KR20220079342A - Electric heating type urea sender and urea tank having the same - Google Patents

Abstract

The electrothermal urea water sender includes a sender mounting unit mounted in a mounting hole formed in an upper wall of a urea water tank and provided with a urea water supply connector and a urea water recovery connector, and at least one supporting member extending downward from the sender mounting unit. A heating support including a heating part installed so as to be immersed in the urea water of the urea water tank and heat-transferring elements generated by a power source are installed and a molding member sealing the heating part from the urea water, the urea water supply connector and a urea water supply tube and a urea water recovery tube respectively connected to the connector for urea water recovery, extending downward from the sender mounting part, and having lower ends disposed in the heating support part, and installed in the heating support part, the state value of the urea water a sensor device for measuring

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 purifying by post-processing 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 upper wall of the urea water tank and includes a urea water supply connector and a urea water recovery connector. a sender mounting unit, a heating unit installed to be immersed in the urea water of the urea water tank by at least one supporting member extending downward from the sender mounting unit, and a heating unit in which heat transfer elements generated by power are installed, and the heating unit is the urea water A heating support unit including a molding member for sealing from It is installed in the water recovery tube, and the heating support includes a sensor device for measuring the state value of the urea water.

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

In exemplary embodiments, the heating unit includes at least one heating element plate including an electrode portion on which external power is applied and on which the heating elements are seated, and an insulating plate covering the electrode portion so that the heating elements are exposed, and a heat dissipation plate having a slot into which the heat transfer element plate is inserted and in surface contact with the heat transfer element inserted into the slot.

In example embodiments, the heat dissipation plate may include a vertical heat dissipation block having the slot and extending in a vertical direction, and a horizontal heat dissipation block extending in a horizontal direction from the vertical heat dissipation block.

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 degrees 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 support member includes first and second protective tubes that extend downward from the sender mounting part and are respectively coupled to the heating support, and the first and second protective tubes have a second protective tube inside. The first and second power cables may be respectively disposed.

In exemplary embodiments, the urea water supply tube includes an inner urea water supply pipe for sucking and supplying urea water in the urea water tank, a heating wire extending in a coil shape along the circumference of the inner urea water supply pipe, and the It may include an inner urea water supply pipe and an outer protective tube that insulates and seals the heating wire from the outside.

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

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

The urea water tank according to exemplary embodiments for achieving another object of the present invention includes a tank body having a mounting hole formed through the upper wall, and a urea water sender that is detachably mounted to the mounting hole. The urea water sender is installed so as to be immersed in the urea water of the urea water tank by a sender mounting part detachably mounted to the mounting hole, and at least one support member extending downward from the sender mounting part, and generates heat by power. A heating support comprising at least one heat transfer element plate having heat transfer elements that become It extends and includes a urea water supply tube and a urea water recovery tube disposed on the heating support part, and a sensor device installed on the heating support part to measure the state value of the urea water.

In exemplary 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 a heating surface of the heat transfer element is the heat dissipation plate may be in surface contact with the inner surface of the slit.

In example embodiments, the heat dissipation plate may include a first heat dissipation block having the slit and a second heat dissipation block extending from the first heat dissipation block in a horizontal direction.

In example embodiments, a first connector pin may be provided on an upper surface of the second heat dissipation block, and a second connector pin may be provided on an upper surface of the electrode unit.

In example embodiments, the support member includes first and second protection tubes extending downward from the sender mounting part and respectively coupled to the first heat dissipation block, and inside the first and second protection tubes. First and second power cables may be disposed on the , respectively, and the first and second power cables may be electrically connected to the first and second connector pins.

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 urea water supply tube is an inner urea water supply pipe for sucking and supplying urea water in the urea water tank, a heating wire extending in a coil shape along the circumference of the inner urea water supply pipe, and the inner It may include an outer protective tube for insulating and sealing the urea water supply pipe and the heating wire from the outside.

