JPH0413076A - Cooling chamber device - Google Patents

Abstract

PURPOSE:To permit the cooling of a condenser and a compressor in accordance with the characteristics of the machines and instruments by a method wherein an opening degree changing means, changing the opening degree of the opening of an air flow passage, is provided at the side of the inlet port of the flow passage, in which the compressor is arranged, and a control means, controlling the opening degree changing means in accordance with the detecting temperature of a temperature detecting means, is provided. CONSTITUTION:When a ventilating fan 7 is operated, atmosphere flows into an air flow passage 11a in a machine room 2 through an air intake port 5 whereby a condenser 8 and a compressor 9 are cooled. In this case, the opening degree of the inlet port of the air flow passage 11a, in which the compressor 9 is arranged, is controlled by a control unit 20 through opening degree changing means 13a, 13b in accordance with the temperature of the compressor, which is detected by a temperature sensor 21. When the temperature of the compressor is low, the opening degree changing means 13a, 13b are operated to the side of 'close' to reduce the amount of air flowing around the compressor 9. On the contrary, when the temperature of the compressor is increased and cooling is necessitated, the opening degree changing means are operated to the side of 'open' to increase the amount of air flowing around the compressor. Accordingly, the condenser 8 and the compressor 9, which are arranged in one air flow passage 11a, can be cooled in accordance with the characteristics of the instrument and machine by one set of the ventilating fan 7.

Description

DETAILED DESCRIPTION OF THE INVENTION [Purpose of the Invention (Industrial Field of Application) This invention relates to a refrigerator apparatus in which a condenser and a compressor installed in a machine room are cooled by forced ventilation.

(Prior Art) In a refrigerator (corresponding to a cooling storage device), as shown in FIG. The evaporator installed inside a (
condenser C1 that constitutes a refrigeration cycle together with
Equipment such as a hermetic compressor d is installed.

By the way, in order to efficiently operate the refrigeration cycle of the refrigerator, it is necessary to improve the heat exchange performance of the condenser C and further protect the compressor d from the effects of heat.

Therefore, in refrigerators, the condenser C1 compressor d is cooled by forced ventilation. Conventionally, such a cooling structure has one air flow system in a machine room that communicates with an air intake port (e) provided in the machine room and an air outlet (not shown), as shown in FIG. A path f is formed, and this air flow path f
For example, a structure is used in which the condenser C1 compressor d and the blower fan g are installed in this order from the upstream side.

As a result, outside air is taken into the machine room by the operation of the blower fan g in conjunction with the operation of the refrigeration cycle, and while this outside air is flowing through the air flow path f, the condenser C1 compressor d
is cooled down. After cooling, the air is discharged to the outside from the air outlet.

(Problem to be Solved by the Invention) By the way, in order to maintain good refrigeration cycle operation of a refrigerator, the condenser C needs to be constantly cooled during the refrigeration cycle operation, but the compressor d needs to be cooled during the refrigeration cycle operation. varies depending on the condition. Especially when starting up the refrigeration cycle quickly, cooling is not required much.

However, according to the machine room structure described above, during the operation of the refrigeration cycle, the outside air is always kept in the air flow path f by the ventilation fan g.
distributed in

For this reason, there is a problem that cooling is too strong at the start-up of the refrigeration cycle, the temperature rise of the compressor d slows down, and it takes time for the refrigeration cycle to stabilize.

Therefore, it is conceivable to use two blower fans to cool the condenser C and the compressor d for each purpose.

However, in this case, the simple cooling structure with one air flow path f and one blower fan g is impaired, and the cost is high. Moreover, it has the disadvantage of consuming a large amount of power, and is not suitable for the actual situation.

This invention was made with attention to these circumstances,
The purpose is to provide a refrigerator device that can cool a condenser and compressor in accordance with the equipment characteristics while maintaining a simple structure with one blower fan and one flow path system. It is in.

[Structure of the Invention] (Means for Solving the Problems) In order to achieve the above object, the refrigerator apparatus of the present invention is provided with a temperature detection means for detecting the compression temperature in the compressor, and A wall portion is provided in the passage portion to divide the passage portion into a passage portion in which the compressor is disposed and a passage portion without the compressor, and an opening of the air passage is provided on the population side of the passage portion where the compressor is located. A variable opening means for varying the opening degree is provided, and a control means is provided for controlling the variable opening means in accordance with the temperature detected by the temperature detecting means.

(Function) According to the refrigerator device of the present invention, when the blower fan operates, outside air flows into the air flow path in the machine room through the air intake port. The condenser and compressor are then cooled by the outside air flowing through this air flow path.

Here, the opening degree of the inlet side of the air flow path where the compressor is located is controlled by the opening degree variable means according to the temperature of the compressor.

