CN111622944A - Rotor and stator of a conical single-screw gas-liquid mixed pump - Google Patents

Abstract

The invention discloses a rotor and a stator of a conical single-screw gas-liquid mixed pump, comprising a conical rotor (1) and a conical stator (2); the conical rotor (1) and the conical stator (2) are connected from an inlet From the end face (I-I) to the outlet end face (III-III), the profile radius and eccentricity of each section are reduced linearly and conically with the geometric center of the section as the base point, and each section can achieve complete and correct meshing; the disclosed gas The liquid mixing pump not only increases the inlet flow of the single-screw gas-liquid mixing pump, but also increases the internal volume ratio, making the outlet pressure larger, and the scope of application and application field is wider; at the same time, when the gas-liquid ratio increases It can still effectively avoid the formation of gas plugs. Under the same outlet and inlet parameters, as the length of the screw decreases, the friction, wear and leakage are also reduced accordingly, and the life of the screw is longer.

Description

Rotor and stator of a conical single-screw gas-liquid mixed pump

technical field

The invention relates to a single-screw pump, in particular to a conical single-screw pump, in particular to a rotor and a stator of a conical single-screw gas-liquid mixed pump.

Background technique

The single-screw pump is a positive displacement rotor pump, which has the characteristics of strong adaptability of working medium, stable flow and convenient maintenance. It is widely used in agriculture, petroleum, chemical industry and food fields. The main working parts of a single screw pump are a pair of meshing screw rotors and stators. The characteristics of the screw rotor determine the performance of the single screw pump. Driven by the external power source, the helical interference fit of the two forms a continuous sealed cavity to realize the transmission process of the medium. The variation of the section and pitch of the single screw pump directly determines the characteristics of the screw rotor.

Chinese patent, bulletin number CN2037782U proposes a conical single-screw pump; its characteristics are: three forming methods of conical single-screw pump are proposed, namely, the diameter change of the rotor forming circle, the eccentricity change of the rotor forming circle and the Both change at the same time. By adjusting the working clearance of the conical screw rotor and the bushing stator, different meshing methods between the rotor and the stator can be realized, which expands the use range and service life of the single screw, but no specific tooth curve equation is given, the screw forming and difficult to manufacture.

SUMMARY OF THE INVENTION

In order to maximize the internal volume ratio of the single-screw pump, thereby increasing the outlet pressure of the single-screw pump, and increasing the inlet flow of the single-screw pump, the present invention provides a rotor for a conical single-screw gas-liquid mixed pump. with stator. From the inlet end face (I-I) to the outlet end face (III-III) of the conical rotor (1) and the conical stator (2) of the present invention, the profile radius and eccentricity of each section are linear cones based on the geometric center of the section The shape is reduced, and each section can achieve complete and correct meshing; in the case of an increased gas-liquid ratio, the formation of gas plugs can still be effectively avoided, and the transportation efficiency is higher. Under the same equivalent size, there is a larger volume at the suction end and a larger pressure at the discharge end, and the scope of application and application is wider; under the same outlet and inlet parameters, the axial length of the screw is greatly reduced , friction wear and leakage are also reduced accordingly, and the screw life is longer, which is of great significance to improve the comprehensive performance of the single screw pump.

In order to achieve the above object, the present invention adopts the following technical solutions:

A rotor and a stator of a conical single-screw gas-liquid mixed pump, comprising: a conical rotor (1) and a conical stator (2), and a cross-sectional profile at the inlet end face (I-I) of the conical rotor (1) is a circle with radius R and eccentricity E, the section profile at the outlet end face (III-III) of conical rotor (1) is a circle with radius r and eccentricity e;

The section profile at the inlet end face (I-I) of the conical stator (2) is formed by connecting 4 segments of curves in sequence, which are the first arc ABC, the first straight segment CD, the second arc DEF and the first arc. Two straight line segments FA, the radius of the two arcs are both R, and the length of the straight line segment is both 4E. , the third arc abc, the third straight segment cd, the fourth arc def and the fourth straight segment fa, the radius of the two arcs are r, and the length of the straight segment is 4e;

