阅读说明：本技术 一种双口环密封的自吸排污泵 (Self-suction sewage pump with double-opening ring seal ) 是由 吴登昊 任芸 谷云庆 周佩剑 徐茂森 牟介刚 于 2019-08-28 设计创作，主要内容包括：一种双口环密封的自吸排污泵,包括吸水室、带有切割刀片的叶轮、带有切割槽的前密封环、带有切割槽的后泵盖、机械密封、回流孔、泵体、气液分离室、泵轴和轴承体,带有切割刀片的叶轮安装于泵轴上,通过带有切割槽的后泵盖和轴承体与泵体相连,所述叶轮前后盖板边缘处,相隔360°/n均匀分布切割刀片,每个盖板上共有刀片n组,n为偶数,刀片的刀口朝向与叶轮旋转方向一致,前密封环和后泵盖为静止部件,在其内侧边缘处开设n个均匀分布的切割槽。本发明解决了自吸排污泵口环处易卡死和机封易磨损问题,同时,叶轮的双道口环密封型式,大大减少了高压流体从叶轮出口处回流至叶轮进口的液体流量,减小了能量的损失,提高了泵的效率。(The utility model provides a sealed from inhaling dredge pump of dual-ported ring, includes suction chamber, the impeller that has cutting blade, the preceding sealing ring that has the cutting groove, the back pump cover that has the cutting groove, mechanical seal, backward flow hole, the pump body, gas-liquid separation room, pump shaft and bearing body, the impeller that has cutting blade installs on the pump shaft, links to each other with the pump body through the back pump cover that has the cutting groove and bearing body, apron edge around the impeller, 360/n evenly distributed cutting blades are separated by, and the total blade n group on every apron, n are the even number, and the edge of a knife of blade orientation is unanimous with the impeller direction of rotation, and preceding sealing ring and back pump cover are static part, and the edge department sets up n evenly distributed cutting groove in its inboard edge. The invention solves the problems of easy blocking at the mouth ring of the self-suction sewage pump and easy abrasion of a mechanical seal, and simultaneously, the double-channel mouth ring sealing type of the impeller greatly reduces the liquid flow of high-pressure fluid which flows back from the outlet of the impeller to the inlet of the impeller, reduces the energy loss and improves the efficiency of the pump.)

1. The utility model provides a sealed from inhaling dredge pump of two mouthfuls of rings, its characterized in that, from inhaling dredge pump structure include suction chamber, the impeller that has cutting blade, the preceding sealing ring that has the cutting groove, the back pump cover that has the cutting groove, mechanical seal, backward flow hole, the pump body, gas-liquid separation room, pump shaft and bearing body, the impeller that has cutting blade is installed on the pump shaft, links to each other with the pump body through the back pump cover that has the cutting groove and bearing body, the front shroud and the back shroud edge that have cutting blade impeller, 360 degrees/n evenly distributed cutting blades of being separated by, total blade n group on every apron, n is the even number, and the edge orientation of blade is unanimous with the impeller direction of rotation, and preceding sealing ring and back pump cover are static parts, set up n evenly distributed cutting groove in its inboard edge department.

2. The self-priming sewage pump with double-ported ring seal as claimed in claim 1, wherein the sealing clearance between the front and rear cover plates of the impeller and the front and rear seal rings and the rear pump cover is controlled to be 0.2mm to 0.3 mm; meanwhile, a first sealing structure is formed at the position of the front cover plate of the impeller and the front sealing ring, the position of the rear cover plate of the impeller and the position of the rear pump cover, and a second sealing structure is formed at the position of the inlet of the impeller and the position of the opening ring of the pump body, so that a double-sealing structure of the self-priming sewage pump is realized.

3. The self-priming sewage pump with a double-ported ring seal as defined in claim 1 or 2, wherein the cutting blades on the front cover plate and the rear cover plate of the impeller are of a saw-tooth structure.

4. The self-priming sewage pump with the double-mouth ring seal as claimed in claim 3, wherein the radial section of the cutting groove is a trapezoidal opening, the upper bottom is 9mm, the lower bottom is 6mm, and the height is 6 mm; the axial depth of the groove was 6 mm.

5. The self-priming sewage pump with a double-ported ring seal as claimed in claim 1 or 2, wherein the cutting blades on the front cover plate and the rear cover plate of the impeller are oval blades or wedge-shaped blades.

