KR101389964B1 - Temperature measurement module and apparatus for measuring injection uniformity having the same - Google Patents

Abstract

A reducing agent uniformity measuring apparatus according to the present invention is an apparatus for measuring the uniformity of a reducing agent in an exhaust gas purifying system including a catalytic converter and a reducing agent injector, A temperature measurement module; And a controller for receiving the temperature data for each region of the cross section of the exhaust gas channel and calculating the uniformity of the reducing agent. By using the apparatus for measuring the uniformity of the reducing agent according to the present invention, it is possible to estimate the performance of the catalytic converter and optimize the exhaust gas purification system by checking how much the reducing agent injected from the exhaust gas reducing apparatus is distributed and the reaction rate of the reducing agent in real time. The advantage is that the cost can be reduced.

Description

TECHNICAL FIELD [0001] The present invention relates to a temperature measurement module and a reducing agent uniformity measuring apparatus having the same.

The present invention relates to a temperature measuring module capable of more accurately measuring the temperature of each zone of a setting region and a reducing agent uniformity measuring device configured to determine the uniformity of the reducing agent including the temperature measuring module.

Recently, research and development aimed at reducing nitrogen oxides in exhaust gas due to environmental pollution have been actively carried out. There are two types of post-treatment technologies for such NOx reduction (De-NOx).

The first is a nitrogen oxide storage catalyst (Lean NOx Trap: LNT) applying nitrogen oxide storage material. However, in order to use LNT catalysts storing nitrogen oxides, the diesel engine must be able to operate at a stoichiometric air-fuel ratio (14.7) or less. In addition, in order to create a rich spike below the stoichiometric air-fuel ratio, it is necessary not only to use the engine post-injection technology but also to inject the fuel into the exhaust pipe secondarily.

A second method for reducing nitrogen oxides is UREA-Selective Catalyst Reduction (hereinafter referred to as UREA-SCR) in which an aqueous solution of UREA is injected into an exhaust pipe to reduce nitrogen oxides in the exhaust gas. System. The urea solution injected into the exhaust pipe is pyrolyzed (decomposition temperature: 156 ° C.) by the heat in the exhaust pipe or is contact-decomposed by contacting with the catalyst, so that one element is converted into two molecules of ammonia. The converted ammonia reacts with nitrogen oxides in the exhaust gas in response to SCR (Selective Catalyst Reduction), and nitrogen and water are discharged to the outside of the vehicle.

As a method for purifying nitrogen oxides in the exhaust gas, it has become common to use a catalytic converter for injecting a reducing agent such as urea or hydrocarbon into the exhaust gas as described above. Since the nitrogen oxide purification efficiency of the catalytic converter is highly dependent on the optimum supply method of the reducing agent, the method of mounting the injector on the exhaust pipe at the front end of the catalytic converter is the most suitable for accurately controlling the supply of the reducing agent. Since the uniform distribution of the reducing agent injected from the injector directly on the catalyst efficiency is very large in the catalytic converter system, the uniformity of the reducing agent is used as a reference for optimizing the system. Since the uniformity of the high reducing agent can reduce the capacity of the catalyst, it is possible to save the budget in terms of the purchase cost of the catalytic converter using expensive precious metal as the main component.

Methods for measuring the uniformity of the reducing agent include a method of measuring exhaust gas at each measurement point on the front and rear sides of the catalytic converter and a method of acquiring and measuring an image of the cross sectional distribution of the reducing agent on the upstream side of the catalytic converter.

  Among the methods of measuring the uniformity of the reducing agent, a method of measuring the exhaust gas at each measuring point on the front and rear sides of the catalytic converter is the most reliable method. However, a constant measuring point of the exhaust pipe section is set, And it is time-consuming and costly to obtain the results for one experimental condition by plotting each measurement point on the graph.

 The method of acquiring and measuring the image of the cross-sectional distribution of the reducing agent on the upstream side of the catalytic converter is a method of visualizing the reducing agent distribution on the upstream side of the catalytic converter with a high-speed camera. It is not possible to measure the exact distribution.

SUMMARY OF THE INVENTION The present invention has been made in order to solve the above problems, and it is an object of the present invention to provide a temperature measuring module capable of measuring temperature of each part in a setting area more easily and accurately, Thereby reducing the time and cost of predicting the performance of the catalytic converter and optimizing the system.

