WO2019161657A1

WO2019161657A1 - Block fluid distributor and manufacturing method therefor

Info

Publication number: WO2019161657A1
Application number: PCT/CN2018/104764
Authority: WO
Inventors: 奚龙; 张举飞; 王健; 荣彬彬; 吴娜
Original assignee: 江苏宝得换热设备股份有限公司
Priority date: 2018-02-23
Filing date: 2018-09-10
Publication date: 2019-08-29
Also published as: CN108088300A; CN108088300B

Abstract

Disclosed is a block fluid distributor, comprising a lower stamped sheet (1), a fluid distribution block (2) and an upper stamped sheet (3). The manufacturing process for the block fluid distributor comprises the following procedures: material preparation, the stamping of a lower heat exchange sheet (4), the stamping of an upper heat exchange sheet (5), the stamping of the lower stamped sheet (1), the stamping of the upper stamped sheet (3), machining, copper plating, pre-assembly, pre-pressing, brazing and quality inspection. The present invention has the advantages of being precise in terms of the size of a distribution hole, not tending to block the distribution hole, being low in manufacturing costs, etc.

Description

Block fluid dispenser and manufacturing method thereof

Technical field

This invention relates to plate heat exchangers, and more particularly to fluid dispensers in plate heat exchangers and methods of making same.

Background technique

The plate heat exchanger is an ideal equipment for heat exchange between liquid-liquid and liquid-vapor. It has a series of advantages such as high heat exchange efficiency, small heat loss, compact structure and light weight, small floor space and long service life. Widely used in metallurgy, mining, petroleum, chemical, electric power, medicine, food, chemical fiber, paper, textile, shipbuilding, heating and other departments. Moreover, it can be used for various situations such as heating, cooling, evaporation, condensation, sterilization, and waste heat recovery. Plate heat exchangers are mainly detachable and welded. In contrast, welded heat exchangers have the advantages of temperature bearing, strong pressure bearing capacity and good corrosion resistance, so the range of welding heat exchangers is used. More extensive.

The welded heat exchanger can be further divided into a semi-welded heat exchanger, a full welded heat exchanger, a plate passenger heat exchanger, and a brazed plate heat exchanger. Brazed plate heat exchangers can be used as condensers and evaporators in the refrigeration industry due to their low heating temperature, smooth joints, small changes in microstructure and mechanical properties, and accurate workpiece dimensions. They can be used as alcohol in the chemical industry. Cooler for fermentation, etc. The brazed heat exchanger has an operating temperature range of -160 ° C to +225 ° C and a working pressure range of 0.01 MPa to 3.2 MPa.

As an important part of the brazed plate heat exchanger, the fluid distributor can reasonably separate the hot and cold fluids, so that they flow in the flow channels on both sides of each plate, and exchange heat through the plates. At present, the fluid distributors commonly used in brazed plate heat exchangers mainly include gasket type distributors and pressure groove type distributors. The gasket type distributor is connected as a separate part to the heat exchange plate by welding. The advantage is that the distribution hole size is accurate and not easy to block. The disadvantage is that the part size is relatively large, the manufacturing assembly process is complicated, and the cost is high. The pressure groove type distributor and the heat exchanger plate base material are integrally molded, which has the advantages of simple process and low batch cost, and the disadvantage is that the distribution hole size is low in accuracy and the distribution hole is easy to be blocked.

How to combine the advantages of the gasket heat exchanger and the groove type to circumvent the respective disadvantages is a technical difficulty in the industry. Therefore, it is urgent to propose an accurate distribution hole size and easy to block, and the manufacturing process is simple and the cost is low. new technology.

Summary of the invention

The technical problem to be solved by the present invention is to propose a novel fluid dispenser, a block fluid dispenser, and a production process thereof for the disadvantages of inaccurate distribution pore size, easy clogging, complicated manufacturing process and high cost of the common fluid dispenser.

The technical solution adopted by the present invention to solve the above problems is: a bulk fluid dispenser, which is a lower pressing piece, a fluid distributing block and an upper pressing piece from bottom to top, as shown in FIG. The fluid distributor lower pressing sheet and the lower heat exchange sheet adopt an integrated stamping forming process; the fluid distributor upper pressing sheet and the upper heat exchange sheet also adopt an integrated stamping forming process, as shown in FIG. 2 . The fluid distribution block in the fluid distributor is connected to the lower pressing piece, the lower heat exchange piece, the upper pressing piece and the upper heat exchange piece by brazing.

