JPH1114166A - Freezer device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To keep a high capability of a compressor against a freezer device in which gaseous refrigerant of middle pressure is fed into the compressor as injection gas, by a method wherein an inverse flow of gaseous refrigerant in an injection passage is restricted without adjusting a pressure within a gas- liquid separator. SOLUTION: This freezer device is constructed such that an inner passage 10a of an injection pipe 10 is formed with a fluid diode 28 in respect to a freezer device, in which a gas-liquid separator is connected to a compression chamber 24 of a compressor 1 so as to feed gaseous refrigerant of middle pressure within the gas-liquid separator. An inverse flow of the gaseous refrigerant is restricted in the case that an inner pressure in the compression chamber 24 becomes higher than an inner pressure of the gas-liquid separator.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a refrigeration system in which an intermediate-pressure gas refrigerant in a refrigerant circuit is introduced into a compressor as an injection gas, and more particularly to a countermeasure for suppressing a backflow of an injection gas in an injection passage.

[0002]

2. Description of the Related Art Conventionally, as a refrigerating apparatus for injecting a medium-pressure gas refrigerant into a compressor for the purpose of improving the condenser capacity of a refrigerating circuit, for example, Japanese Patent Laid-Open Publication No.
What is disclosed in the 7062 gazette is known.
Specifically, the refrigerant circuit includes a compressor, an indoor heat exchanger, a first pressure reducing valve, a gas-liquid separator, a second pressure reducing valve, and an outdoor heat exchanger connected by a refrigerant pipe. The gas-liquid separator and the compressor are connected by an injection pipe. The injection pipe is provided with an injection valve, and is opened in response to an injection request.

For example, during a heating operation, high-pressure refrigerant discharged from a compressor is condensed in an indoor heat exchanger and reduced in pressure to an intermediate pressure by a first pressure reducing valve. The intermediate-pressure refrigerant is separated into a gas refrigerant and a liquid refrigerant by a gas-liquid separator. The liquid refrigerant is depressurized by the second pressure reducing valve, and then evaporates in the outdoor heat exchanger and returns to the compressor. On the other hand, when the injection valve is open, the gas refrigerant in the gas-liquid separator has a difference between the internal pressure (intermediate pressure) of the gas-liquid separator and the compression chamber pressure of the compressor (low pressure at the start of the compression operation). It is sucked into the compression chamber of the compressor via the injection pipe by pressure. As a result, the amount of refrigerant flowing through the indoor heat exchanger increases, and the heating capacity can be improved. On the other hand, during the cooling operation, the amount of heat exchange of the refrigerant evaporated in the indoor heat exchanger increases, and the cooling capacity can be improved.

[0004]

However, if the pressure in the compression chamber becomes higher than the internal pressure of the gas-liquid separator in a state where the gas-liquid separator and the compression chamber are in communication with each other, the gas-liquid The gas refrigerant will flow back toward the separator.
That is, a part of the refrigerant compressed in the compression chamber leaks toward the gas-liquid separator.

[0005] In this case, the capacity of the compressor cannot be sufficiently ensured, and the refrigerating capacity is reduced, so that the original purpose of gas injection cannot be achieved.

In order to prevent this backflow, it is conceivable to set the internal pressure of the gas-liquid separator higher by reducing the degree of pressure reduction by the pressure reducing valve. It is not preferable because a sufficient amount of gas refrigerant cannot be secured, which leads to a decrease in injection amount.

SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a gas-liquid separator for a refrigeration system in which an intermediate-pressure gas refrigerant is introduced as an injection gas into a compressor. An object of the present invention is to suppress the backflow of the gas refrigerant in the injection passage without adjusting the internal pressure and maintain the capacity of the compressor high.

[0008]

SUMMARY OF THE INVENTION In order to achieve the above object, the present invention provides an injection passage extending from a gas-liquid separator to a compression chamber of a compressor by providing resistance to a flow toward the compressor. Instead, a means for providing resistance to the backflow toward the gas-liquid separator is provided.

