US20100300134A1

US20100300134A1 - Refrigerant distribution device for refrigeration system

Info

Publication number: US20100300134A1
Application number: US12/791,011
Authority: US
Inventors: Neng REN; Li Wang; Xiuping SU
Original assignee: Johnson Controls Building Efficiency Technology Wuxi Co Ltd; Johnson Controls Technology Co
Current assignee: Johnson Controls Building Efficiency Technology Wuxi Co Ltd; Johnson Controls Technology Co
Priority date: 2009-06-02
Filing date: 2010-06-01
Publication date: 2010-12-02
Also published as: CN101907376A; CN101907376B; EP2264384A1

Abstract

The invention provides a refrigerant distribution device for refrigeration system which is capable of improving heat exchange efficiency, comprising: an entering duct, a bottom cover plate, a core, a hollow cylinder, an upper cover plate and multi-branch ducts. The core is disposed in the space formed by the bottom cover plate, the cylinder and the upper cover plate, wherein a plurality of openings are distributed on the core. The refrigerant distribution device according to the invention is capable of realizing uniform distribution and allocation of refrigerant in refrigeration system, and improving heat exchange efficiency of the refrigeration system.

Description

CROSS-REFERENCE TO RELATED APPLICATION

This patent application claims priority to Chinese Patent Application No. 200910143947.7 filed Jun. 2, 2009.

FIELD OF THE INVENTION

The invention relates to a fluid distribution device, particularly relates to a refrigerant distribution device utilized in refrigeration system.

BACKGROUND OF THE INVENTION

To improve the heat exchange efficiency of refrigeration system, refrigerant distribution device is broadly used in prior refrigeration systems. As shown in FIG. 1, it is a conventional heat pump air-conditioning system. The system mainly comprises following components: a compressor 7, a duct 6, a four-way reversing valve 13, a multipieces (more than two pieces) heat exchanger 5, a fan 4, a small distributor 2, a capillary 3, a principal distributor 1, a thermal expansion valve 11, a temperature sensing bulb 12, a drier filter 10, a heat exchanger 9 and a gas-liquid separator 8.
When the units operate at the heat pump condition, the high temperature and high pressure refrigerant gas exhausted by the compressor 7 enters into the heat exchanger 9 via the duct 6 and the four-way reversing valve 13; after making a heat exchange with cooling water in the heat exchanger 9, the refrigerant turns into high temperature and high pressure refrigerant liquid, get throttled in the thermal expansion valve 11 via the duct 6 and the drier filter 10, then becomes low temperature and low pressure gas-liquid two phases state and enters the principal distributor 1, distributed to the small distributor 2 of each heat exchanger by the principal distributor 1, and enters into each heat exchanger 5 via the capillary 3 of small distributor 2; by the rotation of fan 4, the refrigerant in heat exchanger 5 makes a forced heat exchange with the air, after passing through the duct 6, the four-way reversing valve 13 and the gas-liquid separator 8, enters into the air suction inlet of compressor 7, compressed in the compressor and turns into high temperature and high pressure gas. Accordingly, it forms a complete refrigeration cycle. The temperature sensing bulb 12 of thermal expansion valve 11 is applied for adjusting the valve opening degree by testing overheat degree of low temperature and low pressure gas.
Generally, the refrigerant state entering into the principal distributor 1 is two phases of gas and liquid. Because gas refrigerant and liquid refrigerant have different densities and distributions, it is difficult to make a uniform mixture in the principal distributor 1. Whether the refrigerant is uniformly distributed in the principal distributor 1 and then enters into each heat exchanger 5 is critical to determine and restrict the performance of heat exchanger 5 and the units.
In view of the above-mentioned problems, in order to improve the heat exchange efficiency of refrigeration system, it needs a refrigerant distribution device applying in refrigeration system for realizing uniform distribution and allocation of refrigerant.

