JP5913197B2 - Saturated air temperature control method and spray corrosion test apparatus in spray corrosion test - Google Patents

Description

  The present invention relates to a saturated air temperature control method and a spray corrosion test apparatus in a spray corrosion test, and more particularly, to accurately control the temperature of saturated air introduced into a sprayer in a test tank for performing a spray corrosion test, and a corrosive solution during spraying. The present invention relates to a saturated air temperature control method and a spray corrosion test apparatus that prevent fluctuations in the concentration of water.

  Conventional spray corrosion test equipment is equipped with a sprayer consisting of an air nozzle and a liquid nozzle in a test tank, and the corrosive solution in the liquid nozzle is sucked up by the venturi effect of the compressed air ejected from the air nozzle. The sample is configured to be sprayed uniformly as fine particles on the sample in the test tank (see Non-Patent Document 1).

  When spraying a corrosive solution in a test tank from the past, if the corrosive solution is sprayed using dry compressed air, the concentration of the corrosive solution adjusted to a predetermined concentration will fluctuate. is there. Therefore, the density fluctuation | variation of the corrosive solution at the time of spraying is suppressed by passing dry compressed air through the water in an air saturator, and making it saturated air.

  By the way, when compressed saturated air is ejected from the sprayer into the test tank, the temperature is lowered by adiabatic expansion. Therefore, when injecting saturated air into the test tank, the water temperature of the air saturator is set to the temperature obtained from the correlation between the tank temperature and the spray pressure in order to obtain saturated air at the same temperature as the tank temperature. The compressed air was humidified and heated.

  For example, in the neutral salt spray test described in Non-Patent Document 2, the temperature in the spray chamber (test tank) is controlled to 35 ± 2 ° C., and the compressed air supplied to the sprayer is 10 times higher than the temperature in the spray chamber. It stipulates that it needs to be humidified and heated by passing it through a saturation tower (air saturator) having higher water than that. Although the water temperature in the saturation tower varies depending on the pressure used and the nozzle type of the sprayer, in Non-Patent Document 2, as an example, when the spray overpressure (spray pressure) is 98 kPa (0.098 MPa), the saturation tower (air saturator) The water temperature is controlled to 48 ° C.

  Hereinafter, "When the compressed saturated air is ejected from the nebulizer into the test chamber, it becomes saturated air having the same temperature as the chamber temperature. The air saturator is obtained from the correlation between the chamber temperature and the spray pressure of the saturated air. "Temperature to be controlled" is called "Induction value" of compressed saturated air. In addition, the temperature in a tank means the temperature in the test tank defined by the standard of the spray corrosion test.

JIS Z2371: 2000 “Salt spray test method” ISO 9227: 2012 "Corrosion tests in artificial atmospheres-Saltspray tests"

As described above, in the conventional spray corrosion test apparatus, when the corrosive solution is sprayed into the test tank using the compressed saturated air, the water temperature in the air saturator is set to the “induction value”, and this air Saturated air that had been humidified and heated through the saturator was introduced into a sprayer in the test chamber.
However, the temperature of the saturated air introduced into the nebulizer is an indirect control controlled by the water temperature in the air saturator, is not directly controlled, and has the following problems.

  When the water level of the air saturator drops, the saturated air is cooled at the top of the air saturator, and saturated air with a temperature lower than the water temperature controlled to the “inductive value” in the air saturator Will be introduced. Therefore, when this saturated air is ejected from the air nozzle of the sprayer, the temperature is further lowered by adiabatic expansion, and becomes saturated air having a temperature lower than the temperature in the tank. Since the saturated air having a temperature lower than the temperature in the tank is immediately heated by the atmosphere in the tank, it becomes unsaturated air. As a result, the moisture of the corrosive solution that has become fine particles may be evaporated by the unsaturated air, and the concentration of the corrosive solution may increase.

