JPH0420765A - Freezer - Google Patents

Abstract

PURPOSE:To perform a self-sensing of a clogged state by a method wherein a condensor and an expansion valve are connected by a pipeline through a pressure switch and an increased pressure of refrigerant in the pipeline caused by a clogging in a filter is detected by a pressure switch. CONSTITUTION:A suction port 24 is formed at a right side wall of a right side case 1 of a condensor 3 at a position facing through a filter 23 covering a right side surface by the right side surface of the condensor 3. Air sucked by an air blower 21 through a suction port 24 and having its dusts removed therefrom is blown against the condensor 3, passes in the case 1 and is discharged out of a discharging port 22. Within the case 1 is connected a high pressure switch 25 for sensing an abnormal increasing of pressure of refrigerant in a pipeline 14 and stopping an operation of a freezer and a pressure switch 27 in the midway part of the pipeline 14 for connecting the condensor 3 with the expansion valve 4. A buzzer 28 operated in response to an opening or closing of a contact point of the pressure switch 27 is disposed at a front surface of a control panel 26. The pressure switch 27 senses an increased pressure caused by a clogging of the filter 23 of the refrigerant in the pipeline 14 for connecting the condensor 3 with the expansion valve 4, is operated and then the buzzer 28 rings and generates an alarm.

Description

[Detailed Description of the Invention] [Industrial Application Field] This invention cools the condenser of a refrigerator whose components include a compressor, an evaporator + m tension/close valve, and a forced air-cooled condenser.
A cold W1 machine is installed, which is equipped with a pressure switch that detects clogging of the filter that filters dust from the air blown into the condenser.

[Conventional technology]

In a refrigerator that uses a compression V11 evaporator 6m tension valve and a forced air-cooled condenser as a WlrL element to perform a refrigeration action, the gaseous refrigerant that has been compressed by the compressor and becomes high temperature and high pressure is cooled by the condenser and loses the heat of evaporation. It is taken away and becomes liquid.

At this time, if the condenser is a forced air cooling type, the refrigerant is passed through a filter that filters out dust on the outer circumferential surface of the condenser to prevent dust from adhering to the condenser surface and reducing the heat exchange rate. It is cooled by air blown by a blower. Therefore, if the filter becomes clogged with dust in the air, the amount of air blown to the outer surface of the condenser will decrease, and the refrigerant in the condenser will not be sufficiently cooled, causing the gaseous refrigerant in the refrigerant circuit from the condenser to the expansion valve to The pressure increases significantly compared to normal usage conditions, reducing the cooling capacity of the refrigerator. Additionally, if the pressure of the liquid refrigerant in the refrigerant circuit from the condenser to the expansion valve abnormally increases beyond the maximum set pressure of the refrigerant circuit, the high-pressure switch normally installed to protect the refrigerant circuit will operate and the refrigerator will stops. Therefore, in order to prevent the chiller's cooling capacity from decreasing due to filter clogging or the cold IK machine suddenly stopping due to the activation of the high pressure switch, it is necessary to regularly inspect and clean the filter. Although it is necessary to maintain the condition normally, a conventional example 3 of this type is shown in FIG.

Figure 2 shows the main front part V! showing the configuration of one conventional refrigerator.
FIG.

In FIG. 2, 1 is a case that covers the outer peripheral surface of the refrigerator, and inside this case 1 is a pressure H machine 21 that constitutes the refrigerator.
Forced air-cooled tube-fin type condenser 3. An expansion valve 4 and an evaporator 5 are provided, and refrigerant inlets 6, 7, 8.9 and an outlet 10.111213 formed therein, respectively, are alternately connected by pipes 14 to supply the refrigerant. A circuit 15 is formed. Along the left side of the coil-shaped cooling pipe 16 that extends vertically while meandering left and right of the evaporator 5 of the refrigerant circuit 15, a coil-shaped cooling pipe 16 that extends vertically while meandering left and right in the same manner as this cooling pipe 16 is installed. , a fluid to be cooled by the evaporator 5, such as water, oil, etc. 17
A cooled body conduit 20 is provided in which an inlet 18 and one outlet on both sides through which water flows in and out project to the left from the left side surface of the case 1. Further, inside the case 1, a blower 21 is supported on the ceiling surface thereof, and on the ceiling of the case 1 above the blower 21, there is a hole in the vertical direction that communicates with the inside and outside of the case 1 at a position facing the blower 21. Exhaust port 22
is formed. On the other hand, on the right side wall of the case 1 on the right side of the condenser 3, there is an inlet port, which is a hole in the left and right direction that communicates with the inside and outside of the case 1, at a position where the right side of the condenser 3 faces through the filter 23 that covers this valley side. 24 is formed, and the air that is sucked in from the intake port 24 by the blower 21 and from which dust is removed by the filter 23 is blown to the condenser 3,
After passing through the case 1 and being discharged from the exhaust port 22, there is a pipe lit! inside the case 1 that connects the condenser 3 and the expansion valve 4. 14, a high pressure switch 2 is installed that detects an abnormal pressure rise of the refrigerant in this pipe line 14 and stops the refrigerator.
5 is connected to the case 1, and an FfIJ control panel 26 containing a control device (not shown) for controlling the refrigerator is disposed at the upper right of the case 1.