SUMMARY OF THE INVENTION

A series of concepts with simplified form are referenced in the invention content, which will be further described in detail in the part of particular embodiments. The invention content of the present invention does not imply to attempt to limit the critical features and the essential technical features of the solution which it seeks to protect, furthermore, does not imply to attempt to ensure the protection scope of technical solution which it seeks to protect.
In order to solve the problems in the prior technology as above-mentioned, the invention provides a refrigerant distribution device for refrigeration system, capable of improving heat exchange efficiency, comprising: an entering duct, a bottom cover plate, a core, a hollow cylinder, an upper cover plate and multi-branch ducts, said core disposed in the space formed by the bottom cover plate, the cylinder and the upper cover plate, a plurality of openings distributed on the core.
According to another aspect of the invention, said upper cover plate has a centrosymmetric shape; an upper cover plate protuberance protuberating to said multi-branch ducts is disposed at its center.
According to another aspect of the invention, said upper cover plate has a circular or semi-ellipsoidal shape.
According to another aspect of the invention, said upper cover plate and said cylinder are integrated.
According to another aspect of the invention, the side that said entering duct connects said bottom cover plate has an invaginated port, whose cross section contour is any of hyperbola, parabola or straight line.
According to another aspect of the invention, the inner wall of said entering duct is provided with threads.
According to another aspect of the invention, said core is a circular flat plate with centrosymmetric shape, a spherical crown protuberating to the cylinder provided at its center, said openings uniformly distributed around the spherical crown, equal scale gaps uniformly distributed at circumferential equal-angle of said core.
According to another aspect of the invention, said openings being one or more of these kinds: circular openings, petal-shaped openings and/or square openings.
According to another aspect of the invention, said core is a hollow cone-shaped cylinder, said cylinder connected to said bottom cover plate by the supporting feet disposed at the bottom of the cone, a narrow space formed between said supporting feet.
According to another aspect of the invention, along the refrigerant's flowing direction, said core successively comprises a cylindrical first cylinder with a larger section diameter, a connector and a cylindrical second cylinder with a smaller section diameter, said openings uniformly distributed on said first cylinder, said connector and said second cylinder.
According to another aspect of the invention, said connector is annular flat plate or cone-shaped cylinder.
According to another aspect of the invention, said core comprises a cylindrical cylinder, an ellipsoidal shell and an annular flat plate, said openings uniformly distributed on said cylindrical cylinder, said shell embedded within said cylindrical cylinder, said annular flat plate provided in the middle of said cylindrical cylinder and surrounding said cylindrical cylinder, a plurality of gaps uniformly provided at the peripheral edge of said annular flat plate, supporting feet used to connect to said bottom cover plate provided at said shell.
According to another aspect of the invention, said core is a spherical surface shell, said openings uniformly distributed on said shell, supporting feet used to connect to said bottom cover plate provided at the bottom of said shell.
According to another aspect of the invention, a plurality of guiding blades are uniformly distributed at the inner side of said shell.

BRIEF DESCRIPTION OF THE DRAWINGS

The following figures of the present invention are used to illustrate the invention herein as one part of the present invention. The embodiments and description thereof of the present invention are shown in the figures in order to explain the principle of the invention, wherein:

FIG. 1 is a schematic diagram of conventional refrigeration system in the prior technology;

FIG. 2 is a structural schematic diagram of the first embodiment in accordance with the refrigerant distribution device of the invention;

FIG. 3 is a structural schematic diagram of the first embodiment of the upper cover plate of the refrigerant distribution device in FIG. 2;

FIG. 4 a is a structural schematic diagram of the second embodiment of the upper cover plate of the refrigerant distribution device in FIG. 2;

FIG. 4 b is a sectional view along the central line of FIG. 4 a;

FIG. 5 is a structural schematic diagram of the first embodiment of the entering duct of the refrigerant distribution device in FIG. 2;

FIG. 6 is a structural schematic diagram of the second embodiment of the entering duct of the refrigerant distribution device in FIG. 2;

FIG. 7 is a structural schematic diagram of the third embodiment of the entering duct of the refrigerant distribution device in FIG. 2;

FIG. 8 is a structural schematic diagram of the fourth embodiment of the entering duct of the refrigerant distribution device in FIG. 2;

FIG. 9 is a structural schematic diagram of the first embodiment of the core of the refrigerant distribution device in FIG. 2;

FIG. 10 is a structural schematic diagram of the second embodiment of the core of the refrigerant distribution device in FIG. 2;

FIG. 11 is a structural schematic diagram of the third embodiment of the core of the refrigerant distribution device in FIG. 2;

FIG. 12 is a structural schematic diagram of the second embodiment of the refrigerant distribution device in accordance with the present invention;

FIG. 13 is a structural schematic diagram of the first embodiment of the core of the refrigerant distribution device in FIG. 12;

FIG. 14 is a structural schematic diagram of the second embodiment of the core of the refrigerant distribution device in FIG. 12;

FIG. 15 is a structural schematic diagram of the third embodiment of the core of the refrigerant distribution device in FIG. 12;

FIG. 16 is a structural schematic diagram of the third embodiment of the refrigerant distribution device in accordance with the present invention;

FIG. 17 is a structural schematic diagram of the core of the refrigerant distribution device in FIG. 16;

FIG. 18 is a structural schematic diagram of the fourth embodiment of the refrigerant distribution device in accordance with the present invention;

FIG. 19 is a structural schematic diagram of the first embodiment of the core of the refrigerant distribution device in FIG. 18;

FIG. 20 is a structural schematic diagram of the second embodiment of the core of the refrigerant distribution device in FIG. 18.

