A double-channel titanium pump body and its welding preparation process

Abstract

The present invention discloses a dual-channel titanium pump body and a welding preparation process thereof, wherein the dual-channel titanium pump body comprises: a pump body main body, a pump body mouth ring, a first slag cleaning hole, a gap control component and a flow channel partition; wherein, a flow channel partition is provided in the flow channel cavity of the pump body main body, the flow channel partition and the pump body main body are cast as one body, the pump body mouth ring is inlaid on the pump body main body, the pump body main body is provided with the first slag cleaning hole, the gap control component is installed inside the pump body main body, the slag cleaning hole is sealed by welding, and if problems are found during the welding process, it can be repaired in time, a wear-resistant layer is added to the pump body mouth ring, and the wear resistance of the pump body mouth ring is improved, titanium-nickel-molybdenum alloy is welded on the inlet and outlet flange sealing surfaces to improve its corrosion resistance, the support leg assembly is welded to the pump body main body with the help of a transition plate to reduce the preparation cost, and the gap control component is provided to solve the problems of flow reduction and blockage.

Description

Technical Field

[0001] The present invention relates to the field of fluid machinery, and in particular to a double-channel titanium pump body and a welding preparation process thereof. Background Art

[0002] The volute type double-channel pump is equipped with a flow channel partition in the pump body to balance the stability of the pump body during the flow of the medium. The volute type double-channel pump has good non-clogging and anti-winding properties and is easy to balance. Its efficiency is high. Therefore, its wear resistance and passability are better than those of the single-channel pump in applications where large particles of solids are transported. It is a solid-liquid two-phase pump with good performance.

[0003] During the casting process, a long slag cleaning hole for cleaning model residues is reserved on the volute-type double-flow channel pump body. After the residue is cleaned, the slag cleaning hole needs to be sealed with a plugging plate. The plugging plates used in the prior art are all the same thickness as the pump body wall. The plugging plates are first fixed to the slag cleaning hole and then welded to the pump body. This welding method for sealing the slag cleaning hole has a major problem. If it is found that the weld is not fully penetrated, it cannot be repaired from the inner cavity. The welds at the defective part can only be polished and removed. Due to limited space, repair is difficult. There is often a phenomenon that the root of the weld is not fully penetrated and is difficult to eradicate, affecting the safe operation of the pump body. In the prior art, the support legs are cast integrally with the pump body. Titanium is expensive. First, it causes material waste. Second, the cross-section of the connection between the support legs and the pump body is suddenly changed. The cooling rate is different during the casting process, which is prone to defects such as looseness and shrinkage.

[0004] During use, the area where the inner cavity of the pump body fits with the impeller is prone to wear, and a pump body mouth ring made of the same material as the pump body is usually installed. The pump body and pump body mouth ring made of pure titanium have low hardness and poor wear resistance, which leads to a high replacement frequency. The inlet and outlet flange sealing surfaces of conventional pure titanium pump bodies are prone to crevice corrosion in environments with high temperature, low pH chloride or weak reducing acid media, resulting in seal failure. Since volute-type double-channel pumps are usually used to transport media containing large solid particles, the gap between the tongue and the impeller needs to be set to an appropriate size. In the existing technology, this gap is either too large or too small. A gap that is too large reduces the flow rate, and a gap that is too small causes blockage.

[0005] Therefore, a dual-channel titanium pump body and a welding preparation process thereof are needed to solve the above technical problems. Summary of the Invention

[0006] To achieve the above objectives, in a first aspect, the present invention provides a dual-channel titanium pump body, comprising: a pump body main body, a pump body mouth ring, a first slag cleaning hole, a gap control component, and a channel partition;

[0007] Among them, a flow channel partition is provided in the flow channel cavity of the pump body, the flow channel partition is cast as one piece with the pump body, the pump body mouth ring is inlaid on the pump body, the first slag cleaning hole is opened on the pump body, and the gap control component is installed on the pump body.

[0008] Furthermore, as a preferred embodiment, the double-channel titanium pump body further comprises: a leg assembly, a second slag cleaning hole, an outlet flange and an inlet flange;

[0009] The side of the pump body is an inlet flange, the upper side is an outlet flange, the pump body is further provided with the second slag cleaning hole, and the lower end of the pump body is provided with the support leg assembly.

