JP2010104873A - Oxygen-enriched air introducing apparatus - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an oxygen-enriched air introducing apparatus which is adjustable of the flow rate of oxygen-enriched air. <P>SOLUTION: In the oxygen-enriched air introducing apparatus, negative pressure generated by the water flow of a water flow pipe 6 is applied to an oxygen enriching means 2 from an introducing pipe 1, and the oxygen-enriched air produced in the oxygen enriching means 2 is introduced to the water flow pipe 6 from the introducing pipe 1. Wherein, the plurality of the oxygen enriching means 2 are provided, and the introducing pipe 1 comprises a collective pipe 11 communicated with the water flow pipe 6 and branched pipes 12a, 12b branched from the collective pipe 11 and communicated with the respective oxygen enriching means 2. The respective branched pipes 12a, 12b are provided with flow control valves 24a, 24b controlling the flow of the oxygen-enriched air from the oxygen enriching means 2a, 2b, and also provided with at least any one of a sensor 4 detecting the pressure in the collective pipe 11 of the introducing pipe 1 or the flow rate of the oxygen-enriched air, and a sensor 5 detecting the temperature of oxygen enriching membranes 21a, 21b of the oxygen enriching means 2a, 2b or atmospheric temperature in the vicinity thereof. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to an oxygen-enriched air introduction device.

  Conventionally, oxygen-enriched air generated by an oxygen-enriching device is introduced into a pipe that circulates bathtub water in the bathtub with a pump, oxygen-enriched air is mixed into the bathtub water, and oxygen is discharged into the bathtub again. An enriched hot water supply apparatus is known (see, for example, Patent Document 1).

In this oxygen-enriched hot water supply apparatus, a throttle portion is provided in a pipe, and oxygen-enriched air generated by the oxygen enricher is introduced into the pipe by a negative pressure generated in the throttle. In the oxygen enrichment apparatus, an oxygen enriched film is used, and oxygen is selectively permeated through the oxygen enriched film to generate oxygen enriched air. Due to the characteristics of the oxygen-enriched membrane, the permeation flow rate varies depending on the environmental temperature. Therefore, in the oxygen-enriched hot water supply apparatus, the flow rate of oxygen-enriched air introduced into the pipe line varies, and this variation is the pump of the pipe line. When the gas-liquid mixing ratio in the interior is changed and the gas ratio is high, there is a possibility that a problem such as air lock of the pump may occur. Therefore, in order to secure a desired gas flow rate, a vacuum pump is provided, the vacuum pressure by the vacuum pump is applied to the oxygen-enriched membrane, and oxygen-enriched air is excessively sucked, and all or part of it is placed in the pipe line. It is possible to introduce. That is, it is conceivable that the flow rate is set so that a desired flow rate is obtained even under the assumed worst temperature condition (low temperature condition), and excess air is discharged to others when there is too much air under high temperature conditions. However, there is a problem that the cost becomes high, for example, a vacuum pump and another path are required.
JP 2004-350932 A

  The present invention has been made in view of the circumstances as described above, and an object thereof is to provide an oxygen-enriched air introducing device capable of adjusting the flow rate of oxygen-enriched air.

  The present invention is characterized by the following in order to solve the above problems.

  First, an oxygen-enriching means that has an oxygen-enriched membrane and generates oxygen-enriched air, and an introduction pipe that introduces oxygen-enriched air generated by the oxygen-enriched means into the water pipe are provided. In an oxygen-enriched air introduction device that introduces oxygen-enriched air generated by the oxygen-enriching means from the introduction pipe to the water pipe by causing negative pressure generated in the water flow of the water pipe to act on the oxygen-enriching means from the introduction pipe. A plurality of enrichment means are provided, and the introduction pipe is composed of a collective pipe communicating with the water pipe and a branch pipe branched from the collective pipe and communicated with each oxygen enrichment means. A flow rate adjustment valve for adjusting the flow rate of the oxygen-enriched air from the oxygenation means, a sensor for detecting the pressure in the collecting pipe of the introduction pipe or the flow rate of the oxygen-enriched air, and the oxygen enrichment of the oxygen enrichment means Detect the temperature of the chemical film or the ambient temperature near it At least one of the sensors is provided and depends on the pressure in the collecting pipe of the introduction pipe detected by the sensor, the flow rate of the oxygen-enriched air, the temperature of the oxygen-enriched film, or the ambient temperature in the vicinity thereof. The flow control valve of the branch pipe is opened and closed to adjust the flow rate of the oxygen-enriched air introduced from the introduction pipe to the water pipe.

