JP7033335B2 - Sensor tube structure for temperature and humidity measurement in compressed pneumatic circuit - Google Patents

Description

The present invention relates to the structure of a sensor tube connected to a piping line for measuring the temperature and humidity of compressed air in a compressed pneumatic circuit.

The compressed air generated by the air compressor is used for food processing, finishing processing of precision equipment such as lenses, end processing such as cleaning, and various other uses. Depending on the application of the compressed air, various devices are arranged in the middle of the pneumatic circuit from the air compressor to the discharge of the compressed air. For example, when it is used in an application where it is strictly prohibited to take out water, a configuration is adopted through an air dryer in the middle of the pneumatic circuit, and further, water, oil, sludge and microorganisms that could not be completely removed in the subsequent stage of the air dryer are adopted. In order to remove the above, an air filter made of resin or paper and having a net-like or hollow fiber membrane-like shape or an air filter wrapped with activated carbon is arranged.

By the way, in the configuration of the compressed pneumatic circuit as described above, the heated compressed air discharged by the air compressor is cooled in the piping line, and the amount of saturated water vapor under pressure decreases, so that drainage occurs. obtain. The saturated water vapor amount fluctuates in proportion to the temperature and also in the pressure, and the saturated water vapor amount is a known fact as shown in the table according to the JIS standard of FIG. The boundary temperature at which the amount of saturated water vapor becomes the limit and dew condensation occurs is generally called the dew point temperature. Therefore, if the temperature and humidity are known, it is possible to determine whether or not dew condensation (drain) can occur from the comparison between the saturated water vapor amount and the humidity at the temperature.

As described above, the amount of saturated water vapor also fluctuates depending on the pressure. That is, as the pressure rises, the amount of saturated water vapor also rises accordingly. The saturated water vapor amount shown in FIG. 3 shows a numerical value under atmospheric pressure, and in the compressed air in the compressed pneumatic circuit as in the present invention, the saturated water vapor amount at the same temperature is higher than that under atmospheric pressure. Will be done. The table shown in FIG. 4 is a comparison / conversion table of dew point temperatures under atmospheric pressure and pressurization. By using this, it is possible to convert the temperature of the compressed air to the dew point temperature in the case of atmospheric pressure, and to calculate the saturated water vapor amount using the table shown in FIG.

As a configuration of a conventional compressed pneumatic circuit, a technical proposal of "a drain discharge method and a drain discharge mechanism of an air compressor" according to Japanese Patent Application Laid-Open No. 2010-84736 (Patent Document 1) is publicly known. Specifically, the purpose is to efficiently discharge the drain in response to the change in the amount of drain generated due to the change in the operating environment of the air compressor, and the intake air sucked into the compressed pneumatic circuit. By actually measuring the temperature and humidity of the above, the amount of drainage generated per unit time is calculated, and a mode is adopted in which the amount of drainage generated and the amount of drainage discharged are matched.

However, compressed air constantly changes in temperature as it passes through various devices and piping lines, and the humidity also changes depending on the measurement location due to the generation and discharge of drainage in various devices and piping lines. It is something to do. The technical proposal according to Patent Document 1 does not measure the temperature and humidity of the compressed air itself, but measures only the temperature and humidity of the outside air sucked into the compressed air pressure circuit. It is not possible to cope with the temperature and humidity that change depending on the measurement point of the compressed air flowing through the compressed air pressure circuit, and as a result, it is difficult to measure the accurate dew point, so the amount of drainage generated is estimated tentatively. It was only obtained, and it could not be said that the estimated drainage amount and the actual generated amount could always match.