6. The self-priming sewage pump with a double-ported ring seal as recited in claim 5, wherein said cutting groove has a square or semicircular cross section; the length of the side of the square section is 8mm, and the depth of the groove is 6 mm; the diameter length of the semicircular section is 6mm, and the depth of the groove is 6 mm.

7. The self-priming sewage pump with a double-ported ring seal as recited in claim 1 or 2 wherein said blade is a replaceable blade structure.

8. The self-priming sewage pump with double-ported ring seal as claimed in claim 1 or 2, characterized in that a spiral groove is formed at the mechanical seal cavity.

Technical Field

The invention relates to a self-priming sewage pump with double-port ring seal, which belongs to the technical field of fluid machinery and is mainly used for solving the problems that a self-priming sewage pump port ring is easy to block and a machine seal is easy to wear, ensuring the stable and reliable operation of the pump and improving the working efficiency of the pump.

Background

The self-suction pollution discharge type centrifugal pump has the advantages of compact structure, small occupied area, convenient installation and maintenance, stable operation, long continuous operation time, long service life, no problem of water filling and diversion and the like, thereby being widely applied to various industries. Due to the particularity of the working environment of the self-priming sewage pump, the structure of the self-priming sewage pump needs to be improved in order to prevent fibers, impurities and the like in the conveying medium from blocking the impeller and the mouth ring. According to the Chinese patent No. CN109505775A, a three-stage cutting structure is adopted, wherein a lower cutting edge and a cutting knife form a first-stage cutting mechanism, an upper cutting edge and an impeller edge form a second-stage cutting mechanism, and a blade edge and a pump body inclined plane form a third-stage cutting structure. In order to reduce the liquid flow rate of high-pressure fluid flowing back from the outlet of the impeller to the inlet of the impeller and reduce the energy loss, a front sealing mechanism is arranged at the pumping inlet of the pump in Chinese patent No. CN 108223422A. However, the structure can only reduce the leakage between the impeller and the pump body opening ring, the leakage between the impeller front cover plate and the pump body and between the impeller rear cover plate and the pump cover cannot be effectively controlled, and the energy loss of the whole pump caused by liquid leakage is still large.

Disclosure of Invention

Aiming at the technical problem of the self-priming sewage pump, the invention provides the self-priming sewage pump with the double-opening ring seal, which has the advantages of simple structure, convenient manufacture and installation, effective realization of cutting of fiber impurities, reduction of the leakage amount of the pump, and flexible adjustment of the number of cutting blades on the front cover plate and the rear cover plate of the impeller according to the content of the impurities.

The technical scheme adopted by the invention for solving the technical problems is as follows:

The utility model provides a sealed from inhaling dredge pump of two mouthfuls of rings, from inhaling dredge pump includes suction chamber, the impeller that has cutting blade, the preceding sealing ring that has the cutting groove, the back pump cover that has the cutting groove, mechanical seal, backward flow hole, the pump body, gas-liquid separation room, pump shaft and bearing body, and the impeller that has cutting blade is installed on the pump shaft, links to each other with the pump body through the back pump cover that has the cutting groove and bearing body, the front shroud and the back shroud edge that have cutting blade impeller are 360/n evenly distributed cutting blade at intervals, and total blade n group is gone up to every apron, and n is the multiple of even number (2 and 2), and the edge of a knife orientation of blade is unanimous with the impeller direction of rotation, and preceding sealing ring and back pump cover are static part, set up n evenly distributed cutting groove in.

furthermore, the sealing gaps between the front cover plate and the rear cover plate of the impeller and between the front sealing ring and the rear pump cover are controlled to be 0.2mm to 0.3 mm; meanwhile, a first sealing structure is formed at the position of the front cover plate of the impeller and the front sealing ring, the position of the rear cover plate of the impeller and the position of the rear pump cover, and a second sealing structure is formed at the position of the inlet of the impeller and the position of the opening ring of the pump body, so that a double-sealing structure of the self-priming sewage pump is realized.

Still further, the cutting blades on the front cover plate and the rear cover plate of the impeller are of a sawtooth structure. The blade is made of hard alloy, is hardened, has good corrosion resistance and high hardness, and improves the reliability of the blade in the severe environment containing impurity fluid; according to the content of impurities in the conveying medium, blades at the edges of the front cover plate and the rear cover plate of the impeller can be uniformly processed into four groups, six groups, eight groups and ten groups; the cutting grooves on the front sealing ring and the rear pump cover plate corresponding to the cutting grooves are processed into the same groups so as to realize effective cutting.

