JP5914297B2 - Fluid heating device and catalyst evaluation test device - Google Patents

Description

  The present invention relates to a fluid heating apparatus and a catalyst evaluation test apparatus for evaluating a catalyst by reacting a simulated exhaust gas heated using the fluid heating apparatus with a catalyst provided in an exhaust pipe of an automobile.

When evaluating a catalyst provided in an engine exhaust pipe or the like, a simulated exhaust gas having the same components as the actual exhaust gas is generated, and the simulated exhaust gas is introduced into a heating furnace to have a predetermined value similar to the actual exhaust pipe passing temperature. The temperature is raised to a temperature and sprayed to the catalyst provided on the outlet side of the heating furnace.
Therefore, conventionally, the temperature of the simulated exhaust gas in the vicinity of the catalyst is measured, and the heat generation amount of the heating furnace is controlled so that the measured temperature becomes the predetermined temperature.

  Recently, there has been a demand for evaluation of a catalyst at the time of engine start-up, high load, etc. For this purpose, it is necessary to accurately raise the temperature of the simulated exhaust gas to a predetermined temperature in a very short time.

  However, in the method described above, the temperature is raised while feedback-controlling the amount of heat generated in the heating furnace, so the rate of temperature rise is extremely slow (for example, about 1 ° C./sec), and the above requirement cannot be met at all.

Therefore, as shown in Patent Document 1, the output of the heating furnace is set to a maximum value, for example, to generate a simulated exhaust gas that is overheated, and the mixing ratio between the overheated simulated exhaust gas and the cooling simulated exhaust gas is controlled to obtain a desired temperature. An apparatus for obtaining simulated exhaust gas is also considered. However, even with such a configuration, the rate of temperature increase can only be improved to several times that of the above method.
Such a problem is common in heating not only simulated exhaust gas but also fluids.

JP 2003-126658 A

  The present invention has been made in view of the above problems, and provides a fluid heating apparatus and the like that can raise the temperature of a fluid such as simulated exhaust gas to a predetermined temperature with high accuracy and in an extremely short time. Is the intended task.

That is, the fluid heating apparatus according to the present invention has the following constituent features.
(1) A heating flow path for heating a fluid.
(2) A switching mechanism that switches and reverses the direction of the fluid flowing through the heating flow path between a forward direction and a reverse direction.
(3) A temperature rising region in which the fluid flowing in the forward direction passes through the heating channel and a paired region in which the fluid flowing in the reverse direction passes through the heating channel.
(4) A temperature control mechanism that adjusts the temperature of the fluid flowing through the temperature rising region and the paired region.
(5) The temperature control is performed so that the switching mechanism is controlled to bring the heating flow path into a reverse flow state in which the fluid flows in the reverse direction, and the temperature of the fluid flowing in the counter area in the reverse flow state becomes a preset target temperature. A control mechanism that controls the switching mechanism to control the switching mechanism so that the fluid flows in the positive direction.

  An embodiment in which the effect of the present invention is particularly remarkable is a catalyst evaluation test apparatus using the fluid heating apparatus, wherein the fluid is simulated exhaust gas, and the exhaust gas catalyst can be installed in the temperature rising region. Can be mentioned.

As a specific embodiment for realizing the present invention with a simple configuration,
The heating channel and a pair of adjacent channels extended from one end and the other end of the heating channel, respectively, the temperature rising region is set in one adjacent channel and the other adjacent channel Includes a cell in which the paired area is set, and
A pair of introduction paths for introducing fluid into the heating flow path, and a pair of lead-out paths for deriving fluid from the heating flow path,
One introduction path and one lead-out path are connected to the extension end of the one adjacent flow path, and the other lead-in path and the other lead-out path are connected to the extension end of the other adjacent flow path. Connected,
In the reverse flow state, the switching mechanism closes the other introduction path and one outlet path so that fluid from one introduction path is introduced into the cell and discharged from the other outlet path. In the positive flow state, the one introduction path and the other lead-out path are closed so that the fluid from the other lead-in path is introduced into the cell and led out from the one lead-out path. Can do.

