Water pump capable of preventing air clogging

Abstract

The utility model relates to a water pump capable of preventing air clog, which solves the problem that the service life of a mechanical seal is affected due to the fact that the mechanical seal is at least subjected to dry grinding when air clog is gathered at the mechanical seal on a pump cover in the prior art, and adopts the technical scheme that the water pump comprises a pump body, a pump core arranged in the pump body and the pump cover arranged at the open end of the pump body, the pump core comprises a pump shaft, an impeller and a mechanical seal, the impeller and the mechanical seal are arranged on the pump shaft, the pump shaft penetrates through the pump cover, the mechanical seal is arranged between the pump shaft and the pump cover, and the anti-clog device is characterized in that a flow guide device is arranged between the impeller and the pump cover, the anti-clog device is arranged on the pump shaft, and the flow guide device is arranged on the pump shaft. And the motor is used for driving liquid to flow to the mechanical seal to extrude air clog and lubricate the mechanical seal. The anti-clog device has the advantages that a part of liquid coming out of the impeller is pushed to the mechanical seal through the anti-clog device, clog is squeezed out to enable the mechanical seal to be soaked in water to be lubricated by water, dry grinding of the mechanical seal is avoided, and the service life of the mechanical seal is prolonged.

Description

Technical Field

[0001] The utility model relates to the field of water pumps, in particular to an anti-air trap water pump. Background Art

[0002] When a pump (such as a multi-stage pump) is running, as the flow rate increases, the amount of air sucked into the pump increases accordingly. The air tends to accumulate rapidly at the pump cover to form air pockets. The mechanical seal installed at the center of the pump cover is often wrapped in the air pockets. The air pockets isolate the mechanical seal from the water between the deflector and the pump cover. The water between the deflector and the pump cover cannot lubricate the mechanical seal, making it easy for the mechanical seal to be damaged by dry grinding, which greatly affects its service life.

[0003] In order to prevent the occurrence of air pockets, people have also taken some measures. For example, the Chinese utility model patent with the announcement number CN 213839016U discloses a technical solution for a pump cover with a guide device, which includes a pump cover body. The pump cover body is a circular cover body. The center of the pump cover body is recessed along the axial direction of the pump cover body to form a cavity. The cross section of the cavity is trapezoidal. A center hole is provided on the bottom surface of the cavity. A number of guide plates are provided on the side walls of the cavity. The guide plates are arranged along the radial direction of the pump cover body. The guide plates are triangular plates, and a chamfered surface is provided on one corner facing the cavity. By arranging the guide plates inside the pump cover, a trapezoidal cavity is formed between the guide plates and the bottom of the pump cover, so that the material entering the pump cover cavity can have a large separation space. Under the action of the centrifugal force of the rotating mechanical seal, the medium containing material particles can be kept away from the end face of the mechanical seal, so as to achieve the purpose of extending the service life of the mechanical seal. Although this technical solution can effectively prevent particulate materials from gathering at the mechanical seal, it is difficult to prevent air from accumulating at the mechanical seal, and cannot effectively discharge gas from the pump body together with liquid, causing air pockets, resulting in dry grinding of the mechanical seal, and affecting the service life of the mechanical seal. Summary of the invention

[0004] The utility model aims to solve the above-mentioned problems existing in the prior art and to provide an anti-air trap water pump, in which a part of the liquid coming out of the impeller is pushed to the machine seal through the anti-air trap device, so that the air trap is squeezed out and the machine seal is immersed in water to obtain water lubrication, thereby avoiding dry grinding of the machine seal and improving the service life of the machine seal.

[0005] The above technical purpose of the utility model is mainly solved by the following technical solutions: an anti-gas-pitting water pump, including a pump body, a pump core arranged in the pump body, and a pump cover arranged at the open end of the pump body, the pump core including a pump shaft, an impeller arranged on the pump shaft, and a mechanical seal, the pump shaft passes through the pump cover, the mechanical seal is arranged between the pump shaft and the pump cover, characterized in that an anti-gas-pitting device is arranged between the impeller and the pump cover, the anti-gas-pitting device is arranged on the pump shaft, and is used to drive the liquid to flow to the mechanical seal to squeeze out the gas pits. A part of the liquid coming out of the impeller is pushed to the mechanical seal by the anti-gas-pitting device, and the gas pits are squeezed out so that the mechanical seal is immersed in water and lubricated by water, thereby avoiding dry grinding of the mechanical seal and improving the service life of the mechanical seal.

