Stator structure of screw pump and production process of stator structure

Abstract

The invention relates to a stator structure of a screw pump and a production process of the stator structure, the stator structure comprises a stator group, a first lantern ring, a sleeve and a fixing piece, and the sleeve sleeves the stator group; the stator group comprises a first stator, a second stator and at least one third stator, and the third stator is arranged between the first stator and the second stator; the first lantern rings are connected to the butt joint positions of the first stator, the second stator and the third stator in a sleeving mode. The fixing piece is connected to the first stator and the second stator, and the fixing piece is further matched with the sleeve. According to the invention, the first butt joint part, the second butt joint part or the third butt joint part with the plane and the curved surface are arranged at the end parts of the first stator, the second stator and the third stator, and the first butt joint part, the second butt joint part or the third butt joint part are fixed through the first lantern ring when being in butt joint with one another, so that the torsion resistance of the stator group is improved while positioning is carried out. And in addition, the fixing piece is used for pressing and fixing, so that the stability of the stator structure in long-term working is improved.

Description

Technical Field

[0001] The invention relates to the technical field of screw pumps, and in particular to a stator structure of a screw pump and a production process thereof. Background Art

[0002] The stator is a key component in a screw pump. Together with the rotor, it forms the main working unit of the screw pump. When the rotor rotates inside the stator, it transports the fluid from one end of the pump to the other. The design of the stator has an important influence on the performance of the screw pump. It not only affects the flow rate, pressure and efficiency of the pump, but also determines the type and conditions of fluids that the pump can handle.

[0003] Traditional stators are usually made of elastic materials such as rubber, elastomers or special synthetic materials, which have good wear resistance, corrosion resistance and sealing, but relatively weak torsion resistance. During the operation of the screw pump, the stator needs to withstand the rotational force from the rotor and the pressure of the fluid, especially when dealing with high viscosity or fluids containing solid particles, these forces will be greater. If the torsion resistance of the stator is not high, it is easy to deform or damage when running for a long time or under large torque, thus affecting the sealing performance and operation stability of the pump. Summary of the invention

[0004] In view of the above-mentioned shortcomings of the prior art, an object of the present invention is to provide a stator structure of a screw pump and a production process thereof, so as to solve one or more problems in the prior art.

[0005] To achieve the above object, the technical solution of the present invention is as follows: A stator structure of a screw pump, the stator structure comprising a stator group, a first sleeve, a sleeve and a fixing piece, the sleeve being sleeved on the stator group; the stator group comprising a first stator, a second stator and at least one third stator, the third stator being arranged between the first stator and the second stator; the first sleeve is sleeved on the joints between the first stator, the second stator and the third stator; the fixing piece is respectively connected to the first stator and the second stator, and the fixing piece is also matched with the sleeve.

[0006] Furthermore, the stator group includes a first hole, which passes through the first stator, the third stator and the second stator along the length direction of the stator group; a spiral line is arranged on the inner surface of the first hole, and the spiral line passes through the first stator, the third stator and the second stator in sequence.

[0007] Further, the first stator has a first docking portion and a second docking portion respectively arranged along the first hole opening at both ends; the second stator has the first docking portion and a third docking portion respectively arranged along the first hole opening at both ends; the third stator has the second docking portion and the third docking portion respectively arranged along the first hole opening at both ends.

[0008] Furthermore, the first docking portion, the second docking portion and the third docking portion are all annular symmetrical structures, and the end faces are all arranged concentrically with the first hole.

[0009] Furthermore, the annular surface of the first docking portion is formed by a first plane and a first curved surface arranged oppositely; the annular surface of the second docking portion is formed by a second plane and a second curved surface arranged oppositely; and the annular surface of the third docking portion is formed by a third plane and a third curved surface arranged oppositely.

[0010] Furthermore, the stator structure also includes a second ring, which is matched with the first docking portion and has one end abutting against the fixing member, and the outer ring surface of the second ring is coplanar with the outer ring surface of the stator assembly; the first hole passes through the second ring.

[0011] Furthermore, an annular protrusion is provided on the end surface of the second docking portion along the edge of the first hole, and the annular surface of the protrusion is formed by a fourth plane and a fourth curved surface that are arranged opposite to each other.

