Pump with flow stabilizing structure in pump cavity

Abstract

The utility model relates to a pump with a flow stabilizing structure in a pump cavity, which solves the problems of large vibration and noise generated by blades through frequency and low hydraulic efficiency in the prior art, and adopts the technical scheme that the pump comprises a pump body, an impeller arranged in the pump cavity of the pump body, and a pump cover for sealing an assembly opening of the pump cavity, the water pump is characterized in that a flow stabilizing structure is arranged in the pump cavity, and the flow stabilizing structure is used for resisting disturbance of water flow in the pump cavity and stabilizing the water flow. The flow stabilizing structure has the advantages that the flow stabilizing structure is additionally arranged in the pump cavity and used for stabilizing irregular turbulent flow in the pump cavity, so that water flow in the pump cavity stably and regularly flows, local pressure accumulation is avoided or reduced, the purpose of reducing the pressure pulsation amplitude is achieved, vibration and noise are reduced, hydraulic loss is reduced, and the service life of the pump is prolonged. The hydraulic efficiency is favorably improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to the field of water pump especially pump with steady flow structure in pump cavity. BACKGROUND

[0002] Centrifugal pump is widely used in industry, city municipal life, production and other fields, with the improvement of user's environmental requirement, the requirement of vibration and noise generated when water pump operates is also higher and higher. Under normal working condition of centrifugal pump, blade passing frequency is one of the main ways to cause vibration and noise, blade passing frequency is mainly the periodic excitation force generated by the non-uniform outflow at impeller outlet caused by dynamic and static interference in centrifugal pump, blade passing frequency reflects on pressure pulsation in centrifugal pump, the amplitude of pressure pulsation generated by non-uniform outflow at impeller outlet not only produces vibration and noise, but also affects hydraulic efficiency, resulting in the reduction of hydraulic efficiency of centrifugal pump.

[0003] Such as the announcement number for CN110513326B Chinese invention patent "a centrifugal pump impeller of initiative control pressure pulsation", its disclosed technical scheme is: through the tail edge profile of the blade located at the outer edge of the rotary body one end is wave-shaped, and a plurality of guide grooves are arranged on the suction surface of the blade along the width direction of the blade, the strength of the shedding vortex is weakened through the blade, so that the pressure pulsation performance of the whole pump and the safety of pump operation are improved. The technical scheme mainly effectively inhibits the generation of pressure pulsation, but the impeller of the technical scheme has higher manufacturing process requirement, has higher production manufacturing cost, so that the technical scheme is difficult to popularize and apply. SUMMARY

[0004] The utility model aims at solving the above -mentioned problems existing in prior art and provides a pump with steady flow structure in pump cavity, adds steady flow structure in pump cavity, is used for the smooth pump cavity in irregular turbulence, makes the water flow in pump cavity present stable regularity flow, not only is favorable to avoid or reduce local pressure accumulation reaches the purpose of reducing pressure pulsation amplitude, thereby is favorable to reduce vibration and noise, also is favorable to reduce hydraulic loss, is favorable to improve hydraulic efficiency.

[0005] The utility model discloses a pump with a steady flow structure in the pump cavity, which comprises a pump body, an impeller arranged in a pump cavity of the pump body, a pump cover for closing an assembly opening of the pump cavity, and a motor with a rotating shaft penetrating through the pump cover and matched with the impeller.

[0006] As a further improvement and supplement to the above technical solution, the utility model adopts the following technical measures: the steady flow structure is arranged away from the water inlet of the impeller, the projection of the steady flow structure on the back cover plate of the impeller covers the back cover plate, and the steady flow structure is gap matched with the back cover plate of the impeller. The gap (or interval) between the flow baffle on the steady flow structure and the impeller is determined by the specific water requirement of the water pump. By adjusting the size of the gap, the peak value of pressure accumulation in the pump cavity can be adjusted, the hydraulic pressure distribution in the pump cavity can be optimized, and the purpose of smooth water flow can be achieved, thereby facilitating vibration reduction, noise reduction, and improvement of hydraulic efficiency.