  Second, in the first invention, when the pressure in the collecting pipe of the introduction pipe detected by the sensor is high, the flow rate of the oxygen-enriched air is large, or the temperature of the oxygen-enriched film is high, a plurality of Oxygen-enriched air from the oxygen-enriching means by closing the flow-regulating valves of branch pipes communicating with some of the oxygen-enriching means among the flow-regulating valves provided in the branch pipes communicating with the provided oxygen-enriching means To suppress the flow rate.

  Third, in the first or second aspect of the present invention, a flow rate adjusting means for adjusting the flow rate of the water pipe that varies the negative pressure generated in the water flow of the water pipe is further provided, and the introduction detected by the sensor Negative pressure generated in the water flow of the water pipe by adjusting the flow rate of the water pipe with the flow rate adjusting means according to the pressure in the pipe or the flow rate of oxygen-enriched air or the temperature of the oxygen-enriched membrane or the ambient temperature in the vicinity To adjust the flow rate of oxygen-enriched air introduced from the introduction pipe to the water pipe.

  According to the first aspect of the invention, the flow regulating valve of the branch pipe is opened and closed according to the pressure in the introduction pipe or the flow rate of oxygen-enriched air, the temperature of the oxygen-enriched film or the ambient temperature in the vicinity thereof, and the flow from the introduction pipe. The flow rate of the oxygen-enriched air introduced into the water pipe can be adjusted within a preset range so as not to fluctuate greatly. Therefore, variation in the flow rate of the oxygen-enriched air due to fluctuations in the environmental temperature is suppressed, and the oxygen-enriched air can be introduced into the water pipe at a stable flow rate. In addition, it is possible to suppress the variation in the flow rate of oxygen-enriched air without installing a vacuum pump and a separate path for discharging excess air. Is no longer necessary, and the device can be miniaturized.

  According to the second invention, the flow rate of oxygen-enriched air from the oxygen-enriching means can be easily suppressed by opening some of the plurality of flow rate control valves.

  According to the third invention, the flow rate of oxygen-enriched air introduced from the introduction pipe to the water pipe can be adjusted by adjusting the negative pressure generated in the water flow of the water pipe by the flow rate adjusting means. Flow control is possible. Moreover, since the number of oxygen-enriched films can be reduced, further cost reduction can be expected.

  The present invention has the features as described above. The best mode for carrying out the present invention will be described below.

  FIG. 1 is a schematic configuration diagram of an oxygen-enriched air introducing device for bathtubs according to an embodiment of the present invention. FIG. 2 is a cross-sectional view of the oxygen enrichment means 2 of FIG.

  A suction port 8 and a discharge port 9 are provided on the side wall of the bathtub 20, and the bathtub water W in the bathtub 20 is sucked into the suction port 8, and oxygen-enriched air is dissolved in the bathtub water W at the discharge port 9. The dissolved gas dissolved water is discharged.

  The suction port 8 and the discharge port 9 are communicated with a water pipe 6 for circulating bath water disposed outside the bathtub 20, and a liquid feed pump 31 constituting the flow rate adjusting means 3 is provided in the middle of the water pipe 6. The bath water W in the bathtub 20 is sucked from the suction port 8 by driving the liquid feed pump 31 and discharged from the discharge port 9 into the bathtub 20 through the water pipe 6.

