CN212376864U - Single-suction double-screw pump - Google Patents

Abstract

The utility model provides a single-suction double-screw pump, aims at solving among the prior art common double-screw pump's sealing performance relatively poor, takes place easily when using under the poisonous and harmful high-risk medium operating mode and leaks, and then causes the technical problem of harm to environment and human body. The utility model discloses a pump body and establishing the bearing frame in pump body one end, the one end that the pump body was kept away from to the bearing frame is equipped with the gear box, be equipped with interval parallel arrangement's driving shaft and driven shaft in the pump body, the terminal surface of the pump body is kept away from to the one end protrusion gear box that the pump body was kept away from to the driving shaft, install the scroll cover of mutually supporting and being located the pump body on driving shaft and the driven shaft, be equipped with mechanical seal subassembly between the pump body and the bearing frame, driving shaft and driven shaft pass through bearing assembly and install on the bearing frame.

Description

Single-suction double-screw pump

Technical Field

The utility model relates to a screw pump technical field especially relates to a single-suction double-screw pump.

Background

The screw pump is a positive displacement rotor pump and can be divided into a single screw pump, a double-screw pump, a triple-screw pump and a quintuple-screw pump according to the number of screws, wherein the double-screw pump is a sealed cavity with constant volume formed between a screw sleeve and a pump body or a lining which are mutually meshed on a driving shaft and a driven shaft, and a medium synchronously moves to an outlet of the pump along with the rotation of a screw shaft, thereby realizing the purpose of conveying the pump. The double-screw pump has the characteristics of stable flow, small pressure pulsation, self-suction capability, low noise, high efficiency, long service life and reliable work, and has the outstanding advantages of no vortex formed during medium conveying, insensitivity to the viscosity of the medium and capability of conveying high-viscosity medium.

Chinese patent application No. CN201910231048.6 discloses a cantilever type single-suction small-flow double-screw pump, which comprises a pump body, a bearing seat, a gear box, a driving shaft and a driven shaft arranged in parallel in the pump body; the method is characterized in that: the single side of the bearing block is arranged on one side of the pump body, the pump body is fixed on the bearing block, and the driving shaft and the driven shaft are provided with matched screw sleeves; the driving shaft and the driven shaft are arranged on the driving end of the bearing seat through three rows of angular contact ball bearings; and the ratio I (dj/dl) of the shaft diameter dj of the driving shaft and the driven shaft at the mechanical seal to the shaft diameter dl of the spiral sleeve is 1.37-1.45.

The integral mechanism of the patent is compact, each pump only needs two sets of mechanical seals, the installation size and the weight of the pump are reduced, the manufacturing cost of the pump is reduced, and the fluid can be conveyed by using the double-screw pump with the special structure in special application occasions with low pressure and small flow; however, the double-screw pump has poor sealing performance, is easy to leak when used under the working condition of toxic and harmful high-risk media, and causes harm to the environment and human bodies.

Disclosure of Invention

The utility model discloses an it is relatively poor to overcome the sealing performance of common twin-screw pump among the prior art, takes place easily when using under the poisonous and harmful high-risk medium operating mode and leaks, and then causes the technical problem of harm to environment and human body, provides a single suction twin-screw pump, and mechanical seal subassembly effectively seals the pump chamber, guarantees the twin-screw pump can not have the long-time work of leaking ground under the poisonous and harmful high-risk medium operating mode, and bearing assembly effectively supports main, driven shaft, guarantees the stationarity among the twin-screw pump operation process is higher.

In order to achieve the above purpose, the present invention adopts the following technical solution.

