CN209818407U

CN209818407U - Pump mechanical seal flushing structure with built-in hydrocyclone separator

Info

Publication number: CN209818407U
Application number: CN201920741942.3U
Authority: CN
Inventors: 吕见江; 尹红庆; 何晓波; 赵兴英; 张永祥
Original assignee: Chongqing Pump Industry Co Ltd
Current assignee: Chongqing Pump Industry Co Ltd
Priority date: 2019-05-22
Filing date: 2019-05-22
Publication date: 2019-12-20
Anticipated expiration: 2029-05-22

Abstract

The utility model discloses a pump mechanical seal flushing structure with a built-in hydrocyclone, which comprises a pump and a hydrocyclone, wherein a high-pressure cavity and a low-pressure cavity are arranged in a pump shell; a liquid inlet is formed in the side face of the upper end of the hydrocyclone separator, a liquid outlet is formed in the top end of the hydrocyclone separator, and a backflow port is formed in the bottom end of the hydrocyclone separator; the liquid outlet of the hydrocyclone separator is communicated with the mechanical seal through a pipeline; the hydrocyclone separator is arranged in the pump shell; an overflow channel is arranged between the liquid inlet of the hydrocyclone and the high-pressure cavity and communicates the high-pressure cavity with the liquid inlet of the hydrocyclone; and a backflow hole is arranged between the reflux port of the hydrocyclone separator and the low pressure cavity, and communicates the reflux port of the hydrocyclone separator with the low pressure cavity. The structure effectively saves the installation space of the hydrocyclone separator, has high safety factor in the washing process, meets the requirement of earthquake resistance, and is convenient to disassemble and assemble.

Description

Pump mechanical seal flushing structure with built-in hydrocyclone separator

Technical Field

The utility model relates to a technical field of pump, concretely relates to built-in hydrocyclone's pump mechanical seal washing structure.

Background

The hydrocyclone separator is also called a hydrocyclone, and is a fluid device for separating solid particles in a liquid medium by utilizing the action of density difference and centrifugal force between the solid particles and the liquid medium, feed liquid enters from a cylindrical part of the hydrocyclone separator in a tangential direction and rotates to generate centrifugal force, the feed liquid is more violent when falling to a conical part, the solid particles or the liquid with higher density in the feed liquid are thrown to a wall of the hydrocyclone separator under the action of the centrifugal force and flow to an outlet along the wall of the hydrocyclone separator according to a spiral line, and the separation of a solid-phase mixture is effectively realized.

When utilizing the pump to carry the medium now, need continuously wash mechanical seal, that is because the pump is at the operation in-process, contains granule, impurity in the sealed chamber, must wash, otherwise can be because of the precipitation of crystallization, granule impurity, make mechanical seal move, quiet ring lose the floatability, the spring is malfunctioning. The method mainly adopted is as follows: the pump is internally provided with a high-pressure cavity and a low-pressure cavity, the high-pressure cavity stores a small amount of conveying medium pressurized by a pump impeller, a liquid inlet of the hydrocyclone separator is communicated with the high-pressure cavity in the pump through a pipeline, the pressurized conveying medium is separated in the hydrocyclone separator, the mechanical seal is washed by liquid which does not contain solid particles after the separation, and the solid particles separated by the hydrocyclone separator are communicated with the low-pressure cavity in the pump through a pipeline. However, the existing hydrocyclone is of an integral casting structure type, a liquid inlet pipeline and a backflow pipeline are required to be arranged outside the hydrocyclone and are respectively connected with a side water inlet and a bottom backflow port of the hydrocyclone, when the hydrocyclone is used in a special space limiting occasion, the use requirement is not met due to overlarge occupied area, meanwhile, the quantity and welding quantity of the connecting pipelines are increased by externally arranging the liquid inlet pipeline and the backflow pipeline, and when a medium in the nuclear power field is conveyed, strict requirements on shock resistance are met, when an earthquake or external impact occurs, the external connecting pipeline can shake accordingly, the safe operation of the device is affected, and the device breaks when serious, so that the medium leaks. In addition, when toxic and harmful conveying media are conveyed, the toxic and harmful media are easy to leak out due to the fault of the hydrocyclone separator.

