Purifying urea injection pump for tail gas discharged by national sixth diesel vehicle

Abstract

The utility model relates to the technical field of urea pumps, in particular to a urea injection pump for purifying tail gas discharged by a diesel vehicle in the national sixth level, which comprises a shell, a filter, a gear pump, a control panel and a heating component, and the filter, the gear pump, the control panel and the heating component are arranged in the shell. The shell comprises a first shell body, a second shell body and a third shell body, and the filter, the control panel and the heating component are arranged in the second shell body and the third shell body. The urea pump shell is composed of the three shell bodies, molds of the first shell body and the second shell body are not changed, different configuration requirements can be met only by modifying the third shell body or the connector socket on the third shell body, the adaptability of the molds is improved, modification is small, the replacement cost is low, and the service life of the urea pump shell is prolonged. Meanwhile, the heating part is arranged in the second shell, and on the basis that the requirement for heating the filter, the flow channel and the pump is met, the function of the heating part is not affected by replacing the third shell.

Description

TECHNICAL FIELD

[0001] The utility model relates to urea pump technical field, and specifically relates to diesel car national six emission tail gas purification urea injection pump. BACKGROUND

[0002] The diesel car national six emission tail gas purification urea injection pump, also called as urea injection pump in selective catalytic reduction (SCR) system, is a key component in the national six diesel car emission control system, and will send a command to the urea pump when the engine control system detects that it is necessary to reduce nitrogen oxides in tail gas.

[0003] The urea pump has a spray nozzle, a liquid return nozzle and a liquid suction nozzle, the liquid suction nozzle is connected with a urea tank, and its function is to suck urea solution in the urea tank into the urea pump when the urea pump is working. The function of the spray nozzle is to deliver the urea solution pressurized by the urea pump to the exhaust pipe. The spray nozzle can make the urea solution form an atomization effect, which can increase the contact area of the urea solution with the tail gas, so that the urea is rapidly decomposed into ammonia in the high-temperature tail gas, and the ammonia reacts with the nitrogen oxides in the tail gas to reduce the nitrogen oxides in the diesel car tail gas to nitrogen and water, thereby reducing the nitrogen oxides in the diesel car tail gas.

[0004] During the working process of the urea pump, in order to ensure stable system pressure and avoid damage to components due to excessive pressure, the excess urea solution will flow back to the urea tank through the liquid return nozzle. When the pressure in the urea pump reaches the set value, part of the urea solution will flow back through the liquid return nozzle, so that the pressure in the pump is maintained within a suitable range.

[0005] Among them, the connector of the urea pump is an important component for connecting the urea pump with other components (such as vehicle electronic control unit ECU, power supply, sensor, etc.) to realize current or signal transmission. However, the mold shell of the urea pump on the market is single, and the molds of different manufacturers are not the same, so the adaptability of different models of products is poor. SUMMARY

[0006] In view of the technical problems existing in the prior art urea injection pump, the utility model provides a diesel car national six emission tail gas purification urea injection pump, which comprises a shell and a filter, a gear pump, a control panel and a heating component arranged in the shell.

[0007] The shell comprises a first shell, a second shell and a third shell, the filter, the control panel and the heating component are arranged in the second shell and the third shell, the control panel is provided with a connector, the connector extends towards the third shell, and the third shell is provided with a connector socket corresponding to the connector.

[0008] The connector socket is detachably connected with the third shell.

[0009] The first shell, the second shell and the third shell are detachably connected with each other.

[0010] Preferably, the connector socket comprises a connecting part and a protection part, the connecting part is provided with four screw mounting seats, the third shell is provided with screw holes corresponding to the screw mounting seats, and the protection part is provided with a protection shell extending to the outside of the connector.

[0011] Preferably, the connector socket comprises a first socket and a second socket, and the connecting parts of the first socket and the second socket are the same.

[0012] Preferably, a sealing gasket is arranged between the connector socket and the third shell.