The utility model provides a single-suction double-screw pump, include the pump body and establish the bearing frame in pump body one end, the one end that the pump body was kept away from to the bearing frame is equipped with the gear box, be equipped with interval parallel arrangement's driving shaft and driven shaft in the pump body, the terminal surface that the pump body was kept away from to the one end protrusion gear box that the pump body was kept away from to the driving shaft, install the spiral shell that mutually supports and be located the pump body on driving shaft and the driven shaft, be equipped with mechanical seal subassembly between the pump body and the bearing frame, driving shaft and driven shaft pass through bearing assembly and. The traditional double-screw pump has poor sealing performance, and is easy to leak when used under the working condition of toxic and harmful high-risk media, thereby causing the technical problem of harm to the environment and human bodies. The utility model provides a single-suction double-screw pump, this screw pump is single-suction double-screw pump, can link to each other with drive assembly behind the terminal surface of driving shaft protrusion gear box, when the driving shaft rotates under the drive of drive assembly such as motor, the driving shaft drives the synchronous rotation of driven shaft through drive component, install the screw shell that mutually supports and lie in the pump body on driving shaft and the driven shaft, carry the material to the export runner from the import runner when the screw shell that mutually supports rotates, be equipped with mechanical seal assembly between the pump body and the bearing frame, it has lubricating oil to annotate in the mechanical seal assembly, the pressure of lubricating oil in the mechanical seal assembly is higher than the pressure of medium in the pump chamber about 0.2MPa, when mechanical seal assembly takes place to damage, lubricating oil in the mechanical seal assembly flows in the reverse direction to the pump chamber, thereby effectively prevent the leakage of carrying the medium, single-suction double-screw pump's safety in, in addition, the driving shaft and the driven shaft are arranged on the bearing seat through a bearing assembly, and the bearing assembly effectively supports the driving shaft and the driven shaft, so that high stability is ensured in the operation process of the double-screw pump.

Preferably, a conveying chamber for accommodating the spiral sleeve is arranged in the pump body, one end, far away from the gear box, of the conveying chamber is connected with an inlet flow channel in a conduction mode, an outlet flow channel which is communicated with the other end of the conveying chamber is arranged on the pump body, and the axis of the outlet flow channel is located on a symmetrical plane of the conveying chamber along the width direction of the conveying chamber. The double-screw pump is mainly used for transmitting media with high viscosity, the axis of the outlet flow channel is arranged on a symmetrical plane of the conveying chamber along the width direction of the conveying chamber, and when the media are transmitted to the outlet flow channel from the inlet flow channel through the driving and driven shafts, the overall disturbance of the media is small.

Preferably, the screw sleeve comprises a main shaft screw sleeve sleeved on the circumferential surface of the driving shaft and a driven shaft screw sleeve sleeved on the circumferential surface of the driven shaft, a spiral first tooth is arranged on the main shaft screw sleeve, a spiral second tooth is arranged on the driven shaft screw sleeve, and the first tooth and the second tooth are meshed with each other and have opposite spiral directions. The purpose of the technical scheme is to ensure that a sealed conveying space can be formed between the first tooth and the second tooth and the inner wall surface of the conveying chamber in the operation process of the main shaft screw sleeve and the driven shaft screw sleeve, so that the normal operation of the single-suction double-screw pump is ensured.

Preferably, the transmission member comprises a first gear and a second gear, the first gear is sleeved on the circumferential surface of the driving shaft away from the pump body, the second gear is fixedly connected with one end of the driven shaft away from the pump body through a pressing plate, the first gear and the second gear are meshed with each other, and the transmission ratio of the first gear to the second gear is 1. The transmission ratio of the first gear and the second gear is 1, and the purpose is to ensure the synchronous rotation of the rotating shaft and the driven shaft and avoid the locking of the main shaft rotating sleeve and the driven shaft spiral sleeve caused by the asynchronous rotation of the driving shaft and the driven shaft.

Preferably, one end of the bearing seat, which is close to the pump body, is provided with a sealing chamber for accommodating a mechanical sealing assembly, the bearing seat is connected with the pump body through a flange, and then the sealing chamber is communicated with the conveying chamber, the mechanical sealing assembly comprises a first sealing element and a second sealing element, the first sealing element is sleeved on the circumferential surface of the driving shaft, and the second sealing element is sleeved on the circumferential surface of the driven shaft. The utility model discloses arrange first sealing member and second sealing member respectively on driving shaft and driven shaft, first sealing member and second sealing member cooperate the back to constitute the third of the pump body and bearing frame sealed, have effectively promoted the sealing performance of screw pump.

Preferably, the bearing frame is including being located the bearing frame body between seal chamber and the gear box, is equipped with two mounting holes along its radial interval arrangement on the bearing frame body, and two mounting holes that are used for holding driving shaft and driven shaft respectively link up the bearing frame body along the direction of the pump body to gear box, and the one end that the mounting hole is close to the pump body is equipped with first mounting groove, and the one end that the pump body was kept away from to the mounting hole is equipped with the second mounting groove, and first mounting groove and second mounting groove all arrange with the mounting hole is coaxial. The driving shaft and the driven shaft penetrate out of the two mounting holes respectively, the first mounting groove and the second mounting groove are arranged at two ends of the mounting holes respectively, and the first mounting groove and the second mounting groove are used for mounting a bearing assembly.

