WO2020006992A1

WO2020006992A1 - Liquid distributor, falling film evaporator, and air conditioner

Info

Publication number: WO2020006992A1
Application number: PCT/CN2018/121883
Authority: WO
Inventors: 张治平; 马严; 胡东兵; 胡海利
Original assignee: 珠海格力电器股份有限公司
Priority date: 2018-07-02
Filing date: 2018-12-19
Publication date: 2020-01-09
Also published as: CN108709339A

Abstract

A liquid distributor (200), a falling film evaporator (10), and an air conditioner. The liquid distributor (200) comprises a liquid distributing slot (210) and a liquid stopping slot (220). Multiple liquid distributing through holes (211) are disposed at a bottom wall of the liquid distributing slot (210). A top space of the liquid distributing slot (210) communicates with a vent channel (500) of the falling film evaporator (10). The liquid stopping slot (220) is disposed above the bottom wall of the liquid distributing slot (210). The liquid stopping slot (220) comprises two opposing side walls. The two opposing side walls on the liquid stopping slot (220) are each provided with multiple overflow through holes (221). A top space of the liquid stopping slot (220) communicates with the vent channel (500) of the falling film evaporator (10). A refrigerant can be injected into the liquid stopping slot (220). A gas-liquid mixed refrigerant undergoes primary gas-liquid separation and secondary gas-liquid separation while entering the liquid stopping slot (220) and the liquid distributing slot (210), so as to effectively reduce the amount of gaseous refrigerant mixed in a liquid refrigerant flowing from the bottom wall of the liquid distributing slot (210), thereby ensuring that the liquid refrigerant forms an even and stable liquid film on the surface of a heat exchange tube (310), and improving heat exchange efficiency of the falling film evaporator (10).

Description

Liquid distributor, falling film evaporator and air conditioner

Related applications

This application claims priority from a Chinese patent application filed on July 02, 2018 with an application number of 201810708069.8, entitled "Liquid Distributor, Falling Film Evaporator, and Air Conditioner", which is hereby incorporated by reference in its entirety.

Technical field

The present application relates to the technical field of heat exchange equipment, and in particular, to a liquid distributor, a falling film evaporator, and an air conditioner.

Background technique

During the working process of the falling film evaporator, the refrigerant in the gas-liquid mixed state enters the liquid distributor in the falling film evaporator from the top. The refrigerant is evenly distributed by the liquid distributor and drips onto the heat exchange tube to transfer the cooling capacity to user. After the liquid refrigerant is evaporated, it enters the suction port of the compressor, is compressed, and is discharged into the condenser. The formation of a uniform and stable liquid film covering the surface of the heat exchange tube is a necessary condition to ensure the full heat exchange of the falling film evaporator. The refrigerant in the gas-liquid mixed state in the traditional falling film evaporator is not easy to separate. The liquid refrigerant cannot form a uniform and stable liquid film on the surface of the heat exchange tube under the interference of the gaseous refrigerant. At the same time, the gaseous refrigerant will accelerate the flow of the refrigerant through the surface of the heat exchange tube. Speed greatly reduces the heat transfer efficiency of the falling film evaporator.

Summary of the invention

Based on this, it is necessary to solve the problem of low heat exchange efficiency caused by the difficulty of separating the refrigerant in the gas-liquid mixed state in the conventional falling film evaporator, and provide a liquid distribution capable of effectively separating the refrigerant in the gas-liquid mixed state to improve the heat exchange efficiency. Air conditioner, falling film evaporator, and air conditioner.

A liquid distributor includes:

A liquid homogenizing tank, the bottom wall of the liquid homogenizing tank is provided with a plurality of liquid distribution holes, and the top space of the liquid homogenizing tank is in communication with the exhaust channel of the falling film evaporator;

The liquid-blocking tank is disposed above the bottom wall of the liquid-blocking tank. The liquid-blocking tank includes two opposite side walls. The overflow hole communicates with the top space of the liquid-tight tank and the exhaust passage, and the liquid-tight tank can be filled with refrigerant.

In one embodiment, the liquid distributor further includes a liquid homogenizing tube, the liquid homogenizing tube is disposed in the liquid retaining tank, and a plurality of liquid homogenizing through holes are provided on a wall of the liquid homogenizing tube, The liquid homogenizing pipe can communicate with the refrigerant liquid inlet.

In one embodiment, the liquid distributor further includes an air baffle, and the air baffle cover is provided on the top of the liquid equalizing tank, the liquid blocking tank, and the liquid equalizing tube; The top ends of the liquid equalization tank and the liquid blocking tank are respectively opened, and the top ends of the liquid equalization tank and the liquid blocking tank are respectively spaced from the inner wall of the air baffle; the liquid blocking tank and the The gap between the air baffles, the gap between the liquid equalization tank and the air baffle, and the inner wall of the air baffle form part of an exhaust passage.