More specifically, as shown in FIG. 1 and FIG. 2, the invention according to claim 1 includes a compressor (1) and a gas-liquid separator (4), in which a refrigerant circulates so as to carry heat. Refrigerant circulation circuit (8)
And the gas refrigerant separated by the gas-liquid separator (4)
The injection passage (10a, 10a) introduced into the compression chamber (24) of (1)
23b) is assumed. From the gas-liquid separator (4) to the compression chamber (24) to the injection passage (10a, 23b)
Backflow suppressing means (28) for increasing the flow path resistance to the gas refrigerant flowing backward from the compression chamber (24) toward the gas-liquid separator (4) than the flow path resistance to the gas refrigerant flowing toward I have.

According to this specific matter, when the gas refrigerant separated by the gas-liquid separator (4) is introduced into the compression chamber (24), the refrigerant flows from the gas-liquid separator (4) toward the compression chamber (24). On the other hand, there is almost no flow path resistance, and the flow is smoothly introduced into the compression chamber (24). Thereby, the refrigerating capacity is improved by the original effect of gas injection. On the other hand, when a backflow from the compression chamber (24) to the gas-liquid separator (4) occurs, a large flow resistance acts on the refrigerant flow. For this reason,
The amount of refrigerant leakage from the compression chamber (24) to the gas-liquid separator (4) can be reduced, and the capacity of the compressor (1) is sufficiently ensured.

According to a second aspect of the present invention, there is provided a backflow suppressing means (28).
Is materialized. That is, claim 1
In the refrigeration apparatus described above, the backflow suppressing means (28) is
From (24) toward the gas-liquid separator (4), an enlarged portion (28a) for gradually increasing the flow path diameter of the injection passage (10a, 23b) and a contraction section (28b) for rapidly reducing the flow path diameter. It is composed of a plurality of fluid diodes alternately arranged.

According to this specific matter, a structure for suppressing the backflow of the refrigerant can be obtained only by changing the flow path diameter of the injection passage (10a, 23b), and a separate means for suppressing the backflow is provided. No need.

According to a third aspect of the present invention, a backflow suppressing means (28) is provided.
The member that provides the is specified. That is, in the refrigeration apparatus according to the first aspect, the upper end of the gas-liquid separator (4) and the compressor (1) are connected by the injection pipe (10). The backflow suppressing means (28) is provided in the internal passage (10a) of the injection pipe (10).

According to this particular matter, the backflow suppressing means (28) is provided for the injection pipe (10) which is relatively easy to process, so that the practical use of the backflow suppressing means (28) can be easily achieved. .

According to a fourth aspect of the present invention, a backflow suppressing means (28)
The position of the arrangement is specified. That is, in the refrigeration apparatus according to claim 3, the injection pipe (10)
An open / close valve (11) that can be opened and closed when the gas refrigerant of the gas-liquid separator (4) is introduced into the compressor (1) is provided. A backflow suppressing means (28), an on-off valve (11) in the injection pipe (10);
Rather than the compressor (1).

According to this specific matter, the backflow suppressing means (28)
As much as possible in the injection pipe (10)
(1) can be provided at a position close to (1), and the effect of suppressing the backflow of the gas refrigerant can be sufficiently obtained.

According to a fifth aspect of the present invention, the structure of the compressor is embodied, and the position of the backflow suppressing means (28) in the structure is optimized. That is, in the refrigeration apparatus according to claim 1, the compressor (1) is a rotary compressor. That is, the rotor (21) is placed in the cylinder (20).
And the heads (22,
23) is provided to form a compression chamber (24) between the inner peripheral surface of the cylinder (20) and the outer peripheral surface of the rotor (21). The rotor (21) is
It is eccentric with respect to the cylinder (20), and is rotated while making a part of the outer peripheral surface thereof substantially contact the inner peripheral surface of the cylinder (20). Thereby, the compression chamber (24) is contracted to compress the fluid in the compression chamber (24). In addition, the head section (23)
A communication passage for communicating the injection chamber (24) with the injection pipe (10) connecting the gas-liquid separator (4) and the compressor (1) to each other.
(23b) is formed. Further, a backflow suppressing means (28) is provided in the communication path (23b).

