CN210859182U - Positive displacement gear vehicle-mounted unloading pump - Google Patents

Abstract

The utility model discloses an on-vehicle pump of unloading of positive displacement gear is by the gear pump, by gear pump, motor, base, shaft coupling and protection casing dress as an organic whole, and the structure is small and exquisite, and the transportation is convenient, can utilize the narrow and small space of jar case, the direct mount is at the border of jar case. The gear pump is connected with the motor with the mode that directly links, easy operation, and is efficient, and the gear train includes the master gear and locates the idler gear of its both sides, and the impact load of the high pressure that effective balance gear meshing compressed liquid produced is to gear and axle reduces the change of liquid speed and direction, reduces the impact to subassembly in the pump, solves the big problem of gear pump flow pulsation, improves liquid transport's stability, and the noise reduction increases the life of gear train. In addition, the gear pump adopts mechanical seal and skeleton oil blanket to form double-deck sealed leakage prevention, and the structure is firm, safe and reliable.

Description

Positive displacement gear vehicle-mounted unloading pump

Technical Field

The utility model belongs to the cryogenic liquids field of transporting, concretely relates to on-vehicle pump of unloading of positive displacement gear.

Background

The low-temperature liquid transfer is commonly used in a low-temperature centrifugal pump, the working principle of the low-temperature centrifugal pump is that a rotating impeller applies work to liquid, the mechanical energy of a prime motor is transferred to the liquid, when the pump is filled with the liquid to work, the liquid generates centrifugal force under the action of the impeller due to the high-speed rotation of the impeller, the pressure energy and the speed energy are both increased in the process of driving the liquid to flow from an inlet of the impeller to an outlet, and then the speed energy is further converted into the pressure energy in a diffusion chamber and then output. Generally, the low-temperature centrifugal pump is placed on the ground instead of a vehicle, and the low-temperature centrifugal pump is required to be moved to the periphery of a low-temperature tank box when in use, and then the low-temperature centrifugal pump and the low-temperature tank box are connected through a hose, the low-temperature centrifugal pump and a storage tank are connected through complex connection operation, a plurality of pipelines are needed, and cavitation is easily caused.

In order to avoid the problems of large volume, complex operation and the like of the centrifugal pump in practical application, the centrifugal pump is replaced by a gear pump. The gear pump is a rotary pump which transfers or pressurizes liquid by means of the change and movement of the working volume formed between a pump cylinder and a meshing gear, and generally comprises two gears, a pump body and front and rear covers to form two closed spaces. The gear pump has the characteristics of simple structure, small volume, low price, strong self-suction force, large rotating speed range, convenient maintenance and the like, but has the defects of unbalanced radial force, large leakage, large noise, low efficiency and the like. For example, application number 201420566317.7's chinese utility model patent discloses a gear pump, prevents through setting up skeleton oil blanket and O type circle to leak, makes the gear pump still can keep higher volumetric efficiency under very high pressure through wear-resisting curb plate, and this utility model improves volumetric efficiency and mechanical efficiency and moves simply when reducing the volume, nevertheless does not consider radial atress unbalance, big noise and the big scheduling problem of flow pulsation, and long-term use can lead to gear pump bearing wearing and tearing serious, influences the life-span.

SUMMERY OF THE UTILITY MODEL

In order to solve the problem, the utility model provides an on-vehicle pump of unloading of positive displacement gear mainly is the tank case and unloads liquid and the design, also can fill dress at the gas cylinder, use on the conveying in batches, has characteristics such as small, with low costs, efficient, the noise is low, the transmission is stable, the leakproofness is strong, the maintenance cycle length.

In order to achieve the above purpose, the utility model adopts the following specific technical scheme:

a vehicle-mounted unloading pump with positive displacement gears comprises a base, wherein a gear pump and a driving piece are fixedly mounted on the base, and the driving piece is connected with a main shaft of the gear pump through a connecting piece so as to drive the main shaft to rotate; the gear pump comprises a main shell, a gear end cover, a main shaft end cover and a transmission assembly, wherein two ends of the main shell are fixedly connected with the gear end cover and the main shaft end cover respectively, the bearing end cover seals the main shaft end cover and enables a main shaft to extend out, the gear end cover is provided with a liquid inlet, a liquid outlet is formed in the surface of the main shell, the transmission assembly comprises a main shaft and idle gear shafts arranged on two sides of the main shaft, two main gears are arranged on the main shaft close to one side of the gear end cover at intervals, and idle gears meshed with the main gears are arranged on the.

Preferably, be equipped with seal assembly in the main shaft end cover, seal assembly includes skeleton oil blanket and mechanical seal, mechanical seal and skeleton oil blanket are passed in proper order to the main shaft, the circlip is installed on the skeleton oil blanket right side for the axle. The mode that adopts skeleton oil blanket and mechanical seal to combine effectively prevents to leak, and the other installation of skeleton oil blanket is with circlip and is prevented the axial float of skeleton oil blanket.

