Closed impeller

Abstract

The utility model relates to a closed impeller, which solves the problems that welding slag enters a flow channel, the welding is unreliable and the like in the prior art, and adopts the technical scheme that the closed impeller comprises a front cover plate, a rear cover plate and blades arranged between the front cover plate and the rear cover plate, and is characterized in that the blades and the front cover plate are of an integrated structure; a plurality of welding protrusions are arranged on the bottom wall of each blade and deviate from the front cover plate, a plurality of welding portions are arranged on the rear cover plate and correspond to the blades one to one, a plurality of welding grooves are formed in each welding portion at intervals, and the welding protrusions are inserted into the welding grooves in a one-to-one correspondence mode. The closed impeller has the beneficial effects that the overall strength of the rear cover plate is improved through the welding grooves formed at intervals, the situation that welding rods covering the bottom walls of the whole blades are broken is prevented through the welding protrusions arranged at intervals, and the welding protrusions can be smoothly inserted into the welding grooves and welded and fixed to form the stable and reliable closed impeller.

Description

TECHNICAL FIELD

[0001] The utility model relates to water pump part field especially relates to a closed type impeller. BACKGROUND

[0002] The closed type impeller is mostly applied in multistage pump, well pump and other equipment, and is often made of metal, plastic and other materials, wherein the blade in the impeller made of plastic material is fixed by welding with the back cover plate, and there are problems such as welding slag entering the flow channel and unreliable welding, which affect the qualified rate and performance of the impeller.

[0003] In order to solve the problem of welding slag entering the flow channel, a gap for guiding welding slag is arranged between the blade and the clamping groove, a whole welding rod is arranged on the blade along the trajectory of the blade, the impeller cover is provided with a clamping groove corresponding to the welding rod, and the welding rod is inserted into the clamping groove and welded and fixed. Although the welding slag generated by welding can be guided into the gap to prevent overflow from affecting welding and impeller quality, the impeller cover is thin and the surface is curved, and during welding, the problem of unstable positioning of the impeller cover easily causes the welding rod to break or the impeller cover to break, affecting the welding reliability, or causing the blade and the back cover plate to be scrapped, and affecting the production yield of the impeller. SUMMARY

[0004] The utility model aims at solving the above problems existing in the prior art and provides a closed type impeller, the welding groove arranged at intervals is beneficial to improving the overall strength of the back cover plate, the welding protrusions arranged at intervals are used for preventing the welding rod on the whole bottom wall of the blade from breaking, and are beneficial to the smooth insertion of the welding protrusions into the welding groove and the welding and fixing to form a stable and reliable closed type impeller.

[0005] The utility model discloses a technical scheme as follows: a closed impeller, comprising a front cover plate, a rear cover plate and blades arranged between the front cover plate and the rear cover plate, characterized in that the blades and the front cover plate are an integral structure, each blade bottom wall is provided with a plurality of spaced welding protrusions, the welding protrusions are arranged away from the front cover plate, the rear cover plate is provided with a plurality of welding positions, the welding positions and the blades are arranged one-to-one, each welding position is provided with a plurality of spaced welding grooves, and the welding protrusions are inserted into the welding grooves one-to-one for welding and fixation.

[0006] As a further improvement and supplement to the above technical scheme, the utility model adopts the following technical measures:

[0007] As a preferred embodiment, the part of the rear cover plate matched with the blades is a flat ring part, the welding positions are arranged on the flat ring part, the blade bottom wall provided with the welding protrusions is located on the same plane as the flat ring part, and the part of the front cover plate matched with the blades is a conical or circular arc platform shape extending axially away from the rear cover plate with a gradually decreasing radius. Since the front cover plate has a three-dimensional structure, the blades are integrally formed with the front cover plate, which facilitates injection molding and improves production efficiency, and improves the reliability and consistency of the blades and the front cover plate (i.e., the same batch or different batches can produce products with consistent specifications). The flat ring part of the rear cover plate is adapted to the plane where the blade bottom wall is located, which facilitates the insertion of the welding protrusions into the welding grooves and welding. After the welding, the blade bottom wall can be attached to the flat ring part on the rear cover plate, which not only ensures the stability and reliability of the insertion and welding process, but also ensures that the blade bottom wall can be completely attached to the flat ring part on the rear cover plate, avoiding gaps and leakage, and improving the working efficiency of the closed impeller.

