Low noise centrifugal pump for petrochemical industry

Abstract

This utility model discloses a low-noise centrifugal pump for petrochemical applications, comprising a centrifugal pump body, an impeller movably mounted inside the pump body with an impeller shaft mounted on it, an inlet pipe at the front of the pump body, a drain pipe at the top of the pump body, and a low-noise mechanism wrapped around the outside of the pump body. The low-noise mechanism consists of noise reduction covers A, B, C, and D. Noise reduction cover B is fixedly mounted at one end of noise reduction cover A, and noise reduction cover D is fixedly mounted at one end of noise reduction cover C. This low-noise centrifugal pump for petrochemical applications features modularly designed noise reduction covers that can be quickly installed using a mounting bracket without complex tools or specialized skills, reducing the noise level generated by the centrifugal pump and preventing damage to the inner ear hair cells of factory workers, thus avoiding irreversible hearing loss. The rock wool itself has a porous fiber structure, primarily absorbing mid-to-high frequency noise.

Description

Technical Field

[0001] This utility model relates to the field of chemical equipment, specifically a low-noise centrifugal pump for petrochemical applications. Background Technology

[0002] Centrifugal pumps work by using the rotation of an impeller to cause water to move centrifugally. Chemical pumps refer to pumps that meet the special requirements of chemical production: (1) meeting the needs of chemical processes, (2) resisting high and low temperatures, (3) resisting corrosion, (4) resisting wear, (5) minimizing or eliminating leakage, and (6) being able to transport liquids in critical states. Currently, driven by huge oil demand, the central and eastern regions of my country and coastal areas have become the fastest-growing regional markets for the pump industry. As my country further increases its investment in water treatment, coal chemical industry, and urban infrastructure, the pump industry will benefit again. Corrosion has always been one of the most troublesome hazards to chemical equipment. Slight negligence can damage equipment, cause accidents, or even lead to disasters. Therefore, when selecting centrifugal pumps, in addition to process parameters such as head, flow rate, and pressure, corrosion resistance, reliability, and maintainability are also issues that need to be considered.

[0003] To solve the above problems, after searching, Chinese patent with publication number CN106762803A was found, which discloses a high-performance petrochemical centrifugal pump. The pump includes a pump body, impeller, packing seal, bearing body, and pump shaft. The impeller is located inside the pump body and is fixed to the left end of the pump shaft by an impeller nut. A retaining washer is provided between the impeller and the impeller nut. The suction section is located on the left side of the pump body.

[0004] While the aforementioned devices can prevent the transported particulate media from entering the sealed cavity and reduce axial force, thus alleviating the burden on the sealed cavity, in actual use, chemical plant workers are exposed to noise levels above 85 dB(A) for extended periods. For example, the noise of centrifugal pumps often reaches 90-110 dB(A), which may cause damage to the hair cells in the inner ear and lead to irreversible hearing loss. For instance, if the noise level exceeds 90 dB(A) during continuous 8-hour operation in the pump room, the risk of hearing damage increases significantly. Utility Model Content

[0005] The purpose of this invention is to provide a low-noise centrifugal pump for petrochemical applications, in order to address the deficiencies mentioned in the background section.

[0006] To achieve the above objectives, a low-noise centrifugal pump for petrochemical applications is provided, comprising a centrifugal pump body, an impeller movably disposed inside the centrifugal pump body, an impeller shaft mounted on the impeller, an inlet pipe mounted at the front of the centrifugal pump body, a drain pipe mounted at the top of the centrifugal pump body, and a low-noise mechanism wrapped around the outside of the centrifugal pump body. The low-noise mechanism consists of a noise reduction cover A, a noise reduction cover B, a noise reduction cover C, and a noise reduction cover D. Noise reduction cover B is fixedly mounted at one end of noise reduction cover A, and noise reduction cover D is fixedly mounted at one end of noise reduction cover C.

[0007] Preferably, the noise reduction cover A and noise reduction cover B have the same structure, are semi-circular in shape, and have four sets of fixing seats evenly installed on them. The adjacent sets of fixing seats are fixed together by bolts.

