CN216842192U - Single-rotor displacement pump - Google Patents

Abstract

The utility model discloses a single rotor positive displacement pump, including the pump body, rotor, preceding pump cover, back pump cover, gleitbretter and compensating spring, the rotor is the column single rotor, and is equipped with a rotor profile face, and the contour line of rotor profile face is standard ellipse or approximate ellipse, and the pump body is equipped with the pump body hole of round hole form, and pump body conch wall radially is equipped with the sliding vane groove, pump inlet and pump export, and pump inlet and pump export are arranged respectively in the both sides in sliding vane groove. The rotor is arranged in the inner hole of the pump body, and the rotor and the inner hole of the pump body are coaxial. The sliding sheet is arranged in the sliding sheet groove, a spring seat is arranged above the sliding sheet groove, and the end part of the sliding sheet is in sliding fit with the rotor contour surface under the thrust action of the compensation spring. A pump cavity in the shape of 2 crescent teeth is formed between the contour surface of the rotor and the inner hole of the pump body. The sliding vane divides the pump cavity into a suction cavity and a pressing cavity, the suction cavity is communicated with the pump inlet, and the pressing cavity is communicated with the pump outlet. Simple structure, short manufacturing period, low manufacturing cost, high reliability and long service life.

Description

Single-rotor displacement pump

Technical Field

The utility model relates to a positive displacement pump technical field especially relates to a single rotor positive displacement pump.

Background

The positive displacement pump comprises a gear pump, a roots pump, a rotary vane pump, a liquid ring pump, a single-screw pump and the like, has the characteristics of high pressure, convenient use and the like, and is widely applied to the fields of hydraulic pressure, sewage treatment, vacuum, chemical industry and the like.

However, prior art positive displacement pumps suffer from a number of drawbacks. The gear pump and the roots pump have high processing precision and need high-precision processing equipment, so the product cost is high, the manufacturing period is long, and simultaneously, because the precision of the positive displacement pumps is high, the probability of the pump failure is also high, the service life is short and the maintenance cost is high. The Roots pump and the single-screw pump are difficult to design, ideal rotor profiles are not easy to obtain, and poor rotor profiles can influence the running stability of the rotor and the pulsation of flow. In addition, the prior art positive displacement pumps mostly require a die opening during the manufacturing process, which is another factor of cost increase.

Disclosure of Invention

In order to solve the above problem, the utility model provides a single-rotor positive displacement pump can fine solve prior art's positive displacement pump's machining precision height, manufacturing cycle length, cost are higher and life-span a great deal of defects such as lower.

In order to realize the purpose, the utility model discloses the technical scheme who adopts is:

a single-rotor displacement pump comprises a pump body, a rotor, a front pump cover, a rear pump cover, a slip sheet and a compensation spring, wherein the rotor is a cylindrical single rotor and is provided with a rotor contour surface, the contour line of the rotor contour surface is a standard ellipse or an approximate ellipse, the rotation axis of the rotor is the geometric central axis of the cylindrical body, and the rotor is provided with a rotor shaft hole on the rotation axis; the pump body is provided with a circular-hole-shaped pump body inner hole, the wall of the pump body is radially provided with a slide sheet groove, a pump inlet and a pump outlet, and the pump inlet and the pump outlet are respectively arranged on two sides of the slide sheet groove; the rotor is arranged in the inner hole of the pump body, the rotation axis of the rotor is superposed with the axis of the inner hole of the pump body, and the elliptical long axis of the contour line of the rotor is equal to the nominal size of the diameter of the inner hole of the pump body; the sliding sheet is arranged in the sliding sheet groove, 4 surfaces of the sliding sheet are respectively attached to 4 surfaces of the sliding sheet groove, so that the sealing and guiding effects are achieved, the spring seat is arranged above the sliding sheet groove, and the end part of the sliding sheet extends out of the inner hole of the pump body along the sliding sheet groove under the thrust action of the compensation spring and is in sliding fit with the profile surface of the rotor; a pump cavity in a shape of 2 crescent teeth is formed between the contour surface of the rotor and the inner hole of the pump body; the sliding sheet divides one pump cavity into a suction cavity and a pressing cavity, the suction cavity is communicated with the pump inlet, and the pressing cavity is communicated with the pump outlet;

the two sides of the pump body are respectively connected with the front pump cover and the rear pump cover, the front pump cover and the rear pump cover are respectively provided with a bearing cavity on the axis thereof, a bearing part is arranged in the bearing cavity, and a certain running clearance is kept between the end surfaces of the front pump cover and the rear pump cover and the two end surfaces of the rotor; the motor base and the motor are sequentially connected to the outer side of the rear pump cover, a pump shaft is arranged in the rotor shaft hole and connected with the shaft of the motor, a gland is arranged on one side of a bearing cavity of the rear pump cover, and the gland is connected with the pump shaft through a shaft seal component.