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 support and the lower 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 urea water sender is installed so as to be immersed in the urea water of the urea water tank by at least one support member extending downward from the sender mounting part, and the heating part and the heating part in which the heat transfer elements are installed. It may include a heating support including a molding member that seals from the urea water. The heating unit may include at least one heat transfer element plate on which the PTC elements as the heat transfer elements are seated, and a heat dissipation plate on which the heat transfer element assembly is inserted. The heat dissipation plate may have a slot into which the heat transfer element assembly 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 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, a heat transfer element plate having a plurality of the PTC elements may be assembled into the 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 urea water supply tube includes an inner urea water supply pipe for sucking and supplying urea water in the urea water tank, a heating wire extending in a coil shape along the circumference of the inner urea water supply pipe, and the inner urea water supply pipe and the heating wire It may include an outer protective tube that insulates and seals from the outside. Accordingly, the heating wire may prevent the freezing of the urea water in the urea water in the inner urea water supply pipe and thaw the frozen urea water.

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 a bottom perspective view showing tubes and power lines connected to the sender mounting part of the urea number sender of FIG. 2 .
5 is a perspective view illustrating a heating support unit and a sensor device of the urea water sender of FIG. 2 .
6 is a cross-sectional view taken along line II′ of FIG. 5 .
7 is a perspective view illustrating a heat dissipation plate of the heating support of FIG. 5 .
8 is a perspective view illustrating a heating element assembly inserted into a slot of the heat dissipation plate of FIG. 7 .
9 is a front view illustrating the heat dissipation element assembly of FIG. 8 .
FIG. 10 is a cross-sectional view taken along line II-II' of FIG. 9 .
11 is an enlarged cross-sectional view illustrating a portion A of FIG. 6 .
12 is a perspective view illustrating a filter mounted on the heating support of FIG. 5 .
13 is a schematic cross-sectional view illustrating the sensor device of FIG. 5 .

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 a combination thereof described in the specification exists, but one or more other features It should be understood that this does not preclude the existence 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 and the text 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 is mixed with the exhaust gas, and the reducing agent and the nitrogen oxide are 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 to supply 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 (eg, minus 11 ° C), the dosing control unit 60 controls to supply power to the electric heating elements. The urea water can be heated.

In addition, the dosing control unit 60 is installed in the urea water sensor 200 can control the operation of the power supply unit 70 for supplying power to the heat transfer line installed in the urea water supply tube for supplying the urea water. For example, when the urea water in the urea water supply tube in the urea water tank 100 starts not being frozen, the dosing control unit 60 controls to supply power to the heat transfer line to heat the urea water in the urea water supply tube. can

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 electric heating 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 Thus, the performance of the SCR system 10 can be improved.

Hereinafter, the urea water sensor 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 a bottom perspective view showing tubes and power lines connected to the sender mounting part of the urea water sender of FIG. 2 . 5 is a perspective view illustrating a heating support unit and a sensor device of the urea water sender of FIG. 2 . 6 is a cross-sectional view taken along line A-A' of FIG. 5 . 7 is a perspective view illustrating a heat dissipation plate of the heating support of FIG. 5 . 8 is a perspective view illustrating the heat transfer element assembly inserted into the slot of the heat dissipation plate of FIG. 7 . 9 is a front view illustrating the heat dissipation element assembly of FIG. 8 . FIG. 10 is a cross-sectional view taken along line B-B' of FIG. 9 . 11 is an enlarged cross-sectional view illustrating a portion A of FIG. 6 . 12 is a perspective view showing the first and second insertion holes formed in the upper rear end of the heating support of FIG. 13 is a perspective view illustrating a filter mounted on the heating support of FIG. 5 . 14 is a schematic cross-sectional view illustrating the sensor device of FIG. 5 .

1 to 13, the urea water sender 200 includes a sender mounting part 210, a urea water supply tube 224a, a urea water recovery tube 224b, a heating support part 230 and a sensor device 250. may include

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 water 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 an overall rectangular parallelepiped shape. A mounting hole 112 may be formed through the upper 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 wall of the tank body 110 . A plug 120 for urea water injection may be mounted in the urea water injection hole 122 . The plug 120 may be detachably mounted to the urea water injection hole 122 of the tank body 110 . The location of the urea water injection hole 122 is not limited thereto, and for example, it may be located on the side wall of the tank body 110 .

The sender mounting unit 210 may include a housing 212 mounted to the urea water injection hole 122 . The housing 212 may include a disk-shaped base mounted in the urea water injection hole 122 , and a urea water supply connector 214a and a urea water recovery connector 214b provided in the base. The base of the housing 212 may be mounted to the mounting hole 112 using a screw fastening with a packing member interposed therebetween.

