CN107328144B - Evaporator and method for controlling dryness in pipe thereof - Google Patents

Abstract

The invention discloses an evaporator, which comprises a heat exchange tube, a first header and a second header, wherein the first header and the second header are respectively arranged on two sides of the heat exchange tube, an inlet guide tube and an outlet guide tube are arranged on the evaporator, clapboards are respectively arranged in the first header and the second header along the direction vertical to the axis of the heat exchange tube, the clapboards on any first header are mutually staggered with the clapboards on the second header, the clapboards divide the evaporator into a serpentine passage, a connecting pipeline is also arranged on the first header and/or the second header, the connecting pipeline comprises a first end and a second end, the first end is connected to the upstream of the serpentine passage, the second end is connected to the downstream of the serpentine passage, at least one clapboard is arranged between the first end and the second end at intervals, a pressure supply device is further arranged on the connecting pipeline, and dryness detection devices for detecting the dryness of a working medium are respectively arranged on the upstream of the serpentine passage and the downstream of the serpentine passage. The invention also discloses a method for controlling the dryness in the tube of the evaporator.

Description

Method for controlling dryness in tube of evaporator and evaporator

technical field

The invention relates to the technical field of air conditioning, in particular to an evaporator pipe dryness control method and the evaporator.

Background technique

With the development of social economy and the improvement of people's living standards, the air-conditioning industry has also developed rapidly, but the energy consumption of air-conditioning is also increasing year by year. For a complete refrigeration system, the evaporator is one of its important components, and the performance of the evaporator directly affects the performance of the entire refrigeration system. It is proved by experiments that under the premise that the mass flow rate of the working fluid in the cooling circuit in the evaporator is constant, the heat transfer coefficient of the working fluid changes with the change of its own dryness. The dryness of the working fluid is different, and the heat transfer coefficient is different. The unit The heat absorbed in the time is also different, so the heat exchange efficiency of the evaporator is different.

The current evaporator is generally composed of a heat exchange tube and a header. The working medium enters from the inlet duct, and after exchanging heat through the heat exchange tube installed in the evaporator, it flows out directly from the outlet duct, thereby realizing the heat exchange of the evaporator. However, during the flow of the working fluid, the dryness of the working fluid cannot be effectively controlled, resulting in low heat exchange efficiency of the evaporator with this structure, resulting in a decline in customer satisfaction.

Therefore, how to provide an evaporator to effectively improve the heat exchange efficiency and thereby improve customer satisfaction is a technical problem urgently needed to be solved by those skilled in the art.

Contents of the invention

In view of this, the object of the present invention is to provide an evaporator, which can effectively improve heat exchange efficiency, thereby improving customer satisfaction.

Another object of the present invention is to provide a method for controlling the dryness in the tube of the evaporator.

To achieve the above object, the present invention provides the following technical solutions:

An evaporator, comprising a heat exchange tube, and a first header and a second header respectively arranged on both sides of the heat exchange tube, the evaporator is provided with an inlet conduit and an outlet conduit, the first header The inside of the box and the second header are respectively provided with partitions along the direction perpendicular to the axis of the heat exchange tubes, and the partitions on any one of the first headers are connected to the second header The baffles on the evaporator are staggered from each other, and the evaporator is divided into serpentine passages by the baffles, and connecting pipes are also arranged on the first header and/or the second header, so The connecting pipeline includes a first end and a second end, and the first end is connected upstream of the serpentine passage, the second end is connected downstream of the serpentine passage, and the first end and At least one partition is spaced between the second ends, a pressure supply device is also provided on the connecting pipeline, and the upstream of the serpentine passage and the downstream of the serpentine passage are respectively provided with a detection tool. Dryness detection device for quality dryness.

Preferably, the first end and the inlet conduit can be directly communicated through a header on the same side.

Preferably, the inlet conduit and the outlet conduit are arranged on the same side of the evaporator, or the inlet conduit and the outlet conduit are arranged on both sides of the evaporator.

Preferably, the connecting pipeline includes the same first connecting pipeline and second connecting pipeline, and the two ends of the first connecting pipeline are respectively arranged on the first header, and the second connecting pipeline Two ends of the pipeline are respectively arranged on the second header.

Preferably, when the inlet conduit and the outlet conduit are arranged on the same side of the evaporator, the connecting pipeline includes a first connecting pipeline and a second connecting pipeline, and the first connecting pipeline The two ends of the connecting pipeline are respectively connected with the inlet conduit and the first header, and the two ends of the second connecting pipeline are respectively connected with the second header.