[0006] As a further improvement and supplement to the above technical solution, the utility model adopts the following technical measures: the working flow rate of the anti-gas nest device is 0.5-2.5% of the working flow rate of the impeller. The working flow rate of the anti-gas nest device refers to the speed at which the anti-gas nest device drives the fluid to flow when it is working, and the working flow rate of the impeller refers to the speed at which the impeller drives the fluid to flow when it is working. When the anti-gas nest device drives the liquid inside to flow to the gas nest, it will have a certain degree of influence on the liquid in the pump body and affect the performance of the pump. By limiting the flow rate of the anti-gas nest device at the same speed, the working performance of the pump is ensured, and the occurrence of gas nests can be prevented or reduced.

[0007] Preferably, in order to push the liquid to the air nest more smoothly, the distance between the impeller and the mechanical seal is D, and the anti-air nest device is arranged at 1 / 10D to 1 / 5D close to the impeller.

[0008] Preferably, the anti-gas pocket device is an axial flow impeller, which is used to push the liquid to the gas pocket along the axial direction of the rotating shaft.

[0009] Preferably, the axial flow impeller is provided with a plurality of axial flow blades arranged at equal intervals, and the inlet and outlet angles of the axial flow blades are 30 to 60 degrees. By limiting the inclination angle of the axial flow blades, it is beneficial for the axial flow blades to effectively guide and push the liquid, so that the liquid rushes to the mechanical seal under the accumulation and pushing action of the axial flow blades to squeeze out the air pockets, ensuring that the mechanical seal is immersed in water.

[0010] Preferably, a reinforcement ring is provided at the outer end of the axial flow blade to strengthen the axial flow blade to prevent the axial flow blade from shaking during operation, which is conducive to effectively accumulating liquid and pushing the liquid toward the mechanical seal direction, thereby improving the anti-gas trap effect. In addition, the provision of the reinforcement ring is conducive to strengthening the strength of the axial flow blade and preventing the axial flow blade from deformation or breakage.

[0011] Preferably, the axial width of the reinforcement ring is adapted to the axial width of the axial flow blade, and the impeller and the corresponding end of the reinforcement ring are gap-matched. Limiting the width of the reinforcement ring is conducive to further strengthening the strength of the axial flow blade and further improving the anti-shake effect. In addition, the width of the reinforcement ring is also conducive to increasing the volume and area of ​​the fluid channel formed between the reinforcement ring and each axial flow blade, which is conducive to controlling a sufficient amount of liquid to be pushed to the air pocket, further improving the anti-air pocket effect.

[0012] Preferably, a guide groove is provided on a side of the fixing ring facing the impeller, and the guide groove is used to guide the liquid to flow toward the inner direction of the axial flow impeller.

[0013] Preferably, the fixing ring on the axial flow impeller is fixed to the rotating shaft via a connecting piece, and the outer diameter of the fixing ring is not less than the outer diameter of the mechanical seal, which helps to avoid obstruction when the axial flow impeller pushes the liquid to rush to the mechanical seal.

[0014] Preferably, the fixing ring is provided with radial positioning holes, and the connecting piece is inserted into the positioning holes to form a connection with the rotating shaft. When a reinforcement ring is provided, a coaxial positioning hole is also provided at a corresponding part of the reinforcement ring, so that the connecting piece can pass through the positioning hole from outside to inside to form a connection with the rotating shaft.

[0015] The utility model has the following beneficial effects: 1. The anti-gas nest device can not only push part of the liquid coming out of the impeller to the machine seal and squeeze out the gas nest, but also make the machine seal immersed in water to obtain water lubrication, avoid dry grinding of the machine seal, which is beneficial to improve the service life of the machine seal and ensure the pump performance. 2. The anti-gas nest device is suitable for various water pumps that need to squeeze out the gas nest. 3. The specific structure of the anti-gas nest device can effectively improve the efficiency of pushing the liquid to the machine seal to squeeze out the gas nest, and at the same time has the effects of anti-shake, good overall strength, and convenient assembly. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a partial structural schematic diagram of the utility model.

[0017] Figure 2 yes Figure 1 Schematic diagram of the enlarged structure of part A in the middle.

[0018] Figure 3 It is a structural schematic diagram of the anti-air trap device involved in Example 1.

[0019] Figure 4 It is a structural schematic diagram of the anti-air trap device involved in Example 2.

[0020] In the figure: 1. Pump body; 2. Pump cover; 3. Mechanical seal; 4. Deflector; 5. Impeller; 6. Anti-air trap device; 7. Axial flow blades; 8. Reinforcement ring; 9. Fixing ring; 10. Positioning hole; 11. Water outlet; 12. Pump shaft; 13. Connecting parts. DETAILED DESCRIPTION

[0021] The technical solution of the utility model is further specifically described below through embodiments and in conjunction with the accompanying drawings.