According to another aspect of the present invention, there is provided an apparatus for measuring the uniformity of a reducing agent in an exhaust gas purifying system including a catalytic converter and a reducing agent injector, A temperature measurement module for measuring the temperature of each section of the cross section; And a controller for receiving the temperature data for each region of the cross section of the exhaust gas channel and calculating the uniformity of the reducing agent.

The control unit receives the exhaust gas temperature data before the reducing agent injection and the exhaust gas temperature data after the reducing agent injection from the temperature measurement module to calculate the uniformity of the reducing agent.

The control unit calculates the exhaust gas temperature difference (hereinafter abbreviated as "exhaust gas temperature variation amount") before the reducing agent injection and after the reducing agent injection for each region of the exhaust gas passage cross section, The deviation is compared to calculate the uniformity of the reducing agent.

The control unit determines that the uniformity of the reducing agent is lower as the temperature variation amount deviation per region of the exhaust gas flow path is larger and the variation in temperature variation amount for each region of the exhaust gas flow path is smaller.

The temperature measurement module is mounted on a front end of the catalytic converter, and the control unit calculates an exhaust gas temperature change amount generated by the vaporization of the reducing agent.

The temperature measurement module is mounted at a rear end of the catalytic converter, and the control unit calculates an exhaust gas temperature change amount generated by an exothermic reaction while the reducing agent passes through the catalytic converter.

The temperature measurement module includes an outer frame surrounding the exhaust gas flow path section, an inner frame dividing the exhaust gas flow path section into a plurality of unit areas, and a plurality of temperature sensors for measuring the temperature of each unit area .

The inner frame has a hexagonal lattice structure, and the unit area is formed into a hexagonal shape.

The temperature sensor is disposed on a side where the fluid flows on the basis of the inner frame.

The temperature sensing sensor has a structure in which one side of the temperature sensing sensor is inserted into the inner region of the outer frame through the outer frame and the insertion length of the temperature sensing sensor is adjustable, .

A temperature measurement module according to the present invention includes: an outer frame surrounding a certain region; An inner frame dividing an inner region of the outer frame into a plurality of unit regions; And a plurality of temperature sensors for measuring the temperature of each unit area.

The temperature sensor is mounted such that a temperature sensing part is positioned at the center of the unit area.

The inner frame has a hexagonal lattice structure, and the unit area is formed into a hexagonal shape.

The temperature sensor is disposed on a side where the fluid flows on the basis of the inner frame.

The temperature sensor is inserted into the inner region of the outer frame through one side of the outer frame.

And coupling means for coupling the temperature sensor to the outer frame in a structure capable of adjusting the insertion length of the temperature sensor.

The use of the temperature measurement module according to the present invention has the advantage that the temperature of each part in the setting area can be measured more simply and accurately and the temperature of various patterns can be measured while changing the measurement area. Further, by using the apparatus for measuring the uniformity of the reducing agent according to the present invention, it is possible to predict the performance of the catalytic converter and optimize the exhaust gas purification system by checking how the reducing agent injected from the exhaust gas reducing apparatus is distributed evenly and the reaction rate of the reducing agent in real- It has the advantage of saving time and money.

1 is a schematic view of an exhaust gas purifying system to which a reducing agent uniformity measuring apparatus according to the present invention is applied.
2 and 3 are sectional views of a catalytic converter showing a mounting position of a temperature measurement module according to the present invention.
4 and 5 are a front view and a sectional view of the temperature measurement module according to the present invention.
6 is a front view showing a lattice structure of an inner frame included in the temperature measurement module according to the present invention.

Hereinafter, embodiments of a reducing agent uniformity measuring apparatus and a temperature measuring module according to the present invention will be described in detail with reference to the accompanying drawings.

1 is a schematic view of an exhaust gas purifying system to which a reducing agent uniformity measuring apparatus according to the present invention is applied.

