CN203488425U

CN203488425U - Centrifugal pump sealing structure and centrifugal pump

Info

Publication number: CN203488425U
Application number: CN201320479320.0U
Authority: CN
Inventors: 王财成
Original assignee: Individual
Current assignee: Individual
Priority date: 2013-08-06
Filing date: 2013-08-06
Publication date: 2014-03-19
Anticipated expiration: 2023-08-06

Abstract

The utility model provides a centrifugal pump sealing structure which is convenient to produce and process, has high assembly accuracy and long service life and has less internal leakage and also provides a centrifugal pump with the application of the centrifugal pump sealing structure. The centrifugal pump sealing structure contains a pump shell, a sealing ring and an impeller. The middle part of a front shroud is provided with a sealing loop and an impeller water-inlet. The sealing loop protrudes out of the surface of the front shroud. The impeller water-inlet is positioned in the sealing ring. A pump shell water-inlet which penetrates through the pump shell is arranged on the pump shell, corresponding to the position of the impeller water-inlet. An annular groove is arranged along the edge of the pump shell water-inlet on the inner wall of the pump shell. The sealing ring contains a first ring body and a second ring body which are connected with each other. The first ring body and the second ring body have the same outer diameter. Inner diameter of the first ring body is less than inner diameter of the second ring body. Thus, a step-like inner wall of the sealing ring is formed. The sealing ring is embedded in the annular groove of the pump shell. The sealing loop is sleeved in the sealing ring. Outer diameter of the sealing loop ranges between inner diameter of the first ring body and inner diameter of the second ring body.

Description

Centrifugal pump sealing configuration and centrifugal pump

Technical field

The utility model relates to centrifugal pump, relates in particular to the sealing configuration of centrifugal pump impeller water inlet.

Background technique

Centrifugal pump is a kind of common pump, and centrifugal pump utilizes vane rotary and makes the centrifugal force of water generates carry out work.

Centrifugal pump generally includes: comprise pump case, seal ring and impeller, the seal ring at impeller intake place and the excesssive gap between pump case can cause the water in pump inner high voltage district to flow to low pressure area through this gap, affect the water-outlet quantity of pump, make the Efficiency Decreasing of centrifugal pump.

Impeller as shown in Figure 1 and seal ring cooperating structure schematic diagram, in prior art, in order to increase in backflow drag reduction, leak, delay institute's working life of impeller and pump case, at pump case and impeller foreign aid junction, seal ring 20 is housed, seal ring is generally an annular solid, impeller comprises front shroud 11, back shroud 12 and pump leaf, and pump leaf is between forward and backward cover plate, and impeller is driven and rotates by power mechanisms such as motors by axis hole 14.Front shroud 11 middle parts are provided with seal ring 13 and impeller intake 15, and described seal ring 13 is raised in front shroud surface, and described impeller intake 15 is positioned at seal ring 13, keep conventionally need to keeping a less gap between seal ring 20 and seal ring 13.Fig. 2 is specifically seen in this gap, and Fig. 2 is the enlarged view of the local A of Fig. 1.From Fig. 2, we can know and find out to have gap between the anchor ring 201 of seal ring and the end face 131 of seal ring.The accuracy of the quality of fit in actual production process between two planes is to be relatively difficult to ensure, when processing, assembly error are when larger, the big or small a0 in gap is difficult to control, if a0 is too small, easily there is the friction between seal ring and seal ring, or a0 is excessive, cause interior leakage to increase, affect the water-outlet quantity of pump.

And in the actual using process of pump, due to the wearing and tearing of seal ring, seal ring, the reasons such as corrosion, easily make the big or small a0 in gap continue to increase, cause equally interior leakage to increase, affect the water-outlet quantity of pump.

Model utility content

The purpose of this utility model is, provides a kind of and is convenient to production and processing, assembly precision is high, long service life, the centrifugal pump sealing configuration that interior leakage is few, and the centrifugal pump that uses this centrifugal pump sealing configuration.

For achieving the above object, the utility model provides a kind of centrifugal pump sealing configuration, and described centrifugal pump sealing configuration comprises pump case, seal ring and impeller;

Described impeller comprises front shroud, back shroud and pump leaf, and described front shroud middle part is provided with seal ring and impeller intake, and described seal ring is raised in front shroud surface, and described impeller intake is positioned at seal ring;

Described pump case is provided with the pump case water intake that runs through pump case in the position of corresponding impeller intake, on pump housing endophragm, along pump case water intake edge, be provided with annular groove;

Described seal ring comprises first ring body and the second annular solid joining, described first ring body is identical with the second annular solid external diameter, the internal diameter of first ring body is less than the internal diameter of the second annular solid, form the inwall of the seal ring of stepped shape, seal ring is embedded in the annular groove of pump case, described seal ring is sheathed in seal ring, and the external diameter of seal ring is between the internal diameter of the first annular body and the internal diameter of the second annular solid.