  In order to equalize the flow rate flowing through the heating flow path in the normal flow state and the reverse flow state without using a flow rate controller or the like, each of the introduction paths is connected to a single introduction port into which the fluid flows. Is preferred.

To make it possible to freely set the flow rate through the heating flow path and to allow rapid temperature drop in the temperature rising region,
The heating channel and a pair of adjacent channels respectively extending from one end and the other end of the heating channel, the temperature rising region is set in one adjacent channel and the other adjacent flow A cell in which the above-mentioned paired area is set on the road;
A pair of introduction paths for introducing a fluid into the heating flow path;
A pair of outlet paths for leading the fluid from the heating channel;
One introduction path is connected between one end of the heating channel and the temperature raising region,
The other introduction path and the other lead-out path are connected to the extending end of the other adjacent flow path,
One lead-out path is connected to the extending end of one adjacent flow path,
In the reverse flow state, the switching mechanism closes the other introduction path, so that the fluid from one introduction path branches into the flow to the heating flow path and the one adjacent region, and then is led out from each outlet path. On the other hand, in the positive flow state, by closing one introduction path, the fluid from the other introduction path branches into the flow to one lead-out path and the heating flow path, and then each derivation It is desirable to be derived from the road.

  In this case, it is also necessary to make the flow rate on the derivation channel side variable. To that end, a derivation flow rate adjustment mechanism for adjusting the flow rate ratio of the fluid flowing in each derivation channel is further provided, and the control mechanism includes the derivation flow rate. It is preferable to control the ratio adjusting mechanism so that the flow rate flowing through the heating channel is equal in the normal flow state and the reverse flow state.

  In order to control the temperature drop, it is preferable that the control mechanism opens one introduction path so that the flow rate can be changed in the positive flow state.

  According to the present invention configured as described above, the simulated exhaust gas temperature in the opposite region is set to a desired target temperature, and the temperature-controlled heated simulated exhaust gas is installed at a stretch by switching the flow path. Since it is made to flow to a temperature range, the temperature increase rate in a temperature increase area | region can be improved dramatically compared with the past.

  In addition, since the paired region that is initially set to become the target temperature in the backflow state is designed to be thermally symmetric or symmetric with respect to the temperature rising region, the backflow state and the forward flow state are symmetrical. Thus, when the flow path is switched to a normal flow state, the temperature of the simulated exhaust gas in the temperature rising region can be accurately reached the target temperature without overshoot or non-reaching.

  Furthermore, since the fluid before the temperature rising flowing from the upstream passes through the temperature rising region in the reverse flow state, it is hardly affected by the temperature of the heating flow path downstream from it. The region can be reliably maintained at a predetermined low temperature state.

  Then, the above three points, that is, the temperature can be raised very quickly, the temperature of the heated region after heating can be accurately set to the target temperature, and the heated region before heating is set to a desired constant temperature (for example, normal temperature). When this fluid heating device is applied to, for example, a catalyst evaluation test device, it is possible to reproduce a situation very close to the actual engine start-up or high load, etc. It becomes possible to carry out with higher accuracy than in the past.

The schematic diagram which shows the flow of the simulation exhaust gas in a backflow state while showing the whole catalyst evaluation test apparatus in 1st Embodiment of this invention. The schematic diagram which shows the flow of the simulation exhaust gas in the normal flow state in the embodiment. The schematic diagram which shows the flow of the simulation exhaust gas in a backflow state while showing the whole catalyst evaluation test apparatus in 2nd Embodiment of this invention. The schematic diagram which shows the flow of the simulation exhaust gas in the normal flow state in the embodiment. The schematic diagram which shows the flow of the simulation exhaust gas in a backflow state while showing the whole catalyst evaluation test apparatus in 3rd Embodiment of this invention. The schematic diagram which shows the flow of the simulation exhaust gas in the normal flow state in the embodiment. The schematic diagram which shows the flow of the simulation exhaust gas in a backflow state while showing the whole catalyst evaluation test apparatus in 4th Embodiment of this invention. The schematic diagram which shows the flow of the simulation exhaust gas in the normal flow state in the embodiment.