  Moreover, when passing through the conduit | pipe which connects the sprayer and air saturator in a test tank, saturated air may be cooled and the water | moisture content in saturated air may condense and produce a water droplet. When these water droplets are mixed with saturated air and ejected from the air nozzle of the atomizer, the water droplets are combined with the corrosive solution that has become fine particles, which may reduce the concentration of the corrosive solution.

  Furthermore, in the spray corrosion test, it is known that the spray amount of the corrosive solution can be adjusted by changing the spray pressure of saturated air. However, in the conventional spray corrosion test apparatus, the set values are fixed to the conditions described in Non-Patent Document 1 (spray pressure 0.098 ± 0.01 MPa, air saturator water temperature 47 ± 2 ° C.). Therefore, when the corrosive solution is sprayed at a spray pressure different from the value set at the time of shipment to adjust the spray amount, a new “induction value” obtained from the correlation between the tank temperature and the spray pressure is used. The engineer had to manually change the temperature setting of the saturated air so that

  The present invention has been made in order to solve the above-mentioned problems, and directly controls the temperature of saturated air introduced into the sprayer in the test tank, and introduces saturated air at a constant temperature into the sprayer to cause corrosivity during spraying. It is an object of the present invention to realize a saturated air temperature control method and a spray corrosion test apparatus that can prevent fluctuations in solution concentration.

  In addition, even when adjusting the spray amount by adjusting the temperature of the saturated air to the “induction value” and changing the spray pressure, the saturated air temperature control method and the spray that can introduce saturated air at a predetermined temperature into the test tank The purpose is to realize a corrosion tester.

  In order to achieve the above object, the present invention provides a flow path for introducing compressed air into saturated air by passing the compressed air through the air saturator in the saturated air temperature control method in the spray corrosion test, A first temperature sensor is provided in any part of a conduit connecting the upper part of the air saturator and the air saturator and the sprayer, the temperature of the saturated air introduced into the sprayer is measured, and based on the measured temperature information The control unit operates the first heater in the air saturator to control the temperature of the saturated air.

In addition to the above, the method for controlling the saturated air temperature in the spray corrosion test of the present invention may be arranged such that the first temperature sensor is located at any position above the air saturator or in the vicinity of the connection with the air saturator in the conduit On the other hand, a second temperature sensor located in the vicinity of the connection portion of the conduit with the sprayer and a second heater covering the entire conduit are provided, and measured by the first temperature sensor and the second temperature sensor. The temperature information of the saturated air is sent to the control unit, and the second heater is operated so that the saturated air sent to the sprayer becomes the saturated air having the same temperature as the temperature inside the test tank based on the temperature information. And saturated air is heated.

  In addition to the above, the saturated air temperature control method in the spray corrosion test of the present invention can arbitrarily set the pressure of the compressed air, and the control unit allows the saturated air introduced into the sprayer to be in the test tank. The temperature of the saturated air is set to the temperature obtained from the correlation between the temperature in the tank and the actual pressure measured by the air saturator so that saturated air having the same temperature as the temperature in the tank is obtained when jetting. Features.

  The spray corrosion test apparatus in the spray corrosion test of the present invention comprises a compressor that generates compressed air, a pressure adjusting means that controls the pressure of the compressed air, an air saturator that makes the compressed air saturated, and a compressed air. Humidification means for passing saturated water through the water in the air saturator, a first heater for heating the water in the air saturator, and a conduit for sending the saturated air from the air saturator to the sprayer in the test chamber A first temperature sensor located in any part of the conduit from the top of the air saturator, which is a flow path for introducing saturated air into the nebulizer to measure the temperature of the saturated air; and the first temperature sensor And a control unit for controlling the first heater based on the temperature information measured in (1).

