CN104879970B - A kind of double centrifugation flash vessels of emptying structure changes - Google Patents

Abstract

The invention provides a double centrifugal separation flash evaporator with variable space and variable structure, which includes a cylinder body and a heat exchange tube. The lower part of the cylinder body and the closed surface of the bottom end form a refrigerant storage area, and the upper part is inserted into the heat exchange tube. The heat exchange tube includes a straight section of the plain pipe and a threaded section sleeved on the outside of the lower end of the straight section of the plain pipe. The first refrigerant inlet pipe is led out, the gas phase outlet pipe is led out from the position where the straight section of the bare pipe exposes the cylinder body, and the second refrigerant outlet pipe whose outlet end is exposed to the top of the straight section of the bare pipe is arranged along the central axis of the heat exchange tube, The inlet end of the second refrigerant outlet pipe is placed in the refrigerant storage area, and the mouths of the first refrigerant inlet pipe and the gas phase outlet pipe both face the outlet end of the second refrigerant outlet pipe. It can completely solve the gas-liquid separation to ensure that the refrigerant entering the compressor does not contain liquid, so as to ensure the energy-efficient, reliable and stable operation of the entire system.

Description

A Double Centrifugal Separation Flash Evaporator with Variable Space and Variable Structure

technical field

The invention relates to the technical field of an air-injection enthalpy-increasing air conditioner or system, in particular to a double centrifugal separation flash evaporator with variable space and variable structure.

Background technique

Air-injection enthalpy-increasing high-efficiency energy-saving air conditioners or systems need to use flash evaporators for complete gas-liquid separation to ensure that the refrigerant entering the air-injection enthalpy-increasing port of the compressor does not contain liquid. Therefore, the flash evaporator is an important part of the high-efficiency and energy-saving air-conditioning system with air injection, and its design quality has an important impact on the efficiency and reliable operation of the entire system. However, the existing flash evaporator still has the problem of incomplete gas-liquid separation.

Contents of the invention

The object of the present invention is to propose a double centrifugal separation flasher with variable space and variable structure, which is used to completely separate the gas and liquid two phases in the flasher.

In order to solve the problems of the technologies described above, the technical solution of the present invention is as follows:

A double centrifugal separation flash evaporator with variable space and variable structure, including a cylinder body and a heat exchange tube, the closed surface of the lower part of the cylinder body and the bottom end forms a refrigerant storage area, the upper part is inserted into the heat exchange tube, and the heat exchange tube It includes a straight section of the light pipe and a threaded section sleeved on the outer side of the lower end of the straight section of the light pipe, the straight section of the light pipe is exposed from the top of the cylinder, and a first gathering part is arranged on the outer wall of the straight section of the light pipe and the top of the cylinder , lead out the first refrigerant inlet pipe from the gap between the straight section of the light pipe and the upper part of the cylinder, and lead out the gas phase outlet pipe from the part where the straight section of the light pipe exposes the cylinder, and set along the central axis of the heat exchange tube The outlet end exposes the second refrigerant outlet pipe at the top of the straight section of the light pipe, and a second gathering part is arranged on the outer wall of the second refrigerant outlet pipe and the top of the straight section of the light pipe, and the inlet end of the second refrigerant outlet pipe is placed on the refrigerant In the storage area, and the nozzles of the first refrigerant inlet pipe and the gas phase outlet pipe are both facing the outlet end of the second refrigerant outlet pipe.

The heat exchange tube is divided into a straight section of the plain tube and a threaded section with high-efficiency heat exchange effect, forming a high-efficiency heat-exchange threaded variable-diameter tube. The degree of fluid turbulence allows the fluids on each side to be fully mixed, enhancing heat transfer.

The inner diameter of the upper part of the cylinder is equal to the outer diameter of the straight section of the light pipe, the diameter of the lower part of the cylinder is larger than that of the upper part of the cylinder, and the upper part of the cylinder and the lower part of the cylinder are connected by a tapered transition surface. Compared with the upper part, the lower part of the cylinder forms a different-diameter expansion section, which is more conducive to the flash evaporation of the fluid.

