TW386049B - Heat transfer tube with cross-grooved and method of manufacturing thereof - Google Patents

Description

[Brief Description of the Drawings] FIG. 1 is an enlarged oblique drawing showing a cross groove '′ 形成 forming an inner surface of a heat transfer tube according to the present invention. Fig. 2 (i) shows a plan view of the heat transfer tube in Fig. 1. Fig. 3 僳 A cross-sectional view taken along line I-H [of Fig. 2 to show the cross-sectional shape of the spiral groove. Fig. 4 is a cross-sectional view taken along line IV-IV of Fig. 2 for the purpose of showing the shape of the auxiliary groove. Fig. 5 (a) schematically shows a manufacturing method for forming a heat transfer tube in the inner groove according to the present invention. Figures 6 to 8 show the evaporation heat transfer performance, condensation heat transfer performance, and pressure of the heat transfer tube and the previous heat transfer tube according to a good embodiment of the present invention (please read the precautions on the back before filling this page) Table of loss of printing power of employees 'cooperatives in the Intellectual Property Bureau of the Ministry of Economic Affairs. Figure 9 shows the cross-ditch formation of heat transfer tubes-' Example No. 1-which is 9A. Figure, Figure 9B is a plan view, and Figure 9C is a section 圔 cut along the line AA of 9B 圔. Description of main component symbols: 1, 11 spiral groove 2, 12 sub-groove 2, upstream side > 1- 刖 face 2 '' downstream side back surface 3, 13 protrusion 5 metal strip 6, 7, 8 stick wheel 9 Induction coil 10 Stick wheel 14 Protruding part This paper size is applicable to Chinese National Standard (CNS) A4 specification (210X297 mm) Printed by A7 __B7 _-_ Ear, Invention Description (1) [Industrial Field of use] When the present invention relates to a heat transfer tube for a heat exchanger, in more detail, there is an improvement of a heat transfer tube that forms a cross groove in order to improve the fluidity and heat transfer characteristics of the heat transfer tube. '· ..........--- [Advanced Technology] The heat exchangers used in evaporators, condensers, or heating tubes of air conditioners or refrigerators are freons used in the tubes. (Dichlorodifluoromethane freon) and other heat transfer tubes required for heat exchange with fluid flowing outside the tube to evaporate or condense. As such a heat transfer pipe, a heat transfer pipe having a groove formed on the inner surface is mainly used from the viewpoints of high efficiency and energy saving. That is, because the heat transfer tube is formed with a spiral groove in the shape of a fine triangle or a ladder on the inner surface of the tube, the surface tension in the groove and the spiral groove. flow. If such a heat transfer tube is used in a condenser, the protrusions between the grooves will cause the turbulent flow of the refrigerant fluid to become active and improve the condensability. However, the protrusions will act as condensed nodules. Conversely, when such a heat transfer tube is used in an evaporator, the edges of the grooves make the refrigerant flow cross-stirred and active, and the evaporation retention of the refrigerant fluid supplied to the interior of the heat transfer tube will be improved. However, at the edges of the grooves, Then it will produce bubbles as the evaporation nucleation. U.S. Patent No. 4,658,892 issued to Shinohara et al. On April 21, 1987, falsely indicates that there is a range in which the pressure loss of the fluid inside the tube does not substantially increase, and a deep groove is formed continuously on the inner surface of the tube. Heat pipe 〇 This paper size applies Chinese National Standard (C.NS) Α4 specification (210 × 297 mm) (Please read the precautions on the back before filling this page) > n ^ im nn IK—Jy fi--1 » I— »1 · .¾ · νδ Printed by A7 ____B7_, the Consumer Cooperatives of the Central Procurement Bureau of the Ministry of Economic Affairs. 