JP2008008577A - Refrigerating cycle - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a refrigerating cycle capable of suppressing mixing of a gaseous phase refrigerant in a refrigerant flowing from a liquid tank to a downstream side. <P>SOLUTION: A negative pressure generating means 10 for generating a negative pressure in a passing cooling is provided in the middle of a refrigerant circulation path 6 from a compressor 2 to the liquid tank 7, and an upper part of the liquid tank 7 is communicated with the negative pressure generating means 10 by a capillary tube 20. By this, by sucking gaseous phase refrigerant accumulated in the upper part of the liquid tank 7 into the negative pressure generating means 10 via the capillary tube 20, the gaseous phase refrigerant remaining in the liquid tank 7 is reduced, and an amount of the gaseous phase refrigerant to be mixed into the liquid phase refrigerant flowing from the liquid tank 7 to an expansion valve 4 and an evaporator 5 can be suppressed. As a result, deterioration of cooling performance due to the evaporator 5 can be suppressed. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a refrigeration cycle including a liquid tank for gas-liquid separation.

  Generally, in the refrigeration cycle, the refrigerant pressurized by the compressor is cooled by a condenser and liquefied, and the liquefied refrigerant is vaporized at a low temperature by an expansion valve and passed through an evaporator, so that the refrigerant passing through the evaporator and the outside of the evaporator are separated. Heat is exchanged with the air that is ventilated to obtain cooled air.

At this time, a liquid tank is provided in order to remove the gas-phase refrigerant from the refrigerant liquefied by the condenser, and the liquid-phase refrigerant is separated by gas-liquid separation in this liquid tank, that is, on the downstream side of the liquid tank, that is, the expansion valve and the evaporator. It supplies in order (for example, refer patent document 1).
JP 2002-323274 A

  However, in the conventional refrigeration cycle, when the refrigerant passes through the liquid tank, not only the liquid-phase refrigerant but also the gas-phase refrigerant is discharged as it is to the downstream expansion valve and evaporator along the refrigerant flow. There is. Thus, the more the amount of gas-phase refrigerant supplied to the expansion valve and the evaporator, the lower the cooling performance of the evaporator.

  Therefore, the present invention provides a refrigeration cycle capable of reducing the amount of gas-phase refrigerant discharged to the downstream side of the liquid tank.

  The invention according to claim 1 is a refrigeration cycle, wherein a negative pressure generating means provided in the middle of a refrigerant circulation path from a compressor of the refrigeration cycle to a liquid tank, an upper portion of the liquid tank, and the negative pressure generating means And a communication path that communicates with each other.

  A second aspect of the present invention is the refrigeration cycle according to the first aspect, wherein the negative pressure generating means is a throttle portion that reduces a cross-sectional area of the refrigerant circulation path.

  The invention of claim 3 is the refrigeration cycle according to claim 1 or 2, characterized in that a check valve for blocking the flow of refrigerant from the negative pressure generating means to the liquid tank is provided in the communication path. To do.

  A fourth aspect of the present invention is the refrigeration cycle according to any one of the first to third aspects, wherein the negative pressure generating means is fixed to a capacitor.

  A fifth aspect of the present invention is the refrigeration cycle according to any one of the first to third aspects, wherein the negative pressure generating means is formed in a header tank of a condenser.

  A sixth aspect of the present invention is the refrigeration cycle according to any one of the first to fourth aspects, wherein the liquid tank is fixed to one of a pair of header tanks of the condenser and the negative pressure is generated. The means is arranged in the vicinity of the header tank to which the liquid tank is fixed.

  The invention of claim 7 is the refrigeration cycle according to any one of claims 1 to 6, wherein an upper portion of the liquid tank covers the opening to the communication path, and the liquid phase to the communication path. A filter for blocking the passage of the refrigerant is provided.

  According to the first aspect of the present invention, the negative pressure generating means provided in the refrigerant circulation path from the compressor to the liquid tank communicates with the upper part of the liquid tank through the communication path, so that the gas phase accumulated in the upper part of the liquid tank. Since the refrigerant can be sucked by the negative pressure generating means through the communication path, the gas-phase refrigerant is reduced in the liquid-phase refrigerant discharged from the liquid tank to the expansion valve and the evaporator by reducing the gas-phase refrigerant remaining in the liquid tank. The amount to be mixed can be suppressed, and as a result, the deterioration of the cooling performance by the evaporator can be suppressed.

