom of the urea tank, with no exposed suction pipes. The urea pump is divided into two parts: the upper part is embedded inside the urea tank, and the lower part is located below the urea tank. All suction pipes are integrated into the lower housing of the urea pump, resulting in a compact structure. The bottom of the urea tank can be heated by the first heating module built into the upper part, and the low-pressure flow channel and high-pressure flow channel can be heated by the second heating module built into the lower part. This design not only meets the need for thawing the urea flow channel in winter, but also reduces system energy consumption. Attached Figure Description

[0020] The accompanying drawings are not intended to be drawn to scale. In the drawings, each identical or nearly identical component shown in the various figures may be denoted by the same reference numeral. For clarity, not every component is labeled in each figure. Embodiments of various aspects of the present invention will now be described by way of example and with reference to the accompanying drawings, wherein:

[0021] Figure 1 This is a schematic diagram of the urea pump installed at the bottom of the urea tank according to this utility model;

[0022] Figure 2 This is a schematic diagram of the urea pump installed at the bottom of the urea tank as shown in this utility model;

[0023] Figure 3 This is an exploded view of the upper shell and the first heating module shown in this utility model;

[0024] Figure 4 This is an exploded view of the lower housing and the second heating module shown in this utility model. Detailed Implementation

[0025] To better understand the technical content of this utility model, specific embodiments are provided below in conjunction with the accompanying drawings.

[0026] Combination Figure 1 and Figure 2 As shown, the first aspect of this utility model proposes a urea pump installed at the bottom of a urea tank, including a housing, a motor module 210, a flow channel structure, a first heating module 300, and a second heating module 400. The urea pump 200 is installed at the bottom of the urea tank 100, which can reduce the arrangement space, eliminate the need for exposed connecting pipes, and allow urea to flow into the urea pump inlet by its own gravity. This reduces the number of urea suction pipes and urea return pipes, thereby reducing system complexity and hardware application costs.

[0027] Combination Figure 2 As shown, the outer casing includes a lower casing 201, a urea pump chuck 202, and an upper casing 203 that are fixed to each other. The upper casing 203 extends into the urea tank 100, the urea pump chuck 202 is fixed to the urea tank 100, the upper casing 203 is provided with a filter module 204, and the bottom of the lower casing 201 is provided with a spray pipe 250.

[0028] Furthermore, the motor module 210 is located inside the upper housing 203. Optionally, the motor module 210 is a gear pump.

[0029] The flow channel structure includes a low-pressure flow channel 220 and a high-pressure flow channel 230 connected to the motor module 210, both of which are located inside the lower housing 201.

[0030] The low-pressure flow channel 220 inlet is connected to the filter module 204, and the high-pressure flow channel 230 outlet is connected to the injection pipe 250. The motor module 210 draws urea solution from the bottom of the urea tank 100 and sprays it out from the injection pipe 250.

[0031] Under the influence of gravity, the urea solution at the bottom of the urea tank 100 passes through the filter module 204 and enters the low-pressure flow channel 220. Then, the motor module 210 draws the liquid and builds up pressure before pumping it into the high-pressure flow channel 230 and spraying it out from the injection pipe 250. During this process, the urea pump and the urea tank 100 are connected only through the low-pressure flow channel 220 and the high-pressure flow channel 230, without the need for additional exposed connecting pipes. Therefore, it is only necessary to heat the low-pressure flow channel 220, the high-pressure flow channel 230, and the bottom of the urea tank 100 to maintain the reliability of urea injection at low temperatures.

[0032] Furthermore, in combination Figure 3 and Figure 4 As shown, the first heating module 300 is disposed inside the upper housing 203, and the second heating module 400 is disposed inside the lower housing 201.

[0033] The first heating module 300 is located on the inner wall of the upper housing 203 and surrounds the motor module 210 and the filter module 204 to the inlet of the low-pressure flow channel 220. It is used to heat the bottom of the urea tank 100 and the inlet of the filter module 204. The second heating module 400 is configured to surround the low-pressure flow channel 220 and the high-pressure flow channel 230 and is used to heat the low-pressure flow channel 220 and the high-pressure flow channel 230.