  Hereinafter, a catalyst evaluation test apparatus 100 according to an embodiment of the present invention will be described with reference to the drawings.

  This catalyst evaluation test apparatus 100 is configured so that a simulated exhaust gas heated to a predetermined temperature is brought into contact with a catalyst W provided in an exhaust pipe of an engine, and its reaction can be evaluated and tested. As shown in FIG. 1, the introduced simulated exhaust gas is heated and brought into contact with the catalyst W accommodated therein, a pair of introduction paths 21 and 22 for introducing the simulated exhaust gas into the cell 1, and the cell 1 A pair of derivation paths 31 and 32 for deriving simulated exhaust gas, a switching mechanism 4 for switching the flow direction of the simulated exhaust gas in the cell 1 to forward and reverse, a control mechanism 5 for controlling the switching mechanism 4 and the like are provided. .

Each part will be described below.
The cell 1 extends from the heating flow path 13 that raises the temperature of the simulated exhaust gas, the heater 14 that is a temperature adjustment mechanism provided around the heating flow path 13, and one end and the other end of the heating flow path 13. And a pair of adjacent flow paths 11 and 12. One adjacent channel 11 extended from one end of the heating channel 13 is provided with a temperature raising region S1 for installing the catalyst W, and extended from the other end of the heating channel 13. In the other adjacent channel 12, a pair region S2 is set at a portion that is substantially symmetrical with the heating channel 13 across the heating channel S1. Note that “symmetric” may be thermally symmetric. Furthermore, in this embodiment, temperature sensors T1, T2, and T3 are provided at the central portions of the temperature raising region S1, the paired region S2, and the heating channel 13, respectively.

  Of the pair of introduction paths 21, 22, one introduction path 21 is connected to one end of the cell 1, that is, the extension end of one adjacent flow path 11, and the other introduction path 22 is the other of the cell 1. It is connected to the end, that is, the extended end of the other adjacent flow path 12. Further, the base ends of the introduction paths 21 and 22 are collectively connected to a single introduction port 23.

  Of the pair of lead-out paths 31, 32, one lead-out path 31 is connected to one end of the cell 1, that is, the extension end of one adjacent flow path 11, and the other lead-out path 32 is the other of the cell 1. It is connected to the end, that is, the extended end of the other adjacent flow path 12. Further, the terminal portions of the lead-out paths 31 and 32 are collectively connected to a single lead-out port 33.

  The switching mechanism 4 has a positive flow state in which the simulated exhaust gas passes through the pair region S2 and advances from the other end of the heating flow path 13 toward one end and passes through the temperature rising region S1, and the simulated exhaust gas is heated. The simulated exhaust gas state is selectively switched to either a reverse flow state that passes through the region S1 and flows from one end to the other end of the heating flow path 13 and passes through the paired region S2.

Specifically, this is provided with on-off valves 4I1, 4I2, 4O1, 4O2 provided in the introduction paths 21, 22 and the outlet paths 31, 32, respectively. As shown in FIG. The on-off valves 4I1 and 4O2 provided on 21 and the other lead-out path 32 are opened, and the on-off valves 4I2 and 4O1 provided on the other lead-in path 22 and one lead-out path 31 are closed. Can be generated.
Further, as shown in FIG. 2, the on-off valves 4I1 and 4O2 provided on the one introduction path 21 and the other lead-out path 32 are closed, and the open / close valves provided on the other introduction path 22 and the one lead-out path 31 are closed. The positive flow state can be generated by opening the valves 4I2 and 4O1.

  The control mechanism 5 includes, for example, a digital circuit including a CPU, a memory, an A / D converter, a D / A converter, a bus for connecting them, and an analog circuit connected to the periphery of the digital circuit (not shown). The CPU and its peripheral devices cooperate with each other in accordance with the program stored in the memory, thereby exhibiting a predetermined function.