Preferably, the gap between described seal ring periphery and the second annular solid inwall is the second gap, and the gap between relative seal ring end face and first ring body anchor ring is the first gap, and described the second gap is less than the first gap.

More preferably, described the second gap length is 0.5～0.8mm, and described the first gap length is 1.0～2.5mm.

Preferably, described seal ring is stainless steel sealing ring.

Preferably, described back shroud footpath is upwards provided with stiffening rib.

More preferably, between described stiffening rib and back shroud, be welded to connect.

Preferably, the inwall of the seal ring of described stepped shape is that turning processes.

Preferably, interference fit between described seal ring and the annular groove of pump case.

For realizing second goal of the invention, the utility model also provides a kind of centrifugal pump, and described centrifugal pump adopts the centrifugal pump sealing configuration described in above-mentioned any one.

Be different from the annular solid seal ring of prior art, seal ring inwall of the present utility model is stepped shape, seal ring is wherein sheathed, like this, seal ring end face and step surface form a L shaped gap, this gap comprises two parts, a part is relative seal ring end face and the first gap between first ring body anchor ring, another part is by the second gap between seal ring periphery and the second annular solid inwall, in the process of centrifugal pump work, the liquid of interior leakage via the first gap to the second gap, then flow out, therefore as long as control the size that the size in any one gap in the first gap or the second gap can be controlled leakage, in other words, as long as any one is enough little in the first gap or the second gap, leakage just can be controlled effectively, and the size in control the second gap, its complexity is less than the first gap, because in manufacture and assembly process, after the two center of seal ring and seal ring is determined, circumferentially the precision of location is easily accomplished more accurate.So the utility model, by controlling the size in the second gap, under same making and assembly precision, easily obtains less seal clearance, obtains better sealing effect, obtains larger flow.

And in the utility model, seal clearance is L shaped, therefore at centrifugal pump, use a period of time under same Environmental Conditions, the wearing and tearing of L shaped seal clearance are less than common seal clearance, therefore more easily keep good sealing effect, maintain larger flow.

Accompanying drawing explanation

Fig. 1 is the centrifugal pump sealing configuration generalized section of prior art described in the utility model background technique;

Fig. 2 is the enlarged view of local A described in Fig. 1;

Fig. 3 is centrifugal pump casing structural representation described in the utility model embodiment;

Fig. 4 is centrifugal pump sealing configuration generalized section described in the utility model embodiment;

Fig. 5 is the enlarged view of local B described in Fig. 4;

Fig. 6 is seal ring plan structure schematic diagram described in the utility model embodiment;

Fig. 7 is seal ring cross-sectional view described in the utility model embodiment;

Fig. 8 is centrifugal pump impeller structural representation Fig. 1 described in the utility model embodiment;

Fig. 9 is centrifugal pump impeller structural representation Fig. 2 described in the utility model embodiment.

Label declaration:

1, impeller, 11, front shroud, 12, back shroud, 13, seal ring, 14, axis hole, 15, impeller intake, 16, pump leaf, 17, stiffening rib, 131, seal ring end face, 132, seal ring periphery;

20, seal ring, 201, first ring body anchor ring, the 202, second annular solid inwall;

3, pump case, 30, pump housing endophragm, 31, annular groove, 32, pump case water intake, 33, screw, 34, centrifugal pump water outlet;

7, L shaped gap, the 71, first gap, the 72, second gap;

The size in a0, gap, the size in a1, the first gap, the size in a2, the second gap, the external diameter of R0 first ring body and the second annular solid, the internal diameter of R1, first ring body, the internal diameter of R2, the second annular solid, H1, first ring body height, H2, the second annular solid height.

Embodiment

By describing technology contents of the present utility model, structure characteristics in detail, being realized object and effect, below in conjunction with mode of execution and coordinate accompanying drawing to be explained in detail.

Refer to accompanying drawing, the present embodiment discloses a kind of centrifugal pump, and the sealing configuration that described centrifugal pump adopts comprises pump case 3, seal ring 2 and impeller 1;

As shown in Figure 3, pump case 3 is provided with the pump case water intake 32 that runs through pump case in the position of corresponding impeller intake, on pump housing endophragm 30, along pump case water intake edge, is provided with annular groove 31;

Pump case top is centrifugal pump water outlet 34, and centrifugal pump water outlet 34 can be set to flange arrangement or quick-disassembly structure, is convenient to be connected with pipeline.Pump case outer wall is provided with screw 33, forms flange arrangement, is connected with the dynamic structure such as motor.

Described impeller 1 comprises front shroud 11, back shroud 12 and pump leaf 16, and impeller middle part is provided with axis hole, for being connected with motor shaft.As shown in Figure 9, in some embodiment, in order to strengthen the steadiness of blade wheel structure, back shroud 12 footpaths are upwards provided with stiffening rib 17.

In some embodiment, for ease of processing, between stiffening rib 17 and back shroud 12, be welded to connect.

