CN211648475U

CN211648475U - Middle open type multi-stage pump with improved structure

Info

Publication number: CN211648475U
Application number: CN202020020142.5U
Authority: CN
Inventors: 王立; 潘世群
Original assignee: Changsha Zhonglian Pump Co ltd
Current assignee: Changsha Zhonglian Pump Co ltd
Priority date: 2020-01-06
Filing date: 2020-01-06
Publication date: 2020-10-09
Anticipated expiration: 2030-01-06

Abstract

The utility model discloses an improve open multistage pump in structure, including pump cover, the pump body, the sealed pad of dysmorphism, middle bearing body, middle bearing housing and decompression pipe, pump body top is arranged in to the pump cover, forms the casing of pump behind the two composition face combinations, and the casing has a continuous space runner. The pump cover and the pump body are respectively provided with a special-shaped convex spigot and a special-shaped concave spigot, and the special-shaped sealing gasket is arranged in a special-shaped concave spigot groove of the pump body. The intermediate bearing body is embedded in an annular groove in the middle of the shell, and the pressure reducing pipe connects the suction cavity on the left side of the pump cover with the sealing cavity on the right side of the pump cover, so that the pressure of the sealing cavity is approximately equal to the low pressure of the suction cavity. The integral rigidity of the pump is good, and the positioning precision is high; the hidden danger of leakage is less, and the sealing is reliable; adopt high accuracy numerical control equipment processing, the precision is high, simple to operate has guaranteed very high installation accuracy and operation precision, the utility model discloses more be suitable for high temperature high pressure and do not have the leakage occasion.

Description

Middle open type multi-stage pump with improved structure

Technical Field

The utility model relates to a water pump field especially relates to an improve open multistage pump in structure.

Background

The middle-open type multi-stage pump is a common multi-stage pump and is widely applied to the fields of electric power, metallurgy, mines, municipal administration, ships, petroleum, chemical industry and the like.

The split multi-stage pump in the prior art has many defects, the joint surface of the pump body and the pump cover is a complete plane, the pump body and the pump cover cannot be positioned, the pump body and the pump cover are positioned by two positioning pins arranged diagonally, and the positioning pins are low in rigidity and not suitable for occasions with high pressure and large transverse load. In addition, the static seal of the middle-opening multi-stage pump in the prior art is a sealing gasket clamped between the joint surfaces of the pump body and the pump cover, the two joint surfaces are separated and do not contact with each other, the gap between the two joint surfaces is determined by the tensile force of bolts on the joint surfaces, the larger the tensile force is, the larger the compression amount of the sealing gasket is, the smaller the gap between the two joint surfaces is, the gaps at each position are not uniform when the tensile force of the bolts is unequal, leakage is easy to generate, and the sealing is difficult to obtain. Meanwhile, since the gap between the joint surfaces of the two joint surfaces is not fixed, the shape accuracy of the roundness of the inner hole of the pump casing is reduced, and thus the pump may have unexpected failures. Finally, with the increase of pump technology, the rotor is longer, the rigidity is reduced, the vibration is increased, and in severe cases, the rotor is in contact with and rubs against the shell, so that the pump is overloaded or the rotor is locked.

Therefore, the prior art mid-open multistage pump is not suitable for high pressure and many stages.

Disclosure of Invention

In order to solve the problem, the utility model provides an improve open multistage pump in structure, rigidity is good, and positioning accuracy is high, and is sealed reliable, is suitable for the high-pressure high-lift occasion.

The utility model adopts the technical proposal that:

a middle-open type multistage pump with an improved structure comprises a pump cover, a pump body, a special-shaped sealing gasket, an intermediate bearing body, an intermediate bearing sleeve and a pressure reducing pipe, wherein the pump cover is arranged above the pump body, the joint surface of the pump cover and the pump body is combined to form a pump shell, and the pump shell is provided with a continuous space flow channel; the special-shaped sealing gasket is arranged in a special-shaped concave spigot groove of the pump body; the middle bearing body is embedded in an annular groove in the middle of the shell; the pressure reducing pipe connects the suction cavity on the left side of the pump cover with the sealing cavity on the right side of the pump cover, so that the pressure of the sealing cavity is approximately equal to the low pressure of the suction cavity; the middle bearing body and the middle bearing sleeve form a sliding bearing together to play a role of auxiliary supporting for a pump rotor, the middle bearing sleeve is sleeved in the middle of the pump shaft, and the middle bearing body is sleeved outside the middle bearing sleeve; the impeller is sleeved on the pump shaft and symmetrically arranged on two sides of the middle bearing sleeve.