The lower heat exchange sheet is made of stainless steel. The lower heat exchange sheet has a thickness ranging from 0.3 to 0.4 mm, and its surface is a herringbone corrugation.

Preferably, the herringbone corrugation angle ranges from 120° to 140°, and the herringbone corrugation thickness ranges from 1.5 to 2.5 mm.

The upper heat exchange sheet is made of stainless steel. The upper heat exchange sheet has a thickness ranging from 0.3 to 0.4 mm, and the surface thereof is a herringbone corrugation.

Preferably, the chevron ripple on the surface of the upper and lower heat exchange fins is a conjugate corrugation, that is, the upper and lower heat exchange fins have the same angle of the chevron ripple and the same thickness, but the chevron shape is opposite.

The lower pressing piece has the same thickness as the lower heat exchange piece, and the lower pressing piece surface has an upwardly convex annular groove.

Preferably, the angle between the two end faces of the upper convex annular groove and the plane of the lower pressing piece is 40° to 50°;

Preferably, the angle of the lower end line of the upper convex annular groove is in the range of 40° to 60°;

Preferably, the angle between the two sides of the upper convex annular groove ranges from 80° to 100°;

Preferably, the upper convex annular groove has a height dimension ranging from 1.5 to 2.5 mm, which is the same height as the lower heat exchange fin herringbone corrugation;

Preferably, the upper surface of the upper convex annular groove has a length ranging from 2.2 to 2.8 mm.

The upper pressing piece and the upper heat exchange piece have the same thickness, and the upper pressing piece surface has an annular groove which is recessed downward.

Preferably, the angle between the two end faces of the concave annular groove and the plane of the upper pressing piece is 40° to 50°;

Preferably, the angle of the lower end line of the concave annular groove is in the range of 40° to 60°;

Preferably, the angle between the two sides of the concave annular groove is in the range of 80° to 100°;

Preferably, the recessed annular groove has a height dimension ranging from 1.5 to 2.5 mm, which is the same height as the upper heat exchange fin herringbone corrugation;

Preferably, the upper surface of the concave annular groove has a length ranging from 2.2 to 2.8 mm.

Preferably, the concave annular groove is symmetric with the upper convex annular groove, so the corresponding sizes of the two are the same.

The fluid distribution block is made of carbon steel which is easy to process and has a shape similar to a fan shape.

Preferably, the fluid distribution block has a thickness ranging from 3.5 to 4.3 mm;

Preferably, the angle of the two side end lines of the fluid distribution block ranges from 40° to 60°;

Preferably, the angle between the left and right sides of the fluid distribution block ranges from 80° to 100°;

Preferably, the fluid distribution block has a width dimension ranging from 5 to 7 mm;

Preferably, the fluid distribution block uniformly distributes three identical tapered through holes, and the diameter of the outlet opening of the tapered through hole is related to the type of the refrigerant and the heat dissipation area, and the diameter of the outlet of the tapered through hole can be set according to a specific case. The diameter of the outlet opening of the tapered through hole ranges from 0.8 to 2 mm;

Preferably, the fluid distribution block has a tapered through-hole taper ranging from 1:12 to 1:10;

Preferably, the fluid distribution block has a conical through hole with an angle ranging from 12° to 18°;

Preferably, the fluid distribution block has a chamfer size ranging from 0.3 to 0.8 mm;

Preferably, the sum of the angles between the two end faces of the upper convex and concave annular grooves and the sharp angles of the lower and upper pressing plates is equal to the angle between the left and right sides of the fluid distribution block.

The invention also provides a method for manufacturing the above-mentioned bulk fluid dispenser, the steps of which are as follows:

(1) Preparation: prepare stainless steel sheets, copper foils and carbon steel blocks of corresponding size;

(2) Heat exchange sheet under stamping: the stainless steel sheet is punched into a corresponding lower heat exchange sheet shape by a punching machine;

(3) stamping upper heat exchange sheet: the stainless steel sheet is punched into a corresponding upper heat exchange sheet shape by a punching machine;

(4) Pressing under pressing: using a punching machine to punch out the above-mentioned distributor under the corresponding position of the heat exchange sheet;

