CN112361666A

CN112361666A - Staggered oblique-row internal-expansion type fin evaporator and forming method thereof

Info

Publication number: CN112361666A
Application number: CN202011294305.XA
Authority: CN
Inventors: 蒙永云; 王利春; 滕世政; 占利华; 薛晓伟; 周彬; 甘佑花; 程小爱
Original assignee: Zhejiang Kangshengke Industry And Trade Co ltd
Current assignee: Zhejiang Kangshengke Industry And Trade Co ltd
Priority date: 2020-11-18
Filing date: 2020-11-18
Publication date: 2021-02-12

Abstract

The invention discloses a staggered oblique-row internal-expansion type fin evaporator and a forming method, wherein the staggered oblique-row internal-expansion type fin evaporator comprises a plurality of layers of fin groups stacked from the bottom to the top, evaporation tubes penetrating and connecting the fins, and side plates for positioning the evaporation tubes, and is characterized in that the fin intervals in each group are arranged gradually in a density manner from the bottom layer to the top layer; each fin is provided with two hole sites which are horizontally arranged in parallel and are deviated to one side of the fin, and the hole sites in the two adjacent fin groups are deviated to opposite directions; a heater is arranged below the bottommost fin, and a liquid storage device is arranged at the outlet end of the evaporation tube. The heat exchange speed is accelerated, the installation space is saved, the volume of the refrigeration equipment is increased, the energy consumption is reduced, and the defrosting efficiency is high.

Description

Staggered oblique-row internal-expansion type fin evaporator and forming method thereof

Technical Field

The invention relates to a condenser manufacturing technology, in particular to a staggered inclined-row internal-expansion type fin evaporator mainly used for refrigeration equipment such as an air-cooled refrigerator, a freezer and the like and a forming method thereof.

Background

The evaporator is an important part for refrigerating the refrigerator, the purpose of refrigerating and freezing is achieved by utilizing the fact that liquid low-temperature refrigerant is easy to evaporate under low pressure, is converted into steam and absorbs heat of a cooled medium, and the material and the structure of the evaporator determine the heat exchange efficiency of the evaporator and directly influence the energy efficiency level of a refrigerator product.

The inclined insertion type fin evaporator generally used in the market at present has a fin opening basically designed as a chute, as shown in the attached drawing 11 of the specification, mainly the chute structure conforms to the simple installation of a U-shaped evaporation tube, and in the disclosed technology, for example, a patent publication No. CN208998381U, a fin evaporator and a refrigerator, and for example, a fin evaporator and a heat exchange device of a patent publication No. CN208671724, are all the traditional fin 20 opening structures.

The conventional structure fin holes and the evaporating tubes are in partial expansion joint of at most a semicircle, and the heat exchange efficiency is relatively low. The expansion type fin evaporator adopts the core rod to carry out expansion connection, and for the evaporator adopting the inner toothed tube, the mechanical tube expansion mode has larger damage to the tooth profile of the inner teeth, and simultaneously impurities such as aluminum scraps can be remained, so that the capillary tube is easily blocked in a refrigeration system, and the system fails.

Disclosure of Invention

The invention aims to solve the problems and provides a staggered inclined-row internal-expansion type finned evaporator and a forming method thereof.

The technical problem of the invention is mainly solved by the following technical scheme: a staggered oblique-row internal-expansion type finned evaporator comprises a plurality of layers of fin groups stacked from the bottom to the top, evaporating pipes penetrating and connecting the fins, and side plates for positioning the evaporating pipes, and is characterized in that the fin intervals in each group are arranged gradually in a density manner from the bottom layer to the top layer; each fin is provided with two hole sites which are horizontally arranged in parallel and are deviated to one side of the fin, and the hole sites in the two adjacent fin groups are deviated to opposite directions; a heater is arranged below the bottommost fin, and a liquid storage device is arranged at the outlet end of the evaporation tube.

In the staggered inclined-row internal-expansion type fin evaporator, preferably, the circumference of the through hole at the hole position is provided with a flanging perpendicular to the plane of the fin.

In the staggered inclined-row internal-expansion type fin evaporator, the flanging height is preferably 1-1.5 mm.