[0008] As preferred, the welding protrusion is a protrusion protruding towards the back cover plate, and the interval distance between the adjacent welding protrusions on the same blade is 1mm-3mm. The interval distance between the adjacent welding protrusions on the same blade is limited, which is beneficial to the accurate insertion of the welding protrusion into the welding groove, prevents the breakage or non-insertion of the welding protrusion, and thus is beneficial to the improvement of the welding efficiency and the guarantee of the overall strength of the back cover plate.

[0009] As preferred, the height of the welding protrusion is h1, the thickness of the flat ring part is h2, and the thickness of the blade is H, and 1 / 5h2≤h1≤2 / 5h2 and 1 / 5H≤h1≤1 / 2H. This is beneficial to the guarantee of the sufficient molten material for the fixation of the blade and the back cover plate during the welding, the guarantee of the welding reliability, the guarantee of the strength of the flat ring part, and thus is beneficial to the improvement of the production yield, the production efficiency, and the production cost of the closed impeller.

[0010] As preferred, the side wall of the welding protrusion and the side wall of the welding groove are gap-fitted to form a welding slag accommodating space, and the height of the welding protrusion is greater than the depth of the welding groove. The welding slag accommodating space is formed between the welding protrusion and the welding groove, which is beneficial to the flow guidance and storage of the welding slag generated during the welding in the welding slag accommodating space, and thus is beneficial to the guarantee of the qualification rate and the performance of the closed impeller. The height of the welding protrusion is greater than the depth of the welding groove, which is beneficial to the improvement of the welding reliability and stability, and the guarantee of the welding quality, and thus is beneficial to the guarantee of the qualification rate and the performance of the closed impeller.

[0011] As preferred, the diameter of the circumscribed circle of the bottom wall of the blade is greater than the diameter of the outer edge of the back cover plate, the outer edge of the back cover plate is provided with an outwardly extending extension part, and the diameter of the circumscribed circle of the extension part is adapted to the diameter of the circumscribed circle of the bottom of the blade. In order to improve the hydraulic performance of the closed impeller, the radius of the outer edge of the back cover plate is smaller than the radius of the outer edge of the front cover plate, the outer end (i.e. the outer edge) of the blade extends to the outside of the outer edge of the back cover plate, and the extension part is beneficial to the stable fixation of the outer end of the blade, prevents the shaking of the closed impeller during the operation, and is beneficial to the guarantee of the flow performance of the closed impeller and the reduction of the working noise.

[0012] As preferred, the extension part is an outwardly extending part of the welding part, and the circumferential bending direction of the extension part and the circumferential bending direction of the welding part are both adapted to the bending direction of the blade. The outer end of the blade is fixed, and the flow channel length of the closed impeller is extended, which is beneficial to the improvement of the flow performance of the closed impeller.

[0013] As preferred, the extension part and the outer edge of the back cover plate have a reinforcing part therebetween, which is arranged away from the working surface of the blade, that is, the reinforcing part is arranged to bend the extension part to surround the area.

[0014] As preferred, the reinforcing part and the outer edge of the back cover plate and the extension part have a circular arc transition therebetween.

[0015] As preferred, the outer diameter of the front wall of the blade is greater than that of the bottom wall of the blade, the radius of the outer end of the blade gradually decreases from the front wall to the back wall, the back cover plate is integrally formed with a shaft sleeve, the middle part of the front cover plate is provided with a water inlet, the shaft sleeve is inserted through the water inlet from back to front, and the diameter of the water inlet is greater than the outer diameter of the shaft sleeve.