In general, the internal combustion engine includes an intake tube 4 to which a mixer is supplied, a combustion chamber 1 in which a mixture is combusted to generate power, and an exhaust pipe 2 for exhausting exhaust gas generated by the mixture combustion . In this case, the exhaust gas purifying system is for reducing the harmful components contained in the exhaust gas of the internal combustion engine. The exhaust gas purifying system includes a catalytic converter (not shown) for receiving the exhaust gas from the exhaust pipe 2 and purifying the harmful components contained in the exhaust gas A reducing agent injector 6 for injecting a reducing agent into the exhaust gas supplied to the catalytic converter 10, a pump module 7 for supplying a reducing agent to the reducing agent injector 6, and a reducing agent injector 6 And an injector drive driver 8 for driving the injector. The catalytic converter 10 is mounted at a position past the turbocharger 5 when the supercharger 5 for improving the output of the engine is additionally provided by increasing the intake air amount by using the exhaust gas discharge pressure, 6 are mounted between the supercharger 5 and the catalytic converter 10. [ At this time, the exhaust gas purifying efficiency has a proportional relationship with the reducing agent reducing reaction efficiency. In designing the exhaust gas purifying system, the reducing agent injecting time, the exhaust gas pressure, the kind of the reducing agent injector 6, , The kind of the catalyst, and the like are appropriately adjusted so as to calculate how uniformly the reducing agent is distributed, that is, the uniformity of the reducing agent.

An apparatus for measuring a reducing agent uniformity according to the present invention is an apparatus for calculating a reducing agent uniformity when a reducing agent is injected into an exhaust gas supplied to a catalytic converter 10 in an exhaust gas purifying system, The temperature of the exhaust gas of the reducing agent is measured to calculate the reducing agent uniformity. At this time, the reducing agent uniformity measuring apparatus according to the present invention does not measure only the temperature at any one of the one end face (hereinafter referred to as the "end face of the exhaust gas flow passage") of the flow passage through which the exhaust gas flows, Is divided into a plurality of zones, and temperatures of the zones are individually measured to determine how much exhaust gas is distributed in each zone, and the uniformity of the reducing agent can be calculated through the determination.

That is, the apparatus for measuring the uniformity of the reducing agent according to the present invention comprises a temperature measurement module 100 (100) mounted on the catalytic converter 10 for measuring the temperature of each section of the exhaust gas flow passage, so as to measure the uniformity of the reducing agent, And a controller 300 for receiving the temperature data for each region of the exhaust gas flow path section collected by the data collecting apparatus 200 and calculating the uniformity of the reducing agent. The temperature of the exhaust gas injected with the reducing agent is increased or decreased by the distribution of the reducing agent such as the temperature is lowered due to the latent heat of evaporation of the reducing agent or the temperature is raised by the exothermic reaction of the reducing agent. It is possible to calculate the uniformity of the reducing agent very easily by comparing the temperatures of the respective regions when the temperature of each region on the exhaust gas channel cross section can be measured at one time.

On the other hand, due to various causes such as a phenomenon that heat of the exhaust gas is discharged to the outside through the wall surface of the exhaust pipe 2, a phenomenon that the exhaust gas does not flow in a steady state and flows along irregular flow lines, The initial temperature may be different for each region on the cross section. Even if the exhaust gas temperatures of the respective regions are lowered by the same width due to the reducing agent injection, the final temperatures of the respective regions still remain different when the initial temperature is different for each region on the cross section of the gas channel, It is impossible to accurately measure the uniformity of the reducing agent by measuring only the final temperature of each section of the gas flow passage.

Therefore, the controller 300 receives the exhaust gas temperature data before the reducing agent injection and the exhaust gas temperature data after the reducing agent injection from the temperature measurement module 100, respectively, and calculates the uniformity of the reducing agent before the calculation of the reducing agent, And then the temperature data is received from the temperature measurement module 100, and the uniformity of the reducing agent is calculated through the temperature variation amount of each region. That is, the temperature change of each region is due to the distribution of the reducing agent, and when the uniformity of the reducing agent is calculated by the temperature change amount of each region by receiving the temperature data before the reducing agent injection and after the reducing agent injection, .

At this time, the temperature change amount may be compared for each region, and the reducing agent uniformity may be calculated based on the temperature variation amount deviation for each region. That is, the control unit 300 calculates exhaust gas temperature difference (hereinafter, referred to as "exhaust gas temperature variation amount") before and after the reducing agent injection for each region of the exhaust gas flow passage, To calculate the uniformity of the reducing agent. For example, when the initial temperatures of three different regions on one exhaust gas flow path section are t ₁ , t ₂ , and t ₃ , and the three region temperatures after the reducing agent is injected are t ₁ ', t ₂ ', t ₃ ', the temperature change amounts of the three regions are defined as follows.