In the staggered inclined-row internal-expansion type finned evaporator, the evaporating tubes are preferably aluminum tubes with an internal tooth structure.

In the staggered inclined-row internal-expansion type fin evaporator, preferably, the lower section of the side plate is provided with a heater mounting hole groove.

In the staggered inclined-row internal-expansion type fin evaporator, preferably, the side plate is provided with inclined slotted holes, and the length of each inclined slotted hole is matched with the distance between corresponding hole sites on two adjacent layers of fin groups.

In the staggered inclined-row internal-expansion type finned evaporator, preferably, the evaporation tube is of a seamless tube body structure.

A forming method of a staggered inclined-row internal-expansion type finned evaporator is characterized by comprising the following steps:

firstly, a same pair of punching dies is adopted to punch the fins with the same specification and size to obtain two hole positions, and the position holding holes are flanged.

And secondly, preparing an aluminum pipe with an internal tooth structure, calculating the length of the evaporation pipe according to the product specification, and bending the evaporation pipe into a U shape.

And thirdly, preparing a plurality of groups of fins by taking the groups as units, wherein the number of the fins in each group is increased or decreased for standby.

Fourthly, utilize the hole site to pass the fin from the open one end of evaporating pipe and separate according to the group, the hole site in two sets of adjacent fins is arranged according to the reverse array of deviation, reserves equal interval L, requirement between two sets of adjacent fins: l is more than or equal to 3.14 × D/2+30mm, (D is the width of the fin).

Fifthly, fully expanding the evaporating pipe through a hydraulic internal expansion process;

sixthly, pressure is removed;

and seventhly, bending the evaporation tube with the fins at the space position between the two groups of fins to form a laminated shape.

Eighthly, aligning all the upper fins and the lower fins through twisting, and integrally forming a hole staggered tube diagonal structure.

Ninth, install the curb plate and other parts.

In the forming method of the staggered inclined-row internal-expansion type finned evaporator, when the fin groups are arranged on the evaporation tubes in a penetrating manner, the direction of the hole position flanging in each group is the same, and the direction of the hole position flanging in the two adjacent groups of fins is opposite.

In the forming method of the staggered inclined-row internal-expansion type fin evaporator, in the hydraulic internal-expansion type process, the tube expansion pressure is equal to the aluminum tube bursting pressure of-1 MPa, and the boosting rate is as follows: 0.1-1.0 MPa/s, boosting process: when the pressure is increased to half of the pipe expansion pressure, maintaining the pressure for 20 s; and (5) after the pressure is increased to the set pipe expansion pressure, maintaining the pressure for 30 s.

The evaporator adopting the technical scheme has the overall appearance structure of a cuboid structure and is composed of a plurality of layers of fins from the bottom, and all the fins are connected by an evaporation tube without any welding in the middle, so that the workload of blanking, welding, assembly and the like is reduced, and the defects of material change, cracks, welding slag and the like caused by welding are avoided.

The fin intervals in each group are gradually arranged from top to bottom from sparse to dense, so that wind power flow is facilitated, the heat exchange performance of products is higher, and the energy consumption is low; the performance of the integral evaporator not only meets the requirements of refrigeration equipment, but also can avoid the inherent defects of the inclined-insertion type fin evaporator and the pull-expansion type fin evaporator.

Furthermore, the circumference of the hole site through hole in the scheme is provided with a flanging, so that the fin and the evaporating pipe are mutually matched, the line is converted into the surface, the stability of the matching of the evaporating pipe and the fin is improved, and the heat exchange area between the evaporating pipe and the fin is increased. The aluminum pipe structure of internal tooth structure can increase body self intensity equally, has also improved the heat transfer effect. The side plates on two sides are used as supports, and are manufactured by a conventional method, and besides the bent positioning inclined slot holes of the evaporation tubes, the side plates are also provided with necessary auxiliary mechanisms such as heater mounting hole slots and the like.