5. Description of the invention (2) If according to the above S hi η hara patent, the depth of the inner diameter (D i) (Hf) ratio (Hf / Di) is 0.02 to 0.03, and the groove spiral angle for the tube axis is 7 ° ~ 3Q °. In addition, the ratio of the cross-sectional area (S) of the portion formed by each groove to the depth (Hf) is (3.15 to 0.4), and the range of the apex angle of the ridge section between the trenches is 3 Q ~ 6 Q °. According to the heat transfer tube disclosed in the above-mentioned patents such as Hi ηhara, the refrigerant fluid supplied to the heat transfer tube is continuously formed in a spiral shape along the spiral groove and spreads the heat throughout the heat transfer tube. Most of the inner surface of the tube is enlarged. Therefore, the metal surface and the refrigerant fluid do not come in direct contact with each other, and there is a problem that the condensation efficiency is lowered. In order to improve the heat transfer characteristics, a spiral groove is formed and it intersects at a predetermined angle. A heat transfer tube having a plurality of secondary trenches formed at regular intervals (refer to U.S. Patent No. 4,7 3,3,998, which was given to _Sat 0, etc. on March 29, 1988). For example, In Fig. 9A, the heat transfer tube is formed by a cross groove formed by crossing the spiral groove (11) at a certain angle, and the auxiliary groove (1 2) inclined at an angle larger than the spiral angle of the spiral groove (1). The cross-groove heat transfer pipe i has an internal surface area increased by the auxiliary groove (12), so The heat transfer rate will increase. Also, not only the inner edge of the tube is increased, the stirring of the refrigerant fluid engraved by the secondary grooves inclined to the spiral grooves in the direction of the tube axis will become more active. This will improve the refrigerant fluid. The advantages of its evaporation characteristics and other advantages gradually expand its range of use. However, the heat transfer tubes forming cross grooves in the prior art are formed on the protrusions (1 3) and The auxiliary groove (1 2) between the protrusions (1 3) generates a vortex on the back surface downstream of the protrusions (1 3). This kind of vortex is generated, and the inside of the tube becomes a resistance to the long-term flow of the refrigerant fluid. The dimensions are applicable to China National Standard (CNS) A4 specifications (210X 297 mm) (Please read the precautions on the back before filling this page)

• The Consumer Cooperatives of the Central Standards Bureau of the Ministry of IT and Economy printed A7 B7Λ, and the description of the invention (3) forces to reduce the heat transfer performance of the area where eddy currents are generated. In the manufacture of the above-mentioned heat transfer tube, first, the helical groove (1 1) is formed by upsetting, and then the auxiliary groove (1 2) is formed by upsetting, as shown in FIG. 9B, when the auxiliary groove is formed. A protrusion (1 4) is generated on the processed spiral groove (η) side. And the protruding part (14) of this method pseudo-increases the fluid resistance and reduces the turbulent flow effect of the spiral groove. Therefore, the preceding cross groove forms the opposite side of the heat transfer tube with high heat transfer performance, and there is a problem that the pressure loss inside the tube will increase significantly. In order to solve this problem, Japanese Patent Laid-Open Publication No. 97-1 4 7 7 8 6 shows that the first groove of the rectangular or reverse ladder shape is linearly formed to a certain depth (状), With a certain pitch (P), and at the same time, the second groove shallower than the first groove intersects in a majority spiral, so that the ratio of the first groove to the groove bottom groove width (S) of the groove pitch (P) is S / P < 1/2, a heat transfer tube having a ratio of groove depth (L) to the groove (S) of the first groove of L / S > 1/2. As described above, even if the heat transfer performance is increased and the pressure loss is increased, a larger power is required for the refrigerant fluid to flow inside the tube. Therefore, the leading heat pipe has the disadvantage that the heat transfer performance is half proportional to the energy efficiency. [Problems to be Solved by the Invention] In order to solve the problems as described above, the present invention aims to provide a heat transfer tube forming a cross groove that can improve heat transfer performance without increasing pressure loss, and a method for manufacturing the same. [Means for Solving the Problem] In order to achieve the above-mentioned object, if the first special feature of the present invention is to provide a whole inner peripheral surface of a metal pipe with a circular cross-section, Note on the back then fill in this buy) Pack. Order

