JPH03181766A - container refrigeration equipment - Google Patents

Abstract

PURPOSE:To enable a temperature monitoring work in a refrigerator to be carried out in response to a characteristic of a loaded cargo through a simple and rapid fixing work by a method wherein a storing case for storing a loaded cargo for a monitoring work is installed in the refrigerator, the loaded cargo for a monitoring operation is fixed in a cargo temperature sensor storing case. CONSTITUTION:A temperature of a loaded cargo FR for a monitoring operation to be stored in a terminal box (a storing case) 23 is sensed by use of a product temperature sensor PS inside a refrigerator of a container refrigerating device is detected by use of a product temperature sensor PS and then a capability of a cooling device 4 is controlled in such a way as a loaded cargo temperature to be detected by the product temperature sensor PS may become the set temperature. Thus, it is possible to prevent effectively a deterioration of accuracy of control caused by a difference between an air temperature and a loaded cargo temperature caused by an amount of aspiration heat of the loaded cargo stored in the refrigerator A or an existence or a nonexistence of a precooling and an inputted heat from an external surrounding atmosphere caused by ventilation work. A location where a loaded cargo FR for a monitoring operation, i.e., the terminal box 23 is arranged can be set to a specified location (whenever a loaded cargo is set in the refrigerator A), and further a sensor fixing operation can be performed without applying any troublesome operation as to a selection of the loaded cargo for a monitoring operation, a countermeasure against a breakage of a sensor lead wire connecting through a signal between a controller 20 and the sensor PS, and its fixing method or the like every time the loaded cargo is set to the freezer.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a container refrigeration system equipped with a refrigeration circuit and configured to maintain the internal temperature at a predetermined low temperature state, and in particular,
Concerning improving workability of temperature control.

(Prior Art) Conventionally, as disclosed in Japanese Patent Publication No. 52-40063, for example, as shown in FIG. A fan that circulates the air through the cooler is placed inside the refrigerator, and an air temperature sensor that detects the air temperature inside the refrigerator is placed on the outlet side and cooling side of the cooler, and these two air temperature sensors detect the air temperature. This is a known technology that attempts to maintain agricultural products such as fresh fruits and vegetables at an appropriate temperature by controlling the operation of each device in the refrigeration circuit so that the air temperature inside the refrigerator converges to a set value. It is.

(Problem 8 to be solved by the invention) By the way, especially for agricultural products such as fruits and vegetables, if the holding temperature is too high, they will ripen too quickly, but if the holding temperature is too low, they will freeze, so the required holding temperature range is extremely narrow. , and differs depending on the type.

Here, as shown in FIG. 6, for example, a fan (C) is placed above the cooler (b), and the fan (c) draws in air from above through the cooler (b). Inside the refrigerator (a
) In the case of a bottom-blowing container refrigeration system that blows air from below, the blowing air temperature detected by the air temperature sensors (d) and (e) installed on the blowing side and the cooling side of the cooler (b) or If the intake air temperature is controlled to the set temperature, there will be a difference between the outlet air temperature and the intake air temperature, as shown in the figure, due to the intrusion of heat from the outside due to ventilation inside the warehouse and the respiration heat of the cargo. arise. In other words, although it is necessary to consider the outlet air temperature and the suction air temperature, in actual control, control is always selectively performed based on one of the temperatures. Refrigeration capacity is controlled based on a temperature that is significantly different from the high temperature, and there is a risk that the quality of the cargo may be impaired.

Therefore, it is conceivable to attach a product temperature sensor to the cargo that directly detects the temperature of the cargo itself, and to control the refrigerating capacity according to that temperature. It is difficult to decide whether to attach it to the cargo, and it is also necessary to take measures to prevent the sensor lead wire that connects the sensor and controller from breaking or to fix the sensor lead wire. There is a possibility that the effort becomes complicated.

The present invention has been made in view of the above, and its purpose is to standardize the location and mounting condition of the sensor that detects the temperature of the cargo itself.
It is an object of the present invention to provide a refrigeration system capable of controlling the temperature inside the warehouse according to the characteristics of the cargo with simple and quick installation work.

(Means for solving the problem) As shown in FIG. 1, the first means for solving the above object is a cooler (4) that is connected to a refrigeration circuit and cools the inside of the refrigerator (A); The object is a container refrigeration system equipped with a fan (4a) that circulates air inside the warehouse (A) via the cooler (4), and a product temperature sensor (PS) that detects the temperature of cargo.

A storage case (23) for storing the monitor cargo (FR) is provided in the warehouse (A), and the temperature sensor (PS) is connected to the monitor cargo (FR) in the storage case (23). ).

