WO2018072558A1

WO2018072558A1 - Urea pump module

Info

Publication number: WO2018072558A1
Application number: PCT/CN2017/099322
Authority: WO
Inventors: 林魁; 龚超; 薛运峰
Original assignee: 天纳克（苏州）排放系统有限公司
Priority date: 2016-10-21
Filing date: 2017-08-28
Publication date: 2018-04-26
Also published as: CN107975406A; CN207178012U

Abstract

A urea pump module for mounting on a bottom portion of a urea tank, comprising: a base (1), a pump assembly (2) mounted on the base (1), and a housing assembly (3) covering the pump assembly. The base (1) is provided therein with a circuit board (131) and a urea outlet connector (116). The housing assembly comprises a housing (31) and a first heating blanket (32) in close contact with an inner side of the housing. The housing is provided with a first slot (3123) which enables a urea solution to enter. The first heating blanket (32) surrounds the periphery of the pump assembly and is connected to the circuit board. The pump assembly comprises: a pump unit (21), a pump housing (22) covering the periphery of the pump unit, a first filter (23) surrounding a bottom portion of the pump unit, and a second filter (24) located at the periphery of the first filter. Such configuration improves the effectiveness of filtering, and also prolongs the service life of a urea pump module.

Description

Urea pump module

The present application claims priority to Chinese Patent Application Serial No. No. No. No. No. No. No. No. No.

Technical field

The invention relates to a urea pump module, belonging to the technical field of engine exhaust aftertreatment.

Background technique

Conventional urea injection systems include a urea pump module that is disposed outside of the urea tank and connected by a urea tube. However, this design takes up a lot of space and is not conducive to vehicle installation.

Later, a urea pump module installed at the top of the urea tank appeared in the prior art. Although this design saves some space, it still takes up some space because the urea pump module still protrudes upward from the urea tank.

In order to better solve the above problems, a urea pump module installed at the bottom of a urea tank has appeared in the prior art. Since the concentration of 32.5% urea solution may contain other impurities, how to filter impurities, reduce wear and increase the service life of the urea pump module is a very important technical problem.

Summary of the invention

The object of the present invention is to provide a urea pump module with better filtering effect and long service life.

In order to achieve the above object, the present invention adopts the following technical solution: a urea pump module for mounting on the bottom of a urea tank, the urea pump module including a base, a pump assembly mounted on the base, and a cover on the pump a housing assembly on the assembly, wherein the base is provided with a circuit board and a urea outlet joint, the housing assembly including a housing and a first heating blanket closely abutting the inner side of the housing, the housing Providing a first slot for entering a urea solution, the first heating blanket surrounding a periphery of the pump assembly and being coupled to the circuit board; the pump assembly including a pump unit, a cover at the pump unit a peripheral pump housing, a first filter surrounding the bottom of the pump unit, and a second filter located at a periphery of the first filter, wherein the pump unit includes a urea solution for delivering the urea outlet joint And a urea pump and a pump coil for driving the urea pump and connected to the circuit board.

As a further improved technical solution of the present invention, the second filter is C-shaped, and the pump casing is provided with a recess for holding the second filter and communicating the first filter and the second filter a plurality of communication holes of the device, the communication holes running through the radial direction Pump housing.

As a further improved technical solution of the present invention, the pump unit includes a mounting plate, the pump coil is located at an upper portion of the mounting plate, the urea pump is located at a lower portion of the mounting plate, and the urea pump is provided with a urea inlet, a urea outlet and a stud that communicates with the urea outlet, the first filter surrounding a periphery of the urea pump.

As a further improved technical solution of the present invention, the first filter comprises a top wall, a bottom wall, an annular wall between the top wall and the bottom wall, and the top wall, the bottom wall and the annular wall a surrounding receiving space, wherein the top wall is provided with an opening for the urea pump to pass through, the top wall abuts the mounting plate, the urea pump is located in the receiving space, and the bottom wall is provided There are perforations for the studs to pass through.