[0016] The utility model discloses have beneficial effect: 1, the welding groove of interval arrangement is favorable to improve the overall strength of back cover plate, and the welding projection of interval arrangement is used for preventing the fracture of the welding rod on the whole blade bottom wall, and the welding projection is favorably inserted into the welding groove and is welded and fixed to form the stable and reliable closed impeller. 2, the front cover plate is the space three -dimensional structure shape, adopts the scheme that the blade is integrally formed with the front cover plate, is convenient to injection mould integrally formed, is favorable to improve production and processing efficiency, can improve the cooperation reliability and consistency of blade and front cover plate. 3, the back cover plate has the plane adaptation of the bottom wall of the flat ring part and blade, after the welding projection is inserted into the welding groove and is welded, the bottom wall of the blade can be attached to the flat ring part on the back cover plate, is favorable to ensure that the plug-in, welding process is stable and reliable and is carried out smoothly, is favorable to ensure that the bottom wall of the blade can be attached to the flat ring part on the back cover plate completely, avoids the existence gap, avoids the leakage situation, is favorable to ensure the working efficiency of closed impeller. 4, to improve the hydraulic performance of closed impeller, the outer edge radius of back cover plate is less than the outer edge radius of front cover plate, and the outer end (that is, the outer edge) of blade extends to the outside of the outer edge of back cover plate, and the setting of extension part is favorable to stably fix the outer end of blade, prevents the shaking situation of closed impeller when working, is favorable to ensure the flow performance of closed impeller and reduce working noise. 5, the setting of reinforcing part is favorable to further improve the stability of fixing the outer end of blade, is further favorable to prevent the shaking situation of closed impeller when working, is favorable to further ensure the flow performance of closed impeller and reduce working noise. BRIEF DESCRIPTION OF DRAWINGS

[0017] Figure 1 It is a structural schematic diagram of the utility model.

[0018] Figure 2 is Figure 1 a sectional view structure schematic diagram.

[0019] Figure 3 is Figure 1 an explosion structure schematic diagram.

[0020] Figure 4 is a structure schematic diagram of the rear cover plate involved in the utility model.

[0021] Figure 5 is a sectional view structure schematic diagram of the rear cover plate involved in the utility model.

[0022] Figure 6 is Figure 1 a formal structure schematic diagram.

[0023] In the drawing: 1, front cover plate; 2, rear cover plate; 3, blade; 4, shaft sleeve; 5, water inlet; 6, water outlet; 7, welding protrusion; 8, welding groove; 9, flat plate ring part; 10, bottom wall; 11, front wall; 12, extension part; 13, reinforcing part; 14, working surface. DETAILED DESCRIPTION

[0024] The technical scheme of the utility model will be further specifically explained below by examples and in combination with the drawings.

[0025] Example: as shown in the drawing, a closed impeller comprises a front cover plate 1, a rear cover plate 2 and blades 3 arranged between the front cover plate 1 and the rear cover plate 2. Figures 1-6

[0026] The difference between the technical scheme and the prior art lies in that:

[0027] The blades 3 and the front cover plate 1 are an integral structure, each blade 3 is provided with a plurality of welding protrusions 7 arranged at intervals on the bottom wall 10, the welding protrusions 7 are arranged away from the front cover plate 1, the rear cover plate 2 is provided with a plurality of welding positions, the welding positions are arranged one by one corresponding to the blades 3, each welding position is provided with a plurality of welding grooves 8 arranged at intervals, and the welding protrusions 7 are inserted into the welding grooves 8 one by one and welded and fixed.

