JPH044564U

JPH044564U -

Info

Publication number: JPH044564U
Application number: JP4504990U
Authority: JP
Priority date: 1990-04-26
Filing date: 1990-04-26
Publication date: 1992-01-16

Description

[Brief explanation of drawings]

第１図は本考案にかかる水中ポンプ用メカニカ
ルシールの半部断面図、第２図はバツクアツプリ
ングの一部断面図、第３図および第４図は他の実
施例を示す要部に関する半部断面図、第５図は従
来の水中ポンプ用メカニカルシールの半部断面図
、第６図は第５図の−線断面図、第７図は押
し金の斜視図で、第８図は第５図において、土砂
等が堆積した状態を示す部分斜視図である。１……モータ室側ハウジング、２……ポンプ室
側ハウジング、３……回転軸、３ａ……段部、４
……シートリング、５……パツキン、６……従動
リング、７……締付リング、８……ゴムベローズ
、８ａ……筒部、８ｂ……蛇腹部、８ｃ……鍔部
、１２……密封端面、１３……バツクアツプリン
グ、１６……コイルスプリング、１７……空間、
１８……プレート、Ａ……モータ室、Ｂ……ポン
プ室、Ｃ……オイルバス、Ｓａ……第１メカニカ
ルシール、Ｓｂ……第２メカニカルシール。 FIG. 1 is a half sectional view of a mechanical seal for a submersible pump according to the present invention, FIG. 2 is a partial sectional view of a backup spring, and FIGS. 3 and 4 are half sectional views of main parts showing other embodiments. 5 is a half sectional view of a conventional mechanical seal for a submersible pump, FIG. 6 is a sectional view taken along the line -- in FIG. 5, FIG. 7 is a perspective view of the pusher, and FIG. 5 is a partial perspective view showing a state in which earth and sand etc. are accumulated in FIG. 5. FIG. DESCRIPTION OF SYMBOLS 1...Motor chamber side housing, 2...Pump chamber side housing, 3...Rotating shaft, 3a...Step part, 4
... Seat ring, 5 ... Packing ring, 6 ... Driven ring, 7 ... Tightening ring, 8 ... Rubber bellows, 8a ... Cylinder part, 8b ... Bellows part, 8c ... Flange part, 12 ... Sealed end surface, 13...Backup spring, 16...Coil spring, 17...Space,
18... Plate, A... Motor chamber, B... Pump chamber, C... Oil bath, Sa... First mechanical seal, Sb... Second mechanical seal.

Claims

[Claims for Utility Model Registration] (1) An oil bath is provided between the motor chamber side housing and the pump chamber side housing, and the motor chamber and the oil bath and the oil bath and the pump chamber are connected between the two housings and the oil bath. In the mechanical seal for a submersible pump, which is sealed by two sets of first and second mechanical seals disposed respectively on the rotating shaft of the submersible pump, the second mechanical seal on the pump chamber side is fixed to the pump side housing, and a seat ring is fixed to the pump side housing. On the other hand, one end side cylindrical part of the rubber bellows is fixed to the rotating shaft by a tightening ring, and the other end side flange part of the rubber bellows and a driven ring are connected via a back-up spring along the bellows part of the rubber bellows. A mechanical seal for a submersible pump, characterized in that the driven ring is clamped and integrated with a pusher metal, and the driven ring is pressed against the seat ring by a spring to seal the sealed end surface. (2) providing the rotating shaft with a small diameter portion having a step;
The cylindrical portion of the rubber bellows of the second mechanical seal is attached to the small diameter portion, and the end portion of the cylindrical portion is brought into contact with the stepped portion to prevent the rubber bellows from moving toward the motor chamber side. The mechanical seal for a submersible pump according to claim 1.