CN2384005Y

CN2384005Y - Split-combined double screw pump

Info

Publication number: CN2384005Y
Application number: CN 99218144
Authority: CN
Inventors: 袁道幸
Original assignee: Individual
Current assignee: Individual
Priority date: 1999-07-25
Filing date: 1999-07-25
Publication date: 2000-06-21
Anticipated expiration: 2009-07-25

Abstract

The utility model discloses a split-combined double screw pump, comprising a pump body, a front end cover, a rear end cover, an active screw rod, a driven screw rod, a lining, a bearing box, a pair of friction wheels, a sealing press cover and a rear cover. The utility model is characterized in that the front end cover and the rear end cover are respectively arranged on two side faces of the pump body and are coupled and fastened by a screw bolt, combining a pump casing. Oil return pipelines are arranged on the oil inlet, the oil outlet, the front end cover and the rear end cover of the pump body and are respectively communicated with the bearing seat and a rear cover cavity, lubricating the bearing. Compared with an integral double screw pump, the utility model has simple manufacturing process, easy processing and long service life.

Description

The separate assembling two screw pump

The utility model relates to the oil pump class, relates in particular to a kind of separate assembling two screw pump.

Two screw pump belongs to the displacement pump type by action principle, by the screw rod transmission liquid of engagement rotation.The liquid that the is transmitted motion that in pump case, goes ahead, and when screw rod evenly rotates, can guarantee liquid stream successively, and do not produce eddy current and foaming.Its advantage is a reliable effect, and suction capacity is arranged, noise free and efficient height in the work.Two screw pump is widely used in transfer oil, lubricant oil, heavy oil and has other petroleum products of greasy property.Two screw pump been has just has been researched and developed production and extensive use abroad as far back as the 50-60 age.Because the pump case of external two screw pump design is whole, the internal structure complexity, the casting difficulty is big, can not contain sand grains in the use, otherwise inner remaining sand grains may cause screw pump stuck.Sand removal work is heavy, and is difficult for handling clean.Initiatively screw rod, the lubricated of driven screw rod bearings at both ends are to realize by screw rod center very long axial bore and radial hole oil return system in addition, and this structure can cause the big and weakening screw rod working strength of difficulty of processing.This pump structure form has been done introduction at inside information " chemical industry and universal machine reference " the P85-86 page or leaf of nineteen eighty-two China Machine Press's publication.

The purpose of this utility model provides that a kind of casting technique is simple, sand removal is convenient, processing and fabricating is easy, cost of production is low, the separate assembling two screw pump of long service life.

Existing two screw pump is made up of whole pump case, active screw rod, driven screw rod, lining, bearing support, a pair of friction wheel, sealing gland, bonnet etc.The technical solution of the utility model is existing whole pump case to be improved be designed to front cover, the pump housing, rear end cover three parts, in the pump housing bi-side front cover, rear end cover are set respectively, fastening with Bolt Connection, form pump case, oil return system is realized in the front and rear cover and the pump housing, that is: filler opening and the front cover at the pump housing is provided with the return line that communicates with bearing support respectively, the return line that communicates with the bonnet chamber in pump housing oil outlet and rear end cover setting.

The utility model compared with the prior art, its advantage is:

1, because whole pump case is divided into front cover, the pump housing, rear end cover three parts, it is simple that casting becomes, and front cover, the pump housing, rear end cover sand removal conveniently are easy to handle clean, can be unclean because of the sand grains processing because of existing whole pump case, and cause the generation that screw pump is stuck, damage phenomenon.

2, be provided with the return line that communicates with bearing support and bonnet chamber respectively at pump housing oil inlet and outlet and forward and backward end cap, constitute oil return system, avoided the processing of big, the demanding screw axial deep hole of difficulty of processing, reduced cost of production, improve the screw rod working strength, prolonged working life.

3, easy accessibility is easy to clean.

The utility model will be further described below in conjunction with drawings and Examples.

Fig. 1 is the utility model sectional view.

Fig. 2 is the utility model plan view.

As shown in Figure 1, be provided with front cover 2, rear end cover 3 respectively in the bi-side of the pump housing 1.For the ease of installing and locating, the pump housing 1 both sides and and the surface of contact of front cover 2, rear end cover 3 be designed to concavo-convex interface.Installation steps: in the pump housing 1 of 1. active screw rod 4 and driven screw rod 5 being packed into simultaneously; Front cover 2 and rear end cover 3 contrapositions that 2. lining 6 will be housed are installed on the pump housing 1 both sides, use bolton, form pump case; 3. bearing support 7 is contained on the front cover 2, bearing 8 is packed into initiatively in the screw rod 4 and bearing support 7, and lock with round nut; 4. a pair of friction wheel 9 is installed on active screw rod 4, the driven screw rod 5, and fastening with round nut; 5. initiatively the extension of screw rod 4 is loaded onto mechanical seal 10, loads onto sealing gland 11 then, and uses bolton; 6. load onto bonnet 12, and use bolton.Bonnet 12 is designed to the sphere shape of evagination, more can bear the pressure of high pressure oil.

As shown in Figure 2, filler opening and front cover 2 at the pump housing 1 are provided with return line 13, communicate with bearing support 7, and the high pressure oil of 14 li of hyperbaric chambers is penetrated in the bearing support 7 from the gap between lining 6 and the principal and subordinate's screw rod like this, flow back to low-pressure cavity 15 by oil returning tube 13 again, thereby lubricated bearing.Oil outlet and rear end cover 3 at the pump housing 1 are provided with return line 13 equally, communicate with bonnet chamber 16, and the high pressure oil that hyperbaric chamber is 14 li is penetrated into low-pressure cavity 15 by gap between lining 6 and the principal and subordinate's screw rod, has lubricated bearing (seeing in conjunction with Fig. 1) equally.The low pressure oil of coming in from the pump housing 1 filler opening during use, flows out from the pump housing 1 oil outlet to hyperbaric chamber 14 by principal and subordinate's screw engages rotational conveyance.

Claims

1, a kind of separate assembling two screw pump that comprises the pump housing, front cover, rear end cover, active screw rod, driven screw rod, lining, bearing support, a pair of friction wheel, sealing gland, bonnet, it is characterized in that pump housing bi-side are provided with front cover, rear end cover respectively, fastening with Bolt Connection, be combined into pump case; The return line that communicates with bearing support in the filler opening and the front cover setting of the pump housing, the return line that communicates with the bonnet chamber in pump housing oil outlet and rear end cover setting.

2, separate assembling two screw pump according to claim 1 is characterized in that the surface of contact of pump housing bi-side and front cover, rear end cover is designed to concavo-convex interface.

3,, it is characterized in that bonnet is designed to the sphere shape of evagination according to the described separate assembling two screw pump of claim.