JP2810188B2 - Refrigerator control mechanism - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (a) Industrial application field The present invention uses seawater in Uokura as an indirect refrigerant to lower the temperature while passing through the evaporator of a refrigerator, and to make the fish in Uokura 0 ° C.
The present invention relates to a refrigerating machine control mechanism for preserving near-freezing temperatures and maintaining freshness.

(B) Conventional technology Conventionally, a mechanism for controlling the capacity of a compression refrigeration apparatus has been known.

For example, as disclosed in Japanese Patent Publication No. 50-12143.

In the prior art, a bypass passage provided with an opening / closing solenoid valve is provided, and an electromagnetic flow control valve is separately arranged between the evaporator and the compressor. The technology for setting the temperature is disclosed.

Further, in the related art, the temperature of the indirect refrigerant cooled by the evaporator is controlled by controlling the temperature of the refrigerant to be constant.

On the other hand, in the present invention, the temperature of the indirect refrigerant that exchanges heat in the evaporator is not controlled by controlling the temperature of the refrigerant by using the electromagnetic valve for opening and closing the bypass passage in combination with the electromagnetic flow control valve. Settled temperature ”.

In addition to directly controlling the temperature of the indirect refrigerant, it is also possible to further advance and automatically change the "target temperature" of the "outlet temperature" of the indirect refrigerant to further improve the control stability. It is.

(C) Problems to be Solved by the Invention The problem to be solved by the present invention is to transport fresh fish immediately after landing on a fishing boat to a port while maintaining the freshness as much as possible. Only a small number of fish can be transported in order to transport them alive.

The present invention relates to a control mechanism of a refrigerator for cooling and transporting landed fresh fish in a narrow temperature range around 0 ° C., generally called ice temperature.

In particular, it is necessary to converge the seawater in Uokura used as an indirect refrigerant to a narrow ice temperature region as close to 0 ° C. as possible. If the temperature of the refrigerant is controlled, it is difficult to converge the temperature in a narrow temperature range such as the ice temperature.

In the present invention, the solenoid valve 1 for opening and closing the bypass passage and the electromagnetic flow control valve 2 are used together, and the difference between the "inlet temperature" and the "set temperature" of the indirect refrigerant or the "target temperature" and the "set temperature" By judging the difference, the "set temperature" is converged as quickly and stably as possible.

In the invention of claim (2), the electromagnetic flow control valve is eliminated, and the opening and closing of the bypass passage opening / closing solenoid valve and the ON / OFF of the compressor are used in combination. Temperature "and stable control.

In addition, in order to detect the frozen state of the indirect refrigerant, which is the most frequent problem in the refrigerator, as quickly as possible, and to operate the “freeze release mechanism”, a flow sensor for detecting the flow rate of the indirect refrigerant is provided. Then, if it is detected that the flow rate of the indirect refrigerant has decreased, it is determined whether the temperature of the indirect refrigerant is 0 ° C. or higher, and if it is 0 ° C. or lower, it is determined that the refrigerant is in a frozen state. Operate at 0 ° C
In the above case, since it is clogging in the evaporator,
It is configured to stop the compressor.

(D) Means for Solving the Problems The problems to be solved by the present invention are as described above. Next, means for solving the problems will be described.

According to claim (1), the compressor compresses the refrigerant into a high-temperature gaseous state, sends the high-temperature gas to the evaporator via the condenser and the expansion valve, and further refluxes the refrigerant from the evaporator to the compressor. A bypass passage with an open / close solenoid valve is provided between the expansion valve and the evaporator, an electromagnetic flow control valve is provided between the evaporator and the compressor, and at the inlet and outlet of the indirect refrigerant that exchanges heat in the evaporator. An indirect refrigerant temperature detecting means is provided, and in the initial stage of cooling, the indirect refrigerant is rapidly cooled without using the opening / closing electromagnetic valve and the electromagnetic flow control valve, and when the temperature becomes close to the `` set temperature '', the opening / closing electromagnetic valve is closed. Open and bypass the indirect refrigerant, compare the "inlet temperature" of the indirect refrigerant with the "set temperature", and if the "inlet temperature" is lower, set the "target temperature" at the outlet higher, and if the same In, leave the "target temperature" at the exit as it is, In this case, the temperature of the indirect refrigerant is reduced to the "set temperature" by resetting the "target temperature" at the outlet again to change the degree of throttle of the electromagnetic flow control valve to increase or decrease the flow rate of the refrigerant. ] To converge to a lower temperature.