Preferably, the bearing assembly comprises a cylindrical roller bearing, a single-row cylindrical roller bearing and a double-row angular contact ball bearing, a first framework seal is arranged at one end, close to the mechanical seal assembly, of the cylindrical roller bearing arranged in the first mounting groove, the single-row cylindrical roller bearing and the double-row angular contact ball bearing are arranged in the second mounting groove, one end of the single-row cylindrical roller bearing is attached to the groove bottom of the second mounting groove, and a bearing gland is arranged at one end, far away from the single-row cylindrical roller bearing, of the double-row angular contact ball bearing. Single-row cylindrical roller bearing only carries out radial support to the driving and driven axle, and double-row angular contact ball bearing carries out radial support to the driving and driven axle and implements the axial spacingly simultaneously, and traditional screw pump uses two or four bearings, the utility model discloses in use three group six bearings altogether, the stationarity of driving and driven axle operation in-process is higher, and first skeleton is sealed to carry out the axial spacingly to cylindrical roller bearing, and bearing gland carries out the axial spacingly to single-row cylindrical roller bearing and double-row angular contact ball bearing.

Preferably, the circumferential surface of the driving shaft is sleeved with a first shaft sleeve, the circumferential surface of the driven shaft is sleeved with a second shaft sleeve, two ends of the first shaft sleeve are respectively abutted against the cylindrical roller bearing and the single-row cylindrical roller bearing, and two ends of the second shaft sleeve are respectively abutted against the cylindrical roller bearing and the single-row cylindrical roller bearing. The cylinder roller bearing keeps away from the step face that first skeleton seal's one end constitutes through first mounting groove and mounting hole and carries out the axial spacing, and the one end that single-row cylinder roller bearing kept away from the bearing gland carries out the axial spacing through the step face that second mounting groove and mounting hole constitute, reduces the wearing and tearing of principal and subordinate's moving axis simultaneously for promoting spacing intensity, the utility model discloses the cover is equipped with first axle sleeve on the global of well driving shaft, and the cover is equipped with the second axle sleeve on the global of driven shaft.

Preferably, a pump body support is arranged on the peripheral surface of the pump body, an inlet flange is arranged at one end, away from the pump body, of the inlet channel, a suction inlet is formed in the inlet flange, an outlet flange is arranged at one end, away from the pump body, of the outlet channel, and a discharge outlet is formed in the outlet flange.

Preferably, one end of the first gear, which is far away from the pump body, is provided with a pressing block type locking nut for limiting the first gear, and a second framework seal is arranged between the driving shaft and the gear box. The pressing block type locking nut is used for limiting the first gear, preventing the first gear from moving along the length direction of the driving shaft to cause failure of a transmission component, lubricating oil needs to be filled in the gear box, and a second framework seal is arranged between the driving shaft and the gear box for preventing the lubricating oil from leaking out of a gap between the driving shaft and the gear box.

To sum up, the utility model discloses following beneficial effect has: (1) the mechanical sealing assembly effectively seals the pump cavity, so that the double-screw pump can work for a long time without leakage under the working condition of toxic and harmful high-risk media; (2) the bearing assembly effectively supports the driving shaft and the driven shaft, and guarantees high stability of the twin-screw pump in the operation process.

Drawings

Fig. 1 is a front view of the whole of the present invention.

Fig. 2 is a top view corresponding to fig. 1.

Fig. 3 is a left side view corresponding to fig. 1.

Fig. 4 is a different labeled view of the same view as fig. 2.

In the figure:

the pump body 1, the bearing seat 2, the gear box 3, the driving shaft 4, the driven shaft 5, the screw sleeve 6, the main shaft screw sleeve 61, the driven shaft screw sleeve 62, the mechanical seal assembly 7, the first seal 71, the second seal 72, the bearing assembly 8, the cylindrical roller bearing 81, the single-row cylindrical roller bearing 82, the double-row angular contact ball bearing 83, the transmission component 9, the first gear 91, the second gear 92, the conveying chamber 10, the inlet flow passage 11, the outlet flow passage 12, the pressure plate 13, the seal chamber 14, the bearing seat body 15, the mounting hole 16, the first mounting groove 17, the second mounting groove 18, the first skeleton seal 19, the bearing gland 20, the first shaft sleeve 21, the second shaft sleeve 22, the pump body support 23, the inlet flange 24, the second skeleton seal 25 and the pressure block type locking nut 26.