• 1J This paper size applies the Chinese National Standard (CNS) Λ4 specification (210X 297 mm) Printed by the Consumer Cooperative of the Central Shake Bureau of the Ministry of Economic Affairs A7 B7 * _ 5. Description of the invention (4) Spiral with a certain spiral angle on the axis The plurality of grooves are formed in parallel to each other, and the heat transfer tube is formed by crossing the spiral grooves at a certain angle to form the auxiliary grooves. The spiral angle (") of the spiral grooves of the longitudinal axis of the tube is 10 ° ~ 4 0 °, preferably 18 ° ~ 2 5 °, the cross groove angle (/?) Of the secondary groove of the spiral groove is 75 ° ~ 105 °, preferably 90 °, and the secondary groove has almost the same as the tube spiral groove A right-angled vertical wall and an inclined wall inclined at a certain angle to the above-mentioned spiral groove, and a cross groove with a width ratio of 0.2 to 1.0 of the upper section of the protrusion on the upper opening of the auxiliary groove, form a heat transfer tube. 1 The inclination angle between the vertical wall and the inclined wall is 90 ° ~ 105 for the spiral groove of each tube. And 30. ~ 60. Better. Further, it is preferable that the sub-groove depth ratio of the spiral groove depth is 0.5 to 1.0. According to the second feature of the present invention, it is provided that the inner peripheral surface of the entire metal pipe including a circular cross section has a triangular or reverse ladder shape with a predetermined spiral angle for the longitudinal direction of the tube. The spiral grooves are formed in parallel, The spiral grooves intersect at a predetermined angle to form a cross-shaped groove having a secondary groove having a larger angle than the predetermined spiral angle to form a heat transfer tube, a metal strip having a predetermined width. The stage of forming the secondary groove; The stage of forming the helical groove of the above-mentioned auxiliary groove of the gold bar; and the stage of forming the surface of the above-mentioned auxiliary groove and the helical groove of the metal strip forming groove into a tube shape with a predetermined diameter in a state facing inward; And a method for manufacturing a heat transfer tube having a cross groove formed by welding both ends of the tubular metal strip to form a tube. [Detailed description of the examples] This paper size applies Chinese national standards (CNS) specifications (2 丨 OX 297 mm) (please read the precautions on the back before filling this page) Printed by the cooperative A7 B7 V. Description of the invention (5) The cross section of the heat transfer tube system forming a cross-section metal tube according to the present invention has a certain spiral angle α to the longitudinal axis of the tube throughout the inner peripheral surface, There are many spiral grooves (1) that are formed parallel to each other. The cross-sectional shape of the spiral grooves (1) is generally inverted trapezoidal as shown in Fig. 3. In addition, the above-mentioned cross grooves form a heat transfer tube. ) In addition to crossing at a certain angle, there are many auxiliary grooves (2) formed in parallel with each other. The cross-sectional shape of the auxiliary groove (2) has a larger spiral angle than that of the spiral shape as shown in FIG. A right-angled triangle. The spiral grooves (1) and the auxiliary grooves (2) are formed on the inner peripheral surface of the tube with a plurality of ladder-shaped fine protrusions (3). The material of the heat transfer tube is copper, copper alloy, aluminum and aluminum alloy. Etc., using common materials, The width and thickness of the fabricated metal strip can be selected according to the application. The spiral groove (1) is formed as shown in Figure 5 after the auxiliary groove (2) is first formed, but the cross-sectional shape is as usual. The cross-groove heat transfer tube is almost triangular or ladder-shaped, and the spiral angle α of the spiral groove (1) of the longitudinal axis of the tube, that is, the angle of the flow direction of the refrigerant fluid is 1 D ° ~ 4 0 °, preferably 18 ° ~ 25 ° Q If the inclination angle of the spiral groove is smaller than 40 °, it is difficult to expect the turbulent flow effect caused by the spiral groove. In addition, the effect of turbulent flow of the refrigerant fluid is reduced and heat transfer is reduced. The performance is not good. On the contrary, if the spiral angle α is larger than 4 [T, the pressure loss increases due to the sharp increase in the fluid resistance of the spiral groove. Also, the pitch P between the spiral grooves is 0.2 to 0. 7 mm is better. If the pitch P of the groove is too large, the formation density of the spiral groove is small, which will reduce the application of the Chinese National Standard (CNS) Λ4 specification (210 > < 297 mm>) from this paper scale. (Please read the notes on the back before filling out this page)

