CN220083809U

CN220083809U - Fin heat exchanger

Info

Publication number: CN220083809U
Application number: CN202320746360.0U
Authority: CN
Inventors: 孙清华; 金瓯; 顾海华
Original assignee: Schlee Nanjing Refrigeration Machinery Manufacturing Co ltd
Current assignee: Schlee Nanjing Refrigeration Machinery Manufacturing Co ltd
Priority date: 2023-04-07
Filing date: 2023-04-07
Publication date: 2023-11-24
Anticipated expiration: 2033-04-07

Abstract

The utility model discloses a fin heat exchanger, which comprises a liquid distribution head assembly communicated with a refrigerant inlet and a plurality of heat exchange tubes, wherein the heat exchange tubes comprise inlet heat exchange tubes, stroke heat exchange tubes and outlet heat exchange tubes, a plurality of liquid outlet passages are arranged on the liquid distribution head assembly, each liquid outlet passage is connected with one inlet heat exchange tube, each inlet heat exchange tube is connected with the stroke heat exchange tube through a U-shaped tube, the stroke heat exchange tubes are provided with a plurality of sections, the multi-section stroke heat exchange tubes are communicated through the U-shaped tube and a claw-shaped tee joint, and finally are connected with two outlet heat exchange tubes, and the two outlet heat exchange tubes are connected with a gas collecting tube. According to the utility model, the refrigerant is split at a proper point in the heat exchanger, so that the pressure drop loss in the pipe is reduced, and the heat exchange efficiency is improved.

Description

Fin heat exchanger

Technical Field

The utility model relates to a heat exchanger, in particular to a fin heat exchanger.

Background

The conventional fin heat exchanger mainly adopts a single-inlet and single-outlet calandria mode, namely the number of inlet heat exchange tubes is the same as that of outlet heat exchange tubes, liquid refrigerant enters a tube pass from an inlet, and is converted into gas state along with the heat exchange, and the gas state is discharged from an outlet. In the actual use process, the superheat degree of the refrigerant at the outlet of the heat exchanger is higher, reverse heat conduction possibly occurs between the adjacent tube rows, and the higher superheat degree of the refrigerant outlet indicates that the refrigerant is in an overheated state in the heat exchange tube, and the overheated refrigerant has weaker heat exchange capacity. The flow path in the latter half of the heat exchanger thus contributes less to the heat exchange capacity of the entire heat exchanger. And the conventional liquid separation head is easy to separate liquid unevenly, so that the refrigerant liquid separation is uneven on the upper and lower sides of the fins due to the large-size fins, the heat exchange area of the heat exchanger cannot be fully utilized, and the stable and efficient operation of the heat exchanger cannot be well ensured.

Disclosure of Invention

The utility model aims to: in order to solve the problems in the prior art, the utility model provides the novel fin heat exchanger, refrigerant is split at a proper point in the heat exchanger, pressure drop loss in a pipe is reduced, and heat exchange efficiency is improved.

The technical scheme is as follows: the utility model relates to a fin heat exchanger, which comprises: the liquid separation head assembly is provided with a plurality of liquid outlet passages, each liquid outlet passage is connected with one inlet heat exchange tube, each inlet heat exchange tube is connected with the corresponding travel heat exchange tube through a U-shaped tube, the travel heat exchange tubes are multi-section, the multi-section travel heat exchange tubes are connected through a plurality of U-shaped tubes and a claw-shaped tee joint, one section of travel heat exchange tube is connected with the other two sections of travel heat exchange tubes through the claw-shaped tee joint, the other travel heat exchange tubes are connected through the U-shaped tubes, and finally the two outlet heat exchange tubes are connected with the gas collecting tube.

A preferred structure of the utility model is: the liquid distributing head assembly comprises a Venturi liquid distributing head, and a plurality of distributing pipes of the Venturi liquid distributing head are connected to the liquid outlet passage through connecting pipelines.

A preferred structure of the utility model is: the claw-shaped tee joint is connected to the position, after the inlet heat exchange tube, of the three-section stroke heat exchange tube.

