A welding bushing for a twin-screw pump and its manufacturing process

Abstract

The present invention discloses a welding bushing for a twin-screw pump and a manufacturing process, which relates to the technical field of a twin-screw pump, can reduce the cost required for manufacturing, and provides a manufacturing process for the bushing, which is used to quickly manufacture the welding bushing for the twin-screw pump. The bushing includes two total sleeves welded by a first sleeve and a second sleeve, and end plates arranged at both ends of the two total sleeves. The total sleeve has a conveying cavity for passing a twin screw. The two total sleeves are coaxially welded through a first connecting portion, and the two end plates are respectively welded to the respective adjacent total sleeves through a second connecting portion; the outer sides of the two total sleeves are respectively sleeved and welded with connecting plates. All components of the present invention are connected by welding, and can be obtained by cutting suitable steel plates and steel pipes. It is convenient to obtain materials, and can be manufactured for twin-screw pumps of different specifications, which reduces the expenditure on molds and has less possibility of defects.

Description

Technical Field

[0001] The invention relates to the technical field of twin-screw pumps, and in particular to a welding bushing for a twin-screw pump and a manufacturing process thereof. Background Art

[0002] The twin-screw pump is a positive displacement pump widely used in petrochemical, construction, environmental protection, papermaking, metallurgy and other fields. Due to its structural characteristics, it can transport a wide range of media. During the application process, the power device drives the screw to rotate, generating pressure in the pump, thereby transporting fluid.

[0003] At present, twin-screw bushings are mostly manufactured by integral casting, which requires the manufacture of corresponding molds. Therefore, when the number of bushings required is small, the setting of the mold increases the cost. At the same time, due to the existence of casting defects, the casting structure is prone to be not dense enough, and there are defects such as shrinkage holes, pores, slag inclusions, cracks, uneven grain size, low mechanical properties of castings, and low impact resistance during the production process. Summary of the invention

[0004] The technical problem to be solved by the present invention is to provide a welding bushing for a twin-screw pump, which can reduce the cost required for manufacturing, and provide a manufacturing process for the welding bushing for a twin-screw pump, which is used to quickly manufacture the welding bushing for a twin-screw pump. The present invention provides a welding bushing for a twin-screw pump and a manufacturing process that solves the above problems.

[0005] The present invention is achieved through the following technical solutions:

[0006] A welding bushing for a twin-screw pump, comprising two main sleeves, the main sleeve comprising a first sleeve and a second sleeve, the cross-section of the first sleeve and the second sleeve being in a major arc shape, the openings of the first sleeve and the second sleeve being close to each other and welded to form a conveying cavity for inserting a twin-screw;

[0007] The two main sleeves are coaxially welded through the first connecting portion to form an outlet portion, and the outlet portion is provided with an outlet gap for outputting fluid;

[0008] The two main sleeves are provided with end plates at the sides away from each other, and the end plates are provided with end plate through holes adapted to the delivery cavity. The two end plates are respectively welded to the respective adjacent main sleeves through the second connecting parts to form inlet parts located on both sides of the outlet part, and the inlet parts are provided with inlet gaps for inputting fluid;

[0009] The outer sides of the two main casings are respectively sleeved and welded with connecting plates, and the connecting plates are used to isolate the outlet and the inlet outside the main casing in the pump.

[0010] In this scheme, the major arc refers to an arc on a circle that is larger than a semicircle. The first sleeve and the second sleeve with a major arc cross-section are welded to each other to form an 8-shaped through hole in the middle position. The through hole is recorded as a conveying cavity. In addition, the coaxiality of the two total sleeves refers to the corresponding coincidence of the axes of the first sleeve and the second sleeve in the two total sleeves, and the axes of the first sleeve and the second sleeve are preset as the connecting line of the centers of their arc surfaces. The twin-screw pump is provided with an internal space for placing the bushing, and the bushing can be placed in the internal space, wherein the end plate and the connecting plate of the bushing cooperate with the twin-screw pump to complete the fixation of the bushing, wherein the connecting plate divides the internal space into an intermediate chamber connected to the outlet gap and two side chambers arranged on both sides of the intermediate chamber and connected to the inlet gap, the outlet part is located in the intermediate chamber, and the inlet part is respectively located in the two side chambers; wherein the two total casings formed by the first casing and the second casing, the conveying cavity therein is used to pass through two mutually cooperating screw members, when the pumping operation is performed, the conveyed fluid enters the inlet gap in the pump from the inlet end of the pump, and is then driven to the outlet gap by the rotation of the two screw members and is output from the outlet end of the pump.