As a result, when the temperature of the compressor is low, such as when it is better to reduce cooling or not to cool, the opening variable means operates to the "close" side, and the area around the compressor is closed. Reduce the amount of air flowing. Conversely, when the compressor temperature rises and cooling is required, the opening variable means is set to "open".
This increases the amount of air flowing around the compressor.

Therefore, while maintaining the simple structure of one blower fan and one air flow path, the condenser can always be sufficiently cooled and the compressor can be cooled according to the condition of the compressor. In other words, the condenser and compressor can be cooled in accordance with the equipment characteristics.

(Example) The present invention will be described below based on a first example shown in FIGS. 1 to 7. FIG. 1 shows the lower side of a refrigerator to which the present invention is applied, such as a refrigerator, where 1 is a storage chamber for storing food and the like, and 2 is a machine room provided at the bottom of the storage chamber 1. The machine room 2 is located on the bottom wall 1a of the box-shaped refrigerator main body 3.
Above, a partition wall 4 having, for example, an inverted cross-section and an L-shape in outer shape is attached to the side wall 1b and the rear wall I of the refrigerator main body 3.
It is configured to be erected so as to face and be spaced apart from C.

And partition wall 4. Bottom wall 1a, side wall 1b, rear wall 1c
The L-shaped space inside the refrigerator body 3 surrounded by is defined as a machine room 2. An air intake port 5 with a filter is provided on the front wall of the refrigerator main body 3, which faces one end of the machine room 2, and outside air can be taken into the machine room 2 through the air intake port 5. It is now possible to do so. Further, an air outlet 6 is provided in the rear wall IC of the refrigerator main body 3 facing the other end of the machine room 2, and the air in the machine room 2 can be discharged to the outside from this air outlet 6. .

Thereby, an L-shaped air passage 11 is formed inside the machine room 2, with the inlet side communicating with the air intake port 5 and the outlet side communicating with the air outlet 6. However, 24 is air flow path 1
This is the second suction port provided in the flow path portion on the side of the first inlet.

In the flow path portion on the rear side of the air flow path 11, a blower fan such as a propeller fan 7 is connected to the motor 7a from the air intake port 5 side.
An axial fan 7, a condenser 8, and a hermetic compressor 9 (which has a compressor section and a motor section for driving the compressor built in a hermetic case 9a) are installed in this order.

Although not shown, the compressor 9 and condenser 8 are connected to an evaporator and a pressure reducing device provided in the storage chamber 1 via refrigerant pipes, and constitute a refrigeration cycle for cooling the inside of the storage chamber 1. be. In addition, a plate-shaped partition wall 10 is interposed in the air flow path portion where the compressor 9 is disposed, and is located directly above the compressor 9 and divides the flow path portion into upper and lower halves. As shown in FIG. 2, only the flow path portion is divided into a lower space portion 11a where the compressor 9 is arranged and an upper space portion 11b where the compressor 9 is not present.

Further, a gate opening/closing mechanism 12 is provided at the entrance of the lower space portion 11a. As shown in FIGS. 3 to 5, the gate opening/closing mechanism 12 includes, for example, left and right double-opening door bodies 1 on both sides in the width direction of the air flow path 11 constituting the inlet.
, 3a, 13b (opening degree variable means) are rotatably supported,
A structure in which a link type drive mechanism 14 is connected to these door bodies 13a and 13b is used.

That is, 15 is a pulse motor installed on the wall portion of the partition wall 100 on the entrance side. This pulse motor 15 is arranged eccentrically toward the center of the refrigerator, for example. A motor shaft 15a of the pulse motor 15 rotatably passes through the partition wall 10 and projects into the lower space portion 11a.

At the tip of the motor shaft 13, a band-shaped arm] 6 is provided to protrude in a direction perpendicular to the motor shaft 13. Further, at the tip of this arm, there is a pair of elongated plate-like links 18a that are overlapped with each other with a bottle 17 interposed therebetween.

The ends of 18b are rotatably connected. The other ends of these links 1.8a, 18b are rotatably connected via pins 19 to, for example, the upper end portions of the door bodies 13a, 13b near the pivot shafts. As a result, by utilizing the movement of the pair of links 18a and 18b whose opening angle changes as the arm 16 rotates,
As shown in FIGS. 4 and 5, door bodies 13a, 13
b can be driven to the closing side and 1 to the opening side.

Further, the opening/closing operation of the gate opening/closing mechanism 12 is controlled according to the temperature of the compressor 9. This control circuit is shown in FIG.

To explain the control circuit, 20 is a control section (control means) composed of, for example, a microcomputer.