[0022] Example 1: Figure 1-4 As shown, an anti-gas-sink water pump comprises a pump body 1 (or a pressure-resistant cylinder), a pump core arranged in the pump body 1, and a pump cover 2 arranged at the open end of the pump body 1. The pump core comprises a pump shaft 12, an impeller 5 and a mechanical seal 3 arranged on the pump shaft 12. The pump shaft 12 passes through the pump cover 2, and the mechanical seal 3 is arranged between the pump shaft 12 and the pump cover 2. The difference between this technical solution and the prior art is that:

[0023] An anti-gas-pitting device 6 is provided between the impeller 5 and the pump cover 2. The anti-gas-pitting device 6 is provided on the pump shaft 12 and is used to drive the liquid to flow to the mechanical seal 3 to squeeze out the gas pits. A portion of the liquid from the impeller 5 is pushed to the mechanical seal 3 through the anti-gas-pitting device 6 to squeeze out the gas pits so that the mechanical seal 3 is immersed in water to obtain water lubrication, thereby avoiding dry grinding of the mechanical seal 3 and facilitating the service life of the mechanical seal 3.

[0024] In practical applications, the working flow rate of the anti-gas nest device 6 is 0.5-2.5% of the working flow rate of the impeller 5. The working flow rate of the anti-gas nest device 6 refers to the speed at which the anti-gas nest device 6 drives the fluid to flow when it is working, and the working flow rate of the impeller 5 refers to the speed at which the impeller 5 drives the fluid to flow when it is working. When the anti-gas nest device 6 drives the liquid inside it to flow to the gas nest, it will have a certain degree of influence on the liquid in the pump body 1 and affect the performance of the pump. By limiting the flow rate of the anti-gas nest device 6 at the same speed, the working performance of the pump is ensured, and the occurrence of gas nests can be prevented or reduced.

[0025] In practical applications, in order to push the liquid to the air nest more smoothly, the distance between the impeller 5 and the mechanical seal 3 is D, and the anti-air nest device 6 is arranged at 1 / 10D to 1 / 5D close to the impeller 5.

[0026] In practical applications, the anti-air pocket device 6 is an axial flow impeller 5, which is used to push the liquid to the air pocket along the axial direction of the rotating shaft.

[0027] In practical applications, the axial flow impeller 5 is provided with a plurality of axial flow blades 7 arranged at equal intervals, and the inlet and outlet angles of the axial flow blades 7 are 30 to 60 degrees, preferably 40 to 50 degrees. By limiting the inclination angle of the axial flow blades 7, it is beneficial for the axial flow blades 7 to effectively guide and push the liquid, so that the liquid rushes to the mechanical seal 3 under the accumulation and pushing action of the axial flow blades 7 to squeeze out the air pockets, ensuring that the mechanical seal 3 is immersed in water.

[0028] In practical applications, a guide groove is provided on a side of the fixing ring 9 facing the impeller 5 , and the guide groove is used to guide the liquid to flow toward the inner direction of the axial flow impeller 5 .

[0029] In practical applications, the fixing ring 9 on the axial flow impeller 5 is fixed to the rotating shaft through a connecting piece 13, and the outer diameter of the fixing ring 9 is not less than the outer diameter of the mechanical seal 3, which helps to avoid obstruction when the axial flow impeller 5 pushes the liquid to rush to the mechanical seal 3.

[0030] In practical applications, the fixing ring 9 is provided with radial positioning holes 10, and the connecting member 13 is inserted into the positioning holes 10 to form a connection with the rotating shaft. In this embodiment, the connecting member 13 is a screw, and the positioning holes 10 are threaded holes.

[0031] Example 2: Figure 1 , Figure 2 and Figure 4 As shown, the difference from Example 1 is that a reinforcing ring 8 is provided at the outer end of the axial flow blade 7, and the reinforcing ring 8 is used to strengthen the axial flow blade 7 to prevent the axial flow blade 7 from shaking during operation, which is conducive to effectively accumulating liquid and pushing the liquid toward the mechanical seal 3, thereby improving the anti-gas trap effect. In addition, the provision of the reinforcing ring 8 is conducive to strengthening the strength of the axial flow blade 7, which is conducive to preventing the axial flow blade 7 from deformation or breakage, thereby improving the overall strength of the axial flow impeller 5 and effectively improving the service life of the axial flow impeller 5.

[0032] In practical applications, the axial width of the reinforcing ring 8 is adapted to the axial width of the axial flow blade 7, and the impeller 5 and the corresponding end of the reinforcing ring 8 are gap-matched. Limiting the width of the reinforcing ring 8 is conducive to further strengthening the strength of the axial flow blade 7 and further improving the anti-shake effect. In addition, the width of the reinforcing ring 8 is also conducive to increasing the volume and area of ​​the fluid channel formed between the reinforcing ring 8 and each axial flow blade 7, which is conducive to controlling a sufficient amount of liquid to be pushed to the air pocket, and further improving the anti-air pocket effect.

