CN2292921Y - Leakless multistage centrifugal pump - Google Patents

Abstract

The utility model relates to a leakless multi-stage centrifugal pump. The shaft extending position at the discharging side of the pump is accommodated in a pump body; the shaft extending position at the sucking side of the pump is provided with primary and auxiliary seal; the primary seal is composed of an annular fluidic device composed of an inner and an outer sleeve tubes; the sealing effect of the primary seal can be regulated to the optimal state manually when the pump runs; the auxiliary seal is used for sealing liquid in the pump when the pump stops. The utility model has the advantages that conveying liquid does not leak when the pump runs and stops; the shaft sealing structure is reasonable and simple, and the sealing effect is good; the capability for sealing liquid of the primary seal is automatically strengthened with the increase of the outlet pressure of the pump.

Description

A kind of nothing is leaked multistage centrifugal pump

The utility model relates to a kind of nothing and leaks multistage centrifugal pump.

At present, desiring to make multistage centrifugal pump to keep not having under certain pump operation operating mode leaks, have only employing motive sealing (screw rod or pair impeller) to be primary seal, filler, lip circle or centrifugal parking sealer are the combined method of auxilliary sealing, because after the physical dimension of the core component screw rod of motive sealing or pair impeller is determined, its maximum sealing liquid ability has also just been determined, be nonadjustable, cross when low when the suction pressure of pump, may suck air, influence the normal operation of pump, and the suction pressure of pump is too high, when surpassing the sealing liquid ability of motive sealing, sealing can be lost efficacy again, simultaneously, a screw rod and a pair impeller are moving element, its radially or axial clearance owing to wearing and tearing strengthens after, the sealing liquid ability will sharply descend, in addition the inefficacy.The rotating speed of pump is high more, and lift is high more, and above-mentioned defective is obvious more.

The purpose of this utility model is at the prior art above shortcomings, provide a kind of nothing to leak multistage centrifugal pump, this pump is in operation, primary seal can regulate not only, and the sealing liquid ability of primary seal also can strengthen automatically along with the increase of delivery side of pump pressure, and do not exist the motion wearing and tearing to cause the problem of seal failure.

The purpose of this utility model is achieved in that a kind of nothing leakage multistage centrifugal pump, adopt annular jet to be sealed into primary seal, comprise filler, the lip circle is made the sealing configuration of auxilliary sealing, what it is characterized in that the right side of the Spit Section of this pump adopts is by bearing support and the sealing configuration of tail-hood cushioning with the screw connection, two lip seal are housed in this bearing support, a bearing guard ring, a cylinder rolling bearing, an O-ring seals, a bearing gland, a convolution diaphragm and a pressing plate, this bearing support also has four or several semi-circular passages, purpose is that the publicly-owned chamber between balancing drum and the Balance disc is communicated with, the effect of convolution diaphragm is the bearing chamber of autobalance roller bearing and the pressure between tail-hood and the formed chamber of bearing support, one balancing pipeline is communicated with the suction chamber of pump with tail-hood and the formed chamber of bearing support, primary seal is the annular jet device that outer sleeve and inner sleeve are formed, wherein an outer sleeve and O shape circle is fixedly mounted on the left side of the suction casing of pump, inner sleeve and O shape circle are fixedly mounted on the letter body of pump, in the letter body of pump the packing seal circle is housed, one liquid guiding tube is communicated with the chamber that spues of pump with chamber between the internal and external casing, all the other component of this pump are all identical with existing common multistage centrifugal pump.

The utility model compared with prior art has the following advantages: 1. because liquid jetting device of the present utility model does not have moving element, therefore do not exist primary seal to cause the problem of seal failure because of the motion wearing and tearing; 2. because primary seal of the present utility model can regulate when pump operation, and the shaft seal structure advantages of simple, when making pump operation and termination of pumping, the phenomenon of carrying liquid to leak outside all can not appear; 3. because primary seal of the present utility model is the annular jet device that is made of internal and external casing, the purpose that strengthens automatically with the increase of delivery side of pump pressure by the sealing liquid ability reasonably selecting the gap of annular jet device nozzle, can reach to make primary seal.

Below in conjunction with accompanying drawing, the utility model is described in detail in detail with most preferred embodiment of the present utility model.

Fig. 1 is a structural representation of the present utility model;

Fig. 2 is the K-K sectional drawing of Fig. 1;

Fig. 3 is the J-J sectional drawing of Fig. 1.