As a further improved technical solution of the present invention, the housing is provided with a top wall and a cylindrical side wall, the top wall is provided with an opening, and the first heating blanket is closely abutted on the inner side of the side wall The first heating blanket is fixed to the side wall by a plurality of fixing elements.

As a further improvement of the technical solution of the present invention, the bottom of the side wall is provided with a plurality of first cantilevers, each of the first cantilevers is provided with a first slot; the base is provided with the first slot in the vertical direction A number of first projections at the bottom of the slot.

As a further improvement of the technical solution of the present invention, the side wall is provided with a lower edge, the base is provided with an annular groove for receiving the lower edge, and the first slot runs downward through the lower edge, each first The first slot is disposed on both sides of the cantilever, and the first cantilever is trapezoidal.

As a further improved technical solution of the present invention, the base is provided with a base body, a second heating blanket laid on the base body, and a bottom cover fixed under the seat body, wherein the base body is provided a plate-shaped portion, an annular flange that protrudes upward from the plate-like portion, and a convex portion that protrudes downward from the plate-shaped portion, the plate-shaped portion is provided with an upper surface, and the second heating blanket is laid on The upper surface is connected to the circuit board.

As a further improved technical solution of the present invention, the plate portion is provided with a through hole communicating with the urea outlet joint, the protrusion is inserted in the through hole, and the second heating blanket is surrounded by Near the through hole.

As a further improvement of the technical solution of the present invention, the upper surface of the plate portion is provided with a boss, the through hole is located in the boss, and the pump assembly at least partially fits on the boss, the first Two heating blankets surround the boss.

Compared with the prior art, the invention improves the filtering effect by setting two filters, and also increases the service life of the urea pump module.

DRAWINGS

BRIEF DESCRIPTION OF THE DRAWINGS Figure 1 is a perspective view of a urea pump module of the present invention.

Figure 2 is a perspective view of another angle of Figure 1.

Fig. 3 is a front view of Fig. 1.

Figure 4 is a rear elevational view of Figure 1.

Figure 5 is a plan view of Figure 1.

Fig. 6 is a bottom view of Fig. 1;

Figure 7 is a left side view of Figure 1.

Figure 8 is a right side view of Figure 1.

Figure 9 is a partial exploded perspective view of Figure 1 with the housing assembly separated.

Figure 10 is a perspective view of the housing assembly of Figure 9 at another angle.

Figure 11 is an exploded perspective view of Figure 10 .

Figure 12 is a further exploded perspective view of the housing assembly of Figure 9 removed.

Figure 13 is an exploded perspective view of another angle of Figure 12;

Figure 14 is a partial perspective exploded view of the pump assembly of Figure 13;

Figure 15 is a further exploded perspective view of Figure 14.

Figure 16 is an exploded perspective view of another angle of Figure 15.

Figure 17 is an exploded perspective view of another angle of Figure 16;

Figure 18 is a partially exploded perspective view of the base of Figure 12;

Figure 19 is a further exploded perspective view of Figure 18.

Figure 20 is a perspective view of the seat of Figure 19 at another angle.

Figure 21 is a cross-sectional view taken along line A-A of Figure 1.

Figure 22 is a cross-sectional view taken along line B-B of Figure 5.

Figure 23 is a cross-sectional view taken along line C-C of Figure 5.

detailed description

Referring to FIG. 1 to FIG. 23, the present invention discloses a urea pump module 100 for mounting on the bottom of a urea tank. The urea pump module 100 includes a base 1 and a pump assembly 2 mounted on the base 1. And a housing assembly 3 that is shielded on the pump assembly 2.