In addition, the housing 212 may further include a connector 216 for power supply and signal transmission provided in the base. The housing 212 may be provided with an air vent pipe 218 communicating the inside and the outside of the tank body 110 .

The urea water supply connector 214a is connected to the urea water supply pipe 52 of the reducing agent supply module 50, and the urea water recovery connector 214b is connected to the urea water recovery pipe 54 of the reducing agent supply module 50 and can be connected

The urea water supply tube 224a may extend downward from the sender mounting part 210 and the lower end of the urea water supply tube 224a may be immersed in the urea water in the urea water tank 100 . The urea water supply tube 224a may be coupled with the urea water supply connector 214a. Therefore, the urea water inside the tank body 110 is the urea water supply tube 224a, the urea water supply connector 214a and the urea water supply pipe 52 by the pump device 56 of the reducing agent supply module 50. It may be delivered to the reducing agent supply module 50 through.

The urea water recovery tube 224b may extend downward from the sender mounting unit 210 and the lower end of the urea water return tube 224b may be immersed in the urea water in the urea water tank 100 . The urea water recovery tube 224b may be connected to the urea water recovery connector 214b. 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 56 of the reducing agent supply module 50. ) through the tank body 110 may be returned to the inside.

In exemplary embodiments, the heating support 230 may be installed to be immersed into the urea water of the urea water tank 100 by at least one support member extending downward from the sender mounting unit 210 . The lower ends of the urea water supply tube 224a and the urea water return tube 224b may be disposed on the heating support 230 . The heating support 230 includes at least one heat transfer element plate 240 having heat transfer elements 246 that are heated by a power source, a heat dissipation plate 232 having a slot 234 into which the heat transfer element plate 240 is inserted, and It may include a molding member 233 sealing the heat dissipation plate 232 from the urea water.

3 and 4 , the heating support 230 may be supported by the sender mounting part 210 by the first and second protective tubes 222a and 222b as the support members. The first and second protection tubes 222a and 222b may extend downward from the sender mounting unit 210 to be coupled to the heating support unit 230 , respectively.

The first power cable 223a may be disposed inside the first protection tube 222a and the second power cable 223b may be disposed inside the second protection tube 222b. The first and second protection tubes 222a and 222b serve to insulate and seal the first and second power cables 223a and 223b for supplying power to the PCT element 246 from the outside, as will be described later. can be performed. Upper ends of the first and second power cables 223a and 223b may be respectively connected to pins of the power supply connector 216 of the sender mounting unit 210 . For example, the first and second protection tubes 222a and 222b may include a metal material such as stainless steel having corrosion resistance to urea water.

The urea water supply tube 224a may include an inner urea water supply pipe 225a, a heating wire 225b and an outer protection tube 225c. The lower end of the inner urea water supply pipe 225a is disposed on the heating support 230 to be immersed in the urea water in the urea water tank 100 . The upper end of the inner urea water supply pipe 225a communicates with the urea water supply connector 214a of the sender mounting unit 210 to be connected to the urea water supply pipe 52 of the reducing agent supply module 50 . The heating wire 225b may extend in a coil shape along the circumference of the inner urea water supply pipe 225a. It may be connected to a pin of the power supply connector 216 of the sender mounting unit 210 .

Accordingly, the heating wire 225b may prevent the freezing of the urea water of the urea water in the inner urea water supply pipe 225a and thaw the frozen urea water. The outer protection tube 225c may insulate and seal the inner urea water supply pipe 225a and the heating wire 225b from the outside.

At least a portion of the urea water recovery tube (224b) may extend to contact the urea water supply tube (224a). The urea water recovery tube 224b may be fixed to the urea water supply tube 224a by a fixing clip 228 . Accordingly, it is possible to receive heat from the urea water supply tube 224a having the heating wire 225b to prevent freezing of the urea water in the urea water recovery tube 224b and to thaw the frozen urea water.

As shown in FIGS. 5 to 7 , the heating support 230 may include a heating part in which the heat transfer elements 246 are installed and a molding member 233 sealing the heating part from urea water. In addition, the sensor device 250 may be installed on the upper surface of the heating support (230). The heating support 230 may serve as a support structure for supporting the sensor device 250 .