Detailed Description

Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the drawings are exemplary only for the purpose of explaining the present invention, and should not be construed as limiting the present invention.

In the description of the present invention, it is to be understood that the terms "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like, indicate orientations or positional relationships based on the orientations or positional relationships illustrated in the drawings, and are used merely for convenience of description and for simplicity of description, and do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore, should not be construed as limiting the present invention.

In the description of the present invention, it is to be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present invention can be understood in specific cases to those skilled in the art.

Example (b):

as shown in fig. 1 to 4, a single-suction double-screw pump comprises a pump body 1 and a bearing seat 2 arranged at one end of the pump body, wherein a gear box 3 is arranged at one end of the bearing seat far away from the pump body, a driving shaft 4 and a driven shaft 5 which are arranged in parallel at intervals are arranged in the pump body, one end of the driving shaft far away from the pump body protrudes out of the end surface of the gear box far away from the pump body, spiral sleeves 6 which are mutually matched and positioned in the pump body are arranged on the driving shaft and the driven shaft, a mechanical seal assembly 7 is arranged between the pump body and the bearing seat, the driving shaft and the driven shaft are arranged on the bearing seat; a conveying chamber 10 for accommodating a spiral sleeve is arranged in the pump body, one end of the conveying chamber, which is far away from the gear box, is connected with an inlet flow channel 11 in a conduction manner, an outlet flow channel 12 which is communicated with the other end of the conveying chamber is arranged on the pump body, and the axis of the outlet flow channel is positioned on a symmetrical plane of the conveying chamber along the width direction of the conveying chamber; the spiral sleeve comprises a main shaft spiral sleeve 61 sleeved on the circumferential surface of the driving shaft and a driven shaft spiral sleeve 62 sleeved on the circumferential surface of the driven shaft, a spiral first tooth is arranged on the main shaft spiral sleeve, a spiral second tooth is arranged on the driven shaft spiral sleeve, and the first tooth and the second tooth are meshed with each other and have opposite spiral directions; the transmission component comprises a first gear 91 and a second gear 92, the first gear is sleeved on the circumferential surface of the driving shaft far away from the pump body, the second gear is fixedly connected with one end of the driven shaft far away from the pump body through a pressing plate 13, the first gear and the second gear are mutually meshed, and the transmission ratio of the first gear to the second gear is 1; a sealing chamber 14 for accommodating a mechanical sealing assembly is arranged at one end, close to the pump body, of the bearing seat, the bearing seat is connected with the pump body through a flange, then the sealing chamber is communicated with the conveying chamber, the mechanical sealing assembly comprises a first sealing element 71 and a second sealing element 72, the first sealing element is sleeved on the circumferential surface of the driving shaft, and the second sealing element is sleeved on the circumferential surface of the driven shaft; the bearing seat comprises a bearing seat body 15 positioned between the sealing chamber and the gear box, two mounting holes 16 which are arranged at intervals along the radial direction of the bearing seat body are arranged on the bearing seat body, the two mounting holes which are respectively used for accommodating the driving shaft and the driven shaft penetrate through the bearing seat body along the direction from the pump body to the gear box, one end, close to the pump body, of each mounting hole is provided with a first mounting groove 17, one end, far away from the pump body, of each mounting hole is provided with a second mounting groove 18, and the first mounting groove and the second mounting groove are; the bearing assembly comprises a cylindrical roller bearing 81, a single-row cylindrical roller bearing 82 and a double-row angular contact ball bearing 83, wherein a first framework seal 19 is arranged at one end, close to the mechanical seal assembly, of the cylindrical roller bearing arranged in a first mounting groove, the single-row cylindrical roller bearing and the double-row angular contact ball bearing are arranged in a second mounting groove, one end of the single-row cylindrical roller bearing is attached to the groove bottom of the second mounting groove, and a bearing gland 20 is arranged at one end, far away from the single-row cylindrical roller bearing, of the double-row angular contact ball bearing; the peripheral surface of the driving shaft is sleeved with a first shaft sleeve 21, the peripheral surface of the driven shaft is sleeved with a second shaft sleeve 22, two ends of the first shaft sleeve are respectively abutted with the cylindrical roller bearings and the single-row cylindrical roller bearings, and two ends of the second shaft sleeve are respectively abutted with the cylindrical roller bearings and the single-row cylindrical roller bearings; a pump body bracket 23 is arranged on the peripheral surface of the pump body, an inlet flange 24 is arranged at one end of the inlet channel far away from the pump body, a suction inlet is arranged on the inlet flange, an outlet flange is arranged at one end of the outlet channel far away from the pump body, and a discharge outlet is arranged on the outlet flange; one end of the first gear, which is far away from the pump body, is provided with a pressing block type locking nut 26 for limiting the first gear, and a second framework seal 25 is arranged between the driving shaft and the gear box.