According to this particular matter, it becomes possible to provide the backflow suppressing means (28) immediately upstream of the compression chamber (24) of the rotary compressor, so that the backflow of the gas refrigerant to the injection pipe (10) is almost completely prevented. Can be eliminated.

[0019]

Embodiments of the present invention will be described below with reference to the drawings. In this embodiment, a case where the refrigeration apparatus according to the present invention is applied to an air conditioner will be described.

(First Embodiment) First, a first embodiment will be described.

-Explanation of Refrigerant Circuit- As shown in FIG. 1, the main refrigerant circuit (8) of the air conditioner according to the present embodiment is of a heat pump type and has a compressor.
(1), four-way switching valve (2), outdoor heat exchanger (3), first motor-operated valve (EV
-1), gas-liquid separator (4), second motor-operated valve (EV-2), indoor heat exchanger
(5) An accumulator (6) is connected by a refrigerant pipe (7).

The four-way switching valve (2) can switch the connection state of each heat exchanger (3, 5) to the discharge side and the suction side of the compressor (1). That is, when the four-way switching valve (2) is switched to the solid line side in the figure, the discharge side of the compressor (1) is connected to the outdoor heat exchanger (3), and the suction side is connected to the indoor heat exchanger (5). Then, the indoor cooling operation becomes possible. On the other hand, when the four-way switching valve (2) is switched to the broken line side in the figure, the discharge side of the compressor (1) is connected to the indoor heat exchanger (5), and the suction side is connected to the outdoor heat exchanger (3). Thus, the heating operation of the room is enabled.

The upper end of the gas-liquid separator (4) and the compressor (1) are connected by an injection pipe (10). The injection pipe (10) is provided with an injection valve (11) that is controlled to open and close. The injection valve (11) is opened when the gas refrigerant in the gas-liquid separator (4) is introduced (injected) into the compressor (1).

Accordingly, when the injection valve (11) is opened during the cooling operation and the gas injection operation is performed, the gas refrigerant is prevented from being introduced into the indoor heat exchanger (5), and the indoor heat exchange is prevented. The amount of heat exchange of the refrigerant evaporated in the vessel (5) can be increased, and the cooling capacity can be improved. On the other hand, when the gas injection operation is performed during the heating operation, the flow rate of the refrigerant flowing through the indoor heat exchanger (5) serving as a condenser increases without increasing the capacity (operating frequency, etc.) of the compressor, thereby increasing the heating capacity. It can be improved.

-Description of Compressor- Next, the configurations of the compressor (1) and the injection pipe (10), which are features of the present invention, will be described. As shown in FIGS. 2 and 3 (only the compression mechanism of the compressor is shown), the compressor (1) according to the present embodiment is of a rotary piston type. Hereinafter, the compression mechanism of the compressor (1) will be described.
The compression mechanism portion is disposed at a lower portion in the compressor casing (15), and a rotational driving force of an electric motor (not shown) disposed at an upper portion in the casing (15) is transmitted through a crankshaft (16). The data is transmitted to perform a predetermined compression operation.

The compression mechanism will be described in detail. A cylindrical cylinder (20) fixed to the inner wall of the compressor casing (15), and a rotor housed in the cylinder (20)
(21) is provided. A front head (22) is mounted on the upper end surface of the cylinder (20), and a rear head (23) is mounted on the lower end surface.The inner peripheral surface of the cylinder (20) and the rotor are Compression chamber between the outer peripheral surface of (21)
(24) is formed. In addition, each of these heads (22, 23)
At the center of the through hole are formed through holes (22a, 23a) having a diameter substantially the same as the diameter of the crankshaft (16) and extending in the vertical direction, and the crankshaft (16) is inserted into these through holes (22a, 23a). It is rotatably supported. Further, a suction port (20a) is formed in the cylinder (20) as a suction path for a refrigerant opening to the compression chamber (24), and the suction port (20a) has a suction pipe (20) extending from the accumulator (6). 7a) is connected.

