CN1293350C - Multi-channel plug-in heat regenerator - Google Patents

Abstract

The multi-channel plug-in regenerator includes a heat exchanger core and a liquid collection tank integrated with the heat exchanger core. The heat exchanger core is composed of a middle channel and a peripheral channel with small apertures, and the middle channel Protruding from the peripheral channel, the two ends of the heat exchanger core are respectively fitted with a liquid collection tank with one-side openings communicating with the middle channel and a liquid collection tank with double-side openings communicating with the peripheral channel. In the present invention, the heat exchanger with multiple rows of small-aperture channel structures is used as the main body for heat exchange between two fluids. The multi-row small-aperture channel structure increases the heat exchange area and enhances heat exchange. At the same time, the peripheral channel surrounds the middle channel, making the middle channel The effective heat or cooling capacity of the fluid in the channel will not be lost, and the core of the heat exchanger is respectively connected to the liquid collection tank with double-side openings and the single-side opening liquid collection tank, which can effectively improve system efficiency and enhance heat exchange without causing to increase the size of the system too much.

Description

Multi-channel plug-in regenerator

technical field

The invention relates to a regenerator, in particular to a multi-channel plug-in regenerator used in carbon dioxide supercritical cycle equipment for refrigeration, air conditioning and heat pump cycles.

technical background

With the complete prohibition of CFCs, carbon dioxide, as a natural working fluid with great potential to replace CFCs and HCFCs, has attracted increasing attention from various countries, and is currently widely used in refrigeration, air conditioning and heat pump circulation systems. If the working fluid has a greater subcooling degree before entering the throttle valve, it will improve the operating efficiency of the system and improve system performance; if the working fluid has a certain superheating degree before entering the compressor, it can be well protected compressor, while the regenerator can realize the subcooling of the working fluid before entering the throttle valve and the superheating of the working fluid before entering the compressor at the same time. However, in the traditional refrigeration system, due to consideration of the relationship between the regenerator and the system cycle efficiency and structural size, the size of the evaporator is generally increased or the gas-liquid separator is used to realize the dry compression of the compressor to protect the safe operation of the compressor. In the system using carbon dioxide as the refrigerant, the refrigeration cycle is a transcritical cycle, and the refrigerant is cooled in a gas cooler, and it is different from the traditional gas-liquid two-phase cooling, it is a supercritical single-phase cooling, and it is impossible to enter the gas In the liquid two-phase region, parallel flow heat exchangers with more compact structure and higher heat transfer efficiency are generally used, and the outlet temperature of the working fluid is relatively close to the ambient temperature. If the traditional supercooling method is adopted: instead of using the regenerator, the size of the gas cooler is increased to overcool the working medium, which not only increases the quality and cost, but also the outlet temperature of the working medium cannot be lower than the ambient temperature, which cannot reach the predetermined Effect. The operating pressure of carbon dioxide itself is very high, and the flow resistance has little effect on the cycle performance, so it is suitable for channel type regenerators with small apertures. In terms of structure, the traditional regenerator adopts casing or shell-and-tube type, which has complex structure, large size, not compact enough, complicated production and processing technology, and is difficult to realize. It is only suitable for use in traditional refrigerant refrigeration systems.

Contents of the invention

The purpose of the present invention is to overcome the above-mentioned shortcomings of the prior art, and provide a multi-channel plug-in regenerator capable of enhancing heat transfer, reducing cooling loss, increasing circulation system efficiency, reducing structural size, and reducing product cost.

In order to achieve the above object, the solution adopted by the present invention is to include a heat exchanger core body and a liquid collection tank connected with the heat exchanger core body. The middle channel and the peripheral channel are composed of the middle channel and the peripheral channel, and the middle channel protrudes from the peripheral channel. The two ends of the heat exchanger core are respectively equipped with a liquid collection tank connected with the middle channel and a liquid collection tank connected with the peripheral channel from the outside to the inside. , where the liquid collection tank connected to the middle channel communicates with the middle channel through a single-side opening on the liquid collection tank, and the cross-sectional size of the single-side opening is the same as that of the middle channel, while the liquid collection tank connected to the peripheral channel passes through The openings on both sides of the liquid collection tank are connected to the peripheral channel, and one hole of the liquid collection tank connected to the peripheral channel is the same as the cross-sectional size of the heat exchanger core, and the other hole is the same as the protruding hole of the heat exchanger core. The cross-sections of the intermediate passages have the same size.

In the present invention, the liquid collection tank connected with the peripheral channel is a round tube with an inner diameter greater than the thickness of the heat exchanger core; the liquid collection tank connected with the middle channel is a round tube with an inner diameter greater than the thickness of the middle channel of the heat exchanger core; The core of the heat exchanger is composed of upper and lower rows of channels with small apertures, and the apertures of each row of channels can be the same or different; the core of the heat exchanger is a straight or bent structure.

In the present invention, the heat exchanger with multiple rows of small-aperture channel structures is used as the main body of heat exchange between two fluids. The multi-row small-aperture channel structure increases the heat exchange area and enhances heat exchange. At the same time, the peripheral channel surrounds the middle channel, making the middle channel The effective heat or cold capacity of the fluid in the channel will not be lost, and the heat exchanger core communicates with the liquid collection tank with double-side openings and the single-side opening liquid collection tank to solve the isolation of the two fluids, which can effectively improve the system efficiency and enhanced heat transfer without increasing the size of the system too much.