The lower end surface of the thread segment is flush with the upper end surface of the tapered transition surface. The upper part of the cylinder and the threaded section of the heat exchange tube can form a longer fluid tube path to fully exchange heat during the flow.

The part where the first refrigerant inlet pipe connects with the cylinder body is set as the first bent pipe section, and the part where the gas phase outlet pipe connects with the straight section of the bare pipe is set as the second bent pipe section. It can decelerate the fluid in the elbow section and reduce the impact of flushing on the flasher when the fluid enters and exits.

The gas phase outlet pipe and the first refrigerant inlet pipe are respectively located on two opposite sides of the second refrigerant outlet pipe. It can make the force of the refrigerant entering and the gas phase flowing out on the flash evaporator relatively balanced, and keep the flash evaporator stable.

Compared with the existing similar technology, the double centrifugal separation flash evaporator with variable space and variable structure of the present invention has the following advantages:

1. The heat exchange tube in the cylinder adopts high-efficiency heat-exchange threaded variable-diameter tubes, which have the characteristics of double-sided enhanced heat transfer and internal and external double-sided rotation separation. The fluid flows continuously along the tube wall flow direction inside and outside the high-efficiency heat-exchanged threaded variable-diameter tubes. , the heat transfer boundary layer of the tube wall fluid is destroyed, and the heat transfer resistance is small;

2. The high-efficiency heat-exchange threaded variable-diameter tube is closely matched with the inner side of the cylinder, and the gap is small, and the twisted surface of the high-efficiency heat-exchange threaded variable-diameter tube flow path is continuous and smooth. Compared with other forms of enhanced heat transfer tubes, the flow resistance is relatively low. Low, high fluid velocity;

3. The lower part of the cylinder is equipped with a different-diameter expansion section, which is more conducive to the flash evaporation of the fluid;

The double centrifugal separation flash evaporator with variable space and variable structure provided by the present invention is applied to the high-efficiency energy-saving air-conditioning system with air injection and enthalpy increase, especially suitable for extremely low temperature or extremely high temperature working environment, and can completely solve the gas-liquid separation to ensure the refrigerant entering the compressor Does not contain a liquid state, thus ensuring energy efficient, reliable and stable operation of the entire system.

Description of drawings

Fig. 1 is a perspective schematic front view of the overall structure of the present invention;

Fig. 2 is a schematic top view of the overall structure of the present invention;

Fig. 3 is a schematic left view of the overall structure of the present invention;

Explanation of reference signs: 1. Cylinder body; 2. First refrigerant inlet pipe; 3. Second refrigerant outlet pipe; 4. Gas phase outlet pipe; 5. Heat exchange pipe.

detailed description

In order to make the above objects, features and advantages of the present invention more comprehensible, the present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments.

Example

As shown in Figures 1 to 3, a double centrifugal separation flash evaporator with variable space and variable structure includes a cylinder body 1 and a heat exchange tube 5, and the lower part of the cylinder body 1 and the closed surface 130 at the bottom end form a refrigerant storage area , the upper part is inserted into the heat exchange tube 5, the heat exchange tube 5 includes a straight section 520 of a plain tube and a threaded section 510 sleeved outside the lower end of the straight section 520 of the plain tube, the straight section 520 of the plain tube extends from the top of the cylinder body 1 It is exposed, and the first gathering part 110 is set on the outer wall of the straight section 520 of the light pipe and the top of the cylinder body 1, and the first refrigerant inlet pipe 2 is drawn out from the gap between the straight section 520 of the light pipe and the upper part of the cylinder body 1. The gas phase outlet pipe 4 is led out from the part of the tube straight section 520 exposed from the cylinder body 1, and the second refrigerant outlet pipe 3 with the outlet end 320 exposed on the top of the bare tube straight section 520 is arranged along the central axis of the heat exchange tube 5, and The outer wall of the second refrigerant outlet pipe 3 and the top of the straight section 520 of the light pipe are provided with a second gathering part 530, the inlet end 310 of the second refrigerant outlet pipe 3 is placed in the refrigerant storage area, and the first refrigerant inlet pipe 2 and The mouths of the gas phase outlet pipes 4 all face the outlet end 320 of the second refrigerant outlet pipe 3 .