It is sucked in from the inlet 6, compressed by the compressor 2, and then sent to the outlet 10.
The high-temperature, high-pressure gaseous refrigerant discharged from the inflow lower into the condenser 3 is cooled by air blown by the blower 21 onto the outer circumferential surface of the condenser 3, and the heat of evaporation is removed. It is taken away and becomes liquid. This liquid refrigerant passes from the outlet 11 through the pipe 14 and the expansion valve 4, becomes a low-pressure, low-temperature liquid-gas mixture, enters the evaporator 5, evaporates, and passes through the cooling pipe 16 and the object pipe 20. The object to be cooled 17 flowing through the tube wall of the object to be cooled 20 is cooled to perform a refrigeration action, and is again sucked into the compressor 2 through the inlet 6 to repeat the refrigeration cycle.

[Problem to be solved by the invention]

However, in such conventional refrigerators, when the filter 23 is not regularly inspected and cleaned, or when the filter 23 suddenly becomes clogged for some reason,
The amount of air blown to the outer circumferential surface of the condenser 3 is reduced and the condenser 3
Since the refrigerant in the GI-path 14 between the condenser 3 and the expansion valve 4 is not sufficiently cooled, the refrigerating capacity of the refrigerator decreases, and the object 17 to be cooled may not be cooled to a predetermined temperature. The filter 23 is not activated until the pressure rises abnormally and the high pressure switch 25 is activated, causing the refrigerator to suddenly stop during operation.
There is an r':'I problem of noticing clogging.

The present invention provides a refrigerator that self-detects the clogging condition of the filter before the refrigerating capacity of the refrigerator decreases due to the filter clogging or the high pressure switch operates and the refrigerator suddenly stops. The task is to

[Means to solve the problem]

In order to solve the above problems, according to the present invention, the components include a compressor, an evaporator, an expansion valve, and a forced air-cooled condenser, and the condenser passes through a filter that passes the dust in the air. Cold 'IKF' cooled by blown air
! In 1, the condenser and the expansion valve are connected by a pipe line via a pressure switch, and the pressure switch detects an increase in pressure of the refrigerant in the f line due to clogging of the filter. do.

[Effect]

According to this invention, a forced air-cooled condenser and an expansion valve, which are components of a refrigerator, are connected by a pipe line through a pressure switch, and a filter filters dust in the air blown to the condenser. The pressure switch detects an increase in the pressure of the refrigerant in the pipe line due to clogging, so even if the filter is not inspected and cleaned regularly, or if the filter suddenly becomes visible due to some reason. Even in the event of a blockage, the pressure switch prevents the refrigerant in the pipe connecting the condenser and expansion valve from reaching the filter, reducing the refrigerating capacity of the refrigerator or causing the high-pressure switch to operate. It can be activated by detecting a rise in pressure due to clogging, and when this pressure increase is detected and activated, an alarm or warning can be displayed externally with an alarm buzzer-1 alarm lamp, etc. to request that the filter be inspected and cleaned. .

〔Example〕

An embodiment of the invention will be described based on FIG. FIG. 1 is a front longitudinal sectional view showing the main part of a refrigerator according to an embodiment of the present invention, and parts common or identical to those in FIG. 2 are indicated by the same symbols.

In FIG. 1, 1 is a case that covers the outer peripheral surface of the refrigerator, and inside this case 1 is a compressor 2 that constitutes the refrigerator.
．． Condenser 3. An expansion valve 4 and an evaporator 5 are provided,
A refrigerant inlet 6 formed in each of these,
7, 8.9 and the outlet ports 10, 11, and 12.13 are alternately connected by pipes 1114 to form a refrigerant circuit 15.

