KR101777851B1

KR101777851B1 - a Pump Module

Info

Publication number: KR101777851B1
Application number: KR1020160032380A
Authority: KR
Inventors: 황용택; 전찬요; 이국재; 조부현
Original assignee: 현담산업 주식회사
Priority date: 2016-03-17
Filing date: 2016-03-17
Publication date: 2017-09-13

Abstract

The present invention relates to a pump module provided in a urea solution tank filled with a certain amount of urea solution, and the urea solution supplied to an exhaust line where exhaust gas is discharged, comprising: a mounting flange fixedly installed to close a mounting hole formed through a bottom surface of the urea solution tank; a pump portion provided with an inlet through which the urea solution is introduced, and an outlet communicatively connected to a discharge portion formed on the mounting flange and providing a pumping force to discharge the urea solution out of the urea solution tank; a filter portion connected to the mounting flange on a lower portion end, surrounding the pump portion, and filtering the urea solution introduced into the pump portion; a filter cover portion connected to an upper portion end of the filter portion, and covering an upper portion of the filter portion which surrounds the pump portion; and an absorption portion disposed between the filter cover portion and the pump portion, and absorbing a volume expansion force of the urea solution generated when the urea solution is frozen.

Description

A pump module

The present invention relates to a pump module for pumping and supplying an aqueous urea aqueous solution which is a reducing agent to an exhaust pipe.

In general, the exhaust system of a diesel engine is equipped with an exhaust gas post-treatment device such as Selective Catalyst Reduction (SCR), Diesel Oxidation Catalyst (DOC), Catalyzed Particulate Filter (CPF) and the like to reduce nitrogen oxides Respectively.

Among them, an exhaust gas after-treatment apparatus (hereinafter referred to as "SCR apparatus") to which SCR is applied functions to reduce a nitrogen oxide in the exhaust gas to nitrogen and oxygen by injecting a reducing agent such as urea aqueous solution into the exhaust pipe .

That is, when the reducing agent is injected into the exhaust pipe of the SCR apparatus, the reducing agent is converted into ammonia (NH ₃ ) by the heat of the exhaust gas, and nitrogen oxide as a catalytic reaction of nitrogen oxide and ammonia in the exhaust gas by the SCR catalyst It can be reduced to nitrogen gas (N ₂ ) and water (H ₂ O).

Thus, in order to inject the urea aqueous solution into the inside of the exhaust pipe through the SCR device, a urea aqueous solution supply system is required to supply the urea aqueous solution to the SCR device.

This urea aqueous solution supply system basically comprises an element tank for storing the urea aqueous solution and a pump module for constituting the urea tank and supplying the urea aqueous solution to the SCR apparatus.

On the other hand, in the conventional pump module of the urine aqueous solution supply system, the urea water tank in which the urea aqueous solution is received under the freezing temperature condition during the winter season, or the freezing or thawing of the urea water in the pump module for discharging the urea aqueous solution to the outside of the tank by the pumping power Freezing phenomenon may occur.

Further, the volume of the inside of the module is expanded by freezing of the urea aqueous solution filled in the inside of the pump module, and deformation and breakage of the pump module are caused due to the internal pressure generation due to the volume expansion.

SUMMARY OF THE INVENTION Accordingly, the present invention has been made keeping in mind the above problems occurring in the prior art, and it is an object of the present invention to provide a method for absorbing volumetric expansion occurring during icing of urea water tank filled in a winter urea water tank or pump module, To thereby prevent the parts from being damaged.

It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory and are not restrictive of the invention, unless further departing from the spirit and scope of the invention as defined by the appended claims. It will be possible.

As a specific means for accomplishing the above object, a preferred embodiment of the present invention is a pump module provided in a urea water tank filled with a certain amount of urea aqueous solution to supply urea aqueous solution to an exhaust line through which exhaust gas is discharged, A mounting flange fixedly installed to close a mounting hole formed through the bottom surface of the urea water tank; A pump portion communicating with a discharge portion formed in the mounting flange to provide a pumping force for discharging urea aqueous solution to the outside of the urea water tank; A filter unit connected to a lower end of the mounting flange to surround the pump unit and filter the urea water flowing into the pump unit; A filter lid part connected to an upper end of the filter part to cover an upper portion of the filter part surrounding the pump part; And an absorption part disposed between the filter lid part and the pump part for absorbing the volume expansion force of the urea aqueous solution generated upon freezing of the urea aqueous solution, wherein the absorption part includes a fixed bar extending from the lower surface of the filter lid part, Wherein the absorber has a first incision so that a protruding portion of a fixed cover, which is assembled to an upper portion of the pump portion, is correspondingly inserted and disposed in a body corresponding to the pump portion, And a disposing portion.

