JPS6335909B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a cooling water device for cooling seawater in a fishing tank of a fishing boat, and particularly to a cooling water device for a fishing boat suitable for cooling a plurality of fishing tanks of a small fishing boat.

In order to maintain the freshness of the sea caught at sea, it is necessary to keep the seawater in the fishing tank at a low temperature. Conventionally, for this purpose, a large amount of ice has been used, and as shown in FIGS. There was a chilled water system using a refrigeration cycle consisting of an evaporator 30 having an expansion valve type expansion device installed inside one of the fishing tanks 3. However, in the above method,
Even if there are multiple fishing tanks, only one evaporator is used to cool the seawater in each cycle, so in order to cool the seawater in at least one fishing tank, The operation of the refrigeration cycle will cool the seawater in all fishing tanks. This will also cool down the seawater in the fishing tank, which is not necessary, and if you try to solve this problem,
The drawback was that it required as many refrigeration cycles as there were fishing tanks, which not only caused waste but also increased costs.

An object of the present invention is to provide a cooling water device for a fishing boat that can selectively cool seawater in a necessary fishing tank among a plurality of fishing tanks.

The present invention installs an evaporator in each fishing tank, compares the temperature of seawater in each tank with a set cooling temperature, and controls a solenoid valve that determines the flow rate of refrigerant for each fishing tank. This makes it possible to selectively cool the seawater in the fishing tank as required.

Next, embodiments according to the present invention will be described in detail with reference to FIGS. 3 to 16. The fishing boat is comprised of an engine room 1, a wheelhouse 2, fishing tanks 3, 3', and the like.

The outline of the chilled water device according to the present invention will be explained with reference to FIGS. 3 and 4. A reciprocating refrigerant pipe (flexible hose) 41 that connects the compressor 10 driven by the engine 4 of the fishing boat, the condensing unit 20, and a plurality of evaporators 30, 30' provided in the fishing tanks 3, 3'. 42,4
Consists of 3, 43', 44, 44'.

Next, the refrigerant cycle will be explained using FIG. 5 and subsequent figures. The compressor 10 is belt driven by a fishing boat engine via a magnetic clutch 10a. The high-temperature, high-pressure gaseous refrigerant compressed by the compressor 10 flows into the condenser 21 from the high-pressure pipe 41 . Here capacitor 2
1 will be explained with reference to FIG. A capacitor coil 213 made of a salt water-resistant copper alloy tube or the like is formed in a reciprocating spiral shape, and has refrigerant inlets and outlets 211 and 212. This capacitor coil 213 is housed and both ends are sealed with side plates 215 through packings 214. It is formed by a cylindrical shell 216. Furthermore, the side plate 21
Seawater inlet/outlet 217 and 218 are provided in shell 216, respectively, and seawater is caused to flow through shell 216 by pump 22. The high-temperature, high-pressure liquid refrigerant that has flowed into the condenser 21 is cooled by seawater sent by the pump 22 and condensed into high-pressure liquid refrigerant.

The liquefied refrigerant is sent to the sight glass body 23. Here sight glass body 23 is the 9th
As shown in FIG. 10, it is comprised of pipes 232, 233, and 234 attached to a body 231 and communicating with each other, and a sight glass 235 attached to the upper surface of the body for observing the amount of refrigerant enclosed. Furthermore, the sight glass body 23 is equipped with a pressure switch 2, which is a safety device for disabling the start of the compressor 10 in the event of abnormal pressure in the refrigeration cycle.
36 is installed. pipes 233, 234
is connected to the solenoid valves 24 and 24', and the flow of refrigerant is turned on and off by opening and closing the solenoid valves 24 and 24'.
Turn off.

Expanders 25, 2 are connected to refrigerant pipes (flexible hoses) 43, 43' from solenoid valves 24, 24'.
5'. In this embodiment, a fixed orifice type expansion device and orifice tube assembly shown in FIG. 11 is used as the expander.

A capillary-shaped orifice tube 252 is fixed to the orifice tube assembly by passing through the center of an abacus-shaped spacer 251, and a strainer 253 made of wire mesh or the like is attached to cover the inlet end of this orifice tube 252. This spacer 251 has one end attached to the flexible hoses 42, 42', the other end of which is in contact with a connecting pipe 254 which is flared, and the other end which is in contact with an evaporator 30 (described later) which has a flared end. A union 255 and a nut 256 are used to airtightly connect them. Incidentally, this connecting pipe 254 penetrates the wall of the fishing tank 3, 3' and is fixed.
As mentioned above, the expanders 25, 25' are fixed to the inlets of the evaporators 30, 30' in the fishing tanks 3, 3'. The expander having the above structure has a very simple structure, and since it is fixed inside the salt water resistant connecting pipe 254 and the evaporator 30, the material can be easily selected and an inexpensive expander can be used.

The evaporators 30, 30' are made of salt water resistant copper alloy tubing. The shape is as shown in FIGS. 12 and 13 by forming a meandering pipe 31 into a planar shape, bending it into an L shape, and forming a bracket A32,
It is fixed with a bracket B33, and both ends of the pipe are flared to form an inlet pipe 34 and an outlet pipe 35. The L-shaped evaporators 30, 30' are mounted along the two walls of the fishing tanks 3, 3' using brackets A32 and B33. Connecting pipes penetrating the fishing tank wall are attached to the outlet pipes 35, 35' of the evaporators 30, 30' in almost the same way as described above, and refrigerant pipes (flexible hoses) 44, 4 are connected to the connecting pipes.
4', they are each connected to an accumulator 26 housed in the condensing unit 20.

