KR102438909B1 - Electric heating type urea sender and urea tank having the same - Google Patents

Abstract

The electrothermal urea water sender is mounted in a mounting hole formed in the lower wall of the urea water tank, has a cavity formed through it, and includes a sender mounting unit provided with a connector for supplying urea water and a connector for recovering urea water, and the urea on the sender mounting unit. A heating unit including a heat dissipation plate installed so as to be immersed in the urea water of a water tank and to which heat transfer elements generated by power are installed, and a molding member sealing the heat dissipation plate from the urea water, a connector for supplying the urea water, and the element A urea water supply tube and a urea water recovery tube respectively connected to a water recovery connector and extending upward through the guide passages of the heating unit from the sender mounting unit, and installed in the cavity of the sender mounting unit, the state value of the urea water A sensor device for measuring is included.

Description

Electrothermal heating method urea water sender and urea water tank having the same

The present invention relates to a urea water sender and a urea water tank having the same. More particularly, the present invention relates to a urea water sender used in a selective catalytic reduction system and a urea water tank having the same.

As an example of an exhaust gas purification system for post-processing and purifying harmful substances included in exhaust gas of an internal combustion engine such as a diesel engine, a Selective Catalytic Reduction (SCR) system is known in the art.

A selective catalytic reduction system (hereinafter simply referred to as an 'SCR system') reduces nitrogen oxide (NOx) in exhaust gas of an internal combustion engine to nitrogen and water through a catalytic reaction using urea as a reducing agent. An aqueous solution containing urea as a reducing agent (hereinafter, simply referred to as 'urea water') is supplied to the SCR system. For this purpose, a urea water tank for storing urea water is employed in the SCR system. The urea water tank is equipped with a urea water sender that is connected to the urea water supply module of the SCR system, sends the urea water stored in the urea water tank to the SCR system, and delivers the urea water returned from the SCR system to the urea water tank.

In the conventional urea water sender, it is possible to thaw the frozen urea water in winter using engine coolant. However, defrosting can be started only after a certain period of time has elapsed after starting the engine, and additional devices for circulating the coolant are required, thereby increasing the manufacturing cost.

An object of the present invention is to provide an electrothermal heater type urea water sender having a simple structure and improved urea water defrosting performance by reducing manufacturing cost.

Another object of the present invention is to provide a urea water tank having the above-described urea water sender.

The electrothermal urea water sender according to exemplary embodiments for achieving the object of the present invention is mounted on a mounting hole formed in the lower wall of the urea water tank and has a cavity formed through it, and a connector for supplying urea and the number of urea A sender mounting unit having a connector for recovery, a heat dissipation plate installed on the sender mounting unit so as to be immersed in the urea water of the urea water tank and heated by a power source, and a molding for sealing the heat dissipation plate from the urea water A heating unit including a member, a urea water supply tube and a urea water recovery tube respectively connected to the connector for supplying urea water and the connector for recovering urea water and extending upward through the guide passages of the heating unit from the sender mounting unit, and It is installed in the cavity of the sender mounting part and includes a sensor device for measuring the state value of the urea number.

In example embodiments, the heating elements may include positive temperature coefficient (PTC) elements.

In exemplary embodiments, the heating unit includes an electrode portion to which external power is applied and the heating elements are seated, respectively, and a heating element plate including an insulating plate covering the electrode portion so that the heating elements are exposed, and The heat dissipation plate may have a slot into which the heat transfer element plate is inserted, and may be in surface contact with the heat transfer elements inserted into the slot.

In exemplary embodiments, the heat dissipation plate extends in a vertical direction on a base block disposed on the sender mounting portion, a slot block having the slot on an upper surface of the base block, and a lower surface of the base block It may include a plurality of pin blocks.

In example embodiments, the pin blocks may be spaced apart from each other along a peripheral area of the base block.

In example embodiments, a first connector pin may be provided on a lower surface of the base block, and a second connector pin may extend from the electrode unit to a lower portion of the base block to be adjacent to the first connector pin. .

In example embodiments, the distance between both sidewalls of the slot may gradually decrease toward the inside, and the heat transfer element plate may have a wedge shape corresponding to the slot shape.

In example embodiments, an angle between the outer surface of the insulating plate and the outer surface of the electrode part may be within a range of 2 to 6 degrees.

In exemplary embodiments, the sensor device may measure the concentration of urea water and the level of the water surface of the urea water.

In exemplary embodiments, the heat transfer type urea water sender is fixedly installed on the heating unit and the upper end of the urea water supply tube is fastened to a filter unit for filtering the number of urea to be supplied through the urea water supply tube. may include more.