From the inlet end face (Ⅰ-Ⅰ) to the outlet end face (Ⅲ-Ⅲ) of the conical rotor (1) and the conical stator (2), the radius of the section profile and the eccentricity decrease linearly and conically with the geometric center of the section as the base point , satisfies R=αr, E=αe, α<1 is the section scaling factor;

Between the conical rotor (1) and the conical stator (2), the dynamic point planetary rotary motion with variable motion law is performed. The revolution and rotation angular speeds of the rotor on each section are equal, and the revolution and rotation radii are from the inlet end face (I-I) to the The outlet end face (III-III) decreases linearly in sequence, and at different cross-sectional positions, the rotor and the stator can achieve complete and correct meshing. The closed working chamber is closed, and the volume of the formed closed working chamber is gradually reduced.

A rotor and a stator of a conical single-screw gas-liquid mixed pump, from the inlet end face (I-I) to the outlet end face (III-III), the spiral expansion angle τ ₁ of the conical rotor (1) is continuous from 0 to 3π Variation: at the inlet end face (I-I), the helical expansion angle τ ₁ =0, at the middle axial section (II-II), the helical expansion angle τ ₁ =1.5π, at the outlet end face (III-III) , the spiral expansion angle τ ₁ =3π, with the spiral expansion angle τ ₁ from 0 to 3π, the tooth profile curve equation of the conical rotor (1) is:

where P ₁ (τ ₁ ) and H are the pitch and height of the conical rotor (1), respectively, τ ₀ is the angle parameter, 0≤τ ₀ ≤2π;

From the inlet end face (I-I) to the outlet end face (III-III), the spiral expansion angle τ2 of the conical stator ( ₂ ) changes continuously from 0 to 1.5π: at the inlet end surface (I-I), the spiral expansion angle τ ₂ =0, at the middle axial section (II-II), the helical expansion angle τ ₂ =0.75π, at the outlet end face (III-III), the helical expansion angle τ ₂ =1.5π, with the helical expansion angle τ ₂ is from 0 to 1.5π, the tooth curve equation of the circular arc segment of the tapered stator (2) is:

P₂(τ₂)为锥形定子(2)的螺距，且满足P₂(τ₂)＝2P₁(τ₁)；where τ ₃ is the angle parameter,

P ₂ (τ ₂ ) is the pitch of the tapered stator (2), and satisfies P ₂ (τ ₂ )=2P ₁ (τ ₁ );

The tooth curve equation of the straight line segment of the tapered stator (2) is:

In the formula, τ ₄ is the angle parameter, 0≤τ ₄ ≤π;

Disclosed is a rotor and a stator of a conical single-screw gas-liquid mixed pump. The helix L1 of the conical rotor ( ₁ ) is generated by _a counterclockwise spiral expansion of a generating circle O1 whose radius changes. _The equation of the helix L1 is:

The spiral line L ₂ of the conical stator (2) is generated by the counterclockwise spiral expansion of the occurrence circle O ₂ whose radius changes. The equation of the spiral line L ₂ is:

The beneficial effects of the present invention are:

①The rotor and stator of the proposed conical single-screw gas-liquid mixed pump, the section of the conical rotor (1) and the conical stator (2) from the inlet end face (Ⅰ-Ⅰ) to the outlet end face (Ⅲ-Ⅲ) Both the size and the eccentricity decrease linearly. Compared with the existing conical single-screw gas-liquid mixed infusion pump, under the same structural parameters, the internal volume ratio is significantly increased, the outlet pressure is higher, and the conical single-screw gas-liquid pump is widened. Application range of liquid mixing pump;

②The conical single-screw gas-liquid mixing pump with variable motion law can still effectively avoid the formation of gas plug when the gas-liquid ratio increases, thus ensuring the normal operation of the gas-liquid mixing pump;

③The length of the screw rotor and the stator determines the way of changing the pitch, which is beneficial to the design and processing of the screw rotor;

④ Under the same inlet and outlet parameters, the axial size of the screw is greatly reduced, the structure is more compact, the friction and leakage channels between the rotor and the stator are also reduced, and the life of the screw pump is longer;

⑤ By adjusting the working clearance of the conical screw rotor and the bushing stator, different meshing modes between the rotor and the stator can be realized, and the application field is wider.