As a further improvement, the gleitbretter is equipped with several spring hole, the axis in spring hole is on a parallel with the compensation direction of gleitbretter, compensation spring is the pressure spring and arranges in the spring hole, compensation spring's one end is fixed in the spring holder.

As a further improvement of the present invention, the bearing component includes a bearing body, a bearing sleeve and a round nut, the bearing component adopts medium self-lubrication, the bearing body is embedded in the inner holes of the front pump cover and the rear pump cover, the bearing sleeve is sleeved on the pump shaft, and one end of the bearing sleeve is locked by the round nut; a disc is arranged at one end of the bearing sleeve, the inner side surface of the disc and one end surface of the bearing body are thrust surfaces, and a pair of thrust surfaces are mutually attached and bear axial thrust from the rotor; the inner hole surface of the bearing body and the outer circle surface of the bearing sleeve are mutually attached to bear the radial force from the rotor.

As a further improvement of the utility model, the rotor has two kinds of operating modes of corotation and reversal, during the reversal the pump entry exchanges with the pump export.

As a further improvement, the single-rotor positive displacement pump does not have a back pressure valve or a safety valve, when overpressure occurs, because the preset elasticity of the compensating spring, the slip sheet and a tiny gap can be generated between the rotor profile surfaces, and the medium can be followed the extrusion cavity to the suction cavity pressure relief, thereby achieving the safety protection effect.

As a further improvement of the utility model, the pump inlet and the pump outlet are both provided with a runner gradually changed from a square opening to a round opening, and the outer end of the runner is the round opening.

As a further improvement of the present invention, the shaft seal component is an oil seal or a mechanical seal.

Compared with the prior art, the beneficial effects of the utility model are that:

1. simple structure, manufacturing cost is lower: the pump body main part is cylindric, and the rotor is the column structure, and the machining precision requires lowly, does not need to make the mould, and the manufacturing cycle is short, therefore manufacturing cost is lower.

2. High reliability and long service life: the structure is simple, the number of parts is small, and the reliability is high, so that the service life is long.

Drawings

The accompanying drawings are included to provide a further understanding of the invention, and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention, and together with the description, do not constitute a limitation of the invention, in which:

fig. 1 is a schematic structural diagram of the present invention.

Fig. 2 is a cross-sectional view at C-C in fig. 1.

Fig. 3 is a partial enlarged view at I in fig. 1.

Fig. 4 is a partial enlarged view of fig. 2 at ii.

Fig. 5 is a sectional view of the pump body of the present invention.

Fig. 6 is a structural view of the rotor of the present invention.

Fig. 7 is a cross-sectional view of the slider of the present invention.

Fig. 8 is a schematic diagram of the operation of the present invention, wherein fig. 8(a), fig. 8(b), fig. 8(c) and fig. 8(d) show the schematic diagrams of the rotor rotating to different positions.

In the figure: 1. the pump comprises a pump body, 2, a rotor, 3, a front pump cover, 4, a rear pump cover, 5, a sliding vane, 6, a compensating spring, 7, a spring seat, 8, a bearing component, 9, a pump shaft, 10, a motor seat, 11, a gland, 12, a shaft seal component, 13, a motor, 101, a pump body inner hole, 102, a pump inlet, 103, a pump outlet, 104, a sliding vane groove, 201, a rotor contour surface, 202, a rotor shaft hole, 300, a pump cavity, 301, a suction cavity, 302, an extrusion cavity, 400, a bearing cavity, 501, a spring hole, 801, a bearing body, 802, a bearing sleeve, 803 and a round nut.

Detailed Description

The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts all belong to the protection scope of the present invention.

In the description of the present invention, it should be noted that the terms "upper", "lower", "left", "right", "inner", "outer", "front", "rear", "both ends", "one end", "the other end", and the like indicate the directions or positional relationships based on the directions or positional relationships shown in the drawings, and are only for convenience of description and simplification of the description, but do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first" and "second" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.