Preferably, when the inlet conduit and the outlet conduit are arranged on the same side of the evaporator, the connecting pipeline includes a first connecting pipeline and a second connecting pipeline, and the first connecting pipeline The two ends of the pipe are respectively connected to the inlet conduit and the first header, and the second connecting pipeline is connected to the second header and the outlet conduit.

Preferably, the pressure supply device is a hydraulic pump, or a one-way valve.

A method for controlling dryness in a tube of an evaporator as described above, comprising:

Detecting the dryness of the working fluid upstream of the serpentine passage, and controlling the opening of the pressure supply device when the dryness of the working fluid is lower than a preset dryness value, so that the working fluid downstream of the serpentine passage Quality is transported to the upstream of the serpentine pathway;

Detecting the dryness of the working fluid downstream of the serpentine passage, and controlling the opening of the pressure supply device when the dryness of the working fluid is higher than a preset dryness value, so that the working fluid upstream of the serpentine passage Substances are transported downstream of the serpentine pathway.

Preferably, it also includes, when the dryness of the working fluid is a preset dryness value, controlling the pressure supply device to be closed.

Preferably, the preset dryness value is between 0.4-0.8.

It can be seen from the above technical solutions that the evaporator disclosed in the embodiment of the present invention includes a heat exchange tube, and a first header and a second header respectively arranged on both sides of the heat exchange tube, and the evaporator is provided with an inlet conduit and the outlet duct, the inside of the first header and the second header are also provided with partitions along the direction perpendicular to the axis of the heat exchange tubes, and the partitions on any one of the first headers are connected with the partitions on the second header The plates are staggered from each other, and the partition divides the evaporator into a serpentine passage, and a connecting pipeline is also arranged on the first header and/or the second header, the connecting pipeline includes a first end and a second end, and the second header One end is connected to the upstream of the serpentine passage, and the second end is connected to the downstream of the serpentine passage. There is at least one partition between the first end and the second end, and a pressure supply device is also arranged on the connecting pipeline. The serpentine passage Dryness detection devices for detecting the dryness of the working fluid are also installed upstream and downstream of the serpentine passage respectively.

The dryness detection device detects the dryness of the working fluid upstream of the serpentine passage, and when it detects that the dryness of the upstream working fluid is lower than the preset dryness value, the controller controls the pressure supply device 9 to open, so that the downstream of the serpentine passage The high-dryness working fluid is transported to the upstream of the serpentine passage, and mixed with the low-dryness working fluid upstream of the serpentine passage, so that the dryness of the working fluid reaches the preset dryness value, so that the upstream working fluid entering the heat exchange tube The dryness increases, which increases the heat transfer coefficient upstream of the evaporator; the dryness detection device detects the dryness of the working fluid downstream of the serpentine passage, and when it detects that the dryness of the working fluid is higher than the preset dryness value, the controller Control the opening of the pressure supply device 9, so that the low-dryness working fluid upstream of the serpentine passage is transported to the downstream of the serpentine passage, and mixed with the high-dryness working fluid downstream of the serpentine passage, so that the dryness of the working medium reaches the preset dryness. The degree value, so that the dryness of the working fluid entering the heat exchange tube downstream decreases, and the heat transfer coefficient downstream of the evaporator increases. Therefore, the device can realize the direct adjustment between the upstream working fluid and the downstream working fluid, without going through the middle reaches of the evaporator, so that the heat transfer coefficient of the overall evaporator can be increased, thereby effectively improving the heat exchange efficiency of the evaporator. Improve customer satisfaction.

Description of drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following briefly introduces the drawings that need to be used in the description of the embodiments or the prior art. Obviously, the accompanying drawings in the following description are only It is an embodiment of the present invention, and those skilled in the art can also obtain other drawings according to the provided drawings without creative work.

FIG. 1 is a schematic structural view of the evaporator disclosed in Embodiment 1 of the present invention;

Fig. 2 is a schematic structural view of the evaporator disclosed in Embodiment 2 of the present invention;

Fig. 3 is a schematic structural view of the evaporator disclosed in Embodiment 3 of the present invention;

Fig. 4 is a schematic structural view of the evaporator disclosed in Embodiment 4 of the present invention;

Fig. 5 is the change trend of the dryness of the evaporator pipeline process disclosed in the embodiment of the present invention

schematic diagram;

Fig. 6 is the change of the heat transfer coefficient of the evaporation gas pipeline process disclosed in the embodiment of the present invention

Trend diagram.

Among them, the specific names of each component are as follows:

1-Heat exchange tube, 2-First header, 3-Second header, 4-Inlet conduit, 5-Outlet conduit, 6-Separator, 7-First connecting pipe, 8-Second connecting pipe, 9 - Pressure supply device.

detailed description

In view of this, the core of the present invention is to provide an evaporator, which can effectively improve heat exchange efficiency, thereby improving customer satisfaction.

