CN215765865U

CN215765865U - Evaporator containing gas-liquid separation air suction pipeline

Info

Publication number: CN215765865U
Application number: CN202121782771.2U
Authority: CN
Inventors: 查鹏志; 张林波; 朱海晶; 方领
Original assignee: Mcquay Air Conditioning and Refrigeration Wuhan Co Ltd
Current assignee: Mcquay Air Conditioning and Refrigeration Wuhan Co Ltd
Priority date: 2021-08-02
Filing date: 2021-08-02
Publication date: 2022-02-08
Anticipated expiration: 2031-08-02

Abstract

The utility model relates to an evaporator containing a gas-liquid separation air suction pipeline, which comprises a cylinder body, an evaporator air outlet pipe arranged at the upper end of the cylinder body, tube plates arranged at two ends of the cylinder body and a gas-liquid separation air suction pipeline arranged at the upper end of the cylinder body, wherein the air suction pipeline is arranged at the evaporator air outlet pipe. A gas-liquid separation suction pipeline is designed between an evaporator gas outlet pipe and a compressor, the direction of a gas-liquid two-phase refrigerant is changed, the gas-liquid two-phase refrigerant is efficiently separated through the suction pipeline, and only the gas-liquid refrigerant finally enters the compressor, so that the risk of liquid impact of the compressor is effectively avoided. The utility model has the advantages of high adaptability, good effect of preventing the phenomenon of low liquid impact or exhaust superheat degree, high reliability and difficult damage to the air conditioner set.

Description

Evaporator containing gas-liquid separation air suction pipeline

Technical Field

The utility model relates to the technical field of evaporators, in particular to an evaporator with a gas-liquid separation suction pipeline.

Background

The evaporator serving as one of four major components of an air conditioning system is designed to be of great importance, if the evaporator is not designed reasonably, the heat exchange effect is not ideal, the liquid refrigerant cannot be completely evaporated into a gas state, the liquid refrigerant can possibly enter a compressor to form the phenomenon of liquid impact or low exhaust superheat degree, so that the unit operation is unstable, and the compressor can be damaged. Therefore, how to reasonably design the evaporator is very important and is also a key factor influencing the reliability of the normal operation of the air conditioning system and the service life of the compressor.

The current evaporimeter that prevents takes liquid mainly adopts gas board, baffle or filter screen structure, has following shortcoming: the gas homogenizing plate, the baffle plate or the filter screen needs to be welded inside the evaporator, the processing technology is complex, the welding quality requirement is high, when the evaporator cylinder is small, the welding quality is difficult to guarantee, and the adaptability is poor; when the safety distance between the liquid level of the evaporator and the gas homogenizing plate and the safety distance between the liquid level of the evaporator and the safety distance between the liquid level of the evaporator; the speed of the air suction port accessory is high, and the air equalizing plate and the baffle plate cause large pressure drop of the evaporator, so that the performance of the unit is influenced. In conclusion, the prior art has the defects of poor adaptability, poor effect of preventing the phenomenon of low liquid impact or exhaust superheat degree, poor reliability and easy damage to an air conditioner unit.

SUMMERY OF THE UTILITY MODEL

The utility model aims to provide an evaporator containing a gas-liquid separation suction pipeline, which has the advantages of high adaptability, good effect of preventing liquid impact or low exhaust superheat degree, high reliability and capability of ensuring the normal operation of a unit.

In order to achieve the purpose, the evaporator with the gas-liquid separation air suction pipeline comprises a cylinder, an air outlet hole is formed above the cylinder, an evaporator air outlet pipe is arranged above the air outlet hole, tube plates are arranged at two ends of the cylinder, the air suction pipeline is arranged at the upper end of the cylinder for gas-liquid separation, and the air suction pipeline is arranged at the air outlet pipe of the evaporator. Through the structural design of the gas-liquid separation suction pipeline, the direction of gas-liquid two-phase refrigerants is changed, after the gas-liquid two-phase refrigerants collide through the bent pipe of the suction pipeline, the speed and the direction of the gas-liquid refrigerants are inconsistent, the suction pipeline has enough space, so that the refrigerants are separated from the gas-liquid refrigerants, and meanwhile, due to the on-way resistance action of the suction pipeline, a few parts of the liquid refrigerants are gasified, so that the efficient separation of the gas-liquid two-phase refrigerants is realized, the risk of liquid impact of a compressor is effectively avoided, the reliability is high, and meanwhile, the gas-liquid separation suction pipeline is simple in structure and high in adaptability.