[0034] In an optional embodiment, a circuit board is provided inside the lower housing 201, and a connector socket 260 is provided on the outside of the lower housing 201. The circuit board supplies power to electronic components such as the motor module 210, the first heating module 300, and the second heating module 400, and controls the injection of the urea pump and the working status of the heating module through the vehicle controller.

[0035] Combination Figure 3 As shown, the first heating module 300 includes a first heat-conducting structure 310, a second heat-conducting structure 320, a first heating structure, and a second heating structure 321. The first heat-conducting structure 310 surrounds the motor module 210, and the second heat-conducting structure 320 is disposed below the filter module 204.

[0036] In a preferred embodiment, the first heat-conducting structure 310 and the second heat-conducting structure 320 include aluminum alloy heat-conducting structures, and the first heat-conducting structure 310 and the second heat-conducting structure 320 are an integral structure.

[0037] Thus, the first heat-conducting structure 310 surrounds the motor module 210 to form a ring, which can heat the urea solution around the upper housing 203 and prevent the urea solution at the bottom of the urea tank 100 from crystallizing.

[0038] In an optional embodiment, the outer side of the first heat-conducting structure 310 is provided with at least two grooves, and the first heating structure includes a PTC heating module disposed in the groove.

[0039] A large heating area can be formed by using multiple PTC heating modules arranged in the grooves and conducting heat through the first heat-conducting structure 310.

[0040] Furthermore, a groove is provided above the second heat-conducting structure 320, and the second heating structure 321 is disposed in the groove.

[0041] The second heat-conducting structure 320 is located below the filter module 204, which can heat the area where the filter module 204 is located, thus preventing the urea solution from crystallizing when passing through the filter module 204.

[0042] Combination Figure 4 As shown, the inlet pipe 221 of the low-pressure flow channel 220 is connected to the outlet of the filter module 204, the outlet pipe 222 of the low-pressure flow channel 220 is connected to the inlet of the motor module 210, the inlet channel 231 of the high-pressure flow channel 230 is connected to the outlet of the motor module 210, a pressure sensor 240 is provided on one side of the high-pressure flow channel 230, and the outlet of the high-pressure flow channel 230 is provided with a flow channel outlet 232 and an overflow outlet 233.

[0043] Thus, the flow path of the urea solution is: filter module 204 - inlet pipe 221 - low-pressure flow channel 220 - outlet pipe 222 - motor module 210 - inlet channel 231 - high-pressure flow channel 230 - flow channel outlet 232 or overflow outlet 233. All the urea flow paths are specifically heated by the second heating module 400 to ensure the reliability of urea flow.

[0044] Optionally, the second heating module 400 includes a third heating structure 430, a third heat-conducting structure 410, and a fourth heat-conducting structure 420. The third heat-conducting structure 410 and the fourth heat-conducting structure 420 are integrally formed. The low-pressure flow channel 220 is attached to the third heat-conducting structure 410, and the high-pressure flow channel 230 is attached to the fourth heat-conducting structure 420.

[0045] Thus, the third heating structure 430 generates heat, and the third heat-conducting structure 410 and the fourth heat-conducting structure 420 transfer the heat to the surrounding area of ​​the low-pressure flow channel 220 and the high-pressure flow channel 230, ensuring that the urea in the flow channel does not crystallize.

[0046] Since the low-pressure flow channel 220 extends from the filter module 204 toward the motor module 210, the low-pressure flow channel 220 can be heated by the first heating module 300. The third heating structure 430 includes a PTC heating module and is located on the side close to the fourth heat-conducting structure 420.

[0047] In this way, the high-pressure flow channel 230 can be heated by the third heating structure 430, so that the low-pressure flow channel 220 and the high-pressure flow channel 230 are heated more evenly.

[0048] In conjunction with the above embodiments, the urea pump of this application is located at the bottom of the urea tank, with no exposed suction pipes. The urea pump is divided into two parts: the upper part is embedded inside the urea tank, and the lower part is located below the urea tank. All suction pipes are integrated into the lower housing of the urea pump, resulting in a compact structure. The bottom of the urea tank can be heated by the first heating module built into the upper part, and the low-pressure flow channel and high-pressure flow channel can be heated by the second heating module built into the lower part. This design not only meets the need for thawing the urea flow channel in winter, but also reduces system energy consumption.