[0008] Preferably, both noise reduction cover A and noise reduction cover B are equipped with a mounting bracket on their inner walls, which is snapped onto the centrifugal pump body and fixed with bolts;

[0009] Preferably, the noise reduction cover C and the noise reduction cover D have the same structure. The noise reduction cover C and the noise reduction cover D are semi-circular. Four sets of fixing seats are evenly installed on the noise reduction cover C and the noise reduction cover D. The adjacent sets of fixing seats are fixed together by bolts.

[0010] Preferably, the noise reduction cover A includes a front noise reduction cover, a cover A and a first docking piece, and the noise reduction cover C includes a rear noise reduction cover, a cover B and a second docking piece, with both cover A and cover B being semi-circular.

[0011] Preferably, three sets of second mating pieces are evenly welded to the end of the cover B, and three sets of first mating pieces are evenly welded to the end of the cover A. Both the second and first mating pieces are arc-shaped, and two sets of through holes are evenly opened on the second and first mating pieces. The second and first mating pieces are fixed together by two sets of bolts.

[0012] Preferably, sound-absorbing seats B are bonded and fixed on the inner walls of both the front and rear noise-reducing covers, and sound-absorbing seats A are fixedly installed on the inner circumference of the cover A. Both sound-absorbing seats A and B are made of rock wool boards, and multiple sets of circular sound-absorbing holes are evenly opened on sound-absorbing seats A and B.

[0013] Compared with the prior art, the beneficial effects of this utility model are:

[0014] 1. This utility model uses noise reduction covers A, B, C, and D to cover the centrifugal pump body from multiple directions. Combined with the sound-absorbing materials of the internal sound-absorbing bases A and B, it can form a multi-layered sound barrier from the outside of the sound source, effectively blocking the transmission of noise from different directions and improving the overall noise reduction efficiency. The card-fixing method ensures that the noise reduction covers are not easy to loosen when the pump body is running. The modular design of the noise reduction covers can be quickly installed through the card, without complicated tools or professional technology, reducing the decibels of noise generated by the centrifugal pump and avoiding damage to the inner ear hair cells of factory workers, which may lead to irreversible hearing loss.

[0015] 2. In this utility model, both sound-absorbing base A and sound-absorbing base B are made of rock wool boards, and multiple sets of circular sound-absorbing holes are evenly opened on sound-absorbing base A and sound-absorbing base B. Rock wool itself has a porous fiber structure, which mainly absorbs mid-to-high frequency noise. The evenly distributed circular holes combined with the rock wool board form a structure similar to a "Helmholtz resonator". When sound waves enter the holes, the air column vibrates at the neck of the hole and consumes energy through friction with the rock wool fibers. This can specifically enhance low-frequency sound absorption, such as structural sound transmission caused by pump body vibration, making the noise reduction frequency band wider. Attached Figure Description

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

[0017] Figure 2 for Figure 1 Rear view;

[0018] Figure 3 for Figure 1 Top view;

[0019] Figure 4 for Figure 1 A partial structural diagram;

[0020] Figure 5 This is a schematic diagram of the front noise reduction cover and its internal structure of the present invention.

[0021] Figure 6 for Figure 5 Side view;

[0022] Figure 7 for Figure 5 Top view.

[0023] Numbered in the diagram: 1. Centrifugal pump body; 2. Impeller shaft; 3. Drain pipe; 4. Noise reduction mechanism; 41. Front noise reduction cover; 4111. Sound-absorbing seat A; 4112. Sound-absorbing seat B; 411. Noise reduction cover A; 412. Noise reduction cover B; 42. Cover A; 43. First docking piece; 44. Rear noise reduction cover; 441. Noise reduction cover C; 442. Noise reduction cover D; 443. Fixing base; 45. Cover B; 46. Second docking piece; 47. Card slot. Detailed Implementation

[0024] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0025] Please see Figure 1-7 This utility model provides a low-noise centrifugal pump for petrochemical applications, including a centrifugal pump body 1. An impeller is movably arranged inside the centrifugal pump body 1, and an impeller shaft 2 is installed on the impeller. A water inlet pipe is installed at the front of the centrifugal pump body 1, and a drain pipe 3 is installed at the top of the centrifugal pump body 1. A low-noise mechanism 4 is wrapped around the outside of the centrifugal pump body 1. The low-noise mechanism 4 is composed of a noise reduction cover A411, a noise reduction cover B412, a noise reduction cover C441, and a noise reduction cover D442. A noise reduction cover B412 is fixedly installed at one end of the noise reduction cover A411, and a noise reduction cover D442 is fixedly installed at one end of the noise reduction cover C441.