As shown in fig. 1 to 7, the utility model provides a single-rotor displacement pump, including the pump body 1, rotor 2, preceding pump cover 3, back pump cover 4, gleitbretter 5 and compensating spring 6, rotor 2 is the single rotor of column, and is equipped with a rotor profile 201, the profile line of rotor profile 201 is standard ellipse or approximate ellipse, the axis of revolution of rotor 2 is the geometric centre axis of column, rotor 2 is equipped with rotor shaft hole 202 at its axis of revolution, therefore rotor 2 can not be like the single-rotor pump of prior art eccentric rotation, rotor 2 is totally balanced in theory and need not to remove the weight, need not to do the balance test; meanwhile, the cylindrical body of the rotor 2 can be directly obtained into a blank by using a thick steel plate without manufacturing a die, and the rotor profile surface 201 can be formed by adopting a numerical control milling process or a linear cutting process, so that the process is simple, and the manufacturing cost is saved. As shown in fig. 5, the pump body 1 is provided with a pump body inner hole 101 in a circular hole shape, the pump body 1 is provided with a vane groove 104, a pump inlet 102 and a pump outlet 103 in a wall radial direction of the pump body 1, and the pump inlet 102 and the pump outlet 103 are respectively arranged on both sides of the vane groove 104. As shown in fig. 2, the rotor 2 has two modes of operation, forward and reverse, with the pump inlet and pump outlet being interchanged in reverse.

The rotor 2 is arranged in the pump body inner hole 101, and the rotation axis of the rotor 2 is superposed with the axis of the pump body inner hole 101, namely the rotor 2 is concentric with the pump body inner hole 101. The major ellipse axis of the contour of the rotor 2 is equal to the nominal dimension of the diameter of the pump body bore 101, and the most convex part of the rotor contour surface 201 forms a 2-position seal with the pump body bore 101. The sliding sheet 5 is arranged in the sliding sheet groove 104, 4 surfaces of the sliding sheet 5 are respectively attached to 4 surfaces of the sliding sheet groove 104 to play a role in sealing and guiding, and the spring seat 7 is arranged above the sliding sheet groove 104. The sliding vane 5 is provided with a plurality of spring holes 501, the axis of each spring hole 501 is parallel to the compensation direction of the sliding vane 5, the compensation springs 6 are compression springs and are arranged in the spring holes 501, and one ends of the compensation springs 6 are fixed on the spring seats 7. The end of the sliding sheet 5 extends out to the pump body inner hole 101 along the sliding sheet groove 104 under the thrust action of the compensating spring 6, and is in sliding fit with the rotor contour surface 201, and the sliding sheet 5 plays a role in sealing and isolating. A pump cavity 300 in the shape of 2-month teeth is formed between the rotor contour surface 201 and the pump body inner hole 101. The slide plate 5 divides one of the pump chambers 300 into a suction chamber 301 and a discharge chamber 302, the suction chamber 301 communicating with the pump inlet 102, and the discharge chamber 302 communicating with the pump outlet 103. The pump inlet 102 and the pump outlet 103 are respectively provided with a flow channel gradually changed from a square opening to a round opening, and the outer end of the flow channel is a round opening.

The two sides of the pump body 1 are respectively connected with a front pump cover 3 and a rear pump cover 4, and the front pump cover 3 and the pump body 1 can be integrated according to the mechanical process and the size of the pump body. The front pump cover 3 and the rear pump cover 4 are respectively provided with a bearing cavity 400 on the axis, a bearing part 8 is arranged in the bearing cavity 400, and a certain running clearance is kept between the end surfaces of the front pump cover 3 and the rear pump cover 4 and the two end surfaces of the rotor 2. The outer side of the rear pump cover 4 is sequentially connected with a motor base 10 and a motor 13, a pump shaft 9 is arranged in the rotor shaft hole 202, the pump shaft 9 is connected with a shaft of the motor 13, a gland 11 is arranged on one side of a bearing cavity 400 of the rear pump cover 4, and the gland 11 is connected with the pump shaft 9 through a shaft seal component 12. In the present embodiment, the pump head (mainly including the pump body 1, the rotor 2, the front pump cover 3 and the rear pump cover 4) is supported by the motor 13 through the connection motor base 10, which does not exclude that in other embodiments, the pump head is provided with an independent support.