[0049] Although the present invention has been disclosed above with reference to preferred embodiments, it is not intended to limit the present invention. Those skilled in the art to which this invention pertains can make various modifications and refinements without departing from the spirit and scope of the present invention. Therefore, the scope of protection of this invention shall be determined by the claims.

Claims

1. A urea pump installed at the bottom of a urea tank, characterized in that, include: The outer casing includes a lower casing (201), a urea pump chuck (202), and an upper casing (203) that are fixed to each other. The upper casing (203) extends into the urea tank (100), the urea pump chuck (202) is fixed to the urea tank (100), the upper casing (203) is provided with a filter module (204), and the bottom of the lower casing (201) is provided with a spray pipe (250). The motor module (210) is disposed inside the upper housing (203); The flow channel structure includes a low-pressure flow channel (220) and a high-pressure flow channel (230) connected to the motor module (210), both of which are disposed inside the lower housing (201). The inlet of the low-pressure flow channel (220) is connected to the filter module (204), and the outlet of the high-pressure flow channel (230) is connected to the injection pipe (250). The motor module (210) draws urea solution from the bottom of the urea tank (100) and sprays it out from the injection pipe (250). The first heating module (300) is disposed inside the upper housing (203); The second heating module (400) is disposed inside the lower housing (201); The first heating module (300) is located on the inner wall of the upper housing (203) and surrounds the motor module (210) and the filter module (204) to the inlet of the low-pressure flow channel (220), and is used to heat the bottom of the urea tank (100) and the inlet of the filter module (204). The second heating module (400) is configured to surround the low-pressure flow channel (220) and the high-pressure flow channel (230), and is used to heat the low-pressure flow channel (220) and the high-pressure flow channel (230).

2. The urea pump installed at the bottom of the urea tank according to claim 1, characterized in that, The first heating module (300) includes a first heat-conducting structure (310), a second heat-conducting structure (320), a first heating structure, and a second heating structure (321). The first heat-conducting structure (310) surrounds the periphery of the motor module (210), and the second heat-conducting structure (320) is disposed below the filter module (204).

3. The urea pump installed at the bottom of the urea tank according to claim 2, characterized in that, The first heat-conducting structure (310) and the second heat-conducting structure (320) include aluminum alloy heat-conducting structures, and the first heat-conducting structure (310) and the second heat-conducting structure (320) are an integral structure.

4. The urea pump installed at the bottom of the urea tank according to claim 2, characterized in that, The outer side of the first heat-conducting structure (310) is provided with at least two grooves, and the first heating structure includes a PTC heating module disposed in the grooves.

5. The urea pump installed at the bottom of the urea tank according to claim 2, characterized in that, The second heat-conducting structure (320) has a groove on its upper part, and the second heating structure (321) is disposed in the groove.

6. The urea pump installed at the bottom of the urea tank according to claim 1, characterized in that, The inlet pipe (221) of the low-pressure flow channel (220) is connected to the outlet of the filter module (204), the outlet pipe (222) of the low-pressure flow channel (220) is connected to the inlet of the motor module (210), the inlet channel (231) of the high-pressure flow channel (230) is connected to the outlet of the motor module (210), a pressure sensor (240) is provided on one side of the high-pressure flow channel (230), and the outlet of the high-pressure flow channel (230) is provided with a flow channel outlet (232) and an overflow outlet (233).

7. The urea pump installed at the bottom of the urea tank according to claim 6, characterized in that, The second heating module (400) includes a third heating structure (430), a third heat-conducting structure (410), and a fourth heat-conducting structure (420). The third heat-conducting structure (410) and the fourth heat-conducting structure (420) are integrally formed. The low-pressure flow channel (220) is attached to the third heat-conducting structure (410), and the high-pressure flow channel (230) is attached to the fourth heat-conducting structure (420).

8. The urea pump installed at the bottom of the urea tank according to claim 7, characterized in that, The third heating structure (430) includes a PTC heating module, which is located on the side close to the fourth heat-conducting structure (420).

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