CN112944736A - Heat exchanger assembly, falling film heat exchanger and heat pump unit - Google Patents

Abstract

The application provides a heat exchanger subassembly, falling liquid film heat exchanger and heat pump set. The heat exchanger component comprises a shell, wherein a heat exchange area and a liquid blocking piece are arranged in the shell, and the liquid blocking piece is arranged on the side edge of the heat exchange area; the liquid blocking piece is provided with a mesh structure through which gas can pass and liquid is trapped. Set up in the side in heat transfer region and keep off liquid spare, be equipped with gaseous passing and liquid is detained's mesh structure in this fender liquid spare for when the heat exchanger subassembly was being used as the condenser, gaseous directly passes and keeps off liquid spare and get into the heat transfer region, carries out heat exchange process on a large scale, has improved heat exchange efficiency relatively.

Description

Heat exchanger assembly, falling film heat exchanger and heat pump unit

Technical Field

The application belongs to the technical field of heat pump units, and particularly relates to a heat exchanger assembly, a falling film heat exchanger and a heat pump unit.

Background

In the heat exchanger type for commercial large-scale water chilling units, the falling film heat exchanger is favored in the evaporation working condition due to the advantages of high heat exchange efficiency, small filling amount, convenient maintenance and the like. The falling film heat exchanger is mainly characterized in that liquid refrigerants are uniformly distributed on the surface of a heat exchange tube through a top liquid distributor as shown in figures 1 and 2, and liquid outlets of the liquid distributor 3 have certain pressure, so that liquid baffles 4 are required to be arranged on two sides of a tube distribution area of the heat exchange tube to prevent liquid drops from splashing to enter an air suction port in a spraying process to cause air suction and liquid carrying of a unit.

However, when the falling film heat exchanger is used for a heat pump unit, namely the heat exchanger is switched to a condensation function, the gaseous refrigerant entering from the top air inlet can be separated and blocked by the liquid blocking plate, so that the heat exchange tube and the gaseous refrigerant can not be in repeated contact, and the condensation effect is insufficient.

Disclosure of Invention

Therefore, the technical problem that this application will be solved lies in providing a heat exchanger subassembly, falling liquid film heat exchanger and heat pump set, can promote the heat transfer area of gas and heat exchange tube under the condensation operating mode.

In order to solve the above problems, the present application provides a heat exchanger assembly, including a housing, where the housing includes a heat exchange region and a liquid blocking member, and the liquid blocking member is disposed at a side of the heat exchange region; the liquid blocking piece is provided with a through hole structure through which gas can pass and liquid is retained.

Preferably, the shell is internally provided with a liquid distribution cavity arranged above the heat exchange area, and one end of the liquid baffle is connected to the side wall of the liquid distribution cavity.

Preferably, the other end of the liquid barrier extends downwards along the heat exchange region.

Preferably, the extending end of the liquid blocking member abuts against the inner wall of the housing.

Preferably, a preset gap is formed between the extending end of the liquid blocking piece and the inner wall of the shell.

Preferably, the other end of the liquid blocking member extends in a direction away from the heat exchange region.

Preferably, the other end of the liquid blocking member extends to the inner wall of the housing.

Preferably, the liquid barrier comprises a separating mesh.

According to another aspect of the present application, there is provided a falling film heat exchanger comprising a heat exchanger assembly as described above.

According to a further aspect of the present application, there is provided a heat pump unit comprising a heat exchanger assembly as described above or a falling film heat exchanger as described above.

The heat exchanger assembly comprises a shell, wherein a heat exchange area and a liquid blocking piece are arranged in the shell, and the liquid blocking piece is arranged on the side edge of the heat exchange area; the liquid blocking piece is provided with a through hole structure through which gas can pass and liquid is retained. Set up in the side in heat transfer region and keep off liquid spare, be equipped with gaseous passing and liquid is detained's through-hole structure in this fender liquid spare for when the heat exchanger subassembly was being used as the condenser, gaseous directly passed and keep off liquid spare and get into the heat transfer region, promote gaseous and heat transfer area in heat transfer region, improved heat exchange efficiency relatively.

Drawings

Figure 1 is a block diagram of a prior art falling film heat exchanger;

FIG. 2 is a gas flow diagram of a prior falling film heat exchanger under a condensation condition;

fig. 3 is a structural view of a falling film heat exchanger according to an embodiment of the present application;

FIG. 4 is a gas flow diagram of the falling film heat exchanger according to the embodiment of the present application under a condensing condition;

fig. 5 is another schematic structural view of a falling film heat exchanger according to an embodiment of the present application;

fig. 6 is a schematic view of another structure of a falling film heat exchanger according to an embodiment of the present application.