Next, the operation of the catalyst evaluation test apparatus 100 will be described together with a specific function description of the control mechanism 5.
First, the operator installs the catalyst W in a holder provided in the temperature rising region S1 in the cell 1 and operates the catalyst evaluation test apparatus 100.
Then, the control mechanism 5 operates to control the switching mechanism 4 to generate a backflow state as shown in FIG. At this time, all of the simulated exhaust gas introduced from the introduction port 23 flows through the one introduction passage 21 and the counter region S2 from the heating passage 13.

  Next, the control mechanism 5 acquires the temperature of the simulated exhaust gas flowing in the counter area S2 from the temperature sensor T2 in the reverse flow state, and the heater is adjusted so that the temperature measured by the temperature sensor T2 falls within a preset target temperature range. 14 outputs are controlled. At this time, for example, if the measured temperature from the temperature sensor T3 installed in the center of the heating flow path 13 exceeds a predetermined rated temperature, the output of the heater 14 is lowered to give some alarm. May be.

  Thereafter, the control mechanism 5 confirms that the measured temperature of the paired region S2 is within the target temperature range and is stable, and then controls the switching mechanism 4 while maintaining the output of the heater 14 at that time. Make the simulated exhaust gas flow in the positive direction.

  At this time, as shown in FIG. 2, all the simulated exhaust gas introduced from the introduction port 23 flows through the temperature increase region S1 (catalyst W) from the heating passage 13 via the other introduction passage 22. Since the flow rate of the simulated exhaust gas to be introduced is kept constant by a flow controller or the like (not shown), the simulated exhaust gas having the same flow rate as that in the reverse flow state flows through the heating flow path 13 and the temperature raising region S1.

  After switching to the positive flow state, it is determined that the measured temperature increase rate in the temperature rising region S1 is equal to or less than a certain value, or a predetermined time corresponding thereto has elapsed, and then the measured temperature in the temperature rising region S1 is the target temperature, for example. The control mechanism 5 may control the output of the heater 14 so as to fall within the range.

  According to the catalyst evaluation test apparatus 100 according to the present embodiment configured as described above, the simulated exhaust gas temperature in the opposite region S2 is set to a desired target temperature, and the temperature-controlled heated simulated exhaust gas is switched over. Therefore, the temperature rise rate of the simulated exhaust gas flowing through the catalyst can be dramatically improved.

  In addition, the pair region S2 that is initially set to be the target temperature in the backflow state is designed to be thermally symmetric or close to symmetry with the temperature rising region S1 in which the catalyst W is installed. When the flow path is switched to the normal flow state, the simulated exhaust gas temperature in the temperature rising region S1 accurately reaches the target temperature without overshoot or non-reaching. Can be made.

  Further, the catalyst W in the reverse flow state is exposed to the normal temperature simulated exhaust gas flowing from the upstream and is hardly affected by the temperature of the heating flow path 13 downstream from the catalyst W before being heated. Can be reliably maintained at a predetermined low temperature state.

  And the above-mentioned three points, that is, that the temperature can be raised very quickly, that the temperature after heating can be accurately set to the target temperature, and that the catalyst before heating can be kept at a desired constant temperature (for example, room temperature). As a result, the evaluation test of the catalyst W at the time of starting the engine or at a high load can be performed with extremely high accuracy as compared with the conventional case.

[Second Embodiment]
Next, a second embodiment of the present invention will be described with reference to FIGS. In addition, the same code | symbol is attached | subjected to the member corresponding to the said 1st Embodiment.
In this embodiment, one introduction path 21 is connected between one end of the heating flow path 13 and the temperature raising region S1.

  Further, as the switching mechanism 4, a flow rate controller 4MO provided in the other lead-out path 32 is provided instead of the opening / closing valve provided in the lead-out paths 31 and 32 as in the first embodiment. That is, the opening / closing valve provided in each of the introduction paths 21 and 22 and the flow rate controller 4MO provided in the other lead-out path 32 play a role as the switching mechanism 4. Further, the flow rate controller 4MO also serves as a derived flow rate ratio adjusting mechanism for adjusting the flow rate ratio of the simulated exhaust gas flowing through the respective outlet passages 31 and 32. Therefore, it is also possible to provide the flow rate controller 4MO in one lead-out path 31.

