CN1148549C - Refrigeration system and capillary tube therefor - Google Patents
Refrigeration system and capillary tube therefor Download PDFInfo
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- CN1148549C CN1148549C CNB971262535A CN97126253A CN1148549C CN 1148549 C CN1148549 C CN 1148549C CN B971262535 A CNB971262535 A CN B971262535A CN 97126253 A CN97126253 A CN 97126253A CN 1148549 C CN1148549 C CN 1148549C
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- capillary
- refrigeration system
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- capillaceous
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Abstract
The present invention relates a refrigeration system and capillary tube having different cross section. The capillary tube includes at least a first part and a second part. The first part has a smaller cross section relative to that of the second part. Any impurity contained in the cryogen deposits automatically in the second part of the capillary tube according to the method, which may not block the capillary tube because the cross section increases.
Description
Technical field
The present invention relates to a kind of the refrigeration system of capillary as restraint device be related in particular to a kind of capillary, this capillary has different interior cross sections, blocks capillary with the impurity deposition that prevents refrigerant.
Background technology
Current refrigeration system is well-known.Typically, traditional refrigeration system comprises a series of continuous compressors, a condenser, a restraint device and an evaporimeter.Condenser links to each other with the gas outlet or the high-pressure side of compressor, and evaporimeter links to each other with the air inlet or the inlet side of compressor.Such as restraint device capillaceous condenser is linked to each other with evaporimeter.
Be in operation, compressor compresses one refrigerant also enters it in the condenser.When refrigerant liquid stream ran into capillary, it had been limited, thereby had caused the increase of refrigerant pressure in the condenser.When refrigerant that compressed, high pressure flow out capillary and flow into low pressure, during jumbo evaporimeter, the also evaporation of expanding of this refrigerant, thus caused the decrease of temperature in the evaporimeter.The refrigerant of this moment roughly is gaseous state, and it shifts to compressor then, is compressed and repeats this circulation once more at this refrigerant.In some system, capillary and the pipe that makes refrigerant be back to compressor weld together to form a heat exchanger [being commonly referred to vacuum line heat (lineheat) interchanger].This will improve the energy efficiency of refrigeration system.
A shortcoming of this process is to leave capillary and enter evaporimeter between the phase of expansion when refrigerant, and refrigerant fades to the state variation of gaseous state and the decline of its associated temperature has caused that contained impurity is deposited in the part of capillary near the junction of evaporimeter the refrigerant from liquid state.Time has been grown, and these deposits can cause going down of obstruction capillaceous and performance of refrigerant systems.When the novel refrigerant that uses such as R-134A (HFC), block impurity problem capillaceous bad luck more.The HFC system is especially fragile for the hydrocarbon impurities that may block airtight refrigeration system, particularly paraffin class (paraffin) impurity, thereby has caused fault.
Summary of the invention
Applicant's invention provides a kind of refrigeration system a kind of capillaceous that can overcome impurity obstruction capillary problem that has.The present invention solves this problem relevant with prior art by the capillary with different inner diameters or different internal cross section is provided, the capillary that is provided is deposited into the impurity in the refrigerant capillaceously to have in the larger-diameter part, thereby has prevented that effectively impurity from blocking capillary.
Specifically, the invention provides a kind of refrigeration system, comprising: one has the compressor of an air inlet and a gas outlet; One has the condenser of an air inlet and a liquid outlet, and the air inlet of this condenser links to each other with the gas outlet of compressor; One has the evaporimeter of an inlet and a gas outlet, and the gas outlet of this evaporimeter links to each other with the air inlet of compressor; An and capillary, its characteristics are, this capillary comprises an at least one first and a second portion, first has one first cross section and constitutes inlet capillaceous, second portion has one greater than second cross section of first cross section and constitute liquid outlet capillaceous, inlet capillaceous links to each other with the liquid outlet of condenser, and liquid outlet capillaceous links to each other with the inlet of evaporimeter, and the ratio of second cross section and first cross section is more than or equal to 1.2 and smaller or equal to 2.0.
Description of drawings
Fig. 1 is the schematic diagram of refrigeration system of the present invention.
Figure 2 shows that first embodiment capillaceous of refrigeration system of the present invention.
Fig. 3 is a capillary 3-3 side cross sectional view along the line shown in Figure 2.
Fig. 4 is second embodiment capillaceous of the present invention.
Fig. 5 is the 3rd embodiment capillaceous of the present invention.
Fig. 6 is the 4th embodiment capillaceous of the present invention.
Fig. 7 is the line 7-7 side cross sectional view along Fig. 6.