[0010] Further, as a preference, the gap control assembly comprises: a concave arc portion, a gear 1, a gear 2, a spacer tongue and a convex arc portion;

[0011] The pump body is provided with a concave arc portion, a base shell is installed on the outside of the pump body, a gear transmission group is provided in the base shell, and the gear transmission group is composed of the gear 1 and the gear 2 meshing with each other;

[0012] One end of the gear 1 shaft is connected to the power part fixed in the base shell, and the other end is rotatably connected to the pump body near the concave arc portion. One end of the gear 2 shaft is rotatably connected to the inner wall of the base shell, and the other end is fixedly connected to the partition tongue. The end of the partition tongue close to the gear 2 is a convex arc portion.

[0013] Furthermore, as a preference, a turning track is installed in the concave arc portion, and a locking track is provided on the convex arc portion, and the locking track can be rotatably locked into the turning track.

[0014] Furthermore, as a preference, the gap control assembly further comprises: a compensation member;

[0015] The compensating member is rotatably connected to the partition tongue and a torsion spring is provided at the rotating position. The compensating member is provided with a compensating end at one end close to the concave arc portion, and a suction portion is provided on the inner arc surface of the concave arc portion close to the compensating end.

[0016] There is a magnetic attraction relationship between the compensation end and the attraction portion.

[0017] Furthermore, preferably, a first blocking plate is provided in the first slag cleaning hole, and the first blocking plate blocks the first slag cleaning hole by welding; a second blocking plate is provided in the second slag cleaning hole, and the second blocking plate blocks the second slag cleaning hole in the same manner as above.

[0018] Furthermore, preferably, the inner hole of the pump body mouth ring is provided with a wear-resistant layer.

[0019] Furthermore, preferably, a first sealing portion is provided on the outlet flange, and a second sealing portion is provided on the inlet flange.

[0020] Further, preferably, the leg assembly includes: a first leg, a second leg, a first transition plate and a second transition plate;

[0021] Wherein, the upper ends of the first support leg and the second support leg are connected to the lower end of the pump body through the first transition plate and the second transition plate respectively.

[0022] In a second aspect, the present invention provides a dual-channel titanium pump body welding preparation process, comprising:

[0023] The first slag cleaning hole and the second slag cleaning hole are plugged and welded: titanium plates with a thickness less than the wall thickness of the pump body are prepared as two blocking plates, and welding grooves are required to be provided around the two blocking plates. When the two blocking plates are assembled with the pump body, the inner wall misalignment is controlled to be less than 1mm, and a gap of 2mm to 3mm is left between the two blocking plates and the pump body. The bottom welding between the two blocking plates and the pump body is performed. After the bottom welding is qualified, the filling welding and the cover welding are performed to complete the complete plugging welding operation of the slag cleaning holes on the pump body;

[0024] Welding of the pump body mouth ring: The pump body mouth ring is provided at the matching position between the inlet end of the pump body main body and the impeller. The inner hole of the pump body mouth ring is provided with a wear-resistant layer. The wear-resistant layer is a TiN ceramic layer with a thickness of 0.3mm to 0.5mm. The wear-resistant layer is metallurgically bonded to the base of the pump body mouth ring. A gap of 0.03mm to 0.1mm is left between the outer circle of the pump body mouth ring and the pump body main body. The pump body mouth ring and the pump body main body are spot-welded;

[0025] Welding of the sealing surfaces of the inlet flange and the outlet flange: two sealing parts are welded on the inlet flange and the outlet flange respectively by surfacing welding;

[0026] The support leg assembly is prepared by welding: the first support leg and the second support leg are respectively welded to the pump body through the first transition plate and the second transition plate, and are welded to the pump body into one body.

[0027] Compared with the prior art, the present invention provides a dual-channel titanium pump body and a welding preparation process thereof, which has the following beneficial effects:

[0028] Advantage 1: The present invention adopts a blocking welding method for the slag cleaning hole. If any problem is found during the welding process, it can be repaired in time, and the repair difficulty is small. There will be no phenomenon of incomplete welding defects that are difficult to eliminate, and it will not affect the safe operation of the pump body.