DETAILED DESCRIPTION OF THE INVENTION

In the following description, a number of particular details are disclosed for a clearer understanding of the present invention. However, it is obvious for those skilled in the art that the invention can be implemented without one or more such details. In other examples, some common technical features in the art are not described in order to avoid confusion with the present invention.
A detailed explanation of the present invention will be presented with reference to the accompanying figures.
FIG. 2 is a structural schematic diagram of the first embodiment of the refrigerant distribution device in principal distributor for refrigeration system in accordance with the present invention. As shown in FIG. 2, the refrigerant distribution device 1, along the refrigerant's flowing direction, successively comprises: a refrigerant entering duct 1_1, a bottom cover plate 1_2, a core 1_3, a cylinder 1_4, an upper cover plate 1_5 and multi-branch ducts 1_6. The refrigerant as shown in FIG. 1 is throttled by the thermal expansion valve 11, forms two phases state of gas and liquid, and enters into the distribution device 1 via the entering duct 1_1 of the refrigerant distribution device 1. After impacting with the core 1_3 of the refrigerant distribution device 1 and being throttled, the refrigerant of two phases of gas-liquid is mixed fully and uniformly in the distribution device 1, then flows out from the distribution device 1 by the upper cover plate 1_5 and the multi-branch ducts 1_6, and into the heat exchanger 5 as shown in FIG. 1. In this embodiment, the entering duct 1_1 is of hollow cylinder structure; the bottom cover plate 1_2 has an opening with consistent duct diameter with said entering duct 1_1 and connects to the entering duct 1_1; the core 1_3 is disposed into the cylinder 1_4, on which distributed the first openings with different kinds and apertures.
FIG. 3 is a structural schematic diagram of the first embodiment of the upper cover plate of the refrigerant distribution device in FIG. 2. As shown in the figure, the upper cover plate 1_51 has a centrosymmetric shape, such as circular shape, on which disposed at least two second openings 1_511 corresponding to the multi-branch ducts 1_6, wherein the diameters of the openings are determined in accordance with the diameter of their connecting ducts 1_6.
A plurality of second openings 1_511 on said upper cover plate 1_51 are disposed in accordance with the number of duct orifices of said multi-branch ducts 1_6, and connect with the multi-branch ducts 1_6.
FIG. 4 a and FIG. 4 b are structural schematic diagrams of the second embodiment of the upper cover plate of the refrigerant distribution device shown in FIG. 2, wherein FIG. 4 b is a sectional view along the central line of FIG. 4 a. As shown in FIGS. 4 a and 4 b, the upper cover plate 1_52 having a centrosymmetric shape is provided with an upper cover plate protuberance 1_522 on its central area, a plurality of (more than two) second openings 1_521 corresponding to the duct orifices of said multi-branch ducts 1_6 distributed around the protuberance 1_522, the second openings 1_521 connecting with the multi-branch ducts 1_6. The upper cover plate protuberance 1_522 protuberates to the multi-branch ducts 1_6, whose size and shape are disposed in line with the distribution state of the orifices of the multi-branch ducts 1_6. The upper cover plate protuberance 1_522 makes a certain improvement for impacting effect and throttling effect of two phases refrigerant fluid, and enhances the uniformity of the principal distributor's distribution.
FIG. 5, FIG. 6, FIG. 7 and FIG. 8 respectively shows various kinds of structural schematic diagrams of the entering duct 1_1 of the refrigerant distribution device in FIG. 2. The structure of entering duct 1_11 shown in FIG. 5 is a spiral duct, whose function is producing a certain agitation when the refrigerant enters into the distributing device 1, in order to make a certain pre-mixture of refrigerant gas and liquid. As shown in FIG. 6, the side of the entering duct 1_12 connecting to the bottom cover plate 1_2 has an invaginated port, whose cross section contour is hyperbola form in order that the flowing sectional area can gradually reduces when refrigerant gas and liquid flows to the bottom cover plate 1_2, which enhances the speed of the refrigerant entering into the distribution device 1, brings better impacting effect and throttling effect of fluid, and further improves the uniformity of principal distributor distribution. At the side connecting to the bottom cover plate 1_2, the entering duct 1_13 shown in FIG. 7 has an invaginated port whose sectional contour line is parabola form, which can likewise gradually reduce the flowing sectional area when the refrigerant gas and liquid flows towards the bottom cover plate 1_2, and enhance the speed of the refrigerant entering into the distribution device 1. The entering duct 1_14 shown in FIG. 8 has an invaginated port that the sectional contour line is linear form at the side connecting to the bottom cover plate 1_2, which also gradually reduces the flowing sectional area when the refrigerant gas and liquid flows towards the bottom cover plate 1_2. Certainly, the sectional area contour line of invaginated port of the entering ducts in FIGS. 6-8 is not limited in hyperbola, parabola or straight line, other line types are also acceptable, providing that they are capable of improving the speed that the refrigerant entering the distribution device.