Printed by the Consumer Cooperative of the Central Standards Bureau of the Ministry of Economic Affairs, 1T A7 _ ~-_B7_ι _ V. Description of the Invention (6) The effect of improving the fluidity of the refrigerant fluid and the heat transfer performance caused by the spiral groove. On the contrary, if the pitch of the groove is too small, it is difficult to form the groove. Therefore, a general heat transfer tube with an inner diameter of 1 cm inside and outside should be selected to use an appropriate value in the range of 0.2 to 0.7 mm. In addition, the ratio (H f / Di) of the depth (H f) of the spiral groove (1) of the inner diameter D i of the tube is preferably in the range of Q.Q2 to Q.Q5. If the depth ratio of the spiral groove to the inner diameter of the tube is Q.D 2 or less, it is difficult to expect the surface tension and turbulent flow effects due to the spiral groove because the effect of the spiral groove is not available. Conversely, if the (H f / D i) ratio is greater than or equal to 0.05, the fluid resistance due to the spiral groove becomes large, which reduces the fluidity. According to the present invention, since the continuous spiral groove can not only prevent the expansion of the refrigerant fluid, but also to improve the turbulent flow and stirring effect of the refrigerant fluid from the spiral groove, the secondary groove (2) and the spiral groove ( 1) In a state of crossing, a majority is formed in parallel with each other. The intersection angle β 傺 of the spiral groove (1) and the auxiliary groove (2) is preferably in the range of 75 ° to 1Q5 ° as shown in the second drawing, and it is more preferable to form a right angle with each other. In particular, the axial direction of the auxiliary groove (2) 傺 the spiral groove, the inclination angle of the spiral groove (1J upstream side front (2 ') 7 ft) to the downstream side back surface (2) tilt angle Ύ 2 is more With reference to Figure 4, the inclination angle 7 of the front (2,) on the upstream side is almost at right angles to the spiral groove direction of the heat transfer tube, that is, it belongs to the range of 90 ° to 105 °. The inclination angle of the back (2 ") 7 2” is better in the range of 30 ° ~ 60 °. According to this structure, the refrigerant fluid has a very large inclination angle ~ 8-This paper size applies Chinese national standards (CNS) Α4 specification (210 × 297 mm) (Please read the precautions on the back before filling out this page) 'Packing and Binding V. Invention Description (7 A7 B7 Front side of the travel side (2 1) results in a noticeable result from the pioneer f Turbulent flow and agitation. In addition, since the inclination angle y 2 of the downstream side back surface (2 ") is relaxed, as described later, when the refrigerant fluid flows over the protrusion (3), it will be caused along the downstream side back surface (2). It moves gently, so there is no eddy current on the downstream side (2 "). The present invention can minimize the pressure loss of the previous cross-groove heat transfer tube problem. Moreover, referring to FIG. 4, for the upper section of the protruding portion (3) of the width B of the upper section opening of the auxiliary groove (2) The ratio of the width A of the surface (A / B) is preferably in the range of 0.2 to 1.0. If the ratio of A / B is 0.2 or less, that is, if the width A of the upper surface of the protrusion (3) is too small, the auxiliary surface is formed. When the groove (2) is to be processed in a spiral groove, the front surface (2 ') of the protruding portion will be inclined to the upstream side. Therefore, the inclination angle of the auxiliary groove is difficult to be processed to the desired angle. On the contrary, if the A / B ratio is When it is 1.0 or more, that is, when the width A of the upper surface of the protruding portion is too large, the liquid film will expand to the upper surface of the protruding portion and reduce the coagulation performance. The depth of the spiral groove. The degree H f is the same as the depth of the auxiliary groove. When the auxiliary groove is deeper than the spiral groove, the turbulent flow effect of the spiral groove and the surface tension inside the groove will adversely affect the fluidity. P P, the auxiliary groove must be deep (please read the precautions on the back first) (Fill in this page again)