  In the present invention, the “refrigerant circulation path from the compressor to the liquid tank” means not only piping connecting the respective components from the compressor to the liquid tank but also components (for example, between the compressor and the liquid tank). Capacitor).

  According to the second aspect of the present invention, in addition to the effect of the first aspect, the negative pressure generating means is a constricted portion that reduces the cross-sectional area of the refrigerant circulation path. Can be simplified and the cost can be kept low.

  According to the third aspect of the invention, in addition to the effects of the first and second aspects, a check valve is provided in the communication path so as to block the refrigerant flow in the liquid tank direction from the negative pressure generating means. It is possible to prevent the high-temperature and high-pressure refrigerant discharged from the refrigerant from flowing into the liquid tank through the communication path by shortcutting the condenser.

  According to the invention of claim 4, in addition to the effects of claims 1 to 3, since the negative pressure generating means is fixed to the capacitor, the negative pressure generating means can be assembled simultaneously with the assembly of the capacitor. Is easy to handle.

  According to the invention of claim 5, in addition to the effects of claims 1 to 3, since the negative pressure generating means is formed in the header tank of the capacitor, the negative pressure generating means is disposed outside the capacitor. Therefore, the refrigeration cycle can be made compact.

  According to the sixth aspect of the present invention, in addition to the effects of the first to fourth aspects, when the liquid tank is fixed to one of the pair of header tanks of the capacitor, the negative pressure generating means is the liquid tank. Since the communication path that connects the liquid tank and the negative pressure generating means can be shortened, the layout when installing the refrigeration cycle can be simplified and the refrigeration cycle can be made compact. Can be

  According to the seventh aspect of the present invention, in addition to the effects of the first to sixth aspects, the filter is provided on the upper part of the liquid tank so as to cover the opening of the communication path. Therefore, the liquid-phase refrigerant in the liquid tank can be prevented from entering the communication path.

  Hereinafter, an embodiment of the present invention will be described with reference to the drawings.

  1 to 4 show a first embodiment of a refrigeration cycle according to the present invention, FIG. 1 is a system diagram schematically showing the basics of the refrigeration cycle of the present invention, and FIG. 2 is attached with a liquid tank and negative pressure generating means. FIG. 3 is a sectional view of the ejector, and FIG. 4 is a sectional view of the upper part of the liquid tank.

  The refrigeration cycle 1 of the present embodiment includes a compressor 2 that pressurizes the refrigerant as shown in FIG. 1, a condenser 3 that is provided downstream of the compressor 2 and that cools and liquefies the refrigerant pressurized by the compressor 2, and the condenser The expansion valve 4 provided downstream of the refrigerant 3 is adiabatically expanded to evaporate the refrigerant liquefied by the condenser 3 and is vaporized at low temperature by the expansion valve 4. The refrigerant discharged from the compressor 2 passes through the refrigerant circulation path 6 in the order of the condenser 3, the expansion valve 4, and the evaporator 5, and then returns to the compressor 2.

  Further, the refrigeration cycle 1 is provided with a liquid tank 7 that gas-liquid separates the refrigerant liquefied by the condenser 3 and supplies the refrigerant to the expansion valve 4.

  The capacitor 3 is composed of a main capacitor 3a and a sub capacitor 3b, and the liquid tank 7 is disposed between the main capacitor 3a and the sub capacitor 3b, and the refrigerant discharged from the main capacitor 3a is gas-liquid. After the separation, the sub-capacitor 3b is supplied. That is, the refrigerant cooled by passing through the main condenser 3a is further cooled by the sub condenser 3b, whereby the cooling efficiency of the refrigerant by the entire condenser 3 can be increased.

  Here, in the middle of the refrigerant circulation path 6 from the compressor 2 to the liquid tank 7 (in the middle of the pipe connecting the compressor 2 and the condenser 3 in this example), negative pressure generating means 10 for generating negative pressure in the refrigerant passing therethrough is provided. In addition, a capillary tube 20 is provided as a communication path for communicating the negative pressure generating means 10 and the upper portion of the liquid tank 7. As a result, the gas-phase refrigerant accumulated in the upper part of the liquid tank 7 is sucked into the negative pressure generating means 10 through the capillary tube 20.