Further, in a preferred embodiment of the present invention, a pump module is provided in a urea water tank filled with a predetermined amount of urea water solution and supplies an aqueous urea water solution to an exhaust line through which exhaust gas is discharged, A mounting flange fixedly installed to close a mounting hole penetrating through the mounting flange; A pump unit for providing an pumping force for discharging the urea aqueous solution to the outside of the urea water tank by providing an inlet port through which the urea aqueous solution is introduced and a discharge port communicating with the discharge port formed in the mounting flange; A filter unit connected to a lower end of the mounting flange to surround the pump unit and filter the urea water flowing into the pump unit; A filter lid part connected to an upper end of the filter part to cover an upper portion of the filter part surrounding the pump part; And an absorption part disposed between the filter lid part and the pump part for absorbing the volume expansion force of the urea aqueous solution generated upon freezing of the urea aqueous solution, wherein the absorption part includes a fixed bar extending from the lower surface of the filter lid part, Wherein the absorber comprises a second incision arrangement section formed so as to be in contact with an outer surface of the sensor arrangement tube extending a certain length from the lower surface of the filter lid section, Wherein the pump module comprises:

At this time, the absorber may be made of a water-resistant EPDM rubber material (ethylene propylene diene monomer (M-class) rubber).

In this case, the first incision part may include an auxiliary incision part that is cut out so that the connection plate connected to the first plug of the fixed cover is inserted correspondingly.

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At this time, the absorber may be formed to have an outer diameter that is spaced apart from the inner surface of the filter portion and spaced apart from the outer surface.

At this time, the volume ratio of the absorber to the number of urea to be filled in the mounting flange, the filter portion and the filter cover portion may be 10 to 15%.

At this time, the absorber is formed of an elastic body, and the absorber can elastically contract to correspond to a decaying amount of expansion of the urea water filled in the mounting flange, the filter unit and the filter lid unit.

In this case, the mounting flange includes a flange portion which is tightly fixed to the outer surface of the urea water tank through a sealing member, and a lower surface of the flange portion is connected to a discharge port of the pump portion, As shown in Fig.

The discharge unit may include a vertical first discharge pipe connected to the discharge port of the pump unit and a second discharge pipe connected to the lower end of the first discharge pipe in the middle of the length to discharge the urea aqueous solution to the outside of the tank.

In this case, the second discharge pipe may include a pressure sensor for sensing the pressure of the urea aqueous solution discharged through the discharge portion at one end thereof.

At this time, the second discharge pipe may include an internal partition wall formed through a discharge hole of a predetermined size in the middle of the length.

In this case, the mounting flange may include a lower flange portion that is assembled to a lower portion of the flange portion so as to form an internal space in which the pressure sensor is disposed.

In this case, the discharge port may include a constant length connection pipe inserted into the first discharge pipe of the discharge unit and connected to the discharge pipe.

The heater unit includes the inlet port and the outlet port. The heater unit includes a first heater member that surrounds an outer surface of a pumping motor member that generates a pumping force when power is applied, And a second heater member surrounding the outer surface of the first discharge pipe of the discharge unit connected to the discharge port.

The fixing cover includes a cylindrical body that is opened downward to cover the upper portion of the pump unit and the heater unit. The pumping motor is connected to the pumping unit, A first plug electrically connected to the heater and connected to the external power source, and a second plug electrically connected to the heater and connected to the external power source.

At this time, the first plug can be correspondingly inserted and sealed and assembled into the inside of the first elongated straight pipe extending from the upper surface of the mounting flange to a certain height.

At this time, the second plug may be assembled and sealed to correspond to the mounting hole formed through the upper surface of the mounting flange.

In this case, the fixed cover may include an engaging hole that is resiliently engaged with an elastic piece formed at an upper end of a plurality of vertical ribs extending a predetermined height from an upper surface of the mounting flange.