According to claim (2), in the configuration in which the refrigerant is compressed by the compressor into a high-temperature gaseous state, sent to the evaporator through the condenser and the expansion valve, and further returned to the compressor from the evaporator, A bypass passage with an open / close solenoid valve interposed between the expansion valve and the evaporator is provided, and an inlet temperature sensor is provided at the inlet of the indirect refrigerant to the evaporator. In the early stages of the
As the ON / bypass valve is closed, the indirect refrigerant is quenched, and when the temperature approaches the set temperature, the compressor ON / bypass valve open mode and the compressor OFF / bypass valve close mode are repeated to keep the inside of the evaporator The temperature of the passing indirect refrigerant is controlled so as to converge to the set temperature.

According to a third aspect of the present invention, in the refrigerator, the refrigerant is compressed into a high-temperature gas by a compressor, sent to an evaporator through a condenser and an expansion valve, and further returned to the compressor from the evaporator. Providing refrigerant flow rate detection means in the indirect refrigerant passage,
Based on the confirmation of the decrease in the flow rate from the indirect refrigerant flow detecting means, if the indirect refrigerant temperature is lower than 0 ° C, a signal for a freeze release operation is issued. If the indirect refrigerant temperature is 0 ° C or higher, the evaporator is clogged. It is configured to emit a signal notifying that the operation has been performed.

(E) Embodiment The problems to be solved by the present invention and the means for solving the problems are as described above. Next, the configuration of the embodiment shown in the accompanying drawings will be described.

FIG. 1A is a side view showing a state where the refrigerator of the present invention is loaded on a fishing boat, and FIG. 1B is a plan view of the same.

The fishing boat has an engine room 26 and a living space 27 in the center, and a third fish warehouse 23, a second fish warehouse 22, and a first fish warehouse 21 from the front of the living space 27 to the bow.

Further, spare fish storages 24, 25 are also arranged at the rear of the engine room 26.

In the present invention, the seawater in each fish storehouse is cooled by the refrigerator A as an indirect refrigerant.

The refrigerator A is placed on the deck at the front of the living quarters 27 of the fishing boat or as a refrigerator A ', as shown in FIG. It is.

FIG. 2 is a piping circuit diagram showing a control mechanism of the refrigerator of the present invention, FIG. 3 is a refrigeration circuit diagram thereof, FIG. 4 is a flowchart of the control mechanism of the present invention, and FIG. FIG. 5B is a diagram showing a relationship between time and opening and closing of a bypass passage, and FIG. 5C is a diagram showing a relationship between time and an electromagnetic flow control valve voltage when controlled by a control mechanism. FIG. 5D is a diagram showing the relationship between time and the outlet water temperature control target temperature, and FIG. 5E is a diagram showing the relationship between time and the set temperature.

 The overall configuration will be described with reference to FIGS.

The compressor 3 is driven by a dedicated engine provided in the refrigerator A, and the refrigerant is supplied to the condenser 6 in a high-temperature and high-pressure heating steam, that is, a hot gas state.

While passing through the condenser 6, the refrigerant emits heat from the high-temperature and high-pressure superheated vapor and is converted into a high-pressure liquid state. Releases heat into the atmosphere.

The refrigerant in the high-pressure liquid state after passing through the condenser 6 enters the liquid receiver 13, separates the gas-phase refrigerant in the liquid receiver 13, and only the refrigerant in the high-pressure liquid state
It is supplied to the expansion valve 11 via the side glass 14 and the solenoid valve 15.

In the expansion valve 11, the refrigerant in a high-pressure liquid state expands rapidly, and the refrigerant in a low-temperature, low-pressure two-phase flow state becomes superheated vapor, which is returned to the compressor 3 via the electromagnetic flow control valve 2. .

In the refrigerant reflux circuit described above, the condenser 6 is a part that generates heat, and the evaporator 4 is a part that takes away heat.

In order to cool the heat radiation state of the condenser 6, a cooling pump 8
An engine cooling heat exchanger that sucks seawater by the cooling pump 8, supplies the seawater to the outer periphery of a refrigerant pipe of the condenser 6, and cools cooling water of an engine auxiliary machine for driving the compressor 3 and the like. 7 is supplied.

