JP2530051Y2 - Circulating seawater cooling system - Google Patents

Description

[Detailed description of the invention]

[0001]

The present invention is applied to a small fishing boat and the like, and is a recirculating system for maintaining the freshness of fish until the seawater in the fish hold is cooled to a desired temperature and the fish caught is landed. It relates to a seawater cooling device.

[0002]

2. Description of the Related Art When fishing on a small fishing boat, the fish caught is temporarily stored in a fish hold provided at the bottom of the boat and transported to a destination such as a landing site. In order to maintain the seawater temperature, it is necessary to cool the seawater temperature in the fish hold to the same temperature as the seawater inhabited by fish, so such a small fishing boat is equipped with a seawater cooling device.

[0003] As a conventional seawater cooling device, a circulation type cooling device for cooling by an evaporator constituting a refrigeration cycle while sucking and circulating seawater in a fish hold is widely used. The apparatus has a seawater circulation system in which seawater in the fish hold circulates, a refrigerant circulation system in which refrigerant such as Freon gas circulates, and a cooling water circulation system for cooling the refrigerant in the refrigerant circulation system. The seawater circulation system is a closed circuit in which seawater in a fish hold is sucked by a pump, guided to an evaporator of a refrigerant circulation system to exchange heat, and then returned to the fish hold again.

The refrigerant circulation system is a closed circuit mainly composed of a compressor, a condenser, a liquid tank, an expansion valve, and an evaporator. The state change of the refrigerant in the refrigerant circulation system and the cooling action of seawater are as follows. Done. That is, the refrigerant sucked into the compressor in the state of superheated steam is adiabatically compressed by the compressor, becomes a high-temperature and high-pressure gaseous refrigerant, and is guided to the condenser, where it releases heat to become a medium-temperature and high-pressure liquid refrigerant. . Then, the liquid refrigerant is adiabatically expanded by passing through the expansion valve to become a gas-liquid mixed refrigerant, and then guided to the evaporator to perform heat exchange with the above-described seawater, and continues to expand under constant pressure while being vaporized, It becomes superheated steam and is sucked into the compressor again.
On the other hand, cooling water is sucked into the condenser of the refrigerant circulation system by a pump, and performs the cooling operation of the refrigerant described above.

[0005]

However, the conventional circulating seawater cooling system is designed to provide a seawater circulating system, a refrigerant circulating system, when the refrigerant pressure or the refrigerant temperature rises or falls abnormally.
Since the entire cooling water circulation system is configured to be stopped, there is a problem that if an abnormal situation occurs during the fishing operation, there is no method for confirming the cause of the abnormality, and a quick response cannot be taken. Regarding the start-up operation, the seawater circulation pump, compressor and cooling water circulation pump were operated separately, which not only complicates the operation but also, for example, operates the compressor before operating the cooling water circulation pump. If the starting procedure is erroneous as in the case where the cooling device is operated, there is a possibility that the cause of the failure of the cooling device may be induced. The present invention has been made in view of such a problem of the related art, and has as its first object to evoke the cause of an abnormality occurring in a cooling device and to promptly respond to the problem, It is a second object to simplify the operation and suppress the cause of the failure.

[0006]

According to the present invention, there is provided a seawater cooling apparatus for cooling seawater in a fish hold provided on a fishing boat to a desired temperature. , A seawater circulation system that guides the refrigerant to the evaporator and returns it to the fish hold again, a compressor that adiabatically compresses the refrigerant, a condenser that takes heat from the refrigerant to condense it, a liquid tank that stores the refrigerant, and adiabatic expansion of the liquid refrigerant An expansion valve for causing the refrigerant to circulate, and a refrigerant circulation system having an evaporator for performing heat exchange with the seawater through circulation of the refrigerant, and a cooling water circulation system for supplying cooling water to the condenser by a pump, A water temperature sensor for detecting a seawater temperature in the seawater circulation system, a refrigerant temperature sensor for detecting a refrigerant temperature at an evaporator inlet side in the refrigerant circulation system, and the refrigerant circulation A pressure switch for detecting a refrigerant pressure between a condenser and an expansion valve in the inside, a display unit for displaying a seawater temperature and a content of an abnormality while inputting a desired seawater temperature value and a refrigerant temperature value in advance, and a buzzer for issuing an abnormality alarm And control for instructing the control panel to output whether the data detected by the water temperature sensor, the refrigerant temperature sensor, and the pressure switch are within a predetermined range, and to output different displays. Means for circulating seawater.
It is preferable that the control means starts the compressor after confirming that both the seawater circulation system pump and the cooling water circulation system pump have been started.