  Next, the configuration of the capacitor, the liquid tank, and the negative pressure generating means and the connection structure thereof will be described more specifically with reference to FIGS.

  As specifically shown in FIG. 2, the capacitor 3 includes a main capacitor 3 a and a sub capacitor 3 b that are integrally coupled, and a pair of header tanks 31 and 32 that are arranged on both the left and right sides, and the header tank 31. , 32, and a plurality of tubes 34 that are arranged in parallel by communicating a pair of header tanks 31, 32 in the same manner as a general heat exchanger. Corrugated fins 35 attached between each adjacent tube 34 are provided.

  One header tank 31 is divided into a first tank chamber 37a, a second tank chamber 37b, and a third tank chamber 37c from above by a first partition plate 36a and a second partition plate 36b. At the same time, the other header tank 32 has a fourth tank chamber 37d, a fifth tank chamber 37e, and a sixth tank chamber 37f from above by the third partition plate 36c and the fourth partition plate 36d. And is defined.

  The first partition plate 36a is positioned above the third partition plate 36c, the third partition plate 36c is positioned above the second partition plate 36b, and the second partition plate 36b. And the fourth partition plate 36d are provided at the same position.

  The first capacitor chamber 3a is constituted by the first tank chamber 37a, the second tank chamber 37b, the fourth tank chamber 37d, the fifth tank chamber 37e, and the corresponding core portion 33, while The sub-capacitor 3b is configured by the third tank chamber 37c and the sixth tank chamber 37f, and the core portion 33 corresponding thereto.

  In the main condenser 3a, the refrigerant introduced into the first tank chamber 37a from the refrigerant circulation path 6 on the inlet side passes through the core portion 33 corresponding to the first tank chamber 37a and enters the fourth tank chamber 37d. Then, it flows into the upper part, then passes from the lower part of the fourth tank chamber 37d in the same way through the core part 33 and flows into the upper part of the second tank chamber 37b, and from the lower part of the second tank chamber 37b. The high-temperature refrigerant that has passed through 33 and flows into the fifth tank chamber 37e and is pressurized by the compressor 2 during this time is cooled by exchanging heat with the air flowing through the fins 35 while passing through the core 33. .

  Here, the liquid tank 7 is coupled to the other header tank 32 via an inlet pipe 6a and an outlet pipe 6b, so that the liquid tank 7 is integrally fixed to the capacitor 3, and is located below the fifth tank chamber 37e. The refrigerant introduced into the liquid tank 7 through the inlet pipe 6a communicating with the gas is separated into gas and liquid and then discharged into the sixth tank chamber 37f through the outlet pipe 6b.

  In the sub-capacitor 3b, the refrigerant flowing from the liquid tank 7 into the sixth tank chamber 37f passes through the core portion 33 corresponding to the sixth tank chamber 37f and flows into the third tank chamber 37c. The third tank chamber 37c is supplied from the refrigerant circulation path 6e on the outlet side to the expansion valve 4 (see FIG. 1).

  The liquid tank 7 is generally formed in a cylindrical shape whose both ends are closed, and an inlet pipe 6a is communicated with a middle part of the liquid tank 7 and an outlet pipe 6b is communicated with a lower end part of the liquid tank 7, The refrigerant introduced from the inlet pipe 6a into the liquid tank 7 is once stagnated to separate the gas and liquid. The separated gas-phase refrigerant is stored in the upper end of the liquid tank 7, and the liquid-phase refrigerant is stored in the liquid tank. One end portion of the capillary tube 20 communicates with the upper end of the liquid tank 7 that is stored in the lower portion of the liquid tank 7 and in which the gas-phase refrigerant is stored.

  On the upper part of the liquid tank 7, as shown in FIG. 4, a desiccant 40 is provided as a filter that covers the opening 7a that communicates with the capillary tube 20 and blocks the passage of the liquid refrigerant.

  That is, the desiccant 40 is held on the upper end of the liquid tank 7 by being held by a holding plate 41 formed of a perforated plate, and the vapor phase refrigerant separated in the liquid tank 7 moves the porous portion of the holding plate 41. It passes through and enters the desiccant 40, passes through while being dried by the desiccant 40, and is discharged from the opening 7 a to the caprary tube 20.

