JP2020040009A - Gas generator - Google Patents

Abstract

To solve the following problem: in a gas generator for improving water quality, when a channel is branched into multiple channels and simultaneously gases are discharged, it is difficult to control a gas flow rate of each of a plurality of connected discharge nozzles due to the influence of load pressure differences among the plurality of discharge nozzles, which results in the occurrence of difference in gas concentrations in water areas of the discharge nozzles.SOLUTION: A gas generator 1 for supplying one or a plurality of water tanks 45, 46 with a gas for improving water quality includes: a gas generating part 2; a plurality of gas discharge nozzles 6, 7 connected to the gas generating part through respective branched gas passages 13; discharge selector valves 3, 4, 5 for opening and closing the gas passages for each gas discharge nozzle; and a controller 8 for controlling the opening and closing for each gas discharge nozzle. By switching the discharge nozzles sequentially, a gas is discharged by avoiding the influence of load pressure differences among the plurality of connected discharge nozzles 43, 44.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a gas generator having a plurality of gas outlets for supplying gas for improving water quality to a water tank.

  Conventionally, in markets that require water quality improvement such as aquaculture and sewage treatment, discharge nozzles for gas generators for air, oxygen gas, ozone gas, etc. are installed in existing water tanks without constructing new large-scale water tank circulation equipment. It is often installed to improve water quality. It is known that the smaller the bubble size of the discharged bubbles, the more efficiently the gas is dissolved in water (for example, see Patent Document 1).

JP 2011-224461 A

Even if one discharge nozzle connected to one gas generator is installed in an existing water tank that improves water quality, the water quality is improved only in the water area near the discharge nozzle, and the entire water tank is improved in water quality. For this purpose, the gas flow path must be branched outside one gas generator, and a plurality of discharge nozzles must be installed in one water tank. The same applies to the case where the water quality of a plurality of water tanks is improved by one gas generator.
However, if the gas flow path is branched outside one gas generator and gas is discharged at the same time, differences occur due to the load pressure of the piping to each discharge nozzle and the load pressure due to the water pressure of the discharge nozzle installation depth. However, the effect of improving water quality varies for each discharge nozzle.

  In many simple micro-bubble generating nozzles, a gas passage through which gas is discharged is fine. Therefore, the nozzles are clogged as they are used, and the difference in the load pressure between the discharge nozzles fluctuates depending on the installation conditions and the method of use.

  The present invention solves the above-described problems, and a single gas generator can perform a predetermined pressure from a plurality of discharge nozzles without being affected by a difference between load pressures of flow paths until gas discharge. It is an object of the present invention to provide a gas generator capable of discharging a gas flow rate.

  In order to solve the above problem, the invention according to claim 1 is a gas generator that supplies a gas for improving water quality to one or a plurality of water tanks through an external pipe, wherein the gas generator includes: A plurality of gas discharge ports connected via gas flow paths branched to a generator, a discharge switching valve provided in the gas flow paths, for opening and closing the gas flow paths for each of the gas discharge ports, and discharging a gas; And a control unit that controls the opening and closing of each of the discharge switching valves so as to switch the gas discharge ports.

  According to a second aspect of the present invention, in the first aspect, the control unit sequentially controls an opening time for each of the discharge switching valves.

  According to a third aspect of the present invention, in the first or second aspect of the invention, a pressure sensor is provided in the gas flow path upstream of the discharge switching valve, and the control unit includes the pressure sensor. The gist of the invention is to control the opening time of each of the discharge switching valves based on the measurement value of the discharge switching valve.

  According to a fourth aspect of the present invention, in the first or second aspect of the present invention, a flow sensor is provided in the gas flow path upstream of the discharge switching valve, and the control unit includes the flow sensor. The gist of the invention is to control the opening time of each of the discharge switching valves based on the measurement value of the discharge switching valve.

  According to a fifth aspect of the present invention, in the first aspect of the present invention, the control unit determines an open time for each of the discharge switching valves based on a flow rate characteristic of the gas generating unit due to a load pressure. The point is to control.

  According to a sixth aspect of the present invention, in the first aspect of the present invention, an operation unit for setting the gas discharge amount to the water tank in the control unit is provided.