[0011] All the components of the twin-screw pump are connected by welding, wherein the first sleeve and the second sleeve can be obtained by cutting and surface finishing a suitable steel pipe, and the end plate and the connecting plate can be obtained by cutting a suitable steel plate. Compared with the original mold manufacturing, it is convenient to obtain materials, and can be manufactured for twin-screw pumps of different specifications, reducing the expenditure on molds; at the same time, the finished steel pipe and steel plate have a tight structure and fewer defects, and the bushing welded thereby is less likely to have defects than the bushing manufactured by the mold.

[0012] Preferably, the curvature of the cross-sectional shape of the first sleeve is slightly larger than that of the cross-sectional shape of the second sleeve, and one side edge of the opening side surfaces of the first sleeve close to the second sleeve and two side edges of the inner wall of the second sleeve close to the first sleeve are close to each other.

[0013] In this scheme, during the pumping operation, the screw pump rotates in the delivery chamber, and the delivered fluid is driven by the screw pump and moves between the two main sleeves. At this time, the working pressure in the delivery chamber is gradually increased along the fluid delivery direction by the screw pump, and the openings of the first sleeve and the second sleeve need to be welded. If the weld is exposed in the delivery chamber in a large range, the weld may be damaged and cracked due to the increased working pressure or the friction when the screw rotates, resulting in reduced integrity of the bushing. At the same time, the fluid may expand the crack under the action of pressure, causing the fluid to leak from the crack, and thus reducing the boosting delivery effect of the twin screw pump. By making the side edges of the opening of the first sleeve close to the second sleeve and the side edges of the inner wall of the second sleeve close to the first sleeve close to each other or fit together, the cavity wall of the delivery chamber is mainly composed of the first sleeve and the second sleeve, and only a weld leaked from the opening of the first sleeve and the inner wall of the second sleeve is exposed, thereby reducing the possibility of problems with the delivery chamber weld during pumping operations and improving the stability of bushing operation.

[0014] Further preferably, welding gaps are left between the side surfaces of the opening of the second sleeve and the outer wall of the first sleeve respectively, and sleeve connecting welds filling the welding gaps are provided in the welding gaps.

[0015] In this scheme, if the side surfaces on both sides of the opening of the second sleeve and the outer wall of the first sleeve are too close, it will be difficult to weld between the two. At this time, a gap connecting the conveying cavity will inevitably be formed between the two. When the pumping operation is performed, the conveyed fluid will enter the gap under pressure, and its pressure will also act on the side surfaces on both sides of the opening of the second sleeve and the outer wall of the first sleeve, which increases the strength requirement for welding. Therefore, welding gaps are reserved in advance between the side surfaces on both sides of the opening of the second sleeve and the outer wall of the first sleeve for setting the sleeve connection weld to fill the welding gap, avoid the formation of a gap connecting the conveying cavity, reduce the strength requirement of the bushing and the weld there, and enable the bushing to operate more stably.

[0016] Further preferably, the side surfaces of the opening of the first sleeve are arcuate surfaces, the radius of the arcuate surface is consistent with the radius of the inner wall of the second sleeve, and the axis of the arcuate surface overlaps with the axis of the second sleeve.

[0017] Since the radius of the side surface is consistent with the radius of the inner wall of the second sleeve, and the axis of the arc surface overlaps with the axis of the second sleeve, at this time, the side surface and the inner wall of the second sleeve can form a complete arc surface, which can cooperate with the screw to narrow the gap between the conveying cavity and the screw, and avoid the backflow of fluid between the side surface and the screw, thereby improving the conveying efficiency and pressurization effect of the pump.

[0018] Preferably, the first connecting portion includes two first ribs and two second ribs;

[0019] The two first ribs are both arranged between the two main sleeves, and the two main sleeves are spaced apart to form the outlet gap, and the two ends of one of the first ribs are respectively welded to the center positions of the opposite sides of the two first sleeves, and the two ends of the other first rib are respectively welded to the center positions of the opposite sides of the second sleeves;

[0020] The two second ribs are arranged between the connecting plates and the two ends thereof are respectively welded to the two connecting plates, and the sides of the two second ribs facing the main sleeve are respectively welded to the sleeve connecting welds located on both sides of the two main sleeves.