In one embodiment, the liquid distributor further includes two end baffles, and the liquid leveling tank, the liquid blocking tank, the liquid leveling tube, and the air baffle have the same horizontal extension direction, The two ends of the liquid leveling tank, the liquid blocking tank, the liquid leveling tube, and the air blocking plate in the horizontal extending direction are respectively opened, and the two end baffles close the liquid leveling tank and Two ends of the liquid retaining groove, the liquid homogenizing pipe, and the air blocking plate in a horizontally extending direction.

In one embodiment, both sides of the air baffle plate in a horizontally extending direction further have side plates, and the bottom end of the side plate is lower than the bottom end of the homogenizing tank.

In one embodiment, the tops of the two side walls of the liquid retaining tank are higher than the center of the liquid homogenizing tube, and the liquid homogenizing through-hole is opened in the wall of the tube below the horizontal level of the liquid homogenizing tube center. .

In one of the embodiments, the inner diameter of the homogeneous through hole is greater than or equal to the inner diameter of the overflow through hole, and the inner diameter of the overflow through hole is greater than or equal to the inner diameter of the liquid distribution through hole.

In one embodiment, the liquid distributor further includes a liquid inlet pipe, and two ends of the liquid inlet pipe communicate with the liquid homogenizing pipe and the refrigerant liquid inlet respectively.

A falling film evaporator includes a casing, a liquid distributor, and a tube heat exchanger. The liquid distributor is the liquid distributor according to any one of the above schemes; and the liquid distributor is disposed in the casing. At the top, the tube heat exchanger is disposed below the liquid distributor; there is an air flow gap between the air baffle and the casing.

In one embodiment, both sides of the air baffle plate in the horizontal extension direction further have side plates, the bottom end of the side plate is lower than the bottom end of the homogenizing tank, and the bottom end of the side plate extends Between the second row of tubes at the bottom of the falling film zone in the tube heat exchanger and the fifth row of tubes at the bottom.

In one embodiment, the falling film evaporator further includes an air outlet pipe, the air outlet pipe is disposed on the top of the housing, and one end of the air outlet pipe is in communication with the interior of the housing. The other end can communicate with the suction circuit of the air-conditioning equipment.

An air conditioner includes an evaporator and a condensing structure connected to each other. The evaporator is a falling film evaporator according to the foregoing solution.

In the liquid distributor, the falling film evaporator, and the air conditioner, the liquid blocking grooves whose overflow flow holes are provided on two opposite side walls can buffer the gas-liquid mixed refrigerant injected into the liquid blocking groove. With the continuous injection of gas-liquid mixed refrigerant, the gas-liquid mixed refrigerant injected into the liquid retaining tank first accumulates at the bottom of the liquid retaining tank. The gaseous refrigerant overflows in the form of bubbles during the injection and accumulation process, and the liquid refrigerant accumulates in the retaining wall. In the liquid tank, the gaseous refrigerant contained in the liquid refrigerant is reduced, and the primary gas-liquid separation of the gas-liquid mixed refrigerant is realized. The gaseous refrigerant that overflowed in a single gas-liquid separation overshoot entered the exhaust channel of the falling film evaporator from the headspace of the liquid retaining tank and was discharged. When the liquid refrigerant containing a small amount of gaseous refrigerant accumulates to the height of the overflow flow hole, the liquid refrigerant flows from the overflow flow hole on the side wall of the liquid blocking tank into the liquid homogenizing tank. The liquid refrigerant was impacted during the flow from the side wall of the liquid retaining tank to the liquid homogenizing tank, and the gaseous refrigerant contained in the liquid refrigerant further overflowed, thereby achieving the secondary gas-liquid separation of the gas-liquid mixed refrigerant. The gaseous refrigerant that overflowed during the secondary gas-liquid separation process was discharged from the head space of the homogenizing tank into the exhaust channel of the falling film evaporator. The liquid blocking tank and the homogenizing tank cooperate to realize the primary gas-liquid separation and the secondary gas-liquid separation, which effectively reduces the inclusion amount of the gaseous refrigerant in the liquid refrigerant flowing from the bottom wall of the homogenizing tank, thereby ensuring the liquid refrigerant in heat exchange. A uniform and stable liquid film is formed on the surface of the tube, and the influence of the gaseous refrigerant on the average speed of the liquid refrigerant flowing through the surface of the heat exchange tube is eliminated, thereby improving the heat exchange efficiency of the falling film evaporator. The overflowing gaseous refrigerant enters the exhaust channel of the falling film evaporator, which reduces the amount of liquid refrigerant liquid beads carried during the discharge of the gaseous refrigerant, thereby reducing the impact of the suction liquid on the air conditioning heat exchange cycle system and ensuring the air conditioning. Normal operation of the system.