Description of drawings

Fig. 1 is the overall structural representation of the present invention;

Fig. 2 is a schematic structural view of the regenerator core 3 of the present invention;

Fig. 3 is the structure schematic diagram of the liquid collecting tank 1 that communicates with the middle channel 6 of the present invention;

Fig. 4 is the structural representation of the liquid collection tank 2 that communicates with the peripheral channel 7 of the present invention;

Fig. 5 is a schematic structural view of the bent type regenerator of the present invention.

Detailed ways

The structural principle and working principle of the present invention will be further described in detail below in conjunction with the accompanying drawings.

1 and 2, the present invention includes a heat exchanger core 3 provided with a small-diameter intermediate channel 6 and a peripheral channel 7, and the intermediate channel 6 protrudes from the peripheral channel 7, and the peripheral channel 7 surrounds the intermediate channel 6, so that the intermediate channel The fluid in 6 does not exchange heat with the environment, ensuring no loss of effective heat or cooling capacity. At the same time, the fluid isolation structure can further ensure no loss of effective heat or cooling capacity. The middle channel 6 and peripheral channel 7 can be arranged in one or more rows The small-aperture channel 11 is equipped with the liquid collection tanks 1 and 5 communicating with the middle channel 6 and the liquid collecting tanks 2 and 4 communicating with the peripheral channel 7 from the outside to the inside at both ends of the heat exchanger core 3, wherein The liquid collection tanks 1 and 5 communicated with the middle passage 6 are communicated with the middle passage 6 through the one-side opening 10 on the liquid collection tank, while the liquid collection tanks 2 and 4 communicated with the peripheral passage 7 are connected through the openings on the liquid collection tank. The openings 8 and 9 on both sides communicate with the peripheral channel 7. In order to ensure that the liquid collection tanks are closed during brazing, and to prevent the fluid between the liquid collection tanks from penetrating from the middle passage and the liquid collection tank to the surroundings, the present invention There is a small gap between the single-side perforated liquid collection tank 1 and the double-sided perforated liquid collection tank 2.

Referring to Fig. 4, the liquid collection tanks 2 and 4 communicated with the peripheral channel 7 are circular tubes with an inner diameter larger than the thickness of the heat exchanger core 3, and a tube with the same size as the cross section of the heat exchanger core 3 is set on one radial side. On the other side in the same direction, a hole 9 with the same size as the section of the middle channel 6 protruding from the heat exchanger core 3 is opened.

Referring to Fig. 3, the liquid collection tanks 1 and 5 connected with the middle channel 6 are circular tubes with an inner diameter larger than the thickness of the middle channel 6 of the heat exchanger core 3, and only one radial side is provided to connect with the heat exchanger core. The middle passage 6 of 3 has holes 10 of the same size in section.

Referring to Fig. 5, the heat exchanger core 3 of the present invention may be a bent structure.

In the working of the present invention, the working medium with low temperature enters the middle passage 6 from the liquid collection tank 1 connected with the middle passage 6, and the high temperature working medium enters the peripheral passage 7 from the liquid collection tank 4 connected with the peripheral passage 7, Then the two working fluids exchange heat in the heat exchanger core 3, the heated working fluid with a low temperature is discharged from the liquid collection tank 5 connected to the middle channel 6 on the other side, and the cooled working fluid with a high temperature is discharged from the The collecting tank 2, which communicates with the peripheral channel 7, is drained. In addition, the low-temperature working fluid enters from the liquid collection tank 1 connected with the intermediate channel 6 and is discharged from the liquid collection tank 5, or enters from the liquid collection tank 5 connected with the intermediate channel 6 and discharges from the liquid collection tank 1.

Claims (5)

1. A multi-channel plug-in regenerator, including a heat exchanger core (3) and a liquid collection tank integrated with the heat exchanger core (3), characterized in that: the heat exchanger core ( 3) It is composed of a middle channel (6) and a peripheral channel (7) with small apertures, and the middle channel (6) protrudes from the peripheral channel (7), and the two ends of the heat exchanger core (3) are respectively from the outside to the inside. The set is equipped with liquid collection tanks (1, 5) communicated with the middle channel (6) and liquid collection tanks (2, 4) communicated with the peripheral channel (7), wherein the liquid collection tanks communicated with the intermediate channel (6) The tanks (1, 5) communicate with the middle passage (6) through the single-side opening (10) on the liquid collection tank, and the cross-sectional size of the single-side opening (10) is the same as that of the middle passage (6), and is different from the peripheral The liquid collection tanks (2, 4) connected to the channel (7) are connected to the peripheral channel (7) through the double-sided openings (8, 9) on the liquid collection tank, wherein the collection tanks (2, 4) connected to the peripheral channel (7) One hole (8) of the liquid tank (2, 4) has the same cross-sectional size as the heat exchanger core (3), and the other hole (9) has the same cross-section as the protruding middle channel (6) of the heat exchanger core (3). same size. 2. The multi-channel plug-in regenerator according to claim 1, characterized in that the liquid collection tanks (2, 4) connected to the peripheral channels (7) have an inner diameter larger than that of the heat exchanger core ( 3) The thickness of the round tube. 3. The multi-channel plug-in regenerator according to claim 1, characterized in that: the liquid collection tanks (1, 5) connected to the middle channel (6) have an inner diameter larger than that of the heat exchanger core ( 3) A round tube with the thickness of the middle channel. 4. The multi-channel plug-in regenerator according to claim 1, characterized in that: said heat exchanger core (3) is composed of upper and lower rows of small-aperture channels (11), and the aperture of each row of channels can be The same may also be different. 5. The multi-channel plug-in regenerator according to claim 1, characterized in that: said heat exchanger core (3) is a straight or bent structure.

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