[0007] As a preferred embodiment, the outer edge of the steady flow structure is gap matched with the corresponding inner wall of the pump cavity, and the inner edge of the steady flow structure is gap matched with the connecting sleeve on the impeller. This is conducive to stabilizing the water flow in the pump cavity, reducing disturbance, reducing vibration and noise, and guiding the water flow to the water outlet channel of the pump body.

[0008] As a preferred embodiment, the steady flow structure is an annular flow baffle, the inner end face of the pump cover is provided with a plurality of connecting columns, the flow baffle is fixed on the connecting columns through connecting pieces, and the area surrounded by the connecting columns and the flow baffle forms a cooling cavity. This technical solution is a structure of the steady flow structure, and the entire steady flow structure is in the form of a flat plate. The cooling cavity is arranged to enable the water flow in the pump cavity to circulate in the cooling cavity, lubricate and cool the mechanical seal on the rotating shaft, and improve the use reliability and service life of the mechanical seal.

[0009] As a preferred embodiment, the steady flow structure comprises an annular flow baffle and a flow ring wall standing on the periphery of the flow baffle, the outer edge of the flow ring wall is gap matched with the corresponding inner wall of the pump cavity, the shaft hole wall of the flow baffle is gap matched with the connecting sleeve on the impeller, and the flow baffle is gap matched with the back cover plate of the impeller. This technical solution is another structure of the steady flow structure, and the entire steady flow structure is in the form of a shell with one end open.

[0010] As preferred, the baffle is integrated with the baffle ring wall, the inner cavity surrounded by the baffle and the baffle ring wall is a cooling cavity, and a plurality of leakage holes are arranged on the baffle ring wall in a circumferential direction, and the leakage holes communicate the pump cavity and the cooling cavity. The entire flow stabilizing structure is integrated, which is beneficial to production, processing and assembly. The leakage holes are arranged to make the water in the pump cavity flow into the cooling cavity from the leakage holes, and the cooling cavity is arranged for the same purpose as described above.

[0011] As preferred, the leakage holes are arranged in an inclined manner, the leakage holes are gradually inclined from outside to inside in a direction from bottom to top, the outside opening of the leakage hole is lower than the inside opening of the leakage hole, and the included angle α between the vertical section of the leakage hole and the vertical section of the baffle ring wall is 30-60°. The arrangement of the leakage holes is beneficial to the unidirectional rotation of the water flow in the pump cavity into the cooling cavity, and the water in the cooling cavity flows in a ring shape under the driving of the rotating water flow, so that the water flowing into and out of the cooling cavity can still conform to the flow of the water in the pump cavity, avoiding hindering the flow of the water in the pump cavity, achieving the effects of cooling and lubricating the mechanical seal, ensuring the hydraulic performance of the water pump, and ensuring the efficiency of the water pump. The leakage holes can be linearly inclined or curvedly inclined (such as parabolic).

[0012] As preferred, the leakage holes are arranged in an inclined manner, the leakage holes are gradually inclined from outside to inside in a direction from bottom to top, the outside opening of the leakage hole is lower than the inside opening of the leakage hole, and the included angle α between the vertical section of the leakage hole and the vertical section of the baffle ring wall is 30-60°. The arrangement of the leakage holes is beneficial to the unidirectional rotation of the water flow in the pump cavity into the cooling cavity, and the water in the cooling cavity flows in a ring shape under the driving of the rotating water flow, so that the water flowing into and out of the cooling cavity can still conform to the flow of the water in the pump cavity, avoiding hindering the flow of the water in the pump cavity, achieving the effects of cooling and lubricating the mechanical seal, ensuring the hydraulic performance of the water pump, and ensuring the efficiency of the water pump. The leakage holes can be linearly inclined or curvedly inclined (such as parabolic).