BRIEF DESCRIPTION OF THE DRAWINGS

Hereinafter, preferred embodiments of the liquid distributor, the falling film evaporator, and the air conditioner according to the present application will be described with reference to the drawings. In the picture:

FIG. 1 is a schematic diagram of a three-dimensional structure of a liquid distributor provided by an embodiment of the present application; FIG.

FIG. 2 is a schematic diagram of a three-dimensional structure of a homogenizing tank provided by an embodiment of the present application; FIG.

3 is a schematic diagram of a three-dimensional structure of a liquid retaining tank provided by an embodiment of the present application;

FIG. 4 is a schematic diagram of a three-dimensional structure of a homogenizing pipe provided by an embodiment of the present application; FIG.

FIG. 5 is an enlarged structural schematic view of the A-A section in FIG. 4; FIG.

FIG. 6 is a schematic diagram of a three-dimensional structure of a liquid distributor provided by another embodiment of the present application; FIG.

FIG. 7 is a schematic diagram of a three-dimensional structure of a falling film evaporator according to an embodiment of the present application; FIG.

8 is a schematic structural view of a falling film evaporator according to an embodiment of the present application;

FIG. 9 is a schematic cross-sectional structure view taken along B-B in FIG. 8; FIG.

Fig. 10 is a schematic cross-sectional structure taken along the line D-D in Fig. 8.

among them:

10-falling film evaporator

100-shell

200-liquid dispenser

210-Homogeneous tank

211-cloth liquid through hole

220-reservoir

221-Overflow hole

230-homogeneous pipe

231-Homogeneous through hole

240-air baffle

241-side plate

250-end bezel

260-Inlet pipe

300-tube heat exchanger

310-Heat exchange tube

400-outlet

500-exhaust channel

a-Internal diameter of the homogeneous through hole

b-Inner diameter of overflow flow hole

c-Internal diameter of cloth through hole

detailed description

In order to make the purpose, technical solution, and advantages of the present application clearer and clearer, a liquid distributor, a falling film evaporator, and an air conditioner of the present application will be described in further detail in the following through an embodiment and the accompanying drawings.

It should be noted that when an element is referred to as being “fixed to” another element, it may be directly on the other element or there may be a centered element. When an element is considered to be "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. In contrast, when an element is referred to as being "directly on" another element, there are no intervening elements present. The terms "vertical", "horizontal", "left", "right" and similar expressions used herein are for illustrative purposes only. The various objects in the drawings of the embodiments are drawn to a scale convenient for enumeration and not to scale of actual components.

With the development of the air-conditioning industry, the optimization of the structure of the liquid-filled evaporator has stabilized, and each air-conditioning industry has gradually shifted its structural innovation to falling film evaporators. The main factors that affect the heat transfer efficiency of the falling film evaporator are the refrigerant flow rate, liquid distributor structure, heat exchanger tube tube arrangement, and air inlet suction with liquid, etc. Among them, the influence of the liquid distributor is the most important.

Liquid distributors include spray type and drip type. The spray type liquid distributor can ideally spray refrigerant liquid into liquid beads or even smaller droplets and cover the outer surface of the heat exchange tube. The beads are connected and accumulated to form a continuous and uniform liquid film for heat exchange with the heat exchange tubes. However, in practice, it is difficult to control the pressure and flow rate during the spraying process. It is impossible to determine whether the refrigerant is evenly arranged on the surface of the heat exchange tube. After the refrigerant evaporates and vaporizes, it is easy to carry small droplets of the refrigerant, which causes a serious problem of liquid suction. . The drip-type liquid distributor relies on the gravity and viscosity of the refrigerant itself, and forms a column of refrigerant liquid on the heat exchange tube with a porous plate structure to form a uniform and thin liquid film for heat exchange with the heat exchange tube. Since the refrigerant enters the evaporator as a gas-liquid two-phase mixture, the gas flow velocity affects the average flow velocity of the two-phase refrigerant, and greatly affects the state of the internal liquid refrigerant, thereby affecting the liquid distribution effect.

The liquid distributor structure directly affects the refrigerant liquid distribution and film formation quality of the falling film evaporator, and the uniformity of the refrigerant liquid film directly affects the heat transfer efficiency. Therefore, optimizing the structure of the liquid distributor is an effective means to improve the performance of the falling film evaporator. For drip-type liquid distributors, the separation of the refrigerant gas and liquid entering the liquid distributor has become the focus of most air-conditioning industries.