As shown in FIG. 14, the accumulator 26 includes a U-shaped pipe 261, a desiccant 262, a body 263 made of a drawn copper alloy tube, a bracket 264 attached to the body 263, and a plurality of nipples into which refrigerant flows. A265, (the flexible hoses 44, 44' are connected to this nipple) and a nipple B2 attached to one end of the pipe 261.
It consists of 66. A small hole 261a for returning compressor oil coexisting with the refrigerant is formed near the bottom of the U-shaped pipe 261, and a balance port 261b is formed at the top. The accumulator 26 returns the gaseous refrigerant to the compressor 10 from the upper part of the accumulator, and also stores it as a liquid refrigerant to adjust the amount of refrigerant required depending on the usage status of the refrigerant cycle (change in the number of evaporators used, etc.). Furthermore, the compressor oil is returned to the compressor 10, and moisture contained in the refrigerant is removed by the desiccant 262.

In addition, the water cooling device of this embodiment includes the water cooling condenser 21, the pump 22, the sight glass body 23,
The solenoid valves 24, 24' and the accumulator 26 are fixed to a base 28 and covered with a cover 29 to form a condensing unit 20 (shown in FIGS. 7 and 8), and the chilled water system is installed on a fishing boat. is simplified.

The refrigerant cycle is completed by connecting the accumulator 26 and the compressor 10 through a refrigerant pipe (flexible hose) 42.

An electrical control device is required to operate a chilled water system consisting of the above refrigerant cycle. First about the control configuration of this embodiment
This will be explained with reference to FIG. 5 and FIG. 16. FIG. 15 shows the operation/display section of the control box 27 installed in the wheelhouse 2 or the like. FIG. 16 shows a diagram of the control device. The operation/display section of the control box 27 includes a power switch section 2 for turning off the power to the control device.
71. Fishing tank switch parts 272a, 272a' that select the fishing tanks 3, 3' to be cooled, volume switches 272b, 272b' that set the required seawater temperature for each of the fishing tanks 3, 3', and the temperature inside the fishing tank. Temperature display lamps 272c, 272 indicating that
c′ Switch 273 for changing the display of fishing tank seawater temperature Temperature display section 274 for displaying fishing tank seawater temperature
There is.

Further, temperature sensors 273a, 273a' that detect the water temperature of each fishing tank 3, 3' are installed in the fishing tank, and electrical signals from the temperature sensors 273a, 273a' are sent to the widening parts 273b, 273b'. The comparing portions 273c and 273c' compare the temperature with the temperature set by the volume switches 272b and 272b', and output a signal to open and close the solenoid valves 24 and 24'.

Furthermore, the signals from each comparison section are sent to the OR operation section at 27
7 input, and when there is an output signal from at least one comparison section 276, 276',
Magnetic clutch 10a that drives compressor 10 and pump 2 for water-cooled condenser 21
2. The seawater temperature in the fishing tanks 3 and 3' is displayed using temperature sensors 273a and 273.
a' signal is amplified by amplifying parts 273b, 273b',
Select the fishing tank alternately with the changeover switch 273,
This signal is converted into a digital signal by an A/D converter 274a, amplified by an amplifying section 274b, and then digitally displayed on a display section 274.

When a fixed orifice type is used as an expander in a refrigerant cycle, control of refrigerant flow rate with respect to load fluctuations is generally reduced compared to an expansion valve. However, fishing boat engine speed,
In other words, the compressor's rotational speed has very little fluctuation, and since the seawater in the fishing tank is used for cooling, the load fluctuations are also small. A fixed orifice type with features such as being incorporated into the orifice is advantageous.

In the present invention, an evaporator is arranged in each of a plurality of fishing tanks, and a solenoid valve is installed in each fishing tank to determine the flow rate of the refrigerant by comparing the seawater temperature in each fishing tank with a set cooling temperature. This control has the effect of cooling the seawater in the fishing tank as much as necessary.

[Brief explanation of the drawing]

FIGS. 1 and 2 are explanatory diagrams showing how a conventional cooling water device for a fishing boat is installed on a fishing boat, and FIGS. 3 and 4 are explanatory diagrams showing an embodiment in which a cooling water device according to the present invention is installed on a fishing boat. It is. FIG. 5 is a system diagram showing the connection of equipment in an embodiment of the chilled water apparatus according to the present invention. FIG. 6 is a perspective view showing an embodiment of a water-cooled condenser according to the present invention, FIGS. 7 and 8 are plan views and side views showing an embodiment of a condensing unit according to the present invention, and FIG. , FIG. 10 is a plan view of the sight glass body according to the present invention, and FIG. 10 is a sectional view taken along the line A-A in FIG.
2 and 13 are schematic plan and side views showing one embodiment of the evaporator according to the present invention, and FIG.
The figure is a half sectional view showing an embodiment of the accumulator according to the present invention. FIG. 15 shows an embodiment of the panel surface of a control box according to the invention, and FIG. 16 shows a diagram showing an embodiment of the electrical control according to the invention. 3... Fishing tank, 4... Engine, 10... Compressor, 20... Water-cooled condenser, 30, 30'... Evaporator.

Claims (1)

[Claims] 1. An evaporator for lowering the temperature of seawater in the fishing tank, a pump for sending seawater to the evaporator, and a compressor for compressing the refrigerant flowing from the evaporator and sending the refrigerant to the condenser. , the condenser for releasing the heat taken by the evaporator;
A cooling water system for a fishing boat having one refrigeration cycle comprising an expander for expanding refrigerant flowing from the condenser and a controller for adjusting the flow rate of the refrigerant, wherein the controller measures the temperature of seawater. a means for comparing a resistance value of a heat-sensitive element for setting a cooling temperature with a resistance value for setting a cooling temperature; A chilled water device for a fishing boat, characterized in that the vessels are installed in each of a plurality of fishing tanks, and are selectively operated by the controller.