(5) Pressing and pressing the sheet: using a punching machine to punch out the above-mentioned dispenser on the corresponding position of the heat exchange sheet;

(6) Machining: The carbon steel block is processed into the shape of the above-mentioned distribution block by using a numerical control machine tool;

(7) Copper plating: a copper film is plated on the surface of the above distribution block by electroplating technology, and the thickness of the copper film ranges from 0.04 to 0.07 mm;

(8) pre-assembly: pre-assembling the above lower heat exchange sheet, the lower press of the distributor, the distribution block, the copper foil, the upper press on the distributor, and the upper heat exchange sheet in the manner of FIG. 5;

(9) Preloading: pre-pressing the above pre-assembled fluid distributor by a press, the pre-pressure is set to 0.5 to 4.5 MPa;

(10) Brazing: the above pre-pressurized fluid distributor is placed in a vacuum furnace for brazing, the furnace temperature is 1100 to 1150 ° C, and the brazing time is 8 to 10 hours;

(11) Quality inspection: Quality inspection of the above-mentioned bulk fluid dispenser is carried out according to national standards or industry standards or enterprise standards. The quality inspection link is interspersed in every manufacturing process.

The advantages of the present invention over the prior art are:

1. In the present invention, the upper and lower pressing sheets and the upper and lower heat exchange sheets adopt an integrated stamping technique, and the process is simple, and thus the manufacturing cost is low.

2. In the present invention, the tapered through-hole of the distribution block is processed by a numerical control machine, and the dimensional error is small, so that the flow control accuracy of the distributor is high.

3. In the present invention, the diameter of the outlet opening of the conical through hole of the distribution block is small, so that the flow rate of the refrigerant at the liquid outlet of the distribution block is increased, and turbulent flow is more easily formed in the cavity of the heat exchange sheet, and the heat exchange efficiency is increased.

4. In the present invention, the inlet block of the distribution block has a large diameter, the diameter of the outlet port is small, impurities in the refrigerant are not easily deposited in the tapered through hole, and the single distribution block has a plurality of tapered holes, thereby greatly reducing The probability that the dispenser is blocked.

5. In the invention, the surface of the distribution block is plated with a copper film, and the copper material has the advantages of low melting point and good ductility, and is brazed after pre-assembly and pre-pressing steps, thereby greatly improving the distributor and the upper and lower pressures. Sealing properties between sheets.

DRAWINGS

BRIEF DESCRIPTION OF THE DRAWINGS Fig. 1 is a schematic view showing the structure of the present invention, wherein 1 is a lower pressing piece, 2 is a fluid distributing block, and 3 is an upper pressing piece.

2 is a schematic view showing the connection relationship between the upper and lower heat exchange sheets and the upper and lower pressing sheets in the present invention, wherein 4 is a lower heat exchange sheet and 5 is an upper heat exchange sheet.

Fig. 3 is a schematic view showing the herringbone shape of the lower heat exchange sheet of the present invention.

Fig. 4 is a schematic view showing the chevron of the upper heat exchange sheet of the present invention.

Fig. 5 is a schematic view showing the connection of the distribution block to the upper and lower pressing sheets and the upper and lower heat exchange sheets in the present invention.

Figure 6 is a front elevational view of the lower tablet in the present invention.

Figure 7 is a plan view of a depressed portion of the present invention.

Figure 8 is a front elevational view of the upper tablet in the present invention.

Figure 9 is a top plan view of the upper press in the present invention.

Figure 10 is a front elevational view of the dispensing block of the present invention.

Figure 11 is a half cross-sectional view of the distribution block of the present invention.

Specific embodiment

The invention is further described in detail below with reference to the accompanying drawings.

The specific technical solution adopted by the present invention is a block fluid dispenser.

From bottom to top, the lower tablet 1, the fluid distribution block 2 and the upper tablet 3 are shown in Fig. 1. The lower pressing piece 1 and the lower heat exchange piece 4 adopt an integrated stamping forming process, and the upper pressing piece 3 and the upper heat exchange piece 5 also adopt an integral stamping forming process, as shown in FIG. 2 . The upper and lower heat exchange fins are conjugated herringbone corrugations, and the herringbone angle is 130°, as shown in FIGS. 3 and 4. The fluid distribution block 2 in the fluid distributor is respectively connected to the lower pressing piece 1, the lower heat exchange piece 4, the upper pressing piece 3, and the upper heat exchange piece 5 by brazing, as shown in FIG. 5, wherein the A hole is a liquid inlet. a hole in which the liquid enters the open space formed by the upper and lower heat exchange sheets through the fluid distributor; the D hole is a liquid outlet hole through which the liquid flows out of the heat exchange piece cavity; and the B hole and the C hole are sealed holes, the liquid It is impossible to enter the heat exchange sheet through these two holes.