As shown in the position relation of figure 1, a pump body, a bearing seat and a gear box are arranged in sequence from left to right, as can be seen by combining figure 2, the section of the pump body is approximately rectangular, a conveying chamber which runs through and extends from left to right is arranged in the pump body, an inlet flow passage is arranged at the left side of the pump body, a driving shaft and a driven shaft are arranged in the conveying chamber, as shown in the position of the figure, the driving shaft is positioned at the lower side of the driven shaft, the driving shaft and the driven shaft are arranged in parallel from left to right, a main shaft spiral sleeve is sleeved on the circumferential surface of the driving shaft close to the left end of the driving shaft, a driven shaft spiral sleeve is sleeved on the circumferential surface of the driven shaft close to the left end of the driven shaft, threads of the main shaft spiral sleeve and the driven shaft spiral sleeve are opposite and mutually meshed, the main shaft spiral sleeve and the driven, the right half part of the bearing seat is a bearing seat body, a flange extending out of the left end of the bearing seat body is connected with the pump body to form a sealing chamber, the bearing seat body is provided with two mounting holes which are communicated from left to right, the two mounting holes are arranged at intervals from top to bottom, a driving shaft and a driven shaft respectively penetrate through one mounting hole, a second sealing element is arranged on the peripheral surface of the part of the driven shaft positioned in the sealing chamber, a first sealing element is arranged on the peripheral surface of the part of the driving shaft positioned in the sealing chamber, the parts of the first sealing element and the second sealing element, which are abutted to each other between the driving shaft and the driven shaft, are matched to form a third sealing element, when the double-screw pump conveys toxic and harmful high-risk media, the pressure of lubricating oil in the mechanical sealing assembly is about 0.2MPa higher than the pressure of the media in the conveying chamber, when the mechanical sealing assembly is damaged, lubricating oil in the mechanical sealing assembly can flow backwards into the conveying chamber under the action of pressure difference, so that leakage of harmful media is effectively avoided, the pump body and the bearing seat are connected in a matched mode through flanges, an oil-resistant and temperature-resistant asbestos plate or a rubber pad with the thickness of 1mm is arranged between sealing surfaces in the connection process, the sealing strength between the pump body and the bearing seat is improved while the pump body and the bearing seat are ensured to be stably connected, a first mounting groove coaxial with the mounting hole is arranged at the left end of the mounting hole, a second mounting groove coaxial with the mounting hole is arranged at the right end of the mounting hole, a cylindrical roller bearing is arranged in the first mounting groove, a first sealing framework for axially limiting the cylindrical roller bearing is arranged at the left end of the cylindrical roller bearing, the depth of the second mounting groove is larger than that of the first mounting groove, a single-row cylindrical roller bearing and a double-row angular contact ball bearing are arranged in the second mounting groove from, the bearing cover is connected with the right end of the bearing seat body through a bolt, the right end of the driven shaft protrudes out of the bearing cover, a second gear is sleeved on the circumferential surface of the driven shaft, a sinking groove is formed in the right end surface of the second gear, a pressing plate in the sinking groove is matched with the bolt to fix the second gear and the right end of the driven shaft, the gear box is connected with the right end of the bearing seat body through the bolt, a mounting hole coaxial with the driving shaft is formed in the right end cover of the gear box, the driving shaft can penetrate out of the gear box through the mounting hole and then is connected with an output shaft of a motor through a coupler, a first gear is sleeved on the circumferential surface of the driving shaft, a pressing block type locking nut for limiting the first gear is arranged at the right end of the first gear, the first gear and the second gear are respectively in interference fit with the driving shaft and the driven shaft, the first gear and the second gear are, a second sealing framework is arranged between the driving shaft and the gear box, and lubricating oil needs to be filled in the gear box.