A second solution is that the storage case (23) in the first solution is installed on the suction side of the cooler (4).

A third solution is that the storage case (23) in the first solution is installed on the outlet side of the cooler (4).

A fourth solution is that the storage case (23) in the first solution is installed on the suction side and the outlet side of the cooler (4).

(Function) With the above configuration, in the invention of claim (1), the inside of the refrigerator (A
), the product temperature sensor (ps) is placed in the storage case (23
), the location for placing the monitor cargo (FR) is set to a specific location, and the cargo is set in the warehouse (A). In some cases, complicated efforts regarding installation locations, measures against disconnection of sensor lead wires, fixing methods, etc. can be saved.

According to the invention of claim (3), in the invention of claim (1), the storage case (23) is arranged on the suction side of the cooler (4), so the sensor lead wire can be shortened and reliability is improved. In addition to this, the installation work of the sensor will be easier when setting the cargo in the warehouse (A).In addition, this product temperature sensor (PS) will be used to manage the temperature inside the warehouse. As a result, the refrigerating capacity is controlled using the maximum temperature of the cargo in the warehouse (A) as an index, and ripening of the cargo can be prevented.

In the invention of claim (3), in the invention of claim (1), the storage case (23) is installed on the outlet side of the cooler (4), so reliability is improved by shortening the sensor lead wire. At the same time, the work of attaching the sensor at the time of setting is performed easily. In addition, by managing the temperature inside the warehouse using this product temperature sensor (PS),
The cooling capacity is controlled using the minimum temperature of the cargo in the warehouse (A) as an index, preventing the cargo from freezing, thereby shortening the pull-down time.

In the invention of claim (4), in the invention of claim (1), a storage case (23) installed on the outlet side and the suction side of the cooler (4), a product temperature sensor (23) in the storage case (23), P.S.
), (PS) always knows the maximum and minimum temperature of the cargo in the warehouse (A), so by controlling the temperature in the warehouse (A) based on both, it is possible to control the temperature of a wide range of fresh foods. Quality will be ensured.

(Example) Hereinafter, an example of the present invention will be described based on the drawings.

FIG. 1 shows the configuration of a bottom-blowing container refrigeration system (A) according to an embodiment of the present invention.
is provided with a cooling chamber (24) for cooling the inside (A), and the cooling chamber (24) is equipped with a refrigeration circuit (not shown).
A cooler (4) that is connected to the cooler (4) and functions as an evaporator, and a fan (4a) that circulates the air in the refrigerator (A) through the cooler (4) are arranged. )
An air outlet (25) is provided at the bottom of the refrigerator (A) to blow out cold air from the fan (4a), and an air outlet (25) is provided at the top of the cooling chamber (24) to blow out cold air from the refrigerator (A). An air inlet (26) is provided for sucking in air.

Next, inside the car (A) is a storage section (27) for storing cargo.
), a floor duct (28), a side wall duct (29), and a ceiling duct (30) through which cool air blown out from the air outlet (25) flows, and the fan (4)
After cooling the indoor air sucked in by the cooler (4),
The air is supplied from the air outlet (25) to the inside of the warehouse (A) through the ducts (28) to (30), and is also circulated through the gap into the storage section (27) and stored in the storage section (27). This is to cool down the cargo.

Here, as a feature of the present invention, the air outlet (25)
And the air suction port (26) is equipped with monitor cargo (FR).
Two terminal boxes (23) and (23) are arranged as storage cases for storing fruits (for example, fruits), and each terminal box (23) has the same configuration, and as shown in FIGS. As shown in Figure 3, the main components include a main body (35), a lid (36), and a lid gasket (37) held between the lid (36) and the main body (35). . and,
The main body (35) has a storage part (35a) for storing the monitor cargo (FR), and supports the storage part (35a) to connect the terminal box (23) to the air outlet (25) or the air suction port. (
26).

Furthermore, inside the storage part (35a) of the terminal box (23), a product temperature sensor (
As shown in Figures 4(a) to (C), the product temperature sensor (PS) is attached to a knife-shaped mounting part (38).
) and embed it inside the monitor load (FR) to detect the temperature near the center of the monitor load (FR) (see figure (a)); When detecting the surface temperature of a monitor load (FR) by attaching a PS) to the surface of the monitor load (FR) (see figure (b)), and when installing a product temperature sensor (PS). When detecting the average temperature near the center and near the surface of a monitor cargo (FR) by attaching it a predetermined distance from the tip of the part (38) to the blade side ((c) in the same figure)
), either of which may be adopted.

