CN102116544A

CN102116544A - Air-conditioning heat exchanger

Info

Publication number: CN102116544A
Application number: CN 201010287207
Authority: CN
Inventors: 陈越增; 王立明; 邓军琦; 汪志强
Original assignee: NINGBO HICON INDUSTRY Co Ltd
Current assignee: NINGBO HICON INDUSTRY Co Ltd
Priority date: 2010-09-17
Filing date: 2010-09-17
Publication date: 2011-07-06

Abstract

The invention discloses an air-conditioning heat exchanger which comprises an outer pipe and an inner pipe, wherein the outer pipe is a straight pipe, the inner pipe is a spiral pipe, and the outer pipe and the inner pipe are mutually sleeved. The inner wall of the outer pipe and the outer spiral wall of the inner pipe are enveloped to form a spiral pipeline, a refrigerant enters through an inlet of the spiral pipeline and flows across the spiral pipeline, a refrigerating intermediate medium relatively flows in the inner pipe, the refrigerant exchanges heat with the intermediate medium through the wall of the inner spiral pipe, and the thread pitch of the inner spiral pipe is designed as gradual change according to the change situation of volume and pressure drop caused by the phase change of the refrigerant in the heat exchange process. Through the gradual change design for the thread pitch of the inner spiral pipe of the heat exchanger, a refrigerant channel can be adapted to the volume and pressure change of the refrigerant due to heat exchange, the stable pressure and the flow velocity of the refrigerant in the heat exchanger can be ensured, and the efficiency of the heat exchanger can be guaranteed; meanwhile, pressure loss in the heat exchange process is reduced, and the working load of a compressor is reduced; in addition, the total way resistance of the refrigerant is simultaneously reduced, and the delivery power of the refrigerant is reduced.

Description

Air-condition heat exchanger

Technical field

The present invention relates to a kind of heat exchanger, particularly a kind of heat exchanger that in air-conditioning, uses.

Background technology

The heat exchanger that uses in the at present existing air-conditioning is closed by outer tube and interior pipe box and forms, its middle external tube is a straight tube, interior pipe is the screwed pipe of uniform pitch, the spiral outer surface of the inwall of outer tube and interior pipe is sealed the formation helical pipe, cold-producing medium this helical pipe that enters and flow through from the porch of this helical pipe, the refrigeration intermediate medium flows in interior pipe, cold-producing medium is relative with the flow direction between the intermediate medium and carry out heat exchange by the spiral inner tubal wall, the shortcoming of this type of heat exchanger be cold-producing medium with the process of intermediate medium heat exchange in undergo phase transition promptly and become liquid state by initial gaseous state, the volume and the pressure of cold-producing medium alter a great deal, and the sectional area of the helical pipe that equidistant screwed pipe causes is constant, can't make corresponding adjustment to this, therefore cause the excessive and skewness of cold-producing medium partial drop of pressure in heat transfer process, the flow velocity instability of cold-producing medium, and then the efficient of heat exchange is reduced, and the pressure loss total in the whole heat exchanging process is excessive, strengthened the live load of compressor, heat exchanger pressure inequality causes cold-producing medium total on-way resistance in heat exchanger bigger in addition, has reduced the transfer efficiency of cold-producing medium.

Summary of the invention

The present invention is in order to overcome defective in the above-mentioned prior art; by the interior pipe of pitch gradual change is set; the variation that the volume that makes heat exchanger can adapt to phase transformation in the cold-producing medium heat exchanging process and take place, pressure fall and guarantee that the agent of heat exchanger internal refrigeration storage has pressure stable, flow velocity to improve heat exchange efficiency; reduce the pressure loss in the heat transfer process simultaneously, reduce the on-way resistance of heat exchanger in addition cold-producing medium.

Air-condition heat exchanger of the present invention, comprise outer tube and interior pipe, outer tube is a straight tube, interior pipe is helix tube, mutual fit between outer tube and the interior pipe, the spiral outer wall of the inwall of outer tube and interior pipe is sealed the formation helical pipe, cold-producing medium flows into and the described helical pipe of flowing through from described helical pipe porch, the refrigeration intermediate medium flows in interior pipe, carry out heat exchange by the spiral inner tubal wall between described cold-producing medium and the intermediate medium, the situation of change that volume that the pitch of pipe takes place according to cold-producing medium phase transformation in the heat exchanging process in the spiral and pressure fall forms the gradual change setting.

Preferably, cold-producing medium and intermediate medium relative motion in heat exchanger.

Wherein, in the spiral pitch of pipe in refrigerant inlet place maximum, in the corresponding position of intermediate medium import minimum, the pitch of pipe gradual change between minimum and maximum in the spiral.

Compared with prior art, air-condition heat exchanger of the present invention has following beneficial effect:

Pitch gradual change design by pipe in the heat exchanger, variation falls in the volume, the pressure that make coolant channel can adapt to cold-producing medium to take place because of heat exchange, guarantees pressure, the flow speed stability of heat exchanger inner refrigerant, has ensured efficiency of heat exchanger; Reduce the pressure loss of heat transfer process simultaneously, alleviate the live load of compressor; Reduce the total on-way resistance of cold-producing medium in addition simultaneously, reduce the transmitting power of cold-producing medium.

