JP2000130864A - Freezing apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve reliability by eliminating the occurrence of failure in the control of liquid injection into a compressor. SOLUTION: This freezing apparatus includes a compressor for compressing a refrigerant sent from a cooler, a condenser for condensing the refrigerant sent from the compressor, a liquid reservoir 6 for receiving the refrigerant sent from the condenser, the cooler for receiving the refrigerant from the liquid reservoir 6 through a first pipe 8 and a chocking means and for evaporating it, and second pipe 7 for liquid injection control, which takes the refrigerant out of the liquid reservoir 6 to inject it into the compressor and controls a temperature of gas discharged from the compressor. In this case, the height a of an inlet of the first pipe 8, which is measured from a bottom of the liquid reservoir, is made higher than the height b of an inlet of the second pipe 7, which is measured from the bottom of the liquid reservoir.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

[0001] The present invention aims to improve the reliability of a refrigeration system by reducing operation failures in liquid injection control.

[0002]

2. Description of the Related Art FIG. 5 is a view showing a conventional refrigerator, which illustrates a refrigerator having a compressor / condenser and a refrigeration cycle having an expansion valve / cooler. 6 and 7
FIG. 3 is a diagram showing a liquid reservoir of a conventional refrigerator, and is a diagram illustrating removal of a liquid injection pipe and removal of a liquid pipe. FIG. 8 is a view showing the arrangement of a compressor and a liquid injection pipe of a conventional refrigerator, and is a view for explaining an arrangement of a strainer / dryer in the liquid injection pipe.

In FIG. 5, 1 is a refrigerator body, 2 is a compressor for compressing a refrigerant, 3 is a condenser for condensing the refrigerant compressed by the compressor 2, and 4 is an expansion valve for expanding the condensed liquid refrigerant. Reference numeral 5 denotes a cooler that evaporates the refrigerant that has passed through the expansion valve 4. Reference numeral 6 denotes a liquid reservoir for temporarily storing the refrigerant liquefied by the condenser before sending the refrigerant to the expansion valve 4 and for taking the refrigerant in and out in accordance with a load change of the cooler 5. Reference numeral 7 denotes a bypass pipe to the compressor 2 taken directly from the lower part of the liquid reservoir 6, or a bypass pipe to the compressor 2 taken out of the liquid pipe 8 taken out of the lower part of the liquid reservoir 6. A liquid injection pipe for performing so-called liquid injection control for controlling the temperature of the gas discharged from the compressor by injecting the liquid refrigerant in the liquid reservoir 6 into the compressor 2. The liquid injection pipe 7 is provided with an electromagnetic valve 13, and the operation of injecting the liquid refrigerant into the compressor 2 by the liquid injection pipe 7 is executed or interrupted by opening and closing the electromagnetic valve 13.

The refrigerator main body 1 has a compressor 2, a condenser 3, and a liquid reservoir 6. An expansion valve 4 and a cooler 5 are provided outside the refrigerator main body 1, and these components constitute a refrigerator as a whole. The refrigerant flows in the order of the compressor 2, the condenser 3, the liquid reservoir 6, the expansion valve 4, and the cooler 5, and these constitute a refrigerant cycle connected by piping.

In FIG. 5, in order to suppress a rise in the temperature of the refrigerant gas after compression by the compressor 2, the compressor 2
Then, the liquid injection pipe 7 is bypassed to perform liquid injection control. Usually, the liquid pipe 8 also takes out the liquid refrigerant from the lower part of the liquid reservoir 6 to supply the liquid refrigerant to the cooler 5 via the expansion valve 4. The liquid refrigerant take-out configuration of the liquid injection pipe 7 and the liquid pipe 8 at this time is, as viewed in a sectional view of the liquid reservoir 6 in FIG. Has the same height d. In another similar structure, the liquid injection pipe 7 may be taken out from the middle of the liquid pipe 8 taken out from the lower part of the liquid reservoir 6 as shown in FIG.