  The open / close valves 4O1 and 4O2 provided in the lead-out paths 31 and 32 in the figure may be omitted because they remain open during operation. Reference numeral 6 provided upstream of the flow rate controller 4MO denotes a cooler for lowering the temperature of the simulated exhaust gas below the rated temperature of the flow rate controller 4MO, and is provided downstream of the flow rate controller 4MO. The code | symbol 7 has shown the pump for ensuring operation | movement of the flow controller 4MO.

The operation of the catalyst evaluation test apparatus 100 having such a configuration will be described below.
First, the operator installs the catalyst W in the holder set in the temperature rising region S1 in the cell 1 and operates the catalyst evaluation test apparatus 100.
Then, the control mechanism 5 operates to control the switching mechanism 4 to generate a backflow state as shown in FIG.

  Here, the flow of the simulated exhaust gas in the reverse flow state will be described. As shown in FIG. 3, the entire amount of the simulated exhaust gas flowing from the introduction port 23 passes through one introduction path 21 and flows toward the heating flow path 13 in the cell 1 and toward the temperature rising region S1 (catalyst W). Branch to.

  The simulated exhaust gas toward the heating flow path 13 is discharged from the paired region S2 through the other lead-out path 32 at the lead-out port 33. In addition, the simulated exhaust gas toward the temperature raising region S1 is similarly discharged from the outlet port 33 through one outlet path 31.

  As described above, since the entire amount of the simulated exhaust gas passing through the counter area S2 from the heating flow path 13 is guided to the other lead-out path 32, the control mechanism 5 is provided with a flow rate controller provided on the other lead-out path 32. 4MO is commanded to control the flow rate of the simulated exhaust gas flowing through the other lead-out path 32, that is, the flow rate of the simulated exhaust gas flowing through the heating flow path 13 to a predetermined control flow rate.

  On the other hand, since this target flow rate is set to be smaller than the flow rate of the simulated exhaust gas flowing from the introduction port 23, the remaining surplus simulated exhaust gas is discharged from the outlet port 33 through the temperature rising region S1.

  Next, as in the above embodiment, the control mechanism 5 acquires the temperature of the simulated exhaust gas flowing in the counter area S2 in the backflow state from the temperature sensor T2, and the temperature measured by the temperature sensor T2 is a preset target temperature range. Thus, the output of the heater 14 is controlled.

  The control mechanism 5 controls the switching mechanism 4 while maintaining the output of the heater 14 at that time after confirming that the measured temperature of the paired region S2 is stable within the target temperature range. Make the simulated exhaust gas flow in the positive direction.

  Here, the flow of the simulated exhaust gas in the positive flow state will be described. As shown in FIG. 4, the entire amount of the simulated exhaust gas flowing from the introduction port 23 passes through the other introduction path 22 and is heated in the cell 1. The flow branches to a flow toward the path 13 and a flow toward the other outlet path 32. The simulated exhaust gas toward the heating channel 13 is discharged from the outlet port 33 through the temperature rising region S1 (catalyst W) and one outlet channel 31. The simulated exhaust gas toward the other lead-out path 32 is discharged from the lead-out port 33.

  Incidentally, since the flow rate QF of the simulated exhaust gas passing through the heating flow path 13 needs to be equal to the flow rate QR in the reverse flow state, the control mechanism 5 controls the flow rate of the simulated exhaust gas flowing through the other lead-out path 32. Thus, the flow rate of the simulated exhaust gas passing through the heating flow path 13 is indirectly controlled.