The control unit 20 has a built-in storage unit and a timer (both not shown). For example, a temperature sensor 21 (temperature detection means) provided in the closed case 9a of the compressor 9 is connected to the control section 20, and the temperature of the compressor 9 detected by the temperature sensor 21 through the closed case 9a is connected to the control section 20. Temperature can be input to the control section 20. The pulse motor 15 of the gate opening/closing mechanism 12 is connected to this control section 20 . Further, in the storage unit of the control unit 20, for example, as the temperature of the compressor 9 rises, the door bodies 13a, 13
A map shown by a proportional relationship diagram in which the opening degree of b is set to a large value is stored. And the control section 20
According to the input temperature of the compressor 9, the opening corresponding to the same temperature is read from the storage section, and a drive signal corresponding to the read opening is output to the pulse motor 15. This allows the degree of opening of the flow path in which the compressor 9 is arranged to be adjusted according to the temperature of the compressor 9. In other words, the amount of air flowing around the compressor 9 can be adjusted according to the temperature of the compressor 9.

Note that the control unit 20 is connected to an internal temperature sensor 23 provided in the storage chamber 1, a motor unit (not shown) of the compressor 9, and a motor 7a of the axial fan 7, and can be operated from the operation unit 22. The compressor 9. The axial fan 7 is activated. However, in order to protect the safety of the compression units 8 and 9, the storage unit of the control unit 20 stores the time tm required to stop the compression units 8 and 9 for a certain period of time, and the upper limit safe temperature Ts of the compressor 9. The refrigeration cycle is stored in the controller 20, and even if the operation on signal is input, the refrigeration cycle is not operated until the above tm has elapsed.
During operation of the refrigeration cycle, when the temperature reaches Ts, the compressor 9 is stopped and does not operate until the temperature reaches Ts or lower.

Next, the operation of the refrigerator configured as described above will be explained based on the flowchart shown in FIG.

For example, when the temperature from the internal temperature sensor 23 exceeds the refrigeration temperature set by the operation unit 22, that temperature is input to the control unit 20 as “operation on”.

Here, the timer of the control unit 20 determines the stop time t of the compressor 9.
If the compressor 9 is not stopped for a certain period of time tm or more to protect the compressor 9, the compressor 9 and the axial fan 7 will remain stopped.

If it has stopped for a certain period of time tm or more, the control unit 20
outputs a drive signal to the compressor 9 and the axial fan 7. As a result, the compressor 9 and the axial fan 7 start operating. Then, by operating the compressor 9, a refrigerating cycle is formed in which the refrigerant circulates through the condenser 8, the pressure reducing device, and the evaporator in order, and the storage chamber 1 is cooled.

Furthermore, by the operation of the axial fan 7, outside air is taken into the machine room 2 through the air intake port 5 at the front of the refrigerator. Next, the outside air flows along the air flow path 11 and cools the condenser 8 along the way. After this cooling, the air flows through the air flow paths 11a, l.
up to lb. As a result, the condenser 8, which requires cooling, is always sufficiently cooled.

On the other hand, the temperature of the compressor 9 is input to the control unit 20 from the temperature sensor 21 . Then, the opening degree data corresponding to the temperature of the compressor 9 is read from the storage section. Specifically, since the refrigeration cycle is in startup operation, a low temperature is input to the control unit 20 as the temperature of the compressor 9. At this point, the temperature of the compressor 9 is quite low at first, so it is "fully opened".
is read as opening data. Then, the control section 20 outputs a control signal to the pulse motor 15 of the gate opening/closing mechanism 12 according to this opening degree data. As a result, the door bodies 13a and 13b become "fully open" as shown in FIG.

When the temperature of the compressor 9 gradually increases due to the continuation of the compression operation, the control section 20 reads corresponding opening degree data from the storage section, controls the pulse motor 15 according to the read opening degree data, and controls the door body. 13a, 13a are rotated to the open side. As a result, an amount of air corresponding to the opening degree flows through the air flow path 11a and cools the compressor 9. Of course, the opening degree adjustment according to the temperature of the compressor 9 is performed in the range from "fully closed" to "fully open".

By adjusting the opening degree in this manner, the amount of air flowing through the air flow path 11b is appropriately adjusted in accordance with the cooling performance required by the compressor 9.

The air that has cooled the compressor 9 is then transferred to the air flow path 11.
While merging with the cooled air of the condenser 8 that has passed through b.
The air is discharged from the air outlet 6 to the rear of the refrigerator.

Note that during such refrigeration cycle operation, if the temperature of the compressor 9 exceeds the safe temperature Ts, the control unit 20 determines that safety will be compromised and sends a signal to the compressor 9 to stop the operation (refrigeration cycle operation; interruption). is output. However, during this refrigeration cycle, if an "operation off" signal is input from the internal temperature sensor 23, the compressor 9 is stopped regardless of the safe temperature Ts.