In addition to the above, the spray corrosion test apparatus in the spray corrosion test according to the present invention may be configured such that the first temperature sensor is placed at any location near the connection with the air saturator in the upper part of the air saturator or in the conduit. provided, located in the connecting portion vicinity of the sprayer of the conduit, wherein the temperature of the saturated air just before introducing the nebulizer was determined, and a second temperature sensor to output the temperature information to the control unit, of said conduit The second heater is provided so as to cover the whole, and is controlled by the control unit.

  In addition to the above, the spray corrosion test apparatus in the spray corrosion test according to the present invention enables the pressure adjusting means to arbitrarily set the pressure of the compressed air passed through the air saturator, and the control unit is provided in the air saturator. Based on the information of the pressure sensor that measures the pressure of saturated air, the saturated air to be introduced into the sprayer in the test tank is saturated so that it becomes saturated air at the same temperature as the temperature inside the test tank. It is characterized by setting the temperature of air.

  Since the saturated air temperature control method and the spray corrosion test apparatus in the spray corrosion test of the present invention are as described above, the temperature of the compressed saturated air introduced into the sprayer in the test tank can be directly controlled. Further, by heating at the position of the conduit, the temperature of the saturated air can be maintained at the temperature set by the air saturator until it is introduced into the sprayer. Therefore, the compressed saturated air can be introduced into the sprayer without fluctuation in temperature, and fluctuations in the concentration of the corrosive solution during spraying can be prevented.

  Furthermore, since the temperature of the saturated air can be controlled based on the actual spray pressure, even when the spray pressure is set to a value different from the general control value, Saturated air having the same temperature as that of the aqueous solution can be prevented, and fluctuations in the concentration of the corrosive solution can be prevented.

It is a block diagram of the spray corrosion test apparatus of this invention (Example 1). It is a block diagram of the spray corrosion test apparatus of this invention (Example 2). (Example 3) which is a block diagram of the spray corrosion test apparatus of this invention.

  Hereinafter, examples of the present invention will be described in detail with reference to the drawings, but the present invention is not limited thereto.

  FIG. 1 shows a spray corrosion test apparatus in Example 1 of the present invention.

  The spray corrosion test apparatus 1 includes a compressor 2 for generating compressed air, a pressure adjusting means 3 for controlling the pressure of the compressed air, an air saturator 4 for making the compressed air into saturated air, and an air saturator for compressing air. Humidification means 5 for passing saturated water through the water in 4, a first heater 6 for heating the water in the air saturator 4, and a conduit for sending the saturated air from the air saturator 4 to the sprayer 9 in the test tank 8. 12, a first temperature sensor 14 located in any part of the conduit 12 from the top of the air saturator 4, which is a flow path 13 for introducing saturated air into the nebulizer 9 in order to measure the temperature of the saturated air, A control unit 100 that controls the first heater 6 based on the temperature information measured by the one temperature sensor 14 is provided.

In this spray corrosion test apparatus 1, an air saturator 4 and an air nozzle 10 of a sprayer 9 in a test tank 8 are connected by a conduit 12, while a corrosive solution in a solution tank 17 is supplied to a liquid nozzle 11 of the sprayer 9. A supply pipe 18 to be supplied is connected. The position where the air saturator 4 and the conduit 12 are connected is preferably the ceiling surface of the air saturator 4 in order to quickly introduce the saturated air rising from the bottom of the air saturator 4 into the sprayer 9. The upper side surface of the air saturator 4 may be used as long as water does not flow into the conduit 12. The conduit 12 is preferably heat-insulated to prevent the saturated air generated from the air saturator 4 from being cooled while passing through the conduit 12.
An operation panel 19 having a touch panel 20 is provided on the front surface of the spray corrosion test apparatus 1. The touch panel 20 has a display screen for displaying various information related to the operation state of the spray corrosion test apparatus 1 and a screen for operation, and has a function of detecting a contact operation on the display screen.

