CN201705713U

CN201705713U - Multistage centrifugal pump equipped with axial displacement sealing device

Info

Publication number: CN201705713U
Application number: CN201020246485XU
Authority: CN
Inventors: 常世财; 冯守兵; 袁德忠
Original assignee: Individual
Current assignee: Chang Shicai; Feng Shoubing; Yuan Dezhong
Priority date: 2010-07-05
Filing date: 2010-07-05
Publication date: 2011-01-12
Anticipated expiration: 2020-07-05

Abstract

The utility model relates to a multistage centrifugal pump, especially relates to a multistage centrifugal pump equipped with an axial displacement sealing device. The multistage centrifugal pump includes a pump shaft, a vice impeller box, a vice impeller installed in the vice impeller box, a sealing body, a bearing box, a bearing, a bearing interstage sleeve, a blocking nut, a perforated end cover and a nonporous end cover that are successively disposed on the pump shaft from left to right. The multistage centrifugal pump is characterized in that the left end of the vice impeller is provided with a balance mechanism, between the balance mechanism and the pump shaft is installed a shaft protecting sleeve which is cooperated with a sealing sleeve via keyways, a frame oil seal is arranged between the sealing sleeve and the vice impeller, the front end of the sealing sleeve is fixed on the vice impeller via a flange, the rear end of the pump shaft cooperates with a sealed bearing, the sealed bearing is installed in a sealed bearing body, the bearing box is connected to the sealing body. The utility model solves the problem of seal leakage caused by the wearing of balance mechanisms and prolongs the service lifetime of multistage centrifugal pumps.

Description

The multistage centrifugal pump that has the axial displacement seal arrangement

Technical field

The utility model relates to a kind of multistage centrifugal pump, especially relates to a kind of multistage centrifugal pump that has the axial displacement seal arrangement.

Background technique

At present, known multistage centrifugal pump longitudinal balance state is dynamic, and the rotor of pump is in the equilibrium position left and right displacement, and pump generally all adopts balance plate dish device.When the change of pump operating mode, the balance plate dish may wear to a certain degree, and the axial displacement of pump strengthens.Because multistage pump uses separately mechanical seal in sealing, when pump shaft was subjected to displacement, the seal ring of mechanical seal deformed easily, or had reasons such as impurity enters between the dynamic and static ring minute surface and make pump be easy to produce to leak.

Summary of the invention

The purpose of this utility model is to overcome the deficiencies in the prior art, solves the increasing axial displacement of multistage centrifugal pump abrasion equilibration mechanism and causes the problem of seal leakage, the multistage centrifugal pump that has the axial displacement seal arrangement working life of raising multistage centrifugal pump.

The utility model is realized in the following way:

A kind of multistage centrifugal pump that has the axial displacement seal arrangement, it comprises pump shaft, be combined with sub-propeller letter body on the pump shaft from left to right successively, be installed in the sub-propeller in the sub-propeller letter body, seal, bearing letter body, bearing, the bearing interstage sleeve, locking nut, porose end cap and atresia end cap, it is characterized in that: the left end at above-mentioned sub-propeller is equipped with balanced controls, between balanced controls and the above-mentioned pump shaft protective shaft sleeve is installed, this protective shaft sleeve cooperates by the same stuffing box gland of keyway, between stuffing box gland and sub-propeller, be provided with outside framework oil seal, the front end of stuffing box gland is fixed on the above-mentioned sub-propeller by flange, at described pump shaft rear end fitted seal bearing, stuffing box bearing is contained in the stuffing box bearing body, bearing letter body links to each other with seal, described porose end cap and atresia end cap are contained on the bearing letter body, be provided with butter and chew on bearing letter body.

On between the stationary ring on described outside framework oil seal and the described sub-propeller letter body, be combined with Double End machine envelope;

Seal up at described Double End machine and to be provided with the bar that splashes, the ring that splashes is arranged on the bar that splashes;

Described stuffing box bearing is contained in described stuffing box gland rear end and the stuffing box bearing body with jump ring.

The utility model has following effect:

1) structure uniqueness: it comprises pump shaft the device that the utility model provides, be combined with sub-propeller letter body on the pump shaft from left to right successively, be installed in the sub-propeller in the sub-propeller letter body, seal, bearing letter body, bearing, the bearing interstage sleeve, locking nut, porose end cap and atresia end cap, it is characterized in that: the left end at above-mentioned sub-propeller is equipped with balanced controls, between balanced controls and the above-mentioned pump shaft protective shaft sleeve is installed, this protective shaft sleeve cooperates by the same stuffing box gland of keyway, between stuffing box gland and sub-propeller, be provided with outside framework oil seal, the front end of stuffing box gland is fixed on the above-mentioned sub-propeller by flange, at described pump shaft rear end fitted seal bearing, stuffing box bearing is contained in the stuffing box bearing body, bearing letter body links to each other with seal, described porose end cap and atresia end cap are contained on the bearing letter body, be provided with butter and chew on bearing letter body.

