Pump head of self-priming pump

Abstract

The utility model relates to a pump head of a self-priming pump, and belongs to the technical field of centrifugal pumps. The pump head comprises a pump head cover and a pump head cover, a pump cavity is formed between the pump head cover and the pump head cover, and an impeller and a flow guide cover are arranged in the pump cavity. An abutting ring is formed on the side wall of the flow guide opening of the impeller, and when the flow guide cover sleeves the impeller, the inner hole wall of the flow guide cover abuts against the abutting ring to prevent axial movement. A limiting set is arranged at the front end of the pump head cover, and a limiting protrusion is arranged on the outer wall of the flow guide cover and embedded into the limiting groove to prevent circumferential rotation. An annular abutting ring is further arranged on the front side of the pump head cover, the outer wall of the flow guide cover abuts against the abutting ring, and fixation is guaranteed. Supporting reinforcing ribs are arranged on the front side of the flow guide cover to enhance the structural strength. The water pipe seat is mounted through a bolt, so that the water inlet amount is increased, and the water pipe is convenient to disassemble. By optimizing the fixing structure of the flow guide cover, vibration and noise are reduced, the stability of the pump body is improved, the service life of the pump body is prolonged, and meanwhile water outlet efficiency is improved.

Description

Technical Field

[0001] This utility model belongs to the field of centrifugal pump technology, and specifically refers to a pump head for a self-priming pump. Background Technology

[0002] Currently, centrifugal pumps refer to pumps that transport liquids using the centrifugal force generated by the rotation of an impeller. During operation, the pump shaft drives the impeller and water to rotate at high speed. The water undergoes centrifugal motion, being thrown towards the outer edge of the impeller and flowing into the pump's pressure pipeline through the flow channel of the volute casing. Self-priming pumps, on the other hand, have a larger pump casing and effectively isolate the inlet and outlet water through a dual-chamber design. Therefore, after each shutdown, a self-priming pump is more likely to retain a certain amount of working medium in the pump chamber, making it easier to directly start the pump again to draw water and pressurize it.

[0003] As a core component for improving efficiency in self-priming pumps, the flow guide shroud directly affects the pump's self-priming performance, energy efficiency, and reliability. Traditional self-priming pumps have a relatively simple installation method for the flow guide shroud within the pump head, using a sleeve-on-the-end fitting. This method not only allows for some axial sliding but also some circumferential misalignment. Both sliding and misalignment generate noise due to vibration, reduce pump lifespan, and affect pump efficiency. Summary of the Invention

[0004] The purpose of this invention is to provide a pump head for a self-priming pump that provides a more stable fixing structure for the installation of the flow guide, while effectively preventing the flow guide from shifting in the axial and circumferential directions, thereby improving the overall stability of the pump body.

[0005] The purpose of this utility model is achieved as follows:

[0006] 1. A pump head for a self-priming pump, comprising a pump head cover with a motor shaft hole in the middle, a pump head cover with a sealing cap and a pump head shroud, and a pump cavity formed between the pump head shroud and the pump head cover, an outlet on the side wall of the pump head shroud, an inlet on the front side of the pump head shroud, an impeller coaxial with the motor shaft hole and a guide shroud fitted on the impeller guide port are arranged in the pump cavity, the inlet of the guide shroud is connected to the inlet, the impeller is embedded inside the guide shroud, the outlet of the guide shroud is connected to the pump cavity, and an abutment ring is formed on the side wall of the impeller guide port, wherein when the guide shroud is fitted on the impeller guide port, the end of the inner wall of the guide shroud abuts against the end face of the abutment ring.

[0007] The present invention is further configured such that the front end face of the pump head cover is provided with a relative limiting group, the limiting group including two adjacent limiting protrusions formed on the front end face of the pump head cover, a limiting groove is formed between the two limiting protrusions, and a limiting protrusion embedded in the limiting groove is formed on the outer wall of the flow guide.

[0008] The present invention is further configured such that an annular abutment ring is provided on the front side of the pump head cover, the outer wall of the flow guide cover abuts against the inner wall of the abutment ring, the limiting component is formed on the top of the abutment ring, and a snap-fit ​​groove for snapping the abutment ring is formed between the bottom of the limiting protrusion and the flow guide cover wall.

[0009] The present invention is further provided that the front side of the flow guide is provided with a plurality of supporting reinforcing ribs formed between the flow guide and the side wall of the flow guide inlet.