In view of the above problems, the applicant has invented a structure in which a sensor tube is arranged at a predetermined intermediate position in a piping line as shown in FIG. 1 and the temperature and humidity in the sensor tube are measured by a sensor. Has already been filed as "Temperature and Humidity Measurement Structure in Compressed Pneumatic Circuit" (Japanese Patent Application No. 2019-193176). According to the invention of the present application, it is possible to accurately measure the temperature and humidity in the compressed air without giving stress to the flow of the compressed air, and the state in which drainage can be generated in the compressed air based on the measurement result. It is possible to easily and immediately determine whether or not the air is present.
However, due to the structure of the sensor tube, the compressed air may partially leak depending on the arrangement of the sensor provided for measuring the temperature and humidity, and as a result, it is contained in the leaked compressed air. It is assumed that there will be a discrepancy in determining the presence or absence of a drain generation state depending on the amount of water vapor generated.

Therefore, the applicant focused on the problem that it is not possible to accurately determine the presence or absence of a drain generation state due to the leakage of compressed air in the sensor tube, and by making structural improvements to the sensor tube, the leakage of compressed air was prevented. Based on the idea that it is not possible to accurately determine the state of drainage, we have developed a sensor tube structure that can reliably prevent the leakage of compressed air, and in the present invention, "measurement of temperature and humidity in a compressed air pressure circuit". This leads to the proposal of "sensor tube structure for air".

Japanese Unexamined Patent Publication No. 2010-84736

In view of the above problems, the present invention relates to a sensor tube for measuring the temperature and humidity in compressed air in a compressed air pressure circuit, and is a sensor tube capable of preventing leakage of compressed air from a place where a temperature / humidity sensor or a closing cap is attached. The challenge is to provide the structure.

In order to solve the above problems, the present invention has a structure of a sensor tube arranged at a predetermined intermediate point of a piping line for measuring temperature and humidity in compressed air in a compressed pneumatic circuit. , A hollow tubular main pipe having a required length and diameter width in which a flow path for compressed air is formed inside, and a required length in which a sensor chamber is formed inside by branching from a predetermined intermediate point of the main pipe. -The whole is formed in a T-shape by being composed of a hollow tubular branch pipe with a diameter width, and both ends of the main pipe are equipped with a joint structure that can be connected to the piping line and the branch pipe. A closing cap is detachably attached to the end of the pipe by screwing, a penetrating sensor mounting hole is formed in the closing cap, and a temperature / humidity sensor is detachably inserted into the sensor mounting hole. A flange portion that can determine the position of the insertion length is provided at a predetermined position on the outer peripheral surface of the temperature / humidity sensor .

Further, the present invention employs a means in which a sealing agent is applied to a screwed portion between the branch pipe and the closing cap.

Further, the present invention employs a means in which a sealing agent is applied to a screwed portion between the sensor mounting hole and the temperature / humidity sensor.

According to the sensor tube structure for measuring temperature and humidity in the compressed air pressure circuit according to the present invention, the structure of the sensor tube connected to the piping line for measuring the temperature and humidity of the compressed air in the compressed air pressure circuit includes a branch pipe. By adopting a structure in which the blockage cap is attached by screwing and the sensor mounting hole and the temperature / humidity sensor are inserted by screwing, compressed air leaks from the place where the temperature / humidity sensor or blockage cap is attached. This has the excellent effect of being able to accurately measure the temperature and humidity of compressed air, and to accurately determine whether or not drainage can occur. Play.

It is a schematic explanatory drawing which shows the whole structure of the compressed pneumatic circuit in which this invention is adopted. It is explanatory drawing which shows the embodiment of the sensor tube structure for temperature and humidity measurement in the compressed pneumatic circuit which concerns on this invention. It is a table which shows the saturated water vapor amount under atmospheric pressure. It is a comparison / conversion table of the dew point temperature under atmospheric pressure and pressurization.

The sensor tube structure for measuring temperature and humidity in the compressed air pressure circuit according to the present invention is a branch pipe 24 as a structure of a sensor tube 20 connected to the piping line 2 for measuring the temperature and humidity of compressed air in the compressed air pressure circuit. The biggest feature is that the closing cap 26 is attached by screwing, and the sensor mounting hole 27 and the temperature / humidity sensor 28 are inserted by screwing.
Hereinafter, embodiments of a sensor tube structure for measuring temperature and humidity in the compressed pneumatic circuit according to the present invention will be described with reference to the drawings.