The reference numerals are represented as:

1. a housing; 11. a feed inlet; 12. a gas port; 13. a liquid discharge port; 2. a heat exchange area; 3. a liquid distributor; 4. a liquid baffle; 5. a gas phase flow dead zone; 6. a separation net; 61. and presetting holes.

Detailed Description

With combined reference to fig. 3 to 6, according to an embodiment of the present application, a heat exchanger assembly includes a housing 1, a heat exchange area 2 and a liquid blocking member are included in the housing 1, and the liquid blocking member is disposed at a side of the heat exchange area 2; the liquid blocking piece is provided with a through hole structure through which gas can pass and liquid is retained.

The liquid blocking piece is arranged on the side edge of the heat exchange area 2, different from a liquid blocking plate 4 in a traditional structure, a through hole structure through which gas can pass and liquid is retained is arranged in the liquid blocking piece, and therefore the gas can pass through the liquid blocking piece when entering or exiting the heat exchange area 2; especially when this heat exchanger subassembly uses as the condensation subassembly, gaseous directly passes and keeps off liquid spare and get into heat transfer area 2, need not to walk around liquid baffle 4 and just can carry out the heat exchange with partial heat transfer area 2 as gas in traditional structure, consequently relatively speaking, reduced keeping off blockking of liquid baffle 4, can take place the heat exchange with heat transfer area 2 large tracts of land more, improved heat transfer area 2's utilization ratio greatly to and heat exchange efficiency when promoting the condensation operating mode.

In some embodiments, the shell 1 includes a liquid distribution cavity arranged above the heat exchange area 2, one end of the liquid blocking piece is connected to the side wall of the liquid distribution cavity, and the liquid distribution cavity is arranged in the shell 1, so that the heat exchanger assembly can be used as an evaporator, after heat exchange occurs in the heat exchange area 2, liquid is changed into gas through phase change, at the moment, the gas possibly contains liquid, and when the heat exchanger assembly passes through a mesh structure of the liquid blocking piece, the liquid contained in the gas is blocked, which is equivalent to gas-liquid separation.

In order to improve the gas-liquid separation effect, the through hole structure can be designed into a multi-zigzag structure, which is equivalent to increase the gas flow path and the collision probability until small liquid drops contained in the gas are absorbed in the liquid blocking piece.

For the connection between the liquid blocking member and the liquid distribution cavity, the connection can be a sealed connection in order to ensure that the gas can only pass through the liquid blocking member as much as possible.

In some embodiments, the other end of the liquid barrier extends downwards along the heat exchange area 2, and in the arrangement position and the extension structure, the liquid barrier is similar to the traditional liquid barrier 4, but because the liquid barrier is provided with the through holes, the liquid can be prevented from flowing out of the heat exchange area 2, and the gas flow path is shortened.

In some embodiments, the extending end of the liquid blocking member abuts against the inner wall of the casing 1, and the liquid blocking member extends to the inner wall of the casing 1 at the bottom of the heat exchange area 2, so that the gas after heat exchange can only pass through the liquid blocking member, and liquid drops in the gas are ensured to be intercepted. Also can establish to be equipped with between the extension end of keeping off liquid spare and the 1 inner wall of casing and predetermine the clearance, effectively reduce the inside pressure loss of heat exchanger or reduction in production cost, this minimum requirement in predetermineeing the clearance: the upper end of the predetermined gap is lower than the central plane of the housing 1.

In some embodiments, the other end of the liquid blocking member extends in a direction away from the heat exchange area 2, so that the liquid blocking member can be reduced, and the cost can be reduced. Preferably, the other end of the liquid barrier extends to the inner wall of the housing 1.

In some embodiments, the liquid blocking member comprises a separation net 6, and a net structure is adopted, so that the ventilation performance is good, and the gas phase flow dead zone 5 can be better eliminated. Or a ventilating plate made of porous material can also be adopted.

According to an embodiment of the application, a falling film heat exchanger comprises a heat exchanger assembly as described above.

As shown in fig. 1 and 2, when the heat pump unit is switched to a condensation condition in the conventional falling film heat exchanger of the heat pump working condition, the top of the heat exchanger is blocked by the liquid baffles 4 arranged on the two sides of the evaporation working condition, so that the upper half part of the heat exchange tube region cannot be fully contacted with the gaseous refrigerant, a gas phase flow dead zone 5 is formed, and the condensation effect is abnormal.