[0021] In this scheme: the two sides of the main sleeve are preset as the two sides of the main sleeve where the welding parts of the first sleeve and the second sleeve are provided. The first rib plate is arranged between the main sleeves, and is welded to the center positions of the opposite sides of the first sleeve and the opposite sides of the second sleeve respectively, to support and connect the two main sleeves, and to form an outlet gap, wherein the first sleeve is arranged at the center position, which can ensure the supporting effect of the first rib plate on the two main sleeves. In addition, the second rib plate is arranged between the two connecting plates, and is welded to the two connecting plates and the sleeve connecting weld at the same time. At this time, the first rib plate and the second rib plate are arranged in a square, which further strengthens the connection between the two main sleeves. At the same time, since the working pressure in the conveying chamber is gradually increased along the fluid conveying direction due to the action of the screw pump, the part of the total casing located between the connecting plates is subjected to greater pressure, and the strength requirement of the casing connection weld located there is also higher. For this reason, each second rib plate is welded to the two casing connection welds located on the same side of the total casing at the same time, and the casing connection weld at this location is further strengthened by the second rib plate and the weld connected to the casing connection weld at this location to adapt to the pressure changes in the conveying chamber.

[0022] Preferably, the second connecting portion includes two third ribs and two fourth ribs;

[0023] The third rib is arranged between the main sleeve and the adjacent end plate, and the main sleeve and the adjacent end plate are spaced to form the inlet gap, and two ends of one of the third ribs are respectively welded to the end plate and the center position of the first sleeve facing the end plate, and two ends of the other third rib are respectively welded to the end plate and the center position of the second sleeve facing the end plate;

[0024] The two fourth ribs are respectively arranged on both sides of the main sleeve, and two ends of the fourth rib are respectively welded to the end plate and the connecting plate.

[0025] In this solution, a second connection part is provided between the main sleeve and the adjacent end plates, and each second connection part includes two third ribs and two fourth ribs. The third ribs are provided between the main sleeve and the adjacent end plates, support and connect the main sleeve and the end plates, and form an outlet gap. The third sleeve is provided at the center position to ensure the support effect of the third ribs on the main sleeve and the end plates. In addition, fourth ribs are provided on both sides of the main sleeve. At this time, the third ribs and the fourth ribs are arranged in a square shape, which further strengthens the connection and support between the main sleeve and the end plates.

[0026] Preferably, an annular groove for installing a sealing ring is formed on the outer side of the connecting plate.

[0027] In this solution, an annular groove is provided on the outer side of the connecting plate. When installed in the pump, a sealing ring can be installed in the annular groove to strengthen the isolation effect of the connecting plate on the outlet and the inlet, thereby preventing the fluid to be output during the pumping process from flowing back into the side chamber through the gap between the connecting plate and the internal space of the pump, thereby improving the delivery efficiency and pressurization effect of the pump.

[0028] Further preferably, both end edges of the first rib plate, the second rib plate, the third rib plate and the fourth rib plate are provided with grooves for facilitating welding.

[0029] The groove is welded to make the connection between the weld there and the corresponding rib plate tighter and firmer, thereby improving the stability of the entire bushing.

[0030] A manufacturing process for a welding bushing for a twin-screw pump as described in the above scheme comprises the following steps:

[0031] Making the first casing, the second casing, the first rib plate and the third rib plate: selecting a suitable thick-walled steel pipe according to the specifications of the twin-screw pump, cutting and grinding the thick-walled steel pipe to form four first casings, two second casings, two first rib plates and four third rib plates;

[0032] Making the end plate, the connecting plate, the second rib plate and the fourth rib plate: selecting a suitable steel plate according to the specifications of the twin-screw pump, and cutting the steel plate into two second rib plates, four fourth rib plates, two end plates and two connecting plates;

[0033] Make the bushing: assemble and weld the two first sleeves with the two second sleeves to form two total sleeves, respectively sleeve the two connecting rods at corresponding positions on the outside of the total sleeves and weld them, weld and fix the first rib plate and the second rib plate between the connecting plates, and weld and fix the third rib plate and the fourth rib plate between the connecting plate and the end plate, so as to complete the bushing.

[0034] In this solution, the thick-walled steel pipe is a steel pipe with a ratio of the outer diameter of the steel pipe to the wall thickness of less than 20. The position and size of the end plate and the connecting plate are determined by the internal structure of the twin-screw pump, and the structure of the end plate through hole of the end plate and the conveying cavity of the total casing is determined by the size and position of the twin screws of the twin-screw pump. Therefore, the specifications of each component are determined based on the position and size of the end plate and the connecting plate and the structure of the end plate through hole of the end plate and the conveying cavity of the total casing. The first casing, the second casing, the first rib plate and the third rib plate are manufactured by cutting and grinding the matching thick-walled steel pipe, and the end plate, the connecting plate, the second rib plate and the fourth rib plate are manufactured by cutting the matching steel plate. Compared with the original mold manufacturing, it is convenient to obtain materials, and can be manufactured for twin-screw pumps of different specifications, reducing the mold expenditure; at the same time, the finished steel pipe and steel plate have a compact structure and fewer defects, and the bushing welded by this is less likely to have defects than the bushing manufactured by the mold.