In this embodiment, the bearing component 8 is a sliding bearing, the bearing component 8 includes a bearing body 801, a bearing sleeve 802 and a round nut 803, the bearing component 8 adopts medium self-lubrication, 2 bearing bodies 801 are respectively embedded in the inner holes of the front pump cover 3 and the rear pump cover 4, 2 bearing sleeves 802 are sleeved on the pump shaft, and one end of each bearing sleeve is locked by the round nut 803. One end of the bearing sleeve 802 is provided with a disk, the inner side surface of the disk and one end surface of the bearing body 801 are thrust surfaces, and a pair of thrust surfaces are mutually attached and bear the axial thrust from the rotor 2. The inner bore surface of the bearing body 801 and the outer circumferential surface of the bearing sleeve 802 are bonded to each other, and bear the radial force from the rotor 2. The shaft seal member 12 is an oil seal or a mechanical seal. In other embodiments, the bearing component 8 may also be a rolling bearing, a pair of rolling bearings are respectively disposed in bearing seats on the outer sides of the front pump cover 3 and the rear pump cover 4, 2 bearing seats are respectively connected with the front pump cover 3 and the rear pump cover 4, and a shaft seal component is disposed in inner holes of the front pump cover 3 and the rear pump cover 4 to prevent the medium from leaking into the external environment.

The utility model discloses a single rotor displacement pump does not establish back pressure valve or relief valve, when taking place the superpressure, because compensating spring 6 predetermine elasticity, can produce a little clearance between gleitbretter 5 and the rotor profile face 201, the medium can be followed extrusion chamber 302 to inhaling chamber 301 pressure release to reach the safety protection effect.

The utility model discloses a theory of operation: as shown in fig. 8, the rotor 2 rotates in the counterclockwise direction and the 2-month tooth pump chamber 300 is filled with the medium. In fig. 8(a), the major axis of the rotor contour line is in a horizontal position, one of the pump chambers 300 is divided by the vane 5 into a suction chamber 301 and a discharge chamber 302, the suction chamber 301 is communicated with the pump inlet 102, the discharge chamber 302 is communicated with the pump outlet 103, and the other pump chamber 300 is located below the rotor 2 and is a closed chamber. As the rotor 2 rotates, the volume of the suction chamber 301 gradually increases, the pressure of the suction chamber 301 decreases, and the medium is continuously sucked from the pump inlet 102 and enters the suction chamber 301; the volume of the extrusion chamber 302 decreases gradually, the pressure of the extrusion chamber 302 increases, and the medium is extruded from the extrusion chamber 302 and discharged through the pump outlet 103. When the rotor 2 rotates 45 °, as shown in fig. 8(b), the volume of the suction chamber 301 is further enlarged, the volume of the extrusion chamber 302 is further reduced, the medium is continuously sucked into the suction chamber 301, the medium in the extrusion chamber 302 is continuously discharged, and the other closed pump chamber 300 rotates 45 ° counterclockwise from the lowermost position. When the rotor 2 continues to rotate 45 °, as shown in fig. 8(c), the volume of the suction chamber 301 becomes maximum and becomes the whole pump chamber 300, and at this time, the volume of the suction chamber 301 will not increase any more, it will become a new closed pump chamber 300, a new suction chamber 301 will appear, and the volume will increase from zero; the volume of the pumping chamber 302 becomes zero and the other pumping chamber 300 is now rotated to the position shown and becomes the new pumping chamber 302 with the largest volume. When the rotor 2 then rotates 45 °, as shown in fig. 8(d), a new suction chamber 301 has appeared, the volume gradually becomes larger, and the medium is sucked in continuously; the volume of the new pressing-out chamber 302 gradually decreases and the medium is continuously discharged. When the rotor 2 is rotated again through 45 °, the long axis of the rotor profile is again in a horizontal position, as shown in fig. 8 (a). In this way, the single-rotor positive displacement pump of the present invention realizes the continuous pumping and discharging of the medium.

The utility model belongs to a positive displacement pump works through the volume that changes the pump chamber, therefore it has stronger from inhaling the nature, also can regard as the air pump for pump drainage is gaseous.

The utility model discloses simple structure, easily design need not make the mould, and manufacturing cycle is short, and manufacturing cost is lower, and the part is less, and the reliability is high, and the life-span is longer.

Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; although the present invention has been described in detail with reference to the foregoing embodiments, it should be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; such modifications or substitutions do not depart from the scope of the invention in its corresponding aspects.

Claims (7)

1. The utility model provides a single rotor positive displacement pump, includes the pump body, rotor, preceding pump cover, back pump cover, gleitbretter and compensating spring, its characterized in that: the rotor is a single cylindrical rotor and is provided with a rotor profile surface, the profile line of the rotor profile surface is a standard ellipse or an approximate ellipse, the rotation axis of the rotor is the geometric central axis of the cylindrical body, and the rotor is provided with a rotor shaft hole on the rotation axis; the pump body is provided with a circular-hole-shaped pump body inner hole, the wall of the pump body is radially provided with a slide sheet groove, a pump inlet and a pump outlet, and the pump inlet and the pump outlet are respectively arranged on two sides of the slide sheet groove; the rotor is arranged in the inner hole of the pump body, the rotation axis of the rotor is superposed with the axis of the inner hole of the pump body, and the elliptical long axis of the contour line of the rotor is equal to the nominal size of the diameter of the inner hole of the pump body; the sliding sheet is arranged in the sliding sheet groove, 4 surfaces of the sliding sheet are respectively attached to 4 surfaces of the sliding sheet groove, so that the sealing and guiding effects are achieved, a spring seat is arranged above the sliding sheet groove, and the end part of the sliding sheet extends out of the inner hole of the pump body along the sliding sheet groove under the thrust action of the compensating spring and is in sliding fit with the profile surface of the rotor; a pump cavity in a shape of 2 crescent teeth is formed between the contour surface of the rotor and the inner hole of the pump body; the sliding sheet divides one pump cavity into a suction cavity and a pressing cavity, the suction cavity is communicated with the pump inlet, and the pressing cavity is communicated with the pump outlet;

the two sides of the pump body are respectively connected with the front pump cover and the rear pump cover, the front pump cover and the rear pump cover are respectively provided with a bearing cavity on the axis thereof, a bearing part is arranged in the bearing cavity, and a certain running clearance is kept between the end surfaces of the front pump cover and the rear pump cover and the two end surfaces of the rotor; the motor base and the motor are sequentially connected to the outer side of the rear pump cover, a pump shaft is arranged in the rotor shaft hole and connected with the shaft of the motor, a gland is arranged on one side of a bearing cavity of the rear pump cover, and the gland is connected with the pump shaft through a shaft seal component.

2. A single rotor positive displacement pump as claimed in claim 1, wherein: the sliding sheet is provided with a plurality of spring holes, the axis of each spring hole is parallel to the compensation direction of the sliding sheet, each compensation spring is a pressure spring and is arranged in the corresponding spring hole, and one end of each compensation spring is fixed to the corresponding spring seat.

3. A single rotor positive displacement pump as claimed in claim 1, wherein: the bearing component comprises a bearing body, a bearing sleeve and a round nut, the bearing component adopts medium self-lubrication, the bearing body is embedded in inner holes of the front pump cover and the rear pump cover, the bearing sleeve is sleeved on the pump shaft, and one end of the bearing sleeve is locked by the round nut; a disc is arranged at one end of the bearing sleeve, the inner side surface of the disc and one end surface of the bearing body are thrust surfaces, and a pair of thrust surfaces are mutually attached and bear axial thrust from the rotor; the inner hole surface of the bearing body and the outer circle surface of the bearing sleeve are mutually attached to bear the radial force from the rotor.

4. A single rotor positive displacement pump as claimed in claim 1, wherein: the rotor has two working modes of positive rotation and reverse rotation, and the pump inlet and the pump outlet are interchanged during the reverse rotation.

5. A single rotor positive displacement pump as claimed in claim 1, wherein: the single-rotor displacement pump is not provided with a back pressure valve or a safety valve, when overpressure occurs, a tiny gap is generated between the sliding sheet and the rotor contour surface due to the preset elasticity of the compensation spring, and a medium is decompressed from the extrusion cavity to the suction cavity, so that the safety protection effect is achieved.

6. A single rotor positive displacement pump as claimed in claim 1, wherein: the pump inlet and the pump outlet are both provided with a flow channel gradually changed from a square opening to a round opening, and the outer end of the flow channel is a round opening.

7. A single rotor positive displacement pump as claimed in claim 1, wherein: the shaft seal part is an oil seal or a mechanical seal.

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