  According to the gas generator of the present invention, a gas generator, a plurality of gas outlets connected via a gas flow path branched to the gas generator, and the gas flow path provided for the gas flow path, A discharge switching valve that opens and closes the gas flow path; and a control unit that controls opening and closing of each of the discharge switching valves so as to switch the gas discharge port that discharges gas. Thereby, even if a plurality of discharge nozzles are used in one water tank or a plurality of water tanks, switching between opening and closing of a plurality of gas discharge ports by a discharge switching valve of a gas generator allows a plurality of gas discharge ports to be discharged. It is possible to discharge a gas flow rate that matches the load pressure of the flow path up to each discharge without being affected by the difference in load pressure.

Further, when sequentially controlling the opening time for each of the discharge switching valves, the control unit sequentially switches the discharge to each gas discharge port, and discharges for a time corresponding to each load pressure, so that a plurality of gases are discharged. The gas concentration in the water can be predicted and the water tank can be managed without being affected by the difference in the load pressure until the discharge. In addition, since the gas is sequentially and repeatedly discharged, each nozzle has a problem that the gas concentration in the water generated by repeatedly discharging and stopping the gas becomes unstable, but the opening time of the discharge switching valve is shortened. The gas is stably generated by successively opening the cutout and the discharge port, and the effect of improving the water quality can be stabilized.
Thus, the gas discharge amount can be adjusted among the plurality of discharge nozzles within the range of the gas generation amount of the gas generator. In addition, for example, by releasing one discharge port or one branch of the gas flow path to the outside air, even in a gas generator with a constant flow rate without flow rate adjustment, the time per hour required by the discharge nozzle can be improved. It is also possible to adjust the gas discharge amount.

Further, in the gas flow path, a pressure sensor is provided upstream of the discharge switching valve, and the control unit controls an opening time of each discharge switching valve based on a value measured by the pressure sensor. Can determine the timing of switching each gas discharge port by a value based on the pressure of the gas flow path until the gas discharge, and the flow rate of each discharge port can be determined by the load pressure of each flow path. Furthermore, even in an environment where the load pressure fluctuates, such as clogging of the discharge nozzles, by constantly monitoring the pressure, the required gas discharge amount from each discharge nozzle can be stably controlled within the range of the gas generation amount. Can be ejected.
As described above, the flow rates of the plurality of discharge ports can be managed with only an inexpensive pressure sensor without providing expensive flow control means.

  Further, in the gas flow path, a flow rate sensor is provided upstream of the discharge switching valve, and the control unit controls an opening time of each discharge switching valve based on a value measured by the flow rate sensor. Can determine the timing of switching each gas discharge port based on the flow rate of the gas generator until the gas is discharged. Discharge can be performed within the range of the amount.

  Further, when the control unit controls the opening time of each of the discharge switching valves based on a flow rate characteristic of the gas generating unit based on a load pressure, even if the load pressure of the flow path to each gas discharge is different. In addition, a required amount of gas discharge per time can be discharged from each of the plurality of discharge nozzles.

  Further, when an operation unit for setting the gas discharge amount to the water tank to the control unit is provided, it is easy to set or change the gas discharge amount and the discharge time according to the target water tank. Become.

  According to the gas generator as described above, even if the load pressure of the flow path up to the gas discharge in the plurality of discharge nozzles is different, the required gas discharge amount can be discharged, and the entire water tank can be discharged. Alternatively, the water quality of a plurality of aquariums can be managed.

The invention will be further described in the following detailed description, given by way of non-limiting example of an exemplary embodiment according to the invention and with reference to the referenced figures, wherein like reference numerals are used to refer to the figures. Similar parts are shown throughout the several figures.
It is a block diagram of a gas generator concerning an example. 4 is a graph and a calculation formula illustrating an example of a flow rate characteristic of a gas generating unit depending on a load pressure. It is a block diagram of a gas generator concerning other forms.

  The matters shown here are for the purpose of exemplifying the exemplary embodiments and the embodiments of the present invention, and should be described so that the principles and conceptual features of the present invention can be most effectively and easily understood. It is intended to provide what seems to be possible. In this regard, it is not intended to show the structural details of the invention beyond that which is necessary for a basic understanding of the invention, and that some forms of the invention will be It will be clear to those skilled in the art how it is actually embodied.