In exemplary embodiments, the sensor device includes a window through which an ultrasonic wave for detecting the level of the water surface of the urea is scanned, and the heating unit has a first opening at a position corresponding to the window, and the The filter unit may have a second opening at a position corresponding to the window.

In example embodiments, the filter unit may include a filter structure fixed on the heating unit and a plurality of support pillars for supporting the filter structure in the filter structure.

The urea water tank for achieving another object of the present invention includes a tank body having a mounting hole formed through the lower wall, and a urea water sender that is detachably mounted to the mounting hole. The urea water sender is detachably mounted in the mounting hole and has a sender mounting part having a cavity formed through the central part, installed on the sender mounting part so as to be immersed in the urea water of the urea water tank, and having heat transfer elements that are heated by a power source. A heating unit including at least one heat transfer element plate, a heat radiation plate having a slot into which the heat transfer element plate is inserted, and a molding member sealing the heat radiation plate from the number of elements, from the sender mounting portion through the guide passages of the heating portion and a urea water supply tube and a urea water recovery tube extending upward, and a sensor device installed in the cavity of the sender mounting part to measure a state value of the urea water.

In example embodiments, the heat transfer element plate includes an electrode portion on which the heat transfer elements are seated, respectively, and an insulating plate that covers the electrode portion so that the heat transfer elements are exposed, and the heating surface of the heat transfer element is the heat dissipation plate of the slot may be in surface contact with the inner surface of the slot.

In exemplary embodiments, the heat dissipation plate extends in a vertical direction on a base block disposed on the sender mounting portion, a slot block having the slot on an upper surface of the base block, and a lower surface of the base block It may include a plurality of pin blocks.

In example embodiments, a first connector pin may be provided on a lower surface of the base block, and a second connector pin may extend from the electrode unit to a lower portion of the base block to be adjacent to the first connector pin. .

In example embodiments, the distance between both sidewalls of the slot may gradually decrease toward the inside, and the heat transfer element plate may have a wedge shape corresponding to the slot shape.

In exemplary embodiments, the sensor device may measure the concentration of urea water and the level of the water surface of the urea water.

In exemplary embodiments, the urea water sender is fixedly installed on the heating unit and the upper end of the urea water supply tube is fastened to further include a filter unit for filtering the number of urea to be supplied through the urea water supply tube can do.

In exemplary embodiments, the sensor device includes a window through which an ultrasonic wave for detecting the level of the water surface of the urea is scanned, and the heating unit has a first opening at a position corresponding to the window, and the The filter unit may have a second opening at a position corresponding to the window.

In exemplary embodiments, the heat transfer type urea water sender may include a heating unit installed on the sender mounting unit mounted on the lower wall of the urea water tank to be immersed in the urea water of the urea water tank. The heating unit may include a heat dissipation plate on which the PTC elements are installed and a molding member sealing the heat dissipation plate from the number of elements. The heat dissipation plate may have a slot into which the heat transfer element plate in which the PTC elements are seated is inserted, and an inner surface of the slot may be in surface contact with the heat generating surface of the PTC element.

Therefore, it is possible to prevent freezing of the urea water in the urea water tank and thaw the frozen urea water by using a PTC element that is not separately required by the controller instead of the conventional cooling water-related parts.

In addition, a heat transfer element plate having a plurality of the PTC elements may be assembled into a slot of the heat dissipation plate in a wedge type. Accordingly, a thermal contact area with the PTC elements is increased and assembly property is improved, thereby preventing contact failure.

Furthermore, the heat transfer type urea number sender may include an ultrasonic concentration/level sensor device installed in a cavity formed in the center of the sender mounting unit. Accordingly, since the concentration/level sensor device is welded to the cavity of the sender mounting part, it can be easily installed in the urea water tank without a separate support member.

However, the effects of the present invention are not limited to the above-mentioned effects, and may be variously expanded without departing from the spirit and scope of the present invention.

1 is a block diagram showing a selective catalytic reduction system according to exemplary embodiments.
2 is a perspective view showing a urea water tank installed with a urea water sender according to exemplary embodiments.
Figure 3 is a perspective view showing the number of urea sender of Figure 2;
4 is an exploded perspective view illustrating the urea number sender of FIG. 2 .
5 is an exploded perspective view of the bottom of the urea number sender of FIG.
6 is a cross-sectional view taken along line AA′ of FIG. 3 .
7 is a perspective view illustrating the heat dissipation plate of the heating unit of FIG. 4 .
FIG. 8 is a plan view illustrating the heat transfer element assembly inserted into the slot of the heat dissipation plate of FIG. 7 .
9 is a cross-sectional view taken along line BB′ of FIG. 8 .
10 is a cross-sectional view illustrating a heating unit into which the heat transfer element assembly of FIG. 8 is inserted.
11 is a schematic cross-sectional view illustrating the sensor device of FIG. 4 .