Preferably, the radial section of the cutting groove is a trapezoidal opening, the upper bottom is 9mm, the lower bottom is 6mm, and the height is 6 mm; the axial depth of the groove was 6 mm.

Or the following steps: the cutting blades on the front cover plate and the rear cover plate of the impeller can be oval cutter heads, so that the contact area between the cutting blades and fiber impurities is increased, and the crushing performance is improved; the wedge-shaped blade can also be adopted, and the ascending wedge-shaped structure is beneficial to quickly discharging the cut impurities and preventing the cut impurities from being wound on the cutter head.

The cutting groove is not limited to a trapezoidal section, and can adopt structures such as a square structure, a semicircular structure and the like; the length of the side of the square section is 8mm, and the depth of the groove is 6 mm; the diameter length of the semicircular section is 6mm, and the depth of the groove is 6 mm.

The blade can be designed into a replaceable blade structure, and after the pump runs for a period of time, the abrasion condition of the cutter head is judged by observing the sizes of fibers and particles in a medium discharged by the self-sucking pump, so that the cutter head is replaced; the shape and the number of the blades are reasonably selected according to different impurity contents of the conveying medium.

A spiral groove is formed in the mechanical seal cavity; when fine particle impurities flow through the mechanical seal cavity, the particles are discharged out of the pump body along the spiral groove, so that the particles are prevented from entering the mechanical seal device, and the service life of the mechanical seal device is prolonged.

In the invention, when the impeller rotates, the impeller can suck fibrous particles into the flow channel inside the impeller, and as fibrous impurities enter the pump cavity, because the pressure at the opening ring and the mechanical seal is lower than the pressure in the pump cavity at the outlet of the impeller, the impurities can enter the front cover plate and the front seal ring of the impeller and the gap between the rear cover plate of the impeller and the rear pump cover under the action of pressure difference, at the moment, blades on the front cover plate and the rear cover plate of the impeller can be matched with the cutting grooves on the front seal ring and the rear pump cover, so that the fibrous impurities are cut.

The invention has the following beneficial effects: the problem of easily blocking and the machine seals easy wearing and tearing of self-priming dredge pump choma department is solved, simultaneously, the two pass choma seal type of impeller, the liquid flow that the high-pressure fluid flows back to the impeller import from the impeller exit has significantly reduced, has reduced the loss of energy, has improved the efficiency of pump.

Drawings

Fig. 1 is a schematic structural view of a double-ported ring seal self-priming sewage pump with a cutting impeller.

Fig. 2 is a schematic view of the structure of an impeller with cutting blades.

Fig. 3 is a schematic view of a replaceable blade.

Fig. 4 is a structural schematic diagram of a rear cover plate of the impeller provided with blades.

FIG. 5 is a schematic view of a seal ring with a cut groove.

Fig. 6 is a schematic view of a rear pump cap with a cut-out groove.

Fig. 7 is a schematic diagram of a spiral groove.

FIG. 8 is a schematic view of a pump return orifice configuration.

Detailed Description

The invention is further described below with reference to the accompanying drawings.

Referring to fig. 1 to 8, the self-priming sewage pump with double-collar seal comprises a water suction chamber (1), an impeller (2) with a cutting blade, a front sealing ring (3) with a cutting groove, a rear pump cover (4) with a cutting groove, a mechanical seal (5), a pump body (6), a gas-liquid separation chamber (7), a bearing body (8), a pump shaft (9) and a backflow hole (10); cutting blades (14) are uniformly distributed at the edges of a front cover plate (11) and a rear cover plate (12) of the impeller (2) at intervals of 90 degrees, and each cover plate is provided with 4 groups of blades; the knife edge of the blade is consistent with the rotation direction of the impeller, the front sealing ring and the rear pump cover are static parts, and 4 cutting grooves (17) which are uniformly distributed are formed in the inner side edge of the front sealing ring and the rear pump cover; when the impeller rotates, the impeller can suck fibrous particles into an inner flow channel of the impeller, and as fibrous impurities enter a pump cavity, because the pressure at the opening ring and the mechanical seal is lower than the pressure in a volute at the outlet of the impeller, the impurities can enter the impeller, the front seal ring and a gap between the impeller and the rear pump cover under the action of pressure difference, at the moment, blades on the front cover plate and the rear cover plate of the impeller can be matched with cutting grooves on the front seal ring and the rear pump cover to cut the fibrous impurities; the sealing gaps between the front cover plate and the rear cover plate of the impeller and between the front sealing ring and the rear pump cover are controlled to be 0.2mm to 0.3 mm; meanwhile, a first sealing structure is formed at the position of the front impeller cover plate and the front sealing ring, the position of the rear impeller cover plate and the position of the rear pump cover, and a second sealing structure at the position of the impeller inlet and the pump body opening ring is added, so that the double-sealing structure of the self-priming sewage pump is realized.