The temperature sensors (PS+) and (PS2) in each of the terminal boxes (23) and (23) are connected to a controller (2) located in the machine room (not shown) of the container refrigeration system.
0) with a sensor lead wire, and the controller (20) controls each product temperature sensor (PS+),
The capacity of the cooler (4) is controlled so that the cargo high temperature detected by (PS2) becomes the set temperature inside the warehouse.

An example of the control content will be explained based on the flowchart of FIG. 5. In step U1, the operating mode is determined from the value of the set temperature SP, and if SP≧10°0°C, it is the chilled mode or pre-frozen mode. , it is determined that the product temperature control mode should be used, the process moves to step U2, and the product temperature control mode is selected as the control mode. That is, in step U3, it is determined whether the cargo high temperature PT detected by the product temperature sensor (Psi) on the outlet side is within an appropriate temperature range (for example, SP+1°C or lower), and if it is within the appropriate temperature range, step U4 is performed. While pulling down is performed with the capacity of the cooler (4) at 100%, the high temperature PT of the cargo on the outlet side is (SP+1).
When the temperature falls below C and enters the appropriate temperature range, the process moves to step U5, where the suction side cargo high temperature PT2 detected by the product temperature sensor (PSz) placed on the suction side falls within the appropriate temperature range (for example, SP±1℃). ), and determine whether PT2≧SP+
If it is 1, it is determined that the capacity of the cooler (4) needs to be increased, and the capacity of the cooler (4) is increased to 100 in step U6.
%, and if SP 1<PT2<SP+1, it is determined that a fine adjustment of the ability is necessary, and step U7 is performed.
PID control the capacity of the cooler (4) using PT! <5P-
If it is 1, it is determined that the cooling is too much, and the inside of the refrigerator (A) is heated up in step U8. That is, at the time of pull-down, by controlling the capacity of the cooler (4) according to the load high temperature PT on the outlet side, which is the lowest of the actual load high temperatures, the internal temperature can be rapidly brought to the set temperature SP. While converging and preventing the cargo from freezing, after the high cargo temperature PT on the outlet side enters the appropriate temperature range, by controlling the high cargo temperature PT2 on the suction side to the set temperature SP,
By controlling the temperature of the monitor cargo (FR) on the suction side, which is close to the highest temperature of the actual cargo high temperature, as an index,
This is designed to prevent ripening of the cargo stored in the warehouse (A) due to an excessive rise in the temperature of the cargo.

For items such as fish that will be stored in frozen mode, monitor cargo (FR) should be placed in the terminal box (23),
(23), each product temperature sensor (Psi),
(PS!) only in the terminal box (23).

(23), they are made to function as a blowout sensor that detects the blowout air temperature and a suction sensor that detects the suction air temperature, respectively, and the set temperature SP is -10, When the temperature is 1° C. or lower, a frozen mode is set and control is performed using the outlet air temperature or the intake air temperature as an index.

Therefore, in the invention of claim (1), in the interior (A) of the container refrigeration system (A), the terminal box (storage case)
(23) The temperature of the monitor cargo (FR) stored in the interior is detected by the product temperature sensor (PS), and the high cargo temperature detected by the product temperature sensor (PS) becomes the set temperature. Since the capacity of the cooler (4) is controlled, the inside of the refrigerator (A)
It is possible to effectively prevent deterioration in control accuracy due to the difference between the air temperature and the cargo high temperature caused by the amount of respiratory heat of the cargo stored in the container, the presence or absence of pre-cooling, heat intrusion from the outside due to ventilation, etc. .

Then, the monitor cargo (
FR) is stored, and the temperature of this monitoring cargo (FR) is detected by a product temperature sensor (ps).
The monitor cargo (FR), that is, the terminal box (23), can be placed in a specific location, and each time the cargo is set in the warehouse (A), the monitor cargo is selected and the controller ( 20) and the sensor (PS) for signal connection, the sensor can be installed without having to take any troublesome measures to prevent disconnection of the sensor lead wire, how to fix it, etc.

In the invention of claim (2), in the invention of claim (1), since the product temperature sensor (Psi) is disposed on the suction side of the cooler (4), the signal connection with the controller (20) is not possible. The sensor lead wire to be connected can be shortened, reliability can be improved, and the sensor installation work can be easily performed when setting the cargo in the warehouse (A).

In addition, by controlling the temperature inside the warehouse using a temperature higher than the temperature of the cargo in the warehouse (A) as an index, it is possible to prevent ripening due to temperature rise for fresh foods that are preferably kept at a relatively low temperature. It has a preventive effect.