As shown in FIGS. 1-3 and 10, the present application provides a liquid distributor 200 including a liquid equalizing tank 210 and a liquid blocking tank 220. The bottom wall of the homogenization tank 210 is provided with a plurality of liquid distribution holes 211, which means that the bottom wall of the homogenization tank 210 is a perforated plate. The top space of the homogenizing tank 210 is in communication with the exhaust passage 500 of the falling film evaporator 10, and the exhaust passage 500 is shown by an arrow in FIG. 10. The liquid blocking tank 220 is disposed in the liquid equalizing tank 210. The bottom wall of the liquid blocking tank 220 is spaced from the bottom wall of the liquid equalizing tank 210. The liquid blocking tank 220 includes two opposite side walls, and the opposite sides of the liquid blocking tank 220 are opposite. The wall is respectively provided with a plurality of overflow flow holes 221, the top space of the liquid blocking tank 220 is in communication with the exhaust passage 500 of the falling film evaporator 10, and the refrigerant can be injected into the liquid blocking tank 220.

In the liquid distributor 200, the liquid blocking grooves 220 provided on the two opposite side walls of the overflow flow holes 221 can buffer the gas-liquid mixed refrigerant injected into the liquid blocking grooves 220. With the continuous injection of gas-liquid mixed refrigerant, the gas-liquid mixed refrigerant injected into the liquid retaining tank 220 first accumulates at the bottom of the liquid retaining tank 220. The gaseous refrigerant overflows in the form of bubbles during the injection and accumulation process, and the liquid refrigerant accumulates. In the liquid blocking tank 220, the gaseous refrigerant contained in the liquid refrigerant is reduced, and a primary gas-liquid separation of the gas-liquid mixed refrigerant is achieved. The gaseous refrigerant that has overflowed in the primary gas-liquid separation overshoot enters the exhaust passage 500 of the falling film evaporator 10 from the head space of the liquid retaining tank 220 and is discharged. When the liquid refrigerant containing a small amount of gaseous refrigerant accumulates to the height of the overflow flow hole 221, the liquid refrigerant flows into the liquid equalization tank 210 from the overflow flow hole 221 on the side wall of the liquid blocking tank 220. The liquid refrigerant is impacted during the flow from the side wall of the liquid blocking tank 220 to the liquid homogenizing tank 210, and the gaseous refrigerant contained in the liquid refrigerant further overflows, thereby realizing the secondary gas-liquid separation of the gas-liquid mixed refrigerant. The gaseous refrigerant that has overflowed during the secondary gas-liquid separation process enters the exhaust passage 500 of the falling film evaporator 10 from the head space of the homogenizing tank 210 and is discharged.

The above-mentioned liquid blocking tank 220 cooperates with the homogenizing tank 210 to realize the primary gas-liquid separation and the secondary gas-liquid separation, which effectively reduces the inclusion amount of the gaseous refrigerant in the liquid refrigerant flowing from the bottom wall of the homogenizing tank 210, thereby ensuring the liquid refrigerant. A uniform and stable liquid film is formed on the surface of the heat exchange tube 310, and the influence of the gaseous refrigerant on the average speed of the liquid refrigerant flowing through the surface of the heat exchange tube 310 is eliminated, and the heat exchange efficiency of the falling film evaporator 10 is improved. The overflowing gaseous refrigerant enters the exhaust channel 500 of the falling film evaporator 10, which reduces the amount of liquid refrigerant liquid beads carried during the discharge of the gaseous refrigerant, thereby reducing the impact of the suction liquid on the air-conditioning heat exchange cycle system, ensuring that The normal operation of the air conditioning system.

As shown in FIG. 1 and FIG. 4, in an embodiment of the present application, the liquid distributor 200 further includes a liquid equalizing tube 230, which is disposed in the liquid retaining tank 220, and a wall of the liquid equalizing tube 230 is provided. The plurality of equalizing through holes 231 and the equalizing pipe 230 can communicate with the refrigerant liquid inlet of the falling film evaporator 10. The liquid homogenizing tube 230 can distribute the gas-liquid mixed refrigerant injected into the liquid homogenizing tube 230 along its own extension direction. After the gas-liquid mixed refrigerant enters the homogenizing pipe 230, the homogeneous through-hole 231 opened in the pipe wall of the homogenizing pipe 230 flows out into the liquid retaining tank 220. The gas-liquid mixed refrigerant is impacted during the flow from the pipe wall of the liquid equalizing pipe 230 to the liquid retaining tank 220, and the gaseous refrigerant overflows. This process is an implementation method of the gas-liquid mixed refrigerant once the gas-liquid separation. Optionally, the bottom of the liquid equalizing tube 230 and the bottom wall of the liquid blocking tank 220 are abutted or spaced from each other. In this embodiment, the space between the bottom of the liquid equalizing pipe 230 and the bottom wall of the liquid retaining tank 220 is set, which can increase the path length and impact degree of the gas-liquid mixed refrigerant flowing to the liquid retaining tank 220, so as to facilitate more Gaseous refrigerant overflowed. The overflowing gaseous refrigerant enters the exhaust passage 500 of the falling film evaporator 10 from the head space of the liquid retaining tank 220 and is discharged.

