JP2010017704A - Deaerator, and deaeration/gas injection apparatus - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a deaerator and a deaeration/gas injection apparatus generating a liquid with a high deaeration degree in a short period of time. <P>SOLUTION: The deaerator includes: a liquid storage tank; a pressure-feeding means for pressure-feeding the liquid in the tank in the downstream direction; a first pipe with one end communicated with the tank and the other end communicated with the suction part of the pressure-feeding means; a second pipe with one end communicated with the discharge part of the pressure-feeding means and the other part communicated with the tank; a cavity generating means provided in the second pipe and generating a cavity by super-cavitation; and a pressure reducing means reducing the pressure in the tank. The deaeration/gas injection apparatus is also provided. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a deaeration device that deaerates a predetermined liquid, and a deaeration / aeration device that injects gas by dissolving a required gas in the deaerated liquid.

  One of the inventors of the present invention previously invented a degassing device and a degassing / dissolving device using super cavitation.

  In the deaeration apparatus using super cavitation, a separation part is provided in the middle of the pipe to which the liquid to be deaerated is fed, and a cavity peculiar to super cavitation is generated in the separation part, and the inside of this cavity is extremely low. A gas dissolved in the liquid is deposited in the cavity by the pressure, and the deposited gas is degassed by suction and removal with a vacuum pump or the like. Here, in the peeling part, a peeling point is provided on the inner surface of the pipe so as to protrude inward, and the liquid is peeled off from the inner surface of the pipe, and a cavity is generated by this liquid peeling. (For example, refer to Patent Document 1).

  As described above, in the deaeration device, deaeration is performed by utilizing the fact that the cavity generated in the separation part by super cavitation is in a very low pressure state, but a predetermined gas is fed into the cavity. By setting the inside of the cavity to a high pressure state, the gas in the cavity can be dissolved in the liquid. By utilizing this, the degassing / dissolving apparatus effectively dissolves the required gas in the liquid (for example, see Patent Document 2). In the following, dissolving gas in a liquid is referred to as “gassing”.

Japanese Patent No. 3950979 International Publication No. 2007/094434 Pamphlet

  In the deaeration device and the deaeration / dissolution device (deaeration / aeration device) using the super cavitation phenomenon, the time required for the deaeration is long, and it is required to deaerate in a shorter time. There was a need to increase the degree of deaeration.

  The present inventors have conducted research and development to provide a degassing device and a degassing / gassing device capable of generating a liquid with a high degassing degree in a shorter time, and have achieved the present invention. .

  In the deaeration device of the present invention, the tank for storing the liquid, the pressure feeding means for pumping the liquid in the tank in the downstream direction, one end of the tank is connected to the suction section, and the other end is connected to the suction portion of the pressure feeding means. A first pipe, a second pipe having one end connected in communication with the discharge portion of the pumping means and the other end connected in communication with the tank; and a cavity generating means provided in the middle of the second pipe to generate a cavity by supercavitation And a decompression means for decompressing the inside of the tank.

  Further, in the deaeration device of the present invention, the decompression means includes an auxiliary tank for storing the liquid, an auxiliary pumping means for pumping the liquid in the auxiliary tank in the downstream direction, one end connected to the auxiliary tank, and the other end. A first auxiliary pipe that communicates with the suction part of the auxiliary pressure-feeding means, a second auxiliary pipe that communicates and connects one end to the discharge part of the auxiliary pressure-feeding means, and communicates the other end with the auxiliary tank, and the second auxiliary pipe. A decompression cavity generator that is provided in the middle of the cavity to generate a cavity by supercavitation, and a communication pipe that communicates and connects the cavity generated by the decompression cavity generator and the space above the liquid level in the tank It also has a feature.

  Moreover, the degassing apparatus of the present invention is also characterized in that a predetermined gas is fed into the cavity generated by the cavity generating means and the gas is dissolved in the liquid.

  In the deaeration / aeration apparatus of the present invention, the tank for storing the liquid, the pressure feeding means for pumping the liquid in the tank in the downstream direction, the one end connected to the tank in communication and the other end of the suction by the pressure feeding means A first pipe that is connected to the part, a second pipe that is connected to the discharge part of the pressure feeding means at one end and the other end is connected to the tank, and a cavity formed by super cavitation is provided in the middle of the second pipe. And a gas supply means for supplying a predetermined gas into the cavity, and after degassing the liquid while circulating the liquid through the first pipe and the second pipe, the gas A degassing / air injecting device that feeds gas into a cavity by a feeding means and dissolves it in a liquid, and is provided with a pressure reducing means for depressurizing the inside of the tank when the liquid is degassed.