FIG. 9 is a structural schematic diagram of the first embodiment of the core of the refrigerant distribution device in FIG. 2. As shown in FIG. 9, the core 1_31 is a circular flat plate, whose central part has an ellipsoidal crown 1_313, the crown protuberating to the cylinder 1_4. A plurality of circular first openings 1_312 are uniformly distributed at equal angles of circumference of the circular flat plate. The aperture of the openings is 1˜3 mm. The first gaps 1_311 with equal scales are uniformly distributed at equal angles along the circumference. When the refrigerant entering through the entering duct 1_1 of distribution device 1 impacts the crown 1_313, the liquid droplets included in the refrigerant break into small droplets; the gas and liquid simultaneously change the direction; by throttling of the uniformly distributed first openings 1_312 on flat plate, the gas-liquid mixture becomes the refrigerant mixture with more uniform thinning droplets; a part of the refrigerant enters into the upper space of distribution device 1 after passing through the first gaps 1_311. Two parts of refrigerant at the upper part of core 1_31 of distribution device 1 are uniformly distributed in each heat exchanger 5 by multi-branch ducts 1_6. The application of first gaps 1_311 is capable of effectively reducing the pressure loss that the refrigerant flows through the principal distribution device 1.
FIG. 10 is a structural schematic diagram of the second embodiment of the core of the refrigerant distribution device in FIG. 2. As shown in FIG. 10, core 1_32 is a circular flat plate; an ellipsoid protuberance 1_323 is provided on the central part; a plurality of circular first openings 1_322 are uniformly distributed along the circumference of the protuberance 1_323 at equal angles; also uniformly disposed are petal-shaped first openings 1_321 along the circumferential equal angles. When the refrigerant entering through the entering 1_1 duct of distribution device 1 impacts the spherical crown 1_323, the gas and liquid simultaneously change the direction; by throttling of the uniformly distributed first openings 1_322 on the flat plate, the gas-liquid mixture becomes the refrigerant mixture with more uniform thinning droplets; a part of gas-liquid mixture enters into the upper part space of distribution device 1 by throttling of petal-shaped first openings 1_321. The refrigerant of two parts at the upper part of core 1_32 of distribution device 1 is uniformly distributed in each heat exchanger 5 by the multi-branch ducts 1_6.
FIG. 11 is a structural schematic diagram of the third embodiment of the core of the refrigerant distribution device in FIG. 2. As shown in FIG. 11, the core 1_33 is a circular flat plate; a protuberated ellipsoidal crown 1_333 is provided at the central part; a plurality of circular first openings 1_332 are uniformly distributed along the circumferential equal angles of the spherical crown 1_333; also uniformly distributed are square first openings 1_331 along the equal angles of the circumference of the circular flat plate with the radial direction. When the refrigerant entering through the entering duct 1_1 of distribution device 1 impacts the spherical crown 1_333, the liquid droplets included in the refrigerant break into small droplets; the gas and liquid simultaneously change the direction; by the throttling of the uniformly distributed circular first openings 1_332, the gas-liquid mixture becomes the refrigerant mixture with more uniform thinning droplets; a part of gas-liquid mixture enters into the upper part space of distribution device 1 by the throttling of square first openings 1_331. The refrigerant of two parts at the upper part of core 1_33 of distribution device 1 is uniformly distributed in each heat exchanger 5 by the multi-branch ducts 1_6. It can be seen from the figures that the opening size of the first openings become gradually larger along the outward radial direction of the core 1_33, which is favorable to the distribution effect.
FIG. 12 is a structural schematic diagram of the second embodiment of the refrigerant distribution device in accordance with the present invention. As shown in FIG. 12, in this embodiment, along the refrigerant flowing direction, the refrigerant distribution device 2 successively comprises: a refrigerant entering duct 2_1, a bottom cover plate 2_2, a core 2_3, a cylinder 2_4 and multi-branch ducts 2_5. The refrigerant gets throttled via the thermal expansion valve 11, forms two phases state of gas-liquid, enters into the distribution device 2 via the entering duct 2_1 of refrigerant distribution device 2. The refrigerant of two phases of gas and liquid is uniformly mixed within the distribution device 2 after impacting with the bottom cover plate 2_2 and throttled via the core 2_3, then flows into the heat exchanger 5 via the multi-branch ducts 2_5. In this embodiment, said cylinder 2_4 also serves as upper cover plate. Said cylinder 2_4 is open at one side, connecting said bottom cover plate 2_2; the other side of said cylinder is a closed outward protuberated spherical surface, a plurality of second openings provided on the outward protuberated spherical surface, corresponding to the orifices of the multi-branch ducts 2_5. The particular structure of the core 2_3 will be described in detail as follows.