Disclosure of Invention

The above-mentioned not enough to prior art exists, the utility model aims at providing a save installation space, factor of safety height, and easy dismounting's built-in hydrocyclone's pump mechanical seal washing structure just.

The technical scheme of the utility model is realized like this:

a pump mechanical seal flushing structure with a built-in hydrocyclone separator comprises a pump and the hydrocyclone separator, wherein a high-pressure cavity and a low-pressure cavity are arranged in a pump shell; a liquid inlet is formed in the side face of the upper end of the hydrocyclone separator, a liquid outlet is formed in the top end of the hydrocyclone separator, and a backflow port is formed in the bottom end of the hydrocyclone separator; the liquid outlet of the hydrocyclone separator is communicated with the mechanical seal through a pipeline; the hydrocyclone separator is arranged in the pump shell; an overflow channel is arranged between the liquid inlet of the hydrocyclone and the high-pressure cavity and communicates the high-pressure cavity with the liquid inlet of the hydrocyclone; and a backflow hole is arranged between the reflux port of the hydrocyclone separator and the low pressure cavity, and communicates the reflux port of the hydrocyclone separator with the low pressure cavity.

Furthermore, a mounting groove for mounting the hydrocyclone separator is arranged in the pump shell; the hydrocyclone separator consists of a gland and a shell, a liquid inlet and a liquid outlet are arranged on the gland, and a backflow port is arranged on the shell; the bottom end of the shell is fixed with the bottom end of the mounting groove; the top end of the shell and the bottom end of the gland are correspondingly clung and fixedly connected; the gland is fixedly installed at the top end of the installation groove through a plurality of threaded connecting pieces and seals the top end of the installation groove.

Furthermore, the mounting groove is composed of four cylindrical cavities which are arranged up and down and communicated with each other, and the four cylindrical cavities are a first cylindrical cavity, a second cylindrical cavity, a third cylindrical cavity and a fourth cylindrical cavity from top to bottom in sequence; the lower end of the gland passes through the first cylindrical cavity and the second cylindrical cavity and is fixedly connected with the top end of the shell in the third cylindrical cavity, and the outer surfaces of the first cylindrical cavity and the second cylindrical cavity, which correspond to the gland, are respectively clung to the cavity walls of the first cylindrical cavity and the second cylindrical cavity; the lower end of the shell is inserted into the fourth cylindrical cavity and is tightly attached to the wall and the bottom surface of the fourth cylindrical cavity.

Furthermore, the diameter of the third cylindrical cavity is larger than that of the corresponding shell, so that an annular cavity is formed on the outer surface of the third cylindrical cavity corresponding to the shell, the liquid inlet of the hydrocyclone is communicated with the annular cavity, and an overflowing hole is arranged between the annular cavity and the high-pressure cavity and used for communicating the high-pressure cavity with the annular cavity; meanwhile, a first rubber sealing ring is arranged on the outer surface of the gland corresponding to the first cylindrical cavity, and a second rubber sealing ring is arranged on the outer surface of the shell corresponding to the fourth cylindrical cavity.

Further, the outer surface of the top of the shell corresponding to the third cylindrical cavity is provided with threads.

Furthermore, the bottom end of the shell is fixed at the bottom end of the mounting groove through an anti-rotation pin.

Furthermore, a metal winding pad is arranged at the corresponding connection position of the top end of the gland and the top end of the shell.

Furthermore, the threaded connecting piece consists of a stud and a nut, a plurality of through holes are formed in the gland, a plurality of corresponding threaded holes are formed in the pump shell, the stud penetrates through the through holes in the gland and then is inserted into the corresponding threaded holes, and the nut is installed on the stud on the upper surface of the gland.

Compared with the prior art, the utility model discloses following beneficial effect has:

1. the utility model places the hydrocyclone inside the pump case without occupying the installation space, thereby saving the installation space, and simultaneously, the outside of the hydrocyclone is not required to be provided with the liquid inlet pipeline and the backflow pipeline, thereby reducing the quantity and the welding quantity of the connecting pipelines, and greatly reducing the installation difficulty and the construction cost; and if the toxic and harmful media are transported, the media can be effectively prevented from leaking when the hydrocyclone separator breaks down, so that the safety factor of the pump in the process of transporting the media is improved, and the environment is protected.