[0029] Advantage 2: The present invention adds a TiN ceramic layer as a wear-resistant layer to the pump body mouth ring, which can improve the wear resistance of the pump body mouth ring and reduce the replacement frequency of the pump body mouth ring.

[0030] Advantage three: The present invention welds titanium-nickel-molybdenum alloy on the sealing surfaces of the inlet and outlet flanges, which can improve their corrosion resistance and extend their service life.

[0031] Advantage 4: The present invention uses titanium-stainless steel composite plates as transition plates to help weld the support leg assembly to the pump body. The support leg material is changed from pure titanium to stainless steel, which greatly reduces the preparation cost. There are no support legs on the pump body during casting, avoiding casting defects of the pump body caused by sudden changes in cross-section.

[0032] Advantage 5: The present invention sets a gap control component to dynamically adjust the gap between the partition tongue and the impeller. It dynamically switches between the initial state and the working state to cleverly solve the problems of flow reduction and blockage during the working process of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] Figure 1 A schematic diagram of a double-channel titanium pump body and its welding preparation process structure Figure 1 ;

[0034] Figure 2 A schematic diagram of a double-channel titanium pump body and its welding preparation process structure Figure 2 ;

[0035] Figure 3 This is a diagram showing the initial state of a dual-channel titanium pump body and its welding preparation process gap control component;

[0036] Figure 4 This is a working state diagram of a dual-channel titanium pump body and its welding preparation process and gap control component;

[0037] Figure 5 A double-channel titanium pump body and its welding preparation process for plugging and cleaning slag holes. Figure 1 ;

[0038] Figure 6 A double-channel titanium pump body and its welding preparation process for plugging and cleaning slag holes. Figure 2 ;

[0039] Figure 7 A schematic diagram of a double-channel titanium pump body and its welding preparation process, including the pump body mouth ring welding;

[0040] Figure 8 A schematic diagram of the welding of a dual-channel titanium pump body and its welding preparation process, showing the leg assembly;

[0041] In the figure: 1. Pump body; 2. Pump body mouth ring; 21. Wear-resistant layer; 22. Spot welding; 3. Support leg assembly; 31. First support leg; 32. First transition plate; 321. Titanium clad layer; 322. Stainless steel base layer; 323. Argon arc welding weld one; 324. Argon arc welding weld two; 4. First slag cleaning hole; 41. First blocking plate; 42. Welding groove; 43. Bottom weld; 44. Filling weld; 45. Cover weld; 5. Second slag cleaning hole; 6. Gap control assembly; 61. Concave arc portion; 62. Rotating channel; 63. Gear one; 64. Gear two; 65. Spacing tongue; 66. Card channel; 67. Compensation part; 68. Torsion spring; 69. Compensation end; 610. Suction part; 7. Flow channel partition; 8. Outlet flange; 81. First sealing part; 9. Inlet flange; 91. Second sealing part. DETAILED DESCRIPTION

[0042] See also Figures 1-8 The present invention provides a double-channel titanium pump body and its welding preparation process, comprising: a pump body main body 1, a pump body mouth ring 2, a first slag cleaning hole 4, a gap control component 6 and a channel partition 7;

[0043] Among them, a flow channel partition 7 is provided in the flow channel cavity of the pump body 1, and the flow channel partition 7 is cast as one piece with the pump body 1. The pump body mouth ring 2 is inlaid on the pump body 1, and the first slag cleaning hole 4 is opened on the pump body 1. The gap control component 6 is installed on the pump body 1.

[0044] Furthermore, the double-channel titanium pump body further comprises: a leg assembly 3, a second slag cleaning hole 5, an outlet flange 8 and an inlet flange 9;

[0045] The side of the pump body 1 is an inlet flange 9, the upper side is an outlet flange 8, the pump body 1 is further provided with the second slag cleaning hole 5, and the lower end of the pump body 1 is provided with the support leg assembly 3.

[0046] In this embodiment, when the pump body 1 made of TA2 is cast, the first slag cleaning hole 4 and the second slag cleaning hole 5 on the pump body 1 are also cast together. After the residue is cleaned, the pump body 1 is sandblasted, and then the four surfaces of the two slag cleaning holes are polished until the metallic luster is exposed. A visual inspection is performed on the four polished surfaces to ensure that there are no defects such as pores, cracks, and missing meat. This can indicate that the preparatory work before the two slag cleaning holes are completed before welding is completed.