[0012] Furthermore, a first recessed portion is provided on the end face of the third docking portion, the first recessed portion is annularly symmetrical in shape and is concentric with the first hole, the annular surface of the first recessed portion is formed by a fifth plane and a fifth curved surface that are arranged oppositely, the fourth plane is matched with the fifth plane, and the fourth curved surface is matched with the fifth curved surface.

[0013] Furthermore, the concave surface of the first recessed portion is further provided with an annular second recessed portion which is concentric with the first hole, and the stator structure further comprises a sealing member which is provided in the second recessed portion.

[0014] Furthermore, the first ring is an annular structure, and the outer ring surface of the first ring is coplanar with the outer ring surface of the stator assembly; the inner ring surface of the first ring is formed by a sixth plane and a sixth curved surface arranged opposite to each other, the sixth plane is matched with the second plane and the third plane, and the sixth curved surface is matched with the second curved surface and the third curved surface.

[0015] Furthermore, the sixth plane also defines a second hole, the second hole passes through the first ring, and the sleeve also defines a third hole corresponding to the second hole; the stator structure also includes a latch, and the latch is disposed in the second hole and the third hole.

[0016] Furthermore, the fixing member includes a first part and a second part, the second part is arranged concentrically with the first part, and the sleeve is sleeved on the second part and abuts against the end surface of the first part.

[0017] A production process, which is applied to the stator structure of the above-mentioned screw pump, comprises the following steps: Processing the stator group into a first stator, a second stator and a third stator and marking them; Processing a spiral line on the inner surface of the first hole of the first stator, the second stator and the third stator according to the first docking portion, the second docking portion and the third docking portion; Assembling the first stator, the third stator and the second stator in sequence and combining the first collar, the second collar and the seal; Assembling a fixing member at one end of the first stator or the third stator; Assembling a fixing member at the other end of the first stator or the third stator; The assembly is completed by setting latches in the second hole and the third hole.

[0018] Compared with the prior art, the beneficial technical effects of the present invention are as follows: The present invention provides a stator group consisting of a first stator, a second stator and a third stator, and provides a first docking portion, a second docking portion or a third docking portion with a flat surface or a curved surface at the ends of the first stator, the second stator and the third stator. When the first docking portion, the second docking portion or the third docking portion are docked with each other, they are fixed by a first collar, thereby positioning and improving the torsion resistance of the stator group. In addition, fixing members are provided at both ends of the stator group for compression and fixing, thereby improving the stability of the stator structure under long-term operation. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 A structural schematic diagram of a stator structure of a screw pump and a production process thereof according to an embodiment of the present invention is shown.

[0020] Figure 2 A schematic structural diagram of a stator structure without a sleeve of a screw pump stator structure and a production process thereof according to an embodiment of the present invention is shown.

[0021] Figure 3 A structural schematic diagram of a stator group of a screw pump stator structure and a production process thereof according to an embodiment of the present invention is shown.

[0022] Figure 4 A schematic structural diagram of a sleeve showing a stator structure of a screw pump and a production process thereof according to an embodiment of the present invention.

[0023] Figure 5A structural schematic diagram of a first stator of a screw pump stator structure and a production process thereof according to an embodiment of the present invention is shown.

[0024] Figure 6 A structural schematic diagram of a third stator of a screw pump stator structure and a production process thereof according to an embodiment of the present invention is shown.

[0025] Figure 7 The third stator structure diagram shows a stator structure of a screw pump and its production process according to an embodiment of the present invention. Figure Ⅰ .

[0026] Figure 8 A schematic diagram of the structure of the second stator showing a stator structure of a screw pump and its production process according to an embodiment of the present invention Figure II .

[0027] Fig. 9 A schematic diagram of the structure of the second stator showing a stator structure of a screw pump and its production process according to an embodiment of the present invention Figure III .

[0028] Fig.10 A structural schematic diagram of a fixing part of a stator structure of a screw pump and a production process thereof according to an embodiment of the present invention is shown.

[0029] Fig.11 A structural schematic diagram of a first sleeve ring of a screw pump stator structure and a production process thereof according to an embodiment of the present invention is shown.

[0030] Fig.12 A structural schematic diagram of a second sleeve ring of a screw pump stator structure and a production process thereof according to an embodiment of the present invention is shown.

[0031] Fig.13 A partial structural enlarged view of the third docking portion of a stator structure of a screw pump and a production process thereof according to an embodiment of the present invention is shown.