2. The utility model discloses need not set up feed liquor pipeline and backflow pipeline outside, can satisfy the nuclear power field and to shock-resistant requirement, can bear shock resistance and external shock etc. guaranteed the safe operation of device.

3. The cyclone separator of the utility model is divided into the gland and the shell, which facilitates the disassembly and assembly process; the circular cavity is not only beneficial to the disassembly and assembly of the hydrocyclone separator, but also beneficial to the convenient processing of the mounting groove; the outer surface of the top of the shell is provided with threads, and the shell can be quickly disassembled and assembled through a special tool, so that the harmful medium is prevented from directly injuring the body.

Drawings

Fig. 1-the structure of the present invention is schematically illustrated.

Wherein: 1-a pump casing; 2-pressing the cover; 3-a shell; 4-high pressure chamber; 5-a low pressure chamber; 6-liquid inlet; 7-a liquid outlet; 8-a reflux port; 9-an overflowing hole; 10-a reflow hole; 11-anti-rotation pins; 12-a second rubber sealing ring; 13-a stud; 14-a first rubber sealing ring; 15-liquid outlet pipeline; 16-screw thread; 17-metal wound mat.

Detailed Description

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

Referring to fig. 1, a pump mechanical seal flushing structure with a built-in hydrocyclone separator comprises a pump and a hydrocyclone separator, wherein a high-pressure cavity 4 and a low-pressure cavity 5 are arranged in a pump shell 1; a liquid inlet 6 is arranged on the side surface of the upper end of the hydrocyclone separator, a liquid outlet 7 is arranged at the top end of the hydrocyclone separator, and a backflow port 8 is arranged at the bottom end of the hydrocyclone separator; the liquid outlet 7 of the hydrocyclone separator is communicated with the mechanical seal through a liquid outlet pipeline 15; the hydrocyclone separator is arranged in the pump shell 1; an overflow channel is arranged between the liquid inlet 6 of the hydrocyclone and the high-pressure cavity 4 and communicates the high-pressure cavity 4 with the liquid inlet 6 of the hydrocyclone; be equipped with backward flow hole 10 between hydrocyclone separator return opening 8 and the low pressure chamber 5, backward flow hole 10 communicates hydrocyclone separator return opening 8 and low pressure chamber 5.

Therefore, a pressure difference is formed between the high-pressure cavity and the low-pressure cavity, when the pump conveys a medium, a small part of medium which is stored in the high-pressure cavity and is pressurized by the pump impeller can smoothly pass through the overflowing channel and then enter the hydrocyclone from the liquid inlet of the hydrocyclone to be separated, the separated liquid flows out of the liquid outlet and then washes the mechanical seal through the pipeline, and the liquid flows back to the pump inlet after washing and is conveyed by the pump again; and solid medium gets into the low pressure chamber through the backward flow hole after coming out from the backward flow mouth, and low pressure chamber and pump import intercommunication are then carried by the pump once more, so repetition above step, when guaranteeing effectively to carry the medium, also effectual realization has washed mechanical seal.

In addition, because of setting up hydrocyclone separator inside the pump case, can not occupy other spaces, make full use of the original effective space of pump install can, be very practical to the narrow and small condition in installation space very much. When toxic and harmful media are conveyed and the cyclone separator breaks down in time, the leaked media are still in the pump shell and cannot leak, and therefore the environment cannot be influenced and danger cannot be brought to operators.

The pump shell 1 is internally provided with an installation groove for installing the hydrocyclone separator; the hydrocyclone separator consists of a gland 2 and a shell 3, a liquid inlet 6 and a liquid outlet 7 are arranged on the gland 2, and a return port 8 is arranged on the shell 3; the bottom end of the shell 3 is fixed with the bottom end of the mounting groove; the top end of the shell 3 and the bottom end of the gland 2 are correspondingly clung and fixedly connected; the gland 2 is fixedly installed at the top end of the installation groove through a plurality of threaded connecting pieces and seals the top end of the installation groove.

Therefore, the hydrocyclone separator is divided into the gland and the shell, so that the gland and the shell of the hydrocyclone separator can be conveniently and respectively mounted and dismounted, and the dismounting process is simplified. When the shell is fixed on the mounting groove, the gland is fixed on the pump shell through the bolt, downward acting force is applied to the gland, and reverse acting force is applied to the shell at the bottom of the mounting groove, so that the gland of the hydrocyclone separator is fixedly connected with the shell.