  A gas introduction part 10 is provided in the water flow pipe 6 on the upstream side of the liquid feed pump 31, and the introduction pipe 1 is connected to the gas introduction part 10. Furthermore, an oxygen enrichment means 2 is disposed upstream of the introduction pipe 1, and oxygen-enriched air produced by the oxygen enrichment means 2 passes through the introduction pipe 1 from the gas introduction section 10. The water pipe 6 is introduced.

  The gas introduction part 10 of the water flow pipe 6 has an ejector structure, and a negative pressure is generated when the water flow generated by driving the liquid feed pump 31 passes, and this negative pressure is supplied from the introduction pipe 1 to the oxygen of the oxygen enrichment means 2. By acting on the enrichment membranes 21a and 21b, the oxygen-enriched air generated by the oxygen enrichment means 2 is introduced from the introduction pipe 1 into the water pipe 6. The negative pressure generated in the gas introduction unit 10 varies depending on the strength of the water flow in the water pipe 6, and the stronger the water flow, the more negative pressure is generated.

  A plurality of oxygen enriching means 2 are provided. As shown in FIGS. 1 and 2, in this embodiment, two oxygen enriching means 2a and 2b are provided. Each of the oxygen enriching means 2a and 2b is composed of oxygen enriched films 21a and 21b that separate nitrogen and oxygen and selectively permeate oxygen, and as shown in FIG. 2, the oxygen enriched film 21a. , 21b are arranged to face each other. By applying a negative pressure lower than the atmospheric pressure to the inner surfaces of the oxygen-enriched films 21a and 21b (downstream of the oxygen-enriched films 21a and 21b), that is, the side through which oxygen permeates, the oxygen-enriched films 21a and 21b. Oxygen is selectively taken in from the air on the outer surface side (upstream side of the oxygen-enriched films 21a and 21b), and air having a relatively high oxygen concentration (oxygen-enriched air) is generated. . As shown in FIG. 2, paths 25a and 25b are independently formed on the inner surfaces of the oxygen-enriched films 21a and 21b. The path 25a is connected to the branch pipe 12a of the introduction pipe 1 and the path 25b is introduced. The oxygen-enriched air that is connected to the branch pipe 12b of the pipe 1 and permeates through the oxygen-enriched films 21a and 21b is introduced into the introduction pipe 1 via the paths 25a and 25b, respectively. Further, packings 40a and 40b that separate the path 25a and the path 25b are provided, and are sealed so that oxygen-enriched air flowing through the path 25a and the path 25b does not leak to the outside. In the vicinity of the oxygen-enriched films 21a and 21b, air enriched with nitrogen that is difficult to permeate stays. For this reason, in this embodiment, the ventilation fan 22 (not shown in FIG. 2) for ventilating the surfaces of the oxygen-enriched films 21a and 21b is provided.

  The oxygen-enriched films 21a and 21b generally have the following characteristics. That is, when the negative pressure applied to the oxygen-enriched films 21a and 21b is constant, the permeate flow rate increases as the temperature of the oxygen-enriched films 21a and 21b increases, and after the oxygen-enriched films 21a and 21b have permeated. The oxygen concentration in the air decreases. Conversely, if the temperature is lowered, the permeation flow rate is lowered, and the oxygen concentration of the air after permeating the oxygen-enriched films 21a and 21b is increased. The supply amount of oxygen-enriched air determined by the product of the oxygen concentration of the air after permeation of the oxygen-enriched membranes 21a and 21b and the permeation flow rate generally tends to increase as the temperature increases. Further, when a more negative pressure is applied to the oxygen-enriched membranes 21a and 21b, the permeate flow rate increases, the oxygen concentration of the air after permeating the oxygen-enriched membranes 21a and 21b increases, and the supply of oxygen-enriched air The amount generally tends to increase. Accordingly, even if the temperature of the oxygen-enriched films 21a and 21b varies, the supply amount of oxygen-enriched air can be adjusted by changing the negative pressure applied to the oxygen-enriched films 21a and 21b.