The cooling seawater that has passed through the engine cooling heat exchanger 7 is discharged outboard.

Then, the seawater of Uokura, which is an indirect refrigerant for cooling the Uokura, which is a main part of the present invention, is sucked by the circulation pump 10 and is supplied from the indirect refrigerant inlet pipe 32 to the outside of the refrigerant pipe inside the evaporator 4. , And returns to Uokura from the indirect refrigerant outlet pipe 33.

According to the present invention, in such a configuration, the inlet temperature sensor 17 is provided in the indirect refrigerant inlet pipe 32 for supplying seawater of Uokura, and the indirect refrigerant cooled again to the evaporator 4 is again supplied to the indirect refrigerant outlet pipe 33. Through an outlet temperature sensor 18 and a flow sensor 16 for detecting the flow rate of seawater as indirect refrigerant.

Also, a temperature-sensitive cylinder for measuring the temperature of the refrigerant immediately after leaving the evaporator 4
20 are provided.

In the prior art, a temperature sensor is provided in a part of a pipe that conveys the refrigerant, and the temperature of the refrigerant is controlled to be constant so that the indirect refrigerant, which is seawater in Uokura, is frozen.

However, with this conventional configuration, it was not possible to fix the temperature of the fish storehouse to a narrow temperature range near 0 ° C., which is the ice temperature range.

According to the present invention, the electromagnetic flow control valve 2 is provided on the circuit from the evaporator 4 to the compressor 3, and the high-temperature control is performed between the compressor 3 and the condenser 6 and between the expansion valve 11 and the evaporator 4. A bypass passage 5 for releasing high-pressure superheated steam is provided, an opening / closing solenoid valve 1 is provided in the bypass passage 5, a refrigerant flow rate is controlled by an electromagnetic flow control valve 2, and the bypass passage 5 is turned on by the opening / closing solenoid valve 1. Used together with -OFF control, it enables a wide range of capability control.

In addition, an inlet temperature sensor 17 is provided at the inlet of the indirect refrigerant, which is the seawater of the fish warehouse to be cooled, to the evaporator 4, and an outlet temperature sensor 18 is provided at the outlet from the evaporator 4. Comparison of "Set temperature" or comparison of "Target temperature" and "Set temperature", change of "Target temperature" of "Outlet temperature", and "Outlet temperature" The ON / OFF control of the bypass passage 5 by the open / close solenoid valve 1 is controlled so as to reach the "target temperature".

 19 is a service valve.

(Explanation of Action of Claim (1)) Based on FIG. 4 and FIGS. 5A to 5E, FIG.
The operation of the control mechanism of the refrigerator shown in FIG. 3 will be described.

In the flowchart of FIG. 4, it is first checked whether or not the temperature control mode has started (S1), and then it is checked whether or not the temperature control mode has just started (S2).

The temperature control mode is shown in FIG. 5A.In the initial stage of operation of the refrigerator, Uokura Seawater, which is an indirect refrigerant, is cooled from a temperature considerably higher than the `` set temperature ''. Therefore, in the early stage of cooling, the control is not performed by the on-off solenoid valve 1 or the electromagnetic flow control valve 2, which is a delicate control. This state is referred to as a cooling mode. In the cooling mode, the temperature is rapidly cooled, and the temperature control mode is started only when the temperature of the seawater as the indirect refrigerant drops to a temperature close to the "set temperature".

When the temperature control mode is set for the first time, each voltage is checked. That is, the voltage V of the electromagnetic flow control valve 2
_CTR is fully closed below 1V, fully open above 12V,
V _CTR is set to 5 V, which is the initial voltage value V ₀ . Also, the bypass passage 5
The voltage V _HG of the on-off solenoid valve 1 is set to 12 V, and the bypass passage 5
Is fully opened by the on-off solenoid valve 1 as shown in FIG. 5B (S3).

In S2, if the temperature control mode is not set for the first time, S4 is checked without passing through S3.

In S4, Δt1 is “inlet temperature” as shown in FIG. 5C.
This is the change cycle for comparing the “setting temperature” with the “setting temperature”. That is, in the present embodiment, it is checked whether 30 seconds have elapsed, and if Δt1 has not elapsed, the process returns to the original state (S5).