Further, as shown in FIGS. 4 and 5, the top end of the liquid blocking tank 220 is an opening, and the liquid equalizing tube 230 is a circular tube. The tops of the two side walls of the liquid blocking tank 220 are higher than the center of the liquid equalizing pipe 230, and the liquid equalizing through hole 231 is opened in the tube wall of the part below the horizontal level of the liquid equalizing pipe 230. Even under a large pressure, the liquid refrigerant is The spraying direction of the liquid equalization through hole 231 of the liquid pipe 230 is only vertical downward spraying, oblique downward spraying, or horizontal spraying, which can effectively prevent the liquid refrigerant from splashing into the liquid retaining tank 220 when it flows out of the liquid equalizing pipe 230. Outside the area. As a practicable way, in the cross section of the homogenizing tube 230, between the line connecting the center of the topmost homogeneous through hole 231 and the cross section center of the homogenizing tube 230 and the vertical line passing through the cross section center of the homogenizing tube 230 The included angle is less than or equal to 90 °. In this embodiment, as shown in FIG. 5, seven rows of equalizing through holes 231 are provided along the circumferential direction of the cross section of the equalizing pipe 230, and each row of the equalizing through holes 231 are respectively arrayed along the extending direction of the equalizing pipe 230. The angle between the line between the center of the topmost homogeneous through-hole 231 and the center of the cross section of the liquid equalizing tube 230 and the vertical line passing through the center of the cross section of the homogenized tube 230 is equal to 90 °, which means that the The center is located on the horizontal plane of the center of the homogenizing pipe 230.

In an embodiment of the present application, as shown in FIG. 6-8, the liquid distributor 200 further includes a liquid inlet pipe 260. The two ends of the liquid inlet pipe 260 communicate with the liquid inlet pipe 230 and the refrigerant inlet of the falling film evaporator 10 respectively. The liquid equalizing pipe 230 can communicate with the refrigerant liquid inlet of the falling film evaporator 10 through the liquid inlet pipe 260. Optionally, the liquid inlet pipe 260 and the liquid equalizing pipe 230 are a detachable fixed connection or a non-detachable fixed connection. As an implementable manner, a liquid inlet through hole adapted to the liquid inlet tube 260 is opened at the top of the tube wall of the liquid homogenization tube 230, and one end of the liquid inlet tube 260 is inserted into the liquid inlet through hole at the top of the tube wall of the liquid homogenization tube 230. , And the liquid inlet pipe 260 and the liquid homogenizing pipe 230 are connected and sealed by welding. As an implementable manner, the top end of the pipe wall of the homogenizing tube 230 is provided with an internally threaded through hole adapted to the liquid inlet pipe 260, and one end of the liquid inlet pipe 260 having an external thread is screwed into the top of the pipe wall of the homogenizing tube 230. The internally threaded through-hole, the liquid inlet pipe 260 and the liquid equalizing pipe 230 are connected in a threaded manner and sealed.

In an embodiment of the present application, as shown in FIG. 6 and FIG. 10, the liquid distributor 200 further includes an air baffle 240. The bottom end of the air baffle 240 is an opening, and the air baffle 240 is disposed in the liquid equalizing tank 210, The top of the liquid blocking tank 220 and the liquid equalizing tube 230. The top ends of the liquid equalizing tank 210 and the liquid blocking tank 220 are respectively opened, and the top ends of the liquid equalizing tank 210 and the liquid blocking tank 220 are respectively spaced from the inner wall of the air baffle 240. The gap between the liquid blocking tank 220 and the air blocking plate 240, the gap between the liquid equalizing tank 210 and the gas blocking plate 240, and the inner wall of the gas blocking plate 240 form a part of the exhaust passage 500 in the falling film evaporator 10. The air baffle 240 can guide the gaseous refrigerant overflowing during the primary gas-liquid separation and the secondary gas-liquid separation to flow and be discharged according to the exhaust passage 500. The overflowing gaseous refrigerant enters the exhaust channel 500 of the falling film evaporator 10, which reduces the amount of liquid refrigerant liquid beads carried during the discharge of the gaseous refrigerant, thereby reducing the impact of the suction liquid on the air-conditioning heat exchange cycle system, ensuring that The normal operation of the air conditioning system.