The flash evaporator of this embodiment is introduced below. As shown in the figure, the flash evaporator includes a cylinder 1, where the upper opening of the cylinder 1 is closely connected with the heat exchange tube 5, and a conical transition surface 120 is provided at the upper and lower parts of the cylinder 1, and the bottom end of the cylinder 1 is set to be closed. Surface 130; the first refrigerant inlet pipe 2 is arranged on one side of the upper part of the cylinder body 1, with the nozzle facing upwards, and an elbow section 210 is provided before connecting with the cylinder body 1, and the end 220 extends into the cylinder body 1, and the heat exchange tube 5 outside the straight section 520 of the light pipe; the outlet end 320 of the second refrigerant outlet pipe 3 is set upwards, the inlet end 310 is suspended from the bottom of the cylinder 1, and the center of the cylinder 1 and the heat exchange tube 5 extends into it. (As shown in Figure 2, the outlet end 320 of the second refrigerant outlet pipe 3 can be seen); the gas phase outlet pipe 4 is arranged on the other side of the upper part of the cylinder body 1, and is 180° opposite to the first refrigerant inlet pipe 2. Set upwards, before connecting with the high-efficiency heat exchange tube 5, there is an elbow section 410, and the end 420 extends into the straight section 520 of the high-efficiency heat exchange tube 5; the lower part of the high-efficiency heat exchange tube 5 is a threaded section 510, and it The upper part of the tapered transition surface 120 of the body 1 is flush, and the upper part is set as a straight section 520 of the light pipe, and a gathering part 530 is set at the connection with the second refrigerant outlet pipe 3, and the high-efficiency heat exchange tube 5 extends into it from the center of the cylinder body 1 (As shown in Fig. 2, the top 540 of the high-efficiency heat exchange tube 5 can be seen).

Compared with the same type of products, the double centrifugal separation flash evaporator with variable space and variable structure of the present invention adds a section of threaded variable diameter tube with high-efficiency heat exchange effect in the flash evaporator cylinder 1, and when the fluid flows through the high-efficiency heat exchange thread When the surface of the reducing tube is adjusted, the turbulent flow of the inner and outer fluids is strengthened, so that the fluids on each side can be fully mixed, and the heat transfer is enhanced. The specific high-efficiency heat exchange threaded pipe size, number of thread heads, thread depth, pitch and helix can be determined according to the precise design and calculation of the supporting products.

When the double centrifugal separation flasher with variable space and variable structure of the present invention is used in an air-injection enthalpy-increasing high-efficiency energy-saving air-conditioning system, or when it is used in a heat pump enthalpy-increasing system, its specific working process and principle are as follows:

The first refrigerant enters the flash evaporator from the first refrigerant inlet pipe 2 , and after flowing through the elbow section 210 , the flow velocity of the fluid is weakened, thereby reducing the impact on the high-efficiency heat exchange tube 5 when entering the flash evaporator. After the first refrigerant enters the flash evaporator, it flows downward along the threaded section 510 of the high-efficiency heat exchange tube 5 to generate a swirl flow. Through precise design calculations, the size, number of thread heads, thread depth, and pitch of the heat exchange tube 5 are set. Specific parameters such as the spiral and spiral, the flow velocity of the fluid is reasonably strengthened, and the refrigerant flows in a turbulent flow, which strengthens the heat transfer with the gas-phase refrigerant passing through the partition wall of the heat exchange tube 5 .

The high-speed flowing first refrigerant flows along the flow channel of the high-efficiency heat exchange tube 5. Due to the action of centrifugal force, the first refrigerant will continue to flow downward along the inner wall of the cylinder 1 after detaching from the high-efficiency heat exchange tube 5 until the bottom of the cylinder 1 On the end closure surface 130. With the continuous increase of the first refrigerant and the continuous increase of the partial pressure of the gas phase, the refrigerant enters the inlet port 310 of the second refrigerant outlet pipe 3, and finally is discharged through the outlet port 320 of the second refrigerant outlet pipe 3. After entering the system, the cycle continues Work.