Claims (9)

1. A single-suction double-screw pump is characterized by comprising a pump body and a bearing seat arranged at one end of the pump body, wherein a gear box is arranged at one end, far away from the pump body, of the bearing seat, a driving shaft and a driven shaft are arranged in the pump body in parallel at intervals, one end, far away from the pump body, of the driving shaft protrudes out of the end face, far away from the pump body, of the gear box, spiral sleeves which are matched with each other and are positioned in the pump body are arranged on the driving shaft and the driven shaft, a mechanical sealing assembly is arranged between the pump body and the bearing seat, the driving shaft and the driven shaft are arranged on the bearing seat, the single-row cylindrical roller bearing and the double-row angular contact ball bearing are arranged, the transmission component comprises a first gear and a second gear, the first gear is sleeved on the circumferential surface of the driving shaft far away from the pump body, and one end of the first gear far away from the pump body is provided with a pressing block type locking nut for limiting the first gear.

2. A single-suction twin-screw pump according to claim 1, wherein the pump body has a delivery chamber for accommodating the screw casing, an inlet flow passage is connected to one end of the delivery chamber remote from the gear box, an outlet flow passage is connected to the other end of the delivery chamber, and the axis of the outlet flow passage is located on a symmetrical plane of the delivery chamber along the width direction thereof.

3. The single-suction double-screw pump as claimed in claim 1, wherein the screw sleeve comprises a main shaft screw sleeve sleeved on the peripheral surface of the driving shaft and a driven shaft screw sleeve sleeved on the peripheral surface of the driven shaft, the main shaft screw sleeve is provided with a first helical tooth, the driven shaft screw sleeve is provided with a second helical tooth, and the first tooth and the second tooth are meshed with each other and have opposite helical directions.

4. A single-suction double-screw pump according to claim 1, characterized in that the second gear is fixedly connected with one end of the driven shaft far away from the pump body through a pressure plate, the first gear and the second gear are meshed with each other, and the transmission ratio of the first gear and the second gear is 1.

5. The single-suction double-screw pump according to claim 2, wherein a sealing chamber for accommodating a mechanical sealing assembly is arranged at one end of the bearing block close to the pump body, the sealing chamber is communicated with the conveying chamber after the bearing block and the pump body are connected through a flange, the mechanical sealing assembly comprises a first sealing element and a second sealing element, the first sealing element is sleeved on the circumferential surface of the driving shaft, and the second sealing element is sleeved on the circumferential surface of the driven shaft.

6. The single-suction double-screw pump according to claim 5, wherein the bearing seat comprises a bearing seat body located between the seal chamber and the gear box, the bearing seat body is provided with two mounting holes spaced along a radial direction of the bearing seat body, the two mounting holes for respectively accommodating the driving shaft and the driven shaft penetrate through the bearing seat body along a direction from the pump body to the gear box, one end of each mounting hole close to the pump body is provided with a first mounting groove, one end of each mounting hole far away from the pump body is provided with a second mounting groove, and the first mounting groove and the second mounting groove are both arranged coaxially with the mounting holes.

7. The single-suction double-screw pump according to claim 6, wherein the end of the cylindrical roller bearing arranged in the first mounting groove close to the mechanical seal assembly is provided with a first skeleton seal, the single-row cylindrical roller bearing and the double-row angular contact ball bearing are arranged in the second mounting groove, one end of the single-row cylindrical roller bearing is attached to the groove bottom of the second mounting groove, and the end of the double-row angular contact ball bearing far away from the single-row cylindrical roller bearing is provided with a bearing gland.

8. The single-suction double-screw pump as claimed in claim 7, wherein a first shaft sleeve is sleeved on the circumferential surface of the driving shaft, a second shaft sleeve is sleeved on the circumferential surface of the driven shaft, two ends of the first shaft sleeve are respectively abutted against the cylindrical roller bearings and the single-row cylindrical roller bearings, and two ends of the second shaft sleeve are respectively abutted against the cylindrical roller bearings and the single-row cylindrical roller bearings.

9. A single-suction double-screw pump according to claim 1, 2, 3 or 4, characterized in that the pump body support is provided on the outer peripheral surface of the pump body, the inlet flange is provided on the end of the inlet flow channel away from the pump body, the inlet flange is provided with the suction inlet, the outlet flange is provided on the end of the outlet flow channel away from the pump body, and the outlet flange is provided with the discharge outlet.

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