[0028] In the prior art, the welding protrusions 7 on each blade 3 are in a long strip structure, the length and shape of which are adapted to the length and shape of the blade 3, and in the process of inserting the welding protrusions 7 into the welding grooves 8, or when the blade 3 is subjected to external force, the blade 3 (or the front cover plate 1 and the blade 3 in an integral structure) is prone to breakage, which results in high scrap rate and further affects the production efficiency, product qualification rate and production cost of the closed impeller. ​

[0029] And, in the prior art, in order to adapt to the long strip structure of the welding protrusion 7, the welding groove 8 is also a long strip structure, the stress concentration is more serious, and the rear cover plate 2 is subjected to a smaller external force, and all will be broken along the welding groove 8, causing the rear cover plate 2 to be scrapped, thereby affecting the production efficiency, product qualification rate and production cost of the closed impeller.

[0030] However, in the technical scheme, a plurality of welding protrusions 7 are arranged on the bottom wall 10 of each blade 3, a plurality of welding positions corresponding to the blades 3 are arranged on the rear cover plate 2, and a plurality of welding grooves 8 are arranged at intervals on the welding positions, the welding protrusions 7 are inserted into the welding grooves 8 one by one and welded and fixed, the welding grooves 8 arranged at intervals are beneficial to improve the overall strength of the rear cover plate 2, and the welding protrusions 7 arranged at intervals are used to prevent the welding rod on the entire bottom wall 10 of the blade 3 from being broken, which is beneficial to the smooth insertion of the welding protrusions 7 into the welding grooves 8 and the welding and fixation to form a stable and reliable closed impeller.

[0031] Next, the above technical scheme will be expanded and described in detail:

[0032] In actual application, the diameter of the circumscribed circle of the front wall 11 of the blade 3 is greater than the diameter of the circumscribed circle of the bottom wall 10 of the blade 3, the radius of the outer end of the blade 3 gradually decreases from the front wall 11 to the rear wall, the rear cover plate 2 is integrally formed with a shaft sleeve 4, the middle part of the front cover plate 1 is provided with a water inlet 5, the shaft sleeve 4 is inserted into the water inlet 5 from the rear to the front, and the diameter of the water inlet 5 is greater than the outer diameter of the shaft sleeve 4. In addition, the area surrounded by the outer end of the blade 3, the outer edge of the rear cover plate 2 and the outer edge of the front cover plate 1 is the water outlet 6.

[0033] In actual application, the part of the rear cover plate 2 matched with the blade 3 is a flat ring part 9, the welding position is arranged on the flat ring part 9, the bottom wall 10 of the blade 3 provided with the welding protrusion 7 is located on the same plane adapted to the flat ring part 9, and the part of the front cover plate 1 matched with the blade 3 is a frustum or circular arc frustum extending in the axial direction away from the rear cover plate 2 with the radius gradually decreasing in the direction away from the rear cover plate 2.

[0034] In the technical scheme, the front cover plate 1 is in a space three-dimensional structure shape, therefore, the blade 3 is integrally formed with the front cover plate 1, which is convenient for injection molding and beneficial to improve the production and processing efficiency, and can improve the cooperation reliability and consistency of the blade 3 and the front cover plate 1 (that is, in the production process, the same batch or different batches can produce products with consistent specifications).

[0035] In the technical solution, the back cover plate 2 has a flat ring part 9 which is adapted to the plane where the bottom wall 10 of the blade 3 is located, so that after the welding protrusion 7 is inserted into the welding groove 8 and welded, the bottom wall 10 of the blade 3 can be attached to the flat ring part 9 on the back cover plate 2, which is conducive to ensuring that the insertion and welding process is stable, reliable and smooth, and conducive to ensuring that the bottom wall 10 of the blade 3 can be completely attached to the flat ring part 9 on the back cover plate 2, avoiding gaps and leakage, and conducive to ensuring the working efficiency of the closed impeller.

[0036] In actual application, the welding protrusion 7 is a protrusion protruding towards the back cover plate 2, and the interval distance between adjacent welding protrusions 7 on the same blade 3 is 1mm-3mm.

[0037] In the embodiment, the interval distance is preferably 1.5mm, 1.8mm, 2.2mm or 2.7mm.