[0033] In actual applications, in order to facilitate the connecting piece 13 to fix the axial flow impeller 5 on the rotating shaft, the corresponding position of the reinforcement ring 8 is also provided with a coaxial positioning hole, so that the connecting piece 13 can pass through the positioning hole 10 on the reinforcement ring 8 and the positioning hole 10 on the fixing ring 9 from the outside to the inside and then form a connection with the rotating shaft.

[0034] Example 3: Figure 1-Figure 4 As shown, in actual application, when the anti-gas nest device 6 is applied to a multi-stage pump, the anti-gas nest device 6 can also achieve the purpose of squeezing out the gas nests so that the mechanical seal 3 is immersed in water for water lubrication. Specifically:

[0035] There are multiple impellers 5, each of which corresponds to a deflector 4. The impellers 5 and the deflectors 4 are arranged in a one-to-one correspondence to form a multi-stage impeller deflector assembly. The impeller deflector assembly that cooperates with the water inlet on the pump body 1 is the first-stage impeller deflector assembly, and the impeller deflector assembly that cooperates with the water outlet 11 on the pump body 1 is the last-stage impeller deflector assembly. The anti-air trap device 6 is arranged in the inner cavity of the last-stage impeller deflector assembly and cooperates with the impeller in the last-stage impeller deflector assembly.

[0036] In actual application, the guide vane 4 on the last-stage impeller guide assembly is an outlet guide vane, the open end of the outlet guide vane is pressed against the inner wall of the pump cover 2, a plurality of water outlets are arranged on the side wall of the outlet guide vane, and the water outlets on the outlet guide vane are connected to the water outlet 11 on the pump body 1.

[0037] The above description is only a preferred embodiment of the utility model and is not intended to limit the utility model. In the above embodiments, the utility model can have various changes and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the utility model should be included in the protection scope of the utility model.

Claims

1. An anti-gassing water pump, comprising a pump body (1), a pump core arranged in the pump body (1), and a pump cover (2) arranged at the open end of the pump body (1), wherein the pump core comprises a pump shaft (12), an impeller (5) and a mechanical seal (3) arranged on the pump shaft (12), the pump shaft (12) passes through the pump cover (2), and the mechanical seal (3) is arranged between the pump shaft (12) and the pump cover (2), characterized in that An anti-air trap device (6) is provided between the impeller (5) and the pump cover (2); the anti-air trap device (6) is provided on the pump shaft (12) and is used to drive the liquid to flow toward the mechanical seal (3) to squeeze out air traps.

2. The anti-gassing water pump according to claim 1, characterized in that The working flow rate of the anti-gas nesting device (6) is 0.5-2.5% of the working flow rate of the impeller (5).

3. The anti-gassing water pump according to claim 2, characterized in that The distance between the impeller (5) and the mechanical seal (3) is D, and the anti-air trap device (6) is arranged at 1 / 10D to 1 / 5D close to the impeller (5).

4. The anti-gassing water pump according to claim 1, characterized in that The anti-gas nesting device (6) is an axial flow impeller (5) used to push the liquid to the gas nest along the axial direction of the rotating shaft.

5. The anti-gassing water pump according to claim 4, characterized in that The axial flow impeller (5) is provided with a plurality of axial flow blades (7) arranged at equal intervals, and the inlet and outlet placement angles of the axial flow blades (7) are 30 to 60 degrees.

6. The anti-gas trap water pump according to claim 5, characterized in that A reinforcing ring (8) is provided at the outer end of the axial flow blade (7) for reinforcing the axial flow blade (7) to prevent the axial flow blade (7) from shaking during operation.

7. The anti-gassing water pump according to claim 6, characterized in that The axial width of the reinforcement ring (8) is adapted to the axial width of the axial flow blade (7), and the corresponding ends of the impeller (5) and the reinforcement ring (8) are clearance-matched.

8. The anti-gas trap water pump according to claim 4 or 5, characterized in that The fixing ring (9) on the axial flow impeller (5) is fixed to the rotating shaft via a connecting piece (13), and the outer diameter of the fixing ring (9) is not less than the outer diameter of the mechanical seal (3).

9. The anti-gassing water pump according to claim 8, characterized in that A guide groove is provided on the side of the fixing ring (9) facing the impeller (5), and the guide groove is used to guide the liquid to flow toward the inside of the axial flow impeller (5).

10. The anti-gassing water pump according to claim 8, characterized in that The fixing ring (9) is provided with a radial positioning hole (10), and the connecting member (13) is inserted into the positioning hole (10) to form a connection with the rotating shaft.

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