Specifically, the difference flow rate _QF I2 _{-QR O2} minus the flow rate _{QF I2} flow _{QR O2} simulated exhaust gas from (known) through the other outlet passage 32 of the simulated exhaust gas flowing from the other introduction path 22, the heating channel 13, that is, the flow rate flowing through one outlet 31, the flow rate controller 4MO is configured so that the differential flow rate becomes equal to the flow rate QR of the simulated exhaust gas passing through the heating flow path 13 in the reverse flow state. setting the control flow rate _{QR O2} of the following equation (1).
QR _O2 = QF _I2 -QF
= QF _I2 -QR (1)

  Even with such a configuration, it is possible to obtain the same effects as those of the above-described embodiment. In addition, by changing the control flow rate of the flow rate controller 4MO, it is possible to freely set the flow rate that flows through the heating flow path 13 in both the forward and reverse states, thereby further improving the degree of freedom in the catalyst evaluation test. Can do.

[Third Embodiment]
Next, a third embodiment of the present invention will be described with reference to FIGS. In addition, the same code | symbol is attached | subjected to the member corresponding to the said embodiment.

  In the third embodiment, the flow path configuration is the same as that of the second embodiment, but the switching mechanisms 4 are provided with flow rate controllers 4MI1 and 4MI2 instead of the on-off valves provided in the introduction paths 21 and 22, respectively. is there. That is, these flow rate controllers 4MI1, 4MI2 and the flow rate controller 4MO provided in the other lead-out path 32 play a role as the switching mechanism 4.

Next, operation | movement of the catalyst evaluation test apparatus 100 of such a structure is demonstrated below.
First, the operator installs the catalyst W in the holder set in the temperature rising region S1 in the cell 1 and operates the catalyst evaluation test apparatus 100.

Then, the control mechanism 5 operates and controls the switching mechanism 4 (in other words, controls the flow rate controllers 4MI1, 4MI2, 4MO) to generate a backflow state as shown in FIG. The flow rate QR flowing through the heating flow path 13 in the reverse flow state is obtained from the following equation (2).
QR = QR _O2 −QR _I2 (2)
Here, QR _O2 represents the control flow rate of the derivation flow rate controller 4MO (flow rate flowing through the other derivation path 32), and QR _I2 represents the control flow rate of the other introduction flow rate controller 4MI2 (flow rate flowing through the other introduction path 22). ing.

  Therefore, the control mechanism 5 sets the control flow rates of the introduction flow rate controller 4MI2 and the derived flow rate controller 4MO so that the flow rate QR flowing through the heating flow path 13 becomes a predetermined value.

For example, as is apparent from equation (2), be determined to control the flow rate _{QR I2} of the other introduction flow controller 4MI2, the control flow rate _{QR O2} derivation flow controller 4MO unique to Sadamari following formula (3) become that way.
QR _O2 = QR _I2 -QR (3)

The flow rate QR _I1 of one introduction path 21 only needs to exceed QR, and the control mechanism 5 controls one introduction flow rate controller 4MI1 to pass through the temperature rising region S1 (catalyst W) and one lead-out path. The surplus flow rate QR-QR _I1 discharged from 31 sets the flow rate QR _I1 to such an extent that the temperature increase region S1 (catalyst W) can be kept at room temperature.

  Next, as in the above embodiment, the control mechanism 5 acquires the temperature of the simulated exhaust gas flowing in the counter area S2 from the temperature sensor T2 in the backflow state, and the temperature measured by the temperature sensor T2 becomes a preset target temperature range. Thus, the output of the heater 14 is controlled.

  Thereafter, the control mechanism 5 confirms that the measured temperature of the paired region S2 is within the target temperature range and is stable, and then controls the switching mechanism 4 while maintaining the output of the heater 14 at that time. As shown in FIG. 6, a positive flow state in which the simulated exhaust gas flows in the positive direction is set. At this time, one introduction path 21 is closed by one introduction flow rate controller 4MI1, so that the normal temperature simulated exhaust gas is not mixed in the temperature rising region S1.

The flow rate QF flowing through the heating flow path 13 in the positive flow state is expressed by the following equation (4).
QF = QF _I2 -QF _O2 (4)
Here, _{QF I2} is controlled flow rate of the other introduction flow controller 4MI2 (flow through the other inlet channel 22), _{QF O2} control flow derived flow controller 4MO a (flow rate through the other outlet passage 32) Represents.