[0035] Preferably, the cross-sectional shape of the end plate through hole of the end plate is consistent with the cross-sectional shape of the delivery cavity of the overall sleeve;

[0036] When manufacturing the bushing, a horizontally placed tooling shaft is inserted into the conveying cavity of the main sleeve body and the end plate through hole of the end plate, the main sleeve body and the end plate are suspended on the tooling shaft by gravity, and one of the first ribs and one of the third ribs are placed on the top of the tooling shaft, and the two ends of the first rib are respectively welded to the two main sleeve bodies, and the two ends of the third rib are respectively welded to the main sleeve body and the end plate;

[0037] The main sleeve and the end plate are rotated 180° around the tooling axis, another first rib plate and another third rib plate are placed on the top of the tooling axis, and the two ends of the first rib plate are respectively welded to the two main sleeves, and the two ends of the third rib plate are respectively welded to the main sleeve and the end plate.

[0038] In this solution, the tooling shaft is cylindrical, and its radius is slightly smaller than the radius of the major arc structure constituting the conveying cavity, so as to facilitate the tooling shaft to pass through the conveying cavity and the end plate through hole. Since the tooling shaft is placed horizontally, the end plate and the total sleeve thereon will fall under the influence of gravity. At this time, the center position of the first sleeve or the second sleeve is in contact with the top of the tooling shaft. At this time, the first rib plate and the third rib plate are placed on the top of the tooling shaft and welded to the total sleeve or the end plate. The coaxial connection of the end plate, the total sleeve, the first rib plate and the third rib plate can be realized simply and quickly, ensuring the reliability of the entire bushing.

[0039] The present invention has the following advantages and beneficial effects:

[0040] 1. A welding bushing for a twin-screw pump provided by an embodiment of the present invention has all its components connected by welding, wherein the first sleeve and the second sleeve can be obtained by cutting and finishing a suitable steel pipe, and the end plate and the connecting plate can be obtained by cutting a suitable steel plate. Compared with the original mold manufacturing, it is convenient to obtain materials, and can be manufactured for twin-screw pumps of different specifications, thus reducing the mold expenditure; at the same time, the finished steel pipe and steel plate have a compact structure and fewer defects, and the bushing welded therefrom is less likely to have defects than the bushing manufactured by the mold;

[0041] 2. A welding bushing for a twin-screw pump provided in an embodiment of the present invention makes the cavity wall of the delivery cavity mainly composed of the first sleeve body and the second sleeve body, and only exposes a weld, thereby reducing the possibility of problems with the delivery cavity weld during pumping operation and improving the stability of bushing operation; at the same time, by making the side surfaces of the opening of the first sleeve body match the inner wall radius of the second sleeve body, the gap between the delivery cavity and the screw is reduced, and the fluid is prevented from flowing back between the side surfaces and the screw, thereby improving the delivery efficiency and pressurization effect of the pump;

[0042] 3. A welding bushing for a twin-screw pump provided by an embodiment of the present invention is provided with a second rib plate between the connecting plates, and the second rib plate is simultaneously welded to two sleeve connecting welds located on the same side of the overall sleeve, and the sleeve connecting weld at that location is further strengthened by the second rib plate and the weld connected to the sleeve connecting weld at that location, so as to adapt to the pressure change in the delivery cavity;

[0043] 4. A manufacturing process for a welded bushing for a twin-screw pump provided in an embodiment of the present invention can simply and quickly realize the coaxial connection of the end plate, the overall sleeve, the first rib plate and the third rib plate through the setting of the tooling shaft, thereby ensuring the reliability of the entire bushing. BRIEF DESCRIPTION OF THE DRAWINGS

[0044] The drawings described herein are used to provide a further understanding of the embodiments of the present invention, constitute a part of this application, and do not constitute a limitation of the embodiments of the present invention. In the drawings:

[0045] Figure 1 The overall structure of Example 1 of the present invention;

[0046] Figure 2 It is a front view of embodiment 1 of the present invention;

[0047] Figure 3 for Figure 2 Sectional view at AA in the middle;

[0048] Figure 4 A side view of the first rib plate or the third rib plate in Embodiment 1 of the present invention;

[0049] Figure 5 for Figure 4 Cross-section at the middle BB;

[0050] Figure 6 A plate surface view of the second rib plate or the fourth rib plate in Embodiment 1 of the present invention;

[0051] Figure 7 for Figure 6 Sectional view at CC;

[0052] Figure 8 This is a diagram showing the matching of the bushing and the tooling shaft according to Example 1 of the present invention.