The gas generator according to the present embodiment is a gas generator (1) that supplies a gas for improving water quality to one or a plurality of water tanks (45, 46) via external pipes (41, 42). A gas generator (2), a plurality of gas discharge ports (6, 7) connected via a gas channel (13) branched to the gas generator (2), and a gas channel (13); A discharge switching valve (3, 4, 5) for opening and closing a gas flow path (13) for each gas discharge port (6, 7), and a discharge switching valve for switching a gas discharge port (6, 7) for discharging gas. (3 to 5) and a control unit (8) for controlling opening and closing (for example, see FIGS. 1 and 3). The discharge switching valves (3 to 5) are respectively provided in the branch passages (13a to 13c) of the gas flow path (13), and each of the branch passages (13a) is opened and closed by opening and closing the discharge switching valve (3 to 5). To 13c) are turned on / off.
In addition, discharge nozzles (43, 44) are connected to the respective gas discharge ports (6, 7) via external pipes (41, 42). Usually, the discharge nozzles (43, 44) are installed in one or more water tanks (45, 46).
In the above case, for example, the control unit (8) may control the discharge switching valves (3 to 5) so that the plurality of gas discharge ports (5, 6) are selectively opened in a predetermined order. it can. Thereby, the gas discharge ports (6, 7) from which the gas is discharged are switched in a predetermined order.
Further, the control unit (8) can sequentially control the opening time for each of the discharge switching valves (3 to 5). The opening time of each of the discharge switching valves (3 to 5) may be the same or may be different.

As the gas generator according to the present embodiment, for example, the control unit (8) sets the discharge switching valves (3 to 5) so as to open the plurality of gas discharge ports (6, 7) one by one. A control mode (for example, see FIGS. 1 and 3) is given.
In the above case, for example, the gas generator (1) can include an operation unit (11) for setting the gas discharge amount to each of the water tanks (45, 46) in the control unit (8). The configuration and function of the operation unit (11) are not limited. For example, in order to control the amount of gas discharged from each of the gas discharge ports (6, 7), for example, the opening time, open time of each of the discharge switching valves (3 to 5) are controlled. The order of the states, the total time (cycle time) for opening each of the discharge switching valves (3 to 5), and the like can be set as necessary.

In the gas generator according to the present embodiment, for example, the gas flow path (13) is provided with a pressure sensor (21), and the control unit (8) outputs a value measured by the pressure sensor (21). There is a form (for example, see FIG. 1 and the like) in which the opening time of each of the discharge switching valves (3 to 5) is controlled based on this.
For example, the gas flow path (13) is provided with a flow rate sensor (31), and the control unit (8) controls each of the discharge switching valves (3 to 3) based on the measurement value of the flow rate sensor (31). 5) A mode of controlling the opening time (for example, see FIG. 3).

The gas generating section (2) generally has a characteristic that a flow rate per unit time changes according to a load pressure (for example, see FIG. 2). Therefore, if the pressure (load pressure) when each of the discharge switching valves (3 to 5) is opened is measured by the pressure sensor (21), the flow rate from the gas generator (2) can be obtained. Therefore, by providing the pressure sensor (21), the control unit (8) can control the gas discharge amount according to the load pressure of each gas discharge nozzle (43, 44). The control of the gas discharge amount may be performed by opening the discharge switching valves (3 to 5) in accordance with the load pressure. Further, if the flow rate when each of the discharge switching valves (3 to 5) is opened is measured by the flow rate sensor (31), the gas discharge amount from each of the gas discharge ports (5, 6) can be controlled. In addition, it is possible to know the load pressure of each gas discharge nozzle (43, 44).
The load pressure-flow rate characteristics of the gas generator (2) can be stored in a memory in the controller (8). Regardless of the configuration, for example, the load pressure-flow rate characteristic may be stored as a table, and the gas discharge amount may be controlled with reference to the table, or the approximate expression of the load pressure-flow rate characteristic (see F in FIG. 2). ) May be stored, and the gas discharge amount may be controlled by calculating from the measured value.
The control unit (8) may be configured to control the opening time of each of the discharge switching valves (3 to 5) based on the flow rate characteristics of the gas generation unit (2) depending on the load pressure. As described above, by adopting a configuration capable of measuring the pressure or the flow rate of the gas flow path (13), even if the load pressure of each gas discharge nozzle (43, 44) is different, the gas generator (1) It is possible to control the gas discharge amount required for the water tank.