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings.

In each drawing of the present invention, the dimensions of the structures are enlarged than the actual size for clarity of the present invention.

In the present invention, terms such as first, second, etc. may be used to describe various elements, but the elements should not be limited by the terms. The above terms are used only for the purpose of distinguishing one component from another.

The terms used in the present invention are only used to describe specific embodiments, and are not intended to limit the present invention. The singular expression includes the plural expression unless the context clearly dictates otherwise. In the present application, terms such as “comprise” or “have” are intended to designate that a feature, number, step, operation, component, part, or combination thereof described in the specification exists, but one or more other features It is to be understood that this does not preclude the possibility of the presence or addition of numbers, steps, operations, components, parts, or combinations thereof.

With respect to the embodiments of the present invention disclosed in the text, specific structural or functional descriptions are only exemplified for the purpose of describing the embodiments of the present invention, and the embodiments of the present invention may be embodied in various forms. It should not be construed as being limited to the embodiments described in

That is, since the present invention can have various changes and can have various forms, specific embodiments are illustrated in the drawings and described in detail in the text. However, this is not intended to limit the present invention to the specific disclosed form, it should be understood to include all modifications, equivalents and substitutes included in the spirit and scope of the present invention.

1 is a block diagram showing a selective catalytic reduction system according to exemplary embodiments.

Referring to FIG. 1 , a selective catalytic reduction (SCR) system 10 is a selective catalytic reduction device 30, SCR installed in an exhaust pipe 20 through which exhaust gas from an engine (not shown) is discharged. A reducing agent injection module 40 installed in the exhaust pipe 20 in front of the device 30 to inject a reducing agent for reducing nitrogen oxides in exhaust gas, a reducing agent injection module 40 for reducing the reducing agent stored in the reducing agent storage tank 100 ) may include a reducing agent supply module 50 for supplying, and a dosing control unit 60 for controlling supply and injection of the reducing agent. In addition, the SCR system 10 may further include a diesel oxidation catalyst (DOC) device (not shown) installed in the exhaust pipe 20 in front of the SCR device 30 .

In exemplary embodiments, the SCR system 10 may be applied to a passenger vehicle, a freight vehicle, a construction machine, an agricultural machine, a ship, etc. in which an internal combustion engine is used. The internal combustion engine may include, but is not limited to, a diesel engine.

For example, the exhaust pipe 20 may be connected to an exhaust manifold of the diesel engine to discharge exhaust gas from the engine. The DOC device may oxidize carbon monoxide and hydrocarbons contained in the exhaust gas of the diesel engine. The SCR device 30 may be installed in the exhaust pipe 20 downstream of the DOC device to reduce nitrogen oxides (NO _X ).

The reducing agent injection module 40 may inject a reducing agent such as urea water in order to reduce nitrogen oxides in the exhaust gas discharged from the engine. The reducing agent injection module 40 may inject urea water into the exhaust pipe 20 in front of the SCR device 30 under the control of the dosing control unit 60 .

Since the temperature of the exhaust gas discharged from the engine is high up to several hundreds of °C, the reducing agent injected into the exhaust pipe 20 may be vaporized immediately. The vaporized reducing agent may be mixed with the exhaust gas, and the reducing agent and the nitrogen oxide may be catalytically reacted using the selective catalytic reduction device 30 to reduce the nitrogen oxide to nitrogen gas and water.

The reducing agent supply module 50 may supply urea water to the reducing agent injection module 40 through the urea water supply pipe 42 . In addition, the reducing agent supply module 50 may be connected to the urea water sender 200 installed in the urea water tank 100 through the urea water supply pipe 52 and the urea water recovery pipe 54 .

The reducing agent supply module 50 may have a pump device for sucking urea water from the urea water tank 100 and recovering the urea water to the urea water tank 100 . The pump device supplies urea water from the urea water tank 100 to the reducing agent injection module 40 through the urea water supply pipe 52 under the control of the dosing control unit 60 and supplies the remaining urea water to the urea water recovery pipe ( 54) through the urea water tank 100 can be recovered.