[0006] In FIG. 8, the liquid injection pipe 7 usually has a rising pipe shape, and has a strainer 10 and a dryer 11 in the middle of the liquid injection pipe 7. The strainer 10 and the dryer 11 have a structure in which the strainer 10 and the dryer 11 are provided at the rising portion of the piping. Further, when the liquid refrigerant in the liquid reservoir 6 is small and flows in two phases of gas and liquid, when the strainer 10 and the dryer 11 are attached upward, the refrigerant is separated into gas and liquid in the strainer 10 and the dryer 11, and the refrigerant gas is removed. It has a structure in which the refrigerant gas accumulates on the top and the refrigerant gas flows into the liquid injection pipe 7 ahead of it.

In FIG. 5, a liquid injection pipe 7
Has a capillary tube 14. The liquid refrigerant is throttled by the capillary tube 14 to perform liquid injection control. At this time, the control of the discharge gas temperature of the compressor 2 is performed by the discharge pipe thermo 9, and when the discharge gas temperature rises abnormally, the refrigerator main body 1 can be stopped.

[0008]

The refrigerator described above performs liquid injection control in order to suppress an increase in the temperature of the discharge pipe. However, when this liquid injection control failure occurs, the temperature of the discharge pipe is reduced. Will rise. Therefore, in order to suppress the rise in the discharge pipe temperature, a discharge pipe thermo 9 is provided in the discharge pipe of the compressor 2, and the upper limit of the discharge pipe temperature is determined by the discharge pipe thermo 9.
C., and control has been performed so that the compressor 2 stops when the temperature exceeds this temperature.

However, there has been a problem that the refrigerator body 1 stops every time the discharge pipe temperature exceeds the upper limit. If this is repeated, the compressor 2 will start and stop repeatedly, and the compressor 2 will suffer a burnout failure. Further, due to poor liquid injection, the oil temperature in the compressor 2 and the temperature of the motor winding tend to increase.
This causes a failure of the compressor 2.

When the refrigerator 1 is stopped and the liquid injection control is stopped, the strainer 10 and the dryer 11 are connected to the liquid injection pipe 7 having the strainer 10 and the dryer 11 so that the level of the liquid refrigerant in the liquid reservoir 6 is increased. If it is provided above, the inner diameters of the strainer 10 and the dryer 11 are larger than the inner diameters of the front and rear connection pipes, so that when stopped, the liquid refrigerant evaporates and becomes empty. Therefore, when the refrigeration apparatus 1 is restarted,
For a few seconds, the liquid injection is insufficient, the temperature of the discharged gas rises, and when the rise is large, there arises a problem that the discharge pipe thermo 9 operates and the refrigerator main body 1 stops.

Further, when the amount of the liquid refrigerant in the liquid reservoir 6 is small, the liquid refrigerant may flow to the liquid injection pipe 7 in a liquid-gas state. At this time, a gas-liquid separation action occurs in the strainer 10 and the dryer 11 in the liquid injection pipe 7, and the gas accumulates at the upper portion and flows to the liquid injection pipe 7, which causes a problem of poor liquid injection. is there.

As another problem, when the refrigerator main body 1 is placed in an environment having a high ambient temperature, the liquid pipe 8 may be heated at the ambient temperature and may not be supercooled. At this time, a flash gas is generated. However, since the refrigerant is usually charged until the flash gas disappears, the refrigerant may be overfilled. Therefore, there is a problem that the high pressure rises and the high pressure is cut.

It is an object of the present invention to provide a refrigeration apparatus which can eliminate defective liquid injection control to a compressor and can improve reliability.

[0014]

In a refrigerating apparatus according to a first aspect of the present invention, a compressor for compressing a refrigerant from a cooler, a condenser for condensing the refrigerant from the compressor, and the condenser From the reservoir, a cooler for evaporating the refrigerant from the reservoir through the first pipe and the throttle device, and a refrigerant taken out of the reservoir and injected into a compressor for compression. A second pipe for liquid injection control for controlling the temperature of the gas discharged from the machine, and the height of the inlet of the first pipe from the bottom of the liquid reservoir is set to the height of the inlet of the second pipe from the bottom of the liquid reservoir. It is larger than the size.

In a refrigeration apparatus according to a second aspect of the present invention, a compressor for compressing the refrigerant from the cooler, a condenser for condensing the refrigerant from the compressor, and receiving the refrigerant from the condenser A sump, a cooler for evaporating the refrigerant from the sump by receiving the refrigerant from the sump via the first pipe and the throttle device, and controlling the discharge gas temperature of the compressor by extracting the refrigerant from the sump and injecting the refrigerant into the compressor. And a second pipe for controlling liquid injection, wherein a strainer and a dryer connected to the second pipe are disposed at a position lower than the refrigerant level in the liquid reservoir.