According to the forming method of the staggered inclined-row internal-expansion type fin evaporator, the evaporating tubes and the fins are combined in an expansion mode through a hydraulic internal-expansion type process, and the fact that the internal tooth shape of the aluminum tube is not damaged is guaranteed. The part after tube expansion is bent to be in a laminated shape, and fins are aligned through a twisting device, so that the structural characteristic that the holes are staggered and the tubes are arranged obliquely is integrally formed. Before the standard cuboid basic structure of the evaporator is formed, the evaporating tubes and the fins are arranged in advance, and defects caused by assembly welding, hole machining and the like are avoided by using a skillful transposition forming method. The hole sites in two adjacent groups of fins are arranged in a deviation opposite array, the technical requirement of the distance L, the flanging direction of the hole sites, the design of the pressure of the expansion tube, the boosting rate, the pressure maintaining time and the like are all designed in advance, so that the sizes of all parts are in place at one time during bending forming, the evaporation tube is fully stressed, and the expansion tube is uniform.

In summary, compared with the prior art, the invention has the beneficial effects that:

the fins are arranged in a segmented reverse array mode, and the fins are bent and aligned to integrally form a hole staggered tube inclined row structure, multiple overlapping of evaporation tubes of each layer cannot be formed, so that more environmental wind introduced from a refrigerating chamber can be contacted, and the heat exchange speed is accelerated; meanwhile, the evaporator can be reduced in size due to the inclined arrangement structure of the evaporation tubes, the installation space is saved, and the volume of the refrigeration equipment is increased.

The fin interval is arranged gradually from the bottom of the evaporator to the top plate in a dense mode, so that excessive water bridges are prevented from being formed, the phenomenon that the defrosting time is prolonged due to serious frosting of the evaporator is avoided, and energy consumption is increased.

The aluminum pipe with the internal tooth is used as the evaporation pipe, so that the volume and the internal surface area in the evaporation pipe are increased, and the heat exchange speed can be accelerated; meanwhile, an aluminum pipe with a relatively small pipe diameter and internal teeth can be used for replacing a flat aluminum pipe with a large pipe diameter, and the material cost is reduced under the condition that the heat exchange efficiency meets the requirement.

The heater is installed at the bottom of the evaporator, hot gas naturally rises during heating and defrosting, and defrosting efficiency is high.

Drawings

FIG. 1 is a schematic diagram of an embodiment of the present invention.

FIG. 2 is a schematic view of a wind direction according to the present invention.

FIG. 3 is a schematic structural diagram of a sideplate-free state according to the present invention.

FIG. 4 is a schematic view of a fin construction of the present invention.

Fig. 5-8 are schematic views of the process of assembling and forming the evaporating tube and the fin of the present invention.

FIG. 9 shows the positional relationship of the fins between layers after molding.

Fig. 10 is a left partial view of fig. 3.

FIG. 11 is a schematic view of a conventional fin structure.

In the figure: 1. the heat exchanger comprises a side plate, 2 fins, 201 hole positions, 3 liquid reservoirs, 4 evaporating pipes, 5 heaters and 6 fans.

20. Conventional fins.

L-two adjacent groups of fins during the L-penetration; d-fin width.

Detailed Description

The technical scheme of the invention is further specifically described by the following embodiments and the accompanying drawings.

Referring to fig. 1, the staggered and inclined row internal expansion type finned evaporator of the present embodiment has a rectangular overall shape, the two ends of the length are side plates 1, and 8 layers of fin 2 groups are stacked from bottom to top between the two side plates 1, as shown in fig. 2 and 3, the 8 layers of fin 2 groups are connected into a whole by the penetration of evaporation tubes 4. The side plate 1 serves as a positioning evaporator tube component and an integral bracket. The fins 2 in each group are arranged in a density progressive manner from the bottom layer to the top layer. The bottom of the evaporator, namely the bottom fin 2 is provided with a heater 5, the lower section of the side plate 1 is provided with a heater 5 mounting hole groove, the length of the inclined groove holes is just matched with the distance between the corresponding hole positions 201 on the two adjacent layers of fin 2 groups, namely, the left hole on the lower group of fin 2 is corresponding to the left hole on the upper group of fin 2, the right group of fin is also corresponding, the upper hole and the lower hole are just inclined, and the two ends of the heater 5 are fixed on the side plate; the outlet end of the evaporation tube 4 is connected with a liquid reservoir 3.