[0013] As preferred, the leakage holes are arranged in an inclined manner, the leakage holes are gradually inclined from outside to inside in a direction from bottom to top, the outside opening of the leakage hole is lower than the inside opening of the leakage hole, and the included angle α between the vertical section of the leakage hole and the vertical section of the baffle ring wall is 30-60°. The arrangement of the leakage holes is beneficial to the unidirectional rotation of the water flow in the pump cavity into the cooling cavity, and the water in the cooling cavity flows in a ring shape under the driving of the rotating water flow, so that the water flowing into and out of the cooling cavity can still conform to the flow of the water in the pump cavity, avoiding hindering the flow of the water in the pump cavity, achieving the effects of cooling and lubricating the mechanical seal, ensuring the hydraulic performance of the water pump, and ensuring the efficiency of the water pump. The leakage holes can be linearly inclined or curvedly inclined (such as parabolic).

[0014] As preferred, the shaft is provided with a mechanical seal, the outer end of the mechanical seal is matched with the pump cover, the inner end of the mechanical seal is matched with the outer end of the connecting sleeve on the impeller, and the mechanical seal is matched with the cooling cavity in the flow stabilizing structure. The flow stabilizing structure is added in the pump cavity to maintain as much water flow in the pump cavity as possible in the area close to the water outlet passage on the pump body, which is beneficial to ensure the pump efficiency, and a small part of the water flow flows into the cooling cavity through the gap between the flow stabilizing structure and the surrounding components, which is used for lubricating and cooling the mechanical seal, and is beneficial to improve the working stability and service life of the mechanical seal.

[0015] The utility model has the beneficial effects that: 1, through setting up steady flow structure, it is favorable to limit the irregular turbulence of pump cavity to produce, makes the water flow in pump cavity present steady regularity flow, improves water flow and improves hydraulic efficiency, avoids or reduces local pressure accumulation and reduces pressure pulsation, realizes the purpose of noise reduction, vibration reduction. 2, the cooling cavity is formed between steady flow structure and mechanical seal, and the cooling cavity is a relatively independent cavity environment, makes the water in pump cavity enter the cooling cavity, and generates circulation under the one-way rotation of water flow in pump cavity, so that the mechanical seal can be cooled stably, and the influence on water pump hydraulic efficiency is reduced. 3, the steady flow structure is simple in structure, and the manufacturing and assembly difficulty is low, and the installation is convenient. 4, the steady flow structure is high in compatibility, is compatible with the existing water pump product, is applied to the existing water pump product to improve water pump performance, vibration reduction and noise reduction, and the cost of adding the steady flow structure is low, and the utility model is favorable to popularization and application. BRIEF DESCRIPTION OF DRAWINGS

[0016] Figure 1 It is a partial sectional view of the structure schematic drawing of the embodiment 2 of the utility model.

[0017] Figure 2 It is Figure 1 The enlarged structure schematic drawing of A part in it.

[0018] Figure 3 It is Figure 1 The structure schematic drawing of the steady flow structure in it.

[0019] Figure 4 It is Figure 3 The sectional view structure schematic drawing of the steady flow structure in it.

[0020] Figure 5 It is Figure 2 The partial structure schematic drawing in it.

[0021] Figure 6 It is a partial sectional view structure schematic drawing of the embodiment 1 in the utility model.

[0022] Figure 7 It is another partial sectional view structure schematic drawing of the embodiment 1 in the utility model.

[0023] Figure 8 It is Figure 6 The structure schematic drawing of part structure in it.

[0024] Figure 9 It is Figure 7 The structure schematic drawing of part structure in it.

[0025] Figure 10 It is another structure schematic drawing of the cooperation of pump cover and steady flow structure in the embodiment 1 in the utility model.

[0026] In the diagram: 1. Pump body; 2. Impeller; 3. Pump chamber; 4. Pump cover; 5. Shaft; 6. Motor; 7. Inlet; 8. Rear cover plate; 9. Baffle plate; 10. Connecting column; 11. Cooling chamber; 12. Baffle ring wall; 13. Connecting sleeve; 14. Drain hole; 15. Mechanical seal. Detailed Implementation

[0027] The technical solution of this utility model will be further described in detail below through embodiments and in conjunction with the accompanying drawings.