[0047] Furthermore, the gap control assembly 6 includes: a concave arc portion 61, a gear 1 63, a gear 2 64, a spacer tongue 65 and a convex arc portion;

[0048] The pump body 1 is provided with a concave arc portion 61, and a base shell is installed on the outside of the pump body 1. A gear transmission group is provided in the base shell, and the gear transmission group is composed of the gear 1 63 and the gear 2 64 meshing with each other;

[0049] One end of the gear 1 63 rotating shaft is connected to the power part fixed in the base shell, and the other end is rotatably connected to the position of the pump body 1 near the concave arc portion 61. One end of the gear 2 64 rotating shaft is rotatably connected to the inner wall of the base shell, and the other end is fixedly connected to the partition tongue 65. The end of the partition tongue 65 close to the gear 2 64 is a convex arc portion.

[0050] Furthermore, a turning track 62 is installed in the concave arc portion 61 , and a locking track 66 is provided on the convex arc portion. The locking track 66 can be rotatably locked into the turning track 62 .

[0051] As a preferred embodiment, please refer to Figure 3 、 Figure 4 As shown, the gap between the tongue 65 and the impeller in this device is adjustable, as shown in FIG. Figure 3 The tongue 65 is in the initial state. When the device is blocked (i.e. the gap between the tongue 65 and the impeller is small, as shown in FIG. Figure 3 As shown in the middle distance a), the power unit is started, and the power unit drives the gear 1 63 to rotate (the direction is as shown in the figure). Figure 3 As shown by the left arrow in the figure), the gear 2 64 is driven to rotate through the meshing relationship (the direction is as shown in the figure). Figure 3 As shown by the arrow on the right side of the figure), the gear 2 64 drives the tongue 65 to swing upward slightly with its output shaft to enter the working state, and the gap between it and the impeller is adjusted to be larger (as shown in the figure). Figure 4 As shown in the middle distance b, b>a), the clogging phenomenon of the device during use is effectively solved.

[0052] It should be noted that after the blockage is resolved, the gap between the tongue 65 and the impeller is larger (e.g. Figure 4 As shown in the middle distance b), if the fluidity of the subsequent device is abnormal (flow rate decreases), the power unit drives the gear 1 63 to rotate in the opposite direction to restore the tongue 65 to its initial position, effectively solving the problem of flow rate reduction.

[0053] The tongue 65 in the device can be dynamically switched between the initial state and the working state according to specific circumstances during the use of the device, cleverly avoiding the problems of blockage and flow reduction.

[0054] It should be noted that the power unit is located on the inner wall of the base shell. The power unit can be configured as a micro motor and needs to be leak-proof to prevent malfunction during operation and unnecessary trouble. The connection between the two gear shafts and the pump body 1 is dynamically sealed to prevent medium leakage. This dynamic seal can refer to existing technology and use an appropriate mechanical seal device.

[0055] Furthermore, the gap control assembly 6 further includes: a compensation member 67;

[0056] The compensating member 67 is rotatably connected to the tongue 65 and a torsion spring 68 is provided at the rotating position. The compensating member 67 is provided with a compensating end 69 at one end close to the concave arc portion 61. The concave arc portion 61 is provided with a suction portion 610 on the inner arc surface of the side close to the compensating end 69.

[0057] There is a magnetic attraction relationship between the compensating end 69 and the attracting portion 610 .

[0058] As a preferred embodiment, please refer to Figure 4 As shown, after the tongue 65 swings slightly upward, a space prone to accumulation will appear between the convex arc portion and the concave arc portion 61. To prevent accumulation from occurring here, the device is provided with a compensating member 67 to avoid this situation.

[0059] Specifically, after the tongue 65 swings, the attraction portion 610 on the inner arc surface of the concave arc portion 61 is exposed. Leveraging its inherent properties, it magnetically attracts the compensating end 69 at the end of the compensating member 67, causing the compensating member 67 to swing upward, shielding the space prone to accumulation and preventing accumulation. When the tongue 65 returns to its initial position, the compensating member 67, having lost its magnetic attraction, returns to its original position under the action of the torsion spring 68.