  The other end of the capillary tube 20 communicates with the negative pressure generating means 10. In this embodiment, as shown in FIG. 3, the negative pressure generating means 10 is a throttle that restricts the cross-sectional area of the refrigerant circulation path 6. It is comprised by the ejector 11 as a part.

  As is generally known, the ejector 11 communicates the upstream pipe 6c of the refrigerant circulation path 6 with one end of a cylindrical main body part 11b provided with a smooth throttle part 11a, and the other end of the main body part 11b. The downstream side pipe 6d of the refrigerant circulation path 6 communicates with the part, and the throttle flow is introduced while the refrigerant flow introduced from the upstream side pipe 6c into the main body part 11b passes through the throttle part 11a and is discharged from the downstream side pipe 6d. A negative pressure is generated in the main body portion 11b upstream of the portion 11a.

  The other end of the capillary tube 20 is communicated with a negative pressure generating portion of the ejector 11, that is, within one end portion where the upstream tube 6c of the main body portion 11b is communicated.

  At this time, as shown in FIG. 2, the ejector 11 has the downstream pipe 6 d coupled to the first tank chamber 37 a of the header tank 31, whereby the ejector 11 is fixed to the capacitor 3.

  In addition, the capillary tube 20 is provided with a check valve 21 that blocks the refrigerant flow from the ejector 11 toward the liquid tank 7.

  With the above configuration, according to the refrigeration cycle 1 of the present embodiment, the negative pressure generating means 10 is provided in the refrigerant circulation path 6 from the compressor 2 to the main condenser 3a, and the negative pressure generating means 10 and the upper part of the liquid tank 7 are Is communicated by the capillary tube 20, the gas-phase refrigerant accumulated in the upper part of the liquid tank 7 is sucked by the negative pressure generating means 10 through the capillary tube 20, and the sucked gas-phase refrigerant is sucked from the main condenser 3a. Can also be returned to the upstream refrigerant circulation path 6.

  For this reason, it is possible to reduce the gas-phase refrigerant remaining in the liquid tank 7 and to prevent the gas-phase refrigerant from being mixed into the liquid-phase refrigerant flowing from the liquid tank 7 to the expansion valve 4 and the evaporator 5. As a result, the fall of the cooling performance by the evaporator 5 can be suppressed, and the noise generation by the expansion valve 4 can be suppressed.

  Further, in the present embodiment, the negative pressure generating means 10 is formed by the ejector 11 as a throttle portion that reduces the passage cross-sectional area of the refrigerant circulation path 6, so the configuration of the negative pressure generating means 10 is simplified and the cost is kept low. be able to.

  Further, since the checker valve 21 is provided in the capillary tube 20 to block the refrigerant flow from the negative pressure generating means 10 toward the liquid tank 7, the flow rate of the refrigerant circulating in the refrigeration cycle 1 increases. In addition, the high-temperature and high-pressure refrigerant discharged from the compressor 2 is prevented from flowing back into the liquid tank 7 from the capillary tube 20. As a result, the cooling performance by the evaporator 5 to which the refrigerant is supplied from the liquid tank 7 is improved. Can be secured.

  Furthermore, since the ejector 11 (negative pressure generating means 10) is fixed to the capacitor 3, it becomes possible to assemble the ejector 11 simultaneously with the assembly of the capacitor 3, and the handling during the assembly becomes easy.

  Further, since the desiccant 40 that functions as a filter is provided on the upper part of the liquid tank 7 so as to cover the opening of the capillary tube 20, the passage of the liquid refrigerant can be blocked by the desiccant 40. It is possible to prevent the liquid phase refrigerant from entering the capillary tube 20. For this reason, it is possible to prevent a loss that the refrigerant cooled by the condenser 3 returns from the liquid tank 7 to the refrigerant circulation path 6 on the upstream side of the condenser 3.

(Second Embodiment)
FIG. 5 shows a second embodiment of the present invention, in which the same components as those in the first embodiment are denoted by the same reference numerals and redundant description is omitted, and FIG. 5 shows the liquid tank and the negative pressure generating means. It is a front view of the attached capacitor | condenser.