  It should be noted that reference numerals in parentheses of each configuration described in the above-described embodiment indicate a correspondence relationship with a specific configuration described in Examples described later.

  Hereinafter, the present invention will be described specifically with reference to the drawings.

  As shown in FIG. 1, a gas generator 2 is provided inside the gas generator 1. The gas generator 2 generates a gas such as air, oxygen gas, and ozone gas. In addition, two gas discharge ports 6 and 7 are connected to the gas generation port 2a of the gas generation unit 2 via a gas flow path 13 branched in three directions toward the downstream. The downstream ends of the branch paths 13a and 13b of the gas flow path 13 are connected to gas discharge ports 6 and 7, respectively. The downstream end of the branch path 13c is open to the outside air inside the gas generator 1. Further, each of the discharge ports 6 and 7 is provided on the surface side of the housing of the gas generator 1. Although the number of gas discharge ports is two here, it can be increased depending on the use situation.

  A pressure sensor 21 that can monitor the external load pressure of the gas generator 1 is provided upstream of the branch passages 13a to 13c of the gas flow path 13. In each of the branch passages 13a to 13c, a discharge for alternately switching between opening and closing of two gas discharge ports 6, 7 (that is, a state in which one discharge port is opened and the other discharge port is closed) is provided. Switching valves 3, 4, and 5 are provided. These discharge switching valves 3 to 5 open and close the branch passages 13a to 13c.

  Further, the gas generator 1 includes a control unit 8 that controls the gas generation unit 2. The control unit 8 is electrically connected to an operation unit 11 for setting time and flow rate, a pressure sensor 21, and discharge switching valves 3 to 5. The control unit 8 includes a CPU (Central Processing Unit), a memory (for example, a ROM (Read Only Memory), a RAM (Random Access Memory), etc.), an input / output circuit, and the like (not shown). The control unit 8 has a function of detecting a signal from the pressure sensor 21. Further, the control unit 8 has a function of controlling the discharge switching valves 3 to 5 so that the two gas discharge ports 6 and 7 are alternately opened and closed.

  Further, the discharge ports 6 and 7 are connected to the base ends of the gas discharge channels 41 and 42 (that is, the external pipes 41 and 42). Discharge nozzles 43 and 44 installed in water tanks 45 and 46 are connected to tips of these flow paths 41 and 42, respectively. The flow paths 41 and 42 have different pipe lengths to the discharge nozzles 43 and 44, and have different water depths at which the discharge nozzles 43 and 44 are installed.

  According to the gas generator 1 of the above embodiment, as the preparatory operation, the discharge switching valves 3 and 4 are sequentially and alternately opened, and the load pressure of the flow paths 41 and 42 is detected by the pressure sensor 21. The control unit 8 is programmed with an approximate expression F representing the relationship between the load pressure of the gas generator 1 and the flow rate per unit time. In the approximate expression F shown in FIG. 2, E represents an exponent. Then, the control unit 8 calculates a gas flow rate that can be discharged at a predetermined time from each of the discharge ports 6 and 7 based on the detected pressure value.

  In this example, when the operation unit 11 selects a gas discharge amount necessary for one minute for either the discharge port 6 or the discharge port 7, the remaining discharge ports are within the range of the gas generation unit 2. The dischargeable flow rate is displayed on the operation unit 11. When the flow rates of all the discharge ports 6 and 7 are selected, the discharge switching valves 3 and 4 are controlled for a predetermined time to discharge gas. As described above, the opening time of each of the discharge switching valves 3 to 5 is controlled by the control unit 8 in one minute, which is the entire cycle time, by the necessary gas discharge amount of each of the discharge ports 6 and 7 and the pressure of each of the flow paths. It is determined.