[0053] Marks and corresponding parts names in the attached drawings:

[0054] 1-main sleeve, 11-first sleeve, 12-second sleeve, 13-conveying cavity, 14-sleeve connecting weld, 21-first rib plate, 22-second rib plate, 23-exit gap, 31-third rib plate, 32-fourth rib plate, 33-inlet gap, 4-end plate, 41-end plate through hole, 5-connecting plate, 51-annular groove, 6-groove, 7-tooling shaft. DETAILED DESCRIPTION

[0055] In order to make the objectives, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with embodiments and drawings. The exemplary embodiments of the present invention and their description are only used to explain the present invention and are not intended to limit the present invention.

[0056] In the following description, a large number of specific details are set forth in order to provide a thorough understanding of the present invention. However, it is apparent to one of ordinary skill in the art that these specific details are not necessarily employed to practice the present invention. In other embodiments, in order to avoid obscuring the present invention, well-known structures, circuits, materials, or processes are not specifically described.

[0057] Throughout the specification, references to "one embodiment," "an embodiment," "an example," or "an example" mean that a particular feature, structure, or characteristic described in conjunction with the embodiment or example is included in at least one embodiment of the present invention. Therefore, the phrases "one embodiment," "an embodiment," "an example," or "an example" appearing in various places throughout the specification do not necessarily all refer to the same embodiment or example. In addition, particular features, structures, or characteristics may be combined in one or more embodiments or examples in any suitable combination and / or sub-combination. In addition, it will be appreciated by those of ordinary skill in the art that the figures provided herein are for illustrative purposes and that the figures are not necessarily drawn to scale. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0058] In the description of the present invention, the directions or positional relationships indicated by terms such as “front”, “rear”, “left”, “right”, “up”, “down”, “vertical”, “horizontal”, “high”, “low”, “inside” and “outside” are based on the directions or positional relationships shown in the accompanying drawings and are only for the convenience of describing the present invention and simplifying the description. They do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction. Therefore, they should not be understood as limiting the scope of protection of the present invention.

[0059] Embodiment 1:

[0060] like Figures 1 to 7 As shown, a welding bushing for a twin-screw pump includes two main sleeves 1, the main sleeve 1 includes a first sleeve 11 and a second sleeve 12, the cross-sectional shape of the first sleeve 11 and the second sleeve 12 is a major arc shape, the openings of the first sleeve 11 and the second sleeve 12 are close to each other and welded to form a conveying cavity 13 that can be used to penetrate the twin screws, so the cross-sectional shape of the main sleeve 1 and its conveying cavity 13 is roughly 8-shaped;

[0061] The two main casing bodies 1 are coaxially welded through the first connecting portion to form an outlet portion, and the outlet portion is provided with an outlet gap 23 for outputting fluid;

[0062] The two main casing bodies 1 are provided with end plates 4 at the sides away from each other, and the end plates 4 are provided with end plate through holes 41 adapted to the delivery chamber 13. The two end plates 4 are respectively welded to the respective adjacent main casing bodies 1 through the second connecting parts to form inlet parts located on both sides of the outlet part, and the inlet parts are provided with inlet gaps 33 for inputting fluid;

[0063] The outer sides of the two main casings 1 are respectively sleeved and welded with connecting plates 5 , and the connecting plates 5 are used to isolate the outlet and the inlet outside the main casing 1 in the pump.

[0064] The connecting plate 5 is provided with an 8-shaped hole for sleeve-mounting on the main sleeve 1. The size of the 8-shaped hole and the width of the outer wall of the main sleeve 1 are 2-3 mm, which is used for welding.

[0065] Wherein, the first connection portion includes two first ribs 21 and two second ribs 22;

[0066] The two first ribs 21 are both arranged between the two main sleeves 1, so that the two main sleeves 1 are spaced apart to form the outlet gap 23, wherein the two ends of one first rib 21 are respectively welded to the center positions of the opposite sides of the two first sleeves 11, and the two ends of the other first rib 21 are respectively welded to the center positions of the opposite sides of the second sleeve 12;

[0067] The two second ribs 22 are arranged between the connecting plates 5, and the two ends thereof are respectively welded to the two connecting plates 5, and the sides of the two second ribs 22 facing the overall sleeve body 1 are respectively welded to the sleeve body connecting welds 14 located on both sides of the two overall sleeve bodies 1.