2) can solve the seal leakage of pump: the device that the utility model provides is installed balanced controls on the multistage centrifugal pump pump shaft, and near balanced controls protective shaft sleeve bearing interstage sleeve bearing lock nuts being installed is pump rotor seal arrangement slide member.Have keyway to cooperate with key with the stuffing box gland keyway on protective shaft sleeve, the stuffing box gland front end has flange fixed joint impeller, has outside framework oil seal that rotor is slided between stuffing box gland and sub-propeller and seals, and sub-propeller is installed in that pump is not have to leak in running in the sub-propeller letter body.

3) working life of the life-span of lengthening pump seal, raising multistage centrifugal pump: have Double End machine envelope to cooperate on the device stuffing box gland that the utility model provides with sub-propeller letter body stationary ring and seal, sealed up the bar that splashes at the Double End machine, the ring that splashes has been arranged on the bar that splashes machine envelope splash lubrication.Seal links to each other with sub-propeller letter body, stuffing box bearing is contained in stuffing box gland rear end and the stuffing box bearing body, dress stuffing box bearing body is fixed seal arrangement on the seal, bearing letter body links to each other with seal, porose end cap and atresia end cap are contained on the bearing letter body, chew oiling to bearing lubrication by butter, thus the life-span of lengthening pump seal.

4) pump seal that provides of the utility model is not with the sealing means of pump rotor move left and right, pump is that the motive sealing sub-propeller seals in running, when stopping, carrying out static seal with the machine envelope, static seal device has special-purpose lubricating chamber to make static seal oil lubricating machine envelope in the running, and Seal cage has bearing fixing machine envelope position to prevent to leak.

Description of drawings

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

Embodiment

A kind of multistage centrifugal pump that has the axial displacement seal arrangement, it comprises pump shaft 15, be combined with sub-propeller letter body 8 on the pump shaft 15 from left to right successively, be installed in the sub-propeller 7 in the sub-propeller letter body 8, seal 23, bearing letter body 12, bearing 18, bearing interstage sleeve 19, locking nut 17, porose end cap 16 and atresia end cap 20, as shown in Figure 1: the left end at above-mentioned sub-propeller 7 is equipped with balanced controls 3, between balanced controls 3 and the above-mentioned pump shaft 15 protective shaft sleeve 4 is installed, this protective shaft sleeve 4 cooperates by the same stuffing box gland 5 of keyway, between stuffing box gland 5 and sub-propeller 7, be provided with outside framework oil seal 6, the front end of stuffing box gland 5 is fixed on the above-mentioned sub-propeller 7 by flange, at described pump shaft 15 rear end fitted seal bearings 21, stuffing box bearing 21 is contained in the stuffing box bearing body 22, bearing letter body 12 links to each other with seal 23, described porose end cap 16 and atresia end cap 20 are contained on the bearing letter body 12, on bearing letter body 12, be provided with butter and

chew

11,14.

On between the stationary ring 1 on described outside framework oil seal 6 and the described sub-propeller letter body 8, be combined with Double End machine envelope 2.

On described Double End machine envelope 2, be provided with the bar 10 that splashes, the ring 9 that splashes is arranged on the bar 10 that splashes.

Described stuffing box bearing 21 usefulness jump rings 13 are contained in described stuffing box gland 5 rear ends and the stuffing box bearing body 22.

Claims

1. multistage centrifugal pump that has the axial displacement seal arrangement, it comprises pump shaft (15), be combined with sub-propeller letter body (8) on the pump shaft (15) from left to right successively, be installed in the sub-propeller (7) in the sub-propeller letter body (8), seal (23), bearing letter body (12), bearing (18), bearing interstage sleeve (19), locking nut (17), porose end cap (16) and atresia end cap (20), it is characterized in that: the left end at above-mentioned sub-propeller (7) is equipped with balanced controls (3), between balanced controls (3) and the above-mentioned pump shaft (15) protective shaft sleeve (4) is installed, this protective shaft sleeve (4) cooperates by the same stuffing box gland of keyway (5), between stuffing box gland (5) and sub-propeller (7), be provided with outside framework oil seal (6), the front end of stuffing box gland (5) is fixed on the above-mentioned sub-propeller (7) by flange, at described pump shaft (15) rear end fitted seal bearing (21), stuffing box bearing (21) is contained in the stuffing box bearing body (22), the same seal of bearing letter body (12) (23) links to each other, described porose end cap (16) and atresia end cap (20) are contained on the bearing letter body (12), on bearing letter body (12), be provided with butter and chew (11,14).

2. the multistage centrifugal pump that has the axial displacement seal arrangement as claimed in claim 1 is characterized in that: be combined with Double End machine envelope (2) between the stationary ring (1) on described outside framework oil seal (6) and the described sub-propeller letter body (8).

3. the multistage centrifugal pump that has the axial displacement seal arrangement as claimed in claim 2 is characterized in that: be provided with the bar that splashes (10) on described Double End machine envelope (2), the ring (9) that splashes is arranged on the bar that splashes (10).

4. the multistage centrifugal pump that has the axial displacement seal arrangement as claimed in claim 1 is characterized in that: described stuffing box bearing (21) is contained in described stuffing box gland (5) rear end and the stuffing box bearing body (22) with jump ring (13).