After Δt1, the “outlet temperature” of the indirect refrigerant detected by the outlet temperature sensor 18 is compared with the “target temperature” of the “outlet temperature” shown in FIG. 5D (S6).

The “target temperature” of the “outlet temperature” includes “inlet temperature”, “set temperature”,
Then, by comparing the "target temperature" with the "set temperature", the time is changed over time.

If the “outlet temperature” is lower than the “target temperature”,
The voltage V _CTR of the electromagnetic flow control valve 2 is changed to the voltage V _CTR + ΔV1 (S9).

When the “outlet temperature” is the same as the “target temperature”, the voltage V _CTR is continued (S8).

If the “outlet temperature” is higher than the “target temperature”,
The voltage V _CTR of the electromagnetic flow control valve 2 is changed to the voltage V _CTR -ΔV2 (S10).

As described above, the change of the voltage of the electromagnetic flow control valve
As shown in the figure, the operation is performed step by step. Thus, the degree of throttle of the electromagnetic flow control valve 2 is changed, the flow rate of the refrigerant is increased or decreased, the cooling capacity is changed, and the “outlet temperature” of the indirect refrigerant is changed.
Is lowered until it undershoots below the "set temperature".

Then, it is checked whether Δt2 has elapsed.
In this case, Δt2 is set to 100 seconds (S10).

If Δt2 has not elapsed, the operation returns to the original state (S1
3).

If Δt2 has elapsed, the “inlet temperature” of the indirect refrigerant is compared with the “set temperature” (S11).

If the “inlet temperature” is lower than the “set temperature”, the “target temperature” is changed to “target temperature + 0.1 ° C.” (S
14).

If the “entrance temperature” and the “set temperature” are the same, the “set temperature” is left as it is.

When the “inlet temperature” is higher than the “set temperature”, the “target temperature” is compared with the “set temperature−0.6 ° C.” (S
12) If the “target temperature” is higher than the “set temperature−0.6 ° C.”, the “target temperature” is changed to the “target temperature−0.1 ° C.” (S15).

If "Target temperature" is equal to or lower than "Set temperature -0.6C", set "Target temperature" to "Set temperature -0.6C".
To (S16).

As described above, the "outlet temperature" and the "target temperature" are changed based on the difference between the "inlet temperature" and the "set temperature" and the difference between the "target temperature" and the "set temperature".

Then, the change of the control mechanism in the change from the cooling mode to the temperature control mode becomes equal to or lower than the set temperature (FIG. 5A).
In addition, the cooling capacity is reduced by opening the bypass passage 5 after the temperature control mode has been entered, and the cooling power is changed by controlling the voltage of the electromagnetic flow control valve 2.

Therefore, from the beginning, instead of controlling the temperature of the indirect refrigerant to the set temperature, at the first stage when entering the temperature control mode from the cooling mode, the "target temperature" of the "outlet temperature"
Is changed to the undershoot position, and the "target temperature" is set lower than the "set temperature" so that the indirect refrigerant approaches the "set temperature" earlier.

Finally, by converging when the temperature of the indirect refrigerant is lower than the “set temperature” by about 0.5 ° C., a temperature close to the “set temperature” can be maintained in Uokura.

(Explanation of Claim (2)) FIG. 6 is an equipment piping circuit diagram according to claim (2), FIG. 7 is a control circuit diagram, FIG. 8 is a circuit diagram in which a refrigeration circuit and an electric circuit are combined, and FIG. Is a control flowchart, and FIG. 10 is a drawing showing a control state.

As a configuration for achieving claim (2), FIG.
As shown in the drawing, the electromagnetic flow control valve 2 in the embodiment of the first claim is omitted, and the flow rate of the refrigerant is not controlled by changing the voltage of the electromagnetic flow control valve 2, and the bypass flow path 5 ON / OFF of the interposed solenoid valve 1 and O of the compressor 3
The control mechanism of the refrigerator is constructed by N-OFF.

Then, the on-off solenoid valve 1 of the bypass passage 5 is turned on and off.
The relay unit 28 and the controller
29 and a switch unit 30 are provided.

(Explanation of Action of Claim (2)) Next, the action of claim (2) will be described with reference to FIGS. 9 and 10.