The 1T consumer stamping system of the Central Bureau of Standards of the Ministry of Economic Affairs has a deeper than the spiral groove depth (H / H fg 1.0 depth is too shallow than the depth of the spiral groove, the shape of the tube is not too high due to the heat transfer performance. Osu-shaped spiral grooves are more than 1/2 of the depth (H / H f will be described below in accordance with the present invention to form a cross groove heat transfer 5 drawing. According to the present invention to form a cross) 0 fcb difference, and if the secondary groove is-spiral-like For this reason, at least • 5) 0 The manufacturing method of the tube is the same as the manufacturing method of the heat transfer tube in Section 1 and the manufacturing method of the pseudo and general electric welding type heat transfer tube. There is no special paper standard applicable to Chinese national standards. (CNS) Λ4 specification (2 丨 〇X 297 mm) Printed by the Consumer Standards Cooperative of the Central Bureau of Standards of the Ministry of Economic Affairs A7 B7 V. Description of the invention (8) Different (Refer to Japanese Public Publication No. 9-9-2 3 4 0 1 4h However, the method according to the present invention is characterized in that a spiral groove is formed after the auxiliary groove is first formed. This pseudo-common cross groove forms a heat transfer tube manufacturing method, that is, if the spiral groove is first formed, To form a side ditch At this time, when the auxiliary groove is processed, a protruding portion is formed inside the spiral groove, which can effectively prevent adverse effects on the fluidity of the refrigerant fluid. According to the manufacturing method of the present invention, first, a heat transfer suitable for manufacturing a predetermined diameter will be provided. The metal strip (5) of tube length is formed by the auxiliary groove (6) through the auxiliary groove, and the auxiliary groove (2) is formed by the auxiliary groove (2), and then by the spiral groove (7). ) To form a spiral groove (1). On each of the rollers (6, 7), protrusions corresponding to the shape of each groove are formed at an angle. As described above, the auxiliary groove has a substantially right-angled triangular shape, so it is being formed. In the case of a spiral groove, the metal flow from the press-in portion is almost dependent on the protrusion (3) forming a ladder shape. Even if the protrusion protrudes to the side of the auxiliary groove to a certain extent, the effect of improving the fluidity due to the spiral groove is not reduced. The sharp protrusions that protrude from the side of the auxiliary groove can effectively prevent the diffusion of the cooling fluid and improve the condensation performance. Furthermore, the metal strip that ends the formation of the auxiliary groove and the spiral groove faces the inside of the surface where the groove is formed, and passes After forming the stage or multi-stage forming roller (8) into a tube with a predetermined diameter, the two ends of the metal strip are welded by high frequency welding such as induction wire coil (9) to form a tube. Thereafter, if necessary, the welding is formed. The outer peripheral surface of the tube is shaped into a true circle by a shaper wheel (10). Thereafter, the completed cross-groove forming tube is wound into a spiral shape, or it is cut to a predetermined length to complete the cross-groove forming tube. -10- This paper size applies the Chinese National Standard (CNS) A4 specification (210'〆297 mm) (please read the precautions on the back before filling out this page). ··· π Central Bureau of Standards, Ministry of Economic Affairs Printed by the employee consumer cooperative 'A7 -_ ^ _ B7__ V. Description of the invention (9) If the heat transfer tube of the cross groove is formed according to the present invention constructed as described above, the auxiliary groove is formed at a predetermined