[0060] It should be noted that the compensation end 69 can be a permanent magnet, whose own magnetic pole is the S pole, and the attraction part 610 itself has the N pole. The two can achieve magnetic attraction, and the strength of the magnetic attraction is adapted to the torque of the torsion spring 68. The medium in the device will not interfere with the magnetic attraction.

[0061] Furthermore, a first blocking plate 41 is provided in the first slag cleaning hole 4, and the first blocking plate 41 blocks the first slag cleaning hole 4 by welding. A second blocking plate is provided in the second slag cleaning hole 5, and the second blocking plate blocks the second slag cleaning hole 5 in the same manner as above.

[0062] In this embodiment, the welding process for plugging the first slag cleaning hole 4 and the second slag cleaning hole 5 is mainly described:

[0063] See also Figure 5 、 Figure 6As shown, the two blocking plates (only the first blocking plate 41 is shown in the figure) are made of pure titanium plate TA2 with a thickness of 5mm. After passing the radiographic inspection, they are processed by wire cutting into Figure 5 The shape is obtained by processing the inner sides of the two blocking plates into an arc consistent with the pump body 1, and processing the welding groove 42 on the four edges. The welding groove 42 is 20°, and then preparing for blocking welding (taking the first blocking plate 41 blocking the first slag cleaning hole 4 as an example).

[0064] 1. Place the first blocking plate 41 into the first slag removal hole 4, adjust the inner side of the first blocking plate 41 to be flush with the inner wall of the pump body 1, and leave a gap of 2 to 3 mm evenly distributed around it (such as Figure 6 After the middle distance (as shown in c, d, e, and f), point consolidation is carried out.

[0065] 2. After the first blocking plate 41 and the first slag cleaning hole 4 are spot-fixed, use an endoscope to check whether the bottom of the first blocking plate 41 is flush with the inner wall of the pump body 1. If the misalignment is greater than 1mm, grind and remove the spot-fixed weld, re-assemble, and re-spot-fix.

[0066] 3. Before performing the root weld 43, seal all ports of the pump body 1 and introduce argon gas into the inner cavity for protection to prevent oxidation of the root weld. After completing the root weld 43, use an endoscope to inspect the back of the first blocking plate 41 for full penetration (with a weld excess of 0mm to 3mm, no pits, and no weld bumps greater than 3mm). If not, grind and remove the weld, and repeat the root weld 43. Endoscopic inspection confirms that the back of the root weld is of acceptable appearance quality with no "incomplete penetration" defects, and then proceed to the filler weld 44.

[0067] 4. After confirming that the appearance quality of the filling weld is qualified, perform cover welding 45 in a multi-pass welding manner, with a weld excess height of 0mm to 3mm and each side being 2mm to 3mm wider than the groove edge.

[0068] 5. After welding is completed, grind the weld surface to form a smooth transition with the pump body 1.

[0069] This type of welding method can promptly detect problems such as incomplete penetration during the welding process and can promptly perform rework and repair. The repair is easy and there will be no incomplete penetration defects that are difficult to eliminate, which will not affect the safe operation of the pump body 1.

[0070] It should be noted that if the pump body 1 is subjected to radiographic inspection, the welding portion of the first slag cleaning hole 4 should also be subjected to radiographic inspection to ensure that there are no defects exceeding the standard.

[0071] Furthermore, the inner hole of the pump body mouth ring 2 is provided with a wear-resistant layer 21 .

[0072] In this embodiment, the welding process of the pump body mouth ring 2 is mainly described:

[0073] See also Figure 7 As shown, the pump body ring 2 is welded to the medium inlet end of the pump body main body 1. The inner hole of the pump body ring 2 is laser-clad with a wear-resistant layer 21. The wear-resistant layer 21 is a TiN ceramic layer with a coating thickness of 0.3mm to 0.5mm. After laser cladding, it is subjected to stress relief heat treatment and then the coating surface is ground to ensure the required inner diameter of the pump body ring 2. The outer diameter of the pump body ring 2 is turned to ensure that the clearance between the outer diameter of the pump body ring 2 and the pump body 1 is 0.03mm to 0.1mm.

