CN216199204U - Shaft seal device of improved single-unit centrifugal pump - Google Patents

Abstract

The utility model discloses an improved shaft seal device of a single-machine centrifugal pump, which comprises a shaft sleeve, wherein a filler and a sealing mechanism are arranged on the outer side of the shaft sleeve, a cooling water interface is arranged on the outer side of the sealing mechanism, a fixed shaft ring is arranged on one side of the sealing mechanism, a throttling orifice plate is also arranged on the inner side of a port of the cooling water interface, and the sealing mechanism comprises a sealing cavity shell and a positioning outer ring; this practicality can provide dual bearing structure through the fixed axle ring that sets up, strengthens the resistance to pressure at the axle sleeve port, avoids pressure too big to lead to the structure to appear damaging, in addition through the orifice plate that sets up, can reduce the temperature that gets into mechanical seal cooling water, can avoid the rivers of cooling water rushing into too big moreover, lead to the higher problem of internal pressure, possess more outstanding usage structure.

Description

Shaft seal device of improved single-unit centrifugal pump

Technical Field

The utility model relates to the field of centrifugal pump shaft seal devices, in particular to an improved shaft seal device of a single centrifugal pump.

Background

A pump shaft of the water pump penetrates through a pump body, one end of the pump shaft is connected with a driving device (a motor), the other end of the pump shaft is used for mounting components such as an impeller, the pump shaft drives the impeller to rotate at a high speed when the water pump normally operates, the pump body keeps static, a certain gap is formed between the pump shaft and the pump body in order to prevent collision between moving and static states, the gap needs a shaft sealing device to seal, the shaft sealing device has the function of preventing high-pressure water in the pump body from flowing out in a large quantity through the gap between the pump shaft and the pump body and air from entering the pump from the gap, waste of working media and cavitation of the impeller are avoided, and the normal operation of the water pump is ensured; the most common shaft sealing devices used at present are packing seals and mechanical seals.

For the existing mechanical sealing structure, the pressure of a packing cavity is easy to be overlarge during use, and the acting force of the liquid pressure of the packing cavity on a mechanical seal cannot be resisted by a fixed shaft screw of a mechanical seal fixed shaft ring due to the overlarge pressure of the packing cavity, so that the displacement of a mechanical seal movable ring and a mechanical seal fixed ring is caused; meanwhile, the inflow of washing water is too large, and a cooler cannot play a cooling effect, so that the mechanical seal runs in a high-pressure and high-temperature state, and the failure and the damage are caused.

Disclosure of Invention

The utility model aims to provide an improved shaft seal device of a single-unit centrifugal pump, which aims to solve the problem that the shaft seal structure is easily damaged due to overlarge internal pressure of a packing cavity of the existing structure.

In order to achieve the purpose, the utility model provides the following technical scheme: the shaft seal device of the improved single-machine centrifugal pump comprises a shaft sleeve, wherein a filler and a sealing mechanism are arranged on the outer side of the shaft sleeve, a cooling water interface is arranged on the outer side of the sealing mechanism, a fixed shaft ring is arranged on one side of the sealing mechanism, a throttling orifice plate is further arranged on the inner side of a port of the cooling water interface, and the sealing mechanism comprises a sealing cavity shell and a positioning outer ring.

Preferably, the outer side of the sealing cavity shell is provided with a first embedded groove, and the inner side of the first embedded groove is provided with a first sealing ring and a second sealing ring.

Preferably, a notch is formed in the inner side of the joint between the first sealing ring and the second sealing ring, and a support ring is arranged inside the notch.

Preferably, the outer surface of the second sealing ring is provided with a second embedded groove, and the inner side of the positioning outer ring is provided with a protrusion matched with the second embedded groove.

Preferably, a sealing ring is arranged between the positioning outer ring and the second sealing ring.

Preferably, the port of the sealed cavity shell is further provided with an annular notch, and a sealing ring is arranged inside the notch.

Preferably, a sealing ring is arranged between the sealing cavity shell and the first sealing ring.