  The pressure adjusting means 3 is installed in the middle of the piping connecting the compressor 2 and the humidifying means 5 and controls the pressure value of the compressed air supplied to the air saturator 4. Generally, a pressure control valve capable of controlling and adjusting the pressure is used. Although it is installed at the above position in the present embodiment, it may be installed as a part of the components constituting the compressor 2. The pressure adjusting means 3 has a pressure adjusting unit (not shown). The pressure adjusting unit sets the pressure value by the pressure operation panel, and generates a signal for operating the pressure adjusting means 3 by an arithmetic device such as a microcomputer, thereby automatically controlling the pressure to the set value. Note that other types of adjusting mechanisms may be used for the pressure adjusting unit.

  The humidifying means 5 is installed in the bottom of the air saturator 4 and communicates with the compressor 2 installed outside the air saturator 4. The humidifying means 5 is generally a circular or horseshoe-shaped metal tube that allows gas to pass therethrough, and a foamed tube having pores for foaming the gas is generally used.

  The first temperature sensor 14 is provided above the air saturator 4 on the upstream side of the flow path 13 for saturated air. The first temperature sensor 14 is, for example, a thermocouple or a platinum resistance temperature sensor, but a sensor having another configuration may be used. Here, the reason why the first temperature sensor 14 is provided in the upper part of the air saturator 4 is that the saturated air generated by the humidifying means 5 is reduced in the air saturator 4 when the water level in the air saturator 4 is lowered. This is because it is suitable for directly measuring the saturated air temperature just before entering the conduit 12 in consideration of cooling before reaching the upper part. In the present embodiment, it is preferable to provide the first temperature sensor 14 on the upper portion of the air saturator 4 for the above reason. However, if it is in the flow path 13 of the saturated air, for example, the air saturator 4 in the conduit 12 and The first temperature sensor 14 may be provided in the vicinity of the connecting portion. Further, the first temperature sensor 14 outputs temperature information to the control unit 100.

  The control unit 100 uses a computer, and according to various data such as a predetermined program stored in a memory in advance and a spray time of a spray corrosion test set in advance, a set temperature of a test tank or a corrosive solution, a CPU, A spray corrosion test is performed by operating peripheral devices. These data may be input by operating the touch panel 20, for example. The control unit 100 includes a temperature setting unit 101 for setting an “inductive value” of saturated air in the air saturator 4, an “inductive value” and temperature information of the saturated air detected by the first temperature sensor 14. Is provided, and a temperature control unit 102 is provided that controls the first heater 6 by giving an output signal so that the temperature information detected by the first temperature sensor 14 becomes an “induction value”.

  The pressure sensor 16 is provided in the upper part of the air saturator 4 and measures the pressure of the saturated air in the air saturator 4. The pressure sensor 16 is a distortion gauge type that converts a change in electric resistance generated by the deformation of the diaphragm into an electric signal, or a capacitance type that detects the deformation of the diaphragm as a capacitance. A sensor may be used. The measured value of the pressure sensor 16 is displayed on a pressure display unit (not shown) connected to the pressure sensor 16, and the tester can check the pressure of saturated air.

  A saturated air temperature control method by the spray corrosion test apparatus 1 of FIG. 1 will be described.

  The compressed air sent from the compressor 2 is introduced into the humidifying means 5 near the bottom of the air saturator 4 and passes through the water in the air saturator 4 to become saturated compressed air, that is, “saturated air”. In the present embodiment, the pressure of the air supplied from the compressor 2 to the air saturator 4 is set and controlled by the pressure adjusting means 3 at 0.098 MPa defined in the standard of a general spray corrosion test. Thereafter, the compressed saturated air is introduced from the upper part of the air saturator 4 into the sprayer 9 through the inside of the conduit 12 and is ejected from the air nozzle 10. At this time, the corrosive solution in the liquid nozzle 11 is sucked up by the venturi effect of the saturated air ejected from the air nozzle 10, and the corrosive solution is sprayed as fine particles on the sample S placed in the test tank 8. .