Description of drawings

Fig. 1 is the cutaway view of air-condition heat exchanger of the present invention;

Fig. 2 is the pitch gradient ramp figure of air-condition heat exchanger of the present invention;

Fig. 3 is that curve map falls in the pressure of air-condition heat exchanger of the present invention;

Fig. 4 is the resistance coefficient curve map of air-condition heat exchanger of the present invention.

Mark the following drawings mark thereon in conjunction with the accompanying drawings:

Pipe in the 1-heat exchanger, 2-heat exchanger outer tube.

The specific embodiment

Below in conjunction with accompanying drawing, a specific embodiment of the present invention is described in detail, but is to be understood that protection scope of the present invention is not subjected to the restriction of the specific embodiment.

As shown in Figure 1, air-condition heat exchanger of the present invention is made up of outer tube 2 and interior pipe 1, interior pipe 1 is a helix tube, mutual fit between outer tube 2 and the interior pipe 1, the spiral outer wall of the inwall of outer tube 2 and interior pipe 1 is sealed the formation helical pipe, cold-producing medium flows into and this helical pipe of flowing through from this helical pipe porch, and the refrigeration intermediate medium flows in interior pipe, and cold-producing medium is relative with the flow direction between the intermediate medium and carry out heat exchange by the spiral inner tubal wall.The situation of change that volume that the pitch of pipe takes place according to cold-producing medium phase transformation in the heat exchanging process in the spiral and pressure fall forms the gradual change setting, the pitch that is pipe in the spiral is in refrigerant inlet place maximum, form maximum coolant channel cross section, in the corresponding position of intermediate medium import pitch minimum, the gradual change between minimum and maximum of interior pipe pitch.

Further as shown in Figure 1, cold-producing medium is gaseous state when entering heat exchanger entrance, this moment coolant channel the sectional area maximum, cold-producing medium finally is condensed into liquid outflow heat exchanger after having experienced middle mixed state in the heat exchanging process, flow out the sectional area minimum of the coolant channel of position, this has adapted to that cold-producing medium becomes liquid state by gaseous state and the volume that takes place, the variation that pressure falls.

Further pitch change curve as shown in Figure 2 at the heat exchanger of R22 type cold-producing medium, pitch changes and is divided into 12 stages among the figure, and the pitch Changing Pattern is that the uniform pitch heat exchanger with correspondence is that (numerical value is benchmark: 1) by changing between the 3.2-0.4.

Further as shown in Figure 3,2nd section the pressure variation of R22 cold-producing medium after entering heat exchanger is in relatively stable; Stable the stable of cold-producing medium flow velocity that brought of pressure, heat exchange is also more steady; Falling summation 100% with the pressure of uniform pitch heat exchanger is benchmark, adopt the heat exchanger pressure of pitch gradual change fall the heat exchanger that always is about uniform pitch total pressure drop 46%, this can reduce the live load of compressor.

Again further as shown in Figure 4, the on-way resistance that R22 cold-producing medium total on-way resistance after entering heat exchanger is compared the uniform pitch heat exchanger approximately reduces by 54%, makes the power of compressor refrigerant conveying further reduce.

The pitch gradual change design of the interior pipe of air-condition heat exchanger of the present invention by heat exchanger tube makes coolant channel can adapt to the variation that volume that cold-producing medium takes place because of phase transformation and pressure falls and guarantees that the agent of heat exchange internal refrigeration storage has pressure stable, flow velocity to improve heat exchange efficiency; Reduce the pressure loss of heat transfer process simultaneously, alleviate the live load of compressor; Reduce the total on-way resistance of cold-producing medium in addition, reduce the transmitting power of cold-producing medium.

More than disclosed only be a specific embodiment of the present invention, still, the present invention is not limited thereto, any those skilled in the art can think variation all should fall into protection scope of the present invention.

Claims

1. air-condition heat exchanger, comprise outer tube and interior pipe, outer tube is a straight tube, interior pipe is helix tube, mutual fit between outer tube and the interior pipe, the spiral outer wall of the inwall of outer tube and interior pipe is sealed the formation helical pipe, cold-producing medium flows into and the described helical pipe of flowing through from described helical pipe porch, the refrigeration intermediate medium flows in interior pipe, carry out heat exchange by the spiral inner tubal wall between described cold-producing medium and the intermediate medium, it is characterized in that the pitch of pipe is fallen situation of change formation gradual change setting according to volume and the pressure that cold-producing medium phase transformation in the heat exchanging process takes place in the described spiral.

2. air-condition heat exchanger according to claim 1 is characterized in that, the relative motion in heat exchanger of described cold-producing medium and intermediate medium.

3. air-condition heat exchanger according to claim 2 is characterized in that, in the described spiral pitch of pipe in refrigerant inlet place maximum, in the corresponding position of intermediate medium import minimum, the pitch of pipe gradual change between minimum and maximum in the spiral.