Preferably, the number of the fixed shaft rings is two, a limit ring is further arranged between the fixed shaft rings on the inner side and the sealing mechanism, and a fixed shaft screw is arranged on the inner side of the fixed shaft rings on the inner side.

Preferably, a packing cavity is formed in the inner side of the packing, and the sealing mechanism is clamped in the packing cavity.

Preferably, a notch is formed in the joint of the port on one side of the filler and the shaft sleeve, and the thickness of the notch is 0.15-0.25 mm.

Compared with the prior art, the utility model has the beneficial effects that:

through the collar of deciding that sets up, can provide dual bearing structure, strengthen the resistance to pressure at the axle sleeve port, avoid pressure too big to lead to the structure to appear damaging, in addition through the orifice plate that sets up, can reduce the temperature that gets into mechanical seal cooling water, and can avoid the rivers that cooling water rushed into too big, lead to the higher problem of internal pressure, possess more outstanding service structure, and the structure adopts three-layer seal's mechanical seal structure, sealed effect compares current mechanical seal structure, sealed effect is better.

Drawings

FIG. 1 is a cross-sectional view of the present invention;

fig. 2 is an enlarged schematic view of the structure at a in fig. 1 according to the present invention.

In the figure: 10. a shaft sleeve; 11. a filler; 111. a filler cavity groove; 112. a packing cavity; 12. a sealing mechanism; 13. positioning the outer ring; 131. a cooling water interface; 132. a restriction orifice plate; 14. a sealed chamber housing; 141. a first embedded groove; 142. a first seal ring; 143. a second seal ring; 144. a support ring; 145. a second embedded groove; 146. a seal ring; 15. a stationary collar; 16. a dead axle screw; 17. a limit ring.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

Referring to fig. 1-2, an improved shaft seal device of a single-machine centrifugal pump includes a shaft sleeve 10, a packing 11 and a sealing mechanism 12 are disposed outside the shaft sleeve 10, and a cooling water interface 131 is disposed outside the sealing mechanism 12.

Wherein, sealing mechanism 12 one side is provided with decides axle ring 15 the quantity of axle ring 15 is two, still is provided with spacing ring 17 between inboard axle ring 15 and the sealing mechanism 12, and inboard axle ring 15's inboard is provided with dead axle screw 16, and double-deck axle ring 15 decides is decided, sets up dead axle screw 16 in the inlayer, and the skin provides extra spacing protection, avoids the too big structure damage that leads to of pressure.

Wherein, the port inboard of cooling water interface 131 still is provided with orifice plate 132, and sealing mechanism 12 reduces the speed that the water source rushed into through orifice plate 132 including sealed chamber shell 14 and location outer loop 13, avoids too big water impact, leads to the unable cooling effect that provides of cooler connected, and the cooling water after the reduction of speed can provide mild cooling effect, guarantees the stable operation of the centrifugal pump body.

Wherein, first embedded groove 141 has been seted up in the outside of sealed chamber shell 14, the inboard of first embedded groove 141 is provided with first sealing ring 142 and second sealing ring 143, the junction inboard between first sealing ring 142 and the second sealing ring 143 is provided with the notch, be provided with support ring 144 on the inside of notch, second embedded groove 145 has been seted up to the surface of second sealing ring 143, the inboard of location outer loop 13 is seted up with second embedded groove 145 assorted arch, set up the support casing that sealed chamber shell 14 provided the mechanical seal structure in the outside, set up second embedded groove 145 in its outside and carry out the connection of sealing ring, install first sealing ring 142 and second sealing ring 143 two sealing ring structures altogether.

A sealing ring 146 is arranged between the positioning outer ring 13 and the second sealing ring 143, an annular notch is further formed in a port of the sealing cavity shell 14, the sealing ring 146 is arranged inside the notch, the sealing ring 146 is arranged between the sealing cavity shell 14 and the first sealing ring 142, the three sealing rings 146 respectively seal three positions, the sealing ring 146 at the port of the sealing cavity shell 14 provides a sealing effect with the shaft sleeve 10, the sealing ring 146 between the positioning outer ring 13 and the second sealing ring 143 is used for providing a sealing effect between the positioning outer ring 13 and the second sealing ring 143, and the sealing ring 146 between the sealing cavity shell 14 and the first sealing ring 142 is used for sealing the sealing cavity shell 14 and the first sealing ring 142.