[0068] The first rib plate 21 is preferably an arc-shaped plate adapted to the connected first sleeve 11 or second sleeve 12, and its cross-sectional shape is an inferior arc shape, which can be cut from a steel pipe of the same specification as the first sleeve 11 or the second sleeve 12. The second rib plate 22 is preferably a square steel plate with a thickness slightly smaller than the width of the sleeve connecting weld 14 exposed to the outside. At this time, the weld on the second rib plate 22 used to connect with the sleeve connecting weld 14 is also welded to the sleeve connecting weld 14 to strengthen the connection. The second rib plate 22 can be obtained by cutting from a suitable steel plate, which is convenient for obtaining materials.

[0069] Wherein, the second connection portion includes two third ribs 31 and two fourth ribs 32;

[0070] The third rib plate 31 is arranged between the main sleeve body 1 and the adjacent end plate 4, and the main sleeve body 1 and the adjacent end plate 4 are spaced to form the inlet gap 33, and two ends of one of the third rib plates 31 are respectively welded to the end plate 4 and the center position of the first sleeve body 11 facing the end plate 4, and two ends of the other third rib plate 31 are respectively welded to the end plate 4 and the center position of the second sleeve body 12 facing the end plate 4;

[0071] The two fourth ribs 32 are respectively arranged on both sides of the main casing 1 , and two ends of the fourth ribs 32 are respectively welded to the end plate 4 and the connecting plate 5 .

[0072] The third rib plate 31 is preferably an arc-shaped plate adapted to the connected first casing 11 or second casing 12, and its cross-sectional shape is an inferior arc shape, which can be cut from a steel pipe of the same specification as the first casing 11 or second casing 12. The fourth rib plate 32 is preferably a square steel plate, which can be obtained by cutting from a suitable steel plate, and it is convenient to obtain materials. In addition, the placement position of the fourth rib plate 32 is preferably closer to the edge of the end plate 4 or the connecting plate 5, and its plate surface faces the main casing 1. The plate surface and the outer side of the main casing 1 leave a channel for the fluid to pass through. At this time, the fluid entering from the inlet end of the pump can enter the delivery chamber 13 from various places of the inlet gap 33, thereby increasing the delivery efficiency of the pump.

[0073] For one or more embodiments, the curvature of the cross-sectional shape of the first sleeve 11 is slightly greater than the curvature of the cross-sectional shape of the second sleeve 12, and the side edges of the opening of the first sleeve 11 on both sides close to the second sleeve 12 and the side edges of the inner wall of the second sleeve 12 on both sides close to the first sleeve 11 are close to each other. In order to facilitate welding, welding gaps are left between the opening of the second sleeve 12 and the outer wall of the first sleeve 11, and the sleeve connecting welds 14 filling the welding gaps are provided in the welding gaps.

[0074] Among them, the side surfaces on both sides of the opening of the first sleeve 11 are arc-shaped surfaces, the radius of the arc-shaped surface is consistent with the radius of the inner wall of the second sleeve 12, and the axis of the arc-shaped surface overlaps with the axis of the second sleeve 12. At this time, the side surfaces cooperate with the inner wall of the second sleeve 12 to form an integral arc surface.

[0075] For one or more embodiments, an annular groove 51 for installing a sealing ring is formed on the outer side of the connecting plate 5 .

[0076] For one or more embodiments, in order to enhance the strength of welding, grooves 6 for facilitating welding are provided at both end edges of the first rib 21, the second rib 22, the third rib 31 and the fourth rib 32. The grooves 6 are used to increase the thickness of the weld and the contact area with the connecting parts, thereby making the connection between the weld and the corresponding rib tighter and more secure, thereby improving the stability of the entire bushing.

[0077] A manufacturing process for a welding bushing for a twin-screw pump as described in the above scheme comprises the following steps:

[0078] S1, manufacturing the first casing 11, the second casing 12, the first rib plate 21 and the third rib plate 31: selecting a suitable thick-walled steel pipe according to the specifications of the twin-screw pump, cutting and grinding the thick-walled steel pipe to form four first casings 11, two second casings 12, two first rib plates 21 and four third rib plates 31;

[0079] S2, manufacturing the end plate 4, the connecting plate 5, the second rib plate 22 and the fourth rib plate 32: selecting a suitable steel plate according to the specifications of the twin-screw pump, and cutting the steel plate into two second rib plates 22, four fourth rib plates 32, two end plates 4 and two connecting plates 5;

[0080] S3. Make the bushing: assemble and weld the two first sleeves 11 and the two second sleeves 12 to form two total sleeves 1, respectively sleeve the two connecting rods at corresponding positions on the outside of the total sleeve 1 and weld them, weld and fix the first ribs 21 and the second ribs 22 between the connecting plates 5, and weld and fix the third ribs 31 and the fourth ribs 32 between the connecting plate 5 and the end plate 4, so as to complete the bushing.