FIG. 13 is a structural schematic diagram of the first embodiment of the core of the refrigerant distribution device in FIG. 12. As shown in FIG. 13, in this embodiment, the core 2_31 is a cylinder 2_313 with hollow cone shape, wherein the refrigerant flows from the cone bottom with larger cross section to the cone top with smaller cross section. A plurality of first openings 2_314 are uniformly distributed at equal angles on the wall of the cylinder 2_313; the lower part of cylinder 2_313 is connected with the supporting feet 2_312, which are used for connecting the core 2_31 and the bottom cover plate 2_2 of distribution device 1. The conical top of the conical thin wall cylinder 2_313 is an opening. After the refrigerant entering through the entering duct 2_1 of distribution device 1 impacts the bottom cover plate 2_2, the liquid droplets included in the refrigerant break into small droplets, the gas and liquid simultaneously change the direction, partial refrigerant is throttled by the first openings 2_314 and enters into the multi-branch ducts 2_5, and partial refrigerant enters into the multi-branch ducts 2_5 by the narrow space A (as shown in partial view A) formed between the cylinder 2_313 and the supporting feet 2_312, and is uniformly distributed in each heat exchanger 5. On the one hand, the conical core 2_31 gradually reduces the fluid flowing section area to compress the refrigerant and further mixes the two phases of gas and liquid; on the other hand, it improves the flowing speed and increases the impacting effect, diminishes the diameter of the small liquid droplets that are the liquid droplets included in the refrigerant formed by the impact, and enhances the effect of uniform mixture of gas and liquid. The pressure loss and the distribution performance after the refrigerant passing through the refrigerant distribution device 2 can be effectively controlled by adjusting the height and the width of the supporting feet 2_312. The supporting feet 2_312 can utilize the connecting manner (for example, welding) known for those skilled in the art to fix the conical thin wall cylinder 2_313 at the bottom cover plate 2_2.
FIG. 14 is a structural schematic diagram of the second embodiment of the core of the refrigerant distribution device in FIG. 12. As shown in FIG. 14, in this embodiment, said core 2_32, along the refrigerant flowing direction, successively comprises: a cylindrical first cylinder 2_321 with a larger section diameter, an annular flat plate 2_323 and a cylindrical second cylinder 2_324 with a smaller section diameter. The first cylinder 2_321 is connected with the second cylinder 2_324 via the annular flat plate 2_323. A plurality of circular first openings 2_322 are uniformly distributed on the first cylinder 2_321, second cylinder 2_324 and the flat plate 2_323. The liquid droplets included in the refrigerant break into small droplets after the refrigerant entering through the entering duct 2_1 of the refrigerant distribution device 2 impacts the bottom cover plate 2_2; the gas and liquid simultaneously change the direction and throttled by the first openings 2_322 on the first cylinder 2_321, second cylinder 2_324 and flat plate 2_323, form more uniform mixture, enter into the multi-branch ducts 2_5, and are uniformly distributed in each heat exchanger 5. The section diameter of the second cylinder 2_324 is smaller than that of the first cylinder 2_321. On the one hand, the arrangement compresses the refrigerant due to the reduction of flowing area and further mixes the two phases of gas and liquid; On the other hand, the arrangement improves the flowing speed, increases the impacting effect, diminishes the diameter of the small liquid droplets in the refrigerant formed by the impact, and enhances the effect of uniform mixture of gas and liquid. Furthermore, it can effectively solve the problem that the cylinder diameter of refrigerant distribution device 2 has to be expanded due to the increase of the number of multi-branch ducts in the prior technology.
FIG. 15 is a structural schematic diagram of the third embodiment of the core of the refrigerant distribution device in FIG. 12. As shown in FIG. 15, in this embodiment, the core 2_33, along the refrigerant flowing direction, successively comprises: a cylindrical first cylinder 2_331 with a larger section diameter, a conical cylinder 2_333 and a cylindrical second cylinder 2_334 with a smaller section diameter. The first cylinder 2_331 is connected with the second cylinder 2_334 via the conical cylinder 2_333. As shown in FIG. 15, the bottom of the conical cylinder 2_333 communicates with the first cylinder 2_332; the top of the conical cylinder 2_333 communicates with the second cylinder 2_334. The first openings 2_332 are uniformly distributed on the first cylinder 2_331, the conical cylinder 2_333 and the second cylinder 2_334. After the refrigerant entering through the entering duct 2_1 of refrigerant distribution device 2 and impacting the bottom cover plate 2_2, the liquid droplets included in the refrigerant break into small droplets; the gas and liquid simultaneously change the direction and are throttled by the first openings 2_332 on the first cylinder 2_331, conical cylinder 2_333 and second cylinder 2_334, form more uniform mixture and enter into the multi-branch ducts 2_5, and uniformly