[0007]

In order to start the circulation type seawater cooling device of the present invention having the above configuration, first, it is necessary to confirm that both the seawater circulation system pump and the cooling water circulation system pump have been started, and then to check the state of the compressor. To start. This not only simplifies the starting operation, but also suppresses the cause of the failure. Further, the control means performs a comparison operation on the data detected by the water temperature sensor, the refrigerant temperature sensor, and the pressure switch with respect to a preset reference value, and detects a low temperature abnormality and a high temperature abnormality of the seawater temperature in the fish hold, Display abnormalities and abnormalities of high temperature, and both abnormalities of seawater temperature and refrigerant temperature on the control panel, and alert the operator with a buzzer. Can be.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below with reference to the drawings. 1 is an apparatus configuration diagram showing an embodiment of the present invention, FIG. 2 is an exploded perspective view showing an evaporator and a capacitor of the embodiment, FIG. 3 is a sectional view taken along line AA in FIG.
FIG. 4 is a front view showing a control panel of the embodiment, FIG. 5 is a main flow chart showing a control procedure in the control means of the embodiment, FIG. 6 is a subroutine showing a procedure of displaying the temperature in the bath of FIG. 5 is a subroutine showing the procedure of the temperature control of FIG. 5, FIG. 8 is a subroutine showing the procedure of the temperature setting mode of FIG. 5, FIG. 9 is a subroutine showing the procedure of the antifreeze mode of FIG. 5, and FIG. FIG. 11 is a subroutine showing a control procedure, and FIG. 11 is a subroutine showing a buzzer control procedure of FIG.

First, the configuration of the circulation type seawater cooling device of the present embodiment will be described. As shown in FIG. 1, the circulation type seawater cooling device of the present embodiment has a seawater circulation system 4 for guiding seawater in the fish hold 1 to an evaporator 3 described later. It is sucked by the pump 2 through the filter 19. Although not shown, the pump 2 is operated by electric power or power from a drive source (engine or the like) of a fishing boat. The filter 19 is for protecting the pump 2 from foreign substances in the fish hold 1. A water temperature sensor 12 for detecting the temperature of seawater circulating in the pipe is provided in the middle of the pipe 20 of the seawater circulation system 4, and the detected data is connected to a control unit 18 described later. . The operation / stop signal of the pump 2 is also input to the control means 18, while the operation / stop signal is sent from the control means 18.
They are connected so that a stop command signal is output.

The refrigerant circulating system 9 of this embodiment includes a compressor 5, a condenser 6, a liquid tank 7, an expansion valve 8, and an evaporator 3 as main components, and forms a closed circuit by a refrigerant pipe 21 as shown in FIG. doing. The driving force from the engine is transmitted to the compressor 5 via a clutch using the engine of the fishing boat as a driving source. The operation / stop signal of the compressor 5 is output to the control means 18 and connected so that an operation / stop command signal is input from the control means 18.

The condenser 6 removes heat from the high-temperature and high-pressure gaseous refrigerant and changes the state into a medium-temperature and high-pressure liquid refrigerant. Make up the parts. As shown in FIG. 2, the specific structure of the condenser 6 is a double-pipe structure in which a titanium pipe 24 is inserted into a rubber hose 23. And titanium pipe 24
Inside (indicated by “B” in FIG. 3), a refrigerant flows, and between the titanium pipe 24 and the rubber hose 23 (indicated by “C” in FIG. 3), seawater sucked from the sea flows. . In FIG. 1, "25" is a filter of the cooling water circulation system 11,
The pump 10 is protected from foreign substances in the sea. In addition, pump 1
The start / stop signal of 0 is input to the control means 18, while
The control means 18 is connected so as to output an operation / stop command signal.

A liquid tank 7 is provided downstream of the condenser 6 for storing a liquid refrigerant which is adjusted by fluctuations in the heat load of the refrigerant circulating system 9 to separate gas and liquid and to remove foreign substances and moisture in the refrigerant. And takes out only the liquid refrigerant. The liquid tank 7 is provided with a dual switch type pressure switch 14. When the refrigerant pressure in the refrigerant circulation system 9 becomes low or high, the switch is turned off, and this signal is sent to the control means 18. Output. The refrigerant pressure becomes low pressure abnormal when the amount of refrigerant in the refrigerant circulation system decreases, and the refrigerant pressure becomes high pressure abnormality when the capacity of the condenser of the refrigerant circulation system becomes insufficient.