As a further improvement, the composition surface of pump cover is equipped with the protruding tang of dysmorphism, the composition surface of the pump body is equipped with the concave tang of dysmorphism, the protruding tang of dysmorphism inserts in the concave tang of dysmorphism, and the two outside surface mutual contact and mutually support, play the effect of the pump body of location and pump cover.

As a further improvement, the shape of the special-shaped sealing gasket with the shape of the special-shaped male spigot end face unanimous, the special-shaped male spigot end face compresses tightly the special-shaped sealing gasket in the special-shaped female spigot groove, the special-shaped sealing gasket is right the composition surface of the pump body and pump cover seals, this moment the length of the special-shaped male spigot adds the groove depth that the thickness of the special-shaped sealing gasket after compressing tightly equals the special-shaped female spigot.

As a further improvement of the utility model, the top of the suction cavity at the left side of the pump cover and the top of the sealing cavity at the right side are respectively provided with a pipe orifice, the pipe orifice at the left side is connected with the left end of the pressure reducing pipe, and the pipe orifice at the right side is connected with the right end of the pressure reducing pipe; an annular groove is formed in the middle of the pump cover, and a small hole is formed in the upper portion of the annular groove and leads to the top channel.

As a further improvement of the utility model, the left side of the pump body is provided with a horizontal inlet and an inlet flange, the middle part of the pump body is provided with a horizontal outlet and an outlet flange, and the horizontal outlet is connected with the final-stage runner; an annular groove is formed in the middle of the pump body.

As a further improvement of the utility model, the left and right ends of the shell after the pump body and the pump cover are combined are both provided with a sealing cavity, a mechanical seal is arranged in the sealing cavity, an end cover sealing gasket is arranged between the end surface of the mechanical sealing end cover and the sealing cavity, and the end cover sealing gasket and the special-shaped sealing gasket form the static seal of the pump shell; the dynamic seal of the middle-open type multistage pump with the improved structure is a mechanical seal, and the mechanical seal is a large spring balance type and is suitable for high-pressure working conditions.

The utility model also provides a manufacturing approach of open multistage pump in well of improvement structure, including following step: the joint surface of the pump body, the special-shaped concave spigot, the joint surface of the pump cover and the special-shaped convex spigot are machined in one step by means of a numerical control milling cutter by means of modern advanced numerical control machining technology; combining the pump body with the pump cover, matching and positioning the special-shaped male spigot and the special-shaped female spigot, clamping the pump body with a joint surface flange of the pump cover by using a clamp for fixing, drilling a joint surface flange bolt hole, then penetrating a bolt for fixing, and finally processing all inner holes (including rolling bearing holes at two ends, inner holes of a sealing cavity and an annular groove in the middle of a shell) and all end surfaces vertical to the axis at one time on a boring machine; after parts such as an impeller, a shaft sleeve, a mechanical seal, a middle bearing body, a middle bearing sleeve, a pump shaft, a mechanical seal end cover, an end cover sealing gasket and the like are processed, a pump rotor (comprising a non-rotating mechanical seal end cover, a mechanical seal static ring, an end cover sealing gasket, a middle bearing body and a rolling bearing) is assembled; the assembly process comprises the following steps: the pump rotor is put in a proper position above the pump body, the rolling bearing, the middle bearing body, the mechanical seal end cover, the mechanical seal static ring, the end face sealing gasket and the like are put in place on the pump body, the special-shaped sealing gasket is put in the special-shaped concave spigot, the pump cover is closed, the flange bolt of the joint face is tightened, and other assembling is completed.