In exemplary embodiments, the dosing control unit 60 receives the state values of the urea water from the sensor device installed in the urea water sender 200 in the urea water tank 100 and based on the state values, the reducing agent injection module (40) and it is possible to control the operations of the reducing agent supply module (50). For example, the sensing device may measure state values related to the level of the water surface of the urea water in the urea water tank 100 , the concentration of the urea water, the temperature of the urea water, and the like.

In addition, the dosing control unit 60 may be installed in the urea water sender 200 to control the operation of the power supply unit 70 for supplying power to the electric heating elements for heating the urea water. For example, when the urea water in the urea water tank 100 starts to freeze at a temperature below the freezing point (for example, minus 11 ° C), the dosing control unit 60 controls to supply power to the electric heating elements. The urea water can be heated.

As will be described later, the urea water sender 200 is installed to be immersed in the urea water in the urea water tank 100 to supply and recover the urea water in the urea water tank 100 to the SCR system 10 . In addition, the urea water sender 200 includes a heating unit having the heat transfer elements for heating the urea water in the urea water tank 100 and a sensor device for obtaining state values of the urea water in the urea water tank 100 . Including, it is possible to improve the performance of the SCR system (10).

Hereinafter, the urea water sender will be described in detail.

2 is a perspective view showing a urea water tank installed with a urea water sender according to exemplary embodiments. Figure 3 is a perspective view showing the number of urea sender of Figure 2; 4 is an exploded perspective view illustrating the urea number sender of FIG. 2 . 5 is an exploded perspective view of the bottom of the urea number sender of FIG. 6 is a cross-sectional view taken along line A-A' of FIG. 3 . 7 is a perspective view illustrating the heat dissipation plate of the heating unit of FIG. 4 . FIG. 8 is a plan view illustrating the heat transfer element assembly inserted into the slot of the heat dissipation plate of FIG. 7 . 9 is a cross-sectional view taken along line B-B' of FIG. 8 . 10 is a cross-sectional view illustrating a heating unit into which the heat transfer element assembly of FIG. 8 is inserted. 11 is a schematic cross-sectional view illustrating the sensor device of FIG. 4 .

1 to 11 , the urea water sender 200 includes a sender mounting unit 210 , a urea water supply line 224a , a urea water recovery line 224b , a heating unit 230 and a sensor device 250 . may include In addition, the urea number sender 200 may further include a filter unit 260 .

In exemplary embodiments, the urea water sender 200 may be installed in the urea water tank 100 . The urea water sender 200 is connected to the reducing agent supply module 50, supplies the urea water stored in the urea water tank 100 to the SCR system, recovers the urea water from the SCR system, and stores it in the urea water tank 100. can The urea water sender 200 may include heat transfer elements 246 for preventing freezing of the urea water in the urea water tank 100 and thawing the frozen urea water. As will be described later, the heating element 246 may include an electric heating element such as a positive temperature coefficient (PTC) element that generates heat by an external power source. Accordingly, the urea number sender 200 may be a sender module of an electrothermal heater method.

As shown in FIG. 2 , the urea water tank 100 may include a tank body 110 having a box shape as a whole. A mounting hole 112 may be formed through the lower wall of the tank body 110 . The sender mounting part 210 of the urea water sender 200 may be detachably mounted in the mounting hole 112 of the tank body 110 .

In addition, a urea water injection hole 122 may be formed in the upper sidewall of the tank body 110 . The urea water injection hole 122 may be equipped with a plug 120 for urea water injection. The plug 120 may be detachably mounted to the urea water injection hole 122 of the tank body 110 . The position of the urea water injection hole 122 is not limited thereto, and for example, it may be located on the upper wall of the tank body 110 .

The sender mounting unit 210 may include a housing 212 mounted in the urea water injection hole 122 . The housing 212 may include an annular base plate mounted to the urea water injection hole 122 . The housing 212 may be mounted in the mounting hole 112 using a screw fastening with a packing member interposed therebetween.

A cavity 213 may be formed in a central region of the housing 212 . The cavity 213 may be formed to pass through the housing 212 . As will be described later, the sensor device 250 may be installed in the cavity 213 . The sender mounting unit 210 may serve as a support structure for supporting the sensor device 250 .

A connector 214a for supplying urea water and a connector 214b for recovering urea water may be provided in a peripheral region of the housing 212 around the cavity 213 . The urea water supply connector 214a and the urea water recovery connector 214b may penetrate the housing 212 and extend upwardly from the upper surface of the housing 212 , respectively. The urea water supply connector 214a is connected to the urea water supply pipe 52 of the reducing agent supply module 50 to serve as a supply port for supplying urea water in the urea water tank 100, and urea water cycle The accommodation connector 214b may be connected to the urea water recovery pipe 54 of the reducing agent supply module 50 to serve as a recovery port for recovering the urea water into the urea water tank 100 .