? T ₁ (first region temperature change amount) = t ₁ - t ₁ '

T ₂ (second region temperature change amount) = t ₂ - t ₂ '

Δt ₃ (third region temperature change amount) = t ₃ - t ₃ '

The temperature change of three different areas that is, it is possible to calculate the reducing agent uniformity by calculating the standard deviation of the △ t ₁ and t ₂ and △ △ t _3. In this case, the large deviation of the temperature variation amount in the cross-sectional area of the exhaust gas flow channel means that the reducing agent is not uniformly distributed, and the small variation in the temperature variation amount in the cross-sectional area of the exhaust gas flow channel means that the reducing agent is evenly distributed. The control unit 300 determines that the uniformity of the reducing agent is higher as the temperature variation amount deviation of the exhaust gas flow path cross section is larger and the variation amount of the temperature variation amount of each section of the exhaust gas flow path is smaller. Further, since the standard deviation between? T ₁ and? T ₂ and? T ₃ is represented by one numerical value, it is advantageous that the uniformity of the reducing agent of various embodiments in which the conditions related to the reducing agent uniformity are adjusted can be compared at a glance .

On the other hand, if the end face of the exhaust gas flow passage is finely divided to greatly increase the number of the unit areas 130, it may be considered that the uniformity of the reducing agent can be calculated more accurately. However, in this case, The number of the sensors 140 is excessively increased to prevent the exhaust gas from flowing normally, which may result in lowering the accuracy of the uniformity of the reducing agent. Therefore, the apparatus for measuring the uniformity of the reducing agent according to the present invention can obtain the temperature data of each unit area 130 and further obtain the temperature data by a very small area (for example, at intervals of 1 mm) by using the interpolation method, Can be configured to calculate more accurately.

Generally, linear interpolation method, Newton polynomial interpolation method, spline interpolation method and the like are used. Since linear interpolation is merely a linear connection of data, accuracy is poor. Newton polynomial interpolation method is a phenomenon in which a graph is strongly oscillated at an inflection point, that is, There is a disadvantage that a runge phenomenon occurs and there is a difference from the actual measured value. In contrast, the spline interpolation method uses a low-degree polynomial for each section by dividing the intervals between data, unlike the polynomial interpolation which expresses the entire section as one polynomial, The control unit 300 may be configured to additionally obtain temperature data for each very small area by calculating the temperature data of each unit area 130 by the spline interpolation method. Since the spline interpolation method is widely used in the field of numerical analysis, a detailed description thereof will be omitted.

2 and 3 are sectional views of the catalytic converter 10 showing the mounting position of the temperature measurement module 100 according to the present invention.

The reducing agent injected into the exhaust gas flowing into the catalytic converter 10 is evaporated by the heat of the exhaust gas and absorbs the latent heat of evaporation. The temperature of the exhaust gas is reduced as the reducing agent is evaporated, Lt; / RTI > In the case where the exhaust gas is configured to calculate the reducing agent uniformity by measuring the degree of decrease in temperature due to the latent heat of evaporation of the reducing agent, the temperature measuring module 100 may be configured such that the front end Respectively.

When the reducing agent introduced into the catalytic converter 10 is urea (element), the reducing agent generates heat during the passage through the catalytic converter 10, so that the temperature of the exhaust gas rises. At this time, the large amount of heat means that the distribution of the reducing agent is high. Therefore, the method of measuring the exhaust gas temperature rise amount can also calculate the reducing agent uniformity. When the reducing agent uniformity is to be calculated by the exhaust gas temperature increase amount due to the exothermic reaction of the reducing agent, the temperature measuring module 100 is preferably mounted at the rear end of the catalytic converter 10 as shown in FIG.

Of course, when it is desired to calculate the uniformity of the reducing agent considering both the exhaust gas temperature is lowered due to the latent heat of vaporization of the reducing agent and the exhaust gas is raised due to the exothermic reaction of the reducing agent, 10, respectively.

4 and 5 are a front view and a sectional view of a temperature measurement module 100 according to the present invention and FIG. 6 shows a lattice structure of an inner frame 120 included in the temperature measurement module 100 according to the present invention Front view.