A preferred structure of the utility model is: the U-shaped tube and the claw-shaped tee joint are communicated with the heat exchange tube through the through holes.

A preferred structure of the utility model is: the length of the gas collecting tube is consistent with the height of the tube plate.

A preferred structure of the utility model is: the heat exchange tube also comprises fins, wherein the fins are formed by a plurality of square fin units which are arranged in parallel, and the plane where the fins are positioned is parallel to the extending direction of the heat exchange tube.

A preferred structure of the utility model is: two fixing plates for fixing the fins are arranged on the upper side edge and the lower side edge of the fins.

A preferred structure of the utility model is: and a reinforcing rib is connected between the two fixing plates and is arranged in the middle of the fin.

The beneficial effects are that: (1) According to the novel fin heat exchanger designed by the utility model, the flow path of the refrigerant is divided into two parts at a proper position in the heat exchanger by changing the flow mode of the refrigerant in the heat exchange tube, so that the flow velocity of the refrigerant in the tube is reduced, and meanwhile, the heat exchange coefficient and the pressure drop gradient are reduced; (2) The utility model improves the heat exchange quantity of the heat exchanger on the premise of not changing the number of the pipelines in the heat exchanger, has low cost and is convenient for production and manufacture; (3) According to the utility model, the venturi type liquid separation head improves the uniformity of liquid separation, so that the heat exchange area of the heat exchanger is fully utilized, and the heat exchange performance is further improved.

Drawings

FIG. 1 is an overall construction diagram of a fin heat exchanger of the present utility model;

FIGS. 2 (a) and 2 (b) are side views from one end of the refrigerant inlet and outlet of FIG. 1;

FIG. 3 is a side view from opposite ends of the refrigerant inlet and outlet;

FIG. 4 is a schematic diagram of a heat exchange unit according to the present utility model;

FIG. 5 is an enlarged view of portion A (heat exchange unit) of FIG. 2 (b);

FIG. 6 is a schematic view of a venturi-type dispensing head according to the present utility model;

FIG. 7 is a front view of the present utility model from the side of the fin.

Detailed Description

Referring to fig. 1 to 4, the present utility model provides a fin heat exchanger, as shown in fig. 1, including: the liquid separation head assembly 10, the plurality of heat exchange tubes 20, the gas collecting tube 33, the tube plate 40 and the fins 50 are communicated with a refrigerant inlet, a plurality of liquid outlet passages are arranged on the liquid separation head assembly 10, and each liquid outlet passage is communicated with one heat exchange tube. In the present utility model, the heat exchange tubes 20 are divided into three types, namely, an inlet heat exchange tube 21, a stroke heat exchange tube 23 and an outlet heat exchange tube 25, but it should be understood that such types are merely required to facilitate understanding of the technical scheme, only the distinction is made in terms of names, and the heat exchange tubes themselves are only required to adopt conventional internally threaded copper tubes instead of limitations on the structure of the heat exchanger. Specifically, each liquid outlet passage on the liquid separation head assembly 10 is connected with one inlet heat exchange tube 21, each inlet heat exchange tube 21 is connected with a stroke heat exchange tube 23 through a U-shaped tube 31, the stroke heat exchange tubes 23 are in multiple sections, the multiple sections of stroke heat exchange tubes 23 are communicated through a plurality of U-shaped tubes 31 and a claw-shaped tee 32, specifically, a third section of stroke heat exchange tube 23 is connected with a fourth section of stroke heat exchange tube 23 and a fifth section of stroke heat exchange tube 23 through the claw-shaped tee 32, the fourth section of stroke heat exchange tube 23 and the fifth section of stroke heat exchange tube 23 are respectively connected with a subsequent stroke heat exchange tube through the U-shaped tubes 31 and are finally connected to two outlet heat exchange tubes 25, and the two outlet heat exchange tubes 25 are connected with a gas collecting tube 33.