An expansion valve 8 connected downstream of the liquid tank 7 adiabatically expands the liquid refrigerant into a gas-liquid mixed refrigerant. Downstream of the expansion valve 8 is a refrigerant circulation system 9.
A refrigerant temperature sensor 13 for detecting the temperature of the refrigerant inside is installed, and the detection data is output to the control means 18. The evaporator 3 of the refrigerant circulation system 9 performs heat exchange between the seawater in the fish hold 1 and the refrigerant, and employs a double-pipe structure like the condenser 6 described above. That is, as shown in FIG. 2, a titanium pipe 24 is inserted into a rubber hose 23, and a refrigerant flows through the titanium pipe 24 (indicated by "B" in FIG. 3).
The seawater in the fish hold 1 circulates between the rubber hose 23 (indicated by “C” in FIG. 3).

The state change of the refrigerant and the cooling operation of the seawater in the refrigerant circulation system 9 configured as described above are performed as follows. That is, in the state of superheated steam, the compressor 5
Is adiabatically compressed by the compressor 5 to become a high-temperature and high-pressure gaseous refrigerant and guided to the condenser 6, where it releases heat to the cooling seawater 22 to become a medium-temperature and high-pressure liquid refrigerant. Next, this liquid refrigerant is adiabatically expanded by passing through the expansion valve 8 to become a gas-liquid mixed refrigerant, and then guided to the evaporator 3 to perform heat exchange with seawater in the fish hold 1 and evaporate, etc. The pressure expansion is continued, and the superheated steam is sucked into the compressor 5 again.

The control means 18 of this embodiment comprises the above-described water temperature sensor 12 (seawater temperature), pressure switch 14 (refrigerant pressure), refrigerant temperature sensor 13 (refrigerant temperature), and operation of the two pumps 2, 10 and the compressor 5. / Stop signals are input to perform temperature display in the tank, control the temperature in the tank, and alert an abnormal state. FIG. 4 is a front view showing the control panel 17 according to the present embodiment. The main power ON / OFF switch 25 , the temperature setting value setting switch 26 and the setting value up / down button 27, the temperature and the temperature in the chamber A set value display section 28, a fish hold temperature display monitor 29, and a set temperature display monitor 30 are provided on the front of the panel. Although not shown, the control panel 17 is provided with an alarm buzzer 16 for calling out an abnormality under predetermined conditions.

Next, a specific control procedure of the control means 18 will be described with reference to flowcharts shown in FIGS. First, as shown in FIG. 5, the buzzer sounds when the initial setting is performed, and when the main power switch is turned on, the alarm buzzer is turned off and the apparatus enters a standby state (steps 1 to 4).

[0017] Next vessel temperature control (FIG. 6), when not subjected to temperature setting operation, i.e. when the setting flag is OFF, the seawater temperature in Sakana艙1 detected by the water temperature sensor 12 is -20 If the temperature is 40 ° C., the temperature is digitally displayed on the display unit 28 of the control panel 17 and the water temperature buzzer flag is turned off (steps 16 to 18). At this time, if the seawater temperature in the fish hold 1 is a high temperature of 40 ° C. or more, a display for calling out the abnormal content “EH” is displayed on the display unit 28 of the control panel 17 and at the same time, the water temperature buzzer is used. flag
To set a water temperature error flag (steps 17 and 2).
0). When the temperature of the seawater in the fish hold 1 is a low temperature of −20 ° C. or less, a display for calling out the abnormal content “EL” is displayed on the display unit 28 of the control panel 17 and at the same time, the water temperature buzzer is sounded. A water temperature error flag is set by setting a flag (steps 18 and 21).