The heating unit may include at least one heat transfer element plate 240 on which the heat transfer elements 246 are seated, and a heat dissipation plate 232 on which the heat transfer element plate 240 is inserted. The heat dissipation plate 232 has a slot 234 into which the heat transfer element plate 240 is inserted, and one surface of the slot 234 may be in surface contact with the heat generating surface of the heat transfer element 246 .

The heat dissipation plate 232 has a slot 234 and extends in the horizontal direction (X direction) from the vertical heat dissipation block 232a as a first heat dissipation block and the vertical heat dissipation block 232a extending in the vertical direction (Z direction). It may include a horizontal heat dissipation block 232b as two heat dissipation blocks. The slot 234 may extend in the vertical direction (Z direction) from the upper surface of the vertical heat dissipation block 232a. The horizontal heat dissipation block 232b may have a grid shape to increase a thermal contact area with the number of elements. For example, the vertical heat dissipation block 232a and the horizontal heat dissipation block 232b 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 upper surface of the vertical heat dissipation block 232 of the heat dissipation plate 232 , and the heat dissipation plate 232 is disposed within the first protection tube 222a by the first connector pin 235 . It may be electrically connected to the first power cable 223a. For example, the heat dissipation plate 232 may include a metal material such as aluminum or copper.

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 support 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.

8 to 10 , at least one heat transfer element plate 240 may be inserted into the slot 234 of the heat dissipation plate 232 . For example, two heat transfer element plates 240 are respectively inserted into the slots 234 of the heat dissipation plate 232 , and one heat transfer element plate 240 has three heat transfer elements 246 disposed therein. can However, it will be understood that the number of the heating element plates and 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 so 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 opposite to the first surface exposed by the insulating plate 244 , that is, the heating surface is The inner surface of the slot 234 may be in face contact.

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 extends over the electrode part 242 , and the electrode part 242 is connected to the second power cable 223b in the second protection tube 222b by the second connector pin 243 . may be electrically connected. 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 barium titanate-based (BaTiO ₃ ) semiconductor, and use 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 to 6 degrees. The thickness of the heating element plate 240 may gradually decrease as it goes down.

As shown in FIG. 11 , the 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.

12, the vertical heat dissipation block 232a of the heat dissipation plate 232 has a plate shape extending in the vertical direction (Z direction), and a molding member 233 sealing the vertical heat dissipation block 232a. First and second insertion holes 236a and 236b into which lower ends of the first and second protection tubes 222a and 222b are inserted may be formed at the upper portion. The lower ends of the first and second protection tubes 222a and 222b are to be airtightly coupled to the first and second insertion holes 236a and 236b of the molding member 233 with the O-ring 237 interposed therebetween. can The first and second connector pins 235 and 243 are exposed in the first and second insertion holes 236a and 236b of the molding member 233 , and the exposed connector pins 235 and 243 include first and the first and second power cables 223a and 223b in the second protection tubes 222a and 222b.

The horizontal heat dissipation block 232b of the heat dissipation plate 232 has a plate shape extending in first and second horizontal directions (X, Y directions) orthogonal to the vertical direction (Z direction), and the horizontal heat dissipation block 232b The upper surface of the molding member 233 sealing the urea water supply tube (224a) and the lower end of the urea water recovery tube (224b) and the sensor device 250 can be supported, respectively.

13, in exemplary embodiments, the urea water sender 200 may further include a filter unit 260 for filtering the number of urea to be supplied through the urea water supply tube 224a. have. The filter unit 260 may be fixedly installed on the heating support unit 230 . The filter unit 260 may be fixed on the upper surface of the molding member 233 sealing the horizontal heat dissipation block 232b. The filter unit 260 may include a rectangular parallelepiped filter structure 262 and a plurality of support pillars 264 supporting the filter structure in the filter structure 262 .

The lower end of the urea water supply tube 224a is inserted and fixed into the filter structure 262 , and the lower end of the inner urea water supply pipe 225a may be located inside the filter structure 262 . Therefore, the inner urea water supply pipe (225a) can be supplied by sucking the filtered urea water through the filter structure (262).