The plurality of coupling holes formed in the filter fixing ring may include a plurality of coupling holes formed on the outer surface of the coupling ring provided on the upper surface of the mounting flange, It can be resiliently assembled with the jaw.

The present invention as described above has the following effects.

(1) By arranging the absorption part in the filter lid part and the pump part for fixing the filter part, it is possible to absorb the stress caused by the freezing of the urea aqueous solution during the winter season or the volumetric expansion caused by icing, Can be ensured.

(2) Strongly basic aqueous urea solution can be stably pumped to the injector, and a large number of parts can be arranged in a limited space.

(3) The filter unit is provided with a filter on the side surface thereof. When the vehicle tilts, that is, when the urea aqueous solution naturally flows, the particulates can be filtered evenly through the filter medium.

(3) It is formed as a cylindrical filter portion to ensure a uniform fluid inflow path, thereby preventing a differential pressure and improving the inflow speed.

(4) Deformation due to volume expansion after thawing can be prevented, the strength of the filter part itself can be increased, and the fluid inflow path can be widened to effectively collect foreign matter.

1 is an overall perspective view showing a pump module according to a preferred embodiment of the present invention.
2 is an exploded perspective view showing a pump module according to a preferred embodiment of the present invention.
3 is a cross-sectional perspective view illustrating a pump module according to a preferred embodiment of the present invention.
FIG. 4 illustrates a filter lid and an absorber employed in a pump module according to a preferred embodiment of the present invention,
(a) is an exploded perspective view,
(b) is an assembled perspective view,
(c) is a bottom view.
5 is a schematic view showing a urea water supply system applied to a pump module exhaust system according to a preferred embodiment of the present invention.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings, which will be readily apparent to those skilled in the art to which the present invention pertains. The present invention may be embodied in many different forms and is not limited to the embodiments described herein. In order to clearly illustrate the present invention, parts not related to the description are omitted, and the same or similar components are denoted by the same reference numerals throughout the specification.

In this specification, the terms "comprises" or "having" and the like refer to the presence of stated features, integers, steps, operations, elements, components, or combinations thereof, But do not preclude the presence or addition of one or more other features, integers, steps, operations, components, parts, or combinations thereof. Also, where a section such as a layer, a film, an area, a plate, or the like is referred to as being "on" another section, it includes not only the case where it is "directly on" another part but also the case where there is another part in between. On the contrary, where a section such as a layer, a film, an area, a plate, etc. is referred to as being "under" another section, this includes not only the case where the section is "directly underneath"

1 to 5, a pump module 100 according to a preferred embodiment of the present invention is provided in a urea water tank 2 filled with a predetermined amount of urea aqueous solution to supply an aqueous urea aqueous solution as a reducing agent to exhaust gas A filter unit 130, a filter lid unit 140, and an absorption unit 150 so as to be able to supply the exhaust gas to the exhaust line through which exhaust gas is discharged.

1 to 3, the mounting flange 110 is a flange structure that is fixedly installed to close a mounting hole formed through a bottom surface of a urea water tank filled with a predetermined amount of aqueous urea water as a reducing agent.

A part of the module including the pump part 120 is disposed inside the urea water tank 2 by the mounting flange 110 so that the urea aqueous solution is forcedly sucked by the pumping force of the pump part, A part of the body is exposed to the outside of the urea water tank 2 so that the urea aqueous solution forcedly sucked by the pump part can be injected into the exhaust pipe through the ejector connected to the supply line.

The mounting flange 110 includes a plate-like flange portion 111 fixedly attached to the outer surface of the urea water tank through a sealing member. The flange portion has a bottom surface communicating with the discharge port of the pump portion 120 And a discharge part 112 for discharging the aqueous urea water solution forcedly sucked to the outside.

The discharge unit 112 includes a vertical first discharge pipe 113 connected to the discharge port 122 of the pump unit 120 and a lower end of the first discharge pipe communicatively connected to the middle of the length, And a second discharge pipe 114 for discharging the gas.

A pressure sensor 115 is provided at one end of the second discharge pipe 114 to detect the pressure of the urea aqueous solution discharged through the discharge unit. The pressure sensor 115 is connected to the outside of the tank The pressure of the urea aqueous solution can be feedback controlled in real time by comparing the actual pressure of the urea aqueous solution discharged and the target pressure with each other.