The fluid dispenser has a thickness of 0.36 mm and a surface having an upwardly convex annular groove as shown in Figs. 6 and 7. The angle of the lower end line of the upper convex annular groove is a=50°; the angle between the two end faces of the upper convex annular groove and the plane of the lower pressing piece is 45°; the angle between the two sides of the upper convex annular groove is b=90 The upper convex annular groove has a height dimension c=2 mm, which is consistent with the height of the lower heat exchange fin herringbone corrugation; the upper convex annular groove upper surface length dimension d=2.5 mm. The pressure on the fluid distributor is 0.36 mm. The surface has an annular groove recessed downward, as shown in FIGS. 8 and 9. The angle of the lower end line of the concave annular groove is e=50°; the angle between the two end faces of the concave annular groove and the plane of the lower pressing piece is 45°; the angle between the two sides of the lower annular groove is f=90 °; the lower concave annular groove height dimension g = 2mm, which is consistent with the upper heat exchange fin herringbone corrugation; the upper concave annular groove upper surface length dimension h = 2.5mm. The distribution block of the fluid distributor is as shown in FIG. 8 and FIG. 9 , and the thickness dimension thereof is j=3.9 mm; the angle of the two side end lines of the fluid distribution block is n=50°; the angles of the left and right sides of the fluid distribution block are both l=90°; the fluid distribution block width dimension m=6.4 mm; the fluid distribution block uniformly distributes three identical tapered through holes, the refrigerant used in the embodiment is R410A, and the heat exchange sheet heat exchange area is 0.05 mm. ² , thus taking the diameter of the outlet opening of the tapered through hole i=1mm; the taper of the conical through hole of the fluid distributor is p=1:11; the angle of the conical through hole of the above fluid distribution block is k=15°; the above fluid distribution The block chamfer size is 0.5 mm.

The invention also proposes a manufacturing process of the above fluid dispenser, which comprises the following specific steps:

(1) Preparation: prepare stainless steel sheet, copper foil and 20# carbon steel block of corresponding size;

(6) Machining: The 20# carbon steel block is processed into the above-mentioned distribution block shape by a numerical control machine tool;

(7) Copper plating: a copper film is plated on the surface of the above distribution block by electroplating technology, and the thickness of the copper film is 0.05 mm;

(9) Preloading: pre-pressing the above pre-assembled fluid distributor with a press, the pre-pressure is set to 2 MPa;

(10) Brazing: the above pre-pressurized fluid distributor is placed in a vacuum furnace for brazing, the furnace temperature is 1135 ° C, and the brazing time is 9 hours;

(11) Quality inspection: Quality inspection of the above-mentioned bulk fluid dispenser is carried out according to national standards or industry standards or enterprise standards. The quality inspection link is interspersed in each manufacturing process;

The above are only the preferred embodiments of the present invention, and those skilled in the art can make various changes or equivalents to these features and embodiments without departing from the spirit and scope of the invention. In addition, these features and embodiments may be modified to adapt to the specific circumstances and materials without departing from the spirit and scope of the invention. Therefore, the present invention is not limited by the specific embodiments disclosed herein, and all the embodiments falling within the scope of the claims of the present invention fall within the scope of the present invention.