Wherein, the inner side of the filler 11 is provided with a filler cavity 112, the sealing mechanism 12 is clamped in the filler cavity 112, the joint of the port at one side of the filler 11 and the shaft sleeve 10 is provided with a notch, and the thickness of the notch is 0.15-0.25 mm.

The working principle is as follows: when using, form triple sealed effect through the triple sealing washer 146 that sets up, tight mechanical seal structure is provided, in addition through the dual dead axle ring 15 that sets up, can provide the sealed effect at the port department, the inlayer dead axle ring is used for fixing, outer dead axle ring 15 is used for spacingly, guarantee stable in structure, still set up orifice plate 132 in cooling water interface 131 inboard in addition, reduce the velocity of flow through orifice plate 132, make the velocity of water reduce, make the cooling water can slowly pass through cooling water interface 131, make the inside structure of cooling water full contact that gets into, strengthen the cooling effect.

It is noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus.

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

Claims (10)

1. The utility model provides an improved generation unit centrifugal pump's shaft seal device, includes axle sleeve (10), the outside of axle sleeve (10) is provided with filler (11) and sealing mechanism (12), the outside of sealing mechanism (12) is provided with cooling water interface (131), its characterized in that: the sealing mechanism (12) is characterized in that a fixed shaft ring (15) is arranged on one side of the sealing mechanism (12), a throttling orifice plate (132) is further arranged on the inner side of a port of the cooling water interface (131), and the sealing mechanism (12) comprises a sealing cavity shell (14) and a positioning outer ring (13).

2. The improved shaft seal device of a stand-alone centrifugal pump according to claim 1, wherein: a first embedded groove (141) is formed in the outer side of the sealing cavity shell (14), and a first sealing ring (142) and a second sealing ring (143) are arranged on the inner side of the first embedded groove (141).

3. The improved shaft seal device of a stand-alone centrifugal pump according to claim 2, wherein: a notch is arranged on the inner side of the joint between the first sealing ring (142) and the second sealing ring (143), and a supporting ring (144) is arranged on the inner part of the notch.

4. The improved shaft seal device of a stand-alone centrifugal pump according to claim 2, wherein: the outer surface of the second sealing ring (143) is provided with a second embedded groove (145), and the inner side of the positioning outer ring (13) is provided with a bulge matched with the second embedded groove (145).

5. The improved shaft seal device of a stand-alone centrifugal pump according to claim 4, wherein: and a sealing ring (146) is arranged between the positioning outer ring (13) and the second sealing ring (143).

6. The improved shaft seal device of a stand-alone centrifugal pump according to claim 1, wherein: the port department of sealed chamber shell (14) has still seted up annular notch, the inside in notch is provided with sealing washer (146).

7. The improved shaft seal device of a stand-alone centrifugal pump according to claim 2, wherein: a sealing ring (146) is arranged between the sealing cavity shell (14) and the first sealing ring (142).

8. The improved shaft seal device of a stand-alone centrifugal pump according to claim 1, wherein: the number of the fixed shaft rings (15) is two, a limit ring (17) is further arranged between the fixed shaft rings (15) and the sealing mechanism (12) on the inner side, and a fixed shaft screw (16) is arranged on the inner side of the fixed shaft rings (15) on the inner side.

9. The improved shaft seal device of a stand-alone centrifugal pump according to claim 1, wherein: the inner side of the packing (11) is provided with a packing cavity (112), and the sealing mechanism (12) is clamped in the packing cavity (112).

10. The improved shaft seal device of a stand-alone centrifugal pump according to claim 1, wherein: a notch is formed in the joint of the port on one side of the filler (11) and the shaft sleeve (10), and the thickness of the notch is 0.15-0.25 mm.

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