Next, when the refrigerant temperature in the refrigerant circulation system 9 detected by the refrigerant temperature sensor 13 is in the range of −20 to 40 ° C., the display section 28 of the control panel 17 displays the temperature inside the fish hold 1. Are continuously displayed (steps 22 to 25), and when the refrigerant temperature is a high temperature of 40 ° C. or higher or a low temperature of −20 ° C. or lower, “PH” and “PL” are displayed on the display unit 28 of the control panel 17, respectively. Is displayed, and at the same time, the refrigerant pipe buzzer flag is set and the refrigerant pipe flag is set (steps 23 and 26, step 2).
4, 27). At this time, when the water temperature in the fish hold 1 is high temperature of 40 ° C. or higher or low temperature of −20 ° C. or lower, it is necessary to display two abnormalities, that is, a water temperature abnormality and a refrigerant temperature abnormality. 17 display unit 2
8 is displayed as "EEE" (step 2).
8-31). Thereby, it is possible to evoke the operator or the like three kinds of abnormal contents, that is, when only the seawater temperature in the fish hold 1 is abnormal, when only the refrigerant temperature is abnormal, and when both temperatures are abnormal. .

Temperature control (FIG. 7) In a state in which the pump 2 of the seawater circulation system 4 in the fish hold 1 and the circulation pump 10 for cooling the condenser 6 are not operating, first, one of the pumps is operated, and (5 seconds in this embodiment), the other pump is activated (steps 32 to 36), and after a predetermined interval (5 seconds in this embodiment), the pressure switch flag is reset. Then, the ON / OFF state of a freeze flag described later is checked (step 3).
9, 40). At this time, the pressure switch flag is in the OFF state (refrigerant pressure is normal), the freeze flag is in the OFF state (refrigerant temperature is 0 ° C. or higher), and the seawater temperature in the fish hold 1 is higher than the set temperature. If the temperature is lower than −0.3 ° C., the compressor 5 is operated to circulate the refrigerant in the refrigerant circulation system 9 and at the same time a cooling flag is set (step 3).
9-43, steps 41, 44, 45). In addition, fish hold 1
If the temperature of the seawater is lower than −0.3 ° C. with respect to the set temperature, it is not necessary to operate the cooling device of this embodiment, so that a stop signal is output to the compressor 5 and the cooling flag is turned off at the same time ( Steps 46 and 47). Further, if either the water temperature error flag or the refrigerant pipe error flag is ON, a stop signal is output to the compressor 5 and the refrigerant circulation system 9 is not operated until the abnormality is cleared (step 48).

When the temperature setting button (26 ) of the control panel 17 is pressed while the temperature setting mode (FIG. 8) setting flag is OFF, the current setting value is displayed on the display unit 28 and at the same time the setting flag is raised (FIG. 8). Steps 49-51). If the user wants to change the current set value, the user presses one of the up / down buttons 27 on the control panel 17 to select a desired set value (step 52).
~ 55). When the desired setting value is displayed on the display unit 28 and the setting button 26 is pressed again, the setting flag is turned off and a new setting value is stored. However, even if the setting button 26 is not pressed, the up / down button 27 The setting flag is automatically turned off five seconds after the button is pressed (steps 55 to 58).

Freeze Prevention Mode (FIG. 9) When the refrigerant temperature in the refrigerant circulation system 9 is abnormally low, it is necessary to prevent the evaporator 3 and other components constituting the circulation system 9 from freezing. In this embodiment, when the refrigerant temperature detected by the refrigerant temperature sensor 13 is a low temperature of −15 ° C. or lower, a freeze flag is set and a command signal for stopping the compressor 5 is output (step 59).
To 61) to prevent freezing. further,
Once the freeze flag is turned on, the compressor 5 is not operated until the refrigerant temperature rises to 0 ° C. or higher (step 62).
~ 63).

Pressure switch control (FIG. 10) The pressure switch 14 attached to the liquid tank 7 of the refrigerant circulation system 9 is ON when the refrigerant pressure is steady as described above, and this signal is sent to the control means 18 Output to However, if the refrigerant pressure decreases or increases for some reason and the pressure falls outside a predetermined range, the pressure switch 14 is turned off, thereby setting the pressure switch flag, stopping the compressor 5 at the same time, and further sounding the pressure switch buzzer. The occurrence is called out (steps 64-66).

Buzzer control (FIG. 11) If any one of the water temperature buzzer flag , the refrigerant pipe buzzer flag , and the pressure switch buzzer flag is ON, the buzzer continues to sound (steps 67 and 69), and all these buzzers are turned OFF. Sometimes stop the buzzer (Step 6
8).

