JPH04131026A - Oxygen-supplying apparatus for culture on sea surface - Google Patents

Abstract

PURPOSE:To provide the subject apparatus driving a diaphragm pump with compressed air, introducing compressed air by the head applied to a seawater ejection piping and continuously dispersing a large quantity of air in the form of fine bubbles. CONSTITUTION:Seawater is introduced into a diaphragm pump 9 through a suction pipe 12 provided with a strainer 11. Compressed air supplied from a compressor 1 driven by an engine 2 is introduced through a filter 3, a throttle valve 8 and a piping 6 into the diaphragm pump 9 to drive the pump. Separately, a part of the compressed air is passed through a throttle valve 7 and a down pipe of a vertical U-shaped pipe 13' and exhausted from the lower end of an air piping 6 in a riser. Seawater is intermittently ejected from the diaphragm 9 by the head difference H.

Description

[Detailed description of the invention] [Industrial application field] The present invention relates to an oxygen supply device for marine culture.

[Conventional technology]

As a means of supplying oxygen to a sea-surface tank, for example, as shown in the side view of Figure 4, sea water is stirred by a water wheel 19 attached to the sea surface and partially immersed in sea water, or as shown in Figure 5, a sea-water tank is stirred with water. Although there are known methods such as using a compressor 1 installed in the seawater to directly send air through an air diffuser 116 installed vertically into the seawater, none of these methods have been sufficiently effective.

[Spy H that invention tries to solve]

In the case of the water turbine shown in Figure 4, although it is effective near the water surface, it is almost ineffective in a tank up to 8 m deep, and the means using the aeration pipe shown in Figure 5 discharges air bubbles. is so large that the amount that dissolves into seawater is only about 1/300 of the amount that returns to the atmosphere, making it inefficient, making it unrealistic to fill a tank with air bubbles to supply the required amount of oxygen. This is because a large amount of air is required.

In addition, in order to enable continuous operation of the oxygen supply device,
It is necessary to have a function that can automatically adjust the discharge amount so that only air or seawater is not sent out.

The present invention was proposed in view of the above circumstances, and an object of the present invention is to provide an oxygen supply device for marine culture that continuously and uniformly disperses a large amount of air into seawater as fine bubbles.

[Means to solve the problem]

To this end, the present invention provides a compressor for supplying compressed air, a diaphragm pump that is driven by the compressed air at the outlet of the compressor, sucks in seawater and discharges it intermittently, and a diaphragm pump that pumps the seawater discharged from the diaphragm pump. A pressurized discharge pipe that leads to an aeration pipe inside the pipe, and an air pipe that injects a part of the compressed air from the compressor outlet through a throttle valve in the middle of the pressurized discharge pipe. It is characterized in that the injection port to the pipe is provided below the seawater inlet of the diaphragm pump.

[Effect]

According to such a configuration, the pressure inside the pressurized discharge vibrator is maintained by causing a pressure drop when seawater is discharged by the throttle valve of each cage, and by continuing to inject compressed air and seawater thereto.

Diaphragm pumps stop when the discharge side pressure reaches the same pressure as the compressed air of the drive source, and start operating when the discharge side pressure decreases, and the spool switching action allows for intermittent operation.
In other words, it has a characteristic of repeatedly discharging and stopping, and by utilizing this characteristic, compressed air is constantly injected into the pressurized discharge pipe using an inlet and a diaphragm pump is used to inject pressurized water.

Due to the intermittent operation of the diaphragm pump, the injection of compressed air is stopped while seawater is being discharged, and a difference between the turbid water and air inlets of the pressurizing pipe is made so that compressed air is injected only when the seawater is stopped. This allows the diaphragm pump to discharge at a high pressure by the head difference between the discharge ports, and while the discharge is stopped, the compressed air side is at high pressure, so compressed air and seawater are alternately injected under pressure in accordance with the operation of the diaphragm pump.

The amount of compressed air to be injected is adjusted by a throttle valve, and the throttle valve maintains the pressure of the compressed air source by passing air pressure when there is only air inside the pressurized discharge vibrator, so that the diaphragm pump can operate normally. do.

In this way, it is possible to continuously pressurize and mix seawater and air, supplying a large amount of effective fine air bubbles to each tank, and the air bubbles that spread inside the tank dissolve into the seawater again. This increases the oxygen concentration in seawater.

Embodiment] An embodiment in which the present invention is applied to a marine vessel will be explained with reference to the drawings. Fig. 1 is an overall side view of the same, Fig. 2 is an enlarged view of the main part indicated by the chain line frame in Fig. FIG. 3 is a longitudinal sectional view showing the diaphragm pump of FIG. 2.

First, in FIG. 1, reference numeral 17 indicates a plurality of cages, and air bubble-containing seawater is supplied from an oxygen supply device 18 (to be described later) to a horizontal diffuser pipe 16 attached along the bottom of each cage 17 through a distribution pipe 14. .