Preferably, the main shaft and the idle gear shaft are provided with sliding bearings, so that friction loss and surface wear are reduced.

Preferably, the sliding bearing is a carbon-graphite bearing, and the carbon-graphite bearing with wear resistance and self-lubricating effect is adopted, so that the defects of large volume and heavy weight of a box body generated by the traditional oil lubricating mode are overcome.

Preferably, a protective cover fixed on the base is arranged above the connecting piece.

Preferably, the driving member is a motor, and the connecting member is a coupler.

Preferably, the two sides of the base are provided with fixing parts, and through holes are formed in the surfaces of the fixing parts, so that the base and other parts can be conveniently installed and fixed.

The utility model discloses on-vehicle pump of unloading of positive displacement gear comprises gear pump, motor, base, shaft coupling and protection casing, and the gear pump directly links the motor through the shaft coupling, and the protection casing is located the shaft coupling top and is prevented that the connecting axle from being destroyed by external force, and gear pump, motor, protection casing are fixed in the base and become a whole rather than becoming, can use pedestal mounting at the tank rim of a case to the mode that directly links is connected with the motor, compares parts such as traditional cryopump reduced transmission case and big or small band pulley, and is small, easy operation. Conventional gear pump is by two gears, two enclosure spaces are constituteed with the front and back lid to the pump body, and the rotation meshing through the gear realizes liquid transport (the background art has the detailing), the utility model discloses be equipped with two gear trains, every gear train includes a master gear and locates the idler gear of its both sides, is different from traditional two cavity structures, and four cavities are divided into with the pump body to the design of two idler gears, and wherein the feed liquor cavity communicates with each other rather than diagonal cavity, for the low-pressure area, and two remaining diagonal cavity are high pressure district, and liquid is carried to its adjacent high pressure cavity by the gear drive by the low pressure cavity, then is discharged by the liquid outlet that sets up on the high pressure cavity. The design of three gears of the gear set has remarkable advantages: on the one hand, the design in two upper and lower chambeies of idler gear is the impact load of the high pressure counter gear and the axle that produces for balanced gear meshing compression liquid, and two traditional gear designs are because only a high pressure chamber and a low pressure chamber for carry the gear of liquid and axle both sides atress unbalanced all the time, if long-term operation, gear and axle can be because radial unbalanced stress takes place serious wearing and tearing, and the utility model discloses by two idler gears simultaneous syntropy operation under the master gear drives, and two upper and lower idler gears are opposite with the meshing direction of master gear, effective balanced gear group radial atress. On the other hand, the speed of liquid entering the gear backlash is closely matched with the speed of the gear set so as to reduce the change of the speed and the direction of the liquid as much as possible, thereby reducing the pressure in the pump to the minimum, reducing the impact on components in the pump, solving the problem of large flow pulsation of the gear pump, improving the stability of liquid delivery, reducing the noise and prolonging the service life of the gear set. In addition, the arrangement of the two gear sets can accelerate liquid conveying and improve efficiency.

The utility model discloses following beneficial effect has:

on-vehicle pump of unloading of positive displacement gear is as an organic whole by gear pump, motor, base, shaft coupling and protection casing dress, and the structure is small and exquisite, simple to operate, and the gear pump is connected with the motor with the mode that directly links, simplifies the structure, easy operation. The design of one main gear and two idle gears in the gear set effectively balances the radial stress of the gears, reduces the impact of liquid on components in the pump, solves the problem of large flow pulsation of the gear pump, and has stable liquid delivery and low noise, so that the gear pump is not easy to wear and has long maintenance period.

The gear pump adopts mechanical seal spare and skeleton oil blanket to form double-deck sealed, and the leakproofness is strong, can effectively prevent the leakage of liquid and lubricating oil, makes the gear pump structure more firm simultaneously, safe and reliable. The carbon-graphite bearing with wear resistance and self-lubricating effect is adopted, so that the defects of large volume and heavy weight of the box body generated by the traditional oil lubricating mode are overcome.

Drawings

FIG. 1: the utility model discloses the main view section-bar of gear pump.

FIG. 2: the utility model discloses half section view is looked to the left side of gear pump.

In the figure: 1-main shell, 2-gear end cover, 3-main shaft end cover, 4-bearing end cover, 5-main shaft, 6-idle gear shaft, 7-main gear, 8-idle gear, 9-framework oil seal, 10-mechanical seal, 11-elastic retainer ring for shaft, 12-sliding bearing, 13-liquid inlet flange and 14-liquid outlet flange.

Detailed Description

The present invention will be further described with reference to the accompanying drawings.