The mounting groove is composed of four cylindrical cavities which are arranged up and down and are communicated with each other, and the four cylindrical cavities are a first cylindrical cavity, a second cylindrical cavity, a third cylindrical cavity and a fourth cylindrical cavity from top to bottom in sequence; the lower end of the gland 2 passes through the first cylindrical cavity and the second cylindrical cavity and is fixedly connected with the top end of the shell 3 in the third cylindrical cavity, and the outer surfaces of the first cylindrical cavity and the second cylindrical cavity, which correspond to the gland 2, are respectively clung to the cavity walls of the first cylindrical cavity and the second cylindrical cavity; the lower end of the shell 3 is inserted into the fourth cylindrical cavity and is tightly attached to the wall and the bottom of the fourth cylindrical cavity.

The four cylindrical cavities are arranged, the outer surfaces of the first cylindrical cavity and the second cylindrical cavity, which correspond to the gland, are respectively clung to the cavity walls of the first cylindrical cavity and the second cylindrical cavity, so that the interior of the pump including the hydrocyclone is in a sealed state to a certain extent, and the gland is effectively limited; the lower end of the shell is inserted into the fourth cylindrical cavity and is tightly attached to the wall and the bottom of the fourth cylindrical cavity, so that the shell can be effectively limited. Meanwhile, the second cylindrical cavity needs to be matched and connected with the lower end of the gland to form a better sealing state, the machining precision is high, the fourth cylindrical cavity needs to be matched with the lower end of the shell to form better sealing and limiting, and the machining precision is also high.

The diameter of the third cylindrical cavity is larger than that of the corresponding shell 3, so that an annular cavity is formed on the outer surface of the third cylindrical cavity corresponding to the shell, the liquid inlet 6 of the hydrocyclone is communicated with the annular cavity, an overflowing hole 9 is arranged between the annular cavity and the high-pressure cavity 4, and the overflowing hole 9 is used for communicating the high-pressure cavity 4 with the annular cavity; meanwhile, a first rubber sealing ring 14 is arranged on the outer surface of the gland corresponding to the first cylindrical cavity, and a second rubber sealing ring 12 is arranged on the outer surface of the shell corresponding to the fourth cylindrical cavity.

Here, the third cylinder chamber widens the back and sets up ring shape cavity, not only is favorable to hydrocyclone's dismouting, does not need moreover to cooperate with other parts, and the machining precision is not high to it is convenient still to be favorable to mounting groove processing. The first rubber sealing ring is used for further sealing the inside of the pump, so that the pressurized medium in the annular cavity is effectively prevented from leaking out, and the second rubber sealing ring can effectively prevent the pressurized medium in the annular cavity from directly entering the low-pressure cavity without passing through the hydrocyclone. And the overflowing channel formed in such a way is a channel formed by the overflowing hole and the annular cavity.

The outer surface of the top of the shell 3 corresponding to the third cylindrical cavity is provided with threads 16. Thus, the quick assembly and disassembly of the special tool are facilitated, and the direct damage of harmful media to the body is avoided.

The bottom end of the shell is fixed at the bottom end of the mounting groove through an anti-rotation pin 11. Further fixing the housing to prevent rotation of the housing. The liquid of hydrocyclone separator leans on the hydrocyclone separator inner wall to get into to separation is realized in the hydrocyclone separator internal rotation, after setting up the rotation prevention round pin, can effectively prevent hydrocyclone separator's casing self from rotating, and then causes the influence to sealed. The housing can also be fixed by providing only one anti-rotation pin.

And a metal winding pad 17 is arranged at the corresponding joint of the top end of the shell and the top end of the gland. The metal winding pad is a semi-metal flat gasket formed by spirally and compositely winding a metal belt and a non-metal belt, the outer ring of the metal winding pad adopted in the embodiment is made of metal, and the inner ring of the metal winding pad is made of graphite.

The threaded connecting piece is composed of a stud 13 and a nut, a plurality of through holes are formed in the gland, a plurality of corresponding threaded holes are formed in the pump shell, the stud penetrates through the through hole in the gland and then is inserted into the corresponding threaded hole, and the nut is installed on the stud on the upper surface of the gland.