The sensor tube structure for measuring temperature and humidity in the compressed pneumatic circuit according to the present invention is not particularly limited to the embodiments described below, and is within the scope of the technical idea of the present invention, that is, the same operation and effect. It can be changed as appropriate within the range of the shape, dimensions, material, etc. that can be exhibited.

1 and 2 are explanatory views showing an embodiment of a sensor tube structure for measuring temperature and humidity in the compressed pneumatic circuit according to the present invention, and FIG. 1 shows an overall configuration of the compressed pneumatic circuit in which the present invention is adopted. A schematic explanatory view and FIG. 2 are explanatory views of a sensor tube structure according to the present invention.
The sensor tube structure for measuring temperature and humidity in the compressed air pressure circuit according to the present invention is from the time when the compressed air is generated by the air compressor 1 until the compressed air is finally discharged from the discharge port 3 through the piping line 2 and various devices. In the compressed air pressure circuit of the above, there is a structure of a sensor tube 20 provided with a temperature / humidity sensor 28 for measuring the temperature and humidity of compressed air under pressure.

First, a compressed pneumatic circuit in which the sensor tube 20 according to the present invention is arranged will be described.
The compressed pneumatic circuit is mainly composed of an air compressor 1 and a piping line 2. At the end of the piping line 2, a discharge port 3 for finally discharging compressed air is provided. A plurality of various devices are arranged at predetermined intermediate points from the air compressor 1 to the discharge port 3 in the piping line 2, if necessary.

The air compressor 1 is a machine that compresses air to generate compressed air above a predetermined atmospheric pressure, and there are various methods such as a reciprocating type, a rotary type, and a centrifugal type depending on the structure for generating the compressed air. do. The method of the air compressor 1 used in the present invention is not particularly limited, and any method and structure can be used. A piping line 2 for supplying the generated compressed air is connected to the air compressor 1.

The piping line 2 is composed of a hollow pipe for supplying compressed air, and is arranged to supply compressed air from the air compressor 1 to the discharge port 3. Since one or a plurality of various devices are arranged at a predetermined intermediate portion of the piping line 2, specifically, they are arranged so as to send compressed air from the air compressor 1 to the various devices. , Arranged to send compressed air from various devices to the destination. The pipe line 2 is provided with a pressure gauge 30 as needed, and can monitor the air pressure of the compressed air flowing in the pipe line 2.

The various devices arranged in the pipeline 2 are variously determined depending on the use of the compressed air, and are not particularly limited, but as devices regularly arranged, for example, the compressed air is cooled. There are an aftercooler 4, an air tank 5 for storing compressed air, an air dryer 6 for drying compressed air, an air filter 7 for removing foreign substances (oil, sludge, etc.) in the compressed air, and more. A centrifuge or the like for removing the drain in the compressed air is also provided accordingly. For the sake of explanation, the discharge port 3 may be included in various devices.

The aftercooler 4 is a device for heat exchange for cooling the high-temperature compressed air generated by the air compressor 1, and there are an air-cooled type and a water-cooled type depending on the cooling method. The aftercooler 4 used in the present invention does not ask whether it is an air-cooled type or a water-cooled type, and is not particularly limited.

The air tank 5 is a storage for temporarily storing compressed air, and is for leveling the pulsation of compressed air and suppressing a sudden pressure drop when a large amount of compressed air is temporarily consumed. It is prepared.

The air dryer 6 is a device for drying compressed air to remove water, and there are a freezing type, a hollow fiber membrane type, an adsorption type, and the like depending on the water removing method. The air dryer 6 used in the present invention is not limited to any of a freezing type, a hollow fiber membrane type, and an adsorption type, and is not particularly limited, but a freezing type air dryer is generally used. It is 6. The refrigerating air dryer 6 is a device for cooling compressed air by utilizing the latent heat of vaporization of the refrigerant to condense and remove the contained water, and can be introduced at a relatively low cost.