[0038] In the technical solution, the interval distance between adjacent welding protrusions 7 on the same blade 3 is limited, which is conducive to accurately inserting the welding protrusion 7 into the welding groove 8, preventing the welding protrusion 7 from breaking or failing to be inserted, thereby improving the welding efficiency, and ensuring the overall strength of the back cover plate 2, preventing the back cover plate 2 from breaking when the welding protrusion 7 and the welding groove 8 are inserted or welded.

[0039] In addition, for different blades 3, the interval distance between adjacent welding protrusions 7 on each blade 3 can be the same or different, depending on the actual situation.

[0040] In actual application, the height of the welding protrusion 7 is h1, the thickness of the flat ring part 9 is h2, and the thickness of the blade 3 is H, 1 / 5h2≤h1≤2 / 5h2, and 1 / 5H≤h1≤1 / 2H.

[0041] In the embodiment, under the condition of meeting the above conditions, h1 is preferably 1 / 4h2, 6 / 20h2 or 7 / 20h2; h1 is preferably 1 / 4H, 2 / 5H, 3 / 10H or 9 / 20H.

[0042] In the technical solution, it is conducive to ensuring that the welding protrusion 7 can melt enough molten material to fix the blade 3 and the back cover plate 2 during welding, ensuring the welding reliability, and it is conducive to ensuring the strength of the flat ring part 9, i.e. the strength of the back cover plate 2, thereby improving the production yield of the closed impeller, improving the production efficiency of the closed impeller, and reducing the production cost of the closed impeller.

[0043] In practical application, the side wall of the welding protrusion 7 and the side wall of the welding groove 8 are in clearance fit to form a welding slag accommodating space, and the height of the welding protrusion 7 is greater than the depth of the welding groove 8.

[0044] In the technical solution, the welding protrusion 7 and the welding groove 8 form a welding slag accommodating space, which is conducive to guiding and storing the welding slag generated in the welding process in the welding slag accommodating space, avoiding the closed impeller from entering the flow channel, and thus being conducive to ensuring the qualification rate and performance of the closed impeller. The height of the welding protrusion 7 is greater than the depth of the welding groove 8, which is conducive to improving the welding reliability and stability and ensuring the welding quality, and thus being conducive to ensuring the qualification rate and performance of the closed impeller.

[0045] In practical application, the diameter of the circumscribed circle of the bottom wall 10 of the blade 3 is greater than the diameter of the outer edge of the back cover plate 2, the outer edge of the back cover plate 2 is provided with an outwardly extending extension part 12, and the diameter of the circumscribed circle of the extension part 12 is adapted to the diameter of the circumscribed circle of the bottom of the blade 3.

[0046] In the technical solution, in order to improve the hydraulic performance of the closed impeller, the radius of the outer edge of the back cover plate 2 is smaller than the radius of the outer edge of the front cover plate 1, the outer end (i.e. the outer edge) of the blade 3 extends to the outside of the outer edge of the back cover plate 2, and the extension part 12 is provided, which is conducive to stably fixing the outer end of the blade 3, preventing the closed impeller from shaking during operation, and being conducive to ensuring the water flow performance of the closed impeller and reducing the working noise.

[0047] In practical application, the extension part 12 is an outwardly extending part of the welding part, and the circumferential bending direction of the extension part 12 and the circumferential bending direction of the welding part are both adapted to the bending direction of the blade 3.

[0048] In the technical solution, the outer end of the blade 3 is fixed while the flow channel length of the closed impeller is extended, which is conducive to improving the water flow performance of the closed impeller.

[0049] In practical application, the extension part 12 and the outer edge of the back cover plate 2 have a reinforcing part 13 therebetween, the reinforcing part 13 is arranged away from the working surface 14 of the blade 3, i.e. the reinforcing part 13 is arranged to bend and surround the area of the extension part 12.

[0050] In the technical solution, the reinforcing part 13 is provided, which is conducive to further improving the stability of fixing the outer end of the blade 3, further preventing the closed impeller from shaking during operation, and further being conducive to ensuring the water flow performance of the closed impeller and reducing the working noise.