Preferably, the air suction pipeline comprises a second bent pipe bent upwards, a third bent pipe and a fourth bent pipe bent downwards, a vertical pipe and a second horizontal straight pipe; one end of the second bent pipe is fixedly connected with an air outlet pipe of the evaporator, two ends of the vertical pipe are respectively connected with the other end of the second bent pipe and the third bent pipe, and two ends of the second horizontal straight pipe are respectively connected with the third bent pipe and the fourth bent pipe. When gas-liquid two-phase refrigerant from the air outlet pipe of the evaporator enters the second bent pipe of the air suction pipeline, the liquid refrigerant collides with the wall of the bent pipe, the direction of liquid drops is changed, a part of liquid drops flow to the cylinder body of the evaporator along the cylinder wall under the action of gravity, and the other part of liquid drops are continuously separated; when the gas-liquid two-phase refrigerant passes through the vertical pipe, the density and gravity of the gas-liquid two-phase refrigerant and the liquid drops are different, so that the flow velocity is inconsistent. And enough gas-liquid separation space is provided, and meanwhile, part of liquid refrigerant is gasified due to the influence of on-way resistance; when the refrigerant passes through the third bent pipe, only a small amount of liquid drops are impacted again, the direction of the liquid drops is changed, the liquid drops flow to the evaporator barrel along the pipe wall, and after gas-liquid separation, only gaseous refrigerant passes through the second horizontal straight pipe and the fourth bent pipe and then enters the compressor suction cavity, so that no liquid refrigerant exists in the compressor, the liquid impact phenomenon is effectively prevented, and the normal operation of a unit is ensured.

As the preferred scheme, the distances from the center line of the air outlet hole on the evaporator cylinder to the tube plates at the two ends are more than or equal to 150mm, and the manufacturing is convenient by considering factors such as internal parts of the evaporator, welding seam gaps and the like. And the suction of the air outlet pipe of the evaporator is large, if the air outlet pipe of the evaporator is too close to the tube plate, the liquid refrigerant does not have enough time and space to be converted into the gaseous refrigerant, and the excessive liquid refrigerant is easy to enter the air suction pipeline. The verification proves that when the distances from the central line of the air outlet hole of the evaporator to the tube plates at the two ends are both larger than 150mm, the liquid refrigerant can be effectively reduced from entering the air suction pipeline.

Preferably, a liquid blocking ring for changing the flowing direction of the refrigerant is arranged in the vertical pipe, and the liquid blocking ring is perpendicular to the vertical pipe. The liquid blocking ring is circular, and the width of the circular ring is larger than or equal to 5 mm. When the gas-liquid two-phase refrigerant passes through the annular liquid blocking ring, the refrigerant collides with the annular wall, the direction of liquid drops is changed, a part of liquid drops flow to the barrel body of the evaporator along the barrel wall under the action of gravity, and the other part of liquid drops are continuously separated.

Preferably, a liquid baffle plate for changing the flowing direction of the refrigerant is arranged in the cylinder body, and the liquid baffle plate is perpendicular to the tube plate. The liquid baffle plate is rectangular, one end close to the evaporator air outlet pipe is not provided with an air hole, the middle part of the liquid baffle plate is provided with a small air hole, and one end far away from the evaporator air outlet pipe is provided with a large air hole. Because the suction of the evaporator air outlet pipe is large, one end close to the evaporator air outlet pipe is not provided with a breather hole, the middle part is provided with a small breather hole, and one end far away from the evaporator air outlet pipe is provided with a large breather hole, the risk that liquid refrigerant enters the air suction pipeline can be effectively reduced. When the gas-liquid two-phase refrigerant passes through the rectangular liquid baffle plate, the gas-liquid two-phase refrigerant collides with the wall of the liquid baffle plate, the direction of the liquid drops is changed, one part of liquid drops are remained in the barrel of the evaporator under the action of gravity, the other part of liquid drop refrigerant enters the air suction pipeline through the air holes, and the direction of the gas state and the liquid drop refrigerant is changed through the elbow, so that the effect of gas-liquid separation is achieved, the influence of pressure drop of the other pipeline is that the minimum part of liquid drop refrigerant is flashed into the gas state, the gas state refrigerant is ensured to enter the compressor, and the risk of liquid carrying in air suction is reduced.