The air filter 7 is a filter for removing water, oil, sludge and microorganisms in compressed air, and is made of resin or paper and has a net-like or hollow fiber membrane-like air filter, or an air filter wrapped with activated carbon. Is used. The air filter 7 is generally arranged after the air dryer 6.

The centrifuge is a separator for removing moisture and oil in the compressed air, and the compressed air that has entered the housing is oil moisture and solids in the air due to the centrifugal force generated by passing through the deflector. Has a structure in which the air is struck against the inner wall of the housing and dropped, and only the air is taken out through the cartridge provided in the central portion. The centrifuge is disposed at a predetermined intermediate position in the piping line 2 connecting the air compressor 1 and the air dryer 6, or is arranged at a predetermined intermediate position in the piping line 2 connecting the air dryer 6 and the air filter 7. Will be done.

A drain trap 10 for discharging the generated drain as needed is connected to the air compressor 1 and various devices. The drain trap 10 includes an electromagnetic type and a float type depending on the discharge method thereof. The drain trap 10 used in the present invention does not ask whether it is an electromagnetic type or a float type, and is not particularly limited, but a spring snap action type or a magnetic snap action type float type drain trap is adopted. As a result, when a predetermined amount of drain is stored, the drain can be mechanically and automatically discharged to the outside, and the certainty of drain discharge is guaranteed.

In the piping line 2 arranged between various devices, a sensor tube 20 is arranged at a predetermined intermediate position thereof. The sensor tube 20 is branched from a hollow cylindrical main tube 21 having a required length and diameter width in which a flow path 22 capable of supplying compressed air is formed, and a predetermined intermediate portion of the main tube 21. The sensor chamber 25 is formed inside the hollow tubular branch pipe 24 having the required length and diameter, and by having such a configuration, the overall shape is formed into a substantially T shape as shown in the figure. Will be done. The material of the sensor tube 20 is preferably the same as that of the connected piping path 2, but is not particularly limited.

The sensor tube 20 is formed in a substantially T-shape by the main tube 21 and the branch tube 24, so that the branch tube 24 bulges outward with respect to the main tube 21 and expands thereof. The sensor chamber 25 will be formed at the exit location. That is, the branch pipe 24 functions as a space (sensor chamber 25) for deploying the temperature / humidity sensor 28. By adopting such an embodiment, it is possible to contribute to a smooth flow without giving stress to the flow of compressed air. That is, it can be assumed that the temperature / humidity sensor 28 provided in the sensor tube 20 acts as a resistance and exerts not a little stress on the compressed air passing through the flow path 22, but the space created by the branch tube 24 (sensor chamber). 25) is formed, and the temperature / humidity sensor 28 is provided in the space (sensor chamber 25) so that the flow of compressed air is not obstructed and accurate temperature and humidity can be measured under pressure. It will be possible.

Both ends of the main pipe 21 in the sensor pipe 20 are provided with a joint structure 23 that can be connected to the pipe line 2. The specific aspect of the joint structure 23 is not particularly limited as long as it can be connected to the piping line 2, but for example, as shown in the figure, a screwed joint structure 23 can be considered. That is, by forming a male screw on either one of the pipe passage 2 and the main pipe 21 and forming a female screw on the other, the two are screwed and connected. By adopting the joint structure 23 by such screwing, it is possible to prevent compressed air from leaking from the connection point between the piping line 2 and the sensor tube 20. In order to surely prevent the leakage of compressed air, it is preferable to apply a sealing agent to the portion of the joint structure 23.