Description of drawings

Figure 1 is a two-dimensional view of a conical rotor (1).

Figure 2 is a cross-sectional profile diagram at the inlet end face (I-I) of the conical rotor (1).

Fig. 3 is a cross-sectional profile diagram at the outlet end face (III-III) of the conical rotor (1).

Figure 4 is a two-dimensional cross-sectional view of the tapered stator (2).

Figure 5 is a cross-sectional profile diagram at the inlet end face (I-I) of the tapered stator (2).

Figure 6 is a cross-sectional profile diagram at the outlet end face (III-III) of the conical stator (2).

Figure 7 is a meshing diagram of the rotor section profile and the stator section profile at the inlet end face (I-I).

FIG. 8 is a meshing diagram of the rotor section profile and the stator section profile at the middle axial section (II-II).

Figure 9 is a meshing diagram of the rotor section profile and the stator section profile at the outlet end face (III-III).

Figure 10 is an assembly view of the conical rotor (1) in the conical stator (2).

In the figure: 1—conical rotor; 2—conical stator; L1—spiral of conical rotor ( ₁ ); L2—spiral of conical stator ( ₂ ); R—conical rotor (1) and The arc radius of the section profile at the inlet end face (I-I) of the conical stator (2); E—the eccentricity of the section profile at the inlet end face (I-I) of the conical rotor (1); r—the conical rotor (1) and the arc radius of the section profile at the outlet end face (Ⅲ-Ⅲ) of the conical stator (2); e—eccentricity of the section profile at the outlet end face (Ⅲ-Ⅲ) of the conical rotor (1); H - the height of the conical rotor (1); points O ₁ , O ₂ - are respectively the geometric center point and the center of rotation of the section profile of the conical rotor (1); O - the section profile of the conical stator (2) The rotation center point of the two rotation center points is the rotation center line of the screw rotor and the stator, respectively.

Detailed ways

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

As shown in Figure 1, it is a two-dimensional view of the conical rotor (1). From the inlet end face (I-I) to the outlet end face (III-III) of the conical rotor (1), the radius of the section profile and the eccentricity are both equal to The geometric center of the section is the base point and decreases linearly in a tapered manner, which satisfies R=αr, E=αe, and α<1 is the section scaling factor. The outer convex surface of the conical rotor (1) is a conical helical surface. From the inlet end face (I-I) to the outlet end face (III-III), the continuous linearly decreasing cross-sectional profile rotates around its center line, and the edge Generated by moving forward by pitch.

As the spiral expansion angle τ ₁ changes continuously from 0 to 3π, the tooth profile equation of the conical rotor (1) is:

where P ₁ (τ ₁ ) and H are the pitch and height of the conical rotor (1), respectively, τ ₀ is the angle parameter, 0≤τ ₀ ≤2π;

The spiral line L ₁ of the conical rotor (1) is generated by the counterclockwise spiral expansion of the occurrence circle O ₁ whose radius changes. The equation of the spiral line L ₁ is:

As shown in Figure 2, it is a cross-sectional profile diagram at the inlet end face (I-I) of the conical rotor (1). A circle with eccentricity E;

As shown in Figure 3, it is the cross-sectional profile at the outlet end face (III-III) of the conical rotor (1). A circle with eccentricity e;

As shown in Figure 4, it is a two-dimensional cross-sectional view of the conical stator (2). From the inlet end face (I-I) to the outlet end face (III-III) of the conical stator (2), the radius of the section profile and the eccentricity are the same. Taking the geometric center of the section as the base point, it decreases in a linear cone, satisfying R=αr, E=αe, and α<1 is the section scaling factor;