In the utility model, the refrigerant inlet and the refrigerant outlet are arranged on the same side of the heat exchanger, namely the liquid distribution head assembly 10 and the gas collection tube 33 are positioned on the same side, so that the assembly operation is convenient. The tube plates 40 are two, namely a left tube plate and a right tube plate which are vertically arranged, the gas collecting tube 33 is vertically arranged in parallel with the right tube plate 40, and the length of the gas collecting tube 33 is consistent with the height of the tube plates 40. It should be noted that "left" and "right" described herein are taken in conjunction with the overall view of fig. 1, and are not limiting to the structure of the heat exchanger. Fig. 2 (a) is a schematic view of the outer end surface of the tube plate 40 from the side of the refrigerant inlet and outlet ends of the heat exchanger, and fig. 2 (b) is a schematic view of the tube plate end surface of the heat exchanger from which the liquid distributing head assembly and the gas collecting tube are removed based on fig. 2 (a), wherein the tube plate 40 is provided with a plurality of through holes, and the U-shaped tube 31 and the claw-type tee 32 are communicated with the heat exchange tube 20 through the through holes. Fig. 3 shows a schematic view from the other end of the heat exchanger (i.e., opposite the refrigerant inlet and outlet), and the tube sheet 40 at the other end also has a plurality of through holes, through which the U-tubes 31 pass to communicate with the heat exchange tubes 20.

In the present utility model, the stroke heat exchange tubes 23 communicating with each of the inlet heat exchange tubes 21 are three-stage. As shown in fig. 4, for example, a group of tube bundles including one inlet heat exchange tube 21, a plurality of stroke heat exchange tubes 23, two outlet heat exchange tubes 25, and connection tubes (U-shaped tube 31 and claw tee 32) therebetween is used as one heat exchange unit. It should be understood that the example of fig. 4 is for clearly showing the structure of the heat exchange unit, and is not limited to the specific structure, for example, the length of the heat exchange tube and the distance between the heat exchange tubes are appropriately changed in fig. 4 with respect to the overall structure shown in fig. 1 and 7, so that the structure thereof is more clearly understood. There may be a plurality of processes between the inlet heat exchange tube 21 and the claw tee 32, and there may be a plurality of processes between the claw tee 32 and the outlet heat exchange tube 25, not necessarily limited to the structure of fig. 4. Fig. 5 is an enlarged view of the portion a in fig. 2 (b), and is a side view of the heat exchange unit corresponding to fig. 4. Wherein 401 is the inlet of the refrigerant entering the heat exchanger, which is used for communicating with the liquid outlet passage of the liquid separating head assembly and communicating with the inlet heat exchanger; 403 and 405 are two outlets for communication with the header 33; three U-shaped pipes are connected with 6 sections of stroke heat exchange pipes, one claw-shaped tee joint is connected with one section of stroke heat exchange pipe and the other two sections of stroke heat exchange pipes, and finally two outlet heat exchange pipes are connected, wherein the refrigerant passes through the claw-shaped tee joint and then passes through four processes to reach two outlets and then enters the gas collecting pipe 33 in the example. The claw-type tee joint is utilized to split and combine the refrigerant at a proper point in the heat exchanger, so that the flow path of the refrigerant is split into two parts, the flow velocity of the refrigerant in the pipe is reduced, and the heat exchange coefficient and the pressure drop gradient are reduced. Because the inlet of the heat exchanger is the refrigerant in the two-phase state with lower dryness, the heat exchange coefficient is lower, at the moment, the flow arrangement in the heat exchanger adopts a single-tube arrangement mode, and the refrigerant gradually transits from the two-phase state with lower dryness to the even overheated state with higher dryness along with the heat exchange, at the moment, the arrangement mode of being divided into two parts is adopted to reduce the pressure drop loss in the tube. In view of the above, the heat exchanger is preferably arranged in a 'less-inlet and more-outlet' mode. Typically, the evaporator adopts a 17-in 34-out arrangement mode, refrigerant flows in through 17 capillary pipelines respectively, and each path of refrigerant is divided into 2 paths to flow to an outlet after flowing through a 4 th heat exchange tube.