[0074] It should be noted that the preparation of TiN ceramic layer uses ultra-high-speed laser cladding technology with a spot diameter of less than 1mm and a laser energy density of 3KW / cm 2 The cladding layer and the substrate are metallurgically bonded, and there are no defects such as cracks and pores on the surface of the cladding layer.

[0075] After the pump body mouth ring 2 is machined to the final size, it is inserted into the pump body 1. Then, three spot welds 22 are performed on the end of the pump body mouth ring 2. The three spot welds are evenly spaced at 120 degrees, and each weld is 10mm to 15mm long. The welding method is argon arc welding, and the welding wire is φ1.6mm ERTi-2.

[0076] After the wear-resistant layer 21 is added, the wear resistance of the pump body mouth ring 2 is improved, the service life is increased, and the replacement frequency is reduced.

[0077] Furthermore, a first sealing portion 81 is provided on the outlet flange 8 , and a second sealing portion 91 is provided on the inlet flange 9 .

[0078] This embodiment mainly describes the sealing surface welding process of the inlet flange 9 and the outlet flange 8:

[0079] See also Figure 2 As shown, the two sealing surfaces on the inlet flange 9 and the outlet flange 8 of the pump body 1 are each welded with two sealing portions. Both sealing portions are made of a titanium-nickel-molybdenum alloy to improve crevice corrosion resistance. The weld layer thickness is ≥ 3 mm. Tungsten inert gas arc welding (TIGW) can be used for cladding, as can plasma welding, vacuum electron beam welding, laser cladding, and other methods. In this embodiment, TIG W is used for cladding. The cladding wire used is ERTi-12, φ2.4 mm.

[0080] It's important to note that during cladding, an argon hood should be placed at the end of the welding torch to protect weld areas exceeding 300°C to prevent oxidation and deterioration. During cladding, maintain an interpass temperature below 100°C. Perform two cladding layers, ensuring a thickness of 5mm or greater, and maintain an interpass temperature below 100°C. Alternately cladding the inlet flange 9 and the outlet flange 8 to prevent rapid temperature increases in the same area.

[0081] The corrosion resistance of the inlet and outlet flanges after surfacing with titanium-nickel-molybdenum alloy is enhanced, and their service life is significantly increased.

[0082] After the slag hole plugging welding of the pump body 1 is completed and the inlet and outlet flange sealing surfaces are also welded, the pump body 1 should be subjected to stress relief annealing. The stress relief annealing treatment is carried out in a vacuum furnace, and the ultimate vacuum pressure of the vacuum furnace should not be greater than 6.7×10 -3 Pa, the cold pressure rise rate should be no greater than 0.67Pa / h. Heat to 580±14°C. After soaking and holding, cool the pump body to below 200°C before removal from the furnace. Rough-turn the sealing surfaces of the inlet flange 9 and outlet flange 8 to a weld overlay thickness of ≥2mm, then perform a liquid penetrant test on the sealing surfaces.

[0083] Furthermore, the leg assembly 3 includes: a first leg 31, a second leg, a first transition plate 32 and a second transition plate;

[0084] The upper ends of the first support leg 31 and the second support leg are connected to the lower end of the pump body 1 through the first transition plate 32 and the second transition plate respectively.

[0085] This embodiment mainly describes the welding preparation process of the leg assembly 3:

[0086] See also Figure 8 As shown (taking the first leg 31 as an example),

[0087] After marking the position of the first leg 31 on the bottom of the pump body 1, the titanium cladding 321 of the first transition plate 32 is first spot-fastened to the pump body 1. The titanium cladding 321 and the pump body 1 are then welded together, forming argon arc weld 1 323. The welding wire is 2.4 mm ERTi-2. During the welding process, the inside of the pump body 1 corresponding to the first transition plate 32 is continuously protected with an argon hood to prevent oxidation caused by heating. After the titanium cladding 321 of the first transition plate 32 is welded to the pump body 1, the stainless steel base layer 322 of the first transition plate 32 is welded to the first leg 31, forming argon arc weld 2 324. The welding wire is 2.4 mm ER308.