[0081] Among them, since the smoothness requirement of the conveying cavity 13 of the overall casing 1 is relatively high to avoid affecting the rotation of the screw, a 3-5mm finishing allowance is reserved in the selection of the wall thickness of the thick-walled steel pipe.

[0082] Among them, for one or more embodiments, the cross-sectional shape of the end plate through hole 41 of the end plate 4 can be made to be relatively consistent with the cross-sectional shape and size of the delivery cavity 13 of the overall casing 1.

[0083] like Figure 8 As shown, when manufacturing the bushing, a horizontally placed tooling shaft 7 is inserted into the conveying cavity 13 of the main sleeve body 1 and the end plate through hole 41 of the end plate 4, the main sleeve body 1 and the end plate 4 are suspended on the tooling shaft 7 by gravity, and the first rib plate 21 and the third rib plate 31 are placed on the top of the tooling shaft 7, and the two ends of the first rib plate 21 are respectively welded to the two main sleeve bodies 1, and the two ends of the third rib plate 31 are respectively welded to the main sleeve body 1 and the end plate 4;

[0084] The main sleeve body 1 and the end plate 4 are rotated 180° around the tooling axis 7, another first rib plate 21 and another third rib plate 31 are placed on the top of the tooling axis 7, and the two ends of the first rib plate 21 are respectively welded to the two main sleeve bodies 1, and the two ends of the third rib plate 31 are respectively welded to the main sleeve body 1 and the end plate 4.

[0085] The usage of this embodiment is:

[0086] The welding bushing for the twin-screw pump is placed in the internal space of the corresponding twin-screw pump, the end plate 4 and the connecting plate 5 of the bushing cooperate with the twin-screw pump to complete the fixation of the bushing, and the screw of the twin-screw pump passes through the conveying chamber 13 of the main sleeve 1. At this time, the connecting plate 5 divides the internal space into an intermediate chamber connected to the outlet gap 23 and two side chambers arranged on both sides of the intermediate chamber and connected to the inlet gap 33, the outlet part is located in the intermediate chamber, and the inlet part is respectively located in the two side chambers; when performing pumping operations, the conveyed fluid enters the inlet gap 33 in the pump from the inlet end of the pump, and is then driven to the outlet gap 23 by the rotation of the two screw members and output from the outlet end of the pump.

[0087] The specific implementation methods described above further illustrate the objectives, technical solutions and beneficial effects of the present invention in detail. It should be understood that the above description is only a specific implementation method of the present invention and is not intended to limit the scope of protection of the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A welding bushing for a twin-screw pump, It is characterized in that The invention comprises two main sleeves (1), wherein the main sleeves (1) comprise a first sleeve (11) and a second sleeve (12), wherein the cross-section of the first sleeve (11) and the second sleeve (12) is in the shape of a major arc, and the openings of the first sleeve (11) and the second sleeve (12) are close to each other and welded to form a conveying cavity (13) capable of being used to pass a twin screw; The two main sleeves (1) are coaxially welded through a first connecting portion to form an outlet portion, and the outlet portion is provided with an outlet gap (23) capable of being used to output fluid; An end plate (4) is provided on each side of the two main sleeve bodies (1) that are away from each other. The end plate (4) is provided with an end plate through hole (41) that is adapted to the delivery cavity (13). The two end plates (4) are respectively welded to the respective adjacent main sleeve bodies (1) via a second connecting portion to form an inlet portion located on both sides of the outlet portion. The inlet portion is provided with an inlet gap (33) that can be used to input a fluid. The outer sides of the two main casings (1) are respectively sleeved and welded with connecting plates (5), and the connecting plates (5) are used to isolate the outlet and the inlet outside the main casing (1) in the pump; The curvature of the cross-sectional shape of the first sleeve (11) is slightly greater than the curvature of the cross-sectional shape of the second sleeve (12); one side edge of the opening side surfaces of the first sleeve (11) close to the second sleeve (12) and two side edges of the inner wall of the second sleeve (12) close to the first sleeve (11) are close to each other; Welding gaps are respectively left between the side surfaces of the opening of the second sleeve (12) and the outer wall of the first sleeve (11), and sleeve connecting welds (14) are provided in the welding gaps to fill the welding gaps; The side surfaces of the opening of the first sleeve (11) are arc-shaped surfaces, the radius of the arc-shaped surface is consistent with the radius of the inner wall of the second sleeve (12), and the axis of the arc-shaped surface overlaps with the axis of the second sleeve (12); The first connection portion comprises two first rib plates (21) and two second rib plates (22); The two first ribs (21) are both arranged between the two main sleeves (1), and the two main sleeves (1) are spaced apart to form the outlet gap (23), and the two ends of one of the first ribs (21) are respectively welded to the center positions of the opposite sides of the two first sleeves (11), and the two ends of the other first ribs (21) are respectively welded to the center positions of the opposite sides of the second sleeve (12); The two second ribs (22) are arranged between the connecting plates (5) and their two ends are respectively welded to the two connecting plates (5); the sides of the two second ribs (22) facing the overall sleeve (1) are respectively welded to the sleeve connecting welds (14) located on both sides of the two overall sleeves (1); The outer side of the connecting plate (5) is provided with an annular groove (51) for mounting a sealing ring.