Fig. 2 is a schematic view of wind direction, wherein the fan 6 can be arranged in the device integrally or separately.

The structure of the fins 2 is as shown in fig. 4, each fin 2 is a rectangular plate, two hole sites 201 which are horizontally arranged in parallel and are deviated to one side of the fin 2 (note: deviated to the length direction of the rectangular plate) are arranged on each fin 2, and in the whole evaporator, the hole sites 201 in the adjacent two layers of fin 2 are deviated to opposite directions, as shown in fig. 9 and 10.

The circumferences of the through holes of all the hole positions 201 are provided with flanges along the vertical direction of the plane of the fin 2, and the heights of the flanges are 1-1.5 mm.

The evaporating pipe 4 is designed into an aluminum pipe structure with an internal tooth structure, specifically, a group of tooth sheets are uniformly distributed along the inner wall of the aluminum pipe, and the height of the tooth sheets is generally one fourth of the diameter of the inner hole of the aluminum pipe. The evaporator tube 4 is a tube structure without any welding or other seams.

The forming method of the staggered inclined-row internal-expansion type finned evaporator comprises the following steps:

firstly, the same pair of punching dies is adopted to perform blanking and punching on the fins 2 with the same specification and size, so that two hole positions 201 are obtained, and the flanging structure of the hole positions 201 is maintained.

And secondly, preparing an aluminum pipe with an internal tooth structure as a raw material of the evaporation pipe 4, calculating the length of the evaporation pipe 4 according to the product specification, and bending the evaporation pipe into an equilateral U shape.

And thirdly, preparing 8 groups of fins 2 by taking the groups as units, and increasing the number of the fins 2 in each group for standby.

Fourthly, arranging fins on a sheet arranging die with an upper sheet arranging die plate and a lower sheet arranging die plate: utilize hole site 201 on fin 2, pass fin 2 from evaporating pipe 4 open one end to separate according to the group, hole site 201 in two sets of adjacent fins 2 arranges according to the opposite array of deviation to, as shown in fig. 5, dislocation distribution promptly, leaves equal interval L between two sets of adjacent fins 2, requires: l3.14 x D/2+30mm, (D being the width of the rectangular plate of fins 2, i.e. the thickness of the fin group).

When the fin 2 groups are arranged on the evaporating tube 4 in a penetrating way, the flanging directions of the hole sites 201 in each group are the same, the flanging directions of the hole sites 201 in the two adjacent groups of fins 2 are opposite, and after the next bending process, all the flanging directions are the same.

And pressing the upper die of the sheet arranging die.

One end of the evaporation tube 4 is sealed, and the other end is connected with the hydraulic tube. The water pressure is injected into the evaporation tube 4 for tube expansion. In the hydraulic internal expansion type process, the pipe expansion pressure is equal to the aluminum pipe explosion pressure of-1 MPa, and the aluminum pipe explosion pressure is a fixed value; the boosting rate: gradually pressurizing at 0.1-1.0 MPa/s; and (3) boosting: maintaining the pressure for 20s when the pressure is increased to one half of the pipe expansion pressure; and maintaining the pressure for 30s after the pressure is increased to the set pipe expansion pressure.

And fifthly, fully expanding the evaporating pipe 4 through a hydraulic internal expansion process to ensure that the evaporating pipe 4 is fully attached to the flanging part of the fin 2.

And sixthly, removing the water pressure, demolding from the sheet arranging mold, and blowing air into the device tube after tube expansion to remove residual moisture.

And seventhly, bending the penetrated fins 2 at the position of the space between the two groups of fins 2 to form a laminated shape, and referring to fig. 6 and 7, wherein the upper evaporation tube 4 and the lower evaporation tube 4 are positioned at the same vertical line position.

Eighthly, aligning all the upper fins and the lower fins by twisting along the width direction of the evaporator, and correspondingly inclining the connecting parts of the adjacent evaporation tubes 4 to form an inclined tube arrangement structure with staggered holes integrally.