  Further, the decompression means includes an auxiliary tank for storing the liquid, an auxiliary pressure feeding means for pumping the liquid in the auxiliary tank in the downstream direction, one end connected to the auxiliary tank, and the other end as a suction portion of the auxiliary pressure feeding means. A first auxiliary pipe connected in communication, a second auxiliary pipe connected at one end to the discharge portion of the auxiliary pumping means and connected at the other end to the auxiliary tank, and provided in the middle of the second auxiliary pipe by super cavitation It is also characterized by having a decompression cavity generator that generates a cavity, and a communication pipe that connects the cavity generated by the decompression cavity generator and the space above the liquid level in the tank. In addition, the second pipe is branched into a degassing distribution pipe and an inflowing distribution pipe on the downstream side of the cavity generating means, and the inflowing distribution pipe is connected to the tank on the bottom side of the tank from the degassing distribution pipe. Communication And, during degassing, the liquid is passed through the degassing during distribution piping, note the time care, but also has a feature in that it was circulated liquid Chuki during distribution piping.

  In the present invention, in a deaeration device and a deaeration / air injection device using a cavity generating means for generating a cavity by supercavitation, the gas deposited in the cavity is removed as in the conventional deaeration device. Instead, it is possible to effectively perform deaeration by reducing the pressure in the tank by the pressure reducing means, and to generate a liquid with a high degree of deaeration in a short time.

  In particular, an auxiliary tank for storing liquid, auxiliary pressure feeding means for circulating the liquid in the auxiliary tank, and a first auxiliary pipe having one end connected to the auxiliary tank and the other end connected to the suction portion of the auxiliary pressure feeding means. A second auxiliary pipe having one end connected in communication with the discharge portion of the auxiliary pumping means and the other end connected in communication with the auxiliary tank, and a pressure reducing cavity that is provided in the middle of the second auxiliary pipe to generate a cavity by super cavitation A suction device such as a vacuum pump is used by using a decompression means having a product and a communication pipe that communicates and connects a cavity generated by the decompression cavity generator and a space above the liquid level in the tank. There is no need, and cost can be reduced and maintenance can be improved.

  Furthermore, in the case of a degassing device, a predetermined gas is fed into the cavity generated by the cavity generating means, and the gas is dissolved in the liquid, so that the degassing degree of the gas other than the gas is dissolved. Can be further enhanced.

It is a schematic explanatory drawing of the deaeration apparatus concerning embodiment of this invention. It is explanatory drawing of the shape of a narrow flow path. It is explanatory drawing of the tank of other embodiment. It is a graph of the deaeration state with and without the decompression tool. It is a graph which shows the influence on the deaeration degree of the pressure reduction degree of a tank. It is a graph which shows the measurement result of oxygen solubility at the time of deaeration, supplying nitrogen to the cavity produced | generated by the cavity production | generation body. It is a schematic explanatory drawing of the deaeration and the inhalation apparatus concerning embodiment of this invention. It is a graph which shows the injection experiment result of the carbon dioxide with respect to water.

  The deaeration device and the deaeration / aeration device according to the present invention provide a separation point in the liquid flow path, and the liquid generated in the cavity generated by peeling off the solid-liquid interface by the tension acting on the separation point. In particular, instead of removing the gas deposited in the cavity with a suction device such as a vacuum pump connected to the cavity, the inside of the tank storing the liquid is depressurized. By doing so, deaeration is promoted.

  It should be noted that the intense cavitation state in which a large cavity is generated by causing the peeling of the solid-liquid interface is a physical phenomenon different from general cavitation, and the present inventors call it “super cavitation”. Yes.

  Here, “general cavitation” means that microbubbles called cavitation nuclei pre-existing in the liquid expand due to ultrasonic vibration or pressure fluctuations caused by the flow in the shear direction generated in the liquid. Thus, it is a phenomenon that grows up to a bubble having a size that can be visually recognized, and is a phenomenon that is not accompanied by peeling of the solid-liquid interface.