In a refrigeration apparatus according to a third aspect of the present invention, a compressor for compressing the refrigerant from the cooler, a condenser for condensing the refrigerant from the compressor, and receiving the refrigerant from the condenser. A sump, a cooler for evaporating the refrigerant from the sump by receiving the refrigerant from the sump via the first pipe and the throttle device, and controlling the discharge gas temperature of the compressor by extracting the refrigerant from the sump and injecting the refrigerant into the compressor. A second pipe for controlling liquid injection, and a strainer and a dryer connected to the second pipe are provided in a portion where the flow direction of the refrigerant flowing through the second pipe is downward.

In a refrigeration apparatus according to a fourth aspect of the present invention, in the third aspect, the second pipe is formed with a portion in which the refrigerant flows in an upward direction and a portion in which the refrigerant flows in a downward direction. Such a bent portion is formed, and a strainer and a dryer are provided in a portion where the flow direction of the refrigerant is downward.

In a refrigeration apparatus according to a fifth aspect of the present invention, in any one of the first to fourth aspects, heat exchange is performed between the liquid pipe taken out of the liquid reservoir and the liquid injection pipe. In this case, the liquid pipe is supercooled.

[0019] In a refrigeration apparatus according to a sixth aspect of the present invention, in any one of the first to fifth aspects, a sight glass is provided in the second liquid pipe to visually check for insufficient liquid injection. It is made to be able to judge.

[0020] In a refrigeration apparatus according to a seventh aspect of the present invention, a compressor for compressing the refrigerant from the cooler, a condenser for condensing the refrigerant from the compressor, and receiving the refrigerant from the condenser. A sump, a cooler for evaporating the refrigerant from the sump by receiving the refrigerant from the sump via the first pipe and the throttle device, and controlling the discharge gas temperature of the compressor by extracting the refrigerant from the sump and injecting the refrigerant into the compressor. A second pipe for liquid injection control to be performed, and a valve element for changing a valve opening degree in accordance with a signal from a control element to control a flow rate of the second pipe for liquid injection control, The relationship between the valve opening and the compressor discharge gas temperature is stored in the control element, and when the relationship between the valve opening of the valve element and the compressor discharge gas temperature deviates from a predetermined range, the control is performed. Generate alarm signal from element In which was to so that.

[0021]

1 to 4 are views showing an embodiment of the present invention. Parts similar to those of the conventional device are denoted by the same reference numerals.

Embodiment 1 FIG. 1 is a diagram showing an example of an embodiment of the present invention. FIG. 1A shows a configuration of the liquid reservoir 6 and a liquid injection pipe 7 and a liquid pipe 8 taken out of the liquid reservoir 6. FIG. 1 (b)
FIG. 3 schematically shows an example of a state of a liquid-gas phase of a refrigerant inside a strainer 10 and a dryer 11 provided in the middle of a liquid injection pipe 7.

The embodiment of the present invention has the same general configuration as a refrigeration cycle composed of a refrigeration apparatus whose main part is the refrigerator main body 1 shown in FIG. Embodiment 1
In such an overall configuration, as shown in FIG. 1A, the liquid pipe 8 and the liquid injection pipe 7 taken out of the liquid reservoir 6 are separately taken out.

A liquid pipe 8 taken out of the liquid reservoir 6 and connected to a cooler via a throttle device composed of an expansion valve 4 is inserted into the liquid reservoir 6 through an end face thereof.
The insertion end to the inside, that is, the liquid refrigerant suction port,
It is disposed at a position where the dimension from the lower part of the liquid reservoir 6 is a. On the other hand, a liquid injection pipe 7, which is taken out of the liquid reservoir 6 and connected to the compressor 2 via the strainer 10 / dryer 11 and the capillary tube 14, is inserted into the liquid reservoir 6 through its bottom surface, and is inserted into the liquid injection pipe 7. The insertion end of the liquid refrigerant into the liquid reservoir 6, that is, the liquid refrigerant suction port is disposed at a position where the dimension from the bottom of the liquid reservoir 6 becomes b. Thus, the structure is such that the dimension a from the bottom of the liquid reservoir 6 to the insertion end of the liquid pipe 8 is larger than the insertion depth dimension b of the liquid injection pipe 7.