Ninth, the side plate 1, the heater 5, the reservoir 3 and other components are installed.

And tenthly, performing leakage detection and drying treatment on the finished product.

The above embodiments are illustrative of the present invention, and are not intended to limit the present invention, and any simple modified structure of the present invention is included in the scope of the present invention.

Claims

1. A staggered oblique-row internal-expansion type finned evaporator comprises a plurality of layers of fin (2) groups stacked from bottom to top, evaporating pipes (4) for connecting the fins in a penetrating mode, and side plates (1) for positioning the evaporating pipes, and is characterized in that the fin intervals in each group are arranged gradually from bottom to top in a density mode; each fin is provided with two hole sites (201) which are horizontally arranged in parallel and are deviated to one side of the fin, and the hole sites in the two adjacent fin groups are deviated to opposite directions; a heater (5) is arranged below the bottommost fin, and a liquid storage device (3) is arranged at the outlet end of the evaporation tube.

2. The staggered slanted row internal expansion type finned evaporator as claimed in claim 1, wherein the through hole of the hole site (201) is provided with a flange on the circumference thereof, which is perpendicular to the plane of the fin.

3. The staggered inclined-row internal-expansion finned evaporator as claimed in claim 2, wherein the height of the flanging is 1-1.5 mm.

4. The offset slanted row internal expansion finned evaporator as claimed in claim 1, wherein the evaporating tubes (4) are of aluminum tube structure with internal tooth structure.

5. The staggered inclined row internal expansion type finned evaporator as claimed in claim 1, wherein the lower section of the side plate (1) is provided with a heater (5) mounting hole groove.

6. The staggered inclined row internal expansion type finned evaporator as claimed in claim 1, wherein the side plates (1) are provided with inclined slotted holes, and the length of the inclined slotted holes is matched with the distance between corresponding hole sites (201) on two adjacent layers of fin (2) groups.

7. The offset slanted row internal expansion finned evaporator as claimed in claim 1 or 4, wherein the evaporating tube (4) is a seamless tube structure.

8. The method for forming the staggered inclined row internal expansion finned evaporator according to any one of claims 1 to 7, comprising the following steps:

firstly, punching fins (2) with the same specification and size by adopting the same pair of punching dies to obtain two hole positions (201), and keeping the position holes turned over;

secondly, preparing an aluminum pipe with an internal tooth structure, calculating the length of the evaporation pipe (4) according to the product specification, and bending the evaporation pipe into a U shape;

preparing a plurality of groups of fins by taking the groups as units, wherein the number of the fins in each group is increased or decreased for standby;

fourthly, utilize hole site (201) to pass the fin from evaporating pipe open one end and separate according to the group, the hole site in two sets of adjacent fins is arranged according to the opposite array of deviation, reserves equal interval (L), requirement between two sets of adjacent fins: l is more than or equal to 3.14 × D/2+30mm, (D is the width of the fin);

fifthly, fully expanding the evaporating pipe (4) through a hydraulic internal expansion process;

sixthly, pressure is removed;

seventhly, bending the evaporation tube with the fins at the position between the two groups of fins to form a laminated shape;

eighthly, aligning all the upper fins and the lower fins through twisting, and integrally forming a hole staggered tube inclined row structure;

ninth, install the curb plate (1) and other parts.

9. The forming method of the staggered inclined row internal expansion type finned evaporator according to claim 8, wherein when the groups of fins (2) are arranged on the evaporating pipe (4) in a penetrating manner, the flanging directions of the hole sites (201) in each group are the same, and the flanging directions of the hole sites in two adjacent groups of fins are opposite.

10. The forming method of the staggered inclined-row internal-expansion finned evaporator according to claim 8, wherein in the hydraulic internal-expansion process, the tube expansion pressure is equal to the aluminum tube burst pressure of-1 MPa, and the pressure increase rate is as follows: 0.1-1.0 MPa/s, boosting process: when the pressure is increased to half of the pipe expansion pressure, maintaining the pressure for 20 s; and (5) after the pressure is increased to the set pipe expansion pressure, maintaining the pressure for 30 s.