[0026] Working Principle: In actual use, noise reduction covers A411 and B412 are installed on one side of the centrifugal pump body 1, and noise reduction covers C441 and D442 are installed on the other side. These are fixedly mounted on the centrifugal pump body 1 using mounting brackets 47, ensuring the stability of noise reduction covers A411, B412, C441, and D442 during operation and preventing loosening. Simultaneously, each of the noise reduction covers A411, B412, C441, and D442 contains sound-absorbing seats A4111 and B4112, which absorb sound and reduce noise during the operation of the centrifugal pump body 1. The noise reduction covers A411, B412, C441, and D442 are equipped with sound-absorbing seats A4111 and B4112 inside, which can absorb sound and reduce noise during the operation of the centrifugal pump body 1. 442 provides multi-directional coverage from the centrifugal pump body 1, and combined with the sound-absorbing materials of the internal sound-absorbing seats A4111 and B4112, it can form a multi-layer sound barrier from the outside of the sound source, effectively blocking the transmission of noise from different directions and improving the overall noise reduction efficiency; the fixing method of the bracket 47 ensures that the noise reduction cover is not easy to loosen when the pump body is running, avoiding component displacement or noise amplification due to vibration, and ensuring stability and safety in long-term use; the modular design of the noise reduction cover can be quickly installed through the bracket 47 without complicated tools or professional technology, and a single noise reduction cover can be disassembled for inspection or replacement of sound-absorbing materials during later maintenance without affecting the operation of the overall equipment; reducing the decibels of noise generated by the centrifugal pump, avoiding damage to the inner ear hair cells of factory workers and causing irreversible hearing loss;

[0027] Both sound-absorbing bases A4111 and B4112 are rock wool boards, with multiple sets of evenly distributed circular sound-absorbing holes. Rock wool itself has a porous fiber structure, mainly absorbing mid-to-high frequency noise, with a sound absorption coefficient typically between 0.7 and 0.9. The evenly distributed circular holes, combined with the rock wool board, form a structure similar to a "Helmholtz resonator." When sound waves enter the holes, the air column vibrates at the hole neck, rubbing against the rock wool fibers to dissipate energy, which can specifically enhance low-frequency sound absorption, such as structural sound transmission caused by pump vibration, thus widening the noise reduction frequency band. The circular holes increase the reflection and refraction paths of sound waves inside the rock wool, allowing more sound energy to be absorbed by the fibers and converted into heat energy, improving sound absorption efficiency. The porous structure disperses sound wave energy to different directions and frequencies, avoiding sound absorption saturation caused by local energy concentration, and improving the overall noise reduction effect.

[0028] As a preferred embodiment, the noise reduction cover A411 and the noise reduction cover B412 have the same structure. The noise reduction cover A411 and the noise reduction cover B412 are semi-circular. Four sets of fixing seats 443 are evenly installed on the noise reduction cover A411 and the noise reduction cover B412. The adjacent sets of fixing seats 443 are fixed together by bolts.

[0029] As a preferred embodiment, both noise reduction cover A411 and noise reduction cover B412 are equipped with a mounting bracket 47, which is snapped onto the centrifugal pump body 1 and fixed with bolts.

[0030] As a preferred embodiment, the noise reduction cover C441 and the noise reduction cover D442 have the same structure. The noise reduction cover C441 and the noise reduction cover D442 are semi-circular. Four sets of fixing seats 443 are evenly installed on the noise reduction cover C441 and the noise reduction cover D442. The adjacent sets of fixing seats 443 are fixed together by bolts.

[0031] In a preferred embodiment, the noise reduction cover A411 includes a front noise reduction cover 41, a cover A42 and a first docking piece 43, and the noise reduction cover C441 includes a rear noise reduction cover 44, a cover B45 and a second docking piece 46. Both the cover A42 and the cover B45 are semi-circular.