At this time, it is normal for the height dimension c of the liquid refrigerant in the liquid reservoir 6 to be higher than the dimension a, and the flash gas can be seen in the sight glass 12 attached to the liquid pipe 8. You can confirm that you can not. Conversely, if the dimension a and the dimension c are at the same position or the dimension a is larger than the dimension c, the liquid refrigerant shortage occurs.

This state can be determined by the sight glass 12, and when the dimension b is larger than the dimension c, there is a possibility of insufficient liquid injection. Can be visually judged as the uncooled state and insufficient liquid injection.

According to the first embodiment of the present invention, the liquid reservoir 6 provided in the refrigerator main body 1 and constituting a refrigeration cycle.
A refrigerant circuit pipe 7 for liquid injection control for controlling the compressor discharge gas temperature is taken out from the lower part of the pipe. The liquid pipe 7 is also taken out from the liquid reservoir 6, but the insertion depth of the liquid pipe 8 is smaller than the insertion depth b of the liquid injection pipe 7 into the liquid reservoir 6. The dimension a from the lower part of the liquid reservoir 6 is increased. Therefore, when flash gas is present in the sight glass 12 attached to the liquid pipe 8, the possibility of liquid injection shortage can be visually determined, and liquid injection shortage can be prevented. Stop·
Failures can be reduced and a highly reliable product can be provided.

Embodiment 2 1, a strainer 10 and a dryer 1 provided in a liquid injection pipe 7 are shown.
Reference numeral 1 denotes a structure provided below the liquid reservoir 6. The strainer 10 and the dryer 11 are disposed at positions lower than the liquid level of the liquid refrigerant in the liquid reservoir 6.

When the refrigerator body 1 stops, the solenoid valve 13
Is closed, the liquid injection pipe 7 becomes a closed circuit. However, since the strainer 10 and the dryer 11 are arranged below the liquid refrigerant liquid level in the liquid reservoir 6, FIG. The liquid level in the strainer 10 and the dryer 11 is much higher than the state of the liquid-gas phase inside the strainer 10 and the dryer 11 shown in FIG. The refrigerant is clogged. The liquid refrigerant is in a state of being filled up to just before the solenoid valve 13. Therefore, even after the restart, the liquid injection control is performed without any problem.

According to the second embodiment of the present invention, the liquid injection pipe 7 has the strainer 10 and the dryer 11. These strainers and dryers are provided at the lower part of the refrigerator and not at the rising part.
Thus, even when the refrigerator is restarted, the liquid injection control does not become defective.

Embodiment 3 In FIG. 1, a strainer 10 and a dryer 11 provided in a liquid injection pipe 7 are shown.
When mounting in the vertical direction above the handle, mount so that the flow direction is downward. By mounting in this direction, even when gas-liquid separation occurs inside the strainer 10 / dryer 11, the gas accumulates in the upper part, so that the liquid flows downward stably.

In this embodiment, in order to constitute such a flow structure of the refrigerant, the liquid injection pipe 7 is formed such that a portion where the flow direction of the refrigerant is upward and a portion where the flow direction is downward are formed. In this case, a strainer 10 and a dryer 11 are provided at a portion where a bent portion is formed and the flow direction of the refrigerant is downward. Thereby, the strainer 10 and the dryer 11 are connected to the liquid injection pipe 7.
The portion where the flow direction of the refrigerant is downward in order to provide the above can be appropriately formed without taking extra space.

According to the third embodiment of the present invention, when the above-described strainer / drier is attached to the liquid injection pipe in a vertical direction, it is attached so that the flow direction is downward. With this structure, when the refrigerant is low in the liquid reservoir and the liquid-gas two-phase refrigerant flows into the strainer / dryer, the liquid is collected below even if gas-liquid separation occurs, so that the liquid injection control can be performed stably. It can be carried out.

Embodiment 4 In FIG. 2, the liquid pipe 8 and the liquid injection pipe 7 have a structure in which the liquid injection pipe 7 is tied to the downstream side of the capillary tube 14. High temperature liquid pipe 8 and liquid injection pipe 7
And the liquid pipe 8 can be supercooled.