[0013] Preferably, the second shell is provided with a jet nozzle, a suction nozzle and a return nozzle, the jet nozzle is connected with the liquid outlet end of the gear pump, the return nozzle is communicated with the jet nozzle through a flow channel, the first end of the filter is communicated with the suction nozzle, and the second end is connected with the liquid inlet end of the gear pump.

[0014] Preferably, the heating component comprises a heating film, a sealing aluminum block and a heat preservation structure layer, the sealing aluminum block is connected to the flow channel and seals the flow channel, the heating film is arranged at corresponding positions of the filter, the sealing aluminum block and the gear pump, and is used for heating the filter, the sealing aluminum block and the gear pump, and the heat preservation structure layer is arranged on the side of the heating film, which is away from the first shell.

[0015] Preferably, the heating film comprises an electric heating wire connected to a control panel and an insulation layer surrounding the outer wall of the electric heating wire.

[0016] Preferably, the insulation layer comprises a polyimide film layer.

[0017] Preferably, a sealing ring is arranged between the sealing aluminum block and the flow channel.

[0018] Preferably, the heating film is provided with a heat conduction structure in the area corresponding to the filter, the sealing aluminum block and / or the gear pump.

[0019] Compared with the prior art, the utility model has the advantages that:

[0020] The urea pump shell provided by the utility model is composed of three shell bodies, the first shell body and the second shell body are not changed, and only the third shell body or the connector socket of the third shell body is changed to meet different configuration requirements, increase the adaptability of the mold, and change little and have low replacement cost, and the heating component is arranged in the second shell body, and the third shell body does not affect the function of the heating component on the basis of meeting the heating requirements of the filter, the flow channel and the pump. BRIEF DESCRIPTION OF DRAWINGS

[0021] The accompanying drawings are not intended to be drawn to scale. In the drawings, each identical or nearly identical component that is illustrated in various figures can be represented by a like numeral. For purposes of clarity, not every component can be called out in every drawing. There is now being described by way of example various embodiments of aspects of the present utility model, with reference to the accompanying drawings in which:

[0022] Figure 1 is a structure schematic view of the diesel vehicle national six emission tail gas purification urea injection pump shown in the utility model;

[0023] Figure 2 is a schematic view of the third shell body of the diesel vehicle national six emission tail gas purification urea injection pump shown in the utility model after being removed;

[0024] Figure 3 is a structure schematic view of the connector socket after being replaced shown in the utility model;

[0025] Figure 4 is a structure schematic view of the flow channel shown in the utility model;

[0026] Figure 5 is a structure schematic view of the sealing aluminum block covering the outside of the flow channel shown in the utility model;

[0027] Figure 6 is a structure schematic view of the heating film shown in the utility model;

[0028] Figure 7 is a structure schematic view of the heat preservation structure layer shown in the utility model. DETAILED DESCRIPTION

[0029] In order to better understand the technical content of the utility model, specific embodiments are described as follows with the aid of the accompanying drawings.

[0030] The utility model provides a kind of diesel vehicle national six emission tail gas purification urea injection pump, including shell and the filter 10, gear pump 20, control panel 30 and heating component 40 being arranged in shell.

[0031] As Figures 1-2As shown, the housing includes a first housing 101, a second housing 102 and a third housing 103. The filter 10, the control board 30 and the heating component 40 are disposed in the second housing 102 and the third housing 103. The control board 30 is provided with a connector 31, which extends toward the third housing 103. The third housing 103 is provided with connector sockets corresponding to the connector 31.

[0032] The connector socket is detachably connected to the third housing 103; the first housing 101, the second housing 102 and the third housing 103 are detachably connected to each other.

[0033] In this way, the housing is configured to be formed by splicing together the first housing 101, the second housing 102 and the third housing 103. The third housing 103 can be replaced as needed (for example, by using a gear pump 20 of a different size) or even just the connector socket can be replaced (for example, just by replacing a different connector or pump model). The entire housing does not need to be disassembled, so this urea pump has better adaptability.