  The introduction pipe 1 includes a collecting pipe 11 that communicates with the water pipe 6 and branch pipes 12 a and 12 b that branch from the collecting pipe 11. Each of the branch pipes 12a and 12b is connected in parallel to each of a plurality of oxygen enriching means 2a and 2b. The branch pipes 12a and 12b are provided with flow rate adjusting valves 24a and 24b for adjusting the flow rate of oxygen-enriched air from the oxygen-enriching means 2a and 2b. These flow rate adjusting valves 24a and 24b are electromagnetic valves capable of adjusting the throttle opening, and the throttle is subjected to pressure loss, so that the negative pressure acting on the oxygen-enriched films 21a and 21b is reduced and the flow rate of oxygen-enriched air is reduced. . The throttle openings of the flow rate adjusting valves 24a and 24b are adjusted by the control unit 30 that is electrically connected to the flow rate adjusting valves 24a and 24b.

  Furthermore, in this embodiment, as shown in FIG. 1, the sensor 4 for detecting the pressure in the collective pipe 11 of the introduction pipe 1 and the flow rate of oxygen-enriched air, and the oxygen-enriched film 21a of the oxygen-enriching means 2a, 2b. , 21b and the ambient temperature in the vicinity thereof are provided. These sensors 4 and 5 are connected to the control unit 30, and the pressure in the introduction pipe 1 detected by the sensors 4 and 5, the flow rate of the oxygen-enriched air, the temperature of the oxygen-enriched films 21a and 21b, and the vicinity thereof. The flow rate of oxygen-enriched air from the oxygen-enriching means 2a, 2b can be adjusted by adjusting the opening of the flow rate adjusting valves 24a, 24b based on information such as the ambient temperature. This will be specifically described below.

  In this embodiment, a diaphragm type pressure sensor 41 is provided in the introduction pipe as the sensor 4 for detecting the pressure in the collective pipe 11 of the introduction pipe 1 and the flow rate of the oxygen-enriched air. The pressure sensor 41 detects the pressure in the collective pipe 11 of the introduction pipe 1. If the inner diameter of the collective pipe 11 is known, the flow rate of oxygen-enriched air in the collective pipe 11 can be easily calculated. . Therefore, when adjusting the supply amount of oxygen-enriched air within a predetermined range, if the flow rate of oxygen-enriched air calculated based on the pressure detected by the pressure sensor 41 is larger than the predetermined range, for example, oxygen-enriched air The flow rate adjusting valve 24a of the branch pipe 12a communicating with the gasifying means 2a is closed, and the flow rate adjusting valve 24b of the branch pipe 12b communicating with the other oxygen enriching means 2b is maintained open. As a result, the negative pressure acting on the oxygen-enriched film 21a of the oxygen-enriching means 2a is cut off, so that oxygen-enriched air is not supplied to the collecting pipe 11, and oxygen-enriched air is supplied only from the oxygen-enriching means 2b. As a result, the flow rate of oxygen-enriched air from the oxygen-enriching means 2 to the introduction pipe 1 is suppressed as a whole. Since the oxygen enriching means 2a and 2b are arranged in parallel to the introduction pipe 1, the pressure loss caused by closing the flow rate regulating valve 24a affects the negative pressure acting on the oxygen enriched film 21b, thereby reducing the oxygen concentration. There is no reduction. In order to suppress the flow rate of oxygen-enriched air from the oxygen-enriching means 2 to the introduction pipe 1, the flow control valves 24a and 24b of the branch pipes 12a and 12b communicating with the oxygen-enriching means 2a and 2b are opened. You may make it adjust a degree suitably. Instead of the pressure sensor 41, a sensor that detects the flow rate of oxygen-enriched air may be provided.