The liquid injection pipe 7, which is provided in the refrigerator main body 1 and is undercooled and taken out of the liquid reservoir 6, is ligated with the liquid injection pipe 7 to perform heat exchange to supercool the liquid pipe 8. It is. Therefore, it is possible to provide a refrigerator that can prevent the refrigerant from being overcharged, prevent a high pressure rise due to the overcharge, and prevent frequent stoppage due to the high pressure rise.

Embodiment 5 The fifth embodiment shown in FIG. 3 has a structure in which it is possible to visually determine whether there is a liquid shortage from a sight glass 15 provided in the liquid injection pipe 7. Strainer 10 taken out from reservoir 6
A sight glass 1 capable of monitoring a liquid-gas phase state of a liquid injection pipe 7 for injecting a liquid refrigerant into the compressor 2 via a dryer 11 and a capillary tube 14.
5 is provided.

According to the fifth embodiment of the present invention, the sight glass 15 is provided in the liquid injection pipe 7 provided in the refrigerator main body 1. This sight glass 1
Looking at 5, you can visually judge the lack of injection,
Since a stop and a failure due to this can be prevented, a highly reliable refrigerator can be provided.

Embodiment 6 FIG. In FIG. 4, reference numeral 16 denotes a linear expansion valve (Li) which moves the plunger in the axial direction in response to a control signal applied to the coil, and controls the opening of the throttle portion by the axial movement of the piston by driving the plunger.
near Expansion Valve: Hereafter, L
EV). Reference numeral 17 denotes a thermistor that is provided on the discharge pipe of the compressor 2 and detects the temperature of the discharge pipe. Reference numeral 18 denotes a control element including a control board. Reference numeral 19 denotes an alarm device. The valve element composed of the LEV 16 is controlled by a control element composed of the control board 18, and performs liquid injection control by a liquid injection pipe 7 for injecting the liquid refrigerant taken out from the liquid reservoir 6 into the compressor 2. Control board 1
The control element 8 receives the output of the thermistor for detecting the discharge pipe temperature of the compressor 2 as an input, sends a control signal to the valve element made of the LEV 16 in response to this input, and controls the opening degree. The control elements composed of the control board 18 include L
The correlation between the valve opening of the EV 16 and the discharge pipe temperature of the compressor 2 is stored. When the relationship between the valve opening of the LEV 16 and the discharge pipe temperature of the compressor 2 deviates from a predetermined range, the control board The control element 18 sends an alarm signal to the alarm device 19.

The liquid injection control is performed by the control board 18
The liquid injection amount is adjusted by the valve element of the LEV 16 controlled by the control element of the LEV 16. At this time,
Valve opening of LEV 16 and thermistor 17 attached to discharge pipe
The relationship of the discharge gas temperature detected by the
To be stored. In the case of a normal valve opening of the LEV 16, that is, a normal liquid injection flow rate, the discharge gas temperature also becomes a certain temperature, but in the case of insufficient liquid injection, the discharge gas temperature rises.
The relationship between the valve opening and the discharge gas temperature is broken.

Here, the signal is sent to a control element composed of the control board 18, and in the case of liquid injection control failure, an alarm signal is issued from the control board 18 to the alarm device 19, and an alarm is issued from the alarm device 19. Can be. Thereby, it is possible to prevent the stoppage by the discharge pipe thermo 9 and the damage to the compressor 2 due to the liquid injection control failure.

According to the sixth embodiment of the present invention, the liquid injection control is performed by the valve element made up of the LEV 16 and the relationship between the valve opening degree of the valve element made up of the LEV 16 and the discharge pipe temperature is determined in advance by the control board 18. When a deviation from the normal relationship between the valve opening of the LEV 16 and the discharge pipe temperature is detected, a signal can be sent to issue an alarm. Therefore, it is possible to prevent a stop and a failure due to insufficient injection, so that a highly reliable refrigerator can be provided.