As described above, according to the circulating seawater cooling device of the present embodiment, when an abnormality occurs in the cooling device, the cause can be raised and prompt response can be made.
That is, the low and high temperature abnormalities of seawater temperature in fish hold 1,
A case where both the low temperature abnormality and the high temperature abnormality of the refrigerant temperature and the abnormality of both the seawater temperature and the refrigerant temperature can be displayed on the control panel 17, and the buzzer 16 can alert the operator. Further, when starting the cooling device of the present embodiment, the compressor 5 of the refrigerant circulation system 9 is operated after confirming the operation state of the pump 2 and the cooling water pump 10 of the seawater circulation system 4. In addition to simplifying the operation, the cause of the failure can be suppressed.

[0025]

As described above, according to the present invention, the seawater temperature in the fish hold is low and high, the refrigerant temperature is low and high, and both the seawater and refrigerant temperatures are abnormal. Can be displayed in the control panel,
In addition, since the buzzer can alert the worker, the cause can be raised and prompt action can be taken. Furthermore, when starting the cooling device of the present invention,
Since the compressor of the refrigerant circulation system is operated after confirming the operation state of the seawater circulation system pump and the cooling water pump, not only the operation is simplified, but also the cause of failure can be suppressed. .

[Brief description of the drawings]

FIG. 1 is an apparatus configuration diagram showing an embodiment of the present invention.

FIG. 2 is an exploded perspective view showing an evaporator and a condenser according to the embodiment.

FIG. 3 is a sectional view taken along line AA in FIG.

FIG. 4 is a front view showing a control panel of the embodiment.

FIG. 5 is a main flowchart showing a control procedure in a control unit of the embodiment.

FIG. 6 is a subroutine showing a procedure for displaying the temperature in the bath in FIG. 5;

FIG. 7 is a subroutine showing a procedure of temperature control in FIG.

FIG. 8 is a subroutine showing a procedure of a temperature setting mode of FIG.

FIG. 9 is a subroutine showing the procedure of the freeze prevention mode of FIG.

FIG. 10 is a subroutine showing a procedure of pressure switch control of FIG.

FIG. 11 is a subroutine showing a procedure of the buzzer control of FIG.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... fish hold, 2 ... seawater circulation system pump, 3 ... evaporator, 4 ... seawater circulation system, 5 ... compressor, 6 ... condenser, 7 ... liquid tank, 8 ... expansion valve, 9 ... refrigerant circulation system, 10 ... cooling Pump for water circulation system, 11: Cooling water circulation system (11), 12: Water temperature sensor, 13: Refrigerant temperature sensor, 14: Pressure switch, 28 : Display unit, 16: Buzzer, 17: Control panel, 18: Control means.

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Yutaka Tajima 5-24-15 Minamidai, Nakano-ku, Tokyo Calsonic Inside (72) Inventor Mitsuru Iwasaki 5-24-15 Minamidai, Nakano-ku, Tokyo Cal Sonic Corporation

Claims (2)

(57) [Scope of request for utility model registration] A seawater cooling device for cooling seawater in a fish hold (1) provided on a fishing boat to a desired temperature, wherein the sea water in the fish hold (1) is sucked by a pump (2). A seawater circulation system (4) that guides the evaporator (3) back into the fish hold (1), a compressor (5) that adiabatically compresses the refrigerant, a condenser (6) that deprives the refrigerant of heat and condenses it, and stores the refrigerant A liquid tank (7), an expansion valve (8) that adiabatically expands the liquid refrigerant,
A refrigerant circulation system (9) having an evaporator (3) for exchanging heat with the seawater through which the refrigerant flows, and a cooling water circulation system (11) for supplying cooling water to the condenser (6) by a pump (10). A water temperature sensor for detecting a temperature of seawater in the seawater circulation system (4).
(12), an evaporator (3) in the refrigerant circulation system (9), a refrigerant temperature sensor (13) for detecting a refrigerant temperature at an inlet side, a condenser (6) in the refrigerant circulation system (9), and an expansion valve. (8) a pressure switch (14) for detecting a refrigerant pressure, a display unit (28) for inputting a desired seawater temperature value and a refrigerant temperature value in advance and displaying the seawater temperature and the content of the abnormality, and an abnormality alarm. Buzzer emitting
(16), a water temperature sensor (12), a refrigerant temperature sensor (13), and a pressure switch (1).
And a control means (18) for instructing the control panel (17) to determine whether the data detected by 4) is within a predetermined range and to output different displays. Circulating seawater cooling system. 2. The seawater circulation system according to claim 2, wherein:
2. The circulating seawater according to claim 1, wherein the compressor (5) is started after confirming that both pumps (2) and (10) of the cooling water circulation system (11) have been started. Cooling system.