[0010] The present invention is further configured such that the water inlet is rectangular, a water pipe seat is installed at the water inlet by bolts, and the side wall of the water inlet extends into the pump cavity and is connected to the water inlet of the guide shroud.

[0011] The outstanding and beneficial technical effects of this utility model compared to the prior art are:

[0012] 1. The pump head of the self-priming pump provided by this utility model utilizes an abutment ring formed on the side wall of the impeller guide port that can abut against the inner hole of the guide shroud, so as to prevent excessive axial movement of the guide shroud, reduce vibration and noise, and effectively ensure the service life of the pump body.

[0013] 2. The present invention further provides a limiting group on the pump head cover, which can keep the guide cover stable in the circumferential direction during operation, prevent the guide cover from rotating axially, reduce noise and enhance water output efficiency.

[0014] 3. The abutment ring further provided on the pump head cover in this utility model allows the outer wall of the guide shield to be properly locked in the abutment ring during installation. At the same time, the locking groove ensures that while the outer wall of the guide shield is abutting in the abutment ring, the limiting protrusion can still be locked in the limiting groove, ensuring the normal fixed use of the guide shield.

[0015] 4. This utility model further makes the water inlet rectangular, which allows for a larger water intake than the traditional circular hole. At the same time, the independent water pipe seat facilitates the installation of the water pipe. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the structure of this utility model;

[0017] Figure 2 This is an exploded view of the present invention;

[0018] Figure 3 This is a schematic diagram of the structure of the air guide cover of this utility model;

[0019] Figure 4 This is a schematic diagram of the structure of the pump head cover of this utility model;

[0020] Figure 5This is a cross-sectional schematic diagram of the present invention;

[0021] Figure label:

[0022] 1-Pump head cover; 10-Limit assembly; 11-Limit protrusion; 12-Limit groove; 13-Abutment ring;

[0023] 2-Pump head cover; 20-Pump chamber; 21-Outlet; 22-Inlet

[0024] 3-Impeller; 30-Abutting ring;

[0025] 4-Diffuser shield; 40-Limiting protrusion; 41-Snap-fit ​​groove; 42-Supporting reinforcing rib;

[0026] 5-Water pipe fitting. Detailed Implementation

[0027] The present invention will be further described below with reference to the accompanying drawings and specific embodiments. See also: Figure 1 — Figure 4 :

[0028] A pump head for a self-priming pump includes a pump head cover 1 with a motor shaft hole in the middle. The pump head cover 1 is sealed with a pump head shroud 2, and a pump cavity 20 is formed between the pump head shroud 2 and the pump head cover 1. A water outlet 21 is provided on the side wall of the pump head shroud 2, and a water inlet 22 is provided on the front side of the pump head shroud 2. An impeller 3 coaxial with the motor shaft hole and a guide shroud 4 sleeved on the guide port of the impeller 3 are arranged in the pump cavity 20. The water inlet of the guide shroud 4 is connected to the water inlet 22. The impeller 3 is embedded in the guide shroud 4, and the water outlet of the guide shroud 4 is connected to the pump cavity 20. An abutment ring 30 is formed on the side wall of the guide port of the impeller 3. When the guide shroud 4 is sleeved on the guide port of the impeller 3, the end of the inner wall of the guide shroud 4 abuts against the end face of the abutment ring 30.

[0029] The specific installation process is as follows: the output shaft of the drive motor extends into the motor shaft hole of the pump head cover 1, and then the impeller 3 is fixed to the output shaft of the drive motor. During the fixing process, the shaft and the hole are fixed by means of a key. Next, the guide shroud 4 is fitted onto the guide port of the impeller, and finally the pump head cover is installed.

[0030] During use, the abutment ring 30 on the impeller allows the ends of the inner hole of the guide shield to abut against each other, preventing the guide shield from vibrating in the axial direction and reducing noise. The stable guide shield can provide continuous and stable water output, ensuring the water output efficiency of the self-priming pump.

[0031] Preferably, the front end face of the pump head cover 1 is provided with opposing limiting groups 10. The limiting group 10 includes two adjacent limiting protrusions 11 formed on the front end face of the pump head cover 1, and a limiting groove 12 is formed between the two limiting protrusions 11. A limiting protrusion 40 embedded in the limiting groove 12 is formed on the outer wall of the flow guide shroud 4.

