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CN-224228854-U - High-tightness double-screw pump

CN224228854UCN 224228854 UCN224228854 UCN 224228854UCN-224228854-U

Abstract

The utility model relates to the technical field of screw pumps and discloses a high-tightness double-screw pump, which comprises an outer shell and a screw arranged in the outer shell, wherein the outer shell comprises a first sub-shell and a second sub-shell which are spliced, a bolt is connected between the first sub-shell and the second sub-shell, a sealing mechanism is arranged between the first sub-shell and the second sub-shell, the sealing mechanism comprises a sheet-shaped sealing ring, the sealing ring is abutted between the first sub-shell and the second sub-shell, a first bulge is arranged on one side, close to the sealing ring, of the first sub-shell, a second bulge is arranged on one side, close to the sealing ring, of the second sub-shell, the first bulge and the second bulge are abutted on the sealing ring, the first bulge and the second bulge are arranged in a plurality, and the first bulge and the second bulge are arranged in a staggered mode. The sealing mechanism has the advantages of simple structure and low production cost, and the sealing mechanism increases the tightness between the first sub-shell and the second sub-shell, so that the problem of liquid leakage is avoided, and the use is safe and reliable.

Inventors

  • YAO RONGPING

Assignees

  • 拉法泵业科技（宁波）有限公司

Dates

Publication Date
20260512
Application Date
20250520

Claims (10)

  1. 1. The utility model provides a high leakproofness's double screw pump, includes the shell body and set up in screw rod in the shell body, the shell body is including first minute casing (2) and the second minute casing (3) of concatenation mutually, its characterized in that, be connected with bolt (4) between first minute casing (2) with be provided with sealing mechanism between second minute casing (3), sealing mechanism includes flaky sealing washer (51), sealing washer (51) butt in between first minute casing (2) and second minute casing (3), one side that first minute casing (2) are close to sealing washer (51) is provided with first arch (21), one side that second minute casing (3) are close to sealing washer (51) is provided with second arch (31), first arch (21) with second arch (31) all butt in on sealing washer (51), first arch (21) with second arch (31) all cross a plurality of first minute casings (21) and second minute casing (3) in proper order the boss (31).
  2. 2. The high-tightness double-screw pump according to claim 1, wherein the first sub-housing (2), the sealing ring (51) and the second sub-housing (3) are respectively provided with a mounting through groove for mounting the bolt (4), the bolt (4) comprises a stud (402), the sealing mechanism further comprises a sealing sleeve (52) arranged on the outer side of the stud (402), the outer wall of the sealing sleeve (52) abuts against the inner wall (401) of the mounting through groove, and the first bulge (21) and the second bulge (31) are arc-shaped bulges.
  3. 3. The high-tightness double-screw pump according to claim 2, characterized in that one end of the sealing sleeve (52) is annularly provided with a first guiding inclined surface (521), and the first guiding inclined surface (521) is used for guiding the sealing sleeve (52) into the mounting through groove.
  4. 4. The high-tightness double-screw pump according to claim 2, wherein the sealing sleeve (52) is made of rubber, and the sealing sleeve (52) is formed outside the stud (402) through an injection molding and encapsulation process.
  5. 5. The high-tightness double-screw pump according to claim 1, wherein a first flange (22) is annularly arranged on the first sub-housing (2), a second flange (32) corresponding to the first flange (22) is annularly arranged on the second sub-housing (3), the sealing ring (51) is abutted between the first flange (22) and the second flange (32), and the bolts (4) sequentially penetrate through the first flange (22), the sealing ring (51) and the second flange (32).
  6. 6. The high-tightness double-screw pump according to claim 1, wherein one end of the bolt (4) is in threaded connection with a nut (6), the first sub-housing (2) and the second sub-housing (3) are locked and fixed by the bolt (4) and the nut (6), and the sealing ring (51) is abutted between the first sub-housing (2) and the second sub-housing (3) by the locking force between the first sub-housing (2) and the second sub-housing (3).
  7. 7. The high tightness twin-screw pump according to claim 6, characterized in that a first gasket (71) is in abutment between the screw cap (6) and the second sub-housing (3).
  8. 8. The high tightness twin-screw pump according to claim 7, wherein the bolt (4) further comprises a bolt head (403), a second gasket (72) being in abutment between the bolt head (403) and the first sub-housing (2).
  9. 9. The high-tightness double screw pump according to claim 8, wherein said first gasket (71) and said second gasket (72) are both made of polytetrafluoroethylene.
  10. 10. The high-tightness double-screw pump according to any of claims 1-9, wherein a positioning protrusion (23) is annularly arranged on one side of the first sub-housing (2) close to the second sub-housing (3), a positioning groove (33) corresponding to the positioning protrusion (23) is annularly arranged on the second sub-housing (3), a second guiding inclined plane (231) is arranged at one end of the positioning protrusion (23), and the second guiding inclined plane (231) is used for guiding the positioning protrusion (23) into the positioning groove (33).