As the spiral expansion angle τ ₂ changes continuously from 0 to 1.5π, the tooth profile curve equation of the circular arc segment of the conical stator (2) is:

P₂(τ₂)为锥形定子(2)的螺距，且满足P₂(τ₂)＝2P₁(τ₁)；where τ ₃ is the angle parameter,

P ₂ (τ ₂ ) is the pitch of the tapered stator (2), and satisfies P ₂ (τ ₂ )=2P ₁ (τ ₁ );

The tooth curve equation of the straight line segment of the tapered stator (2) is:

In the formula, τ ₄ is the angle parameter, 0≤τ ₄ ≤π;

The spiral line L ₂ of the conical stator (2) is generated by the counterclockwise spiral expansion of the occurrence circle O ₂ whose radius changes. The equation of the spiral line L ₂ is:

As shown in Figure 5, it is the cross-sectional profile at the inlet end face (I-I) of the conical stator (2), the cross-sectional profile at the inlet end face (I-I) of the tapered stator (2) is followed by a 4-segment curve The first arc ABC, the first straight line segment CD, the second arc DEF and the second straight line segment FA, the two arc radii are both R, and the length of the straight line segment is 4E;

As shown in Figure 6, it is the cross-sectional profile at the outlet end face (III-III) of the conical stator (2). The second connection is formed, in order, the third arc abc, the third straight line segment cd, the fourth arc def and the fourth straight line segment fa, the radius of the two arcs is r, and the length of the straight line segment is 4e;

As shown in Figure 7, Figure 8 and Figure 9, the meshing diagram of the rotor section profile and the stator section profile at the inlet end face (I-I), the rotor section profile and the stator at the intermediate axial section (II-II), respectively Cross-sectional profile meshing diagram and rotor cross-sectional profile meshing diagram at the outlet end face (III-III) and stator cross-sectional profile meshing diagram, from the inlet end face (I-I) to the outlet end face (III-III), the conical rotor (1) The spiral expansion angle τ ₁ changes continuously from 0 to 3π. At the inlet end face (I-I), the spiral expansion angle τ ₁ =0, and at the middle axial section (II-II), the spiral expansion angle τ ₁ =1.5π , at the outlet end face (III-III), the helix expansion angle τ ₁ =3π; from the inlet end face (I-I) to the outlet end face (III-III), the helix expansion angle τ ₂ of the conical stator (2) varies from 0 Continuously changing to 1.5π, at the inlet end face (I-I), the spiral expansion angle τ ₂ =0, at the middle axial section (II-II), the spiral expansion angle τ ₂ =0.75π, at the outlet end face (III-II), the spiral expansion angle τ 2 =0.75π -III), the spiral expansion angle τ ₂ =1.5π, with the spiral expansion angle τ ₁ of the conical rotor (1) from 0 to 4π, and the spiral expansion angle of the conical stator (2) τ ₂ from 0 to 2π continuous The radius of the section profile and the eccentricity decrease linearly and conically based on the geometric center of the section, and the conical rotor (1) and the conical stator (2) can be properly meshed with each other.

As shown in Figure 10, it is the assembly diagram of the conical rotor (1) in the conical stator (2), including the conical rotor (1) and the conical stator (2). Under the fixed-point planetary rotation, the conical rotor A closed working cavity with continuously changing volume is formed between (1) and the conical stator (2), and the volume of the closed working cavity gradually decreases from the inlet end face (I-I) to the outlet end face (III-III).

Although the specific embodiments of the present invention have been described above in conjunction with the accompanying drawings, they do not limit the scope of protection of the present invention. Those skilled in the art should understand that on the basis of the technical solutions of the present invention, those skilled in the art do not need to pay creative work. Various modifications or deformations that can be made are still within the protection scope of the present invention.