Example 1

The utility model provides an on-vehicle pump of unloading of positive displacement gear, includes the base, fixed mounting has gear pump and motor on the base, thereby the output shaft of motor passes through the shaft coupling and is connected 5 rotations of drive main shaft with the main shaft of gear pump, and the junction top is equipped with the protection casing that is fixed in the base, and the base both sides are equipped with the fixed part, the through-hole has been seted up on the surface of fixed part, is convenient for will unload pump direct mount at the border of jar case.

As shown in fig. 1, the gear pump includes a main housing 1, a gear end cover 2, a spindle end cover 3 and a transmission assembly, wherein two ends of the main housing 1 are respectively fixedly connected with the gear end cover 2 and the spindle end cover 3 through bolts, and a bearing end cover 4 seals the spindle end cover 3 and extends out of a spindle 5. The gear end cover 2 is provided with a liquid inlet, the liquid inlet is provided with a liquid inlet flange 13 fixedly connected through bolts, the surface of the main shell 1 is provided with a liquid outlet, and the liquid inlet is provided with a liquid outlet flange 14 fixedly connected through bolts. The transmission assembly comprises a main shaft 5 and idler gear shafts 6 arranged on two sides of the main shaft, two main gears 7 are arranged on one side, close to the gear end cover 2, of the main shaft 5 at intervals, idler gears 8 meshed with the main gears 7 are arranged on the idler gear shafts 6 on the two sides, sliding bearings 12 are arranged on the main shaft 5 and the idler gear shafts 6, and the sliding bearings 12 are carbon-graphite bearings. Be equipped with seal assembly in the main shaft end cover 3, seal assembly includes skeleton oil blanket 9 and mechanical seal 10, main shaft 5 passes mechanical seal 10 and skeleton oil blanket 9 in proper order, axle circlip 11 is installed on skeleton oil blanket 9 right side.

The gear pump of the utility model is internally divided into four chambers, and seen from the direction of figure 2, the upper left chamber and the lower right chamber of the pump are communicated with each other and are a low pressure region, and the upper right chamber and the lower left chamber are communicated with each other and are a high pressure region; when the pump operates, liquid firstly enters the upper left chamber of the pump from the liquid inlet and directly enters the lower right chamber of the pump, the motor drives the spindle 5 to rotate anticlockwise, the main gear 7 drives the idle gears 8 on the two sides to rotate clockwise, liquid in the low-pressure area is guided to the space between the gear teeth and transferred to the high-pressure area, namely the liquid in the upper left chamber is transferred to the upper right chamber, the liquid in the lower right chamber is transferred to the lower left chamber, and then the liquid is discharged from the liquid outlet arranged on the upper right chamber.

This detailed description is to be construed as illustrative only and not limiting, and any changes that may be made by a person skilled in the art after reading the present disclosure are intended to be protected by the patent laws within the scope of the appended claims.

Claims (7)

1. The utility model provides an on-vehicle pump of unloading of positive displacement gear, includes the base, its characterized in that: the base is fixedly provided with a gear pump and a driving piece, and the driving piece is connected with a main shaft (5) of the gear pump through a connecting piece so as to drive the main shaft (5) to rotate; the gear pump comprises a main shell (1), a gear end cover (2), a main shaft end cover (3) and a transmission assembly, wherein the two ends of the main shell (1) are fixedly connected with the gear end cover (2) and the main shaft end cover (3) respectively, the bearing end cover (4) seals the main shaft end cover (3) and enables the main shaft (5) to extend out, the gear end cover (2) is provided with a liquid inlet, the surface of the main shell (1) is provided with a liquid outlet, the transmission assembly comprises the main shaft (5) and idler gear shafts (6) arranged on the two sides of the main shaft (5), two main gears (7) are arranged on the main shaft (5) close to one side of the gear end cover (2) at intervals, and idler gears (8) meshed with the main gears (7) are.

2. The positive displacement gear truck unloading pump of claim 1, wherein: be equipped with seal assembly in main shaft end cover (3), seal assembly includes skeleton oil blanket (9) and mechanical seal (10), mechanical seal (10) and skeleton oil blanket (9) are passed in proper order in main shaft (5), circlip (11) are installed on skeleton oil blanket (9) right side for the axle.

3. The positive displacement gear truck unloading pump of claim 1, wherein: the main shaft (5) and the idle gear shaft (6) are both provided with sliding bearings (12).

4. The positive displacement gear truck unloading pump of claim 3, wherein: the sliding bearing (12) is a carbon-graphite bearing.

5. The positive displacement gear truck unloading pump of claim 1, wherein: and a protective cover fixed on the base is arranged above the connecting piece.

6. The positive displacement gear truck unloading pump of claim 1, wherein: the driving piece is a motor, and the connecting piece is a coupler.

7. The positive displacement gear truck unloading pump of claim 1, wherein: the base both sides are equipped with the fixed part, the through-hole has been seted up on the surface of fixed part.

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