In FIG. 9, the “entrance temperature” is compared with the “set temperature” (T1). If the “inlet temperature” is higher than the “set temperature + ΔT1”, there is a large difference between the “inlet temperature” and the “set temperature”. Since this is an initial stage, the on-off solenoid valve 1 of the bypass passage 5 must be closed (T2), the entire amount of refrigerant needs to flow through the circuit of the condenser 6 and the expansion valve 11, and the compressor 3 is also driven (T3). .

In this state, the compressor 3 is driven, and the bypass passage 5 is in a closed state, so that the cooling capacity is in the highest state. As in the M1 mode in FIG.

 Then, the flag is set to 0 and the process returns to the original state (T5).

If the “entrance temperature” is lower than the “set temperature + ΔT1” (T1), it is checked whether or not Δt (30 seconds) has passed (T6). Return (T5).

When Δt has elapsed, it is checked whether the next flag is 1 or 0 (T7). If the flag is 0, the opening / closing solenoid valve 1 of the bypass passage 5 is opened (T12), and the compressor 3 is turned on (T13). ,
As indicated by M2 in FIG. 10, the compressor 3 is driven, but by opening the bypass passage 5, the cooling capacity is slightly reduced to cool the compressor 3 gradually to approach the "set temperature".

Then, the “inlet temperature” is compared with the “set temperature−ΔT2” (T14). If the “inlet temperature” is equal to or more than the above, the flag returns to the original without setting a flag. If it is lower than "Temperature- [Delta] T2", the flag is set to 1 (T15) and the process returns to the original state.

Next, in (T7), when the flag is 1, since the initial freezing has been completed, the on-off solenoid valve 1 of the bypass passage 5 is closed (T8), and the compressor 3 is also turned off (T9). This is the state of the mode M3 in FIG.

In such a state of M3, the compressor 3 is stopped and the solenoid valve 1 for opening and closing the bypass passage 5 is also closed.
The cooling capacity is close to zero, and the "inlet temperature" and "outlet temperature" of the indirect refrigerant gradually increase.

Then, it is checked whether or not the "inlet temperature" has exceeded "the set temperature + [Delta] T3" (T10). If it exceeds, the flag is set to 0 (T11) and the process returns to the original state.

If the values are equal to or less than the same, the flag returns to 1 as it is. The above is repeated to control the temperature within a certain range from the set temperature.

(Description of Configuration of Claim (3)) Next, the configuration of claim (3) will be described.

FIG. 11 is a flow chart of the processing control mechanism at the time of freezing of claim (3), and FIG. 12 is a diagram showing the distribution of the "inlet temperature" and the "outlet temperature" at the time of freezing.

The configuration in this case is the same as the configuration of claim (1), and the flow sensor 16 in FIG. 2 plays a large role.

The technique according to claim (3) is a control mechanism for coping with clogging of a circulation path of seawater, which is indirect cooling, and a major trouble when freezing occurs, in a fishing boat refrigerator driven by an engine or a motor. .

The present invention is a control method for constantly detecting the indirect refrigerant flow rate and the indirect refrigerant temperature in order to detect this situation, and thereby selectively executing the cause determination / processing when an abnormality occurs.

Depending on the degree of decrease in the amount of indirect refrigerant, it is divided into the case of only "alarm display" and the case of "forced processing". In the case of "forced processing", the case of "operation stop" and "freeze release operation" depending on the circulating water temperature It is processed separately.

(Explanation of Action of Claim (3)) The action of claim (3) will be described with reference to FIGS. 11 and 12.

In FIG. 11, first, the frozen state detection control is started (P1).

Next, the measurement counter returns both the number of times of measurement i and the integrated flow Q to 0 (P2).

Next, check whether ΔT1 has elapsed (P
3). If ΔT1 has not elapsed, repeat the control,
Wait until ΔT1 has elapsed.

Next, the flow rate q is measured by the flow sensor 16 (P
Four).

 Then, the flow rate q is integrated to obtain an integrated flow rate Q (P5).

 Then, the number of measurements i of the flow rate q is counted (P6).

Then, it is checked whether or not the counting number i has exceeded a certain number N (P7).
Return to (P3).

When the rotation exceeds a certain rotation, the integrated flow rate Q
Calculate the time average flow rate Q from (P8).

Then, it is checked whether the time average flow rate Q exceeds 10 / sec (P9).

When the time average flow rate Q is 10 / sec or less, the "alarm display" (LED) is turned on to perform "forced processing" (P1
2).