[0032] In a preferred embodiment, three sets of second mating pieces 46 are evenly welded to the end of cover B45, and three sets of first mating pieces 43 are evenly welded to the end of cover A42. Both the second mating pieces 46 and the first mating pieces 43 are arc-shaped. Two sets of through holes are evenly opened on the second mating pieces 46 and the first mating pieces 43. The second mating pieces 46 and the first mating pieces 43 are fixed together by two sets of bolts.

[0033] In a preferred embodiment, sound-absorbing seats B4112 are bonded and fixed to the inner walls of both the front noise-reducing cover 41 and the rear noise-reducing cover 44, and sound-absorbing seats A4111 are fixedly provided on the inner circumference of the cover A42. Both sound-absorbing seats A4111 and B4112 are made of rock wool board, and multiple sets of circular sound-absorbing holes are evenly opened on sound-absorbing seats A4111 and B4112.

[0034] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A low-noise centrifugal pump for petrochemical applications, comprising a centrifugal pump body (1), characterized in that: The centrifugal pump body (1) is equipped with an impeller inside, and an impeller shaft (2) is installed on the impeller. A water inlet pipe is installed at the front of the centrifugal pump body (1), and a drain pipe (3) is installed at the top of the centrifugal pump body (1). A low-noise mechanism (4) is wrapped around the outside of the centrifugal pump body (1). The low-noise mechanism (4) consists of a noise reduction cover A (411), a noise reduction cover B (412), a noise reduction cover C (441), and a noise reduction cover D (442). A noise reduction cover B (412) is fixedly installed at one end of a noise reduction cover A (411), and a noise reduction cover D (442) is fixedly installed at one end of a noise reduction cover C (441).

2. The low-noise centrifugal pump for petrochemical applications according to claim 1, characterized in that: The noise reduction cover A (411) and noise reduction cover B (412) have the same structure. The noise reduction cover A (411) and noise reduction cover B (412) are semi-circular. Four sets of fixing seats (443) are evenly installed on the noise reduction cover A (411) and noise reduction cover B (412). The adjacent sets of fixing seats (443) are fixed together by bolts.

3. The low-noise centrifugal pump for petrochemical applications according to claim 2, characterized in that: Both noise reduction cover A (411) and noise reduction cover B (412) are equipped with a bracket (47) on their inner walls. The bracket (47) is snapped onto the centrifugal pump body (1) and fixed with bolts.

4. A low-noise centrifugal pump for petrochemical applications according to claim 1, characterized in that: The noise reduction cover C (441) and noise reduction cover D (442) have the same structure. The noise reduction cover C (441) and noise reduction cover D (442) are semi-circular. Four sets of fixing seats (443) are evenly installed on the noise reduction cover C (441) and noise reduction cover D (442). The adjacent sets of fixing seats (443) are fixed together by bolts.

5. A low-noise centrifugal pump for petrochemical applications according to claim 2, characterized in that: The noise reduction cover A (411) includes a front noise reduction cover (41), a cover A (42) and a first docking piece (43), and the noise reduction cover C (441) includes a rear noise reduction cover (44), a cover B (45) and a second docking piece (46). Both the cover A (42) and the cover B (45) are semi-circular.

6. A low-noise centrifugal pump for petrochemical applications according to claim 5, characterized in that: The end of the cover B (45) is uniformly welded with three sets of second mating pieces (46), and the end of the cover A (42) is uniformly welded with three sets of first mating pieces (43). The second mating pieces (46) and the first mating pieces (43) are both arc-shaped. Two sets of through holes are uniformly opened on the second mating pieces (46) and the first mating pieces (43). The second mating pieces (46) and the first mating pieces (43) are fixed together by two sets of bolts.

7. A low-noise centrifugal pump for petrochemical applications according to claim 5, characterized in that: The inner walls of the front noise reduction cover (41) and the rear noise reduction cover (44) are both bonded and fixed with sound-absorbing seats B (4112), and the inner walls of the cover A (42) are both fixed with sound-absorbing seats A (4111). Both sound-absorbing seats A (4111) and sound-absorbing seats B (4112) are made of rock wool boards, and multiple sets of circular sound-absorbing holes are evenly opened on sound-absorbing seats A (4111) and sound-absorbing seats B (4112).

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