[0032] Markings in the accompanying drawings: 1, stator assembly; 101, first stator; 102, second stator; 103, third stator; 104, first hole; 105, helix; 2, first ring; 201, sixth plane; 202, sixth curved surface; 203, second hole; 3, sleeve; 301, third hole; 4, fixing member; 401, first part; 402, second part; 5, first docking part; 501, first plane; 502 , first curved surface; 6, second docking portion; 601, second plane; 602, second curved surface; 603, protrusion; 6031, fourth plane; 6032, fourth curved surface; 7, third docking portion; 701, third plane; 702, third curved surface; 703, first recessed portion; 7031, fifth plane; 7032, fifth curved surface; 7033, second recessed portion; 8, sealing member; 9, second ring; 10, latch. DETAILED DESCRIPTION

[0033] In order to make the purpose, technical scheme and advantages of the present invention clearer, the following is a further detailed description of the stator structure of a screw pump and its production process proposed by the present invention in combination with the accompanying drawings and specific embodiments. According to the following description, the advantages and features of the present invention will be clearer. It should be noted that the accompanying drawings adopt a very simplified form and use non-precise proportions, which are only used to conveniently and clearly assist in explaining the purpose of the embodiments of the present invention. In order to make the purpose, features and advantages of the present invention more obvious and easy to understand, please refer to the accompanying drawings. It should be noted that the structure, proportion, size, etc. illustrated by the accompanying drawings of this specification are only used to match the content disclosed in the specification for people familiar with this technology to understand and read, and are not used to limit the limiting conditions for the implementation of the present invention, so they have no technical substantive significance. Any modification of the structure, change of the proportional relationship or adjustment of the size, without affecting the effect that the present invention can produce and the purpose that can be achieved, should still fall within the scope of the technical content disclosed by the present invention.

[0034] See also Figures 1 to 4 The stator structure of the screw pump of this embodiment includes a stator group 1, a first sleeve 2, a sleeve 3 and a fixing member 4, and the sleeve 3 is sleeved on the stator group 1. The stator group 1 includes a first stator 101, a second stator 102 and at least one third stator 103, and in this embodiment, there are five third stators 103, and the third stators 103 are arranged between the first stator 101 and the second stator 102. The first sleeve 2 is sleeved on the joints between the first stator 101, the second stator 102 and the third stator 103. The fixing member 4 is connected to the first stator 101 and the second stator 102 respectively, and the fixing member 4 is also matched with the sleeve 3.

[0035] Furthermore, the stator assembly 1 includes a first hole 104, such as Figure 4 As shown, the first hole 104 penetrates the first stator 101, the third stator 103 and the second stator 102 along the length direction of the stator group 1, and a spiral line 105 is arranged on the inner surface of the first hole 104, and the spiral line 105 penetrates the first stator 101, the third stator 103 and the second stator 102 in sequence.

[0036] Please continue reading Figures 5 to 9The first stator 101 has a first docking portion 5 and a second docking portion 6 at both ends along the opening of the first hole 104, the second stator 102 has a first docking portion 5 and a third docking portion 7 at both ends along the opening of the first hole 104, and the third stator 103 has a second docking portion 6 and a third docking portion 7 at both ends along the opening of the first hole 104.

[0037] Further, the first docking portion 5, the second docking portion 6 and the third docking portion 7 are all annular symmetrical structures, and the end faces are all arranged concentrically with the first hole 104. The annular surface of the first docking portion 5 is formed by a first plane 501 and a first curved surface 502 arranged oppositely, the annular surface of the second docking portion 6 is formed by a second plane 601 and a second curved surface 602 arranged oppositely, and the annular surface of the third docking portion 7 is formed by a third plane 701 and a third curved surface 702 arranged oppositely. The first docking portion 5, the second docking portion 6 and the third docking portion 7 can achieve an anti-torsion effect through the combination of planes and curved surfaces.

[0038] Furthermore, an annular protrusion 603 is provided on the end surface of the second docking portion 6 along the edge of the first hole 104 , and the annular surface of the protrusion 603 is formed by a fourth plane 6031 and a fourth curved surface 6032 which are arranged opposite to each other.

[0039] Furthermore, a first recessed portion 703 is provided on the end face of the third docking portion 7, the first recessed portion 703 is annularly symmetrical in shape and is concentric with the first hole 104, the annular surface of the first recessed portion 703 is formed by a fifth plane 7031 and a fifth curved surface 7032 that are arranged opposite to each other, the fourth plane 6031 is matched with the fifth plane 7031, and the fourth curved surface 6032 is matched with the fifth curved surface 7032.