  As the sensor 5 for detecting the temperature of the oxygen-enriched films 21a and 21b of the oxygen-enriching means 2a and 2b and the ambient temperature in the vicinity thereof, the thermistor is provided inside the case 23 housing the oxygen-enriched films 21a and 21b and the ventilation fan 22. 51 (not shown in FIG. 2) is installed to constantly detect the ambient temperature in the vicinity of the oxygen-enriched films 21a and 21b. When detecting the temperature of the oxygen-enriched films 21a and 21b, for example, the thermistor 51 is provided in contact with the oxygen-enriched films 21a and 21b. If the temperature of the oxygen-enriched membranes 21a and 21b varies, the supply amount of oxygen-enriched air also varies in accordance with the temperature. Therefore, in order to adjust the supply amount of oxygen-enriched air within a predetermined range, It is necessary to know in advance the temperature range of the oxygen-enriched films 21a and 21b that deviate from the predetermined range. When the temperature of the oxygen-enriched films 21a and 21b is within a temperature range that deviates from a predetermined range that has been grasped in advance, that is, when the supply amount of oxygen-enriched air deviates from the predetermined range, The flow rate of the oxygen-enriched air from the oxygen-enriching means 2a, 2b is adjusted by adjusting the opening degree of the regulating valves 24a, 24b. For example, when the temperature of the oxygen-enriched films 21a and 21b detected by the thermistor 51 is high and the supply amount of oxygen-enriched air exceeds a predetermined range, the flow control valve 24a of the branch pipe 12a communicating with the oxygen-enriching means 2a. Is closed, and the flow regulating valve 24b of the branch pipe 12b communicating with the other oxygen enriching means 2b is kept open. As a result, the negative pressure acting on the oxygen-enriched film 21a of the oxygen-enriching means 2a is cut off, so that oxygen-enriched air is not supplied to the collecting pipe 11, and oxygen-enriched air is supplied only from the oxygen-enriching means 2b. As a result, the flow rate of oxygen-enriched air from the oxygen-enriching means 2 to the introduction pipe 1 is suppressed as a whole. Since the oxygen enriching means 2a and 2b are arranged in parallel to the introduction pipe 1, the pressure loss caused by closing the flow rate regulating valve 24a affects the negative pressure acting on the oxygen enriched film 21b, thereby reducing the oxygen concentration. There is no reduction. In order to suppress the flow rate of oxygen-enriched air from the oxygen-enriching means 2 to the introduction pipe 1, the flow control valves 24a and 24b of the branch pipes 12a and 12b communicating with the oxygen-enriching means 2a and 2b are opened. You may make it adjust a degree suitably.

  Although the example which provided both the pressure sensor 41 and the thermistor 51 was demonstrated in FIG. 1, the sensor 4 and the oxygen enrichment means 2a, 2b which detect the pressure in the collection pipe | tube 11 of the introduction piping 1, and the flow volume of oxygen-enriched air are demonstrated. At least one of the sensors 5 for detecting the temperature of the oxygen-enriched films 21a and 21b and the ambient temperature in the vicinity thereof may be provided.

  Further, in the present embodiment, information on the pressure in the collecting pipe 11 of the introduction pipe 1 detected by the sensors 4 and 5, the flow rate of oxygen-enriched air, the temperature of the oxygen-enriched films 21 a and 21 b, the ambient temperature in the vicinity thereof, and the like. In addition to adjusting the opening degree of the flow rate adjusting valves 24a and 24b based on this, the output voltage (pump capacity) of the liquid feed pump 31 is changed to adjust the flow rate of the bathtub water W flowing through the water pipe 6. May be. When the flow rate of the bathtub water W flowing in the water pipe 6 is changed, the strength of the water flow is changed, and the negative pressure generated in the gas introduction unit 10 is changed as described above. If the negative pressure changes, the flow rate of the oxygen-enriched air changes due to the characteristics of the oxygen-enriched membranes 21a and 21b. Therefore, the oxygen-enriched air introduced into the water pipe 6 can be changed by changing the pumping capacity of the liquid feed pump 31. The flow rate can be adjusted within a preset range. The pumping capacity of the liquid feed pump 31 is changed by the control unit 30 that is electrically connected to the liquid feed pump 31.