The urea water supply tube 224a may be in communication with the urea water supply connector 214a. The urea water supply tube 224a may extend upwardly from the urea water supply connector 214a and the upper end of the urea water supply tube 224a may be immersed in the urea water in the urea water tank 100 . Therefore, the urea water in the tank body 110 is supplied through the urea water supply tube 224a, the urea water supply connector 214a and the urea water supply pipe 52 by the pump device of the reducing agent supply module 50. may be transferred to the module 50 .

The urea water recovery tube 224b may communicate with the urea water recovery connector 214b. The urea water recovery tube 224b may extend upwardly from the urea water recovery connector 214b and the upper end of the urea water return tube 224b may be immersed in urea water in the urea water tank 100 . Therefore, the urea water from the reducing agent supply module 50 is transferred to the urea water recovery pipe 54, the urea water recovery connector 214b and the urea water recovery tube 224b by the pump device of the reducing agent supply module 50. It can be returned to the inside of the tank body 110 through the.

In example embodiments, the heating unit 230 may be disposed on the sender mounting unit 210 . The heating unit 230 may be fixed by at least one support member 218 extending upwardly from the sender mounting unit 210 . The support member 218 having a pillar shape may extend upwardly from the peripheral region of the housing 212 around the cavity 213 and be inserted into the fixing hole 238 formed in the heating unit 230 and then fixed by welding.

The urea water supply tube 224a and the urea water recovery tube 224b may extend upward from the sender mounting unit 210 through the guide passages 237 formed through the heating unit 230 . Guide passages 237 may be respectively provided in the outer region of the heating unit 230 to correspond to the urea water supply tube (224a) and the urea water recovery tube (224b). The urea water supply tube 224a and the urea water recovery tube 224b may extend inside the guide passages 237 . The guide passage 237 passes through the heating part 237 and may have the shape of a groove in which the outer part is opened to the outside. The shape of the guide passage is not limited thereto, and the guide passage is provided in various forms in the outer region of the heating unit 230 adjacent to the urea water supply tube and the urea water recovery tube to provide the urea water supply tube and the urea water supply tube. It may allow the urea water recovery tube to extend upward through the heating unit 230 .

The upper ends of the urea water supply tube 224a and the urea water recovery tube 224b protrude from the top through the guide passages 237 of the heating unit 230 and can be immersed in the urea water in the urea water tank 100 . . The central portions of the urea water supply tube 224a and the urea water recovery tube 224b may be respectively located in the guide passages 237 of the heating unit 230 . Therefore, it is possible to prevent freezing of the urea water in the urea water supply tube (224a) and the urea water recovery tube (224b) and thaw the frozen urea water.

7 to 10 , the heating unit 230 includes at least one heating element plate 240 having the heating elements 246 that are heated by power, and a slot into which the heating element plate 240 is inserted. It may include a heat dissipation plate 232 having a 234 and a molding member 233 sealing the heat dissipation plate 232 from urea water.

7, the heat dissipation plate 232 is a base block 232a, a slot block 232b having a slot 234 into which the heat transfer element plate 240 is inserted on the upper surface of the base block 232a. and a plurality of pin blocks 232c extending in a vertical direction on the lower surface of the base block 232a. The base block 232a may have a disk shape corresponding to the sender mounting unit 210 . The fin blocks 232c may be spaced apart from each other along the peripheral area of the base block 232a in order to increase a thermal contact area with the number of elements. For example, the base block 232a and the pin blocks 232c may be integrally formed with each other.

The heat dissipation plate 232 may serve as a first electrode for supplying power to the heating surface of the heat transfer element 246 . A first connector pin 235 is installed on the lower surface of the base block 232a of the heat dissipation plate 232 , and the heat dissipation plate 232 is electrically connected to the power supply unit 70 by the first connector pin 235 . can For example, the heat dissipation plate 232 may include a metal material such as aluminum or copper.

The heat transfer element plate 240 may be inserted into the slot 234 of the heat dissipation plate 232 . For example, six heat transfer elements 246 may be disposed on the heat transfer element plate 240 . However, it will be understood that the number of the heating elements is not limited thereto.