2. A welding bushing for a twin-screw pump according to claim 1, It is characterized in that The second connection portion comprises two third ribs (31) and two fourth ribs (32); The third rib plate (31) is arranged between the main sleeve (1) and the adjacent end plate (4), and the main sleeve (1) and the adjacent end plate (4) are spaced apart to form the inlet gap (33), and two ends of one of the third rib plates (31) are respectively welded to the end plate (4) and the center position of the first sleeve (11) on the side facing the end plate (4), and two ends of the other third rib plate (31) are respectively welded to the end plate (4) and the center position of the second sleeve (12) on the side facing the end plate (4); The two fourth ribs (32) are respectively arranged on both sides of the main sleeve (1), and the two ends of the fourth ribs (32) are respectively welded to the end plate (4) and the connecting plate (5).

3. A welding bushing for a twin-screw pump according to claim 2, It is characterized in that The first rib plate (21), the second rib plate (22), the third rib plate (31) and the fourth rib plate (32) are provided with grooves (6) at both end edges thereof for facilitating welding.

4. A manufacturing process for manufacturing a welding bushing for a twin-screw pump according to any one of claims 1 to 3, It is characterized in that Includes steps: Manufacturing a first casing (11), a second casing (12), a first rib plate (21), and a third rib plate (31): selecting a suitable thick-walled steel pipe according to the specifications of the twin-screw pump, cutting and grinding the thick-walled steel pipe to form two first casings (11), two second casings (12), two first rib plates (21), and four third rib plates (31); Manufacturing the end plate (4), the connecting plate (5), the second rib plate (22) and the fourth rib plate (32): selecting a suitable steel plate according to the specifications of the twin-screw pump, and cutting the steel plate to form two second rib plates (22), four fourth rib plates (32), two end plates (4) and two connecting plates (5); Manufacturing the bushing: the two first sleeves (11) are respectively welded to the two second sleeves (12) to form two total sleeves (1); the two connecting plates are respectively sleeved at corresponding positions on the outside of the total sleeve (1) and welded; the first rib plate (21) and the second rib plate (22) are welded and fixed between the connecting plates (5); the third rib plate (31) and the fourth rib plate (32) are welded and fixed between the connecting plate (5) and the end plate (4), thereby completing the bushing.

5. A manufacturing process for a welding bushing for a twin-screw pump according to claim 4, It is characterized in that The cross-sectional shape of the end plate through hole (41) of the end plate (4) is consistent with the cross-sectional shape of the delivery cavity (13) of the overall sleeve body (1); When manufacturing the bushing, a horizontally placed tooling shaft (7) is inserted into the conveying cavity (13) of the main sleeve body (1) and the end plate through hole (41) of the end plate (4); the main sleeve body (1) and the end plate (4) are suspended on the tooling shaft (7) by gravity; a first rib plate (21) and a third rib plate (31) are placed on the top of the tooling shaft (7); and the two ends of the first rib plate (21) are respectively welded to the two main sleeve bodies (1); and the two ends of the third rib plate (31) are respectively welded to the main sleeve body (1) and the end plate (4); The main sleeve body (1) and the end plate (4) are rotated 180 degrees around the tooling shaft (7), another first rib plate (21) and another third rib plate (31) are placed on top of the tooling shaft (7), and the two ends of the first rib plate (21) are respectively welded to the two main sleeve bodies (1), and the two ends of the third rib plate (31) are respectively welded to the main sleeve body (1) and the end plate (4).

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