Incidentally, since the flow rate QF flowing through the heating flow path 13 in the normal flow state needs to be equal to the flow rate QR in the reverse flow state, the control mechanism 5 controls the flow rate so that the flow rate QF becomes equal to the flow rate QR. The control flow rates QF _I2 and QF _O2 of the devices 4MI2 and 4MO are determined simultaneously with switching.

Specifically, for example, as is clear from the equation (4), if the control flow rate QF _I2 of the other introduction flow rate controller 4MI2 is determined, the control flow rate QF _O2 of the derived flow rate controller 4MO is uniquely determined. Equation (5) is obtained.
QF _O2 = QF _I2 −QF = QF _I2 −QR (5)
Even with such a configuration, the same effects as those of the second embodiment can be obtained.

  Further, in this embodiment, the temperature of the catalyst W can be rapidly lowered. That is, in the normal flow state, if the flow rate controller 4MI1 provided in one introduction path 21 is opened and a predetermined flow rate is flowed, the simulated exhaust gas at normal temperature is mixed with the simulated exhaust gas whose temperature has been increased. Thus, the temperature of the catalyst W can be rapidly lowered. At this time, if the flow rate of the simulated exhaust gas flowing through the other introduction path 22 is decreased, the flow rate of the simulated exhaust gas that has been heated is reduced, so that the temperature can be lowered more rapidly.

[Fourth Embodiment]
Next, a fourth embodiment of the present invention will be described with reference to FIGS. In addition, the same code | symbol is attached | subjected to the member corresponding to the said embodiment.

In the fourth embodiment, as shown in FIG. 7, compared to the third embodiment, the other introduction path 22 is connected between the other end of the heating flow path 13 and the pair region S2. The channel configuration is different. Further, as the temperature control mechanism, the heater 14 is kept constant at the rated output, and the temperature of the counter region S2 or the temperature rising region S1 is set by mixing the simulated low temperature exhaust gas from the introduction paths 21 and 22 with the heated simulated exhaust gas. The configuration is adjustable.
A specific example of the operation will be described.

First, in the reverse flow state, as shown in FIG. 7, the control mechanism 5 controls the introduction flow rate controller 4MI1 to set the flow rate of the simulated exhaust gas flowing through the one introduction path 21 to QR _I1 .

Next, the flow rate of the simulated exhaust gas flowing through the other introduction path 22 is controlled by giving a command to the introduction flow rate controller 4MI2 so that the measured temperature of the pair region S2 becomes a predetermined target temperature. As a result, it is assumed that the flow rate of the simulated exhaust gas flowing through the other introduction path 22 becomes QR _I2 .

On the other hand, the control mechanism 5 controls the derivation flow rate controller 4MO by giving a command so that the flow rate of the simulated exhaust gas flowing through the heating flow path 13 in the backflow state becomes a predetermined QR. Control flow _{QR O2} at that time is shown in the following equation (6).
QR _O2 = QR + QR _I2 (6)

Next, the control mechanism 5 generates a positive flow state shown in FIG.
Specifically, the control flow rate by each introduction flow rate controller 4MI1, 4MI2 is reversed. That is, the flow rate QF _{I1 of the} simulated exhaust gas flowing through one introduction path 21 is QR _I2, and the flow rate QF _{I2 of the} simulated exhaust gas flowing through the other introduction path 22 is QR _I1 .

At the same time, the control mechanism 5 controls the derived flow rate controller 4MO by giving a command so that the flow rate QF of the simulated exhaust gas flowing through the heating flow path 13 in the normal flow state becomes the flow rate QR in the reverse flow state. Control flow _{QF O2} at that time is shown in the following equation (7).
QF _O2 = QF _I2 -QF
= QR _I1 -QR (7)

  With such a configuration, the same effect as in the third embodiment can be obtained without controlling the heater output. Further, as in the third embodiment, the temperature of the catalyst W can be rapidly lowered.