Optionally, the liquid leveling tank 210, the liquid blocking tank 220, the liquid leveling tube 230, and the air baffle 240 are supported and connected through a common support structure, or the above-mentioned relative positional relationships are respectively achieved through separate support structures. In an embodiment of the present application, as shown in FIGS. 1, 9 and 10, the liquid distributor 200 further includes two end baffles 250, a liquid equalizing tank 210, a liquid blocking tank 220, a liquid equalizing tube 230, and an air baffle. 240 has the same horizontal extension direction, and the two ends of the liquid equalizing tank 210, the liquid blocking tank 220, the liquid equalizing tube 230, and the air baffle 240 in the horizontal extending direction are respectively opened, and the two shielding plates respectively close the liquid equalizing tank 210 and the liquid blocking wall. Both ends of the liquid tank 220, the liquid equalizing pipe 230, and the air baffle 240 in the horizontally extending direction. The end baffle 250 can play a role of fixed support and closing both ends of the liquid extending tank 210, the liquid blocking tank 220, and the liquid equalizing pipe 230 in the horizontal extending direction at the same time. Further, the end baffle 250 closes both ends of the liquid equalizing tank 210, the liquid blocking tank 220, the liquid equalizing tube 230, and the air blocking plate 240 in the horizontal extending direction in a full-welding manner.

In the above embodiment, the liquid equalizing tank 210 and the liquid blocking tank 220 are stamped structural parts. The plate of the set size is bent to obtain the liquid equalizing tank 210 or the barrier that is open at both ends in the horizontally extending direction and has sidewalls on both sides.液槽 220。 Liquid tank 220. The liquid distribution through holes 211 arranged in an array are punched out from the bottom wall of the liquid equalization tank 210, and the overflow flow holes 221 arranged in an array are punched out at both side walls of the liquid blocking tank 220. On the basis of the original pipe material, a liquid inlet through hole at the top and a liquid through hole 231 in the lower portion are punched out to obtain the liquid through tube 230 in this embodiment. The liquid inlet pipe 260 is an ordinary round pipe. When the liquid inlet pipe 260 and the liquid equalizing pipe 230 are connected and sealed by a thread connection, an external thread is machined at one end of the liquid inlet pipe 260 and an inner wall of the liquid inlet through hole is processed. A suitable internal thread is sufficient.

In an embodiment of the present application, as shown in FIG. 6 and FIG. 10, both sides of the air blocking plate 240 along the horizontal extending direction further have a side plate 241, and the bottom end of the side plate 241 is lower than the bottom end of the homogenizing tank 210. The bottom end of the side plate 241 extends between the second row of tubes at the bottom of the falling film zone to the fifth row of tubes at the bottom of the tube heat exchanger 300, where "the second row of tubes at the bottom of the falling zone to the fifth row of tubes at the bottom" refers to It is "the second row to the fifth row from the bottom of the falling film zone." The side plate 241 can increase the length of the exhaust passage 500 to a certain extent, which facilitates separation of the gaseous refrigerant carrying a small amount of liquid refrigerant liquid beads from the liquid refrigerant liquid beads, and further reduces the amount of liquid refrigerant liquid beads carried during the discharge of the gaseous refrigerant.

In an embodiment of the present application, as shown in FIG. 3-5, the inner diameter a of the liquid equalization through hole 231 is greater than or equal to the inner diameter b of the overflow through hole 221, and the inner diameter b of the overflow through hole 221 is greater than or equal to the inner diameter of the liquid distribution through hole 211. c, that is, a≥b≥c. The diameters of the liquid distribution through holes 211, the overflow flow holes 221, and the liquid equalization through holes 231 are sequentially reduced. The liquid refrigerant is distributed after being blocked and buffered multiple times to ensure that the liquid refrigerant flow rate drops smoothly.

The present application also provides a falling film evaporator 10, as shown in FIGS. 7-10. The falling film evaporator 10 includes a casing 100, a liquid distributor 200, and a tube heat exchanger 300. The liquid distributor 200 is any of the above schemes. Item one of the liquid distributor 200. The liquid distributor 200 is disposed on the top end of the casing 100, and the tube heat exchanger 300 is disposed on the bottom of the liquid distributor 200. There is an air flow gap between the air baffle 240 and the casing 100. The air gap between the air baffle 240 and the casing 100 forms a part of the exhaust passage 500 in the falling film evaporator 10. The gaseous refrigerant overflowing after the gas-liquid separation moves downward along the inner wall of the air baffle plate 240 to the bottom end of the side plate 241, and then is discharged along the air gap between the outer wall of the air baffle plate 240 and the casing 100. Further, the falling film evaporator 10 further includes an air outlet pipe 400 provided at the top of the casing 100. One end of the air outlet pipe 400 is in communication with the interior of the casing 100, and the other end of the air outlet pipe 400 can be connected to the air-intake circuit of the air conditioner. Connected. The gaseous refrigerant can enter the air outlet pipe 400 along the air gap between the air baffle 240 and the housing 100 and finally enter the air-intake circuit. The gaseous refrigerant formed by evaporation of the liquid refrigerant in the falling film evaporator 10 and the tube heat exchanger 300 after heat exchange is also discharged along the exhaust passage 500. The existence of the air baffle 240 increases the length of the gaseous refrigerant discharge path, effectively reduces the amount of liquid refrigerant liquid beads carried in the gaseous refrigerant, and further reduces the influence of the air-intake liquid on the air-conditioning heat exchange cycle system, ensuring the air-conditioning system. Normal operation.