[0042]

According to the refrigeration apparatus of the first invention, the height of the first pipe inlet for supplying the refrigerant from the liquid reservoir to the cooler via the expansion device from the liquid reservoir bottom is determined by the liquid. Since the height of the second pipe inlet for liquid injection control for taking out the refrigerant from the reservoir and injecting it into the compressor to control the compressor discharge gas temperature from the bottom of the liquid reservoir is made larger than the liquid for liquid injection control, Since it is possible to appropriately secure the refrigerant and prevent the shortage of the liquid injection, it is possible to reduce the stop / failure of the refrigerator due to this, and to provide a highly reliable product.

According to the refrigeration apparatus of the second invention, the strainer connected to the second liquid injection control pipe for taking out the refrigerant from the liquid reservoir and injecting it into the compressor to control the temperature of the gas discharged from the compressor is provided. Since the dryer is disposed at a position lower than the liquid level of the refrigerant in the liquid reservoir, it is possible to reliably operate the liquid injection control even when the refrigerator is restarted, without causing liquid injection control failure.

According to the refrigeration apparatus of the third aspect, the strainer connected to the second liquid injection control pipe for taking out the refrigerant from the liquid reservoir and injecting it into the compressor to control the temperature of the gas discharged from the compressor is provided. Since the dryer is provided in a portion where the flow direction of the refrigerant flowing through the second pipe is downward,
When the refrigerant is low in the liquid reservoir and the liquid-gas two-phase refrigerant flows into the strainer / dryer, the liquid is stored below even if gas-liquid separation occurs, so that the liquid injection control can be stably performed. The liquid refrigerant in the reservoir is low and the liquid
Even when the gas two-phase refrigerant flows through the liquid injection pipe, the operation can be performed so that the liquid injection control does not become defective.

According to the refrigeration system of the fourth aspect, the refrigerant flows from the liquid reservoir to the second pipe for liquid injection control for controlling the temperature of the gas discharged from the compressor by injecting the refrigerant into the compressor. Since a bent portion is formed such that an upward portion and a downward portion are formed and a refrigerant flow direction is provided with a strainer and a dryer in a downward direction, the strainer and the dryer are provided. The portion where the flow direction of the refrigerant is downward can be appropriately formed without taking extra space.

According to the refrigeration apparatus of the fifth aspect, the first refrigerant is supplied from the liquid reservoir to the cooler via the expansion device.
A refrigerant is taken out of the pipe and the liquid reservoir, a refrigerant is taken out, injected into the compressor, and heat is exchanged with a second pipe for liquid injection control for controlling the temperature of the gas discharged from the compressor to supercool the first pipe. As a result, it is possible to reliably prevent the undercooling of the first pipe from being undercooled, to appropriately prevent the refrigerant from being overcharged, to prevent the high pressure from being caused by the overcharge, and to frequently stop due to the high pressure. It is possible to provide a refrigeration apparatus that eliminates operation.

In the refrigeration apparatus according to the sixth aspect of the present invention, the sight glass is provided in the second pipe for liquid injection control for taking out the refrigerant from the liquid reservoir and injecting it into the compressor to control the temperature of the gas discharged from the compressor. By looking at the sight glass, it is possible to visually judge the lack of liquid injection, and it is possible to provide a refrigeration apparatus with high reliability because it is possible to prevent a stop and a failure due to this.

A refrigeration apparatus according to a seventh aspect of the present invention is provided with a valve element for changing the valve opening in accordance with a signal from the control element to control the flow rate of the second pipe for liquid injection control. The relationship between the valve opening degree and the compressor discharge gas temperature is stored in the control element, and when the relation between the valve opening degree of the valve element and the compressor discharge gas temperature deviates from a predetermined range, an alarm signal is output from the control element. , It is possible to prevent a stop and a failure due to insufficient liquid injection, so that a highly reliable refrigerator can be provided.

[Brief description of the drawings]

FIG. 1 is a configuration diagram showing Embodiments 1 to 3 of the present invention.

FIG. 2 is a configuration diagram showing a fourth embodiment of the present invention.

FIG. 3 is a schematic configuration diagram showing a fifth embodiment of the present invention.

FIG. 4 is a schematic configuration diagram showing a sixth embodiment of the present invention.

FIG. 5 is a schematic configuration diagram illustrating a conventional refrigeration cycle.

FIG. 6 is a configuration diagram for explaining a conventional liquid reservoir and taking out of a liquid pipe / liquid injection pipe.