  As shown in FIG. 5, the refrigeration cycle 1A of the present embodiment basically has the same configuration as the refrigeration cycle 1 of the first embodiment, and the capacitor 3 is composed of a main capacitor 3a and a sub capacitor 3b. The tank 7 is integrally fixed to the header tank 32 via an inlet pipe 6a communicating with the lower part of the fifth tank chamber 37e and an outlet pipe 6b communicating with the sixth tank chamber 37f.

  The upper portion of the liquid tank 7 loaded with the desiccant 40 is communicated with the negative pressure generating means 10 via the capillary tube 20. In particular, in this embodiment, the negative pressure generating means 10 is connected to the refrigerant circulation path 6. It is formed by an orifice 12 as a constricted portion that restricts the cross-sectional area of the passage.

  The orifice 12 is configured by providing an orifice plate 12c in which a small hole 12b is formed inside a cylindrical case 12a whose both ends are closed. The upstream case 6c communicates with one end of the cylindrical case 12a, and the cylindrical case A downstream pipe 6d is communicated with the other end of 12a, and a negative pressure is produced downstream at a flow rate that is accelerated when the refrigerant introduced into the cylindrical case 12a from the upstream pipe 6c passes through the small hole 12b of the orifice plate 12c. The capillary tube 20 communicates with the vicinity of the downstream side of the orifice plate 12c.

  Also in the present embodiment, the orifice 12 is connected to the downstream side pipe 6 d with the first tank chamber 37 a of the header tank 31, whereby the orifice 12 is fixed to the capacitor 3.

  Therefore, according to the refrigeration cycle 1A of the present embodiment, the same effects as those of the first embodiment can be obtained.

  Further, in the first embodiment, the negative pressure generating means 10 is configured by the ejector 11, but in the second embodiment, the negative pressure generating means 10 is configured by the orifice 12, so that, similarly to the first embodiment, The configuration of the negative pressure generating means 10 can be simplified and the cost can be kept low.

(Third embodiment)
6 and 7 show a third embodiment of the present invention, in which the same components as those of the embodiments are denoted by the same reference numerals and redundant description is omitted, and FIG. 6 is a liquid tank and generating negative pressure. FIG. 7 is a cross-sectional view of the upper part of the liquid tank.

  As shown in FIG. 6, the refrigeration cycle 1B of the present embodiment basically has the same configuration as that of the refrigeration cycle 1 of the first embodiment, and the capacitor 3 is configured by integrating the main capacitor 3a and the sub capacitor 3b. The liquid tank 7 is fixed integrally to the header tank 32 via an inlet pipe 6a communicating with the lower part of the fifth tank chamber 37e and an outlet pipe 6b communicating with the sixth tank chamber 37f. is there.

  The upper part of the liquid tank 7 communicates with the negative pressure generating means 10 via the capillary tube 20. In particular, in this embodiment, the negative pressure generating means 10 is formed in the header tank 32 of the capacitor 3.

  At this time, the liquid tank 7 is fixed to the other header tank 32 of the capacitor 3, and the negative pressure generating means 10 is formed in the other header tank 32 to which the liquid tank 7 is fixed. The negative pressure generating means 10 is disposed in the vicinity of the liquid tank 7.

  That is, the liquid tank 7 is fixed to one of the pair of header tanks 31, 32 of the capacitor 3 (the other header tank 32), and the negative pressure generating means 10 is located in the vicinity of the header tank 32 to which the liquid tank 7 is fixed. Will be placed.

  The negative pressure generating means 10 is formed by an orifice 13. The orifice 13 is constituted by attaching an orifice plate 13b having a small hole 13a so as to partition the other header tank 32, and the attachment position of the orifice plate 13b. Is a position corresponding to the first partition plate 36 a provided in one header tank 31.

  Therefore, the refrigerant flowing from the first tank chamber 37a through the core portion 33 and flowing into the upper portion of the fourth tank chamber 37d moves to the lower portion of the fourth tank chamber 37d while moving to the lower portion of the orifice plate 13b. It passes through the hole 13a. At that time, when passing through the small hole 13a, the flow velocity is increased and negative pressure is generated on the downstream side, and the capillary tube 20 is communicated in the vicinity of the downstream side of the orifice plate 13b.

  Also in this embodiment, a strainer 42 as a filter is provided on the upper part of the liquid tank 7.