Referring to FIGS. 9-11, the housing assembly 3 includes a housing 31 and a first heating blanket 32 that abuts against the inside of the housing 31. In the illustrated embodiment of the invention, the housing 31 is provided with a top wall 311 and a cylindrical side wall 312. The top wall 311 is provided with an opening 3111. The opening 3111 can allow the urea solution to enter the urea pump module 100 when the urea liquid level is high; at the same time, the opening 3111 is also used to correspond to the ultrasonic probe to measure the urea liquid in the urea tank. Bit (detailed later). The bottom of the side wall 312 is provided with a plurality of first cantilevers 3121 for fastening to the base 1. Each of the first cantilevers 3121 is provided with a first slot 3122. In addition, the side wall 312 is further provided with a first slot 3123 on both sides of each of the first cantilevers 3121. The side wall 312 is provided with a lower edge 3124 that extends downward through the lower edge 3124. In the illustrated embodiment of the present invention, the first slot 3123 is V-shaped, and the first cantilever 3121 is trapezoidal. So, on the one hand, the first cantilever 3121 is formed by providing the first slot 3123; on the other hand, these first slots 3123 can enter the inlet port of the urea pump module 100 as a urea solution.

The first heating blanket 32 abuts against the inside of the side wall 312. In the illustrated embodiment of the invention, the housing 31 is made of a metallic material, and the first heating blanket 32 is a flexible heating element. In this way, the flexible heating element can better achieve the bonding with the side wall 312, thereby facilitating the transfer of heat; in addition, the flexible heating element is simple in processing and can be made thinner, thereby saving cost; and, the flexible heating element It can better adapt to the vibration of the vehicle during driving and has good reliability. In the illustrated embodiment of the invention, the first heating blanket 32 surrounds the periphery of the pump assembly 2, such that, on the one hand, heat is transferred to the housing 31 by the first heating blanket 32. The urea tank is heated; on the other hand, the urea surrounded by the first heating blanket 32 (including the urea remaining in the pump assembly 2) can also be heated in time to achieve rapid thawing.

In the illustrated embodiment of the invention, the first heating blanket 32 is secured to the side wall 312 by a plurality of fastening elements 33. In order to give way, the first heating blanket 32 is further provided with a plurality of notches 321 corresponding to the first cantilever 3121.

Referring to FIG. 12 to FIG. 20 , the base 1 is provided with a base 11 , a second heating blanket 12 laid on the base 11 , and a bottom cover 13 fixed to the lower side of the base 11 . The seat body 11 is provided with a plate portion 111, an annular flange 112 that protrudes upward from the plate portion 111, and a boss portion 113 that protrudes downward from the plate portion 111.

The plate portion 111 is provided with an upper surface 1111 and a boss 1112 located in the upper surface 1111. The boss 1112 is provided with a through hole 1113 communicating with the high pressure outlet of the pump assembly 2.

The base 1 is further provided with an annular groove 114 located outside the annular flange 112 for receiving the lower edge 3124 of the housing 31. The outer surface of the annular flange 112 is provided with a plurality of sections that are held in the vertical direction at the bottom of the first slot 3122. A protrusion 1121.

The boss portion 113 is provided with a receiving cavity 115 and a urea outlet joint 116 communicating with the through hole 1113. The base 1 is provided with an ultrasonic probe 117, a temperature sensor 118, and a pressure sensor 119 that are mounted in the housing chamber 115. The ultrasonic probe 117 is aligned upward with the opening 3111 for detecting the liquid level of the urea solution. The temperature sensor 118 also extends upward through the upper surface 1111 of the plate portion 111 for detecting the temperature of the urea solution. The pressure sensor 119 is in communication with the urea outlet fitting 116 to detect an outlet pressure of the pump assembly 2. In addition, as shown in FIG. 20, the outer surface of the convex portion 113 is further provided with a plurality of second protrusions 1131.

The second heating blanket 12 is laid on the upper surface 1111 to enable the urea in the pump assembly 2 to be heated and thawed upward. The second heating blanket 12 surrounds the through hole 1113. This is provided to enable better heating of the urea at the outlet position of the pump assembly 2. Preferably, the second heating blanket 12 is a flexible heating element. In the illustrated embodiment of the invention, the pump assembly 2 is at least partially affixed to the boss 1112 to effect a seal. The second heating blanket 12 surrounds the boss 1112.