  At this time, the first temperature sensor 14 directly measures the temperature of the compressed saturated air at the upper part in the air saturator 4 on the upstream side of the saturated air flow path 13. The temperature information measured by the first temperature sensor 14 is input to the control unit 100. The temperature control unit 102 of the control unit 100 includes a first heater in the air saturator 4 based on the “induction value” of saturated air set in advance by the temperature setting unit 101 and the temperature information input from the first temperature sensor 14. An output signal is given to 6 and controlled. The first heater 6 is an “inductive value” for spraying the saturated air temperature measured by the first temperature sensor 14 as saturated air having the same temperature as the temperature in the tank when spraying in the test tank 8. The water in the air saturator 4 is heated to 47 ° C. when the spraying pressure is 0.098 MPa.

  As described above, in the spray corrosion test apparatus 1 and the saturated air temperature control method of this embodiment shown in FIG. 1, when the saturated air compressed is introduced into the sprayer 9 in the test tank 8, the air saturator 4. The controller 100 controls the first heater 6 in the air saturator 4 based on the temperature information of the first temperature sensor 14 provided in the flow path 13 through which the saturated air passes, instead of the water temperature of the saturated air. Since the temperature is directly controlled, saturated air compressed into the sprayer 9 can be introduced without the set temperature changing, and fluctuations in the concentration of the corrosive solution during spraying can be prevented.

FIG. 2 shows the structure of a spray corrosion test apparatus in Example 2 of the present invention.
In the following second embodiment, portions having the same functions as those of the first embodiment will be described with the same reference numerals.

In addition to the structure of the spray corrosion test apparatus 1 of the first embodiment, the spray corrosion test apparatus 1 ′ is provided with the first temperature sensor 14 on the upstream side of the flow path 13 and the sprayer 9 located on the downstream side of the flow path 13. A second temperature sensor 15 that measures the temperature of saturated air immediately before being introduced into the sensor and outputs the temperature information to the control unit 100, and a second heater that is provided so as to cover the entire conduit 12 and is controlled by the control unit 100 7 is provided.

  The second heater 7 is provided so as to cover the conduit 12 that connects the air saturator 4 and the sprayer 9. Although the second heater 7 of the present embodiment is provided so as to cover the entire conduit 12, for example, when the conduit 12 is in an environment where it is difficult to cool, it may be provided so as to cover only a part of the conduit 12. Further, the heating of the second heater 7 is controlled by the control unit 100.

  The first temperature sensor 14 is provided in the upper part of the air saturator 4 on the upstream side of the saturated air flow path 13 as in the first embodiment. The position of the first temperature sensor 14 is preferably provided in the upper part of the air saturator 4 for the same reason as in the first embodiment. The first temperature sensor 14 may be provided in the vicinity of the connection portion with the air saturator 4 in the inside 12.

  On the other hand, the second temperature sensor 15 is provided in the vicinity of the connection portion with the sprayer 9 of the conduit 12 on the downstream side of the saturated air flow path 13. As the second temperature sensor 15, a thermocouple or a platinum resistance thermometer is used similarly to the first temperature sensor 14, but a sensor having another configuration may be used. The second temperature sensor 15 of this embodiment is provided in contact with the outer peripheral surface of the conduit 12, but may be provided inside the conduit 12 in order to measure the temperature of the saturated air in the conduit 12 with higher accuracy. Good. The second temperature sensor 15 outputs temperature information to the control unit 100. A temperature deviation control unit 103 is provided in the control unit 100.

  A saturated air temperature control method using the spray corrosion test apparatus 1 ′ in FIG. 2 will be described.

The feature of the control method of the saturation air temperature of the present embodiment is as follows in addition to the control method of the first embodiment.
The temperature on the upstream side of the flow path 13 of the saturated air that has passed through the water in the air saturator 4 and has been humidified and heated is measured by a first temperature sensor 14 provided in the upper part of the air saturator 4.
Further, the temperature of the saturated air immediately before being introduced into the sprayer 9 from the air saturator 4 through the conduit 12 is measured by a second temperature sensor 15 provided in the vicinity of the connection portion of the conduit 12 with the sprayer 9. .