The present application also provides an air conditioner, which includes an evaporator and a condensing structure that are interconnected, and the evaporator is the falling film evaporator 10 in the above solution.

The liquid distributor 200 is a drip-type liquid distributor. When the gas-liquid mixed refrigerant enters, the gas-liquid separation is performed first, and then the liquid refrigerant is used for liquid distribution to reduce the average flow rate of the refrigerant, and it is easier to form a liquid column flow form. The flow or wave laminar flow contacts the outer wall surface of the heat exchange tube 310, and then spreads along the circle of the heat exchange tube 310 to spread the liquid evenly, reducing the area on the heat exchange tube 310 that is not covered by the liquid film. The gaseous refrigerant and the liquid refrigerant are separated into different channels, which prevents the gaseous refrigerant from interfering with the distribution of the liquid refrigerant and ensures the integrity and continuity of the refrigerant liquid column. At the same time, the exhaust passage 500 communicates with the interior of the housing 100 and the interior of the liquid distributor 200. The exhaust channel 500 can balance the internal pressure of the liquid distributor 200 and the internal pressure of the casing 100. The liquid refrigerant only distributes liquid by its own gravity, and finally achieves a more uniform liquid distribution effect.

In the liquid distributor 200 described above, there are two types of gas-liquid mixed refrigerant flows. The first case: when the gas-liquid mixed refrigerant enters the liquid inlet pipe 260, the flow rate is low. After flowing to the liquid equalizing pipe 230, the liquid phase refrigerant is axially distributed and settles at the bottom of the liquid equalizing pipe 230 under the action of gravity. The liquid equalizing pipe 230 The liquid homogeneous through hole 231 on the pipe wall is not completely covered by the liquid refrigerant; the gaseous refrigerant flows out of the liquid homogeneous through hole 231 that is not covered and rises, and the liquid refrigerant flows from the liquid homogeneous through hole 231 covered by the liquid refrigerant at the bottom of the liquid homogenizer 230 Outflow, gas-liquid mixed refrigerant realizes the first gas-liquid separation. The second case: when the gas-liquid mixed refrigerant enters the liquid inlet pipe 260, the flow velocity is high. After flowing to the liquid equalizing pipe 230, all the liquid equalizing through holes 231 are covered. The pressure in the liquid equalizing pipe 230 increases, and the liquid refrigerant passes from the liquid homogeneous through The hole 231 is pressed out; the liquid refrigerant carries the gaseous refrigerant to the liquid retaining tank 220. The liquid refrigerant inflow in the liquid retaining tank 220 is greater than the outflow. The liquid refrigerant continues to accumulate until the inflow and outflow reach a balance. At this time, the accumulated liquid refrigerant is submerged. The lower half of the liquid equalizing pipe 230; when the gas-liquid mixed refrigerant flows into the liquid retaining tank 220, the gaseous refrigerant overflows in the form of bubbling, the liquid refrigerant flows into the liquid equalizing tank 210, and the gaseous refrigerant rises in the form of bubbles. Secondary gas-liquid separation. In an actual working condition, by controlling the arrangement of the overflow hole 221 on the side wall of the liquid blocking tank 220, the above-mentioned two situations may exist at the same time.

The technical features of the embodiments described above can be arbitrarily combined. In order to simplify the description, all possible combinations of the technical features in the above embodiments have not been described. However, as long as there is no contradiction in the combination of these technical features, It should be considered as the scope described in this specification.

The above-mentioned embodiments only express several implementation manners of the present application, and the description thereof is more specific and detailed, but cannot be understood as a limitation on the scope of the invention patent. It should be noted that, for those of ordinary skill in the art, without departing from the concept of the present application, several modifications and improvements can be made, and these all belong to the protection scope of the present application. Therefore, the protection scope of this application patent shall be subject to the appended claims.