Description

High-tightness double-screw pump Technical Field The utility model relates to the technical field of screw pumps, in particular to a high-tightness double-screw pump. Background The screw pump is a rotary pump which conveys liquid or pressurizes the liquid by means of the volume change and movement of a meshing space formed by the pump body and the screw, and the screw pump is divided into a single screw pump, a double screw pump, a triple screw pump and the like according to the number of screws. When the driving screw rotates, the driving screw drives the driven screw meshed with the driving screw to rotate together, the volume of the screw meshing space at one end of the suction cavity is gradually increased, the pressure is reduced, and liquid enters the meshing space under the action of pressure difference; when the volume is increased to the maximum to form a sealed cavity, the liquid continuously moves in the sealed cavities along the axial direction until reaching one end of the discharging cavity, and the volume of the screw meshing space at one end of the discharging cavity is gradually reduced to discharge the liquid. In order to facilitate the manufacture and reduce the manufacturing cost, the outer shells of the existing double-screw pumps are formed by splicing a plurality of (two or more) sub-shells, but the existing double-screw pumps are easy to leak liquid at the splicing positions of the sub-shells, so that the waste of the conveyed liquid is caused, and if the leaked liquid has pollution, the problems of surrounding environment pollution or human health hazard are also caused. Disclosure of utility model In order to solve at least one aspect of the problems, the utility model provides a high-tightness double-screw pump, which comprises an outer shell and a screw rod arranged in the outer shell, wherein the outer shell comprises a first sub-shell and a second sub-shell which are spliced, a bolt is connected between the first sub-shell and the second sub-shell, a sealing mechanism is arranged between the first sub-shell and the second sub-shell, the sealing mechanism comprises a sheet-shaped sealing ring, the sealing ring is abutted between the first sub-shell and the second sub-shell, a first bulge is arranged on one side, close to the sealing ring, of the first sub-shell, a second bulge is arranged on one side, close to the sealing ring, of the second sub-shell, the first bulge and the second bulge are abutted on the sealing ring, a plurality of bolts are arranged between the first bulge and the second bulge, the bolts sequentially penetrate through the first sub-shell, the sealing ring and the second sub-shell are staggered, and the high-tightness double-screw pump is simple in production structure, and the safety problem of the safety leakage of the first sub-shell is avoided. Optionally, the first sub-shell, the sealing ring and the second sub-shell are respectively provided with a mounting through groove for mounting the bolt, the bolt comprises a stud, the sealing mechanism further comprises a sealing sleeve arranged on the outer side of the stud, the outer wall of the sealing sleeve abuts against the inner wall of the mounting through groove, and the first bulge and the second bulge are arc-shaped bulges. Optionally, a first guiding inclined plane is annularly arranged at one end of the sealing sleeve, and the first guiding inclined plane is used for guiding the sealing sleeve into the mounting through groove. Optionally, the sealing sleeve is made of rubber, and is formed on the outer side of the stud through an injection molding and encapsulation process. Optionally, the first sub-shell is provided with a first flange in an annular manner, the second sub-shell is provided with a second flange corresponding to the first flange in an annular manner, the sealing ring is abutted between the first flange and the second flange, and the bolts sequentially penetrate through the first flange, the sealing ring and the second flange. Optionally, one end threaded connection of bolt has the nut, through the bolt with the nut will first minute casing with the second divides the casing locking is fixed, through the locking force between first minute casing with the second divides the casing, so that the sealing washer supports tightly between first minute casing with the second divides the casing. Optionally, a first gasket is abutted between the nut and the second sub-housing. Optionally, the bolt further comprises a bolt head, and a second gasket is abutted between the bolt head and the first sub-shell. Optionally, the first gasket and the second gasket are made of polytetrafluoroethylene. Optionally, a positioning protrusion is annularly arranged on one side of the first sub-shell, which is close to the second sub-shell, a positioning groove corresponding to the positioning protrusion is annularly arranged on the second sub-shell, a second guiding inclined plane is arranged at one end of the