  As shown in FIG. 7, the strainer 42 is formed of foam metal, is held by a holding plate 43 formed of a perforated plate, is loaded on the upper end of the liquid tank 7, and is separated from the liquid tank 7. The phase refrigerant passes through the porous portion of the holding plate 41 and enters the strainer 42, passes through the strainer 42, and is discharged from the opening portion 7 a to the capillary tube 20.

  With the above configuration, according to the refrigeration cycle 1B of the present embodiment, the same operational effects as those of the first embodiment can be obtained.

  In addition, according to the present embodiment, the negative pressure generating means 10 is provided in the vicinity of the header tank 32 to which the liquid tank 7 is fixed (in particular in the header tank 32 in this example). It becomes possible to arrange the tank 7 close to each other, the capillary tube 20 that communicates both of them can be shortened, and the layout when installing the refrigeration cycle 1B can be facilitated. Miniaturization can be achieved.

  Further, according to the present embodiment, the negative pressure generating means 10 (orifice 13) is formed in the header tank 32 of the condenser 3, so that the orifice 13 is not disposed outside the condenser 3 and the refrigeration cycle 1B. Compactness can be achieved.

  Note that the structure in which the negative pressure generating means 10 is disposed in the vicinity of the header tank 32 to which the liquid tank 7 is fixed is only the structure in which the negative pressure generating means 10 is disposed in the header tank 32 as in the third embodiment. Needless to say, a structure in which the negative pressure generating means 10 is arranged outside the header tank 32 as in the modification of FIG. 9 is also included.

(Fourth embodiment)
FIG. 8 shows a fourth embodiment of the present invention, in which the same components as those in the third embodiment are denoted by the same reference numerals and redundant description is omitted, and FIG. 8 shows the liquid tank and the negative pressure generating means. It is a front view of the attached capacitor | condenser.

  As shown in FIG. 8, the refrigeration cycle 1C of the present embodiment basically has the same configuration as the refrigeration cycle 1B of the third embodiment, and an orifice 13 is formed inside the other header tank 32 to which the liquid tank 7 is attached. However, in particular, this embodiment is different from the third embodiment in that an inlet pipe that communicates the liquid tank 7 with the fifth tank chamber 37e and an outlet pipe that communicates with the sixth tank chamber 37f. Are used as a connecting pipe 8.

  The connecting pipe 8 is vertically defined by a partition plate 8a having a plurality of pores, the upper passage is used as an inlet pipe, the lower passage is used as an outlet pipe, and the partition plate 8a is used as a main condenser. The connecting pipe 8 is coupled to the other header tank 32 by continuing to the fourth partition plate 36d that defines 3a and the sub capacitor 3b.

  In addition, the liquid tank 7 is continuously formed with a disk 7b at the lower part of the liquid tank 7 so as to be continuous with the partition plate 8a. The communication pipe 7c is passed through the disk 7b so that the upper and lower sides of the disk 7b communicate with each other.

  Therefore, the refrigerant that has flowed into the liquid tank 7 from the fifth tank chamber 37e via the passage above the connection pipe 8 passes through the communication pipe 7c and moves below the disk 7b, and the passage below the connection pipe 8 Into the sixth tank chamber 37f.

  Therefore, when the refrigerant passes through the passage above the connecting pipe 8 from the fifth tank chamber 37e, the heavy liquid phase refrigerant passes through the pores formed in the partition plate 8a of the connecting pipe 8. The liquid flows directly into the sixth tank chamber 37f without going through the liquid tank 7.

  The refrigerant introduced into the liquid tank 7 is stored in the liquid tank 7 and separated into a liquid-phase refrigerant and a gas-phase refrigerant, and the liquid-phase refrigerant passes through the communication pipe 7c due to the weight effect and is stored in the liquid tank 7. From the lower part, it passes through the passage below the connecting pipe 8 and flows into the sixth tank chamber 37f.

  Then, the liquid-phase refrigerant that has flowed into the sixth tank chamber 37f passes through the corresponding core portion 33 and flows into the third tank chamber 37c, and then from the refrigerant circulation path 6e on the outlet side (see FIG. 1).

  On the other hand, the gas-phase refrigerant remaining on the upper portion of the liquid tank 7 passes through the strainer 42 and is discharged from the opening 7 a to the capillary tube 20.