distributed in each heat exchanger 5. The section diameter of the second cylinder 2_334 is smaller than that of the first cylinder 2_331. On the one hand, the arrangement compresses the refrigerant due to the reduction of flowing area and further mixes two phases of gas and liquid; On the other hand, the arrangement improves the flowing speed and increases the impacting effect, diminishes the droplet diameter of the small liquid droplets in the refrigerant formed by the impact, enhances the effect of uniform mixture of gas and liquid. Furthermore, it also can effectively solve the problem that the cylinder diameter of the refrigerant distribution device 2 needs to be gradually expanded due to the increase of the number of the multi-branch ducts. The utility of the second cylindrical cylinder 2_334 can gradually reduce the fluid section, gradually increase the refrigerant flowing speed and improve the effect to form small droplets after the liquid droplets impacting the upper cover plate.
FIG. 16 is a structural schematic diagram of the third embodiment of the refrigerant distribution device in accordance with the present invention. As shown in FIG. 16, in this embodiment, the refrigerant distribution device 3, along the refrigerant flowing direction, successively comprises: a refrigerant entering duct 3_1, a bottom cover plate 3_2, a core 3_3, a cylinder 3_4, an upper cover plate 3_5 and multi-branch ducts 3_6. The refrigerant is throttled via the thermal expansion valve 11, forms two phases state of gas and liquid, enters the distribution device 3 via the entering duct 3_1 of the distribution device 3; the refrigerant of the two phases of gas and liquid is uniformly mixed in the refrigerant distribution device 3 after the refrigerant impacting with the bottom cover plate 3_2 and the core 3_3 of the distribution device 3 and being throttled, and flows into the heat exchanger 5 via the multi-branch ducts 3_6. The difference between this embodiment and other embodiments lies in their different structures of core 3_3, more particularly, as shown in FIG. 17.
FIG. 17 is a structural schematic diagram of the core of the refrigerant distribution device in FIG. 16. As shown in FIG. 17, in this embodiment, the core 3_4 comprises the cylindrical cylinder 3_41 on which the first openings 3_45 are uniformly distributed, the first shell 3_42 with ellipsoidal thin wall and the annular flat plate 3_44 with the uniformly distributed gaps 3_46. The first shell 3_42 is embedded in the end connecting the bottom cover plate 3_2 in the cylinder 3_41, has the first supporting feet 3_43 utilized for fixing, locating and connecting the first shell 3_42 with the bottom cover plate 3_2. The annular flat plate 3_44 is provided in the middle of the cylindrical cylinder 3_41 and around the cylindrical cylinder 3_41; a plurality of gaps 3_46 are uniformly provided at the spherical edge of the annular flat plate. After the refrigerant entering through the entering duct 3_1 of distribution device 3 and impacting the first shell 3_42 with ellipsoidal thin wall, the big droplets liquid included in the refrigerant are broken into small droplets; the gas and liquid simultaneously change the direction; partial gas directly enters into the top space of the cylindrical cylinder 3_41 through the narrow space formed by the first shell 3_42 with ellipsoidal thin wall and the cylindrical cylinder 3_41, enters into the upper cover plate 3_5 of distribution device 3 after being throttled by the first openings 3_45, and distributed in heat exchanger 5. Partial gas is distributed in heat exchanger 5 after being throttled by the first openings 3_45 of the bottom of the cylindrical cylinder 3_41 and entering into the multi-branch ducts 3_6 via the gaps 3_46 of the annular flat plate 3_44. The utility of the first supporting feet 3_43 of the first shell 3_42 with ellipsoidal thin wall, on the one hand, functions as the fixation, location and connection between the first shell 3_42 and the bottom cover plate 3_2; on the other hand, the resulting space formed by the first shell 3_42 and the bottom cover plate 3_2 provides a space for the refrigerant circulation. The pressure loss and the distribution performance after the refrigerant passing through the refrigerant distribution device 3 can be effectively controlled by adjusting the height and the width of the first supporting feet 3_43. The first supporting feet 3_43 can utilize the connecting manner (for example, welding) known for those skilled in the art to connect the first shell 3_42 with the bottom cover plate 3_2.
FIG. 18 is a structural schematic diagram of the fourth embodiment of the refrigerant distribution device in accordance with the present invention. As shown in FIG. 18, in this embodiment, the refrigerant distribution device 4, along the refrigerant flowing direction, successively comprises: a refrigerant entering duct 4_1, a bottom cover plate 4_2, a core 4_3, a cylinder 4_4, an upper cover plate 4_5 and multi-branch ducts 4_6. The refrigerant is throttled via the thermal expansion valve 11, forms two phases state of gas and liquid, enters the distribution device 4 via the entering duct 4_1 of the refrigeration distribution device 4; the refrigerant of the two phases of gas and liquid is uniformly mixed in the distribution device 4 after impacting with the core 4_3 of the distribution device 4 and being throttled, and flows into the heat exchanger 5 via the multi-branch ducts 4_6. The structural selection of core 4_3 is shown in FIG. 19 and FIG. 20, as described in detail as follows.