  For example, the gas generation amount of the gas generator 1 is about 6.0 L / min, the load pressure of the flow path 41 connected to the discharge port 6 is 40 kPa, and the load of the flow path 42 connected to the discharge port 7 is When the pressure is set under the condition of 10 kPa, the control unit 8 uses the calculation formula of FIG. It is calculated that a discharge rate of about 6.1 L / min is possible. When 3.0 L / min desired to be discharged into the water tank 45 of the discharge port 6 is input to the operation unit 11, the water tank 47 of the discharge port 7 is displayed so as to select up to 2.8 L / min. Here, the flow rate up to 2.8 L / min is a flow rate at which discharge can be performed in the remaining time that can be allocated in one minute, which is the entire switching cycle time. Therefore, if the water tank 46 of the discharge port 7 is selected to be 2.5 L / min, the opening time of each of the discharge switching valves 3 to 5 is allocated in one minute which is the entire cycle time, and the discharge switching valve 3 is set to about 31 The gas is discharged from each of the discharge ports so that the discharge switching valve 4 takes about 24.6 seconds for about 0.6 seconds, and the discharge switching valve 5 is opened for the remaining 3.8 seconds to be exhausted to the outside air.

  Here, in order not to make the effect of water quality improvement unstable, it is desirable to shorten the opening time (switching interval of gas discharge) of each discharge switching valve. However, in consideration of the response speed of the discharge switching valve and the time during which the pressure in the flow path is stabilized, the shortest opening time of the discharge switching valve is programmed so as not to be less than 3 seconds. Therefore, the opening time of the discharge switching valves 3 and 4 is controlled so as to be alternately switched in small increments of 3 seconds or more. Although the shortest opening time is 3 seconds here, the time during which the pressure in the flow path is stabilized varies depending on the actual installation conditions, and therefore it is desirable to investigate in advance.

  It should be noted that the present invention is not limited to the above-described embodiment, but may be variously modified within the scope of the present invention according to the purpose and application. That is, in the above-described embodiment, the form including the pressure sensor 21 is exemplified. However, the present invention is not limited to this. For example, as shown in FIG. . Since the flow rate is detected by the flow rate sensor 31, it is not necessary to program the calculation formula F as in the pressure sensor 21. The opening time of each of the discharge switching valves 3 to 5 is determined based on the flow rate in one minute which is the entire cycle time.

  Further, in the above-described embodiment, the discharge nozzles 43 and 44 are provided in each of the plurality of water tanks 45 and 46. However, the present invention is not limited to this. For example, as shown in FIG. May be installed.

  Further, in the above embodiment, the discharge switching valves 3 to 5 that open and close the flow paths are provided in the middle of each of the branch paths 13a to 13c of the gas flow path 13. However, the present invention is not limited to this. A discharge switching valve for switching a flow path may be provided at a branch point of each of the 13 branch paths 13a to 13c.

  The configuration of the gas generator of the present invention is not limited to the configuration of the above-described embodiment, and the configuration may be changed as appropriate without departing from the essence of the claimed invention.

  INDUSTRIAL APPLICABILITY The present invention is widely used as a technology related to gas generation for improving water quality such as aquaculture and sewage treatment.

  1. Gas generator, 2. Gas generation section, 3.4.5. Discharge switching valve, 6.7. 7. outlet; Control unit, 11. Operation unit, 21. Pressure sensor, 31. Flow sensor, 41.42. Channel, 43.44. Discharge nozzle, 45.46. Aquarium.

Claims (6)

A gas generator for supplying gas for improving water quality to one or more water tanks through an external pipe,
A gas generator,
A plurality of gas discharge ports connected via a gas flow path branched to the gas generating unit,
A discharge switching valve that is provided in the gas flow path and opens and closes the gas flow path for each of the gas discharge ports;
A control unit that controls opening and closing of each of the discharge switching valves so as to switch the gas discharge ports that discharge gas.   The gas generator according to claim 1, wherein the control unit sequentially controls an opening time for each of the discharge switching valves. The gas flow path is provided with a pressure sensor upstream of the discharge switching valve,
3. The gas generator according to claim 1, wherein the control unit controls an opening time of each of the discharge switching valves based on a value measured by the pressure sensor. 4. The gas flow path is provided with a flow rate sensor upstream of the discharge switching valve,
3. The gas generator according to claim 1, wherein the control unit controls an opening time of each of the discharge switching valves based on a value measured by the flow sensor. 4.   4. The gas generator according to claim 1, wherein the control unit controls an opening time of each of the discharge switching valves based on a flow rate characteristic of the gas generating unit based on a load pressure. 5.   The gas generator according to any one of claims 1 to 5, further comprising an operation unit configured to set a gas discharge amount to the water tank in the control unit.

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