Another core of the present invention is to provide a method for controlling the dryness in the tube of the evaporator.

In order to enable those skilled in the art to better understand the solution of the present invention, the present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments.

As shown in Figures 1 to 4, the evaporator disclosed in the embodiment of the present invention includes a heat exchange tube 1, and a first header 2 and a second header 3 respectively arranged on both sides of the heat exchange tube 1, the evaporator An inlet conduit 4 and an outlet conduit 5 are arranged on the top, and partitions 6 are respectively arranged inside the first header 2 and the second header 3 along the direction perpendicular to the axis of the heat exchange tube 1, and any one of the first headers 2 The partitions are all staggered with the partitions 6 on the second header 3, and the partitions 6 divide the evaporator into serpentine passages, and there are also connecting devices on the first header 2 and/or the second header 3 The pipeline, the connecting pipeline includes a first end and a second end, and the first end is connected to the upstream of the serpentine passage, the second end is connected to the downstream of the serpentine passage, and there is at least an interval between the first end and the second end A partition 6, a pressure supply device 9 is provided on the connecting pipeline, and a dryness detection device for detecting the dryness of the working fluid is provided on the upstream of the serpentine passage and downstream of the serpentine passage respectively.

It should be explained that the inlet conduit 4 is upstream of the serpentine passage, and the outlet conduit 5 is downstream of the serpentine passage.

The dryness detection device detects the dryness of the working fluid upstream of the serpentine passage, and when it detects that the dryness of the upstream working fluid is lower than the preset dryness value, the controller controls the pressure supply device 9 to open, so that the downstream of the serpentine passage The high-dryness working fluid is transported to the upstream of the serpentine passage, and mixed with the low-dryness working fluid upstream of the serpentine passage, so that the dryness of the working fluid reaches the preset dryness value, so that the upstream working fluid entering the heat exchange tube The dryness increases, which increases the heat transfer coefficient upstream of the evaporator; the dryness detection device detects the dryness of the working fluid downstream of the serpentine passage, and when it detects that the dryness of the working fluid is higher than the preset dryness value, the controller Control the opening of the pressure supply device 9, so that the low-dryness working fluid upstream of the serpentine passage is transported to the downstream of the serpentine passage, and mixed with the high-dryness working fluid downstream of the serpentine passage, so that the dryness of the working medium reaches the preset dryness. The degree value, so that the dryness of the working fluid entering the heat exchange tube downstream decreases, and the heat transfer coefficient downstream of the evaporator increases.

Therefore, the device can realize the direct adjustment between the upstream working fluid and the downstream working fluid, without going through the middle reaches of the evaporator, so that the heat transfer coefficient of the overall evaporator can be increased, thereby effectively improving the heat exchange efficiency of the evaporator. Improve customer satisfaction.

In addition, the following technical effects are also achieved: on the basis of the overall adjustment, the adjustment inside the single heat exchanger is further refined, the adjustment range of the working condition is larger, and the adjustment range is smaller; for the adjustment of some working conditions of the system, It can be achieved by adjusting the dryness control of the evaporator, thereby reducing system energy consumption and unnecessary energy consumption.

It should be noted that the pressure supply device 9 may be a hydraulic pump or a one-way valve.

Further, the first end of the connecting pipeline and the inlet conduit 4 can be directly communicated through a header on the same side. It should be explained that the first end of the connecting pipeline can communicate with the first header 2 arranged on the same side, and the first end of the connecting pipeline can also communicate with the second header 3 arranged on the same side. That is to say no partition 6 is provided between the first end and the inlet conduit.

It should be noted that the inlet conduit 4 and the outlet conduit 5 can be arranged on the same side of the evaporator, and can also be arranged on both sides of the evaporator. Of course, it is convenient for installation. Here, the inlet conduit 4 and the outlet conduit are preferably arranged on the evaporator. on the same side.

Further, the connecting pipe includes the same first connecting pipeline 7 and the second connecting pipeline 8, and the two ends of the first connecting pipeline 7 are respectively arranged on the first header 2, and the two ends of the second connecting pipeline 8 The ends are respectively arranged on the second header 3. With such arrangement, when the dryness adjustment is required, the working medium flow in the first connecting pipeline 7 can be adjusted as required, or the working flow in the second connecting pipeline 8 can be adjusted. Of course, the two connecting pipelines work at the same time, The speed and range of dryness adjustment can be further increased.