The second discharge pipe 114 is horizontally disposed with respect to the first discharge pipe 113 vertically connected to the discharge port of the pump unit and the discharge pipe 112 is discharged to the middle of the length of the second discharge pipe 114 And an internal partition wall 114b formed through the discharge hole 114a having a predetermined size so that the urea aqueous solution can be temporarily stored on the pressure sensor side and then discharged to the outside.

The mounting flange 110 includes a lower flange portion 116 assembled to a lower portion of the flange portion 111 so as to form an internal space in which the pressure sensor 115 is disposed, May include a cable outlet hole 111a through which a cable electrically connected to the pressure sensor is drawn out.

The second exhaust pipe 114 is connected to an injector 202 installed in an exhaust pipe 204 through which exhaust gas is discharged via a supply line 201 having one end connected to an outlet end of the second exhaust pipe 114, The aqueous solution can be injected into the exhaust pipe 204 and supplied.

That is, as shown in FIG. 5, the urea water supply system, which is a reductant injection system provided in the engine, is filled with urea aqueous solution, which is a reducing agent, in the urea water tank 2, (201) provides a passage for supplying the urea aqueous solution from the urea water tank (2) to the injector (202).

The exhaust sensor 16 and the temperature sensor 17 provided in the exhaust pipe 204 are electrically connected to the urea water control unit 14 and the urea water control unit 14 controls the air / Based on signals from the exhaust sensor 16 and the temperature sensor 17, stably injects a positive urea aqueous solution set in the exhaust pipe 204. [

In the converter 203 of the exhaust pipe, a reduction reaction is performed in which the nitrogen oxide contained in the exhaust gas is converted into nitrogen and water by using the urea water UREA which is the reducing agent injected from the injector 202.

1 to 3, the pump unit 120 includes at least one inlet 121 for forcibly introducing urea water into the urea water tank 2 as a reducing agent, And at least one discharge port (122) communicating with the discharge portion (112) formed in the urea water tank (110) to provide a pumping force for discharging urea water, which is a reducing agent filled in the urea water tank (2), to the outside of the urea water tank do.

The pump unit 120 forcibly flows the urea aqueous solution into the interior of the pump unit 120 through the inlet 121 and then discharges the exhaust unit 112 connected to the discharge port 122 to the outside of the tank And a pumping motor member 120a for providing a pumping force of a predetermined intensity.

The inlet port 121 and the outlet port 122 are preferably formed on a lower surface of the pumping motor member 120a facing the mounting flange 110. The outlet port 122 is formed on the lower surface of the pumping motor member 120a, And a connection pipe 122a which is inserted into the discharge pipe 113 and extends to a predetermined length so as to be communicated with the connection pipe 122a.

The heater unit 125 includes an inlet and an outlet. The heater unit 125 may include a pump for generating a pumping force when the power is applied, and a heater unit 125 for supplying heat generated when the power is applied to the pump unit 120. [ And a second heater member 125b surrounding the outer surface of the first discharge pipe 113 of the discharge unit 112 connected to the discharge port 122. The first heater member 125a surrounds the outer surface of the motor member, .

Here, the urea aqueous solution to be filled in the urea water tank is an aqueous solution which is colorless, odorless, nontoxic, nonflammable, strongly basic (pH 10 or more) and mixed with water at a ratio of 32.5%, and the freezing point of the strongly basic aqueous urea solution -11.5 degrees, and the volume at the freezing point can expand by about 5 to 11%.

Accordingly, during the winter season when the atmospheric temperature falls below zero, the pumping motor member 120a and the discharge portion 112 are directly or indirectly heated by heat generated during operation of the first and second heater members 125a and 125b Since the urea aqueous solution in the tank can be maintained at room temperature, freezing or freezing of the urea water in the inside of the pump module or the inside of the pipe module can be prevented during the winter season. As a result, the aqueous urea aqueous solution can be stabilized without clogging by freezing or freezing .

The fixing part may include a fixing cover 128 for fixing the pump part 120 coupled to the heater part 125 substantially vertically to the upper surface of the mounting flange 110.