[0034] In an optional embodiment, a waterproof and breathable membrane 106 is provided on the surface of the third housing 103 corresponding to the position of the gear pump 20.

[0035] In an optional embodiment, the connector socket includes a connecting portion and a protective portion. The connecting portion is configured to include four screw mounts, and the third housing 103 is provided with screw holes corresponding to the screw mounts. The protective portion is configured to include a protective shell extending to the outside of the connector 31.

[0036] Thus, depending on the different connector 31 plug forms, the protective part is set with a protective shell of different construction, while the connection part maintains the same structure and size, so different connector sockets can be replaced as needed.

[0037] In an optional embodiment, combined with Figure 3 As shown, the connector socket includes a first socket 104 and a second socket 105, and the connection portions of the first socket 104 and the second socket 105 are identical.

[0038] Thus, when replacing different connectors 31, only the connector socket needs to be replaced, and the connection parts of different connector sockets are the same, resulting in high compatibility.

[0039] Preferably, a sealing gasket is provided between the connector socket and the third housing 103. This achieves a good waterproof effect.

[0040] Combination Figure 2As shown, the second housing 102 is provided with a spray nozzle 21, a suction nozzle 22 and a return nozzle 23. The spray nozzle 21 is connected to the outlet end of the gear pump 20, and the return nozzle 23 is connected to the spray nozzle 21 through the flow channel 24. The first end of the filter 10 is connected to the suction nozzle 22, and the second end is connected to the inlet end of the gear pump 20.

[0041] Optionally, the spray nozzle 21, the suction nozzle 22, and the return nozzle 23 are connected to the second housing 102 via snap fasteners 24. The snap fasteners include two identical snap fasteners that are symmetrically distributed. The snap fasteners are provided with a snap shaft and a snap groove. The two snap fasteners are defined as a male snap fastener and a female snap fastener. When the snap shaft and the snap groove of the male snap fastener engage with each other, the male snap fastener and the female snap fastener are connected.

[0042] Furthermore, the heating component 40 includes a heating film 41, a sealing aluminum block 42, and a heat insulation structure layer 43. The sealing aluminum block 42 is connected to the flow channel 24 and seals the flow channel 24. The heating film 41 is arranged at corresponding positions of the filter 10, the sealing aluminum block 42, and the gear pump 20 for heating the filter 10, the sealing aluminum block 42, and the gear pump 20. The heat insulation structure layer 43 is disposed on the side of the heating film 41 facing the first housing 101.

[0043] When gear pump 20 needs to inject urea, gear pump 20 draws urea from urea tank through suction nozzle 22. Pressure sensor 32 is arranged in the injection channel to detect the pressure of the injection pipeline. The injection pipeline and the return pipeline are internally connected. After gear pump 20 builds up pressure, urea solution flows from filter 10 into injection nozzle 21. Excess urea flows into urea tank from return nozzle 23. Heating component 40 is used to heat the above components to prevent urea crystallization.

[0044] In an optional embodiment, the heating film 41 includes a heating wire connected to the control panel 30 and an insulating layer surrounding the outer wall of the heating wire. Preferably, the insulating layer includes a polyimide film layer.

[0045] Preferably, a sealing ring is provided between the sealing aluminum block 42 and the flow channel 24.

[0046] Furthermore, the heating film 41 is provided with a heat-conducting structure in the area corresponding to the filter 10, the sealing aluminum block 42, and / or the gear pump 20. The heat-conducting structure may be an aluminum alloy heat-conducting block 421, which is fixed to the insulation layer 43 and the heating film 41 by thermally conductive adhesive.

[0047] As described above, the heating structure is arranged inside the second housing 102 and is positioned corresponding to the filter 10, the flow channel 24 and the gear pump, which can meet the heating requirements of the above components, and the heating structure is not affected when the third housing 103 is replaced.