Specifically, the heating element plate 240 includes an electrode part 242 on which the heating elements 246 are seated, respectively, and an insulating plate 244 surrounding the electrode part 242 such that the heating elements 246 are exposed. can do. The insulating plate 244 may define a seating groove 245 exposing a portion of the electrode part 242 , and the heating element 246 may be seated on the electrode part 242 in the seating groove 245 . The first surface of the heat transfer element 246 is in surface contact with the electrode part 242 , the second surface of the heat transfer element 246 exposed by the insulating plate 244 and opposing the first surface, that is, the heating surface is It may be in surface contact with the inner surface of the slot 234 .

The electrode part 242 may serve as a second electrode for supplying power to the first surface of the heating element 246 . A second connector pin 243 may extend above the electrode part 242 , and the electrode part 242 may be electrically connected to the power supply part 70 by the second connector pin 243 . For example, the electrode part 242 may include copper. The heating element plate 240 may be formed by plastic injection molding using the electrode part 242 in the form of a copper plate.

In example embodiments, the heating element 246 may include a PTC element. The PTC device may include, for example, a material such as a barium titanate-based (BaTiO ₃ ) semiconductor, and may be a semiconductor device using a property of rapidly increasing electrical resistance when the temperature increases. Since the heater performance of the heat transfer element 246 is determined according to the degree of adhesion to the heat dissipation plate 232 , the heat transfer element plate 240 may have a wedge-type assembly structure in order to achieve maximum adhesion.

The heating element plate 240 may have a wedge shape. The outer surface 244a of the insulating plate 244 may be inclined at a preset angle θ with respect to the outer surface of the electrode part 242 . For example, the angle θ of the outer surface 244a of the insulating plate 244 with respect to the outer surface of the electrode part 242 may be within a range of 2 degrees to 6 degrees. The thickness of the heating element plate 240 may gradually decrease along the extending direction.

As shown in FIG. 10 , a distance between both sidewalls of the slot 234 may gradually decrease toward the inside in correspondence to the wedge shape of the heat transfer element plate 240 . The heat transfer element plate 240 having a wedge shape may be inserted into the slot 234 of the heat dissipation plate 232 . Accordingly, between the first surface of the heating element 246 and the electrode portion 242 and between the second surface of the heating element 246 opposite to the first surface, that is, between the heating surface and the inner surface of the slot 234 . By increasing the contact area and contact force of the PTC device, assembling property of the PTC device may be improved and contact failure may be prevented.

The molding member 233 may seal the heat dissipation plate 232 from urea water. The molding member 233 may include a plastic material having excellent thermal conductivity in order to transfer heat from the heat dissipation plate 232 to urea water. The molding member 233 may include a thermally conductive resin formed by plastic injection molding.

Accordingly, the heating unit 230 may include a thermally conductive molding member 233 coated with a grid-shaped heat dissipation plate 232 and a heat dissipation plate 232 of an aluminum material having excellent thermal conductivity and having corrosion resistance and electrical insulation properties. have. Since the heat dissipation plate 232 and the molding member 233 contain a material having a relatively good thermal conductivity, the heating support 230 effectively prevents the freezing of the urea water in the urea water tank 100 and removes the frozen urea water. It can be defrosted efficiently.

5 , the first and second connector pins 235 and 243 may be disposed to be exposed from the lower surface of the molding member 233 . In addition, the exposed connector pins 235 and 243 may be exposed from the lower surface of the housing 212 of the sender mounting unit 210 to be electrically connected to the first and second power cables of the power supply unit 70 .

In exemplary embodiments, the filter unit 260 may be disposed on the heating unit 230 to filter the number of urea to be supplied through the urea water supply tube (224a). The filter unit 260 may communicate with the upper end of the urea water supply tube 224a extending upward through the guide passage 237 of the heating unit 230 . The filter unit 260 may be fixed on the upper surface of the molding member 233 . The filter unit 260 may include a semicircular filter structure 262 and a plurality of support pillars 264 supporting the filter structure in the filter structure 262 .

The upper end of the urea water supply tube 224a may be inserted and fixed into the filter structure 262 and positioned inside the filter structure 262 . Accordingly, the urea water supply tube 224a may supply the filtered urea water through the filter structure 262 by suction.

In example embodiments, the sensor device 250 may be fixedly installed in the cavity 213 of the housing 212 of the sender mounting unit 210 . The sensor device 250 may be welded into the cavity 213 of the housing 212 . A connector 251 for power supply and signal transmission may be provided under the sensor device 250 . The connector 251 may be exposed to the outside of the tank body 110 from the lower surface of the housing 212 . The connector 251 may include a power cable and a CAN communication cable.