  The temperature information of the saturated air in the upstream portion of the flow path 13 measured by the first temperature sensor 14 is input to the control unit 100. Similarly, temperature information of saturated air in the downstream portion of the flow path 13 measured by the second temperature sensor 15 is also input to the control unit 100.

  The temperature deviation control unit 103 in the control unit 100 is based on the temperature information measured by the first temperature sensor 14 and the second temperature sensor 15, and the temperature of the saturated air in the air saturator 4 (in the case of this embodiment, “ The induction value ") is compared with the temperature of saturated air immediately before being introduced into the sprayer 9, and the temperature of the saturated air immediately before being introduced into the sprayer 9 is" inductive value "so as to cover the conduit 12. The second heater 7 is controlled by giving an output signal.

  The second heater 7 is heated by the control of the control unit 100 until the temperature of the saturated air passing through the inside of the conduit 12 reaches an “induction value”. The temperature control of the second heater 7 is normally performed by an ON / OFF operation that is easy to control, but may be controlled by a proportional operation or a PID operation.

  As described above, in the spray corrosion test apparatus 1 ′ and the saturated air temperature control method of the present embodiment shown in FIG. 2, the first temperature sensor 14 and the second temperature provided respectively on the upstream side and the downstream side of the flow path 13. Since the temperature of the saturated air is measured by the sensor 15 and the second heater 7 of the conduit 12 is controlled based on the temperature information, the temperature of the saturated air introduced into the sprayer 9 can be kept constant. The fluctuation of the concentration of the corrosive solution at the time can be prevented.

FIG. 3 shows a block diagram of a spray corrosion test apparatus according to the present invention.
In the following third embodiment, parts having the same functions as those of the second embodiment will be described with the same reference numerals.

  In addition to the structure of the spray corrosion test apparatus 1 ′ of the second embodiment shown in FIG. 2, the spray corrosion test apparatus of the present embodiment arbitrarily sets the pressure of the compressed air that the pressure adjusting means 3 passes through the air saturator 4. The control unit 100 enables the saturated air to be introduced into the sprayer 9 in the test tank 8 based on the information of the pressure sensor 16 that measures the pressure of the saturated air in the air saturator 4 to spray in the test tank 8. The temperature of the saturated air is set so that the saturated air has the same temperature as the temperature inside the tank.

  When the compressed saturated air introduced into the sprayer 9 in the test tank 8 is jetted in the test tank 8, the temperature setting unit 101 in the control unit 100 becomes saturated air having the same temperature as the temperature in the tank. In addition, a new “induction value” is set from the tank temperature set in advance and the actual pressure information measured by the pressure sensor 16. The temperature control unit 102 controls the temperature of the saturated air based on the new “induction value”.

  The saturated air temperature control method by the spray corrosion test apparatus provided with the control part 100 shown in FIG. 3 is demonstrated.

In addition to the saturation air temperature control method of the second embodiment, the feature of the saturation air temperature control method of the present embodiment is as follows.
That is, the pressure of the compressed air can be arbitrarily set, and the control unit 100 becomes saturated air having the same temperature as the temperature in the tank when the saturated air introduced into the sprayer 9 is ejected in the test tank 8. Thus, it controls so that it may become the temperature calculated | required from the correlation of the tank internal temperature and the actual pressure measured with the air saturator 4. FIG.

  The pressure of the compressed air sent from the compressor 2 to the humidifying means 5 in the air saturator 4 is set by a pressure adjusting unit (not shown) of the pressure adjusting means 3. The pressure value of the compressed air set here is based on the spray amount of the corrosive solution that has become fine particles falling on the sample S, and the control range of the spray pressure described in Non-Patent Document 2 is 0.07 to 0.17 MPa. To be set arbitrarily by the examiner. Generally, when the spray pressure is set to a low pressure, a low spray amount is obtained, and when the spray pressure is set to a high pressure, a high spray amount is obtained.

