Closed impeller for cooling water pump of automobile engine

Abstract

The utility model discloses a closed impeller for a cooling water pump of an automobile engine, which comprises blades, a rear end cover, a front end cover and a hub, the blades, the front end cover and the hub are integrated into a whole, and the rear end cover is connected with the hub and the bottoms of the blades in a welding manner; according to the utility model, a welding point is changed from the front end cover to the rear end cover, so that in the application process of the high-lift water pump, the risk that the front end cover falls off is effectively solved, the after-sale compensation is effectively reduced, and the benefits of a company are improved.

Description

Technical Field

[0001] The utility model belongs to the technical field of pump impellers, in particular to a closed impeller for a cooling water pump of an automobile engine. Background Art

[0002] In the mechanical cooling water pump of automobile engines, the closed impeller is more efficient than the open impeller; when customers have high requirements for water pump efficiency, the closed impeller structure is usually selected. Due to the limitations of the closed impeller structure, it cannot be integrally injection molded, and a split structure design is usually adopted. Figure 1 The closed impeller structure shown includes blades 1, a rear end cover 2, a metal bushing 3 and a front end cover 4. The blades are evenly distributed on the rear end cover, the tops of the blades are connected to the front end cover, and the metal bushing is fixed in the center hole of the rear end cover.

[0003] The existing production method is: first, the blade, rear cover and metal bushing are integrated into a whole by injection molding, and then the front cover and the top of the blade are welded together by ultrasonic welding. Affected by the stability of the welding process, the pull-off force of the impeller front cover and the impeller body after welding varies in the range of 1 KN to 2.5 KN; for high-lift water pumps (lift greater than 350 kPa), when the axial force on the impeller front cover is greater than the pull-off force of welding during the operation of the water pump, the front cover will fall off, causing the water pump to fail. Utility Model Content

[0004] The utility model provides a closed impeller for a cooling water pump of an automobile engine, aiming to solve the problem that a front end cover is easy to fall off.

[0005] In order to solve the above technical problems, the technical solution of the utility model is: a closed impeller for an automobile engine cooling water pump, comprising blades, a rear end cover, a front end cover and a hub, characterized in that the blades, the front end cover and the hub are integrated into a whole, and the rear end cover is connected to the hub and the bottom of the blade by welding.

[0006] The above technical solution is further improved in that a welding strip is preset on the bottom of the blade.

[0007] The above technical solution is further improved in that a welding groove is provided on the rear end cover corresponding to the blade.

[0008] The above technical solution is further improved in that a plurality of first grooves are distributed circumferentially on the outer circumferential surface of the hub, and the first grooves are staggered with the blades; a plurality of second grooves are distributed circumferentially on the hole wall of the rear end cover; the first grooves and the second grooves together form a balancing hole.

[0009] The above technical solution is further improved in that a metal bushing is provided in the hole cavity of the hub.

[0010] Beneficial effect: The utility model changes the welding point from the front cover to the rear cover, which effectively solves the risk of the front cover falling off during the application of high-lift water pumps, effectively reduces after-sales compensation, and improves the company's benefits. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] Figure 1 It is a structural schematic diagram in the background technology.

[0012] Figure 2 It is a schematic diagram of the structure of the utility model.

[0013] Figure 3 It is an integrated diagram of the blade, front end cover and hub.

[0014] Figure 4 is a schematic diagram of the rear end cover. DETAILED DESCRIPTION

[0015] The structural design of the utility model is based on the theory that when the water pump is working, the pressure difference in different areas of the impeller is different, and the required welding strength is different; the pressure difference between the impeller flow channel and the water pump inlet is higher than the pressure difference between the impeller flow channel and the bottom of the impeller; the axial force on the front cover is greater than the axial force on the rear cover. Based on this theory, the welding position of the closed impeller is designed at the rear cover.

[0016] like Figure 2 As shown, a closed impeller for a cooling water pump of an automobile engine comprises blades 1, a rear end cover 2, a front end cover 4 and a wheel hub 5, wherein the blades, the front end cover and the wheel hub are integrated into a whole; the integrated structure is further described as follows: the wheel hub is fixed at the center of the back of the front end cover, the blades are evenly distributed around the wheel hub on the front end cover, and one end of the blade adjacent to the wheel hub is connected to the wheel hub; the rear end cover is connected to the wheel hub and the bottom of the blade by welding; that is, the rear end cover is fixed to the wheel hub, the rear end cover is coaxial with the wheel hub, and the back of the rear end cover is connected to the bottom of the blade;

[0017] like Figure 3 As shown, a welding strip 6 is preset on the bottom of the blade 1, and the welding strip is fixed by bonding; Advantages: improve production efficiency and ensure welding quality;

[0018] like Figure 4 As shown, a welding groove 7 is provided on the rear end cover 2 at a position corresponding to the blade, and the shape of the welding groove is adapted to the blade; the welding groove can effectively fix various components to prevent potential safety hazards such as loosening and shaking, making the overall structure more stable and ensuring the welding quality; the welding groove can achieve high-strength connection, is not prone to fatigue fracture, etc., thereby improving the durability of the overall structure;

[0019] like Figure 3As shown, the outer surface of the hub 5 is circumferentially distributed with a plurality of first grooves 8, and the first grooves are arranged alternately with the blades; the hole wall of the rear end cover 2 is circumferentially distributed with a plurality of second grooves 9; the first grooves and the second grooves together form a balance hole, which introduces the high-pressure water at the bottom of the impeller into the water pump inlet, reducing the axial force generated by the pressure difference between the high pressure at the bottom of the impeller and the low pressure at the water pump inlet. At the same time, the water around the water seal is circulated to improve the heat dissipation conditions of the water seal;

[0020] like Figure 2 and Figure 3 As shown, a metal bushing 3 is provided in the hole of the wheel hub 5; the metal bushing is connected to the wheel hub as a whole by injection molding.

[0021] The utility model has passed the actual slip torque test. When the impeller and the bearing slip in the axial direction (slip torque 80-100 N·m), the welding structure of the hub, blades and rear end cover does not crack or loosen, indicating that the utility model structure meets the strength requirements during application. The utility model structure solves the problem of the closed impeller adopting the front end cover welding structure, avoiding the risk of the front end cover falling off during the application of high-lift water pumps, effectively reducing after-sales compensation and improving the company's benefits.

Claims

1. A closed impeller for a cooling water pump of an automobile engine, comprising blades, a rear end cover, a front end cover and a hub, characterized in that: The blade, the front end cover and the wheel hub are integrated into a whole, and the rear end cover is connected with the wheel hub and the bottom of the blade by welding; a welding strip is preset on the bottom of the blade; and a welding groove is provided on the rear end cover corresponding to the blade.

2. A closed impeller for an automobile engine cooling water pump according to claim 1, characterized in that: A plurality of first grooves are distributed circumferentially on the outer circumferential surface of the hub, and the first grooves are arranged alternately with the blades; a plurality of second grooves are distributed circumferentially on the hole wall of the rear end cover; the first grooves and the second grooves together form a balancing hole.

3. A closed impeller for an automobile engine cooling water pump according to claim 1 or 2, characterized in that: A metal bushing is arranged in the hole cavity of the wheel hub.

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