Next, how the flow rate of the oxygen-enriched air specifically changes by changing the pumping capacity of the liquid feed pump 31 will be described with reference to FIG. FIG. 3 is a diagram showing the flow rate-negative pressure characteristics of oxygen-enriched air, where (a) shows a case where the pumping capacity of the liquid feed pump is constant, and (b) shows this embodiment. The case where the pumping capacity of the feed pump is variable is shown. The vertical axis represents the flow rate of oxygen-enriched air, and the horizontal axis represents negative pressure. The negative pressure shown on the horizontal axis is a larger negative pressure as it goes to the right side of the graph. The PQ characteristics of the oxygen-enriched film vary with changes in the material lot of the film and the environmental temperature, and the straight lines A and B indicate the upper and lower limits of the variation in the PQ characteristics of the oxygen-enriched film, respectively. ing. The flow rate of the oxygen-enriched air is determined by a balance point between the PQ characteristic of the oxygen-enriched film and the PQ characteristic of the liquid feed pump. For example, in (a), the negative pressure that can be read from the horizontal axis at the point a where the straight line C indicating the PQ characteristic of the liquid feed pump intersects the straight line A indicating the PQ characteristic of the oxygen-enriched film is the oxygen-enriched film. Q _U1 so that the flow rate of the oxygen-enriched air at that time can be read from the vertical axis. Similarly, a negative pressure that can be read from the horizontal axis at point b where the straight line C indicating the PQ characteristic of the liquid feed pump and the straight line B indicating the PQ characteristic of the oxygen-enriched film intersect acts on the oxygen-enriched film. The pressure is Q _L1 so that the flow rate of the oxygen-enriched air at that time can be read from the vertical axis. Therefore, the change in the flow rate of the oxygen-enriched air when the variation in the PQ characteristic of the oxygen-enriched film is taken into consideration is in the range of Q _{L1 to} Q _U1 .

A straight line D and a straight line E in FIG. 3B indicate an upper limit value and a lower limit value of the PQ characteristics of the assumed liquid feed pump, respectively. The PQ characteristic when the pump capacity is changed by changing the output voltage of the liquid feed pump is determined by a straight line obtained by translating the straight line D or the straight line E between the upper limit value and the lower limit value. When the pumping capacity of the liquid feed pump is changed, the flow rate change can be made smaller than the range of Q _{L1 to} Q _U1 , which is the flow rate change of the oxygen-enriched air in (a). For example, at a point c where the straight line E indicating the PQ characteristic of the liquid feed pump and the straight line A indicating the PQ characteristic of the oxygen-enriched membrane intersect, the flow rate of the oxygen-enriched air becomes Q _U2 , At a point d where the straight line D indicating the PQ characteristic and the straight line B indicating the PQ characteristic of the oxygen-enriched film intersect, the flow rate of the oxygen-enriched air becomes _QL2 . That is, even when the variation in the PQ characteristics of the oxygen-enriched film is taken into account, the change in the flow rate of the oxygen-enriched air can be in the range of Q _{L2 to} Q _U2 that is smaller than the range of Q _{L1 to} Q _U1 .

  When oxygen-enriched air is introduced into the water pipe 6, the oxygen-enriched air is mixed into the bathtub water W flowing through the water pipe 6 to generate gas-liquid mixed water. Since the gas-liquid mixed water is introduced with oxygen-enriched air at a flow rate within a preset range, the gas ratio does not become so high that an air lock occurs in the liquid feed pump 31.

  A dissolution tank 7 is disposed in the water pipe 6 between the liquid feed pump 31 and the discharge port 9, and the gas-liquid mixed water is passed through a meandering path in the dissolution tank 7 or the gas-liquid mixed water is stirred. By doing so, the oxygen-enriched air is dissolved in the bath water W to generate gas-dissolved water.

  The dissolved gas generated in the dissolution tank 7 is discharged into the bathtub 20 from the discharge port 9.

  The oxygen-enriched air introduction device having the above configuration can introduce the oxygen-enriched air into the water pipe 6 at a stable flow rate while suppressing variations in the flow rate of the oxygen-enriched air due to changes in the environmental temperature. In addition, it is not necessary to install a vacuum pump and a separate path for exhausting excess air to reduce the variation in the flow rate of oxygen-enriched air, and it is not necessary to secure a space for installing the vacuum pump and another path. Therefore, it is possible to design the device as a small size.