[0032] In the above structure, when the guide shield is installed, the limiting protrusion 40 of the guide shield is embedded in the limiting groove 12, so that the guide shield cannot rotate axially, allowing the water from the impeller to flow steadily and continuously from the outlet of the guide shield, reducing noise and enhancing the water output effect.

[0033] Preferably, an annular abutment ring 13 is provided on the front side of the pump head cover 1, the outer wall of the flow guide shroud 4 abuts against the inner wall of the abutment ring 13, the limiting group 10 is formed on the top of the abutment ring 13, and a snap-fit ​​groove 41 for snapping the abutment ring 13 is formed between the bottom of the limiting protrusion 40 and the wall of the flow guide shroud 4.

[0034] During implementation, the abutment ring 13 facilitates the accurate positioning of the air guide 4 during installation, and the snap-fit ​​groove 41 ensures that the limiting protrusion 40 can still be locked in the limiting groove 12, thus guaranteeing the circumferential fixation of the air guide 4.

[0035] Preferably, the front side of the flow guide shroud 4 is provided with a plurality of supporting reinforcing ribs 42 formed between it and the side wall of the water inlet of the flow guide shroud 4. The use of supporting reinforcing ribs 42 improves the overall structural strength of the flow guide shroud.

[0036] Preferably, the inlet 22 is rectangular, and a water pipe seat 5 is bolted to the inlet 22. The side wall of the inlet 22 extends into the pump chamber 20 and communicates with the inlet of the guide shroud 4. The independent water pipe seat allows for the disassembly of the water pipe. The water pipe seat has a flange connection end at one end and a pipe opening for connecting the water pipe at the other end. The rectangular inlet can increase the water intake and improve the output of the self-priming pump.

[0037] The above embodiments are merely preferred embodiments of the present utility model and are not intended to limit the scope of protection of the present utility model. Therefore, all equivalent changes made to the structure, shape, and principle of the present utility model should be covered within the scope of protection of the present utility model.

Claims

1. A pump head of a self-priming pump, comprising a pump head cover (1) with a motor shaft hole in the middle, a sealing cover of the pump head cover (1) is provided with a pump head cover (2), and a pump cavity (20) is formed between the pump head cover (2) and the pump head cover (1), a water outlet (21) is formed on the side wall of the pump head cover (2), and a water inlet (22) is formed on the front side of the pump head cover (2), characterized in that, The pump cavity (20) is provided with an impeller (3) coaxial with the motor shaft hole and a flow guide cover (4) sleeved on the flow guide port of the impeller (3). The water inlet of the flow guide cover (4) is communicated with the water inlet (22). The impeller (3) is embedded in the inside of the flow guide cover (4). The water outlet of the flow guide cover (4) is communicated with the pump cavity (20). The flow guide port side wall of the impeller (3) is formed with an abutting ring (30). When the flow guide cover (4) is sleeved on the flow guide port of the impeller (3), the end of the inner hole wall of the flow guide cover (4) abuts against the end face of the abutting ring (30).

2. A pump head of a self-priming pump according to claim 1, characterized in that The front end face of the pump head cover (1) is provided with opposite limiting groups (10). The limiting group (10) includes two adjacent limiting protrusions (11) formed on the front end face of the pump head cover (1). The limiting grooves (12) are formed between the two limiting protrusions (11). The outer wall of the flow guide cover (4) is formed with limiting protrusions (40) embedded in the limiting grooves (12).

3. A pump head for a self-priming pump according to claim 2, wherein The front side of the pump head cover (1) is provided with an annular abutting ring (13). The outer wall of the flow guide cover (4) abuts against the inner wall of the abutting ring (13). The limiting group (10) is formed on the top of the abutting ring (13). The bottom of the limiting protrusion (40) and the wall of the flow guide cover (4) are formed with a clamping groove (41) for clamping the abutting ring (13).

4. The pump head of a self-priming pump according to claim 1, wherein The front side of the flow guide cover (4) is provided with a plurality of support reinforcing ribs (42) formed between the side wall of the water inlet of the flow guide cover (4).

5. The pump head of a self-priming pump according to claim 1, wherein The water inlet (22) is rectangular. The water pipe seat (5) is installed at the water inlet (22) by bolts. The side wall of the water inlet (22) extends into the pump cavity (20) and is communicated with the water inlet of the flow guide cover (4).

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