[0088] The welding preparation method of this type of support leg assembly 3 not only reduces the manufacturing cost, but also solves the welding problem between the support legs and the pump body 1. There are no support legs when casting the pump body 1, which avoids the occurrence of defects such as looseness and shrinkage holes caused by sudden changes in cross-section.

[0089] After the first leg 31 is welded, check the parallelism between the bottom surface of the first leg 31 and the horizontal axis of the pump body 1 and the end surface of the outlet flange 8. If the parallelism does not meet the requirements, use a boring machine to trim the bottom surface of the first leg 31 with the horizontal axis of the pump body 1 as the reference.

[0090] Furthermore, the welding process and preparation process of each component are as follows:

[0091] It should be noted that the following is only a rough outline of the welding process of the present invention, and the specific detailed welding process has been introduced above.

[0092] The first slag cleaning hole 4 and the second slag cleaning hole 5 are sealed and welded: titanium plates with a thickness less than the wall thickness of the pump body 1 are prepared as two blocking plates, and welding grooves 42 are required to be provided around the two blocking plates. When the two blocking plates are assembled with the pump body 1, the inner wall misalignment must be controlled to be less than 1mm, and a gap of 2mm to 3mm is left between the two blocking plates and the pump body 1. A bottom welding 43 is performed between the two blocking plates and the pump body 1. After the bottom welding 43 is qualified, a filling welding 44 and a cover welding 45 are performed to complete the complete sealing welding operation of the slag cleaning holes on the pump body 1.

[0093] Welding of the pump body mouth ring 2: the pump body mouth ring 2 is provided at the matching position between the inlet end of the pump body main body 1 and the impeller, and the inner hole of the pump body mouth ring 2 is provided with a wear-resistant layer 21, and the wear-resistant layer 21 is a TiN ceramic layer with a thickness of 0.3mm to 0.5mm. The wear-resistant layer 21 is metallurgically bonded to the base of the pump body mouth ring 2, and a gap of 0.03mm to 0.1mm is left between the outer circle of the pump body mouth ring 2 and the pump body main body 1. Spot welding 22 is performed between the pump body mouth ring 2 and the pump body main body 1.

[0094] Sealing surface welding of the inlet flange 9 and the outlet flange 8: Two sealing parts are welded on the inlet flange 9 and the outlet flange 8 respectively by surfacing welding.

[0095] The support leg assembly 3 is prepared by welding: the first support leg 31 and the second support leg are welded to the pump body 1 through the first transition plate 32 and the second transition plate respectively, and are welded to the pump body 1 as a whole.

[0096] During specific implementation, the slag cleaning holes are sealed and welded during the casting process of the device, the sealing parts are welded on the sealing surfaces of the inlet and outlet flanges to improve their corrosion resistance, a wear-resistant layer 21 is added to the pump body mouth ring 2 to improve its wear resistance and extend its service life, and the welding of the support leg assembly 3 is achieved with the help of a transition plate to reduce manufacturing costs and avoid defects. During the use of the device, the dynamic adjustment of the partition tongue 65 can be used to deal with problems caused by reduced flow or blockage.

[0097] The above is only a preferred specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any technician familiar with this technical field, within the technical scope disclosed by the present invention, who makes equivalent replacements or changes based on the technical solutions and inventive concepts of the present invention, should be covered by the scope of protection of the present invention.

Claims

1. A dual-channel titanium pump body, characterized by: include: A pump body (1), a pump body mouth ring (2), a first slag cleaning hole (4), a gap control component (6), and a flow channel partition (7); Wherein, a flow channel partition (7) is provided in the flow channel cavity of the pump body (1), the flow channel partition (7) and the pump body (1) are cast as one body, the pump body mouth ring (2) is embedded in the pump body (1), the first slag cleaning hole (4) is opened on the pump body (1), and the gap control component (6) is installed on the pump body (1); The gap control assembly (6) comprises: a concave arc portion (61), a gear 1 (63), a gear 2 (64), a spacer tongue (65) and a convex arc portion; The pump body (1) is provided with a concave arc portion (61), the pump body (1) is provided with a base shell on the outside, the base shell is provided with a gear transmission group, and the gear transmission group is composed of the gear 1 (63) and the gear 2 (64) meshing with each other; One end of the rotating shaft of the gear 1 (63) is connected to the power part fixed in the base shell, and the other end is rotatably connected to the position of the pump body (1) near the concave arc portion (61). One end of the rotating shaft of the gear 2 (64) is rotatably connected to the inner wall of the base shell, and the other end is fixedly connected to the partition tongue (65). The end of the partition tongue (65) near the gear 2 (64) is a convex arc portion. A turning track (62) is installed in the concave arc portion (61), and a locking track (66) is provided on the convex arc portion. The locking track (66) can be rotatably locked into the turning track (62); The gap control assembly (6) further includes: a compensation member (67); The compensating member (67) is rotatably connected to the partition tongue (65) and a torsion spring (68) is provided at the rotating portion. A compensating end (69) is provided at one end of the compensating member (67) close to the concave arc portion (61). An attraction portion (610) is provided on an inner arc surface of one side of the concave arc portion (61) close to the compensating end (69). There is a magnetic attraction relationship between the compensating end (69) and the attracting portion (610).