angle for the spiral groove, so From the previous continuous spiral groove along the spiral groove, most of the fluid throughout the inner surface of the heat transfer tube is widely diffused, so that the metal surface and the refrigerant fluid will not be in direct contact, which can inhibit the resulting condensation efficiency from decreasing. In addition, as described above, the side walls of the auxiliary groove are almost right-angled to the spiral groove, and the other side wall is formed at an inclined wall at an angle. Therefore, the refrigerant fluid flowing along the inclined wall can smoothly flow, and the generation of eddy currents on the downstream surface of the downstream side of the protrusion is suppressed, which can prevent the increase in flow resistance and the poor heat transfer performance caused by the eddy currents. In addition, since the vertical wall pseudo can maximize the turbulent flow and agitation of the refrigerant fluid, the heat transfer performance can be improved. In addition, the width of the lower portion of the protruding portion located between the auxiliary groove and the auxiliary groove is wide. Therefore, if the pipe is expanded by using a heat transfer tube, the possibility of damage to the groove or the protruding portion is reduced. After that, after the auxiliary groove is processed first, the spiral groove is processed, and protrusions are formed on the inside of the spiral groove to effectively prevent adverse effects on the fluidity of the refrigerant fluid. In addition, the sharp protrusions protruding from the side of the sub-ditch can effectively prevent the diffusion of the fluid and help improve the evaporation performance. Figures 6 to 8 show examples of experimental results applied to confirm the effect of the cross groove heat transfer tube according to the present invention. The cross groove of the present invention having an inner diameter of 9.5 2 in. Evaporation / condensation heat transfer performance and pressure loss of heat transfer tubes are compared with spiral grooved heat transfer tubes and cross grooved heat transfer tubes with the same inner diameter as previously without grooves (smooth tubes). Spiral grooved snails of the cross groove heat transfer tube of the present invention used in the experiment -1 1-(Please read the precautions on the back before filling out this page) Binding. Order • 1) ^ This paper size applies to Chinese National Standards (CNS) Specification A4 (210X297 mm) Printed by the Consumer Cooperatives of the Central Standards Bureau of the Ministry of Economic Affairs A7 B7 V. Description of the invention () The rotation angle α is 18 °, and the cross angle of the spiral groove of the auxiliary groove is 90 °

, The pitch P of the spiral groove is 0.24 min, the depth ratio (H f / D i) of the spiral groove to the inner diameter of the pipe is 0 · D 2 5, and the ratio of the secondary groove depth to the groove depth U / H f) is 0 · 8, the vertical wall inclination angle y 1 of the auxiliary groove is 9 G °, the inclination angle of the inclined wall 72 is 3 G. °, and for the protrusion B of the width B of the upper opening of the auxiliary groove (3 The ratio (A / B) of the width A of the upper plane is 0.5. A double-tube type heat exchanger was manufactured using the above-mentioned heat transfer tubes, and the refrigerant R 2 2 was flowed into the tube to measure the performance of each coil. From the experimental results of the heat transfer performance of Figures 6 and 7, it can be seen that if the cross-channel heat transfer tube according to the present invention is used, the heat transfer performance of the pseudo-cross-channel heat transfer tube is almost the same, which is improved to a smooth tube. It is about 3 times that of the spiral grooved pipe, and 1.5 times or more, especially the condensation performance is significantly improved compared with the previous cross grooved heat transfer pipe. In addition, the experimental results of the pressure loss inside the tube in Fig. 8 are clear. Although the heat transfer performance will be improved, the pressure loss inside the tube is similar to the previous spiral groove heat transfer tube, and it is better than the previous cross groove heat transfer tube. Significantly reduced. From the above description, it is clear that when the cross-groove heat transfer pipe and the manufacturing method thereof according to the present invention do not increase the pressure loss inside the pipe, the heat transfer performance such as evaporation performance and condensation performance can be greatly improved. . Therefore, the performance of heat exchangers such as condensers, evaporators, and heating tubes can be improved, which not only saves energy, but also achieves the effects of miniaturization, weight reduction, and cost savings of heat exchangers. -1 2-This paper size is in accordance with China National Standard (CNS) A4. (210X297 mm) -1 Λ- / —.---- 1, --ρί y —------ order --- --- ^, ί ..:. '., (Please read the notes on the back before filling this page)