As shown in FIGS. 2 and 3, the fixed cover 128 comprises a cylindrical body opened downward to cover the pump unit 120 and the upper portion of the heater unit 125, and the pumping motor member A first plug 128a electrically connected to the pumping motor member to supply external power to the heater unit 120a and a second plug 128a electrically connected to the heater unit to supply external power to the heater unit 125, 128b.

The first plug 128a corresponds to the inside of the first elongated straight pipe 118a extending from the upper surface of the flange portion 111 of the mounting flange 110 at a predetermined height so that the urea aqueous solution can not easily flow into the inside of the first plug 128a. And the outer surface of the first plug can be sealed to the inner surface of the first elongated tube through the sealing material.

The second plug 128b is assembled to the mounting hole 118b formed in the upper surface of the flange portion 111 of the mounting flange 110 and the outer surface of the second plug 128b And can be sealed on the inner surface of the mounting hole.

The fixing cover 128 includes an engaging hole 129 which is elastically engaged with an elastic piece 119a formed at the upper end of a plurality of vertical ribs 119 extending from the upper surface of the flange portion of the mounting flange 110, . &Lt; / RTI >

The heater part 125 arranged to enclose the outer surface of the pump part by the connection between the fixed cover 128 and the vertical rib 119 is connected to the upper part of the mounting flange 110 together with the pump part 120. [ And at the same time, the pump unit can be stably fixed in position so that the pump unit is not separated from and removed from the mounting flange by an external force.

The filter unit 130 is connected at its lower end to the mounting flange so as to surround the pump unit 120 to pump the urea aqueous solution of the urea water tank to the outside of the tank, The foreign matter can be removed by filtering the urea water.

The filter unit 130 includes a hollow cylindrical body that surrounds the pump unit including the heater unit 125 at a predetermined interval. Thus, when the urea aqueous solution is forcedly sucked through the inlet, As the aqueous solution passes, the foreign matter may be filtered.

And a plurality of coupling holes 135a formed on the outer side of the filter fixing ring 135 are formed on the flange of the mounting flange 110, And a plurality of coupling protrusions 117a protruding from the outer surface of the coupling ring 117 provided on the upper surface of the support portion 111.

Accordingly, the filter unit 130 can be fixed to the upper portion of the mounting flange so as to surround the pump unit at a predetermined interval by the coupling between the filter fixing ring and the ring to be coupled, The replacement of the filter unit with a new one by a simple operation of separating the filter retaining ring from the ring to be engaged can be easily performed.

Here, the filter unit 130 is illustrated as being a hollow cylindrical filtration medium having no corrugation on its outer surface. However, the filter unit 130 is not limited thereto and may be formed on the outer surface so as to increase the filtration area in contact with the urea aqueous solution And a filter member formed with a wrinkle portion.

Meanwhile, the filter unit may be formed of a porous material formed to increase the size of the pores toward the outer side, and the pore size may be determined according to the heating temperature.

The total filtration area of this filter part is more than 490 cm ² and the flow rate can be increased to 39.0 L / min when the pressure difference between two points is 1 Psi. At this time, the filter portion may be in the form of a hollow cylinder and a surface having a predetermined thickness.

At this time, the filter material of the filter unit applied to the preferred embodiment of the present invention is formed to have a thickness of 4 mm to 35 mm, and the fine particles of 30 μm or more are preferably applied as a material capable of filtration of 99.9% or more.

The filter lid 140 may be a substantially disk-shaped lid plate that is connected to an upper end of the filter unit and covers an open upper portion of the filter unit that surrounds the pump unit.

The filter cover 140 includes a sensor arrangement pipe 144 extending to a lower portion of the filter cover 140 so as to open the upper and lower ends thereof. And the lower end may be correspondingly coupled to the second extended elongated straight pipe 118c which is extended from the upper surface of the flange portion at a predetermined height.

Accordingly, by arranging the level sensor inside the sensor arrangement tube 144 in which the bottom surface is sealed and the urea aqueous solution is filled, the level of the urea aqueous solution filled in the urea water tank can be measured in real time to confirm the replenishment timing .

At this time, the upper end of the filter unit is integrally coupled to the lower surface of the filter lid unit 140 by a heat fusion method. However, the present invention is not limited to this, And a coupling hole provided on the outer side of the filter fixing ring is elastically assembled with a coupling jaw of another coupling ring provided on a lower surface of the filter lid part.