  In super cavitation, the solid-liquid interface peels off due to the tension acting on the peeling point, creating a vacuum state due to the solid-liquid interface peeling and dissolving in the liquid in the vacuum part in contact with the liquid. Gas precipitation occurs, and a large cavity filled with the deposited gas is generated. This idea was discussed in detail in Proc. IMechE, Vol. 222, Part C: J. Mechanical Engineering Science, pp. 667-678.

  Therefore, the present inventors considered that in the degassing device previously invented, it was possible to degas by removing the gas deposited in the cavity with a vacuum pump or the like. During research and development to improve and improve dissolution efficiency in the deaeration and dissolution apparatus, we discovered a phenomenon in which deaeration occurs even when the gas in the cavity is not removed.

  As a result of examining this phenomenon in detail, at the downstream end of the cavity generated by super cavitation, a bubble is formed by gas being pulled from the cavity by the momentum of the liquid flow, and the formed bubble is directly downstream. To the tank provided downstream, and disappears by rising to the liquid level in the tank, while being degassed by releasing the gas in the bubbles as it disappears I found out.

  Moreover, in the cavities generated by supercavitation, gas is precipitated in the cavities, while the precipitated gas is separated from the cavities as bubbles, so that a substantially constant shape and size are maintained. By increasing the contact area between the liquid and the liquid, it is possible to more effectively promote gas deposition in the cavity and improve the deaeration efficiency.

  Furthermore, in the deaeration device and the deaeration / aeration device of the present invention, the gas deposited from the liquid is effectively reduced by depressurizing the inside of the tank storing the liquid together with the bubbles generated by being torn from the cavity. It can be removed to promote deaeration.

  Below, the deaeration apparatus which is embodiment of this invention is demonstrated.

  As shown in the schematic schematic diagram of FIG. 1, the deaeration device of the present embodiment includes a tank 10 that stores the liquid L1, and a pump 20 that serves as a pumping means for pumping and circulating the liquid in the tank 10 in the downstream direction. One end of the tank 10 is connected to the suction port of the pump 20 and the other end is connected to the suction port of the pump 20; the other end is connected to the discharge port of the pump 20; A second pipe 40 that is connected to the tank 10, a cavity generator 50 that is provided in the middle of the second pipe 40 and generates cavities and bubbles by supercavitation, and a decompressor 60 that depressurizes the tank 10. Yes.

  The tank 10 is a container that can store a predetermined amount of the liquid L1, and can be sealed. In particular, since the tank 10 is depressurized, it has a predetermined pressure resistance. The liquid L1 may be any liquid material in which a gas is dissolved, such as water or oil, and may be any liquid material that can be fed by the pump 20, and may be a solid material such as powder or fiber. It may be a liquid material in which is mixed.

  One end of the first pipe 30 is connected to the tank 10 so that the liquid L1 in the tank 10 can be sent out from the first pipe 30.

  The other end of the first pipe 30 is connected to the suction port of the pump 20, and the liquid L1 in the tank 10 is sucked by the pump 20 through the first pipe 30, and a predetermined amount is provided downstream from the discharge port of the pump 20. It can be pumped by pressure. Note that the pumping means is not limited to the pump 20, and any pumping means may be used as long as the liquid L1 in the tank 10 can be pumped in the downstream direction with a predetermined pressure.

  By connecting one end of the second pipe 40 to the discharge port of the pump 20 and connecting the other end of the second pipe 40 to the tank 10, the tank 10 → the first pipe 30 → the pump 20 → the second A circulation path from the pipe 40 to the tank 10 is formed, and the liquid L1 in the tank 10 can be circulated by the pump 20. Although not shown, a relief valve or a throttle is provided in this circulation path as necessary so that the liquid L1 can be stably fed at a predetermined flow rate. In some cases, a temperature adjusting device such as a cooler that keeps the temperature of the liquid L1 constant is provided in the circulation path or the tank 10 to cause fluctuations in the solubility of the gas of the liquid L1 as the temperature of the liquid L1 changes. This may be suppressed and stable deaeration may be possible. In the present embodiment, a cooler is provided in the circulation path to keep the liquid L1 at a constant temperature.

  In the present embodiment, the cavity generator 50 provided in the middle of the second pipe 40 is a cylindrical hole constriction, and as shown in FIG. 1, a shield that bulges inward on the inner surface of the second pipe 40. The wall 52 forms a narrow channel 51 that narrows the flow area of the liquid L1. The cavity generator 50 is not limited to the cylindrical aperture stop, and any cavity generator may be used as long as it can generate a cavity as described later.