The specific embodiment
Figure 1 shows that a kind of refrigeration system 10 of the present invention.This refrigeration system 10 comprises a compressor 12 that links to each other with a condenser 14 and an evaporimeter 16.This condenser 14 is linked to each other by a capillary 18 of the present invention with evaporimeter 16.During kind of refrigeration cycle, refrigerant is from compressor 12 flow through condenser 14, capillary 18, and inflow evaporator 16 is sucked compressor 12 to repeat this circulation again at this refrigerant.
Can see that from describe this refrigeration system 10 in more detail this compressor 12 has an air inlet 20 on its low-pressure side or its suction surface, and has a gas outlet 22 on its high-pressure side.This condenser 14 has an air inlet 24 that links to each other with the gas outlet of compressor and a condenser liquid outlet 26.This evaporimeter has an evaporimeter gas outlet 28 that links to each other with the air inlet 20 of compressor and an evaporimeter inlet 30.This capillary 18 has an inlet 32 and a liquid outlet 34.This capillary inlet 32 links to each other with condenser liquid outlet 26, and this capillary liquid outlet links to each other with evaporimeter inlet 30, thereby has finished the flow channel of refrigerant in this refrigeration system 10.
At the run duration of this refrigeration system, compressor is drawn into from evaporimeter and is the refrigerant of gaseous state this moment, then compresses this refrigerant, and it is injected condenser 14.When the refrigerant of compression injected condenser by compressor 12, the refrigerant of compression can run into capillary 18, and this capillary has the interior cross section more much smaller than the interior cross section of condenser 14 and evaporimeter 16.The capillary small cross section has caused from the liquid flow restriction of the refrigerant of the compression of condenser 14 inflow evaporators 16, has formed high pressure thus in condenser 14 relatively.When the refrigerant of pressurization during from capillary 18 inflow evaporators, it expands in low pressure, jumbo evaporation tube, thereby has caused decrease of temperature.In the former design, decrease of temperature occurs on the tie point of capillary and evaporimeter approx.In the former design, because evaporimeter and intercapillary heat conduction, and the influence of the ascending air of the gas in the evaporimeter near the refrigerant of the compression the tie point of capillary and evaporimeter, can take place or the beginning decrease of temperature near the capillary portion evaporimeter.
With refrigerant from liquid state fade to problem that the state variation of gaseous state is associated be in the state variation of refrigerant during the gaseous state, the impurity of before carrying secretly in the refrigerant of liquid state has been with from solution.These impurity are deposited on the refrigeration system that is arranged in temperature drop point place, and in the former design, this temperature descends and usually occurs on the tie point of capillary and evaporimeter, so these impurity can cause obstruction capillaceous.In history, the deposition of the impurity in the refrigeration system can not cause that the refrigeration system of use CFC refrigerant is out of order.Impurity in the CFC system can be remained in the solution by refrigerant usually.Yet, such as the more novel refrigerant of HFC (R-134A) be easier to disengage or be settled out may block capillaceous such as hydrocarbon impurities, especially paraffin class impurity.If there is 20 to 50mg impurity in closed system, then this HFC system can be out of order usually.
The ratio (transition ratio) of definite second cross section and first cross section is greater than at least and equals 1.2, to guarantee the having impurity that anticipated number contained in the capacity refrigerant is come in enough spaces in second portion.In the HFC system, may contain the impurity more than the 500mg.Test shows that the present invention can allow to contain so many impurity in the refrigerant and system is out of order.In addition, this transition ratio is less than and equals 2.0, can not become the extension of evaporimeter to guarantee second portion capillaceous, otherwise counteracting be had the capillaceous favourable part of different area.
Total length capillaceous of the present invention approaches seven to ten feet.Yet this length changes along with specific purposes.About length of 50% to 70% is made up of first, and the remainder of this length is made up of second portion.For the purposes of the present invention, importantly the length of second portion can influence the performance of the impurity of anticipated number in the capillary capacity refrigerant sharply.
Fig. 2 and Figure 3 shows that first embodiment capillaceous of the present invention.The capillary 36 of first embodiment comprises that one has the outer tube 38 and a wire 42 that is installed in the outer tube 38 of fixed inner diameter 40.This wire 42 has diameter 44.
This wire roughly extends towards liquid outlet 34 capillaceous from inlet 32 capillaceous, and installs on the throne by the serpentine configuration of capillary 18.This wire 42 does not run through the whole length of capillary 18.The first of capillary 18 has part wiry by capillary 18 and limits, and does not limit and second portion capillaceous does not have part wiry by capillary 18.Place the cross section that a wire 42 can reduce capillary first effectively in the capillary.So, exist a transition the cross section of the capillary second portion on 42 termination from first capillaceous to wire.