The absorption part 150 is disposed between the filter lid part and the pump part to absorb the expanded volumetric portion of the aqueous urea solution which is bulged to about 5 to 11% during freezing of the urea water. At this time, basically, the moisture content absorbed by the absorption portion may be about 1%.

The absorber 150 may include an absorber 151 formed through a fixing hole 152 corresponding to a fixed bar 142 extending from the lower surface of the filter cover 140 by a predetermined length.

The absorber 151 absorbs stress generated during freezing of the urea water solution filled in the urea water tank or the filter portion of the pump module or volume expansion due to freezing, thereby causing the component parts of the pump module to be damaged (Ethylene-propylene diene monomer (M-class) rubber).

The absorber 151 is provided with a first incision arrangement part 153 in which a fixed cover 128 to be assembled to the upper part of the pump part 120 is inserted into the body corresponding to the pump part 120, And the first cutout portion 153 is formed with a protruding portion 128d protruding from the upper surface of the fixed cover 128 so as to correspond to the first cutout portion 128d, And an auxiliary cut-out portion 153a, which is cut out to the outside, can be provided.

The absorber 151 includes a second incision section 154 that is cut outward so as to be in contact with the outer surface of the sensor array tube 144 extending from the lower surface of the filter lid section 140 by a predetermined length .

The absorber 151 may have an outer diameter smaller than an inner diameter of the filter unit such that the outer surface of the absorber 151 is spaced apart from the inner surface of the filter unit by a predetermined distance.

Accordingly, by absorbing the stress generated by the urea aqueous solution which is expanded in volume by about 5 to 11% while freezing or freezing the winter season urea aqueous solution by using the absorber 151, And the filter cover can be prevented from being broken.

The absorber 151 is preferably made of a rubber material having a volumetric expansion coefficient corresponding to the volumetric expansion coefficient of the aqueous urea solution which is expanded by about 5 to 11% by volume during freezing or icing. On the entire outer surface of the absorber, A coating layer having a predetermined thickness may be formed to prevent the aqueous solution from being absorbed and frozen.

Table 1 below shows a method of preparing a plurality of containers having an internal capacity of a predetermined size and filling the plurality of containers with only the number of the elements without the absorber or varying the volume ratio of the absorber to the urea, And the number of urea in the container was frozen.

The change in outer diameter of the container before and after freezing and the amount of expansion in the longitudinal direction of the container were measured.

The inner volume of the container was 1.2 L, and the absorber filled with EPDM sponge rubber material having various volume ratios in addition to urea water was used in the container. At this time, the container is not limited to any material as long as the outer diameter and the length can be changed even when a small stress is changed. This is to easily grasp the change due to the stress of the absorber. In addition, the volume ratio of the absorber to the number of urea can be determined in consideration of 1%, which is the content of the absorber to absorb the urea water.

1.2ℓ container standard For the number of elements
Absorber
Volume ratio
(%) Outside diameter and lengthwise expansion after freezing (mm) division Absorber
Volume (ℓ) Urea water volume
(l)
(Considering 10% absorption rate) division
Outer diameter Length Prize medium Ha One 0.000 1.200 0.00 Before freezing 91.27 91.33 91.14 After freezing 90.78 90.81 90.68 > 20 Difference -0.49 -0.52 -0.46 2 0.055 1.151 4.78 Before freezing 91.02 90.96 91.0 After freezing 90.56 90.61 90.68 8.12 Difference -0.46 -0.35 -0.32 3 0.078 1.130 6.90 Before freezing 91.09 91.02 91.03 After freezing 91.10 91.53 91.02 7.06 Difference 0.01 0.51 -0.01 4 0.100 1.110 9.01 Before freezing 90.97 90.92 90.96 After freezing 91.33 91.95 90.98 6.23 Difference 0.36 1.03 0.02 5 0.120 1.092 10.99 Before freezing 90.89 90.91 90.88 After freezing 90.91 91.19 91.03 3.49 Difference 0.02 0.28 0.15 6 0.139 1.075 12.90 Before freezing 90.95 91.06 91.36 After freezing 91.75 92.41 91.51 3.53 Difference 0.85 1.35 0.15

As a result of the experiment shown in Table 1, in the case of the container having the volume ratio of the absorber to the No. 1 vessel and the urea water filled in only the urea number of 4.78 to 9.01, the change of the outer diameter of the vessel was not large, but the expansion amount in the longitudinal direction was 6 mm or more, It can be seen that the volume expansion in the longitudinal direction is relatively small in the vessels No. 5 and No. 6 having a volume ratio of 10.99 to 12.93.