Preferably, the air outlet pipe of the evaporator is provided with a first bent pipe and a first horizontal straight pipe connected with the first bent pipe. When the gas-liquid two-phase refrigerant separated from the cylinder body passes through the first bent pipe, the liquid refrigerant collides with the wall of the bent pipe, the direction of liquid drops is changed, a part of liquid drops fall back into the cylinder body of the evaporator under the action of gravity, and other gas-liquid two-phase refrigerants flow into the air suction pipe through the first horizontal straight pipe.

As a preferred scheme, a plurality of heat exchange tubes are connected on the tube plates at two ends of the cylinder in an expanded mode, the height of the tube bank is generally not higher than the center line of the cylinder, the refrigerant flows in the heat exchange tubes, and the refrigerant flows out of the heat exchange tubes and submerges the heat exchange tubes, so that the heat exchange effect is guaranteed.

The utility model has the advantages that: a gas-liquid separation suction pipeline is designed between an evaporator gas outlet pipe and a compressor, the direction of a gas-liquid two-phase refrigerant is changed, the gas-liquid two-phase refrigerant is efficiently separated through the suction pipeline, and in addition, few liquid drops are flashed into a gas state in the suction pipe, so that only the gas refrigerant finally enters the compressor, and the risk of liquid impact of the compressor is effectively avoided. The utility model has the advantages of high adaptability, good effect of preventing the phenomenon of low liquid impact or exhaust superheat degree, high reliability and difficult damage to the compressor of the air conditioning unit.

Drawings

FIG. 1 is a schematic plan view of an evaporator in accordance with example 1 including a gas-liquid separation suction line;

FIG. 2 is a schematic plan view of an evaporator of example 2 including a gas-liquid separation suction line;

FIG. 3 is a schematic plan view of the structure of an evaporator in accordance with example 3 including a gas-liquid separation suction line;

FIG. 4 is a schematic plan view of the liquid baffle of FIG. 3;

FIG. 5 is a schematic view of the liquid baffle of FIG. 4 with circular arc baffles on both sides;

the components in the figures are numbered as follows: the air suction device comprises a cylinder body 1, an air suction pipeline 2, a second bent pipe 21, a vertical pipe 22, a third bent pipe 23, a second horizontal straight pipe 24, a fourth bent pipe 25, a liquid blocking ring 26, an evaporator air outlet pipe 3, a pipe plate 4, a heat exchange pipe 41, a first bent pipe 5, a first horizontal straight pipe 6, a liquid blocking plate 7, a small air hole 71, a large air hole 72 and an arc baffle 73.

Detailed Description

For better understanding of the present invention, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments.

The evaporator provided with the gas-liquid separation air suction pipeline provided by the utility model is concretely shown in the following figure.

Example 1

As shown in fig. 1, the evaporator with the gas-liquid separation air suction pipeline comprises a cylinder 1, a first bent pipe 5 which is arranged at the upper part of the cylinder 1 and is bent downwards, a first horizontal straight pipe 6 connected with the first bent pipe 5, an air outlet pipe 3 which is formed by the first bent pipe 5 and the first horizontal straight pipe 6, tube plates 4 which are arranged at two ends of the cylinder 1, and an air suction pipeline 2 which is arranged at the upper end of the cylinder 1 and is used for gas-liquid separation, wherein the air suction pipeline 2 is arranged at the air outlet pipe 3 of the evaporator, and the distance from the central line of an air outlet hole of the evaporator to the tube plates 4 at the two ends is more than or equal to 150 mm.