Thus, during operation of the refrigeration cycle, the condenser 8 is always sufficiently cooled, and the compressor 9 is cooled depending on the state of the compressor 9.

Therefore, one axial fan 7. one air flow path 11
The condenser 8 and compressor 9 can be cooled in accordance with the equipment characteristics while maintaining a simple machine room structure.

In addition, in the first embodiment, the air flow path 1 is controlled electrically.
Although an example has been given in which the opening degree of the air flow path 11b is adjusted, the opening degree of the air flow path 11b may be adjusted by other structures, such as mechanical control.

An example of the mechanical type is shown in FIG. 8 as a second embodiment.

The second embodiment shows a structure in which opening and closing of one side of the door bodies 13a and 13b, for example, the door body 13a, is adjusted. That is, in the adjustment structure shown in the second embodiment, a bellows 30 is provided on the side surface constituting the air flow path 11 with the end side (air outlet side) fixed, and the other end of the bellows 30 is
Slideably connected at the door body 13a (based on a structure in which the slider 32 is slidably locked in the long groove 31)
The connected connecting rods 33 are connected. In addition, a temperature detection section 3 made of a hollow member with good heat conductivity is installed in the closed case 9a of the compressor 9.
4 are placed closely together. The temperature detection section 34 and the bellows 30 are connected to each other via a communication tube 35, and the bellows 30. Tube 35. It has a structure in which the temperature detection section 34 is filled with gas. Note that 36 is a coil spring for applying force for return to the bellows 30, and 37 is a spring fixing seat.

According to this structure, when the temperature of the compressor 9 is low,
Although the gas inside the temperature detection part 34 does not expand, the door body 13a
becomes "fully closed". Then, as the temperature of the compressor 9 increases with the compression operation, the gas within the temperature detection section 34 expands. The expansion force of this gas causes the bellows 30 to
is extended, and the door body 13a is rotated to the opening side. In other words, the opening degree of the air passage 11b can be controlled in accordance with the expansion force of the gas generated depending on the temperature of the compressor 9, as in the first embodiment.

Note that the same effect can be obtained by using a shape memory alloy instead of the expansion force of gas.

Further, in each of the above-described embodiments, the sensor section for detecting the temperature of the compressor is provided in the closed case of the compressor, but the sensor section is not limited to this. Alternatively, the temperature of the compressor may be detected by providing a sensor section in the winding portion that constitutes the motor section inside the sealed case.

In addition, although this invention was applied to a refrigerator, it is not limited to this.
The present invention may be applied to refrigerator devices such as refrigerator-freezers and freezers.

[Effects of the Invention] As explained above, according to the present invention, while maintaining a simple structure with one blower fan and one flow path system,
The condenser and compressor can be cooled according to equipment characteristics.

[Brief explanation of drawings]

1 to 7 show a first embodiment of the invention,
Figure 1 is a partially cutaway perspective view showing the structure of the machine room of a refrigerator, Figure 2 is a side sectional view of the machine room along line A-A in Figure 1, and Figure 3 is a cooling compressor. A perspective view showing the structure for adjusting the amount of air, Fig. 4 is a bottom view showing the state where the air flow path is fully open, Fig. 5 is a bottom view showing the state where the air flow path is fully open, and Fig. 6 is a bottom view showing the state where the air flow path is fully open. A block diagram showing a control circuit for controlling the opening of the air flow path, FIG. 7 is a flowchart showing the control of the air flow path along with operation of the refrigeration cycle, and FIG. 8 is a bottom view showing a second embodiment of the present invention. 9 are partially cutaway sectional views showing the structure of the machine room of a conventional refrigerator. DESCRIPTION OF SYMBOLS 1... Accommodation room, 2... Machine room, 5... Air intake port, 6... Air outlet, 7... Axial fan (blower fan), 8... Condenser, 9 ... Compressor, 10... Partition wall, 11... Air flow path, 11a, 11 b-... Air flow path, 13a213b... Door body, 14... Drive mechanism, 15... Valve motor , 20...control unit, 21.
...Temperature sensor. 13a Cause diagram

Claims (1)

[Claims] Inside the machine room with air intake and air outlet,
The refrigerator apparatus has a machine room structure in which an air flow path is formed that communicates with the air intake port and the air outlet, and this air flow path is provided with a blower fan, a condenser that constitutes a refrigeration cycle, and a compressor. The compressor is provided with a temperature detection means for detecting the compressor temperature, and a wall portion divides the air flow path portion where the compressor is located into a flow path portion where the compressor is disposed and a flow path portion where the compressor is not present. and an opening variable means for varying the opening degree of the air flow path is provided on the inlet side of the flow path portion where the compressor is located, and the opening degree is variable according to the temperature detected by the temperature detection means. A refrigerator apparatus characterized in that it is provided with a control means for controlling the means.