FIG. 2 is a schematic structural view of a self-priming pump impeller with cutting blades, wherein the cutting blades on a front cover plate and a rear cover plate of the impeller are of a sawtooth structure, the blades are made of hardened materials, the corrosion resistance is good, the hardness is high, and the reliability of the blades in operation in a severe environment containing impurity fluid is improved; according to the content of impurities in a conveying medium, blades at the edges of the front cover plate and the rear cover plate of the impeller can be uniformly processed into six groups, eight groups and ten groups; the cutting blade can be an elliptical cutter head, so that the contact area of the cutting blade and fiber impurities is increased, and the crushing performance is improved; the wedge-shaped blade can also be adopted, and the ascending wedge-shaped structure is beneficial to quickly discharging the cut impurities and preventing the cut impurities from being wound on the cutter head. Fig. 3 is a schematic view of a replaceable blade, and an M4 threaded hole (16) is formed in the blade (14) for fixing the blade to the impeller. FIG. 4 is a schematic structural view of a rear cover plate of an impeller with blades, wherein four grooves are uniformly distributed at the edges of the front cover plate and the rear cover plate of the impeller and used for fixedly mounting the blades; m4 threaded holes (16) are formed in the grooves and the replaceable blades, the blades are fixed on the impeller through M4 double-headed screws (15), and after the pump runs for a period of time, the abrasion condition of the cutter head is judged by observing the size of fibers and particles in a medium discharged from the self-priming pump, so that the cutter head is replaced; the shape and the number of the blades are reasonably selected according to different impurity contents of the conveying medium.

Fig. 5 is a schematic view of a sealing ring with a cutting groove, wherein 4 uniformly distributed through holes (18) with a diameter of phi 5.5mm are arranged on the sealing ring, 4 uniformly distributed M5 threaded holes are arranged at a front cover plate of the pump, and the sealing ring is fixed on the front cover plate of the pump through M5 hexagon socket head cap screws. Fig. 6 is a schematic diagram of a rear pump cover with cutting grooves, and in combination with fig. 5 and 6, the number of groups of cutting grooves machined on the sealing ring and the rear pump cover is consistent with the number of blades on the impeller, so as to achieve effective cutting; the radial section of the cutting groove is a trapezoidal opening, the upper bottom is 9mm, the lower bottom is 6mm, and the height is 6 mm; the axial depth of the groove is 6 mm; the cutting groove is not limited to a trapezoidal section, and can adopt structures such as a square structure, a semicircular structure and the like; the length of the side of the square section is 8mm, and the depth of the groove is 6 mm; the diameter length of the semicircular section is 6mm, and the depth of the groove is 6 mm.

FIG. 7 is a schematic view of a spiral groove formed in the mechanical seal cavity, wherein when fine particle impurities flow through the mechanical seal cavity, particles are discharged out of the pump body along the spiral groove, and are prevented from entering the mechanical seal device, so that the service life of the mechanical seal is prolonged; fig. 8 is a schematic diagram of the structure of the backflow hole of the pump, the backflow hole is located on the left below the pump body, liquid flows back to the impeller through the backflow hole to achieve the self-suction function, and meanwhile, through the cooperation of the blade on the impeller and the cutting grooves on the front sealing ring and the rear pump cover, the cutting and isolation of fiber impurities are achieved, and the backflow hole is effectively prevented from being blocked by fibers, impurities and the like, so that the self-suction function is damaged.

The embodiments described in this specification are merely illustrative of implementations of the inventive concepts, which are intended for purposes of illustration only. The scope of the present invention should not be construed as being limited to the particular forms set forth in the examples, but rather as being defined by the claims and the equivalents thereof which can occur to those skilled in the art upon consideration of the present inventive concept.