The bottom cover 13 is provided with a circuit board 131, a receiving cavity 132 for accommodating the circuit board 131, and a waterproof ventilation cover 133 communicating with the receiving cavity 132. Since the electronic components on the circuit board 131 generate heat during operation, the air around them expands, and the waterproof venting cover 133 is provided to solve the problem of crushing the electronic components due to air expansion, and at the same time Waterproof effect.

The first heating blanket 32 and the second heating blanket 12 are both connected to the circuit board 131. In addition, the bottom cover 13 is also provided with a plurality of second cantilevers 134. Each of the second cantilevers 134 is provided with a second slot 135. The bottom cover 13 is provided with a second slot 136 on each side of each of the second cantilevers 134. The bottom cover 13 is provided with an upper edge 137, and the second slot 136 extends upward through the upper edge 137. In the illustrated embodiment of the invention, the second slot 136 is V-shaped, and the second cantilever 134 is trapezoidal. The second protrusion 1131 is held in a vertical direction on the top of the second slot 135 to hold the bottom cover 13 and the base 11 together.

Referring to FIGS. 13 to 17, the pump assembly 2 includes a pump unit 21, a pump casing 22 that is shielded around the pump unit 21, a first filter 23 that surrounds the bottom of the pump unit 21, and A second filter 24 located at the periphery of the first filter 23. In the illustrated embodiment of the invention, the pump unit 21 includes a mounting plate 211, a urea pump 212 located at a lower portion of the mounting plate 211 and configured to deliver a urea solution to the urea outlet fitting 116, and located at the The upper portion of the plate 211 is mounted and used to drive the pump coil 213 of the urea pump 212. The urea pump 212 may be a gear pump, a diaphragm pump, a plunger pump, or the like. Please refer to As shown in FIG. 21, in the illustrated embodiment of the present invention, the urea pump 212 is a gear pump, such that the gear pump has a relatively large pump pressure on the one hand, and the reverse rotation of the gear pump on the other hand. Achieve evacuation of residual urea and reduce the risk of freezing the system. The pump coil 213 is connected to the circuit board 131. The urea pump 212 is provided with a urea inlet 2121, a urea outlet, and a stud 2122 in communication with the urea outlet. The boss 2122 is sleeved with a sealing ring 2123 to enable sealing after being inserted into the through hole 1113. The first filter 23 surrounds the periphery of the urea pump 212 to filter impurities, and the urea inlet 2121 is located inside the first filter 23.

The first filter 23 includes a top wall 231, a bottom wall 232, an annular wall 233 between the top wall 231 and the bottom wall 232, and the top wall 231, the bottom wall 232, and the annular wall 233. The enclosed receiving space 234, wherein the top wall 231 is provided with an opening 2311 through which the urea pump 212 passes. The top wall 231 abuts against the mounting plate 211. The urea pump 212 is located in the receiving space 234, and the bottom wall 232 is provided with a through hole 2321 through which the stud 2122 passes. In the illustrated embodiment of the invention, the first filter 23 is a fine filter.

In the illustrated embodiment of the invention, the second filter 24 is a coarse filter. The second filter 24 is C-shaped to have a certain elasticity to facilitate installation.

The pump casing 22 is provided with a recess 221 for holding the second filter 24 and a plurality of communication holes 222 communicating with the first filter 23 and the second filter 24. The communication hole 222 radially penetrates the pump casing 222.

In use, the urea pump module 100 is mounted to the bottom of the urea tank. Preferably, the urea pump module 100 is mounted to the bottom of the urea tank. The urea solution in the urea tank enters the interior of the urea pump module 100 through the first slot 3123 on the housing 31. Of course, when the level of the urea solution is sufficiently high, the urea solution can also enter the interior of the urea pump module 100 through the opening 3111 in the housing 31. Then, the urea solution enters the urea inlet 2121 of the urea pump 212 through the second filter 24, the communication hole 222, and the first filter 23. After being pressurized by the urea pump 212, it is delivered to the urea outlet joint 116. Finally, the high pressure urea solution from the urea outlet connection 116 is delivered to the urea nozzle and injected into the exhaust of the engine through the urea nozzle to effect exhaust gas purification.