[Brief Description of the Drawings] FIG. 1 is an enlarged oblique drawing showing a cross groove '′ 形成 forming an inner surface of a heat transfer tube according to the present invention. Fig. 2 (i) shows a plan view of the heat transfer tube in Fig. 1. Fig. 3 僳 A cross-sectional view taken along line I-H [of Fig. 2 to show the cross-sectional shape of the spiral groove. Fig. 4 is a cross-sectional view taken along line IV-IV of Fig. 2 for the purpose of showing the shape of the auxiliary groove. Fig. 5 (a) schematically shows a manufacturing method for forming a heat transfer tube in the inner groove according to the present invention. Figures 6 to 8 show the evaporation heat transfer performance, condensation heat transfer performance, and pressure of the heat transfer tube and the previous heat transfer tube according to a good embodiment of the present invention (please read the precautions on the back before filling this page) Table of loss of printing power of employees 'cooperatives in the Intellectual Property Bureau of the Ministry of Economic Affairs. Figure 9 shows the cross-ditch formation of heat transfer tubes-' Example No. 1-which is 9A. Figure, Figure 9B is a plan view, and Figure 9C is a section 圔 cut along the line AA of 9B 圔. Description of main component symbols: 1, 11 spiral groove 2, 12 sub-groove 2, upstream side > 1- 刖 face 2 '' downstream side back surface 3, 13 protrusion 5 metal strip 6, 7, 8 stick wheel 9 Induction coil 10 Stick wheel 14 Projection This paper size is applicable to China National Standard (CNS) A4 specification (210X297 mm)

Claims (1)

386049 Repairing hand A8 B8-Ministry · 1 !. Supplement C8 D8 Printed by the Consumer Cooperatives of the Central Standards Bureau of the Ministry of Economic Affairs. 6. Patent application scope No. 86112935 "Heat transfer tube forming cross trench and its manufacturing method" Patent case (amended in November 88) The scope of the patent application 1. A heat transfer tube forming a cross groove, and the inner surface of the tube-shaped gold body of the rat-shaped cross section. The spiral grooves at the angle of rotation form a majority in parallel to each other, and the secondary grooves crossing the spiral grooves at a certain degree to form a majority, the special emblem is: For the spiral angle of the spiral grooves of the longitudinal axis of the tube ( -«) Injury 10 ° ~ 40 °, for the above-mentioned spiral groove's sub-groove crossing angle (call) 傺 7 5 e ~ 1 0 5. The auxiliary groove wound has a vertical wall that is almost at right angles to the spiral groove of the pipe, an inclined wall that is inclined at an angle to the spiral groove of the pipe, and a protrusion of the width (B) of the upper opening of the auxiliary groove. The width U) ratio U / B) of the upper f / surface is 0, 2 to 1,0. 2. For example, the heat transfer tube forming a cross groove in the scope of the patent application, wherein the inclination angle (7 1) of the vertical wall and the inclination angle (7 2) of the inclined wall become 90 ° for the spiral groove of each tube. ~ 105. And .30 \ ~ 60 ° 〇3. If the cross-section, grooved heat transfer tube is formed in the first scope of the patent application, it is ... ¢. For the above-mentioned spiral groove depth (Hf) and the secondary groove depth (H) The ratio (H / Hf) is 0.5 to 1 · 0. -1- The size of wood paper is applicable to Chinese National Standard (CNS) ΑΊ specifications (210X297 cm) (Please read the precautions on the back before filling this page) 386049 Repairing hand A8 B8-Ministry · 1 !. Supplement C8 D8 Printed by the Consumer Cooperatives of the Central Standards Bureau of the Ministry of Economic Affairs. 