11 , the sensor device 250 may detect state values of the urea water in the urea water tank 100 . For example, the sensor device 250 may measure the concentration of urea water and the level of sleep of the urea water as the state values.

The sensor device 250 may include a sensor housing 252 installed in the cavity 213 of the housing 212 to be immersed in urea water. A first sensor unit (Primary Transducer) 254a for measuring the concentration of urea water and a second sensor unit (Secondary Transducer) 254b for measuring the level of the water surface of the sensor housing 252 are disposed below the sensor housing 252. can be

At least two reflecting plates 256 are disposed on the base plate of the sensor housing 252 , and the first sensor unit 254a transmits the ultrasonic waves scanned from the oscillation unit through the swash plate 255 by the two reflecting plates 256 . By measuring the reflected return times, the concentration value of the urea water inside the sensor housing 252 can be calculated. Using the reciprocating time and reciprocating distance of the ultrasonic wave to calculate the speed of the ultrasonic, it is possible to calculate the concentration value of the urea water through a table for the speed for each concentration of the urea water. Noise can be removed by using two reflectors.

A window 253 is formed on the upper portion of the sensor housing 252 , and the second sensor unit 254b measures the time when the ultrasonic waves vertically scanned from the oscillation unit are reflected from the surface of the urea water through the window 253 and returned. Thus, it is possible to calculate the level of sleep of urea water.

A heating unit 230 and a filter unit 260 may be sequentially disposed on the sensor device 250 . The heating unit 230 may have a first opening 236 at a position corresponding to the window 253 , and the filter unit 260 may have a second opening 263 at a position corresponding to the window 253 . have. Accordingly, the ultrasonic wave scanned through the window 253 of the sensor device 250 may be irradiated to the surface of the urea water through the first and second openings 236 and 263 .

As described above, the urea water sender 200 is installed on the sender mounting part 210 mounted on the lower wall of the urea water tank 100 to be immersed in the urea water of the urea water tank 100, and the PTC elements ( It may include a heating unit 230 including a heat dissipation plate 232 on which 246 is installed and a molding member 233 sealing the heat dissipation plate 232 from the urea water. The heat dissipation plate 232 has a slot 234 in which the heat transfer element plate 240 on which the PTC elements 246 are seated is inserted, and the inner surface of the slot 234 is the heating surface and the surface of the PTC element 246 . can be contacted

Therefore, it is possible to prevent freezing of the urea water in the urea water tank 100 and to thaw the frozen urea water by using a PTC element that is not separately required by the controller instead of the conventional cooling water-related parts.

In addition, the heat transfer element plate 240 having the plurality of PTC elements 246 may be assembled into the slot 234 of the heat dissipation plate 232 in a wedge type. Accordingly, a thermal contact area with the PTC elements 246 is increased and assembly property is improved, thereby preventing contact failure.

Although the above has been described with reference to the embodiments of the present invention, those skilled in the art can variously modify and change the present invention within the scope without departing from the spirit and scope of the present invention described in the claims below. You will understand that you can.

10: selective catalytic reduction system 20: exhaust pipe
30: selective catalytic reduction device 40: reducing agent injection module
50: reducing agent supply module 52: urea water supply pipe
54: urea water recovery pipe 60: dosing control unit
70: power supply 100: urea water tank
110: tank body 112: mounting hole
120: plug 122: urea water injection hole
200: urea number sender 210: sender mounting part
212: housing 213: cavity
214a: urea water supply connector 214b: urea water recovery connector
218: support member 224a: urea water supply tube
224b: urea water recovery tube 230: heating unit
232: heat dissipation plate 232a: base block
232b: slot block 232c: pin block
233: molding member 234: slot
235: first connector pin 236: first opening
237: guide passage 238: fixing hole
240: heating element plate 242: electrode part
243: second connector pin 244: insulating plate
246: electrothermal element 250: sensor device
251: Connector for power supply and signal transmission
252: sensor housing 253: window
254a: first sensor unit 254b: second sensor unit
255: inclined plate 256: reflector
260: filter unit 262: filter structure
263: second opening 264: support pillar