  In the present embodiment, the second pipe 40 is cut halfway, and a connecting tool (not shown) for connecting to the cavity generator 50 is attached to the cut end portion, and the second pipe 40 is connected via this connecting tool. By connecting to the cavity generator 50, the cavity generator 50 is disposed in the middle of the second pipe 40.

  Further, in this embodiment, as shown in FIG. 2A which is an XX end view of FIG. 1, the end face shape of the narrow channel 51 is a long hole shape, and a cavity generator 50 that generates a cavity 53 is formed. The length of the peeling wall is made as large as possible. Note that the end face shape of the narrow channel 51 is not limited to a long hole shape, and any shape can be used as long as the separation wall length of the cavity generator 50 that generates the cavity 53 is as large as possible. In particular, in particular, as shown in FIG. 2B, two narrow channels 51 ′ and 51 ′ may be provided, or two or more narrow channels may be provided.

  Further, the narrow channel 51 is uniform along the flow direction of the liquid L1, and the length of the narrow channel 51 is such that the downstream end of the cavity 53 is located in the narrow channel 51 as shown in FIG. However, in the case of degassing only, the narrow channel 51 is compared with the cavity 53 so that the downstream end of the cavity 53 reaches the downstream side of the narrow channel 51. It may be shortened.

  As shown in FIG. 1, the shielding wall 52 constituting the cavity generator 50 is provided with a right-angled corner as a separation point 54 at the upstream edge. In this way, by providing the cavity generator 50 with the separation point 54, the liquid L1 is separated from the flow path surface of the narrow flow path 51, and the solid-liquid interface is peeled off, so that the cavity 53 can be easily generated. Can do. Note that the peeling point 54 is not limited to a case where the peeling point 54 is formed by a right-angled corner, and may be formed by a protrusion having a sharp tip, for example, or a cavity caused by super cavitation can be generated. If it is, it can also be comprised by the processus | protrusion with which the front-end | tip became an obtuse angle.

  In order to prevent the gas in the bubbles generated by tearing from the cavity 53 based on the super cavitation generated by the cavity generator 50 from being re-dissolved in the liquid L1, the cavity generator 50 is It is desirable to provide it close to the tank 10.

  Further, the second pipe 40 connected to the tank 10 is connected to the end of the tank 10 in the vicinity of the liquid level of the liquid L1 in the tank 10 so as to communicate with the bubble liquid L1 in the tank 10. It is desirable to suppress the gas in the bubbles from re-dissolving in the liquid L1 by making the contact time as short as possible.

  Alternatively, for example, as shown in FIG. 3, a slope 11 having a predetermined inclination angle is provided in the tank 10 ′ at a position above the liquid level of the liquid L <b> 1, and the tank is provided from the second pipe 40 on the upper surface of the slope 11. A thin liquid film may be formed by flowing the liquid L1 mixed with bubbles returned to 10 ′, and the bubbles may be easily brought into contact with the atmosphere to prevent the gas in the bubbles from re-dissolving in the liquid L1. In FIG. 3, 12 is a splash cover that prevents the liquid L1 returned from the second pipe 40 to the tank 10 'from splashing.

  The decompression tool 60 for decompressing the inside of the tank 10 may be a vacuum pump. However, in this embodiment, the auxiliary tank 61 that stores the liquid L2 and the auxiliary tank 61 that pumps and circulates the liquid L2 in the auxiliary tank 61 in the downstream direction. An auxiliary pump 62 as a pressure feeding means, a first auxiliary pipe 63 having one end connected in communication with the auxiliary tank 61 and the other end connected in communication with a suction port in the suction portion of the auxiliary pump 62, and a discharge in the discharge portion of the auxiliary pump 62 A second auxiliary pipe 64 having one end connected to the outlet and the other end connected to the auxiliary tank 61, and a decompression cavity generator 65 provided in the middle of the second auxiliary pipe 64 to generate a cavity 66 by super cavitation. A decompression tool 60 is configured by the communication pipe 67 that connects the cavity 66 generated by the decompression cavity generator 65 and the space above the liquid level of the liquid L1 in the tank 10.