A coil is formed along the left side of the cooling pipe 16 of the evaporator 5 in the refrigerant circuit 15, and a flow at both ends through which a cooled object 17, such as water or oil, which is a fluid to be cooled by the evaporator 5, flows in and out. The inlet 18 and the outlet 19 protrude leftward from the left side of the case 1 to form a cooled pipe 20, and inside the case 1, a blower v121 is supported on the ceiling surface. An exhaust port 22 is formed in the ceiling of the case 1 above the blower 21 at a position facing the blower 21. On the other hand, an intake port 24 is also formed on the right wall of the case 1 on the right side of the condenser 3 at a position where the right side of the condenser 3 faces through a filter 23 that covers this right side. Blower 21
The air that is sucked in through the intake port 24 and from which dust is removed by the filter 23 is blown into the condenser 3, passes through the case 1, and is discharged from the exhaust port 22. Furthermore, inside the case 1, there is a pipe line 1 connecting the condenser 3 and the expansion valve 4.
4, a high pressure switch 25 and a pressure switch 27, which detect an abnormal pressure rise of the refrigerant in this pipe line 14 and stop the refrigerator, are connected, and this pressure switch 27
A buzzer 28, which operates when the contacts of 1 and 2 are opened, is provided on the front surface of a control panel 26, which is located at the upper right of the case 1 and houses a WVI controller (not shown) for the refrigerator.

In the above-mentioned configuration, the refrigerating action of the refrigerant is the same as that of the conventional example, or the degree of clogging of the filter 23 is such that the degree of clogging of the filter 23 reaches a point before the refrigerating capacity of the refrigerator decreases or the high-pressure pressure switch 25 becomes activated. , the pressure switch 27 detects a pressure increase due to the clogging of the refrigerant filter 23 in the pipe line 14 connecting the condenser 3 and the expansion valve 4, and operates, and accordingly, the buzzer 28 sounds to issue an alarm. Therefore, if filter 23
Even if regular inspection and cleaning of the cooled object 1 is not carried out,
7 is no longer cooled to a predetermined temperature, or the pressure of the refrigerant in the conduit 14 between the condenser 3 and the expansion valve 4 rises abnormally, causing the high pressure switch 25 to operate and the refrigerator to suddenly stop during operation. It can be confirmed that the filter 23 is clogged before the filter 23 is used, and the filter 23 can be inspected and cleaned in advance.

〔Effect of the invention〕

According to this invention, a forced air-cooled condenser and an expansion valve, which are components of a refrigerator, are connected by a pipe through a pressure switch, and dust in the air blown to the condenser is removed. The pressure switch detects an increase in the pressure of the refrigerant in the pipeline due to clogging of the filter, so even if the filter is not inspected and cleaned regularly or the filter is damaged for some reason. Even if the filter starts to become clogged, before the refrigerating capacity of the refrigerator decreases or the high-pressure pressure switch operates, the pressure switch will operate and the alarm buzzer - 1 alarm lamp will be activated, and the filter will be inspected and cleaned externally. An alarm or warning can be displayed. As a result, there is an effect that the object to be cooled is not cooled to a predetermined temperature level during operation of the refrigerator, or the refrigerator suddenly stops and the object that is not being cooled cannot be cooled.

[Brief explanation of drawings]

FIG. 1 is a front longitudinal sectional view of a main part showing the structure of a refrigerator according to an embodiment of the present invention, and FIG. 2 is a front longitudinal sectional view of a main part showing the structure of a conventional refrigerator. 1... Case, 2... Compressor, 3... Condenser, 4
... Expansion valve, 5... Evaporator, 6, 7, 8, 9.18
... Inlet, 10.11, 12.13.19... Outlet, 14... Pipe line, 15... Refrigerant circuit, 16...
- Cooling pipe, 17... Cooled object, 20... Cooled object pipe line, 21... Air blower, 22... Exhaust port, 23...
Filter, 24... Intake port, 25... High pressure switch, 26... Control panel, 27... Pressure switch, 2
8...Buzzer

Claims (1)

[Claims] 1) In a refrigerator that includes a compressor, an evaporator, an expansion valve, and a forced air-cooled condenser, the condenser is cooled by air blown through a filter that filters dust in the air. A refrigerating machine, characterized in that the expansion valve is connected to the refrigerant by a conduit through a pressure switch, and the pressure switch detects an increase in pressure of the refrigerant in the conduit due to clogging of the filter.