  With the configuration as described above, according to the fourth embodiment, in addition to the same effects as those of the third embodiment, the passage 8 communicating the capacitor 3 and the liquid tank 7 has a partition plate in which a plurality of holes are formed. The heavy liquid phase refrigerant that flows above the passage 8 passes through the hole of the partition plate 8a by its own weight, flows below the passage 8, and passes through the liquid tank 7. It will flow to the downstream (sub capacitor 3b) without. Therefore, compared with 3rd Embodiment, there exists an advantage which the circulation efficiency of the refrigerant | coolant of a refrigerating cycle improves.

  By the way, although the refrigerating cycle of this invention was demonstrated taking the example in the above-mentioned embodiment, various other embodiment can be employ | adopted in the range which is not restricted to these embodiments and does not deviate from the summary of this invention. For example, the case where the capacitor 3 is divided into the main capacitor 3a and the sub capacitor 3b and the liquid tank 7 is arranged between the divided capacitors 3a and 3b has been disclosed. Even in this case, the present invention can be applied by disposing a liquid tank downstream of the one capacitor.

1 is a system diagram schematically showing the basics of a refrigeration cycle in a first embodiment of the present invention. The front view of the capacitor | condenser which attached the liquid tank and the negative pressure generation means in 1st Embodiment of this invention. Sectional drawing of the ejector in 1st Embodiment of this invention. Sectional drawing of the liquid tank upper part in 1st Embodiment of this invention. The front view of the capacitor | condenser which attached the liquid tank and the negative pressure generation means in 2nd Embodiment of this invention. The front view of the capacitor | condenser which attached the liquid tank and the negative pressure generation means in 3rd Embodiment of this invention. Sectional drawing of the liquid tank upper part in 3rd Embodiment of this invention. The front view of the capacitor | condenser which attached the liquid tank and the negative pressure generation means in 4th Embodiment of this invention. The front view of the modification of the structure which provided the negative pressure generation means in the vicinity of the header tank which fixed the liquid tank.

Explanation of symbols

1, 1A, 1B, 1C, 1D Refrigeration cycle 2 Compressor 3 Condenser 4 Expansion valve 5 Evaporator 6 Refrigerant circulation path 7 Liquid tank 7a Opening portion 10 Negative pressure generating means 11 Ejector (throttle portion)
12, 13 Orifice (throttle part)
20 Capraly tube (communication route)
21 Check valve 31, 32 Header tank 40 Desiccant (filter)
42 Strainer (filter)

Claims (7)

A compressor (2), a condenser (3) downstream of the compressor, a liquid tank (7) in the middle or downstream of the condenser, an expansion valve (5) downstream of the condenser and the liquid tank, and the expansion valve An evaporator (5) downstream of the compressor and upstream of the compressor,
Negative pressure generating means (10) provided in the middle of the refrigerant circulation path (6) from the compressor (2) to the liquid tank (7);
A communication path (20) for communicating the upper part of the liquid tank (7) and the negative pressure generating means (10);
A refrigeration cycle comprising: The refrigeration cycle according to claim 1,
The refrigeration cycle, wherein the negative pressure generating means (10) is a throttle section (11, 12) that reduces a passage sectional area of the refrigerant circulation path (6). The refrigeration cycle according to claim 1 or 2,
A refrigeration cycle characterized in that a check valve (21) for blocking the flow of refrigerant from the negative pressure generating means (10) to the liquid tank (7) is provided in the communication path (8). The refrigeration cycle according to any one of claims 1 to 3,
A refrigeration cycle characterized in that the negative pressure generating means (10) is fixed to the condenser (3). The refrigeration cycle according to any one of claims 1 to 3,
The refrigeration cycle characterized in that the negative pressure generating means (10) is formed in a header tank (31, 32) of the condenser (3). The refrigeration cycle according to any one of claims 1 to 4,
The liquid tank (7) is fixed to one (32) of the pair of header tanks (31, 32) of the capacitor, and the negative pressure generating means is provided in the vicinity of the header tank (32) to which the liquid tank is fixed. A refrigeration cycle characterized by arranging (10). The refrigeration cycle according to any one of claims 1 to 6,
Filters (41, 42) that cover the opening (7a) to the communication path (20) and block the passage of the liquid refrigerant to the communication path (20) are provided on the upper part of the liquid tank (7). A refrigeration cycle characterized by that.

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