Finally, it should be noted that the above-mentioned embodiments of the present invention are only examples for illustrating the present invention, and are not limitations to the embodiments of the present invention. Variations and modifications in other variations will occur to those skilled in the art upon reading the foregoing description. Not all embodiments are exhaustive. All obvious changes or variations which are introduced by the technical solution of the present invention are still within the scope of the present invention.

Claims

1. A pump mechanical seal flushing structure with a built-in hydrocyclone separator comprises a pump and the hydrocyclone separator, wherein a high-pressure cavity and a low-pressure cavity are arranged in a pump shell; a liquid inlet is formed in the side face of the upper end of the hydrocyclone separator, a liquid outlet is formed in the top end of the hydrocyclone separator, and a backflow port is formed in the bottom end of the hydrocyclone separator; the liquid outlet of the hydrocyclone separator is communicated with the mechanical seal through a pipeline; the device is characterized in that the hydrocyclone separator is arranged in the pump shell; an overflow channel is arranged between the liquid inlet of the hydrocyclone and the high-pressure cavity and communicates the high-pressure cavity with the liquid inlet of the hydrocyclone; and a backflow hole is arranged between the reflux port of the hydrocyclone separator and the low pressure cavity, and communicates the reflux port of the hydrocyclone separator with the low pressure cavity.

2. The mechanical pump seal flushing structure with the built-in hydrocyclone according to claim 1, characterized in that a mounting groove for mounting the hydrocyclone is arranged in the pump shell; the hydrocyclone separator consists of a gland and a shell, a liquid inlet and a liquid outlet are arranged on the gland, and a backflow port is arranged on the shell; the bottom end of the shell is fixed with the bottom end of the mounting groove; the top end of the shell and the bottom end of the gland are correspondingly clung and fixedly connected; the gland is fixedly installed at the top end of the installation groove through a plurality of threaded connecting pieces and seals the top end of the installation groove.

3. The pump mechanical seal flushing structure with the built-in hydrocyclone, as recited in claim 2, is characterized in that the mounting groove is formed by four cylindrical cavities which are arranged up and down and are communicated with each other, and the four cylindrical cavities are a first cylindrical cavity, a second cylindrical cavity, a third cylindrical cavity and a fourth cylindrical cavity from top to bottom; the lower end of the gland passes through the first cylindrical cavity and the second cylindrical cavity and is fixedly connected with the top end of the shell in the third cylindrical cavity, and the outer surfaces of the first cylindrical cavity and the second cylindrical cavity, which correspond to the gland, are respectively clung to the cavity walls of the first cylindrical cavity and the second cylindrical cavity; the lower end of the shell is inserted into the fourth cylindrical cavity and is tightly attached to the wall and the bottom surface of the fourth cylindrical cavity.

4. The structure of claim 3, wherein the diameter of the third cylindrical cavity is larger than the diameter of the corresponding shell, so that an annular cavity is formed on the outer surface of the corresponding shell of the third cylindrical cavity, the liquid inlet of the hydrocyclone is communicated with the annular cavity, and an overflowing hole is arranged between the annular cavity and the high-pressure cavity and communicates the high-pressure cavity with the annular cavity; meanwhile, a first rubber sealing ring is arranged on the outer surface of the gland corresponding to the first cylindrical cavity, and a second rubber sealing ring is arranged on the outer surface of the shell corresponding to the fourth cylindrical cavity.

5. The mechanical pump seal flushing structure with the built-in hydrocyclone according to claim 4, characterized in that the outer surface of the top of the shell corresponding to the third cylindrical cavity is provided with screw threads.

6. The mechanical pump seal flushing structure with the built-in hydrocyclone, as claimed in claim 2, wherein the bottom end of the housing is fixed at the bottom end of the mounting groove by an anti-rotation pin.

7. The mechanical pump seal flushing structure with built-in hydrocyclone according to claim 2, characterized in that the corresponding joint of the top end of the gland and the top end of the shell is provided with a metal winding pad.

8. The mechanical pump seal flushing structure with the built-in hydrocyclone, as claimed in claim 2, wherein the threaded connection member is composed of a stud and a nut, the gland is provided with a plurality of through holes, the pump casing is provided with a plurality of corresponding threaded holes, the stud is inserted into the corresponding threaded hole after passing through the through hole on the gland, and the nut is mounted on the stud on the upper surface of the gland.