At this time, when the volume ratios of the absorber to the number of urea bodies were 0%, 4.78%, 6.90%, 9.01%, 10.99%, and 12.90%, the length changes of the first to sixth vessels were 20 mm or more, 8.12 mm, 7.06 mm, mm, 3.49 mm, and 3.53 mm. At this time, the difference in length change between the first container and the second container is 11.98 mm, the difference in length change between the second container and the third container is 1.06 mm, the difference in length between the third container and the fourth container is 0.83 mm , The difference in length change between the fourth container and the fifth container is 2.74 mm, and the difference in length change between the fifth container and the sixth container is 0.04 mm. That is, when the volume ratio of the absorber to the number of urea is 10% or more, it can be confirmed that the change of the length of the vessel with the change of the volume ratio is very small.

Accordingly, it is necessary to apply an absorber for relieving the stress of the components in the pump module due to the volume expansion including the outer diameter and the length when the urea water filled in the winter season pump module is iced, and the volume ratio of the absorber to the urea water is 10% The stress of the internal parts of the pump module may be relieved. At this time, if the volume ratio of the absorber is too large, the amount of urea water that can be introduced into the pump module is reduced, so it is desirable to set the volume ratio of the absorber to about 10 to 15% of the space inside the pump module.

At this time, the absorber is made of an elastic body and is contracted correspondingly to absorb the expanded volume due to the volume expansion amount of about 5 to 11%, which occurs when the urea water is iced, Stress can be relieved.

It will be apparent to those skilled in the art that various modifications and variations can be made in the present invention without departing from the spirit or scope of the inventions. It will be apparent to those of ordinary skill in the art.

2: urea water tank
110: Mounting flange
111: flange portion
112:
113: First discharge pipe
114: Second discharge pipe
120: pump section
121: inlet
122:
125:
128: Fixed cover
130:
140: Filter cover
144: Sensor arrangement tube
150: absorption part
151: absorber
153: first incision placement section
154: second incision section

Claims

1. A pump module provided in an urea water tank filled with a predetermined amount of urea aqueous solution to supply urea aqueous solution to an exhaust line through which exhaust gas is discharged,
A mounting flange fixedly installed to close a mounting hole formed through the bottom surface of the urea water tank;
A pump unit for providing an pumping force for discharging the urea aqueous solution to the outside of the urea water tank by providing an inlet port through which the urea aqueous solution is introduced and a discharge port communicating with the discharge port formed in the mounting flange;
A filter unit connected to a lower end of the mounting flange to surround the pump unit and filter the urea water flowing into the pump unit;
A filter lid part connected to an upper end of the filter part to cover an upper portion of the filter part surrounding the pump part; And
And an absorption part disposed between the filter lid part and the pump part for absorbing the volume expansion force of the urea aqueous solution generated upon freezing of the urea aqueous solution,
Wherein the absorber includes an absorber formed through a fixing hole which is fixedly coupled with a fixed bar extending from the lower surface of the filter lid part by a predetermined length,
Wherein the absorber includes a first incision providing portion formed in an opening of the body corresponding to the pump portion, the incision portion having a protruding portion corresponding to a fixed cover to be assembled on the upper portion of the pump portion.

1. A pump module provided in an urea water tank filled with a predetermined amount of urea aqueous solution to supply urea aqueous solution to an exhaust line through which exhaust gas is discharged,
A mounting flange fixedly installed to close a mounting hole formed through the bottom surface of the urea water tank;
A pump unit for providing an pumping force for discharging the urea aqueous solution to the outside of the urea water tank by providing an inlet port through which the urea aqueous solution is introduced and a discharge port communicating with the discharge port formed in the mounting flange;
A filter unit connected to a lower end of the mounting flange to surround the pump unit and filter the urea water flowing into the pump unit;
A filter lid part connected to an upper end of the filter part to cover an upper portion of the filter part surrounding the pump part; And
And an absorption part disposed between the filter lid part and the pump part for absorbing the volume expansion force of the urea aqueous solution generated upon freezing of the urea aqueous solution,
Wherein the absorber includes an absorber formed through a fixing hole which is fixedly coupled with a fixed bar extending from the lower surface of the filter lid part by a predetermined length,
Wherein the absorber includes a second incision portion formed so as to be in contact with an outer surface of the sensor arrangement tube extending a certain length from the lower surface of the filter lid portion.