Claims

The utility model relates to a block fluid distributor, characterized in that: from bottom to top, a lower pressing piece, a fluid distributing block and an upper pressing piece respectively; the lower pressing piece and the lower heat exchange piece of the heat exchanger adopt an integral stamping forming process The upper pressing piece and the upper heat exchange sheet of the heat exchanger adopt an integrated stamping forming process; the fluid distributing block in the fluid distributor is respectively used with the lower pressing piece, the lower heat exchange piece, the upper pressing piece and the upper heat exchange piece; Brazed connection.
A bulk fluid dispenser according to any of the preceding claims, wherein the lower sheet has the same thickness as the lower sheet and the lower sheet surface has an upwardly convex annular groove.
A bulk fluid dispenser according to claim 2, wherein the angle between the two end faces of the upper convex annular groove and the plane of the lower pressing piece is 40° to 50°; the lower surface of the upper convex annular groove The angle of the end line is 40°-60°; the angle between the two sides of the upper convex annular groove is 80°-100°; the height of the upper convex groove is 1.5-2.5mm, which is the same as the height of the lower heat exchange sheet; The upper surface of the upper convex annular groove has a length of 2.2 to 2.8 mm.
A bulk fluid dispenser according to claim 1 wherein the upper tab has the same thickness as the upper fin and the upper tab surface has an annular recess that is recessed downwardly.
A bulk fluid distributor according to claim 4, wherein the angle between the two end faces of the concave annular groove and the plane of the upper pressing piece is 40 to 50; the lower surface of the concave annular groove The angle of the end line is 40°-60°; the angle between the two sides of the concave annular groove is 80°-100°; the height of the lower annular groove is 1.5-2.5mm, which is the same as the height of the upper heat exchange sheet; The upper surface of the concave annular groove has a length of 2.2 to 2.8 mm.
A bulk fluid distributor according to claim 3 or 5, wherein said upper convex annular groove and said lower annular groove are symmetric structures, and the corresponding sizes of the two are the same.
A bulk fluid dispenser according to any of the preceding claims, wherein the fluid distribution block is made of carbon steel that is easy to process.
A bulk fluid distributor according to claim 7, wherein said fluid distribution block has a thickness of 3.5 to 4.3 mm; and said fluid distribution block has an angle of 40 to 60 degrees at both side ends; The angle between the left and right sides of the fluid distribution block is 80°-100°; the width of the fluid distribution block is 5-7 mm; the fluid distribution block uniformly distributes three identical tapered through holes, and the diameter of the outlet opening of the tapered through hole is The type of refrigerant is related to the heat dissipation area. The diameter of the outlet of the tapered through hole can be set according to the specific case. The diameter of the outlet of the tapered through hole is 0.8 to 2 mm; the taper of the tapered through hole of the above fluid distribution block is 1: 12～1:10; the angle of the through hole of the fluid distribution block is 12°-18°; the chamfer size of the fluid distribution block is 0.3-0.8 mm; the thickness of the copper plating layer on the surface of the fluid distribution block is 0.04-0.07 mm.
A bulk fluid dispenser according to claim 3 or 5 or 8, wherein the sum of the two end faces of the upper convex and concave annular grooves and the plane of the lower and upper pressing plates is equal to the fluid distribution. The angle between the left and right sides of the block.
A method of manufacturing a bulk fluid dispenser according to any of the preceding claims, wherein the method comprises the steps of:

(1) Preparation: prepare stainless steel sheets, copper foils and carbon steel blocks of corresponding size;

(2) Heat exchange sheet under stamping: the stainless steel sheet is punched into a corresponding lower heat exchange sheet shape by a punching machine;

(3) stamping upper heat exchange sheet: the stainless steel sheet is punched into a corresponding upper heat exchange sheet shape by a punching machine;

(4) Pressing under pressing: using a punching machine to punch out the above-mentioned distributor under the corresponding position of the heat exchange sheet;

(5) Pressing and pressing the sheet: using a punching machine to punch out the above-mentioned dispenser on the corresponding position of the heat exchange sheet;

(6) Machining: The carbon steel block is processed into the shape of the above-mentioned distribution block by using a numerical control machine tool;

(7) Copper plating: a copper film is plated on the surface of the above distribution block by electroplating technology, and the thickness of the copper film ranges from 0.04 to 0.07 mm;

(8) pre-assembly: pre-assembling the above lower heat exchange sheet, the lower press of the distributor, the distribution block, the copper foil, the upper press on the distributor, and the upper heat exchange sheet in the manner of FIG. 5;

(9) Preloading: pre-pressing the above pre-assembled fluid distributor by a press, the pre-pressure is set to 0.5 to 4.5 MPa;

(10) Brazing: the above pre-pressurized fluid distributor is placed in a vacuum furnace for brazing, the furnace temperature is 1100 to 1150 ° C, and the brazing time is 8 to 10 hours;

(11) Quality inspection: The above-mentioned block fluid distributor is inspected according to national standards or industry standards or enterprise standards, and the quality inspection links are interspersed in each manufacturing process.