FIG. 19 is a structural schematic diagram of the first embodiment of core of the refrigerant distribution device in FIG. 18. As shown in FIG. 19, the core 4_31 is the semi-ellipsoidal second shell 4_316 with one end open; the circular first openings 4_311 and the square third openings 4_312 are uniformly distributed on the second shell 4_316; a plurality of guiding blades 4_313 are uniformly distributed at the inner side of the second shell 4_316. The second shell 4_316 is connected with the bottom cover plate 4_2 by a plurality of second supporting feet 4_314 disposed at the opening end of the shell. The big droplet liquid included in the refrigerant is broken into small droplets after the refrigerant entering through the entering duct 4_1 of distribution device 4 impacts the top of the second shell 4_316; the gas and liquid simultaneously change the direction; partial refrigerant enters into the multi-branch ducts 4_6 of refrigerant distribution device 4 by the third openings 4_312 and the first openings 4_311 on the second shell 4_316, and is distributed in heat exchanger 5. Partial refrigerant is distributed in heat exchanger 5 after entering into the multi-branch ducts 4_6 of refrigerant distribution device 4 by the gap formed between the bottom cover plate 4_2, the second supporting feet 4_314 and the second shell 4_316. The pressure loss and the distribution performance after the refrigerant passing through the refrigerant distribution device 4 can be effectively controlled by adjusting the height and the width of the second supporting feet 4_314. The utility of guiding blades 4_313 can make the refrigerant be distributed more uniformly in the multi-branch ducts 4-6, to improve the uniformity that the refrigerant is distributed to heat exchanger 5. Certainly, the second shell 4_316 is not limited to semi-ellipsoid, other spherical surfaces are also feasible.
FIG. 20 is a structural schematic diagram of the second embodiment of the core of the refrigerant distribution device in FIG. 18. As shown in FIG. 20, in the embodiment, the core 4_32 comprises the cylindrical third shell 4_321 and the semi-ellipsoidal fourth shell 4_322. The first openings 4_327 are distributed on the third shell 4_321 in a uniform and staggered manner; a plurality of gaps 4_323, along the circumference direction, are uniformly provided at the open end. The circular fourth openings 4_235 and the ellipsoidal fifth openings 4_326 are uniformly distributed on the fourth shell 4_322. A plurality of guiding blades 4_324 are uniformly distributed at the inner side of the fourth shell 4_322. The big droplet liquid included in the refrigerant is broken into small droplets after the refrigerant entering by the entering duct 4_1 of distribution device 4 impacts the top of the semi-ellipsoidal fourth shell 4_322; the gas and liquid simultaneously change the direction; partial refrigerant enters into the multi-branch ducts 4_6 of refrigerant distribution device 4 by the fourth openings 4_235 and the fifth openings 4_326 on the semi-ellipsoidal fourth shell 4_322, and is distributed in heat exchanger 5. Partial refrigerant enters into the multi-branch ducts 4_6 of distribution device 4 by the first openings 4_327 and the gaps 4_323 on the cylindrical shell 4_321, and is distributed in heat exchanger 5. The pressure loss and the distribution performance after the refrigerant passing through the refrigerant distribution device 4 can be effectively controlled by adjusting the height and the width of the gaps 4_323. The utility of guiding blades 4_324 can make the refrigerant to more uniformly be distributed in the multi-branch ducts 4_6 to improve the uniformity that the refrigerant is distributed in heat exchanger 5.
In these embodiments above, for said first openings to said third openings, the present invention does not limit their size of the apertures, numbers and shapes. In actual operation, those skilled in the art can make a setting in accordance with the shape of the core; furthermore, said central line of the entering duct along the axis direction, the symmetric center of said bottom cover plate, the symmetric center of said core, said central line of the cylinder along the axis direction and the symmetric center of said upper cover plate are in one line.
It is noted that such relative terms as “first”, “second”, “third” as mentioned in this text are only used to differentiate one entity from another, not necessarily require or imply that any such actual relation or order exists among these entities. In addition, “include”, “comprise” or any other variants as mentioned in this text imply to contain non excludability inclusion.
The invention has been described by the embodiments as mentioned above, but it should be understood that said embodiments are only used for exemplification and description, not implied to limit the present invention in the scope of said embodiments; moreover, it can be understood by those skilled in the art that the invention is not limited to said embodiments, more variants and modifications can be made according to the invention, which fall in the scope that the invention seeks to protect. The protection scope of the invention is limited by attached claims and their equivalent scope.