On the other hand, in the crankshaft (16), the rotor (21)
A cam portion (16a) which is eccentric in a predetermined direction with respect to the axis of the crankshaft (16) is formed integrally with a portion located inside the camshaft (16). The outer diameter of this cam part (16a) is
The cam portion (16a) is inserted substantially into the rotor (21). Thereby, the rotor (21)
Is provided eccentrically with respect to the cylinder (20), and the rotor (2
Part of the outer peripheral surface of 1) is substantially in contact with the inner peripheral surface of the cylinder (20).

Further, the suction port (2
0a), a blade groove (20b) extending in the radial direction of the cylinder (20) is formed near the disposition position, and the blade groove (20b)
A blade (25) is disposed in the compression chamber (24) so as to be freely retractable. The outer end of the blade groove (20b) faces the internal space of the casing (15), and the tip of the blade (25) is rotated by the pressure of the refrigerant gas acting on the rear end surface.
(21), the compression chamber (24) can be partitioned into a high-pressure chamber (24a) and a low-pressure chamber (24b) (FIGS. 4 and 5).
reference).

Further, a discharge port (not shown) is provided on the high pressure chamber side near the position where the blade (25) is disposed.
One end of the discharge port is opened on the inner peripheral surface of the cylinder (20), and a reed valve (not shown) that can be opened in response to a rise in the pressure in the high-pressure chamber is provided in this opening.
On the other hand, the other end of the discharge port is open to the internal space of the casing (15). Thereby, during operation of the compressor (1), the internal space of the casing ((15) is always kept at a high pressure.

A discharge pipe (not shown) connected to the four-way switching valve (2) is connected to the upper surface of the casing (15). The high-temperature and high-pressure refrigerant discharged from the compressor (1) to the discharge pipe is The liquid is led to a heat exchanger serving as a condenser via a four-way switching valve (2). With such a configuration, the compressor (1)
When the crankshaft (16) rotates, the
((21) rotates in the cylinder (20) to contract the compression chamber (24).

And, the above-mentioned injection tube (10)
Penetrates the casing (15) of the compressor (1) and the rear head (2
3) is inserted. The rear head (23) is provided with a communication hole (23b) for communicating the opening at the tip of the injection pipe (10) with the compression chamber (24). Thereby, the internal passage (10a) of the injection pipe (10) and the communication hole
(23b) constitutes an injection passage through which the injection gas flows inside the injection pipe (10).
(10a) and through the communication hole (23b) to be introduced into the compression chamber (24).

The opening position of the communication hole (23b) with respect to the compression chamber (24) is such that the lower end surface of the rotor (21) is closed when the rotation angle of the rotor (21) is greater than a predetermined angle. Is set to That is, in the state shown in FIG. 3 (rotor rotation angle = 0 °) or the state shown in FIG. 4 (rotor rotation angle = 90 °), at least a part of the downstream end of the communication hole (23b) is at least partially compressed. (24), and as shown in FIG. 5, when the rotor rotation angle reaches, for example, 140 °, the rotor (21) covers and closes the downstream end of the communication hole (23b). I have. In other words, the communication hole (23b) is closed by the rotor (21) when the high-pressure chamber (24a) is at a relatively high pressure.

The location of the communication hole (23b) may be the front head (22) or both the front head (22) and the rear head (23).