  The auxiliary tank 61 is a container that can store a predetermined amount of the liquid L2, and it is desirable that the liquid L2 stored in the auxiliary tank 61 is in contact with the outside air. The liquid L2 may be any liquid material such as water or oil and may be any liquid material that can be fed by the auxiliary pump 62, preferably the same as the liquid L1 contained in the tank 10, or It is desirable that the liquid is free from problems such as deterioration even when mixed with the liquid L1.

  One end of a first auxiliary pipe 63 is connected to the auxiliary tank 61 so that the liquid L2 in the auxiliary tank 61 can be sent out from the first auxiliary pipe 63.

  The other end of the first auxiliary pipe 63 is connected to the suction port of the auxiliary pump 62, and the liquid L2 in the auxiliary tank 61 is sucked by the auxiliary pump 62 through the first auxiliary pipe 63, and the discharge port of the auxiliary pump 62 is discharged. The pump can be pumped at a predetermined pressure from the downstream side. The auxiliary pumping means is not limited to the auxiliary pump 62, and any pumping means may be used as long as the liquid L2 in the auxiliary tank 61 can be pumped in the downstream direction with a predetermined pressure.

  One end of the second auxiliary pipe 64 is connected to the discharge port of the auxiliary pump 62 and the other end of the second auxiliary pipe 64 is connected to the auxiliary tank 61 so that the auxiliary tank 61 → the first auxiliary pipe 63 is connected. → Auxiliary pump 62 → second auxiliary pipe 64 → Auxiliary tank 61 is circulated, and the liquid L2 in the auxiliary tank 61 can be circulated by the auxiliary pump 62. Although not shown, a relief valve and a throttle are also provided in this circulation path as necessary so that the liquid L2 can be stably fed at a predetermined flow rate. In the decompression tool 60, the liquid L2 is not necessarily circulated, but the liquid L2 is circulated in order to reduce the amount of the liquid L2 used as much as possible.

  The decompression cavity generator 65 provided in the middle of the second auxiliary pipe 64 is also a so-called cylindrical hole constriction, and is provided to bulge inward on the inner side surface of the second auxiliary pipe 64 as shown in FIG. A narrow channel 65a with a reduced flow area of the liquid L2 is formed by the shielding wall 65b. The shielding wall 65b is provided with a right-angled corner as a peeling point 65c at the upstream edge. In the present embodiment, the second auxiliary pipe 64 is cut halfway, and a connecting tool (not shown) for connecting to the decompression cavity generator 65 is attached to the cut end portion. The decompression cavity generator 65 is disposed in the middle of the second auxiliary pipe 64 by being connected to the decompression cavity generator 65 via the.

  In this embodiment, the decompression cavity generator 65 has a narrow channel 65a as a cylindrical hole, but may have a long hole shape having the same structure as the cavity generator 50. Further, the decompression cavity generator 65 is provided with a through hole 65d connected to the narrow channel 65a, and the through hole 65d can communicate with the cavity 66 generated in the narrow channel 65a.

  One end of the communication pipe 67 is connected to the through hole 65d, the other end of the communication pipe 67 is connected to the tank 10, and the decompression cavity generator 65 and the tank 10 are connected to each other via the communication pipe 67. . In particular, the end of the communication pipe 67 that is connected to the tank 10 is connected to the upper part of the tank 10 as much as possible, so that it is generated in the space above the liquid level of the liquid L1 in the tank 10 and the decompression cavity generator 65. The cavity 66 is connected in communication.

  When the liquid L2 in the auxiliary tank 61 is circulated by the auxiliary pump 62 and the cavity 66 is generated in the decompression cavity generator 65, the inside of the cavity 66 is in a much lower pressure than the atmospheric pressure, and the communication is established. By connecting the cavity 66 and the space above the liquid level of the liquid L1 in the tank 10 through the pipe 67, the inside of the tank 10 can be decompressed.

  Thus, when performing degassing of the liquid L1 with the configured degassing device, the liquid L1 in the tank 10 is circulated by the pump 20 to generate the cavity 53 by supercavitation in the cavity generator 50, and the tank 10 The bubbles formed by tearing from the cavity 53 are fed.

  Further, the liquid L2 in the auxiliary tank 61 is circulated by the auxiliary pump 62 to generate the cavity 66 in the decompression cavity generator 65, so that the inside of the tank 10 is depressurized by the cavity 66 and is fed into the tank 10. Thus, the degassing efficiency is improved by removing from the tank 10 the gas released from the bubbles disappeared at the liquid level of the liquid L1.