The temperature measurement module 100 for measuring the temperature of the end face of each exhaust gas flow channel in each region includes an outer frame 110 surrounding a certain region (an end face of the exhaust gas flow path in this embodiment) An inner frame 120 for dividing the inner region of the unit area 130 into a plurality of unit areas 130 and a plurality of temperature sensors 140 for measuring the temperature of the unit area 130, respectively.

The outer frame 110 may be formed in a closed curve or a closed polygonal shape so as to completely enclose the end surface of the exhaust gas flow channel, or may be formed so as to surround only a part of a region where temperature is to be measured have. The outer frame 110 serves as a base frame for fixing the positions of the inner frame 120 and the temperature sensing sensor 140. The inner frame 120 and the temperature sensing sensor 140 are stably fixed Any shape can be substituted as long as it can be done. However, since the temperature sensor 140 is mounted on the outer frame 110 in all directions, it is preferable that the temperature sensor 140 is formed to surround the entire area for measuring the temperature, as shown in this embodiment.

The inner frame 120 is a component for uniformly dividing the temperature measurement area, that is, the end face of the exhaust gas flow channel, into uniform unit areas 130 having the same size so that the temperature measurement points are spaced apart at regular intervals. The number of unit areas 130 may be set differently depending on the type of the catalytic converter 10, the kind of reducing agent, the injection amount, and the like. The temperature sensor 140 is provided with a plurality of (at least as many as the number of the unit areas 130) for measuring the temperatures of the plurality of unit areas 130 divided by the inner frame 120, So as not to disturb the flow of the fluid. Although the temperature sensing part of the temperature sensing sensor 140 is located at one end in the longitudinal direction and one longitudinal end of each temperature sensing sensor 140 is located in the different unit area 130, The temperature sensing part of the temperature sensing sensor 140 may be variously changed.

Using the temperature measurement module 100 including the outer frame 110, the inner frame 120, and the temperature sensor 140, the end face of the exhaust gas flow path is equally divided into a plurality of unit areas 130, Since the temperature of the unit area 130 can be measured independently, it is possible to more accurately calculate the uniformity of the reducing agent distributed on the end face of the exhaust gas passage.

At this time, the exhaust gas passing through the center region of the unit region 130 is spaced far away from the inner frame, so that the influence of the inner frame is relatively less, so that a flow similar to the case without the inner frame can be seen. However, since the exhaust gas passing through the region adjacent to the inner frame, that is, the most geographical region of the unit region 130, is changed by the friction with the inner frame and the heat is absorbed by the inner frame, Lt; / RTI > Therefore, in order to obtain a measurement value similar to that for measuring the temperature of each section of the cross section of the exhaust gas channel in the actual exhaust gas purification system in which the inner frame is not mounted, It is preferable that the unit area 130 is mounted so as to be positioned at the center of the unit area 130.

In this case, the inner frame 120 may be configured to have a rectangular shape or a triangular shape. However, in this case, the inner frame 120 may have a center distance to the neighboring unit areas 130 in the vertical and horizontal directions, The temperature sensors 140 for measuring the temperature of each unit area 130 are not equally spaced in each direction because the center distance between the unit area 130 and the unit area 130 is different. In addition, when the unit area 130 is formed in a circular shape, the temperature sensors 140 may be spaced at equal intervals in each direction. However, it is difficult to manufacture the inner frame 120. Therefore, the inner frame 120 is formed in a hexagonal shape so that the center distance between adjacent unit areas 130 can be set to be the same in each direction and the inner frame 120 can be easily manufactured Structure, that is, a hexagonal lattice structure. When the inner frame 120 is formed in a hexagonal lattice structure as described above, the inner space of the outer frame 110 can be most efficiently partitioned, and since the inner frame 120 has strong structural strength against an external force perpendicular to the exhaust gas flow direction, Can be obtained.

5, it is preferable that the temperature sensor 140 is disposed on the side (the left side in FIG. 5) on which the fluid flows from the inner frame 120 as shown in FIG. Generally, since the exhaust gas is discharged with a considerably large pressure, when the temperature sensor 140 is mounted so as to be supported only on the outer frame 110, there is a fear that the temperature sensor 140 is bent or broken by the pressure of the exhaust gas have. However, when the temperature sensing sensor 140 is disposed on the inflow side of the inner frame 120 with respect to the inner frame 120, the inner frame 120 serves to support the temperature sensing sensor 140, ) Is significantly reduced.