  The pressure sensor 16 installed in the upper part of the air saturator 4 measures the pressure value of the saturated air sent from the compressor 2 into the air saturator 4, and the pressure information is input to the control unit 100. The The temperature setting unit 101 in the control unit 100 has a tank internal temperature set in advance so that saturated air to be introduced into the sprayer 9 is jetted in the test tank 8 to become saturated air having the same temperature as the tank internal temperature. A new “induction value” is set based on the actual pressure information input from the pressure sensor 16. Thereafter, the temperature control unit 102 controls the first heater 6 based on the new “induction value” and the temperature information input from the first temperature sensor 14.

  Here, a method of setting the “induction value” of saturated air when the pressure is changed by the temperature setting unit 101 will be described.

ここで、大気圧Ｐ_Ａは標準気圧０．１０１３２５ＭＰａとする。 If the atmospheric pressure is P _A , the pressure value of saturated air in the air saturator 4 measured by the pressure sensor 16 is P _B , and the saturated vapor pressure of water having the same temperature as the temperature in the test tank 8 is P _sat1 , The saturated vapor pressure P _{sat2 of the} water temperature that becomes the “induction value” of saturated air is obtained by the following equation (1).

Here, the atmospheric pressure _{P A} is the standard pressure 0.101325MPa.

In this embodiment, in order to increase the spray amount of the corrosive solution that has become fine particles, the pressure value of compressed air controlled by the pressure adjusting means 3 and the pressure value P _B of saturated air measured by the pressure sensor are set to 0. 135 MPa.

In the temperature setting unit 101, the relationship between the water temperature and the saturated vapor pressure as shown in the following table (1) is recorded as data. Since the temperature in the tank of the salt spray test specified in JIS Z2371 is 35 ° C., the saturated vapor pressure P _sat1 of water having the same temperature as the temperature in the tank in the equation (1) of this example is recorded in the temperature setting unit 101. It is 42.2 mmHg from the measured data.

When calculated by using the formula from the saturated vapor pressure P _sat1 pressure value P _B and the chamber temperature and the same temperature of the water in the saturated air in the air saturator 4 (1), the water temperature as the "induction value" of saturated air The saturated vapor pressure P _sat2 is 97.175 mmHg.

The temperature setting unit 101 uses the water temperature, which is the saturated vapor pressure closest to the saturated vapor pressure value calculated by the equation (1), as the “induction value” of saturated air set by the air saturator, and the temperature of water and saturated steam. Select from pressure relationship data (Table 1). In this embodiment, the calculated saturated vapor pressure value P _sat2 is 97.175 mmHg, so the “induction value” of saturated air is 51 ° C., which is the saturated vapor pressure closest to the saturated vapor pressure value.

  As described above, in the spray corrosion test apparatus 1 and the saturated air temperature control method including the control unit 100 shown in FIG. 3, the pressure of the air sent to the air saturator 4 can be arbitrarily set, and the air saturator 4 Even when the pressure is changed by setting the temperature of the saturated air based on the pressure value measured by the pressure sensor 16 provided therein, when the pressure is changed, the temperature is the same as the temperature in the tank. Since saturated air can be used, the spray amount of the corrosive solution in the test tank 8 can be adjusted, and fluctuations in concentration can be prevented.

  In the present embodiment, an example of a configuration provided with the second heater 7 and the first temperature sensor 14 and the second temperature sensor 15 respectively positioned upstream and downstream of the flow path 13 is shown. It is not limited to this. For example, even in the spray corrosion test apparatus 1 provided with only one first temperature sensor 14 of FIG. 1, the pressure of the compressed air can be arbitrarily set, and the temperature of the saturated air is obtained from the correlation with the actual spray pressure. It can be controlled to “induction value”.