The present invention is not limited to the above embodiment. For example, it is possible to change the part where the flow rate controller is provided, and the present invention can be applied not only to the catalyst evaluation test apparatus but also to various applications as long as the purpose is to heat the fluid to a predetermined temperature all at once. It is.
In addition, the present invention is not limited to the above embodiment, and various modifications can be made.

DESCRIPTION OF SYMBOLS 100 ... Catalyst evaluation test apparatus 1 ... Cell 11, 12 ... Adjacent channel 13 ... Heating channel 14 ... Temperature control mechanism (heater)
21, 22 ... Introducing paths 31, 32 ... Deriving paths 4 ... Switching mechanism 5 ... Control mechanism S1.

Claims (7)

A heating channel for heating the fluid;
A switching mechanism for switching and reversing the direction of the fluid flowing through the heating flow path between the forward direction and the reverse direction;
A temperature rising region through which the fluid flowing in the forward direction passes through the heating channel, and a paired region through which the fluid flowing in the reverse direction passes through the heating channel;
A temperature adjustment mechanism for adjusting the temperature of the fluid flowing through the temperature rising region and the paired region;
The temperature control mechanism is controlled so that the temperature of the fluid flowing in the counter area in the reverse flow state becomes a preset target temperature in a reverse flow state in which the fluid flows in the reverse direction by controlling the switching mechanism. And a control mechanism for controlling the switching mechanism so as to allow the fluid to flow in the positive direction. The heating channel and a pair of adjacent channels respectively extending from one end and the other end of the heating channel, the temperature rising region is set in one adjacent channel and the other adjacent flow A cell in which the above-mentioned paired area is set on the road;
A pair of introduction paths for introducing a fluid into the heating flow path;
A pair of outlet paths for leading the fluid from the heating channel;
One introduction path and one lead-out path are connected to the extension end of the one adjacent flow path, and the other lead-in path and the other lead-out path are connected to the extension end of the other adjacent flow path. Connected,
In the reverse flow state, the switching mechanism closes the other introduction path and one outlet path so that fluid from one introduction path is introduced into the cell and discharged from the other outlet path. In the positive flow state, by closing one introduction path and the other lead-out path, the fluid from the other introduction path is introduced into the cell and led out from the one lead-out path. Item 2. The fluid heating apparatus according to Item 1. The fluid heating device according to claim 2 , wherein each of the introduction paths is connected to a single introduction port through which fluid flows. The heating channel and a pair of adjacent channels respectively extending from one end and the other end of the heating channel, the temperature rising region is set in one adjacent channel and the other adjacent flow A cell in which the above-mentioned paired area is set on the road;
A pair of introduction paths for introducing a fluid into the heating flow path;
A pair of outlet paths for leading the fluid from the heating channel;
One introduction path is connected between one end of the heating channel and the temperature raising region,
The other introduction path and the other lead-out path are connected to the extending end of the other adjacent flow path,
One lead-out path is connected to the extending end of one adjacent flow path,
In the reverse flow state, the switching mechanism closes the other introduction path, so that the fluid from one introduction path branches into the flow to the heating flow path and the one adjacent region, and then is led out from each outlet path. On the other hand, in the positive flow state, by closing one introduction path, the fluid from the other introduction path branches into the flow to one lead-out path and the heating flow path, and then each derivation The fluid heating device according to claim 1, wherein the fluid heating device is derived from a path. Further comprising a derivation flow ratio adjustment mechanism for adjusting a flow ratio of the fluid flowing through each of the derivation paths;
The fluid heating device according to claim 4 , wherein the control mechanism controls the derived flow rate ratio adjusting mechanism so that the flow rate flowing through the heating flow path is equal in the normal flow state and the reverse flow state. The fluid heating device according to claim 4 , wherein the control mechanism opens one introduction path so that the flow rate can be changed in the positive flow state. A catalyst evaluation test apparatus using the fluid heating apparatus according to any one of claims 1 to 6 , wherein the fluid is simulated exhaust gas, and an exhaust gas catalyst can be installed in the temperature rising region. The catalyst evaluation test apparatus characterized by the above-mentioned.