Meanwhile, the temperature sensor 140 is formed in a bar shape having a length on one side so as to minimize a portion located on the exhaust gas cross-sectional flow path so as not to hinder the flow of the exhaust gas, And is disposed in the inner region of the outer frame 110 through the frame 110. In this case, the temperature measurement module 100 can adjust the insertion length of the temperature sensing sensor 140 so that the position of the temperature sensing sensor 140 (in the present embodiment, one end in the longitudinal direction) And a fastening means 150 for fastening the fastening means 150 to the outer frame 110. The fastening means 150 has a structure in which one end of the temperature sensing sensor 140 is penetrated and the one end penetration distance of the temperature sensing sensor 140 is adjustable and fixed to the outer frame 110 . Accordingly, the user inserts the temperature sensing sensor 140 into the fastening means 150 fixed to the outer frame 110 and then adjusts the insertion distance. When the insertion distance adjustment of the temperature sensing sensor 140 is completed, 140 are fastened to the fastening means 150 so that the end of the temperature sensor 140 can be precisely positioned in the center of the unit area 130.

Although the temperature measuring module 100 is applied to a reducing agent uniformity measuring apparatus in the present embodiment, the temperature measuring module 100 may divide one temperature measuring region into a plurality of small regions It can be applied to any field where work is required. That is, the temperature measurement module 100 is not limited to the use for measuring exhaust gas temperature, and can be used for various purposes.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is to be understood that the scope of the present invention is not limited to the disclosed exemplary embodiments. It will also be appreciated that many modifications and variations will be apparent to those skilled in the art without departing from the scope of the present invention.

1: Combustion chamber 2: Exhaust pipe
4: intake tube 5: supercharger
6: Reducing agent injector 7: Pump module
8: injector drive driver 10: catalytic converter
100: temperature measurement module 110: outer frame
120: inner frame 130: unit area
140: temperature sensor 150: fastening means
200: data collecting apparatus 300:

Claims (16)

An apparatus for measuring the uniformity of a reducing agent in an exhaust gas purifying system including a catalytic converter and a reducing agent injector,
A temperature measurement module mounted on the catalytic converter and measuring a temperature of each cross-sectional area of an exhaust gas flow passage;
A control unit for receiving the exhaust gas temperature data before the reducing agent injection and the exhaust gas temperature data after the reducing agent injection from the temperature measurement module for each region of the exhaust gas flow passage section to calculate the uniformity of the reducing agent;
/ RTI >
The control unit calculates exhaust gas temperature differences (hereinafter, referred to as "exhaust gas temperature variation amounts") before and after the reducing agent injection for each region of the exhaust gas flow passage, and compares the deviation of the exhaust gas temperature variation amounts And the reducing agent uniformity is determined to be higher as the exhaust gas temperature variation amount deviation is larger, the reducing agent uniformity is lower, and the exhaust gas temperature variation amount deviation is smaller, so that the reducing agent uniformity is higher.
delete delete delete The method according to claim 1,
Wherein the temperature measurement module is mounted on a front end of the catalytic converter,
Wherein the control unit calculates the reducing agent uniformity by the exhaust gas temperature change amount generated by the vaporization of the reducing agent.
The method according to claim 1,
Wherein the temperature measurement module is mounted at a rear end of the catalytic converter,
Wherein the control unit calculates the reducing agent uniformity by an exhaust gas temperature change amount generated by an exothermic reaction while the reducing agent passes through the catalytic converter.
The method according to claim 1,
The temperature measurement module includes:
An outer frame surrounding the end face of the exhaust gas flow passage, an inner frame dividing the end face of the exhaust gas flow passage into a plurality of unit areas, and a plurality of temperature sensors for measuring the temperature of each unit area. An apparatus for measuring the uniformity of reducing agent in a purification system.
8. The method of claim 7,
Wherein the inner frame has a hexagonal lattice structure, and the unit area is formed in a hexagonal shape.
8. The method of claim 7,
Wherein the temperature sensor is disposed on a side to which the exhaust gas flows on the basis of the inner frame.
10. The method of claim 9,
Wherein the temperature sensor has one side inserted into the inner region of the outer frame through the outer frame,
Further comprising fastening means for coupling the temperature sensing sensor to the outer frame with a structure capable of adjusting an insertion length of the temperature sensing sensor.
delete delete delete delete delete delete

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