The air suction pipeline 2 comprises a second bent pipe 21 bent upwards, a third bent pipe 23 and a fourth bent pipe 25 bent downwards, a vertical pipe 22 and a second horizontal straight pipe 24; one end of the second bent pipe 21 is welded or flange-connected with the evaporator air outlet pipe 3, two ends of the vertical pipe 22 are respectively connected with the other end of the second bent pipe 21 and the third bent pipe 23, and two ends of the second horizontal straight pipe 24 are respectively connected with the third bent pipe 23 and the fourth bent pipe 25. The other end of the fourth elbow 25 is connected to the compressor.

The length of the vertical pipe 22 can be lengthened again, so that the on-way resistance of the gas-liquid two-phase refrigerant is increased, the probability of gasification and falling of the liquid refrigerant is increased, and the liquid refrigerant is prevented from being brought into the compressor by high-speed fluid.

The outer diameter of the air suction pipeline is 114mm, the inner diameter of the air suction pipeline is 102mm, the wall thickness of a single side of the air suction pipeline is 6mm, or the size of the air suction pipeline can be matched with the size of an air suction pipe according to the air suction caliber advance performance of a compressor.

The tube plates 4 at two ends of the cylinder 1 are connected with a plurality of heat exchange tubes 41 in an expanding way, and the tube rows of the heat exchange tubes 41 are generally not higher than the center line of the cylinder.

The arrows in the figure indicate the flow paths of the gas-liquid two-phase refrigerant.

Example 2

As shown in fig. 2, the evaporator with the gas-liquid separation suction line according to embodiment 2 includes all the components of embodiment 1, and further includes a liquid-blocking ring 26 for changing the flow direction of the refrigerant, wherein the liquid-blocking ring 26 is welded in the vertical tube 22, and the liquid-blocking ring 26 is perpendicular to the vertical tube 22.

The liquid blocking ring 26 is annular, and the width of the annular ring is greater than or equal to 5 mm.

Example 3

As shown in fig. 3, the evaporator including the gas-liquid separation suction line according to embodiment 3 includes all the components according to embodiment 2, and further includes a liquid baffle 7 for changing a flow direction of the refrigerant, the liquid baffle 7 is welded in the cylinder 1, the liquid baffle 7 is perpendicular to the tube plate 4, and the liquid baffle 7 is located above the liquid refrigerant in the cylinder 1 and is spaced from the liquid refrigerant by a certain safety distance.

As shown in fig. 4, the liquid baffle 7 is rectangular, and a plurality of air holes are formed on the end surface. The liquid baffle 7 has no air hole near the end of the evaporator air outlet pipe 3, a small air hole 71 is arranged in the middle, and a large air hole 72 is arranged at the end far from the evaporator air outlet pipe 3. After the liquid refrigerant is converted into the gaseous refrigerant, the gaseous refrigerant can more easily enter the air suction pipeline 2 from the air outlet pipe 3 of the evaporator.

As shown in fig. 5, the arc baffles 73 are added on the two sides of the liquid baffle in fig. 4, and the arc openings face the direction of the liquid refrigerant in the cylinder 1, so that liquid drops on the two sides of the liquid baffle close to the tube plate can be effectively prevented from entering the air suction pipe, and the risk of liquid entrainment in the air suction pipe is further reduced.

The working principle of the evaporator comprising the gas-liquid separation air suction pipeline is as follows:when the gas-liquid two-phase refrigerant in the cylinder 1 passes through the rectangular liquid baffle plate 7, the gas-liquid two-phase refrigerant collides with the liquid baffle plate 7, the direction of liquid drops is changed, a part of liquid drops are remained in the evaporator cylinder 1 due to the action of gravity, the other part of liquid drop refrigerant enters the first bent pipe 5 through the air holes 71, after the liquid refrigerant collides with the wall of the bent pipe, the direction of the liquid drops is changed, a part of liquid drops fall back into the evaporator cylinder 1 due to the action of gravity, and other gas-liquid two-phase refrigerants flow into the air suction pipeline 2 through the first horizontal straight pipe 6; when the gas-liquid two-phase refrigerant from the air outlet pipe 3 of the evaporator enters the second bent pipe 21 of the air suction pipeline 2, the liquid refrigerant collides with the wall of the elbow, the direction of liquid drops is changed, and a part of liquid drops are caused by the liquid dropsThe liquid drops flow into the evaporator cylinder 1 along the wall of the cylinder under the action of gravity, and the other part of the liquid drops are continuously separated; when the gas-liquid two-phase refrigerant passes through the vertical pipe 22, the gas-liquid two-phase refrigerant collides with the annular wall of the annular liquid baffle ring 26 welded in the vertical pipe 22, the direction of the liquid drops is changed, a part of the liquid drops flow into the evaporator cylinder 1 along the pipe wall under the action of gravity, the other part of the liquid drops are continuously separated along the vertical pipe 22, part of kinetic energy is converted into potential energy, the flow rate of the gas-liquid two-phase liquid refrigerant is reduced, an enough gas-liquid separation space is provided, and meanwhile, part of the liquid refrigerant is gasified or flashed under the influence of on-way resistance; when the refrigerant passes through the third bent pipe 23, only a small amount of liquid drops collide again, the liquid drops flow into the evaporator cylinder 1 along the pipe wall, after gas-liquid thorough separation, only gaseous refrigerant enters the compressor after passing through the second horizontal straight pipe 24 and the fourth bent pipe 25, and the compressor is ensured to be free of liquid refrigerant, so that the liquid impact phenomenon is effectively prevented, and the normal operation of the unit is ensured.