Compared with the prior art, the utility model relates to an improve open multistage pump in middle of structure and manufacturing method thereof, following beneficial effect has:

1. the overall rigidity of the pump is good, and the positioning accuracy is high: the pump cover is provided with the special-shaped male spigot and the pump body special-shaped female spigot which are matched with each other and positioned, and a large spigot positioning surface has high precision and rigidity through the processing of a high-precision numerical control boring and milling center, so that the pump cannot generate large deformation in the high-pressure and high-temperature operation process, and the dislocation of the pump cover and the pump body caused by insufficient rigidity of a positioning pin in the prior art is avoided. Meanwhile, because the joint surface of the pump body and the pump cover is in close contact with each other in the high-pressure and high-temperature operation process, the roundness of each inner hole on the shell cannot be reduced, and the operation precision of the pump rotor is ensured.

2. The hidden danger of leakage is less, and the sealing is reliable: the joint surface of the pump body and the pump cover is tightly combined under the action of high pressure and high temperature, the special-shaped sealing gasket is uniformly compressed, and the sealing is reliable. On the other hand, the roundness of each inner hole on the shell cannot be reduced, the reliability of dynamic seal (mechanical seal) is high, and the static seal of the mechanical seal cover is also very reliable because the pump cover and the pump body are not staggered (the service of the mechanical seal end face is staggered).

3. And high-precision numerical control equipment is adopted, so that the machining precision is high, the installation is convenient, and the very high installation precision and operation precision are ensured.

To sum up, the improved structure of the middle-open type multistage pump and the manufacturing method thereof have the advantages of high positioning precision, good rigidity and reliable sealing. Therefore, the utility model discloses more be suitable for high temperature high pressure and do not have the leakage occasion.

Drawings

The present invention will be further described with reference to the accompanying drawings and embodiments.

Fig. 1 is a schematic view of the overall structure of the present invention.

Fig. 2 is a left side view of the present invention.

Fig. 3 is a plan view of the present invention.

Fig. 4 is the structure view of the pump cover of the present invention.

Fig. 5 is a structure view of the pump body of the present invention.

In the figure: 1. end cover sealing gasket, 2, pressure reducing pipe, 3, impeller, 4, middle bearing body, 5, middle bearing sleeve, 6, pump cover, 7, pump body, 8, mechanical seal, 9, pump shaft, 10, special-shaped sealing gasket, 11, machine cover end, 61, special-shaped male spigot, 62, annular groove, 63, small hole, 71, special-shaped female spigot, 72, inlet flange, 73 and outlet flange

Detailed Description

It should be noted that, in the present invention, the embodiments and features of the embodiments may be combined with each other without conflict. The present invention will be described in detail below with reference to the accompanying drawings in conjunction with embodiments.

As shown in fig. 1 to 5, the split multi-stage pump with an improved structure comprises a pump cover 6, a pump body 7, a special-shaped sealing gasket 10, an intermediate bearing body 4, an intermediate bearing sleeve 5 and a pressure reducing pipe 2, wherein the pump cover 6 is arranged above the pump body 7, the joint surface of the pump body 7 and the intermediate bearing sleeve is combined to form a pump casing, and the casing is provided with a continuous spatial flow channel. One half of the space flow channel is positioned on the pump cover 6, the other half is positioned on the pump body 7, and the joint surface is in smooth transition and butt joint. The space flow channel is provided with a plurality of volute chambers, and the impeller 3 is arranged in the volute chambers. The liquid is pressurized by the impeller, flows into the volute cavity and then enters the suction inlet of the next-stage impeller 3 through the space flow channel; the special-shaped sealing gasket 10 is arranged in the groove of the special-shaped concave spigot 71 of the pump body 7 and is uniformly compressed by the end surface of the special-shaped convex spigot 61; the intermediate bearing body 4 is embedded in an annular groove 62 in the middle of the shell and is positioned by the annular groove 62, and a radial small hole of the intermediate bearing body 4 is in opposite communication with a small hole 63 in the upper part of the annular groove 62; the pressure reducing pipe 2 connects the suction cavity on the left side of the pump cover 6 with the sealing cavity on the right side of the pump cover, so that the pressure of the sealing cavity is approximately equal to the low pressure of the suction cavity, the sealing cavities at the two ends are in a low-pressure state, the working environment of mechanical sealing is improved, and the service life of the mechanical sealing is prolonged; the intermediate bearing body 4 and the intermediate bearing sleeve 5 form a sliding bearing together, which plays a role of auxiliary support for the pump rotor and increases the rigidity of the rotor. The middle bearing sleeve 5 is sleeved in the middle of the pump shaft 9, and the middle bearing body 4 is sleeved outside the middle bearing sleeve; the impeller 3 is sleeved on the pump shaft 9 and symmetrically arranged on two sides of the middle bearing sleeve 5.