[0028] Example 1: As Figures 6-10 As shown, a pump with a flow stabilizing structure in the pump chamber includes a pump body 1, an impeller 2 disposed in a pump chamber 3 of the pump body 1, a pump cover 4 that closes the assembly port of the pump chamber 3, and a motor 6 with a rotating shaft 5 passing through the pump cover 4 and cooperating with the impeller 2. The pump chamber 3 is characterized by having a flow stabilizing structure, which is used to counteract disturbances in the water flow within the pump chamber 3 and stabilize the water flow.

[0029] In practical applications, the pump cover 4 can be a connector, which connects the motor 6 at one end and the pump body 1 at the other end, while also serving the function of the pump cover 4 to seal the assembly port on the pump chamber 3.

[0030] The main difference between this technical solution and existing technologies lies in the addition of a flow stabilizing structure in the pump chamber 3. This flow stabilizing structure smooths out the irregular turbulence within the pump chamber 3, ensuring a stable and regular flow of water. This not only helps avoid or reduce local pressure buildup, thus reducing pressure pulsation amplitude and consequently reducing vibration and noise, but also helps reduce hydraulic losses and improve hydraulic efficiency.

[0031] The above technical solution will then be explained in detail:

[0032] In practical applications, the flow stabilizing structure is positioned away from the inlet 7 of the impeller 2. The projection of the flow stabilizing structure onto the rear cover plate 8 covers the rear cover plate 8. The flow stabilizing structure and the rear cover plate 8 of the impeller 2 are fitted with a clearance d, which is the distance between the outer surface of the rear cover plate 8 of the impeller 2 at (R1+R2) / 2 and the baffle plate 9 on the flow stabilizing structure, where R1 is the outer diameter of the connecting sleeve 13 on the impeller 2 and R2 is the outer diameter of the impeller 2.

[0033] In practical applications, the size of the gap (or interval) between the baffle plate 9 and the impeller 2 on the flow stabilization structure is determined by the specific hydraulic requirements of the water pump. By adjusting the size of the gap, not only can the hydraulic requirements of the water pump be ensured, but also the peak value of the pressure accumulation in the pump chamber 3 can be adjusted to optimize the hydraulic pressure distribution in the pump chamber 3 and achieve the purpose of smooth water flow, which is beneficial to vibration reduction, noise reduction and hydraulic efficiency improvement.

[0034] In practical application, in order to further stabilize the water flow in the pump cavity 3, reduce disturbance, facilitate vibration reduction and noise reduction, and facilitate the water flow to the water outlet channel of the pump body 1, and also facilitate a part of the water flow to the mechanical seal 15, the water in the cooling cavity 11 can flow along the direction of the water flow in the pump cavity 3, for lubricating and cooling the mechanical seal 15, and also ensure the hydraulic performance of the water pump, the outer edge of the flow stabilizing structure is gap-fitted with the corresponding inner wall of the pump cavity 3, and the inner edge of the flow stabilizing structure is gap-fitted with the connecting sleeve 13 on the impeller 2.

[0035] In practical application, the flow stabilizing structure is a ring-shaped flow baffle 9, the inner end face of the pump cover 4 is provided with a plurality of connecting columns 10, the flow baffle 9 is fixed on the connecting columns 10 through connecting members, and the area surrounded by the connecting columns 10 and the flow baffle 9 forms a cooling cavity 11. The technical solution is a structure of the flow stabilizing structure, and the entire flow stabilizing structure is in the form of a flat plate. The cooling cavity 11 is arranged to enable the water flow in the pump cavity 3 to circulate in the cooling cavity 11, lubricate and cool the mechanical seal 15 on the rotating shaft 5, and facilitate to improve the use reliability and service life of the mechanical seal 15.