Claims

1. A refrigerant distribution device for a refrigeration system, characterized in that said refrigerant distribution device comprising: an entering duct a bottom cover plate, a core, a hollow cylinder, an upper cover plate and multi-branch ducts, said core disposed in the space formed by said bottom cover plate, said cylinder and said upper cover plate,

wherein a plurality of openings are distributed on said core.

2. The refrigerant distribution device of claim 1, characterized in that said upper cover plate having a centrosymmetric shape, and on the center of the upper cover plate disposed an upper cover plate protuberance protuberating toward said multi-branch ducts.

3. The refrigerant distribution device of claim 2, characterized in that said upper cover plate having a circular or semi-ellipsoidal shape.

4. The refrigerant distribution device of claim 1, characterized in that said upper cover plate and said cylinder are integrated.

5. The refrigerant distribution device of claim 1, characterized in that the side that said entering duct connects said bottom cover plate having an invaginated port, whose cross section contour being any of hyperbola, parabola or straight line.

6. The refrigerant distribution device of claim 1, characterized in that the inner wall of said entering duct provided with threads.

7. The refrigerant distribution device of claim 1, characterized in that said core being a circular flat plate with centrosymmetric shape, a spherical crown protuberating to the cylinder provided at its center, said openings uniformly distributed around the spherical crown, equal scale gaps uniformly distributed at circumferential equal-angle of said core.

8. The refrigerant distribution device of claim 1, characterized in that said openings being one or more of these kinds: circular openings, petal-shaped openings and/or square openings.

9. The refrigerant distribution device of claim 1, characterized in that said core being a hollow cone-shaped cylinder, said cylinder connected to said bottom cover plate by supporting feet that disposed at the bottom of the cone, a narrow space (A) formed between said supporting feet.

10. The refrigerant distribution device of claim 1, characterized in that along the refrigerant's flowing direction, said core successively comprising a cylindrical first cylinder with a larger section diameter, a connector and a cylindrical second cylinder with a smaller section diameter, said openings uniformly distributed on said first cylinder, said connector and said second cylinder.

11. The refrigerant distribution device of claim 10, characterized in that said connector being annular flat plate or cone-shaped cylinder.

12. The refrigerant distribution device of claim 1, characterized in that said core comprising a cylindrical cylinder, an ellipsoidal shell and an annular flat plate, said openings uniformly distributed on said cylindrical cylinder, said shell embedded within said cylindrical cylinder, said annular flat plate disposed in the middle of said cylindrical cylinder and surrounding said cylindrical cylinder, a plurality of gaps uniformly provided at the peripheral edge of said annular flat plate, supporting feet used to connect to said bottom cover plate provided at said shell.

13. The refrigerant distribution device of claim 1, characterized in that said core being a spherical surface shell, said openings uniformly distributed on said shell, supporting feet used to connect to said bottom cover plate provided at the bottom of said shell.

14. The refrigerant distribution device of claim 13, characterized in that a plurality of guiding blades uniformly distributed at the inner side of said shell.