After the first refrigerant enters the refrigerant storage area in the expansion space at the lower part of the flash evaporator, it starts flashing and evaporating, and the gas-liquid separation begins. The evaporated gas-phase refrigerant flows from bottom to top, and after entering the heat exchange tube 5, due to the influence of the inner wall of the threaded section 510, the gas-phase refrigerant begins to turbulence and is continuously strengthened, and the gas-phase refrigerant continuously absorbs the first refrigerant through the partition wall of the heat exchange tube 5 The heat will completely vaporize the mist refrigerant in the gas phase refrigerant.

At the same time, after the refrigerant enters the second refrigerant outlet pipe 3, it exchanges heat with the gas-phase refrigerant outside the pipe through the partition wall of the second refrigerant outlet pipe 3, and the heat of the refrigerant in the pipe is absorbed by the gas-phase refrigerant outside the pipe to be cooled. After the refrigerant absorbs the heat of the refrigerant in the tube, a small amount of mist refrigerant in the gas phase refrigerant will be more completely vaporized.

The gas-phase refrigerant breaks away from the threaded section 510 of the heat exchange tube 5 and enters the straight section 520 of the bare tube, then passes through the bent section 410 and is discharged from the gas-phase outlet pipe 4, connects to the air injection enthalpy increasing port of the compressor, and finally enters the compressor to work.

The double centrifugal separation flash evaporator with variable space and variable structure provided by the present invention is applied to the high-efficiency energy-saving air-conditioning system with air injection and enthalpy increase, especially suitable for extremely low temperature or extremely high temperature working environment, and can completely solve the gas-liquid separation to ensure the refrigerant entering the compressor Does not contain a liquid state, thus ensuring energy efficient, reliable and stable operation of the entire system.

The above detailed description is a specific description of the feasible embodiment of the present invention. This embodiment is not used to limit the patent scope of the present invention. Any equivalent implementation or change that does not deviate from the present invention should be included in the patent scope of this case. middle.

Claims (5)

1. A double centrifugal flash evaporator with variable space and variable structure, comprising a cylinder and a heat exchange tube, characterized in that: the lower part of the cylinder and the closed surface of the bottom end form a refrigerant storage area, and the upper part is inserted into the heat exchange tube The heat exchange tube includes a straight section of the plain tube and a threaded section sleeved on the outside of the lower end of the straight section of the plain tube. The top of the body is exposed, and a first gathering part is set on the outer wall of the straight section of the light pipe and the top of the cylinder, and the first refrigerant inlet pipe is drawn out from the gap between the straight section of the light pipe and the upper part of the cylinder, and from the straight section of the light pipe A gas-phase outlet pipe is drawn from the part exposed to the cylinder, and a second refrigerant outlet pipe whose outlet end exposes the top of the straight section of the light pipe is provided along the central axis of the heat exchange tube, and the outer wall of the second refrigerant outlet pipe is connected to the light pipe. The top of the straight section of the pipe is provided with a second gathering part, the inlet end of the second refrigerant outlet pipe is placed in the refrigerant storage area, and the nozzles of the first refrigerant inlet pipe and the gas phase outlet pipe are both facing the outlet end of the second refrigerant outlet pipe . 2. The double centrifugal separation flash evaporator with variable space and variable structure according to claim 1 is characterized in that: the inner diameter of the upper part of the cylinder body is equal to the outer diameter of the straight section of the bare pipe, and the diameter of the lower part of the cylinder body It is larger than the upper part of the cylinder body, and the upper part of the cylinder body and the lower part of the cylinder body are connected by a tapered transition surface. 3. The double centrifugal separation flash evaporator with variable space and variable structure according to claim 2, characterized in that: the lower end surface of the threaded section is flush with the upper end surface of the tapered transition surface. 4. The double centrifugal flash evaporator with variable space and variable structure according to claim 1, 2 or 3, characterized in that: the part where the first refrigerant inlet pipe connects with the cylinder is set as the first elbow section, The part where the gas phase outlet pipe connects with the straight section of the light pipe is set as the second bent pipe section. 5. The double centrifugal flash evaporator with variable space and variable structure according to claim 1, 2 or 3, characterized in that: the gas phase outlet pipe and the first refrigerant inlet pipe are respectively located on two opposite sides of the second refrigerant outlet pipe .