The feature of this embodiment resides in the structure inside the injection pipe (10). As shown in FIG. 2, the injection pipe (10)
A portion (downstream of the compression chamber) downstream of the injection valve (11) is formed as a backflow suppressing portion (28) as backflow suppressing means for increasing or decreasing the inner diameter of the pipe. In other words, the internal passage (10a) of the injection pipe (10) in this portion is provided with an enlarged portion (28a) whose flow path diameter gradually increases from the downstream side (compression chamber side) to the upstream side (gas-liquid separator side). , And the contraction portion (28b) in which the flow path diameter rapidly decreases is formed alternately and continuously. Thereby, the operation of reducing the pressure of the gas refrigerant that is going to flow backward from the downstream side toward the upstream side in the expansion section (28a) and increasing the pressure in the contraction section (28b) is alternately repeated. A pressure loss occurs with respect to the flow from the upstream to the upstream side, so that a large flow resistance acts. Conversely, there is almost no pressure loss for the flow from the upstream side to the downstream side, and there is almost no flow resistance. As described above, the injection pipe (1) has a function of allowing a smooth flow in one-way flow and providing a large flow resistance in a reverse direction flow.
0) is provided in the backflow suppression unit (28). That is, the backflow suppressing section (28) is configured to function as a so-called multi-stage fluid diode. The backflow suppressing portion (28) is manufactured by, for example, a lost wax method (investment casting).

-Compressor operation- Next, the operation of the compressor (1) configured as described above will be described. First, when the electric motor is driven, the driving force is applied to the crankshaft (16) and the cam portion (16) of the crankshaft (16).
a) to the rotor (21), which rotates in the cylinder (20). This allows the refrigerant gas to flow through the suction pipe (7
From a), it flows into the low pressure chamber (24b) via the suction port (20a).
Thereafter, as the rotor (21) rotates, the refrigerant gas is compressed as the low-pressure chamber (24b) becomes the high-pressure chamber (24a), and when the pressure of the refrigerant reaches a predetermined value, the pressure causes the reed valve to open. Then, the refrigerant gas in a high pressure state is discharged from the discharge port to the internal space of the casing (15), and thereafter, is discharged to the condenser side by a discharge pipe. In the operation of such a compressor (1), when the injection operation of the intermediate-pressure refrigerant is being performed, that is, when the injection valve (11) is open, the pressure in the compression chamber (24) is When the pressure is lower than the injection gas pressure (intermediate pressure), the intermediate pressure gas refrigerant separated by the gas-liquid separator (4) is introduced into the compression chamber (24) through the injection pipe (10) due to this differential pressure. Is done. At this time, since the flow resistance hardly occurs in the backflow suppressing portion (28) (fluid diode) in the injection pipe (10), this gas refrigerant is smoothly introduced into the compression chamber (24) and contributes to the improvement of the air conditioning capacity. I do.

On the other hand, as described above, even if the downstream end of the communication hole (23b) is set at a position where high pressure is suppressed, the pressure in the compression chamber (24) is maintained at the injection gas pressure (intermediate pressure). Still higher than the communication hole (23b)
, The downstream end may face the compression chamber (24) without being blocked by the rotor (21).
In this case, the refrigerant in the compression chamber (24) tends to flow back through the injection pipe (10) due to this differential pressure. However, a large flow resistance is given to the backflowing refrigerant by the action of the backflow suppressing portion (28) (fluid diode) in the injection pipe (10), so that the refrigerant flows from the compression chamber (24) to the injection pipe (10). Almost no backflow of the refrigerant. For this reason, the compression operation of the compressor (1) is performed favorably, and high compressor efficiency can be maintained.

As described above, according to the configuration of the present embodiment, while the backflow of the refrigerant from the compressor (1) to the gas-liquid separator (4) is suppressed, the compression from the gas-liquid separator (4) is suppressed. Flow resistance can be prevented from being given to gas injection toward the machine (1). For this reason, the improvement of the refrigerating capacity by the gas injection and the improvement of the compressor efficiency by the backflow prevention can be achieved at the same time, and the efficient operation of the entire apparatus can be performed.

(Second Embodiment) Next, a second embodiment of the present invention will be described. This example is a modification of the formation position of the backflow suppressing portion (28).
This is the same as the embodiment. Therefore, here, only the differences from the first embodiment will be described.

As shown in FIG. 6, the backflow suppressing portion (2
8) is formed in the communication hole (23b) of the rear head (23). That is, as in the case described above, the backflow suppressing portion (28) is configured by increasing or decreasing the inner diameter of the conduit of the communication hole (23b).

According to this configuration, since the backflow suppressing means (28) is provided immediately upstream of the compression chamber (24), the backflow of the gas refrigerant to the injection pipe (10) can be almost eliminated. In addition, the compressor efficiency can be more remarkably improved by preventing backflow.