In addition, the above embodiments are only for illustrating the present invention and are not intended to limit the technical solutions described in the present invention. The understanding of the present specification should be based on those skilled in the art, although the present specification has been carried out with reference to the above embodiments. DETAILED DESCRIPTION OF THE INVENTION However, those skilled in the art should understand that the invention may be modified or equivalently replaced by those skilled in the art without departing from the spirit and scope of the invention. It is intended to be included within the scope of the appended claims.

Claims

a urea pump module for mounting to a bottom of a urea tank, the urea pump module including a base, a pump assembly mounted on the base, and a housing assembly overlying the pump assembly, wherein the base Providing a circuit board and a urea outlet joint, wherein the housing assembly comprises a housing and a first heating blanket closely abutting the inner side of the housing, the housing being provided with a urea solution a slot, the first heating blanket is wrapped around the periphery of the pump assembly and connected to the circuit board; the pump assembly includes a pump unit, a pump casing that is shielded around the pump unit, and is surrounded by a first filter at the bottom of the pump unit and a second filter at a periphery of the first filter, wherein the pump unit includes a urea pump for delivering a urea solution to the urea outlet joint and a drive A urea pump and a pump coil connected to the circuit board.
A urea pump module according to claim 1, wherein said second filter is C-shaped, said pump casing being provided with a recess for holding said second filter and communicating said first filter And a plurality of communication holes of the second filter, the communication holes radially extending through the pump casing.
A urea pump module according to claim 2, wherein said pump unit comprises a mounting plate, said pump coil is located at an upper portion of said mounting plate, said urea pump is located at a lower portion of said mounting plate, said urea The pump is provided with a urea inlet, a urea outlet, and a stud that communicates with the urea outlet, the first filter surrounding the periphery of the urea pump.
A urea pump module according to claim 3, wherein said first filter comprises a top wall, a bottom wall, an annular wall between said top wall and said bottom wall, and said top wall, a receiving space surrounded by the bottom wall and the annular wall, wherein the top wall is provided with an opening for the urea pump to pass through, the top wall abuts the mounting plate, and the urea pump is located in the receiving space The bottom wall is provided with a perforation through which the stud is passed.
A urea pump module according to claim 4, wherein said housing is provided with a top wall and a cylindrical side wall, said top wall being provided with an opening, said first heating blanket being closely abutted Inside the side wall, the first heating blanket is secured to the side wall by a plurality of fastening elements.
The urea pump module according to claim 5, wherein the bottom of the side wall is provided with a plurality of first cantilevers, each of the first cantilevers is provided with a first slot; and the base is provided with a card in a vertical direction A plurality of first protrusions held at the bottom of the first slot.
The urea pump module according to claim 6, wherein said side wall is provided with a lower edge, and said base is provided with a housing The annular groove of the lower edge, the first slot extends downwardly through the lower edge, and the first slot is disposed on both sides of each of the first cantilevers, and the first cantilever is trapezoidal.
The urea pump module according to claim 5, wherein the base is provided with a seat body, a second heating blanket laid on the seat body, and a bottom cover fixed to the lower side of the seat body, wherein The seat body is provided with a plate-shaped portion, an annular flange that protrudes upward from the plate-shaped portion, and a convex portion that protrudes downward from the plate-shaped portion, the plate-shaped portion is provided with an upper surface, the first portion Two heating blankets are laid on the upper surface and connected to the circuit board.
A urea pump module according to claim 8, wherein said plate portion is provided with a through hole communicating with said urea outlet joint, said boss being inserted in said through hole, said second A heating blanket surrounds the through hole.
The urea pump module according to claim 9, wherein the upper surface of the plate portion is provided with a boss, the through hole is located in the boss, and the pump assembly is at least partially fitted to the convex portion. On the stage, the second heating blanket surrounds the boss.