[0036] In the embodiment, the connecting columns 10 can be in an integral structure with the pump cover 4 (as shown in Figure 8 ), or in a split structure (as shown in Figure 9 and Figure 10 ). As shown in Figure 9 , when the connecting columns 10 are in a split structure, the connecting columns 10 are connected together through connecting members, and then the connecting columns 10 and the flow baffle 9 are connected together through another connecting member; or, as shown in Figure 10 , the connecting columns 10, the flow baffle 9 and the pump cover 4 are connected together through connecting members in sequence.

[0037] In practical application, the rotating shaft 5 is provided with the mechanical seal 15, the outer end of the mechanical seal 15 is fitted with the pump cover 4, the inner end of the mechanical seal 15 is fitted with the outer end of the connecting sleeve 13 on the impeller 2, and the mechanical seal 15 is fitted with the cooling cavity 11 in the flow stabilizing structure. The flow stabilizing structure is added in the pump cavity 3 to maintain as much as possible the water flow in the pump cavity 3 in the area near the water outlet channel on the pump body 1, which is conducive to ensuring the pump efficiency, and a small part of the water flow flows into the cooling cavity 11 through the gap between the flow stabilizing structure and the surrounding components, for lubricating and cooling the mechanical seal 15, which is conducive to improving the working stability and service life of the mechanical seal 15. Here, the "inner end" refers to the direction away from the pump cover 4, and the "outer end" refers to the direction towards the pump cover 4.

[0038] Embodiment 2: as shown in Figures 1-5As shown, in the embodiment, the flow stabilizing structure is in the shape of a cover with one end open.

[0039] Specifically, the difference from the embodiment 1 is that the flow stabilizing structure comprises a ring-shaped baffle 9, a baffle ring wall 12 standing on the periphery of the baffle 9, the outer edge of the baffle ring wall 12 is in gap fit with the corresponding inner wall of the pump cavity 3, the shaft hole wall of the baffle 9 is in gap fit with the connecting sleeve 13 on the impeller 2, and the baffle 9 is in gap fit with the back cover plate 8 of the impeller 2.

[0040] In actual application, in order to facilitate production and assembly, the baffle 9 and the baffle ring wall 12 are in an integrated structure, and the inner cavity surrounded by the baffle 9 and the baffle ring wall 12 is a cooling cavity 11.

[0041] In actual application, in order to enable the water in the pump cavity 3 to flow smoothly into the cooling cavity 11, the baffle ring wall 12 is provided with a plurality of leakage holes 14 arranged in a circumferential direction, and the leakage holes 14 communicate the pump cavity 3 and the cooling cavity 11. The purpose of the cooling cavity 11 is the same as that of the cooling cavity 11 in the embodiment 1.

[0042] In actual application, the leakage holes 14 are arranged in an inclined manner, the leakage holes 14 are inclined gradually from outside to inside in a direction from bottom to top and inside, the outside opening of the leakage holes 14 is lower than the inside opening of the leakage holes 14, and the included angle α between the vertical section of the leakage holes 14 and the vertical section of the baffle ring wall 12 is 30-60°. The leakage holes 14 can be inclined in a straight line or in a curved manner (such as in a parabolic shape).

[0043] The arrangement of the leakage holes 14 is beneficial to the unidirectional rotation of the water flow in the pump cavity 3 into the cooling cavity 11, and the water in the cooling cavity 11 flows in a ring shape under the driving of the rotating water flow, so that the water flowing into and out of the cooling cavity 11 can still conform to the flow of the water in the pump cavity 3, avoiding the obstruction of the water flow in the pump cavity 3, achieving the cooling and lubricating effect of the mechanical seal 15, and ensuring the hydraulic performance and efficiency of the water pump.

[0044] In actual application, the leakage holes 14 are in a structure of large outside and small inside, the outside opening of the leakage holes 14 is larger than the inside opening of the leakage holes 14, and the leakage holes 14 are smoothly transitioned from outside to inside. This is beneficial to further reducing the hydraulic loss in the pump cavity 3 and ensuring the efficiency of the water pump.