10 is a silencer; 15 is an orifice inserted into each distribution pipe 14;

Next, to explain the structure of the oxygen supply device 18, in FIG.
After being pressurized by a compressor 1 driven by a compressor 1, dust is removed by a filter 3, and the pressure is adjusted to the working pressure by a pressure reducing valve 4, some of the air is mixed with lubricating oil by a lubricator 5, and then a throttle valve 8 is applied. via diaphragm pump 9
will be introduced in

The remaining air is taken from air piping 6. Oil removal filter 3. The vertical U-shaped pipe section 13 of the diaphragm pump 9 passes through the throttle valve 7.
Air is discharged from the lower end of the air pipe 6 extending vertically downward into the falling part of the vertical U-shaped pipe into the rising pipe part of the vertical U-shaped pipe part.

12 is a suction pipe that introduces seawater into the diaphragm pump 9 through the strainer 11.

Here, in the diaphragm pump 9, as shown in FIG. 3, diaphragms are arranged at both ends of a horizontal spool 9-1, and when air is sent to the air chamber a,
moves to the left, seawater in the left ventricle is discharged through the outlet 9-2, and at the same time seawater is sucked into the right ventricle, and the spool 9-1
When it reaches the end of its stroke, the port switches, air is sent to the right ventricle, and the spool moves to the right, allowing seawater in the right ventricle to be discharged and external seawater to be introduced into the left ventricle at the same time. It has become.

This type of diaphragm pump 9 has a characteristic that it stops discharging when the seawater pressure on the discharge side exceeds the supply air pressure, and the discharge amount increases as the pressure on the discharge side decreases.

In such an oxygen supply device 18, as shown in FIG. 2, the diaphragm pump 9 has a margin in its discharge capacity corresponding to the head difference H between the discharge pipes 13, so that the diaphragm pump 9 can overcome the injection of compressed air and increase the discharge capacity of the discharge pipes 13. Discharges seawater inside.

Here, due to its principle structure, the diaphragm pump 9 alternately discharges seawater and does not discharge seawater due to the action of the spool, so the seawater pressure in the discharge pipe decreases when seawater is not discharged. Compressed air is injected into the discharge pipe 13, and the amount of this injection corresponds to the amount of seawater that has flowed into the tank 17.

By automatically injecting seawater and air alternately into the discharge pipe in this way, the two are mixed under pressure, and oxygen is well dissolved into the seawater while passing through the long discharge pipe 13.

Here, it is necessary to always maintain seawater in the discharge pipe 13, so if compressed air flows directly into the discharge pipe 13, all the turbid water will be pushed out. Regulates the amount of compressed air flowing in.

Note that when the compressed air flows through the throttle valve 7, a pressure loss occurs due to the throttle valve, and even if the seawater pressure in the discharge pipe decreases, the pressure of the compressed air does not decrease due to the pressure loss. That is, the diaphragm pump 9 operates normally even if the discharge pipe 13 is filled with air, and seawater is continuously supplied into the discharge pipe.

According to such a device, it is possible to continuously mix seawater and air under pressure, and it is possible to supply a large amount of beneficial fine air bubbles to each cage.

According to such an oxygen supply device, it is possible to mix and pressurize seawater and air continuously, automatically, and with a very simple configuration. In addition, in this device, when seawater and air are mixed under pressure, a good amount of air is trapped in the seawater, and a large amount of fine air bubbles are generated from the aeration pipe, increasing the oxygen concentration in the surrounding area.

〔Effect of the invention〕

In short, according to the present invention, it is driven by a compressor for supplying compressed air and compressed air at the outlet of the compressor,
A diaphragm pump that sucks in seawater and discharges it intermittently, a pressurized discharge pipe that guides the seawater discharged from the diaphragm pump to an aeration pipe in the tank, and a compressor outlet in the middle of the pressurized discharge pipe. It is equipped with an air pipe for injecting a portion of compressed air through a throttle valve, and the inlet of the air pipe to the pressurized discharge pipe is provided below the seawater inlet of the diaphragm pump. The present invention is extremely useful industrially because it provides an oxygen supply device for marine culture that continuously and uniformly disperses air in seawater as fine bubbles.

[Brief explanation of drawings]

Fig. 1 is an overall side view showing one embodiment of the present invention, Fig. 2 is an enlarged view of the main part shown in the dashed line frame in Fig. 1, and Fig. 3 is a longitudinal sectional view showing the diaphragm pump of Fig. 2. be. FIG. 4 and FIG. 5 are side views showing known water wheel type and aeration pipe type oxygen supply devices for cages, respectively. 1... Compressor 2... Engine, 3...
Filter, 4... Pressure reducing valve, 5... Lubricator 6... Air piping, 7... Throttle valve, 8... Throttle valve,
9...Diaphragm pump, 10...Silencer 11...Strainer-12...Suction pipe, 13...
...Discharge pipe, 14... Distribution pipe, 15... Orifice, 16... Diffusion pipe, 17... Fish tank, 18
...Oxygen supply device, Factor 4 Figure/9 Figure-\/b

Claims (1)

[Claims] A compressor for supplying compressed air, a diaphragm pump that is driven by the compressed air at the outlet of the compressor, sucks in seawater and discharges it intermittently, and guides the discharged seawater from the diaphragm pump to the aeration pipe inside the cage. A pressurized discharge pipe, and an air pipe in the middle of the pressurized discharge pipe for injecting a part of the compressed air from the outlet of the compressor through a throttle valve, and an inlet of the air pipe to the pressurized discharge pipe is provided. An oxygen supply device for marine aquaculture, characterized in that it is provided below a seawater inlet of a diaphragm pump.