A blocking cap 26 is detachably attached to the end of the branch pipe 24 in the sensor pipe 20 by screwing. As for the structure for mounting the block cap 26 on the branch pipe 24, a mounting structure by screwing is adopted. That is, a female screw is formed at the end of the branch pipe 24, a male screw is formed on the closing cap 26, and the male screw of the closing cap 26 is screwed into the female screw of the branch pipe 24, whereby the branch pipe 24 is formed. It is an embodiment in which the obstruction cap 26 is attached to the. By adopting the mounting structure by such screwing, it is possible to prevent compressed air from leaking from the screwed portion between the branch pipe 24 and the closing cap 26. In order to surely prevent the leakage of compressed air, it is preferable to apply a sealing agent to the screwed portion between the branch pipe 24 and the closing cap 26.

A penetrating sensor mounting hole 27 is formed in the closing cap 26, and a temperature / humidity sensor 28 is inserted into the sensor mounting hole 27 and is detachably mounted by screwing. As for the structure for inserting and mounting the temperature / humidity sensor 28 into the sensor mounting hole 27, a mounting structure by screwing is adopted. That is, a female screw is formed in the sensor mounting hole 27, and a male screw is formed at a predetermined position on the outer peripheral surface of the temperature / humidity sensor 28. The sensor mounting hole 27 is inserted into the sensor mounting hole 27 while the temperature / humidity sensor 28 is inserted into the sensor mounting hole 27. By screwing the female screw of the above and the male screw of the temperature / humidity sensor 28, both are fixed. By adopting the mounting structure by such screwing, it is possible to prevent compressed air from leaking from the screwed portion between the sensor mounting hole 27 and the temperature / humidity sensor 28. It should be noted that a flange portion 28c capable of determining the position of the insertion length is provided at a predetermined position on the outer peripheral surface of the temperature / humidity sensor 28 in addition to forming a male screw. Further, in order to surely prevent the leakage of compressed air, a sealing agent may be applied to the screwed portion between the sensor mounting hole 27 and the temperature / humidity sensor 28 and the contact surface with the closing cap 26 in the flange portion 28c. Suitable.

The temperature / humidity sensor 28 is for measuring the temperature and humidity of the compressed air flowing into the sensor tube 20 from the piping line 2, and has a sensor unit 28a at the tip for measuring the temperature and humidity. By inserting the temperature / humidity sensor 28 into the sensor mounting hole 27 of the block cap 26, the sensor portion 28a exists in the sensor chamber 25 formed in the branch pipe 24. Further, the base end of the temperature / humidity sensor 28 is provided with a sensor cord connecting portion 28b to which the sensor cord 29 is connected, and the sensor cord connecting portion 28b projects outward from the sensor mounting hole 27 in the blocking cap 26. If compressed air leaks from the sensor cord connecting portion 28b, an adhesive is applied to the sensor cord connecting portion 28b to seal the sensor cord connecting portion 28b and prevent the compressed air from leaking. As described above, the male screw and the flange portion 28c are formed on the outer peripheral surface of the temperature / humidity sensor 28.

The sensor code 29 connected to the sensor code connection unit 28b of the temperature / humidity sensor 28 transmits the measured values of temperature and humidity measured by the sensor unit 28a to the display unit 40. That is, the measured values of temperature and humidity measured by the sensor unit 28a are sent to the external display unit 40 via the sensor code 29, and are digitally displayed on the display unit 40. It is desirable that the display unit 40 has not only a function of digitally displaying the measured values of temperature and humidity but also a function of displaying the date and time. By displaying the date and time together with the measured values of temperature and humidity, the measured date and time and the measured value can be visually confirmed at the same time, and the recording and management of the measured results become easy.
Further, the display unit 40 is used by raising it to a height position where it is easy to see, such as by placing it on a desk having a leg portion 42 having a required height so that the measured value can be easily visually recognized.

It should be noted that one or more sensor tubes 20 may be arranged in one compressed pneumatic circuit. FIG. 1 shows a case where four sensor tubes 20 are arranged in one compressed pneumatic circuit. That is, the number of piping paths 2 existing between the devices is also determined by the number of various devices installed in the compressed air pressure circuit, and the sensor tube 20 can be arranged between the devices and compressed. Since it can be arranged without giving stress to the air flow, even if a plurality of sensor tubes 20 are arranged, there is almost no influence on the entire compressed air pressure circuit.