In the invention of claim (3), the terminal box (23) is connected to the cooler (4).
), it is possible to improve reliability by shortening the sensor lead wire, and also to simplify the installation work of the sensor at the time of setting. In addition, by managing the temperature inside the refrigerator using a temperature lower than the temperature of the cargo inside the refrigerator (A) as an index during pull-down, for example, for items with thin outer skins, etc., for which it is desired to control the internal temperature a little higher. It has the advantage of preventing quality deterioration due to temperature drops, especially freezing. Furthermore, this allows the cooler (4) to make full use of its capacity during pulldown, thereby shortening the pulldown time.

In the invention of claim (4), since the terminal boxes (23) and (23) are installed on the outlet side and the suction side of the cooler (4), the maximum temperature of the cargo in the refrigerator (A) and the The temperature inside the refrigerator can be managed while always knowing the minimum value. For example, control can be performed using the average value of both detection values, or control can be performed by switching the index between pull-down and in-range as in the above example, thereby ensuring quality for a wide range of fresh foods. There are many advantages.

In addition, in the said Example, it is a terminal goods box (23).

(23) are installed on the outlet side and suction side of the cooler (4), but the present invention is not limited to such embodiments, and for example, they are installed on the floor duct (28), ceiling duct (30), etc. It goes without saying that you can.

(Effects of the Invention) As explained above, according to the invention of claim (1), in a container refrigeration system, a storage case storing a cargo for monitoring is arranged in the refrigerator, and the cargo for monitoring is By installing a temperature sensor, it is possible to accurately control the temperature inside the warehouse at a temperature close to the temperature of the cargo being stored. Installation work can be carried out without having to worry about the location, measures to prevent disconnection of sensor lead wires, and fixing methods.

According to the invention of claim (3), in the invention of claim (1), since the storage case is installed on the suction side of the cooler,
By shortening the sensor lead wire, it is possible to improve reliability and simplify the installation work, and by managing the temperature inside the refrigerator using the lowest temperature of the cargo inside the refrigerator as an indicator,
The effect of preventing ripening etc. can be obtained for fresh foods that dislike high temperature conditions.

According to the invention of claim (3), in the invention of claim (1), since the storage case is installed on the outlet side of the cooler, reliability is improved by shortening the sensor lead wire and installation work is simplified. In addition, by managing the internal temperature using the maximum temperature of the cargo in the Itlr as an index, it is possible to prevent fresh foods that dislike low temperatures from freezing.

According to the invention of claim (4), in the invention of claim (11), storage cases are installed on the outlet side and the suction side of the cooler, so that the highest and lowest cargo temperatures within the city can be adjusted. The temperature inside the refrigerator can be managed while keeping track of the
Quality can be ensured for a wide variety of fresh foods.

[Brief explanation of drawings]

1 to 5 show embodiments of the present invention, FIG. 1 is a longitudinal sectional view showing the internal structure of a container refrigeration system, FIGS. 2 and 3 show the structure of a terminal box, and FIG. Figure 2 is a partially cutaway side view, Figure 3 is a partially cutaway front view, and Figure 4 is a partially cutaway side view.
Figures (a) to (c) show how to attach a sensor to a cargo for monitoring, in order to detect the center temperature of the cargo, to detect the surface temperature, and to detect the average temperature between the center and the surface. FIG. 5 is a flowchart showing an example of cooling capacity control. FIG. 6 is a vertical cross-sectional view showing the configuration of a conventional container refrigeration system and the temperature distribution at that time. A Inside 4 Cooler 4a Fan 23 Terminal box (storage case) PR monitor cargo PS Temperature sensor 2nd figure

Claims (4)

[Claims] (1) A cooler (4) that is connected to the refrigeration circuit and cools the inside of the refrigerator (A), a fan (4a) that circulates the air inside the refrigerator (A) through the cooler (4), and the cargo This is a container refrigeration system equipped with a product temperature sensor (PS) that detects the temperature of the product, and a storage case (23) for storing monitor cargo (FR) is provided in the warehouse (A). A container refrigeration system characterized in that a temperature sensor (PS) is attached to a monitoring load (FR) inside the storage case (23). (2) The container refrigeration system according to claim (1), wherein the storage case (23) is arranged on the suction side of the cooler (4). (3) The container refrigeration system according to claim (1), wherein the storage case (23) is arranged on the outlet side of the cooler (4). (4) Claim (1) characterized in that the storage case (23) is arranged on the outlet side and the suction side of the cooler (4).
Container refrigeration equipment as described.