The joint surface of the pump cover 6 is provided with a special-shaped male spigot 61, the joint surface of the pump body 7 is provided with a special-shaped female spigot 71, the special-shaped male spigot 61 is inserted into the special-shaped female spigot 71, and the outer side surfaces of the two are mutually contacted and matched, so that the pump body 7 and the pump cover 6 are positioned. The special-shaped concave spigot 71, the special-shaped convex spigot 61 and the joint surface of the pump cover 6 and the pump body 7 are processed by a precision numerical control milling machine, so that the positioning precision and rigidity are high, and spigot positioning replaces conical pin positioning in the prior art, so that the defect of insufficient conical pin positioning rigidity is avoided.

The shape of the special-shaped sealing gasket 10 is consistent with that of the end face of the special-shaped male spigot 61, the special-shaped sealing gasket 10 is pressed in the groove of the special-shaped female spigot 71 by the end face of the special-shaped male spigot 61, the special-shaped sealing gasket 10 seals the joint face of the pump body 7 and the pump cover 6, and at the moment, the length of the special-shaped male spigot 61 and the thickness of the pressed special-shaped sealing gasket 10 are equal to the groove depth of the special-shaped female spigot 71. The shape is sealed 10 and is compressed evenly, and the deflection can not change along with the change of load during the pump use, and this sealed drawback that arouses the leakage because the deflection is inhomogeneous that has just thoroughly eliminated traditional technique sealed, has also avoided traditional technique sealed the dislocation phenomenon in the hole on the casing that need fix a position the pump body and pump cover and cause simultaneously, consequently the utility model discloses compare in traditional technique and more be suitable for the high pressure occasion.

The top of the suction cavity on the left side of the pump cover 6 and the top of the sealing cavity on the right side are respectively provided with a pipe orifice, the pipe orifice on the left side is connected with the left end of the pressure reducing pipe 2, and the pipe orifice on the right side is connected with the right end of the pressure reducing pipe 2; the pump cover 6 has an annular groove 62 in the middle, and a small hole 63 in the upper part of the annular groove 62 leads to the top channel. The high-pressure liquid in the top channel flows into the inner wall of the intermediate bearing body 4 from the small hole 63 through the radial small hole of the intermediate bearing body 4, and the sliding bearing is lubricated, cooled and washed between the inner wall of the intermediate bearing body 4 and the excircle of the intermediate bearing sleeve 5.

A horizontal inlet and inlet flange 72 is arranged on the left side of the pump body 7, a horizontal outlet and outlet flange 73 is arranged in the middle of the pump body 7, and the horizontal outlet is connected with the final-stage flow channel; the central portion of the pump body 7 is provided with an annular groove 62.

The left end and the right end of the shell after the pump body 7 and the pump cover 6 are combined are provided with sealing cavities, mechanical seals 8 are arranged in the sealing cavities, an end cover gasket seal 1 is arranged between a mechanical end cover 11 and the end surface of the sealing cavity, and the end cover gasket seal 1 and the special-shaped gasket seal 10 form static seals of the pump shell; the dynamic seal of the middle-open type multistage pump with the improved structure is a mechanical seal 8, and the mechanical seal 8 is a large spring balance type and is suitable for high-pressure working conditions.