In exemplary embodiments, the sensor device 250 may be fixedly installed on the heating support 230 . The sensor device 250 may be fixed on the upper surface of the molding member 233 sealing the horizontal heat dissipation block 232b. Cables for power supply and signal transmission to the sensor device 250 may be disposed inside the third protective tube 226 . The third protective tube 226 may extend downward from the sender mounting unit 210 and be connected to the sensor device 250 mounted on the heating support unit 230 . The cables may include a power cable and a CAN communication cable. The cables may be connected to the connector 216 for power supply and signal transmission of the sender mounting unit 210 .

14 , 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 the water surface of the urea water as the state values.

The sensor device 250 may include a sensor housing 252 that is arranged 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 . The concentration value of the urea water inside the sensor housing 252 may be calculated by measuring the reflected return times. By using the reciprocating time and reciprocating distance of the ultrasonic wave, the speed of the ultrasonic wave can be calculated, and the concentration value of the urea water can be calculated through a table for the speed for each concentration of the urea water. Noise can be removed by using two reflectors.

An opening 253 is formed in the upper portion of the sensor housing 252 , and the second sensor unit 254b measures the return time of ultrasonic waves vertically scanned from the oscillation unit reflected from the surface of the urea water through the opening 253 . Thus, it is possible to calculate the level of sleep of urea water.

Alternatively, the sensor device may include a concentration sensor and a level sensor separated from each other. The concentration sensor may be an ultrasonic type concentration sensor. The level sensor may be a level sensor using a float or an ultrasonic type level sensor.

In exemplary embodiments, the urea number sender 200 may include a shock-absorbing damper 270 installed on the lower surface of the heating support 230 . For example, the shock absorbing damper 270 may include a rubber adsorption block fixed to the lower surface of the heating support 230 . The shock absorption damper 270 may be adsorbed and supported on the bottom surface of the urea water tank 100 to support the heating support 230 on the bottom surface of the urea water tank 100 .

As described above, the urea water sender 200 is installed to be immersed in the urea water of the urea water tank 100 by at least one supporting member 222a, 222b extending downward from the sender mounting part 210, and PTC. It may include a heating support unit 230 including a heating unit in which the elements 246 are installed and a molding member 233 sealing the heating unit from the number of elements. The heating unit may include at least one heating element plate 240 on which the PTC elements 246 are seated, and a heat dissipation plate 232 on which the heating element plate 240 is inserted. The heat dissipation plate 232 has a slot 234 into which the heat transfer element plate 240 is inserted, and one surface of the slot 234 may be in surface contact with the heat generating surface of the PTC element 246 .

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 a 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 poor contact.

Furthermore, the urea water supply tube 224a is an inner urea water supply pipe 225a for sucking and supplying urea water in the urea water tank 100, and a heating wire extending in a coil shape along the circumference of the inner urea water supply pipe 225a ( 225b), and an outer protective tube 225c for insulating and sealing the inner urea water supply pipe 225a and the heating wire 225b from the outside. Accordingly, the heating wire 225b may prevent the freezing of the urea water of the urea water in the inner urea water supply pipe 225a and thaw the frozen urea water.

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 214a: connector for supplying urea water
214b: urea water recovery connector
216: for connectors for power supply and signal transmission
218: air vent tube 222a: first protective tube
222b: second protective tube 223a: first power cable
223b: second power cable 224a: urea water supply tube
224b: urea water recovery tube 225a: inner urea water supply pipe
225b: heating wire 225c: outer protection tube
226: third protective tube 230: heating support
232: heat dissipation plate 232a: vertical heat dissipation block
232b: horizontal heat dissipation block 233: molding member
234: slot 235: first connector pin
240: heating element plate 242: electrode part
243: second connector pin 244: insulating plate
246: electrothermal element 250: sensor device
252: sensor housing 253: opening
254a: first sensor unit 254b: second sensor unit
255: inclined plate 256: reflector
260: filter unit 262: filter structure
264: support column 270: shock absorption damper