The gas-liquid separation-containing suction pipeline is not only suitable for a flooded evaporator, but also suitable for a falling film evaporator.

The above-mentioned embodiments only express several embodiments of the present invention, and the description thereof is more specific and detailed, but not construed as limiting the scope of the present invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the inventive concept, which falls within the scope of the present invention. Therefore, the protection scope of the present patent shall be subject to the appended claims.

Claims

1. The utility model provides an evaporimeter that contains gas-liquid separation pipeline of breathing in, includes barrel (1), and barrel (1) top is equipped with the venthole, is equipped with evaporimeter outlet duct (3) on the venthole, sets up tube sheet (4) at barrel (1) both ends, its characterized in that: the device also comprises a gas-liquid separation gas suction pipeline (2) arranged at the upper end of the cylinder body (1), wherein the gas suction pipeline (2) is arranged at the gas outlet pipe (3) of the evaporator; the air suction pipeline (2) comprises a second bent pipe (21) bent upwards, a third bent pipe (23) and a fourth bent pipe (25) bent downwards, a vertical pipe (22) and a second horizontal straight pipe (24); second return bend (21) one end and evaporimeter outlet duct (3) fixed connection, vertical pipe (22) both ends are connected with second return bend (21) other end and third return bend (23) respectively, horizontal straight tube of second (24) both ends are connected with third return bend (23) and fourth return bend (25) respectively.

2. The evaporator with a gas-liquid separation suction line according to claim 1, wherein: the distance from the center line of the air outlet hole on the evaporator cylinder body (1) to the tube plates (4) at the two ends is more than or equal to 150 mm.

3. The evaporator with a gas-liquid separation suction line according to claim 1, wherein: a liquid blocking ring (26) used for changing the flowing direction of the refrigerant is arranged in the vertical pipe (22), and the liquid blocking ring (26) is perpendicular to the vertical pipe (22).

4. The evaporator with a gas-liquid separation suction line according to claim 3, wherein: the liquid blocking ring (26) is annular, and the width of the annular is greater than or equal to 5 mm.

5. The evaporator with a gas-liquid separation suction line according to claim 1, wherein: a liquid baffle plate (7) used for changing the flowing direction of the refrigerant is arranged in the cylinder body (1), and the liquid baffle plate (7) is perpendicular to the tube plate (4).

6. The evaporator with a gas-liquid separation suction line according to claim 5, wherein: the liquid baffle plate (7) is rectangular, one end close to the evaporator air outlet pipe (3) is not provided with an air hole, the middle part of the liquid baffle plate is provided with a small air hole (71), and one end far away from the evaporator air outlet pipe (3) is provided with a large air hole (72).

7. The evaporator with a gas-liquid separation suction line according to claim 1, wherein: the evaporator air outlet pipe (3) is provided with a first bent pipe (5) and a first horizontal straight pipe (6) connected with the first bent pipe (5).

8. The evaporator with a gas-liquid separation suction line according to claim 1, wherein: and a plurality of heat exchange tubes (41) are expanded and connected to the tube plates (4) at the two ends of the cylinder (1).