FIG. 4 is a graph showing the effect of improving the deaeration efficiency with and without the decompression tool 60. Here, the liquid L1 is water, the black circle is the case where the decompression tool 60 is not provided and the inside of the tank 10 is at atmospheric pressure, and the white circle is 50 kPa, which is about half of the atmospheric pressure inside the tank 10 by the decompression tool 60. Is the case. FIG. 5 is a graph showing that the amount of dissolved oxygen in water decreases, that is, the degree of deaeration improves by lowering the degree of decompression of the tank 10, and the amount of dissolved oxygen when the internal pressure of the tank 10 is 40 kPa. D _o is seen to decrease to 1 ppm (mass ratio). Thus, it can be seen that the deaeration efficiency is clearly improved by reducing the pressure in the tank 10.

  In particular, since the pressure in the tank 10 is reduced, the air bubbles that flow into the tank 10 from the second pipe 40 expand, and the buoyancy increases with this expansion, so that the air bubbles quickly reach the liquid level of the liquid L1. As a result, the degassing efficiency can be improved by suppressing the gas in the bubbles from re-dissolving in the liquid L1, and the penetration from the surface can also be suppressed.

  When the pressure in the tank 10 is reduced, the pump 20 may start the pressure reduction in the tank 10 at the same time as the supply of the liquid L1 to the cavity generator 50 is started. May occur and noise may be generated. This is considered to be due to the fact that a large amount of gas is precipitated immediately after the start of deaeration when the dissolved amount of the gas dissolved in the liquid L1 is large.

  Therefore, when vibration or noise occurs with the start of decompression in the tank 10, the pump 20 starts feeding the liquid L1 to the cavity generator 50, and after the liquid L1 is slightly degassed, the tank Generation of vibration and noise can be reduced by starting depressurization within 10. More specifically, as shown in FIG. 4, since the liquid L1 can be degassed by about 50% in about 5 minutes without depressurizing the inside of the tank 10, the depressurization in the tank 10 may be started thereafter.

  In the present embodiment, the tank 10 only contains a predetermined amount of the liquid L1, but for example, the tank 10 is used as a hydraulic oil storage tank of the hydraulic circuit, and the hydraulic oil supply piping and return pipe are supplied to the tank 10. It is possible to use hydraulic fluid that is always degassed by connecting the pipes for communication, or by connecting another storage tank to the tank 10 via an appropriate pipe. The liquid L1 can be made usable while the degassed liquid L1 is replaced with the liquid L1 that has not been sufficiently degassed in the storage tank.

  In this way, in the deaeration device, by using the cavity 66 by super cavitation as the pressure reducing means in the tank 10, the pressure reducing means can be configured without using expensive equipment such as a vacuum pump, and the cost can be reduced. In addition, it is possible to improve the maintainability.

  Further, in the deaeration device, in the same way as the through-hole 65d provided in communication with the narrow flow path 65a in the decompression cavity generator 65, a through-hole (see FIG. (Not shown) may be provided, and an inert gas such as nitrogen may be supplied to the cavity 53 through the through hole.

In this way, by supplying a specific gas to the cavity generated in the cavity generator 50 that is the cavity generating means, the specific gas is dissolved in the liquid, while other gases dissolved in the liquid are degassed. Efficiency can be improved. In addition, when deaeration is performed while supplying about 1 atm of nitrogen to the cavity generated in the cavity generator 50 with respect to 30 L of tap water, as shown in FIG. 6, the oxygen solubility D _o after 30 minutes. Was 0.5 ppm or less. In this case, the tank 10 is not depressurized, and the oxygen solubility _Do can be further reduced simply by supplying nitrogen.

  FIG. 7 is a schematic diagram of a deaeration / aeration device based on the above-described deaeration device, except that gas supply means for supplying a predetermined gas to be dissolved in the liquid L1 is provided. It is. Therefore, the same components as those in the above-described deaeration device are denoted by the same reference numerals, and redundant description is omitted.