Then, it is checked whether or not the circulating water inlet temperature t1 of seawater, which is the indirect refrigerant passing through the flow sensor 16, is 0 ° C. or lower (P13).

When the temperature t1 is equal to or higher than 0 ° C., the compressor 3 is stopped because it is not frozen but clogged. (P1
Five).

If the temperature t1 is equal to or lower than 0 ° C., the portion of the evaporator 4 is frozen, so that a “freeze release mechanism” for supplying high-temperature gas to the evaporator 4 and releasing the freeze is activated (P1).
Four).

When a frozen state occurs in the evaporator 4 of the refrigerator, a difference between the “inlet temperature” and the “outlet temperature” occurs in the indirect refrigerant flow rate as shown in FIG.

The difference between the "inlet temperature" and the "outlet temperature" is detected, and the "freezing release mechanism" is operated.

If the time average flow rate Q exceeds 10 / sec and is 30 / sec or less, the circulating water flow rate decreases and it is a sign of a trouble, so the "alarm display" (LED) is flashed. (P11).

If the time average flow rate Q is 30 / sec or more, there is no abnormality, and the operation is continued as it is.

(F) Effects of the Invention The present invention is configured as described above, and has the following effects.

In the conventional control mechanism of the refrigerator, the refrigerator is controlled by directly controlling the "inlet temperature" as a control object, so that the heat capacity is large like the fishery circulating water. When the object was the object of temperature control, there was a problem that the control was likely to be unstable,
In the present invention, the water temperature of both the "inlet temperature" and the "outlet temperature" is detected, and in the initial stage of cooling, the indirect refrigerant is rapidly cooled without using the on-off solenoid valve and the electromagnetic flow control valve, and the "set temperature" At that time, the opening / closing solenoid valve is opened to bypass the refrigerant, so that the cooling capacity is reduced, control is easy, and accuracy can be improved.

Then, the "inlet temperature" of the indirect refrigerant is compared with the "set temperature", and if the "inlet temperature" is lower, the "target temperature" at the outlet is set higher. ”As it is, and if it is high, the“ target temperature ”at the exit
The temperature of the indirect refrigerant can be converged to a temperature lower than the `` set temperature '' by resetting the temperature of the indirect refrigerant by changing the degree of throttle of the electromagnetic flow control valve to increase or decrease the flow rate of the refrigerant. And the stability of the cooling temperature could be increased.

With the configuration as claimed in claim (2), compared with the temperature difference generated when only the ON / OFF of the compressor, which is a conventional temperature control mechanism, is compared with the ON / OFF of the compressor, the bypass is provided. Since the opening / closing control of the opening / closing solenoid valve 1 of the passage 5 was performed, the control could be performed with a small temperature difference.

That is, in the initial stage of cooling, the compressor is turned on / bypass valve is closed, the indirect refrigerant is rapidly cooled, and when the temperature approaches the set temperature, the compressor is turned on / bypass valve is opened and the compressor is turned off / bypass valve is closed. By repeating the mode, the temperature of the indirect refrigerant passing through the evaporator can converge to the set temperature. In a region close to the "set temperature", the bypass passage 5 is opened to lower the cooling capacity, and Hysteresis due to ON-OFF can be reduced.

Thereby, it is possible to cool to near the freezing limit, and in the temperature control near the ice temperature, the temperature difference between the “outlet temperature” and the “inlet temperature” can be made a small difference of 3 ° C. or less.

As described in claim (3), the refrigerant is compressed by the compressor into a high-temperature gaseous state, and sent to the evaporator via the condenser and the expansion valve.
Further, in the refrigerator configured to return to the compressor from the evaporator, the indirect refrigerant flow detecting means is provided in the indirect refrigerant passage, based on the confirmation of the flow decrease from the indirect refrigerant flow detecting means,
When the indirect refrigerant temperature is lower than 0 ° C, a signal for freezing operation is issued, and when the temperature is 0 ° C or higher, a signal indicating that the evaporator is clogged is configured. Regarding the decrease, whether the clogging of the evaporator 4 or the trouble due to the freezing of the evaporator 4 is determined by the alarm at the temperature at that time, and the trouble can be dealt with according to each trouble.