[0051] In practical application, the reinforcing part 13 is in circular arc transition between the outer edge of the back cover plate 2 and the extension part 12.

[0052] In the technical solution, the circular arc transition is adopted, which is beneficial to reduce stress concentration, improve the overall strength of the extension part 12, and reduce the possibility of fracture of the extension part 12.

[0053] The above merely describes preferred embodiments of the present application and is not intended to limit the present application. In the above embodiments, the present application can have various modifications and changes. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A closed impeller, comprising a front cover plate (1), a rear cover plate (2), and blades (3) disposed between the front cover plate (1) and the rear cover plate (2), characterized in that... The blade (3) and the front cover plate (1) are an integral structure. Each blade (3) has several spaced welding protrusions (7) on its bottom wall (10). The welding protrusions (7) are set away from the front cover plate (1). The rear cover plate (2) has several welding positions. The welding positions are set one-to-one with the blade (3). Each welding position has several spaced welding grooves (8). The welding protrusions (7) are inserted into the welding grooves (8) one-to-one and welded to be fixed.

2. The closed impeller according to claim 1, characterized in that... The part of the rear cover plate (2) that mates with the blade (3) is a flat ring (9). The welding part is located on the flat ring (9). The bottom wall (10) of the blade (3) with the welding protrusion (7) is located on the same plane that is adapted to the flat ring (9). The part of the front cover plate (1) that mates with the blade (3) is a frustum or arc shape with a radius that gradually decreases along the direction away from the rear cover plate (2) and extends axially away from the rear cover plate (2).

3. The closed impeller according to claim 2, characterized in that... The welding protrusion (7) is a protrusion that protrudes towards the rear cover plate (2), and the interval between adjacent welding protrusions (7) on the same blade (3) is 1mm to 3mm.

4. The closed impeller according to claim 2, characterized in that... The height of the welding protrusion (7) is h1, the thickness of the flat plate ring (9) is h2, the thickness of the blade (3) is H, 1 / 5h2≤h1≤2 / 5h2, 1 / 5H≤h1≤1 / 2H.

5. The closed impeller according to any one of claims 1-4, characterized in that... The sidewall of the welding protrusion (7) and the sidewall of the welding groove (8) are fitted together to form a slag-accommodating space, and the height of the welding protrusion (7) is greater than the depth of the welding groove (8).

6. The closed impeller according to any one of claims 1-4, characterized in that... The outer diameter of the bottom wall (10) of the blade (3) is larger than the outer diameter of the rear cover plate (2). The outer edge of the rear cover plate (2) is provided with an outer extension (12) extending radially outward. The outer diameter of the outer extension (12) is adapted to the outer diameter of the bottom of the blade (3).

7. The closed impeller according to claim 6, characterized in that... The extension portion (12) is the outward extension of the welding part, and the circumferential bending direction of the extension portion (12) and the circumferential bending direction of the welding part are both adapted to the bending direction of the blade (3).

8. The closed impeller according to claim 7, characterized in that... The extension portion (12) has a reinforcement portion (13) between the outer edge of the rear cover plate (2). The reinforcement portion (13) is disposed away from the working surface (14) of the blade (3), that is, the reinforcement portion (13) is disposed in the area surrounded by the extension portion (12).

9. The closed impeller according to claim 8, characterized in that... The reinforcing part (13) and the outer edge of the rear cover plate (2) and the extension part (12) are connected by a rounded transition.

10. The closed impeller according to any one of claims 1-4, characterized in that... The outer diameter of the front wall (11) of the blade (3) is larger than the outer diameter of the bottom wall (10) of the blade (3). The radius of the outer end of the blade (3) gradually decreases from the front wall (11) to the rear wall. A bushing (4) is integrally formed on the rear cover plate (2). A water inlet (5) is provided in the middle of the front cover plate (1). The bushing (4) is inserted from back to front through the water inlet (5). The diameter of the water inlet (5) is larger than the outer diameter of the bushing (4).

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