  In the case of a degassing / air-injecting device, in order to dissolve a predetermined gas in the liquid L1, the cavity generator 50 ′ is provided with a narrow channel 51 that can generate a large and stable cavity 53 by super cavitation, A through hole 55 connected to the narrow channel 51 is provided, and the through hole 55 can communicate with the cavity 53 generated in the narrow channel 51 portion. Here, the narrow channel 51 that can generate a large and stable cavity 53 differs depending on the viscosity of the liquid L1 and the flow conditions, but is generated by super cavitation when the liquid L1 flows at a predetermined flow rate. It is sufficient that the cavity 53 and the through hole 55 communicate with each other.

  One end of the first gas pipe 71 connected in communication with the gas tank 70 containing gas that dissolves in the liquid L1 at one end is connected to the through-hole 55 so that a predetermined gas can be supplied to the cavity 53 by super cavitation. It is said. A first switching valve 72 is provided in the middle of the first gas pipe 71. The first switching valve 72 is closed when degassing, and is opened when injecting air. These are gas feeding means. In the first gas pipe 71, a predetermined gas can be supplied from the gas tank 70 while maintaining a predetermined pressure using a pressure reducing valve or the like.

  When gas is supplied, the gas supplied from the gas tank 70 is filled in the cavity 53, so that a predetermined gas can be enclosed in bubbles formed by tearing from the cavity 53 by the liquid flow. In particular, the predetermined gas sealed in the bubble has a higher pressure than the gas in the bubble formed in the case of degassing, and the gas is easily dissolved in the liquid L1, which is effective. Can be dissolved.

  Further, in the deaeration / aeration apparatus, the second pipe 40 is branched into a degassing distribution pipe 41 and an inflowing distribution pipe 42 on the downstream side of the cavity generating body 50 ′ serving as the cavity generating means. The hour circulation pipe 41 is connected to the tank 10 so as to be closer to the liquid level of the liquid L1 in the tank 10 than the air circulation pipe 42.

  A second switching valve 43 is provided in the middle of the degassing distribution pipe 41, and the second switching valve 43 is opened when degassing and is closed when air is supplied. In addition, a third switching valve 44 is provided in the middle of the air supply circulation pipe 42. The third switching valve 44 is in a closed state when degassing and is in an open state when injecting air. In the present embodiment, the second switching valve 43 and the third switching valve 44 perform flow path switching between degassing and inhaling, but using one switching valve such as a two-way valve. Also good.

  By connecting the degassing distribution pipe 41 closer to the liquid level of the liquid L1 in the tank 10 than the inflowing distribution pipe 42 and communicating with the tank 10, the degassing distribution pipe 41 is connected to the tank 10 during the degassing. The air bubbles that flow into the liquid L1 promptly rise to the liquid level of the liquid L1 and prevent the gas in the air bubbles from re-dissolving in the liquid L1, while at the time of air inflow, flow into the tank 10 from the inflow gas distribution pipe 42. The time required for the bubbles to rise to the liquid level of the liquid L1 is made as long as possible to improve the dissolution efficiency of the gas in the bubbles in the liquid L1.

  Further, in the deaeration / aeration apparatus, a second gas pipe 73 is provided to connect the gas tank 70 and the tank 10 in communication, and the gas tank 70 supplies air to the space above the liquid level of the liquid L1 in the tank 10 at the time of air injection. The supplied gas is sent to pressurize the liquid L1 in the tank 10 to a predetermined pressure. The second gas pipe 73 can also supply a predetermined gas from the gas tank 70 while maintaining a predetermined pressure using a pressure reducing valve or the like. A fourth switching valve 74 is provided in the middle of the second gas pipe 73, and the fourth switching valve 74 is closed when degassing and is opened when injecting air.

  By pressurizing the inside of the tank 10 using the gas dissolved in the liquid L1, the solubility of the gas dissolved in the liquid L1 in the liquid L1 can be improved, and more gas can be dissolved in a shorter time. Thus, the dissolution efficiency can be improved. Since the tank 10 is in a pressurized state, it is desirable to provide an appropriate relief valve.

  The pressure of the gas supplied from the second gas pipe 73 into the tank 10 and the pressure of the gas supplied from the first gas pipe 71 to the cavity 53 may be the same or different.

  As shown in FIG. 7, the communication pipe 67 that connects the tank 10 and the pressure reducing device 60 is provided with a fifth switching valve 75, which is opened when degassing and is closed when inflating. The pressure of the tank 10 in the state is prevented from affecting the decompression tool 60. Needless to say, the operation of the decompression tool 60 is stopped during the air injection.