In the embodiment of this application, originally for the fender liquid board 4 of entity structure with the both sides of heat transfer region 2, change to the separation net 6 that has vapor-liquid separation function, this separation net 6 is woven by the wire and is formed, and the gaseous refrigerant of smuggleing secretly the liquid drop passes through this net, and gas is direct to pass this net, and the liquid of smuggleing secretly is filtered down to eliminate the not good gaseous phase flow blind spot 5 of condensation effect, its concrete implementation is as follows:

1. under the evaporation working condition, materials are fed into the liquid distributor 3 through the feed inlet 11, gaseous refrigerants generated in the materials or by heat exchange possibly contain liquid-phase refrigerants, the liquid-phase refrigerants are directly blocked by the separation net 6 when flowing through the separation net 6, and the gaseous refrigerants directly pass through the separation net 6 and enter the evaporator air outlet 12.

2. Under the condensation working condition, the gaseous refrigerant enters the heat exchanger and directly penetrates through the separation net 6, exchanges heat with the internal heat exchange tube, is condensed, and then is led out of the shell 1 through the liquid outlet 13.

3. The section of the separation net 6 is generally arranged in an L shape, the short edge of the filter net extends to the edge of the liquid distributor 3, the long edge of the filter net is downward to be contacted with the shell 1 along the edge of the supporting plate, and the extension length of the filter net can be reduced properly according to the vapor-liquid filtering effect;

4. in order to ensure the vapor-liquid separation effect, on the cross section of the heat exchanger, a closed heat exchange area 2 is formed by the separation nets 6 arranged on the left side and the right side of the heat exchange tube, the bottom surface of the liquid distributor 3 and the shell 1 so as to eliminate dispersed small liquid drops splashed inside;

5. the pressure loss in the heat exchanger can be effectively reduced or the production cost can be reduced, the preset holes 61 can be reserved between the lower part of the separation net 6 and the shell 1, but the lowest area of the separation net 6 is required to be below the central surface of the shell 1; the joint of the separation net 6 at the top and the liquid distributor 3 must be sealed to prevent the escaping liquid from the gap from being directly sucked into the air outlet 12 under the evaporation working condition; meanwhile, one side of the separation net 6 is inclined to the side with smaller flow area formed by the shell 1, so that the surface of the vapor-liquid separation net 6 is reduced, and the cost is reduced.

6. The separation net 6 is arranged along the axial direction of the shell 1, and the length of the separation net is not less than the length of the liquid distributor 3; so as to ensure that the separation net 6 fully covers the heat exchange area 2; meanwhile, the length of the tube plate does not exceed the distance between the inner sides of the tube plates at two sides, so that assembly interference is prevented.

According to an embodiment of the application, a heat pump unit comprises a heat exchanger assembly as described above or a falling film heat exchanger as described above.

It is easily understood by those skilled in the art that the above embodiments can be freely combined and superimposed without conflict.

The above description is only exemplary of the present application and should not be taken as limiting the present application, as any modification, equivalent replacement, or improvement made within the spirit and principle of the present application should be included in the protection scope of the present application. The foregoing is only a preferred embodiment of the present application, and it should be noted that, for those skilled in the art, several modifications and variations can be made without departing from the technical principle of the present application, and these modifications and variations should also be considered as the protection scope of the present application.

Claims (10)

1. A heat exchanger component is characterized by comprising a shell (1), wherein a heat exchange area (2) and a liquid blocking piece are arranged in the shell (1), and the liquid blocking piece is arranged on the side edge of the heat exchange area (2); the liquid blocking piece is provided with a through hole structure through which gas can pass and liquid is retained.

2. The heat exchanger assembly according to claim 1, characterized in that the housing (1) comprises a liquid distribution cavity therein above the heat exchange area (2), and one end of the liquid blocking member is connected to a side wall of the liquid distribution cavity.

3. A heat exchanger assembly according to claim 2, wherein the other end of the liquid barrier extends downwards along the heat exchange area (2).

4. A heat exchanger assembly according to claim 3, wherein the extended end of the liquid barrier abuts against the inner wall of the housing (1).

5. A heat exchanger assembly according to claim 3, characterized in that a predetermined clearance is provided between the extended end of the liquid stop and the inner wall of the housing (1).

6. A heat exchanger assembly according to claim 2, wherein the other end of the liquid barrier extends in a direction away from the heat exchanging region (2).

7. The heat exchanger assembly according to claim 6, characterized in that the other end of the liquid barrier extends to the inner wall of the housing (1).

8. Heat exchanger assembly according to any of claims 1-7, wherein the liquid barrier comprises a separation mesh (6).

9. A falling film heat exchanger, comprising a heat exchanger assembly according to any one of claims 1 to 8.

10. A heat pump unit comprising a heat exchanger assembly according to any one of claims 1 to 8 or a falling film heat exchanger according to claim 9.

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