It should be noted that when the inlet conduit 4 and the outlet conduit 5 are arranged on the same side of the evaporator, the connecting pipeline includes a first connecting pipeline 7 and a second connecting pipeline 8, and the two connecting pipelines of the first connecting pipeline 7 The two ends of the second connecting pipeline 8 communicate with the inlet conduit 4 and the first header 2 respectively, and the two ends of the second connecting pipeline 8 communicate with the second header 3 respectively. Such setting can save the material for connecting pipelines, and the installation and setting are more convenient.

It should be noted that when the inlet conduit 4 and the outlet conduit 5 are arranged on the same side of the evaporator, the connecting pipeline includes a first connecting pipeline 7 and a second connecting pipeline 8, and the two ends of the first connecting pipeline 7 are respectively The inlet conduit 4 is connected with the first header 2, and the second connecting pipeline 8 is connected with the second header 3 and the outlet conduit 5, so that the dryness of the working fluid can be adjusted more accurately.

It should be noted that the connecting pipe is a circular metal pipe. Of course, it can be a copper pipe or an aluminum pipe. Since the material of the copper pipe is durable and corrosion-resistant, it is preferred that the connecting pipe is a copper pipe here. .

In order to improve the heat exchange effect of the evaporator, the outer cover of the heat exchange tube 1 is provided with a plurality of fins to increase the heat dissipation area.

The embodiment of the invention also discloses a method for controlling the dryness in the tube of the evaporator, including:

Detect the dryness of the working fluid upstream of the serpentine passage, and when the dryness of the working fluid is lower than the preset dryness value, the pressure supply device 9 is controlled to open, so that the working fluid downstream of the serpentine passage is delivered to the bottom of the serpentine passage. upstream;

Detect the dryness of the working fluid downstream of the serpentine passage, and when the dryness of the working fluid is higher than the preset dryness value, control the pressure supply device 9 to open, so that the working fluid upstream of the serpentine passage is delivered to the bottom of the serpentine passage downstream.

The method for controlling the dryness in the tube of the evaporator disclosed in the embodiment of the present invention further includes, when the dryness of the working fluid reaches a preset dryness value, controlling the pressure supply device 9 to close.

The dryness detection device detects the dryness of the working fluid upstream of the serpentine passage, and when it detects that the dryness of the upstream working fluid is lower than the preset dryness value, the controller controls the pressure supply device 9 to open, so that the downstream of the serpentine passage The high-dryness working fluid is transported to the upstream of the serpentine passage, and mixed with the low-dryness working fluid upstream of the serpentine passage, so that the dryness of the working fluid reaches the preset dryness value, so that the upstream working fluid entering the heat exchange tube The dryness increases, which increases the heat transfer coefficient upstream of the evaporator; the dryness detection device detects the dryness of the working fluid downstream of the serpentine passage, and when it detects that the dryness of the working fluid is higher than the preset dryness value, the controller Control the opening of the pressure supply device 9, so that the low-dryness working fluid upstream of the serpentine passage is transported to the downstream of the serpentine passage, and mixed with the high-dryness working fluid downstream of the serpentine passage, so that the dryness of the working medium reaches the preset dryness. degree value, so that the dryness of the working fluid entering the heat exchange tube downstream is reduced, and the heat transfer coefficient located downstream of the evaporator is increased; When the quality and dryness are all preset dryness values, the controller controls the pressure supply device 9 to close, and at this time, the heat transfer coefficient of the upstream of the evaporator and the downstream of the evaporator are the best.

Therefore, the device can realize the direct adjustment between the upstream working fluid and the downstream working fluid, without going through the middle reaches of the evaporator, so that the heat transfer coefficient of the overall evaporator can be increased, thereby effectively improving the heat exchange efficiency of the evaporator. Improve customer satisfaction.

Please refer to Fig. 5 and Fig. 6, through the change trend of working fluid dryness and heat transfer coefficient in the traditional evaporator and the evaporator disclosed in the embodiment of the present invention:

In a traditional evaporator, the dryness of the working fluid in the upstream pipeline is low and the heat transfer coefficient is small; the dryness of the working fluid in the midstream pipeline is high and the heat transfer coefficient is the best; the dryness of the working fluid in the downstream pipeline is high If it is too high, the heat transfer will deteriorate, resulting in a sudden decrease in the heat transfer coefficient.

In the evaporator disclosed in the present invention, the dryness of the working medium in the upstream pipeline suddenly increases, and the heat transfer coefficient is improved; The dryness of the working medium in the road decreases suddenly, the deterioration of heat transfer is suppressed, and the heat transfer coefficient continues to maintain at the optimum value. When the dryness continues to rise to a certain value, the heat transfer deteriorates and the heat transfer coefficient decreases.