2. A dual-channel titanium pump body according to claim 1, characterized in that: Also includes: A support leg assembly (3), a second slag cleaning hole (5), an outlet flange (8), and an inlet flange (9); The side of the pump body (1) is an inlet flange (9), the upper side is an outlet flange (8), the pump body (1) is further provided with a second slag cleaning hole (5), and the lower end of the pump body (1) is provided with the support leg assembly (3).

3. A dual-channel titanium pump body according to claim 2, characterized in that: A first blocking plate (41) is provided in the first slag cleaning hole (4), and the first blocking plate (41) blocks the first slag cleaning hole (4) by welding. A second blocking plate is provided in the second slag cleaning hole (5), and the second blocking plate blocks the second slag cleaning hole (5) in the same manner as described above.

4. A dual-channel titanium pump body according to claim 1, characterized in that: The inner hole of the pump body mouth ring (2) is provided with a wear-resistant layer (21).

5. The dual-channel titanium pump body according to claim 2, characterized in that: The outlet flange (8) is provided with a first sealing portion (81), and the inlet flange (9) is provided with a second sealing portion (91).

6. A dual-channel titanium pump body according to claim 2, characterized in that: The leg assembly (3) comprises: a first leg (31), a second leg, a first transition plate (32), and a second transition plate; The upper ends of the first support leg (31) and the second support leg are connected to the lower end of the pump body (1) via the first transition plate (32) and the second transition plate, respectively.

7. A dual-channel titanium pump body welding preparation process according to claim 6, characterized in that: include: The first slag cleaning hole (4) and the second slag cleaning hole (5) are sealed by welding: titanium plates with a thickness less than the wall thickness of the pump body (1) are prepared as two blocking plates, and welding grooves (42) are required to be provided around the two blocking plates. When the two blocking plates are assembled with the pump body (1), the inner wall misalignment is controlled to be less than 1 mm, and a gap of 2 mm to 3 mm is left between the two blocking plates and the pump body (1). The bottom welding (43) between the two blocking plates and the pump body (1) is performed. After the bottom welding (43) is qualified, the filling welding (44) and the cover welding (45) are performed, thereby completing the complete sealing welding operation of the slag cleaning holes on the pump body (1); Welding of the pump body mouth ring (2): the pump body mouth ring (2) is provided at the portion where the inlet end of the pump body main body (1) and the impeller cooperate, the inner hole of the pump body mouth ring (2) is provided with a wear-resistant layer (21), the wear-resistant layer (21) is a TiN ceramic layer with a thickness of 0.3 mm to 0.5 mm, the wear-resistant layer (21) and the base of the pump body mouth ring (2) are metallurgically bonded, a gap of 0.03 mm to 0.1 mm is left between the outer circle of the pump body mouth ring (2) and the pump body main body (1), and spot welding (22) is performed between the pump body mouth ring (2) and the pump body main body (1); Welding the sealing surfaces of the inlet flange (9) and the outlet flange (8): two sealing portions are welded to the inlet flange (9) and the outlet flange (8) respectively by surfacing welding; The support leg assembly (3) is prepared by welding: the first support leg (31) and the second support leg are welded to the pump body (1) via the first transition plate (32) and the second transition plate respectively, and are welded to the pump body (1) as a whole.

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