[0040] For further information, please refer to Fig.13 The concave surface of the first recessed portion 703 is also provided with an annular second recessed portion 7033 which is concentric with the first hole 104. The stator structure also includes a sealing member 8 which is arranged in the second recessed portion 7033 and can achieve a sealing effect when the second docking portion 6 and the third docking portion 7 are docked.

[0041] Please continue reading Fig.11The first ring 2 is an annular structure, the outer ring surface of the first ring 2 is coplanar with the outer ring surface of the stator assembly 1, the inner ring surface of the first ring 2 is formed by a sixth plane 201 and a sixth curved surface 202 arranged opposite to each other, the sixth plane 201 is matched with the second plane 601 and the third plane 701, that is, the plane width of the sixth plane 201 is equal to the sum of the plane widths of the second plane 601 and the third plane 701, the sixth curved surface 202 is matched with the second curved surface 602 and the third curved surface 702, and similarly, the surface width of the sixth curved surface 202 is equal to the sum of the surface widths of the second curved surface 602 and the third curved surface 702.

[0042] Please continue reading Figure 1 , Figure 2 , Figure 4 and Fig.11 The sixth plane 201 also defines a second hole 203, and the second hole 203 penetrates the first ring 2. The sleeve 3 also defines a third hole 301 corresponding to the second hole 203. The stator structure also includes a latch 10, and the latch 10 is disposed in the second hole 203 and the third hole 301, thereby fixing the second docking portion 6 and the third docking portion 7 after docking.

[0043] Please continue reading Fig.12 The stator structure also includes a second ring 9, which is matched with the first docking portion 5 and one end of which abuts against the fixing member 4. The outer ring surface of the second ring 9 is coplanar with the outer ring surface of the stator assembly 1, and the first hole 104 passes through the second ring 9.

[0044] Please continue reading Figure 1 and Fig.10 The fixing member 4 includes a first portion 401 and a second portion 402, wherein the second portion 402 is arranged concentrically with the first portion 401, and the sleeve 3 is sleeved on the second portion 402 and abuts against the end surface of the first portion 401. The arrangement of the second portion 402 prevents the closed portion of the sleeve 3 and the fixing member 4 from being too close to the first stator 101 or the third stator 103, thereby ensuring the quality of the product.

[0045] The production process is applied to the stator structure of the above-mentioned screw pump, and the production process includes the following steps: First, the stator group 1 is processed into the first stator 101, the second stator 102 and the third stator 103 and marked. Then, the first docking portion 5, the second docking portion 6 and the third docking portion 7 are used to form a spiral line 105 on the inner surface of the first hole 104 of the first stator 101, the second stator 102 and the third stator 103. Then, the first stator 101, the third stator 103 and the second stator 102 are assembled in sequence and combined with the first collar 2, the second collar 9 and the seal 8. In the previous work, it is ensured that the spiral line 105 can still be continuous after the stator group 1 is assembled. Then, the fixing member 4 is assembled at one end of the first stator 101 or the third stator 103 and fixed by welding. Then, the fixing member 4 is assembled at the other end of the first stator 101 or the third stator 103, and is tightened and fixed by welding. Finally, the pin 10 is set in the second hole 203 and the third hole 301 to complete the assembly.

[0046] In the field of oil production equipment, the stator of a screw pump is usually several meters long, and the overly long structure has high requirements for processing equipment. For example, conventional CNC machining centers cannot accommodate the stator of a screw pump. The present invention creatively divides the stator into several sections, and processes the inner cavity spiral line 105 of each section separately. During processing, the positioning can be performed through the docking parts at both ends of each stator section, so that the spiral lines 105 of the inner cavities of two adjacent stator sections are continuous.

[0047] The technical features of the above-described embodiments can be combined arbitrarily. In order to make the description concise, all possible combinations of the technical features in the above-described embodiments are not described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification. The above-described embodiments only express several implementation methods of the present invention, and their descriptions are relatively specific and detailed, but they cannot be understood as limiting the scope of the invention patent. It should be pointed out that for ordinary technicians in this field, without departing from the concept of the present invention, several variations and improvements can be made, which all belong to the protection scope of the present invention. Therefore, the protection scope of the patent of the present invention shall be based on the attached claims.