[0048] In conjunction with the above embodiments, the urea pump housing proposed in this utility model consists of three housing parts. The molds of the first and second housings remain unchanged. Different configuration requirements can be met by modifying the third housing or the connector socket on the third housing, which increases the adaptability of the mold, requires minimal modification, and has low replacement cost. At the same time, the heating component is set in the second housing. While meeting the heating requirements of the filter, flow channel and pump, replacing the third housing does not affect the function of the heating component.

[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 injection pump for purifying exhaust gas in diesel vehicles meeting China VI emission standards, characterized in that, It includes a housing and a filter (10), a gear pump (20), a control panel (30), and a heating element (40) disposed within the housing; The housing includes a first housing (101), a second housing (102), and a third housing (103). The filter (10), the control board (30), and the heating element (40) are disposed in the second housing (102) and the third housing (103). The control board (30) is provided with a connector (31), which extends toward the third housing (103). The third housing (103) is provided with connector sockets corresponding to the connector (31). The connector socket is detachably connected to the third housing (103); The first housing (101), the second housing (102) and the third housing (103) are detachably connected to each other.

2. The diesel vehicle China VI emission standard exhaust gas purification urea injection pump according to claim 1, characterized in that, The connector socket includes a connecting portion and a protective portion. The connecting portion is configured to include four screw mounts. The third housing (103) has screw holes corresponding to the screw mounts. The protective portion is configured to include a protective shell extending to the outside of the connector (31).

3. The diesel vehicle China VI emission standard exhaust gas purification urea injection pump according to claim 2, characterized in that, The connector socket includes a first socket (104) and a second socket (105), and the connection portions of the first socket (104) and the second socket (105) are the same.

4. The diesel vehicle China VI emission standard exhaust gas purification urea injection pump according to claim 2 or 3, characterized in that, A sealing gasket is provided between the connector socket and the third housing (103).

5. The diesel vehicle China VI emission standard exhaust gas purification urea injection pump according to claim 1, characterized in that, The second housing (102) is provided with a spray nozzle (21), a suction nozzle (22) and a return nozzle (23). The spray nozzle (21) is connected to the outlet end of the gear pump (20). The return nozzle (23) is connected to the spray nozzle (21) through a flow channel (24). The first end of the filter (10) is connected to the suction nozzle (22), and the second end is connected to the inlet end of the gear pump (20).

6. The diesel vehicle China VI emission standard exhaust gas purification urea injection pump according to claim 5, characterized in that, The heating component (40) includes a heating film (41), a sealing aluminum block (42), and a heat insulation structure layer (43). The sealing aluminum block (42) is connected to the flow channel (24) and seals the flow channel (24). The heating film (41) is arranged at the corresponding positions of the filter (10), the sealing aluminum block (42), and the gear pump (20) for heating the filter (10), the sealing aluminum block (42), and the gear pump (20). The heat insulation structure layer (43) is disposed on the side of the heating film (41) facing the first housing (101).

7. The diesel vehicle China VI emission standard exhaust gas purification urea injection pump according to claim 6, characterized in that, The heating film (41) includes a heating wire connected to the control panel (30) and an insulating layer surrounding the outer wall of the heating wire.

8. The diesel vehicle China VI emission standard exhaust gas purification urea injection pump according to claim 7, characterized in that, The insulating layer includes a polyimide film layer.

9. The diesel vehicle China VI emission standard exhaust gas purification urea injection pump according to claim 6, characterized in that, A sealing ring is provided between the sealing aluminum block (42) and the flow channel (24).

10. The diesel vehicle China VI emission standard exhaust gas purification urea injection pump according to claim 6, characterized in that, The heating film (41) has a heat-conducting structure in the area corresponding to the filter (10), the sealing aluminum block (42) and / or the gear pump (20).

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