The basic flow of compressed air in the compressed air pressure circuit is as follows. That is, the compressed air generated by the air compressor 1 is first sent to various devices such as the aftercooler 4, the air tank 5, the air dryer 6, the air filter 7, and the centrifuge through the piping line 2. After that, the compressed air is finally sent from various devices to the discharge port 3 via the piping line 2 and used for various purposes.

In the middle of the flow of the compressed air, the temperature and humidity under the pressure of the compressed air are measured. That is, the compressed air passing through the pipe line 2 flows into the sensor pipe 20 arranged in the pipe line 2. Then, when passing through the sensor tube 20, the temperature and humidity are measured by the temperature / humidity sensor 28, and then the temperature and humidity are measured, and then the temperature and humidity flow out to the piping line 2.

As described above, according to the sensor tube structure for measuring temperature and humidity in the compressed air pressure circuit according to the present invention, the sensor tube 20 connected to the piping line 2 for measuring the temperature and humidity of the compressed air in the compressed air pressure circuit. As the structure of, the branch pipe 24 and the closing cap 26 are attached by screwing, and the sensor mounting hole 27 and the temperature / humidity sensor 28 are inserted by screwing, whereby the temperature / humidity sensor 28 is adopted. It is possible to prevent the leakage of compressed air from the mounting location of the block cap 26, so that the temperature and humidity of the compressed air can be measured accurately, and whether or not drainage can occur. It exerts excellent effects such as being able to accurately discriminate.

INDUSTRIAL APPLICABILITY The present invention can be applied to a compressed pneumatic circuit used in all fields where compressed air is used, as well as terminals for food processing, finishing processing of precision equipment such as lenses, cleaning, and the like. Therefore, it is considered that the industrial applicability of the "sensor tube structure for measuring temperature and humidity in a compressed pneumatic circuit" according to the present invention is great.

1 Air compressor 2 Piping line 3 Discharge port 4 Aftercooler 5 Air tank 6 Air dryer 7 Air filter 10 Drain trap 20 Sensor tube 21 Main tube 22 Flow path 23 Joint structure 24 Branch tube 25 Sensor room 26 Blocking cap 27 Sensor mounting hole 28 Temperature Wetness sensor 28a Sensor part 28b Sensor code connection part 29 Sensor code 30 Pressure gauge 40 Display part 42 Leg part

Claims (3)

It is a structure of a sensor tube arranged at a predetermined intermediate point of a piping line for measuring the temperature and humidity in compressed air in a compressed air pressure circuit.
The sensor tube has a hollow tubular main tube having a required length and diameter with a flow path of compressed air formed inside, and a sensor chamber is formed inside by branching from a predetermined intermediate point of the main tube. By being composed of a hollow tubular branch pipe having the required length and diameter, the whole is formed into a substantially T shape.
Both ends of the main pipe are equipped with a joint structure that can be connected to the piping line, and a block cap is detachably attached to the end of the branch pipe by screwing.
A sensor mounting hole is formed through the block cap, and a temperature / humidity sensor is detachably inserted into the sensor mounting hole by screwing .
A sensor tube structure for measuring temperature and humidity in a compressed pneumatic circuit, characterized in that a flange portion capable of determining the position of the insertion length is provided at a predetermined position on the outer peripheral surface of the temperature / humidity sensor.
The sensor tube structure for measuring temperature and humidity in the compressed pneumatic circuit according to claim 1, wherein a sealing agent is applied to a screwed portion between the branch tube and the closing cap. The sensor tube structure for measuring temperature and humidity in the compressed pneumatic circuit according to claim 1 or 2, wherein a sealing agent is applied to a screwed portion between the sensor mounting hole and the temperature / humidity sensor.

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