Claims

1. A stator structure of a screw pump, characterized in that: The stator structure includes a stator group, a first ring, a sleeve and a fixing member, wherein the sleeve is sleeved on the stator group; the stator group includes a first stator, a second stator and at least one third stator, wherein the third stator is arranged between the first stator and the second stator; the first ring is sleeved on the joints between the first stator, the second stator and the third stator; the fixing member is respectively connected to the first stator and the second stator, and the fixing member is also matched with the sleeve.

2. A stator structure of a screw pump according to claim 1, characterized in that: The stator group includes a first hole, which passes through the first stator, the third stator and the second stator along the length direction of the stator group; a spiral line is arranged on the inner surface of the first hole, and the spiral line passes through the first stator, the third stator and the second stator in sequence.

3. A stator structure of a screw pump as claimed in claim 2, characterized in that: The first stator has a first docking portion and a second docking portion at both ends along the first hole opening, respectively; the second stator has the first docking portion and a third docking portion at both ends along the first hole opening, respectively; the third stator has the second docking portion and the third docking portion at both ends along the first hole opening, respectively.

4. A stator structure of a screw pump as claimed in claim 3, characterized in that: The first docking portion, the second docking portion and the third docking portion are all annular symmetrical structures, and the end faces are all arranged concentrically with the first hole.

5. A stator structure of a screw pump as claimed in claim 4, characterized in that: The first docking portion annular surface is formed by a first plane and a first curved surface that are arranged oppositely; the second docking portion annular surface is formed by a second plane and a second curved surface that are arranged oppositely; and the third docking portion annular surface is formed by a third plane and a third curved surface that are arranged oppositely.

6. A stator structure of a screw pump as claimed in claim 5, characterized in that: The stator structure also includes a second ring, which is matched with the first docking portion and has one end abutting against the fixing member. The outer ring surface of the second ring is coplanar with the outer ring surface of the stator assembly. The first hole passes through the second ring.

7. A stator structure of a screw pump according to claim 6, characterized in that: The end surface of the second docking portion is also provided with an annular protrusion along the edge of the first hole, and the annular surface of the protrusion is formed by a fourth plane and a fourth curved surface that are arranged oppositely.

8. A stator structure of a screw pump according to claim 7, characterized in that: A first recessed portion is arranged on the end face of the third docking portion. The first recessed portion is annularly symmetrical in shape and is concentric with the first hole. The annular surface of the first recessed portion is formed by a fifth plane and a fifth curved surface arranged opposite to each other. The fourth plane matches the fifth plane, and the fourth curved surface matches the fifth curved surface.

9. A stator structure of a screw pump as claimed in claim 8, characterized in that: The concave surface of the first recessed portion is further provided with an annular second recessed portion which is concentric with the first hole. The stator structure further includes a sealing member which is provided in the second recessed portion.

10. A stator structure of a screw pump according to claim 9, characterized in that: The first ring is an annular structure, and the outer ring surface of the first ring is coplanar with the outer ring surface of the stator assembly; the inner ring surface of the first ring is formed by a sixth plane and a sixth curved surface arranged opposite to each other, the sixth plane is matched with the second plane and the third plane, and the sixth curved surface is matched with the second curved surface and the third curved surface.

11. A stator structure of a screw pump according to claim 10, characterized in that: The sixth plane further defines a second hole, the second hole penetrates the first ring, and the sleeve further defines a third hole corresponding to the second hole; the stator structure further includes a latch, and the latch is disposed in the second hole and the third hole.

12. A stator structure of a screw pump according to claim 11, characterized in that: The fixing member comprises a first part and a second part, wherein the second part is arranged concentrically with the first part, and the sleeve is sleeved on the second part and abuts against an end surface of the first part.

13. A production process, the production process being applied to a stator structure of a screw pump as claimed in any one of claims 1 to 12, characterized in that: The production process comprises the following steps: Processing the stator group into a first stator, a second stator and a third stator and marking them; Processing a spiral line on the inner surface of the first hole of the first stator, the second stator and the third stator according to the first docking portion, the second docking portion and the third docking portion; Assembling the first stator, the third stator and the second stator in sequence and combining the first collar, the second collar and the seal; Assembling a fixing member at one end of the first stator or the third stator; A fixing piece is assembled at the other end of the first stator or the third stator; and a latch is arranged in the second hole and the third hole to complete the assembly.

Images