[0045] In actual application, the leakage holes 14 are in an arc-shaped long strip structure, and a plurality of the leakage holes 14 are arranged in a spiral shape on the baffle ring wall 12. This is beneficial to further reducing the hydraulic loss in the pump cavity 3 and ensuring the efficiency of the water pump.

[0046] 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 pump with a flow stabilizing structure in the pump chamber, comprising a pump body (1), an impeller (2) arranged in a pump chamber (3) of the pump body (1), a pump cover (4) closing the assembly opening of the pump chamber (3), and a motor (6) with a rotating shaft (5) passing through the pump cover (4) and cooperating with the impeller (2), characterized in that The pump cavity (3) is provided with a steady flow structure, which is in gap cooperation with the back cover plate (8) of the impeller (2); the steady flow structure is used to resist the disturbance of water flow in the pump cavity (3) and stabilize the water flow; The steady flow structure comprises an annular baffle (9) and a baffle ring wall (12) standing on the periphery of the baffle (9); the outer edge of the baffle ring wall (12) is in gap cooperation with the corresponding inner wall of the pump cavity (3); the shaft hole wall of the baffle (9) is in gap cooperation with the connecting sleeve (13) on the impeller (2); and the baffle (9) is in gap cooperation with the back cover plate (8) of the impeller (2).

2. The pump having a flow stabilizing structure in a pump chamber according to claim 1, characterized in that The steady flow structure is arranged away from the water inlet (7) of the impeller (2), and the projection of the steady flow structure on the back cover plate (8) of the impeller (2) covers the back cover plate (8).

3. The pump having a flow stabilizing structure in a pump chamber according to claim 2, characterized in that The inner edge of the steady flow structure is in gap cooperation with the connecting sleeve (13) on the impeller (2), and the outer edge of the steady flow structure is in gap cooperation with the corresponding inner wall of the pump cavity (3).

4. The pump having a flow stabilizing structure in a pump chamber according to claim 3, characterized in that The steady flow structure is an annular baffle (9), the inner end face of the pump cover (4) is provided with a plurality of connecting columns (10), the baffle (9) is fixed on the connecting columns (10) through connecting members, and the area surrounded by the connecting columns (10) and the baffle (9) forms a cooling cavity (11).

5. The pump having a flow stabilizing structure in the pump chamber according to claim 4, characterized in that The baffle (9) and the baffle ring wall (12) are an integral structure, the inner cavity surrounded by the baffle (9) and the baffle ring wall (12) is a cooling cavity (11), a plurality of flow discharge holes (14) are arranged in the circumferential direction of the baffle ring wall (12), and the flow discharge holes (14) communicate the pump cavity (3) and the cooling cavity (11).

6. The pump having a flow stabilizing structure in the pump chamber according to claim 5, characterized in that The flow discharge holes (14) are inclined, the flow discharge holes (14) gradually incline from outside to inside, the outer opening of the flow discharge holes (14) is lower than the inner opening of the flow discharge holes (14), and the included angle α between the vertical section of the flow discharge holes (14) and the vertical section of the baffle ring wall (12) is 30-60°.

7. The pump having a flow stabilizing structure in the pump chamber according to claim 6, characterized in that The flow discharge holes (14) have an outer large and inner small structure, the outer opening of the flow discharge holes (14) is larger than the inner opening of the flow discharge holes (14), and the flow discharge holes (14) smoothly transition from outside to inside.

8. The pump having a flow stabilizing structure in the pump chamber according to claim 7, characterized in that The flow discharge holes (14) have an arc-shaped long strip structure, and a plurality of the flow discharge holes (14) are arranged in a spiral shape on the baffle ring wall (12).

9. The pump having a flow stabilizing structure in the pump chamber according to claim 5, characterized by The rotating shaft (5) is provided with a mechanical seal (15), the outer end of the mechanical seal (15) cooperates with the pump cover (4), the inner end of the mechanical seal (15) cooperates with the outer end of the connecting sleeve (13) on the impeller (2), and the mechanical seal (15) cooperates with the cooling cavity (11) in the steady flow structure.

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