FIG. 7 is a configuration diagram for explaining a conventional method of taking out a liquid reservoir and a liquid pipe / liquid injection pipe.

FIG. 8 is a schematic configuration diagram illustrating a conventional compressor periphery and a liquid injection pipe.

[Explanation of symbols]

1 refrigeration equipment, 2 compressors, 3 condensers, 4 expansion valves,
5 Cooler, 6 liquid reservoir, 7 liquid injection piping, 8 liquid piping, 9 discharge pipe thermo, 10 strainer, 11 dryer, 12 sight glass, 13 solenoid valve, 14 capillary tube, 15 sight glass, 16 LEV valve element , 17 thermistor,
18 A control element comprising a control board.

Claims (7)

[Claims] 1. A compressor for compressing a refrigerant from a cooler,
A condenser for condensing the refrigerant from the compressor; a liquid reservoir for receiving the refrigerant from the condenser; and a cooler for evaporating the refrigerant from the liquid reservoir by receiving the refrigerant from the liquid reservoir through a first pipe and a throttle device. And a second pipe for liquid injection control for taking out a refrigerant from the liquid reservoir and injecting it into a compressor to control a compressor discharge gas temperature, wherein a height of the inlet of the first pipe from a bottom of the liquid reservoir is provided. A refrigeration system wherein the size is larger than the height of the second pipe inlet from the bottom of the liquid reservoir. 2. A compressor for compressing a refrigerant from a cooler,
A condenser for condensing the refrigerant from the compressor; a liquid reservoir for receiving the refrigerant from the condenser; and a cooler for evaporating the refrigerant from the liquid reservoir by receiving the refrigerant from the liquid reservoir through a first pipe and a throttle device. And a second pipe for liquid injection control for taking out a refrigerant from the liquid reservoir and injecting it into a compressor to control a compressor discharge gas temperature, wherein a strainer and a dryer connected to the second pipe are provided. A refrigeration apparatus, wherein the refrigeration apparatus is disposed at a position lower than a liquid level of a refrigerant in a liquid reservoir. 3. A compressor for compressing a refrigerant from a cooler,
A condenser for condensing the refrigerant from the compressor; a liquid reservoir for receiving the refrigerant from the condenser; and a cooler for evaporating the refrigerant from the liquid reservoir by receiving the refrigerant from the liquid reservoir through a first pipe and a throttle device. And a second pipe for liquid injection control for taking out a refrigerant from the liquid reservoir and injecting it into a compressor to control a compressor discharge gas temperature, wherein a strainer and a dryer connected to the second pipe are provided. 2. A refrigeration apparatus provided in a portion where the flow direction of the refrigerant flowing through the second pipe is downward. 4. A bent portion is formed in the second pipe so that a portion in which the flow direction of the refrigerant flows upward and a portion in which the flow direction of the refrigerant flows downward are formed, and the flow direction of the refrigerant flows downward. The refrigeration apparatus according to claim 3, wherein a strainer and a dryer are provided in the portion. 5. The liquid pipe according to claim 1, wherein heat exchange is performed between the liquid pipe taken out of the liquid reservoir and the liquid injection pipe to supercool the liquid pipe. A refrigeration apparatus according to any one of the claims. 6. The refrigeration system according to claim 1, wherein a sight glass is provided in the second liquid pipe so that a shortage of liquid injection can be visually judged. apparatus. 7. A compressor for compressing a refrigerant from a cooler,
A condenser for condensing the refrigerant from the compressor; a liquid reservoir for receiving the refrigerant from the condenser; and a cooler for evaporating the refrigerant from the liquid reservoir by receiving the refrigerant from the liquid reservoir through a first pipe and a throttle device. A second pipe for liquid injection control for taking out a refrigerant from the liquid reservoir and injecting it into a compressor to control a compressor discharge gas temperature, and changing a valve opening degree in response to a signal from a control element to perform liquid injection. A valve element for controlling the flow rate of the second pipe for control, wherein a relationship between a valve opening degree of the valve element and a compressor discharge gas temperature is stored in the control element, and a valve of the valve element is stored. A refrigeration system wherein an alarm signal is issued from the control element when the relationship between the opening degree and the compressor discharge gas temperature deviates from a predetermined range.