(Third Embodiment) Next, a third embodiment of the present invention will be described. This embodiment is a case where the present invention is applied to a rotary piston type compressor (also called a swing compressor) in which a rotor (21) and a blade (25) are integrally formed.

As shown in FIG. 7, the compressor (1) according to the present embodiment differs from the compressor of each of the above-described embodiments in that the rotor (2)
1) and the blade (25) are integrally formed, and the rotor (21) revolves in the cylinder (20) to compress the refrigerant.

That is, a circular bush hole (32) for fitting the swinging bush (31) is provided near the suction port (20a). In the bush hole (32), a pair of swing bushes (31, 31) having a substantially semicircular cross section are arranged so as to be swingable. The tip side of the blade (25) is inserted between the swing bushes (31, 31). That is, the two swinging bushes (31, 31) are arranged so as to sandwich the tip side of the blade (25), and allow the blade (25) to move forward and backward in the bush hole (32). And, it is provided so as to swing in the bush hole (32) integrally with the blade (25).

In the compressor (1) configured as described above, the backflow suppressing part (28) is provided in the injection passage (10a, 23b) as in the first and second embodiments described above.
While suppressing the backflow of the refrigerant from the compressor (1) to the gas-liquid separator (4), it does not provide a flow resistance to the gas injection from the gas-liquid separator (4) to the compressor (1). You can do so.

In each of the above embodiments, the portion functioning as a fluid diode is provided downstream of the injection valve (11) in the injection pipe (10), but this portion is provided in the injection valve (11). It may be provided on the upstream side.

Further, although the injection gas is supplied at the lower part of the compression chamber (24), it may be supplied from the upper part. That is, an injection pipe is connected to the front head (22), and a communication hole for injection is formed in the front head (22). Further, the injection gas may be supplied from both sides of the front head (22) and the rear head (23).

[0047]

As described above, according to the present invention, the following effects are exhibited.

According to the first aspect of the present invention, in the refrigeration system for injecting the intermediate-pressure refrigerant into the compressor (1), the refrigerant is supplied from the gas-liquid separator (4) to the compression chamber (24) of the compressor (1). Backflow suppressing means (28) that does not provide resistance to the flow toward the compressor (1) and provides resistance to the backflow toward the gas-liquid separator (4) to the injection passage (10a, 23b) that ). Therefore, the improvement of the refrigerating capacity by the gas injection and the improvement of the compressor efficiency by the backflow prevention can be achieved at the same time, and the efficient operation of the entire apparatus can be performed.

According to a second aspect of the present invention, there is provided a backflow suppressing means (28).
Is composed of a fluid diode. Therefore, only by changing the flow path diameter of the injection passage (10a, 23b),
The configuration that suppresses the backflow of the refrigerant can be obtained, so that it is not necessary to provide a separate unit, and the effect of the invention described in claim 1 can be exerted without increasing the number of parts.

According to a third aspect of the present invention, there is provided a backflow suppressing means (28).
Is provided in the internal passage (10a) of the injection pipe (10) connecting the upper end of the gas-liquid separator (4) and the compressor (1).
For this reason, the backflow suppressing means (28) can be formed by relatively simple processing.
And the practicability of the backflow suppressing means (28) can be improved.

According to a fourth aspect of the present invention, a backflow suppressing means (28) is provided.
The compressor than the on-off valve (11) of the injection pipe (10).
(1) Provided on the side. Thereby, the backflow suppressing means (28)
As much as possible in the injection pipe (10)
(1) can be provided at a position close to (1), and the effect of suppressing the backflow of the gas refrigerant can be sufficiently exhibited.

According to a fifth aspect of the present invention, the compressor is configured as a rotary compressor, and the head section (22, 2
A communication path (23b) through which the injection gas flows is formed in 3), and a backflow suppressing means (28) is provided in the communication path (23b). Therefore, the backflow suppressing means (2) is located immediately upstream of the compression chamber (24).
8) can be provided, and the injection pipe (10)
Backflow of the gas refrigerant to the compressor can be almost eliminated, and the improvement of the compressor efficiency by preventing the backflow can be further remarkable.