The manufacturing process of the middle open type multistage pump with the improved structure comprises the following steps: the joint surface of the pump body, the special-shaped concave spigot, the joint surface of the pump cover and the special-shaped convex spigot are machined in one step by a numerical control milling cutter in one step by means of modern advanced numerical control machining technology; combining the pump body with the pump cover, matching and positioning the special-shaped male spigot and the special-shaped female spigot, clamping the pump body with a joint surface flange of the pump cover by using a clamp for fixing, drilling a joint surface flange bolt hole, then penetrating a bolt for fixing, and finally processing all inner holes (including rolling bearing holes at two ends, inner holes of a sealing cavity and an annular groove in the middle of a shell) and all end surfaces vertical to the axis at one time on a boring machine; after parts such as an impeller, a shaft sleeve, a mechanical seal, a middle bearing body, a middle bearing sleeve, a pump shaft, a mechanical seal end cover, an end cover sealing gasket and the like are processed, a pump rotor (comprising a non-rotating mechanical seal end cover, a mechanical seal static ring, an end cover sealing gasket, a middle bearing body and a rolling bearing) is assembled; the assembly process comprises the following steps: the pump rotor is put in a proper position above the pump body, the rolling bearing, the middle bearing body, the mechanical seal end cover, the mechanical seal static ring, the end cover sealing gasket and the like are put in place on the pump body, the special-shaped sealing gasket is put in the special-shaped concave spigot, the pump cover is closed, the flange bolt of the joint surface is tightened, and other assembling is completed.

Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; although the present invention has been described in detail with reference to the foregoing embodiments, it should be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; such modifications and substitutions do not depart from the spirit and scope of the present invention.

Claims

1. The utility model provides an improve open multistage pump in structure which characterized in that: the pump cover is arranged above the pump body, the two are combined to form a pump shell, and the shell is provided with a continuous space flow channel; the special-shaped sealing gasket is arranged in a special-shaped concave spigot groove of the pump body; the middle bearing body is embedded in an annular groove in the middle of the shell; the pressure reducing pipe connects the suction cavity on the left side of the pump cover with the sealing cavity on the right side of the pump cover, so that the pressure of the sealing cavity is approximately equal to the low pressure of the suction cavity; the middle bearing body and the middle bearing sleeve form a sliding bearing together to play a role of auxiliary supporting for a pump rotor, the middle bearing sleeve is sleeved in the middle of the pump shaft, and the middle bearing body is sleeved outside the middle bearing sleeve; the pump shaft is sleeved with impellers, and the impellers are symmetrically arranged on two sides of the middle bearing sleeve.

2. The improved structure of the mid-open type multistage pump according to claim 1, wherein: the pump cover joint surface is equipped with special-shaped male spigot, the joint surface of the pump body is equipped with special-shaped female spigot, special-shaped male spigot inserts in special-shaped female spigot, and the two outside surface mutual contact and mutually support, play the effect of location pump body and pump cover.

3. The improved structure of the mid-open type multistage pump according to claim 2, wherein: the shape of the special-shaped sealing gasket is consistent with that of the special-shaped convex spigot end face, the special-shaped sealing gasket is compressed in the special-shaped concave spigot groove by the special-shaped convex spigot end face, the special-shaped sealing gasket seals the joint surface of the pump body and the pump cover, and at the moment, the length of the special-shaped convex spigot and the thickness of the compressed special-shaped sealing gasket are equal to the groove depth of the special-shaped concave spigot.

4. The improved structure of the mid-open type multistage pump according to claim 1, wherein: the top of the suction cavity on the left side of the pump cover and the top of the sealing cavity on the right side of the pump cover are respectively provided with a pipe orifice, the pipe orifice on the left side is connected with the left end of the pressure reducing pipe, and the pipe orifice on the right side is connected with the right end of the pressure reducing pipe; an annular groove is formed in the middle of the pump cover, and a small hole is formed in the upper portion of the annular groove and leads to the top channel.

5. The improved structure of the mid-open type multistage pump according to claim 1, wherein: the left side of the pump body is provided with a horizontal inlet and an inlet flange, the middle part of the pump body is provided with a horizontal outlet and an outlet flange, and the horizontal outlet is connected with a final-stage runner; an annular groove is formed in the middle of the pump body.

6. The improved structure of the mid-open type multistage pump according to claim 1, wherein: the left end and the right end of the shell after the pump body and the pump cover are combined are respectively provided with a sealing cavity, mechanical seals are arranged in the sealing cavities, a mechanical seal end cover is connected outside the sealing cavities, an end cover sealing gasket is arranged between the mechanical seal end cover and the end surface of the sealing cavity, and the end cover sealing gasket and the special-shaped sealing gasket form static seals of the pump shell; the dynamic seal of the middle-open type multistage pump with the improved structure is a mechanical seal, and the mechanical seal is a large spring balance type and is suitable for high-pressure working conditions.