  While the present invention has been described based on the embodiments, the present invention is not limited to the above-described embodiments, and various modifications can be made without departing from the scope of the invention. In the above embodiment, the case where there are two oxygen-enriching means has been described. Moreover, although the case where the oxygen-enriched air introducing device is applied to a bathtub has been described, it may be applied to a shower device or the like. In this case, for example, a water pipe may be connected to the water pipe, oxygen-enriched air may be introduced into the tap water from the water pipe, and the gas dissolved water may be discharged from the shower head through the dissolution tank.

It is a schematic block diagram of the oxygen enriched air introduction apparatus for bathtubs which is one Embodiment of this invention. It is sectional drawing of the oxygen enrichment means of FIG. It is a figure which shows the flow volume-negative pressure characteristic of oxygen-enriched air, (a) shows the case where the pump capacity of a liquid feed pump is constant, (b) shows the case where the pump capacity of a liquid feed pump varies.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Introduction piping 11 Collecting piping 12a, 12b Branch piping 2 Oxygen enrichment means 2a, 2b Oxygen enrichment means 21a, 21b Oxygen enrichment film | membrane 22 Ventilation fan 23 Case 24a, 24b Flow rate adjustment valve 3 Flow rate adjustment means 31 Liquid feed pump 4 , 5 Sensor 6 Water pipe W Bath water

Claims (3)

  Oxygen-enriching means that has an oxygen-enriched membrane and generates oxygen-enriched air, and an introduction pipe that introduces oxygen-enriched air generated by this oxygen-enriched means into the water pipe, and is generated by the water flow in the water pipe In the oxygen-enriched air introducing device that introduces oxygen-enriched air generated by the oxygen-enriching means from the introducing pipe to the water pipe by causing negative pressure to act on the oxygen-enriching means, the oxygen-enriching means includes a plurality of oxygen-enriching means. The introduction pipe is composed of a collection pipe communicating with the water pipe and a branch pipe branched from the collection pipe and communicated with each oxygen enrichment means, and each branch pipe has oxygen from the oxygen enrichment means. A flow rate adjusting valve for adjusting the flow rate of the enriched air is provided, a sensor for detecting the pressure in the collecting pipe of the introduction pipe or the flow rate of the oxygen enriched air, and the temperature of the oxygen enriched film of the oxygen enrichment means or A sensor that detects the ambient temperature in the vicinity. At least one of the sensors is provided, and the branch pipe according to the pressure in the collective pipe of the introduction pipe detected by the sensor, the flow rate of the oxygen-enriched air, the temperature of the oxygen-enriched film, or the ambient temperature in the vicinity thereof An oxygen-enriched air introduction device characterized by adjusting the flow rate of oxygen-enriched air introduced from the introduction pipe to the water pipe by opening and closing the flow rate adjustment valve.   Branch piping that communicates with multiple oxygen-enriching means provided when the pressure in the collective piping of the introduction piping detected by the sensor is high, when the flow rate of oxygen-enriched air is high, or when the temperature of the oxygen-enriched membrane is high The flow control valve of the branch pipe communicating with some of the oxygen enrichment means among the flow control valves provided in the valve is closed to suppress the flow rate of the oxygen-enriched air from the oxygen enrichment means. 2. The oxygen-enriched air introduction device according to 1.   A flow rate adjusting means for adjusting the flow rate of the water pipe, which varies the negative pressure generated by the water flow in the water pipe, is further provided, and the pressure in the introduction pipe detected by the sensor or the flow rate of oxygen-enriched air or oxygen enrichment is provided. Depending on the temperature of the membrane or the ambient temperature in the vicinity, the flow rate of the water pipe is adjusted by the flow rate adjusting means, thereby changing the negative pressure generated in the water flow of the water pipe and introducing oxygen rich into the water pipe from the introduction pipe The oxygen-enriched air introduction device according to claim 1 or 2, wherein the flow rate of the oxygenated air is adjusted.

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