Claims

A liquid distributor includes:

A liquid homogenizing tank (210), the bottom wall of which is provided with a plurality of liquid distribution holes (211), and a top space of the liquid homogenizing tank (210) communicates with an exhaust channel (500);

A liquid-blocking tank (220) is disposed above a bottom wall of the liquid-blocking tank (210), and the liquid-blocking tank (220) includes two opposite side walls, and the liquid-blocking tank (220) A plurality of overflow flow holes (221) are respectively provided on two opposite sidewalls of the upper side), and the top space of the liquid retaining groove (220) is communicated with the exhaust passage (500), and the liquid retaining groove (220) can be injected into the liquid retaining groove (220). Refrigerant.
The liquid distributor according to claim 1, wherein the liquid distributor (200) further comprises a liquid equalizing pipe (230), and the liquid equalizing pipe (230) is disposed in the liquid retaining tank (220). Inside, a plurality of liquid-equalizing through-holes (231) are provided on a wall of the liquid-equalizing tube (230), and the liquid-equalizing tube (230) can communicate with a refrigerant liquid inlet.
The liquid distributor according to claim 2, characterized in that the liquid distributor (200) further comprises an air baffle plate (240), and the air baffle plate (240) covers the liquid homogenizer The tops of the tank (210), the liquid blocking tank (220), and the liquid equalizing tube (230); the top ends of the liquid equalizing tank (210) and the liquid blocking tank (220) are respectively opened, and The top end of the homogenizing tank (210) and the top end of the liquid retaining tank (220) are respectively spaced from the inner wall of the air baffle (240); the liquid retaining tank (220) and the air baffle ( The gap between 240), the gap between the liquid equalizing tank (210) and the air baffle (240), and the inner wall of the air baffle (240) form a part of the exhaust passage (500).
The liquid distributor according to claim 3, wherein the liquid distributor (200) further comprises two end baffles (250), the liquid homogenizing tank (210), and the liquid blocking tank (220). ), The liquid equalizing pipe (230) and the air baffle (240) have the same horizontal extension direction, and the liquid equalizing tank (210), the liquid blocking tank (220), and the liquid equalizing pipe ( 230) and two ends of the air baffle plate (240) in the horizontal extension direction are respectively opened, and the two end baffles respectively close the liquid homogenizing tank (210), the liquid baffle tank (220), and The two ends of the liquid equalizing pipe (230) and the air blocking plate (240) in the horizontal extending direction.
The liquid distributor according to claim 3, characterized in that, both sides of the air blocking plate (240) in the horizontal extending direction further have a side plate (241), and a bottom end of the side plate (241) is lower than The bottom end of the homogenizing tank (210).
The liquid distributor according to any one of claims 2 to 5, characterized in that the top ends of both side walls of the liquid blocking groove (220) of the liquid blocking groove are higher than the center of the liquid equalizing pipe (230). The homogenizing through-hole (231) is opened in a pipe wall of a portion below the center horizontal plane of the homogenizing pipe (230).
The liquid distributor according to any one of claims 2 to 5, characterized in that the inner diameter of the liquid equalization through hole (231) is greater than or equal to the inner diameter of the overflow flow hole (221), and the overflow flow hole (221) The inner diameter of is greater than or equal to the inner diameter of the liquid distribution hole (211).
The liquid distributor according to any one of claims 2-5, wherein the liquid distributor (200) further comprises a liquid inlet pipe (260), and two ends of the liquid inlet pipe (260) communicate with each other The liquid equalizing pipe (230) and the refrigerant liquid inlet.
A falling film evaporator, comprising a casing (100), a liquid distributor (200), and a tube heat exchanger (300), wherein the liquid distributor (200) is any one of claims 3-5 The liquid distributor (200) according to the item; the liquid distributor (200) is disposed on the top end in the casing (100), and the tube heat exchanger (300) is disposed on the liquid distributor (200). 200); there is an airflow gap between the air baffle (240) and the casing (100).
The falling film evaporator according to claim 9, characterized in that both sides of the air blocking plate (240) in the horizontal extension direction further have side plates (241), and the bottom ends of the side plates (241) are low At the bottom end of the homogenizing tank (210), the bottom end of the side plate (241) extends to the bottom second row of tubes to the bottom fifth row of tubes in the tube heat exchanger (300). between.
The falling film evaporator according to claim 9, characterized in that the falling film evaporator (10) further comprises an air outlet pipe (400), and the air outlet pipe (400) is provided in the casing (100). At the top, one end of the air outlet pipe (400) is in communication with the inside of the casing (100), and the other end of the air outlet pipe (400) can be in communication with the air-intake circuit of the air conditioning equipment.
An air conditioner, characterized in that it comprises an evaporator and a condensing structure in communication with each other, and the evaporator is a falling film evaporator (10) according to any one of claims 9-11.