Claims (20)

a sender mounting unit mounted in a mounting hole formed in the upper wall of the urea water tank and having a connector for supplying urea water and a connector for recovering urea water;
A heating unit installed to be immersed in the urea water of the urea water tank by at least one supporting member extending downward from the sender mounting unit, a heating unit in which heat transfer elements generated by power are installed, and the heating unit are sealed from the urea water a heating support comprising a molding member;
a urea water supply tube and a urea water recovery tube respectively connected to the connector for supplying urea and the connector for recovering urea water, extending downward from the sender mounting part, and having lower ends disposed in the heating support part; and
It is installed in the heating support, the heat transfer type urea number sender including a sensor device for measuring the state value of the urea water. The sender of claim 1, wherein the heat transfer elements include Positive Temperature Coefficient (PTC) elements. According to claim 1, wherein the heating unit
at least one heating element plate to which external power is applied and including 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; and
and a heat dissipation plate having a slot into which the heat transfer element plate is inserted and in surface contact with the heat transfer elements inserted into the slot. [4] The sender of claim 3, wherein the heat dissipation plate includes a vertical heat dissipation block having the slot and extending in a vertical direction and a horizontal heat dissipation block extending in a horizontal direction from the vertical heat dissipation block. [4] The sender of claim 3, wherein the distance between the 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 an angle between the outer surface of the insulating plate and the outer surface of the electrode part is within a range of 2 to 6 degrees. According to claim 1, wherein the sensor device is an electrothermal urea water sensor for measuring the concentration of the urea water and the level of the water surface of the urea water. According to claim 1, wherein the support member includes first and second protection tubes extending downwardly from the sender mounting portion to be respectively coupled to the heating support portion, and the first and second protection tubes inside the first and second protection tubes An electrothermal urea number sender in which the second power cables are respectively disposed. According to claim 1, wherein the urea water supply tube is
an inner urea water supply pipe for sucking and supplying urea water in the urea water tank;
a heating wire extending in a coil shape along the circumference of the inner urea water supply pipe; and
Heat transfer type urea water sender including an outer protective tube for insulating and sealing the inner urea water supply pipe and the heating wire from the outside. The method of claim 1,
The heat transfer type urea water sender further comprising a filter part fixedly installed on the heating support part and fastened to the lower end of the urea water supply tube to filter the number of urea to be supplied through the urea water supply tube. 11. The method of claim 10, wherein the filter unit heat transfer-type element number sender comprising a rectangular parallelepiped filter structure fixed on the heating support and a plurality of support pillars for supporting the filter structure inside the filter structure. Tank body having a mounting hole formed through the upper wall; and
and a urea number sender that is detachably mounted in the mounting hole,
The number of urea senders,
a sender mounting unit detachably mounted to the mounting hole;
At least one heating element plate installed so as to be immersed in the urea water of the urea water tank by at least one supporting member extending downward from the sender mounting part, and having heat transfer elements that are heated by a power source, the heat transfer element plate is inserted A heating support comprising a heat dissipation plate having a slot to be, and a molding member for sealing the heat dissipation plate from the number of elements;
a urea water supply tube and a urea water recovery tube extending downward from the sender mounting part and having lower ends disposed in the heating support part; and
A urea water tank installed on the heating support and including a sensor device for measuring the state value of the urea water. 12. The method of claim 11, wherein the heating element plate comprises an electrode portion on which the heating 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 slit of the heat dissipation plate. The urea water tank according to claim 13, wherein the heat dissipation plate includes a first heat dissipation block having the slit and a second heat dissipation block extending from the first heat dissipation block in a horizontal direction. The urea water tank according to claim 14, wherein a first connector pin is provided on an upper surface of the second heat dissipation block, and a second connector pin is provided on an upper surface of the electrode part. 16. The method of claim 15, wherein the support member includes first and second protection tubes extending downward from the sender mounting unit and respectively coupled to the first heat dissipation block,
First and second power cables are respectively disposed inside the first and second protection tubes, and the first and second power cables are electrically connected to the first and second connector pins. The urea water tank according to claim 13, wherein the distance between the 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 method of claim 11, wherein the urea water supply tube is
an inner urea water supply pipe for sucking and supplying urea water in the urea water tank;
a heating wire extending in a coil shape along the circumference of the inner urea water supply pipe; and
A urea water tank comprising an outer protective tube for insulating and sealing the inner urea water supply pipe and the heating wire from the outside. The urea water tank according to claim 11, wherein the sensor device measures the concentration of the urea water and the level of the water surface of the urea water. The method of claim 11, wherein the urea water sender is fixed on the heating support and the lower end of the urea water supply tube is fastened to further include a filter for filtering the number of urea to be supplied through the urea water supply tube urea tank.

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