In the utility model, the liquid distribution head assembly 10 internally comprises a Venturi liquid distribution head, and a plurality of distributing pipes of the Venturi liquid distribution head are connected to a liquid outlet passage through connecting pipelines. Fig. 6 is a schematic structural diagram of a venturi-type liquid-dividing head, after the refrigerant enters from an inlet, the venturi-type liquid-dividing head slightly contracts, the speed increases, the pressure decreases, the maximum value is reached when the refrigerant reaches the narrowest position, then the venturi-type liquid-dividing head decelerates and expands, like a nozzle, the refrigerant is sprayed into a distributing pipe, and the liquid-dividing is relatively uniform because the pressure is relatively high and the flow speed of the refrigerant is relatively high.

In the present utility model, the fins 50 are formed of a plurality of square fin units arranged in parallel, and the plane of the fins 50 is parallel to the extending direction of the heat exchange tube 20. Preferably, the fin material adopts hydrophilic aluminum foil fins. As shown in fig. 7, two fixing plates 51 for fixing the fins 50 are provided at the upper and lower sides of the fins 50. A reinforcing rib 52 is connected between the two fixing plates 51, and the reinforcing rib 52 is disposed in the middle of the fin 50. Can play a good role in fixing the heat exchanger.

The utility model improves the heat exchange quantity of the heat exchanger on the premise of not changing the number of the pipelines in the heat exchanger, has low cost and is convenient for production and manufacture. And the uniformity of liquid separation is improved, and the heat exchange area of the heat exchanger is fully utilized.

Claims

1. A fin heat exchanger, comprising: the liquid separation head assembly (10), a plurality of heat exchange tubes (20) and a gas collecting tube (33) communicated with a refrigerant inlet, wherein the plurality of heat exchange tubes (20) comprise inlet heat exchange tubes (21), stroke heat exchange tubes (23) and outlet heat exchange tubes (25), a plurality of liquid outlet passages are arranged on the liquid separation head assembly (10), each liquid outlet passage is connected with one inlet heat exchange tube (21), each inlet heat exchange tube (21) is connected with the stroke heat exchange tube (23) through a U-shaped tube (31), the stroke heat exchange tubes (23) are multi-section, the multi-section stroke heat exchange tubes (23) are connected through a plurality of U-shaped tubes (31) and one claw-shaped tee (32), one section of stroke heat exchange tubes are connected with the other two sections of stroke heat exchange tubes through the claw-shaped tee (32), the other stroke heat exchange tubes are connected through the U-shaped tubes (31), and finally the two outlet heat exchange tubes (25) are connected with the gas collecting tube (33).

2. The fin heat exchanger according to claim 1, wherein the liquid separation head assembly (10) comprises a venturi-type liquid separation head, several distribution pipes of which are connected to the liquid outlet passage by connecting pipes.

3. A fin heat exchanger according to claim 1, wherein a claw tee (32) is connected after the inlet heat exchange tube (21) at three passes of the stroke heat exchange tube (23).

4. The fin heat exchanger of claim 1, further comprising a tube sheet (40) provided with a plurality of through holes through which the U-shaped tubes (31) and the claw tees (32) communicate with the heat exchange tubes (20).

5. The fin heat exchanger according to claim 4, wherein the length of the header (33) coincides with the height of the tube sheet (40).

6. The fin heat exchanger according to claim 1, further comprising fins (50), the fins (50) being constituted by a plurality of square fin units arranged in parallel, the plane of the fins (50) being parallel to the direction in which the heat exchange tubes (20) extend.

7. A fin heat exchanger according to claim 6, wherein two fixing plates (51) for fixing the fin (50) are provided at upper and lower sides of the fin (50).

8. The fin heat exchanger according to claim 7, wherein a reinforcing rib (52) is connected between the two fixing plates (51), the reinforcing rib (52) being provided in the middle of the fin (50).