[Brief description of the drawings]

FIG. 1 is a refrigerant circuit diagram of an air conditioner according to an embodiment.

FIG. 2 is a cross-sectional view illustrating a connection state of a compression mechanism portion and an injection pipe of the rotary piston compressor according to the first embodiment.

FIG. 3 is a sectional view of a compression mechanism at a position corresponding to line III-III in FIG. 2;

FIG. 4 is a diagram corresponding to FIG. 3, showing a case where the rotor rotation angle is 90 °.

FIG. 5 is a diagram corresponding to FIG. 3, showing a case where the rotor rotation angle is 140 °.

FIG. 6 is a cross-sectional view showing a backflow suppressing portion and a peripheral portion thereof according to a second embodiment.

FIG. 7 is a diagram corresponding to FIG. 3 in a third embodiment.

[Explanation of symbols]

 (1) Compressor (4) Gas-liquid separator (8) Main refrigerant circuit (10) Injection pipe (10a) Internal passage (injection passage) (11) Injection valve (20) Cylinder (21) Rotor (22) Front head (23) Rear head (23b) Communication hole (injection passage) (24) Compression chamber (28) Backflow suppression part (backflow suppression means)

Claims (5)

[Claims] A main refrigerant circulation circuit (8) including a compressor (1) and a gas-liquid separator (4), in which a refrigerant circulates so as to be able to carry heat, is separated by the gas-liquid separator (4). In a refrigerating apparatus having an injection passage (10a, 23b) for introducing a gas refrigerant into a compression chamber (24) of the compressor (1), the gas-liquid separator is provided in the injection passage (10a, 23b).
Backflow suppression that increases the flow path resistance for the gas refrigerant flowing backward from the compression chamber (24) toward the gas-liquid separator (4) than the flow path resistance for the gas refrigerant flowing from the (4) to the compression chamber (24) A refrigeration apparatus comprising means (28). 2. The refrigeration system according to claim 1, wherein the backflow suppressing means (28) gradually increases the flow path diameter of the injection passage (10a, 23b) from the compression chamber (24) toward the gas-liquid separator (4). A refrigeration apparatus comprising a fluid diode in which a plurality of enlarged portions (28a) for increasing the size and a plurality of contraction portions (28b) for rapidly reducing the diameter of the flow path are alternately arranged. 3. The refrigerating apparatus according to claim 1, wherein an upper end of the gas-liquid separator (4) and the compressor (1) are connected by an injection pipe (10), and a backflow suppressing means (28).
Is provided in the internal passage (10a) of the injection pipe (10). 4. The refrigeration apparatus according to claim 3, wherein the injection pipe (10) has an openable and closable valve that opens when the gas refrigerant of the gas-liquid separator (4) is introduced into the compressor (1). (11) is provided, and the backflow suppressing means (28) is provided closer to the compressor (1) than the on-off valve (11) in the injection pipe (10). 5. The refrigeration apparatus according to claim 1, wherein the compressor (1) has a rotor (21) housed in a cylinder (20) and a head part (22) on both end faces of the cylinder ((20)). ,twenty three)
Is provided, a compression chamber (24) is formed between the inner peripheral surface of the cylinder (20) and the outer peripheral surface of the rotor (21), and the rotor (21) is
The eccentricity with respect to the cylinder (20) causes a part of the outer peripheral surface to rotate while substantially contacting the inner peripheral surface of the cylinder (20), thereby contracting the compression chamber (24) and causing the inside of the compression chamber (24) to contract. A rotary compressor configured to compress a refrigerant of the type described above, wherein the head section (23) includes an injection pipe (10) that connects the gas-liquid separator (4) and the compressor (1) to each other. A refrigerating apparatus, wherein a communication path (23b) for communicating with the chamber (24) is formed, and the backflow suppressing means (28) is provided in the communication path (23b).