Claims (4)

1. A rotor and a stator of a conical single-screw gas-liquid mixing pump, comprising: a conical rotor (1) and a conical stator (2), characterized in that: the inlet end face (I-I) of the conical rotor (1) ) is a circle with radius R and eccentricity E, and the section profile at the outlet end face (III-III) of conical rotor (1) is a circle with radius r and eccentricity e; The section profile at the inlet end face (I-I) of the conical stator (2) is formed by connecting 4 segments of curves in sequence, which are the first arc ABC, the first straight segment CD, the second arc DEF and the first arc. Two straight line segments FA, the radius of the two arcs are both R, and the length of the straight line segment is both 4E. , the third arc abc, the third straight segment cd, the fourth arc def and the fourth straight segment fa, the radius of the two arcs are r, and the length of the straight segment is 4e; The conical rotor (1) and the conical stator (2) from the inlet end face (I-I) to the outlet end face (III-III), the cross-sectional profile radius and eccentricity are both linear cones with the geometric center of the cross-section as the base point. The shape is reduced, and R=αr, E=αe, and α<1 is the section scaling factor; Between the conical rotor (1) and the conical stator (2), the dynamic point planetary motion with variable motion law is performed, the revolution and rotation angular velocities of the rotor on each section are equal, and the revolution and rotation radii start from the inlet end face (I- Ⅰ) It decreases linearly from the end face of the outlet (Ⅲ-Ⅲ) in turn. At different cross-sectional positions, the rotor and the stator can achieve complete and correct meshing, and the volume is formed from the end face of the inlet (Ⅰ-Ⅰ) to the end face of the outlet (Ⅲ-Ⅲ). Continuously changing closed working cavity, the volume of the closed working cavity formed gradually decreases. 2. The rotor and stator of a conical single-screw gas-liquid mixed pump according to claim 1, characterized in that: from the inlet end face (I-I) to the outlet end face (III-III), the conical rotor ( 1) The spiral expansion angle τ ₁ varies continuously from 0 to 3π: at the inlet end face (I-I), the spiral expansion angle τ ₁ =0, and at the middle axial section (II-II), the spiral expansion angle τ ₁ =1.5π, at the outlet end face (III-III), the spiral expansion angle τ ₁ =3π, as the spiral expansion angle τ ₁ changes from 0 to 3π, the tooth profile curve equation of the conical rotor (1) is:

where P ₁ (τ ₁ ) and H are the pitch and height of the conical rotor (1), respectively, τ ₀ is the angle parameter, 0≤τ ₀ ≤2π; From the inlet end face (I-I) to the outlet end face (III-III), the spiral expansion angle τ2 of the conical stator ( ₂ ) changes continuously from 0 to 1.5π: at the inlet end surface (I-I), the spiral expansion angle τ ₂ =0, at the middle axial section (II-II), the helical expansion angle τ ₂ =0.75π, at the outlet end face (III-III), the helical expansion angle τ ₂ =1.5π, with the helical expansion angle τ ₂ is from 0 to 1.5π, the tooth curve equation of the circular arc segment of the tapered stator (2) is:

where τ ₃ is the angle parameter,

P ₂ (τ ₂ ) is the pitch of the tapered stator (2), and satisfies P ₂ (τ ₂ )=2P ₁ (τ ₁ ); The tooth curve equation of the straight line segment of the tapered stator (2) is:

In the formula, τ ₄ is an angle parameter, and 0≤τ ₄ ≤π. 3. the rotor and the stator of a kind of conical single-screw gas-liquid mixing pump as claimed in claim 1, it is characterized in that: the helix L ₁ of the conical rotor ( ₁ ) is reversed by the generation circle O that the radius changes The hour-hand spiral expansion is generated, and the equation of the spiral line L ₁ is:

The spiral line L ₂ of the conical stator (2) is generated by the counterclockwise spiral expansion of the occurrence circle O ₂ whose radius changes. The equation of the spiral line L ₂ is:

4. A conical single-screw gas-liquid mixing pump, characterized in that: the conical rotor (1) and the conical stator (2) in claim 1 are used.

Images