Therefore, in the evaporator disclosed in the embodiment of the present invention, by changing the dryness of the working fluid inside the serpentine passage, the upstream low-dryness working fluid and the downstream high-dryness working fluid are mixed and compensated, so that the upstream and downstream The increase of the heat transfer coefficient in the serpentine passage ultimately increases the overall heat transfer coefficient of the evaporator, further improving the heat transfer efficiency of the evaporator.

It should be noted that the preset dryness value is set between 0.4-0.8. In this setting, the heat transfer coefficient of the working fluid can only be increased within the range of the dryness value, thereby improving the heat exchange efficiency.

The evaporator provided in the embodiment of the present invention may be a finned evaporator, but is not limited to a finned evaporator, and may also be a panel evaporator, a shell-and-tube evaporator, and the like.

Each embodiment in this specification is described in a progressive manner, each embodiment focuses on the difference from other embodiments, and the same and similar parts of each embodiment can be referred to each other.

The above description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the invention. Therefore, the present invention will not be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims (10)

1. An evaporator, comprising a heat exchange tube (1), and a first header (2) and a second header (3) respectively arranged on both sides of the heat exchange tube (1), the evaporator An inlet conduit (4) and an outlet conduit (5) are arranged on the top, and it is characterized in that the inside of the first header (2) and the second header (3) are connected with the heat exchange tube (1) The direction perpendicular to the axis is also provided with partitions (6), and the partitions (6) on any one of the first headers (2) are connected with the partitions on the second header (3). The plates (6) are staggered from each other, and the partition (6) divides the evaporator into serpentine passages, and on the first header (2) and/or the second header (3) A connecting pipeline is provided, the connecting pipeline includes a first end and a second end, and the first end is connected upstream of the serpentine passage, and the second end is connected downstream of the serpentine passage , at least one partition (6) is spaced between the first end and the second end, a pressure supply device (9) is also arranged on the connecting pipeline, the upstream of the serpentine passage and the A dryness detection device for detecting the dryness of the working fluid is also provided downstream of the serpentine passage. 2. The evaporator according to claim 1, characterized in that the first end and the inlet conduit (4) can be directly communicated through a header on the same side. 3. The evaporator according to claim 1, characterized in that, the inlet conduit (4) and the outlet conduit (5) are arranged on the same side of the evaporator, or the inlet conduit (4) and The outlet conduits (5) are arranged on both sides of the evaporator. 4. The evaporator according to claim 1, characterized in that, the connecting pipelines include the same first connecting pipeline (7) and second connecting pipeline (8), and the first connecting pipeline Both ends of (7) are respectively arranged on the first header (2), and both ends of the second connecting pipeline (8) are respectively arranged on the second header (3). 5. The evaporator according to claim 3, characterized in that, when the inlet conduit (4) and the outlet conduit (5) are arranged on the same side of the evaporator, the connecting pipeline includes a second A connecting pipeline (7) and a second connecting pipeline (8), and the two ends of the first connecting pipeline (7) respectively communicate with the inlet conduit (4) and the first header (2) , both ends of the second connecting pipeline (8) communicate with the second header (3) respectively. 6. The evaporator according to claim 3, characterized in that, when the inlet conduit (4) and the outlet conduit (5) are arranged on the same side of the evaporator, the connecting pipeline includes a second A connecting pipeline (7) and a second connecting pipeline (8), and the two ends of the first connecting pipeline (7) respectively communicate with the inlet conduit (4) and the first header (2) , the second connecting pipeline communicates with the second header (3) and the outlet conduit (5). 7. The evaporator according to claim 1, characterized in that the pressure supply device (9) is a hydraulic pump. 8. A method for controlling dryness in a tube of an evaporator according to claim 1, characterized in that, comprising: detecting the dryness of the working fluid upstream of the serpentine passage, and controlling the opening of the pressure supply device (9) when the dryness of the working fluid is lower than a preset dryness value, so that the serpentine passage The downstream working fluid is delivered to the upstream of the serpentine passage; detecting the dryness of the working fluid downstream of the serpentine passage, and controlling the opening of the pressure supply device (9) when the dryness of the working fluid is higher than a preset dryness value, so that the serpentine passage The upstream working fluid is delivered to the downstream of the serpentine passage. 9. The method for controlling the dryness in the tube of the evaporator according to claim 8, further comprising, when the dryness of the working medium is a preset dryness value, controlling the pressure supply device (9) closure. 10. The method for controlling the dryness in the tube of the evaporator according to claim 9, wherein the preset dryness value is between 0.4-0.8.

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