3. The method according to claim 1 or 2,
Wherein the absorber is made of a water-resistant EPDM rubber (ethylene propylene diene monomer (M-class) rubber).

delete

The method according to claim 1,
Wherein the first incision portion includes an auxiliary incision portion that is cut outward so that a connection plate connected to the first plug of the fixed cover is inserted correspondingly.

delete

3. The method according to claim 1 or 2,
Wherein the absorber has an outer diameter that is spaced apart from an inner surface of the filter unit by a predetermined distance.

3. The method according to claim 1 or 2,
Wherein the volume ratio of the absorber to the number of urea to be filled in the mounting flange, filter portion and filter lid portion is 10 to 15%.

3. The method according to claim 1 or 2,
Wherein the absorbent body is formed of an elastic body, and the absorbent shrinks correspondingly to a decaying amount of expansion of the urea water filled in the mounting flange, the filter unit and the filter lid unit.

3. The method according to claim 1 or 2,
Wherein the mounting flange includes a flange portion which is tightly fixed to an outer surface of the urea water tank through a sealing member, and a lower surface of the flange portion is communicated with a discharge port of the pump portion to discharge an aqueous urea aqueous solution And a discharge part for discharging the fluid.

3. The method according to claim 1 or 2,
Wherein the discharge portion includes a vertical first discharge pipe connected to a discharge port of the pump portion and a second discharge pipe connected to the lower end of the first discharge pipe in the middle of the length to discharge the urea aqueous solution to the outside of the tank. module.

12. The method of claim 11,
Wherein the second discharge pipe includes a pressure sensor for sensing a pressure of the urea aqueous solution discharged through the discharge portion at one end thereof.

12. The method of claim 11,
Wherein the second discharge pipe includes an internal partition wall formed through a discharge hole having a predetermined size in the middle of the length.

13. The method of claim 12,
Wherein the mounting flange includes a flange portion which is tightly fixed to an outer surface of the urea water tank through a sealing member and a lower flange portion that is assembled to a lower portion of the flange portion so as to form an inner space for disposing the pressure sensor The pump module comprising:

3. The method according to claim 1 or 2,
And the discharge port includes a fixed length connection pipe correspondingly inserted into the first discharge pipe of the discharge unit and communicated with each other.

3. The method according to claim 1 or 2,
And a heater unit for transmitting heat generated when power is applied to the pump unit,
The heater unit includes a first heater member having the inlet and the outlet and enclosing an outer surface of a pumping motor member that generates a pumping force when power is applied, and a second heater surrounding the outer surface of the first outlet tube, Wherein the pump module comprises:

3. The method according to claim 1 or 2,
And a heater unit for transmitting heat generated when power is applied to the pump unit,
And a fixed cover for fixing the pump unit coupled to the heater unit to the mounting flange,
A first plug electrically connected to a pumping motor member for generating a pumping force when the power is applied and connected to an external power source; And a second plug electrically connected to the heater unit and connected to an external power source.

18. The method of claim 17,
Wherein the first plug is correspondingly inserted and sealed into the interior of a first elongated straight pipe extending a certain height from the upper surface of the mounting flange.

18. The method of claim 17,
And the second plug is assembled and hermetically assembled to the mounting hole formed in the upper surface of the mounting flange.

18. The method of claim 17,
Wherein the fixed cover includes an engaging hole that is resiliently engaged with an elastic piece formed at an upper end of a plurality of vertical ribs extending a certain height from an upper surface of the mounting flange.

3. The method according to claim 1 or 2,
And a filter fixing ring into which a lower end of the filter unit is fitted,
Wherein a plurality of coupling holes formed in the filter fixing ring are elastically assembled with a plurality of coupling jaws protruding from an outer surface of a coupling ring provided on an upper surface of the mounting flange.