  In the present embodiment, the pressure of the saturated air is controlled independently of the temperature by a pressure adjusting unit (not shown) of the pressure adjusting means 3. For example, a pressure setting unit (not shown) is provided in the control unit 100. Alternatively, a pressure set value may be input by the touch panel 20 for inputting various data to the control unit 100, and an output signal may be given to the pressure adjusting means 3 for control.

DESCRIPTION OF SYMBOLS 1, 1 'Spray corrosion test apparatus 2 Compressor 3 Pressure adjustment means 4 Air saturator 5 Humidification means 6 1st heater 7 2nd heater 8 Test tank 9 Sprayer 10 Air nozzle 11 Liquid nozzle 12 Pipe 13 Flow path 14 1st temperature sensor DESCRIPTION OF SYMBOLS 15 2nd temperature sensor 16 Pressure sensor 17 Solution tank 18 Supply pipe 19 Operation panel 20 Touch panel 100 Control part 101 Temperature setting part 102 Temperature control part 103 Temperature deviation control part

S sample

Claims (6)

  In the saturated air temperature control method in the spray corrosion test, compressed air is passed through an air saturator to form saturated air, and the saturated air is introduced into the sprayer. The upper part of the air saturator, the air saturator, and the A first temperature sensor is provided in any part of the conduit connecting the sprayer, the temperature of the saturated air introduced into the sprayer is measured, and the control unit controls the first heater in the air saturationr based on the measured temperature information And controlling the saturated air temperature in the spray corrosion test. The first temperature sensor is provided at any location near the connection with the air saturator in the conduit or at the top of the air saturator, while the second temperature sensor is located near the connection with the sprayer in the conduit . A temperature sensor and a second heater that covers the entire conduit are provided, temperature information of saturated air measured by the first temperature sensor and the second temperature sensor is sent to the control unit, and the temperature information is based on the temperature information. 2. The spray corrosion according to claim 1, wherein the second heater is operated to heat the saturated air so that the saturated air sent to the sprayer becomes saturated air having the same temperature as the inside temperature in the test tank. Saturated air temperature control method in the test.   The pressure of the compressed air can be arbitrarily set, and the control unit allows the saturated air introduced into the sprayer to become saturated air having the same temperature as the temperature in the tank when jetted in the test tank. 3. The saturated air temperature control method in the spray corrosion test according to claim 1, wherein the temperature of the saturated air is set to a temperature obtained from a correlation between an internal temperature and an actual pressure measured by the air saturator. .   A compressor for generating compressed air; pressure adjusting means for controlling the pressure of the compressed air; an air saturator for making compressed air into saturated air; and saturated air by passing compressed air through water in the air saturator; Humidifying means, a first heater for heating water in the air saturator, a conduit for sending saturated air from the air saturator to a sprayer in a test tank, and saturated air for measuring the temperature of the saturated air. A first temperature sensor located in any part of the conduit from above the air saturator, which is a flow path to be introduced into the sprayer, and the first heater based on temperature information measured by the first temperature sensor A spray corrosion test apparatus comprising: a control unit that controls The first temperature sensor is provided in any part of the conduit in the vicinity of the connection with the air saturator in the upper part of the air saturator, and located in the vicinity of the connection of the conduit with the sprayer. A second temperature sensor that measures the temperature of the saturated air immediately before being introduced to the controller and outputs the temperature information to the controller, and a second heater that is provided so as to cover the entire conduit and is controlled by the controller The spray corrosion test apparatus according to claim 4, wherein   The pressure adjusting means can arbitrarily set the pressure of the compressed air that passes through the air saturator, and the control unit is based on information from a pressure sensor that measures the pressure of the saturated air in the air saturator. 6. The temperature of the saturated air is set so that the saturated air introduced into the inside sprayer becomes saturated air having the same temperature as the temperature inside the tank when the saturated air is ejected in the test tank. Spray corrosion test equipment.

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