Claims (20)

a sender mounting unit mounted in a mounting hole formed in the lower wall of the urea water tank, having a cavity formed therethrough, and provided with a connector for supplying urea water and a connector for recovering urea water;
a heating unit installed on the sender mounting unit to be immersed in the urea water of the urea water tank and including a heat dissipation plate on which heat transfer elements generated by power are installed and a molding member sealing the heat dissipation plate from the urea water;
a urea water supply tube and a urea water recovery tube respectively connected to the urea water supply connector and the urea water recovery connector, and extend upward through the guide passages of the heating unit from the sender mounting part; and
and a sensor device installed in the cavity of the sender mounting unit and configured to measure a state value of the urea water. According to claim 1, wherein the heat transfer element is an electrothermal element number sender including PTC (Positive Temperature Coefficient) elements. According to claim 1, wherein the heating unit comprises a heating element plate to which external power is applied, and an electrode portion on which the heating elements are seated, respectively, and an insulating plate covering the electrode portion so that the heating elements are exposed,
The heat dissipation plate has a slot into which the heat transfer element plate is inserted and is in surface contact with the heat transfer elements inserted into the slot. According to claim 3, wherein the heat dissipation plate is a base block disposed on the sender mounting portion, a slot block having the slot on an upper surface of the base block, and a plurality of vertically extending on a lower surface of the base block Electrothermal element count sender with pin blocks. [Claim 5] The sender of claim 4, wherein the fin blocks are spaced apart from each other along a peripheral area of the base block. [Claim 5] The sender of claim 4, wherein a first connector pin is provided on a lower surface of the base block, and a second connector pin extends from the electrode part to a lower part of the base block. [4] The sender of claim 3, wherein the distance between both sidewalls of the slot gradually decreases toward the inside, and the heat transfer element plate has a wedge shape corresponding to the slot shape. The heat transfer type urea number sender according to claim 3, wherein the angle between the outer surface of the insulating plate and the outer surface of the electrode part is within the range of 2 to 6 degrees. According to claim 1, wherein the sensor device is an electrothermal urea water sender for measuring the concentration of the urea water and the level of the water surface of the urea water. The method of claim 1,
The heat transfer type urea water sender further comprising a filter unit fixedly installed on the heating unit and coupled to the upper end of the urea water supply tube to filter the number of urea to be supplied through the urea water supply tube. The method of claim 10, wherein the sensor device has a window through which an ultrasonic wave for detecting the level of the water surface of the urea is scanned, the heating unit has a first opening at a position corresponding to the window, and the filter unit An electrothermal urea water sender having a second opening at a position corresponding to the window. The heat transfer type urea number sender according to claim 10, wherein the filter unit includes a filter structure fixed on the heating unit and a plurality of support pillars for supporting the filter structure inside the filter structure. a tank body having a mounting hole formed through the lower wall; and
It includes a urea number sender that is detachably mounted in the mounting hole,
The urea number sender,
a sender mounting unit detachably mounted in the mounting hole and having a cavity formed through a central portion;
At least one heat transfer element plate installed on the sender mounting part to be immersed in the urea water of the tank body and having heat transfer elements heated by a power source, a heat radiation plate having a slot into which the heat transfer element plate is inserted, and the heat radiation plate A heating unit including a molding member for sealing the urea water;
a urea water supply tube and a urea water recovery tube extending upward from the sender mounting unit through the guide passages of the heating unit; and
The urea water tank is installed in the cavity of the sender mounting part, and includes a sensor device for measuring the state value of the urea water. 14. The method of claim 13, wherein the heat transfer element plate comprises an electrode portion on which the heat transfer elements are seated, respectively, and an insulating plate covering the electrode portion so that the heat transfer elements are exposed,
The heating surface of the heat transfer element is in surface contact with the inner surface of the slot of the heat dissipation plate. 15. The method of claim 14, wherein the heat dissipation plate is a base block disposed on the sender mounting portion, a slot block having the slot on the upper surface of the base block, and a plurality of vertically extending on the lower surface of the base block Urea water tank with pin blocks. The urea water tank according to claim 15, wherein a first connector pin is provided on a lower surface of the base block, and a second connector pin extends from the electrode part to a lower part of the base block. 15. The urea water tank according to claim 14, wherein the distance between both sidewalls of the slot gradually decreases toward the inside, and the heat transfer element plate has a wedge shape corresponding to the slot shape. The urea water tank according to claim 13, wherein the sensor device measures the concentration of the urea water and the level of the water surface of the urea water. 14. The method of claim 13, wherein the urea water sender is fixed on the heating unit and the upper end of the urea water supply tube is fastened, further comprising a filter unit for filtering the number of urea to be supplied through the urea water supply tube urea tank. The method of claim 19, wherein the sensor device includes a window through which ultrasonic waves are scanned for detecting the level of the water surface of the urea water, the heating unit has a first opening at a position corresponding to the window, and the filter unit A urea water tank having a second opening at a position corresponding to the window.

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