Front shroud middle part is provided with seal ring 13 and impeller intake 15, and described seal ring 13 is raised in front shroud surface, and described impeller intake 15 is positioned at seal ring 13;

As shown in Figure 6, Figure 7, described seal ring 20 comprises first ring body and the second annular solid joining, the height of first ring body is H1, and the height of the second annular solid is H2, and first ring body is identical with the second annular solid external diameter, the internal diameter R1 of first ring body is less than the internal diameter R2 of the second annular solid, the inwall that forms the seal ring of stepped shape, as shown in Figures 6 and 7, the external diameter of first ring body and the second annular solid is R0, the internal diameter of first ring body is R1, and the internal diameter of the second annular solid is R2.

Seal ring 20 is embedded in the annular groove 31 of pump case, in some embodiment, and for guaranteeing chimeric intensity, interference fit between the annular groove 31 of seal ring 20 and pump case.

Described seal ring 13 is sheathed in seal ring 20, and the external diameter r0 of seal ring is between the internal diameter R1 of the first annular body and the internal diameter R2 of the second annular solid.

Above-mentioned seal ring comprises first ring body and the second annular solid, can not be interpreted as that seal ring comprises in mechanical structure that independently two parts are spliced, in the utility model, seal ring both can be spliced by two parts, also can be an integral body mechanically, or integrated, so-called first ring body and the second annular solid are in order to characterize its structure, in geometrical shape, seal ring are carried out to analytic explanation and the result that obtains.

In certain embodiments, for the ease of processing, seal ring 20 is a whole stainless steel part, and the inwall of the seal ring of stepped shape is that turning processes, so also guarantee integrity and the integrity of seal ring structure, guaranteed mechanical strength and the corrosion resistance of seal ring.Certainly, in other embodiment, seal ring also can be prepared from by techniques such as castings.

As shown in Figure 4, Figure 5, gap between relative seal ring end face 131 and first ring body anchor ring 201 is the first gap 71, gap between described seal ring periphery 132 and the second annular solid inwall 202 is the second gap 72, described the second gap is less than the first gap, as shown in Figure 5, the size in the second gap is a2, and the size in the first gap is a1, a1 > a2.

Seal ring 20 inwalls are stepped shape, seal ring 13 is wherein sheathed, like this, seal ring end face and step surface form a L shaped gap 7, this gap comprises two parts, a part is relative seal ring end face 131 and the first gap 71 between first ring body anchor ring 201, another part is by the second gap 72 between seal ring periphery 132 and the second annular solid inwall 202, in the process of centrifugal pump work, the liquid of interior leakage is via 71 to second gaps 72, the first gap, then flow out, therefore as long as control the size that the size in any one gap in the first gap or the second gap can be controlled leakage, in other words, as long as any one is enough little in the first gap or the second gap, leakage just can be controlled effectively, and the size in control the second gap, its complexity is less than the first gap, because in manufacture and assembly process, after the two center of seal ring and seal ring is determined, circumferentially the precision of location is easily accomplished more accurate.So by controlling the size in the second gap 72, under same making and assembly precision, easily obtain less seal clearance in an embodiment, obtain better sealing effect, obtain larger flow.

In some embodiment, the first gap a1 size is 1.0～2.5mm, and the second gap a2 size is 0.5～0.8mm.

For improving intensity, and guarantee corrosion resistance, in some embodiment, seal ring is stainless steel sealing ring.Can select as required 304 stainless steels or 316 stainless steels etc.

The foregoing is only embodiment of the present utility model; not thereby limit the scope of the claims of the present utility model; every equivalent shapes or Structural Transformation that utilizes the utility model specification and accompanying drawing content to do; or be directly or indirectly used in other relevant technical fields, be all in like manner included in scope of patent protection of the present utility model.

Claims

1. a centrifugal pump sealing configuration, is characterized in that, described centrifugal pump sealing configuration comprises pump case, seal ring and impeller;

2. centrifugal pump sealing configuration according to claim 1, it is characterized in that, gap between relative seal ring end face and first ring body anchor ring is the first gap, and the gap between described seal ring periphery and the second annular solid inwall is the second gap, and described the second gap is less than the first gap.

3. centrifugal pump sealing configuration according to claim 2, is characterized in that, described the first gap length is 1.0～2.5mm, and described the second gap length is 0.5～0.8mm.

4. centrifugal pump sealing configuration according to claim 1, is characterized in that, described seal ring is stainless steel sealing ring.

5. centrifugal pump sealing configuration according to claim 1, is characterized in that, described back shroud footpath is upwards provided with stiffening rib.

6. centrifugal pump sealing configuration according to claim 5, is characterized in that, between described stiffening rib and back shroud, is welded to connect.

7. according to the centrifugal pump sealing configuration described in claim 1 to 6 any one, it is characterized in that, the inwall of the seal ring of described stepped shape is that turning processes.

8. according to the centrifugal pump sealing configuration described in claim 1 to 6 any one, it is characterized in that interference fit between described seal ring and the annular groove of pump case.

9. a centrifugal pump, is characterized in that, described centrifugal pump adopts the centrifugal pump sealing configuration as described in claim 1 to 8 any one.