Figure 4 shows that second embodiment of capillary 18 of the present invention.In second embodiment, capillary 18 comprises a single-piece outer tube 50, and this outer tube has first 52 and second portion 54.First 52 has an internal diameter, and this internal diameter wants littler with respect to the internal diameter of second portion 54, thereby makes first 52 have cross section less than second portion 54.First 52 has formed a transition point with the tie point of second portion 54.This outer tube 50 as shown in the figure, under situation about having with the corresponding different external diameter of different internal diameters, it has a fixing pipe thickness.Yet outer tube has with the not corresponding fixing external diameter of different internal diameters and also will drop in the scope of the present invention.
Figure 5 shows that the 3rd embodiment capillaceous of the present invention.The 3rd embodiment comprises first outer tube 60 and second outer tube 62.First outer tube has the internal diameter that the internal diameter than second outer tube comes for a short time.First and second outer tubes are connected by a joint 64 (braised joint).
Fig. 6 and Figure 7 shows that the 4th embodiment capillaceous of the present invention.The 4th embodiment comprises an outer tube 70, and its outer dia is originally constant.Yet the first 72 of this outer tube 70 is rolled to reduce the interior cross section of first 72.Second portion 74 is not rolled, and has the cross section greater than first 72.
The present invention provides a kind of simple solution for the associated problem of novel refrigerant that contains a large amount of relatively impurity.Because the capillary of available minimum length provides desired restriction, so the present invention preferably uses the single-piece capillary with large diameter.For the single-piece capillary that uses large diameter provides desired restriction, the length of overlength will be needed.The length of this overlength can suppress to use the vacuum line heat exchanger with capillary in the system that improves system effectiveness and the heat exchange between the vacuum line (suction line).
From many different embodiment, as can be seen, can different ways constitute capillary of the present invention.The present invention is not subjected to the restriction of ad hoc structure as shown in the figure.
Claims (7)
1. refrigeration system comprises:
One has the compressor of an air inlet and a gas outlet;
One has the condenser of an air inlet and a liquid outlet, and the air inlet of described condenser links to each other with the gas outlet of described compressor;
One has the evaporimeter of an inlet and a gas outlet, and the gas outlet of described evaporimeter links to each other with the air inlet of described compressor; And
One capillary,
It is characterized in that, described capillary comprises an at least one first and a second portion, described first has one first cross section and constitutes inlet capillaceous, described second portion has one greater than second cross section of first cross section and constitute liquid outlet capillaceous, described inlet capillaceous links to each other with the liquid outlet of described condenser, described liquid outlet capillaceous links to each other with the inlet of described evaporimeter, and the ratio of described second cross section and described first cross section is more than or equal to 1.2 and smaller or equal to 2.0.
2. refrigeration system as claimed in claim 1 is characterized in that, described first and second portion have comprised described whole length capillaceous.
3. refrigeration system as claimed in claim 2 is characterized in that, described second portion constitutes the capillary less than 1/2nd length.
4. refrigeration system as claimed in claim 1 is characterized in that, described capillary comprises that also one is placed in the capillary to determine the wire of the first and first cross section.
5. refrigeration system as claimed in claim 1 is characterized in that, described capillary comprises that one has the single type pipe of two discontinuous parts determining described first and second parts.
6. refrigeration system as claimed in claim 1 is characterized in that, described capillary comprises two independent pipes that link together at least, and a pipe has been determined first, and second pipe determined second portion.
7. refrigeration system as claimed in claim 1 is characterized in that, described capillary comprises that one has the single tube that the rolling part and of having determined first has been determined the standard part of second portion.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US3441297P | 1997-01-02 | 1997-01-02 | |
| US60/034412 | 1997-01-02 | ||
| US60/034,412 | 1997-01-02 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1186936A CN1186936A (en) | 1998-07-08 |
| CN1148549C true CN1148549C (en) | 2004-05-05 |
Family
ID=34392800
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB971262535A Expired - Fee Related CN1148549C (en) | 1997-01-02 | 1997-12-31 | Refrigeration system and capillary tube therefor |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1148549C (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104344617A (en) * | 2013-07-26 | 2015-02-11 | 中科美菱低温科技有限责任公司 | Self-washing mechanism for ultra-low temperature freezer |
-
1997
- 1997-12-31 CN CNB971262535A patent/CN1148549C/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| CN1186936A (en) | 1998-07-08 |
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