As Fig. 1, Fig. 2, shown in Figure 3, the right side of the utility model Spit Section 13 connects sealing by bearing support 17 and tail-hood 22 cushionings with screw, common cylinder rolling bearing 16 is housed in the bearing support 17, the bearing chamber of this cylinder rolling bearing 16 (E) is equipped with lubricating grease in the chamber, bearing guard ring 15 and two lip seal 14 are equipped with in the left side of cylinder rolling bearing 16, the bearing gland 19 of band O shape seal is equipped with on the right side, the afterbody of this bearing gland 19 connects sealing with convolution diaphragm 20 and pressing plate 21 with screw, four of the interior Zhou Kaiyou of bearing support 17 or several semi-circular passages, balancing pipeline 24 is communicated with intake chamber (B) chamber of pump with the chamber (F) that tail-hood 22 and bearing support 17 form, primary seal is by internal and external casing 4, the 6 annular jet devices that form constitute, wherein outer sleeve 6 and the seal of O shape are screwed the left side of the suction casing 7 that is installed in pump, an inner sleeve 4 and an O shape seal are screwed on the letter body 2 that is installed in pump, packing seal circle 1 is housed in the letter body 2, liquid guiding tube 10 is with the chamber that spues (C) and internal and external casing 4 of pump, chamber between 6 (A) chamber is communicated with, and liquid guiding tube 10 is provided with valve 11.All the other component of the present utility model are all identical with existing common multistage centrifugal pump.

By the semi-circular passage on week in the bearing support 17, make equilibrium liquid that the Balance disc 12 that is installed on the pump shaft 9 or balancing drum 23 release flow to the afterbody of bearing support 17 by these passages, return suction chamber (B) chamber of pump through tail-hood 22, balancing pipeline 24, equilibrium liquid has action of pressure before and after cooling bearing and the balance bearing support concurrently.For a certain reason; variation as bearing support 17 internal and external temperatures; the variation of the axial float of pump rotor and equilibrium liquid pressure etc.; convolution diaphragm 20 will produce distortion; the pressure of chamber (F) chamber two chambers that the bearing chamber of autobalance cylindrical bearing 16 (E) chamber, tail-hood 22 and bearing support 17 form; prevent to carry in the pump liquid to enter in bearing bore (E) chamber of bearing 16 owing to action of pressure; with the protection bearing, the lubricating grease in the bearing chamber of bearing 16 (E) chamber is only just changed when the pump overhaul.

Reasonably choose primary seal internal and external casing 4, the gap H of the 6 annular jet device nozzles that constituted, and the high-pressure delivery liquid in the chamber, the chamber that spues (C) of the Spit Section 13 of pump imported internal and external casings 4 through liquid guiding tube 10, chamber between 6 (H) chamber, spray by liquid jetting device, before nozzle, will form low pressure even negative pressure, produce sealing effect, the pressure in chamber, chamber (C) of spuing is that lift of pump is high more, jet intensity is just strong more, the negative pressure that produces is also just big more, liquid guiding tube 10 is provided with valve 11, and the manual tune valve opening makes sealing reach optimum efficiency to change jet intensity in the running of pump, both no leakages, can not suck air again, the auxilliary sealing 1 in primary seal left side can be a common fillers, also can select other seal type according to usage requirement, no leakage gets final product when satisfying termination of pumping.Under the lower situation of suction chamber when pump operation (B) cavity pressure, can directly equilibrium liquid be imported chamber (A) chamber that internal and external casing 4,6 forms through balancing pipeline 24, to form necessary jet intensity, satisfy seal request, need not to quote the high-pressure delivery liquid in chamber, chamber (C) of spuing, can improve the operational efficiency of pump like this.

The sliding bearing that also can adopt stupalith to make replaces common cylinder rolling bearing 16, at this moment, the parts lip circle 14 of these bearing 16 front and back, bearing guard ring 15, O shape seal 18, bearing gland 19, pressing plate 21 can save.

Claims (2)

1. one kind is not had the multistage centrifugal pump of leakage, adopt annular jet to be sealed into primary seal, comprise filler, the sealing configuration that is sealed into auxilliary sealing of lip circle, what it is characterized in that the right side of the Spit Section (13) of this pump adopts is the sealing configuration that is connect with screw by bearing support (17) and tail-hood (22) cushioning, two lip seal (14) are housed in the bearing support (17), a bearing guard ring (15), a cylinder rolling bearing (16), O shape seal (18), a bearing gland (19), a convolution diaphragm (20), a pressing plate (21), also have four or several semi-circular passages on the interior week of this bearing support (17), balancing pipeline (24) is communicated with suction chamber (B) with the chamber (F) that tail-hood (22) and bearing support (17) form, outer sleeve (6) and O shape seal (5) are fixedly mounted on the left side of suction casing (7), inner sleeve (4) is fixedly mounted on the letter body (2) with O shape seal (3), liquid guiding tube (10) will spue chamber (C) and internal and external casing (4,6) chamber between (A) is communicated with, filler seal (1) is housed in the letter body (2), and all the other component of pump are all identical with existing common multistage centrifugal pump.

2. nothing according to claim 1 is leaked multistage centrifugal pump, it is characterized in that on the liquid guiding tube (10) of this pump valve (11) being installed.

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