6. Patent application scope No. 86112935 "Heat transfer tube forming cross trench and its manufacturing method" Patent case (amended in November 88) The scope of the patent application 1. A heat transfer tube forming a cross groove, and the inner surface of the tube-shaped gold body of the rat-shaped cross section. The spiral grooves at the angle of rotation form a majority in parallel to each other, and the secondary grooves crossing the spiral grooves at a certain degree to form a majority, the special emblem is: For the spiral angle of the spiral grooves of the longitudinal axis of the tube ( -«) Injury 10 ° ~ 40 °, for the above-mentioned spiral groove's sub-groove crossing angle (call) 傺 7 5 e ~ 1 0 5. The auxiliary groove wound has a vertical wall that is almost at right angles to the spiral groove of the pipe, an inclined wall that is inclined at an angle to the spiral groove of the pipe, and a protrusion of the width (B) of the upper opening of the auxiliary groove. The width U) ratio U / B) of the upper f / surface is 0, 2 to 1,0. 2. For example, the heat transfer tube forming a cross groove in the scope of the patent application, wherein the inclination angle (7 1) of the vertical wall and the inclination angle (7 2) of the inclined wall become 90 ° for the spiral groove of each tube. ~ 105. And .30 \ ~ 60 ° 〇3. If the cross-section, grooved heat transfer tube is formed in the first scope of the patent application, it is ... ¢. For the above-mentioned spiral groove depth (Hf) and the secondary groove depth (H) The ratio (H / Hf) is 0.5 to 1 · 0. -1- The size of wood paper is applicable to Chinese National Standard (CNS) ΑΊ specifications (210X297 cm) (Please read the precautions on the back before filling this page) A8 B8 C8 D8 Printed by the Consumer Cooperatives of the Central Standards Bureau of the Ministry of Economic Affairs 386049 6. Application for patent scope 4, such as the heat transfer tube forming a cross groove in the patent application item 1, where the spiral of the spiral groove of the longitudinal axis of the pipe is spiral The angle is 18 ° ~ 25 °, and the cross angle of the secondary groove of the spiral groove is 90 ° p 5. A method for manufacturing a heat transfer tube forming a cross groove, which covers the entire inner peripheral surface of a metal pipe with a circular cross section. Triangles or reversed ladder-shaped spiral grooves with a predetermined spiral angle in the longitudinal direction of the tube are formed in parallel. Λ 'For spiral grooves, they intersect at a predetermined angle to form a research. Those who have a larger spiral angle on the agricultural side, The pending sign includes: V, a metal-strip with a specified width „forming_secondary groove name stage; for a metal strip formed with the above-mentioned secondary grooves, a stage of forming a spiral groove;; forming the above-mentioned secondary grooves and snails. The spiral groove of the gold hurdle is formed into a groove-shaped surface, and is formed into a stage with a predetermined diameter and a lack of tube shape in a state facing inward; and 丨 welded and formed into both ends of the metal strip in the shape of the tube. 6. If the heat transfer tube forming a cross groove as described in item 5 of the scope of patent application, a manufacturing method, wherein for the spiral groove of the longitudinal axis of the tube, the spiral angle (α) is 10 ° ~ 40 °, It is preferably 18 ° ~ 251, _ For the above-the cross angle of the auxiliary groove of the snail-green groove (/ 3 __) is 7 5 '~ 1 0 5. It is preferably 90. 7. As the fifth item in the scope of patent application The heat transfer tube forming the cross groove .. manufacturing method, wherein the auxiliary groove has a right angle to the spiral groove of the tube -2- This paper size applies the Chinese National Standard (CNS) A4 specification (210X 297 mm) (Please read the notes on the back before filling this page) 386049 A8 B8 C8 D8 gas, patent application scope of the vertical wall and the above-mentioned tube spiral groove inclined to a certain angle. Sloped wall, the above-mentioned vertical wall inclination angle (.7 1) and inclined wall inclination angle (7 2) Spiral cold for each tube is 90. ~ 105 ° and 30. ～ —60 ° 〇 (Please read the precautions on the back before filling out this page)-Binding · Threading Private paper printed by the Consumer Standards Cooperative of the Central Standards Bureau of the Ministry of Economic Affairs applies Chinese National Standard (CNS) A4 (210X297 mm) )