[Brief description of the drawings]

1A is a side view of the fishing boat loaded with the refrigerator of the present invention, FIG. 1B is a plan view of the same, FIG. 2 is a piping circuit diagram showing a control mechanism of the refrigerator of the present invention, and FIG. FIG. 4 is a flow chart of the control mechanism of the present invention, and FIG.
5A is a diagram showing the relationship between time and circulating water temperature when controlled by the control mechanism of the refrigerator of the present invention, FIG. 5B is a diagram showing the relationship between time and opening and closing of the bypass passage, and FIG. FIG. 5D is a diagram showing a relationship between time and outlet water temperature control target temperature, FIG. 5E is a diagram showing a relationship between time and set temperature, and FIG. )
FIG. 7 is a control circuit diagram, FIG. 8 is a circuit diagram in which a refrigerating circuit and an electric circuit are combined, FIG. 9 is a control flowchart diagram, FIG. 10 is a diagram showing a control state, FIG.
FIG. 12 is a flowchart of the processing control mechanism in the event of freezing according to claim (3). FIG.
FIG. 6 is a diagram showing distributions of “outlet temperature” and “outlet temperature”. A Refrigerator 1 Opening / closing solenoid valve 2 Electromagnetic flow control valve 3 Compressor 4 Evaporator 5 Bypass passage 6 Condenser 7 Engine cooling heat exchanger 8 Cooling Pump 10 …… Circulation pump

──────────────────────────────────────────────────続 き Continuation of front page (72) Inventor Yoshiki Nakano 1-32 Chaya-cho, Kita-ku, Osaka-shi, Osaka Yanmar Diesel Co., Ltd. (56) References JP-A-63-161357 (JP, A) Showa 64-79561 (JP, A) Actually open Showa 63-5353 (JP, U) (58) Fields investigated (Int. Cl. ⁶ , DB name) F25D 13/00 F25B 1/00 101 F25B 1/00 304

Claims (3)

(57) [Claims] A refrigerant is compressed by a compressor to a high-temperature gaseous state, sent to an evaporator through a condenser and an expansion valve, and further returned to the compressor from the evaporator. Providing a bypass passage with an opening / closing solenoid valve interposed between the evaporators, interposing an electromagnetic flow control valve between the evaporator and the compressor,
Providing indirect refrigerant temperature detection means at the inlet and outlet of the indirect refrigerant to exchange heat in the evaporator, in the initial stage of cooling,
Without using the opening / closing solenoid valve and the electromagnetic flow control valve, the indirect refrigerant is rapidly cooled, and when the temperature becomes close to the “set temperature”, the opening / closing solenoid valve is opened to bypass the refrigerant and the “inlet temperature” of the indirect refrigerant. And the "set temperature" .If the "inlet temperature" is lower, reset the "target temperature" at the outlet to a higher value.If the "target temperature" is the same, leave the "target temperature" at the outlet as it is. By resetting the `` target temperature '' at the outlet again, changing the degree of throttle of the electromagnetic flow control valve to increase or decrease the flow rate of the refrigerant, the temperature of the indirect refrigerant is lower than the `` set temperature ''. A control mechanism for a refrigerator characterized by converging to a low temperature. 2. A structure in which a refrigerant is compressed by a compressor into a high-temperature gaseous state, sent to an evaporator through a condenser and an expansion valve, and further returned to the compressor from the evaporator. Provide a bypass passage with an opening / closing solenoid valve interposed between the evaporators, provide an inlet temperature sensor at the inlet of the indirect refrigerant to the evaporator, detect the "inlet temperature" with the inlet temperature sensor, and perform the initial stage of cooling. In, the compressor is turned on / bypass valve closed, the indirect refrigerant is quenched, and when the temperature approaches the set temperature, the compressor ON / bypass valve open and compressor OFF / bypass valve close modes are repeated. A control mechanism for controlling the refrigerator, wherein the temperature of the indirect refrigerant passing through the evaporator is controlled to converge to a set temperature. 3. A refrigerating machine having a configuration in which a refrigerant is compressed by a compressor into a high-temperature gaseous state, sent to an evaporator via a condenser and an expansion valve, and further returned from the evaporator to the compressor. The means is provided in the indirect refrigerant passage, and based on the confirmation of the decrease in the flow rate from the indirect refrigerant flow rate detecting means, when the indirect refrigerant temperature is lower than 0 ° C, a signal for a freeze release operation is issued, In a case, the control mechanism of the refrigerator is configured to emit a signal indicating that the evaporator is clogged.