  In the present embodiment, the liquid L1 in the tank 10 is pressurized using the gas supplied from the gas tank 70. For example, the liquid L1 is reduced by reducing the internal volume of the tank 70 while maintaining the airtightness of the tank 70. The tank 70 may be provided with a piston-like or bellows-like movable wall, and the liquid L1 may be pressurized by reducing the internal volume of the tank 70 by moving the movable wall.

  The deaeration / aeration apparatus can thus dissolve the required gas in a short time after degassing the non-processed liquid in a short time, and can improve the production efficiency.

  Specifically, in the deaeration / aeration apparatus of the present embodiment, when carbon dioxide is dissolved at a different pressure with respect to 30 L of water, as shown in FIG. Almost no carbon dioxide can be dissolved and almost saturated.

10 tanks
20 Pump
30 First piping
40 Second piping
50 Cavity generator
51 Narrow channel
52 Shielding wall
53 cavity
54 Peeling point
60 decompression tool
61 Auxiliary tank
62 Auxiliary pump
63 1st auxiliary piping
64 Second auxiliary piping
65 Vacuum generator for decompression
65a Narrow channel
65b Shielding wall
65c Release point
65d through hole
66 cavity
67 Communication pipe

Claims (6)

A tank for storing liquid;
A pumping means for pumping the liquid in the tank in the downstream direction;
A first pipe connecting one end to the tank and connecting the other end to the suction part of the pressure feeding means;
A second pipe that communicates and connects one end to the discharge portion of the pumping means and communicates the other end to the tank;
A cavity generating means provided in the middle of the second pipe for generating a cavity by super cavitation;
A degassing device comprising pressure reducing means for reducing the pressure in the tank. The decompression means includes
An auxiliary tank for storing liquid;
Auxiliary pumping means for pumping the liquid in the auxiliary tank in the downstream direction;
A first auxiliary pipe that connects one end to the auxiliary tank and connects the other end to the suction portion of the auxiliary pumping means;
A second auxiliary pipe that communicates and connects one end to the discharge portion of the auxiliary pumping means and communicates the other end to the auxiliary tank;
A decompression cavity generating body that is provided in the middle of the second auxiliary pipe and generates a cavity by super cavitation;
The deaerator according to claim 1, further comprising a communication pipe that communicates and connects a cavity generated by the decompression cavity generator and a space above the liquid level in the tank.   The degassing apparatus according to claim 1 or 2, wherein a predetermined gas is fed into the cavity generated by the cavity generating means, and the gas is dissolved in the liquid. A tank for storing liquid;
A pumping means for pumping the liquid in the tank in the downstream direction;
A first pipe connecting one end to the tank and connecting the other end to the suction part of the pressure feeding means;
A second pipe that communicates and connects one end to the discharge portion of the pumping means and communicates the other end to the tank;
A cavity generating means provided in the middle of the second pipe for generating a cavity by super cavitation;
Gas supply means for supplying a predetermined gas into the cavity, and after degassing the liquid while circulating the liquid through the first pipe and the second pipe, the gas A degassing / air infusing device for feeding the gas into the cavity by a feeding means and dissolving it in the liquid;
A degassing / gassing device provided with a decompression means for decompressing the inside of the tank when degassing the liquid. The decompression means includes
An auxiliary tank for storing liquid;
Auxiliary pumping means for pumping the liquid in the auxiliary tank in the downstream direction;
A first auxiliary pipe that communicates and connects one end to the auxiliary tank and communicates and connects the other end to the suction portion of the auxiliary pressure feeding means;
A second auxiliary pipe that communicates and connects one end to the discharge portion of the auxiliary pumping means and communicates the other end to the auxiliary tank;
A decompression cavity generating body that is provided in the middle of the second auxiliary pipe to generate a cavity by super cavitation,
5. The deaeration and insufflation apparatus according to claim 4, further comprising a communication pipe that connects the cavity generated by the decompression cavity generator and the space above the liquid level in the tank. .   The second pipe is branched into a degassing distribution pipe and an inflowing distribution pipe on the downstream side of the cavity generating means, and the inflowing circulation pipe is at the bottom of the tank more than the degassing distribution pipe. The liquid is connected to the tank on the side, and the liquid is circulated through the degassing flow pipe during degassing, and the liquid is circulated through the gas flow distribution pipe during air filling. Item 6. The deaeration / aeration device according to Item 5.

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